JPS5836127Y2 - Electrolyte level detection device for lead-acid batteries - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a device for electrically detecting the electrolyte level of a lead-acid battery.

Conventionally, the electrolyte level detection method for lead-acid batteries has generally been integrated with the lead-acid battery, such as a prism type or a float type, rather than an electrical marking method.

With prism-type, float-type, and other electrolyte level detection methods, it is not possible to confirm electrolyte loss in locations far away from the lead-acid battery, such as in the driver's seat of a car, so a method of electrically indicating the level of the electrolyte is considered. ing.

However, since electrical ON/OFF is used to detect the liquid level, sparks may be generated at the contacts, and the mechanism to prevent hydrogen and oxygen gas generated in lead-acid batteries from igniting is complicated. It had

This invention eliminates the above-mentioned drawbacks, and utilizes the balance between the water head pressure of the electrolyte and the gas pressure generated from the liquid level detection electrode installed in the inverted U-shaped tube. This is an electrolyte level detection device for lead-acid batteries that can prevent ignition by utilizing an electrical switch action at the liquid level of the battery and a switch action below the liquid level (in the liquid).

To explain the principle diagrams in Figures 2 and 3, an inverted U
The head pressure due to the electrolyte level 2 is applied to the detection electrode side liquid level 1 in the tube 6, and the head pressure of the liquid level 4 in the detection tube is applied to the liquid level 3 communicating with the detection tube 11 in the inverted U-shaped tube 6. .

As shown in FIG. 2, when the electrolyte level 2 and the liquid level 4 in the detection tube are at the same level, the balance of water head pressure is maintained, and the gas generated from the liquid level detection electrode 5 is exhausted into the inverted U-shaped tube 6. The gas becomes gas, that is, the detection electrode generated gas 7, the gas in the inverted U-shaped tube 8, and the exhaust gas in the detection tube 9, and the liquid level 1 on the detection electrode side and the liquid level 3 communicating in the detection tube 11 in the inverted U-shaped tube 6 are constant. maintain balance.

However, as shown in Fig. 3, when the electrolyte level 2 falls, the liquid level 4 in the detection tube remains at position B, that is, the liquid adjustment limit position in the detection tube, so that The head pressure of the liquid level decreases, and the liquid level 1 on the detection electrode side is pushed down by the gas 8 in the inverted U-shaped tube, and the liquid level detection electrode 5 and the electrolyte are electrically connected at position C, that is, below the electrolyte low alarm position. It becomes an OFF state, and a low liquid alarm can be activated by an external circuit.

Furthermore, in the present invention, the OFF state of the liquid level detection electrode 5 and the liquid level 1 differs depending on the degree of decrease in the electrolyte level depending on the position of the inverted U-shaped tube 6 and the liquid level adjustment hole 10 in the detection tube. When the water head pressure inside the detection tube 11 is large, a slight decrease in the electrolyte level 2 causes the disadvantage that the detection electrode side liquid level 1 in the inverted U-shaped tube 6 is pushed down early. Malfunction can be prevented by making the diameter r2 of the detection pole side in the inverted U-shaped tube 6 smaller than the diameter r1 of the side leading into the detection tube 11, as shown in FIG. 4, so that the tension can be utilized.

In this way, basically, r1≧r2, the position of the liquid level adjustment hole 10 in the detection tube 11, and the inverted U protruding outside the detection tube 11.
By appropriately selecting the length of the protruding portion of the tube 6, it was possible to create an electrolyte level detection device for a wide range of batteries, from batteries with large liquid level fluctuation ranges to small batteries.

Generally, if the surface tension of the liquid inside the tube is γdyne, “1”5a Y″″2a, g r = tube thickness radius) h = height of rise of liquid in pipe A = liquid density g-acceleration due to gravity Therefore, if the surface tension is the same, r and h are inversely proportional.

As r becomes smaller, h becomes higher. Therefore, by setting r1≧r2 from the above, the rising height due to surface tension on the detection electrode side in the inverted U-shaped tube 6 will always be higher than that on the side of the inverted U-shaped tube 6 that communicates with the detection tube 11. Become.

Therefore, a malfunction will not occur at a liquid level higher than the electrolyte low alarm liquid level of C.

Note that 12 is a detection tube exhaust hole provided in the detection tube 11, which is a cylindrical body with a bottom, through which gas within the battery flows.

13 is a lead wire outlet, 14 is a detection pole lead wire, 15 is a liquid port plug, 16 is a liquid port exhaust hole, and 17 is a liquid port plug threaded portion.

The liquid level detection device of the present invention can be used as a detection device that does not cause false alarms when the liquid decreases in a small range (highest liquid level - lowest liquid level) such as automotive lead-acid batteries, etc., which is as small as 20 mm. possible, and electrical O in lead-acid batteries.
With N and OFF, the state of the electrolyte level can be checked at a location away from the lead-acid battery, and deterioration in the life of the lead-acid battery due to liquid loss can be prevented.

As mentioned above, the present invention can be used as a detection device that does not malfunction as an electrolyte low alarm, and can also prevent deterioration of the life of lead-acid batteries due to low electrolyte, and is also mechanically simple and inexpensive. The practical value obtained is also great.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a main part of the electrolyte level detection device for a lead-acid battery according to the present invention, and FIGS. 2, 3, and 4 are diagrams of the same principle. 5 is a liquid level detection electrode, 6 is an inverted U-shaped tube, 10 is a liquid level adjustment hole in the detection tube, 11 is a detection tube, and 12 is a detection tube exhaust hole.

Claims (1)

[Scope of utility model registration request] A detection tube consisting of a detection tube exhaust hole provided at the upper side of the bottomed cylindrical body and a liquid level adjustment hole in the detection tube provided at the lower side of the side, and one cylindrical body opening into the detection tube below the adjustment hole. an inverted U-shaped tube consisting of the other cylindrical body with an opening protruding outward below the bottom surface of the cylindrical body; and a liquid level detection electrode provided in the other cylindrical body below the opening position of the one cylindrical body. and has
An electrolyte level detection device for a lead-acid battery, characterized in that the diameter of one cylindrical body is equal to or larger than the diameter of the other.