Thin power storage device and production method thereof

Patent metadata

Field	Value
Publication number	US-2018323410-A1
Application number	US-201816033247-A
Country	US
Kind code	A1
Filing date	Jul 12, 2018
Priority date	Aug 18, 2014
Publication date	Nov 8, 2018
Grant date	—

Abstract

A power storage device includes a positive electrode part including a first metallic foil layer and a positive electrode active material layer partially laminated on one surface of the first metallic foil layer, a negative electrode part including a second metallic foil layer and a negative electrode active material layer partially laminated on one surface of the second metallic foil layer, and a separator arranged between the positive electrode part and the negative electrode part. The positive electrode active material layer is arranged between the first metallic foil layer and the separator, and the negative electrode active material layer is arranged between the second metallic foil layer and the separator. The peripheral regions of the one surfaces of the first and second metallic foil layers in which the positive and negative electrode active material layers are not formed are joined via a peripheral sealing layer containing a thermoplastic resin.

First claim

1 . A production method of a thin power storage device, comprising:
a step of preparing a positive electrode side sheet body including a first metallic foil layer, a positive electrode active material layer laminated on a partial region of one surface of the first metallic foil layer, and a first thermoplastic resin layer provided at a peripheral portion of the one surface of the first metallic foil layer on which the positive electrode active material layer is not formed; a step of preparing a negative electrode side sheet body including a second metallic foil layer, a negative electrode active material layer laminated on a partial region of one surface of the second metallic foil layer, and a second thermoplastic resin layer provided at a peripheral portion of the one surface of the second metallic foil layer on which the negative electrode active material layer is not formed; a step of preparing a separator; and a step of heat-sealing the first thermoplastic resin layer of the positive electrode side sheet body and the second thermoplastic resin layer of the negative electrode side sheet body in a state in which the positive electrode side sheet body and the negative electrode side sheet body are in contact with each other via respective thermoplastic resin layers and the separator is sandwiched by and between the positive electrode active material layer and the negative electrode active material layer.

2 . The production method of a thin power storage device as recited in claim 1 ,
wherein the first thermoplastic resin layer is formed by a thermoplastic resin unstretched film and the second thermoplastic resin layer is formed by a thermoplastic resin unstretched film.

Assignees

• Showa Denko Packaging Co Ltd

Inventors

• Minamitani Koji
• Minamibori Yuji
• Nagata Kensuke
• Saito Shunsuke

Classifications

• B32B7/05

  the layers not being connected over the whole surface, e.g. discontinuous connection or patterned connection (using interposed adhesives or bonding materials applied in spaced arrangements B32B7/14) · CPC title

• B32B37/06

  characterised by the heating method · CPC title

• B32B27/06

  as the main or only constituent of a layer, {which is} next to another layer of {the same or of} a {different material (next to a layer of a particular substance B32B9/045; next to a bituminous or tarry layer B32B11/046; next to a water setting substance layer B32B13/12; next to a metal layer B32B15/08; next to a glass layer B32B17/10; next to a layer formed of natural mineral fibres or particles B32B19/045; next to a wood layer B32B21/08; next to a cellulosic plastic layer B32B23/08; next to a natural or synthetic rubber layer B32B25/08)} · CPC title

• B32B2311/22

  Nickel or cobalt · CPC title

• B32B15/18

  comprising iron or steel {(B32B15/011, B32B15/012 and B32B15/013 take precedence)} · CPC title