Power storage board and power storage facility

Abstract

This power storage board comprises: a power storage device provided with a power storage element; a housing that accommodates the power storage device; a flow path forming member that forms a flow path for discharging gas discharged from the power storage device to the outside of the housing; and a fire extinguishing agent that is disposed in the housing on the outside of the flow path forming member and in the same space as the space in which the power storage device is accommodated.

Description

Storage panels and storage equipment

[0001] The present invention relates to a power storage board and a power storage facility.

[0002] Patent Document 1 discloses an electrochemical device including a sealed container that houses a plurality of single cells, a pressure release valve that is provided in the sealed container and that opens the inside of the sealed container to the outside when the internal pressure of the sealed container reaches a predetermined value or higher, and an aerosol fire extinguishing unit that generates an aerosol by combustion and mixes the aerosol into gas that is sprayed out from the pressure release valve.

[0003] International Publication No. 2017 / 213132

[0004] The electrochemical device disclosed in Patent Document 1 mixes an aerosol into the gas (gas containing electrolyte vapor) inside a sealed container housing cells when the gas is ejected from the sealed container through a pressure release valve to the outside of the sealed container. This prevents the gas from igniting and extinguishes any ignited gas. In this electrochemical device, a fire does not immediately break out due to a lack of oxygen inside the sealed container. In other words, Patent Document 1 does not take into consideration sealed containers containing a combustible amount of oxygen. Therefore, if the sealed container contains a combustible amount of oxygen, the configuration of this electrochemical device may cause thermal effects on the cells placed inside the sealed container.

[0005] The present invention was made by the inventor of the present application by focusing on the above-mentioned problem, and aims to provide a storage board and storage equipment that can suppress the thermal impact on the storage device placed within the housing.

[0006] A storage battery board according to one embodiment of the present invention comprises a storage device having a storage element, a housing that houses the storage device, a flow path forming member that forms a flow path for discharging gas discharged from the storage device to the outside of the housing, and a fire extinguishing agent that is placed within the housing, outside the flow path forming member, and in the same space as the space in which the storage device is housed.

[0007] An aspect of the present invention provides an electric storage facility comprising: a power storage board having an electric storage device; a housing for accommodating the power storage board; a flow path forming member for forming a flow path for discharging gas discharged from the power storage board to the outside of the housing; and a fire extinguishing agent disposed within the housing, outside the flow path forming member, and in the same space as the space in which the power storage board is accommodated.

[0008] According to the power storage panel or the like of the present invention, it is possible to suppress the thermal influence on the power storage device disposed in the housing.

[0009] FIG. 1 is a perspective view showing a configuration of a power storage board according to an embodiment. FIG. 2 is a cross-sectional view showing an internal configuration of a housing of the power storage board according to an embodiment. FIG. 3 is a perspective view showing the appearance of a power storage device, a flow path forming member, and a fire extinguishing agent according to an embodiment. FIG. 4 is an exploded perspective view showing each component when a power storage unit included in a power storage device according to an embodiment is disassembled. FIG. 5 is a cross-sectional view showing a configuration of an exhaust path forming portion included in a power storage unit according to an embodiment. FIG. 6 is a cross-sectional view showing an internal configuration of a housing of a power storage board according to a first modification of the embodiment. FIG. 7 is a cross-sectional view showing an internal configuration of a housing of a power storage board according to a second modification of the embodiment. FIG. 8 is a cross-sectional view showing an internal configuration of a housing of a power storage board according to a third modification of the embodiment. FIG. 9 is a cross-sectional view showing an internal configuration of a housing of a power storage board according to a fourth modification of the embodiment. FIG. 10 is a schematic diagram showing a configuration of a power storage facility according to a fifth modification of the embodiment.

[0010] (1) A storage board according to one aspect of the present invention includes a storage device having a storage element, a housing that houses the storage device, a flow path forming member that forms a flow path for discharging gas discharged from the storage device to the outside of the housing, and a fire extinguishing agent that is disposed within the housing, outside the flow path forming member, and in the same space as the space in which the storage device is housed.

[0011] A power storage board according to one embodiment of the present invention includes a flow path forming member that forms a flow path through which gas discharged from a power storage device is discharged to the outside of a housing, and a fire extinguishing agent disposed within the housing, outside the flow path forming member and in the same space as the space in which the power storage device is housed. As a result, when gas is discharged from the power storage device due to thermal runaway of an energy storage element or the like, the gas can be discharged to the outside of the housing by the flow path forming member, thereby preventing the power storage device in the housing from being thermally affected by the gas. Because the fire extinguishing agent is disposed in a space that is not connected to the flow path within the flow path forming member, it is possible to prevent the fire extinguishing agent from being discharged to the outside of the housing. By disposing the fire extinguishing agent in the same space in the housing as the space in which the power storage device is housed, it is possible to prevent the power storage device from being thermally affected. In this way, the power storage board can prevent thermal effects on the power storage device disposed within the housing.

[0012] (2) In the storage panel described in (1) above, the fire extinguishing agent may be disposed adjacent to the storage device or the flow path forming member.

[0013] According to the storage panel described in (2) above, the extinguishing agent is arranged adjacent to the storage device or the flow path forming member, so that the extinguishing agent reacts with the heat of the storage device or the heat of the gas passing through the flow path forming member, thereby allowing the extinguishing agent to diffuse within the housing.

[0014] (3) In the storage board described in (1) or (2) above, the flow path forming member may include a first flow path forming member connected to a first storage device as the storage device, a second flow path forming member connected to a second storage device as the storage device, and a third flow path forming member connected to the first flow path forming member and the second flow path forming member, and the extinguishing agent may be arranged adjacent to the third flow path forming member.

[0015] According to the storage panel described in (3) above, the extinguishing agent is disposed adjacent to the third flow path forming member connected to the first flow path forming member and the second flow path forming member. In this way, by disposing the extinguishing agent at the third flow path forming member where the first flow path forming member and the second flow path forming member join together, the configuration can be simplified.

[0016] (4) In the storage panel according to any one of (1) to (3) above, the fire extinguishing agent may be arranged along a wall of the housing.

[0017] According to the storage panel described in (4) above, the fire extinguishing agent is arranged along the wall of the housing, thereby making it possible to save space.

[0018] (5) The storage board described in any one of (1) to (4) above may further include a detection unit that detects heat, gas, or smoke, and the detection unit may release the fire extinguishing agent into the housing when it detects heat, gas, or smoke above a predetermined threshold.

[0019] According to the storage panel described in (5) above, when the detection unit detects heat, gas, or smoke equal to or greater than a predetermined threshold, the detection unit releases a fire extinguishing agent into the housing, thereby dispersing the fire extinguishing agent within the housing. In other words, when heat, gas, or smoke equal to or greater than a predetermined threshold is generated during thermal runaway of the storage element, the fire extinguishing agent can be dispersed within the housing.

[0020] (6) An aspect of the present invention provides an electric storage facility that includes a power storage board having an electric storage device, a housing that houses the power storage board, a flow path forming member that forms a flow path for discharging gas discharged from the power storage board to the outside of the housing, and a fire extinguishing agent that is disposed within the housing, outside the flow path forming member, and in the same space as the space in which the power storage board is housed.

[0021] According to the power storage facility of one embodiment of the present invention, the same effects as those of the above-described power storage panel can be achieved.

[0022] Hereinafter, with reference to the drawings, a description will be given of a storage board and the like according to an embodiment of the present invention (including its modified examples). The embodiments described below are all comprehensive or specific examples. The numerical values, shapes, materials, components, component placement and connection configurations, manufacturing processes, and the order of manufacturing processes shown in the following embodiments are examples and are not intended to limit the present invention. In each drawing, dimensions and the like are not strictly illustrated. In each drawing, the same or similar components are designated by the same reference numerals.

[0023] In the following description and drawings, the X-axis direction is defined as the width direction of the storage board housing, the direction in which the two side walls of the housing face each other, the arrangement direction of multiple storage devices on the shelf of the housing, the short-side direction of the storage device, the arrangement direction of a pair of terminals (positive and negative) of one storage element, or the direction in which the short sides of the containers of the storage elements face each other. The Y-axis direction is defined as the depth direction of the storage board housing, the direction in which the front and rear walls of the housing face each other, the longitudinal direction of the storage device, the arrangement direction of multiple storage elements included in the storage element, or the direction in which the long sides of the containers of the storage elements face each other. The Z-axis direction is defined as the height direction of the storage board housing, the direction in which the top and bottom walls of the housing face each other, the arrangement direction of the storage devices sandwiched between the shelf of the housing, the arrangement direction of the main body and lid of the containers of the storage elements, and the vertical direction or up-down direction. The X-axis direction, Y-axis direction, and Z-axis direction intersect each other (orthogonal in this embodiment).

[0024] 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 direction opposite to the positive X-axis direction. Simply referring to the X-axis direction refers to both or either of the positive and negative X-axis directions. Unless otherwise specified, the center and end portions of a component in the X-axis direction refer to the portions located in the center and end portions when the component is divided into thirds along the X-axis direction. The same applies to the Y-axis and Z-axis directions. Expressions indicating relative directions or orientations, such as parallel and perpendicular, also include cases where the direction or orientation is not strictly the same. Two directions being parallel (or perpendicular) not only means that the two directions are completely parallel (or perpendicular), but also means that the two directions are substantially parallel (or perpendicular), i.e., there is a difference of a few percent. In the following description, the term "insulation" means "electrical insulation." The volume resistivity of an insulating material is 1×10 ６ Ωm or more is preferable, and 1×10 ７ Ωm or more is more preferable, and 1×10 １０ More preferably, it is Ωm or more.

[0025] (Embodiment) [1 Description of Electric Storage Board 10] The configuration of electric storage board 10 in this embodiment will be described. Fig. 1 is a perspective view showing the configuration of electric storage board 10 according to this embodiment. In Fig. 1, the internal configuration of housing 100 of electric storage board 10 is shown by dashed lines. Fig. 2 is a cross-sectional view showing the internal configuration of housing 100 of electric storage board 10 according to this embodiment. Fig. 2 cuts housing 100 of electric storage board 10 shown in Fig. 1 along a plane parallel to the YZ plane, and shows the configuration of electric storage device 200, flow path forming member 300, and fire extinguishing agent 400.

[0026] The power storage panel 10 is a device that charges and discharges electricity and supplies it to an external power load. The power storage panel 10 is a stationary battery used for business or home purposes, and is used for power storage or power supply purposes. The power storage panel 10 is a stationary electrical panel (power storage device panel, power storage element panel, storage battery panel) that stores various types of power, such as power from a commercial power system, power generated by a generator, wind power generation, or solar power generation, and regenerative power in a railway system, and stably supplies power to external equipment. The power storage panel 10 is installed in a large mobile object such as a ship or a railway vehicle for an electric railway, and can be used as a battery for driving or starting the engine of the large mobile object. Examples of the above-mentioned electric railway vehicle include electric trains, monorails, linear motor cars, and hybrid trains equipped with both a diesel engine and an electric motor.

[0027] In the present embodiment, the power storage board 10 is an outdoor-spec facility that is installed outdoors (can be installed outdoors) and has the dustproof and waterproof properties required for outdoor installation. Specifically, the power storage board 10 has an IP2X, IP3X, IP4X, IP5X, or IP6X dustproof property and an IPX3, IPX4, IPX5, IPX6, IPX7, or IPX8 waterproof property in the protection rating (IP code) defined by the IEC (International Electrotechnical Commission) standards.

[0028] As shown in FIGS. 1 and 2 , the power storage panel 10 has a rectangular parallelepiped shape. The power storage panel 10 includes a housing 100, a power storage device 200, a flow path forming member 300, and a fire extinguishing agent 400. In this embodiment, within the housing 100, a plurality of (six) power storage devices 200 are arranged in the X-axis direction and in multiple tiers in the Z-axis direction. One flow path forming member 300 and one fire extinguishing agent 400 are arranged for each power storage device 200. The number of power storage devices 200, flow path forming members 300, and fire extinguishing agents 400 arranged in the X-axis direction and the number of tiers arranged in the Z-axis direction are not particularly limited. In addition to these components, the power storage panel 10 also includes electrical wires and the like connecting the multiple power storage devices 200 to each other; however, these are not shown in the drawings and detailed description will be omitted. The multiple power storage devices 200 may all be connected in series, may be connected in a combination of series and parallel, or may all be connected in parallel. The power storage panel 10 may include a power converter, a copper bar, a breaker, other electrical equipment (electrical components), and the like.

[0029] Specifically, in the multiple power storage devices 200 included in the power storage panel 10, a flow path forming member 300 is connected to the end of each power storage device 200 in the positive Y-axis direction, and a fire extinguishing agent 400 is disposed in each flow path forming member 300. In this embodiment, the end of the flow path forming member 300 in the positive Y-axis direction protrudes from the housing 100 (see FIG. 2). In other words, the multiple power storage devices 200, at least a portion of the flow path forming member 300 corresponding to each power storage device 200, and the fire extinguishing agent 400 are accommodated inside the housing 100. First, the configuration of the housing 100 will be described in detail.

[0030] [1.1 Description of the Housing 100] The housing 100 is a rectangular parallelepiped (box-shaped) container (shelf, rack). As described above, the housing 100 accommodates the power storage device 200, at least a portion of the flow path forming member 300, and the fire extinguishing agent 400. In this embodiment, the housing 100 has a sealed structure. The term "sealed structure" refers to a sealed structure that provides dustproofness and waterproofness as described above, and allows for small gaps. The housing 100 has an internal space divided into multiple sections, and multiple power storage devices 200 and the like are accommodated within the divided sections. The housing 100 is formed of a metal such as stainless steel, aluminum, an aluminum alloy, iron, or plated steel sheet. The housing 100 may be formed of a material other than metal (such as resin), but is preferably formed of a material with high strength, heat resistance, and flame retardancy. The housing 100 includes side walls 110 and 120 , a front wall 130 , a rear wall 140 , a bottom wall 150 , a top wall 160 , a first shelf 170 , and a second shelf 180 .

[0031] The side walls 110 and 120, the front wall 130, the rear wall 140, the bottom wall 150, and the top wall 160 are flat, rectangular walls that cover all six sides of the housing 100. Specifically, the side wall 110 is a wall facing the positive X-axis direction of the housing 100, and the side wall 120 is a wall facing the negative X-axis direction of the housing 100. The front wall 130 is a wall facing the negative Y-axis direction of the housing 100. The front wall 130 is a cover member (door) that can be opened and closed (opened and closed freely) to close an opening on the surface (front face) of the housing 100 facing the negative Y-axis direction. The rear wall 140 is a wall facing the positive Y-axis direction of the housing 100. The bottom wall 150 is a wall facing the negative Z-axis direction of the housing 100. The top wall 160 is a wall facing the positive Z-axis direction of the housing 100.

[0032] A through hole may be formed in any wall of the housing 100, through which wiring or piping (main circuit wiring, signal lines, grounding lines, commercial AC wiring, control power lines, cooling piping, heating piping, fire extinguishing piping, or the like) passes. In this case, the through hole is sealed with a cover or the like, thereby maintaining the above-mentioned dustproof and waterproof properties. An air conditioning unit may be disposed above the upper wall 160, and an air vent for the air conditioning unit to take in and exhaust air may be formed in the upper wall 160. In this case, the air vent is sealed from the air conditioning unit, thereby maintaining the above-mentioned dustproof and waterproof properties.

[0033] The first shelf 170 and the second shelf 180 are walls that divide the space inside the housing 100. Each power storage device 200 is arranged in the housing 100 by being supported by the first shelf 170 and the second shelf 180 within the space divided by the first shelf 170 and the second shelf 180. A plurality of power storage devices 200 are lined up in the X-axis direction on the first shelf 170, and a plurality of power storage devices 200 are lined up in the X-axis direction on the second shelf 180. In this manner, the plurality of power storage devices 200 are arranged adjacent to each other in the X-axis direction and the Z-axis direction. "Areas adjacent to each other in the X-axis direction" refers to a state in which the power storage devices 200 are arranged relatively close to each other in the X-axis direction, and includes cases in which the power storage devices 200 are in contact with each other in the X-axis direction and cases in which the power storage devices 200 are in close proximity but not in contact with each other in the X-axis direction. In this embodiment, the plurality of power storage devices 200 are arranged with a gap in the X-axis direction (close to each other but not in contact with each other). The same applies to the Z-axis direction.

[0034] A space is formed in the negative Z-axis direction of the first shelf 170, where the power storage devices 200, flow path forming members 300, and fire extinguishing agent 400 are not disposed. An electric unit (electrical components) that controls all of the power storage devices 200 and other components are disposed in this space. The first shelf 170 and the second shelf 180 are flat, rectangular wall portions. An opening (not shown) is formed in the second shelf 180, allowing gases such as air to pass through the opening. In this embodiment, the first shelf 170 does not have an opening, preventing gases such as air from passing through the first shelf 170. However, an opening may be formed in the first shelf 170. The shapes of the first shelf 170 and the second shelf 180 are not particularly limited and may be narrow, plate-like, or rod-like members such as beams. The power storage devices 200, flow path forming members 300, and fire extinguishing agent 400 may also be disposed in the space in the negative Z-axis direction of the first shelf 170.

[0035] Next, the configurations of the power storage device 200, the flow path forming member 300, and the fire extinguishing agent 400 will be described in detail. FIG. 3 is a perspective view showing the appearance of the power storage device 200, the flow path forming member 300, and the fire extinguishing agent 400 according to the present embodiment. The multiple power storage devices 200 included in the power storage panel 10 have the same configuration, the multiple flow path forming members 300 have the same configuration, and the multiple fire extinguishing agents 400 have the same configuration. Therefore, FIG. 3 shows one power storage device 200 included in the power storage panel 10, and one flow path forming member 300 and one fire extinguishing agent 400 corresponding to that single power storage device 200. FIG. 4 is an exploded perspective view showing each component of the power storage unit 210 included in the power storage device 200 according to the present embodiment when disassembled. FIG. 4 also shows the flow path forming member 300. FIG. 5 is a cross-sectional view showing the configuration of an exhaust path forming portion 219 included in the power storage unit 210 according to the present embodiment. FIG. 5 shows a cross section of the exhaust path forming portion 219 arranged on the power storage element 211, taken along a plane passing through the center of the exhaust path forming portion 219 and parallel to the YZ plane.

[0036] [1.2 Description of Energy Storage Device 200] First, the configuration of the energy storage device 200 will be described in detail. The energy storage device 200 is a device that can charge with electricity from an external source and discharge electricity to an external source. As shown in FIG. 3 , the energy storage device 200 includes an energy storage unit 210 and a board unit 220 attached to the energy storage unit 210. The board unit 220 is a device that can monitor the states, such as the charged and discharged states, of the energy storage elements 211 included in the energy storage unit 210 and control the energy storage elements 211. The board unit 220 includes electrical devices such as a circuit board (CMU: Cell Monitoring Unit) therein. In this embodiment, the board unit 220 is a flat, rectangular member that is attached to an end of the energy storage unit 210 in the longitudinal direction, i.e., to a side surface of the energy storage unit 210 facing in the negative Y-axis direction, thereby being disposed at the end of the energy storage device 200 facing in the negative Y-axis direction.

[0037] The energy storage unit 210 is a battery module (battery assembly) having a generally rectangular parallelepiped shape and elongated in the Y-axis direction. The longitudinal direction of the energy storage unit 210 (energy storage device 200) is the Y-axis direction. As shown in FIG. 4 , the energy storage unit 210 includes a plurality of energy storage elements 211, cables 212 and detection wires 212a, a bus bar frame 213, a plurality of bus bars 214, an exterior body 218 including a first lower exterior body 215, a second lower exterior body 216, and an upper exterior body 217, and an exhaust path forming portion 219. The energy storage unit 210 may also include restraining members (end plates, side plates, etc.) that restrain the plurality of energy storage elements 211.

[0038] [1.2.1 Description of Energy Storage Element 211] The energy storage element 211 is a secondary battery (single cell) that can charge and discharge electricity, and more specifically, is a non-aqueous electrolyte secondary battery such as a lithium-ion secondary battery. The energy storage element 211 is a non-aqueous electrolyte energy storage element that generates flammable gas. In other words, if an abnormality such as an internal short circuit occurs in the energy storage element 211 due to some cause such as application of external stress to the energy storage element 211 or the intrusion of foreign matter into the energy storage element 211, the energy storage element 211 may experience thermal runaway. If the energy storage element 211 experiences thermal runaway, the energy storage element 211 generates high-temperature gas. If the energy storage element 211 is a non-aqueous electrolyte energy storage element, the gas (vent gas) discharged from the energy storage element 211 contains flammable gas. Air (oxygen) is present inside the housing 100, and if combustion occurs due to thermal runaway of the storage element 211, the storage element 211 and components of the storage device 200 may burn, and smoke may also be generated.

[0039] The energy storage element 211 has a flat rectangular parallelepiped shape (rectangular). A plurality of energy storage elements 211 are arranged side by side in the Y-axis direction. A heat-insulating, flat, rectangular spacer 211d is arranged adjacent to the energy storage element 211 in the Y-axis direction. The shape, arrangement position, arrangement direction, number, etc. of the energy storage element 211 are not particularly limited. The energy storage element 211 may be a secondary battery other than a non-aqueous electrolyte secondary battery, or may be a non-aqueous electrolyte capacitor. The energy storage element 211 may be a primary battery. The energy storage element 211 may be a battery using a solid electrolyte. The energy storage element 211 may be a pouch-type energy storage element. The arrangement position, shape, number, etc. of the spacer 211d are also not particularly limited.

[0040] The energy storage element 211 includes a container 211a and a pair of terminals 211b (positive and negative electrodes). The container 211a contains an electrode assembly, a pair of current collectors (positive and negative electrodes), an electrolyte (non-aqueous electrolyte), and other components, but these components are not shown in the figure. There are no particular restrictions on the type of electrolyte, and various types can be selected as long as they do not impair the performance of the energy storage element 211. Gaskets and other components are disposed between the container 211a and the terminals 211b and current collectors to improve insulation and airtightness, but these components are also not shown in the figure.

[0041] The container 211a is a rectangular parallelepiped (square) container, and has a configuration in which a lid closes an opening of the container body in the positive direction of the Z axis. A gas exhaust valve 211c is disposed between a pair of terminals 211b on the lid of the container 211a. When pressure inside the container 211a increases, the gas exhaust valve 211c is exhausted from the container 211a to release the pressure. In this embodiment, the multiple energy storage elements 211 are arranged with their respective gas exhaust valves 211c facing the same direction (the positive direction of the Z axis). The material of the container 211a is not particularly limited, but is preferably a weldable metal such as stainless steel, aluminum, aluminum alloy, iron, or plated steel sheet.

[0042] The terminals 211b are electrode terminals (positive and negative terminals) electrically connected to the positive and negative plates of the electrode body via current collectors, and are formed of a metal (conductive) member such as aluminum, an aluminum alloy, copper, a copper alloy, etc. The terminals 211b of the power storage elements 211 located at both ends in the Y-axis direction among the multiple power storage elements 211 are connected to the cable 212, thereby enabling the power storage device 200 to charge with electricity from the outside and discharge electricity to the outside.

[0043] The electrode body is a 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 current collector foil made of a metal such as aluminum or an aluminum alloy, on which a positive electrode active material layer is formed. The negative electrode plate is a current collector foil made of a metal such as copper or a copper alloy, on which a negative electrode active material layer is formed. As the active materials 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 is capable of absorbing and releasing charge transport ions.

[0044] The current collectors are conductive members (positive and negative current collectors) electrically connected to the terminal 211b and the electrode body. The positive current collector is made of aluminum or an aluminum alloy, similar to the current collector foil of the positive electrode plate, and the negative current collector is made of copper or a copper alloy, similar to the current collector foil of the negative electrode plate.

[0045] [1.2.2 Description of Cable 212, Bus Bar Frame 213, Bus Bar 214, etc.] The cable 212 is an electric wire through which a current flows for charging and discharging the energy storage device 200 (energy storage elements 211). The detection wire 212a is an electric wire for detecting the state of the energy storage elements 211, such as for measuring the voltage or temperature of the energy storage elements 211, or for balancing the voltage between the energy storage elements 211.

[0046] The bus bar frame 213 is a flat, rectangular member that can electrically insulate the bus bar 214 from other members and can regulate the position of the bus bar 214. The bus bar frame 213 is made of an insulating material 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), polyethersulfone (PES), polyamide (PA), ABS resin, or a composite material thereof, ceramic, or metal with an insulating coating.

[0047] The bus bar frame 213 is disposed above the plurality of energy storage elements 211 and is positioned relative to the plurality of energy storage elements 211. The plurality of bus bars 214 are disposed and positioned on the bus bar frame 213. The bus bar frame 213 is provided with an exhaust path forming portion arrangement portion 213a in which the exhaust path forming portion 219 is disposed. The exhaust path forming portion arrangement portion 213a is a recess that is disposed in the center of the bus bar frame 213 in the X axis direction and extends in the Y axis direction.

[0048] Each bus bar 214 is a rectangular plate-like member that electrically connects the terminals 211b of the multiple energy storage elements 211 to each other. The bus bars 214 are formed of a metal such as aluminum, an aluminum alloy, copper, a copper alloy, or nickel. In the present embodiment, the bus bars 214 connect the multiple energy storage elements 211 in series, but the manner in which the energy storage elements 211 are connected is not particularly limited. The multiple bus bars 214 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 an exhaust path forming portion 219 is arranged between these two bus bar groups.

[0049] [1.2.3 Description of Exterior Body 218] The exterior body 218 is a member (case) that is long in the Y-axis direction and is disposed outside the multiple energy storage elements 211 and that constitutes a housing (outer shell of the energy storage unit 210) that covers the multiple energy storage elements 211. The exterior body 218 houses the multiple energy storage elements 211, fixes the multiple energy storage elements 211 in predetermined positions, and protects them from impacts and the like. The exterior body 218 includes a first lower exterior body 215, a second lower exterior body 216, and an upper exterior body 217.

[0050] The first lower exterior body 215 is a box-shaped (flat, approximately rectangular parallelepiped) tray that is long in the Y-axis direction and shallow in depth, and is arranged in the negative Z-axis direction of the multiple energy storage elements 211, and supports the multiple energy storage elements 211. The first lower exterior body 215 is placed on the second lower exterior body 216. The first lower exterior body 215 can be formed from any insulating material that can be used for the bus bar frame 213 described above, such as PC, PP, or PE. The first lower exterior body 215 may have a box-like shape that accommodates all of the multiple energy storage elements 211.

[0051] Fixing portion 216a located at the end of second lower exterior body 216 in the negative Y-axis direction and fixing portion 217b located at the end of upper exterior body 217 in the negative Y-axis direction are fixed together with screws, etc. Fixing portion 216b located at the end of second lower exterior body 216 in the positive Y-axis direction and fixing portion 217c located at the end of upper exterior body 217 in the positive Y-axis direction are fixed together with screws, etc.

[0052] In this way, the second lower exterior body 216 and the upper exterior body 217 are connected to each other by screws or the like while sandwiching the first lower exterior body 215, the bus bar frame 213, etc. from above and below, thereby protecting (reinforcing) the first lower exterior body 215, the bus bar frame 213, etc. The second lower exterior body 216 and the upper exterior body 217 are formed from metal members or the like such as stainless steel, aluminum, aluminum alloy, iron, plated steel plate, etc. The second lower exterior body 216 supports the first lower exterior body 215 from below (the negative Z-axis direction). The upper exterior body 217 presses and supports the bus bar frame 213 and the exhaust path forming portion 219 from above. A rectangular opening 217a, through which the exhaust path forming portion 219 passes, is formed in the center of the Y-axis positive end of the upper exterior body 217 in the X-axis direction.

[0053] [1.2.4 Description of Exhaust Path Forming Part 219] The exhaust path forming part 219 is a member that forms an exhaust path for gas exhausted from (the gas exhaust valves 211c of) the energy storage elements 211. The exhaust path forming part 219 is arranged above the energy storage elements 211 (above the gas exhaust valves 211c) and facing the energy storage elements 211 (the gas exhaust valves 211c). The exhaust path forming part 219 is a long rectangular tubular member that extends in the Y-axis direction, with an open face facing the positive Y-axis direction and a closed face facing the negative Y-axis direction. As a result, the exhaust path forming part 219 forms a flow path 219a through which gas exhausted from the gas exhaust valves 211c flows in the positive Y-axis direction. In this embodiment, the exhaust path forming part 219 is arranged above the bus bar frame 213 and in the exhaust path forming part arrangement part 213a of the bus bar frame 213. The exhaust path forming portion 219 is a member separate from the exterior body 218 , and is disposed to protrude from an opening 217 a at the end of the exterior body 218 in the positive direction of the Y axis, and is connected to the flow path forming member 300 .

[0054] Because the exhaust path forming portion 219 passes through the gas discharged from the gas exhaust valve 211c, it is preferably formed from a non-flammable material with high heat resistance and heat dissipation properties. The exhaust path forming portion 219 is preferably formed from a material that does not melt (or deform) at the temperature of high-temperature gas. The exhaust path forming portion 219 is preferably formed from a non-flammable material with higher heat resistance and heat dissipation properties than the bus bar frame 213 and the first lower exterior body 215. The exhaust path forming portion 219 is formed from a metal member such as stainless steel, aluminum, aluminum alloy, iron, or plated steel plate. The bottom wall portion of the exhaust path forming portion 219 may be formed from a highly heat-resistant resin member, and the other portions may be formed from metal members. When the exhaust path forming portion 219 and the bus bar frame 213 or the exterior body 218 (upper exterior body 217) are integrally molded from a single member, all of them must be molded from a material with high heat resistance, etc. In this embodiment, only the exhaust path forming portion 219, which is separate from the bus bar frame 213 and the outer casing 218 (upper outer casing 217), needs to be formed from a material with high heat resistance, etc., so the amount of material with high heat resistance, etc. used can be reduced.

[0055] The exhaust path forming portion 219 is pressed downward by the upper exterior body 217. More specifically, the second lower exterior body 216 and the upper exterior body 217 are connected by screwing or the like while sandwiching the exhaust path forming portion 219, the energy storage elements 211, etc. from above and below, thereby pressing the exhaust path forming portion 219 downward. This pressing force presses the exhaust path forming portion 219 toward the plurality of energy storage elements 211 (their gas exhaust valves 211c). This allows gas from the energy storage elements 211 to be introduced into the exhaust path forming portion 219. This pressing force can also suppress misalignment of the plurality of energy storage elements 211 in the vertical direction.

[0056] 5, the exhaust path forming portion 219 is formed with an inlet 219b for gas exhausted from the gas exhaust valve 211c of the energy storage element 211. The exhaust path forming portion 219 is provided with a protruding portion 219c that protrudes from the inlet 219b, and a cylindrical portion 219d is disposed around the protruding portion 219c. The protruding portion 219c is a convex portion that protrudes in the negative Z-axis direction from the periphery of the inlet 219b so as to surround the periphery of the inlet 219b. The cylindrical portion 219d is a cylindrical member made of rubber or the like that continuously surrounds and seals the periphery (entire periphery) of the protruding portion 219c to suppress gas leakage when the gas exhaust valve 211c is open.

[0057] [1.3 Description of Flow Channel Forming Member 300] Next, the configuration of the flow channel forming member 300 will be described in detail. The flow channel forming member 300 is a member that forms a flow channel that discharges gas discharged from the power storage device 200 to the outside of the housing 100. As shown in FIGS. 1 and 2 , the flow channel forming member 300 is connected to the power storage device 200 and discharges gas discharged from the power storage device 200 to the outside of the housing 100. Specifically, as shown in FIGS. 3 and 4 , the flow channel forming member 300 is connected to an exhaust path forming portion 219 of the power storage device 200 and discharges gas discharged from the power storage elements 211 to the outside of the housing 100. In other words, the flow channel forming member 300 discharges gas that has been discharged from the power storage elements 211 and passed through the exhaust path forming portion 219 to the outside of the housing 100.

[0058] The flow path forming member 300 is a long, rectangular cylindrical (tubular) member (piping) that extends in the Y-axis direction and is open on both sides in the Y-axis direction. The flow path forming member 300 is disposed in the positive Y-axis direction of the exhaust path forming portion 219, and the end of the flow path forming member 300 in the negative Y-axis direction is connected (joined) to the end of the exhaust path forming portion 219 in the positive Y-axis direction. The flow path forming member 300 and the exhaust path forming portion 219 may be connected (joined) by any method, such as welding, bolting, crimping, or fitting. As a result, the flow path forming member 300 forms a flow path 300a (see FIG. 4 ) through which gas discharged from the gas exhaust valve 211c and passing through the exhaust path forming portion 219 flows in the positive Y-axis direction. The flow path 300a of the flow path forming member 300 is linearly connected to the flow path 219a of the exhaust path forming portion 219. It is preferable that the flow path forming member 300 has the same size and shape as the exhaust path forming portion 219 when viewed from the Y-axis direction, but it may have any size and shape as long as it can be connected to the exhaust path forming portion 219 (the flow path 300a can be connected to the flow path 219a).

[0059] Like the exhaust path forming portion 219, the flow path forming member 300 is preferably formed of a non-flammable material with high heat resistance and heat dissipation properties because the gas discharged from the gas exhaust valve 211c passes through it. The flow path forming member 300 is preferably formed of a material that does not melt (or deform) at the temperature of high-temperature gas. The flow path forming member 300 can be formed of any metal material that can be used for the exhaust path forming portion 219. In this embodiment, the flow path forming member 300 is a separate member from the exhaust path forming portion 219, but the flow path forming member 300 and the exhaust path forming portion 219 may also be formed integrally.

[0060] 2 , an exhaust port 141 is formed in the rear wall 140 of the housing 100, and the flow path forming member 300 penetrates the exhaust port 141 and protrudes from the rear wall 140 in the positive direction of the Y axis. As a result, gas that has passed through the flow path forming member 300 is discharged to the outside of the housing 100 from the end (exhaust port 141) of the flow path forming member 300 in the positive direction of the Y axis. The gap between the exhaust port 141 and the flow path forming member 300 is sealed, thereby maintaining the dustproof and waterproof properties of the housing 100 described above. The flow path forming member 300 does not need to protrude from the rear wall 140 in the positive direction of the Y axis as long as it can discharge the gas to the outside of the housing 100.

[0061] [1.4 Description of Fire Extinguisher 400] Next, the configuration of the fire extinguisher 400 will be described in detail. The fire extinguisher 400 is disposed outside the flow path forming member 300 within the housing 100 and within the same space as the space in which the power storage device 200 is housed. The outside of the flow path forming member 300 means outside the flow path 300a of the flow path forming member 300 (a position different from the flow path 300a). In other words, the fire extinguisher 400 is disposed in a space different from the flow path 300a of the flow path forming member 300 or in a space not connected to the flow path 300a. The same space as the space in which the power storage device 200 is housed is a space connected to the space in which the power storage device 200 is housed (a space through which gas can pass). The fire extinguisher 400 is disposed within the same space as the space in which the power storage device 200 is housed so that the fire extinguisher 400 will reach the power storage device 200 if it spreads. The fire extinguishing agent 400 is placed at a position where it can be diffused within the same space as the space in which the power storage device 200 is housed.

[0062] As described above, an opening (not shown) is formed in the second shelf 180, allowing gas to pass through the opening. Therefore, the space in which the power storage device 200 is housed within the housing 100 is connected, and this space is referred to as space S (see FIGS. 1 and 2 ). Inside the housing 100, air is present around the power storage device 200 and other components. In other words, space S contains an amount (concentration) of oxygen that can cause combustion. Space S is a space outside the flow path forming member 300 within the housing 100, and is a space in which the power storage device 200 is housed. Space S is a space that is not connected to the flow path 300a of the flow path forming member 300. The fire extinguishing agent 400 is disposed in the same space as space S (a connected space, a space through which gas can pass).

[0063] Specifically, the extinguishing agent 400 is disposed adjacent to the power storage device 200 or the flow path forming member 300. In this embodiment, the extinguishing agent 400 is disposed adjacent to the flow path forming member 300. "Disposed adjacent to the flow path forming member 300" refers to a state in which the extinguishing agent 400 is disposed relatively close to the flow path forming member 300, and includes a case in which the extinguishing agent 400 is disposed in contact with the flow path forming member 300, and a case in which the extinguishing agent 400 is disposed close to but not in contact with the flow path forming member 300. In other words, the extinguishing agent 400 is disposed around the flow path forming member 300. In this embodiment, the extinguishing agent 400 is attached to the flow path forming member 300 in a state in contact with the flow path forming member 300. Specifically, as shown in FIGS. 1 to 3 , the extinguishing agent 400 is disposed in the positive direction of the Z axis of the flow path forming member 300 in a state in contact with the surface of the flow path forming member 300 in the positive direction of the Z axis, and is fixed to the flow path forming member 300. The fire extinguishing agent 400 may be arranged with a gap between it and the flow path forming member 300 (close to but not in contact with).

[0064] The extinguishing agent 400 extends in the Y-axis direction, along the extension direction of the flow path forming member 300 (Y-axis direction). In this embodiment, the extinguishing agent 400 has a rectangular parallelepiped shape that is long in the Y-axis direction. The extinguishing agent 400 is disposed within the range of the flow path forming member 300 when viewed from the Z-axis direction. In other words, the extinguishing agent 400 is disposed so as not to protrude from the flow path forming member 300 in the X-axis direction and the Y-axis direction. The shape, size, and arrangement position of the extinguishing agent 400 are not particularly limited. The extinguishing agent 400 may be cylindrical, for example, and may surround the outer periphery of the flow path forming member 300.

[0065] The fire extinguishant 400 is a thermally reactive fire extinguishant (thermally reactive fire extinguishant). When the gas discharged from the gas discharge valve 211c of the energy storage element 211 passes through the flow path forming member 300, the fire extinguishant 400 reacts with the heat of the gas and diffuses into the space S within the housing 100. In other words, the fire extinguishant 400 diffuses into the space S within the housing 100 by being heated to a predetermined temperature or higher. The fire extinguishant 400 may be wrapped in a bag-shaped tube or film made of a resin or the like that melts with the heat of the gas. The bag-shaped tube or film may melt and break due to the heat of the gas, thereby diffusing the fire extinguishant 400 into the space S. In this way, arranging the fire extinguishant 400 in the same space as the space S also includes arranging a member containing the fire extinguishant 400 in the same space as the space S.

[0066] Any known material can be used as the fire extinguisher 400. Potassium-based fire extinguishers, such as Yamato Protec's K / SMOKE PANEL or TOPPAN's FSfilm (registered trademark), or fire extinguishing gases wrapped in tubes, such as Nichibo's Fire Race (registered trademark), can be used as the fire extinguisher 400. Examples of "fire extinguishing gases and other fire extinguishing agents" include FK-5-1-12 (a fluoroketone-based fire extinguisher), Yamato Protec's K / SMOKE GAS, nitrogen-based fire extinguishers, carbon dioxide-based fire extinguishers, and ABC powder fire extinguishers. K-SMOKE is a registered trademark of Yamato Protec. A coolant can also be used as the fire extinguisher 400. Any known coolant can be used as the fire extinguisher 400.

[0067] [2 Description of Effects] As described above, the power storage board 10 according to the embodiment of the present invention includes a flow path forming member 300 that forms a flow path 300a that discharges gas discharged from the power storage device 200 to the outside of the housing 100. The power storage board 10 includes a fire extinguishing agent 400 that is disposed within the housing 100, outside the flow path forming member 300, and within the same space as the space S in which the power storage device 200 is housed. This allows the gas to be discharged to the outside of the housing 100 by the flow path forming member 300 when gas is discharged from the power storage device 200, for example, during thermal runaway of the power storage elements 211. This makes it possible to prevent the power storage device 200 within the housing 100 from being thermally affected by the gas. By disposing the fire extinguishing agent 400 within the same space as the space S in which the power storage device 200 is housed within the housing 100, it is possible to prevent the power storage device 200 from being thermally affected. That is, gas (flammable gas) that may ignite components of the energy storage device 200 (e.g., easily ignitable resin components such as the bus bar frame 213 and the first lower exterior body 215) can be discharged to the outside of the housing 100. Furthermore, the fire extinguishing agent 400 can be dispersed into the space S in the housing 100 in which the energy storage device 200 is housed, filling the space S with the fire extinguishing agent 400. This prevents the components of the energy storage device 200 from igniting, even in the event of thermal runaway of the energy storage element 211, and suppresses thermal chain reaction to other energy storage elements 211, improving safety. In this way, the energy storage board 10 can suppress thermal effects on the energy storage device 200 disposed within the housing 100.

[0068] By arranging the fire extinguishing agent 400 adjacent to the flow path forming member 300, the fire extinguishing agent 400 reacts with the heat of the gas passing through the flow path forming member 300, causing the fire extinguishing agent 400 to diffuse within the housing 100, and filling the inside of the housing 100 (within the space S) with the fire extinguishing agent 400.

[0069] Since the extinguishing agent 400 is arranged in a space S that is not connected to the flow path 300a within the flow path forming member 300, the gas passing through the flow path forming member 300 can be discharged outside the housing 100 while preventing the extinguishing agent 400 from being discharged outside the housing 100.

[0070] The above effect can be applied to all storage devices 200, flow path forming members 300 and fire extinguishing agents 400 provided in the storage panel 10, to each storage device 200 and the flow path forming members 300 and fire extinguishing agents 400 corresponding to each storage device 200.

[0071] [3 Description of Modifications] While the storage panel 10 according to the embodiment of the present invention has been described above, the present invention is not limited to this embodiment. The embodiment disclosed herein is an example in all respects, and the scope of the present invention includes all modifications within the meaning and scope of the claims.

[0072] (Modification 1) In the above embodiment, the fire extinguishing agent 400 is arranged adjacent to the flow path forming member 300, but this is not limited to this. Fig. 6 is a cross-sectional view showing the internal configuration of the housing 100 of the power storage board 11 according to Modification 1 of the present embodiment. Fig. 6 is a view corresponding to Fig. 2.

[0073] As shown in FIG. 6 , the power storage board 11 in this modification includes a fire extinguishing agent 401 instead of the fire extinguishing agent 400 included in the power storage board 10 in the above embodiment. The fire extinguishing agent 401 is disposed adjacent to the power storage device 200. That is, the fire extinguishing agent 401 is disposed in contact with the power storage device 200, or is disposed in proximity to but not in contact with the power storage device 200, thereby being disposed in a position relatively close to the power storage device 200. The fire extinguishing agent 401 is disposed around the power storage device 200. In this modification, the fire extinguishing agent 401 is attached to the power storage device 200 in a state of contact with the power storage device 200. Specifically, the fire extinguishing agent 401 is disposed in the positive direction of the Z axis of the power storage device 200 in a state of contact with a surface of the power storage device 200 in the positive direction of the Z axis, and is fixed to the power storage device 200. The fire extinguishing agent 401 may be arranged with a gap between it and the power storage device 200 (close to but not in contact with the power storage device 200).

[0074] The fire extinguishing agent 401 extends in the Y-axis direction along the longitudinal direction (Y-axis direction) of the power storage device 200. In this modification, the fire extinguishing agent 401 has a rectangular parallelepiped shape that is long in the Y-axis direction. The fire extinguishing agent 401 is arranged within the range of the power storage device 200 when viewed from the Z-axis direction. In other words, the fire extinguishing agent 401 is arranged so as not to protrude from the power storage device 200 in the X-axis direction and the Y-axis direction. The shape, size, arrangement position, etc. of the fire extinguishing agent 401 are not particularly limited. The fire extinguishing agent 401 may be arranged on a surface of the power storage device 200 in the X-axis direction or the Y-axis direction, etc.

[0075] The fire extinguishing agent 401 is disposed outside the flow path forming member 300 within the housing 100, and in the same space as the space S in which the power storage device 200 is housed. The fire extinguishing agent 401 may be the same as the fire extinguishing agent 400 in the above embodiment. When gas is discharged from the gas discharge valve 211c of the power storage element 211, the fire extinguishing agent 401 reacts with heat from the power storage device 200 and diffuses into the space S within the housing 100. The other configurations of this modified example are the same as those of the above embodiment, and therefore will not be described again.

[0076] This modification also achieves the same effects as the above embodiment. In particular, in this modification, by arranging fire extinguishing agent 401 adjacent to power storage device 200, fire extinguishing agent 401 reacts with the heat of power storage device 200, causing fire extinguishing agent 401 to diffuse within housing 100, and thereby filling housing 100 (space S) with fire extinguishing agent 401.

[0077] (Modification 2) In the above embodiment, the fire extinguishing agent 400 is arranged for each power storage device 200 (each flow path forming member 300), but this is not limited to this. Fig. 7 is a cross-sectional view showing the internal configuration of the housing 100 of the power storage board 12 according to Modification 2 of the present embodiment. Fig. 7 is a view corresponding to Fig. 2.

[0078] As shown in FIG. 7 , the power storage board 12 of this modification includes a flow path forming member 310 and a fire extinguishing agent 402 instead of the multiple flow path forming members 300 and the fire extinguishing agent 400 included in the power storage board 10 of the above embodiment. The flow path forming member 310 includes a flow path forming member connected to the multiple power storage devices 200 and a flow path forming member that aggregates the flow path forming members, and discharges gas discharged from the power storage devices 200 to the outside of the housing 100. In this modification, as shown in FIG. 7 , if the multiple power storage devices 200 arranged in the Z-axis direction are referred to as power storage devices 201 to 206, flow path forming members 311 to 316 are connected to the power storage devices 201 to 206, respectively. A flow path forming member 317 is connected to the flow path forming members 311 to 316. The flow path forming member 310 is a cylindrical (tubular) member (pipe). The material etc. of the flow path forming member 310 is the same as the material etc. of the flow path forming member 300 in the above embodiment. Similarly, for the multiple power storage devices 200 arranged in the X-axis direction, a flow path forming member is connected, and a flow path forming member 317 is connected to the flow path forming member.

[0079] The flow path forming member 317 extends in the Y-axis direction and penetrates the exhaust port 141 in the rear wall 140 of the housing 100, protruding from the rear wall 140 in the positive direction of the Y-axis. As a result, gas that has passed through the flow path forming member 310 is discharged to the outside of the housing 100 from the end (exhaust port 141) of the flow path forming member 317 in the positive direction of the Y-axis. The gap between the exhaust port 141 and the flow path forming member 317 is sealed, thereby maintaining the dustproof and waterproof properties of the housing 100 described above. The flow path forming member 317 does not need to protrude from the rear wall 140 in the positive direction of the Y-axis as long as it can discharge the gas to the outside of the housing 100. In this modification, the flow path forming member 317 (exhaust port 141) is disposed at the end of the rear wall 140 in the positive direction of the Z-axis, but may also be disposed in the center or the end of the rear wall 140 in the negative direction of the Z-axis.

[0080] Hereinafter, the power storage device 201 will also be referred to as the first power storage device 201, and the flow path forming member 311 will also be referred to as the first flow path forming member 311. The power storage device 202 will also be referred to as the second power storage device 202, and the flow path forming member 312 will also be referred to as the second flow path forming member 312. The flow path forming member 317 will also be referred to as the third flow path forming member 317. The flow path forming member 310 includes a first flow path forming member 311 connected to the first power storage device 201 as the power storage device 200, and a second flow path forming member 312 connected to the second power storage device 202 as the power storage device 200. The flow path forming member 310 further includes a third flow path forming member 317 connected to the first flow path forming member 311 and the second flow path forming member 312.

[0081] In this configuration, the extinguishing agent 402 is disposed adjacent to the third flow path forming member 317. That is, the extinguishing agent 402 is disposed in contact with the third flow path forming member 317, or is disposed in close proximity to but not in contact with the third flow path forming member 317, thereby being disposed relatively close to the third flow path forming member 317. The extinguishing agent 402 is disposed around the third flow path forming member 317. In this modification, the extinguishing agent 402 is attached to the third flow path forming member 317 while being in contact with the third flow path forming member 317. Specifically, the extinguishing agent 402 is disposed in the positive direction of the Z axis of the third flow path forming member 317 while being in contact with the surface of the third flow path forming member 317 facing in the positive direction of the Z axis, and is fixed to the third flow path forming member 317. The extinguishing agent 402 may be disposed with a gap between it and the third flow path forming member 317 (close to but not in contact with the third flow path forming member 317). The shape, size, and location of the extinguishing agent 402 are not particularly limited. The fire extinguishing agent 402 may be in a cylindrical shape or the like that surrounds the outer periphery of the third flow path forming member 317 .

[0082] The extinguishing agent 402 is disposed outside the flow path forming member 310 within the housing 100 and in the same space as the space S in which the energy storage device 200 is housed. The same extinguishing agent as the extinguishing agent 400 in the above-described embodiment can be used as the extinguishing agent 402. When the gas discharged from the gas discharge valve 211c of the energy storage element 211 passes through the third flow path forming member 317, the extinguishing agent 402 reacts with the heat of the gas and diffuses into the space S within the housing 100. Each flow path forming member (e.g., flow path forming members 311 to 316), such as the first flow path forming member 311 and the second flow path forming member 312, may be provided with a check valve to prevent the gas discharged from the energy storage element 211 from flowing back through another flow path forming member. The other configuration of this modified example is the same as that of the above-described embodiment, and therefore a description thereof will be omitted.

[0083] This modification also achieves the same effects as the above-described embodiment. In particular, in this modification, the extinguishing agent 402 is disposed adjacent to the third flow path forming member 317, which is connected to the first flow path forming member 311 and the second flow path forming member 312. In this way, by disposing the extinguishing agent 402 at the third flow path forming member 317 where the first flow path forming member 311 and the second flow path forming member 312 join, the configuration can be simplified. By reducing the number of locations where the extinguishing agent 402 is disposed, space can be saved. Alternatively, the amount of extinguishing agent 402 used can be reduced. Regardless of whether gas is discharged from the first power storage device 201 or the second power storage device 202, the gas passes through the third flow path forming member 317. Therefore, by placing the fire extinguishing agent 402 on the third flow path forming member 317, even if gas is discharged from any of the storage devices 200, the heat of the gas will cause the fire extinguishing agent 402 to react and diffuse within the housing 100, thereby filling the inside of the housing 100 (within the space S) with the fire extinguishing agent 402.

[0084] In this modification, any of the power storage devices 200 among the power storage devices 201 to 206 may be referred to as a first power storage device and a second power storage device. Any of the flow path forming members among the flow path forming members 311 to 316 may be referred to as a first flow path forming member and a second flow path forming member. The flow path forming member 310 may include a plurality of third flow path forming members 317. In other words, the flow path forming members connected to all of the power storage devices 200 may not be collected into a single third flow path forming member 317, but may be divided and collected into a plurality of third flow path forming members 317 (a third flow path forming member 317 may be provided for every predetermined number of power storage devices 200).

[0085] (Variation 3) In the above-described variation 2, the third flow path forming member 317 extends in the Y-axis direction and discharges gas from the exhaust port 141 in the rear wall 140 of the housing 100, but this is not limited to this. Fig. 8 is a cross-sectional view showing the internal configuration of the housing 100 of the power storage board 13 according to variation 3 of the present embodiment. Fig. 8 is a view corresponding to Fig. 7 .

[0086] As shown in FIG. 8 , the power storage board 13 of this modification includes a flow path forming member 320 and a fire extinguishing agent 403 instead of the flow path forming member 310 and the fire extinguishing agent 402 included in the power storage board 12 of the second modification. The flow path forming member 320 includes flow path forming members 321-323, etc., connected to each of the plurality of power storage devices 200 (201-203, etc.), and a flow path forming member 324 connected to the flow path forming members 321-323, etc. As a result, the flow path forming member 320 discharges gas discharged from the power storage devices 200 to the outside of the housing 100. The flow path forming member 320 is a cylindrical (tubular) member (pipe). The material, etc., of the flow path forming member 320 is the same as the material, etc., of the flow path forming member 310 of the second modification. Similarly, a flow path forming member is connected to each of the plurality of power storage devices 200 arranged in the X-axis direction, and the flow path forming member 324 is connected to the flow path forming member.

[0087] The flow path forming member 324 extends in the Z-axis direction and penetrates the exhaust port 151 in the bottom wall 150 of the housing 100, protruding from the bottom wall 150 in the negative Z-axis direction. This allows gas that has passed through the flow path forming member 320 to be discharged to the outside of the housing 100 from the negative Z-axis end (exhaust port 151) of the flow path forming member 324. The gap between the exhaust port 151 and the flow path forming member 324 is sealed, thereby maintaining the dustproof and waterproof properties of the housing 100. The flow path forming member 324 does not need to protrude from the bottom wall 150 in the negative Z-axis direction as long as it can discharge the gas to the outside of the housing 100. In this modification, the flow path forming member 324 (exhaust port 151) is disposed at the positive Y-axis end of the bottom wall 150, but may also be disposed in the center of the bottom wall 150 in the Y-axis direction or at the negative Y-axis end.

[0088] Hereinafter, the power storage device 201 will also be referred to as the first power storage device 201, and the flow path forming member 321 will also be referred to as the first flow path forming member 321. The power storage device 202 will also be referred to as the second power storage device 202, and the flow path forming member 322 will also be referred to as the second flow path forming member 322. The flow path forming member 324 will also be referred to as the third flow path forming member 324. The flow path forming member 320 includes a first flow path forming member 321 connected to the first power storage device 201 as the power storage device 200, and a second flow path forming member 322 connected to the second power storage device 202 as the power storage device 200. The flow path forming member 320 further includes a third flow path forming member 324 connected to the first flow path forming member 321 and the second flow path forming member 322. As in the above-mentioned variant example 2, a check valve may be arranged in each flow path forming member (flow path forming members 321 to 323, etc.), such as the first flow path forming member 321 and the second flow path forming member 322, to prevent gas discharged from the storage element 211 from flowing back through other flow path forming members.

[0089] In this configuration, the extinguishing agent 403 is disposed adjacent to the third flow path forming member 324. That is, the extinguishing agent 403 is disposed in contact with the third flow path forming member 324, or in close proximity to but not in contact with the third flow path forming member 324, thereby being disposed relatively close to the third flow path forming member 324. The extinguishing agent 403 is disposed around the third flow path forming member 324. In this modification, the extinguishing agent 403 is attached to the third flow path forming member 324 while being in contact with the third flow path forming member 324. Specifically, the extinguishing agent 403 is disposed in the negative Y-axis direction of the third flow path forming member 324 while being in contact with the surface of the third flow path forming member 324 facing in the negative Y-axis direction, and is fixed to the third flow path forming member 324. The extinguishing agent 403 may be disposed with a gap between it and the third flow path forming member 324 (close to but not in contact with the third flow path forming member 324). The shape, size, and location of the extinguishing agent 403 are not particularly limited. The extinguishing agent 403 may be in a cylindrical shape or the like that surrounds the outer periphery of the third flow path forming member 324 .

[0090] The extinguishing agent 403 is disposed along the wall of the housing 100. That is, in this modification, the third flow path forming member 324 is disposed along the rear wall 140 of the housing 100. Therefore, the extinguishing agent 403 is disposed along the rear wall 140 of the housing 100. The extinguishing agent 403 is disposed outside the flow path forming member 320 within the housing 100 and in the same space as the space S in which the power storage device 200 is accommodated. The extinguishing agent 403 may be the same as the extinguishing agent 402 in the second modification. When the gas discharged from the gas discharge valve 211c of the power storage element 211 passes through the third flow path forming member 324, the extinguishing agent 403 reacts with the heat of the gas and diffuses into the space S within the housing 100. In this modification, an opening (not shown) is formed in the first shelf 170, and the extinguishing agent 403 can pass through the first shelf 170 through the opening. The other configurations of this modified example are the same as those of the above embodiment, and therefore description thereof will be omitted.

[0091] This modification also achieves the same effects as the above modification 2. In particular, in this modification, the extinguishing agent 403 is arranged along the wall of the housing 100, thereby saving space. The extinguishing agent 403 can be easily arranged even when the distance between the power storage device 200 and the wall of the housing 100 is short. By extending the third flow path forming member 324 along the wall (rear wall 140) of the housing 100 and discharging gas from the bottom wall 150 of the housing 100 (forming a gas exhaust port in the bottom wall 150), it is possible to prevent the gas exhaust port from being blocked by snow during snow accumulation.

[0092] In this modification, any of the power storage devices 200 among the power storage devices 201 to 203 may be referred to as a first power storage device and a second power storage device. Any of the flow path forming members among the flow path forming members 321 to 323 may be referred to as a first flow path forming member and a second flow path forming member. The flow path forming member 320 may include a plurality of third flow path forming members 324. In other words, the flow path forming members connected to all of the power storage devices 200 may not be collected into a single third flow path forming member 324, but may be divided and collected into a plurality of third flow path forming members 324 (a third flow path forming member 324 may be provided for every predetermined number of power storage devices 200).

[0093] (Modification 4) In the above embodiment, fire extinguishing agent 400 reacts with heat when heated and diffuses within housing 100, but this is not limited to this. Fig. 9 is a cross-sectional view showing the internal configuration of housing 100 of power storage board 14 according to modification 4 of the present embodiment. Fig. 9 is a view corresponding to Fig. 2.

[0094] 9, the power storage panel 14 of this modification includes a fire extinguishant cylinder 410 that stores fire extinguishant 404, instead of the fire extinguishant 400 included in the power storage panel 10 of the above embodiment, and a detection unit 500. The other configuration of this modification is the same as that of the above embodiment, and therefore description thereof will be omitted.

[0095] The detection unit 500 detects heat, gas, or smoke. When the detection unit 500 detects heat, gas, or smoke equal to or greater than a predetermined threshold, the detection unit 500 releases the fire extinguishing agent 404 into the housing 100. When the power storage element 211 experiences thermal runaway due to some abnormality and gas is discharged from the gas discharge valve 211c of the power storage element 211, the detection unit 500 detects the heat, gas, or smoke caused by the thermal runaway. The detection unit 500 detects heat, gas, or smoke inside and / or outside the housing 100. When the amount or temperature of the heat is equal to or greater than a predetermined threshold, when the amount or concentration of the gas is equal to or greater than a predetermined threshold, or when the amount or concentration of the smoke is equal to or greater than a predetermined threshold, the detection unit 500 releases the fire extinguishing agent 404 into the housing 100. The detection unit 500 opens a mechanical valve (not shown) of the fire extinguishing agent cylinder 410 to discharge the fire extinguishing agent 404 into the housing 100. The position where the detector 500 is disposed is not particularly limited, but the detector 500 is preferably disposed at the end of the housing 100 in the positive direction of the Z axis in order to detect heat, gas, or smoke.

[0096] The fire extinguishant 404 is arranged along the wall of the housing 100. That is, in this modified example, the fire extinguishant cylinder 410 is arranged along the front wall 130 of the housing 100. Therefore, the fire extinguishant 404 is arranged along the front wall 130 of the housing 100. The fire extinguishant 404 is arranged outside the flow path forming member 300 inside the housing 100, and in the same space as the space S in which the power storage device 200 is accommodated. The fire extinguishant 404 is arranged at a position where it can be diffused within the same space as the space S in which the power storage device 200 is accommodated. In this modified example, a member (fire extinguishant cylinder 410) that accommodates the fire extinguishant 404 is arranged outside the flow path forming member 300 inside the housing 100, and in the same space as the space S in which the power storage device 200 is accommodated.

[0097] The extinguishing agent 404 may be any suitable known material, such as FK-5-1-12 (a fluoroketone-based extinguishing agent), Yamato Protec's K / SMOKE GAS, a nitrogen-based extinguishing agent, a carbon dioxide-based extinguishing agent, or an extinguishing gas such as ABC powder extinguishing agent. Specifically, the extinguishing agent 404, such as a fire extinguishing gas, is compressed and contained in the extinguishing agent cylinder 410. K / SMOKE is a registered trademark of Yamato Protec. The extinguishing agent 404 is dispersed from the extinguishing agent cylinder 410 into the space S within the housing 100 by the detection unit 500. In this modification, an opening (not shown) is formed in the first shelf 170, allowing the extinguishing agent 404 to pass through the first shelf 170. The location of the extinguishing agent cylinder 410 (extinguishing agent 404) is not particularly limited.

[0098] This modification also achieves the same effects as the above-described embodiment. In particular, in this modification, when the detection unit 500 detects heat, gas, or smoke equal to or greater than a predetermined threshold, the detection unit 500 releases the fire extinguishant 404 into the housing 100, thereby dispersing the fire extinguishant 404 within the housing 100. In other words, when heat, gas, or smoke equal to or greater than a predetermined threshold is generated during thermal runaway of the energy storage element 211, the fire extinguishant 404 can be dispersed within the housing 100, filling the interior of the housing 100 (the space S) with the fire extinguishant 404. Even if the fire extinguishant 404 is not disposed adjacent to the energy storage device 200 or the flow path forming member 300 (even if the fire extinguishant 404 does not react with heat), the fire extinguishant 404 can be dispersed within the housing 100, allowing the fire extinguishant 404 to be disposed at a desired location.

[0099] (Other Modifications) In the above embodiment, the housing 100 of the power storage board 10 has a sealed structure, but it does not have to have a completely sealed structure.

[0100] In the above embodiment, exhaust port 141 is formed in rear wall 140 of housing 100, and flow path forming member 300 exhausts gas from exhaust port 141 in rear wall 140, but this is not limiting. Exhaust ports may be formed in a wall other than rear wall 140 of housing 100, and flow path forming member 300 may exhaust gas from the exhaust ports in the wall other than rear wall 140.

[0101] In the above embodiment, the exhaust path forming portion 219 is arranged on the bus bar frame 213, but it does not have to be arranged on the bus bar frame 213. The exhaust path forming portion 219 may be formed integrally (integrated) with the bus bar frame 213. The exhaust path forming portion 219 may be formed integrally (integrated) with the exterior body 218.

[0102] In the above embodiment, the exhaust path forming portion 219 is a long rectangular tubular member, but the shape of the exhaust path forming portion 219 is not particularly limited, and may be a cylindrical shape, an elongated cylindrical shape, an elliptical cylindrical shape, a polygonal cylindrical shape other than a rectangular shape, or the like, and does not have to be long. The same applies to the shape of the flow path forming member 300.

[0103] In the above embodiment, all of the power storage devices 200 included in the power storage panel 10 have the above configuration, but it is not necessary for any of the power storage devices 200 to have the above configuration. The same applies to the flow path forming member 300 and the fire extinguishing agent 400.

[0104] (Variation 5) In the above embodiment, the power storage device 200 may be replaced with a power storage board. In this case, the housing 100 may be a housing that houses the power storage board. The flow path forming member 300 may be a member that forms a flow path that discharges gas discharged from the power storage board to the outside of the housing 100. The fire extinguishing agent 400 may be disposed outside the flow path forming member 300 within the housing 100 and in the same space as the space that houses the power storage board. Specifically, this is as follows.

[0105] FIG. 10 is a schematic diagram showing the configuration of a power storage facility 1 according to a fifth modified example of the present embodiment. As shown in FIG. 10 , the power storage facility 1 according to this modified example includes a power storage board 10 including a power storage device 200, a housing 2 that houses the power storage board 10, a flow path forming member 3 that forms a flow path for discharging gas discharged from the power storage board 10 to the outside of the housing 2, and a fire extinguishing agent 4 that is disposed in the housing 2, outside the flow path forming member 3, and in the same space as the space in which the power storage board 10 is housed. The housing 100 that houses the power storage board 10 may be referred to as a first housing 100, and the housing 2 that houses the power storage facility 1 may be referred to as a second housing 2. The second housing 2 may be a container or a building. The second housing 2 is configured to be covered with a wall and has an airtight structure. The flow path forming member 300 that the power storage board 10 includes may be referred to as a power storage board flow path forming member 300, and the flow path forming member 3 that the power storage facility 1 includes may be referred to as a power storage facility flow path forming member 3. The fire extinguishing agent 400 provided in the power storage panel 10 may be referred to as the first fire extinguishing agent 400, and the fire extinguishing agent 4 provided in the power storage equipment 1 may be referred to as the second fire extinguishing agent 4. In this modification, the power storage panel 10 may not include the power storage panel flow path forming member 300, and may not include the first fire extinguishing agent 400. The power storage panel 10 may not include some or all of the walls (top wall, side wall, front wall, rear wall, bottom wall) as long as it has a frame that supports the power storage device 200. Any number of power storage panels 10 may be arranged in any arrangement within the second housing 2, and only one power storage panel 10 may be arranged. By rephrasing the power storage device 200 and the power storage panel 10 in the above embodiment and modification as the power storage panel 10 and the power storage equipment 1, various forms of power storage equipment 1 can be realized, and the same effects as those of the above embodiment and modification can be achieved.

[0106] Any combination of the above-described embodiments and modifications is also included within the scope of the present invention.

[0107] The present invention can be applied to a power storage board or the like equipped with a power storage device.

[0108] REFERENCE SIGNS LIST 1 Electricity storage equipment 2 Housing (second housing) 3 Flow path forming member (electricity storage equipment flow path forming member) 4 Fire extinguishing agent (second fire extinguishing agent) 10, 11, 12, 13, 14 Electricity storage board 100 Housing (first housing) 140 Rear wall 141, 151 Exhaust port 150 Bottom wall 200, 203, 204, 205, 206 Electricity storage device 201 Electricity storage device (first electricity storage device) 202 Electricity storage device (second electricity storage device) 211 Electricity storage element 211c Gas exhaust valve 213 Bus bar frame 214 Bus bar 215 First lower exterior body 216 Second lower exterior body 217 Upper exterior body 217a Opening 218 Exhaust body 219 Exhaust path forming portion 219a, 300a Flow path 219b Inlet 219c Protrusion 219d Cylindrical portion 300, 310, 313, 314, 315, 316, 320, 323 Flow path forming member (electrical storage board flow path forming member) 311, 321 Flow path forming member (first flow path forming member) 312, 322 Flow path forming member (second flow path forming member) 317, 324 Flow path forming member (third flow path forming member) 400, 401, 402, 403, 404 Fire extinguishing agent (first fire extinguishing agent) 410 Fire extinguishing agent cylinder 500 Detection unit

Claims

1. A storage board comprising: an electric storage device having an electric storage element; a housing that houses the electric storage device; a flow path forming member that forms a flow path for discharging gas discharged from the electric storage device to the outside of the housing; and a fire extinguishing agent that is placed inside the housing, outside the flow path forming member, and in the same space as the space in which the electric storage device is housed.

2. The storage panel according to claim 1, wherein the fire extinguishing agent is disposed adjacent to the storage device or the flow path forming member.

3. The storage board according to claim 1 or 2, wherein the flow path forming member comprises: a first flow path forming member connected to a first storage device as the storage device; a second flow path forming member connected to a second storage device as the storage device; and a third flow path forming member connected to the first flow path forming member and the second flow path forming member; and the fire extinguishing agent is arranged adjacent to the third flow path forming member.

4. A storage panel according to claim 1 or 2, wherein the fire extinguishing agent is disposed along the wall of the enclosure.

5. A storage board as described in claim 1 or 2, further comprising a detection unit that detects heat, gas, or smoke, and when the detection unit detects heat, gas, or smoke above a predetermined threshold, it releases the fire extinguishing agent into the housing.

6. An electricity storage facility comprising: a power storage board having a power storage device; a housing that houses the power storage board; a flow path forming member that forms a flow path for discharging gas discharged from the power storage board to the outside of the housing; and a fire extinguishing agent that is placed inside the housing, outside the flow path forming member, and in the same space as the space in which the power storage board is housed.

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