| 摘要 |
<p>Provided is a battery pack comprising a water drainage system which is capable of effectively draining water which is stagnant in the battery pack by using buoyancy, preventing moisture penetration from outside, and being manufactured so as to have a simple structure to maximize economic efficiency. The battery pack according to the present invention comprises: a battery pack case into which the battery pack is built, a water drainage outlet being formed at one side thereof; and the water drainage system which comprises a main body which is provided in connection with the one side of the battery pack case corresponding to the water drainage outlet, and a floating body which is accommodated in the main body to be elevated by an inflow of fluid and closes the water drainage outlet.</p> |
