BATTERY PACK, BATTERY MODULE, VEHICLE AND ENERGY STORAGE DEVICE

This application provides a battery pack, a battery module, a vehicle and an energy storage device. The battery pack at least includes one battery sequence. The battery sequence includes a plurality of batteries. A thickness of each battery extends along a first direction. The plurality of batteries are successively arranged along the first direction to form the battery sequence. At least one of the batteries includes a casing and a core packaged in the casing. A gap exists between at least two neighboring batteries. A ratio of the gap to the thickness of the battery is c, and c satisfies the following relational expression: c/a=0.01~0.5, where a represents an expansion rate of the battery. The battery pack provided by this application has a long service life and high space utilization.