JPS6180777A - Specific gravity sensor for lead storage battery - Google Patents

Abstract

PURPOSE:To eliminate the short life of a Pb electrode by using a liquid lead amalgam in which lead has been dissolved into mercury as a Pb electrode, and sealing it into a porous container which has such a degree that the lead amalgam does not flow out. CONSTITUTION:A container is formed by a supporter 1 consisting of acid-proof plastic, a porous active material coating 2 of a cylindrically porous plastic sheet, for example, a porous sheet of polyethylene and a bottom cover 3 of plastic, and an electrode active material 4 consisting of a liquid lead amalgam is sealed into it. A current collector 5 is an acid-proof metal wire such as platinum and tantalum etc. Such a Pb electrode has a simple structure, and the specific gravity of an electrolyte in a lead storage battery can be measured for a long time without necessitating the charging.

Description

[Detailed description of the invention] [Industrial application details] Is this complete solution to the problem of lead batteries? This relates to a specific gravity sensor that measures inverse ratio rings.

[Conventional technology]

The well-known Vc battery has a charging/discharging state, that is, a change in Lumi 3! Therefore, if we can install a specific gravity sensor that can detect the released specific gravity once per cell, it will be possible to connect it to the charger and detect the photodischarge state of the battery. It should be possible to control the power supply independently and contribute to the maintenance-free maintenance of the power supply.

Conventionally, this type of specific gravity sensor uses a tFM pair of a Pb0tWi electrode and a Pb''[mutt], and the potential difference shown by this electrode pair and the electrolytic specific gravity of dilute wax acid have an almost linear relationship. Taking advantage of this characteristic, a device called an r-electrode type specific gravity sensor is used.

[Problem that the invention seeks to solve]

However, in the rs Ka type specific gravity sensor, the IE electrode self-discharges during use, producing lead sulfate (Pb81Jt), and the sensor no longer exhibits a normal potential within a short period of time. Wait Pb
Compared to Pb (Jt) and Ni-Koshi, electric discharge has a higher self-discharge rate due to self-discharge accelerating factors such as 8b contamination.
It soon ceases to show normal potential.

In order to avoid such a situation, a method has been proposed in which the specific gravity sensor is activated by charging it to a constant value of 1g1FFJ, but this method causes polarization in the photoelectron, resulting in large measurement errors. There are 1 X points that cannot be used.

It would be convenient if there was a device that could be used for a long period of time without having to worry about charging the specific gravity sensor.

[Another way to solve the problem]

, E Pming is ratio j■-1! :/Sa% tIvi'1
lEf roPb(Ji, I'b) [lli pair Ph
With the aim of elucidating the short lifespan of Nagano, it would be sealed in a container with enough porousness to prevent it from leaking out (actual example). Iro Pb Electric I@
An example of a real demon will be explained using a drawing.

The figure shows a longitudinal cross-sectional view of Pb IC4l, where l is a support made of fff4flll plastic.

2 is a cylindrical porous plastic sheet 9 made of a porous active material such as a porous sheet made of polyethylene, 3 is a bottom lid made of plastic f-q, and 4 is made of liquid amalgam. The electrode active material 5 is a substrate, which is acid-resistant metal gravel such as platinum or tantalum.

FIG. 2 shows a comparison of changes in potential over time of a Pb battery according to the present invention and a conventional battery. While the lifespan of conventional PblI% is 1 to 1.6 years, the product of the present invention lasts for 4 years! I don't see any excitement.

The reason why the above Pb 7 prisoners were in Nagano is that the potential is higher than hydrogen ions and the hydrogen overvoltage is large, that is, the sulfuric acid 7 reacts and moves along the warm mercury. .

〔Effect of the invention〕

As stated above, γ Thus, the Pb of the battery-side specific gravity sensor of the present invention
The electrode can be simply immersed in the beak, and the electrolytic specific gravity of the battery can be measured for a long period of time without the need for charging, which greatly contributes to eliminating the need for maintenance of the battery.

[Brief explanation of the drawing]

Chopsticks [The figure shows Pbvti used in the specific gravity sensor of the present invention.
FIG. 2 is a longitudinal cross-sectional view showing one practical example of the above, and FIG. 2 is a gamma characteristic diagram comparing the lifespan of the P)+11L pole of the T-invention battery specific gravity sensor and a conventional product. 1 is a support body, 2 is a porous active material wave covering body, and 3 is a bottom cover. *1 Figure Δ 7 Figure and Drama ITI (shaved)

Claims (1)

[Claims] In a specific gravity sensor that measures the electrolyte specific gravity of a lead battery using the potential difference between PbO_2 and Pb electrodes, liquid lead amalgam is used as the electrode active material of the Pb electrode, and the porous material is made of a material that is porous to the extent that the lead amalgam does not flow out. A specific gravity sensor for lead batteries that is characterized by being wrapped.