Battery cover, anti-overflow gasket and battery

Abstract

The utility model relates to the technical field of batteries, and provides a battery cover, an anti-overflow gasket and a battery. The battery cover comprises a cover body, the cover body comprises a first surface and a second surface which are opposite to each other, the cover body is provided with a liquid injection hole, and the liquid injection hole penetrates through the first surface and the second surface; the sealing nail comprises a limiting column and a clamping column which are connected, the clamping column extends into the liquid injection hole, the limiting column is located on the side, where the first surface is located, of the cover body, the orthographic projection of the liquid injection hole on the limiting column is located in the limiting column, the limiting column comprises a limiting face opposite to the first surface, and the limiting face is located on the side, where the first surface is located, of the liquid injection hole. The limiting face is attached to the cover body, and the circumferential edge of the limiting face is welded to the cover body. According to the battery cover provided by the embodiment of the invention, the welding stability between the sealing needle and the cover body can be improved.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a battery cover, an anti-overflow gasket, and a battery. Background Technology

[0002] In the prior art, the liquid injection hole of the square battery cell adopts a recessed design, and the sealing pin is set in the groove structure. The outer peripheral surface of the sealing pin is connected to the inner peripheral surface of the recessed structure by welding. However, this requires high positioning of the sealing pin design. If the gap is not properly matched, defects such as cracks are prone to occur during welding. Utility Model Content

[0003] In order to solve the above-mentioned technical problems, or at least partially solve the above-mentioned technical problems, the present invention provides a battery cover, an anti-overflow gasket, and a battery.

[0004] In a first aspect, this application provides a battery cover, which may include: a cover body, the cover body including a first surface and a second surface opposite to each other, the cover body having an injection hole that penetrates the first surface and the second surface; a sealing pin, the sealing pin including a limiting post and a locking post connected together, the locking post extending into the injection hole, the limiting post being located on the side of the first surface of the cover body, the orthographic projection of the injection hole on the limiting post being located within the limiting post, the limiting post including a limiting surface opposite to the first surface, the limiting surface being fitted to the cover body, and the circumferential edge of the limiting surface being welded to the cover body.

[0005] In this way, the sealing pin and injection hole provided in this application make the welding position between the sealing pin and the cover body the outer peripheral surface of the first surface of the cover body and the limiting surface. Compared with the gap between the outer peripheral surface of the sealing pin and the inner peripheral surface of the recessed structure in the prior art, the situation of improper gap matching is completely avoided, making the welding more stable.

[0006] In some embodiments of this application, the limiting surface includes a central region and a side region, the side region surrounds the circumferential outer side of the central region, the central region is connected to the positioning post, the orthogonal projection of the injection hole on the limiting post is located within the central region, and the side region is in contact with the cover.

[0007] In some embodiments of this application, the locking post includes a guide section and a main body section. One end of the main body section is connected to the limiting post, and the other end is connected to the guide section. In the direction from the limiting post to the locking post, the cross-sectional area of ​​the guide section gradually decreases.

[0008] In some embodiments of this application, the guide segment is formed as an inverted frustum-shaped structure.

[0009] Secondly, this application provides an anti-overflow pad, the anti-overflow pad including a third surface and a fourth surface opposite to each other, the third surface being in contact with the first surface, the anti-overflow pad having a positioning hole that penetrates the third surface and the fourth surface, and the orthographic projection of the injection hole on the positioning hole being located inside the positioning hole.

[0010] In this way, by setting an anti-overflow gasket, while ensuring that the liquid injection process in the injection hole proceeds normally, the anti-overflow gasket can be removed after the liquid injection is completed, and the sealing needle can be welded to the preset position, which can improve the situation where the first surface is sputtered with electrolyte.

[0011] In some embodiments of this application, the third surface is bonded to the first surface.

[0012] In some embodiments of this application, the anti-overflow gasket includes a main body layer and an adhesive layer stacked together, the adhesive layer having a third surface on the side facing away from the main body layer, the main body having a fourth surface on the side facing away from the adhesive layer, and the adhesive layer being bonded to the first surface.

[0013] In some embodiments of this application, the main body layer is a porous material layer that can absorb electrolyte overflowing from the injection hole.

[0014] In some embodiments of this application, the spill-proof gasket further includes an easy-tear portion located on the circumferential outer side of the adhesive layer and connected to the adhesive layer.

[0015] Thirdly, this application provides a battery comprising: a battery casing, the battery casing comprising: a casing body and a battery cover as described in any of the above embodiments, the casing body and the battery cover jointly defining a mounting cavity; and a battery cell, the battery cell being mounted within the mounting cavity.

[0016] The technical effects of any design scheme in the third aspect can be found in the technical effects of different design methods in the first aspect, and will not be repeated here. Attached Figure Description

[0017] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the present invention and, together with the description, serve to explain the principles of the present invention.

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 A schematic diagram of a battery cover provided for some embodiments of this application;

[0020] Figure 2 for Figure 1 A cross-sectional view of the battery cover shown;

[0021] Figure 3 for Figure 2 A schematic diagram of the sealing pin shown;

[0022] Figure 4 A schematic diagram of a battery cover provided for other embodiments of this application;

[0023] Figure 5 for Figure 4 A schematic diagram of the adhesive overflow pad shown;

[0024] Figure 6 for Figure 5 The cross-sectional view of the overflow gasket shown.

[0025] Figure label:

[0026] 100. Battery cover;

[0027] 110. Cap; 111. Injection hole;

[0028] 120. Sealing pin; 121. Limiting post; 1211. Limiting surface; 122. Locking post;

[0029] 200. Anti-overflow gasket; 201. Positioning hole;

[0030] 210. Main body layer;

[0031] 220. Adhesive layer;

[0032] 230. Tear-resistant section. Detailed Implementation

[0033] To better understand the above-mentioned objectives, features, and advantages of this utility model, the solution of this utility model will be further described below. It should be noted that, unless otherwise specified, the embodiments and features of this utility model can be combined with each other.

[0034] Many specific details are set forth in the following description in order to provide a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only some embodiments of the present invention, and not all embodiments.

[0035] Currently, the liquid injection hole of square battery cells adopts a recessed design, with the sealing pin located in the groove structure. The outer circumferential surface of the sealing pin is connected to the inner circumferential surface of the recessed structure by welding. However, this requires high precision in the design and positioning of the sealing pin. If the gap is not properly matched, defects such as cracks may easily occur during welding.

[0036] To solve the above-mentioned technical problems, this application provides a battery that may include a battery casing and a battery cell. The battery casing may include a casing body and a battery cover 100. The casing body is formed as a casing structure with an open opening on one side. The battery cover 100 covers the open opening of the casing body. The battery cover 100 and the casing body together define an installation cavity, and the battery cell is installed in the installation cavity.

[0037] Specifically, the battery is a square battery, the casing body is formed into a square structure, one side surface of the square casing body is formed into an open opening, the battery cover 100 is formed into a plate shape, and the plate-shaped battery cover 100 covers the open opening.

[0038] Please refer to Figures 1 to 3 The battery cover 100 may include a cover body 110 and a sealing pin 120. The cover body 110 includes a first surface and a second surface facing each other. The first surface faces away from the casing body, and the second surface faces the casing body. The cover body 110 is provided with an injection hole 111, which penetrates the first surface and the second surface. Electrolyte is injected into the battery casing through the injection hole 111. In specific implementations, the injection hole 111 may be formed as a cylindrical through hole.

[0039] The sealing pin 120 includes a connected limiting post 121 and a locking post 122. The locking post 122 extends into the injection hole 111. The limiting post 121 is located on the side where the first surface of the cover 110 is located. The orthographic projection of the injection hole 111 on the limiting post 121 is located inside the limiting post 121, that is, the limiting post 121 covers the injection hole 111. The limiting post 121 includes a limiting surface 1211 opposite to the first surface. The limiting surface 1211 is in contact with the cover 110, and the circumferential edge of the limiting surface 1211 is welded to the cover 110.

[0040] The limiting post 121 and the locking post 122 are both formed into cylindrical structures. The radial dimension of the limiting post 121 is larger than that of the locking post 122. The locking post 122 matches the size of the injection hole 111. Specifically, the gap between the locking post 122 and the injection hole 111 is greater than or equal to 0, so that the locking post 122 can be locked into the injection hole 111.

[0041] In this way, through the sealing pin 120 and the injection hole 111 provided in this application, the welding position between the sealing pin 120 and the cover 110 is the first surface of the cover 110 and the outer peripheral surface of the limiting surface 1211. Compared with the prior art where the gap between the outer peripheral surface of the sealing pin 120 and the inner peripheral surface of the recessed structure is the welding position, the situation of improper gap matching is completely avoided, making the welding more stable.

[0042] In some embodiments of this application, the limiting surface 1211 includes a central region and a side region. The side region surrounds the circumferential outer side of the central region. The central region is connected to the locking post 122. The orthographic projection of the injection hole 111 on the limiting post 121 is located within the central region, that is, the central region completely covers the injection hole 111. The side region is in contact with the cover 110.

[0043] Therefore, by completely covering the injection hole 111 with the central area of ​​the limiting surface 1211, it can be ensured that the surrounding area of ​​the injection hole 111 is in contact with the side area, thus ensuring the stability of the contact between the limiting post 121 and the first surface, and further ensuring the stability of the welding between the sealing nail 120 and the cover 110.

[0044] In some embodiments of this application, the locking post 122 includes a guide section and a main body section. One end of the main body section is connected to the limiting post, and the other end is connected to the guide section. In the direction from the limiting post to the locking post 122, the cross-sectional area of ​​the guide section gradually decreases.

[0045] It can be understood that by setting a guide section, the locking post 122 can be more easily inserted into the injection hole 111, reducing the workload of operators and improving assembly efficiency.

[0046] Furthermore, the guide segment can be formed into an inverted frustum-shaped structure.

[0047] During the process of injecting electrolyte into the battery, there is a possibility that the electrolyte may overflow or splash onto the first surface. In the existing technology, cleaning is generally carried out by laser cleaning equipment or non-woven cloth wiping mechanism to ensure the cleanliness of the first surface, which is costly and complicated to operate.

[0048] To address the issue of electrolyte being sputtered onto the first surface, please refer to [link / reference]. Figures 4 to 6 This application also provides an anti-overflow pad 200, which is applied to the battery cover 100 in any of the above-mentioned solutions. The anti-overflow pad 200 includes a third surface and a fourth surface opposite to each other. The third surface is attached to the first surface. The anti-overflow pad 200 is provided with a positioning hole 201, which penetrates the third surface and the fourth surface. The orthographic projection of the injection hole 111 on the positioning hole 201 is located inside the positioning hole 201, that is, the edge of the positioning hole 201 is located circumferentially outside the edge of the injection hole 111.

[0049] In this way, by setting the anti-overflow gasket 200, while ensuring that the liquid injection process of the injection hole 111 proceeds normally, the anti-overflow gasket 200 can be removed after the liquid injection is completed, and the sealing needle can be welded to the preset position, which can improve the situation of the first surface being splashed with electrolyte.

[0050] In some embodiments of this application, the third surface is bonded to the first surface. This facilitates the removal of the anti-overflow gasket 200 after the injection is completed.

[0051] Specifically, the anti-overflow gasket 200 includes a main body layer 210 and an adhesive layer 220 stacked together. The surface of the adhesive layer 220 facing away from the main body layer 210 is the third surface, and the surface of the main body layer 210 facing away from the adhesive layer 220 is the fourth surface. The adhesive layer 220 is bonded to the first surface.

[0052] In some embodiments of this application, the main body layer 210 is a porous material layer that can absorb electrolyte overflowing from the injection hole 111. Therefore, by setting the main body layer 210 as a porous material layer capable of absorbing electrode liquid, the occurrence of flowing electrolyte on the anti-overflow gasket 200 can be avoided, and secondary contamination of the first surface by the electrolyte after removing the anti-overflow gasket 200 can be prevented.

[0053] The main layer 210 can be made of non-woven fabric.

[0054] In some embodiments of this application, the spill gasket 200 further includes an easy-tear portion 230, which is located on the circumferential outer side of the adhesive layer 220 and connected to the adhesive layer 220. Thus, by providing the easy-tear portion 230, a handhold is provided for the operator to remove the spill gasket 200.

[0055] In the description of this utility model, it should be understood that the terms "center", "upper", "lower", "front", "rear", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0056] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0057] In the description of the embodiments of this utility model, the term "and / or" refers to and covers any and all possible combinations of one or more of the associated listed items. The term "and / or" describes an association relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. Additionally, the character " / " in this utility model generally indicates that the preceding and following related objects have an "or" relationship.

[0058] In the description of the embodiments of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, "linking" can be a detachable connection or a non-detachable connection; it can be a direct connection or an indirect connection through an intermediate medium. "Fixed connection" refers to a connection where the relative positional relationship remains unchanged after the connection. Furthermore, the directional terms mentioned in the embodiments of this utility model, such as "inner" and "outer," are only for reference to the directions in the accompanying drawings. Therefore, the directional terms used are for better and clearer explanation and understanding of the embodiments of this utility model, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this utility model.

[0059] In the description of embodiments of this utility model, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0060] The above description is merely a specific embodiment of the present invention, enabling those skilled in the art to understand or implement the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments described herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A battery cover, characterized in that, include: A cover body, the cover body including a first surface and a second surface opposite to each other, the cover body having an injection hole that penetrates the first surface and the second surface; The sealing pin includes a connected limiting post and a locking post. The locking post extends into the injection hole. The limiting post is located on the side of the first surface of the cover. The orthographic projection of the injection hole on the limiting post is located inside the limiting post. The limiting post includes a limiting surface opposite to the first surface. The limiting surface is fitted to the cover. The circumferential edge of the limiting surface is welded to the cover.

2. The battery cover according to claim 1, characterized in that, The limiting surface includes a central area and a side area. The side area surrounds the circumferential outer side of the central area. The central area is connected to the locking post. The orthogonal projection of the injection hole on the limiting post is located within the central area. The side area fits against the cover.

3. The battery cover according to claim 1, characterized in that, The positioning post includes a guide section and a main body section. One end of the main body section is connected to the limiting post, and the other end is connected to the guide section. In the direction from the limiting post to the positioning post, the cross-sectional area of ​​the guide section gradually decreases.

4. The battery cover according to claim 3, characterized in that, The guide section is formed into an inverted frustum-shaped structure.

5. An anti-overflow gasket, applied to the battery cover according to any one of claims 1-4, characterized in that, The anti-overflow pad includes a third surface and a fourth surface opposite to each other. The third surface is in contact with the first surface. The anti-overflow pad is provided with a positioning hole that penetrates the third surface and the fourth surface. The orthographic projection of the injection hole on the positioning hole is located inside the positioning hole.

6. The anti-overflow gasket according to claim 5, characterized in that, The third surface is bonded to the first surface.

7. The anti-overflow gasket according to claim 6, characterized in that, The spill-proof gasket includes a main body layer and an adhesive layer stacked together. The surface of the adhesive layer facing away from the main body layer is a third surface, and the surface of the main body layer facing away from the adhesive layer is a fourth surface. The adhesive layer is bonded to the first surface.

8. The anti-overflow gasket according to claim 7, characterized in that, The main body layer is a porous material layer, which can absorb the electrolyte overflowing from the injection hole.

9. The anti-overflow gasket according to claim 7, characterized in that, The spill-proof gasket also includes an easy-tear portion, which is located on the circumferential outer side of the adhesive layer and connected to the adhesive layer.

10. A battery, characterized in that, include: A battery housing, the battery housing comprising: a housing body and a battery cover according to any one of claims 1-4, the housing body and the battery cover together defining a mounting cavity; The battery cell is installed inside the mounting cavity.

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