Power supply system of electric automobile

The utility model provides a power supply system of an electric automobile. The power supply system comprises a battery pack, a first DC (direct current)/DC converter, a second DC/DC converter, a first switch, a second switch and a third switch, wherein the battery pack is provided with a negative electrode, a first positive electrode and a second positive electrode, the first positive electrode outputs first voltage, the second positive electrode outputs second voltage which is greater than the first voltage, the input end of the first DC/DC converter is connected with the second positive electrode, the input end of the second DC/DC converter is connected with the second positive electrode, the first switch is connected between the second positive electrode and the first DC/DC converter, the second switch is connected between the second positive electrode and the second DC/DC converter, the third switch is connected between the output end of the second DC/DC converter and the first positive electrode. The power supply system disclosed by the utility model adopts lithium iron phosphate batteries, the energy density of the power supply system of the electric automobile is improved, the goals of no pollution, low cost, energy saving and environment protection are achieved, and the driving experience of a user is improved.