Breathing blasting test fixture for new energy battery cover plate

Abstract

The utility model discloses a breathing blasting test fixture for a new energy battery cover plate. The breathing blasting test fixture is characterized by comprising an upper cavity and a lower cavity, an upper cavity is arranged in the middle of the upper cavity, a first vent hole is formed in the middle of the left side face and communicated with the upper cavity, four first positioning pins are arranged at the four corners of the upper cavity, a lower cavity is arranged in the middle of the lower cavity, two symmetrical first grooves are formed in the left side and the right side of the lower cavity, a plurality of second positioning holes are formed in the bottoms of the first grooves, and a plurality of sets of third positioning holes are formed in the front side and the rear side of the first grooves. And a first positioning hole matched with the first positioning pin is formed in the lower cavity. According to the utility model, the upper cavity and the lower cavity can be quickly positioned by arranging the first positioning pin, and the plurality of second positioning holes and the plurality of third positioning holes are respectively inserted with the second positioning pins and the third positioning pins for quickly positioning various different products to be tested, so that the test fixture is suitable for testing various products with different specifications, the test efficiency is greatly improved, and the test cost is reduced. And the production cost of a plurality of test jigs and a large amount of labor cost are saved.

Description

Technical Field

[0001] The utility model relates to the technical field of new energy batteries, in particular to a breathing and blasting test fixture for a new energy battery cover plate. Background Art

[0002] At present, new energy batteries generally adopt a square aluminum shell structure, which consists of a shell and a battery cover plate. The battery cover plate not only provides a sealed space for the new energy battery, but also serves as an energy transmission medium for the new energy battery. Its structure directly affects the reliability and manufacturing cost of the battery pack. The reliability of the battery pack directly affects the working performance of the vehicle and the personal safety of passengers. Therefore, for the battery structure, especially the battery cover plate, in addition to some necessary tests, it is also necessary to sample and conduct enhanced destructive tests during the manufacturing process.

[0003] At present, the tests that must be carried out on all new energy battery cover plates include the electrical performance test of the pole column and the cover plate and the airtightness test of the cover plate structure. These two tests will not damage the cover plate structure and performance. In addition, many destructive verifications need to be sampled during the FAE stage and the product manufacturing stage, such as salt spray test, tensile test, baking test, creep test, water detection test, breathing and blasting test, etc. The breathing cycle test is used to detect the functionality and life of new energy batteries, mainly for fatigue resistance test of batteries, also called cycle life test. The breathing cycle test simulates the actual situation of the battery during use by controlling the bidirectional air pressure, so as to accurately reflect the true performance characteristics of the bursting disc, and detect whether the bursting disc can withstand multiple cyclic changes under a certain pressure to evaluate the performance and stability of the battery. The blasting test is to conduct a high-pressure destruction on the battery to simulate the safety performance of the battery under extreme working conditions, which belongs to a safety destruction test. However, the existing breathing and blasting tests are each dedicated to a specific type of top cover with a dedicated breathing and blasting test fixture. In the actual production process, multiple types of top cover products are produced simultaneously, resulting in cross-installation and disassembly of multiple breathing and blasting test fixtures, which is a cumbersome and inconvenient process, greatly consuming manpower and material resources, and increasing the production cost and R & D cost of the enterprise. Summary of the Utility Model

[0004] To solve the problem that in the existing breathing and bursting tests for new energy battery covers, a dedicated breathing and bursting test fixture is used for each type of top cover, and multiple breathing and bursting test fixtures are cross-installed and disassembled for use, which is a cumbersome process and inconvenient to operate. The present utility model provides a breathing and bursting test fixture for new energy battery covers. By providing a plurality of first positioning pins on the upper cavity body and corresponding first positioning holes on the lower cavity body to be inserted with the first positioning pins, the upper and lower cavity bodies can be quickly positioned. By providing a first groove, a second groove, a plurality of second positioning holes and a third positioning hole on the lower cavity body for quickly positioning a variety of different products to be tested, the test fixture of this patent is applicable to the testing of a variety of different specifications of products, without the need for cross-installation and disassembly of multiple test fixtures, with a simple structure and convenient operation, greatly improving the test efficiency and saving the production costs of multiple test fixtures and a large amount of labor costs.

[0005] To achieve the above object, the present utility model provides a breathing and bursting test fixture for new energy battery covers, which is characterized in that it includes an upper cavity body and a lower cavity body that are detachably and fixedly connected;

[0006] The upper cavity body is detachably connected to the upper template of the breathing and bursting test equipment by bolts. In the middle of the lower bottom surface of the upper cavity body, there is an upper cavity chamber that is square with rounded corners at the four corners. The opening size of the upper cavity chamber is larger than the outer shape size of the explosion-proof valve on the battery cover to be tested. Around the upper cavity chamber on the lower bottom surface of the upper cavity body, there is a first sealing groove, and a first O-ring is provided in the first sealing groove. In the middle of the left side surface of the upper cavity body, there is a first ventilation hole. The outer end of the first ventilation hole is provided with a threaded hole, and the inner end is communicated with the upper cavity chamber. The threaded hole is used to connect external compressed air through a quick air connection joint and input the compressed air into the upper cavity chamber. At the four corners of the upper plane of the upper cavity body, there are 4 first positioning pins arranged in an array and evenly distributed;

[0007] The lower cavity is detachably connected to the lower template of the breathing and blasting test equipment by bolts. In the middle of the upper plane of the lower cavity, there is a lower chamber that matches the shape of the explosion-proof valve. In the middle of the bottom of the lower chamber, there is a second ventilation hole for allowing compressed air to enter the bottom of the lower cavity from the equipment. Around the lower chamber on the upper plane of the lower cavity, there is a second sealing groove, and a second O-ring is arranged in the second sealing groove. Around the second ventilation hole on the lower plane of the lower cavity, there is a third sealing groove, and an annular gasket is arranged in the third sealing groove; at the corresponding positions of the upper plane of the lower cavity corresponding to the first positioning pins, there are first positioning holes that match; on the left and right sides of the lower chamber on the upper plane of the lower cavity, there are two symmetric first grooves for avoiding the liquid injection hole bosses on the bottom surface of the workpiece to be tested placed horizontally. The outer ends of the first grooves penetrate the outer side walls of the corresponding sides of the lower cavity. At the bottom of the first grooves, there are multiple second positioning holes corresponding to the positions of the liquid injection holes of different workpieces to be tested. On the front and rear sides of the first grooves, there are several groups of third positioning holes, and each group has 4 third positioning holes evenly distributed in an array. And each group of third positioning holes is arranged outside the front and rear sides of different workpieces to be tested and close to the corresponding sides. During work, place the workpiece to be tested horizontally, and insert second positioning pins into the corresponding second positioning holes and liquid injection holes according to the position of the liquid injection hole of the workpiece to be tested; select a corresponding group of third positioning holes on the front and rear sides of the workpiece to be tested and insert third positioning pins, so as to quickly position the workpiece to be tested on the lower cavity.

[0008] Furthermore, on the front and rear sides of the lower chamber on the upper plane of the lower cavity, there are two symmetric second grooves for avoiding the liquid injection hole bosses on the bottom surface of the workpiece to be tested placed longitudinally. The outer ends of the second grooves penetrate the outer side walls of the corresponding sides of the lower cavity. At the bottom of the second grooves, there are multiple second positioning holes corresponding to the positions of the liquid injection holes of different workpieces to be tested. On the left and right sides of the second grooves, there are several groups of third positioning holes, and each group has 4 third positioning holes evenly distributed in an array. And each group of third positioning holes is arranged outside the left and right sides of different workpieces to be tested and close to the corresponding sides. During work, place the workpiece to be tested longitudinally, and insert second positioning pins into the corresponding second positioning holes and liquid injection holes according to the position of the liquid injection hole of the workpiece to be tested; select a corresponding group of third positioning holes on the left and right sides of the workpiece to be tested and insert third positioning pins, so as to quickly position the workpiece to be tested on the lower cavity.

[0009] Furthermore, the first positioning pin and the first positioning hole are in clearance fit, and the fit clearance is set to 0.05 - 0.1 mm. The second positioning pin and the second positioning hole are in clearance fit, and the fit clearance is set to 0.05 - 0.1 mm. The third positioning pin and the third positioning hole are in clearance fit, and the fit clearance is set to 0.05 - 0.1 mm.

[0010] The four third positioning pins corresponding to the positioning of each product to be tested are all centrally symmetrically distributed relative to the center of the lower cavity, and the gap between the third positioning pins and the corresponding side edges of the product to be tested is set to 0.05-0.4 mm.

[0011] Furthermore, four screw holes with countersunk holes on the upper ends are evenly distributed in an array at the four corners of the upper plane of the upper cavity, an enlarged layer hole is provided at the lower end of the screw hole, a locking screw is provided in the screw hole, the first positioning pin is provided in the layer hole, and the locking screw passes through the screw hole and is threadedly locked with the upper end of the first positioning pin.

[0012] Furthermore, first avoidance grooves are provided in the middle of the front and rear sides of the lower bottom of the upper cavity, for avoiding the square bosses on the front and rear sides of the upper plane of the product to be tested.

[0013] Furthermore, a second avoidance groove is provided in the middle of the front and rear sides of the upper plane of the lower cavity, which is used to avoid the circular bosses on the front and rear sides of the lower plane of the product to be tested, and the depth of the second avoidance groove is greater than the depth of the second groove.

[0014] Furthermore, a fourth positioning hole is provided in the middle of the upper plane of the upper cavity near the rear side, and a waist-shaped blind hole is provided near the front side. The fourth positioning hole and the waist-shaped blind hole are used to insert a fourth positioning pin at the corresponding position of the template on the test equipment to position the upper cavity; 8 internal threaded holes evenly distributed in two rows are provided on the front and rear sides of the upper plane of the upper cavity, which are used to lock and fix the upper cavity and the template on the test equipment through bolts.

[0015] Furthermore, a fifth positioning hole is provided in the middle of the bottom surface of the second avoidance groove on the front and rear sides of the lower cavity, which is used to insert a fifth positioning pin at a position corresponding to the lower template of the test equipment to position the lower cavity; 12 first bolt holes with countersunk heads are evenly distributed in two rows on the front and rear sides of the upper plane of the lower cavity, which are used to fix the lower cavity and the lower template of the test equipment by bolt locking, and the countersunk holes at the upper ends of the four middle first bolt holes are connected to the second avoidance groove.

[0016] Furthermore, a sixth positioning hole is arranged in parallel on the inner side of the fifth positioning hole in the middle of the bottom surface of the second avoidance groove, and is connected with the fifth positioning hole to form an 8-shape, and the sixth positioning hole is used to insert a sixth positioning pin at a position corresponding to the lower template of another test device to position the lower cavity;

[0017] The inner sides of the four first bolt holes in the middle of the upper plane of the lower cavity are each provided with a second bolt hole parallel to the first bolt hole, the second bolt hole is connected with the corresponding first bolt hole to form an 8-shape, the second bolt hole is used to fix the lower cavity and the lower template of another testing equipment by bolt locking, and the countersunk hole at the upper end of the second bolt hole is also connected to the second avoidance groove.

[0018] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0019] 1. By providing the first and second grooves and multiple second and third positioning pins, the present utility model is respectively used for quickly positioning various different specifications of products to be tested, enabling the jig of this patent to be applicable to the breathing and bursting tests of various different specifications of products, solving the problems of cross-installation and disassembly of multiple test jigs in the prior art, saving the production costs of multiple breathing and bursting test jigs and a large amount of labor costs, and greatly improving the test efficiency;

[0020] 2. By providing the first positioning pin, the upper and lower cavities can be quickly and accurately positioned, further improving the test efficiency. The first positioning pin is installed and fixed by a locking screw, which is convenient for later maintenance and replacement;

[0021] 3. By providing the first and second relief grooves, the present test jig can be applicable to new energy battery covers with bosses on the front and rear sides of the upper plane or the lower plane, improving the practicability of the present test jig;

[0022] 4. By providing the fifth and sixth positioning holes and the first and second bolt holes, the present test jig can be used for two breathing and bursting test devices, improving the versatility of the present test jig. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic cross-sectional structure diagram of the product 1 to be tested placed horizontally according to the embodiment of the present utility model;

[0024] Figure 2 It is an exploded structure diagram according to the embodiment of the present utility model;

[0025] Figure 3 It is a schematic diagram of the positioning structure between the product 1 to be tested and the lower cavity according to the embodiment of the present utility model;

[0026] Figure 4 It is a schematic diagram of the bottom structure of the upper cavity according to the embodiment of the present utility model;

[0027] Figure 5 It is a schematic diagram of the upper part structure of the upper cavity according to the embodiment of the present utility model;

[0028] Figure 6 It is a schematic diagram of the upper part structure of the lower cavity according to the embodiment of the present utility model;

[0029] Figure 7 It is a schematic longitudinal cross-sectional structure diagram of the product 2 to be tested placed vertically according to the embodiment of the present utility model;

[0030] Figure 8 It is a schematic diagram of the positioning structure between the product 2 to be tested and the lower cavity according to the embodiment of the present utility model;

[0031] Figure 9 Schematic diagram of the positioning structure between the product to be tested 3 and the lower cavity in the embodiment of the present utility model;

[0032] Figure 10 Schematic diagram of the positioning structure between the product to be tested 4 and the lower cavity in the embodiment of the present utility model;

[0033] Figure 11 Schematic diagram of the circular boss and the second avoidance groove on the product to be tested 4 in the embodiment of the present utility model.

[0034] In the figure: 1. Upper cavity, 101. Upper chamber, 102. First sealing groove, 103. Screw hole, 104. Layer hole, 105. First ventilation hole, 106. Threaded hole, 107. First avoidance groove, 108. Fourth positioning hole, 109. Waist-shaped blind hole, 110. Internal threaded hole, 2. Upper cavity, 201. Upper chamber, 202. Second ventilation hole, 203. Second sealing groove, 204. First groove, 205. Second groove, 206. Second avoidance groove, 207. First positioning hole, 208. Second positioning hole, 209. Third positioning hole, 210. Fifth positioning hole, 211. First bolt hole, 212. Sixth positioning hole, 213. Second bolt hole, 3. Locking screw, 4. First positioning pin, 5. Second positioning pin, 6. Third positioning pin, 7. First O-ring, 8. Second O-ring, 9. Annular seal, 10a. Product to be tested 1, 10b. Product to be tested 2, 10c. Product to be tested 3, 10d. Product to be tested 4, 1001. Explosion-proof valve, 1002. Liquid injection hole, 1003. Square boss, 1004. Circular boss. Detailed implementation manners

[0035] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0036] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present utility model.

[0037] Such as Figures 1 to 6As shown in the figure, an embodiment of the utility model includes an upper cavity 1 and a lower cavity 2 that are detachably and fixedly connected;

[0038] The upper cavity 1 is detachably connected to the upper template of the breathing and bursting test equipment by bolts. In the middle of the lower bottom surface of the upper cavity 1, there is an upper chamber 101 that is square with rounded corners at the four corners. The opening size of the upper chamber 101 is larger than the outer dimension of the explosion-proof valve 1001 on the battery cover to be tested. Around the upper chamber 101 on the lower bottom surface of the upper cavity 1, there is a first sealing groove 102 with the same shape as the outer shape of the upper chamber. A first O-ring 7 is provided in the first sealing groove 102. In the middle of the left side surface of the upper cavity 1, there is a first ventilation hole 105. A threaded hole 106 is provided at the outer end of the first ventilation hole 105, and the inner end is communicated with the upper chamber 101. The threaded hole 106 is used to connect external compressed air through a quick air connection and input the compressed air into the upper chamber 101; at the four corners of the upper plane of the upper cavity 1, there are 4 first positioning pins 4 arranged in an array;

[0039] The lower cavity 2 is detachably connected to the lower template of the breathing and bursting test equipment by bolts. In the middle of the upper plane of the lower cavity 2, there is a lower chamber 201 that matches the outer shape of the explosion-proof valve 1001. In the middle of the bottom of the lower chamber 201, there is a second ventilation hole 202 for realizing the input of compressed air from the bottom of the lower cavity 2 into the equipment. Around the lower chamber 201 on the upper plane of the lower cavity 2, there is a second sealing groove 203. A second O-ring 8 is provided in the second sealing groove 203. Around the second ventilation hole 202 on the lower plane of the lower cavity 2, there is a third sealing groove, and an annular gasket 9 is provided in the third sealing groove; at the positions corresponding to the first positioning pins 4 on the upper plane of the lower cavity 2, there are first positioning holes 207 that match; on the left and right sides of the lower chamber 201 on the upper plane of the lower cavity 2, there are two symmetric first grooves 204 for avoiding the liquid injection hole bosses on the lower bottom surface of the workpiece to be tested placed horizontally. The outer ends of the first grooves 204 penetrate the outer side walls of the corresponding sides of the lower cavity 2. At the bottom of the left first groove 204, there is 1 second positioning hole 208. At the bottom of the right first groove 204, there are 2 second positioning holes 208 arranged side by side. The 3 second positioning holes 208 correspond to the positions of the liquid injection holes 1002 of different products to be tested respectively. On the front and rear sides of the first grooves 204, there are 10 groups of third positioning holes 209, and each group has 4 third positioning holes 209 arranged in an array. And each group of third positioning holes 209 is arranged on the outer sides of the front and rear sides of different products to be tested and is close to the corresponding sides,

[0040] As Figure 1 、 3 As shown in the figure, during operation, the product 10a to be tested is placed horizontally on the lower cavity 2. According to the position of the liquid injection hole 1002 of the product 10a to be tested, a second positioning pin 5 is inserted into the corresponding second positioning hole 208 and the liquid injection hole 1002; Select on the front and rear sides of the product 10a to be tested Figure 3Four third positioning pins 6 are inserted into the four third positioning holes 209 in it, so that the product 10a to be measured can be quickly positioned on the lower cavity 2.

[0041] Furthermore, on the upper plane of the lower cavity 2, there are two symmetric second grooves 205 on the front and rear sides of the lower chamber 201, which are used to clear the liquid injection hole bosses on the bottom surface of the workpiece to be measured placed longitudinally. The outer ends of the second grooves 205 penetrate through the outer side walls on the corresponding sides of the lower cavity. There is 1 second positioning hole 208 at the bottom of the rear second groove 205, and 3 second positioning holes 208 are arranged in parallel at the bottom of the front second groove 205. The 4 second positioning holes 208 correspond to the positions of the liquid injection holes 1002 of different products to be measured. There are 10 groups of third positioning holes 209 on the left and right sides of the second groove 205, and each group has 4 third positioning holes 209 arranged in an array and evenly distributed, and each group of third positioning holes 209 is arranged outside the left and right sides of different products to be measured and close to the corresponding sides;

[0042] As Figure 8 shown, during operation, the product 10b to be measured is placed longitudinally on the lower cavity 2, and the second positioning pins 5 are inserted into the corresponding second positioning holes 208 and the liquid injection holes 1002 according to the positions of the liquid injection holes 1002 of the product 10b to be measured; Four of the third positioning holes 209 shown in the figure are selected on the left and right sides of the product 10b to be measured and the third positioning pins 6 are inserted, so that the product 10b to be measured can be quickly positioned on the lower cavity 2.

[0043] Furthermore, the first positioning pin 4 is in clearance fit with the first positioning hole 207, and the fit clearance is set to 0.05 - 0.1 mm. The second positioning pin 5 is in clearance fit with the second positioning hole 208, and the fit clearance is set to 0.05 - 0.1 mm. The third positioning pin 6 is in clearance fit with the third positioning hole 209, and the fit clearance is set to 0.05 - 0.1 mm.

[0044] The four third positioning pins 6 corresponding to the positioning of each product to be measured are centrosymmetrically distributed with respect to the center of the lower cavity 2, and the clearance between the third positioning pin 6 and the corresponding side of the product to be measured is set to 0.05 - 0.4 mm.

[0045] Furthermore, as Figure 1 shown, at the four corners of the upper plane of the upper cavity 2, there are 4 screw holes 103 with counterbored holes at the upper ends arranged in an array. There are enlarged layer holes 104 at the lower ends of the screw holes 103. Locking screws 3 are arranged in the screw holes 103. The first positioning pin 4 is arranged in the layer hole 104, and the locking screw 3 passes through the screw hole 103 and is threadedly locked to the upper end of the first positioning pin 4.

[0046] The first positioning pin 4 is connected and fixed to the upper cavity 1 with the locking screw 3, which is convenient for the installation and fixation of the first positioning pin 4 to the upper cavity 1 and also convenient for later maintenance and replacement.

[0047] Furthermore, asFigure 4 , 7 As shown, first avoidance grooves 107 are provided in the middle of the front and rear sides of the lower bottom of the upper cavity 1 to avoid the square bosses 1003 on the front and rear sides of the upper plane of the product to be tested 10b.

[0048] Further, such as Figure 11 As shown, a second avoidance groove 206 is provided in the middle of the front and rear sides of the upper plane of the lower cavity 2 , and the depth of the second avoidance groove 206 is greater than the depth of the second groove 205 .

[0049] When working, Figure 10 As shown, the product to be tested 10d is placed longitudinally on the lower cavity 2, and a second positioning pin 5 is inserted into the corresponding second positioning hole 208 and the injection hole 1002 according to the position of the injection hole 1002 of the product to be tested 10d; and a third positioning pin 6 is inserted into four third positioning holes 209 in the figure on the left and right sides of the product to be tested 10d, so that the product to be tested 10d is quickly positioned on the lower cavity 2;

[0050] like Figure 11 As shown, the circular bosses 1004 on the front and rear sides of the lower plane of the product to be tested 10d are placed in the second avoidance groove 206 to prevent damage to the product to be tested 10d.

[0051] Further, such as Figure 5 As shown, a fourth positioning hole 108 is provided near the rear side in the middle of the upper plane of the upper cavity 1, and a waist-shaped blind hole 109 is provided near the front side. The fourth positioning hole 108 and the waist-shaped blind hole 109 are both used to insert a fourth positioning pin at the corresponding position of the template on the test equipment to position the upper cavity 1; 8 internal threaded holes 110 are evenly distributed in two rows on the front and rear sides of the upper plane of the upper cavity 1, which are used to lock and fix the upper cavity 1 with the template on the test equipment through bolts.

[0052] Further, such as Figure 6 As shown, a fifth positioning hole 210 is provided in the middle of the bottom surface of the second avoidance groove 206 on the front and rear sides of the lower cavity 2, which is used to insert the fifth positioning pin at the corresponding position of the lower template of the test equipment to position the lower cavity 2; 12 first bolt holes 211 with countersunk heads are evenly distributed in two rows on the front and rear sides of the upper plane of the lower cavity 2, which are used to fix the lower cavity 2 and the lower template of the test equipment by bolt locking, and the countersunk holes at the upper ends of the four middle first bolt holes 211 are connected to the second avoidance groove 206.

[0053] Further, such as Figure 6 As shown, a sixth positioning hole 212 is also arranged in parallel on the inner side of the fifth positioning hole 210 in the middle of the bottom surface of the second avoidance groove 206, and is connected with the fifth positioning hole 210 to form an 8-shape. The sixth positioning hole 212 is used to insert a sixth positioning pin at a position corresponding to the lower template of another test device to position the lower cavity 2;

[0054] On the inner sides of the four first bolt holes 211 in the middle of the upper plane of the lower cavity 2, second bolt holes 213 arranged in parallel with the first bolt holes 211 are provided. The second bolt holes 213 and the corresponding first bolt holes 211 are connected to form an 8-shaped configuration. The second bolt holes 213 are used for locking and fixedly connecting the lower cavity 2 with the lower template of another testing device through bolts. The counterbore holes at the upper ends of the second bolt holes 213 are also communicated with the second avoidance grooves 206.

[0055] The working principle of the embodiment of the present utility model: Position and lock the upper cavity 1 with the upper template of the testing device, position and lock the lower cavity 2 with the lower template of the testing device, horizontally place the product to be tested 10a on the upper plane of the lower cavity 2 (as Figure 3 shown), select to insert the second positioning pin 5 at the position of the middle liquid injection hole 1002, select to insert the third positioning pin 6 at the positions of the 4 third positioning holes 209 in Figure 3 , position the product to be tested 10a on the lower cavity 2, start the testing device, lower the upper cavity until its lower plane fits with the upper plane of the product to be tested 10a, and then the breathing test and the bursting test can be carried out. Figure 3 Breathing test: Compressed air is alternately introduced into the first ventilation holes 105 on the upper cavity 1 and the second ventilation holes 202 at the bottom of the lower cavity 2. The inlet air pressure from the upper cavity is set to 0.15 MPa, and the inlet air pressure from the lower cavity is set to 0.3 MPa. The ventilation is alternately carried out at a frequency of maintaining the state for 30S, and after cycling 10 times, if the explosion-proof valve 1001 of the product to be tested 10a does not leak air, the test is qualified.

[0056] Bursting test: Compressed air is introduced into the second ventilation holes 202 at the bottom of the lower cavity 2. The explosion-proof valve 1001 can rupture and exhaust air in time under the air pressure of 0.6 ± 0.2 MPa, and there is no micro air leakage phenomenon before bursting, including the welds, then the test is qualified.

[0057] The above is only the preferred embodiment of the present utility model. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the technical principle of the present utility model, several improvements and replacements can be made, and these improvements and replacements should also be regarded as the protection scope of the present utility model.

[0058] ​

Claims

1. A breathing explosion test fixture for a new energy battery cover, characterized in that: It includes an upper cavity and a lower cavity which are detachably fixedly connected; The upper cavity is detachably connected to the upper template of the breathing explosion test equipment by bolts, a square upper cavity with rounded corners is provided in the middle of the lower bottom surface of the upper cavity, the opening size of the upper cavity is larger than the outer size of the explosion-proof valve on the battery cover to be tested, a first sealing groove is provided on the periphery of the cavity on the lower bottom surface of the upper cavity, a first O-ring is provided in the first sealing groove, a first vent hole is provided in the middle of the left side surface of the upper cavity, a threaded hole is provided at the outer end of the first vent hole, and the inner end is connected to the upper cavity, the threaded hole is used to connect external compressed air through a quick air joint, and the compressed air is input into the upper cavity; 4 first positioning pins evenly distributed in an array are provided at the four corners of the upper plane of the upper cavity; The lower cavity is detachably connected to the lower template of the breathing explosion test equipment by bolts, a lower chamber matching the shape of the explosion-proof valve is provided in the middle of the upper plane of the lower cavity, a second vent is provided in the middle of the bottom of the lower cavity, which is used to allow compressed air to enter the bottom of the lower cavity from the equipment, a second sealing groove is provided on the periphery of the upper and lower chambers of the upper plane of the lower cavity, a second O-ring is provided in the second sealing groove, a third sealing groove is provided on the periphery of the second vent on the lower plane of the lower cavity, and an annular sealing gasket is provided in the third sealing groove; first positioning holes matching the first positioning pins are provided on the upper plane of the lower cavity; two symmetrical first grooves are provided on the left and right sides of the upper and lower chambers of the upper plane of the lower cavity, which are used to avoid air leakage. The outer end of the first groove passes through the outer side wall of the corresponding side of the lower cavity; the bottom of the first groove is provided with a plurality of second positioning holes corresponding to the positions of the injection holes of different products to be tested; the front and rear sides of the first groove are provided with a plurality of groups of third positioning holes; each group is provided with 4 third positioning holes evenly distributed in an array, and each group of third positioning holes is arranged on the outer side of the front and rear sides of different products to be tested and close to the corresponding sides; when working, the product to be tested is placed horizontally, and second positioning pins are inserted into the corresponding second positioning holes and the injection holes according to the positions of the injection holes of the product to be tested; a corresponding group of third positioning holes is selected on the front and rear sides of the product to be tested to insert third positioning pins, so that the product to be tested can be quickly positioned on the lower cavity.

2. A new energy battery cover breathing explosion test fixture according to claim 1, characterized in that: Two symmetrical second grooves are provided on the front and rear sides of the upper and lower chambers on the upper plane of the lower cavity body, which are used to avoid the injection hole boss on the lower bottom surface of the workpiece to be tested placed longitudinally. The outer end of the second groove passes through the corresponding side outer wall of the lower cavity body. A plurality of second positioning holes are provided on the bottom of the second groove corresponding to the injection hole positions of different products to be tested. Several groups of third positioning holes are provided on the left and right sides of the second groove, each group is provided with 4 third positioning holes evenly distributed in an array, and each group of third positioning holes is arranged on the outside of the left and right sides of different products to be tested and close to the corresponding sides. When working, the product to be tested is placed longitudinally, and second positioning pins are inserted into the corresponding second positioning holes and the injection holes according to the injection hole position of the product to be tested; a corresponding group of third positioning holes is selected on the left and right sides of the product to be tested to insert a third positioning pin, so that the product to be tested can be quickly positioned on the lower cavity.

3. A new energy battery cover breathing explosion test fixture according to claim 2, characterized in that: The first positioning pin and the first positioning hole have a clearance fit, and the fit clearance is set to 0.05-0.1 mm; the second positioning pin and the second positioning hole have a clearance fit, and the fit clearance is set to 0.05-0.1 mm; the third positioning pin and the third positioning hole have a clearance fit, and the fit clearance is set to 0.05-0.1 mm; The four third positioning pins corresponding to the positioning of each product to be tested are all centrally symmetrically distributed relative to the center of the lower cavity, and the gap between the third positioning pins and the corresponding side edges of the product to be tested is set to 0.05-0.4 mm.

4. A breathing explosion test fixture for a new energy battery cover according to claim 1, characterized in that: Four screw holes with countersunk holes on the upper ends are evenly distributed in an array at the four corners of the upper plane of the upper cavity. An enlarged layer hole is provided at the lower end of the screw hole. A locking screw is provided in the screw hole. The first positioning pin is provided in the layer hole. The locking screw passes through the screw hole and is threadedly locked with the upper end of the first positioning pin.

5. A breathing explosion test fixture for a new energy battery cover according to claim 1, characterized in that: The first avoidance grooves are provided in the middle of the front and rear sides of the lower bottom of the upper cavity, for avoiding the square bosses on the front and rear sides of the upper plane of the product to be tested.

6. A breathing explosion test fixture for a new energy battery cover according to claim 2, characterized in that: A second avoidance groove is provided in the middle of the front and rear sides of the upper plane of the lower cavity, which is used to avoid the circular bosses on the front and rear sides of the lower plane of the product to be tested, and the depth of the second avoidance groove is greater than the depth of the second groove.

7. A breathing explosion test fixture for a new energy battery cover according to claim 1, characterized in that: A fourth positioning hole is provided in the middle of the upper plane of the upper cavity near the rear side, and a waist-shaped blind hole is provided near the front side. The fourth positioning hole and the waist-shaped blind hole are both used to insert a fourth positioning pin at the corresponding position of the template on the test equipment to position the upper cavity; 8 internal threaded holes are evenly distributed in two rows on the front and rear sides of the upper plane of the upper cavity, which are used to lock and fix the upper cavity and the template on the test equipment through bolts.

8. A breathing explosion test fixture for a new energy battery cover according to claim 6, characterized in that: A fifth positioning hole is provided in the middle of the bottom surface of the second avoidance groove on the front and rear sides of the lower cavity, which is used to insert the fifth positioning pin at the corresponding position of the lower template of the test equipment to position the lower cavity; 12 first bolt holes with countersunk heads are evenly distributed in two rows on the front and rear sides of the upper plane of the lower cavity, which are used to fix the lower cavity and the lower template of the test equipment by bolt locking, and the countersunk holes at the upper ends of the four middle first bolt holes are connected to the second avoidance groove.

9. A new energy battery cover breathing explosion test fixture according to claim 8, characterized in that: A sixth positioning hole is arranged in parallel on the inner side of the fifth positioning hole in the middle of the bottom surface of the second avoidance groove and is connected with the fifth positioning hole to form an 8-shape. The sixth positioning hole is used to insert a sixth positioning pin at a position corresponding to the lower template of another test device to position the lower cavity; The inner sides of the four first bolt holes in the middle of the upper plane of the lower cavity are each provided with a second bolt hole parallel to the first bolt hole, the second bolt hole is connected with the corresponding first bolt hole to form an 8-shape, the second bolt hole is used to fix the lower cavity and the lower template of another testing equipment by bolt locking, and the countersunk hole at the upper end of the second bolt hole is also connected to the second avoidance groove.

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