Battery cover plate structure and battery

Abstract

The utility model relates to the technical field of lithium batteries, and discloses a battery cover plate structure and a battery, the battery cover plate structure comprises: a cover plate body provided with a first mounting hole; a connecting block; the pole component comprises a pole body and a pole bottom plate; one end of the pole body is suitable for penetrating through the first mounting hole and is riveted with the connecting block; an insulating component is arranged among the pole body, the connecting block and the cover plate body; the pole bottom plate is arranged on one side, far away from the cover plate body, of the pole body in the first direction, and the pole bottom plate is suitable for being welded with a pole lug; a second mounting hole is formed in the pole bottom plate; and the fastener penetrates through the second mounting hole along the first direction and is in threaded connection with the pole body. According to the battery cover plate structure provided by the utility model, the detachable connection between the pole bottom plate and the pole body is realized, the potential failure risk caused by welding between the pole bottom plate and the pole body is avoided, and the cover plate assembly can be reworked and disassembled by disassembling the fastener after the cover plate is assembled.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium batteries, in particular to a battery cover structure and a battery. Background Art

[0002] As lithium-ion battery technology matures, it is widely used as a power battery in electric vehicles and energy storage applications, leading to increasing demands for performance and safety. Lithium-ion battery covers are core components for safety and assembly, and their structural design is crucial to battery cell safety. However, existing lithium-ion battery cover plates connect the terminal column to the terminal base plate through welding, making weld defects difficult to detect and posing a potential risk of failure. Utility Model Content

[0003] In view of this, the utility model provides a battery cover structure and a battery to solve the problem that the existing lithium battery cover pole body and the pole base plate are connected by welding, welding defects are difficult to observe and identify, and there is a potential risk of failure.

[0004] In a first aspect, the present invention provides a battery cover structure, comprising:

[0005] The cover body is provided with a first mounting hole;

[0006] A connecting block is provided on one side of the cover body in the first direction;

[0007] The pole assembly includes a pole body and a pole base plate, wherein the pole body and the pole base plate are independently arranged;

[0008] One end of the pole body is adapted to pass through the first mounting hole and be riveted to the connection block; an insulating component is provided between the pole body, the connection block and the cover body;

[0009] The pole bottom plate is arranged on a side of the pole body away from the cover body along the first direction, and the pole bottom plate is suitable for welding with the pole ear; a second mounting hole is opened on the pole bottom plate;

[0010] The fastener passes through the second mounting hole along the first direction and is threadedly connected to the pole body. The fastener is suitable for detachably connecting the pole base plate and the pole body.

[0011] Beneficial effect: The battery cover structure provided in this embodiment has the pole bottom plate and the pole ear directly welded, and there is no need to set up additional parts such as connecting plates between the pole bottom plate and the pole ear for connection, which can not only achieve structural cost reduction, but also help to maximize the effective space inside the battery cell, thereby improving the volume energy density of the battery cell; one end of the pole body passes through the first mounting hole and is riveted to the connecting block, thereby simultaneously achieving the fixation of the insulating component and the insulation and sealing between the pole body and the connecting block and the cover body; the pole body and the pole bottom plate are arranged independently of each other, and the detachable connection between the pole bottom plate and the pole body is achieved by setting a fastener to pass through the second mounting hole and be threadedly connected to the pole body, which not only avoids the potential failure risk between the pole bottom plate and the pole body due to welding, but also the cover assembly can be reworked and disassembled by removing the fasteners after the cover is assembled, so as to facilitate repair and / or replacement of parts, which is beneficial to reduce the scrapping cost of the cover assembly.

[0012] In an optional embodiment, the pole body includes a column portion and a first step portion, the column portion is suitable for passing through the first mounting hole and riveted to the connecting block; the first step portion abuts against a side of the cover body away from the connecting block along the first direction, and the first step portion is suitable for fixing the pole body and the insulating assembly to the cover body together with the connecting block.

[0013] Beneficial effect: The pole body is connected with the connection block, the cover plate body and the insulation component to form an integral structural module, which facilitates the subsequent disassembly and connection of the pole body and the pole base plate through fasteners, and is conducive to simplifying the assembly process of the battery cell.

[0014] In an optional embodiment, the insulating assembly includes a sealing ring, which is coaxially arranged with the cylindrical portion; and the diameter of the first step portion is larger than the diameter of the sealing ring.

[0015] Beneficial effect: The risk of poor sealing of the cover is reduced.

[0016] In an optional embodiment, a first limiting groove is formed on one side of the pole bottom plate close to the pole body along the first direction; and the first step portion is installed in the first limiting groove.

[0017] Beneficial effect: It can not only enhance the radial connection strength between the pole bottom plate and the pole body, but also reduce the space occupied by the pole bottom plate and the pole body along the first direction, which is conducive to maximizing the effective space inside the battery cell, thereby improving the volume energy density of the battery cell.

[0018] In an optional embodiment, the distance between the bottom wall of the first limiting groove and the pole bottom plate away from the pole body along the first direction is L1, and L1 satisfies 0.5mm≤L2-L1≤1.5mm, where L2 is the total thickness of the pole bottom plate.

[0019] Beneficial effects: It can not only ensure the fixing strength between the pole bottom plate and the pole body, but also reduce the space occupied by the pole bottom plate and the pole body in the battery cell, thereby improving the space utilization rate inside the battery cell and reducing production costs.

[0020] In an optional embodiment, a threaded hole is formed on a side of the pole body away from the cover body, and the threaded hole is coaxially arranged with the second mounting hole;

[0021] The fastener includes a stud portion adapted to pass through the second mounting hole and be threadedly engaged with the threaded hole.

[0022] Beneficial effect: The detachable connection between the pole base plate and the pole body is achieved, which not only avoids the potential failure risk between the pole base plate and the pole body due to welding, but also allows the cover assembly to be reworked and disassembled by removing the fasteners after the cover is assembled, so as to facilitate maintenance and / or replacement of parts, which is conducive to reducing the scrapping cost of the cover assembly.

[0023] In an optional embodiment, the fastener further includes a second step portion connected to one end of the stud portion along the first direction;

[0024] The pole bottom plate includes a third step portion, which is arranged along the circumference of the second mounting hole; the third step portion is clearance-matched with the second step portion, and the thickness of the third step portion along the first direction is greater than or equal to the thickness of the second step portion along the first direction;

[0025] The fastener further includes a fourth step portion, which is arranged on a side of the second step portion away from the stud portion along the first direction, and is suitable for abutting against the third step portion along the first direction.

[0026] Beneficial effect: When the stud portion passes through the second mounting hole and is screwed together with the threaded hole, the fourth step portion abuts against the third step portion along the first direction, thereby fastening the pole base plate to the pole body. When the fastener is just tightened into place, the second step portion abuts against the side of the first step portion toward the pole base plate, thereby preventing the pole base plate from being deformed due to over-tightening, and at the same time ensuring the flow area between the pole base plate and the pole body.

[0027] In an optional embodiment, a rotation groove is formed on a side of the fourth step portion away from the second step portion along the first direction, and the rotation groove is suitable for providing an interface for an external tool to transmit torque to the fastener.

[0028] Beneficial effect: It is convenient to use a tool such as a screwdriver to screw the fastener through the rotating groove, thereby facilitating the assembly and disassembly of the fastener.

[0029] In an optional embodiment, a second limiting groove is formed on a side of the pole bottom plate away from the pole body along the first direction, and the second limiting groove is arranged along the circumference of the fourth step portion;

[0030] The fourth step portion and the pole bottom plate are spot-welded in the second limiting groove to achieve position limiting.

[0031] Beneficial effect: This prevents the fasteners from loosening and / or falling off, and ensures the firmness and reliability of the connection between the pole bottom plate and the pole body by the fasteners.

[0032] In a second aspect, the present invention further provides a battery, comprising: an electrode group, and the battery cover structure as described above;

[0033] A pole lug is provided on one side of the pole group facing the battery cover structure, and the pole lug is suitable for welding to the pole bottom plate.

[0034] Beneficial effects: The battery of the second aspect includes the battery cover structure of the first aspect. Therefore, the battery of the second aspect includes all the beneficial effects of the battery cover structure of the first aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0036] Figure 1 This is an assembly diagram of a battery cover structure according to an embodiment of the present utility model;

[0037] Figure 2 This is a first exploded view of a battery cover structure according to an embodiment of the present utility model;

[0038] Figure 3 This is a second exploded view of a battery cover structure according to an embodiment of the present invention;

[0039] Figure 4 for Figure 1 Cross-sectional view of section AA;

[0040] Figure 5 for Figure 4 A partial enlarged schematic diagram of point B in the middle;

[0041] Figure 6 A cross-sectional view of a pole body of a battery cover structure according to an embodiment of the present utility model;

[0042] Figure 7A cross-sectional view of a pole bottom plate of a battery cover structure according to an embodiment of the present utility model;

[0043] Figure 8 A bottom view of a pole bottom plate of a battery cover structure according to an embodiment of the present invention;

[0044] Figure 9 This is a front view of a fastener of a battery cover structure according to an embodiment of the present utility model;

[0045] Figure 10 This is a first stereoscopic view of a battery cover structure according to an embodiment of the present invention, in which a pole body and a pole bottom plate are fixed by fasteners;

[0046] Figure 11 This is a second stereoscopic view of a battery cover structure according to an embodiment of the present invention, in which a pole body and a pole base are fixed by fasteners.

[0047] Description of reference numerals:

[0048] 10. Cover plate body; 101. First mounting hole;

[0049] 20. Connecting block;

[0050] 30. Pole assembly; 31. Pole body; 3101. Threaded hole; 311. Column; 312. First step; 32. Pole bottom plate; 3201. First limiting groove; 3202. Second limiting groove; 3203. Second mounting hole; 321. Third step;

[0051] 40. Insulation assembly; 41. Sealing ring; 42. First insulating member; 43. Second insulating member;

[0052] 50. Fastener; 501. Rotation groove; 51. Stud portion; 52. Second step portion; 53. Fourth step portion. DETAILED DESCRIPTION

[0053] In related technologies, friction welding is used for the pole body and the pole base plate. Welding defects are difficult to observe and identify, and there is a potential risk of failure. Moreover, the cover is generally difficult to disassemble and repair after assembly, and parts cannot be replaced, resulting in high costs for scrapping the cover assembly. In addition, the lithium battery cover is welded with two parts, the pole and the connecting plate, which takes up a relatively large space. The pole is machined as a whole, which not only has high processing costs but is also not conducive to automated production.

[0054] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0055] The following combination Figures 1 to 11 , describing the embodiments of the present utility model.

[0056] According to an embodiment of the present invention, on the one hand, a battery cover structure is provided, comprising:

[0057] Cover body 10, see Figure 2 and Figure 3 As shown, a first mounting hole 101 is provided thereon;

[0058] Connecting block 20, please combine together Figure 1 As shown, the connecting block 20 is provided on one side of the cover body 10 in the first direction;

[0059] The pole assembly 30 includes a pole body 31 and a pole base plate 32. The pole body 31 and the pole base plate 32 are independently provided. The pole body 31 and the pole base plate 32 adopt a split structure. The split parts can adopt a platform design, which is more conducive to achieving the demand for batch cost reduction.

[0060] One end of the pole body 31 along the first direction is adapted to pass through the first mounting hole 101 and be riveted to the connecting block 20; an insulating assembly 40 is provided between the pole body 31, the connecting block 20, and the cover body 10, and the insulating assembly 40 is adapted to insulate the pole body 31, the connecting block 20, and the cover body 10;

[0061] The pole bottom plate 32 is arranged on a side of the pole body 31 away from the cover body 10 along the first direction. The pole bottom plate 32 is suitable for welding with the pole tab 61. A second mounting hole 3203 is opened on the pole bottom plate 32.

[0062] The fastener 50 passes through the second mounting hole 3203 along the first direction and is threadedly connected to the pole body 31 . The fastener 50 is suitable for detachably connecting the pole base plate 32 to the pole body 31 .

[0063] The battery cover structure provided in this embodiment is that the pole bottom plate 32 is directly welded to the pole ear 61, and no additional parts such as connecting plates are required to connect the pole bottom plate 32 and the pole ear 61, which can not only achieve structural cost reduction, but also help to maximize the effective space inside the battery cell, thereby improving the volume energy density of the battery cell; one end of the pole body 31 passes through the first mounting hole 101 and is riveted to the connecting block 20, thereby simultaneously achieving the fixation of the insulating component 40 and the connection between the pole body 31 and the connecting block 20 and the cover body 10. Insulation and sealing; the pole body 31 and the pole base plate 32 are independently arranged, and a fastener 50 is provided to pass through the second mounting hole 3203 and be threadedly connected to the pole body 31, thereby realizing a detachable connection between the pole base plate 32 and the pole body 31, which not only avoids the potential failure risk between the pole base plate 32 and the pole body 31 due to welding, but also enables the cover assembly to be reworked and disassembled by removing the fastener 50 after the cover is assembled, so as to facilitate maintenance and / or replacement of parts, which is conducive to reducing the scrapping cost of the cover assembly.

[0064] Furthermore, the fastener 50 may be made of a material with excellent performance strength, such as stainless steel, to ensure its structural strength, thereby ensuring the yield of the battery cell.

[0065] Furthermore, the pole body 31 is a rotating body structure.

[0066] In some embodiments, see Figure 6 As shown, the pole body 31 includes a column portion 311 and a first step portion 312. Figure 4 and Figure 5 As shown, the column portion 311 is suitable for passing through the first mounting hole 101 and riveted to the connecting block 20; the first step portion 312 abuts against the side of the cover body 10 away from the connecting block 20 along the first direction, and the first step portion 312 is suitable for fixing the pole body 31 and the insulating assembly 40 to the cover body 10 together with the connecting block 20.

[0067] In this embodiment, the pole body 31 passes through the first mounting hole 101 through the column portion 311 and is riveted to the connecting block 20. At the same time, the pole body 31 is abutted against the side of the cover body 10 away from the connecting block 20 along the first direction through the first step portion 312, thereby connecting the pole body 31 with the connecting block 20, the cover body 10 and the insulating assembly 40 to form an integral structural module, which facilitates the subsequent disassembly and connection of the pole body 31 and the pole base plate 32 through the fastener 50, which is conducive to simplifying the assembly process of the battery cell.

[0068] Furthermore, the first step portion 312 is a rotating body structure.

[0069] In some embodiments, see Figure 4As shown, the insulating assembly 40 includes a sealing ring 41, which is coaxially arranged with the column portion 311. The sealing ring 41 is made of an insulating material and is suitable for sealing and insulating between the pole body 31 and the cover body 10. The diameter of the first step portion 312 is larger than the diameter of the sealing ring 41, thereby reducing the risk of poor sealing of the cover.

[0070] Further, see Figure 4 As shown, the insulating assembly 40 also includes a first insulating member 42 and a second insulating member 43. The first insulating member 42 is arranged between the connecting block 20 and the cover body 10, and the first insulating member 42 is suitable for insulating between the connecting block 20 and the cover body 10; the second insulating member 43 is arranged between the pole body 31 and the pole bottom plate 32 and the cover body 10, and the second insulating member 43 is suitable for sealing between the pole body 31 and the pole bottom plate 32 and the cover body 10.

[0071] In some embodiments, see Figure 7 As shown, the pole bottom plate 32 is provided with a first limiting groove 3201 on one side close to the pole body 31 along the first direction; Figure 1 and Figure 4 As shown, the first step portion 312 is installed in the first limiting groove 3201, which can not only enhance the radial connection strength between the pole bottom plate 32 and the pole body 31, but also reduce the space occupied by the pole bottom plate 32 and the pole body 31 along the first direction, which is conducive to maximizing the effective space inside the battery cell, thereby improving the volume energy density of the battery cell.

[0072] Furthermore, the first limiting groove 3201 is circular.

[0073] In some embodiments, see Figure 7 As shown, the distance between the bottom wall of the first limiting groove 3201 and the side of the pole bottom plate 32 away from the pole body 31 along the first direction is L1, and L1 satisfies 0.5mm≤L2-L1≤1.5mm, where L2 is the total thickness of the pole bottom plate 32.

[0074] It should be noted that L2-L1 is the depth of the first limiting groove 3201. The first step portion 312 is suitable for installation in the first limiting groove 3201. If the depth of the first limiting groove 3201 is too shallow, it is easy to reduce the fixing strength between the pole base plate 32 and the pole body 31. Therefore, L1 and L2 must meet the requirement of L2-L1≥0.5mm. If the depth of the first limiting groove 3201 is too deep, it means that the thickness of the first step portion 312 will increase. At the same time, to ensure the structural strength of the pole base plate 32, the thickness of the pole base plate 32 must also be increased accordingly. This will not only easily increase the space occupied by the pole base plate 32 and the pole body 31 in the battery cell, reducing the internal space utilization of the battery cell, but also easily increase the manufacturing cost of the pole base plate 32 and the pole body 31. Therefore, L1 and L2 must also meet the requirement of L2-L1≤1.5mm.

[0075] In this embodiment, L1 and L2 satisfy 0.5mm≤L2-L1≤1.5mm, where L1 is the distance between the bottom wall of the first limiting groove 3201 and the side of the pole bottom plate 32 away from the pole body 31 along the first direction, and L2 is the total thickness of the pole bottom plate 32. This can not only ensure the fixing strength between the pole bottom plate 32 and the pole body 31, but also reduce the space occupied by the pole bottom plate 32 and the pole body 31 in the battery cell, thereby improving the space utilization inside the battery cell and reducing the production cost.

[0076] In some embodiments, please combine Figure 4 and Figure 6 As shown, a threaded hole 3101 is formed on one side of the pole body 31 away from the cover body 10 , and the threaded hole 3101 is coaxially arranged with the second mounting hole 3203 ;

[0077] See Figure 9 As shown, the fastener 50 includes a stud portion 51 , which is adapted to pass through the second mounting hole 3203 and be threadedly engaged with the threaded hole 3101 .

[0078] In this embodiment, a threaded hole 3101 is opened on the pole body 31, and the stud portion 51 of the fastener 50 passes through the second mounting hole 3203 and is threadedly engaged with the threaded hole 3101, thereby achieving a detachable connection between the pole base plate 32 and the pole body 31. This not only avoids the potential failure risk between the pole base plate 32 and the pole body 31 due to welding, but also allows the cover assembly to be reworked and disassembled by removing the fastener 50 after the cover is assembled, so as to facilitate maintenance and / or replacement of components, which is beneficial to reducing the scrapping cost of the cover assembly.

[0079] In some embodiments, see Figure 9 As shown, the nominal diameter of the stud portion 51 is M, and M satisfies M≥2 mm.

[0080] It should be noted that if the nominal diameter of the stud portion 51 is too small, it will not only be difficult to process, but also easily reduce the structural strength of the stud portion 51, causing the stud portion 51 to break. Therefore, the nominal diameter M of the stud portion 51 must satisfy M≥2mm.

[0081] In some embodiments, see Figure 9 As shown, the fastener 50 further includes a second step portion 52, and the second step portion 52 is connected to one end of the stud portion 51 along the first direction;

[0082] See Figure 7 As shown, the pole bottom plate 32 includes a third step portion 321, and the third step portion 321 is arranged along the circumference of the second mounting hole 3203; Figure 5 As shown, the third step portion 321 is loosely fitted with the second step portion 52, and the thickness of the third step portion 321 along the first direction is greater than or equal to the thickness of the second step portion 52 along the first direction, so that the fastener 50 maintains fastening of the pole bottom plate 32 and the pole body 31, avoiding false contact or poor contact between the pole bottom plate 32 and the pole body 31;

[0083] The fastener 50 further includes a fourth step portion 53 , which is disposed on a side of the second step portion 52 away from the stud portion 51 along the first direction. The fourth step portion 53 is adapted to abut against the third step portion 321 along the first direction.

[0084] Preferably, the thickness of the third step portion 321 along the first direction is equal to the thickness of the second step portion 52 along the first direction, which can ensure the fastening of the fastener 50 to the pole base plate 32 and the pole body 31, while avoiding deformation of the pole base plate 32, and ensuring the flow area between the pole base plate 32 and the pole body 31.

[0085] In this embodiment, a second step portion 52 and a fourth step portion 53 are provided on the fastener 50, and a third step portion 321 is provided on the pole base plate 32. When the stud portion 51 passes through the second mounting hole 3203 and is screwed into the threaded hole 3101, the fourth step portion 53 abuts against the third step portion 321 along the first direction, thereby fastening the pole base plate 32 to the pole body 31. When the fastener 50 is just tightened into place, the second step portion 52 abuts against the side of the first step portion 312 toward the pole base plate 32, thereby preventing the pole base plate 32 from being deformed due to over-tightening, while ensuring the flow area between the pole base plate 32 and the pole body 31.

[0086] In some embodiments, see Figure 1As shown, a rotation groove 501 is provided on one side of the fourth step portion 53 away from the second step portion 52 along the first direction. The rotation groove 501 is suitable for providing an interface for an external tool to transmit torque to the fastener 50, thereby facilitating the use of tools such as a screwdriver to screw the fastener 50 through the rotation groove 501, thereby facilitating the assembly and disassembly of the fastener 50.

[0087] In some embodiments, please combine Figure 5 、 Figure 7 and Figure 11 As shown, a second limiting groove 3202 is formed on one side of the pole bottom plate 32 away from the pole body 31 along the first direction, and the second limiting groove 3202 is arranged along the circumference of the fourth step portion 53;

[0088] The fourth step portion 53 and the pole bottom plate 32 are spot-welded in the second limiting groove 3202 for position limiting, thereby preventing the fastener 50 from loosening and / or falling off, and ensuring the firmness and reliability of the fastener 50 in connecting the pole bottom plate 32 and the pole body 31.

[0089] It should be noted that the number of second limiting grooves 3202 can be one or more; during the manufacturing process, spot welding can be performed in a single second limiting groove 3202 or in multiple second limiting grooves 3202, both of which can achieve the limitation between the fourth step portion 53 and the pole bottom plate 32.

[0090] In some embodiments, see Figure 7 As shown, the depth of the second limiting groove 3202 is H, and H satisfies H≥0.5mm.

[0091] It should be noted that if the weld penetration between the fourth step 53 and the pole bottom plate 32 is too shallow, the weld strength between the fourth step 53 and the pole bottom plate 32 may be reduced, and there is a risk of the fastener 50 loosening and falling off. At the same time, the depth of the second limiting groove 3202 cannot be too shallow, otherwise the weld may easily protrude from the surface of the pole bottom plate 32, easily scratching the tab and / or insulating film. Therefore, the depth H of the second limiting groove 3202 must meet H ≥ 0.5 mm.

[0092] According to an embodiment of the present invention, on the other hand, a battery is provided, comprising: an electrode group, and the battery cover structure as described above;

[0093] A pole lug is provided on one side of the pole group facing the battery cover structure, and the pole lug is suitable for welding to the pole bottom plate 32 .

[0094] The battery provided in this embodiment includes the above-mentioned battery cover structure. Therefore, the battery in this embodiment includes all the beneficial effects of the above-mentioned battery cover structure.

[0095] Although the embodiments of the present invention have been described with reference to the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations shall fall within the scope defined by the appended claims.

Claims

1. A battery cover structure, characterized in that: include: The cover body is provided with a first mounting hole; A connecting block is provided on one side of the cover body in the first direction; The pole assembly comprises a pole body and a pole base plate, wherein the pole body and the pole base plate are independently arranged; One end of the pole body is adapted to pass through the first mounting hole and be riveted to the connecting block; an insulating component is provided between the pole body, the connecting block and the cover body; The pole bottom plate is arranged on a side of the pole body away from the cover body along the first direction, and the pole bottom plate is suitable for welding with the pole tab; a second mounting hole is opened on the pole bottom plate; A fastener passes through the second mounting hole along a first direction and is threadedly connected to the pole body, wherein the fastener is suitable for detachably connecting the pole base plate to the pole body.

2. The battery cover structure according to claim 1, characterized in that: The pole body includes a column portion and a first step portion, the column portion is suitable for passing through the first mounting hole and riveted to the connecting block; the first step portion abuts against a side of the cover body away from the connecting block along the first direction, and the first step portion is suitable for jointly fixing the pole body and the insulating assembly to the cover body with the connecting block.

3. The battery cover structure according to claim 2, characterized in that: The insulating assembly includes a sealing ring, which is coaxially arranged with the column portion; the diameter of the first step portion is greater than the diameter of the sealing ring.

4. The battery cover structure according to claim 2, characterized in that: A first limiting groove is formed on one side of the pole bottom plate close to the pole body along a first direction; and the first step portion is installed in the first limiting groove.

5. The battery cover structure according to claim 4, characterized in that: The distance between the bottom wall of the first limiting groove and the pole bottom plate away from the pole body along the first direction is L1, and L1 satisfies 0.5mm≤L2-L1≤1.5mm, wherein L2 is the total thickness of the pole bottom plate.

6. The battery cover structure according to any one of claims 2 to 5, characterized in that: A threaded hole is formed on a side of the pole body away from the cover body, and the threaded hole is coaxially arranged with the second mounting hole; The fastener includes a stud portion adapted to pass through the second mounting hole and be threadedly engaged with the threaded hole.

7. The battery cover structure according to claim 6, characterized in that: The fastener further includes a second step portion connected to one end of the stud portion along the first direction; The pole bottom plate includes a third step portion, which is arranged along the circumference of the second mounting hole; the third step portion is clearance-matched with the second step portion, and the thickness of the third step portion along the first direction is greater than or equal to the thickness of the second step portion along the first direction; The fastener further includes a fourth step portion, which is provided on a side of the second step portion away from the stud portion along the first direction, and is adapted to abut against the third step portion along the first direction.

8. The battery cover structure according to claim 7, characterized in that: A rotation groove is formed on a side of the fourth step portion away from the second step portion along the first direction, and the rotation groove is suitable for providing an interface for an external tool to transmit torque to the fastener.

9. The battery cover structure according to claim 7, characterized in that: A second limiting groove is formed on a side of the pole bottom plate away from the pole body along the first direction, and the second limiting groove is arranged along the circumference of the fourth step portion; The fourth step portion and the pole bottom plate are spot-welded in the second limiting groove to achieve position limiting.

10. A battery, characterized in that: include: A pole group, and a battery cover structure as claimed in any one of claims 1 to 9; A pole lug is provided on one side of the pole group facing the battery cover structure, and the pole lug is suitable for being welded to the pole bottom plate.

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