Lithium battery performance test

Lithium battery is a product that requires high quality and high safety. Consumers are using The performance of the battery is often not clear when it is used, resulting in the efficiency of the battery when it is used. The safety of life will also be impaired by the occurrence of this, so it is also important to understand the performance of the battery. Lithium battery performance test mainly includes voltage, internal resistance, capacity, internal pressure, white Discharge rate, cycle life, sealing performance, safety performance, storage performance, appearance Etc. Others include overcharge, overdischarge, solderability, corrosion resistance, etc.

Self-discharge test

Self-discharge test The self-discharge test of nickel-cadmium and nickel-metal hydride batteries is: due to the standard charge retention test The test time is too long, generally 24 hours of self-discharge is used to quickly test its charge retention Ability to discharge the battery at 0.2C to 1.0V. Charge it at 1C for 80 minutes, and put it aside for 15 minutes Bell, discharge to 10V at 1C, measure its discharge capacity C1, and then charge the battery at 1C for 80 Minutes, after 24 hours of storage, measure 1C capacity C2, C2/C1×100% should be less than 15% ㅤ: The self-discharge test of lithium battery is: generally use 24-hour self-discharge to quickly Test its charge retention ability, discharge the battery at 0.2C to 3.0V, constant current and constant voltage Charge to 4.2V at 1C, cut-off current: 10mA, after 15 minutes of storage, discharge at 1C to 3.0V test its discharge capacity C1, then charge the battery to 4.2V with constant current and constant voltage at 1C, cut off Stop current 100mA, test 1C capacity C2 after being left for 24 hours, C2/C1×100% should be larger At 99%. The internal resistance of the battery refers to the current flow through the battery when the battery is in Resistance is generally divided into AC internal resistance and DC internal resistance. Because the internal resistance of rechargeable batteries is very small, When measuring DC internal resistance, since the electrodes are easily polarized, polarized internal resistance is generated, so it cannot be measured Its true value; and measuring its AC internal resistance can avoid the influence of polarization internal resistance, and get the true : The inner value of. The AC internal resistance test method is: using a battery equivalent to an active resistance Features: Give the battery a constant current of 1000HZ, 50mA, and sample its voltage. A series of processing such as flow filtering to accurately measure its resistance.