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Battery diagnostic method utilizing a universal normalized discharge curve for predicting battery reserve time
| Details |
Inventors: Hirsch, Marc Daniel; Mathiesen, Gregory W.; Ng, Patrick Kwok-Yeung;
Assignee: Tyco Electronics Logistics AG (Mesquite, TX)
Primary Examiner: Hoff; Marc S.
Assistant Examiner: Tsai; Carol S. W.
Attorney, Agent or Firm: Locke Liddell & Sapp LLP
A method for monitoring and diagnosing the status of a battery in an electrical system, more particularly, a method for determining a battery's reserve time based on comparison of measurements made during a battery discharge to a universal normalized discharge curve. Specifically, a battery discharge is initiated and the battery's voltage and discharge time is continuously measured. The measured battery voltage is normalized by dividing it by either the peak voltage or foothill voltage, as monitored during the discharge. By comparing this normalized voltage measurement to a universal normalized discharge curve, the percent discharge level of the battery is determined. Using the percent discharge level and the discharge time, the reserve time and total capacity of the battery can be determined. |
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DETAILED DESCRIPTION To this end, in accordance with the present invention, there is provided a simplified method for monitoring the status of a battery and, more specifically, for predicting battery reserve time.
The method of the present invention monitors a battery's performance during discharge and compares the normalized battery voltage measured during the discharge to a universal normalized discharge curve.
By determining where the measured normalized battery voltage falls on the universal normalized discharge curve, the battery's remaining capacity or reserve time (t) can be calculated.
The method of the present invention is superior in that it is simpler and less costly to implement and yet still provides relatively accurate results.
In particular, the method does not require extensive testing of the battery to predetermine battery parameters or data.
The inventive method does not require sophisticated hardware or software capability in the system to perform the necessary calculations in real-time.
The method requires no monitoring of the battery status; i.
e.
, age, condition, rate of discharge, etc.
And finally, since the universal normalized discharge curve is the same for all similar types of batteries (i.
e.
, valve-regulated lead acid batteries, flooded lead acid batteries, etc.
) irrespective of changes in battery models, battery temperature, age of the battery, and discharge rates, the method requires no modification to use in different systems utilizing various types of batteries.
The inventive method of monitoring the status of a battery, comprises the steps of: predetermining the desired percent of battery discharge of the total available capacity for the battery; determining the normalized battery voltage level corresponding to the desired percent of battery discharge using a universal normalized discharge curve; initiating a battery discharge; monitoring the battery voltage and time throughout the discharge; identifying the peak voltage (V.
sub.
p) of the battery discharge; determining a measured normalized battery voltage by normalizing the battery voltage with the peak voltage (V
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