Arrangement for monitoring batteries
First Claim
1. An arrangement for monitoring batteries, particularly for ascertaining the remaining capacity of batteries for electrical vehicles, comprising, in combination, two battery-connection terminals for connection to a battery;
- electrical metering means having electrical input means for receipt of an electrical signal to be metered;
load resistor means;
connecting means for connecting said electrical input means in circuit with said battery-connection terminals, and including timing switch means operative when activated for connecting said load resistor means in circuit with said battery-connection terminals for a time interval to cause a definite discharge current to be drawn by said load resistor means from said battery connection terminals for said time interval, said timing switch means including temperature-responsive switch means responding to the heat generated by said load resistor means for terminating said time interval; and
arresting means automatically operative at the end of said time interval for arresting the operation of said metering means and causing said metering means to persistently hold the value most recently metered by said metering means, this held metered value then serving as an indication of the remaining capacity of the battery.
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Abstract
A battery-condition monitoring operation is performed by connecting a load resistor across the battery terminals for a time interval to draw a definite battery discharge current. A metering unit measures the voltage across the load resistor or that directly across the terminals of the battery. A timing switch sensible to the temperature of the load resistor automatically terminates the time interval, and a start switch is pressed to initiate the time interval; alternatively, the timing switch automatically initiates the measurement at successive time intervals. Latest at the end of the time interval, an arresting device prevents the metering unit from responding further to the metered signal, and the value most recently metered by the metering unit is persistently held, until the next such measurement operation, and constitutes an indication of the remaining capacity of the battery.
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Citations
14 Claims
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1. An arrangement for monitoring batteries, particularly for ascertaining the remaining capacity of batteries for electrical vehicles, comprising, in combination, two battery-connection terminals for connection to a battery;
- electrical metering means having electrical input means for receipt of an electrical signal to be metered;
load resistor means;
connecting means for connecting said electrical input means in circuit with said battery-connection terminals, and including timing switch means operative when activated for connecting said load resistor means in circuit with said battery-connection terminals for a time interval to cause a definite discharge current to be drawn by said load resistor means from said battery connection terminals for said time interval, said timing switch means including temperature-responsive switch means responding to the heat generated by said load resistor means for terminating said time interval; and
arresting means automatically operative at the end of said time interval for arresting the operation of said metering means and causing said metering means to persistently hold the value most recently metered by said metering means, this held metered value then serving as an indication of the remaining capacity of the battery. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 11)
- electrical metering means having electrical input means for receipt of an electrical signal to be metered;
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10. An arrangement for monitoring batteries, particularly for ascertaining the remaining capacity of batteries for electrical vehicles, comprising, in combination, two battery-connection terminals for connection to a battery;
- electrical metering means having electrical input means for receipt of an electrical signal to be metered;
load resistor means;
connecting means for connecting said electrical input means in circuit with said battery-connection terminals, and including timing switch means operative when activated for connecting said load resistor means in circuit with said battery-connection terminals for a predetermined time interval to cause a definite discharge current to be drawn by said load resistor means from said battery-connection terminals for said time interval;
arresting means operative latest at the end of said time interval for arresting the operation of said metering means and causing said metering means to persistently hold the value most recently metered by said metering means, this held metered value then serving as an indication of the remaining capacity of the battery;
said metering means being electromechanical and said arresting means comprising an electromagnetic brake operative for mechanically arresting said electromechanical metering means; and
said electromechanical metering means being rotary and including a rotary shaft carrying a brake disk, said electromagnetic brake comprising an electromagnet having a coil and an armature and biasing means normally urging said armature to press against said brake disk and in that way arrest said metering means, said electromagnet when energized causing said armature to cease pressing against said brake disk. - View Dependent Claims (12, 13, 14)
- electrical metering means having electrical input means for receipt of an electrical signal to be metered;
Specification