Dimension: Diameter 21.7mm ± 0.2mm, Height 70.9mm ± 0.2mm. Refer to the attached drawing 1.
5. APPEARANCE
There shall be no such defect as deep scratch, flaw, crack, rust, leakage, which may adversely affect commercial value of the cell.
6. TEST CONDITION AND DEFINITIONS
7. CHARACTERISTICS
3
INR 21700 50 E
Cylindrical Lithium Ion Cell
3.
9
WEIGHT OF BARE CELL
3.1
0
OPERATING ENVIROMENTAL TEMPERATURE
3.1
1
STORAGE TEMPERATURE (FOR SHIPPING STATE)
4.
OUTLINE DIMENSION (UNIT: MM)
Avg.
72g ± 4g
Charge
0°C ~ 45°C
Discharge
-20°C ~ 55°C
1 month
-20°C ~ 50°C
3 months
-20°C ~ 40°C
12 months
-20°C ~ 20°C
6.1 MEASURING EQUIPMENT
6.1.1 ELECTRONIC BALANCE
6.1.2 MANUAL VOLTAGE-IMPEDANCE TESTER
6.1.3 DIGITAL CALIPER
Parameter mileage 0.01g-160g,accuracy 1mg
Impedance: Parameter mileage 0-3.1kΩ, accuracy 0.1μΩ,
The impedance meter should be operated at AC 1kHz
Parameter mileage 0-150mm, accuracy ± 0.02mm,
resolution ratio 0.01mm
6.2
Unless otherwise specified, all tests shall be performed at 25°C ± 2°C and humidity of 65%RH ± 20%RH. The cells used
for the test mentioned should be new ones delivered a week before at most.
6.3 DEFINITION
C Rate (“C”):
The rate (milliamperes) at which a fully charged cell is
discharged to its end voltage in one (1) hour.
7.1 CHARGE METHOD
7.1.1
Charging shall consist of charging at a 0.2C constant current rate until the cell voltage reaches 4.2V. The cell shall then be
charged at constant voltage of 4.2V while tapering the charge current. Charging shall be terminated when the charging
current has tapered to 0.02C.
7.1.2
Charging shall consist of charging at a 0.3C constant current rate until the cell voltage reaches 4.2V. The cell shall then be
charged at constant voltage of 4.2V while tapering the charge current. Charging shall be terminated when the charging
current has tapered to 0.05C.
7.1.3
Charging shall consist of charging at a 1.0C constant current rate until the cell voltage reaches 3.80V ,0.8C constant
current rate until the cell voltage reaches 4.00V, 0.6C constant current rate until the cell voltage reaches 4.10V, 0.4C
constant current rate until the cell voltage reaches4.19V, 0.2C constant current rate until the cell voltage reaches 4.195V,
0.05C constant current rate until the cell voltage reaches 4.20V.
TerraE Confidential Proprietary and not be reproduced without written permission from BMZ Germany GmbH, Zeche Gustav 1, 63791 Karlstein
