WO2019064390A1

WO2019064390A1 - Electricity storage device

Info

Publication number: WO2019064390A1
Application number: PCT/JP2017/035038
Authority: WO
Inventors: 知也真壁
Original assignee: 本田技研工業株式会社
Priority date: 2017-09-27
Filing date: 2017-09-27
Publication date: 2019-04-04
Also published as: CN111164792B; CN111164792A; JP6837569B2; JPWO2019064390A1

Abstract

This electricity storage device is provided with: a secondary battery (11); a housing (10) formed in a substantially rectangular shape and internally housing the secondary battery (11) in a tightly closed state; and a discharge valve (31) for, when the pressure inside the housing (10) rises to a set pressure or more, releasing the pressure inside the housing (10) to the outside. The discharge valve (31) is configured using a valve element capable of opening and closing a discharge path (26) in accordance with the pressure inside the housing (10). A recess portion (30), the upper side and one side of which are opened, is provided on the upper wall (10a) of the housing (10). The upper side of the recess portion (30) is covered with a lid member (40). The discharge valve (31) is disposed inside the recess portion (30). A ventilation space (45) is provided between the bottom surface (30a-1) of an opening portion (30a) on the one side of the recess portion (30) and the lid member (40).

Description

Power storage device

The present invention relates to a power storage device.

As a power storage device mounted on a vehicle or the like, a secondary battery such as a lithium ion battery is housed in a sealed state inside a housing, and when the pressure inside the housing rises above a set pressure, the inside It is known that an exhaust valve is provided for releasing the pressure of the air to the outside (see, for example, Patent Document 1).

When the exhaust valve provided in this type of storage device is closed by a deformable sealing member, the portion in electrical communication with the inside of the housing is deformed when the sealing member receives pressure in the housing and is deformed more than a certain amount. And the sealing member contacts and breaks the pin member. The exhaust valve exhausts the gas in the housing to the outside by breaking the sealing member.

Although there is no concern that foreign substances such as water droplets will enter the inside of the housing through the exhaust valve during normal use, the storage device with such an exhaust valve usually has a high product cost due to the complicated structure of the exhaust valve. It is easy to cause. Moreover, in the case of this power storage device, it is not possible to prevent the entry of foreign matter from the outside after the exhaust valve has been activated once.

JP 2011-508394

The problem to be solved is to enable simplification of the structure of the exhaust valve and repeated use, and to be able to suppress the entry of foreign matter from the exhaust valve portion for a long period of time.

A battery device according to one aspect of the present invention includes a secondary battery (11) and a case (10) which is formed in a substantially rectangular shape and houses the secondary battery (11) in a sealed state therein; An exhaust valve (31) for releasing the pressure in the casing (10) to the outside when the pressure in the casing (10) rises to a set pressure or higher; ) Is constituted by a valve element capable of opening and closing the exhaust passage (26) according to the pressure inside the case (10), and the recess (30) opened at one side and the upper side is the case (10) The cover member (40) is provided on the upper wall (10a) and covers the recess (30) from the upper side, and the exhaust passage (26) and the exhaust valve ( 31), and the bottom surface (30a-1) of the open portion (30a) on one side of the recess (30) Wherein between the cover member (40), characterized in that the venting gap (45) is provided with.

In this case, since the exhaust valve (31) opens and closes the exhaust passage (26) according to the pressure inside the housing (10), the exhaust valve (31) has a simple structure. The same function can be obtained continuously even after the unit has been activated once. In this case, the exhaust passage (26) and the exhaust valve (31) are disposed inside the recess (30), and the upper side of the recess (30) is covered by the lid member (40). For this reason, even if foreign matter such as water droplets or the like may drip or scatter on the upper surface side of the housing (10), the lid member (40) can prevent the foreign matter from entering the exhaust valve (31). it can. Further, when the pressure of the gas inside the housing (10) is increased and the valve body opens the exhaust passage (26), the gas is the bottom surface (30a-1) of the open portion (30a) and the lid member (40) Through the ventilating gap (45) provided between the two. Therefore, when this configuration is adopted, it is possible to prevent foreign matter from entering the inside of the housing (10) for a long time.

The ventilation gap (45) may be opened in a direction substantially perpendicular to the extending direction of the fixing band (50) for fixing the housing (10) to the fixed part of the vehicle.

In this case, since the ventilation gap (45) is opened in the direction substantially orthogonal to the extending direction of the fixing band (50), the ventilation gap (45) is not closed by the fixing band (50). Therefore, when the pressure of the gas inside the housing (10) is increased and the valve body is opened, the gas can be reliably discharged to the outside through the ventilation gap (45).

Inside the recess (30) is provided a surrounding wall (33) having a substantially U-shape in a top view and surrounding the three sides except the one side, and the upper surface of the surrounding wall (33) The cover member (40) may be formed lower than the upper surface of 10), and the lid member (40) may be in contact with the upper surface of the surrounding wall (33).

In this case, by bringing the lid member (40) into contact with the upper surface of the surrounding wall (33), the lid member (40) can be stably installed above the recess (30), and the lid member (40) can be suppressed from largely protruding from the upper surface of the housing (10).

A groove (35) having a substantially U-shaped top view is provided in an outer region of the surrounding wall (33) inside the recess (30), and the lid member (40) is provided with the substantially U-shape. A guide protrusion (34) having a substantially U-shape in a bottom view that can be inserted into the groove (35) may be provided.

In this case, the lid member (40) is stabilized above the recess (30) by inserting the guide protrusion (34) of the lid member (40) into the substantially U-shaped groove (35) in the recess (30) Can be installed.

The surrounding wall (33) is formed higher than the exhaust valve (31) disposed inside the recess (30), and the substantially U-shaped groove (35) has an adhesive (42). It may be filled.

In this case, the guide protrusion (34) of the lid member (40) can be fixed by the adhesive (42) filled in the substantially U-shaped groove (35). Therefore, the lid member (40) can be stably and firmly fixed above the recess (30). Further, since the surrounding wall (33) is formed higher than the exhaust valve (31), the valve body of the exhaust valve (31) can be prevented from interfering with the lid member (40), and the adhesive (42) Can be prevented from passing over the surrounding wall (31) and adhering to the exhaust valve (31).

The lid member (40) is formed with a convex covering portion (40b) covering the upper side of the opening portion (30a) on one side of the concave portion (30), and the convex covering portion (40b) An extension (40c) extending to the opposite side of the guide projection (34) is formed at an edge opposite to the first side, and at a position opposite to the one side inside the recess (30) A shelf (36) may be formed on which the extension (40c) of the lid (40) abuts.

In this case, the convex covering portion (40b) of the lid member (40) can cover the upper side of the opening portion (30a) on one side of the concave portion (30), so the concave portion (30) passes through the opening portion (30a) It is possible to suppress the entry of foreign matter into the inside. In addition, the cover member (40) is placed in a stable posture by bringing the extension (40c) extending from the other side of the lid member (40) into contact with the shelf (36) in the recess (30), And it can be installed in the recess (30) at the correct position. Therefore, when this configuration is adopted, the ventilation gap (45) between the bottom surface (30a-1) of the open portion (30a) on one side of the recess (30) and the convex covering portion (40b) You can easily manage the width.

The bottom surface (30a-1) of the open portion (30a) on one side of the recess (30) may be formed to be lower than the upper surface height of the exhaust passage (26).

In this case, since the bottom surface (30a-1) of the open portion (30a) of the recess (30) is formed lower than the top surface height of the exhaust passage (26), temporarily the recess (30) passes through the passage gap (45). Even if foreign matter such as water droplets intrudes into the inside, the foreign matter can be prevented from adhering to the upper part of the exhaust passage (26) or entering into the exhaust passage (26).

According to the power storage device of the present invention, the exhaust passage and the valve body capable of opening and closing the exhaust passage are provided inside the concave portion provided on the upper wall of the housing, and the exhaust valve is constituted by the valve body The structure of the exhaust valve can be simplified and can be used repeatedly even after the exhaust valve has been activated once.

Further, in the power storage device of the present invention, the exhaust passage and the exhaust valve are disposed inside the recess, and the ventilation gap is provided between the bottom of the open portion on one side of the recess and the lid member. At the time of operation, gas can be discharged to the outside through the ventilation gap, and entry of foreign matter such as water droplets from the exhaust valve portion can be suppressed for a long time.

It is a perspective view of the electrical storage apparatus of embodiment. It is a top view of the electrical storage apparatus of embodiment. FIG. 3 is a cross-sectional view taken along line III-III of FIG. 2 of the power storage device of the embodiment. It is the perspective view of the part which removed the cover member of the electrical storage apparatus of embodiment. It is a perspective view of a lid member of an embodiment. It is a perspective view of a part of power storage device of an embodiment. It is a perspective view of the cover member of other embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. The power storage device 1 according to the present embodiment is a power storage device mounted on a vehicle such as a motorcycle, and has a structure that can be repeatedly charged and discharged.

FIG. 1 is a perspective view showing the entire configuration of power storage device 1, and FIG. 2 is a plan view of power storage device 1. FIG. 3 is a view showing a cross section along line III-III of FIG. 2 of power storage device 1.
The power storage device 1 includes a substantially rectangular case 10, and inside the case 10, as shown in FIG. 3, a plurality of secondary batteries 11 are accommodated. The case 10 has a lower case 10L and an upper case 10U coupled to the upper portion of the lower case 10L, and the lower case 10L and the upper case 10U are partitioned by the partition wall 12 There is. The plurality of secondary batteries 11 are accommodated in the lower housing 10L. The battery monitoring circuit 21 accommodated in the protective case 20 is disposed inside the upper housing 10U. The battery monitoring circuit 21 monitors the voltage of the secondary battery 11 and cuts off the charging current to the secondary battery 11 when the secondary battery 11 is overcharged.

The secondary battery 11 is configured of, for example, a lithium ion battery, a nickel hydrogen battery, a sodium ion battery or the like. For example, the positive electrode 14, the negative electrode 15, the separator 16, the non-aqueous electrolyte 17, and the like are housed inside the container 13 of the secondary battery 11. In the container 13 of the secondary battery 11, a battery terminal 18 (a positive electrode terminal and a negative electrode terminal) for charging and discharging a current is provided.

As shown in FIG. 1 and FIG. 2, in the left and right upper corner portions of one side along the longitudinal direction of the housing 10, a stepped portion which is stepped down with respect to the upper surface of the general portion of the upper wall 10 a of the housing 10 10b are provided, and the

external electrodes

25A and 25B are provided on the respective step portions 10b. The

external electrodes

25A, 25B (positive electrode and negative electrode) are connected to the battery terminal 18 of the secondary battery 11 inside the housing 10.

In the partition wall 12 which divides the lower housing 10L and the upper housing 10U, through holes 19 for allowing gas generated from the secondary battery 11 to flow to the upper housing 10U are formed. In the upper wall 10a of the upper housing 10U, an exhaust passage 26 for discharging the gas flowing into the upper housing 10U through the through hole 19 to the outside of the housing 10 is provided. The inside of the housing 10 is sealed except for the exhaust passage 26.

At a position of the upper wall 10a of the housing 10 adjacent to the stepped portion 10b on the side where the one external electrode 25A is installed, a concave portion 30 whose upper side and one side are released is formed. The recess 30 is opened toward the stepped portion 10 b in the direction along the longitudinal direction of the housing 10. That is, the side open part 30a of the recessed part 30 is formed in the shape which partially cut the side wall of the level | step-difference part 10b. A lid member 40 formed of a resin material or the like is attached above the recess 30.

An exhaust passage 26 penetrating the upper wall 10 a of the housing 10 is formed at the bottom on the central side of the recess 30. As shown in FIG. 3, the exhaust passage 26 is formed in a cylindrical portion 27 that protrudes upward from a central bottom portion of the recess 30. A cap-like valve body 31 made of a rubber-like elastic body is attached to an upper portion of the cylindrical portion 27. The valve body 31a constitutes an exhaust valve 31 for releasing the pressure inside the housing 10 to the outside when the pressure inside the housing 10 rises above the set pressure. The valve body 31 a opens and closes the exhaust passage 26 in accordance with the pressure inside the housing 10.

4 is a perspective view showing a part of the upper wall 10a of the housing 10 (upper housing 10U) from which the cover member 40 has been removed, and FIG. 5 is a perspective view of the cover member 40. As shown in FIG. 6 is a perspective view showing a part of the upper wall 10a of the case 10 (upper case 10U) to which the lid member 40 is attached.
From inside the recess 30 of the housing 10, a surrounding wall 33 having a substantially U-shape in a top view and surrounding three sides except one side facing the step portion 10b is provided in a protruding manner. The upper surface 33a of the surrounding wall 33 is formed lower than the upper surface of the upper wall 10a of the housing 10 by the thickness of the lid member 40 (the thickness of the portion excluding the guide projection 34 and the convex covering portion 40b described later). The lower surface of the lid member 40 abuts on the upper surface 33 a of the surrounding wall 33 when the lid member 40 is attached to the recess 30.
The upper surface 33 a of the surrounding wall 33 is formed higher than the upper surface of the valve body 31 a of the exhaust unit 31.

A U-shaped groove 35 which is a substantially U-shaped groove in top view is formed in the outer region of the surrounding wall 33 inside the recess 30. The width of the outer region of the surrounding wall 33 in the recess 30 (the front-rear width in the direction orthogonal to the longitudinal direction of the housing 10) is wider than the front-rear width of the open portion 30a of the recess 30. The front-rear width of the open portion 30 a is the same as the front-rear width of the inner surface of the surrounding wall 33. That is, the inner surfaces of the front and rear walls of the surrounding wall 33 and the inner surface of the open portion 30 are continuous by a continuous plane. The depth of the U-shaped groove 35 is greater than the depth of the bottom surface of the inner region of the surrounding wall 33.

The connection groove part which connects two mutually spaced apart parallel groove parts among the U-shaped grooves 35 is arrange | positioned on the opposite side to the open part 30a. A shelf 36 having the same height as the surrounding wall 33 is formed on the wall of the connecting groove of the U-shaped groove 35 opposite to the opening 30a.

The lid member 40 is formed in substantially the same top view shape as the recess 30 on the housing 10 side. That is, on one end side of the lid main body portion 40a having a substantially rectangular shape in top view, a convex covering portion 40b having substantially the same width as the opening portion 30a of the recess 30 is formed. The convex covering portion 40b protrudes downward with a predetermined thickness, and the protruding portion is fitted into the open portion 30a of the concave portion 30, as shown in FIG. The lower surface of the convex covering portion 40b forms a ventilation gap 45 with the bottom surface 30a-1 of the open portion 30a. The ventilation gap 30a-1 is a gap for discharging the gas to the outside of the housing 10 when the gas pressure inside the housing 10 is increased and the exhaust valve 31 is opened. The ventilation gap 45 is opened toward the side surface of the stepped portion 10b of the upper wall 10a of the housing 10 facing the external electrode 25A.
The bottom surface 30a-1 of the open portion 30a is formed lower than the top surface of the exhaust passage 26. The bottom surface 30a-1 of the open portion 30a may be formed substantially horizontally, but it is desirable that the bottom surface 30a-1 be inclined downward toward the outer end of the passage gap 30a-1.

Further, on the back surface of the lid main body 40 a of the lid member 40, a guide protrusion 34 substantially U-shaped in a bottom view is provided in a protruding manner. The guide projection 34 is provided so as to project over the side portions before and after intersecting the protruding side of the convex covering portion 40b of the lid member 40 and the region close to the side opposite to the convex covering portion 40b. There is. The protruding height of the guide protrusion 34 is a fixed height. Further, at the edge of the side opposite to the convex covering portion 40b of the lid member 40, an extending portion 40c is provided which extends to the side opposite to the convex covering portion 40b with respect to the guide projection 34.

The lid member 40 is fitted into the recess 30 of the housing 10, and at this time, the guide protrusion 34 is inserted into the U-shaped groove 35 of the recess 30. Further, at this time, the inner region of the lower surface of the lid member 40 than the guide protrusion 34 abuts on the upper surface 33 a of the surrounding wall 33, and the lower surface of the extension 40 c abuts on the upper surface of the shelf 36 in the U-shaped groove 35. . As shown in FIG. 2, the adhesive 42 is pre-filled inside the U-shaped groove 35 of the recess 30, and the guide protrusion 34 is U-shaped by the adhesive 42 when the lid member 40 is fitted into the recess 30. It is fixed to the inner wall of 35.

Here, power storage device 1 is fixed to the fixed portion of the vehicle using, for example, fixing band 50 shown in FIG. Fixing band 50 is wound around a central region in a longitudinal direction of housing 10 of power storage device 1 to fix power storage device 1 on a vehicle body. The ventilation gap 45 formed by the open portion 30a of the housing 10 and the lid member 40 is open on the side surface of the stepped portion 10b facing the external electrode 25A. It opens in the orthogonal direction.

As described above, in the electric storage device 1 of the present embodiment, the exhaust passage 26 and the valve body 31 a capable of opening and closing the exhaust passage 26 are provided inside the recess 30 provided in the upper wall 10 a of the housing 10 The exhaust valve 31 is constituted by the valve body 31a. Therefore, the configuration of the exhaust valve 31 for releasing the gas to the outside when the gas pressure in the housing 10 is increased can be simplified, and the same function can be obtained even after the exhaust valve 31 is activated once. Can be obtained continuously.

Further, in the power storage device 1 of the present embodiment, the exhaust passage 26 and the valve body 31 a are provided inside the recess 30 provided in the housing 10, and the bottom surface 30 a-1 of the open portion 30 a on the side of the recess 30 A ventilation gap 45 is provided between the lid members 40 in order to discharge the gas to the outside. Therefore, when the pressure of the gas inside the housing 10 is increased and the exhaust valve 31 is opened, the gas can be discharged to the outside through the ventilation gap 45, and foreign matter such as water droplets from the exhaust valve 31 portion is the housing It is possible to suppress entry into 10 for a long time. That is, since the inside of the recess 30 communicates with the outside through the narrow ventilation gap 45 which opens in a lateral direction, the foreign matter such as water droplets or dust flowing from the upper side is introduced into the recess 30 by the lid member 40. Can be prevented as much as possible.

Further, in the case of the power storage device 1 of the present embodiment, since the ventilation gap 45 is provided between the bottom surface 30a-1 of the open portion 30a on the side of the recess 30 and the lid member 40, Even if the water enters, the water droplets can be discharged to the outside through the ventilation gap 45 by slightly inclining the housing 10 or maintaining the upright posture.
Furthermore, by narrowing the upper and lower widths of the ventilation gap 45, it is possible to prevent the exhaust valve 31 from being tampered with by a tool such as a driver.

Furthermore, in the power storage device 1 of the present embodiment, the ventilation gap 45 opens in a direction substantially perpendicular to the extending direction of the fixing band 50 for fixing the housing 10 to the fixed portion of the vehicle. Therefore, even if the winding position of the fixing band 50 is slightly deviated, the ventilation gap 45 is not closed by the fixing band 50. Therefore, when the power storage device 1 of the present embodiment is employed, when the pressure of the gas inside the housing 10 is increased and the valve body 31a is opened, the gas is reliably discharged to the outside through the ventilation gap 45. be able to.

Further, in the power storage device 1 of the present embodiment, the surrounding wall 33 having a substantially U-shape in a top view and surrounding the three sides except one side is provided inside the recess 30, and the upper surface 33a of the surrounding wall 33 is a housing The lid member 40 is formed to be lower than the upper surface 10, and is in contact with the upper surface 33 a of the surrounding wall 33. Therefore, by bringing the lower surface of the lid member 40 into contact with the upper surface 33 a of the surrounding wall 33, the lid member 40 can be stably installed above the recess 30. In addition, when the lid member 40 abuts on the upper surface 33 a of the surrounding wall 33, the lid member 40 can be suppressed from largely protruding upward from the upper surface of the housing 10.

Furthermore, in the case of the power storage device 1 of the present embodiment, the U-shaped groove 35 is provided in the outer region of the surrounding wall 33 inside the recess 30, and the lid member 40 has a substantially bottom view that can be inserted into the U-shaped groove 35. A U-shaped guide protrusion 34 is provided. Therefore, by inserting the guide projection 34 of the lid member 40 into the U-shaped groove 35 in the recess 30, the lid member 40 can be stably installed above the recess 30.

Furthermore, in the power storage device 1 of the present embodiment, the upper surface 33 a of the surrounding wall 33 is formed higher than the exhaust valve 31 disposed inside the recess 30, and the adhesive 42 is filled in the U-shaped groove 35. It has become. Therefore, the guide protrusion 34 of the lid member 40 can be stably and firmly fixed to the housing 10 by the adhesive 42 filled in the U-shaped groove 35. Further, in the power storage device 1 of the present embodiment, since the surrounding wall 33 is formed higher than the exhaust valve 31, the valve body 31 a is prevented from interfering with the lid member 40 when the exhaust valve 31 operates. It is possible to prevent the adhesive 42 filled in the U-shaped groove 35 from passing over the surrounding wall 33 and adhering to the exhaust valve 31.

Further, in the power storage device 1 of the present embodiment, a convex covering portion 40 b that covers the upper side of the opening portion 30 a of the recess 30 is formed in the lid member 40. For this reason, it is possible to more effectively prevent foreign matter from entering the recess 30 through the open portion 30a by the convex covering portion 40b.

Furthermore, in the electric storage device 1 of the present embodiment, an extension 40c extending to the opposite side of the guide projection 34 is formed at the edge of the lid 40 opposite to the convex covering 40b. A shelf 36 with which the lower surface of the extension 40 c of the lid 40 abuts is formed at a position corresponding to the extension 40 c of the inner lid 40. Therefore, by bringing the lower surface of the extension 40c of the lid member 40 into contact with the shelf 36 in the recess 30, the lid member 40 can be installed in the recess 30 in a stable posture and at an accurate position. . Therefore, when the power storage device 1 of the present embodiment is employed, the width of the ventilation gap 45 between the bottom surface 30a-1 of the open portion 30a of the recess 30 and the convex covering portion 40b can be easily managed. .

Further, in the power storage device 1 of the present embodiment, the bottom surface 30a-1 of the open portion 30a of the recess 30 is formed to be lower than the upper surface height of the exhaust passage 26. Therefore, even if foreign matter such as water droplets or the like enters into the recess 30 through the passage gap 45, the foreign matter can be prevented from adhering to the upper portion of the exhaust passage 26 or entering into the exhaust passage 26. .
Furthermore, in the case where the bottom surface 30a-1 of the open portion 30a is inclined downward toward the open end outside the passage gap 45, when foreign matter such as water droplets enter the recess 30, the foreign matter is removed. While it becomes possible to discharge to the outside more easily, it becomes difficult for foreign matter to enter into the recess 30 through the passage gap 45.

In the embodiment described above, the extending portion 40c is formed only at the edge opposite to the convex covering portion 40b of the lid member 40, but like the lid member 40A of the other embodiment shown in FIG. An extension piece 40d may be provided on the front and rear sides of the lid member 40A adjacent to the extension portion 40c so as to protrude outward beyond the guide protrusion 34. In this case, if the shelf which abuts on the lower surface of the extension piece 40d on the front and rear sides of the lid member 40A is installed in the U-shaped groove on the housing side, the lid member 40A is more stably installed in the recess. can do.

The present invention is not limited to the above embodiment, and various design changes can be made without departing from the scope of the invention.

DESCRIPTION OF SYMBOLS 1 battery apparatus 10 case 10a upper wall 11 secondary battery 26 exhaust passage 30 recessed part 30a open part 30a-1 bottom face 31 exhaust valve 33 surrounding wall 34 guide protrusion 35 square groove (groove)
36

Shelf

40, 40A Lid 40b Convex Cover 40c Extension 42 Adhesive 45 Air Gap 50 Fixing Band

Claims

With a secondary battery (11),
A housing (10) formed in a substantially rectangular shape and housing the secondary battery (11) in a sealed state;
And a discharge valve (31) for releasing the pressure in the case (10) to the outside when the pressure in the case (10) rises above a set pressure.
The exhaust valve (31) is constituted by a valve body capable of opening and closing the exhaust passage (26) according to the pressure inside the housing (10),
A recess (30) which is open at the upper side and one side is provided in the upper wall (10a) of the housing (10), and a lid member (40) covering the recess (30) from above is provided.
The exhaust passage (26) and the exhaust valve (31) are arranged inside the recess (30),
A ventilation gap (45) is provided between the bottom surface (30a-1) of the open portion (30a) on one side of the recess (30) and the lid member (40). apparatus.
The ventilation gap (45) is open in a direction substantially perpendicular to the extending direction of a fixing band (50) for fixing the housing (10) to a fixed part of the vehicle. Power storage device as described in.
Inside the recess (30), there is provided a surrounding wall (33) having a substantially U-shape in a top view and surrounding three sides except the one side.
The upper surface of the surrounding wall (33) is formed lower than the upper surface of the housing (10),
The power storage device according to claim 1 or 2, wherein the lid member (40) is in contact with the upper surface of the surrounding wall (33).
A groove (35) having a substantially U-shaped top view is provided in the outer region of the surrounding wall (33) inside the recess (30),
The lid member (40) is provided with a guide protrusion (34) having a substantially U-shaped bottom view that can be inserted into the substantially U-shaped groove (35). Power storage device as described.
The surrounding wall (33) is formed higher than the exhaust valve (31) disposed inside the recess (30),
The power storage device according to claim 4, wherein an adhesive (42) is filled in the substantially U-shaped groove (35).
The lid member (40) is formed with a convex covering portion (40b) covering the upper side of the opening portion (30a) on one side of the concave portion (30), and the convex covering portion (40b) An edge (40c) extending to the opposite side with respect to the guide protrusion (34) is formed at an edge opposite to the
A shelf (36) with which the extension (40c) of the lid (40) abuts is formed at a position opposite to the one side inside the recess (30). The power storage device according to claim 5.
The bottom surface (30a-1) of the open portion (30a) on one side of the concave portion (30) is formed lower than the upper surface height of the exhaust passage (26). The power storage device according to any one of the above.