BATTERY CASE, BATTERY SYSTEM, AND VEHICLE

A battery case includes: a plurality of battery branches, where the plurality of battery branches are connected in parallel, and each of the plurality of battery branches includes a battery; branch interfaces arranged corresponding to the battery branches, where the branch interfaces are electrically connected to the corresponding battery branches, and are configured to be connected to an external battery case; a high-voltage power distribution module, electrically connected to the battery branches and configured to perform power distribution management and monitoring on the battery branches; and a main circuit output interface, electrically connected to the battery branches and the high-voltage power distribution module and configured to be connected to a power supply interface of a vehicle. The plurality of battery branches connected in parallel are used to provide electrical energy, and the branch interfaces are provided to connect the external battery case.