Current collection through the ends of a spirally wound electrochemical cell
First Claim
1. In an electrochemical cell which includes an electrode stack comprised of alternating conductive and insulating layers, said conductive and insulating layers extending in a first direction, wherein at least a first layer extends in said first direction from a first end of said stack, the improvement comprising:
- a tab connection portion comprising at least a section of said first layer which is folded so as to extend in a direction substantially transverse to said first direction; and
a current collection tab, having a longitudinal axis, connected to said tab connection portion such that said tab longitudinal axis extends in a direction substantially transverse to said first direction.
4 Assignments
0 Petitions
Accused Products
Abstract
An electrochemical cell, including a jelly-roll type electrode stack, and a method for making such cell. The electrochemical cell includes folded electrode portions which form a plane recessed from the end of the electrode stack. The folded electrode portions are preferably formed by making pairs of slits in the electrode end and bending over the electrode portions between each pair of slits. The recessed plane forms a large area to which a current collection tab is subsequently connected. A coating may be applied to the folded portions of the electrode to further increase the contact area with the current collection tab by eliminating the slight variations in the recessed plane which are due to the overlap of the folded electrode portions.
24 Citations
26 Claims
-
1. In an electrochemical cell which includes an electrode stack comprised of alternating conductive and insulating layers, said conductive and insulating layers extending in a first direction, wherein at least a first layer extends in said first direction from a first end of said stack, the improvement comprising:
-
a tab connection portion comprising at least a section of said first layer which is folded so as to extend in a direction substantially transverse to said first direction; and a current collection tab, having a longitudinal axis, connected to said tab connection portion such that said tab longitudinal axis extends in a direction substantially transverse to said first direction. - View Dependent Claims (26)
-
-
2. In an electrochemical cell which includes a jelly-roll type electrode stack comprised of alternating conductive and insulating layers, said electrode stack having a longitudinal axis, wherein at least a first layer comprises a spiral electrode and extends from a first end of said stack, the improvement comprising:
a tab connection portion including portions of first spiral electrode that are folded so as to extend in a radial direction. - View Dependent Claims (3, 4)
-
5. An electrochemical cell comprising:
-
a first conductive sheet having a first end and a second end opposite to said first end; insulation adjacent to said first conductive sheet so that said second end of said first conductive sheet is uncovered by said insulation; a second conductive sheet having a first end, and a second end opposite to said first end of said second conductive sheet, wherein said second conductive sheet is adjacent said insulation so that said second end of said second conductive sheet is uncovered by said insulation and extends beyond said first end of said first conductive sheet; a tab connection portion, wherein said tab connection portion includes at least one first conductive sheet section that is folded so as to extend across said insulation toward said second conductive sheet. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
-
Specification