JPS5834706Y2 - storage battery - Google Patents

Description

[Detailed description of the invention] The present invention relates to a storage battery that has a reed switch and a magnetic float, and a liquid spout that can detect the amount of electrolyte. Since contact with an electrolytic solution will cause early corrosion, this is a structure that reliably prevents the electrolytic solution from penetrating into the reed switch portion.

Conventionally, various devices have been devised to prevent the permeation of this type of electrolyte, but the most effective and representative structure among them is as shown below.

In this method, a reed switch is housed in a long and narrow protection tube that is open only at the top, and the lead wire connected to the reed switch is brought out from the open part of the protection tube, and the part of the protection tube from which the lead wire comes out is , including a part of the lead wire, into the injection mold of the cap, and by injection molding the cap, the setting part is fixed as if inserted into the cap. It is.

In this way, the strong pressure and relatively high heat during injection molding will cause the cap to tightly adhere to the protective tube and lead wire, and this adhesion will prevent the electrolyte from penetrating. It is said that

(This is generally called the double injection method,
Since it is abbreviated as the I method, it will be referred to as the I method below.
(referred to as I method).

However, in this method, the injection pressure during molding is as high as 800 to 1400 kg/cm2, which is extremely strong, so the flexible lead wire portion easily bends, so that the so-called predetermined Difficult to mold properly in position.

Furthermore, as the span of the part to be molded becomes longer, the above-mentioned curvature becomes more pronounced, so it is necessary to keep it as short as possible.

However, if the length is shortened, the length and the electrolyte permeation blocking effect will be reduced, resulting in a mutually contradictory relationship, which is not a good idea.

In addition, since the protective tube and lead wire parts must be set one by one in the cap mold, not only is the work efficiency extremely low, but it is also difficult to take out a large number of pieces, which greatly reduces productivity. As a result, prices will be forced to rise.

Furthermore, since the protective tube has a long and thin shape that is opened only in the upper part, there is a drawback that the core collapses and the mold becomes unusable at an early stage.

The present invention eliminates all of the above-mentioned drawbacks of the conventional technology, and this will be explained with reference to the drawings of one embodiment. 1 is a storage battery lid;
There is a liquid port 2 at the top, and a liquid port stopper 3 is screwed into the liquid port.

The liquid port plug 3 has a sleeve 4 on the lower side, and the sleeve is provided with a ventilation hole 5° 5', electrolyte passage holes 6, 6', and a protective tube insertion hole 7.

On the other hand, a cap 8 is fitted on the upper part at a fitting part 10 having a stopper 9, and the cap has the following features:
A gas discharge hole 11 and a lead wire insertion hole 12 penetrate therethrough.

There is a protective tube fixing part 13 below this lead wire insertion hole 12, and this part has an elongated cylindrical protective tube 14.
is fixed by a method such as screwing.

The protective tube 14 has a space 15 therein, and is open at the lower end, and a plug 17 is tightly fitted into the open part 16.

In addition, if the protective tube 14 is made of polypropylene, the material of the blocking plug 17 may be a material different from this, such as polyester resin or the like, which is effective in adhesion, such as polycarbonate, AS, or A, B, or S. It is also possible to do the same.

Further, a lead wire 18 passing through the lead wire insertion hole 12 is inserted into the protective tube 14, and a reed switch 19 is connected to the tip thereof, which is opened and closed by the action of a magnetic field.

The space 15 is filled with a filler 2 such as polyester resin.
Filled with 0.

In order to fill the filling material 20, as shown in FIG. A press-fitting nozzle 21 of a filler press-fitting device is made in the lower end open part 16 of this protective tube 14.
and press-fit the filler 20.

In addition, 22 is an electrolytic solution, 23 is a space above the liquid level, 24 is an exhaust chamber,
25 is a backing, 26 is a sleeve whose lower end 27 reaches the highest liquid level and has a slit 28, and 29 is a magnetic float that floats and sinks when the electrolyte reaches a specified specific gravity. This has magnetism inside and is loosely engaged with the protection tube 14.

This operation reduces the specific gravity value of the magnetic float 29 to 1.1, for example.
If the specific gravity of the electrolytic solution 22 is equal to or greater than the specific gravity value of 1, the magnetic float 29 will float, and if it is less than the specific gravity value, the magnetic float 29 will sink.

Depending on the floating and sinking motions, the magnetic field is applied or not applied to the node switch 19, so the reed switch 19 opens or closes, and if this is extracted as an electrical signal, the electrolyte 22 This means that the specific gravity of can be detected.

On the other hand, gas generated inside the storage battery enters the exhaust chamber 24 from the space above the liquid level 23 through the ventilation holes 5 and 5', as shown by the arrow, and is then exhausted from the gas exhaust hole 11.

This effect is that the lead wire 18 and the filler 20 have a long contact span from the end of the protective tube 14 fixed to the cap 8 to the reed switch 19, and that the reed switch 19 is inserted into the filler 20. Because of their embedded shape, they reliably prevent electrolyte penetration.

As described above, since penetration of the electrolytic solution can be reliably prevented inside the protective tube 14, there is no need for the cap 8 to be particularly kept liquid-tight.

Therefore, a lead wire insertion hole 12 large enough to allow the lead wire 18 to be inserted smoothly is provided in the cap 8 in advance, and the lead wire 18 can be inserted later, so that the lead wire can always pass through at a predetermined position. I can do it.

In addition, the filler 20 is inserted into the protective tube 14 using a filler presser.
Since the filling is forced into the opening 16, it is possible to reach every corner of the space 15, and the filling operation becomes extremely simple.

In addition, since it is not necessary to mold the cap 8 using the I method, there is no need to set the protective tube 14 and lead wire 18 one by one, and it is possible to take out a large number of pieces, which improves work efficiency. Improve yourself.

Furthermore, since both ends of the elongated protective tube 14 are open, the core of the mold can be supported at both ends, so that the core does not fall.

The plug 17 can also prevent leakage until the filler 20 solidifies, and if it is made of a material to which the filler 20 will adhere, such as A, B, S resin, etc., it will form a fluid-tight joint with the filler 20. , so that there is no penetration of electrolyte from this part.

As described above, the storage battery of the present invention has remarkable effects that eliminate all the drawbacks of the conventional ones, so its practical value is great.

[Brief explanation of the drawing]

The drawings all show one embodiment of the storage battery of the present invention, and Figure 1 shows the storage battery with a liquid port plug attached to the liquid port.
, a side view taken vertically around the liquid port stopper, and Figure 2 shows a part that has been assembled to the point where the filler can be press-fitted. FIG. 3: Liquid port plug, 8: Cap, 11: Gas discharge hole, 14:
Protection tube, 15: Space, 17: Occlusion stopper, 18. Lead wire, 19...Reed switch, 20: Filler, 2
9: Magnetic float.

Claims (2)

[Scope of utility model registration request] (1) A reed switch connected to a lead wire is housed in an elongated cylindrical protection tube, one end of the protection tube is fixed to a cap with a gas discharge hole through which the lead wire passes, and a blocking plug is provided at the other end. A storage battery comprising a liquid port plug fixedly fixed to the protection tube, a space of which is filled with a filler material, and a magnetic float is loosely connected to the protective tube. (2) The storage battery according to claim 1, wherein the plug is made of a material that adheres to the filling material.