For battery component temperature test and battery pack surface temperature test, except for different shell surface temperature requirements, the battery pack needs to be tested under two conditions of charging and discharging.
For the test of temperature in the discharge circuit, the fully charged battery pack discharges at a constant current that does not exceed the discharge overcurrent protection value, the temperature is monitored to be thermally stable or discharged to the specified discharge cut-off voltage, and the test is ended.
For the test of temperature in the charging circuit, it is necessary to discharge the empty battery pack with 0.2C to the discharge cut-off voltage specified by the manufacturer.
For the test of temperature in the charging circuit, the vented battery shall be charged according to the constant current and constant voltage charging mode, and the maximum charging voltage shall not exceed the maximum charging voltage recommended by the manufacturer. During the test, the charging current shall not exceed 3 times the maximum charging current or charging protection overcurrent value specified by the manufacturer, the temperature is monitored to be stable, or the battery pack is fully charged, and the test is ended.