WO2018153533A1

WO2018153533A1 - Electrical energy storage unit having at least one electrically insulated electrode material layer and corresponding production method

Info

Publication number: WO2018153533A1
Application number: PCT/EP2017/083750
Authority: WO
Inventors: Robert Hafenbrak; Daniel Bernd Greiner; Christian Wagner; Matthias Riedmann
Original assignee: Robert Bosch Gmbh
Priority date: 2017-02-24
Filing date: 2017-12-20
Publication date: 2018-08-30
Also published as: CN110313085A; DE102017202995A1

Abstract

The invention relates to an electrical energy storage unit (100), comprising at least one first pole connection point (102) and one second pole connection point (103) and at least one first layer (111) of a first electrode material, the at least one first layer (111) of the first electrode material being electrically insulated from the at least one first pole connection point (102) and being electrically insulated from the at least one second pole connection point (103). The invention further relates to an electrical energy storage system comprising the electrical energy storage unit (100) according to the invention, and to a corresponding production method for the electrical energy storage unit (100) according to the invention.

Description

description

Electrical energy storage unit with at least one electrically insulated electrode material layer and corresponding manufacturing method

The present disclosure is based on an electrical energy storage unit according to the preamble of the independent claims.

State of the art

In the course of increasing electrification, especially of the powertrain of vehicles, more batteries or battery packs are used as electrical energy storage. These memories usually consist of a large number of battery cells, which are electrically interconnected. In the course of the aging of the battery cells as electrical energy storage units, among other things, their mechanical and electrical properties, for example the internal electrical resistance and the electrical capacity, change as a maximum or nominally storable charge quantity. This can lead to any problems in an exchange of a single or more electrical energy storage units, which can be reduced only inadequately or with great effort by internal measures in the electrical energy storage.

Disclosure of the invention

Advantages of the invention

Disclosed is an electrical energy storage unit, comprising at least a first pole terminal and a second pole terminal and at least a first layer of a first electrode material, with the characterizing features of the independent claims. In this case, the at least one first layer of the first electrode material is electrically insulated from the at least one first pole connection and also electrically insulated from the at least one second pole connection. Thus, for example, the electrical capacitance or the internal electrical resistance can be specifically adapted to a target value, which simplifies the exchange within an electrical energy store comprising a plurality of electrical energy storage units using the electrical energy storage unit produced in this way. Furthermore, the electrical energy storage unit produced in this way does not differ in its mechanical properties, or only insignificantly, from the electrical energy storage units already installed in the electrical energy storage system. For example, when using the stacking method for the production of battery cells, it may not be possible to carry out the contacting of individual stack layers or not to carry out the corresponding contacting surfaces for these stack layers.

Further advantageous embodiments of the present invention are the subject of the dependent claims.

Expediently, the electrical energy storage unit comprises an electrode assembly, the electrode assembly further comprising at least one second layer of the first electrode material and at least one further first layer of a second electrode material, wherein the at least one second layer of the first electrode material is electrically conductively connected to the first pole terminal and the at least a further first layer of the second electrode material is electrically conductively connected to the second pole connection. Thus, a simple use of the electrical energy storage unit is possible without limiting its functionality.

Expediently, the electrical energy storage unit further has at least one second layer of the second electrode material, which is electrically insulated from the at least one first pole terminal and is electrically insulated from the at least one second pole terminal. Thus, it is advantageously ensured that the electrical energy storage unit produced in this way has identical mechanical properties as a fully contacted electrical energy storage unit, which ensures the compatibility of the installation in an electrical energy storage system. Advantageously, the at least one first layer of the first electrode material is applied to a first electrically conductive carrier layer. Thus, the same materials, processes and machines can be used for producing the electrically insulated at least one first layer, which thus does not entail any costly changes to the previous production process for the electric energy storage unit and enables easy integration into the usual production.

Advantageously, the corresponding layers of the second electrode material are also applied to an electrically conductive carrier layer.

Conveniently, the first carrier layer has no contact lug for electrical contacting. Thus, undesired electrical contacting of the first layer of the first electrode material with the pole connections or current conductors of the electrical energy storage unit is advantageously precluded, which simplifies the manufacturing process of the electrical energy storage unit and increases its reliability. This may also be applied to a backing layer of the second electrode material. Advantageously, it can be provided in one embodiment that the contact lugs are used directly as pole terminals. If a carrier layer then has no corresponding contact lug, it can be electrically insulated from the corresponding pole connection, with the pole connection being formed by the corresponding contact lugs.

Expediently, the largest of the surfaces of the first carrier layer is designed as a convex surface. This includes, for example, rectangular areas. This ensures that the manufacturing process of the electrical energy storage unit can be performed reliably. This may also apply to a carrier layer of the second electrode material. Advantageously, the at least one second layer of the first electrode material is applied to a second electrically conductive carrier layer, wherein in the case of a parallel projection of the first carrier layer onto the second carrier layer, the projected area of the first carrier layer lies at least partially within the area of the second carrier layer as the projection plane. Thus, the probability of an electrical connection between the carrier layers is reduced in an advantageous manner and at the same time the material consumption is reduced. This can also apply to corresponding carrier layers of the second electrode material.

Conveniently, the parallel projection is an orthogonal projection. Thus, the advantages mentioned in the paragraph above can be achieved, for example, for the stacking method used in the manufacture of electrical energy storage units, where several layers are stacked on top of one another.

Expediently, the material of the first carrier layer and / or the material of the second carrier layer comprises aluminum and / or copper. Thus, the compatibility of the carrier layers with a plurality of already known anode and cathode materials or electrolyte liquids is advantageously ensured. This may also apply to corresponding carriers applied to the second electrode material.

Conveniently, the electrical energy storage unit is a pouch cell. Thus, the aforementioned advantages can be transferred to a widely used form of electrical energy storage unit.

Furthermore, the subject matter of the invention is an electrical energy storage system which comprises at least one of the electrical energy storage units described above and an electronic control unit, wherein the electronic control unit is set up to monitor the at least one electrical energy storage unit. In particular, the electronic control unit is designed as a battery management system, which may comprise corresponding means for detecting physical and / or chemical variables, for example a current. Thus, the aforementioned advantages can be realized within the described electrical energy storage system. Furthermore, the invention relates to a method for producing an electrical energy storage unit with the steps described below. In a first step, at least one first layer of a first electrode material on a first electrically conductive carrier layer without contact lug, at least one second layer of the first electrode material on a second electrically conductive carrier layer with a first contact lug and at least one further first layer of a second electrode material a further electrically conductive carrier layer provided with a further contact lug. Subsequently, an electrically conductive connection of the at least one second layer of the first electrode material by means of the first contact lug with a first pole terminal of the electrical energy storage unit and an electrically conductive connection of the at least one further first layer of the second electrode material by means of the further contact lug with the second pole terminal of the electrical energy storage unit , Subsequently, the at least one first layer of the first electrode material on the first electrically conductive carrier layer without contact lug, the at least one second layer of the first electrode material on the second electrically conductive carrier layer with the first contact lug and the at least one further first layer of the second electrode material on the other electrically conductive carrier layer with the further contact lug introduced into a housing of the electrical energy storage unit. Alternatively, the step of inserting into the housing and the step of electrically conductive bonding may also take place in reverse order. Thus, the above-mentioned advantages can be realized by the above-mentioned manufacturing process.

An electronic control unit may, in particular, comprise an electronic control unit which, for example, has a microcontroller and / or an application-specific hardware component, e.g. an ASIC may be understood, but may also include a personal computer or a programmable logic controller.

An electric energy storage unit may in particular be understood as meaning an electrochemical battery cell and / or a battery module having at least one electrochemical battery cell and / or a battery pack having at least one battery module. For example, the electric energy storage unit may be a lithium-based battery cell or a lithium-based battery module or a lithium based battery pack. In particular, the electrical energy storage unit may be a lithium-ion battery cell or a lithium-ion battery module or a lithium-ion battery pack. Furthermore, the battery cell of the type lithium polymer accumulator, nickel-metal hydride accumulator, lead-acid accumulator, lithium-air accumulator or lithium-sulfur accumulator or more generally an accumulator of any electrochemical composition. A capacitor is possible as an electrical energy storage unit.

Brief description of the drawings

Advantageous embodiments of the invention are illustrated in the figures and explained in more detail in the following description.

Show it:

Figure 1 is a schematic longitudinal sectional view of the disclosed electrical energy storage unit according to a first embodiment;

Figure 2 is a schematic representation of a first carrier layer;

Figure 3 is a schematic representation of an orthogonal projection of a first carrier layer on a second carrier layer;

Figure 4 is a schematic representation of a portion of an electrode assembly for an electrical energy storage unit; and

Figure 5 is a flowchart of the claimed method according to a first embodiment.

Embodiments of the invention

Identical reference signs denote the same device components or the same method steps in all figures. FIG. 1 shows a schematic longitudinal sectional view of the disclosed electrical energy storage unit 100 according to a first embodiment. In this case, the electrical energy storage unit 100 is surrounded by a housing 101 from which the first pole terminal 102 and the second pole terminal 103 protrude. Furthermore, a first layer 111 of a first electrode material is shown, which is electrically insulated from the two pole terminals 102, 103. The first layer 111 of the first electrode material is located on a first carrier layer 109, wherein both elements belong to an electrode assembly 117. The electrode assembly further comprises a second layer 108 of the first electrode material and a further first layer 107 of a second electrode material, the second layer 108 of the first electrode material being electrically conductively connected to the first pole connection 102 via the current conductor 104 by means of a second electrically conductive carrier layer 115. The second electrically conductive carrier layer 115 has a first contact lug 114. The further first layer 107 of the second electrode material is electrically conductively connected to the second pole connection 103 via the current conductor 105 by means of a further electrically conductive carrier layer 116. In this case, the further electrically conductive carrier layer 116 has a further contact lug 113. Furthermore, the second layer 108 of the first electrode material and the further first layer 107 of the second electrode material are electrically insulated from one another by a separator layer 106. The electrode assembly 117 further comprises a further second layer 112 of the second electrode material, which is applied to a further second carrier layer 110. The further second carrier layer 110, like the first carrier layer 109, has no contact lug and is thus also electrically insulated from the first pole connection 102 and the second pole connection 103. As can also be seen from FIG. 1, carrier layers can be coated on both sides with electrode material. As shown in FIG. 1, the electrode assembly 117 can comprise a plurality of carrier layers with a plurality of electrode material layers.

FIG. 2 shows a first electrically conductive carrier layer 200 to which a first layer 201 of a first electrode material has been applied. In this case, the first carrier layer 200 has no contact lug for electrical contacting. Furthermore, it can be seen that both the carrier layer 200 and the first layer 201 of the first electrode material rectangular, that is configured as convex surfaces.

FIG. 3 shows a schematic representation of an orthogonal projection of a first carrier layer 302 onto a second carrier layer 301. The arrow 306, which is at a right angle to the first carrier layer 302, predefines the projection direction with which the first carrier layer 302 rests the second carrier layer 301 is projected, wherein the first carrier layer 302 and the second carrier layer 301 are parallel to each other. As can be seen and indicated by the dashed lines 307, the projected area of the first carrier layer 302 lies within the area of the second carrier layer 301 as a projection plane. Since the connecting line between a point of the first carrier layer 302 and its projected pixel in the second carrier layer 301 forms a right angle with the second carrier layer 301, this is an orthogonal projection. Furthermore, a first layer 305 of a first electrode material is shown, which is applied to the first carrier layer 302. In addition, a second layer 304 of the first electrode material is shown, which is applied to the second carrier layer 301. FIG. 4 shows a schematic representation of part of an electrode assembly 400 for an electrical energy storage unit, in particular a pouch cell. The electrode assembly 400 includes a first layer 412 of a first electrode material. Underneath is a first separator layer 413 and above a second separator layer 411. In this case, a first carrier layer of the first electrode layer 412 of the first electrode material (not explicitly shown here) has no terminal lug for electrical contacting. The second separator layer 411 is adjoined by a further second layer 410 of a second electrode material. Furthermore, a further second carrier layer (not explicitly shown here) of the further second layer 410 of the second electrode material has no terminal lug for electrical contacting. So these are

Layers electrically isolated from the pole terminals, not shown here, the electrical energy storage unit. A third separator layer 409 adjoins the further first layer 410 of the second electrode material. The third separator layer 409 is followed by a second layer 408 of the first electrode material. A not shown here second carrier layer of the second layer

408 of the first electrode material has a first terminal lug 418 to electrical contact, in particular for electrically conductive connection with a pole connection not explicitly shown here, on. The second layer 408 of the first electrode material is followed by a fourth separator layer 407. This is followed by another first layer 406 of the second electrode material. A further first carrier layer of the further first layer 406 of the second electrode material, which is not explicitly shown here, has a further terminal lug 419 for making electrical contact. This is followed by a fifth separator layer 405. This fifth separator layer 405 is followed by a third layer 403 of the first electrode material. A third carrier layer of the third electrode layer 403 of the first electrode material, not explicitly shown here, has a second connection lug 404 for electrical contacting. This is followed by a sixth separator layer 402, on which there is a further third layer 401 of the second electrode material. A further third carrier layer, which is not explicitly shown here, of the further third layer 401 of the second electrode material has a further second terminal lug 414 for electrical contacting.

FIG. 5 shows a flow chart of the claimed method for producing an electrical energy storage unit according to a first embodiment. In a first step S1, at least one first layer 111, 201, 305, 412 of a first electrode material is provided on a first electrically conductive carrier layer 109, 200, 302 without a contact lug. Furthermore, at least one second layer 108, 304, 408 of the first electrode material on a second electrically conductive carrier layer 115, 301 with a first contact lug 106, 303, 418 and at least one further first layer 107, 406 of a second electrode material on a further electrically conductive carrier layer 116 provided with another contact lug 113, 419. Subsequently, in a second step S2, the at least one second layer 108, 304, 408 of the first electrode material is electrically conductively connected to a first pole terminal 102 of the electrical energy storage unit 100 by means of the first contact lug 106, 303, 418. Furthermore, the at least one further first layer 107, 406 of the second electrode material is electrically conductively connected to the second pole connection 103 of the electrical energy storage unit 100 by means of the further contact lug 113, 419. The at least one first layer 111, 201, 305, 412 of the first electrode material on the first electrically conductive carrier layer 109, 200, 302 without contact lug is thus of the at least one first pole connection 102 and the at least one second pole connection 103 electrically isolated. Subsequently, in a third step, the at least one first layer 111, 201, 305, 412 of the first electrode material on the first electrically conductive carrier layer 109, 200, 302 without contact lug, the at least one second layer 108, 304, 408 of the first electrode material on the second electrically conductive carrier layer 115, 301 with the first contact lug

106, 303, 418 and the at least one further first layer 107, 406 of the second electrode material are introduced on the further electrically conductive carrier layer 116 with the further contact lug 113, 419 into a housing 101 of the electrical energy storage unit 100.

Claims

claims

Electric energy storage unit (100) comprising at least a first pole terminal (102) and a second pole terminal (103) and at least one first layer (111, 201, 305, 412) of a first electrode material, characterized in that the at least one first layer (111 , 201, 305, 412) of the first electrode material is electrically insulated from the at least one first pole terminal (102) and is electrically insulated from the at least one second pole terminal (103).

An electrical energy storage unit (100) according to claim 1, characterized in that the electrical energy storage unit (100) comprises an electrode assembly (117, 400), the electrode assembly (117, 400) further comprising at least a second layer (108, 304, 408) of the first Elekt rodenmaterials and at least one further first layer (107, 406) of a second electrode material, wherein the at least one second layer (108, 304, 408) of the first electrode material with the first pole terminal (102) is electrically conductively connected and the at least one further first layer (107, 406) of the second electrode material is electrically conductively connected to the second pole terminal (103).

Electric energy storage unit (100) according to one of the preceding claims, characterized in that the electrical energy storage unit (100) further comprises at least one further second layer (112, 410) of the second electrode material, which is electrically isolated from the at least one first pole terminal (102) and of which at least one second pole terminal (103) is electrically insulated.

Electrical energy storage unit (100) according to one of the preceding claims, characterized in that the at least one first layer (111, 201, 305, 412) of the first electrode material is applied to a first electrically conductive carrier layer (109, 200, 302).

Electric energy storage unit (100) according to one of the preceding claims, characterized in that the first carrier layer (109, 200, 302) has no contact lug for electrical contacting.

6. Electrical energy storage unit (100) according to one of the preceding claims, characterized in that the largest of the surfaces of the first carrier layer (109, 200, 302) is formed as a convex surface. 7. Electrical energy storage unit (100) according to one of claims 4 to

6, characterized in that the at least one second layer (108, 304, 408) of the first electrode material on a second electrically conductive carrier layer (115, 301) is applied, wherein in a parallel projection of the first carrier layer (109, 200, 302) the second carrier layer (115, 301) lies at least partially within the area of the second carrier layer (115, 301) as a projection plane, the projected area of the first carrier layer (109, 200, 302).

8. The electrical energy storage unit (100) of claim 7, wherein the parallel projection is an orthogonal projection.

9. Electrical energy storage unit (100) according to one of claims 4 to 8, characterized in that the material of the first carrier layer (109, 200, 302) and / or the second carrier layer (115, 301) comprises aluminum and / or copper.

10. Electrical energy storage unit (100) according to one of the preceding claims, characterized in that the electrical energy storage unit (100) is a pouch cell.

11. An electrical energy storage system, comprising at least one electrical energy storage unit (100) according to one of the preceding claims and an electronic control unit, which is configured to monitor the at least one electrical energy storage unit (100).

12. A method for producing an electrical energy storage unit (100), comprising the following steps:

a) providing at least one first layer (111, 201, 305, 412) of a first electrode material on a first electrically conductive carrier layer (109, 200, 302) without a contact lug, at least one second layer (108, 304, 408) of the first electrode material on a second electrically conductive carrier layer (115, 301) having a first contact lug (106, 303, 418) and at least one further first layer (107, 406) of a second electrode material on a further electrically conductive carrier layer ( 116) with a further contact lug (113, 419);

b) electrically conductively connecting the at least one second layer (108, 304, 408) of the first electrode material by means of the first contact lug (106, 303, 418) to a first pole terminal (102) of the electrical energy storage unit (100) and electrically connecting the at least a further first layer (107, 406) of the second electrode material by means of the further contact lug (113, 419) with the second pole connection (103) of the electrical energy storage unit (100);

c) introducing the at least one first layer (111, 201, 305, 412) of the first electrode material on the first electrically conductive carrier layer (109, 200, 302) without contact lug, the at least one second layer (108, 304, 408) of the first Electrode material on the second electrically conductive carrier layer (115, 301) with the first contact lug (106, 303, 418) and the at least one further first layer (107, 406) of the second electrode material on the further electrically conductive carrier layer (116) with the other Contact lug (113, 419) in a housing (101) of the electrical energy storage unit (100).