Nonaqueous electrolyte battery sealed in a film case

• US 6,475,668 B1
• Filed: 12/15/2000
• Issued: 11/05/2002
• Est. Priority Date: 12/17/1999
• Status: Expired due to Fees

• Current Assignee: Sumitomo Electric Industries Limited (Sumitomo Corporation)
• Original Assignee: Sumitomo Electric Industries Limited (Sumitomo Corporation)
• Inventors: Tanaka, Keiichi, Hosokawa, Takehiro
• Primary Examiner(s): Chaney, Carol
• Assistant Examiner(s): YUAN, DAH WEI D
• Application Number:
  US09/736,396
• Publication Number:
  US 20020164525A1
• Time in Patent Office: 690 Days
• Field of Search: 491/63, 491/67, 491/70
• US Class Current: 429/163
• CPC Class Codes: B32B 15/08 of synthetic resin
• CPC Class Codes: H01M 10/052 Li-accumulators
• 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 50/124 having a layered structure
• CPC Class Codes: H01M 50/129 with two or more layers of only organic material
• 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 50/55 on the same side of the cell
• CPC Class Codes: H01M 50/553 Terminals adapted for prismatic, pouch or rectangular cells
• CPC Class Codes: 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 film case forming a nonaqueous electrolyte battery of this invention is formed by a packaging film including an engineering plastic layer, at least one metallic layer laminated inside the engineering plastic layer, at least one acid resistant layer laminated inside the metallic layer, and at least one water-proof thermoplastic polymer layer laminated inside the acid resistant layer. The acid resistant layer contains a thermoplastic polymer and at least one a metal compound, selected from the group consisting of magnesium oxide and hydrotalcites, in an amount of about 2 parts by weight to about 25 parts by weight with respect to 100 parts by weight of the thermoplastic polymer.

Claims

1. A nonaqueous electrolyte battery comprising:

a film case;

an anode, a cathode, and an electrolyte solution sealed in said film case;

an anode lead wire whose one end is connected to said anode and other end projects outside said film case; and

a cathode lead wire whose one end is connected to said cathode and other end projects outside said film case,

wherein said film case is formed by laminating two packaging films, each packaging film comprising an engineering plastic layer, a water-proof thermoplastic polymer layer, and interposing layers between the engineering plastic layer and the water-proof thermoplastic polymer layer, said interposing layers comprising at least one metallic layer, at least one acid resistant layer, and optionally at least one water-proof thermoplastic layer, and

said acid resistant layer contains a thermoplastic polymer and at least one metal compound, selected from the group consisting of magnesium oxide and hydrotalcites, in an amount of about 2 parts by weight to about 25 parts by weight with respect to 100 parts by weight of said thermoplastic polymer,

wherein said hydrotalcites are compounds represented by the following formula;

2. A battery according to claim 1, wherein the thickness of said acid resistant layer is about 10 μ

m to about 50 μ

m.

3. A battery according to claim 1, wherein the average particle diameter of said metal compound is about 0.01 μ

m to about 5 μ

m.

4. A battery according to claim 1, wherein a thermoplastic polymer layer forming said acid resistant layer is made from at least one thermoplastic polymer selected from the group consisting of polyethylene, polypropyrene, a polyethylene acid modified product, a polypropyrene acid modified product, a polyethylene ionomer, and a polypropyrene ionomer.