Battery connections and metallized film components in energy storage devices having internal fuses
A lithium battery cell with an internal fuse component and including needed tabs which allow for conductance from the internal portion thereof externally to power a subject device is provided. Disclosed herein are tabs that exhibit sufficient safety levels in combination with the internal fuse characteristics noted above while simultaneously displaying pull strength to remain in place during utilization as well as complete coverage with the thin film metallized current collectors for such an electrical conductivity result. Such tabs are further provided with effective welds for the necessary contacts and at levels that exhibit surprising levels of amperage and temperature resistance to achieve the basic internal fuse result with the aforementioned sufficient conductance to an external device. With such a tab lead component and welded structure, a further improvement within the lithium battery art is provided the industry.
1. An energy storage device comprising an anode, a cathode, at least one separator present between said anode and said cathode, at least one liquid electrolyte, at least one thin film current collector in contact with at least one of said anode and said cathode, and at least one tab attached to said at least one thin film current collector, wherein
a. said at least one tab is attached to said collector through a connection means;
b. said connection means exhibits electrical contact with an exposed surface of said at least one tab and said at least one thin film current collector;
c. either of said anode or said cathode are interposed between at least a portion of said thin at least one film current collector and said at least one separator;
d. said at least one film current collector comprises a conductive material coated on a non-conductive material substrate;
e. said at least one film current collector stops conducting at the point of contact of a short circuit at the operating voltage of said energy storage device; and
f. said operating voltage is at least 2.0 volts.
2. The energy storage device of claim 1 , wherein said connection means is selected from the group consisting of welds, tape, staples, interposing metal strips, z-folded metal strips, conductive adhesives and clamps.
3. The device of claim 2 , wherein the connection means consists of between 2 and 50 connections distributed throughout said at least one film current collector so as to allow uniform current flow from the electrode materials to the tabs.
4. The device of claim 1 , wherein said at least one film current collector is folded to allow face-to-face contact between the opposing sides of the said at least one film current collector.
5. The device of claim 1 , wherein said at least one separator is polymeric, nonwoven, fabric or ceramic.
6. The device of claim 1 , wherein said non-conductive material substrate is a polymer film.
7. The device of claim 1 , wherein said at least one liquid electrolyte is a flammable organic electrolyte.