Apparatus and method for simulating a battery tester with a fixed resistance load
First Claim
1. A battery testing method that is based on battery rating standards, the method comprising:
- (a) measuring a dynamic parameter of the battery;
(b) obtaining an open circuit voltage of the battery;
(c) obtaining a temperature of the battery;
(d) setting a predetermined load resistance value;
(e) estimating a full charge dynamic parameter and a full charge open circuit voltage of the battery;
(f) estimating a load voltage of the battery as a function of the estimated charged battery dynamic parameter, the charged open circuit voltage of the battery, the load resistance value and the temperature of the battery;
(g) predicting a full charge bounceback voltage; and
(h) utilizing the full charge bounceback voltage and the load voltage to rate the strength of the battery,wherein bounceback voltage is a change in voltage after the battery is initially released from a load until a later time, andwherein predicting the full charge bounceback voltage comprises determining the full charge bounceback voltage without subjecting the battery to a high load.
1 Assignment
0 Petitions
Accused Products
Abstract
A method and apparatus for simulating a battery tester with a fixed resistance load, such as a widely used Japanese load tester that rates the strength of Japanese batteries that are categorized under the Japanese Industrial Standard (JIS), are provided. This invention simulates such a device without invoking large current loads, yields familiar results, utilizes an existing database and provides more conclusive testing. The method includes estimating a battery load test voltage as a function of a measured battery dynamic parameter, an open circuit voltage, the load resistance value of the load tester and the battery temperature. A bounceback voltage (BBV) of the battery is also predicted. The BBV, load voltage and battery temperature are utilized to rate the strength of the battery. Also, to improve the accuracy of test results for a substantially discharged battery, one embodiment projects the results of recharging discharged batteries without actually doing so.
506 Citations
14 Claims
-
1. A battery testing method that is based on battery rating standards, the method comprising:
-
(a) measuring a dynamic parameter of the battery; (b) obtaining an open circuit voltage of the battery; (c) obtaining a temperature of the battery; (d) setting a predetermined load resistance value; (e) estimating a full charge dynamic parameter and a full charge open circuit voltage of the battery; (f) estimating a load voltage of the battery as a function of the estimated charged battery dynamic parameter, the charged open circuit voltage of the battery, the load resistance value and the temperature of the battery; (g) predicting a full charge bounceback voltage; and (h) utilizing the full charge bounceback voltage and the load voltage to rate the strength of the battery, wherein bounceback voltage is a change in voltage after the battery is initially released from a load until a later time, and wherein predicting the full charge bounceback voltage comprises determining the full charge bounceback voltage without subjecting the battery to a high load. - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
-
8. An electronic battery tester comprising:
-
a positive connector configured to couple to a positive terminal of the battery; a negative connector configured to couple to a negative terminal of the battery; a voltage sensor configured to measure an open circuit voltage of the battery; an input configured to receive a temperature of the battery; and battery test circuitry configured to; (a) measure a dynamic parameter of the battery using the first and second connectors; (b) estimate a full charge dynamic parameter and a full charge open circuit voltage of the battery; (c) estimate a load voltage of the battery as a function of the estimated charged battery dynamic parameter, the charged open circuit voltage of the battery, a load resistance value and the temperature of the battery; (d) predict a full charge bounceback voltage; and (e) utilize the full charge bounceback voltage and the load voltage to rate the strength of the battery; wherein bounceback voltage is a change in voltage after the battery is initially released from a load until a later time, and wherein the full charge bounceback voltage is predicted by determining the full charge bounceback voltage without subjecting the battery to a high load. - View Dependent Claims (9, 10, 11, 12, 13, 14)
-
Specification