| US 7,554,330 B2 | ||
| Method for determining the deterioration of a battery | ||
| Cyrus Ashtiani, West Bloomfield, Mich. (US); Rick Lagerstrom, Ferndale, Mich. (US); Otmar Bitsche, Stuttgart (Germany); and Bernd Spier, Burgrieden (Germany) | ||
| Assigned to Daimler AG, Stuttgart (Germany) | ||
| Filed on Feb. 23, 2004, as Appl. No. 10/785,565. | ||
| Claims priority of provisional application 60/449811, filed on Feb. 24, 2003. | ||
| Prior Publication US 2005/0001625 A1, Jan. 06, 2005 | ||
| Int. Cl. G01N 27/416 (2006.01); H02J 7/00 (2006.01) | ||
| U.S. Cl. 324—426 [320/132; 320/134] | 18 Claims |
| 1. A method for determining a deterioration of a battery, comprising:
measuring respective numbers of charge and discharge cycles at a plurality of depths of discharge of the battery;
determining a respective characteristic deterioration value for at least some of the charge and discharge cycles at each of
the plurality of depths of discharge using a deterioration curve characteristic of a type of the battery; and
summing the determined characteristic deterioration values so as to obtain the deterioration of the battery;
wherein each respective charge and discharge cycle is a respective partial cycle, the measuring being performed so as to measure
the respective partial cycle separately;
wherein the deterioration curve is a continuous function defining a dependence of each characteristic deterioration value
on the depth of the respective charge or discharge for the battery type.
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