Battery level indicator

• US 3,343,152 A
• Filed: 01/21/1966
• Issued: 09/19/1967
• Est. Priority Date: 01/21/1966
• Status: Expired due to Term

• Current Assignee: Atlee S. Hart
• Original Assignee: Atlee S. Hart
• Inventors: Hart, Atlee S.
• Application Number:
  US04/522,202
• Time in Patent Office: 606 Days
• US Class Current: 340/517
• CPC Class Codes: G01F 23/243 Schematic arrangements of probes combined with measuring circuits
• CPC Class Codes: H01M 10/484 for measuring electrolyte level, electrolyte density or electrolyte conductivity
• CPC Class Codes: H01M 50/569 Constructional details of current conducting connections for detecting conditions inside cells or batteries, e.g. details of voltage sensing terminals battery terminal connectors with integrated measuring arrangements G01R31/364
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

Claims

1. LIQUID LEVEL INDICATOR MEANS FOR A MULTI-CELL BATTERY COMPRISING AN ELECTRICALLY CONDUCTIVE PROBE FOR EACH CELL, EACH PROBE TERMINATING WITHIN THE CELL APPROXIMATELY AT THE LOWEST SAFE OPERATING ELECTROLYTE LEVEL;

SAID PROBES BEING DIVIDED INTO FIRST AND SECOND GROUPS, THE FIRST GROUP BEING ASSOCIATED WITH ELECTROLYTE WHICH IS MORE NEGATIVE THAN THAT OF THE SECOND GROUP;

A SOURCE OF POSITIVE VOLTAGE;

A FIRST GROUP OF PNP TRANSISTORS HAVING THEIR RESPECTIVE BASES CONNECTED TO RESPECTIVE PROBES IN THE FIRST GROUP, AND THEIR EMITTER-COLLECTOR CIRCUITS IN A SERIES CIRCUIT INITIATING AT THE SOURCE OF POSITIVE VOLTAGE;

A SIGNAL TRANSISTOR HAVING ITS EMITTER-COLLECTOR CIRCUIT CONNECTED WITH THE AFOREMENTIONED SERIES CIRCUIT;

A SECOND GROUP OF NPN TRANSISTORS HAVING THEIR RESPECTIVE BASES CONNECTED TO RESPECTIVE PROBES IN THE SECOND GROUP, AND THEIR COLLECTOR-