Sony Corporation

Koichi Muto

Hisashi Ohba

Yoshinari Sasaki

A lithium-ion secondary cell is provided to remarkably improve a mechanical peel strength of heat fusion-bonding portions of a container as well as to improve a moisture permeability resistance, a sealing performance, a barrier property, a safety or the like of the container. A lead (,) for use with a lithium-ion secondary cell according to the present invention is sandwiched by heat fusion-bonding portions (,) of a container (,) so as to be exposed in the outside of the container (,) when the container (,) is sealed by heat fusion-bonding. The lead (,) is coated with a heat fusion-bonding seal material (,). This heat fusion-bonding seal material (,) has an excellent adhesion to the lead (,) rather than a material of a sealant layer (,). Also, in the lithium-ion secondary cell, an end portion (,) on the outside portion in the longitudinal direction of the lead (,) in the layer made of the heat fusion-bonding seal material (,) is exposed from the end face of the container (,). Moreover, the lithium-ion secondary cell may have the lead (,) having a mesh structure.

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Kanagawa, Japan

Koichi Muto