JP2021068559A - Power storage device - Google Patents

Abstract

To provide a power storage device capable of enhancing safety during discharge of gas.SOLUTION: A power storage device 1 includes a plurality of power storage elements 11 each having a gas discharge valve 111, which are arranged so that the gas discharge valves 111 thereof face in the same direction, an exhaust unit 50 which is arranged on each gas discharge valve 111 of the plurality of power storage elements 11 and forms an exhaust path 59 for gas discharged from the gas discharge valve 111, an exterior packaging main body 14 (housing) for accommodating the plurality of power storage elements 11 and the exhaust unit 50, and a fin portion 51 that protrudes from the exterior packaging main body 14 and forms an outlet portion of the exhaust path 59. The fin portion 51 has a first fin 511 that protrudes from the exterior packaging main body 14 in an inclined state.SELECTED DRAWING: Figure 11

Description

The present invention relates to a power storage device.

Conventionally, a plurality of power storage elements (batteries) are housed in a case of a power storage device. The power storage device is provided with an exhaust port (exhaust port) at one end, and the gas released from the power storage element in the event of an abnormality is exhausted from the exhaust port (see, for example, Patent Document 1). ).

Japanese Unexamined Patent Publication No. 2007-27011

Here, it is assumed that another device is arranged in the vicinity of the exhaust port portion of the power storage device. If gas is ejected from the exhaust port of the power storage device in this state, the other device may be exposed to the heated gas, and the other device may burn.

Therefore, an object of the present invention is to provide a power storage device capable of enhancing safety at the time of gas discharge.

In order to achieve the above object, the power storage device according to one aspect of the present invention each has a gas exhaust valve, and a plurality of power storage elements arranged with the gas exhaust valves facing in the same direction and a plurality of power storage devices. An exhaust unit that is arranged on each gas discharge valve of the element and forms an exhaust path for the gas discharged from the gas discharge valve, a housing that accommodates a plurality of power storage elements and an exhaust unit, and a housing that protrudes from the housing and exhausts. It includes a fin portion that forms an exit portion of the path, and the fin portion has a first fin that projects in an inclined state from the housing.

According to this, since the first fin protrudes from the housing in an inclined state, the path of the gas can be controlled by the first fin. Therefore, it is possible to prevent the gas from hitting another device adjacent to the power storage device. In addition, since the first fin acts as a barrier when the gas travels straight, it is possible to reduce the momentum of the gas toward other devices. From these facts, the influence of the gas on the other device can be suppressed, and the combustion of the other device can be suppressed. As a result, safety at the time of gas discharge can be enhanced.

Further, the fin portion may have a plurality of other fins surrounding the outlet portion together with the first fin.

According to this, since the outlet portion of the exhaust path is surrounded by the first fin and the plurality of other fins, the path of the gas can be controlled more reliably. As a result, it is possible to more reliably suppress the contact of gas with other devices, and it is possible to further enhance the safety at the time of gas discharge.

Further, a gap may be provided between at least one adjacent fin formed by each of the first fin and the plurality of other fins.

According to this, since a gap is provided between at least one adjacent fin formed by each of the first fin and the plurality of other fins, gas is also discharged from the gap. As a result, the gas is diffused, so that it is possible to more reliably suppress the gas from hitting other devices. Therefore, the safety at the time of gas discharge can be further enhanced.

Further, a cover member having an opening that covers the housing and projects the fin portion is provided, and the plurality of other fins include a second fin facing the first fin, and the first fin and the second fin in the circumferential direction. The third fin and the fourth fin arranged between the fins are provided, the first fin, the third fin and the fourth fin are provided in the exhaust portion, and the second fin is provided in the cover member. May be good.

According to this, since the first fin, the third fin, and the fourth fin are provided for the exhaust portion and the second fin is provided for the cover member, it is easy to construct a structure in which each fin surrounds the outlet portion. Can be formed into.

Further, since the housing is covered with the cover member, it is possible to prevent the electrolytic solution discharged from the fin portion together with the gas from being applied to the housing, and it is possible to suppress ignition caused by the electrolytic solution. Therefore, the safety at the time of gas discharge can be further enhanced.

Further, the first fin may be arranged above the exhaust path and may be inclined so that the tip thereof faces downward.

According to this, since the first fin is located above the exhaust path and is inclined so that the tip faces downward, the gas can be surely applied to the first fin, which allows the gas to be applied. The course can be controlled reliably. Therefore, the safety at the time of gas discharge can be further enhanced.

Further, since the first fin fits in the exhaust path when the exhaust path is viewed in the traveling direction of the gas, it is possible to suppress the upward increase in size of the power storage device.

Further, since the tip of the first fin is inclined so as to face downward, the gas is easily discharged in the vicinity of the power storage device and easily stays in the rack accommodating the power storage device. Therefore, it is suitable when the gas is not desired to diffuse out of the rack.

The first fin is arranged above the exhaust path and may be inclined so that the tip faces upward.

Here, the gas discharged from the fin portion tends to rise because of its high temperature. Since the first fin is inclined so that the tip faces upward, it is difficult to block the rising gas. Therefore, the gas G can be discharged to a distant place of the power storage device, which is suitable when it is desired to discharge the gas G without staying in the rack.

According to the power storage device of the present invention, safety at the time of gas discharge can be enhanced.

It is a perspective view which shows the appearance of the power storage equipment which concerns on embodiment. It is a perspective view which shows the appearance of the power storage equipment which concerns on embodiment. It is a perspective view which shows the schematic structure of the stopper which concerns on embodiment. It is a perspective view which shows the appearance of the power storage device which concerns on embodiment. It is an exploded perspective view which shows each component when the power storage unit which concerns on embodiment is disassembled. It is an exploded perspective view which shows the schematic structure of the exhaust part and the bus bar frame which concerns on embodiment. It is an exploded perspective view which shows the schematic structure of the exhaust part and the exterior body lid body which concerns on embodiment. It is sectional drawing of one end part on the Y-axis plus direction side of the exhaust part which concerns on embodiment. It is a top view which shows the schematic structure of the one end part on the Y-axis plus direction side of the exhaust part which concerns on embodiment. It is sectional drawing which shows the schematic structure of the exhaust part and the power storage element which concerns on embodiment. It is a side view which shows the schematic structure of the fin part which concerns on embodiment. It is a side view which shows the gas discharged from the exhaust part which is a comparative example. It is a side view which shows the schematic structure of the fin part which concerns on the modification.

Hereinafter, the power storage equipment according to the embodiment of the present invention (including a modification thereof) will be described with reference to the drawings. It should be noted that all of the embodiments described below show comprehensive or specific examples. Numerical values, shapes, materials, components, arrangement positions of components, connection forms, etc. shown in the following embodiments are examples, and are not intended to limit the present invention. Further, in each figure, the dimensions and the like are not exactly shown.

Further, in the following description and drawings, the arrangement direction of a plurality of power storage devices arranged on one shelf board, the arrangement direction of a pair of electrode terminals (positive electrode side and negative electrode side) in one power storage element, and the container of the power storage element. The opposite direction of the short side surface or the opposite direction of the long side surface of the exterior body of the power storage unit is defined as the X-axis direction. The direction in which the front cover and the back cover face each other, the insertion direction in which the power storage device is inserted into the shelf board, the direction in which a plurality of power storage elements are arranged, the direction in which the long side surfaces of the power storage element containers face each other, The opposite direction of the short side surface is defined as the Y-axis direction. The direction in which a plurality of shelves are arranged, the direction in which the exterior support and the lid of the electricity storage unit are arranged, the direction in which the energy storage element and the bus bar are arranged, the direction in which the container body and the lid of the electricity storage element are arranged, or up and down. The direction is defined as the Z-axis direction. These X-axis directions, Y-axis directions, and Z-axis directions are directions that intersect each other (orthogonally in the present embodiment). Depending on the mode of use, the Z-axis direction may not be the vertical direction, but for convenience of explanation, the Z-axis direction will be described below as the vertical direction.

Further, in the following description, for example, 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. Further, in the following, the Y-axis direction may be referred to as a first direction, the X-axis direction may be referred to as a second direction, and the Z-axis direction may be referred to as a third direction. Further, expressions indicating relative directions or postures such as parallel and orthogonal include cases where they are not strictly the directions or postures. For example, the fact that two directions are orthogonal not only means that the two directions are completely orthogonal, but also that they are substantially orthogonal, that is, a difference of, for example, about several percent. It also means to include.

[1 Explanation of the configuration of power storage equipment]
First, the configuration of the power storage equipment 900 in the present embodiment will be described. The power storage facility 900 is a stationary storage battery panel that stores electric power generated by, for example, wind power generation or solar power generation, and stably supplies electric power to external equipment.

1 and 2 are perspective views showing the appearance of the power storage equipment 900 according to the embodiment. FIG. 1 is a perspective view of the power storage equipment 900 as viewed from the front side, and FIG. 2 is a perspective view of the power storage equipment 900 as viewed from the back side.

As shown in FIG. 1, the power storage equipment 900 includes a metal rack 901 and a plurality of power storage devices 1. The rack 901 includes a rack main body 910, a pair of front covers 920, a pair of back covers 930, and a plurality of shelf boards 940. In FIG. 1, of the pair of front covers 920, one of the front covers 920 is not shown. In FIG. 2, of the pair of back covers 930, one of the back covers 930 is not shown. 1 and 2 show a case where a total of three power storage devices 1 are installed on a plurality of shelf boards 940, but the number of power storage devices 1 installed is not limited to this.

The rack body 910 is, for example, a rectangular box made of metal, and openings are provided on the front surface and the back surface thereof. The front opening of the rack body 910 is covered by a pair of front covers 920. The pair of front covers 920 are arranged side by side in the X-axis direction, and are attached to the front portion of the rack main body 910 so as to open and close the opening on the front side of the rack main body 910. The rear opening of the rack body 910 is covered by a pair of back covers 930. The pair of back cover 930s are arranged side by side in the X-axis direction, and are attached to the back of the rack body 910 so as to open and close the opening on the back side of the rack body 910.

Although not shown, an electric circuit unit connected to a plurality of power storage devices 1 is provided in the rack main body 910. The electric circuit unit contains, for example, a molded case circuit breaker (circuit breaker), a control circuit, and the like. The circuit breaker is arranged on the main circuit through which the main current for charging / discharging each power storage device 1 flows, and the control circuit is connected to the substrate unit 20 of each power storage device 1 by a signal line (not shown).

Each of the front cover 920 and each back cover 930 is provided with a plurality of slit groups 925 and 935 for ventilation. Specifically, the plurality of slit groups 925 are arranged in the Z-axis direction on the front cover 920. In one slit group 925, a plurality of slits elongated in the Z-axis direction are arranged along the X-axis direction. The plurality of slit groups 935 are arranged in the Z-axis direction on the back cover 930. In one slit group 935, a plurality of slits elongated in the Z-axis direction are arranged along the X-axis direction. The inside of the rack main body 910 is ventilated by the plurality of slit groups 925 and 935 so that heat is not trapped in the rack main body 910.

[2 shelves]
Inside the rack body 910, a plurality of shelf boards 940 are arranged in the Z-axis direction at predetermined intervals. The shelf board 940 is an example of a support member that supports a plurality of power storage devices 1. Specifically, the shelf board 940 is a plate body parallel to the XY plane, and a plurality of power storage devices 1 can be arranged and placed on one shelf board 940 in the X-axis direction. The slit group 925 faces the end of the power storage device 1 mounted on the shelf plate 940 on the negative direction side of the Y-axis. Similarly, the slit group 935 faces the end of the power storage device 1 mounted on the shelf plate 940 on the Y-axis plus direction side. As a result, the heat released from the power storage device 1 can be smoothly discharged to the outside of the rack 901 from the slit groups 925 and 935.

A stopper 941 projecting upward is integrally provided at the end of the shelf board 940 in the positive direction of the Y-axis.

FIG. 3 is a perspective view showing a schematic configuration of the stopper 941 according to the embodiment. As shown in FIG. 3, the stopper 941 abuts on the end of the power storage device 1 on the Y-axis positive direction side to regulate the movement of the power storage device 1 in the Y-axis positive direction. Specifically, the stopper 941 is a plate body parallel to the XZ plane and elongated in the X-axis direction. A plurality of support hole portions 942 are formed in the stopper 941 at predetermined intervals along the X-axis direction. The support hole portion 942 penetrates the stopper 941 in the Y-axis direction. The support hole portion 942 is a rectangular hole portion elongated in the X-axis direction. One support hole portion 942 corresponds to one power storage device 1. A protruding portion 180 provided at the end of the power storage device 1 on the Y-axis positive direction side is inserted into the support hole portion 942 from the Y-axis negative direction. In the stopper 941, a concave-convex structure 943 that contacts the protruding portion 180 is formed on the peripheral edge of the support hole portion 942.

Specifically, the concave-convex structure 943 is provided on the upper portion of the support hole portion 942 with respect to the edge of the central portion. The uneven structure 943 is formed by alternately and repeatedly arranging a plurality of sets of concave portions 944 and convex portions 945. The concave-convex structure 943 may have at least one concave portion 944 or a convex portion 945. The tip of the convex portion 945 is formed at an acute angle so as to bite into the protruding portion 180. When the tip of the convex portion 945 comes into contact with the protruding portion 180, the movement of the power storage device 1 in the X-axis direction and the Y-axis direction can be restricted. The details of the protrusion 180 will be described later.

[3 Power storage device]
Next, the configuration of the power storage device 1 according to the present embodiment will be described. FIG. 4 is a perspective view showing the appearance of the power storage device 1 according to the embodiment. FIG. 5 is an exploded perspective view showing each component when the power storage unit 10 according to the embodiment is disassembled.

The power storage device 1 is a device capable of charging electricity from the outside and discharging electricity to the outside, and has a substantially rectangular parallelepiped shape in the present embodiment. For example, the power storage device 1 is used for power storage, power supply, and the like. Specifically, the power storage device 1 is used, for example, as a stationary battery or the like used in a power storage facility for home or industry. Further, the power storage device 1 is 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 railroad vehicle for an electric railway, or for starting an engine. And so on. Examples of the above-mentioned vehicle include an electric vehicle (EV), a hybrid electric vehicle (HEV), a plug-in hybrid electric vehicle (PHEV), and a gasoline vehicle. Examples of the railway vehicle for the electric railway include a train, a monorail, and a linear motor car.

As shown in FIGS. 4 and 5, 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 (assembled battery) 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 unit 50, a plurality of bus bars 13, and an exterior body body 14, an exterior body support 15, and an exterior body that accommodate these. It has an exterior body 18 composed of a lid body 17. Further, a cable 30 is connected to the power storage unit 10. The power storage unit 10 may have a restraint member (end plate, side plate, etc.) that restrains the plurality of power storage elements 11.

The power storage element 11 is a secondary battery (cell battery) capable of charging electricity and discharging electricity, and more specifically, a non-aqueous electrolyte secondary battery such as a lithium ion secondary battery. .. The power storage element 11 has a flat rectangular parallelepiped shape (square shape), and in the present embodiment, 16 power storage elements 11 are arranged side by side in the Y-axis direction. The shape, arrangement position, number, and the like of the power storage element 11 are not particularly limited. Further, the power storage element 11 is not limited to the non-aqueous electrolyte secondary battery, and may be a secondary battery other than the non-aqueous electrolyte secondary battery, or may be a capacitor. Further, the power storage element 11 may be a primary battery that can use the stored electricity without being charged by the user, instead of the secondary battery. Further, the power storage element 11 may be a battery using a solid electrolyte. Further, the power storage element 11 may be a laminated type power storage element.

Specifically, the power storage element 11 includes a metal container 11a forming a main body, and a positive electrode terminal 11b and a negative electrode terminal 11c, which are metal electrode terminals, are provided on the lid of the container 11a. That is, the positive electrode terminal 11b and the negative electrode terminal 11c are provided on the upper surface of the main body. A gas discharge valve 111 (see FIG. 10) that discharges gas to release the pressure when the pressure inside the container 11a rises is provided on the lid of the container 11a between the positive electrode terminal 11b and the negative electrode terminal 11c. The plurality of power storage elements 11 are arranged so that their gas discharge valves 111 face the same direction (Z-axis plus direction). Further, a flat plate-shaped spacer 11d having a heat insulating property is arranged between the adjacent power storage elements 11. The lid portion of the container 11a may be provided with a liquid injection portion for injecting the electrolytic solution. Further, an electrode body (also referred to as a power storage element or a power generation element) and a current collector (positive electrode current collector and negative electrode current collector) are arranged inside the container 11a, and an electrolytic solution (non-aqueous electrolyte) or the like is placed. Although it is enclosed, detailed description thereof will be omitted.

Here, the positive electrode terminal 11b and the negative electrode terminal 11c are arranged so as to project upward (Z-axis plus direction) from the lid portion of the container 11a. Then, the outermost positive electrode terminals 11b and negative electrode terminals 11c of the plurality of power storage elements 11 are connected to the cable 30, so that the power storage device 1 charges electricity from the outside and discharges electricity to the outside. be able to.

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

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, for example, 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 is positioned with respect to the plurality of power storage elements 11. Further, a plurality of bus bars 13 are placed and positioned on the bus bar frame 12. As a result, each bus bar 13 is positioned with respect to the plurality of power storage elements 11 and is joined to the positive electrode terminals 11b and the negative electrode terminals 11c of the plurality of power storage elements 11. Details of the bus bar frame 12 will be described later.

The exhaust unit 50 is arranged on the bus bar frame 12 and constitutes an exhaust path 59 (see FIG. 10) of the gas discharged from the gas discharge valve 111 of each power storage element 11. One end of the exhaust portion 50 in the Y-axis positive direction forms a part of the fin portion 51 from which gas is discharged, and protrudes from one end of the exterior body 18 in the Y-axis positive direction. The details of the exhaust unit 50 will be described later.

Each bus bar 13 is a rectangular plate-shaped member arranged on a plurality of power storage elements 11 (on the bus bar frame 12) and electrically connecting the electrode terminals of the plurality of power storage elements 11. The bus bar 13 is made of, for example, 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 16 power storage elements 11 in series by connecting the positive electrode terminals 11b and the negative electrode terminals 11c of the adjacent power storage elements 11. The plurality of bus bars 13 are arranged along the Y-axis direction on the X-axis minus direction side (other side) and the first bus bar group arranged along the Y-axis direction on the X-axis plus direction side (one side). It is divided into the second busbar group. The mode of connection of the power storage element 11 is not limited to the above, and series connection and parallel connection may be combined in any way.

Further, a detection line 13a is connected to the electrode terminal of the bus bar 13 or the power storage element 11. 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 measuring the voltage of the power storage element 11, measuring the temperature, or balancing the voltage between the power storage elements 11. A thermistor (not shown) for measuring the temperature of the power storage element 11 is arranged at the electrode terminal of the bus bar 13 or the power storage element 11, but the description thereof will be omitted. A connector 13b is connected to the end of the detection line 13a in the negative direction of the Y-axis. The connector 13b is a connector 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. Further, the detection line 13a also has a function of discharging the power storage element 11 having a high voltage and balancing the voltage between the power storage elements 11 by controlling the substrate.

The exterior body 18 is a rectangular (box-shaped) module case that constitutes the exterior body of the power storage unit 10. That is, the exterior body 18 is arranged outside the power storage element 11 or the like, fixes the power storage element 11 or the like at a predetermined position, and protects the power storage element 11 or the like from impact or the like. Here, the exterior body 18 is an exterior body body 14 that constitutes the main body of the exterior body 18, an exterior body support 15 that supports the exterior body body 14, and an exterior body that constitutes a lid (outer lid) of the exterior body 18. It has a body lid 17.

The exterior body body 14 is a bottomed rectangular tubular housing having an opening. The exterior body body 14 is formed of, for example, an insulating member such as PC, PP, or PE. The exterior body body 14 accommodates a plurality of power storage elements 11, an exhaust unit 50, a bus bar frame 12, and the like. A notch 141 is formed in the center of the upper portion of the exterior body 14 on the positive side of the Y-axis, through which the exhaust portion 50 penetrates. The notch 141 is a rectangular notch with an open upper part.

The exterior body support 15 and the exterior body lid 17 are members that protect (reinforce) the exterior body 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 galvanized steel sheet. The exterior body support 15 and the exterior body lid 17 may be made of members of the same material, or may be made of members of different materials.

The exterior body support 15 is an example of a second reinforcing member that supports the exterior body body 14 from below (Z-axis minus direction), and is fixed to the bottom portion 15a, the substrate unit mounting portion 16, and the connecting portions 15b and 15c. It has a part 15d. The bottom portion 15a is a flat plate-shaped and rectangular portion extending parallel to the XY plane and extending in the Y-axis direction, which constitutes the bottom portion of the power storage device 1, and is arranged below the exterior body body 14. When the power storage device 1 is installed on the shelf board 940, the lower surface of the bottom portion 15a comes into contact with the upper surface of the shelf board 940. That is, the lower surface of the bottom portion 15a is an installation surface 159 installed on the shelf board 940.

The board unit mounting portion 16 is a flat plate-shaped and rectangular portion erected in the Z-axis plus direction from the end of the bottom portion 15a in the Y-axis minus direction, and the board unit 20 is mounted. The connecting portion 15b is arranged at the end of the substrate unit mounting portion 16 in the positive direction of the Z axis and protrudes in the negative direction of the Y axis, and is connected to the exterior body lid 17. The connecting portion 15c is a portion that is erected in the Z-axis plus direction from the end of the bottom portion 15a in the Y-axis plus direction and protrudes in the Y-axis plus direction, and is connected to the exterior body lid 17. The fixed portion 15d is a flat and rectangular portion erected in the negative direction of the Z axis from the end of the bottom 15a in the negative direction of the Y axis, and is fixed to the end of the shelf board 940 on the negative direction of the Y axis. The end. The fixed portion 15d is arranged at the center of the bottom portion 15a in the X-axis direction. In the present embodiment, screwing is used for fixing the fixing portion 15d and the shelf plate 940, but any fixing method may be used as long as the fixing and the release thereof can be freely performed.

The exterior body lid 17 is an example of a first reinforcing member that covers the upper part of the plurality of power storage elements 11. Specifically, the exterior body lid 17 is a cover member that covers the exterior body body 14 so as to close the opening of the exterior body body 14, and has a top surface portion 17a and connecting portions 17b and 17c. There is. The top surface portion 17a is a flat plate-shaped and rectangular portion extending parallel to the XY plane and extending in the Y-axis direction, which constitutes the upper surface portion of the power storage device 1, and is arranged above the exterior body main body 14. The connecting portion 17b is arranged at the end of the top surface portion 17a in the negative direction of the Y axis and protrudes in the negative direction of the Y axis, and is connected to the connecting portion 15b of the exterior support body 15. The connecting portion 17c is a portion extending in the negative direction of the Z axis from the end of the top surface portion 17a in the positive direction of the Y axis and projecting in the positive direction of the Y axis, and is connected to the connecting portion 15c of the exterior body support 15. .. In this way, the exterior body support 15 and the exterior body lid 17 are connected to the connecting portions 15b and 15c and the connecting portions 17b and 17c by screwing or the like with the exterior body main body 14 sandwiched from above and below. It has a fixed structure. As a result, each member (bus bar frame 12, the plurality of power storage elements 11 and the exhaust portion 50) housed in the exterior body main body 14 is vertically sandwiched by the exterior body support 15 and the exterior body lid 17. .. Further, the connecting portion 15c and the connecting portion 17c connected to each other form a protruding portion 180. The details of the protrusion 180 will be described later.

Further, in the connecting portion 17c of the exterior body lid 17, an opening 171 (see FIG. 7 and the like) through which the exhaust portion 50 penetrates is formed in the center of the upper end portion (the end portion on the Z-axis plus direction side). .. The opening 171 has a plan view shape corresponding to the outer shape of the exhaust portion 50. In the present embodiment, the opening 171 has a rectangular shape in a plan view. One end of the exhaust portion 50 on the Y-axis positive direction side protrudes from the exterior body 18 by penetrating the opening 171 and the notch 141 of the exterior body main body 14.

As shown in FIG. 4, the substrate unit 20 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 of the power storage unit 10 in the minus direction of the Y axis. Specifically, the substrate unit 20 is rotatably attached to the substrate unit mounting portion 16 (see FIG. 5) provided on the exterior body support 15 included in the exterior body 18 of the power storage unit 10.

[4 Busbar frame]
Next, the details of the bus bar frame 12 will be described. FIG. 6 is an exploded perspective view showing a schematic configuration of the exhaust unit 50 and the bus bar frame 12 according to the embodiment. FIG. 6 is a perspective view of the exhaust unit 50 and the bus bar frame 12 as viewed from above.

As shown in FIG. 6, the bus bar frame 12 is an example of a bus bar holding member arranged on a plurality of power storage elements 11 to hold the plurality of bus bars 13. Specifically, the bus bar frame 12 has a first holding portion 71, a second holding portion 72, and a connecting portion 73. Here, among the plurality of detection lines 13a, the plurality of detection lines 13a held by the first holding unit 71 are referred to as first detection lines. Further, among the plurality of detection lines 13a, the plurality of detection lines 13a held by the second holding unit 72 are referred to as a second detection line.

The first holding portion 71 is a portion of the bus bar frame 12 on the plus direction side (one side) of the X axis, and is a portion that holds the first bus bar group and the positive electrode power cable 31. Further, the first holding unit 71 is connected to the electrode terminal (positive electrode terminal 11b or negative electrode terminal 11c) in the positive direction of the X axis in each power storage element 11 or a plurality of first detections connected to the bus bar 13 included in the first bus bar group. It also holds the line.

The first holding portion 71 is arranged in the X-axis plus 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 surrounding the outer periphery of the first holding portion 71, and a first surrounding wall 712 surrounding each bus bar 13 together with the first outer wall portion 711.

A pair of first completely missing 711a and 711b are formed at the end of the first outer wall portion 711 in the minus direction of the Y axis. A positive electrode power cable 31 and a plurality of first detection lines are arranged so as to penetrate through one of the pair of completely missing 711a and 711b, the first completely missing 711a. Further, the negative electrode power cable 32 is arranged so as to penetrate through the other completely missing 711b.

The first surrounding wall 712 is arranged in the first outer wall portion 711 on the plus direction side of the X axis, and is provided long in the Y axis direction. The end of the first surrounding wall 712 in the Y-axis plus direction is arranged between the power storage element 11 at the end in the Y-axis plus direction and the power storage element 11 adjacent thereto. The end portion of the first surrounding wall 712 in the negative direction on the Y-axis extends to the vicinity of the first completely missing 711a of the first outer wall portion 711.

In the first surrounding wall 712, a plurality of first partition walls 713 arranged between the bus bars 13 and a plurality of first partition portions 714 arranged between the power storage elements 11 are provided. The first partition wall 713 has a flat plate shape parallel to the XZ plane, and its upper end surface is flush with the upper end surface of the first outer wall portion 711. The first partition portion 714 is a portion elongated in the X-axis direction, and is lower in height than the first partition wall 713. Each bus bar 13 is arranged so as to straddle the corresponding first partition portion 714.

In the first outer wall portion 711, the region in the minus direction of the X axis with respect to the first surrounding wall 712 is the first cable path portion 715 penetrating along the Y axis direction. The first cable path portion 715 is arranged between the gas discharge valve 111 of each power storage element 11 and each bus bar 13 included in the first bus bar group. As described above, the first cable path portion 715 is arranged in the bus bar frame 12 inward in the X-axis direction with respect to the first bus bar group.

A positive electrode power cable 31 and a plurality of first detection lines are arranged in the first cable path portion 715. The first cable path portion 715 forms a path for the positive electrode power cable 31 and a plurality of first detection lines. By arranging the plurality of first detection lines and the positive electrode power cable 31 in the first cable path portion 715, the plurality of first detection lines and the positive electrode power cable 31 are avoided between the first holding portion 71 and the second holding portion 72, that is, on the connecting portion 73. Is arranged.

The second holding portion 72 is a portion of the bus bar frame 12 on the minus direction side (other side) of the X axis. A plurality of second holding portions 72 are connected to the second bus bar group and the electrode terminals (positive electrode terminal 11b or negative electrode terminal 11c) in the negative direction of the X axis in each storage element 11 or the bus bars 13 included in the second bus bar group. Holds the second detection line of.

The second holding portion 72 is arranged in the minus direction of the X-axis with respect to 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, and a second surrounding wall 722 that surrounds each bus bar 13 together with the second outer wall portion 721.

A second notch 721a is formed at the end of the second outer wall portion 721 in the minus direction of the Y axis. A plurality of second detection lines are arranged so as to penetrate through the second notch 721a.

The second surrounding wall 722 is arranged in the second outer wall portion 721 on the minus direction side of the X axis, and is provided long in the Y axis direction. The end of the second wall 722 in the Y-axis plus direction is continuous with the end of the second outer wall portion 721 in the Y-axis plus direction. Further, the end portion of the second surrounding wall 722 in the negative direction on the Y-axis extends to the vicinity of the second notch 721a of the second outer wall portion 721.

In the region on the negative side of the X-axis of the second surrounding wall 722, a plurality of second partition walls 723 arranged between the bus bars 13 and a plurality of second partition portions 724 arranged between the power storage elements 11 are provided. And are provided. The second partition wall 723 has a flat plate shape parallel to the XZ plane, and its upper end surface is flush with the upper end surface of the second outer wall portion 721. The second partition portion 724 is a portion elongated in the X-axis direction, and is lower in height than the second partition wall 723. Each bus bar 13 is arranged so as to straddle the corresponding second partition portion 724.

In the second outer wall portion 721, the region on the X-axis plus direction side with respect to the second surrounding wall 722 is the second cable path portion 725 penetrating along the Y-axis direction. The second cable path portion 725 is arranged between the gas discharge valve 111 of each power storage element 11 and each bus bar 13 included in the second bus bar group. As described above, the second cable path portion 725 is arranged in the bus bar frame 12 inward in the X-axis direction with respect to the second bus bar group.

A plurality of second detection lines are arranged in the second cable path portion 725. The plurality of second detection lines are arranged in the second cable path portion 725 so as to avoid between the first holding portion 71 and the second holding portion 72, that is, on the connecting portion 73. ..

As shown in FIG. 6, the connecting portion 73 is a portion that connects the first holding portion 71 and the second holding portion 72. Specifically, the connecting portion 73 has a plurality of beam portions 731 that are elongated in the X-axis direction, one end of which is connected to the first holding portion 71 and the other end of which is connected to the second holding portion 72. ing. The plurality of beam portions 731 are arranged at predetermined intervals in the Y-axis direction. Exhaust portions 50 are arranged on the plurality of beam portions 731. Of the plurality of beam portions 731, the beam portion 731 at the end in the minus direction of the Y axis is arranged outside the power storage element 11 at the end in the minus direction of the Y axis. Further, the beam portion 731 at the end in the positive direction of the Y-axis is arranged outside the power storage element 11 at the end in the positive direction of the Y-axis. The beam portions 731 other than these are arranged between a pair of adjacent power storage elements 11. In this way, the plurality of beam portions 731 are arranged 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 exposed from the plurality of beam portions 731 in a top view.

[5 Exhaust section]
FIG. 7 is an exploded perspective view showing a schematic configuration of the exhaust portion 50 and the exterior body lid 17 according to the embodiment. Specifically, FIG. 7 is a perspective view of the exhaust portion 50 and the exterior body lid 17 as viewed from below. FIG. 8 is a cross-sectional view of one end of the exhaust unit 50 on the Y-axis plus direction side according to the embodiment. FIG. 9 is a plan view showing a schematic configuration of one end of the exhaust unit 50 on the Y-axis plus direction side according to the embodiment. FIG. 10 is a cross-sectional view showing a schematic configuration of the exhaust unit 50 and the power storage element 11 according to the embodiment.

As shown in FIGS. 6 to 10, the exhaust unit 50 includes an exhaust member 60 and a lid member 65. The exhaust member 60 is arranged directly above the gas discharge valve 111 of each power storage element 11 in a state of being supported by the bus bar frame 12 as a whole. The exhaust member 60 is formed in a U shape with the upper side open in the Y-axis direction, and is a resin member elongated in the Y-axis direction. The length of the exhaust member 60 in the Y-axis direction is a length corresponding to the total length of the exterior body body 14 in the Y-axis direction. Therefore, the entire exhaust member 60 can be housed in the exterior body body 14.

At the bottom of the exhaust member 60, a pair of wall portions 601 are provided on the upper surfaces of both ends in the X-axis direction. Each wall portion 601 is formed parallel to the YZ plane. On the upper surface of the bottom portion, a groove 602 extending along the Y-axis direction is formed in the vicinity of each wall portion 601. In each groove 602, each wall portion 652 of the lid member 65 is arranged.

Further, at the bottom of the exhaust member 60, at the center in the X-axis direction, a plurality of holes 61 for exposing the gas discharge valve 111 of each power storage element 11 are formed. On the outer bottom surface of the exhaust member 60, a plurality of contact portions 62 protruding so as to continuously surround the entire circumference of each hole portion 61 are provided. A flat plate-shaped elastic body 621 such as rubber is laminated on the lower surface of each contact portion 62. Each contact portion 62 has a substantially rectangular outer shape in a plan view. The contact portions 62 are arranged at predetermined intervals in the Y-axis direction, and groove portions 63 extending in the X-axis direction are formed between the contact portions 62. By forming the groove portion 63, each contact portion 62 can be partitioned, and a convex contact portion 62 can be easily formed.

As shown in FIG. 10, the contact portion 62 is a convex portion protruding toward the power storage element 11, and its front end surface (lower end surface) is in contact with the lid portion of the container 11a of the power storage element 11. Specifically, the contact portion 62 is in close contact with the lid portion of the container 11a in a state where the elastic body 621 is compressed. The contact portion 62 surrounds the entire circumference of the gas discharge valve 111 provided in the lid portion, and the elastic body 621 seals the boundary between the gas discharge valve 111 and the hole portion 61. The hole 61 is formed longer than the gas discharge valve 111 in the arrangement direction (X-axis direction) of the plurality of electrode terminals (positive electrode terminal 11b and negative electrode terminal 11c) provided in the power storage element 11.

Here, the size of the power storage element 11 in the Y-axis direction is smaller than the size in the X-axis direction. That is, it is difficult to increase the size of the hole 61 in the Y-axis direction. On the other hand, in the X-axis direction, the hole 61 is easily made larger than the gas discharge valve 111. As a result, when the gas discharge valve 111 is opened, it is possible to prevent the hole 61 from blocking the opening, and smooth gas discharge is possible. If the hole 61 has a shape larger than that of the gas discharge valve 111 as a whole, smoother gas discharge is possible.

Further, the peripheral edge of the hole 61 on the Z-axis plus direction side is an annular portion 64 protruding toward the lid member 65 side over the entire circumference. The annular portion 64 is continuous over the entire circumference. The annular portion 64 not only reinforces the peripheral edge of the hole 61, but also prevents the entire peripheral edge of the hole 61 from melting even when exposed to a high-temperature gas.

The exhaust member 60 may be made of a resin having a higher heat resistance than the bus bar frame 12. For example, when the bus bar frame 12 is made of PP, the exhaust member 60 may be made of polyphenylene sulfide (PPS), which has higher heat resistance than PP. Here, when the bus bar frame and the exhaust member are integrally molded with a single resin, it is necessary to mold all of them with a resin having high heat resistance, but in the present embodiment, it is different from the bus bar frame 12. Since only the exhaust member 60 of the body needs to be formed of a resin having high heat resistance, the amount of the resin used can be suppressed.

As shown in FIGS. 6 to 10, the lid member 65 is arranged above the exhaust member 60 and closes the open portion of the exhaust member 60. 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 side open in the Y-axis direction, and is a long member in the Y-axis direction.

The lid member 65 includes a top plate portion 651 and a pair of wall portions 652. The top plate portion 651 is a long rectangular plate portion parallel to the XY plane. The pair of wall portions 652 are provided on the lower surfaces of both end portions of the top plate portion 651 in the X-axis direction. Each wall portion 652 is formed parallel to the YZ plane. As shown in FIG. 10, the lower end of each wall portion 652 is in contact with the bottom surface of the groove 602 of the exhaust member 60. In this way, since the lower end of each wall portion 652 is in contact with the bottom surface of the groove 602 in a state of being housed in the groove 602, even when the lower end of each wall portion 652 is in contact with a flat surface, The airtightness between each wall portion 652 and the exhaust member 60 can be improved. In this state, the top plate portion 651 of the lid member 65 is arranged above the pair of wall portions 601 of the exhaust member 60. Therefore, the top plate portion 651 of the lid member 65 is pressed downward by the top surface portion 17a of the exterior body lid body 17. By this pressing force, the pair of wall portions 652 of the lid member 65 are pressed against the bottom surface of the groove 602, so that higher airtightness can be exhibited. Further, 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, it is possible to suppress the floating of the lid member 65 due to the discharge of gas.

Further, since a downward pressing force is also applied to the exhaust member 60 from the pair of wall portions 652 of the lid member 65, the exhaust member 60 presses the plurality of power storage elements 11 downward. As a result, the elastic body 621 of the exhaust member 60 can be reliably compressed, and higher adhesion can be exhibited. Further, it is also possible to suppress the vertical positional deviation of the plurality of power storage elements 11 by this pressing force.

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, one end of the lid member 65 on the positive side of the Y-axis can be projected from the exhaust member 60.

One end of the lid member 65 in the positive direction of the Y-axis is open downward and the tip surface in a state of protruding from the exhaust member 60. On the other hand, the other end of the lid member 65 is closed to prevent gas discharge. The lid member 65 constitutes a gas exhaust path 59 together with the exhaust member 60 in a state of being housed in the exhaust member 60. Gas is discharged from the open portion at one end of the lid member 65 described above. Further, one end of the lid member 65 forms a part of the fin portion 51.

The fin portion 51 protrudes from the end portion of the exterior body body 14 on the positive side in the Y-axis direction and forms an outlet portion of the exhaust path 59. Specifically, the fin portion 51 has a first fin 511, a second fin 512, a third fin 513, and a fourth fin 514. The first fin 511, the third fin 513, and the fourth fin 514 are provided on the lid member 65, and the second fin 512 is provided on the exterior body lid 17. The first fin 511 and the other fins (second fin 512, third fin 513, and fourth fin 514) are arranged so as to surround the outlet portion of the exhaust path 59. That is, the first fin 511, the second fin 512, the third fin 513, and the fourth fin 514 are arranged along the circumferential direction of the exhaust path 59. The first fin 511, the second fin 512, the third fin 513, and the fourth fin 514 maintain the same posture before and after the gas discharge valve 111 is opened.

The details of each fin will be described below.

The first fin 511 is one end of the top plate portion 651 of the lid member 65 on the Y-axis plus direction side, and is a portion of the top plate portion 651 that protrudes outward from the opening 171 of the exterior body lid 17. The first fin 511 protrudes from the exterior body body 14 in an inclined state. Specifically, the first fin 511 is formed in the shape of a rectangular flat plate elongated in the X-axis direction, and is inclined with respect to the traveling direction of the gas (Y-axis direction). The first fin 511 is arranged in the upper part of the exhaust path 59 and is inclined downward. The angle formed by the first fin 511 and the Y-axis direction on the acute angle side is within the range of 30 degrees or more and 60 degrees or less. In the present embodiment, the angle formed by the first fin 511 and the Y-axis direction on the acute angle side is approximately 45 degrees. The first fin 511 is formed in a size that fits within the exhaust path 59 when viewed in the Y-axis direction. The first fin 511 has a size that overlaps with more than half of the exhaust path 59 in the Y-axis direction. Therefore, the first fin 511 acts as a barrier against most of the gas discharged from the exhaust path 59.

The second fin 512 projects outward from the lower edge of the opening 171 of the exterior body lid 17. Specifically, the second fin 512 is formed in the shape of a rectangular flat plate elongated in the X-axis direction, and projects from the lower edge of the opening 171 toward the Y-axis plus direction. The second fin 512 is arranged so as to face the first fin 511 in the Z-axis direction. Here, the case where the protruding length of the second fin 512 in the Y-axis direction is shorter than the protruding length of the first fin 511 is illustrated, but it may be the same or more. The second fin 512 is a portion cut up when forming the opening 171 with respect to the connecting portion 17c of the exterior body lid 17. The second fin 512 protrudes from the connecting portion 17c in an inclined state. The second fin 512 is arranged at the lower part of the exhaust path 59 and is inclined downward. The angle formed by the second fin 512 and the Y-axis direction on the acute angle side is within the range of 30 degrees or more and 60 degrees or less. In the present embodiment, the angle formed by the second fin 512 and the Y-axis direction on the acute angle side is approximately 45 degrees. That is, the second fin 512 is arranged parallel to the first fin 511. The second fin 512 may be non-parallel to the first fin 511.

The third fin 513 is provided on the wall portion 652 on the minus direction side of the X-axis of the pair of wall portions 652 of the lid member 65. The fourth fin 514 is provided on the wall portion 652 on the X-axis plus direction side of the pair of wall portions 652 of the lid member 65. The third fin 513 and the fourth fin 514 are arranged so as to face each other in the X-axis direction. The third fin 513 and the fourth fin 514 have the same structure except that the installation locations are different. Therefore, here, the details of the third fin 513 will be described, and the description of the fourth fin 514 will be omitted.

The third fin 513 is one end on the Y-axis plus direction side of the wall portion 652 on the X-axis minus direction side, and has a flat plate shape protruding outward from the opening 171 of the exterior body lid 17 on the wall portion 652. It is a part. The third fin 513 projects parallel to the Y-axis direction. The third fin 513 is arranged between the first fin 511 and the second fin 512 in the circumferential direction of the exhaust path 59. The protruding length of the third fin 513 in the Y-axis direction is about the same as the protruding length of the first fin 511. The third fin 513 has a tapered shape that tapers toward the plus side of the Y-axis. Specifically, the third fin 513 is formed in a shape that does not overlap the first fin 511 and the second fin 512 in the X-axis direction.

As described above, since the third fin 513 does not overlap the first fin 511 and the second fin 512, a gap S1 is formed between the first fin 511 and the third fin 513, and the second fin S1 is formed. A gap S2 is formed between the fins 512 and the third fins 513. In the present embodiment, the case where the third fin 513 is formed in a trapezoidal shape in the X-axis direction is illustrated, but any shape may be used as long as the gaps S1 and S2 are formed. As described above, since the fourth fin 514 has the same structure as the third fin 513, a gap S3 is formed between the first fin 511 and the fourth fin 514, and the second fin 512 and the fourth fin 514 have the same structure. A gap S4 is formed between the four fins 514 and the adjacent fins. The gaps S1 to S4 are continuously provided over the entire length of the fin portion 51. Specifically, as shown in FIG. 8, the gaps S1 and S3 are gaps extending with an uniform width as a whole. The gaps S2 and S4 are gaps that gradually widen toward the positive side of the Y-axis.

FIG. 11 is a side view showing a schematic configuration of the fin portion 51 according to the embodiment. In FIG. 11, the fin portion 51, the shelf plate 940, and the back cover 930 are shown in a cross-sectional view.

The fin portion 51 projects outward from the ends of the bus bar frame 12 and the exterior body 18 in the positive direction of the Y axis. Further, the fin portion 51 projects outward from the end portion of the shelf plate 940 in the positive direction of the Y axis.

The gas discharged from the gas discharge valve 111 of each power storage element 11 enters the exhaust path 59 formed by the exhaust member 60 and the lid member 65 through the hole 61 of the exhaust member 60. After that, the gas passes through the exhaust path 59 and is discharged to the outside of the power storage unit 10 from the fin portion 51 on the outside of the exterior body 18. As described above, in the fin portion 51, the first fin 511, the second fin 512, the third fin 513, and the fourth fin 514 surround the outlet portion of the exhaust path 59. Therefore, the first fin 511, the second fin 512, the third fin 513, and the fourth fin 514 control the path of the gas that has passed through the exhaust path 59. In particular, the first fin 511 changes the traveling direction of the gas downward because it serves as a barrier when the gas travels straight.

In FIG. 11, reference numerals G1 are attached to the gas whose traveling direction has been changed in the fin portion 51. Since the traveling direction of the gas G1 is changed by hitting the first fin 511, the momentum of the gas G1 is reduced at the time of contact with the gas G1. Further, in the gas G1, the distance to reach the slit group 935 is longer than that in the case where the traveling direction remains straight. This also reduces the momentum of the gas G1. Here, if the angle formed by the first fin 511 and the Y-axis direction on the acute angle side is less than 30 degrees, the distance to the slit group 935 in the gas G1 cannot be increased so much. On the other hand, if the angle formed by the first fin 511 and the Y-axis direction on the acute angle side is larger than 60 degrees, the first fin 511 may block the exhaust path 59 and hinder smooth exhaust. Therefore, as described above, the angle formed by the first fin 511 and the Y-axis direction on the acute angle side is within the range of 30 degrees or more and 60 degrees or less.

In addition, gas leaks from the gaps S1 to S4. In FIG. 11, a reference numeral G11 is attached to the gas leaking from the gap S1, and a reference numeral G12 is attached to the gas leaking from the gap S2. In this way, since the gases G11 and G12 are discharged from the gaps S1 to S4 and diffused, the momentum of the gas G1 is further reduced.

Here, FIG. 12 is a side view showing the gas G2 discharged from the exhaust unit 50b, which is a comparative example. FIG. 12 is a diagram corresponding to FIG. The exhaust unit 50b of the comparative example is different from the exhaust unit 50 according to the present embodiment in that one end in the positive direction of the Y-axis is tubular. Therefore, the gas G2 is vigorously ejected from one end of the exhaust portion 50b. Due to this momentum, the gas G2 hits other devices (equipment such as other power storage equipment) in the vicinity of the power storage equipment 900 from the slit group 935 of the back cover 930. As a result, the gas G2 may affect other devices.

On the other hand, as shown in FIG. 11, in the fin portion 51 according to the present embodiment, the gas G1 having reduced momentum is discharged from the slit group 935. Therefore, it becomes difficult for the gas G1 to reach the other device, and the influence on the other device can be suppressed.

[6 Protruding part]
Next, the details of the protrusion 180 will be described. As shown in FIGS. 3, 9 and 11, the projecting portion 180 is an example of an eaves portion projecting from one end surface 99 in the Y-axis plus direction in the power storage device 1 in the Y-axis plus direction. As described above, the protruding portion 180 is a portion formed by connecting the connecting portion 15c of the exterior body support 15 and the connecting portion 17c of the exterior body lid 17. The connecting portion 15c and the connecting portion 17c are fastened with screws 181 in a state of being laminated in the vertical direction. Specifically, the connecting portion 15c and the connecting portion 17c are parallel to the XY plane and have a rectangular plate-shaped portion elongated in the X-axis direction. An elastic body 151 made of rubber, for example, is attached to the upper surface of the connecting portion 17c. The elastic body 151 is arranged at a position corresponding to the uneven structure 943 of the shelf board 940. The elastic body 151 is a member having a triangular columnar shape that is long in the X-axis direction. The elastic body 151 is arranged so as to taper on the connecting portion 17c. That is, the elastic body 151 has an inclined surface 151a that approaches the upper surface of the connecting portion 17c as it goes in the positive direction of the Y-axis. As a result, the protruding portion 180 has a tapered shape that becomes thinner in the thickness direction (Z-axis direction) toward the tip. For example, when the power storage device 1 is set on the shelf board 940, the power storage device 1 is slid on the shelf board 940 from the Y-axis minus direction side with respect to the support hole portion 942, so that the protrusion 180 Is inserted into the support hole 942. If the protruding portion 180 has a tapered shape, it is smoothly inserted into the support hole portion 942, so that the operability at the time of insertion is improved.

Further, the elastic body 151 is provided in a range longer in the X-axis direction than the concave-convex structure 943. As a result, when the protruding portion 180 is inserted into the support hole portion 942 of the shelf plate 940, the entire concave-convex structure 943 meshes with the elastic body 151.

Here, the electrolytic solution may be discharged from the gas discharge valve 111 of the power storage element 11, or the discharged gas may be cooled in the exhaust path 59 to return to the electrolytic solution. That is, as shown in FIG. 11, the electrolytic solution L may fall from the fin portion 51. In particular, since the fin portion 51 is tilted downward, the electrolytic solution L dropped from the fin portion 51 easily reaches the protruding portion 180.

Since the protruding portion 180 is arranged between the installation surface 159 of the power storage device 1 and the fin portion 51, the electrolytic solution L dropped from the fin portion 51 can be received. Specifically, since the elastic body 151 provided in the protruding portion 180 is arranged below the fin portion 51, the inclined surface 151a of the elastic body 151 receives the electrolytic solution L. The electrolytic solution L is guided in the Y-axis plus direction by the inclined surface 151a of the elastic body 151. As a result, the heated electrolytic solution L is separated from the one end surface 99 of the power storage device 1.

Further, depending on the situation, it is assumed that the electrolytic solution L flows on the protrusion 180 in the negative direction of the Y-axis. However, since the protruding portion 180 is formed by the connecting portion 17c of the exterior body lid 17 that covers the upper part of the power storage element 11, electrolysis is performed on the protruding portion 180 toward the Y-axis minus direction side (storage element 11 side). Even if the liquid L flows, the exterior body lid 17 itself becomes a wall, and further progress can be suppressed. Even if the electrolytic solution L comes into contact with the exterior body lid 17, the electrolytic solution L does not proceed to the members (power storage element 11, exterior body 14, etc.) inside the exterior lid 17.

Further, as shown in FIG. 9, when the one end surface 99 of the power storage device 1 is viewed in a plan view, the protrusion 180 is arranged below the center P when the center P of the one end surface 99 is used as a reference. The fin portion 51 is arranged above the center P. In this way, since the fin portion 51 is arranged on the upper portion of the one end surface 99 and the protruding portion 180 is arranged on the lower portion, the falling path of the electrolytic solution L from the fin portion 51 to the protruding portion 180 is lengthened. can do. Therefore, the time that the electrolytic solution L is in contact with air can be lengthened, and the electrolytic solution L can be cooled as much as possible. As a result, the temperature at which the electrolytic solution L touches the protruding portion 180 can be lowered, and the thermal deformation of the protruding portion 180 can be suppressed.

[7 Explanation of effect]
As described above, according to the power storage device 1 according to the present embodiment, there are a plurality of power storage elements 11 each having a gas discharge valve 111 and the gas discharge valves 111 arranged in the same direction. An exhaust unit 50 arranged on each gas discharge valve 111 of the power storage element 11 and forming an exhaust path 59 of the gas discharged from the gas discharge valve 111, and an exterior accommodating a plurality of power storage elements 11 and the exhaust unit 50. A first fin that includes a body body 14 (housing) and a fin portion 51 that protrudes from the exterior body body 14 and forms an outlet portion of an exhaust path 59, and the fin portion 51 protrudes from the exterior body body 14 in an inclined state. It has 511.

According to this, since the first fin 511 protrudes from the exterior body body 14 in an inclined state, the course of the gas G1 can be controlled by the first fin 511. Therefore, it is possible to prevent the gas G1 from hitting another device adjacent to the power storage device 1. Further, since the first fin 511 serves as a barrier when the gas travels straight, the momentum of the gas G1 toward another device can be reduced. From these facts, the influence of the gas G1 on other devices can be suppressed, and the combustion of the other devices can be suppressed. As a result, safety at the time of gas discharge can be enhanced.

Further, the fin portion 51 has a plurality of other fins (second fin 512, third fin 513, and fourth fin 514) surrounding the outlet portion of the exhaust path 59 together with the first fin 511.

According to this, since the outlet portion of the exhaust path 59 is surrounded by the first fin 511 and the plurality of other fins, the course of the gas G1 can be controlled more reliably. As a result, it is possible to more reliably suppress the contact of the gas G1 with other devices, and it is possible to further enhance the safety at the time of gas discharge.

Further, gaps S1 to S4 are provided between at least one adjacency formed by each of the first fin 511 and the plurality of other fins.

According to this, since the gaps S1 to S4 are provided between at least one adjacency formed by each of the first fin 511 and the plurality of other fins, the gases G11 and G12 are also provided from the gaps S1 to S4. It is discharged. As a result, the gases G11 and G12 are diffused, so that the gas G11 and G12 can be more reliably suppressed from hitting other devices. Further, since the momentum of the gas G1 is also reduced, it is possible to more reliably suppress the gas G1 from hitting another device. The safety at the time of gas discharge can be further enhanced.

Further, the power storage device 1 includes an exterior body lid 17 (cover member) having an opening 171 for projecting the fin portion 51 while covering the exterior body main body 14, and a plurality of other fins are attached to the first fin 511. It is provided with a second fin 512 facing each other and a third fin 513 and a fourth fin 514 arranged between the first fin 511 and the second fin 512 in the circumferential direction, and the first fin 511, the third fin 513, and the first fin 514 are provided. The four fins 514 are provided in the exhaust portion 50, and the second fins 512 are provided in the exterior body lid 17.

According to this, since the first fin 511, the third fin 513, and the fourth fin 514 are provided for the exhaust portion 50, and the second fin 512 is provided for the exterior body lid 17, each fin is provided. A structure surrounding the outlet portion can be easily formed with.

Further, since the exterior body body 14 is covered with the exterior body lid 17, it is possible to prevent the electrolytic solution L discharged together with the gas from the fin portion 51 from being applied to the exterior body body 14, and the electrolytic solution L is the cause. Ignition can be suppressed. Therefore, the safety at the time of gas discharge can be further enhanced.

Further, the first fin 511 is arranged above the exhaust path 59 and is inclined so that the tip thereof faces downward.

According to this, since the first fin 511 is arranged above the exhaust path 59 and is inclined so that the tip faces downward, gas can be reliably applied to the first fin 511. This makes it possible to reliably control the course of the gas. Therefore, the safety at the time of gas discharge can be further enhanced.

Further, since the tip of the first fin 411 is inclined so as to face downward, the gas is easily discharged in the vicinity of the power storage device 1 and easily stays in the rack 901. Therefore, it is suitable when it is not desired to diffuse the gas to the outside of the rack 901.

Further, since the first fin 511 fits in the exhaust path 59 when the exhaust path 59 is viewed in the traveling direction of the gas, it is possible to suppress the upward increase in size of the power storage device 1.

[8 Others]
Although the power storage device 1 according to the present embodiment has been described above, the present invention is not limited to the above embodiment. That is, it should be considered that the embodiments disclosed this time are exemplary in all respects and not restrictive. The scope of the present invention is shown not by the above description but by the scope of claims, and is intended to include all modifications within the meaning and scope equivalent to the scope of claims.

For example, in the above embodiment, the case where the fin portion 51 has the first fins 511 to the fourth fins 514 is illustrated. However, the fin portion may include at least the first fin. Therefore, the total number of fins provided in the fin portion may be at least one.

In the above embodiment, the case where the gaps S1 to S4 are provided between the adjacent portions of the first fins 511 to the fourth fins 514 is illustrated, but it is sufficient that the gaps are provided between at least one adjacent portion. Further, there may be no gap between each adjacent portion.

In the above embodiment, the first fin 511, the third fin 513, and the fourth fin 514 are integrally molded with the lid member 65 of the exhaust portion 50, and the second fin 512 is integrally molded with the exterior body lid 17. The case where there is is illustrated. However, each fin may be installed at any location, and each fin may be retrofitted separately from the lid member or the exterior body lid.

In the above embodiment, the case where the first fin 511 is arranged above the exhaust path 59 and the tip is inclined so as to face downward is illustrated. However, as long as the first fin is arranged in an inclined state in the exhaust path, the installation location and the inclination direction of the first fin may be arbitrary. For example, the first fins may be located below the exhaust path and tilted so that the tips point upwards. Further, the first fin may be arranged on one side in the X-axis direction in the exhaust path and may be inclined so that the tip thereof faces the other side.

FIG. 13 is a side view showing a schematic configuration of a fin portion according to a modified example. Specifically, FIG. 13 is a diagram corresponding to FIG. As shown in FIG. 13, the fin portion 51a according to the modified example includes a first fin 511a, a second fin 512a, a third fin 513a, and a fourth fin (not shown). The first fin 511a is arranged above the exhaust path 59 and is inclined so that the tip thereof faces upward. Further, the second fin 512a is arranged below the exhaust path 59 and is inclined so that the tip thereof faces upward. The third fin 513a and the fourth fin are formed in a shape that forms a gap S1 with respect to the first fin 511a and a gap S2 with respect to the second fin 512a. Note that in FIG. 13, the gas leaking from the gaps S1 and S2 is not shown.

In the fin portion 51a, the first fin 511a, the second fin 512a, the third fin 513a, and the fourth fin surround the outlet portion of the exhaust path 59. Therefore, the first fin 511a, the second fin 512a, the third fin 513a, and the fourth fin control the path of the gas that has passed through the exhaust path 59. Here, the gas G3 tends to rise because of its high temperature. Since the first fin 511a is inclined so that the tip thereof faces upward, it is difficult to block the rising gas G3. Therefore, the gas G3 can be discharged to a distant place of the power storage device 1. In particular, in this modification, since the second fin 512a is also inclined so that the tip thereof faces upward, the gas G3 is guided upward by hitting the second fin 512a and is discharged further. As described above, the fin portion 51a according to the present modification is suitable when it is desired to discharge the gas G3 to the outside without staying in the rack 901. In this case, it is desirable to arrange the slit group 935 on the discharge path of the gas G3.

In the above embodiment, the case where the first fin 511 and the second fin 512 are formed in a flat plate shape is illustrated. However, the first fin and the second fin may be formed in a curved shape.

In the above embodiment, the case where the projecting portion 180 is formed by the connecting portion 15c of the exterior body support 15 and the connecting portion 17c of the exterior body lid 17 is illustrated. However, the protruding portion 180 may be formed from only a part of the exterior body support portion or only a part of the exterior body lid body. The projecting portion 180 may be formed of a member retrofitted to the exterior body 18 (housing).

Further, in the above embodiment, the case where the fin portion 51 does not protrude from the protruding portion 180 (eaves) in the positive direction of the Y axis is illustrated, but the fin portion may protrude from the protruding portion.

Further, in the above embodiment, the case where the protruding portion 180 is arranged below the center P of the one end surface 99 is illustrated, but if the protruding portion is arranged below the fin portion 51, It may be arranged above the center P.

Further, the present invention can be realized not only as the power storage device 1 but also as the power storage equipment 900.

Further, a form constructed by arbitrarily combining each component included in the above-described embodiment and a modified example thereof is also included in the scope of the present invention.

The present invention can be applied to a power storage device or the like provided with a power storage element such as a lithium ion secondary battery.

1 Power storage device 10 Power storage unit 11 Power storage element 11a Container 11b Positive electrode terminal 11c Negative electrode terminal 11d Spacer 12 Bus bar frame 13 Bus bar 13a Detection line 13b Connector 14 Exterior body (housing)
15 Exterior support 15a Bottom 15b Connection 15c Connection 15d Fix 16 Board unit mounting 17 Exterior lid (cover member)
17a Top surface 17b Connection 17c Connection 18 Exterior 20 Board unit 30 Cable 31 Positive power cable 32 Negative power cable 50 Exhaust 50b Exhaust 51 Fin 51a Fin 59 Exhaust path 60 Exhaust member 61 Hole 62 Contact 63 Groove 64 Circular part 65 Lid member 71 First holding part 72 Second holding part 73 Connecting part 99 One end surface 111 Gas discharge valve 141 Notch part 151 Elastic body 151a Inclined surface 159 Installation surface 171 Opening part 180 Protruding part 181 Screw 511 First Fin 511a First fin 512 Second fin 512a Second fin 513 Third fin 513a Third fin 514 Fourth fin 601 Wall 602 Groove 621 Elastic body 651 Top plate 652 Wall 711 First outer wall 711a No. 1 missing 711b First severance 712 1st enclosure 713 1st partition wall 714 1st partition 715 1st cable path 721 2nd outer wall 721a 2nd notch 722 2nd enclosure 723 2nd partition wall 724 2nd partition 725 (Ii) Cable path 731 Beam 900 Storage equipment 901 Rack 910 Rack body 920 Front cover 925 Slit group 930 Back cover 935 Slit group 940 Shelf board 941 Stopper 942 Support hole 943 Concavo-convex structure 944 Recess 945 Convex G1, G11, G12, G3 gas G2 gas S1 to S4 gap P center L electrolyte

Claims (6)

A plurality of power storage elements each having a gas discharge valve and arranged so that the gas discharge valves face the same direction.
An exhaust unit arranged on the gas discharge valve of each of the plurality of power storage elements and forming an exhaust path for the gas discharged from the gas discharge valve.
A housing for accommodating the plurality of power storage elements and the exhaust unit,
A fin portion that protrudes from the housing and forms an outlet portion of the exhaust path is provided.
The fin portion is a power storage device having first fins protruding from the housing in an inclined state. The power storage device according to claim 1, wherein the fin portion includes a plurality of other fins surrounding the outlet portion together with the first fin. The power storage device according to claim 2, wherein a gap is provided between at least one adjacent fin formed by each of the first fin and the plurality of other fins. A cover member having an opening for covering the housing and projecting the fin portion is provided.
The plurality of other fins include a second fin facing the first fin and a third fin and a fourth fin arranged between the first fin and the second fin in the circumferential direction.
The first fin, the third fin, and the fourth fin are provided in the exhaust portion.
The power storage device according to claim 3, wherein the second fin is provided on the cover member. The power storage device according to any one of claims 1 to 4, wherein the first fin is arranged above the exhaust path and is inclined so that the tip thereof faces downward. The power storage device according to any one of claims 1 to 4, wherein the first fin is arranged above the exhaust path and is inclined so that the tip thereof faces upward.

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