Method and system for controlling energy storage device
First Claim
1. A method for controlling an energy storage system, the method comprising:
- (a) initiating a discharge operation in an energy storage system that is in operable communication with a controller;
(b) measuring potential and current;
(c) the controller performing an instantaneous calculation based on the measurements in step (b) to determine a discharge effectiveness indicator, wherein the discharge effective indicator is determined as a function of incremental energy;
(d) generating an energy curve from the step (c) calculations and determining at least one of an absolute value or a relative slope of the discharge effectiveness indicator;
(e) repeating steps (b)-(d) at a sampling frequency until a deviation in the at least one of the absolute value or the relative slope is detected; and
(f) upon detecting the deviation in the at least one of the absolute value or the relative slope, the controller either signaling that the energy storage system is near end-of-discharge, terminating the discharge operation of the energy storage system, or doing both.
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Accused Products
Abstract
A system and method of use including a controller responsive to a deviation in absolute value or relative slope and operable to terminate a discharge operation in an energy storage device is provided. The absolute value or relative slope is determined at sampling frequency based upon a combination of measured operating parameters, for example, potential and current. Any deviation in the absolute value or relative slope indicates that a threshold limit in the available energy of the system has been reached, for example when active materials in the device are at a point of depletion, indicating a need to cease the discharge operation. The system and method operate on a real-time basis, providing instantaneous SOH information with regard to the device.
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Citations
9 Claims
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1. A method for controlling an energy storage system, the method comprising:
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(a) initiating a discharge operation in an energy storage system that is in operable communication with a controller; (b) measuring potential and current; (c) the controller performing an instantaneous calculation based on the measurements in step (b) to determine a discharge effectiveness indicator, wherein the discharge effective indicator is determined as a function of incremental energy; (d) generating an energy curve from the step (c) calculations and determining at least one of an absolute value or a relative slope of the discharge effectiveness indicator; (e) repeating steps (b)-(d) at a sampling frequency until a deviation in the at least one of the absolute value or the relative slope is detected; and (f) upon detecting the deviation in the at least one of the absolute value or the relative slope, the controller either signaling that the energy storage system is near end-of-discharge, terminating the discharge operation of the energy storage system, or doing both. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification