JP2011159518A - Battery and method of manufacturing battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a battery and the like that are less likely to cause resistance variation in a current collecting terminal part and that an active material layer is difficult to peel off and that can be easily manufactured.
A lithium secondary battery includes a wound electrode body. The strip-shaped end portions 122m of the positive electrode metal foil current collector 122 of the positive electrode plate 121 constituting the wound electrode body 120 extend intermittently in the longitudinal direction and are adjacent to each other in the radial direction in the wound state. And a plurality of slit outer portions 122s that are positioned outside the slit 122h in the width direction and are adjacent to each other in the radial direction in a wound state. The positive electrode current collecting terminal portion 122y is formed so as to overlap each other.
[Selection] Figure 1

Description

  The present invention is a battery comprising a wound electrode body formed by laminating a long positive electrode plate and a long negative electrode plate with each other through a long separator and wound around an axis, and The present invention relates to a method for manufacturing this battery.

  Conventionally, a battery having a wound electrode body in which a long positive electrode plate and a long negative electrode plate are overlapped with each other via a long separator and wound around an axis is known. Yes. The positive electrode plate is composed of a positive electrode metal foil current collector and a positive electrode active material layer formed thereon, and the negative electrode plate is composed of a negative electrode metal foil current collector and a negative electrode active material layer formed thereon. Become. In such a battery, on one end side in the axial direction of the wound electrode body, a positive electrode band-shaped end portion that forms a band shape at the end in the width direction of the positive electrode metal foil current collector is protruded from the separator, The positive electrode belt-shaped end portion and the positive electrode external electrode member of the battery are electrically connected. Further, in this battery, the negative electrode band-shaped end portion which is located at the end in the width direction of the negative electrode metal foil current collector and is formed in a band shape on the other end side in the axial direction of the wound electrode body is protruded from the separator. The negative electrode belt-like end and the negative electrode external electrode member of the battery are electrically connected.

As a connection form between the positive electrode strip end portion (or negative electrode strip end portion) and the positive electrode external electrode member (or negative electrode external electrode member), the following is known.
As a first conventional technique, there is a battery 910 whose main part is shown in FIG. That is, the battery 910 includes the wound electrode body 911 having the above-described configuration wound around the axis BX. A large number of strip-like current collecting tabs 915, 915,... Are joined to the strip-shaped end portion 913 of the wound electrode body 911. The battery 910 has a rod-like lead terminal 917 that is electrically connected to an external electrode member (not shown).

  The current collecting tabs 915, 915,... And the lead terminals 917 are connected by laser welding or resistance welding. Specifically, as shown in FIG. 21, the current collecting tabs 915, 915,... Adjacent to each other in the radial direction are joined to each other by, for example, three welds 919, as shown in FIG. The current collecting tab 915 located on the inner side and the current collecting tab 915 located on the outer side in the radial direction are laser-welded to the lead terminal 917. As a result, all the current collecting tabs 915, 915,... Are connected to each other, and the current collecting tabs 915, 915,.

Further, as a second conventional technique, there is a battery 920 whose main part is shown in FIG. That is, in the battery 920, a number of current collecting tabs 915, 915,... Are joined to the wound electrode body 911, as in the prior art 1 described above. The battery 920 has the lead terminal 917 described above. In the battery 920, the current collecting tabs 915, 915,... And the lead terminal 917 are connected by tagging using a metal belt 921. Specifically, as shown in FIG. 22, all the current collecting tabs 915, 915,... Are connected to each other by bundling all the current collecting tabs 915, 915,. .. And the current collecting tabs 915, 915,... And the lead terminals 917 are connected.
In addition to the batteries 910 and 920 shown in FIG. 21 and FIG. 22, the following Patent Documents 1 and 2 are given as conventional techniques related to a battery in which a current collecting tab is connected to a wound electrode body. .

JP-A-11-162521 JP 2009-181812 A

  However, in the prior art 1 (see FIG. 21), if the number of current collecting tabs 915, 915,... That can be welded at once is increased by increasing the laser output, the current collecting tabs 915, 915 adjacent in the radial direction are used. In a portion where the number of... Is small, problems such as holes in the current collecting tabs 915, 915,. This problem similarly occurs even when resistance welding is performed. Therefore, the number of current collecting tabs 915, 915,... To be welded at a time is reduced by suppressing the laser output (three in this example as described above), and the welds 919, 919,. As described above, all the current collecting tabs 915, 915,... Are joined to the lead terminals 917. Therefore, the number of welds 919, 919,. In addition, if the number of current collecting tabs 915, 915,... Is reduced in order to reduce the welded portions 91, 919,.

  In the prior art 2 (see FIG. 22), when the length of the current collecting tab 915 is short, the length Hk parallel to the axis BX of the current collecting tab 915 located on the outermost periphery is reduced, and the metal belt 921 is strip-shaped. In order to easily come off from the end portion 913, it is necessary to increase the length Hk parallel to the axis BX of the current collecting tab 915 located on the outermost periphery to some extent. For this reason, there is a problem in that the dimension of the connecting portion between the current collecting tabs 915, 915,...

  Therefore, a battery 940 whose main part is shown in FIGS. 23 and 24 has been devised as a battery having a different form from the prior arts 1 and 2. That is, the battery 940 according to this reference embodiment has the above-described wound electrode body 911. In the wound electrode body 911, the band-shaped end portions 913 shown in FIG. The current collecting terminal portion 941 shown in FIG. The current collecting terminal portion 941 is electrically connected to a lid member as an external electrode member through a lead wire (not shown).

  Since the battery 940 in such a form does not have the current collecting tabs 915, 915,... Like the conventional forms 1 and 2, the above-described problems that occur when the current collecting tabs 915, 915,. By providing the current collecting tabs 905, 905,..., The above-described high cost can be eliminated. However, in the battery 940, the contact between the strip-shaped end portions 913 is not constant in the current collecting terminal portion 941, and resistance variation tends to occur in the current collecting terminal portion 941. Further, when the current collecting terminal portion 941 is formed by gathering the band-shaped end portions 913 together, the wound electrode body 911 is likely to be wrinkled, and the active material layer may be partially peeled off.

  The present invention has been made in view of such a current situation, and it is difficult to produce resistance variation in the current collecting terminal part, and the active material layer is not easily peeled off, and a battery that is easy to manufacture and a method for manufacturing the battery. The purpose is to provide.

  One embodiment of the present invention for solving the above problems is a positive metal foil current collector, a long positive electrode plate having a positive electrode active material layer formed on the positive metal foil current collector, and a negative metal A foil current collector and a long negative electrode plate having a negative electrode active material layer formed on the negative metal foil current collector are overlapped with each other via a long separator and wound around an axis. In the wound electrode body, on one end side in the axial direction, the strip-shaped end portion that is exposed and located at the end in the width direction of the positive electrode metal foil current collector has a spiral shape, From the separator, the strip-shaped end portion that is exposed and located at the end in the width direction of the negative electrode metal foil current collector forms a spiral shape on the other end side in the axial direction and protrudes from the separator. A battery comprising a wound-type electrode body that protrudes, the strip of the positive electrode metal foil current collector And at least one of the strip-shaped end portions of the negative electrode metal foil current collector, the strip-shaped end portions extend intermittently in the longitudinal direction and are adjacent to each other in the radial direction in a wound state. Among the strip-shaped end portions, a plurality of slit outer portions that are located on the outer side in the width direction than the slits and that are adjacent to each other in the radial direction in a wound state are gathered and overlapped with each other. It is a battery which comprises a current collection terminal part.

  In this battery, as described above, among the strip-shaped end portions of the metal foil current collector constituting the electrode plate, the slit outer portions are gathered together and overlap each other to constitute a current collecting terminal portion. Therefore, as in the prior arts 1 and 2 (see FIGS. 21 and 22), a large number of current collecting tabs are connected to the belt-shaped end portions, and these current collecting tabs are welded together or are tightened. Thus, the wound electrode body and the battery can be reduced in size. Further, there is no possibility that the above-described current collection efficiency that occurs when the number of current collection tabs is reduced is lowered. Furthermore, it is not necessary to connect a current collecting tab, and since the current collecting terminal portion can be easily formed, the battery can be made inexpensive.

Further, as in the reference embodiment (see FIGS. 23 and 24), when the current collecting terminal portion is formed by gathering the belt-like end portions without providing the slits at the belt-like end portions, as described above, Resistance variation tends to occur in the electric terminal portion. However, in this battery, since the above-described slit is provided at the belt-like end portion, resistance variation hardly occurs in the current collecting terminal portions that are gathered together and overlapped with each other. In addition, since the above-described slit is formed, when forming the current collecting terminal portion, it is difficult to affect the inner part in the width direction (axial direction) than the slit in the wound electrode body. The problem that the active material layer peels off in the positive electrode plate and the negative electrode plate can be prevented.
As described above, the “slit” has a form extending in the longitudinal direction, but is not limited to a straight line. For example, the end of the slit may be a U shape extending in the width direction or a wavy shape.

  Furthermore, it is preferable that the battery has the current collecting terminal portion in each of the positive electrode metal foil current collector and the negative electrode metal foil current collector.

  In this battery, since each of the positive electrode metal foil current collector of the positive electrode plate and the negative electrode metal foil current collector of the negative electrode plate has the above-described current collecting terminal portion, in each of the positive electrode plate and the negative electrode plate, The above-described effects can be obtained, and the battery is more reliable and easy to manufacture.

  Furthermore, in the battery according to any one of the above, the band-shaped end portion is positioned on the inner side in the axial direction with respect to the slit, and the current collecting terminal portion is configured by gathering the outer portion of the slit. And a conductive conductive member having an exposed portion exposed outside in the axial direction and electrically connected to the strip-shaped end portion, and is in contact with the current collecting terminal portion from a direction orthogonal to the axial line. A first connecting portion electrically connected to the current collecting terminal portion, and electrically connected to the first connecting portion, contacting the exposed portion from the outside in the axial direction, and electrically connected to the exposed portion. The battery may further include a conductive member having a second connection portion.

  In this battery, a conductive member having a first connection portion and a second connection portion is used, and the conductive member and the electric member are not only in the current collector terminal portion but also in the exposed portion of the strip-shaped end portion of the metal foil current collector. Connected. For this reason, since the strip | belt-shaped edge part of metal foil electrical power collector and a conductive member can be connected by low resistance, a positive potential and a negative potential can be taken out with low resistance through this conductive member.

In addition, as a connection method between the first connection portion and the current collecting terminal portion of the conductive member, for example, a method of bonding the two together by welding, a method of bonding the two together using solder or a conductive adhesive, rivet And a method of connecting them to each other using bolts and nuts, a method of connecting them to each other using a metal belt, and the like.
In addition, as a method of connecting the second connecting portion and the exposed portion of the conductive member, for example, a method of bonding the two together by welding, a method of bonding the two together using solder or a conductive adhesive, the above-described axis For example, a method of connecting the two only by contact from the outside in the direction can be given.

  And a battery case body having an opening and accommodating the wound electrode body; and an external electrode member for closing the opening of the battery case body and forming an external electrode of the battery And the conductive member extends from the first connection portion, contacts the external electrode member, and has a third connection portion that is electrically connected to the external electrode member. good.

  In this battery, since the conductive member further includes the above-described third connection portion, the strip-shaped end portion (the current collecting terminal portion or the current collecting terminal portion and the exposed portion) of the electrode plate and the external electrode member are connected only by this conductive member. Can be electrically connected. For this reason, it is not necessary to use a lead wire or the like for connection between the conductive member and the external electrode member, and the battery can be made inexpensive.

  In another aspect, a positive metal foil current collector, a long positive electrode plate having a positive electrode active material layer formed on the positive metal foil current collector, a negative metal foil current collector, and the negative electrode This is a wound electrode body in which a long negative electrode plate having a negative electrode active material layer formed on a metal foil current collector is overlapped with each other through a long separator and wound around an axis. The strip-shaped end portion of the positive electrode metal foil current collector that is located at the end in the width direction and is exposed and forms a strip shape spirally and protrudes from the separator on one end side in the axial direction. On the other end side in the axial direction, a wound-type electrode in which the strip-shaped end portion of the negative electrode metal foil current collector located at the end in the width direction and exposed to form a strip shape spirals and protrudes from the separator A strip-shaped end portion of the positive electrode metal foil current collector and a strip-shaped end portion of the negative electrode metal foil current collector Among them, at least one strip-shaped end portion intermittently extends in the longitudinal direction thereof and has a plurality of slits adjacent to each other in the radial direction in a wound state. And a battery manufacturing method in which a plurality of slit outer portions adjacent to each other in the radial direction in a wound state are gathered together and overlap each other to constitute a current collecting terminal portion. A winding step in which the positive electrode plate and the negative electrode plate are wound around the axis while being overlapped with each other via the separator, and the belt-like shape of the positive electrode metal foil current collector on the one end side A winding step in which an end protrudes, a band-like end of the negative electrode metal foil current collector protrudes on the other end side, and the slits are wound adjacent to each other in the radial direction; Prior to the turning process, the strip ends are A slit forming step for forming a power strip, and, after the winding step, a current collecting terminal portion forming step for forming the current collecting terminal portion by stacking the slit outer portions together and overlapping each other, A method for producing a battery comprising:

  In manufacturing the above-described battery, in order to form the above-described slit, first, the positive electrode plate and the negative electrode plate are overlapped with each other via a separator and wound around the axis, and then the wound electrode body is formed. A method of forming a slit at the belt-shaped end can be considered. However, in this method, chips generated when forming the slit remain in the wound electrode body, and the chips may cause a short circuit between the positive electrode plate and the negative electrode plate.

  On the other hand, in the battery manufacturing method described above, slits are formed at the belt-shaped end portions in the slit forming step prior to the winding step in which the positive electrode plate and the negative electrode plate are wound with a separator interposed therebetween. In this way, the chips generated when forming the slit can be easily removed, so that when the wound electrode body is formed thereafter, the chips are mixed into the wound electrode body. Can be prevented. Therefore, a highly reliable battery can be manufactured.

It is a longitudinal cross-sectional view of the lithium secondary battery which concerns on embodiment. FIG. 4 is a perspective view showing a wound electrode body and first and second conductive plates connected thereto according to the embodiment. 1 is a perspective view showing a wound electrode body according to an embodiment. It is a top view which concerns on embodiment and shows a positive electrode plate. It is a top view which concerns on embodiment and shows a negative electrode plate. It is a top view which concerns on embodiment and shows a separator. It is explanatory drawing which shows a mode that a positive electrode plate is formed regarding the manufacturing method of the lithium secondary battery which concerns on embodiment. It is a perspective view which shows the state which wound the positive electrode board and the negative electrode board around the axis line via the separator regarding the manufacturing method of the lithium secondary battery which concerns on embodiment. FIG. 9 is a plan view of the wound electrode body of FIG. 8 as viewed from above in FIG. 8 with respect to the method for manufacturing a lithium secondary battery according to the embodiment. It is a perspective view which shows the state which formed the positive electrode current collection terminal part and the negative electrode current collection terminal part in the winding type electrode body regarding the manufacturing method of the lithium secondary battery which concerns on embodiment. It is the top view which looked at the winding type electrode body of FIG. 10 from the upper direction of FIG. 10 regarding the manufacturing method of the lithium secondary battery which concerns on embodiment. It is a perspective view which shows the form of a 1st electroconductive plate and a lead member regarding the manufacturing method of the lithium secondary battery which concerns on embodiment. It is a perspective view which shows the state which welded the 1st electroconductive plate and the lead member regarding the manufacturing method of the lithium secondary battery which concerns on embodiment. It is a perspective view which shows the state which connected the 1st electroconductive plate, the lead member, and the 2nd electroconductive plate to the winding type electrode body regarding the manufacturing method of the lithium secondary battery which concerns on embodiment. It is a perspective view which shows the state which connected the 2nd cover member to the winding type electrode body etc. of FIG. 14 regarding the manufacturing method of the lithium secondary battery which concerns on embodiment. FIG. 16 is a perspective view showing a state in which the wound electrode body of FIG. 15 is inserted into the battery case body and the second lid member is crimped and fixed to the battery case body with respect to the method for manufacturing the lithium secondary battery according to the embodiment. is there. It is a perspective view which shows the state which connected the 1st cover member to the lead member regarding the manufacturing method of the lithium secondary battery which concerns on embodiment. It is a perspective view which shows the form of a spacer regarding the manufacturing method of the lithium secondary battery which concerns on embodiment. It is a cross-sectional view which shows the state which has arrange | positioned the spacer in the battery case main body regarding the manufacturing method of the lithium secondary battery which concerns on embodiment. It is a perspective view which shows the state which crimped and fixed the 1st cover member to the battery case main body regarding the manufacturing method of the lithium secondary battery which concerns on embodiment. FIG. 6 is an explanatory diagram showing a main part of a battery according to prior art 1. FIG. 10 is an explanatory diagram showing a main part of a battery according to prior art 2. It is explanatory drawing which shows the winding type electrode body which wound the positive electrode board and the negative electrode board through the separator regarding the battery which concerns on a reference technique. It is explanatory drawing which shows the state which formed the current collection terminal part in the wound type electrode body regarding the battery which concerns on a reference technique.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a lithium secondary battery (battery) 100 according to this embodiment. 2 shows a wound electrode body 120 constituting the lithium secondary battery 100, and first and second conductive plates (conductive members) 151, 161 connected thereto, and FIG. A wound electrode body 120 is shown. Further, the positive electrode plate 121 constituting the wound electrode body 120 is shown in FIG. 4, the negative electrode plate 131 is shown in FIG. 5, and the separator 141 is shown in FIG.

  The lithium secondary battery 100 is a cylindrical battery and is used as a power source for a hybrid car, an electric vehicle, and the like. The lithium secondary battery 100 includes a battery case 110, a wound electrode body 120 accommodated in the battery case 110, first and second conductive plates 151, 161 connected to the wound electrode body 120, and leads. It is comprised from the member 155 grade | etc.,. In addition, an electrolyte solution (not shown) is injected into the battery case 110 and sealed.

  The battery case 110 has a cylindrical shape (specifically, a cylindrical shape) extending in the direction of the axis AX, and a battery case main body 111 in which the wound electrode body 120 is disposed inside, and openings 111h1 at both ends of the battery case main body 111. , 111h2 each having a first lid member 113 and a second lid member 115 having a circular shape in plan view (see FIGS. 1, 20, etc.). Battery case body 111, first lid member 113, and second lid member 115 are each formed of metal.

The first lid member 113 is also a positive external electrode member that forms a positive external electrode of the battery, and is electrically connected to a positive electrode plate 121 described later. The second lid member 115 is also a negative external electrode member that forms a negative external electrode of the battery, and is electrically connected to a negative electrode plate 131 described later.
The first lid member 113 includes a disc-shaped lid main body portion 113e and a columnar terminal portion 113f that stands up at the center of the lid main body portion 113e and extends outward in the axis AX direction (upward in FIG. 1). Become. The lid main body 113e is provided with an electrolyte inlet 113eh for injecting an electrolyte into the battery case 110. The electrolytic solution inlet 113eh is closed by a plug 118.
The second lid member 115 includes a disc-shaped lid body portion 115e and a columnar terminal portion 115f that stands upright at the center of the lid body portion 115e and extends outward in the axis AX direction (downward in FIG. 1). It consists of.

  A ring-shaped first gasket 117 is disposed between the first lid member 113 and one end 111c1 (upward in FIG. 1) of the battery case body 111 in the axis AX direction. The battery case 110 is sealed while being electrically insulated from the battery case body 111. A ring-shaped second gasket 119 is also disposed between the second lid member 115 and the other end portion 111c2 (downward in FIG. 1) of the battery case body 111 in the axis AX direction. The battery case 110 is sealed while electrically insulating the battery case 115 and the battery case body 111.

  Between the battery case 110 and a wound electrode body 120, which will be described later, in order to hold the wound electrode body 120 at a predetermined position in the battery case 110, two backlash preventing spacers 171 and 171 are provided. Are arranged at equal intervals in the circumferential direction (see FIGS. 1, 18, 19 and the like). Specifically, the spacer 171 includes a plate-like first spacer portion 171a and a second spacer portion 171b connected thereto (see FIG. 18). Among these, the first spacer portion 171a is in contact with the second connection portion 151b of the first conductive plate 151 connected to the wound electrode body 120 from the outside in the axis AX direction (upward in FIG. 1). The second spacer portion 171b is interposed between the case body member 111 and the wound electrode body 120, and prevents the wound electrode body 120 from moving in a direction orthogonal to the axis AX.

  Next, the wound electrode body 120 will be described in detail (see FIGS. 1 to 6 and the like). The wound electrode body 120 includes a long positive electrode plate 121 (see FIG. 4) and a long negative electrode plate 131 (see FIG. 5), a long separator 141 having air permeability. (See FIG. 6), and they are overlapped with each other via a plurality of times and wound around the axis AX in a cylindrical shape. One end side of the wound electrode body 120 in the axis AX direction (upward in FIGS. 1 to 3) is located at the end in the width direction of the positive electrode metal foil current collector 122 of the positive electrode plate 121 and is exposed. A strip-shaped positive electrode strip-shaped end portion 122 m is spirally projected from the separator 141. On the other hand, the other end side (downward in FIGS. 1 to 3) of the wound electrode body 120 in the axis AX direction is located at the end in the width direction of the negative electrode metal foil current collector 132 of the negative electrode plate 131. The negative electrode strip-shaped end portion 132m that is exposed and forms a strip shape is spirally projected from the separator 141.

  Among these, the positive electrode plate 121 has a positive electrode metal foil current collector 122 made of an aluminum foil as a core material, as shown in FIG. Among the surfaces (both sides) of the positive electrode metal foil current collector 122, the positive electrode coating part 122w in the center in the width direction (vertical direction in FIG. 4) has a positive electrode active material containing a positive electrode active material such as lithium cobalt composite oxide. The material layer 123 is formed in a strip shape in the longitudinal direction (left-right direction in FIG. 4). Accordingly, one end side in the width direction (upper side in FIG. 4) of the positive electrode metal foil current collector 122 is exposed without the positive electrode active material layer 123 and the longitudinal length of the positive electrode metal foil current collector 122 is exposed. It becomes the 1st positive electrode uncoated part 122m extended in a strip | belt shape in the direction. Further, among the positive electrode metal foil current collector 122, the other end side in the width direction (lower side in FIG. 4) also exposes this positive electrode metal foil current collector 122 without the presence of the positive electrode active material layer 123, and the longitudinal direction. The second positive electrode uncoated part 122n is narrower than the first positive electrode uncoated part 122m. Among these, the first positive electrode uncoated portion 122m is the above-described positive electrode belt-shaped end portion 122m that protrudes from the separator 141 in the axis AX direction in the wound electrode body 120.

A number of positive electrode slits 122h, 122h,... Extending intermittently in the longitudinal direction are formed in the first positive electrode uncoated portion (positive electrode strip end portion) 122m. These positive electrode slits 122h, 122h,... Are arranged in two lines alternately in a state where the positive electrode plate 121 is wound as a wound electrode body 120, and are arranged almost line-symmetrically when viewed from the axis AX direction. The positive electrode slits 122h, 122h,... Of each group are adjacent to each other in the radial direction (see FIGS. 1 to 3, 8, and 9).
In addition, among the positive electrode strip-shaped end portions 122m, a large number of positive electrode slit outer portions 122s, 122s,... Positioned on the outer side in the width direction (upward in FIG. 4) than the positive electrode slits 122h, 122h,. Are wound as the wound electrode body 120 and are alternately divided into two groups, arranged substantially symmetrically with respect to the axis AX, and the positive electrode slit outer portions 122s, 122s,. Are adjacent to each other in the radial direction (see FIGS. 1 to 3, 8, and 9).

Moreover, as shown in FIG. 4, two through-holes 122sc and 122sc are formed in the positive electrode slit outer side portions 122s, 122s,. These through holes 122sc, 122sc,... Are divided into two groups two by two in a state where the positive electrode plate 121 is wound as the wound electrode body 120, and are substantially line-shaped when viewed from the direction of the axis AX. The through holes 122sc and 122sc of each group are arranged symmetrically and are adjacent to each other in the radial direction (see FIGS. 1 to 3, FIG. 8, etc.).
And these positive electrode slit outer side parts 122s, 122s, ... gather together and overlap each other, thereby constituting a positive electrode current collecting terminal part 122y whose section perpendicular to the axis AX is H-shaped.

  As shown in FIG. 5, the negative electrode plate 131 includes a negative electrode metal foil current collector 132 made of a copper foil as a core material. Of the surface (both sides) of the negative electrode metal foil current collector 132, the negative electrode coating portion 132 w at the center in the width direction (vertical direction in FIG. 5) has a negative electrode active material layer 133 containing a negative electrode active material such as natural graphite. Is formed in a strip shape in the longitudinal direction (left-right direction in FIG. 5). Accordingly, one end side in the width direction (downward in FIG. 5) of the negative electrode metal foil current collector 132 is exposed without the negative electrode active material layer 133 being present, and is elongated. It becomes the 1st negative electrode uncoated part 132m extended in a strip | belt shape in the direction. Further, among the negative electrode metal foil current collector 132, the other end side in the width direction (upward in FIG. 5) is also exposed in the longitudinal direction without the negative electrode active material layer 133 being exposed. The second negative electrode uncoated portion 132n is narrower than the first negative electrode uncoated portion 132m. Among these, the 1st negative electrode uncoated part 132m is the above-mentioned negative electrode strip | belt-shaped edge part 132m which protrudes in the axis line AX direction from the separator 141 in the wound electrode body 120. FIG.

A number of negative electrode slits 132h, 132h,... Extending intermittently in the longitudinal direction are formed in the first negative electrode uncoated portion (negative electrode strip-shaped end portion) 132m. These negative slits 132h, 132h,... Are alternately divided into two groups in a state in which the negative electrode plate 131 is wound as the wound electrode body 120, and are arranged almost line-symmetrically when viewed from the axis AX direction. The negative electrode slits 132h, 132h,... Of each group are adjacent to each other in the radial direction (see FIGS. 1 to 3, 8, and 9).
In addition, among the negative electrode belt-shaped end portions 132m, a large number of negative electrode slit outer portions 132s, 132s,... Located on the outer side in the width direction (lower in FIG. 5) than the negative electrode slits 132h, 132h,. Are wound as the wound electrode body 120, and are alternately divided into two groups and arranged substantially symmetrically when viewed from the axis AX direction. The negative electrode slit outer portions 132s, 132s,. Are adjacent to each other in the radial direction (see FIGS. 1 to 3, 8, and 9).

Moreover, as shown in FIG. 5, two through holes 132sc and 132sc are formed in the negative electrode slit outer side portions 132s, 132s,. These through holes 132sc, 132sc,... Are divided into two groups alternately two by two in a state in which the negative electrode plate 131 is wound as the wound electrode body 120, and are substantially lines as viewed from the direction of the axis AX. The through holes 132sc and 132sc of each group are arranged symmetrically and are adjacent to each other in the radial direction (see FIGS. 1 to 3, FIG. 8, etc.).
And these negative electrode slit outer side parts 132s, 132s, ... gather together and overlap each other, thereby constituting a negative electrode current collecting terminal part 132y having a H-shaped cross section perpendicular to the axis AX.

Two first conductive plates 151, 151 made of aluminum and one lead member 155 are connected to the positive electrode current collecting terminal portion 122y (see FIGS. 1, 2, 12, 13, etc.).
The first conductive plate 151 has an L shape having a plate-like first connection portion 151a and a plate-like second connection portion 151b that is continuous with the first connection portion 151a and orthogonal to the first connection portion 151a. . Among these, the 1st connection part 151a is provided with the through-holes 151ah and 151ah corresponding to the through-holes 122sc and 122sc of the positive electrode current collection terminal part 122y (refer FIG. 12).

  The lead member 155 includes a rectangular plate-shaped first lead portion 155a, a rectangular plate-shaped third lead portion 155c, and a long and narrow second lead portion 155b connecting them. Among these, the first lead portion 155a is provided with through holes 155ah and 155ah corresponding to the through holes 122sc and 122sc of the positive electrode current collecting terminal portion 122y and the through holes 151ah and 151ah of the first conductive plate 151 (FIG. 12). reference).

  The first conductive plate 151 and the lead member 155 are configured such that the first connection portion 151a of the first conductive plate 151 and the first lead portion 155a of the lead member 155 overlap each other, and the through holes 151ah and 151ah of the first connection portion 151a The first lead portions 155a are welded to each other with the through holes 155ah and 155ah communicating with each other (see FIGS. 2, 13 and the like). In FIG. 2 and FIG. 13 and the like, the welding locations are indicated by “x” marks.

Then, the first connecting portion 151a of the first conductive plate 151 and the first lead portion 155a of the lead member 155 are brought into contact with and electrically connected to the positive electrode current collecting terminal portion 122y from the direction orthogonal to the axis AX. ing. Further, the other first conductive plate 151 also has a first connecting portion 151a that is in contact with and electrically connected to the positive electrode current collecting terminal portion 122y from a direction orthogonal to the axis AX.
Specifically, the axis line AX is between the first connection portion 151a of one first conductive plate 151 and the first lead portion 155a of the lead member 155 and the first connection portion 151a of the other first conductive plate 151. The positive electrode current collector terminal portion 122y is sandwiched from the direction orthogonal to the vertical axis. In this state, the through holes 151ah, 151ah,... Of the first connection parts 151a, 151a, the through holes 155ah, 155ah of the first lead part 155a, and the through holes 122sc, 122sc of the positive current collecting terminal 122y communicate with each other. Yes.

In addition, the second connection portions 151b and 151b of the first conductive plates 151 and 151 are located on the inner side in the axis AX direction than the positive electrode slits 122h, 122h,. 122s,... Are combined to form the positive electrode current collecting terminal portion 122y, so that the positive electrode exposed portions 122r and 122r exposed to the outside in the axis AX direction are in contact with each other from the outside in the axis AX direction. And by this contact, the second connecting portions 151b and 151b and the positive electrode exposed portions 122r and 122r are electrically connected. (See FIG. 1, FIG. 2, etc.). Note that the second connection portions 151b and 151b and the positive electrode exposed portions 122r and 122r may be joined by a conductive adhesive, solder, or the like.
Further, the first connecting portions 151a and 151a and the first lead portion 155a and the positive electrode current collecting terminal portion 122y are tightly coupled to each other by the rivets 153 and 153.

  On the other hand, the third lead portion 155c of the lead member 155 is connected to the lid main body portion 113e of the first lid member 113 by laser welding (see FIGS. 1, 17 and the like). In addition, in FIG. 17 etc., the welding location is shown by the "x" mark. In this way, the positive electrode current collecting terminal portion 122y of the wound electrode body 120 is electrically connected to the first lid member 113 via the first conductive plates 151 and 151 and the lead member 155.

Two second conductive plates 161 and 161 are connected to the negative electrode current collecting terminal portion 132y (see FIGS. 1 and 2).
The second conductive plate 161 is orthogonal to the plate-like second connection portion 161b, the plate-like third connection portion 161c parallel to the plate-like second connection portion 161b, and the second connection portion 161b and the third connection portion 161c. And a plate-like first connecting portion 161a that connects the two. Among these, the 1st connection part 161a is provided with the through-hole (not shown) corresponding to the through-holes 132sc and 132sc of the negative electrode current collection terminal part 132y.

  The first connecting portions 161a and 161a of the two second conductive plates 161 and 161 are in contact with and electrically connected to the negative electrode current collecting terminal portion 132y from a direction orthogonal to the axis AX. Specifically, the negative electrode current collector terminal portion 132y from the direction perpendicular to the axis AX between the first connection portion 161a of one second conductive plate 161 and the first connection portion 161a of the other second conductive plate 161. Is sandwiched. In this state, the through holes of the first connecting portions 161a and 161a communicate with the through holes 132sc and 132sc of the negative electrode current collector terminal 132y.

In addition, the second connection portions 161b and 161b of the second conductive plates 161 and 161 are located on the inner side in the axis AX direction than the negative electrode slits 132h, 132h,. The negative electrode current collector terminal portion 132y is configured by gathering 132s,..., And is in contact with the negative electrode exposed portions 132r and 132r exposed on the outer side in the axis AX direction from the outer side in the axis AX direction. And by this contact, the second connection parts 161b and 161b and the negative electrode exposed parts 132r and 132r are electrically connected. (See FIG. 1, FIG. 2, etc.). Note that the second connecting portions 161b and 161b and the negative electrode exposed portions 132r and 132r may be joined by a conductive adhesive or solder.
The first connecting portions 161a and 161a and the negative current collecting terminal portion 132y are tightly coupled to each other by the rivets 163 and 163.

  On the other hand, the third connection portions 161c and 161c of the second conductive plates 161 and 161 are laser-welded in a state of being in contact with the lid main body portion 115e of the second lid member 115 from the axis AX direction (FIGS. (See 2 etc.). In addition, in FIG. 2 etc., the welding location is shown by the "x" mark. In this way, the negative electrode current collecting terminal portion 132y of the wound electrode body 120 is electrically connected to the second lid member 115 via the second conductive plates 161 and 161.

  As described above, in the lithium secondary battery 100 of the present embodiment, the positive electrode current collectors 122m, 122s,. A terminal portion 122y is configured. For this reason, like the prior art 1 and 2 (refer FIG.21 and FIG.22), many current collection tabs 915,915, ... are connected to the strip | belt-shaped edge part 913, These current collection tabs 915,915, ... The wound electrode body 120 and the lithium secondary battery 100 can be downsized as compared with the case of welding or tightening. In addition, there is no fear of a decrease in current collection efficiency that occurs when the current collecting tabs 915, 915,. Furthermore, there is no need to connect a current collecting tab, and as will be described later, the positive electrode current collecting terminal portion 122y can be easily formed, so that the lithium secondary battery 100 can be made inexpensive.

Further, as in the reference embodiment (see FIGS. 23 and 24), when the current collecting terminal portion 941 is formed by gathering the belt-shaped end portions 913 without providing the slits in the belt-shaped end portions 913, as described above. In addition, resistance variation tends to occur in the current collecting terminal portion 941. However, in the lithium secondary battery 100 of the present embodiment, since the positive electrode strip-shaped end portion 122m is provided with the positive electrode slit 122h, 122h,..., The positive electrode band-shaped end portion 122m (positive electrode slit outer portion 122s, 122s,. Resistance variations hardly occur in the positive electrode current collecting terminal portions 122y collected and overlapped with each other.
In addition, since the positive electrode slits 122h, 122h,... Are formed, when forming the positive electrode current collecting terminal portion 122y, the width direction of the positive electrode slits 122h, 122h,. Since it is difficult to affect the inner portion (in the direction of the axis AX), it is possible to prevent the active material layers 123 and 133 from being peeled off at the positive electrode plate 121 and the negative electrode plate 132.

  In the present embodiment, the negative electrode slit outer end portions 132s, 132s,... Of the negative electrode strip-like end portion 132m of the negative electrode plate 131 are gathered together and overlap each other to constitute the negative electrode current collecting terminal portion 132y. For this reason, like the prior art 1 and 2 (refer FIG.21 and FIG.22), many current collection tabs 915,915, ... are connected to the strip | belt-shaped edge part 913, These current collection tabs 915,915, ... The wound electrode body 120 and the lithium secondary battery 100 can be downsized as compared with the case of welding or tightening. In addition, there is no fear of a decrease in current collection efficiency that occurs when the current collecting tabs 915, 915,. Furthermore, there is no need to connect a current collecting tab, and as will be described later, since the negative electrode current collecting terminal portion 132y can be easily formed, the lithium secondary battery 100 can be made inexpensive.

Further, as in the reference embodiment (see FIGS. 23 and 24), when the current collecting terminal portion 941 is formed by gathering the belt-shaped end portions 913 without providing the slits in the belt-shaped end portions 913, as described above. In addition, resistance variation tends to occur in the current collecting terminal portion 941. However, in the lithium secondary battery 100 of the present embodiment, resistance variations are unlikely to occur in the negative electrode current collecting terminal portion 132y that has the negative electrode band-shaped end portions 132m (negative electrode slit outer portions 132s, 132s,.
Further, since the negative electrode slits 132h, 132h,... Are formed, when forming the negative electrode current collector terminal portion 132y, the width direction of the negative electrode slits 132h, 132h,. Since the inner portion (in the direction of the axis AX) is hardly affected, it is possible to prevent the active material layers 123 and 133 from being peeled off at the positive electrode plate 121 and the negative electrode plate 131.

  In the present embodiment, not only the positive electrode current collector terminal portion 122y but also the positive electrode band-shaped end portion 122m of the positive electrode metal foil current collector 122 of the positive electrode plate 121 using the first conductive plates 151 and 151 described above, The positive electrode exposed portions 122r and 122r are also electrically connected to the first conductive plates 151 and 151, respectively. For this reason, since the positive electrode belt-shaped end portion 122m and the first conductive plates 151 and 151 can be connected with lower resistance, a positive potential can be taken out of the battery with lower resistance through the first conductive plates 151 and 151. .

  Further, in the present embodiment, not only the negative electrode current collector terminal portion 132y but also the negative electrode strip end portion 132m of the negative electrode metal foil current collector 132 of the negative electrode plate 131 using the second conductive plates 161 and 161 described above, The negative electrode exposed portions 132r and 132r are also electrically connected to the second conductive plates 161 and 161, respectively. For this reason, since the negative electrode belt-shaped end portion 132m and the second conductive plates 161 and 161 can be connected with a lower resistance, a negative potential can be extracted outside the battery with a lower resistance via the second conductive plates 161 and 161. .

  Further, since the second conductive plate 161 has the above-described third connection portion 161c, the negative electrode band-shaped end portion 132m (the negative electrode current collecting terminal portion 132y and the negative electrode exposed portions 132r and 132r) and the second lid member 115 are connected. Only the second conductive plates 161 and 161 can be electrically connected. For this reason, it is not necessary to use a lead wire or the like for the connection between the second conductive plate 161 and the second lid member 115, and the lithium secondary battery 100 can be made inexpensive.

Next, a method for manufacturing the lithium secondary battery 100 will be described.
First, the positive electrode plate 121 is manufactured (see FIG. 7). A positive electrode metal foil current collector 122 made of a long aluminum foil is prepared. In the paste application step, the first positive electrode uncoated portion 122m and the second positive electrode uncoated portion in the longitudinal direction along both ends in the width direction of the positive electrode metal foil current collector 122 are pasted by the paste applicator 210. While forming 122n, the positive electrode active material paste containing a positive electrode active material is apply | coated to the center part (positive electrode coating part 122w).
Thereafter, in the drying step, hot air is blown by the dryer 220 to dry the positive electrode active material paste applied to the positive electrode metal foil current collector 122, thereby forming the positive electrode active material 123.

Thereafter, in the pressing step, the positive electrode active material layer 123 is compressed by a press machine (pressure roll) 230 in order to improve the electrode density.
Thereafter, in the slit forming step, a number of positive electrode slits 122h extending intermittently in the longitudinal direction at a predetermined position of the first positive electrode uncoated portion (positive electrode strip end portion) 122m by a slit forming machine 240 having a circular rotary blade 241. , 122h,.
Then, in the punching process, two punches are passed through the punching machine 250 having the punching blade 251 at predetermined positions of the positive electrode slit outer portions 122s, 122s,... In the first positive electrode uncoated portion (positive electrode strip end portion) 122m. Holes 122sc and 122sc are formed. Thus, the positive electrode plate 121 is formed.

  The slit formation and punching process can be performed prior to the paste application process. That is, first, in the slit formation and punching process, positive slits 122h, 122h,... And through holes 122sc, 122sc,. The positive electrode plate 121 can also be formed by performing a process and a pressing process.

Next, the negative electrode plate 131 is manufactured. A negative electrode metal foil current collector 132 made of a long copper foil is prepared. In the paste application step, the first negative electrode uncoated portion 132m and the second negative electrode uncoated portion in the longitudinal direction along both ends in the width direction of the negative electrode metal foil current collector 132 are pasted by the paste applicator 210. While forming 132n, the negative electrode active material paste containing a negative electrode active material is apply | coated to the center part (negative electrode coating part 132w).
Thereafter, in the drying step, hot air is blown by the dryer 220 to dry the negative electrode active material paste applied to the negative electrode metal foil current collector 132, thereby forming the negative electrode active material 133.

Thereafter, in the pressing step, the negative electrode active material layer 133 is compressed by a press machine (pressure roll) 230 in order to improve the electrode density.
Thereafter, in the slit forming step, a number of negative electrode slits 132h extending intermittently in the longitudinal direction at predetermined positions of the first negative electrode uncoated portion (negative electrode strip end portion) 132m by a slit forming machine 240 having a circular rotary blade 241. , 132h,.
Thereafter, in the punching process, two punching holes are formed at predetermined positions on the negative electrode slit outer side portions 132s, 132s,... Of the first negative electrode uncoated portion (negative electrode strip end portion) 132m by a punching machine 250 having a punch blade 251. 132sc and 132sc are formed. Thus, the negative electrode plate 131 is formed.

  In the manufacture of the negative electrode plate 131, the slit formation and punching process can be performed prior to the paste application process. That is, first, in the slit forming and punching process, negative electrode slits 132h, 132h,... And through holes 132sc, 132sc,. The negative electrode plate 131 can also be formed by performing a process and a pressing process.

  Next, in the winding step, as shown in FIGS. 8 and 9, the positive electrode plate 121 and the negative electrode plate 131 are overlapped with each other via the separator 141 and wound around the axis AX, and the positive electrode metal foil is disposed on one end side. The positive electrode strip end 122m of the current collector 122 protrudes in a spiral shape, and the negative electrode strip end 132m of the negative electrode metal foil current collector 132 protrudes in a spiral shape on the other end side. In addition, the positive electrode slits 122h, 122h,... Are divided into two groups alternately, and the positive electrode slits 122h, 122h,. Let it be. Further, the negative electrode slits 132h, 132h,... Are alternately divided into two groups, and the negative electrode slits 132h, 132h,. Let it be.

  In addition, by this winding process, a large number of positive electrode slit outer portions 122s, 122s,... Are alternately divided into two groups and arranged substantially symmetrically when viewed from the direction of the axis AX. 122s and 122s are adjacent to each other in the radial direction. In addition, a large number of negative electrode slit outer portions 132s, 132s,... Are alternately divided into two groups and arranged substantially symmetrically with respect to the axis AX direction, and the negative electrode slit outer portions 132s, 132s of each group are in the radial direction. Next to each other.

  Further, the through holes 122sc, 122sc,... Of the positive electrode slit outer portions 122s, 122s,... Are alternately divided into two groups, and are arranged substantially symmetrically with respect to the axis AX direction. The holes 122sc, 122sc,... Are adjacent to each other in the radial direction. Further, the through holes 132sc, 132sc,... Of the negative electrode slit outer portions 132s, 132s,... Are alternately divided into two groups, and are arranged substantially symmetrically with respect to the axis AX direction. The holes 132sc, 132sc,... Are adjacent to each other in the radial direction.

  Next, in the current collecting terminal part forming step, among the positive electrode belt-shaped end parts 122m, a large number of positive electrode slit outer parts 122s, 122s,... A positive current collecting terminal portion 122y having a shape is formed. Further, among the negative electrode belt-shaped end portions 132m, a large number of negative electrode slit outer portions 132s, 132s,... Are gathered together by pressing to be overlapped with each other, and a negative electrode current collecting terminal portion 132y having a H-shaped cross section perpendicular to the axis AX. Form. Thereby, the positive electrode exposed part 122r and the negative electrode exposed part 132r are exposed to the outside in the direction of the axis AX. Thus, the wound electrode body 120 shown in FIGS. 10 and 11 is formed.

  Next, as shown in FIG. 12, the first conductive plate 151 and the lead member 155 are prepared. Then, as shown in FIG. 13, the first connection portion 151a of the first conductive plate 151 and the first lead portion 155a of the lead member 155 are overlapped with each other, and the through holes 151ah and 151ah of the first connection portion 151a and the first lead are overlapped. In a state where the through holes 155ah and 155ah of the portion 155a are communicated with each other, they are welded to each other.

Next, a positive current collecting terminal is provided between the first connecting portion 151a of the first conductive plate 151 and the first lead portion 155a of the lead member 155 and the first connecting portion 151a of the other first conductive plate 151. Through the portion 122y, the through holes 151ah, 151ah,... Of the first connection portions 151a, 151a, the through holes 155ah, 155ah of the first lead portion 155a, and the through holes 122sc, 122sc of the positive current collector terminal 122y are communicated. (See FIG. 14).
Further, the second connection portions 151b and 151b of the first conductive plates 151 and 151 are brought into contact with the positive electrode exposed portions 122r and 122r of the positive electrode strip-shaped end portion 122m from the outside in the axis AX direction, respectively, and the first connection plate 151 and 151b The two connecting portions 151b and 151b and the positive electrode exposed portions 122r and 122r are electrically connected.
Then, the first connecting portions 151a and 151a and the first lead portion 155a and the positive electrode current collecting terminal portion 122y are tightly coupled to each other by the rivets 153 and 153.

Next, the second conductive plates 161 and 161 described above are prepared. Then, the first connecting portion 161a, the negative current collecting terminal portion 132y is sandwiched between the first connecting portion 161a of one second conductive plate 161 and the first connecting portion 161a of the other second conductive plate 161. The through hole 161a and the through holes 132sc and 132sc of the negative electrode current collector terminal 132y are communicated (see FIG. 14).
Further, the second connection portions 161b and 161b of the second conductive plates 161 and 161 are brought into contact with the negative electrode exposed portions 132r and 132r of the negative electrode belt-shaped end portion 132m from the outside in the axis AX direction, respectively, and the first connection is performed only by this contact. The two connecting portions 161b and 161b and the negative electrode exposed portions 132r and 132r are electrically connected.
Then, the first connecting portions 161a and 161a and the negative electrode current collecting terminal portion 132y are coupled to each other by the rivets 163 and 163.

Next, as shown in FIG. 15, the lid main body 115e of the second lid member 115 is brought into contact with the third connecting portions 161c and 161c of the second conductive plates 161 and 161, and these are laser-welded.
Next, the battery case body 111 is prepared, and the wound electrode body 120 and the like are inserted into the battery case body 111. And the 2nd gasket 119 (refer FIG. 1) is arrange | positioned between the 2nd cover member 115 and one edge part 111c2 of the battery case main body 111, and the edge part 111c2 of the battery case main body 111 is crimped. Thereby, as shown in FIG. 16, the second lid member 115 and the battery case body 111 are fixed to each other while being electrically insulated.
Next, as shown in FIG. 17, the lid main body portion 113e of the first lid member 113 is overlapped on the third connection portion 155c of the lead member 155, and these are laser-welded.

Next, two spacers 171 for preventing rattling shown in FIG. 18 are prepared. These spacers 171 and 171 are arranged between the battery case main body 111 and the wound electrode body 120 as shown in FIGS.
Next, the first gasket 117 (see FIG. 1) is disposed between the first lid member 113 and the other end 111c1 of the battery case main body 111, and the end 111c1 of the battery case main body 111 is crimped. Accordingly, as shown in FIG. 20, the first lid member 113 and the battery case body 111 are fixed to each other while being electrically insulated.
Next, the electrolytic solution is injected into the battery case 110 from the electrolytic solution injection port 113eh provided in the first lid member 113, and then the electrolytic solution injection port 113eh is closed by the plug 118. Thus, the lithium secondary battery 100 is obtained.

  As described above, in the manufacturing method according to the present embodiment, the positive electrode plate 121 and the negative electrode plate 131 are stacked with the separator 141 interposed therebetween and wound in the slit forming step before the positive electrode belt-shaped end. The positive slits 122h, 122h,... Are formed in the portion 122m. Further, negative electrode slits 132h, 132h,... Are formed in the negative electrode belt-shaped end portion 132m. By doing in this way, the chips generated when forming the positive electrode slits 122h, 122h,... And the chips generated when forming the negative electrode slits 132h, 132h,. It is possible to prevent chips from entering the rotary electrode body 120. Therefore, the lithium secondary battery 100 with high reliability can be manufactured.

  Further, in the present embodiment, prior to the winding process described above, through holes 122sc, 122sc,... Are formed in the positive electrode slit outer portions 122s, 122s,. Further, through holes 132sc, 132sc,... Are formed in the negative electrode slit outer portions 132s, 132s,. By doing in this way, the chips generated when forming the through holes 122sc, 122sc,... And the chips generated when forming the through holes 132sc, 132sc,. It is possible to prevent chips from entering the rotary electrode body 120. Therefore, the lithium secondary battery 100 with high reliability can be manufactured.

In the above, the present invention has been described with reference to the embodiment. However, the present invention is not limited to the above-described embodiment, and it is needless to say that the present invention can be appropriately modified and applied without departing from the gist thereof.
For example, in the above embodiment, the first connecting portions 151a and 151a of the first conductive plates 151 and 151 and the first lead portion 155a of the lead member 155 and the positive electrode current collecting terminal portion 122y of the wound electrode body 120 are connected to the rivet. These are connected by 153 and 153, but they can also be connected by welding, solder, conductive adhesive or the like. Similarly, the first connecting portions 161a and 161a of the second conductive plates 161 and 161 and the negative electrode current collecting terminal portion 132y of the wound electrode body 120 are connected by rivets 163 and 163. It can also be connected with solder, conductive adhesive, or the like.

100 Lithium secondary battery (battery)
110 Battery Case 111 Battery Case Body 111h1, 111h2 Opening 113 First Lid Member (External Electrode Member)
115 Second lid member (external electrode member)
120 wound electrode body 121 positive electrode plate 122 positive electrode metal foil current collector 122m first positive electrode uncoated portion (band-shaped end)
122h Positive electrode slit 122s Positive electrode slit outer part 122y Positive electrode current collector terminal part 122r Positive electrode exposed part 123 Positive electrode active material layer 131 Negative electrode plate 132 Negative electrode metal foil current collector 132m First negative electrode uncoated part (band-like end part)
132h Negative electrode slit 132s Negative electrode slit outer portion 132y Negative current collecting terminal portion 132r Negative electrode exposed portion 133 Negative electrode active material layer 141 Separator 151 First conductive plate (conductive member)
151a First connection portion 151b Second connection portion 155 Lead member 161 Second conductive plate (conductive member)
161a 1st connection part 161b 2nd connection part 161c 3rd connection part AX Axis line

Claims (5)

A positive electrode metal foil current collector and a long positive electrode plate having a positive electrode active material layer formed on the positive electrode metal foil current collector; a negative electrode metal foil current collector; and the negative electrode metal foil current collector A wound-type electrode body formed by winding a long negative electrode plate having a formed negative electrode active material layer and winding them around an axis line with a long separator interposed therebetween,
On one end side in the axial direction, the strip-shaped end portion that is exposed and located at the end in the width direction of the positive electrode metal foil current collector forms a spiral shape, and protrudes from the separator,
On the other end side in the axial direction, a wound type in which a strip-shaped end portion of the negative electrode metal foil current collector located at the end in the width direction and exposed to form a strip shape spirals and protrudes from the separator A battery comprising an electrode body,
Of the strip-shaped end portion of the positive electrode metal foil current collector and the strip-shaped end portion of the negative electrode metal foil current collector, at least one of the strip-shaped end portions extends intermittently in the longitudinal direction and is wound. Having a plurality of slits adjacent to each other in the radial direction;
Among the strip-shaped end portions, a plurality of slit outer portions that are located outside the slit in the width direction and are adjacent to each other in the radial direction in a wound state are gathered and overlapped with each other to collect current collecting terminal portions A battery comprising The battery according to claim 1,
The battery which has the said current collection terminal part in each of the said positive electrode metal foil collector and the said negative electrode metal foil collector. The battery according to claim 1 or 2,
The strip-shaped end portion is located on the inner side in the axial direction from the slit, and has an exposed portion exposed to the outer side in the axial direction by forming the current collecting terminal portion by gathering the outer portions of the slit. And
A conductive member electrically connected to the strip-shaped end,
A first connecting portion that contacts the current collecting terminal portion from a direction orthogonal to the axis and is electrically connected to the current collecting terminal portion;
A battery further comprising: a conductive member having a second connection portion that is electrically connected to the first connection portion, contacts the exposed portion from the outside in the axial direction, and is electrically connected to the exposed portion. The battery according to claim 3,
A battery case body having an opening and accommodating the wound electrode body;
An external electrode member that closes the opening of the battery case body and forms an external electrode of the battery, and includes a battery case.
The battery includes a third connection portion that extends from the first connection portion, contacts the external electrode member, and is electrically connected to the external electrode member. A positive electrode metal foil current collector and a long positive electrode plate having a positive electrode active material layer formed on the positive electrode metal foil current collector; a negative electrode metal foil current collector; and the negative electrode metal foil current collector A wound-type electrode body formed by winding a long negative electrode plate having a formed negative electrode active material layer and winding them around an axis line with a long separator interposed therebetween,
On one end side in the axial direction, the strip-shaped end portion that is exposed and located at the end in the width direction of the positive electrode metal foil current collector forms a spiral shape, and protrudes from the separator,
On the other end side in the axial direction, a wound type in which a strip-shaped end portion of the negative electrode metal foil current collector located at the end in the width direction and exposed to form a strip shape spirals and protrudes from the separator An electrode body,
Of the strip-shaped end portion of the positive electrode metal foil current collector and the strip-shaped end portion of the negative electrode metal foil current collector, at least one of the strip-shaped end portions extends intermittently in the longitudinal direction and is wound. Having a plurality of slits adjacent to each other in the radial direction;
Among the strip-shaped end portions, a plurality of slit outer portions that are located outside the slit in the width direction and are adjacent to each other in the radial direction in a wound state are gathered and overlapped with each other to collect current collecting terminal portions A battery manufacturing method comprising:
A winding step in which the positive electrode plate and the negative electrode plate are overlapped with each other via the separator and wound around the axis line, and the band-shaped end portion of the positive electrode metal foil current collector is disposed on the one end side. A winding step in which the strip-shaped end of the negative electrode metal foil current collector protrudes on the other end side, and the slits are wound in a form adjacent to each other in the radial direction;
Prior to the winding step, a slit forming step of forming the slit in the band-shaped end,
A battery manufacturing method comprising: a current collecting terminal part forming step of forming the current collecting terminal part by gathering the slit outer parts out of the belt-shaped end part and gathering each other after the winding process.

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