| 摘要 |
A battery pack includes: a plurality of cells which are lithium ion secondary batteries; an exhaust passage section which is adjacent to the cells and allows a flow of gas generated from at least one of the cells; a case accommodating the plurality of cells and the exhaust passage section; and a gas release duct 42 which is attached to the case and through which the gas having flowed through the exhaust passage section is released outside, wherein the gas release duct is hermetically closed with a lid 51 which is made of a waterproof member and is arranged at an exit 44 or on a release path of the gas release duct, an opening member 61 configured to open the lid to open the gas release duct is further provided, and the opening member is operated by the gas generated from the cell.
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