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US 7,598,712 B2Granted
Method and apparatus for real-time life estimation of an electric energy storage device
AssigneeGM Global Technology Operations LLC
InventorsAndrew M. Zettel, Anthony H. Heap
Life of this patent
Estimating the term…
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.
Claims17
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.
5 more elements
Apparatus for determining state-of-life of an electrical energy storage device, comprising:
- 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.
10 more elements
Dependencies are inferred from the claim text.