Abstract:

The mechanical impact response datum of the power batteries were collected and the average impact strength curves were obtained in the collision of new energy vehicles to determine the impact test conditions of power battery for new energy vehicles. The average impact strength curve was processed mathematically by means of equivalent trapezoidal wave and least square method. The characteristic value and tolerance of impact strength were obtained and the test conditions were compared with ISO 12405-3. The results show that independent waveforms corresponding to collision patterns should be used to test the power batteries for new energy vehicles in China, which was different from ISO standard in the upper and lower limit and time history of shock wave shape.

Key words: power battery , safety standard , measurement conditions , mechanical shock strength , least square method , equivalent trapezoidal wave ,  impact strength curve