—
7—
-EVE PowerCO,LTD Confidential Proprietary-
Fig.5 Diagram of cell with s welling force clamp
3.4 Dimensions
Test instrument:Automatic wrapping machine;
Test method:Use the wrapping machine to measure the length,width and height of the
cell.And apply a
300 kgf±20 kgf force on it.
The thickness of the cell will increase as the SOC increases as well as with the using time.The
thickness here
indicates the thickness of the cell at the time of delivery.
3.5 Weight
Test instrument:electronic scale;
Test method:measure the weight of the cell by electronic scale.
3.6 Internal Resistance
a. ACR:test the cell at delivery SOC with 1kHz sine wave current at room temperature.
b. DCR:Charge the cell to 3.65 V with constant current of 0.5C,and then charge at constant
voltage of 3.65 V until the current decreases to 0.05C.Rest for 30 min,and discharge with constant
current of 0.5C for 60 min afterwards (adjust the SOC to 50%).Then rest for 1 h,and record the
voltage Vi at the end of the period.Discharge the cell with a constant current of 1C for 10 seconds
and record the voltage V2 at the end of the pulse,and calculate the DCR.,DCR=(V₁-
V₂)×1000/280.0(m(2).
To Next Page
Loading...