Optimal battery charging for damage mitigation
First Claim
1. A method for charging an electrical storage device so as to extend the life thereof, the method comprising the steps of:
- developing an essentialized cell model structure of the electrical storage device utilizing a hybrid cell model approach;
determining model parameters for charge-discharge data of the structure;
determining charge-discharge behavior of the structure in a voltage-charge plane;
measuring voltage values of the structure based upon the charge-discharge behavior; and
deriving an instantaneous damage rate from the measured voltage values, wherein the method achieves real time observation of the charge state of the electrical storage device.
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Abstract
A system and method for charging and thus extending the life of an electrical storage device is disclosed. The system provides for developing an essentialized cell model structure of the electrical storage device; determining model parameters for charge-discharge data of the structure; and determining charge-discharge behavior of the structure in a voltage-charge plane. The method also includes measuring voltage values of the structure based upon the charge-discharge behavior; and deriving an instantaneous damage rate from the measured voltage values. The method further includes developing a charging profile based upon the instantaneous damage rate, wherein the charging profile optimizes a charging current with respect to the damage per cycle so as to extend the overall life of the electrical storage device. The method also includes the ability of the system to track the parameters of the electrical storage device as the device changes with time.
19 Citations
12 Claims
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1. A method for charging an electrical storage device so as to extend the life thereof, the method comprising the steps of:
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developing an essentialized cell model structure of the electrical storage device utilizing a hybrid cell model approach; determining model parameters for charge-discharge data of the structure; determining charge-discharge behavior of the structure in a voltage-charge plane; measuring voltage values of the structure based upon the charge-discharge behavior; and deriving an instantaneous damage rate from the measured voltage values, wherein the method achieves real time observation of the charge state of the electrical storage device. - View Dependent Claims (2, 11)
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3. An optimal re-charging controller for an electrical storage device comprising:
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a simulation processor receiving an input signal sent to the electrical storage device and a measured output signal generated by the electrical storage device, wherein the simulation processor models a plurality of states of the electrical storage device and generates an estimated output signal so that the controller, utilizing a hybrid cell model approach, mitigates damage to the electrical storage device, and wherein the simulation processor comprises; a feedback component which receives the measured output signal and the estimated output signal to generate a correction signal; and an observer component which receives the correction signal and the input signal to generate the estimated output signal and an estimated internal state signal, wherein the estimated output signal converges a plurality of modeled dynamic states to corresponding states of the electrical storage device, and wherein the correction signal represents a real-time estimate of the amount of damage being done to the electrical storage device during re-charging, such that the controller achieves real time observation of the charge state of the electrical storage device. - View Dependent Claims (4, 5, 6, 7, 8, 9, 10, 12)
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Specification