Coiled lithium battery

• US 5,017,442 A
• Filed: 03/17/1989
• Issued: 05/21/1991
• Est. Priority Date: 03/19/1988
• Status: Expired due to Term

• Current Assignee: Hitachi Maxell Limited (Maxell, Ltd.)
• Original Assignee: Hitachi Maxell Limited (Maxell, Ltd.)
• Inventors: Edamoto, Toshiyuki, Kitamura, Tomio, Kajii, Osamu, Yoshida, Hiroshi, Watanabe, Osamu, Somatomo, Yoshiki, Hisatomi, Kaoru
• Primary Examiner(s): Kalafut, Stephen J.
• Application Number:
  US07/324,737
• Time in Patent Office: 795 Days
• Field of Search: 429/94, 429/241
• US Class Current: 429/94
• CPC Class Codes: H01M 4/74 Meshes or woven material; Expanded metal
• CPC Class Codes: H01M 6/10 with wound or folded electrodes
• CPC Class Codes: H01M 6/16 with organic electrolyte H01M6/18 takes precedence

Abstract

In a coil type lithium battery comprising a coil electrode body formed by winding a strip like negative electrode plate of lithium or lithium alloy and strip like positive electrode about a separator, the entire outer cylindrical surface of the coil of the electrode body is covered with an insulating film to prevent internal short circuiting of the battery.

Claims

1. A coil type lithium battery having a coil electrode body comprising a strip-like negative electrode plate of lithium or lithium alloy, a strip-like positive electrode, a separator interposed between said negative electrode plate and said positive electrode, and an insulating film over the entire outer cylindrical surface of said coiled electrode body extending onto a bottom surface of said electrode body inclusive of a peripheral, lower edge portion thereof.

2. The battery according to claim 1, wherein said insulating film is selected from one member of the group consisting of a polyolefin film, polytetrafluoroethylene film and a polyester film.

3. A coil type lithium battery having a coil electrode body comprising a strip-like negative electrode plate of lithium or lithium alloy, a strip-like positive electrode plate, and a separator interposed therebetween, said strip-like positive electrode plate consisting of a charge collecting plane woven mesh of a plurality of longitudinal wires and a plurality of lateral wires and a positive electrode mix containing electrode active material held on said charge collecting mesh, said longitudinal wires and lateral wires heat bonded together at their crossing points.

4. The battery according to claim 3, wherein said plane woven mesh is formed of wires of from 0.05 to 0.10 mm in diameter, with a distance between said wires of from 0.25 to 1.2 mm.