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Electronic battery tester

a battery tester and electromechanical technology, applied in the direction of electrochemical generators, instruments, material analysis, etc., can solve the problems of battery in a relatively discharged condition, time-consuming testing, and the tester must be relatively large, and achieve the effect of overcomplicating nois

Inactive Publication Date: 2001-12-27
MIDTRONICS
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  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

0008] A microprocessor couples to a voltage sensor through an analog to digital converter. The voltage sensor is adapted to be coupled across terminals of a battery. A small current source is also provided and adapted to be coupled across the terminal to the battery. The current source is momentarily switched on to provide a current (which may be a c

Problems solved by technology

However, such a test is time consuming and leaves the battery in a relatively discharged condition.
Further, such a tester must be made relatively large if it is to be used with large batteries.

Method used

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Embodiment Construction

[0014] It has been discovered that measuring battery conductance of a storage battery connected to noise sources is a particularly difficult problem. Such noise sources include the charging system and various electronics in an automobile, for example, or other types of charging systems and electronics which may be connected to storage batteries. These noise sources interfere with the battery test. The present invention includes a number of techniques to overcome the limitations imposed by such noise.

[0015] FIG. 1 is simplified block diagram of a battery tester 10 in accordance with the present invention coupled to an electrical system 4. Electrical system 4 is an model which includes a charge signal noise source 6 and a load signal noise source 8. These sources could be, for example, the load and charger of an automobile or a uninterruptable power system (UPS)

[0016] Battery tester 10 determines the conductance of battery 12 in accordance with the present invention and includes test ...

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Abstract

A microprocessor couples to a voltage sensor through an analog to digital converter. The voltage sensor is adapted to be coupled across terminals of a battery. A small current source is also provided and adapted to be coupled across the terminal to the battery. The current source is momentarily applied to the battery and the resulting change in voltage is monitored using the microprocessor. The microprocessor calculates battery conductance based upon the magnitude of the differential current and the change in voltage and thereby determines the condition of the battery.

Description

[0001] The present invention claims priority to Provisional Application Ser. No. 60 / 035,312, filed Jan. 13, 1997 and entitled "ELECTROINC BATTERY TESTER."BACKGROUND OF THE INEVNTION[0002] The present invention relates to battery testing devices. The present invention is particularly applicable to a technique for measuring conductance of a battery in which a small resistive load is momentarily placed across the battery and the change in voltage is monitored.[0003] Chemical storage batteries, such as lead acid batteries used in automobiles, have existed for many years. In order to make optimum use of such a battery, it is very desirable to test the battery to determine various battery parameters such as state of charge, battery capacity, state of health, the existence of battery defects.[0004] Various techniques have been used to measure battery parameters. For example, hygrometers have been used to measure the specific gravity of a battery and simple voltage measurements have been us...

Claims

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Application Information

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IPC IPC(8): G01R31/36H01M10/48
CPCG01R31/36G01R31/3662H01M10/48G01R31/389Y02E60/10
Inventor BERTNESS, KEVIN I.
Owner MIDTRONICS