Method and device for determining width of reserved gap of single battery

Abstract

The invention discloses a method and device for determining the width of a reserved gap of a single battery, and relates to the technical field of power batteries, and the method comprises the steps: determining a single fastening force range corresponding to each gap width based on the service life test results of the single battery under different gap widths; selecting a to-be-measured gap width from the gap widths, and determining a first grouping fastening force range based on key dimension parameters of battery modules obtained by grouping the battery monomers under the to-be-measured gap width; when the first group fastening force range accords with the monomer fastening force range of the to-be-tested gap width, obtaining a second group fastening force range of the battery module determined in the cyclic charging and discharging test; and when the second grouping fastening force range accords with the monomer fastening force range of the to-be-measured gap width, taking the to-be-measured gap width as a target reserved gap width when the battery monomers are grouped. Through the mode, the stress of the grouped single batteries can be ensured to be within a reasonable range, the accuracy of gap design is improved, and the service life of the batteries is prolonged.

Description

Technical Field

[0001] This application relates to the field of power battery technology, and in particular to a method and apparatus for determining the reserved gap width of a battery cell. Background Technology

[0002] During cyclic charging and discharging, battery cells expand, causing changes in the stress on them. Excessive or insufficient stress on the cells can affect battery life. Therefore, expansion gaps need to be provided during battery integration to control the stress on the cells within a reasonable range and ensure lifespan. Currently, the conventional approach to designing cell gaps involves conducting lifespan tests on individual cells with different gaps to determine an ideal gap value, which is then used during battery integration. However, since batteries are typically assembled from multiple cells, requiring components such as heat insulation pads, end plates, and crossbeams for fixation, the strength and elastic modulus of each cell and component are inconsistent with the conditions tested on individual cells. If the gap value for the group of cells is directly set according to the ideal gap value tested on individual cells, the stress on the cells can easily exceed a reasonable range, leading to a reduction in battery life.

[0003] The above content is only used to help understand the technical solution of the present invention and does not represent an admission that the above content is prior art. Summary of the Invention

[0004] The main purpose of this application is to provide a method and apparatus for determining the reserved gap width of a single battery cell, which aims to solve the technical problem that the existing technology of directly using the ideal gap value of a single cell test as the gap value of a group of cells is not accurate enough and affects the battery life.

[0005] To achieve the above objectives, this application provides a method for determining the width of the reserved gap between battery cells, the method comprising: Based on the life test results of battery cells at different gap widths, the range of cell fastening force corresponding to each gap width is determined. Select the gap width to be measured from the gap widths, and determine the first grouping fastening force range based on the key size parameters of the battery module obtained by grouping the battery cells under the gap width to be measured. When the first grouping clamping force range matches the single-unit clamping force range of the gap width to be tested, the second grouping clamping force range of the battery module determined in the cyclic charge-discharge test is obtained. When the second grouping clamping force range meets the single-cell clamping force range of the gap width to be measured, the gap width to be measured is taken as the target reserved gap width when the battery cells are grouped together.

[0006] In one embodiment, the life test results include at least a first correlation curve between the upper limit of the fastening force and the battery life, and a second correlation curve between the lower limit of the fastening force and the battery life. The step of determining the cell fastening force range corresponding to each gap width based on the life test results of battery cells at different gap widths includes: Based on the target battery life and the first corresponding relationship curve of multiple battery cells under different gap widths, the upper limit of the fastening force of the multiple battery cells under different gap widths is determined respectively. Based on the upper limit of the clamping force of the multiple battery cells under different gap widths, the upper limit of the clamping force of each cell at each gap width is determined; Based on the target battery life and the second corresponding relationship curve of the plurality of battery cells under different gap widths, the lower limit of the fastening force of the plurality of battery cells under different gap widths is determined respectively. Based on the lower limit of the clamping force of the multiple battery cells at different gap widths, the lower limit of the clamping force of each cell at each gap width is determined. Based on the upper limit and lower limit of the individual unit fastening force for each gap width, the range of individual unit fastening force for each gap width is determined.

[0007] In one embodiment, the step of determining the first grouping clamping force range based on the key dimensional parameters of the battery module obtained by grouping the individual battery cells together under the width of the gap to be measured includes: Based on the key dimension parameters of the battery module obtained by grouping the individual battery cells under the width of the gap to be measured, the maximum and minimum deformation amounts are determined. Obtain the module elasticity coefficient and the first correspondence between the module elasticity coefficient, the maximum deformation, and the upper limit of the first group fastening force; Based on the module elastic coefficient, the maximum deformation, and the first correspondence, the upper limit of the first group fastening force is obtained; Obtain the second correspondence between the module's elastic coefficient, minimum deformation, and the lower limit of the first grouping fastening force; Based on the module elastic coefficient, the minimum deformation, and the second correspondence, the lower limit of the first group fastening force is obtained; The first group fastening force range is obtained based on the upper limit of the first group fastening force and the lower limit of the first group fastening force.

[0008] In one embodiment, the key dimensional parameters include at least the upper deviation dimension of the module, the lower deviation dimension of the module, the upper deviation dimension of the mounting beam, and the lower deviation dimension of the mounting beam; The step of determining the maximum and minimum deformation based on the key dimensional parameters of the battery module obtained by grouping the individual battery cells together under the measured gap width includes: The maximum deformation is determined based on the upper deviation dimension of the battery module and the lower deviation dimension of the mounting beam. The minimum deformation is determined based on the lower deviation dimension of the battery module and the upper deviation dimension of the mounting beam.

[0009] In one embodiment, the method further includes: Obtain the third correspondence between the elastic coefficient of a single battery cell, the number of single battery cells, the elastic coefficient of a key assembly component, the number of key assembly components, and the elastic coefficient of the module. Obtain the elastic coefficient of a single battery cell, the number of single battery cells, the elastic coefficient of key assembly components, and the number of key assembly components; The module elastic coefficient is determined based on the elastic coefficient of the individual battery cell, the number of individual battery cells, the elastic coefficient of the key assembly component, the number of key assembly components, and the third correspondence.

[0010] In one embodiment, the method further includes: If the first group of fastening force range does not conform to the individual fastening force range of the gap width to be measured, or if the second group of fastening force range does not conform to the individual fastening force range of the gap width to be measured, a new gap width to be measured shall be selected from the gap widths. Based on the reselected gap width to be measured, return to the step of determining the first grouping clamping force range by analyzing the key dimension parameters of the battery module obtained by grouping the battery cells together under the gap width to be measured.

[0011] In one embodiment, the step of reselecting the gap width to be measured from the gap widths includes: When the upper limit of the first group fastening force range is greater than the upper limit of the single unit fastening force range, the gap width to be measured is reselected from the gap widths based on the width reduction adjustment strategy. When the lower limit of the first group fastening force range is less than the lower limit of the individual fastening force range, the gap width to be measured is reselected from the gap widths based on the width increase adjustment strategy.

[0012] In one embodiment, the step of reselecting the gap width to be measured from the gap widths includes: When the upper limit of the second group fastening force range is greater than the upper limit of the single unit fastening force range, the gap width to be measured is reselected from the gap widths based on the width reduction adjustment strategy. When the lower limit of the second group fastening force range is less than the lower limit of the single-unit fastening force range, the gap width to be measured is reselected from the gap widths based on the width increase adjustment strategy.

[0013] In one embodiment, the step of using the measured gap width as the target reserved gap width when assembling the battery cells further includes: Acquire thermal runaway test data and thermal runaway temperature threshold of the battery cell under the width of the gap to be tested; Based on the thermal runaway test data, the temperatures of adjacent cells during the thermal runaway of the battery cell are determined; When the temperature of the adjacent cells is less than or equal to the thermal runaway temperature threshold, the step of using the width of the gap to be measured as the target reserved gap width when the battery cells are grouped together is performed.

[0014] In addition, to achieve the above objectives, this application also proposes a battery module, which includes a preset number of battery cells, and the gap width between the battery cells is obtained by the steps of the battery cell reserved gap width determination method described above.

[0015] In addition, to achieve the above objectives, this application also proposes a battery pack, which includes the battery module as described above.

[0016] Furthermore, to achieve the above objectives, this application also proposes a device for determining the reserved gap width of a battery cell, the device comprising: The single cell measurement module is used to determine the range of single cell fastening force corresponding to each gap width based on the life test results of the single cell at different gap widths. The group verification module is used to select the gap width to be tested from the gap widths, and determine the first grouping fastening force range based on the key size parameters of the battery module obtained by grouping the battery cells under the gap width to be tested. The group verification module is also used to obtain the second group clamping force range of the battery module determined in the cyclic charge-discharge test when the first group clamping force range conforms to the single-cell clamping force range of the gap width to be tested. The grouping verification module is also used to take the gap width to be tested as the target reserved gap width when the second grouping clamping force range meets the single-cell clamping force range of the gap width to be tested.

[0017] In addition, to achieve the above objectives, this application also proposes a device for determining the reserved gap width of a battery cell. The device includes a memory, a processor, and a computer program stored in the memory and executable on the processor. The computer program is configured to implement the steps of the battery cell reserved gap width determination method described above.

[0018] In addition, to achieve the above objectives, the present invention also proposes a storage medium, which is a computer-readable storage medium, and stores a computer program on the storage medium. When the computer program is executed by a processor, it implements the steps of the method for determining the reserved gap width of the battery cell as described above.

[0019] In addition, to achieve the above objectives, this application also provides a computer program product, which includes a computer program that, when executed by a processor, implements the steps of the method for determining the reserved gap width of a battery cell as described above.

[0020] This application provides a method for determining the reserved gap width of battery cells. Based on the life test results of battery cells at different gap widths, the method determines the cell clamping force range corresponding to each gap width. A test gap width is selected from the gap widths. Based on the key dimensional parameters of the battery module obtained by assembling battery cells at the test gap width, a first grouping clamping force range is determined. When the first grouping clamping force range meets the cell clamping force range of the test gap width, a second grouping clamping force range of the battery module determined in the cyclic charge-discharge test is obtained. When the second grouping clamping force range meets the cell clamping force range of the test gap width, the test gap width is used as the target reserved gap width when assembling battery cells. This application verifies the upper and lower limits of the clamping force after battery cell assembly, ensuring that the force on battery cells after assembly based on the target gap is within a reasonable range. This improves the accuracy of gap design, extends battery life, and enhances vehicle safety. It solves the technical problem that traditional solutions, which directly use the ideal gap value tested for individual cells as the gap value for assembled cells, are not accurate enough and affect battery life. Attached Figure Description

[0021] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0022] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 A flowchart illustrating an embodiment of the method for determining the reserved gap width of a single battery cell in this application; Figure 2 A schematic diagram of the life test for the method of determining the reserved gap width of a battery cell provided in Embodiment 1 of this application; Figure 3A flowchart illustrating Embodiment 2 of the method for determining the reserved gap width of a single battery cell in this application; Figure 4 This is a schematic diagram of the key assembly components of the method for determining the reserved gap width of a single battery cell provided in Embodiment 2 of this application; Figure 5 A flowchart illustrating Embodiment 3 of the method for determining the reserved gap width of a single battery cell in this application; Figure 6 This is a schematic diagram of the module structure of the battery cell reserved gap width determination device in an embodiment of this application; Figure 7 This is a schematic diagram of the equipment structure of the hardware operating environment involved in the method for determining the reserved gap width of a battery cell in the embodiments of this application.

[0024] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0025] It should be understood that the specific embodiments described herein are merely illustrative of the technical solutions of this application and are not intended to limit this application.

[0026] To better understand the technical solution of this application, a detailed description will be provided below in conjunction with the accompanying drawings and specific implementation methods.

[0027] The main solution of this application embodiment is as follows: Based on the life test results of battery cells at different gap widths, determine the cell clamping force range corresponding to each gap width; select the gap width to be tested from the gap widths, and determine the first grouping clamping force range based on the key size parameters of the battery module obtained by grouping battery cells at the gap width to be tested; when the first grouping clamping force range meets the cell clamping force range of the gap width to be tested, obtain the second grouping clamping force range of the battery module determined in the cycle charge-discharge test; when the second grouping clamping force range meets the cell clamping force range of the gap width to be tested, use the gap width to be tested as the target reserved gap width when grouping battery cells.

[0028] Currently, battery cells expand during cyclic charging and discharging, causing changes in the stress on the cells. Excessive or insufficient stress on the cells will affect their lifespan. Therefore, expansion gaps need to be provided for the cells during battery integration to control the stress within a reasonable range and ensure lifespan. The conventional approach to designing cell gaps involves conducting lifespan tests on individual cells with different gaps to determine an ideal gap value, which is then used during battery integration. However, since batteries are typically assembled from multiple cells, requiring components such as heat insulation pads, end plates, and crossbeams for fixation, the strength and elastic modulus of each cell and component are inconsistent with the conditions tested on individual cells. If the gap value for the group of cells is directly set according to the ideal gap value tested on individual cells, the stress on the cells can easily exceed a reasonable range, leading to a reduction in battery life.

[0029] In addition, excessive force on the battery cell may damage the battery cell casing and fixing components, while insufficient force on the battery cell may cause the battery cell to shift under vehicle vibration / impact, and friction may cause poor insulation, affecting vehicle safety.

[0030] This application provides a solution to verify the upper and lower limits of the clamping force after battery cells are assembled into a group, ensuring that the force on the battery cells after being assembled based on the target gap is within a reasonable range. This can improve the accuracy of gap design, extend battery life, and improve vehicle safety. It solves the technical problem that the traditional solution of directly using the ideal gap value of a single cell test as the gap value of the assembled cells is not accurate enough and affects battery life.

[0031] It should be noted that the executing entity in this embodiment can be a computing service device with data processing, network communication, and program execution functions, such as a tablet computer, personal computer, or mobile phone, or an electronic device capable of performing the above functions, a battery cell reserved gap width determination device, etc. This embodiment does not specifically limit it. The following uses the battery cell reserved gap width determination device as an example to describe this embodiment and the following embodiments.

[0032] This application provides a method for determining the width of the reserved gap in a single battery cell, referring to... Figure 1 , Figure 1 This is a flowchart illustrating the first embodiment of the method for determining the reserved gap width of a battery cell in this application.

[0033] In this embodiment, the method for determining the reserved gap width of a single battery cell includes steps S10 to S40: Step S10: Based on the life test results of battery cells at different gap widths, determine the range of cell clamping force corresponding to each gap width. It should be noted that during cyclic charging and discharging, battery cells expand, causing changes in the forces acting on them (i.e., changes in clamping / restraining forces). Therefore, during battery integration, a corresponding expansion gap needs to be reserved for each battery cell to control the forces acting on it. The width of this reserved expansion gap is called the reserved gap width. In this embodiment, the gap width is a pre-set, potentially usable reserved gap width. A reasonable range of values ​​can be set based on experience / actual needs, and a value step size can be defined. Multiple values ​​within this range can then be determined as gap widths for testing. Finally, the most suitable / accurate width can be found among these gap widths as the final reserved gap width, i.e., the target reserved gap width.

[0034] Additionally, it should be noted that the type of battery cell can be determined according to actual needs. Different types of battery cells usually require independent determination / design of the reserved gap width to ensure accuracy.

[0035] It is understandable that life tests are conducted on individual battery cells at different gap widths, and the results obtained are the life test results. In this embodiment, the life test results include at least a first correlation curve between the upper limit of the clamping force and the battery life, and a second correlation curve between the lower limit of the clamping force and the battery life. The upper limit of the clamping force is the maximum clamping force, and the first correlation curve between the upper limit of the clamping force and the battery life is the curve showing how the battery life changes with the upper limit of the clamping force. The lower limit of the clamping force is the minimum clamping force, and the second correlation curve between the lower limit of the clamping force and the battery life is the curve showing how the battery life changes with the lower limit of the clamping force.

[0036] It should be understood that, reference Figure 2 When conducting life tests on individual battery cells, a clamping plate can be installed on the outside of the battery cell, and a buffer pad is used to achieve the corresponding gap width between the clamping plate and the battery cell.

[0037] In one feasible implementation, step S10 may include steps S101 to S105: Step S101: Based on the target battery life and the first correspondence curve of multiple battery cells under different gap widths, determine the upper limit of the fastening force of the multiple battery cells under different gap widths respectively. It should be noted that the target lifespan is the pre-set battery lifespan that needs to be achieved, for example: 1200 cycles.

[0038] Understandably, based on the target battery life, the upper limit of the corresponding fastening force is determined on the first corresponding relationship curve, thereby obtaining the upper limit of the fastening force under different gap widths.

[0039] Step S102: Based on the upper limit of the clamping force of the multiple battery cells under different gap widths, determine the upper limit of the individual cell clamping force for each gap width. It should be understood that in practical implementation, multiple battery cells are usually used to conduct life tests separately. At this time, the upper limit of the clamping force of multiple battery cells under different gap widths can be obtained. The minimum value of the upper limit of the clamping force of multiple battery cells under the same gap width is found and taken as the upper limit of the individual cell clamping force for that gap width, that is, the maximum value of the clamping force of the battery cell when not assembled.

[0040] Step S103: Based on the target battery life and the second corresponding relationship curve of the plurality of battery cells under different gap widths, determine the lower limit of the fastening force of the plurality of battery cells under different gap widths respectively. Understandably, based on the target battery life, the corresponding lower limit of the fastening force is determined on the second corresponding curve, thereby obtaining the lower limit of the fastening force for different gap widths.

[0041] Step S104: Based on the lower limit of the clamping force of the multiple battery cells under different gap widths, determine the lower limit of the individual cell clamping force for each gap width. It should be understood that in practical implementation, multiple battery cells are usually used to conduct life tests separately. At this time, the lower limit of the clamping force of multiple battery cells under different gap widths can be obtained. The maximum value of the lower limit of the clamping force of multiple battery cells under the same gap width is found and used as the lower limit of the individual cell clamping force for that gap width, that is, the minimum clamping force of the battery cell when not assembled.

[0042] Step S105: Determine the range of individual fastening forces for each gap width based on the upper limit and lower limit of the individual fastening force for each gap width.

[0043] It should be noted that the single-cell fastening force range refers to the fastening force range of individual battery cells before assembly, and can be used as a benchmark for subsequent fastening force verification. Generally speaking, the single-cell fastening force range is determined by the upper limit and lower limit of the single-cell fastening force. The upper limit of the single-cell fastening force range is the upper limit of the single-cell fastening force, and the lower limit of the single-cell fastening force range is the lower limit of the single-cell fastening force.

[0044] It is understandable that the range of individual unit fastening forces for each gap width is generated based on the upper and lower limits of the individual unit fastening force for each gap width. For example, assume that the upper limit of the individual unit fastening force for gap width A is... The lower limit of the single-unit fastening force is Then the range of the single-unit fastening force corresponding to the gap width A is: .

[0045] Step S20: Select the gap width to be measured from the gap widths, and determine the first grouping fastening force range based on the key size parameters of the battery module obtained by grouping the battery cells under the gap width to be measured. It should be noted that the gap width to be tested is the gap width currently being tested / evaluated. It can be selected from all gap widths. For example, a gap width can be randomly selected as the gap width to be tested, or the median value can be selected as the gap width to be tested, or the minimum / maximum value can be selected as the gap width to be tested. This embodiment does not make specific limitations on this.

[0046] It is understandable that multiple battery cells can be grouped together according to the gap width to be measured to form a battery module. The key dimensional parameters are the dimensional data related to the calculation of the fastening force, which usually involve the dimensions of the battery module itself and the dimensions of the mounting beam of the box after the battery module is put into the box.

[0047] Additionally, it should be noted that the first grouping clamping force range refers to the clamping force range of the battery cells after assembly, determined based on key dimensional parameters. The upper limit of the first grouping clamping force range is the upper limit of the first grouping clamping force, and the lower limit is the lower limit of the first grouping clamping force. The first grouping clamping force range corresponding to the gap width to be tested needs to be verified to determine whether the gap width to be tested ensures that the clamping force of the assembled battery cells is within the individual cell clamping force range.

[0048] It should be understood that, in practical implementation, the upper limit of the first grouping clamping force is calculated based on the key dimensional parameters of the battery module. and the lower limit of the first group fastening force This allows for adjustments based on the upper limit of the first group's fastening force. and the lower limit of the first group fastening force The first group of fastening force range is obtained. .

[0049] Step S30: When the first group fastening force range meets the single-cell fastening force range of the gap width to be tested, obtain the second group fastening force range of the battery module determined in the cyclic charge-discharge test. It should be noted that the tightening force range of the first group is consistent with the individual tightening force range of the gap width to be measured. That is, the upper limit of the tightening force of the first group (the upper limit of the tightening force range of the first group) is less than or equal to the upper limit of the individual tightening force of the gap width to be measured (the upper limit of the individual tightening force range of the individual), and the lower limit of the tightening force of the first group (the lower limit of the tightening force range of the first group) is greater than or equal to the lower limit of the individual tightening force of the gap width to be measured (the lower limit of the individual tightening force range of the individual).

[0050] Understandably, if the clamping force range of the first grouping matches the clamping force range of the individual cells with the gap width to be tested, it indicates that the clamping force range of the assembled battery cells determined based on the key dimensional parameters is reasonable. The next step is to further verify the clamping force range of the second grouping. The second grouping clamping force range is the clamping force range of the assembled battery cells determined based on cyclic charge-discharge tests. The upper limit of the second grouping clamping force range is the upper limit of the second grouping clamping force, and the lower limit of the second grouping clamping force range is the lower limit of the second grouping clamping force.

[0051] It should be understood that the number of cyclic charge-discharge tests / simulations performed on the battery modules formed by grouping individual battery cells according to the test gap width can be up to 1200 cycles; this embodiment does not specifically limit this. During the cyclic charge-discharge test, the maximum value of the initial clamping force is set as the upper limit of the first grouping clamping force. The minimum initial fastening force is set as the lower limit of the first group fastening force. The maximum tightening force at the end of the service life is determined as the upper limit of the second group tightening force. The minimum fastening force at the end of the service life is determined to be the lower limit of the second group fastening force. After obtaining the upper limit of the second group fastening force. Second group of lower fastening force limit Then, the upper limit of the second group fastening force can be determined. Second group of lower fastening force limit Determine the range of tightening force for the second group. .

[0052] Furthermore, in one feasible implementation, when the first grouping clamping force range does not conform to the single-cell clamping force range of the gap to be tested, a new gap width to be tested is selected from the gap widths; based on the newly selected gap width to be tested, the step of determining the first grouping clamping force range is returned to the execution based on the key size parameters of the battery module obtained by grouping the battery cells under the gap width to be tested.

[0053] It should be noted that if the first group of clamping force range does not conform to the individual clamping force range of the gap to be tested, it indicates that the clamping force range of the battery cells after grouping, determined based on the key size parameters, is unreasonable, the current gap width to be tested is not accurate enough, and cannot be used as the final reserved gap width. The next gap width should be selected for testing / evaluation.

[0054] Additionally, it should be noted that the adjustment strategy for selecting the next gap width typically includes two cases: decreasing the width and increasing the width. The corresponding gap width to be measured is then reselected according to the adjustment strategy.

[0055] It is understandable that there are three situations where the tightening force range of the first group does not conform to the individual tightening force range of the gap to be tested: the upper limit of the tightening force of the first group is greater than the upper limit of the individual tightening force, and the lower limit of the tightening force of the first group is greater than or equal to the lower limit of the individual tightening force. and The upper limit of the first group's fastening force is less than or equal to the upper limit of the individual fastening force, and the lower limit of the first group's fastening force is less than the lower limit of the individual fastening force. and The upper limit of the fastening force of the first group is greater than the upper limit of the fastening force of the individual unit, and the lower limit of the fastening force of the first group is less than the lower limit of the fastening force of the individual unit, that is... and .

[0056] It should be understood that if the upper limit of the first group's tightening force is greater than the upper limit of the individual tightening force, and the lower limit of the first group's tightening force is greater than or equal to the lower limit of the individual tightening force, it indicates that the width of the gap to be measured is too large. In this case, a smaller gap width can be selected as the new gap width to be measured. If the upper limit of the first group's tightening force is less than or equal to the upper limit of the individual tightening force, and the lower limit of the first group's tightening force is less than the lower limit of the individual tightening force, it indicates that the width of the gap to be measured is too small. In this case, a larger gap width can be selected as the new gap width to be measured. If the upper limit of the first group's tightening force is greater than the upper limit of the individual tightening force, and the lower limit of the first group's tightening force is less than the lower limit of the individual tightening force, it indicates that the selected gap width is completely unsuitable, and it is necessary to use other methods to reselect it, or even reset multiple gap widths.

[0057] In one feasible implementation, when the upper limit of the first group fastening force range is greater than the upper limit of the individual fastening force range, a new gap width to be measured is selected from the gap widths based on a width reduction adjustment strategy; when the lower limit of the first group fastening force range is less than the lower limit of the individual fastening force range, a new gap width to be measured is selected from the gap widths based on a width increase adjustment strategy.

[0058] It should be noted that the width increase adjustment strategy means that the width needs to be appropriately increased when selecting the next gap width, while the width decrease adjustment strategy means that the width needs to be appropriately decreased when selecting the next gap width. The upper limit of the fastening force range of the first group is greater than the upper limit of the fastening force range of the individual unit, that is, the upper limit of the fastening force of the first group is greater than the upper limit of the fastening force of the individual unit. The lower limit of the fastening force range of the first group is less than the lower limit of the fastening force range of the individual unit, that is, the lower limit of the fastening force of the first group is less than the lower limit of the fastening force of the individual unit.

[0059] It is understandable that, since the probability of the first group's upper limit of fastening force being greater than the individual fastening force's upper limit and the first group's lower limit of fastening force being less than the individual fastening force's lower limit is low, in this embodiment, "the first group's upper limit of fastening force is greater than the individual fastening force's upper limit" can be used to refer to the situation where the first group's upper limit of fastening force is greater than the individual fastening force's upper limit and the first group's lower limit of fastening force is greater than or equal to the individual fastening force's lower limit, and "the first group's lower limit of fastening force is less than the individual fastening force's lower limit" can be used to refer to the situation where the first group's upper limit of fastening force is less than or equal to the individual fastening force's upper limit and the first group's lower limit of fastening force is less than the individual fastening force's lower limit.

[0060] It should be understood that if the upper limit of the fastening force of the first group is greater than the upper limit of the fastening force of the individual unit, a smaller gap width is selected as the gap width to be measured according to the width reduction adjustment strategy. If the lower limit of the fastening force of the first group is less than the lower limit of the fastening force of the individual unit, a larger gap width is selected as the gap width to be measured according to the width increase adjustment strategy. In practice, this is usually done by slightly increasing / decreasing the current gap width to be measured for fine-tuning.

[0061] Step S40: When the second grouping clamping force range meets the single-cell clamping force range of the gap width to be measured, the gap width to be measured is taken as the target reserved gap width when the battery cells are grouped together.

[0062] It should be noted that the second group of tightening force range conforms to the individual tightening force range of the gap width to be measured. That is, the upper limit of the second group of tightening force (the upper limit of the second group of tightening force range) is less than or equal to the upper limit of the individual tightening force of the gap width to be measured (the upper limit of the individual tightening force range), and the lower limit of the second group of tightening force (the lower limit of the second group of tightening force range) is greater than or equal to the lower limit of the individual tightening force of the gap width to be measured (the lower limit of the individual tightening force range).

[0063] Understandably, if the second grouping clamping force range matches the individual cell clamping force range of the gap width to be tested, it indicates that the clamping force range of the battery cells after grouping, determined based on the cyclic charge-discharge test, is reasonable. In this case, the current gap width to be tested can be considered as the final reserved gap width, i.e., the target reserved gap width. In practical implementation, additional data verification can be added to further improve the accuracy of the target reserved gap width.

[0064] Furthermore, in one feasible implementation, when the second grouping clamping force range does not conform to the single-cell clamping force range of the gap width to be measured, a new gap width to be measured is selected from the gap widths; based on the newly selected gap width to be measured, the step of determining the first grouping clamping force range is returned to the execution based on the key dimension parameters of the battery module obtained by grouping the battery cells under the gap width to be measured.

[0065] It should be noted that if the second grouping clamping force range does not conform to the individual cell clamping force range of the gap to be tested, it indicates that the clamping force range of the battery cells after grouping, determined based on the cyclic charge-discharge test, is unreasonable, the current gap width to be tested is not accurate enough, and cannot be used as the final reserved gap width. The next gap width should be selected for testing / evaluation.

[0066] It is understandable that there are three situations where the tightening force range of the second group does not conform to the individual tightening force range of the gap to be tested: the upper limit of the tightening force of the second group is greater than the upper limit of the individual tightening force, and the lower limit of the tightening force of the second group is greater than or equal to the lower limit of the individual tightening force. and The upper limit of the second group's fastening force is less than or equal to the upper limit of the individual fastening force, and the lower limit of the second group's fastening force is less than the lower limit of the individual fastening force. and The upper limit of the second group's fastening force is greater than the upper limit of the individual fastening force, and the lower limit of the second group's fastening force is less than the lower limit of the individual fastening force. and .

[0067] It should be understood that if the upper limit of the second group's tightening force is greater than the upper limit of the individual tightening force, and the lower limit of the second group's tightening force is greater than or equal to the lower limit of the individual tightening force, it indicates that the width of the gap to be measured is too large. In this case, a smaller gap width can be selected as the new gap width to be measured. If the upper limit of the second group's tightening force is less than or equal to the upper limit of the individual tightening force, and the lower limit of the second group's tightening force is less than the lower limit of the individual tightening force, it indicates that the width of the gap to be measured is too small. In this case, a larger gap width can be selected as the new gap width to be measured. If the upper limit of the second group's tightening force is greater than the upper limit of the individual tightening force, and the lower limit of the second group's tightening force is less than the lower limit of the individual tightening force, it indicates that the selected gap width is completely unsuitable, and it is necessary to use other methods to reselect it, or even reset multiple gap widths.

[0068] In one feasible implementation, when the upper limit of the second group fastening force range is greater than the upper limit of the individual fastening force range, a new gap width to be measured is selected from the gap widths based on a width reduction adjustment strategy; when the lower limit of the second group fastening force range is less than the lower limit of the individual fastening force range, a new gap width to be measured is selected from the gap widths based on a width increase adjustment strategy.

[0069] It should be noted that the upper limit of the second group's fastening force range is greater than the upper limit of the individual fastening force range, that is, the upper limit of the second group's fastening force is greater than the upper limit of the individual fastening force. The lower limit of the second group's fastening force range is less than the lower limit of the individual fastening force range, that is, the lower limit of the second group's fastening force is less than the lower limit of the individual fastening force.

[0070] It is understandable that, since the probability of the second group's upper limit of fastening force being greater than the individual fastening force's upper limit and the second group's lower limit of fastening force being less than the individual fastening force's lower limit is low, in this embodiment, "the second group's upper limit of fastening force is greater than the individual fastening force's upper limit" can be used to refer to the situation where the second group's upper limit of fastening force is greater than the individual fastening force's upper limit and the second group's lower limit of fastening force is greater than or equal to the individual fastening force's lower limit, and "the second group's lower limit of fastening force is less than the individual fastening force's lower limit" can be used to refer to the situation where the first group's upper limit of fastening force is less than or equal to the individual fastening force's upper limit and the first group's lower limit of fastening force is less than the individual fastening force's lower limit.

[0071] It should be understood that if the upper limit of the second group's fastening force is greater than the upper limit of the individual fastening force, a smaller gap width is selected as the gap width to be measured according to the width reduction adjustment strategy. Conversely, if the lower limit of the second group's fastening force is less than the lower limit of the individual fastening force, a larger gap width is selected as the gap width to be measured according to the width increase adjustment strategy. In practice, this is usually done by slightly increasing / decreasing the current gap width to be measured for fine-tuning.

[0072] This embodiment provides a method for determining the reserved gap width of battery cells. Based on the life test results of battery cells at different gap widths, the method determines the cell clamping force range corresponding to each gap width. A test gap width is selected from the gap widths. Based on the key dimensional parameters of the battery module obtained by assembling battery cells at the test gap width, a first grouping clamping force range is determined. When the first grouping clamping force range meets the cell clamping force range of the test gap width, a second grouping clamping force range of the battery module determined in the cyclic charge-discharge test is obtained. When the second grouping clamping force range meets the cell clamping force range of the test gap width, the test gap width is used as the target reserved gap width when assembling battery cells. This embodiment verifies the upper and lower limits of the clamping force after battery cell assembly, ensuring that the force on battery cells after assembly based on the target gap is within a reasonable range. This improves the accuracy of gap design, extends battery life, and enhances vehicle safety.

[0073] Based on the first embodiment of this application, in the second embodiment of this application, the content that is the same as or similar to that in Embodiment 1 above can be referred to the above description, and will not be repeated hereafter. Based on this, please refer to... Figure 3 Step S20 may include steps S201 to S204: Step S201: Based on the key dimension parameters of the battery module obtained by grouping the battery cells together under the width of the gap to be measured, determine the maximum deformation and the minimum deformation. It should be noted that the key dimensional parameters include at least the upper deviation dimension of the module, the lower deviation dimension of the module, the upper deviation dimension of the mounting beam, and the lower deviation dimension of the mounting beam. The battery module's dimensions are compressed when it is placed in the enclosure. The upper deviation dimension of the module is the maximum dimension of the battery module in the direction of the clamping force, and the lower deviation dimension is the minimum dimension of the battery module in the direction of the clamping force. The upper deviation dimension of the mounting beam is the maximum dimension of the enclosure mounting beam in the direction of the clamping force after the battery module is placed in the enclosure, and the lower deviation dimension is the minimum dimension of the enclosure mounting beam in the direction of the clamping force after the battery module is placed in the enclosure.

[0074] Additionally, it should be noted that the maximum deformation is the maximum value of the deformation caused by compression after the module is placed into the box, and the minimum deformation is the minimum value of the deformation caused by compression after the module is placed into the box.

[0075] In one feasible implementation, the step of determining the maximum and minimum deformation amounts based on the key dimensional parameters of the battery module obtained by grouping the individual battery cells under the width of the gap to be measured may include: determining the maximum deformation amount based on the upper deviation dimension of the battery module and the lower deviation dimension of the mounting beam; and determining the minimum deformation amount based on the lower deviation dimension of the battery module and the upper deviation dimension of the mounting beam.

[0076] Understandably, the maximum deformation is usually calculated based on the upper deviation dimension of the module and the lower deviation dimension of the mounting beam, and the calculation formula is as follows:

[0077] In the formula, Indicates the maximum deformation. Indicates the deviation dimension on the module. This indicates the deviation dimension of the mounting beam.

[0078] It should be understood that the minimum deformation is usually calculated based on the lower deviation dimension of the module and the upper deviation dimension of the mounting beam, and the calculation relationship is shown below:

[0079] In the formula, Indicates the maximum deformation. Indicates the lower deviation dimension of the module. This indicates the deviation dimension on the installation beam.

[0080] Step S202: Obtain the module elastic coefficient and the first correspondence between the module elastic coefficient, the maximum deformation and the first group fastening force upper limit; based on the module elastic coefficient, the maximum deformation and the first correspondence, obtain the first group fastening force upper limit. It should be noted that when the deformation of the module after it is placed in the box reaches its maximum value, the corresponding fastening force reaches the upper limit of the battery cell assembly, that is, the upper limit of the first assembly fastening force.

[0081] It is understandable that the upper limit of the first group's fastening force is related to the module's elastic coefficient and maximum deformation. The first correspondence between the module's elastic coefficient, maximum deformation, and the upper limit of the first group's fastening force is the calculation formula for the upper limit of the first group's fastening force, as shown below:

[0082] In the formula, This indicates the upper limit of the fastening force of the first group. This represents the module's elasticity coefficient. This represents the maximum deformation. Using the above-mentioned first correspondence, the corresponding upper limit of the first group fastening force can be calculated. .

[0083] It should be understood that the module elasticity coefficient is the elasticity coefficient of the battery module after the battery cells are assembled.

[0084] In one feasible implementation, the step of determining the module elasticity coefficient includes: obtaining the battery cell elasticity coefficient, the number of battery cells, the elasticity coefficient of key assembly components, and a third correspondence between the number of key assembly components and the module elasticity coefficient; obtaining the battery cell elasticity coefficient, the number of battery cells, the elasticity coefficient of key assembly components, and the number of key assembly components; and determining the module elasticity coefficient based on the battery cell elasticity coefficient, the number of battery cells, the elasticity coefficient of key assembly components, the number of key assembly components, and the third correspondence.

[0085] It should be noted that the elastic coefficient of a single battery cell refers to its elastic coefficient before assembly, and the number of battery cells refers to the number of battery cells integrated into the battery module. Key assembly components refer to other key components in the battery module besides the battery cells, such as end plates, end-face insulating pads, buffer pads, spacers, and double-sided adhesive. This embodiment does not specifically limit these components. For example, refer to... Figure 4 End face insulating pads and spacers can be selected as key assembly components. Spacers are placed between battery cells, and end face insulating pads are placed on the outermost side. The elastic coefficient of a key assembly component is the elastic coefficient of each key assembly component, and the number of key assembly components is the number of each key assembly component.

[0086] Understandably, the module elasticity coefficient needs to be determined based on the battery cell elasticity coefficient, the number of battery cells, the elasticity coefficient of key assembly components, and the number of key assembly components. The third correspondence between the battery cell elasticity coefficient, the number of battery cells, the elasticity coefficient of key assembly components, the number of key assembly components, and the module elasticity coefficient, i.e., the calculation formula for the module elasticity coefficient, is as follows:

[0087] In the formula, This represents the module's elasticity coefficient. Indicates the elastic coefficient of a single battery cell. Indicates the number of individual battery cells. These represent the elastic coefficients of different key group components. For the first The elastic modulus of a key component group, These represent the quantities of different key group components. For the first The number of key group components. Using the third correspondence mentioned above, the corresponding module elastic coefficient can be calculated.

[0088] Step S203: Obtain the second correspondence between the module elastic coefficient, the minimum deformation amount and the first group fastening force lower limit; based on the module elastic coefficient, the minimum deformation amount and the second correspondence, obtain the first group fastening force lower limit. It should be noted that when the deformation of the module after it is placed in the box reaches the minimum value, the corresponding fastening force reaches the lower limit of the battery cell pack, that is, the lower limit of the first packing fastening force.

[0089] Understandably, the lower limit of the first group fastening force is related to the module's elastic coefficient and minimum deformation. The second correspondence between the module's elastic coefficient, minimum deformation, and the lower limit of the first group fastening force—that is, the calculation formula for the lower limit of the first group fastening force—is as follows:

[0090] In the formula, This indicates the lower limit of the first group's fastening force. This represents the module's elasticity coefficient. This represents the minimum deformation. Using the second correspondence mentioned above, the corresponding lower limit of the first group fastening force can be calculated. .

[0091] Step S204: Based on the upper limit of the first group fastening force and the lower limit of the first group fastening force, the range of the first group fastening force is obtained.

[0092] Understandably, this is based on the upper limit of the first group's fastening force. and the first group of lower limit of fastening force The first group of fastening force range is obtained. .

[0093] This embodiment provides a method for determining the reserved gap width of battery cells. Based on the key dimensional parameters of the battery module obtained by assembling battery cells at the measured gap width, the maximum and minimum deformation amounts are determined. The method obtains the module elastic coefficient and a first correspondence between the module elastic coefficient, the maximum deformation amount, and the upper limit of the first assembly fastening force. Based on the module elastic coefficient, the maximum deformation amount, and the first correspondence, the upper limit of the first assembly fastening force is obtained. A second correspondence between the module elastic coefficient, the minimum deformation amount, and the lower limit of the first assembly fastening force is obtained. Based on the module elastic coefficient, the minimum deformation amount, and the second correspondence, the lower limit of the first assembly fastening force is obtained. Based on the upper and lower limits of the first assembly fastening force, the range of the first assembly fastening force is obtained. This embodiment calculates the upper and lower limits of the fastening force after battery cell assembly based on dimensional parameters, and verifies the upper and lower limits of the fastening force after assembly using the fastening force range when the battery cells are not assembled. This ensures that the force on the battery cells after assembly based on the target gap is within a reasonable range, which can improve the accuracy of gap design, extend battery life, and improve vehicle safety.

[0094] Based on the first embodiment of this application, in the third embodiment of this application, the content that is the same as or similar to that in the first embodiment described above can be referred to the above description, and will not be repeated hereafter. Based on this, please refer to... Figure 5 Step S40 may include steps S401 to S403: Step S401: When the second group fastening force range meets the single-cell fastening force range of the gap width to be tested, acquire the thermal runaway test data and thermal runaway temperature threshold of the battery cell under the gap width to be tested. It should be noted that the target reserved gap width must also meet the thermal diffusion requirements. That is, after grouping according to the target reserved gap width, the target reserved gap width can effectively block the heat transfer of the thermally runaway cells and avoid the risk of cascading thermal runaway caused by the ignition of adjacent cells. Therefore, further thermal runaway testing / simulation of the battery cells is conducted, and the obtained test results / simulation results are the thermal runaway test data.

[0095] Additionally, it should be noted that the thermal runaway temperature threshold is the highest temperature value that can ensure the safety of the battery cell, for example: 200℃.

[0096] Step S402: Based on the thermal runaway test data, determine the temperature of adjacent cells when the battery cell experiences thermal runaway; It should be noted that the temperature of the adjacent cell is the temperature of the cell next to it when the battery cell experiences thermal runaway.

[0097] Step S403: When the temperature of the adjacent cells is less than or equal to the thermal runaway temperature threshold, the width of the gap to be measured is taken as the target reserved gap width when the battery cells are assembled.

[0098] It is understandable that if the temperature of the adjacent cells is less than or equal to the thermal runaway temperature threshold, it means that after the heat transfer from the thermal runaway cell, the temperature of the adjacent cells remains within a safe range. In other words, the gap width used at this time can effectively block the heat transfer from the thermal runaway cell, that is, the gap width to be measured meets the thermal diffusion requirements and can be used as the target reserved gap width.

[0099] When the temperature of the adjacent cell exceeds the thermal runaway temperature threshold, a new gap width to be measured is selected from the gap widths based on the width increase adjustment strategy; based on the newly selected gap width to be measured, the process returns to the step of obtaining the key size parameters of the battery module corresponding to the battery cells after they are grouped together based on the gap width to be measured.

[0100] It should be understood that if the temperature of an adjacent cell is greater than the thermal runaway temperature threshold, it means that after the heat transfer from the thermal runaway cell, the temperature of the adjacent cell cannot be kept within a safe range. In this case, the gap width used cannot effectively block the heat transfer from the thermal runaway cell, and the width needs to be appropriately increased. Thus, according to the width increase adjustment strategy, a larger gap width is selected as the gap width to be tested, and the fastening force is rechecked.

[0101] This embodiment provides a method for determining the reserved gap width of a battery cell. It acquires thermal runaway test data of the battery cell at the desired gap width, determines the temperature of adjacent cells during thermal runaway based on the test data, obtains a thermal runaway temperature threshold, and uses the desired gap width as the target reserved gap width when assembling the battery cells. After verifying the clamping force, this embodiment further verifies the thermal diffusion capability, finding a target reserved gap width that meets both clamping force and thermal diffusion requirements. This ensures that the stress on the battery cells after assembly based on the target gap is within a reasonable range, improving the accuracy of gap design, extending battery life, and effectively blocking heat transfer from thermally runaway cells, avoiding the risk of cascading thermal runaway, and further improving safety.

[0102] It should be noted that the above examples are only for understanding this application and do not constitute a limitation on the method for determining the reserved gap width of the battery cell in this application. Any simple modifications based on this technical concept are within the protection scope of this application.

[0103] This application also provides a battery module, which includes a preset number of battery cells, and the reserved gap width between the battery cells is obtained by the steps of the battery cell reserved gap width determination method provided in the above embodiments.

[0104] This application also provides a battery pack, which includes the above-mentioned battery module.

[0105] This application also provides a device for determining the width of the reserved gap between battery cells. Please refer to [reference needed]. Figure 6 The device for determining the reserved gap width of a single battery cell includes: The single cell measurement module 10 is used to determine the range of single cell fastening force corresponding to each gap width based on the life test results of the single cell at different gap widths. Group verification module 20 is used to select the gap width to be tested from the gap widths, and determine the first grouping fastening force range based on the key size parameters of the battery module obtained by grouping the battery cells under the gap width to be tested. The group verification module 20 is also used to obtain the second group clamping force range of the battery module determined in the cyclic charge-discharge test when the first group clamping force range conforms to the single-cell clamping force range of the gap width to be tested. The grouping verification module 20 is further configured to use the gap width to be measured as the target reserved gap width when the second grouping clamping force range meets the single-cell clamping force range of the gap width to be measured.

[0106] In one feasible implementation, the life test results include at least a first correspondence curve between the upper limit of the fastening force and the battery life and a second correspondence curve between the lower limit of the fastening force and the battery life. The single cell measurement module 10 is also used to determine the upper limit of the fastening force of the multiple battery cells under different gap widths based on the target battery life and the first correspondence curves of the multiple battery cells under different gap widths. Based on the upper limit of the clamping force of the multiple battery cells under different gap widths, the upper limit of the clamping force of each cell at each gap width is determined; Based on the target battery life and the second corresponding relationship curve of the plurality of battery cells under different gap widths, the lower limit of the fastening force of the plurality of battery cells under different gap widths is determined respectively. Based on the lower limit of the clamping force of the multiple battery cells at different gap widths, the lower limit of the clamping force of each cell at each gap width is determined. Based on the upper limit and lower limit of the individual unit fastening force for each gap width, the range of individual unit fastening force for each gap width is determined.

[0107] In one feasible implementation, the group verification module 20 is further used to determine the maximum deformation and minimum deformation based on the key dimension parameters of the battery module obtained by grouping the battery cells under the width of the gap to be measured. Obtain the module elasticity coefficient and the first correspondence between the module elasticity coefficient, the maximum deformation, and the upper limit of the first group fastening force; Based on the module elastic coefficient, the maximum deformation, and the first correspondence, the upper limit of the first group fastening force is obtained; Obtain the second correspondence between the module's elastic coefficient, minimum deformation, and the lower limit of the first grouping fastening force; Based on the module elastic coefficient, the minimum deformation, and the second correspondence, the lower limit of the first group fastening force is obtained; The first group fastening force range is obtained based on the upper limit of the first group fastening force and the lower limit of the first group fastening force.

[0108] In one feasible implementation, the key dimension parameters include at least the upper deviation dimension of the module, the lower deviation dimension of the module, the upper deviation dimension of the mounting beam, and the lower deviation dimension of the mounting beam. The group verification module 20 is also used to determine the maximum deformation based on the upper deviation dimension of the battery module and the lower deviation dimension of the mounting beam. The minimum deformation is determined based on the lower deviation dimension of the battery module and the upper deviation dimension of the mounting beam.

[0109] In one feasible implementation, the group verification module 20 is also used for...

[0110] In one feasible implementation, the group verification module 20 is further used to obtain the elastic coefficient of a single battery cell, the number of single battery cells, the elastic coefficient of a key group component, and a third correspondence between the number of key group components and the elastic coefficient of the module. Obtain the elastic coefficient of a single battery cell, the number of single battery cells, the elastic coefficient of key assembly components, and the number of key assembly components; The module elastic coefficient is determined based on the elastic coefficient of the individual battery cell, the number of individual battery cells, the elastic coefficient of the key assembly component, the number of key assembly components, and the third correspondence.

[0111] In one feasible implementation, the group verification module 20 is further configured to reselect the gap width to be measured from the gap widths when the first group fastening force range does not conform to the individual fastening force range of the gap width to be measured or the second group fastening force range does not conform to the individual fastening force range of the gap width to be measured. Based on the reselected gap width to be measured, return to the step of determining the first grouping clamping force range by analyzing the key dimension parameters of the battery module obtained by grouping the battery cells together under the gap width to be measured.

[0112] In one feasible implementation, the group verification module 20 is further configured to, based on a width reduction adjustment strategy, reselect the gap width to be measured from the gap widths when the upper limit of the first group fastening force range is greater than the upper limit of the individual fastening force range. When the lower limit of the first group fastening force range is less than the lower limit of the individual fastening force range, the gap width to be measured is reselected from the gap widths based on the width increase adjustment strategy.

[0113] In one feasible implementation, the group verification module 20 is further configured to, based on a width reduction adjustment strategy, reselect the gap width to be measured from the gap widths when the upper limit of the second group fastening force range is greater than the upper limit of the single-unit fastening force range. When the lower limit of the second group fastening force range is less than the lower limit of the single-unit fastening force range, the gap width to be measured is reselected from the gap widths based on the width increase adjustment strategy.

[0114] In one feasible implementation, the group verification module 20 is further used to acquire the thermal runaway test data of the battery cell under the width of the gap to be tested and the thermal runaway temperature threshold. Based on the thermal runaway test data, the temperatures of adjacent cells during the thermal runaway of the battery cell are determined; When the temperature of the adjacent cells is less than or equal to the thermal runaway temperature threshold, the step of using the width of the gap to be measured as the target reserved gap width when the battery cells are grouped together is performed.

[0115] The battery cell reserved gap width determination device provided in this application, employing the battery cell reserved gap width determination method in the above embodiments, can solve the technical problem that directly using the ideal gap value tested for a single cell as the gap value for a group of cells is not accurate enough, thus affecting battery life. Compared with the prior art, the beneficial effects of the battery cell reserved gap width determination device provided in this application are the same as those of the battery cell reserved gap width determination method provided in the above embodiments, and other technical features in the battery cell reserved gap width determination device are the same as those disclosed in the methods of the above embodiments, and will not be repeated here.

[0116] This application provides a device for determining the reserved gap width of a battery cell. The device includes: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to perform the battery cell reserved gap width determination method in the above embodiment 1.

[0117] The following is for reference. Figure 7 This document illustrates a structural schematic diagram of a battery cell reserved gap width determination device suitable for implementing embodiments of this application. The battery cell reserved gap width determination device in embodiments of this application may include, but is not limited to, mobile terminals such as mobile phones, laptops, digital broadcast receivers, PDAs (Personal Digital Assistants), PADs (Portable Application Description), PMPs (Portable Media Players), in-vehicle terminals (e.g., in-vehicle navigation terminals), and fixed terminals such as digital TVs and desktop computers. Figure 7 The battery cell clearance width determination device shown is merely an example and should not impose any limitations on the functionality and scope of use of the embodiments of this application.

[0118] like Figure 7As shown, the battery cell clearance width determination device may include a processing unit 1001 (e.g., a central processing unit, a graphics processor, etc.), which can perform various appropriate actions and processes according to a program stored in ROM (Read Only Memory) 1002 or a program loaded from storage device 1003 into RAM (Random Access Memory) 1004. RAM 1004 also stores various programs and data required for the operation of the battery cell clearance width determination device. The processing unit 1001, ROM 1002, and RAM 1004 are interconnected via bus 1005. Input / output (I / O) interface 1006 is also connected to the bus. Typically, the following systems can be connected to I / O interface 1006: input devices 1007 including, for example, touchscreens, touchpads, keyboards, mice, image sensors, microphones, accelerometers, gyroscopes, etc.; output devices 1008 including, for example, liquid crystal displays (LCDs), speakers, vibrators, etc.; storage devices 1003 including, for example, magnetic tapes, hard disks, etc.; and communication devices 1009. Communication device 1009 allows the battery cell clearance width determination device to communicate wirelessly or wiredly with other devices to exchange data. Although the figure shows a battery cell clearance width determination device with various systems, it should be understood that it is not required to implement or possess all the systems shown. More or fewer systems can be implemented alternatively.

[0119] Specifically, according to the embodiments disclosed in this application, the processes described above with reference to the flowcharts can be implemented as computer software programs. For example, embodiments disclosed in this application include a computer program product comprising a computer program carried on a computer-readable medium, the computer program containing program code for performing the methods shown in the flowcharts. In such embodiments, the computer program can be downloaded and installed from a network via a communication device, or installed from storage device 1003, or installed from ROM 1002. When the computer program is executed by processing device 1001, it performs the functions defined in the methods of the embodiments disclosed in this application.

[0120] The battery cell reserved gap width determination device provided in this application, employing the battery cell reserved gap width determination method in the above embodiments, can solve the technical problem that directly using the ideal gap value tested for a single cell as the gap value for a group of cells is not accurate enough, thus affecting battery life. Compared with the prior art, the beneficial effects of the battery cell reserved gap width determination device provided in this application are the same as those of the battery cell reserved gap width determination method provided in the above embodiments, and other technical features in this battery cell reserved gap width determination device are the same as those disclosed in the previous embodiment method, and will not be repeated here.

[0121] It should be understood that the various parts disclosed in this application can be implemented using hardware, software, firmware, or a combination thereof. In the description of the above embodiments, specific features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples.

[0122] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

[0123] This application provides a computer-readable storage medium having computer-readable program instructions (i.e., a computer program) stored thereon, the computer-readable program instructions being used to execute the battery cell reserved gap width determination method in the above embodiments.

[0124] The computer-readable storage medium provided in this application may be, for example, a USB flash drive, but is not limited to, electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices, or any combination thereof. More specific examples of computer-readable storage media may include, but are not limited to: electrical connections having one or more wires, portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof. In this embodiment, the computer-readable storage medium may be any tangible medium containing or storing a program that can be used by or in conjunction with an instruction execution system, system, or device. The program code contained on the computer-readable storage medium may be transmitted using any suitable medium, including but not limited to: wires, optical cables, RF (Radio Frequency), etc., or any suitable combination thereof.

[0125] The aforementioned computer-readable storage medium may be included in the device for determining the reserved gap width of the battery cell; or it may exist independently and not be assembled into the device for determining the reserved gap width of the battery cell.

[0126] The aforementioned computer-readable storage medium carries one or more programs. When these programs are executed by the battery cell reserved gap width determination device, the battery cell reserved gap width determination device: determines the cell clamping force range corresponding to each gap width based on the life test results of the battery cells at different gap widths; selects the gap width to be tested from the gap widths, and determines a first grouping clamping force range based on the key size parameters of the battery module obtained by grouping the battery cells at the gap width to be tested; when the first grouping clamping force range meets the cell clamping force range of the gap width to be tested, obtains a second grouping clamping force range of the battery module determined in the cyclic charge-discharge test; when the second grouping clamping force range meets the cell clamping force range of the gap width to be tested, uses the gap width to be tested as the target reserved gap width when grouping the battery cells.

[0127] Computer program code for performing the operations of this application can be written in one or more programming languages ​​or a combination thereof, including object-oriented programming languages ​​such as Java, Smalltalk, and C++, and conventional procedural programming languages ​​such as the "C" language or similar programming languages. The program code can be executed entirely on the user's computer, partially on the user's computer, as a standalone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving remote computers, the remote computer can be connected to the user's computer via any type of network—including a Local Area Network (LAN) or a Wide Area Network (WAN)—or can be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0128] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to various embodiments of this application. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions indicated in the blocks may occur in a different order than those indicated in the drawings. For example, two consecutively indicated blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, can be implemented using a dedicated hardware-based system that performs the specified function or operation, or using a combination of dedicated hardware and computer instructions.

[0129] The modules described in the embodiments of this application can be implemented in software or hardware. The names of the modules do not necessarily limit the functionality of the unit itself.

[0130] The readable storage medium provided in this application is a computer-readable storage medium that stores computer-readable program instructions (i.e., a computer program) for executing the above-described method for determining the reserved gap width of a single battery cell. This solves the technical problem that directly using the ideal gap value from a single cell test as the gap value for a group of cells is inaccurate and affects battery life. Compared with the prior art, the beneficial effects of the computer-readable storage medium provided in this application are the same as those of the battery cell reserved gap width determination method provided in the above embodiments, and will not be repeated here.

[0131] This application also provides a computer program product, including a computer program that, when executed by a processor, implements the steps of the method for determining the reserved gap width of a battery cell as described above.

[0132] The computer program product provided in this application can solve the technical problem that directly using the ideal gap value tested for a single cell as the gap value for a group of cells is not accurate enough, thus affecting battery life. Compared with the prior art, the beneficial effects of the computer program product provided in this application are the same as those of the battery cell reserved gap width determination method provided in the above embodiments, and will not be repeated here.

[0133] The above are only some embodiments of this application and do not limit the patent scope of this application. All equivalent structural transformations made under the technical concept of this application and using the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included in the patent protection scope of this application.

Claims

1. A method for determining the width of the reserved gap in a single battery cell, characterized in that, The method comprises: determining a cell fastening force range corresponding to each gap width based on a life test result of the battery cell under different gap widths; selecting a to-be-tested gap width from the gap widths, and determining a first group fastening force range based on a key dimension parameter of a battery module obtained by grouping the battery cell under the to-be-tested gap width; when the first group fastening force range meets the cell fastening force range of the to-be-tested gap width, obtaining a second group fastening force range of the battery module determined in a cycle charge-discharge test; when the second group fastening force range meets the cell fastening force range of the to-be-tested gap width, taking the to-be-tested gap width as a target reserved gap width when the battery cell is grouped.

2. The method of claim 1, wherein, The life test result at least comprises a first corresponding relationship curve between an upper fastening force limit and a battery life and a second corresponding relationship curve between a lower fastening force limit and the battery life; The step of determining the cell fastening force range corresponding to each gap width based on the life test result of the battery cell under different gap widths comprises: determining an upper fastening force limit of each of the plurality of battery cells under different gap widths based on a target battery life and the first corresponding relationship curve of the plurality of battery cells under different gap widths; determining an upper cell fastening force limit of each gap width based on the upper fastening force limit of the plurality of battery cells under different gap widths; determining a lower fastening force limit of each of the plurality of battery cells under different gap widths based on the target battery life and the second corresponding relationship curve of the plurality of battery cells under different gap widths; determining a lower cell fastening force limit of each gap width based on the lower fastening force limit of the plurality of battery cells under different gap widths; determining the cell fastening force range of each gap width based on the upper cell fastening force limit and the lower cell fastening force limit of each gap width.

3. The method of claim 1, wherein, The step of determining the first group fastening force range based on the key dimension parameter of the battery module obtained by grouping the battery cell under the to-be-tested gap width comprises: determining a maximum deformation amount and a minimum deformation amount based on the key dimension parameter of the battery module obtained by grouping the battery cell under the to-be-tested gap width; obtaining a module elastic coefficient and a first corresponding relationship among the module elastic coefficient, the maximum deformation amount, and a first group fastening force upper limit; obtaining the first group fastening force upper limit based on the module elastic coefficient, the maximum deformation amount, and the first corresponding relationship; obtaining a second corresponding relationship among the module elastic coefficient, the minimum deformation amount, and a first group fastening force lower limit; obtaining the first group fastening force lower limit based on the module elastic coefficient, the minimum deformation amount, and the second corresponding relationship; obtaining the first group fastening force range based on the first group fastening force upper limit and the first group fastening force lower limit.

4. The method of claim 3, wherein, The key dimension parameter at least comprises a module upper deviation dimension, a module lower deviation dimension, an installation beam upper deviation dimension, and an installation beam lower deviation dimension; The step of determining the maximum deformation amount and the minimum deformation amount based on the key dimension parameter of the battery module obtained by grouping the battery cell under the to-be-tested gap width comprises: determine the maximum deformation based on the module upper deviation size and the mounting beam lower deviation size of the battery module; determine the minimum deformation based on the module lower deviation size and the mounting beam upper deviation size of the battery module.

5. The method of claim 3, wherein, The method further comprises: obtaining a third correspondence relationship between the battery cell elastic coefficient, the battery cell quantity, the key grouping component elastic coefficient, the key grouping component quantity and the module elastic coefficient; obtaining the battery cell elastic coefficient, the battery cell quantity, the key grouping component elastic coefficient and the key grouping component quantity; determining the module elastic coefficient based on the battery cell elastic coefficient, the battery cell quantity, the key grouping component elastic coefficient, the key grouping component quantity and the third correspondence relationship.

6. The method of claim 1, wherein, The method further comprises: when the first grouping fastening force range does not conform to the single cell fastening force range of the to-be-tested gap width or the second grouping fastening force range does not conform to the single cell fastening force range of the to-be-tested gap width, reselecting a to-be-tested gap width from the gap width; based on the reselected to-be-tested gap width, returning to execute the step of determining the first grouping fastening force range based on the key size parameters of the battery module obtained by grouping the battery cells under the to-be-tested gap width.

7. The method of claim 6, wherein, The step of reselecting a to-be-tested gap width from the gap width comprises: when the upper limit of the first grouping fastening force range is greater than the upper limit of the single cell fastening force range, reselecting a to-be-tested gap width from the gap width based on a width reduction adjustment strategy; when the lower limit of the first grouping fastening force range is less than the lower limit of the single cell fastening force range, reselecting a to-be-tested gap width from the gap width based on a width increase adjustment strategy.

8. The method of claim 6, wherein, The step of reselecting a to-be-tested gap width from the gap width comprises: when the upper limit of the second grouping fastening force range is greater than the upper limit of the single cell fastening force range, reselecting a to-be-tested gap width from the gap width based on a width reduction adjustment strategy; when the lower limit of the second grouping fastening force range is less than the lower limit of the single cell fastening force range, reselecting a to-be-tested gap width from the gap width based on a width increase adjustment strategy.

9. The method of claim 1, wherein, The step of reselecting a to-be-tested gap width from the gap width comprises: obtaining thermal runaway test data of the battery cells under the to-be-tested gap width and a thermal runaway temperature threshold value; determining the temperature of the adjacent cell when the battery cell is in thermal runaway based on the thermal runaway test data; when the temperature of the adjacent cell is less than or equal to the thermal runaway temperature threshold value, executing the step of taking the to-be-tested gap width as the target reserved gap width when the battery cells are grouped.

10. A battery cell reserved gap width determination apparatus, characterized by, The device comprises: a single cell determination module configured to determine a single cell fastening force range corresponding to each gap width based on the life test results of the battery cells under different gap widths; a grouping checking module configured to select a to-be-tested gap width from the gap width, and determine a first grouping fastening force range based on the key size parameters of the battery module obtained by grouping the battery cells under the to-be-tested gap width. The group checking module is further configured to acquire a second group fastening force range of the battery module determined in a cyclic charging and discharging test when the first group fastening force range conforms to the single-body fastening force range of the to-be-tested gap width. The group checking module is further configured to take the to-be-tested gap width as a target reserved gap width when the second group fastening force range conforms to the single-body fastening force range of the to-be-tested gap width.

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