Explosion resistant battery cells
First Claim
1. In an explosion resistant sealed battery cell having an electrolyte and an anode-cathode structure, the improvement comprising:
- a casing formed in a non-cylindrical configuration to render it distortable in shape by internal pressure to increase its volume, said non-cylindrical casing being made of a flexible material and having such dimensions and configuration to enable such volume expanding distortion without the creation of any breaks in the casing which would vent the interior thereof to atmosphere; and
thermally responsive means associated with said cell for hermetically sealing the cell before and during volume expansion, said thermally responsive means being operable to melt at some pre-determined temperature associated with an internal pressure in excess of that causing volume expansion, melting of said thermally responsive means venting the casing to release excessive pressure from within said casing after the pressure induced volume expansion has taken place.
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Abstract
An explosion resistant battery cell incorporating safety features adapted to counter the effects of the build-up of high internal pressures. The external metallic casing for the cell has a non-cylindrical cross-section which may be square, rectangular or other geometric configuration other than cylindrical to allow bulging of the outer walls which may result from internal pressure build-up. A thermal venting mechanism is provided in the nature of a low melting point metal plug inserted in the end of an associated electrolyte fill tube, the metal plug providing a hermetic seal but having a melting point considerably below the temperature at which explosion of the battery cell might occur depending on the electrolyte being used.
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Citations
14 Claims
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1. In an explosion resistant sealed battery cell having an electrolyte and an anode-cathode structure, the improvement comprising:
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a casing formed in a non-cylindrical configuration to render it distortable in shape by internal pressure to increase its volume, said non-cylindrical casing being made of a flexible material and having such dimensions and configuration to enable such volume expanding distortion without the creation of any breaks in the casing which would vent the interior thereof to atmosphere; and thermally responsive means associated with said cell for hermetically sealing the cell before and during volume expansion, said thermally responsive means being operable to melt at some pre-determined temperature associated with an internal pressure in excess of that causing volume expansion, melting of said thermally responsive means venting the casing to release excessive pressure from within said casing after the pressure induced volume expansion has taken place. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A battery cell, comprising:
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a non-cylindrical casing constructed in a configuration and of a flexible material to expand its volume by bulging out its sides in response to otherwise explosive internal pressure levels within the casing, said casing material being sufficiently flexible to achieve such expansion without breaking open or otherwise venting the interior of the cell; an anode-cathode structure, including a permanently mounted electrolyte fill tube and an electrolyte contained within said casing; and a low melting point metalic plug fused to the inside of said fill tube for hermetically sealing said casing up to temperatures of a predetermined maximum, said plug being adapted to melt at said maximum temperature to unplug the fill tube and vent the interior of said casing to its surroundings for averting explosion of the cell after said casing has expanded its volume.
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Specification