| 摘要 |
In a battery having a aluminum or aluminum alloy casing welded to and aluminum or aluminum alloy cover, a film of a synthetic resin and a corrosion preventing agent is formed on the outer surface of the battery raising and an electrolyte comprising hydrofluoric acid is placed in the casing. The film is capable of absorbing hydrofluoric acid. In an alternative embodiment, the exterior film may be a ceramic material capable of absorbing hydrofluoric acid.
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