Electric vehicle power supply systems are crucial components that determine their performance and cruising range, including batteries, charging equipment and power management systems. Batteries provide energy source to electric vehicles for propulsion. Battery type, capacity and performance determine a vehicle's cruising range and acceleration performance. Charging equipment - car chargers or external charging stations - is responsible for charging the battery. The power management system is responsible for overseeing and controlling the battery charging/discharging processes to protect battery safety while extending its service life. Thanks to technology advancements, future electric vehicle power supply systems will become even more efficient, safer, and convenient than their predecessors.