Soft package battery, battery module structure and assembling method thereof

Abstract

The invention provides a soft package battery, a battery module structure and an assembling method of the battery module structure. The battery module structure comprises a battery cell and a protection plate assembly, the battery cell is provided with a top sealing groove, and a tab of the battery cell is formed on one side edge of the top sealing groove; the protection plate assembly comprises a battery cell protection plate and a top sealing filling piece, the battery cell protection plate is located in the top sealing groove, the battery cell protection plate is provided with a tab extension area, and a tab of the battery cell is located in the tab extension area; and the top sealing groove is filled with the top sealing filling piece, and the top sealing filling piece abuts against the battery cell protection plate. The top sealing groove is filled with the top sealing filling piece, so that a gap between the battery cell protection plate and the top of the battery cell is eliminated, the space in the top sealing groove of the battery cell is filled, the height difference formed by the top sealing groove is eliminated, the matched contact area with the inner cavity of the shell during assembly is increased, and the installation firmness is improved; and the top sealing filling piece supports and fixes the battery cell protection plate without additionally arranging a bracket for positioning, so that the production cost is effectively reduced.

Description

Technical Field

[0001] This disclosure relates to the field of battery technology, and in particular to a pouch battery, a battery module structure, and an assembly method thereof. Background Technology

[0002] Currently, lithium-ion power battery modules are a core component of electric vehicles, and the stability and reliability of their structure directly affect the performance and lifespan of the entire battery system. Due to their unique aluminum-plastic film encapsulation structure, pouch cells offer superior safety and high energy density, leading to their increasing market share in the power battery industry.

[0003] Traditional pouch cell structures have a top sealing area, namely two top sealing slots, at the tab lead-out position. These top sealing slots serve as mounting slots for the cell protection board. There are two main methods for mounting the cell protection board: 1. When manufacturing battery packs from single cells, the cell protection board is typically placed flat in the top sealing groove. The protection board is laser-welded to the cell, and the area where it is placed is smaller than the thickness of the cell itself. There is a height difference between the upper surface of the protection board and the upper surface of the cell. Figure 1 As shown. However, after the battery pack is installed inside the casing of the electrical equipment, the contact area between the battery pack's side cell protection plate area and the inner cavity of the casing is small, which may lead to loosening and instability.

[0004] 2. The cell protection board is positioned using a plastic casing or bracket. It is then vertically placed and fixed above the top sealing area of ​​the cell. Figure 2 As shown, the battery pack forms a rectangular structure, which leads to disadvantages such as complex manufacturing process, high cost, and the plastic casing taking up more space. Summary of the Invention

[0005] The purpose of this disclosure is to overcome the shortcomings of the prior art and provide a soft-pack battery, battery module structure and assembly method thereof that improves installation stability and reduces production costs.

[0006] The purpose of this disclosure is achieved through the following technical solution: A battery module structure includes: a battery cell and a protection board assembly; the battery cell has a top sealing groove, and a tab of the battery cell is formed on one side of the top sealing groove; the protection board assembly includes a battery cell protection board and a top sealing filler, the battery cell protection board is located in the top sealing groove, the battery cell protection board has a tab extension area, and the tab of the battery cell is located in the tab extension area so that the tab of the battery cell corresponds to the welding area of ​​the battery cell protection board; the top sealing filler fills the top sealing groove, and the top sealing filler abuts against the battery cell protection board to support the battery cell protection board.

[0007] In one embodiment, there are two top sealing slots, which are symmetrically arranged, and the electrode of the battery cell is located between the two top sealing slots.

[0008] In one embodiment, the number of top seal fillers is two, and each top seal filler fills one top seal groove.

[0009] In one embodiment, the cell protection board has a tab through-hole, the tab through-hole is located in the tab extension area, and the tab of the cell passes through the tab through-hole.

[0010] In one embodiment, the cell protection board includes interconnected plates and soldered nickel sheets. The plates are perpendicular to the tabs of the cell, and the soldered nickel sheets are located within the soldering area of ​​the plates and adjacent to the tab extension area.

[0011] In one embodiment, the cell protection board further includes an FPC board, which is electrically connected to the board body and is disposed around the sidewall of the cell.

[0012] In one embodiment, the protective plate assembly further includes protective adhesive paper covering the plate body.

[0013] In one embodiment, the protection board assembly further includes a bottom adhesive strip connected to the battery cell, the bottom adhesive strip being located at the end of the battery cell opposite to the protective adhesive strip.

[0014] In one embodiment, the protection board assembly further includes an insulating protective element located on the side of the cell protection board opposite to the top seal filler.

[0015] In one embodiment, the protection plate assembly further includes a label that is fitted onto the outer wall of the battery cell.

[0016] A pouch battery, comprising the battery module structure described in any of the above embodiments.

[0017] A battery module structure assembly method is provided for assembling the battery module structure described in any of the above embodiments. The battery module structure assembly method includes the following steps: Provide battery cells; The top sealing filler is attached into the top sealing groove of the battery cell; Insert the battery cell's tabs into the tab extension area of ​​the battery cell protection board so that the battery cell's tabs align with the soldering area of ​​the battery cell protection board. Weld the tabs of the battery cell from the side where the welding area of ​​the battery cell protection board is located; The welded tabs are bent upside down and placed on the cell protection plate to obtain the battery module structure.

[0018] Compared with the prior art, this disclosure has at least the following advantages: The top sealing filler eliminates the gap between the cell protection board and the top of the cell by filling the top sealing groove, thereby filling the space inside the top sealing groove of the cell and eliminating the height difference formed by the top sealing groove. This increases the contact area with the inner cavity of the outer casing during assembly, thereby improving the installation firmness. Moreover, the top sealing filler supports and fixes the cell protection board without the need for additional brackets for positioning, effectively reducing production costs. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this disclosure, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this disclosure and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of a battery module structure with a cell protection board in the prior art; Figure 2 This is a schematic diagram of a battery module structure with a cell protection board, which is another prior art technology. Figure 3 This is a schematic diagram of the battery module structure in one embodiment; Figure 4 for Figure 3 An exploded view of the battery module structure shown. Figure 5 for Figure 3 The enlarged schematic diagram of the battery module structure shown at point A1; Figure 6 This is a schematic diagram of the battery module structure in another embodiment; Figure 7 This is a flowchart of a battery module structure assembly method in one embodiment. Detailed Implementation

[0021] To facilitate understanding of this disclosure, a more complete description will be given below with reference to the accompanying drawings, which illustrate preferred embodiments of the present disclosure. However, this disclosure can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure.

[0022] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this disclosure. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0024] This disclosure relates to a battery module structure. In one embodiment, the battery module structure includes a battery cell and a protection board assembly; the battery cell has a top sealing groove, and a tab of the battery cell is formed on one side of the top sealing groove; the protection board assembly includes a battery cell protection board and a top sealing filler, the battery cell protection board is located in the top sealing groove, the battery cell protection board has a tab extension area, and the tab of the battery cell is located in the tab extension area so that the tab of the battery cell corresponds to the welding area of ​​the battery cell protection board; the top sealing filler fills the top sealing groove, and the top sealing filler abuts against the battery cell protection board to support the battery cell protection board. The top sealing filler eliminates the gap between the cell protection board and the top of the cell by filling the top sealing groove, thereby filling the space inside the top sealing groove of the cell and eliminating the height difference formed by the top sealing groove. This increases the contact area with the inner cavity of the outer casing during assembly, thereby improving the installation firmness. Moreover, the top sealing filler supports and fixes the cell protection board without the need for additional brackets for positioning, effectively reducing production costs.

[0025] Please see Figure 3 This is a schematic diagram of the structure of a battery module according to an embodiment of the present disclosure.

[0026] One embodiment of the battery module structure 10 includes a battery cell 100 and a protection board assembly 200. Please refer to the following: Figure 4 and 5The battery cell 100 has a top sealing groove 102, and a tab of the battery cell 100 is formed on one side of the top sealing groove 102. The protection board assembly 200 includes a battery cell protection board 210 and a top sealing filler 220. The battery cell protection board 210 is located within the top sealing groove 102 and has a tab extension area. The tab of the battery cell 100 is located within the tab extension area so that the tab of the battery cell 100 corresponds to the welding area of ​​the battery cell protection board 210. The top sealing filler 220 fills the top sealing groove 102 and abuts against the battery cell protection board 210 to support the battery cell protection board 210.

[0027] In this embodiment, the top sealing filler 220 fills the top sealing groove 102, thereby eliminating the gap between the top of the cell protection plate 210 and the top of the cell 100. This fills the space inside the top sealing groove 102 of the cell 100, eliminating the height difference formed by the top sealing groove 102. This increases the contact area with the inner cavity of the outer casing during assembly, thereby improving the installation firmness. Moreover, the top sealing filler 220 supports and fixes the cell protection plate 210 without the need for additional bracket positioning, effectively reducing production costs.

[0028] In one embodiment, there are two top sealing slots 102, which are symmetrically arranged, with the tabs of the battery cell 100 located between the two top sealing slots 102. In this embodiment, the two top sealing slots 102 are located on both sides of the tabs of the battery cell 100, that is, the two top sealing slots 102 are symmetrically arranged with the tabs of the battery cell 100 as the central axis. The space formed in the top sealing slot 102 is used to place the top sealing filler 220, which facilitates the top sealing filler 220 to clamp the tabs of the battery cell 100, ensuring the vertical extension of the tabs of the battery cell 100, and facilitating subsequent laser welding of the tabs of the battery cell 100.

[0029] Furthermore, there are two top sealing fillers 220, each of which fills one top sealing groove 102. In this embodiment, the top sealing fillers 220 and the top sealing grooves 102 correspond one-to-one, that is, each top sealing groove 102 is filled by one top sealing filler 220. Specifically, the thickness of the top sealing filler 220 is greater than or equal to the groove depth of the top sealing groove 102, so that the surface of the battery cell 100 remains flush with the top sealing groove 102, and each surface of the battery cell 100 forms a plane. This results in more contact points between the battery module structure and the inner cavity of the outer casing after the battery module structure is installed in the outer casing, further improving the installation firmness of the battery module structure.

[0030] In one embodiment, please refer to Figure 5The cell protection plate 210 has a tab through-hole 202 located within the tab extension area, and the tab of the cell 100 passes through the tab through-hole 202. In this embodiment, the tab through-hole 202 is located on the cell protection plate 210, and it penetrates the cell protection plate 210. The tab through-hole 202 corresponds to the tab extension area, and it is used for the tab of the cell 100 to pass through. The welding area of ​​the cell protection plate 210 is located on the top surface of the cell protection plate 210, that is, the welding area is located on the side of the cell protection plate 210 away from the top sealing groove 102. The tab of the cell 100 extends out after passing through the tab through-hole 202, so that the tab of the cell 100 corresponds to the welding area, which facilitates the welding of the tab of the cell 100.

[0031] In another embodiment, the tab extension area is located on the side of the cell protection board. For example, the side of the cell protection board has a tab through slot for the tab of the cell to pass through, that is, the tab of the cell passes through the slot on the side of the cell protection board to facilitate tab welding.

[0032] In one embodiment, please refer to Figure 5 The cell protection board 210 includes an interconnected plate body 212 and a welding nickel sheet 214. The plate body 212 is perpendicular to the tab of the cell 100. The welding nickel sheet 214 is located within the welding area of ​​the plate body 212 and is adjacent to the tab extension area. In this embodiment, the plate body 212 serves as the mounting plate for the welding nickel sheet 214. Protective circuits are distributed on the plate body 212. The welding nickel sheet 214 is located on the side of the plate body 212 facing away from the top sealing groove 102. The welding nickel sheet 214 is also located within the welding area of ​​the plate body 212. After the tab of the cell 100 passes through the tab extension area, the tab of the cell 100 is aligned with the welding nickel sheet 214, facilitating the welding of the tab of the cell 100 to the welding nickel sheet 214.

[0033] In another embodiment, the welding nickel sheet has an "L"-shaped structure. For example, the welding nickel sheet includes a first welding portion and a second welding portion connected to each other. The first welding portion is electrically connected to the welding point of the plate, and the second welding portion is perpendicular to the plate and is used for laser welding to the tab of the battery cell. Thus, during laser welding, the welding claw presses against the side of the battery cell's tab away from the second welding portion, so that the battery cell's tab abuts against the second welding portion. The laser beam during laser welding is directed towards the side of the second welding portion away from the battery cell's tab, so that the laser acts on the second welding portion, avoiding direct laser irradiation on the tab during welding, thereby reducing the probability of damage to the tab during laser welding. Moreover, through the design of the shape and structure of the welding nickel sheet, the welding claw only needs to contact the battery cell's tab, without applying pressure to the plate during welding, avoiding damage to the plate due to compression.

[0034] In one embodiment, please refer to Figure 5 The cell protection board 210 further includes an FPC board 216, which is electrically connected to the board body 212 and is disposed around the side wall of the cell 100. In this embodiment, the FPC board 216 serves as a circuit extension component of the board body 212 to connect the electrical energy of the cell 100 to external electrical equipment. The FPC board 216 is a flexible circuit board. By bending the FPC board 216, it is distributed along the outer side of the cell 100, so that the FPC board 216 adheres to the cell 100, thereby reducing the overall volume of the battery module structure.

[0035] In another embodiment, the length of the FPC board 216 is adjustable, and after bending, the position of the gold fingers on it corresponds to the power connection terminal of the electrical device.

[0036] In another embodiment, please refer to Figure 6The FPC board 216 includes a first FPC sub-board 2162, a second FPC sub-board 2164, a third FPC sub-board 2166, and a power connection plate 2168, which are sequentially bent and connected. The first FPC sub-board 2162 is electrically connected to the board body 212 and is arranged parallel to the board body 212. The second FPC sub-board 2164 is arranged perpendicular to the board body 212 and is bent toward the battery cell. The third FPC sub-board 2166 is perpendicular to both the first FPC sub-board 2162 and the second FPC sub-board 2164. The power connection plate 2168 is arranged parallel to the second FPC sub-board 2164 and is used for electrical connection with the power connection terminal of the electrical equipment. The second FPC sub-board 2164 and the power connection plate 2168 are respectively arranged corresponding to a top sealing filler 220. In this embodiment, the first FPC sub-board 2162 serves as the power output extension board of the board body 212, and the second FPC sub-board 2164, the third FPC sub-board 2166, and the power receiving end plate 2168 serve as winding boards. The progressive bending of the second FPC sub-board 2164, the third FPC sub-board 2166, and the power receiving end plate 2168 restricts the top sealing filler 220 to the center of the FPC board 216. While supplying power to the electrical equipment, it also serves to fix the top sealing filler 220, effectively improving the internal installation stability of the top sealing filler 220.

[0037] In one embodiment, please refer to Figure 4 The protective board assembly 200 further includes a protective adhesive tape 230, which is applied to the board body 212. In this embodiment, the protective adhesive tape 230 is located on the board body 212, covering the top of the board body 212 to prevent it from being exposed, thereby protecting the circuitry and components on the board body 212, such as protecting the tabs of the battery cell 100 and the soldered nickel sheet 214.

[0038] In another embodiment, the protective tape 230 has a "U" shaped structure. The protective tape 230 is fastened to the plate 212 and also covers the top sealing filler 220, so as to provide all-round protection for the battery cell protection board 210 and the top sealing filler 220.

[0039] In one embodiment, please refer to Figure 4The protection board assembly 200 further includes a bottom adhesive tape 240 connected to the battery cell 100, the bottom adhesive tape 240 being located at the end of the battery cell 100 opposite to the protective adhesive tape 230. In this embodiment, the bottom adhesive tape 240 is located at the bottom of the battery cell 100, and the bottom adhesive tape 240 protects the bottom of the battery cell 100 to prevent damage to the bottom of the battery cell 100.

[0040] In one embodiment, please refer to Figure 4 The protection board assembly 200 further includes an insulating protective element 250, which is located on the side of the cell protection board 210 facing away from the top sealing filler 220. In this embodiment, the insulating protective element 250 is located above the cell protection board 210, and it provides insulation protection for the cell protection board 210 to avoid electromagnetic pulse interference to the cell protection board 210.

[0041] In another embodiment, the protective adhesive tape 230 is located between the insulating protective component 250 and the cell protection board 210, thereby providing multiple layers of protection for the cell protection board 210, including waterproofing, dustproofing, and insulation.

[0042] In another embodiment, the insulating protective component has a clearance hole. Specifically, the insulating protective component has an "L"-shaped structure. The clearance hole is used to lock the positioning post of the electrical equipment, so that the insulating protective component can not only provide insulation protection, but also be positioned and connected through the clearance hole to improve installation stability.

[0043] In one embodiment, please refer to Figure 4 The protective plate assembly 200 further includes a label 260, which is sleeved on the outer wall of the battery cell 100. In this embodiment, the label 260 serves as packaging for the battery cell 100, displaying information about the cell. The label 260 wraps around the main body of the battery cell 100, facilitating protection of its outer wall. The label 260, the protective adhesive tape 230, and the bottom adhesive tape 240 provide all-angle protection for the battery cell 100, enhancing its protective capabilities and thus improving its safety in use.

[0044] In another embodiment, the label 260, the protective adhesive tape 230, and the bottom adhesive tape 240 are all waterproof and insulating adhesive tapes to provide waterproof and insulating protection for the battery cell 100.

[0045] In another embodiment, both the insulating protective element 250 and the top sealing filler 220 are foam, which can provide support and insulation.

[0046] In one embodiment, this disclosure also provides a battery module structure assembly method, which is used to assemble the battery module structure described in any of the above embodiments. Please refer to [link to relevant documentation]. Figure 7 The battery module assembly method includes the following steps: S100: Provides 100 battery cells; S200: The top sealing filler 220 is attached into the top sealing groove 102 of the cell 100; S300: Insert the tab of the battery cell 100 into the tab extension area of ​​the battery cell protection board 210 so that the tab of the battery cell 100 is aligned with the welding area of ​​the battery cell protection board 210. S400: Weld the tabs of the battery cell 100 from the side where the welding area of ​​the battery cell protection board 210 is located; S500: The welded tabs are bent and inverted onto the cell protection board 210 to obtain the battery module structure.

[0047] In this embodiment, the top sealing filler 220 fills the top sealing groove 102 to reduce the gap appearing on the top of the battery cell 100. The tabs of the battery cell 100 extend through the tab extension area of ​​the battery cell protection plate 210, so that the tabs of the battery cell 100 extend to a position aligned with the welding area of ​​the battery cell protection plate 210, which facilitates the alignment of the tabs of the battery cell 100 with the welding area of ​​the battery cell protection plate 210, thereby facilitating welding. During welding, the tabs of the battery cell 100 are bent and flat against the battery cell protection plate 210, reducing the space occupied by the tabs and realizing the miniaturization of the battery module structure.

[0048] In another embodiment, the tab passes through the tab through-hole 202 in the tab extension area and is aligned with the welding nickel sheet 214 in the welding area to facilitate laser welding of the tab and the welding nickel sheet 214. The laser irradiation surface of the laser welding is located on the welding nickel sheet 214, and the welding claws press the tab to fit it against the welding nickel sheet 214 to ensure stable contact between the tab and the welding nickel sheet 214 during welding, thereby improving welding reliability.

[0049] In another embodiment, after the electrode tab and the welding nickel sheet 214 are welded together, the welded portion of the welding nickel sheet 214 and the electrode tab is bent, that is, the welding area of ​​the welding nickel sheet 214 is bent synchronously with the electrode tab, so that the welding nickel sheet 214 and the electrode tab are parallel to the cell protection board 210, thus avoiding excessive space occupation.

[0050] In another embodiment, the welded electrode tab is bent upside down and placed on the cell protection board 210, and then the process further includes: Cover the cell protection board 210 with protective tape 230; The insulating protective component 250 is attached to the side of the protective tape 230 that is away from the cell protection board 210; Apply tag 260 to battery cell 100; The bottom adhesive tape 240 is attached to the bottom of the battery cell 100.

[0051] In one embodiment, this disclosure also provides a pouch battery, including the battery module structure described in any of the above embodiments. In this embodiment, the battery module structure includes a cell and a protection board assembly; the cell has a top sealing groove, and a tab of the cell is formed on one side of the top sealing groove; the protection board assembly includes a cell protection board and a top sealing filler, the cell protection board is located in the top sealing groove, the cell protection board has a tab extension area, and the tab of the cell is located in the tab extension area so that the tab of the cell corresponds to the welding area of ​​the cell protection board; the top sealing filler fills the top sealing groove, and the top sealing filler abuts against the cell protection board to support the cell protection board. The top sealing filler eliminates the gap between the cell protection board and the top of the cell by filling the top sealing groove, thereby filling the space inside the top sealing groove of the cell and eliminating the height difference formed by the top sealing groove. This increases the contact area with the inner cavity of the outer casing during assembly, thereby improving the installation firmness. Moreover, the top sealing filler supports and fixes the cell protection board without the need for additional brackets for positioning, effectively reducing production costs.

[0052] The embodiments described above are merely illustrative of several implementations of this disclosure, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this disclosure, and these all fall within the protection scope of this disclosure. Therefore, the protection scope of this patent should be determined by the appended claims.

Claims

1. A battery module structure (10), characterized in that, include: A battery cell (100) has a top sealing groove (102) and a tab of the battery cell (100) is formed on one side of the top sealing groove (102); A protection board assembly (200) includes a cell protection board (210) and a top sealing filler (220). The cell protection board (210) is located in the top sealing groove (102). The cell protection board (210) has a tab extension area. The tab of the cell (100) is located in the tab extension area so that the tab of the cell (100) corresponds to the welding area of ​​the cell protection board (210). The top sealing filler (220) fills the top sealing groove (102) and abuts against the cell protection board (210) to support the cell protection board (210).

2. The battery module structure (10) according to claim 1, characterized in that, There are two top sealing slots (102), and the two top sealing slots (102) are symmetrically arranged. The electrode tab of the battery cell (100) is located between the two top sealing slots (102).

3. The battery module structure (10) according to claim 2, characterized in that, The number of the top sealing filler (220) is two, and each of the top sealing fillers (220) fills one of the top sealing grooves (102).

4. The battery module structure (10) according to claim 1, characterized in that, The battery cell protection board (210) has a tab through hole (202), the tab through hole (202) is located in the tab extension area, and the tab of the battery cell (100) is inserted through the tab through hole (202).

5. The battery module structure (10) according to claim 1, characterized in that, The cell protection board (210) includes interconnected plates (212) and welding nickel sheets (214). The plates (212) are perpendicular to the tabs of the cell (100). The welding nickel sheets (214) are located in the welding area of ​​the plates (212) and are adjacent to the tab extension area.

6. The battery module structure (10) according to claim 5, characterized in that, The cell protection board (210) also includes an FPC board (216), which is electrically connected to the board body (212) and is arranged around the side wall of the cell (100).

7. The battery module structure (10) according to claim 6, characterized in that, The protective plate assembly (200) also includes protective adhesive paper (230), which is applied to the plate body (212); And / or, the protection board assembly (200) further includes a bottom adhesive tape (240) connected to the battery cell (100), the bottom adhesive tape (240) being located at one end of the battery cell (100) away from the protective adhesive tape (230).

8. The battery module structure (10) according to claim 1, characterized in that, The protection board assembly (200) further includes an insulating protective element (250) located on the side of the cell protection board (210) opposite to the top seal filler (220); And / or, the protection board assembly (200) further includes a tag (260) which is sleeved on the outer wall of the battery cell (100).

9. A soft-pack battery, characterized in that, Includes the battery module structure (10) as described in any one of claims 1 to 8.

10. A method for assembling a battery module structure, characterized in that, The battery module assembly method for obtaining the battery module structure (10) as described in any one of claims 1 to 8 includes the following steps: Provide battery cells (100); The top sealing filler (220) is attached into the top sealing groove (102) of the cell (100); Insert the tabs of the battery cell (100) into the tab extension area of ​​the battery cell protection board (210) so that the tabs of the battery cell (100) are aligned with the welding area of ​​the battery cell protection board (210); The tabs of the battery cell (100) are welded from the side where the welding area of ​​the battery cell protection board (210) is located; The welded tabs are bent upside down and placed on the cell protection board (210) to obtain the battery module structure (10).

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