14500 battery

　　How to test 14500 battery

　　To understand how to perform lithium battery testing, you first need to understand the performance indicators of 14500 battery. What are the performance indicators of 14500 battery? The three main indicators are electrical performance, lifespan and safety. Then the lithium battery test is divided into single battery test and module battery test. The specific method steps are as follows:

　　 Charging test after storage

　　 The detection of charge recovery capacity after storage is mainly to check the capacity recovery of lithium-ion batteries after storage for a period of time.

　　1. Discharge the lithium-ion battery at a constant current of 0.2C at the specified termination voltage (usually 3.0V) at ambient temperature (20±5)°C, and then charge to 0.2C (usually 4.2V) termination voltage. Switch to constant voltage charging (charge termination current is generally 0.02C);

　　2. Discharge the lithium-ion battery at a constant current of 0.2C at the specified discharge end 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 ambient temperature (40±2)℃ for 90 days.

　　6. Lithium-ion batteries should be charged according to step ① at ambient temperature (20±5)℃.

　　 The charge recovery capacity after storage is expressed as the ratio of the calculated capacity to the rated capacity.

　　 Secondly, the lithium battery is continuously charged and detects charge recovery:

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

　　1. Discharge the lithium-ion battery at a constant current of 0.2C at the specified termination voltage (usually 3.0V) at ambient temperature (20±5)°C, and then charge to 0.2C (usually 4.2V) termination voltage. Switch to constant voltage charging (charge 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 holding capacity should be expressed as the 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 being discharged in step 3.

　　7. Lithium-ion batteries should be discharged to the specified discharge end voltage at a constant current of 0.2C at an ambient temperature of (20±5)°C.

　　 8. In step ⑦, calculate the capacity (Ah) released by the lithium-ion battery.

　　9. Charge recovery capacity should be expressed as a percentage of the calculated capacity compared to the rated capacity of step the.

　　 Three, life test

　　 The cycle life test mainly tests the charging and discharging time of lithium-ion batteries when the available capacity drops to an acceptable value. ①The lithium-ion battery is discharged to the specified termination voltage (usually 3.0V) at a constant current of 0.2C at ambient temperature (20±5)°C, and then charged to a termination voltage of 0.2C (usually 4.2). V), provided by constant voltage charging (charge termination current is usually 0.02C)

　　②Lithium-ion batteries should be discharged to the specified discharge end voltage at a constant current of 0.2C at an ambient temperature of (20±5)°C.

　　③Lithium-ion batteries should be cycled at ambient temperature (20±5)℃, and should not be left for more than 1 hour between charging and discharging or between discharging and charging;

　　④ Follow steps ① and ② to charge the lithium battery until the discharge capacity is less than 70% of the rated capacity.

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