COOLING STRUCTURE FOR BATTERY PACK

PROBLEM TO BE SOLVED: To achieve miniaturization of a battery pack and a high cooling efficiency.SOLUTION: In a junction box (160) of a battery pack (10), respective members of a battery negative terminal (220), a first relay (410), a second relay (420), a limit resistor (500), a battery positive terminal (210), a third relay (430), a battery control unit positive terminal (310), and a battery control unit negative terminal (320), are arranged in this order. Bus bars (610, 620, 630, 640, and 650) partially exposed to a cooling passage (130) electrically connects between the battery negative terminal and the first relay, between the first relay and the battery control unit negative terminal, among the second relay and the third relay and the battery control unit positive terminal, between the second relay and the limit resistor, and among the limit resistor and the battery positive terminal and the third relay.