A novel pulse self-heating strategy is proposed to enable quick warming of the battery. The battery is heated up using pulse self-discharge signal generated by self-designed circuit. Pulse heating can provide faster heating with lower polarization. Internal resistance and off-period voltage are predominant influence on heating duration.
Temperature response in pulse self–heating To acquire the temperature and voltage variation of the battery during self–heating, the pulse heating signal is applied to the battery. Heating is performed with the switching interval of 0.5 s. The initial ambient temperature is −10 °C, and heating is switched off when the battery reaches 10 °C.
Conclusions A pulse internal self–heating strategy is proposed to achieve quick battery heating. An electric circuit is built to generate intermittently high current in the battery. Fluctuation of off–period voltage and on–period voltage are observed, and this fluctuation amplitude gradually decreases as the heating proceeded.
The alternating pulse self-heater demonstrates significant potential in enhancing both heating efficiency and energy utilization while not aggregating the battery capacity. The proposed self-heater provides a solution against cold climates for lithium-ion batteries, improving the driving performance of electric vehicles in cold temperatures.
Higher SOC is suggested for pulse heating to achieve heating duration within 200 s. Battery warming at low temperature is a critical issue affecting battery thermal management. In this study, the pulse self–heating strategy is proposed to enable quick and safe warming of lithium–ion battery at low temperature.
In this study, the pulse self–heating strategy is proposed to enable quick and safe warming of lithium–ion battery at low temperature. The battery is heated up using pulse self–discharge. This strategy can heat up 18,650 commercial battery with a control circuit and alleviate the battery degradation during heating.