Automated data storing battery tester and multimeter

• US 5,744,962 A
• Filed: 03/14/1995
• Issued: 04/28/1998
• Est. Priority Date: 03/14/1995
• Status: Expired due to Term

• Current Assignee: Albercorp
• Original Assignee: Albercorp
• Inventors: Deveau, Edward W., Alber, Glenn
• Primary Examiner(s): Regan, Maura K.
• Application Number:
  US08/404,031
• Time in Patent Office: 1,141 Days
• Field of Search: 324/427, 324/433, 324/429, 324/430, 340/636, 340/48
• US Class Current: 324/426
• CPC Class Codes: G01R 31/3648 comprising digital calculation means, e.g. for performing an algorithm
• CPC Class Codes: G01R 31/385 Arrangements for measuring battery or accumulator variables for monitoring G01R31/382
• CPC Class Codes: G01R 31/386 using test-loads

Abstract

An intelligent automated battery multimeter system having data storing and multi-cell reading capabilities in a self-contained unit for automatically performing in-service DC load testing on battery cells without requiring the removal of battery chargers wherein the tester measures, records and displays load voltages, float voltages, internal cell resistance, intercell connection resistance and other cell integrity measurements. The battery tester is also computer compatible wherein it provides PC links for extracting data from the system and downloading it into computer networks.

Claims

1. A data storing battery tester and multimeter for testing at least one battery in a plurality of batteries to predict whether said battery can provide a predetermined power level by determining at least the battery internal cell resistance, said battery being electrically connected in series by at least one conductive intercell link, said battery and batteries being connected to and used to supply power in electrical systems, said tester comprising:

an adjustable direct current (DC) resistance load;

resistance loading means, in electrical communication with said adjustable load, for selectively and automatically applying and removing said adjustable load across said battery while said battery remains connected to the electrical system to facilitate a load voltage and a float voltage, respectively, and to draw current;

processor means, in electrical communication with said resistance loading means, for reading said load voltage, said float voltage and said current draw and for calculating resistance of the intercell link and said internal cell resistance using said voltages and said current draw;

wherein said load voltage, float voltage, current draw, intercell link resistance and internal cell resistance comprise data, said processor means including a prediction means for determining whether the battery can provide the predetermined power level based on said data;

memory means, in electrical communication with said processor means, for storing an algorithm used by said processor means to read and calculate said data and for storing said data

computer interface means, in electrical communication with said processor means, for communicating and interfacing with at least one computer peripheral to facilitate transferring said data to said computer; and

signal control means, in electrical communication with said resistance loading means and said processor means, for receiving input command signals and electrically providing output control signals to said processor means to facilitate the applying and removing of said adjustable load from said battery and processing of said data.

2. A battery tester as recited in claim 1, wherein said processor means comprises a microprocessor.

3. A battery tester as recited in claim 2, wherein said tester further comprises:

signal transfer means, in electrical communication with said processor means, memory means and resistance loading means, for electrically interfacing said processor means, memory means and resistance loading means for allowing said data to be transferred in multiple bytes.

4. A battery tester as recited in claim 3, wherein said resistance loading means further comprises means for amplifying signals generated by said battery to facilitate processing of said load and float voltages.

5. A battery tester as recited in claim 4, further comprising user interface means, in communication with said processor, for allowing a user to select and control said resistance loading means to control the applying and removing of said adjustable load.

6. A battery tester as recited in claim 2, wherein said resistance loading means comprises:

a load module driver in electrical communication with said adjustable load; and

a plurality of electrically controlled switches electrically controlled by said load module driver for applying and removing said adjustable load.

7. A battery tester as recited in claim 1, wherein said tester further comprises:

multiplexor means, in electrical communication with said processor means and said resistance loading means, for receiving analog signals indicating said load and float voltage and said current draw and for directing said signals to said processor means in a predetermined order to predetermined locations in said processor means.

8. A battery tester for predicting whether a battery in a plurality of batteries will be able to provide required power to a known load based on at least internal cell resistance in said battery and intercell resistance of a conductive link electrically joining said battery to said plurality of batteries, said battery and batteries being connected to used to supply power to an electrical system, said tester comprising:

an adjustable direct current (DC) resistance load;

resistance loading means, in electrical communication with said adjustable load, for selectively and automatically applying and removing said adjustable load across said battery while said battery remains connected to the electrical system to facilitate a load voltage and a float voltage, respectively and to a current draw;

a programmable processor means, in electrical communication with said resistance loading means, for reading said load and float voltages and said current draw and for calculating said internal cell resistance and intercell resistance using said voltages and said current draw, wherein said load voltage, float voltage, current draw, intercell resistance and internal cell resistance comprise data, said processor means including a prediction means for determining whether the battery can provide the predetermined power level based on said data;

memory means, in electrical communication with said processor means, for storing an algorithm used by said processor means to read and calculate said data and for storing said data;

parallel input-output (I/O) controller, in electrical communication with said resistance loading means and said processor means, for receiving input command signals and electrically providing output control signals to said processor means to facilitate the applying and removing of said adjustable load from said battery and processing of said data; and

user interface means, in electrical communication with said parallel I/O controller and said processor, for initiating said processor means and said resistance loading means to control the applying and removing of said adjustable load and to determine whether said battery can provide said required power.

9. A battery tester as recited in claim 8, wherein said tester further comprises:

an analog-to-digital converter, in electrical communication with said signal control means and said processor means; and

multiplexor means, in electrical communication with said processor means, said analog-to-digital converter and said resistance loading means, for receiving analog signals indicating said load and float voltage and said current draw, for sending selected signals from said analog signals to said analog-to-digital converter to convert to digital signals, and for directing said analog signals to said processor means in a predetermined order to predetermined locations in said processor means.

10. A battery tester as recited in claim 9, wherein said tester further comprises:

computer interface means, in electrical communication with said processor means, for communicating and interfacing with at least one computer peripheral to facilitate transfering said data to said computer.

11. A battery tester as recited in claim 10, wherein said tester further comprises:

amplifier means, in electrical communication with said resistance loading means, for amplifying signals comprising said load and float voltages to facilitate processing; and

voltage divider means, in electrical communication with said multiplexor means, for reducing voltage levels in signals comprising said load and float voltages.

12. A battery tester for predicting whether a battery in a plurality of batteries will be able to provide required power to a known load based on at least internal cell resistance in said battery and intercell resistance of a conductive link electrically joining said battery to said plurality of batteries, said battery and batteries being connected to used to supply power to an electrical system, said tester comprising:

an adjustable direct current (DC) resistance load;

resistance loading means, in electrical communication with said adjustable load, for selectively and automatically applying and removing said adjustable load across said battery while said battery remains connected to the electrical system to facilitate a load voltage and a float voltage, respectively and to a current draw;

a programmable processor means, in electrical communication with said resistance loading means, for reading said load and float voltages and said current draw and for calculating said internal cell resistance and intercell resistance using said voltages and said current draw, wherein said load voltage, float voltage, current draw, intercell resistance and internal cell resistance comprise data, said processor means including a prediction means for determining whether the battery can provide the predetermined power level based on said data;

memory means, in electrical communication with said processor means, for storing an algorithm used by said processor means to read and calculate said data and for storing said data;

parallel input-output (I/O) controller, in electrical communication with said resistance loading means and said processor means, for receiving input command signals and electrically providing output control signals to said processor means to facilitate the applying and removing of said adjustable load from said battery and processing of said data;

computer interface means, in electrical communication with said processor means, for communicating and interfacing with at least one computer peripheral to facilitate transferring said data to said computer; and

user interface means, in electrical communication with said parallel I/O controller and said processor, for initiating said processor means and said resistance loading means to control the applying and removing of said adjustable load and to determine whether said battery can provide said required power.

13. A battery tester as recited in claim 12, wherein said tester further comprises:

an analog-to-digital converter, in electrical communication with said signal control means and said processor means; and

multiplexor means, in electrical communication with said processor means, said analog-to-digital converter and said resistance loading means, for receiving analog signals indicating said load and float voltage and said current draw, for sending selected signals from said analog signals to said analog-to-digital converter to convert to digital signals, and for directing said analog signals to said processor means in a predetermined order to predetermined locations in said processor means.

14. A battery tester as recited in claim 13, wherein said resistance loading means comprises:

a load module driver in electrical communication with said adjustable load; and

a plurality of electrically controlled switches in electrically controlled by said load module driver.

15. A battery tester as recited in claim 14, wherein said tester further comprises:

amplifier means, in electrical communication with said resistance loading means, for amplifying signals comprising said load and float voltages to facilitate processing; and

voltage divider means, in electrical communication with said multiplexor means, for reducing voltage levels in signals comprising said load and float voltages.