Flexible sealing strip for airtightness detection of new energy battery tray and detection mechanism thereof

Abstract

The invention relates to the technical field of airtight detection of new energy battery trays, and discloses a flexible sealing strip for airtight detection of new energy battery trays, which comprises a sealing strip body, a closed cavity structure is arranged in the sealing strip body, the closed cavity structure is filled with liquid, and the liquid and the sealing strip body have no chemical reaction. The invention further discloses a detection mechanism for airtightness detection of the new energy battery tray and a detection method of the detection mechanism. According to the flexible sealing strip for airtightness detection of the new energy battery tray and the detection mechanism of the flexible sealing strip, the pressure of each area is balanced in the using process of the sealing strip, local damage caused by high pressure is avoided, and local low-pressure air leakage is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of air tightness detection of new energy battery trays, and in particular to a flexible sealing strip and a detection mechanism thereof for air tightness detection of new energy battery trays. Background Art

[0002] In the airtightness testing of new energy vehicle battery trays, the reliability of the sealing structure directly determines the accuracy of the test results. The current mainstream technology is to embed a full circle of solid sealing strips on the test fixture as a sealing strip. The shape, height, and compression ratio of the sealing strips are designed according to the physical characteristics of the product and the fixture. By placing the test part on the fixture, with the sealing strip between the part and the fixture, the sealing strip is caused to shrink and deform by external pressure (such as a cylinder device) to achieve a theoretically sealed environment for airtightness testing. However, this solution has significant drawbacks: High sensitivity to flatness: Battery trays are generally large (typical specifications are 1800×1400mm), making it difficult to ensure that the flatness of the battery tray and the sealing strip is within 2mm. When the flatness of the battery tray and the sealing strip exceeds 2mm, the battery tray itself will deform, forming high-pressure and low-pressure areas at the joint. During the measurement process, air leakage may occur from the low-pressure area, resulting in test failure. Excessive compression in the high-pressure area will accelerate the aging and cracking of the sealing strip. Poor adaptability: The battery tray has a complex structure, and more than 200 welds need to be welded during the processing process, which can easily lead to welding deformation, and the sealing strip is difficult to adapt to different battery trays; Poor tolerance: If the flatness of the battery tray itself is out of tolerance, the gap between the traditional sealing strip and the battery tray will be uneven after pressing, resulting in measurement leakage. Summary of the Invention

[0003] The purpose of the present invention is to address the deficiencies of the above-mentioned technology and provide a flexible sealing strip and its detection mechanism for airtight detection of new energy battery trays, so that the pressure in each area of ​​the sealing strip is balanced during use, avoiding local damage due to high pressure and avoiding local low-pressure leakage.

[0004] To achieve the above-mentioned purpose, the flexible sealing strip for airtightness detection of new energy battery trays involved in the present invention includes a sealing strip body, the interior of the sealing strip body has a closed cavity structure, the closed cavity structure is filled with liquid, and the liquid has no chemical reaction with the sealing strip body.

[0005] Preferably, the cross-section of the sealing strip body is an ellipse or a rounded rectangle, which can disperse the torsional stress more evenly than a perfect circle or other polygons, and the major axis and minor axis design of the elliptical cross-section can fit the irregular plane of the battery tray. The major axis adapts to the large gap area and the minor axis fits the small gap area, thereby realizing adaptive distribution of sealing pressure, avoiding local overpressure, and reducing the risk of air leakage in low-pressure areas. At the same time, the rounded corners avoid sharp edges to prevent the sealing strip from cracking due to repeated compression.

[0006] Preferably, the sealing strip body is made of high-strength silicone rubber with a Shore A hardness of 40-60 to avoid rupture under high pressure.

[0007] Preferably, the liquid is silicone oil or ethylene glycol aqueous solution, which does not chemically react with the sealing strip body.

[0008] Preferably, the wall thickness of the sealing strip body is 1.5~2.5mm, which provides sufficient structural strength to resist the internal hydraulic expansion after liquid filling, and ensures that the sealing strip body can undergo 20%~30% elastic deformation under pressure, so that the liquid can flow efficiently. If the wall thickness is too large, the sealing strip will be too rigid, which will inhibit the adaptive adjustment ability. If the wall thickness is too thin, it will easily cause the sealing strip wall to collapse when the liquid flows, causing sealing failure. The volume of the liquid in the closed cavity structure accounts for 60%~70%, ensuring that the liquid has sufficient flow space.

[0009] Preferably, the viscosity range of the liquid is 50~200cP, which solves the problem of dynamic pressure distribution efficiency and ensures second-level response. The matching difference of the thermal expansion coefficient and the sealing strip body is ≤10%, which solves the sealing reliability problem under temperature alternation and avoids thermal stress damage. The two work together to make the sealing strip body have high robustness, long life and low leakage rate in the airtightness detection of new energy battery trays, making it an ideal sealing solution for welding deformation scenarios.

[0010] Preferably, the outer surface of the sealing strip body is provided with an anti-slip texture, the depth of the anti-slip texture is 0.2~0.5mm, which increases the friction coefficient, inhibits the displacement of the sealing strip body, prevents the sealing strip body from sliding laterally under pressure, and avoids local sealing failure due to displacement. In addition, the texture disperses local stress, reduces wear on the sealing strip surface, and extends the sealing life of the sealing strip body.

[0011] Preferably, a fluorescent tracer is added to the liquid at a concentration of 0.1% to 0.5%, which can quickly locate micro-leakage points and facilitate maintenance.

[0012] A detection mechanism for air tightness detection of new energy battery trays, comprising a stand, a support plate provided on the stand, a mounting groove for mounting the sealing strip body provided on the support plate, and an upper surface of the sealing strip body being higher than the surface of the support plate when the sealing strip body is installed in the mounting groove, the mounting groove matching the shape of the battery tray, and also comprising a plurality of pressing devices for pressing the battery tray downward and an air tightness detection tooling for detecting the air tightness between the battery tray and the support plate.

[0013] A detection method for a detection mechanism for air tightness detection of a new energy battery tray, comprising: installing the sealing strip body in the installation groove, placing the battery tray on the support plate with its lower surface in contact with the sealing strip body, activating the pressing device to press the battery tray downward against the sealing strip body to form a closed space between its lower surface and the sealing strip body, and finally using an airtightness detection tool to detect the air tightness of the closed space.

[0014] Compared with the prior art, the present invention has the following advantages: 1. Make the pressure of each area of ​​the sealing strip balanced during use to avoid local damage due to high pressure and local low-pressure leakage; 2. Good adaptability, can adapt to battery trays of various specifications; 3. Good tolerance, can adapt to battery trays of different qualities. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic structural diagram of a flexible sealing strip for airtightness detection of a new energy battery tray according to the present invention; Figure 2 It is a structural schematic diagram of the detection mechanism for air tightness detection of new energy battery trays according to the present invention.

[0016] The components in the figure are numbered as follows: Sealing strip body 1, closed cavity structure 2, liquid 3, stand 4, support plate 5, battery tray 6, pressing device 7. DETAILED DESCRIPTION

[0017] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0018] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0019] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0020] Example 1 like Figure 1 As shown, a flexible sealing strip for airtightness detection of new energy battery trays includes a sealing strip body 1, the sealing strip body 1 has a closed cavity structure 2 inside, the closed cavity structure 2 is filled with liquid 3, the liquid 3 has no chemical reaction with the sealing strip body 1, and the sealing strip body 1 is wear-resistant and has high toughness.

[0021] like Figure 2 As shown, a detection mechanism for air tightness detection of new energy battery trays includes a stand 4, a support plate 5 is provided on the stand 4, and a mounting groove for installing the sealing strip body 1 is provided on the support plate 5. When the sealing strip body 1 is installed in the mounting groove, its upper surface is higher than the surface of the support plate 5, and the mounting groove matches the shape of the battery tray 6. It also includes a number of pressing devices 7 for pressing the battery tray 6 downward and an air tightness detection tooling for detecting the air tightness between the battery tray 6 and the support plate 5.

[0022] During use, install the sealing strip body 1 in the installation groove, place the battery tray 6 on the support plate 5 and make its lower surface fit with the sealing strip body 1, start the pressing device 7 to make the battery tray 6 press the sealing strip body 1 downward so that a closed space is formed between its lower surface and the sealing strip body 1, and finally use the airtightness detection tooling to detect the airtightness of the closed space. During this process, after the pressing device 7 presses the battery tray 6 and the sealing strip body 1, the liquid 3 in the sealing strip body 1 will flow from the area with a small gap to the area with a large gap, thereby ensuring that the pressure in each area is balanced.

[0023] Example 2 likeFigure 1 As shown, a flexible sealing strip for airtightness detection of new energy battery trays includes a sealing strip body 1, the sealing strip body 1 has a closed cavity structure 2 inside, the closed cavity structure 2 is filled with liquid 3, the liquid 3 has no chemical reaction with the sealing strip body 1, and the sealing strip body 1 is wear-resistant and has high toughness.

[0024] Specifically, in this embodiment, the cross-section of the sealing strip body 1 is elliptical, or can be a rounded rectangle, which can disperse the torsional stress more evenly than a perfect circle or other polygons, and the major axis and minor axis design of the elliptical cross-section can fit the irregular plane of the battery tray 6. By adapting the major axis to the large gap area and the minor axis to the small gap area, the adaptive distribution of the sealing pressure is achieved to avoid local overpressure and reduce the risk of air leakage in the low-pressure area. At the same time, the rounded corners avoid sharp edges to prevent the sealing strip from cracking due to repeated compression.

[0025] In this embodiment, the sealing strip body 1 is made of high-strength silicone rubber with a Shore A hardness of 40-60 to avoid rupture under high pressure.

[0026] In this embodiment, the liquid 3 is silicone oil, or may be an ethylene glycol aqueous solution, which does not chemically react with the sealing strip body 1 .

[0027] In this embodiment, the wall thickness of the sealing strip body 1 is 1.5~2.5mm, which provides sufficient structural strength to resist the internal hydraulic expansion after the liquid 3 is filled, ensuring that the sealing strip body 1 can undergo 20%~30% elastic deformation under pressure, so that the liquid can flow efficiently. If the wall thickness is too large, the sealing strip will be too rigid and the adaptive adjustment ability will be inhibited. If the wall thickness is too thin, it will easily cause the sealing strip wall to collapse when the liquid 3 flows, causing sealing failure. The volume of the liquid 3 in the closed cavity structure 2 accounts for 60%~70%, ensuring that the liquid 3 has sufficient flow space In this embodiment, the viscosity range of the liquid 3 is 50~200cP, which solves the problem of dynamic pressure distribution efficiency and ensures a response in seconds. The matching difference of the thermal expansion coefficient and the sealing strip body 1 is ≤10%, which solves the problem of sealing reliability under temperature alternation and avoids thermal stress damage. The two work together to make the sealing strip body 1 have high robustness, long life and low leakage rate in the airtightness detection of the new energy battery tray 6, making it an ideal sealing solution for welding deformation scenarios.

[0028] In this embodiment, the outer surface of the sealing strip body 1 is provided with an anti-slip texture, the depth of the anti-slip texture is 0.2~0.5mm, which increases the friction coefficient, inhibits the displacement of the sealing strip body 1, prevents the sealing strip body 1 from sliding laterally under pressure, and avoids local sealing failure due to displacement. In addition, the texture disperses local stress, reduces wear on the sealing strip surface, and extends the sealing life of the sealing strip body 1.

[0029] Finally, a fluorescent tracer is added to liquid 3 at a concentration of 0.1% to 0.5%, which can quickly locate micro-leakage points and facilitate maintenance.

[0030] like Figure 2 As shown, a detection mechanism for air tightness detection of new energy battery trays includes a stand 4, a support plate 5 is provided on the stand 4, and a mounting groove for installing the sealing strip body 1 is provided on the support plate 5. When the sealing strip body 1 is installed in the mounting groove, its upper surface is higher than the surface of the support plate 5, and the mounting groove matches the shape of the battery tray 6. It also includes a number of pressing devices 7 for pressing the battery tray 6 downward and an air tightness detection tooling for detecting the air tightness between the battery tray 6 and the support plate 5.

[0031] During use, install the sealing strip body 1 in the installation groove, place the battery tray 6 on the support plate 5 and make its lower surface fit with the sealing strip body 1, start the pressing device 7 to make the battery tray 6 press the sealing strip body 1 downward so that a closed space is formed between its lower surface and the sealing strip body 1, and finally use the airtightness detection tooling to detect the airtightness of the closed space. During this process, after the pressing device 7 presses the battery tray 6 and the sealing strip body 1, the liquid 3 in the sealing strip body 1 will flow from the area with a small gap to the area with a large gap, thereby ensuring that the pressure in each area is balanced.

[0032] The flexible sealing strip and its detection mechanism for air tightness detection of new energy battery trays of the present invention ensure that the pressure in each area of ​​the sealing strip is balanced during use, thereby avoiding local damage due to high pressure and avoiding local low-pressure air leakage; it has good adaptability and can be adapted to battery trays 6 of various specifications; it has good tolerance and can adapt to battery trays 6 of different qualities.

[0033] It should be noted that the description of the above technical solutions is illustrative only. This specification may be embodied in various forms and should not be construed as limiting the technical solutions set forth herein. Rather, these descriptions are provided to ensure that the disclosure of the present invention is thorough and complete and to fully convey the scope of the disclosure to those skilled in the art. Furthermore, the technical solutions of the present invention are limited only by the scope of the claims.

[0034] Finally, it should be pointed out that the above content is a further detailed description of the invention in conjunction with specific implementation methods. It cannot be considered that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, simple replacements made without departing from the concept of the present invention should be considered to fall within the scope of protection of the present invention. The above embodiments are only more representative examples of the present invention. Obviously, the present invention is not limited to the above embodiments, and there can be many variations. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention should be considered to fall within the scope of protection of the present invention.

[0035] For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or replacements can be made without departing from the concept of the present invention. The above structures should be regarded as belonging to the protection scope of the present invention.

Claims

1. A flexible sealing strip for airtightness detection of a new energy battery tray, comprising a sealing strip body (1), characterized in that: The sealing strip body (1) has a closed cavity structure (2) inside, and the closed cavity structure (2) is filled with liquid (3), and the liquid (3) has no chemical reaction with the sealing strip body (1).

2. The flexible sealing strip for airtightness detection of new energy battery trays according to claim 1 is characterized in that: The cross section of the sealing strip body (1) is an ellipse or a rounded rectangle.

3. The flexible sealing strip for airtightness detection of new energy battery trays according to claim 1 is characterized in that: The sealing strip body (1) is made of high-strength silicone rubber with a Shore A hardness of 40-60.

4. The flexible sealing strip for airtightness detection of new energy battery trays according to claim 1 is characterized in that: The liquid (3) is silicone oil or ethylene glycol aqueous solution.

5. The flexible sealing strip for airtightness detection of new energy battery trays according to claim 2 is characterized in that: The wall thickness of the sealing strip body (1) is 1.5-2.5 mm, and the volume of the liquid (3) in the closed cavity structure (2) accounts for 60%-70%.

6. The flexible sealing strip for airtightness detection of new energy battery trays according to claim 1 is characterized in that: The viscosity of the liquid (3) is in the range of 50 to 200 cP, and the thermal expansion coefficient is less than or equal to 10% of the matching value of the sealing strip body (1).

7. The flexible sealing strip for airtightness detection of new energy battery trays according to claim 1 is characterized in that: The outer surface of the sealing strip body (1) is provided with an anti-slip texture, and the depth of the anti-slip texture is 0.2-0.5 mm.

8. The flexible sealing strip for airtightness detection of new energy battery trays according to claim 1 is characterized in that: A fluorescent tracer is added to the liquid (3) at a concentration of 0.1% to 0.5%.

9. A detection mechanism for airtightness detection of a new energy battery tray according to any one of claims 1 to 8, characterized in that: The invention comprises a stand (4), wherein a support plate (5) is provided on the stand (4), wherein a mounting groove for mounting the sealing strip body (1) is provided on the support plate (5), and when the sealing strip body (1) is mounted in the mounting groove, the upper surface thereof is higher than the surface of the support plate (5), and the mounting groove matches the shape of the battery tray (6). The invention also comprises a plurality of pressing devices (7) for pressing the battery tray (6) downward and an airtightness detection tool for detecting the airtightness between the battery tray (6) and the support plate (5).

10. A detection method for a detection mechanism for airtightness detection of a new energy battery tray according to claim 9, characterized in that: The sealing strip body (1) is installed in the installation groove, the battery tray (6) is placed on the support plate (5) and its lower surface is in contact with the sealing strip body (1), the pressing device (7) is activated to press the battery tray (6) downward against the sealing strip body (1) to form a closed space between its lower surface and the sealing strip body (1), and finally the airtightness of the closed space is tested using an airtightness testing tool.

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