US 11,108,116 B2 · Electrochemical cell separator

Abstract

The discharge performance of a primary, bobbin-style electrochemical cell is improved by incorporating a separator formed from a continuous separator sheet defining a two-layer cylindrical sidewall and a closed bottom end between the included electrochemical cell cathode and anode. A first layer of the cylindrical separator is formed by rolling a first end of a continuous separator sheet into a cylinder having a central axis parallel with a longitudinal axis of the continuous separator sheet, and then rolling a second end of the continuous separator sheet around the exterior of the first cylindrical layer to form a second cylindrical layer. The closed bottom end is formed by a portion of the continuous separator sheet located between the rolled portion of the first end and the rolled portion of the second end.

Claims16

Dependent claims

A method of manufacturing an electrochemical cell, the method comprising:

providing a cylindrical electrochemical cell can having an active material ring disposed proximate an interior surface of the cell can;
forming a cylindrical separator comprising a continuous separator sheet defining (a) a closed bottom end and (b) a two-layer cylindrical sidewall, wherein forming the cylindrical separator comprises:
providing the continuous separator sheet;
forming lateral slits perpendicular to a longitudinal axis of the continuous separator sheet to separate a first end and a second end of the continuous separator sheet;
rolling the first end to form a first cylindrical layer having a first seam;
and
rolling the second end around an exterior of the first cylindrical layer to form a second cylindrical layer having a second seam;
inserting the cylindrical separator end into the interior of the active material ring;
disposing a second active material within an interior of the separator;
and
sealing the electrochemical cell can.

8 more elements

An electrochemical cell comprising:

a container;
a ring-shaped cathode disposed within the container wherein the cathode includes an exterior surface in contact with the container and an interior surface surrounding a hollow interior;
an anode disposed within the hollow interior of the cathode;
and
a cylindrical separator positioned between the cathode and the anode, wherein the cylindrical separator comprises a continuous separator sheet defining (a) a closed bottom end, (b) a two-layer cylindrical sidewall defining a seam within each layer of the two-layer cylindrical sidewall, and (c) lateral slits perpendicular to a longitudinal axis of the continuous separator sheet, wherein the lateral slits separate a first end and a second end of the continuous separator sheet;
and
wherein the two-layer cylindrical sidewall comprises:
a first cylindrical layer formed by the first end of the continuous separator sheet;
and
a second cylindrical layer formed by the second end of the continuous separator sheet, wherein the second end of the continuous separator sheet is formed around an exterior surface of the first cylindrical layer of the two-layer cylindrical sidewall.

7 more elements

Dependencies are inferred from the claim text.

Electrochemical cell separator

Life of this patent

Electrochemical cell separator

Life of this patent

Abstract

Claims16