Method and apparatus for maintaining cell wall integrity during thermal runaway using multiple cell wall layers
First Claim
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1. A battery assembly, comprising:
- a battery, said battery comprising;
a pre-fabricated cell case having an exterior sidewall surface, a first end portion and a second end portion, wherein said first end portion is comprised of a cell case bottom, and wherein said second end portion is comprised of a cap assembly retention lip and a central open portion;
an electrode assembly contained within said pre-fabricated cell case, wherein a first electrode of said electrode assembly is electrically connected to said pre-fabricated cell case; and
a cap assembly mounted to said pre-fabricated cell case, said cap assembly closing said central open portion of said second end portion, wherein said cap assembly further comprises a battery terminal electrically isolated from said pre-fabricated cell case and electrically connected to a second electrode of said electrode assembly; and
at least one layer pair positioned around said exterior sidewall surface of said pre-fabricated cell case, wherein each layer pair of said at least one layer pair is comprised of an inner layer comprised of a thermally insulating material and an outer layer comprised of a high yield strength material, wherein said high yield strength material has a yield strength of at least 250 MPa, wherein an interior surface of an innermost layer of an innermost layer pair of said at least one layer pair is proximate to said exterior sidewall surface of said pre-fabricated cell case.
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Abstract
A method and apparatus is provided in which at least one layer pair comprised of an inner, thermally insulating layer and an outer, high yield strength layer, surrounds the casing of a battery, the at least one layer pair inhibiting the flow of hot, pressurized gas from within the battery through perforations formed in the battery casing during a thermal runaway event.
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Citations
28 Claims
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1. A battery assembly, comprising:
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a battery, said battery comprising; a pre-fabricated cell case having an exterior sidewall surface, a first end portion and a second end portion, wherein said first end portion is comprised of a cell case bottom, and wherein said second end portion is comprised of a cap assembly retention lip and a central open portion; an electrode assembly contained within said pre-fabricated cell case, wherein a first electrode of said electrode assembly is electrically connected to said pre-fabricated cell case; and a cap assembly mounted to said pre-fabricated cell case, said cap assembly closing said central open portion of said second end portion, wherein said cap assembly further comprises a battery terminal electrically isolated from said pre-fabricated cell case and electrically connected to a second electrode of said electrode assembly; and at least one layer pair positioned around said exterior sidewall surface of said pre-fabricated cell case, wherein each layer pair of said at least one layer pair is comprised of an inner layer comprised of a thermally insulating material and an outer layer comprised of a high yield strength material, wherein said high yield strength material has a yield strength of at least 250 MPa, wherein an interior surface of an innermost layer of an innermost layer pair of said at least one layer pair is proximate to said exterior sidewall surface of said pre-fabricated cell case. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A battery assembly comprising:
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a battery, said battery comprising; a cell case having an 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, wherein said cap assembly further comprises a battery terminal electrically isolated from said cell case and electrically connected to a second electrode of said electrode assembly; and at least one layer pair surrounding said outer surface of said cell case, wherein each layer pair of said at least one layer pair is comprised of an inner layer comprised of a thermally insulating material and an outer layer comprised of a high yield strength material, wherein said at least one layer pair surrounding said outer surface of said cell case redirects the flow of hot, pressurized gas from within said battery through a perforation formed in said outer surface of said cell case during a thermal runaway event towards said first end or said second end.
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- 19. A method of modifying a pre-fabricated battery case the method comprising the step of covering an exterior sidewall battery case surface of said pre-fabricated battery case in at least one layer pair, wherein each layer pair of said at least one layer pair is comprised of an inner layer comprised of a thermally insulating material and an outer layer comprised of a high yield strength material, wherein said high yield strength material has a yield strength of at least 250 MPa.
Specification