Battery performance testing can refer to the following methods: 1. Appearance inspection: Check the product's logo and identification, which includes the manufacturer, specifications and models, trademark, and positive and negative electrodes. If the above content is missing, this test is considered unqualified. During the appearance inspection, special attention should be paid to situations where the marked content does not match the actual situation. The appearance inspection should also assess the quality of the battery casing. Ensure indicators such as shell hardness and injection holes. 2. Low temperature start detection Low temperature start capability detection refers to placing the battery in an environment with a temperature of -18 ℃± 1 ℃ for at least 20 hours within 1-5 hours after fully charging. Within 1 minute after removing the battery in a low-temperature room or low-temperature box, discharge it with high current and check if the discharge time meets the standard. The standard requires a discharge current of 4.5-5 times C20. At 5s, the battery cell voltage should not be lower than 1.5V. At 60s, the battery cell voltage should not be lower than 1.4V, which is the discharge current of the battery within 5 seconds of simulating actual low-temperature starting. 3. Battery capacity testing can be achieved by measuring the appearance dimensions, and the reserve capacity testing method (the national standard is simple, and when the battery capacity is less than 120Ah, the reserve capacity testing method should be preferred. During the testing process, this method has high discharge current, short time, fast electrochemical polarization, and clear reserve capacity values. Generally, three discharge tests are required to determine whether it is qualified.) 4 Temperature resistance can be detected by placing the battery in an environment above 65 ℃ and below -30 ℃ for 24 hours, and then in an environment of 25 ± 10 ℃ for 12 hours, followed by a gas tightness test (according to the standard, each individual cell of the battery is filled or extracted with gas, and the pressure difference between the individual cells and the external environment changes within 3-5 seconds to determine whether the gas tightness is intact). If the test is qualified, This indicates that the battery has good temperature resistance
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