JP7380075B2 - Power storage device - Google Patents

Description

The present invention relates to a power storage device.

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

Japanese Patent Application Publication No. 2007-27011

Here, it is also assumed that other devices are arranged near the exhaust port of the power storage device. If gas is ejected from the exhaust port of the power storage device in this state, other devices will be exposed to the heated gas, and there is a risk that the other devices will burn.

Therefore, an object of the present invention is to provide a power storage device that can improve safety when discharging gas.

In order to achieve the above object, a power storage device according to one embodiment of the present invention includes a plurality of power storage elements each having a gas exhaust valve, the gas discharge valves facing in the same direction, a plurality of power storage elements, and a plurality of power storage elements each having a gas exhaust valve. an exhaust section that is arranged on each gas exhaust valve of the element and forms an exhaust route for the gas discharged from the gas exhaust valve; a casing that accommodates the plurality of power storage elements and the exhaust section; and a fin portion forming an exit portion of the path, the fin portion having a first fin protruding from the housing in an inclined state.

According to this, since the first fin protrudes from the housing in an inclined state, the course of the gas can be controlled by the first fin. Therefore, it is possible to suppress the gas from hitting other devices adjacent to the power storage device. Further, since the first fin acts as a barrier when the gas travels straight, it is also possible to reduce the force of the gas toward other devices. For these reasons, the influence of the gas on other devices can be suppressed, and combustion of the other devices can be suppressed. Thereby, safety at the time of gas discharge can be improved.

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

According to this, since the exit 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. Thereby, it is possible to more reliably suppress the gas from hitting other devices, and it is possible to further improve safety when discharging the gas.

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

According to this, since a gap is provided between at least one adjacent space between the first fin and each of the plurality of other fins, gas is also discharged from the gap. Since the gas is thereby diffused, it is possible to more reliably prevent the gas from hitting other devices. Therefore, safety during gas discharge can be further improved.

The invention also includes a cover member that covers the housing and has an opening from which the fin portion protrudes, and the plurality of other fins include a second fin facing the first fin, and a first fin and a second fin in the circumferential direction. A third fin and a fourth fin are arranged between the exhaust parts, the first fin, the third fin and the fourth fin are provided in the exhaust part, and the second fin is provided in the cover member. Good too.

According to this, the first fin, the third fin, and the fourth fin are provided on the exhaust part, and the second fin is provided on the cover member, so it is easy to create a structure in which each fin surrounds the outlet part. can be formed into

Furthermore, since the housing is covered by the cover member, the electrolytic solution discharged from the fin portion along with the gas can be prevented from being applied to the housing, and ignition caused by the electrolytic solution can be suppressed. Therefore, safety during gas discharge can be further improved.

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

According to this, the first fin is disposed above the exhaust path and is slanted so that the tip faces downward, so that the gas can be reliably applied to the first fin. The course can be reliably controlled. Therefore, safety during gas discharge can be further improved.

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

Further, since the tips of the first fins are inclined so as to face downward, gas is easily discharged near the power storage device and easily remains in the rack that accommodates the power storage device. Therefore, it is suitable when it is desired to prevent gas from diffusing outside the rack.

The first fin is disposed above the exhaust path and may be inclined so that the tip thereof 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 its tip faces upward, it is difficult to block rising gas. Therefore, the gas G can be discharged far away from the power storage device, which is suitable when it is desired to discharge the gas without accumulating it in the rack.

According to the power storage device of the present invention, safety during gas discharge can be improved.

FIG. 1 is a perspective view showing the appearance of a power storage facility according to an embodiment. FIG. 1 is a perspective view showing the appearance of a power storage facility according to an embodiment. FIG. 2 is a perspective view showing a schematic configuration of a stopper according to an embodiment. FIG. 1 is a perspective view showing the appearance of a power storage device according to an embodiment. FIG. 3 is an exploded perspective view showing each component when the power storage unit according to the embodiment is disassembled. FIG. 2 is an exploded perspective view showing a schematic configuration of an exhaust section and a busbar frame according to an embodiment. FIG. 2 is an exploded perspective view showing a schematic configuration of an exhaust section and an exterior body lid according to an embodiment. FIG. 2 is a cross-sectional view of one end of the exhaust section on the Y-axis plus direction side according to the embodiment. FIG. 2 is a plan view showing a schematic configuration of one end of the exhaust section on the Y-axis plus direction side according to the embodiment. It is a sectional view showing a schematic structure of an exhaust part and a power storage element concerning an embodiment. FIG. 2 is a side view showing a schematic configuration of a fin portion according to an 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 based on a modification.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a power storage facility according to an embodiment of the present invention (including variations thereof) will be described with reference to the drawings. Note that the embodiments described below are all inclusive or specific examples. The numerical values, shapes, materials, components, arrangement positions and connection forms of the components shown in the following embodiments are merely examples, and do not limit the present invention. Further, in each figure, dimensions etc. are not strictly illustrated.

In addition, in the following explanation and drawings, the direction in which a plurality of power storage devices are arranged on one shelf, the direction in which a pair of electrode terminals (positive electrode side and negative electrode side) in one power storage element are arranged, the direction in which the container of the power storage element is arranged, etc. The direction in which the short sides face each other or the direction in which the long sides of the exterior body of the power storage unit face each other 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 lined up, the direction in which the long sides of the container of the power storage device face each other, the direction in which the power storage unit's exterior body is The direction in which the short sides face each other is defined as the Y-axis direction. The direction in which a plurality of shelf boards are lined up, the direction in which the exterior support of the power storage unit and the cover body of the power storage unit are lined up, the direction in which the power storage elements and the bus bar are lined up, the direction in which the container body and the lid of the power storage element are lined up, or the top and bottom. The direction is defined as the Z-axis direction. These X-axis direction, Y-axis direction, and Z-axis direction are directions that intersect with each other (orthogonal in this embodiment). Note that 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 as the vertical direction below.

Furthermore, 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 opposite direction to the X-axis plus direction. The same applies to the Y-axis direction and the Z-axis direction. Furthermore, hereinafter, the Y-axis direction may also be referred to as the first direction, the X-axis direction may also be referred to as the second direction, and the Z-axis direction may also be referred to as the third direction. Furthermore, expressions indicating relative directions or orientations, such as parallel and orthogonal, include cases where the directions or orientations are not strictly speaking. For example, when two directions are orthogonal, it does not only mean that the two directions are completely orthogonal, but also that they are substantially orthogonal, that is, there is a difference of only a few percent, for example. It also means to include.

[1 Description of the configuration of power storage equipment]
First, the configuration of power storage equipment 900 in this embodiment will be described. The power storage equipment 900 is a stationary storage battery board that stores power generated by, for example, wind power generation, solar power generation, etc., and stably supplies power to external equipment.

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

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

The rack main body 910 is, for example, a rectangular box made of metal, and openings are provided on the front and back surfaces thereof. The opening on the front side 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 part of the rack body 910 so as to open and close the opening on the front side of the rack body 910. The opening on the back side of the rack body 910 is covered by a pair of back covers 930. The pair of back covers 930 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 inside the rack body 910. The electric circuit unit houses, for example, a wiring 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 and discharging each power storage device 1 flows, and the control circuit is connected to the board unit 20 of each power storage device 1 by a signal line (not shown).

Each front cover 920 and each rear cover 930 are 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 in the front cover 920. In one slit group 925, a plurality of slits that are long 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 that are long in the Z-axis direction are arranged along the X-axis direction. The plurality of slit groups 925 and 935 ventilate the inside of the rack body 910 and prevent heat from accumulating inside the rack body 910.

[2 Shelf board]
Inside the rack body 910, a plurality of shelf boards 940 are arranged at predetermined intervals in the Z-axis direction. Shelf board 940 is an example of a support member that supports multiple power storage devices 1. Specifically, the shelf board 940 is a plate 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. A slit group 925 faces the end of power storage device 1 placed on shelf board 940 on the Y-axis negative direction side. Similarly, a slit group 935 faces the end of power storage device 1 placed on shelf board 940 on the Y-axis positive direction side. Thereby, heat emitted from power storage device 1 can be smoothly discharged to the outside of rack 901 through slit groups 925 and 935.

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

FIG. 3 is a perspective view showing a schematic configuration of the stopper 941 according to the embodiment. As shown in FIG. 3, stopper 941 restricts movement of power storage device 1 in the Y-axis positive direction by contacting the end of power storage device 1 on the Y-axis positive direction side. Specifically, the stopper 941 is a plate parallel to the XZ plane and elongated in the X-axis direction. A plurality of support holes 942 are formed in the stopper 941 at predetermined intervals along the X-axis direction. The support hole portion 942 passes through the stopper 941 in the Y-axis direction. The support hole 942 is a rectangular hole that is elongated in the X-axis direction. One support hole 942 corresponds to one power storage device 1. A protrusion 180 provided at the end of the power storage device 1 on the Y-axis plus direction side is inserted into the support hole 942 from the Y-axis minus direction. A concavo-convex structure 943 that contacts the protrusion 180 is formed on the periphery of the support hole 942 in the stopper 941 .

Specifically, the uneven structure 943 is provided at the upper part of the support hole 942 and at the edge of the center part. The concavo-convex structure 943 is formed by repeatedly arranging a plurality of sets of concave portions 944 and convex portions 945. Note that the uneven structure 943 only needs to have at least one recess 944 or one protrusion 945. The tip of the protrusion 945 is formed into an acute angle so as to fit into the protrusion 180. By bringing the tip of the convex portion 945 into contact with the protruding portion 180, movement of the power storage device 1 in the X-axis direction and the Y-axis direction can be restricted. Details of the protrusion 180 will be described later.

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

Power storage device 1 is a device that can charge electricity from the outside and discharge electricity to the outside, and in this embodiment, has a substantially rectangular parallelepiped shape. For example, the power storage device 1 is used for power storage, power supply, or the like. Specifically, the power storage device 1 is used, for example, as a stationary battery or the like used in household or industrial power storage equipment. Moreover, the power storage device 1 is, for example, a battery for driving or starting an engine of a mobile object such as a car, a motorcycle, a watercraft, a ship, a snowmobile, an agricultural machine, a construction machine, or a railway vehicle for an electric railway. It can be used as, etc. 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 above-mentioned railway vehicles for electric railways include electric trains, monorails, and linear motor cars.

As shown in FIGS. 4 and 5, power storage device 1 includes a power storage unit 10 and a board unit 20 attached to power storage unit 10. The power storage unit 10 is a battery module (battery assembly) having a substantially rectangular parallelepiped shape that is elongated in the Y-axis direction. Specifically, the power storage unit 10 includes a plurality of power storage elements 11, a busbar frame 12, an exhaust section 50, a plurality of busbars 13, an exterior main body 14, an exterior support 15, and an exterior body that accommodate these. It has an exterior body 18 consisting of a lid body 17. Further, a cable 30 is connected to the power storage unit 10. Note that the power storage unit 10 may include a restraining member (end plate, side plate, etc.) that restrains the plurality of power storage elements 11.

The power storage element 11 is a secondary battery (single battery) that can charge and discharge electricity, and more specifically, it is a nonaqueous electrolyte secondary battery such as a lithium ion secondary battery. . The power storage elements 11 have a flat rectangular parallelepiped shape (prismatic shape), and in this embodiment, 16 power storage elements 11 are arranged side by side in the Y-axis direction. Note that the shape, arrangement position, number, etc. of the power storage elements 11 are not particularly limited. Further, the power 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 a capacitor. Furthermore, the power storage element 11 may be a primary battery that can use the stored electricity without having to be charged by the user, instead of being a secondary battery. Furthermore, the power storage element 11 may be a battery using a solid electrolyte. Further, the power storage element 11 can also be a laminate 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 terminal 11b and the negative terminal 11c are provided on the upper surface of the main body. A gas exhaust valve 111 (see FIG. 10) is provided on the lid of the container 11a between the positive terminal 11b and the negative terminal 11c, which discharges gas to release the pressure when the pressure inside the container 11a increases. The plurality of power storage elements 11 are arranged with their respective gas exhaust valves 111 facing in the same direction (Z-axis positive direction). Further, a flat spacer 11d having heat insulation properties is arranged between adjacent power storage elements 11. Note that the lid of the container 11a may be provided with a liquid injection part or the like for pouring the electrolyte. Further, inside the container 11a, an electrode body (also referred to as a power storage element or a power generation element), a current collector (a positive electrode current collector and a negative electrode current collector), etc. are arranged, and an electrolytic solution (non-aqueous electrolyte) etc. Although it is enclosed, detailed explanation will be omitted.

Here, the positive electrode terminal 11b and the negative electrode terminal 11c are arranged to protrude upward (in the Z-axis positive direction) from the lid of the container 11a. Then, the outermost positive terminals 11b and negative 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 a charge/discharge current or main current) for charging and discharging the power storage device 1 (power storage element 11) flows, and has a positive electrode. It has a positive power cable 31 on the side and a negative power cable 32 on the negative side. That is, the positive power cable 31 of the cable 30 is connected to the positive terminal 11b of the power storage element 11 at the end in the Y-axis positive direction among the plurality of power storage elements 11, and the positive electrode terminal 11b of the power storage element 11 at the end in the Y-axis negative direction A negative power supply cable 32 of the cable 30 is connected to the negative terminal 11c of the cable 30.

The busbar frame 12 is a flat rectangular member that can electrically insulate the busbar 13 from other members and regulate the position of the busbar 13. The busbar frame 12 is made of an insulating member such as polycarbonate (PC), polypropylene (PP), polyethylene (PE), or the like. 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. Furthermore, a plurality of bus bars 13 are placed and positioned on the bus bar frame 12. Thereby, each bus bar 13 is positioned relative to the plurality of power storage elements 11 and joined to the positive electrode terminal 11b and negative electrode terminal 11c of the plurality of power storage elements 11. Details of the busbar frame 12 will be described later.

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

Each bus bar 13 is a rectangular plate-like member that is arranged on the plurality of power storage elements 11 (on the busbar frame 12) and electrically connects the electrode terminals of the plurality of power storage elements 11. The bus bar 13 is made of metal such as aluminum, aluminum alloy, copper, copper alloy, or nickel material, for example. In this embodiment, the bus bar 13 connects the 16 power storage elements 11 in series by connecting the positive terminals 11b and negative terminals 11c of adjacent power storage elements 11. The plurality of busbars 13 include a first busbar group arranged along the Y-axis direction on the X-axis positive direction side (one side) and a first busbar group arranged along the Y-axis direction on the X-axis minus direction side (other side). It is divided into a second busbar group. Note that the mode of connection of the power storage elements 11 is not limited to the above, and series connection and parallel connection may be combined in any manner.

Further, a detection line 13a is connected to the bus bar 13 or the electrode terminal of 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, for temperature measurement, or for voltage balance between the power storage elements 11. Note that a thermistor (not shown) for measuring the temperature of the power storage element 11 is arranged on the bus bar 13 or the electrode terminal of the power storage element 11, but a description thereof will be omitted. Furthermore, a connector 13b is connected to the end of the detection line 13a in the Y-axis negative direction. The connector 13b is a connector connected to a board of a board unit 20, which will be described later. That is, the detection line 13a transmits information such as the voltage and temperature of the power storage element 11 to the board of the board unit 20 via the connector 13b. Further, the detection line 13a also has a function of discharging the power storage elements 11 having a high voltage by controlling the board and balancing the voltages between the power storage elements 11.

Exterior body 18 is a rectangular (box-shaped) module case that constitutes the exterior body of 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 in a predetermined position, and protects the power storage element 11 and the like from impact and the like. Here, the exterior body 18 includes an exterior 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 the lid body (outer lid) of the exterior body 18. It has a body lid body 17.

The exterior body 14 is a bottomed rectangular cylindrical casing in which an opening is formed. The exterior body 14 is formed of an insulating member such as PC, PP, PE, etc., for example. The exterior main body 14 accommodates a plurality of power storage elements 11, an exhaust section 50, a bus bar frame 12, and the like. A notch 141 through which the exhaust section 50 passes is formed at one end of the exterior main body 14 on the Y-axis plus direction side and at the center of the upper part thereof. The cutout portion 141 is a rectangular cutout that is open at the top.

The exterior support 15 and the exterior lid 17 are members that protect (reinforce) the exterior 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 plate, for example. Note that the exterior support 15 and the exterior lid 17 may be made of the same material, or may be made 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 negative direction), and is fixed to the bottom part 15a, the board unit mounting part 16, and the connecting parts 15b and 15c. 15d. The bottom portion 15 a is a flat rectangular portion that constitutes the bottom portion of the power storage device 1 and extends in the Y-axis direction and parallel to the XY plane, and is disposed below the exterior body body 14 . When power storage device 1 is installed on shelf board 940, the lower surface of bottom portion 15a comes into contact with the upper surface of 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 attachment part 16 is a flat, rectangular part that stands upright in the Z-axis positive direction from the end of the bottom part 15a in the Y-axis negative direction, and the board unit 20 is attached thereto. The connecting portion 15b is a portion that is disposed at the end of the board unit mounting portion 16 in the Z-axis positive direction, projects in the Y-axis negative direction, and is connected to the exterior body lid 17. The connecting portion 15c is a portion that stands upright in the Z-axis positive direction from the end of the bottom portion 15a in the Y-axis positive direction and projects in the Y-axis positive direction, and is connected to the exterior body lid 17. The fixing part 15d is a flat, rectangular part that stands upright in the Z-axis minus direction from the end of the bottom part 15a in the Y-axis minus direction, and is fixed to the end of the shelf board 940 in the Y-axis minus direction. This is the end of the The fixing part 15d is arranged at the center of the bottom part 15a in the X-axis direction. In this embodiment, screws are used to fix the fixing portion 15d and the shelf board 940, but any fixing method may be used as long as it can be fixed and released freely.

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 lid 17 is a cover member that covers the exterior body 14 so as to close the opening of the exterior body 14, and includes a top surface portion 17a and connection portions 17b and 17c. There is. The top surface portion 17a is a flat, rectangular portion that constitutes the top surface portion of the power storage device 1 and extends in the Y-axis direction and parallel to the XY plane, and is disposed above the exterior body 14. The connecting portion 17b is a portion that is disposed at the end of the top surface portion 17a in the Y-axis negative direction, projects in the Y-axis negative direction, and is connected to the connecting portion 15b of the exterior body support 15. The connecting portion 17c is a portion that extends from the end of the top surface portion 17a in the Y-axis positive direction in the Z-axis negative direction and projects in the Y-axis positive direction, 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 sandwich the exterior body body 14 from above and below, and the connecting portions 15b and 15c and the connecting portions 17b and 17c are connected by screws or the like. This makes it a fixed configuration. As a result, each member (the bus bar frame 12, the plurality of power storage elements 11, and the exhaust section 50) housed in the exterior body 14 is vertically held between the exterior body support 15 and the exterior body lid 17. . Furthermore, the connecting portion 15c and the connecting portion 17c that are connected to each other constitute a protruding portion 180. Details of the protrusion 180 will be described later.

Further, in the connecting portion 17c of the exterior lid 17, an opening 171 (see FIG. 7, etc.) through which the exhaust portion 50 passes is formed in the center of the upper end (end on the Z-axis positive direction side). . The opening 171 has a shape in plan view that corresponds to the external shape of the exhaust section 50. In this embodiment, the opening 171 has a rectangular shape in plan view. One end of the exhaust section 50 on the Y-axis plus direction side protrudes from the exterior body 18 by passing through the opening 171 and the notch 141 of the exterior body body 14 .

As shown in FIG. 4, the board unit 20 is a device that can monitor the state of the power storage element 11 included in the power storage unit 10 and control the power storage element 11. In the present embodiment, the substrate unit 20 is a flat rectangular member that is attached to the end of the power storage unit 10 in the longitudinal direction, that is, to the side surface of the power storage unit 10 in the negative direction of the Y-axis. Specifically, the board unit 20 is rotatably attached to a board unit attachment portion 16 (see FIG. 5) provided on the exterior support 15 of the exterior body 18 of the power storage unit 10.

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

As shown in FIG. 6, the busbar frame 12 is an example of a busbar holding member that is disposed on the plurality of power storage elements 11 and holds the plurality of busbars 13. Specifically, the busbar frame 12 includes a first holding part 71, a second holding part 72, and a connecting part 73. Here, among the plurality of detection lines 13a, the plurality of detection lines 13a held by the first holding part 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 part 72 are referred to as second detection lines.

The first holding portion 71 is a portion of the busbar frame 12 on the X-axis positive direction side (one side), and is a portion that holds the first busbar group and the positive power cable 31. In addition, the first holding part 71 is connected to an electrode terminal (positive electrode terminal 11b or negative electrode terminal 11c) in the X-axis positive direction of each power storage element 11 or a plurality of first detection terminals connected to the bus bar 13 included in the first bus bar group. It also holds the lines.

The first holding portion 71 is arranged in the positive direction of the X-axis with respect to the gas discharge valve 111 of each power storage element 11 . The first holding part 71 has a first outer wall part 711 that surrounds the outer periphery of the first holding part 71, and a first surrounding wall 712 that surrounds each bus bar 13 together with the first outer wall part 711.

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

The first surrounding wall 712 is disposed within the first outer wall portion 711 on the positive side of the X-axis, and is elongated in the Y-axis direction. The end of the first surrounding wall 712 in the Y-axis positive direction is arranged between the power storage element 11 at the end in the Y-axis positive direction and the power storage element 11 adjacent thereto. The end of the first surrounding wall 712 in the negative Y-axis direction extends to the vicinity of the first cutout 711a of the first outer wall portion 711.

Inside the first surrounding wall 712, a plurality of first partition walls 713 arranged between each bus bar 13 and a plurality of first partitions 714 arranged between each power storage element 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 that is 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, a region further in the negative X-axis direction than the first surrounding wall 712 is a first cable path portion 715 that is penetrated along the Y-axis direction. The first cable path section 715 is arranged between the gas exhaust valve 111 of each power storage element 11 and each bus bar 13 included in the first bus bar group. In this way, the first cable path portion 715 is arranged inside the first busbar group in the X-axis direction within the busbar frame 12.

In the first cable path section 715, the positive power supply cable 31 and a plurality of first detection lines are arranged. The first cable route section 715 forms a route for the positive power supply cable 31 and the plurality of first detection lines. By being arranged in the first cable path section 715, the plurality of first detection lines and the positive power cable 31 avoid being between the first holding section 71 and the second holding section 72, that is, on the connecting section 73. It is arranged as follows.

The second holding portion 72 is a portion of the bus bar frame 12 on the X-axis negative direction side (the other side). The second holding part 72 is connected to the second busbar group, an electrode terminal (positive terminal 11b or negative terminal 11c) in the X-axis negative direction of each power storage element 11, or a plurality of busbars 13 connected to the second busbar group. The second detection line is held.

The second holding portion 72 is arranged in the negative direction of the X-axis relative to the gas exhaust valve 111 of each power storage element 11 . The second holding part 72 has a second outer wall part 721 that surrounds the outer periphery of the second holding part 72, and a second surrounding wall 722 that surrounds each bus bar 13 together with the second outer wall part 721.

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

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

In the region of the second surrounding wall 722 on the X-axis minus direction side, a plurality of second partition walls 723 arranged between each bus bar 13 and a plurality of second partitions 724 arranged between each power storage element 11 are provided. and is 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 that is 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, a region on the X-axis plus direction side of the second surrounding wall 722 is a second cable path portion 725 that is penetrated along the Y-axis direction. The second cable path section 725 is arranged between the gas exhaust valve 111 of each power storage element 11 and each bus bar 13 included in the second bus bar group. In this way, the second cable path section 725 is arranged inward in the X-axis direction within the busbar frame 12 from the second busbar group.

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

As shown in FIG. 6, the connecting part 73 is a part that connects the first holding part 71 and the second holding part 72. Specifically, the connecting portion 73 includes a plurality of beam portions 731 that are elongated in the X-axis direction and have one end connected to the first holding portion 71 and the other end connected to the second holding portion 72. ing. The plurality of beam portions 731 are arranged at predetermined intervals in the Y-axis direction. The exhaust section 50 is arranged on the plurality of beam sections 731. Among the plurality of beam portions 731, the beam portion 731 at the end in the Y-axis negative direction is arranged outside the power storage element 11 at the end in the Y-axis negative direction. Furthermore, the beam portion 731 at the end in the Y-axis positive direction is arranged outside the power storage element 11 at the end in the Y-axis positive direction. Beam portions 731 other than these are arranged between a pair of adjacent power storage elements 11. In this way, the plurality of beam parts 731 are arranged at positions retracted from the gas exhaust valve 111 of each power storage element 11. In other words, the gas exhaust valve 111 of each power storage element 11 is exposed from the plurality of beam portions 731 when viewed from above.

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

As shown in FIGS. 6 to 10, the exhaust section 50 includes an exhaust member 60 and a lid member 65. The exhaust member 60 is disposed directly above the gas exhaust valve 111 of each power storage element 11 while being supported by the bus bar frame 12 as a whole. The exhaust member 60 is formed in a U-shape with an open top when viewed in the Y-axis direction, and is a resin-made member that is elongated in the Y-axis direction. The length of the exhaust member 60 in the Y-axis direction corresponds to the entire length of the exterior body body 14 in the Y-axis direction. Therefore, the entire exhaust member 60 can be housed within the exterior body main body 14.

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

Furthermore, a plurality of holes 61 are formed in the center of the bottom of the exhaust member 60 in the X-axis direction to expose the gas exhaust valves 111 of each power storage element 11 . A plurality of contact portions 62 are provided on the outer bottom surface of the exhaust member 60 and protrude so as to continuously surround the entire circumference of each hole portion 61 . A flat elastic body 621 made of, for example, rubber is laminated on the lower surface of each contact portion 62 . Each contact portion 62 has a substantially rectangular outer shape in 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 this groove portion 63, each contact portion 62 can be divided, and a convex contact portion 62 can be easily formed.

As shown in FIG. 10, the contact portion 62 is a convex portion that protrudes toward the power storage element 11, and its tip surface (lower end surface) is in contact with the lid 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 with the elastic body 621 being compressed. The contact portion 62 surrounds the entire circumference of the gas exhaust valve 111 provided in the lid, and an elastic body 621 seals the boundary between the gas exhaust valve 111 and the hole 61 . The hole 61 is formed to be longer than the gas exhaust valve 111 in the direction in which the plurality of electrode terminals (the positive electrode terminal 11b and the negative electrode terminal 11c) of the power storage element 11 are arranged (X-axis direction).

Here, the size of the power storage element 11 in the Y-axis direction is smaller than the size in the X-axis direction. In other words, it is difficult to enlarge the hole 61 in the Y-axis direction. On the other hand, in the X-axis direction, the hole 61 is made longer than the gas exhaust valve 111 because it is easy to make the hole 61 larger. Thereby, when the gas exhaust valve 111 is opened, it is possible to prevent the opening from being blocked by the hole 61, and smooth gas discharge is possible. Note that if the hole portion 61 as a whole has a larger shape than the gas exhaust valve 111, smoother gas exhaustion is possible.

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

The exhaust member 60 may be made of a resin having higher heat resistance than the busbar frame 12. For example, if the busbar 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 busbar frame and the exhaust member are integrally molded from a single resin, it is necessary to mold them all from a resin with high heat resistance. Since only the exhaust member 60 of the body needs to be made of a resin with high heat resistance, the amount of the resin used can be suppressed.

As shown in FIGS. 6 to 10, the lid member 65 is disposed 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 an open bottom when viewed in the Y-axis direction, and is a member that is elongated 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 section 651 is a long rectangular plate section parallel to the XY plane. The pair of wall portions 652 are provided on the lower surface of both ends of the top plate portion 651 in the X-axis direction. Each wall portion 652 is formed parallel to the YZ plane. The lower end of each wall portion 652 is in contact with the bottom surface of the groove 602 of the exhaust member 60, as shown in FIG. In this way, since the lower end of each wall portion 652 is accommodated in the groove 602 and is in contact with the bottom surface of the groove 602, compared to the case where 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 located 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. This pressing force presses the pair of wall portions 652 of the lid member 65 against the bottom surface of the groove 602, so that higher sealing performance can be achieved. Further, when gas is discharged from the gas discharge valve 111 of the power storage element 11, the lid member 65 receives the gas, so that the lid member 65 may float. Since the lid member 65 receives a downward pressing force from the exterior body lid 17, lifting of the lid member 65 due to gas discharge can be suppressed.

Further, since a downward pressing force is 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. Thereby, the elastic body 621 of the exhaust member 60 can be reliably compressed, and higher adhesion can be exhibited. Further, by this pressing force, it is also possible to suppress vertical displacement of the plurality of power storage elements 11.

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 Y-axis plus direction side can be made to protrude from the exhaust member 60.

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

The fin portion 51 protrudes from the end of the exterior body 14 on the positive side in the Y-axis direction and forms an exit portion of the exhaust path 59. Specifically, the fin portion 51 includes 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 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 exit 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 exhaust valve 111 is opened.

The details of each fin will be explained below.

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

The second fin 512 projects outward from the lower edge of the opening 171 of the exterior lid 17 . Specifically, the second fin 512 is formed in a rectangular flat plate shape that is elongated in the X-axis direction, and protrudes from the lower edge of the opening 171 in the Y-axis plus direction. The second fin 512 is arranged opposite to the first fin 511 in the Z-axis direction. Here, a case is illustrated in which the protrusion length of the second fin 512 in the Y-axis direction is shorter than the protrusion length of the first fin 511, but it may be equal to or longer than the protrusion length of the first fin 511. The second fin 512 is a portion cut and raised when forming the opening 171 with respect to the connection portion 17c of the exterior lid 17. The second fin 512 projects 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 acute angle between the second fin 512 and the Y-axis direction is within a range of 30 degrees or more and 60 degrees or less. In this embodiment, the acute angle between the second fin 512 and the Y-axis direction is approximately 45 degrees. That is, the second fin 512 is arranged parallel to the first fin 511. Note that the second fins 512 may be non-parallel to the first fins 511.

The third fin 513 is provided on one of the pair of wall portions 652 of the lid member 65 on the X-axis negative direction side. The fourth fin 514 is provided on the wall portion 652 of the pair of wall portions 652 of the lid member 65 on the X-axis plus direction side. The third fin 513 and the fourth fin 514 are arranged to face each other in the X-axis direction. The third fin 513 and the fourth fin 514 have the same structure except that they are installed at different locations. Therefore, the details of the third fin 513 will be explained here, and the explanation of the fourth fin 514 will be omitted.

The third fin 513 is one end of the wall portion 652 on the X-axis negative direction side on the Y-axis positive direction side, and is a flat plate-shaped portion of the wall portion 652 that protrudes outward from the opening 171 of the exterior lid 17. It is a part. The third fin 513 protrudes in 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 protrusion length of the third fin 513 in the Y-axis direction is approximately the same as the protrusion length of the first fin 511. The third fin 513 has a tapered shape that becomes thinner toward the positive 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 when viewed in the X-axis direction.

In this way, since the third fin 513 has a shape that does not overlap with 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 A gap S2 is formed between the fin 512 and the third fin 513 adjacent to each other. In this embodiment, the third fin 513 is formed into a trapezoidal shape when viewed in the X-axis direction, but any shape may be used as long as the gaps S1 and S2 are formed. As described above, the fourth fin 514 has the same structure as the third fin 513, so a gap S3 is formed between the first fin 511 and the fourth fin 514, and the gap S3 is formed between the second fin 512 and the fourth fin 514. A gap S4 is formed between adjacent four fins 514. Each of the gaps S1 to S4 is provided continuously over the entire length of the fin portion 51. Specifically, as shown in FIG. 8, the gaps S1 and S3 are gaps that extend with an even width as a whole. The gaps S2 and S4 are gaps that gradually become wider in the positive direction 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 board 940, and the back cover 930 are illustrated 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 Y-axis positive direction. Furthermore, the fin portion 51 protrudes outward from the end of the shelf board 940 in the Y-axis positive direction.

The gas discharged from the gas exhaust 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 . Thereafter, 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 located outside 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 exit 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 fins 511 act as a barrier when the gas travels straight, so they change the direction of gas travel downward.

In FIG. 11, the gas whose traveling direction has been changed by the fin portion 51 is indicated by the symbol G1. 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 the contact. Furthermore, in the gas G1, the distance to reach the slit group 935 is longer than if the traveling direction remained straight. This also reduces the force of the gas G1. Here, if the acute angle between the first fin 511 and the Y-axis direction is less than 30 degrees, the distance to the slit group 935 in the gas G1 cannot be made very long. On the other hand, if the acute angle between the first fins 511 and the Y-axis direction is larger than 60 degrees, the first fins 511 may block the exhaust path 59 and prevent smooth exhaust. Therefore, as described above, the acute angle between the first fin 511 and the Y-axis direction is within the range of 30 degrees or more and 60 degrees or less.

Gas also leaks from each of the gaps S1 to S4. In FIG. 11, the gas leaking from the gap S1 is labeled G11, and the gas leaking from the gap S2 is labeled G12. In this way, the gases G11 and G12 are discharged and diffused from the respective gaps S1 to S4, so that the force of the gas G1 is further reduced.

Here, FIG. 12 is a side view showing the gas G2 discharged from the exhaust section 50b, which is a comparative example. FIG. 12 is a diagram corresponding to FIG. 11. The exhaust section 50b of the comparative example differs from the exhaust section 50 according to the present embodiment in that one end in the positive Y-axis direction is cylindrical. Therefore, the gas G2 is vigorously ejected from one end of the exhaust portion 50b. Due to this force, gas G2 hits other devices (such as other power storage equipment, etc.) in the vicinity of power storage equipment 900 through slit group 935 of back cover 930. This may cause the gas G2 to have an effect on other devices.

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

[6 Projection]
Next, details of the protrusion 180 will be explained. As shown in FIGS. 3, 9, and 11, protrusion 180 is an example of an eaves portion that protrudes in the Y-axis plus direction from one end surface 99 of 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 together by screws 181 in a vertically stacked state. Specifically, the connecting portion 15c and the connecting portion 17c each have a rectangular plate-like portion that is parallel to the XY plane and elongated in the X-axis direction. An elastic body 151 made of, for example, rubber 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 triangular prism-shaped member that is elongated 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. Thereby, the protrusion 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 negative direction with respect to the support hole 942, so that the protrusion 180 is inserted into the support hole 942. If the protrusion 180 has a tapered shape, it can be smoothly inserted into the support hole 942, thereby improving the operability during insertion.

Further, the elastic body 151 is provided in a longer range than the uneven structure 943 in the X-axis direction. As a result, when the protrusion 180 is inserted into the support hole 942 of the shelf board 940, the entire uneven 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 and returned to the electrolytic solution. That is, the electrolyte L may fall from the fin portion 51 as shown in FIG. 11 . In particular, since the fin portion 51 is tilted downward, the electrolytic solution L that has fallen from the fin portion 51 can easily reach the protrusion 180 .

Since the protruding portion 180 is disposed between the installation surface 159 of the power storage device 1 and the fin portion 51, it can receive the electrolyte L that has fallen from the fin portion 51. Specifically, since the elastic body 151 provided on the protrusion 180 is disposed below the fin portion 51, the inclined surface 151a of the elastic body 151 receives the electrolyte L. The electrolytic solution L is guided in the positive direction of the Y-axis by the inclined surface 151a of the elastic body 151. As a result, the heated electrolytic solution L separates from one end surface 99 of power storage device 1 .

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

Further, as shown in FIG. 9, when one end surface 99 of the power storage device 1 is viewed from above, when the center P of the one end surface 99 is taken as a reference, the protrusion 180 is disposed below the center P. The fin portion 51 is arranged above the center P. In this way, since the fin portion 51 is arranged at the upper part of the one end surface 99 and the protrusion part 180 is arranged at the lower part, the falling path of the electrolyte L from the fin part 51 to the protrusion part 180 is lengthened. can do. Therefore, the time during which the electrolytic solution L is exposed to air can be increased, and the electrolytic solution L can be cooled as much as possible. Thereby, the temperature when the electrolytic solution L contacts the protrusion 180 can be lowered, and thermal deformation of the protrusion 180 can be suppressed.

[7 Explanation of effects]
As described above, according to the power storage device 1 according to the present embodiment, a plurality of power storage elements 11 each having a gas discharge valve 111 and arranged with the gas discharge valves 111 facing in the same direction, an exhaust section 50 that is disposed on each gas exhaust valve 111 of each of the power storage elements 11 and forms an exhaust path 59 for the gas discharged from the gas exhaust valve 111; and an exterior housing that accommodates the plurality of power storage elements 11 and the exhaust section 50. The fin portion 51 includes a main body 14 (housing) and a fin portion 51 that protrudes from the main body 14 and serves as an outlet of the exhaust path 59, and the fin portion 51 is a first fin that projects from the main body 14 in an inclined state. 511.

According to this, since the first fins 511 protrude from the exterior body main body 14 in an inclined state, the course of the gas G1 can be controlled by the first fins 511. Therefore, it is possible to prevent gas G1 from hitting other devices adjacent to power storage device 1. Moreover, since the first fin 511 acts as a barrier when the gas travels straight, it is also possible to reduce the force of the gas G1 toward other devices. For these reasons, it is possible to suppress the influence of the gas G1 on other devices, and it is possible to suppress the burning of the other devices. Thereby, safety at the time of gas discharge can be improved.

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

According to this, since the exit portion of the exhaust path 59 is surrounded by the first fin 511 and a plurality of other fins, the path of the gas G1 can be controlled more reliably. Thereby, it is possible to more reliably suppress the gas G1 from hitting other devices, and it is possible to further improve safety when discharging the gas.

Furthermore, gaps S1 to S4 are provided between at least one adjacent fin between the first fin 511 and each of the plurality of other fins.

According to this, since the gaps S1 to S4 are provided between at least one adjacent space between the first fin 511 and each of the plurality of other fins, the gases G11 and G12 are also discharged from the gaps S1 to S4. be discharged. Since the gases G11 and G12 are thereby diffused, it is possible to more reliably suppress the gases G11 and G12 from hitting other devices. Moreover, since the force of the gas G1 is also reduced, it is possible to more reliably suppress the gas G1 from hitting other devices. Safety during gas discharge can be further improved.

The power storage device 1 also includes an exterior cover body 17 (cover member) that covers the exterior body body 14 and has an opening 171 through which the fin portion 51 protrudes. Comprising second fins 512 facing each other, and third fins 513 and fourth fins 514 disposed between the first fins 511 and the second fins 512 in the circumferential direction, the first fins 511, the third fins 513, and the The four fins 514 are provided on the exhaust section 50, and the second fins 512 are provided on the exterior lid 17.

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

In addition, since the exterior body lid 17 covers the exterior body body 14, it is possible to suppress the electrolyte L discharged from the fin portion 51 together with the gas from splashing onto the exterior body body 14, and prevent the electrolyte L from being the cause of the Ignition can be suppressed. Therefore, safety during gas discharge can be further improved.

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, the first fin 511 is arranged above the exhaust path 59 and is inclined so that the tip thereof faces downward, so that the gas can be reliably applied to the first fin 511. This makes it possible to reliably control the path of the gas. Therefore, safety during gas discharge can be further improved.

Further, since the tips of the first fins 411 are inclined so as to face downward, gas is easily discharged near the power storage device 1 and easily remains inside the rack 901. Therefore, it is suitable when it is desired to prevent the gas from diffusing outside the rack 901.

Furthermore, since the first fins 511 fit within the exhaust path 59 when viewed in the gas traveling direction, the upward enlargement of the power storage device 1 can be suppressed.

[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. In other words, the embodiments disclosed this time should be considered to be illustrative in all respects and not restrictive. The scope of the present invention is indicated by the claims rather than the above description, and it is intended that all changes within the meaning and range equivalent to the claims are included.

For example, in the embodiment described above, the fin portion 51 includes the first fin 511 to the fourth fin 514. However, the fin portion only needs to 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 gaps S1 to S4 are provided between adjacent first fins 511 to fourth fins 514 is exemplified, but it is sufficient that a gap is provided between at least one adjacent fin. Further, there may be no gap between adjacent ones.

In the embodiment described above, the first fin 511, the third fin 513, and the fourth fin 514 are integrally molded with the lid member 65 of the exhaust section 50, and the second fin 512 is integrally molded with the exterior body lid 17. An example is shown below. However, each fin may be installed at any location, and each fin may be originally separate from the lid member or the exterior body lid and may be attached afterwards.

In the embodiment described above, the first fin 511 is arranged above the exhaust path 59, and the tip thereof is inclined so as to face downward. However, as long as the first fin is arranged in an inclined state within the exhaust path, the first fin may be installed in any location and in any direction. For example, the first fin may be disposed below the exhaust path and may be inclined such that the tip thereof faces upward. Further, the first fin may be arranged on one side of the exhaust path in the X-axis direction and 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 modification. Specifically, FIG. 13 is a diagram corresponding to FIG. 11. As shown in FIG. 13, the fin portion 51a according to the modification 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 shaped to form 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, illustration of gas leaking from the gaps S1 and S2 is omitted.

In the fin portion 51a, a first fin 511a, a second fin 512a, a third fin 513a, and a fourth fin surround the exit 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 fins 511a are inclined so that the tips thereof face upward, it is difficult to block the rising gas G3. Therefore, gas G3 can be discharged far away from power storage device 1. In particular, in this modification, the second fin 512a is also inclined so that the tip thereof faces upward, so that the gas G3 hits the second fin 512a, is guided upward, and is discharged further away. In this manner, the fin portion 51a according to the present modification is suitable when it is desired to release the gas G3 to the outside without retaining it within 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 first fin 511 and the second fin 512 are formed into a flat plate shape. However, the first fin and the second fin may be formed in a curved shape.

In the above embodiment, the case where the protrusion 180 is formed by the connection part 15c of the exterior body support 15 and the connection part 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 part or only a part of the exterior body lid. The protruding portion 180 may be formed from a member added later to the exterior body 18 (casing).

Further, in the above embodiment, the case where the fin portion 51 does not protrude further than the protruding portion 180 (eaves portion) in the Y-axis plus direction is exemplified, but the fin portion may protrude more than the protruding portion.

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

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

Furthermore, the scope of the present invention also includes a configuration constructed by arbitrarily combining each component included in the above embodiment and its modified examples.

INDUSTRIAL APPLICATION This invention is applicable to the electrical storage device etc. which are equipped with electrical storage elements, such as a lithium ion secondary battery.

1 Power storage device 10 Power storage unit 11 Power storage element 11a Container 11b Positive terminal 11c Negative terminal 11d Spacer 12 Busbar frame 13 Busbar 13a Detection wire 13b Connector 14 Exterior main body (casing)
15 Exterior body support 15a Bottom portion 15b Connection portion 15c Connection portion 15d Fixing portion 16 Board unit mounting portion 17 Exterior body lid (cover member)
17a Top section 17b Connection section 17c Connection section 18 Exterior body 20 Board unit 30 Cable 31 Positive power cable 32 Negative power cable 50 Exhaust section 50b Exhaust section 51 Fin section 51a Fin section 59 Exhaust route 60 Exhaust member 61 Hole 62 Contact section 63 Groove portion 64 Annular portion 65 Lid member 71 First holding portion 72 Second holding portion 73 Connecting portion 99 One end surface 111 Gas discharge valve 141 Notch portion 151 Elastic body 151a Inclined surface 159 Installation surface 171 Opening portion 180 Projecting portion 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 portion 602 Groove 621 Elastic body 651 Top plate portion 652 Wall portion 711 First outer wall portion 711a First cutout 711b First cutout 712 First surrounding wall 713 First partition wall 714 First partition part 715 First cable route part 721 Second outer wall part 721a Second cutout 722 Second surrounding wall 723 Second partition wall 724 Second partition part 725 Two cable path section 731 Beam section 900 Power storage equipment 901 Rack 910 Rack main body 920 Front cover 925 Slit group 930 Back cover 935 Slit group 940 Shelf board 941 Stopper 942 Support hole section 943 Uneven structure 944 Recessed section 945 Convex section 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 exhaust valve and arranged in a posture with the gas exhaust valves facing in the same direction;
an exhaust section that is disposed on the gas exhaust valve of each of the plurality of power storage elements and forms an exhaust path for gas exhausted from the gas exhaust valve;
a casing that accommodates the plurality of power storage elements and the exhaust section;
a fin portion protruding from the casing and forming an exit portion of the exhaust path;
The fin portion has a first fin that projects obliquely from the housing. The power storage device. 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 portion of each of the first fin and the plurality of other fins. a cover member that covers the casing and has an opening through which the fin portion protrudes;
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 part,
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 disposed above the exhaust path and is inclined so that a tip thereof faces downward. The power storage device according to any one of claims 1 to 4, wherein the first fin is disposed above the exhaust path and is inclined so that a tip thereof faces upward.

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