Energy storage facilities

Abstract

An electrical storage facility (900) is provided with: an electrical storage device (1) comprising an electrical storage element (11), an emission path (140) of gas emitted from the electrical storage element (11), and an emission port (100a) of the gas; and an accommodating body (a rack (901)) that accommodates the electrical storage device (1). The accommodating body is provided with an exhaust part (a back cover (930)) having a wall section (932) facing the emission port (100a) and an exhaust outlet (an opening (935)) formed in the wall section (932) to discharge the gas. The exhaust part has a protrusion (933) protruding from the wall section (932) toward the emission port (100a).

Description

[Technical field]

[0001] The present invention relates to an electricity storage facility including an electricity storage element. [Background technology]

[0002] Conventionally, there is known an electricity storage facility that includes an electricity storage element and an exhaust path for gas discharged from the electricity storage element. Patent Document 1 discloses a facility (electricity storage facility) that includes a cell (electricity storage element) and a gas exhaust pipe (exhaust path) that is attached to a battery pack in which the cells are stacked and that exhausts gas generated from the cell. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2013-218790 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the electricity storage facility having the above-mentioned conventional configuration, there is a risk that the exhaust capacity for exhausting gas to the outside may decrease.

[0005] The present invention has an object to provide an electricity storage facility capable of suppressing a decrease in the capacity of exhausting gas to the outside. [Means for solving the problem]

[0006] An energy storage facility according to one embodiment of the present invention includes an energy storage element, an energy storage device having an exhaust path for gas discharged from the energy storage element and an emission port for the gas, and a housing for accommodating the energy storage device, the housing including an exhaust section having a wall portion facing the exhaust port and an exhaust outlet formed in the wall portion for exhausting the gas, and the exhaust section having a protrusion protruding from the wall portion toward the exhaust outlet.

[0007] The present invention can be realized not only as such an electricity storage facility, but also as a container, or a combination of the container with a discharge path and / or an electricity storage element. Effect of the Invention

[0008] According to the electricity storage facility of the present invention, it is possible to suppress a decrease in the capacity of exhausting gas to the outside. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a perspective view showing the appearance of an electricity storage facility according to an embodiment. [Diagram 2] FIG. 2 is a perspective view showing the appearance of the electricity storage facility according to the embodiment. [Diagram 3] FIG. 3 is a perspective view showing an external appearance of the electricity storage device according to the embodiment. [Figure 4] FIG. 4 is an exploded perspective view illustrating components of a power storage unit included in the power storage device according to the embodiment. [Diagram 5] FIG. 5 is an exploded perspective view showing each component of the path forming member according to the embodiment. [Figure 6] FIG. 6 is a perspective view showing the configuration of a path forming member and a rear cover (exhaust section) according to the embodiment. [Figure 7] FIG. 7 is a cross-sectional view showing the configuration of a path forming member and a rear cover (exhaust section) according to the embodiment. [Figure 8A] FIG. 8A is a diagram illustrating the effect of forming protrusions on the rear cover (exhaust portion) according to the embodiment. [Figure 8B] FIG. 8B is a diagram illustrating the effect of forming protrusions on the rear cover (exhaust portion) according to the embodiment. [Figure 9] FIG. 9 is a perspective view showing a configuration of a rear cover (exhaust portion) according to a modified example of the embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] In the above-described conventional energy storage equipment, when gas is discharged from the energy storage element, the contents of the energy storage element may be discharged together with the gas, causing objects to fly out of the discharge path. An exhaust port may be provided on the outlet side of the discharge path, but in this case, if an object is scattered from the discharge path, the object may block the exhaust port, reducing the exhaust capacity for discharging the gas to the outside.

[0011] The present invention was made by the present inventors by focusing on the above-mentioned problem, and has an object to provide an electricity storage facility that can suppress a decrease in the capacity of exhausting gas to the outside.

[0012] In order to achieve the above-mentioned object, an energy storage facility according to one embodiment of the present invention comprises an energy storage element, an energy storage device having an exhaust path for gas discharged from the energy storage element and an emission port for the gas, and a container for accommodating the energy storage device, wherein the container has an exhaust section having a wall portion facing the exhaust port and an exhaust outlet formed in the wall portion for exhausting the gas, and the exhaust section has a protrusion protruding from the wall portion toward the exhaust outlet.

[0013] According to this, in the energy storage facility, the exhaust section of the container that houses the energy storage device has an exhaust port for exhausting gas formed in a wall portion facing the gas exhaust port of the energy storage device, and has a protrusion that protrudes from the wall portion toward the exhaust port. In this way, the exhaust section of the container is provided with a protrusion that protrudes from the wall portion toward the exhaust port of the energy storage device. This makes it possible to prevent the object from blocking the exhaust port by being retained or cut by the protrusion, even if an object such as the contents of the energy storage element is exhausted from the exhaust port together with gas. Therefore, in the energy storage facility, it is possible to prevent a decrease in the ability to exhaust gas to the outside when gas is exhausted from the energy storage element.

[0014] The exhaust port may be a slit formed in the wall portion, and the protrusion may protrude toward the exhaust port on one side of the slit.

[0015] In the case where the protrusion is cylindrical and surrounds the periphery of the slit, if an object such as the contents of the energy storage element adheres to the protrusion, the object may block the slit. However, since the protrusion is configured to protrude from one side of the slit, even if the object adheres to the protrusion, a gap is likely to be created, and the object is prevented from blocking the slit. This makes it possible to prevent a decrease in the ability to exhaust gas to the outside.

[0016] The protrusion may protrude from an edge of the exhaust port toward the exhaust port.

[0017] According to this, in the exhaust section, the protrusion protrudes from the edge of the exhaust port, so that the protrusion is provided close to the exhaust port, which effectively prevents objects such as the contents of the energy storage device from blocking the exhaust port, and effectively prevents a decrease in the ability to exhaust gas to the outside.

[0018] The protrusion may be disposed so as to extend in a longitudinal direction of the exhaust port.

[0019] According to this, in the exhaust section, the protrusion is provided extending in the longitudinal direction of the exhaust port, so that objects such as the contents of the energy storage element are retained or cut by the protrusion along the longitudinal direction of the exhaust port, thereby preventing the object from blocking the exhaust port along the longitudinal direction of the exhaust port, and effectively preventing a decrease in the ability to exhaust gas to the outside.

[0020] The projection may be integrally formed with the wall portion.

[0021] According to this, in the exhaust section, the protrusion is formed integrally with the wall portion adjacent to the exhaust port, so that the protrusion can be easily formed by bending the protrusion from the wall portion, etc. The number of parts can be reduced compared to when the protrusion is formed separately from the wall portion. In this way, in the electricity storage facility, a reduction in the ability to exhaust gas to the outside can be suppressed with a simple configuration.

[0022] The exhaust port may extend in a direction intersecting a longitudinal direction of the exhaust port.

[0023] According to this, since the exhaust port of the exhaust unit is extended in a direction intersecting the longitudinal direction of the gas exhaust port, long objects are easily exhausted from the exhaust port in a direction intersecting the exhaust port. As a result, if the exhaust unit does not have a protrusion, the object is unlikely to pass through the exhaust port and is likely to remain at the exhaust port and block the exhaust port. Therefore, even in a configuration in which the exhaust port is extended in a direction intersecting the longitudinal direction of the exhaust port, by providing a protrusion on the exhaust unit, it is possible to prevent the object from blocking the exhaust port and to prevent a decrease in the ability to exhaust gas to the outside.

[0024] Hereinafter, a description will be given of an energy storage facility according to an embodiment of the present invention (including its modified examples) with reference to the drawings. The embodiments described below are all comprehensive or specific examples. The numerical values, shapes, materials, components, arrangement positions and connection forms of the components shown in the following embodiments are merely examples and are not intended to limit the present invention. The dimensions, etc. in each drawing are not strictly illustrated.

[0025] In the following description and drawings, the X-axis direction is defined as the arrangement direction of multiple energy storage devices arranged on one shelf, the arrangement direction of a pair of electrode terminals (positive and negative) in one energy storage element, the opposing direction of the short side surfaces of the container of the energy storage element, or the opposing direction of the long side surfaces of the exterior body of the energy storage unit. The Y-axis direction is defined as the direction in which the front cover and the rear cover face each other, the insertion direction in which the energy storage device is inserted into the shelf, the arrangement direction of multiple energy storage elements, the opposing direction of the long side surfaces of the container of the energy storage element, or the opposing direction of the short side surfaces of the exterior body of the energy storage unit. The Z-axis direction is defined as the arrangement direction of multiple shelves, the arrangement direction of the exterior body support body and the exterior body lid of the energy storage unit, the arrangement direction of the energy storage elements and the busbar, the arrangement direction of the container body and the lid of the energy storage element, or the up-down direction. The X-axis direction, the Y-axis direction, and the Z-axis direction intersect each other (orthogonal in this embodiment). Depending on the mode of use, the Z-axis direction may not be the up-down direction, but for the sake of convenience, the following description will be given assuming that the Z-axis direction is the up-down direction.

[0026] In the following description, the positive X-axis direction refers to the direction of the X-axis arrow, and the negative X-axis direction refers to the opposite direction to the positive X-axis direction. The same applies to the Y-axis direction and the Z-axis direction. Hereinafter, the positive Y-axis direction may also be referred to as a predetermined direction. Expressions indicating relative directions or attitudes, such as parallel and perpendicular, may also include cases where the direction or attitude is not strictly speaking the same. Two directions being perpendicular to each other not only mean that the two directions are completely perpendicular to each other, but also mean that the two directions are substantially perpendicular to each other, i.e., include a difference of, for example, about a few percent.

[0027] (Embodiment) [1. Description of the configuration of the power storage facility 900] First, a description will be given of the configuration of a power storage facility 900 according to this embodiment. The power storage facility 900 is a stationary storage battery panel that stores power generated by wind power generation, solar power generation, or the like, and supplies the power stably to external facilities.

[0028] 1 and 2 are perspective views showing the appearance of a power storage facility 900 according to this embodiment. Specifically, Fig. 1 is a perspective view showing the configuration of the power storage facility 900 when viewed from the front side, and Fig. 2 is a perspective view showing the configuration of the power storage facility 900 when viewed from the rear side.

[0029] 1 and 2, the power storage facility 900 includes a rack 901 and a plurality of power storage devices 1. The rack 901 is a rectangular parallelepiped container that contains the plurality of power storage devices 1, and is formed of metal members such as stainless steel, aluminum, aluminum alloy, iron, and plated steel plate. The rack 901 is not limited to being made of metal, and any member constituting the rack 901 may be made of resin or the like, and the shape of the rack 901 is not limited to being rectangular parallelepiped. The rack 901 is an example of a container that contains the power storage devices 1.

[0030] The rack 901 includes a rack body 910, a pair of front covers 920, a pair of rear covers 930, and a plurality of shelf boards 940. In Fig. 1, of the pair of front covers 920, one of the pair of front covers 920 (the one on the positive X-axis direction side) is not illustrated. In Fig. 2, of the pair of rear covers 930, one of the pair of rear covers 930 (the one on the positive X-axis direction side) is not illustrated. In Figs. 1 and 2, a case is illustrated in which a total of three power storage devices 1 are installed on the plurality of shelf boards 940, but the number of installed power storage devices 1 is not limited to this.

[0031] The rack body 910 is, for example, a rectangular metal box having openings on its front and rear sides. The opening on the front side of the rack body 910 is covered (closed) by a pair of front covers 920. The pair of front covers 920 are arranged side by side in the X-axis direction and are attached to the front part of the rack body 910 so as to open and close the opening on the front side of the rack body 910. The opening on the rear side of the rack body 910 is covered (closed) by a pair of rear covers 930. The pair of rear covers 930 are arranged side by side in the X-axis direction and are attached to the rear part of the rack body 910 so as to open and close the opening on the rear side of the rack body 910.

[0032] In addition to the multiple power storage devices 1, an electric circuit unit (not shown) connected to the multiple power storage devices 1 is housed inside the rack body 910. The electric circuit unit houses a circuit breaker, a control circuit, etc. The circuit breaker is disposed on a main circuit through which a main current flows for charging and discharging each power storage device 1, and the control circuit is connected to the board unit 20 (see FIG. 3) of each power storage device 1 by a signal line (not shown).

[0033] The front cover 920 and the rear cover 930 are provided with a plurality of openings 925 and 935 for ventilation, respectively. The openings 925 are slits arranged in the X-axis direction and the Z-axis direction in the front cover 920, and are long in the Z-axis direction. The openings 935 are slits arranged in the X-axis direction and the Z-axis direction in the rear cover 930, and are long in the Z-axis direction. The plurality of openings 925 and 935 ventilate the inside of the rack body 910, and prevent heat from building up inside the rack body 910.

[0034] The shelf boards 940 are support members that support multiple power storage devices 1, and the multiple shelf boards 940 are arranged at predetermined intervals in the Z-axis direction inside the rack body 910. Specifically, the shelf boards 940 are flat, rectangular members parallel to the XY plane, and multiple power storage devices 1 can be placed on one shelf board 940 in an array in the X-axis direction.

[0035] An opening 925 faces an end of the power storage device 1 placed on the shelf 940 on the negative side of the Y axis, and an opening 935 faces an end of the power storage device 1 on the positive side of the Y axis. This allows heat released from the power storage device 1 to be smoothly discharged to the outside of the rack 901 through the openings 925 and 935. In particular, the opening 935 is used as an exhaust port for discharging gas to the outside of the rack 901 when gas is discharged from the power storage device 1. In other words, the rear cover 930 is disposed in a predetermined direction (positive direction of the Y axis) of the power storage device 1 (path forming member 100 described later), and functions as an exhaust section in which an exhaust port is formed for discharging gas discharged from the power storage device 1 (path forming member 100).

[0036] The power storage device 1 is a device that can charge electricity from the outside and discharge electricity to the outside, and in this embodiment, has a substantially rectangular parallelepiped shape. The power storage device 1 is used for power storage purposes or power supply purposes. Specifically, the power storage device 1 is used as a stationary battery used in home or industrial power storage facilities. The power storage device 1 can be used as a battery for driving or starting an engine of a moving body such as an automobile, a motorcycle, a watercraft, a ship, a snowmobile, an agricultural machine, a construction machine, or a railway vehicle for an electric railway. Examples of the automobile include an electric vehicle (EV), a hybrid electric vehicle (HEV), a plug-in hybrid electric vehicle (PHEV), and a gasoline vehicle. Examples of the railway vehicle for the electric railway include a train, a monorail, and a linear motor car. The configuration of the power storage device 1 will be described in detail below.

[0037] [2. Description of the Configuration of the Energy Storage Device 1] Fig. 3 is a perspective view showing the appearance of the energy storage device 1 according to the present embodiment. Fig. 4 is an exploded perspective view showing each component of the energy storage unit 10 included in the energy storage device 1 according to the present embodiment.

[0038] As shown in Fig. 3 and Fig. 4, the energy storage device 1 includes an energy storage unit 10 and a board unit 20 attached to the energy storage unit 10. The energy storage unit 10 is a battery module (battery assembly) having a generally rectangular parallelepiped shape that is elongated in the Y-axis direction. Specifically, the energy storage unit 10 includes a plurality of energy storage elements 11, a bus bar frame 12, a plurality of bus bars 13, an exterior body 18 that contains these and is composed of an exterior body main body 14, an exterior body support body 15, and an exterior body cover body 17, and a path forming member 100. A cable 30 is connected to the energy storage unit 10. The energy storage unit 10 may include a restraining member (end plate, side plate, etc.) that restrains the plurality of energy storage elements 11.

[0039] [2.1 Description of the storage element 11] The energy storage element 11 is a secondary battery (single cell) capable of charging and discharging electricity, and more specifically, a non-aqueous electrolyte secondary battery such as a lithium ion secondary battery. The energy storage element 11 has a flat rectangular parallelepiped shape (rectangular shape), and in this embodiment, 16 energy storage elements 11 are arranged in the Y-axis direction. A flat, rectangular spacer 11d having heat insulating properties is arranged between adjacent energy storage elements 11. The shape, arrangement position, number, etc. of the energy storage element 11 are not particularly limited. The energy storage element 11 is not limited to a non-aqueous electrolyte secondary battery, and may be a secondary battery other than a non-aqueous electrolyte secondary battery, or may be a capacitor. The energy storage element 11 may not be a secondary battery, but may be a primary battery that can use stored electricity without the user having to charge it. The energy storage element 11 may be a pouch-type energy storage element.

[0040] Specifically, the energy storage element 11 includes a container 11a and a pair of electrode terminals 11b (positive and negative). The container 11a contains an electrode body, a pair of current collectors (positive and negative), and an electrolyte (non-aqueous electrolyte), but these are not shown in the figure. There is no particular limit to the type of electrolyte as long as it does not impair the performance of the energy storage element 11, and various electrolytes can be selected. Gaskets and the like are arranged between the container 11a and the electrode terminals 11b and the current collectors to improve insulation and airtightness, but these are also not shown in the figure. A spacer may be arranged on the side of the current collector, or an insulating sheet may be arranged to cover the outer surface of the container 11a.

[0041] The container 11a is a rectangular parallelepiped (angular) container, and includes a container body 11a1 (see FIG. 5) with an opening, and a lid 11a2 (see FIG. 5) that closes the opening of the container body 11a1. The container body 11a1 is a rectangular cylindrical member with a bottom that constitutes the main body of the container 11a, and has a pair of long side walls on both sides in the Y-axis direction, a pair of short side walls on both sides in the X-axis direction, and a bottom wall on the Z-axis negative side. The lid 11a2 is a flat rectangular member that constitutes the lid of the container 11a, and is disposed in the Z-axis positive direction of the container body 11a1. The lid 11a2 is provided with a gas exhaust valve 11c between the pair of electrode terminals 11b that exhausts gas and releases the pressure when the pressure inside the container 11a rises. In this embodiment, the multiple storage elements 11 are arranged in a position where the gas exhaust valves 11c face the same direction (Z-axis positive direction). The lid 11a2 may also be provided with a liquid injection portion for injecting an electrolyte into the container 11a. The material of the container 11a is not particularly limited, but is preferably a weldable metal such as stainless steel, aluminum, an aluminum alloy, iron, or a plated steel sheet.

[0042] The electrode terminals 11b are terminals (positive electrode terminal and negative electrode terminal) electrically connected to the positive electrode plate and the negative electrode plate of the electrode body via the current collector, and are formed of a metal (conductive) member such as aluminum, an aluminum alloy, copper, or a copper alloy. The pair of electrode terminals 11b are arranged to protrude upward (Z-axis positive direction) from the lid portion 11a2. The outermost electrode terminals 11b of the multiple storage elements 11 are connected to the cable 30, so that the storage device 1 can charge electricity from the outside and discharge electricity to the outside. The cable 30 is an electric wire (also called a main circuit cable, power cable, power cable, power line, or power line) through which a current (also called a charge / discharge current or a main current) for charging and discharging the storage device 1 (storage elements 11) flows, and includes a positive electrode power cable 31 on the positive electrode side and a negative electrode power cable 32 on the negative electrode side.

[0043] The electrode body is an electric storage element (power generating element) formed by laminating a positive electrode plate, a negative electrode plate, and a separator. The positive electrode plate is a positive electrode active material layer formed on a positive electrode base layer which is a current collector foil made of a metal such as aluminum or an aluminum alloy. The negative electrode plate is a negative electrode active material layer formed on a negative electrode base layer which is a current collector foil made of a metal such as copper or a copper alloy. As the active material used in the positive electrode active material layer and the negative electrode active material layer, any known material can be used as long as it can absorb and release lithium ions. The electrode body may be an electrode body of any shape, such as a wound type electrode body formed by winding electrode plates (positive electrode plate and negative electrode plate), a stack type electrode body formed by stacking a plurality of flat electrode plates, or a bellows type electrode body in which the electrode plates are folded in a bellows shape.

[0044] The current collectors are members (positive and negative current collectors) that are electrically connected to the electrode terminal 11b and the electrode body and have conductivity and rigidity. The positive current collector is made of aluminum or an aluminum alloy, etc., like the positive electrode base layer of the positive electrode plate, and the negative current collector is made of copper or a copper alloy, etc., like the negative electrode base layer of the negative electrode plate.

[0045] [2.2 Explanation of other components] The bus bar frame 12 is a flat rectangular member capable of electrically insulating the bus bars 13 from other members and regulating the position of the bus bars 13. The bus bar frame 12 is made of insulating materials such as polycarbonate (PC), polypropylene (PP), polyethylene (PE), polystyrene (PS), polyphenylene sulfide resin (PPS), polyphenylene ether (PPE (including modified PPE)), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polyether ether ketone (PEEK), tetrafluoroethylene-perfluoroalkyl vinyl ether (PFA), polytetrafluoroethylene (PTFE), polyether sulfone (PES), ABS resin, or composite materials thereof, ceramics, or metal with an insulating coating.

[0046] Specifically, the busbar frame 12 is placed above the multiple energy storage elements 11 and positioned relative to the multiple energy storage elements 11. A multiple number of busbars 13 are placed and positioned on the busbar frame 12. As a result, each busbar 13 is positioned relative to the multiple energy storage elements 11 and joined to the electrode terminals 11b of the multiple energy storage elements 11. The busbar frame 12 is provided with a path formation member arrangement portion 12a in which the path formation member 100 is arranged. The path formation member arrangement portion 12a is a portion that is arranged in the center of the busbar frame 12 in the X-axis direction and extends in the Y-axis direction.

[0047] Each bus bar 13 is disposed on the plurality of energy storage elements 11 (on the bus bar frame 12) and is a rectangular plate-like member that electrically connects the electrode terminals 11b of the plurality of energy storage elements 11 to each other. The bus bar 13 is formed of a metal such as aluminum, an aluminum alloy, copper, a copper alloy, or a nickel material. In this embodiment, the bus bar 13 connects the electrode terminals 11b of adjacent energy storage elements 11 to each other, thereby connecting 16 energy storage elements 11 in series. The plurality of bus bars 13 are divided into a bus bar group arranged in the Y-axis direction on the positive side of the X-axis and a bus bar group arranged in the Y-axis direction on the negative side of the X-axis, and the path forming member 100 is disposed between these two bus bar groups. The manner of connection of the energy storage elements 11 is not limited to the above, and any combination of series connection and parallel connection may be used.

[0048] A detection line 13a, which is a cable for detecting the state of each energy storage element 11, is connected to the bus bar 13 or the electrode terminal 11b of the energy storage element 11. The detection line 13a is an electric wire (also called a communication cable, control cable, communication line, or control line) for measuring the voltage or temperature of the energy storage element 11 or for balancing the voltage between the energy storage elements 11. A connector 13b connected to the board of the board unit 20 is connected to the end of the detection line 13a in the negative Y-axis direction. In other words, the detection line 13a transmits information such as the voltage and temperature of the energy storage element 11 to the board of the board unit 20 via the connector 13b. The detection line 13a also has a function of balancing the voltage between the energy storage elements 11 by discharging the energy storage element 11 with a high voltage through control of the board.

[0049] The exterior body 18 is a rectangular (box-shaped) housing (module case) that constitutes the exterior body of the energy storage unit 10. In other words, the exterior body 18 is disposed outside the energy storage elements 11, etc., and fixes the energy storage elements 11, etc. at predetermined positions to protect them from impacts and the like. The exterior body 18 has an exterior body main body 14 that constitutes the main body of the exterior body 18, an exterior body support 15 that supports the exterior body main body 14, and an exterior body lid 17 that constitutes the lid (outer lid) of the exterior body 18.

[0050] The exterior body 14 is a bottomed rectangular cylindrical housing with an opening. The exterior body 14 can be made of any insulating material that can be used for the bus bar frame 12 described above, such as PC, PP, or PE. A notch 14a through which the path forming member 100 penetrates is formed at the center of the upper portion of the end of the exterior body 14 on the Y-axis positive direction side. The notch 14a is a rectangular notch with an upper opening. The exterior body support 15 and the exterior body lid 17 are members that protect (reinforce) the exterior body 14. The exterior body support 15 and the exterior body lid 17 are made of metal members such as stainless steel, aluminum, aluminum alloy, iron, and plated steel sheet. The exterior body support 15 and the exterior body lid 17 may be made of members made of the same material or different materials.

[0051] The exterior body support 15 is a member that supports the exterior body main body 14 from below (Z-axis negative direction), and has a bottom 15a, a board unit attachment part 16, and connection parts 15b and 15c. The bottom 15a is a flat, rectangular part that constitutes the bottom of the energy storage device 1 and is parallel to the XY plane and extends in the Y-axis direction, and is disposed below the exterior body main body 14. The board unit attachment part 16 is a flat, rectangular part that stands in the Z-axis positive direction from the end of the bottom 15a on the Y-axis negative direction side, and the board unit 20 is attached to it. The connection part 15b is a part that is disposed at the end of the board unit attachment part 16 on the Z-axis positive direction side, protrudes in the Y-axis negative direction, and is connected to the exterior body cover 17. The connection part 15c is a part that stands in the Z-axis positive direction from the end of the bottom 15a on the Y-axis positive direction side, protrudes in the Y-axis positive direction, and is connected to the exterior body cover 17.

[0052] The exterior body cover 17 is a member disposed so as to cover the opening on the upper surface of the exterior body main body 14, and has a top surface portion 17a and connection portions 17b and 17c. The top surface portion 17a is a flat, rectangular portion extending in the Y-axis direction parallel to the XY plane and constituting the upper surface portion of the power storage device 1, and is disposed above the exterior body main body 14. The connection portion 17b is disposed at the end portion on the Y-axis negative side of the top surface portion 17a, extends in the Z-axis negative direction, and protrudes in the Y-axis negative direction, and is connected to the connection portion 15b of the exterior body support body 15. The connection portion 17c is a portion extending in the Z-axis negative direction from the end portion on the Y-axis positive side of the top surface portion 17a, protrudes in the Y-axis positive direction, and is connected to the connection portion 15c of the exterior body support body 15. A rectangular opening (not shown) through which the path forming member 100 penetrates is formed in the center of the upper end portion (end portion on the Z-axis positive direction side) of the connection portion 17c. In this way, the exterior body support 15 and the exterior body cover 17 are configured to sandwich the exterior body main body 14 from above and below, and are fixed by connecting the connection portions 15b and 15c to the connection portions 17b and 17c with screws or the like.

[0053] The path forming member 100 is disposed above the energy storage elements 11 (above the gas exhaust valves 11c) and is a member that forms a discharge path for the gas discharged from the gas exhaust valves 11c of the energy storage elements 11. Specifically, the path forming member 100 is a long rectangular tubular member that is disposed extending in the Y-axis direction across the energy storage elements 11 in the Y-axis direction and forms a discharge path through which the gas discharged from the gas exhaust valves 11c flows in a predetermined direction (positive direction of the Y-axis). The predetermined direction is the arrangement direction of the energy storage elements 11 and also the arrangement direction of the gas exhaust valves 11c of each of the energy storage elements 11. In this embodiment, the path forming member 100 is disposed above the bus bar frame 12 and in the path forming member arrangement portion 12a of the bus bar frame 12. The path forming member 100 is disposed so as to protrude from the end portion in the positive direction of the Y axis of the exterior body 18, and causes the gas discharged from the gas discharge valve 11c to flow in the positive direction of the Y axis and to be discharged from an opening portion (discharge port) on the positive side of the Y axis. A detailed description of the configuration of the path forming member 100 will be given later.

[0054] The board unit 20 is a device capable of monitoring the state of the energy storage element 11 included in the energy storage unit 10 and controlling the energy storage element 11, and has a circuit board or the like therein. In the present embodiment, the board unit 20 is a flat rectangular member attached to an end in the longitudinal direction of the energy storage unit 10, i.e., to a side surface on the Y-axis negative direction side of the energy storage unit 10. Specifically, the board unit 20 is attached to a board unit attachment portion 16 provided on an exterior body support 15 included in an exterior body 18 of the energy storage unit 10.

[0055] [3. Description of the configuration of the path forming member 100 and the rear cover 930 (exhaust section)] Next, the configurations of the path forming member 100 and the rear cover 930 (exhaust section) will be described in detail. Fig. 5 is an exploded perspective view showing each component when the path forming member 100 according to this embodiment is disassembled. Specifically, Fig. 5 is a perspective view showing the configuration of each component of the path forming member 100 and the energy storage element 11 when viewed from above, and shows the configuration of the components and the positional relationship between the components and the energy storage element 11. Fig. 5 shows one energy storage element 11 and one corresponding protrusion 113 (broken line portion), but the same is true for other parts.

[0056] Fig. 6 is a perspective view showing the configuration of the path forming member 100 and the rear cover 930 (exhaust section) according to this embodiment. Fig. 6 shows the configuration when the end of the path forming member 100 in the Y-axis positive direction is cut along a plane parallel to the XZ plane, and an enlarged view of a portion of the rear cover 930 facing the path forming member 100. Fig. 7 is a cross-sectional view showing the configuration of the path forming member 100 and the rear cover 930 (exhaust section) according to this embodiment. Specifically, Fig. 7 is a cross-sectional view showing the configuration when the configuration shown in Fig. 6 is cut along a plane passing through the center of the path forming member 100 in the Z-axis direction and parallel to the XY plane.

[0057] [3.1 Configuration of the path forming member 100] As shown in Figs. 5 to 7, the path forming member 100 has a bottom side member 110 and an upper side member 120. The bottom side member 110 is a member that is substantially U-shaped with an open side in the Z-axis positive direction when viewed from the Y-axis direction and extends in the Y-axis direction, and is disposed directly above the gas exhaust valves 11c of each energy storage element 11. The bottom side member 110 can be formed from any insulating member that can be used for the bus bar frame 12 described above, such as PC, PP, or PE. The bottom side member 110 may be formed from a conductive member such as a metal, as long as it has a configuration that does not affect the electrical insulation of the energy storage elements 11 and the like.

[0058] The bottom side member 110 is preferably formed of a non-flammable material having high heat resistance because the gas discharged from the gas exhaust valve 11c passes through it. In other words, the bottom side member 110 is preferably formed of a material that does not melt (or deform) at the temperature of the high-temperature gas discharged from the gas exhaust valve 11c. The bus bar frame 12 or the exterior body 14 is formed of PP, and the bottom side member 110 is formed of PPS or ceramics, etc., which have higher heat resistance than the bus bar frame 12 or the exterior body 14. When the bus bar frame 12 and the bottom side member 110 are integrally molded with a single member, it is necessary to mold all of them with a material having high heat resistance. However, in this embodiment, it is only necessary to form the bottom side member 110, which is separate from the bus bar frame 12, with a material having high heat resistance, so that the amount of material having high heat resistance used can be reduced.

[0059] The upper member 120 is a cover member disposed above the bottom member 110 and housed within the bottom member 110 to close an open portion of the bottom member 110. The upper member 120 is a member that is substantially U-shaped when viewed from the Y-axis direction and extends in the Y-axis direction with the Z-axis negative direction open, with the end in the Y-axis negative direction closed and the end in the Y-axis positive direction open. Thus, the upper member 120 and the bottom member 110 form a gas discharge path 140. The discharge path 140 is a gas passage extending in the Y-axis direction through which gas discharged from the gas discharge valve 11c of the energy storage element 11 flows, and the gas flows through the discharge path 140 in the Y-axis positive direction and is discharged from the end of the discharge path 140 in the Y-axis positive direction.

[0060] In this embodiment, the upper member 120 is formed to have the same length as the bottom member 110 in the Y-axis direction. The upper member 120 may be formed to be longer than the bottom member 110 in the Y-axis direction so that the end of the upper member 120 in the positive direction of the Y-axis protrudes from the bottom member 110, or vice versa (the upper member 120 is formed to be shorter than the bottom member 110). The upper member 120 is preferably formed of a member having higher heat dissipation properties than the bottom member 110, and is formed of a metal member such as stainless steel, aluminum, aluminum alloy, iron, plated steel sheet, etc.

[0061] Next, a more detailed configuration of the bottom member 110 and the upper member 120 will be described. The bottom member 110 has a bottom wall portion 111, a pair of first side walls 112, and a protruding portion 113. The upper member 120 has an upper wall portion 121, a pair of second side walls 122, and a front wall portion 123.

[0062] The bottom wall portion 111 is a flat, rectangular portion constituting the bottom wall of the path forming member 100, and is disposed along a discharge path 140 of the gas discharged from the gas discharge valve 11c at a position facing the upper wall portion 121. Specifically, the bottom wall portion 111 is disposed parallel to the XY plane and extending in the Y-axis direction at a position facing the lid portion 11a2 of the container 11a of the energy storage element 11. A plurality of holes 111a aligned in the Y-axis direction are formed in the bottom wall portion 111 at the center in the X-axis direction. The holes 111a are circular through-holes that penetrate the bottom wall portion 111 in the Z-axis direction and are disposed at a position facing the gas discharge valve 11c of the energy storage element 11. In this embodiment, 16 holes 111a are disposed aligned in the Y-axis direction corresponding to the 16 energy storage elements 11. The hole 111a has the same shape as the gas exhaust valve 11c when viewed from the Z-axis direction, but the shape of the hole 111a is not particularly limited. However, in order to prevent the hole 111a from blocking the opening of the gas exhaust valve 11c when the gas exhaust valve 11c is opened and to perform smooth gas exhaust, it is preferable that the hole 111a has the same shape as the gas exhaust valve 11c or a shape larger than the gas exhaust valve 11c when viewed from the Z-axis direction.

[0063] The first side wall portion 112 is a flat, rectangular portion constituting a side wall of the path formation member 100, and is connected to the bottom wall portion 111 and disposed along the discharge path 140. Specifically, the first side wall portion 112 is disposed parallel to the YZ plane and extending in the Y axis direction. In this embodiment, the pair of first side wall portions 112 are disposed outside the pair of second side wall portions 122, protruding from both ends of the bottom wall portion 111 in the X axis direction in the positive direction of the Z axis.

[0064] The protrusion 113 is a convex portion protruding from the periphery of the hole 111a in the negative Z-axis direction so as to surround the periphery of the hole 111a of the bottom wall portion 111, and a plurality of protrusions 113 are arranged at predetermined intervals in the Y-axis direction. In other words, the protrusion 113 is a portion protruding from the bottom wall portion 111 toward the lid portion 11a2 of the container 11a of the energy storage element 11 so as to surround the periphery of the gas exhaust valve 11c. In this embodiment, the protrusion 113 is a cylindrical protrusion protruding from the entire circumference of the hole 111a in the negative Z-axis direction so as to continuously surround the entire circumference of the hole 111a. The protrusion 113 is a cylindrical protrusion whose inner circumferential surface has the same shape as the hole 111a when viewed from the Z-axis direction, but may be a protrusion whose inner circumferential surface is cylindrical, elliptical, oblong, rectangular, or other shape different in size from the hole 111a. However, in order to suppress gas leakage when the gas exhaust valve 11c is opened, it is preferable that the inner surface of the protrusion 113 has the same shape as the hole 111a and the gas exhaust valve 11c, or a shape larger than the hole 111a and the gas exhaust valve 11c, when viewed from the Z-axis direction.

[0065] The upper wall portion 121 is a flat rectangular portion constituting the upper wall of the path formation member 100, and is disposed along an exhaust path 140 for gas exhausted from the gas exhaust valve 11c. Specifically, the upper wall portion 121 is disposed at a position opposite to the bottom wall portion 111, parallel to the XY plane, and extending in the Y-axis direction.

[0066] The second side wall portion 122 is a flat, rectangular portion constituting a side wall of the path forming member 100, and is connected to the upper wall portion 121 and disposed along the discharge path 140. Specifically, the second side wall portion 122 is disposed parallel to the YZ plane and extending in the Y-axis direction. In this embodiment, the pair of second side wall portions 122 are disposed inside the pair of first side wall portions 112, protruding in the negative Z-axis direction from both ends of the upper wall portion 121 in the X-axis direction. In order to suppress gas leakage from the discharge path 140, the pair of second side wall portions 122 have outer surfaces on both sides in the X-axis direction abutting the inner sides of the pair of first side wall portions 112, and have tips in the negative Z-axis direction abutting the bottom wall portion 111. The pair of second side wall portions 122 may be disposed outside the pair of first side wall portions 112.

[0067] The front wall portion 123 is a flat, rectangular portion constituting the front wall of the path formation member 100, and is disposed connected to the upper wall portion 121 and the second side wall portion 122. Specifically, the front wall portion 123 protrudes in the negative Z-axis direction from the ends in the negative Y-axis direction of the upper wall portion 121 and the pair of second side wall portions 122, and is disposed parallel to the XZ plane. The front wall portion 123 has a tip portion in the negative Z-axis direction abutting against the bottom wall portion 111 in order to suppress gas leakage from the exhaust path 140.

[0068] The upper wall portion 121 is disposed above the pair of first side wall portions 112. Therefore, the upper wall portion 121 is pressed downward by the top surface portion 17a of the exterior body cover 17. This pressing force presses the pair of second side wall portions 122 and the front wall portion 123 against the bottom wall portion 111, so that leakage of gas from the exhaust path 140 can be further suppressed. When gas is exhausted from the gas exhaust valve 11c, the upper member 120 may float because the upper member 120 receives the gas. In contrast, since the upper member 120 receives a downward pressing force from the exterior body cover 17, it is possible to suppress the upper member 120 from floating due to the exhaust of gas. Since a pressing force from the pair of second side wall portions 122 downwardly acts on the bottom member 110, the protruding portion 113 presses the multiple energy storage elements 11 downward. This can prevent a gap from being generated between protrusion 113 and cover 11a2. This pressing force can also prevent a plurality of energy storage elements 11 from being misaligned in the vertical direction.

[0069] [3.2 Configuration of rear cover 930 (exhaust section)] Next, the configuration of the rear cover 930 (exhaust section) will be described in detail. As shown in Fig. 6 and Fig. 7, the rear cover 930 (exhaust section) is disposed in a predetermined direction (positive direction of the Y axis) of the path forming member 100. The rear cover 930 has an opening 935 (exhaust port) through which gas discharged from the path forming member 100 is exhausted. Specifically, the rear cover 930 has the opening 935, a wall portion 932, and a protrusion 933.

[0070] The opening 935 is a rectangular opening (gas exhaust port) elongated in the Z-axis direction, disposed opposite the exhaust port 100a of the path forming member 100. The exhaust port 100a is a rectangular opening (gas exhaust port) elongated in the X-axis direction, provided at the edge of the path forming member 100 in the Y-axis plus direction. That is, the opening 935 extends in a direction (Z-axis direction) intersecting with the longitudinal direction (X-axis direction) of the gas exhaust port 100a of the path forming member 100. In this embodiment, a plurality of openings 935 are arranged side by side in the X-axis direction at a position opposite the exhaust port 100a. Specifically, as shown in FIG. 6, three openings 935 arranged side by side in the X-axis direction are arranged at a position overlapping with a region R facing the exhaust port 100a in the rear cover 930. The number of openings 935 arranged at a position overlapping with the region R is not particularly limited.

[0071] The wall portion 932 is a flat rectangular wall portion that is parallel to the XZ plane and elongated in the Z axis direction, and is disposed at a position adjacent to the opening portion 935 (exhaust port) in the X axis direction. In other words, the wall portion 932 is a wall portion without an opening that is disposed between two adjacent opening portions 935 in the X axis direction, and a plurality of the wall portions 932 are disposed side by side in the X axis direction. The wall portion 932 is a wall portion that faces the exhaust port 100a.

[0072] The protrusion 933 is disposed along the opening 935 (exhaust port), and is a flat, rectangular protrusion that is parallel to the YZ plane and long in the Z-axis direction, protruding from the wall 932 in the direction opposite to the predetermined direction (positive Y-axis direction). That is, the protrusion 933 is disposed extending in the longitudinal direction (Z-axis direction) of the opening 935. Specifically, the protrusion 933 protrudes from an edge 935a of the opening 935 in the direction opposite to the predetermined direction (negative Y-axis direction). The edge 935a is the edge of the opening 935 in the negative X-axis direction, and is also the edge of the wall 932 in the positive X-axis direction. The protrusion 933 is formed integrally with the wall 932. The opening 935 is formed by making a cut at a position adjacent to the wall 932 in the rear cover 930, and the portion disposed in the opening 935 is bent from the wall 932 in the negative Y-axis direction by approximately 90°, thereby forming the protrusion 933 protruding in the negative Y-axis direction. As a result, the protrusion 933 protrudes toward the exhaust port 100a on one side of an opening 935 (exhaust port) which is a slit formed in the wall portion 932.

[0073] The protrusions 933 are disposed at a position facing the discharge outlet 100a of the path forming member 100. In this embodiment, a plurality of protrusions 933 are disposed lined up in the X-axis direction at a position facing the discharge outlet 100a. That is, as shown in Fig. 6, two protrusions 933 lined up in the X-axis direction are disposed at a position overlapping with a region R of the rear cover 930 facing the discharge outlet 100a. The number of protrusions 933 disposed at the position overlapping with the region R is not particularly limited.

[0074] [4. Description of Effects] As described above, according to the energy storage facility 900 of the embodiment of the present invention, an exhaust port (opening 935) for exhausting gas is formed in a wall portion 932 facing the gas exhaust port 100a of the energy storage device 1 in the exhaust section (rear cover 930) of the container (rack 901) that accommodates the energy storage device 1. The exhaust port is an exhaust port through which gas exhausted from the path forming member 100 that forms the gas exhaust path 140 from the gas exhaust valve 11c of the energy storage element 11 is exhausted. The exhaust section is disposed along the exhaust port, and has a protrusion 933 that protrudes from the wall portion 932 adjacent to the exhaust port toward the exhaust port 100a. In this way, the exhaust section provided on the gas outlet side of the path forming member 100 is provided with a protrusion 933 that protrudes along the exhaust port from the wall portion 932 adjacent to the exhaust port toward the exhaust port 100a of the energy storage device 1. As a result, even if an object such as the contents of the energy storage element 11 is discharged from the outlet 100a of the path forming member 100 together with the gas, the object can be prevented from blocking the exhaust outlet by being retained by the protrusion 933 or being cut by the protrusion 933. This will be specifically described below.

[0075] 8A and 8B are diagrams for explaining the effect of forming protrusions 933 on rear cover 930 (exhaust portion) according to the present embodiment. Specifically, Fig. 8A and Fig. 8B are cross-sectional views showing rear cover 930 shown in Fig. 7.

[0076] 8A, when gas is discharged from the gas discharge valve 11c of the energy storage element 11 and flows through the discharge path 140 of the path formation member 100 together with a relatively large (long) object A, the object A gets caught on the protrusions 933 (protrusions 933a and 933b). As a result, the object A is disposed away from the opening 935, so that a space S can be secured between the object A and the opening 935, and the object A can be prevented from blocking the opening 935. In other words, when the space S is formed between the object A and the opening 935, the Z-axis direction side of the space S is easily opened, so that the gas discharge from the opening 935 can be prevented from being hindered.

[0077] As shown in Fig. 8B, in the state of Fig. 8A, object A may collide with protrusions 933 (protrusions 933a and 933b) and be cut into objects A1 and A2. In this case, the relatively large (long) object A is cut into relatively small (short) objects A1 and A2, and it is expected that objects A1 and A2 will get caught on protrusions 933a and 933b or fly out from protrusions 933a and 933b. This also makes it possible to prevent objects A1 and A2 from blocking opening 935.

[0078] For these reasons, in the electricity storage facility 900, when gas is discharged from the gas discharge valve 11c of the electricity storage element 11, a decrease in the capacity of discharging gas to the outside can be suppressed.

[0079] In the case where protrusion 933 is cylindrical and surrounds the periphery of slit (opening 935), if an object such as the contents of energy storage element 11 adheres to protrusion 933, the object may block the slit. However, since protrusion 933 is configured to protrude from one side of slit (opening 935), even if the object adheres to protrusion 933, a gap is likely to be created, and the object can be prevented from blocking the slit. This can prevent a decrease in the ability to exhaust gas to the outside.

[0080] In the exhaust section (rear cover 930), protrusion 933 protrudes from edge 935a of exhaust port (opening 935), so that protrusion 933 is provided close to the exhaust port. This effectively prevents objects such as the contents of energy storage element 11 from blocking the exhaust port, and effectively prevents a decrease in the ability to exhaust gas to the outside.

[0081] In the exhaust section (rear cover 930), protrusions 933 are provided extending in the longitudinal direction of the exhaust port (opening 935), so that objects such as the contents of the energy storage element 11 are retained or cut by protrusions 933 along the longitudinal direction of the exhaust port. This makes it possible to prevent the objects from blocking the exhaust port along the longitudinal direction of the exhaust port, and therefore makes it possible to effectively prevent a decrease in the ability to exhaust gas to the outside.

[0082] In the exhaust section (rear cover 930), the protrusion 933 is formed integrally with the wall section 932 adjacent to the exhaust port (opening 935), and thus the protrusion 933 can be easily formed, for example, by bending the protrusion 933 from the wall section 932. The number of parts can be reduced compared to when the protrusion 933 is formed separately from the wall section 932. In this way, in the electricity storage facility 900, a reduction in the ability to exhaust gas to the outside can be suppressed with a simple configuration.

[0083] Since the exhaust port (opening 935) of the exhaust section (rear cover 930) is extended in a direction intersecting the longitudinal direction of the gas exhaust port 100a of the path forming member 100, long objects are easily exhausted from the exhaust port 100a of the path forming member 100 in a direction intersecting the exhaust port. As a result, if the exhaust section does not have the protrusion 933, the object is unlikely to pass through the exhaust port and is likely to remain at the exhaust port and block the exhaust port. Therefore, even in a configuration in which the exhaust port is extended in a direction intersecting the longitudinal direction of the exhaust port 100a of the path forming member 100, by providing the protrusion 933 on the exhaust section, the object can be prevented from blocking the exhaust port, and the ability to exhaust gas to the outside can be prevented from decreasing. Since the exhaust port is extended in a direction intersecting the longitudinal direction of the exhaust port 100a, even if the object discharged from the exhaust port 100a remains at the exhaust port, the entire exhaust port is prevented from being blocked. This makes it possible to prevent the object from completely blocking the exhaust port, and to prevent a decrease in the ability to exhaust gas to the outside.

[0084] [5. Explanation of Variations] Although the power storage facility and the power storage facility according to the present embodiment have been described above, the present invention is not limited to the above embodiment. The embodiment disclosed herein is illustrative and not restrictive in all respects, and the scope of the present invention includes all modifications within the meaning and scope equivalent to the claims.

[0085] In the above embodiment, in the exhaust section (rear cover 930), the protrusion 933 is formed integrally with the wall section 932, but it may be formed separately from the wall section 932. Fig. 9 is a perspective view showing the configuration of the rear cover 930 (exhaust section) according to a modified example of the embodiment. Fig. 9 is a view corresponding to Fig. 6.

[0086] As shown in FIG. 9, a protrusion 936 is disposed on the exhaust section (rear cover 930) instead of the protrusion 933. In this modification, one protrusion 936 is disposed extending in the Z-axis direction on the side of a central opening 935 of five openings 935 (exhaust port). The protrusion 936 is disposed facing the exhaust ports 100a of the path forming members 100 of the plurality of power storage devices 1 aligned in the Z-axis direction, and prevents objects discharged from the plurality of exhaust ports 100a from blocking the exhaust ports facing the respective exhaust ports 100a. One protrusion 936 may be disposed extending in correspondence with all the power storage devices 1 aligned in the Z-axis direction, or multiple protrusions 936 may be disposed side by side in the Z-axis direction. The protrusion 936 may have a length approximately equal to that of the openings 935 in the Z-axis direction, and one protrusion 936 may be disposed corresponding to one power storage device 1. A plurality of protrusions 936 may be disposed side by side in the X-axis direction corresponding to the respective openings 935.

[0087] The protrusion 936 has a protrusion main body 936a and a protrusion mounting portion 936b. The protrusion main body 936a is the main body of the protrusion 936, and is a long, flat portion parallel to the YZ plane and extending in the Z-axis direction. The protrusion mounting portions 936b are disposed at both ends of the protrusion main body 936a in the Z-axis direction, and are portions for mounting the protrusion 936 to the wall portion 932. The protrusion mounting portion 936b is attached to the wall portion 932 by welding, screwing, adhesive, or the like. Depending on the length of the protrusion main body 936a, only one protrusion mounting portion 936b may be provided, or three or more protrusion mounting portions 936b may be provided.

[0088] According to this modification, since the protrusions 936 are formed separately from the wall portion 932, the rear cover 930 can be easily manufactured by a simple process of attaching the protrusions 936 to the wall portion 932. The rear cover 930 having the protrusions 936 can be easily manufactured by attaching the protrusions 936 to existing equipment. Although the number of parts increases by making the protrusions 936 separate from the wall portion 932, the increase in the number of parts can be suppressed by reducing the number of protrusions 936 as shown in FIG. 9.

[0089] In the above embodiment, the path forming member 100 is disposed so as to protrude from the exterior body 18. However, the entire path forming member 100 may not protrude from the exterior body 18, or the bottom member 110 or the upper member 120 may not protrude from the exterior body 18. The path forming member 100 may not be disposed on the bus bar frame 12. The path forming member 100 may be integrally formed (integrated) with the bus bar frame 12. In this case, a portion of the path forming member 100 that serves as a gas guide may be a wall of a wiring path provided on the bus bar frame 12, or the guide may not be provided, as long as the path forming member 100 has an exhaust port 100a. In this case, the above-mentioned predetermined direction may be a direction perpendicular to a plane in which the exhaust port 100a is defined.

[0090] In the above embodiment, the bottom member 110 of the path forming member 100 has a pair of first side wall portions 112, but the bottom member 110 does not have to have either one or both of the first side wall portions 112. The path forming member 100 does not have to have the bottom member 110.

[0091] In the above embodiment, the path forming member 100 is a long rectangular tubular member. However, the shape of the path forming member 100 is not particularly limited, and may be a cylindrical shape, an elongated cylindrical shape, an elliptical tubular shape, a polygonal tubular shape other than a rectangular shape, or the like, and may not be long. That is, the shape of the outlet 100a of the path forming member 100 may be an elliptical shape, an elliptical shape, a polygonal shape other than a rectangular shape, or the like that is long in the X-axis direction, may be a shape that is long in the Z-axis direction, or may be a shape that is not long, such as a square shape, a regular polygonal shape, a circle, or the like. The path forming member 100 may not be a configuration divided into a bottom side member 110 and an upper side member 120, but may be a tubular member in which the bottom side member 110 and the upper side member 120 are integrated.

[0092] In the above embodiment, the upper member 120 of the path forming member 100 has a front wall portion 123 and a pair of second side wall portions 122. However, the upper member 120 may not have one or both of the second side wall portions 122. The upper member 120 may not have the front wall portion 123, and gas may be discharged from both sides in the Y-axis direction. In this case, both sides in the Y-axis direction of the path forming member 100 may have the above-mentioned configuration, or only one side may have the above-mentioned configuration.

[0093] In the above embodiment, the power storage device 1 may not have the path forming member 100, and the space within the power storage device 1 may function as the discharge path 140.

[0094] In the above embodiment, the position and number of exhaust ports (openings 935) formed in the exhaust section (rear cover 930) are not particularly limited. Although no openings are formed in the wall section 932 of the exhaust section (rear cover 930), openings may be formed in the wall section 932. The exhaust section may not be the rear cover 930, but may be a panel separate from the rear cover 930.

[0095] In the above embodiment, the exhaust port (opening 935) is a rectangular opening that is elongated in the Z-axis direction. However, the shape of the opening 935 is not particularly limited, and may be an elliptical shape, an oval shape, a polygonal shape other than a rectangle, or the like that is elongated in the Z-axis direction, or a shape that is elongated in the X-axis direction, or a shape that is not elongated, such as a square shape, a regular polygonal shape, or a circle. In other words, the exhaust port (opening 935) does not have to be extended in a direction intersecting the longitudinal direction of the gas exhaust port 100a of the path formation member 100.

[0096] In the above embodiment, the protrusion 933 of the exhaust section (rear cover 930) is arranged to protrude from the edge 935a of the exhaust port (opening 935) in the negative X-axis direction and to extend continuously in the longitudinal direction of the exhaust port. However, the protrusion 933 may protrude from the edge of the exhaust port in the positive X-axis direction, or from the edge of the exhaust port in the positive Z-axis direction or the negative Z-axis direction. The protrusion 933 may protrude from a position near the exhaust port but spaced apart from the exhaust port, may be arranged intermittently along the exhaust port, or a short protrusion 933 may protrude in a direction along the exhaust port. The protrusion 933 may not be linear along one edge of the exhaust port, but may be an L-shaped portion along two edges of the exhaust port, a U-shaped portion along three edges of the exhaust port, or a ring-shaped (O-shaped) portion along four edges of the exhaust port. If the protrusion 933 is annular, in order to prevent the exhaust port from being blocked by an object, it may be formed intermittently by providing a slit or the like rather than being formed continuously along the entire circumference of the exhaust port.

[0097] In the above embodiment, the protrusion 933 protrudes from the wall 932 in the negative Y-axis direction (direction perpendicular to the wall 932) which is the direction opposite to the predetermined direction. However, the protrusion 933 may protrude in a direction inclined from the negative Y-axis direction (direction inclined from the direction perpendicular to the wall 932). In other words, the above "direction opposite to the predetermined direction" may be any direction facing the negative Y-axis direction, and is a concept that includes not only the negative Y-axis direction, but also a direction inclined from the negative Y-axis direction (a direction inclined from the direction perpendicular to the wall 932).

[0098] Any combination of the components included in the above-described embodiment and its modified examples is also included within the scope of the present invention.

[0099] The present invention can be realized not only as such an electricity storage facility 900, but also as a housing (rack 901), or a combination of a housing and a path forming member 100 (discharge path 140) and / or an electricity storage element 11. [Industrial Applicability]

[0100] The present invention can be applied to an electricity storage facility equipped with electricity storage elements such as lithium ion secondary batteries. [Explanation of symbols]

[0101] 1. Energy storage device 10 Energy storage unit 11 Energy storage element 11a Container 11a1 Container body 11a2 Lid 11b Electrode terminal 11c Gas exhaust valve 11d Spacer 12 Busbar frame 12a Path forming member arrangement section 13 Busbar 13a Detection line 13b Connector 14 Exterior body 14a Notch 15 Exterior body support 15a bottom 15b, 15c, 17b, 17c Connections 16 Board unit mounting section 17 Exterior body cover 17a Top section 18 Exterior body 20 Circuit Board Unit 30 Cable 31 Positive power cable 32 Negative power cable 100 Path forming member 100a outlet 110 Bottom member 111 Bottom wall 111a Hole 112 First side wall part 113 Protrusion 120 Upper member 121 Upper wall section 122 Second side wall part 123 Front wall 140 Emission Path 900 Energy Storage Equipment 901 Rack 910 Rack body 920 Front cover 925, 935 opening 930 Back cover 932 Wall section 933, 933a, 933b, 936 protrusion 935a edge 940 Shelf

Claims

1. an electricity storage device including an electricity storage element, a discharge path for gas discharged from the electricity storage element, and a discharge port for the gas; A housing that houses the power storage device, the container includes an exhaust unit having a wall portion facing the exhaust port and an exhaust port formed in the wall portion for exhausting the gas, The exhaust portion has a protrusion that protrudes from the wall portion toward the exhaust port. Energy storage equipment.

2. the exhaust port is a slit formed in the wall portion, The protrusion protrudes toward the outlet on one side of the slit. The power storage facility according to claim 1.

3. The protrusion protrudes from an edge of the exhaust port toward the exhaust port. The power storage facility according to claim 1 or 2.

4. The protrusion is disposed so as to extend in the longitudinal direction of the exhaust port. The storage facility according to any one of claims 1 to 3.

5. The protrusion is integrally formed with the wall portion. The storage facility according to any one of claims 1 to 4.

6. The exhaust port extends in a direction intersecting the longitudinal direction of the exhaust port. The storage facility according to any one of claims 1 to 5.

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