Method for diagnosing battery condition
First Claim
1. A method for diagnosing the relative general condition of a rechargeable electrochemical module undergoing discharge periods interposed with charge periods, wherein said discharge periods reduce net module charge and said charge periods increase net module charge, comprising the steps:
- subsequent to discharge periods;
providing module depth of discharge,providing module rate of discharge, andcalculating a scalar value as a predetermined function of said module depth of discharge and discharge rate wherein said scalar value provides a direct indication of the relative general condition of the module.
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Abstract
A method for diagnosing the general condition of a battery module in a string of such modules comprising a battery pack monitors voltage, current and temperatures of the modules and battery pack. Accumulators account for various charge quantities including charge out and net charge used for the battery pack as well as discharge period durations. State of charge is provided by appropriate means and used to update module capacities. The various charge and time accumulators are used to derive depth of discharge and discharge rate information providing inputs to predetermined functions for determining a simple scalar outputs directly indicative of the general condition of the modules.
57 Citations
8 Claims
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1. A method for diagnosing the relative general condition of a rechargeable electrochemical module undergoing discharge periods interposed with charge periods, wherein said discharge periods reduce net module charge and said charge periods increase net module charge, comprising the steps:
subsequent to discharge periods; providing module depth of discharge, providing module rate of discharge, and calculating a scalar value as a predetermined function of said module depth of discharge and discharge rate wherein said scalar value provides a direct indication of the relative general condition of the module. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for diagnosing the relative general condition of a rechargeable electrochemical module undergoing discharge periods interposed with charge periods, wherein said discharge periods reduce net module charge and said charge periods increase net module charge, comprising the steps:
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determining charge removed from one complete charge period characterized by full charge restoral to the module to the next complete charge period characterized by full charge restoral to the module; determining net charge removed from the module between complete charge periods characterized by full charge restoral to the module; updating a module state of charge during the discharge periods; calculating module capacity during the discharge periods as a predetermined function of said updated state of charge and said net charge removed from the module; and calculating a loss value as a predetermined function of said net charge removed from the module and said module capacity wherein said loss value represents incremental degradation of the relative general condition of the module. - View Dependent Claims (8)
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Specification