Electric storage device

Abstract

This power storage device (1) is provided with: a plurality of power storage elements (11) which respectively have gas discharge valves (111), and which are arranged so that the gas discharge valves (111) face in the same direction; and an exhaust member (60) which is arranged on the plurality of power storage elements (11) so as to form an exhaust path (69) for the gas discharged from the gas discharge valves (111). The exhaust member (60) has a plurality of first hole parts (664) and second hole parts (674), which are in communication with the respective gas discharge valves (111) of the plurality of power storage elements (11). The exhaust member (60) has positioning projections (666, 676), each of which protrudes toward one power storage element (11) among the plurality of power storage elements (11) from a position in a direction, in which the plurality of power storage elements (11) are arranged, in such a manner that the positioning projection is in contact with the power storage element (11).

Description

Technical Field

[0001] The present invention relates to a power storage device.

Background Art

[0002] Conventionally, an exhaust member (upper plate) has been attached to a plurality of power storage elements (secondary batteries) arranged in a predetermined direction in a power storage device (see Patent Document 1). The exhaust member is a member that forms a flow path for the gas discharged from the gas discharge valve (vent) of each power storage element, and gas or electrolyte is discharged from the tip thereof. A plurality of holes (openings) are formed in the exhaust member for introducing the gas or electrolyte discharged from the gas discharge valve of each power storage element into the exhaust member.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Each member constituting the power storage device has its own tolerance. Therefore, when assembling each member, the tolerances are stacked between the members, and the tolerance at the assembly portion increases. When the tolerance increases, there is a risk of misalignment between each hole of the exhaust member and the gas discharge valve of each power storage element.

[0005] An object of the present invention is to provide a power storage device capable of suppressing misalignment between each hole of an exhaust member and the gas discharge valve of each power storage element.

Means for Solving the Problems

[0006] The power storage device according to one aspect of the present invention includes a plurality of power storage elements each having a gas discharge valve, the gas discharge valves being arranged in a posture facing the same direction, and an exhaust member disposed on the plurality of power storage elements to form an exhaust path for the gas discharged from the gas discharge valves. The exhaust member has a plurality of holes communicating with the gas discharge valves of the plurality of power storage elements, and the exhaust member protrudes from any position in the arrangement direction of the plurality of power storage elements toward any one of the plurality of power storage elements and has a positioning protrusion that abuts against the power storage element.

Advantages of the Invention

[0007] According to the power storage device of the present invention, displacement between each hole of the exhaust member and the gas discharge valve of each power storage element can be suppressed.

Brief Description of the Drawings

[0008]

Figure 1A

Figure 1B

Figure 1C

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Embodiments for Carrying Out the Invention

[0009] Each member forming the power storage device has its own tolerance. Therefore, when assembling each member, the tolerances are stacked between the members, and the tolerance at the assembly portion increases. When the tolerance increases, there is a risk of misalignment between each hole portion of the exhaust member and the gas discharge valve of each power storage element.

[0010] An object of the present invention is to provide a power storage device capable of suppressing misalignment between each hole of an exhaust member and a gas discharge valve of each power storage element.

[0011] To achieve the above object, a power storage device according to an aspect of the present invention includes a plurality of power storage elements each having a gas discharge valve and arranged in a posture in which the gas discharge valves face the same direction, and a plurality of power storage elements arranged on the plurality of power storage elements. An exhaust member that forms an exhaust path for the gas discharged from the gas discharge valve, the exhaust member has a plurality of holes communicating with the gas discharge valves of the plurality of power storage elements, and the exhaust member protrudes from any position in the arrangement direction of the plurality of power storage elements toward any one of the plurality of power storage elements, and has a positioning protrusion that abuts against the power storage element.

[0012] According to this, since the exhaust member is provided with a positioning protrusion that directly abuts against the power storage element, the relative position between the exhaust member and the power storage element is determined only between these two members. That is, no other members are interposed, and the accumulation of tolerances is only between the minimum members. Therefore, dimensional variations during assembly of the exhaust member and the power storage element can be reduced, and misalignment between each hole and each gas discharge valve can be suppressed.

[0013] A pair of positioning protrusions may be provided at positions sandwiching the power storage element in the arrangement direction of the plurality of power storage elements.

[0014] According to this, since the pair of positioning protrusions sandwich the power storage element in the arrangement direction, misalignment between the power storage element and the exhaust member in the arrangement direction can be reliably suppressed. Since the exhaust member is positioned at two locations with respect to the power storage element, rotation of the exhaust member with respect to the power storage element is also restricted. From these, the stability of alignment between the exhaust member and the power storage element can be enhanced.

[0015] Each of the pair of positioning protrusions may have chamfered corner portions facing each other.

[0016] According to this, since the corners of each of the pair of positioning protrusions are chamfered so as to face each other, the corners of the pair of positioning protrusions function as guide portions for guiding the power storage element. Thereby, the power storage element can be smoothly inserted between the pair of positioning protrusions.

[0017] The positioning protrusions may be arranged in a pair in a direction intersecting the arrangement direction of the plurality of power storage elements.

[0018] According to this, since the pair of positioning protrusions are arranged in a direction intersecting the arrangement direction, the exhaust member is positioned at two locations with respect to the power storage element. Thereby, rotation of the exhaust member with respect to the power storage element can be restricted, and the stability of the alignment between the exhaust member and the power storage element can be further enhanced.

[0019] The positioning protrusion may be arranged at the central portion of the exhaust member in the arrangement direction of the plurality of power storage elements.

[0020] When the power storage element arranged at one end among the plurality of power storage elements and the exhaust member are aligned (Case 1), the tolerance of the exhaust member accumulates toward the other end side. For this reason, the positional deviation becomes large between the power storage element arranged at the other end and the exhaust member. On the other hand, if the positioning protrusion is arranged at the central portion of the exhaust member as in this embodiment, the positioning protrusion abuts against and is positioned with respect to the power storage element arranged at the center among the plurality of power storage elements. That is, even compared with Case 1, accumulation of tolerance in the exhaust member can be suppressed. Therefore, the exhaust member and the power storage element can be more accurately aligned.

[0021] Hereinafter, with reference to the drawings, a power storage device according to an embodiment (including a modified example thereof) of the present invention will be described. Each of the embodiments described below shows comprehensive or specific examples. The numerical values, shapes, materials, components, arrangement positions of the components, connection forms, etc. shown in the following embodiments are examples, and are not intended to limit the present invention. In each drawing, dimensions and the like are not strictly illustrated.

[0022] In the following description and drawings, the longitudinal direction of the power storage device, the arrangement direction of a pair (positive electrode side and negative electrode side) of electrode terminals in one power storage element, and the opposing direction of the short side surfaces of the container of the power storage element are defined as the X-axis direction. The width direction of the power storage device, the arrangement direction of a plurality of power storage elements, and the opposing direction of the long side surfaces of the container of the power storage element are defined as the Y-axis direction. The height direction of the power storage device, the arrangement direction of the exterior body support and the exterior body lid of the power storage unit, the arrangement direction of the power storage element and the bus bar, the arrangement direction of the container main body and the lid portion of the power storage element, or the vertical direction is defined as the Z-axis direction. These X-axis direction, Y-axis direction, and Z-axis direction are directions that intersect (orthogonal in this embodiment) with each other. Depending on the usage mode, there may be a case where the Z-axis direction does not become the vertical direction, but hereinafter, for convenience of explanation, the Z-axis direction will be described as the vertical direction.

[0023] In the following description, the X-axis plus direction indicates the arrow direction of the X-axis, and the X-axis minus direction indicates the direction opposite to the X-axis plus direction. The same applies to the Y-axis direction and the Z-axis direction. In this embodiment, it is assumed that the Y-axis plus direction is the rear and the Y-axis minus direction is the front. Hereinafter, the Y-axis direction may also be referred to as the first direction, and the X-axis direction may also be referred to as the second direction. Expressions indicating relative directions or postures such as parallel and orthogonal include cases where they are not strictly in that direction or posture. That two directions are orthogonal means not only that the two directions are completely orthogonal, but also that they are substantially orthogonal, that is, including a difference of about several percent.

[0024] (Embodiment 1) [1 Power storage device] The configuration of the power storage device 1 in this embodiment will be described. FIG. 1A is a perspective view showing the appearance of the power storage device 1 according to Embodiment 1. FIG. 1B is a side view showing the appearance of the power storage device according to Embodiment 1. (a) of FIG. 1B shows an overall side view of the power storage device, and (b) of FIG. 1B is a side view showing an enlarged portion surrounded by a broken line in (a) of FIG. 1B. FIG. 1C is a front view showing the appearance of the power storage device according to Embodiment 1. FIG. 2 is an exploded perspective view showing each component when the power storage unit 10 according to Embodiment 1 is disassembled.

[0025] The power storage device 1 is a device that can charge electricity from the outside and discharge electricity to the outside. In the present embodiment, it has a substantially rectangular parallelepiped shape. The power storage device 1 is used for power storage applications, power supply applications, etc. Specifically, the power storage device 1 is used as a stationary battery or the like for household or industrial power storage facilities. The power storage device 1 can be used as a battery for driving a moving body such as an automobile, a motorcycle, a watercraft, a ship, a snowmobile, an agricultural machine, a construction machine, or a railway vehicle for electric railways, or for engine starting. 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 vehicle. Examples of the above-mentioned railway vehicle for electric railways include a train, a monorail, and a linear motor car.

[0026] As shown in FIGS. 1A, 1B, 1C, and 2, the power storage device 1 includes a power storage unit 10 and a substrate unit 20 attached to the power storage unit 10. The power storage unit 10 is a battery module (battery pack) having a substantially rectangular parallelepiped shape that is long in the Y-axis direction. Specifically, the power storage unit 10 includes a plurality of power storage elements 11, a bus bar frame 12, an exhaust portion 50, a plurality of bus bars 13, and an exterior body 18 including an exterior body main body 14, an exterior body support 15, and an exterior body lid 17 that houses these. The power storage unit 10 includes a cable 30, a detection line 13a, etc. The power storage unit 10 may have a restraining member (end plate, side plate, etc.) that restrains a plurality of power storage elements 11.

[0027] The energy storage element 11 is a secondary battery (single cell) that can charge and discharge electricity. More specifically, it is a non-aqueous electrolyte secondary battery such as a lithium-ion secondary battery. The energy storage element 11 contains a three-component cathode active material mainly composed of Li, Ni, Co, and Mn in the cathode, and graphite as an active material in the anode. The cathode active material may be an LiMn2O4-based, LiFePO4, LiCO2, LiNiO2-based, etc., and is not particularly limited. The anode active material may be a carbon-based material (soft carbon, hard carbon, etc.), Si and its oxides (SiO, etc.), an alloy-based anode such as tin, etc., and is not particularly limited. The energy density of the energy storage element 11 is 120 Wh / kg or more. The energy storage element 11 has a flat rectangular parallelepiped shape (rectangular shape). In this embodiment, 16 energy storage elements 11 are arranged side by side in the Y-axis direction. The shape, arrangement position, number, etc. of the energy storage element 11 are not particularly limited. The energy storage element 11 is not limited to a non-aqueous electrolyte secondary battery, and may be a secondary battery other than a non-aqueous electrolyte secondary battery, or may be a capacitor. The energy storage element 11 may be a primary battery in which the electricity stored can be used without the user having to charge it, rather than a secondary battery. The energy storage element 11 may be a battery using a solid electrolyte. The energy storage element 11 may be a laminated energy storage element.

[0028] Specifically, the energy storage element 11 includes a metal container 11a. On the upper wall portion 11d of the container 11a, a positive electrode terminal 11b and a negative electrode terminal 11c, which are metal electrode terminals, are provided. That is, the positive electrode terminal 11b and the negative electrode terminal 11c are provided on the upper surface of the main body portion. On the upper wall portion 11d of the container 11a, a gas discharge valve 111 (see FIG. 5 etc.) that discharges 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. The energy storage element 11 has a flat rectangular parallelepiped shape with a thickness (dimension in the Y-axis direction) smaller than the width (dimension in the X-axis direction). In a top view (view in the Z-axis direction), the upper wall portion 11d has a rectangular shape. The energy storage element 11 includes a long side surface parallel to the XZ plane and a short side surface parallel to the YZ plane, and a plurality of energy storage elements 11 are arranged such that their long side surfaces face each other. The plurality of energy storage elements 11 are arranged in a posture where their respective gas discharge valves 111 face the same direction (Z-axis positive direction). A flat plate-shaped spacer 11e having heat insulation properties is disposed between adjacent energy storage elements 11. The upper wall portion 11d of the container 11a may be provided with a liquid injection portion or the like for injecting an electrolytic solution. Inside the container 11a, an electrode body (also referred to as an energy storage element or a power generation element) and a current collector (a positive electrode current collector and a negative electrode current collector), etc. are arranged, and an electrolytic solution (non-aqueous electrolyte) and the like are enclosed, but detailed description is omitted.

[0029] The positive electrode terminal 11b and the negative electrode terminal 11c project upward (Z-axis positive direction) from the upper wall portion 11d of the container 11a. By connecting the outermost positive electrode terminal 11b and negative electrode terminal 11c of the plurality of energy storage elements 11 to the cable 30, the energy storage device 1 can charge with electricity from the outside and discharge electricity to the outside.

[0030] The cable 30 is an electric wire (also referred to as a power cable, power line, power supply line, main circuit cable) through which a current (also referred to as a charge-discharge current or main current) for charging and discharging the power storage device 1 (power storage element 11) flows, and it has a positive electrode power cable 31 on the positive electrode side and a negative electrode power cable 32 on the negative electrode side. That is, the positive electrode power cable 31 of the cable 30 is connected to the positive electrode terminal 11b of the power storage element 11 at the end in the +Y-axis direction among the plurality of power storage elements 11, and the negative electrode power cable 32 of the cable 30 is connected to the negative electrode terminal 11c of the power storage element 11 at the end in the -Y-axis direction.

[0031] The bus bar frame 12 is a flat rectangular member capable of electrically insulating the bus bar 13 from other members and restricting the position of the bus bar 13. The bus bar frame 12 is formed of an insulating member such as polycarbonate (PC), polypropylene (PP), or polyethylene (PE). Specifically, the bus bar frame 12 is placed above the plurality of power storage elements 11 and positioned with respect to the plurality of power storage elements 11. A plurality of bus bars 13 are placed and positioned on the bus bar frame 12. Thereby, each bus bar 13 is positioned with respect to the plurality of power storage elements 11 and joined to the positive electrode terminals 11b and negative electrode terminals 11c of the plurality of power storage elements 11. Details of the bus bar frame 12 will be described later.

[0032] The exhaust portion 50 is arranged on the bus bar frame 12 and constitutes an exhaust path 59 (see FIG. 5 etc.) for the gas discharged from the gas discharge valve 111 of each power storage element 11. One end portion in the +Y-axis direction of the exhaust portion 50 is an exhaust port 51 from which the gas is discharged, and it protrudes from one end portion in the +Y-axis direction of the exterior body 18.

[0033] Each bus bar 13 is a rectangular plate-shaped member that is disposed on a plurality of power storage elements 11 (on the bus bar frame 12) and electrically connects the electrode terminals of the plurality of power storage elements 11. The bus bar 13 is formed of a metal such as aluminum, an aluminum alloy, copper, a copper alloy, or a nickel material. In the present embodiment, the bus bar 13 connects the positive electrode terminals 11b and the negative electrode terminals 11c of adjacent power storage elements 11 to connect the 16 power 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 X-axis positive direction side (one side) and a second bus bar group arranged along the Y-axis direction on the X-axis negative direction side (the other side). The connection mode of the power storage elements 11 is not limited to the above, and any combination of series connection and parallel connection may be used.

[0034] A detection line 13a is connected to the bus bar 13 or the electrode terminal of the power storage element 11. Illustration of these connection structures is omitted. The detection line 13a is a cable for detecting the state of each power storage element 11. The detection line 13a is an electric wire (also referred to as a communication cable, a control cable, a communication line, or a control line) for voltage measurement of the power storage element 11, temperature measurement, or voltage balance between the power storage elements 11. A thermistor (not shown) for measuring the temperature of the power storage element 11 is disposed on the bus bar 13 or the electrode terminal of the power storage element 11, but the description thereof is omitted. A connector 13b is connected to the end portion of the detection line 13a in the Y-axis negative direction. The connector 13b is a connector that is connected to the substrate of the substrate unit 20 described later. That is, the detection line 13a transmits information such as the voltage and temperature of the power storage element 11 to the substrate of the substrate unit 20 via the connector 13b. The detection line 13a also has a function of discharging the power storage element 11 having a high voltage under the control of the substrate to balance the voltage between the power storage elements 11.

[0035] The exterior body 18 is a rectangular (box-shaped) housing (module case) that constitutes the exterior body of the power storage unit 10. That is, the exterior body 18 is disposed outside the power storage element 11 and the like, fixes the power storage element 11 and the like at a predetermined position, and protects them from impacts and the like. The exterior body 18 has an exterior body main body 14 that constitutes the main body of the exterior body 18, an exterior body support 15 that supports the exterior body main body 14, and an exterior body lid 17 that constitutes the lid (outer lid) of the exterior body 18.

[0036] The exterior body main body 14 is a bottomed rectangular box-shaped housing with an opening formed on the upper surface. The exterior body main body 14 is formed of an insulating member such as PC, PP, or PE. The exterior body main body 14 houses a plurality of power storage elements 11, an exhaust portion 50, a bus bar frame 12, and the like.

[0037] A plurality of partition wall portions 142 for supporting the power storage element 11 are provided on the bottom wall inside the exterior body main body 14. The power storage elements 11 are inserted and arranged between adjacent partition wall portions 142. As a result, the intervals between the power storage elements 11 are positioned to be at a predetermined interval. The configuration for supporting and positioning the power storage element 11 on the exterior body main body 14 may be other configurations. The exterior body main body 14 also has a side opening 143 on the side surface. Through this side opening 143, the space between adjacent power storage elements 11 communicates with the space outside the power storage device 1, contributing to the cooling of the power storage device 1 including the power storage elements 11. At the end of the exterior body main body 14 in the +Y-axis direction, a notch portion 141 through which the exhaust port 51 of the exhaust portion 50 penetrates is formed at the upper center thereof. The notch portion 141 is a rectangular notch with an open upper side.

[0038] 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, and plated steel sheets. The exterior body support 15 and the exterior body lid 17 may be formed of members of the same material, or may be formed of members of different materials.

[0039] The exterior body support 15 is a member that supports the exterior body main body 14 from below (in the negative Z-axis direction), and has a bottom 15a, a substrate unit mounting portion 16, connection portions 15b and 15c, and a fixing portion 15d. The bottom 15a is a flat and rectangular portion that constitutes the bottom of the power storage device 1, is parallel to the XY plane and extends in the Y-axis direction, and is disposed below the exterior body main body 14.

[0040] The connection portion 15b is a flat and rectangular portion that stands upright in the positive Z-axis direction from the end portion of the bottom 15a in the negative Y-axis direction toward the exterior body lid 17, and has a fastening portion that protrudes in the negative Y-axis direction from the end portion in the positive Z-axis direction. The connection portion 15b is connected to the exterior body lid 17 at the fastening portion. The connection portion 15b forms a part of the front side surface of the power storage unit 10. The connection portion 15c is a flat and rectangular portion that stands upright in the positive Z-axis direction from the end portion of the bottom 15a in the positive Y-axis direction toward the exterior body lid 17, and has a fastening portion that protrudes in the positive Y-axis direction. The connection portion 15c is connected to the exterior body lid 17 at the fastening portion. The connection portion 15c forms a part of the rear side surface of the power storage unit 10.

[0041] The fixing portion 15d is a flat and rectangular portion that stands upright in the negative Z-axis direction from the end portion of the bottom 15a in the negative Y-axis direction, and is a fastening portion for fixing the power storage device 1 to a structure such as a shelf (not shown). The fixing portion 15d is disposed at the central portion of the bottom 15a in the X-axis direction. In the present embodiment, screwing is used for fixing the fixing portion 15d and the shelf, but any form of fixing method may be used as long as fixing and its release can be freely performed.

[0042] The exterior body cover 17 is a member that covers the upper part of the plurality of power storage elements 11. Specifically, the exterior body cover 17 is a member arranged to close 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 and rectangular portion that constitutes the upper surface portion of the power storage device 1, is parallel to the XY plane and extends in the Y-axis direction, and is arranged above the exterior body main body 14. The connection portion 17b is arranged at the end portion of the top plate portion 17a in the minus Y-axis direction, is bent toward the exterior body support 15, and has a fastening portion that protrudes in the minus Y-axis direction, and is connected to the connection portion 15b of the exterior body support 15. The connection portion 17c has a flat and rectangular portion erected in the minus Z-axis direction from the end portion of the top plate portion 17a in the plus Y-axis direction, and a fastening portion that protrudes in the plus 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 power storage unit 10. In this way, the exterior body support 15 and the exterior body cover 17 are configured to be fixed by connecting the connection portions 15b and 15c and the connection portions 17b and 17c with screws or the like at each fastening portion in a state where the exterior body main body 14 is sandwiched from above and below. Thereby, each member (bus bar frame 12, plurality of power storage elements 11, and exhaust portion 50) accommodated in the exterior body main body 14 is sandwiched in the vertical direction by the exterior body support 15 and the exterior body cover 17. For this reason, the exterior body cover 17 covers the upper part of the exhaust portion 50.

[0043] In the connection portion 17c of the exterior body cover 17, an opening 171 (see FIG. 4) through which the exhaust port 51 of the exhaust portion 50 penetrates is formed at the center of the upper end portion (the end portion in the plus Z-axis direction). The opening 171 has a planar shape corresponding to the outer shape of the exhaust portion 50. In the present embodiment, the opening 171 has a rectangular shape in plan view. The exhaust port 51 of the exhaust portion 50 protrudes from the exterior body 18 by penetrating the opening 171 and the notch portion 141 of the exterior body main body 14.

[0044] The bus bar frame 12 has electrical components such as the electrode terminals (positive electrode terminal 11b and negative electrode terminal 11c) of the power storage element 11, the bus bar 13, and the detection line 13a. Therefore, in order to ensure electrical insulation from the exterior body lid 17 which is a metal part, an insulating plate may be disposed on the back surface (lower surface) of the top plate portion 17a of the exterior body lid 17. The insulating plate may be screwed or attached to the top plate portion 17a.

[0045] The substrate unit 20 shown in FIG. 1A is a device capable of monitoring the state of the power storage element 11 included in the power storage unit 10 and controlling the power storage element 11. In the present embodiment, the substrate unit 20 is a flat rectangular member attached to the longitudinal end of the power storage unit 10, that is, the side surface in the minus Y-axis direction of the power storage unit 10. Specifically, the substrate unit 20 is rotatably attached to a substrate unit attachment portion 16 (see FIG. 2) provided on the front surface of the exterior body support 15 included in the exterior body 18 of the power storage unit 10. The substrate unit attachment portion 16 is a part of the connection portion 15b. More specifically, a downward U-shaped holding portion is provided below the substrate unit attachment portion 16, and the rotation axis of the substrate unit 20 is accommodated in the holding portion.

[0046] As shown in FIGS. 1B and 1C, the substrate 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 plurality of power storage devices 1 that connects the plurality of 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 the control device of the entire power storage device group. 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 easy to move and handling is troublesome. In the present embodiment, the substrate unit 20 has cable guides 21 and 22, and by accommodating the communication cable between a pair of guide walls, the movement of the communication cable is suppressed and handling becomes easy. The connection between the plurality of power storage devices 1 by the communication cable includes a vertical connection and a horizontal connection. The cable guide 21 has guide walls extending in the Z-axis direction and can accommodate and fix the vertical communication cable. The cable guide 22 has guide walls extending in the X-axis direction and can accommodate and fix the horizontal communication cable. As a result, the connection between the power storage devices 1 by the communication cable has the effect of being able to correspond to both the vertical direction and the horizontal direction.

[0047] [2 Busbar Frame] Next, the details of the busbar frame 12 will be described. FIG. 3 is an exploded perspective view showing the schematic configuration of the exhaust unit 50 and the busbar frame 12 according to the first embodiment. Specifically, FIG. 3 is a perspective view of the exhaust unit 50 and the busbar frame 12 viewed from above.

[0048] As shown in FIG. 3, the bus bar frame 12 is a frame-shaped member that is disposed on a plurality of power storage elements 11 and holds a plurality of bus bars 13. Specifically, the bus bar frame 12 includes a first holding portion 71, a second holding portion 72, and a connecting portion 73. Among the plurality of detection lines 13a, the plurality of detection lines 13a held by the first holding portion 71 are referred to as first detection lines. Among the plurality of detection lines 13a, the plurality of detection lines 13a held by the second holding portion 72 are referred to as second detection lines.

[0049] The first holding portion 71 is a portion on the +X-axis direction side (one side) of the bus bar frame 12, and is a portion that holds a first bus bar group, a positive power supply cable 31, and a plurality of first detection lines. The plurality of first detection lines are connected to an electrode terminal (positive electrode terminal 11b or negative electrode terminal 11c) in the +X-axis direction of each power storage element 11 or to a bus bar 13 included in the first bus bar group.

[0050] The first holding portion 71 is disposed in the +X-axis direction with respect to the gas discharge valve 111 of each power storage element 11. The first holding portion 71 has a first outer wall portion 711 that surrounds the outer periphery of the first holding portion 71.

[0051] The first outer wall portion 711 is a rectangular frame wall that is long in the Y-axis direction in a top view, and a first bus bar group, a positive power supply cable 31, and a plurality of first detection lines are accommodated therein. A pair of first notches 711a and 711b are formed at an end portion of the first outer wall portion 711 in the -Y-axis direction. The positive power supply cable 31 and the plurality of first detection lines are disposed so as to penetrate one of the pair of first notches 711a and 711b, i.e., the first notch 711a. The negative power supply cable 32 is disposed so as to penetrate the other first notch 711b.

[0052] Within the first outer wall portion 711, the 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 discharge valve 111 of each power storage element 11 and each bus bar 13 included in the first bus bar group. Thus, the first cable path portion 715 is disposed inward in the X-axis direction from the first bus bar group within the bus bar frame 12.

[0053] The first cable path portion 715 is provided with a positive power supply cable 31 and a plurality of first detection lines. The first cable path portion 715 forms a routing path for the positive power supply cable 31 and the plurality of first detection lines. The plurality of first detection lines and the positive power supply cable 31 are disposed within the first cable path portion 715 and are not disposed between the first holding portion 71 and the second holding portion 72, that is, on the connecting portion 73.

[0054] The second holding portion 72 is a portion on the negative X-axis direction side (the other side) of the bus bar frame 12. The second holding portion 72 holds the second bus bar group, the electrode terminals (positive electrode terminal 11b or negative electrode terminal 11c) in the negative X-axis direction of each power storage element 11, or a plurality of second detection lines connected to the bus bars 13 included in the second bus bar group.

[0055] The second holding portion 72 is disposed in the negative X-axis direction from the gas discharge valve 111 of each power storage element 11. The second holding portion 72 has a second outer wall portion 721 that surrounds the outer periphery of the second holding portion 72.

[0056] The second outer wall portion 721 is a rectangular frame wall that is long in the Y-axis direction in top view, and the second bus bar group and a plurality of second detection lines are accommodated therein. A second notch 721a is formed at the end in the negative Y-axis direction of the second outer wall portion 721. A plurality of second detection lines are disposed so as to penetrate the second notch 721a.

[0057] In the second outer wall portion 721, the end region in the positive X-axis direction 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 discharge valve 111 of each power storage element 11 and each bus bar 13 included in the second bus bar group. Thus, 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.

[0058] A plurality of second detection lines are disposed in the second cable path portion 725. The plurality of second detection lines are disposed within the second cable path portion 725 and are not disposed between the first holding portion 71 and the second holding portion 72, that is, on the connecting portion 73.

[0059] 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 extending in the X-axis direction with 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 disposed at a predetermined interval in the Y-axis direction. An exhaust portion 50 is disposed 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 disposed outside the power storage element 11 at the end in the negative Y-axis direction. The beam portion 731 at the end in the positive Y-axis direction is disposed outside the power storage element 11 at the end in the positive Y-axis direction. The other beam portions 731 are disposed between a pair of adjacent power storage elements 11. Thus, the plurality of beam portions 731 are disposed at positions retracted from the gas discharge valve 111 of each power storage element 11. In other words, the gas discharge valve 111 of each power storage element 11 is in a state of being exposed from between the plurality of beam portions 731 in a top view.

[0060] The part of the first outer wall portion 711 facing the connecting portion 73 and the part 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 and rectangular portion that is parallel to the YZ plane and extends in the Y-axis direction. Between the pair of third wall portions 716, the exhaust portion 50 is accommodated on a plurality of beam portions 731. A plurality of sets of concave portions for positioning the exhaust portion 50 are formed on the upper edge portions of the pair of third wall portions 716. In the present embodiment, two sets of the pair of concave portions are provided. The first set of concave portions is a pair of first concave portions 717 arranged in the positive Y-axis direction from the center of the bus bar frame 12 in the Y-axis direction. The pair of first concave portions 717 are each formed in a rectangular shape with an open upper side when viewed in the X-axis direction and are arranged at the same position in the Y-axis direction. The second set of concave portions is a pair of second concave portions 727 arranged in the negative Y-axis direction from the center of the bus bar frame 12 in the Y-axis direction. The pair of second concave portions 727 are each formed in a rectangular shape with an open upper side when viewed in the X-axis direction and are arranged at the same position in the Y-axis direction. Thus, the bus bar frame 12 that houses the exhaust portion 50 in the connecting portion 73 is an example of a frame member.

[0061] [3 Exhaust portion] As shown in FIGS. 3 to 5, the exhaust portion 50 includes an exhaust member 60, a lid member 65, and a plurality of seal members 95. The exhaust member 60 and the lid member 65 form an exhaust path 59.

[0062] FIG. 4 is an exploded perspective view showing the schematic configuration of the exhaust portion 50 and the exterior body lid 17 according to Embodiment 1. Specifically, FIG. 4 is a perspective view of the exhaust portion 50 and the exterior body lid 17 viewed from below. FIG. 5 is a cross-sectional view of the periphery of the exhaust portion 50 of the cross-section obtained by cutting the power storage device 1 of Embodiment 1 shown in FIG. 1 with a plane perpendicular to the Y-axis. FIG. 5 is a cross-sectional view showing a first divided body 66 which is a part of the exhaust portion 50 according to Embodiment 1 and the members around it.

[0063] [3-1 Exhaust member] The exhaust member 60 is disposed directly above the gas discharge valve 111 of each power storage element 11 in a state of being housed in the bus bar frame 12 as a whole. The exhaust member 60 includes a bottom portion 61 and a pair of first wall portions 62. The bottom portion 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 portion 61 in the X-axis direction. The length of the exhaust member 60 in the Y-axis direction corresponds to the total length of the exterior body main body 14 in the Y-axis direction. For this reason, the entire exhaust member 60 can be housed inside the exterior body main body 14. The exhaust member 60 is divided into two at an intermediate position in the Y-axis direction. Among these, one is the first divided body 66 and the other is the second divided body 67. The first divided body 66 and the second divided body 67 have substantially the same length in the Y-axis direction. The first divided body 66 is disposed in the +Y-axis direction with respect to the second divided body 67. That is, the first divided body 66 is disposed on the exhaust port 51 side in the exhaust path 59.

[0064] The exhaust member 60 composed of the first divided body 66 and the second divided body 67 serves as an exhaust path for the high-temperature gas discharged from the power storage element 11, and thus is formed of a resin having high heat resistance. In the present embodiment, the first divided body 66 and the second divided body 67 are formed of polyphenylene sulfide (PPS), which is a resin material having high heat resistance. The bus bar frame 12 does not necessarily have heat resistance and is formed 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 divided body 66, and the second divided body 67 are integrally molded with a single resin, it is necessary to mold all of them with a resin having high heat resistance. However, in the present embodiment, since it is only necessary to form only the first divided body 66 and the second divided body 67, which are separate from the bus bar frame 12, with a resin having high heat resistance, the amount of use of the resin can be suppressed.

[0065] The exhaust member 60 is a long member extending in the Y-axis direction, which is the arrangement direction of the power storage elements 11. In the present embodiment, since PPS, which is a heat-resistant resin, has worse moldability than normal resin materials such as PP, the exhaust member 60 is formed as a member divided in the Y-axis direction instead of an integrally molded product so as to be easily molded.

[0066] [3-1-1 First Divided Body] Figs. 6 and 7 are perspective views showing the schematic configurations of the first divided body 66 and the second divided body 67 according to Embodiment 1. Specifically, Fig. 6 is a perspective view of the first divided body 66 and the second divided body 67 viewed from above, and Fig. 7 is a perspective view of the first divided body 66 and the second divided body 67 viewed from below.

[0067] As shown in Figs. 5 to 7, the first divided body 66 is formed in a U shape that is open upward when viewed in the Y-axis direction, and is a member that is long 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.

[0068] At both ends in the X-axis direction on the upper surface of the first bottom portion 661, a pair of first divided wall portions 662 are erected. On the upper surface of the first bottom portion 661, a pair of first grooves 663 that extend along the Y-axis direction are formed in the vicinity of each first divided wall portion 662. In each first groove 663, each second wall portion 652 of the lid member 65 is disposed.

[0069] At the central portion in the X-axis direction on the first bottom portion 661, a plurality of first hole portions 664 (eight in this embodiment) for exposing the gas discharge valves 111 of the respective power storage elements 11 are formed. The plurality of first hole portions 664 are arranged at predetermined intervals along the Y-axis direction. The first hole portion 664 is a through hole formed in a circular shape in plan view. The shape of the first hole portion 664 in plan view may be any shape, and other shapes in plan view include an elliptical shape, an oval shape, a polygonal shape, and the like.

[0070] On the outer bottom surface of the first bottom portion 661, a plurality of annular convex portions 665 surrounding the respective first hole portions 664 are provided. The annular convex portion 665 is a convex strip portion continuously formed in an annular shape in plan view and is arranged concentrically with the first hole portion 664. The shape of the annular convex portion 665 in plan view may be any shape as long as it is a continuous annular shape, and other shapes in plan view include an elliptical annular shape, an oval annular shape, a polygonal annular shape, and the like. The annular convex portion 665 has a tapered cross-sectional shape when cut by a plane orthogonal to the circumferential direction of the annular convex portion (see FIG. 5). The annular convex portion 665 has a uniform cross-sectional shape over the entire circumference. In the present embodiment, a case where the cross-sectional shape of the annular convex portion 665 is tapered as a whole is illustrated, but only the tip portion may be tapered. In the present embodiment, the tip portion of the annular convex portion 665 is formed as a flat surface, but it may be formed in a angular shape. Inside the annular convex portion 665, a flange portion 669 forming the first hole portion 664 is continuously provided in the circumferential direction. The flange portion 669 is an annular portion protruding inward in the plane direction of the XY plane from the annular convex portion 665. Compared with the case where there is no flange portion 669, the inner diameter of the first hole portion 664 is smaller.

[0071] On the outer bottom surface of the first bottom portion 661, a plurality of positioning protrusions 666 protruding downward are formed. The positioning protrusion 666 is a portion that abuts against one power storage element 11 to perform relative positioning between the power storage element 11 and the first divided body 66.

[0072] The plurality of positioning protrusions 666 protrude from any position in the Y-axis direction of the first divided body 66 toward any one of the plurality of power storage elements 11. Specifically, the plurality of positioning protrusions 666 are arranged in the vicinity of the fourth first hole 664 from one end of the first divided body 66 in the minus Y-axis direction. That is, the plurality of positioning protrusions 666 abut against the fourth power storage element 11 from one end of the first divided body 66 in the minus Y-axis direction. In this way, the plurality of positioning protrusions 666 are arranged only at the central portion in the Y-axis direction in the first divided body 66. The central portion of the first divided body 66 is a region including the central position in the Y-axis direction. Specifically, among the eight power storage elements 11 corresponding to the first divided body 66, the region of the first divided body 66 that overlaps the fourth and fifth power storage elements 11 from the end in a top view is defined as the central portion of the first divided body 66.

[0073] FIG. 8 is a plan view schematically showing the positional relationship between the plurality of positioning protrusions 666 and the power storage element 11 according to Embodiment 1. 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 power storage element 11 from the plus Y-axis direction and a pair of second positioning protrusions 666b that abut against the fourth power storage element 11 from the minus Y-axis direction.

[0074] 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 arranged at positions corresponding to the pair of first positioning protrusions 666a in the X-axis direction.

[0075] FIG. 9 is a cross-sectional view showing a schematic configuration of the positioning protrusion 666 according to the embodiment. FIG. 9 shows a state in which the first divided body 66 is being assembled to the power storage element 11. In FIG. 9, one of the pair of first positioning protrusions 666a and one of the pair of second positioning protrusions 666b are illustrated, but since the same applies to the other of the pair of first positioning protrusions 666a and the other of the pair of second positioning protrusions 666b, these descriptions are omitted.

[0076] One first positioning protrusion 666a and one second positioning protrusion 666b are a pair of positioning protrusions 666 arranged at positions sandwiching the power storage element 11 in the Y-axis direction. One first positioning protrusion 666a protrudes downward from the outer bottom surface of the first bottom portion 661. One first positioning protrusion 666a is a substantially rectangular protrusion, and a corner portion 666c on the side of the power storage element 11 is chamfered at its tip.

[0077] One second positioning protrusion 666b protrudes downward from the outer bottom surface of the first bottom portion 661. One second positioning protrusion 666b is a substantially rectangular protrusion, and a corner portion 666d on the side of the power storage element 11 is chamfered at its tip.

[0078] That is, the distance between one first positioning protrusion 666a and one second positioning protrusion 666b gradually narrows upward due to the corner portions 666c and 666d. Therefore, when assembling the first divided body 66 to the power storage element 11, the upper part of the power storage element 11 is guided by the corner portions 666c and 666d and fits 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 a state of abutting against the power storage element 11. Specifically, the power storage element 11 is sandwiched by a pair of first positioning protrusions 666a and a pair of second positioning protrusions 666b. For this reason, displacement in the Y-axis direction between the first divided body 66 and the power storage element 11, or displacement in the rotational direction centered on the Z-axis between the first divided body 66 and the power storage element 11 can be suppressed. In this way, the first divided body 66 can be accurately aligned with one power storage element 11.

[0079] The first divided body 66 is positioned in the X-axis direction by being arranged between a pair of third wall portions 716 of the bus bar frame 12. Since the first divided body 66 is placed on the power storage element 11, positioning in the Z-axis direction is performed.

[0080] The power storage element 11 has a flat shape with a thickness (dimension in the Y-axis direction) smaller than the width (dimension in the X-axis direction). Therefore, on the upper wall portion 11d of the power storage element 11, the distance from the gas discharge valve 111 to the edge of the upper wall portion 11d is such that the distance in the thickness direction of the power storage element 11 is smaller than the distance in the width direction, and the difference is also large. In other words, the space around the gas discharge valve 111 is narrow in the thickness direction and wide in the width direction. Therefore, when arranging other members around the gas discharge valve 111, the member arrangement area is relatively narrow on the side in the Y-axis direction (the arrangement direction of the power storage elements 11) of the gas discharge valve 111, and relatively wide on the side in the X-axis direction. Examples of the members arranged around the gas discharge valve 111 include the annular convex portion 665 of the first divided body 66 and the sealing material 95.

[0081] Since the member arrangement area is narrow on the side in the Y-axis direction of the gas discharge valve 111, it is necessary to suppress displacement in order to arrange other members in this area. In the present embodiment, the first positioning protrusions 666a and 666b of the first divided body 66 are directly brought into contact with the long side surface of the power storage element 11 from the Y-axis direction without intervening other members for positioning. As a result, it is possible to easily and accurately align the annular convex portion 665 of the first divided body 66 and the gas discharge valve 111.

[0082] The first positioning protrusion 666 only needs to be in contact with at least one of the power storage elements 11, and may be in contact with the power storage element 11 at the outermost end in the arrangement direction. In the present embodiment, since the plurality of power storage elements 11 are arranged at predetermined positions of the exterior body main body 14, if the first divided body 66 is positioned at the outermost power storage element 11, it is arranged so as to have a predetermined positional relationship with the other power storage elements 11 as well. At this time, preferably, it may be in contact with the long side surface of the power storage element 11 as in the present embodiment, but the contact method is not limited to this. It may be a positioning protrusion that protrudes so as to face the upper wall portion 11d of the power storage element 11. Preferably, the first positioning protrusion 666 is preferably in contact with the other long side surface rather than the outermost long side surface of the plurality of arranged power storage elements 11. Although details will be described later, first hole portions 664 exist on both sides in the Y-axis direction of the positioning protrusion 666, and the distance to the first hole portion 664 farthest from the positioning protrusion 666 can be shortened as much as possible, and an increase in tolerance can be suppressed.

[0083] 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. 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. That is, the tolerance of the distance to the center of the first hole 664 becomes larger 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 (distance) tolerance 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. 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.

[0084] 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 so 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 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.

[0085] FIG. 10 is a cross-sectional view showing each first interference portion 668 according to Embodiment 1 and members around it. As shown in FIG. 10, each first interference portion 668 is accommodated in a pair of first recesses 717 of the bus bar frame 12. Thereby, 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.

[0086] As shown in FIGS. 6 and 7, at one end of the first divided body 66 in the minus Y-axis direction, a first engaging portion 68 that engages with the other end of the second divided body 67 in the plus Y-axis direction is formed. The first engaging portion 68 has an overlapping portion 681 and a first flange portion 682.

[0087] The overlapping portion 681 is a portion that overlaps with the other end of the second divided body 67 in the Z-axis direction view (plan view). Specifically, the overlapping portion 681 protrudes in the minus Y-axis direction from one end of the first bottom portion 661 of the first divided body 66. That is, 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 plate-like and rectangular portion that is parallel to the XY plane and extends in the Y-axis direction.

[0088] The first flange portion 682 protrudes downward from one end of the first bottom portion 661 of the first divided body 66. That is, the first flange portion 682 protrudes toward the power storage element 11. The first flange portion 682 is a flat plate-like and rectangular portion that is parallel to the XZ plane and extends in the Z-axis direction. The engagement relationship between the first engaging portion 68 and the second divided body 67 will be described later.

[0089] [3-1-2 Second Divided Body] Next, the second divided body 67 will be described. Since the second divided body 67 basically has the same configuration as the first divided body 66, first, the correspondence between each part of the second divided body 67 and each part of the first divided body 66 will be described, and the detailed description thereof will be omitted. After that, the differences from the first divided body 66 will be described in detail.

[0090] As shown in FIGS. 6 and 7, the second divided body 67 is formed in a U shape that is open upward when viewed in the Y-axis direction and is a member that is long in the Y-axis direction. The second divided body 67 includes a second bottom portion 671 corresponding to the first bottom portion 661 and a pair of second divided wall portions 672 corresponding to the respective first divided wall portions 662. The second bottom portion 671 is provided with a pair of second grooves 673 corresponding to the respective first grooves 663, a plurality of second hole portions 674 corresponding to the respective first hole portions 664, a plurality of annular convex portions 675 corresponding to the respective annular convex portions 665, and a plurality of positioning protrusions 676 corresponding to the respective 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 positive Y-axis direction.

[0091] A plurality of second interference portions 678 are provided on the pair of second divided wall portions 672 so as to correspond to the respective first interference portions 668. Each second interference portion 678 is housed in a pair of second recesses 727 of the bus bar frame 12. Due to such a corresponding relationship, the same operational effects as those of the corresponding portions of the first divided body 66 can also be obtained in each portion of the second divided body 67.

[0092] Next, portions of the second divided body 67 that are different from the first divided body 66 will be described in detail. At one end portion of the second divided body 67 in the negative Y-axis direction, a terminal wall portion 677 for closing the exhaust path 59 is formed continuously with the second bottom portion 671 and the pair of second divided wall portions 672. The terminal wall portion 677 is a flat plate-shaped and 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 portion of the power storage device 1 in the negative Y-axis direction.

[0093] At the other end portion of the second divided body 67 in the positive Y-axis direction, a second engaging portion 69 that engages with the first engaging portion 68 of the first divided body 66 is formed.

[0094] FIG. 11 is a cross-sectional view showing the engagement relationship between the first engaging portion 68 and the second engaging portion 69 according to Embodiment 1. As shown in FIGS. 6, 7, and 11, the second engaging portion 69 has a housing recess 691 and a second flange portion 692.

[0095] The accommodation recess 691 is a part for accommodating the overlap portion 681. Specifically, the accommodation recess 691 is formed on the upper surface of the other end portion in the second bottom portion 671. The accommodation recess 691 is formed in a shape that can accommodate the overlap portion 681 in a view from the Z-axis direction. The accommodation recess 691 is a recess that is recessed in the negative Z-axis direction with the end portion in the positive Y-axis direction being open and has a bottom downward. When the overlap portion 681 is accommodated in the accommodation recess 691, the overlap portion 681 overlaps the other end portion of the second divided body 67 in a plan view (view from the Z-axis direction). As a result, the gap at the adjacent portion between the first divided body 66 and the second divided body 67 becomes a bent space in a cross-sectional view, making it difficult for gas to pass through and suppressing gas leakage from the adjacent portion.

[0096] The tip of the overlapping portion 681 accommodated in the accommodation recess 691 is arranged at an interval S1 in the Y-axis direction with respect to the wall surface of the accommodation recess 691. Due to variations in the longitudinal dimensions of the first divided body 66 and the second divided body 67, there is a possibility that the tip of the overlapping portion 681 in the Y-axis direction may interfere with the wall surface of the end portion of the accommodation recess 691 in the Y-axis direction. If interference occurs, it will lead to defective assembly of the power storage device 1. In the present embodiment, even when the first divided body 66 and the second divided body 67 are combined with members having the maximum values within the dimensional tolerances respectively, the tip of the overlapping portion 681 is configured to be spaced apart by the interval S1 from the other end portion of the second divided body 67. This interval S1 can absorb the dimensional variations between the first divided body 66 and the second divided body 67, and can suppress the occurrence of defective assembly. Even when the first divided body 66 and the second divided body 67 are combined with members having the minimum values within the dimensional tolerances respectively, in the present embodiment, the overlapping portion 681 is configured to cover the upper part of the other end portion of the second divided body 67. Thereby, gas leakage from the adjacent portions of the first divided body 66 and the second divided body 67 is suppressed. When the first divided body 66 and the second divided body 67 are manufactured with high dimensional accuracy and the tip of the overlapping portion 681 is brought into contact with the other end portion of the second divided body 67, since the interval S1 disappears, gas leakage can also be suppressed, which is preferable. In FIG. 11, the case where the bottom surface of the overlapping portion 681 is separated from the bottom of the accommodation recess 691 in the Z-axis direction is illustrated, 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 more effectively suppressed.

[0097] The second flange portion 692 protrudes downward from the other end of the second bottom portion 671 of the second divided body 67. That is, the second flange portion 692 protrudes toward the power storage element 11. The second flange portion 692 is a flat and rectangular portion that is parallel to the XZ plane and extends in the Z-axis direction. The second flange portion 692 faces the first flange portion 682 with a space S2 therebetween in the Y-axis direction. If the space S2 is smaller than the space S1, the second flange portion 692 and the first flange portion 682 may come into contact with each other before the space S1 satisfies the maximum amount of dimensional variation within the tolerance that can be absorbed, and there is a possibility that the desired dimensional variation absorption effect cannot be obtained. For this reason, the space S2 between the second flange portion 692 and the first flange portion 682 is set to be equal to or greater than the space S1.

[0098] It is also assumed that the first divided body 66 and the second divided body 67 are displaced in the arrangement direction (Z-axis direction) of the power storage element 11 and the exhaust portion 50 due to their respective tolerances. In the present embodiment, the first flange portion 682 is formed at one end of the first bottom portion 661, and the second flange portion 692 facing the first flange portion 682 in the Y-axis direction is formed at the other end of the second bottom portion 671. Therefore, even if the first divided body 66 and the second divided body 67 are displaced in the Z-axis direction, the facing relationship between the first flange portion 682 and the second flange portion 692 can be maintained, and the gap between the adjacent portions of the first divided body 66 and the second divided body 67 can be narrowed. Thereby, even if the first divided body 66 and the second divided body 67 are displaced in the Z-axis direction, gas leakage can be suppressed.

[0099] By providing the first flange portion 682 on the first divided body 66 and the second flange portion 692 on the second divided body 67, the creepage distance between the power storage element 11 and the end of the second wall portion 652 of the lid member 65 which is a metal member is ensured at the boundary portion between the first divided body 66 and the second divided body 67. By providing the third flange portion 683 at the end of the second divided body 67 on the plus Y-axis side (exhaust port 51 side), the creepage distance between the power storage element 11 and the end of the second wall portion 652 of the lid member 65 which is a metal member is ensured at the exhaust port 51 side end of the first divided body 66.

[0100] A description will be given of the case where the gas discharge valve 111 of the energy storage element 11 operates. When the gas discharge valve 111 operates and the heated gas is discharged from the exhaust path 59 to the outside, the gas may catch fire when it comes into contact with air (oxygen) at the exhaust port of the exhaust path 59. The energy storage element 11 on the side of the first divided body 66 of the exhaust member 60 and close to the exhaust port 51 is likely to come into contact with air (oxygen) and catch fire. Conversely, since the end portion of the exhaust path 59 in the +Y-axis direction is blocked, the energy storage element 11 on the side of the second divided body 67 is less likely to come into contact with air (oxygen) and has a low possibility of catching fire. The gas from the energy storage element 11 on the side of the second divided body 67 passes through the exhaust path 59 toward the exhaust port 51, and its temperature decreases, reducing the possibility of catching fire. 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 contact of the gas with air (oxygen) is suppressed. When gas is discharged from the energy storage element 11 close to the exhaust port 51 on the side of the first divided body 66, most of it goes toward the exhaust port 51. If the gas discharged from the exhaust port 51 catches fire, the fire may spread around the energy storage device 1 side and enter the exhaust path 59 from the boundary portion (gaps S1 and S2) between the first divided body 66 and the second divided body 67, reaching the gas discharge valve 111 of other normal energy storage elements 11. Other energy storage elements 11 on the side of the first divided body 66 are exposed to high temperatures due to the energy storage element 11 whose gas discharge valve 111 has operated, so there is also a possibility that the fire will spread. In the present embodiment, the overlapping portion 681 of the first divided body 66 extends toward the side opposite to the exhaust port 51 (in the -Y-axis direction), and the overlapping portion 681 is arranged above the other end of the second divided body 67. Therefore, the fire that has entered from the boundary portion can be received by the side of the second divided body 67 (the +Y-axis direction side) that is not relatively affected by heat. The fire received by the side of the second divided body 67 weakens, and the spread of the fire can be suppressed.

[0101] [3-1-3 Installation locations of the first interference portion and the second interference portion] Next, the installation locations of each first interference portion 668 of the first divided body 66 and each second interference portion 678 of the second divided body 67 will be described. FIG. 12 is a plan view schematically showing the first divided body 66 and the second divided body 67 according to the embodiment.

[0102] As shown in FIG. 12, in the first divided body 66, a pair of first interference portions 668 are arranged at positions that are not point-symmetrical with respect to the center G1 of the first divided body 66 in plan view. Specifically, the pair of first interference portions 668 are installed at positions displaced by a first distance L1 in the +Y-axis direction from the center G1. For this reason, when the first divided body 66 is rotated 180 degrees about the Z-axis with the center G1 as a reference, the pair of first interference portions 668 are arranged at positions displaced by the first distance L1 in the -Y-axis direction from the center G1 (the broken line portion in the first divided body 66 of FIG. 12). Each first recess 717 of the bus bar frame 12 has a function of positioning the first divided body 66 before rotation. For this reason, if each first interference portion 668 of the first divided body 66 after rotation is accommodated in each first recess 717, the first divided body 66 will be displaced in the Y-axis direction by about twice the first distance L1. As a result, the assembly worker can immediately recognize that the first divided body 66 has been misaligned. Even if the worker overlooks it, the misalignment can be detected because the assembly of this process cannot be carried out.

[0103] 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 plan view. The pair of second interference portions 678 have a different positional relationship in plan view from the pair of first interference portions 668 of the first divided body 66. Specifically, each second interference portion 678 is installed at a position displaced by a second distance L2 in the +Y-axis direction from the center G2. Since the second distance L2 is different from the first distance L1, the first interference portions 668 and the second interference portions 678 have different positional relationships in plan view. The first interference portions 668 and the second interference portions 678 are displaced from each other by a distance L10 in the Y-axis direction. In the present 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.

[0104] 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 portions 678 are arranged at positions shifted in the minus Y-axis direction by a second distance L2 from the center G2 (the broken line portion in the second divided body 67 in FIG. 12). Each second recess 727 of the bus bar frame 12 has a function of positioning the second divided body 67 before rotation. Therefore, if each second interference portion 678 of the second divided body 67 after rotation is accommodated in each second recess 727, the second divided body 67 will be displaced in the Y-axis direction by about twice the second distance L2. As a result, an operator can immediately recognize that the second divided body 67 is misaligned. Even if the operator misses it, the misalignment can be detected because the assembly of the process cannot be completed.

[0105] Assume a case where the second divided body 67 before rotation is misaligned with the placement location of the first divided body 66. Specifically, it is a case where each second interference portion 678 of the second divided body 67 before rotation tries 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 will be displaced in the Y-axis direction by about a distance L10 from the normal position of the first divided body 66. Even when the second divided body 67 after rotation is misaligned with the placement location of the first divided body 66, the second divided body 67 will be displaced in the Y-axis direction from the normal position of the first divided body 66. In any case, an operator can immediately recognize that the second divided body 67 is misaligned. Even if the operator misses it, the misalignment can be detected because the assembly of the process cannot be completed. This is the same when the first divided body 66 is misaligned with the installation location of the second divided body 67.

[0106] [3-2 Cover member] As shown in FIGS. 3 to 5, the lid 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 lid member 65 is made of metal and has higher heat dissipation than the exhaust member 60. The lid member 65 is formed in a U-shape with the lower part open when viewed in the Y-axis direction and is a member elongated in the Y-axis direction. The lid member 65 is accommodated in the exhaust member 60 composed of the first divided body 66 and the second divided body 67. The length of the lid member 65 in the Y-axis direction is longer than the total length of the exhaust member 60 in the Y-axis direction. Therefore, the other end portion of the lid member 65 in the positive Y-axis direction can protrude from the exhaust member 60.

[0107] The other end portion of the lid member 65 in the positive Y-axis direction protrudes from the exhaust member 60 with the lower part and the front end face open. On the other hand, the front wall portion 659 of the lid member 65 in the negative Y-axis direction is closed. This front wall portion 659 is a flat plate-shaped and rectangular portion parallel to the XZ plane and covers the end wall portion 677 of the second divided body 67 from the outside. That is, the front wall portion 659 of the lid member 65 and the end wall portion 677 of the second divided body 67 prevent the discharge of gas from one end portion in the Y-axis direction. The lid member 65, in a state of being accommodated in the exhaust member 60, constitutes the gas exhaust path 59 together with the exhaust member 60. Gas is discharged from the open portion at the other end portion of the lid member 65 described above. That is, the other end portion of the lid member 65 is the exhaust port 51 where gas is discharged. As a result, the exhaust port 51 has a U-shape when viewed in the gas traveling direction (viewed in the Y-axis direction). Specifically, the exhaust port 51 has a U-shape with the open portion facing downward. As described above, the exhaust port 51 in the lid member 65 protrudes from the exterior body 18 by passing through the opening 171 and the notch portion 141 of the exterior body main body 14.

[0108] The lid member 65 includes a lid portion 651 and a pair of second wall portions 652, which form a U-shaped outer shape when viewed in the X-axis direction. The lid portion 651 is a plate portion that is substantially C-shaped with the lower part open when viewed in the Y-axis direction. The lid portion 651 is attached to the top plate portion 17a of the exterior body lid 17, and the lid member 65 and the exterior body lid 17 are integrated.

[0109] A pair of second wall portions 652 extend downward from both ends of the lid portion 651 in the X-axis direction. Specifically, each second wall portion 652 is a plate-shaped and rectangular portion that is parallel to the YZ plane and extends in the Y-axis direction.

[0110] 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 inward 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 portions of each second wall portion 652 are accommodated in each first groove 663 of the first divided body 66 and each second groove 673 of the second divided body 67, and are in contact with the bottom surfaces of the respective groove portions. Therefore, the sealing performance between each second wall portion 652 and the exhaust member 60 is higher than when the lower end of each second wall portion 652 is in contact with a flat surface. Each second wall portion 652 overlaps with respect to the 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.

[0111] 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 body lid 17. Due to this pressing force, the pair of first wall portions 62 of the lid member 65 are pressed against the bottom surfaces of each first groove 663 and each second groove 673, so that higher sealing performance can be exhibited. When gas is discharged from the gas discharge valve 111 of the power 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 body lid 17, the floating of the lid member 65 caused by the discharge of gas can be suppressed.

[0112] Also, with respect to the exhaust member 60, since the pressing force directed downward acts from the pair of first wall portions 62 of the lid member 65, the exhaust member 60 presses the plurality of power storage elements 11 downward. As a result, each sealing material 95 interposed between the exhaust member 60 and the power storage element 11 can be surely compressed, and higher adhesion can be exhibited. By this pressing force, the plurality of power storage elements 11 are also supported in the vertical direction.

[0113] [During assembly of the lid member and the exhaust member] Next, the assembly of the lid member 65 and the exhaust member 60 will be described. The first divided body 66 which is a part of the exhaust member 60 and the lid member 65 are exemplified, but the same applies to the second divided body 67.

[0114] FIG. 13 is a cross-sectional view showing a state during the assembly of the lid member 65 and the exhaust member 60 according to Embodiment 1. Specifically, FIG. 13(a) shows the case where the lid member 65 is arranged at a normal position, and FIG. 13(b) shows the case where the lid member 65 is arranged at an abnormal position.

[0115] As shown in FIG. 13(a), when the lid member 65 is arranged at a normal position during assembly, since each second wall portion 652 of the lid member 65 is inserted between the pair of first divided wall portions 662, it does not interfere with each first interference portion 668. That is, without the insertion being inhibited, the lid member 65 is smoothly arranged at the normal position and assembled to the first divided body 66 (see FIG. 10).

[0116] On the one hand, as shown in FIG. 13(b), when the lid member 65 descends while being displaced in the X-axis direction from the normal position during assembly, one of the second wall portions 652 interferes with one of the first interference portions 668 from the direction (Z-axis direction) intersecting the protruding direction (X-axis direction) of the first interference portion 668. When the lid member 65 is displaced in the direction opposite to that shown in FIG. 13(b), the other second wall portion 652 interferes with the other first interference portion 668. That is, when the lid member 65 is to be arranged at an irregular position during assembly, the first interference portion 668 interferes with the second wall portion 652 and inhibits its insertion. As a result, the lid member 65 floats greatly from the normal position (see the broken line portion in FIG. 13(b)). In this state, since the operator can grasp the misinsertion of the lid member 65 at a glance, the assembly work can be redone. Even if the operator misses it, the misinsertion can be detected because the assembly of the process cannot be completed.

[0117] Particularly in the present 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 arranged at the boundary (gap) between the first wall portion 62 and the third wall portion 716. That is, even if the lid member 65 is displaced and the second wall portion 652 tries to enter the boundary (gap) between the first divided wall portion 662 and the third wall portion 716, since the second wall portion 652 abuts against the first interference portion 668, it cannot enter the boundary between the first divided wall portion 662 and the third wall portion 716. Therefore, it is possible to suppress the second wall portion 652 from being misinserted into the boundary between the first divided wall portion 662 and the third wall portion 716.

[0118] Below the boundary between the first divided wall portion 662 and the third wall portion 716, there is a power storage element 11. For this reason, if the second wall portion 652 of the metal lid member 65 is misinserted into this boundary, there is also a risk of contacting the power storage element 11 and causing a short circuit. In the present embodiment, since the second wall portion 652 is not misinserted into the boundary, the occurrence of a short circuit can also be suppressed.

[0119] If the lid member 65 is integrated with the exterior lid body 17 from the time of assembly, the lid member 65 cannot be visually recognized by the operator because the exterior lid body 17 covers the lid member 65 during assembly. For this reason, the lid member 65 is likely to be misaligned. 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 misalignment, the floating as described above does not occur either. Even if there is floating, since the exterior lid body 17 covers the lid member 65, it is difficult to discover the floating from the appearance. In the present embodiment, as shown in FIG. 13(b), since the exterior lid body 17 floats greatly from the normal position together with the lid member 65, the operator can immediately grasp the misinsertion of the lid member 65.

[0120] In the present embodiment, since the front wall portion 659 of the lid member 65 and the end wall portion 677 of the second divided body 67 exist, it is a configuration in which misinsertion is unlikely to occur. However, even in this case, when the exterior lid body 17 is tilted with respect to the Y axis during assembly, partial misinsertion may occur near the exhaust port 51.

[0121] [3-3 Sealing material] Next, the sealing material 95 will be described. As shown in FIG. 5, the sealing material 95 is a member disposed between the power storage element 11 and the exhaust member 60 to maintain airtightness between the power storage element 11 and the exhaust member 60. One sealing material 95 is provided for each power storage element 11. That is, a total of 16 sealing materials 95 are provided for the power storage device 1 (see FIG. 3). Since all the sealing materials 95 have the same shape, one sealing material 95 will be described.

[0122] FIG. 14 is an explanatory diagram showing the sealing material 95 and the circumferential member according to Embodiment 1. 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 installed on the power storage element 11. FIG. 14(b) is a cross-sectional view of the cut surface including the line XIVb-XIVb in FIG. 14(a). In FIG. 14(a), the positional relationship with each part of the first divided body 66 is shown, the first hole portion 664 is indicated by a broken line, and the annular convex portion 665 is indicated by a two-dot chain line.

[0123] As shown in FIG. 14, the sealing material 95 is a plate-shaped member. Specifically, the sealing material 95 is a plate material having a rectangular shape in plan view. The sealing material 95 is placed on the upper wall portion 11d of the container 11a in the power storage element 11. A regulating recess 112 is formed on the upper surface of the upper wall portion 11d. The regulating recess 112 is a portion recessed downward from the peripheral edge portion of the upper wall portion 11d. When the sealing material 95 is disposed in the regulating recess 112, both end portions of the sealing material 95 in the Y-axis direction come into contact with the inner surface of the regulating recess 112, and the movement and rotation in the Y-axis direction are regulated. That is, the regulating recess 112 is a regulating portion that regulates the movement of the sealing material 95. The regulating portion may be in any form as long as it regulates the movement of the sealing material 95. The gasket of the positive electrode or the negative electrode provided on the upper wall portion 11d of the power storage element 11 may be used as the regulating portion that contacts the sealing material 95. The gasket can contact the sealing material 95 from the X-axis direction and can be regulated. An insulating sheet covering the container 11a of the power storage element 11 may be brought into contact with the sealing material 95 to serve as the regulating portion. A dedicated member for regulating the sealing material 95 may be provided on the upper wall portion 11d and used as the regulating portion.

[0124] In the central portion of the sealing material 95, a through-hole portion 96 communicating with each hole portion (the first hole portion 664 and the second hole portion 674) of the exhaust member 60 is formed. The through-hole portion 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 at the central portion in the X-axis direction on its inner peripheral edge. The pair of protruding pieces 97 protrude toward the center of the through-hole portion 96, and their tip surfaces are convex curved surfaces. Therefore, the planar shape of the through-hole portion 96 is a shape in which the first width W1 in the Y-axis direction (the first direction) and the second width W2 in the X-axis direction (the second direction) are different.

[0125] Since the pair of protruding pieces 97 are provided on the inner peripheral edge of the through-hole portion 96 in this way, the width in the Y-axis direction passing through the center of the through-hole portion 96 in a plan view varies because the position of the protruding pieces 97 changes by rotating the sealing material 95. In the present embodiment, the posture in which the arrangement direction of the plurality of power storage elements 11 and the width direction in the first width W1 are parallel is the normal posture of the sealing material 95. That is, when the width of the through-hole portion 96 is measured based on the arrangement direction and the measurement result is the first width W1, it can be determined that the sealing material 95 is arranged in a normal posture.

[0126] Assume a case where the sealing material 95 is displaced from the normal posture and the arrangement direction of the power storage elements 11 and the width direction in the second width W2 are parallel. 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 abnormal posture. That is, by measuring the width of the through-hole portion 96 in the arrangement direction, it is possible to determine the presence or absence of the sealing material 95 and whether it is arranged in a normal posture. Examples of the method 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 machine.

[0127] 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. As long as the first width W1 and the second width W2 are different, the number of protruding pieces 97 may be one or three or more.

[0128] The sealing member 95 is more flexible than the exhaust member 60. That is, the sealing member 95 has the characteristics of being softer and easier to deform than the exhaust member 60. Specifically, the sealing member 95 may have a lower hardness or a lower Young's modulus than the exhaust member 60. In the present embodiment, the sealing member 95 is formed of heat-resistant rubber. Thus, since the sealing member 95 is more flexible than the exhaust member 60, the tip of the annular convex portion 665 of the exhaust member 60 is in close contact with the sealing member 95 in a state where the sealing member 95 is deformed (see FIG. 5). At the time of close contact, since the annular convex portion 665 continuously surrounds the first hole portion 664 and the through hole portion 96 over the entire circumference, the space between the exhaust member 60 and the sealing member 95 can be reliably sealed. Thereby, the space between the gas discharge valve 111 and the exhaust member 60 can be reliably sealed.

[0129] [Description of effects] As described above, according to the power storage device 1 according to the present embodiment, the first divided body 66 constituting the exhaust member 60 is provided with the positioning protrusions 666 that directly contact the power storage element 11. Therefore, in the exhaust member 60 and the power storage element 11, the relative position is determined only between the two. That is, no other members are interposed, and the accumulation of tolerances is minimized. Therefore, the dimensional variation during the assembly of the exhaust member 60 and the power storage element 11 can be reduced, and the positional deviation between each first hole portion 664 and each gas discharge valve 111 can be suppressed. The same applies to the second divided body 67.

[0130] Since the pair of positioning protrusions 666 sandwich the power storage elements 11 in the arrangement direction (Y-axis direction) of the plurality of power storage elements 11, the positioning of the power storage elements 11 and the first divided body 66 in the arrangement direction can be surely performed. Since the first divided body 66 is positioned at two locations with respect to the power storage element 11, the rotation of the first divided body 66 with respect to the power storage element 11 is also restricted. From these facts, the stability of the alignment between the first divided body 66, which is a part of the exhaust member 60, and the power storage element 11 can be enhanced. The same applies to the second divided body 67.

[0131] Each of the pair of positioning protrusions 666 has its opposing corners 666c chamfered, so that the corners 666c of the pair of positioning protrusions 666 function as guide portions for guiding the power storage element 11. Thereby, the power storage element 11 can be smoothly inserted between the pair of positioning protrusions 666. The same applies to the second divided body 67.

[0132] Since the pair of positioning protrusions 666 are arranged in a direction (X-axis direction) intersecting the arrangement direction of the plurality of power storage elements 11, the first divided body 66 is positioned at two locations with respect to the power storage element 11. Thereby, rotation of the first divided body 66 with respect to the power storage element 11 can be restricted, and the stability of the alignment between the first divided body 66, which is a part of the exhaust member, and the power storage element 11 can be further enhanced. The same applies to the second divided body 67.

[0133] Since the positioning protrusions 666 are arranged only at the central portion of the first divided body 66, the positioning protrusions 666 abut against and are positioned with respect to the power storage element 11 arranged at the center among the plurality of power storage elements 11. That is, accumulation of tolerances in the first divided body 66 can be suppressed. Therefore, the first divided body 66, which is a part of the exhaust member 60, and the power storage element 11 can be more accurately aligned. The same applies to the second divided body 67.

[0134] When the lid member 65 covers the exhaust passage 59 in a normal position, the first interference portion 668 does not interfere with the second wall portion 652. Therefore, insertion of the lid member 65 into the normal position is not hindered, and the lid member 65 can be smoothly arranged in the normal position. On the other hand, when the lid member 65 covers the exhaust passage 59 in an abnormal position, the first interference portion 668 interferes with the second wall portion 652 in a direction (Z-axis direction) intersecting the protruding direction of the first interference portion 668. For this reason, when the second wall portion 652 of the lid member 65 is about to be arranged in an abnormal position during assembly, the first interference portion 668 interferes with the second wall portion 652 and inhibits its insertion. As a result, since the lid member 65 floats more than when it is arranged in a normal position, an operator can grasp the misinsertion of the lid member 65 at a glance. Therefore, it is possible to prevent the lid member 65 from being installed at the wrong position.

[0135] Since the first interference portions 668 are formed on respective first divided wall portions 662 which are parts of the pair of first wall portions 62, the pair of first interference portions 668 can suppress the misinsertion of the lid member 65. Therefore, it is possible to more reliably prevent the lid member 65 from being installed at the wrong position.

[0136] The first interference portions 668 of the respective first divided wall portions 662 which are parts of the pair of first wall portions 62 are arranged at positions that are not point-symmetrical with respect to the center G1 of the first divided body 66 in plan view. For this reason, when an operator rotates the first divided body 66 by 180 degrees and houses it in the bus bar frame 12 during assembly, the first divided body 66 is displaced from the normal position starting from the pair of first interference portions 668. Thereby, the operator can easily recognize the misplacement of the first divided body 66.

[0137] Since the lid member 65 is covered by the exterior body lid 17, when the lid member 65 floats due to the first interference portion 668, the exterior body lid 17 also floats. Therefore, the operator can grasp the misplacement of the lid member 65 by recognizing the floating of the exterior body lid 17. That is, even in the power storage device 1 having the exterior body lid 17 that covers the lid member 65, it is possible to suppress the misplacement of the lid member 65.

[0138] The first interference portion 668 of the first divided body 66 and the second interference portion 678 of the second divided body 67 have different positional relationships in plan view. For this reason, when an operator mistakenly houses the second interference portion 678 of the second divided body 67 in the first recess 717 for the first divided body in the bus bar frame 12 during assembly, the second divided body 67 is displaced from the normal position for the first divided body. The same applies when the first interference portion 668 of the first divided body 66 is housed in the second recess 727 for the second divided body. Thereby, the operator can easily recognize that the first divided body 66 and the second divided body 67 have been put in the wrong order.

[0139] The bus bar frame 12 that houses the exhaust member 60 is provided with a pair of third wall portions 716, and first recesses 717 that accommodate the first interference portions 668 are formed in each of the third wall portions 716. In a state where the first interference portion 668 is accommodated 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 lid member 65 is displaced 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, so that it 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 misinserted into the boundary between the first partition wall portion 662 and the third wall portion 716.

[0140] Since the tip of the annular convex portion 665 is in contact with the sealing material 95 over the entire circumference while surrounding the first hole portion 664 and the through hole portion 96, the annular convex portion 665 is in close contact with the sealing material 95 in a state where the sealing material 95 is deformed. Thereby, the sealing performance between the exhaust member 60 and the sealing material 95 can be enhanced. Since the tip of the annular convex portion 665 provided on the exhaust member 60 presses the highly flexible sealing material 95, it can bite into the sealing material 95 with a smaller force compared to the case of pressing the entire surface of the sealing material 95. That is, even if the structure for pressing the sealing material 95 is simplified, high sealing performance can be maintained.

[0141] Since the cross-sectional shape of the tip of the annular convex portion 665 is a tapered shape, it is easy to bite into the sealing material 95 during pressing. Therefore, high sealing performance can be maintained with a smaller force.

[0142] A protruding piece 97 is provided on the inner peripheral edge of the through-hole portion 96. When the sealing material 95 is displaced from its normal position and the arrangement direction and the width direction with the second width W2 are parallel, the width (second width W2) of the through-hole portion 96 based on the arrangement direction is different from the width (first width W1) in the normal position. That is, by measuring the width of the through-hole portion 96 with respect to the arrangement direction, it is possible to determine whether the sealing material 95 is arranged in the normal position. Thereby, misplacement of the sealing material 95 during manufacturing can be detected. If misplacement of the sealing material 95 can be detected, a decrease in sealing performance due to the misplacement can be suppressed.

[0143] Since the regulating recess 112 (regulating portion) for regulating the position of the sealing material 95 is provided in the power storage element 11, displacement of the sealing material 95 can be suppressed by the regulating recess 112. Therefore, displacement between the sealing material 95 and the annular convex portion 665 is also suppressed, and sealing performance can be more reliably exhibited.

[0144] When gas is discharged from the gas discharge valve 111 of one power storage element 11, the gas is discharged to the exhaust path 59 through the through-hole portion 96 and the first hole portion 664. At this time, if the gas that has become hot from the exhaust path 59 reaches another normal power storage element 11, it will have an adverse effect on the normal power storage element 11, which is not preferable. In the present embodiment, since the flange portion 669 is provided inside the annular convex portion 665, this flange portion 669 serves as a barrier, and backflow of gas from the exhaust path 59 to the power storage element 11 can be suppressed.

[0145] In the adjacent portion of the first divided body 66 and the second divided body 67 that form the exhaust portion 50, the overlapping portion 681 provided at one end of the first divided body 66 overlaps the other end of the second divided body 67 in a plan view. By this overlapping portion 681, the gap between the adjacent portions of the first divided body 66 and the second divided body 67 can be narrowed, and gas leakage from the adjacent portions can be suppressed.

[0146] The gap at the adjacent portion between the first partition wall portion 662 and the second partition wall portion 672 is covered by the second wall portion 652 of the lid member 65. In this way, the overlap portion 681 and the lid member 65 can narrow the gap at the adjacent portion between the first divided body 66 and the second divided body 67, and can further suppress gas leakage from the adjacent portion.

[0147] Since the first flange portion 682 is formed at one end portion of the first bottom portion 661 and the second flange portion 692 facing the first flange portion 682 is formed at the other end portion of the second bottom portion 671, the gap at the assembling portion can be narrowed by the overlapping of the first flange portion 682 and the second flange portion 692.

[0148] It is assumed that the first divided body 66 and the second divided body 67 are displaced in the Z-axis direction due to their respective tolerances. In the present embodiment, the first flange portion 682 is formed at one end portion of the first bottom portion 661, and the second flange portion 692 facing the first flange portion 682 is formed at the other end portion of the second bottom portion 671. Therefore, even if the first divided body 66 and the second divided body 67 are displaced in the Z-axis direction, the facing relationship between the first flange portion 682 and the second flange portion 692 can be maintained, and the gap at the assembling portion can be narrowed. Thereby, even if the first divided body 66 and the second divided body 67 are displaced in the Z-axis direction, gas leakage can be suppressed.

[0149] Since the tip of the overlap portion 681 is arranged at an interval S1 from the other end of the second divided body 67, the displacement due to the tolerance can be absorbed by this interval S1. Thereby, the first divided body 66 and the second divided body 67 can be arranged at accurate positions in the longitudinal direction.

[0150] Since the first divided body 66 having the overlap portion 681 is arranged on the exhaust port 51 side and the overlap portion 681 is arranged above the other end of the second divided body 67, the fire entering the power storage element 11 side can be blocked by the overlap portion 681. That is, even if the gas catches fire by any chance, it is possible to suppress the normal power storage element 11 from being burned.

[0151] (Embodiment 2) In the above-described Embodiment 1, the case where a plurality of sealing members 95 are provided in a one-to-one correspondence with each power storage element 11 was exemplified. However, one sealing member may correspond to a plurality of power storage elements 11. In this Embodiment 2, the case where one sealing member 95A corresponds to eight power storage elements 11 will be exemplified. In Embodiment 2, parts equivalent to those in the above-described Embodiment 1 may be denoted by the same reference numerals and the description thereof may be omitted.

[0152] One power storage device 1 is provided with two sealing members 95A of the same type. One of the two sealing members 95A corresponds to the first divided body 66, and the other corresponds to the second divided body 67.

[0153] FIG. 15 is an explanatory diagram showing a schematic configuration of the sealing member 95A according to Embodiment 2. Specifically, FIG. 15(a) is a plan view of the sealing member 95A, and FIG. 15(b) is a side view of the sealing member 95A.

[0154] As shown in FIG. 15, the sealing member 95A is formed in a rectangular plate shape that is long in the Y-axis direction. The sealing member 95A includes a plurality of sealing portions 951a corresponding to each power storage element 11, and a plurality of joint portions 952a connecting the respective sealing portions 951a.

[0155] The seal part 951a is a part placed on the upper wall part 11d of each power storage element 11. The seal part 951a is formed in a rectangular shape in plan view that is long in the Y-axis direction. In the central part of the seal part 951a, a through-hole part 96a communicating with each hole part (first hole part 664, second hole part 674) of the exhaust member 60 is formed. The through-hole part 96a has a shape based on a circle, and one protruding piece 97a protruding in the Y-axis direction is formed on its inner peripheral edge. Each protruding piece 97a protrudes toward the center in the Y-axis direction of the seal material 95A. The effect of the protruding piece 97a is the same as the effect of the protruding piece 97 in Embodiment 1. Each protruding piece 97a reverses the protruding direction with the center in the Y-axis direction as a boundary. Each protruding piece 97a on the plus side in the Y-axis direction from the center protrudes toward the minus side of the Y-axis, and each protruding piece 97a on the minus side in the Y-axis direction from the center protrudes toward the plus side of the Y-axis. Therefore, even when the seal material 95A is rotated 180 degrees, the position of each protruding piece 97a becomes the same as the position before rotation. Thereby, even if the seal material 95A is rotated 180 degrees and arranged, it will not be misassembled, and the arrangement work of the seal material becomes easy. On a pair of seal parts 951a located at both ends of the seal material 95A, protrusions 959a protruding in the X-axis direction are formed on the inner peripheral edge of the through-hole part 96a. The protrusion 959a is a protrusion smaller in size than the protruding piece 97a. Among the pair of seal parts 951a, in one seal part 951a, the protrusion 959a is provided at the end in the minus X-axis direction of the through-hole part 96a, and in the other seal part 951a, the protrusion 959a is provided at the end in the plus X-axis direction of the through-hole part 96a. Thus, the pair of protrusions 959a are arranged in different positional relationships in plan view. When the seal material 95A is regularly arranged on a plurality of power storage elements 11, it is assumed that the pair of protrusions 959a have the above-described positional relationship. Conversely, when the seal material 95A is arranged on a plurality of power storage elements 11 in a turned-over state, the protrusion 959a of one seal part 951a is arranged at the end in the plus X-axis direction of the through-hole part 96a, and the protrusion 959a of the other seal part 951a is arranged at the end in the minus X-axis direction of the through-hole part 96a. That is, the positional relationship of the pair of protrusions 959a is different from the normal case.Therefore, it is possible to easily determine whether or not the sealing material 95A is properly arranged by using a measurement method using image measurement or visual inspection or the like.

[0156] 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 the region between the adjacent seal portions 951 is recessed in a stepped 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. For this reason, the joint portion 952a is more likely to bend than the seal portion 951a. The length of the joint portion 952a in the Y-axis direction is set to be longer than the interval between adjacent power storage elements 11. For this reason, after assembly, the joint portion 952a bends into an arch shape. Due to the stepped shape and the length setting of the joint portion 952a, the peripheral wall forming the regulation recess 112 in the power storage element 11 can be avoided, and the variation in the interval between the power storage elements 11 can be absorbed. For this reason, each seal portion 951a can be installed on each power storage element 11 with good workability.

[0157] The step formed by the regulation recesses 112 (see FIG. 14) of the adjacent power storage elements 11 is accommodated in the step portion 953a. That is, if the sealing material 95A is arranged so that each joint portion 952a straddles each step, it is possible to suppress the seal portion 951a from floating from the power storage element 11 due to the influence of the step, and the space between the gas discharge valve 111 and the exhaust member 60 can be surely sealed.

[0158] Both ends of each joint portion 952a in the X-axis direction are notched to avoid interference with other members. Among the plurality of joint portions 952a, the three (three pairs) joint portions 952a at the central portion in the Y-axis direction are notched to have a longer length in the X-axis direction than the other joint portions 952a. This is to accommodate the positioning protrusions 666 and 676 of the exhaust member 60. The reason for providing three pairs is that with one sealing material 95A, it can be assembled to both the first divided body 66 and the second divided body 67. These three pairs of notches are referred to as assembly notches 954a.

[0159] FIG. 16 is a bottom view showing a state where the sealing material 95A according to Embodiment 2 is assembled to the first divided body 66 and the second divided body 67. As shown in FIG. 16, in the sealing material 95A assembled to the first divided body 66, a plurality of positioning protrusions 666 of the first divided body 66 are accommodated in two pairs of the three pairs of assembly notches 954a in the minus Y-axis direction. In the sealing material 95A assembled to the second divided body 67, a plurality of positioning protrusions 676 of the second divided body 67 are accommodated in two pairs of the three pairs of assembly notches 954a in the plus Y-axis direction. Thus, one sealing material 95A is made common to the first divided body 66 and the second divided body 67.

[0160] Summarizing the above description, the sealing material 95A has a shape of the object to be rotated in a plan view from the Z-axis direction and can be arranged without considering the direction of rotation (180 degrees). Regarding the front-back arrangement, the protrusion 959a enables easy correct / incorrect determination. Thus, the assembly of the power storage device 1 is facilitated.

[0161] As described above, according to the present embodiment, since the adjacent seal portions 951a are connected by the joint portions 952a, the plurality of seal portions 951a are integrated by the joint portions 952a. Therefore, the installation man-hours can be reduced as compared with the case of installing one sealing material for one through-hole portion 96a.

[0162] A joint portion 952a thinner than the seal portion 951a is provided between adjacent seal portions 951a. The thin joint portion 952a is flexible and has elasticity. Thereby, dimensional variations in the intervals between adjacent power storage elements 11 and minute dimensional variations in the actual dimensions of each member can be absorbed. There is no limit to the number of connections that connect adjacent seal portions 951a with the joint portion 952a.

[0163] (Embodiment 3) In the above Embodiment 1, the case where the annular convex portions 665 and 675 are provided on the exhaust member 60 was illustrated. In this Embodiment 3, the case where an annular convex portion is provided on the sealing material will be illustrated. In Embodiment 3, the same parts as those in Embodiment 1 may be denoted by the same reference numerals and the description thereof may be omitted.

[0164] FIG. 17 is a cross-sectional view showing the sealing material 95B according to Embodiment 3 and the members around it. Specifically, FIG. 17 is a figure corresponding to FIG. 5.

[0165] As shown in FIG. 17, the outer bottom surface of the first bottom portion 661b in the first divided body 66b is formed in a flat shape. On the other hand, an annular convex portion 955b protruding toward the first divided body 66b is formed on the upper surface of the sealing material 95B. The annular convex portion 955b is in contact with the outer bottom surface of the first bottom portion 661b with the tip portion surrounding the first hole portion 664 and the through hole portion 96. At the time of contact, the annular convex portion 955b is compressed in the Z-axis direction, but has a longer length in the Z-axis direction than the state shown in FIG. 17 when there is no load.

[0166] Thus, since the annular convex portion 955b is in contact with the first divided body 66b over its entire circumference with its tip portion surrounding the first hole portion 664 and the through hole portion 96, the annular convex portion 955b itself is in close contact with the first divided body 66b in a deformed state. Thereby, the sealing performance between the first divided body 66b and the sealing material 95B can be enhanced. Since the tip portion of the annular convex portion 955b provided on the sealing material 95B is compressed by contacting the first divided body 66b, the contact area can be made smaller compared to the case where the entire sealing material is compressed, and as a result, the annular convex portion 955b can be compressed with a small force. That is, even if the structure for pressing the sealing material 95B is simplified, high sealing performance can be maintained.

[0167] (Embodiment 4) In Embodiment 4, another arrangement example of the first interference portion will be described. Although the first interference portion will be described as an example, the same applies to the second interference portion. In Embodiment 4, parts equivalent to those in Embodiment 1 may be denoted by the same reference numerals and the description thereof may be omitted.

[0168] FIG. 18 is a schematic diagram showing an arrangement example of the first interference portion according to Embodiment 4. Specifically, in FIG. 18(a), Modification 1 according to Embodiment 4 is shown, in FIG. 18(b), Modification 2 according to Embodiment 4 is shown, in FIG. 18(c), Modification 3 according to Embodiment 4 is shown, and in FIG. 18(d), Modification 4 according to Embodiment 4 is shown.

[0169] In the above-described Embodiment 1, the case where the first interference portion 668 is provided at the upper end portion of the first partition wall portion 662 of the first divided body 66 was illustrated. However, as long as the movement of the lid member 65 disposed at an irregular position is blocked, the first interference portion may be provided anywhere within the first partition wall portion 662c. In Modification 1, as shown in FIG. 18(a), the first interference portion 668c is provided at the lower end portion of the first partition wall portion 662c of the first divided body 66c. When the lid member 65 is disposed at a regular position, it fits between the pair of first partition wall portions 662c without interfering with the first interference portion 668c (the solid line portion in FIG. 18(a)). On the other hand, when the lid member 65 is about to be disposed at 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 further movement of the lid member 65 is blocked and the lid member 65 floats (the broken line portion in FIG. 18(a)). As a result, the lid member 65 floats more than when it is disposed at a regular position, so that an operator can grasp the misinsertion of the lid member 65 at a glance.

[0170] In the above-described Embodiment 1, the case where the pair of second wall portions 652 of the lid member 65 are disposed within the pair of first partition wall portions 662 of the first divided body 66 was illustrated. However, the pair of second wall portions 652d may be disposed outside the pair of first partition wall portions 662. In Modification 2, the pair of second wall portions 652d of the lid member 65d are disposed outside the pair of first partition wall portions 662 of the first divided body 66 as a regular position (the solid line portion in FIG. 18(b)). In this state, the pair of second wall portions 652d do not interfere with the first interference portion 668. On the other hand, when the lid member 65d is about to be disposed at an irregular position, the second wall portion 652d of the lid member 65d interferes with the first interference portion 668 in the Z-axis direction, so that further movement of the lid member 65d is blocked and the lid member 65d floats (the broken line portion in FIG. 18(b)). As a result, the lid member 65d floats more than when it is disposed at a regular position, so that an operator can grasp the misinsertion of the lid member 65d at a glance.

[0171] In the above-described Embodiment 1, the case where the first interference portion 668 is provided on the first partition wall portion 662 of the first divided body 66 was exemplified. However, as long as the movement of the lid member 65 disposed at an irregular position is blocked, the installation target of the first interference portion is not limited. In Modification 3, as shown in FIG. 18(c), the first interference portions 668e are provided on a pair of second wall portions 652e of the lid member 65e. Specifically, the first interference portions 668e are on the outer surfaces of the pair of second wall portions 652e and protrude outward from the lower end portions thereof. On the other hand, no first interference portion is provided on the first partition wall portion 662e of the first divided body 66e.

[0172] When the lid member 65e is disposed at a regular position, it fits between the pair of first partition wall portions 662e (solid line portion in FIG. 18(c)). In this state, the pair of first partition wall portions 662e do not interfere with the first interference portions 668e. On the other hand, when the lid member 65e is about to be disposed at an irregular position, the first interference portions 668e of the lid member 65e interfere with the first partition wall portions 662e in the Z-axis direction. For this reason, further movement of the lid member 65e is blocked, and the lid member 65e floats (broken line portion in FIG. 18(c)). As a result, since the lid member 65e floats more than when it is disposed at a regular position, an operator can grasp the misinsertion of the lid member 65e at a glance.

[0173] In the above-described Embodiment 1, the case where the first interference portion 668 is provided in the exhaust path 59 was exemplified. However, as long as the movement of the lid member disposed at an irregular position is blocked, the first interference portion may be provided in the vicinity of the exhaust path. In Modification 4, as shown in FIG. 18(d), the first interference portions 668f are provided on the bus bar frame 12f. Specifically, each of the first interference portions 668f protrudes from the upper end portion of each third wall portion 716f of the bus bar frame 12f toward the exhaust path 59. In this Modification 4, no first interference portion is provided on the first divided body 66f.

[0174] When the lid member 65 is arranged at the normal position, it is accommodated between a pair of first partition wall portions 662f (the solid line portion in Fig. 18(d)). In this state, the pair of first partition wall portions 662f do not interfere with the first interference portion 668f. On the other hand, when the lid member 65 is about to be arranged at an abnormal position, the second wall portion 652 of the lid member 65 interferes with the first interference portion 668f in the Z-axis direction. For this reason, further movement of the lid member 65 is prevented, and the lid member 65 will float (the broken line portion in Fig. 18(d)). As a result, since the lid member 65 floats more than when it is arranged at the normal position, an operator can grasp the misinsertion of the lid member 65 at a glance.

[0175] (Others) As described above, the power storage device 1 according to each embodiment has been described. However, the present invention is not limited to each embodiment. That is, each embodiment disclosed this time is illustrative in all respects and not restrictive. The scope of the present invention is indicated by the claims, and includes all modifications within the meaning and scope equivalent to the claims.

[0176] In the first embodiment, the case where the exhaust member 60 and the bus bar frame 12 are separate members has been exemplified. However, the bus bar frame and the exhaust member may be integrally formed. In this case, the bus bar frame can be called an exhaust member. The bus bar frame may be divided according to the aspect of the exhaust member.

[0177] In the first embodiment, the case where the exhaust member 60 is divided into two has been exemplified. However, the number of divisions may be three or more. In this case, two adjacent divided bodies correspond to the first divided body and the second divided body. The exhaust member 60 may not be divided and may be an integral body as a whole.

[0178] The end wall portion 677 of the second divided body 67 or the front wall portion 659 of the lid member 65 may not be provided. The front wall portion is formed by being bent from one end portion of the lid, and there may be a gap between the front wall portion and the second wall portion. In these cases, misinsertion may occur, and the interference portion is effective for preventing misinsertion.

[0179] In Embodiment 1, the case where four positioning protrusions 666 that contact one power storage element 11 are provided on the first divided body 66 was illustrated. However, the number of positioning protrusions that contact one power storage element 11 may be other than four. The plurality of positioning protrusions may be provided so as to contact a number of power storage elements 11 that is less than the total number of power storage elements 11 corresponding to the first divided body 66.

[0180] In Embodiment 1, the sealing material 95 is formed of rubber, but it may be formed of a foam material such as urethane foam or polyethylene foam.

[0181] In Embodiment 1, the exhaust portion 50 includes the exhaust member 60, the lid member 65, and the sealing material 95. However, depending on the performance of the power storage element 11, the usage environment of the power storage device 1, or the allowable degree of gas discharge, the lid member 65 or the sealing material 95 may not be provided. The exhaust member 60 and the lid member 65 may be integrally formed.

[0182] The configuration disclosed in this specification is suitable for a power storage device 1 that uses a power storage element 11 with a high energy density such as in the embodiment.

[0183] A form constructed by arbitrarily combining the components included in the above embodiment and its modification examples is also included in the scope of the present invention.

Industrial Applicability

[0184] The present invention can be applied to a power storage device or the like including a power storage element such as a lithium ion secondary battery.

Explanation of Signs

[0185] 1 Power storage device 10 Power storage unit 11 Power storage element 11a Container 11b Positive electrode terminal 11c Negative electrode terminal 11d Upper wall portion 11e Spacer 12, 12f Bus bar frame 13 bus bar 13a detection line 13b connector 14 housing body 15 housing support 15a bottom part 15b, 15c, 17b, 17c connection part 15d fixing part 16 substrate unit mounting part 17 housing cover 17a top plate part 18 housing 20 substrate unit 21, 22 cable guide 23 connector for communication cable 30 cable 31 positive power cable 32 negative power cable 50 exhaust part 51 exhaust port 59 exhaust path 60 exhaust member 61 bottom part 62 first wall part 65, 65d, 65e cover member 66, 66b, 66c, 66e first divided body 67 second divided 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 part 97, 97a protruding piece 111 gas discharge valve 112 regulating recess 141 notch part 142 partition wall part 143 side opening 171 opening 651 cover part 652, 652d, 652e second wall part 661, 661b first bottom part 659 front wall part 662, 662c, 662e, 662f First partition wall part 663 First groove 664 First hole part (hole part) 665, 675, 955b Annular convex part 666, 676 Positioning protrusion 666a First positioning protrusion 666b Second positioning protrusion 666c, 666d Corner part 668, 668c, 668e, 668f First interference part (interference part) 669 Flange part 671 Second bottom 672 Second partition wall part 673 Second groove 674 Second hole part (hole part) 677 Terminal wall part 678 Second interference part (interference part) 681 Overlap part 682 First flange part 691 Receiving recess 692 Second flange part 711 First outer wall part 711a, 711b First notch 715 First cable path part 716, 716f Third wall part 717 First recess 721 Second outer wall part 721a Second notch 725 Second cable path part 727 Second recess 731 Beam part 951a Seal part 952a Joint part 953a Step part 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 image

Claims

1. A plurality of power storage elements each having a gas discharge valve, the gas discharge valves being arranged in a posture facing the same direction; An exhaust member disposed on the plurality of power storage elements, forming an exhaust path for the gas discharged from the gas discharge valve; The exhaust member has a plurality of holes communicating with the gas discharge valves of the plurality of power storage elements respectively; The exhaust member protrudes from a position in any one of the arrangement directions of the plurality of power storage elements toward any one of the plurality of power storage elements, and has a positioning protrusion that abuts against the power storage element. A power storage device.

2. A pair of the positioning protrusions are provided at positions sandwiching the power storage element in the arrangement direction of the plurality of power storage elements. The power storage device according to Claim 1.

3. Each of the pair of positioning protrusions has chamfered corner portions facing each other. The power storage device according to Claim 2.

4. The pair of positioning protrusions are arranged in a direction intersecting the arrangement direction of the plurality of power storage elements. The power storage device according to any one of Claims 1 to 3.

5. The positioning protrusion is disposed at the central portion of the exhaust member in the arrangement direction of the plurality of power storage elements. The power storage device according to any one of Claims 1 to 4.

Images