Cell

• US 20060127760A1
• Filed: 11/29/2005
• Published: 06/15/2006
• Est. Priority Date: 12/10/2004
• Status: Active Grant

• Current Assignee: Murata Manufacturing Co Limited
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Hatta, Kazuhito, Shibuya, Mashio
• Granted Patent: US 8,263,256 B2
• Time in Patent Office: Days
• US Class Current: 429/185
• CPC Class Codes: B29C 65/02 by heating, with or without pressure
• CPC Class Codes: B29C 65/08 using ultrasonic vibrations non-plastics element to plastics elements B29C65/645
• CPC Class Codes: B29C 65/18 using heated tools
• CPC Class Codes: B29C 66/112 Single lapped joints
• CPC Class Codes: B29C 66/1122 Single lap to lap joints, i.e. overlap joints B29C66/45, B29C66/472, B29C66/52272 take precedence
• CPC Class Codes: B29C 66/131 Single flanged joints, i.e. one of the parts to be joined being rigid and flanged in the joint area
• CPC Class Codes: B29C 66/32 Measures for keeping the burr form under control; Avoiding burr formation; Shaping the burr deburring welded articles B29C37/04
• CPC Class Codes: B29C 66/41 Joining substantially flat articles B29C66/47 and subgroups take precedence; Making flat seams in tubular or hollow articles B29C66/51 and subgroups take precedence
• CPC Class Codes: B29C 66/433 Casing-in, i.e. enclosing an element between two sheets by an outlined seam for bookbinding B42C11/06; for packaging B65B; by laminating B32B37/00; enclosing tubular articles between substantially flat elements B29C66/53261
• CPC Class Codes: B29C 66/53461 joining substantially flat covers and/or substantially flat bottoms to open ends of container bodies
• CPC Class Codes: B29C 66/549 said hollow-preforms being interconnected during their moulding process, e.g. by a hinge
• CPC Class Codes: B29C 66/71 characterised by the composition of the plastics material of the parts to be joined welding bar compositions B29C65/125
• CPC Class Codes: B29C 66/72321 consisting of metals or their alloys
• CPC Class Codes: B29C 66/7352 Thickness, e.g. very thin
• CPC Class Codes: B29C 66/81431 comprising a single cavity, e.g. a groove
• CPC Class Codes: B29C 66/83221 cooperating reciprocating tools, each tool reciprocating along one axis
• CPC Class Codes: B29K 2023/12 PP, i.e. polypropylene
• CPC Class Codes: B29K 2067/003 PET, i.e. poylethylene terephthalate
• CPC Class Codes: B29K 2077/00 Use of PA, i.e. polyamides, e.g. polyesteramides or derivatives thereof, as moulding material
• CPC Class Codes: B29K 2623/12 PP, i.e. polypropylene
• CPC Class Codes: B29K 2655/00 : Use of specific polymers obtained by polymerisation reactions only involving carbon-to-carbon unsaturated bonds, not provided for in a single one of main groups B29K2623/00 - B29K2649/00, e.g. having a vinyl group, for preformed parts, e.g. for inserts
• CPC Class Codes: B29K 2705/02 : Aluminium
• CPC Class Codes: B29L 2031/3468 : Batteries, accumulators or fuel cells battery cases B29L2031/7146
• CPC Class Codes: B29L 2031/7146 : Battery-cases
• CPC Class Codes: B32B 15/08 : of synthetic resin
• CPC Class Codes: B32B 15/085 : comprising polyolefins
• CPC Class Codes: B32B 15/088 : comprising polyamides
• CPC Class Codes: B32B 15/09 : comprising polyesters
• CPC Class Codes: B32B 15/20 : comprising aluminium or copper B32B15/016 and B32B15/017 take precedence
• CPC Class Codes: B32B 2250/03 : 3 layers
• CPC Class Codes: B32B 2255/06 : on metal layer
• CPC Class Codes: B32B 2274/00 : Thermoplastic elastomer material
• CPC Class Codes: B32B 2323/10 : Polypropylene
• CPC Class Codes: B32B 2367/00 : Polyesters, e.g. PET, i.e. polyethylene terephthalate
• CPC Class Codes: B32B 2457/10 : Batteries
• CPC Class Codes: B32B 2553/00 : Packaging equipment or accessories not otherwise provided for
• CPC Class Codes: B32B 27/32 : comprising polyolefins comprising vinyl (co)polymers or acrylic (co)polymers B32B27/30
• CPC Class Codes: B32B 27/34 : comprising polyamides
• CPC Class Codes: B32B 27/36 : comprising polyesters
• CPC Class Codes: B32B 5/142 : Variation across the area of the layer
• 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 10/052 : Li-accumulators
• 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 10/0565 : Polymeric materials, e.g. gel-type or solid-type
• CPC Class Codes: H01M 10/0568 : characterised by the solutes
• CPC Class Codes: H01M 10/0569 : characterised by the solvents
• 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 2300/0037 : Mixture of solvents
• CPC Class Codes: H01M 2300/0082 : Organic polymers
• CPC Class Codes: H01M 4/06 : Electrodes for primary cells
• CPC Class Codes: H01M 4/13 : Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
• CPC Class Codes: H01M 4/131 : Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
• CPC Class Codes: H01M 4/133 : Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
• CPC Class Codes: H01M 4/623 : fluorinated polymers
• CPC Class Codes: H01M 4/625 : Carbon or graphite
• CPC Class Codes: H01M 4/661 : Metal or alloys, e.g. alloy coatings H01M4/669 take precedence
• CPC Class Codes: H01M 50/124 : having a layered structure
• CPC Class Codes: H01M 50/126 : comprising three or more layers
• CPC Class Codes: H01M 50/133 : Thickness
• CPC Class Codes: H01M 50/141 : for protecting against humidity
• CPC Class Codes: H01M 50/178 : for pouch or flexible bag cells
• CPC Class Codes: H01M 50/417 : Polyolefins
• CPC Class Codes: H01M 50/44 : Fibrous material
• CPC Class Codes: H01M 50/46 : Separators, membranes or diaphragms characterised by their combination with electrodes
• CPC Class Codes: H01M 50/55 : on the same side 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 50/566 : by welding, soldering or brazing
• CPC Class Codes: H01M 6/02 : Details of electrodes H01M4/00; of non-active parts H01M50/00
• CPC Class Codes: H01M 6/164 : by the solvent
• CPC Class Codes: H01M 6/166 : by the solute
• CPC Class Codes: H01M 6/181 : with polymeric electrolytes
• 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 highly safety cell is provided in which short-circuiting is unlikely to occur. In order to prevent short-circuiting, for example, burrs generated when a laminate film used as an exterior packaging material is cut are prevented from penetrating an interior resin layer of the laminate film. When an electrode terminal extension side of the laminate film is thermal welded, heating and compression are performed by a heater head on a part of the laminate film apart from the edge portion thereof so that the thickness of the above edge portion is larger than that of a thermal welded portion. In addition, thermal welding is performed so that the thickness of a thermal welded portion including an electrode terminal is larger than that of a thermal welded portion including no electrode terminal, and as a result, short-circuiting can be more effectively prevented.

Claims

1. A cell comprising:

a cell element including

a positive electrode having a belt-shaped metal foil and reaction layers provided on two surfaces thereof,

a negative electrode having a belt-shaped metal foil and reaction layers provided on two surfaces thereof, and

an electrolyte;

a laminate film for packaging the cell element, having a sealing portion and being composed of an exterior resin layer, an interior resin layer, and a metal layer provided between the exterior resin layer and the interior resin layer, the sealing portion being thermal welded on a part of the laminate film apart from an edge portion thereof to form a thermal welded portion for sealing the cell; and

electrode terminals electrically connected to the cell element and extending outside through the sealing portion,

wherein a thickness t₂ of the edge portion of the laminate film is larger than a thickness t₁ of the thermal welded portion.

2. The cell according to claim 1,

wherein when the thickness of the laminate film and the thickness of the interior resin layer are represented by t and p, respectively, the following equations are satisfied:

t×

2−

p×

2+5<

t₁<

t×

2−

5 (μ

m) and
t₁<

t×

2≦

t₂ (μ

m).

3. The cell according to claim 1,

wherein the exterior resin layer includes nylon or poly(ethylene terephthalate),

the metal layer includes an aluminum foil, and

the interior resin layer includes a polyolefin resin.

4. The cell according to claim 1,

wherein the metal foil of the positive electrode is a positive electrode collector, and

the reaction layers of the positive electrode are positive electrode active material layers each including

lithium cobalt oxide,

poly(vinylidene fluoride), and

graphite.

5. The cell according to claim 1,

wherein the metal foil of the negative electrode is a negative electrode collector, and

the reaction layers of the negative electrode are negative electrode active material layers each including

poly(vinylidene fluoride), and

graphite.

6. The cell according to claim 1,

wherein the electrolyte is a gel electrolyte including a poly(vinylidene fluoride) copolymer incorporating hexafluoropropylene.

7. The cell according to claim 1,

wherein the electrolyte is an electrolyte solution including

ethylene carbonate,

propylene carbonate, and

LiPF₆.

8. The cell according to claim 1,

wherein the electrolyte is a gel electrolyte including

a poly(vinylidene fluoride) copolymer incorporating hexafluoropropylene,

ethylene carbonate,

propylene carbonate,

LiPF₆, and

dimethyl carbonate, and

the gel electrolyte is provided on two surfaces of the positive electrode and two surfaces of the negative electrode for forming gel electrolyte layers.

9. The cell according to claim 1,

wherein the cell element further includes a separator of a polyolefin material selected from one of a polypropylene resin and a polyethylene resin.

10. The cell according to claim 1,

wherein the cell element further includes a separator provided between the positive electrode and negative electrode,

the electrolyte is a gel electrolyte and is provided on two surfaces of the positive electrode and two surfaces of the negative electrode so as to form gel electrolyte layers, the gel electrolyte including

a poly(vinylidene fluoride) copolymer incorporating hexafluoropropylene,

ethylene carbonate,

propylene carbonate,

LiPF₆, and

dimethyl carbonate, and

the cell element is a winding type cell element formed by the step of winding the positive electrode provided with the two gel electrolyte layers, the negative electrode provided with the two gel electrolyte layers, and the separator provided between the positive electrode and the negative electrode in a longitudinal direction.

11. The cell according to claim 1, further comprising:

sealant layers provided on two surfaces of each of the electrode terminals,

wherein the cell element further includes a separator provided between the positive electrode and negative electrode,

the electrolyte is a gel electrolyte and is provided on two surfaces of the positive electrode and two surfaces of the negative electrode so as to form gel electrolyte layers, the gel electrolyte including

a poly(vinylidene fluoride) copolymer incorporating hexafluoropropylene,

ethylene carbonate,

propylene carbonate,

LiPF₆, and

dimethyl carbonate,

the cell element is a winding type cell element formed by the step of winding the positive electrode provided with the two gel electrolyte layers, the negative electrode provided with the two gel electrolyte layers, and the separator provided between the positive electrode and the negative electrode in a longitudinal direction, and

the winding type cell element is packaged in the laminate film by thermal welding under vacuum conditions.

12. A cell comprising:

a cell element including

a positive electrode having a belt-shaped metal foil and reaction layers provided on two surfaces thereof,

a negative electrode having a belt-shaped metal foil and reaction layers provided on two surfaces thereof, and

an electrolyte;

a laminate film for packaging the cell element, having a sealing portion and being composed of an exterior resin layer, an interior resin layer, and a metal layer provided between the exterior layer and the interior resin layer, the sealing portion being thermal welded to form thermal welded portions for sealing the cell; and

electrode terminals electrically connected to the cell element and extending outside through the sealing portion,

wherein a thickness t₄ of thermal welded portions including the electrode terminals is larger than a thickness t₃ of thermal welded portions including no electrode terminals.

13. The cell according to claim 12, further comprising:

resin material layers covering the electrode terminals,

wherein when the thicknesses of the laminate film, the interior resin layer of the laminate film, the electrode terminal, and one side of each of the resin material layers covering the electrode terminals are represented by t, p, L, and S, respectively, the following equations are satisfied;

20<

p<

40 (μ

m),
t×

2−

p×

2+5<

t₃<

t×

2−

5 (μ

m), and
t×

2−

p×

2+5+(L+S)<

t₄<

t×

2−

5+(L+S) (μ

m)