JPS5832475B2 - Storage battery liquid level detection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a liquid level detection device for a storage battery that can electrically detect a liquid level without igniting hydrogen/oxygen gas generated within the storage battery.

Conventionally, liquid level detection devices for storage batteries have been designed to electrically display whether or not the liquid level has reached a reference position by conducting current when the electrode is in contact with the liquid surface. However, each time the liquid level comes into contact with or separates from the electrode due to fluctuations in the liquid level, sparks fly between the contacts, which generates sparks inside the storage battery and ignites the hydrogen-oxygen gas filling the battery, creating a risk of explosion. However, there are other optical methods that use prisms and mechanical methods that use floats.
All of them have the disadvantage that they are not suitable for checking the liquid level of an automobile storage battery from the driver's seat, for example.

The present invention eliminates the above-mentioned drawbacks, and includes a liquid level detection tube in the stopper body, and the liquid level detection tube has a separate chamber from the exhaust port for the gas generated in the storage battery. The inside of the liquid level detection tube is equipped with a liquid retainer that forms a deep penetration port at the bottom of the liquid level detection tube and is configured to store liquid at a level higher than the depth penetration port. A liquid level detection electrode is provided so that the lower end is located slightly higher than the liquid holder, and an electric circuit is formed between the liquid level detection electrode and the storage battery so that the polarity of the liquid level detection electrode is positive. As a result, there is no danger of ignition and explosion, and the liquid level detection device for a storage battery has a simple structure and can check the liquid level even from a distance from the storage battery.

An embodiment of the present invention will be described.

In FIGS. 1 and 2, a liquid port plug body 1 is integrally equipped with a liquid level detection tube 2, and a liquid port plug body exhaust port 3 is used to exhaust hydrogen and oxygen gas in the storage battery, and to exhaust the liquid level detection tube. The ports 4 form separate chambers to exhaust oxygen gas generated inside the liquid level detection tube 2, and a deep penetration port 5 is formed at the bottom of the liquid level detection tube 2. The liquid level detection tube 2 is provided with an overhanging liquid retainer 6 that forms a bank capable of storing the liquid at a higher level than 5, and a lower end of the liquid retainer 6 is located inside the liquid level detection tube 2 at a slightly higher level than the bank. A liquid level detection electrode 7 is provided, and its lead wire 8 is embedded in the wall of the liquid level detection tube 2 and guided upward.

In addition, 9 is a backing, and 10 is a battery case lid.

In a normal state in which the liquid level 11 in the storage battery is higher than the bank of the liquid retainer 6, the liquid level 12 in the liquid level detection tube is at the same level as the liquid level 11 in the storage battery through the depth opening 5, and the liquid level detection electrode 7 is submerged in the liquid, and a current can flow between the liquid level detection electrode 7 and the liquid.

At this time, as shown in FIG. 3, the liquid level detection electrode 7 is provided in one cell of the storage battery 130 so that its polarity is positive, and an electric circuit is formed with the storage battery 13.
No hydrogen gas is generated from the liquid level detection electrode 7, only oxygen gas is generated, which is exhausted from the liquid level detection tube exhaust port 4. On the other hand, hydrogen and oxygen gas generated within the storage battery is generated from the liquid port plug body exhaust port 3. It is exhausted and does not enter the liquid level detection tube 2 through the communication port 5 which is lower than the bank of the liquid retainer 6.

Next, in the case of an abnormal state in which the liquid level 11 in the storage battery is lower than the bank of the liquid retainer 6, the liquid level 12 in the liquid level detection tube is lower than the bank of the liquid retainer 6.
The height of the embankment that collects the liquid is the same as that of the deep penetration port 50 to prevent ventilation, and the liquid level detection electrode 7 is set to the level of the liquid level 12 in the liquid level detection tube.
, and no current can flow between the liquid level detection electrode 7 and the liquid.

In this way, when the liquid level 11 in the storage battery is normal and when it is abnormal, the liquid level detection electrode 7 and the liquid level 11 in the liquid level detection tube
It is displayed by an electrical switch between
Hydrogen and oxygen gas generated in the storage battery do not enter the liquid level detection tube 2, and only oxygen gas is generated from the liquid level detection electrode 7 in the liquid level detection tube 2, so the liquid level Even if sparks fly every time the detection electrode 7 and the liquid level 12 in the liquid level detection tube come into contact with each other, there will be no ignition and explosion.

As shown in FIG. 3, the indicator lamp 14 may be turned on when the liquid level is normal, and the indicator lamp 14' may be turned on when the liquid level is abnormal.

Note that 15°15' and 15'' are adjustment resistors for lighting the lamp.

The liquid level detection device for a storage battery according to the present invention can be embodied not only as a removable liquid spout type as described in the embodiments but also as a type that is fixed integrally to a battery case.

As described above, the present invention has no danger of ignition and explosion, can check the liquid level even from a distance from the storage battery, has a simple structure, can be manufactured at low cost, and has a low potential on the liquid level detection electrode side. Since it changes with the change in capacity of the storage battery, it has great industrial value because it can also function as a capacity meter at the same time.

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional view showing an embodiment of the liquid level detection device for a storage battery according to the present invention, FIG. 2 is a partially sectional side view, and FIG. be. 1 is a liquid port plug, 2 is a liquid level detection tube, 3 is a liquid port exhaust port,
4 is a liquid level detection pipe exhaust port, 5 is a deep penetration port, 6 is a liquid retainer,
7 is a liquid level detection electrode, 13 is a storage battery, and 14 and 14' are indicator lamps.

Claims (1)

[Claims] 1. The plug body is equipped with a liquid level detection tube, and the liquid level detection tube has an exhaust port for the gas generated in the liquid level detection tube in a separate room from the exhaust port for the gas generated in the storage battery. At the bottom of the tube, there is a liquid retainer formed to form a deep penetration port and to store liquid at a level higher than the depth penetration port. A liquid level detection device for a storage battery, in which a liquid level detection electrode is provided such that the liquid level detection electrode is located at the same position, and an electric circuit is formed between the liquid level detection electrode and the storage battery so that the polarity of the liquid level detection electrode is positive.