Test device for comprehensive test of thermal runaway of lithium ion storage battery

Abstract

The utility model discloses a test device for a thermal runaway comprehensive test of a lithium ion storage battery. The battery safety test device comprises a test tank, and a test platform used for placing a battery is horizontally arranged in the test tank. The lithium battery thermal runaway test device comprises a test tank, the test tank is provided with a gas inlet, the gas inlet is communicated with a gas distribution system, and the gas distribution system is used for filling the test tank with gas. Meanwhile, the thermal runaway condition caused by acupuncture can be simulated; the coupling effect of the explosive environment is comprehensively considered, and the safety test of the lithium battery can be more comprehensively carried out.

Description

Technical Field

[0001] The utility model relates to the field of battery safety tests, and in particular to a comprehensive test device for thermal runaway of lithium-ion batteries. Background Art

[0002] With the green development of industrial explosion-prone fields such as mines, petrochemicals, etc., the application of lithium-ion battery power sources in explosive environments is becoming more and more extensive. In order to explore the degradation characteristics of the whole life cycle of battery cells, the lithium battery thermal runaway test platform has been continuously developed, and its functions have gradually become diversified.

[0003] At present, the lithium battery thermal runaway test platform mostly involves civil vehicles, household appliances, etc., without considering the coupling situation of explosive environments such as mines, petrochemicals, etc. However, with the continuous application of lithium-ion battery power sources in explosion-prone places, the lithium battery thermal runaway test platform only considers the thermal runaway triggering mechanism of lithium-ion batteries, while ignoring the coupling effect of explosive environments (such as methane, hydrogen, etc.), which is obviously not comprehensive enough. Content of the Utility Model

[0004] In order to conduct safety tests on batteries under the coupling action of different environments, the present application provides a comprehensive test device for thermal runaway of lithium-ion batteries.

[0005] The present application provides a comprehensive test device for thermal runaway of lithium-ion batteries, adopting the following technical solutions:

[0006] A comprehensive test device for thermal runaway of lithium-ion batteries includes a test tank, in which a test platform for placing batteries is horizontally arranged; an air inlet is opened on the test tank, and the air inlet is communicated with a gas distribution system, and the gas distribution system is used to fill the test tank with gas.

[0007] Further, the gas distribution system includes a plurality of tanks, which are respectively filled with hydrogen, methane tank, ethylene, acetylene and air.

[0008] Further, valves are provided on each of the plurality of tanks, and the plurality of tanks are all connected to a main valve through branch gas paths, and the main valve is connected to the air inlet through a main gas path.

[0009] Further, a stabbing needle is slidably connected in the test tank in the vertical direction, and a through hole for the stabbing needle to slide through is opened on the test platform; the stabbing needle slides to pierce or disengage from the battery; a driving component for driving the stabbing needle to slide is also provided in the test tank.

[0010] Further, a mounting seat is provided in the test tank, and a stabbing rod is threadedly penetrated in the vertical direction on the mounting seat, and the stabbing needle is fixedly connected to the stabbing rod.

[0011] Further, the driving assembly includes a worm gear, a worm, and a motor. The motor is fixedly arranged in the test tank, and the output shaft of the motor is arranged horizontally; the worm is fixedly connected to the output shaft of the motor, the worm gear is rotatably connected to the mounting seat, the rotation axis of the worm gear is arranged vertically, and the worm gear meshes with the worm; the stabbing rod is a telescopic rod, the stabbing rod includes a threaded portion and a fixed portion, and the threaded portion is slidably connected to the fixed portion; the threaded portion is threadedly penetrated through the mounting seat, and the fixed portion is coaxially and fixedly connected to the worm gear.

[0012] Further, the test tank includes a tank body and a top cover. The top cover is rotatably connected to the tank body, and the top cover and the tank body are buckled to form the tank body.

[0013] Further, the tank body is provided with a wire inlet hole for the motor cable to enter and a wire threading hole for the battery cable to enter; sealing rings are arranged at both the wire threading hole and the wire inlet hole.

[0014] In summary, the present application includes the following beneficial technical effects:

[0015] Through the setting of the gas distribution system and the stab needle, the test device of the present application can simulate the thermal runaway situation of lithium batteries in different gas environments, and at the same time can also simulate the thermal runaway situation caused by stabbing; comprehensively considering the coupling effect of the explosive environment, it can conduct more comprehensive safety tests on lithium batteries. Description of the Drawings

[0016] Figure 1 is the overall structure diagram of a test device for comprehensive thermal runaway testing of lithium-ion batteries according to the present application;

[0017] Figure 2 is Figure 1 the overall structure diagram of the stab needle and its driving assembly in

[0018] Description of the Reference Numerals:

[0019] 1. Test tank; 11. Top cover; 111. Manual valve; 112. Pressure relief valve; 12. Tank body; 121. Wire threading hole; 122. Wire inlet hole; 2. Experimental platform; 21. Through hole; 3. Gas distribution system; 31. Gas tank; 32. Valve; 33. Branch gas path; 34. Main valve; 35. Main gas path; 41. Stab needle; 42. Stabbing rod; 421. Fixed portion; 422. Threaded portion; 43. Mounting seat; 44. Worm gear; 45. Worm; 46. Motor; 47. Bearing seat. Detailed Description of the Embodiment

[0020] The following further describes the present application in detail Figure 1-2 with reference to the attached

[0021] The embodiment of the present application discloses a comprehensive test device for thermal runaway of lithium-ion batteries, the device comprising a test tank 1, the test tank 1 comprising a tank body 12 and a top cover 11, the top cover 11 is rotatably connected to the tank body 12, a test platform for placing lithium batteries is provided in the tank body 12, an air inlet is provided on the test tank 1, the air inlet is connected to a gas distribution system 3; the gas distribution system 3 is used to fill various gases into the test tank 1, in the embodiment of the present application, the various gases are specifically hydrogen, methane, ethylene, acetylene and air; at the same time, the tank body 12 is provided with a gas inlet, the gas ... There is an entry hole 122 for the cable connected to the battery to enter; before the experiment, explosive gas is introduced into the test tank 1 through the gas distribution system 3, and then the thermal runaway of the battery is artificially caused through the heating module or the charging and discharging module, so as to conduct a safety test on the battery; considering the sealing performance, a sealing strip is embedded in the tank body 12, which can effectively ensure the sealing performance of the tank body 12; at the same time, a pressure relief valve 112 and a manual valve 111 are provided on the top cover 11, the pressure relief valve 112 is used to ensure safety, and the manual valve 111 can provide a channel for subsequent gas composition analysis.

[0022] In the embodiment of the present application, the gas distribution system 3 is specifically five gas tanks 31, and the five gas tanks 31 are respectively filled with hydrogen, methane, ethylene, acetylene and air; branch valves 32 are provided on the gas tanks 31, and then the five branch valves 32 are connected to the main valve 34 through the branch gas path 33; the main valve 34 is then connected to the air inlet through the main gas path 35; when it is necessary to introduce explosive gas into the tank body 12, just open the specific branch valves 32 and the main valve 34.

[0023] In order to explore the thermal runaway of the battery under needle puncture, that is, to simulate the situation where the battery is punctured by foreign objects during actual operation; a puncture needle 41 that can slide in the vertical direction is also provided in the test tank 1, and a through hole 21 for the puncture needle 41 to pass through is opened on the test platform; the puncture needle 41 slides through the through hole 21 to puncture the battery.

[0024] In the embodiment of the present application, a mounting seat 43 is provided in the tank body 12. A thorns rod 42 is threadedly penetrated through the mounting seat 43 in the vertical direction. The thorns rod 42 is a telescopic rod. The thorns rod 42 includes a threaded portion 422 and a fixed portion 421. The fixed portion 421 and the threaded portion 422 are coaxially slidably connected in the vertical direction. The threaded portion 422 is threadedly penetrated through the mounting seat 43. A worm gear 44 is also rotatably connected to the mounting seat 43. The rotation axis of the worm gear 44 is arranged in the vertical direction. The fixed portion 421 is coaxially fixedly connected to the worm gear 44. At the same time, a bearing seat 47 is provided in the tank body 12. A worm 45 is rotatably connected to the bearing seat 47. The rotation axis of the worm 45 is arranged in the horizontal direction. The worm 45 is driven by a motor 46. The worm gear 44 and the worm 45 are meshed. When the motor 46 drives the worm 45 to rotate, the worm gear 44 rotates to drive the fixed portion 421 to rotate. The rotation of the fixed portion 421 drives the threaded portion 422 to rotate, thereby driving the threaded portion 422 to displace in the vertical direction relative to the mounting seat 43, and thus driving the thorns needle 41 to slide in the vertical direction. Finally, the thorns needle 41 passes through the through hole 21 to stab the battery. Here, the inner hole of the fixed portion 421 can also be set as a polygonal hole, and a section of the threaded portion 422 inserted into the fixed portion 421 is a matching polygonal rod.

[0025] Similarly, a wire threading hole 121 for the wire of the motor 46 to enter is formed in the tank body 12, and a sealing ring is also provided on the wire threading hole 121.

[0026] The above are all the preferred embodiments of the present application. The protection scope of the present application is not limited accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A comprehensive test device for thermal runaway of lithium-ion batteries, characterized in that: The invention comprises a test tank (1), wherein a test platform for placing batteries is horizontally arranged in the test tank (1); an air inlet is provided on the test tank (1), and the air inlet is connected to a gas distribution system (3), and the gas distribution system (3) is used to fill gas into the test tank (1); and the test tank (1) is provided with a pressure relief valve (112) and a manual valve (111).

2. The comprehensive test device for thermal runaway of lithium-ion batteries according to claim 1, characterized in that: The gas distribution system (3) comprises a plurality of gas tanks (31), wherein the gas tanks (31) are respectively filled with hydrogen, methane, ethylene, acetylene and air.

3. A comprehensive test device for thermal runaway of lithium-ion batteries according to claim 2, characterized in that: Each of the plurality of gas tanks (31) is provided with a branch valve (32), each of the plurality of branch valves (32) is connected to a main valve (34) (32) via a branch gas path (33), and the main valve (34) (32) is connected to the gas inlet via a main gas path (35).

4. The comprehensive test device for thermal runaway of lithium-ion batteries according to claim 1, characterized in that: The test tank (1) is provided with a piercing needle (41) that can slide in a vertical direction, and the test platform is provided with a through hole (21) for the piercing needle (41) to slide through; the piercing needle (41) slides to pierce or detach from the battery; the test tank (1) is also provided with a driving component for driving the piercing needle (41) to slide.

5. A comprehensive test device for thermal runaway of lithium-ion batteries according to claim 4, characterized in that: The test tank (1) is provided with a mounting seat (43), a piercing rod (42) is threadedly penetrated in a vertical direction on the mounting seat (43), and the piercing needle (41) is fixedly connected to the piercing rod (42).

6. A comprehensive test device for thermal runaway of lithium-ion batteries according to claim 5, characterized in that: The driving assembly comprises a worm wheel (44), a worm (45) and a motor (46); the motor (46) is fixedly arranged in the test tank (1); the output shaft of the motor (46) is arranged in the horizontal direction; the worm (45) is fixedly connected to the output shaft of the motor (46); the worm wheel (44) is rotatably connected to the mounting seat (43); the rotation axis of the worm wheel (44) is arranged in the vertical direction; the worm wheel (44) is meshed with the worm (45); the piercing rod (42) is a telescopic rod; the piercing rod (42) comprises a threaded portion (422) and a fixed portion (421); the threaded portion (422) is slidably connected to the fixed portion (421); the threaded portion (422) is threadedly penetrated on the mounting seat (43); the fixed portion (421) is coaxially fixedly connected to the worm wheel (44).

7. The comprehensive test device for thermal runaway of lithium-ion batteries according to claim 1, characterized in that: The test tank (1) comprises a tank body (12) and a top cover (11), wherein the top cover (11) is rotatably connected to the tank body (12), and the top cover (11) is buckled with the tank body (12) to form the test tank (1).

8. The comprehensive test device for thermal runaway of lithium-ion batteries according to claim 7, characterized in that: The tank body (12) is provided with a wire entry hole (122) for the power supply machine (46) cable to enter and a wire threading hole (121) for the battery cable to enter; the wire threading hole (121) and the wire entry hole (122) are both provided with sealing rings.

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