Method and device employing heat absorber for limiting battery temperature spikes
First Claim
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1. An implantable medical device, comprising:
- an implantable medical device housing that includes a housing wall of biocompatible material defining an interior volume;
a battery including an electrode assembly housed in a battery case and capable of producing a temperature greater than a temperature T1, the battery mounted within the interior volume; and
heat absorbing material exhibiting a phase change at the temperature T1 and positioned external to the electrode assembly for reducing the amplitude of a temperature excursion of the implantable medical device housing to prevent significant damage to body tissue.
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Abstract
A method and apparatus for containing heat generated by a battery to reduce the amplitude of a temperature excursion to enhance safety in temperature critical applications, such as in implantable medical devices. The apparatus employs a heat absorber (38) closely thermally coupled to the battery (30). The heat absorber includes heat-absorbing material preferably exhibiting an endothermic phase change at a temperature below that produced by the battery.
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Citations
37 Claims
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1. An implantable medical device, comprising:
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an implantable medical device housing that includes a housing wall of biocompatible material defining an interior volume; a battery including an electrode assembly housed in a battery case and capable of producing a temperature greater than a temperature T1, the battery mounted within the interior volume; and heat absorbing material exhibiting a phase change at the temperature T1 and positioned external to the electrode assembly for reducing the amplitude of a temperature excursion of the implantable medical device housing to prevent significant damage to body tissue. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A device, comprising:
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a housing that includes a wall defining an interior housing volume; a battery including an electrode assembly housed in a battery case and capable of producing a temperature greater than a temperature T1, the battery mounted within the interior volume with the battery case spaced from the housing; a heat absorber mounted adjacent to and thermally coupled to the battery case, the heat absorber including a heat absorbing material exhibiting a phase change at the temperature T1; and a fibrous mat contacting the heat absorbing material. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
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33. A method for containing heat generated by a battery having a battery case within a housing, comprising:
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spacing the battery case from the housing; providing high heat capacity material in thermal contact with the battery case and spaced from the housing; and transferring the heat generated from the battery to the high heat capacity material in the form of latent heat of fusion of the high heat capacity material. - View Dependent Claims (34, 35, 36, 37)
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Specification