Battery cover plate assembly test fixture and test equipment

Abstract

The utility model discloses a battery cover plate assembly test fixture and test equipment. The battery cover plate assembly test fixture comprises a base and a pressing piece, a gas pressure port and a gas passage are respectively arranged at the positions, corresponding to the first pole, the second pole and the explosion-proof valve of the battery cover plate assembly, on the base; and the pressing piece is provided with an observation opening of which the visible area covers the first pole, the second pole and the anti-explosion valve. According to the utility model, the cover plate of the battery cover plate assembly is clamped and positioned by folding the base and the pressing piece, namely, the whole battery cover plate assembly is positioned between the base and the pressing piece; meanwhile, the gas for testing can be guided to the corresponding gas pressure application ports through the gas passages correspondingly arranged on the base and is respectively applied to the first pole, the second pole or the anti-explosion valve, so that various tests such as gas tightness test of the poles, blasting test of the anti-explosion valve, breathing test of the anti-explosion valve and the like are realized; and the compatibility and convenience of implementation of a plurality of test items are greatly improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of battery processing devices, and in particular relates to a battery cover plate component testing fixture and testing equipment. Background Art

[0002] The battery cover assembly (also called the battery top cover assembly) is an accessory that is arranged on the top of the battery shell and is used to protect the battery and cover the internal structure of the battery. Figure 1 The figure shows a common battery cover assembly 3, which includes a cover 30, a first pole 31, a second pole 32 and an explosion-proof valve 33. The first pole 31, the second pole 32 and the explosion-proof valve 33 are arranged on the cover 30 at intervals, and the explosion-proof valve 33 is generally located between the first pole 31 and the second pole 32.

[0003] Among them, the first pole 31 and the second pole 32 are conductive mechanisms with opposite polarities, and need to be assembled in an insulated manner relative to the cover plate 30. The assembled product needs to meet specific airtightness requirements. In addition, the explosion-proof valve 33 is an explosion-proof pressure relief mechanism, and the assembled product also needs to meet specific airtightness requirements and explosion test requirements, so as to meet the safety performance requirements of the battery.

[0004] In the related industry, at the end of the production process of the battery cover assembly 3, it is necessary to perform multiple air tightness tests and explosion tests on the battery cover assembly 3; for example: the first pole 31 and the second pole 32 (i.e., the positive pole and the negative pole) are tested for air leakage after a pressure test; the explosion-proof valve 33 is tested for burst value (this item is a random inspection) and the explosion-proof valve 33 is tested for air leakage from the inside to the outside and from the outside to the inside.

[0005] At present, each of the above-mentioned corresponding test items requires the manufacture of a dedicated fixture for testing, and each time a test is performed, the corresponding fixture needs to be replaced, which greatly increases the manufacturing cost and the testing cost. Utility Model Content

[0006] The utility model aims to provide a battery cover assembly test fixture and test equipment, aiming to improve the compatibility of multiple test items. The utility model is implemented by the following technical solutions:

[0007] A battery cover assembly test fixture, the battery cover assembly includes a cover and a first pole, a second pole and an explosion-proof valve spaced apart on the cover; the battery cover assembly test fixture includes: a base and a pressing piece that abut against each other and clamp the cover in place; a gas pressure port and a gas passage are respectively provided on the base at positions corresponding to the first pole, the second pole and the explosion-proof valve; an observation port with a visible area covering the first pole, the second pole and the explosion-proof valve is opened on the pressing piece.

[0008] The battery cover assembly test fixture provided by the above scheme clamps and positions the cover of the battery cover assembly by matching the base and the pressing piece, which is equivalent to positioning the entire battery cover assembly between the base and the pressing piece; at the same time, the gas used for the test can be guided to the corresponding gas pressure port through the corresponding gas passage arranged on the base and pressurized on the first pole, the second pole or the explosion-proof valve respectively. In this way, a set of fixtures can be used to realize various types of testing such as the air tightness test of the pole, the burst test of the explosion-proof valve, and the breathing test of the explosion-proof valve, which greatly improves the compatibility and convenience of implementing multiple test items.

[0009] As a preferred technical solution, the mating surfaces of the base and the pressure piece are provided with a cover plate positioning mechanism, and the cover plate positioning mechanism includes a cover plate positioning groove concavely opened on the mating surface of the base and a cover plate clamping portion provided on the mating surface of the pressure piece.

[0010] In the above preferred solution, the structure of the cover plate positioning groove and the cover plate pressing part can accurately position the cover plate of the battery cover plate assembly and press the cover plate, and can also ensure that the base and the pressing piece are aligned with each other more flatly and compactly.

[0011] As a preferred technical solution, the observation port is provided in the middle of the pressing piece so as to pass through from top to bottom, and the cover plate pressing portion is formed at the bottom of the pressing piece located at the periphery of the observation port.

[0012] In the above preferred scheme, the observation port is opened in the middle of the pressing piece, which is more conducive to the alignment with the first pole, the second pole and the explosion-proof valve area of ​​the positioned battery cover assembly. At the same time, the bottom of the outer periphery of the observation port can just press the cover of the positioned battery cover assembly into the cover positioning groove.

[0013] As a preferred technical solution, the observation port includes a straight cylindrical port located in the lower section and a gradually opening port located in the upper section.

[0014] In the above preferred embodiment, the straight-cylindrical opening structure of the lower section is more stable, and the gradually opening opening of the upper section is more convenient for observation.

[0015] As a preferred technical solution, the gas passage is an L-shaped passage, the gas inlet end of the gas passage is opened on the side wall of the base, and the gas outlet end of the gas passage serves as the gas pressure port and is opened in the cover plate positioning groove.

[0016] In the above preferred embodiment, the L-shaped gas passage allows the test gas to be connected from the side of the base, and the corresponding gas pressure port in the cover positioning groove applies pressure to the first pole, the second pole or the explosion-proof valve, which is more convenient for air tightness testing.

[0017] As a preferred technical solution, a gas pipe quick connector is provided at the gas inlet end of the gas passage.

[0018] In the above preferred embodiment, by providing a gas pipe quick connector, it is convenient to quickly connect or disconnect with the gas source (a gas supply device that supplies the gas used for the test), so as to facilitate switching for use.

[0019] As a preferred technical solution, the corners of the mating surface of the base are provided with convex pillows, and the corners of the mating surface of the pressing piece are provided with concave pillows for the convex pillows to fit into.

[0020] In the above preferred embodiment, by providing convex pillows and concave pillows that cooperate with each other, it is easier for the base and the pressing piece to align with each other, thereby avoiding lateral misalignment between the two.

[0021] As a preferred technical solution, in the positioning groove of the cover plate, respectively, there are openings around each of the gas pressure ports to make way for the protruding parts of the first pole, the second pole and the explosion-proof valve.

[0022] In the above preferred scheme, by setting corresponding make way grooves, when the battery cover assembly is tested on the reverse side, it is possible to make way for the protruding parts of the first pole, the second pole and the explosion-proof valve, so that the battery cover assembly can be positioned between the base and the pressure piece in an upright position (with the protruding part of the pole facing upward) or in an inverted position (with the protruding part of the pole facing downward), so as to achieve more abundant test items.

[0023] As a preferred technical solution, a sealing ring assembly groove is respectively opened on the periphery of each of the said giving way grooves, and a sealing ring is correspondingly assembled in each sealing ring assembly groove.

[0024] In the above preferred embodiment, by providing the sealing ring assembly groove and the sealing ring, the gas supplied from the corresponding gas pressure port can be sealed within the range of the first pole, the second pole and the corresponding position of the explosion-proof valve to avoid gas leakage on the pressure side.

[0025] As a preferred technical solution, the battery cover assembly test fixture further includes a locking mechanism for locking the base and the pressing piece that are aligned with each other.

[0026] As a preferred technical solution, the locking mechanism is a bolt that locks the base and the pressure piece; or, the locking mechanism is a snap mechanism that locks the base and the pressure piece.

[0027] In the above preferred embodiment, by providing a locking mechanism, the base and the pressing piece that are engaged with each other can be prevented from separating during the test process, thereby ensuring the accuracy of the test effect and results.

[0028] A battery cover assembly testing device comprises the battery cover assembly testing fixture described above, and also comprises a gas supply device for supplying the gas used for testing to the gas passage.

[0029] The battery cover assembly test equipment provided by the above technical solution provides the test gas to the battery cover assembly test clamp through the gas supply device, and water can be added to the observation port at the same time, or the test fixture equipped with the battery cover assembly can be placed in a water tank to observe whether bubbles appear in the water at the observation port and the amount of bubbles, so as to realize various tests such as the air tightness test of the pole, the explosion test of the explosion-proof valve, and the breathing test of the explosion-proof valve.

[0030] As a preferred technical solution, the battery cover assembly testing equipment also includes a water tank for immersing the battery cover assembly testing fixture.

[0031] In the above preferred embodiment, the water tank is intended to immerse the battery cover assembly test fixture, which is easier to operate and conduct batch testing than adding water at the observation port.

[0032] As a preferred technical solution, the battery cover assembly testing equipment also includes a gas sensing mechanism arranged at the observation port.

[0033] In the above preferred scheme, the provided gas sensing mechanism can replace the considered bubble observation method, for example, a non-air-permeable film is provided at the top opening of the observation port, and the deformation of the film is detected to judge the air tightness of the first pole, the second pole and the explosion-proof valve of the tested battery cover assembly; or, the introduced test gas is a special gas, and the air tightness can also be judged by using a corresponding special gas detector at the observation port end to detect whether such special gas exists and the amount of leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a three-dimensional diagram of an existing battery cover assembly.

[0035] Figure 2 for Figure 1 The longitudinal cross-sectional view of the battery cover assembly when placed upright is shown.

[0036] Figure 3 for Figure 1 A longitudinal cross-sectional view of the battery cover assembly when it is inverted is shown.

[0037] Figure 4 A three-dimensional diagram of the pressed part and the base of the battery cover assembly test fixture provided by the embodiment of the utility model after being aligned.

[0038] Figure 5 An exploded view of a battery cover assembly test fixture provided in an embodiment of the utility model.

[0039] Figure 6 A longitudinal cross-sectional view of a battery cover assembly test fixture provided in an embodiment of the utility model when performing a front test on a battery cover assembly.

[0040] Figure 7 A longitudinal cross-sectional view of a battery cover assembly test fixture provided in an embodiment of the utility model when performing a reverse side test on a battery cover assembly.

[0041] Description of the accompanying drawings: 100-battery cover assembly test fixture, 3-battery cover assembly, 30-cover, 31-first pole, 32-second pole, 33-explosion-proof valve, 1-base, 2-pressing piece, 11-matching surface, 12-cover positioning groove, 21-matching surface, 22-cover pressing part, 121-first gas pressure port, 122-second gas pressure port, 123-third gas pressure port, 124-first gas passage, 125-second gas passage, 126-third gas passage, observation port 23, 2 31-straight mouth, 232-gradient open mouth, 115 convex pillow, 215-concave pillow, 131-first make way groove, 132-second make way groove, 133-third make way groove, 141-first sealing ring assembly groove, 142-second sealing ring assembly groove, 143-third sealing ring assembly groove, 151-first sealing ring, 152-second sealing ring, 153-third sealing ring, 161-first trachea quick connector, 162-second trachea quick connector, 163-third trachea quick connector, 29-bolt, 19-screw hole. DETAILED DESCRIPTION

[0042] The following is an explanation and description of the technical scheme of the embodiment of the utility model in conjunction with the drawings of the embodiment of the utility model, but the following embodiment is only a preferred embodiment of the utility model, not all. Based on the embodiment in the implementation mode, other embodiments obtained by those skilled in the art without creative work are all within the protection scope of the utility model.

[0043] In the description of the present utility model, it needs to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships that are based on the orientations or relative positional relationships shown in the accompanying drawings, and are intended to facilitate a clear description of the structure of a product or device, and are not used to limit the actual orientation of the product or device during production, use, sales, and the like.

[0044] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "plurality" means two or more, unless otherwise clearly defined.

[0045] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "set", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0046] 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.

[0047] The present embodiment provides a battery cover assembly test fixture 100, which is used to position the battery cover assembly 3 to be tested and provide the necessary matching structure required for testing the battery cover assembly 3.

[0048] Combination Figure 1 As shown, the tested battery cover assembly 3 includes a cover 30, a first pole 31, a second pole 32 and an explosion-proof valve 33, wherein the first pole 31, the second pole 32 and the explosion-proof valve 33 are arranged on the cover 30 at intervals, and the explosion-proof valve 33 is generally located between the first pole 31 and the second pole 32. The battery cover assembly test fixture 100 provided in this embodiment can position the battery cover assembly 3 in both upright and inverted states, wherein: Figure 2 for Figure 1 The longitudinal section view of the battery cover assembly when placed upright is shown. Figure 3 for Figure 1 A longitudinal cross-sectional view of the battery cover assembly when it is inverted is shown.

[0049] Combination Figures 4 to 6As shown, the battery cover assembly test fixture 100 includes a base 1 and a pressing piece 2, the base 1 and the pressing piece 2 are arranged separately or in contact with each other, and the contact surfaces of the base 1 and the pressing piece 2 are provided with a cover positioning mechanism for clamping and positioning the cover 30 between the base 1 and the pressing piece 2. Specifically, the cover positioning mechanism includes a cover positioning groove 12 concavely opened on the contact surface 11 of the base 1 and a cover pressing portion 22 provided on the contact surface 21 of the pressing piece 2. When the battery cover assembly 3 is placed in the cover positioning groove 12, and the base 1 and the pressing piece 2 are in contact with each other, the cover pressing portion 22 presses the cover 30 in the cover positioning groove 12.

[0050] In the cover positioning groove 12 of the base 1, corresponding to the positions of the first pole 31, the second pole 32 and the explosion-proof valve 33 of the battery cover assembly 3, a first gas pressure port 121, a second gas pressure port 122 and a third gas pressure port 123 are respectively opened; at the same time, the base 1 is provided with a first gas pressure port 121, a second gas pressure port 122 and a third gas pressure port 123 corresponding to the first gas pressure port 121, the second gas pressure port 122 and the third gas pressure port 123.

[0051] Among them, the first gas passage 124, the second gas passage 125 and the third gas passage 126 are respectively used to guide the gas used for the test to the first gas pressure port 121, the second gas pressure port 122 and the third gas pressure port 123; the first gas pressure port 121, the second gas pressure port 122 and the third gas pressure port 123 are respectively used to apply the introduced gas to the first pole 31, the second pole 32 and the explosion-proof valve 33 to perform an airtightness test. In this embodiment, the first gas passage 124, the second gas passage 125 and the third gas passage 126 are all L-shaped passages, and the first gas passage 124, the second gas passage 125 and the third gas passage 126 are respectively provided with a first gas pipe quick connector 161, a second gas pipe quick connector 162 and a third gas pipe quick connector 163 at the gas inlet end.

[0052] An observation port 23 is provided in the middle of the pressing piece 2, and the visible area of ​​the observation port 23 covers the area corresponding to the first pole 31, the second pole 32 and the explosion-proof valve 33 when the battery cover assembly 3 is located in the cover positioning groove 12. In this embodiment, the observation port 23 includes a straight tube port 231 located in the lower section and a gradually opening port 232 located in the upper section. The above-mentioned pressing portion 22 is formed at the bottom of the pressing piece 2 located at the outer periphery of the straight tube port 231. If water is added into the observation port 23, or the test fixture equipped with the battery cover assembly 3 is placed in a water tank; at the same time, the first gas passage 124, the second gas pressure port 125 or the third gas pressure port 126 is used to apply the introduced high-pressure gas to the first pole 31, the second pole 32 and the explosion-proof valve 33 through the first gas pressure port 121, the second gas pressure port 122 or the third gas pressure port 123 respectively; at this time, observe whether bubbles appear in the water at the observation port 23 and the amount of bubbles to achieve the airtightness test.

[0053] The corners of the mating surface 11 of the base 1 are provided with convex pillows 115, and the corners of the mating surface 21 of the pressing piece 2 are provided with concave pillows 215 that match the convex pillows 115; when the base 1 and the pressing piece 2 are mated with each other, and the cover plate pressing part 22 presses the cover plate 30 into the cover plate positioning groove 12, the convex pillow 115 is embedded in the corresponding concave pillow 215, and a certain gap, for example, 0.2mm, is reserved between the two. Here, if there is zero gap, that is, zero fit, then the concave pillow 215 and the convex pillow 115 have a total of 8 side walls with zero fit after the mold is closed (two side walls fit for each pair of pillows), and precise positioning and a certain force need to be applied to knock in order to align them in place. If the applied force is unbalanced, it is easy to cause clamping and misalignment. In this embodiment, a gap of 0.2 mm is left between the concave pillow 215 and the convex pillow 115, so that the eight matching side walls have appropriate space for movement, and the pressing piece 2 and the base 1 can be easily aligned into place, saving manpower and time, and also avoiding jamming.

[0054] See also Figure 5 As shown, the first make way groove 131, the second make way groove 132 and the third make way groove 133 are respectively opened around the first gas pressure port 121, the second gas pressure port 122 and the third gas pressure port 123 in the cover positioning groove 12 of the base 1; in other words, the first make way groove 131, the second make way groove 132 and the third make way groove 133 are respectively opened in the cover positioning groove 12 of the base 1 corresponding to the positions of the first pole 31, the second pole 32 and the explosion-proof valve 33 of the battery cover assembly 3, and the first gas pressure port 121, the second gas pressure port 122 and the third gas pressure port 123 are respectively arranged in the first make way groove 131, the second make way groove 132 and the third make way groove 133.

[0055] In addition, in the cover plate positioning groove 12 of the base 1, a first sealing ring assembly groove 141, a second sealing ring assembly groove 142 and a third sealing ring assembly groove 143 are respectively opened on the periphery of the first make way groove 131, the second make way groove 132 and the third make way groove 133, and the first sealing ring 151, the second sealing ring 152 and the third sealing ring 153 are respectively assembled in the first sealing ring assembly groove 141, the second sealing ring assembly groove 142 and the third sealing ring assembly groove 143.

[0056] The first sealing ring 151, the second sealing ring 152 and the third sealing ring 153 are used to seal the gas supplied from the first gas pressure port 121, the second gas pressure port 122 and the third gas pressure port 123 within the range of the first pole 31, the second pole 32 and the explosion-proof valve 33, respectively. Figure 6 As shown; the first make way groove 131, the second make way groove 132 and the third make way groove 133 are used for making way for the first pole 31, the second pole 32 and the protruding part of the explosion-proof valve 33 when the battery cover assembly 3 is tested on the reverse side, see Figure 7 The depth of each of the first clearance groove 131 , the second clearance groove 132 and the third clearance groove 133 is based on the protruding height of the protruding part of the first pole 31 , the second pole 32 and the explosion-proof valve 33 plus 0.5 mm.

[0057] Combination Figure 5 and Figure 6 As shown, after the base 1 and the pressing piece 2 are aligned with each other and the cover plate 30 is positioned, the base 1 and the pressing piece 2 that are aligned with each other are locked by a locking mechanism to prevent loosening during the test. In this embodiment, the locking mechanism is four bolts 29, which are longitudinally inserted from the four corners of the observation port 23 of the pressing piece 2 and locked with the corresponding screw holes 19 on the base 1, which can not only play a locking role, but also help to achieve a balance of locking force. In some other embodiments, the locking mechanism can be a buckle mechanism.

[0058] The present embodiment also provides a test device using the above-mentioned battery cover assembly test fixture, including the battery cover assembly test fixture 100 described above, and also including: a gas supply device for supplying the test gas to the first gas passage 124, the second gas passage 125 and the third gas passage 126, and a water tank for immersing the battery cover assembly test fixture 100.

[0059] Specifically, the gas supply device is connected to the first gas pipe quick connector 161, the second gas pipe quick connector 162 and the third gas pipe quick connector 163 through the gas pipe, so as to provide the test gas to the first gas passage 124, the second gas passage 125 and the third gas passage 126. Moreover, the gas pressure of the test gas supplied by the gas supply device is adjustable, for example, the pressure can be gradually increased.

[0060] In addition, the water tank is intended to immerse the battery cover assembly test fixture 100, and the air tightness of the first pole 31, the second pole 32 and the explosion-proof valve 33 of the tested battery cover assembly 3 can be judged by observing the amount of bubbles at the observation port 23 of the battery cover assembly test fixture 100.

[0061] As an alternative embodiment, a water tank may be omitted and liquid may be directly injected into the observation port 23 of the battery cover assembly test fixture 100. The air tightness of the first pole 31, the second pole 32 and the explosion-proof valve 33 of the tested battery cover assembly 3 may be judged by observing the amount of bubbles at the observation port 23 of the battery cover assembly test fixture 100.

[0062] As another alternative embodiment, there is no need to use a water tank or inject liquid into the observation port 23. Instead, a gas sensing mechanism is provided at the observation port 23. For example, a non-air-permeable film is provided at the top opening of the observation port 23, and the air tightness of the first pole 31, the second pole 32 and the explosion-proof valve 33 of the tested battery cover assembly 3 is determined by detecting the deformation of the film. Alternatively, the test gas introduced is a special gas, and the air tightness can be determined by using a corresponding special gas detector at the end of the observation port 23 to detect the presence of such special gas and the amount of leakage.

[0063] The following describes how to use the battery cover assembly test fixture 100 under different test items:

[0064] 1. Pole air tightness test.

[0065] Place the battery cover assembly 3 to be tested upright (with the protruding part of the pole facing upward, see Figure 2 and Figure 6 ) in the cover positioning groove 12, and align the pressing piece 2 on the base 1, so that the battery cover assembly 3 is clamped and positioned between the base 1 and the pressing piece 2; introduce compressed gas from the first gas passage 124 and the second gas passage 125. This test item requires 1.2MPa compressed gas; then place the entire fixture in a water tank filled with clean water and the water covers the fixture. While continuously introducing compressed gas for 30 seconds, observe the surface of the first pole 31 and the second pole 32 through the observation port 23. If bubbles emerge, it means leakage and the airtightness is unqualified. Otherwise, it is qualified.

[0066] 2. Explosion-proof valve burst test.

[0067] Place the battery cover assembly 3 to be tested upright (with the protruding part of the pole facing upward, see Figure 2 and Figure 6) In the cover positioning groove 12, the pressing piece 2 is matched with the base 1, so that the battery cover assembly 3 is clamped and positioned between the base 1 and the pressing piece 2; compressed air is introduced from the third gas passage 126. This test item needs to control the gas source gas to slowly increase the pressure from 0 until the pressurized gas reaches the explosion-proof valve 33 and an explosion occurs, and then the air pressure value at the time of the explosion is recorded as the explosion value of the explosion-proof valve.

[0068] Note: The explosion-proof valve burst test is a random inspection, not a full inspection. The product will be scrapped after the test. However, it is a mandatory test item for each batch of product production.

[0069] 3. Explosion-proof valve breathing test.

[0070] Place the battery cover assembly 3 to be tested upright (with the protruding part of the pole facing upward, see Figure 2 and Figure 6 ) in the cover positioning groove 12, and align the pressing piece 2 on the base 1, so that the battery cover assembly 3 is clamped and positioned between the base 1 and the pressing piece 2; compressed air is introduced from the third gas passage 126. This test item requires the introduction of 0.3MPa compressed gas, and then the entire fixture is placed in a water tank filled with clean water and the water covers the fixture. While continuously introducing compressed gas for 10 seconds, observe the surface of the explosion-proof valve 33 through the observation port 23. If bubbles emerge, it means leakage and the airtightness is unqualified. Otherwise, it is qualified.

[0071] Place the battery cover assembly 3 to be tested upside down (with the protruding part of the pole facing downward, see Figure 3 and Figure 7 ) in the cover positioning groove 12, and align the pressing piece 2 on the base 1, so that the battery cover assembly 3 is clamped and positioned between the base 1 and the pressing piece 2; compressed air is introduced from the third gas passage 126. This test item requires the introduction of 0.15MPa compressed gas, and then the entire fixture is placed in a water tank filled with clean water and the water covers the fixture. While continuously introducing compressed gas for 10 seconds, observe the surface of the explosion-proof valve 33 through the observation port 23. If bubbles emerge, it means leakage and the airtightness is unqualified. Otherwise, it is qualified.

[0072] The above embodiments are only for full disclosure and not for limiting the present invention. Any replacement of equivalent technical features based on the creative purpose of the present invention without creative labor shall be deemed as the scope of disclosure of this application. It is understandable that the battery cover assembly test fixture can be implemented as an independent product in the form of manufacturing, sales, etc., or it can be implemented in the form of manufacturing, sales, use, etc. together with other test auxiliary devices of the battery cover assembly test equipment.

Claims

1. A battery cover assembly test fixture, the battery cover assembly comprising a cover and a first pole, a second pole and an explosion-proof valve spaced apart on the cover; characterized in that: The battery cover assembly test fixture includes a base and a pressing piece that are aligned with each other and clamp the cover in place; the base is provided with a gas pressure port and a gas passage corresponding to the positions of the first pole, the second pole and the explosion-proof valve; the pressing piece is provided with an observation port with a visible area covering the first pole, the second pole and the explosion-proof valve.

2. The battery cover assembly test fixture according to claim 1, characterized in that: The mating surfaces of the base and the pressing piece are provided with a cover plate positioning mechanism, and the cover plate positioning mechanism comprises a cover plate positioning groove concavely opened on the mating surface of the base and a cover plate pressing portion provided on the mating surface of the pressing piece.

3. The battery cover assembly test fixture according to claim 1, characterized in that: The observation port is provided in the middle of the pressing piece so as to penetrate from top to bottom, and the cover plate pressing portion is formed at the bottom of the pressing piece located at the periphery of the observation port.

4. The battery cover assembly test fixture according to claim 3, characterized in that: The observation port comprises a straight cylindrical port located in the lower section and a gradually opening port located in the upper section.

5. The battery cover assembly test fixture according to claim 2, characterized in that: The gas passage is an L-shaped passage, the gas inlet end of the gas passage is opened on the side wall of the base, and the gas outlet end of the gas passage serves as the gas pressure port and is opened in the cover plate positioning groove.

6. The battery cover assembly test fixture according to claim 5, characterized in that: The air inlet end of the gas passage is provided with an air pipe quick connector.

7. The battery cover assembly test fixture according to claim 2, characterized in that: The corners of the mating surface of the base are provided with convex pillows, and the corners of the mating surface of the pressing piece are provided with concave pillows for the convex pillows to be embedded and matched.

8. The battery cover assembly test fixture according to claim 5, characterized in that: In the positioning groove of the cover plate, there are respectively provided, around each of the gas pressure ports, making way for the protruding parts of the first pole, the second pole and the explosion-proof valve.

9. The battery cover assembly test fixture according to claim 8, characterized in that: The periphery of each of the said giving way grooves is respectively provided with a sealing ring assembly groove, and a sealing ring is correspondingly assembled in each of the sealing ring assembly grooves.

10. The battery cover assembly test fixture according to claim 1, characterized in that: The battery cover assembly test fixture also includes a locking mechanism for locking the base and the pressing piece that are aligned with each other.

11. The battery cover assembly test fixture according to claim 10, characterized in that: The locking mechanism is a bolt that locks the base and the pressing piece; or, the locking mechanism is a snap mechanism that locks the base and the pressing piece.

12. A battery cover assembly testing device, characterized in that: A battery cover assembly test fixture comprising any one of claims 1 to 11, further comprising a gas supply device for supplying test gas to the gas passage.

13. The battery cover assembly testing device according to claim 12, characterized in that: The battery cover assembly testing equipment also includes a water tank for immersing the battery cover assembly testing fixture.

14. The battery cover assembly testing device according to claim 12, characterized in that: The battery cover assembly testing equipment also includes a gas sensing mechanism disposed at the observation port.

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