| 摘要 |
<p>PURPOSE:To prohibit invasion of water or mud into a box main body by providing a second passage provided on the upper side of a chamber for guiding cooling air sucked into the chamber into the box main body. CONSTITUTION:External cooling air is introduced to a box main body 34 from a suction passage member 41, and plural batteries contained in the box main body 34 are cooled. At this time, the cooling air is once sucked to the lower end side in a chamber C from up through a first passage 43 to be introduced to the box main body 34 through a second passage 46 provided at an upper part of the chamber C. If water or mud invades from the external into the chamber C through the first passage 43, therefore, invasion of water or mud into the box main body 34 through the second passage 46 positioned at the upper part of the chamber C can be prohibited.</p> |
