Battery holder, power transfer device, electric vehicle and installation method for power transfer device

A battery holder, for being mounted on the body of an electric vehicle to fix a battery pack, the battery holder comprises a fixing bracket and a plurality of lock mechanisms, the lock mechanisms are fixed on the fixing bracket, characterized in that the battery holder further comprises:

• a plurality of supporting devices, which are fixed on one side of the fixing bracket facing the battery pack, and the plurality of supporting devices provide a plurality of support points to support the battery pack;
• the plurality of supporting devices are distributed on both sidewalls of the fixing bracket in the length direction of the fixing bracket;
• in the length direction of the fixing bracket, both sidewalls of the fixing bracket are both arranged with two lock mechanisms, the two lock mechanisms are a primary lock mechanism and a secondary lock mechanism;
• the secondary lock mechanism is used to provide a secondary locking function or a locking protection function for the battery pack, when the primary lock mechanism fails, it is used to prevent the battery pack from falling.