Battery air tightness detection fixing device and detection system

Abstract

The utility model belongs to the technical field of battery production, and discloses a battery airtightness detection fixing device and a detection system. The battery airtightness detection fixing device comprises a clamp body and a sealing sleeve, the clamp body is provided with a containing cavity used for containing a battery body, a sealing groove is formed in the end, close to a bottom shell of the battery body, of the clamp body in the axial direction of the battery body, and a sealing space can be formed between the inner wall of the sealing groove and the circumferential direction of the battery body; an air injection hole communicated with the interior of the battery body is formed in one end, away from the bottom shell of the battery body, of the clamp body; one end of the sealing sleeve is in interference connection with the sealed space, and the other end can be communicated with a vacuumizing device. According to the battery airtightness detection fixing device, the sealing sleeve is in interference connection with the circumferential side wall of the battery body and the inner wall of the sealing groove to achieve sealing of the sealing sleeve and the battery body, deformation of the bottom shell of the battery body can be reduced, the sealing effect is better, and airtightness detection of the battery body is more accurate.

Description

Technical Field

[0001] The utility model relates to the technical field of battery production, in particular to a battery air tightness detection and fixing device and a detection system. Background Art

[0002] At present, new energy is booming, and the output of cylindrical batteries is increasing day by day. Abnormal airtightness is one of the common problems in the processing and manufacturing of batteries. Abnormal airtightness will further cause the electrolyte inside the battery to overflow, seriously affecting the safe use performance of the battery, and even causing serious consequences such as explosion and fire.

[0003] The battery air tightness detection device in the prior art often uses a sealing ring to press and fix the battery from top to bottom, so that a closed space is formed between the sealing ring and the bottom shell of the battery, and then the vacuum tube of the detection device is extended into the closed space to perform air tightness detection on the bottom shell of the battery. In this fixing method, the sealing ring will exert a large extrusion force on the bottom shell of the battery, causing the bottom shell of the battery to deform and reduce the flatness of the surface of the bottom shell of the battery, which is not conducive to the air tightness detection and has a large detection error.

[0004] Therefore, there is an urgent need to provide a new battery air tightness detection fixture and detection system to solve the above-mentioned technical problems in the prior art. Utility Model Content

[0005] The utility model aims to provide a battery air tightness detection and fixing device, which can reduce the deformation of the battery shell, has a better sealing effect, and makes the battery air tightness detection more accurate.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] The battery air tightness detection and fixing device includes a fixture body and a sealing sleeve. The fixture body has a accommodating cavity for accommodating the battery body. Along the axial direction of the battery body, a sealing groove is provided at one end of the fixture body close to the bottom shell of the battery body. The inner wall of the sealing groove can form a sealed space with the circumference of the battery body. An air injection hole connected to the inside of the battery body is provided at one end of the fixture body away from the bottom shell of the battery body; one end of the sealing sleeve is interference connected to the sealed space, and the other end can be connected to the vacuum device.

[0008] Optionally, the clamp body comprises two split clamps arranged opposite to each other, the split clamps are provided with a receiving groove, and the inner wall of the receiving groove is surrounded to form the receiving cavity.

[0009] Optionally, along the axial direction of the battery body, a limiting groove is provided at one end of the split clamp away from the bottom shell, and the end of the battery body away from the bottom shell can be fitted and fixed in the limiting groove.

[0010] Optionally, a limiting step is protruded from the inner wall of the accommodating groove toward the circumferential outer wall of the battery body, and the sealing sleeve can abut against a step side wall of the limiting step.

[0011] Optionally, the top wall of the limiting step can abut against the circumferential outer wall of the battery body.

[0012] Optionally, the gas injection hole is coaxially arranged with the battery body.

[0013] Optionally, the sealing sleeve comprises a sealing portion, the sealing portion is interference-connected with the sealing space, and the inner diameter of the sealing portion is smaller than the outer wall of the battery body.

[0014] Optionally, the outer diameter of the sealing portion is smaller than the inner diameter of the sealing groove.

[0015] Optionally, the sealing sleeve is made of an elastic member.

[0016] Another object of the utility model is to provide a battery air tightness detection system, which includes a vacuum pumping device and a battery air tightness detection fixing device as described in any of the above schemes, and the vacuum pumping device is connected to the above sealing sleeve.

[0017] Beneficial effects:

[0018] The battery air tightness detection fixture in the utility model uses the accommodating cavity of the clamp body to accommodate and fix the battery body, and a sealing groove is provided at one end of the bottom shell of the clamp body close to the battery body, and a sealed space is formed between the inner wall of the sealing groove and the circumferential side wall of the battery body, and the sealing sleeve is connected with the sealed space by interference fit, and gas is injected into the battery body through the gas injection hole of the clamp body, and the sealing sleeve is connected with the vacuum device, and the vacuum device vacuumizes the space in the sealing sleeve, so as to detect whether the gas injected into the battery body leaks from the bottom shell, and then detect the air tightness of the battery body. The battery air tightness detection fixture uses the interference fit between the sealing sleeve and the circumferential side wall of the battery body and the inner wall of the sealing groove to achieve the sealing of the sealing sleeve and the battery body, which can reduce the deformation of the bottom shell of the battery body, and has a better sealing effect, and the air tightness detection of the battery body is more accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is an exploded view of a battery air tightness detection and fixing device provided in a specific embodiment of the utility model;

[0020] Figure 2 It is a longitudinal cross-sectional view of a battery air tightness detection and fixing device provided in a specific embodiment of the utility model.

[0021] In the figure:

[0022] 10. Battery body; 11. Bottom shell;

[0023] 100, fixture body; 101, accommodating cavity; 102, air injection hole; 103, sealing groove; 110, split fixture; 111, limiting groove; 112, accommodating groove; 120, limiting step; 121, step side wall; 122, step top wall;

[0024] 200. Sealing sleeve; 210. Sealing part. DETAILED DESCRIPTION

[0025] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0026] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0028] In the description of this embodiment, the terms "upper", "lower", "right", etc., are based on the directions or positions shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0029] Please refer to Figure 1 and Figure 2 The battery air tightness detection and fixing device in this embodiment includes a fixture body 100 and a sealing sleeve 200. The fixture body 100 has a accommodating cavity 101 for accommodating the battery body 10. Along the axial direction of the battery body 10, the end of the fixture body 100 close to the bottom shell 11 of the battery body 10 is provided with a sealing groove 103. The inner wall of the sealing groove 103 can form a sealed space with the circumference of the battery body 10. The end of the fixture body 100 away from the bottom shell 11 of the battery body 10 is provided with an injection hole 102 connected with the inside of the battery body 10; one end of the sealing sleeve 200 is interference connected to the sealed space, and the other end can be connected to the vacuum device.

[0030] The battery air tightness detection and fixing device uses the accommodating cavity 101 of the clamp body 100 to accommodate and fix the battery body 10, and a sealing groove 103 is provided at one end of the clamp body 100 close to the bottom shell 11 of the battery body 10, and a sealed space is formed between the inner wall of the sealing groove 103 and the circumferential side wall of the battery body 10, and the sealing sleeve 200 is interference-connected with the sealed space, and gas is injected into the battery body 10 through the gas injection hole 102 of the clamp body 10, and the sealing sleeve 200 is connected with the vacuum pumping device, and the vacuum pumping device vacuums the space in the sealing sleeve 200, so as to detect whether the gas injected into the battery body 10 leaks from the bottom shell 11, and then detect the air tightness of the battery body 10. The battery airtightness detection fixture uses an interference fit connection between the sealing sleeve 200 and the circumferential side wall of the battery body 10 and the inner wall of the sealing groove 103 to achieve sealing between the sealing sleeve 200 and the battery body 10, which can reduce the deformation of the bottom shell 11 of the battery body 10, and has a better sealing effect, and the airtightness detection of the battery body 10 is more accurate.

[0031] Furthermore, the fixture body 100 includes two relatively arranged split fixtures 110, and the split fixture 110 is provided with a receiving groove 112, and the inner wall of the receiving groove 112 is surrounded by the receiving cavity 101. The two relatively arranged split fixtures 110 can be easily disassembled and assembled, so as to accommodate or remove the battery body 10, thereby improving the test efficiency. It is conceivable that the split fixture 110 can also be provided with more than two, as long as the above-mentioned receiving space can be formed, and no further description is given here.

[0032] In this embodiment, along the axial direction of the battery body 10, a limiting groove 111 is provided at one end of the split clamp 110 away from the bottom shell 11, and the end of the battery body 10 away from the bottom shell 11 can be fixed in the limiting groove 111. The limiting groove 111 can limit and fix the end of the battery body 10, so that the gas injection hole 102 can accurately inject gas into the battery body 10, and after the battery body 10 is limited, the fixing effect is better, which can further improve the sealing effect between the sealing sleeve 200 and the battery body 10.

[0033] Optionally, the inner wall of the accommodating groove 112 is provided with a limiting step 120 protruding toward the circumferential outer wall of the battery body 10, and the sealing sleeve 200 can abut against the step side wall 121 of the limiting step 120. By abutting the sealing sleeve 200 against the limiting step 120, the sealing sleeve 200 can be limited in the axial direction of the battery body 10, avoiding the sealing sleeve 200 from being inserted too deeply to damage the battery body 10, or being not inserted into place, and further ensuring the sealing effect of the sealing sleeve 200.

[0034] In this embodiment, the step top wall 122 of the above-mentioned limiting step 120 can abut against the circumferential outer wall of the above-mentioned battery body 10. The step top wall 122 abuts against the circumferential outer wall of the battery body 10, so that the limiting step 120 can also limit the radial direction of the battery body 10, thereby preventing the battery body 10 from loosening and shaking in the clamp body 100, and improving the fixing effect.

[0035] Please continue to refer to Figure 1 and Figure 2 The sealing sleeve 200 includes a sealing portion 210, which is interference-connected with the sealing space, and the inner diameter of the sealing portion 210 is smaller than the outer wall of the battery body 10. By setting the inner diameter of the sealing portion 210 smaller than the outer wall of the battery body 10, the sealing portion 210 can be interference-connected and sealed with the battery body 10, thereby improving the sealing effect and preventing the bottom shell 11 of the battery body 10 from being squeezed and damaged.

[0036] Furthermore, the outer diameter of the sealing portion 210 is smaller than the inner diameter of the sealing groove 103. Such a configuration enables the sealing portion 210 to achieve interference connection and sealing connection with the sealing groove 103, and the extrusion force applied to the sealing portion 210 by the sealing groove 103 is transmitted to the sealing portion 210 and the outer wall of the battery body 10, thereby improving the sealing effect.

[0037] Optionally, the sealing sleeve 200 is made of an elastic member. Specifically, the sealing sleeve 200 can be made of materials such as silicone and rubber, as long as it has certain elastic contraction and recovery properties. The sealing sleeve 200 made of an elastic member can make the sealing part 210 squeezed by the sealed space, and the elastic squeezing force is used to improve the sealing effect. The sealing sleeve 200 made of an elastic member has a longer service life and is not easy to be damaged.

[0038] Optionally, the gas injection hole 102 is coaxially arranged with the battery body 10. The coaxially arranged gas injection hole 102 is presented as an arc groove in the split fixture 110, and the arc grooves of a plurality of split fixtures 110 together constitute the gas injection hole 102, so that the split fixture 110 is manufactured using a set of molds, realizing mass production, thereby reducing production costs.

[0039] This embodiment also provides a battery air tightness detection system, which includes a vacuum device and a battery air tightness detection fixture as described in any of the above schemes, and the vacuum device is connected and arranged in the above sealing sleeve 200. The battery air tightness detection system has the beneficial effects of the battery air tightness detection fixture as described in any of the above schemes, specifically, the battery air tightness detection system injects gas into the battery body 10 through the gas injection hole 102 of the fixture body 100, and is connected with the vacuum device through the sealing sleeve 200, and the vacuum device vacuumizes the space in the sealing sleeve 200, thereby detecting whether the gas injected into the battery body 10 leaks from the bottom shell 11, and then detecting the air tightness of the battery body 10; and the sealing sleeve 200 and the circumferential side wall of the battery body 10 and the inner wall of the sealing groove 103 are connected by interference fit to realize the sealing of the sealing sleeve 200 and the battery body 10, which can reduce the deformation of the bottom shell 11 of the battery body 10, and the sealing effect is better, and the air tightness detection of the battery body 10 is more accurate.

[0040] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the scope of protection of the present invention. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. A battery air tightness detection fixture, characterized in that: include: A clamp body (100), the clamp body (100) having a receiving cavity (101) for receiving a battery body (10); along the axial direction of the battery body (10), one end of the clamp body (100) close to the bottom shell (11) of the battery body (10) is provided with a sealing groove (103); the inner wall of the sealing groove (103) can form a sealed space with the circumference of the battery body (10); and one end of the clamp body (100) away from the bottom shell (11) of the battery body (10) is provided with a gas injection hole (102) connected with the inside of the battery body (10); A sealing sleeve (200), one end of which is interference-connected to the sealed space, and the other end of which can be connected to a vacuum extraction device.

2. The battery air tightness detection and fixing device according to claim 1, characterized in that: The clamp body (100) comprises two split clamps (110) arranged opposite to each other, the split clamps (110) being provided with a receiving groove (112), and the inner wall of the receiving groove (112) is arranged to form the receiving cavity (101).

3. The battery air tightness detection and fixing device according to claim 2, characterized in that: Along the axial direction of the battery body (10), a limiting groove (111) is provided at one end of the split clamp (110) away from the bottom shell (11), and the end of the battery body (10) away from the bottom shell (11) can be matched and fixed in the limiting groove (111).

4. The battery air tightness detection and fixing device according to claim 2, characterized in that: A limiting step (120) is protruded from the inner wall of the accommodating groove (112) toward the circumferential outer wall of the battery body (10), and the sealing sleeve (200) can abut against a step side wall (121) of the limiting step (120).

5. The battery air tightness detection and fixing device according to claim 4, characterized in that: The step top wall (122) of the limiting step (120) can abut against the circumferential outer wall of the battery body (10).

6. The battery air tightness detection and fixing device according to claim 2, characterized in that: The gas injection hole (102) is coaxially arranged with the battery body (10).

7. The battery air tightness detection and fixing device according to claim 1, characterized in that: The sealing sleeve (200) comprises a sealing portion (210), the sealing portion (210) is interference-connected with the sealing space, and the inner diameter of the sealing portion (210) is smaller than the outer wall of the battery body (10).

8. The battery air tightness detection and fixing device according to claim 7, characterized in that: The outer diameter of the sealing portion (210) is smaller than the inner diameter of the sealing groove (103).

9. The battery air tightness detection and fixing device according to claim 7, characterized in that: The sealing sleeve (200) is made of an elastic member.

10. Battery air tightness detection system, characterized in that: It comprises a vacuum pumping device and a battery air tightness detection and fixing device as described in any one of claims 1 to 9, wherein the vacuum pumping device is connected to the sealing sleeve (200).

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