A kind of electric vehicle power-supply system

The invention discloses a kind of electric vehicle power-supply system, comprising: carload controller, an electrical source of power, powers to drive system; In described electrical source of power, there is the first charging inlet, be connected with the first ground charging device; One accumulation power supply, charges to described electrical source of power by DC/DC converter, helps out in the time absorbing the feedback braking energy of described drive system simultaneously; On described accumulation power supply, there is the second charging inlet being connected with the second ground charging device, under the control of described entire car controller, described accumulation power supply can also be realized to described drive system and carry out auxiliary power supply, and the capacity of described accumulation power supply is less than the capacity of described electrical source of power. Electric vehicle power-supply system of the present invention, increase an accumulation power supply, can in multicycle vehicle traveling process, repeatedly charge to electrical source of power on the one hand, effectively increase the exportable capacity of electrical source of power, simultaneously can excitation power power supply activity, effectively extend the life-span of electrical source of power; The characteristic of accumulation power supply is to charge in a large number at short notice on the other hand, is specially adapted to as the timing such as bus, the special-purpose vehicle vehicle that carries out short time stop, many cycle operations of fixing a point.