Kabushiki Kaisha Nihon Micronics

Guala Technology Co., Ltd.

Shozo Izumo

Akira Nakazawa

Tomokazu Saito

Kiyoyasu Hiwada

Takuo Kudoh

Tatsuo Inoue

Tomokazu Saitoh

Provided is a secondary battery in which a single-layer secondary cell has an all-solid-state secondary cell structure with a storage layer sandwiched between a positive electrode layer and a negative electrode layer and which is superior to a conventional secondary battery with respect to at least one of volume, operation, and positioning. The present invention provides a secondary battery including a folded single-layer secondary cell formed by folding a sheet-shaped single-layer secondary cell, with a storage layer sandwiched between a positive electrode layer and a negative electrode layer, two or more times while alternately reversing the folding direction.

Secondary battery

Provided is a secondary battery being superior to a conventional secondary battery with respect to volume (energy density) and manufacturing (manufacturing workload). The present invention provides a secondary battery including a sheet-shaped first-electrode-functioning base material having a function as a first electrode and a function as a base material, a front-side storage layer formed on a front side of the first-electrode-functioning base material, a front-side second electrode layer layered on the front-side storage layer, a rear-side storage layer formed on a rear side of the first-electrode-functioning base material, and a rear-side second electrode layer layered on the rear-side storage layer.

A structure with suppressed thickness and high-density when battery cells of a thin-film-solid secondary battery are stacked. Adjacent battery cells are stacked such that negative electrodes are in contact with each other and positive electrodes are in contact with each other, and arranged such that a taking-out lead electrode smaller than negative or positive electrode surfaces are sandwiched between two negative electrodes in contact with each other or two positive electrodes in contact with each other, and the lead electrodes sandwiched between electrodes of different layers are arranged such that there is no region where all of the lead electrodes simultaneously overlap one another as viewed in a planar arrangement. There are a strip-shaped lead electrode and a linear lead electrode. Further, a conductive sheet forming the electrode is extended to also serve as the taking-out electrode, thereby making it possible to reduce the number of lead electrodes.

Stacked-type secondary battery

Provided is a secondary battery adopting an all-solid-state secondary cell structure with a storage layer sandwiched between a positive electrode layer and a negative electrode layer and which is superior to a conventional secondary battery with respect to at least one of volume, manufacturing, and positioning. The present invention provides a secondary battery including a single-layer secondary cell having a folded structure that a sheet-shaped single-layer secondary cell with a storage layer sandwiched between a positive electrode layer and a negative electrode layer is folded in two or four. Here, it is preferable that a plurality of the single-layer secondary cells each having the folded structure are arranged in parallel and adjacent single-layer secondary cells each having the folded structure are electrically connected directly or via a positive electrode terminal member or a negative electrode terminal member, so that at least one of current capacity increasing and terminal voltage heightening is achieved.

Growing community of inventors

Tokyo, Japan

Shozo Izumo