US Patent 11177522 Battery pack

A battery pack includes a fixing frame, at least one battery assembly, and a monitoring device for monitoring the at least one battery assembly, wherein the battery assembly is disposed on the fixing frame. The battery assembly includes a plurality of battery modules which are arranged along a predetermined axial direction. The monitoring device is disposed on the fixing frame, and is located on a side of the battery assembly in the predetermined axial direction. A minor axis of the monitoring device is located in the predetermined axial direction. In this way, the overall length of the battery pack can be reduced.