Monaqueous electrolyte battery

• US 5,354,629 A
• Filed: 10/09/1992
• Issued: 10/11/1994
• Est. Priority Date: 10/09/1991
• Status: Expired due to Term

• Current Assignee: FDK Corporation (Fujitsu Limited)
• Original Assignee: Sanyo Electric Company Limited (Panasonic Holdings Corporation)
• Inventors: Yokoyama, Yuichi, Kuroda, Akira, Yamano, Atsushi, Narukawa, Satoshi
• Primary Examiner(s): TSANG, CECILIA J
• Application Number:
  US07/959,128
• Time in Patent Office: 732 Days
• Field of Search: 429/94, 429/161, 429/211
• US Class Current: 429/94
• CPC Class Codes: H01M 2200/00 Safety devices for primary or secondary batteries
• CPC Class Codes: H01M 50/531 Electrode connections inside a battery casing
• CPC Class Codes: H01M 50/534 characterised by the material of the leads or tabs
• CPC Class Codes: H01M 50/536 characterised by the method of fixing the leads to the electrodes, e.g. by welding
• CPC Class Codes: H01M 6/10 with wound or folded electrodes

Abstract

The nonaqueous electrolyte battery of this invention is provided with a spiral electrode unit comprising a separator laminated between a cathode and an anode rolled into a spiral shape having anode around the outer perimeter. An anode terminal tab disconnects from the outermost one circumference of anode residue after discharge to prevent residual anode deposition on the cathode when power is overdrawn.

Claims

1. A nonaqueous electrolyte battery comprising

a spiral shaped electrode unit including:

a belt shaped cathode;

a belt shaped anode laminated on said cathode and adapted to be reduced in volume during a discharge reaction;

a separator laminated between said cathode and said anode;

wherein said cathode, said anode and said separator are rolled into a spiral shape, such that an outermost turn of said anode is located outwardly of an outermost turn of said cathode;

wherein an outermost end of said cathode protrudes circumferentially beyond an outermost end of said anode in an outwardly spiralling direction; and

wherein an anode terminal tab is connected to said anode at a position located at least one full turn of said anode from said outermost end of said anode in an inwardly spiralling direction.

2. A nonaqueous electrolyte battery as recited in claim 1, wherein

said electrode unit further includes an ion impervious insulator material disposed on a radially inwardly facing surface of said anode at a position along said anode opposite said outermost end of said cathode.

3. A nonaqueous electrolyte battery as recited in claim 1, further comprising

an exterior package containing said electrode unit;

wherein said exterior package acts as an anode terminal;

wherein said anode terminal tab is disposed on a radially inwardly facing surface of said anode;

wherein said anode terminal tab is insulated from an outermost turn of said anode; and

wherein said anode terminal pad includes an end portion which is extended away from said anode, said end portion of said anode terminal pad being connected with said exterior package at a location at which said cathode is not present at an outer periphery of said electrode unit.

4. A nonaqueous electrolyte battery as recited in claim 3, wherein

said anode terminal pad is L-shaped.

5. A nonaqueous electrolyte battery comprising

a spiral shaped electrode unit including:

a belt shaped cathode;

a belt shaped anode laminated on said cathode and adapted to be reduced in volume during a discharge reaction;

a separator laminated between said cathode and said anode;

wherein said cathode, said anode and said separator are rolled into a spiral shape, such that an outermost turn of said anode is located outwardly of an outermost turn of said cathode;

wherein an anode terminal tab is connected to said anode at a position located at least one full turn of said anode from an outermost end of said anode in an inwardly spiralling direction;

wherein an end portion of said anode terminal tab is connected to said anode but is otherwise insulated from said anode by an insulating material; and

wherein a terminal separating hole, larger than a width of said anode terminal tab, is formed through said anode at a position at a boundary of said insulating material and adjacent the location where said anode terminal pad connects with said anode.

6. A nonaqueous electrolyte battery as recited in claim 5, wherein

said anode terminal pad is L-shaped.