WO2018161350A1

WO2018161350A1 - Efficient nondestructive equalization method for storage battery and system thereof

Info

Publication number: WO2018161350A1
Application number: PCT/CN2017/076297
Authority: WO
Inventors: 苏志强; 张益�
Original assignee: 深圳中兴力维技术有限公司
Priority date: 2017-03-10
Filing date: 2017-03-10
Publication date: 2018-09-13

Abstract

Disclosed by the present invention are an efficient nondestructive equalization method for a storage battery and a system thereof, wherein the method comprises: according to cell information parameters of a battery cell in a storage battery, determining whether the battery cell is a discharging cell or a charging cell; pairing a switch connected to a discharging cell with a switch connected to a charging cell, turning the switches on, and accessing an equalization circuit unit so as to carry out equalization maintenance, wherein the equalization circuit unit comprises a discharging control circuit connected to the discharging cell, a charging control circuit connected to the charging cell, and an isolating and voltage transforming control circuit connected to the discharging control circuit and the charging control circuit. The present invention may reduce energy consumption for battery equalization and transfer energy discharged by a cell to a cell to be charged. At the same time, the present invention may improve the efficiency of equalization maintenance.

Description

High-efficiency non-destructive equalization method for battery and system thereof

[0001] The present invention relates to the technical field of improving battery maintenance, and more particularly to a battery efficient lossless equalization method and system thereof. Background technique

[0002] Batteries are widely used in communication base stations and IDC (Internet Data Center) equipment rooms. They are mainly used to supply power to various devices after the mains power failure. The battery needs to monitor the battery information such as temperature, voltage and internal resistance of the battery and carry out daily management and maintenance to extend its service life.

[0003] Generally, the battery cell float voltage must be kept within the normal range. If the normal range is exceeded, the battery cells need to be balancedly maintained, otherwise the battery life will be reduced. The existing solution for battery cell voltage balanced maintenance is as follows: If the battery cell voltage is higher than the upper limit of the float charging normal range

Then, the battery cells are discharged through the resistive load, and the electric energy is dissipated through the resistive load in the form of thermal energy; if the battery cell voltage is lower than the lower limit of the normal range of the float voltage, the external power source is charged to the battery, and the external power is required to the battery. Single charge. However, during this maintenance process, maintenance efficiency is low, energy consumption is severe, and it is not conducive to green energy conservation.

technical problem

[0004] The main object of the present invention is to provide an efficient and non-destructive equalization method for a battery and a system thereof, aiming at achieving a balanced battery pack balancing purpose.

Problem solution

Technical solution

[0005] In order to achieve the above object, the present invention provides a high-efficiency lossless equalization method for a battery, wherein the method includes:

[0006] determining whether the battery cell is a discharge cell or a charging monomer according to a monomer information parameter of a battery cell in a battery;

[0007] the pair of the connection of the discharge cell connected to the charging unit is paired with the charging unit, and then connected to the equalization circuit unit for equalization maintenance; the equalization circuit unit is configured to be connected to the discharge cell Put An electrical control circuit, a charge control circuit coupled to the charge cell, and an isolated variable voltage control circuit coupled to the discharge control circuit and the charge control circuit.

In an embodiment of the present invention, the single information parameter includes a voltage, an internal resistance, and a speed of a voltage change; and determining, according to a single information parameter of a battery cell in the battery, whether the battery unit is The discharge monomer or charging monomer includes:

[0009] determining whether the voltage of the cell of the battery cell is lower than a lower limit of a normal range of the float voltage;

[0010] If yes, determining the battery cell as a charging monomer;

[0011] If not, determining whether the voltage of the battery cell is higher than an upper limit of a normal range of the float voltage;

[0012] If yes, it is determined whether the internal resistance of the battery cell is greater than an upper limit of an average horizontal range of all battery cells in the battery, or whether the speed of the voltage change is faster than other monomers during a large current charge and discharge maintenance process. ;

[0013] If yes, the battery cell is determined to be a discharge cell.

[0014] In an embodiment of the present invention, the step of connecting the connection of the discharge cell and the connection of the charging unit to the paired conduction access equalization circuit unit for equalization maintenance includes:

[0015] if the voltage connected to the discharge control circuit is a negative voltage relative to the discharge control circuit, the negative voltage is reverse processed;

[0016] If the voltage connected to the charge control circuit is a negative voltage with respect to the charge control circuit, the negative voltage is reverse processed.

[0017] In an embodiment of the present invention, the step of connecting the connection of the discharge cell and the connection of the charging unit to the paired conduction access equalization circuit unit for equalization maintenance includes:

[0018] sorting the discharge cells by voltage from high to low, and sorting the charging cells by voltage from low to high;

[0019] The switching of the connection of the discharge cells and the connection of the charging cells are performed in a paired conduction access equalization circuit unit for equalization maintenance.

[0020] In an embodiment of the present invention, the step of connecting the connection of the discharge cell and the connection of the charging unit to the paired conduction access equalization circuit unit for equalization maintenance includes:

[0021] determining whether there is a discharge cell or a charging monomer that cannot be paired;

[0022] If yes, after the balanced discharge of the paired discharge cells and the charging unit is completed, the unmatched The pair of discharge cells connected to the voltage and the voltage in the normal range of the floating charge voltage but the relatively low voltage of the connection of the single cell is connected to the equalization circuit unit for equalization maintenance; The charging unit is connected to the voltage and the voltage is within the normal range of the floating charging voltage, but the relatively high voltage of the single-cell connection is paired and connected to the equalization circuit unit for balanced maintenance.

[0023] In addition, in order to achieve the above object, the present invention further provides a battery high-efficiency lossless equalization system, which includes:

[0024] a monitoring judging unit configured to determine whether the battery cell is a discharge cell or a charging cell according to a cell information parameter of a battery cell in the battery;

[0025] the equalization circuit unit includes a discharge control circuit disposed to be coupled to the discharge cell, a charge control circuit disposed to be coupled to the charge cell, and an isolation change coupled to the discharge control circuit and the charge control circuit Pressure control circuit

[0026] The control switching group unit is configured to perform a balanced maintenance on the paired conduction access equalization circuit by connecting the switch connected to the charging unit to the charging unit.

[0027] In an embodiment of the invention, the single information parameter includes a voltage, an internal resistance, and a speed of the voltage change; the monitoring and determining unit is configured to:

[0028] determining whether the voltage of the cell of the battery cell is lower than a lower limit of a normal range of the float voltage;

[0029] If yes, determining the battery cell as a charging monomer;

[0030] If not, determining whether the voltage of the battery cell is higher than an upper limit of a normal range of the float voltage;

[0031] If yes, it is determined whether the internal resistance of the battery cell is greater than an upper limit of an average horizontal range of all battery cells in the battery, or whether the speed of the voltage change is faster than other monomers during a large current charge and discharge maintenance process. ;

[0032] If yes, the battery cell is determined to be a discharge cell.

[0033] In an embodiment of the present invention, the equalization circuit unit further includes:

[0034] a discharge reverse switch, connected to the discharge control circuit, configured to reversely process the negative voltage if a voltage connected to the discharge control circuit is a negative voltage relative to the discharge control circuit;

[0035] The charging reverse switch is connected to the charging control circuit, and is configured to reverse-process the negative voltage if the voltage connected to the charging control circuit is a negative voltage with respect to the charging control circuit.

[0036] In an embodiment of the present invention, the control switching group unit is configured to press the discharge unit The voltages are sorted from high to low, and the switches connecting the discharge cells and the charging cells are paired and connected to the equalization circuit unit for equalization maintenance.

[0037] In an embodiment of the present invention, the control switching group unit is further configured to:

[0038] determining whether there is a discharge cell or a charging monomer that cannot be paired;

[0039] If yes, after the paired discharge cells and the charging cells have been subjected to the balanced maintenance, the switching and voltage of the unmatchable discharge cells are within the normal range of the floating charging voltage but the voltage is relatively high. The low-cell connection is performed in a paired conduction access equalization circuit unit for equalization maintenance; the connection and voltage of the unmatchable charging unit are connected within a normal range of the floating charging voltage but the voltage is relatively high. The connection of the single unit is connected to the equalization circuit unit for equalization maintenance.

Advantageous effects of the invention

Beneficial effect

[0040] The high-efficiency non-destructive equalization method and system thereof for the battery provided by the present invention use a battery cell having a voltage higher than a certain range of the floating charging voltage as a power source, and a battery cell having a voltage lower than a certain range of the floating charging voltage as a load, a voltage The high battery cell charges the battery cell with low voltage through discharge, and the electric energy is directly transferred to the battery cell with low voltage in the battery cell with high voltage, so that the battery cell with high voltage realizes discharge equalization and the battery with low voltage The unit achieves charge equalization, efficiently achieves multi-cell balancing, and achieves the goal of battery pack equalization without loss.

Brief description of the drawing

DRAWINGS

1 is a schematic flow chart of a method for efficiently and non-destructively balancing a battery according to an embodiment of the present invention;

2 is a schematic diagram showing a process of determining a discharge cell and a charging cell in a method for efficiently performing non-destructive balancing of a battery according to an embodiment of the present invention;

3 is a schematic diagram of a voltage reversal flow of a battery efficient non-destructive equalization method according to an embodiment of the present invention;

4 is a schematic diagram of balanced maintenance of a paired discharge cell and a charging cell according to an embodiment of the present invention;

5 is a schematic structural diagram of a high-efficiency non-destructive equalization system of a battery according to an embodiment of the present invention;

6 is a schematic structural diagram of a battery efficient lossless equalization system according to an embodiment of the present invention;

7 is a schematic structural diagram of an equalization circuit unit in a high-efficiency lossless equalization system of a battery according to an embodiment of the present invention; [0048] The implementation, functional features, and advantages of the present invention will be further described with reference to the accompanying drawings.

Embodiments of the invention

[0049] It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0050] In the following description, the use of suffixes such as "module", "component" or "unit" set to indicate an element is merely for the purpose of facilitating the description of the present invention, and does not have a specific meaning per se. Therefore, "module" and "part" can be used in combination.

[0051] As shown in FIG. 1, an embodiment of a method for efficiently and non-destructively balancing a battery in an embodiment of the present invention includes the following steps:

[0052] Sl l, start;

[0053] S12, determining whether the battery cell is a discharge unit or a charging unit according to the monomer information parameter of the battery cell in the battery; if yes, proceeding to step S13; if not, proceeding to step S14;

[0054] wherein, the discharge cell refers to a battery cell whose battery cell voltage is too high and needs to be discharged and balanced by a load. The charging cell refers to a battery cell whose battery cell voltage is too low and needs to be charged and balanced by an external power source. Body

[0055] S13, the switch connecting the discharge cell and the charging cell are paired and connected to the equalization circuit unit for equalization maintenance; and the equalization circuit unit is configured to be disposed with the discharge cell a connected discharge control circuit, a charge control circuit connected to the charging unit, and an isolated variable voltage control circuit connected to the discharge control circuit and the charge control circuit;

[0056] Generally, a discharge cell is paired with a charging monomer, and the switching unit of the discharge cell can be connected to the charging cell through the equalizing circuit unit to realize the discharge cell to the charging monomer. The above-mentioned isolation transformer control circuit can play an electrical isolation function, thereby electrically isolating the two battery cells that are connected, and does not short circuit, causing a large current discharge or even burning the battery.

[0057] In addition, since it is impossible to know which battery cells in a group of batteries become discharge cells to be discharged, which battery cells become charging cells to be charged, it is impossible to design each battery cell. The charge and discharge channels of the cells to all other battery cells. Therefore, in this embodiment, each of the battery cells is connected to the discharge control circuit and the charge control circuit through the switch, and the closed or broken switches are closed.幵可 In order to control through the system, generally, the switches are in a constant state. In order to achieve equalization maintenance of the plurality of pairs of paired discharge cells and the charging unit, each of the battery cells can be connected to the discharge control circuit and the charging control circuit of the at least two equalization circuit units through the switch.

[0058] In another embodiment of the present invention, if the number of battery cells in the battery is too large, the battery cells can be divided into multiple groups, and only the battery cells in the group can be charged and discharged to each other;

[0059] S14, the end.

[0060] Optionally, based on the embodiment corresponding to FIG. 1 above, the second embodiment of the method for efficiently and non-destructively accumulating the battery provided by the embodiment of the present invention is as shown in FIG. 2, according to the single battery cell in the battery. The body information parameter determining whether the battery cell is a discharge cell or a charging monomer may include:

[0061] S21, starting;

[0062] S22, collecting monomer information parameters of the battery cells in the battery;

[0063] wherein, the monomer information parameter includes a voltage, an internal resistance, and a speed of a voltage change;

[0064] S23, collecting battery cell voltage by charging and discharging a battery with a large current to obtain a voltage change rate of the battery cell;

[0065] S24, determining whether the voltage of the cell of the battery cell is lower than the lower limit of the normal range of the float voltage; if yes, proceeding to step S25; if not, proceeding to step S26;

[0066] S25, determining the battery cell as a charging monomer;

[0067] S26, determining whether the voltage of the battery cell is higher than the upper limit of the normal range of the float voltage; if yes, proceeding to step S27; if not, determining the battery cell as normal as shown in step S29 monomer;

[0068] S27, determining whether the internal resistance of the battery cell is greater than an upper limit of an average horizontal range of all battery cells in the battery, or whether the speed of the voltage change is faster than other monomers during a large current charge and discharge maintenance process; If yes, proceed to step S28; if not, determine the battery cell as a normal monomer as shown in step S29;

[0069] S28, determining the battery cell as a discharge monomer;

[0070] S30, the end.

[0071] It can be seen that, in this embodiment, the discharge cell should satisfy the following conditions: the voltage is higher than the upper limit of the normal range of the float voltage, and the internal resistance is greater than the upper limit of the average level range of all the battery cells in the battery, or is large During current charging and discharging maintenance, the voltage changes faster than other monomers. Charging monomer should The following conditions are met: The battery cell voltage is lower than the float voltage range. Each time it is judged that the monomer requiring balanced maintenance may be a plurality of discharge cells and a charge monomer.

[0072] Optionally, based on the embodiment corresponding to FIG. 1 above, a third embodiment of the method for efficiently and non-destructively balancing the battery provided by the embodiment of the present invention, as shown in FIG. 3, is connected to the discharge unit. The connection between the switch and the charging unit is performed in a paired conduction access equalization circuit unit for equalization maintenance including:

[0073] S31, starting;

[0074] S32. Determine whether a voltage connected to the discharge control circuit is a negative voltage relative to the discharge control circuit.

If yes, go to step S33; if no, end the process as shown in step S36;

[0075] S33, performing reverse processing on the negative voltage;

[0076] S34. Determine whether a voltage connected to the charging control circuit is a negative voltage relative to the charging control circuit.

If yes, go to step S35; if no, end the process as shown in step S36;

[0077] S35, performing reverse processing on the negative voltage;

[0078] S36, the end.

[0079] In a specific implementation, it may be determined whether the negative voltage is a negative voltage by determining whether the discharge cell or the charging cell is an even number. Specifically, if the discharge cell connected to the discharge control circuit is an even number, it is negative. Voltage, if the discharge cell connected to the discharge control circuit is an odd-numbered node, it is a positive voltage; if the charging cell connected to the charge control circuit is an even-numbered node, it is a negative voltage, if the charging monomer of the charging control circuit is connected For odd sections, it is a positive voltage.

[0080] Optionally, based on the embodiment corresponding to FIG. 1 above, the fourth embodiment of the method for efficiently and non-destructively balancing the battery provided by the embodiment of the present invention, the switching unit and the charging unit connected to the discharge unit The connected switch performs the paired conduction access equalization circuit unit for equalization maintenance including:

[0081] sorting the discharge cells according to voltage from high to low, and sorting the charging cells according to voltage from low to high; connecting the discharge cells of the discharge cells to the charging cells The pairing is connected to the equalization circuit unit for equalization maintenance according to the sorting; the pairing 吋, the discharge of the discharge cell connection in the first position is paired with the connection of the charging unit in the first position. The equalization circuit unit is connected to perform equalization maintenance; the connection of the discharge cell connected in the second position is connected with the charging unit arranged in the second position, and the paired conduction access equalization circuit unit performs equalization maintenance; That is to say, the highest voltage discharge cell connection is connected to the lowest voltage charging cell, and the paired conduction access equalization circuit is single. The element is balanced and maintained. By analogy, the connection of the discharge cell with the second highest voltage and the connection of the charge cell with the second lowest voltage are connected to the equalization circuit unit for equalization maintenance.

[0082] Optionally, based on the embodiment corresponding to FIG. 1 above, the fifth embodiment of the method for efficiently and non-destructively balancing the battery provided by the embodiment of the present invention, the switching unit and the charging unit connected to the discharge unit The connected switch performs the paired conduction access equalization circuit unit for equalization maintenance including:

[0083] determining whether there is a discharge cell or a charging monomer that cannot be paired;

[0084] If yes, after the paired discharge cells and the charging cells have been subjected to the balanced maintenance, the switching and voltage of the unmatchable discharge cells are within the normal range of the floating charging voltage but the voltage is relatively high. The low-cell connection is performed in a paired conduction access equalization circuit unit for equalization maintenance; the connection and voltage of the unmatchable charging unit are connected within a normal range of the floating charging voltage but the voltage is relatively high. The connection of the single unit is connected to the equalization circuit unit for equalization maintenance.

[0085] More specifically, after the balanced discharge of the completed discharge cells and the charging cells is completed, the effect of the balanced maintenance is monitored, that is, the battery list is determined again according to the single information parameter of the battery cells in the battery. Whether the body is a discharge cell or a charging monomer; and pairing the discharge cell with the charging monomer, and then accessing the equalization circuit unit for equalization maintenance until no more discharge cells or charging cells or only one remaining The discharge cell or the charge cell needs to be balanced, and the enthalpy can be equalized in an average manner, that is, if the monomer is a discharge cell, the average charge of the monomer is in the floating charge range but the voltage is relatively high. The low monomer is discharged. Similarly, if the monomer is a charging monomer, the monomer is charged with a voltage in a floating charging range but a relatively high voltage.

Please refer to FIG. 4. FIG. 4 is a schematic diagram of balanced maintenance of a pair of discharge cells and a charging unit in the embodiment of the present invention; each battery cell is connected with a plurality of circuits provided with a gate, generally If it is n battery cells, the control switching group unit includes Sl~S2(n+l); by controlling the switching of these switches, the battery cells connected thereto can be connected to the charging control circuit or discharged. Control circuit. In addition, fuses F1 to F2n+1 can be provided on the circuit connected to the battery unit to protect the battery cells.

[0087] Since the voltage of the discharge cell connected to the discharge control circuit may be a reverse negative voltage with respect to the discharge control circuit, the discharge control circuit also needs to process the voltage direction and reversely process the negative voltage. In the example, the control is performed by switching the switches SW1 to SW2 to perform different conduction states. Similarly, the voltage of the charging unit connected to the charging control circuit may be a reverse negative voltage with respect to the charging control circuit. Therefore, the charging control circuit needs to process the voltage direction and reversely process the negative voltage. In this embodiment, it is realized by selecting the control switches SW3 to SW4 to perform different conduction states.

[0088] In this embodiment, the discharge cell N1 is paired with the charging cell Nn-1 for balanced maintenance. Thereafter, the control is turned on, S1, S3, the control switch SW1 is turned on to the left end, and the control switch SW2 is turned on to the right end, so that the discharge cell N1 is connected to the discharge control circuit; the control is turned on and off S2 (n) -1), S2n, select control S W3 to turn on the right end, select control switch SW4 to turn on the left end, so that the charging unit Nn-1 is connected to the charging control circuit. The specific discharge current flows from the positive electrode of the discharge cell N1 and flows back to the negative electrode to form a current loop. The energy of the discharge cell N1 is transmitted to the secondary side of the transformer in the isolation transformer primary circuit, and the charging current loop starts from the positive side of the secondary power supply of the transformer and flows to the positive terminal of the charging unit Nn-1.

[0089] The battery efficient high-lossless equalization method in the embodiment of the present invention has been described above, and the battery efficient non-destructive equalization system in the embodiment of the present invention will be described below.

As shown in FIG. 5, a sixth embodiment of the present invention provides a battery high-efficiency lossless equalization system, including a monitoring and determining unit 10, an equalizing circuit unit 20, and a control switching group unit 30; wherein:

[0091] The monitoring judging unit 10 is configured to determine whether the battery cell is a discharge cell or a charging cell according to a cell information parameter of a battery cell in the battery; wherein, the discharging cell refers to a battery cell voltage that is too high A battery cell that is discharged and balanced by a load. A charging cell refers to a battery cell whose battery cell voltage is too low and needs to be charged and balanced by an external power source.

[0092] The equalization circuit unit 20 includes a discharge control circuit disposed to be coupled to the discharge cell, a charge control circuit disposed to be coupled to the charge cell, and an isolation change coupled to the discharge control circuit and the charge control circuit Pressure control circuit

[0093] Generally, a discharge cell is paired with a charging cell, and the discharge cell can be connected in parallel with the charging cell through the equalization circuit unit to realize charging of the charging cell by the discharging cell; the above-mentioned isolation transformer control circuit It can play an electrical isolation function, so that the two battery cells connected are electrically isolated without short circuit, causing large current discharge or even burning the battery. The design knows which cells in a battery will become high voltage and which will become low voltage.

[0094] The control switching group unit 30 is configured to perform a balanced maintenance on the paired conduction access equalization circuit by connecting the connection of the discharge cell to the charging unit.

[0095] Due to the design flaw, it is impossible to know which battery cells in a group of batteries will become discharge cells, which battery sheets The experience becomes a charging unit, and it is impossible to design a charging and discharging channel for each of the battery cells to all of the battery cells. Therefore, in this embodiment, the control switching group unit includes a plurality of groups, and is used for Each of the battery cells is separately connected to the discharge control circuit and the charge control circuit. Generally, the switches are in a normal state. In order to achieve equalization maintenance of the plurality of pairs of paired discharge cells and the charging unit, each of the battery cells can be connected to the discharge control circuit and the charging control circuit of the at least two equalization circuit units through the switch.

[0096] As shown in FIG. 6, in another embodiment of the present invention, if the number of battery cells in the battery 40 is too large, the battery cells can be divided into multiple groups, and thus multiple sets of control switches are required. The group unit 30 and the equalization circuit unit 20; only the discharge cells 41 and the charge cells 42 in the battery cells in the group can be charged and discharged to each other.

The seventh embodiment of the present invention provides a battery efficient non-destructive equalization system, including a monitoring and determining unit 10, an equalizing circuit unit 20, and a control switching group unit 30.

[0098] The monitoring judging unit 10, the equalizing circuit unit 20, the control switching group unit 30, and the monitoring judging unit 10, the equalizing circuit unit 20, and the control switching group unit 30 in the sixth embodiment are provided in the present embodiment. The same, as described above, will not be described here.

[0099] The difference is that, in this embodiment, the single information parameter includes a voltage, an internal resistance, and a speed of the voltage change; the monitoring and determining unit is configured to:

[0100] determining whether the voltage of the cell of the battery cell is lower than a lower limit of a normal range of the float voltage;

[0101] If yes, determining the battery cell as a charging monomer;

[0102] If not, determining whether the voltage of the battery cell is higher than an upper limit of a normal range of the float voltage;

[0103] If yes, it is determined whether the internal resistance of the battery cell is greater than an upper limit of an average horizontal range of all battery cells in the battery, or whether the speed of the voltage change is faster than other monomers during a large current charge and discharge maintenance process. ;

[0104] If yes, the battery cell is determined to be a discharge cell.

[0105] That is to say, the discharge cell should satisfy the following conditions: The voltage is higher than the upper limit of the normal range of the float voltage, and the internal resistance is greater than the upper limit of the average level range of all the battery cells in the battery, or stored or discharged at a large current. During maintenance, the voltage changes faster than other cells. The charging cell should meet the following conditions: The voltage is lower than the lower limit of the normal range of the float voltage. Each time it is judged that the monomer requiring balanced maintenance may be a plurality of discharge cells and a charging monomer. The eighth embodiment of the present invention provides a battery high-efficiency lossless equalization system, including a monitoring and determining unit 10, an equalizing circuit unit 20, and a control switching group unit 30.

[0107] The monitoring judging unit 10, the equalizing circuit unit 20, the control switching group unit 30, and the monitoring judging unit 10, the equalizing circuit unit 20, and the control switching group unit 30 in the sixth embodiment are provided in the present embodiment. The same, as described above, will not be described here.

[0108] In the present embodiment, as shown in FIG. 7, the equalization circuit unit 20 includes, in addition to the discharge control circuit 21 disposed to be connected to the discharge cell, and is configured to be connected to the charging unit. Control circuit 2

3 and an isolation transformer control circuit 22 connected to the discharge control circuit 21 and the charge control circuit 23

, Also includes:

[0109] a discharge reverse switch 24 connected to the discharge control circuit 21, configured to reverse the negative voltage if a voltage connected to the discharge control circuit is a negative voltage with respect to the discharge control circuit deal with;

[0110] a charge reverse switch 25 connected to the charge control circuit 23, configured to invert the negative voltage if a voltage connected to the charge control circuit is a negative voltage with respect to the charge control circuit deal with.

[0111] Taking FIG. 4 as an example, the selection control switches SW1 to SW2 are the discharge reverse switches 24; the selection control switches SW 3 to SW4 are the charge reverse switches 25.

[0112] In a specific implementation, whether a negative voltage is determined by determining whether the discharge cell or the charging cell is an even number, specifically, if the discharge cell connected to the discharge control circuit is an even number, it is negative. Voltage, if the discharge cell connected to the discharge control circuit is an odd-numbered node, it is a positive voltage; if the charging cell connected to the charge control circuit is an even-numbered node, it is a negative voltage, if the charging monomer of the charging control circuit is connected For odd sections, it is a positive voltage.

[0113] A ninth embodiment of the present invention provides a battery efficient non-destructive equalization system, including a monitoring and determining unit 10, an equalizing circuit unit 20, and a control switching group unit 30.

[0114] The monitoring judging unit 10, the equalizing circuit unit 20, the control switching group unit 30, and the monitoring judging unit 10, the equalizing circuit unit 20, and the control switching group unit 30 in the sixth embodiment are provided in the present embodiment. The same, as described above, will not be described here.

[0115] The difference is that, in this embodiment, the control switching group unit is further configured to sort the discharge cells from high to low, and connect the discharge cells to the charging and charging list. The connection of the body connection is performed in a paired conduction access equalization circuit unit for equalization maintenance; the pairing 吋, the discharge in the first place The connection of the single unit is connected with the charging unit connected in the first place to perform the equalization and maintenance of the paired conduction equalization circuit unit; the connection of the discharge unit in the second position is ranked The two-way charging unit is connected to the paired conduction access equalization circuit unit for equalization maintenance; that is, the connection of the highest voltage discharge cell connection and the lowest voltage charging cell are connected. The equalization circuit unit is connected to perform equalization maintenance. By analogy, the connection of the discharge cell with the second highest voltage and the connection of the charge cell with the second lowest voltage are connected to the equalization circuit unit for equalization maintenance.

The tenth embodiment of the present invention provides a battery efficient non-destructive equalization system, including a monitoring and determining unit 10, an equalizing circuit unit 20, and a control switching group unit 30.

[0117] The monitoring judging unit 10, the equalizing circuit unit 20, the control switching group unit 30, and the monitoring judging unit 10, the equalizing circuit unit 20, and the control switching group unit 30 in the sixth embodiment are provided in the present embodiment. The same, as described above, will not be described here.

[0118] The difference is that, in this embodiment, the control switching group unit is further configured to: determine whether there is an unmatched discharge cell or a charging cell;

[0119] If yes, after the paired discharge cells and the charging cells have been subjected to the balanced maintenance, the switching and voltage of the unmatchable discharge cells are within the normal range of the floating charging voltage but the voltage is relatively high. The low-cell connection is performed in a paired conduction access equalization circuit unit for equalization maintenance; the connection and voltage of the unmatchable charging unit are connected within a normal range of the floating charging voltage but the voltage is relatively high. The connection of the single unit is connected to the equalization circuit unit for equalization maintenance.

[0120] More specifically, after the completed paired discharge cells and the charging cells are balanced and maintained, the effect of the balanced maintenance is monitored, that is, the battery list is determined again according to the monomer information parameters of the battery cells in the battery. Whether the body is a discharge cell or a charging monomer; and pairing the discharge cell with the charging monomer, and then accessing the equalization circuit unit for equalization maintenance until no more discharge cells or charging cells or only one remaining The discharge cell or the charge cell needs to be balanced, and the enthalpy can be equalized in an average manner, that is, if the monomer is a discharge cell, the average charge of the monomer is in the floating charge range but the voltage is relatively high. The low monomer is discharged. Similarly, if the monomer is a charging monomer, the monomer is charged with a voltage in a floating charging range but a relatively high voltage.

[0121] The high-efficiency non-destructive equalization method and system of the battery provided by the invention can reduce the energy consumption of the battery pack equalization, and transfer the energy of the battery unit discharge to the battery unit that needs to be charged. Peer to improve the equilibrium dimension Protection efficiency.

Industrial applicability

[0122] The high-efficiency non-destructive equalization method and system of the battery proposed by the present invention, by judging the performance of the battery, select a battery cell, that is, a charging cell and a discharge cell, which need to be balanced. By switching the switching control, the charging unit and the discharging unit are respectively connected to the charging control circuit and the discharging control circuit, and the control is performed to equalize the discharge of the discharge cells and charge the charging unit to achieve the energy consumption reduction. the goal of. In addition, in order to improve the efficiency of balanced maintenance, while maintaining multi-cell batteries, the battery cells that need to be maintained can be switched to multiple equalization circuits through multiple switching groups to perform maintenance.

[0123] It is to be noted that the terms "comprising", "including", or any other variants thereof are intended to encompass a non-exclusive inclusion, such that a process, method, article, or device that comprises a Those elements, but also other elements not explicitly listed, or elements that are inherent to such a process, method, item or device. An element defined by the phrase "comprises a ..." without further restrictions does not exclude the presence of additional elements in the process, method, article, or device that comprises the element.

[0124] The foregoing serial numbers of the embodiments of the present invention are merely for the description, and do not represent the advantages and disadvantages of the embodiments.

[0125] Through the description of the above embodiments, those skilled in the art can clearly understand that the foregoing method can be implemented by means of software plus a necessary general hardware platform, and of course, can also be through hardware, but in many cases the former It is a better implementation. Based on such understanding, the technical solution of the present invention, which is essential or contributes to the prior art, may be embodied in the form of a software product stored in a storage medium (such as ROM/RAM, disk, The optical disc includes a number of instructions for causing a terminal device (which may be a mobile phone, a computer, a server, an air conditioner, or a network device, etc.) to perform the methods described in various embodiments of the present invention.

The above are only the preferred embodiments of the present invention, and are not intended to limit the scope of the invention, and the equivalent structure or equivalent process transformations made by the description of the present invention and the drawings are used directly or indirectly in other related technical fields. The same is included in the scope of patent protection of the present invention.

Claims

Claim

[Claim 1] A method for efficient non-destructive balancing of a battery, wherein the method includes:

Determining whether the battery cell is a discharge cell or a charging monomer according to a monomer information parameter of a battery cell in the battery;

Performing equalization maintenance on the connection of the connection of the discharge cell and the connection of the charging unit to the equalization conduction circuit unit for equalization maintenance; the equalization circuit unit includes a discharge control circuit disposed to be connected to the discharge cell And a charging control circuit connected to the charging unit and an isolated variable voltage control circuit connected to the discharging control circuit and the charging control circuit.

The method of claim 1 , wherein the single information parameter includes a voltage, an internal resistance, and a speed of the voltage change; Determining whether the battery cell is a discharge cell or a charging monomer comprises:

Determining whether the voltage of the monomer of the battery cell is lower than a lower limit of a normal range of the float voltage; if so, determining the battery cell as a charging monomer;

If not, it is determined whether the voltage of the battery cell is higher than the upper limit of the normal range of the float voltage

If yes, it is determined whether the internal resistance of the battery cell is greater than an upper limit of an average level range of all battery cells in the battery, or whether the speed of the voltage change is faster than other monomers during a large current charge and discharge maintenance process;

If so, the battery cell is determined to be a discharge cell.

[Claim 3] The high-efficiency non-destructive equalization method of the battery according to claim 1, wherein the switching of the connection of the discharge cell and the connection of the charging unit is performed by a paired conduction access equalization circuit unit Balanced maintenance includes:

If the voltage connected to the discharge control circuit is a negative voltage with respect to the discharge control circuit, the negative voltage is reversely processed;

If the voltage connected to the charge control circuit is a negative voltage with respect to the charge control circuit, the negative voltage is reverse processed.

[Claim 4] The high-efficiency non-destructive equalization method of the battery according to claim 1, wherein the switching of the connection of the discharge cell and the connection of the charging unit is performed by a paired conduction access equalization circuit unit Balanced maintenance includes:

Sorting the discharge cells according to voltage from high to low, and sorting the charging cells according to voltage from low to high;

The switches connecting the discharge cells and the charging cells are paired and connected to the equalization circuit unit for equalization maintenance.

[Claim 5] The high-efficiency non-destructive equalization method of the battery according to claim 1 or 4, wherein the switching of the connection of the discharge cell and the connection of the charging unit are performed in a paired conduction access equalization circuit Units for balanced maintenance include:

Determining whether there is a discharge cell or a charging monomer that cannot be paired; if yes, after the completed discharge cell and the charging cell complete the balanced maintenance, the connection and voltage of the unmatchable discharge cell are connected The connection of the cell connection in the normal range of the floating charge voltage but the relatively low voltage is connected to the equalization circuit unit for equalization maintenance; the switching and voltage connection of the unmatchable charging unit are floated The connection of the cells in the normal range of the voltage but the relatively high voltage is connected to the equalization circuit unit for equalization maintenance.

[Claim 6] A battery efficient non-destructive equalization system, wherein:

The monitoring judging unit is configured to determine whether the battery cell is a discharge cell or a charging cell according to a cell information parameter of the battery cell in the battery;

The equalization circuit unit includes a discharge control circuit disposed to be coupled to the discharge cell, a charge control circuit disposed to be coupled to the charge cell, and an isolated variable voltage control circuit coupled to the discharge control circuit and the charge control circuit ;

The control switching group unit is configured to perform a balanced maintenance on the paired conduction access equalization circuit for connecting the connection of the discharge unit to the charging unit.

[Claim 7] The battery efficient non-destructive equalization system according to claim 6, wherein the single information parameter includes a voltage, an internal resistance, and a speed of a voltage change; the monitoring and determining unit is configured to: Determining whether the voltage of the monomer of the battery cell is lower than a lower limit of a normal range of the float voltage; if so, determining the battery cell as a charging monomer;

If not, determining whether the voltage of the battery cell is higher than an upper limit of a normal range of the float voltage, if yes, determining whether the internal resistance of the battery cell is greater than an upper limit of an average horizontal range of all battery cells in the battery, or During the high current charge and discharge maintenance process, the voltage changes faster than other monomers;

If so, the battery cell is determined to be a discharge cell.

[Claim 8] The battery efficient high-density equalization system according to claim 6, wherein the equalization circuit unit further comprises:

Discharging a reverse switch, connected to the discharge control circuit, configured to reversely process the negative voltage if a voltage connected to the discharge control circuit is a negative voltage relative to the discharge control circuit;

A charge reverse switch is coupled to the charge control circuit to set the negative voltage to be reverse processed if the voltage applied to the charge control circuit is a negative voltage relative to the charge control circuit.

[Claim 9] The battery efficient non-destructive equalization system according to claim 6, wherein the control switching group unit is configured to sort the discharge cells from high to low, and discharge the discharge The connection between the unit connection and the charging unit is matched and matched to the equalization circuit unit for equalization maintenance.

[Claim 10] The battery efficient non-destructive equalization system according to claim 6 or 9, wherein the control switching group unit is further configured to:

Determining whether there is a discharge cell or a charging monomer that cannot be paired; if yes, after the completed discharge cell and the charging cell complete the balanced maintenance, the connection and voltage of the unmatchable discharge cell are connected The connection of the cell connection in the normal range of the floating charge voltage but the relatively low voltage is connected to the equalization circuit unit for equalization maintenance; the switching and voltage connection of the unmatchable charging unit are floated Paired conduction in the normal range of pressure but relatively high voltage connection The equalization circuit unit is used for equalization maintenance.