Cover plate structure and battery cell

Abstract

The utility model relates to energy storage equipment technical field especially relates to a cover plate structure and electric core, cover plate structure includes top cap, pole and riveting block. Top cap is provided with N first through -hole, N is the positive integer greater than 1. Pole includes bottom plate and the N cylinder portion that is connected with bottom plate, N cylinder portion is one -to -one corresponding and is arranged in N first through -hole, and bottom plate is located the side of top cap towards the inside of electric core. Riveting block is located the side of top cap towards the outside of electric core, and N cylinder portion is fixed through riveting deformation and riveting block. Electric core includes shell and above -mentioned cover plate structure, and cover plate structure covers and sets in the opening place of shell. The cover plate structure and electric core can improve the assembly efficiency, reduce the processing cost while helping to improve the overcurrent capacity.

Description

Technical Field

[0001] This utility model relates to the field of energy storage equipment technology, and in particular to a cover plate structure and a battery cell. Background Technology

[0002] The cover structure of a battery cell includes terminals. To improve the current-carrying capacity of the cover structure, the diameter of the terminals needs to be increased. However, for blade batteries, the top cover of the cover structure is long and narrow, and the increase in the terminal diameter is limited by the width of the top cover. The current-carrying capacity of the cover structure of blade batteries can be improved by increasing the number of terminals and rationally designing their positions. However, setting multiple individual terminals increases assembly steps, increases processing costs, and reduces assembly efficiency. Utility Model Content

[0003] One objective of this invention is to provide a cover plate structure that can improve assembly efficiency and reduce processing costs while helping to increase flow capacity.

[0004] To achieve this objective, the present invention adopts the following technical solution:

[0005] A cover plate structure is provided, comprising:

[0006] The top cover has N first through holes, where N is a positive integer greater than 1;

[0007] The electrode post includes a base plate and N column parts connected to the base plate. The N column parts are respectively inserted through the N first through holes. The base plate is located on the side of the top cover facing the inside of the battery cell.

[0008] A riveting block is located on the side of the top cover facing the outside of the battery cell, and N of the column portions are fixed to the riveting block by riveting deformation.

[0009] Optionally, it also includes N adapter rings, each of which is fitted onto one of the N column parts, and each adapter ring is sandwiched between the riveting protrusion of the corresponding column part and the riveting block.

[0010] Optionally, the riveting block has N receiving grooves on its end face facing the outside of the battery cell. Each receiving groove has a second through hole at its bottom. The N cylindrical parts are inserted one-to-one through the N second through holes. Each adapter ring includes an annular part, which is sandwiched between the bottom of the receiving groove and the end face of the riveting protrusion facing the inside of the battery cell.

[0011] Optionally, the annular portion is coaxially arranged with the columnar portion, and the width a of the annular portion along the radial direction satisfies: 1mm≤a≤2mm.

[0012] Optionally, each of the adapter rings includes a tubular portion sandwiched between the groove wall of the receiving groove and the riveted outer side wall.

[0013] Optionally, the tubular portion is welded to the riveted protrusion.

[0014] Optionally, along the axial direction of the column portion, the height c of the riveting protrusion satisfies: 0.8mm≤c≤2mm;

[0015] And / or, along the axial direction of the column portion, the weld penetration depth b between the tubular portion and the riveting protrusion and the height c of the riveting protrusion satisfy: 0.3mm≤b≤0.85c.

[0016] Optionally, it also includes N sealing rings, each of which is fitted onto one of the N columnar portions, with the sealing ring portion sandwiched between the end face of the bottom plate facing the outside of the battery cell and the end face of the top cover facing the inside of the battery cell.

[0017] Optionally, before the sealing ring is compressed, the width e of the sealing ring, which is sandwiched between the end face of the bottom plate facing the outside of the cell and the end face of the top cover facing the inside of the cell, along the radial direction of the cylindrical portion, satisfies: 0.5mm≤e≤1.5mm;

[0018] And / or, along the axial direction of the column portion, the thickness d of the sealing ring after compression, sandwiched between the end face of the bottom plate facing the outside of the cell and the end face of the top cover facing the inside of the cell, satisfies: 0.3mm≤d≤1mm.

[0019] Another objective of this invention is to provide a battery cell that can improve assembly efficiency and reduce processing costs while helping to increase current carrying capacity.

[0020] To achieve this objective, the present invention adopts the following technical solution:

[0021] A battery cell is provided, including a housing and the aforementioned cover structure, the cover structure covering an opening in the housing.

[0022] The beneficial effects of this utility model are:

[0023] This utility model provides a cover plate structure, including a top cover, poles, and a riveting block. The top cover has N first through holes, where N is a positive integer greater than 1. Each pole includes a base plate and N cylindrical portions connected to the base plate. The N cylindrical portions are correspondingly inserted through the N first through holes. The base plate is located on the side of the top cover facing the inside of the battery cell. The riveting block is located on the side of the top cover facing the outside of the battery cell. The N cylindrical portions are riveted and deformed to be fixed to the riveting block. By connecting the N cylindrical portions to a base plate, multiple cylindrical portions can be assembled onto the top cover in one step. Riveting the cylindrical portions then fixes the poles onto the top cover. Compared to assembling multiple individual poles onto the top cover one by one, this cover plate structure significantly reduces assembly steps, improves assembly efficiency, and lowers processing costs.

[0024] This utility model also provides a battery cell, including a housing and the aforementioned cover structure, the cover structure being disposed over the opening of the housing. This battery cell can improve assembly efficiency and reduce processing costs while helping to increase current carrying capacity. Attached Figure Description

[0025] Figure 1 This is a first-view structural schematic diagram of the cover plate structure provided in this embodiment of the utility model;

[0026] Figure 2 This is a second-view structural schematic diagram of the cover plate structure provided in this embodiment of the utility model;

[0027] Figure 3 This is an exploded view of the cover plate structure provided in this embodiment of the utility model;

[0028] Figure 4 This is a cross-sectional view of the cover plate structure provided in this embodiment of the utility model;

[0029] Figure 5 This is a partially enlarged cross-sectional view of the cover plate structure provided in this embodiment of the utility model.

[0030] In the picture:

[0031] 1. Top cover; 11. First through hole;

[0032] 2. Pole post; 21. Base plate; 22. Column body; 221. Riveted protrusion;

[0033] 3. Riveting block; 31. Receiving groove; 32. Second through hole;

[0034] 4. Adapter ring; 41. Annular part; 42. Tubular part;

[0035] 5. Sealing ring; 6. Upper plastic; 7. Lower plastic. Detailed Implementation

[0036] The technical solution of this utility model will be further described below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely for explaining this utility model and not for limiting it. Furthermore, it should be noted that, for ease of description, only the parts related to this utility model are shown in the drawings, not all of them.

[0037] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections or detachable connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0038] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature 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 includes the first feature 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.

[0039] The cover structure of a battery cell includes terminals. To improve the current-carrying capacity of the cover structure, the diameter of the terminals needs to be increased. However, for blade batteries, the top cover of the cover structure is long and narrow, and the increase in the terminal diameter is limited by the width of the top cover. The current-carrying capacity of the cover structure of blade batteries can be improved by increasing the number of terminals and rationally designing their positions. However, setting multiple individual terminals increases assembly steps, increases processing costs, and reduces assembly efficiency.

[0040] This embodiment provides a cover plate structure to solve the above problems. This cover plate structure can improve assembly efficiency and reduce processing costs while helping to improve flow capacity.

[0041] like Figures 1-5As shown, the cover structure of this embodiment includes a top cover 1, an electrode post 2, and a riveting block 3. The top cover 1 has N first through holes 11, where N is a positive integer greater than 1. The electrode post 2 includes a base plate 21 and N columnar portions 22, each connected to the base plate 21. The N columnar portions 22 are correspondingly inserted through the N first through holes 11. The base plate 21 is located on the side of the top cover 1 facing the inside of the battery cell. The riveting block 3 is located on the side of the top cover 1 facing the outside of the battery cell. The N columnar portions 22 are fixed to the riveting block 3 by riveting deformation.

[0042] By connecting N column parts 22 to a base plate 21, multiple column parts 22 can be assembled onto the top cover 1 in one step. Then, the column parts 22 can be riveted to fix the pole post 2 onto the top cover 1. Compared with assembling multiple individual pole posts 2 onto the top cover 1 one by one, this cover plate structure greatly reduces the assembly steps, improves assembly efficiency, and reduces processing costs.

[0043] Optionally, the riveting block 3 has N receiving grooves 31 on its end face facing the outside of the battery cell. Each receiving groove 31 has a second through hole 32 at its bottom. The N cylindrical parts 22 are correspondingly inserted into the N second through holes 32, and the riveting protrusion 221 is located inside the receiving groove 31. To ensure that the riveting protrusion 221 does not detach from the riveting block 3, the inner diameter of the second through hole 32 of the riveting block 3 is smaller than the outer diameter of the riveting protrusion 221, so as to ensure that the riveting protrusion 221 does not detach from the receiving groove 31.

[0044] Optionally, the riveting protrusion 221 is located at the end of the column portion 22 away from the base plate 21. The column portion 22 includes a neck and a main body. The neck connects to the riveting protrusion 221, and the main body is located between the neck and the base plate 21. The outer diameter of the main body is larger than the outer diameter of the neck. The neck is located at the second through hole 32, meaning that the riveting protrusion 221 indirectly abuts against the bottom of the receiving groove 31. At the same time, the main body abuts against the end face of the rivet block 3 facing the inside of the battery cell, and the rivet block 3 is locked by the column portion 22 of the pole post 2. Simultaneously, the riveting protrusion 221 of the pole post 2 also presses each component onto the top cover 1.

[0045] Therefore, in order to increase the contact area between the column portion 22 and the riveting block 3 after riveting, and improve the structural strength at this point to ensure the overall structural strength of the cover plate structure, the cover plate structure may optionally include N transition rings 4. The N transition rings 4 are fitted one-to-one on the N column portions 22, and each transition ring 4 is sandwiched between the riveting protrusion 221 of the corresponding column portion 22 and the riveting block 3.

[0046] Optionally, each adapter ring 4 includes an annular portion 41, which is sandwiched between the bottom of the receiving groove 31 and the end face of the riveting protrusion 221 facing the inside of the battery cell.

[0047] Optionally, each adapter ring 4 includes a tubular portion 42, which is sandwiched between the groove wall of the receiving groove 31 and the outer wall of the riveting protrusion 221. The tubular portion 42 is connected to the outer ring of the annular portion 41 and protrudes outward toward the outside of the battery cell, meaning the adapter ring 4 is entirely attached to the receiving groove 31. By providing the adapter ring 4, the area of ​​the riveting protrusion 221 pressing against the bottom of the receiving groove 31 is increased. If the adapter ring 4 is not provided, simply increasing the radial protrusion size of the riveting protrusion 221 would increase the riveting difficulty and be detrimental to the structural strength of the riveting protrusion 221. If the adapter ring 4 is not provided and the radial protrusion size of the riveting protrusion 221 is not increased, the contact area between the riveting protrusion 221 and the receiving groove 31 would be small, which would be detrimental to a firm connection between the two.

[0048] Optionally, the tubular portion 42 is welded to the riveted protrusion 221 to further ensure a secure connection between the pole post 2 and the adapter ring 4.

[0049] Optionally, in this embodiment, both the pole 2 and the adapter ring 4 are made of pure copper to improve welding quality. Optionally, the riveting block 3 is made of aluminum and is used for welding to the external ferrule. When there is moisture in the environment, copper and aluminum are prone to galvanic corrosion, with aluminum being the preferred material due to its lower potential. After corrosion of the aluminum riveting block 3, the size of the second through hole 32 may increase. If the adapter ring 4 is not provided, the copper pole 2 may detach from the riveting block 3. Therefore, an adapter ring 4 made of the same material as the pole 2 is provided to increase the stress area between the pole 2 and the riveting block 3, ensuring the reliability of the riveting structure.

[0050] Optionally, in this embodiment, the cross-section of the column portion 22 is circular, the outer wall of the riveting protrusion 221 is an annular curved surface, the receiving groove 31 is a circular groove, the annular portion 41 is an annular shape, and the cross-section of the tubular portion 42 is also circular.

[0051] Optionally, in this embodiment, in order to accommodate the narrow top cover 1, the rivet block 3 is a cuboid, and the base plate 21 of the pole post 2 is also a rectangular plate.

[0052] Optionally, the outer wall of the tubular portion 42 is attached to the inner wall of the receiving groove 31, and the outer wall of the riveting protrusion 221 is attached to the inner wall of the tubular portion 42. Optionally, the end face of the tubular portion 42 facing the outside of the battery cell is flush with the end face of the riveting protrusion 221 facing the outside of the battery cell to facilitate welding operations. Optionally, the end face of the tubular portion 42 facing the outside of the battery cell is flush with the end face of the riveting block 3 facing the outside of the battery cell to facilitate riveting the end of the column portion 22, forming a radially protruding riveting protrusion 221.

[0053] Optionally, the annular portion 41 and the cylindrical portion 22 are coaxially arranged, and the width 'a' of the annular portion 41 along its radial direction satisfies: 1mm ≤ a ≤ 2mm. It should be noted that the width 'a' of the annular portion 41 is the distance between the inner ring of the annular portion 41 and the outer wall of the tubular portion 42, i.e., the radial dimension of the contact surface between the transition ring 4 and the bottom of the receiving groove 31. If the value of 'a' is less than 1mm, the bonding strength between the riveting protrusion 221 of the pole post 2 and the riveting block 3 is still relatively small, and during electrochemical corrosion, i.e., when the inner diameter of the second through hole 32 increases, the riveting protrusion 221 may still detach from the riveting block 3, causing the entire cover structure to become loose, potentially leading to current conduction failure, sealing failure, and insulation failure. If the value of 'a' is greater than 2mm, when the width of the riveting block 3 remains unchanged, the portion of the riveting block 3 located at the edge of the receiving groove 31 will be too narrow, affecting the local structural strength.

[0054] Optionally, the value of 'a' can be 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, or 2mm.

[0055] Optionally, along the axial direction of the column portion 22, the height c of the riveting protrusion 221 satisfies: 0.8mm ≤ c ≤ 2mm. If the value of c is less than 0.8mm, the structural strength of the riveting protrusion 221 is too low, and it is easily deformed under stress, resulting in the overall cover plate structure not being tightly pressed, and there is a risk of displacement of various components. If the value of c is greater than 2mm, the riveting protrusion 221 is too high, which on the one hand increases the difficulty of riveting and causes incomplete riveting; on the other hand, if the thickness of the riveting block 3 remains unchanged, the thickness of the bottom of the receiving groove 31 will decrease, resulting in insufficient structural strength of the bottom of the receiving groove 31.

[0056] Optionally, the value of c can be 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm or 2mm.

[0057] Optionally, along the axial direction of the column portion 22, the weld penetration depth b between the tubular portion 42 and the riveting protrusion 221 and the height c of the riveting protrusion 221 satisfy the following condition: 0.3mm ≤ b ≤ 0.85c. If the weld penetration depth b is less than 0.3mm, the weld strength is insufficient, and the internal resistance between the pole post 2 and the transition ring 4 is too large. If the weld penetration depth b is greater than 0.85 times the height of the riveting protrusion 221, the weld penetration depth b is too deep, which can easily cause weld bursts. In severe cases, the riveting protrusion 221 may be melted, affecting the structural strength at this point, and even causing the entire cover plate structure to become loose.

[0058] Optionally, when the value of c is 2mm, the value of b can be 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm or 1.7mm.

[0059] To ensure the sealing performance of the cover plate structure, the cover plate structure may optionally include N sealing rings 5, which are fitted one-to-one on the N column parts 22. The sealing rings 5 ​​are partially sandwiched between the end face of the bottom plate 21 facing the outside of the battery cell and the end face of the top cover 1 facing the inside of the battery cell.

[0060] Optionally, the cover structure also includes an upper plastic 6, which is partially sandwiched between the rivet block 3 and the top cover 1. The upper plastic 6 has sides to wrap around the sidewalls of the rivet block 3. The upper plastic 6 also has N protruding rings facing the inside of the battery cell. The N protruding rings are fitted one-to-one onto the N column portions 22 and inserted one-to-one into the N first through holes 11. Each protruding ring is sandwiched between the inner wall of the first through hole 11 and the column portion 22 to ensure insulation between the electrode post 2 and the top cover 1.

[0061] Optionally, in this embodiment, the end face of the protruding ring facing the inside of the battery cell abuts against the end face of the sealing ring 5 facing the outside of the battery cell, that is, the sealing ring 5 can block the gap between the protruding ring and the inner wall of the first through hole 11.

[0062] Optionally, the cover structure also includes a lower plastic 7, which is attached to the side of the top cover 1 facing the inside of the battery cell, and the lower plastic 7 is partially sandwiched between the bottom plate 21 and the top cover 1 to ensure insulation between the two. Optionally, the sealing ring 5 is located in the through hole of the lower plastic 7.

[0063] like Figure 5 As shown, to ensure the effectiveness of the seal, optionally, before the sealing ring 5 is compressed, the width e of the sealing ring 5, sandwiched between the end face of the base plate 21 facing the outside of the battery cell and the end face of the top cover 1 facing the inside of the battery cell, along the radial direction of the column portion 22, satisfies: 0.5mm ≤ e ≤ 1.5mm. It should be noted that the annular region of the outer ring of the sealing ring 5, sandwiched between the end face of the base plate 21 facing the outside of the battery cell and the end face of the top cover 1 facing the inside of the battery cell, has a radial width e along its annular region.

[0064] If the value of e is less than 0.5 mm, the sealing ring 5 is prone to failure when there are processing and assembly errors. If the value of e is greater than 1.5 mm, on the one hand, it will encroach on the space in the width direction of the top cover 1, making the edge of the through hole of the lower plastic 7 too narrow at both ends in the width direction, and the local structural strength of the lower plastic 7 is too low, making it easy to be misaligned under force. On the other hand, if the value of e is too large, the spring force of the sealing ring 5 on the pole post 2 will also increase, and the force on the riveting protrusion 221 towards the inside of the cell will increase. The riveting protrusion 221 may deform under a large force, causing other components to loosen, and even the pole post 2 may fail.

[0065] Optionally, the value of e can be 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm or 1.5mm.

[0066] Optionally, along the axial direction of the column portion 22, the thickness d of the compressed sealing ring 5, sandwiched between the end face of the base plate 21 facing the outside of the battery cell and the end face of the top cover 1 facing the inside of the battery cell, satisfies the following condition: 0.3mm ≤ d ≤ 1mm. If the thickness d of the compressed sealing ring 5 is less than 0.3mm, air breakdown is likely to occur between the top cover 1 and the terminal post 2. If the thickness d of the compressed sealing ring 5 is greater than 1mm, it will encroach on the height space of the battery cell, which is not conducive to the utilization of the battery cell capacity, and the thickness of the lower plastic 7 also needs to be increased accordingly, which will increase the cost.

[0067] Optionally, the value of d can be 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm or 1mm.

[0068] Optionally, in this embodiment, N is 2, and the two columnar portions 22 are spaced apart along the length of the top cover 1 to accommodate the narrow top cover 1 of the blade battery cell. Of course, in other embodiments, N can also be 3, 4, 5, 6, 7, or other larger positive integers.

[0069] Optionally, the aforementioned terminal 2 can be a positive terminal, and a negative terminal can be additionally provided on the top cover 1; or the aforementioned terminal 2 can be a negative terminal, and a positive terminal can be additionally provided on the top cover 1. Alternatively, the cover structure may have only one terminal 2, while the battery cell may have two cover structures, with the terminals 2 of the two cover structures being the positive terminal and the negative terminal, respectively.

[0070] This embodiment also provides a battery cell, including a housing and the aforementioned cover structure, the cover structure being disposed over the opening of the housing. This battery cell can improve assembly efficiency and reduce processing costs while helping to increase current carrying capacity.

[0071] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A cover plate structure, characterized in that, include: The top cover (1) has N first through holes (11), where N is a positive integer greater than 1; The pole post (2) includes a base plate (21) and N column parts (22) connected to the base plate (21). The N column parts (22) are respectively inserted through the N first through holes (11). The base plate (21) is located on the side of the top cover (1) facing the inside of the cell. The riveting block (3) is located on the side of the top cover (1) facing the outside of the battery cell, and the N column parts (22) are fixed to the riveting block (3) by riveting deformation.

2. The cover plate structure according to claim 1, characterized in that, It also includes N adapter rings (4), which are fitted one-to-one on the N column parts (22). Each adapter ring (4) is sandwiched between the riveting protrusion (221) of the corresponding column part (22) and the riveting block (3).

3. The cover plate structure according to claim 2, characterized in that, The riveting block (3) has N receiving grooves (31) on the end face facing the outside of the battery cell. Each receiving groove (31) has a second through hole (32) at the bottom. The N column parts (22) are correspondingly inserted into the N second through holes (32). Each adapter ring (4) includes an annular part (41). The annular part (41) is sandwiched between the bottom of the receiving groove (31) and the end face of the riveting protrusion (221) facing the inside of the battery cell.

4. The cover plate structure according to claim 3, characterized in that, The annular portion (41) is coaxially arranged with the column portion (22), and the width a of the annular portion (41) along the radial direction satisfies: 1mm≤a≤2mm.

5. The cover plate structure according to any one of claims 3-4, characterized in that, Each of the adapter rings (4) includes a tubular portion (42) sandwiched between the groove wall of the receiving groove (31) and the outer wall of the riveting protrusion (221).

6. The cover plate structure according to claim 5, characterized in that, The tubular portion (42) is welded to the riveting protrusion (221).

7. The cover plate structure according to claim 6, characterized in that, Along the axial direction of the column portion (22), the height c of the riveting protrusion (221) satisfies: 0.8mm≤c≤2mm; And / or, along the axial direction of the column portion (22), the weld penetration depth b of the tubular portion (42) and the riveting protrusion (221) and the height c of the riveting protrusion (221) satisfy: 0.3mm≤b≤0.85c.

8. The cover plate structure according to any one of claims 1-4, characterized in that, It also includes N sealing rings (5), and the N sealing rings (5) are fitted one-to-one on the N column parts (22). The sealing rings (5) are partially sandwiched between the end face of the bottom plate (21) facing the outside of the cell and the end face of the top cover (1) facing the inside of the cell.

9. The cover plate structure according to claim 8, characterized in that, Before the sealing ring (5) is compressed, the width e of the sealing ring (5) sandwiched between the end face of the bottom plate (21) facing the outside of the cell and the end face of the top cover (1) facing the inside of the cell along the radial direction of the column part (22) satisfies: 0.5mm≤e≤1.5mm; And / or, along the axial direction of the column portion (22), the thickness d of the sealing ring (5) sandwiched between the end face of the bottom plate (21) facing the outside of the cell and the end face of the top cover (1) facing the inside of the cell after compression satisfies: 0.3mm≤d≤1mm.

10. A battery cell, characterized in that, It includes a housing and a cover structure as described in any one of claims 1-9, the cover structure covering the opening of the housing.

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