A battery performance improvement method, device, storage medium and electronic equipment
By optimizing the binding force range of the battery pack through binding force testing and the use of cushioning materials, the problems of poor battery interface contact and stress effects were solved, achieving high performance and stability of the battery during charge and discharge cycles.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2023-04-20
- Publication Date
- 2026-04-14
AI Technical Summary
During battery use, side reactions between the positive electrode, negative electrode, and electrolyte can lead to poor interface adhesion and deterioration of the contact interface, affecting battery performance. Furthermore, excessive stress can affect ion transport and internal resistance, resulting in a decline in battery performance.
By conducting binding force tests, the performance transition range of the battery pack is determined, and the initial binding force is set as the first transition point to ensure that the stress of the battery pack remains within the performance transition range during charge and discharge cycles. Buffer materials are used to reduce stress changes, and the binding force range is optimized to maintain high performance.
It effectively maintains the battery's high performance within its effective operating cycle, reduces battery performance degradation, and improves the battery's cycle performance and stability.
Smart Images
Figure CN116449243B_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of batteries, and more specifically, to a method, apparatus, storage medium, and electronic device for improving battery performance. Background Technology
[0002] With the rapid development of the new energy industry, batteries are being used more and more frequently, for example, in devices such as drones, electric vehicles, electric motorcycles, and electric bicycles. The stability of battery performance directly affects the stability of the performance of the devices they are installed in. Therefore, those skilled in the art are continuously focusing on how to improve battery performance. Summary of the Invention
[0003] The purpose of this application is to provide a method, apparatus, storage medium, and electronic device for improving battery performance, so as to at least partially improve the above-mentioned problems.
[0004] To achieve the above objectives, the technical solutions adopted in the embodiments of this application are as follows:
[0005] In a first aspect, embodiments of this application provide a method for improving battery performance, the method comprising:
[0006] The first stage of the binding force test is conducted to obtain the performance transition range of the battery pack. When the initial binding force of the battery pack belongs to the performance transition range, the cycle performance deviation of the battery pack is less than a preset deviation value.
[0007] The second stage of the binding force test is carried out, and the first turning point is determined as the initial binding force of the battery pack. The current stress of the battery pack is obtained after the first preset number of charge and discharge cycles.
[0008] The target setting range of the initial binding force of the battery pack is determined based on the first inflection point, the current stress, and the second inflection point.
[0009] Wherein, the first turning point is the minimum value in the performance turning point interval, and the second turning point is the maximum value in the performance turning point interval.
[0010] Secondly, embodiments of this application provide a battery performance improvement device, the device comprising:
[0011] The test unit is used to perform the first stage of the binding force test to obtain the performance transition range of the battery pack. When the initial binding force of the battery pack belongs to the performance transition range, the cycle performance offset of the battery pack is less than a preset offset value.
[0012] The test unit is also used to perform a second-stage binding force test, determining the first inflection point as the initial binding force of the battery pack, and obtaining the current stress of the battery pack after a first preset number of charge-discharge cycles.
[0013] The processing unit is used to determine the target setting range of the initial binding force of the battery pack based on the first inflection point, the current stress, and the second inflection point.
[0014] Wherein, the first turning point is the minimum value in the performance turning point interval, and the second turning point is the maximum value in the performance turning point interval.
[0015] Thirdly, embodiments of this application provide a storage medium storing a computer program thereon, which, when executed by a processor, implements the above-described method.
[0016] Fourthly, embodiments of this application provide an electronic device, the electronic device comprising: a processor and a memory, the memory being used to store one or more programs; when the one or more programs are executed by the processor, the above-described method is implemented.
[0017] Compared to existing technologies, the battery performance improvement method, apparatus, storage medium, and electronic device provided in this application include: performing a first-stage constraint force test to obtain the performance transition range of the battery pack, wherein when the initial constraint force of the battery pack falls within the performance transition range, the cycle performance deviation of the battery pack is less than a preset deviation value; performing a second-stage constraint force test, determining the first transition point as the initial constraint force of the battery pack, and obtaining the current stress of the battery pack after a first preset number of charge-discharge cycles; determining a target setting range for the initial constraint force of the battery pack based on the first transition point, the current stress, and the second transition point; wherein the first transition point is the minimum value in the performance transition range, and the second transition point is the maximum value in the performance transition range. This ensures that the current stress of the battery pack after the first preset number of charge-discharge cycles does not exceed the performance transition range, that is, the stress of the battery pack remains within the performance transition range throughout its effective operating cycle, thereby ensuring that the cycle performance of the battery pack remains high.
[0018] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description
[0019] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.
[0020] Figure 1 This is a schematic diagram of the structure of the electronic device provided in the embodiments of this application;
[0021] Figure 2 A schematic flowchart illustrating the battery performance improvement method provided in this application embodiment;
[0022] Figure 3 This is a schematic diagram of battery performance cycling curves provided in an embodiment of this application;
[0023] Figure 4 This is a schematic diagram of the battery stress cycle curve provided in the embodiments of this application;
[0024] Figure 5 A schematic diagram illustrating the stress variation of different systems under cycling, provided for embodiments of this application;
[0025] Figure 6 A schematic diagram illustrating the effect of the buffer material provided in this application embodiment on stress changes during cycling;
[0026] Figure 7 This is a schematic diagram of a battery performance improvement device provided in an embodiment of this application.
[0027] In the diagram: 10-Processor; 11-Memory; 12-Bus; 13-Communication Interface; 201-Test Unit; 202-Processing Unit. Detailed Implementation
[0028] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.
[0029] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.
[0030] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, in the description of this application, terms such as "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.
[0031] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.
[0032] In the description of this application, it should be noted that the terms "upper", "lower", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the product of this application is usually placed in. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.
[0033] In the description of this application, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.
[0034] The following detailed description of some embodiments of this application is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.
[0035] To prevent relative movement of the battery pack or module during use, which could lead to poor contact, the battery pack or module can be restrained by certain structural components to ensure long-term reliability. Specifically, during battery use, side reactions between the positive and negative electrodes and the electrolyte can produce gas. This gas-producing area can separate the positive and negative electrodes, resulting in poor interface adhesion and decreased battery performance. Furthermore, continuous charging and discharging can cause the electrode plates to expand, further deteriorating the contact interface and reducing battery performance. A certain degree of restraint can effectively improve interface contact and enhance product performance.
[0036] It is also important to note that as internal stress (also known as expansion force) continues to increase, excessive stress can also hinder ion transport, thereby affecting the battery's internal resistance and cycle performance. The magnitude of the stress is closely related to the magnitude of the externally applied binding force.
[0037] Therefore, it is particularly important to set reasonable binding forces in the early stages of battery assembly to ensure that the impact on the battery is minimized throughout its life cycle.
[0038] Specifically, this application provides an electronic device, which may be a computer device, a mobile phone device, or a server device, etc. Please refer to... Figure 1 A schematic diagram of the structure of an 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 via the bus 12. The processor 10 is used to execute executable modules, such as computer programs, stored in the memory 11.
[0039] Processor 10 can be an integrated circuit chip with signal processing capabilities. During implementation, each step of the battery performance improvement method can be completed through integrated logic circuits in the hardware or software instructions within processor 10. The aforementioned processor 10 can be a general-purpose processor, including a Central Processing Unit (CPU), a Network Processor (NP), etc.; it can also be a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field-Programmable Gate Array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components.
[0040] The memory 11 may include high-speed random access memory (RAM) and may also include non-volatile memory, such as at least one disk storage device.
[0041] Bus 12 can be an ISA (Industry Standard Architecture) bus, a PCI (Peripheral Component Interconnect) bus, or an EISA (Extended Industry Standard Architecture) bus, etc. Figure 1The symbol is represented by a single double-headed arrow, but this does not mean that there is only one bus 12 or one type of bus 12.
[0042] The memory 11 is used to store programs, such as programs corresponding to a battery performance improvement device. The battery performance improvement device includes at least one software functional module that can be stored in the memory 11 in the form of software or firmware, or embedded in the operating system (OS) of the electronic device. Upon receiving an execution instruction, the processor 10 executes the program to implement the battery performance improvement method.
[0043] Possibly, the electronic device provided in this application embodiment also includes a communication interface 13. The communication interface 13 is connected to the processor 10 via a bus. The electronic device can connect to a sensor or other terminal through the communication interface 13. The sensor can be, but is not limited to, a stress sensor. The stress sensor can monitor the stress (or expansion force) inside the battery pack and transmit the monitored data to the electronic device.
[0044] It should be understood that, Figure 1 The structure shown is only a partial schematic diagram of the electronic device; the electronic device may also include components that are larger than... Figure 1 The more or fewer components shown, or having the same Figure 1 The different configurations shown. Figure 1 The components shown can be implemented using hardware, software, or a combination thereof.
[0045] The battery performance improvement method provided in this application embodiment can be applied to, but is not limited to, [various applications]. Figure 1 For the specific process of the electronic devices shown, please refer to [link / reference]. Figure 2 The battery performance improvement methods include S101, S102 and S103, which are described in detail below.
[0046] S101, conduct the first stage of constraint force test to obtain the performance transition range of the battery pack.
[0047] Specifically, when the initial binding force of the battery pack falls within the performance transition range, the cycle performance offset of the battery pack is less than the preset offset value.
[0048] In one possible implementation, S101 includes S101A, S101B, and S101C, which are described in detail below.
[0049] S101A sets different initial binding forces for each of the N battery packs.
[0050] The battery packs are restrained by structural components, thereby applying a restraining force. Optionally, the initial restraining force of the N battery packs increases sequentially, that is, the initial restraining force of the (i-1)th battery pack is less than the initial restraining force of the ith battery pack, 1≤i≤N, and the 0th battery pack is a battery pack for which no initial restraining force is applied.
[0051] S101B, obtain the current cycle performance of N battery packs after a second preset number of charge-discharge cycles.
[0052] Optionally, the current cycle performance is the current capacity of the battery pack. The second preset number of cycles can be 100.
[0053] Please refer to Figure 3 , Figure 3 This is a schematic diagram of battery performance cycling curves provided in an embodiment of this application. Figure 3 As shown, the initial binding forces of the four battery packs were 100 kg, 200 kg, 400 kg, and 700 kg, respectively. The four battery packs were then subjected to room temperature cycling (charge and discharge), and the changes in capacity retention during the cycling process were observed. Figure 3 As shown, the cycling trends of the battery packs showed significant differences within 100 cycles. The cycling trends of batteries with initial binding forces of 100kg, 200kg, and 400kg were consistent, while the cycling trend of 700kg gradually deteriorated.
[0054] It should be noted that, Figure 3 The example uses four battery packs, but this is not a limitation; N can be greater than 4.
[0055] S101C compares the current cycle performance of N battery packs to determine the first and second inflection points, thereby obtaining the performance inflection range of the battery pack.
[0056] Optionally, through one or more first-stage binding force tests, it is determined that after a second preset number of charge-discharge cycles, the current cycle performance of the m-th battery pack is greater than that of the (m-1)-th battery pack, and the difference between the two is greater than a preset offset value. Therefore, the current cycle performance of the m-th battery pack is approximately equal to that of the (m+n)-th battery pack. Furthermore, if the difference between any two groups from the m-th to the (m+n)-th battery pack is less than or equal to a preset offset value, the current cycle performance of the (m+n)-th battery pack is greater than that of the (m+n+1)-th battery pack, and the difference between the two is greater than a preset offset value. In other words, the performance transition range of the battery pack can be from the initial binding force of the m-th battery pack to the initial binding force of the (m+n)-th battery pack. The performance transition range is represented as [F1, F2], where F1 is the first transition point, equal to the initial binding force of the m-th battery pack, and F2 is the second transition point, equal to the initial binding force of the (m+n)-th battery pack. The first inflection point is the minimum value in the performance inflection interval, and the second inflection point is the maximum value in the performance inflection interval.
[0057] It should be understood that starting with battery pack group 0, which has no initial binding force, the initial binding force is gradually increased. This can improve the problem of deteriorating contact interfaces and decreased battery performance, thereby improving the cycle performance of subsequent battery packs and gradually stabilizing. Simultaneously, with the increase of initial binding force, the internal stress of the battery pack also increases after multiple cycles. For details, please refer to... Figure 4 , Figure 4 This is a schematic diagram of the battery stress cycle curve provided in an embodiment of this application. Figure 4 As shown, excessive initial binding force can lead to excessive internal stress in the battery pack after multiple cycles. For example, with an initial binding force of 700 kg, the stress after 100 cycles will approach 800 kg. Therefore, excessive initial binding force can also reduce the cycle performance of the battery pack. Consequently, the current cycle performance of the (m+n)th battery pack will be greater than that of the (m+n+1)th battery pack, and the difference between the two will be greater than the preset offset value.
[0058] like Figure 3 As shown, the binding forces F1 and F2 corresponding to the inflection point of the cyclic performance satisfy F1≤100kg and 400kg≤F2≤700kg.
[0059] S102, perform the second stage of the binding force test, determine the first turning point as the initial binding force of the battery pack, and obtain the current stress of the battery pack after the first preset number of charge and discharge cycles.
[0060] Optionally, the stress changes of batteries with different binding forces during cycling are similar, ranging from 100 to 200 kg. Continuing with the previous example, the initial binding force corresponding to the first turning point F1 is 100 kg, and the stress F3 after 100 cycles is 300 kg (satisfying less than or equal to F2, where 400 kg ≤ F2 ≤ 700 kg). The first preset number of cycles can be, but is not limited to, 100 cycles.
[0061] S103, determine the target setting range of the initial binding force of the battery pack based on the first inflection point, the current stress, and the second inflection point.
[0062] To ensure that battery performance is not affected, the current stress of the battery pack after the first preset number of charge-discharge cycles will not exceed the performance transition range; that is, the current stress of the battery pack after the first preset number of charge-discharge cycles will be less than or equal to the second transition point F2. Based on this condition, the target setting range of the initial restraint force of the battery pack is determined to ensure that the stress of the battery pack remains within the performance transition range throughout the effective operating cycle, thereby ensuring that the cycle performance of the battery pack remains at a high level.
[0063] In summary, the battery performance improvement method provided in this application includes: performing a first-stage binding force test to obtain the performance transition range of the battery pack, wherein when the initial binding force of the battery pack falls within the performance transition range, the cycle performance deviation of the battery pack is less than a preset deviation value; performing a second-stage binding force test, determining the first transition point as the initial binding force of the battery pack, and obtaining the current stress of the battery pack after a first preset number of charge-discharge cycles; determining a target setting range for the initial binding force of the battery pack based on the first transition point, the current stress, and the second transition point; wherein the first transition point is the minimum value in the performance transition range, and the second transition point is the maximum value in the performance transition range. This ensures that the current stress of the battery pack after the first preset number of charge-discharge cycles does not exceed the performance transition range, that is, the stress of the battery pack within the effective working cycle remains within the performance transition range, thereby ensuring that the cycle performance of the battery pack remains high.
[0064] exist Figure 2 Based on this, for the content in S103, this application embodiment also provides a possible implementation method, please refer to the following, S103 includes: S103A, S103B and S103C, which are described in detail below.
[0065] S103A: Determine if the current stress is less than or equal to the second inflection point. If yes, proceed to S103B; otherwise, proceed to S103C.
[0066] S103B, if so, then the starting point of the target setting range is determined as the first turning point, and the ending point of the target setting range is the first turning point plus the second turning point minus the current stress value.
[0067] Specifically, the target setting range is F1 to F1+F2-F3, where F1 is the first turning point, F2 is the second turning point, and F3 is the current stress.
[0068] S103C, the endpoint of the target setting range is determined as the first turning point, and the starting point of the target setting range is the value of the first turning point minus the first preset value.
[0069] It should be understood that when the current stress is greater than the second inflection point, it is necessary to maximize the proportion of time the battery pack's stress is within the performance inflection range to partially improve the battery pack's performance. Therefore, S103C is executed to determine the endpoint of the target setting range as the first inflection point and the starting point of the target setting range as the first inflection point minus the first preset value.
[0070] The first preset value can be a pre-set value, which can be specifically generated based on the battery pack material and / or the difference between the current stress and the second inflection point.
[0071] Please refer to Figure 5 , Figure 5 This is a schematic diagram illustrating the stress variation of different systems under cycling, as provided in the embodiments of this application.
[0072] like Figure 5 As shown, prismatic batteries of different systems, ternary and lithium iron phosphate, were fabricated based on the same structural dimensions. The batteries and sensors were clamped together with a clamp, with the initial binding force controlled at approximately 270 kg, and stress changes were observed during cycling. The lithium iron phosphate system showed faster stress changes in the early stages of cycling, but the stress change decreased significantly after 100 cycles. In contrast, the ternary system showed a more gradual stress change throughout the cycling process, and under the premise of no abnormalities during cycling, the stresses of both systems eventually became similar.
[0073] Therefore, in order to further improve the performance of the battery pack, the starting point of the target setting range for the lithium iron phosphate battery pack is smaller than that for the ternary lithium battery pack. That is, under the same conditions, the first preset value for the lithium iron phosphate battery pack is greater than the first preset value for the ternary lithium battery pack.
[0074] It should be understood that because the stress change rate of lithium iron phosphate battery packs is faster, even a small change can quickly reach the performance transition range and reduce the value that exceeds the performance transition range, thereby reducing the proportion of battery pack performance degradation.
[0075] exist Figure 2 Based on this, and considering whether the current stress is greater than the second inflection point, this application embodiment also provides a possible implementation method for improving the performance of the battery pack. Please refer to the following text. The battery performance improvement method also includes: S105, which is described in detail below.
[0076] S105, adding a buffer material between batteries or between batteries and structural components, wherein the buffer material is any one of foam, spring sheet, or silicone.
[0077] It should be understood that as the battery pack undergoes charge-discharge cycles, the stress (expansion force) within the battery pack increases. If the customer has high requirements for the battery pack's cycle life, the stress F3 at the end of the cycle may exceed F2. In this case, it is necessary to mitigate the rate of stress change during battery use to reduce the final F3. Specifically, stress is continuously released during battery use to ensure that the current stress is less than the second inflection point.
[0078] In this application, cushioning material (such as cushioning foam) is attached to both sides of the battery, and the battery and sensor are clamped together using clamps (structural components). The initial binding force is controlled at 100 kg, and then a cyclic test is performed. Please refer to [reference needed]. Figure 6 , Figure 6 This is a schematic diagram illustrating the effect of the buffer material provided in this application embodiment on stress changes during cycling. (See diagram below.) Figure 6 As the cycle continues, the stress in the battery pack with the buffer material attached remains basically unchanged, satisfying F3≤F2 after 100 cycles (F3=100kg, 400kg≤F2≤700kg).
[0079] Please continue to refer to this. Figure 2 In one possible implementation, after determining the target setting range of the initial binding force of the battery pack based on the first inflection point, the current stress, and the second inflection point, the method further includes: S104, which is described in detail below.
[0080] S104, adjusts the initial binding force of the battery pack based on the target setting range.
[0081] Optionally, in this application, adjusting the initial restraint force of the battery pack can be done by an electronic device generating a prompt and being operated manually, or by an electronic device controlling a robotic arm to adjust the initial restraint force of the battery pack.
[0082] Please see Figure 7 , Figure 7 The present application provides a battery performance improvement device, which may optionally be applied to the electronic device described above.
[0083] The battery performance improvement device includes a testing unit 201 and a processing unit 202.
[0084] Test unit 201 is used to perform the first stage of restraint force test to obtain the performance transition range of the battery pack. When the initial restraint force of the battery pack is within the performance transition range, the cycle performance offset of the battery pack is less than a preset offset value.
[0085] The test unit 201 is also used to perform a second-stage binding force test, determine the first inflection point as the initial binding force of the battery pack, and obtain the current stress of the battery pack after a first preset number of charge-discharge cycles.
[0086] Processing unit 202 is used to determine the target setting range of the initial binding force of the battery pack based on the first inflection point, the current stress, and the second inflection point;
[0087] The first inflection point is the minimum value in the performance inflection interval, and the second inflection point is the maximum value in the performance inflection interval.
[0088] Optionally, the test unit 201 may execute S101 and S102 as described above, and the processing unit 202 may execute S103 to S105 as described above.
[0089] It should be noted that the battery performance improvement device provided in this embodiment can execute the method flow shown in the above method flow embodiment to achieve the corresponding technical effect. For the sake of brevity, any parts not mentioned in this embodiment can be referred to the corresponding content in the above embodiments.
[0090] This application also provides a storage medium storing computer instructions and programs, which, when read and run, execute the battery performance improvement method of the above embodiments. The storage medium may include memory, flash memory, registers, or a combination thereof.
[0091] The following provides an electronic device, which may be a computer device, a mobile phone device, or a server device, etc. This electronic device, for example... Figure 1 As shown, the battery performance improvement method described above can be implemented. 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, which, when executed by the processor 10, perform the battery performance improvement method of the above embodiment.
[0092] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.
[0093] It will be apparent to those skilled in the art that this application is not limited to the details of the exemplary embodiments described above, and that this application can be implemented in other specific forms without departing from the spirit or essential characteristics of this application. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this application is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this application. No reference numerals in the claims should be construed as limiting the scope of the claims.
Claims
1. A method for improving battery performance, characterized in that, The method includes: The first stage of the binding force test is conducted to obtain the performance transition range of the battery pack. When the initial binding force of the battery pack belongs to the performance transition range, the cycle performance deviation of the battery pack is less than a preset deviation value. The second stage of the binding force test is carried out, and the first turning point is determined as the initial binding force of the battery pack. The current stress of the battery pack is obtained after the first preset number of charge and discharge cycles. The target setting range of the initial binding force of the battery pack is determined based on the first inflection point, the current stress, and the second inflection point. Wherein, the first turning point is the minimum value in the performance turning point interval, and the second turning point is the maximum value in the performance turning point interval; The step of determining the target setting range of the initial binding force of the battery pack based on the first inflection point, the current stress, and the second inflection point includes: determining whether the current stress is less than or equal to the second inflection point; if so, determining the starting point of the target setting range as the first inflection point, and the ending point of the target setting range as the first inflection point plus the second inflection point minus the current stress.
2. The battery performance improvement method as described in claim 1, characterized in that, When the current stress is greater than the second inflection point, the method further includes: The endpoint of the target setting range is determined as the first turning point, and the starting point of the target setting range is the first turning point minus a first preset value.
3. The battery performance improvement method as described in claim 2, characterized in that, The starting point of the target setting range for the lithium iron phosphate battery pack is smaller than the starting point of the target setting range for the ternary lithium battery pack.
4. The battery performance improvement method as described in claim 1, characterized in that, When the current stress is greater than the second inflection point, the method further includes: A buffer material is added between the batteries or between the battery and the structural component, wherein the buffer material is any one of foam, spring sheet, or silicone.
5. The battery performance improvement method as described in claim 1, characterized in that, The step of conducting the first stage of the binding force test to obtain the performance transition range of the battery pack includes: Different initial binding forces were set for each of the N battery packs; Obtain the current cycle performance of the N battery packs after a second preset number of charge-discharge cycles; Based on a comparison of the current cycle performance of the N battery packs, the first inflection point and the second inflection point are determined to obtain the performance inflection range of the battery packs.
6. The battery performance improvement method as described in claim 1, characterized in that, After determining the target range for the initial restraint force of the battery pack based on the first inflection point, the current stress, and the second inflection point, the method further includes: Adjust the initial binding force of the battery pack based on the target setting range.
7. A battery performance improvement device, characterized in that, The device includes: The test unit is used to perform the first stage of the binding force test to obtain the performance transition range of the battery pack. When the initial binding force of the battery pack belongs to the performance transition range, the cycle performance offset of the battery pack is less than a preset offset value. The test unit is also used to perform a second-stage binding force test, determining the first inflection point as the initial binding force of the battery pack, and obtaining the current stress of the battery pack after a first preset number of charge-discharge cycles. The processing unit is used to determine the target setting range of the initial binding force of the battery pack based on the first inflection point, the current stress, and the second inflection point. Wherein, the first turning point is the minimum value in the performance turning point interval, and the second turning point is the maximum value in the performance turning point interval; The step of determining the target setting range of the initial binding force of the battery pack based on the first inflection point, the current stress, and the second inflection point includes: determining whether the current stress is less than or equal to the second inflection point; if so, determining the starting point of the target setting range as the first inflection point, and the ending point of the target setting range as the first inflection point plus the second inflection point minus the current stress.
8. 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 as described in any one of claims 1-6.
9. An electronic device, characterized in that, include: Processor and memory, the memory being used to store one or more programs; When the one or more programs are executed by the processor, the method as described in any one of claims 1-6 is implemented.
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