A battery pack includes: a packaging housing, including a first arcuate plate and a second arcuate plate, an inner arcuate surface of the first arcuate plate being opposite to an outer arcuate surface of the second arcuate plate; and at least one set of electrode assemblies, comprising a first arcuate electrode assembly and a second arcuate electrode assembly, the first arcuate electrode assembly is disposed on the inner arcuate surface of the first arcuate plate, the second arcuate electrode assembly is disposed on the outer arcuate surface of the second arcuate plate, the inner arcuate surface of the first arcuate electrode assembly and the outer arcuate surface of the second arcuate electrode assembly face to each other, and a first spacing is defined between the inner arcuate surface of the first arcuate electrode assembly and the outer arcuate surface of the second arcuate electrode assembly.