Power storage device

Abstract

To provide a power storage device capable of preventing gas leakage from assembly portions of a plurality of members.SOLUTION: A power storage device 1 comprises a plurality of power storage elements 11 each including a gas exhaust valve 111, and an exhaust part 50 being disposed on the plurality of power storage elements 11 and forming an exhaust path 59 for a gas exhausted from the gas exhaust valve 111. The exhaust part 50 includes a plurality of holes (a first hole 664 and a second hole 674) communicating to the gas exhaust valve 111 of each of the plurality of power storage elements 11. The exhaust path 59 is divided in an arrangement direction of the plurality of power storage elements 11 and includes a first split body 66 and a second split body 67 which is adjacent to the first split body 66, and at least one of the first split body 66 and the second split body 67 includes two or more holes in the plurality of holes. One end of the first split body 66 includes an overlap portion 681 protruding toward the second split body 67 and overlapping the other end of the second split body 67 in a planar view.SELECTED DRAWING: Figure 11

Description

[Technical field]

[0001] The present invention relates to an electricity storage device. [Background technology]

[0002] Conventionally, in an electricity storage device, an exhaust member (upper plate) is attached to a plurality of electricity storage elements (secondary batteries) arranged in a predetermined direction (see, for example, Patent Document 1). The exhaust member is a member that forms a flow path for gas released from the gas exhaust valve (vent) of each electricity storage element, and gas and electrolyte are exhausted from the tip of the exhaust member. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2011-108653 A Summary of the Invention [Problem to be solved by the invention]

[0004] In recent years, it has been considered to form exhaust members from multiple components. In this case, if there are gaps between the assembled parts of the multiple components, high-temperature gas may leak out from the gaps and adversely affect other components.

[0005] SUMMARY OF THE PRESENT DISCLOSURE ... An object of the present invention is to provide an electricity storage device capable of suppressing gas leakage from the assembly portions of multiple members. [Means for solving the problem]

[0006] In order to achieve the above-mentioned object, an energy storage device according to one embodiment of the present invention comprises a plurality of energy storage elements, each having a gas exhaust valve, arranged with the gas exhaust valves facing the same direction, and an exhaust section arranged on the plurality of energy storage elements and forming an exhaust path for gas discharged from the gas exhaust valve, the exhaust section having a plurality of holes communicating with the gas exhaust valves of each of the plurality of energy storage elements, the exhaust section being divided in the arrangement direction of the plurality of energy storage elements and comprising a first division body and a second division body adjacent to the first division body, at least one of the first division body and the second division body having two or more holes among the plurality of holes, and one end of the first division body having an overlap portion that protrudes toward the second division body and overlaps the other end of the second division body in a planar view.

[0007] According to this, in the adjacent portion of the first and second divisions that form the exhaust section, an overlap portion provided at one end of the first division overlaps with the other end of the second division in a plan view. This overlap portion can narrow the gap between the adjacent portions of the first and second divisions, thereby suppressing gas leakage from the adjacent portions.

[0008] In addition, the exhaust section forms an exhaust path together with the first and second dividers and is provided with a lid member covering the upper part of the exhaust path, the first divider has a first bottom having an overlapping portion and a pair of first divider wall portions standing up from both ends of the first bottom, the second divider has a second bottom adjacent to the first bottom and a second divider wall portion standing up from both ends of the second bottom, and the lid member may have a lid portion covering the first and second dividers and a pair of second wall portions standing up from both ends of the lid portion and overlapping the first divider wall portion and the second divider wall portion.

[0009] According to this, the gap between the adjacent portions of the first and second partition walls is covered by the second wall of the cover member. In this way, the overlap portion and the cover member can narrow the gap between the adjacent portions of the first and second partition walls, thereby further suppressing gas leakage from the adjacent portions.

[0010] In addition, a first flange portion protruding toward the energy storage element may be formed at one end of the first bottom portion, and a second flange portion protruding toward the energy storage element and facing the first flange portion may be formed at the other end of the second bottom portion.

[0011] With this, a first flange portion is formed at one end of the first bottom portion, and a second flange portion opposite the first flange portion is formed at the other end of the second bottom portion, so that the first flange portion and the second flange portion overlap each other, thereby narrowing the gap in the assembly portion.

[0012] Here, it is assumed that the first and second divisional bodies may be misaligned in the arrangement direction (vertical direction) of the energy storage element and the exhaust section due to their respective tolerances. In this embodiment, a first flange is formed at one end of the first bottom, and a second flange is formed at the other end of the second bottom, facing the first flange. Therefore, even if the first and second divisional bodies are misaligned in the vertical direction, the opposing relationship between the first and second flanges can be maintained, and the gap in the assembled portion can be narrowed. This makes it possible to suppress gas leakage even if the first and second divisional bodies are misaligned in the vertical direction.

[0013] Also, the tip end of the overlap portion may be disposed with a gap between it and the other end of the second division body.

[0014] Here, it is assumed that the first and second divided bodies may be misaligned in the protruding direction of the overlapping portion (longitudinal direction of the exhaust portion) due to their respective tolerances. In this embodiment, the tip of the overlapping portion is spaced apart from the other end of the second divided body, and this space can absorb misalignment caused by the tolerances. This allows the first and second divided bodies to be accurately positioned in the longitudinal direction.

[0015] The first division may be disposed closer to the exhaust port in the exhaust path than the second division, and the overlap portion may be disposed higher than the other end of the second division.

[0016] Here, when the high-temperature gas is discharged from the exhaust path, the gas may ignite when it comes into contact with a large amount of air (oxygen) at the exhaust port of the exhaust path. For example, when gas is discharged from an electric storage element close to the exhaust port, most of the gas heads toward the exhaust port. If the gas discharged from the exhaust port ignites, the fire may engulf the entire electric storage device and invade the electric storage element side through the exhaust path from the boundary between the first divided body and the second divided body. If the first divided body having an overlap portion is disposed on the exhaust port side as in this embodiment, and the overlap portion is disposed above the other end of the second divided body, the overlap portion can block the fire that invades the electric storage element side. In other words, even if the gas ignites, it is possible to suppress the fire from spreading to the normal electric storage element. Effect of the Invention

[0017] According to the electricity storage device of the present invention, it is possible to suppress gas leakage from the assembly portion of a plurality of members. [Brief description of the drawings]

[0018] [Figure 1A] 1 is a perspective view showing an external appearance of a power storage device according to a first embodiment. [Figure 1B] 1 is a side view showing the appearance of an electricity storage device according to a first embodiment. [Figure 1C] 1 is a front view showing the appearance of an electricity storage device according to a first embodiment. [Diagram 2] FIG. 2 is an exploded perspective view illustrating components of the electricity storage unit according to the first embodiment. [Diagram 3] 2 is an exploded perspective view showing a schematic configuration of an exhaust section and a bus bar frame according to the first embodiment. FIG. [Figure 4] 2 is an exploded perspective view showing a schematic configuration of an exhaust unit and an exterior body cover according to the first embodiment. FIG. [Diagram 5] 2 is a cross-sectional view showing a first split body that is a part of the exhaust unit according to the first embodiment, and its surrounding members. FIG. [Figure 6] 1 is a perspective view showing a schematic configuration of a first divided body and a second divided body according to the first embodiment. FIG. [Figure 7] 1 is a perspective view showing a schematic configuration of a first divided body and a second divided body according to the first embodiment. FIG. [Figure 8] 4 is a plan view showing a schematic positional relationship between a plurality of positioning protrusions and an energy storage element according to the first embodiment. FIG. [Figure 9] 4 is a cross-sectional view showing a schematic configuration of a positioning protrusion according to the embodiment. FIG. [Figure 10] 3 is a cross-sectional view showing each first interference portion and its surrounding members according to the first embodiment. FIG. [Figure 11] 5 is a cross-sectional view showing an engagement relationship between a first engagement portion and a second engagement portion according to the first embodiment. FIG. [Figure 12] FIG. 2 is a plan view showing a schematic diagram of a first division body and a second division body according to the embodiment; [Figure 13] 4 is a cross-sectional view showing a state in the middle of assembling the cover member and the exhaust member according to the first embodiment. FIG. [Figure 14] FIG. 2 is an explanatory diagram showing a sealing material according to the first embodiment. [Figure 15] FIG. 11 is an explanatory diagram showing a schematic configuration of a sealing material according to a second embodiment. [Figure 16] 11 is a bottom view showing a state in which the sealing material according to the second embodiment is assembled into a first division body and a second division body. FIG. [Figure 17] 11 is a cross-sectional view showing a sealing material according to embodiment 3 and its surrounding members. FIG. [Figure 18] 13 is a schematic diagram showing an example of the arrangement of a first interference portion according to embodiment 4. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] Hereinafter, a description will be given of an energy storage device according to an embodiment (including modified examples) of the present invention with reference to the drawings. Note that 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. Also, the dimensions and the like are not strictly illustrated in each drawing.

[0020] In the following description and drawings, the longitudinal direction of the energy storage device, the arrangement direction of a pair of electrode terminals (positive and negative) in one energy storage element, and the opposing direction of the short side surfaces of the container of the energy storage element are defined as the X-axis direction. The width direction of the energy storage device, the arrangement direction of the multiple energy storage elements, and the opposing direction of the long side surfaces of the container of the energy storage element are defined as the Y-axis direction. The height direction of the energy storage device, 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 element and the bus bar, the arrangement direction of the container body and the lid of the energy storage element, or the up-down direction are defined as the Z-axis direction. These X-axis direction, Y-axis direction, and Z-axis direction intersect with each other (orthogonal in this embodiment). Note that, although it is possible that the Z-axis direction is not the up-down direction depending on the mode of use, the following description will be given assuming that the Z-axis direction is the up-down direction for convenience of description.

[0021] In the following description, for example, the positive X-axis direction indicates the direction of the X-axis arrow, and the negative X-axis direction indicates the opposite direction to the positive X-axis direction. The same applies to the Y-axis and Z-axis directions. In this embodiment, the positive Y-axis direction is backward, and the negative Y-axis direction is forward. In addition, hereinafter, the Y-axis direction may be referred to as the first direction, and the X-axis direction may be referred to as the second direction. Furthermore, expressions indicating relative directions or attitudes, such as parallel and perpendicular, may also include cases where the directions or attitudes are not strictly the same. For example, 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, that is, include a difference of, for example, about several percent.

[0022] (Embodiment 1) [1 Energy storage device] The configuration of the energy storage device 1 in the present embodiment will be described. FIG. 1A is a perspective view showing the appearance of the energy storage device 1 according to embodiment 1. FIG. 1B is a side view showing the appearance of the energy storage device according to embodiment 1. (a) of FIG. 1B shows an overall side view of the energy storage device, and (b) of FIG. 1B is an enlarged side view of a portion surrounded by a dashed line in (a) of FIG. 1B. FIG. 1C is a front view showing the appearance of the energy storage device according to embodiment 1. FIG. 2 is an exploded perspective view showing each component when the energy storage unit 10 according to embodiment 1 is disassembled.

[0023] The power storage device 1 is a device that can be charged with electricity from the outside and can discharge electricity to the outside, and in this embodiment, has a substantially rectangular parallelepiped shape. For example, the power storage device 1 is used for power storage or power source. Specifically, the power storage device 1 is used as a stationary battery used in, for example, home or industrial power storage facilities. The power storage device 1 can also 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 railroad car for an electric railway. Examples of the above-mentioned automobile include an electric vehicle (EV), a hybrid electric vehicle (HEV), a plug-in hybrid electric vehicle (PHEV), and a gasoline-powered vehicle. Examples of the above-mentioned railroad car for an electric railway include a train, a monorail, and a linear motor car.

[0024] As shown in Figs. 1A, 1B, 1C and 2, 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, an exhaust section 50, a plurality of bus bars 13, and an exterior body 18 that includes an exterior body main body 14, an exterior body support body 15 and an exterior body cover body 17 that accommodate these. The energy storage unit 10 also includes a cable 30 that forms a part of the main circuit wiring and a detection line 13a. The energy storage unit 10 may include a restraining member (end plate, side plate, etc.) that restrains the plurality of energy storage elements 11.

[0025] 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 positive electrode of the energy storage element 11 contains a ternary positive electrode active material mainly composed of Li, Ni, Co, and Mn, and the negative electrode contains graphite as an active material. The positive electrode active material is LiMn 2 O 4 System, LiFePO 4 , LiCO 2 , LiNiO 2The negative electrode active material may be a carbon-based material (soft carbon, hard carbon, etc.), Si and its oxide (SiO, etc.), a tin alloy-based negative electrode, etc., and is not particularly limited. The energy density of the electric storage element 11 is 120 Wh / kg or more. The electric storage element 11 has a flat rectangular parallelepiped shape (square shape), and in this embodiment, 16 electric storage elements 11 are arranged in the Y-axis direction. The shape, arrangement position, number, etc. of the electric storage elements 11 are not particularly limited. The electric storage element 11 is not limited to a nonaqueous electrolyte secondary battery, and may be a secondary battery other than a nonaqueous electrolyte secondary battery, or may be a capacitor. The electric storage element 11 may be a primary battery that can use stored electricity without charging by the user, instead of a secondary battery. The electric storage element 11 may be a battery using a solid electrolyte. The electric storage element 11 may be a laminate type electric storage element.

[0026] Specifically, the energy storage element 11 includes a metallic container 11a, and an upper wall portion 11d of the container 11a is provided with a positive electrode terminal 11b and a negative electrode terminal 11c, which are metallic electrode terminals. That is, the positive electrode terminal 11b and the negative electrode terminal 11c are provided on the upper surface of the main body. A gas exhaust valve 111 (see FIG. 5, etc.) that exhausts gas and releases pressure when the pressure inside the container 11a rises is provided between the positive electrode terminal 11b and the negative electrode terminal 11c on the upper wall portion 11d of the container 11a. The energy storage element 11 has a flat rectangular parallelepiped shape whose thickness (dimension in the Y-axis direction) is smaller than its width (dimension in the X-axis direction), and the upper wall portion 11d has a rectangular shape when viewed from above (viewed in the Z-axis direction). The energy storage element 11 also has a long side surface parallel to the XZ plane and a short side surface parallel to the YZ plane, and the long sides of the multiple energy storage elements 11 are arranged so as to face each other. The multiple energy storage elements 11 are arranged with their gas exhaust valves 111 facing the same direction (positive direction of the Z axis). A heat insulating flat spacer 11e is arranged between adjacent energy storage elements 11. An injection part for injecting an electrolyte may be provided on the upper wall part 11d of the container 11a. An electrode body (also referred to as an electricity storage element or a power generating element), a current collector (a positive electrode current collector and a negative electrode current collector), and the like are arranged inside the container 11a, and an electrolyte (non-aqueous electrolyte) and the like are sealed therein, but a detailed description thereof will be omitted.

[0027] Here, the positive electrode terminal 11b and the negative electrode terminal 11c are disposed so as to protrude upward (in the positive direction of the Z axis) from the upper wall portion 11d of the container 11a. The outermost positive electrode terminals 11b and negative electrode terminals 11c of the multiple storage elements 11 are connected to the cable 30, so that the storage device 1 can be charged with electricity from the outside and can discharge electricity to the outside.

[0028] The cable 30 is an electric wire (also referred to as a power cable, electric power cable, power line, power line, or main circuit cable) through which a current (also referred to as a charge / discharge current or main current) for charging and discharging the energy storage device 1 (energy storage elements 11) flows, and has a positive power cable 31 on the positive side and a negative power cable 32 on the negative side. That is, the positive power cable 31 of the cable 30 is connected to the positive terminal 11b of the energy storage element 11 at the end in the positive direction of the Y axis among the multiple energy storage elements 11, and the negative power cable 32 of the cable 30 is connected to the negative terminal 11c of the energy storage element 11 at the end in the negative direction of the Y axis.

[0029] The busbar frame 12 is a flat rectangular member capable of electrically insulating the busbars 13 from other members and regulating the position of the busbars 13. The busbar frame 12 is formed of an insulating member such as polycarbonate (PC), polypropylene (PP), or polyethylene (PE). Specifically, the busbar frame 12 is placed above the multiple energy storage elements 11 and positioned relative to the multiple energy storage elements 11. In addition, the multiple 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 positive electrode terminals 11b and negative electrode terminals 11c of the multiple energy storage elements 11. The busbar frame 12 will be described in detail later.

[0030] Exhaust section 50 is disposed on bus bar frame 12, and constitutes an exhaust path 59 (see FIG. 5, etc.) for gas exhausted from gas exhaust valves 111 of each energy storage element 11. One end of exhaust section 50 in the positive Y-axis direction is exhaust port 51 through which gas is exhausted, and protrudes from one end of exterior body 18 in the positive Y-axis direction.

[0031] 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 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 positive electrode terminal 11b and the negative electrode terminal 11c of the adjacent energy storage elements 11 to connect the 16 energy storage elements 11 in series. The plurality of bus bars 13 are divided into a first bus bar group arranged along the Y axis direction on the positive side of the X axis (one side) and a second bus bar group arranged along the Y axis direction on the negative side of the X axis (the other side). Note that 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.

[0032] Further, a detection line 13a is connected to the bus bar 13 or the electrode terminal of the energy storage element 11. Note that the connection structure is not shown in the drawings. The detection line 13a is a cable for detecting the state of each 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. Note that a thermistor (not shown) for measuring the temperature of the energy storage element 11 is disposed on the bus bar 13 or the electrode terminal of the energy storage element 11, but the description thereof is omitted. Further, a connector 13b is connected to the end of the detection line 13a in the negative Y-axis direction. The connector 13b is a connector that is connected to a board of the board unit 20 described later. That is, 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. In addition, detection line 13a also has the function of discharging storage element 11 with a higher voltage by controlling the board, thereby balancing the voltages between storage elements 11.

[0033] 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. Here, 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.

[0034] The exterior body 14 is a bottomed rectangular box-shaped housing with an opening formed on the top surface. The exterior body 14 is made of an insulating material such as PC, PP, or PE. The exterior body 14 houses the multiple energy storage elements 11, the exhaust section 50, the bus bar frame 12, and the like.

[0035] Further, a plurality of partition wall portions 142 supporting the energy storage elements 11 are provided on the bottom wall inside the exterior body 14. The energy storage elements 11 are inserted and arranged between adjacent partition wall portions 142. This allows the energy storage elements 11 to be positioned at a predetermined interval. Note that other configurations may be used to support and position the energy storage elements 11 on the exterior body 14. The exterior body 14 also has a side opening 143 on the side. This side opening 143 allows the space between the adjacent energy storage elements 11 to communicate with the space outside the energy storage device 1, contributing to cooling the energy storage device 1 including the energy storage elements 11. A cutout portion 141 is formed at the end of the exterior body 14 on the positive Y-axis direction side, at the center of the upper portion thereof, through which the exhaust port 51 of the exhaust unit 50 penetrates. The cutout portion 141 is a rectangular cutout that is open at the top.

[0036] The exterior body support 15 and the exterior body lid 17 are exterior members that protect (reinforce) the exterior body main body 14. The exterior body support 15 and the exterior body lid 17 are formed of metal members such as stainless steel, aluminum, aluminum alloy, iron, plated steel plate, etc. Note that the exterior body support 15 and the exterior body lid 17 may be formed of members made of the same material or different materials.

[0037] 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 mounting portion 16, connection portions 15b and 15c, and a fixing portion 15d. The bottom portion 15a is a flat, rectangular portion 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.

[0038] The connection portion 15b is a flat, rectangular portion erected in the Z-axis positive direction from the end of the bottom portion 15a in the Y-axis negative direction toward the exterior body cover 17, and further has a fastening portion protruding in the Y-axis negative direction from the end of the bottom portion 15a in the Z-axis positive direction. The connection portion 15b is connected to the exterior body cover 17 at the fastening portion. The connection portion 15b forms a part of the front side surface of the energy storage unit 10. The board unit attachment portion 16 forms a part of the front side surface of the energy storage unit 10. The connection portion 15c is a flat, rectangular portion erected in the Z-axis positive direction from the end of the bottom portion 15a in the Y-axis positive direction toward the exterior body cover 17, and further has a fastening portion protruding in the Y-axis positive direction. The connection portion 15c is connected to the exterior body cover 17 at the fastening portion. The connection portion 15c forms a part of the rear side surface of the energy storage unit 10. The fixing portion 15d is a flat rectangular portion erected in the negative Z-axis direction from the end of the bottom portion 15a in the negative Y-axis direction, and is a fastening portion that is fixed to a structure such as a shelf (not shown). The fixing portion 15d is disposed in the center of the bottom portion 15a in the X-axis direction. In this embodiment, the fixing portion 15d is fixed to the shelf using screws, but any fixing method may be used as long as the fixing and release can be freely performed.

[0039] The exterior body cover 17 is a member that covers the upper side of the multiple energy storage elements 11. Specifically, the exterior body cover 17 is a member that is arranged to cover the opening of the exterior body main body 14, and has a top plate portion 17a and connection portions 17b and 17c. The top plate portion 17a is a flat, rectangular portion that is parallel to the XY plane and extends in the Y-axis direction, constituting the upper surface portion of the energy storage device 1, and is arranged above the exterior body main body 14. The connection portion 17b is arranged at the end of the top plate portion 17a in the negative Y-axis direction, is bent toward the exterior body support 15, and further includes a fastening portion that protrudes in the negative Y-axis direction, and is connected to the connection portion 15b of the exterior body support 15. The connection portion 17c has a flat, rectangular portion that stands in the negative Z-axis direction from the end of the top plate portion 17a in the positive Y-axis direction, and a fastening portion that further protrudes in the positive Y-axis direction. The connection portion 17c is connected to the connection portion 15c of the exterior body support 15 at the fastening portion. The connection portion 17c forms a part of the rear side surface of the energy storage unit 10. In this manner, the exterior body support 15 and the exterior body lid 17 are configured to be fixed by connecting the connection portions 15b and 15c to the connection portions 17b and 17c by screws or the like at each fastening portion while sandwiching the exterior body main body 14 from above and below. As a result, each member (the bus bar frame 12, the multiple energy storage elements 11, and the exhaust section 50) accommodated in the exterior body main body 14 is sandwiched in the above direction by the exterior body support 15 and the exterior body lid 17. Therefore, the exterior body lid 17 covers the upper side of the exhaust section 50.

[0040] Furthermore, an opening 171 (see FIG. 4) through which exhaust port 51 of exhaust unit 50 penetrates is formed in the center of the upper end (the end on the Z-axis positive direction side) of connection unit 17c of exterior body cover 17. Opening 171 has a shape in a plan view that corresponds to the outer shape of exhaust unit 50. In this embodiment, opening 171 has a rectangular shape in a plan view. Exhaust port 51 of exhaust unit 50 protrudes from exterior body 18 by penetrating opening 171 and cutout portion 141 of exterior body main body 14.

[0041] Bus bar frame 12 is provided with current-carrying components such as electrode terminals (positive terminal 11b and negative terminal 11c) of energy storage element 11, bus bars 13, and detection wires 13a. For this reason, to ensure electrical insulation with exterior body cover 17, which is a metal component, an insulating plate may be provided on the back surface (lower surface) of top plate portion 17a of exterior body cover 17. The insulating plate may be screwed to top plate portion 17a or attached thereto.

[0042] The board unit 20 shown in FIG. 1A 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. In the present embodiment, the board unit 20 is a flat rectangular member attached to an end of the energy storage unit 10 in the longitudinal direction, i.e., to a side surface of the energy storage unit 10 in the negative Y-axis direction. Specifically, the board unit 20 is rotatably attached to a board unit attachment portion 16 (see FIG. 2) provided on the front surface of an exterior body support 15 included in an exterior body 18 of the energy storage unit 10. The board unit attachment portion 16 is a part of the connection portion 15b. More specifically, a downward U-shaped holding portion is provided below the board unit attachment portion 16, and the rotation shaft of the board unit 20 is housed in the holding portion.

[0043] As shown in FIG. 1B and FIG. 1C, the board unit 20 includes cable guides 21 and 22 and a communication cable connector 23. The communication cable connector 23 is composed of an input connector and an output connector. The cable guides 21 and 22 each have a pair of guide walls. The communication cable is not shown. The communication cable is a cable for communication between the power storage devices 1, connecting the multiple power storage devices 1. One of the communication cables connected to the terminal power storage device 1 among the mutually connected power storage devices 1 is connected to a control device of the entire power storage device group. Here, since the communication cable connected to the power storage device 1 is arranged vertically or horizontally on the front surface of the power storage device 1, there is a problem that the cable itself is prone to movement and is troublesome to handle. In this embodiment, the board unit 20 has the cable guides 21 and 22, and the communication cable is housed in a pair of guide walls, so that the movement of the communication cable is suppressed and handling is easy. The connection between the multiple power storage devices 1 by the communication cable can be vertical or horizontal. The cable guide 21 has a guide wall extending in the Z-axis direction, and can accommodate and fix a vertical communication cable. The cable guide 22 has a guide wall extending in the X-axis direction, and can accommodate and fix a horizontal communication cable. As a result, the power storage devices 1 can be connected to each other by communication cables in both the vertical and horizontal directions.

[0044] [2 Busbar frame] Next, a description will be given of the details of the bus bar frame 12. Fig. 3 is an exploded perspective view showing a schematic configuration of the exhaust unit 50 and the bus bar frame 12 according to the first embodiment. Specifically, Fig. 3 is a perspective view of the exhaust unit 50 and the bus bar frame 12 as viewed from above.

[0045] 3, bus bar frame 12 is a frame-like member disposed on multiple energy storage elements 11 and holding multiple bus bars 13. Specifically, bus bar frame 12 has a first holding portion 71, a second holding portion 72, and a connecting portion 73. Here, of the multiple detection wires 13a, the multiple detection wires 13a held by the first holding portion 71 are referred to as first detection wires. Also, of the multiple detection wires 13a, the multiple detection wires 13a held by the second holding portion 72 are referred to as second detection wires.

[0046] The first holding portion 71 is a portion on the X-axis positive side (one side) of the bus bar frame 12, and holds the first bus bar group, the positive power cable 31, and the multiple first detection wires. The multiple first detection wires are connected to the electrode terminals (positive electrode terminals 11b or negative electrode terminals 11c) of each energy storage element 11 in the X-axis positive direction, or to the bus bars 13 included in the first bus bar group.

[0047] The first holding portion 71 is disposed in the positive direction of the X-axis further from the gas release valves 111 of the energy storage elements 11. The first holding portion 71 has a first outer wall portion 711 that surrounds the outer periphery of the first holding portion 71.

[0048] The first outer wall portion 711 is a frame wall that is long in the Y-axis direction and has a rectangular shape when viewed from above, and accommodates the first busbar group, the positive power cable 31, and a plurality of first detection wires inside. A pair of first notches 711a and 711b are formed at the end of the first outer wall portion 711 in the negative Y-axis direction. The first notch 711a of the pair of first notches 711a and 711b is arranged so that the positive power cable 31 and a plurality of first detection wires pass through it. The other first notch 711b is arranged so that the negative power cable 32 passes through it.

[0049] Within the first outer wall portion 711, an end region in the negative X-axis direction is a first cable path portion 715 that penetrates along the Y-axis direction. The first cable path portion 715 is disposed between the gas exhaust valve 111 of each energy storage element 11 and each bus bar 13 included in the first bus bar group. In this manner, within the bus bar frame 12, the first cable path portion 715 is disposed inward in the X-axis direction from the first bus bar group.

[0050] The positive power cable 31 and the multiple first detection lines are arranged in the first cable path section 715. The first cable path section 715 forms a wiring path for the positive power cable 31 and the multiple first detection lines. The multiple first detection lines and the positive power cable 31 are arranged in the first cable path section 715, and thus are arranged between the first holding section 71 and the second holding section 72, that is, avoiding being located on the connecting section 73.

[0051] The second holding portion 72 is a portion on the negative X-axis direction side (the other side) of the busbar frame 12. The second holding portion 72 holds the second busbar group and the electrode terminals (positive electrode terminals 11b or negative electrode terminals 11c) of each energy storage element 11 in the negative X-axis direction, or a plurality of second detection wires connected to the busbars 13 included in the second busbar group.

[0052] The second holding portion 72 is disposed in the negative X-axis direction relative to the gas release valves 111 of the energy storage elements 11. The second holding portion 72 has a second outer wall portion 721 that surrounds the outer periphery of the second holding portion 72.

[0053] The second outer wall portion 721 is a frame wall that is long in the Y-axis direction and has a rectangular shape when viewed from above, and accommodates the second busbar group and the multiple second detection wires therein. A second cutout 721a is formed at an end portion of the second outer wall portion 721 in the negative Y-axis direction. The multiple second detection wires are arranged to pass through the second cutout 721a.

[0054] An end region in the positive direction of the X-axis within the second outer wall portion 721 is a second cable path portion 725 that penetrates along the Y-axis direction. The second cable path portion 725 is disposed between the gas exhaust valve 111 of each energy storage element 11 and each bus bar 13 included in the second bus bar group. In this manner, the second cable path portion 725 is disposed inward in the X-axis direction from the second bus bar group within the bus bar frame 12.

[0055] A plurality of second detection lines are arranged in the second cable path portion 725. The plurality of second detection lines are arranged in the second cable path portion 725, and thereby are arranged between the first holding portion 71 and the second holding portion 72, that is, avoiding above the connecting portion 73.

[0056] As shown in FIG. 3, the connecting portion 73 is a portion that connects the first holding portion 71 and the second holding portion 72. Specifically, the connecting portion 73 has a plurality of beam portions 731 that extend in the X-axis direction and have one end connected to the first holding portion 71 and the other end connected to the second holding portion 72. The plurality of beam portions 731 are arranged at predetermined intervals in the Y-axis direction. The exhaust portion 50 is arranged on the plurality of beam portions 731. Among the plurality of beam portions 731, the beam portion 731 at the end in the negative Y-axis direction is arranged outside the energy storage element 11 at the end in the negative Y-axis direction. In addition, the beam portion 731 at the end in the positive Y-axis direction is arranged outside the energy storage element 11 at the end in the positive Y-axis direction. The other beam portions 731 are arranged between a pair of adjacent energy storage elements 11. In this manner, the plurality of beam portions 731 are arranged at positions retreated from the gas exhaust valves 111 of the energy storage elements 11. In other words, gas release valve 111 of each energy storage element 11 is exposed between beam portions 731 in top view.

[0057] The portion of the first outer wall portion 711 facing the connecting portion 73 and the portion of the second outer wall portion 721 facing the connecting portion 73 are a pair of third wall portions 716 facing each other. Each third wall portion 716 is a flat, rectangular portion parallel to the YZ plane and extending in the Y-axis direction. Between the pair of third wall portions 716, the exhaust portion 50 is housed on the multiple beam portions 731. A plurality of pairs of recesses are formed on the upper edge portions of the pair of third wall portions 716 to position the exhaust portion 50. In this embodiment, two pairs of recesses are provided. The first set of recesses is a pair of first recesses 717 arranged in the Y-axis positive direction from the center of the bus bar frame 12 in the Y-axis direction. The pair of first recesses 717 are each formed in a rectangular shape with an open upper portion as viewed in the X-axis direction, and are arranged at the same position in the Y-axis direction. The second set of recesses is a pair of second recesses 727 arranged in the Y-axis negative direction from the center of the bus bar frame 12 in the Y-axis direction. The pair of second recesses 727 are each formed in a rectangular shape that is open at the top when viewed in the X-axis direction, and are disposed at the same position in the Y-axis direction. In this manner, the bus bar frame 12 that houses the exhaust unit 50 in the connecting portion 73 is an example of a frame member.

[0058] [3 Exhaust section] 3 to 5, exhaust section 50 has exhaust member 60, cover member 65, and a plurality of seal members 95. Exhaust member 60 and cover member 65 form exhaust path 59.

[0059] Fig. 4 is an exploded perspective view showing a schematic configuration of exhaust section 50 and exterior body cover 17 according to the first embodiment. Specifically, Fig. 4 is a perspective view of exhaust section 50 and exterior body cover 17 as viewed from below. Fig. 5 is a cross-sectional view of the periphery of exhaust section 50, taken along a plane perpendicular to the Y-axis of electricity storage device 1 according to the first embodiment shown in Fig. 1. Specifically, it is a cross-sectional view showing first divided body 66, which is a part of exhaust section 50, and its surrounding members.

[0060] [3-1 Exhaust parts] The exhaust member 60 is disposed directly above the gas exhaust valves 111 of the energy storage elements 11 in a state where the exhaust member 60 is housed in the bus bar frame 12 as a whole. The exhaust member 60 includes a bottom 61 and a pair of first wall portions 62. The bottom 61 is a rectangular portion parallel to the XY plane and extending in the Y-axis direction. The pair of first wall portions 62 are portions erected from both ends of the bottom 61 in the X-axis direction. The length of the exhaust member 60 in the Y-axis direction corresponds to the overall length of the exterior body main body 14 in the Y-axis direction. Therefore, the exhaust member 60 can be entirely housed within the exterior body main body 14. The exhaust member 60 is divided into two at a middle position in the Y-axis direction. One of the two is a first divided body 66, and the other is a second divided body 67. The first divided body 66 and the second divided body 67 have approximately the same length in the Y-axis direction. The first divided body 66 is disposed in the Y-axis positive direction with respect to the second divided body 67. In other words, the first divided body 66 is disposed on the exhaust port 51 side of the exhaust path 59 .

[0061] The exhaust member 60 consisting of the first division 66 and the second division 67 is made of a resin having high heat resistance since it serves as an exhaust path for high-temperature gas discharged from the energy storage elements 11. In this embodiment, the first division 66 and the second division 67 are made of polyphenylene sulfide (PPS), which is a resin material having high heat resistance. Here, the bus bar frame 12 does not need to have heat resistance, and is made of PP, which is a normal resin material having lower heat resistance than the exhaust member 60. When the bus bar frame 12, the first division 66, and the second division 67 are integrally molded from a single resin, the entirety may be molded from a resin having high heat resistance. However, in this embodiment, only the first division 66 and the second division 67, which are separate from the bus bar frame 12, need to be made from a resin having high heat resistance, so that the amount of the resin used can be reduced.

[0062] Exhaust member 60 is an elongated member extending in the Y-axis direction which is the arrangement direction of energy storage elements 11. In this embodiment, since PPS, which is a heat-resistant resin, has poorer moldability than ordinary resin materials such as PP, exhaust member 60 is formed as a member divided in the Y-axis direction rather than as an integrally molded product in order to make it easier to mold.

[0063] [3-1-1 First split body] Figures 6 and 7 are perspective views showing a schematic configuration of the first division body 66 and the second division body 67 according to embodiment 1. Specifically, Figure 6 is a perspective view of the first division body 66 and the second division body 67 seen from above, and Figure 7 is a perspective view of the first division body 66 and the second division body 67 seen from below.

[0064] 5 to 7, the first divided body 66 is formed in a U-shape with an open upper portion when viewed in the Y-axis direction, and is a member that is elongated in the Y-axis direction. The first divided body 66 includes a first bottom portion 661 and a pair of first divided wall portions 662. The first bottom portion 661 is a rectangular portion that is parallel to the XY plane and extends in the Y-axis direction, and forms a part of the bottom portion 61.

[0065] A pair of first dividing walls 662 are erected on the upper surface of both ends in the X-axis direction of the first bottom portion 661. A pair of first grooves 663 extending along the Y-axis direction are formed on the upper surface of the first bottom portion 661 near each of the first dividing walls 662. Each of the second walls 652 of the cover member 65 is disposed in each of the first grooves 663.

[0066] A plurality of first holes 664 (eight in this embodiment) exposing the gas release valves 111 of the energy storage elements 11 are formed in the center of the first bottom 661 in the X-axis direction. The plurality of first holes 664 are arranged at predetermined intervals along the Y-axis direction. The first holes 664 are through-holes formed in a circular shape in a plan view. The first holes 664 may have any shape in a plan view, and other shapes in a plan view include an elliptical shape, an oval shape, and a polygonal shape.

[0067] The outer bottom surface of the first bottom portion 661 is provided with a plurality of annular convex portions 665 surrounding each of the first holes 664. The annular convex portion 665 is a convex streak portion formed continuously in a circular shape in a plan view, and is arranged concentrically with the first holes 664. The shape of the annular convex portion 665 in a plan view may be any shape as long as it is a continuous ring shape, and other shapes in a plan view include an elliptical ring shape, an oval ring shape, a polygonal ring shape, and the like. The annular convex portion 665 has a tapered cross section when cut on a plane perpendicular to the circumferential direction of the annular convex portion (see FIG. 5). The annular convex portion 665 has a uniform cross section shape over the entire circumference. In this embodiment, the cross section of the annular convex portion 665 is tapered as a whole, but only the tip portion may be tapered. In this embodiment, the tip portion of the annular convex portion 665 is formed on a flat surface, but may be formed in an angular shape. Furthermore, a flange portion 669 that forms a first hole portion 664 is provided continuously in the circumferential direction inside the annular protrusion portion 665. The flange portion 669 is an annular portion that protrudes inward in the planar direction of the XY plane from the annular protrusion portion 665. The inner diameter of the first hole portion 664 is smaller than when the flange portion 669 is not provided.

[0068] Further, a plurality of positioning protrusions 666 protruding downward are formed on the outer bottom surface of the first bottom portion 661. The positioning protrusions 666 are portions that abut against one of the energy storage elements 11, thereby determining the relative positioning of the energy storage element 11 and the first divided body 66.

[0069] The positioning protrusions 666 protrude from any position in the Y-axis direction of the first divided body 66 toward any one of the energy storage elements 11. Specifically, the positioning protrusions 666 are disposed in the vicinity of the fourth first hole portion 664 from one end of the first divided body 66 in the Y-axis negative direction. That is, the positioning protrusions 666 abut against the fourth energy storage element 11 from one end of the first divided body 66 in the Y-axis negative direction. In this manner, the positioning protrusions 666 are disposed only in the center of the first divided body 66 in the Y-axis direction. Here, the center of the first divided body 66 is a region including the center position in the Y-axis direction. Specifically, the region of the first divided body 66 that overlaps with the fourth and fifth energy storage elements 11 from the end of the eight energy storage elements 11 corresponding to the first divided body 66 in a top view is defined as the center of the first divided body 66.

[0070] Fig. 8 is a plan view showing a schematic positional relationship between a plurality of positioning protrusions 666 according to the first embodiment and the energy storage element 11. As shown in Fig. 8, in the present embodiment, four positioning protrusions 666 are provided on the first divided body 66. The four positioning protrusions 666 are classified into a pair of first positioning protrusions 666a that abut against the fourth energy storage element 11 from the positive direction of the Y axis and a pair of second positioning protrusions 666b that abut against the fourth energy storage element 11 from the negative direction of the Y axis.

[0071] The pair of first positioning protrusions 666a are arranged at a predetermined interval in the X-axis direction. The pair of second positioning protrusions 666b are disposed at positions corresponding to the pair of first positioning protrusions 666a in the X-axis direction.

[0072] Fig. 9 is a cross-sectional view showing a schematic configuration of a positioning protrusion 666 according to an embodiment. Fig. 9 shows a state in which the first divided body 66 is in the middle of being assembled to the energy storage device 11. Fig. 9 also shows one of the pair of first positioning protrusions 666a and one of the pair of second positioning protrusions 666b, but the other of the pair of first positioning protrusions 666a and the other of the pair of second positioning protrusions 666b are similar, so description thereof will be omitted.

[0073] The first positioning protrusion 666a and the second positioning protrusion 666b are a pair of positioning protrusions 666 arranged at positions sandwiching the energy storage element 11 in the Y-axis direction. The first positioning protrusion 666a protrudes downward from the outer bottom surface of the first bottom portion 661. The first positioning protrusion 666a is a substantially rectangular protrusion, and a corner 666c of the tip portion facing the energy storage element 11 is chamfered.

[0074] One of the second positioning projections 666b protrudes downward from the outer bottom surface of the first bottom portion 661. One of the second positioning projections 666b is a substantially rectangular projection, and a corner 666d of the tip portion facing the energy storage element 11 is chamfered.

[0075] That is, the interval between the first positioning protrusion 666a on one side and the second positioning protrusion 666b on the other side is gradually narrowed upward by the corners 666c and 666d. Therefore, when the first divided body 66 is assembled to the energy storage element 11, the upper part of the energy storage element 11 is guided by the corners 666c and 666d to fit into a predetermined position and abuts against each positioning protrusion 666. After positioning, as shown in FIG. 8, all the positioning protrusions 666 are in abutment against the energy storage element 11. Specifically, the energy storage element 11 is sandwiched between a pair of first positioning protrusions 666a and a pair of second positioning protrusions 666b. Therefore, positional deviation between the first divided body 66 and the energy storage element 11 in the Y-axis direction and in the rotational direction about the Z-axis is restricted, and the first divided body 66 can be accurately aligned with one energy storage element 11.

[0076] The first divided body 66 is positioned in the X-axis direction by being disposed between a pair of third wall portions 716 of the bus bar frame 12. Furthermore, the first divided body 66 is placed on the energy storage element 11, and therefore is positioned in the Z-axis direction.

[0077] Here, the energy storage element 11 has a flat shape in which the thickness (dimension in the Y-axis direction) is smaller than the width (dimension in the X-axis direction). Therefore, in the upper wall portion 11d of the energy storage element 11, the distance from the gas release valve 111 to the edge of the upper wall portion 11d in the thickness direction of the energy storage element 11 is smaller than the distance in the width direction, and the difference is also large. In other words, around the gas release valve 111, the space is narrow in the thickness direction and wide in the width direction. Therefore, when other members are arranged around the gas release valve 111, the member arrangement area is relatively narrow on the side of the gas release valve 111 in the Y-axis direction (arrangement direction of the energy storage elements 11) and relatively wide on the side in the X-axis direction. Examples of members arranged around the gas release valve 111 include the annular protrusion 665 of the first divided body 66 and the seal material 95.

[0078] Since the component arrangement area is narrow on the side of the gas release valve 111 in the Y-axis direction, it is necessary to suppress misalignment in order to arrange other components in this area. In the present embodiment, the first positioning protrusions 666a, 666b of the first divided body 66 are positioned by directly abutting them against the long side surface of the energy storage element 11 from the Y-axis direction without using any other components. This makes it possible to easily and accurately align the positions of the annular protrusion 665 of the first divided body 66 and the gas release valve 111.

[0079] At least one first positioning protrusion 666 may be in contact with any one of the energy storage elements 11, and may be in contact with, for example, the endmost energy storage element 11 in the arrangement direction. In this embodiment, the multiple energy storage elements 11 are arranged at predetermined positions in the exterior body 14, so that when the first divided body 66 is positioned with respect to the endmost energy storage element 11, it is arranged so as to have a predetermined positional relationship with respect to the other energy storage elements 11. In this case, it is preferable to abut against the long side surface of the energy storage element 11 as in this embodiment, but the abutment method is not limited thereto. For example, it may be a positioning protrusion that protrudes so as to face the upper wall portion 11d of the energy storage element 11. In addition, it is preferable that the first positioning protrusion 666 abuts against another long side surface, rather than the outermost long side surface, of the multiple arranged energy storage elements 11. As will be described in more detail later, the first hole portions 664 are present on both sides of the positioning protrusion 666 in the Y-axis direction, so that the distance from the positioning protrusion 666 to the farthest first hole portion 664 can be shortened as much as possible, thereby preventing an increase in tolerance.

[0080] The installation position of the positioning protrusion 666 in the first divided body 66 can be arranged at a position corresponding to any power storage element 11. One example is the arrangement at a position in contact with the power storage element 11 at the outermost end in the arrangement direction as described above, but it may also be an arrangement at a position in contact with the second power storage element 11 from the arrangement end. Here, when the center of the first hole 664 (referred to as 664a) corresponding to the power storage element 11 with which the positioning protrusion 666 is in contact is taken as the reference position, as shown in FIG. 8, the actual dimension of the distance from the reference position to the center of each first hole 664 increases as the distance from the reference position increases, and the variation from the design value becomes larger. That is, the tolerance of the distance to the center of the first hole 664 increases as the distance from the reference position increases (in FIG. 8, the tolerances are t1 < t2 < t3 < t4). Therefore, when the reference position is set to the first hole 664 at the outermost end of the first divided body 66, the tolerance of the distance from the reference position to the first hole 664 at the opposite end is the largest. On the other hand, as shown in FIG. 8, when the positioning protrusion 666 is set at the central portion of the first divided body 66, the dimension (tolerance of the "distance") to the first hole 664 farthest from the reference position is approximately half of that when the reference position is set at the end, and it is preferable because positioning can be accurately performed without widening the tolerance. Also, in the Y-axis direction, the space on which the annular convex portion 665 is placed is narrower than in the X-axis direction. That is, in the Y-axis direction, higher accuracy is required than in the X-axis direction, but as described above, it is preferable that the installation accuracy of the first divided body 66 in the Y-axis direction is improved by the positioning protrusion 666.

[0081] As shown in FIGS. 5 to 7, the pair of first divided wall portions 662 are portions erected from the upper surfaces of both ends of the first bottom portion 661 in the X-axis direction and form part of the first wall portion 62. The pair of first divided wall portions 662 are erected from the first bottom portion 661 in a state inclined in the Z-axis direction such that the distance between them increases upward (see FIG. 5). Each first divided wall portion 662 is a long plate-shaped and rectangular portion along the Y-axis direction. At a predetermined position in the Y-axis direction in each first divided wall portion 662, a convex first interference portion 668 protruding outward is formed. Each first interference portion 668 is at the upper end portion of each first divided wall portion 662 and is arranged at approximately the central portion of each first divided wall portion 662 in the Y-axis direction.

[0082] Fig. 10 is a cross-sectional view showing each first interference portion 668 and its surrounding members according to embodiment 1. As shown in Fig. 10, each first interference portion 668 is housed in a pair of first recesses 717 of the bus bar frame 12. As a result, each first interference portion 668 is disposed on the boundary between each third wall portion 716 of the bus bar frame 12 and each first partition wall portion 662.

[0083] 6 and 7, a first engagement portion 68 is formed at one end of the first divided body 66 in the negative Y-axis direction, which engages with the other end of the second divided body 67 in the positive Y-axis direction. The first engagement portion 68 has an overlap portion 681 and a first flange portion 682.

[0084] The overlapping portion 681 is a portion that overlaps with the other end of the second divided body 67 when viewed in the Z-axis direction (plan view). Specifically, the overlapping portion 681 protrudes in the negative Y-axis direction from one end of the first bottom portion 661 of the first divided body 66. In other words, the overlapping portion 681 protrudes from one end of the first bottom portion 661 toward the second divided body 67. The overlapping portion 681 is a flat, rectangular portion that is parallel to the XY plane and extends in the Y-axis direction.

[0085] The first flange 682 protrudes downward from one end of the first bottom 661 of the first division 66. That is, the first flange 682 protrudes toward the energy storage element 11. The first flange 682 is a flat rectangular portion that is parallel to the XZ plane and extends in the Z-axis direction. The engagement relationship between the first engagement portion 68 and the second division 67 will be described later.

[0086] [3-1-2 Second split body] Next, the second divided body 67 will be described. The second divided body 67 basically has the same configuration as the first divided body 66, so first, the corresponding relationship between each part of the second divided body 67 and each part of the first divided body 66 will be described, and a detailed description thereof will be omitted. After that, the differences from the first divided body 66 will be described in detail.

[0087] As shown in Fig. 6 and Fig. 7, the second divided body 67 is formed in a U-shape with an open upper portion as viewed in the Y-axis direction, and is a member that is long in the Y-axis direction. The second divided body 67 has a second bottom 671 corresponding to the first bottom 661, and a pair of second divided wall portions 672 corresponding to each of the first divided wall portions 662. The second bottom portion 671 is provided with a pair of second grooves 673 corresponding to each of the first grooves 663, a plurality of second hole portions 674 corresponding to each of the first hole portions 664, a plurality of annular convex portions 675 corresponding to each of the annular convex portions 665, and a plurality of positioning protrusions 676 corresponding to each of the positioning protrusions 666. The plurality of positioning protrusions 676 are arranged in the vicinity of the fourth first hole portion 664 from the other end portion of the second divided body 67 in the Y-axis positive direction.

[0088] Further, the pair of second partition wall portions 672 are provided with a plurality of second interference portions 678 corresponding to the first interference portions 668. The second interference portions 678 are housed in the pair of second recesses 727 of the bus bar frame 12. Because of this correspondence, the respective portions of the second partition 67 can achieve the same effects as the corresponding portions of the first partition 66.

[0089] Next, a detailed description will be given of portions of the second divided body 67 that are different from the first divided body 66. In the second divided body 67, a terminal wall portion 677 for blocking the exhaust path 59 is formed at one end in the negative Y-axis direction, continuing from the second bottom portion 671 and the pair of second divided walls 672. The terminal wall portion 677 is a flat rectangular portion parallel to the XZ plane. The terminal wall portion 677 prevents the gas flowing through the exhaust path 59 from leaking out from the end of the power storage device 1 in the negative Y-axis direction.

[0090] Further, a second engagement portion 69 that engages with the first engagement portion 68 of the first divisional body 66 is formed on the other end portion of the second divisional body 67 in the positive Y-axis direction.

[0091] 11 is a cross-sectional view showing an engagement relationship between the first engagement portion 68 and the second engagement portion 69 according to embodiment 1. As shown in FIGS. 6, 7, and 11, the second engagement portion 69 has an accommodating recess 691 and a second flange portion 692.

[0092] The accommodation recess 691 is a portion that accommodates the overlapping portion 681. Specifically, the accommodation recess 691 is formed on the upper surface of the other end of the second bottom portion 671. The accommodation recess 691 is formed in a shape that can accommodate the overlapping portion 681 when viewed in the Z-axis direction. For example, the accommodation recess 691 is a recess that is recessed in the negative Z-axis direction with an end in the positive Y-axis direction open, and has a bottom at the bottom. When the overlapping portion 681 is accommodated in the accommodation recess 691, the overlapping portion 681 overlaps with the other end of the second divided body 67 in a plan view (when viewed in the Z-axis direction). As a result, the gap at the adjacent portions of the first divided body 66 and the second divided body 67 becomes a curved space when viewed in a cross section, making it difficult for gas to pass through, and gas leakage from the adjacent portions is suppressed.

[0093] In addition, the tip of the overlapping portion 681 accommodated in the accommodation recess 691 is disposed at a distance S1 from the wall surface of the accommodation recess 691 in the Y-axis direction. For example, due to the variation in the dimensional tolerances in the longitudinal direction of the first division body 66 and the second division body 67, there is a risk that the tip of the overlapping portion 681 in the Y-axis direction and the wall surface of the end of the accommodation recess 691 in the Y-axis direction may interfere with each other. If interference occurs, it may lead to defective assembly of the energy storage device 1. In this embodiment, even if the first division body 66 and the second division body 67 are assembled using members each having the maximum value within the dimensional tolerance, the tip of the overlapping portion 681 is configured to be spaced at a distance S1 from the other end of the second division body 67. This distance S1 can absorb the dimensional variation between the first division body 66 and the second division body 67, and can suppress the occurrence of defective assembly. In addition, even when the first divisional body 66 and the second divisional body 67 are assembled using members each having a minimum value within the dimensional tolerance, in this embodiment, the overlapping portion 681 is configured to cover the upper part of the other end of the second divisional body 67. This suppresses gas leakage from the adjacent parts of the first divisional body 66 and the second divisional body 67. In addition, when the first divisional body 66 and the second divisional body 67 are manufactured with high dimensional accuracy and the tip of the overlapping portion 681 is brought into contact with the other end of the second divisional body 67, the gap S1 is eliminated, which is preferable, and gas leakage can be suppressed. In addition, FIG. 11 illustrates an example in which the bottom surface of the overlapping portion 681 is spaced from the bottom of the accommodation recess 691 in the Z-axis direction, but the bottom surface of the overlapping portion 681 may be in contact with the bottom of the accommodation recess 691. In this case, gas leakage can be further suppressed.

[0094] The second flange 692 protrudes downward from the other end of the second bottom 671 of the second divided body 67. That is, the second flange 692 protrudes toward the energy storage element 11. The second flange 692 is a flat rectangular portion parallel to the XZ plane and extending in the Z-axis direction. The second flange 692 faces the first flange 682 with a gap S2 in the Y-axis direction. Here, if the gap S2 is smaller than the gap S1, the second flange 692 and the first flange 682 may come into contact with each other before the maximum amount of dimensional variation within the tolerance that the gap S1 can absorb is satisfied, and the desired effect of absorbing dimensional variation may not be obtained. For this reason, the gap S2 between the second flange 692 and the first flange 682 is set to be equal to or larger than the gap S1.

[0095] It is also assumed that the first divisional body 66 and the second divisional body 67 may be misaligned in the arrangement direction (Z-axis direction) of the energy storage element 11 and the exhaust section 50 due to their respective tolerances. In this embodiment, a first flange 682 is formed at one end of the first bottom portion 661, and a second flange 692 facing the first flange 682 in the Y-axis direction is formed at the other end of the second bottom portion 671. Therefore, even if the first divisional body 66 and the second divisional body 67 are misaligned in the Z-axis direction, the opposing relationship between the first flange 682 and the second flange 692 can be maintained, and the gap between the adjacent portions of the first divisional body 66 and the second divisional body 67 can be narrowed. As a result, gas leakage can be suppressed even if the first divisional body 66 and the second divisional body 67 are misaligned in the Z-axis direction.

[0096] Furthermore, by providing a first flange 682 on first division 66 and a second flange 692 on second division 67, a creeping distance is ensured between energy storage elements 11 and an end of second wall portion 652 of cover member 65, which is a metal member, at the boundary between first division 66 and second division 67. Also, by providing a third flange 683 at the end of second division 67 on the Y-axis positive direction side (exhaust port 51 side), a creeping distance is ensured between energy storage elements 11 and an end of second wall portion 652 of cover member 65, which is a metal member, at the end of first division 66 on the exhaust port 51 side.

[0097] Here, a case where the gas exhaust valve 111 of the energy storage element 11 is operated will be described. When the gas exhaust valve 111 is operated and the high-temperature gas is exhausted to the outside from the exhaust path 59, the gas may come into contact with air (oxygen) at the exhaust port of the exhaust path 59 and ignite. Here, the energy storage element 11 on the first divided body 66 side of the exhaust member 60 and close to the exhaust port 51 is likely to come into contact with air (oxygen) and may ignite. Conversely, since the end of the exhaust path 59 on the positive side of the Y axis is blocked, the energy storage element 11 on the second divided body 67 side is unlikely to come into contact with air (oxygen) and is unlikely to ignite. In addition, the temperature of the gas from the energy storage element 11 on the second divided body 67 side is reduced while passing through the exhaust path 59 toward the exhaust port 51, and the possibility of ignition is reduced. There are gaps S1 and S2 at the boundary between the first divided body 66 and the second divided body 67 in the middle of the exhaust path 59, but these gaps S1 and S2 are small compared to the exhaust port 51, and the gas is prevented from coming into contact with air (oxygen). When gas is discharged from the electric storage element 11 close to the exhaust port 51 on the first division 66 side, most of the gas flows toward the exhaust port 51. When the gas discharged from the exhaust port 51 ignites, the fire may flow around to the electric storage device 1 side and enter the exhaust path 59 from the boundary portion (gaps S1, S2) between the first division 66 and the second division 67, and reach the gas exhaust valve 111 of the other normal electric storage element 11. The other electric storage element 11 on the first division 66 side is exposed to high temperatures due to the electric storage element 11 whose gas exhaust valve 111 has been activated, so there is a possibility that the fire may spread to the other electric storage element 11. In this embodiment, the overlap portion 681 of the first division 66 is extended toward the opposite side to the exhaust port 51 (negative direction of the Y axis), and the overlap portion 681 is disposed above the other end of the second division 67. Therefore, the fire that has entered from the boundary portion can be deflected to the second division 67 side (positive direction of the Y axis) that is relatively unaffected by heat. The fire that is received by the second divided body 67 side weakens, and the spread of the fire can be prevented.

[0098] [3-1-3 Location of the first and second interference parts] Next, a description will be given of the locations of the first interference portions 668 of the first division body 66 and the second interference portions 678 of the second division body 67. Fig. 12 is a plan view showing a schematic view of the first division body 66 and the second division body 67 according to the embodiment.

[0099] As shown in FIG. 12, in the first divided body 66, a pair of first interference parts 668 are arranged at positions that are not point symmetrical with respect to the center G1 of the first divided body 66 in a plan view. Specifically, the pair of first interference parts 668 are arranged at positions shifted from the center G1 by a first distance L1 in the positive Y-axis direction. Therefore, when the first divided body 66 is rotated 180 degrees around the Z-axis with the center G1 as the reference, the pair of first interference parts 668 are arranged at positions shifted from the center G1 by the first distance L1 in the negative Y-axis direction (broken line parts in the first divided body 66 in FIG. 12). Each first recess 717 of the busbar frame 12 has a function of positioning the first divided body 66 before rotation. Therefore, if each first interference part 668 of the first divided body 66 after rotation is accommodated in each first recess 717, the first divided body 66 will be shifted in position by about twice the first distance L1 in the Y-axis direction. This allows an assembly worker to know at a glance that the first divided body 66 is misaligned. Even if an operator misses it, the positional deviation can be detected by the inability to perform the assembly in that process.

[0100] Similarly, in the second divided body 67, a pair of second interference portions 678 are arranged at positions that are not point symmetrical with respect to the center G2 of the second divided body 67 in a plan view. Furthermore, the pair of second interference portions 678 have a different positional relationship in a plan view from the pair of first interference portions 668 of the first divided body 66. Specifically, each second interference portion 678 is disposed at a position shifted from the center G2 by a second distance L2 in the Y-axis positive direction. Here, the second distance L2 is different from the first distance L1, so that each first interference portion 668 and each second interference portion 678 have a different positional relationship in a plan view. Each first interference portion 668 and each second interference portion 678 are shifted in position by a distance L10 in the Y-axis direction. In this embodiment, a case where the second distance L2 is smaller than the first distance L1 is illustrated, but the second distance L2 may be larger than the first distance L1.

[0101] For example, when the second divided body 67 is rotated 180 degrees around the Z axis with the center G2 as a reference, the pair of second interference parts 678 are disposed at a position shifted from the center G2 in the negative Y-axis direction by the second distance L2 (the dashed line part of the second divided body 67 in FIG. 12). Each second recess 727 of the busbar frame 12 has a function of positioning the second divided body 67 before rotation. Therefore, when each second interference part 678 of the second divided body 67 after rotation is accommodated in each second recess 727, the second divided body 67 is shifted in position by about twice the second distance L2 in the Y-axis direction. This allows the worker to know at a glance that the second divided body 67 is misaligned. Even if the worker misses it, the misalignment can be detected because the assembly process cannot be performed.

[0102] Also, assume that the second divided body 67 before rotation is erroneously placed at the arrangement position of the first divided body 66. Specifically, this is a case where each second interference portion 678 of the second divided body 67 before rotation is to be accommodated in each first recess 717 for the first divided body 66 of the bus bar frame 12. In this case, the second divided body 67 is misaligned in the Y-axis direction from the correct position of the first divided body 66 by about a distance L10. Even if the second divided body 67 after rotation is misaligned at the arrangement position of the first divided body 66, the second divided body 67 is also misaligned in the Y-axis direction from the correct position of the first divided body 66. In either case, the worker can at a glance know that the second divided body 67 is misaligned. Even if the worker misses it, the misalignment can be detected because the assembly of the process cannot be performed. This is also the case when the first divided body 66 is misaligned at the installation position of the second divided body 67.

[0103] [3-2 Lid parts] As shown in FIGS. 3 to 5, the cover member 65 is disposed above the exhaust member 60, closes the open portion of the exhaust member 60, and covers the upper part of the exhaust path 59. Specifically, the cover member 65 is made of metal and has higher heat dissipation properties than the exhaust member 60. The cover member 65 is formed in a U-shape with an open lower side as viewed in the Y-axis direction, and is a member that is long in the Y-axis direction. The cover member 65 is housed in the exhaust member 60 that is composed of a first divided body 66 and a second divided body 67. The length of the cover member 65 in the Y-axis direction is longer than the entire length of the exhaust member 60 in the Y-axis direction. Therefore, the other end of the cover member 65 in the Y-axis positive direction can be protruded from the exhaust member 60.

[0104] The other end of the cover member 65 in the positive Y-axis direction is open downward and at the tip end while protruding from the exhaust member 60. Meanwhile, the front wall 659 of the cover member 65 in the negative Y-axis direction is closed. This front wall 659 is a flat, rectangular portion parallel to the XZ plane, and covers the end wall 677 of the second divided body 67 from the outside. That is, the front wall 659 of the cover member 65 and the end wall 677 of the second divided body 67 prevent gas from being discharged from one end in the Y-axis direction. The cover member 65 constitutes a gas exhaust path 59 together with the exhaust member 60 while being housed in the exhaust member 60. Gas is discharged from the open portion at the other end of the cover member 65 described above. That is, the other end of the cover member 65 is the exhaust port 51 through which gas is discharged. As a result, the exhaust port 51 is U-shaped when viewed in the gas traveling direction (Y-axis direction). Specifically, exhaust port 51 has a U-shape with an open portion facing downward. As described above, exhaust port 51 in cover member 65 protrudes from exterior body 18 by penetrating opening 171 and notch portion 141 of exterior body main body 14.

[0105] Lid member 65 includes a lid portion 651 and a pair of second walls 652, which together form a U-shaped external shape when viewed in the Y-axis direction. Lid portion 651 is a plate portion that is open downward. Lid portion 651 is attached to top plate portion 17a of exterior body lid 17, and lid member 65 and exterior body lid 17 are integrated together.

[0106] The pair of second wall portions 652 extend downward from both ends in the X-axis direction of the cover portion 651. Specifically, each second wall portion 652 is a plate-like rectangular portion parallel to the YZ plane and extending in the Y-axis direction.

[0107] Each second wall portion 652 is accommodated so as to be adjacent to the pair of first wall portions 62 of the exhaust member 60 on the inner side in the X-axis direction. Specifically, each second wall portion 652 is adjacent to each of the pair of first divided wall portions 662 of the first divided body 66 and the pair of second divided wall portions 672 of the second divided body 67. In this state, the tip portion of each second wall portion 652 is accommodated in each first groove 663 of the first divided body 66 and each second groove 673 of the second divided body 67, and abuts against the bottom surface of each groove portion. Therefore, the sealing performance between each second wall portion 652 and the exhaust member 60 can be improved compared to the case where the lower end of each second wall portion 652 abuts against a flat surface. Each second wall portion 652 overlaps a portion where the first divided wall portion 662 of the first divided body 66 and the second divided wall portion 672 of the second divided body 67 are adjacent to each other so as to cover the gap of this portion from the inside. Thereby, each second wall portion 652 suppresses gas leakage from the gap.

[0108] In this state, the lid portion 651 of the lid member 65 is disposed above the pair of first wall portions 62 of the exhaust member 60. Therefore, the lid portion 651 of the lid member 65 is pressed downward by the top plate portion 17a of the exterior cover 17. This pressing force presses the pair of first wall portions 62 of the lid member 65 against the bottom surfaces of the first grooves 663 and the second grooves 673, so that higher sealing performance can be achieved. Furthermore, when gas is discharged from the gas discharge valve 111 of the energy storage element 11, the lid member 65 may float because the lid member 65 receives the gas. Since the lid member 65 receives a downward pressing force from the exterior cover 17, it is possible to suppress the lid member 65 from floating due to the discharge of gas.

[0109] In addition, a downward pressing force is also applied to the exhaust member 60 from the pair of first wall portions 62 of the cover member 65, so that the exhaust member 60 presses the plurality of energy storage elements 11 downward. This ensures that the seal materials 95 interposed between the exhaust member 60 and the energy storage elements 11 are compressed, achieving higher adhesion. This pressing force also supports the plurality of energy storage elements 11 in the vertical direction.

[0110] [3-2-1 Assembling the cover and exhaust parts] Next, a description will be given of the assembly of the cover member 65 and the exhaust member 60. Here, the first divided body 66, which is a part of the exhaust member 60, and the cover member 65 are illustrated, but the same applies to the second divided body 67.

[0111] Fig. 13 is a cross-sectional view showing a state in the middle of assembling cover member 65 and exhaust member 60 according to embodiment 1. Specifically, Fig. 13(a) shows a case where cover member 65 is placed in a correct position, and Fig. 13(b) shows a case where cover member 65 is placed in an incorrect position.

[0112] 13(a), when the cover member 65 is disposed in the correct position during assembly, each second wall portion 652 of the cover member 65 is inserted between a pair of first divided wall portions 662 and does not interfere with each first interference portion 668. In other words, the insertion is not impeded, and the cover member 65 is smoothly disposed in the correct position and assembled to the first divided body 66 (see FIG. 10).

[0113] On the other hand, as shown in FIG. 13(b), when the lid member 65 is lowered while being shifted from the correct position in the X-axis direction during assembly, one of the second wall portions 652 interferes with one of the first interference portions 668 from a direction (Z-axis direction) intersecting the protruding direction (X-axis direction) of the first interference portion 668. When the lid member 65 is shifted in the opposite direction to FIG. 13(b), the other second wall portion 652 interferes with the other first interference portion 668. In other words, when the lid member 65 is to be placed in an incorrect position during assembly, the first interference portion 668 interferes with the second wall portion 652 and prevents the insertion. As a result, the lid member 65 floats significantly from the correct position (see the dashed line portion in FIG. 13(b)). In this state, the worker can immediately recognize the incorrect insertion of the lid member 65, and the assembly work can be redone. Even if the worker misses it, the incorrect insertion can be detected because the assembly of the process cannot be performed.

[0114] Particularly in this embodiment, each of the first interference portions 668 is accommodated in each of the first recesses 717 of the bus bar frame 12. In this state, each of the first interference portions 668 is disposed at the boundary (gap) between the first wall portion 62 and the third wall portion 716. That is, even if the cover member 65 is misaligned and the second wall portion 652 attempts to enter the boundary (gap) between the first partition wall portion 662 and the third wall portion 716, the second wall portion 652 abuts against the first interference portion 668 and cannot enter the boundary between the first partition wall portion 662 and the third wall portion 716. Therefore, it is possible to prevent the second wall portion 652 from being erroneously inserted into the boundary between the first partition wall portion 662 and the third wall portion 716.

[0115] The energy storage elements 11 are present below the boundary between the first divided wall portion 662 and the third wall portion 716. Therefore, if the second wall portion 652 of the metal cover member 65 is erroneously inserted into this boundary, it may come into contact with the energy storage elements 11 and cause a short circuit. However, in the present embodiment, the second wall portion 652 is not erroneously inserted into the boundary, so that the occurrence of a short circuit can be suppressed.

[0116] Here, if the lid member 65 is integrated with the exterior body lid 17 from the time of assembly, the exterior body lid 17 covers the lid member 65 during assembly, so the lid member 65 cannot be seen by the worker. For this reason, the lid member 65 is easily misplaced. Assuming that the first interference portion 668 and the second interference portion 678 are not provided, if the second wall portion 652 of the lid member 65 is inserted between the first wall portion 62 and the third wall portion 716 due to misplacement, the above-mentioned floating does not occur. Even if there is a floating, it is difficult to find the floating from the outside because the exterior body lid 17 covers the lid member 65. In this embodiment, as shown in (b) of FIG. 13, the exterior body lid 17 together with the lid member 65 is largely floated from the correct position, so the worker can recognize the erroneous insertion of the lid member 65 at a glance.

[0117] In this embodiment, the presence of the front wall 659 of the cover member 65 and the end wall 677 of the second partition 67 makes it difficult for incorrect insertion to occur. However, even in this case, partial incorrect insertion may occur near the exhaust port 51, for example, when the exterior body cover 17 is assembled at an angle relative to the Y axis.

[0118] [3-3 Sealing material] Next, the sealing material 95 will be described. As shown in FIG. 5, the sealing material 95 is disposed between the energy storage elements 11 and the exhaust member 60, and is a member for maintaining airtightness between the energy storage elements 11 and the exhaust member 60. One sealing material 95 is provided for each energy storage element 11. That is, 16 sealing materials 95 are provided in the energy storage device 1 as a whole (see FIG. 3). All the sealing materials 95 have the same shape, so here, one sealing material 95 will be described.

[0119] Fig. 14 is an explanatory diagram showing a sealing material 95 and its peripheral members according to the first embodiment. Specifically, Fig. 14(a) is a plan view of the sealing material 95, and Fig. 14(b) is a cross-sectional view of the sealing material 95 placed on the energy storage element 11. Fig. 14(b) is a cross-sectional view of a cut surface including line XIVb-XIVb in Fig. 14(a). Fig. 14(a) shows the positional relationship with each part of the first divided body 66, with the first hole portion 664 indicated by a dashed line and the annular protrusion portion 665 indicated by a two-dot chain line.

[0120] As shown in FIG. 14, the sealing material 95 is a plate-like member. Specifically, the sealing material 95 is a plate body having a rectangular shape in a plan view and elongated in the Y-axis direction. The sealing material 95 is placed on the upper wall portion 11d of the container 11a of the energy storage element 11. Here, a restricting recess 112 is formed on the upper surface of the upper wall portion 11d. The restricting recess 112 is a portion recessed below the peripheral portion of the upper wall portion 11d. When the sealing material 95 is placed in the restricting recess 112, both ends of the sealing material 95 in the Y-axis direction come into contact with the inner side surface of the restricting recess 112, and the movement and rotation in the Y-axis direction are restricted. In other words, the restricting recess 112 is a restricting portion that restricts the movement of the sealing material 95. Note that the restricting portion may be of any type as long as it restricts the movement of the sealing material 95. For example, a positive electrode or negative electrode gasket provided on the upper wall portion 11d of the energy storage element 11 may be brought into contact with the sealing material 95 to form the restricting portion. In the case of a gasket, it can be brought into contact with sealing material 95 from the X-axis direction. Also, an insulating sealing material (tube) attached to container 11a of energy storage element 11 may be brought into contact with sealing material 95 to serve as the restricting portion. Furthermore, a dedicated member for restricting sealing material 95 may be provided on upper wall portion 11d and used as the restricting portion.

[0121] Further, a through hole 96 communicating with each hole (first hole 664, second hole 674) of the exhaust member 60 is formed in the center of the sealing material 95. The through hole 96 has a shape based on a circle, and a pair of protruding pieces 97 facing each other in the Y axis direction are formed in the center of the inner periphery in the X axis direction. The pair of protruding pieces 97 protrude toward the center of the through hole 96, and their tip surfaces are convexly curved surfaces. Therefore, the planar shape of the through hole 96 is a shape in which a first width W1 in the Y axis direction (first direction) is different from a second width W2 in the X axis direction (second direction).

[0122] Because a pair of protruding pieces 97 are provided on the inner peripheral edge of through-hole portion 96 in this manner, the width in the Y-axis direction passing through the center of through-hole portion 96 in a plan view varies because the positions of protruding pieces 97 change when sealing material 95 is rotated. In this embodiment, the correct posture of sealing material 95 is one in which the arrangement direction of multiple energy storage elements 11 is parallel to the width direction at first width W1. In other words, when the width of through-hole portion 96 is measured based on the arrangement direction and the measurement result is first width W1, it can be determined that sealing material 95 is arranged in the correct posture.

[0123] For example, assume that the sealing material 95 is out of the correct position, and the arrangement direction of the energy storage elements 11 is parallel to the width direction at the second width W2. In this case, when the width of the through-hole portion 96 is measured based on the arrangement direction, the measurement result is the second width W2, so it can be determined that the sealing material 95 is arranged in an irregular position. In other words, by measuring the width of the through-hole portion 96 in the arrangement direction, it can be determined whether the sealing material 95 is present and whether it is arranged in a correct position. Examples of methods for measuring the width of the through-hole portion 96 include a measurement method using a laser distance meter and a measurement method using an image measuring device.

[0124] Furthermore, the shape of the through-hole portion 96 may be any shape as long as the first width W1 and the second width W2 are different. Other planar shapes of the through-hole portion 96 include a polygonal shape, an elliptical shape, and an oval shape. Furthermore, as long as the first width W1 and the second width W2 are different, the number of the protruding pieces 97 may be one or three or more.

[0125] Moreover, the seal material 95 is more flexible than the exhaust member 60. That is, the seal material 95 has a property of being softer and more easily deformed than the exhaust member 60. Specifically, the seal material 95 may have a lower hardness or a lower Young's modulus than the exhaust member 60. In this embodiment, the seal material 95 is formed of heat-resistant rubber. Since the seal material 95 is more flexible than the exhaust member 60, the tip of the annular convex portion 665 of the exhaust member 60 adheres to the seal material 95 in a state in which the seal material 95 is deformed (see FIG. 5). When in close contact, the annular convex portion 665 continuously surrounds the first hole portion 664 and the through-hole portion 96 over the entire circumference, so that the sealability between the exhaust member 60 and the seal material 95 can be ensured.

[0126] [4. Description of Effects] As described above, in the electricity storage device 1 according to this embodiment, in the adjacent portion of the first division 66 and the second division 67 that form the exhaust section 50, the overlap portion 681 provided at one end of the first division 66 overlaps the other end of the second division 67 in a plan view. This overlap portion 681 can narrow the gap between the adjacent portions of the first division 66 and the second division 67, thereby suppressing gas leakage from the adjacent portions.

[0127] In addition, the gap between the adjacent portions of the first and second partition walls 662 and 672 is covered by the second wall 652 of the cover member 65. In this manner, the overlap portion 681 and the cover member 65 can narrow the gap between the adjacent portions of the first and second partitions 66 and 67, thereby further suppressing gas leakage from the adjacent portions.

[0128] Furthermore, a first flange portion 682 is formed at one end of the first bottom portion 661, and a second flange portion 692 opposing the first flange portion 682 is formed at the other end of the second bottom portion 671, so that the first flange portion 682 and the second flange portion 692 overlap each other, thereby narrowing the gap in the assembly portion.

[0129] Here, it is assumed that the first divided body 66 and the second divided body 67 may be misaligned in the Z-axis direction due to their respective tolerances. In this embodiment, a first flange 682 is formed at one end of the first bottom 661, and a second flange 692 facing the first flange 682 is formed at the other end of the second bottom 671. Therefore, even if the first divided body 66 and the second divided body 67 are misaligned in the Z-axis direction, the opposing relationship between the first flange 682 and the second flange 692 can be maintained, and the gap in the assembled portion can be narrowed. As a result, gas leakage can be suppressed even if the first divided body 66 and the second divided body 67 are misaligned in the Z-axis direction.

[0130] In addition, since the tip end of the overlap portion 681 is disposed with a gap S1 from the other end of the second divided body 67, this gap S1 can absorb positional deviations caused by tolerances. This allows the first divided body 66 and the second divided body 67 to be disposed at accurate positions in the longitudinal direction.

[0131] In addition, first divided body 66 having overlapping portion 681 is disposed on the exhaust port 51 side, and overlapping portion 681 is disposed higher than the other end of second divided body 67, so that overlapping portion 681 can block fire penetrating into energy storage elements 11. In other words, even if gas should ignite, it is possible to prevent normal energy storage elements 11 from catching fire.

[0132] In addition, since the tip of the annular protrusion 665 abuts against the seal material 95 over the entire circumference while surrounding the first hole portion 664 and the through-hole portion 96, the annular protrusion 665 adheres closely to the seal material 95 while the seal material 95 is deformed. This can improve the airtightness between the exhaust member 60 and the seal material 95. Here, since the tip of the annular protrusion 665 provided on the exhaust member 60 presses the highly flexible seal material 95, it can bite into the seal material 95 with a smaller force than when the entire surface of the seal material 95 is pressed. In other words, even if the structure for pressing the seal material 95 is simplified, high airtightness can be maintained.

[0133] In addition, since the cross-sectional shape of the tip of the annular protrusion 665 is tapered, it easily bites into the sealing material 95 when pressed. Therefore, a high level of sealing can be maintained with a smaller force.

[0134] In addition, a protruding piece 97 is provided on the inner peripheral edge of the through-hole portion 96. If the sealant 95 is deviated from the normal position, for example, if the arrangement direction is parallel to the width direction at the second width W2, the width of the through-hole portion 96 based on the arrangement direction (second width W2) is different from the width in the normal position (first width W1). In other words, by measuring the width of the through-hole portion 96 based on the arrangement direction, it is possible to determine whether the sealant 95 is arranged in the normal position. This makes it possible to detect incorrect arrangement of the sealant 95 during manufacturing. If incorrect arrangement of the sealant 95 can be detected, it is possible to suppress a decrease in sealing performance caused by the incorrect arrangement.

[0135] Furthermore, since the energy storage element 11 is provided with the restricting recess 112 (restricting portion) that restricts the position of the sealing material 95, the restricting recess 112 can suppress misalignment of the sealing material 95. Therefore, the misalignment between the sealing material 95 and the annular protrusion 665 is also suppressed, and the sealing performance can be more reliably exhibited.

[0136] Here, for example, when gas is discharged from gas discharge valve 111 of one energy storage element 11, the gas is discharged to exhaust path 59 via through hole portion 96 and first hole portion 664. At this time, if the heated gas from exhaust path 59 reaches other normal energy storage elements 11, it will have an adverse effect on the normal energy storage elements 11, which is undesirable. In this embodiment, since flange portion 669 is provided inside annular convex portion 665, this flange portion 669 acts as a barrier and can suppress the backflow of gas from exhaust path 59 to energy storage elements 11.

[0137] Furthermore, the first divided body 66 constituting the exhaust member 60 is provided with a positioning protrusion 666 that directly contacts the energy storage element 11, so that the relative positions of the exhaust member 60 and the energy storage element 11 are determined only between these two. In other words, no other members are interposed, and the accumulation of tolerances is minimal between only the members. Therefore, it is possible to reduce dimensional variation when assembling the exhaust member 60 and the energy storage element 11, and to suppress misalignment between each of the first holes 664 and each of the gas exhaust valves 111. The same is true for the second divided body 67.

[0138] Furthermore, since the pair of positioning protrusions 666 sandwich the energy storage elements 11 in the arrangement direction of the multiple energy storage elements 11 (Y-axis direction), the positioning of the energy storage elements 11 and the first divided body 66 in the arrangement direction can be reliably carried out. Furthermore, since the first divided body 66 is positioned relative to the energy storage elements 11 at two points, rotation of the first divided body 66 relative to the energy storage elements 11 is also restricted. As a result, it is possible to improve the stability of the alignment of the first divided body 66, which is a part of the exhaust member 60, with the energy storage elements 11. The same is true for the second divided body 67.

[0139] In addition, since the opposing corners 666c of each of the pair of positioning protrusions 666 are chamfered, the corners 666c of the pair of positioning protrusions 666 function as guides that guide the energy storage element 11. This allows the energy storage element 11 to be smoothly inserted between the pair of positioning protrusions 666. The same applies to the second divided body 67.

[0140] Furthermore, since a pair of positioning protrusions 666 are arranged in a direction (X-axis direction) intersecting the arrangement direction of the multiple energy storage elements 11, the first divided body 66 is positioned at two points relative to the energy storage elements 11. This makes it possible to restrict rotation of the first divided body 66 relative to the energy storage elements 11, and further improves the stability of alignment between the first divided body 66, which is a part of the exhaust member, and the energy storage elements 11. The same is true for the second divided body 67.

[0141] Furthermore, since the positioning protrusion 666 is disposed only in the center of the first divided body 66, the positioning protrusion 666 abuts against and positions the centrally disposed energy storage element 11 among the multiple energy storage elements 11. In other words, it is possible to suppress the accumulation of tolerances in the first divided body 66. Therefore, it is possible to more accurately align the first divided body 66, which is a part of the exhaust member 60, and the energy storage element 11. The same is true for the second divided body 67.

[0142] Moreover, the first interference portion 668 does not interfere with the second wall portion 652 when the cover member 65 covers the exhaust path 59 in the correct position. Therefore, the insertion of the cover member 65 into the correct position is not hindered, and the cover member 65 can be smoothly arranged in the correct position. On the other hand, the first interference portion 668 interferes with the second wall portion 652 in a direction intersecting the protruding direction of the first interference portion 668 (Z-axis direction) when the cover member 65 covers the exhaust path 59 in an incorrect position. Therefore, when the second wall portion 652 of the cover member 65 is to be arranged in an incorrect position during assembly, the first interference portion 668 interferes with the second wall portion 652 and hinders the insertion. As a result, the cover member 65 floats more than when it is arranged in the correct position, so that the operator can recognize the incorrect insertion of the cover member 65 at a glance. Therefore, it is possible to prevent the cover member 65 from being installed in an incorrect position.

[0143] Furthermore, since the first divided wall portions 662, which are parts of the pair of first wall portions 62, are each formed with the first interference portions 668, the pair of first interference portions 668 can prevent the lid member 65 from being inserted incorrectly. Therefore, it is possible to more reliably prevent the lid member 65 from being installed in an incorrect position.

[0144] Furthermore, the first interference portions 668 of each of the first divided wall portions 662, which are part of the pair of first wall portions 62, are disposed at positions that are not point-symmetrical with respect to the center G1 of the first divided body 66 in a plan view. For this reason, when a worker rotates the first divided body 66 by 180 degrees during assembly and places it in the bus bar frame 12, the first divided body 66 will be displaced from the correct position with the pair of first interference portions 668 as the starting point. This allows the worker to easily recognize the incorrect placement of the first divided body 66.

[0145] Furthermore, because exterior body lid body 17 covers lid member 65, when lid member 65 is lifted by first interference portion 668, exterior body lid body 17 also lifts. Therefore, by recognizing that exterior body lid body 17 has lifted, the worker can grasp the incorrect placement of lid member 65. In other words, even in an energy storage device 1 having exterior body lid body 17 that covers lid member 65, it is possible to prevent lid member 65 from being incorrectly placed.

[0146] Furthermore, the first interference portion 668 of the first division body 66 and the second interference portion 678 of the second division body 67 have different positional relationships in a plan view. For this reason, if an operator mistakenly accommodates the second interference portion 678 of the second division body 67 in the first recess 717 for the first division body in the bus bar frame 12 during assembly, for example, the second division body 67 will be displaced from the correct position for the first division body. This is also the case when the first interference portion 668 of the first division body 66 is accommodated in the second recess 727 for the second division body. This allows the operator to easily recognize that the first division body 66 and the second division body 67 have been placed in the wrong position.

[0147] Further, the bus bar frame 12 that houses the exhaust member 60 is provided with a pair of third wall portions 716, and a first recess 717 that houses the first interference portion 668 is formed in each of the third wall portions 716. When the first interference portion 668 is housed in the first recess 717, the first interference portion 668 is disposed at the boundary (gap) between the first partition wall portion 662 and the third wall portion 716. That is, even if the cover member 65 is misaligned and the second wall portion 652 attempts to enter the boundary (gap) between the first partition wall portion 662 and the third wall portion 716, the second wall portion 652 abuts against the first interference portion 668, and therefore cannot enter the boundary between the first partition wall portion 662 and the third wall portion 716. Therefore, it is possible to prevent the second wall portion 652 from being erroneously inserted into the boundary between the first partition wall portion 662 and the third wall portion 716.

[0148] (Embodiment 2) In the above-mentioned embodiment 1, a case has been exemplified in which a plurality of sealing materials 95 are provided in a one-to-one correspondence with each energy storage element 11. However, one sealing material may correspond to a plurality of energy storage elements 11. In this embodiment 2, a case has been exemplified in which one sealing material 95A corresponds to eight energy storage elements 11. Note that in the embodiment 2, parts equivalent to those in the above-mentioned embodiment 1 are given the same reference numerals, and description thereof may be omitted.

[0149] Two seal materials 95A of the same type are provided in one electricity storage device 1. One of the two seal materials 95A corresponds to the first division 66, and the other corresponds to the second division 67.

[0150] Fig. 15 is an explanatory diagram showing a schematic configuration of a sealant 95A according to embodiment 2. Specifically, Fig. 15(a) is a plan view of the sealant 95A, and Fig. 15(b) is a side view of the sealant 95A.

[0151] 15, sealing material 95A is formed into a rectangular plate shape that is elongated in the Y-axis direction. Sealing material 95A includes a plurality of sealing portions 951a corresponding to each of energy storage elements 11, and a plurality of joint portions 952a connecting the sealing portions 951a together.

[0152] The seal portion 951a is a portion to be placed on the upper wall portion 11d of each energy storage element 11. The seal portion 951a is formed in a rectangular shape in a plan view that is elongated in the Y-axis direction. The seal portion 951a also has a through-hole portion 96a formed in the center thereof that communicates with each hole portion (first hole portion 664, second hole portion 674) of the exhaust member 60. The through-hole portion 96a has a shape based on a circle, and one protruding piece 97a that protrudes in the Y-axis direction is formed on the inner periphery thereof. Each protruding piece 97a protrudes toward the center of the seal material 95A in the Y-axis direction. The effect of the protruding piece 97a is the same as the effect of the protruding piece 97 in the first embodiment. Note that the protruding direction of each protruding piece 97a is reversed at the center in the Y-axis direction. Each protruding piece 97a on the positive side of the Y axis direction from the center protrudes toward the negative side of the Y axis, and each protruding piece 97a on the negative side of the Y axis direction from the center protrudes toward the positive side of the Y axis. Therefore, even if the seal material 95A is rotated 180 degrees, the position of each protruding piece 97a will be the same as the position before rotation. This prevents misassembly even if the seal material 95A is rotated 180 degrees and placed, and makes the placement work of the seal material easier. In addition, a pair of seal parts 951a located at both ends of the seal material 95A are formed with protrusions 959a that protrude in the X axis direction at the inner periphery of the through hole part 96a. The protrusions 959a are smaller in size than the protruding pieces 97a. In one of the pair of seal parts 951a, a protrusion 959a is provided at the end of the through hole part 96a in the negative direction of the X axis, and in the other seal part 951a, a protrusion 959a is provided at the end of the through hole part 96a in the positive direction of the X axis. In this way, the pair of protrusions 959a are arranged in a positional relationship different from each other in a plan view. When the sealing material 95A is properly arranged on the plurality of energy storage elements 11, the pair of protrusions 959a are in the positional relationship described above. Conversely, when the sealing material 95A is arranged upside down on the plurality of energy storage elements 11, the protrusion 959a of one sealing portion 951a is arranged at the end of the through-hole portion 96a in the positive direction of the X-axis, and the protrusion 959a of the other sealing portion 951a is arranged at the end of the through-hole portion 96a in the negative direction of the X-axis. That is, the positional relationship of the pair of protrusions 959a is different from the normal case.Therefore, it can be easily determined whether the sealing material 95A is properly arranged or not by a measuring method using an image measurement or by visual inspection.

[0153] The joint portion 952a is disposed between adjacent seal portions 951a and connects these seal portions 951a. A step portion 953a extending along the X-axis direction is formed on the lower surface of the joint portion 952a. That is, when viewed from the lower surface side, the joint portion 952a is formed such that a region between adjacent seal portions 951 is recessed in a step shape with respect to the lower surface of the seal portion 951. As a result, the thickness of the joint portion 952a is thinner than the thickness of the seal portion 951a. Therefore, the joint portion 952a is more easily bent than the seal portion 951a. In addition, the length of the joint portion 952a in the Y-axis direction is set to be longer than the interval between adjacent energy storage elements 11. Therefore, after assembly, the joint portion 952a is bent into an arch shape. The stepped shape and length of the joint portion 952a can avoid the peripheral wall that forms the restricting recess 112 in the energy storage element 11 and absorb the variation in the spacing between the energy storage elements 11. This allows each seal portion 951a to be installed on each energy storage element 11 with good workability.

[0154] Further, the step portion 953a accommodates the step formed by the restriction recesses 112 (see FIG. 14) of the adjacent energy storage elements 11. In other words, by arranging the seal material 95A so that each joint portion 952a overcomes each step, it is possible to prevent each seal portion 951a from being lifted from the energy storage elements 11 due to the step, and it is possible to stabilize the airtightness.

[0155] Both ends of each joint portion 952a in the X-axis direction are cut out to avoid interference with other members. Here, among the multiple joint portions 952a, three (three pairs) of joint portions 952a in the center in the Y-axis direction are cut out to have a longer length in the X-axis direction than the other joint portions 952a. This is to accommodate the positioning protrusions 666, 676 of the exhaust member 60. The reason for providing three pairs is that one seal material 95A can be used to assemble both the first divided body 66 and the second divided body 67. These three pairs of cutouts are referred to as assembly cutouts 954a.

[0156] 16 is a bottom view showing a state in which the sealing material 95A according to the second embodiment is assembled to the first division body 66 and the second division body 67. As shown in FIG. 16, in the sealing material 95A assembled to the first division body 66, the positioning projections 666 of the first division body 66 are accommodated in two pairs of assembly notches 954a in the negative direction of the Y axis among the three pairs of assembly notches 954a. In addition, in the sealing material 95A assembled to the second division body 67, the positioning projections 676 of the second division body 67 are accommodated in two pairs of assembly notches 954a in the positive direction of the Y axis among the three pairs of assembly notches 954a. In this way, one sealing material 95A is shared by the first division body 66 and the second division body 67.

[0157] In addition, taking the above description into consideration, sealing material 95A has a rotationally symmetric shape when viewed from above in the Z-axis direction, and can be placed without considering the direction of rotation (180 degrees). Protrusions 959a can easily determine whether the placement is correct or not. In this way, assembly of power storage device 1 is easy.

[0158] As described above, according to this embodiment, the adjacent seal portions 951a are connected by the joint portion 952a, and therefore the multiple seal portions 951a are integrated by the joint portion 952a. Therefore, compared to the case where one seal material is provided for one through hole portion 96a, the installation man-hours can be reduced. In addition, a joint portion 952a that is thinner than the seal portion 951a is provided between the adjacent seal portions 951. Here, although positional deviations may occur between the holes of the exhaust member 60 and the through hole portions 96a of the seal material 95A due to dimensional variations of each member, the positional deviations can be absorbed by the thinned joint portion 952a. Therefore, the deterioration of the sealing property caused by the positional deviations can be suppressed. In addition, the number of connections by which adjacent seal portions 951a are connected by the joint portion 952a may be any number.

[0159] (Embodiment 3) In the above-mentioned embodiment 1, an example was given of a case where the annular protrusions 665 and 675 are provided on the exhaust member 60. In this embodiment 3, an example is given of a case where the annular protrusions are provided on the sealing material. In the embodiment 3, the same parts as those in the above-mentioned embodiment 1 are given the same reference numerals, and the description thereof may be omitted.

[0160] 17 is a cross-sectional view showing a seal material 95B and its surrounding members according to embodiment 3. Specifically, FIG. 17 is a view corresponding to FIG.

[0161] As shown in Fig. 17, the outer bottom surface of the first bottom portion 661b of the first divided body 66b is formed to be flat. Meanwhile, an annular protrusion 955b protruding toward the first divided body 66b is formed on the upper surface of the sealing material 95B. The annular protrusion 955b has a tip end that abuts against the outer bottom surface of the first bottom portion 661b while surrounding the first hole portion 664 and the through-hole portion 96. When abutting, the annular protrusion 955b is compressed in the Z-axis direction, but when no load is applied, the length in the Z-axis direction is longer than that in the state shown in Fig. 17.

[0162] In this way, the annular protrusion 955b abuts against the first divided body 66b over the entire circumference with its tip surrounding the first hole 664 and the through hole 96, so that the annular protrusion 955b itself is in a deformed state and adheres closely to the first divided body 66b. This can improve the sealing performance between the first divided body 66b and the seal material 95B. Here, the tip of the annular protrusion 955b of the seal material 95B is compressed by abutting against the first divided body 66b, so that the contact area can be made smaller than when the entire seal material is compressed, and as a result, the annular protrusion 955b can be deformed with a small force. In other words, even if the structure for pressing the seal material 95B is simplified, high sealing performance can be maintained.

[0163] (Embodiment 4) In the fourth embodiment, other arrangement examples of the first interference part will be described. Here, the first interference part will be described as an example, but the second interference part is similar. In the fourth embodiment, the same parts as those in the first embodiment will be given the same reference numerals, and the description thereof may be omitted.

[0164] Fig. 18 is a schematic diagram showing an example of the arrangement of the first interference portion according to embodiment 4. Specifically, Fig. 18(a) shows modified example 1 according to embodiment 4, Fig. 18(b) shows modified example 2 according to embodiment 4, Fig. 18(c) shows modified example 3 according to embodiment 4, and Fig. 18(d) shows modified example 4 according to embodiment 4.

[0165] In the above-mentioned embodiment 1, the first interference portion 668 is provided at the upper end of the first divided wall portion 662 of the first divided body 66. However, the first interference portion may be provided at any position within the first divided wall portion 662c as long as it blocks the movement of the lid member 65 that is placed in an irregular position. For example, in the first modification, as shown in FIG. 18(a), the first interference portion 668c is provided at the lower end of the first divided wall portion 662c of the first divided body 66c. When the lid member 65 is placed in a regular position, the lid member 65 is accommodated between the pair of first divided wall portions 662c without interfering with the first interference portion 668c (solid line portion in FIG. 18(a)). On the other hand, when the lid member 65 is placed in an irregular position, the second wall portion 652 of the lid member 65 interferes with the first interference portion 668c in the Z-axis direction, so that the lid member 65 is prevented from moving further, and the lid member 65 is lifted (broken line portion in FIG. 18(a)). As a result, the cover member 65 floats higher than when it is placed in the correct position, allowing an operator to immediately recognize that the cover member 65 has been inserted incorrectly.

[0166] In the above-mentioned embodiment 1, the pair of second walls 652 of the cover member 65 are disposed inside the pair of first partition walls 662 of the first divided body 66. However, the pair of second walls 652d may be disposed outside the pair of first partition walls 662. For example, in the second modification, the pair of second walls 652d of the cover member 65d are disposed outside the pair of first partition walls 662 of the first divided body 66 as a normal position (solid line portion in (b) of FIG. 18). In this state, the pair of second walls 652d do not interfere with the first interference portion 668. On the other hand, if the cover member 65d is disposed in an abnormal position, the second walls 652d of the cover member 65d interfere with the first interference portion 668 in the Z-axis direction, so that the cover member 65d is prevented from moving further, and the cover member 65d is lifted (broken line portion in (b) of FIG. 18). As a result, the cover member 65d floats higher than when placed in the correct position, allowing an operator to immediately recognize that the cover member 65d has been inserted incorrectly.

[0167] In the above-mentioned embodiment 1, the first interference portion 668 is provided on the first divided wall portion 662 of the first divided body 66. However, the first interference portion may be provided on any object as long as it blocks the movement of the cover member 65 placed in an irregular position. For example, in the modified example 3, as shown in FIG. 18(c), the first interference portion 668e is provided on a pair of second walls 652e of the cover member 65e. Specifically, the first interference portion 668e is the outer surface of the pair of second walls 652e and protrudes outward from the lower end portion. On the other hand, the first interference portion is not provided on the first divided wall portion 662e of the first divided body 66e.

[0168] When the lid member 65e is placed in the correct position, it is contained between the pair of first divided wall portions 662e (solid line portion in FIG. 18(c)). In this state, the pair of first divided wall portions 662e do not interfere with the first interference portion 668e. On the other hand, when the lid member 65e is placed in an incorrect position, the first interference portion 668e of the lid member 65e interferes with the first divided wall portion 662e in the Z-axis direction. This prevents the lid member 65e from moving any further, causing the lid member 65e to float (broken line portion in FIG. 18(c)). As a result, the lid member 65e floats more than when placed in the correct position, allowing the operator to recognize at a glance that the lid member 65e has been erroneously inserted.

[0169] In the above-mentioned first embodiment, the case where the first interference portion 668 is provided in the exhaust path 59 has been exemplified. However, the first interference portion may be provided near the exhaust path as long as it blocks the movement of a cover member that is placed in an irregular position. For example, in the fourth modification, as shown in FIG. 18(d), the first interference portion 668f is provided in the bus bar frame 12f. Specifically, each first interference portion 668f protrudes from an upper end portion of each third wall portion 716f of the bus bar frame 12f toward the exhaust path 59. In the fourth modification, the first division body 66f is not provided with a first interference portion.

[0170] When the lid member 65 is placed in the correct position, it is contained between the pair of first divided wall portions 662f (solid line portion in FIG. 18(d)). In this state, the pair of first divided wall portions 662f do not interfere with the first interference portion 668f. On the other hand, when the lid member 65 is placed in an incorrect position, the second wall portion 652 of the lid member 65 interferes with the first interference portion 668f in the Z-axis direction. This prevents the lid member 65 from moving any further, causing the lid member 65 to float (broken line portion in FIG. 18(d)). As a result, the lid member 65 floats more than when placed in the correct position, allowing the operator to recognize at a glance that the lid member 65 has been erroneously inserted.

[0171] (others) Although the energy storage device 1 according to each embodiment has been described above, the present invention is not limited to each embodiment. In other words, each embodiment disclosed herein should be considered as illustrative and not restrictive in all respects. The scope of the present invention is indicated by the claims rather than the above description, and is intended to include all modifications within the meaning and scope of the claims.

[0172] For example, in the first embodiment, the exhaust member 60 and the bus bar frame 12 are separate members. However, the bus bar frame and the exhaust member may be integrally molded. In this case, the bus bar frame can be called the exhaust member. The bus bar frame may be divided according to the type of the exhaust member.

[0173] In addition, although the first embodiment illustrates a case in which the exhaust member 60 is divided into two pieces, the number of pieces may be three or more. In this case, two adjacent divided bodies correspond to the first divided body and the second divided body.

[0174] Also, the end wall 677 of the second divided body 67 or the front wall 659 of the cover member 65 may be omitted. Also, the front wall may be formed by bending one end of the cover, and there may be a gap between the front wall and the second wall. In these cases, there is a possibility that incorrect insertion may occur, and an interference portion is effective in preventing incorrect insertion.

[0175] In addition, in the first embodiment, the case where the first divided body 66 is provided with four positioning protrusions 666 that abut against one energy storage element 11 has been exemplified, but the number of positioning protrusions that abut against one energy storage element 11 may be other than four. In addition, the multiple positioning protrusions may be provided so as to abut against fewer than all of the energy storage elements 11 corresponding to the first divided body 66.

[0176] In addition, in the first embodiment, exhaust section 50 includes exhaust member 60, lid member 65, and sealant 95, but depending on the performance of energy storage elements 11, the usage environment of energy storage device 1, and the tolerance for gas discharge, it may not include lid member 65 or sealant 95. Furthermore, exhaust member 60 and lid member 65 may be formed integrally.

[0177] The configuration disclosed in this specification is suitable for an energy storage device 1 that uses energy storage elements 11 with high energy density as in the embodiment.

[0178] Furthermore, configurations constructed by arbitrarily combining the respective components of the above-described embodiment and its modified examples are also included within the scope of the present invention. [Industrial Applicability]

[0179] The present invention can be applied to an electricity storage device including an electricity storage element such as a lithium ion secondary battery. [Explanation of symbols]

[0180] 1. Energy storage device 10 Energy storage unit 11 Energy storage element 11a Container 11b Positive terminal 11c negative terminal 11d Upper wall section 11e Spacer 12, 12f Busbar frame 13 Busbar 13a Detection line 13b Connector 14 Exterior body 15 Exterior body support 15a bottom 15b, 15c, 17b, 17c Connections 15d Fixed part 16 Board unit mounting section 17 Exterior body cover 17a Top plate 18 Exterior body 20 Circuit Board Unit 21, 22 Cable guide 23 Communication cable connector 30 Cable 31 Positive power cable 32 Negative power cable 50 Exhaust section 51 Exhaust port 59 Exhaust route 60 Exhaust parts 61 Bottom 62 First wall 65, 65d, 65e Cover member 66, 66b, 66c, 66e first division body 67 Second split body 68 First engaging part 69 Second engaging part 71 First holding part 72 Second holding part 73 Connecting part 95, 95A, 95B sealing material 96, 96a Through hole portion 97, 97a protruding piece 111 Gas exhaust valve 112 Regulating recess 141 Notch 142 Partition wall 143 Side opening 171 Opening 651 Lid 652, 652d, 652e Second wall section 659 Front wall 661, 661b First bottom 662, 662c, 662e, 662f First dividing wall 663 First groove 664 First hole (hole) 665, 675, 955b Circular convex part 666, 676 Positioning protrusion 666a First positioning protrusion 666b Second positioning protrusion 666c, 666d Corner 668, 668c, 668e, 668f First interference part (interference part) 669 Flange 671 Second bottom 672 Second dividing wall part 673 Second groove 674 Second hole (hole) 677 End wall 678 Second interference part (interference part) 681 Overlapped section 682 First Guard 691 Storage recess 692 Second Guard 711 First outer wall 711a, 711b, all missing 715 First cable route section 716, 716f Third wall 717 First Recess 721 Second outer wall section 721a Second notch 725 Second Cable Route Section 727 Second Recess 731 Beam section 951a Seal part 952a Joint 953a Step 954a Assembly notch 959a protrusion G1 center G2 center L1 first distance L10 distance L2 second distance S1 interval S2 interval W1 First width W2 Second width

Claims

1. A plurality of electric storage elements each having a gas exhaust valve, the gas exhaust valves being arranged in such a manner that they face in the same direction; an exhaust section that is disposed above the plurality of electric storage elements and forms an exhaust path for the gas exhausted from the gas exhaust valve; the exhaust section has a plurality of holes communicating with the gas exhaust valves of the plurality of electric storage elements, the exhaust section is divided in an arrangement direction of the plurality of electric storage elements and includes a first division body and a second division body adjacent to the first division body, At least one of the first division body and the second division body has two or more holes among the plurality of holes, an overlap portion protruding toward the second division body at one end of the first division body and overlapping with the other end of the second division body in a plan view; the exhaust section forms an exhaust path together with the first divided body and the second divided body and includes a cover member that covers an upper portion of the exhaust path, The first partition has a first bottom having the overlap portion, and a pair of first partition walls extending from both ends of the first bottom, The second division body has a second bottom portion adjacent to the first bottom portion and second division wall portions standing on both end portions of the second bottom portion, The cover member has a cover portion that covers the first divided body and the second divided body, and a pair of second wall portions that stand upright from both ends of the cover portion and overlap the first divided wall portion and the second divided wall portion. Energy storage device.

2. a first flange portion is formed at one end of the first bottom portion and protrudes toward the energy storage element; A second flange portion is formed at the other end of the second bottom portion, the second flange portion protruding toward the energy storage element and facing the first flange portion. The power storage device according to claim 1 .

3. A plurality of storage elements each having a gas exhaust valve and arranged with the gas exhaust valves facing the same direction; an exhaust section that is disposed above the plurality of electric storage elements and forms an exhaust path for the gas exhausted from the gas exhaust valve; the exhaust section has a plurality of holes communicating with the gas exhaust valves of the plurality of electric storage elements, the exhaust section is divided in an arrangement direction of the plurality of electric storage elements and includes a first division body and a second division body adjacent to the first division body, At least one of the first division body and the second division body has two or more holes among the plurality of holes, an overlap portion protruding toward the second division body at one end of the first division body and overlapping with the other end of the second division body in a plan view; The tip end of the overlap portion is spaced apart from the other end of the second division body. Energy storage device.

4. A plurality of storage elements each having a gas exhaust valve and arranged with the gas exhaust valves facing the same direction; an exhaust section that is disposed above the plurality of electric storage elements and forms an exhaust path for the gas exhausted from the gas exhaust valve; the exhaust section has a plurality of holes communicating with the gas exhaust valves of the plurality of electric storage elements, the exhaust section is divided in an arrangement direction of the plurality of electric storage elements and includes a first division body and a second division body adjacent to the first division body, At least one of the first division body and the second division body has two or more holes among the plurality of holes, an overlap portion protruding toward the second division body at one end of the first division body and overlapping with the other end of the second division body in a plan view; the first division body is disposed closer to an exhaust port in the exhaust path than the second division body, The overlap portion is disposed above the other end of the second division body. Energy storage device.

5. A plurality of storage elements each having a gas exhaust valve and arranged with the gas exhaust valves facing the same direction; an exhaust section that is disposed above the plurality of electric storage elements and forms an exhaust path for the gas exhausted from the gas exhaust valve; the exhaust section has a plurality of holes communicating with the gas exhaust valves of the plurality of electric storage elements, the exhaust section is divided in an arrangement direction of the plurality of electric storage elements and includes a first division body and a second division body adjacent to the first division body, At least one of the first division body and the second division body has two or more holes among the plurality of holes, an overlap portion protruding toward the second division body at one end of the first division body and overlapping with the other end of the second division body in a plan view; The overlap portion has a flat plate shape and is exposed to the exhaust path. Energy storage device.

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