Method of manufacturing sealed battery and sealed battery

Details Method of manufacturing sealed battery and sealed battery Method of manufacturing sealed battery and sealed battery

H - Electricity

01

M

H01M 2/02 (2006.01) H01M 2/04 (2006.01)

Patent

CA 2308640

The object of the present invention is to provide a sealed battery and a manufacturing method of a sealed battery that suppresses cracking incident to welding using an energy beam, such as a laser beam, when a material such as an aluminum alloy is used for the external casing and the cover plate, with keeping the productivity as high as possible. In order to realize the object, a rib is formed on the cover plate, and the thickness of the external casing at the rim is made small, and the rib and the rim of the external casing are welded together in manufacturing the sealed battery. Then, the closure cap and the external casing are welded together using a laser the energy distribution of which has a flat part in manufacturing the sealed battery to realize the object. In addition, the closure cap and the external casing are welded together while the molten part is gradually cooled in manufacturing the sealed battery to realize the object.

L'invention se rapporte à un procédé de fabrication d'une batterie fermée et à la batterie fermée ainsi produite. Ce procédé assure une productivité optimale et permet cependant d'éviter la formation de fissures lors du soudage au moyen d'un faisceau d'énergie, tel qu'un faisceau laser, même lorsque le boîtier métallique externe et les plaques de recouvrement étanches sont fabriqués dans une matière telle qu'un alliage d'aluminium. On fabrique cette batterie fermée en formant une nervure sur une plaque de recouvrement étanche, en façonnant la bordure d'ouverture du boîtier métallique externe doté d'une faible épaisseur de paroi et en soudant la nervure à la bordure d'ouverture du boîtier métallique externe. On utilise ensuite un faisceau laser ayant une distribution d'énergie présentant une partie plate pour souder l'une à l'autre la plaque de recouvrement étanche et le boîtier métallique externe de façon à produire la batterie fermée. En outre, on soude la plaque de recouvrement étanche et le boîtier métallique externe tout en refroidissant lentement la zone en fusion.

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