THIN POWER STORAGE DEVICE AND PRODUCTION METHOD THEREOF

• US 20160049625A1
• Filed: 08/18/2015
• Published: 02/18/2016
• Est. Priority Date: 08/18/2014
• Status: Active Grant

• Current Assignee: Resonac Packaging Corporation (Resonac Holdings Corp.)
• Original Assignee: Showa Denko Packaging Co., Ltd. (Resonac Holdings Corp.), Showa Denko KK
• Inventors: MINAMITANI, Koji, MINAMIBORI, Yuji, NAGATA, Kensuke, SAITO, Shunsuke
• Granted Patent: US 10,079,374 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: B29C 65/02 by heating, with or without pressure
• CPC Class Codes: B29C 66/43 Joining a relatively small portion of the surface of said articles B29C66/45 takes precedence
• CPC Class Codes: B29K 2705/00 Use of metals, their alloys or their compounds, for preformed parts, e.g. for inserts
• CPC Class Codes: B29L 2031/3468 Batteries, accumulators or fuel cells battery cases B29L2031/7146
• CPC Class Codes: B32B 15/08 of synthetic resin
• CPC Class Codes: B32B 15/18 comprising iron or steel B32B15/011, B32B15/012 and B32B15/013 take precedence
• CPC Class Codes: B32B 15/20 comprising aluminium or copper B32B15/016 and B32B15/017 take precedence
• CPC Class Codes: B32B 2307/202 Conductive
• CPC Class Codes: B32B 2307/206 Insulating
• CPC Class Codes: B32B 2307/306 Resistant to heat
• CPC Class Codes: B32B 2307/518 bi-axially
• CPC Class Codes: B32B 2307/714 Inert, i.e. inert to chemical degradation, corrosion
• CPC Class Codes: B32B 2311/00 Metals, their alloys or their compounds
• CPC Class Codes: B32B 2311/12 Copper
• CPC Class Codes: B32B 2311/22 Nickel or cobalt
• CPC Class Codes: B32B 2311/24 Aluminium
• CPC Class Codes: B32B 2311/30 Iron, e.g. steel
• CPC Class Codes: B32B 2398/00 Unspecified macromolecular compounds
• CPC Class Codes: B32B 2457/10 Batteries
• CPC Class Codes: B32B 27/06 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 Class Codes: B32B 27/08 : of synthetic resin
• CPC Class Codes: B32B 27/304 : comprising vinyl halide (co)polymers, e.g. PVC, PVDC, PVF, PVDF
• CPC Class Codes: B32B 27/34 : comprising polyamides
• CPC Class Codes: B32B 27/36 : comprising polyesters
• CPC Class Codes: B32B 37/06 : characterised by the heating method
• CPC Class Codes: B32B 37/185 : Laminating sheets, panels or inserts between two discrete plastic layers
• CPC Class Codes: B32B 7/05 : 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 Class Codes: B32B 7/12 : using interposed adhesives or interposed materials with bonding properties
• CPC Class Codes: H01M 10/0431 : Cells with wound or folded electrodes H01M10/045 takes precedence
• CPC Class Codes: H01M 10/0436 : Small-sized flat cells or batteries for portable equipment
• CPC Class Codes: H01M 10/0525 : Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
• CPC Class Codes: H01M 10/0585 : of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators
• CPC Class Codes: H01M 10/0587 : of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
• CPC Class Codes: H01M 2220/30 : Batteries in portable systems, e.g. mobile phone, laptop
• CPC Class Codes: H01M 50/105 : Pouches or flexible bags
• CPC Class Codes: H01M 50/548 : on opposite sides of the cell
• CPC Class Codes: H01M 50/553 : Terminals adapted for prismatic, pouch or rectangular cells
• CPC Class Codes: H01M 50/562 : characterised by the material
• CPC Class Codes: H01M 6/40 : Printed batteries , e.g. thin film batteries
• CPC Class Codes: Y02E 60/10 : Energy storage using batteries
• CPC Class Codes: Y02P 70/50 : Manufacturing or production processes characterised by the final manufactured product

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.

Claims

1. A thin power storage device comprising:

a positive electrode part including a first metallic foil layer and a positive electrode active material layer laminated on a partial region of 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 laminated on a partial region of one surface of the second metallic foil layer; and

a separator arranged between the positive electrode part and the negative electrode part,

wherein 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, and

wherein a peripheral region of the one surface of the first metallic foil layer of the positive electrode part in which the positive electrode active material layer is not formed and a peripheral region of the one surface of the second metallic foil layer of the negative electrode part in which the negative electrode active material layer is not formed are joined via a peripheral sealing layer containing a thermoplastic resin.

2. The thin power storage device as recited in claim 1,

wherein a first insulation resin film is laminated on the other surface of the first metallic foil layer in a manner such that a first metal exposed portion in which the first metallic foil layer is exposed remains, and

wherein a second insulation resin film is laminated on the other surface of the second metallic foil layer in a manner such that a second metal exposed portion in which the second metallic foil layer is exposed remains.

3. The thin power storage device as recited in claim 2, wherein the first insulation resin film and the second insulation resin film are each formed by a heat-resistant resin stretched film.

4. The thin power storage device as recited in claim 1,

wherein the positive electrode active material layer is laminated on the one surface of the first metallic foil layer via a first binder layer, and the negative electrode active material layer is laminated on the one surface of the second metallic foil layer via a second binder layer, and

wherein the first binder layer and the second binder layer are each made of at least one binder material selected from the group consisting of polyvinylidene fluoride, styrene-butadiene rubber, carboxymethyl cellulose sodium salt, and polyacrylonitrile.

5. The thin power storage device as recited in claim 1, wherein the peripheral sealing layer is formed by a thermoplastic resin unstretched film.

6. The thin power storage device as recited in claim 1,

wherein an electrolyte is encapsulated between the separator and the positive electrode active material layer, and

wherein an electrolyte is encapsulated between the separator and the negative electrode active material layer.

7. The thin power storage device as recited in claim 1,

wherein the first metallic foil layer is formed by an aluminum foil, and

wherein the second metallic foil layer is formed by an aluminum foil, a copper foil, a stainless steel foil, a nickel foil or a titanium foil.

8. The thin power storage device as recited in claim 1,

wherein a first chemical conversion film is formed at least on a surface of the first metallic foil layer to which the positive electrode active material layer is laminated, and

wherein a second chemical conversion film is formed at least on a surface of the second metallic foil layer to which the negative electrode active material layer is laminated.

9. 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.

10. The production method of a thin power storage device as recited in claim 9,

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.