Double-battery pow supply device and control method for electric vehicle

The invention discloses a dual-battery power supply device and a control method for an electric vehicle. The device comprises a main battery pack, a sub-battery pack, a main contactor group and a sub-contactor group, wherein the device comprises a main battery pack, a sub-battery pack, a main contactor group and a sub-contactor group. Wherein, the main battery pack is an integral structure; The secondary battery pack includes a plurality of battery subpacks connected to each other; The main contactor group is connected with the main battery pack for controlling the power supply state of the main battery pack; The sub-contactor pack is connected with the sub-battery pack for controlling the power supply state of the sub-battery pack. The method can avoid the drawbacks of high difficulty inmounting and dismounting the auxiliary battery pack in the prior art, thereby reducing the cost and facilitating the standardized control of the battery system of the electric vehicle, and is suitablefor large-scale applicati