JP2003132869A - Control valve type lead storage battery and exhaust cap for storage battery and control valve type lead storage battery using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a low cost and high reliable control valve type lead storage battery in which the radius of an explosion-proof filter is decreased to suppress the explosion-proof filter to be clogged in the safety valve structure of the control valve type lead storage battery. SOLUTION: The control valve type lead storage battery has a cap type safety valve 2 mounted on the cylindrical exhaust cylinder 3 provided on the outer package of the battery. A cylinder 5 is so provided as the end of the cylinder on the top panel 2a of the safety valve 2. An explosion-proof filter 6 is provided in the inside of the cylinder 5. The outer radius size R6 of the explosion-proof filter is not larger than that of R2 of the safety valve 2. A counter face 6a facing to the safety valve 2 of the explosion-proof filter 6 is placed in the inside of the cylinder 5 having at least a space 7 from the end of the cylinder 5a. A cut portion 5b is formed in the space 7 for communicating the inside and outside of the cylinder 5 as a pathway.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the structure of a safety valve having an explosion-proof filter, particularly in a valve-regulated lead-acid battery.

[0002]

2. Description of the Related Art Control valve type lead-acid batteries have been in increasing demand as an emergency power source for information and communication systems, and have improved reliability, safety,
Low cost is required. This control valve type lead-acid battery is always trickle charged in case of commercial power failure.
During this trickle charging, oxygen gas is generated from the positive electrode of the control valve type lead storage battery, but this oxygen gas is absorbed by the negative electrode and the oxygen gas is not exhausted outside the battery.

However, due to variations and fluctuations in charging voltage, hydrogen gas may accumulate in the battery along with oxygen gas. Accumulation of these gases may cause the battery internal pressure to rise, which may cause the battery to deform or be damaged.To avoid this, the control valve type lead-acid battery has the battery internal pressure raised to a predetermined value. In some cases, a safety valve is provided to discharge the gas inside the battery to the outside of the battery.

Although oxygen gas and hydrogen gas discharged from the safety valve are dissipated in the atmosphere, when a control valve type lead storage battery is used as an emergency power source, a large number of batteries are connected in series and installed in a relatively narrow space. It is often done. In this state, if a spark is generated for some reason due to static electricity in the battery installation space, the oxygen gas and hydrogen gas remaining near the safety valve ignite, and the flame caused by the ignition opens. Gas that has passed through the safety valve and accumulated in the battery may catch fire. Therefore,
In order to suppress the ignition of the gas accumulated in the battery, a valve regulated lead-acid battery having a safety valve portion provided with an explosion-proof filter has been proposed.

A structure shown in FIG. 5 is known as a control valve type lead-acid battery provided with such an explosion-proof filter. A cap-shaped safety valve 52 provided on a lid 51 for closing an opening of a battery case (not shown) in which an electrode plate group (not shown) is inserted.
It has an exhaust tube portion 53 to which is attached. On the top surface of the safety valve 52, an upper lid 54 is attached to the lid 51 to prevent the safety valve 52 from falling off the exhaust tube portion 53. The explosion-proof filter 55 is provided in the upper lid 54, and the safety valve 52 is provided.
A vent 56a for venting the gas discharged from the explosion-proof filter 55 and a vent 56b for venting the gas passing through the explosion-proof filter 55 to the outside of the battery are provided.

In such a safety valve structure, when gas is generated from the inside of the control valve type lead storage battery and the safety valve 52 is actuated to open, the safety valve 52 is opened by the gas in the battery.
4, the gas is discharged to the outside through the path 57 formed between the safety valve 52 and the exhaust tube portion 53. Therefore, the vent 56a needs to be provided at least at a position outside the diameter of the safety valve 52 (the size indicated by R52 in FIG. 5), and the outer diameter of the explosion-proof filter 55 (depending on the position of the vent 56a ( The dimension indicated by R55 in FIG. 5) is made larger than the dimension R52 which is the diameter of the safety valve 52.

[0007]

In the conventional structure as described above, it is necessary to make the diameter of the explosion-proof filter 55 considerably large. Further, the explosion-proof filter 55 is provided inside the upper lid 54.
The price of the battery was high because of the complicated structure in which was inserted.

The present invention solves these problems and provides a control valve type lead storage battery which is excellent in reliability and has a simple structure and is inexpensive.

[0009]

In order to solve the above-mentioned problems, the invention according to claim 1 of the present invention is a control valve type lead-acid battery in which a safety valve body is attached to an exhaust port provided in a battery exterior. A concave portion is provided at a position corresponding to the safety valve body in the upper lid that covers the top surface of the safety valve body, and an explosion-proof filter is provided in the concave portion, and the outer diameter dimension of the explosion-proof filter is at least the outer diameter dimension of the safety valve body or less. The facing surface of the explosion-proof filter facing the safety valve body is located inside the recess at least with an interval from the outer edge of the recess, and when the safety valve body is opened, the battery inner space and the explosion-proof filter are formed. The control valve type lead storage battery is characterized in that a ventilation path between the two is formed on the outer edge of the recess.

The invention according to claim 2 of the present invention is a control valve lead-acid battery in which a safety valve body is attached to an exhaust port provided in a battery exterior, the tip of which faces the top surface of the safety valve body. An explosion-proof filter is provided inside the tubular part, the outer diameter dimension of the explosion-proof filter is equal to or less than the outer diameter dimension of the safety valve body, and the facing surface of the explosion-proof filter facing the safety valve body is at least the cylinder. A control valve type characterized in that it is located inside the tubular portion with a space from the tip of the portion, and that a passage that connects the inside and outside of the tubular portion is formed within the space between the explosion-proof filter and the tubular portion. It shows a lead acid battery.

Further, the invention according to claim 3 of the present invention is the control valve type lead storage battery having the structure according to claim 2, wherein the exhaust port is provided at the bottom of the space provided in the battery exterior, This shows that the upper lid provided so as to cover the space portion is provided with the cylindrical portion, and the upper lid is provided with a path for discharging the gas discharged from the explosion-proof filter to the outside of the battery.

The invention according to claim 4 of the present invention is an exhaust plug equipped with a safety valve which is mounted on the exterior of a battery and opens and closes at a predetermined internal battery pressure, the exhaust plug connecting the inside and outside of the battery. A safety valve is attached to the exhaust port, a recess is provided at a position corresponding to the safety valve of the cover that covers the top surface of the safety valve, and an explosion-proof filter is provided in the recess. The dimension is equal to or less than the outer diameter of the safety valve body, and the facing surface of the explosion-proof filter facing the safety valve body is located inside the recessed portion at least with an interval from the outer edge of the recessed portion, and when the safety valve body is opened. 1 shows an exhaust plug for a storage battery, in which a ventilation path between a battery internal space and the explosion-proof filter is formed at an outer edge of the recess.

Further, the invention according to claim 5 of the present invention is an exhaust plug equipped with a battery exterior and equipped with a safety valve for opening and closing the battery internal pressure at a predetermined value, the exhaust plug connecting the inside and outside of the battery. An exhaust plug having a safety valve at the exhaust port, wherein the exhaust plug is configured by attaching a safety valve body to the exhaust port that communicates the inside and outside of the battery, and a tip end of the safety valve body has a cylindrical portion facing the top surface. Provided with an explosion-proof filter in the tubular portion, the outer diameter of the explosion-proof filter is less than or equal to the outer diameter of the safety valve body,
The facing surface of the explosion-proof filter facing the safety valve body is located at least inside the tubular portion with a space from the tip of the tubular portion, and the tubular portion of the tubular portion is located within the space between the explosion-proof filter and the tubular portion. 1 shows an exhaust plug for a storage battery, which is characterized in that a passage connecting the inside and the outside is formed.

According to a sixth aspect of the present invention, in the exhaust valve for a storage battery having the configuration according to the fourth or fifth aspect, a part or a recess of the tip of the tubular portion is used as a gas exhaust passage. It is characterized in that a notch is provided on the outer edge of.

The invention according to claim 7 of the present invention shows a control valve type lead storage battery in which an exhaust plug for a storage battery having the structure according to any one of claims 4 to 6 is attached to a battery exterior. Is.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION (First Embodiment) A main part of a control valve type lead storage battery according to a first embodiment of the present invention will be described with reference to the drawings.

The control valve type lead-acid battery according to the first embodiment of the present invention closes an opening of a battery case (not shown) in which an electrode plate group (not shown) is inserted as shown in FIG. On the bottom surface of the space portion 1a provided in the lid 1 for this purpose, there is an exhaust tube portion 3 which functions as an exhaust port in which a cap-shaped safety valve 2 as a safety valve body is mounted. On the top surface 2a of the safety valve 2, an upper lid 4 is attached to the lid 1 so as to cover the top surface 2a of the safety valve 2 in order to prevent the safety valve 2 from falling off from the exhaust tube portion 3.

In the present invention, the cylinder portion 5 is provided on the safety valve side (battery inside) surface of the upper lid 4, and the cylinder portion tip 5a is positioned so as to face the top surface 2a of the safety valve 2. And
An explosion-proof filter 6 is attached to the tubular portion 5. The explosion-proof filter 6 may be a porous body formed by sintering alumina particles, silica particles or synthetic resin particles.

The facing surface 6a of the explosion-proof filter 6 facing the safety valve 2 is arranged inside the tube portion 5 with a space 7 from the tip 5a of the tube portion.
The outer diameter R6 of the safety valve 2 is smaller than the outer diameter R2 of the safety valve 2. Further, a cutout portion 5b is provided at the tip end 5a of the tubular portion as a ventilation path for guiding the gas discharged from the inside of the battery to the explosion-proof filter 6. Gas can be ventilated between the inside and outside of the tubular portion 5 by the notch portion 5b. It should be noted that it is possible to provide a through hole (not shown) for ventilation in place of the notch portion 5b in a space 7 near the tip 5a of the tubular portion. Further, an exhaust hole 8 is provided in the upper lid 4 in order to exhaust the exhaust gas passing through the explosion-proof filter 6 to the outside of the battery.

FIG. 2 is a view showing a state in which the safety valve of the control valve type lead storage battery shown in FIG. 1 is opened. As the internal pressure of the battery rises, the safety valve 2 comes into contact with the tip 5a of the cylinder portion provided on the upper lid 4, and the gas in the battery is discharged through the gap formed between the outer wall of the exhaust cylinder 3 and the inner wall of the safety valve 2. Arrow E in 2
It is discharged through the route shown in.

After the exhaust gas is discharged to the outside of the exhaust tube portion 3,
The explosion-proof filter 6 is introduced from the outside of the tubular portion 5 into the tubular portion 5 through the cutout portion 5b as a ventilation path provided at the tubular portion tip 5a.
And it is discharged to the outside of the battery through the exhaust hole 8.

When the safety valve 2 is opened, the top surface 2a of the safety valve 2 is opened.
The position is restricted by the tip of the tubular portion 5. At this time, the interval 7
Therefore, the top surface 2a of the safety valve 2 and the facing surface 6a of the explosion-proof filter 6 do not come into direct contact with each other. Therefore, even if the sulfuric acid mist is discharged from the exhaust tube portion 3, it is possible to prevent the explosion-proof filter 6 from being clogged with the sulfuric acid mist by preventing the sulfuric acid mist from penetrating into the explosion-proof filter 6.

Further, by providing the interval 7 and the notch 5b, a gas discharge path can be secured within the outer diameter dimension R2 of the safety valve 2. Therefore, unlike the conventional example shown in FIG. 5, it is not necessary to provide a gas discharge path outside the outer diameter of the safety valve, and as a result, the outer diameter dimension R6 of the explosion-proof filter 6 is set to the outer diameter dimension R2 of the safety valve 2 or less. It is possible to set a smaller one with a smaller diameter than that of.

As a method of fixing the explosion-proof filter 6 to the cylindrical portion 5, there is a method of fixing the both with an adhesive.
If the projection 5c for preventing the explosion-proof filter 6 from falling is provided at the tip 5a of the tubular portion and the explosion-proof filter 6 is press-fitted into the tubular portion 5 as shown in FIG. It can be fixed to the part 5.

In the first embodiment, the exhaust tube portion 3 is formed on the bottom surface of the space portion 1a provided in the lid 1.
In addition to this, it is also possible to directly project the exhaust tube portion 3 from the outer surface of the battery. However, in such a structure, the safety valve structure projects from the battery, which is disadvantageous from the viewpoint of miniaturization of the battery.

(Second Embodiment) FIG. 3 shows a main part of a control valve type lead storage battery according to a second embodiment of the present invention.
The second embodiment is the upper lid 4 of the first embodiment described above.
The configuration of is changed. That is, the upper lid 11 is used instead of the upper lid 4 shown in FIGS. The upper lid 11 is provided with a recess 12 in which the explosion-proof filter 6 is housed, on the surface facing the top surface 2a of the safety valve 2, and when the safety valve 2 rises, the outer edge 12a of the recess 12 becomes the top surface 2a of the safety valve 2. It is configured to be in contact with each other. Therefore, the inner diameter of the recess 12 is equal to the safety valve 2
The outer diameter dimension R6 of the explosion-proof filter 6 can be inevitably smaller than the outer diameter dimension R2 of the safety valve 2.

A groove-shaped notch 12b is provided on the outer edge 12a of the recess 12, and the groove-shaped notch 12b acts as a passage for introducing the gas discharged from the inside of the battery to the explosion-proof filter 6.

In the second embodiment as described above, it is possible to obtain the same effect as that of the first embodiment.

(Third Embodiment) As shown in FIG. 4, the storage battery exhaust plugs 41 and 42 according to the third embodiment of the present invention have the safety valve structure shown in the first and second embodiments. I have it. That is, instead of the lid 1 in the first and second embodiments, an exhaust plug main body 43 is provided, which is provided with fixing means such as a screw portion 44 for fixing to the exhaust plug opening of the storage battery. By mounting the storage battery exhaust plug 41 or 42 on the exhaust plug of the storage battery, the control valve type lead storage battery according to the present invention can be constructed.

As described above, since the safety valve structure is not provided integrally with the battery but a separate exhaust plug is used, the diameter of the exhaust plug can be set to a larger value. It has the advantage that the liquid time can be shortened. In particular, it has a vertically elongated pole plate whose length dimension is set larger than the width dimension of the pole plate. Considering the battery life, the pole plate group is transformed into a battery case with a high compression rate exceeding 245 N / dm ^2. The stored battery has a slow permeation rate of the electrolytic solution into the electrode plate group. Therefore, by applying the storage battery exhaust plug according to the present invention to the control valve type lead storage battery having such a configuration, it is possible to obtain another effect of improving productivity by increasing the liquid injection speed.

[0031]

As described above, according to the present invention, it is possible to use an explosion-proof filter having a small diameter in a control valve type lead-acid battery having an explosion-proof filter, and to suppress clogging of the explosion-proof filter due to sulfuric acid mist or the like. As a result, it is possible to provide a valve-controlled lead-acid battery with a highly reliable, inexpensive and simple safety valve structure and an exhaust plug for the battery,
It is extremely useful industrially.

[Brief description of drawings]

FIG. 1 is a sectional view showing a main part of a control valve type lead storage battery according to a first embodiment of the present invention.

FIG. 2 is a sectional view showing a state in which a safety valve of the control valve type lead storage battery is opened.

FIG. 3 is a sectional view showing a main part of a control valve type lead storage battery according to a second embodiment of the present invention.

FIG. 4 is a sectional view showing an exhaust plug for a storage battery according to a third embodiment of the present invention.

FIG. 5 is a cross-sectional view showing a main part of a control valve type lead-acid battery according to a conventional example.

[Explanation of symbols]

1,51 lid 1a Space part 2,52 Safety valve 2a Top surface 3,53 Exhaust tube 4,11,54 Top lid 5 tube 5a Tip of cylinder 5b Notch 5c protrusion 6,55 Explosion-proof filter 6a facing surface 7 intervals 8 exhaust holes 12 recess 12a outer edge 12b Groove-shaped notch 41,42 Exhaust plug for storage battery 43 Exhaust plug body 44 screw part 56a, 56b vent 57 routes

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Kenji Kobayashi             1006 Kadoma, Kadoma-shi, Osaka Matsushita Electric             Sangyo Co., Ltd. F-term (reference) 5H012 AA01 BB02 DD03 GG05

Claims (7)

[Claims] 1. A control valve type lead storage battery in which a safety valve body is attached to an exhaust port provided in a battery exterior, wherein a recess is provided at a position corresponding to the safety valve body in an upper lid that covers the top surface of the safety valve body, An explosion-proof filter is provided in the recess, an outer diameter dimension of the explosion-proof filter is at least equal to or less than an outer diameter dimension of the safety valve body, and a facing surface of the explosion-proof filter facing the safety valve body is at least spaced from an outer edge of the recessed portion. A valve-regulated lead-acid battery which is located inside the recess and has a ventilation path formed between the battery inner space and the explosion-proof filter at the outer edge of the recess when the safety valve body is opened. 2. A control valve type lead storage battery in which a safety valve body is attached to an exhaust port provided on the exterior of the battery, the safety valve body being provided with a tubular portion whose tip is opposed to the top surface, and the inside of the tubular portion. An explosion-proof filter is provided, the outer diameter dimension of the explosion-proof filter is equal to or less than the outer diameter dimension of the safety valve body, and the facing surface of the explosion-proof filter facing the safety valve body is at least spaced from the tip of the tubular portion and is a tubular portion. A valve-regulated lead-acid battery, which is located inside and has a passage formed between the explosion-proof filter and the tubular portion to connect the inside and outside of the tubular portion. 3. The exhaust port is provided at the bottom of a space provided in the battery exterior, the cylinder is provided at an upper lid provided so as to cover the space, and the gas discharged from the explosion-proof filter is provided outside the battery. The valve-regulated lead-acid battery according to claim 2, wherein a path for discharging the lead-acid battery to the upper lid is provided in the upper lid. 4. An exhaust plug equipped with a safety valve that is mounted on the exterior of a battery and that opens and closes at a predetermined battery internal pressure, wherein the exhaust plug is configured by mounting a safety valve body on an exhaust port that connects the inside and outside of the battery. , A recess is provided at a position corresponding to the safety valve body of the cover covering the top surface of the safety valve body, the recessed portion is provided with an explosion-proof filter, the outer diameter dimension of the explosion-proof filter is at least less than or equal to the outer diameter dimension of the safety valve body, The facing surface of the explosion-proof filter facing the safety valve body is located at least inside the recess with a space from the outer edge of the recess, and when the safety valve body is opened, the space between the battery internal space and the explosion-proof filter is increased. An exhaust plug for a storage battery, wherein a ventilation path is formed at an outer edge of the recess. 5. An exhaust plug equipped with a safety valve that is mounted on the exterior of a battery and that opens and closes at a predetermined battery internal pressure, the exhaust plug comprising a safety valve body attached to an exhaust port that connects the inside and outside of the battery. The safety valve body is provided with a cylindrical portion whose top end is opposed to the top surface, and an explosion-proof filter is provided in the cylindrical portion, and the outer diameter dimension of the explosion-proof filter is equal to or less than the outer diameter dimension of the safety valve element, and the explosion-proof filter is The facing surface facing the safety valve body is located at least inside the tubular portion with a space from the tip of the tubular portion, and a passage that connects the inside and outside of the tubular portion within the space between the explosion-proof filter and the tubular portion. An exhaust plug for a storage battery, wherein the exhaust plug is formed. 6. The exhaust plug for a storage battery according to claim 4, wherein a cutout portion is provided as a part of the tip of the cylindrical portion or the outer edge of the recess as the passage. 7. A valve regulated lead storage battery equipped with the storage battery exhaust plug according to any one of claims 4 to 6.