A battery equalization method, system, and vehicle

Abstract

A battery equalization method, system and vehicle, comprising: determining a target state of charge of a battery cell to be equalized when a battery equalization condition is met; and controlling the battery cell to be equalized to equalize according to the target state of charge; wherein the target state of charge is determined according to the electric quantity when each battery cell reaches a first state of charge. The battery equalization method provided by the embodiments of the present disclosure determines the target state of charge based on the electric quantity when each battery cell reaches the first state of charge, realizes top alignment, and when the battery pack is fully charged, more battery cells can reach the full charging condition, thereby improving the battery state estimation accuracy.

Description

Technical Field

[0001] This disclosure relates to a battery balancing method, system, and vehicle. Background Technology

[0002] In related technologies, during battery balancing, the battery cell with the lowest voltage is identified, and the voltage difference information between the other battery cells and the battery cell with the lowest voltage is obtained; and the balancing information of the battery cells in each battery module is determined based on the voltage difference information.

[0003] The above balancing method can align the bottoms of individual battery cells. However, this may result in some battery cells not reaching full charge. Summary of the Invention

[0004] This disclosure provides a battery balancing method, system, and vehicle to at least partially solve the above-mentioned problems.

[0005] The first aspect of this disclosure provides a battery balancing method, comprising:

[0006] When the battery balancing conditions are met, determine the target state of charge of the individual battery cells to be balanced; and

[0007] The balance of individual battery cells to be balanced is controlled according to the target state of charge.

[0008] The target state of charge is determined based on the amount of charge of each battery cell when it reaches the first state of charge.

[0009] In some embodiments, the target state of charge is determined based on the amount of charge when all battery cells reach the first state of charge, including: the target state of charge is determined based on the amount of charge when the battery cell with the lowest voltage and the battery cell to be balanced reach the first state of charge.

[0010] In some embodiments, the target state of charge is determined according to the following formula:

[0011]

[0012] in, Let i be the target state of charge of the i-th battery cell to be balanced. The first state of charge, This represents the actual capacity of the battery cell with the lowest voltage. Let i be the actual capacity of the i-th battery cell to be balanced. i represents the actual state of charge of the battery cell with the lowest voltage, where i is a positive integer.

[0013] In some embodiments, the first state of charge is 100%.

[0014] In some embodiments, controlling the equalization of the individual battery cells to be equalized according to the target state of charge includes:

[0015] Determine the equalization amount based on the target state of charge; and

[0016] The equalization of individual battery cells is controlled according to the equalization amount.

[0017] In some embodiments, determining the equalization amount based on the target state of charge includes: determining the equalization amount based on the target state of charge and the actual state of charge.

[0018] In some embodiments, the balancing amount is determined according to the following formula:

[0019]

[0020] in, For the balance quantity, This represents the actual state of charge of the i-th battery cell to be balanced. Let i be the target state of charge of the i-th battery cell to be balanced. Let be the actual capacity of the i-th battery cell to be balanced, where i is a positive integer.

[0021] In some embodiments, the battery equalization conditions include: time conditions, state of charge conditions or voltage conditions, signal conditions, and equalization channel conditions.

[0022] In some embodiments, satisfying the battery balancing condition includes:

[0023] The battery resting time is greater than or equal to the first duration;

[0024] The state of charge of the battery pack is less than or equal to the second state of charge, or the lowest voltage among all individual battery cell voltages is less than or equal to the first voltage.

[0025] The signal is valid, wherein the signal includes at least one of the following signals: a voltage signal, a temperature signal, a time signal; and

[0026] The equalization channel is functioning normally.

[0027] The battery balancing method provided in this disclosure determines the target state of charge based on the charge level of each battery cell when it reaches the first state of charge, thus achieving top alignment. When the battery pack is fully charged, more battery cells can reach the full charge condition, thereby improving the accuracy of battery state estimation.

[0028] This disclosure also provides a battery balancing system, including a memory, a processor, and a computer program stored in the memory, wherein the processor executes the computer program to implement the steps of any of the methods described above.

[0029] This disclosure also provides an electrical device including a memory, a processor, and a computer program stored in the memory, wherein the processor executes the computer program to implement the steps of any of the methods described above.

[0030] This disclosure also provides a computer-readable storage medium having a computer program / instructions stored thereon, which, when executed by a processor, implement the steps of any of the methods described above.

[0031] This disclosure also provides a computer program product, including a computer program / instructions that, when executed by a processor, implement the steps of any of the methods described above.

[0032] This disclosure also provides a vehicle that includes the battery balancing system described in any of the preceding claims.

[0033] The above description is merely an overview of the technical solution disclosed herein. In order to better understand the technical means of this disclosure and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this disclosure more apparent and understandable, specific embodiments of this disclosure are described below. Attached Figure Description

[0034] To more clearly illustrate the technical solutions in the embodiments of this disclosure, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are merely some embodiments of this disclosure. Those skilled in the art can obtain other drawings based on these drawings without any creative effort.

[0035] To gain a more complete understanding of this disclosure and its beneficial effects, the following description will be made in conjunction with the accompanying drawings, wherein the same reference numerals denote the same parts in the following description.

[0036] Figure 1 This is a flowchart illustrating a battery balancing method according to some embodiments. Detailed Implementation

[0037] The technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this disclosure, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this disclosure without creative effort are within the protection scope of this disclosure.

[0038] In the description of this disclosure, it should be understood that the terms "upper," "lower," "left," "right," "front," "rear," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or relative positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this disclosure and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this disclosure. Unless otherwise specified, the above-mentioned orientational descriptions can be flexibly set in practical applications, provided that the relative positional relationships shown in the accompanying drawings are satisfied.

[0039] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this disclosure, unless otherwise stated, "a plurality of" means two or more.

[0040] Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following related objects are in an "or" relationship.

[0041] In the description of this disclosure, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "electrical connection," and "communication" should be interpreted broadly. For example, they can refer to fixed electrical connections, detachable electrical connections, or integral electrical connections. Connections can be direct or indirect through an intermediate medium, and can be internal connections between two components. Those skilled in the art can understand the specific meaning of the above terms in this disclosure according to the specific circumstances.

[0042] In embodiments of this disclosure, the terms "comprising," "including," or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, article, or apparatus that includes that element. Furthermore, it should be noted that the scope of the methods and apparatuses in embodiments of this disclosure is not limited. Functions may be performed in the order shown or discussed, or may be performed substantially simultaneously or in reverse order depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

[0043] In this disclosure, the terms "exemplary" or "for example" are used to indicate that something is an example, illustration, or illustration. Any embodiment or design described as "exemplary" or "for example" in this disclosure should not be construed as being more preferred or advantageous than other embodiments or designs. Rather, the use of terms such as "exemplary" or "for example" is intended to present the relevant concepts in a specific manner.

[0044] In the description of this specification, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0045] In some embodiments, such as Figure 1 As shown, this disclosure provides a battery balancing method, including:

[0046] When the battery balancing conditions are met, determine the target state of charge of the individual battery cells to be balanced; and

[0047] The equalization of individual battery cells to be equalized is controlled according to the target state of charge.

[0048] The target state of charge is determined based on the amount of charge each battery cell has when it reaches the first state of charge.

[0049] The battery balancing method provided in this disclosure determines the target state of charge based on the charge level of each battery cell when it reaches the first state of charge, thus achieving top alignment. When the battery pack is fully charged, more battery cells can reach the full charge condition, thereby improving the accuracy of battery state estimation.

[0050] This disclosure determines the target state of charge by reasonably setting the first state of charge, thereby achieving battery balancing. After the individual battery cells are balanced, all battery cells have the same charge level when they reach the first state of charge, thus achieving top alignment.

[0051] In some embodiments, the target state of charge is determined based on the amount of charge when all individual cells reach the first state of charge, including: the target state of charge is determined based on the amount of charge when the individual cell with the lowest voltage and the individual cells to be balanced reach the first state of charge.

[0052] The battery cells to be balanced are all the battery cells except the one with the lowest voltage.

[0053] The target state of charge can be determined by the amount of charge when the battery cell with the lowest voltage and the battery cell to be balanced both reach the first state of charge. This allows for battery balancing, enabling more battery cells to be fully charged and improving the performance of the battery pack.

[0054] In some embodiments, the target state of charge is determined according to the following formula:

[0055]

[0056] in, Let i be the target state of charge of the i-th battery cell to be balanced. The first state of charge, This represents the actual capacity of the battery cell with the lowest voltage. Let i be the actual capacity of the i-th battery cell to be balanced. i represents the actual state of charge of the battery cell with the lowest voltage, where i is a positive integer.

[0057] By taking the amount of charge of the battery cell with the lowest voltage from its actual state of charge to its first state of charge as the standard, the state of charge of other battery cells when they reach the first state of charge can be determined, and this state of charge is the target state of charge.

[0058] The formula for the target state of charge is derived from the following formula:

[0059]

[0060] In some embodiments, the first state of charge is 100%.

[0061] To achieve better performance, the first state of charge can be set as high as possible, such as 100%, so that more individual cells can be fully charged, thus improving the performance of the battery pack.

[0062] In some embodiments, controlling the balancing of individual battery cells to be balanced according to the target state of charge includes:

[0063] Determine the equilibrium quantity based on the target state of charge; and

[0064] The equalization of individual battery cells is controlled based on the equalization quantity.

[0065] The balancing amount can be determined by the target state of charge, and battery balancing can be achieved based on the balancing amount, making the control scheme simpler.

[0066] In some embodiments, determining the equalization amount based on the target state of charge includes: determining the equalization amount based on the target state of charge and the actual state of charge.

[0067] The equalization quantity is determined by comparing the target state of charge and the actual state of charge. In other words, the difference between the target state of charge and the actual state of charge can be determined, and the difference in electrical charge can be determined based on this difference. This current difference is the equalization quantity. The solution is simple and easy to implement.

[0068] In some embodiments, the balance amount is determined according to the following formula:

[0069]

[0070] in, For the balance quantity, This represents the actual state of charge of the i-th battery cell to be balanced. Let i be the target state of charge of the i-th battery cell to be balanced. Let be the actual capacity of the i-th battery cell to be balanced, where i is a positive integer.

[0071] The above formula can be used to easily and conveniently determine the balancing amount of a single battery cell to be balanced, so as to facilitate battery balancing.

[0072] Those skilled in the art can achieve balancing in various suitable ways based on the balancing amount, such as through discharge.

[0073] In some embodiments, battery equalization conditions include: time conditions, state of charge conditions or voltage conditions, signal conditions, and equalization channel conditions.

[0074] Battery equalization conditions can be various suitable conditions, such as time conditions, state of charge conditions or voltage conditions, signal conditions and equalization channel conditions.

[0075] In some embodiments, satisfying the battery balancing condition includes:

[0076] The battery resting time is greater than or equal to the first duration;

[0077] The state of charge of the battery pack is less than or equal to the second state of charge, or the lowest voltage among all individual battery cell voltages is less than or equal to the first voltage.

[0078] The signal is valid, wherein the signal includes at least one of the following signals: a voltage signal, a temperature signal, a time signal; and

[0079] The equalization channel is functioning normally.

[0080] After charging and discharging, the battery pack enters a resting state. Once the resting time meets the required conditions, state-of-charge correction can be triggered. The lower the ambient temperature, the longer the resting time required for voltage stabilization. The resting time at different temperatures should be determined based on the test results of individual battery cells. The initial resting time can be any suitable duration, chosen based on achieving voltage stability.

[0081] The OCV (Open Circuit Voltage)-SOC (State of Charge) curve of a battery pack exhibits multiple plateau regions. Within the middle plateau range, the slope of voltage change with SOC is relatively low. Determining SOC based on voltage within this range results in significant errors, leading to substantial errors in calculating the target SOC for equalization. This can result in insufficient or excessive equalization. A suitable voltage threshold (the first voltage, corresponding to the second state of charge) can be selected based on the OCV-SOC curve for equalization judgment.

[0082] In other words, the solution in this embodiment achieves top alignment through low-end equalization, which allows more individual battery cells to reach full charge, thus improving battery pack performance.

[0083] When the above conditions are met simultaneously, balance control can begin, which can make balance control more accurate and avoid problems such as insufficient balance or over-balance.

[0084] The battery balancing method provided in this disclosure determines the target state of charge based on the charge level of each battery cell when it reaches the first state of charge, thus achieving top alignment. When the battery pack is fully charged, more battery cells can reach the full charge condition, thereby improving the accuracy of battery state estimation.

[0085] This disclosure also provides a battery balancing system, including a memory, a processor, and a computer program stored in the memory, wherein the processor executes the computer program to implement the steps of any of the above methods.

[0086] This disclosure also provides an electrical device including a memory, a processor, and a computer program stored in the memory, wherein the processor executes the computer program to implement the steps of any of the above methods.

[0087] This disclosure also provides a computer-readable storage medium having a computer program / instructions stored thereon, which, when executed by a processor, implement the steps of any of the above methods.

[0088] This disclosure also provides a computer program product, including a computer program / instructions that, when executed by a processor, implement the steps of any of the above methods.

[0089] This disclosure also provides a vehicle that includes the battery balancing system described above.

[0090] It should be noted that the aforementioned electrical equipment can be any conventionally power-consuming equipment, such as, but not limited to, controllers, vehicles, skateboard chassis, ships, drones, mobile phones, computers, air conditioners, refrigerators, washing machines, microwave ovens, printers, fax machines, etc.

[0091] The embodiments of this disclosure have been described above with reference to the accompanying drawings. However, this disclosure is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this disclosure without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this disclosure.

Claims

1. A battery balancing method, characterized in that, include: When the battery balancing conditions are met, the target state of charge of the individual battery cells to be balanced is determined. as well as The balance of individual battery cells to be balanced is controlled according to the target state of charge. The target state of charge is determined based on the amount of charge of each battery cell when it reaches the first state of charge.

2. The battery balancing method according to claim 1, characterized in that, The target state of charge is determined based on the charge level of each battery cell when all cells reach the first state of charge, including: the target state of charge is determined based on the charge level of the battery cell with the lowest voltage and the battery cell to be balanced when all cells reach the first state of charge.

3. The battery balancing method according to claim 1, characterized in that, The target state of charge is determined according to the following formula: in, Let i be the target state of charge of the i-th battery cell to be balanced. The first state of charge, This represents the actual capacity of the battery cell with the lowest voltage. Let i be the actual capacity of the i-th battery cell to be balanced. i represents the actual state of charge of the battery cell with the lowest voltage, where i is a positive integer.

4. The battery balancing method according to claim 1, characterized in that, The first state of charge is 100%.

5. The battery balancing method according to claim 1, characterized in that, The step of controlling the equalization of individual battery cells according to the target state of charge includes: Determine the equalization amount based on the target state of charge; and The equalization of individual battery cells is controlled according to the equalization amount.

6. The battery balancing method according to claim 5, characterized in that, The step of determining the equalization amount based on the target state of charge includes: determining the equalization amount based on the target state of charge and the actual state of charge.

7. The battery balancing method according to claim 5, characterized in that, The equilibrium amount is determined according to the following formula: in, For the balance quantity, This represents the actual state of charge of the i-th battery cell to be balanced. Let i be the target state of charge of the i-th battery cell to be balanced. Let be the actual capacity of the i-th battery cell to be balanced, where i is a positive integer.

8. The battery balancing method according to claim 1, characterized in that, The battery equalization conditions include: time conditions, state of charge conditions or voltage conditions, signal conditions, and equalization channel conditions.

9. The battery balancing method according to claim 8, characterized in that, The conditions for satisfying battery balancing include: The battery resting time is greater than or equal to the first duration; The state of charge of the battery pack is less than or equal to the second state of charge, or the lowest voltage among all individual battery cell voltages is less than or equal to the first voltage. The signal is valid, wherein the signal includes at least one of the following signals: a voltage signal, a temperature signal, a time signal; and The equalization channel is functioning normally.

10. A battery balancing system, comprising a memory, a processor, and a computer program stored in the memory, characterized in that, The processor executes the computer program to implement the steps of the method according to any one of claims 1-9.

11. A computer-readable storage medium having a computer program / instructions stored thereon, characterized in that, When the computer program / instructions are executed by the processor, they implement the steps of the method according to any one of claims 1-9.

12. A computer program product comprising a computer program / instructions, characterized in that, When the computer program / instructions are executed by the processor, they implement the steps of the method according to any one of claims 1-9.

13. A vehicle, characterized in that, include: The battery balancing system as described in claim 10.

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