JPH10261433A - Cap for forming battery jar of sealed lead-acid battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make each small bubble burst for elimination in an outward directed surface of a porous material by passing the bubbles, which are generated in an electrolyte recovering and gas discharging passage, into multiple through holes of a bubble eliminating porous material provided inside of a cylinder part. SOLUTION: A cap 1 for forming battery jar of sealed lead-acid battery is provided with an insertion cylinder part 3 having a small diameter under a main cylinder part 2, and an electrolyte recovering and gas discharging passage 4 is formed in these cylinder parts 2, 3. A bubble eliminating material 5 provided inside of the cylinder part 2 so as to cross the gas discharging passage 4 is formed by providing a plate body 5a with multiple through holes 5b having a diameter at 1-2 mm, and bubbles of SiO2 generated in the electrolyte recovering and gas discharging passage 4 is changed to small bubbles through these multiple through holes 5b of the bubble eliminating porous material 5, and thereafter, the small bubbles are suddenly discharged to a large space in an outward directed surface of the bubble eliminating porous material 5 so as to make each bubble burst for elimination. With this structure, bubbles of the electrolyte is not eliminated and pushed by the inner pressure, and as a result, leak of the electrolyte is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cap for forming a sealed lead-acid battery in a battery case.

[0002]

2. Description of the Related Art Conventionally, the formation of a sealed lead-acid battery in a battery case has been performed by inserting a cap 1 for forming a sealed lead-acid battery case into a valve cylinder of a safety valve as shown in FIG. The sealed lead-acid battery battery forming cap 1 is provided with a small-diameter insertion tube portion 3 for insertion into a valve cylinder of a sealed lead-acid battery on a flat bottom portion 2a below the main tube portion 2. In this structure, a passage 4 for collecting and discharging the electrolyte was provided.

[0003] When the battery case is formed by inserting the insertion tube portion 3 of the sealed lead storage battery battery forming cap 1 into the valve lead of the sealed lead storage battery, the liquid temperature rises during the formation of the battery case. Even if the electrolytic solution rises in the valve cylinder and rises inside the valve cylinder, it is kept in the sealed lead-acid battery battery case forming cap 1 without flowing out to the outside, and the liquid level in the battery case drops after the formation is completed. At this point, the gas can be returned into the battery case, and the gas at the time of forming the battery case can be released to the outside through the sealed lead storage battery battery case forming cap 1.

[0004]

However, in the conventional sealed lead-acid battery battery case forming cap 1 having the structure shown in FIG. 3, the electrolytic solution pushed up by the gas generated during the battery case formation recovers the electrolytic solution. The gas accumulates in the degassing passage 4 in a state of being separated by a gas, is not used for a chemical conversion reaction, and has a problem that the battery varies.

[0005] When a gel such as SiO ₂ is added to the electrolyte, a large number of small bubbles of the electrolyte are generated at the outlet of the small hole of the insertion tube 3 opening at the flat bottom 2 a of the main tube 2. There is a problem that these bubbles are likely to be formed, and these bubbles are pushed up by the internal pressure without being eliminated in the passage 4 for electrolyte recovery and degassing, and as a result, the electrolyte overflows outside.

Further, in the conventional structure, the lower portion of the main cylinder portion 2 is a flat bottom portion 2a. Therefore, when the electrolytic solution which has risen into the main cylinder portion 2 is collected in the battery case, the flat bottom portion 2a is used. There was a problem that the electrolyte solution easily remained on 2a.

An object of the present invention is to provide a cap for forming a sealed lead-acid battery container, which can easily eliminate bubbles in a passage for collecting and degassing an electrolyte.

[0008] Another object of the present invention is to provide a cap for forming a sealed lead-acid battery battery case, in which a defoaming porous body can be easily provided.

Another object of the present invention is to provide a cap for forming a sealed lead-acid battery battery case provided with a defoaming porous body having a through hole having a good defoaming effect.

Another object of the present invention is to provide a cap for forming a sealed lead-acid battery battery case, which has a good defoaming effect and can reliably recover an electrolytic solution.

[0011]

SUMMARY OF THE INVENTION A cap for forming a sealed lead-acid battery case to be improved by the present invention has a small-diameter insertion tube portion for insertion into a valve cylinder of the sealed lead-acid battery below the main tube portion. And a structure in which a passage for electrolyte recovery and degassing is formed in these cylindrical portions.

[0012] In the present invention, the bubble elimination porous body having a large number of through holes is provided across the inside of the cylindrical portion. With such a structure, the bubbles due to SiO ₂ generated in the passage for collecting and degassing the electrolytic solution are made into small bubbles by passing through a large number of through holes of the bubble elimination porous body. By suddenly putting out a large space on the facing side, each bubble can be popped and erased. Therefore, it is possible to eliminate the problem that the foam of the electrolytic solution is pushed up by the internal pressure without being eliminated in the passage for collecting and venting the electrolytic solution, and as a result, the electrolytic solution overflows outside.

In this case, it is preferable that the porous foam body has a structure in which a large number of through holes are formed in a plate-like body. This makes it possible to easily form the defoamed porous body by molding.

The diameter of each through-hole of the bubble elimination porous body is 1 to
Preferably the size is in the range of 2 mm. If the diameter of the through-hole of the defoaming porous body is smaller than 1 mm, gel will
If it is larger than mm, sufficient effect on defoaming cannot be obtained.

It is preferable that a tapered tube having a funnel-shaped inner surface is provided between the main tube and the insertion tube. In this case, the bubbles of the electrolytic solution can be increased by the guiding action of the funnel-shaped inner surface of the tapered cylindrical portion, so that the electrolytic solution can be easily popped. Further, the electrolytic solution can be easily returned into the battery case by using the funnel-shaped inner surface of the tapered cylindrical portion.

[0016]

FIG. 1 shows a first example of an embodiment of a cap for forming a sealed lead storage battery container according to the present invention.

This sealed lead storage battery battery case formation cap 1
Is provided with a small-diameter insertion cylinder portion 3 for insertion into a valve cylinder of a sealed lead-acid battery below a main cylinder portion 2 having a constant inner diameter, and a passage for electrolyte recovery and degassing in these cylinder portions 2 and 3. 4 are formed. The tip of the insertion tube 3 is cut diagonally. A bubble elimination porous body 5 is provided in the cylindrical portion 2 across the electrolyte recovery and degassing passage 4. The bubble elimination porous body 5 has a structure in which a large number of through holes 5b are formed in a plate-like body 5a. In this example, the inner diameter d of the main cylinder 2 is 2.
5 cm, the dimension from the lower end of the main cylindrical portion 2 to the lower surface of the bubble elimination porous body 5 is 6 cm, the thickness of the plate 5a is 1 cm, and the dimension from the upper surface of the plate 5a to the upper end of the main cylindrical portion 2 is 5 cm. The diameter of the through hole 5b of the plate member 5a is 1 to 2 mm. Such a cap 1 for forming a sealed lead-acid battery battery case is formed by integral molding of acid-resistant polyvinyl chloride.

When a bubble elimination porous body 5 is provided in the cylindrical portion 2 of the sealed lead storage battery battery forming cap 1, bubbles due to SiO ₂ generated in the passage 4 for electrolyte recovery and degassing are removed by the bubble elimination porous body. The small bubbles are passed through a large number of through-holes 5b, and then suddenly put into a large space on the outward facing side of the bubble elimination porous body 5, whereby each bubble can be repelled and eliminated. Therefore, it is possible to eliminate the problem that the foam of the electrolyte is pushed up by the internal pressure without being eliminated in the passage 4 for electrolyte recovery and degassing, and as a result, the electrolyte overflows outside. A large number of through holes 5b are formed in the plate-like body 5a as shown in FIG.
With the hollow structure, the bubble elimination porous body 5 can be formed together with the cylindrical part 2 and the like at the time of molding.

FIG. 2 shows a second example of an embodiment of a cap for forming a sealed lead storage battery battery case according to the present invention.

This sealed lead storage battery battery case forming cap 1
Then, a funnel-shaped inner surface 6 is provided between the main cylindrical portion 2 and the insertion cylindrical portion 3.
a is provided. Other configurations are the same as those in FIG.

As described above, when the tapered cylindrical portion 6 having the funnel-shaped inner surface 6a is provided between the main cylindrical portion 2 and the insertion cylindrical portion 3, bubbles formed by SiO ₂ generated at the time of forming the battery case can be removed. By the guiding action of the funnel-shaped inner surface 6a of the above, it is possible to increase the size and make it easier to repel. Further, the electrolytic solution can be easily returned into the battery case by using the funnel-shaped inner surface 6a of the tapered cylindrical portion 6. Other effects are similar to those of the first example.

Inserting the sealed lead-acid battery battery case forming cap 1 having the structure shown in FIG. 1 into the valve cylinder of the safety valve of the sealed lead-acid battery to form the battery case, and confirming whether or not the electrolyte overflows and the bubble overflows. Done. For comparison, a sealed lead-acid battery with the safety valve opened and a sealed lead-acid battery with the conventional sealed lead-acid battery battery forming cap 1 shown in FIG. Done. Note that 1.5 we% of SiO ₂ was added to the electrolyte of each sealed lead storage battery.

As a result, in the sealed lead-acid battery having the safety valve opened, the electrolyte overflowed during the formation of the battery case.
Conventional cap 1 for forming a sealed lead storage battery battery case shown in FIG.
In a sealed lead-acid battery with
Bubbles caused by ₂ overflowed to the outside of the main cylinder 2 without disappearing. On the other hand, in the case of using the sealed lead-acid battery battery forming cap 1 of the present invention shown in FIG. 1 of the present invention, there is no overflow of the electrolyte and no overflow of the bubbles, Best without any separation by gas. The diameter of the through-hole 5b of the bubble elimination porous body 5 is 1 mm.
If it was smaller than the gel, the gel was lost. In this example, the material of the cap 1 was polyvinyl chloride. However, similar results were obtained with synthetic resins such as acrylic and ABS. The sealed lead-acid battery manufactured this time is a 12V-38Ah battery with a space volume of approximately 200 ml after injecting the electrolyte.
At 8.4 A, the formation time was 35 hours.

The bubble elimination porous body 5 is not limited to the one described above, but may be a structure in which a number of thin acid-resistant synthetic resin tubes or the like are bundled in close contact with each other.

[0025]

In the cap for forming a sealed lead-acid battery container according to the present invention, a bubble elimination porous body is provided in the cylindrical portion, so that bubbles generated in the passage for electrolyte recovery and degassing are removed from the bubble elimination porous body. After passing through a large number of through-holes to form small bubbles, the bubbles are suddenly discharged into a large space on the outward facing side of the foam eliminating porous body, whereby each bubble can be repelled and eliminated. Therefore, it is possible to eliminate the problem that the foam of the electrolytic solution is pushed up by the internal pressure without being eliminated in the passage for collecting and venting the electrolytic solution, and as a result, the electrolytic solution overflows outside. For this reason, variations in the electrical performance of the sealed lead storage battery can be eliminated.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a first example of an embodiment of a cap for forming a sealed lead storage battery container according to the present invention.

FIG. 2 is a perspective view of a second example of the embodiment of the cap for forming a sealed lead storage battery container according to the present invention.

FIG. 3 is a perspective view of a conventional cap for forming a sealed lead storage battery battery case.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cap for forming a lead storage battery battery case 2 Main cylinder part 2a Flat bottom part 3 Insertion cylinder part 4 Electrolyte recovery and degassing passage 5 Defoaming porous body 5a Plate 5b Through hole 6 Tapered cylinder 6a Funnel-shaped inner surface

Claims (4)

[Claims] 1. A sealed lead-acid battery having a small-diameter insertion tubular portion for insertion into a valve cylinder of a sealed lead-acid battery below a main tubular portion, and a passage for electrolyte recovery and degassing formed in these tubular portions. A cap for forming a sealed lead-acid battery, wherein a foam eradicating body having a large number of through holes is provided across the inside of the cylindrical portion. 2. The cap for forming a sealed lead-acid battery battery container according to claim 1, wherein the bubble elimination porous body has a structure in which a large number of through holes are formed in a plate-like body. 3. The diameter of each through-hole of the bubble elimination porous body is 1
The cap for forming a sealed lead-acid battery battery container according to claim 1 or 2, wherein the cap is set to a size in a range of up to 2 mm. 4. The sealed lead storage battery according to claim 1, wherein a tapered cylindrical portion having a funnel-shaped inner surface is provided between the main cylindrical portion and the insertion cylindrical portion. Battery case formation cap.