Claims
- 1. A method for determining the state of charge of a lithium-ion battery using a look-up table of ramp-peak current versus state of charge for that lithium-ion battery, said method comprising the steps of:inputting into a computer the type of that lithium-ion battery, measuring a ramp-peak current for said battery, executing a ramp-peak current correlation algorithm based on inputs comprising (i) the type of said battery inputted into said computer and (ii) the measured ramp-peak current for said battery, and determining the state of charge of the lithium-ion battery based on said ramp-peak current correlation algorithm.
- 2. The method of claim 1 wherein said ramp-peak current correlation algorithm comprises a table-look up followed by linear interpolation.
- 3. The method in accordance with claim 1 wherein said inputs to said ramp-peak current correlation algorithm further include measured battery temperature.
- 4. The method in accordance with claim 1 further comprising measuring an open circuit voltage for said battery and said inputs to said correlation algorithm further including the measured open circuit voltage for said battery.
Parent Case Info
This application is a divisional of U.S. application Ser. No. 09/721,003 filed Nov. 22, 2000 now U.S. Pat. No. 6,586,130.
US Referenced Citations (5)
Foreign Referenced Citations (1)
Number |
Date |
Country |
2734061 |
Nov 1996 |
FR |