Sealing structure for battery top cover, top cover, battery and electrical device

Abstract

The utility model belongs to the technical field of battery production and manufacturing, and specifically relates to a sealing structure for a battery top cover, including a liquid injection hole, the liquid injection hole is sealed by a sealing nail, the sealing nail includes a sealing nail cover and a sealing glue nail in sequence in the thickness direction of the sealing structure, the sealing nail cover has a transverse surface perpendicular to the thickness direction, a first sealing groove is provided on the transverse surface, and a second sealing groove is provided on the inner wall of the liquid injection hole in contact with the transverse surface, the first sealing groove and the second sealing groove cooperate with each other to form a closed space, and a sealing member is installed in the closed space to seal the closed space. The utility model seals the closed space by providing a sealing member and cooperates with the sealing nail cover to form a double seal on the liquid injection hole to avoid the risk of leakage. In addition, the utility model also discloses a top cover, a battery and an electrical device including the above-mentioned sealing structure.

Description

Technical Field

[0001] The utility model belongs to the technical field of battery production and manufacturing, and specifically relates to a sealing structure for a battery top cover, a top cover, a battery and an electrical device. Background Art

[0002] Nowadays, with the development of modern society and the enhancement of people's environmental awareness, more and more devices choose lithium-ion batteries as power sources, such as mobile phones, laptops, power tools and electric vehicles, which provides a broad space for the application and development of lithium-ion batteries.

[0003] Among them, in the process of making batteries, it is necessary to fill the batteries with liquid before welding. During the laser welding process, the top cover of the battery forms stress due to thermal expansion and contraction. If the stress cannot be released, the welding stress will remain in the weld. The weld is a flat annular weld, so the stress concentration phenomenon of the weld is obvious. When the welding stress reaches a certain level, there is no redundant space for the stress to be released, and the weld will crack, forming welding cracks, which will lead to the risk of leakage. Therefore, it is urgent to propose a new technical solution to solve the above problems. Utility Model Content

[0004] One of the purposes of the utility model is to provide a sealing structure for a battery top cover in view of the deficiencies of the prior art, which can reduce the possibility of leakage by providing a double sealing structure.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A sealing structure for a battery top cover, comprising a liquid injection hole, the liquid injection hole is sealed by a sealing nail, the sealing nail comprises a sealing nail cover and a sealing glue nail in sequence in the thickness direction of the sealing structure, the sealing nail cover is located above the sealing glue nail, and the sealing nail cover is used for welding with the battery cover plate;

[0007] The sealing nail cover has a transverse surface perpendicular to the thickness direction, a first sealing groove is arranged on the transverse surface, and a second sealing groove is arranged on the inner wall of the injection hole in contact with the transverse surface, the first sealing groove and the second sealing groove cooperate with each other to form a closed space, and a sealing member is installed in the closed space to seal the closed space.

[0008] In the utility model, the position of the enclosed space is at a certain distance from the welding position of the sealing nail cover and is not located in the same plane. The sealing nail cover and the sealing member form a double seal for the liquid injection hole. When cracks are generated at the welding position of the sealing nail cover due to stress, the sealing member can still seal the liquid injection hole, thereby preventing leakage and increasing the stability and safety of the sealing structure. At the same time, the sealing nail cover can prevent the sealing nail from popping out and shifting, thereby further increasing the stability of the sealing structure.

[0009] As an improvement to the sealing structure for the battery top cover described in the utility model, the sealing nail cover is a step structure, and the injection hole in contact with the sealing nail cover is arranged as a step structure symmetrical with the center of the sealing nail cover, that is, the sealing nail cover matches the structure of the injection hole in contact with it, and the contact surfaces of the two are consistent with each other, which can further increase the sealing performance of the sealing structure.

[0010] As an improvement of the sealing structure for the battery top cover described in the utility model, the transverse surface is parallel to the thickness direction, the transverse surface includes a first transverse surface and a second transverse surface, the second transverse surface is connected to the sealing glue nail, and the first sealing groove is arranged on the first transverse surface and / or the second transverse surface. The first sealing groove is arranged on the transverse surface for easy installation.

[0011] As an improvement of the sealing structure for the battery top cover described in the utility model, the first sealing groove and the second sealing groove are configured as a continuous structure arranged around the sealing pin, further ensuring the sealing of the enclosed space and the sealing member.

[0012] As an improvement of the sealing structure for the battery top cover described in the utility model, the structure of the first sealing groove and the second sealing groove is one of an annular groove, a square groove and a rectangular groove, and the structure of the first sealing groove and the second sealing groove match and have the same size to ensure the sealing of the enclosed space.

[0013] As an improvement of the sealing structure for the battery top cover described in the utility model, the sealing member is one of a circular sealing ring, an elliptical sealing ring, an annular gasket-shaped sealing ring, a square sealing ring, a rectangular sealing ring and a sealing gasket.

[0014] As an improvement of the sealing structure for the battery top cover described in the utility model, the sealing nail is at least partially exposed to the injection hole in the direction away from the sealing nail cover. In actual application, the sealing nail is arranged close to the battery cell to seal the injection hole after one injection.

[0015] The second purpose of the utility model is to provide a battery top cover, comprising a cover plate and the sealing structure for the battery top cover as described above, which is arranged on the cover plate.

[0016] The third object of the present utility model is to provide a battery, comprising the battery top cover as described above.

[0017] A fourth object of the present utility model is to provide an electrical device comprising the battery as described above.

[0018] The beneficial effect of the utility model is that the sealing structure for the battery top cover of the utility model includes a liquid injection hole, and the liquid injection hole is sealed by a sealing nail, and the sealing nail includes a sealing nail cover and a sealing glue nail in sequence in the thickness direction of the sealing structure, and the sealing nail cover is located above the sealing glue nail; the sealing nail cover has a transverse surface perpendicular to the thickness direction, and a first sealing groove is arranged on the transverse surface, and a second sealing groove is arranged on the inner wall of the liquid injection hole in contact with the transverse surface, and the first sealing groove and the second sealing groove cooperate with each other to form a closed space, and a sealing member is installed in the closed space to seal the closed space. The utility model forms a double sealing structure by setting a closed space and a sealing member to cooperate with the sealing nail cover. First, the sealing nail cover can prevent the sealing glue nail from popping out and shifting; secondly, when there is a crack at the welding part of the sealing nail cover, the closed space and the sealing member can make the sealing nail cover and the liquid injection hole sealed and connected, thereby strengthening the sealing of the sealing structure and reducing the possibility of leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The features, advantages and technical effects of exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.

[0020] Figure 1 It is a schematic diagram of the cross-sectional structure of the utility model.

[0021] Figure 2 It is a structural schematic diagram of the sealing member in the utility model.

[0022] The reference numerals are described as follows:

[0023] 1-liquid injection hole; 11-second sealing groove;

[0024] 2-sealing nail; 21-sealing nail cover; 211-transverse surface; 212-first transverse surface; 213-second transverse surface; 22-sealing nail; 23-first sealing groove;

[0025] 3- Confined space;

[0026] 4- Seals;

[0027] 100-cover plate;

[0028] H - thickness direction. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0030] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific implementation methods and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0031] Reference to "embodiment" in this application means that a particular feature, structure or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments.

[0032] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" 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 direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0033] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0034] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0035] In the manufacturing process of the battery, the sealing pins need to be welded after two injections, and the sealing nails used for the first injection seal will be pulled out during the second injection and then installed. It is not a completely sealed structure. The sealing nail cover after the second injection seals the injection hole, but when the sealing nail cover is welded to the cover plate, the welding stress will remain in the weld and form welding cracks at the welding of the sealing nail cover, which poses a risk of leakage. For this reason, the inventor sets up a confined space and a seal, which cooperates with the sealing nail cover to form a double sealing structure. First, the sealing nail cover can prevent the sealing nail from popping out and shifting; secondly, when there are cracks at the welding of the sealing nail cover, the seal can also be squeezed by the sealing nail cover and the sealing nail to play a sealing role, thereby avoiding the risk of leakage.

[0036] The following is combined with Figures 1-2 The utility model is further described in detail with specific implementation modes, but is not intended to limit the utility model.

[0037] A sealing structure for a battery top cover, comprising a liquid injection hole 1, the liquid injection hole 1 is sealed by a sealing nail 2, the sealing nail 2 sequentially comprises a sealing nail cover 21 and a sealing glue nail 22 in a thickness direction H of the sealing structure, and the sealing nail cover 21 is located above the sealing glue nail 22;

[0038] The sealing nail cover 21 has a transverse surface 211 perpendicular to the thickness direction H, and a first sealing groove 23 is arranged on the transverse surface 211. The inner wall of the injection hole 1 in contact with the transverse surface 211 is provided with a second sealing groove 11. The first sealing groove 23 and the second sealing groove 11 cooperate with each other to form a closed space 3, and a sealing member 4 is installed in the closed space 3 to seal the closed space 3.

[0039] In this embodiment, the sealing nail cover 21 and the sealing member 4 form a double seal for the injection hole 1. First, the sealing nail cover 21 can prevent the sealing nail 22 from popping out and shifting. Secondly, when the welding part of the sealing nail cover 21 is cracked due to stress, the sealing member 4 can still seal the injection hole 1, thereby preventing leakage and increasing the stability and safety of the sealing structure. The position of the enclosed space 3 is at a certain distance from the welding position of the sealing nail cover 21 and is not located in the same plane. The distance is set according to the depth of the injection hole 1, thereby preventing the welding stress from acting on the enclosed space 3 when the sealing nail cover 21 is welded, thereby causing cracks in the enclosed space 3, thereby further ensuring the airtightness of the sealing structure.

[0040] Preferably, the sealing nail cover 21 is a step structure, and the injection hole 1 in contact with the sealing nail cover 21 is set as a step structure symmetrical to the center of the sealing nail cover 21. The two structures match and the contact surfaces are consistent, which can ensure the formation of the enclosed space 3 and further improve the sealing performance of the sealing structure.

[0041] In this embodiment, the transverse surface 211 includes a first transverse surface 212 and a second transverse surface 213, the second transverse surface 213 is connected to the sealing glue nail 22, and the first sealing groove 23 is arranged on the first transverse surface 212 and / or the second transverse surface 213. The first sealing groove 23 is arranged on the transverse surface 211 for easy installation; it can be understood that in some other embodiments, the transverse surface 211 can include multiple first transverse surfaces 212, according to actual needs; it can be understood that the first sealing groove 23 can be arranged on the side of the sealing nail cover 21, and the second sealing groove 11 is correspondingly arranged on the side wall of the injection hole 1, which can also achieve the effect of double sealing, but increases the difficulty of assembly.

[0042] Preferably, the first sealing groove 23 and the second sealing groove 11 are configured as a continuous structure disposed around the sealing pin 2 and the two have the same size. The configuration of the continuous structure can ensure the sealing of the enclosed space 3 formed by the two.

[0043] Preferably, the structure of the first sealing groove 23 and the second sealing groove 11 is one of an annular groove, a square groove and a rectangular groove; the seal 4 is one of a circular sealing ring, an elliptical sealing ring, an annular gasket-shaped sealing ring, a square sealing ring, a rectangular sealing ring and a sealing gasket; it can be understood that the seal 4 and the enclosed space 3 can also choose other shapes, as long as they are continuous and match each other, and can be adjusted according to actual conditions without making specific settings.

[0044] Preferably, at least a portion of the sealing nail 22 is exposed outside the injection hole 1 in a direction away from the sealing nail cover 21 , so as to further enhance the sealing performance of the sealing structure.

[0045] Battery cover

[0046] A battery top cover includes a cover plate 100 and a sealing structure for the battery top cover as described above, which is arranged on the cover plate 100. It can be understood that, according to actual needs and structural requirements of the battery, the cover plate 100 can also be provided with structures such as explosion-proof valves and poles.

[0047] Battery

[0048] A battery comprises the battery top cover as described above, and the battery may be a lithium ion battery, a sodium ion battery, a magnesium ion battery, etc.

[0049] Electrical devices

[0050] An electrical device, including a battery as described above, can be a vehicle, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, an electric tool, etc. The vehicle can be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc.; the spacecraft includes an airplane, a rocket, a space shuttle and a spacecraft, etc.; the electric toy includes a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy and an electric airplane toy, etc.; the electric tool includes a metal cutting electric tool, a grinding electric tool, an assembly electric tool and a railway electric tool, such as an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact drill, a concrete vibrator and an electric planer, etc. The embodiments of the present application do not impose any special restrictions on the above-mentioned electrical devices.

[0051] According to the disclosure and teaching of the above description, the technicians in the field of the utility model can also change and modify the above implementation. Therefore, the utility model is not limited to the above specific implementation, and any obvious improvement, replacement or modification made by the technicians in this field on the basis of the utility model belongs to the protection scope of the utility model. In addition, although some specific terms are used in this specification, these terms are only for the convenience of explanation and do not constitute any limitation to the utility model.

Claims

1. A sealing structure for a battery top cover, comprising a liquid injection hole (1), wherein the liquid injection hole (1) is sealed by a sealing nail (2), wherein the sealing nail (2) comprises a sealing nail cover (21) and a sealing glue nail (22) in sequence in a thickness direction (H) of the sealing structure, wherein the sealing nail cover (21) is located above the sealing glue nail (22), and the sealing nail cover (21) is used for welding with the battery top cover, characterized in that: The sealing nail cover (21) has a transverse surface (211) perpendicular to the thickness direction (H), and a first sealing groove (23) is arranged on the transverse surface (211). The inner wall of the injection hole (1) in contact with the transverse surface (211) is provided with a second sealing groove (11), and the first sealing groove (23) and the second sealing groove (11) cooperate with each other to form a closed space (3), and a sealing member (4) is installed in the closed space (3).

2. The sealing structure for a battery top cover according to claim 1, characterized in that: The sealing nail cover (21) is a stepped structure, and the injection hole (1) in contact with the sealing nail cover (21) is arranged as a stepped structure that is symmetrical with the center of the sealing nail cover (21).

3. The sealing structure for a battery top cover according to claim 1, characterized in that: The transverse surface (211) comprises a first transverse surface (212) and a second transverse surface (213), the second transverse surface (213) is connected to the sealing nail (22), and the first sealing groove (23) is arranged on the first transverse surface (212) and / or the second transverse surface (213).

4. The sealing structure for a battery top cover according to claim 1, characterized in that: The first sealing groove (23) and the second sealing groove (11) are arranged as a continuous structure arranged around the sealing pin (2).

5. The sealing structure for a battery top cover according to claim 1, characterized in that: The structures of the first sealing groove (23) and the second sealing groove (11) are one of an annular groove, a square groove and a rectangular groove.

6. The sealing structure for a battery top cover according to claim 1, characterized in that: The sealing member (4) is one of a circular sealing ring, an elliptical sealing ring, an annular gasket-shaped sealing ring, a square sealing ring, a rectangular sealing ring and a sealing gasket.

7. The sealing structure for a battery top cover according to claim 1, characterized in that: At least a portion of the sealing glue nail (22) is exposed outside the liquid injection hole (1) in a direction away from the sealing nail cover (21).

8. A battery top cover, characterized in that: The invention comprises a cover plate (100) and a sealing structure for a battery top cover as claimed in any one of claims 1 to 7, which is arranged on the cover plate (100).

9. A battery, characterized in that: Comprising the battery top cover as claimed in claim 8.

10. An electrical device, characterized in that: Comprising the battery as claimed in claim 9.

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