Spiral wound electrochemical cell having high capacity
First Claim
1. In an improved electrochemical cell having a sealed casing, at least one external electrical terminal at an end of the casing, at least one spirally wound electrode plate in said casing electrically connected to said terminal and having a plurality of exposed plate edge portions, the improvement comprising:
- said electrically conductive terminal having an inner surface engaging said exposed edge portions of the electrode plate so as to be in electrical contact therewith, thereby to provide a plurality of electrode edge contact areas on said terminal inner surface for the transfer of current from the electrode plate to the terminal, said terminal further having a projecting portion at the exterior of said casing, and wherein said cell includes a heat sink encircling said terminal thermally coupled between said terminal and said electrode plate.
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Accused Products
Abstract
A high current capacity electrochemical cell of the spiral wound type is provided. The cell includes an hermetically sealed casing and a terminal connection which engages exposed edges of an internally positioned spirally wound electrode plate for the transfer of current from the plate to a plurality of regions on the terminal. A thermally conductive ring is provided at the terminal connection to dissipate heat generated at the regions of current transfer.
46 Citations
17 Claims
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1. In an improved electrochemical cell having a sealed casing, at least one external electrical terminal at an end of the casing, at least one spirally wound electrode plate in said casing electrically connected to said terminal and having a plurality of exposed plate edge portions, the improvement comprising:
said electrically conductive terminal having an inner surface engaging said exposed edge portions of the electrode plate so as to be in electrical contact therewith, thereby to provide a plurality of electrode edge contact areas on said terminal inner surface for the transfer of current from the electrode plate to the terminal, said terminal further having a projecting portion at the exterior of said casing, and wherein said cell includes a heat sink encircling said terminal thermally coupled between said terminal and said electrode plate. - View Dependent Claims (2, 3, 7, 9, 11, 12, 13, 14, 15)
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4. In an improved electrochemical cell having a sealed casing, at least one external electrical terminal at an end of the casing, at least one spirally wound electrode plate in said casing electrically connected to said terminal and having a plurality of exposed plate edge portions, the improvement comprising:
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said electrically conductive terminal having an inner surface engaging said exposed edge portions of the electrode plate so as to be in electrical contact therewith, thereby to provide a plurality of electrode edge contact areas on said terminal inner surface for the transfer of current from the electrode plate to the terminal, said terminal further having a projecting portion forming electrical terminal at the exterior of said casing, said cell further comprising a plurality of current transfer conductive tabs which electrically connect said exposed edge portions of said electrode plate with said terminal, said current transfer conductive tabs engaging a plurality of regions on said inner surface of said terminal; and
whereinsaid current transfer conductive tabs have raised portions and body portions, said body portions engaging said exposed edge portions of said electrode plate, and wherein said inner surface of said terminal is provided with peripheral recess and said raised portions of said current transfer conductive tabs contact said terminal along said peripheral recess. - View Dependent Claims (6, 10)
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5. In an improved electrochemical cell having a sealed casing, at least one external electrical terminal at an end of the casing, at least one spirally wound electrode plate in said casing electrically connected to said terminal and having a plurality of exposed plate edge portions, the improvement comprising:
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said electrically conductive terminal having an inner surface engaging said exposed edge portions of the electrode plate so as to be in electrical contact therewith, thereby to provide a plurality of electrode edge contact areas on said terminal inner surface for the transfer of current from the electrode plate to the terminal, said terminal further having a projecting portion forming electrical terminal at the exterior of said casing, said cell further comprising a plurality of current transfer conductive tabs which electrically connect said exposed edge portions of said electrode plate with said terminal, said current transfer conductive tabs engaging a plurality of regions on said inner surface of said terminal; and
whereinsaid current transfer conductive tabs have raised portions and body portions, said body portions engaging said exposed edge portions of said electrode plate, and wherein a thermally conductive member is positioned in heat sinking relation to said current transfer conductive tabs.
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8. In an improved electrochemical cell having a sealed casing, at least one external electrical terminal at an end of the casing, at least one spirally wound electrode plate in said casing electrically connected to said terminal and having a plurality of exposed plate edge portions, the improvement comprising:
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said electrically conductive terminal having an inner surface engaging said exposed edge portions of the electrode plate so as to be in electrical contact therewith, thereby to provide a plurality of electrode edge contact areas on said terminal inner surface for the transfer of current from the electrode plate to the terminal, said terminal further having a projecting portion forming said electrical terminal at the exterior of said casing; and
whereinsaid terminal is hermetically sealed to said casing by means of an interference fit, said interference fit employing a sealing ring being constructed of a material capable of up to about 25% compression in the lateral direction.
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16. An electrochemical cell comprising:
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a sealed casing having an electrical terminal projecting through an end thereof; a spirally wound electrode plate enclosed within said casing; an electrically conducting strap engaging edge portions of said electrode plate and having tabs for connection with said terminal; and said terminal being provided with a peripheral recess along an inner surface thereof for mating with tabs of said strap.
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17. An electrochemical cell comprising:
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a sealed casing having an electrical terminal projecting through an end thereof; a spirally wound electrode plate enclosed within said casing; a strap connecting edge portions of said electrode plate with said terminal; a heat sink encircling said terminal and in thermal contact therewith; and
whereinsaid strap includes tab means for engaging in thermal contact with said heat sink.
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Specification