JP7400339B2 - Power storage device - Google Patents

Description

The present invention relates to a power storage device.

Conventionally, a plurality of detection lines are used to detect the state (for example, voltage, temperature, etc.) of a plurality of power storage elements (single cells 7) arranged in a predetermined direction in a case (stack case). A power storage device to which a harness H (harness H) is electrically connected is known (see, for example, Patent Document 1).

Japanese Patent Application Publication No. 2013-73915

Here, in the above-described power storage device, since the plurality of detection lines are arranged to spread out in a plane on the plurality of power storage elements, the space on the plurality of power storage elements is consumed accordingly.

Therefore, an object of the present invention is to provide a power storage device that can save space on a plurality of power storage elements.

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 arranged along a predetermined direction, a plurality of bus bars electrically connected to the plurality of power storage elements, In order to detect the state of at least two of the plurality of electricity storage elements, a plurality of detection lines are electrically connected to each of the at least two electricity storage elements, and a plurality of detection lines arranged on the plurality of electricity storage elements are used. a busbar holding member that holds a busbar and a plurality of detection wires, the busbar holding member is arranged near one of the at least two electricity storage elements, and the busbar holding member holds the detection wire connected to the electricity storage element. It has a detection line holding part that holds the connection terminal above another detection line connected to another power storage element.

According to this, the detection line holding section holds the connection terminal of the detection line connected to one power storage element above the other detection line, so that the connection terminal and the other detection line are connected to the upper surface. They can be placed on top of each other visually. This makes it difficult for the connection terminals and other detection lines to be spread out in a planar manner, and it is possible to save space.

Further, the detection line holding section may hold the connection terminal at a position where the connection terminal overlaps another detection line when viewed from above.

According to this, since the connection terminal is arranged at a position overlapping with the other detection line in a plan view, the connection terminal and the other detection line can be arranged reliably in an overlapping manner. This makes it possible to more reliably save space.

Moreover, the detection line holding part may have a first wall part interposed between the connection terminal of the held detection line and another detection line.

According to this, the first wall of the detection wire holding section is interposed between the connection terminal held and the other detection wires, so the connection terminal interferes with the other detection wires. can be restrained from doing so. Therefore, it is possible to prevent the connection terminal from damaging other detection lines, and it is possible to suppress the occurrence of short circuits caused by the damage. This eliminates the need to provide a special member for short-circuit prevention, making it possible to further save space.

Further, the detection line holding section may include a spring section that restricts the connection terminal.

According to this, since the detection line holding part has the spring part that regulates the connection terminal, the spring part can suppress displacement of the connection terminal.

The detection line holding section also includes a first wall section that regulates other detection lines passing below the detection line holding section from above, and a second wall section that regulates the other detection lines from one side. It may have.

According to this, the first wall part of the detection holding part restricts the upward movement of the other detection lines, and the second wall part restricts the lateral movement of the other detection lines. It is possible to prevent the detection line from moving and interfering with the connection terminal.

Further, the connection terminal may be formed in a stepped shape such that the base is located above the tip connected to the power storage element, and the detection line holding section may hold the base of the connection terminal. .

According to this, the connection terminal is formed in a stepped shape, and the base part located above the tip part connected to the electricity storage element is held by the detection line holding part, so that the bottom part of the detection line holding part Spaces for other detection lines can be easily formed.

According to the power storage device of the present invention, it is possible to save space on a plurality of power storage elements.

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 a top view showing a schematic configuration of a busbar frame according to an embodiment. FIG. 3 is an explanatory diagram showing a positional relationship between a beam portion and a power storage element according to an embodiment. FIG. 3 is a cross-sectional view showing the positional relationship between the beam part and the exhaust part according to the embodiment. FIG. 2 is a top view showing a schematic configuration of a guide section according to an embodiment. FIG. 2 is a perspective view showing a schematic configuration of a detection line holding section according to an embodiment. FIG. 2 is a cross-sectional view showing a schematic configuration of a detection line holding section according to an embodiment. FIG. 3 is a cross-sectional view showing a schematic configuration of a detection line holding section according to modification example 1. FIG. 7 is a perspective view of the busbar frame according to Modification 2, showing the vicinity of a guide portion.

Hereinafter, a power storage device 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 pair of electrode terminals (positive electrode side and negative electrode side) in one power storage element are lined up, the direction in which the short sides of the container of the power storage element are opposite, or the length of the exterior body of the power storage unit The opposing direction of the side surfaces is defined as the X-axis direction. The direction in which the plurality of power storage elements are lined up, the direction in which the long sides of the containers of the power storage elements face each other, the direction in which the short sides of the exterior body of the power storage unit face each other, and the direction in which the power storage units and the board unit are lined up are defined as the Y-axis direction. The Z-axis direction is defined as the direction in which the exterior support and the lid 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 vertical direction. do. 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.

(Embodiment)
[1 Description of the configuration of the power storage device]
First, the configuration of power storage device 1 in this embodiment will be described. FIG. 1 is a perspective view showing the appearance of a power storage device 1 according to an embodiment. FIG. 2 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 used for home use, a generator, or the like. 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 these figures, the power storage device 1 includes a power storage unit 10 and a board unit 20 attached to the 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. 4) 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 bus bar frame 12 is made of an insulating material similar to the board accommodating portion 100 of the board unit 20 described later, such as polycarbonate (PC), polypropylene (PP), or polyethylene (PE). Specifically, the bus bar frame 12 is placed above the plurality of power storage elements 11 and positioned with respect to the plurality of power storage elements 11. 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. The busbar frame 12 also has the function of reinforcing the exterior body 14 as an inner cover of the exterior body 18 . 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. 6) 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 is an exhaust port section 51 through 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, stainless steel, or the like. 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 bus bars 13 include a first bus bar group 131 arranged along the Y-axis direction on the X-axis positive direction side (one side), and a first bus bar group 131 arranged along the Y-axis direction on the X-axis negative direction side (other side). It is divided into an arranged second bus bar group 132. 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 200 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 200 of the board unit 20 via the connector 13b. The detection line 13a also has a function of discharging the power storage elements 11 having a high voltage under the control of the board 200 and balancing the voltages between the power storage elements 11.

The exterior body 18 is a rectangular (box-shaped) container (module case) that constitutes the exterior body of the power storage unit 10 . That is, the exterior body 18 is disposed outside the power storage element 11 and the like, fixes the power storage element 11 and the like 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 housing with an opening formed therein. The exterior body 14 is formed of an insulating member similar to the board accommodating portion 100 of the board unit 20 described later, such as PC, PP, PE, etc., for example.

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 support 15 is a member that supports the exterior body 14 from below (Z-axis negative direction), and includes a bottom portion 15a, a board unit attachment portion 16, and connection portions 15b and 15c. 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 . 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 exterior lid 17 is a member disposed to close the opening of the exterior body 14, and includes a top surface portion 17a and connection portions 17b and 17c. 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.

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 provided on the exterior support 15 of the exterior body 18 of the power storage unit 10 .

[2 Configuration of exhaust section and busbar frame]
FIG. 3 is an exploded perspective view showing a schematic configuration of the exhaust section 50 and the busbar frame 12 according to the embodiment.

As shown in FIG. 3, the exhaust section 50 includes an exhaust member 60 and a lid member 65. Exhaust member 60 is arranged directly above gas exhaust valve 111 of each power storage element 11 . 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. A plurality of holes 61 are formed at the bottom of the exhaust member 60 to expose the gas exhaust valves 111 of each power storage element 11 .

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.

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 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 is made of metal and has higher heat dissipation than 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. That is, one end portion of the lid member 65 is the exhaust port portion 51 through which gas is exhausted. The exhaust port portion 51 projects outward from the end of the busbar frame 12 in the Y-axis positive direction. Therefore, 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 exhaust port 51 located outside the bus bar frame 12.

Next, details of the busbar frame 12 will be explained. FIG. 4 is a top view showing a schematic configuration of the busbar frame 12 according to the embodiment. In FIG. 4, the power storage element 11, the bus bar 13, the positive power cable 31, the negative power cable 32, and the plurality of detection lines 13a are also illustrated.

As shown in FIGS. 3 and 4, 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 13a1. 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 13a2.

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 131 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 The detection line 13a1 is also held.

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 13a1 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 131. In this way, the first cable path portion 715 is arranged inside the first busbar group 131 in the X-axis direction within the busbar frame 12.

In the first cable path portion 715, the positive power cable 31 and the plurality of first detection lines 13a1 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 13a1. In other words, the first cable route section 715 can also be said to be a first detection line route that is a route for the plurality of first detection lines 13a1. The plurality of first detection lines 13a1 and the positive power cable 31 are arranged in the first cable path section 715, thereby avoiding the space between the first holding section 71 and the second holding section 72, that is, on the connecting section 73. It is arranged as follows.

In the first cable path portion 715, the positive power cable 31 and each of the plurality of first detection lines 13a1 are arranged in a posture generally along the Y-axis direction. The first cable path section 715 has a guide section 80 that guides one end of the positive power cable 31. Further, the first cable path section 715 includes a plurality of detection line holding sections 90 that hold the first detection line 13a1. Details of the guide section 80 and the detection line holding section 90 will be described later.

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 132 and the electrode terminal (positive electrode terminal 11b or negative electrode terminal 11c) in the X-axis negative direction of each power storage element 11, or to the busbar 13 included in the second busbar group 132. It holds a plurality of second detection lines 13a2.

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 13a2 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 132. In this way, the second cable path portion 725 is arranged inward in the X-axis direction within the busbar frame 12 from the second busbar group 132.

A plurality of second detection lines 13a2 are arranged in the second cable path section 725. The second cable route section 725 can be said to be a second detection line route that is a route for the plurality of second detection lines 13a2. The plurality of second detection lines 13a2 are arranged within the second cable path section 725, so that they are arranged avoiding between the first holding section 71 and the second holding section 72, that is, on the connecting section 73. There is.

Within the second cable path section 725, each of the plurality of second detection lines 13a2 is arranged in a posture generally along the Y-axis direction. A plurality of detection line locking portions 99 are provided within the second cable path portion 725 to lock each second detection wire 13a2. The plurality of detection line locking parts 99 are arranged along the Y-axis direction. The detection line locking part 99 is a long protrusion in the X-axis direction, and a space is formed below it through which the second detection line 13a2 passes in the Y-axis direction. By penetrating the second detection line 13a2 into this space, the detection line locking portion 99 suppresses floating of the second detection line 13a2. The plurality of detection line locking portions 99 all have the same shape, but differ in the number of second detection lines 13a2 that are locked. Specifically, as shown in FIG. 4, the detection line locking part 99 furthest from the second notch 721a, that is, the detection line locking part 99 located furthest in the Y-axis positive direction, The line 13a2 is held. It is possible to increase the number of second detection lines 13a2 that are locked by each detection line locking section 99 one by one toward the negative Y-axis direction. Note that in a location where there are many second detection lines 13a2, one detection line locking portion 99 may or may not hold all the second detection lines 13a2.

As shown in FIGS. 3 and 4, 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. 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.

[3 Beam]
FIG. 5 is an explanatory diagram showing the positional relationship between the beam portion 731 and the power storage element 11 according to the embodiment. Specifically, FIG. 5 is a view of a cross section including the VV line in FIG. 4. In FIG. 5, the power storage element 11 is shown in a plan view, and the beam portion 731 is shown in a cross-sectional view. Further, FIG. 6 is a cross-sectional view showing the positional relationship between the beam portion 731 and the exhaust portion 50 according to the embodiment. Specifically, FIG. 6 is a cross-sectional view of the position of the beam portion 731 taken along the XZ plane.

As shown in FIGS. 5 and 6, a recess 732 is formed on the upper surface of the beam 731 at the center in the X-axis direction. The bottom surface 733 of the recessed portion 732 constitutes the upper end surface of a portion of the beam portion 731, and is formed into a planar shape parallel to the XY plane. A bottom surface 733 of the recess 732 is arranged below the upper surface 11e of the container 11a (main body) of the power storage element 11 (see FIG. 5). Note that the upper end surface of a portion of the beam portion 731 may be disposed below the upper end of the container 11a of the power storage element 11 (the portion located on the most positive side in the Z-axis direction). Further, the upper end surface of a portion of the beam portion 731 may be arranged flush with the upper surface of the container 11a.

Further, as shown in FIG. 6, a lower end portion of the exhaust member 60 is disposed within the recess 732. Specifically, a convex portion 62 that protrudes downward is formed at a portion of the lower surface of the exhaust member 60 that corresponds to the beam portion 731 . This convex portion 62 is accommodated in a concave portion 732 of the beam portion 731. The exhaust member 60 is positioned with respect to the busbar frame 12 by arranging the convex portion 62 within the concave portion 732 . Further, the strength of the exhaust member 60 is increased by increasing the thickness of the portion where the convex portion 62 is present. Here, it is possible to increase the thickness of the exhaust member 60 by bulging the inner bottom surface, but in this case, the exhaust path 59 becomes narrower, which may impede smooth exhaustion (for example, as shown in FIG. (See the two-dot chain line L5). In this embodiment, by providing the convex portion 62 on the lower surface of the exhaust member 60, the exhaust path 59 is prevented from narrowing even though a portion of the exhaust member 60 is thickened. In particular, in this embodiment, since the recessed portion 732 is provided in the beam portion 731, by making the convex portion 62 protrude further into the recessed portion 732, it is possible to increase the thickness.

In this way, since the bottom surface 733 (upper end surface) of the recessed portion 732, which is a part of the beam portion 731, is arranged below the upper surface 11e of the container 11a of the power storage element 11, a space directly above this portion is secured. Thus, it is possible to thicken a portion of the exhaust member 60. In other words, space efficiency within power storage device 1 is improved. Note that if priority is given to improving the strength of the exhaust member 60, the inner bottom surface of the exhaust member 60 may be bulged.

[4 Guide section]
Next, details of the guide section 80 will be explained. FIG. 7 is a top view showing a schematic configuration of the guide section 80 according to the embodiment.

As shown in FIG. 7, the guide portion 80 is a portion within the first cable path portion 715 that guides one end portion of the positive electrode power cable 31 in a posture inclined with respect to the Y-axis direction. A general-purpose round terminal 311, for example, is attached to one end of the positive power cable 31. This round terminal 311 is screwed together with the connection terminal 19 of the detection line 13a 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 with a nut 312. There is. The guide portion 80 supports one end portion of the positive power cable 31 from the side, thereby guiding the one end portion into a posture inclined with respect to the Y-axis direction.

Here, a case where one end of the positive power cable 31 is arranged in a posture perpendicular to the Y-axis direction, that is, a case in which one end of the positive power cable 31 is arranged in a posture along the X-axis direction. Suppose. The positive power supply cable 31 is thicker and less bendable than the detection line 13a, so if it is arranged with one end perpendicular to the Y-axis direction via the round terminal 311, it will bend as shown by the broken line L2 in FIG. There is a possibility that it may protrude toward the connecting portion 73 side. To allow this, the first holding portion 71 must be made larger in the negative direction of the X-axis, but in this case, the exhaust portion 50 must be made smaller. In other words, the exhaust performance may deteriorate due to the narrowing of the exhaust path 59.

In the present embodiment, the guide portion 80 guides one end of the positive power cable 31 in a posture inclined with respect to the Y-axis direction, so that the positive power cable 31 does not need to be bent sharply. Thereby, the positive power supply cable 31 can be accommodated within the first cable path section 715 without increasing the size of the first holding section 71.

Specifically, the guide portion 80 is provided at the end of the first surrounding wall 712 in the positive direction of the Y-axis. The end of the first surrounding wall 712 in the Y-axis plus direction has a flat first wall 718 parallel to the XZ plane and a flat second wall 719 parallel to the YZ plane. The guide portion 80 is arranged between the first wall 718 and the second wall 719 and connects the first wall 718 and the second wall 719. The guide portion 80 can also be said to be a corner portion provided at the end of the first surrounding wall 712 in the Y-axis positive direction. The guide section 80 connects the power storage element 11 arranged at the end in the Y-axis positive direction among the plurality of power storage elements 11 and the bus bar 13 arranged at the end in the Y-axis positive direction among the first bus bar group 131. It is placed between the two and acts as a barrier. For example, in the unlikely event that one end of the positive power cable 31 comes off from the power storage element 11 or during connection or removal work, the guide portion 80 can prevent one end of the positive power cable 31 from touching the bus bar 13. It can be blocked.

The guide part 80 is a flat wall body, and its flat outer surface 81 supports one end of the positive power supply cable 31 from the side. As a result, one end of the positive power cable 31 is supported in a straight line. Here, the acute angle α between the outer surface 81 of the guide portion 80 and the Y-axis direction is less than 45 degrees. That is, one end portion of the positive power cable 31 guided by the guide portion 80 is also arranged at approximately the same angle with respect to the Y-axis direction. Therefore, when the other end of the positive power cable 31 is pulled in the negative direction of the Y-axis, the moment applied to the connection between the one end of the positive power cable 31 and the power storage element 11 can be reduced.

Furthermore, a locking piece 717 that locks the positive power supply cable 31 is provided in the first cable path portion 715 at a location further in the negative direction of the Y axis than the guide portion 80 . Specifically, the locking piece 717 is arranged on the extension line (broken line L3) of the guide portion 80. The locking piece 717 locks a boundary between a portion of the positive power cable 31 along the Y-axis direction and an inclined portion. When the other end of the positive power cable 31 is pulled in the negative direction of the Y-axis, the locking piece 717 receives part of the tension. Therefore, the moment applied to the connection portion between the one end portion of the positive electrode power cable 31 and the power storage element 11 can be further reduced.

[5 Detection line holding part]
As shown in FIG. 4, one detection line holding section 90 among the plurality of detection line holding sections 90 is arranged near the power storage element 11 arranged at the end in the negative direction of the Y-axis. Further, each of the remaining detection line holding sections 90 is arranged near the power storage element 11 in the negative direction of the Y-axis among the pair of power storage elements 11 connected to one bus bar 13 of the first bus bar group 131. There is. Since the detection line holding sections 90 have generally the same configuration, one detection line holding section 90 will be explained here as an example.

FIG. 8 is a perspective view showing a schematic configuration of the detection line holding section 90 according to the embodiment. FIG. 9 is a cross-sectional view showing a schematic configuration of the detection line holding section 90 according to the embodiment.

As shown in FIGS. 8 and 9, the detection line holding section 90 holds the first detection line 13a1 connected to the power storage element 11 near the detection line holding section 90.

First, the connection terminal 19 of the first detection line 13a1 will be explained. The connection terminal 19 is connected to the tip of the first detection line 13a1. The connection terminal 19 is formed from a sheet metal, and is formed in a stepped shape such that the base portion 191 is located above the tip portion 192. The base 191 is provided with a fixing claw 193 that fixes the tip of the first detection line 13a1. The first detection line 13a1 is fixed by the fixing claw 193 and the base 191 sandwiching the first detection line 13a1. The tip portion 192 of the connection terminal 19 has a hanging portion 194 that continuously hangs down from the tip of the base portion 191, and a mounting portion 195 that extends parallel to the base portion 191 and continues from the tip of the hanging portion 194. There is. The attachment portion 195 is formed in an annular shape in a plan view (viewed in the Z-axis direction), and the electrode terminal (for example, the positive electrode terminal 11b) of the power storage element 11 is inserted into the opening thereof. A nut 115 is screwed onto the positive electrode terminal 11b with the bus bar 13 and the mounting portion 195 passing through it. Thereby, the bus bar 13 and the attachment portion 195 are fixed to the positive electrode terminal 11b. Note that the connection terminal of the second detection line 13a2 is also equivalent to the connection terminal 19 of the first detection line 13a1.

Next, the detection line holding section 90 will be explained in detail. The detection line holding section 90 holds the first detection line 13a1 connected to the power storage element 11 near the detection line holding section 90 and its connection terminal 19. In the following description, among the plurality of first detection lines 13a1, the first detection line 13a1 connected to the power storage element 11 near the detection line holding section 90 is referred to as a connection target line 13b1, and is different from the connection target line 13b1. The other first detection line 13a1 is referred to as a non-target line 13c1.

Specifically, the detection line holding section 90 is arranged above the inner bottom surface of the first cable path section 715 (in the Z-axis positive direction). The detection line holding section 90 has a first wall section 91, a second wall section 92, a third wall section 93, and a spring section 94.

The first wall portion 91 is a portion that supports the base portion 191 of the connection terminal 19 from below. The first wall portion 91 is a flat plate-shaped portion disposed above the inner bottom surface of the first cable route portion 715 and parallel to the inner bottom surface. An opening 715a is formed in a portion of the inner bottom surface of the first cable path section 715 that faces the first wall section 91. Since the inner bottom surface of the first cable path section 715 and the first wall section 91 are separated from each other in the vertical direction, a plurality of asymmetric lines 13c1 are formed in the space formed between the inner bottom surface and the first wall section 91. It is located. At this time, the plurality of asymmetric lines 13c1 span over the opening 715a. On the other hand, the connection terminal 19 of the connection target line 13b1 is placed on the first wall portion 91 and is held above the plurality of non-target lines 13c1. That is, in a plan view (viewed in the Z-axis direction), the connection terminal 19 and at least one of the plurality of asymmetric lines 13c1 are arranged to overlap. The space formed between the inner bottom surface of the first cable route section 715 and the first wall section 91 needs to be large enough to allow at least one asymmetric line 13c1 to overlap the connection terminal 19 of the connection target line 13b1 in plan view. There is.

A pair of regulating protrusions 911 are provided on the upper surface of the first wall portion 91 so as to sandwich the base portion 191 of the connecting terminal 19 in the Y-axis direction. By sandwiching the base portion 191 between the pair of regulating protrusions 911, the connecting terminal 19 is positioned in the Y-axis direction. Further, the hanging portion 194 of the connection terminal 19 is in contact with the end surface of the first wall portion 91 on the power storage element 11 side (the end surface in the positive direction of the X-axis). Thereby, the connection terminal 19 is positioned in the X-axis direction.

The second wall portion 92 is a flat plate-shaped portion provided below the first wall portion 91 and sandwiching the first wall portion 91 in the Y-axis direction. The second wall portion 92 is also a part of the first surrounding wall 712. The second wall portion 92 is arranged at a position corresponding to the end of the first wall portion 91 in the X-axis plus direction. The second wall portion 92 is arranged between the hanging portion 194 of the connection terminal 19 and the asymmetric line 13c1. Thereby, since the second wall portion 92 serves as a barrier, interference between the asymmetric line 13c1 and the connection terminal 19 can be suppressed. Furthermore, during assembly, if the asymmetric line 13c1 is slid along the inner bottom surface of the first cable path section 715 and brought into contact with the second wall section 92, the position overlaps with the connection terminal 19 in plan view. can be reliably placed.

The third wall portion 93 is erected on the upper surface of the first wall portion 91 at an end in the Y-axis positive direction and an end in the X-axis negative direction. That is, the third wall portion 93 is arranged between the positive power cable 31 and the connection terminal 19. Interference between the positive power cable 31 and the connection terminal 19 is prevented by the third wall portion 93 acting as a barrier.

The spring portion 94 is a portion that restricts the connection terminal 19. Specifically, the spring portion 94 includes a pair of leaf springs 941. The pair of leaf springs 941 are arranged above the first wall portion 91 and face each other at a predetermined interval in the Y-axis direction. Each of the pair of leaf springs 941 is a rod-shaped body that hangs down from the upper end of the detection line holding section 90. Each of the pair of leaf springs 941 is inclined so as to approach the other leaf spring 941 as it goes downward. That is, the distance between the pair of leaf springs 941 in the Y-axis direction is narrowest at the lower end and widest at the upper end. During assembly, when the base 191 of the connecting terminal 19 is placed between a pair of leaf springs 941 and lowered along the pair of leaf springs 941, the pair of leaf springs 941 are elastically deformed and the connecting terminal 19 allow for a decline in When the base 191 of the connection terminal 19 passes the lower end portions of the pair of leaf springs 941, the pair of leaf springs 941 return to their original shapes. At this time, the lower ends of the pair of leaf springs 941 are arranged directly above the base 191 of the connection terminal 19. That is, the pair of leaf springs 941 hold the base 191 of the connection terminal 19. As a result, the pair of leaf springs 941 restricts the connection terminal 19 from rising, and the connection terminal 19 is positioned in the vertical direction.

Here, the plurality of detection line holding parts 90 all have the same shape, but the number of asymmetric lines 13c1 arranged in the space formed by the inner bottom surface of the first cable path part 715 and the first wall part 91 is different. . Specifically, as shown in FIG. 4, the detection line holding section 90 furthest from the first cutout 711a, that is, the detection line holding section 90 disposed furthest in the Y-axis positive direction, holds the asymmetric line 13c1 in the space. is not placed. It is possible to increase the number of asymmetric lines 13c1 arranged in the space one by one as one goes further in the negative direction of the Y-axis. In addition, in a location where there are many non-target lines 13c1, all the non-target lines 13c1 may or may not be arranged in the space of one detection line holding section 90.

[6 Explanation of effects]
As described above, according to the power storage device 1 according to the present embodiment, the plurality of power storage elements 11 arranged along the Y-axis direction (predetermined direction) and the plurality of power storage elements 11 are electrically connected to each other. and a plurality of detection lines 13a electrically connected to each of the at least two power storage elements 11 in order to detect the state of at least two of the power storage elements 11. , a busbar frame 12 (busbar holding member) disposed on the plurality of power storage elements 11 and holding the plurality of busbars 13 and the plurality of detection lines 13a, the busbar frame 12 is arranged on the at least two power storage elements 11. Detection in which the connection terminal 19 of the connection target line 13b1 placed near one of the power storage elements 11 and connected to the power storage element 11 is held above the non-target line 13c1 connected to the other power storage element 11. It has a line holding part 90.

According to this, the detection line holding unit 90 holds the connection terminal 19 of the connection target line 13b1 above the non-target line 13c1, so that the connection terminal 19 and the non-target line 13c1 are overlapped in top view. It can be placed as follows. This makes it difficult for the connection terminal 19 and the asymmetric line 13c1 to spread out in a plane and to be disposed, and it is possible to save space.

In particular, in the present embodiment, since the plurality of first detection lines 13a1 and the positive power cable 31 are accommodated in the first cable route section 715, there is a space restriction compared to the second cable route section 725. is large. However, as described above, if the connection terminal 19 and the asymmetric line 13c1 can be arranged in an overlapping manner in a top view, the installation space for the positive power cable 31 within the first cable path section 715 can be secured. .

Further, the detection line holding section 90 holds the connection terminal 19 at a position overlapping the asymmetric line 13c1 when viewed from above.

According to this, since the connection terminal 19 is arranged at a position overlapping the asymmetric line 13c1 in plan view, the connection terminal 19 and the asymmetric line 13c1 can be reliably arranged to overlap. This makes it possible to more reliably save space.

Further, the detection line holding section 90 has a first wall section 91 interposed between the connection terminal 19 of the held connection target line 13b1 and the non-target line 13c1.

According to this, the first wall part 91 of the detection line holding part 90 is interposed between the held connection terminal 19 and the non-target line 13c1, so that the connection terminal 19 is connected to the non-target line 13c1. It is possible to suppress interference with the Therefore, it is possible to prevent the connection terminal 19 from damaging the asymmetric wire 13c1, and it is possible to suppress the occurrence of a short circuit caused by the damage. This eliminates the need to provide a special member for short-circuit prevention, making it possible to further save space.

Further, the detection line holding section 90 has a spring section 94 that restricts the connection terminal 19.

According to this, since the detection line holding portion 90 has the spring portion 94 that restricts the connection terminal 19, the spring portion 94 can suppress displacement of the connection terminal 19.

The detection line holding section 90 also includes a first wall section 91 that restricts the non-target line 13c1 passing below the detection line holding section 90 from above, and a second wall section 91 that restricts the non-target line 13c1 from one side. It has a wall portion 92.

According to this, the first wall part 91 of the detection line holding part 90 restricts the upward movement of the non-target line 13c1, and the second wall part 92 restricts the lateral movement of the non-target line 13c1. Therefore, it is possible to prevent the asymmetric line 13c1 from moving and interfering with the connection terminal 19.

Further, the connection terminal 19 is formed in a stepped shape such that the base 191 is located above the tip 192 connected to the power storage element 11, and the detection line holding portion 90 is connected to the base 191 of the connection terminal 19. is held.

According to this, the connection terminal 19 is formed in a stepped shape, and the base part 191 located above the tip part 192 connected to the power storage element 11 is held by the detection line holding part 90, so that the detection line The space of the asymmetric line 13c1 can be easily formed in the lower part of the holding part 90.

Further, according to the power storage device 1 according to the present embodiment, the plurality of power storage elements 11 arranged along the Y-axis direction (predetermined direction) and the plurality of power storage elements 11 electrically connected to the plurality of power storage elements 11 are arranged along the Y-axis direction (predetermined direction). A busbar 13 , a busbar frame 12 (busbar holding member) that is arranged on the plurality of power storage elements 11 and holds the plurality of busbars 13 , and a A positive power cable 31 (power cable) connected to the busbar frame 12 is provided with a positive power cable 31 (power cable), and the busbar frame 12 is arranged inwardly than the plurality of busbars 13, and the positive power cable 31 is arranged in a posture along the Y-axis direction. The first cable route part 715 has one end part of the positive power supply cable 31 connected to one power storage element 11 in a posture inclined with respect to the Y-axis direction. It has a guide part 80 for guiding.

According to this, if one end of the positive electrode power cable 31 is inclined with respect to the direction in which the plurality of power storage elements 11 are arranged (Y-axis direction), more installation space for the connection structure can be secured than in the case where the positive electrode power cable 31 is arranged perpendicularly, and the positive electrode The amount of bending of the power cable 31 can be reduced. In other words, it is possible to use a general-purpose round terminal 311, for example. In this way, since the busbar frame 12 is provided with the guide portion 80 that guides one end of the positive power cable 31 in a posture inclined with respect to the Y-axis direction, the load on the positive power cable 31 is suppressed, and It is possible to stably hold one end of the positive power cable 31.

Further, the plurality of power storage elements 11 each have a gas exhaust valve 111, and are arranged in such a manner that the gas exhaust valves 111 face the same direction, and the first cable path section 715 has a plurality of bus bars 13 and a plurality of gas discharge valves 111. It is arranged between each gas discharge valve 111 of the power storage element 11 .

According to this, since the first cable route section 715 is arranged between the plurality of bus bars 13 and the respective gas discharge valves 111 of the plurality of power storage elements 11, the positive electrode power supply cable in the first cable route section 715 31 is also placed in a position retracted from the gas exhaust valve 111. Therefore, the positive electrode power cable 31 can be made less likely to be exposed to the gas discharged from the gas exhaust valve 111. Thereby, the burden on the positive electrode power cable 31 during gas discharge can be suppressed.

Further, since the guide portion 80 is planar, one end portion of the positive electrode power cable 31 can be guided in a straight line. Therefore, the burden on the positive power cable 31 can be further suppressed.

Further, the acute angle α between the guide portion 80 and the Y-axis direction is less than 45 degrees.

According to this, since the acute angle α between the guide part 80 and the Y-axis direction is less than 45 degrees, the one end of the positive power cable 31 guided by the guide part 80 is also relative to the Y-axis direction. They are arranged at approximately the same angle. Therefore, when the other end of the positive power cable 31 is pulled, the moment applied to the connection portion between the one end of the positive power cable 31 and the power storage element 11 can be reduced. Therefore, it is possible to stabilize the connection between one end of the positive power cable 31 and the power storage element 11.

Further, the guide portion 80 is arranged between one bus bar 13 out of the plurality of bus bars 13 and one power storage element 11.

According to this, since the guide portion 80 is disposed between one bus bar 13 out of the plurality of bus bars 13 and one power storage element 11, in the unlikely event that one end of the positive power cable 31 is connected to the power storage element 11. Even if it comes off, the guide portion 80 acts as a barrier, and interference with the bus bar 13 and other power storage elements 11 can be suppressed.

Further, according to the power storage device 1 according to the present embodiment, the plurality of power storage elements 11 each having a gas discharge valve 111 and arranged in a posture such that the gas discharge valves 111 face in the same direction, and the plurality of power storage elements 11, and a busbar frame 12 (busbar holding member) that is disposed on the plurality of power storage elements 11 and holds the plurality of busbars 13, and the power storage element 11 includes: The busbar frame 12 includes a container 11a (main body) having a gas discharge valve 111 on the upper surface, and a pair of electrode terminals (positive electrode terminal 11b and negative electrode terminal 11c) arranged on the upper surface of the container 11a. 11 and located on one side of the gas exhaust valve 111; and a second holding part 72 that is located on the plurality of power storage elements 11 and located on the other side of the gas exhaust valve 111. and a beam part 731 that is arranged between at least one pair of adjacent power storage elements 11 among the plurality of power storage elements 11 and connects the first holding part 71 and the second holding part 72. A part of the upper end surface (bottom surface 733) is arranged below or flush with the upper surface 11e of the container 11a.

According to this, since the beam portion 731 is arranged between at least one pair of adjacent power storage elements 11, the gas discharge valve 111 of each power storage element 11 is exposed. Therefore, the beam portion 731 can be prevented from being affected by the gas discharged from the gas exhaust valve 111. Furthermore, since the bottom surface 733 of the beam portion 731 is disposed below or flush with the top surface 11e of the container 11a of the power storage element 11, a space directly above the portion can be secured. Therefore, space efficiency within power storage device 1 can be improved. With these things, it is possible to suppress the influence of gas on the beam portion 731 while increasing the space efficiency within the power storage device 1.

Moreover, the beam portion 731 is arranged between each of the plurality of adjacent pairs of power storage elements 11 .

According to this, since the beam portions 731 are arranged between each of the plurality of adjacent pairs of power storage elements 11, the first holding portion 71 and the second holding portion 72 are connected by the plurality of beam portions 731. There is. Thereby, the rigidity of the busbar frame 12 can be increased. In addition, since the bottom surface 733 of each beam portion 731 is located below or flush with the top surface 11e of the container 11a of the power storage element 11, a space directly above this portion can be secured in each beam portion 731. I can do it. Therefore, space efficiency within power storage device 1 can be further improved.

The power storage device 1 also includes an exhaust member 60 that is disposed on the beam portion 731 of the bus bar frame 12 and forms an exhaust path 59 for gas exhausted from the gas exhaust valve 111.

According to this, since the exhaust member 60 is arranged on the beam portion 731, the exhaust member 60 can protect the beam portion 731 from gas. Therefore, the influence of gas on the beam portion 731 can be further suppressed.

Further, the beam portion 731 has a recess 732 forming the upper end surface of the portion, and the exhaust member 60 is disposed within the recess 732.

According to this, the beam portion 731 is provided with a recess 732 having an upper end surface (bottom surface 733) that is lower or flush with the upper surface 11e of the container 11a of the power storage element 11, and an exhaust member is placed in the recess 732. 60, a part of the exhaust member 60 can be placed closer to the upper surface of the container 11a of the power storage element 11. This allows the exhaust member 60, that is, the exhaust path 59, to be made larger, allowing smooth gas exhaust. Therefore, the increase in temperature within the exhaust member 60 can be further suppressed.

Further, since a part of the exhaust member 60 is disposed within the recess 732 of the beam portion 731, the exhaust member 60 can be positioned by the recess 732.

Further, the power storage device 1 includes a plurality of detection lines 13a for detecting the states of each of the plurality of power storage elements 11, and the first holding section 71 is configured to detect at least one first detection line among the plurality of detection lines 13a. 13a1, and the second holding part 72 has a first cable route part 715 (first detection line route) which is a route of the first detection line 13a1, and the second holding part 72 has a first cable route part 715 (first detection line route) which is a route of the first detection line 13a1. The first detection line 13a1 and the second detection line 13a2 are connected between the first holding part 71 and the second holding part 72. It is arranged to avoid.

According to this, the first detection line 13a1 is arranged within the first cable path section 715, avoiding the space between the first holding section 71 and the second holding section 72. On the other hand, the second detection line 13a2 is arranged within the second cable path section 725, avoiding the space between the first holding section 71 and the second holding section 72. In this way, since the first detection line 13a1 and the second detection line 13a2 are arranged avoiding between the first holding part 71 and the second holding part 72, the first holding part 71 and the second holding part 72 The space between them, that is, the space directly above the beam portion 731 can be further secured.

In addition, since the first detection line 13a1 and the second detection line 13a2 are arranged between the first holding part 71 and the second holding part 72, that is, avoiding the gas discharge valve 111, the gas is discharged from the gas discharge valve 111. The first detection line 13a1 and the second detection line 13a2 can be made less likely to be exposed to the gas.

[7 Description of modification]
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 above embodiment, the guide portion 80 is a corner of the first surrounding wall 712, but the guide portion may be a separate part from the first surrounding wall 712. In this case, the shape of the guide portion can be determined without depending on the first surrounding wall 712. For example, if the guide portion is integrated with the locking piece 717, one end portion of the positive electrode power cable 31 can be supported over a wider range.

Further, in the above embodiment, the acute angle α between the outer surface 81 of the guide portion 80 and the Y-axis direction is less than 45 degrees, but it may be 45 degrees or more.

Further, in the above embodiment, the case where the guide part 80 supports one end of the positive power cable 31 from the side is illustrated, but the guide part 80 may support the round terminal 311 of the positive power cable 31 from the side. .

Further, in the above embodiment, the case where the outer surface 81 of the guide portion 80 is planar is illustrated, but the outer surface of the guide portion may be a concave or convex curved surface. From the viewpoint of absorbing tension when the other end of the positive power cable 31 is pulled, the outer surface of the guide portion is preferably a convex curved surface.

Further, in the above embodiment, the case where the beam portion 731 is arranged between all of the plurality of adjacent pairs of power storage elements 11 is illustrated, but the beam portion is provided between at least one pair of power storage elements 11. That's fine.

Further, in the embodiment described above, the case where the exhaust member 60 is disposed directly above the beam portion 731 is illustrated. However, the member disposed directly above the beam portion 731 may be a member other than the exhaust member 60. Also in this case, since the upper end surface of a part of the beam portion is arranged below or flush with the upper surface 11e of the container 11a of the power storage element 11, a wider installation space for other members can be secured. .

Further, in the above embodiment, the case where the recessed portion 732 is provided in the beam portion 731 is illustrated. However, the beam portion may have a uniform shape over its entire length. In this case, the entire upper surface of the beam portion may be disposed below or flush with the upper surface 11e of the container 11a of the power storage element 11.

Further, in the above embodiment, the connection terminal 19 has a stepped shape, but the connection terminal 19 may have a flat plate shape.

Further, in the above embodiment, the detection line holding section 90 and the detection line locking section 99 have different configurations, but the detection line locking section 99 may have the same configuration as the detection line holding section 90. . In this case, since the space efficiency within the second cable route section 725 is increased, it is also possible to newly accommodate a member different from the second detection line 13a2 within the second cable route section 725.

Further, in the embodiment described above, a case is illustrated in which the detection line 13a is connected to all of the plurality of power storage elements 11. However, for example, in the case of a detection line for temperature detection, the detection line may not be connected to all of the plurality of power storage elements. In other words, the detection line for temperature detection only needs to be electrically connected to each of at least two power storage elements in order to detect the state of at least two power storage elements among the plurality of power storage elements. Specifically, a detection line for temperature detection may be connected only to the power storage elements at both ends and the center power storage element in the Y-axis direction. In this case as well, the detection line holding unit is arranged near one of the at least two electricity storage elements, and connects the connection terminal of the detection line connected to the electricity storage element to the other electricity storage element. It is sufficient to hold it above other detection lines. Also in this case, the connection terminal of the detection line connected to the power storage element and the other detection lines are difficult to spread out in a plane and are difficult to arrange, so it is possible to save space.

FIG. 10 is a sectional view showing a schematic configuration of a detection line holding section 715b according to Modification 1. FIG. 10 is a diagram corresponding to FIG. 9. As shown in FIG. 10, in the detection line holding section 715b, the asymmetric line 13c1 is arranged below the positive power cable 31. In this way, the asymmetric line 13c1 may be arranged below the positive power cable 31. Specifically, at least one non-target line 13c1 is arranged below the detection line holding section 90, and the remaining non-target lines 13c1 are arranged below the positive power cable 31. Thereby, it is possible to suppress floating of the asymmetric line 13c1 in the positive electrode power cable 31.

FIG. 11 is a perspective view of the busbar frame 12b according to Modification 2, showing the vicinity of the guide portion 80. As shown in FIG. 11, a slope portion 89b is provided in the vicinity of the guide portion 80 on the busbar frame 12b. Specifically, the slope portion 89b is disposed on the inner bottom surface of the first cable path portion 715 and near the guide portion 80. More specifically, the slope portion 89b is arranged at a position adjacent to the outer surface 81 of the guide portion 80b. The slope portion 89b is a groove portion extending along the outer surface 81. The positive power cable 31 is accommodated within the slope portion 89b. The bottom surface of the slope portion 89b slopes downward toward the positive electrode terminal 11b. That is, the bottom of the slope portion 89b becomes thinner toward the positive electrode terminal 11b. Since the bottom surface of the slope portion 89b is thus inclined, the angular portion within the slope portion 89b is less likely to come into contact with the positive power cable 31. Therefore, damage to the positive power cable 31 can be suppressed. Furthermore, since the positive power cable 31 is housed within the slope portion 89b, displacement of the positive power cable 31 can also be suppressed. When one end of the positive power cable 31 is accommodated in the slope portion 89b, it assumes a posture inclined with respect to the Y-axis direction. In other words, it can be said that the slope portion 89b is an example of the guide portion according to the present disclosure.

Further, the present invention can be realized not only as the power storage device 1 but also as a busbar frame 12 (busbar holding section) that holds a plurality of busbars.

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 (main body)
11b Positive terminal (electrode terminal)
11c Negative terminal (electrode terminal)
11d Spacer 11e Top surface 12, 12b Busbar frame (busbar holding member)
13 Bus bar 13a Detection line 13a1 First detection line 13a2 Second detection line 13b Connector 13b1 Connection target line 13c1 Non-target line (other detection line)
14 Exterior main body 15 Exterior support 15a Bottom portions 15b, 15c, 17b, 17c Connection portion 16 Board unit mounting portion 17 Exterior lid 17a Top portion 18 Exterior 19 Connection terminal 20 Board unit 30 Cable 31 Positive power cable (power supply cable)
32 Negative power supply cable 50 Exhaust section 51 Exhaust port section 59 Exhaust path 60 Exhaust member 61 Hole section 62 Convex section 65 Cover member 71 First holding section 72 Second holding section 73 Connecting section 80 Guide section 81 Outer surface 89b Slope section 90 Detection Wire holding part 91 First wall part 92 Second wall part 93 Third wall part 94 Spring part 99 Detection line locking part 100 Board accommodating part 111 Gas discharge valves 115, 312 Nuts 131 First bus bar group 132 Second bus bar group 191 Base part 192 Tip part 193 Fixed claw 194 Hanging part 195 Mounting part 200 Board 311 Round terminal 711 First outer wall part 711a, 711b First cutout 712 First surrounding wall 713 First partition wall 714 First partition part 715 First cable route part (Cable route section, first detection line route)
715a Opening 715b Detection line holding section 717 Locking piece 718 First wall 719 Second wall 721 Second outer wall 721a Second notch 722 Second surrounding wall 723 Second partition wall 724 Second partition 725 Second cable route section (Second detection line path)
731 Beam portion 732 Recessed portion 733 Bottom surface (upper end surface)
911 Regulating protrusion 941 Leaf spring L2 Broken line L3 Broken line L5 Double-dot chain line α Angle

Claims (5)

a plurality of power storage elements arranged along a predetermined direction;
a plurality of bus bars electrically connected to the plurality of power storage elements;
A plurality of detection lines electrically connected to each of the at least two power storage elements to detect the state of at least two of the plurality of power storage elements;
a busbar holding member disposed on the plurality of power storage elements and holding the plurality of busbars and the plurality of detection lines;
The bus bar holding member is arranged near one of the at least two power storage elements, and connects a connection terminal of a detection line connected to the power storage element to another detection line connected to another power storage element. It has a detection line holding part that is held above the
The detection line holding section holds the connection terminal at a position overlapping the other detection line when the connection terminal is viewed from above.
Power storage device. a plurality of power storage elements arranged along a predetermined direction;
a plurality of bus bars electrically connected to the plurality of power storage elements;
A plurality of detection lines electrically connected to each of the at least two power storage elements to detect the state of at least two of the plurality of power storage elements;
a busbar holding member disposed on the plurality of power storage elements and holding the plurality of busbars and the plurality of detection lines;
The bus bar holding member is arranged near one of the at least two power storage elements, and connects a connection terminal of a detection line connected to the power storage element to another detection line connected to another power storage element. It has a detection line holding part that is held above the
In the power storage device, the detection line holding section has a first wall section interposed between the connection terminal of the held detection line and the other detection line . The power storage device according to claim 1 or 2 , wherein the detection line holding section includes a spring section that restricts the connection terminal. The detection line holding section includes a first wall section that restricts the other detection line passing below the detection line holding section from above, and a second wall section that restricts the other detection line from one side. The power storage device according to any one of claims 1 to 3 , comprising: The connection terminal is formed in a stepped shape such that a base is located above a tip connected to the electricity storage element,
The power storage device according to any one of claims 1 to 4 , wherein the detection line holding section holds the base of the connection terminal.

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