Secondary battery employing battery case of high strength

H - Electricity – 01 – M

Patent

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H01M 2/10 (2006.01)

Patent

CA 2577282

Provided is a secondary battery having an electrode assembly installed in a battery case made up of a laminated sheet composed of an outer coating layer of a polymer film, a barrier layer of a metal foil and an inner sealant layer of a polyolefin material, wherein the metal foil of the barrier layer is formed of an aluminum alloy, the outer coating layer is formed of polyethylene naphthalate (PEN) and/or the outer surface of the outer coating layer is provided with a polyethylene naphthalate (PET) layer, and wherein the battery has a nail penetration resistance force of more than 6.5 kgf. The battery in accordance with the present invention exhibits further improved safety due to the ability to significantly reduce the probability of invasion, ignition or explosion as compared to conventional batteries, even when the battery is exposed to external physical impact or is pressed by sharp objects.

L'invention concerne un accumulateur comportant un ensemble électrode qui est disposé dans un logement d'accumulateur constitué d'une feuille stratifiée comprenant une couche de revêtement externe formée d'un film polymère, une couche barrière constituée d'une feuille métallique, et une couche d'étanchéité interne formée d'un matériau à base de polyoléfines. Selon l'invention, la couche métallique de la couche barrière est constituée d'un alliage d'aluminium, la couche de revêtement externe est formée de naphtalate de polyéthylène (PEN), et/ou la surface externe de la couche de revêtement externe est une couche de térephtalate de polyéthylène (PET), et l'accumulateur présente une résistance à l'introduction de clous supérieure à 6,5 kgf. L'accumulateur selon l'invention est plus sûr que les accumulateurs traditionnels dans la mesure où, même lorsqu'il est soumis à un impact physique externe ou à une pression exercée par des objets pointus, les probabilités d'introduction, d'allumage ou d'explosion sont significativement réduites.

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