Method and means for total battery voltage testing

• US 3,356,936 A
• Filed: 02/12/1964
• Issued: 12/05/1967
• Est. Priority Date: 02/12/1964
• Status: Expired due to Term

• Current Assignee: Leonard S. Smith
• Original Assignee: Leonard S. Smith
• Inventors: Smith, Leonard S.
• Application Number:
  US04/344,344
• Time in Patent Office: 1,392 Days
• US Class Current: 324/429
• CPC Class Codes: G01R 31/378 specially adapted for the type of battery or accumulator

Claims

1. THE IMPROVED METHOD FOR DETECTING FAULTY STORAGE BATTERIES AT VARIOUS STATES OF CHANGE BY MEASURING TOTAL BATTERY VOLTAGE COMPRISING THE STEPS OF CONNECTING A NOLOAD, HIGH RESISTANCE, LOW CURRENT CIRCUIT INCLUDING A SELECTIVELY VARIABLE RESISTANCE IN SERIES WITH A VOLTMETER ACROSS THE TERMINALS OF THE BATTERY UNDER TEST;

SELECTIVELY ADJUSTING SAID VARIABLE RESISTANCE TO OBTAIN A PREDETERMINED READING ON THE VOLTMETER;

THE ADJUSTED POSITION OF SAID VARIABLE RESISTANCE INDICATING THE RELATIVE STATE OF CHARGE OF THE BATTERY UNDER TEST;

CLOSING A SWITCH TO CONNECT A LOAD OF PREDETERMINED MAGNITUDE TO THE BATTERY UNDER TEST, CONNECTING A TEMPERATURE SENSITIVE ELEMENT, LOCATED IN THE ELECTROLYTE OF ONE CELL OF THE BATTERY UNDER TEST, IN PARALLEL WITH SAID VOLTMETER WHILE SAID LOAD IS CONNECTED TO THE BATTERY UNDER TEST TO AUTOMATICALLY COMPENSATE THE VOLTMETER READING FOR BATTERY TEMPERATURE;

AND CAUSING THE VOLTMETER READING TO DROP NO MORE THAN A PREDETERMINED AMOUNT IF THE BATTERY UNDER TEST IS GOOD AND TO DROP AN AMOUNT GREATER THAN SAID PREDETERMINED AMOUNT IF SAID BATTERY IS FAULTY, SAID PREDETERMINED AMOUNT BEING DEPENDENT UPON THE SIZE OF THE BATTERY BEING TESTED.