CURRENT SWITCHING DEVICE FOR EMERGENCY START POWER SUPPLY OF CAR

Provided is a current switching device for an emergency start power supply of a car, including: a lithium battery voltage sampling circuit configured to collect a lithium battery voltage in the emergency start power supply; a battery voltage sampling circuit configured to collect a battery voltage of the car; a control module configured to output a first control signal and a second control signal based on the lithium battery voltage and the battery voltage; a precharging circuit configured to transmit lithium battery energy of the emergency start power supply into a battery based on a first current when the first control signal is at a high level; and a relay configured to transmit the lithium battery energy of the emergency start power supply into the battery based on a second current when the second control signal is at a high level.