Composite energy storage system for automobiles

The invention relates to an energy storage system, in particular to a composite energy storage system for automobiles, and belongs to the technical field of new energy automobiles. The composite energy storage system comprises an energy type battery pack, a power type battery pack and a switch K1, wherein a pair of like-polarity ends of the energy type battery pack and the power type battery pack are connected in parallel and are further connected with a direct-current bus of corresponding polarity; the other end of the energy type battery pack is connected with the switch K1 in series, is connected with the other end of the power type battery pack in parallel, and is further connected with a direct-current bus of corresponding polarity; the direct-current buses are connected with a power system load; at least one of the two battery packs is provided with a battery management system; the battery management system is used for controlling the switch K1. According to the composite energy storage system, the two battery packs can work in an optimal working condition, and respective advantages of the two battery packs can be brought into play sufficiently.