BATTERY CHARGING METHOD AND VEHICLE ELECTRIC SYSTEM

The present application provides a battery charging method and a vehicle electrical system that enable charging piles to safely and efficiently charge low-SOC power batteries in low-temperature environments. The battery charging control method is applicable to a vehicle electrical system, wherein the system includes a current control unit that includes a semiconductor device. The method includes: controlling, when the temperature of the battery is below a first preset temperature, the current control unit to be in a first state, wherein the first state includes a state in which the semiconductor device is reversely connected into a circuit; sending a first charging request, wherein the first charging request includes a first charging current; controlling, when the temperature of the battery reaches the first preset temperature, the current control unit to be in a second state, wherein the second state includes a state in which the semiconductor device is connected out of the circuit or a state in which the semiconductor device is forwardly connected into the circuit; and sending a second charging request, wherein the second charging request includes a second charging current at which the battery is charged.