Simulation device for testing explosion-proof valve in thermal runaway state of automobile battery pack

Abstract

The utility model belongs to the technical field of automobile battery testing, and particularly relates to a simulation device for testing an explosion-proof valve in a thermal runaway state of an automobile battery pack. The simulation device is used for testing an explosion-proof valve (6) and comprises a test cabin (1), a dust raising assembly, a cover cap (5) and a leakage test bench (9). An opening is formed in the side wall of the testing cabin (1) and used for containing the anti-explosion valve (6), the dust raising assembly is arranged at the bottom of the testing cabin (1), a cover cap (5) is arranged outside the anti-explosion valve (6), and the leakage testing table (9) penetrates through the cover cap (5) and is connected with a closed cavity between the cover cap (5) and the anti-explosion valve (6). Compared with the prior art, the thermal runaway test device can effectively simulate the working condition at the initial stage of thermal runaway of the automobile battery pack aiming at the explosion-proof valve test, can effectively test the working conditions of the explosion-proof valve under different conditions, can freely adjust the test conditions according to the actual conditions, and is high in universality, simple in structure and high in technical feasibility.

Description

Technical Field

[0001] The utility model belongs to the technical field of automotive battery testing, and particularly relates to a simulation device for testing an explosion-proof valve in the thermal runaway state of an automotive battery pack. Background Art

[0002] In recent years, new energy vehicles have developed rapidly. When the internal temperature or pressure of a new energy vehicle battery is too high, chemical reactions will occur inside the battery, and then gas with particulate matter will be generated, causing the internal pressure of the battery to continuously increase, resulting in too high internal pressure of the battery, thereby damaging the battery, and in more serious cases, causing the battery to explode.

[0003] To protect the battery pack and balance the internal and external pressures, the explosion-proof valve plays a key role. In a series of tests on the explosion-proof valve, the current focus is on whether the explosion-proof valve can play the role of exhausting gas and preventing explosion at the initial stage of thermal runaway of the battery pack, and at the same time blocking the ejection of harmful particulate matter inside the battery pack. In view of this situation, there is a related need to be able to quickly and simply simulate the environment at the initial stage of thermal runaway to detect the important parameters and performance of the explosion-proof valve at the initial stage of thermal runaway.

[0004] Patent CN106969980B discloses a battery explosion-proof valve test system, which tests the pressure relief amount of the explosion-proof valve by simulating the explosion phenomenon of the battery pack. Patent CN221527968U discloses an explosion-proof valve test device, which tests the explosion-proof pressure value and safety level of the explosion-proof valve under a constant impact pressure. However, the current patents do not simulate the environment of the thermal runaway state of the automotive battery pack, especially the combined simulation of dust and pressure.

[0005] Currently, when testing the explosion-proof valve for thermal runaway, simulating the real scenario is costly, difficult to repeat, and has a long time cycle. Therefore, it has become urgent to design a fast, simple and low-cost test device that can simulate the test environment of the explosion-proof valve during thermal runaway. Summary of the Utility Model

[0006] The purpose of the utility model is to provide a simulation device for testing an explosion-proof valve in the thermal runaway state of an automotive battery pack to solve at least one of the above problems, so as to solve the problems that when testing the explosion-proof valve for thermal runaway in the prior art, simulating the real scenario is costly, difficult to repeat, and has a long time cycle, and realizes quickly and simply simulating the environment at the initial stage of thermal runaway of the automotive battery pack to detect the working condition of the explosion-proof valve.

[0007] The purpose of the utility model is achieved through the following technical solutions:

[0008] The technical solution of the utility model lies in proposing a simulation device for testing an explosion-proof valve in the thermal runaway state of an automotive battery pack. The simulation device is used to test the explosion-proof valve and includes:

[0009] Test chamber, dust generation component, cover and leakage test bench;

[0010] An opening is provided on the side wall of the test chamber for placing an explosion-proof valve. The dust generation component is arranged at the bottom of the test chamber. A cover is arranged outside the explosion-proof valve, and the leakage test bench passes through the cover and is connected to the sealed cavity between the cover and the explosion-proof valve.

[0011] Furthermore, the test chamber is a transparent cubic box.

[0012] Furthermore, the dust generation component includes a compressed air source interface, an air inlet pipe and a dust generation pipe. The air inlet of the air inlet pipe is connected to the compressed air source interface, and the air outlet is connected to the dust generation pipe.

[0013] Furthermore, the air inlet of the air inlet pipe extends out through a small hole at the top of the test chamber and is connected to the compressed air source interface.

[0014] Furthermore, the dust generation pipe is laid along the bottom of the test chamber, the pipes are connected to each other, and a plurality of air blowing holes are arranged on the pipe wall.

[0015] Furthermore, the dust generation pipe is laid circumferentially along the bottom of the test chamber.

[0016] Even further, a circumferential dust generation pipe is laid circumferentially along the bottom of the test chamber, and a plurality of air blowing holes are arranged on the pipe wall.

[0017] Furthermore, the dust generation pipe is laid along the length direction or the width direction of the bottom of the test chamber.

[0018] Even further, a cross-shaped dust generation pipe is laid along the length direction and the width direction of the bottom of the test chamber, and a plurality of air blowing holes are arranged on the pipe wall.

[0019] Furthermore, the compressed air source interface is used to introduce air into the air inlet pipe. The air inlet pipe transmits the input air flow to the cross-shaped dust generation pipe and the circumferential dust generation pipe, and blows out from the air blowing holes of the dust generation pipe. Adjusting the compressed air pressure of the compressed air source interface can adjust the air flow blown out from the air blowing holes, and further adjust the dust diffusion effect in the test chamber.

[0020] Furthermore, the connection method between the explosion-proof valve and the side wall of the test chamber includes any one of threaded connection and bonding.

[0021] Furthermore, the connection method between the cover and the outer surface of the test chamber includes any one of threaded connection and bonding.

[0022] Furthermore, the contact position between the cover and the outer surface of the test chamber is sealed.

[0023] Furthermore, a quick plug connector is reserved on the cover, and the leakage test bench is connected to the quick plug connector arranged on the cover.

[0024] Further, the leakage test bench simulates the high-pressure gas discharged during the thermal runaway of the battery pack by extracting the negative pressure of the workpiece, enabling the dust in the test chamber to enter the diaphragm of the explosion-proof valve, effectively simulating the working conditions of the battery pack at the initial stage of thermal runaway. The required test pressure requirements are set, and the changes in the flow rate and pressure of the workpiece can be read and recorded in real time, thereby determining whether the performance of the explosion-proof valve during thermal runaway can meet the design requirements.

[0025] Further, an exhaust port covered with an exhaust film is provided on the top of the test chamber. During the test, the exhaust port plays a role in balancing the pressure inside and outside the test chamber, and can isolate the overflow of dust while allowing air to pass through.

[0026] Further, the exhaust port can pass air but not dust.

[0027] Further, the material of the exhaust film is non-woven fabric.

[0028] Further, a particulate concentration detector is provided inside the test chamber to detect the dust concentration.

[0029] Further, the top cover of the test chamber can be opened, and the dust is placed at the bottom of the test chamber before the test.

[0030] Further, before the test, the mass of the dust to be placed can be determined according to the dust concentration required by the test parameters and the size of the test chamber.

[0031] Compared with the prior art, the present utility model has the following advantages:

[0032] 1. This device can effectively simulate the working conditions of the automotive battery pack at the initial stage of thermal runaway for the explosion-proof valve test, can effectively test the working conditions of the explosion-proof valve under different conditions, and there is no need to approach the test environment, with a high safety factor.

[0033] 2. This device cooperates with the compressed air source through the dust pipe, can freely control the dust concentration in the test chamber, can adjust the suction pressure through the leakage test bench, and can freely adjust the test conditions according to the actual situation, with high versatility.

[0034] 3. The experimental devices used in this device can all be purchased on the market, with low costs, easy to expand production, and easy to implement.

[0035] 4. This device has a simple structure, simple logic, low assembly difficulty, convenient and fast setup, and high technical feasibility. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a schematic structural diagram of the test device of the present utility model;

[0037] Figure 2 It is a schematic diagram of a leakage test bench;

[0038] In the figure: 1 - test chamber; 2 - exhaust port; 3 - compressed air source interface; 4 - intake pipe; 5 - cover; 6 - explosion-proof valve; 7 - cross dust-raising pipe; 8 - circumferential dust-raising pipe; 9 - leakage test bench; P - compressed air intake; P1 - compressed air exhaust; Q - leakage test bench air extraction. Specific implementation manners

[0039] The following combines the accompanying drawings and specific embodiments to elaborate on the present utility model in detail. This embodiment is implemented on the premise of the technical solution of the present utility model, and gives the detailed implementation manners and specific operation procedures, but the protection scope of the present utility model is not limited to the following embodiments.

[0040] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "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 therefore cannot be understood as a limitation to the present utility model. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0041] In the description of the present utility model, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", "connection" 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 directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0042] In the following embodiments or examples, if there is no specifically described functional component or structure, it means that they are all conventional components or conventional structures adopted in the art to achieve the corresponding functions.

[0043] The test instruments and test methods described in this embodiment are all conventional test methods in the art.

[0044] The brand and model of the leakage test bench used in the following examples are the leakage test bench produced by TetraTec Instruments GmbH.

[0045] See Figure 1As shown in the figure, the present utility model proposes a simulation device for testing an explosion-proof valve in the thermal runaway state of an automotive battery pack. The simulation device is used to test the explosion-proof valve 6 and includes:

[0046] A test chamber 1, an exhaust port 2, a dust-raising component, a cover 5, and a leakage test bench 9;

[0047] An exhaust port 2 covered with an exhaust film is provided on the top of the test chamber 1. An opening is provided on the side wall of the test chamber 1 for placing the explosion-proof valve 6. The dust-raising component is arranged at the bottom of the test chamber 1. A cover 5 is arranged outside the explosion-proof valve 6. The leakage test bench 9 passes through the cover 5 and is connected to the sealed cavity between the cover 5 and the explosion-proof valve 6;

[0048] The dust-raising component includes a compressed air source interface 3, an air inlet pipe 4, and a dust-raising pipe. The air inlet of the air inlet pipe 4 is connected to the compressed air source interface 3, and the air outlet is connected to the dust-raising pipe; the dust-raising pipe is laid along the bottom of the test chamber 1, and the pipes are connected to each other. A plurality of air blowing holes are provided at the top of the pipe wall; the air inlet of the air inlet pipe 4 extends out through a small hole at the top of the test chamber 1 and is connected to the compressed air source interface 3.

[0049] The test chamber 2 is a transparent cubic box.

[0050] The dust-raising pipe is laid along the bottom of the test chamber 1, and the pipes are connected to each other. A plurality of air blowing holes are provided on the pipe wall. Specifically:

[0051] The circumferential dust-raising pipe 8 is laid along the circumference of the bottom of the test chamber 1, and the cross-shaped dust-raising pipe 7 is laid along the length and width directions of the bottom of the test chamber 1. A plurality of air blowing holes are provided on the pipe walls of the circumferential dust-raising pipe 8 and the cross-shaped dust-raising pipe 7.

[0052] The compressed air source interface 3 is used to introduce air into the air inlet pipe 4. The air inlet pipe 4 transmits the input air flow to the cross-shaped dust-raising pipe 7 and the circumferential dust-raising pipe 8, and blows out from the air blowing holes of the dust-raising pipe. Adjusting the compressed air pressure of the compressed air source interface 3 can adjust the air flow blown out from the air blowing holes, and further adjust the dust diffusion effect in the test chamber 1.

[0053] The connection method between the explosion-proof valve 6 and the side wall of the test chamber 1 includes any one of threaded connection and bonding.

[0054] The connection method between the cover 5 and the outer surface of the test chamber 1 includes any one of threaded connection and bonding.

[0055] The contact position between the cover 5 and the outer surface of the test chamber 1 is sealed. A quick connector is reserved on the cover 5, and the leakage test bench 9 is connected to the quick connector provided on the cover 5.

[0056] The leakage test bench 9 simulates the high-pressure gas discharged during the thermal runaway of the battery pack by extracting the negative pressure of the workpiece, enabling the dust in the test chamber 1 to enter the diaphragm of the explosion-proof valve 6, effectively simulating the working conditions of the battery pack at the initial stage of thermal runaway. By setting the required test pressure and simultaneously reading and recording the changes in the flow rate and pressure of the workpiece in real time, it can be determined whether the performance of the explosion-proof valve 6 during thermal runaway meets the design requirements.

[0057] The exhaust port 2 allows air to pass through but not dust. The exhaust port 2 plays a role in balancing the pressure inside and outside the test chamber 1, and while allowing air to pass through, it can also prevent the spillage of dust. The exhaust membrane is made of non-woven fabric.

[0058] A particulate matter concentration detector is installed inside the test chamber 1 to detect the dust concentration.

[0059] The top cover of the test chamber 1 can be opened. Before the test, the dust is placed at the bottom of the test chamber 1. Before the test, the mass of the dust to be placed can be determined according to the dust concentration required by the test parameters and the size of the test chamber 1.

[0060] Embodiment 1

[0061] See Figure 1 As shown, the present utility model provides a simulation device for testing an explosion-proof valve under the thermal runaway state of an automotive battery pack. The simulation device is used to test the explosion-proof valve 6 and includes:

[0062] A test chamber 1, an exhaust port 2, a dust-raising assembly, a cover 5, and a leakage test bench 9;

[0063] An exhaust port 2 covered with an exhaust membrane is provided on the top of the test chamber 1. An opening is provided on the side wall of the test chamber 1 for placing the explosion-proof valve 6. The dust-raising assembly is arranged at the bottom of the test chamber 1. A cover 5 is arranged outside the explosion-proof valve 6. The leakage test bench 9 passes through the cover 5 and is connected to the sealed cavity between the cover 5 and the explosion-proof valve 6;

[0064] The dust-raising assembly includes a compressed air source interface 3, an air inlet pipe 4, and a dust-raising pipe. The air inlet of the air inlet pipe 4 is connected to the compressed air source interface 3, and the air outlet is connected to the dust-raising pipe; the dust-raising pipe is laid along the bottom of the test chamber 1, and the pipes are connected to each other. Multiple air blowing holes are provided on the top of the pipe wall; the air inlet of the air inlet pipe 4 extends out through a small hole on the top of the test chamber 1 and is connected to the compressed air source interface 3.

[0065] The test chamber 2 is a transparent cube box with a length, width, and height of 30 cm each.

[0066] The dust-raising pipe is laid along the bottom of the test chamber 1, and the pipes are connected to each other. Multiple air blowing holes are provided on the pipe wall. Specifically:

[0067] The circumferential dust blowing pipe 8 is laid along the circumference of the bottom of the test chamber 1, and the cross-shaped dust blowing pipe 7 is laid along the length and width directions of the bottom of the test chamber 1. A plurality of air blowing holes are provided on the pipe walls of the circumferential dust blowing pipe 8 and the cross-shaped dust blowing pipe 7.

[0068] The compressed air source interface 3 is used to introduce air into the air inlet pipe 4. The air inlet pipe 4 transmits the input air flow to the cross-shaped dust blowing pipe 7 and the circumferential dust blowing pipe 8, and blows it out from the air blowing holes of the dust blowing pipes. Adjusting the compressed air pressure of the compressed air source interface 3 can adjust the air flow blown out from the air blowing holes, and further adjust the dust diffusion effect in the test chamber 1.

[0069] The explosion-proof valve 6 is connected to the side wall of the test chamber 1 by means of screw connection.

[0070] The cover 5 is connected to the outer surface of the test chamber 1 by means of screw connection.

[0071] The contact position between the cover 5 and the outer surface of the test chamber 1 is sealed. The cover 5 is provided with a quick connector, and the leakage test bench 9 is connected to the quick connector provided on the cover 5.

[0072] The leakage test bench 9 simulates the high-pressure gas discharged during the thermal runaway of the battery pack by extracting the negative pressure of the workpiece, so that the dust in the test chamber 1 can enter the diaphragm of the explosion-proof valve 6, effectively simulating the working conditions at the initial stage of the thermal runaway of the battery pack. By setting the required test pressure requirements, the changes in the flow rate and pressure of the workpiece can be read and recorded in real time, and thus it can be judged whether the performance of the explosion-proof valve 6 during thermal runaway can meet the design requirements.

[0073] The exhaust port 2 can pass air but cannot pass dust. The exhaust port 2 plays a role in balancing the internal and external pressures of the test chamber 1, and can isolate the overflow of dust while being breathable. The exhaust membrane is made of non-woven fabric.

[0074] A particulate matter concentration detector is arranged inside the test chamber 1 to detect the dust concentration.

[0075] The upper cover of the top of the test chamber 1 can be opened. Before the test, the dust is placed at the bottom of the test chamber 1. Before the test, the mass of the dust to be put in can be determined according to the dust concentration required by the test parameters and the size of the test chamber 1.

[0076] In this embodiment, the test chamber 1 uses ISO 12103-A4 coarse test dust as the dust blowing material, and the dust blowing concentration is set to 200 g / m 3 , and the simulation is carried out under two thermal runaway conditions. The two thermal runaway conditions are respectively:

[0077] (1) -10 kPa impact for 10 min

[0078] (2) -15 kPa impact for 8 min

[0079] Please refer to again Figure 1 As shown, during the test, first assemble the explosion-proof valve 6 to the side wall of the test chamber 1, and then install the cover 5 in the area outside the side wall of the test chamber 1 where the explosion-proof valve 6 is installed. The contact area between the cover 5 and the test chamber 1 is larger than the area of the explosion-proof valve 6, and the gap between the cover 5 and the test chamber 1 is sealed with sealant. Open the top cover of the test chamber 1, add A4 test dust according to the set dust concentration, connect the quick connector of the cover 5 to the leakage test bench 9 with an 8mm air pipe, and introduce compressed air P from the compressed air source interface 3. The compressed air P passes through the intake pipe and the dust-raising pipe, and is blown out from the air holes of the cross dust-raising pipe 7 and the circumferential dust-raising pipe 8 at the center and periphery of the bottom of the test chamber 1. After raising the dust, the gas P1 in the test chamber 1 is discharged through the exhaust port 2 to balance the atmospheric pressure inside and outside the test chamber 1. Wait until the A4 dust in the test chamber 1 floats to reach the required concentration of 200g / m 3 , open the leakage test bench 9 to extract negative pressure (-10kPa / -15kPa) so that the dust raised in the test chamber 1 can enter the diaphragm of the explosion-proof valve 6, thereby effectively simulating the working conditions of the battery pack at the initial stage of thermal runaway. The air permeability flow rate of the explosion-proof valve 6 during thermal runaway can be monitored in real time on the leakage test bench 9, and thus it can be judged whether the performance of the explosion-proof valve 6 during thermal runaway can meet the design requirements.

[0080] The above description of the embodiments is for the convenience of those of ordinary skill in the art to understand and use the utility model. It is obvious that those skilled in the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative labor. Therefore, the present utility model is not limited to the above embodiments, and the improvements and modifications made by those skilled in the art without departing from the scope of the present utility model according to the disclosure of the present utility model should be within the protection scope of the present utility model.

Claims

1. A simulation device for testing an explosion-proof valve in the thermal runaway state of an automotive battery pack, characterized in that, The simulation device is used to test the explosion-proof valve (6) and includes: a test chamber (1), a dust-raising component, a cover (5), and a leakage test bench (9); an opening is provided on the side wall of the test chamber (1) for placing the explosion-proof valve (6), the dust-raising component is arranged at the bottom of the test chamber (1), a cover (5) is arranged outside the explosion-proof valve (6), and the leakage test bench (9) passes through the cover (5) and is connected to the sealed cavity between the cover (5) and the explosion-proof valve (6).

2. The simulation device for testing the explosion-proof valve in the thermal runaway state of an automotive battery pack according to claim 1, wherein, The dust-raising component includes a compressed air source interface (3), an air inlet pipe (4), and a dust-raising pipe. The air inlet of the air inlet pipe (4) is connected to the compressed air source interface (3), and the air outlet is connected to the dust-raising pipe.

3. The simulation device for testing an explosion-proof valve in the thermal runaway state of an automotive battery pack according to claim 2, characterized in that The dust-raising pipe is laid along the bottom of the test chamber (1), the pipes are connected to each other, and a plurality of air blowing holes are provided on the pipe wall.

4. The simulation device for testing the explosion-proof valve in the thermal runaway state of an automotive battery pack according to claim 3, characterized in that The dust-raising pipe is laid circumferentially along the bottom of the test chamber (1).

5. The simulation device for testing the explosion-proof valve in the thermal runaway state of an automotive battery pack according to claim 3, characterized in that, The dust-raising pipe is laid along the length direction or the width direction of the bottom of the test chamber (1).

6. The simulation device for testing the explosion-proof valve under the thermal runaway state of an automotive battery pack according to claim 1, characterized in that, The connection method between the explosion-proof valve (6) and the side wall of the test chamber (1) includes any one of threaded connection and bonding.

7. The simulation device for testing the explosion-proof valve under the thermal runaway state of an automotive battery pack according to claim 1, wherein The connection method between the cover (5) and the outer surface of the test chamber (1) includes any one of threaded connection and bonding.

8. An analog device for testing an explosion-proof valve in a thermal runaway state of an automotive battery pack according to claim 1, characterized in that, The leakage test bench (9) is connected to a quick connector provided on the cover (5).

9. The simulation device for testing the explosion-proof valve under the thermal runaway state of an automotive battery pack according to claim 1, wherein, An exhaust port (2) covered with an exhaust film is provided on the top of the test chamber (1).

10. The simulation device for testing an explosion-proof valve in a thermal runaway state of an automotive battery pack according to claim 1, wherein, A particulate matter concentration detector is arranged inside the test chamber (1).

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