JP6131815B2 - Power storage device - Google Patents

Description

  The present invention relates to a power storage device.

  Patent Document 1 discloses a battery power line connection structure, in which a positive electrode power supply terminal and a negative power supply terminal are provided with notches having different shapes, and a positive battery connection terminal and a negative battery connection terminal are provided. On the other hand, a hole that can be fitted into the notch is formed. This prevents the positive electrode battery connection terminal and the negative electrode battery connection terminal from being connected with different polarities and prevents the battery connection terminal from turning when connecting.

JP 2001-93510 A

  By the way, in patent document 1, although the shape of the terminal was changed in order to prevent an incorrect assembly | attachment at the time of a connection with an external terminal (external connection line), the incorrect assembly | attachment of a terminal is prevented in the middle of the manufacturing process of an electrical storage apparatus. No countermeasure has been proposed. Unlike Patent Document 1, the positive electrode terminal and the negative electrode are also provided when the positive electrode power supply terminal (hereinafter referred to as positive terminal) and the negative power supply terminal (hereinafter referred to as negative terminal) have the same shape. The material (metal) used for the terminal is often different. For example, when the power storage device is a lithium ion battery, in many cases, the positive electrode terminal is made of aluminum or an aluminum alloy, and the negative electrode terminal is made of copper or a copper alloy. That is, it has been necessary to take measures against incorrect assembly when assembling the terminals with respect to the positive and negative electrode terminals arranged on the left and right of the power storage device.

  An object of the present invention is to provide a power storage device that can prevent a terminal from rotating and prevent erroneous assembly of the terminal in a manufacturing process.

In a power storage device that solves the above problem, a case in which an electrode assembly is accommodated, a positive electrode terminal that protrudes from the case and has a recess having a female screw for fixing a bus bar at the tip, and protrudes from the case And a negative electrode terminal provided with a recess having a female screw for fixing the bus bar at the tip thereof, and a non-rotating fitting portion is formed together with the female screw in the concave portion of the positive electrode terminal, and An anti-rotation fitting portion is formed in the concave portion of the negative electrode terminal together with the female screw, and the orientation of the anti-rotation fitting portion of the positive electrode terminal and the anti-rotation fitting portion of the negative electrode terminal is changed in a plane. The gist is that the shape has been changed .

According to this, since the fitting part for rotation prevention with a female screw is formed in the recessed part of a positive electrode terminal, and the fitting part for rotation prevention with a female screw is formed in the recessed part of a negative electrode terminal, these fitting parts are Can be used to stop the terminal. Moreover, since the shape is changed by changing the orientation in the plane between the fitting portion of the positive electrode terminal and the fitting portion of the negative electrode terminal, it is possible to prevent erroneous assembly of the terminals in the manufacturing process.

In a power storage device that solves the above problem, a case in which an electrode assembly is accommodated, a positive electrode terminal that protrudes from the case and has a recess having a female screw for fixing a bus bar at the tip, and protrudes from the case And a negative electrode terminal provided with a recess having a female screw for fixing the bus bar at the tip thereof, and a non-rotating fitting portion is formed together with the female screw in the concave portion of the positive electrode terminal, and An anti-rotation fitting portion is formed in the concave portion of the negative electrode terminal together with the female screw , and at least one of the anti-rotation fitting portion of the positive electrode terminal and the anti-rotation fitting portion of the negative electrode terminal in a longitudinal section. The gist is that the depth of the part is changed.

In the power storage device, a jig may be fitted to the fitting portion for preventing rotation of the positive electrode terminal and the fitting portion for preventing rotation of the negative electrode terminal.
According to this, it is possible to prevent erroneous assembly when the terminal is supported by the jig.

  In the above power storage device, the jig is fitted to a fitting portion for preventing rotation of the positive electrode terminal and a fitting portion for preventing rotation of the negative electrode terminal when the positive electrode terminal and the negative electrode terminal are fastened to the case. It should be a good match.

According to this, when the positive terminal and the negative terminal are fastened to the case, it is possible to prevent erroneous assembly when the terminal is supported by the jig.
In the power storage device, a positive terminal nut that is screwed into a male screw portion formed on the outer peripheral surface of the positive electrode terminal and fastens the positive electrode terminal to the case, and a male screw portion formed on the outer peripheral surface of the negative electrode terminal. It is good to have a nut for negative electrode terminals screwed in and fastening the negative electrode terminal to the case.

  According to the present invention, it is possible to prevent the terminal from rotating, and to prevent erroneous assembly of the terminal in the manufacturing process.

The disassembled perspective view which shows the secondary battery of embodiment. The perspective view which shows the external appearance of the secondary battery of embodiment. Sectional drawing which shows the terminal part of a secondary battery. The top view of a secondary battery. The disassembled perspective view which shows the state and jig | tool which screw a nut to each pole part. Sectional drawing which shows the terminal part of a secondary battery. The perspective view of a secondary battery. The perspective view which shows a battery pack. (A) is a schematic plan view which shows the secondary battery of another example, (b) is a schematic sectional drawing in the AA of (a). (A) is a schematic plan view which shows the secondary battery and jig | tool of another example, (b) is a schematic sectional drawing in the AA of (a). (A) is a schematic plan view which shows the secondary battery of another example, (b) is a schematic sectional drawing in the AA of (a). (A) is a schematic plan view which shows the secondary battery and jig | tool of another example, (b) is a schematic sectional drawing in the AA of (a). The top view of the secondary battery for a comparison.

Hereinafter, an embodiment in which the power storage device is embodied as a secondary battery will be described with reference to FIGS.
In the drawings, the horizontal plane is defined by the orthogonal X and Y directions, and the vertical direction is defined by the Z direction.

  As shown in FIGS. 1 to 3, in the secondary battery 10, an electrode assembly 20 and an electrolytic solution (not shown) are accommodated in a metal case 11. The case 11 includes a rectangular parallelepiped case main body 12 having an upper surface opening and a rectangular flat plate-shaped lid 13 that closes the opening of the case main body 12. The case main body 12 and the lid body 13 are both made of metal (for example, stainless steel or aluminum), and the case main body 12 and the lid body 13 are joined by laser welding. Further, the secondary battery 10 of the present embodiment is a square battery whose outer periphery forms a square shape, and is a lithium ion battery.

  The electrode assembly 20 includes a positive electrode 21, a negative electrode 22, and a separator that insulates the positive electrode 21 from the negative electrode 22. The positive electrode 21 includes a positive electrode active material on both surfaces of a positive metal foil (aluminum foil). The negative electrode 22 includes a negative electrode active material on both surfaces of a negative electrode metal foil (copper foil). The electrode assembly 20 has a laminated structure in which a plurality of positive electrodes 21 and a plurality of negative electrodes 22 are alternately laminated, and a separator is interposed between the two electrodes.

  The positive electrode 21 has a positive current collecting tab 23 on a part of one side (long side), and the negative electrode 22 has a negative current collecting tab 24 on a part of one side (long side). The plurality of positive electrodes 21 are stacked such that the respective positive electrode current collecting tabs 23 are arranged in a row along the stacking direction. Similarly, the plurality of negative electrode electrodes 22 are stacked such that the respective negative electrode current collecting tabs 24 are arranged in a row along the stacking direction so as not to overlap the positive electrode current collecting tabs 23. The electrode assembly 20 includes a positive electrode tab group 25 formed by collecting positive electrode current collecting tabs 23. At least the outermost positive electrode current collecting tab 23 of the positive electrode tab group 25 is welded to the positive electrode conductive member 26, and the positive electrode tab group 25 becomes a connection portion to the positive electrode terminal 30 in the electrode assembly 20. The electrode assembly 20 includes a negative electrode tab group 27 formed by collecting the negative electrode current collecting tabs 24. At least the outermost negative electrode current collecting tab 24 of the negative electrode tab group 27 is welded to the negative electrode conductive member 28, and the negative electrode tab group 27 serves as a connection portion to the negative electrode terminal 31 in the electrode assembly 20.

  A positive electrode terminal 30 as an electrode terminal is welded to the positive electrode conductive member 26, and a negative electrode terminal 31 as an electrode terminal is welded to the negative electrode conductive member 28. Each of the positive electrode terminal 30 and the negative electrode terminal 31 has a cylindrical pole column portion 40 and a base portion 41 having a square plate shape. A pole post 40 is erected from the center of the base 41. A male screw portion 42 is provided on the outer peripheral surface of the pole column portion 40.

  As shown in FIGS. 1 and 3, a resin terminal cover 50 is attached to the base 41 of the positive electrode terminal 30 and the negative electrode terminal 31. Further, an O-ring 51 is provided on the base portion 41 so as to surround the pole column portion 40. The terminal cover 50 electrically insulates the lid 13 of the case 11 from the positive terminal 30 and the negative terminal 31, and electrically insulates the case body 12 from the positive terminal 30 and the negative terminal 31. . Furthermore, the electrode assembly 20 is electrically insulated from the positive electrode terminal 30 and the negative electrode terminal 31 by the terminal cover 50.

  The pole column portions 40 of the positive electrode terminal 30 and the negative electrode terminal 31 protrude (exposure) from the inside of the case 11 through the through hole 14 of the lid body 13 and above the lid body 13. The inner peripheral surface of the through hole 14 and the outer peripheral surface of the pole column part 40 are insulated by an insulating member 52. The insulating member 52 has a cylindrical portion 53 and a flange portion 54 provided at one end edge in the axial direction of the cylindrical portion 53. The cylindrical portion 53 is interposed between the inner peripheral surface of the through hole 14 and the outer peripheral surface of the polar column portion 40. The flange portion 54 is locked around the through hole 14 on the outer surface of the lid 13 of the case 11.

  A positive terminal nut 55 is screwed into the male threaded portion 42 of the pole column 40 of the positive terminal 30. Similarly, a negative terminal nut 56 is screwed into the male thread portion 42 of the pole column portion 40 of the negative electrode terminal 31. Further, the flange portion 54 of the insulating member 52 is sandwiched between the outer surface of the lid body 13 of the case 11 and the nuts 55 and 56, and the nut portions 55 and 56 and the lid body 13 are insulated by the flange portion 54. Yes. Further, the flange portion 54 of the insulating member 52, the lid 13 of the case 11, the O-ring 51 and the terminal cover 50 are sandwiched between the nuts 55 and 56 and the base portion 41, and the positive terminal 30 and the negative terminal 31 are It is fixed to the lid 13 of the case 11.

  A recess 43 having an internal thread 43 a for fastening the bus bar 60 is formed at the tip of the pole column portion 40 of the positive electrode terminal 30 and the negative electrode terminal 31. As shown in FIG. 3, the recess 43 having the female screw 43 a opens to the upper surface of the pole column portion 40 and has a predetermined depth in the axial direction of the pole column portion 40.

  As described above, the secondary battery 10 of the present embodiment is provided with the case 11 in which the electrode assembly 20 is housed, and the recess 43 that protrudes from the case 11 and has the female screw 43a for fixing the bus bar 60 to the tip. And a negative electrode terminal 31 protruding from the case 11 and provided with a recess 43 having a female screw 43a for fixing the bus bar 60 at the tip. Specifically, as shown in FIG. 8, a battery pack 200 is configured by a plurality of secondary batteries 10, and a positive electrode terminal 30 of the secondary battery 10 and a negative electrode terminal 31 of the adjacent secondary battery 10 are connected via a bus bar 60. It is connected.

  As shown in FIG. 1, the bus bar 60 that electrically connects the secondary batteries 10 has a rectangular plate shape and includes a pair of insertion portions 61. The bus bar 60 is fixed to the pole column portions 40 of the positive terminal 30 and the negative terminal 31 by bolts 62. The bolt 62 has a fixing male screw portion 63 that is screwed into the female screw 43 a of the concave portion 43, and a head portion 64 at one end in the axial direction of the fixing male screw portion 63.

Below, the structure in connection with prevention of misassembly of the positive electrode terminal 30 and the negative electrode terminal 31 in the secondary battery 10 of this embodiment is demonstrated in detail.
As shown in FIGS. 4 and 5, the concave portion 43 of the pole column portion 40 of the positive electrode terminal 30 is formed with a fitting portion 70 for preventing rotation together with the female screw 43 a. The fitting portion 70 includes a round hole 76 provided in the opening of the recess 43 and a pair of notches (grooves) 71 and 72. Each of the notches 71 and 72 has a vertical cross-sectional shape and opens on the upper surface of the pole column portion 40, and has a predetermined depth in the axial direction of the pole column portion 40. Each of the notches 71 and 72 has a rectangular shape as a planar shape, and extends so as to be continuous from the round hole 76 in the Y direction. That is, the notch 71 has one end opened to the round hole 76 and extends from the center of the round hole 76 to the right side in FIG. 4, and the notch 72 has one end opened to the round hole 76 and round. 4 extends from the center of the hole 76 to the left side in FIG.

  Similarly, in the concave portion 43 of the pole column portion 40 of the negative electrode terminal 31, a fitting portion 73 for preventing rotation is formed together with the female screw 43a. The fitting portion 73 includes a round hole 77 provided in the opening of the recess 43 and a pair of notches (grooves) 74 and 75. Each of the notches 74 and 75 has a vertical cross-sectional shape and is open on the upper surface of the pole column 40 and has a predetermined depth in the axial direction of the pole column 40. Each of the notches 74 and 75 has a rectangular shape as a planar shape, and extends continuously from the round hole 77 in the X direction. That is, one end of the notch 74 opens into the round hole 77 and extends upward in FIG. 4 from the center of the round hole 77, and one end of the notch 75 opens into the round hole 77. 4 extends downward from the center of the hole 77 in FIG.

  In this manner, the anti-rotation fitting portion 70 of the positive electrode terminal 30 and the anti-rotation fitting portion 73 of the negative electrode terminal 31 are asymmetric. Specifically, the anti-rotation fitting portion 70 of the positive electrode terminal 30 and the anti-rotation fitting portion 73 of the negative electrode terminal 31 have different orientations in the plane, thereby making the shape different and asymmetric. It has become. In other words, the fitting portion 70 for preventing rotation of the positive electrode terminal 30 and the fitting portion 73 for preventing rotation of the negative electrode terminal 31 are oriented in a plane, with one (notches 71 and 72) in the Y direction and the other ( By making the notches 74 and 75) extend in the X direction, the orientation (phase) on the plane is changed to be asymmetric.

  As shown in FIG. 5, jigs 100 and 110 are used when attaching the positive terminal 30 and the negative terminal 31. The jig 100 and the jig 110 are fixed to each other by a fixing tool T at the upper end side, and the lower end side is inserted and engaged with the positive electrode terminal 30 and the negative electrode terminal 31. Specifically, the jig 100 has a cylindrical portion 101 and two blade portions 102 and 103. The cylindrical part 101 is used in an upright state and is inserted into the round hole 76 of the positive electrode terminal 30. The blade portions 102 and 103 have a flat plate shape, and project radially from the outer peripheral surface of the cylindrical portion 101 at the lower portion of the cylindrical portion 101. The two blade portions 102 and 103 are provided at positions shifted by 180 degrees. The two blade portions 102 and 103 are inserted into the notches 71 and 72 when the cylindrical portion 101 is inserted into the round hole 76 of the positive electrode terminal 30.

  The jig 110 has a cylindrical portion 111 and two blade portions 112 and 113. The cylindrical portion 111 is used in an upright state and is inserted into the round hole 77 of the negative electrode terminal 31. The blade portions 112 and 113 have a flat plate shape and project radially from the outer peripheral surface of the cylindrical portion 111 at the lower portion of the cylindrical portion 111. The two blade portions 112 and 113 are provided at positions shifted by 180 degrees. The two blade portions 112 and 113 are inserted into the notches 74 and 75 when the cylindrical portion 111 is inserted into the round hole 77 of the negative electrode terminal 31.

  Thus, the pole column part 40 of the positive electrode terminal 30 and the negative electrode terminal 31 is provided with the part (fitting part 70, 73) with which the jig | tool 100,110 engages, as shown to FIG. When the jigs 100 and 110 are inserted, the jigs 100 and 110 are engaged.

Next, the manufacturing method of the secondary battery 10 will be described together with the operation.
As shown in FIG. 5, the base 41 of the positive electrode terminal 30 and the negative electrode terminal 31 is welded to the positive electrode conductive member 26 and the negative electrode conductive member 28 to integrate the positive electrode conductive member 26 and the positive electrode terminal 30, and the negative electrode conductive member 28. And the negative electrode terminal 31 are integrated. Then, the positive electrode conductive member 26 is welded to the positive electrode tab group 25 of the electrode assembly 20, and the negative electrode conductive member 28 is welded to the negative electrode tab group 27 of the electrode assembly 20. Subsequently, the O-ring 51 and the terminal cover 50 are attached to the positive terminal 30 and the negative terminal 31. Subsequently, the lid 13 is placed on the terminal cover 50, the pole column portion 40 is inserted into the through hole 14, and the insulating member 52 is interposed between the inner peripheral surface of the through hole 14 and the outer peripheral surface of the polar column portion 40. Interpose. In this state, the pole column portions 40 of the terminals 30 and 31 protrude from the lid body 13 through the through holes 14 of the lid body 13 of the case.

  Next, as shown in FIG. 6, jigs 100 and 110 are inserted into the respective pole column parts 40 of the positive electrode terminal 30 and the negative electrode terminal 31, and the jigs 100 and 110 are engaged with the fitting parts 70 and 73. . Then, the nuts 55 and 56 are screwed into the male screw portion 42 of the pole column portion 40 in a state where both the jigs 100 and 110 are prevented from rotating with a tool or the like (not shown). At the time of this screwing, the positive electrode terminal 30 and the negative electrode terminal 31 try to rotate with the nuts 55 and 56, but at each engagement location, the positive electrode terminal 30 and the negative electrode terminal 31 are stopped by the jigs 100 and 110 that are prevented from rotating. Is prevented from rotating (following).

As a result, the positive terminal 30 and the negative terminal 31 are fixed to the lid 13 of the case 11 by the nuts 55 and 56.
When the terminals 30 and 31 are assembled, the anti-rotation fitting portion 70 of the positive electrode terminal 30 and the anti-rotation fitting portion 73 of the negative electrode terminal 31 are asymmetric. Assembly is prevented.

explain in detail.
FIG. 13 is a comparative example. As shown in FIG. 13, the positive and negative terminals 30 and 31 arranged on the left and right of the case lid 13 are the same. Compared with this case, in FIG. 4, the orientations (phases) of the notches (grooves) 71 and 72 and the notches (grooves) 74 and 75 are different between the positive electrode terminal 30 and the negative electrode terminal 31. Thereby, when misassembled, jigs 100 and 110 cannot be assembled, and misassembly can be detected.

  That is, as shown in FIG. 13, when the notch is provided in the same direction (with the same phase) when the notch is provided so as to have the function of preventing the terminal from rotating, the positive electrode terminal is formed in the terminal assembling process. If the negative electrode terminal is reversed, or if the same component is used for the positive electrode terminal and the negative electrode terminal, the jig can be assembled, so that erroneous assembly may occur. On the other hand, in the present embodiment shown in FIG. 4, the jigs 100 and 110 are assembled when the positive electrode terminal and the negative electrode terminal are reversed in the terminal assembling process or when the same component is used for the positive electrode terminal and the negative electrode terminal. I can't. Therefore, it is possible to recognize an incorrect assembly.

  Subsequently, after the jigs 100 and 110 are removed from the pole column portion 40, the electrode assembly 20 is accommodated in the case body 12, and the lid 13 is joined to the case body 12 to form the case 11. The battery 10 is assembled.

  After that, when the battery pack 200 is manufactured by connecting a plurality of secondary batteries 10 as shown in FIG. 8, the fixing male screw portion 63 of the bolt 62 is screwed into the female screw 43 a of the concave portion 43, and the head portion 64. As a result, the bus bar 60 is pressed toward the distal end surface of the polar column portion 40, and the periphery of the insertion portion 61 is pressed against the distal end surface of the polar column portion 40. Then, the bus bar 60 is fixed to the positive electrode terminal 30 and the negative electrode terminal 31 by the bolts 62, and the secondary batteries 10 are electrically connected to each other by the bus bar 60, and the battery pack 200 is manufactured.

According to the above embodiment, the following effects can be obtained.
(1) As a configuration of the secondary battery 10 as a power storage device, a fitting portion 70 for preventing rotation is formed in the recess 43 of the positive terminal 30 together with the female screw 43a, and the rotation is stopped together with the female screw 43a in the recess 43 of the negative terminal 31. For this reason, the fitting portion 73 for the positive electrode terminal 30 and the fitting portion 73 for the negative electrode terminal 31 are made asymmetric. As a result, the fitting portion 70 for preventing rotation together with the female screw 43a is formed in the concave portion 43 of the positive terminal 30, and the fitting portion 73 for preventing rotation is formed together with the female screw 43a in the concave portion 43 of the negative electrode terminal 31. These terminals 70 and 73 can be used to prevent the terminals 30 and 31 from rotating. Moreover, since the fitting part 70 of the positive electrode terminal 30 and the fitting part 73 of the negative electrode terminal 31 are asymmetrical, the incorrect assembly | attachment of the terminals 30 and 31 in a manufacturing process can be prevented.

(2) By making the fitting part 70 for preventing rotation of the positive electrode terminal 30 and the fitting part 73 for preventing rotation of the negative electrode terminal 31 different from each other in a plane, it can be easily made asymmetric.
(3) Since the fitting portion 70 for preventing rotation of the positive electrode terminal 30 and the fitting portion 73 for preventing rotation of the negative electrode terminal 31 are made different in shape by changing the direction (phase) in the plane, it is easy to The shape can be different.

  (4) The jigs 100 and 110 are fitted into the fitting portion 70 for preventing rotation of the positive electrode terminal 30 and the fitting portion 73 for preventing rotation of the negative electrode terminal 31. According to this, erroneous assembly can be prevented when the terminals 30 and 31 are supported by the jigs 100 and 110.

  (5) When the positive electrode terminal 30 and the negative electrode terminal 31 are fastened to the case 11, the jigs 100 and 110 are a fitting portion 70 for preventing rotation of the positive electrode terminal 30 and a fitting portion 73 for preventing rotation of the negative electrode terminal 31. To be fitted. According to this, when the positive electrode terminal 30 and the negative electrode terminal 31 are fastened to the case 11, erroneous assembly can be prevented when the terminals 30 and 31 are supported by the jigs 100 and 110.

  (6) A positive terminal nut 55 that is screwed into the male screw portion 42 formed on the outer peripheral surface of the positive electrode terminal 30 and fastens the positive electrode terminal 30 to the case 11, and a male screw portion 42 formed on the outer peripheral surface of the negative electrode terminal 31. And a negative terminal nut 56 for fastening the negative terminal 31 to the case 11. As a result, the nut can be easily fastened.

The embodiment is not limited to the above, and may be embodied as follows, for example.
As shown in FIG. 9, a regular hexagonal hole (groove) 81 is provided in the opening of the recess 43 of the positive electrode terminal 30 in plan view, and a regular hexagonal hole is provided in the opening of the recess 43 of the negative electrode terminal 31 in plan view. (Groove) 83 is provided, and the direction of the hexagonal hole 81 and the hexagonal hole 83 are different in plan view. That is, the hexagonal hole 81 as a fitting part for rotation prevention is formed in the concave part 43 of the positive terminal 30 together with the female screw 43a, and the hexagonal hole 83 as a fitting part for rotation prevention is formed in the concave part 43 of the negative electrode terminal 31. Is formed.

  As shown in FIG. 10, the positive electrode jig 120 and the negative electrode jig 123 are used when the terminals 30 and 31 are fastened by the nuts 55 and 56. The positive electrode jig 120 has a hexagonal column portion 121 that fits into the hexagonal hole 81 of the positive electrode terminal 30. Similarly, the negative electrode jig 123 has a hexagonal column portion 124 that fits into the hexagonal hole 83 of the negative electrode terminal 31.

  -It is good also as asymmetrical by changing the depth H1 of the hexagon socket 91 and the depth H2 of the hexagon socket 93 in FIG. Specifically, the opening of the concave portion 43 of the positive electrode terminal 30 has a regular hexagonal hole (groove) 91 in plan view, and the opening of the concave portion 43 of the negative electrode terminal 31 has a regular hexagonal hole (groove) 93 in plan view. The hexagonal hole 91 and the hexagonal hole 93 are in the same direction in plan view, but the depths H1 and H2 are different. More specifically, the depth H2 of the hexagonal hole 93 is deeper than the depth H1 of the hexagonal hole 91. That is, a hexagonal hole 91 is formed in the concave portion 43 of the positive terminal 30 as a fitting portion for preventing rotation together with the female screw 43a, and a hexagonal hole 93 as a fitting portion for preventing rotation is formed in the concave portion 43 of the negative terminal 31 together with the female screw 43a. Is formed.

  As shown in FIG. 12, the positive electrode jig 130 and the negative electrode jig 133 are used when the terminals 30 and 31 are fastened by the nuts 55 and 56. The positive electrode jig 130 has a hexagonal column portion 131 that fits into the hexagonal hole 91 of the positive electrode terminal 30. Similarly, the negative electrode jig 133 has a hexagonal column portion 134 that fits into the hexagonal hole 93 of the negative electrode terminal 31. In this way, the depth H1 of the hexagonal hole 91 and the depth H2 of the hexagonal hole 93 are changed, and the jigs (bars) 130 and 133 are inserted into the hexagonal holes (fitting portions) 91 and 93 during assembly. In this manner, the depths into which the jigs (bars) 130 and 133 are inserted are confirmed (measured). In the case of FIG. 12, the depth at which the jigs (bars) 130 and 133 enter is deeper by a predetermined amount ΔH than the depth at which the jigs (bars) 130 enter. Thereby, the incorrect assembly | attachment of the terminal in a manufacturing process can be prevented.

  In other words, the hexagonal hole (fitting part) 91 for preventing rotation of the positive electrode terminal 30 and the hexagonal hole (fitting part) 93 for preventing rotation of the negative electrode terminal 31 have depths of at least some portions in the longitudinal section ( It can also be made asymmetric by changing H1, H2).

  As described above, the fitting portions for preventing rotation and preventing misassembly use the notches (71, 72, 74, 75) in FIG. 4, but instead, as shown in FIGS. Polygonal holes (81, 83, 91, 93) or the like can be used. Specifically, in the case of a polygonal hole (hexagonal holes 81, 83) as shown in FIG. 9, the phases (directions) of the hexagonal holes (fitting parts) 81, 83 are changed by the positive and negative terminals 30, 31. Alternatively, in the case of polygonal holes (hexagonal holes 91, 93) as shown in FIG. 11, the hole depths of the hexagonal holes 91, 93 are changed by the positive and negative terminals 30, 31. In addition, in the case of a polygonal hole (hexagonal hole), the size (size) of the hole may be changed between the positive and negative terminals 30 and 31. Specifically, the two-surface width W1 of the hexagonal holes 81 and 83 in FIG. 9 is changed.

  In FIGS. 9 and 10, hexagonal holes 81 and 83 are formed in the openings of the recesses 43 of the terminals 30 and 31, but polygonal holes (hexagonal holes and the like) are formed on the bottom surfaces of the recesses 43 of the terminals 30 and 31. Also good. Similarly, in FIGS. 11 and 12, hexagonal holes 91 and 93 are formed in the openings of the recesses 43 of the terminals 30 and 31, but polygonal holes (hexagonal holes and the like) are formed on the bottom surfaces of the recesses 43 of the terminals 30 and 31. May be.

  In FIGS. 3, 4, 5, and 6, the round holes 76 and 77 into which the jigs 100 and 110 are inserted and the notches 71, 72, 74, and 75 are formed above the female screw 43a. Instead of providing 76 and 77, an internal thread may be formed from the tip of the terminal, and a notch may be provided in the upper part of the internal thread. Thus, the structure which a female screw and a fitting part partially overlap may be sufficient.

  Although the case where the terminals 30 and 31 are fastened to the case lid 13 by nut fastening has been described, for example, when the case main body 12 and the lid 13 are welded, the lid 13 is deformed by welding heat. In order to prevent this, it is possible to suppress deformation of the lid 13 by performing welding in a state in which a jig is fitted to the fitting portions provided in the terminals 30 and 31.

  More specifically, after assembling the terminals 30 and 31 to the case lid 13, in a process in which the lid body 13 is distorted due to a welding process between the case body 12 and the lid body 13, a jig is used in FIG. A jig (pin) is inserted and positioned in the fitting part 73 of the terminal 31 on one side, and the jig is inserted in the fitting part 70 of the terminal 30 on one side and is slid in the Y direction (right direction in FIG. 4). Thus, the rotation of the lid body 13 due to strain generated during welding or the like can be restricted.

  In addition, for example, when a liquid injection port for injecting an electrolytic solution is provided at a position shifted from the center instead of the center of the lid 13 of the case, when the liquid injection port is tightened with a nut or with a blind rivet The fitting portions 70 and 73 may be used when assembling. Specifically, a wrong assembly can be detected by inserting a jig when assembling other parts of the secondary battery. Further, when the battery pack (module) is assembled, the fitting parts 70 and 73 may detect erroneous assembly. Further, the secondary battery carrying jig or the assembling jig (of other parts) may not be properly assembled unless the fitting parts 70 and 73 are fitted.

The terminals 30 and 31 are nut-fastened to the case lid 13, but the terminals 30 and 31 may be fixed to the case lid 13 by caulking.
The power storage device may be embodied as a nickel hydride secondary battery or an electric double layer capacitor.

  DESCRIPTION OF SYMBOLS 10 ... Secondary battery, 11 ... Case, 20 ... Electrode assembly, 30 ... Positive electrode terminal, 31 ... Negative electrode terminal, 43 ... Recessed part, 43a ... Female screw, 55 ... Nut, 56 ... Nut, 70 ... Fitting part, 73 ... Fitting part, 81 ... hexagonal hole, 83 ... hexagonal hole, 91 ... hexagonal hole, 93 ... hexagonal hole, 100 ... jig, 110 ... jig, 120 ... jig, 123 ... jig, 130 ... jig, 133 …jig.

Claims (5)

A case in which the electrode assembly is accommodated, and
A positive terminal provided with a recess protruding from the case and having a female screw for fixing the bus bar at the tip;
A negative electrode terminal protruding from the case and provided with a recess having an internal thread for fixing the bus bar at the tip;
In a power storage device comprising:
An anti-rotation fitting portion is formed together with the female screw in the concave portion of the positive electrode terminal, and an anti-rotation fitting portion is formed in the concave portion of the negative electrode terminal along with the female screw,
A power storage device , wherein the fitting portion for preventing rotation of the positive electrode terminal and the fitting portion for preventing rotation of the negative electrode terminal have different shapes by changing directions in a plane .   A case in which the electrode assembly is accommodated, and
  A positive terminal provided with a recess protruding from the case and having a female screw for fixing the bus bar at the tip;
  A negative electrode terminal protruding from the case and provided with a recess having an internal thread for fixing the bus bar at the tip;
In a power storage device comprising:
  An anti-rotation fitting portion is formed together with the female screw in the concave portion of the positive electrode terminal, and an anti-rotation fitting portion is formed in the concave portion of the negative electrode terminal along with the female screw,
  The power storage device according to claim 1, wherein a depth of at least a part of a vertical section of the fitting portion for preventing rotation of the positive electrode terminal and a fitting portion for preventing rotation of the negative electrode terminal are changed. 3. The power storage device according to claim 1, wherein a jig is fitted into the fitting portion for preventing rotation of the positive electrode terminal and the fitting portion for preventing rotation of the negative electrode terminal. The jig engages with a fitting portion for preventing rotation of the positive electrode terminal and a fitting portion for preventing rotation of the negative electrode terminal when the positive electrode terminal and the negative electrode terminal are fastened to the case. The power storage device according to claim 3 . A positive terminal nut that is screwed into a male screw portion formed on the outer peripheral surface of the positive terminal and fastens the positive terminal to the case;
The negative terminal is threaded to the male screw portion formed on an outer circumferential surface of the negative terminal to any one of claims 1 to 4, characterized in that it has a negative electrode terminal nut for fastening to the case The power storage device described.