Sealing cover assembly of battery and battery

Abstract

The utility model belongs to the technical field of batteries, and particularly relates to a sealing cover assembly of a battery, which comprises a first cover body, the first cover body is provided with a first through hole penetrating through the first cover body, a second cover body, an air bag body and a sealing element are sequentially accommodated in the first through hole, the air bag body is arranged between the second cover body and the sealing element, and first detection gas is arranged in the air bag body. The hole wall of the first through hole is provided with a first step and a second step which are connected, the second cover body is arranged on the first step and connected with the first step in a sealed mode, the second cover body covers and seals an opening of the first through hole, and the sealing piece is fixedly arranged on the second step and blocks the first through hole. According to the utility model, the air tightness of the battery top cover structure can be guaranteed, and the air tightness of the liquid injection hole part in the battery top cover can be effectively detected. In addition, the utility model also discloses a battery.

Description

Technical Field

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

[0002] In existing battery products, the battery cell is sequentially filled with liquid for the first time, opened for formation, and filled with liquid for the second time, and then the battery cell is welded and sealed. However, since the liquid injection hole on the top cover of the battery may have a poor seal, the battery cell with a poor seal may flow into the market and cause safety hazards to the corresponding electrical products. At the same time, the existing battery cannot effectively detect the poor seal of the liquid injection hole on the top cover. Therefore, it is urgent to propose a new technical solution to solve the above problems. Utility Model Content

[0003] One of the purposes of the utility model is to provide a battery sealing cover assembly to address the deficiencies of the prior art, which can not only ensure the airtightness of the battery top cover, but also effectively detect the airtightness of the injection hole in the battery top cover.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A sealing cover assembly of a battery, comprising a first cover body, wherein the first cover body has a first through hole penetrating the first cover body, a second cover body, an air bag body and a sealing member are sequentially accommodated in the first through hole, the air bag body is arranged between the second cover body and the sealing member, and a first detection gas is contained in the air bag body;

[0006] The hole wall of the first through hole has a first step and a second step connected to each other, the second cover body is arranged on the first step and is sealed with the first step, the second cover body covers and seals the opening of the first through hole, and the sealing member is fixedly arranged on the second step and blocks the first through hole.

[0007] As an improvement of the sealing cover assembly of the battery of the utility model, the second cover body and the sealing member form a first cavity, the airbag body is accommodated in the first cavity, and the longitudinal section of the first cavity is semi-elliptical or rectangular.

[0008] As an improvement of the sealing cover assembly of the battery of the utility model, the side of the sealing member facing the second cover body is concave to form the first cavity.

[0009] As an improvement of the sealing cover assembly of the battery of the utility model, the second cover body includes a first connecting portion and a first fitting portion connected to each other, the first connecting portion is sealingly connected to the first step, at least part of the sealing member is fitted to the first fitting portion, and the first connecting portion, the first fitting portion and the sealing member enclose and form the first cavity.

[0010] As an improvement of the sealing cover assembly of the battery of the utility model, the second cover body and the sealing member are relatively separated and enclose the first cavity.

[0011] As an improvement of the sealing cover assembly of the battery of the utility model, the sealing member has a first extension portion abutting against the second step, and a ventilation channel or a ventilation gap connected to the first cavity is provided between the first extension portion or the first extension portion and the second cover body.

[0012] As an improvement of the sealing cover assembly of the battery of the utility model, the airbag body is adhered to the second cover body and / or the sealing member.

[0013] As an improvement of the sealing cover assembly of the battery of the utility model, the melting point of the airbag body is 70°C to 230°C, and the melting point of the second cover body is at least 660°C.

[0014] As an improvement of the sealing cover assembly of the battery of the utility model, the first detection gas is nitrogen, hydrogen or an inert gas, and the inert gas is one of helium, neon, argon, krypton, xenon or radon.

[0015] The second objective of the present utility model is to provide a battery, comprising the sealing cover assembly as described above.

[0016] The beneficial effects of the utility model are as follows: the sealing cover assembly of the battery of the utility model comprises a first cover body, the first cover body has a first through hole penetrating the first cover body, the first through hole sequentially accommodates a second cover body, an airbag body and a sealing member, the airbag body is arranged between the second cover body and the sealing member, a first detection gas is arranged in the airbag body, the hole wall of the first through hole has a first step and a second step connected to each other, the second cover body is arranged on the first step and is sealedly connected to the first step, the second cover body covers and seals the hole opening of the first through hole, the sealing member is fixedly arranged on the second step and blocks the first through hole, wherein, when ensuring the second When the cover body seals the opening of the first through hole and the sealing member seals the channel of the first through hole, the first detection gas in the airbag body between the second cover body and the sealing member is released by corresponding means, so that the first detection gas can be filled between the second cover body and the sealing member. If the first through hole is poorly sealed, the airtightness of the sealing position can be effectively detected by detecting whether the first detection gas leaks out. At the same time, the first step and the second step in the sealing cover assembly can increase the sealing area and sealing firmness of the sealing position, thereby ensuring that the sealing cover assembly has excellent sealing performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the structure of Example 1 of the utility model.

[0018] Figure 2 This is a cross-sectional view of the first cover body of Example 1 of the utility model.

[0019] Figure 3 This is a schematic diagram of the structure of Example 2 of the utility model.

[0020] Figure 4 This is a schematic diagram of the structure of Example 3 of the utility model.

[0021] Among them: 1. first cover body; 2. second cover body; 3. airbag body; 4. sealing member; 5. first cavity; 10. first through hole; 11. first step; 12. second step; 21. first connecting part; 22. first fitting part; 41. first extending part. DETAILED DESCRIPTION

[0022] If certain words are used in the specification and claims to refer to specific components, those skilled in the art should understand that manufacturers may use different terms to refer to the same component. This specification and claims do not use differences in names as a way to distinguish components, but use differences in the functions of components as the criteria for distinction. As mentioned in the entire specification and claims, "including" is an open term, so it should be interpreted as "including but not limited to". In the utility model, unless otherwise clearly specified and limited, the terms "connected", "connected", "fixed" and the like 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 directly connected, or indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the utility model can be understood according to the specific circumstances.

[0023] The following is combined with Figures 1 to 4 The utility model is further described in detail with specific embodiments, but is not intended to limit the utility model.

[0024] Example 1

[0025] A sealing cover assembly of a battery, such as Figures 1-2 As shown, it includes a first cover body 1, the first cover body 1 has a first through hole 10 penetrating the first cover body 1, the first through hole 10 sequentially accommodates a second cover body 2, an airbag body 3 and a sealing member 4, the airbag body 3 is arranged between the second cover body 2 and the sealing member 4, the airbag body 3 has a first detection gas, the hole wall of the first through hole 10 has a first step 11 and a second step 12 connected to each other, the second cover body 2 is arranged on the first step 11 and is sealed with the first step 11, the second cover body 2 covers and seals the hole opening of the first through hole 10, and the sealing member 4 is fixedly arranged on the second step 12 and blocks the first through hole 10.

[0026] Since the second cover body 2 can seal the opening of the first through hole 10 and the sealing member 4 can seal at least part of the hole of the first through hole 10, the first detection gas in the airbag body 3 arranged between the second cover body 2 and the sealing member 4 is released through corresponding high-temperature means, so that the first detection gas can be filled between the second cover body 2 and the sealing member 4. If the first through hole 10 is poorly sealed, the detection equipment can be used to detect whether the first detection gas leaks from the above-mentioned sealing position, thereby effectively detecting the airtightness of the sealing position in the sealing cover assembly.

[0027] Preferably, the first through hole 10 is the liquid injection hole of the battery, and the sealing member 4 is a sealing nail. In actual production, since the sealing nail has a certain sealing effect on the liquid injection hole, the first detection gas in the battery shell cannot escape from the inside of the battery cell to between the liquid injection hole and the second cover body 2. In this way, even if there is an abnormality in the sealing of the second cover body 2, it cannot be detected, thereby causing poorly sealed battery cells to flow into the market, posing a safety hazard. The airbag body 3 in this scheme will not fall into the battery cell after being crushed at high temperature due to the barrier effect of the sealing nail, and the escape of the first detection gas in the airbag body 3 in this scheme can provide a detection basis for the sealing of the second cover body 2. If the second cover body 2 and the first step 11 of the first through hole 10 are poorly sealed, the first detection gas can escape from the poorly sealed position of the second cover body 2, thereby being detected by relevant equipment and avoiding the poorly sealed battery cell from flowing into the subsequent process.

[0028] Preferably, the height of the first step 11 is the same as the height of the second cover body 2 .

[0029] Preferably, the second cover body 2 and the sealing member 4 are fitted together to form a first cavity 5, and the airbag body 3 is accommodated in the first cavity 5, and the side of the sealing member 4 facing the second cover body 2 is concave to form the first cavity 5, so that the first cavity 5 is opened on the side of the sealing member 4 facing the second cover body 2, and at the same time, the volume of the groove on the top of the sealing member 4 is larger than the volume of the airbag body 3, so that the airbag body 3 is not easily damaged by the external force generated by machining.

[0030] Preferably, the longitudinal section of the first cavity 5 is semi-elliptical or rectangular.

[0031] Preferably, the sealing member 4 has a first extension portion 41 abutting against the second step 12, the height of the second step 12 is the same as that of the first extension portion 41, the first extension portion 41 has an air permeable passage connected to the first cavity 5, or a micron-level air permeable gap connected to the first cavity 5 is provided between the first extension portion 41 and the second cover body 2, so that the first detection gas of the airbag body 3 after being broken at high temperature can escape to the edge of the sealing position of the second cover body 2 and the first step 11 through the air permeable passage or the air permeable gap, thereby preventing the first detection gas from being unable to further escape to the desired detection position in the first cavity 5.

[0032] Preferably, the airbag body 3 is adhered to the second cover body 2 and / or the seal 4. The material of the airbag body 3 can be TPU high-barrier ball film. Thermoplastic polyurethane elastomer rubber has the characteristics of light weight, good elasticity, high tear strength, and high sensitivity to heat. The airbag body 3 has excellent anti-scratch ability and is difficult to be damaged by collision during mechanical processing, which facilitates its use in automated production and processing.

[0033] Preferably, the melting point of the airbag body 3 is 70°C to 230°C, the tear strength of the surface of the airbag body 3 is at least 250N / mm, the tear strength is tested according to ASTMD624 standard, and the surface thickness of the airbag body 3 is 0.02mm to 0.2mm. The melting point of the second cover body 2 is at least 660°C.

[0034] Preferably, the first detection gas is nitrogen, hydrogen or an inert gas, the inert gas is one of helium, neon, argon, krypton, xenon or radon, and the first detection gas is a gas that does not react with substances in the battery.

[0035] Specifically, taking the large cylinder 40135 as an example, after the winding core is welded to the positive and negative current collecting plates, it is placed in the aluminum shell, and the aluminum shell is welded to the positive and negative cover plates, one of which is the above-mentioned sealing cover assembly; after the welded battery cell has undergone the initial liquid injection, opening formation, secondary liquid injection and other processes, the battery cell needs to be sealed; first, the first through hole 10 is blocked with the seal 4, and then the airbag body 3 is set between the second cover body 2 and the seal 4, and the first detection gas in the airbag body 3 is helium, and then the second cover body 2 is embedded with the seal 4, and a laser welding device is used to weld a circle near the second cover body 2. The heat generated during the welding of the sealing cover can cause the airbag body 3 to break at high temperature and the helium therein to escape. Finally, the welding effect of the second cover body 2 can be detected by the helium detection equipment. If the second cover body 2 is poorly welded, the helium will escape from the poorly sealed position and be detected by the helium detection equipment, thereby preventing the poorly sealed battery cell from flowing into the subsequent process.

[0036] Example 2

[0037] Different from Example 1, see Figure 3 The second cover body 2 includes a first connecting portion 21 and a first fitting portion 22 connected to each other, the first connecting portion 21 is sealingly connected to the first step 11, at least part of the sealing member 4 is fitted to the first fitting portion 22, the first connecting portion 21, the first fitting portion 22 and the sealing member 4 enclose a first cavity 5, and the structure of the second cover body 2 is improved by opening the first cavity 5 on the side of the second cover body 2 facing the sealing member 4, so that the airbag body 3 can be stably accommodated in the first cavity 5 enclosed by the first connecting portion 21, the first fitting portion 22 and the sealing member 4, and the first fitting portion 22 and the first extension portion 41 can play a certain limiting role on the airbag body 3.

[0038] The other structures of this embodiment are the same as those of Embodiment 1 and will not be described again here.

[0039] Example 3

[0040] Different from Example 1, see Figure 4The second cover body 2 and the sealing member 4 are relatively separated and enclosed to form a first cavity 5, and the airbag body 3 is accommodated in the first cavity 5, and the first cavity 5 is a rectangular cavity, so that a rectangular cavity is provided between the second cover body 2 and the sealing member 4, and at the same time, the height of the first extension portion 41 of the sealing member 4 is less than the height of the second step 12.

[0041] The other structures of this embodiment are the same as those of Embodiment 1 and will not be described again here.

[0042] Example 4

[0043] A battery comprises the sealing cover assembly of any one of embodiments 1 to 3, wherein the battery cell is arranged in a conductive shell, the conductive shell is connected to the sealing cover assembly, and the battery cell can be a full-tab battery cell.

[0044] Specifically, the battery can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a magnesium ion battery, etc.; and the battery can be a square battery or a cylindrical battery.

[0045] According to the disclosure and teaching of the above description, those skilled in the art to which the utility model belongs 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 those skilled in the art 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 description and do not constitute any limitation to the utility model.

Claims

1. A sealing cover assembly of a battery, characterized in that: include: A first cover body (1) having a first through hole (10) penetrating the first cover body (1); The first through hole (10) sequentially accommodates a second cover body (2), an airbag body (3) and a sealing member (4); the airbag body (3) is arranged between the second cover body (2) and the sealing member (4); and the airbag body (3) contains a first detection gas; The hole wall of the first through hole (10) comprises a first step (11) and a second step (12) connected to each other; the second cover body (2) is arranged on the first step (11) and is sealed to the first step (11); the second cover body (2) covers and seals the hole opening of the first through hole (10); and the sealing member (4) is fixedly arranged on the second step (12) and blocks the first through hole (10).

2. The sealing cover assembly of a battery as claimed in claim 1, characterized in that: The second cover body (2) and the sealing member (4) form a first cavity (5), the airbag body (3) is accommodated in the first cavity (5), and the longitudinal section of the first cavity (5) is semi-elliptical or rectangular.

3. The sealing cover assembly of a battery as claimed in claim 2, characterized in that: The side of the sealing member (4) facing the second cover body (2) is concave to form the first cavity (5).

4. The sealing cover assembly of a battery as claimed in claim 2, characterized in that: The second cover body (2) comprises a first connecting portion (21) and a first fitting portion (22) connected to each other, the first connecting portion (21) is sealingly connected to the first step (11), at least a portion of the sealing member (4) is fitted to the first fitting portion (22), and the first connecting portion (21), the first fitting portion (22) and the sealing member (4) enclose and form the first cavity (5).

5. The sealing cover assembly of a battery as claimed in claim 2, characterized in that: The second cover body (2) and the sealing member (4) are relatively spaced apart to form the first cavity (5).

6. The sealing cover assembly of a battery according to any one of claims 2 to 4, characterized in that: The sealing member (4) has a first extension portion (41) abutting against the second step (12), and a ventilation channel or a ventilation gap communicating with the first cavity (5) is provided between the first extension portion (41) or between the first extension portion (41) and the second cover body (2).

7. The sealing cover assembly of a battery according to any one of claims 1 to 5, characterized in that: The airbag body (3) is adhered to the second cover body (2) and / or the sealing member (4).

8. The sealing cover assembly of a battery according to any one of claims 1 to 5, characterized in that: The melting point of the airbag body (3) is 70°C to 230°C, and the melting point of the second cover body (2) is at least 660°C.

9. The sealing cover assembly of a battery according to any one of claims 1 to 5, characterized in that: The first detection gas is nitrogen, hydrogen or an inert gas.

10. A battery, characterized in that: The invention comprises a sealing cover assembly as claimed in any one of claims 1 to 9.

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