A method, apparatus, device, and medium for calculating battery equalization time.

Abstract

This disclosure provides a method, apparatus, device, and medium for calculating battery balancing time. The method includes: for multiple cells in a battery pack, obtaining the threshold time for each cell to reach a balancing threshold voltage during charging, wherein the threshold time of the first cell to reach the balancing threshold voltage is a reference time; calculating the charging amount of the cell during a first time period during charging, the first time period being the time period from the reference time to the threshold time of the cell; and determining the balancing time of the cell based on the charging amount of the cell. This method can accurately calculate the balancing time required for each cell in the battery pack to perform battery balancing.

Description

Technical Field

[0001] This disclosure relates to the field of automotive battery technology, and in particular to a method, apparatus, device, and medium for calculating battery balancing time. Background Technology

[0002] With the booming development of the new energy vehicle industry, user demand for electric vehicles is increasing, but the insufficient driving range of pure electric vehicles has always been a pain point for users. Inconsistencies in the state (such as voltage and capacity) of individual cells in the battery pack can lead to a reduction in the vehicle's driving range. Therefore, balancing strategies can be used to control the state of the cells, reduce the degree of inconsistency among the cells in the battery pack, and thus improve the vehicle's driving range.

[0003] The implementation of a balancing strategy requires accurate calculation of the balancing time for each cell in the battery pack. Currently, the industry-standard method for calculating balancing time is as follows: first, calculate the SOC (State of Charge) of each cell; then, calculate the difference between the SOC of each cell and the minimum SOC of the smallest cell; multiply this difference by the nominal capacity of each cell to obtain the capacity difference; finally, use this capacity difference to calculate the balancing time for each cell. This method has two problems: first, it relies on the accuracy of the SOC calculation for each cell. Due to technological limitations, there are errors in the SOC calculation, which will affect the accurate calculation of the balancing time; second, the nominal capacity and actual capacity of each cell are inconsistent, which will also affect the accurate calculation of the balancing time. Summary of the Invention

[0004] In view of this, embodiments of the present disclosure provide at least one method, apparatus, device, and medium for calculating battery equalization time.

[0005] Specifically, the embodiments of this disclosure are implemented through the following technical solutions:

[0006] Firstly, a method for calculating battery balancing time is provided, the method comprising:

[0007] For multiple cells in a battery pack, the threshold time for each cell to reach the equalization threshold voltage during the charging process is obtained, wherein the threshold time of the first cell to reach the equalization threshold voltage is the reference time.

[0008] Calculate the charging capacity of the battery cell during a first time period in the charging process, where the first time period is the time period from the reference time to the threshold time of the battery cell;

[0009] The equalization time of the battery cell is determined based on the charging capacity of the battery cell.

[0010] Secondly, a device for calculating battery balancing time is provided, the device comprising:

[0011] The threshold time acquisition module is used to: for multiple cells in a battery pack, acquire the threshold time when the voltage of each cell reaches the equalization threshold voltage during the charging process, wherein the threshold time of the first cell to reach the equalization threshold voltage is the reference time.

[0012] The charging capacity calculation module is used to: calculate the charging capacity of the battery cell during a first time period in the charging process, wherein the first time period is the time period from the reference time to the threshold time of the battery cell;

[0013] The balancing time determination module is used to determine the balancing time of the battery cell based on the charging capacity of the battery cell.

[0014] Thirdly, an electronic device is provided, the device including a memory and a processor, the memory being used to store computer instructions executable on the processor, and the processor being used to implement the battery balancing time calculation method according to any embodiment of the present disclosure when executing the computer instructions.

[0015] Fourthly, a computer-readable storage medium is provided having a computer program stored thereon, which, when executed by a processor, implements the method for calculating battery balancing time as described in any embodiment of this disclosure.

[0016] The technical solution of this disclosure provides a method for calculating battery balancing time. By setting a balancing threshold voltage during the charging process, the method obtains the threshold time for each cell to reach the balancing threshold voltage during charging. The threshold time when the voltage of all cells in the battery pack first reaches the balancing threshold voltage is set as a reference time. The balancing time is calculated based on the amount of charge generated by each cell from the reference time to the threshold time during charging. This method uses the relatively stable change in charge during the charging process to calculate the balancing time, avoiding the influence of SOC calculation errors and inconsistencies in the actual capacity of the cells in traditional balancing time calculations. As a result, it can more accurately calculate the balancing time required for each cell in the battery pack during battery balancing. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in one or more embodiments or related technologies of this disclosure, the accompanying drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments recorded in one or more embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a flowchart illustrating a method for calculating battery balancing time according to at least one embodiment of this disclosure;

[0019] Figure 2 This is a schematic diagram illustrating a battery cell charging process according to at least one embodiment of this disclosure;

[0020] Figure 3 This is a schematic diagram illustrating the voltage change of a battery pack at the end of the charging process, according to at least one embodiment of this disclosure;

[0021] Figure 4 This is a block diagram of a battery equalization time calculation device shown in at least one embodiment of the present disclosure;

[0022] Figure 5 This is a schematic diagram of the hardware structure of an electronic device shown in at least one embodiment of the present disclosure. Detailed Implementation

[0023] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this specification. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this specification as detailed in the appended claims.

[0024] The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of this specification. The singular forms “a,” “the,” and “the” as used in this specification and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any and all possible combinations of one or more of the associated listed items.

[0025] It should be understood that although the terms first, second, third, etc., may be used in this specification to describe various information, this information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, without departing from the scope of this specification, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Depending on the context, the word "if" as used herein may be interpreted as "when," "when," or "in response to determination."

[0026] Electric vehicles are powered by an onboard power source, typically a battery pack containing multiple cells. Ideally, each cell in the battery pack contributes equally to the power supply. However, in reality, even if the chemical composition, physical size, and shape of each cell are identical, their capacity, internal resistance, self-discharge rate, and charge / discharge efficiency may differ. Furthermore, their aging rates also vary, leading to performance differences among the individual cells. The battery pack's power supply performance suffers from the "weakest link" effect, meaning its overall performance is limited by the weakest cell. Once the weakest cell is depleted, the entire battery pack is completely exhausted. Moreover, significant differences in the condition of individual cells can affect the battery pack's lifespan and increase the risk of sparks, combustion, or even explosion.

[0027] Therefore, in order to improve the performance of the battery pack, thereby increasing the driving range of electric vehicles, and to ensure that each individual cell is not damaged during normal use to ensure the safety and stability of the battery pack, it is necessary to use battery balancing technology to balance the cells in the battery pack so that the state of each cell is kept within the expected range.

[0028] Battery balancing is generally divided into two types: active balancing and passive balancing. The battery balancing referred to in this disclosure is passive balancing, also known as energy consumption balancing. It refers to dissipating excess energy of individual cells as heat. The function of passive balancing is to make the voltage of each cell in the battery pack tend to be consistent with the voltage of the weakest cell. When the cell voltages are the same, the cell capacity can be considered to be the same.

[0029] The key to passive balancing lies in the accurate calculation of the balancing time. The more accurate the calculation of the balancing time, the better the effect of reducing the inconsistency in the state of the cells in the battery pack. Currently, the industry generally calculates the balancing time (BalTime) of each cell in the battery pack using the following method. i :

[0030] BalTime i =ΔSOC i *Cap std / BalCurent (1)

[0031] ΔSOC i =SOC i -SOC min (2)

[0032] in,

[0033] BalTime i : The equalization time of the i-th cell, i = 1…N, where N is the number of cells in the battery pack;

[0034] ΔSOCi : The difference between the SOC of the i-th cell and the minimum SOC of the cell;

[0035] SOC i : The SOC of the i-th cell;

[0036] SOC min Minimum cell SOC;

[0037] Cap std The nominal capacity of the battery cell is provided by the battery cell supplier.

[0038] BalCurent: equalizing current.

[0039] The method for calculating the equilibrium time has the following two shortcomings:

[0040] 1. This method relies on the SOC calculation accuracy of each cell. SOC is the ratio of the remaining usable capacity in a cell to the total capacity of the cell. In fact, improving the SOC calculation accuracy of cells is a world-class problem. Currently, there is no sufficiently accurate method to calculate the SOC of a cell. For example, the SOC calculation error of ternary material cells is generally above 2%, and the SOC calculation error of lithium iron phosphate material cells is generally above 5%. Therefore, the error of the input condition SOC will affect the accurate calculation of the equalization time.

[0041] 2. The actual capacity of each cell is inconsistent. The capacity of the largest cell in the battery pack may differ from that of the smallest cell by more than 3%. This method uses a uniform nominal capacity of the cells to replace the capacity of each cell. However, there is an error between the actual capacity of each cell and the nominal capacity of the cells. This will also affect the accurate calculation of the equalization time.

[0042] Based on this, the present disclosure proposes a new method for calculating battery balancing time. This method avoids the impact of SOC calculation errors and inconsistencies in the actual capacity of the cells on the accuracy of balancing time, and can more accurately calculate the balancing time of each cell in the battery pack.

[0043] like Figure 1 As shown, Figure 1 This is a flowchart illustrating a method for calculating battery balancing time according to at least one embodiment of this disclosure. The balancing time calculated by this method is used for passive balancing of any type of battery under any operating condition, and includes the following steps:

[0044] In step 102, for multiple cells in the battery pack, the threshold time for each cell to reach the equalization threshold voltage during the charging process is obtained, wherein the threshold time of the first cell to reach the equalization threshold voltage is the reference time.

[0045] In this embodiment, the charging condition is selected as the condition for calculating the battery balancing time. The charging condition refers to the state in which the battery pack is in the charging process; that is, the balancing time is calculated based on the changes in the data of each cell during the charging process. Since the current in the charging condition is more stable and easier to calculate than that in the discharging condition, the subsequent calculation of the charging capacity through current accumulation is more accurate. In one example, the charging process can be constant current charging, which makes the subsequent calculation of the charging capacity simpler and less prone to error.

[0046] Preset equalization threshold voltage V BalThd The set equalization threshold voltage is the same for each cell. The equalization threshold voltage can be set between the cell's minimum voltage and its full-charge cutoff voltage. This embodiment does not limit the value of the equalization threshold voltage; it can be set by those skilled in the art based on the actual cell type used. The minimum voltage refers to the discharge termination voltage. For example, for lithium batteries, the discharge termination voltage is typically 3.2V, and for lithium iron phosphate batteries, it is typically 2.5V. The full-charge cutoff voltage refers to the voltage of the cell when it is fully charged. For example, for lithium batteries, the full-charge cutoff voltage is typically 4.2V, and for lithium iron phosphate batteries, it is typically 3.6V to 3.65V.

[0047] In one example, the voltage difference between the fully charged cutoff voltage of the battery cell and the equalization threshold voltage is less than a preset first threshold. The preset first threshold is a relatively small value; for example, it can be set between 2% and 8% of the fully charged cutoff voltage. For instance, when the fully charged cutoff voltage is 4.3V, the preset first threshold could be 50mV. In this example, the equalization threshold voltage V... BalThd The selection of the voltage should be as close as possible to the full charge cutoff voltage. This makes it easier for the state of each cell to reach the top alignment effect after a certain charge is completed through continuous balancing. This effect can be maintained through balancing in the future. Top alignment means that the voltage of each cell is basically the same when the battery pack is fully charged. A battery pack with top alignment can further improve the driving range.

[0048] This effect occurs because although each cell has the same nominal capacity, their actual fully charged capacity differs. For example, if all cells have a nominal capacity of 3Ah, their actual capacities might be 2.8Ah, 2.9Ah, or 3Ah, resulting in inconsistent capacities among the cells when the battery pack is fully charged (which also means inconsistent voltages at full charge). It's important to note that during battery pack charging, when any cell reaches the full-charge cutoff voltage, the battery pack will stop charging. In other words, even if only one cell reaches the full-charge cutoff voltage, the battery pack is fully charged at this point, and charging ends. We want the cells in the battery pack to reach the same voltage after the battery pack is fully charged, even though their capacities are not the same (this voltage is close to the full charge cutoff voltage, but note that this voltage is not the equalization threshold voltage). This is to maximize the discharge capacity of the battery pack during discharge and improve the driving range. Therefore, by setting an equalization threshold voltage close to the full charge cutoff voltage, and calculating the equalization time based on the change in capacities after the equalization threshold voltage is exceeded, the voltage of each cell gradually aligns with the full charge cutoff voltage after each equalization process, so that the cells can reach top alignment after each charge.

[0049] In another example, the voltage difference between the fully charged cutoff voltage of the battery cell and the equalization threshold voltage is greater than a preset second threshold, wherein the preset second threshold is less than the preset first threshold.

[0050] Regarding the setting of the equalization threshold voltage, on the one hand, in order to ultimately achieve the top alignment effect, the equalization threshold voltage V... BalThd Choose a voltage as close as possible to the full-charge cutoff voltage V. Full On the other hand, the efficiency of battery balancing must also be considered: if the balancing threshold voltage is too close to the full-charge cutoff voltage, then apart from the cells that reach the balancing threshold voltage for the first time, other cells may not reach the balancing threshold voltage at all during charging, or only a few cells may reach the balancing threshold voltage. Therefore, it is impossible to calculate the balancing time of other cells, and thus impossible to balance them. This is because the cell that reaches the balancing threshold voltage for the first time is usually also the cell that reaches the full-charge cutoff voltage for the first time. When this cell reaches the full-charge cutoff voltage, it means that charging is over. If the balancing threshold voltage is too close to the full-charge cutoff voltage, the cell that reaches the balancing threshold voltage for the first time will quickly reach the full-charge cutoff voltage, at which point charging is over while other cells may not have reached the balancing threshold voltage yet.

[0051] Therefore, in order to ensure that enough cells reach the equalization threshold voltage when the battery pack is fully charged, the equalization threshold voltage cannot be too close to the full-charge cutoff voltage. Instead, the voltage difference between the equalization threshold voltage and the full-charge cutoff voltage must be greater than a preset second threshold. The preset second threshold is a value less than a preset first threshold, and this preset second threshold can be set by those skilled in the art based on the actual capacity differences between the cells. For example, this example provides a reference for setting the preset second threshold; see [link to relevant documentation]. Figure 2 As shown, the preset second threshold is designed to ensure that the charging process starts from the equalization threshold voltage V. BalThd to full charge cutoff voltage V Full The amount of charge added exceeds a certain limit, which determines the maximum balancing time calculated subsequently. In other words, the larger this limit, the more cells are charged past the balancing threshold voltage, and the longer the maximum balancing time will be. It is recommended that this limit be within the range of 2% to 5% of the battery capacity. Additionally... Figure 2 After the full charge cutoff voltage is reached, that is, after the charging is completed, the voltage of the battery cell will experience a normal drop.

[0052] This step could be during the charging process, recording the first time the voltage of all cells in the battery pack exceeds V. BalThd The time is the base time T start The cell number i is marked, and for this cell, the threshold time and the reference time are the same, i.e., the voltage is greater than V. BalThd Threshold time T i =T start Record the voltage of each subsequent cell when it is greater than V. BalThd The time is the threshold time T i And record the corresponding cell number i until the end of charging. The end of charging is the moment when any cell in the battery pack (this cell may be the first one to exceed V) is recorded. BalThd The voltage of the battery cell (or possibly other types of cells) first reaches the full-charge cutoff voltage V. Full At that moment.

[0053] Alternatively, the above data can be obtained from the charging curve after charging is complete.

[0054] In one example, the method further includes: identifying cells in the battery pack whose voltage did not reach the equalization threshold voltage at the end of the charging process as cells for which equalization time does not need to be calculated. For cells that did not reach the equalization threshold voltage, this method cannot calculate the corresponding charging time. In fact, a cell that did not reach the equalization threshold voltage means that the voltage difference between that cell and the cells that did reach the equalization threshold voltage is too large. This embodiment can equalize the cells that have reached the equalization threshold voltage, so that the voltage of the cells that have reached the equalization threshold voltage gradually approaches the voltage of the cells that have not reached the equalization threshold voltage during subsequent use, ultimately making the voltages of all cells converge.

[0055] In step 104, the charging capacity of the battery cell during a first time period during the charging process is calculated. The first time period is the time period from the reference time to the threshold time of the battery cell.

[0056] For the first cell i to reach the equilibrium threshold voltage, the first time period is 0, and the charging capacity of this cell during the first time period is AccumAh. i =0.

[0057] For other cells i that reach the equalization threshold voltage during charging, the first time period is T. start To T i During the time period, the charging capacity of each battery cell (AccumAh) i The calculation is as follows:

[0058]

[0059] Where I is the charging current of the battery.

[0060] In one example, if the charging process in the first time period is constant current charging, the calculation formula can be simplified as follows:

[0061] AccumAh i =(T i -T start )*I (4)

[0062] In step 106, the equalization time of the battery cell is determined based on the charging capacity of the battery cell.

[0063] This step can calculate the equalization time corresponding to each cell based on the amount of charge it has received when it reaches the equalization threshold voltage.

[0064] In one example, this step may involve obtaining the maximum charging capacity among the charging capacities corresponding to the multiple battery cells; for any given battery cell, calculating the balancing time of the battery cell based on the difference between the maximum charging capacity and the charging capacity of the battery cell, as well as the balancing current.

[0065] The calculation method is as follows:

[0066] BalTime i =(Max(AccumAh) i )-AccumAh i ) / BalCurrent (5)

[0067] in,

[0068] BalTime i : The equalization time of the i-th cell, i = 1…N, where N is the number of cells in the battery pack;

[0069] AccumAh i The charging capacity of each cell calculated in step 104;

[0070] BalCurent: Balancing current, which is the current used to discharge the battery cell during passive balancing. It can be set by those skilled in the art according to actual needs.

[0071] Max(AccumAh i ): The maximum charging capacity of each battery cell.

[0072] For battery cells that have reached the equalization threshold voltage during charging, the equalization time for each cell can be calculated using the method described above. For cells that have not reached the equalization threshold voltage, it is assumed that equalization is not required for the time being, and an equalization time (BalTime) is set for that cell. i =0.

[0073] For example, see Figure 3 , Figure 3 This diagram illustrates the voltage changes of a battery pack (containing 96 cells) at the end of the charging process. The equalization threshold voltage V in this diagram is... BalThd The voltage is 4260mV, and the full-charge cutoff voltage is V. Full It reached 4300mV, marking the first time it has reached V. BalThd The threshold time is the reference time T shown by the first dashed line. start The last one to reach V BalThd The threshold time is T, as shown by the second dashed line. iIn the example shown in the figure, the equalization threshold voltage is set at the position where the voltage of all cells can just reach during the charging process, so that the corresponding equalization time can be calculated for all cells.

[0074] In one embodiment, the method further includes: passively balancing the cells to be balanced in the battery pack according to the determined balancing time of the cells.

[0075] The cells whose balancing time is calculated above are the cells to be balanced. Passive balancing can be performed on these cells. The balancing time calculated above is the time required for passive balancing. Through balancing, the voltage state of all cells in the battery pack gradually approaches that of each cell. By continuously balancing during the use of the battery pack, the voltage of each cell is eventually made consistent. Passive balancing uses resistors to dissipate the energy of high-voltage or high-charge cells to reduce the difference between different cells; it is a form of energy consumption. Passive balancing can be achieved at any stage of battery pack operation, such as during charging, power supply, and when the vehicle is stationary and not using the battery.

[0076] It should be noted that the balancing time of each cell in the battery pack can be recalculated and updated every once in a while, such as once a week, so that the balancing strategy is more in line with the current state of the cells.

[0077] The battery balancing time calculation method provided in this embodiment sets a balancing threshold voltage during the charging process and obtains the threshold time for each cell to reach the balancing threshold voltage during charging. The threshold time when the voltage of all cells in the battery pack first reaches the balancing threshold voltage is set as a reference time. The balancing time is calculated based on the charging amount of each cell from the reference time to the threshold time. This method uses the relatively stable change in charge during the charging process to calculate the balancing time, avoiding the influence of SOC calculation errors and inconsistencies in the actual capacity of the cells in traditional balancing time calculations. This allows for a more accurate calculation of the balancing time required for each cell in the battery pack during battery balancing, achieving better balancing results and improving the vehicle's driving range.

[0078] The calculation method for battery balancing time in this disclosure will be explained below with specific examples.

[0079] Example

[0080] In this example, the battery pack contains 6 cells, numbered 1, 2, 3, 4, 5, and 6. Assume the equalization threshold voltage V... BalThd The voltage is 4260mV, and the full-charge cutoff voltage is V. FullThe voltage was 4300mV, the charging current was 10 amps, and charging continued until the battery pack was fully charged. During the charging process, the voltage of cell No. 3 was the first to exceed 4260mV, followed by cells No. 4, 5, and 6, which also reached 4260mV. The other cells did not reach 4260mV. The details are shown in Table 1 below:

[0081] Table 1

[0082]

[0083]

[0084] According to the calculation formula (4) in the above embodiment, we can obtain

[0085] AccumAh3=0Ah

[0086] AccumAh4=(10 / 60)*10Ah=1.67Ah

[0087] AccumAh5=(15 / 60)*10Ah=2.5Ah

[0088] AccumAh6=(20 / 60)*10Ah=3.33Ah

[0089] Assuming the balancing current is 0.05 amperes, the calculated balancing time is as follows:

[0090] BalTime3 = (3.33 - 0) / 0.05 = 66.6 hours

[0091] BalTime4 = (3.33 - 1.67) / 0.05 = 33.3 hours

[0092] BalTime5 = (3.33 - 2.5) / 0.05 = 16.6 hours

[0093] BalTime6 = (3.33 - 3.33) / 0.05 = 0 hours

[0094] Because neither battery cells 1 nor 2 reached the V... BalThd (4260mv), so the balancing time of cells 1, 2 and 6 is 0.

[0095] like Figure 4 As shown, Figure 4 This is a block diagram illustrating a battery balancing time calculation device according to at least one embodiment of the present disclosure, the device comprising:

[0096] Threshold time acquisition module 41 is used to: for multiple cells in a battery pack, acquire the threshold time when the voltage of each cell reaches the equalization threshold voltage during the charging process, wherein the threshold time of the first cell to reach the equalization threshold voltage is the reference time.

[0097] The charging power calculation module 42 is used to: calculate the charging power of the battery cell during a first time period during the charging process, wherein the first time period is the time period from the reference time to the threshold time of the battery cell;

[0098] The balancing time determination module 43 is used to determine the balancing time of the battery cell based on the charging capacity of the battery cell.

[0099] In one example, the equalization time determination module 43 is specifically used for:

[0100] Obtain the maximum charging capacity among the charging capacities corresponding to the multiple battery cells;

[0101] For any given cell, the balancing time of the cell is calculated based on the difference between the maximum charging capacity and the charging capacity of the cell, as well as the balancing current.

[0102] In one example, the equalization time determination module 43 is also used for:

[0103] Cells whose voltage did not reach the equalization threshold voltage at the end of the charging process are identified as cells for which equalization time does not need to be calculated.

[0104] In one example, the charging process is constant current charging.

[0105] In one example, the voltage difference between the fully charged cutoff voltage of the battery cell and the equalization threshold voltage is less than a preset first threshold.

[0106] In one example, the voltage difference between the fully charged cutoff voltage of the battery cell and the equalization threshold voltage is greater than a preset second threshold, wherein the preset second threshold is less than the preset first threshold.

[0107] In one example, the balancing time determination module 43 is further configured to: passively balance the cells to be balanced in the battery pack according to the determined balancing time of the cells.

[0108] The specific implementation process of the functions and roles of each module in the above device can be found in the implementation process of the corresponding steps in the above method, and will not be repeated here.

[0109] This disclosure also provides an electronic device, such as... Figure 5As shown, the electronic device includes a memory 51 and a processor 52. The memory 51 is used to store computer instructions that can be run on the processor, and the processor 52 is used to implement the battery balancing time calculation method according to any embodiment of the present disclosure when executing the computer instructions.

[0110] This disclosure also provides a computer program product, which includes a computer program / instructions that, when executed by a processor, implement the battery balancing time calculation method described in any embodiment of this disclosure.

[0111] This disclosure also provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the battery balancing time calculation method described in any embodiment of this disclosure.

[0112] For the device embodiments, since they basically correspond to the method embodiments, the relevant parts can be referred to in the description of the method embodiments. The device embodiments described above are merely illustrative. The modules described as separate components may or may not be physically separate, and the components shown as modules may or may not be physical modules, that is, they may be located in one place or distributed across multiple network modules. Some or all of the modules can be selected to achieve the purpose of the solution in this specification according to actual needs. Those skilled in the art can understand and implement this without creative effort.

[0113] The foregoing has described specific embodiments of this specification. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recited in the claims may be performed in a different order than that shown in the embodiments and may still achieve the desired result. Furthermore, the processes depicted in the drawings do not necessarily require the specific or sequential order shown to achieve the desired result. In some embodiments, multitasking and parallel processing are possible or may be advantageous.

[0114] Other embodiments of this specification will readily occur to those skilled in the art upon consideration of the specification and practice of the invention claimed herein. This specification is intended to cover any variations, uses, or adaptations that follow the general principles of this specification and include common knowledge or customary techniques in the art not claimed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this specification are indicated by the following claims.

[0115] It should be understood that this specification is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this specification is limited only by the appended claims.

[0116] The above description is merely a preferred embodiment of this specification and is not intended to limit this specification. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this specification should be included within the scope of protection of this specification.

Claims

1. A method for calculating battery balancing time, characterized in that, The method includes: For multiple cells in a battery pack, the threshold time for each cell to reach the equalization threshold voltage during the charging process is obtained, wherein the threshold time of the first cell to reach the equalization threshold voltage is the reference time, and the voltage difference between the full charge cutoff voltage of the cell and the equalization threshold voltage is less than a preset first threshold. Calculate the charging capacity of the battery cell during a first time period in the charging process, where the first time period is the time period from the reference time to the threshold time of the battery cell; The equalization time of the battery cell is determined based on the charging capacity of the battery cell; Wherein, determining the equalization time of the battery cell based on the charging capacity of the battery cell includes: Obtain the maximum charging capacity among the charging capacities corresponding to the multiple battery cells; For any given cell, the balancing time of the cell is calculated based on the difference between the maximum charging capacity and the charging capacity of the cell, as well as the balancing current.

2. The method according to claim 1, characterized in that, The method further includes: Cells whose voltage did not reach the equalization threshold voltage at the end of the charging process are identified as cells for which equalization time does not need to be calculated.

3. The method according to claim 1, characterized in that, The charging process is constant current charging.

4. The method according to claim 1, characterized in that, The voltage difference between the fully charged cutoff voltage of the battery cell and the equalization threshold voltage is greater than a preset second threshold, wherein the preset second threshold is less than the preset first threshold.

5. The method according to any one of claims 1 to 4, characterized in that, After determining the equalization time of the battery cell based on the charging capacity of the battery cell, the method further includes: Based on the determined equalization time of the battery cells, the battery cells to be equalized in the battery pack are passively equalized.

6. A device for calculating battery balancing time, characterized in that, The device includes: The threshold time acquisition module is used to: for multiple cells in a battery pack, acquire the threshold time when the voltage of each cell reaches the equalization threshold voltage during the charging process, wherein the threshold time of the first cell to reach the equalization threshold voltage is the reference time, and the voltage difference between the full charge cutoff voltage of the cell and the equalization threshold voltage is less than a preset first threshold. The charging capacity calculation module is used to: calculate the charging capacity of the battery cell during a first time period in the charging process, wherein the first time period is the time period from the reference time to the threshold time of the battery cell; The balancing time determination module is used to: obtain the maximum charging capacity among the charging capacities corresponding to the multiple battery cells; and for any one battery cell, calculate the balancing time of the battery cell based on the difference between the maximum charging capacity and the charging capacity of the battery cell, as well as the balancing current.

7. An electronic device, characterized in that, The device includes a memory and a processor, the memory being used to store computer instructions that can run on the processor, and the processor being used to implement the method of any one of claims 1 to 5 when executing the computer instructions.

8. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the program is executed by the processor, it implements the method described in any one of claims 1 to 5.

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