Nominal Specification of Samsung-21700-48G

SAMSUNG INR21700 48G BATTERY PACK LIST

Note (*¹): Protection function of the battery pack should be set within the specified charge, discharge and temperature range in Cell Specification.

Note (*2 ): Discharge OTP(over temp. protection) should not be over 80℃ of temperature. Protection set should be based on the location of the cell surface with the highest temp increase part of the battery pack.

Note (*3 ): If Cell is kept as ex-factory status (30% of charge), the capacity recovery rate shall be more than 90%

Characteristics

Standard charge

This “Standard charge” means charging the cell with charge current 1440mA and constant voltage 4.2V at 23℃, 96mA cutoff.

Standard discharge capacity

The standard discharge capacity is the initial discharge capacity of the cell, which is measured with discharge current of 960mA with 2.5V cut-off at 23℃ within 1 hour after the “Standard charge”. In this case the minimum capacity of the standard discharge capacity is 4,700mAh in warranty.

Standard discharge capacity ≥ 4,700mAh

Standard discharge energy

The standard energy is the initial discharge energy of the cell, which is measured with discharge current of 960mA with 2.5V cut-off at 23℃ within 1 hour after the “Standard charge”. In this case the minimum capacity of the standard discharge capacity is 17.04Wh in warranty. Standard discharge energy ≥ 17.04Wh

Initial internal impedance (AC resistance)

Initial internal impedance measured at AC 1kHz after Standard charge.

Initial internal impedance ≤ 35mΩ

DC impedance

DC impedance is measured at 50% SOC(state of charge) state. After Standard charge, discharge with constant current of 2,400mA for 1hr followed by 30min rest time (Check voltage at this time – V1).  Discharge with constant current of 2,400mA for 30sec (and check voltage at 10sec – V2)

Initial DC impedance = (V1-V2)[mV] / 2400[mA] ≤ 50mΩ

DC impedance growth (DCR (%) increase)

DC impedance growth means % increased DC impedance after cycle or storage test compared with initial DC impedance

DCR (%) increase = [ (*DCR(f) / **DCR(i)) – 1] x 100

* DCR(i) : initial DC impedance, **DCR(f) : DC impedance after cycle or storage test

Temperature dependence of discharge capacity

Discharge capacity comparison according to the discharging temperature, measured with constant current discharge at 23℃ with 960mA and 2.5V cut-off after charging at the following temperatures,

Note:

If the charge temperature and discharge temperature is not the same, the interval for temperature change is 3 hours. Minimum capacity (4,700mAh) is 100% Percentage as an index of the relative capacity.

Temperature dependence of charge capacity

Discharge capacity comparison according to the charging temperature, measured with constant current discharge at 23℃ with 960mA and 2.5V cut-off after charging at the following temperature is as follows,

Note:

If charge temperature and discharge temperature is not the same, the interval for temperature change is 3 hours. Minimum capacity (4,700mAh) is 100% Percentage as an index of the relative capacity.

Parts of 10380- 26650 CELLS List