Anode design for a prismatically wound LiMnO2 cell

• US 20050196667A1
• Filed: 03/03/2004
• Published: 09/08/2005
• Est. Priority Date: 03/03/2004
• Status: Abandoned Application

• Current Assignee: Eaglepicher Technologies LLC (Eaglepicher Corporation)
• Original Assignee: Eaglepicher Technologies LLC (Eaglepicher Corporation)
• Inventors: Brand, Christo
• Application Number:
  US10/792,242
• Publication Number:
  US 20050196667A1
• Time in Patent Office: Days
• US Class Current: 429/130
• CPC Class Codes: H01M 10/0431 Cells with wound or folded electrodes H01M10/045 takes precedence
• CPC Class Codes: H01M 10/052 Li-accumulators
• CPC Class Codes: H01M 10/0587 of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
• CPC Class Codes: H01M 2004/027 Negative electrodes
• CPC Class Codes: H01M 4/505 of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy
• CPC Class Codes: H01M 4/75 Wires, rods or strips
• CPC Class Codes: H01M 50/103 prismatic or rectangular H01M50/109, H01M50/11 take precedence
• CPC Class Codes: H01M 50/531 Electrode connections inside a battery casing
• 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: H01M 50/586 inside the batteries, e.g. incorrect connections of electrodes
• CPC Class Codes: H01M 50/595 Tapes
• 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 prismatic cell for implantable medical devices includes an elongated anode and cathode folded together to form a prismatic cell. The anode includes an anode tab which does not extend to the bottom edge of the anode, with heat-resistant tape on the opposite side of the anode, likewise not extending to the bottom edge of the anode. This provides a strip of anode material below the anode tab which acts as a current collector reducing the increase in impedance as the cell is discharged.

Claims

1. A prismatic cell having

an elongated anode having a long axis;

an elongated cathode having a long axis;

a separator between said anode and said cathode wherein said anode and cathode are folded together separated by said separator, said cell having two long sides and two narrow sides;

an anode tab attached to a first side of said anode; and

insulation tape attached to a second side of said anode opposite said anode tab wherein a bottom edge of said tab is above a bottom edge of said anode and a bottom edge of said insulation tape is above said bottom edge of said anode.

2. The prismatic cell claimed in claim 1 wherein said prismatic cell is folded into a spiral.

3. The prismatic cell claimed in claim 1 wherein said prismatic cell is folded in a serpentine configuration.

4. The prismatic cell claimed in claim 1 wherein said anode further comprises a metal wire extended along the long axis of said anode.

5. The prismatic cell claimed in claim 1 wherein said anode is lithium.

6. The prismatic cell claimed in claim 1 wherein said tape extends from about 0.15 to about 0.25 inches from said bottom edge of said anode.

7. The prismatic cell claimed in claim 1 having a metal casing wherein said casing has two long sides and two narrow sides and a bottom, and said anode tab is welded to one of said long sides.