&Nbsp; Batteries are devices that can convert chemical energy into electrical energy. Currently, commonly used batteries include dry batteries, lead-acid batteries, lithium batteries, and so on. So how can lithium batteries be tested? Lithium battery testing is divided into single battery testing and module battery testing

The specific method steps are as follows:

Charging test after storage

The detection of charge recovery capacity after storage mainly involves checking the capacity recovery of lithium-ion batteries after being stored for a period of time.

1. At an ambient temperature of (20 ± 5) ° C, discharge the lithium-ion battery at a constant current of 0.2C at a specified termination voltage (usually 3.0V), and then charge it to a termination voltage of 0.2C (usually 4.2V). Switch to constant voltage charging (charging termination current is generally 0.02C) 2. Discharge the lithium-ion battery at a constant current of 0.2C at the specified discharge termination voltage at an ambient temperature of (20 ± 5) ° C 3. Lithium 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) ° C 4. Calculate the discharged capacity (Ah) of the battery in step ⑤ 5. Lithium ion batteries should be opened at an ambient temperature of (40 ± 2) ℃ for 90 days 6. Lithium ion batteries should be charged at an ambient temperature of (20 ± 5) ℃ according to step ① The charge recovery capacity after storage is expressed as the ratio of the calculated capacity to the rated capacity

Secondly, lithium batteries are continuously charged and charge recovery is detected:

The detection of charge retention ability and charge recovery ability mainly involves checking the capacity retention rate of lithium-ion batteries after storage, and then charging the batteries after the charge retention test to check the capacity recovery rate.

1. At an ambient temperature of (20 ± 5) ° C, discharge the lithium-ion battery at a constant current of 0.2C at a specified termination voltage (usually 3.0V), and then charge it to a termination voltage of 0.2C (usually 4.2V). Switch to constant voltage charging (charging termination current is generally 0.02C) 2. Lithium ion batteries should be opened at an ambient temperature of (20 ± 5) ℃ for 28 days 3. Lithium 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) ° C 4. Calculate the capacity (Ah) released by the lithium-ion battery in step ③ 5. The charge retention capacity should be expressed as a percentage of the calculated capacity compared to the rated capacity in step ④ 6. Lithium ion batteries should be charged according to step ① within 24 hours after step ③ discharge 7. Lithium 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) ° C In step ⑦, calculate the capacity (Ah) released by the lithium-ion battery 9. The charge recovery capacity should be expressed as a percentage of the calculated capacity compared to the rated capacity in step the

Thirdly, life testing

Cycle life testing mainly tests the charging and discharging time of lithium-ion batteries when the available capacity drops to an acceptable value.

Lithium ion batteries are discharged at a constant current of 0.2C at an ambient temperature of (20 ± 5) ° C to a specified termination voltage (usually 3.0V), and then charged to a termination voltage of 0.2C (usually 4.2). V) ② Lithium 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) ° C through constant voltage charging (usually with a charging termination current of 0.02C) ③ Lithium ion batteries should be cycled at an ambient temperature of (20 ± 5) ℃, and should not be left for more than 1 hour between charging and discharging, or between discharging and charging