Explosion strength testing tool for breathable pressure release valve

Abstract

The utility model discloses a burst strength testing tool for a breathable pressure release valve. The burst strength testing tool comprises a base, a clamp is fixed on the base, and an upper pressing plate is fixed on the upper surface of the clamp; a plurality of first through holes are formed in the clamp, second through holes matched with the first through holes in position are formed in the upper pressing plate, and a pressure release valve embedding cavity is formed in each first through hole and used for installing a sample to be tested; a plurality of air inlets and an air outlet are formed in the base, the air inlets and the air outlet are connected with a high-pressure air cavity formed in the base, and the high-pressure air cavity is communicated with the first through hole and the second through hole. The ventilation pressure release valve can be used for carrying out an explosion test at any pressure ranging from 0.01 Mpa to 1.5 Mpa, can be used for carrying out a breathing test at any environment temperature ranging from-70 DEG C to 200 DEG C, and can also be used for carrying out a breathing test at any pressure and any duration, so that the reliability of the ventilation pressure release valve under different pressure conditions is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of testing tools, in particular to a burst strength testing tool for a breathable pressure relief valve. Background Art

[0002] The vent valve is mainly used as the top cover of batteries (including lithium-ion batteries, sodium-ion batteries, etc.). Its main function is to discharge gases generated by side reactions during the battery's charging and discharging process, while not allowing any liquid to pass through, thereby reducing the internal pressure of the battery cell, thereby improving the performance and life of the battery cell and reducing the cost of mechanical parts. The mainstream pressure relief valve on the market is the explosion-proof valve. When the pressure inside the battery cell reaches a certain threshold, the notch of the explosion-proof valve is broken, thereby achieving the purpose of relieving the pressure of the battery cell. However, at the same time, the battery cell can only be scrapped and cannot be used anymore. Under normal use conditions, the vent valve discharges the gas (mainly CO2, etc.) inside the battery cell, maintaining a low internal pressure state. Under extreme conditions (such as battery cell short circuit), the polymer film material will quickly rupture under certain temperature and pressure conditions, thereby achieving the purpose of quickly relieving the pressure of the battery cell.

[0003] In summary, anti-shock performance is an important performance of the breathable pressure relief valve. Under normal conditions of use of the battery cell, the breathable pressure relief valve needs to withstand an impact strength of 0.6Mpa±0.2Mpa and cannot break. Under extreme conditions such as short circuit, it must meet the requirements of instantaneous pressure relief under lower internal pressure conditions.

[0004] Currently, there are no dedicated testing devices on the market for the burst resistance of vent pressure relief valves. Some testing devices rely on creating a sealed chamber, then introducing compressed gas. The instantaneous burst pressure is used as the valve's burst resistance. This testing method is complex and limited, and it cannot perform burst tests at different temperatures. Utility Model Content

[0005] The purpose of the present utility model is to solve the above-mentioned problem and provide a burst strength test tool for a breathable pressure relief valve.

[0006] In order to achieve the above-mentioned purpose, the present invention specifically adopts the following technical solutions:

[0007] A burst strength test tool for a breathable pressure relief valve, used in an environmental test chamber, comprising: a base;

[0008] A clamp is fixed on the base, and an upper pressing plate is fixed on the upper surface of the clamp;

[0009] The fixture is provided with a plurality of through holes 1, the upper pressing plate is provided with through holes 2 that match the positions of the through holes 1, and the through holes 1 are provided with a pressure relief valve embedding cavity, and the embedding cavity is used to install the sample to be tested;

[0010] The base is provided with a plurality of air inlets and an air outlet, and the air inlets and the air outlet are both connected to a high-pressure gas chamber provided in the base, and the high-pressure gas chamber is communicated with the through hole 1 and the through hole 2.

[0011] Optionally, a plurality of sealing sheets are provided in the plurality of embedding cavities, and the plurality of sealing sheets include at least one sealing sheet containing a hole, and the sealing sheet containing a hole is installed in the embedding cavity where the sample to be tested is located.

[0012] Optionally, the sealing sheet includes a circular sealing sheet and a square sealing sheet, the opening is opened at the center of the sealing sheet containing a hole, and the diameter of the opening is larger than the diameter of the sink of the sample to be tested.

[0013] Optionally, the size of the sealing sheet is larger than the size of the first through hole.

[0014] Optionally, the air inlet includes an air inlet 1 for compressed gas to enter and an air inlet 2 for high-pressure gas to enter;

[0015] Among them, the pressure of compressed gas is 0.7Mpa, and the pressure of high-pressure gas is 1.5Mpa.

[0016] Optionally, a plurality of sealing rings are provided on the end surface of the second clamp in contact with the base, and the high-pressure gas chamber is located inside the sealing rings.

[0017] Optionally, the sealing ring includes a sealing inner ring and a sealing outer ring.

[0018] Optionally, the upper pressing plate and the clamp are positioned and locked by positioning pins, and the clamp and the base are positioned and locked by positioning pins.

[0019] Optionally, the first air inlet, the second air inlet and the air outlet are all vertically arranged at the center of the base and pass through the base.

[0020] Optionally, the sealing sheet is made of silicone rubber.

[0021] The beneficial effects of the utility model are as follows:

[0022] 1. The utility model can conduct burst test at any pressure between 0.01Mpa and 1.5Mpa, and any ambient temperature between -70℃ and 200℃. It can also conduct breathing test at any pressure and any duration to ensure the reliability of the breathable pressure relief valve under different pressure conditions.

[0023] 2. The blasting device of the present invention is easy to operate and has low testing costs. It only requires installing a breathable pressure relief valve into a tooling and passing compressed air or high-pressure CO2 gas.

[0024] In order to more clearly illustrate the structural features and functions of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the test tooling of the present utility model;

[0026] Figure 2 This is a cross-sectional view of the test sample and the circular sealing sheet of the utility model;

[0027] Figure 3 This is a cross-sectional view of the test sample and the square sealing piece of the utility model;

[0028] Figure 4 It is a top view and a cross-sectional view of a circular sample to be tested of the utility model;

[0029] Figure 5 These are top and cross-sectional views of a square sample to be tested according to the present invention.

[0030] Figure numerals: 1, base; 2, fixture; 3, upper pressure plate; 4, through hole 1; 5, through hole 2; 6, sample to be tested; 701, air inlet 1; 702, air inlet 2; 8, air outlet; 901, circular sealing plate; 902, square sealing plate; 10, opening; 11, sink; 12, sealing inner ring; 13, sealing outer ring. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention.

[0032] like Figure 1-Figure 5 As shown, in one embodiment, a burst strength test tool for a breathable pressure relief valve includes a base 1;

[0033] A fixture 2 is fixed on the base 1, and an upper pressing plate 3 is detachably connected to the upper surface of the fixture 2 by a pin. A plurality of vertically arranged through-holes 1 4 are provided in the fixture 2, and a through-hole 2 5 is vertically provided in the upper pressing plate 3 and is located on the same center line as the through-hole 1 4. The through-hole 2 5 has the same diameter as the through-hole 1 4. A pressure relief valve embedding cavity is provided at the junction of the through-hole 1 4 and the through-hole 2 5. When in use, the sample 6 to be tested is installed in the embedding cavity.

[0034] Multiple air inlets and an air outlet 8 are provided in the base 1. Different air inlets can be opened when performing different pressure tests. The air inlets and the air outlet 8 are both connected to the high-pressure gas chamber provided in the base 1, and the gas chamber is connected to through-hole 1 4 and through-hole 2 5. When performing tests, such as testing a circular air-permeable pressure relief valve, the base 1 is locked and fixed in the environmental test chamber, and then the dedicated air-permeable pressure relief valve fixing fixture 2 is positioned by the positioning pin, locked and fixed on the base 1, and then the circular sealing piece 901 is embedded in the corresponding area of ​​the embedded cavity. At the same time, the circular sealing piece 901 is provided with an opening 10 to facilitate the passage of the test gas, and then the circular air-permeable pressure relief valve to be tested is installed in the embedded cavity; at the same time, the square sealing piece 902 needs to be embedded in the corresponding area of ​​another embedded cavity, and the square sealing piece 902 does not have any opening 10, and then the square air-permeable pressure relief valve is installed on the other embedded cavity. Finally, the upper pressure plate 3 is locked and fixed on the fixture 2, and then the side door of the environmental test chamber is closed.

[0035] When the burst pressure under test is ≤0.7Mpa, the high-pressure gas inlet channel needs to be closed and the conventional pressure gas channel needs to be used. When performing the burst test on the breathable pressure relief valve, turn on the main switch, gas source switch, and control program, and adjust the pressure and time levels to be tested. Compressed gas enters from the channel inlet and enters the high-pressure chamber gas chamber, then passes through the channel and the opening 10 of the circular sealing plate 901, continuously impacting the functional sealing membrane of the circular breathable pressure relief valve. If the set pressure does not drop within the set time, the circular breathable pressure relief valve is judged to have met the burst test requirements. After the test, the pressure reducing device automatically starts, and then the gas regulating valve is closed. The side door of the environmental test chamber can be opened, and the upper pressure plate 3 can be removed to remove the tested circular breathable pressure relief valve. The breathable pressure relief valve to be tested is reinstalled and the test is carried out according to the same steps.

[0036] When conducting high and low temperature experiments, the environmental test chamber is cooled or heated to a certain required temperature. Optionally, under ambient temperature conditions below 60°C, the test is performed to determine the anti-burst performance of the breathable pressure relief valve by ensuring that it does not rupture under certain pressure shock conditions. Optionally, when the ambient temperature is above 60°C, the burst pressure can be gradually and slowly increased until the functional sealing membrane of the breathable pressure relief valve is broken. The pressure at this time is the anti-burst pressure of the breathable pressure relief valve under the set ambient temperature conditions. The higher the ambient temperature, the lower the anti-burst pressure. It should be noted that when testing a square breathable pressure relief valve, the test steps are the same as above and will not be repeated here.

[0037] In summary, through the above technical solution, the test device of the present application is simple, convenient and fast to operate. No laser welding is required, etc., and the test cost and time are greatly reduced.

[0038] Optionally, multiple sealing sheets are provided in the multiple embedding cavities, and at least one of the sealing sheets includes a perforated sealing sheet. In this embodiment, the embedding cavities include two. The perforated sealing sheet is installed in the embedding cavity where the sample 6 to be tested is located. The perforated sealing sheet is placed in the embedding cavity to be tested, while the non-perforated sealing sheet is placed in the other embedding cavity. Furthermore, the sealing sheet can be made of silicone rubber.

[0039] Optionally, the sealing sheet includes a circular sealing sheet 901 and a square sealing sheet 902, and the opening 10 is opened at the center of the hole-containing sealing sheet. The diameter of the opening 10 is larger than the diameter of the sink 11 of the sample 6 to be tested. Figure 4-Figure 5 The shape of the sealing sheet is adapted to the shape of the corresponding sample 6 to be tested.

[0040] Optionally, the size of the sealing sheet is larger than the size of the through hole 1 4 , so that the sealing sheet can be fixed in the through hole 1 4 , so as to facilitate subsequent testing.

[0041] Optionally, the air inlet includes an air inlet 1 701 for compressed gas to enter and an air inlet 2 702 for high-pressure gas to enter;

[0042] Among them, the pressure of compressed gas can reach 0.7Mpa, and the pressure of high-pressure gas can reach 1.5Mpa.

[0043] Different air inlets can be selected for air intake testing according to actual conditions. When one of the air inlets is used, the other air inlet is in a closed state.

[0044] Optionally, a plurality of sealing rings are provided on the end surface of the clamp 2 in contact with the base 1, and the high-pressure gas chamber is located inside the sealing ring; wherein, the sealing ring includes a sealing inner ring 12 and a sealing outer ring 13, and the high-pressure gas chamber can be sealed by the sealing ring to avoid air leakage.

[0045] In some possible embodiments:

[0046] Round breathable pressure relief valve Alvent Φ21.0*1.0-PP Φ17.0*0.15 Normal temperature burst test: 0.7Mpa condition for 30S without rupture

[0047] The dimensions of the circular sealing sheet 901 are: diameter Φ18.5 mm, diameter of the through hole 10-1 Φ12.0 mm, thickness 2.0 mm, and the material is silicone rubber.

[0048] The dimensions of the square sealing sheet 902 are: 33 mm long and 16 mm wide, without any through holes, 2.0 mm thick, and made of silicone rubber.

[0049] Lock and secure the base 1 in the environmental test chamber, then secure and lock the fixture 2 to the base 1 using the positioning pins. Then, insert the circular sealing sheet 901 into the embedding cavity, and then insert the circular air and pressure relief valve Alvent Φ21.0*1.0-PP Φ17.0*0.15 to be tested into the embedding cavity.

[0050] Insert the square sealing sheet 902 into the corresponding area of ​​the other embedding cavity, and then insert the square air-permeable pressure relief valve Alvent 37.0*20.0*1.0-PP 31.0*14.0*1.0 into the other embedding cavity. Install the upper pressing plate 3 and lock it.

[0051] Turn on the power switch, close the side door of the environmental test chamber, adjust the pressure to 0.7 MPa, and maintain it for more than 30 seconds. Observe that the pressure continues to remain at 0.7 MPa and there is no "squeaking" sound of air leakage in the environmental test chamber.

[0052] After the test, the pressure relief solenoid valve automatically starts, then the pressure regulating valve is closed, the side door of the environmental test chamber is opened, the upper pressure plate 3 is removed, and the circular air-permeable pressure relief valve after the test is removed; other parallel samples can also be replaced to continue the test.

[0053] In some other possible embodiments:

[0054] Explosion test of circular air relief valve Alvent Φ21.0*1.0-PP Φ17.0*0.15 at -40℃:

[0055] 0.7Mpa condition lasts for 30S without breaking;

[0056] The dimensions of the circular sealing sheet 901 are: diameter Φ18.5 mm, diameter of the through hole 10-1 Φ12.0 mm, thickness 2.0 mm, and the material is silicone rubber.

[0057] The dimensions of the square sealing sheet 902 are: 33 mm long and 16 mm wide, without any through holes, 2.0 mm thick, and made of silicone rubber.

[0058] Lock and secure base 1 in the environmental test chamber, then secure and lock fixture 2 to base 1 using the positioning pins. Open the environmental test chamber, adjust the temperature to -40°C, and close the side door until the temperature remains at -40°C.

[0059] When the temperature of the environmental test chamber is maintained at -40℃, open the side door and insert the circular sealing piece 901 into the embedding cavity, and then insert the circular air-permeable pressure relief valve Al vent Φ21.0*1.0-PPΦ

[0060] 17.0*0.15 is embedded in the embedding cavity.

[0061] Insert the square sealing sheet 902 into the corresponding area, and then insert the square air-vent pressure relief valve Al vent 37.0*20.0*1.0-PP 31.0*14.0*1.0 into the other embedding cavity. Install the upper pressing plate 3 and lock it.

[0062] Turn on the power switch, close the side door of the environmental test chamber, and wait until the ambient temperature remains at -40°C. Then adjust the pressure to 0.7 MPa and maintain it for more than 30 seconds. Observe that the pressure remains at 0.7 MPa and there is no "squeaking" sound of air leakage in the environmental test chamber.

[0063] After the test, the pressure relief solenoid valve automatically starts, then the pressure regulating valve is closed, the side door of the environmental test chamber is opened, the upper pressure plate 3 is removed, and the circular air-permeable pressure relief valve after the test is removed; other parallel samples can also be replaced to continue the test.

[0064] In some other possible embodiments:

[0065] Explosion resistance test of circular air relief valve AlventΦ21.0*1.0-PPΦ17.0*0.15 at 60℃:

[0066] The dimensions of the circular sealing sheet 901 are: diameter Φ18.5 mm, diameter of the through hole 10-1 Φ12.0 mm, thickness 2.0 mm, and the material is silicone rubber.

[0067] The dimensions of the square sealing sheet 902 are: 33 mm long and 16 mm wide, without any through holes, 2.0 mm thick, and made of silicone rubber.

[0068] Lock and secure the base 1 in the environmental test chamber, and then secure and lock the fixture 2 to the base 1 using the positioning pins. Open the environmental test chamber, adjust the temperature of the environmental test chamber to 60°C, and close the side door of the environmental test chamber until the temperature remains at 60°C.

[0069] When the temperature of the environmental test chamber is maintained at 60℃, open the side door and insert the circular sealing piece 901 into the embedding cavity, and then insert the circular air-permeable pressure relief valve Al vent Φ21.0*1.0-PPΦ

[0070] 17.0*0.15 is embedded in the embedding cavity.

[0071] Insert the square sealing sheet 902 into the corresponding area of ​​the other embedding cavity, and then insert the square air-permeable pressure relief valve Alvent 37.0*20.0*1.0-PP 31.0*14.0*1.0 into the other embedding cavity. Install the upper pressing plate 3 and lock it.

[0072] Turn on the power switch, close the side door of the environmental test chamber, wait until the ambient temperature remains at 60°C, then slowly adjust the pressure to make the pressure rise slowly and gradually; when the test pressure is 0.3Mpa, the environmental test chamber will have a "squeaking" sound of air leakage, and the pressure will drop significantly instantly.

[0073] After the test, close the pressure regulating valve, open the side door of the environmental test chamber, remove the upper pressure plate 31, and remove the tested circular air-permeable pressure relief valve. Alternatively, replace it with another parallel sample and continue testing. The burst pressures of the other circular air-permeable pressure relief valves at 60°C are: 0.7 MPa, 0.7 MPa, 0.68 MPa, 0.7 MPa, 0.66 MPa, 0.68 MPa, and 0.7 MPa.

[0074] The above description of the disclosed embodiments will enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A burst strength test tool for a vent pressure relief valve, used in an environmental test chamber, characterized in that: include: base; A clamp is fixed on the base, and an upper pressing plate is fixed on the upper surface of the clamp; The fixture is provided with a plurality of through holes 1, the upper pressing plate is provided with through holes 2 that match the positions of the through holes 1, and the through holes 1 are provided with a pressure relief valve embedding cavity, and the embedding cavity is used to install the sample to be tested; The base is provided with a plurality of air inlets and an air outlet, and the air inlets and the air outlet are both connected to a high-pressure gas chamber provided in the base, and the high-pressure gas chamber is communicated with the through hole 1 and the through hole 2.

2. The burst strength testing tool for a vent pressure relief valve according to claim 1, characterized in that: A plurality of sealing sheets are provided in the plurality of embedding cavities, and the plurality of sealing sheets include at least one sealing sheet containing a hole, and the sealing sheet containing a hole is installed in the embedding cavity where the sample to be tested is located.

3. The burst strength testing tool for a vent pressure relief valve according to claim 2, characterized in that: The sealing sheet includes a circular sealing sheet and a square sealing sheet. The opening is opened at the center of the sealing sheet containing the hole. The diameter of the opening is larger than the diameter of the sink of the sample to be tested.

4. The burst strength testing tool for a vent pressure relief valve according to claim 2, characterized in that: The size of the sealing sheet is larger than the size of the first through hole.

5. The burst strength testing tool for a vent pressure relief valve according to claim 1, characterized in that: The air inlet includes an air inlet 1 for compressed gas to enter and an air inlet 2 for high-pressure gas to enter; Among them, the pressure of compressed gas is 0.7Mpa, and the pressure of high-pressure gas is 1.5Mpa.

6. The burst strength testing tool for a vent pressure relief valve according to claim 1, characterized in that: A plurality of sealing rings are provided on the end surface of the second clamp in contact with the base, and the high-pressure gas chamber is located inside the sealing rings.

7. The burst strength testing tool for a vent pressure relief valve according to claim 6, characterized in that: The sealing ring includes a sealing inner ring and a sealing outer ring.

8. The burst strength testing tool for a vent pressure relief valve according to claim 1, characterized in that: The upper pressing plate and the clamp are positioned and locked by positioning pins, and the clamp and the base are positioned and locked by positioning pins.

9. The burst strength testing tool for a vent pressure relief valve according to claim 5, characterized in that: The first air inlet, the second air inlet and the air outlet are all vertically arranged at the center of the base and pass through the base.

10. The burst strength testing tool for a vent pressure relief valve according to claim 2, characterized in that: The sealing sheet is made of silicone rubber.

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