WO1999005538A1 - Instantaneous capacity indication of a secondary element - Google Patents

Instantaneous capacity indication of a secondary element Download PDF

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Publication number
WO1999005538A1
WO1999005538A1 PCT/DE1998/002055 DE9802055W WO9905538A1 WO 1999005538 A1 WO1999005538 A1 WO 1999005538A1 DE 9802055 W DE9802055 W DE 9802055W WO 9905538 A1 WO9905538 A1 WO 9905538A1
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WO
WIPO (PCT)
Prior art keywords
charge
secondary element
voltage
temperature
measured
Prior art date
Application number
PCT/DE1998/002055
Other languages
German (de)
French (fr)
Inventor
Erich Kamperschroer
Thomas Fischedick
Original Assignee
Siemens Aktiengesellschaft
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens Aktiengesellschaft filed Critical Siemens Aktiengesellschaft
Publication of WO1999005538A1 publication Critical patent/WO1999005538A1/en

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/385—Arrangements for measuring battery or accumulator variables
    • G01R31/387—Determining ampere-hour charge capacity or SoC
    • G01R31/388—Determining ampere-hour charge capacity or SoC involving voltage measurements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/44—Methods for charging or discharging
    • H01M10/443—Methods for charging or discharging in response to temperature
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
    • H01M10/486—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for measuring temperature
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
    • H02J7/0048—Detection of remaining charge capacity or state of charge [SOC]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Definitions

  • the subject of the application relates to a method for determining the current state of charge of a secondary element.
  • B. mobile telecommunications terminals are generally with interchangeable, rechargeable cells such. B. with NiCd batteries operating voltage.
  • a display device can be provided in the device to indicate the charge status of the accumulator.
  • a capacity display which works according to the charge balance method, shows the state of charge with sufficient accuracy after going through a charge cycle. If the accumulator is replaced, an immediate correct capacity indication is not given.
  • One solution is to set the capacity display to an empty or medium charge state when inserting an accumulator with an unknown charge state.
  • the object of the application is based on the problem of creating a method for operating the display device which, even after the insertion of an accumulator with an unknown state of charge, provides an accurate indication of the state of charge of the accumulator.
  • the subject of the application makes use of the knowledge that the state of charge of the rechargeable battery can be inferred directly and with sufficient accuracy from the combination of the temperature and the voltage of the rechargeable battery, as a result of which uncertainties relate to fend the state of charge of the battery are avoided.
  • a user who uses an accumulator with an unknown state of charge thus immediately receives a statement about the expected operating time of the device.
  • the formation of value ranges brings with it a reduction in the values to be stored, which is accompanied by a corresponding reduction in effort.
  • an automatic sequence is provided when a circuit arrangement is subjected to the operating voltage of the secondary element again. This measure brings with it an automatic and user-friendly display of the current charge state when the battery is inserted.
  • Figure 1 shows characteristic voltage profiles of a secondary element over the stored amount of charge with the temperature as a parameter.
  • FIG. 1 shows the charge voltage curve of a secondary element, which was determined in a laboratory test, which may be given by a NiCd (nickel-cadmium) accumulator or a NiMH (nickel metal hydride) accumulator, over the amount of charge of the secondary element.
  • the voltage curve is shown with the temperature as a parameter, the voltage curve for a temperature of 0 ° C and the voltage curve for a temperature of 45 ° C being shown as examples.
  • the voltage of the secondary element increases monotonically with the amount of charge, a higher gradient and higher voltage values being given at a higher temperature.
  • the amount of charge is plotted as a percentage of the nominal capacity (NK) of the secondary element. In the exemplary embodiment there are four charge value ranges.
  • a first charge value range for which an indication of 0% of the capacity is displayed, for 20 to 40% of the nominal capacity
  • a second charge value range for which an indication of 33% the capacity takes place
  • a third charge value range for which an indication of 66% of the capacity takes place and for 70 to 100% of the nominal capacity there is a fourth charge value range, for which an indication of
  • the voltages at the limits of the charge value ranges define voltage value ranges.
  • the voltages at the limits of the charge value ranges are stored separately in an assignment table for the different temperatures.
  • the allocation table may be implemented in a semiconductor memory.
  • the number of voltage value ranges determines the resolution of the capacity display.
  • the temperature and the voltage of the Se ⁇ kundärelements is measured.
  • the voltage is assigned to the voltage range in which it falls and the temperature to the temperature range in which it falls.
  • the respectively assigned voltage value range and the respectively assigned temperature value range are fed to the assignment table as input variables.
  • the stored charge value range is output for the current temperature.
  • the respective charge value range can be shown as a symbolic graphic representation on a display device or as an alphanumeric output on a display device.
  • the symbolic graphic representation can, for example, be countered by the stylized outline of an individual battery cell. ben, in which the state of charge is symbolized by a level.
  • the subject of the application may be implemented in a mobile telecommunications terminal with an LCD (Liquid Cristal Display) display device, such as the handset of a cordless telephone, or in a cell phone (cell phone). If the operating voltage of the secondary element is again applied to the mobile telecommunication terminal, the method on which the object of the application is based runs automatically, the state of charge of the secondary element being displayed in the display device of the mobile telecommunication terminal.
  • LCD Liquid Cristal Display

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Secondary Cells (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Tests Of Electric Status Of Batteries (AREA)

Abstract

A capacity indicator displaying the charge of a secondary element such as a nickel cadmium (NiCd) battery or a nickel metal hydride (NiMH) battery indicates the charge on the basis of the voltage and the temperature of the secondary element. The capacity indicator provides immediate charge information of a battery having an unknown charge.

Description

Beschreibung τ_Description τ_
Unverzügliche Kapazitätsanzeige eines SekundärelementsImmediate capacity display of a secondary element
Der Anmeldungsgegenstand betrifft ein Verfahren zur Ermittlung des augenblicklichen Ladezustandes eines Sekundärelements.The subject of the application relates to a method for determining the current state of charge of a secondary element.
Netzunabhängig betriebene elektrische Geräte mit erhöhtem Stromverbrauch, wie z . B. mobile Telekommunikationsendgeräte, werden allgemein mit auswechselbaren, wiederaufladbaren Zellen, wie z. B. mit NiCd -Akkumulatoren betriebsspannungsversorgt. Zur Anzeige des Ladezustandes des Akkumulators kann in dem Gerät eine Anzeigeeinrichtung vorgesehen sein. Eine Kapa- zitätsanzeige, die nach dem Ladungsbilanz-Verfahren arbeitet, zeigt nach Durchlaufen eines Ladezyklus' den Ladezustand mit ausreichender Genauigkeit an. Wird der Akkumulator ausgetauscht, ist eine unmittelbare korrekte Kapazitätsanzeige nicht gegeben.Independently operated electrical devices with increased power consumption, such as. B. mobile telecommunications terminals are generally with interchangeable, rechargeable cells such. B. with NiCd batteries operating voltage. A display device can be provided in the device to indicate the charge status of the accumulator. A capacity display, which works according to the charge balance method, shows the state of charge with sufficient accuracy after going through a charge cycle. If the accumulator is replaced, an immediate correct capacity indication is not given.
Ein Behelf besteht darin, bei Einsetzen eines Akkumulators mit unbekanntem Ladezustand die Kapazitätsanzeige auf einen leeren oder einen mittleren Ladezustand einzustellen.One solution is to set the capacity display to an empty or medium charge state when inserting an accumulator with an unknown charge state.
Dem Anmeldungsgegenstand liegt das Problem zugrunde ein Verfahren zum Betrieb der Anzeigeeinrichtung zu schaffen, das auch unmittelbar nach Einsetzen eines Akkumulators mit unbekanntem Ladezustand eine zutreffende Anzeige des Ladezustandes des Akkumulators erbringt.The object of the application is based on the problem of creating a method for operating the display device which, even after the insertion of an accumulator with an unknown state of charge, provides an accurate indication of the state of charge of the accumulator.
Das Problem wird durch die Merkmale des Anspruchs 1 gelöstThe problem is solved by the features of claim 1
Der Anmeldungsgegenstand macht sich die Erkenntnis zunutze, daß aus der Kombination der Temperatur und der Spannung des Akkumulators unmittelbar und mit ausreichender Genauigkeit für eine Kapazitätsanzeige auf den Ladezustand des Akkumulators geschlossen werden kann, wodurch Unsicherheiten betref- fend den Ladezustand des Akkumulators vermieden sind. Ein Benutzer, der einen Akkumulator mit unbekanntem Ladezustand einsetzt, erhält also unmittelbar eine Aussage über die zu erwartende Betriebsdauer des Geräts. Die Bildung von Wertebe- reichen bringt mit abnehmender Anforderung an die Genauigkeit der Anzeige eine Verringerung der abzuspeichernden Werte mit sich, womit eine entsprechende Verringerung des Aufwands einhergeht.The subject of the application makes use of the knowledge that the state of charge of the rechargeable battery can be inferred directly and with sufficient accuracy from the combination of the temperature and the voltage of the rechargeable battery, as a result of which uncertainties relate to fend the state of charge of the battery are avoided. A user who uses an accumulator with an unknown state of charge thus immediately receives a statement about the expected operating time of the device. With decreasing demands on the accuracy of the display, the formation of value ranges brings with it a reduction in the values to be stored, which is accompanied by a corresponding reduction in effort.
Gemäß einer besonderen Weiterbildung des Anmeldungsgegenstandes ist ein selbsttätiger Ablauf bei neuerlicher Beaufschlagung einer Schaltungsanordnung mit der Betriebsspannung des Sekundärelements vorgesehen. Diese Maßnahme bringt eine automatische und benutzerfreundliche Anzeige des momentanen La- dungszustandes bei Einsetzen des Akkumulators mit sich.According to a special development of the subject of the application, an automatic sequence is provided when a circuit arrangement is subjected to the operating voltage of the secondary element again. This measure brings with it an automatic and user-friendly display of the current charge state when the battery is inserted.
Der Anmeldungsgegenstand wird im folgenden als Ausführungs- beispiel in einem zum Verständnis erforderlichen Umfang anhand einer Figur näher beschrieben.The subject matter of the application is described in more detail below with reference to a figure as an exemplary embodiment to the extent necessary for understanding.
Figur 1 zeigt charakteristische Spannungsverläufe eines Sekundärelements über der gespeicherten Ladungsmenge mit der Temperatur als Parameter.Figure 1 shows characteristic voltage profiles of a secondary element over the stored amount of charge with the temperature as a parameter.
Figur 1 zeigt den in einem Laborversuch ermittelten Ladespannungsverlauf eines Sekundärelements, das durch einen NiCd (Nickel-Kadmium) -Akkumulator oder einen NiMH (Nickel Metal Hydrid) -Akkumulator gegeben sein mag, über der Ladungsmenge des Sekundärelements. Der Spannungsverlauf ist mit der Tempe- ratur als Parameter dargestellt, wobei exemplarisch der Spannungsverlauf für eine Temperatur von 0°C und der Spannungsverlauf für eine Temperatur von 45°C dargestellt sind. Die Spannung des Sekundärelements ist mit der Ladungsmenge monoton steigend, wobei bei höherer Temperatur ein größerer Gradient und höhere Spannungswerte gegeben sind. Die Ladungsmenge ist in Prozent der Nennkapazität (NK) des Sekundärelements aufgetragen. Im Ausführungsbeispiel sind vier Ladungs-Wertebereiche gegeben. Für 0 bis 20% der Nennkapazität wird ein erster Ladungs- Wertebereich, für den eine Anzeige von 0% der Kapazität er- folgt, für 20 bis 40% der Nennkapazität wird ein zweiter La- dungs-Wertebereich, für den eine Anzeige von 33% der Kapazität erfolgt, für 40 bis 70% der Nennkapazität wird ein dritter Ladungs-Wertebereich, für den eine Anzeige von 66% der Kapazität erfolgt und für 70 bis 100% der Nennkapazität wird ein vierter Ladungs-Wertebereich, für den eine Anzeige vonFIG. 1 shows the charge voltage curve of a secondary element, which was determined in a laboratory test, which may be given by a NiCd (nickel-cadmium) accumulator or a NiMH (nickel metal hydride) accumulator, over the amount of charge of the secondary element. The voltage curve is shown with the temperature as a parameter, the voltage curve for a temperature of 0 ° C and the voltage curve for a temperature of 45 ° C being shown as examples. The voltage of the secondary element increases monotonically with the amount of charge, a higher gradient and higher voltage values being given at a higher temperature. The amount of charge is plotted as a percentage of the nominal capacity (NK) of the secondary element. In the exemplary embodiment there are four charge value ranges. For 0 to 20% of the nominal capacity, a first charge value range, for which an indication of 0% of the capacity is displayed, for 20 to 40% of the nominal capacity, a second charge value range, for which an indication of 33% the capacity takes place, for 40 to 70% of the nominal capacity there is a third charge value range, for which an indication of 66% of the capacity takes place and for 70 to 100% of the nominal capacity there is a fourth charge value range, for which an indication of
100% der Kapazität erfolgt, zugeordnet. Die Spannungen an den Grenzen der Ladungs-Wertebereiche legen Spannungs- Wertebereiche fest. Die Spannungen an den Grenzen der Ladungs-Wertebereiche werden in einer Zuordnungs-Tabelle für die verschiedenen Temperaturen gesondert abgespeichert. Die Zuordnungs-Tabelle mag in einem Halbleiterspeicher implementiert sein.100% of the capacity is assigned. The voltages at the limits of the charge value ranges define voltage value ranges. The voltages at the limits of the charge value ranges are stored separately in an assignment table for the different temperatures. The allocation table may be implemented in a semiconductor memory.
Die Anzahl der Spannungs-Wertebereiche legt die Auflösung der Kapazitätsanzeige fest.The number of voltage value ranges determines the resolution of the capacity display.
Zur Ermittlung des augenblicklichen Ladungszustandes des Sekundärelements wird die Temperatur und die Spannung des Se¬ kundärelements gemessen. Die Spannung wird dem Spannungs- Wertebereich, in den sie fällt und die Temperatur dem Temperatur-Wertebereich, in den sie fällt zugeordnet. Der jeweils zugeordnete Spannungs-Wertebereich und der jeweils zugeordnete Temperatur-Wertebereich werden der Zuordnungstabelle als Eingangsgrößen zugeführt. Je nachdem, in welchen Spannungs- Wertebereich die augenblicklich gemessene Spannung fällt, wird für die augenblickliche Temperatur der abgespeicherte Ladungs-Wertebereich ausgegeben. Der jeweilige Ladungs- Wertebereich kann als sinnbildliche grafische Darstellung auf einer Anzeigeeinrichtung dargestellt oder als alphanumerische Ausgabe auf einer Anzeigeeinrichtung dargestellt sein. Die sinnbildliche grafische Darstellung kann beispielsweise durch die stilisierten Umrisse einer einzelnen Batteriezelle gege- ben sein, in der der Ladezustand durch einen Füllstand symbolisiert ist.To determine the instantaneous state of charge of the secondary element, the temperature and the voltage of the Se ¬ kundärelements is measured. The voltage is assigned to the voltage range in which it falls and the temperature to the temperature range in which it falls. The respectively assigned voltage value range and the respectively assigned temperature value range are fed to the assignment table as input variables. Depending on the voltage range in which the currently measured voltage falls, the stored charge value range is output for the current temperature. The respective charge value range can be shown as a symbolic graphic representation on a display device or as an alphanumeric output on a display device. The symbolic graphic representation can, for example, be countered by the stylized outline of an individual battery cell. ben, in which the state of charge is symbolized by a level.
Der Anmeldungsgegenstand mag in einem mobilen Telekommunika- tionsendgerät mit einer LCD (Liquid Cristal Display)- Anzeigeeinrichtung wie zum Beispiel dem Mobilteil eines Schnurlostelefons oder in einem Mobiltelefon (Handy) realisiert sein. Wird das mobile Telekommunikationsendgerät neuerlich mit der Betriebsspannung des Sekundärelements beaufschlagt, läuft das dem Anmeldungsgegenstand zugrundeliegende Verfahren selbsttätig ab, wobei der Ladezustand des Sekundärelements in der Anzeigeeinrichtung des mobilen Telekommunikationsendgeräts angezeigt wird. The subject of the application may be implemented in a mobile telecommunications terminal with an LCD (Liquid Cristal Display) display device, such as the handset of a cordless telephone, or in a cell phone (cell phone). If the operating voltage of the secondary element is again applied to the mobile telecommunication terminal, the method on which the object of the application is based runs automatically, the state of charge of the secondary element being displayed in the display device of the mobile telecommunication terminal.

Claims

Patentansprüche 5 Claims 5
1. Verfahren zur Ermittlung des augenblicklichen Ladezustandes eines Sekundärelements demzufolge - für mehrere Temperaturen (1, 2) jeweils der Verlauf der1. Method for determining the current state of charge of a secondary element accordingly - for several temperatures (1, 2) the course of each
Spannung (V) des Sekundärelements in Abhängigkeit von der Ladungsmenge (NK) des Sekundärelements ermittelt wird,Voltage (V) of the secondary element is determined as a function of the amount of charge (NK) of the secondary element,
- für die Ladungsmenge mehrere Ladungs-Wertebereiche (0..20%, 20..40%, 40..70%, 70..100%) festgelegt werden, - den Ladungs-Wertebereichen nach Maßgabe der Temperatur jeweilige Spannungs-Wertebereiche zugeordnet werden- Several charge value ranges (0..20%, 20..40%, 40..70%, 70..100%) are defined for the amount of charge, - the respective voltage value ranges are assigned to the charge value ranges according to the temperature become
- die Temperatur des Sekundärelements gemessen wird- The temperature of the secondary element is measured
- die Spannung des Sekundärelements gemessen wird- The voltage of the secondary element is measured
- nach Maßgabe der gemessenen Spannung und der gemessenen Temperatur der zugehörige Ladungs-Wertebereich des Sekundärelements zugeordnet wird- The associated charge value range of the secondary element is assigned in accordance with the measured voltage and the measured temperature
- der ermittelte Ladungs-Wertebereich angezeigt wird.- The determined charge value range is displayed.
2. Verfahren nach Anspruch 1, gekennzeichnet durch einen selbsttätigen Ablauf bei neuerlicher Beaufschlagung einer Schaltungsanordnung mit der Betriebsspannung des Sekundärelements . 2. The method according to claim 1, characterized by an automatic sequence when a circuit arrangement is again subjected to the operating voltage of the secondary element.
PCT/DE1998/002055 1997-07-25 1998-07-22 Instantaneous capacity indication of a secondary element WO1999005538A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19732128A DE19732128A1 (en) 1997-07-25 1997-07-25 Immediate capacity display of a secondary element
DE19732128.3 1997-07-25

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WO1999005538A1 true WO1999005538A1 (en) 1999-02-04

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Cited By (1)

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FR2815729A1 (en) * 2000-10-24 2002-04-26 Isa France Sa Device to show status of watch batteries

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EP0280916A1 (en) * 1987-02-25 1988-09-07 ELEKTRON-BREMEN Fabrik für Elektrotechnik GmbH Process and appliance for monitoring the working condition of a battery-driven vehicle
EP0359237A2 (en) * 1988-09-13 1990-03-21 Nec Corporation Apparatus for displaying the remaining charge of rechargeable battery
FR2645352A1 (en) * 1989-03-31 1990-10-05 Mitsubishi Electric Corp DEVICE FOR INDICATING THE RESIDUAL CAPACITY OF A BATTERY
US5185566A (en) * 1990-05-04 1993-02-09 Motorola, Inc. Method and apparatus for detecting the state of charge of a battery
EP0566264A1 (en) * 1992-04-16 1993-10-20 International Business Machines Corporation Battery operated computer having improved battery gauge and system for measuring battery charge
EP0713101A2 (en) * 1994-11-21 1996-05-22 Seiko Epson Corporation Remaining battery capacity meter and method for computing remaining capacity
US5539318A (en) * 1992-07-16 1996-07-23 Toyota Jidosha Kabushiki Kaisha Residual capacity meter for electric car battery
FR2748115A1 (en) * 1996-04-25 1997-10-31 Europ Accumulateurs Car battery charge measuring device

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EP0280916A1 (en) * 1987-02-25 1988-09-07 ELEKTRON-BREMEN Fabrik für Elektrotechnik GmbH Process and appliance for monitoring the working condition of a battery-driven vehicle
EP0359237A2 (en) * 1988-09-13 1990-03-21 Nec Corporation Apparatus for displaying the remaining charge of rechargeable battery
FR2645352A1 (en) * 1989-03-31 1990-10-05 Mitsubishi Electric Corp DEVICE FOR INDICATING THE RESIDUAL CAPACITY OF A BATTERY
US5185566A (en) * 1990-05-04 1993-02-09 Motorola, Inc. Method and apparatus for detecting the state of charge of a battery
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US5539318A (en) * 1992-07-16 1996-07-23 Toyota Jidosha Kabushiki Kaisha Residual capacity meter for electric car battery
EP0713101A2 (en) * 1994-11-21 1996-05-22 Seiko Epson Corporation Remaining battery capacity meter and method for computing remaining capacity
FR2748115A1 (en) * 1996-04-25 1997-10-31 Europ Accumulateurs Car battery charge measuring device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2815729A1 (en) * 2000-10-24 2002-04-26 Isa France Sa Device to show status of watch batteries
WO2002035296A1 (en) * 2000-10-24 2002-05-02 Isa France S.A. Device indicating the state of batteries, designed to equip a watch
US6958954B2 (en) 2000-10-24 2005-10-25 Isa France S.A. Device indicating the state of batteries designed to equip a watch

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