NO.

Test steps

Remarks

01

Step 1: Place the battery cells in a Battery Test Climate Chamber at 25°C for at least 6 hours.

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

02

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

A Battery Cell Cycler is required.

03

Step 3: Place the battery cells in a battery test climate chamber at 25°C for at least 6 hours.

The standing time depends on the temperature, and it is recommended not to be less than 12 hours at low temperature.

04

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

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05

Step 5: Discharge the battery cells with a constant current of 0.33C to the cut-off voltage, and then let it stand for 6 hours.

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06

Step 6: Repeat steps 3 to 5, set the target temperatures in step 3 to -20°C, 0°C and 55°C, respectively.

Under the same charge and discharge current rate, the energy efficiency test under low temperature, normal temperature and high temperature conditions is carried out.

07

Step 7: Repeat steps 3 to 6, set the current rate in step 4 and step 5 to 1C, 2C...XC, respectively.

XC is the maximum charge and discharge current rate specified by the battery cell manufacturer