The EV battery system start-up capability testing is mainly to verify the EV battery system start-up output power at low temperature and low SOC.

The brief method of EV battery system start-up capability testing is as follows: perform a constant voltage discharge with a maximum current limit based on the maximum pulse discharge current specified by the battery cell manufacturer and collect the voltage U and current I at the end of the discharge pulse.

The low temperature start-up power output of an EV battery system can be calculated by the following two equations.

Calculation formula for average power of the Xth constant voltage discharge.

P_X=(∑U*I)/n

Calculation formula for low temperature starting power.

P=(P₁+P₂+P₃)/3

For EV battery system start-up capability testing, regenerative EV battery testing equipment and temperature cycle chamber are essential.

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