Devices and methods for protection of rechargeable elements
1 Assignment
0 Petitions
Accused Products
Abstract
A protection circuit for use with a charger and a chargeable element, such as a rechargeable lithium ion battery, comprises a shunt regulator having a threshold ON voltage coupled in parallel across the chargeable element, and a temperature-dependent resistor, e.g., a positive temperature coefficient device, coupled in series between the charger and the chargeable element. The temperature dependent resistor is thermally and electrically coupled to the shunt regulator, wherein the first variable resistor limits current flowing through the shunt regulator if the current reaches a predetermined level less than that which would cause failure of the regulator, due to ohmic heating of the regulator.
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Citations
57 Claims
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1-44. -44. (canceled)
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45. A method for manufacturing a circuit protection device, comprising:
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forming a substrate comprising a positive temperature coefficient material;
applying an electrically conductive layer to a first surface of the substrate; and
attaching a thermally and electrically conductive element of a voltage regulation device to the conductive layer. - View Dependent Claims (46, 47)
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48. A method of manufacturing circuit protection devices, comprising:
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forming a substrate comprising a positive temperature coefficient material;
applying an electrically conductive layer to a surface of the substrate;
applying an electrically insulating layer on the conductive layer;
removing selected portions of the insulating layer, thereby forming windows in the insulating layer, the windows defining exposed portions of the conductive layer;
attaching voltage regulation devices to the exposed conductive layer portions; and
cutting the substrate into a plurality of pieces. - View Dependent Claims (49, 50, 51, 52, 53, 54, 55, 56, 57)
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Specification