1
George R Seyfang: Battery state of charge indicator. British Aerospace Public Company, Cushman Darby & Cushman, August 14, 1990: US04949046 (161 worldwide citation)

A device for indicating changes in the state of charge of a rechargeable battery including a current sensor to sense current flow into and out of the battery and to provide an output indicative of both the magnitude and direction of the current flow, a timer to provide a timing signal, and a compute ...


2
Joe C Lambert: Battery state of charge indicator. General Electric Company, Richard A Menelly, Fred Jacob, June 2, 1992: US05119011 (65 worldwide citation)

A method for measuring and storing the state of charge of batteries, such as used in electric vehicles. The stored charge value is initially derived from the value of battery terminal voltage measured prior to connection of the battery to the load, e.g. the traction motor. While the battery is conne ...


3
Richard L Proctor, George A Ure, William L Merkes, Richard H Young Jr, Steven H Kahle: Accurate battery state-of-charge monitoring and indicating apparatus and method. Cruising Equipment, Christenson O Connor Johnson & Kindness PLLC, August 12, 1997: US05656919 (52 worldwide citation)

The apparatus and method of monitoring and/or indicating an accurate state-of-charge of a battery compensates for varying current loads and changing temperature conditions. The apparatus and method compensate for the Peukert Effect which manifests itself when varying current loads are applied to the ...


4
John C Bailey: Battery with coulometric state of charge indicator. Eveready Battery Company, Robert W Welsh, May 23, 1995: US05418086 (38 worldwide citation)

A thin film coulometer for use as a battery state of charge indicator in which the indicator is located on a battery and connected in parallel across a current path of a resistive segment of the battery so that during discharge, the coulometer can be observed to indicate the capacity of the battery. ...


5
Seyfang George Reginald: Battery state of charge indicator.. British Aerospace, June 10, 1987: EP0225106-A1 (36 worldwide citation)

A device (1) for indicating changes in the state of charge of a rechargeable battery (2) comprises a current sensor (6) to sense current flow into and out of the battery (2) and to provide an output indicative of both the magnitude and direction of the current flow, timing means (11) to provide a ti ...


6
Eugene P Finger: Battery state of charge indicator operating on bidirectional integrations of terminal voltage. Curtis Instruments, Curtis Ailes, June 14, 1983: US04388618 (35 worldwide citation)

Battery terminal voltage is measured on a continuing basis during both positive and negative voltage excursions with relation to a summed reference value to obtain a measured difference. The resultant measured difference causes the generation of convergence function signals which vary dependent upon ...


7
Chiku Takewo, Yamamoto Shin, Huruhashi Mikio: Battery state-of-charge indicator. Kabushiki Kaisha Toyota Chuo Kenkyusho, Berman Bishoff & Platt, May 27, 1975: US3886442 (34 worldwide citation)

A battery state-of-charge indicator to accurately measure and indicate the actual state-of-charge of a secondary battery, which comprises a compensation circuit for converting a discharging current of the battery to a compensated current substantially satisfying an equation I=mI.sub.B.sup.n and an i ...


8
Terrill Atwater, Richard M Dratler: Universal inexpensive battery state-of-charge indicator. The United States of America represented by the Secretary of the Army, Michael Zelenka, William H Anderson, December 13, 1994: US05372898 (33 worldwide citation)

A discharge level monitor for a battery. The current flowing from the monred battery is passed through a sensing resistor. The voltage across the resistor is amplified and integrated over time and the result of the integration is stored in a capacitor. The capacitor is discharged by a switch control ...


9
Edward R Hein, Gerald D Hudack, John F Bear, Scott J Cronrath: Storage battery state-of-charge indicator. Exide Corporation, Nixon & Vanderhye, March 5, 1996: US05496658 (30 worldwide citation)

A storage battery is provided which includes a casing and a cover secured to the casing. The cover includes a body having a top surface and a peripheral skirt; the top surface having a plurality of vent apertures, at least one negative terminal and at least one positive terminal, and an elongated re ...


10
Charles E Konrad, Richard K Davis: Battery state-of-charge indicator. General Electric Company, Walter C Bernkopf, Robert A Cahill, November 18, 1980: US04234840 (30 worldwide citation)

A circuit for indicating the charge state of a battery supplying discharge current to its load circuit under actual load operation during which battery discharge current is subject to magnitude variations and interruptions, having means for storing a stored signal whose value is representative of ba ...