WO2022110601A1

WO2022110601A1 - Method and apparatus for controlling parallel battery system, and electronic device

Info

Publication number: WO2022110601A1
Application number: PCT/CN2021/085431
Authority: WO
Inventors: 施敏捷; 王中照; 姚帅; 杨宝顺; 韩亮成
Original assignee: 苏州精控能源科技有限公司
Priority date: 2020-11-24
Filing date: 2021-04-02
Publication date: 2022-06-02
Also published as: CN112510775A; CN112510775B

Abstract

The present application provides a method and an apparatus for controlling a parallel battery system, and an electronic device. The method comprises: acquiring the current working mode of a parallel battery system and the current system voltages corresponding to battery subsystems; calculating the current system average voltage of the parallel battery system according to the current system voltages corresponding to the battery subsystems; and according to the current working mode and the relationship between the current system voltages corresponding to the battery subsystems and the current system average voltage, performing a current working mode-based charging or discharging operation on the battery subsystems until the current system voltages corresponding to the battery subsystems and the current system average voltage satisfy a preset system voltage balance relationship. By controlling the charging and discharging operations of the battery subsystems, the voltage balance of the parallel battery system is adjusted, improving the efficiency of adjusting the voltage balance, and furthermore, during adjustment, the parallel battery system is still in a normal working state, ensuring the working efficiency of the parallel battery system.

Description

A control method, device and electronic device for a parallel battery system

technical field

The present application relates to the technical field of battery management, and in particular, to a control method, device and electronic device for a parallel battery system.

Background technique

With the development of science and technology, lithium batteries and other energy storage batteries have now become mainstream. As an energy storage device, a battery system usually includes a single cell and a module; in applications where multiple battery systems are used in parallel, with With the cyclic use of battery systems, the problem of differences between systems is becoming increasingly prominent, such as system voltage imbalance.

In the prior art, when it is found that the voltage unbalance occurs in the parallel battery system, in order to restore the balance, the battery system is usually detected, the unbalanced cells are determined, and the cells are replaced.

However, when the battery cells are replaced, the battery system needs to be in a shutdown state, and the operation process is cumbersome, which will seriously affect its work efficiency. Therefore, there is an urgent need for a control method for a parallel battery system with high voltage balance regulation efficiency, which is of great significance for improving the working efficiency of the parallel battery system.

SUMMARY OF THE INVENTION

The present application provides a control method, device and electronic device for a parallel battery system, so as to solve the defects of the voltage balance control method in the prior art, such as low voltage balance adjustment efficiency.

A first aspect of the present application provides a control method for a parallel battery system, the parallel battery system includes a plurality of parallel battery subsystems, and the method includes:

acquiring the current operating mode of the parallel battery system and the current system voltage corresponding to each battery subsystem;

Calculate the current system average voltage of the parallel battery system according to the current system voltage corresponding to each battery subsystem;

According to the current working mode and the relationship between the current system voltage corresponding to each battery subsystem and the current system average voltage, the charging or discharging operation based on the current working mode is performed on each battery subsystem until each battery subsystem is charged or discharged. A preset system voltage balance relationship is satisfied between the current system voltage corresponding to the system and the current system average voltage.

Optionally, the battery subsystem includes a plurality of battery modules, and the method further includes:

obtaining the current module voltage of each battery module in the battery subsystem;

Calculate the current module average voltage of the battery subsystem according to the current module voltage of each battery module;

According to the relationship between the current module voltage of each battery module and the current module average voltage of the battery subsystem, the charging operation is performed on each battery module until the current module voltage of each battery module is the same as that of all battery modules. The current module average voltages satisfy a preset module voltage balance relationship.

Optionally, the battery module includes a plurality of battery cells, and the method further includes:

obtaining the current cell voltage of each cell in the battery module;

Calculate the current average cell voltage of the battery module according to the current cell voltage of each cell;

According to the relationship between the current cell voltage of each cell and the current cell average voltage of the battery module, each cell is discharged until the current cell voltage of each cell is equal to the current cell voltage of the battery module. The average cell voltages satisfy the preset cell voltage balance relationship.

Optionally, according to the current operating mode and the relationship between the current system voltage corresponding to each battery subsystem and the current system average voltage, charging or discharging each battery subsystem based on the current operating mode is performed. The operation is performed until the preset system voltage balance relationship is satisfied between the current system voltage corresponding to each battery subsystem and the current system average voltage, including:

judging whether the difference between the current system voltage of each battery subsystem and the current system average voltage of the parallel battery system is greater than a preset system voltage difference threshold;

When the difference between the current system voltage of any battery subsystem and the current system average voltage of the parallel battery system is greater than the system voltage difference threshold, determine the current system voltage corresponding to each battery subsystem and the current system voltage The system average voltages do not meet the preset system voltage balance relationship;

When the current operating mode of the parallel battery system is the discharge mode, determining the battery subsystem with the highest current system voltage as the discharge target battery subsystem according to the current system voltage of each battery subsystem;

Perform a discharge operation on the discharge target battery subsystem, and return to the system for judging whether the difference between the current system voltage of each battery subsystem and the current system average voltage of the parallel battery system is greater than a preset value Steps for voltage difference threshold.

Optional, also includes, including:

When the current operating mode of the parallel battery system is the charging mode, determining the battery subsystem with the lowest current system voltage as the charging target battery subsystem according to the current system voltage of each battery subsystem;

Performing a discharging and charging operation on the charging target battery subsystem, and returning to the process of judging whether the difference between the current system voltage of each battery subsystem and the current system average voltage of the parallel battery system is greater than a preset value Steps for the system voltage difference threshold.

Optionally, according to the relationship between the current module voltage of each battery module and the current module average voltage of the battery subsystem, the charging operation is performed on each battery module until the battery module is fully charged. A preset module voltage balance relationship is satisfied between the current module voltage and the current module average voltage, including:

judging whether the difference between the current module voltage of each battery module and the current module average voltage is greater than a preset module voltage difference threshold;

When the difference between the current module voltage of any battery module and the current module average voltage is greater than the preset module voltage difference threshold, determine the current module voltage of each battery module and the The current module average voltages do not meet the preset module voltage balance relationship, and any battery module is determined as the target module;

A charging operation is performed on the target module to increase the current module voltage of the target module, and the process returns to the step of obtaining the current module voltage of each battery module in the battery subsystem.

Optionally, according to the relationship between the current cell voltage of each cell and the current cell average voltage of the battery module, the discharge operation is performed on each cell until the current cell voltage of each cell is The preset cell voltage balance relationship between the voltage and the current average cell voltage includes:

judging whether the difference between the current cell voltage of each cell and the current average voltage of the cell is greater than a preset cell voltage difference threshold;

When the difference between the current cell voltage of any cell and the current cell average voltage is greater than a preset cell voltage difference threshold, determine the current cell voltage of each cell and the current cell average voltage The voltages do not meet the preset cell voltage balance relationship, and any one of the cells is determined as the target cell;

A discharge operation is performed on the target cell to reduce the current voltage of the target cell, and the process returns to the step of acquiring the current cell voltage of each cell in the battery module.

A second aspect of the present application provides a control device for a parallel battery system, the parallel battery system includes a plurality of parallel battery subsystems, and the device includes:

an acquisition module, configured to acquire the current operating mode of the parallel battery system and the current system voltage corresponding to each battery subsystem;

a calculation module, configured to calculate the current system average voltage of the parallel battery system according to the current system voltage corresponding to each battery subsystem;

A control module configured to perform a charging or discharging operation on each battery subsystem based on the current operating mode according to the current operating mode and the relationship between the current system voltage corresponding to each battery subsystem and the current system average voltage , until the preset system voltage balance relationship is satisfied between the current system voltage corresponding to each battery subsystem and the current system average voltage.

Optionally, the battery subsystem includes a plurality of battery modules, and the device further includes a module control module for acquiring the current module voltage of each battery module in the battery subsystem; Calculate the current module average voltage of the battery subsystem; according to the relationship between the current module voltage of each battery module and the current module average voltage of the battery subsystem, for each battery The modules are charged until the current module voltage of each battery module and the current module average voltage satisfy a preset module voltage balance relationship.

Optionally, the battery module includes a plurality of cells, and the device further includes a cell control module for acquiring the current cell voltage of each cell in the battery module; Calculate the current cell average voltage of the battery module from the cell voltage; perform a discharge operation on each cell according to the relationship between the current cell voltage of each cell and the current cell average voltage of the battery module , until the preset cell voltage balance relationship is satisfied between the current cell voltage of each cell and the current average voltage of the cell.

Optionally, the control module is specifically used for:

Optionally, the control module is also specifically used for:

Optionally, the module control module is specifically used for:

Optionally, the cell control module is specifically used for:

A third aspect of the present application provides an electronic device, including: at least one processor and a memory;

the memory stores computer-executable instructions;

The at least one processor executes computer-implemented instructions stored in the memory to cause the at least one processor to perform the methods described above in the first aspect and various possible designs of the first aspect.

A fourth aspect of the present application provides a computer-readable storage medium, where computer-executable instructions are stored in the computer-readable storage medium, and when a processor executes the computer-executable instructions, the first aspect and the first Aspects various possible designs of the described method.

The technical solution of the present application has the following advantages:

The control method, device and electronic device for a parallel battery system provided by the present application, by acquiring the current operating mode of the parallel battery system and the current system voltage corresponding to each battery subsystem; calculating the parallel battery system according to the current system voltage corresponding to each battery subsystem According to the current working mode and the relationship between the current system voltage corresponding to each battery subsystem and the current system average voltage, charge or discharge each battery subsystem based on the current A preset system voltage balance relationship is satisfied between the current system voltage corresponding to the system and the current system average voltage. The control method provided by the above solution adjusts the voltage balance of the parallel battery system by controlling the charge and discharge operations of the battery subsystems in the parallel battery system, thereby improving the voltage balance adjustment efficiency, and during the adjustment process, the parallel battery system is It is still in normal working state, which ensures the working efficiency of the parallel battery system.

Description of drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the accompanying drawings used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are some embodiments of the present application, and for those of ordinary skill in the art, other drawings can also be obtained according to these drawings.

FIG. 1 is a schematic structural diagram of a parallel battery system based on an embodiment of the application;

2 is a schematic flowchart of a control method for a parallel battery system provided by an embodiment of the present application;

3 is a schematic structural diagram of an exemplary parallel battery system provided by an embodiment of the present application;

4 is a schematic flowchart of an exemplary control method for a parallel battery system provided by an embodiment of the present application;

FIG. 5 is a schematic structural diagram of an exemplary battery subsystem provided by an embodiment of the present application;

FIG. 6 is a schematic structural diagram of an exemplary battery module provided by an embodiment of the present application;

7 is a schematic structural diagram of a control device for a parallel battery system provided by an embodiment of the present application;

FIG. 8 is a schematic structural diagram of an electronic device provided by an embodiment of the present application.

Specific embodiments of the present application have been shown by the above-mentioned drawings, and will be described in more detail hereinafter. These drawings and written descriptions are not intended to limit the scope of the disclosed concepts in any way, but to illustrate the concepts of the present application to those skilled in the art by referring to specific embodiments.

Detailed ways

In order to make the purposes, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments It is a part of the embodiments of the present application, but not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

In addition, the terms "first", "second", etc. are used for descriptive purposes only, and should not be construed as indicating or implying relative importance or implying the number of indicated technical features. In the description of the following embodiments, the meaning of "plurality" is two or more, unless otherwise expressly and specifically defined.

In the prior art, when it is found that the voltage unbalance occurs in the parallel battery system, in order to restore the balance, the battery system is usually detected, the unbalanced cells are determined, and the cells are replaced. However, when the battery cells are replaced, the battery system needs to be in a shutdown state, and the operation process is cumbersome, which will seriously affect its work efficiency.

In view of the above problems, the control method, device and electronic device for a parallel battery system provided by the embodiments of the present application obtain the current operating mode of the parallel battery system and the current system voltage corresponding to each battery subsystem; The system voltage calculates the current system average voltage of the parallel battery system; according to the current operating mode and the relationship between the current system voltage corresponding to each battery subsystem and the current system average voltage, each battery subsystem is charged or discharged based on the current operating mode The operation is performed until the preset system voltage balance relationship is satisfied between the current system voltage corresponding to each battery subsystem and the current system average voltage. The control method provided by the above solution adjusts the voltage balance of the parallel battery system by controlling the charge and discharge operations of the battery subsystems in the parallel battery system, thereby improving the voltage balance adjustment efficiency, and during the adjustment process, the parallel battery system is It is still in normal working state, which ensures the working efficiency of the parallel battery system.

The following specific embodiments may be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The embodiments of the present invention will be described below with reference to the accompanying drawings.

First, the structure of the parallel battery system on which this application is based is explained:

The control method, device, and electronic device for a parallel battery system provided by the embodiments of the present application are suitable for balancing and adjusting the current system voltage of each battery subsystem in the parallel battery system. As shown in FIG. 1 , it is a schematic structural diagram of a parallel battery system based on an embodiment of the present application, which mainly includes multiple battery subsystems, a voltage acquisition device, and a parallel battery system for balancing and adjusting the current system voltage of each battery subsystem. control device. Specifically, the current system voltage of each battery subsystem is collected by a voltage acquisition device, and the current system voltage of each battery subsystem is sent to the above control device, and the control device combines the parallel connection according to the obtained current system voltage of each battery subsystem. The current working mode of the battery system controls the charging or discharging of each battery subsystem, so that each battery subsystem in the parallel battery system reaches a state of voltage balance.

An embodiment of the present application provides a control method for a parallel battery system, which is used to balance and adjust the current system voltage of each battery subsystem in the parallel battery system, where the parallel battery system includes a plurality of parallel battery subsystems. The execution subject of the embodiment of the present application is an electronic device, such as an MBMU controller, an MBU controller, an MMU controller, and other electronic devices that can be applied to a parallel battery system and can be used for voltage balance control.

As shown in FIG. 2 , a schematic flowchart of a control method for a parallel battery system provided by an embodiment of the present application, the method includes:

Step 201: Obtain the current operating mode of the parallel battery system and the current system voltage corresponding to each battery subsystem.

The current working mode includes a discharging mode and a charging mode, and the current system voltage of each battery subsystem can be specifically collected by a voltage collecting device disposed in the parallel battery system.

Step 202: Calculate the current system average voltage of the parallel battery system according to the current system voltage corresponding to each battery subsystem.

It needs to be explained that the current average voltage of the system is a criterion for judging the voltage balance condition, which reflects the overall situation of the current system voltage of the current parallel battery system.

Step 203, according to the current working mode and the relationship between the current system voltage corresponding to each battery subsystem and the current system average voltage, perform a charging or discharging operation based on the current working mode on each battery subsystem until the A preset system voltage balance relationship is satisfied between the current system voltage and the current system average voltage.

Specifically, in order to relieve the processing pressure of voltage balance adjustment, only one battery subsystem can be charged or discharged at a time, and the current system voltage and the current system average voltage can be monitored in real time, and the current needs can be selected according to the real-time monitoring results. A battery subsystem that performs charging or discharging operations to achieve balance adjustment of the current system voltages of the battery subsystems in the parallel battery system.

Specifically, in one embodiment, it can be determined whether the difference between the current system voltage of each battery subsystem and the current system average voltage of the parallel battery system is greater than a preset system voltage difference threshold; When the difference between the current system voltage and the current system average voltage of the parallel battery system is greater than the system voltage difference threshold, it is determined that the current system voltage corresponding to each battery subsystem and the current system average voltage do not satisfy the preset system voltage balance relationship ; When the current working mode of the parallel battery system is the discharge mode, according to the current system voltage of each battery subsystem, determine the battery subsystem with the highest current system voltage as the discharge target battery subsystem; perform the discharge operation on the discharge target battery subsystem, And return to the step of acquiring the current operating mode of the parallel battery system and the current system voltage corresponding to each battery subsystem (step 201 ).

It should be explained that the system voltage threshold can be specifically set according to the actual situation, such as 10V and so on. The above-mentioned preset system voltage balance relationship refers to the difference between the current system voltage of each battery subsystem and the current system average voltage of the parallel battery system. When the difference between the current system voltage of each battery subsystem and the current system average voltage of the parallel battery system is not greater than the system voltage difference threshold, it can be determined that the current system voltage of each battery subsystem and the current system average voltage of the parallel battery system The voltages satisfy the system voltage balance relationship.

Specifically, when the difference between the current system voltage of any battery subsystem and the current system average voltage of the parallel battery system is greater than the system voltage difference threshold, it proves that the current system voltage of the battery subsystem exceeds the voltage balance range. When the current working mode of the parallel battery system is the discharge mode, the battery subsystem with the highest voltage in the current system can be controlled to be switched in first to discharge, and when the current system voltage of the switched-in battery subsystem drops, it is no longer the current The battery subsystem with the highest system voltage. At this time, the battery subsystem with the highest current system voltage at the current moment can be switched to discharge until the current system voltage corresponding to each battery subsystem and the current system average voltage satisfy the preset system voltage balance relationship.

Correspondingly, when the current working mode of the parallel battery system is the charging mode, according to the current system voltage of each battery subsystem, determine the battery subsystem with the lowest current system voltage as the charging target battery subsystem; discharge the charging target battery subsystem. The charging operation is performed, and the process returns to the step of acquiring the current operating mode of the parallel battery system and the current system voltage corresponding to each battery subsystem (step 201 ).

Specifically, when the current working mode of the parallel battery system is the charging mode, the battery subsystem with the lowest current system voltage can be controlled to switch in first, and perform a charging operation. When the current system voltage of the switched-in battery subsystem is increased, Make it no longer the battery subsystem with the lowest voltage in the current system. At this time, the battery subsystem with the lowest current system voltage at the current moment can be switched to perform charging until the preset system voltage balance relationship is satisfied between the current system voltage corresponding to each battery subsystem and the current system average voltage.

Similarly, each battery subsystem can also be charged or discharged according to the difference between the current system battery capacity corresponding to each battery subsystem and the current system average battery capacity, so that the current system corresponding to each battery subsystem can be charged or discharged. The relationship between the system battery capacity and the current system average battery capacity satisfies the preset system battery capacity balance relationship. The specific battery capacity balance adjustment method is the same as the voltage balance adjustment method provided in the foregoing embodiment, and details are not described herein again.

Specifically, the battery capacity may be calculated by using the prior art, and the specific calculation method is not limited in the embodiment of the present application.

3 is a schematic structural diagram of an exemplary parallel battery system provided by an embodiment of the present application. Specifically, the switch-in operation of each battery subsystem can be implemented by controlling the control switches corresponding to each battery subsystem. .

Exemplarily, as shown in FIG. 4 , it is a schematic flowchart of an exemplary control method for a parallel battery system provided by an embodiment of the present application, wherein the control method shown in FIG. 4 is a result of the control method shown in FIG. 2 . In an exemplary embodiment, the implementation principle of the two is the same, and details are not described here.

On the basis of the above embodiment, considering that each battery subsystem includes multiple battery modules, and each battery module also has the risk of voltage imbalance, in order to further improve the voltage balance adjustment efficiency, as an implementable method On the basis of the above embodiment, in one embodiment, the current module voltage of each battery module in the battery subsystem can be obtained; according to the current module voltage of each battery module, the current module average of the battery subsystem can be calculated voltage; according to the relationship between the current module voltage of each battery module and the current module average voltage of the battery subsystem, charge each battery module until the current module voltage of each battery module is the same as the current module voltage. The average voltages satisfy the preset module voltage balance relationship.

Specifically, in an embodiment, it can be determined whether the difference between the current module voltage of each battery module and the current module average voltage is greater than a preset module voltage difference threshold; when the current module voltage of any battery module is When the difference between the module voltage and the current module average voltage is greater than the preset module voltage difference threshold, it is determined that the current module voltage of each battery module and the current module average voltage do not meet the preset module voltage The voltage balance relationship is determined, and any battery module is determined as the target module; the charging operation is performed on the target module to increase the current module voltage of the target module, and the current module voltage of each battery module in the battery subsystem is returned to obtain the current Module voltage steps.

Similarly, the preset module voltage balance relationship refers to the difference between the current module voltage of each battery module and the current module average voltage, when the current module voltage of each battery module and the current module average voltage When the difference between the voltages is not greater than the preset module voltage difference threshold, it can be determined that the current module voltage of each battery module and the current module average voltage satisfy the preset module voltage balance relationship.

Similarly, the target battery module can also be charged according to the difference between the current module battery capacity corresponding to each battery module and the average battery capacity of the current module, so that the current module corresponding to each battery module can be charged. The relationship between the battery pack capacity and the current module average battery capacity satisfies the preset module battery capacity balance relationship. The specific battery capacity balance adjustment method is the same as the voltage balance adjustment method provided in the foregoing embodiment, and details are not described herein again.

Specifically, as shown in FIG. 5 , which is a schematic structural diagram of an exemplary battery subsystem provided by an embodiment of the present application, a module charging circuit for charging each battery module may be set in the battery subsystem. Control the closing and opening of the control switch in the module charging circuit corresponding to each battery module, and transmit the electric energy in the energy storage unit to the target module, so as to complete the charging operation of the target module, so as to improve the target module The current module voltage of each battery module gradually satisfies the preset module voltage balance relationship between the current module voltage of each battery module and the current module average voltage.

On the basis of the above embodiment, considering that each battery module includes a plurality of cells, and each cell also has the risk of voltage imbalance, in order to further improve the voltage balance adjustment efficiency, as an implementable way, in the above On the basis of the embodiment, in one embodiment, the current cell voltage of each cell in the battery module can be obtained; the current cell average voltage of the battery module is calculated according to the current cell voltage of each cell; The relationship between the current cell voltage of the cell and the current cell average voltage of the battery module is determined, and the discharge operation is performed on each cell until the current cell voltage of each cell and the current cell average voltage meet the preset value. Cell voltage balance relationship.

Specifically, in one embodiment, it can be determined whether the difference between the current cell voltage of each cell and the current average voltage of the cell is greater than a preset cell voltage difference threshold; when the current cell voltage of any cell is When the difference between the voltage and the current cell average voltage is greater than the preset cell voltage difference threshold, it is determined that the current cell voltage of each cell and the current cell average voltage do not satisfy the preset cell voltage balance relationship , and determine any cell as the target cell; perform a discharge operation on the target cell to reduce the current voltage of the target cell, and return to the step of obtaining the current cell voltage of each cell in the battery module.

Similarly, the preset cell voltage balance relationship refers to the difference between the current cell voltage of each cell and the current average voltage of the cell, when the difference between the current cell voltage of each cell and the current average voltage of the cell When the difference between them is not greater than the preset cell voltage difference threshold, it can be determined that the preset cell voltage balance relationship is satisfied between the current cell voltage of each cell and the current average voltage of the cell.

Similarly, the target cell can also be discharged according to the difference between the current cell battery capacity corresponding to each cell and the current average battery capacity of the cell, so that the current cell battery capacity corresponding to each cell can be discharged. The relationship with the current average cell capacity satisfies the preset cell-battery capacity balance relationship. The specific battery capacity balance adjustment method is the same as the voltage balance adjustment method provided in the foregoing embodiment, and details are not described herein again.

Specifically, as shown in FIG. 6 , which is a schematic structural diagram of an exemplary battery module provided by an embodiment of the present application, wherein the Balancing IC is a control switch, and specifically, a battery module for discharging each cell may be set in the battery module. The cell discharge circuit completes the discharge operation to the target by controlling the closing and opening of the control switch in the cell discharge circuit corresponding to each cell, so as to reduce the current cell voltage of the cell, and gradually make the voltage of each cell. The preset cell voltage balance relationship is satisfied between the current cell voltage and the current cell average voltage.

Among them, the electric energy released by the target cell can be specifically recovered to the battery module through the cell discharge circuit and the transformer, and then dispersedly transmitted to other cells through the battery module, thus achieving the goal of increasing the current cell voltage. The electrical energy in the cell is transferred to other cells whose current cell voltage is low.

Among them, in order to further improve the balance adjustment efficiency of the parallel battery system, the control sequence of the control method for the parallel battery system provided by the embodiment of the present application may be determined according to the priority corresponding to the battery subsystem, the battery module, and the battery cell, wherein the battery The priority of the subsystem is the highest, the priority of the battery module is the second highest, and the priority of the battery cell is the lowest. That is, the control sequence of the control method of the parallel battery system provided by the embodiment of the present application is the battery subsystem, the battery module, and the battery cell in sequence. Specifically, after it is determined that the current system voltage corresponding to each battery subsystem and the current system average voltage satisfy a preset system voltage balance relationship, the current module voltage of each battery module in the battery subsystem is balanced and adjusted, After the preset module voltage balance relationship is satisfied between the current module voltage of each battery module and the current module average voltage, the current cell voltage of each cell in the battery module is balanced and adjusted until each battery A preset cell voltage balance relationship is satisfied between the current cell voltage of the cell and the current cell average voltage.

The control method of the parallel battery system provided by the embodiment of the present application obtains the current operating mode of the parallel battery system and the current system voltage corresponding to each battery subsystem; calculates the current system average of the parallel battery system according to the current system voltage corresponding to each battery subsystem voltage; according to the current working mode and the relationship between the current system voltage corresponding to each battery subsystem and the current system average voltage, charge or discharge each battery subsystem based on the current working mode until the current The preset system voltage balance relationship is satisfied between the system voltage and the current system average voltage. The control method provided by the above solution adjusts the voltage balance of the parallel battery system by controlling the charge and discharge operations of the battery subsystems in the parallel battery system, thereby improving the voltage balance adjustment efficiency, and during the adjustment process, the parallel battery system is It is still in normal working state, which ensures the working efficiency of the parallel battery system. In addition, corresponding voltage balance adjustment is also performed for the current module voltage of each battery module in the battery subsystem and the current cell voltage of each cell in the battery module. From the battery subsystem to the battery module, and finally to the cell level, the active balance control is implemented, which further improves the efficiency of voltage balance regulation, keeps the parallel battery system in a balanced state during use, and improves the cyclic use of the parallel battery system. life, to achieve the purpose of reducing after-sales maintenance costs.

Embodiments of the present application provide a control device for a parallel battery system, which is used to implement the control method for a parallel battery system provided by the above embodiments.

As shown in FIG. 7 , it is a schematic structural diagram of a control device of a parallel battery system provided by an embodiment of the present application. The control device 70 includes an acquisition module 701 , a calculation module 702 and a control module 703 .

The acquisition module 701 is used to acquire the current operating mode of the parallel battery system and the current system voltage corresponding to each battery subsystem; the calculation module 702 is used to calculate the current system of the parallel battery system according to the current system voltage corresponding to each battery subsystem average voltage; the control module 703 is configured to perform a charging or discharging operation based on the current working mode for each battery subsystem according to the current working mode and the relationship between the current system voltage corresponding to each battery subsystem and the current system average voltage, until A preset system voltage balance relationship is satisfied between the current system voltage corresponding to each battery subsystem and the current system average voltage.

Specifically, in an embodiment, the battery subsystem includes a plurality of battery modules, and the device further includes a module control module 704 for acquiring the current module voltage of each battery module in the battery subsystem; Calculate the current module average voltage of the battery subsystem; according to the relationship between the current module voltage of each battery module and the current module average voltage of the battery subsystem, charge each battery module, Until the current module voltage of each battery module and the current module average voltage satisfy the preset module voltage balance relationship.

Specifically, in one embodiment, the battery module includes a plurality of cells, and the device further includes a cell control module 705 for acquiring the current cell voltage of each cell in the battery module; The cell voltage calculates the current cell average voltage of the battery module; according to the relationship between the current cell voltage of each cell and the current cell average voltage of the battery module, each cell is discharged until the The preset cell voltage balance relationship is satisfied between the current cell voltage and the current cell average voltage.

Specifically, in one embodiment, the control module 703 is specifically configured to:

When the difference between the current system voltage of any battery subsystem and the current system average voltage of the parallel battery system is greater than the system voltage difference threshold, it is determined that the difference between the current system voltage corresponding to each battery subsystem and the current system average voltage does not meet the predetermined threshold. Set the system voltage balance relationship;

When the current working mode of the parallel battery system is the discharge mode, according to the current system voltage of each battery subsystem, the battery subsystem with the highest current system voltage is determined as the discharge target battery subsystem;

Perform a discharge operation on the target battery subsystem, and return to the step of judging whether the difference between the current system voltage of each battery subsystem and the current system average voltage of the parallel battery system is greater than a preset system voltage difference threshold.

Specifically, in one embodiment, the control module 703 is further configured to:

When the current working mode of the parallel battery system is the charging mode, according to the current system voltage of each battery subsystem, determine the battery subsystem with the lowest current system voltage as the charging target battery subsystem;

Perform a discharging and charging operation on the charging target battery subsystem, and return to the step of judging whether the difference between the current system voltage of each battery subsystem and the current system average voltage of the parallel battery system is greater than a preset system voltage difference threshold.

Specifically, in one embodiment, the module control module 704 is specifically used for:

Determine whether the difference between the current module voltage of each battery module and the current module average voltage is greater than a preset module voltage difference threshold;

When the difference between the current module voltage of any battery module and the current module average voltage is greater than the preset module voltage difference threshold, determine the difference between the current module voltage of each battery module and the current module average voltage The preset module voltage balance relationship is not satisfied, and any battery module is determined as the target module;

Specifically, in one embodiment, the cell control module 705 is specifically used for:

Determine whether the difference between the current cell voltage of each cell and the current average voltage of the cell is greater than a preset cell voltage difference threshold;

When the difference between the current cell voltage of any cell and the current cell average voltage is greater than the preset cell voltage difference threshold, it is determined that the difference between the current cell voltage of each cell and the current cell average voltage is not Satisfy the preset cell voltage balance relationship, and determine any cell as the target cell;

Regarding the control device of the parallel battery system in this embodiment, the specific manner in which each module performs operations has been described in detail in the embodiment of the method, and will not be described in detail here.

The control device for the parallel battery system provided by the embodiment of the present application is used to execute the control method for the parallel battery system provided by the above embodiment, and the implementation manner is the same as the principle, which will not be repeated.

The embodiments of the present application provide an electronic device for implementing the control method of the parallel battery system provided by the above embodiments.

As shown in FIG. 8 , it is a schematic structural diagram of an electronic device provided in an embodiment of the present application. The electronic device 80 includes: at least one processor 81 and a memory 82;

The memory stores computer-executed instructions; the at least one processor executes the computer-executed instructions stored in the memory, so that the at least one processor executes the control method for a parallel battery system provided by the above embodiments.

An electronic device provided by an embodiment of the present application is used to execute the control method of the parallel battery system provided by the above-mentioned embodiment. The implementation manner is the same as the principle, and details are not described again.

Embodiments of the present application provide a computer-readable storage medium, where computer-executable instructions are stored in the computer-readable storage medium, and when a processor executes the computer-executable instructions, the parallel battery system provided in any of the above embodiments is implemented control method.

The storage medium containing the computer-executable instructions of the embodiments of the present application can be used to store the computer-executable instructions of the control method of the parallel battery system provided in the foregoing embodiments.

In the several embodiments provided in this application, it should be understood that the disclosed apparatus and method may be implemented in other manners. For example, the apparatus embodiments described above are only illustrative. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored, or not implemented. On the other hand, the shown or discussed mutual coupling or direct coupling or communication connection may be through some interfaces, indirect coupling or communication connection of devices or units, and may be in electrical, mechanical or other forms.

The units described as separate components may or may not be physically separated, and components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution in this embodiment.

In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically alone, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware, or may be implemented in the form of hardware plus software functional units.

Those skilled in the art can clearly understand that for the convenience and brevity of the description, only the division of the above functional modules is used for illustration. The internal structure is divided into different functional modules to complete all or part of the functions described above. For the specific working process of the apparatus described above, reference may be made to the corresponding process in the foregoing method embodiments, and details are not described herein again.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: The technical solutions described in the foregoing embodiments can still be modified, or some or all of the technical features thereof can be equivalently replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the embodiments of the present application. scope.

Claims

A control method for a parallel battery system, the parallel battery system comprising a plurality of parallel battery subsystems, characterized in that the method includes:

acquiring the current operating mode of the parallel battery system and the current system voltage corresponding to each battery subsystem;

Calculate the current system average voltage of the parallel battery system according to the current system voltage corresponding to each battery subsystem;

According to the current working mode and the relationship between the current system voltage corresponding to each battery subsystem and the current system average voltage, the charging or discharging operation based on the current working mode is performed on each battery subsystem until each battery subsystem is charged or discharged. A preset system voltage balance relationship is satisfied between the current system voltage corresponding to the system and the current system average voltage.
The control method for a parallel battery system according to claim 1, wherein the battery subsystem includes a plurality of battery modules, wherein the method further comprises:

obtaining the current module voltage of each battery module in the battery subsystem;

Calculate the current module average voltage of the battery subsystem according to the current module voltage of each battery module;

According to the relationship between the current module voltage of each battery module and the current module average voltage of the battery subsystem, the charging operation is performed on each battery module until the current module voltage of each battery module is the same as that of all battery modules. The current module average voltages satisfy a preset module voltage balance relationship.
The control method for a parallel battery system according to claim 2, wherein the battery module comprises a plurality of battery cells, wherein the method further comprises:

obtaining the current cell voltage of each cell in the battery module;

Calculate the current average cell voltage of the battery module according to the current cell voltage of each cell;

According to the relationship between the current cell voltage of each cell and the current cell average voltage of the battery module, each cell is discharged until the current cell voltage of each cell is equal to the current cell voltage of the battery module. The average cell voltages satisfy the preset cell voltage balance relationship.
The control method for a parallel battery system according to claim 1, characterized in that, according to the current working mode and the relationship between the current system voltage corresponding to each battery subsystem and the current system average voltage, the The battery subsystem performs a charging or discharging operation based on the current working mode until the current system voltage corresponding to each battery subsystem and the current system average voltage satisfies a preset system voltage balance relationship, including:

judging whether the difference between the current system voltage of each battery subsystem and the current system average voltage of the parallel battery system is greater than a preset system voltage difference threshold;

When the difference between the current system voltage of any battery subsystem and the current system average voltage of the parallel battery system is greater than the system voltage difference threshold, determine the current system voltage corresponding to each battery subsystem and the current system voltage The system average voltages do not meet the preset system voltage balance relationship;

When the current operating mode of the parallel battery system is the discharge mode, determining the battery subsystem with the highest current system voltage as the discharge target battery subsystem according to the current system voltage of each battery subsystem;

Perform a discharge operation on the discharge target battery subsystem, and return to the system for judging whether the difference between the current system voltage of each battery subsystem and the current system average voltage of the parallel battery system is greater than a preset value Steps for voltage difference threshold.
The control method for a parallel battery system according to claim 4, further comprising:

When the current operating mode of the parallel battery system is the charging mode, determining the battery subsystem with the lowest current system voltage as the charging target battery subsystem according to the current system voltage of each battery subsystem;

Performing a discharging and charging operation on the charging target battery subsystem, and returning to the process of judging whether the difference between the current system voltage of each battery subsystem and the current system average voltage of the parallel battery system is greater than a preset value Steps for the system voltage difference threshold.
The control method for a parallel battery system according to claim 2, wherein the method for determining the current module voltage according to the relationship between the current module voltage of each battery module and the current module average voltage of the battery subsystem Each battery module is charged until the current module voltage of each battery module and the current module average voltage satisfy a preset module voltage balance relationship, including:

judging whether the difference between the current module voltage of each battery module and the current module average voltage is greater than a preset module voltage difference threshold;

When the difference between the current module voltage of any battery module and the current module average voltage is greater than the preset module voltage difference threshold, determine the current module voltage of each battery module and the The current module average voltages do not meet the preset module voltage balance relationship, and any battery module is determined as the target module;

A charging operation is performed on the target module to increase the current module voltage of the target module, and the process returns to the step of obtaining the current module voltage of each battery module in the battery subsystem.
The control method for a parallel battery system according to claim 3, wherein the control method for each battery cell is based on the relationship between the current cell voltage of each cell and the current average voltage of the battery module The cells are discharged until the current cell voltage of each cell and the current average voltage of the cells satisfy the preset cell voltage balance relationship, including:

judging whether the difference between the current cell voltage of each cell and the current average voltage of the cell is greater than a preset cell voltage difference threshold;

When the difference between the current cell voltage of any cell and the current cell average voltage is greater than a preset cell voltage difference threshold, determine the current cell voltage of each cell and the current cell average voltage The voltages do not meet the preset cell voltage balance relationship, and any one of the cells is determined as the target cell;

A discharge operation is performed on the target cell to reduce the current voltage of the target cell, and the process returns to the step of acquiring the current cell voltage of each cell in the battery module.
A control device for a parallel battery system, wherein the parallel battery system includes a plurality of parallel battery subsystems, wherein the device includes:

an acquisition module, configured to acquire the current operating mode of the parallel battery system and the current system voltage corresponding to each battery subsystem;

a calculation module, configured to calculate the current system average voltage of the parallel battery system according to the current system voltage corresponding to each battery subsystem;

A control module configured to perform a charging or discharging operation on each battery subsystem based on the current operating mode according to the current operating mode and the relationship between the current system voltage corresponding to each battery subsystem and the current system average voltage , until the preset system voltage balance relationship is satisfied between the current system voltage corresponding to each battery subsystem and the current system average voltage.
An electronic device, comprising: at least one processor and a memory;

the memory stores computer-executable instructions;

The at least one processor executes computer-implemented instructions stored in the memory, causing the at least one processor to perform the method of any one of claims 1-7.
A computer-readable storage medium, wherein computer-executable instructions are stored in the computer-readable storage medium, and when a processor executes the computer-executable instructions, the computer-executable instructions as claimed in any one of claims 1 to 7 are implemented. method.