BATTERY PACK

摘要

PROBLEM TO BE SOLVED: To provide a battery pack which warms up a battery while inhibiting enlargement of the battery pack.SOLUTION: A battery pack 1 includes: a battery module 11; a junction block 12; and a housing 13 including a battery housing part 13a and a relay housing part 13b. The battery housing part 13a and the relay housing part 13b are placed adjacent to each other. In the housing 13, an opening/closing member 131 is provided between the battery housing part 13a and the relay housing part 13b. The battery pack 1 is formed so that the opening/closing member 131 is opened to form a communication part 13c and air in the relay housing part 13b is sent to the battery housing part 13a when a battery temperature is equal to or lower than a threshold value T1.