Battery with a spiral electrode unit
AssigneeSanyo Electric Co., Ltd.
InventorsSatoshi Narukawa, Toru Amazutsumi, Kazuro Moriwaki
Life of this patent
Estimating the term…
Abstract
Novel lead location and winding configuration allow more efficient spiral electrode fabrication for a battery that is less susceptible to internal short circuits. The battery has separator material sandwiched between positive and negative electrode strips, which are rolled into a spiral electrode unit. The electrodes have active material that covers a core except in regions where leads are attached. One lead is positioned at the outermost winding, and both sides of each lead face either separator material only or the same polarity electrode via separator material. A special lead taping processing step is eliminated.
Claims22
A battery comprising:
- a spiral electrode unit with leads established at exposed regions of conducting electrode core material, including
- (1) a positive electrode strip which is conducting core material covered with active material;
- (2) a negative electrode strip which is conducting core material covered with active material, and which is laminated with the positive electrode strip via a separator;
- and characterized in that
- (1) regions of electrodes of the same polarity reside via the separator on both sides of the exposed regions of electrode core material, where leads are established;
- and
- (2) one of the leads is positioned at the outermost winding of the spiral electrode unit.
A battery comprising:
- a spiral electrode unit with leads established at exposed regions of conducting electrode core material, including
- (1) a positive electrode strip which is conducting core material covered with active material;
- (2) a negative electrode strip which is conducting core material covered with active material, and which is laminated with the positive electrode strip via a separator;
- and characterized in that
- (1) separator material resides on both sides of the exposed regions of electrode core material, where leads are established, and still more separator resides outside that separator material;
- and
- (2) one of the leads is positioned at the outermost winding of the spiral electrode unit.
Dependencies are inferred from the claim text.