Power supply unit and heat radiation method therefor

摘要

A power supply unit of the present invention comprises a group of batteries including plural rows of cells (1) arranged in parallel, each row of cells including plural cylindrical cells connected in series. The power supply unit further comprises refrigerant passages (5) comprising main refrigerant passages exposed to the cells arranged in each row of cells and auxiliary refrigerant passages (4), the upstream sides of the auxiliary refrigerant passages being isolated from the rows of cells, and the downstream sides thereof being connected to the main refrigerant passages at positions corresponding to the midstream or downstream sides of the rows of cells.