Method for determining capacity of lead-acid batteries of various specific gravities
First Claim
1. A method of determining a capacity of a lead-acid battery comprising:
- applying a predetermined current ramp to a fully charged lead-acid battery while measuring a battery terminal voltage;
determining an Iup, wherein the Iup is a transition current from charging to overcharging;
determining a specific gravity of the lead-acid battery;
determining the capacity of the lead-acid battery from the Iup using a correlation function that describes the relationship of the Iup to the capacity, wherein the correlation function depends on the specific gravity of the lead-acid battery.
1 Assignment
0 Petitions
Accused Products
Abstract
In accordance with various embodiments, there is a method for determining the capacity of a battery. Various embodiments include applying a predetermined current ramp to a fully charged lead-acid battery while measuring a battery terminal voltage. An Iup can be determined, where the Iup is a transition from charging to overcharging. A specific gravity of the lead-acid battery can also be determined. The capacity of the lead-acid battery can then be determined from the Iup using a correlation function that describes the relationship of the Iup to the capacity, where the correlation function depends on the specific gravity of the lead-acid battery.
-
Citations
19 Claims
-
1. A method of determining a capacity of a lead-acid battery comprising:
-
applying a predetermined current ramp to a fully charged lead-acid battery while measuring a battery terminal voltage;
determining an Iup, wherein the Iup is a transition current from charging to overcharging;
determining a specific gravity of the lead-acid battery;
determining the capacity of the lead-acid battery from the Iup using a correlation function that describes the relationship of the Iup to the capacity, wherein the correlation function depends on the specific gravity of the lead-acid battery. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
-
-
9. An apparatus for determining a capacity of a lead-acid battery comprising:
-
a power supply;
a control module comprising an analog-to-digital converter, a digital-to-analog converter, and an electronics control system, wherein the control module controls the power supply to apply a current to a lead-acid battery;
a control relay electrically connected to the power supply;
a sensor that detects a battery voltage response to a current ramp, the sensor electrically connected to the control relay; and
a processor configured to determine Iup, where Iup is a current at a gassing point;
the processor further configured to determine a capacity of the lead-acid battery based on the Iup and a specific gravity of the lead-acid battery. - View Dependent Claims (10, 11, 12, 13)
-
-
14. A computer readable medium for determining a capacity of a battery, the computer readable medium comprising:
-
program code for applying a current ramp to a fully charged battery;
program code for measuring an battery terminal voltage response to the current ramp;
program code for determining an Iup, wherein the Iup is a transition from charging to overcharging;
program code for determining a specific gravity of the lead-acid battery;
program code for determining the capacity of the lead-acid battery from the Iup using a correlation function, wherein the correlation function depends on the specific gravity of the lead-acid battery. - View Dependent Claims (15, 16, 17, 18, 19)
-
Specification