Method for stacking battery cells into box

Abstract

The invention discloses a method for stacking battery cells into a box, and relates to the technical field of batteries, and the method comprises the following steps: determining the total number of battery cells required for forming a battery module and the internal width of a box body according to the electric quantity value of the battery module and the theoretical thickness of the battery cells, determining the total number of flexible plates required by the battery module and the initial thickness of each flexible plate according to the internal width of the box body, the total number of battery cells required by the battery module and a preset battery cell thickness deviation range, obtaining the actual thickness of each battery cell, and calculating the deviation between the actual thickness of each battery cell and the theoretical thickness of each battery cell; the flexible plates with the determined total number and initial thickness are selected, the battery cells with the determined total number and the deviation between the actual thickness and the theoretical thickness within the preset battery cell thickness deviation range are selected, the battery cells and the flexible plates are combined and stacked to form the battery module, and then the battery module is clamped and put into a box, so that the difficulty of putting the battery cells into the box is reduced, and the efficiency and quality of putting the battery cells into the box are improved; and the reliability, durability and safety of the power battery are ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to a method for stacking battery cells into boxes. Background Art

[0002] With the rapid development of the new energy vehicle market, CTP (cell-to-pack) power batteries have been widely used due to their high energy density and low cost. In the production process of CTP power batteries, how to achieve efficient and stable stacking of battery cells into boxes has become one of the urgent problems to be solved.

[0003] In the prior art, a clamping tool is mainly used to clamp the battery cell to a predetermined position using a side plate, and then the battery cell is installed into the box body in an interference fit manner after being clamped by the clamping tool.

[0004] However, due to the dimensional deviation of battery cells during production, the clamping force of the clamping tooling equipment does not match the battery cell size. If the clamping force is too large, the battery cell will be damaged. If the clamping force is insufficient, gaps will exist, reducing the efficiency and quality of battery cell packaging. Summary of the Invention

[0005] An embodiment of the present invention provides a method for stacking battery cells into boxes to solve the technical problem in the related art that the clamping force of existing clamping tooling equipment does not match the battery cells. If the clamping force is too large, the battery cells will be damaged. If the clamping force is insufficient, gaps will exist, which reduces the efficiency and quality of battery cell boxing.

[0006] An embodiment of the present invention provides a method for stacking battery cells into a box, comprising:

[0007] Step S10, determining the total number of battery cells required to form the battery module and the internal width of the box according to the power value of the battery module and the theoretical thickness of the battery cells;

[0008] Step S20, determining the total number of flexible boards required for the battery module and the initial thickness of each flexible board based on the internal width of the box, the total number of battery cells required for the battery module, and a preset battery cell thickness deviation range;

[0009] Step S30, obtaining the actual thickness of each battery cell, and calculating the deviation between the actual thickness of each battery cell and the theoretical thickness of the battery cell;

[0010] Step S40: Select flexible boards with a determined total number and initial thickness, select battery cells with a determined total number and a deviation between the actual thickness and the theoretical thickness within a preset battery cell thickness deviation range, stack the battery cells and flexible boards to form a battery module, and then clamp them into a box.

[0011] In some embodiments, determining the total number of battery cells required to form the battery module and the internal width of the box according to the battery module's power value and the theoretical thickness of the battery cells includes:

[0012] Determining the total number of battery cells required to form the battery module based on the power value of the battery module;

[0013] The internal width of the box corresponding to the battery module is determined based on the total number of battery cells required to form the battery module and the theoretical thickness of the battery cells.

[0014] In some embodiments, determining the total number of battery cells required to form the battery module based on the power value of the battery module, and determining the internal width of the box corresponding to the battery module based on the total number of battery cells required to form the battery module and the theoretical thickness of the battery cells, includes:

[0015] The total number of cells required to form a battery module is calculated according to the following formula:

[0016]

[0017] Where n is the total number of cells required to form a battery module, Y is the charge value of the battery module, and y is the charge value of each cell;

[0018] Then calculate the internal width of the box corresponding to the battery module according to the following formula:

[0019] (n+j)·C=X;

[0020] Wherein, j is an integer greater than 1, C is the theoretical thickness of each battery cell, and X is the internal width of the box corresponding to the battery module.

[0021] In some embodiments, determining the total number of flexible boards required for the battery module and the initial thickness of each flexible board based on the internal width of the box, the total number of battery cells required for the battery module, and a preset battery cell thickness deviation range includes:

[0022] The total number of flexible boards required to form the battery module is one more than the total number of battery cells required to form the battery module.

[0023] In some embodiments, determining the total number of flexible boards required for the battery module and the initial thickness of each flexible board based on the internal width of the box, the total number of battery cells required for the battery module, and a preset battery cell thickness deviation range further includes:

[0024] Determine the total thickness range of the compressed flexible board required for the battery module based on the internal width of the box, the total number of cells required for the battery module, and the preset cell thickness deviation range;

[0025] The initial thickness of each flexible plate is determined based on the total thickness range of the flexible plates after compression required for the battery module and the total number of flexible plates required for the battery module.

[0026] In some embodiments, determining the total thickness range of the compressed flexible plate required for the battery module based on the internal width of the box, the total number of battery cells required for the battery module, and a preset battery cell thickness deviation range includes:

[0027] The total thickness range of the compressed flexible plate required for the battery module is calculated according to the following formula:

[0028]

[0029] in, is the total thickness of the flexible board after compression required for the battery module, C max The upper limit of the deviation between the theoretical thickness of each cell and the preset cell thickness, C min The lower limit of the deviation between the theoretical thickness of each battery cell and the preset battery cell thickness.

[0030] In some embodiments, determining the initial thickness of each flexible plate according to the total thickness range of the flexible plates after compression required by the battery module and the total number of flexible plates required by the battery module includes:

[0031] The initial thickness of each flexible board is calculated according to the following formula:

[0032]

[0033] Where P' is the initial thickness of each flexible board, C max The upper limit of the deviation between the theoretical thickness of each battery cell and the preset battery cell thickness.

[0034] In some embodiments, the method of selecting a determined total number and initial thickness of flexible boards, selecting a determined total number of battery cells whose actual thickness deviates from the theoretical thickness within a preset battery cell thickness deviation range, stacking the battery cells and the flexible boards to form a battery module, and then clamping the battery modules into a box includes:

[0035] Determining a clamping force range for the battery module based on the elastic coefficient of the flexible plate, the total number and initial thickness of the flexible plates, and the total thickness range of the compressed flexible plates required for the battery module;

[0036] The battery module formed by stacking the battery cells and the flexible board is clamped into the box according to the determined clamping force range of the battery module.

[0037] In some embodiments, determining the clamping force range of the battery module based on the elastic modulus of the flexible sheet, determining the total number and initial thickness of the flexible sheet, and the total thickness range of the compressed flexible sheet required for the battery module includes:

[0038] The clamping force range corresponding to the battery module is calculated according to the following formula:

[0039]

[0040] Where k is the elastic coefficient of the flexible plate, F min is the minimum clamping force corresponding to the battery module, F max is the maximum clamping force corresponding to the battery module.

[0041] In some embodiments, the flexible board is a foam board.

[0042] The beneficial effects brought about by the technical solution provided by the present invention include:

[0043] An embodiment of the present invention provides a method for stacking battery cells into a box, comprising: determining the total number of cells required to form a battery module and the internal width of the box according to the power value of the battery module and the theoretical thickness of the cells; determining the total number of flexible boards required for the battery module and the initial thickness of each flexible board according to the internal width of the box, the total number of cells required for the battery module and a preset cell thickness deviation range; obtaining the actual thickness of each cell; calculating the deviation between the actual thickness of each cell and the theoretical thickness of the cell; selecting the flexible board with the determined total number and initial thickness; and selecting the flexible board with the determined total number and actual thickness. For battery cells whose deviation from theoretical thickness is within the preset battery cell thickness deviation range, the battery cells and flexible plates are stacked together to form a battery module and then clamped into the box. Battery cells with similar thickness deviations are stacked together within the preset battery cell thickness deviation range, and flexible plates of appropriate thickness are selected for combined pasting, which reduces the size deviation between battery cells and makes the compression amount of multiple battery cells close. The clamping force of the clamping tooling equipment matches the battery cell size, avoiding excessive or insufficient clamping force, reducing the difficulty of battery cell boxing, improving the efficiency and quality of battery cell boxing, and ensuring the reliability, durability and safety of the power battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0045] Figure 1 A flowchart of a method for stacking battery cells into a box provided by an embodiment of the present invention;

[0046] Figure 2 A schematic diagram of the operation of a method for stacking battery cells into a box provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0047] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0048] An embodiment of the present invention provides a method for stacking battery cells into boxes, which can solve the technical problem in the related art that the clamping force of existing clamping tooling equipment does not match the battery cells. If the clamping force is too large, the battery cells will be damaged. If the clamping force is insufficient, gaps will exist, which reduces the efficiency and quality of battery cell boxing.

[0049] Figure 1 This is a flowchart of a method for stacking battery cells into a box provided by an embodiment of the present invention, comprising the following steps:

[0050] Step S10 , determining the total number of battery cells required to form the battery module and the inner width of the box body according to the power value of the battery module and the theoretical thickness of the battery cells.

[0051] As an optional implementation, in one embodiment of the invention, see Figure 1 As shown, the method of determining the total number of battery cells required to form a battery module and the internal width of the box according to the power value of the battery module and the theoretical thickness of the battery cells includes: determining the total number of battery cells required to form a battery module according to the power value of the battery module, and determining the internal width of the box corresponding to the battery module according to the total number of battery cells required to form the battery module and the theoretical thickness of the battery cells.

[0052] Specifically, determining the total number of battery cells required to form the battery module according to the power value of the battery module includes: obtaining the power value Y of the battery module, calculating and determining the total number n of battery cells required to form the battery module according to the power value Y of the battery module, and calculating the total number of battery cells required to form the battery module according to the following formula:

[0053]

[0054] Where n is the total number of battery cells required to form a battery module, Y is the charge value of the battery module, and y is the charge value of each battery cell. If the charge value of the battery module is 900 kWh and the charge value of each battery cell is 30 kWh, the total number of battery cells required to form a battery module is 30.

[0055] Determining the internal width of the box corresponding to the battery module based on the total number of battery cells required to form the battery module and the theoretical thickness of the battery cells includes: obtaining the theoretical thickness of each battery cell, and then calculating the internal width of the box corresponding to the battery module according to the following formula:

[0056] (n+j)·C=X;

[0057] Wherein, j is an integer greater than 1, C is the theoretical thickness of each battery cell, X is the internal width of the box corresponding to the battery module, and 1<j<5. If the theoretical thickness of each battery cell C=30mm, according to the total number of battery cells n=30 required to form the battery module, then the internal width X of the box corresponding to the battery module can be 960mm, 990mm or 1020mm.

[0058] Step S20 , determining the total number of flexible boards required for the battery module and the initial thickness of each flexible board according to the internal width of the box, the total number of battery cells required for the battery module, and a preset battery cell thickness deviation range.

[0059] As an optional implementation, in one embodiment of the invention, see Figure 1 As shown, the total number of flexible boards required for the battery module and the initial thickness of each flexible board are determined based on the internal width of the box, the total number of battery cells required for the battery module, and the preset battery cell thickness deviation range, including: the total number of flexible boards required to form the battery module is one more than the total number of battery cells required to form the battery module; when the total number n of battery cells required for the battery module is 30, the total number of flexible boards required to form the battery module is n+1=31; when the total number n of battery cells required for the battery module is 31, the total number of flexible boards required to form the battery module is n+1=32.

[0060] As an optional implementation, in one embodiment of the invention, see Figure 1 As shown, the method of determining the total number of flexible plates required for the battery module and the initial thickness of each flexible plate according to the internal width of the box, the total number of battery cells required for the battery module and the preset battery cell thickness deviation range also includes: determining the total thickness range of the flexible plates after compression required for the battery module according to the internal width of the box, the total number of battery cells required for the battery module and the preset battery cell thickness deviation range; determining the initial thickness of each flexible plate according to the total thickness range of the flexible plates after compression required for the battery module and the total number of flexible plates required for the battery module.

[0061] Specifically, according to the following formula:

[0062]

[0063] The total thickness range of the compressed flexible plate required for the battery module is calculated, where: is the total thickness of the flexible board after compression required for the battery module, C max The upper limit of the deviation between the theoretical thickness of each cell and the preset cell thickness, C min The lower limit of the deviation between the theoretical thickness of each battery cell and the preset battery cell thickness. If the overall width of the box is 1000mm, the internal width of the box is X = 1000-5-5 = 990mm. The internal width of the box needs to subtract the thickness of the end plates on both sides. The total number of battery cells required for the battery module is n = 30. The preset battery cell thickness deviation range is ±0.5mm. The preset battery cell thickness deviation range is -0.5mm to 0mm and the theoretical thickness of each battery cell is C = 30mm. The upper limit of the deviation between the theoretical thickness of each battery cell and the preset battery cell thickness is C max =30-0=30mm, the lower limit of the deviation between the theoretical thickness of each battery cell and the preset battery cell thickness is C min =30-0.5=29.5mm, then we get the following formula:

[0064]

[0065] The total thickness of the flexible board required for the battery module after compression ranges from 90 mm to 105 mm.

[0066] As an optional implementation, in one embodiment of the invention, see Figure 1 As shown, the method of determining the initial thickness of each flexible plate according to the total thickness range of the flexible plate after compression required by the battery module and the total number of flexible plates required by the battery module includes:

[0067] The initial thickness of each flexible board is calculated according to the following formula:

[0068]

[0069] Where P' is the initial thickness of each flexible board, C max The upper limit of the deviation between the theoretical thickness of each cell and the preset cell thickness is C. If the preset cell thickness deviation range is ±0.5mm, the preset cell thickness deviation range is -0.5mm to 0mm and the theoretical thickness of each cell is C = 30mm. The upper limit of the deviation between the theoretical thickness of each cell and the preset cell thickness is C. max =30-0=30mm;

[0070] but

[0071] The calculated initial thickness range of each flexible board is 2.9 mm < P' < 6 mm, which can be selected according to actual usage.

[0072] Step S30, obtain the actual thickness of each battery cell, calculate the deviation between the actual thickness of each battery cell and the theoretical thickness of the battery cell, and stack the battery cells and flexible boards to form a battery module and then clamp it into the box.

[0073] Step S40: Select flexible boards with a determined total number and initial thickness, select battery cells with a determined total number and a deviation between the actual thickness and the theoretical thickness within a preset battery cell thickness deviation range, stack the battery cells and flexible boards to form a battery module, and then clamp them into a box.

[0074] As an optional implementation, in one embodiment of the invention, see Figure 1 and Figure 2 As shown, the flexible plates with a determined total number and initial thickness are selected, the battery cells with a determined total number and a deviation between the actual thickness and the theoretical thickness within a preset battery cell thickness deviation range are selected, the battery cells and the flexible plates are stacked together to form a battery module and then clamped into a box, including: determining the clamping force range of the battery module according to the elastic coefficient of the flexible plate, the determined total number and initial thickness of the flexible plate, and the total thickness range of the compressed flexible plate required for the battery module; and clamping the battery module formed by the stacking of the battery cells and the flexible plates into a box according to the determined clamping force range of the battery module.

[0075] Specifically, the clamping force range of the battery module is calculated according to the following formula:

[0076]

[0077] Where k is the elastic coefficient of the flexible plate, F min is the minimum clamping force corresponding to the battery module, F max is the maximum clamping force corresponding to the battery module. If the total number of cells n required for the battery module is 30, the total number of flexible boards required for the battery module is n+1=31. If the total thickness of the flexible boards required for the battery module after compression is calculated to be in the range of 90 mm to 105 mm, and the initial thickness range of each flexible board is calculated to be 2.9 mm < P' < 6 mm, and the theoretical thickness of the flexible board required for the battery module is selected as 4 mm, the following formula is obtained:

[0078] F max = k·((30+1)·4-90)=34k;

[0079] F min =k·((30+1)·4-105)=19k;

[0080] The clamping force range of the battery module is 19k~34k, see Figure 2As shown, the battery module formed by the stacking of battery cells and flexible boards is clamped into the box according to the determined clamping force range of the battery module of 19k~34k. The battery cells with similar thickness deviations are stacked by presetting the battery cell thickness deviation range, and flexible boards of appropriate thickness are selected for combined pasting, which reduces the size deviation between the battery cells and makes the compression amount of multiple battery cells close. The clamping force of the clamping tooling equipment matches the battery cell size, avoiding excessive or insufficient clamping force, reducing the difficulty of battery cell boxing, improving the efficiency and quality of battery cell boxing, and ensuring the reliability, durability and safety of the power battery.

[0081] As an optional implementation, in one embodiment of the invention, see Figure 2 As shown, the flexible board is a foam board, and the 30 battery cells are arranged together in the required order according to the total number of battery cells required by the battery module n=30. In addition, after the total number of battery cells required by the battery module is determined, the 30 battery cells need to be connected in series or parallel according to the power value of the battery module and the layout requirements of the entire package, so that the power of the battery module meets the usage requirements; and an elastic foam board is used to separate two adjacent battery cells and adhere to the battery cells. 30 battery cells and 31 foam boards are combined and adhered to form a battery module. The total thickness of the 30 battery cells and 31 uncompressed foam boards is greater than the overall width of the box, and the total thickness of the 30 battery cells and 31 compressed foam boards is less than the overall width of the box. The battery module formed by the combination is clamped into the box according to the determined clamping force range of the battery module of 19k~34k. There are a large number of tiny, closed bubble structures inside the foam board. When these bubbles are impacted by external force, they can absorb and disperse energy through their own compression deformation, thereby allowing the battery module to be smoothly placed in the box.

[0082] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper" and "lower" is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be internal communication between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0083] It should be noted that, in the present invention, relational terms such as "first" and "second" are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprising a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element.

[0084] The foregoing description is intended only to provide specific embodiments of the present invention, which will enable those skilled in the art to understand and implement the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not intended to be limited to the embodiments shown herein, but is to be construed in the widest possible manner consistent with the principles and novel features of the present invention.

Claims

1. A method for stacking battery cells into a box, characterized in that: include: Step S10, determining the total number of battery cells required to form the battery module and the internal width of the box according to the power value of the battery module and the theoretical thickness of the battery cells; Step S20, determining the total number of flexible boards required for the battery module and the initial thickness of each flexible board based on the internal width of the box, the total number of battery cells required for the battery module, and a preset battery cell thickness deviation range; Step S30, obtaining the actual thickness of each battery cell, and calculating the deviation between the actual thickness of each battery cell and the theoretical thickness of the battery cell; Step S40: Select flexible boards with a determined total number and initial thickness, select battery cells with a determined total number and a deviation between the actual thickness and the theoretical thickness within a preset battery cell thickness deviation range, stack the battery cells and flexible boards to form a battery module, and then clamp them into a box.

2. The method for stacking battery cells into a box according to claim 1, characterized in that: The method of determining the total number of battery cells required to form the battery module and the inner width of the box body according to the power value of the battery module and the theoretical thickness of the battery cells includes: Determining the total number of battery cells required to form the battery module based on the power value of the battery module; The internal width of the box corresponding to the battery module is determined based on the total number of battery cells required to form the battery module and the theoretical thickness of the battery cells.

3. The method for stacking battery cells into a box according to claim 2, characterized in that: The method of determining the total number of battery cells required to form the battery module according to the power value of the battery module, and determining the inner width of the box corresponding to the battery module according to the total number of battery cells required to form the battery module and the theoretical thickness of the battery cells, includes: The total number of cells required to form a battery module is calculated according to the following formula: Where n is the total number of cells required to form a battery module, Y is the charge value of the battery module, and y is the charge value of each cell; Then calculate the internal width of the box corresponding to the battery module according to the following formula: (n+j)·C=X; Wherein, j is an integer greater than 1, C is the theoretical thickness of each battery cell, and X is the internal width of the box corresponding to the battery module.

4. The method for stacking battery cells into a box according to claim 3, characterized in that: The method of determining the total number of flexible plates required for the battery module and the initial thickness of each flexible plate according to the internal width of the box, the total number of battery cells required for the battery module, and the preset battery cell thickness deviation range includes: The total number of flexible boards required to form the battery module is one more than the total number of battery cells required to form the battery module.

5. The method for stacking battery cells into a box according to claim 4, characterized in that: The method of determining the total number of flexible plates required for the battery module and the initial thickness of each flexible plate according to the internal width of the box, the total number of battery cells required for the battery module, and the preset battery cell thickness deviation range further includes: Determine the total thickness range of the compressed flexible plate required for the battery module based on the internal width of the box, the total number of battery cells required for the battery module, and the preset battery cell thickness deviation range; The initial thickness of each flexible plate is determined based on the total thickness range of the flexible plates after compression required for the battery module and the total number of flexible plates required for the battery module.

6. The method for stacking battery cells into a box according to claim 5, characterized in that: The method of determining the total thickness range of the compressed flexible plate required for the battery module based on the internal width of the box, the total number of battery cells required for the battery module, and the preset battery cell thickness deviation range includes: The total thickness range of the compressed flexible plate required for the battery module is calculated according to the following formula: in, is the total thickness of the flexible board after compression required for the battery module, C max The upper limit of the deviation between the theoretical thickness of each cell and the preset cell thickness, C min The lower limit of the deviation between the theoretical thickness of each battery cell and the preset battery cell thickness.

7. The method for stacking battery cells into a box according to claim 6, characterized in that: The method of determining the initial thickness of each flexible plate according to the total thickness range of the flexible plates after compression required by the battery module and the total number of flexible plates required by the battery module includes: The initial thickness of each flexible board is calculated according to the following formula: Where P' is the initial thickness of each flexible board, C max The upper limit of the deviation between the theoretical thickness of each battery cell and the preset battery cell thickness.

8. The method for stacking battery cells into a box according to claim 7, characterized in that: The method comprises selecting a determined total number and initial thickness of flexible boards, selecting a determined total number of battery cells whose actual thickness deviates from the theoretical thickness within a preset battery cell thickness deviation range, stacking the battery cells and the flexible boards to form a battery module, and then clamping the battery modules into a box, including: Determining a clamping force range for the battery module based on the elastic coefficient of the flexible plate, the total number and initial thickness of the flexible plates, and the total thickness range of the compressed flexible plates required for the battery module; The battery module formed by stacking the battery cells and the flexible board is clamped into the box according to the determined clamping force range of the battery module.

9. The method for stacking battery cells into a box according to claim 8, characterized in that: Determining the clamping force range of the battery module according to the elastic coefficient of the flexible plate, determining the total number and initial thickness of the flexible plates, and the total thickness range of the compressed flexible plates required for the battery module includes: The clamping force range corresponding to the battery module is calculated according to the following formula: Where k is the elastic coefficient of the flexible plate, F min is the minimum clamping force corresponding to the battery module, F max is the maximum clamping force corresponding to the battery module.

10. The method for stacking battery cells into a box according to claim 1, characterized in that: The flexible board is a foam board.

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