Battery self-adaptive equalization method, terminal and power supply device

Abstract

The application provides a battery adaptive equalization method, a terminal and a power supply device. The method comprises the following steps: obtaining the unbalance degree of each single battery in a battery module; regarding the single battery with the unbalance degree exceeding a first preset threshold as a battery to be adjusted, and determining a corresponding equalization current according to the battery temperature of each battery to be adjusted; the battery temperature is negatively correlated with the equalization current; controlling each battery to be adjusted to supply power to a corresponding passive equalization load by using the corresponding equalization current, until the unbalance degree of each battery to be adjusted does not exceed the first preset threshold. The above method realizes adaptive passive equalization of the single battery, thereby improving the passive equalization efficiency of the battery.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery, in particular to a battery adaptive equalization method, a terminal and a power supply device. BACKGROUND

[0002] Passive equalization generally discharges the single battery with higher voltage by the way of resistance discharge, releases the electric quantity in the form of heat, and strives for more charging time for other single batteries, so as to improve the inconsistency of voltage and power among the battery single.

[0003] The existing passive equalization strategy generally adopts a fixed equalization small current to discharge the equalization resistance. In this way, in a 3.2 Ah battery module, if passive equalization is performed on 1% imbalance, 32h may be needed, and the value will be multiplied as the imbalance increases, which greatly reduces the passive equalization efficiency. SUMMARY

[0004] Embodiments of the present application provide a battery adaptive equalization method, a terminal and a power supply device to solve the problem of low efficiency of passive equalization of the prior art.

[0005] In a first aspect, embodiments of the present application provide a battery adaptive equalization method, comprising:

[0006] Obtaining the imbalance of each single battery in the battery module;

[0007] Taking the single battery with imbalance exceeding a first preset threshold as a to-be-adjusted battery, and determining a corresponding equalization current according to the battery temperature of each to-be-adjusted battery; the battery temperature is negatively correlated with the equalization current;

[0008] Controlling each to-be-adjusted battery to supply power to a corresponding passive equalization load by using the corresponding equalization current, until the imbalance of each to-be-adjusted battery does not exceed the first preset threshold.

[0009] In a second aspect, embodiments of the present application provide a terminal, comprising a memory, a processor and a computer program stored in the memory and executable on the processor, and the processor executes the computer program to realize the steps of the method according to any possible implementation manner of the first aspect.

[0010] In a third aspect, embodiments of the present application provide a power supply device comprising the terminal according to the second aspect.

[0011] The embodiment of the present application provides a battery adaptive equalization method, a terminal and a power supply device, the method first acquires the unbalance degree of each single battery in a battery module; then, the single battery with the unbalance degree exceeding a first preset threshold is regarded as a to-be-adjusted battery, and a corresponding equalization current is determined according to the battery temperature of each to-be-adjusted battery; the battery temperature is negatively correlated with the equalization current; finally, each to-be-adjusted battery is controlled to supply power to a corresponding passive equalization load by using the corresponding equalization current, until the unbalance degree of each to-be-adjusted battery does not exceed the first preset threshold. The above method improves the defect that passive equalization can only be performed by using a small equalization current in the prior art, and by adjusting the equalization current in multiple gears according to the battery temperature, the passive equalization efficiency can be effectively improved compared with the prior art, the equalization time is reduced, and the problem that directly increasing the equalization current can cause the battery temperature to rise rapidly and reduce the battery life is also avoided, so that adaptive passive equalization of the single battery is realized, and the passive equalization efficiency of the battery is improved. BRIEF DESCRIPTION OF DRAWINGS

[0012] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0013] Figure 1 is the implementation flowchart of the battery adaptive equalization method provided by the embodiment of the present application;

[0014] Figure 2 is a curve diagram of the battery temperature-equalization current provided by the embodiment of the present application;

[0015] Figure 3 is a schematic diagram of the installation position of the temperature sensor in the battery module provided by the embodiment of the present application;

[0016] Figure 4 is a structural schematic diagram of the battery adaptive equalization device provided by the embodiment of the present application;

[0017] Figure 5 is a schematic diagram of the terminal provided by the embodiment of the present application. DETAILED DESCRIPTION

[0018] In the following description, for purposes of explanation and not limitation, specific details are set forth such as particular architectures, techniques, etc. in order to provide a thorough understanding of the embodiments of the present application. However, it will be apparent to those skilled in the art that the present application can be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known methods, devices, circuits, and

[0019] In order to make the objects, technical solutions and advantages of the present application clearer, the following will be described in detail with reference to the accompanying drawings.

[0020] Referring to Figure 1 which shows an implementation flowchart of the battery adaptive equalization method provided by the embodiment of the present application, and the details are as follows:

[0021] S101: Obtain the unbalance degree of each single battery in the battery module.

[0022] Specifically, the execution subject of the embodiment can be a controller of a power supply device. The controller obtains the resting voltage of each single battery in the battery module, and determines the unbalance degree of each single battery according to the resting voltage of each single battery.

[0023] Specifically, the controller can use the formula to determine the unbalance degree of each single battery, wherein V i represents the resting voltage of the i-th single battery, V min represents the minimum resting voltage of the single battery in the battery module.

[0024] In one possible implementation, the specific implementation process of S101 includes:

[0025] based on the formula to calculate the unbalance degree of each single battery;

[0026] wherein SOC i represents the remaining capacity of the i-th single battery, SOC min represents the minimum value of the remaining capacity of each single battery.

[0027] S102: Take the single battery whose unbalance degree exceeds the first preset threshold as a to-be-adjusted battery, and determine the corresponding equalization current according to the battery temperature of each to-be-adjusted battery; the battery temperature and the equalization current are negatively correlated.

[0028] In the embodiment, in order to reduce the unbalance degree of part of the single batteries, the power of the single battery with a large unbalance degree of load consumption can be set individually, so that the single battery with a large unbalance degree outputs an equalization current to the load for passive equalization while charging and discharging. Different from the charging and discharging current of the single battery, the equalization current is the current of the single battery discharging to the passive equalization load.

[0029] Specifically, the first preset threshold can be 3%, that is, when the unbalance degree of the single battery is greater than 3%, the single battery is taken as a battery to be adjusted, and passive equalization is performed on the battery to be adjusted.

[0030] When passive equalization is performed on the battery to be adjusted, the corresponding equalization current can be determined based on the battery temperature. For example, Figure 2 Figure 2 An equalization current-battery temperature diagram provided by the embodiment is shown. Referring to Figure 2 Since the greater the equalization current is, the faster the temperature of the single battery rises, the equalization current of the single battery can be controlled to decrease with the increase of the battery temperature when the battery temperature is less than the upper limit value T1 of the temperature, and the single battery is controlled to follow the conventional equalization current i c to discharge.

[0031] For example, the size of the conventional equalization current is 200mA, and when the battery temperature of the single battery is lower than the upper limit value of the temperature, the equalization current can be controlled to adjust to 500mA or 1A.

[0032] In one possible implementation, the specific implementation process of S102 includes:

[0033] determining whether the battery temperature of the first battery to be adjusted in the current period is greater than a first temperature threshold; the first battery to be adjusted is any battery to be adjusted;

[0034] if the battery temperature of the first battery to be adjusted in the current period is greater than the first temperature threshold, setting the equalization current of the first battery to be adjusted in the current period as a first equalization current;

[0035] if the battery temperature of the first battery to be adjusted in the current period is not greater than the first temperature threshold, setting the equalization current of the first battery to be adjusted in the current period as a second equalization current;

[0036] The first equalization current is less than the second equalization current.

[0037] ​Specifically, the size of the equalization current can be determined by the first temperature threshold, the equalization current is divided into the first equalization current and the second equalization current, and the single battery is controlled to be passively equalized. This method can not only realize the effect of increasing the equalization current to accelerate the adaptive equalization rate in a low-temperature environment, but also is simple to calculate and easy to implement.

[0038] In addition, the above method can adjust the equalization current in real time based on the battery temperature of the to-be-adjusted battery in each period, and realize adaptive passive equalization of the battery.

[0039] In one possible implementation, another implementation process of S102 includes:

[0040] determining an equalization current adjustment amount of the current period according to a battery temperature change rate of the first to-be-adjusted battery in the current period; the battery temperature change rate is positively correlated with the equalization current adjustment amount;

[0041] subtracting the equalization current adjustment amount of the current period from the equalization current of the previous period as the equalization current of the current period.

[0042] Specifically, the battery temperature of the current period is subtracted from the battery temperature of the previous period, and the difference is divided by the battery temperature of the previous period to obtain the temperature change rate of the current period. If the temperature change rate is larger, it means that the rate of temperature rise of the battery is faster, and the reduction amount of the equalization current is larger, so as to ensure that the single battery will not cause a situation of excessively high temperature due to passive equalization. If the temperature change rate is smaller, it means that the rate of temperature rise of the battery is smaller, and the reduction amount of the equalization current is smaller, so that the single battery can be passively equalized with a larger equalization current, thereby improving the passive equalization efficiency of the single battery.

[0043] In one possible implementation, still another implementation process of S102 includes:

[0044] determining a corresponding equalization current according to the battery temperature of the first to-be-adjusted battery in the current period, and the battery temperature of the first to-be-adjusted battery is negatively correlated with the equalization current; the first to-be-adjusted battery is any to-be-adjusted battery;

[0045] if the environmental temperature of the current period is greater than the second preset temperature, the equalization current of the first to-be-adjusted battery in the current period is reduced;

[0046] if the environmental temperature of the current period is less than the third preset temperature, the equalization current of the first to-be-adjusted battery in the current period is increased;

[0047] The third preset temperature is less than the second preset temperature.

[0048] Specifically, the temperature of the single battery is also affected by the ambient temperature. The higher the ambient temperature, the faster the temperature rising rate of the single battery. Therefore, at this time, the original equalization current can be slightly reduced to reduce the temperature rising rate of the battery, avoid the battery temperature rising too fast (when the battery temperature reaches the temperature upper limit value, the single battery can only be passively equalized with the equalization current of the conventional size or stop passive equalization), shorten the time of passive equalization with large equalization current, improve the control accuracy of the equalization current, and further improve the passive equalization efficiency of the single battery.

[0049] S103: Control each to-be-adjusted battery to supply power to the corresponding passive equalization load with the corresponding equalization current, until the unbalance degree of each to-be-adjusted battery does not exceed the first preset threshold.

[0050] Specifically, the passive equalization load can be an adjustable resistor, and the corresponding equalization current can be adjusted by adjusting the adjustable resistor. It can be understood that the passive equalization load can also be other electronic devices that can consume power.

[0051] Since the passive equalization load is used to absorb the power of the single battery with a large unbalance degree during passive equalization, in the equalization mode on state, no matter whether the battery module is currently in a charging state or a discharging state, the battery module will present a slow discharging condition when charging and a fast discharging condition when discharging.

[0052] In one possible implementation, the specific implementation process of S103 includes:

[0053] The equalization current of the first to-be-adjusted battery is adjusted by adjusting the resistance of the passive equalization load connected to the first to-be-adjusted battery. The first to-be-adjusted battery is any to-be-adjusted battery. In addition, the overall resistance of the passive equalization load can also be changed by adjusting the number of resistors connected to the equalization loop.

[0054] In one possible implementation, in order to improve the passive equalization efficiency, after the equalization current is determined based on the battery temperature of the to-be-adjusted battery, the equalization current can also be fine-tuned based on the unbalance degree, that is, the fine-tuning amount is determined based on the unbalance degree, and the unbalance degree and the fine-tuning amount are positively correlated, and then the equalization current is added to the fine-tuning amount to obtain the adjusted equalization current.

[0055] In one possible implementation, a temperature sensor is arranged between at least two adjacent single batteries in the battery module, and the temperature sensor is used to collect the battery temperature of the corresponding at least two adjacent single batteries; and another implementation process of S102 includes:

[0056] The corresponding equalization current is determined based on the battery temperature of the first to-be-adjusted battery, the temperature of the passive equalization load corresponding to the first to-be-adjusted battery, and the unbalance degree of the first to-be-adjusted battery.

[0057] Specifically, in order to realize the battery adaptive equalization method provided by the embodiment, a temperature sensor is installed between the positive and negative electrodes of each single battery to measure the battery temperature of the single battery in the optimal case, but this method will cause excessive additional hardware investment and high cost. In actual cases, the temperature sensors of each single battery in the battery module are generally not one-to-one corresponding relationship of one single battery to one temperature sensor, because for the general battery temperature monitoring application scenario, the many-to-one temperature collection relationship can meet the actual application requirements. Therefore, in order to realize the accurate adjustment of the equalization current of the single battery with different temperatures on the basis of many-to-one single battery temperature collection and reduce the hardware cost, the following scheme is adopted.

[0058] The embodiment measures at least two adjacent single batteries by using one temperature sensor, that is, the battery temperatures measured by the at least two adjacent single batteries are the same. For example, when two adjacent single batteries share one temperature sensor to measure the battery temperature, the temperature sensor can be connected at the position of Figure 2 , the temperature between the negative and positive electrodes of the two adjacent temperature sensors is measured to determine the battery temperature of the two adjacent single batteries. Although this method reduces the amount of additional hardware access, the measurement accuracy is not accurate enough to determine the temperature difference of the two adjacent single batteries. In this case, if the temperature collected by the temperature sensor is directly used as the basis for adjusting the equalization current, it may cause the two single batteries with actual temperature difference to have the same equalization current in any case, which is particularly unfavorable in the case of two single batteries adjacent to each other, and may cause unnecessary temperature accumulation, which is not conducive to the realization of differentiated equalization and adaptive equalization of each single battery.

[0059] The embodiment can obtain the battery temperature measured by the temperature sensor corresponding to the battery to be adjusted and the input end temperature of the passive equalization load, and perform weighted summation on the battery temperature and the input end temperature to obtain the comprehensive temperature of the battery to be adjusted. Finally, the corresponding equalization current is determined according to the comprehensive temperature. Generally, the higher the input end temperature of the passive equalization load, the higher the temperature of the corresponding single battery, so the temperature of the single battery can be indirectly determined based on the input end temperature of the passive equalization load.

[0060] The passive equalization load is arranged on the BMS (Battery Management System, battery management system) circuit board, and the temperature measurement is relatively convenient.

[0061] Based on this, the equalization current can be fine-tuned based on the degree of imbalance. That is, the fine adjustment amount is determined based on the degree of imbalance, and the degree of imbalance is positively correlated with the fine adjustment amount. Then, the equalization current is added to the fine adjustment amount to obtain the adjusted equalization current.

[0062] Therefore, by introducing the imbalance of each individual cell and the temperature of the passive load balancing, this embodiment can effectively distinguish the balancing status of each individual cell and avoid the situation where multiple individual cells are uniformly balanced.

[0063] In one possible implementation, the specific implementation process of S102 above further includes:

[0064] The combined temperature of the first battery to be regulated is obtained by weighted summing of the battery temperature and the temperature of the passive balancing load corresponding to the first battery to be regulated.

[0065] The imbalance of the first battery to be adjusted is converted into a temperature compensation value;

[0066] The final temperature of the first battery to be regulated is obtained by subtracting the temperature compensation value from the overall temperature, and the corresponding equalization current is determined based on the final temperature of the first battery to be regulated; the final temperature is negatively correlated with the equalization current.

[0067] Specifically, the temperature compensation value is positively correlated with the degree of unevenness, that is, the temperature compensation value increases as the degree of unevenness increases.

[0068] The above method can improve the passive balancing efficiency of the battery while ensuring the safe operation of each individual battery cell, without adding too much additional hardware, reducing costs, and making it more widely applicable.

[0069] It should be understood that the sequence number of each step in the above embodiments does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

[0070] The following are device embodiments of the present invention. For details not described in detail, please refer to the corresponding method embodiments described above.

[0071] Figure 4 A schematic diagram of the battery adaptive balancing device provided in an embodiment of the present invention is shown. For ease of explanation, only the parts related to the embodiment of the present invention are shown, and are described in detail below:

[0072] like Figure 4 As shown, the battery adaptive equalization device 100 includes:

[0073] The imbalance calculation module 110 is used to obtain the imbalance of each individual cell in the battery module.

[0074] The equalization current calculation module 120 is used to identify individual cells with an imbalance degree exceeding a first preset threshold as cells to be adjusted, and to determine the corresponding equalization current based on the cell temperature of each cell to be adjusted; the cell temperature is negatively correlated with the equalization current.

[0075] The passive balancing module 130 is used to control each battery to be regulated to supply power to the corresponding passive balancing load using its own corresponding balancing current, until the imbalance of each battery to be regulated does not exceed the first preset threshold.

[0076] In one possible implementation, the equalization current calculation module 120 includes:

[0077] Determine whether the battery temperature of the first battery to be regulated in the current cycle is greater than a first temperature threshold; the first battery to be regulated can be any battery to be regulated.

[0078] If the battery temperature of the first battery to be regulated is greater than the first temperature threshold in the current cycle, then the equalization current of the first battery to be regulated in the current cycle is set as the first equalization current.

[0079] If the battery temperature of the first battery to be regulated in the current cycle is not greater than the first temperature threshold, then the equalization current of the first battery to be regulated in the current cycle is set as the second equalization current.

[0080] The first equalizing current is less than the second equalizing current.

[0081] In one possible implementation, the equalization current calculation module 120 includes:

[0082] The equalization current adjustment amount for the current cycle is determined based on the battery temperature change rate of the first battery to be adjusted in the current cycle; the battery temperature change rate is positively correlated with the equalization current adjustment amount.

[0083] The equalization current of the current cycle is obtained by subtracting the equalization current adjustment amount of the current cycle from the equalization current of the previous cycle.

[0084] In one possible implementation, the imbalance calculation module 110 includes:

[0085] Based on formula Calculate the imbalance of each individual cell;

[0086] Among them, SOC i State of Charge (SOC) represents the remaining charge of the i-th individual cell. min This represents the minimum remaining charge in each individual battery cell.

[0087] In one possible implementation, the equalization current calculation module 120 includes:

[0088] The corresponding equalization current is determined based on the battery temperature of the first battery to be regulated in the current cycle, and the battery temperature of the first battery to be regulated is negatively correlated with the equalization current; the first battery to be regulated can be any battery to be regulated.

[0089] If the ambient temperature of the current cycle is greater than the second preset temperature, then reduce the equalization current of the first battery to be regulated in the current cycle.

[0090] If the ambient temperature of the current cycle is lower than the third preset temperature, then increase the equalization current of the first battery to be regulated in the current cycle.

[0091] The third preset temperature is lower than the second preset temperature.

[0092] In one possible implementation, the passive equalization module 130 includes:

[0093] The balancing current of the first battery to be regulated is adjusted by adjusting the resistance of the passive balancing load connected to the first battery to be regulated, where the first battery to be regulated can be any battery to be regulated.

[0094] In one possible implementation, a temperature sensor is disposed between at least two adjacent individual cells in the battery module, the temperature sensor being used to collect the battery temperature of the corresponding at least two adjacent individual cells; the equalization current calculation module includes:

[0095] The corresponding balancing current is determined based on the battery temperature of the first battery to be regulated, the temperature of the passive balancing load corresponding to the first battery to be regulated, and the degree of imbalance of the first battery to be regulated.

[0096] In one possible implementation, the equalization current calculation module 120 further includes:

[0097] The combined temperature of the first battery to be regulated is obtained by weighted summing of the battery temperature and the temperature of the passive balancing load corresponding to the first battery to be regulated.

[0098] The imbalance of the first battery to be adjusted is converted into a temperature compensation value;

[0099] The final temperature of the first battery to be regulated is obtained by subtracting the temperature compensation value from the overall temperature, and the corresponding equalization current is determined based on the final temperature of the first battery to be regulated; the final temperature is negatively correlated with the equalization current.

[0100] The aforementioned device enables adaptive passive balancing of individual cells, thereby improving the efficiency of passive battery balancing.

[0101] Figure 5 This is a schematic diagram of a terminal provided in an embodiment of the present invention. Figure 5 As shown, the terminal 5 in this embodiment includes a processor 50 and a memory 51. The memory 51 stores a computer program 52, and the processor 50 calls and runs the computer program 52 stored in the memory 51 to execute the steps in the various battery adaptive balancing method embodiments described above, for example... Figure 1 The steps S101 to S103 are shown. Alternatively, the processor 50 is used to call and run the computer program 52 stored in the memory 51 to implement the functions of each module / unit in the above-described device embodiments, for example... Figure 4 The functions of modules 110 to 130 are shown.

[0102] For example, the computer program 52 can be divided into one or more modules / units, which are stored in the memory 51 and executed by the processor 50 to complete the present invention. The one or more modules / units can be a series of computer program instruction segments capable of performing a specific function, which describe the execution process of the computer program 52 in the terminal 5. For example, the computer program 52 can be divided into... Figure 4 Modules 110 to 130 are shown.

[0103] The terminal 5 may include, but is not limited to, a processor 50 and a memory 51. Those skilled in the art will understand that... Figure 5 This is merely an example of terminal 5 and does not constitute a limitation on terminal 5. It may include more or fewer components than shown, or combine certain components, or different components. For example, the terminal may also include input / output devices, network access devices, buses, etc.

[0104] The processor 50 may be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor.

[0105] The memory 51 can be an internal storage unit of the terminal 5, such as a hard disk or memory of the terminal 5. The memory 51 can also be an external storage device of the terminal 5, such as a plug-in hard disk, Smart Media Card (SMC), Secure Digital (SD) card, or Flash Card equipped on the terminal 5. Furthermore, the memory 51 can include both internal storage units and external storage devices of the terminal 5. The memory 51 is used to store the computer program and other programs and data required by the terminal. The memory 51 can also be used to temporarily store data that has been output or will be output.

[0106] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional units and modules is merely an example. In practical applications, the above functions can be assigned to different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiments can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit. Furthermore, the specific names of the functional units and modules are only for easy differentiation and are not intended to limit the scope of protection of this application. The specific working process of the units and modules in the above system can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0107] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail or recorded in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0108] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementations should not be considered beyond the scope of this invention.

[0109] In one possible implementation, this embodiment provides a power supply device that includes the terminal described above.

[0110] In the embodiments provided by this invention, it should be understood that the disclosed devices / terminals and methods can be implemented in other ways. For example, the device / terminal embodiments described above are merely illustrative. For instance, the division of modules or units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between devices or units may be electrical, mechanical, or other forms.

[0111] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0112] Furthermore, the functional units in the various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0113] If the integrated module / unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, all or part of the processes in the above embodiments of the present invention can also be implemented by a computer program instructing related hardware. The computer program can be stored in a computer-readable storage medium, and when executed by a processor, it can implement the steps of the various battery adaptive balancing method embodiments described above. The computer program includes computer program code, which can be in the form of source code, object code, executable files, or certain intermediate forms. The computer-readable medium can include: any entity or device capable of carrying the computer program code, recording media, USB flash drives, portable hard drives, magnetic disks, optical disks, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signals, telecommunication signals, and software distribution media, etc. It should be noted that the content included in the computer-readable medium can be appropriately added or removed according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, the computer-readable medium does not include electrical carrier signals and telecommunication signals.

[0114] The above-described embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included within the protection scope of the present invention.

Claims

1. A battery adaptive equalization method, characterized in that, include: Obtain the imbalance of each individual cell in the battery module; Individual cells with an imbalance exceeding a first preset threshold are designated as cells to be regulated, and a corresponding equalization current is determined based on the cell temperature of each cell to be regulated; the cell temperature is negatively correlated with the equalization current. Control each battery to be adjusted to supply power to the corresponding passive balancing load using its own corresponding equalization current until the imbalance of each battery to be adjusted does not exceed the first preset threshold. The process of obtaining the imbalance of individual cells in the battery module includes: Based on formula Calculate the imbalance of each individual cell; in, Indicates the first i The remaining charge of each individual battery cell. This represents the minimum remaining charge in each individual battery cell; The control of each battery to be regulated to supply power to the corresponding passive balancing load using its own corresponding balancing current includes: The balancing current of the first battery to be regulated is adjusted by adjusting the resistance of the passive balancing load connected to the first battery to be regulated, where the first battery to be regulated can be any battery to be regulated.

2. The battery adaptive balancing method according to claim 1, characterized in that, The step of determining the corresponding equalization current based on the battery temperature of each battery to be adjusted includes: Determine whether the battery temperature of the first battery to be regulated in the current cycle is greater than a first temperature threshold; the first battery to be regulated can be any battery to be regulated. If the battery temperature of the first battery to be regulated is greater than the first temperature threshold in the current cycle, then the equalization current of the first battery to be regulated in the current cycle is set as the first equalization current. If the battery temperature of the first battery to be regulated in the current cycle is not greater than the first temperature threshold, then the equalization current of the first battery to be regulated in the current cycle is set as the second equalization current. The first equalizing current is less than the second equalizing current.

3. The battery adaptive balancing method according to claim 1, characterized in that, The step of determining the corresponding equalization current based on the battery temperature of each battery to be adjusted includes: The equalization current adjustment amount for the current cycle is determined based on the battery temperature change rate of the first battery to be adjusted in the current cycle; the first battery to be adjusted can be any battery to be adjusted; the battery temperature change rate is positively correlated with the equalization current adjustment amount; The equalization current of the current cycle is obtained by subtracting the equalization current adjustment amount of the current cycle from the equalization current of the previous cycle.

4. The battery adaptive balancing method according to claim 1, characterized in that, The step of determining the corresponding equalization current based on the battery temperature of each battery to be adjusted includes: The corresponding equalization current is determined based on the battery temperature of the first battery to be regulated in the current cycle, and the battery temperature of the first battery to be regulated is negatively correlated with the equalization current; the first battery to be regulated can be any battery to be regulated. If the ambient temperature of the current cycle is greater than the second preset temperature, then reduce the equalization current of the first battery to be regulated in the current cycle. If the ambient temperature of the current cycle is lower than the third preset temperature, then increase the equalization current of the first battery to be regulated in the current cycle. The third preset temperature is lower than the second preset temperature.

5. The battery adaptive balancing method according to claim 1, characterized in that, A temperature sensor is provided between at least two adjacent individual cells in the battery module. The temperature sensor is used to collect the battery temperature of the corresponding at least two adjacent individual cells. The step of determining the corresponding equalization current based on the battery temperature of each battery to be adjusted includes: The corresponding balancing current is determined based on the battery temperature of the first battery to be regulated, the temperature of the passive balancing load corresponding to the first battery to be regulated, and the degree of imbalance of the first battery to be regulated; the first battery to be regulated can be any battery to be regulated.

6. The battery adaptive balancing method according to claim 5, characterized in that, The step of determining the corresponding balancing current based on the battery temperature of the first battery to be regulated, the temperature of the passive balancing load corresponding to the first battery to be regulated, and the degree of imbalance of the first battery to be regulated includes: The combined temperature of the first battery to be regulated is obtained by weighted summing of the battery temperature and the temperature of the passive balancing load corresponding to the first battery to be regulated. The imbalance of the first battery to be adjusted is converted into a temperature compensation value; The final temperature of the first battery to be regulated is obtained by subtracting the temperature compensation value from the overall temperature, and the corresponding equalization current is determined based on the final temperature of the first battery to be regulated; the final temperature is negatively correlated with the equalization current.

7. A terminal, characterized in that, It includes a processor and a memory, the memory being used to store a computer program, and the processor being used to call and run the computer program stored in the memory to perform the battery adaptive balancing method as described in any one of claims 1 to 6.

8. A power supply device, characterized in that, Including the terminal as described in claim 7.

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