| CPC H01M 10/6568 (2015.04) [H01M 10/613 (2015.04); H01M 10/6556 (2015.04)] | 11 Claims |
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1. A rechargeable battery pack comprising:
a plurality of unit battery packs stacked and coupled to each other in a height direction in multiple stages, the unit battery packs having a cooling water line formed therein to circulate cooling water inside the corresponding unit battery pack, the cooling water line comprising:
a first cooling line extending in the height direction inside the corresponding unit battery pack; and
a second cooling line connected to the first cooling line and extending along an inner bottom surface of the corresponding unit battery pack; and
a connection part connecting the cooling water line in adjacent ones of the unit battery packs to each other such that the cooling water line is configured to circulate cooling water therebetween, the connection part comprising:
a first connection part connected to the first cooling line at a lower portion of a first one of the unit battery packs; and
a second connection part inserted into and connected to the first connection part at an upper portion of a second one of the unit battery packs, and
wherein the first connection part comprises:
a first flange part on a lower surface of the first one of the unit battery packs; and
a first connection pipe coupled to the first flange part, one side of the first connecting pipe being inserted into the first cooling line in the first one of the unit battery packs and another side of the first connecting pipe protruding from the first flange part opposite to the one side of the first connection pipe.
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