Air tightness test tool

Abstract

The embodiment of the utility model discloses an air tightness test tool. The air tightness test tool comprises a tool upper cover and a tool base, one side, close to the test piece sample, of the tool upper cover is provided with at least one first cavity; an opening of the first cavity is close to the test piece sample; one side, close to the test piece sample, of the tool base is provided with at least one second cavity, and an opening of the second cavity is close to the test piece sample; the test piece sample is provided with at least one first through hole penetrating through the test piece sample, a first fastener for sealing and fixing the test piece sample is arranged in the first through hole, one end of the first fastener is close to the first cavity, and the other end of the first fastener is close to the second cavity; the air tightness test tool is configured to test the air tightness of the first through hole, so that the reliable air tightness test can be carried out on the sealed and fixed part of the battery, and the purpose of accurately testing the air tightness of the battery is achieved.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to an airtightness testing fixture. Background Technology

[0002] The sealing performance of a battery pack is crucial for its safety and performance, playing a key role in the safe operation and protection of the battery modules. Poor sealing can lead to performance degradation and frequent malfunctions. Therefore, sealing testing is a critical step in ensuring the safety and lifespan of the battery pack. Utility Model Content

[0003] To address the shortcomings of existing technologies, this application provides an airtightness testing fixture that can perform reliability airtightness testing on the sealed fixing points of a battery, thereby accurately testing the battery's sealing performance.

[0004] To address the above problems, this application provides an airtightness testing fixture, which includes:

[0005] The tooling cover has at least one first cavity on the side near the test specimen; the opening of the first cavity is close to the test specimen.

[0006] The tooling base has at least one second cavity on the side of the tooling base near the test specimen sample, and the opening of the second cavity is close to the test specimen sample;

[0007] The test specimen sample is provided with at least one first through hole penetrating the test specimen sample. A first fastener is provided in the first through hole to seal and fix the test specimen sample. One end of the first fastener is close to the first cavity, and the other end of the first fastener is close to the second cavity.

[0008] The airtightness testing fixture is configured to test the airtightness at the first through hole.

[0009] Furthermore, in the airtightness testing fixture provided in this application, the test sample is placed between the fixture cover and the fixture base.

[0010] Furthermore, in the airtightness testing fixture provided in this application, the test sample includes a lid simulation component and a box body simulation component;

[0011] The lid simulation component and the body simulation component are fixedly connected by a first fastener.

[0012] Furthermore, in the airtightness testing fixture provided in this application, the test sample also includes a sealing element;

[0013] The sealing element is located between the box cover simulation element and the box body simulation element, and the first through hole passes through the box cover simulation element, the sealing element and the box body simulation element in sequence.

[0014] Furthermore, in the airtightness testing fixture provided in this application, the first fastener includes a bolt and a rivet nut;

[0015] Among them, bolts and rivet nuts are used to seal and fix the box cover simulation part and the box body simulation part at the first through hole.

[0016] Furthermore, in the airtightness testing fixture provided in this application, sealant is filled between the first fastener and the inner wall of the first through hole.

[0017] Furthermore, in the airtightness testing fixture provided in this application, the lid simulation component is configured as the first contact part simulating the lid, and the body simulation component is configured as the second contact part simulating the body; the first contact part and the second contact part are fixedly connected to achieve a fixed connection between the lid and the body.

[0018] Furthermore, in the airtightness testing fixture provided in this application, the fixture cover is provided with multiple first cavities, and the first cavities are not interconnected; or / and,

[0019] The tooling base has multiple second cavities, and the second cavities are not connected to each other.

[0020] Furthermore, in the airtightness testing fixture provided in this application, a first airtightness adapter is provided on the side of the fixture cover away from the first cavity, and the first airtightness adapter is in communication with the first cavity; or / and,

[0021] A second airtight adapter is provided on the side of the tooling base away from the second cavity, and the second airtight adapter is connected to the first cavity; or / and,

[0022] The tooling cover has a first groove on the side near the test sample, and a second seal is placed in the first groove and arranged around the first cavity; or / and,

[0023] The tooling base has a second groove on the side near the test sample, the second groove holds a second seal and surrounds the second cavity; or / and,

[0024] Furthermore, in the airtightness testing fixture provided in this application, a handle is provided on the side of the fixture cover away from the test specimen, and the handle is fixedly connected to the fixture cover; or / and,

[0025] The tool cover and the tool base are fixedly connected by a second fastener.

[0026] The airtightness testing fixture provided in this application includes a fixture cover and a fixture base. The fixture cover has at least one first cavity on the side near the test sample, with the opening of the first cavity close to the test sample. The fixture base has at least one second cavity on the side near the test sample, with the opening of the second cavity close to the test sample. The test sample has at least one through-hole penetrating the test sample, and a first fastener for sealing and fixing the test sample is provided within the first through-hole. One end of the first fastener is close to the first cavity, and the other end of the first fastener is close to the second cavity. The airtightness testing fixture is configured to test the airtightness at the first through-hole, thereby enabling reliable airtightness testing of the sealed fixing point of the battery, achieving the purpose of accurately testing the battery's sealing performance. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a first structural schematic diagram of the airtightness testing fixture provided in an embodiment of this application;

[0029] Figure 2 This is a schematic diagram of the second structure of the airtightness testing fixture provided in the embodiments of this application;

[0030] Figure 3 A schematic diagram of the third structure of the airtightness testing fixture provided in the embodiments of this application;

[0031] Figure 4 A schematic diagram of the fourth structure of the airtightness testing fixture provided in the embodiments of this application;

[0032] Figure 5 A schematic diagram of the fifth structure of the airtightness testing fixture provided in the embodiments of this application;

[0033] Figure 6 This is a first structural schematic diagram of the test specimen sample provided in the embodiments of this application;

[0034] Figure 7 This is a second structural schematic diagram of the test specimen provided in the embodiments of this application;

[0035] Figure 8 This is a schematic diagram of the structure of the box cover simulation component provided in the embodiments of this application;

[0036] Figure 9 This is a structural schematic diagram of the box-shaped simulation component provided in the embodiments of this application;

[0037] Figure 10 This is a schematic diagram of the structure of the sealing element provided in the embodiments of this application;

[0038] Figure 11 This is a schematic diagram of the first structure of the tooling cover provided in an embodiment of this application;

[0039] Figure 12 This is a schematic diagram of the second structure of the tooling cover provided in an embodiment of this application;

[0040] Figure 13 This is a first structural schematic diagram of the tooling base provided in an embodiment of this application;

[0041] Figure 14 This is a schematic diagram of the second structure of the tooling base provided in the embodiments of this application.

[0042] Figure label:

[0043] 10 is the tooling cover, 101 is the first cavity, 102 is the first airtight adapter, 103 is the first groove, 104 is the second through hole, 105 is the handle, 20 is the test sample, 201 is the first through hole, 202 is the first fastener, 2021 is the bolt, 2022 is the rivet nut, 203 is the box cover simulation part, 204 is the box body simulation part, 205 is the seal, 30 is the tooling base, 301 is the second cavity, 302 is the second airtight adapter, 303 is the second groove, and 304 is the third through hole. Detailed Implementation

[0044] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0045] It should be understood that, when used in this specification and the appended claims, the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0046] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of the application. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0047] It should also be further understood that the term “and / or” as used in this application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0048] Furthermore, in this application, unless otherwise explicitly specified or limited in the embodiments, the terms "installation," "connection," "joining," and "fixing" appearing in the embodiments should be interpreted broadly. For example, a connection can be a fixed connection, a detachable connection, or an integral part; it can also be a mechanical connection, an electrical connection, etc. Of course, it can also be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication between two components, or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific implementation.

[0049] In related technologies, the battery pack casing and cover are sealed and fixed together using silicone, sealing cotton, bolts, and rivet nuts. The sealing cotton is placed between the casing and the cover, and the rivet nuts are fixedly connected to the bolts to fix the casing and cover together. The silicone fills the gaps between the bolts and the cover, as well as the gaps between the rivet nuts and the casing, thereby fixing the casing and cover together.

[0050] To verify the reliability of the seal between the battery pack casing and the cover, an airtightness test is usually required. However, airtightness testing of battery packs is time-consuming, involves large material sizes, and requires significant manpower, equipment, and space, making it unsuitable for quickly verifying whether components meet requirements. Therefore, it is necessary to design small modules to verify the reliability of the battery pack's seal.

[0051] In one embodiment, such as Figure 1 As shown, in order to test the airtightness of the box body and the box cover after being sealed and fixed with silicone, sealing cotton, bolts and rivet nuts, the bolts and rivet nuts are usually riveted to the sheet metal and placed in a cavity with an opening. At the same time, silicone is filled in the gaps between the bolts and the sheet metal, and between the rivet nuts and the sheet metal to form a test sample. Then, air is filled into the cavity using airtightness testing equipment to test the airtightness.

[0052] However, the above method, due to the use of silicone to fill the gaps between the bolts and sheet metal, and between the rivet nuts and sheet metal, makes it impossible to determine whether the leak in the test sample is caused by the seal formed by the bolts and rivet nuts, or by the seal of the silicone. Furthermore, since there are multiple sets of bolts and rivet nuts, all located within cavities, once it is determined that the leak is caused by the seal between the bolts and rivet nuts, it is necessary to spray soapy water or inject water, and observe whether air bubbles are generated to identify the specific bolt and rivet nut. This method is not only inefficient and unsuitable for large-scale testing, but also has poor accuracy.

[0053] To this end, this application provides an airtightness testing fixture, which includes a fixture cover and a fixture base; the fixture cover has at least one first cavity on the side near the test sample; the opening of the first cavity is close to the test sample; the fixture base has at least one second cavity on the side near the test sample, the opening of the second cavity being close to the test sample; the test sample has at least one first through hole penetrating the test sample, and a first fastener for sealing and fixing the test sample is provided in the first through hole, one end of the first fastener being close to the first cavity, and the other end of the first fastener being close to the second cavity; the airtightness testing fixture is configured to test the airtightness at the first through hole, thereby enabling reliable airtightness testing of the sealed fixing point of the battery, achieving the purpose of accurately testing the battery's sealing performance.

[0054] like Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 10 , Figure 11 , Figure 12 , Figure 13 and Figure 14 As shown, this application provides an airtightness testing fixture, which includes:

[0055] The tooling cover 10 has at least one first cavity 101 on the side of the tooling cover 10 close to the test specimen sample 20; the opening of the first cavity 101 is close to the test specimen sample 20.

[0056] The tooling base 30 has at least one second cavity 301 on the side of the tooling base 30 close to the test specimen sample 20, and the opening of the second cavity 301 is close to the test specimen sample 20.

[0057] The test specimen sample 20 is provided with at least one first through hole 201 penetrating the test specimen sample 20. A first fastener 202 is provided in the first through hole 201 to seal and fix the test specimen sample 20. One end of the first fastener 202 is close to the first cavity 101, and the other end of the first fastener 202 is close to the second cavity 301.

[0058] The air tightness testing fixture is configured to test the air tightness at the first through hole 201.

[0059] In this embodiment, the test sample 20 can be understood as the battery pack housing, the battery pack cover, the sealing cotton between the battery pack housing and the cover, or the battery pack housing and cover, but is not limited to these.

[0060] The first fastener 202 can be understood as bolt 2021, rivet nut 2022, bolt 2021 and sealant, rivet nut 2022 and sealant, or bolt 2021, rivet nut 2022 and sealant, but it is not limited to these.

[0061] For example, when it is necessary to test the sealing performance between the first through hole 201 and the bolt 2021 at the cover of the battery pack, the test sample 20 can be a sheet metal with the bolt 2021 embedded in it, and the space between the first through hole 201 and the bolt 2021 is filled with sealant. At this time, the simulation sample can be placed between the tooling cover 10 and the tooling base 30, and air is injected into the first cavity 101. Then, the sealing performance of the sealant is determined by detecting the air pressure in the second cavity 301; or air is injected into the second cavity 301, and the sealing performance of the sealant is determined by detecting the air pressure in the first cavity 101.

[0062] For example, when it is necessary to test the sealing performance between the first through hole 201 and the rivet nut 2022 at the battery pack housing, the test sample 20 can be sheet metal with the rivet nut 2022 embedded in it, and the space between the first through hole 201 and the rivet nut 2022 is filled with sealant. At this time, the simulation part can be placed between the tooling cover 10 and the tooling base 30, and air is injected into the first cavity 101. Then, the sealing performance of the sealant is determined by detecting the air pressure in the second cavity 301; or air is injected into the second cavity 301, and the sealing performance of the sealant is determined by detecting the air pressure in the first cavity 101.

[0063] For example, when it is necessary to test the sealing performance of the battery pack casing and cover after they are fixed with bolts 2021 and rivet nuts 2022, the test sample 20 includes two sheet metal parts, one of which is inlaid with bolts 2021 and the other with rivet nuts 2022. After the two sheet metal parts are fixed with bolts 2021 and rivet nuts 2022, they can be placed between the tooling cover 10 and the tooling base 30, and air is injected into the first cavity 101. Then, the sealing performance of the sealant is determined by detecting the air pressure in the second cavity 301; or air is injected into the second cavity 301, and the sealing performance of the bolts 2021 and rivet nuts 2022 is determined by detecting the air pressure in the first cavity 101.

[0064] For example, when it is necessary to test the sealing performance of the sealing cotton between the battery pack's casing and cover, two sheet metals can be used to simulate the battery pack's casing and cover respectively. After the sealing cotton is placed between the two sheet metals, one end of the first through hole 201 is sealed, and the other end is connected to the first cavity 101 or the second cavity 301. It is placed between the tooling cover 10 and the tooling base 30. If the other end of the first through hole 201 is connected to the first cavity 101, air can be injected into the first cavity 101, and then the sealing performance of the sealant can be determined by detecting the air pressure of the second cavity 301. If the other end of the first through hole 201 is connected to the second cavity 301, air can be injected into the second cavity 301, and then the sealing performance of the sealing cotton can be determined by detecting the air pressure of the first cavity 101.

[0065] As can be seen, the airtightness testing fixture provided in this application can effectively test whether the air leakage at the battery pack seal is caused by the sealant or by bolts 2021 and rivet nuts 2022. This allows for rapid identification and verification of component performance in the early stages, with minimal requirements for personnel, equipment, materials, and space, thus saving resources. Furthermore, the airtightness testing fixture provided in this application can be inflated from different directions, allowing for simultaneous verification of the reliability of different interfaces and avoiding multiple disassembly and reassembly of the fixture.

[0066] The airtightness testing fixture provided in this application includes a fixture cover 10 and a fixture base 30. The fixture cover 10 has at least one first cavity 101 on the side near the test sample 20, with the opening of the first cavity 101 close to the test sample 20. The fixture base 30 has at least one second cavity 301 on the side near the test sample 20, with the opening of the second cavity 301 close to the test sample 20. The test sample 20 has at least one first through hole 201 penetrating the test sample 20, and a first fastener 202 for sealing and fixing the test sample 20 is provided within the first through hole 201. One end of the first fastener 202 is close to the first cavity 101, and the other end of the first fastener 202 is close to the second cavity 301. The airtightness testing fixture is configured to test the airtightness at the first through hole 201, thereby enabling reliable airtightness testing of the sealed fixing point of the battery, achieving the purpose of accurately testing the battery's sealing performance.

[0067] In some embodiments, such as Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 10 , Figure 11 , Figure 12 , Figure 13 and Figure 14 As shown, the test sample 20 is placed between the tooling cover 10 and the tooling base 30.

[0068] Specifically, the main purpose of this application is to improve the sealing performance of the battery pack's casing and cover at this time. Therefore, when using the test sample 20 to simulate the battery pack's casing and cover, this application can simulate the sealing performance of the battery pack's casing and cover. However, considering that there is also sealing cotton between the battery pack's casing and cover, the test sample 20 can be placed between the tooling cover 10 and the tooling base 30.

[0069] In some embodiments, such as Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 and Figure 9 As shown, the test sample 20 includes a lid simulation 203 and a box body simulation 204; wherein the lid simulation 203 and the box body simulation 204 are fixedly connected by a first fastener 202.

[0070] In this embodiment, both the lid simulation component 203 and the body simulation component 204 can be made of sheet metal. The first fastener 202 can close the lid simulation component 203 and the body simulation component 204 to seal and fix them.

[0071] In some embodiments, such as Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 10 As shown, the test specimen sample 20 also includes a sealing element 205; wherein, the sealing element 205 is disposed between the cover simulation element 203 and the box body simulation element 204, and the first through hole 201 passes through the cover simulation element 203, the sealing element 205 and the box body simulation element 204 in sequence.

[0072] In this embodiment, the sealing element 205 can be the sealing cotton between the battery pack box body and the box cover. After the sealing element 205 is placed between the box cover simulation 203 and the box body simulation 204, the box cover simulation 203, the sealing element 205 and the box body simulation 204 can be fixedly connected by bolts 2021 and rivet nuts 2022 through the first through hole 201.

[0073] In some embodiments, such as Figure 6 , Figure 7 , Figure 8 and Figure 9 As shown, the first fastener 202 includes a bolt 2021 and a rivet nut 2022; wherein, the bolt 2021 and the rivet nut 2022 seal and fix the cover simulation 203 and the box body simulation 204 at the first through hole 201.

[0074] In this embodiment, bolt 2021 is located at box cover simulation part 203, and rivet nut 2022 is located at box body simulation part 204. When it is necessary to test the airtightness between bolt 2021 and rivet nut 2022 (i.e., the airtightness of the first fastener 202), bolt 2021 and rivet nut 2022 can be directly fixed together to seal and fix the cover simulation 203 and the box body simulation 204. At this time, it is not necessary to fill the gap between bolt 2021 and cover simulation 203, nor is it necessary to fill the gap between rivet nut 2022 and box body simulation 204 with sealant. After sealing and fixing, cover simulation 203 and box body simulation 204 can be placed between tooling cover 10 and tooling base 30, and air can be injected into the first cavity 101. Then, the sealing performance of the sealant can be determined by detecting the air pressure of the second cavity 301; or air can be injected into the second cavity 301, and the sealing performance of bolt 2021 and rivet nut 2022 can be determined by detecting the air pressure of the first cavity 101.

[0075] In some embodiments, sealant is used to fill the space between the first fastener 202 and the inner wall of the first through hole 201.

[0076] In some embodiments, the lid simulation component 203 is configured as a first contact portion simulating a lid, and the body simulation component 204 is configured as a second contact portion simulating a body; the first contact portion and the second contact portion are fixedly connected to achieve a fixed connection between the lid and the body.

[0077] In this embodiment, both the cover simulation component 203 and the body simulation component 204 can be sheet metal. The cover simulation component 203 can be the area where the cover of the battery pack is sealed and fixedly connected to the body, i.e., the first contact part; the body simulation component 204 can be the area where the body of the battery pack is sealed and fixedly connected to the cover, i.e., the second contact part.

[0078] In some embodiments, such as Figure 11 , Figure 12 , Figure 13 and Figure 14 As shown, the tooling cover 10 is provided with multiple first cavities 101, and the first cavities 101 are not connected to each other; the tooling base 30 is provided with multiple second cavities 301, and the second cavities 301 are not connected to each other.

[0079] In this embodiment, the first fastener 202 can be understood as a set of bolts 2021 and rivet nuts 2022. The set of bolts 2021 and rivet nuts 2022 can correspond to a set of first cavities 101 and second cavities 301, thereby enabling individual testing of the sealing performance of each set of bolts 2021 and rivet nuts 2022 on the battery pack housing and cover.

[0080] Simultaneously, each set of first cavities 101 and second cavities 301 can simulate the airtightness test of each set of bolts 2021 and rivet nuts 2022 under different environments, and can also simultaneously conduct airtightness tests after aging for different time periods, thereby assessing whether the airtightness performance of fasteners remains effective after corrosion aging. This application, by simulating the overall connection state in actual applications, can realistically reflect the functional performance of fasteners under corrosion aging conditions, effectively assessing the functional failure risk of components under actual application conditions, which has important practical significance for preventing and reducing the performance degradation of fasteners caused by corrosion aging.

[0081] In some embodiments, such as Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 10 , Figure 11 , Figure 12 , Figure 13 and Figure 14 As shown, the tooling cover 10 is provided with a first airtight adapter 102 on the side away from the first cavity 101, and the first airtight adapter 102 is connected to the first cavity 101; the tooling base 30 is provided with a second airtight adapter 302 on the side away from the second cavity 301, and the second airtight adapter 302 is connected to the first cavity 101.

[0082] In this embodiment, the first airtightness adapter 102 is configured to inflate the first cavity 101, and the second airtightness adapter 302 is configured to inflate the second cavity 301. Both the first airtightness adapter 102 and the second airtightness adapter 302 can be connected to an external airtightness testing device. This allows for airtightness testing of the sealing and fixing points between the battery pack casing and the casing cover after the test sample 20 is placed between the tooling cover 10 and the tooling base 30. Each first cavity 101 can be equipped with one first airtightness adapter 102, and each second cavity 301 can be equipped with one second airtightness adapter 302.

[0083] In some embodiments, such as Figure 11 , Figure 12 , Figure 13 and Figure 14 As shown, the tooling cover 10 has a first groove 103 on the side near the test sample 20, and the first groove 103 holds the second sealing element 205 and surrounds the first cavity 101; the tooling base 30 has a second groove 303 on the side near the test sample 20, and the second groove 303 holds the second sealing element 205 and surrounds the second cavity 301.

[0084] In this embodiment, by placing a second sealing element 205 at the first groove 103 and the second groove 303, the second sealing element 205 can be a sealant, specifically a silicone sealing strip, thereby sealing the first cavity 101 and the second cavity 301 after the test sample 20 is placed between the tooling cover 10 and the tooling base 30. Simultaneously, the number of first grooves 103 can be equal to the number of first cavities 101, and the number of second grooves 303 can be equal to the number of second cavities 301. The first groove 103 and the second groove 303 can be annular in shape.

[0085] In some embodiments, such as Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, a handle 105 is provided on the side of the tooling cover 10 away from the test sample 20, and the handle 105 is fixedly connected to the tooling cover 10.

[0086] In this embodiment, two handles 105 can be provided on the tooling cover 10. The handles 105 can be located on the top of the tooling cover 10 so as to facilitate the easy separation of the tooling cover 10 from the tooling base 30.

[0087] In some embodiments, such as Figure 2 , Figure 3 , Figure 4 , Figure 12 and Figure 14 As shown, the tooling cover 10 and the tooling base 30 are fixedly connected by a second fastener (not shown in the figure).

[0088] In this embodiment, the tooling cover 10 has at least one second through hole 104 at its edge, and the tooling base 30 has at least one third through hole 304 at its edge. One second through hole 104 corresponds to one third through hole 304. A second fastener can pass through the second through hole 104 and the third through hole 304 sequentially to fix the tooling cover 10 and the tooling base 30 together. The second fastener can be the same as the first fastener.

[0089] The airtightness testing fixture provided in this application has a wide range of applicability and can be used with different types of fasteners, such as rivet nuts 2022 / press nuts, rivet nuts 2022 with sealant, rivet nuts 2022 without sealant, through-hole rivet nuts, blind-hole rivet nuts, bolts 2021 (with / without sealant), etc. Furthermore, it can achieve multi-functional testing of different assembly interfaces through two forms of air inflation: upper inflation and lower inflation, which greatly improves the efficiency and convenience of studying the sealing reliability of fastener assembly interfaces.

[0090] It should be noted that the airtightness testing fixture provided in this application can also test the sealing performance between bolts 2021 and nuts on other objects, and is not limited to the sealing performance between the battery pack casing and the casing cover.

[0091] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this application, and these modifications or substitutions should all be covered within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. An airtightness testing fixture, characterized in that, include: The tooling cover has at least one first cavity on the side near the test specimen sample; The opening of the first cavity is close to the test specimen sample; The tooling base has at least one second cavity on the side near the test specimen sample, and the opening of the second cavity is close to the test specimen sample. The test specimen sample is provided with at least one first through hole penetrating the test specimen sample. A first fastener is provided in the first through hole to seal and fix the test specimen sample. One end of the first fastener is close to the first cavity, and the other end of the first fastener is close to the second cavity. The airtightness testing fixture is configured to test the airtightness at the first through hole.

2. The airtightness testing fixture according to claim 1, characterized in that, The test specimen is placed between the tooling cover and the tooling base.

3. The airtightness testing fixture according to claim 1, characterized in that, The test specimen samples include a lid simulation and a box body simulation; The lid simulation component and the body simulation component are fixedly connected by a first fastener.

4. The airtightness testing fixture according to claim 3, characterized in that, The test specimen sample also includes a seal; The sealing element is located between the box cover simulation element and the box body simulation element, and the first through hole passes through the box cover simulation element, the sealing element and the box body simulation element in sequence.

5. The airtightness testing fixture according to claim 4, characterized in that, The first fastener includes a bolt and a rivet nut; The bolt and the rivet nut seal and fix the box cover simulation component and the box body simulation component at the first through hole.

6. The airtightness testing fixture according to claim 1, characterized in that, The space between the first fastener and the inner wall of the first through hole is filled with sealant.

7. The airtightness testing fixture according to claim 3, characterized in that, The lid simulation component is configured as the first contact part simulating the lid, and the body simulation component is configured as the second contact part simulating the body; the first contact part and the second contact part are fixedly connected to achieve a fixed connection between the lid and the body.

8. The airtightness testing fixture according to any one of claims 1-7, characterized in that, The tooling cover is provided with multiple first cavities, and the first cavities are not interconnected; or / and, The tooling base is provided with multiple second cavities, and the second cavities are not connected to each other.

9. The airtightness testing fixture according to any one of claims 1-7, characterized in that, The tooling cover is provided with a first airtight adapter on the side away from the first cavity, and the first airtight adapter is in communication with the first cavity; or / and, The tooling base is provided with a second airtight adapter on the side away from the second cavity, and the second airtight adapter is in communication with the first cavity; or / and, The tooling cover has a first groove on the side near the test specimen, and a second sealing element is placed in the first groove and arranged around the first cavity; or / and, The tooling base has a second groove on the side near the test sample, and the second groove holds a second seal and surrounds the second cavity.

10. The airtightness testing fixture according to any one of claims 1-7, characterized in that, The tooling cover has a handle on the side away from the test specimen, and the handle is fixedly connected to the tooling cover; or / and, The tooling cover and the tooling base are fixedly connected by a second fastener.

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