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, wherein the SOH of the battery is determined by calculating a state-of-charge (SOC) of the battery, after the predetermined period of time, using the following formula;
SOC=A×
OCV2+B×
OCV−
C, wherein the SOC represents the SOH of the battery, A and B represent the slope of the response, and C represents the OCV expected at 0% SOC.
13 Assignments
0 Petitions
Accused Products
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.
-
Citations
19 Claims
-
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, wherein the SOH of the battery is determined by calculating a state-of-charge (SOC) of the battery, after the predetermined period of time, using the following formula; SOC=A×
OCV2+B×
OCV−
C, wherein the SOC represents the SOH of the battery, A and B represent the slope of the response, and C represents the OCV expected at 0% SOC. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
-
-
11. A chemical battery management system comprising:
-
a battery and a controller configured to charge the battery, that estimates a state-of-health (SOH) of the battery, wherein the controller is 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, wherein the controller is configured to determine the SOH of the battery by calculating the state-of-charge (SOC) of the battery, after the predetermined period of time, using the following formula; SOC=A×
OCV2+B×
OCV−
C, wherein the SOC represents the SOH of the battery, A and B represents the slope of the response, and C represents the OCV expected at 0% SOC. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
-
Specification