Patent ID: 7209841

Claim:
A system for determining an operating limit of at least one battery, comprising: a voltage module that measures a voltage V across at least one battery during first and second periods; a current sensor that measures current I supplied by the at least one battery during said first and second periods; and a limit module that estimates a sum of a polarization voltage V P and an open circuit voltage V 0 of the at least one battery at said second period based on said voltage V and current I of the at least one battery at said first period and an ohmic resistance R 0 of the at least one battery and wherein said limit module calculates at least one of a maximum current limit I max and/or a minimum current I min limit for the at least one battery at said second period based on said sum, at least one of a maximum voltage limit V max and/or a minimum voltage limit V min , respectively, and said ohmic resistance R 0 of the at least one battery.