Non-aqueous electrolyte cell

• US 6,296,971 B1
• Filed: 10/21/1999
• Issued: 10/02/2001
• Est. Priority Date: 10/30/1998
• Status: Expired due to Term

• Current Assignee: Murata Manufacturing Co Limited
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Hara, Tomitaro
• Primary Examiner(s): Brouillette, Gabrielle
• Assistant Examiner(s): Alejandro, Raymond
• Application Number:
  US09/422,251
• Time in Patent Office: 712 Days
• Field of Search: 429/163, 429/176, 429/175, 429/185, 429/153, 429/127
• US Class Current: 429/163
• 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 50/119 Metals
• CPC Class Codes: H01M 50/121 Organic material
• CPC Class Codes: H01M 50/124 having a layered structure
• CPC Class Codes: H01M 50/133 Thickness
• CPC Class Codes: H01M 50/141 for protecting against humidity
• CPC Class Codes: H01M 50/55 on the same side of the cell
• CPC Class Codes: H01M 50/557 Plate-shaped terminals
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

Abstract

A non-aqueous electrolyte cell having high hermetic sealing and hermetic sealing properties and which is reduced in thickness. A unit cell of the non-aqueous electrolyte cell is accommodated in a packaging material formed by a laminated film. The packaging material includes at least a metal layer and a heat fused layer arranged on an inner side of the meta layer. The heat fused layer is made up of a plurality of layers each containing the same monomeric unit. A mixed layer where plastic materials of the plural layers co-exist is formed between the plural layers such that the heat fused layer is in the form of a continuous film not having a definite boundary surface.

Claims

1. A non-aqueous electrolyte cell in which a unit cell is accommodated in a packaging material formed by a laminated film, wherein

said packaging material includes at least a metal layer and a heat fused layer arranged inwardly thereof;

said heat fused layer being made up of a plurality of layers each containing a same monomeric unit,

wherein an innermost one of the plural layers of the heat fused layer is formed of a plastic material having a dynamic viscoelasticity within 5°

C. from a melting point of the plastic material that is 15% or less.

2. The non-aqueous electrolyte cell according to claim 1 wherein a mixed layer where plastic materials of said plural layers co-exist is formed between said plural layers such that said heat fused layer is in the form of a continuous film.

3. The non-aqueous electrolyte cell according to claim 2 wherein said beat fused layer has a thickness of 20 to 40 μ

m.

4. The non-aqueous electrolyte cell according to claim 1 wherein said heat fused layer includes a layer of a plastic material such that, if a film 25 μ

m in thickness, formed of said plastic material, is placed for 24 hours in an environment of the temperature of 40 C. and a RH of 90%, the layer transmits steam in an amount of 10g/m² or less.

5. The non-aqueous electrolyte cell according to claim 1 wherein said layer is made up of a polypropylene or propylene copolymer containing propylene as a monomeric unit.

6. The non-aqueous electrolyte cell according to claim 5 wherein said propylene copolymer contains ethylene as a copolymer component.

7. The non-aqueous electrolyte cell according to claim 1 wherein the electrolyte of the unit cell is a gel electrolyte or a solid electrolyte containing lithium salts and a matrix high molecular weight polymer.

8. The non-aqueous electrolyte cell according to claim 1 wherein the negative electrode of the unit cell contains a material capable of doping/undoping lithium.

9. The non-aqueous electrolyte cell according to claim 8 wherein the material capable of doping/undoping lithium is a carbon material.

10. The non-aqueous electrolyte cell according to claim 1 wherein the positive electrode of the unit cell contains a compound oxide of lithium and a transition metal.