CN115395118A - Battery pack charge balance control method, device, battery management system and medium - Google Patents
Battery pack charge balance control method, device, battery management system and medium Download PDFInfo
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- CN115395118A CN115395118A CN202210994100.5A CN202210994100A CN115395118A CN 115395118 A CN115395118 A CN 115395118A CN 202210994100 A CN202210994100 A CN 202210994100A CN 115395118 A CN115395118 A CN 115395118A
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- 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
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- 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
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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
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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
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
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- 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
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- 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
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Secondary Cells (AREA)
Abstract
The application provides a battery pack charge balance control method, a battery pack charge balance control device, a battery management system and a medium. The method comprises the following steps: when the target battery pack is charged, acquiring the cycle number and charging rate of the current charging and discharging cycle of the target battery pack; determining at least one balance power parameter corresponding to the cycle number according to a pre-stored index table, the cycle number and the charging rate, wherein the balance power parameter is a power parameter which meets the requirement that a battery management system controls a target battery pack to enter a charge balance mode, and the index table stores the mapping relation among the charging rate, the cycle number and each balance power parameter in actual charge-discharge cycle of a comparison battery pack, which is consistent with the model of the target battery pack; and if any current power parameter in the target battery pack exceeds the corresponding balance power parameter, controlling the target battery pack to enter a charge balance mode so as to realize charge balance of the target battery pack. By adopting the method, the effect of the balance charging of the battery pack can be improved.
Description
Technical Field
The present disclosure relates to battery management technologies, and in particular, to a battery pack charge balance control method, device, battery management system, and medium.
Background
The printed circuit board of the battery pack usually comprises a plurality of battery cells, and when the battery pack (also called a battery pack) is charged, due to slight difference inside the battery cells, along with aging of the battery pack, the situation that the voltage of at least one battery cell and the voltage difference of other battery cells gradually increase can occur. With the development of the battery management technology, in order to improve the charging safety of the battery pack, when the battery pack is controlled to be charged to reach a proper voltage, the battery cell which is charged relatively fast is discharged, so that the charging balance of the whole battery pack is realized.
Currently, controlling the charge balance of a battery pack is to automatically enter a charge balance mode to discharge the battery cell with relatively large voltage when a battery management system monitors that the current power parameter in a target battery pack exceeds a set power parameter threshold in real time, so as to realize the charge balance of the battery pack.
However, as the number of times the battery pack is used varies, the balance power parameter as the on-charge balance condition actually varies. The power parameter threshold value preset by the battery pack is used as a condition for entering charge balance, so that the effect of balance charging of the battery pack is poor.
Disclosure of Invention
The application provides a battery pack charge balance control method, a battery pack charge balance control device, a battery management system and a medium, which are used for solving the technical problem that in the prior art, the battery pack charge balance effect is poor.
In a first aspect, the present application provides a battery pack charge balance control method, applied to a battery management system, the method including:
when the target battery pack is charged, acquiring the cycle number and the charging rate of the current charging and discharging cycle of the target battery pack, wherein the cycle number refers to the number of times that the battery pack is charged from zero electric quantity to full electric quantity and then discharged to zero electric quantity;
determining at least one balance power parameter corresponding to the cycle number according to a pre-stored index table, the cycle number and the charging rate, wherein the balance power parameter is a power parameter which meets the requirement that the battery management system controls the target battery pack to enter a charge balance mode, and the index table stores the mapping relation among the charging rate, the cycle number and each balance power parameter in actual charge and discharge cycles of a comparison battery pack which is consistent with the model of the target battery pack;
and if any current power parameter in the target battery pack is monitored to exceed the corresponding balance power parameter, controlling the target battery pack to enter a charge balance mode so as to realize charge balance of the target battery pack.
In a second aspect, the present application provides a battery pack charge balance control apparatus, located in a battery management system, including:
the number of times and multiplying power acquisition module is used for acquiring the number of times of current charge and discharge cycles of the target battery pack and the charging multiplying power when the target battery pack is charged, wherein the number of times of the current charge and discharge cycles of the target battery pack is the number of times of charging the battery pack from zero electric quantity to full electric quantity and then discharging the battery pack to zero electric quantity;
the balance voltage value determining module is used for determining at least one balance power parameter corresponding to the cycle number according to a pre-stored index table, the cycle number and the charging rate, wherein the balance power parameter is a power parameter which meets the requirement that the battery management system controls the target battery pack to enter a charging balance mode, and the index table stores the mapping relation among the charging rate, the cycle number and each balance power parameter in actual charging and discharging cycles of a comparison battery pack which is consistent with the model of the target battery pack;
and the charge balance control module is used for controlling the target battery pack to enter a charge balance mode to realize charge balance of the target battery pack if any current power parameter in the target battery pack exceeds the corresponding balance power parameter.
In a third aspect, the present application provides a battery management system, comprising: a processor, and a memory communicatively coupled to the processor;
the memory stores computer-executable instructions;
the processor executes computer-executable instructions stored by the memory to implement the method of the first aspect.
In a fourth aspect, the present application provides a computer-readable storage medium having stored thereon computer-executable instructions for implementing the method according to the first aspect when executed by a processor.
According to the battery pack charging balance control method, the battery pack charging balance control device, the battery management system and the medium, when the target battery pack is charged, the cycle number and the charging rate of the current charging and discharging cycle of the target battery pack are obtained, wherein the cycle number refers to the number of times that the battery pack is charged from zero electric quantity to full electric quantity and then discharged to zero electric quantity; determining at least one balance power parameter corresponding to the cycle number according to a pre-stored index table, the cycle number and the charging rate, wherein the balance power parameter is a power parameter which meets the requirement that the battery management system controls the target battery pack to enter a charge balance mode, and the index table stores the mapping relation among the charging rate, the cycle number and each balance power parameter in actual charge and discharge cycles of a comparison battery pack which is consistent with the model of the target battery pack; and if any current power parameter in the target battery pack is monitored to exceed the corresponding balance power parameter, controlling the target battery pack to enter a charge balance mode so as to realize charge balance of the target battery pack. Compared with the prior art that the problem of battery pack aging is ignored, the set power parameter threshold value is uniformly adopted as the control condition, and the method for determining the balance power parameter as the mode for controlling the target battery pack to enter the charge balance mode according to the actual cycle number and the charge multiplying power is more flexible, so that the effect of realizing the battery pack balance charging can be effectively improved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application.
Fig. 1 is a diagram of an application scenario for implementing a battery pack charge balance control method according to an embodiment of the present application;
fig. 2 is a schematic flowchart illustrating a method for implementing a battery pack charge balance control according to an embodiment of the present disclosure;
fig. 3 is a schematic flowchart of a method for implementing charge balance control of a battery pack according to another embodiment of the present application;
fig. 4 is a schematic structural diagram of a method for implementing the charge balance control of the battery pack according to the present application;
fig. 5 is a schematic diagram of a battery management system for implementing a battery pack charge balance control method.
With the above figures, there are shown specific embodiments of the present application, which will be described in more detail below. These drawings and written description are not intended to limit the scope of the inventive concepts in any manner, but rather to illustrate the inventive concepts to those skilled in the art by reference to specific embodiments.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. The following description refers to the accompanying drawings in which the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.
The terms referred to in this application are explained first:
a battery pack: the battery pack is assembled by welding, a plurality of battery cores are connected in series or in parallel through welding equipment to be welded and fixed, and in addition, the battery protection plate, the battery fixing support, the battery shell and other accessories are assembled to obtain the battery pack, so that the battery pack can be connected with electric equipment after being assembled, and the electric equipment is charged and discharged.
For a clear understanding of the technical solutions of the present application, a detailed description of the prior art solutions will be given first.
In a traditional mode, controlling the charge balance of the battery pack is to automatically enter a charge balance mode when a battery management system monitors that a current power parameter in a target battery pack exceeds a set power parameter threshold in real time, and discharge the battery cell with relatively large voltage, so that the charge balance of the battery pack is realized.
However, as the number of times the battery pack is used varies, the balance power parameter as the on-charge balance condition actually varies. The battery pack charge balance effect is poor by taking the preset power parameter threshold value of the battery pack as a condition for entering the charge balance.
Therefore, in order to improve the charge balance of the battery pack, the inventor found out through creative research. Therefore, according to the mapping relation between the charging multiplying power and the cycle number obtained by the comparison battery pack in actual charging and discharging cycles, which is consistent with the model of the target battery pack, and each balance power parameter, and the cycle number and the charging multiplying power of the current target battery pack in charging, at least one balance power parameter corresponding to the cycle number of the target battery pack is determined. When the battery management system monitors that any current power parameter of the target battery pack exceeds the corresponding balance power parameter, the target battery pack is controlled to enter a charge balance mode so as to realize the balance charging of the target battery pack. Compared with the prior art in which the aging problem of the battery pack is ignored and a set power parameter threshold value is uniformly adopted as a control condition, the method for determining the balance power parameter as the mode for controlling the target battery pack to enter the charging balance mode according to the actual cycle number and the charging rate is more flexible, and therefore the effect of realizing the charging balance of the battery pack can be effectively improved.
As shown in fig. 1, in an application scenario of the battery pack charge balance control method provided in this embodiment of the application scenario, a corresponding network architecture in the application scenario includes a battery management system 10 and a target battery pack 20, where the battery management system 10 may be configured to control charging and discharging of the target battery pack 20, and in a process of controlling charging of the target battery pack 20, if a cycle number and a charge rate of a current charge and discharge cycle of the target battery pack 20 are monitored, an index table pre-stored in the battery management system 10 is queried to determine at least one balance power parameter corresponding to the current cycle number of the target battery pack 20. If it is monitored that any current power parameter exceeds the corresponding balance power parameter in the target battery pack 20, it is determined that the target battery pack 20 simultaneously satisfies various conditions for controlling the target battery pack 20 to enter the charge balance mode, and the target battery pack 20 may be controlled to enter the charge balance mode, so as to achieve the balanced charging of the target battery pack 20.
The following describes the technical solution of the present application and how to solve the above technical problems in detail by specific embodiments. The following several specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments. Embodiments of the present application will be described below with reference to the accompanying drawings.
Fig. 2 is a diagram illustrating a method for controlling charge balance of a battery pack according to an embodiment of the present disclosure, and as shown in fig. 2, an execution subject of the method for controlling charge balance of a battery pack according to the embodiment is a battery management system. The method for controlling the charge balance of the battery pack provided by the embodiment comprises the following steps:
The target battery pack is a battery pack which is controlled by the battery management system to realize charge balance in the charging process. A charge-discharge cycle refers to a complete process of charging the battery pack from zero charge to full charge and then discharging from full charge to zero charge. The cycle number refers to the number of times that the battery pack is charged from zero charge to full charge and then discharged to zero charge.
The charge rate is a multiple of the actual charge current to the standard charge current. The charging of the charging package according to the charging current of the charging rate means that the charging current is multiplied by the charging rate on the basis of the standard charging current to be used as the actual charging current to charge the battery package. For example, the standard charging current is 1 ampere, and a charging rate of 0.5 rate means that the charging pack is charged with a charging current of 0.5 ampere.
The battery management system may record the number of cycles of the battery pack for performing charge and discharge cycles, and may record the number of cycles through a logic processing unit or a data storage hardware circuit. When the target charging packet starts to be charged, or in the charging process, the battery management system can acquire the current cycle number of charging and discharging cycles of the target battery packet.
And step 102, determining at least one balance power parameter corresponding to the cycle number according to a pre-stored index table, the cycle number and the charging rate.
The balance power parameter is a power parameter which satisfies the condition that the battery management system controls the target battery pack to enter a charge balance mode. Optionally, the balancing power parameter comprises at least one of a balancing voltage value and a balancing voltage difference. The balance voltage value refers to a voltage value at which the battery pack to be controlled enters charge balance. The balance voltage difference refers to the voltage difference for controlling the target battery pack to enter charge balance.
The index table is constructed by test data obtained in the actual charge-discharge cycle process of the battery pack except the target battery pack. The index table stores the mapping relationship between the charging multiplying power, the cycle number and each balance power parameter. That is, the index table stores the mapping relationship between the actual charge-discharge cycle time charge rate and cycle number of the comparison battery pack, which is in accordance with the target battery pack model, and each balance power parameter.
The reference battery pack is used for constructing the battery pack for obtaining the index table, and the reference battery pack and the target battery pack should be of the same type. Because only the battery packs of the same model have relatively small difference in internal structure, the experimental data of the control battery pack is relatively more accurate when applied to control the charge balance of the target battery pack.
The power parameter is a parameter related to power, and may include a voltage value, a voltage difference, and the like. The current power parameter refers to a power parameter corresponding to the target battery pack at the current moment in the actual charging and discharging cycle process. The battery management system controls the electric core voltage in the target battery pack to regulate and control after the target battery pack enters the charge balancing mode so as to realize the charge balancing of the target battery pack.
Generally, the condition for turning on charge balancing is that each power parameter is required to satisfy the corresponding balance power parameter at the same time. In this embodiment, the mapping relationship of the index table is determined according to one of the balance power parameters when the battery pack is subjected to charge/discharge cycles each time. Therefore, when the charging balance is carried out according to any balance power parameter, other power parameters can be ensured to simultaneously exceed the corresponding balance power parameters.
When the battery management system monitors that any current power in the target battery pack exceeds a corresponding balance power parameter, for example, the current voltage value exceeds a balance voltage value, or the current voltage difference exceeds a balance voltage difference, the battery management system controls the target battery pack to enter a charge balance mode, and in the process of entering the charge balance mode, the battery management system can realize the balanced charging of the target battery pack by regulating and controlling the voltage of an internal battery core of the target battery pack.
In the application, when the target battery pack is charged, the cycle number and the charging rate of the current charge-discharge cycle of the target battery pack are obtained, wherein the cycle number refers to the number of times that the battery pack is charged from zero electric quantity to full electric quantity and then discharged to zero electric quantity; determining at least one balance power parameter corresponding to the cycle number according to a pre-stored index table, the cycle number and the charging rate, wherein the balance power parameter is a power parameter which meets the requirement that the battery management system controls the target battery pack to enter a charge balance mode, and the index table stores the mapping relation among the charging rate, the cycle number and each balance power parameter in actual charge and discharge cycles of a comparison battery pack which is consistent with the model of the target battery pack; and if any current power parameter exceeding the corresponding balance power parameter exists in the target battery pack, controlling the target battery pack to enter a charge balance mode so as to realize the balance charging of the target battery pack. Compared with the prior art that the problem of battery pack aging is ignored and a set power parameter threshold value is uniformly adopted as a control condition, the method for determining the balance power parameter as the mode for controlling the target battery pack to enter the charge balance mode according to the actual cycle number and the charge multiplying power is more flexible, and therefore the effect of realizing the charge balance of the battery pack can be effectively improved.
Further understanding of the prior art, the power parameter thresholds that control the charge balance of the battery pack typically include a set voltage threshold and a set voltage differential threshold, and the battery management system will control the battery pack to enter the charge balance mode when both power parameter thresholds are met. For example, if the battery management system monitors in real time that the minimum voltage value of the battery cells inside the battery pack exceeds the set voltage threshold and the voltage difference between the battery cells inside the battery pack exceeds the set voltage difference threshold, the battery pack is controlled to enter a charge balancing mode to discharge the battery cells with relatively large voltage inside the battery pack, so that the charge balance of the battery pack is realized. Because the battery pack can age gradually in the using process, the SOC (state of charge) of the battery pack can be gradually reduced along with the aging, so that the balance voltage value as a starting charge balance mode can be gradually reduced, and the balance voltage difference can be gradually increased. The originally set voltage threshold and the set voltage difference threshold cannot meet the requirement of the continuously aging battery pack, and if the set voltage threshold and the set voltage difference threshold are continuously utilized to control as the condition for entering the charge balance, the effect of realizing the charge balance of the battery pack can be reduced.
Since the equilibrium voltage value gradually decreases as the target battery pack ages. Based on the rule, when the target battery pack is controlled to enter the charge balance mode, the target battery pack is controlled to enter according to the actually measured balance voltage value corresponding to the cycle number, so that the target battery pack can enter the charge balance mode according to the balance voltage value smaller than the set voltage threshold value. Because the voltage value corresponding to the maximum SOC value is charged from a smaller balance voltage value in the application, and the voltage value corresponding to the maximum SOC value is charged from a set voltage threshold in the prior art, the time length of the target battery pack in the charge balance mode is longer in the application, which is equivalent to the time for realizing balance charging in the prior art, so that a better balance charging effect can be obtained.
As an optional implementation manner, in this embodiment, before step 101, the following steps are further included:
Specifically, when the index table is constructed, a plurality of charge-discharge cycle experiments are respectively performed on a plurality of comparison battery packs with different magnifications, so that each balance power parameter corresponding to the comparison battery pack with each magnification under different cycle times, that is, the mapping relationship can be obtained.
After the index table is constructed and obtained, the index table can be stored in a battery management system, and after storage, when charging of the target battery pack is monitored, at least one corresponding balance power parameter is determined according to the current cycle number and the charging rate of the target battery pack. In addition, the index table can be stored on a storage medium, so that the index table can be copied to other battery management systems for use.
In the embodiment, at least one balance power parameter corresponding to a plurality of times of charge-discharge cycles of a plurality of comparison battery packs with different multiplying powers is respectively obtained, and an index table is constructed and obtained; and storing the index table in the battery management system. Since the index table is obtained from a plurality of charge and discharge cycles of the control battery pack at each different magnification, the accuracy as a reference for the target battery pack is high.
In the specific construction of the index table, as an optional implementation manner, in this embodiment, step 201, specifically, for the comparison battery pack at each magnification, performs the following steps 301 to 303 until the comparison battery pack at each magnification is completely executed, and then the index table is constructed and obtained:
and 301, acquiring a battery pack curve corresponding to the comparison battery pack with the multiplying power in each charge and discharge cycle.
And the battery pack curve is a curve representing the change of the voltage value of the comparison battery pack of the multiplying power along with time in the process of each charge-discharge cycle. The number of cycles of the charge and discharge cycle may be taken as the maximum number of chargeable and dischargeable cycles within the full life cycle of the control battery pack.
For example, if the maximum number of chargeable/dischargeable cycles is 200 times in the entire life cycle of the comparison battery pack, the battery pack curves corresponding to the comparison battery pack of the corresponding rate during the 200 charging/discharging cycles can be obtained.
The battery management system presets a sampling time interval, collects and records the voltage value of the comparison battery pack in each charge-discharge cycle according to the sampling time interval to obtain a battery pack curve corresponding to the comparison battery pack in the charge-discharge cycle, which is also a specific way for obtaining the battery pack curve corresponding to the comparison battery pack with the multiplying power in each charge-discharge cycle.
Step 302, determining a balance voltage value corresponding to each battery pack curve.
Wherein each battery pack curve has a unique one of the equilibrium voltage values.
Step 303, determining the voltage difference corresponding to each of the balance voltage values as the balance voltage difference corresponding to each charge-discharge cycle of the comparison battery pack with the corresponding rate.
Specifically, for the control battery pack of the multiplying power, when a corresponding balance voltage value is obtained in each charge-discharge cycle, a corresponding balance voltage difference is determined according to the balance voltage value. The equilibrium voltage difference is a voltage difference corresponding to the equilibrium voltage value.
In this embodiment, the following operations are performed for the comparison battery pack of each magnification, and until the comparison battery pack of each magnification is completely executed, an index table is constructed and obtained: acquiring a battery pack curve corresponding to the comparison battery pack with the multiplying power in each charge-discharge cycle, wherein the battery pack curve is a curve representing the change of the voltage value of the comparison battery pack with the multiplying power along with time in each charge-discharge cycle process; determining a balance voltage value corresponding to each battery pack curve; and determining the voltage difference corresponding to each balance voltage value as the balance voltage difference corresponding to each charge-discharge cycle of the contrast battery pack with the multiplying power. Because the balance voltage difference is determined according to the corresponding balance voltage value, when the target battery pack meets the balance voltage value, the corresponding balance voltage difference can be met at the same time, namely the condition of entering a charge balance mode is met at the same time.
As an optional implementation manner, in this embodiment, in step 301, specifically, for each charge and discharge cycle of the comparison battery pack at the magnification, the following steps 401 to 403 are performed until a battery pack curve corresponding to each charge and discharge cycle of the comparison battery pack at the magnification is obtained:
step 401, obtaining a cell curve corresponding to each cell in the comparison battery pack of the multiplying power in the current charge-discharge cycle.
The battery cell curve is a curve representing the change of the voltage value of the battery cell along with time in each charge-discharge cycle process. And comparing each battery cell in the battery pack, wherein a corresponding battery cell curve is arranged in each charge-discharge cycle process.
As mentioned above, the battery management system sets a sampling time interval in advance, and collects and records the voltage value of the comparison battery pack in each charge and discharge cycle according to the sampling time interval, so as to obtain the battery pack curve corresponding to the comparison battery pack in the charge and discharge cycle. More specifically, the battery management system collects and records voltage values of each battery cell of a comparison battery pack in each charge-discharge cycle process according to a preset sampling time interval, firstly obtains a battery cell curve corresponding to each battery cell in the comparison battery pack with the multiplying power in the current charge-discharge cycle, and then determines a battery cell curve from each battery cell curve to serve as a battery pack curve of the comparison battery pack with the multiplying power in the current charge-discharge cycle.
Step 402, obtaining a balance voltage value of the charge and discharge cycle according to a plurality of continuous first voltage difference values entering the raise region in any cell curve.
For any one cell curve, the first voltage difference value is a voltage difference value obtained by subtracting a voltage at a later time point from a voltage at a previous time point in two adjacent time points in the cell curve. The raising area is an area corresponding to a first voltage difference value larger than a preset difference value in the cell curve, and is also an area where a balanced voltage value is most likely to appear. The balance voltage value of the target battery pack usually appears in the rising region where the voltage starts to change sharply, so that the balance voltage value corresponding to each charge and discharge cycle can be found according to a plurality of continuous first voltage difference values in the rising region.
The preset difference value is preset and can be used as a threshold value for judging whether the battery cell curve enters the uplifting region. When a preset number of continuous first voltage difference values are larger than the preset difference value, the cell curve is determined to enter the upper raising area from the first voltage difference value (corresponding to the later time point) larger than the preset difference value.
For example, if the preset difference is 0.06 mv, and 10 consecutive first voltage differences appearing in the cell curve are greater than 0.06 mv, it is considered that the first voltage difference 1 starts to enter the raise region.
According to a plurality of continuous first voltage difference values entering the rising area in each cell curve, the largest first voltage difference value can be determined from the first voltage difference values, and the corresponding balance voltage value of the comparison battery pack with the multiplying power in the current charge-discharge cycle is determined. Or determining a median from each first voltage difference value, and determining the corresponding balance voltage value of the comparison battery pack with the multiplying power in the current charge-discharge cycle according to the median. Or averaging the first voltage difference values, and determining the corresponding balance voltage value of the comparison battery pack with the multiplying power in the current charge-discharge cycle according to the average value. As long as an accurate balance voltage value can be determined and obtained according to the first voltage difference values, the specific implementation manner is not particularly limited herein.
The boost region is the region where the balanced voltage value is most likely to appear, and the balanced voltage value of the charge-discharge cycle is determined according to a plurality of continuous first voltage difference values of the boost region, so that the accuracy of obtaining the balanced voltage value of the charge-discharge cycle can be improved.
And 403, determining the corresponding time when each battery cell curve reaches the balance voltage value of the charge and discharge cycle.
Although the balance voltage values of the battery cells in different charge and discharge cycles may be different, the balance voltage values in the same charge and discharge cycle are equal. In the charge and discharge cycle, all the cells can reach the same balance voltage value, but the difference is that the time for reaching the balance voltage value may be different. The reason for this difference is that, due to the slight difference inside the battery cells, there may be a certain voltage difference when the battery pack leaves the factory, and this voltage difference may increase with the aging of the battery pack, so that each battery cell of the comparison battery pack may have a sequence when reaching the balance voltage value corresponding to this charge-discharge cycle in the charge-discharge cycle process of each time. Generally, during the charging process of the battery pack, the cell with higher voltage reaches the equilibrium voltage value before the cell with lower voltage.
After obtaining the cell curves, the time for the cell curves of the cells to reach the equilibrium voltage value of the charge-discharge cycle can be determined.
And step 403, determining the battery cell curve which reaches the balance voltage value of the current charge-discharge cycle at the latest as the battery pack curve corresponding to the comparison battery pack of the multiplying power in the current charge-discharge cycle.
Specifically, the cell that reaches the balanced voltage value of the charge and discharge cycle at the latest is usually the cell with the smallest voltage in the battery pack, and if the cell with the smallest voltage reaches the balanced voltage value of the charge and discharge cycle at this time, other cells must reach the balanced voltage value. Therefore, the cell curve reaching the current charge-discharge cycle at the latest is used as the battery pack curve of the comparison battery pack with the multiplying power corresponding to the charge-discharge cycle at the current time, and all the cells in the comparison battery pack with the multiplying power can be ensured to reach the balance voltage value.
The method can be understood that in the process of the charge and discharge cycle, the balance voltage value of the cell curve of each cell in the charge and discharge cycle is determined, and then one cell curve is determined from each cell curve to serve as a battery pack curve corresponding to the corresponding charge and discharge cycle of the comparison battery pack with the multiplying power.
In this embodiment, the following operations are performed for each charge and discharge cycle of the control battery pack at the magnification until a battery pack curve corresponding to each charge and discharge cycle of the control battery pack at the magnification is obtained: obtaining a cell curve corresponding to each cell in the comparison cell pack with the multiplying power in the current charge-discharge cycle; determining the corresponding time when each battery cell curve reaches the balance voltage value of the charge-discharge cycle; and determining the cell curve which reaches the balance voltage value of the charge-discharge cycle at the latest as a battery pack curve corresponding to the comparison battery pack of the multiplying power in the charge-discharge cycle at the latest. Aiming at the comparison battery pack with each multiplying power, the time of the battery cell curve of each battery cell in the comparison battery pack with the multiplying power obtained in the process of each charge-discharge cycle is determined, the battery cell curve which reaches the charge-discharge cycle at the latest is taken as the battery pack curve corresponding to the charge-discharge cycle of the comparison battery pack with the multiplying power, all the battery cells in the comparison battery pack with the multiplying power can be ensured to reach the balance voltage, and therefore the accuracy of the battery pack curve is improved.
As an optional implementation manner, in this embodiment, step 402 includes the following steps:
step 501, obtaining a first voltage difference value located in the middle of each first voltage difference value according to a plurality of continuous first voltage difference values entering the upper raising area in any one cell curve.
The first voltage difference is obtained by subtracting the voltage at the later time point from the voltage at the previous time point in two adjacent time points. The first voltage difference value located in the middle of each first voltage difference value may be a median of the first voltage difference values, or may be the first voltage difference value located in the middle in time sequence, for example, there are 12 time points when the cell curve enters the upper region, and there are 11 first voltage difference values, then the first voltage difference value located in the middle of each first voltage difference value is the 6 th first voltage difference value in time sequence.
Step 502, averaging the voltage at the later time point and the voltage at the earlier time point corresponding to the first voltage difference value in the middle to obtain an average value.
The first voltage difference value located in the middle is the first voltage difference value located in the middle of each first voltage difference value. The average value is a value obtained by averaging the voltage at the later time point and the voltage at the previous time point corresponding to the first voltage difference value located in the middle.
And 503, determining the average value as the balance voltage value of the current charge and discharge cycle.
In this embodiment, a first voltage difference value located in the middle of each first voltage difference value is obtained according to a plurality of continuous first voltage difference values entering the upper raising region in each core curve; averaging the voltage of the later time point corresponding to the first voltage difference value in the middle and the voltage of the previous time point to obtain an average value; and determining the average value as the balance voltage value corresponding to the multiple charge and discharge cycles of the control battery pack with the multiplying power. Since the balanced voltage value of the charge-discharge cycle is determined by averaging the voltage at the later time point corresponding to the first voltage difference value located in the middle and the voltage at the previous time point, and the first voltage difference value located in the middle is taken, a more accurate balanced voltage value can be relatively obtained, and therefore, the accuracy of the balanced voltage value of the charge-discharge cycle can be improved.
As an optional implementation manner, in this embodiment, step 303, specifically, for each charge and discharge cycle of the comparison battery pack at the magnification, executes steps 601 to 602 until obtaining a balanced voltage difference corresponding to each charge and discharge cycle of the comparison battery pack at the magnification:
step 601, determining the minimum voltage difference of the comparison battery pack with the multiplying power at any time point of the current charge-discharge cycle according to any time point of the obtained balance voltage value of the current charge-discharge cycle.
Any time point may be a previous time point or a subsequent time point of two adjacent time points for obtaining the balance voltage value of the current charge-discharge cycle.
And according to the any time point, comparing the cell curves of the cells in the comparison battery pack with the multiplying power, acquiring the voltage value corresponding to each cell curve at any time point, determining the voltage difference between any two cells based on each voltage value, and acquiring the minimum voltage difference of the comparison battery pack with the multiplying power at the time point in the charge-discharge cycle.
Step 602, determining the minimum voltage difference as the balance voltage difference corresponding to the current charge-discharge cycle of the comparison battery pack with the multiplying power.
In this embodiment, the following operations are performed for each charge and discharge cycle of the control battery pack at the magnification until obtaining a balanced voltage difference corresponding to each charge and discharge cycle of the control battery pack at the magnification: determining the minimum voltage difference of the comparison battery pack with the multiplying power at the time point in the current charge-discharge cycle according to any time point of obtaining the balance voltage value of the current charge-discharge cycle; and determining the minimum voltage difference as the balance voltage difference corresponding to the current charge-discharge cycle of the comparison battery pack with the multiplying power. Since the balancing voltage difference is obtained based on the minimum voltage difference determined at the time point of obtaining the balancing voltage value of the current charge-discharge cycle, when entering the charge balancing mode according to the balancing voltage value, the charging balancing mode can be entered, which is equivalent to the voltage difference exceeding the corresponding balancing voltage difference, and vice versa.
As an optional implementation manner, in this embodiment, step 103, more specifically, may be as follows, step 701 or step 702, to control the target battery pack to enter a charge balancing mode, where:
step 701, if it is monitored that the minimum voltage in the target battery pack exceeds the balanced voltage value, controlling the target battery pack to enter a charge balancing mode to achieve balanced charging of the target battery pack.
The minimum voltage in the target battery pack is the minimum cell voltage among the cell voltages in the target battery pack. If the minimum voltage in the target battery pack exceeds the balance voltage value, the voltages of other battery cores in the target battery pack must exceed the balance voltage value, and therefore when the minimum voltage in the target battery pack exceeds the balance voltage value, the target battery pack is controlled to enter a charge balance mode, so that the target battery pack is charged in a balance mode.
Step 702, if it is monitored that the minimum voltage difference in the target battery pack exceeds the balance voltage difference, controlling the target battery pack to enter a charge balance mode to realize the balance charging of the target battery pack.
The minimum voltage difference in the target battery pack refers to the minimum voltage difference between the internal battery cores in the target battery pack. If the minimum voltage difference in the target battery pack exceeds the balance voltage difference, other voltage differences in the target battery pack must exceed the balance voltage difference, and therefore when the minimum voltage difference in the target battery pack exceeds the balance voltage difference, the target battery pack is controlled to enter a charge balance mode to achieve balanced charging of the target battery pack.
In this embodiment, when the battery management system monitors that the minimum voltage in the target battery pack exceeds the equilibrium voltage value, or the minimum voltage difference in the target battery pack exceeds the equilibrium voltage difference, the target battery pack may be controlled to enter the charge balancing mode, so as to achieve charge balancing of the target battery pack.
As an optional implementation manner, in this embodiment, in step 103, when controlling the target battery pack to enter the charge balancing mode, specifically, the method includes: and controlling at least one target battery cell in the target battery pack to be connected with a discharge circuit, and discharging the target battery cell while charging the target battery cell.
The target battery cell is a battery cell with a voltage higher than the voltages of the preset number of battery cells in the target battery pack, for example, if the preset number is 2, the target battery cell is a battery cell of 2 before the row selected according to the voltage in the target battery pack.
The discharge circuit may be a load circuit and the load may be a circuit including only a number of thermal resistances. The discharge circuit can be integrated with the target battery pack on a printed circuit board, or can be an external circuit. The battery management system may connect to the discharge circuit by controlling an I/O interface of at least one target cell in the target battery pack. After the target battery cell is connected with the discharge circuit, the target battery cell can be used as a power supply of the discharge circuit to provide current for the discharge circuit, and taking thermal resistance as an example, the thermal resistance can generate heat after the circuit is connected, so that electric energy is converted into heat energy to realize consumption of the electric energy.
The discharge circuit discharges the battery cell with higher voltage in the target battery pack, so that the voltage increase amplitude of the battery cell with higher voltage can be inhibited, and the voltage difference between the battery cell with higher voltage and the voltages of other battery cells is reduced as much as possible. The process of realizing charge balance can be understood as discharging the electric core with larger internal voltage of the battery pack so as to reduce the voltage difference between the electric cores inside the battery pack, thereby realizing the balance of the internal electric core voltage.
The method comprises the steps of charging a target battery cell, discharging the target battery cell, wherein the unit charging current of the target battery cell during charging is larger than the unit discharging current of the target battery cell during discharging. The unit charging current is a charging current per unit time, and the unit discharging current is a discharging current per unit time. For example, the unit charging current of the target cell is 1 ampere per second, and the unit discharging current may be 50 milliamperes per second.
And for other cells except the target cell in the target battery pack, charging is still carried out according to the unit charging current, but discharging is not carried out. That is, while the target cell is discharged, the other cells are normally charged.
In this embodiment, at least one target battery cell in the target battery pack is controlled to be connected to a discharge circuit, and the target battery cell is discharged while the target battery cell is charged; the target battery cell is a battery cell with voltage higher than that of preset battery cells in the target battery pack, and the unit charging current of the target battery cell during charging is larger than the unit discharging current of the target battery cell during discharging. The battery cell with larger voltage in the target battery pack is discharged, so that the voltage difference between the target battery cell and other battery cells in the target battery pack can be reduced as much as possible, and the balanced charging of the target battery pack is realized.
In one embodiment, when the battery management system charges the target battery pack, according to the current charging rate and the cycle number, in order to save the internal data storage space of the battery management system, a voltage value interval may be set in the voltage index table, and the voltage value interval may be determined according to an equal proportion method when table look-up is performed.
Fig. 4 is a schematic structural diagram of a battery pack charge balance control device according to an embodiment of the present application, and as shown in fig. 4, if the battery pack charge balance control device 40 according to the present embodiment is located in a battery management system, the battery pack charge balance control device 40 according to the present embodiment includes: a number and rate obtaining module 41, a balance voltage value determining module 42 and a charge balance control module 43. Wherein:
a frequency and rate obtaining module 41, configured to obtain, when the target battery pack is charged, a cycle frequency and a charging rate of a current charge and discharge cycle of the target battery pack, where the cycle frequency is a frequency of charging the battery pack from zero electric quantity to full electric quantity and then discharging the battery pack to zero electric quantity;
a balanced voltage value determining module 42, configured to determine at least one balanced power parameter corresponding to the cycle number according to a pre-stored index table, the cycle number, and the charging rate, where the balanced power parameter is a power parameter that satisfies a condition that the battery management system controls the target battery pack to enter a charge balancing mode, and a mapping relationship between the charging rate and the cycle number during actual charge and discharge cycles of a comparison battery pack, which are consistent with the model of the target battery pack, and each balanced power parameter is stored in the index table;
and a charge balance control module 43, configured to, if it is monitored that any current power parameter in the target battery pack exceeds the corresponding balance power parameter, control the target battery pack to enter a charge balance mode, so as to implement balanced charging of the target battery pack.
Optionally, the battery pack charge balance control device 40 further includes an index table building module, configured to: respectively obtaining at least one balance power parameter corresponding to multiple charging and discharging cycles of a plurality of comparison battery packs with different multiplying powers, and constructing and obtaining an index table; and storing the index table in the battery management system.
Optionally, the balancing power parameter comprises at least one of: a balance voltage value and a balance voltage difference.
Optionally, the index table building module is configured to, when obtaining at least one balance power parameter corresponding to multiple charge-discharge cycles of multiple comparison battery packs with different magnifications, respectively, and building the obtained index table, specifically: aiming at the comparison battery pack with each multiplying power, the following operations are executed until the comparison battery pack with each multiplying power is executed, and an index table is constructed and obtained: acquiring a battery pack curve corresponding to the comparison battery pack with the multiplying power in each charge-discharge cycle, wherein the battery pack curve is a curve representing the change of the voltage value of the comparison battery pack with the multiplying power along with time in each charge-discharge cycle process; determining a balance voltage value corresponding to each battery pack curve; and determining the voltage difference corresponding to each balance voltage value as the balance voltage difference corresponding to each charge-discharge cycle of the comparison battery pack with the multiplying power.
Optionally, the comparison battery pack includes a plurality of battery cells, and the index table building module is specifically configured to, when acquiring a battery pack curve corresponding to each charge-discharge cycle of the comparison battery pack of this magnification: and aiming at each charge-discharge cycle of the comparison battery pack with the multiplying power, executing the following operations until a battery pack curve corresponding to each charge-discharge cycle of the comparison battery pack with the multiplying power is obtained: obtaining a cell curve corresponding to each cell in the comparison cell pack with the multiplying power in the current charge-discharge cycle; obtaining a balance voltage value of the charge-discharge cycle according to a plurality of continuous first voltage difference values entering the uplifting region in any cell curve; the raising area is an area where a balanced voltage value is most likely to appear in the cell curve, and the first voltage difference value is a difference value obtained by subtracting a voltage at a later time point from a voltage at a previous time point in two adjacent time points; determining the corresponding time when each battery cell curve reaches the balance voltage value of the charge-discharge cycle; and determining the cell curve which reaches the balance voltage value of the charge-discharge cycle at the latest as a battery pack curve corresponding to the comparison battery pack of the multiplying power in the charge-discharge cycle at the latest.
Optionally, the index table building module is specifically configured to, when obtaining the balanced voltage value of the charge-discharge cycle according to a plurality of continuous first voltage difference values entering the upper region in any one of the cell curves: obtaining a first voltage difference value positioned in the middle of each first voltage difference value according to a plurality of continuous first voltage difference values entering a rising area in any one cell curve; averaging the voltage of the later time point corresponding to the first voltage difference value in the middle and the voltage of the previous time point to obtain an average value; and determining the average value as the balance voltage value of the current charge-discharge cycle.
Optionally, the index table building module is configured to, when determining the voltage difference corresponding to each of the balanced voltage values as the balanced voltage difference corresponding to each charge-discharge cycle of the comparison battery pack with the corresponding rate, specifically: and aiming at each charge-discharge cycle of the comparison battery pack with the multiplying power, executing the following operations until obtaining the balance voltage difference corresponding to each charge-discharge cycle of the comparison battery pack with the multiplying power: determining the minimum voltage difference of the comparison battery pack with the multiplying power at the time point in the current charge-discharge cycle according to any time point of obtaining the balance voltage value of the current charge-discharge cycle; and determining the minimum voltage difference as the balance voltage difference corresponding to the current charge-discharge cycle of the contrast battery pack with the multiplying power.
Optionally, the charge balance control module 43, if it is monitored that any current power parameter in the target battery pack exceeds the corresponding balance power parameter, controls the target battery pack to enter a charge balance mode, so as to implement balanced charging of the target battery pack, and is specifically configured to: if the minimum voltage in the target battery pack is monitored to exceed the balance voltage value, controlling the target battery pack to enter a charge balance mode so as to realize the balance charging of the target battery pack; or if the minimum voltage difference in the target battery pack is monitored to exceed the balance voltage difference, controlling the target battery pack to enter a charge balance mode so as to realize the balance charging of the target battery pack.
Optionally, the charge balance control module 43, when controlling the target battery pack to enter the charge balance mode, is specifically configured to: controlling at least one target battery cell in the target battery pack to be connected with a discharge circuit, and discharging the target battery cell while charging the target battery cell; the target battery cell is a battery cell with voltage higher than that of preset battery cells in the target battery pack, and the unit charging current of the target battery cell during charging is larger than the unit discharging current of the target battery cell during discharging.
Fig. 5 is a block diagram illustrating a battery management system according to an exemplary embodiment, and the apparatus may be a battery management system as shown in fig. 5, including: a memory 51, a processor 52; memory 51 is a memory for storing processor-executable instructions; the processor 52 is used to run a computer program or instructions to implement the battery pack charge balance control method provided by any of the above embodiments.
The memory 51 is used for storing programs. In particular, the program may include program code including computer operating instructions. The memory 51 may comprise high-speed RAM memory, and may also include non-volatile memory (non-volatile memory), such as at least one disk memory.
The processor 52 may be a Central Processing Unit (CPU), an Application Specific Integrated Circuit (ASIC), or one or more Integrated circuits configured to implement the embodiments of the present disclosure.
Alternatively, in a specific implementation, if the memory 51 and the processor 52 are implemented independently, the memory 51 and the processor 52 may be connected to each other through a bus 53 and perform communication with each other. The bus 53 may be an Industry Standard Architecture (ISA) bus 53, a Peripheral Component Interconnect (PCI) bus 53, an Extended ISA (EISA) bus 53, or the like. The bus 53 may be divided into an address bus 53, a data bus 53, a control bus 53, and the like. For ease of illustration, only one thick line is shown in fig. 5, but does not indicate only one bus 53 or one type of bus 53.
A non-transitory computer readable storage medium, instructions in which when executed by a processor of a battery management system, enable the battery management system to perform a battery pack charge balance control method of the above battery management system.
Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the application being indicated by the following claims.
It will be understood that the present application is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the application is limited only by the appended claims.
Claims (12)
1. A battery pack charge balance control method is applied to a battery management system and is characterized by comprising the following steps:
when the target battery pack is charged, acquiring the cycle number and charging multiplying power of the current charging and discharging cycle of the target battery pack, wherein the cycle number refers to the number of times that the battery pack is charged from zero electric quantity to full electric quantity and then discharged to zero electric quantity;
determining at least one balance power parameter corresponding to the cycle number according to a pre-stored index table, the cycle number and the charging rate, wherein the balance power parameter is a power parameter which meets the requirement that the battery management system controls the target battery pack to enter a charge balance mode, and the index table stores the mapping relation among the charging rate, the cycle number and each balance power parameter in actual charge and discharge cycles of a comparison battery pack which is consistent with the model of the target battery pack;
and if any current power parameter in the target battery pack exceeds the corresponding balance power parameter, controlling the target battery pack to enter a charge balance mode so as to realize the balance charging of the target battery pack.
2. The method according to claim 1, before acquiring the number of cycles and the charging rate of the current charge and discharge cycle of the target battery pack when the target battery pack is charged, further comprising:
respectively obtaining at least one balance power parameter corresponding to a plurality of times of charge-discharge cycles of a plurality of comparison battery packs with different multiplying powers, and constructing and obtaining an index table;
and storing the index table in the battery management system.
3. The method of claim 1, wherein the balancing power parameter comprises at least one of: a balance voltage value and a balance voltage difference.
4. The method according to claim 3, wherein the obtaining at least one balance power parameter corresponding to a plurality of charge-discharge cycles of a plurality of control battery packs with different multiplying powers respectively to construct an obtaining index table comprises:
aiming at the comparison battery pack with each multiplying power, the following operations are executed until the comparison battery pack with each multiplying power is executed, and an index table is constructed and obtained:
acquiring a battery pack curve corresponding to the comparison battery pack with the multiplying power in each charge-discharge cycle, wherein the battery pack curve is a curve representing the change of the voltage value of the comparison battery pack with the multiplying power along with time in each charge-discharge cycle process;
determining a balance voltage value corresponding to each battery pack curve;
and determining the voltage difference corresponding to each balance voltage value as the balance voltage difference corresponding to each charge-discharge cycle of the comparison battery pack with the multiplying power.
5. The method of claim 4, wherein the comparison battery pack comprises a plurality of battery cells, and the obtaining of the battery pack curve corresponding to the comparison battery pack of the rate in each charge-discharge cycle comprises:
and aiming at each charge-discharge cycle of the comparison battery pack with the multiplying power, executing the following operations until a battery pack curve corresponding to each charge-discharge cycle of the comparison battery pack with the multiplying power is obtained:
obtaining a cell curve corresponding to each cell in the comparison cell pack with the multiplying power in the current charge-discharge cycle;
obtaining a balance voltage value of the charge-discharge cycle according to a plurality of continuous first voltage difference values entering the uplifting region in any cell curve; the raising area is an area where a balanced voltage value is most likely to appear in the cell curve, and the first voltage difference value is a difference value obtained by subtracting a voltage at a later time point from a voltage at a previous time point in two adjacent time points;
determining the corresponding time when each battery cell curve reaches the balance voltage value of the charge-discharge cycle;
and determining the battery cell curve which reaches the balance voltage value of the charge-discharge cycle at the latest as a battery pack curve corresponding to the charge-discharge cycle of the contrast battery pack with the multiplying power.
6. The method according to claim 4, wherein obtaining the equilibrium voltage value of the current charge-discharge cycle according to a plurality of continuous first voltage difference values entering a raise region in any one of the cell curves comprises:
obtaining a first voltage difference value positioned in the middle of each first voltage difference value according to a plurality of continuous first voltage difference values entering a rising area in any one cell curve;
averaging the voltage of the later time point corresponding to the first voltage difference value in the middle and the voltage of the previous time point to obtain an average value;
and determining the average value as the balance voltage value of the current charge-discharge cycle.
7. The method of claim 5, wherein determining the voltage difference corresponding to each of the equilibrium voltage values as the equilibrium voltage difference corresponding to each charge-discharge cycle of the control battery pack of the rate comprises:
and aiming at each charge-discharge cycle of the comparison battery pack with the multiplying power, executing the following operations until obtaining the balance voltage difference corresponding to each charge-discharge cycle of the comparison battery pack with the multiplying power:
determining the minimum voltage difference of the comparison battery pack with the multiplying power at the time point in the charge-discharge cycle according to any one time point of the obtained balance voltage value of the charge-discharge cycle;
and determining the minimum voltage difference as the balance voltage difference corresponding to the current charge-discharge cycle of the comparison battery pack with the multiplying power.
8. The method according to any one of claims 1-6, wherein if it is monitored that any current power parameter in the target battery pack exceeds the corresponding balance power parameter, controlling the target battery pack to enter a charge balance mode to achieve balanced charging of the target battery pack comprises:
if the minimum voltage in the target battery pack is monitored to exceed the balance voltage value, controlling the target battery pack to enter a charge balance mode so as to realize the balance charging of the target battery pack;
or,
and if the minimum voltage difference in the target battery pack is monitored to exceed the balance voltage difference, controlling the target battery pack to enter a charge balance mode so as to realize the balance charging of the target battery pack.
9. The method of claim 1, wherein the controlling the target battery pack to enter a charge balancing mode comprises:
controlling at least one target battery cell in the target battery pack to be connected with a discharge circuit, and discharging the target battery cell while charging the target battery cell;
the target battery cell is a battery cell with voltage higher than that of preset battery cells in the target battery pack, and the unit charging current of the target battery cell during charging is larger than the unit discharging current of the target battery cell during discharging.
10. A battery pack charge balance control apparatus in a battery management system, the apparatus comprising:
the times and multiplying power acquisition module is used for acquiring the cycle times and the charging multiplying power of the current charging and discharging cycle of the target battery pack when the target battery pack is charged, wherein the cycle times refer to the times of charging the battery pack from zero electric quantity to full electric quantity and then discharging the battery pack to zero electric quantity;
the balance voltage value determining module is used for determining at least one balance power parameter corresponding to the cycle number according to a pre-stored index table, the cycle number and the charging rate, wherein the balance power parameter is a power parameter which meets the requirement that the battery management system controls the target battery pack to enter a charging balance mode, and the index table stores the mapping relation among the charging rate, the cycle number and each balance power parameter in actual charging and discharging cycles of a comparison battery pack which is consistent with the model of the target battery pack;
and the charge balance control module is used for controlling the target battery pack to enter a charge balance mode to realize charge balance of the target battery pack if any current power parameter in the target battery pack exceeds the corresponding balance power parameter.
11. A battery management system, comprising: a processor, and a memory communicatively coupled to the processor;
the memory stores computer-executable instructions;
the processor executes computer-executable instructions stored by the memory to implement the method of any of claims 1-9.
12. A computer-readable storage medium having computer-executable instructions stored therein, which when executed by a processor, are configured to implement the method of any one of claims 1-9.
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| CN112688386A (en) * | 2020-12-16 | 2021-04-20 | 珠海格力电器股份有限公司 | Balance control method, device, equipment, storage medium and power supply system |
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| CN114629212A (en) * | 2022-04-11 | 2022-06-14 | 哈尔滨理工大学 | Quick charging method and device for lithium ion battery |
| CN114744728A (en) * | 2022-05-10 | 2022-07-12 | 深圳阿尔木创新科技有限公司 | Management and control method, charger and system based on android balance charging |
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