Battery cover plate and assembly process of battery cover plate

Abstract

The invention belongs to the technical field of batteries, and discloses a battery cover plate and an assembly process of the battery cover plate, the battery cover plate comprises a cover plate body, a connecting piece, a pole and an elastic snap ring, the cover plate body is provided with a first insertion through hole, the connecting piece is provided with a second insertion through hole, the inner wall of the second insertion through hole is provided with a first clamping groove, the pole comprises a first inserting part with a second clamping groove formed in the outer side wall, the first inserting part is inserted into the second inserting through hole, the second clamping groove and the first clamping groove jointly form a closed annular cavity, a compression notch is formed in the elastic clamping ring, the thickness size of the elastic clamping ring in the first direction is m, the groove depth size of the first clamping groove in the first direction is b, and the thickness size of the elastic clamping ring in the second direction is m; m is larger than b, and the elastic clamping ring is contained in the annular cavity and has the movement tendency of abutting against the inner wall of the first clamping groove all the time. Compared with the prior art, the fixed connection between the pole and the connecting piece is realized by using the elastic snap ring, so that the problem of uneven riveting expansion is avoided, and the assembly precision and the assembly yield are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to a battery cover plate and an assembly process of the battery cover plate. Background Art

[0002] As lithium-ion battery technology becomes increasingly mature, lithium-ion batteries are widely used as power batteries in electric vehicles and energy storage fields. The requirements for the performance and safety of lithium-ion batteries are increasing. The lithium battery cover is a key accessory in lithium-ion batteries. Its function is to weld with the shell to form a sealed cavity, lead the positive and negative electrodes of the electrode group, and serve as an assembly carrier. The traditional cover consists of a riveted block, an upper plastic, a pole, a top cover sheet, a lower plastic, a sealing ring and other structures.

[0003] The battery cover currently assembled by riveting has a main principle that the pole is expanded by riveting to realize the assembly of riveting blocks, poles, top cover sheets, upper plastic, lower plastic and sealing rings. However, after riveting, it is very easy to have uneven expansion of materials, which leads to deformation of the top cover sheet, dimensional deviation, poor assembly accuracy and low assembly yield. Summary of the invention

[0004] The object of the present invention is to provide a battery cover plate and an assembly process of the battery cover plate, which avoids the problem of uneven riveting and material expansion, and has high assembly accuracy and assembly yield.

[0005] To achieve this object, the present invention adopts the following technical solutions:

[0006] In one aspect, a battery cover is provided, the battery cover comprising:

[0007] A cover body, wherein a first plug-in through hole is formed on the cover body;

[0008] A connecting member, the connecting member is arranged at one side of the cover body and is provided with a second plugging through hole connected with the first plugging through hole, and a first card slot is provided on the inner wall of the second plugging through hole;

[0009] A pole, the pole comprising a first plug-in portion, a second plug-in portion and a limiting portion, the outer wall of the first plug-in portion is provided with a second slot, the first plug-in portion is inserted into the second plug-in through hole, the second slot and the first slot together form a closed annular cavity, the second plug-in portion is inserted into the first plug-in through hole, and the limiting portion is located on a side of the cover body away from the connector;

[0010] An elastic snap ring, wherein a compression notch is provided on the elastic snap ring, a thickness dimension of the elastic snap ring along a first direction is m, a groove depth dimension of the first groove along the first direction is b, and m>b is satisfied, the elastic snap ring is accommodated in the annular cavity, and has a movement tendency to always press against the inner wall of the first groove.

[0011] Optionally, a thickness dimension m of the elastic snap ring along the first direction and a groove depth dimension b of the first snap groove along the first direction satisfy 0.4m≤b≤0.6m.

[0012] Optionally, a groove depth dimension of the second slot along the first direction is c, and satisfies m≤c.

[0013] Optionally, a height dimension of the first clamping groove along the second direction is a1, a thickness dimension of the elastic clamping ring along the second direction is n, and 0.02mm≤a1-n≤0.06mm is satisfied.

[0014] Optionally, a height dimension of the second slot along the second direction is a2, and satisfies 0.02mm≤a2-n≤0.06mm.

[0015] Optionally, a height dimension a1 of the first card slot along the second direction and a height dimension a2 of the second card slot along the second direction satisfy a1=a2.

[0016] Optionally, a diameter dimension of the first card slot is k, a diameter dimension of the first plug-in portion along the first direction is f, and 0.05mm≤k-2b-f≤0.1mm is satisfied.

[0017] Optionally, the battery cover also includes a first insulating member and a second insulating member, the first insulating member is provided with a first mounting groove and is arranged on the side of the cover body facing the connecting member, the connecting member is accommodated in the first mounting groove, the second insulating member is provided with a second mounting groove and is arranged on the side of the cover body away from the first insulating member, and the limiting portion is accommodated in the second mounting groove.

[0018] Optionally, the battery cover also includes a seal, which includes a first sealing portion and a second sealing portion, the first sealing portion is clamped between the second plug-in portion and the inner wall of the first plug-in through hole, and the second sealing portion is clamped between the limiting portion and the bottom surface of the cover body facing the limiting portion.

[0019] On the other hand, a battery cover assembly process is provided, wherein the battery cover assembly process is used to assemble the battery cover as described in any one of the above items, and the battery cover assembly process comprises the following steps:

[0020] S1, assembling the first insulating member, the second insulating member and the sealing member with the cover plate body;

[0021] S2, passing the pole through the sealing member, the second insulating member, the cover body and the first insulating member in sequence, so that the first plug-in portion passes through the first insulating member;

[0022] S3, sleeve the elastic snap ring inside the first plug-in portion, and compress the elastic snap ring toward the first plug-in portion so that the elastic snap ring is accommodated in the second slot;

[0023] S4, sleeve the connector onto the first plug-in portion through the second plug-in through hole, and move the connector in a direction close to the cover body, until the surface of the first plug-in portion facing away from the cover body is flush with the surface of the connector facing away from the cover body, the first clamping groove and the second clamping groove together form the annular cavity, and the elastic clamping ring loses its restriction and abuts against the inner wall of the first clamping groove;

[0024] S5. Welding the connecting piece to the first plug-in portion.

[0025] Beneficial effects of the present invention:

[0026] The present invention provides a battery cover including a cover body, a connector, a pole and an elastic snap ring. A first snap groove is provided on the inner wall of a second plug-in through hole of the connector, and a second snap groove is provided on the outer wall of a first plug-in portion of the pole, so that the first snap groove and the second snap groove together constitute an annular cavity for accommodating the elastic snap ring. Since a thickness dimension m of the elastic snap ring along a first direction is greater than a groove depth dimension b of the first snap groove along the first direction, and the elastic snap ring accommodated in the annular cavity has a movement tendency to always press against the inner wall of the first snap groove, so that when the elastic snap ring presses against the inner wall of the first snap groove, a part of the elastic snap ring is located in the first snap groove, and another part of the elastic snap ring is located in the second snap groove, so that the first plug-in portion of the pole and the connector are fixedly connected by the elastic snap ring. Compared with the riveting method, the problem of uneven material expansion due to riveting is avoided, and the assembly accuracy and assembly yield are improved.

[0027] The present invention also provides a battery cover assembly method, by which the battery cover assembly method is used to assemble the battery cover without the need for riveting, thereby simplifying the assembly process, reducing the difficulty of assembly, and improving the efficiency of assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is a structural cross-sectional view of a battery cover provided by the present invention;

[0029] Figure 2 yes Figure 1A magnified view of the structure of part A;

[0030] Figure 3 It is a structural cross-sectional view of a connecting piece in a battery cover provided by the present invention;

[0031] Figure 4 It is a structural cross-sectional view of a pole in a battery cover provided by the present invention;

[0032] Figure 5 It is a structural cross-sectional view of the elastic clamp in the battery cover provided by the present invention;

[0033] Figure 6 It is a top view of the elastic clamp ring in the battery cover provided by the present invention.

[0034] In the figure:

[0035] 1. Cover plate body;

[0036] 2. Connecting piece; 21. Second plug-in through hole; 22. First card slot;

[0037] 3. Pole; 31. First plug-in portion; 32. Second plug-in portion; 33. Position-limiting portion; 34. Second slot;

[0038] 4. Elastic snap ring; 41. Compression notch;

[0039] 5. A first insulating member;

[0040] 6. A second insulating member;

[0041] 7. Sealing member; 71. First sealing portion; 72. Second sealing portion. DETAILED DESCRIPTION

[0042] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0043] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0044] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0045] In the description of this embodiment, the terms "upper", "lower", "right", etc., directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0046] Since the battery cover is assembled by riveting, there is a problem of uneven riveting material expansion, which may cause the top cover to deform and exceed the size, resulting in low assembly accuracy and yield after assembly.

[0047] Therefore, in order to avoid deformation of the top cover plate after assembly, dimensional deviation and other problems, and to improve the assembly accuracy and the product yield after assembly, this embodiment provides a battery cover plate.

[0048] like Figures 1 to 6 As shown, the battery cover includes a cover body 1, a connector 2, a pole 3 and an elastic snap ring 4. The cover body 1 is provided with a first plug-in through hole. The connector 2 is arranged on one side of the cover body 1 and is provided with a second plug-in through hole 21 connected to the first plug-in through hole. The inner wall of the second plug-in through hole 21 is provided with a first card slot 22. The pole 3 includes a first plug-in portion 31, a second plug-in portion 32 and a limiting portion 33. The outer wall of the first plug-in portion 31 is provided with a second card slot 34. The first plug-in portion 31 is inserted into the second plug-in portion 32. In the plug-in through hole 21, the second card groove 34 and the first card groove 22 together constitute a closed annular cavity, the second plug-in portion 32 is inserted in the first plug-in through hole, the limiting portion 33 is located on the side of the cover body 1 away from the connecting member 2, and a compression notch 41 is opened on the elastic snap ring 4. The thickness dimension of the elastic snap ring 4 along the first direction is m, and the groove depth dimension of the first card groove 22 along the first direction is b, and m>b is satisfied. The elastic snap ring 4 is accommodated in the annular cavity and has a movement tendency to always press against the inner wall of the first card groove 22.

[0049] By opening a first clamping groove 22 on the inner wall of the second plug-in hole 21 of the connector 2, and opening a second clamping groove 34 on the outer wall of the first plug-in portion 31 of the pole 3, the first clamping groove 22 and the second clamping groove 34 together constitute an annular cavity for accommodating the elastic clamping ring 4. Since the thickness dimension m of the elastic clamping ring 4 along the first direction is greater than the groove depth dimension b of the first clamping groove 22 along the first direction, and the elastic clamping ring 4 accommodated in the annular cavity has a movement tendency to always press against the inner wall of the first clamping groove 22, so that the elastic clamping ring 4 presses against the inner wall of the first clamping groove 22, a part of the elastic clamping ring 4 is located in the first clamping groove 22, and the other part of the elastic clamping ring 4 is located in the second clamping groove 34, so that the first plug-in portion 31 of the pole 3 is fixedly connected to the connector 2 by the elastic clamping ring 4. Compared with the riveting method, the problem of uneven riveting material expansion is avoided, and the assembly accuracy and assembly yield are improved.

[0050] The elastic snap ring 4 is an alloy steel or other steel material with strong mechanical properties and has a large tangential elastic force. A compression notch 41 is provided on the elastic snap ring 4 to facilitate compression of the elastic snap ring 4 and facilitate assembly. In order to ensure that the elastic snap ring 4 is tightly pressed against the inner wall of the first slot 22 after assembly, the outer diameter of the elastic snap ring 4 when not compressed needs to be larger than the diameter of the first slot 22. In addition, the battery cover of this structure can be applied to different types of batteries, such as square shell batteries, blade batteries or large cylindrical batteries.

[0051] Alternatively, if Figure 3 and Figure 5 As shown, the thickness dimension m of the elastic snap ring 4 along the first direction and the groove depth dimension b of the first groove 22 along the first direction satisfy 0.4m≤b≤0.6m. Since a part of the elastic snap ring 4 accommodated in the annular cavity is located in the first groove 22 and the other part is located in the second groove 34, the relationship between the thickness dimension m of the elastic snap ring 4 along the first direction and the groove depth dimension b of the first groove 22 along the first direction is limited so that the two satisfy 0.4m≤b≤0.6m, thereby ensuring that there is sufficient contact area between the elastic snap ring 4 and the first groove 22 to ensure the stability of the connection, wherein b=0.5m is preferably selected, thereby ensuring that when the elastic snap ring 4 abuts against the inner wall of the first groove 22, the thickness of the elastic snap ring 4 in the first groove 22 along the first direction is equal to the thickness of the elastic snap ring 4 in the second groove 34 along the first direction, thereby ensuring that the elastic snap ring 4 is subjected to uniform force and meeting the requirements of the push and pull force on the pole 3.

[0052] Alternatively, if Figure 4 and Figure 5As shown, the groove depth dimension of the second clamping groove 34 along the first direction is c, and satisfies m≤c. By limiting the groove depth dimension c of the second clamping groove 34 along the first direction so that it satisfies m≤c, it is convenient to completely compress the elastic snap ring 4 into the second clamping groove 34 during assembly, so as to facilitate the connection member 2 to be sleeved on the pole 3 equipped with the elastic snap ring 4 through the second plug-in through hole 21, so as to complete the connection and fixation between the connection member 2 and the first plug-in portion 31 of the pole 3 through the elastic snap ring 4.

[0053] Alternatively, if Figure 3 and Figure 5 As shown, the height dimension of the first clamping groove 22 along the second direction is a1, and the thickness dimension of the elastic clamping ring 4 along the second direction is n, and they satisfy 0.02mm≤a1-n≤0.06mm. By limiting the relationship between the height dimension a1 of the first clamping groove 22 along the second direction and the dimension n of the elastic clamping ring 4 along the second direction, the two satisfy 0.02mm≤a1-n≤0.06mm, thereby ensuring that the elastic clamping ring 4 is clearance-matched with the first clamping groove 22 in the second direction, so as to facilitate the assembly of the elastic clamping ring 4 into the first clamping groove 22.

[0054] Among them, the difference between the height dimension a1 of the first clamping groove 22 along the second direction and the dimension n of the elastic clamping ring 4 along the second direction can be any value between 0.02mm and 0.06mm or a range between any two values, such as 0.02mm, 0.03mm, 0.04mm, 0.05mm, 0.06mm, etc.

[0055] Alternatively, if Figure 4 and Figure 5 As shown, the height dimension of the second clamping groove 34 along the second direction is a2, and satisfies 0.02mm≤a2-n≤0.06mm. By limiting the relationship between the height dimension a2 of the second clamping groove 34 along the second direction and the dimension n of the elastic clamping ring 4 along the second direction, the two satisfy 0.02mm≤a2-n≤0.06mm, thereby ensuring that the elastic clamping ring 4 is clearance-matched with the second clamping groove 34 in the second direction, thereby facilitating the assembly of the elastic clamping ring 4 into the second clamping groove 34.

[0056] Among them, the difference between the height dimension a2 of the second slot 34 along the second direction and the dimension n of the elastic snap ring 4 along the second direction can be any value between 0.02mm and 0.06mm or a range between any two values, such as 0.02mm, 0.03mm, 0.04mm, 0.05mm, 0.06mm, etc.

[0057] Furthermore, if Figure 3 and Figure 4As shown, the height dimension a1 of the first slot 22 along the second direction and the height dimension a2 of the second slot 34 along the second direction satisfy a1=a2. By limiting the relationship between the height dimension a1 of the first slot 22 along the second direction and the height dimension a2 of the second slot 34 along the second direction, the two satisfy a1=a2, thereby ensuring that the annular cavity formed by the docking of the first slot 22 and the second slot 34 is in a closed state on the one hand, preventing external impurities from corroding the elastic snap ring 4, causing the pole 3 and the connector 2 fixed by the elastic snap ring 4 to become loose, thereby destroying the stability of the structure, and on the other hand, by unifying the height dimensions of the first slot 22 and the second slot 34 along the second direction, unified processing is facilitated.

[0058] Alternatively, if Figure 3 and Figure 4 As shown, the diameter dimension of the first slot 22 is k, the diameter dimension of the first plug-in portion 31 along the first direction is f, and they satisfy 0.05mm≤k-2b-f≤0.1mm. By limiting the difference between the diameter dimension k of the first slot 22, the diameter dimension f of the first plug-in portion 31 along the first direction, and the groove depth dimension b of the first slot 22 along the first direction, the three satisfy 0.05mm≤k-2b-f≤0.1mm, thereby ensuring that the first plug-in portion 31 and the second plug-in through hole 21 are clearance-matched, thereby facilitating the plugging of the first plug-in portion 31 and the second plug-in through hole 21.

[0059] Among them, the difference between the diameter dimension k of the first card slot 22, the diameter dimension f of the first plug-in portion 31 along the first direction, and the groove depth dimension b of the first card slot 22 along the first direction can be any value between 0.05mm and 0.1mm or a range between any two values, such as 0.05mm, 0.06mm, 0.07mm, 0.08mm, 0.09mm, 0.1mm, etc.

[0060] Alternatively, if Figure 2As shown, the battery cover also includes a first insulating member 5 and a second insulating member 6. The first insulating member 5 is provided with a first mounting groove and is arranged on the side of the cover body 1 facing the connecting member 2. The connecting member 2 is accommodated in the first mounting groove. The second insulating member 6 is provided with a second mounting groove and is arranged on the side of the cover body 1 away from the first insulating member 5. The limiting portion 33 is accommodated in the second mounting groove. By arranging the first insulating member 5 and the second insulating member 6 on both sides of the cover body 1, respectively, and accommodating the connecting member 2 in the first mounting groove of the first insulating member 5, and accommodating the limiting portion 33 of the pole 3 in the second mounting groove of the second insulating member 6, on the one hand, the first insulating member 5 is used to realize insulation protection of the connecting member 2, and the second insulating member 6 is used to realize insulation protection of the limiting portion 33 of the pole 3. On the other hand, the first insulating member 5 and the connecting member 2 have a spatial overlap in height, and the second insulating member 6 and the limiting portion 33 of the pole 3 have a spatial overlap in height, thereby reducing the structural dimensions of the battery cover in the height direction, making the structure of the battery cover more compact and reducing the occupied space.

[0061] Alternatively, if Figure 2 As shown, the battery cover also includes a sealing member 7, which includes a first sealing portion 71 and a second sealing portion 72. The first sealing portion 71 is sandwiched between the second plug-in portion 32 and the inner wall of the first plug-in through hole, and the second sealing portion 72 is sandwiched between the limiting portion 33 and the bottom surface of the cover body 1 facing the limiting portion 33. By providing the sealing member 7 composed of the first sealing portion 71 and the second sealing portion 72, the sealing member 7 can simultaneously fill and seal the gap between the second plug-in portion 32 and the inner wall of the first plug-in through hole, and the gap between the limiting portion 33 and the bottom surface of the cover body 1 facing the limiting portion 33, and the sealing effect is good, the sealing range is large, the leakage of the electrolyte is avoided to a great extent, and the problem of short circuit caused by the leakage of the electrolyte is reduced, thereby improving the safety performance of the battery cover.

[0062] In this embodiment, a battery cover assembly process is also provided. The battery cover assembly process is used to assemble the above-mentioned battery cover. The battery cover assembly process includes the following steps:

[0063] S1, assembling the first insulating member 5, the second insulating member 6 and the sealing member 7 with the cover plate body 1;

[0064] S2, passing the pole 3 through the sealing member 7, the second insulating member 6, the cover body 1 and the first insulating member 5 in sequence, so that the first plug-in portion 31 passes through the first insulating member 5;

[0065] S3, sleeve the elastic snap ring 4 inside the first plug-in portion 31, and compress the elastic snap ring 4 toward the first plug-in portion 31, so that the elastic snap ring 4 is accommodated in the second clamping groove 34;

[0066] S4, the connector 2 is sleeved on the first plug-in portion 31 through the second plug-in through hole 21, and is moved in the direction close to the cover body 1. When the surface of the first plug-in portion 31 away from the cover body 1 is flush with the surface of the connector 2 away from the cover body 1, the first clamping groove 22 and the second clamping groove 34 together form an annular cavity, and the elastic clamping ring 4 loses its restriction and abuts against the inner wall of the first clamping groove 22;

[0067] S5, welding the connecting piece 2 and the first plug-in portion 31.

[0068] The battery cover assembly method does not require riveting or pressing to assemble the battery cover, thereby simplifying the assembly process, reducing the difficulty of assembly, and improving the efficiency of assembly.

[0069] Among them, for step S5, since there is a clearance fit between the first plug-in portion 31 of the pole 3 and the second plug-in through hole 21 of the connector 2, in order to ensure that the area for subsequent welding with the busbar is large enough, the connector 2 and the first plug-in portion 31 are welded through step S5, so that the gap between the first plug-in portion 31 and the inner wall of the second plug-in through hole 21 is filled with welding material, so that the first plug-in portion 31 of the pole 3 is connected to the connector 2 as a whole, which on the one hand enhances the connection strength between the pole 3 and the connector 2, and on the other hand increases the area for subsequent welding with the busbar.

[0070] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A battery cover, characterized in that: The battery cover comprises: A cover body, wherein a first plug-in through hole is formed on the cover body; A connecting member, the connecting member is arranged at one side of the cover body and is provided with a second plugging through hole connected with the first plugging through hole, and a first card slot is provided on the inner wall of the second plugging through hole; A pole, the pole comprising a first plug-in portion, a second plug-in portion and a limiting portion, the outer wall of the first plug-in portion is provided with a second slot, the first plug-in portion is inserted into the second plug-in through hole, the second slot and the first slot together form a closed annular cavity, the second plug-in portion is inserted into the first plug-in through hole, and the limiting portion is located on a side of the cover body away from the connector; An elastic snap ring, wherein a compression notch is provided on the elastic snap ring, a thickness dimension of the elastic snap ring along a first direction is m, a groove depth dimension of the first groove along the first direction is b, and m>b is satisfied, the elastic snap ring is accommodated in the annular cavity, and has a movement tendency to always press against the inner wall of the first groove.

2. The battery cover according to claim 1, characterized in that: A thickness dimension m of the elastic snap ring along the first direction and a groove depth dimension b of the first snap groove along the first direction satisfy 0.4m≤b≤0.6m.

3. The battery cover according to claim 1, characterized in that: The groove depth dimension of the second groove along the first direction is c, and satisfies m≤c.

4. The battery cover according to claim 1, characterized in that: The height dimension of the first clamping groove along the second direction is a1, the thickness dimension of the elastic clamping ring along the second direction is n, and 0.02mm≤a1-n≤0.06mm is satisfied.

5. The battery cover according to claim 4, characterized in that: The height dimension of the second slot along the second direction is a2, and satisfies 0.02mm≤a2-n≤0.06mm.

6. The battery cover according to claim 5, characterized in that: A height dimension a1 of the first card slot along the second direction and a height dimension a2 of the second card slot along the second direction satisfy a1=a2.

7. The battery cover according to claim 1, characterized in that: The diameter dimension of the first card slot is k, the diameter dimension of the first plug-in portion along the first direction is f, and 0.05mm≤k-2b-f≤0.1mm is satisfied.

8. The battery cover according to claim 1, characterized in that: The battery cover also includes a first insulating member and a second insulating member. The first insulating member is provided with a first mounting groove and is disposed on a side of the cover body facing the connecting member, and the connecting member is accommodated in the first mounting groove. The second insulating member is provided with a second mounting groove and is disposed on a side of the cover body facing away from the first insulating member, and the limiting portion is accommodated in the second mounting groove.

9. The battery cover according to claim 1, characterized in that: The battery cover also includes a seal, which includes a first sealing portion and a second sealing portion, the first sealing portion being clamped between the second plug-in portion and the inner wall of the first plug-in through hole, and the second sealing portion being clamped between the limiting portion and the bottom surface of the cover body facing the limiting portion.

10. The assembly process of the battery cover is characterized in that: The assembly process of the battery cover is used to assemble the battery cover according to any one of claims 1 to 9, and the assembly process of the battery cover comprises the following steps: S1, assembling the first insulating member, the second insulating member and the sealing member with the cover plate body; S2, passing the pole through the sealing member, the second insulating member, the cover body and the first insulating member in sequence, so that the first plug-in portion passes through the first insulating member; S3, sleeve the elastic snap ring inside the first plug-in portion, and compress the elastic snap ring toward the first plug-in portion so that the elastic snap ring is accommodated in the second slot; S4, sleeve the connector onto the first plug-in portion through the second plug-in through hole, and move the connector in a direction close to the cover body, until the surface of the first plug-in portion facing away from the cover body is flush with the surface of the connector facing away from the cover body, the first clamping groove and the second clamping groove together form the annular cavity, and the elastic clamping ring loses its restriction and abuts against the inner wall of the first clamping groove; S5. Welding the connecting piece to the first plug-in portion.

Images