Nonaqueous electrolyte battery

• US 6,399,241 B1
• Filed: 10/21/1999
• Issued: 06/04/2002
• Est. Priority Date: 10/23/1998
• Status: Expired due to Term

• Current Assignee: Murata Manufacturing Co Limited
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Hara, Tomitaro, Hatazawa, Tsuyonobu, Hatsuta, Kazuhito
• Primary Examiner(s): Brouillette, Gabrielle
• Assistant Examiner(s): Martin, Angela J
• Application Number:
  US09/421,936
• Time in Patent Office: 957 Days
• Field of Search: 429/163, 429/162, 429/171, 429/124, 429/127, 429/131, 429/132
• 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 50/122 Composite material consisting of a mixture of organic and inorganic materials
• CPC Class Codes: H01M 50/126 comprising three or more layers
• CPC Class Codes: H01M 50/131 characterised by physical properties, e.g. gas permeability, size or heat resistance
• CPC Class Codes: H01M 50/133 Thickness
• 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
• CPC Class Codes: Y02P 70/50 Manufacturing or production processes characterised by the final manufactured product

Abstract

It is an object to quickly disperse heat generated when short circuit occurs between a positive electrode and a negative electrode. A nonaqueous-electrolyte battery is disclosed which incorporates: an encapsulating medium constituted by a laminated film in which a unit cell is accommodated, wherein the laminated film of the encapsulating medium contains a metal material having a heat conductivity k at room temperatures which is 230 Wm⁻¹K⁻¹ or higher. Moreover, ratio R of the volume of the metal material portion of the encapsulating medium with respect to a capacity of 1 mAh of the unit cell is 0.0002 cm³/mAh≦R≦0.003 cm³/mAh.

Claims

1. A nonaqueous-electrolyte battery comprising:

an encapsulating medium constituted by a laminated film in which a unit cell is accommodated, wherein

said laminated film of said encapsulating medium contains a metal material having a heat conductivity k at room temperatures which is 230 Wm<sup>−

1</sup>K<sup>−

1</sup> or higher and having a thickness that ranges from about 30 micrometers to about 50 micrometers.

2. A nonaqueous-electrolyte battery according to claim 1, wherein ratio R of the volume of the metal material portion of the encapsulating medium with respect to a capacity of 1 mAh of the unit cell is 0.0002 cm³/mAh≦

R≦

0.05 cm³/mAh.

3. A nonaqueous-electrolyte battery according to claim 1, wherein a collector of a positive electrode and/or a negative electrode constituting said unit cell is made of a metal material having a heat conductivity k at room temperatures which is 230 Wm⁻

1K<sup>−

1</sup> or higher.

4. A nonaqueous-electrolyte battery according to claim 1, wherein an electrolyte constituting said unit cell is a gel electrolyte or a solid electrolyte containing matrix polymer and lithium salt.

5. A nonaqueous-electrolyte battery according to claim 1, wherein said negative electrode constituting said unit cell is a negative electrode containing a material which is able to dope/dedope lithium.

6. A nonaqueous-electrolyte battery according to claim 5, wherein said material which is able to dope/dedope lithium is a carbon material.

7. A nonaqueous-electrolyte battery according to claim 1, wherein said positive electrode constituting said unit cell is a positive electrode containing composite oxide of lithium and transition metal.

8. A nonaqueous-electrolyte battery comprising:

a unit cell and an encapsulating medium that encapsulates the unit cell;

the unit cell comprising a positive electrode and a negative electrode each laminated onto a solid electrolyte wherein the unit cell forms a winding structure;

the encapsulating medium comprising a laminated film which includes a metal material having a heat conductivity k at room temperature ranging from 230 Wm<sup>−

1</sup>K<sup>−

1</sup> or higher and having a thickness that ranges from about 30 micrometers to about 50 micrometers.

9. The nonaqueous-electrolyte battery of claim 8 wherein the positive electrode, the negative electrode or both have a collector to disperse heat that is generated in the unit cell.

10. The nonaqueous-electrolyte battery of claim 9 wherein the collector is a metal material.

11. The nonaqueous-electrolyte battery of claim 10 wherein the metal material is selected from the group consisting of aluminum, copper, nickel, stainless steel or combinations thereof.

12. The nonaqueous-electrolyte battery of claim 10 wherein the metal material has a heat conductivity k at room temperature ranging from 230 Wm⁻

1K<sup>−

1</sup> or higher.

13. The nonaqueous-electrolyte battery of claim 10 wherein the metal material has a thickness ranging from 10 micrometers to 100 micrometers.

14. The nonaqueous-electrolyte battery of claim 9 wherein the collector of the positive electrode comprises a thin metal film composed of aluminum.

15. The nonaqueous-electrolyte battery of claim 9 wherein the collector of the negative electrode comprises a thin film metal composed of copper.