| 摘要 |
PURPOSE: To provide a battery pack excellent in waterproofness and drip- proofness and easy to mass-produce by packing a battery pack main body section containing plural unit cells and a wiring circuit in an exterior case main body with a waterproof plastic film container. CONSTITUTION: A battery pack main body section 2 constituted of plural unit cells 2a and a wiring circuit electrically connecting them is stored and fixed in an exterior case 5 constituted of an exterior case main body 1 and a cover body 4 via adhesive tapes 6a-6c. A waterproof plastic film 3 is suspended on the opening section of the exterior case main body 1 to seal it. The waterproof plastic film preferably has the moisture transmission factor of 200×10<-11> cc.cm/ cm<2> .sec.atm or below at the operating temperature of a battery pack, it is formed with one or more layers, it preferably contains a water absorbing or oil absorbing resin 50-0.5%, and it preferably has the volume electric resistance of l0<5>Ω.cm or below.
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