State of health recognition of secondary batteries
AssigneeGEM Power, LLC
InventorsBoris J. Tsenter, John E. James
Life of this patent
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Abstract
An invention is provided for determining a state of health of a battery. The invention includes applying a predefined load profile to a battery, and obtaining a plurality of battery response voltage data corresponding to points along the predefined load profile. A matrix of parameters, which includes, among other data, battery ohm resistance data, battery chemical resistance data, and battery electrical double layer capacity data, is calculated from the battery response voltage data. Thereafter, the matrix of parameters is utilized to determine the state of health of the battery.
Claims17
A method for determining a state of health of a battery, comprising the operations of:
- applying a predefined load profile to a battery;
- obtaining a plurality of battery response voltage data corresponding to points along the predefined load profile;
- calculating a matrix of parameters from the battery response voltage data, wherein the matrix of parameters includes battery ohm resistance data, battery chemical resistance data, and battery electrical double layer capacity data;
- determining from the matrix of parameters the state of health of the battery;
- and
- determining useful remaining life of the battery, wherein an end to the useful remaining life of the battery is predicted when a sharp rise occurs in the battery electrical double layer capacity when a battery state of charge is about 100%.
A method for determining a state of health of a battery, comprising the operations of:
- generating a state of charge profile for a battery, wherein the state of charge profile indicates matrix of parameter data values corresponding to at least two battery state of charge percentages;
- calculating a current matrix of parameters for the battery from current battery response voltage data, wherein the current matrix of parameters includes battery ohm resistance data, battery chemical resistance data, and battery electrical double layer capacity data;
- comparing the current matrix of parameters to the state of charge profile to determine the current battery state of charge;
- determining the state of health of the battery based on the current battery state of charge;
- and
- determining useful remaining life of the battery, wherein an end to the useful remaining life of the battery is predicted when a sharp rise occurs in the battery electrical double layer capacity when a battery state of charge is about 100%.
A system for determining a state of health of a battery, comprising:
- a switching circuit coupled to a power source and a battery load, the switching circuit capable of applying a predefined load profile to a battery;
- and
- a battery management module coupled to the switching circuit, the battery management module comprising:
- logic that obtains a plurality of battery response voltage data corresponding to points along the predefined load profile;
- logic that calculates a matrix of parameters from the battery response voltage data, wherein the matrix of parameters includes battery ohm resistance data, battery chemical resistance data, and battery electrical double layer capacity data;
- and
- logic that determines from the matrix of parameters the state of health of the battery;
- and
- logic that predicts an end to the useful remaining life of the battery when a sharp rise occurs in the battery electrical double layer capacity when the battery state of charge is about 100%.
Dependencies are inferred from the claim text.