| 摘要 |
PROBLEM TO BE SOLVED: To achieve downsizing of a battery unit and concurrently radiate heat of a heating element in a proper manner.SOLUTION: A battery unit includes: a battery pack module 11; a control board on which a switching element is mounted; a housing case housing the battery pack module 11 and the control board; and a heat sink 60 provided in the housing case and configured to radiate heat of the switching element. The heat sink 60 has: a heat receiving part 62 having a heat receiving surface overlapping with the control board; and a heat transmission part 63 which transmits heat received by the heat receiving part 62 to the side of the housing case. The heat receiving part 62 and the heat transmission part 63 extend in directions different from each other and form an eaves shape.SELECTED DRAWING: Figure 12 |
