Top cover structure and battery cell

Abstract

The utility model relates to the technical field of battery manufacturing provides a top cover structure and electric core, top cover structure includes top cover body, first plastic piece and insulation buffer piece, first plastic piece is located top cover body one side's surface towards electric core pole group, insulation buffer piece fixedly arranged in first plastic piece one side's surface towards electric core pole group, and make in top cover structure assembly state, insulation buffer piece far away from first plastic piece's surface and the surface contact of electric core pole group corresponding, the utility model discloses set up buffer piece on one side of first plastic piece, and the buffer piece is used for buffering pressure, thereby can effectively avoid first plastic piece directly with electric core pole group contact, make in electric core pole group in effective compression, will not cause damage to pole group pole piece due to overpressure.

Description

Technical Field

[0001] This utility model relates to the technical field of battery manufacturing, and in particular to a top cover structure and a battery cell. Background Technology

[0002] A battery cell typically includes a casing, an electrode assembly inside the casing, and a top cover structure on top of the casing. The electrode assembly inside the casing, whether wound or stacked, consists of positive and negative electrodes stacked together. The separator is a thin film located between the positive and negative electrodes, possessing very high electrical insulation to prevent direct contact between the positive and negative electrodes, thus avoiding short circuits.

[0003] In related technologies, due to the influence of the battery manufacturing process, the lower plastic at the bottom of the top cover is at risk of overpressure electrode assembly, which may eventually damage the separator in the overpressure electrode assembly, causing damage to the positive or negative electrode sheet, ultimately affecting battery performance. Utility Model Content

[0004] This utility model provides a top cover structure and a battery cell to solve the defect in the prior art where the top cover structure easily damages the electrode sheets.

[0005] This utility model provides a top cover structure, including: a top cover body, a first plastic part, and an insulating buffer; the first plastic part is disposed on the surface of the top cover body facing the battery cell electrode group; the insulating buffer is disposed on the surface of the first plastic part facing the length direction of the battery cell electrode group, such that when the top cover structure is assembled, the surface of the insulating buffer away from the first plastic part contacts the surface corresponding to the battery cell electrode group.

[0006] According to the top cover structure provided by this utility model, the first plastic part is arranged along the length direction of the top cover body, and support portions are provided at both ends of the first plastic part along the length direction. The insulating buffer is provided on the surface of each support portion facing the battery cell electrode group.

[0007] According to the top cover structure provided by this utility model, each of the support parts is constructed with a hollow cavity structure, and the bottom surface of the cavity structure facing the battery cell electrode group has multiple liquid passage holes.

[0008] According to the top cover structure provided by this utility model, the top cover body is provided with a liquid injection hole, which is connected to one of the cavity structures; wherein, along the thickness direction of the top cover body, the projection of the liquid injection hole is located in the middle of the bottom surface of the cavity structure facing the battery cell electrode group, and a plurality of liquid passage holes are spaced apart along the circumferential edge of the bottom surface of the cavity structure facing the battery cell electrode group.

[0009] According to the top cover structure provided by this utility model, the buffer member is provided with a plurality of connecting holes, and the plurality of connecting holes are provided in a one-to-one correspondence with the liquid passage hole.

[0010] According to the top cover structure provided by this utility model, some of the connecting holes have a raised edge structure, the outer diameter of the edge structure is less than or equal to the inner diameter of the liquid passage hole, and the edge structure is inserted into the liquid passage hole.

[0011] According to the top cover structure provided by this utility model, an adhesive layer is provided on the side of the buffer member that is connected to the first plastic member.

[0012] According to the top cover structure provided by this utility model, the thickness of the insulating buffer is 0.3mm-2mm.

[0013] According to the top cover structure provided by this utility model, the insulating buffer includes either a polypropylene foam pad or a carbon fiber pad.

[0014] This utility model also provides a battery cell, comprising: a housing and a top cover structure as described in any of the above; the housing has a receiving space for accommodating the battery cell electrode assembly; the top cover structure is disposed on the top of the housing.

[0015] The top cover structure and battery cell provided by this utility model have a buffer component on one side of the first plastic part. The buffer component buffers the pressure, thereby effectively preventing the first plastic part from directly contacting the battery cell electrode assembly. This ensures that the electrode assembly will not be damaged due to overpressure when the battery cell electrode assembly is under effective compression. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is a top view schematic diagram of the top cover structure provided by this utility model.

[0018] Figure 2 This utility model provides Figure 1 Schematic diagram of the cross-sectional structure along the AA direction.

[0019] Figure 3 This is a bottom view of the top cover structure provided by this utility model without the buffer component assembled.

[0020] Figure 4This is a bottom view of the top cover structure provided by this utility model, which is equipped with a buffer component.

[0021] Figure 5 This is a partial cross-sectional structural schematic diagram of another embodiment of the top cover structure provided by this utility model.

[0022] Figure 6 This is a schematic diagram of the internal structure of the battery cell provided by this utility model.

[0023] Figure label: 10. Top cover structure; 11. Top cover body; 111. Injection hole; 12. First plastic part; 121. Support part; 122. Buffer cavity; 123. Liquid passage hole; 124. Process cavity; 13. Buffer component; 131. Connecting hole; 132. Edge structure; 14. Second plastic part; 20. Housing; 30. Battery cell electrode assembly. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0025] In the description of the embodiments of this utility model, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the purpose of clarifying the embodiments of this utility model 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 the embodiments of this utility model. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0026] In the description of the embodiments of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this utility model according to the specific circumstances.

[0027] In this embodiment of the utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0028] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0029] In related technologies, during the molding process of the top cover structure, the plastic parts undergo deformation due to the temperature of the welding area. This results in a reduction in the axial thickness of the plastic parts, causing the entire pole to sink. Consequently, the effective extrusion deformation of the seal is reduced, leading to a decrease in the sealing effect. Furthermore, if the pressure applied to the pole during assembly is further increased, the upper plastic will be subjected to excessive stress, causing it to crack.

[0030] To address the issues in the relevant technologies, the following will be discussed in conjunction with... Figures 1-5This invention describes a top cover structure 10, which includes a top cover body 11, a first plastic part 12, and an insulating buffer part 13. The first plastic part 12 is disposed on the surface of the top cover body 11 facing the battery cell electrode assembly 30. The insulating buffer part 13 is disposed on the surface of the first plastic part 12 facing the length direction of the battery cell electrode assembly 30, such that when the top cover structure 10 is assembled, the surface of the insulating buffer part 13 away from the first plastic part 12 is in contact with the corresponding surface of the battery cell electrode assembly 30. When the top cover structure is connected to the cell housing 20, the first plastic part 12 on the top cover structure 10 can apply pressure to the cell electrode group 30 inside the cell, thereby maintaining the stability of the cell electrode group 30. In this embodiment, by providing an insulating buffer 13 on the first plastic part 12, the insulating buffer 13 can buffer the pressure during the pressure application process, thereby effectively preventing the first plastic part 12 from directly contacting the cell electrode group 30. This ensures that the cell electrode group 30 will not be damaged due to overpressure within the effective compression range, thus improving the yield and performance of the cell.

[0031] Specifically, the top cover body 11 has an overall elongated block structure with a first surface and a second surface in its thickness direction. The first surface faces the cell electrode assembly 30 inside the cell, and the second surface is away from the cell electrode assembly 30. A second plastic component 14 is provided on the second surface. The first plastic component 12 is provided on the first surface and protrudes from it. An insulating buffer 13 is connected to the first plastic component 12 and is located between the cell electrode assembly 30 and the first plastic component 12. It can provide buffering when pressure is applied to the first plastic component 12, thereby avoiding damage to the electrode sheets caused by overpressure.

[0032] Among them, the insulating buffer 13 is made of insulating material and has good corrosion resistance, so that it can buffer during the pressure application process and remain inside the battery cell housing 20 for a long time without being corroded by the electrolyte, thereby improving the service life and overall stability of the top cover structure 10.

[0033] Understandably, in the traditional top cover structure 10, the contact between the first plastic part 12 and the cell assembly is rigid during installation. This can lead to damage to the cell electrode sheets during pressure connection and cell assembly positioning, thus affecting the yield rate and the performance of the finished cell. This embodiment addresses this by providing an insulating buffer 13 between the first plastic part 12 and the cell electrode assembly 30, enabling flexible contact between them and preventing damage to the electrode sheets during pressure application.

[0034] In a specific configuration, the insulating buffer 13 can be configured as a long strip-shaped structure, located on the surface of the first plastic part 12 facing the battery cell electrode assembly 30. The projection of the insulating buffer 13 onto the surface of the top cover body 11 facing the battery cell electrode assembly 30 coincides with the projection of the first plastic part 12 onto the surface of the top cover body 11 facing the battery cell electrode assembly 30. This allows the insulating buffer 13 to completely cover the contact area between the first plastic part 12 and the battery cell electrode assembly 30, ensuring flexible contact between them and preventing damage to the electrode sheets due to overvoltage.

[0035] Of course, the insulating buffer 13 can also be provided only in the contact area between the first plastic part 12 and the battery cell electrode assembly 30, to achieve flexible contact between the first plastic part 12 and the battery cell electrode assembly 30. Alternatively, the insulating buffer 13 can be provided on both vertical end faces of the battery cell electrode assembly 30, so that there is a flexible insulating buffer 13 between the battery cell electrode assembly 30 and the first plastic part 12, to achieve flexible contact.

[0036] In conjunction with the above embodiments, the first plastic part 12 is arranged along the length direction of the top cover body 11, and support portions 121 are provided at both ends of the first plastic part 12 along its length direction. Each support portion 121 has an insulating buffer 13 on its surface facing the cell electrode assembly 30. The first plastic part 12 is used to contact the cell electrode assembly 30 inside the cell and to stabilize the cell electrode assembly 30. In this embodiment, by providing support portions 121 at both ends of the first plastic part 12 along its length direction, the cell electrode assembly 30 can be effectively limited, and flexible contact can be achieved through the corresponding insulating buffer 13, avoiding damage to the electrode sheets caused by overvoltage.

[0037] Specifically, the surface of the first plastic part 12 facing the battery cell electrode assembly 30 is a non-flat surface, and it has two support portions 121 protruding towards the battery cell electrode assembly 30. The support portions 121 contact the surface of the battery cell electrode assembly 30 facing the first plastic part 12 and limit its position, thus ensuring the stability of the battery cell electrode assembly 30.

[0038] It is understandable that by providing support portions 121 at both ends of the length direction of the first plastic part 12, the force can be distributed more evenly, making the first plastic part 12 more stable when subjected to pressure.

[0039] In a specific configuration, the support portions 121 at both ends of the first plastic part 12 along its length have the same surface shape and size facing the battery cell electrode assembly 30. The identical support portions 121 allow the first plastic part 12 to experience more uniform force when pressure is applied, improving its stability during assembly.

[0040] In conjunction with the above embodiments, each support portion 121 has a hollow cavity structure, and the bottom surface of the cavity structure facing the battery cell electrode assembly 30 has multiple liquid passage holes 123. The hollow cavity structure in the first plastic part 12 facilitates the weight reduction of the top cover assembly, and the liquid passage holes 123 allow the electrolyte to flow in.

[0041] Specifically, the two support portions 121 along the length of the first plastic part 12 have different dimensions. The cavity within one support portion 121 serves as a buffer cavity 122 for injecting electrolyte, while the cavity within the remaining support portion 121 serves as a process cavity 124. By limiting the dimensions, a longer electrode assembly tab arrangement between the two support portions 121 can be achieved, enabling fast charging and high-power charging. Furthermore, an injection hole 111 for electrolyte injection is provided on the top cover body 11. The injection hole 111 communicates with the buffer cavity 122, allowing electrolyte to be injected into the buffer cavity 122 and the space containing the battery cell assembly through the injection hole 111.

[0042] The process cavity 124 facilitates the molding of the first plastic part 12 and can accommodate the leaked electrolyte during subsequent use of the battery cell, preventing the electrolyte from overflowing outside the battery cell. Specifically, the process cavity 124 is connected to the space where the battery cell electrode group 30 is located through the liquid passage hole 123 at its bottom. After the electrolyte leaks out, it enters the process cavity 124 through the liquid passage hole 123 for temporary storage, preventing the electrolyte from overflowing outside the battery cell.

[0043] It is understandable that when designing high-power charging cells, a larger electrode group tab is usually required. As for the buffer cavity 122, since it needs to play a buffering role for the injected electrolyte, it is difficult to reduce the size of the buffer cavity 122. Therefore, in order to set a larger electrode group tab size, the size of the process cavity 124 is reduced.

[0044] In conjunction with the above embodiments, the top cover body 11 is provided with a liquid injection hole 111, which communicates with one of the cavity structures. The projection of the liquid injection hole 111 along the thickness direction of the top cover body 11 is located in the middle of the bottom surface of the cavity structure facing the cell electrode assembly 30, and multiple liquid passage holes 123 are spaced apart along the circumferential edge of the bottom surface of the cavity structure facing the cell electrode assembly 30. When injecting electrolyte into the cell, the injected electrolyte is often a pressurized liquid. This embodiment improves the stability and safety of liquid injection by arranging multiple liquid passage holes 123 circumferentially spaced to avoid direct correspondence with the liquid injection hole 111.

[0045] Specifically, the cavity structure of the support part 121 connected to the injection hole 111 is the aforementioned buffer cavity 122. By setting the liquid passage hole 123 in the circumferential direction of the bottom surface of the buffer cavity 122, it can avoid being directly opposite the injection hole 111, so that the injected electrolyte can be buffered through the buffer cavity 122 first, and then output through the liquid passage hole 123.

[0046] Of course, it is understandable that the insulating buffer 13 can be designed with a perforated or finely perforated structure to allow electrolyte leakage, ensuring that the insulating buffer 13 does not obstruct the connection between the buffer cavity 122 and the space containing the cell electrode assembly 30. For example, a flexible pad structure with filter holes can be used, which can both provide buffering and allow the connection between the buffer cavity 122 and the space containing the cell electrode assembly 30.

[0047] In some embodiments, the insulating buffer 13 has multiple connecting holes 131, which are corresponding one-to-one with the liquid passage holes 123. The insulating buffer 13 needs to ensure the communication between the cavity structure and the space where the electrode group is located. In this embodiment, the connecting holes 131 are provided to ensure the flow of electrohydraulic fluid.

[0048] Specifically, the connecting holes 131 arranged on the insulating buffer 13 and the liquid passage holes 123 on the cavity structure are arranged in the same way and are connected in a one-to-one correspondence manner, thereby ensuring that the cavity structure is connected to the space where the battery cell electrode group 30 is located in the shell 20, so as to realize the smooth flow of electrolyte.

[0049] like Figure 3 , Figure 4 As shown, three liquid passage holes 123 are formed on the bottom surface of the cavity structure facing the cell electrode assembly 30 at one end, and corresponding connecting holes 131 are formed on the insulating buffer member 13. Similarly, seven liquid passage holes 123 are formed on the bottom surface of the cavity structure facing the cell electrode assembly 30 at the other end, and corresponding connecting holes 131 are also formed on the insulating buffer member 13 to realize the connection of the cavity structure.

[0050] In conjunction with the above embodiments, such as Figure 5 As shown, in some other embodiments, the edge of a portion of the connecting hole 131 has a raised edge structure 132, the outer diameter of which is less than or equal to the inner diameter of the liquid passage hole 123, and the edge structure 132 is inserted into the liquid passage hole 123. In this embodiment, the cooperation between the edge structure 132 and the liquid passage hole facilitates the rapid positioning of the insulating buffer 13, ensuring the connection accuracy of the insulating buffer 13.

[0051] Specifically, the edge structure 132 is an annular protrusion structure. The edge structure 132 is concentric with the corresponding connecting hole 131. During positioning, the edge structure 132 is inserted into the liquid passage hole 123 to achieve effective pre-positioning of the insulating buffer 13, which is beneficial to the connection of the insulating buffer 13 and improves the connection position accuracy of the insulating buffer 13.

[0052] When the inner diameter of the edge structure 132 is smaller than that of the liquid passage hole 123, it facilitates the assembly of the edge structure 132. Preferably, the outer diameter of the edge structure 132 is slightly smaller than that of the inner diameter of the liquid passage hole 123. When the outer diameter of the edge structure 132 is the same as that of the inner diameter of the liquid passage hole 123, it can ensure stable positioning and improve the stability of the connection of the insulating buffer 13.

[0053] In some embodiments, an adhesive layer is provided on the side of the insulating buffer 13 that is connected to the first plastic part 12. The adhesive layer enables rapid connection of the insulating buffer 13, improves the efficiency of the connection, and ensures the quality of the connection through the edge structure 132.

[0054] Specifically, an adhesive is applied to the side of the insulating buffer 13 that is connected to the first plastic part 12 to form an adhesive layer. The adhesive layer facilitates the rapid connection of the insulating buffer 13.

[0055] In some embodiments, the thickness of the insulating buffer 13 is 0.3mm-2mm. The thickness of the insulating buffer 13 directly affects the buffering effect and the overall space design. This embodiment limits the thickness within this range, so that the insulating buffer 13 can achieve both effective buffering and reasonable use of space.

[0056] Specifically, when the thickness of the insulating buffer 13 is less than the lower limit of 0.3 mm, it is difficult to provide effective buffering. As a result, when pressure is applied to the cell electrode assembly 30, the first plastic part 12 contacts the electrode assembly through the insulating buffer 13, thereby causing damage to the electrode plates and the external diaphragm. When the thickness of the insulating buffer 13 exceeds the upper limit of 2 mm, its excessive thickness leads to structural redundancy, resulting in significant waste of space utilization and layout.

[0057] In specific settings, the thickness of the insulating buffer 13 is 0.3mm, 0.6mm, 1mm, 1.2mm, 1.5mm, 1.7mm or 2mm.

[0058] In some embodiments, the insulating buffer 13 comprises either a polypropylene foam pad or a carbon fiber pad. By limiting the material of the insulating buffer 13, it achieves good insulation properties and corrosion resistance.

[0059] Specifically, the insulating buffer 13 uses polypropylene foam pads, which have good water resistance, corrosion resistance, pressure resistance, and thermal insulation properties. Alternatively, the insulating buffer 13 can use carbon fiber pads, which utilize the high strength, lightweight, corrosion resistance, good electrical insulation, thermal conductivity, and vibration resistance of carbon fiber to improve the safety, reliability, and lifespan of the battery.

[0060] This utility model also provides a battery cell, such as Figure 6 As shown, it includes a housing 20 and a top cover structure 10 as provided in any of the above; the housing 20 has a receiving space for accommodating the cell electrode assembly 30; the top cover structure 10 is disposed on the top of the housing 20.

[0061] Specifically, insulating buffers 13 are provided on both sides of the end face of the cell electrode assembly 30, so that the external structure and the cell electrode assembly 30 are in flexible contact, thus avoiding damage to the cell electrode assembly 30.

[0062] The battery cell provided in this example has the top cover structure 10 of any of the aforementioned embodiments. Therefore, the battery cell in this example has the characteristic effects of each of the aforementioned top cover structures 10. To avoid the redundancy of the effect description, it will not be repeated here.

[0063] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment, by providing an insulating buffer 13 on one side of the first plastic part 12, achieves overall buffering through the insulating buffer 13, thereby effectively preventing the first plastic part 12 from directly contacting the battery cell electrode assembly 30. This ensures that, within the effective compression range, the electrode assembly 30 will not be damaged due to overpressure, affecting the electrode sheets and the external diaphragm. Furthermore, by selecting either a polypropylene foam pad or a carbon fiber pad, it has better corrosion resistance and its service life is improved. Furthermore, the presence of the edge structure 132 on the insulating buffer 13 makes installation of the insulating buffer 13 more convenient and facilitates rapid positioning and connection of the insulating buffer 13.

[0064] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A top cover structure, characterized in that, include: Top cover body; The first plastic component is disposed on the surface of the top cover body facing the battery cell electrode assembly; An insulating buffer is provided on the surface of the first plastic part facing the length direction of the battery cell electrode group, such that when the top cover structure is assembled, the surface of the insulating buffer away from the first plastic part is in contact with the surface corresponding to the battery cell electrode group.

2. The top cover structure according to claim 1, characterized in that, The first plastic part is arranged along the length direction of the top cover body, and a support portion is provided at both ends of the first plastic part along the length direction. The insulating buffer is provided on the surface of each support portion facing the battery cell electrode group.

3. The top cover structure according to claim 2, characterized in that, Each of the aforementioned support sections is constructed with a hollow cavity structure, and multiple liquid passage holes are opened on the bottom surface of the cavity structure facing the battery cell electrode assembly.

4. The top cover structure according to claim 3, characterized in that, The top cover body is provided with a liquid injection hole, which is connected to one of the cavity structures; wherein, along the thickness direction of the top cover body, the projection of the liquid injection hole is located in the middle of the bottom surface of the cavity structure facing the battery cell electrode group, and a plurality of liquid passage holes are spaced apart along the circumferential edge of the bottom surface of the cavity structure facing the battery cell electrode group.

5. The top cover structure according to claim 3, characterized in that, The buffer component has multiple connecting holes, and each of the multiple connecting holes is configured to correspond one-to-one with the liquid passage hole.

6. The top cover structure according to claim 5, characterized in that, Some of the connecting holes have a raised edge structure along their edges, the outer diameter of which is less than or equal to the inner diameter of the liquid passage hole, and the edge structure is inserted into the liquid passage hole.

7. The top cover structure according to any one of claims 1 to 6, characterized in that, An adhesive layer is provided on the side of the buffer component that connects to the first plastic component.

8. The top cover structure according to claim 1, characterized in that, The thickness of the insulating buffer is 0.3mm-2mm.

9. The top cover structure according to claim 1, characterized in that, The insulating cushioning component includes either a polypropylene foam pad or a carbon fiber pad.

10. A battery cell, characterized in that, include: case; And the top cover structure according to any one of claims 1-9; the housing has a receiving space for accommodating the battery cell electrode assembly; The top cover structure is located on the top of the housing.

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