Method of estimating residual capacity of battery
First Claim
1. A method of estimating the residual capacity in a battery under use, comprising the steps of:
- a) measuring a singe first point of current/voltage characteristic of said battery;
b) retrieving a stored value of a second current/voltage characteristic point, said stored value obtained from a calibrating procedure, said procedure having obtained said second point as the intersection between current/voltage plots corresponding to various different residual capacities;
c) extracting the maximum transfer power value from said both first and second current/voltage characteristic points and estimating said residual capacity of said battery from said maximum transfer power value.
0 Assignments
0 Petitions
Accused Products
Abstract
In estimating the residual capacity of a battery according to the maximum output estimating process, a reference point is established in advance at the intersection of a plurality of current/voltage characteristic linear curves corresponding to various residual capacities of the battery or in an area in the vicinity of the intersections of the curves. A current/voltage characteristic linear curve is determined so as to pass through the reference point and a measured operating point of the battery which corresponds to the present discharging current and output voltage values measured when the battery is discharged. Then, a maximum transfer power value of the battery is determined from the current/voltage characteristic linear curve thus determined, and the present residual capacity of the battery is estimated from the maximum transfer power value.
20 Citations
19 Claims
-
1. A method of estimating the residual capacity in a battery under use, comprising the steps of:
-
a) measuring a singe first point of current/voltage characteristic of said battery; b) retrieving a stored value of a second current/voltage characteristic point, said stored value obtained from a calibrating procedure, said procedure having obtained said second point as the intersection between current/voltage plots corresponding to various different residual capacities; c) extracting the maximum transfer power value from said both first and second current/voltage characteristic points and estimating said residual capacity of said battery from said maximum transfer power value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
-
-
14. A method of calibrating batteries of a given type for later extracting residual capacity values in batteries of the same given type comprising the steps of:
-
a) obtaining several current/voltage plots, each plot obtained at a different value of residual capacity; b) obtaining, from said plots, a common intersection point and storing its value as a reference point, said reference point adapted to be used later in extracting maximum transfer power values for batteries of said given type. - View Dependent Claims (15, 16, 17, 18, 19)
-
Specification