A battery pack, characterized in comprising: a case comprising a receiving cavity and a side wall enclosing the receiving cavity; a plurality of battery modules provided in the receiving cavity; and a fixing frame for fixing the battery modules, comprising a top connecting frame comprising two or more fixing plates spaced apart from each other in a first direction and a connecting component connecting the two adjacent fixing plates, the connecting component comprising a recess portion and an adapter portion connected to each other, the recess portion being recessed in a second direction and the adapter portion being connected to both sides of the recess portion in the first direction, and the connecting component being connected to the two adjacent fixing plates via the adapter portion; and locking plates provided on both sides of the top connecting frame in the first direction and extending along the second direction, the locking plate comprising a first end and a second end in the second direction, and the first end being connected to the top connecting frame and the second end being connectable to the side wall; wherein the first direction intersects the second direction, wherein the top connecting frame is pressed against each of the battery modules, the locking plate is connected to the side wall by the second end, and the connecting component is located between two adjacent battery modules to separate two adjacent battery modules, and wherein the recess portion comprises a bottom plate and side plates, the side plates are spaced apart from each other in the first direction and connected to the bottom plate, the adapter portion has a plate-like structure and is connected to the side plate, the bottom plate and the second end are in the same plane, the bottom plate is provided with a first connecting hole through the bottom plate in the second direction, the second end is provided with a second connecting hole through the second end in the second direction, and the bottom plate is connectable to the side wall. a case comprising a receiving cavity and a side wall enclosing the receiving cavity; a plurality of battery modules provided in the receiving cavity; and a fixing frame for fixing the battery modules, comprising a top connecting frame comprising two or more fixing plates spaced apart from each other in a first direction and a connecting component connecting the two adjacent fixing plates, the connecting component comprising a recess portion and an adapter portion connected to each other, the recess portion being recessed in a second direction and the adapter portion being connected to both sides of the recess portion in the first direction, and the connecting component being connected to the two adjacent fixing plates via the adapter portion; and locking plates provided on both sides of the top connecting frame in the first direction and extending along the second direction, the locking plate comprising a first end and a second end in the second direction, and the first end being connected to the top connecting frame and the second end being connectable to the side wall; wherein the first direction intersects the second direction, wherein the top connecting frame is pressed against each of the battery modules, the locking plate is connected to the side wall by the second end, and the connecting component is located between two adjacent battery modules to separate two adjacent battery modules, and wherein the recess portion comprises a bottom plate and side plates, the side plates are spaced apart from each other in the first direction and connected to the bottom plate, the adapter portion has a plate-like structure and is connected to the side plate, the bottom plate and the second end are in the same plane, the bottom plate is provided with a first connecting hole through the bottom plate in the second direction, the second end is provided with a second connecting hole through the second end in the second direction, and the bottom plate is connectable to the side wall.