System and method for detecting battery end of discharge
First Claim
1. A method for controlling an energy storage device, the method comprising:
- determining an end-of-discharge voltage threshold for the energy storage device;
subsequently filtering the end-of-discharge voltage threshold via a filter;
adjusting a time constant of the filter based on at least one voltage-current condition;
comparing the filtered end-of-discharge voltage threshold and a terminal voltage of the energy storage device;
based on the comparison, determining a change of state of the energy storage device; and
,controlling the energy storage device based on the change of state.
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Abstract
The present disclosure is directed to a system and method for controlling an energy storage device by more accurately detecting an end-of-discharge voltage of the energy storage device. More specifically, in one embodiment, the method includes determining an end-of-discharge voltage threshold for the energy storage device. Another step includes filtering the end-of-discharge voltage threshold via a filter. The method also includes adjusting a time constant of the filter based on at least one voltage-current condition. Still a further step includes comparing the filtered end-of-discharge voltage threshold and a terminal voltage of the energy storage device. Based on the comparison, the method includes determining a change of state of the energy storage device. Thus, the energy storage device can be controlled based on the change of state.
17 Citations
20 Claims
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1. A method for controlling an energy storage device, the method comprising:
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determining an end-of-discharge voltage threshold for the energy storage device; subsequently filtering the end-of-discharge voltage threshold via a filter; adjusting a time constant of the filter based on at least one voltage-current condition; comparing the filtered end-of-discharge voltage threshold and a terminal voltage of the energy storage device; based on the comparison, determining a change of state of the energy storage device; and
,controlling the energy storage device based on the change of state. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for controlling an energy storage device, the method comprising:
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determining an end-of-discharge voltage threshold for the energy storage device based on, at least in part, a temperature and a current of the energy storage device; multiplying the current by a voltage weight, the voltage weight being a function of a distance to the end-of-discharge voltage threshold; determining an end-of-discharge voltage by integrating a weighted current; comparing the integrated weighted current with a predetermined threshold; and
,controlling the energy storage device based on the comparison.
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14. A system for controlling an energy storage device, the energy storage device comprising:
a controller comprising, at least, a filter, an integrator, and a comparator, the controller configured to perform one or more operations, the one or more operations comprising; determining an end-of-discharge voltage threshold for the energy storage device; subsequently filtering, via the filter, the end-of-discharge voltage threshold; adjusting a time constant of the filter based on at least one voltage-current condition; comparing, via the comparator, the filtered end-of-discharge voltage threshold and a terminal voltage of the energy storage device; determining a change of state of the energy storage device based on the comparison; and controlling the energy storage device based on the change of state. - View Dependent Claims (15, 16, 17, 18, 19, 20)
Specification