Electrochemical cell with improved internal contact
First Claim
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1. An electrochemical cell, comprising:
- a substantially round, cylindrical container comprising a conductive material, said container having;
a closed end with a negative terminal, an open end sealed by an end assembly that is electrically insulated from the container and has a positive terminal and a sidewall extending between the closed end and the open end;
a nonaqueous, organic electrolyte;
a jellyroll electrode assembly comprising a positive electrode, a separator and a negative electrode consisting essentially of lithium or a lithium alloy of at least 90 wt. % lithium and having a length, a width and a cumulative surface area;
an internal lead connected to less than 0.7% of the cumulative surface area of the negative electrode at an edge of the negative electrode that is proximate to the closed end of the container;
wherein the lead extends a distance across the negative electrode measured along a longitudinal axis of the electrode assembly from the edge of the negative electrode that is greater than 10% and less than 88% of the width of the negative electrode;
wherein a portion of the lead is folded and extends upward to make electrical contact with the container sidewall by pressure only, said portion of the lead having an integrally formed groove to bias the lead against the sidewall; and
wherein the maximum difference between the container inside diameter and the electrode assembly diameter is defined by one equation selected from the group consisting of;
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Abstract
Electrochemical battery cells with strip-like electrodes and having a pressure contact between a lead from one of the electrodes and a sidewall of the cell container. An electrochemical cell having a spiral wound electrode assembly having an internal lead in direct pressure contact with a lithium foil negative electrode free of a separate current collector and in contact with an inner portion of the cell container, wherein specified contact between the lead and lithium foil provides current flow between the container and foil.
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Citations
16 Claims
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1. An electrochemical cell, comprising:
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a substantially round, cylindrical container comprising a conductive material, said container having;
a closed end with a negative terminal, an open end sealed by an end assembly that is electrically insulated from the container and has a positive terminal and a sidewall extending between the closed end and the open end;a nonaqueous, organic electrolyte; a jellyroll electrode assembly comprising a positive electrode, a separator and a negative electrode consisting essentially of lithium or a lithium alloy of at least 90 wt. % lithium and having a length, a width and a cumulative surface area; an internal lead connected to less than 0.7% of the cumulative surface area of the negative electrode at an edge of the negative electrode that is proximate to the closed end of the container; wherein the lead extends a distance across the negative electrode measured along a longitudinal axis of the electrode assembly from the edge of the negative electrode that is greater than 10% and less than 88% of the width of the negative electrode; wherein a portion of the lead is folded and extends upward to make electrical contact with the container sidewall by pressure only, said portion of the lead having an integrally formed groove to bias the lead against the sidewall; and wherein the maximum difference between the container inside diameter and the electrode assembly diameter is defined by one equation selected from the group consisting of; - View Dependent Claims (2, 3)
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4. An electrochemical cell, comprising:
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a substantially round, cylindrical container comprising a conductive material having a closed end with a negative terminal, an open end sealed by an end assembly electrically insulated from the container and having a positive terminal, and a sidewall extending between the closed end and the open end; a nonaqueous, organic electrolyte; a jellyroll electrode assembly comprising a positive electrode, a separator and a negative electrode consisting essentially of lithium or a lithium alloy of at least 90 wt. % lithium and having a length, a width and a cumulative surface area; and an internal lead oriented along a longitudinal axis of the jellyroll electrode assembly and folded so that a first terminal end of the lead is connected to the negative electrode and a second terminal end of the lead makes electrical contact with the container sidewall by pressure only; and wherein a portion of the lead has a groove to bias the lead against the sidewall; and wherein the maximum difference between the container inside diameter and the electrode assembly diameter is defined by one equation selected from the group consisting of; - View Dependent Claims (5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification