電池パック

Abstract

This battery pack contains a battery module in an exterior case. The battery pack has a multilayer float structure comprising an exterior case, an air layer, and an inner wall, wherein the exterior case has a watertight structure having a volume with a total specific gravity of 1 or less with the inner wall being molded into an integral structure along the inner surface thereof, the air layer having a watertight structure is formed between the inner wall and the exterior case, and the inside of the inner wall is a battery module housing part having a watertight structure.

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