JPS59220023A - Storage battery monitor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a storage battery monitoring device that displays the remaining capacity 61 of a storage battery using a digital 'C' display such as an LED (light emitting diode). This article relates to a storage battery monitoring device with a display function.

When monitoring the capacity of storage batteries, the most common method is tT.
f Determine the specific gravity of the dissolved solution, and then estimate the measured ``ifi specific gravity of the dissolved solution.This method is still considered the most accurate method at present.

Conventionally, for this purpose, the electrolyte specific gravity is measured electrically, and the electrolyte specific gravity value is displayed as it is, or (J) The electrolyte specific gravity value is converted into capacity and displayed. A method has been considered that involves directly inserting the electrode into the electrolytic solution, converting the displacement of 1) to an electrical signal, amplifying it, and displaying it as the electrolytic solution specific gravity value or capacity. However, this method requires multiple steps to convert the displacement of the float into an electrical signal, and when the temperature rises, dissolved oxygen forms bubbles on the surface of the float. There are other problems, such as the need for temperature change, which makes it unsuitable for mobile storage batteries that are subject to vibrations.Also, a method that uses the refractive index of the electrolyte has been considered, but this method iA ( There are problems such as large errors due to dirt, dirt, and changes in light from the light source, and the need for an amplifier, etc., and problems such as the device itself being damaged by multiple buttons. For this reason, the storage battery monitoring device based on the above-mentioned principle is currently only being applied to a limited number of areas.

In addition, the simplified discharge v1 that compensated for the drawbacks mentioned above is
A monitoring device that detects the discharge voltage of a storage battery, smoothes the voltage, and converts the memorized value into storage battery capacity has been released in the US on November 1.
It is widely applied in -C. However, there remains a problem that this h's electric current t (discharge end stage display rapidly decreases and is not proportional to the amount of electricity (Δ1)).

The present invention solves the above-mentioned problems. ! j, a storage battery monitoring device, a circuit connected to both ends of the storage battery to obtain a voltage obtained by subtracting a constant voltage from the open circuit voltage of the storage battery, and the circuit charged with the voltage obtained by the circuit. A capacitor connected in parallel via a backflow prevention element, and a capacitor connected to the capacitor for impedance conversion and amplification of the voltage at
A level IC for point D pairing, and a plurality of LEDs connected to the outputs of the above-mentioned ED lighting level IC;
A storage battery monitoring device is provided that includes a display that displays the discharge state of the storage battery by sequentially extinguishing the plurality of LEDs in response to a voltage drop in the capacitor through a D lighting level IC.

That is, in the J3 storage battery that is discharged intermittently, such as storage batteries for electric cars and electric vehicles, the voltage at the stable peak part of the open circuit voltage (no-load voltage) when the discharge body is stopped is Considering that there is a theoretically proportional relationship with the capacity or specific gravity of the electrolyte, and that the voltage value at the peak portion also decreases as the capacity decreases or the specific gravity of the electrolyte decreases, 1) The stable peak voltage of the line voltage is stored in a capacitor, and this electric current is discharged through the internal impedance of the ED lighting level IC to convert the impedance and create a virtual discharge curve. The virtual discharge curve is displayed on a display that shows the number of LEDs lit. In addition, the voltage of a storage battery at 11 hours varies greatly depending on the magnitude of the discharge current, and it is convenient to monitor the capacity based on the voltage at this discharge, but according to the above-mentioned hypothetical discharge curve. 6 during discharge
This allows the capacity of storage batteries to be monitored. Furthermore, when the discharge body stops state again, the capacitor is charged again with the voltage at the Iζ peak portion of the stabilized open circuit voltage during the market, and the virtual discharge curve is corrected, allowing accurate monitoring. There is something like that.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The storage battery monitoring device of the present invention will be specifically described below using an embodiment shown in the drawings.

In the figure, 1 is Ill! ! Monitoring storage battery (hereinafter simply referred to as storage battery), 2 is a load, 3 is a load switching switch. 4 is the open circuit voltage of storage battery 1, that is, the storage battery 1 has a Ω load of 2
A second circuit is connected to both ends of the storage battery 1, which generates a voltage obtained by subtracting a constant voltage from the storage battery voltage when the storage battery 1 is not connected. The circuit 4 can have a variety of circuit configurations, but for example, an M4 is formed by a series circuit of a voltage regulator diode and a resistor, a constant voltage is subtracted by the voltage regulator diode, and the remaining voltage is applied 1q from both ends of the resistor. (74)

In addition, the circuit 4 is divided by 39, for example, the storage battery 1 is divided by 24
When using a rel battery, the change in the open circuit voltage of this storage battery in actual use is as small as about 51V to 47V, and the range of this voltage change will be described later. This is because the input range allows the display consisting of a plurality of LEDs to move at full scale. 5 is a capacitor charged with the voltage obtained in circuit 4, and the capacitor (
) is connected in parallel to the circuit 4 via a backflow prevention element 6 such as a silicon diode. Therefore, the capacitor 5 is charged with the stable peak voltage remaining after subtracting a constant voltage from the open circuit voltage of the storage battery 1, which is generated in the circuit 4. Even if the voltage obtained in 4 is lower than the voltage at the time of charging the battery 1, the capacitor 5 is charged!, : the battery is not discharged to the circuit 4 side. 7 is connected to the terminal of the storage battery 1 for regenerative braking or This is a capacitor that absorbs the pulse voltage when a high pulse voltage occurs during no-load voltage J, such as during chopper control.

8 is an LED lighting level IC for impedance conversion and amplification of the voltage of content 4 and 5.
The input bin of C is connected in parallel to capacitor 5.

Reference numeral 9 denotes a display unit consisting of a plurality of LIE Ds connected to the output of the lighting IC 8.

The input impedance of the LED lighting level I08 is very high, and the plurality of 1. , E D are stippled sequentially, and this L
The number of lit ED indicates the open circuit voltage of the capacitor, and therefore the storage battery. As long as there is no leakage voltage, the voltage across the capacitor 5 indicates the no-load voltage before the storage battery 1 is discharged; however, since there is a leakage current within the capacitor, the capacitor 5 gradually discharges, albeit very slightly. As a result, the voltage across the capacitor gradually decreases. This capacitor 5 will have a hypothetical discharge curve. Also capacitor 5
Since the degree of voltage drop can be arbitrarily adjusted by changing the capacitance of the capacitor 5, etc., the virtual discharge curve can also be arbitrarily selected. Furthermore, the voltage drop of Contin 1-5 is L [
It is displayed by sequentially extinguishing a plurality of LEDs of the display section 9 through the ED lighting level IC8 in response to the voltage drop of the capacitor 5.

Therefore, by looking at the number of lit LEDs on the display section 9, the voltage of the capacitor 5 and, in turn, the open circuit voltage of the storage battery 1 can be known. Roughly speaking, the loss voltage generated in the capacitor 5 is corrected by being charged again the next time the storage battery 1 stops discharging, using the open circuit voltage at this time. Therefore, the voltage of the capacitor 5 is always close to the a-line voltage of the storage battery 1. Note that the open circuit voltage of the storage battery 1 is E=0,
As expressed by the approximate formula 84→-8G (electrolyte specific gravity value), there is a proportional relationship with the electrolyte specific gravity value and the volume and weight, and detecting the voltage of the capacitor 5 is based on the capacity of the storage battery 1 or the electrolyte specific gravity. The value will be detected.

In addition, 10 is a constant voltage diode designed to expand the input terminal of the level 108 for LED lighting, and 11 is a constant voltage diode for the LE.
Constant voltage diode 1 and r for establishing the power supply of D lighting level IC8 are current limiting resistors.

As described above, in this embodiment, the open circuit voltage of the storage battery 1 is stored in the capacitor 5, and the voltage of the capacitor 5 is impedance-converted by avoiding discharge through the internal impedance of the LIE D lighting level IC 8. A virtual discharge curve is created, and each time point of this virtual discharge curve is displayed by the number of lights of a plurality of FDs on the display section 9. Therefore, when connecting this device to the storage battery 1, the molding state of the storage battery 1 can be displayed using the L button on the display section 9.
It is possible to know the number of lights of E I) in °C.

that's all)! In order to monitor the storage battery of the present invention, it is possible to monitor the storage battery without inserting a sensor to measure the specific gravity into the storage battery as in the conventional case. You can accurately monitor the capacity and electrolyte specific gravity of the C-storage battery by simply connecting it to the storage battery terminal, even while the storage battery is being left unused or discharging. It has the excellent advantage that it can be easily distinguished because it is displayed by the number of lit dots.

[Brief explanation of the drawing]

The figure is a circuit diagram showing an embodiment of the storage battery monitoring device of the present invention.

Claims (1)

[Claims] #? A circuit connected to both ends of the storage battery to obtain a voltage obtained by subtracting a constant voltage from the main battery power line 1F, and a circuit connected to the circuit charged with the voltage obtained by subtracting 1 from the circuit, are connected in parallel via a backflow prevention element. a capacitor connected to the capacitor V-E connected to the capacitor for impedance conversion and amplification of the voltage of the above-mentioned 1., 1), and a level IC for lighting; One of the plurality of LEs is sequentially turned on in response to a voltage drop in the condenser through the [-E] lighting level IC, which is made up of a plurality of LEs connected to the output of the lighting level IC. Ura-Rikotoyotsu-UW+ A storage battery monitoring device equipped with a display device that displays the discharge status of a battery.