1、 Short circuit test according to UL2054 standard for battery safety performance: 1.01. Test conditions: A. The positive and negative electrodes of each test battery sample adopt resistance values< Short circuit the 0.1Q Cu wire and discharge the battery until it catches fire or explodes, or until the battery is completely discharged and the shell temperature drops back to room temperature to stop. B. The test is conducted at room temperature and 60 ± 2 ℃, and the battery is shorted after reaching equilibrium and stability with the environment at room temperature or 60 ± 2 ℃. C. Unless specified by the manufacturer as series or parallel, the battery should be tested separately. For series or parallel applications, an additional five sets of batteries need to be tested, and the maximum number of batteries used depends on the number of series/parallel connections used. D. When there is an overcurrent or thermal protection device in the battery and it has been UL certified, it is necessary to test the battery under the maximum load condition when the protection device is not opened. For non certified protective devices, they must be short circuited. 1.02. Test results: The sample should not ignite or explode, and the temperature of the casing or battery casing should not exceed 150 ℃. 2、 Compression test for battery safety performance: 2.01. Test requirements: The battery is compressed between two flat surfaces, and the compression force is applied through a hydraulic piston with a diameter of 32mm. The compression continues until the pressure reaches 17.2Mpa, and the applied pressure is 13KN. When the maximum pressure is reached, the pressure is released. 2.02. Test results: The sample should not ignite or explode, and the sample should not leak liquid. 3、 Combustion particle test for battery safety performance: 3.01. Test requirements: Each test battery is placed on a wire mesh with 20 holes per inch (25.4mm), with a wire diameter of 0.017 inches. Place the wire mesh at a distance of 1-1/2 (38.1mm) inches from the burner. Fuel and air are sprayed at a speed that provides a bright blue flame, causing the wire mesh to burn into a bright red color. One coarse asbestos cloth panel is placed at a vertical distance of 3 feet (0.91m) from the center of the steel mesh, as shown in Figure 22.1, 22.2. A piece of coarse asbestos cloth measuring one yard square is composed of four layers of coarse asbestos cloth material weighing 0.4-0.6 ounces per square yard. The test sample is placed at a location where sparks or combustion particles can be sprayed onto the center of the coarse asbestos cloth. In some cases, it should be required to enclose the experimental sample in a mesh, then ignite the burner and observe the battery until it explodes or is destroyed. 3.02. Test results: The coarse asbestos cloth surface wrench will not ignite