Method and apparatus for real-time life estimation of an electric energy storage device
First Claim
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1. Method to determine state-of-life of an electrical energy storage device, comprising:
- monitoring electrical current through the electrical energy storage device;
monitoring a state-of-charge of the electrical energy storage device;
monitoring temperature of the electrical energy storage device during active periods of operation characterized by electrical current flow through the electrical energy storage;
monitoring temperature of the electrical energy storage device during quiescent periods of operation characterized by de minimis electrical current through the electrical energy storage device;
determining a state-of-life of the electrical energy storage device based upon the electrical current, the state-of-charge, and the temperature of the electrical energy storage device during the active periods of operation and during the quiescent periods of operation;
detecting an internal resistance change over time that is greater than a minimum amount; and
fixing the state-of-life to a predetermined value when the internal resistance is greater than the minimum amount.
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Abstract
Sate-of-life for an electrical energy storage device is predictively determined based on electrical current, state-of-charge, and temperature of the electrical energy storage device during active and quiescent periods of operation.
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Citations
17 Claims
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1. Method to determine state-of-life of an electrical energy storage device, comprising:
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monitoring electrical current through the electrical energy storage device; monitoring a state-of-charge of the electrical energy storage device; monitoring temperature of the electrical energy storage device during active periods of operation characterized by electrical current flow through the electrical energy storage; monitoring temperature of the electrical energy storage device during quiescent periods of operation characterized by de minimis electrical current through the electrical energy storage device; determining a state-of-life of the electrical energy storage device based upon the electrical current, the state-of-charge, and the temperature of the electrical energy storage device during the active periods of operation and during the quiescent periods of operation; detecting an internal resistance change over time that is greater than a minimum amount; and fixing the state-of-life to a predetermined value when the internal resistance is greater than the minimum amount. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. Apparatus for determining state-of-life of an electrical energy storage device, comprising:
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a temperature sensor adapted for sensing temperature of the energy storage device; and a computer based controller adapted to receive a signal indicative of sensed energy storage device temperature; said computer based controller including a storage medium having a computer program encoded therein, said computer program comprising; code for monitoring electrical current through the electrical energy storage device; code for monitoring a state-of-charge of the electrical energy storage device; code for monitoring temperature of the electrical energy storage device during active periods of operation characterized by electrical current flow through the electrical energy storage; code for monitoring temperature of the electrical energy storage device during quiescent periods of operation characterized by de minimis electrical current through the electrical energy storage device; code for monitoring a state-of-life of the electrical energy storage device based upon the electrical current, the state-of-charge, and the temperature of the electrical energy storage device during the active periods of operation and during the quiescent periods of operation; code to determine state-of-life of the electrical energy storage device, based upon the electrical current, the state-of-charge of the electrical energy storage device, and the temperature of the electrical energy storage device during active periods of operation and during quiescent periods of operation; code for detecting an internal resistance change over time that is greater than a minimum amount; and code for fixing the state-of-life to a predetermined value when the internal resistance is greater than the minimum amount. - View Dependent Claims (13, 14, 15, 16, 17)
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Specification