step 1

Capacity and DC impedance calibration at room temperature (25˚C)

step 2

Constant current and constant voltage charging at ambient temperature (25˚C)

step 3

Hold the battery for 5 hours at low temperature (X˚C)

step 4

0.5C constant current discharge at low temperature (X˚C)

step 5

Hold the battery for 5 hours at room temperature (25˚C)

step 6

Constant current and constant voltage charging at ambient temperature (25˚C)

step 7

Hold the battery for 5 hours at low temperature (X˚C)

step 8

1C constant current discharge at low temperature (X˚C)

step 9

Hold the battery for 5 hours at room temperature (25˚C)

step 10

Constant current and constant voltage charging at ambient temperature (25˚C)

step 11

Hold the battery for 5 hours at low temperature (X˚C)

step 12

2C constant current discharge at low temperature (X˚C)

step 13

Capacity and DC impedance calibration at room temperature (25˚C)

step 14

Transform X, repeat step 2~ step 13 until all cryogenic temperatures are tested