What is the specific method of lithium ion battery detection

1. Under the ambient temperature of (20±5)℃, the lithium ion battery is discharged to the specified termination voltage (generally 3.0V) at a constant current of 0.2C, and then charged to the termination voltage (generally at a constant current of 0.2C). 4.2V), transfer to constant voltage charging (the charge termination current is generally 0.02C); 2. The lithium ion 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-ion battery should be discharged to the specified discharge termination voltage at a constant current of 0.2C at an ambient temperature of (20±5)℃; 4. Calculate the capacity (Ah) discharged by the battery in step ⑤. 5. Lithium-ion batteries should be stored in an open circuit at (40±2)℃ for 90 days; 6. Lithium-ion batteries should be charged at (20±5)℃ according to the method in step ①; the charge recovery capacity after storage It is expressed as a percentage of the calculated capacity compared to the rated capacity. 2. Lithium ion battery charge retention capacity and charge recovery capability test: The charge retention capability and charge recovery capability test are important to check the capacity retention of lithium ion batteries after a period of storage, and to test after the charge retention test Recharge the battery and check its capacity recovery. 1. Under the ambient temperature of (20±5)℃, the lithium ion battery is discharged to the specified termination voltage (generally 3.0V) at a constant current of 0.2C, and then charged to the termination voltage (generally at a constant current of 0.2C). 4.2V), transfer to constant voltage charging (the charge termination current is generally 0.02C); 2. Li-ion batteries should be stored in an open circuit at (20 ± 5) ℃ for 28 days; 3. Li-ion batteries should be stored at (20 ± 5) ℃ 5) Discharge at a constant current of 0.2C to the specified discharge termination voltage at an ambient temperature of °C; 4. Calculate the discharge capacity (Ah) of the lithium-ion battery in step ③; 5. The charge retention capacity should be calculated according to step ④ It is expressed as a percentage compared with the rated capacity; 6. The lithium ion battery should be charged according to step ① within 24 hours after discharge in step ③; 7. The lithium ion battery should be charged at a constant current of 0.2C at an ambient temperature of (20 ± 5) ℃ Discharge to the specified discharge termination voltage; 8. Calculate the discharge capacity (Ah) of the lithium-ion 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. 3. Cycle life detection Cycle life detection is important to check the number of charge and discharge times of lithium-ion batteries when the available capacity drops to the allowable value. ①The lithium ion 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); ②Li-ion 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 The ion battery should be cycled 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 ion batteries should be discharged and charged in cycles according to steps ① and step 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. Previous: Why do we need a high-rate lithium-ion battery? What are the advantages of high-rate lithium-ion batteries?