Battery state of health monitoring system and method
First Claim
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1. A state-of-health monitoring and prognosis method for a battery comprising:
- monitoring battery terminal voltage and current;
extracting a portion of said battery terminal voltage and current corresponding to an engine cranking event;
determining an intercept voltage (V0) based on the extracted portion of said battery terminal voltage and current signals corresponding to an engine cranking event, wherein the intercept voltage is the battery voltage when the battery current is equal to zero;
obtaining a battery open-circuit-voltage (Vocv) before the engine cranking event;
estimating a battery voltage loss (Vloss) that occurs during said engine cranking event based on subtracting the battery open-circuit-voltage (Vocv) from the intercept voltage (V0) andcomparing the estimated battery voltage loss (Vloss) with a predetermined voltage loss threshold ( Vloss) to determine battery state-of-health.
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Abstract
A state-of-health monitoring and prognosis method and system for a battery includes a signal preprocessing module for monitoring battery terminal voltage and current and extracting a portion of the battery terminal voltage and current corresponding to an engine cranking event. Battery voltage loss that occurs during said engine cranking event is estimated from the extracted portion of battery terminal voltage and current by a voltage loss estimation module. The estimated battery voltage loss is compared with a predetermined voltage loss threshold to determine battery state-of-health by a state-of-health evaluation module.
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Citations
18 Claims
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1. A state-of-health monitoring and prognosis method for a battery comprising:
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monitoring battery terminal voltage and current; extracting a portion of said battery terminal voltage and current corresponding to an engine cranking event; determining an intercept voltage (V0) based on the extracted portion of said battery terminal voltage and current signals corresponding to an engine cranking event, wherein the intercept voltage is the battery voltage when the battery current is equal to zero; obtaining a battery open-circuit-voltage (Vocv) before the engine cranking event; estimating a battery voltage loss (Vloss) that occurs during said engine cranking event based on subtracting the battery open-circuit-voltage (Vocv) from the intercept voltage (V0) and comparing the estimated battery voltage loss (Vloss) with a predetermined voltage loss threshold ( V loss) to determine battery state-of-health. - View Dependent Claims (2, 3, 4, 5, 6, 8, 9, 10, 11, 12, 13, 14)
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7. The method of 6, wherein the predefined threshold is substantially −
- 100 Amps.
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15. A state-of-health monitoring and prognosis system for a vehicular battery used in an engine starting application, comprising:
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a signal preprocessing module for receiving a plurality of inputs from a plurality of sensors that sense a plurality of battery parameters, wherein the signal preprocessing module determines an intercept voltage signal based on extracting battery current and voltage signals corresponding to an engine cranking event and obtains a measure of battery open-circuit-voltage signal before the engine cranking event; a voltage loss estimation module providing a voltage loss signal corresponding to battery voltage loss that occurs during engine cranking events based on subtracting the measure of battery open-circuit-voltage from the intercept voltage signal; and a state-of-health evaluation module providing a battery state-of-health signal based on said voltage loss output signal. - View Dependent Claims (16, 17, 18)
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Specification