WO2024058126A1 - Gas exhaust apparatus for energy storage device - Google Patents

Abstract

The present invention provides a gas exhaust apparatus for an energy storage device, in which a cap member can be securely removed from a base member when a gas outlet of the energy storage device reaches or exceeds a predetermined value. The gas exhaust apparatus 10 for an energy storage device includes a base member 20, a cap member 60, and a seal member 80, the cap member 60 having a lid part 61, a pressing part 67, a pair of elastic pieces 69, 69, and a claw part 71, wherein the claw part 71 engages a mating part 41 with the elastic pieces 69 flexed outward, and a pair of first guide parts 51, 51 and a pair of second guide parts 53, 53 are provided on the circumference of a cylindrical part 21, the second guide parts 53 being located more radially inward of the cylindrical part 21 than the first guide parts 51 and further guiding the elastic pieces 69 guided by the first guide parts 51 when the cap member is mounted.

Description

Gas exhaust device for power storage devices

The present invention relates to a gas discharge device for a power storage device that discharges gas when the gas pressure at the gas discharge port of the power storage device is equal to or higher than a predetermined value.

For example, hybrid cars and electric cars use power storage devices such as batteries and capacitors. In the case of a battery such as a lithium ion battery, such an electricity storage device may generate gas due to a chemical reaction of the electrolyte. In this case, it is necessary to discharge gas from inside the power storage device to the outside of the power storage device.

For example, Patent Document 1 below describes a cap-shaped liquid injection port that has a cylindrical liquid injection port that protrudes upward from the battery inner lid, a circular plate-shaped ceiling plate, and a peripheral wall that hangs from its periphery. A sealed lead-acid battery is described, which has a cap valve that is detachably attached to the upper outer periphery of a liquid injection port.

The upper outer periphery of the liquid inlet is provided with a protrusion having a tapered outer surface and a horizontal locking surface formed on the lower end surface. Furthermore, a protrusion is provided on the inner periphery of the lower end of the peripheral wall of the cap valve, the outer surface of which has a tapered surface, and the upper end surface of which has a horizontal locking surface. Then, by covering the upper outer periphery of the liquid injection port with a cap valve, the locking surface of the protrusion on the liquid injection port side and the locking surface of the protrusion on the cap valve side are locked to each other, and the liquid injection port is A cap valve is attached to the mouth. Further, when the gas pressure inside the lead acid battery exceeds a predetermined value, the cap valve is removed from the liquid injection port, and the gas inside the lead acid battery is discharged.

Incidentally, in the case of the sealed lead-acid battery described in Patent Document 1, there are cases where it is desired to improve the sealing performance between the liquid injection port and the cap valve. In this case, for example, it is conceivable to arrange an annular seal ring between the locking surface of the protrusion on the liquid inlet side and the locking surface of the protrusion on the cap valve side. The seal ring arranged in this manner is pressed and deformed by both the locking surfaces on the liquid injection port side and the cap valve side, and seals the gap between the liquid injection port and the cap valve.

Japanese Patent Application Publication No. 8-315799

As shown in FIG. 1 of Patent Document 1, the cap valve in the sealed lead-acid battery is usually attached to the upper outer periphery of the liquid injection port so that its center is aligned with the center of the liquid injection port. However, the center of the cap valve may be attached to the upper outer periphery of the liquid inlet with its center being shifted from the center of the liquid inlet. In such a case, if a seal ring is placed between the locking surface of the protrusion on the liquid inlet side and the locking surface of the protrusion on the cap valve side, the seal ring will be pressed by both locking surfaces. The deformation of the seal ring becomes uneven. As a result, there are areas where the sealing pressure is high and areas where it is low, and gas leaks from the areas where the sealing pressure is low.Even if the gas pressure of the lead acid battery exceeds a specified value, there is a risk that the cap valve will not be removed from the injection port. there were.

Therefore, an object of the present invention is to provide a gas exhaust device for a power storage device that can reliably remove a cap member from a base member when the gas exhaust port of the power storage device reaches a predetermined value or more.

In order to achieve the above object, the present invention provides a gas discharge device for a power storage device that discharges gas when the gas pressure at the gas discharge port of the power storage device is equal to or higher than a predetermined value, the device being fixed to the gas discharge port. and a base member having a cylindrical part in which a passage communicating with the gas exhaust port is formed and an engaged part provided on the outer periphery of the cylindrical part, The cap member includes a cap member that is removably attached to a base member, and a seal member that is disposed between the base member and the cap member, and the cap member includes a lid portion and a seal member provided on the lid portion. A pressing part that presses the sealing member, a pair of elastic pieces extending from positions facing each other in the circumferential direction of the lid part, and a claw part formed on each elastic piece and engaging and disengaging from the engaged part. and when the claw portion engages the engaged portion with the pair of elastic pieces being bent outward and the gas pressure at the gas outlet is equal to or higher than a predetermined value, The claw portion is configured to be disengaged from the engaged portion and detached from the base member due to the pressure applied to the lid portion, and the sealing member is in a state where it is pressed by the pressing portion. are externally mounted on the cylindrical part to seal a gap between the base member and the cap member, and on the outer periphery of the cylindrical part are located on both sides of the elastic piece in the width direction, and the base a pair of first guide portions that guide the elastic piece when the cap member is attached to the member; and a pair of first guide portions that are located on both sides of the elastic piece in the width direction and that are closer to each other in the radial direction of the cylindrical portion than the pair of first guide portions. A pair of second guide parts are provided which are located inside and further guide the elastic piece guided by the first guide part during the mounting, and a gap between the pair of first guide parts is defined as L1. , where L2 is the gap between the pair of second guide parts and L3 is the length of the elastic piece in the width direction, L1>L2>L3.

According to the present invention, when the cap member is attached to the base member, the cap member is guided in opposing directions of the pair of elastic pieces by the pair of elastic pieces that engage with each other in an outwardly deformed state, and The elastic piece guided by the first guide part is further guided by the second guide part, so that the elastic piece is guided in a direction intersecting the opposing direction of the pair of elastic pieces. Therefore, since the center of the sealing member can be easily aligned with the center of the lid of the cap member, the pressing part provided on the lid will bite into the sealing member in an offset state, causing deformation of the sealing member. It is possible to suppress non-uniformity. As a result, when the gas pressure at the gas discharge port exceeds a predetermined value and the claw portion disengages from the engaged portion, the cap member can be reliably removed from the base member.

1 is an exploded perspective view showing one embodiment of a gas exhaust device for a power storage device according to the present invention. It is a perspective view of the state where each member of the gas exhaust device for electricity storage devices is assembled. FIG. 2 is a perspective view of a base member constituting the gas exhaust device for the electricity storage device, viewed from a direction different from that in FIG. 1 . FIG. 4 is an enlarged perspective view of the main part of FIG. 3; It is a front view of the base member which constitutes the gas discharge device for electricity storage devices concerning the present invention. 6 is an enlarged view of section A in FIG. 5. FIG. It is a side view of the base member which constitutes the gas discharge device for electricity storage devices concerning the present invention. 8 is an enlarged view of section B in FIG. 7. FIG. It is a longitudinal cross-sectional view of the gas exhaust device for the same electricity storage device. FIG. 10 is a longitudinal cross-sectional view in a direction different from FIG. 9 of the gas exhaust device for the electricity storage device. FIG. 11 is an explanatory longitudinal cross-sectional view of a state in which the cap member is removed from the base member in the state shown in FIG. 10; FIG. 3 is a cross-sectional view of the gas exhaust device for the electricity storage device. 13 is an enlarged view of section D in FIG. 12. FIG. (a) is an enlarged cross-sectional view of the main part when the pressing part of the cap member bites into the seal member without being deviated in the line EE of FIG. 12 is an enlarged cross-sectional view of the main part when the pressing part of the cap member bites into the seal member in a deviated state, (c) is a case where the second guide part is not present. FIG. It shows the process of attaching the cap member to the base member, in which (a) is an explanatory diagram of the state in which the claw part of the elastic piece is received in the receiving recess, and (b) is an explanatory diagram of the state in which the claw part is engaged with the engaged part. FIG. FIG. 2 is a perspective view for explaining the usage location of the gas exhaust device for a power storage device according to the present invention.

(One embodiment of a gas exhaust device for power storage device)
EMBODIMENT OF THE INVENTION Hereinafter, with reference to drawings, one embodiment of the gas exhaust device for electricity storage devices concerning this invention is described.

As shown in FIG. 16, this gas discharge device 10 for power storage device (hereinafter also simply referred to as "discharge device 10") has a gas pressure at a gas discharge port 6 (see FIGS. 9 to 11) of power storage device 1 at a predetermined value. This is for discharging the gas G at the above times.

In the case of this embodiment, a plurality of power storage devices 1 are arranged within the case 2. Here, two power storage devices 1 are arranged in each of the left and right regions within the case 2. Each power storage device 1 is attached with a connector 3 that communicates with its internal space. A pair of power storage devices 1, 1 disposed in the left and right regions within the case 2, respectively, are connected to a common gas exhaust tube 4 via connectors 3, 3.

Furthermore, the gas exhaust tubes 4 each extend outward from the case 2 via tube holding members 5 made of rubber, sponge, or the like. That is, gas exhaust tubes 4, 4 extend outward from the left and right side walls of the case 2.

As shown in FIGS. 9 to 11, a gas exhaust port 6 is provided at the distal end of each gas exhaust tube 4 in the extending direction. In this embodiment, the gas exhaust port 6 is arranged so that its opening faces downward. Further, a mounted member 7 having a mounting hole 7a is arranged at a position facing the gas discharge port 6, and the exhaust device 10 is mounted to the mounting hole 7a of the mounted member 7. (See Figures 9-11).

Examples of the above power storage device 1 include batteries (such as lithium ion batteries), capacitors, and capacitors used in hybrid vehicles including plug-in hybrid vehicles, electric vehicles, etc., but any device capable of storing power can be used. However, there are no particular limitations. Further, the shape and structure of the case, the shape and number of power storage devices arranged in the case, etc. are not particularly limited.

As shown in FIGS. 1, 2 and 9 to 11, the exhaust device 10 in this embodiment has a cylindrical portion that is fixed to the gas exhaust port 6 and has a passage 23 formed therein that communicates with the gas exhaust port 6. 21 and an engaged portion 41 provided on the outer periphery of the cylindrical portion 21; a cap member 60 that is removably attached to the base member 20 so as to close the outlet 23b of the passage 23; , a sealing member 80 disposed between the base member 20 and the cap member 60 to seal the gap therebetween.

The cap member 60 also includes a lid portion 61, a pressing portion 67 provided on the lid portion 61 to press the seal member 80, and a pair of elastic pieces 69 extending from positions facing each other in the circumferential direction of the lid portion 61. , 69, and a claw portion 71 formed on each elastic piece 69 and engaging and disengaging from the engaged portion 41.

Note that this cap member 60 is pushed toward the outlet 23b side of the passage 23 of the cylindrical portion 21 constituting the base member 20, and the claw portions 71, 71 of the pair of elastic pieces 69, 69 are inserted into the base member 20. By engaging the pair of engaged parts 41, 41, it is mounted on the base member 20 (see FIG. 10). At this time, the direction in which the cap member 60 is pushed into the base member 20 and the cap member 60 is mounted on the base member 20 is referred to as "the mounting direction F1 of the cap member 60" or "the cap member mounting direction F1". (See Figure 1).

Furthermore, as shown in FIGS. 9 and 10, the seal member 80 is externally mounted on the cylindrical portion 21 of the base member 20 while being pressed by the pressing portion 67 of the cap member 60, and the seal member 80 is attached to the cylindrical portion 21 of the base member 20. It is designed to seal the gaps between.

Furthermore, this ejection device 10 includes a seal washer 8 that is attached to the base member 20 and seals the gap between the attachment hole 7a of the attached member 7 and the base member 20.

The seal member 80 and seal washer 8 described above are annular and made of a porous material such as sponge, or an elastic material such as rubber or elastic elastomer. Furthermore, the seal member 80 may be compressed by being pressed from the axial direction by an external force or gas pressure, and its thickness may become thin, or it may be pressed from the inside in the radial direction and expand, or it may be compressed from the outside in the radial direction. It is possible to change the diameter, etc. Note that the seal member 80 has a smaller diameter than the seal washer 8.

Next, the detailed structure of the base member 20 will be described with reference to FIGS. 1, 3 to 11, etc.

As shown in FIGS. 9 to 11, the base member 20 of this embodiment has a cylindrical portion 21 having a generally cylindrical shape with a passage 23 formed therein. An annular flange portion 25 extends from the outer periphery of the cylindrical portion 21 midway in the axial direction. This flange portion 25 holds the seal washer 8 between the base member 20 and the attached member 7 when the base member 20 is attached to the attachment hole 7a of the attached member 7 (see FIGS. 9 to 11). Further, a portion on the proximal end side (one end side) of the cylindrical portion 21 in the extending direction forms a connecting portion 27, and a portion on the distal end side (other end side) in the extending direction of the cylindrical portion 21, It forms an insertion section 29.

In addition, in the following description, the distal end side of the cylindrical part 21 means the end side where the cap member 60 is arranged, and the proximal end side of the cylindrical part 21 refers to the side opposite to the distal end side. This means the end side where the gas exhaust port 6 is arranged.

Furthermore, by inserting the connecting portion 27 into the gas exhaust port 6 of the gas exhaust tube 4, the base member 20 is connected to and fixed to the gas exhaust port 6. On the other hand, the insertion portion 29 is a portion that is inserted into the mounting hole 7a of the mounted member 7 and is inserted from an opening on the back side of the mounting hole 7a (the side opposite to the front side that is the facing surface of the flange portion 25). It has become.

Further, the proximal opening of the passage 23 formed in the cylindrical part 21 on the side of the connecting part 27 serves as an inlet 23a for the gas G that is about to flow into the passage 23 via the gas exhaust tube 4. . Furthermore, the opening at the end of the passage 23 on the side of the insertion portion 29 serves as an outlet 23b for the gas G flowing out from inside the passage 23.

Furthermore, as shown in FIGS. 3 and 10, from the outer periphery of the insertion portion 29 on the proximal end side, a ring-shaped annular protrusion 31 is directed outward in the radial direction of the cylindrical portion 21. It is installed protrudingly.

Further, as shown in FIG. 3, a pair of thin plate-shaped guide walls 33, 33 arranged parallel to each other are connected to the cylindrical portion 21 from two circumferentially opposing locations of the annular protrusion 31. They each extend along the axial direction. That is, a total of four guide wall portions 33 are provided on the cylindrical portion 21, one pair each at positions facing each other in the circumferential direction of the annular protrusion 31 (see FIG. 5). Note that one end of each guide wall portion 33 in the extending direction is connected to the back side of the flange portion 25 (see FIG. 10).

Furthermore, as shown in FIG. 3, an arcuate sealing member retaining wall 35 is formed from the outer peripheral edge of the annular protrusion 31 other than the portion where the pair of guide walls 33, 33 are provided. , extending along the axial direction of the cylindrical portion 21.

As shown in FIG. 9, a seal member mounting groove 37 having a substantially annular groove shape is provided between the annular protrusion 31, the seal member retaining wall 35, and the distal end portion of the insertion portion 29 of the cylindrical portion 21. is starting to form. A seal member 80 is inserted and held in this seal member mounting groove 37 and is mounted on the outer periphery of the cylindrical portion 21 (sheathed on the outside). Furthermore, the seal member retaining wall 35 restricts the seal member 80 from expanding outward in the radial direction.

Furthermore, as shown in FIG. 3, a sealing member holding protrusion 39 is provided on the outer periphery of the most distal end of the insertion portion 29 of the cylindrical portion 21 and between the pair of guide walls 33, 33. . In this embodiment, a pair of seal member holding protrusions 39, 39 are provided at two circumferentially opposing locations on the cylindrical portion 21 (see FIG. 5). These pair of seal member holding protrusions 39, 39 hold the seal member 80 mounted in the seal member mounting groove 37 so as not to come off (see FIG. 10).

Further, the outer peripheral edge of the annular protrusion 31 between the pair of guide walls 33 forms an engaged portion 41 (see FIG. 3). In this embodiment, a pair of engaged parts 41, 41 are provided at two circumferentially opposing locations on the annular protrusion 31.

Furthermore, as shown in FIGS. 8 and 10, the surface of each engaged portion 41 that is close to the flange portion 25 (the surface on the cap member mounting direction F1 side) forms an engaged surface 42. As shown in the partially enlarged view of FIG. 10, the engaged surface 42 includes a flat horizontal surface 42a (a surface perpendicular to the axis of the base member 20) and a radially outer side thereof. The curved surface 42b has a curved surface shape.

As shown in FIG. 10, the claws 71, 71 of the pair of elastic pieces 69, 69 of the cap member 60 engage with the engaged surfaces 42, 42 of the pair of engaged parts 41, 41. It has become.

Further, as shown in FIGS. 4 and 6, a surface 43 of the engaged portion 41 facing the inner periphery of the elastic piece 69 (hereinafter also simply referred to as "opposing surface 43") has a top portion 43a and a top portion 43a. It has a curved surface 43b that gradually becomes lower in a direction away from each other in the circumferential direction of the cylindrical portion 21 from 43a.

More specifically, the opposing surface 43 of the engaged portion 41 includes an arcuate rounded top portion 43a arranged at the circumferential center of the engaged portion 41, and a cylindrical shape formed from the top portion 43a. It has curved surfaces 43b, 43b which are convex curved surfaces that gradually become lower in the direction away from each other in the circumferential direction of the portion 21, here, toward both sides in the width direction of the engaged portion 41 (see FIG. 4).

Further, as shown in FIG. 3, a thin plate-shaped overhanging piece 44 overhangs radially outward from the outer periphery of the annular protrusion 31, and on the outer peripheral edge of this overhanging piece 44, An outer peripheral wall portion 45 extends in the axial direction of the cylindrical portion 21 . The outer peripheral wall portion 45 has an arcuate portion 45a having an arcuate shape that matches the outer peripheral shape of the annular protrusion 31, and flat portions 45b, 45b which are parallel to each other and have a flat surface shape. Further, the outer peripheral wall portion 45 is cut out at a portion where the pair of engaged portions 41, 41 are located (see FIG. 5), and the pair of elastic pieces 69, 69 of the cap member 60 are cut out at the portion where the pair of engaged portions 41, 41 are located. It is possible to enter between the parts 33 and 33.

Further, as shown in FIGS. 3 and 7, from the outer surface of the tip portions of the pair of flat portions 45b, 45b of the outer peripheral wall portion 45, a pair of engagement portions that can be flexibly deformed are formed obliquely outward toward the flange portion 25. Pieces 47, 47 extend. These pair of engaging pieces 47, 47 are arranged perpendicularly to the pair of engaged parts 41, 41 when the cylindrical part 21 is viewed from the axial direction (see FIG. 5). Further, as shown in FIG. 7, an engagement surface 47a having a tapered shape is formed on the outer surface of the distal end portion of each engagement piece 47 in the extending direction.

As shown in FIG. 9, the engagement surface 47a of each engagement piece 47 engages with the back side periphery of the attachment hole 7a of the attached member 7, so that The base member 20 is fixed to the attachment hole 7a, and the entire discharge device 10 is attached to the attachment member 7.

Further, as shown in FIGS. 3 to 8, the outer periphery of the cylindrical portion 21 is located on both sides of the elastic piece 69 of the cap member 60 in the width direction, and serves as a guide when the cap member 60 is attached to the base member 20. It is located on both sides in the width direction of the pair of first guide parts 51, 51 and the elastic piece 69, and is located inside the cylindrical part 21 in the radial direction than the pair of first guide parts 51, 51, and is connected to the base member 20. A pair of second guide parts 53, 53 are provided to further guide the elastic piece 69 guided by the pair of first guide parts 51, 51 when the cap member 60 is attached.

Note that the width direction of the elastic piece 69 is perpendicular to the direction in which the elastic piece 69 bends and deforms (see arrow T in FIG. 10), and the width direction of the elastic piece 69 is perpendicular to the direction in which the elastic piece 69 bends and deforms (see arrow T in FIG. 10). means the direction along the circumferential direction of the peripheral wall 65, which will be described later.

As shown in FIGS. 4 and 8, the inner surface of the proximal end 33a (the end close to the seal member holding wall 35) of the pair of guide walls 33, 33 in the protruding direction A pair of rib- like protrusions 49, 49 are provided in a protruding manner at a location opposite to the cap member mounting direction F1.

As shown in FIGS. 4 and 6, when the cylindrical portion 21 is viewed from the axial direction, the surfaces of the pair of rib- like protrusions 49, 49 on the tip side separated from the cylindrical portion 21, in other words, The surfaces of the pair of rib- like protrusions 49, 49 facing toward the tip end in the direction in which the guide wall 33 protrudes form the pair of first guide portions 51, 51. Further, the pair of first guide portions 51, 51 have tapered surfaces that gradually become narrower toward the inside of the cylindrical portion 21 in the radial direction.

Furthermore, as shown in FIGS. 4 and 6, when the cylindrical portion 21 is viewed from the axial direction, the surfaces of the pair of rib- like protrusions 49, 49 on the proximal end side close to the cylindrical portion 21, in other words The surfaces of the pair of rib- like protrusions 49, 49 that are located radially inward of the cylindrical portion 21 than the tapered surfaces forming the first guide portions 51, 51 and that face each other are The second guide portions 53, 53 are formed.

That is, the pair of second guide parts 53, 53 are provided at locations closer to the radially inner side of the cylindrical part 21 than the pair of first guide parts 51, 51. Further, the pair of second guide portions 53, 53 have flat surfaces parallel to each other. Further, the tip (upper end) of the second guide portion 53 is formed continuously with the base end (lower end) of the first guide portion 51 via an R-shaped boundary portion 53a, so to speak. It can also be said that the second guide section 53 is provided at a position one step lower than the first guide section 51 via the boundary section 53a.

Further, FIG. 13 shows the relationship among the first guide part 51, the second guide part 53, and the elastic piece 69. That is, the gap between the pair of first guide parts 51, 51 (the maximum gap between the pair of first guide parts 51, 51) is L1, and the gap between the pair of second guide parts 53, 53 (the maximum gap between the pair of second guide parts 51, 51) is L1. When L2 is the minimum gap between the guide portions 53 and 53, and L3 is the length of the elastic piece 69 in the width direction, the setting is such that L1>L2>L3.

FIG. 6 shows a state in which the elastic piece 69 is displaced in the circumferential direction of the cylindrical portion 21 with respect to the engaged portion 41 when the cap member 60 is attached to the base member 20 (double-dashed line (See elastic piece 69' shown in .). Even in such a state, the pair of first guide portions 51, 51 and the pair of second guide portions 53, 53 correct the positional deviation of the elastic piece 69, and the engaged portion 41 is placed in the predetermined position. The claw portion 71 is adapted to engage. Note that details of the process of guiding the elastic piece 69 by the first guide part 51 and the second guide part 53 will be described later.

Further, the engaged portion 41 will be further explained in relation to the first guide portion 51 and the second guide portion 53. That is, in this embodiment, the claw portion 71 of the elastic piece 69 guided by the second guide portion 53 is received in the portion of the engaged portion 41 opposite to the mounting direction F1 of the cap member 60 with respect to the base member 20. (See FIG. 15(a)), a receiving recess 55 is provided.

More specifically, as shown in FIG. 4, on the opposite side of the engaged portion 41 from the mounting direction F1 of the cap member 60 with respect to the base member 20, a pair of rib- like protrusions 49, 49 are provided. A receiving recess 55 is provided in a portion between the second guide portions 53, 53, which is open at the upper side (the direction facing outward in the radial direction of the cylindrical portion 21) and at one side.

As shown in FIG. 6, the receiving recess 55 has a flat bottom surface 55a, and the receiving recess 55 has rounded corner portions 55b, 55b on both sides of the bottom surface 55a in the width direction. A pair of second guide parts 53, 53 are arranged. That is, the pair of second guide portions 53, 53 serve as inner surfaces of the receiving recess 55 in the width direction.

Furthermore, as shown in FIG. 8, when the cylindrical portion 21 is viewed from the radial direction, the outer surfaces 57, 57 of the pair of rib- like protrusions 49, 49 on the cap member mounting direction F1 side are aligned in the cap member mounting direction F1. It has a tapered surface that gradually expands toward the sides.

Next, the detailed structure of the cap member 60 that is detachably attached to the base member 20 will be described with reference to FIGS. 1, 9, 10, etc.

As described above, the cap member 60 of this embodiment includes a lid portion 61, a pressing portion 67, a pair of elastic pieces 69, 69, and a claw portion 71 formed on each elastic piece 69. .

Further, the lid portion 61 in this embodiment is composed of a bottom wall 63 having a substantially circular plate shape, and a peripheral wall 65 having a substantially cylindrical wall shape and standing upright from the outer peripheral edge of the bottom wall 63. . Note that, as shown in FIG. 10, the bottom wall 63 constituting the lid portion 61 is disposed opposite to the outlet 23b of the passage 23, and serves as a portion for receiving gas G flowing out from the outlet 23b of the passage 23. It can also be said that this is the part on which the pressure of the gas G at the gas discharge port 6 acts.

Further, in the cap member 60, the claw portions 71, 71 of each elastic piece 69 engage with the pair of engaged portions 41, 41, respectively, with the pair of elastic pieces 69, 69 being bent and deformed outward. , when the gas pressure at the gas discharge port 6 is equal to or higher than a predetermined value, each claw part 71 is disengaged from the engaged part 41 and detached from the base member 20 due to the pressure applied to the lid part 61. has been done.

Further, from the inner circumferential edge of the distal end surface 65a of the peripheral wall 65 of the lid part 61 in the upright direction, a pressing part 67 in the shape of an annular protrusion protrudes. This pressing portion 67 can be inserted into the sealing member mounting groove 37 of the base member 20 when the cap member 60 is mounted on the base member 20 (see FIG. 9).

When the cap member 60 is pushed into the base member 20 in the cap member mounting direction F1 and the cap member 60 is mounted on the base member 20, the pressing portion 67 is mounted in the seal member mounting groove 37. The seal member 80 is pressed from the axial direction. As a result, the seal member 80 is compressed and deformed to expand radially outward, but this expansion is regulated by the seal member retaining wall 35 (see FIG. 9). ).

Furthermore, a pair of elastic pieces 69, 69 extend from the outer peripheral edge of the lid portion 61 at two radially opposite locations. Each elastic piece 69 is a strip-like piece whose base end (fixed end) is connected to the inner peripheral edge of the distal end surface 65a of the peripheral wall 65 constituting the lid section 61, and extends beyond the distal end of the pressing section 67. It becomes.

Further, each elastic piece 69 has a free end at its tip in the extending direction, and can be bent inward or outward of the cap member 60 as shown by arrow T in FIG. 10. There is. Further, the width of each elastic piece 69 along the circumferential direction is narrower than the interval between the pair of guide walls 33, 33 of the base member 20, so that when the cap member 60 is attached to the base member 20, It is possible to enter between the guide wall portions 33, 33 of.

Furthermore, a claw portion 71 is provided protruding from the inner periphery of the tip end of each elastic piece 69 in the extending direction. Referring also to the partially enlarged view of FIG. 10, this claw portion 71 has a top portion 72 that most protrudes from the inner circumferential surface of the elastic piece 69, and a side F1 in the attachment direction of the cap member 60 (a side away from the lid portion 61). A tapered surface 73 is formed on the outer surface of the cap member and has an inclined surface shape that gradually reduces the amount of protrusion from the top portion 72 toward the distal end side in the extending direction of the elastic piece 69. The engaging surface 74 is formed on the outer surface (the side opposite to the mounting direction F1) and has an inclined surface shape that gradually reduces the amount of protrusion from the top portion 72 toward the proximal end side in the direction in which the elastic piece 69 extends. have.

Further, the claw portion 71 is formed over the entire circumferential direction (width direction) of the elastic piece 69 (see FIG. 1). Therefore, when the first guide part 51 and the second guide part 53 guide the elastic piece 69, the claw part 71 mainly comes into contact with the first guide part 51 and the second guide part 53.

Next, the process of attaching the cap member 60 having the above structure to the base member 20 will be described together with the process of guiding the elastic piece 69 by the first guide part 51 and the second guide part 53.

First, as shown in FIG. Align. Thereafter, the cap member 60 is pushed into the base member 20 in the cap member mounting direction F1 of FIG.

At this time, as shown in FIG. 13, it is desirable that the elastic piece 69 be in a position where it can be inserted between the pair of second guide parts 53, 53. The position is often shifted in one direction (see the elastic piece 69' indicated by the two-dot chain line in FIG. 6). In this case, the claw portion 71 will not engage with the predetermined position of the engaged portion 41.

Even in the above case, in the ejection device 10 of the present invention, the displacement of the elastic piece 69 in the circumferential direction of the cylindrical part 21 is corrected, and the claw part is placed in a predetermined position of the engaged part 41. 71 can be engaged.

That is, as described above, when the cap member 60 is pushed into the base member 20 with the elastic piece 69 displaced in one direction in the circumferential direction of the cylindrical portion 21 (the elastic piece 69' shown by the two-dot chain line) ), a claw part 71 provided at the tip of the elastic piece 69 and formed over the entire widthwise area of the elastic piece 69 hits one first guide part 51 (on one side in the width direction of the claw part 71 (the first guide portion 51 comes into contact with one of the first guide portions 51).

Then, the claw portion 71 is pressed by one of the first guide portions 51, and the elastic piece 69 is spread and deformed outward of the cap member 60. As shown in FIG. An elastic restoring force F2 acts inward in the radial direction of the cylindrical portion 21, but this elastic restoring force F2 is applied in the lateral direction (perpendicular to the elastic restoring force F2) by one first guide portion 51 having a tapered surface shape. direction) is converted into force F3.

As a result, the elastic piece 69 is guided by one of the first guide parts 51 to move in the circumferential direction (lateral displacement movement) toward the other first guide part 51, so that the cylindrical part of the elastic piece 69 21 in the circumferential direction is corrected, and as a result, the positional deviation of the claw portion 71 with respect to the engaged portion 41 is also corrected.

Furthermore, the elastic piece 69 whose positional deviation has been corrected by the first guide part 51 enters (falls down) between the pair of second guide parts 53 and 53 due to its elastic restoring force F2. At this time, if the elastic piece 69 is displaced in one direction in the circumferential direction of the cylindrical portion 21 , for example, one widthwise side portion of the claw portion 71 comes into contact with one of the second guide portions 53 . Then, the claw part 71 is pressed by one of the second guide parts 53, and the elastic piece 69 is guided to move in the circumferential direction toward the other second guide part 53, while the pair of second guide parts 53 , 53 (elastic piece 69'' shown by the two-dot chain line in FIG. 6). As a result, the displacement of the elastic piece 69 in the circumferential direction of the cylindrical portion 21 is further corrected, and the displacement of the claw portion 71 with respect to the engaged portion 41 is also further corrected.

In this way, in this ejecting device 10, the positional deviation of the elastic piece 69 in the circumferential direction of the cylindrical part 21 is corrected by the two guide parts, the first guide part 51 and the second guide part 53. It is configured.

Further, as shown in FIG. 6, the second guide part 53 has a flat surface shape, and is provided at a position one step lower than the first guide part 51 via a boundary part 53a. Therefore, the difference in the inclination angle with respect to the line segment L along the arrangement direction of the pair of guide walls 33, 33 is clear. Therefore, the widthwise corner 69a of the elastic piece 69 guided by the first guide part 51 (the lower corner of the elastic piece 69'' in FIG. 6) is securely attached to the second guide part 53. It has a structure that makes contact.

As shown in FIG. 14C, suppose that the second guide part 53 does not exist and the first guide part 51 is connected to the bottom surface 55a of the receiving recess 55 via the plurality of rounded parts 51a and 51b. In such a structure, it becomes difficult to guide the corner portion 69a of the elastic piece 69 in the width direction (because the corner portion 69a of the elastic piece 69 is located in the rounded portion 51a of the first guide portion 51, it becomes difficult to guide the corner portion 69a of the elastic piece 69 in the width direction. (hard to do).

Further, when the elastic piece 69 enters between the pair of second guide parts 53, 53, the top part 72 of the claw part 71 fits into the receiving recess 55 provided in the engaged part 41, as shown in FIG. 15(a). It will be accepted by.

When the cap member 60 is further pushed into the base member 20 from this state, the top part 72 of the claw part 71 comes out of the receiving recess 55, and the top part 72 becomes the top part 43a of the opposing surface 43 of the engaged part 41. sliding into contact with each other. Then, when the claw portion 71 climbs over the engaged portion 41 and the engaging surface 74 reaches the engaged surface 42, the elastic piece 69 elastically returns, and as shown in FIG. 15(b), the claw portion The engaging surface 74 of 71 engages with the engaged surface 42 of the engaged portion 41 .

As a result, as shown in FIG. 10, the cap member 60 is attached to the base member 20 via the pair of elastic pieces 69, 69 and their claws 71, 71. In this state, the engaged surface 42 of the base member 20 and the claw portion 71 of the cap member 60 are arranged diagonally.

In this embodiment, the claw portion 71 is provided with an engaging surface 74 having an inclined surface shape, and this engaging surface 74 is engaged with the engaged surface 42 of the base member 20 including the curved surface 42b. In this case, the engaging force of the cap member 60 with respect to the base member 20 is lower than that in the case where both the engaging surface of the claw part and the engaged part are horizontal planes and they engage with each other. Therefore, when the gas pressure at the gas discharge port 6 becomes a predetermined value or more, and the gas G flowing into the passage 23 from the inlet 23a of the base member 20 and flowing out from the outlet 23b also becomes a predetermined value or more, the gas G will pressurize the base member 20. The pair of elastic pieces 69, 69 are bent and deformed outward through the lid part 61 of the cap member 60, and the engagement of the claw part 71 with the engaged surface 42 of the base member 20 is released. The cap member 60 is configured to be detachable from the member 20.

Note that, as described above, when the top portion 72 of the claw portion 71 goes over the engaged portion 41 and returns elastically, each elastic piece 69 completely maintains the state in which the cap member 60 is not bent outwardly. Rather than returning, the claw portion 71 engages with the engaged surface 42 while maintaining the state in which the cap member 60 is slightly bent outward.

(Modified example)
In the embodiments described above, the shapes, structures, layouts, etc. of the electricity storage device, the case, the gas exhaust tube, the tube holding member, the gas exhaust port, etc. are not limited to the above embodiments. For example, in this embodiment, two power storage devices 1 form a set, but three or more power storage devices may be used as a set via connectors or tubes. Moreover, although the gas discharge port 6 is a downward opening, it may also be a horizontal opening.

Further, the shapes and structures of the base member, cap member, seal member, seal washer, etc. that constitute the gas exhaust device for an electricity storage device are not limited to the above embodiments.

For example, the base member 20 has a cylindrical portion 21 that has a connecting portion 27 and an insertion portion 29 and has a generally cylindrical shape as a whole. Alternatively, it may have a substantially elliptical cylindrical shape, as long as it is fixed to the gas exhaust port and has a passage therein that communicates with the gas exhaust port. In addition, the base member 20 of this embodiment is such that its connecting portion 27 is inserted into the gas exhaust port 6 of the gas exhaust tube 4 and fixed therein. The base member may be fixed to the gas outlet.

In addition, the base member 20 in this embodiment has a pair of anchor-shaped engagement pieces 47, 47, but for example, an engagement protrusion may be provided on the outer periphery of the base member, and this engagement protrusion may be engaged with a mounting hole in the member to be attached, and there is no particular limitation on the mounting structure of the base member relative to the mounting hole.

Furthermore, the pair of first guide parts 51, 51 of this embodiment have tapered surfaces that gradually become narrower toward the radial inward side of the cylindrical part 21. The guide portion may be a curved surface, a plurality of sloped surfaces, a combination of a curved surface and a sloped surface, etc., and can correct the circumferential positional deviation of the elastic piece, and can also be used to connect the elastic piece to the second guide portion. It would be good if it could be guided to.

Further, the pair of second guide portions 53, 53 in this embodiment have a flat surface shape parallel to each other, but for example, the second guide portions 53, 53 are inclined so that the width becomes gradually narrower toward the inside in the radial direction of the cylindrical portion. It may be a tapered surface or may have any shape as long as it can guide the elastic piece in a manner that corrects the circumferential positional deviation.

Further, in the cap member 60 of this embodiment, the bottom wall 63 of the lid portion 61 also has a substantially circular plate shape, corresponding to the insertion portion 29 of the substantially cylindrical cylindrical portion 21 of the base member 20. However, for example, the lid part may have a substantially rectangular plate shape, a substantially elliptical plate shape, etc., and can cover the outlet of the passage of the base member and catch the gas flowing out from the outlet. Good to have.

Also, in this embodiment. A claw portion 71 is provided protrudingly on the inner periphery of the tip of the elastic piece 69, but the claw portion may be provided midway in the extending direction of the elastic piece, and may be provided as long as it can engage with the engaged portion. Bye. Furthermore, although the claw portion 71 in this embodiment is formed over the entire width of the elastic piece 69, it may be formed narrower or wider than the elastic piece 69.

Further, although both the seal member 80 and the seal washer 8 have an annular shape, these may be, for example, in the shape of a square ring or an elliptical ring, and can be changed as appropriate depending on the shape and structure of the base member.

Furthermore, the lid part 61 of the cap member 60 has a function of receiving the pressure of the gas G, but this lid part does not allow moisture to pass through, but allows a predetermined flow rate of gas such as gas to pass through. It may also have a function.

(effect)
Next, the effects of the discharge device 10 according to the present invention having the above configuration will be explained.

First, the assembly process of the ejection device 10 will be explained.

That is, by inserting the seal member 80 into the seal member mounting groove 37 of the base member 20, the seal member 80 is held in place by the seal member holding protrusion 39 (see FIG. 10), and the cylindrical shape of the base member 20 is held. A sealing member 80 is externally mounted on the portion 21 .

Then, as shown in FIG. 1, one elastic piece 69 is aligned between one of the guide walls 33, 33, and the other elastic piece 69 is positioned between the other guide wall parts 33, 33. After alignment, the cap member 60 is pushed into the base member 20.

Then, the claw portion 71 is pressed by one of the first guide portions 51, and the elastic piece 69 is pushed out and deformed outwardly of the cap member 60, and the first guide portion 51 causes the elastic piece 69 to The positional deviation of the cylindrical portion 21 in the circumferential direction is corrected. Thereafter, the elastic piece 69 enters between the pair of second guide parts 53, 53, and the second guide part 53 further corrects the displacement of the elastic piece 69 in the circumferential direction of the cylindrical part 21.

That is, the two guide parts, the first guide part 51 and the second guide part 53, correct the positional deviation of the elastic piece 69 in the circumferential direction of the cylindrical part 21, and the position of the claw part 71 relative to the engaged part 41 is corrected. Misalignment is corrected. Further, as shown in FIG. 15(a), the top portion 72 of the claw portion 71 is received in the receiving recess 55 provided in the engaged portion 41.

When the cap member 60 is further pushed into the base member 20, the top part 72 of the claw part 71 comes out of the receiving recess 55, and the top part 72 comes into sliding contact with the top part 43a of the opposing surface 43 of the engaged part 41, When the claw portion 71 climbs over the engaged portion 41, the elastic piece 69 elastically returns, and the engaging surface 74 of the claw portion 71 engages with the engaged surface 42 of the engaged portion 41 (Fig. 15 (see (b)).

As a result, the cap member 60 is attached to the base member 20 with the seal member 80 interposed between the base member 20 and the cap member 60 via the pair of elastic pieces 69, 69 and their claws 71, 71. Can be installed. Further, the sealing member 80 is pressed by the pressing portion 67 of the cap member 60 and becomes crushed within the sealing member mounting groove 37 (see FIG. 9).

Thereafter, the seal washer 8 is placed on the back side of the flange portion 25 of the base member 20, and the insertion portion 29 of the base member 20 is inserted through the opening on the front side of the attachment hole 7a of the attached member 7. Then, the pair of engagement pieces 47, 47 are pressed by the inner periphery of the attachment hole 7a and are bent and deformed inwardly, and the engagement surface 47a of the engagement piece 47 comes out from the back opening of the attachment hole 7a. Then, the pair of engaging pieces 47, 47 elastically return, and their engaging surfaces 47a, 47a engage with the back side periphery of the attachment hole 7a, allowing the ejection device 10 to be attached to the attachment hole 7a (FIG. 9). reference). In this state, the seal washer 8 is held between the flange portion 25 of the base member 20 and the front side periphery of the attachment hole 7a of the attached member 7, ensuring watertightness.

When gas G is generated in the power storage device 1 due to power supply to the drive source and electrical components by the power storage device 1, or due to the external environment or internal environment of the power storage device 1, etc. (for example, if the power storage device such as a lithium ion battery , when power is supplied by driving a motor etc., gas is generated due to the chemical reaction of the electrolyte), gas G flows through the connector 3 and gas exhaust tube 4 and reaches the gas exhaust port 6; When the gas pressure at is equal to or higher than a predetermined value, the cap member 60 is removed from the base member 20.

That is, the gas G flows into the passage 23 from the inlet 23a of the base member 20, flows through the passage 23, flows out from the outlet 23b, and presses the lid part 61 of the cap member 60, but the gas G does not discharge gas. When the gas pressure at the outlet 6 becomes a predetermined value or more, the pressure of the gas G (see FIG. 10) acting on the lid portion 61 of the cap member 60 also becomes a predetermined value or more. Then, since the lid part 61 of the cap member 60 is pressed by the gas G, the engaging surface 74 of the claw part 71 is pressed by the curved surface 42b of the engaged surface 42 of the engaged part 41, and the claw part 71 The elastic piece 69 is bent and deformed outward from the cap member 60 via the cap member 60 .

As a result, the engaging surface 74 of the claw portion 71 comes off from the horizontal surface 42a and curved surface 42b of the engaged surface 42, and the engagement between the engaged surface 42 and the claw portion 71 is released. As shown, the cap member 60 can be removed from the base member 20.

According to this ejection device 10, the pair of elastic pieces 69, 69 are bent outward so that the claw parts 71, 71 engage with the pair of engaged parts 41, 41. It has become. Therefore, when the cap member 60 is attached to the base member 20, the cap member 60 is moved in the opposite direction by the pair of elastic pieces 69, 69 that are engaged in an outwardly deformed state. is guided. That is, by utilizing the elastic return force of the pair of elastic pieces 69, 69, the claw parts 71, 71 are respectively attached to the pair of engaged parts 41, 41 in the direction opposite to the radial direction of the cylindrical part 21. They can be firmly engaged (for example, it is possible to prevent a situation in which only the claw portion 71 of one elastic piece 69 engages with one of the engaged portions 41).

Furthermore, the elastic piece 69 guided by the first guide part 51 is further guided by the second guide part 53, thereby being guided in a direction intersecting the opposing direction of the pair of elastic pieces 69, 69. That is, when the cap member 60 is attached to the base member 20, the elastic piece 69 guided by the first guide part 51 is further guided by the second guide part 53, so that the elastic piece 69 is , it is possible to reliably correct the positional deviation of the cylindrical portion 21 in the circumferential direction and engage the claw portion 71 in a predetermined position of the engaged portion 41 .

From the above, as shown in FIG. 12, it is possible to easily align the center C2 of the sealing member 80 with the center C1 of the lid 61 of the cap member 60. 67 can be prevented from biting into the seal member 80 in a deviated state and causing uneven deformation of the seal member 80. As a result, when the gas pressure at the gas discharge port 6 exceeds a predetermined value and the claw portion 71 disengages from the engaged portion 41, the cap member 60 is reliably removed from the base member 20. can do.

The above effects will be explained with reference to FIGS. 14(a) and (b).

As shown in FIG. 14(b), the pressing portion 67 of the lid portion 61 is deviated inward in the radial direction with respect to the sealing member 80 (the pressing portion 67 indicated by the two-dot chain line is If the sealing member 80 bites in with the position shifted in the direction shown by the arrow, the deformation of the sealing member 80 becomes uneven. Moreover, although the hooking allowance S1 of the seal member 80 on the radial outer peripheral edge of the pressing portion 67 of the cap member 60 (the upper portion in FIG. 14(b)) is large, the radial inner peripheral edge of the pressing portion 67 ( 14(b)), the hooking allowance S2 of the seal member 80 is reduced. In this case, the cap member 60 is easily detached from the base member 20 from the portion where the seal member 80 has a small hooking allowance S2, and when the gas pressure at the gas discharge port 6 exceeds a predetermined value, the cap member 60 is removed from the base member 20. There is a risk that it may come off.

On the other hand, in the case of the present invention, the center C2 of the sealing member 80 can be easily aligned with the center C1 of the lid part 61 of the cap member 60, and the pressing part 67 is in a state deviated toward the sealing member 80. It is regulated to bite into it.

Therefore, the deformation of the seal member 80 becomes uniform, and as shown in FIG. 14(a), the seal member 80 The hooking distance S1 of the seal member 80 and the hooking margin S2 of the seal member 80 with respect to the radially inner circumferential edge portion of the pressing portion 67 (lower portion in FIG. 14(a)) are almost the same. As a result, it is possible to prevent the seal member 80 from coming off from the base member 20 before the gas pressure at the gas outlet 6 reaches a predetermined value or more, and the gas pressure at the gas outlet 6 reaches a predetermined value or more. In this case, the cap member 60 can be reliably removed from the base member 20.

Furthermore, in this embodiment, the pair of first guide portions 51, 51 have tapered surfaces that gradually become narrower toward the radial inward side of the cylindrical portion 21.

According to the above aspect, even if the elastic piece 69 is displaced in the circumferential direction of the cylindrical portion 21 when the cap member 60 is attached to the base member 20, the first guide portion 51 corrects the displacement. Therefore, it is possible to make it easier to guide the object to the second guide portion 53.

Furthermore, in this embodiment, a claw portion of an elastic piece 69 guided by a second guide portion 53 is provided in a portion of the engaged portion 41 on the opposite side to the mounting direction F1 of the cap member 60 with respect to the base member 20. A receiving recess 55 is provided for receiving 71 .

According to the above aspect, when attaching the cap member 60 to the base member 20, the claw portion 71 of the elastic piece 69 guided by the second guide portion 53 is once received in the receiving recess 55, and the engaged portion The claw portion 71 rides over the engaged portion 41 while being positioned in the axial direction and circumferential direction of the engagement portion 41 . Therefore, the pushing force when pushing the cap member 60 effectively acts on the claw part 71, making it easier for the claw part 71 to get over the engaged part 41 (if there is no receiving recess 55, the cap member 60, the claw portion 71 is likely to be misaligned with respect to the engaged portion 41, making it difficult to get over the engaged portion 41). As a result, the claw portion 71 can be easily engaged with the engaged surface 42 of the engaged portion 41 on the side of the cap member attachment direction F1 relative to the base member 20, and the cap member 60 can be attached to the base member 20. Workability can be improved.

Further, in this embodiment, as shown in FIG. 6, the surface 43 of the engaged portion 41 facing the inner periphery of the elastic piece 69 has a top portion 43a and a surface 43 in the circumferential direction of the cylindrical portion 21 from the top portion 43a. and a curved surface 43b that gradually becomes lower in the direction of separation from each other.

According to the above aspect, when the gas pressure at the gas discharge port 6 becomes equal to or higher than a predetermined value and the engagement of the claw part 71 with the engaged part 41 is released, the claw part 71 moves toward the opposite side of the engaged part 41. It comes into sliding contact only with the top 43a of the surface 43. As a result, sliding resistance when the claw portion 71 gets over the engaged portion 41 can be suppressed, so that the claw portion 71 can easily get over the engaged portion 41, and the cap is removed from the base member 20. The member 60 can be easily removed.

Note that the present invention is not limited to the embodiments described above, and various modified embodiments are possible within the scope of the gist of the present invention, and such embodiments are also included in the scope of the present invention. .

1 Electricity storage device 6 Gas discharge port 10 Gas exhaust device for electricity storage device (exhaust device)
20 Base member 21 Cylindrical part 23 Passage 41 Engaged part 51 First guide part 53 Second guide part 55 Receiving recess 60 Cap member 61 Lid part 69 Elastic piece 71 Claw part

Claims (4)

1. A gas discharge device for a power storage device that discharges gas when gas pressure at a gas discharge port of the power storage device is equal to or higher than a predetermined value,
   a base member that is fixed to the gas exhaust port and has a cylindrical part formed therein with a passage communicating with the gas exhaust port, and an engaged part provided on the outer periphery of the cylindrical part;
   a cap member that is removably attached to the base member so as to close the outlet of the passage;
   a seal member disposed between the base member and the cap member,
   The cap member includes a lid portion, a pressing portion provided on the lid portion to press the sealing member, a pair of elastic pieces extending from positions facing each other in the circumferential direction of the lid portion, and each elastic piece. and a claw portion that is formed and engages with and disengages from the engaged portion, and the claw portion engages with the engaged portion while the pair of elastic pieces are bent and deformed outward, When the gas pressure at the gas discharge port is equal to or higher than a predetermined value, the claw portion is disengaged from the engaged portion and detached from the base member due to the pressure applied to the lid portion. Ori,
   The sealing member is mounted on the cylindrical part while being pressed by the pressing part to seal a gap between the base member and the cap member,
   On the outer periphery of the cylindrical part, a pair of first guide parts are located on both sides of the elastic piece in the width direction and guide the elastic piece when the cap member is attached to the base member, and a pair of first guide parts are provided on the outer periphery of the elastic piece. a pair of second elastic pieces located on both sides in the radial direction of the cylindrical part than the pair of first guide parts, and further guiding the elastic piece guided by the first guide part during the mounting; A guide portion is provided, where L1 is the gap between the pair of first guide portions, L2 is the gap between the pair of second guide portions, and L3 is the length of the elastic piece in the width direction. , L1>L2>L3.
2. 2. The gas exhaust device for an electricity storage device according to claim 1, wherein the pair of first guide portions have tapered surfaces that gradually become narrower toward the radial inward side of the cylindrical portion.
3. A receiving recess for receiving the claw portion of the elastic piece guided by the second guide portion is provided in a portion of the engaged portion opposite to the direction in which the cap member is attached to the base member. The gas exhaust device for an electricity storage device according to claim 1.
4. The power storage device according to claim 1, wherein the surface of the engaged portion that faces the inner periphery of the elastic piece has a top portion and a curved surface that gradually becomes lower in a direction away from each other in a circumferential direction of the cylindrical portion from the top portion. Gas exhaust device for devices.

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