Hitachi Vehicle Energy, Ltd.

Toshiro Fujita

Kinya Aota

Masaaki Iwasa

Kouichi Kajiwara

A secondary cell includes: an electrode roll in which a positive foil on which a positive-electrode material is coated and a negative foil on which a negative-electrode material is coated are winded through a separator into a flat shape around a winding core; a case in which the electrode roll is housed; a cover which seals the case; a positive terminal and a negative terminal provided on the cover; a positive electrode current collector plate that is electrically connected to the positive foil of the electrode roll and the positive terminal and held by the cover; and a negative electrode current collector plate that is electrically connected to the negative foil of the electrode roll and the negative terminal and held by the cover. The positive electrode current collector plate and the negative electrode current collector plate are each connected to the winding core.

Secondary cell

A secondary battery includes: a jelly roll that includes a positive and a negative electrode wound via a separator; a case; a lid; and electrically conductive input/output members, wherein: the electrically conductive input/output members include, at least; a positive and a negative electrode current collector plate with one end thereof connected to the positive and the negative electrode respectively; a positive and a negative electrode external conductive member with one end thereof connected to another end of the positive and the negative electrode current collector plate respectively and another end thereof extending to an outer side of the lid; the one end of the positive and the negative electrode external conductive member are respectively swage-fused to the other end of the positive and the negative electrode current collector plate; and an oxide layer is formed at a surface of each swage-fused area.

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Kasumigaura, Japan

Toshiro Fujita