JP2020004635A - Lead storage battery - Google Patents

Abstract

To provide a lead storage battery that can be applied to a liquid port plug having a short overall length, and suppresses a situation in which a liquid droplet is pushes up to an exhaust hole by gas, thereby making it possible to achieve both overflow resistance and gas exhaust properties.SOLUTION: A liquid port plug 10 includes a splash-proof body 13 in a cylinder 11 having an exhaust hole 14, and the splash-proof body 13 includes a first baffle plate 22 that regulates the opening at a gas upstream side of chambers SL and SR partitioned by a partition wall 21 to a predetermined opening 22K, and second and third baffle plates 23 and 24 provided in the respective chambers SL and SR and inclined obliquely with respect to an axial direction Z of the cylinder 11 and have the same inclination direction. The second baffle plate 23 is located at a gas downstream side of the opening 22K and overlaps with the opening 22K in the axial direction Z, and the third baffle plate 24 overlap with an opening positioned around the second baffle plate 23 in the axial direction Z.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a lead storage battery.

  A liquid port plug is attached to the lid of the lead storage battery. On the electrolyte surface side of the liquid stopper, a splash-proof plate is provided to prevent the liquid from rising inside the liquid stopper and leaking out of the battery. An explosion-proof filter is provided above the splash-proof plate, and an exhaust hole is provided at the top of the liquid stopper to discharge gas generated by charging and discharging to the outside of the battery to prevent the internal pressure of the battery from rising.

If the electrolytic solution accumulates in the liquid port plug due to the rise of liquid droplets due to vibration during use of the battery, or if the explosion-proof filter is wetted and the exhaust performance is reduced, the liquid may overflow from the battery. A splash-proof structure is being studied in order to prevent and suppress overflow from the battery.
For example, Patent Literature 1 discloses a configuration in which splash-proof plates (12, 13, 14) are arranged so as to have opposite inclinations at positions that are alternately opposed in the vertical direction. A splash-proof structure in which a plurality of baffles (41, 42, 43) inclined in a direction is arranged is disclosed. In Patent Document 3, concentric splash-proof cylinders (2, 2 ', 2 ") having different diameters and having slits (3) for degassing and refluxing are provided, and the positions of the slits are shifted by 180 degrees from each other. Disclosed is a liquid port plug (10) having a structure integrated with a conical lower lid (6).

Japanese Patent No. 4258701 JP 2005-197148 A JP-A-09-45305

  However, the configurations described in Patent Literatures 1 and 2 cannot be arranged unless the full length of the liquid port plug is sufficiently secured in order for the baffle plates to be inclined in opposite directions. For this reason, in the case of a liquid stopper having a short overall length, not only the inclination between the baffles cannot be sufficiently ensured, but also the reflux of the liquid becomes insufficient due to the narrow interval between the baffles, and the action of surface tension between the baffles. A liquid film is formed, and the liquid film bursts under the influence of gas generation due to charge and discharge to form new liquid droplets, and the newly generated liquid droplets may rise, leading to overflow.

The configuration described in Patent Literature 3 is easy to apply to a liquid stopper having a short overall length, but if the diameter of the liquid stopper is restricted, the number of splash-proof cylinders provided in concentric circles cannot be sufficiently secured, and the structure is close to the exhaust hole. There is a possibility that liquid droplets may easily enter the splash-proof cylinder. Depending on the distance between the splash-proof cylinders, the liquid droplets may form a liquid film between adjacent splash-proof cylinders due to the effect of surface tension, and the electrolyte may easily accumulate in the liquid stopper. Depending on the number of the splash-proof cylinders, the slit position of the adjacent splash-proof cylinders is displaced by 180 degrees, so that the gas flow path becomes longer, and the exhaust performance may be reduced.
Further, in each of Patent Documents 1 to 3, the rising and reflux path of the liquid droplet formed in a maze by the baffle plate and the discharge path of the generated gas are the same, so that the liquid droplet is exhausted from the baffle plate. If the gas reaches the side close to the hole, the liquid may be pushed up by the gas, leading to an overflow.

  Therefore, an object of the present invention is to apply the present invention to a liquid stopper having a short overall length, and to suppress a situation in which a liquid pushes up a liquid droplet to an exhaust hole, and to make it possible to achieve both overflow resistance and gas exhaustion. And

  In order to solve the above-described problem, the present invention provides a lead storage battery including a liquid port plug, wherein the liquid port plug includes a cylinder having an exhaust hole for gas exhaust, and a splashproof body provided in the cylinder. A partition wall that partitions the cylindrical body into a plurality of chambers communicating with the exhaust holes, a first baffle plate that regulates a gas upstream opening of each chamber to a predetermined small opening, A plurality of baffles are provided in the room, and are obliquely inclined with respect to the axial direction of the cylindrical body, and include a plurality of baffles having the same inclination direction, and the plurality of baffles are on the gas downstream side of the small opening. A second baffle plate that is positioned and overlaps the small opening in the axial direction, and an opening that is located downstream of the second baffle gas and that is vacant around the second baffle plate. A third baffle plate overlapping in the axial direction.

  The said structure WHEREIN: The said 3rd baffle board WHEREIN: The edge part close to the said 2nd baffle board may overlap with the said 2nd baffle board in the said axial direction.

  Further, in the above configuration, the inclination directions of the plurality of baffle plates may be opposite to each other across the partition wall.

  Further, in the above configuration, the small opening and the second and third baffles may be axially symmetric with respect to an axis passing through the center of the cylindrical body with the partition wall as a boundary.

  Further, in the above configuration, an end of the third baffle plate that is separated from the second baffle plate may extend to an end in a room partitioned by the partition.

  Further, in the above configuration, the plurality of baffles further include another baffle for controlling the course of liquid or gas in the cylinder, and the other baffle is the second or third baffle. At least one of the plates may overlap in the axial direction.

  Further, in the above configuration, the first baffle plate may have, as the small opening, a V-shaped notch whose opening width increases toward the outside in the radial direction of the cylindrical body.

  In the above configuration, an explosion-proof filter may be provided between the exhaust hole and the splash-proof body.

  ADVANTAGE OF THE INVENTION According to this invention, it can be applied to a liquid port plug with a short overall length, suppresses the situation where a liquid pushes up a liquid droplet to an exhaust hole, and makes it possible to achieve both overflow resistance and gas exhaustability.

It is a perspective view of the lead storage battery concerning a 1st embodiment of the present invention. It is the perspective sectional view which cut out some liquid mouth stoppers. It is the figure which looked at the liquid port plug from a different direction, the code | symbol A has shown the internal structure, the code | symbol B has shown the figure seen from below, and the code | symbol C has shown sectional drawing. It is the perspective view which looked at the splash-proof body from a different direction, code | symbol A has shown the perspective view which looked at the splash-proof body from diagonally upward, and the code | symbol B has shown the perspective view seen from diagonally downward. It is a figure which shows a splash-proof body, the code | symbol A has shown the top view of the splash-proof body, the code | symbol B has shown the side view of the splash-proof, and the code | symbol C has shown the bottom view of the splash-proof. It is a figure which shows a splash-proof body, and code | symbol A and B have shown the side view which looked at the splash-proof body from a different direction. It is a figure provided for explanation of the flow of the liquid (dashed-dotted line W) and gas (dashed line G) in a liquid stopper. It is a perspective view of the splashproof in the liquid stopper of the lead storage battery concerning a 2nd embodiment. It is a figure provided for explanation of the flow of the liquid (dashed-dotted line W) and gas (dashed line G) in a liquid stopper. It is a perspective view of a splashproof body in a liquid mouth stopper of a lead storage battery concerning a 3rd embodiment. It is a figure provided for explanation of the flow of the liquid (dashed-dotted line W) and gas (dashed line G) in a liquid stopper. It is a perspective view of a splashproof body in a liquid stopper of a lead storage battery concerning a 4th embodiment. It is a figure provided for explanation of the flow of the liquid (dashed-dotted line W) and gas (dashed line G) in a liquid stopper. It is a figure which shows the splash-proof body in the liquid stopper of the lead storage battery which concerns on 5th Embodiment, code | symbol A is the perspective view which looked at the splash-proof from diagonally lower part, and code | symbol B is the figure which looked at the liquid stopper from below. Is shown. It is a figure provided for explanation of the flow of the liquid (dashed-dotted line W) and gas (dashed line G) in a liquid stopper. It is a figure which shows a prior art example, The code | symbol A has shown the perspective view of the splash-proof body of the conventional example 1, and the code | symbol B has shown the cross-sectional perspective view of the liquid port plug of the conventional example 2 with a splash-proof body.

Hereinafter, embodiments of the present invention will be described.
(1st Embodiment)
FIG. 1 is a perspective view of a lead storage battery according to the first embodiment of the present invention.
The lead storage battery 1 includes a rectangular parallelepiped battery body 2 and a plurality of terminals 3 protruding outside the battery body 2, and is mounted on a vehicle such as a four-wheeled vehicle. The battery main body 2 is provided with a box-shaped battery case 2A in which the inside is divided into a plurality of cell chambers and a plurality of electrode plates are arranged in each cell room, and a lid 2B that covers an upper opening of the battery case 2A. . The battery case 2A and the lid 2B are formed of a resin material such as polypropylene (PP).
A plurality of liquid port stoppers 10 are provided on the lid 2B. These liquid port plugs 10 block the liquid injection ports for injecting the electrolyte into each cell. The plurality of terminals 3 include a positive terminal and a negative terminal.

  FIG. 2 is a perspective sectional view in which a part of the liquid stopper 10 is cut away. FIG. 3 is a diagram of the liquid port plug 10 as viewed from a different direction, where A is a diagram showing the internal structure, B is a diagram viewed from below, and C is a cross-sectional view. In each of the drawings, the symbol Z indicates the direction along the axis CP passing through the center of the liquid port plug 10, and corresponds to the upward direction when the battery is installed. In the following description, each direction, such as up and down, corresponds to the direction when the battery is installed.

As shown in FIGS. 2 and 3, the liquid stopper 10 includes a hollow cylindrical body 11 that forms a liquid stopper main body, an explosion-proof filter 12 and a splash-proof body 13 provided in the cylindrical body 11. It has.
The axis CP is also an axis passing through the centers of the cylindrical body 11 and the splashproof body 13.
The cylindrical body 11 and the splash-proof body 13 are formed by integral molding using a resin material such as polypropylene (PP). An exhaust hole 14 for exhausting gas for discharging gas generated by charging and discharging to the outside of the lead-acid battery 1 and preventing an increase in the internal pressure of the lead-acid battery 1 is provided at an upper portion of the cylinder 11. An explosion-proof filter 12 and a splash-proof body 13 are sequentially mounted below the explosion-proof filter 12 in an internal space connected below the exhaust hole 14.

  In some cases, the explosion-proof filter 12 is omitted, and only the splash-proof body 13 is mounted in the internal space connected below the exhaust hole 14. When the explosion-proof filter 12 is installed, a step or a projection may be provided in the cylindrical body 11 to regulate the distance between the explosion-proof filter 12 and the exhaust hole 14, or the explosion-proof filter 12 may contact the exhaust hole 14. May be.

  The cylindrical body 11 is provided with a flange portion 15 having a larger diameter than the cylindrical body 11, and a screw portion 16 is formed on an outer peripheral surface below the flange portion 15. The cylindrical body 11 is fixed to the lid 2B by screwing the screw portion 16 into the liquid inlet of the lid 2B of the battery body 2. On the lower surface of the flange portion 15, a packing 17 for closing a gap between the flange portion 15 and the cover 2B is provided.

The explosion-proof filter 12 is fitted between the exhaust hole 14 and the splash-proof body 13 to prevent external static electricity and sparks from entering the lead-acid storage battery 1 and enhance the flammability resistance. A known filter can be applied to the explosion-proof filter 12.
The splash-prevention body 13 is located above the liquid level of the electrolytic solution, and allows exhaustion of gas generated by charging and discharging, while preventing overflow of the electrolytic solution due to vibration during traveling of the vehicle equipped with the lead-acid battery 1. I do.

As shown by reference numeral C in FIG. 3, the splash-proof body 13 includes a partition 21 that partitions the inside of the cylindrical body 11 into a plurality (two in the present embodiment) of chambers SL and SR that communicate with the exhaust hole 14. A first baffle plate 22 that regulates the lower opening of the internal space of the cylindrical body 11 to a predetermined small opening is integrally provided at a lower end of the cylindrical body 11.
The partition 21 extends in a direction orthogonal to the axis CP with respect to the axis CP of the cylinder 11, and is formed on a wall that equally divides a circular cross section of the cylinder 11 into a semicircle. The partition 21 is provided upright from the first baffle plate 22 to a height close to the explosion-proof filter 12.

The first baffle plate 22 is provided with a pair of openings 22K extending from the outer peripheral edge toward the axis CP in a perfect circular plate that covers the lower opening of the cylindrical body 11, as indicated by reference numeral B in FIG. It is formed in a shape. As a result, the opening below the liquid stopper 10 is narrowed down to only the pair of openings 22K.
One opening 22K functions as a small opening communicating with the room SL partitioned by the wall, and the other opening 22K functions as a small opening communicating with the room SR partitioned by the wall.

Here, when the opening area of the opening 22K is large, it is necessary to lengthen the second baffle plate 23 so as to overlap the small opening. Since the inclination of the second baffle plate 23 and the third baffle plate 24 is regulated by the height of the partition 21, the inclination is regulated when the second baffle plate 23 arranged to overlap the opening 22 </ b> K is lengthened. Even if it is inclined as far as possible within the height, the inclination becomes gentle. The effect of bending the course of the liquid droplet to the upper right becomes smaller as the inclination becomes gentler. In addition, the reflux property of the liquid drops is reduced due to the gentle inclination. As the opening area increases, the amount of rise of the liquid droplets increases, while the recirculation property deteriorates, and the liquid droplets may accumulate above the second baffle plate 23 and may easily rise.
When the opening area of the opening 22K is small, the amount of liquid directly rising is suppressed, but there is a possibility that a liquid film is formed in the opening 22K and the liquid film pops up when the gas is exhausted. The smaller the opening area, the worse the recirculation property, and the more likely it is to form a liquid film in the opening 22K. If the opening area is smaller, the rise of liquid droplets may be completely suppressed, but there is a risk that gas cannot be exhausted at all.
That is, the opening area of the opening 22K may be freely set within a range that suppresses the rise of the liquid droplets, does not hinder the reflux, and further does not hinder the gas exhaustability.

The pair of openings 22 </ b> K are formed at positions and shapes that are axially symmetric with respect to the axis CP, and more specifically, are provided at intervals of 180 degrees when viewed from the underside of the splash-proof body 13, and 11 is formed in a V-shaped notch in which the opening width increases toward the outside in the radial direction. Since the opening is formed in the V-shaped notch whose opening width changes, the formation of a liquid film covering the opening 22K due to the effect of surface tension can be suppressed. As a result, it is possible to suppress a situation in which the liquid film bursts and becomes a new liquid droplet due to the influence of gas generation.
The opening 22K may have a hole shape such as a circular hole, a rectangular hole, or a slot hole, or a notch such as a semicircle, a square, a slot, or a wave as long as the formation of the liquid film is suppressed. A V-shaped notch that suppresses the rise of liquid droplets, does not impede reflux, and can secure an opening area that does not impede gas exhaustability, and has good productivity is preferable.

4 shows a perspective view of the splash-proof body 13 as viewed obliquely from above, and reference numeral B shows a perspective view as viewed obliquely from below. In FIG. 5, reference symbol A indicates a top view of the splash proof body 13, reference letter B indicates a side view of the splash proof body 13, and reference letter C indicates a bottom view of the splash proof body 13. Further, reference numerals A and B in FIG. 6 show side views of the splash-proof body 13 viewed from different directions.
As shown in these figures, the partition wall 21 of the splash-proof body 13 has a second baffle plate 23 located downstream of each opening 22K on the gas side and a second baffle plate located downstream of the second baffle plate 23 on the gas side. The third baffle plate 24 is integrally provided.

  The second baffle plate 23 extends outward from both side surfaces of the partition wall 21 in the outer peripheral direction, is in contact with the inner peripheral surface of the cylindrical body 11, and is obliquely inclined with respect to the axial direction Z of the cylindrical body 11. It is formed in the shape of a vane. The second baffle plates 23 are provided one by one in the chambers SL and SR partitioned by the partition 21, and are formed at positions and shapes symmetrical with respect to the axis CP with respect to the partition 21. These second baffle plates 23 overlap with the openings 22K in the axial direction Z, as indicated by reference numeral B in FIG.

As shown in FIGS. 5 and 6, the third baffle plate 24 extends in the outer peripheral direction from both side surfaces of the partition wall 21 on the gas downstream side of the second baffle plate 23, and the inner peripheral surface of the cylindrical body 11. And is formed in a blade shape that is obliquely inclined with respect to the axial direction Z of the cylindrical body 11.
The third baffle plates 24 are provided two at a time in the circumferential direction of the axis CP in the chambers SL and SR partitioned by the partition 21, and are symmetric with respect to the axis CP with respect to the partition 21. It is formed in a position and a shape.

  These third baffle plates 24 are inclined in the same direction as the second baffle plates 23 in the same chambers SL and SR, and surround the second baffle plate 23 as shown by reference numeral B in FIG. And the openings K1 and K2 overlap in the axial direction Z. That is, the third baffle plates 24 are provided so as to overlap in the axial direction Z with the openings K1 and K2 formed on the left and right sides of the second baffle plate 23, respectively.

Here, as shown by the symbol B in FIG. 5, the right third baffle plate 24 is such that the end 24A close to the second baffle plate 23 overlaps with the second baffle plate 23 in the axial direction Z. The end 24B separated from the second baffle plate 23 extends to the end in the chamber SL partitioned by the partition 21.
The left third baffle plate 24 has an end 24C that is close to the second baffle plate 23 in the axial direction Z and extends to the opposite end in the chamber SL, and the second baffle plate in the axial direction Z. An end portion 24 </ b> D that is separated from 23 overlaps another third baffle plate 24 in the axial direction Z.
When the height of the splash-proof body 13 is low, the end 24B and the end 24C move due to the inclination of the second baffle plate 23 and the third baffle plate 24 when a gap is formed at the end in the chamber SL. The liquid may move upward from the gap formed at the end in the chamber SL, wet the explosion-proof filter 12, and reduce the gas exhaustability. However, this does not apply when the height of the splash-proof body 13 can be sufficiently secured.
Note that the first to third baffle plates 24 are preferably arranged with a gap of at least 2 mm or more in the axial direction Z. In addition, even if it is less than 2 mm, it may be less than 2 mm in the case where overflow resistance and gas exhaustability as described later can be ensured.

  The flow of the liquid droplets of the electrolytic solution due to external vibration and the flow of the gas generated in the lead storage battery 1 will be described. FIG. 7 shows the basic flow of the liquid droplet in the chamber SL by a dashed-dotted line denoted by reference symbol W, and the basic flow of the gas by a broken line denoted by reference symbol G. Note that the flows of the liquid droplets and the gas in the chamber SR are flows that are axially symmetric with respect to the axis CP. Further, depending on the direction of vibration and the like, there may be a flow other than those indicated by the reference numerals W and G, and this point will also be described.

  As shown in FIG. 7, the lower surface, which is the surface on the electrolyte side, of the liquid port plug 10 is covered with the first baffle plate 22, so that a large amount of liquid droplets flowing into the liquid port plug 10 is avoided. You. The amount of liquid and gas flowing in depends on the area of the opening 22K of the first baffle plate 22. In this configuration, since the opening area of the opening 22K is set to a range that suppresses the rise of liquid droplets, does not hinder reflux, and does not hinder gas exhaustability, it is necessary to achieve both overflow resistance and gas exhaustability. Can be.

  When liquid and gas flow from the opening 22K of the first baffle plate 22, the second baffle plate 23 that overlaps the opening 22K in the axial direction Z suppresses the momentum of the liquid and gas. By the inclination of the second baffle plate 23, the liquid droplets are guided to the upper right in FIG. 7, and the third baffle plate 24 is located on that side. In 7 you will be guided to the upper right. As shown in FIG. 7, the end 24B of the third baffle 24, which is separated from the second baffle 23, extends to the end in the chamber SL, so that the upward movement of the liquid droplet is blocked. .

Even if the momentum of the liquid droplet is strong due to the influence of the external vibration, and the liquid droplet passes between the third baffle plate 24 and the second baffle plate 23 and moves to the left in FIG. Since the liquid is guided obliquely downward and leftward along the slope of the baffle plate 24, the liquid droplet is unlikely to move upward. In this case, even if the liquid droplet moves upward due to stronger upward momentum of the liquid droplet, another third baffle plate 24 is located above the liquid droplet, so that the liquid droplet moves upward. Movement is suppressed.
That is, the liquid which has risen flows down to the first baffle plate 22 along the inclination of the third baffle plate 24 and the second baffle plate 23 in accordance with the gravity, and leads from the opening 22K of the first baffle plate 22. It flows back into the storage battery 1. It is preferable that the first baffle plate 22 is provided with an inclination from the ends in the chambers SL and SR partitioned by the partition 21 toward the opening 22K.
In this manner, the course of the liquid droplets is determined by the inclination of the second and third baffle plates 24, the movement of the liquid droplets to the exhaust holes 14 is restricted, and the liquid droplets that have risen are easily circulated. Can be.

As shown in FIG. 7, a gap is formed between the first and second baffle plates 22 and 23 and between the second and third baffle plates 23 and 24 so as to prevent the liquid droplets from traveling. Therefore, the gas generated in the lead storage battery 1 can pass through this gap.
Specifically, the gas passes through the gap provided between the second baffle plate 23 and the opening 22K, and travels along the second baffle plate 23 and the third baffle plate 24 in the same manner as the liquid droplets. Not only does it flow upward and to the right, it also flows to the left side, which is the opposite side of the course of the liquid, and passes between the third baffle plate 24 and the second baffle plate 23 located above the exhaust hole. 14.
As described above, since a path through which gas can flow can be secured separately from the path of the liquid droplets, the gas can be smoothly moved to the exhaust holes 14.

Note that, depending on the direction and intensity of the vibration acting on the lead storage battery 1, the liquid droplets pass through the gaps between the second baffle plate 23 and the first baffle plate 22 and are similar to the gas flow described above. May move to the left. In this case, since the third baffle plate 24 is located above and the path to the exhaust hole 14 is formed relatively long, it is possible to suppress the situation in which the liquid droplets move to the exhaust hole 14 and to raise The liquid droplets can be refluxed.
In this way, even if the liquid droplet moves in various directions, the situation where the liquid droplet moves to the exhaust hole 14 can be suppressed by the second and third baffle plates 23 and 24.
In addition, the chamber SL and the chamber SR partitioned by the partition 21 have the inclination directions of the first to third baffle plates 22 to 24 opposite to each other. It becomes easy to secure the overflow resistance against waving.

  As described above, the splash-preventing body 13 is configured such that the partition 21 that partitions the inside of the cylindrical body 11 into the plurality of chambers SL and SR that communicates with the exhaust hole 14, and that the openings on the gas upstream side of the chambers SL and SR have a predetermined opening. A first baffle plate 22 for regulating the portion 22K, and a second and third baffle provided in each of the chambers SL and SR, which are obliquely inclined with respect to the axial direction Z of the cylindrical body 11 and whose inclination directions are the same. Baffle plates 23 and 24 are provided. The second baffle plate 23 is located on the gas downstream side of the opening 22K and overlaps the opening 22K in the axial direction Z, and the third baffle plate 24 is provided around the second baffle plate 23. The openings K1 and K2 are vacantly overlapped in the axial direction Z.

  According to these configurations, after the momentum of the liquid droplets is reduced by the first baffle plate 22, the liquid droplets can be guided along the same direction of inclination of the second and third baffle plates 23, 24. In addition to the course of the liquid droplets, the gas can flow into the space vacated on the opposite side, and the gas can be guided to the exhaust hole 14. In this configuration, gas can flow in separately from the path of liquid droplets even with a liquid port plug with a short overall length, compared to the conventional configuration that requires a longer overall length in order to make the baffle plates tilt in opposite directions. A complicated course can be secured, and there is no need to provide a complicated maze-like path structure. Therefore, the present invention can be applied to a liquid port plug having a short overall length, suppresses a situation in which a liquid pushes up a liquid droplet to an exhaust hole 14, and makes it possible to achieve both overflow resistance and gas exhaustability.

In addition, since the third baffle 24 has an end 24A (see reference sign B in FIG. 5) close to the second baffle 23, the third baffle 24 overlaps the second baffle 23 in the axial direction Z. The liquid droplets guided to the baffle plate 23 can be guided more reliably by the third baffle plate 24.
Further, since the inclination directions of the second and third baffle plates 23 and 24 are opposite to each other with the partition wall 21 interposed therebetween, the second baffle plate 23 and the third baffle plate 24 are resistant to spillage due to liquid droplets or waving of electrolyte caused by horizontal vibration. Is easy to secure.

The opening 22K and the second and third baffle plates 23 and 24 are axially symmetric with respect to the axis CP passing through the center of the cylinder 11 with the partition 21 as a boundary. A configuration in which the baffle plates 23 and 24 are inclined in the reverse direction can be simply designed, and the integral molding is facilitated.
Further, an end 24B of the third baffle plate 24 that is separated from the second baffle plate 23 (see reference numeral B in FIG. 5) extends to an end in the chamber SL partitioned by the partition wall 21, so that the third baffle plate The liquid droplets guided by the baffle plate 24 can be easily blocked in the chamber SL.

Further, the opening 22K provided in the first baffle plate 22 is formed in a V-shaped notch in which the opening width increases toward the outside in the radial direction of the cylinder 11, so that the liquid film is formed by the action of surface tension. Can be suppressed from being formed. Accordingly, it is possible to suppress a situation in which the liquid film bursts and becomes a new liquid droplet due to the influence of gas generation accompanying charge and discharge.
The opening 22K may have a hole shape such as a circular hole, a rectangular hole, or a slot hole, or a notch such as a semicircle, a square, a slot, or a wave as long as the formation of the liquid film is suppressed. A V-shaped notch that suppresses the rise of liquid droplets, does not impede reflux, and can secure an opening area that does not impede gas exhaustability, and has good productivity is preferable.

In addition, since the total opening area of each opening 22K is set to a range that suppresses the rise of liquid droplets, does not hinder reflux, and does not hinder gas exhaustability, both overflow resistance and gas exhaustability are compatible. can do.
In addition, since the explosion-proof filter 12 is provided between the exhaust hole 14 and the splash-proof body 13, external static electricity and sparks can be prevented from entering the lead-acid battery 1.

(2nd Embodiment)
FIG. 8 is a perspective view of the splash-proof body 13 inside the liquid port plug 10 of the lead storage battery 1 according to the second embodiment. FIG. 9 is a diagram showing the flow W of the liquid droplets and the flow G of the gas in the chamber SL of the liquid port plug 10.
The second embodiment differs from the first embodiment in that it has first and second auxiliary baffles 25 and 26 that function as other baffles that control the course of liquid or gas in the liquid stopper 10. The same is true. The same components as those in the first embodiment are denoted by the same reference numerals, and redundant description will be omitted.

As shown in FIGS. 8 and 9, the first auxiliary baffle plate 25 is disposed on the inclined upper end side of the second baffle plate 23 and on the upstream side of the third baffle plate 24 on the right side. 23 and 24 are the same inclination direction. This prevents a part of the liquid droplets from rising along the flow W as shown in FIG.
The second auxiliary baffle plate 26 is disposed on the lower end side of the second baffle plate 23 and on the upstream side of the third baffle plate 24 on the left side, and the inclination directions of these baffle plates 23 and 24 are the same. It is. Even if the liquid droplet moves to the left between the second baffle plate 23 and the first baffle plate 22 through the same path as the flow G, even if the liquid droplet moves Can hinder the climb. Further, as shown in a flow G in FIG. 9, the gas can flow into the exhaust hole 14 through a path below or above the second auxiliary baffle plate 26, so that the flow of the gas is Not disturbed.

  Thus, by providing the first and second auxiliary baffles 26, 26, it becomes easier to secure the overflow property. The third auxiliary baffle plate is not limited to the first and second auxiliary baffle plates 25 and 26 and is provided downstream of the third baffle plate 24 to prevent the rise of liquid droplets and to secure a gas discharge path. May be arranged. The positions and numbers of the first to third auxiliary baffles 25 and 26 may be changed as appropriate.

(Third embodiment)
FIG. 10 is a perspective view of the splash-proof body 13 in the liquid port plug 10 of the lead storage battery 1 according to the third embodiment. FIG. 11 is a diagram showing a flow W of a liquid droplet and a flow G of a gas in the chamber SL of the liquid port plug 10.
The third embodiment is different from the first embodiment in that three third baffles 24 are provided.
As shown in FIGS. 10 and 11, the third baffle plate 24 is formed to be smaller than the third baffle plate 24 of the first embodiment, and is formed in the circumferential direction of the splash-proof body 13 (the circumference of the axis CP). (Coincides with the direction).

  These third baffle plates 24 respectively overlap the openings formed on the left and right sides of the second baffle plate 23 in the axial direction Z, and regulate the rise of liquid droplets. In the present configuration, since the third baffle plates 24 are arranged at intervals in the circumferential direction of the splash-proof body 13 (coincident with the circumferential direction of the axis CP), as shown by reference numeral G in FIG. Gas can flow between the third baffle plates 24 and be guided to the exhaust holes 14. That is, a plurality of gaps through which the gas can pass can be secured, and the gas can easily flow to the exhaust hole 14 easily.

(Fourth embodiment)
FIG. 12 is a perspective view of the splash-proof body 13 in the liquid port plug 10 of the lead storage battery 1 according to the fourth embodiment. FIG. 13 is a diagram showing a flow W of a liquid droplet and a flow G of a gas in the chamber SL of the liquid port plug 10.
The fourth embodiment is different from the first embodiment in that the number of the second baffle plates 23 is two.
As shown in FIGS. 12 and 13, the upstream end 23A (FIG. 13) of one second baffle plate 23 located on the right side overlaps a part of the opening 22K in the axial direction Z, and The downstream end portion 23B of the other second baffle plate 23 located overlaps the remaining portion of the opening 22K in the axial direction Z. For this reason, as shown by the reference sign W in FIG. 13, a gap into which the liquid droplet flows can be secured between the second baffle plates 23. Thereby, the location through which the liquid droplets pass can be expanded, and the liquid droplets can be guided to the third baffle plates 24 by the plurality of second baffle plates 23. Therefore, even if the liquid droplets flow in a relatively large amount, the rise of the liquid droplets is suppressed, and the liquid particles are easily refluxed.

  In this case, as shown by reference numeral G in FIG. 11, in addition to the right side of the second baffle plate 23 and the space between the two second baffle plates 23, the left baffle plate 23 is further provided. The path of the gas is secured on the left, and the gas can be guided to the exhaust hole 14. Even if the liquid droplets flow along the path of the gas, the upward movement of the liquid droplets can be suppressed by the third baffle plate 24 on the left side.

(Fifth embodiment)
FIG. 14 is a view showing the splash-proof body 13 in the liquid spout 10 of the lead-acid battery 1 according to the fifth embodiment. The figure which looked at the stopper 10 from the lower part is shown. FIG. 15 is a view showing the flow W of the liquid droplet and the flow G of the gas in the chamber SL of the liquid port stopper 10.
The fifth embodiment is the same as the fourth embodiment except that it has an opening 22K that is longer in the circumferential direction than the opening 22K of the first baffle plate 22. As shown in FIG. 14, the first baffle plate 22 has, as the opening 22 </ b> K, a pair of recesses recessed from the outer peripheral edge toward the axis CP, and the total opening area of the pair of recesses is equal to the first opening. To the total opening area of the openings 22K of the fourth to fourth embodiments.

These recesses are also formed in V-shaped notches whose opening width gradually increases, similarly to the above-described opening 22K, so that a liquid film covering the opening 22K is formed by the action of surface tension. Can be suppressed.
Since the first baffle plate 22 has an opening 22K that is relatively long in the circumferential direction, as shown in FIG. 15, a region long in the circumferential direction of the left and right second baffle plates 23 is effectively used. Thus, the momentum of the liquid droplet can be suppressed, and the liquid can be guided toward the third baffle plate 24. Also, as shown in FIG. 15, the opening 22K expands to a position distant from the liquid flow W, so that gas flows in from a position distant from the liquid flow W, and flows along the course shown in FIG. Easier to flush. In this manner, the gas can be guided to a path through which the gas can flow, separately from the path of the liquid droplets, and it becomes easier to achieve both the resistance to overflow and the property to exhaust gas.

  Table 1 shows the results of a vibration experiment simulating a gas generation state using a simple water tank with respect to the conventional examples 1 and 2 and the splashproof body 13 of the first to fifth embodiments, and comparing the durability time until overflow. Is shown. The vibration test conditions were as follows: the separation distance from the splash-proof body to the liquid surface was 30 [mm], the vibration frequency was 33.3 [Hz], the acceleration was 7.0 ± 0.1 G, and the gas emission amount was 0.05 [L / min]. An explosion-proof filter 12 and a splash-proof body 13 were mounted inside a cylinder 11 of the liquid stopper 10. The simple water tank in which the liquid port plug 10 was screwed was vibrated under the above-mentioned vibration test conditions, and the time required for the liquid to rise as the explosion-proof filter 12 became wet and for the liquid to spout above the exhaust hole 14 was determined. The overflow resistance was expressed as a ratio when Conventional Example 1 was set to 1.

FIG. 16 is a diagram showing a conventional example, in which reference numeral A is a perspective view of the splash-proof body 31 of Conventional Example 1, and reference sign B is a cross-sectional perspective view of a liquid-port plug 41 of the prior-art example 2 having an integrated splash-proof body. Is shown.
The splash-proof body 31 of Conventional Example 1 has a dust-proof structure in which a plurality of baffle plates 32, 33, 34 that are inclined in opposite directions are arranged. The liquid port stopper 41 of Conventional Example 2 is provided with concentric splash-proof cylinders 42, 43 and 44 having different diameters and having slits 41S for venting and refluxing, and disposing the slits 41S at positions shifted from each other by 180 degrees. , A dustproof structure integrated with the conical lower lid 45.

Embodiments 1 to 5 were confirmed to have 1.75 times or more the resistance to overflow compared to the case where Conventional Example 1 was used as a reference.
In the splash-proof body 31 of the first conventional example, the space formed by the baffle plates 32, 33, and 34 acts in the same way on the course of the liquid droplet and the course of the gas. Since the space formed by each of the splash-proof cylinders 42, 43, and 44 acts in the same way on the course of the liquid and the course of the gas, the ascended liquid is further pushed up by the gas and reaches the downstream side of the gas. It was found that liquid overflowed with gas exhaust.
On the other hand, since the splashproof body 13 of the first to fifth embodiments has a path through which gas can flow in addition to the course of the liquid droplet, the action of the gas to push up the liquid droplet can be suppressed, and And gas exhaustability.

  The embodiments described above merely show one aspect of the present invention, and can be arbitrarily modified and applied without departing from the gist of the present invention. For example, the shape and number of the baffle plates 22 to 26 and the openings 22K, which are the components of the splash-proof body 13, may be changed as appropriate. In addition, the case has been described in which the partition wall 21 that partitions the interior of the cylindrical body 11 into two chambers SL and SR is provided on the splash-proof body 13, but the partition wall 21 that partitions the interior of the cylindrical body 11 into three or more chambers is provided. May be configured in the same manner as in the chambers SL and SR. Further, the shape of the cylindrical body 11 is not limited to the shape shown in FIG. 2, and the lead storage battery 1 is not limited to the configuration shown in FIG. 1, and widely known lead storage batteries can be applied.

DESCRIPTION OF SYMBOLS 1 Lead storage battery 2 Battery main body 2A Battery case 2B Lid 3 Terminal 10 Liquid stopper 11 Cylindrical body 12 Explosion-proof filter 13 Splashproof body 14 Exhaust hole 21 Partition wall 22 First baffle plate 22K Opening 23 Second baffle plate 24 Third Baffles 24A, 24B End of third baffle
25 first auxiliary baffle plate 26 second auxiliary baffle plate 31 splash-proof body 32, 33, 34 of prior art example 1 baffle board of splash-proof body 31 liquid stoppers 42, 43, 44 of prior art example 2 liquid stopper 41 Splash-proof tube 45 Lower lid of liquid port stopper 41 CP Axis K1, K2 Opening SL, SR room Z Axis direction G Gas flow W Liquid flow

In order to solve the above-described problem, the present invention provides a lead storage battery including a liquid port plug, wherein the liquid port plug includes a cylinder having an exhaust hole for gas exhaust, and a splashproof body provided in the cylinder. A partition wall that partitions the cylindrical body into a plurality of chambers communicating with the exhaust holes, a first baffle plate that regulates a gas upstream opening of each chamber to a predetermined small opening, A plurality of baffles that are provided in the room and that are obliquely inclined with respect to the axial direction of the cylindrical body and that have the same inclination direction, and in each room, the inclination direction of all the baffles provided in the room. Are in the same direction, the plurality of baffles are located on the gas downstream side of the small opening, and overlap with the small opening in the axial direction; and the second baffle Is located downstream of the gas and in front of an opening vacant around the second baffle plate. Characterized in that it comprises a third baffle overlapping in the axial direction.

Claims (8)

In a lead-acid battery with a liquid port plug,
The liquid port stopper includes a cylinder having an exhaust hole for gas exhaust, and a splash-proof body provided in the cylinder.
The splash-proof body,
A partition partitioning the cylindrical body into a plurality of chambers communicating with the exhaust holes,
A first baffle plate for regulating the gas upstream opening of each chamber to a predetermined small opening;
Provided in each room, comprising a plurality of baffles that are obliquely inclined with respect to the axial direction of the cylindrical body and have the same inclination direction.
The plurality of baffles are located on the gas downstream side of the small opening, and a second baffle that overlaps the small opening in the axial direction, and on the gas downstream side of the second baffle. A third baffle plate, which is located around the second baffle plate and has a third baffle plate that overlaps in the axial direction at an opening vacant around the second baffle plate.   2. The lead-acid battery according to claim 1, wherein an end of the third baffle near the second baffle overlaps the second baffle in the axial direction. 3.   The lead-acid battery according to claim 1, wherein an inclination direction of the plurality of baffles is opposite to each other with the partition wall interposed therebetween.   The lead according to claim 3, wherein the small opening and the second and third baffles are axially symmetric with respect to an axis passing through the center of the cylinder with the partition as a boundary. Storage battery.   The end of the third baffle, which is separated from the second baffle, extends to an end in a room partitioned by the partition. The lead-acid battery according to claim 1. The plurality of baffles further include another baffle for controlling the course of liquid or gas in the cylinder,
The lead-acid battery according to any one of claims 1 to 5, wherein the other baffle overlaps at least one of the second or third baffle in the axial direction.   The said 1st baffle board has the V-shaped notch which the opening width expands toward the radial direction outer side of the said cylindrical body as the said small opening, The one of Claim 1 thru | or 6 characterized by the above-mentioned. A lead-acid battery according to claim 1.   The lead-acid battery according to any one of claims 1 to 7, further comprising an explosion-proof filter between the exhaust hole and the splash-proof body.

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