A battery maintenance method, device, storage medium and electronic device

Abstract

The present application provides a battery maintenance method, device, storage medium and electronic device for maintaining a battery pack. The battery pack includes at least two single cell cores, and the connection relationship between at least two single cell cores includes series connection and / or parallel connection. The method includes: when the current total voltage of the battery pack is greater than or equal to a preset first voltage threshold, obtaining the current single cell voltage of each single cell core in the battery pack; determining the current voltage difference based on the current single cell voltage; when the current voltage difference is greater than a preset voltage difference threshold, adjusting the current single cell voltage of one or more single cell cores in the battery pack so that the current voltage difference is less than or equal to the voltage difference threshold. This can improve the consistency of the single cell cores, improve the performance of the battery pack, and extend the service life of the battery pack.

Description

Technical Field

[0001] The present application relates to the field of batteries, and more specifically, to a battery maintenance method, device, storage medium and electronic device. Background Art

[0002] With the development of the new energy industry, electric bicycles are becoming more and more popular, and the number of electric two-wheelers has exceeded 300 million. With the promotion of electric two-wheeler policies, the younger consumer population, the continuous upgrading of consumption trends, and the increasing coverage of online merchants, which has led to the rapid development of offline service industries such as takeout, distribution, and express delivery, the market size of lithium battery two-wheelers is still expanding. Consumers have higher and higher requirements for the service life of electric two-wheelers, from the earliest two-year warranty to three-year warranty, and now five-year warranty, and some even propose a lifetime warranty. How to improve product performance and extend the use time within the life cycle has become a difficult problem that technicians in this field are concerned about. Summary of the invention

[0003] The purpose of the present application is to provide a battery maintenance method, device, storage medium and electronic device to at least partially improve the above-mentioned problems.

[0004] In order to achieve the above purpose, the technical solution adopted in the embodiment of the present application is as follows:

[0005] In a first aspect, an embodiment of the present application provides a battery maintenance method for maintaining a battery pack, wherein the battery pack includes at least two single cells, and the connection relationship between the at least two single cells includes a series connection and / or a parallel connection, and the method includes:

[0006] When the current total voltage of the battery pack is greater than or equal to a preset first voltage threshold, obtaining the current single cell voltage of each single cell in the battery pack;

[0007] determining a current voltage difference according to the current cell voltage;

[0008] When the current voltage difference is greater than a preset voltage difference threshold, the current single cell voltage of one or more single cells in the battery pack is adjusted so that the current voltage difference is less than or equal to the voltage difference threshold.

[0009] In a second aspect, an embodiment of the present application provides a battery maintenance device for maintaining a battery pack, wherein the battery pack includes at least two single cells, and the connection relationship between the at least two single cells includes a series connection and / or a parallel connection, and the device includes:

[0010] an information acquisition unit, for acquiring a current single cell voltage of each single cell in the battery pack when the current total voltage of the battery pack is greater than or equal to a preset first voltage threshold;

[0011] A processing unit for determining a current pressure difference based on the current single-cell voltage;

[0012] The processing unit is further configured to, when the current pressure difference is greater than a preset pressure difference threshold, adjust the current single-cell voltage of one or more single-cell battery cores in the battery pack so that the current pressure difference is less than or equal to the pressure difference threshold.

[0013] In a third aspect, an embodiment of the present application provides a storage medium on which a computer program is stored, and when the computer program is executed by a processor, the above method is implemented.

[0014] In a fourth aspect, an embodiment of the present application provides an electronic device, the electronic device includes: a processor and a memory, the memory is used to store one or more programs; when the one or more programs are executed by the processor, the above method is implemented.

[0015] Compared with the prior art, a battery maintenance method, device, storage medium and electronic device provided by an embodiment of the present application are used to maintain a battery pack, the battery pack includes at least two single-cell battery cores, and the connection relationship between at least two single-cell battery cores includes series connection and / or parallel connection. The method includes: when the current total voltage of the battery pack is greater than or equal to a preset first voltage threshold, obtaining the current single-cell voltage of each single-cell battery core in the battery pack; determining the current pressure difference based on the current single-cell voltage; when the current pressure difference is greater than a preset pressure difference threshold, adjusting the current single-cell voltage of one or more single-cell battery cores in the battery pack so that the current pressure difference is less than or equal to the pressure difference threshold. It can improve the consistency of single-cell battery cores, improve the performance of the battery pack, and extend the service life of the battery pack.

[0016] To make the above objects, features and advantages of the present application more obvious and understandable, the following specific preferred embodiments are given, and in conjunction with the accompanying drawings, the detailed description is as follows. Description of the Drawings

[0017] To more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings required in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, so they should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0018] Figure 1 It is a schematic structural diagram of the electronic device provided by the embodiment of the present application;

[0019] Figure 2 It is a schematic flowchart of the battery maintenance method provided by the embodiment of the present application;

[0020] Figure 3 It is a schematic diagram of the sub-steps of S106 provided by an embodiment of the present application;

[0021] Figure 4 It is a schematic diagram of the voltage change of a single cell during the charge and discharge process before maintenance provided by an embodiment of the present application;

[0022] Figure 5 It is a schematic diagram of the voltage change of a single cell during the charge and discharge process after maintenance provided by an embodiment of the present application;

[0023] Figure 6 It is a schematic diagram of the cycle curve of the battery pack after maintenance provided by an embodiment of the present application;

[0024] Figure 7 It is one of the schematic diagrams of the sub-steps of S106 provided by an embodiment of the present application;

[0025] Figure 8 It is one of the schematic diagrams of the sub-steps of S106 provided by an embodiment of the present application;

[0026] Figure 9 It is one of the schematic diagrams of the flow of the battery maintenance method provided by an embodiment of the present application;

[0027] Figure 10 It is a schematic diagram of the sub-steps of S201 provided by an embodiment of the present application;

[0028] Figure 11 It is a schematic diagram of the units of the battery maintenance device provided by an embodiment of the present application.

[0029] In the figure: 10 - processor; 11 - memory; 12 - bus; 13 - communication interface; 301 - information acquisition unit; 302 - processing unit. Detailed implementation manners

[0030] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. Usually, the components of the embodiments of the present application described and illustrated herein can be arranged and designed in various different configurations.

[0031] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the present application claimed, but merely represents the selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the scope of protection of the present application.

[0032] It should be noted that similar reference numerals and letters denote similar items in the following figures. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. At the same time, in the description of this application, terms such as "first", "second", etc. are only used for distinguishing descriptions and cannot be construed as indicating or implying relative importance.

[0033] It should be noted that, in this context, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variation thereof is intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising a..." does not exclude the existence of additional identical elements in the process, method, article or device comprising the said element.

[0034] In the description of this application, it should be noted that the orientation or positional relationship indicated by terms such as "upper", "lower", "inner", "outer", etc. is based on the orientation or positional relationship shown in the figures, or the orientation or positional relationship in which the product of this application is customarily placed during use. It is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation to this application.

[0035] In the description of this application, it should also be noted that unless otherwise clearly specified and defined, the terms "arranged", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0036] The following will, with reference to the figures, elaborate on some embodiments of this application. Without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0037] The battery maintenance method provided by this application is used to regularly maintain the battery pack under the premise that the operation is feasible and the cost is controllable, slow down its decay rate, so as to achieve the purpose of greatly increasing the service life.

[0038] The battery pack in the solution of this application can be, but is not limited to, installed on an electric bicycle, an electric motorcycle or a new energy vehicle, and can also be installed in other terminal devices.

[0039] An embodiment of this application provides an electronic device, which can be any one of a computer device, an in-vehicle control system, and a server device. Please refer to Figure 1 , the structural schematic diagram of the electronic device. The electronic device includes a processor 10, a memory 11, and a bus 12. The processor 10 and the memory 11 are connected through the bus 12. The processor 10 is used to execute an executable module stored in the memory 11, such as a computer program.

[0040] The processor 10 can be an integrated circuit chip with signal processing capabilities. In the implementation process, each step of the battery maintenance method can be completed through the integrated logic circuit in the hardware of the processor 10 or instructions in software form. The above-mentioned processor 10 can be a general-purpose processor, including a central processing unit (CPU for short), a network processor (NP for short), etc.; it can also be a digital signal processor (DSP for short), an application specific integrated circuit (ASIC for short), a field-programmable gate array (FPGA for short), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components.

[0041] The memory 11 may include a high-speed random access memory (RAM: Random Access Memory), and may also include a non-volatile memory, such as at least one disk memory.

[0042] The bus 12 can be an ISA (Industry Standard Architecture) bus, a PCI (Peripheral Component Interconnect) bus, an EISA (Extended Industry Standard Architecture) bus, etc. Figure 1 In, only a bidirectional arrow is used to represent it, but it does not mean that there is only one bus 12 or one type of bus 12.

[0043] The memory 11 is used to store programs, such as programs corresponding to the battery maintenance device. The battery maintenance device includes at least one software function module that can be stored in the memory 11 in the form of software or firmware or fixed in the operating system (OS) of the electronic device. After receiving the execution instruction, the processor 10 executes the program to implement the battery maintenance method.

[0044] Possibly, the electronic device provided in the embodiment of the present application further includes a communication interface 13. The communication interface 13 is connected to the processor 10 via a bus.

[0045] In a possible implementation, the battery pack includes at least two single cells and a battery management system (BMS), and the connection relationship between the at least two single cells includes series connection and / or parallel connection. For example, the number of single cells is 11, and the connection relationship is 1 parallel and 10 series, wherein two parallel single cells can be regarded as a whole, and the total number of single cells can be considered to be 10.

[0046] The electronic device can communicate with the battery manager (BMS) in the battery pack through the communication interface 13. The battery manager can collect information such as the overall voltage, current and current of the battery pack, and can also collect voltage information of each single cell, etc. The electronic device can obtain information about the battery pack and the single cell by accessing the battery manager.

[0047] It should be understood that the battery manager of the battery pack may also be provided with a communication interface.

[0048] It should be understood that Figure 1 The structure shown is only a schematic diagram of a portion of the electronic device. The electronic device may also include Figure 1 More or fewer components as shown, or with Figure 1 Different configurations are shown. Figure 1 Each component shown in the figure can be implemented by hardware, software or a combination thereof.

[0049] The battery maintenance method provided in the embodiment of the present application can be applied to but not limited to Figure 1 For detailed procedures, please refer to the electronic equipment shown in Figure 2 The battery maintenance method includes: S103, S104, S105 and S106, which are described in detail as follows.

[0050] S103 , when the current total voltage of the battery pack is greater than or equal to a preset first voltage threshold, obtaining the current single cell voltage of each single cell in the battery pack.

[0051] Optionally, the first voltage threshold can be set according to the number and material of the individual battery cells in the battery pack. For example, when the positive electrode material is lithium manganate and ternary, it is required that the average voltage of the individual battery cells is greater than 3.5V, and when the positive electrode material is lithium iron phosphate, it is required that the average voltage of the individual battery cells is greater than 3.0V. The average voltage of the individual battery cells is multiplied by the number of the individual battery cells to obtain the first voltage threshold.

[0052] It should be understood that when the current total voltage of the battery pack is less than the preset first voltage threshold, it indicates that the current individual voltage of at least one individual battery cell is too low. This individual battery cell may be in the mutation region, and it is not appropriate to evaluate its state and determine whether it needs maintenance in this state. Therefore, it is necessary to keep the current total voltage of the battery pack greater than or equal to the preset first voltage threshold.

[0053] S104, determine the current voltage difference according to the current individual voltage.

[0054] Optionally, the current voltage difference characterizes the voltage difference between the individual battery cells; the greater the current voltage difference, the worse the performance of the battery pack and the shorter the corresponding service life.

[0055] S105, determine whether the current voltage difference is greater than the preset voltage difference threshold. If so, execute S106; if not, end.

[0056] Optionally, the voltage difference threshold can be 50mv. When the current voltage difference is greater than the preset voltage difference threshold, it indicates that the current voltage difference is too large, the consistency of the individual battery cells is poor, the performance of the battery pack is poor, and the corresponding service life is short. Therefore, it is necessary to maintain it, and then execute S106.

[0057] It should be understood that when the current voltage difference is less than or equal to the voltage difference threshold, the consistency of the individual battery cells in the battery pack is relatively high, and no maintenance is required, and the process can end.

[0058] S106, in the case where the current voltage difference is greater than the preset voltage difference threshold, adjust the current individual voltage of one or more individual battery cells in the battery pack so that the current voltage difference is less than or equal to the voltage difference threshold.

[0059] It should be understood that by adjusting the current individual voltage of one or more individual battery cells in the battery pack so that the current voltage difference is less than or equal to the voltage difference threshold, the consistency of the individual battery cells can be improved, the performance of the battery pack can be improved, and the service life length of the battery pack can be increased.

[0060] In summary, a battery maintenance method provided by an embodiment of the present application is used to maintain a battery pack. The battery pack includes at least two single cells, and the connection relationship between the at least two single cells includes series connection and / or parallel connection. The method includes: when the current total voltage of the battery pack is greater than or equal to a preset first voltage threshold, obtaining the current single-cell voltage of each single cell in the battery pack; determining the current voltage difference based on the current single-cell voltage; when the current voltage difference is greater than a preset voltage difference threshold, adjusting the current single-cell voltage of one or more single cells in the battery pack so that the current voltage difference is less than or equal to the voltage difference threshold. This can improve the consistency of single cells, improve the performance of the battery pack, and extend the service life of the battery pack.

[0061] In a possible implementation, the current voltage difference is the difference between a first reference voltage and the current single-cell voltage of the first type of target single cells. The first reference voltage is the maximum value among the current single-cell voltages of each single cell, and the current single-cell voltage of the first type of target single cells is the minimum value among the current single-cell voltages of each single cell. It should be understood that in this implementation, the current voltage difference is a positive value. Please refer to Table 1 below. Table 1 includes the current single-cell voltages of 10 groups of single cells in the battery pack.

[0062] Item 1# 2# 3# 4# 5# 6# 7# 8# 9# 10# Voltage Vn / mV 3900 3994 3988 3993 3971 3989 3984 3988 3980 3986

[0063] Table 1

[0064] As shown in Table 1, the first reference voltage is 3994 mv, the first type of target single cell is the 1# single cell, and the corresponding current single-cell voltage is 3900 mv. Therefore, the current voltage difference of the battery pack shown in Table 1 is 3994 mv - 3900 mv = 94 mv. Assume that the voltage difference threshold is 50 mv. Since 94 mv is greater than 50 mv, it is necessary to optimize the consistency of the single-cell voltages in the battery pack.

[0065] On this basis, for Figure 2 the content of S106, regarding how to optimize the consistency of the single-cell voltages in the battery pack, an embodiment of the present application also provides a possible implementation. Please refer to Figure 3 , S106 includes: S106-1. After S106, the battery maintenance method further includes: S107, which is specifically described as follows.

[0066] S106-1, charge the first type of target single cells to make the current voltage difference less than or equal to the voltage difference threshold.

[0067] Please continue to refer to Table 1. The 1# single cell can be charged to increase the current single-cell voltage of the 1# single cell until the corresponding current voltage difference of the 1# single cell is less than or equal to the voltage difference threshold.

[0068] Optionally, the first type of target single cell can be charged with a preset current, for example, a current of 4A.

[0069] It should be understood that the first type of target single cell can be separately connected to an external power source to complete the charging, and the other single cells in the battery pack are in a cut-off state. The external power source can be a DC source or a regulated power source.

[0070] S107, wait for a preset first time length.

[0071] Optionally, the first time length is, for example, 5 minutes.

[0072] After waiting for the preset first time length, repeat S103 to obtain the current single cell voltage of each single cell in the battery pack until the current voltage difference is less than or equal to the voltage difference threshold.

[0073] It should be understood that Figure 3 In the process shown, the first type of target single cell corresponding to the current voltage difference may change. Continuing to refer to Table 1, the initial first type of target single cell is the 1# single cell. After charging the 1# single cell, after the second round of executing S103, the first type of target single cell may become the 5# single cell.

[0074] It should be noted that after charging the single cell, it needs to be left for a period of time to evaluate the consistency difference within the group to ensure that the difference caused by polarization is eliminated as much as possible.

[0075] Please refer to Figure 4 、 Figure 5 and Figure 6 , Figure 4 which is a schematic diagram of the voltage change of the single cell during the charge and discharge process before maintenance provided by the embodiment of the present application, Figure 5 which is a schematic diagram of the voltage change of the single cell during the charge and discharge process after maintenance provided by the embodiment of the present application, Figure 6 which is a schematic diagram of the cycle curve of the battery pack after maintenance provided by the embodiment of the present application.

[0076] As Figure 4 shown, the consistency of the single cells before maintenance is poor. After maintenance, the consistency of the single cells is significantly improved, as specifically shown in Figure 5 shown. The battery pack after maintenance is charged and discharged in cycles. It can be seen from the Figure 6 curve that there is basically no decline in the first 300 times, greatly improving the service life of the battery pack.

[0077] It should be noted that Figure 4 the test capacity of the battery pack corresponding to Figure 5 is 9.08 Ah, and the test capacity of the battery pack corresponding toFigure 4 It has increased by 44.7%.

[0078] In a possible implementation, the current pressure difference is the difference between the current single-cell voltage of the second type of target single-cell battery and the second reference voltage. The second reference voltage is the minimum value among the current single-cell voltages of each single-cell battery, and the current single-cell voltage of the second type of target single-cell battery is the maximum value among the current single-cell voltages of each single-cell battery. It should be understood that in this implementation, the current pressure difference is a positive value. Please refer to Table 2 below. Table 2 includes the current single-cell voltages of 10 groups of single-cell batteries in the battery pack.

[0079] Item 1# 2# 3# 4# 5# 6# 7# 8# 9# 10# Voltage Vn / mV 4037 4046 4038 4142 4014 4022 4011 4024 4017 4029

[0080] Table 2

[0081] As shown in Table 2, the second reference voltage is 4011 mv, the second type of target single-cell battery is the 4# single-cell battery, and the corresponding current single-cell voltage is 4142 mv. Therefore, the current pressure difference of the battery pack shown in Table 2 is 4142 mv - 4011 mv = 131 mv. Assume that the pressure difference threshold is 50 mv. Since 131 mv is greater than 50 mv, it is necessary to optimize the consistency of the single-cell voltages in the battery pack.

[0082] On this basis, for Figure 2 the content of S106 in Figure 7 , regarding how to optimize the consistency of the single-cell voltages in the battery pack, the embodiments of the present application also provide a possible implementation. Please refer to

[0083] S106-2. After S106, the battery maintenance method further includes: S107, which is specifically described as follows.

[0084] S106-2. Discharge the second type of target single-cell battery to make the current pressure difference less than or equal to the pressure difference threshold.

[0085] Optionally, the second type of target single-cell battery can be discharged according to a preset current. For example, the preset current is a current of 4 A.

[0086] It should be understood that the second type of target single-cell battery can be separately connected to a consumable load (such as a resistor) to conduct discharge, and the other single-cell batteries in the battery pack are in a cut-off state.

[0087] S107. Wait for a preset first time period.

[0088] Specifically, in Figure 3The same applies to S107 shown. After waiting for a preset first time length, the current individual voltages of each individual battery cell in the battery pack are repeatedly obtained until the current voltage difference is less than or equal to the voltage difference threshold.

[0089] The test capacity of the battery pack shown in Table 2 before maintenance was 9.28 Ah, and the test battery capacity after maintenance was 12.02 Ah, an increase of 29.5%.

[0090] It should be understood that after the consistency of the individual battery cells is improved, the service life of the battery pack is also enhanced.

[0091] In a possible implementation manner, regarding how to select Figure 3 or Figure 7 the shown manner to perform voltage adjustment and maintenance, the embodiments of the present application also provide a possible implementation manner.

[0092] Before executing S106-1 and / or S106-2, obtain the current average voltage, where the current average voltage is the average value of the current individual voltages of each individual battery cell. Count the first number of individual battery cells whose current individual voltage is higher than the current average voltage, and the second number of individual battery cells whose current individual voltage is lower than the current average voltage. When the first number is greater than the second number, select Figure 3 the shown manner, execute S106-1, and charge the first type of target individual battery cells so that the current voltage difference is less than or equal to the voltage difference threshold. When the first number is less than the second number, select Figure 7 the shown manner, execute S106-2, and discharge the second type of target individual battery cells so that the current voltage difference is less than or equal to the voltage difference threshold.

[0093] It should be understood that in Figure 3 and Figure 7 the shown manner, only the voltage of one individual battery cell is adjusted in each round, and it may take multiple rounds to complete the entire maintenance operation, which is time-consuming. To overcome this problem, the embodiments of the present application also provide a possible implementation manner. The current voltage difference is the absolute value of the difference between the current individual voltage of each individual battery cell and the current average voltage, and the current average voltage is the average value of the current individual voltages of each individual battery cell.

[0094] On this basis, for Figure 2 the content of S106, regarding how to optimize the consistency of the individual voltages in the battery pack, the embodiments of the present application also provide a possible implementation manner. Please refer to Figure 8 , S106 includes: S106-3 and S106-4, which are specifically described as follows.

[0095] S106-3, charge the third type of target single cell to make the absolute value of the difference between the third type of target single cell and the current average voltage less than the voltage difference threshold.

[0096] S106-4, discharge the fourth type of target single cell to make the absolute value of the difference between the fourth type of target single cell and the current average voltage less than the voltage difference threshold.

[0097] Among them, the third type of target single cell is a single cell whose current single cell voltage is less than the current average voltage and the corresponding current voltage difference is greater than the voltage difference threshold, and the fourth type of target single cell is a single cell whose current single cell voltage is greater than the current average voltage and the corresponding current voltage difference is greater than the voltage difference threshold.

[0098] In Figure 3 and Figure 7 In the shown manner, there is only one value of the current voltage difference in each round. In the manner shown in FIG. 8, N current voltage differences can be obtained, where N is the number of single cells. Only some of the N current voltage differences may be greater than the voltage difference threshold, or all may be greater than the voltage difference threshold, or all may be less than the voltage difference threshold. Targeted adjustments can be completed at one time to improve the maintenance efficiency.

[0099] It should be understood that during the process of charging or discharging, the outer shell of the battery pack can be opened for charging or discharging. After completion, the outer shell can be assembled and combined. Specifically, the components of the outer shell can be connected by screws or glue. It is also possible not to open the outer shell of the battery pack, and based on the battery manager in the battery pack and the controllable switch devices arranged in the battery pack, the connection relationship of the target single cell is switched to complete charging or discharging.

[0100] On the basis of Figure 2 Regarding how to obtain the voltage difference threshold, the embodiment of the present application also provides a possible implementation manner. Please refer to Figure 9 , before S105, the battery maintenance method further includes: S201, which is specifically described as follows.

[0101] S201, determine the voltage difference threshold based on the used time of the battery pack and the expected maintenance effect.

[0102] Optionally, the voltage difference threshold ΔV can be adjusted according to the used time of the battery pack (a relatively larger value can be set for a longer used time) and the expected maintenance effect to be achieved (the smaller the value, the more obvious the maintenance effect).

[0103] It should be understood that when the voltage difference threshold is set too large, it will cause inaccurate verification of the consistency of single cells. When the voltage difference threshold is set too small, it will cause an increase in the number of maintenance times, too frequent maintenance, and an increase in maintenance costs.

[0104] It should be noted that S201 can be executed at the initial stage of the maintenance method or after S104, and there is no limitation here.

[0105] Based on Figure 9 , for the content in S201, the embodiments of the present application further provide a possible implementation manner. Please refer to Figure 10 . S201 includes: S201-1, S201-2, and S201-3, which are specifically described as follows.

[0106] S201-1, determine the first estimate based on the used time of the battery pack and a preset first conversion relationship.

[0107] Wherein, the first conversion relationship is the conversion relationship between the used time and the first estimate.

[0108] S201-2, determine the second estimate based on the expected maintenance effect and a preset second conversion relationship.

[0109] Wherein, the second conversion relationship is the conversion relationship between the expected maintenance effect and the second estimate.

[0110] S201-3, perform weighted fusion on the first estimate and the second estimate according to a preset weight distribution relationship to obtain a pressure difference threshold.

[0111] Please continue to refer to Figure 9 . In a possible implementation manner, the battery maintenance method further includes: S101 and S102, which are specifically described as follows.

[0112] S101, determine whether the current total voltage of the battery pack is less than the first voltage threshold. If not, execute S103; if so, execute S102.

[0113] S102, charge the battery pack so that the current total voltage of the battery pack is greater than or equal to the first voltage threshold.

[0114] The battery maintenance method provided by the embodiments of the present application improves the endurance by regularly reducing the consistency difference of the single cells in the battery pack and increasing the discharged capacity during the use of the battery pack. The object of consistency evaluation is the voltage of the single cells in the group. It greatly improves the service life of lithium batteries for electric bicycles at a low cost, effectively reduces the failure rate of lithium batteries for electric bicycles in the market, improves the service cycle of lithium batteries for electric bicycles, and reduces the industry's recycling pressure.

[0115] Please refer to Figure 11 , Figure 11 which is a battery maintenance device provided by the embodiments of the present application. Optionally, the battery maintenance device is applied to the electronic device described above.

[0116] The battery maintenance device is used to maintain a battery pack. The battery pack includes at least two single cells, and the connection relationship between at least two single cells includes series connection and / or parallel connection. The battery maintenance device includes: an information acquisition unit 301 and a processing unit 302.

[0117] The information acquisition unit 301, when the current total voltage of the battery pack is greater than or equal to a preset first voltage threshold, acquires the current single-cell voltage of each single cell in the battery pack;

[0118] The processing unit 302 is used to determine the current voltage difference based on the current single-cell voltage;

[0119] The processing unit 302 is further used to, when the current voltage difference is greater than a preset voltage difference threshold, adjust the current single-cell voltage of one or more single cells in the battery pack so that the current voltage difference is less than or equal to the voltage difference threshold.

[0120] Optionally, the information acquisition unit 301 may execute the above S103, and the processing unit 302 may execute the above S101, S102, S104, S105, S106, S107, and S201.

[0121] It should be noted that the battery maintenance device provided in this embodiment can execute the method flow shown in the above method flow embodiment to achieve the corresponding technical effects. For the sake of brief description, for the parts not mentioned in this embodiment, reference may be made to the corresponding content in the above embodiment.

[0122] The embodiment of the present application also provides a storage medium. The storage medium stores computer instructions and programs. When the computer instructions and programs are read and run, they execute the battery maintenance method of the above embodiment. The storage medium may include a memory, a flash memory, a register, or a combination thereof, etc.

[0123] The following provides an electronic device, which can be any one of a computer device, an in-vehicle control system, and a server device. The electronic device is as Figure 1 shown and can implement the above battery maintenance method; specifically, the electronic device includes: a processor 10, a memory 11, and a bus 12. The processor 10 may be a CPU. The memory 11 is used to store one or more programs. When one or more programs are executed by the processor 10, the battery maintenance method of the above embodiment is executed.

[0124] In the embodiments provided in this application, it should be understood that the disclosed devices and methods can also be implemented in other ways. The device embodiments described above are merely illustrative. For example, the flowcharts and block diagrams in the accompanying drawings show the possible architectures, functions, and operations of devices, methods, and computer program products according to multiple embodiments of this application. In this regard, each block in the flowchart or block diagram may represent a module, a program segment, or a part of code, and the module, program segment, or part of code contains one or more executable instructions for implementing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the blocks may occur in a different order than marked in the accompanying drawings. For example, two consecutive blocks can actually be executed substantially in parallel, and they can sometimes be executed in the reverse order, depending on the functions involved. It should also be noted that each block in the block diagram and / or flowchart, as well as the combination of blocks in the block diagram and / or flowchart, can be implemented by a dedicated hardware-based system for performing the specified functions or actions, or can be implemented by a combination of dedicated hardware and computer instructions.

[0125] In addition, in each embodiment of this application, the various functional modules can be integrated together to form an independent part, or each module can exist separately, or two or more modules can be integrated to form an independent part.

[0126] If the above functions are implemented in the form of software function modules and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a part of this technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in each embodiment of this application. The aforementioned storage medium includes: various media such as USB flash drives, mobile hard disks, read-only memories (ROM, Read-Only Memory), random access memories (RAM, Random Access Memory), magnetic disks, or optical discs that can store program codes.

[0127] The above is only the preferred embodiment of this application and is not used to limit this application. For those skilled in the art, this application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of this application shall be included in the protection scope of this application.

[0128] It is obvious to those skilled in the art that the present application is not limited to the details of the above-mentioned exemplary embodiments, and the present application can be implemented in other specific forms without departing from the spirit or basic characteristics of the present application. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present application is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be encompassed within the present application. Any reference signs in the claims should not be construed as limiting the claimed rights.

Claims

1. A battery maintenance method, characterized in that, For maintaining a battery pack, the battery pack includes at least two single cells, and the connection relationship between the at least two single cells includes series connection and / or parallel connection. The method includes: When the current total voltage of the battery pack is greater than or equal to a preset first voltage threshold, obtaining the current single-cell voltage of each single cell in the battery pack; Determining a current voltage difference based on the current single-cell voltage; Based on the used time of the battery pack and a preset first conversion relationship, determining a first estimation value, where the first conversion relationship is the conversion relationship between the used time and the first estimation value; based on the expected maintenance effect and a preset second conversion relationship, determining a second estimation value, where the second conversion relationship is the conversion relationship between the expected maintenance effect and the second estimation value; performing weighted fusion on the first estimation value and the second estimation value according to a preset weight distribution relationship to obtain a voltage difference threshold; When the current voltage difference is greater than the preset voltage difference threshold, adjusting the current single-cell voltage of one or more single cells in the battery pack so that the current voltage difference is less than or equal to the voltage difference threshold.

2. The battery maintenance method according to claim 1, characterized in that, The current voltage difference is the difference between a first reference voltage and the current single-cell voltage of a first type of target single cell. The first reference voltage is the maximum value among the current single-cell voltages of all single cells, and the current single-cell voltage of the first type of target single cell is the minimum value among the current single-cell voltages of all single cells. The step of adjusting the current single-cell voltage of one or more single cells in the battery pack includes: Charging the first type of target single cell so that the current voltage difference is less than or equal to the voltage difference threshold; After charging the first type of target single cell, the method further includes: After waiting for a preset first time length, repeatedly obtaining the current single-cell voltage of each single cell in the battery pack until the current voltage difference is less than or equal to the voltage difference threshold.

3. The battery maintenance method according to claim 1, wherein, The current voltage difference is the difference between the current single-cell voltage of a second type of target single cell and a second reference voltage. The second reference voltage is the minimum value among the current single-cell voltages of all single cells, and the current single-cell voltage of the second type of target single cell is the maximum value among the current single-cell voltages of all single cells. The step of adjusting the current single-cell voltage of one or more single cells in the battery pack includes: Discharging the second type of target single cell so that the current voltage difference is less than or equal to the voltage difference threshold; After discharging the second type of target single cell, the method further includes: After waiting for a preset first time length, repeatedly obtaining the current single-cell voltage of each single cell in the battery pack until the current voltage difference is less than or equal to the voltage difference threshold.

4. The battery maintenance method according to claim 1, characterized in that, The current voltage difference is the absolute value of the difference between the current single-cell voltage of each single cell and the current average voltage, and the current average voltage is the average value of the current single-cell voltages of all single cells. The step of adjusting the current single-cell voltage of one or more single cells in the battery pack includes: Charge the third type of target single cell to make the absolute value of the difference between the third type of target single cell and the current average voltage less than the voltage difference threshold; Discharge the fourth type of target single cell to make the absolute value of the difference between the fourth type of target single cell and the current average voltage less than the voltage difference threshold; Among them, the third type of target single cell is a single cell whose current single cell voltage is less than the current average voltage and the corresponding current voltage difference is greater than the voltage difference threshold, and the fourth type of target single cell is a single cell whose current single cell voltage is greater than the current average voltage and the corresponding current voltage difference is greater than the voltage difference threshold.

5. The battery maintenance method according to claim 1, characterized in that, When the current total voltage of the battery pack is less than a preset first voltage threshold, the method further includes: Charge the battery pack to make the current total voltage of the battery pack greater than or equal to the first voltage threshold.

6. A battery maintenance device, characterized in that, For maintaining a battery pack, the battery pack includes at least two single cells, and the connection relationship between the at least two single cells includes series connection and / or parallel connection. The device includes: An information acquisition unit, when the current total voltage of the battery pack is greater than or equal to a preset first voltage threshold, acquires the current single cell voltage of each single cell in the battery pack; A processing unit for determining a current voltage difference based on the current single cell voltage; The processing unit is further configured to determine a first estimate based on the used time of the battery pack and a preset first conversion relationship, where the first conversion relationship is the conversion relationship between the used time and the first estimate; determine a second estimate based on the expected maintenance effect and a preset second conversion relationship, where the second conversion relationship is the conversion relationship between the expected maintenance effect and the second estimate; perform weight fusion on the first estimate and the second estimate according to a preset weight distribution relationship to obtain a voltage difference threshold; The processing unit is further configured to, when the current voltage difference is greater than a preset voltage difference threshold, adjust the current single cell voltage of one or more single cells in the battery pack to make the current voltage difference less than or equal to the voltage difference threshold.

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

8. An electronic device, characterized in that, Including: A processor and a memory, the memory is used to store one or more programs; When the one or more programs are executed by the processor, the method according to any one of claims 1-5 is implemented.

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