SYSTEMS AND METHODS FOR DETERMINING BATTERY STATE-OF-HEALTH
First Claim
1. A method of calculating a state-of-health (SOH) of a chemical battery including individual or parallel-grouped cells, the method comprising:
- charging the battery to a maximum charge potential of the battery;
after waiting a predetermined period of time after completion of the charging, determining an open-circuit voltage (OCV) of the battery; and
based on the determined OCV of the battery, determining the SOH of the battery.
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Abstract
A system and method use an open-circuit voltage (OCV) method of calculating a state-of-health (SOH) of a chemical battery. The OCV system and method includes charging the battery to a maximum charge potential, determining an open-circuit voltage (OCV) of the battery after waiting a predetermined period of time after completion of the charging, and determining the SOH of the battery based on the determined OCV of the battery. Another system and method use a time-to-charge (TTC) method of calculating a state-of-health (SOH) of a chemical battery. The TTC system and method includes monitoring and storing a charge time of the battery in a memory and scaling the stored charge time to form an SOH indication.
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Citations
22 Claims
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1. A method of calculating a state-of-health (SOH) of a chemical battery including individual or parallel-grouped cells, the method comprising:
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charging the battery to a maximum charge potential of the battery; after waiting a predetermined period of time after completion of the charging, determining an open-circuit voltage (OCV) of the battery; and based on the determined OCV of the battery, determining the SOH of the battery. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A chemical battery management system that estimates a state-of-health (SOH) of a battery, the system comprising:
a controller configured to (i) wait a predetermined period of time after the battery has been fully charged, (ii) after the predetermined period of time, determine an open-circuit voltage (OCV) of the battery, and (iii) determine the SOH of the battery from the determined OCV. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A method of calculating a state-of-health (SOH) of a chemical battery, the method comprising:
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monitoring and storing a charge time of the battery in a memory, the charge time being a time required for the battery to become fully charged from a predetermined depth-of-discharge using a fixed power input; and scaling the stored charge time to form a SOH indication, wherein the charge time decreases over a life of the battery.
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Specification