Cell cap assembly with recessed terminal and enlarged insulating gasket
First Claim
Patent Images
1. A battery having an 18650 form-factor, the battery comprising:
- a cell case having a cylindrical outer surface, a first end and a second end, wherein said first end is closed by a cell case bottom, and wherein said second end is comprised of a central open portion;
an electrode assembly contained within said cell case, wherein a first electrode of said electrode assembly is electrically connected to said cell case; and
a cap assembly mounted to said cell case, said cap assembly closing said central open portion of said second end of said cell case, wherein said cap assembly further comprises;
a current interrupt device (CID), wherein said CID is electrically isolated from said cell case and electrically connected to a second electrode of said electrode assembly;
a safety vent element electrically isolated from said cell case, wherein an inner surface of said safety vent element is electrically connected to said CID, wherein a portion of an outer surface of said safety vent element serves as a battery terminal for said battery, and wherein said outer surface of said safety vent element is recessed relative to an outermost edge portion of said second end of said cell case; and
an insulating gasket interposed between an inner surface of said cell case and said safety vent element, wherein said insulating gasket includes an aperture, and wherein said aperture defines said battery terminal.
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Abstract
A simplified cell design is provided for a battery utilizing the 18650 form-factor, the simplified cell design reducing manufacturing cost, battery weight and the risk of shorting between the battery case and the battery terminal. In the cap assembly of the disclosed battery, the safety vent element, which is recessed relative to the top of the cell case, also serves as the battery terminal. Additionally, the insulating gasket positioned between the cell case and the cap assembly is designed to cover a large portion of the outer surface of the safety vent/battery terminal.
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Citations
17 Claims
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1. A battery having an 18650 form-factor, the battery comprising:
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a cell case having a cylindrical outer surface, a first end and a second end, wherein said first end is closed by a cell case bottom, and wherein said second end is comprised of a central open portion; an electrode assembly contained within said cell case, wherein a first electrode of said electrode assembly is electrically connected to said cell case; and a cap assembly mounted to said cell case, said cap assembly closing said central open portion of said second end of said cell case, wherein said cap assembly further comprises; a current interrupt device (CID), wherein said CID is electrically isolated from said cell case and electrically connected to a second electrode of said electrode assembly; a safety vent element electrically isolated from said cell case, wherein an inner surface of said safety vent element is electrically connected to said CID, wherein a portion of an outer surface of said safety vent element serves as a battery terminal for said battery, and wherein said outer surface of said safety vent element is recessed relative to an outermost edge portion of said second end of said cell case; and an insulating gasket interposed between an inner surface of said cell case and said safety vent element, wherein said insulating gasket includes an aperture, and wherein said aperture defines said battery terminal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A battery having an 18650 form-factor, the battery comprising:
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a cylindrical cell case with a first end and a second end, wherein said first end is closed by a cell case bottom, and wherein said second end is comprised of a central open portion; an electrode assembly contained within said cell case, wherein a first electrode of said electrode assembly is electrically connected to said cell case; and a cap assembly mounted within said cell case, said cap assembly closing said central open portion of said second end of said cell case, wherein said cap assembly does not include a positive temperature coefficient (PTC) current limiting element, and wherein said cap assembly further comprises; a current interrupt device (CID), wherein said CID is fabricated from aluminum and is electrically isolated from said cell case and electrically connected to a second electrode of said electrode assembly; a safety vent element fabricated from aluminum and electrically isolated from said cell case, wherein an inner surface of said safety vent element is electrically connected to said CID, wherein a portion of an outer surface of said safety vent element serves as a battery terminal for said battery, and wherein said outer surface of said safety vent element is recessed relative to an outermost edge portion of said second end of said cell case; and an insulating gasket interposed between an inner surface of said cell case and said safety vent element, wherein said insulating gasket covers at least 90 percent of said outer surface of said safety vent element, wherein said insulating gasket includes an aperture, and wherein said aperture defines said battery terminal. - View Dependent Claims (15, 16, 17)
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Specification