JP2015069811A - Power storage device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power storage device capable of maintaining a relative position between a termination member and a coupling member at a proper position even if the termination member and the coupling member are fastened by a screw member.SOLUTION: A power storage device includes a power storage element, a termination member, a coupling member and a screw member. The coupling member has a connection part overlapped on the termination member, and a beam part extending from the connection part. The connection part has a first abutting part provided at a position separated from an insertion position of a shaft part of the screw member. The termination member has a second abutting part with which the first abutting part abuts from the rotation direction of the screw member.

Description

  The present invention relates to a power storage device including a power storage element, a termination member arranged alongside the power storage element, and a connecting member coupled to the termination member.

  As one of general power storage devices, a power storage element, a termination member arranged side by side with the power storage element, and a connecting member connected to the termination member in a direction in which the power storage element and the termination member are aligned Some are provided with an extending connecting member. The connecting member includes a connection portion that is overlapped with the termination member, and a beam portion that extends from the connection portion. In this type of power storage device, the termination member and the connecting portion are fastened by a screw member because of assembly.

  Along with this, each of the termination member and the connection portion is provided with an insertion portion through which the screw member is inserted. The screw member has a shaft portion and a head portion connected to the proximal end of the shaft portion. The shaft portion is screwed into the nut or the tapped hole. In addition, a nut may be welded to a connection part.

  The termination member and the connection portion are overlapped at a position where the insertion portion of the termination member that fastens the termination member and the connection portion matches the insertion portion of the connection portion. And a beam part is arrange | positioned in a predetermined | prescribed appropriate position. The screw member is inserted into the insertion portion of the terminal member and the insertion portion of the connection portion, and the shaft portion of the screw member is screwed into the nut or the tap hole. Thereby, a termination | terminus member and a connection part are pinched | interposed between the head of a screw member, and a nut, and a termination | terminus member and a connection part are fastened (refer patent document 1).

  When the termination member and the connection portion are fastened in this way, the rotational torque of the screw member may act on the connection portion, and the connecting member (connection portion) may rotate together with the screw member. When the connecting portion rotates together with the screw member, the beam portion extending from the connecting portion also rotates around the axial center of the shaft portion of the screw member, and when the connecting portion deviates from a predetermined appropriate position, the connecting member constitutes the power storage device. This may hinder the placement of other members or other devices adjacent to the power storage device.

JP 2012-146657 A

  Therefore, in view of such circumstances, the present invention provides a power storage device that can maintain the relative position between the terminal member and the connecting member at an appropriate position even if the terminal member and the connecting member are fastened by the screw member. This is the issue.

  A power storage device according to the present invention includes a power storage element, a termination member arranged side by side with the power storage element, and a coupling member coupled to the termination member, the coupling element extending in a direction in which the power storage element and the termination member are aligned. A screw member that fastens the member and the termination member and the coupling member, and includes a screw member having a shaft portion, the coupling member including a connection portion superimposed on the termination member, and a beam portion extending from the connection portion The screw member fastens the termination member and the connection portion in a state where the termination member and the connection portion are inserted in the overlapping direction, and the connection portion is at a position separated from the insertion position of the shaft portion of the screw member. The termination member has a second contact portion that contacts the first contact portion from the rotation direction of the screw member.

  According to this structure, when the connection part of a termination member and a connection member is piled up, the 1st contact part of a connection part and the 2nd contact part of a termination member engage. For this reason, the connection portion to be rotated by the rotational torque of the screw member is prevented from rotating by the first contact portion engaging with the second contact portion of the terminal member from the rotation direction of the screw member. Do not rotate with the screw member. Therefore, the relative position between the terminal member and the connecting member is not shifted from the proper position, and is maintained at the proper position. Therefore, the connection member does not hinder the arrangement of other members constituting the power storage device or other devices adjacent to the power storage device.

  Here, as one aspect of the power storage device according to the present invention, the first contact portion and the second contact portion may be engaged with each other.

  If it does in this way, the connection part which is going to rotate with the rotational torque of a screw member will be reliably prevented from rotating, when the 1st contact part carries out uneven engagement with the 2nd contact part of a termination member. .

  As another embodiment of the power storage device according to the present invention, the material of the first contact portion or the second contact portion may be a metal.

  If it does in this way, the 1st contact part or the 2nd contact part can be processed with high accuracy. Therefore, the first contact portion and the second contact portion are engaged at a more accurate position, and the terminal member and the connecting member are prevented from rotating at the accurate position.

  As described above, according to the power storage device of the present invention, the relative position between the termination member and the coupling member can be maintained at an appropriate position even if the termination member and the coupling member are fastened by the screw member. Has an effect.

FIG. 1 is an overall perspective view of a battery module according to an embodiment of the present invention. FIG. 2 is an overall perspective view of the frame of the battery module according to the embodiment. FIG. 3 is a vertical cross-sectional view of a main part in which a portion where the end plate and the connecting member in the frame are fastened is cut in the X direction. FIG. 4 is a vertical cross-sectional view of a main part in which a portion where the end plate and the connecting member in the frame are fastened is cut in the Y direction. FIG. 5 is a main part longitudinal cross-sectional view in which a portion where the end plate and the connection member are fastened in the frame is cut in the Y direction, and a main part vertical cross-sectional view showing a process of inserting the connection member between the pair of end plates. It is. FIG. 6 is a vertical cross-sectional view of the main part of the frame where the end plate and the connecting member are fastened together in the Y direction, and shows a state in which the first contact part is engaged with the protruding part. FIG. FIG. 7 is a cross-sectional view of an essential part of a frame of a battery module according to another embodiment of the present invention, in which a portion where an end plate and a connecting member are fastened is cut. FIG. 8 is a vertical cross-sectional view of the main part of the frame of the battery module according to another embodiment of the present invention, in which a portion where the end plate and the connecting member are fastened is cut in the X direction. FIG. 9 is a cross-sectional view of an essential part of a frame of a battery module according to another embodiment of the present invention, in which a portion where an end plate and a connecting member are fastened is cut. FIG. 10 is a vertical cross-sectional view of a main part of a frame of a battery module according to another embodiment of the present invention, in which a portion where an end plate and a connecting member are fastened is cut in the Y direction.

  Hereinafter, a battery module which is an embodiment of a power storage device according to the present invention will be described with reference to the accompanying drawings. As shown in FIG. 1, the battery module according to the present embodiment includes a battery cell (storage element) 1, a spacer 2 arranged side by side with the battery cell 1, and a frame that holds the battery cell 1 and the spacer 2. 3.

  The battery module has a plurality of battery cells 1. The plurality of battery cells 1 are arranged in a line in the first direction X. Each battery cell 1 is a rectangular battery that is flat in the first direction X. Each battery cell 1 includes an electrode body (not shown) including a positive electrode and a negative electrode which are insulated from each other, a case 11 in which the electrode body is accommodated, and an external terminal 12 provided on the upper surface of the case 11. .

  The spacer 2 is disposed between the adjacent battery cells 1. The spacer 2 forms a flow path between cases 11 of adjacent battery cells 1. Furthermore, the spacers 2 are respectively disposed on both sides of the plurality of battery cells 1 aligned in a line in the first direction X. That is, the spacer 2 is also disposed between the case 11 of the battery cell 1 and the end plate 4 of the frame 3. The spacer 2 also forms a flow path between the case 11 of the battery cell 1 and the end plate 4. A cooling medium flows through these flow paths, and the cooling medium flows along the side surface of the case 11 of the battery cell 1 to cool the battery cell 1.

  In the following, for convenience, the first direction is referred to as the X direction (X-axis direction among the orthogonal axes shown in each drawing), and the second direction orthogonal to the first direction is referred to as the Y-direction (shown in each drawing). The third direction orthogonal to the first direction and the second direction is referred to as the Z direction (the Z axis direction of the orthogonal axes shown in each drawing).

  As shown in FIGS. 1 and 2, the frame 3 includes an end plate (terminating member) 4 arranged side by side with a plurality of battery cells 1 and a plurality of spacers 2, and a connecting member 5 connected to the end plate 4. And the connecting member 5 extended in the direction where the battery cell 1 and the end plate 4 are located in a line, and the screw member 6 which fastens the end plate 4 and the connecting member 5 are provided. The connecting member 5 includes a connection portion 7 that is overlaid on the end plate 4, and a beam portion 8 that extends from the connection portion 7. The materials of the end plate 4 and the connecting member 5 are both metals, specifically, hot dip galvanized steel sheet (SGCC).

  The frame 3 includes a pair of end plates 4. The pair of end plates 4 are disposed on both sides of the plurality of battery cells 1 and the plurality of spacers 2 in the first direction X. That is, the pair of end plates 4 sandwich the plurality of battery cells 1 and the plurality of spacers 2. The frame 3 includes a plurality of connecting members 5. Each connecting member 5 is connected to each of the pair of end plates 4. The plurality of connecting members 5 according to this embodiment are inserted between the pair of end plates 4. Further, the connecting member 5 is disposed so as to extend from the four corners of the end plate 4 in a direction orthogonal to the end plate 4.

  Therefore, a rectangular frame is formed on the upper surface of the frame 3 by the upper ends of the pair of end plates 4 and the upper surfaces of the pair of connecting members 5 (the beam portions 8 thereof). Further, a rectangular frame is formed on the lower surface of the frame 3 by the lower ends of the pair of end plates 4 and the lower surfaces of the pair of connecting members 5 (the beam portions 8). On the side surface facing the Y direction of the frame 3, a rectangular frame is formed by the side ends of the pair of end plates 4 and the side surfaces of the pair of connecting members 5 (the beam portions 8 thereof). Each connecting member 5 is connected to the end plate 4 so that the surfaces of the pair of connecting members 5 (the beam portions 8) constituting these frames are flush with each other.

  The pair of end plates 4 both have the same shape and the same structure. The four connecting members 5 have the same shape and the same structure. Accordingly, the single end plate 4 and the single connecting member 5 will be described below.

  As shown in FIGS. 3 and 4, the end plate 4 is in contact with the end plate body 41 and the second contact where the connecting member 5 (the first contact portion 72) contacts from the rotation direction A of the screw member 6. Part 42. The material of the second contact portion 42 is metal.

  The end plate body 41 is formed in a thin plate shape, and is formed in a substantially square shape corresponding to the shape of the case 11 on the YZ plane. The end plate main body 41 has a first surface 41a facing the battery cell 1 and a second surface 41b opposite to the first surface 41a.

The end plate main body 41 has a planar second connection surface 43 (the first connection surface 73 will be described later) and an insertion portion 44 through which the screw member 6 is inserted. The second connection surface 43 and the insertion portion 44 are provided in a region where the connecting member 5 in the end plate body 41 is connected. As shown in FIGS. 2 and 3, the second connection surface 43 is provided on the first surface 41 a side of the end plate body 41. The second connection surfaces 43 are provided at the four corners of the end plate 4 (hereinafter, one second connection surface 43 of the four second connection surfaces 43 of the end plate 4 will be described. ). The second connection surface 43 is a region on the first surface 41 a where the connection portion 7 of the connecting member 5 is in surface contact. The insertion portion 44 is a through hole that penetrates the end plate main body 41 in the X direction.

  The second contact portion 42 is provided on the first surface 41a. More specifically, the second contact portion 42 is a protruding portion 42 (hereinafter referred to as a second contact portion) that protrudes from the first surface 41 a of the end plate body 41 in the axial direction B of the shaft portion 61 of the screw member 6. This will be described using the same reference numeral 42 as the contact portion. In other words, the second contact portion 42 is a protruding portion 42 that protrudes in the insertion center direction.

  As shown in FIGS. 2 to 4, the protrusion 42 is formed to bulge toward the first surface 41 a. The shape of the protrusion 42 viewed from the first surface 41a side is substantially circular. The protruding portion 42 is provided on the second connection surface 43 at a position farthest from the axis C of the shaft portion 61 of the screw member 6 inserted through the insertion portion 44. That is, the protrusion 42 is provided at a position farthest from the insertion position on the second connection surface 43. The protruding portion 42 has a top portion 42a and a side surface 42b. The side surface 42b abuts on the connecting portion 7 (the side surface 71c thereof). The protruding amount of the protruding portion 42 from the end plate main body 41 to the top portion 42a is set to such a height that the connecting portion 7 that slides on the second connecting surface 43 does not get over by the rotational torque of the screw member 6. .

  A part of the side surface 42 b faces at least the side surface 71 c of the connecting portion 7. The side surface 42 b intersects the second connection surface 43, and more preferably is orthogonal to the second connection surface 43. Moreover, the area | region which opposes the connection part 7 at least among the side surfaces 42b has a circular-arc-shaped curved surface in the circumferential direction.

  As illustrated in FIGS. 2 and 3, the screw member 6 includes a shaft portion 61. Specifically, the screw member 6 is a (through) bolt 6 (hereinafter described using the same reference numeral 6 as the screw member). The bolt 6 includes a shaft portion 61 and a head portion 62 connected to the base end of the shaft portion 61. A nut 9 is screwed onto the tip end side of the shaft portion 61. The nut 9 is welded to the connection portion 7. Therefore, the nut 9 is fixed to the connecting portion 7. The screw member 6 is inserted into the end plate 4 and the connecting portion 7 from the direction in which the end plate 4 and the connecting portion 7 are overlapped, and fastens the end plate 4 and the connecting portion 7.

  The connection part 7 is provided at both ends of the beam part 8 in the X direction. The connecting portion 7 extends from the beam portion 8 in a direction substantially orthogonal (Y direction). The connection part 7 positions the plurality of battery cells 1 and the plurality of spacers 2 in the X direction. The connection portion 7 includes a connection portion main body 71 and a first contact portion 72 provided at a position separated from the insertion position of the shaft portion 61 of the screw member 6. The material of the first contact portion 72 is metal.

  The connection part main body 71 is formed in a flat plate shape. The connection portion main body 71 has a first surface 71a facing the end plate 4, a second surface 71b opposite to the first surface 71a, and a side surface 71c. The first surface 71 a and the second surface 71 b are formed in a planar shape and are surfaces that are orthogonal to the axis C of the shaft portion 61 of the screw member 6. The side surface 71c is a surface that intersects the first surface 71a and the second surface 71b. The side surface 71 c is a surface along the axial direction B of the shaft portion 61 of the screw member 6.

  As shown in FIG. 3, the connection portion main body 71 includes a planar first connection surface 73 that is superimposed on the second connection surface 43 of the end plate main body 41, and an insertion portion 74 through which the screw member 6 is inserted. Have As shown in FIG. 2, the first connection surface 73 is a surface that is in surface contact with the second connection surface 43 of the end plate 4, and is provided on the first surface 71 a of the connection portion main body 71. The insertion part 74 is a through hole that penetrates the connection part main body 71 in the X direction.

  The first contact portion 72 is provided on the side surface 71c. The first contact portion 72 is a recess that is recessed on the side surface 71c. Specifically, the first contact portion 72 is recessed in the radial direction of the shaft portion 61 of the bolt 6 (direction perpendicular to the shaft core C) and in the direction approaching the shaft core C of the shaft portion 61. It is a recess.

  The shape of the concave portion of the first contact portion 72 corresponds to the shape of the side surface 42 b of the protruding portion 42. That is, the cross-sectional shape of the concave surface of the first contact portion 72 cut in the axial direction B of the shaft portion 61 is opposed to the first contact portion 72 on the side surface 42b of the protruding portion 42 cut in the same direction. The shape is the same as the cross-sectional shape of the region. Specifically, the shape of the concave portion of the first contact portion 72 is an arc shape, and more specifically, a semicircular shape.

  The first contact portion 72 engages with the projecting portion (second contact portion) 42 (in the radial direction of the shaft portion 61). The protrusion 42 is fitted into the first contact portion 72, and the side surface 42 b of the protrusion 42 is in surface contact with the recess of the first contact portion 72, so that the first contact portion 72 and the protrusion 42. Engage with no gap.

  The beam portion 8 is provided in the X direction in which the pair of end plates 4, the plurality of battery cells 1, and the plurality of spacers 2 are arranged. The cross-sectional shape of the beam portion 8 cut in the Y direction is L-shaped, and the beam portion 8 has a first plate-like portion and a second plate-like portion having an elongated flat surface. The first plate portion and the second plate portion are orthogonal to each other.

  The battery module according to the present embodiment is as described above. Then, the manufacturing method of a battery module is demonstrated, referring an accompanying drawing.

  First, the plurality of battery cells 1 and the plurality of spacers 2 are arranged in the same alignment state as when completed as shown in FIG. The plurality of battery cells 1 and the plurality of spacers 2 in this state are sandwiched between the pair of end plates 4 and 4 from both sides in the alignment direction (X direction), and are further pressurized in the same direction, so that the plurality of batteries The cell 1, the plurality of spacers 2, and the pair of end plates 4, 4 are brought into close contact with each other. Thereafter, the pair of connecting members 5 and 5 are inserted between the pair of end plates 4 and 4 from the Y direction or the Z direction so that the connection portions 7 are positioned at the four corners of the pair of end plates 4 and 4.

  Specifically, as shown in FIG. 5, the connecting member 5 is inserted between the pair of end plates 4, 4 from the Y direction (the direction of arrow D in FIG. 5), and the first contact portion 72 is In a state where the first connection surface 73 of the connection portion 7 and the second connection surface 43 of the end plate 4 overlap each other until the protrusion (second contact portion) 42 is engaged with the projections and recesses, the connection portion 7 is Slide on the second connection surface 43 of the end plate 4 in the Y direction.

  Then, as shown in FIG. 6, when the first abutting portion 72 is engaged with the protrusion 42 in a concavo-convex manner, the first connecting surface 73 of the connecting portion 7 and the second connecting surface 43 of the end plate 4 are completely connected. The insertion portion 44 of the end plate 4 and the insertion portion 74 of the connection portion 7 coincide with each other. At this time, the connecting member 5 is positioned so as to be in an appropriate position. Specifically, the connecting member 5 is positioned at a position where the first plate-like portion and the second plate-like portion of the beam portion 8 are substantially vertical or substantially horizontal. A frame is formed on the frame 3 by the end portions of the pair of end plates 4, 4 and the beam portions 8, 8 of the pair of connecting members 5, 5, and a pair of first plates of each beam portion 8 in the frame. Or the pair of second plate portions are flush with each other.

  Thereafter, the bolt 6 is inserted from the X direction into the insertion portion 44 of the end plate 4 and the insertion portion 74 of the connection portion 7, and by rotating the bolt 6 around the axis C of the shaft portion 61 of the bolt 6, The bolt 6 is screwed into the nut 9 arranged on the inner side (the second surface 71b side) of the connection portion 7, and the end plate 4 and the connection portion 7 are fastened.

  At this time, the connection portion 7 that is to be rotated by the rotational torque of the bolt 6 is prevented from rotating when the first abutting portion 72 is engaged with the protruding portion 42. For this reason, the connection part 7 is fixed in the predetermined position of the end plate 4, and the beam part 8 does not incline. That is, the pair of first plate-like portions or the pair of second plate-like portions of each beam portion 8 in the frame 3 remains flush with each other. The frame 3 assembled in this way integrally holds the plurality of battery cells 1 and the plurality of spacers 2. And a large capacity and high voltage battery (battery module) is completed.

  As described above, according to the battery module according to the present embodiment, when the connection portion 7 of the end plate 4 and the connecting member 5 is overlapped, the first contact portion 72 of the connection portion 7 and the protruding portion of the end plate 4. (Second contact portion) 42 is engaged. For this reason, the connection part 7 which is going to rotate by the rotational torque of the bolt 6 is prevented from rotating when the first abutting part 72 is engaged with the protruding part 42 of the end plate 4 from the rotational direction B of the bolt 6. And does not rotate with the bolt 6. Therefore, the relative position between the end plate 4 and the connecting member 5 is not deviated from the proper position, and can be maintained at the proper position.

  That is, the pair of first plate-like portions or the pair of second plate-like portions of each beam portion 8 in the frame formed on the frame 3 is maintained in a state of being flush with each other, and the connecting member 5 does not interfere with the arrangement of other members constituting the battery module or other devices adjacent to the battery module. Therefore, the air supply duct and the exhaust duct can be brought into close contact with each beam portion 8 of the connecting member 5 to supply cooling air, and the control module placed on the upper surface of the connecting member 5 does not tilt, and the battery module Even when the device itself is placed, the entire battery module does not tilt.

  Further, the connection portion 7 that is to be rotated by the rotational torque of the bolt 6 is reliably prevented from rotating by the first contact portion 72 engaging with the protrusion 42 of the end plate 4 in an uneven manner.

  Moreover, since the material of the 1st contact part 72 or the protrusion part (2nd contact part) 42 is a metal, the 1st contact part 72 or the protrusion part 42 can be processed with a high precision. Therefore, the first contact portion 72 and the protruding portion 42 are engaged at a more accurate position, and the end plate 4 and the connecting member 5 are prevented from rotating at the accurate position.

  Further, when the end plate 4 and the connecting portion 7 are fastened by the bolt 6, the rotational torque of the bolt 6 around the axis C of the shaft portion 61 is applied to the connecting portion 7, and the protruding portion 42 of the end plate 4 and The first contact portion 72 of the connecting portion 7 engages at a position farthest from the axis C of the shaft portion 61. Therefore, the force applied to the protruding portion 42 can be kept low compared to the case where the protruding portion 42 is engaged with the first contact portion 72 at another position of the end plate 4. Therefore, the protrusion 42 can be formed also on the end plate 4 formed of a material having low strength. In addition, the force applied to the first contact portion 72 can be suppressed to a lower level than when the first contact portion 72 is engaged with the protruding portion 42 at another position of the connecting portion 7. Therefore, the first contact portion 72 can also be formed on the connection portion 7 formed of a low strength material.

  Note that the power storage device according to the present invention is not limited to the above-described embodiment, and it is needless to say that various modifications can be made without departing from the gist of the present invention. Of course, any of the configurations, methods, and the like according to the modifications described below may be arbitrarily selected and employed in the configurations, methods, and the like according to the above-described embodiments.

  In the said embodiment, although the end plate 4 was the termination | terminus member which concerns on this invention, it is not limited to this. For example, the termination member may be a spacer 2 disposed between the battery cell 1 and the end plate 4. That is, the second contact portion 42 may be provided on the spacer 2.

  Moreover, in the said embodiment, although the end plate 4 and the connection member 5 were the hot dip galvanized steel plates, it is not limited to this. For example, the material of the termination member and the connecting member may be a metal such as copper, SUS, or aluminum, or may be a resin. Moreover, the termination | terminus member and the connection member may process the nickel plating steel plate and the tin plating steel plate.

  Moreover, in the said embodiment, although the screw member 6 was the through bolt 6, it is not limited to this. Specifically, the screw member has a shaft portion in which a male screw is formed on the peripheral surface. The screw member may be any member as long as the terminal member and the connecting member are fastened by rotating around the shaft core of the shaft portion and screwing the screw member into the nut. For example, the screw member includes a machine screw.

  The screw member may be a screw bolt. Specifically, the screw member has a shaft portion in which a male screw is formed on the peripheral surface. The screw member may be one in which the terminal member and the connecting member are fastened by rotating around the shaft core of the shaft portion and screwing the screw member into the member in which the tap hole is formed.

  Furthermore, the screw member may be a stud. Specifically, the screw member has a shaft portion in which screws are formed on the peripheral surfaces at both ends in the axial direction. The screw member is rotated about the shaft core of the shaft portion, and one end of the shaft portion is screwed to the member having the tapped hole, and a nut is screwed to the other end of the shaft portion, thereby connecting the terminal member and the screw member. The member may be fastened.

  Moreover, in the said embodiment, although the end plate 4 and the connection part 7 overlapped the surfaces which face a X direction, it is not limited to this. For example, as shown in FIG. 7, the (first) connecting portions 107 of the end plate (terminating member) 4 and the connecting member 5 may be superposed on the surfaces facing in the Y direction.

  In this case, the end plate 4 includes an end plate main body 41 and a second connection portion 145 that is superimposed on the (first) connection portion 107. The second connection portion 145 is formed to be orthogonal to the end plate body 41. The second connection portion 145 has a protruding portion (second contact portion) 42.

  The connecting member 5 includes a first connecting portion 107 that is overlapped with the second connecting portion 145 of the end plate 4, and a beam portion 108 that extends from the first connecting portion 107. The first connection portion 107 has a connection surface 73 (corresponding to the first connection surface in the above-described embodiment) superimposed on the second connection portion 145 of the end plate 4. The beam portion 108 extends from one end of the first connection portion 107 in a direction along the connection surface 73 (X direction). The first connection portion 107 has a first contact portion 72. The first connecting portion 107 and the second connecting portion 145 are also provided with insertion portions 44 and 74 through which the screw member 6 is inserted.

  For this reason, the screw member 6 is inserted through the insertion portion 44 of the second connection portion 145 and the insertion portion 74 of the first connection portion 107 from the Y direction, with the axis C of the shaft portion 61 of the screw member 6 as the center. By rotating the screw member 6, the screw member 6 is screwed into the nut 9 disposed on the inner side (second surface 71 b side) of the first connection portion 107, and the first connection portion 107 and the second connection portion 107. The connection part 145 is fastened. At this time, the first connecting portion 107 to be rotated by the rotational torque of the screw member 6 is prevented from rotating by the first contact portion 72 engaging with the protruding portion 42. For this reason, the 1st connection part 107 is fixed in the predetermined position of the end plate 4, and the beam part 108 does not incline.

  Moreover, in the said embodiment, although the connection part 7 was arrange | positioned inside a pair of end plate 4, it is not limited to this. For example, as illustrated in FIG. 8, the connection portion 7 may be disposed on the outer side (second surface 41 b side) of the pair of end plates 4. Further, as shown in FIG. 9, the first connection portion 107 may be disposed outside the second connection portion 145 (on the second surface 41 b side) of the pair of end plates 4.

  Moreover, in the said embodiment, the shape seen from the 1st surface 41a side of the protrusion part 42 was formed in the substantially circular shape. However, it is not limited to this. For example, the protrusion may be formed in an annular shape, or may be a protrusion that protrudes from the end plate body 41 in a linear or curved shape.

  Moreover, in the said embodiment, the 1st contact part 72 of the connection part 7 is the direction orthogonal to the axial center C of the axial part 61 of the volt | bolt 6, and is a concave shape recessed in the direction away from this axial center C. The protruding portion (second abutting portion) 42 of the end plate 4 protrudes in a direction orthogonal to the axis C of the shaft portion 61 of the bolt 6 and away from the axis C. It was a convex part. However, it is not limited to this. For example, as shown in FIG. 10, the first contact portion 272 of the connecting portion 7 is a convex convex portion, and the side surface 242b of the protruding portion (second contact portion) 242 of the end plate 4 is concave. It may be a recess.

  Moreover, in the said embodiment, the insertion part 44 was a through-hole. However, it is not limited to this. For example, the insertion portion may be a notch portion in which a portion including the insertion position of the shaft portion of the screw member is notched.

  Moreover, in the said embodiment, the nut 9 was welded to the connection part 7, and was being fixed. However, it is not limited to this. For example, the nut 9 may not be fixed to the connection portion 7.

  Moreover, in the said embodiment, although the electrical storage element was the battery cell 1, it is not limited to this. For example, the storage element may be various secondary batteries, other primary batteries, or capacitors such as electric double layer capacitors. And the kind and magnitude | size (capacity | capacitance) of an electrical storage element are arbitrary.

  DESCRIPTION OF SYMBOLS 1 ... Battery cell (electric storage element), 2 ... Spacer, 3 ... Frame, 4 ... End plate (terminating member), 5 ... Connection member, 6 ... Bolt (screw member), 7 ... Connection part, 8 ... Beam part, 9 ... Nut, 11 ... Case, 12 ... External terminal, 41 ... End plate body, 41a ... First surface, 41b ... Second surface, 42 ... Protrusion (second contact portion), 42a ... Top, 42b ... Side 43 ... second connection surface 44 ... insertion portion 61 ... shaft portion 62 ... head portion 71 ... connection portion body 71a ... first surface 71b ... second surface 71c ... side surface 72 ... first 73 ... first connection surface, 74 ... insertion portion, 107 ... first connection portion, 108 ... beam portion, 145 ... second connection portion, 242 ... projection portion (second contact portion) ) 242b ... side surface, 272 ... first contact portion, A ... rotational direction of the bolt (B), axial direction of the axial center of the bolt shaft portion, ... axial center, (connecting member) D ... insertion direction, X ... first direction, Y ... second direction, Z ... third direction

Claims (3)

A storage element;
A termination member arranged side by side with the electricity storage element;
A connecting member connected to the terminal member, the connecting member extending in a direction in which the power storage element and the terminal member are aligned;
A screw member for fastening the terminal member and the connecting member, the screw member having a shaft portion;
The connecting member has a connection portion that is overlaid on the termination member, and a beam portion that extends from the connection portion,
The screw member fastens the termination member and the connection portion in a state where the termination member and the connection portion are inserted in a superimposed direction,
The connection portion has a first contact portion provided at a position spaced from the insertion position of the shaft portion of the screw member,
The power storage device, wherein the termination member includes a second contact portion that contacts the first contact portion from a rotation direction of the screw member. The power storage device according to claim 1, wherein the first contact portion and the second contact portion engage with each other in a concave-convex manner. The power storage device according to claim 1, wherein a material of the first contact portion or the second contact portion is a metal.

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