How to test the performance of lithium-ion batteries

1. The lithium ion battery is discharged to the specified end voltage (usually 3.0V) at a constant current of 0.2C at an ambient temperature (20±5) ℃, then charged to the end voltage (usually 4.2V), and then switched to constant voltage Charging (the charge termination current is generally 0.02C); 2. Li-ion batteries should be stored in an open-circuit environment at (20±5)°C for 28 days; 3. Li-ion batteries should be stored at an ambient temperature of (20±5)°C under 0.2C The constant current of C is discharged to the prescribed end-of-discharge voltage. 4. Calculate the capacity (Ah) released by the lithium ion battery in the step. 5. The charge retention capacity should be expressed as a percentage of the calculated capacity compared to the rated capacity in the step. 6. The lithium ion battery should be charged according to step ① within 24 hours after the step is discharged; 7. The lithium ion battery should be discharged to the specified discharge termination voltage at a constant current of 0.2C at an ambient temperature (20±5) ℃; 8. Calculate the capacity (Ah) released by the lithium ion battery in step ⑦; 9. The charge recovery capacity should be expressed as the ratio of the capacity calculated in step the to the rated capacity. When the available capacity drops to the allowable value, the cycle life test is very important to check the number of charging and discharging of the lithium-ion battery. ①When the ambient temperature is (20±5)℃, discharge the lithium-ion battery to the specified termination voltage (usually 3.0V) at a constant current of 0.2C, and then charge the lithium-ion battery to the termination voltage (usually 4.2C) ). Constant current 0.2CV), switch to constant voltage charging (the charge termination current is generally 0.02C); ②Lithium-ion batteries should be discharged to the specified discharge termination voltage at a constant current of 0.2C at an ambient temperature (20±5) ℃. ③Lithium-ion batteries should be used in cycles at (20±5)℃, and should be stored for no more than 1h between charging and discharging or between discharging and charging. ④Lithium-ion batteries should be cyclically charged according to steps ① and ② until The discharge capacity is less than 70% of the rated capacity. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete.