NO.

Test steps

Remarks

01

Step 1: Place the cells in a constant temperature climate chamber at 25°C for 6 hours.

Make sure that the cell temperature is the same as the ambient temperature.

02

Step 2: Discharge the cells with a constant current of 1C rate to the termination voltage.

-

03

Step 3: Place the cells in a constant temperature climate chamber at 25°C for 6 hours.

-

04

Step 4: Charge the cells with a constant current of 0.33C to the cut-off voltage, and then charge it with a constant voltage until the current drops to a rate of 0.05C, and then let it stand for 6 hours.

-

05

Step 5: Place the cells in a constant temperature climate chamber at -25°C for 12 hours.

-

06

Step 6: Discharge the cells with a constant power of P1 to the termination voltage.

-

07

Step 7: Repeat steps 3 to 6, the discharge constant-power in step 6 is changed to P2, P3 and Px respectively.

The Px is the maximum discharge constant-power of the battery cell specified by the battery cell manufacturer.

08

Step 8: Repeat steps 3 to 7 three times, where the temperature of step 5 is modified to 0 °C, 25 °C, and 55 °C, respectively.

The three temperature points represent low temperature, normal temperature and high temperature respectively, which can be adjusted according to the working conditions.