Electric vehicle energy storage system

The invention provides an electric vehicle energy storage system, which comprises an energy storage module, a voltage conversion module, a first switch module and a control module, wherein the maximumvalue of the output voltage of the energy storage module is greater than the minimum value of the output voltage of a power supply network, the power supply network is connected with the voltage conversion module through the first switch module, the voltage conversion module is also connected with the energy storage module, and the control module is used for controlling the power supply network to charge the energy storage module through the voltage conversion module when the first switch module is closed. According to the electric vehicle energy storage system provided by the invention, whenthe first switch module is closed, the control module charges the energy storage module by controlling the power supply network, so that the cost of arranging a ground charging device is reduced, thecharging mode is simple, a