Battery pack with improved heat radiation and sealing

摘要

A battery pack 1 has a double casing structure, including an inner case 2 placed inside an outer case 3. The inner case 2 includes a radiator plate 9 which is in contact with the side walls of cells 4 contained in the battery pack 1. A forked air passage 32 is defined between the inner and outer cases 2 and 3 from an air inlet 27 along the outer surface of the radiator plate 9 to a pair of air outlets 31.