JP6863916B2 - Power storage device - Google Patents

Description

The present invention relates to a power storage device in which one or more power storage elements are housed in an exterior body.

A non-aqueous electrolyte secondary battery such as a lithium ion battery is installed as a power source or auxiliary power source for automobiles such as EV (Electric Vehicle), PHEV (Plug-in Hybrid Electric Vehicle), HEV (Hybrid Electric Vehicle), and gasoline engine vehicles. A power storage device is used (see, for example, Patent Document 1). Among such power storage devices, there are those in which a plurality of cells are sealed and stored in an exterior body.

By the way, in the non-aqueous electrolyte secondary battery, in the event of an abnormality such as overcharging or internal short circuit, the gas discharge valve (safety valve) provided in the cell is opened, and gas is discharged from the safety valve to the inside of the exterior body. .. For this reason, some power storage devices are provided with an exhaust port (communication passage) for discharging gas to the outside of the exterior body.

Japanese Unexamined Patent Publication No. 2007-195311

However, since this exhaust port is a communication portion in which a communication passage for communicating the space inside the exterior body of the power storage device and the space outside the exterior body is formed, for example, the power storage device is mounted on an automobile. If this is the case, for example, foreign matter such as water scattered from the outside during high-pressure car washing or traveling may enter the exterior of the power storage device through the continuous passage.

Further, in the power storage device, when a predetermined water pressure is applied to the exterior body when submerged in water, water easily flows into the inside of the exterior body of the power storage device from the exhaust port, so that it is necessary to prevent the inflow of water. is there.

Therefore, the present invention has been made in view of such a situation, and is a power storage device having a continuous passage capable of discharging the gas generated at the time of abnormality to the outside of the exterior body, and is inside the exterior body of the power storage device. It is an object of the present invention to provide a power storage device in which foreign matter such as water does not easily enter and water does not easily flow into the exterior body from the continuous passage.

In order to achieve the above object, the power storage device according to one embodiment of the present invention includes one or more power storage elements and an exterior body for accommodating the one or more power storage elements, and the exterior body is the exterior. It has a communication part that forms a communication passage for communicating the space inside the body and the space outside the body, and the communication part has (1) a functional film that allows gas to pass through and does not allow liquid to pass through. , (2) Communicate with the internal space in the first direction, and (3) Communicate with the external space in the second direction substantially orthogonal to the first direction.

Further, the functional film may be arranged in a direction substantially parallel to the second direction.

Further, the communication portion is composed of a first member and a second member, and the first member forms a first passage on the inner side of the exterior body in the communication passage, and the second member is formed by the second member. A second passage on the outer side of the exterior body in the continuous passage is formed, and the functional film may be held by being sandwiched between the first member and the second member.

Further, on the inner wall of the first member and the other of the second member, an opposing portion facing one end of the first member and the second member is formed, and the functional film is formed of the first member. It may be held between one end of one member and the second member and the other opposing portion of the first member and the second member.

Further, the communication portion further has an annular gasket for sealing the first member and the second member, which is sandwiched between the portions where the first member and the second member are joined. May be good.

In order to achieve the above object, one or more power storage elements and an exterior body for accommodating the one or more power storage elements are provided, and the exterior body communicates between the internal space and the external space of the exterior body. It has a communication portion that forms a communication passage for allowing the gas to pass through, and the communication portion has a functional membrane that allows gas to pass through and does not allow liquid to pass through.

According to this, since the communication portion is provided with a functional membrane that allows gas to pass through and does not allow liquid to pass through, foreign matter such as water scattered in the communication portion enters from the communication passage to the inside of the exterior body. It is possible to prevent invasion and water from flowing into the inside of the exterior body from the communication passage in the case of submersion.

Further, for example, when the pressure in the space inside the exterior body is equal to or less than a predetermined pressure, the communication portion is in the first state of blocking the communication passage, and the pressure in the internal space is larger than the predetermined pressure. In this case, the communication passage has a pressure valve in a second state in which the internal space and the external space are communicated with each other, and the pressure valve is on the outer space side of the functional membrane in the communication passage. May be placed in.

According to this, the outer space of the power storage device communicates with the inner space of the outer body and the outer space only when the pressure in the space inside the outer body rises higher than the pressure in the space outside the outer body. A pressure valve for adjusting the pressure is provided, and a functional film that allows gas to pass through the space side inside the pressure valve in the communication passage is provided. The pressure valve is arranged on the outer space side of the functional membrane.

Therefore, when the pressure in the space inside the exterior body becomes larger than the predetermined pressure due to the generation of gas from the power storage element in an abnormal situation, the gas can pass through the functional membrane and the pressure valve is second. Since it is in a state, the generated gas can be discharged to the outside of the exterior body. In addition, since the pressure valve is normally in the first state, the space inside the exterior body can be kept sealed, and foreign matter can enter the space inside from the space outside the exterior body. Can be reliably prevented. Furthermore, when a predetermined water pressure is applied to the continuous passage, such as when submerged, the intrusion of water, which is difficult to prevent with a pressure valve, can be prevented by a functional membrane that does not allow liquid to pass through, so that the predetermined water pressure is applied to the continuous passage. Even in such a case, it is possible to prevent water from entering the space inside the exterior body. Further, even if the water injected at high pressure in a high-pressure car wash or the like infiltrates, the pressure valve can prevent the water from reaching the functional membrane. Therefore, it is possible to prevent the functional membrane from being damaged by the water injected at high pressure.

Further, for example, the communication portion is composed of a first member and a second member, and the first member forms a first passage on the inner side of the exterior body in the communication passage, and the second member. Formes a second passage on the outer side of the exterior body in the continuous passage, and the functional film may be held by being sandwiched between the first member and the second member.

According to this, the communication passage is composed of two members, a first member forming the inner side and a second member forming the outer side and holding the pressure valve, and the first member. The functional film is held by being sandwiched between the second member and the second member. Therefore, it is possible to realize a configuration in which the functional membrane is arranged on the inner side of the communication passage rather than the pressure valve with a simple configuration.

Further, for example, in the first member and the second member, one outer wall surface of the first member and the second member and the other inner wall surface of the first member and the second member are screwed together. It may be joined by.

According to this, since the first member and the second member are joined by screwing, a stronger joining between the first member and the second member can be realized with a simple configuration.

Further, for example, on the inner wall of the first member and the other of the second member, an opposing portion facing one end of the first member and the second member is formed, and the functional film is formed on the functional film. It may be held by being sandwiched between one end of the first member and the second member and the other facing portion of the first member and the second member.

According to this, the functional film is held by being sandwiched between one end portion of the first member and the second member joined by screwing and the other facing portion. Therefore, stronger retention of the functional film can be realized with a simple configuration.

Further, for example, the communication portion further has an annular gasket for sealing the first member and the second member, which are sandwiched between the portions where the first member and the second member are joined. You may.

According to this, since the gasket is provided between the first member and the second member, the joint portion between the first member and the second member can be brought into close contact with each other, and a predetermined value can be obtained, for example, when submerged. When water pressure is applied to the continuous passage, it is possible to prevent water from entering the inside of the exterior body from the joint.

According to the power storage device according to the present invention, the power storage device has a communication passage capable of discharging the gas generated at the time of abnormality to the outside of the exterior body, and foreign matter and the like are difficult to enter into the space inside the exterior body of the power storage device. Moreover, it is possible to prevent water from entering from the continuous passage.

It is a perspective view of the power storage device which concerns on embodiment of this invention. It is an exploded perspective view of the power storage device. It is an enlarged view of the part of the region A1 in FIG. It is a schematic diagram which shows the flow of the gas discharged from the internal space of the exterior body of a power storage device when gas is generated at the time of abnormality. It is a figure which shows the structure of the communication passage of an exterior body. It is a figure which shows the specific example for realizing the structure which provided the pressure valve on the outer space side of the communication passage, and provided the functional membrane on the inner space side. It is a bb cross-sectional view when the exploded perspective view of FIG. 6 is assembled. It is a figure which shows the communication passage of the modification (1). It is a figure which shows the communication passage of another form of the modification (1).

Hereinafter, embodiments will be described with reference to the drawings. It should be noted that all of the embodiments described below show a preferred specific example of the present invention. Numerical values, shapes, materials, components, arrangement positions of components, connection forms, and the like shown in the following embodiments are examples, and are not intended to limit the present invention. Further, among the components in the following embodiments, the components not described in the independent claims indicating the highest level concept of the present invention will be described as arbitrary components constituting the more preferable form.

(Embodiment)
FIG. 1 is a perspective view of a power storage device according to an embodiment of the present invention. FIG. 2 is an exploded perspective view of the power storage device. FIG. 3 is an enlarged view of a portion of the region A1 in FIG.

In these figures, the Z-axis direction is shown as the vertical direction, and the Z-axis direction will be described below as the vertical direction. However, depending on the usage mode, the Z-axis direction may not be the vertical direction. The Z-axis direction is not limited to the vertical direction. Further, in each of the X-axis direction, the Y-axis direction, and the Z-axis direction in these figures, the direction at the tip of the arrow is the positive direction, and the direction on the opposite side is the negative direction. The same applies to the following figure.

As shown in these figures, the power storage device 100 includes an exterior body 200, a plurality of bus bars 300, and a plurality of (four in the present embodiment) power storage elements 400.

The exterior body 200 is a box-shaped member that houses a plurality of power storage elements 400. The exterior body 200 forms an internal space S1 in a closed state, and stores a plurality of power storage elements 400 in the internal space S1. The exterior body 200 has a bottomed square tubular outer body main body 220 and a lid 210 that closes the opening of the outer body main body 220. In the exterior body 220, a plurality of power storage elements 400 arranged in the X-axis direction are arranged at predetermined positions, each power storage element 400 is protected from an impact or the like, and each power storage element 400 unwillingly comes into contact with a metal member or the like. It is a member that avoids. The exterior body 200 is made of an insulating material such as resin.

Further, the exterior body 200 has an external positive electrode terminal 110 and an external negative electrode terminal 120. The external positive electrode terminal 110 and the external negative electrode terminal 120 are terminals connected to the external load to supply the electric power stored in the electric power storage device 100 to the external load, or the electric power storage device that supplies the electric power supplied from the external power source. It is a terminal connected to an external power source to store in 100.

The lid body 210 has a communication portion 130 that forms a communication passage W10 for communicating the internal space S1 formed by the exterior body 200 and the space outside the exterior body (hereinafter, referred to as “external space S2”). An exhaust hose 500 that communicates with the outside air is connected to the end of the communication portion 130 (that is, the outer end of the communication portion 130). Further, although the communication portion 130 is formed on the lid body 210, it may be formed on the exterior body main body 220. That is, the communication portion 130 may be formed on the exterior body 200, and the position where the communication portion 130 is formed on the exterior body 200 is not limited.

The power storage element 400 is an element that can be charged and discharged, and has a conductive container 410, a positive electrode terminal 420, and a negative electrode terminal 430. The power storage element 400 is a secondary battery containing a non-aqueous electrolyte, for example, a lithium ion secondary battery. As the power storage element 400, a capacitor may be used instead of the lithium ion secondary battery. The container 410 of the power storage element 400 is provided with a safety valve 440 for discharging the gas generated inside the container 410 in the event of an abnormality such as when the power storage element 400 is overcharged or an internal short circuit occurs. The positive electrode terminal 420 and the negative electrode terminal 430 project above the container 410. The plurality of power storage elements 400 are arranged in a row in the X-axis direction with the upper side of the container 410 oriented sideways so as to face the Y-axis direction.

Further, in each of the plurality of power storage elements 400, different pole terminals are connected to each other by a bus bar 300 which is a metal plate-shaped member. That is, the plurality of power storage elements 400 are connected in series by the bus bar 300. In the plurality of power storage elements 400 connected in series by the bus bar 300, the positive electrode side is connected to the external positive electrode terminal 110, and the negative electrode side is connected to the external negative electrode terminal 120 via the circuit board 310.

Further, the circuit board 310 is housed outside the arrangement direction (X-axis direction) of the plurality of power storage elements 400 in the internal space S1 of the exterior body body 220. The circuit board 310 has a function of monitoring an electric state such as a charge state and a discharge state of the plurality of power storage elements 400 and controlling charging / discharging of the plurality of power storage elements 400.

Next, the communication unit 130 will be described with reference to FIGS. 4 and 5. FIG. 4 is a diagram showing a flow of gas discharged from the internal space of the exterior body of the power storage device when gas is generated from the power storage element at the time of abnormality. FIG. 5 is a diagram showing a configuration of a continuous passage of the exterior body.

As shown in FIG. 5, the communication portion 130 has a pressure valve 150 and a functional film 160. The pressure valve is in the first state of closing the communication passage W10 when the pressure in the internal space S1 is equal to or less than the predetermined pressure, and when the pressure in the internal space S1 is larger than the predetermined pressure, the internal space S1 and the external space in the communication passage W10. It is in the second state of communicating with S2. The pressure valve 150 is preferably a return type valve, and is an umbrella valve in the present embodiment. The detailed structure of the pressure valve 150 will be described later. The "return type valve" is a valve capable of performing pressure adjustment a plurality of times so that the pressure between the internal space S1 and the external space S2 becomes equal. The pressure valve 150 is preferably a return type, but is not limited to the return type. The functional membrane 160 is a membrane arranged on the internal space S1 side of the pressure valve 150 in the communication passage W10, and is a membrane that allows gas to pass through and does not allow liquid to pass through. The functional membrane 160 is a membrane made of a waterproof and breathable material having waterproofness and breathability (moisture permeability) such as Gore-Tex (registered trademark) and TEMISH (registered trademark), and a membrane made of a non-woven fabric. ..

As described above, the pressure valve 150 fills the internal space S1 with the gas generated from each power storage element 400 at the time of abnormality, and when the internal space S1 becomes equal to or higher than a predetermined pressure, the internal space S1 and the external space S2 are filled. It becomes the second state to communicate. That is, in the event of an abnormality, the pressure valve 150 is in the second state, and the functional film 160 allows gas to pass through. Therefore, as shown by the white arrows in FIG. 4, the gas generated from each power storage element 400 is transferred to the exterior body 200. It can be discharged from the inner space S1 of the above to the outer space S2 through the communication passage W10.

FIG. 6 is a diagram showing a specific example for realizing a configuration in which a pressure valve is provided on the outer space side of the communication passage and a functional film is provided on the inner space side. FIG. 6 is an exploded perspective view of the communication portion 130A. The communication unit 130A described with reference to FIG. 6 is a form of the communication unit 130 shown in FIGS. 1 to 4.

FIG. 7 is a cross-sectional view taken along the line bb when the exploded perspective view of FIG. 6 is assembled.

As shown in FIGS. 6 and 7, the communication portion 130A is composed of the first member 131 and the second member 140. The first member 131 forms the first passage W11 on the inner side of the exterior body 200 in the communication passage W10. The second member 140 is connected to the outer side of the exterior body 200 of the first member 131. Further, the second member 140 forms a second passage W12 on the outer side of the exterior body 200 in the communication passage W10. Further, the second member 140 holds the pressure valve 150 in the second passage W12. Both the first member 131 and the second member 140 are formed in a cylindrical shape, and are joined so that the outer wall surface 141 of the second member 140 comes into contact with the inner wall surface 132 of the first member 131. The first member 131 has a female screw formed on the inner wall surface 132. The second member 140 has a male screw formed on the outer wall surface 141. That is, the first member 131 and the second member 140 are joined by screwing the inner wall surface 132 of the first member 131 and the outer wall surface 141 of the second member 140. Further, on the inner wall of the first member 131, an opposing portion 133 facing the end portion 142 on the internal space S1 side of the second member 140 in the X-axis direction is formed. The communication portion 130A further has a gasket 170 between the facing portion 133 of the first member 131 and the end portion 142 of the second member 140. The gasket 170 is an annular member for sealing the first member 131 and the second member, which is sandwiched between the portions where the first member 131 and the second member 140 are joined. The functional film 160 is held by being sandwiched between the facing portion 133 of the first member 131 and the end portion 142 of the second member 140 via the gasket 170.

Here, the detailed structure of the pressure valve 150, which is an umbrella valve, will be described with reference to FIG. 7. FIG. 7A is a cross-sectional view showing the pressure valve 150 in the first state, and FIG. 7B is a cross-sectional view showing the pressure valve 150 in the second state.

As shown in FIG. 7, the pressure valve 150 is composed of a shaft portion 151 and an umbrella-shaped umbrella portion 152 extending in the circumferential direction from the end portion of the shaft portion 151. An opening 143 and a through hole 144 are formed at the boundary between the internal space S1 and the external space S2 where the pressure valve 150 is provided. The through hole 144 is penetrated by the shaft portion 151 of the pressure valve 150. That is, the pressure valve 150 is fixed at a predetermined position by the shaft portion 151 penetrating the through hole 144. A plurality of openings 143 are formed around the through holes 144. The opening 143 is closed by the umbrella portion 152 of the pressure valve 150.

In the pressure valve 150, when the pressure difference between the internal space S1 and the external space S2 at normal times is less than a predetermined pressure difference, the umbrella portion 152 closes the opening 143 as shown in FIG. 7A. On the other hand, in the pressure valve 150, when the pressure in the internal space S1 is larger than the pressure in the external space S2 by a predetermined pressure difference or more at the time of abnormality, the umbrella portion 152 floats from the opening 143 as shown in FIG. 7B. It becomes a state, and the internal space S1 and the external space S2 are communicated with each other. That is, the pressure valve 150 is in the first state of closing the opening 143 when the pressure in the internal space S1 is equal to or less than the predetermined pressure, and when the pressure in the internal space S1 is larger than the predetermined pressure, the pressure valve 150 is inside in the opening 143. This is the second state in which the space S1 and the external space S2 are communicated with each other. In short, the pressure valve 150 adjusts the pressure so that the pressure in the internal space S1 approaches the pressure in the external space S2 of the exterior body 200 by entering the second state, and switches between the first state and the second state. It functions as a return type valve that can repeat the above. The "predetermined pressure" is a pressure higher than the pressure in the external space S2 of the exterior body 200. The predetermined pressure is determined by the shape or material of the pressure valve 150, and the pressure valve 150 can be selected according to the desired predetermined pressure.

According to the power storage device 100 according to the present embodiment, only when the pressure in the internal space S1 of the exterior body 200 rises above the pressure in the external space S2 of the exterior body 200 inside the exterior body 200 of the power storage device 100 A pressure valve 150 that communicates the space S1 and the external space S2 to adjust the pressure, and a functional film 160 that allows gas to pass through the internal space S1 side of the pressure valve 150 in the communication passage W10 are provided. .. Therefore, when the pressure in the internal space S1 of the exterior body 200 becomes larger than the predetermined pressure due to the generation of gas from the power storage element 400 in an abnormal situation or the like, the gas can pass through the functional film 160 and the pressure valve. Since the 150 is in the second state, the generated gas can be discharged to the external space S2. Further, since the pressure valve 150 is normally in the first state, the internal space S1 of the exterior body 200 can be kept in a sealed state, and foreign matter can enter the internal space S1 from the external space S2 of the exterior body 200. It is possible to prevent intrusion. That is, for example, when a predetermined water pressure is applied to the communication portion 130, such as when submerged in water, the inflow of water, which is difficult to prevent by the pressure valve 150, can be prevented by the functional film 160 that does not allow the liquid to pass through. Even when a predetermined water pressure is applied to the communication portion 130, it is possible to prevent water from flowing into the internal space S1 of the exterior body 200. Further, even if water injected at high pressure in a high-pressure car wash or the like invades, the pressure valve 150 can prevent the water from reaching the functional membrane 160. Therefore, it is possible to prevent the functional film 160 from being damaged by the water injected at high pressure. In this way, since the power storage device 100 can prevent water from entering the internal space S1 of the exterior body 200, it is possible to prevent a short circuit from occurring between the plurality of power storage elements.

Further, according to the power storage device 100 according to the present embodiment, the communication unit 130A includes a first member 131 that constitutes the inner side and a second member 140 that constitutes the outer side and holds the pressure valve 150. It is composed of two members, the functional film 160 is sandwiched between the first member 131 and the second member 140, and is held. Therefore, a configuration in which the functional film 160 is arranged on the internal space S1 side of the communication passage W10 rather than the pressure valve 150 can be realized with a simple configuration.

Further, according to the power storage device 100 according to the present embodiment, since the first member 131 and the second member 140 are joined by screwing, the first member 131 and the second member 140 are joined more firmly. Can be realized with a simple configuration.

Further, according to the power storage device 100 according to the present embodiment, the functional film 160 is held by being sandwiched between the end portion 142 of the second member 140 and the facing portion 133 of the first member 131. Therefore, stronger holding of the functional film 160 can be realized with a simple configuration.

Further, according to the power storage device 100 according to the present embodiment, since the gasket 170 is provided between the first member 131 and the second member 140, the joint portion between the first member 131 and the second member 140 is formed. , For example, when a predetermined water pressure is applied to the communication portion 130A when submerged in water, it is possible to prevent water from entering the inside of the exterior body 200 from the joint portion.

(Modification example)
(1)
In the power storage device 100 according to the above embodiment, as shown in FIG. 5, the communication portion 130 is formed so as to project outward from the exterior body 200 along the X-axis direction, but the present invention is limited to this. Absent. For example, as shown in FIG. 8, the communication portion 130 may be the communication portion 130B forming the communication passage W20 embedded in the exterior body 200. In this case, the communication portion 130B has a portion in which the portion where the pressure valve 150 and the functional film 160 are provided is embedded inside the exterior body 200, and a portion projecting to the outside of the exterior body 200. The latter portion is connected to, for example, the exhaust hose 500.

Further, as shown in FIG. 9, the communication portion 130 may be a communication portion 130C that forms a communication passage W30 such that the pressure valve 150 and the functional film 160 are not parallel to each other. That is, as shown in FIG. 9, the communication portion 130C may have a bent shape between the pressure valve 150 and the functional film 160.

(2)
In the power storage device 100 according to the above embodiment, the communication portion 130A is joined by screwing the inner wall surface 132 of the first member 131 and the outer wall surface 141 of the second member 140, but the present invention is not limited to this. In addition, the outer wall surface of the first member and the inner wall surface of the second member may be joined by screwing. In this case, the second member is formed with an facing portion facing the end portion on the internal space S1 side of the first member, and a functional film is formed between the end portion of the first member and the facing portion of the second member. May be held. Further, a gasket may be provided between the end portion of the first member and the facing portion of the second member.

That is, when the first member and the second member are joined by being screwed in, and one of the outer wall surface of the first member and the second member, and the other of the inner wall surface of the first member and the second member It suffices if they are joined by screwing.

Further, in the first member and the second member, when the outer wall surface of one member is fitted into the inner wall surface of the other member to be joined, the first member and the other of the first member and the second member are joined. An facing portion facing one end of the second member is formed, and the functional film is formed of one end of the first member and the second member and the other facing portion of the first member and the second member. Any configuration may be used as long as it is held by being sandwiched between the two.

(3)
In the power storage device 100 according to the above embodiment, the first member 131 and the second member 140 are joined by screwing, but the form of joining is not limited to screwing, but is bonding with an adhesive. It may be a fitting using a snap fit, a joining by press fitting, a joining using a flange, or a joining by welding / welding. , The form does not matter.

Even in the case of the modified example (3), as in the modified example (2), in the first member and the second member, the outer wall surface of one member is fitted into the inner wall surface of the other member and joined. The following configuration may be applied. That is, on the other side of the first member and the second member, an opposing portion facing one end of the first member and the second member is formed, and the functional film is one of the first member and the second member. The configuration held by being sandwiched between the end portion of the first member and the other opposing portion of the first member and the second member may be applied to the joining of the modified example (3).

(4)
In the power storage device 100 according to the above embodiment, the pressure valve 150 is provided on the outer space S2 side of the functional film 160, but the pressure valve 150 is not always required. That is, even if the exterior body 200 does not have the pressure valve 150, the communication portion is provided with a functional film that allows gas to pass through and does not allow liquid to pass through, so that water scattered in the communication portion is provided. It is possible to prevent foreign matter such as foreign matter from entering the inside of the exterior body from the communication passage, and preventing water from flowing into the inside of the exterior body from the communication passage when the vehicle is submerged. Of course, when both the functional film 160 and the pressure valve 150 are provided as in the power storage device 100 according to the above embodiment, foreign matter such as water is surely provided as compared with the configuration in which only the functional film 160 is provided. It is preferable because it can prevent the invasion due to the scattering of water and the inflow of water.

(5)
In the power storage device 100 according to the above embodiment, the exterior body 200 stores a plurality of power storage elements 400, but the present invention is not limited to this, and one power storage element 400 may be stored.

The present invention is a power storage device having a communication passage that can discharge the gas generated at the time of abnormality to the outside of the exterior body, and it is difficult for foreign matter or the like to enter the space inside the exterior body of the power storage device, and water from the communication passage. It is useful as a power storage device that can prevent intrusion.

100 Power storage device 110 External positive electrode terminal 120 External negative electrode terminal 130, 130A to 130C Communication part 131 First member 132 Inner wall surface 133 Opposing part 140 Second member 141 Outer wall surface 142 End part 143 Opening part 144 Through hole 150 Pressure valve 151 Shaft part 152 Umbrella 160 Functional film 170 Gasket 200 Exterior 210 Lid 220 Exterior body 300 Bus bar 310 Circuit board 400 Power storage element 410 Container 420 Positive electrode terminal 430 Negative electrode terminal 440 Safety valve 500 Exhaust hose S1 Internal space S2 External space W10, W20, W30 Linkage W11 1st passage W12 2nd passage

Claims (3)

With one or more power storage elements
An exterior body that houses one or more power storage elements, and
With
The exterior body has a communication portion that forms a communication passage for communicating the space inside the exterior body and the space outside the exterior body.
The communication part is
A functional membrane that allows gas to pass through and does not allow liquid to pass through,
A first series passage portion that is communicated with the internal space in the first direction and has a first series passage along the first direction.
It has a second communication portion which is communicated with the external space in a second direction substantially orthogonal to the first direction and has a second communication passage along the second direction.
The passageway is composed of a bent space.
The first series passage and the second series passage are connected by a bent portion of the series passage.
The communication portion is composed of a tubular first member arranged on the inner side of the exterior body in the communication passage and a tubular second member arranged on the outer side of the exterior body in the communication passage.
The functional film, wherein the first holding by Oite the one communicating portion sandwiched by the first member and the first direction by the second member, are arranged in a substantially parallel orientation with the second direction Power storage device. The first member and the second member have portions that overlap each other in the pipe radial direction, and are joined to each other at the overlapping portions.
Of the first member and the second member, the inner wall of the member arranged outside the pipe radial direction in the overlapping portion has an end of the member arranged inside the pipe radial direction in the overlapping portion. The facing portion facing the portion is formed, and the facing portion is formed.
The functional membrane is held between the end portion of the member arranged inside the pipe radial direction and the facing portion of the member arranged outside the pipe radial direction.
The power storage device according to claim 1. The first member and the second member are formed by screwing an inner wall surface of the member arranged outside in the pipe radial direction and an outer wall surface of the member arranged inside the pipe radial direction. Be joined
The power storage device according to claim 2.

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