What are the methods for lithium battery testing

1. The lithium battery is discharged at a constant current of 0.2C to the specified termination voltage (generally 3.0V) at an ambient temperature of (20±5)℃, and then charged to the termination voltage (generally 4.2C) with a constant current of 0.2C. V), transfer to constant voltage charging (the charge termination current is generally 0.02C); 2. The lithium battery is discharged to the specified discharge termination voltage at a constant current of 0.2C at an ambient temperature of (20±5) ℃; 3. Lithium The battery should be discharged at a constant current of 0.2C at an ambient temperature of (20 ± 5) ℃ to the specified discharge termination voltage; 4. Calculate the capacity (Ah) discharged by the battery in step ⑤. 5. Lithium batteries should be stored in an open circuit at (40±2)℃ for 90 days; 6. Lithium batteries should be charged at (20±5)℃ according to the method in step ①; the charge recovery capacity after storage is calculated The capacity is expressed as a percentage of the rated capacity. 2. Lithium battery charge retention capability and charge recovery capability test: The charge retention capability and charge recovery capability test is mainly to check the capacity retention of the lithium battery after a period of storage, and re-test the battery after the charge retention test Charge it and check its capacity recovery. 1. The lithium battery is discharged at a constant current of 0.2C to the specified termination voltage (generally 3.0V) at an ambient temperature of (20±5)℃, and then charged to the termination voltage (generally 4.2C) with a constant current of 0.2C. V), switch to constant voltage charging (the charge termination current is generally 0.02C); 2. The lithium battery should be stored in an open circuit at an ambient temperature of (20±5)℃ for 28d; 3. The lithium battery should be stored at (20±5)℃ Discharge at a constant current of 0.2C under the ambient temperature to the specified discharge termination voltage; 4. Calculate the capacity (Ah) discharged by the lithium battery in step ③; 5. The charge retention capacity should be calculated according to step ④ to calculate the capacity and the rated capacity. The ratio is expressed as a percentage; 6. The lithium battery should be charged according to step ① within 24 hours after step ③ is discharged; 7. The lithium battery should be discharged at a constant current of 0.2C at an ambient temperature of (20 ± 5) ℃ to the specified discharge Termination voltage; 8. Calculate the capacity (Ah) released by the lithium battery in step ⑦; 9. The charge recovery capacity should be expressed as the percentage of the calculated capacity in step ⑧ compared to the rated capacity. Third, the cycle life test The cycle life test is to check the number of charge and discharge times of the lithium battery when the available capacity drops to the allowable value. ①The lithium battery is discharged at a constant current of 0.2C to the specified termination voltage (generally 3.0V) at an ambient temperature of (20±5)℃, and then charged to the termination voltage (generally 4.2V) with a constant current of 0.2C. ), transfer to constant voltage charging (the charge termination current is generally 0.02C); ②Lithium batteries should be discharged to the specified discharge termination voltage at a constant current of 0.2C at an ambient temperature of (20±5)℃; ③Lithium batteries should Cycle at an ambient temperature of (20±5)℃, and the battery should be left for no more than 1h between charging and discharging or discharging and charging; ④Lithium batteries should be discharged and charged in cycles according to steps ① and ② until the discharge capacity is low 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. Previous post: How about the life of lithium battery?