Battery cover plate and battery

Abstract

The utility model belongs to the technical field of batteries, and discloses a battery cover plate and a battery. The battery comprises a battery cover plate, the battery cover plate comprises a cover plate main body and a sealing assembly, a containing hole is formed in the cover plate main body, and a liquid injection hole penetrating through the cover plate main body is formed in the bottom of the containing hole; the sealing assembly comprises a sealing nail and a sealing piece, the sealing nail is embedded in the liquid injection hole, the sealing piece is arranged in the containing hole, the peripheral side wall of the sealing piece and the hole wall of the containing hole are sealed in a welded mode, a first stress release groove is formed in the side, away from the sealing nail, of the sealing piece in a concave mode, and a second stress release groove is formed in the side, close to the sealing nail, of the sealing piece in a concave mode. By arranging the first stress release groove and the second stress release groove, on the premise that the structural strength of the sealing piece is guaranteed, the ductility and deformation capacity of the sealing piece can be improved, the stress release capacity of the sealing piece is improved, cracks are prevented from being generated in welding seams after welding, and the sealing performance of the battery cover plate is improved.

Description

Technical Field

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

[0002] During the production process of a battery, after the battery is filled with liquid, it is necessary to seal the liquid injection channel on the battery cover plate to ensure the safety of the battery cell during use. The sealing process includes using an elastic sealing nail to seal the liquid injection hole to block the channel for the internal electrolyte to leak outwards, then placing a sealing sheet into the receiving hole, and laser welding the edges of the sealing sheet and the receiving hole to complete the sealing.

[0003] After the laser reaches the surface of the welded part, a molten metal liquid is instantly formed in the welding area. During the solidification process of the liquid metal, due to excessive stress caused by the volume change during the cold and heat shrinkage, and excessive external mechanical restraint force after welding, the internal stress release of the sealing sheet fails. When the internal stress reaches a certain level, the weld seam will crack, which is very likely to cause liquid leakage and pose a great potential safety hazard.

[0004] Therefore, there is an urgent need to provide a battery cover plate and a battery to solve the above problems. Summary of the Utility Model

[0005] An object of the utility model is to provide a battery cover plate, which can solve the technical problem of weld seam cracking in the prior art.

[0006] Another object of the utility model is to provide a battery. By providing the above-mentioned battery cover plate, the technical problem of weld seam cracking in the prior art can be solved.

[0007] To achieve the above object, the utility model adopts the following technical solutions:

[0008] The battery cover plate includes:

[0009] A cover plate main body, in which a receiving hole is opened, and a liquid injection hole penetrating through the cover plate main body is opened at the bottom of the receiving hole;

[0010] A sealing assembly, including a sealing nail and a sealing sheet. The sealing nail is embedded in the liquid injection hole, the sealing sheet is arranged in the receiving hole, and the outer peripheral side wall of the sealing sheet is welded and sealed with the hole wall of the receiving hole. A first stress release groove is recessed on the side of the sealing sheet away from the sealing nail, and a second stress release groove is recessed on the side of the sealing sheet close to the sealing nail.

[0011] As an optional solution, the first stress release groove is a central groove arranged at the center of the sealing sheet, and the second stress release groove is an annular groove distributed along the edge of the sealing sheet.

[0012] As an alternative, the shape of the first stress relief groove is one of spherical, cylindrical, frustum-shaped, plum blossom-shaped, and polygonal.

[0013] As an alternative, the bottom edge of the first stress relief groove is a sharp angle or a rounded corner.

[0014] As an alternative, the bottom of the second stress relief groove is an arc surface, and the arc surface is bent towards the direction of the first stress relief groove; or

[0015] The bottom of the second stress relief groove is a plane.

[0016] As an alternative, the accommodating hole and the liquid injection hole are coaxially arranged, and the radial dimension of the accommodating hole is larger than the radial dimension of the liquid injection hole, so as to form a stepped surface at the connection of the accommodating hole and the liquid injection hole, and the bottom end of the sealing sheet can abut against the stepped surface.

[0017] As an alternative, the sealing nail includes a connected sealing part and a first boss, the radial dimension of the first boss is larger than the radial dimension of the sealing part, the sealing part is embedded in the liquid injection hole, and the end face of one end of the first boss close to the sealing part abuts against the stepped surface.

[0018] As an alternative, a relief groove for avoiding the first boss is recessed on one side of the sealing sheet close to the sealing nail.

[0019] As an alternative, the bottom of the relief groove is an arc surface, and the arc surface is bent towards the direction of the first stress relief groove; or

[0020] The bottom of the relief groove is a plane, and the plane is parallel to the end face of the first boss close to the relief groove.

[0021] As an alternative, the sealing nail further includes a second boss, the second boss is connected to one end of the sealing part away from the first boss, the radial dimension of the second boss is larger than the radial dimension of the sealing part, and the end face of one end of the second boss close to the sealing nail abuts against the bottom surface of the cover plate body.

[0022] As an alternative, a deformation groove is provided at one end of the sealing nail away from the sealing sheet.

[0023] As an alternative, the deformation groove is a wedge-shaped groove penetrating the sealing nail in the radial direction, or the deformation groove is a conical groove provided at the center of one end of the sealing nail away from the sealing sheet.

[0024] As an alternative solution, a welding portion for welding is formed between the upper edge of the sealing piece and the edge of the first stress relief groove.

[0025] As an alternative solution, the sealing piece includes a main body and a welding portion protruding from the upper edge of the main body. The accommodating hole includes a first hole and a second hole formed in the upper edge of the first hole. The liquid injection hole penetrates the bottom of the first hole. The main body is accommodated in the first hole, the welding portion is accommodated in the second hole, and the outer peripheral side wall of the welding portion is welded and sealed with the hole wall of the second hole.

[0026] A battery includes a housing, an electric core, and the above-mentioned battery cover plate. The electric core is accommodated in the housing, and the battery cover plate is covered on the housing.

[0027] Advantages of the present utility model:

[0028] The present utility model provides a battery cover plate. By recessing a first stress relief groove on the side of the sealing piece away from the sealing nail and recessing a second stress relief groove on the side of the sealing piece close to the sealing nail, the ductility and deformation ability of the sealing piece can be increased while ensuring the structural strength of the sealing piece, the stress release ability of the sealing piece can be improved, cracks in the weld seam after welding can be prevented, and the sealing performance of the battery cover plate can be improved.

[0029] The present utility model also provides a battery. By providing the above-mentioned battery cover plate, the ductility of the sealing piece can be increased while ensuring the structural strength of the sealing piece, the stress release ability of the sealing piece can be improved, cracks in the weld seam after welding can be prevented, the sealing performance of the battery cover plate can be improved, and thus the safety performance of the battery can be improved. Description of the Drawings

[0030] Figure 1 is a schematic structural diagram of the battery cover plate provided by the present utility model;

[0031] Figure 2 is an exploded view of the battery cover plate provided by the present utility model;

[0032] Figure 3 is a top view of the sealing piece provided by the present utility model Figure 1 ;

[0033] Figure 4 is a top view of the sealing piece provided by the present utility model Figure 2 ;

[0034] Figure 5 is a cross-sectional view of the sealing piece provided by the present utility model Figure 1 ;

[0035] Figure 6 is a cross-sectional view of the sealing piece provided by the present utility model Figure 2 ;

[0036] Figure 7 is the cross-section of the sealing sheet provided by the present utility model Figure 3 ;

[0037] Figure 8 is the cross-section of the sealing sheet provided by the present utility model Figure 4 ;

[0038] Figure 9 is the cross-section of the sealing sheet provided by the present utility model Figure 5 ;

[0039] Figure 10 is the cross-section of the sealing sheet provided by the present utility model Figure 6 ;

[0040] Figure 11 is the cross-section of the sealing sheet and the cover plate body provided by the present utility model Figure 1 ;

[0041] Figure 12 is the cross-section of the sealing sheet and the cover plate body provided by the present utility model Figure 2 ;

[0042] Figure 13 is the cross-section of the sealing nail provided by the present utility model Figure 1 ;

[0043] Figure 14 is the cross-section of the sealing nail provided by the present utility model Figure 2 ;

[0044] Figure 15 is the structural schematic diagram of the battery provided by the present utility model.

[0045] In the figure:

[0046] 100, battery cover plate; 200, housing;

[0047] 10, cover plate body; 11, accommodation hole; 111, second hole; 112, first hole; 12, liquid injection hole; 13, step surface;

[0048] 20, sealing sheet; 21, first stress relief groove; 211, first fillet; 22, second stress relief groove; 23, positioning hole; 24, avoidance groove; 25, welding part; 26, body; 27, second fillet;

[0049] 30, sealing nail; 31, first boss; 32, sealing part; 33, second boss; 34, deformation groove. Specific embodiments

[0050] The present utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present utility model, rather than limiting the present utility model. In addition, it should be noted that for the sake of description, only the parts related to the present utility model rather than all the structures are shown in the drawings.

[0051] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0052] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features between them. Moreover, the first feature being "above", "over", and "on top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "beneath", and "under" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0053] In the description of this embodiment, the orientation or positional relationships such as "above", "below", "right", etc. are based on the orientation or positional relationships shown in the drawings. It is only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be understood as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0054] Such as Figure 1 and Figure 2As shown in the figure, this embodiment provides a battery cover plate 100, which includes a cover plate main body 10 and a sealing assembly. A receiving hole 11 is formed in the cover plate main body 10, and a liquid injection hole 12 penetrating through the cover plate main body 10 is formed at the bottom of the receiving hole 11. The receiving hole 11 is arranged around the circumference of the liquid injection hole 12, and electrolyte can be injected into the battery through the liquid injection hole 12. The sealing assembly includes a sealing nail 30 and a sealing sheet 20. The sealing nail 30 is embedded in the liquid injection hole 12, and the circumferential surface of the sealing nail 30 is in close fit with the hole wall of the liquid injection hole 12 to form a first-stage seal; the sealing sheet 20 is arranged in the receiving hole 11, and a ring gap for welding is formed between the upper edge of the sealing sheet 20 and the upper edge of the receiving hole 11. The outer circumferential side wall of the sealing sheet 20 and the hole wall of the receiving hole 11 are welded and sealed along the ring gap, thereby forming a second-stage seal, improving the sealing performance of the battery cover plate 100.

[0055] As Figure 1 and Figure 2 shown in the figure, a first stress relief groove 21 is recessed on the side of the sealing sheet 20 away from the sealing nail 30, and a second stress relief groove 22 is recessed on the side of the sealing sheet 20 close to the sealing nail 30. By recessing the first stress relief groove 21 on the side of the sealing sheet 20 away from the sealing nail 30 and the second stress relief groove 22 on the side of the sealing sheet 20 close to the sealing nail 30, the ductility and deformation ability of the sealing sheet 20 can be increased while ensuring the structural strength of the sealing sheet 20, improving the stress relief ability of the sealing sheet 20, preventing cracks from occurring in the weld after welding, and improving the sealing performance of the battery cover plate 100.

[0056] In an alternative embodiment, as Figure 2 shown in the figure, the first stress relief groove 21 is a central groove provided at the center of the sealing sheet 20. The central groove is concentric with the sealing sheet 20, and the central groove is set to be relatively large, almost covering the entire surface of the sealing sheet 20. This form of the first stress relief groove 21 can effectively increase the extensibility of the sealing sheet 20, thereby effectively releasing the stress of the sealing sheet 20.

[0057] In an alternative embodiment, as Figure 2 shown in the figure, the second stress relief groove 22 is an annular groove distributed along the edge of the sealing sheet 20. The annular groove is concentric with the sealing sheet 20. This form of the second stress relief groove 22 can further increase the extensibility of the sealing sheet 20 while ensuring the structural strength of the sealing sheet 20, thereby further releasing the stress of the sealing sheet 20.

[0058] Exemplarily, in an alternative embodiment, as Figure 2 shown in the figure, the shape of the first stress relief groove 21 can be spherical, specifically in the shape of a Figure 2 less hemispherical shape shown in the figure, and the bottom of the first stress relief groove 21 is spherical. In another alternative embodiment, as Figure 3As shown, the top view shape of the first stress relief groove 21 can also be plum blossom-shaped, where the plum blossom shape can be formed by connecting three or more arc segments end to end in sequence. In another alternative embodiment, as Figure 4 shown, the top view shape of the first stress relief groove 21 can also be polygonal, such as a polygonal prism, pyramid or frustum. Among them, the polygonal shape can be a triangle, quadrilateral, pentagon or other polygons, and no specific limitation is made here. In another alternative embodiment, as Figure 5 shown, the first stress relief groove 21 can also be frustum-shaped. In another alternative embodiment, as Figure 6 shown, the first stress relief groove 21 can also be cylindrical. In other embodiments, the first stress relief groove 21 can also be of other shapes, and no specific limitation is made here.

[0059] Exemplarily, in an alternative embodiment, the cross-sectional shape of the second stress relief groove 22 can be rectangular, trapezoidal, arc-shaped, triangular or other shapes, and no specific limitation is made here.

[0060] In an alternative embodiment, as Figures 3 to 6 shown, a positioning hole 23 is recessed at the center of the bottom of the first stress relief groove 21. The positioning hole 23 is coaxially arranged with the first stress relief groove 21 to facilitate subsequent visual recognition by welding equipment.

[0061] In an alternative embodiment, referring to Figure 5 and Figure 6 , except for the spherical first stress relief groove 21, the bottom edge of the first stress relief groove 21 in other forms adopts a rounded corner transition, that is, a first rounded corner 211 is provided at the bottom edge of the first stress relief groove 21. The setting of the first rounded corner 211 can avoid the risk of cracking at the bottom edge caused by sharp corner transition.

[0062] In another alternative embodiment, referring to Figure 7 and Figure 8 , considering the actual processing problem, except for the spherical first stress relief groove 21, the bottom edge of the first stress relief groove 21 in other forms can also be a sharp corner. Compared with the rounded corner transition, the first stress relief groove 21 with a sharp corner transition is easier to process and saves processing costs.

[0063] In an alternative embodiment, as Figure 2 , Figure 5 and Figure 6 shown, the bottom of the second stress relief groove 22 is an arc surface, and the arc surface bends towards the direction of the first stress relief groove 21. When the first stress relief groove 21 is Figure 2When in the spherical shape as shown, the arc-shaped bottom of the second stress relief groove 22 can be parallel to the bottom of the first stress relief groove 21. By setting the bottom of the second stress relief groove 22 as an arc surface, while improving the stress relief effect of the sealing piece 20, it can ensure that it will not undergo large deformation.

[0064] In another alternative embodiment, as Figure 9 shown, considering the actual processing problem, the bottom of the second stress relief groove 22 can also be a plane, preferably a horizontal plane as Figure 9 shown. Compared with the arc-shaped bottom, the second stress relief groove 22 with a horizontal bottom is easier to process and saves processing costs.

[0065] In an alternative embodiment, as Figure 10 shown, taking the spherical first stress relief groove 21 as an example, a welding portion 25 for welding is formed between the upper edge of the sealing piece 20 and the edge of the first stress relief groove 21. That is to say, when processing the first stress relief groove 21, instead of directly grooving from the edge of the sealing piece 20, a small distance is moved inward from the edge of the sealing piece 20 and then grooved to reserve the welding portion 25. The sealing piece 20 and the cover plate body 10 can be sealed by welding along the welding portion 25 to ensure the welding quality. It should be noted that when the first stress relief groove 21 is in other forms, a welding portion 25 is reserved at the edge of the sealing piece 20, which will not be elaborated here.

[0066] In another alternative embodiment, as Figure 11 shown, the sealing piece 20 may include a body 26 and a welding portion 25 protruding from the upper edge of the body 26. The radial dimension of the welding portion 25 is greater than that of the body 26; correspondingly, the receiving hole 11 includes a first hole 112 and a second hole 111 opened on the upper edge of the first hole 112. The aperture of the second hole 111 is greater than that of the first hole 112. The liquid injection hole 12 penetrates the bottom of the first hole 112. The body 26 is accommodated in the first hole 112, and the welding portion 25 is accommodated in the second hole 111, and the outer peripheral side wall of the welding portion 25 is welded and sealed with the hole wall of the second hole 111. Among them, the welding portion 25 is mainly used to cooperate with the second hole 111 for welding to achieve sealing, improving the sealing effect, and the welding portion 25 is relatively thin and easy to deform, making the stress relief effect of the sealing piece 20 better.

[0067] In an alternative embodiment, as Figure 12 shown, the outer side of the connection between the welding portion 25 and the body 26 is provided with a rounded corner to form a second rounded corner 27. By setting the second rounded corner 27, the risk of tearing due to stress concentration on the outer side of the connection between the welding portion 25 and the body 26 can be avoided.

[0068] In another alternative embodiment, as Figure 11As shown, considering the actual processing problems, the outer side of the connection between the welding part 25 and the main body 26 can also adopt a sharp corner transition. Compared with the rounded corner transition, the sealing piece 20 with a sharp corner transition is easier to process and saves processing costs.

[0069] In an alternative embodiment, as Figure 1 and Figure 2 shown, the accommodating hole 11 and the liquid injection hole 12 are coaxially arranged, and the radial dimension of the accommodating hole 11 is larger than the radial dimension of the liquid injection hole 12. Therefore, the accommodating hole 11 and the liquid injection hole 12 together form a stepped hole, and a step surface 13 is formed at the connection of the accommodating hole 11 and the liquid injection hole 12. The bottom end of the sealing piece 20 can abut against the step surface 13. The above setting can limit the installation of the sealing piece 20, so that the top surface of the sealing piece 20 can be as flush as possible with the top surface of the cover plate main body 10, ensuring aesthetics, and at the same time preventing the sealing piece 20 from squeezing the sealing nail 30, ensuring the sealing performance. Secondly, the step surface 13 can also support the sealing piece 20 during welding, making the sealing piece 20 placed stably and ensuring the welding quality.

[0070] In an alternative embodiment, as Figure 2 shown, the sealing nail 30 includes a connected sealing part 32 and a first boss 31. The radial dimension of the first boss 31 is slightly larger than the radial dimension of the sealing part 32. The sealing part 32 is embedded in the liquid injection hole 12, and the end surface of the first boss 31 close to the sealing part 32 abuts against the step surface 13. The first boss 31 plays a positioning role when installing the sealing nail 30, avoiding inserting the sealing nail 30 into the liquid injection hole 12 and affecting the sealing performance. The sealing nail 30 is a glue nail, and the dimension of the sealing part 32 is slightly larger than the dimension of the liquid injection hole 12. The sealing part 32 forms an interference fit relationship with the liquid injection hole 12 through its own elastic deformation to seal the liquid injection hole 12.

[0071] As Figure 1 and Figure 2 shown, a relief groove 24 for avoiding the first boss 31 is recessed on the side of the sealing piece 20 close to the sealing nail 30. The radial dimension of the relief groove 24 is larger than the radial dimension of the first boss 31, and the depth of the relief groove 24 is greater than the thickness of the first boss 31. The relief groove 24 can accommodate the first boss 31, thereby avoiding the first boss 31, preventing interference between the sealing piece 20 and the sealing nail 30, not only ensuring the normal installation of the sealing nail 30, but also ensuring the normal installation of the sealing piece 20, making the sealing piece 20 abut against the step surface 13, ensuring the welding yield and the sealing effect. In addition, the relief groove 24 can further increase the deformation ability of the sealing piece 20 on the premise of ensuring the structural strength of the sealing piece 20, thereby further improving the stress release effect of the sealing piece 20.

[0072] In an alternative embodiment, as Figure 2As shown, the bottom of the avoidance groove 24 is an arc surface, and this arc surface bends towards the direction of the first stress relief groove 21. When the first stress relief groove 21 is Figure 2 in the spherical shape as shown, the arc bottom of the avoidance groove 24 can be parallel to the bottom of the first stress relief groove 21. By setting the bottom of the avoidance groove 24 as an arc, while improving the stress relief effect of the sealing piece 20, it can ensure that it will not undergo large deformation.

[0073] In another alternative embodiment, as Figure 9 shown, the bottom of the avoidance groove 24 can also be a plane, and this plane is parallel to the end face of the first boss 31 close to the avoidance groove 24, that is, preferably a horizontal plane as Figure 9 shown. Compared with the arc bottom, the avoidance groove 24 with a horizontal bottom is easier to machine and saves machining costs.

[0074] In an alternative embodiment, as Figure 1 and Figure 2 shown, the sealing nail 30 further includes a second boss 33. The second boss 33 is a hemispherical structure. The second boss 33 is connected to one end of the sealing part 32 away from the first boss 31. The radial dimension of the second boss 33 is greater than the radial dimension of the sealing part 32. The end face of the second boss 33 close to the sealing nail 30 abuts against the bottom surface of the cover plate main body 10. The above setting enables the sealing nail 30 to form an interference fit with the liquid injection hole 12 through the elastic deformation of itself when sealing the liquid injection hole 12, as Figure 1 shown. The lower surface of the first boss 31 abuts tightly against the step surface 13, and the upper surface of the second boss 33 abuts tightly against the lower surface of the cover plate main body 10, thereby improving the sealing performance and reducing the risk of liquid leakage.

[0075] In an alternative embodiment, as Figure 1 and Figure 2 shown, a deformation groove 34 is provided at one end of the sealing nail 30 away from the sealing piece 20. The deformation groove 34 can cause the bottom of the sealing nail 30 to deform, thereby facilitating the installation of the sealing nail 30. When installing the sealing nail 30, it is necessary to pass the sealing nail 30 through the liquid injection hole 12 from top to bottom. Due to the interference fit, it will cause the bottom of the sealing nail 30 to deform towards the inside of the deformation groove 34 after being squeezed. After installation, the bottom of the sealing nail 30 rebounds, and after the rebound, the sealing part 32 and the inner wall of the liquid injection hole 12 form extrusion, ensuring good sealing performance and convenient and fast installation.

[0076] Exemplarily, in an alternative embodiment, as Figure 13 shown, the deformation groove 34 can be a wedge-shaped groove penetrating the sealing nail 30 along the radial direction. In another alternative embodiment, as Figure 14As shown, the deformation groove 34 can also be a conical groove opened at the center of the end of the sealing nail 30 away from the sealing piece 20, and can be selected as a conical groove. For the above two forms of the deformation groove 34, the installation of the sealing nail 30 can be facilitated.

[0077] It should be noted that the cover plate main body 10 is a light aluminum plate, and the sealing piece 20 is made of a metal material, preferably an aluminum material, which has high structural strength, is wear-resistant, and is convenient for welding. It should be noted that in addition to the above-mentioned cover plate main body 10, sealing nail 30 and sealing piece 20, the battery cover plate 100 also includes structures such as pole posts, explosion-proof valves, and lower plastic plates. The other structures of the battery cover plate 100 belong to the prior art and will not be elaborated here.

[0078] As Figure 15 shown, this embodiment also provides a battery, including a housing 200, an electric core, and the above-mentioned battery cover plate 100. The electric core is accommodated in the housing 200, and the battery cover plate 100 is covered on the housing 200. The liquid injection hole 12 on the cover plate main body 10 is used to inject electrolyte into the battery so that the electric core can be infiltrated by the electrolyte.

[0079] For the battery in this embodiment, by adopting the above-mentioned battery cover plate 100, the ductility of the sealing piece 20 can be increased on the premise of ensuring the structural strength of the sealing piece 20, the stress release ability of the sealing piece 20 can be improved, cracks in the weld seam after welding can be prevented, the sealing performance of the battery cover plate 100 can be improved, and thus the safety performance of the battery can be improved.

[0080] Obviously, the above embodiments of the present invention are only examples for clearly explaining the present invention, and are not intended to limit the implementation manners of the present invention. For those of ordinary skill in the art, various obvious changes, re-adjustments, and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A battery cover, characterized in that: include: A cover plate body (10), wherein a receiving hole (11) is provided on the cover plate body (10), and a liquid injection hole (12) penetrating the cover plate body (10) is provided at the bottom of the receiving hole (11); A sealing assembly comprises a sealing pin (30) and a sealing sheet (20), wherein the sealing pin (30) is embedded in the injection hole (12), the sealing sheet (20) is arranged in the receiving hole (11), and the outer peripheral side wall of the sealing sheet (20) is welded and sealed with the hole wall of the receiving hole (11), a first stress release groove (21) is recessed on the side of the sealing sheet (20) away from the sealing pin (30), and a second stress release groove (22) is recessed on the side of the sealing sheet (20) close to the sealing pin (30).

2. The battery cover according to claim 1, characterized in that: The first stress release groove (21) is a central groove arranged at the center of the sealing sheet (20), and the second stress release groove (22) is an annular groove distributed along the edge of the sealing sheet (20).

3. The battery cover according to claim 2, characterized in that: The shape of the first stress release groove (21) is one of spherical, cylindrical, truncated cone, plum blossom, and polygonal.

4. The battery cover according to claim 2, characterized in that: The bottom edge of the first stress release groove (21) is a sharp corner or a first rounded corner (211).

5. The battery cover according to claim 2, characterized in that: The bottom of the second stress release groove (22) is an arc-shaped surface, and the arc-shaped surface is bent in the direction of the first stress release groove (21); or The bottom of the second stress release groove (22) is a plane.

6. The battery cover according to any one of claims 1 to 5, characterized in that: The receiving hole (11) is coaxially arranged with the injection hole (12); the radial dimension of the receiving hole (11) is larger than the radial dimension of the injection hole (12), so as to form a step surface (13) at the connection between the receiving hole (11) and the injection hole (12); and the bottom end of the sealing sheet (20) can abut against the step surface (13).

7. The battery cover according to claim 6, characterized in that: The sealing pin (30) comprises a sealing portion (32) and a first boss (31) connected to each other, the radial dimension of the first boss (31) is larger than the radial dimension of the sealing portion (32), the sealing portion (32) is embedded in the injection hole (12), and an end surface of the first boss (31) close to the sealing portion (32) abuts against the step surface (13).

8. The battery cover according to claim 7, characterized in that: A side of the sealing sheet (20) close to the sealing pin (30) is provided with an avoidance groove (24) for avoiding the first boss (31).

9. The battery cover according to claim 8, characterized in that: The groove bottom of the avoidance groove (24) is an arc-shaped surface, and the arc-shaped surface is bent in the direction of the first stress release groove (21); or The groove bottom of the avoidance groove (24) is a plane, and the plane is parallel to the end surface of the first boss (31) close to the avoidance groove (24).

10. The battery cover according to claim 7, characterized in that: The sealing pin (30) further comprises a second boss (33), the second boss (33) being connected to an end of the sealing portion (32) away from the first boss (31), the radial dimension of the second boss (33) being greater than the radial dimension of the sealing portion (32), and an end surface of the second boss (33) close to the sealing pin (30) abutting against the bottom surface of the cover plate body (10).

11. The battery cover according to any one of claims 1 to 5, characterized in that: A deformation groove (34) is provided at one end of the sealing pin (30) away from the sealing sheet (20).

12. The battery cover according to claim 11, characterized in that: The deformation groove (34) is a wedge-shaped groove that penetrates the sealing pin (30) in the radial direction, or the deformation groove (34) is a conical groove opened at the center of one end of the sealing pin (30) away from the sealing sheet (20).

13. The battery cover according to any one of claims 1 to 5, characterized in that: A welding portion (25) for welding is formed between the upper edge of the sealing sheet (20) and the edge of the first stress release groove (21).

14. The battery cover according to any one of claims 1 to 5, characterized in that: The sealing sheet (20) comprises a main body (26) and a welding portion (25) protruding from the upper edge of the main body (26); the accommodating hole (11) comprises a first hole (112) and a second hole (111) opened at the upper edge of the first hole (112); the injection hole (12) passes through the bottom of the first hole (112); the main body (26) is accommodated in the first hole (112); the welding portion (25) is accommodated in the second hole (111); and the outer peripheral side wall of the welding portion (25) is welded and sealed to the hole wall of the second hole (111).

15. A battery, characterized in that It comprises a shell (200), a battery cell and a battery cover plate as claimed in any one of claims 1 to 14, wherein the battery cell is accommodated in the shell (200) and the battery cover plate is covered on the shell (200).

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