Implantable battery having thermal shutdown separator
First Claim
1. An electrode assembly comprising:
- a first electrode;
a second electrode;
an electrolyte; and
a separator located between the first and second electrodes to prevent contact therebetween;
the separator comprising;
a first separator sheet disposed between the first electrode and the second electrode, the first separator sheet comprising two permeable outer layers each adhered to a microporous inner layer; and
a second separator sheet disposed between the first and second electrodes, the second sheet consisting essentially of a single permeable layer,wherein the first separator sheet is separated from the second separator sheet by the electrolyte, andwherein the first separator sheet microporous inner layer has a first configuration porous to ion flow and a second configuration less porous to ion flow than the first configuration, and a first transition temperature between about 80 and 150 degrees C. at which the microporous inner layer transforms from the first configuration to the second configuration, and in which the permeable outer layers maintain their structural integrity to a temperature of about 10 degrees C. higher than the first transition temperature.
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Accused Products
Abstract
The present teachings include an electrochemical cell including an anode, a cathode, an electrolyte, a separator disposed between the cathode and anode, and a housing containing the anode, cathode, electrolyte, and separator. The separator can include a first sheet consisting essentially of a single layer material and a second sheet distinct from the first sheet. The second sheet can include an inner microporous layer laminated between two more outer layers. In some cells, the inner layer can have a transition temperature between a porous configuration and a substantially non-porous configuration that is between about 80 degrees C. and 150 degrees C., and in which the two more outer layers maintain their structural integrity to at least about 10 degrees C. greater than the first layer transition temperature.
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Citations
20 Claims
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1. An electrode assembly comprising:
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a first electrode; a second electrode; an electrolyte; and a separator located between the first and second electrodes to prevent contact therebetween; the separator comprising; a first separator sheet disposed between the first electrode and the second electrode, the first separator sheet comprising two permeable outer layers each adhered to a microporous inner layer; and a second separator sheet disposed between the first and second electrodes, the second sheet consisting essentially of a single permeable layer, wherein the first separator sheet is separated from the second separator sheet by the electrolyte, and wherein the first separator sheet microporous inner layer has a first configuration porous to ion flow and a second configuration less porous to ion flow than the first configuration, and a first transition temperature between about 80 and 150 degrees C. at which the microporous inner layer transforms from the first configuration to the second configuration, and in which the permeable outer layers maintain their structural integrity to a temperature of about 10 degrees C. higher than the first transition temperature. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An electrochemical cell comprising:
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an anode including an active anode material in contact with an anode current collector; a cathode including an active cathode material in contact with a cathode current collector; a separator disposed between the anode and the cathode; an electrolyte; and a housing containing the anode, cathode, separator, and electrolyte, the separator comprising a first sheet consisting essentially of a single layer material and a second sheet distinct from the first sheet, wherein the second sheet consists essentially of an inner microporous layer laminated between two outer layers, and wherein the first sheet is separated from the second sheet by the electrolyte. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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14. A battery comprising:
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a plurality of anode layers; a plurality of separator layers; a plurality of cathode layers; an electrolyte; wherein the cathode and anode layers are configured as a stack having one of the plurality of separator layers disposed therebetween, wherein the one of the plurality of separator layers includes a first sheet and a second sheet, the first sheet consisting essentially of a unitary polymeric material having an electrical resistivity of less than about 500 ohms per square centimeter, wherein the first sheet is separated from the second sheet by the electrolyte. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification