WO2023085016A1

WO2023085016A1 - Stopper for storage batteries, and storage battery

Info

Publication number: WO2023085016A1
Application number: PCT/JP2022/038858
Authority: WO
Inventors: 貴聡河上; 真之前田; 遼司奥野; 誠武藤
Original assignee: 株式会社Ｇｓユアサ
Priority date: 2021-11-10
Filing date: 2022-10-19
Publication date: 2023-05-19

Abstract

A liquid port stopper 30 comprises a stopper body 40, a lid member 80, and a filter 100. The stopper body 40 has a cylindrical shape having at an upper part thereof a first outer peripheral wall 41, and at a lower part thereof a second outer peripheral wall 51 which is smaller in diameter than the first outer peripheral wall 41. The lid member 80 is provided with a lid body 81 that opens and closes an upper opening in the stopper body 40 and an inner wall part 85 that is formed on the back surface of the lid body 81. With respect to the first outer peripheral wall 41 of the stopper body 40, the inner wall part 85 is positioned inward of the first outer peripheral wall, and with respect to the second outer peripheral wall 51, the inner wall part 85 is positioned above the second outer peripheral wall. The filter 100 is positioned on the back surface of the stopper body 40 and outward of the inner wall part 85. The stopper body 40 and/or the lid member 80 has, at a position corresponding to a gas outlet surface of the filter 100, a discharge part 49, 89 for discharging a gas G that has passed through the filter 100.

Description

Storage battery plug, storage battery

The present invention relates to plugs used in storage batteries.

The plug of the storage battery has a filter on the exhaust passage for the gas generated inside the battery to remove the electrolyte acid fog contained in the gas. The liquid spout plug disclosed in Patent Document 1 below accommodates a filter in an inner cylindrical portion provided on the back surface of the lid. A labyrinth-like gas passage is provided outside the inner cylindrical portion. After passing through the filter, the gas generated in the container moves through the labyrinthine gas passage and is exhausted to the outside.

JP 2015-50114 A

In the above structure, unnecessary components such as electrolyte acid mist contained in the gas can be removed by the filter accommodated in the inner wall portion (inner cylindrical portion). However, since a maze-shaped gas passage is provided on the outer periphery of the inner wall (inner cylinder), the structure for exhausting gas is complicated, and it takes time to exhaust the gas that has passed through the filter to the outside of the plug. It takes.
SUMMARY OF THE INVENTION An object of the present invention is to reduce the risk of gas ignition due to an external ignition point by suppressing leakage of an electrolytic solution, exhausting gas in a short period of time after passing through a filter.

The storage battery plug disclosed by this specification includes a plug body, a lid member, and a filter. The plug body has a cylindrical shape having a first outer peripheral wall on the top and a second outer peripheral wall having a diameter smaller than that of the first outer peripheral wall on the bottom.

The lid member includes a lid body that opens and closes the upper opening of the plug body, and an inner wall portion formed on the back surface of the lid body. The inner wall portion is located inside the first outer peripheral wall in relation to the first outer peripheral wall of the plug body and above the second outer peripheral wall in relation to the second outer peripheral wall.

The filter is located on the back surface of the plug body and outside the inner wall portion. At least one of the plug main body and the lid member has an exhaust portion for exhausting gas that has passed through the filter at a position corresponding to the gas outlet surface of the filter.

According to the present invention, leakage of electrolyte can be suppressed. Moreover, the gas that has passed through the filter can be exhausted in a short period of time, and the risk of ignition of the gas by an external ignition point can be reduced.

1 is a perspective view of a lead-acid battery according to Embodiment 1. FIG. Perspective view of the liquid spout (showing a state in which the lid member is closed) Perspective view of the liquid spout (showing a state in which the lid member is opened) AA line sectional view of FIG. Plan view of lid member Bottom view of lid member Perspective view of lid member Perspective view of filter BB line sectional view of FIG. Enlarged view of part of FIG. 4 (showing gas exhaust path) CC line sectional view of FIG. Horizontal sectional view of liquid spout Cross-sectional view showing another embodiment of the liquid port plug Cross-sectional view showing another embodiment of the liquid port plug

(Outline of this embodiment)
First, the outline of the storage battery plug of the present embodiment will be described.
The storage battery plug includes a plug body, a lid member, and a filter. The plug body has a cylindrical shape having a first outer peripheral wall on the top and a second outer peripheral wall having a diameter smaller than that of the first outer peripheral wall on the bottom.

The filter is located on the back surface of the lid member and outside the inner wall portion. At least one of the plug main body and the lid member has an exhaust portion for exhausting gas that has passed through the filter at a position corresponding to the gas outlet surface of the filter.

In this configuration, since the inner wall portion of the lid member closes the upper portion of the second outer peripheral wall, even if the electrolyte splashes inside the second outer peripheral wall due to vibration or the like, the splash of the electrolyte is confined by the inner wall. be able to. Moreover, since the filter is located outside the inner wall portion, it is difficult for electrolyte droplets to reach the filter. Therefore, leakage of the electrolytic solution can be suppressed.

In addition, the gas that has passed through the filter is directly exhausted from the exhaust part, and there is no space inside the plug where the gas that has passed through the filter stays. Therefore, compared with the conventional structure having a labyrinthine gas passage outside the inner wall (inner cylindrical portion), the gas that has passed through the filter can be exhausted outside the plug in a short time, and the inside of the plug due to the external ignition can be discharged in a short time. It is possible to reduce the risk of gas ignition in

The exhaust part may be provided on the first outer peripheral wall of the plug body. The gas can be discharged while avoiding the structure arranged on the top of the battery.

The exhaust part may be provided at a plurality of positions in the circumferential direction on the first outer peripheral wall of the plug body. Gas can be distributed and exhausted at multiple locations. The gas can be exhausted more smoothly than when the gas is exhausted intensively at one location. Therefore, it is difficult for the internal pressure of the plug to increase.

The filter may be ring-shaped. Assembly can be performed without worrying about the positional relationship with the exhaust part.

The lid member may have ribs surrounding the outer periphery of the inner wall portion on the outside of the inner wall portion. The filter may be located between the inner wall and the rib. With this configuration, the position of the filter can be regulated by the inner wall portion and the ribs.

The filter may have a gas inlet surface on the lower surface and a gas outlet surface on the outer peripheral surface. The rib has a first exhaust portion at a position corresponding to the outer peripheral surface of the filter, and the first outer peripheral wall of the plug body has a second exhaust portion at a position corresponding to the outer peripheral surface of the filter. may have. The first exhaust portion and the second exhaust portion may overlap at least partially in the circumferential direction and the thickness direction of the filter. With this configuration, the gas can be discharged while avoiding the structure arranged on the top of the battery.

<Embodiment>
An embodiment will be described with reference to FIGS. 1 to 12. FIG.
1. Structure of lead-acid battery and liquid spout plug The lead-acid battery 1 is, for example, a vented lead-acid battery (also referred to as an open lead-acid battery) mounted on a forklift or the like. As shown in FIG. , a negative electrode terminal 27B, and a liquid port plug 30 . The liquid port plug 30 corresponds to the "plug" of the present invention. In the following description, the width direction of the battery case 10 is the X direction, the depth direction of the battery case 10 is the Y direction, and the vertical direction of the battery case 10 is the Z direction.

The battery case 10 includes a battery case 11 and a lid member 21. The container 11 is made of synthetic resin, for example, and has a box shape with an open top. The battery case 11 accommodates an electrode plate group (corresponding to a power generation element) 15 and an electrolytic solution Q, as shown in FIG. Each electrode plate group 15 is composed of a positive electrode plate 15A, a negative electrode plate 15B, and a separator 15C that partitions the two

electrode plates

15A and 15B. .

The lid member 21 is made of resin and has a size capable of closing the container 11 . The lid member 21 closes the upper surface of the container 11 . After being attached to the container 11 , the lid member 21 is welded all around to the container 11 by thermal welding or the like.

On both sides of the cover member 21 in the X direction, a positive terminal 27A and a negative terminal 27B are provided as shown in FIG. The positive electrode terminal 27A and the negative electrode terminal 27B pass through the cover member 21 vertically, and are electrically connected to the positive and

negative electrode plates

15A and 15B housed in the battery case 11 via straps (not shown). there is

The vented lead-acid battery 1 generates gas G inside the battery case 10 due to charging and discharging reactions. The vented lead-acid battery 1 needs to compensate for the decrease in the electrolytic solution Q due to the exhaust of the gas G, and the cover member 21 is provided with a liquid injection port 25 for refilling with purified water.

The liquid port plug 30 is attached to the liquid injection port 25 and has the function of closing the liquid injection port 25 and the function of exhausting the gas G generated in the battery case 10 .

The structure of the liquid port plug 30 will be described in detail below with reference to FIGS. 2 to 12. FIG. Regarding the description of the liquid spout plug 30, regarding the front-rear direction, the operation end side of the lid member 80 (the left front side in FIG. 2) is the front side, and the fixing portion side of the lid member 80 (the right rear side in FIG. 2) is the rear side. side.

2 and 3 are perspective views of the liquid spout plug 30, and FIG. 4 is a sectional view of the liquid spout plug 30. FIG. The liquid spout plug 30 includes a plug body 40, a lid member 80, and a filter 100, as shown in FIGS.

The plug body 40 is made of synthetic resin, has a cylindrical shape with three steps in the vertical direction (Z direction), and has a first outer peripheral wall 41 , a second outer peripheral wall 51 and a third outer peripheral wall 61 .

The first outer peripheral wall 41, the second outer peripheral wall 51, and the third outer peripheral wall 61 are arranged in this order from the top. A third outer peripheral wall 61 is located.

The first outer peripheral wall 41, the second outer peripheral wall 51, and the third outer peripheral wall 61 have different outer diameters, and the outer diameter dimension is smaller in order of the third outer peripheral wall 61, the second outer peripheral wall 51, and the first outer peripheral wall 41. . That is, the outer diameter 61 of the third outer peripheral wall is the smallest, and the outer diameter of the first outer peripheral wall 41 is the largest.

The plug body 40 has an open top as shown in FIG. In the following description, the opening on the upper surface will be referred to as an upper surface opening 41A.

As shown in FIG. 4, the plug main body 40 is attached to the injection port 25 with the third outer peripheral wall 61 facing downward, and the first outer peripheral wall 41 is positioned on the upper surface of the lid member 21. The second outer peripheral wall 51 and the third outer peripheral wall 61 pass through the injection port 25 and are positioned inside the battery case 10 .

A screw-type engaging portion 53 provided on the outer peripheral surface of the second outer peripheral wall 51 is engaged with the back surface of the lid member 21 , so that the plug body 40 is attached to the lid member 21 of the battery case 10 . It has a structure that prevents it from coming off.

A ring-shaped packing 70 is attached to the upper portion of the second outer peripheral wall 51 . The packing 70 is, for example, a flat packing made of rubber and having a rectangular cross section.

As shown in FIG. 4 , the packing 70 functions to seal the gap between the liquid injection port 25 and the second outer peripheral wall 51 by being in close contact with the outer peripheral surface of the second outer peripheral wall 51 .

The third outer peripheral wall 61 of the plug body 40 has a tapered shape gently sloping downward. As shown in FIGS. 2 and 3, communication holes 65 and 66 are formed in the outer peripheral surface and the bottom wall of the third outer peripheral wall 61, respectively. The communication hole 65 serves to flow replenishment liquid (for example, purified water), which is replenished inside the plug body 40 as the electrolyte Q decreases, to the battery case 10 side.

A through hole 55 is formed in the outer peripheral surface of the second outer peripheral wall 51 of the plug body 40 . The through-holes 55 are shaped along the vertical direction, and are formed in plurality in the circumferential direction while avoiding the engaging portion 53 .

These through-holes 55 function to allow the gas G generated in the battery case 10 to pass through the internal space S of the plug body 40 as shown in FIG.

5 is a plan view of the lid member 80, FIG. 6 is a bottom view of the lid member 80, and FIG. 7 is a perspective view of the lid member 80. The lid member 80 is made of synthetic resin, and includes a lid body 81 , an inner cylindrical portion 85 and ribs 87 . The inner cylindrical portion 85 corresponds to the "inner wall portion" of the present invention.

The lid body 81 functions to close the upper opening 41A of the plug body 40, and is connected to the upper edge of the first outer peripheral wall 41 so as to be rotatable.

Specifically, as shown in FIG. 2, a horizontally extending hinge shaft 47 is provided at the upper edge of the rear outer peripheral surface of the first outer peripheral wall 41 . On the other hand, a pair of left and right connecting portions 82 having a C-shaped cross section are provided at the rear end portion of the lid body 81 .

The left and right connecting parts 82 are rotatably connected to the hinge shaft 47 . Therefore, by rotating around the hinge shaft 47, as shown in FIGS. The body 81 can be displaced.

The inner cylindrical portion 85 and the ribs 87 are located on the back surface of the lid body 81 and are integrally formed with the lid body 81 . The inner cylindrical portion 85 is cylindrical and protrudes downward from the back surface of the lid body 81 . As shown in FIG. 4 , the inner diameter dimension of the inner cylindrical portion 85 substantially matches the inner diameter dimension of the second outer peripheral wall 51 .

When the lid member 80 is closed, the inner tubular portion 85 is positioned above the second outer peripheral wall 51 and closes the upper portion of the second outer peripheral wall 51 .

By blocking the upper side of the second outer peripheral wall 51 with the inner cylindrical portion 85, even if the splashes of the electrolytic solution Q scatter in the internal space (inside the second outer peripheral wall 51) S of the plug body 40 due to vibration or the like, the splashes can be prevented. It can be confined in the inner cylindrical portion 85 .

The rib 87 is positioned outside the inner cylindrical portion 85 . The rib 87 surrounds the outer circumference of the inner tubular portion 85 . The rib 87 is ring-shaped and overlaps the inner peripheral surface of the first outer peripheral wall 41 of the plug body 40 without any gap. A protrusion 88 is formed on the outer peripheral surface of the rib 87 , and an engagement groove 43 is formed on the upper portion of the inner peripheral surface of the first outer peripheral wall 41 .

When the lid member 80 is closed, the protrusions 88 provided on the outer peripheral surface of the ribs 87 are engaged with the engagement grooves 43 of the first outer peripheral wall 41 , thereby locking the lid member 80 to the plug body 40 .

A circular operation edge 81A is provided on the tip side (free end side) of the lid body 81, and the lid member 80 can be unlocked by pushing up the operation edge 81A.

The filter 100 is made of a plastic sintered porous body made of water-repellent plastic such as polypropylene, porous ceramics such as alumina, or porous glass. The filter 100 has a large number of pores that make it more difficult for liquids to pass through compared to gases.

The filter 100 is ring-shaped (annular), as shown in FIG. As shown in FIGS. 9 and 10, the filter 100 is attached to the space between the inner cylindrical portion 85 and the rib 87 on the back surface of the lid body 81. As shown in FIGS. This embodiment is attached by press fitting. The filter 100 may be fixed by a method other than press-fitting.

As shown in FIG. 10 , when the lid member 80 is closed, the lower end 85A of the inner cylindrical portion 85 is separated from the upper surface 51A of the second outer peripheral wall 51 and is between the upper surface 51A of the second outer peripheral wall 51 and the lower end 85A. , are separated by a predetermined gap L0.

By providing a gap L0 between the second outer peripheral wall 51 and the inner cylindrical portion 85, when the internal pressure of the plug body 40 rises due to the gas generated in the battery case 10, the plug body 40 is displaced as shown in FIG. The gas G remaining in the internal space S of the exhaust chamber V passes through the gap L0.

The exhaust chamber V is a space whose ceiling wall is the lid body 81 and whose left and right walls are the first outer peripheral wall 41 of the plug body 40 and the inner peripheral cylinder 85 of the lid member 80 . In this embodiment, a filter 100 is arranged above the exhaust chamber V. As shown in FIG. The lower surface 100A of the filter 100 is a gas inlet surface 100A, and the gas that has reached the exhaust chamber V enters the inside of the filter 100 from the lower surface 100A of the filter 100. As shown in FIG. An outer peripheral surface 100B of the filter 100 is an outlet surface 100B of the gas G. As shown in FIG. 10, the gas G that has entered the inside of the filter 100 passes through the outer peripheral surface (gas outlet surface) 100B of the filter 100 and moves out of the filter.

The rib 87 of the lid member 80 has a first exhaust portion 89 as shown in FIG. The first exhaust portion 89 is formed above the protrusion 88 in the rib 87 . The first exhaust portion 89 has a hole shape elongated in the circumferential direction of the rib 87 . As shown in FIGS. 10 and 11, the first exhaust portion 89 corresponds to the outer peripheral surface (gas outlet surface) 100B of the filter 100, and substantially the entire first exhaust portion 89 covers the outer peripheral surface of the filter 100 ( 100B in the thickness direction of the filter 100 (vertical direction in FIG. 10).

Further, as shown in FIG. 3, the first outer peripheral wall 41 of the plug body 40 has a second exhaust portion 49. The second exhaust part 49 is formed in the upper edge of the first outer peripheral wall 41 and is a recessed groove elongated in the circumferential direction of the first outer peripheral wall 41 . Like the first exhaust part 89, the second exhaust part 49 is provided corresponding to the outer peripheral surface (gas outlet surface) 100B of the filter 100, and when the lid member 90 is closed, the second exhaust part 49 overlaps the outer peripheral surface (gas outlet surface) 100B of the filter 100 in the thickness direction of the filter 100 (vertical direction in FIG. 10). Further, as shown in FIGS. 10 and 12 , when the lid member 90 is closed, the second exhaust portion 49 is arranged in the circumferential direction and the thickness direction of the filter 100 with respect to the first exhaust portion 89 of the rib 87 . , almost all of them overlap each other. The first exhaust section 89 and the second exhaust section 49 correspond to the "exhaust section" of the present invention.

The gas G that has moved to the exhaust chamber V passes through the filter 100, as indicated by arrow F in FIG. It is exhausted to the outside of the liquid port plug 30 through the exhaust portion 49 .

The two

exhaust portions

89 and 49 are provided at a plurality of locations in the circumferential direction with respect to the rib 87 of the lid member 80 and the first outer peripheral wall 41 of the plug body 40 . In this embodiment, as shown in FIG. 12, it is provided at four locations in the circumferential direction, and the gas G generated in the container 10 can be dispersedly exhausted from the four locations in the circumferential direction.

2. Explanation of Effect (1) Suppression of Electrolyte Escaping Since the inner cylindrical portion 85 of the lid member 80 closes the upper side of the second outer peripheral wall 51, splashes of the electrolyte Q are prevented from being splashed into the internal space S (second Even if it scatters inside the outer peripheral wall 51 , the droplets of the electrolytic solution Q can be confined in the inner cylindrical portion 85 .

Moreover, since the exhaust chamber V for the gas G and the filter 100 are positioned outside the inner cylindrical portion 85, splashes of the electrolytic solution Q are unlikely to reach the exhaust chamber V and the filter 100. Therefore, leakage of the electrolytic solution Q can be suppressed.

(2) Reduction of the Risk of Gas Ignition in the Liquid Port Plug Since the filter 100 is provided inside the plug, even if there is an external fire point around the battery, the filter 100 can block the fire point.

In particular, the gas G that has passed through the filter 100 is directly discharged from the

exhaust parts

49 and 89 to the outside of the plug, and there is almost no space inside the liquid port plug in which the gas G that has passed through the filter 100 stays. . Therefore, the gas G that has passed through the filter 100 can be exhausted outside the plug in a short period of time compared to the conventional structure having a labyrinthine gas passage outside the inner cylindrical portion, and there is a risk of gas ignition due to an external ignition point. can be reduced.

(3) Effect of Distributed Exhaust The gas G can be exhausted more smoothly than when the gas G is exhausted centrally at one location. Therefore, the gas G is less likely to accumulate, and the internal pressure of the liquid port plug 30 is less likely to rise.

<Other embodiments>
The present invention is not limited to the embodiments explained by the above description and drawings, and the following embodiments are also included in the technical scope of the present invention.

(1) In the above embodiment, the present invention is applied to the liquid spout plug 30 for refilling water. may be

(2) In the above embodiment, the first exhaust section 89 and the second exhaust section 49 are provided at a plurality of locations, but the first exhaust section 89 and the second exhaust section 49 may be provided at only one location.

(3) In the above embodiment, the gas G is discharged horizontally (laterally) from the second exhaust portion 49 provided on the first outer peripheral wall 41 of the plug body 40 . As shown in FIG. 13A, the gas G may be exhausted upward from an exhaust portion 83 provided in the lid body 81 . In the case of FIG. 13A, the gas outlet surface is the upper surface 100C of the filter 100, and the exhaust portion 83 is provided in the lid body 81 so as to correspond to the upper surface 100C of the filter 100. In FIG.

(4) In the above embodiment, the rib 87 is provided on the back surface of the lid body 81 . Ribs 87 may be omitted, as shown in FIG. 13B.

(5) In the above embodiment, the filter 100 is ring-shaped. The filter 100 need only be positioned at least at a position overlapping the

exhaust portions

89 and 49, and does not necessarily have to be ring-shaped. Also, the filter 100 need not be one, and may be divided into a plurality of parts. That is, the filter 100 may be arcuate.

(6) In the above-described embodiment, the plug body 40 has a three-stage tubular shape consisting of the first outer peripheral wall 41 , the second outer peripheral wall 51 and the third outer peripheral wall 61 . The plug body 40 may have at least the first outer peripheral wall 41 and the second outer peripheral wall 51, and the third outer peripheral wall 61 may be omitted.

(7) In the above-described embodiment, the first exhaust portion 89 substantially entirely overlaps the outer peripheral surface (gas outlet surface) 100B of the filter 100 in the thickness direction of the filter 100 . A configuration may be adopted in which only a portion of the first exhaust section 89 overlaps the outer peripheral surface (gas outlet surface) 100B of the filter 100 in the thickness direction of the filter 100 (vertical direction in FIG. 10). The same applies to the second exhaust section 49 .

(8) In the above embodiment, when the lid member 90 is closed, substantially the entire second exhaust portion 49 is in the circumferential direction and the thickness direction of the filter 100 with respect to the first exhaust portion 89 of the rib 87. It has an overlapping form. The second exhaust portion 49 may partially overlap the first exhaust portion 89 in the circumferential direction and the thickness direction of the filter 100 . That is, the first exhaust portion 89 and the second exhaust portion 49 only need to have a portion where the two

exhaust portions

89 and 49 overlap each other corresponding to the outer peripheral surface 100B (gas outlet surface) of the filter 100 .

(9) In the above embodiment, the back surface of the lid member 80 is provided with the cylindrical portion 85 . Instead of the cylindrical portion 85, a cylindrical columnar portion or a prismatic prismatic portion may be provided. The cylindrical portion, columnar portion, and prismatic portion are examples of the "inner wall portion" of the present invention.

REFERENCE SIGNS LIST 1 lead-acid battery 10 battery case 21 lid member 25 liquid injection port 30 liquid port plug (stopper)
40 plug main body 41 first outer peripheral wall 49 second exhaust hole (exhaust portion)
51 second outer peripheral wall 61 third outer peripheral wall 80 lid member 81 lid main body 85 inner cylindrical portion (inner wall portion)
87 rib 89 first exhaust section (exhaust section)
100 filters

Claims

A plug for a storage battery,
a stopper body;
a lid member;
a filter and
The plug body is
A cylindrical shape having a first outer peripheral wall at the top and a second outer peripheral wall having a smaller diameter than the first outer peripheral wall at the bottom,
The lid member is
a lid body for opening and closing the upper opening of the plug body;
an inner wall portion formed on the back surface of the lid body,
The inner wall portion is positioned inside the first outer peripheral wall in relation to the first outer peripheral wall of the plug body, and is positioned above the second outer peripheral wall in relation to the second outer peripheral wall,
The filter is located on the back surface of the lid member and outside the inner cylindrical portion,
At least one of the plug main body and the lid member has an exhaust portion for exhausting gas that has passed through the filter at a position corresponding to a gas outlet surface of the filter.
The storage battery plug according to claim 1,
The storage battery plug, wherein the exhaust portion is provided on the first outer peripheral wall of the plug body.
The storage battery plug according to claim 2,
The storage battery plug, wherein the exhaust portions are provided at a plurality of locations in the circumferential direction on the first outer peripheral wall of the plug body.
The storage battery plug according to any one of claims 1 to 3,
The storage battery plug, wherein the filter is ring-shaped.
The storage battery plug according to any one of claims 1 to 4,
The lid member has a rib surrounding the outer periphery of the inner wall on the outside of the inner wall,
The plug for a storage battery, wherein the filter is positioned between the inner wall portion and the rib.
The storage battery plug according to claim 5,
The filter has a gas inlet surface on the lower surface and a gas outlet surface on the outer peripheral surface,
The rib has a first exhaust portion at a position corresponding to the outer peripheral surface of the filter,
the first outer peripheral wall of the plug body has a second exhaust portion at a position corresponding to the outer peripheral surface of the filter;
The storage battery plug, wherein the first exhaust portion and the second exhaust portion overlap at least partially in the circumferential direction and the thickness direction of the filter.
a battery case containing an electrolyte and a power generating element;
A storage battery comprising the storage battery plug according to any one of claims 1 to 6, which is attached to the battery case.