CN110994712B - Active equalization system and active equalization method for battery pack - Google Patents

Active equalization system and active equalization method for battery pack Download PDF

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Publication number
CN110994712B
CN110994712B CN201911157401.7A CN201911157401A CN110994712B CN 110994712 B CN110994712 B CN 110994712B CN 201911157401 A CN201911157401 A CN 201911157401A CN 110994712 B CN110994712 B CN 110994712B
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battery
voltage
battery pack
active equalization
main controller
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CN110994712A (en
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宋殿权
马立双
田庆锋
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Harbin Guangyu Electronics Co ltd
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Harbin Coslight Power Co ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
    • H02J7/0014—Circuits for equalisation of charge between batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/4207—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells for several batteries or cells simultaneously or sequentially
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/44—Methods for charging or discharging
    • H01M10/441—Methods for charging or discharging for several batteries or cells simultaneously or sequentially
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
    • H01M10/482—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for several batteries or cells simultaneously or sequentially
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
    • H02J7/0014—Circuits for equalisation of charge between batteries
    • H02J7/0019—Circuits for equalisation of charge between batteries using switched or multiplexed charge circuits
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
    • H01M2010/4271—Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Abstract

A battery pack active equalization system and an active equalization method relate to the field of power batteries. The problem of because there is the difference of electrical property in the battery monomer in the group battery, lead to the poor charge-discharge performance of whole group battery is solved. The system comprises a main controller, N execution units and a battery pack; each execution unit comprises an active equalization execution device and a battery voltage acquisition device; the battery pack includes N battery modules connected in series; the N execution units are respectively used for carrying out voltage acquisition and voltage equalization on the N battery modules; the battery voltage acquisition device in each execution unit is used for acquiring the voltage of all the battery monomers in the corresponding battery module and sending the acquired voltage result to the main controller, the main controller sends a control instruction according to the received voltage result, and the active equalization execution device performs voltage equalization on the battery monomers in the corresponding battery module according to the received control instruction. The voltage equalization is mainly performed on the battery pack.

Description

Active equalization system and active equalization method for battery pack
Technical Field
The invention relates to the field of power batteries, in particular to an active equalization framework and an equalization method of a battery system, a brand new design concept and an implementation method.
Background
The power battery system adopted at present mainly adopts lithium iron phosphate batteries, ternary batteries and other types of batteries. The battery is widely applied to the fields of new energy automobiles, energy storage and electric vehicles. Due to the limitation of the production process, the electrical properties of the single battery cell (i.e., the single battery cell) are different, i.e., the uniformity of the battery is inconsistent. In the use process, the voltage difference of the single battery cell is larger and larger due to continuous charging and discharging, so that the charging and discharging performance of the whole battery is influenced, and the whole capacity of the battery and the service life of the battery are greatly influenced. The above problems need to be solved.
Disclosure of Invention
The invention provides an active equalization system and an active equalization method for a battery pack, aiming at solving the problem that the charging and discharging performance of the whole battery pack is poor due to the difference of the electrical performance of battery monomers in the battery pack.
The battery pack active equalization system comprises a main controller, N execution units and a battery pack;
each execution unit comprises an active equalization execution device and a battery voltage acquisition device;
the battery pack comprises N battery modules connected in series, and each battery module is formed by connecting M battery monomers in series; n and M are integers;
the N execution units are respectively used for carrying out voltage acquisition and voltage equalization on the N battery modules;
the battery voltage acquisition device in each execution unit is used for acquiring the voltage of all the battery monomers in the corresponding battery module and sending the acquired voltage result to the main controller, the main controller sends a control instruction according to the received voltage result to control the active equalization execution device in the execution unit, and the active equalization execution device performs voltage equalization on the battery monomers in the corresponding battery module according to the received control instruction.
Preferably, the type of the battery cell in each battery module is a lithium iron phosphate battery or a ternary battery.
Preferably, the main controller performs information interaction with the N execution units in a CAN communication manner.
Preferably, each active equalization execution device supplements power to the corresponding battery monomer to be equalized by controlling one or two of the power supply modes of the external power supply and the power supply modes of the battery module corresponding to the active equalization execution device;
each active equalization execution device discharges the corresponding battery monomer to be equalized and discharged through one or two discharging modes of resistance discharging and energy conversion between the battery monomer to be equalized and the corresponding battery module.
The active equalization method realized by adopting the battery pack active equalization system comprises the following steps:
step one, marking single batteries with balanced conditions in a battery pack, wherein the marked types comprise balanced charging and balanced discharging;
under the condition that the condition I and the condition II are met, acquiring the voltages of all battery monomers in the corresponding battery modules through all battery voltage acquisition devices, and sending acquired voltage results to a main controller, wherein the main controller calculates according to the received voltage results to obtain the number 1 average voltage of the battery pack and the maximum voltage difference between all the battery monomers in the battery pack;
the first condition is as follows: under the charging mode of each battery module, each battery monomer has charging current, and the charging time is longer than the preset time;
the second condition is as follows: at the end of charge time of each battery module;
the last charging stage time of each battery module is the time corresponding to the charging voltage of any battery monomer in the battery module reaching the cut-off voltage and the charging current reaching the preset current;
step three, when the maximum pressure difference between all the battery monomers in the battery pack is greater than a threshold value Y1, carrying out equalizing charge or equalizing discharge on all the battery monomers to be equalized in the battery pack under the condition that a condition one and a condition two are met;
in the first case:
respectively subtracting the voltage of all the battery monomers in each battery module from the average voltage No. 1 of the battery pack to obtain N difference values, and respectively comparing the N difference values with a threshold value Y2;
when the difference is greater than the threshold value Y2 and the battery cell corresponding to the difference is the battery cell marked as equalizing charge in the step one, the main controller sends a charge control instruction to the corresponding active equalizing execution device, and the active equalizing execution device charges the battery cell marked as equalizing charge according to the received charge control instruction until the voltage of the battery cell reaches the threshold voltage Y3 or the equalizing charge time of the battery cell reaches the preset equalizing time T1, so that the charging operation of all the battery cells to be equalized charge in the battery pack is realized;
in the second case:
subtracting the average voltage No. 1 of the battery pack from the voltage of all the battery monomers in each battery module to obtain N difference values, and comparing the N difference values with a threshold value Y4 respectively;
when the difference is greater than the threshold value Y4 and the battery cell corresponding to the difference is the battery cell marked as balanced discharge in the step one, the main controller sends a discharge control instruction to the corresponding active balance execution device, and the active balance execution device discharges the battery cell marked as balanced discharge according to the received discharge control instruction until the voltage of the battery cell reaches the threshold voltage Y5 or the balanced discharge time of the battery cell reaches the preset balance time T2, so that the discharge operation of all the battery cells to be balanced discharged in the battery pack is realized.
Preferably, in the step one, the specific process of marking the battery cells having the equilibrium condition in the battery pack is as follows:
the method comprises the following steps that a battery pack active equalization system is electrified at low voltage, and under the condition that a battery pack is in a charging mode, a main controller obtains No. 2 average voltage of the battery pack according to the voltage of all battery monomers in the battery pack;
subtracting the average voltage No. 2 from the voltage of all the battery monomers in the battery pack to obtain M × N difference values, and when the difference value is greater than a threshold value Y6, marking the battery monomer corresponding to the difference value and marking the battery monomer as balance discharge, wherein the threshold value Y6 is greater than 0;
respectively subtracting the voltages of all battery monomers in the battery pack from the average voltage No. 2 to obtain M x N difference values, and marking the battery monomer corresponding to the difference value as balanced charging when the difference value is greater than a threshold value Y7, wherein the threshold value Y7 is greater than 0;
thereby completing the marking of the battery cells having the equalization condition in the battery pack.
The active equalization system and the active equalization method for the battery pack have the advantages that the system is simple in structure, the processing flow of the equalization method is simple, all battery monomers to be charged and discharged in the battery pack can be subjected to voltage equalization, the overall performance of the battery pack is improved, and the service life of the battery pack is prolonged.
Drawings
Fig. 1 is a schematic diagram of an active equalization system of a battery pack according to the present invention;
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The invention is further described with reference to the following drawings and specific examples, which are not intended to be limiting.
Referring to fig. 1, the active equalization system of the battery pack according to the present embodiment includes a main controller 100, N execution units 200, and a battery pack 300;
each execution unit 200 comprises an active equalization execution device 210 and a battery voltage acquisition device 220;
the battery pack 300 includes N battery modules 310 connected in series, and each battery module 310 is formed by connecting M battery cells in series; n and M are integers;
the N execution units 200 are respectively configured to perform voltage acquisition and voltage equalization on the N battery modules 310;
the battery voltage collecting device 220 in each execution unit 200 is configured to collect voltages of all battery cells in the corresponding battery module 310, and send a collected voltage result to the main controller 100, the main controller 100 sends a control instruction according to the received voltage result to control the active equalization execution device 210 in the execution unit 200, and the active equalization execution device 210 performs voltage equalization on the battery cell in the corresponding battery module 310 according to the received control instruction.
In this embodiment, the battery cells of the battery module 310 are lithium iron phosphate batteries, ternary batteries or other types of batteries, and in a specific operation process, the voltages of all the battery cells to be balanced may be balanced, so that the voltages of all the battery cells in the battery pack 300 are consistent, and the overall performance of the battery pack 300 is improved.
Further, the main controller 100 performs information interaction with the N execution units 200 in a CAN communication manner.
Further, each active equalization execution device 210 supplements power to the corresponding battery cell to be equalized by controlling one or both of the power supply of the external power source and the power supply of the corresponding battery module 310.
The voltage of the battery monomer with the excessively low monomer voltage is improved to a certain extent and reaches an integral average voltage platform, so that good uniformity is achieved, vicious circle that the battery monomer is lower and lower along with continuous discharge cycle voltage is eliminated, and the voltage consistency of the battery monomer is improved.
Further, each active equalization performing device 210 discharges the corresponding battery cell to be equalized and discharged through one or two discharging manners of resistance discharging and controlling energy conversion between the battery cell to be equalized and the corresponding battery module 310.
The voltage of the battery monomer with the over-high monomer voltage is reduced to a certain extent and reaches an integral average voltage platform, so that good uniformity is achieved. The vicious circle that the voltage of the battery monomer is higher and higher along with the continuous charging circulation is eliminated, and the voltage consistency of the battery core is improved.
Referring to fig. 1, an active equalization method implemented by the active equalization system for a battery pack according to this embodiment is described, where the equalization method includes the following steps:
step one, marking single batteries with balanced conditions in the battery pack 300, wherein the marked types comprise balanced charging and balanced discharging;
step two, under the condition that the condition one and the condition two are met, acquiring the voltages of all the battery monomers in the corresponding battery module 310 through all the battery voltage acquisition devices 220, and sending the acquired voltage results to the main controller 100, wherein the main controller 100 calculates according to the received voltage results to obtain the number 1 average voltage of the battery pack 300 and the maximum voltage difference between all the battery monomers in the battery pack 300;
the first condition is as follows: in the charging mode of each battery module 310, each battery cell has a charging current, and the charging time is longer than the preset time;
the second condition is as follows: at the end of charge time of each battery module 310;
the last charging stage time of each battery module 310 is a time corresponding to the charging voltage of any battery cell in the battery module 310 reaching a cut-off voltage and the charging current reaching a preset current;
step three, when the maximum pressure difference between all the battery cells in the battery pack 300 is greater than a threshold value Y1, performing equalizing charge or equalizing discharge on all the battery cells to be equalized in the battery pack 300 under the condition that a condition one and a condition two are met;
in the first case:
subtracting the voltages of all the battery monomers in each battery module 310 from the average voltage No. 1 of the battery pack 300 respectively to obtain N difference values, and comparing the N difference values with a threshold value Y2 respectively;
when the difference is greater than the threshold Y2 and the battery cell corresponding to the difference is the battery cell marked as equalizing charge in the step one, the main controller 100 sends a charge control instruction to the corresponding active equalization execution device 210, and the active equalization execution device 210 charges the battery cell marked as equalizing charge according to the received charge control instruction until the voltage of the battery cell reaches the threshold voltage Y3 or the equalizing charge time of the battery cell reaches the preset equalizing time T1, thereby implementing the charging operation on all the battery cells to be equalized charge in the battery pack 300;
in the second case:
subtracting the average voltage No. 1 of the battery pack 300 from the voltages of all the battery cells in each battery module 310 to obtain N difference values, and comparing the N difference values with a threshold value Y4 respectively;
when the difference is greater than the threshold Y4 and the battery cell corresponding to the difference is the battery cell marked as balanced discharge in the step one, the main controller 100 sends a discharge control instruction to the corresponding active balance executing device 210, and the active balance executing device 210 discharges the battery cell marked as balanced discharge according to the received discharge control instruction until the voltage of the battery cell reaches the threshold voltage Y5 or the balanced discharge time of the battery cell reaches the preset balance time T2, thereby implementing the discharge operation of all the battery cells to be balanced discharged in the battery pack 300.
In this embodiment, the threshold voltage Y3 and the threshold voltage Y5 are both obtained from the number 1 average voltage of the battery pack 300, and the specific process of the active balancing method can balance the voltages of all the battery cells to be balanced, so that the voltages of all the battery cells in the battery pack 300 are consistent, and the overall performance of the battery pack 300 is improved.
Further, in the active balancing method, in the first step, the specific process of marking the battery cells having the balancing condition in the battery pack 300 is as follows:
the battery pack active equalization system is powered on at low voltage, and under the condition that the battery pack 300 is in a charging mode, the main controller 100 obtains the number 2 average voltage of the battery pack 300 according to the voltages of all battery monomers in the battery pack 300;
subtracting the average voltage No. 2 from the voltages of all the battery cells in the battery pack 300 to obtain M × N difference values, and when the difference values are greater than a threshold value Y6, marking the battery cells corresponding to the difference values and marking the battery cells as balanced cells, wherein the threshold value Y6 is greater than 0;
respectively subtracting the voltages of all the battery cells in the battery pack 300 from the average voltage No. 2 to obtain M × N difference values, and when the difference value is greater than a threshold value Y7, marking the battery cell corresponding to the difference value and marking the battery cell as balanced charging, wherein the threshold value Y7 is greater than 0;
thereby completing the labeling of the battery cells having the equalization condition in the battery pack 300.
In the present embodiment, the cells that are not labeled in the battery pack 300 are cells that do not require equalization.
Although the invention herein has been described with reference to particular embodiments, it is to be understood that these embodiments are merely illustrative of the principles and applications of the present invention. It is therefore to be understood that numerous modifications may be made to the illustrative embodiments and that other arrangements may be devised without departing from the spirit and scope of the present invention as defined by the appended claims. It should be understood that features described in different dependent claims and herein may be combined in ways different from those described in the original claims. It is also to be understood that features described in connection with individual embodiments may be used in other described embodiments.

Claims (4)

1. The active equalization method is realized by adopting a battery pack active equalization system, wherein the battery pack active equalization system comprises a main controller (100), N execution units (200) and a battery pack (300);
each execution unit (200) comprises an active equalization execution device (210) and a battery voltage acquisition device (220);
the battery pack (300) comprises N battery modules (310) connected in series, wherein M battery units are connected in series in each battery module (310); n and M are integers;
the N execution units (200) are respectively used for carrying out voltage acquisition and voltage equalization on the N battery modules (310);
the battery voltage acquisition device (220) in each execution unit (200) is used for acquiring the voltage of all battery monomers in the corresponding battery module (310) and sending the acquired voltage result to the main controller (100), the main controller (100) sends a control instruction according to the received voltage result to control the active equalization execution device (210) in the execution unit (200), and the active equalization execution device (210) performs voltage equalization on the battery monomers in the corresponding battery module (310) according to the received control instruction;
the method is characterized by comprising the following steps:
step one, marking single batteries with balanced conditions in a battery pack (300), wherein the marked types comprise balanced charging and balanced discharging;
under the condition that the condition I and the condition II are met, acquiring the voltages of all battery monomers in the corresponding battery module (310) through all battery voltage acquisition devices (220), and sending the acquired voltage results to the main controller (100), wherein the main controller (100) calculates according to the received voltage results to obtain the number 1 average voltage of the battery pack (300) and the maximum voltage difference between all the battery monomers in the battery pack (300);
the first condition is as follows: in the charging mode of each battery module (310), each battery monomer has charging current, and the charging time is longer than the preset time;
the second condition is as follows: at the end of charge time of each battery module (310);
the last charging stage time of each battery module (310) is the time corresponding to the charging voltage of any battery monomer in the battery module (310) reaching the cut-off voltage and the charging current reaching the preset current;
step three, when the maximum pressure difference among all the battery cells in the battery pack (300) is greater than a threshold value Y1, carrying out equalizing charge or equalizing discharge on all the battery cells to be equalized in the battery pack (300) under the condition that a condition I and a condition II are met;
in the first case:
subtracting the voltage of all battery monomers in each battery module (310) from the average voltage No. 1 of the battery pack (300) respectively to obtain N difference values, and comparing the N difference values with a threshold value Y2 respectively;
when the difference is greater than the threshold value Y2 and the battery cell corresponding to the difference is the battery cell marked as equalizing charge in the step one, the main controller (100) sends a charge control instruction to the corresponding active equalization execution device (210), and the active equalization execution device (210) charges the battery cell marked as equalizing charge according to the received charge control instruction until the voltage of the battery cell reaches the threshold voltage Y3 or the equalizing charge time of the battery cell reaches the preset equalizing time T1, so that the charging operation of all the battery cells to be equalized charge in the battery pack (300) is realized;
in the second case:
subtracting the average voltage No. 1 of the battery pack (300) from the voltage of all the battery monomers in each battery module (310) to obtain N difference values, and comparing the N difference values with a threshold value Y4 respectively;
when the difference is greater than the threshold value Y4 and the battery cell corresponding to the difference is the battery cell marked as balanced discharge in the step one, the main controller (100) sends a discharge control instruction to the corresponding active balance execution device (210), and the active balance execution device (210) discharges the battery cell marked as balanced discharge according to the received discharge control instruction until the voltage of the battery cell reaches the threshold voltage Y5 or the balanced discharge time of the battery cell reaches the preset balance time T2, so that the discharge operation of all the battery cells to be balanced discharged in the battery pack (300) is realized;
in the first step, a specific process of marking the battery cells with the balance condition in the battery pack (300) is as follows:
the method comprises the steps that a battery pack active equalization system is electrified at low voltage, and under the condition that a battery pack (300) is in a charging mode, a main controller (100) obtains the number 2 average voltage of the battery pack (300) according to the voltages of all battery monomers in the battery pack (300);
subtracting the average voltage No. 2 from the voltage of all the battery cells in the battery pack (300) to obtain M × N difference values, and when the difference values are larger than a threshold value Y6, marking the battery cells corresponding to the difference values and marking the battery cells into balance cells, wherein the threshold value Y6 is larger than 0;
respectively subtracting the voltages of all the battery monomers in the battery pack (300) from the average voltage No. 2 to obtain M x N difference values, and when the difference value is greater than a threshold value Y7, marking the battery monomer corresponding to the difference value and marking the battery monomer as balanced charging, wherein the threshold value Y7 is greater than 0;
thereby completing the marking of the battery cells having the equalization condition in the battery pack (300).
2. The active balancing method implemented by using the active balancing system of battery packs according to claim 1, wherein the battery cells in each battery module (310) are of the lithium iron phosphate battery or the ternary battery.
3. The active equalization method implemented by the active equalization system of battery pack according to claim 1, wherein the main controller (100) performs information interaction with the N execution units (200) in a CAN communication manner.
4. The active equalization method implemented by the battery pack active equalization system according to claim 1, wherein each active equalization execution device (210) supplements power to the corresponding battery cell to be equalized by controlling one or both of the power supply of the external power source and the power supply of the battery module (310) corresponding to the active equalization execution device;
each active equalization execution device (210) discharges the corresponding battery cell to be equalized and discharged through one or two discharging modes of resistance discharging and energy conversion between the battery cell to be equalized and the corresponding battery module (310) of the battery cell to be equalized and discharged.
CN201911157401.7A 2019-11-22 2019-11-22 Active equalization system and active equalization method for battery pack Active CN110994712B (en)

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