Method and article of manufacture for monitoring state of health of an electrical energy storage device
First Claim
Patent Images
1. Method for monitoring an electrical energy storage device, comprising:
- stabilizing the electrical energy storage device;
cyclically applying an electrical load to the electrical energy storage device;
monitoring state variables of the electrical energy storage device;
determining a resistance of the electrical energy storage device; and
,determining a remaining useful life parameter of the electrical energy storage device based upon the determined resistance.
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Abstract
There is provided a method and article of manufacture for monitoring an electrical energy storage device for a system. The method comprises stabilizing the electrical energy storage device. Once the device is stabilized, a discrete electrical load is cyclically applied to the electrical energy storage device and state variables of the electrical energy storage device are monitored. A resistance of the electrical energy storage device is determined, and a remaining useful life parameter of the electrical energy storage device is determined based upon the determined resistance.
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Citations
20 Claims
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1. Method for monitoring an electrical energy storage device, comprising:
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stabilizing the electrical energy storage device; cyclically applying an electrical load to the electrical energy storage device; monitoring state variables of the electrical energy storage device; determining a resistance of the electrical energy storage device; and
,determining a remaining useful life parameter of the electrical energy storage device based upon the determined resistance. - View Dependent Claims (2, 3, 9)
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4. Method for monitoring an electrical energy storage device, comprising:
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stabilizing the electrical energy storage device; cyclically activating and deactivating a discrete electrical load including executing a plurality of successive cyclical electrical load events each cyclical load event comprising a plurality of cycles of the discrete electrical load applied at a fixed frequency, wherein each successive cyclical electrical load event is executed at an increased frequency; monitoring state variables of the electrical energy storage device; determining a resistance of the electrical energy storage device; and determining a remaining useful life parameter of the electrical energy storage device based upon the determined resistance.
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5. Method for monitoring an electrical energy storage device, comprising:
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stabilizing the electrical energy storage device; cyclically applying an electrical load to the electrical energy storage device; monitoring state variables of the electrical energy storage device; determining a resistance of the electrical energy storage device comprising estimating the resistance by recursively executing a parametric equation comprising a mathematical model of an electrical circuit representative of the electrical energy storage device based upon the monitored state variables of the electrical energy storage device; and determining a remaining useful life parameter of the electrical energy storage device based upon the determined resistance.
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6. Method for monitoring an electrical energy storage device, comprising:
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stabilizing the electrical energy storage device; cyclically applying an electrical load to the electrical energy storage device; monitoring state variables of the electrical energy storage device; determining a resistance of the electrical energy storage device; and determining a remaining useful life parameter of the electrical energy storage device based upon the determined resistance comprising comparing the determined resistance and resistances of a new device and a low limit device. - View Dependent Claims (7)
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8. Method for monitoring an electrical energy storage device, comprising:
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stabilizing the electrical energy storage device comprising executing the method only after a delay of an elapsed period of time sufficient for the electrical energy storage device to achieve ambient temperature; cyclically applying an electrical load to the electrical energy storage device; monitoring state variables of the electrical energy storage device; determining a resistance of the electrical energy storage device; and determining a remaining useful life parameter of the electrical energy storage device based upon the determined resistance.
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10. Method for monitoring a state of health of an electrical energy storage device for a system, comprising:
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stabilizing the electrical energy storage device; cyclically applying a discrete electrical load to the electrical energy storage device; monitoring state variables of the electrical energy storage device; determining a resistance of the electrical energy storage device; and
,comparing the determined resistance and resistances of a new device and a low limit device based upon temperature. - View Dependent Claims (11, 12)
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13. Method for monitoring a state of health of an electrical energy storage device for a system, comprising:
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stabilizing the electrical energy storage device; cyclically applying a discrete electrical load to the electrical energy storage device; monitoring state variables of the electrical energy storage device; determining a resistance of the electrical energy storage device comprising recursively solving a parametric equation representative of the electrical energy storage device based upon the monitored state variables of the electrical energy storage device; and comparing the determined resistance and resistances of a new device and a low limit device based upon temperature. - View Dependent Claims (14)
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15. Method for monitoring a state of health of an electrical energy storage device for a system, comprising:
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stabilizing the electrical energy storage device; cyclically applying a discrete electrical load to the electrical energy storage device; monitoring state variables of the electrical energy storage device; determining a resistance of the electrical energy storage device; and comparing the determined resistance and resistances of a new device and a low limit device based upon temperature, including linearly comparing the determined resistance and resistances of the new device and the low limit device.
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16. Method for monitoring a state of health of an electrical energy storage device for a system, comprising:
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stabilizing the electrical energy storage device; cyclically applying a discrete electrical load to the electrical energy storage device; monitoring state variables of the electrical energy storage device; determining a resistance of the electrical energy storage device; and comparing the determined resistance and resistances of a new device and a low limit device based upon temperature including exponentially comparing the determined resistance and resistances of the new device and the low limit device.
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17. Method for monitoring a state of health of an electrical energy storage device for a system, comprising:
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stabilizing the electrical energy storage device including deactivating the system for a period effective to stabilize temperature of the electrical energy storage device; cyclically applying a discrete electrical load to the electrical energy storage device; monitoring state variables of the electrical energy storage device; determining a resistance of the electrical energy storage device; and comparing the determined resistance and resistances of a new device and a low limit device based upon temperature.
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18. Article of manufacture, comprising a storage medium having machine-executable code encoded therein effective to monitor a state of health of an electrical energy storage device for a system, the code comprising:
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code to stabilize the electrical energy storage device; code to cyclically apply a discrete electrical load to the electrical energy storage device; code to monitor state variables of the electrical energy storage device; code to determine a resistance of the electrical energy storage device; and
,code to determine a remaining useful life parameter of the electrical energy storage device based upon the determined resistance. - View Dependent Claims (19, 20)
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Specification