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-EVE PowerCO,LTD Confidential Proprietary-
3.7 Pretreatment
Before the formal test,pretreat the cell to ensure it is activated and stable.The steps are as follows:
a.Charge the cell according to the standard charging mode;
b.Discharge the cell according to the standard discharging mode;
c.Repeat a~b no more than 5 times;
If the discharge capacity of the cell changes no more than 3%of the nominal capacity for two
consecutive times,it is considered that the cell has completed the pretreatment,and the
pretreatment cycle can be terminated.
3.8 Charge Calibration
At the ambient temperature of 25°C±2℃,rest for 5h;
Discharge at a constant powerof448 W to 2.5 V and rest for 30 min;
Charge at a constant powerof448 W to 3.65 V,and rest for 30 min.
3.9 Discharge Calibration
At the ambient temperature of 25°C±2℃,rest for 5h;
Charge at a constant power of 448W to 3.65 V,and rest for 30 min;
Discharge at a constant power of 448W to 2.5 V,and rest for 30 min.
3.10 Capacity and Energy Calibration
Capacity calibration is to discharge the cell according to (3.9)at the ambient temperature of
25±2℃.Charge the cell at a constant power of 448 W to 3.65 V and rest for 30 min.Discharge the cell at
a constant power of 448 W to 2.5V and rest for 30 min.Repeat 5 times and record the average of the
last three charging energy as Eo,the average of the last
three discharging energy as Eo and the average of the last three discharging capacity as Co*.
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