Showa Denko Packaging Co., Ltd.

Takurou Watanabe

Hiroshi Hata

Daisuke Hashimoto

Keiichi Yokoi

A tab lead including a first insulating film made of resin is adhered to one of surfaces of a part of a region of a metal plate in a length direction of the metal plate and a second insulating film made of resin is adhered to the other surface of the part of the region. Both end portions of the first insulating film and both end portions of the second insulating film are integrally welded to each other. First protruding portions protruding outward in a thickness direction of the first insulating film are formed at regions of the first insulating film corresponding to both widthwise side edges of the metal plate and vicinities thereof. Second protruding portions protruding outward in a thickness direction of the second insulating film are formed at regions of the second insulating film corresponding to both widthwise side edges of the metal plate and vicinities thereof.

Tab lead and method of producing the same

A laminating water-based surface treatment agent according to the present invention includes a chitosan derivative, a carboxyl compound having at least one carboxyl group in a molecule, and water. The content mass ratio of the chitosan derivative/the carboxyl compound falls within a range of 1.0/0.5 to 1.0/3.0. The laminating water-based surface treatment agent of the present invention can form an undercoating excellent in HF-resistance, electrolyte resistance, and solvent resistance, and also can sufficiently secure laminating adherence for a long term under more extreme environments required for a packaging material for a battery case or a tab lead for, e.g., a lithium ion secondary battery for automobiles.

Laminating water-based surface treatment agent, surface treatment method and surface treated material

A terminal leadincludes an inner end portionto be arranged inwardly of an exterior casingwhich accommodates an electrochemistry element, an outer end portionto be arranged outwardly of the exterior casing, and a plate-shaped metallic substrateas a base material. An insulating resin filmis arranged at a portion of the terminal leadcorresponding to a seal portionof the exterior casing. In this terminal lead, a surface coating layeris formed on both surfacesandof the metallic substratein a thickness direction thereof. A coated amount of both widthwise end portionsandof the surface coating layerformed on both surfacesandof the metallic substratein the thickness direction is less than that a widthwise intermediate portionthereof.

Growing community of inventors

Oyama, Japan

Takurou Watanabe