JPS5844978B2 - Lead-acid battery electrolyte specific gravity measuring device - Google Patents

Description

Detailed Description of the Invention The present invention uses the lead-acid battery to be measured as a power source by immersing a small set of measurement electrodes whose potential changes in proportion to the specific gravity of the electrolyte of the lead-acid battery into the electrolyte of the lead-acid battery. This invention relates to a lead-acid battery electrolyte specific gravity measuring device which displays on a display device the potential difference between the DC potential obtained using a Zener diode and other components via an insulated DC-DC converter and the measurement electrode set. be.

As a conventional seed lead-acid battery electrolyte specific gravity measurement device, the potential of a lead dioxide electrode, that is, a detection electrode, is immersed in a lead-acid battery electrolyte, and a lead dioxide electrode, a mercurous sulfate electrode, or a calomel electrode is immersed in a standard specific gravity electrolyte. There have been devices that detect the specific gravity of the electrolyte in lead-acid batteries by measuring the potential difference between the potential of a standard electrode such as an electrode, etc.; To construct a circuit, it is necessary to provide a liquid junction between the lead-acid battery electrolyte and the standard electrode electrolyte, and when used for many years, mixing of both electrolytes occurs through the liquid junction, causing the standard electrode's electrolyte to deteriorate. Phenomena such as evaporation and deterioration of the electrolyte of the standard electrode are unavoidable during many years of use.
The storage battery described in Japanese Patent Publication No. 40-22820 has disadvantages such as the need to replace the electrolyte of the standard electrode and replace the standard electrode itself every year. Although there is a charging/discharging state determination device, this device has a drawback that the reference battery changes over time and therefore no longer fulfills its role during long-term use.

The present invention aims to eliminate the above-mentioned drawbacks, and its purpose is to use the lead-acid battery to be measured as a power source and to insulate the lead-acid battery to be measured from the electrode set for measurement through a DC-DC converter. The standard potential is Zener
Because it uses a stable potential using diodes, etc., and has a maintenance charging circuit for the measurement electrode assembly, there is no need for liquid junctions or electrolytes used in standard electrodes, and it It is an object of the present invention to provide a device that exhibits stable measurement accuracy over a long period of time without any change over time.

To explain this about the drawings, 1 is a battery case, 2 is a battery case lid, 3 is a group of electrode plates, 4 is an electrolytic solution made of dilute sulfuric acid, and 5 is a measurement in which the potential changes in proportion to the specific gravity in dilute sulfuric acid. A set of electrodes, for example, a set of electrodes consisting of a lead dioxide electrode and a lead electrode, 6 is a DC-DC converter that operates using the lead-acid battery cell or storage battery group to be measured as a power source, and its input and output sides are insulated. use

7 is a resistor, 8 is a zener diode, 9 and 10 are resistors, 11 is a display device, such as a voltmeter scale plate with a specific gravity scale engraved thereon, and 12 is a self-container of the electrode assembly 5 for measurement. This is a maintenance charging resistor provided to compensate for discharge.

Further, VS is a standard potential obtained from a combination of a DC converter 6, a Zener diode 8, and a resistor 9. 8 is an electrode potential obtained from the measurement electrode set 5.

Since the present invention has the above-described structure, the stable potential obtained across the Zener diode 80 is divided by the resistors 9 and 10, and the required standard potential Vs is taken out from both ends of the resistor 90.
Electrode potential ■ obtained from the measurement electrode set 5 according to this and the specific gravity of the electrolytic solution 4.

The difference in potential obtained by comparing the
- By looking at the display device 11 activated by V8, by the position of the pointer that indicates the electrolyte specific gravity value engraved on the scale plate of the display device 11, based on the previously measured potential difference ■8-■3 vs. electrolyte specific gravity characteristic. , the electrolyte specific gravity value of lead-acid batteries can be detected accurately.

Note that the Zener diode 8 portion where the standard potential ■8 is obtained in the drawing is just an example, and it is possible to use a plurality of Zener diodes 8 or one that includes temperature change correction. 11 can be used as a meter, a controller including an amplifier, or the like.

As mentioned above, in the present invention, the standard potential generating section does not change over time unlike conventional reference batteries, has a simple structure, can always obtain a stable standard potential, has a semi-permanent life, and has a large capacity measuring electrode. Since the lead-acid battery to be measured is maintained and charged via a DC-DC converter, there is no deterioration and therefore no maintenance is required.In particular, this lead-acid battery can be used for a long period of time in order to exhibit stable measurement accuracy over a long period of time. It is of great industrial value as it can fully demonstrate its effectiveness as an electrolyte specific gravity measuring device.

[Brief explanation of drawings]

The drawing is a schematic diagram of a lead-acid battery equipped with a lead-acid battery electrolyte specific gravity measuring device of the present invention. 4 is an electrolytic solution, 5 is a set of measurement electrodes, 6 is a DC-DC converter, 8 is a Zener diode, 9 and 10 are resistors, 11 is a display device, (1) 8 is a standard potential, and (3) is an electrode potential.

Claims (1)

[Claims] 1. In a lead-acid battery electrolyte specific gravity measuring device, the electrode potential obtained by installing a set of measurement electrodes whose potential changes in proportion to the specific gravity in the electrolyte of a lead-acid battery, and the power source of the lead-acid battery cell or group of batteries to be measured. A lead-acid battery in which a display device displays the potential difference between a constant potential stabilized by a Zener diode through an insulated DC-DC converter and a standard potential obtained by dividing the voltage by resistors to match the electrode voltage. Electrolyte specific gravity measuring device.