Top cover assembly, battery cell, battery pack and vehicle

Abstract

The utility model relates to a top cover assembly, a battery cell, a battery pack and a vehicle, the top cover assembly comprises a cover plate and lower plastic cement which are stacked, an insulating layer is further arranged between the cover plate and the lower plastic cement, and the projection of the insulating layer on the surface of the cover plate covers the projection of the lower plastic cement on the surface of the cover plate. The battery cell is arranged in an inverted mode, the endurance capability of the whole vehicle can be improved, due to the arrangement of the insulating layer of the top cover assembly, the situation of short circuit caused by lap joint of the naked battery cell of the battery cell and the cover plate of the top cover assembly can be avoided, and the service life and the stability of the battery cell are guaranteed.

Description

Technical Field

[0001] This application relates to the field of vehicle technology, specifically to a roof assembly, a battery cell, a battery pack, and a vehicle. Background Technology

[0002] The battery cell includes a top cover assembly, a housing, and bare battery cells. The top cover assembly is fixed to the opening of the housing and forms a mounting cavity for installing the bare battery cells. The top cover assembly includes a cover plate and a lower plastic layer. The lower plastic layer provides insulation between the cover plate and the bare battery cells. The cover plate and the housing are circumferentially sealed and welded together. Therefore, the circumferential edge of the cover plate extends outward beyond the edge of the lower plastic layer.

[0003] The inverted arrangement of battery cells in a battery pack can increase the utilization of vertical space and volumetric energy density, thereby improving the vehicle's range. However, according to the existing cell structure, when the cells are inverted, the bare cells are supported on the lower plastic due to their own weight. Compared to placing the bare cells upright, the supporting area of ​​the inverted bare cells is smaller. After vibration or other impacts, the electrode sheets of the bare cells may break and shed powder, and the active material may fall into the top cover assembly. This could lead to the bare cells overlapping with the cover plate of the top cover assembly, resulting in a risk of short circuit. Furthermore, during the manufacturing process, residual metal particles inside the bare cells (such as metal particles generated during laser welding, metal particles generated during electrode die-cutting, etc.) may fall to one side of the top cover assembly when the cells are inverted, creating a risk of short circuit between the bare cells and the cover plate.

[0004] Therefore, for battery packs with inverted cells, how to avoid short circuits caused by contact between bare cells and the top cover assembly, and how to ensure cell stability and extend cell lifespan, are technical problems that urgently need to be solved by those skilled in the art. Utility Model Content

[0005] The purpose of this application is to provide a top cover assembly, a battery cell, a battery pack, and a vehicle that can arrange the battery cells in an inverted manner to improve the overall vehicle range while avoiding short circuits caused by the bare battery cells overlapping with the top cover assembly, thus ensuring the service life and stability of the battery cells.

[0006] To solve the above-mentioned technical problems, this application provides a top cover assembly, including a cover plate and a lower plastic layer stacked together, wherein an insulating layer is further provided between the cover plate and the lower plastic layer, and the projection of the insulating layer on the surface of the cover plate covers the projection of the lower plastic layer on the surface of the cover plate.

[0007] Optionally, the insulating layer includes a sprayed coating on the side surface of the cover plate facing the lower plastic.

[0008] Optionally, the material of the coating layer includes at least one of mica, ceramic, quartz, glass fiber, epoxy resin and phenolic resin.

[0009] Optionally, the thickness of the sprayed coating is 1μm-50μm.

[0010] Optionally, the insulating layer includes a first insulating film, the circumferential edge of which extends outward from the circumferential edge of the lower plastic and forms an extension.

[0011] Optionally, the width of the extension is not less than 0.5 mm; and / or, the thickness of the first insulating film is 50 μm - 150 μm.

[0012] Optionally, the cover plate is further provided with an explosion-proof valve, and the first insulating film is further provided with an explosion-proof zone corresponding to the explosion-proof valve, and the explosion-proof zone is further provided with annular grooves along the circumference.

[0013] This application also provides a battery cell, including a housing, a bare battery cell, and a top cover assembly as described above; the top of the housing is provided with an opening, and the cover plate of the top cover assembly covers the opening and surrounds the housing to form a mounting cavity, wherein the lower plastic and the bare battery cell are both located within the mounting cavity.

[0014] This application also provides a battery cell, including a housing, a bare battery cell, and a top cover assembly as described above; the housing has an opening, and the cover plate of the top cover assembly covers the opening and surrounds the housing to form a mounting cavity, the lower plastic and the bare battery cell are both located in the mounting cavity; the side wall of the bare battery cell away from the top cover assembly and the peripheral side wall of the bare battery cell are also wrapped with a second insulating film, the side portion of the lower plastic facing the cover plate is provided with a flange structure in the circumferential direction, the flange structure is formed by an extension of the first insulating film, and the side portion of the second insulating film facing the top cover assembly overlaps and is fixed with the flange structure in the circumferential direction.

[0015] This application also provides a battery pack including the cells described above.

[0016] This application also provides a vehicle including the battery pack described above.

[0017] The top cover assembly, battery cell, battery pack, and vehicle provided in this application have the following technical advantages compared to the prior art:

[0018] By placing an insulating layer between the cover plate and the lower plastic layer, and ensuring that the projection of the insulating layer on the surface of the cover plate covers the projection of the lower plastic layer on the surface of the cover plate, a larger insulating protection area is formed between the cover plate and the bare cell. With this design, in a battery pack with inverted cells, if the electrode of a bare cell is damaged and powder falls off, causing active material to detach and fall onto the surface of the cover plate, or if residual metal particles from the bare cell fall onto the surface of the cover plate during manufacturing, the insulating layer prevents the active material and metal particles from directly contacting the cover plate. This avoids short circuits caused by conductive contact between the active material and metal particles, ensuring insulation between the bare cell and the cover plate and improving safety.

[0019] Furthermore, because the insulation layer increases the area of ​​insulation protection, it can also prevent the bare cell's tabs from being redundant and passing through the gap between the lower plastic and the shell, thus avoiding a short circuit caused by overlapping with the cover plate, thereby ensuring safety.

[0020] The insulation layer also isolates the electrolyte from the explosion-proof valve, reducing the probability of electrolyte corrosion and leakage from the explosion-proof valve, thereby reducing the probability of insulation failure of the battery pack and improving safety. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the first embodiment of the top cover assembly provided in this application;

[0022] Figure 2 This is a schematic diagram of the structure of a second embodiment of the top cover assembly provided in this application;

[0023] Figure 3 yes Figure 2 Exploded view;

[0024] Figure 4 yes Figure 2 Top view of the middle insulation layer and the lower plastic layer;

[0025] Figure 5 yes Figure 2 A schematic diagram of the structure when the extension of the first insulating film forms a flange structure;

[0026] Figure 6 yes Figure 5 The diagram shows the top cover assembly in its assembled state with the bare battery cell.

[0027] Figure 7 This is a schematic diagram of the third embodiment of the top cover assembly provided in this application.

[0028] Appendix Figures 1-7 The reference numerals in the attached figures are explained as follows:

[0029] 1. Cover plate;

[0030] 2. Lower plastic, 21. Raised structure, 22. Explosion-proof holes;

[0031] 3 Insulating layer, 31 Spray coating, 32 First insulating film, 321 Extension, 322 Flanged structure, 323 Circular notch;

[0032] 4 bare cells, 41 tabs;

[0033] 5. Second insulating film;

[0034] 6. Explosion-proof valve. Detailed Implementation

[0035] To enable those skilled in the art to better understand the technical solutions of this application, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0036] The battery cell includes a top cover assembly, a housing, and a bare battery cell. The housing has an inner cavity and an opening. The top cover assembly includes a cover plate and a lower plastic layer. The cover plate can close onto the opening of the housing and is circumferentially sealed and fixed to the housing to form an installation cavity. The bare battery cell and the lower plastic layer are both located within this installation cavity. The lower plastic layer is made of plastic and provides insulation and protection between the cover plate and the bare battery cell. The surface of the lower plastic layer away from the cover plate (i.e., the surface facing the bare battery cell) also has a raised structure. This raised structure can abut against the surface of the bare battery cell to provide support for the bare battery cell. Grooves are formed between the raised structures to provide clearance space for the tabs of the bare battery cell.

[0037] To avoid the lower plastic affecting the fixing operation between the cover plate and the housing, the circumferential edge of the cover plate extends outward beyond the edge of the lower plastic. In other words, the projection of the lower plastic on the side surface of the cover plate facing the lower plastic falls completely into the surface of the cover plate. Therefore, in the assembled state, there is still a gap between the circumferential side wall of the lower plastic and the inner wall of the housing.

[0038] Inverting the battery cells within the battery pack can increase space utilization and volumetric energy density, thereby improving the vehicle's range. However, when the cells are inverted, the bare cells, due to their own weight, are supported by the lower plastic layer. Compared to placing the bare cells upright, the supporting area of ​​the lower plastic layer is relatively small. After impacts such as vibrations, the electrode plates of the bare cells may break and shed powder, causing active materials to fall into the top cover assembly. This can lead to overlap between the bare cells and the cover plate of the top cover assembly, posing a risk of short circuit. Furthermore, during the manufacturing process, residual metal particles inside the bare cells (such as those generated during laser welding or electrode die-cutting) can fall into the top cover assembly when the cells are inverted, creating overlap between the bare cells and the cover plate and posing a risk of short circuit. In other words, inverting the cells may pose a risk of short circuit, which in turn may lead to corrosion and leakage of the casing.

[0039] Furthermore, the tabs of the bare battery cell are wrapped with an insulating layer. Under use, the insulating layer may be damaged due to vibration and impact, or it may fall off due to long-term immersion in the electrolyte inside the bare battery cell. This could cause the negative electrode tab to pass through the gap between the lower plastic and the shell and overlap with the cover plate, resulting in a short circuit.

[0040] In addition, if there is an external short circuit when the negative terminal of the battery cell is connected to the aluminum shell, or if the insulation resistance of the negative terminal is poor, the shell voltage will be less than 0.5V, which may lead to shell corrosion and leakage.

[0041] To address the aforementioned issues, this embodiment provides a top cover assembly, a battery cell, a battery pack, and a vehicle. The vehicle includes the aforementioned battery pack, which includes a housing and multiple battery cells disposed within the housing. Each battery cell includes a top cover assembly. By optimizing the structure of the top cover assembly, the problem of short circuits caused by the overlap between the bare battery cell 4 and the cover plate 1 due to the inverted battery cell is resolved, ensuring the stability and safety of the battery cell in use.

[0042] Specifically, such as Figure 1 and Figure 2 As shown, the top cover assembly consists of a cover plate 1 and a lower plastic 2 stacked together. The top cover assembly also includes an insulating layer 3, which is disposed between the cover plate 1 and the lower plastic 2. The projection of the insulating layer 3 on the surface of the cover plate 1 can cover the projection of the lower plastic 2 on the surface of the cover plate 1. In other words, the insulating layer 3 can form a larger insulating protection area between the cover plate 1 and the bare cell 4.

[0043] With this configuration, in a battery pack with the cells inverted, if the electrode of a bare cell 4 is damaged and powder falls off, causing active material to detach and fall onto the surface of the cover plate 1, or if residual metal particles from the bare cell 4 fall onto the surface of the cover plate 1 during the manufacturing process, the insulating layer 3 can prevent the active material and metal particles from directly contacting the cover plate 1. This avoids the active material and metal particles from forming a short circuit between the bare cell 4 and the cover plate 1, ensuring insulation between the bare cell 4 and the cover plate 1 and improving safety.

[0044] Furthermore, since the insulation layer 3 increases the area of ​​insulation protection, it can also prevent the bare cell 4 from being redundant and passing through the gap between the lower plastic 2 and the shell, thus avoiding a short circuit with the cover plate 1, thereby ensuring safety.

[0045] The cover plate 1 is also equipped with an explosion-proof valve 6. When thermal runaway occurs inside the battery cell, high-temperature and high-pressure substances can be sprayed out through the explosion-proof valve 6 to relieve pressure on the battery cell. The lower plastic 2 is equipped with an explosion-proof hole 22 corresponding to the explosion-proof valve 6. The structural strength of the explosion-proof valve 6 is weaker than that of other parts of the cover plate 1. Therefore, if the battery cell is inverted and the electrolyte in the bare battery cell 4 leaks, the electrolyte may corrode the explosion-proof valve 6, causing damage to the explosion-proof valve 6 and leakage of electrolyte from the explosion-proof valve 6, resulting in insulation failure of the battery pack.

[0046] In this embodiment, due to the setting of the insulating layer 3, the electrolyte can be isolated from the explosion-proof valve 6, reducing the probability of electrolyte corrosion of the explosion-proof valve 6 and leakage from the explosion-proof valve 6, thereby reducing the probability of insulation failure of the battery pack and improving safety.

[0047] In this embodiment, the specific structure of the insulating layer 3 is not limited, such as... Figure 1 As shown, the insulating layer 3 includes a sprayed coating layer 31 disposed on the surface of the cover plate 1 facing the lower plastic 2. This sprayed coating layer 31 can be formed on the surface of the cover plate 1 by methods including, but not limited to, UV spraying, plasma spraying, brushing, and electroplating. The sprayed coating layer 31 can cover the entire surface of the cover plate 1 facing the lower plastic 2 to ensure a sufficiently large insulating protection area, thereby ensuring the insulation effect between the cover plate 1 and the bare battery cell 4. Furthermore, forming the insulating layer 3 through the sprayed coating layer 31 simplifies the overall structure and manufacturing process.

[0048] Specifically, the spray coating layer 31 can be a mica layer, a ceramic layer, a quartz layer, a glass fiber layer, an epoxy resin layer, or a phenolic resin layer. Alternatively, the spray coating layer 31 can be a mixture of materials, including at least two of the following: mica, ceramic, quartz, glass fiber, epoxy resin, and phenolic resin. Of course, other insulating coatings can also be selected. The specific design can be adjusted according to the actual situation, offering good flexibility.

[0049] like Figure 1 As shown, the thickness D1 of the coating layer 31 is in the range of 1μm-50μm. Of course, the thickness D1 of the coating layer 31 can also be 0.5μm, 0.8μm, 0.9μm, or 60μm, 70μm, 80μm, etc. Setting the thickness D1 of the coating layer 31 in the range of 1μm-50μm, specifically 1μm, 5μm, 10μm, 20μm, 30μm, 40μm, 50μm, etc., can more reliably ensure insulation performance compared to the scheme where the thickness D1 of the coating layer 31 is set below 1μm. At a voltage of 1000V, the insulation resistance value of the insulation layer 3 is greater than 200 MΩ, thereby ensuring the stability and safety of the battery cell in use. Compared to the scheme where the thickness D1 of the coating layer 31 is set above 50μm, it can reduce the volume occupied by the coating layer 31 and reduce the impact on the overall volume and weight of the battery cell.

[0050] Of course, the insulating layer 3 can also be set to include an insulating adhesive layer pasted on the surface of the cover plate 1, and no specific restrictions are made here.

[0051] The insulating layer 3 may also include, for example, Figures 2-5 The first insulating film 32 shown has its circumferential edge extending outward from the circumferential edge of the lower plastic 2 to form an extension 321, so that when the first insulating film 32 is in the unfolded state, the projection of the first insulating film 32 on the surface of the cover plate 1 completely covers the projection of the lower plastic 2 on the surface of the cover plate 1.

[0052] When assembling the battery cell, after assembling the cover plate 1 assembly and the bare battery cell 4, the entire assembly is then assembled with the housing, and the cover plate 1 and the housing are sealed and fixed by circumferential welding. Specifically, when assembling the top cover assembly and the bare battery cell 4, the side wall of the battery cell away from the top cover assembly and the peripheral side wall of the battery cell are wrapped with a second insulating film 5, and the extension 321 of the first insulating film 32 is folded towards one side of the bare battery cell 4 to form a shape as shown in the figure. Figure 5 The flange structure 322 shown can wrap around the periphery of the lower plastic 2 facing the cover plate 1, and the side of the second insulating film 5 facing the top cover assembly can overlap and fix it circumferentially with the flange structure 322 (e.g.) Figure 6 As shown, the first insulating film 32 can wrap the lower plastic 2 and the bare battery cell 4 from the side facing the cover plate 1, preventing the bare battery cell 4 from contacting the cover plate 1 and avoiding short circuits. The second insulating film 5 can wrap the outer wall of the bare battery cell 4 from the side facing the shell, preventing the bare battery cell 4 from contacting the shell and avoiding short circuits. By overlapping and fixing the first insulating film 32 and the second insulating film 5, the bare battery cell 4 can be wrapped inside the insulating film, preventing contact with the outer cover plate 1 and the shell, thereby effectively avoiding short circuits.

[0053] Since the first insulating film 32 can wrap the bare cell 4 towards the cover plate 1 from the end and the periphery, when the cell is inverted, if metal particles fall from the bare cell 4, the first insulating film 32 can effectively catch the metal particles and prevent them from falling to the cover plate 1. Furthermore, even if the tab 41 of the bare cell 4 is too large, the first insulating film 32 can still wrap the end of the bare cell 4, including the tab 41, to prevent the tab 41 from reaching the cover plate 1 through the gap between the lower plastic 2 and the shell, thereby avoiding contact between the tab 41 and the cover plate 1 and preventing a short circuit.

[0054] The first insulating film 32 can form a container-like structure through the flange structure 322. When the battery cell is inverted, the electrolyte in the bare battery cell 4 will fall to the side facing the top cover assembly under the action of gravity. The first insulating film 32 can also prevent the electrolyte in the bare battery cell 4 from leaking through the flange structure 322, thereby further preventing the electrolyte from leaking to the explosion-proof valve 6 and further improving safety.

[0055] Specifically, there are no restrictions on the fixing method after the first insulating film 32 and the second insulating film 5 are overlapped. For example, the fixing can be achieved by heat fusion. For example, multiple fused chains are set at intervals along the thickness direction of the cover plate 1 on the circumference of the bare cell 4. The fused chains can include multiple fused points fixed at intervals along the circumference of the bare cell 4, or they can include continuous fused lines fixed along the circumference of the bare cell 4.

[0056] like Figure 3 and Figure 5 As shown, the width W of the extension 321 of the first insulating film 32 is not less than 0.5 mm. Of course, the width W of the extension 321 can also be 0.4 mm, 0.3 mm, etc. Setting the width W of the extension 321 to not less than 0.5 mm, such as 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, etc., makes it possible that during assembly, the width W of the flange structure 322 formed by the extension 321 is not less than 0.5 mm, which facilitates the overlapping and fixing of the second insulating film 5 and the first insulating film 32, simplifying the assembly process.

[0057] like Figure 2As shown, the thickness D2 of the first insulating film 32 is preferably 50μm-150μm. Of course, the thickness D2 of the first insulating film 32 can also be set to less than 50μm, such as 45μm, 40μm, 35μm, etc., or the thickness D2 of the first insulating film 32 can also be set to more than 150μm, such as 160μm, 170μm, 180μm, etc. Setting the thickness D2 of the first insulating film 32 to 50μm-150μm, such as 50μm, 70μm, 90μm, 100μm, 120μm, 140μm, 150μm, etc., can more reliably ensure insulation performance compared to the option of setting the thickness D2 of the first insulating film 32 to less than 50μm, thereby ensuring the stability and safety of the battery cell in use. Compared to the option of setting the thickness D2 of the first insulating film 32 to more than 150μm, it can reduce the volume of the first insulating film 32 and reduce the impact on the overall volume and weight of the battery cell.

[0058] In this embodiment, the thickness of the second insulating film 5 is not limited; it can be the same as or different from the thickness of the first insulating film 32. Furthermore, the materials of the first insulating film 32 and the second insulating film 5 are not limited; for example, Mylar film, PET film, PP film, etc., can be used, and the materials of the first insulating film 32 and the second insulating film 5 can be the same or different.

[0059] like Figure 3 As shown, the first insulating film 32 is also provided with an explosion-proof zone corresponding to the explosion-proof valve 6. This explosion-proof zone is further provided with annular grooves 323 along its circumference. The thickness of these grooves 323 is less than the thickness at other locations on the first insulating film 32, making the structural strength at these grooves relatively weak. When thermal runaway occurs within the battery cell, the pressure inside the mounting cavity increases, causing a rupture at the groove. The pressure within the space enclosed by the first insulating film 32 and the second insulating film 5 increases, breaking through the annular grooves 323 and ejecting from the explosion-proof zone. This pressure is then released outwards through the explosion-proof valve 6, thus achieving pressure relief. The annular grooves 323 weaken the structural strength of the explosion-proof zone, ensuring that pressure relief can be achieved through the explosion-proof valve 6 when thermal runaway occurs in the battery cell.

[0060] Specifically, there are no restrictions on the forming process of the annular groove 323; it can be formed by etching or pressing. Furthermore, the annular groove 323 can be a groove continuously arranged along the circumference of the explosion-proof area, or it can be multiple groove points or groove lines arranged at intervals along the circumference of the explosion-proof area.

[0061] As can be seen from the above embodiments, the cover plate 1 assembly provided in this embodiment can be constructed by means of, for example... Figure 1 As shown, the insulating layer 3 can also be formed by applying an insulating coating 31 to the surface of the cover plate 1. Figures 2-5 As shown, the insulating layer 3 can be formed by providing a first insulating film 32 between the cover plate 1 and the lower plastic 2. Of course, the insulating layer 3 can also be as follows: Figure 7 As shown, it includes both the above-mentioned spray coating 31 and the first insulating film 32. That is, the surface of the cover plate 1 is formed by spraying to form the spray coating 31. At the same time, the first insulating film 32 is also provided between the cover plate 1 and the lower plastic 2 to further improve the safety when the battery cell is inverted.

[0062] In the description of this application, it should be understood that the terms "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0063] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0064] The above are merely preferred embodiments of this application. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A top cover assembly, characterized in that, It includes a cover plate and a lower plastic layer stacked together, and an insulating layer is provided between the cover plate and the lower plastic layer. The projection of the insulating layer on the surface of the cover plate covers the projection of the lower plastic layer on the surface of the cover plate.

2. The top cover assembly according to claim 1, characterized in that, The insulating layer includes a sprayed coating on the side surface of the cover plate facing the lower plastic.

3. The top cover assembly according to claim 2, characterized in that, The material of the spray coating includes at least one of mica, ceramic, quartz, glass fiber, epoxy resin and phenolic resin.

4. The top cover assembly according to claim 2 or 3, characterized in that, The thickness of the sprayed coating is 1μm-50μm.

5. The top cover assembly according to any one of claims 1-3, characterized in that, The cover plate is also provided with an explosion-proof valve. The insulating layer includes a first insulating film. The first insulating film is also provided with an explosion-proof zone corresponding to the explosion-proof valve. The explosion-proof zone is also provided with annular grooves along the circumference.

6. The top cover assembly according to any one of claims 1-3, characterized in that, The insulating layer includes a first insulating film, the circumferential edge of which extends outward from the circumferential edge of the lower plastic and forms an extension.

7. The top cover assembly according to claim 6, characterized in that, The width of the extension is not less than 0.5 mm; And / or, the thickness of the first insulating film is 50 μm - 150 μm.

8. The top cover assembly according to claim 6, characterized in that, The cover plate is also provided with an explosion-proof valve, and the first insulating film is also provided with an explosion-proof zone corresponding to the explosion-proof valve. The explosion-proof zone is also provided with annular grooves along the circumference.

9. A battery cell, characterized in that, Includes a housing, bare battery cells, and a top cover assembly as described in any one of claims 1-4; The top of the housing has an opening, and the cover plate of the top cover assembly covers the opening and surrounds the housing to form an installation cavity. The lower plastic and the bare battery cell are both located in the installation cavity.

10. A battery cell, characterized in that, Includes a housing, bare battery cells, and a top cover assembly as described in any one of claims 5-8; The housing has an opening, and the cover plate of the top cover assembly covers the opening and surrounds the housing to form a mounting cavity. The lower plastic and the bare battery cell are both located inside the mounting cavity. The side wall of the bare battery cell away from the top cover assembly and the peripheral side wall of the bare battery cell are also covered with a second insulating film. The lower plastic has a flange structure along the circumferential direction on the side facing the cover plate. The flange structure is formed by the extension of the first insulating film. The second insulating film is circumferentially overlapped and fixed with the flange structure on the side facing the top cover assembly.

11. A battery pack, characterized in that, Includes the battery cell as described in claim 9 or 10.

12. A vehicle, characterized in that, Includes the battery pack as described in claim 11.

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