-15
-EVE PowerCO.,LTD Confidential Proprietary-
Store the cell for 28 days at 25°C±2°C and rest for 5 h at 25°C ±2℃;
Discharge to 2.5 V at a constant power of 448W and rest for 30 min;
Charge to 3.65 V at a constant power of 448W and rest for 30 min,note the energy as Eg;
Discharge to 2.5 V at a constant power of 448W and rest for 30 min,note the energy as Eo*;
Charge energy recovery rate =Eg/Eo*100%; discharge energy recovery rate=Eio*/E*100%.
3.14.2 45°C Storage
Charge the cell according to (3.8)at the ambient temperature of 25°C ±2℃;
Discharge for 60 min at a constant powerof448 Wand rest for 30 min;
Store the cell for 28 days at the ambient temperature of 45°C±2°C and rest for 5 h at the
ambient temperature of 25℃±2℃;
Discharge to 2.5 V at a constant powerof448 W and rest for 30 min;
Charge to 3.65 V at a constant powerof448 W and rest for 30 min;
Discharge to 2.5 V at a constant powerof448 Wand rest for 30 min,note the energyas E10*;
Discharge energy recovery rate =E10*/Eo*100%.
3.15 Cycle life
3.15.1 25℃ Cycle
Before the test,prepare and install the clamp according to 3.3.1
Pre-cycle initial capacity test:test the cell energy according to (3.10).
Cycle test:at ambient temperature of 25°C±2℃;
a. Discharge the cell in accordance with (3.9);
b.Charge the cell to 3.65 V at a constant power of 448 W and rest for 30 minutes;
c.Discharge to 2.5 V at a constant powerof448 W and rest for 30 minutes;
d.Repeat steps b~c6000 times.
b. 448 W 3.65 V, 30 min;
c.448 W 2.5 V, 30 min;
d.b~c 6000cycle
Capacity test after cycling at ambient temperature of25°C±2℃:
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