Air tightness detection device for battery box

Abstract

The utility model discloses an air tightness detection device for a battery box. The air tightness detection device comprises a battery box body, a supporting assembly, an anti-explosion valve and an air tightness detection assembly, wherein an opening is formed in the surface of the battery box body; the supporting assembly is arranged on the battery box body, and an avoiding space corresponding to the opening is formed in the supporting assembly; the anti-explosion valve is installed in the avoiding space of the supporting assembly and attached to the outer surface of the opening edge, and a first sealing element is arranged in a gap between the anti-explosion valve and the outer surface of the opening edge. The air sealing detection assembly comprises a sealing cover and an inflation part, the sealing cover is arranged on the supporting assembly, a second sealing element is arranged in a gap between the sealing cover and the anti-explosion valve, and the inflation part is used for inflating the sealing cover. The battery box air tightness detection device disclosed by the utility model can solve the problem of leak detection of the sealing connection part of the anti-explosion valve and the battery box body in the prior art.

Description

TECHNICAL FIELD

[0001] The utility model relates to airtightness detection technical field, specifically, relate to a battery box airtightness detection device. BACKGROUND

[0002] At present, power supply equipment such as battery pack mainly carries out airtightness detection by installing explosion-proof valve, fills air into battery pack by the air permeable membrane of explosion-proof valve, but needs to seal explosion-proof valve. The prior art mainly covers explosion-proof valve as a whole completely by sealing device outside explosion-proof valve, forms sealing surface between sealing device and battery box body to test. But the sealing connection between explosion-proof valve and box body is also covered in sealing device, leading to missed detection of the sealing connection between explosion-proof valve and box body, even if testing is passed, explosion-proof valve and box body cannot be completely sealed. SUMMARY

[0003] The utility model mainly aims at providing a battery box airtightness detection device to at least solve the problem of missed detection of the sealing connection between explosion-proof valve and battery box body.

[0004] According to one aspect of the utility model, a battery box airtightness detection device is provided, characterized by comprising:

[0005] Battery box, the surface of battery box is provided with opening;

[0006] Support assembly, the support assembly is arranged on battery box, and the support assembly is provided with the avoiding space corresponding to the opening;

[0007] Explosion-proof valve, the explosion-proof valve is installed in the avoiding space of support assembly and is attached to the outer surface of opening edge, and the gap between explosion-proof valve and the outer surface of opening edge is provided with first sealing element;

[0008] Airtightness detection assembly, the airtightness detection assembly includes sealing cover and inflation part, the sealing cover is arranged on the support assembly, and the gap between the sealing cover and the explosion-proof valve is provided with second sealing element, and the inflation part is used to fill air into the sealing cover.

[0009] Further, the support assembly includes a plurality of support parts, and the plurality of support parts are arranged around the outer circumferential surface of the explosion-proof valve and fixed on the battery box.

[0010] Further, the support assembly includes two support parts, each of the support parts is arranged in U shape, V shape or C shape, and the two support parts are connected and arranged to form the avoiding space.

[0011] Further, the outer peripheral side surface of the explosion-proof valve is provided with a matching flange, and one end of the support part close to the avoiding space is attached to one side of the matching flange close to the opening.

[0012] Further, the first sealing element comprises a first sealing ring arranged on one side of the explosion-proof valve (30) close to the opening to seal the gap between the outer surface of the explosion-proof valve and the opening edge.

[0013] Further, the second sealing element comprises a second sealing ring.

[0014] Further, the explosion-proof valve is provided with a gas permeable film for pressure balance adjustment between the battery box and the sealing cover.

[0015] Further, the device further comprises a connecting assembly which is sequentially connected with the sealing cover, the support assembly and the battery box.

[0016] Further, the connecting assembly comprises at least one of a bolt, a screw or a stud.

[0017] Further, the inflation part comprises an inflation valve configured as a one-way inflation valve for inflating the sealing cover.

[0018] In the utility model, the support assembly with the avoiding space corresponding to the opening of the battery box is arranged, so that the explosion-proof valve can be installed in the avoiding space and attached to the outer surface of the opening edge. The first sealing element arranged between the explosion-proof valve and the outer surface of the opening edge of the battery box can ensure the sealing property between the explosion-proof valve and the battery box. The second sealing element arranged in the gap between the sealing cover of the gas sealing detection assembly and the explosion-proof valve can expose the sealing connection between the explosion-proof valve and the battery box to the outside of the sealing cover. When the gas tightness of the battery box is detected, the gas tightness of the sealing connection between the explosion-proof valve and the battery box can also be detected. The connection between the support assembly and the sealing cover is also exposed to the outside of the sealing cover, so that the gas tightness of the connection between the support assembly and the sealing cover can also be detected. The present application can effectively solve the problem that the connection between the explosion-proof valve and the battery box is completely covered in the gas tightness tool in the prior art, thereby improving the reliability of the battery box gas tightness detection. BRIEF DESCRIPTION OF DRAWINGS

[0019] The drawings described herein are used to provide further understanding of the utility model and constitute a part of the utility model. The illustrative embodiments of the utility model and the description thereof are used to explain the utility model and do not constitute improper limitation on the utility model. In the drawings:

[0020] Figure 1 A perspective view of a battery box airtightness detection device is disclosed in the embodiments of the present application.

[0021] Figure 2 A partial structure explosion view of a battery box airtightness detection device is disclosed in the embodiments of the present application.

[0022] Figure 3 A partial assembly view of a battery box airtightness detection device is disclosed in the embodiments of the present application.

[0023] Figure 4 A partial sectional view of a battery box airtightness detection device is disclosed in the embodiments of the present application.

[0024] Figure 5 A front view and a rear view of an explosion-proof valve are disclosed in the embodiments of the present application.

[0025] Figure 6 A partial structure schematic view of an airtightness detection device in the prior art is disclosed in the embodiments of the present application.

[0026] Among the above-mentioned drawings, the following drawing marks are included:

[0027] 10, battery box; 11, opening; 20, support assembly; 21, support part; 22, avoiding space; 30, explosion-proof valve; 31, first sealing element; 32, matching flange; 40, airtightness detection assembly; 41, sealing cover; 42, inflation part; 43, second sealing element; 50, connecting assembly. DETAILED DESCRIPTION

[0028] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0029] It should be noted that the terms used herein are only for describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form unless the context clearly indicates otherwise, and it should also be understood that when the terms "comprise" and / or "include" are used in the specification, there is a feature, step, operation, device, component and / or combination thereof.

[0030] The relative arrangement of parts and steps, numerical expressions, and numerical values set forth in the Examples are not intended to limit the scope of the present application unless specifically stated otherwise. Also, it is to be understood that the dimensions of the various parts shown in the drawings are not drawn to scale for ease of illustration. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art can not be discussed in detail, but should be considered within the scope of the present application. In all examples shown and discussed herein, any specific value is to be interpreted as illustrative only and not as a limitation. Thus, other examples of exemplary embodiments can have different values. It is to be noted that like numbers and letters refer to like elements throughout the several views of the drawings, and that the use of or insertion of a reference character in the drawings indicates further discussion of a previously defined item.

[0031] Referring to Figures 1 to 5 As shown, according to the embodiments of the present application, a battery box airtightness detection device is provided, comprising a battery box body 10, a support assembly 20, an explosion-proof valve 30 and an airtightness detection assembly 40.

[0032] Wherein, the surface of the battery box body 10 is provided with an opening 11; the support assembly 20 is arranged on the battery box body 10, and the support assembly 20 is provided with a relief space 22 corresponding to the opening 11; the explosion-proof valve 30 is installed in the relief space 22 of the support assembly 20 and is attached to the outer surface of the edge of the opening 11, and a first sealing element 31 is arranged in the gap between the explosion-proof valve 30 and the outer surface of the edge of the opening 11; the airtightness detection assembly 40 comprises a sealing cover 41 and an inflation part 42, the sealing cover 41 is arranged on the support assembly 20, and a second sealing element 43 is arranged in the gap between the sealing cover 41 and the explosion-proof valve 30, and the inflation part 42 is used to inflate the sealing cover 41.

[0033] Specifically, the inflation part 42 of the airtightness detection assembly 40 of the present embodiment is connected to an external air source to inflate the sealing cover 41, so as to increase the air pressure in the sealing cover 41, and the gas in the sealing cover 41 will enter the battery box body 10 through the explosion-proof valve 30, so as to make the air pressure in the battery box body 10 greater than the external air pressure, facilitating the airtightness detection of the battery box. The first sealing element 31 is arranged in the gap between the explosion-proof valve 30 and the outer surface of the edge of the opening 11 to realize the sealed connection of the connection between the explosion-proof valve 30 and the battery box, and improve the airtightness between the explosion-proof valve 30 and the battery box 10. The explosion-proof valve 30 is installed in the relief space 22 of the support assembly 20 and is attached to the outer surface of the edge of the opening 11, and the sealing cover 41 of the airtightness detection assembly 40 is arranged on the support assembly 20, so that the connection between the explosion-proof valve 30 and the battery box 10 is exposed outside the sealing cover 41, and the airtightness of the connection between the explosion-proof valve 30 and the battery box 10 can also be detected during the airtightness detection of the battery box 10, avoiding the problem that the connection between the explosion-proof valve 30 and the battery box 10 cannot be detected when the battery box 10 is installed in the vehicle.Figure 6 The air tightness detection assembly 40 shown covers the connection between the explosion-proof valve 30 and the battery box 10, which can cause the connection between the explosion-proof valve 30 and the battery box 10 to be missed. In addition, the connection between the sealing cover 41 and the support assembly can also be detected, which improves the reliability of the air tightness detection of the battery box 10.

[0034] Further, the support assembly 20 includes a plurality of support portions 21, which are arranged around the outer circumferential surface of the explosion-proof valve 30 and are fixed to the battery box 10. Understandably, the plurality of support portions 21 can be better arranged around the outer circumferential surface of the explosion-proof valve 30, and when the plurality of support portions 21 are arranged around the outer circumferential surface of the explosion-proof valve 30, there will be a certain gap between each support portion 21. When the connection between the explosion-proof valve 30 and the battery box 10 leaks, the gas can be discharged through the gap to better detect the leakage, prevent the leakage from entering the sealing cover 41 to cause poor or no obvious air tightness detection effect, and allow more gas to overflow from the same place to more accurately and quickly confirm the leakage position.

[0035] Reference Figure 1 , Figure 2 As shown, the support assembly 20 includes two support portions 21, each of which is arranged in a U shape, a V shape, or a C shape. The two support portions 21 are connected and arranged to form an avoidance space 22.

[0036] Further, the outer circumferential surface of the explosion-proof valve 30 is provided with a matching flange 32, and one end of the support portion 21 close to the avoidance space 22 is arranged close to the side of the matching flange 32 close to the opening 11. The matching flange 32 of the present embodiment is provided with four matching flanges, which are arranged at the four corners of the explosion-proof valve 30. By arranging the matching flange 32 close to the one end of the support portion 21 close to the avoidance space 22, the second sealing element 43 between the explosion-proof valve 30 and the sealing cover 41 is matched, which can better fix the explosion-proof valve 30 between the support portion and the sealing cover 41, improve the air tightness between the explosion-proof valve 30, the support assembly 20, and the sealing cover 41, prevent the external gas from overflowing after entering the sealing cover 41 through the inflation portion 42, and prevent the air tightness detection of the battery box 10 from being unable to be performed.

[0037] Reference Figure 2 , Figure 3As shown, the first sealing element 31 includes a first sealing ring arranged on the side of the explosion-proof valve 30 close to the opening 11 to seal the gap between the explosion-proof valve 30 and the outer surface of the opening 11. The first sealing ring is arranged on the outer edge of the side of the explosion-proof valve 30 close to the battery box 10. In this embodiment, the first sealing ring has a tubular structure. When the explosion-proof valve 30 is pressed against the outer surface of the opening 11 of the battery box 10 by the support assembly 20 and the air-tightness detection assembly 40, the tubular first sealing ring is compressed to tightly fit the explosion-proof valve 30 to the outer surface of the opening 11, thereby improving the air-tightness between the explosion-proof valve 30 and the battery box 10. In this embodiment, the first sealing ring can be a rubber sealing ring, a silicone sealing ring, a polyurethane (PU) sealing ring, etc., to better improve the sealing between the explosion-proof valve 30 and the opening 11 of the battery box 10.

[0038] Further, the second sealing element 43 includes a second sealing ring that can better fit the outer edge of the explosion-proof valve 30 to improve the sealing between the explosion-proof valve 30, the sealing cover 41, and the support assembly 20. The second sealing ring can be a rubber sealing ring, a silicone sealing ring, a polyurethane (PU) sealing ring, etc.

[0039] Further, the explosion-proof valve 30 is provided with a breathable membrane for air pressure balance adjustment between the inside of the battery box 10 and the inside of the sealing cover 41. Specifically, when external air enters the inside of the sealing cover 41 through the inflation part 42, the air pressure inside the sealing cover 41 increases and is greater than the air pressure inside the battery box 10. The breathable membrane of the explosion-proof valve 30 has a certain air permeability, so the gas inside the sealing cover 41 enters the inside of the battery box 10 through the breathable membrane, achieving balance of the internal air pressure of the sealing cover 41 and the battery box 10. After a certain amount of gas enters the inside of the battery box 10, the internal air pressure of the battery box 10 is greater than the external air pressure, facilitating air-tightness detection of the battery box 10.

[0040] Further, the battery box air-tightness detection device further includes a connecting assembly 50 that is sequentially connected to the sealing cover 41, the support assembly 20, and the battery box 10. The connecting assembly 50 includes at least one of a bolt, a screw, or a stud. Figure 1 、 Figure 2 As shown, the connecting assembly 50 is provided with multiple connecting assemblies 50 that can better fix the sealing cover 41 and the support assembly 20 to the battery box 10. The multiple connecting assemblies 50 can be one or more of a bolt, a screw, or a stud, or other components not specifically mentioned in this embodiment that can replace the bolt, the screw, or the stud for connection.

[0041] Further, the inflation part 42 comprises an inflation valve, which is configured as a one-way inflation valve for inflating the inside of the sealing cover 41. The one-way inflation valve can allow external gas to enter the inside of the sealing cover 41, but not allow the gas inside the sealing cover 41 to overflow through the one-way inflation valve. The one-way inflation valve of the present embodiment is connected to a predetermined inflation device outside, such as a high-pressure air gun, an inflation pump, a gas cylinder, and the like.

[0042] Reference Figure 6 As shown in the structural schematic diagram of the prior art air tightness detection device without installing the external air tightness tool, the explosion-proof valve 30 is directly and sealingly connected to the battery box body 10, and then the connection part of the explosion-proof valve 30 and the battery box body 10 is completely covered in the air tightness tool, so that when the air tightness of the battery box body 10 is detected, the connection part of the explosion-proof valve 30 and the battery box body 10 will be missed, resulting in incomplete air tightness detection. By exposing the connection part of the explosion-proof valve 30 and the battery box body 10 to the outside, the missing detection can be avoided, and the detection accuracy is improved.

[0043] For the convenience of description, spatial relative terms such as "above", "upper", "top", "upper", etc. can be used to describe the spatial positional relationship of one device or feature with other devices or features as shown in the drawings. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation of the device described in the drawings. For example, if the device in the drawing is inverted, the device described as "above" or "above" other devices or structures will be positioned "below" or "below" other devices or structures. Thus, the example term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative description used herein is interpreted accordingly.

[0044] In addition, it should be noted that the use of the words "first", "second", etc. to define parts is only for the convenience of distinguishing the corresponding parts, and the above words have no special meaning unless otherwise stated, and therefore cannot be understood as limiting the protection scope of the utility model.

[0045] The above is only the preferred embodiment of the utility model, and is not used to limit the utility model. For those skilled in the art, the utility model can have various changes and variations. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the utility model should be included in the protection scope of the utility model.

Claims

1. A battery case air tightness detection device characterized by comprising: The device comprises: a battery box (10), a surface of the battery box (10) is provided with an opening (11); a support assembly (20) provided on the battery box (10), the support assembly (20) is provided with a avoiding space (22) corresponding to the opening (11); an explosion-proof valve (30) installed in the avoiding space (22) of the support assembly (20) and matched with the outer surface of the edge of the opening (11), and a first sealing element (31) is arranged in the gap between the explosion-proof valve (30) and the outer surface of the edge of the opening (11); an air tightness detection assembly (40) comprising a sealing cover (41) and an inflation part (42), the sealing cover (41) is arranged on the support assembly (20), and a second sealing element (43) is arranged in the gap between the sealing cover (41) and the explosion-proof valve (30), and the inflation part (42) is used to inflate the sealing cover (41).

2. The battery case air tightness detection device according to claim 1, characterized by, The support assembly (20) comprises a plurality of support parts (21), and the plurality of support parts (21) are arranged around the outer circumferential surface of the explosion-proof valve (30) and fixed on the battery box (10).

3. The battery case air tightness testing device according to claim 2, characterized by, The support assembly (20) comprises two support parts (21), each of which is arranged in a U shape, a V shape or a C shape, and the two support parts (21) are connected and arranged to form the avoiding space (22).

4. The battery case air tightness detection device according to claim 2, characterized by, The outer circumferential surface of the explosion-proof valve (30) is provided with a matching flange (32), and one end of the support part (21) close to the avoiding space (22) is arranged on the side of the matching flange (32) close to the opening (11).

5. The battery case air tightness testing device according to claim 1, wherein The first sealing element (31) comprises a first sealing ring arranged on the side of the explosion-proof valve (30) close to the opening (11) to seal the gap between the explosion-proof valve (30) and the outer surface of the edge of the opening (11).

6. The battery case air tightness testing device according to claim 1, wherein The second sealing element (43) comprises a second sealing ring.

7. The battery case air tightness testing device according to claim 1, characterized by, The explosion-proof valve (30) is provided with a breathable film for pressure balance adjustment between the battery box (10) and the sealing cover (41).

8. The battery case air tightness testing device according to claim 1, characterized by, The device further comprises a connecting assembly (50) which is sequentially connected with the sealing cover (41), the support assembly (20) and the battery box (10).

9. The battery case air tightness testing device according to claim 8, wherein The connecting assembly (50) comprises at least one of a bolt, a screw or a stud.

10. The battery case air tightness testing device according to any one of claims 1 to 9, characterized by, The inflation part (42) comprises an inflation valve, which is a one-way inflation valve configured to inflate the sealing cover (41).

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