JP6191430B2 - Power storage device manufacturing apparatus and power storage device manufacturing method - Google Patents

Description

  The present invention relates to a power storage device manufacturing apparatus in which an electrode terminal is fixed to a lid, and a power storage device manufacturing method.

  Vehicles such as EVs (Electric Vehicles) and PHVs (Plug in Hybrid Vehicles) are equipped with secondary batteries as power storage devices that store the power supplied to the driving motor. As a secondary battery, there is one in which an electrode assembly is accommodated in a case, and the case is formed by welding a case main body and a lid (for example, see Patent Document 1).

  As shown in FIG. 8, in the power storage device disclosed in Patent Document 1, the electrode assembly 100 is accommodated in a case 110, and the case 110 includes a case body 111 and a lid body 112 that closes an opening of the case body 111. Is provided. The electrode assembly 100 includes a positive electrode tab group 101 in which positive electrode tabs are collected, and a positive electrode conductive member 102 is connected to the positive electrode tab group 101. The electrode assembly 100 includes a negative electrode tab group 103 in which negative electrode tabs are collected, and a negative electrode conductive member 104 is connected to the negative electrode tab group 103.

  The conductive members 102 and 104 of each pole are bent into an L-shaped cross section after the plate-like conductive members 102 and 104 are welded to the tab groups 101 and 103 of each pole. For this reason, the tab groups 101 and 103 of each pole are bent toward one end side in the stacking direction of the electrode assembly 100 and then bent toward the other end side. With this structure, the tab groups 101 and 103 can be connected to the conductive members 102 and 104 above the electrode assembly 100 with a small dead space. A positive electrode terminal 107 is connected to the positive electrode conductive member 102, and a negative electrode terminal 108 is connected to the negative electrode conductive member 104. The electrode terminals 107 and 108 are attached to the lid body 112 in a state of protruding from the lid body 112.

  One method of manufacturing a secondary battery is to integrate an electrode assembly and a lid in advance, insert the electrode assembly into the case body, and then weld the lid to the case body. In this method, the pole column provided in the electrode terminal of each pole is inserted into an insertion hole formed in the lid, and a nut is screwed into the pole column protruding from the lid. Then, after the electrode terminal is fastened to the lid, the electrode assembly is accommodated in the case body in a state where the lid and the electrode assembly are integrated, and then the lid body and the case body are joined, and the secondary battery Is manufacturing.

JP 2013-161756 A

  However, in Patent Document 1, the tab groups 101 and 103 are bent, and the electrode terminals 107 and 108 are connected to the tab groups 101 and 103. For this reason, the electrode terminals 107 and 108 are in a state of rising from the end surface of the electrode assembly 100 where the tab groups 101 and 103 are provided. That is, the electrode terminals 107 and 108 are in a state in which their axial directions extend in the vertical direction from the end surfaces where the tab groups 101 and 103 are provided. Therefore, in the above manufacturing method, when the electrode terminals 107 and 108 are attached to the lid body 112 with nuts or the like, if a downward pressing force (axial direction) is applied to the electrode terminals 107 and 108, the pressing force is The electrode assembly 100 is added to the electrode assembly 100 via the tab groups 101 and 103 and the conductive members 102 and 104, and a load is applied to the electrode assembly 100.

  An object of the present invention is to provide a power storage device manufacturing apparatus and a power storage device manufacturing method capable of suppressing the load applied to the electrode assembly when the electrode terminal is fixed to the lid.

An apparatus for manufacturing a power storage device for solving the above-described problem is a method for manufacturing a power storage device for positioning an electrode terminal connected to an electrode assembly via a tab and fixing the positioned electrode terminal to a case member. An apparatus, wherein the electrode assembly can be supported in a horizontally mounted state in which the tab extends in the horizontal direction, and the electrode terminal can be supported in a state in which the axial direction of the electrode terminal extends in the vertical direction. It comprises a base face, and the gist that you fix the electrode terminals supported on the base face to the case member.

  According to this, when fixing an electrode terminal to a case member, an electrode assembly is supported on a support surface. In this state, the tab is in a state extending in the horizontal direction, and the electrode terminal can be supported on the pedestal surface in a state where the tab is not folded back. For this reason, the electrode terminal is supported by the pedestal surface in a direction different from the horizontal direction in which the tab extends. Then, when the case member is placed on the electrode terminal supported on the pedestal surface and the electrode terminal is fixed to the case member, a pressing force accompanying fixation is applied toward the case member and the electrode terminal along the axial direction of the electrode terminal. The electrode assembly is retracted from the direction in which the pressing force is applied, and a load due to the pressing force is suppressed from being applied to the electrode assembly.

A method of manufacturing a power storage device for solving the above problems includes an electrode assembly in which electrodes of different poles are alternately stacked in a state of being insulated from each other, a case for housing the electrode assembly, A tab side end surface of the electrode assembly formed by collecting one side in the laminating direction, a tab group protruding from the tab side end surface near one end in the laminating direction, and a tab group folded to the other end side in the laminating direction; A conductive member joined to a tab at one end in the stacking direction of the tab group, and an electrode terminal joined to the conductive member and projecting away from the electrode assembly, and the electrode terminal is a method of manufacturing a power storage device fixed to the case member constituting the casing, among the Bian plane located at both ends in the stacking direction of the electrode assembly, opposite to the one end of the tab is brought together under a bian plane at the other end The support surface can support the electrode assembly in a horizontally placed state in which the tab extends in the horizontal direction, and the electrode terminal can be supported in a state where the axial direction of the electrode terminal extends in the vertical direction. and a base face, made using the manufacturing apparatus of the power storage device and a step for supporting the Bian plane of the other end to the support surface, and a step of supporting the electrode terminals on the base surface, the pedestal And a step of fixing the electrode terminal supported on the surface to the case member.

According to this, during manufacture of the power storage device, when fixing the electrode terminal to the case member, thereby supporting the other end of Bian plane of the electrode assembly to the support surface. In this state, the tab is in a state extending in the horizontal direction, and the electrode terminal can be supported on the pedestal surface in a state where the tab is not folded back. For this reason, the electrode terminal is supported by the pedestal surface in a direction different from the horizontal direction in which the tab extends. Then, when the case member is placed on the electrode terminal supported on the pedestal surface and the electrode terminal is fixed to the case member, a pressing force accompanying fixation is applied toward the case member and the electrode terminal along the axial direction of the electrode terminal. The electrode assembly is retracted from the direction in which the pressing force is applied, and a load due to the pressing force is suppressed from being applied to the electrode assembly.

  Therefore, when manufacturing a power storage device having a tab group in which tabs are gathered and having a conductive member bonded to the tab group, an electrode terminal is obtained by using a power storage device manufacturing apparatus having a support surface and a pedestal surface. It is suppressed that the load when fixing the to the case member is applied to the electrode assembly.

Moreover, about the manufacturing apparatus of an electrical storage apparatus, it is preferable to provide the support stand which has the said support surface and can change the relative height with the said pedestal surface.
According to this, for example, the height of the support surface can be adjusted by adjusting the thickness of the support base. When the height of the support surface is adjusted, the relative height with the pedestal surface is adjusted, and the height in the stacking direction of the electrode assembly supported by the support surface and the relative position with the electrode terminal can be adjusted. . For example, when a tab group in which tabs are welded to each other is welded to an electrode terminal, if the electrode terminal is not supported at an appropriate height with respect to the electrode assembly, it will bend toward one end side of the tab group. Or tension is applied to the electrode terminal from one end side of the tab group, and the electrode terminal may be inclined. At this time, the above-mentioned fear can be avoided by adjusting the height of the support surface.

  In addition, the power storage device manufacturing apparatus includes a pedestal block including the pedestal surface, and the pedestal block includes a terminal positioning portion that surrounds at least a part of the protrusion protruding from the inner surface of the case member including the electrode terminal. It may be.

  According to this, when the case member or the electrode terminal is about to move in the direction along the pedestal surface with the protrusion including the electrode terminal supported by the pedestal surface, the protrusion comes into contact with the terminal positioning portion, and the pedestal Movement of the case member and the electrode terminal in the direction along the surface can be suppressed.

  ADVANTAGE OF THE INVENTION According to this invention, it can suppress that a load is applied to an electrode assembly at the time of fixation to the cover body of an electrode terminal.

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. The perspective view which shows a manufacturing apparatus. The perspective view which shows the state which inserts a shaft in a fitting hole. The perspective view which shows the state which supported the positive electrode terminal and the negative electrode terminal on the base surface. The fragmentary sectional view which shows the state which supported the positive electrode terminal and the negative electrode terminal on the base surface. The top view which shows the state which operated the press apparatus. The figure which shows background art.

Hereinafter, an embodiment in which a manufacturing apparatus and a manufacturing method for a power storage device are embodied in a manufacturing apparatus and a manufacturing method for a secondary battery will be described with reference to FIGS.
As shown in FIGS. 1 and 2, 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 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 as an electrode, a negative electrode 22 as an electrode, and a separator that insulates the positive electrode 21 and the negative electrode 22 from each other. 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 porous resin separator is interposed between the electrodes. Hereinafter, in the electrode assembly 20, the direction in which the positive electrode 21 and the negative electrode 22 are stacked is defined as a stacking direction.

  The positive electrode 21 has a positive current collecting tab 23 on a part of one side 21a (long side), and the negative electrode 22 has a negative current collecting tab 24 on a part of one side 22a (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 has a rectangular Bian plane 20a at both ends in the stacking direction of the positive electrode 21 and the negative electrode 22. The electrode assembly 20 includes a tab-side end surface 20b formed by collecting one side 21a of the positive electrode 21, one side 22a of the negative electrode 22, and one side of the separator in the stacking direction. The electrode assembly 20 includes a positive electrode tab group 25 formed by collecting the positive electrode current collecting tabs 23 on the tab side end face 20b. The positive electrode tab group 25 gathers the positive electrode current collecting tabs 23 of all the positive electrode 21 to one end side in the range from one end to the other end in the stacking direction of the positive electrode tab group 25, and one end side in the collected state. It is formed by folding back toward the other end opposite to the side. Moreover, in the positive electrode tab group 25, each positive electrode current collection tab 23 is welded mutually.

In the electrode assembly 20, a direction along the tab side end surface 20 b and perpendicular to the stacking direction is defined as the width direction of the electrode assembly 20.
The positive electrode conductive member 26 connected to the positive electrode tab group 25 is formed by bending a single metal plate, for example, an aluminum plate, and has a crank shape. The positive electrode conductive member 26 has a positive electrode tab side weld piece 26a on one side in the longitudinal direction with respect to the curved portion, and the positive electrode current collecting tab 23 at one end in the stacking direction is joined to the positive electrode tab side weld piece 26a by welding. Yes. Further, the positive electrode conductive member 26 protrudes outward from the side edge extending in the protruding direction of the positive electrode current collecting tab 23 on the other side in the longitudinal direction with respect to the curved portion, and the positive electrode terminal 30 is formed in the protruding portion. Welded.

  The electrode assembly 20 includes a negative electrode tab group 27 formed by collecting the negative electrode current collecting tabs 24 on the tab side end face 20b. The negative electrode tab group 27 gathers the negative electrode current collecting tabs 24 of all the negative electrode electrodes 22 toward one end within the range from one end to the other end of the negative electrode tab group 27 in the stacking direction, and one end side in the collected state. It is formed by folding back toward the other end opposite to the side. In the negative electrode tab group 27, the negative electrode current collecting tabs 24 are welded to each other.

  The negative electrode conductive member 28 connected to the negative electrode tab group 27 is formed by bending a single metal plate, for example, a copper plate, and has a crank shape. The negative electrode conductive member 28 has a negative electrode tab side weld piece 28a on one side in the longitudinal direction with respect to the curved portion, and the negative electrode current collecting tab 24 at one end in the stacking direction is joined to the negative electrode tab side weld piece 28a by welding. Yes. Further, the negative electrode conductive member 28 protrudes outward from the side edge extending in the protruding direction of the negative electrode current collecting tab 24 on the other side in the longitudinal direction with respect to the curved portion, and the negative electrode terminal 31 is formed on the protruding portion. Welded. Therefore, the positive electrode tab group 25 and the positive electrode conductive member 26 are separated from the negative electrode tab group 27 and the negative electrode conductive member 28 in the width direction of the electrode assembly 20.

  The positive electrode terminal 30 and the negative electrode terminal 31 have a columnar shape as a whole. Each of the positive electrode terminal 30 and the negative electrode terminal 31 includes a cylindrical pole column portion 40 and a columnar column base portion 41. A pole post 40 is erected from the center of the base 41. The positive electrode terminal 30 and the negative electrode terminal 31 have a male screw portion 42 on the outer peripheral surface of the polar column portion 40. In the positive electrode terminal 30 and the negative electrode terminal 31, the direction in which the pole column part 40 stands from the base 41 is the axial direction of the positive electrode terminal 30 and the negative electrode terminal 31.

  As shown in FIG. 1, cylindrical and resin terminal covers 50 are attached to the base portions 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 main body 12 from the positive terminal 30 and the negative terminal 31. . Further, the electrode cover 20 is electrically insulated from the positive terminal 30 and the negative 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. For this reason, the positive electrode terminal 30 and the negative electrode terminal 31 protrude in a direction away from the electrode assembly 20. 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 in contact with the outer surface of the lid 13 of the case 11.

  As shown in FIG. 2, a nut 55 is screwed into the male screw portion 42 of the pole column portion 40 of the positive electrode terminal 30, and the positive electrode terminal 30 is fixed to the lid body 13. Similarly, a nut 56 is screwed into the male screw portion 42 of the pole column portion 40 of the negative electrode terminal 31, and the negative electrode terminal 31 is fixed to the lid body 13. Therefore, in this embodiment, the lid body 13 corresponds to a case member to which the positive electrode terminal 30 and the negative electrode terminal 31 are fixed.

  The flange portion 54 of the insulating member 52 is sandwiched between the outer surface of the lid 13 of the case 11 and the nuts 55 and 56, and the nuts 55 and 56 and the lid 13 are insulated by the flange portion 54. Further, between the nuts 55 and 56 and the base portion 41, 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 narrowed, and the positive electrode terminal 30 and the negative electrode terminal 31 are It is fixed to the lid 13 of the case 11.

  As shown in FIGS. 1 and 2, the positive electrode terminal 30 and the negative electrode terminal 31 have a concave portion 43 that extends in the axial direction of the polar column portion 40. The recess 43 includes a female screw hole in which a screw groove (not shown) is formed, and a large-diameter hole portion 47 in which a screw groove is not formed on the tip side of the female screw hole along the axial direction and is larger in diameter than the female screw hole. It is composed of The recess 43 is open at the center of the tip surface of the pole column 40 and has a predetermined depth in the axial direction of the pole column 40. Further, the positive electrode terminal 30 and the negative electrode terminal 31 have a notch 44 in the pole column portion 40. The notch 44 is opened so as to continuously extend in the radial direction from the outer peripheral surface of the concave portion 43 on the distal end surface of the pole column portion 40, and in the present embodiment, the large-diameter hole portion 47 extends in the axial direction of the pole column portion 40. And almost the same depth. The large-diameter hole 47 and the notch 44 constitute a fitting hole 46. The fitting hole 46 is formed at the tip of the portion protruding from the lid 13 in the pole column portion 40 of the positive electrode terminal 30 and the negative electrode terminal 31.

Next, a secondary battery manufacturing apparatus (jig) 60 for fixing (fastening) the positive electrode terminal 30 and the negative electrode terminal 31 to the lid body 13 will be described.
As shown in FIG. 3, the manufacturing apparatus 60 includes a lower structure 61 and an upper structure 62. The lower structure 61 has a rectangular plate shape and extends in the horizontal direction. The manufacturing apparatus 60 includes a resin-made support base 63 on the upper surface of the lower structure 61. The material of the support base 63 is, for example, PPS, and suppresses the adhesion of metal foreign matter to the electrode assembly 20. The support base 63 has a rectangular plate shape. The support base 63 is attached to the lower structure 61 with one of the two surfaces having the largest area contacting the lower structure 61, and has a support surface 63a extending in the horizontal direction on the other surface. . The supporting surface 63a, Bian plane 20a of the electrode assembly 20 is supported. The support surface 63a can support the electrode assembly 20 in a horizontally placed state in which the positive electrode current collecting tab 23 and the negative electrode current collecting tab 24 extend in the horizontal direction.

  The lower structure 61 includes a prismatic pedestal block 70 extending in the longitudinal direction of the lower structure 61. The pedestal block 70 has a prismatic shape and is provided at one end portion in the short direction on the upper surface of the lower structure 61. At both ends in the longitudinal direction of the pedestal block 70, support columns 71 and 72 for supporting the upper structure 62 are disposed. The column portions 71 and 72 have a substantially U-shaped cross section, are arranged so that the U-shaped opening faces the pedestal block 70 side (inner side), and are fixed to the lower structure 61 so as to extend in the vertical direction. ing.

  The upper structure 62 has a movable block 73 positioned above the pedestal block 70 and shafts 78 and 79 extending downward from the movable block 73. The movable block 73 includes sliding members 74 and 75 at both ends in the longitudinal direction, and the sliding members 74 and 75 support the movable block 73 so as to be slidable in the vertical direction. The sliding members 74 and 75 have a substantially rectangular cross section and include sliding portions 74a and 75a extending in the vertical direction. These sliding portions 74a and 75a are disposed inside the U-shaped openings of the support columns 71 and 72, and the sliding portions 74a and 75a are supported so as to be slidable in the vertical direction with respect to the support columns 71 and 72. Yes.

  The movable block 73 includes a shaft 78 that is inserted into the fitting hole 46 of the positive electrode terminal 30 and a shaft 79 that is inserted into the fitting hole 46 of the negative electrode terminal 31. The pair of shafts 78 and 79 are disposed at positions separated from each other in the longitudinal direction of the movable block 73, and each shaft 78 and 79 extends from the movable block 73 toward the pedestal block 70.

  As shown in FIGS. 3 and 4, the shafts 78 and 79 have the same configuration. The shafts 78 and 79 have a rod portion 80 and a head 81 provided at one end of the rod portion 80 in the axial direction. The rod part 80 has a cylindrical part 82 and a blade part 83 so as to be fitted into the fitting hole 46 of the terminal, and the blade part 83 has a shape protruding in the radial direction from the outer peripheral surface of the cylindrical part 82. The head 81 has a prismatic shape as a whole.

  As shown in FIG. 3, one shaft 79 is fixed to the movable block 73 so as not to move. On the other hand, the other shaft 78 is supported with a backlash with respect to the movable block 73. A U-shaped block 90 is screwed to an arrangement position of the shaft 78 on the upper surface of the movable block 73. The manufacturing apparatus 60 includes a pressing device 91 in the upper structure 62, and the shaft 78 is pressed to the outside in the longitudinal direction of the upper structure 62 by the pressing device 91 and is locked so as not to move.

Next, the pedestal block 70 of the manufacturing apparatus 60 will be described in detail.
The pedestal block 70 includes an accommodation recess 70 a that is recessed from both side portions in the longitudinal direction, and the length along the longitudinal direction of the accommodation recess 70 a extends from the outer edge of the positive electrode terminal 30 along the width direction of the electrode assembly 20. It is longer than the length to the outer edge of the terminal 31. Therefore, the accommodating recess 70 a can accommodate the positive terminal 30 and the negative terminal 31 integrated with the electrode assembly 20.

  The pedestal block 70 has a pedestal surface 76 at a position recessed by one step from the facing surface 70d to the movable block 73, and the pedestal surface 76 is provided on the inner bottom surface of the accommodating recess 70a. The pedestal surface 76 is flat and extends in the longitudinal direction of the pedestal block 70. The pedestal surface 76 has circular terminal support surfaces 76a at both ends in the longitudinal direction, and has a rectangular tab support surface 76b connected to both terminal support surfaces 76a.

  The diameter of the terminal support surface 76 a is slightly longer than the outer diameter of the terminal cover 50 attached to the positive terminal 30 and the negative terminal 31. For this reason, the bottom surface of the positive electrode terminal 30 or the negative electrode terminal 31 can be supported on the terminal support surface 76a with the terminal cover 50 attached. The pedestal surface 76 can support the positive electrode terminal 30 and the negative electrode terminal 31 with their axial directions extending in the vertical direction. The pedestal surface 76 is located at a position higher than the support surface 63a of the support base 63, and the pedestal surface 76 and the support surface 63a are parallel to each other.

  The pedestal block 70 includes a positioning portion 77, and the positioning portion 77 surrounds the pedestal surface 76 except for one side edge of the pedestal surface 76 near the support base 63. The positioning portion 77 includes a terminal positioning portion 77a that surrounds the terminal support surface 76a, and a tab side positioning portion 77b that extends along the longitudinal direction of the tab support surface 76b. The terminal positioning part 77a and the tab side positioning part 77b are connected. And if the positive electrode terminal 30 and the negative electrode terminal 31 are supported by the terminal support surface 76a, the terminal positioning part 77a will surround a part of the terminal cover 50 attached to the positive electrode terminal 30 and the negative electrode terminal 31 in the circumferential direction. Since the positive electrode terminal 30 or the negative electrode terminal 31 is accommodated inside the terminal cover 50, the terminal positioning portion 77 a surrounds a part of the positive electrode terminal 30 or the negative electrode terminal 31 in the circumferential direction. Therefore, in the present embodiment, the positive electrode terminal 30 and the negative electrode terminal 31 to which the terminal cover 50 is attached constitute a protrusion that protrudes from the inner surface of the lid body 13.

  The pedestal block 70 includes a tab recess 69 on a standing surface 70 c facing the support base 63 among the plurality of side surfaces. The tab recess 69 is recessed from the standing surface 70c toward the tab support surface 76b.

Next, the operation of the manufacturing apparatus 60 and the manufacturing method of the secondary battery 10 will be described together with the assembly process of the positive electrode terminal 30 and the negative electrode terminal 31.
First, the positive electrode terminal 30 is welded to the positive electrode conductive member 26, and the negative electrode terminal 31 is welded to the negative electrode conductive member 28. Further, the positive electrode current collecting tab 23 and the negative electrode current collecting tab 24 are gathered together on one end side in the stacking direction of the electrode assembly 20. Next, the positive electrode tab side welding piece 26a is welded to the positive electrode current collecting tab 23 on one end side in the stacking direction of the positive electrode tab group 25, and the negative electrode tab side welding is performed on the negative electrode current collecting tab 24 on one end side in the stacking direction of the negative electrode tab group 27. The pieces 28a are welded.

Next, as shown in FIGS. 4 and 5, the support surface 63a of the support base 63 in the manufacturing apparatus 60, placing the Bian plane 20a in the stacking direction other end side of the electrode assembly 20, Bian plane 20a to the supporting surface 63a The process of supporting is performed. In this state, in the positive electrode tab group 25 and the negative electrode tab group 27, the positive electrode current collecting tab 23 and the negative electrode current collecting tab 24 are gathered near one end in the stacking direction of the electrode assembly 20 and are still protruding. , Not wrapped. When the electrode assembly 20 is supported on the support surface 63a, the electrode assembly 20 is supported on the support surface 63a with the positive electrode current collecting tab 23 and the negative electrode current collecting tab 24 extending in the horizontal direction.

  The positive electrode tab group 25 and the negative electrode tab group 27 are supported on the tab support surface 76b in a state where the positive electrode current collection tab 23 and the negative electrode current collection tab 24 are gathered near one end in the stacking direction of the electrode assembly 20. . At this time, the positive electrode tab group 25 and the negative electrode tab group 27, and the positive electrode terminal 30 and the negative electrode terminal 31 are accommodated inside the accommodating recess 70a. Further, one side edge of the positive electrode conductive member 26 and the negative electrode conductive member 28 is brought into contact with the tab side positioning portion 77b.

  At the same time, the base portions 41 of the positive electrode terminal 30 and the negative electrode terminal 31 are supported on the terminal support surface 76a while the positive electrode current collecting tab 23 and the negative electrode current collecting tab 24 are gathered close to one end in the stacking direction of the electrode assembly 20. The process to make is performed. As a result, the positive electrode terminal 30 and the negative electrode terminal 31 are supported by the pedestal surface 76, and the axial direction of the positive electrode terminal 30 and the negative electrode terminal 31 extends in the vertical direction. Then, the positive electrode terminal 30 and the negative electrode terminal 31 are supported from a direction orthogonal to the horizontal direction, the axial direction being different from the protruding direction of the positive electrode current collecting tab 23 and the negative electrode current collecting tab 24 from the tab side end surface 20b. .

In a state where Bian plane 20a is supported in the electrode assembly 20 to the support surface 63a, the base surface 76 is in a position slightly lower than the Bian plane 20a in the stacking direction end side. And the terminal support surface 76a exists in the same surface as the bottom face of the base 41 of the positive electrode terminal 30 and the negative electrode terminal 31, or a position with a slight height difference.

  Next, as shown in FIGS. 4 and 5, the insulating member 52 is attached to the through hole 14 of the lid 13. Further, the terminal cover 50 and the O-ring 51 are attached to the positive terminal 30 and the negative terminal 31. At this time, as shown in FIG. 6, the terminal cover 50 enters the inside of the terminal positioning portion 77a and is supported by the terminal support surface 76a.

  Then, the pole column portions 40 of the positive electrode terminal 30 and the negative electrode terminal 31 are inserted into the through holes 14 of the lid body 13, and the lid body 13 is supported on the O-ring 51. Next, nuts 55 and 56 are arranged on the male screw portions 42 of the positive electrode terminal 30 and the negative electrode terminal 31. Next, the movable block 73 is moved up and down, and the rod portions 80 of the shafts 78 and 79 are inserted into the fitting holes 46 of the positive electrode terminal 30 and the negative electrode terminal 31.

  Subsequently, as shown in FIG. 7, the pressing device 91 is operated to position the shaft 78. Then, in a state where the positive electrode terminal 30 and the negative electrode terminal 31 are positioned, the nuts 55 and 56 are screwed into the male screw portion 42, and the positive electrode terminal 30 and the negative electrode terminal 31 are fastened and fixed to the lid body 13. At this time, when the blade portions 83 of the shafts 78 and 79 are fitted into the notches 44 of the positive electrode terminal 30 and the negative electrode terminal 31 and the nuts 55 and 56 are screwed together, the positive electrode terminal 30 and the negative electrode terminal 31 rotate together. Is suppressed. Then, the lid body 13 and the electrode assembly 20 are integrated.

  Thereafter, the positive electrode tab group 25 and the negative electrode tab group 27 are folded back to the other end side in the stacking direction, and at the same time, the lid body 13 is made to face the tab side end surface 20b of the electrode assembly 20, and the electrode assembly 20 is used as it is. 12 to accommodate. Then, the lid 13 is joined to the case body 12 to form the case 11, and the electrolytic solution is injected into the case 11 to manufacture the secondary battery 10.

According to the above embodiment, the following effects can be obtained.
(1) is supported Bian plane 20a of the electrode assembly 20 to the support surface 63a, positive electrode current collector tab 23 and the negative electrode current collector tab 24 can be horizontally the electrode assembly 20 so as to extend in the horizontal direction support . Further, when the positive electrode terminal 30 and the negative electrode terminal 31 are supported on the pedestal surface 76, the positive electrode terminal 30 and the negative electrode terminal 31 can be supported so that the axial direction extends in the vertical direction. For this reason, the positive electrode terminal 30 and the negative electrode terminal 31 can be supported by the manufacturing apparatus 60 from the direction orthogonal to the protruding direction of the positive electrode current collecting tab 23 and the negative electrode current collecting tab 24 from the electrode assembly 20. Therefore, the positive electrode terminal 30 and the negative electrode terminal 31 are supported by the pedestal surface 76 so that the axial direction thereof is along the surface of the tab side end surface 20b. For this reason, the electrode assembly 20 can be supported at a position retracted from the screwing direction of the nuts 55 and 56 (the axial direction of the positive electrode terminal 30 and the negative electrode terminal 31). Therefore, when the positive electrode terminal 30 and the negative electrode terminal 31 are fastened and fixed to the lid body 13, it is possible to suppress the load associated with the screwing of the nuts 55 and 56 from being applied to the electrode assembly 20. As a result, it is possible to prevent the positive electrode 21 and the negative electrode 22 from being displaced or short-circuited by the pressure accompanying the screwing of the nuts 55 and 56.

  (2) The pedestal block 70 includes a tab recess 69. For this reason, when the positive electrode tab group 25 and the negative electrode tab group 27 are supported by the pedestal surface 76, the portions of the positive electrode tab group 25 and the negative electrode tab group 27 that are not supported by the pedestal surface 76 escape to the tab recess 69. be able to. Therefore, the positive electrode tab group 25 and the negative electrode tab group 27 can be supported by the pedestal surface 76 without being bent by the pedestal block 70.

  (3) The manufacturing apparatus 60 includes a support base 63 that supports the electrode assembly 20. By adjusting the thickness of the support base 63, the relative height between the support surface 63 a and the pedestal surface 76 is adjusted, and the height of the electrode assembly 20 supported by the support surface 63 a in the stacking direction, The relative position between the positive terminal 30 and the negative terminal 31 can be adjusted. For this reason, while being able to support the positive electrode terminal 30 and the negative electrode terminal 31 with appropriate height with respect to the electrode assembly 20, it can suppress that bending arises in the one end side of the positive electrode tab group 25 and the negative electrode tab group 27. The positive electrode terminal 30 and the negative electrode terminal 31 can be supported on the pedestal surface 76 without any inclination.

  (4) The pedestal block 70 includes a terminal positioning portion 77a surrounding the terminal support surface 76a. For this reason, in a state where the positive electrode terminal 30 and the negative electrode terminal 31 are supported by the terminal support surface 76a, the terminal cover 50 attached to the positive electrode terminal 30 and the negative electrode terminal 31 is surrounded by the terminal positioning portion 77a. For this reason, it can suppress that the positive electrode terminal 30 and the negative electrode terminal 31 move to the direction in alignment with the terminal support surface 76a by the terminal positioning part 77a. Therefore, the positions of the fitting holes 46 of the positive electrode terminal 30 and the negative electrode terminal 31 are suppressed from moving from the positions of the shafts 78 and 79, and the shafts 78 and 79 can be easily inserted into the fitting holes 46.

  (5) The pedestal block 70 includes a tab side positioning portion 77b. Therefore, when the positive electrode tab group 25 and the negative electrode tab group 27 are supported on the pedestal surface 76, if the side edges of the positive electrode conductive member 26 and the negative electrode conductive member 28 are brought into contact with the tab side positioning portion 77b, the positive electrode conductive member 26 And the movement of the negative electrode conductive member 28 is restricted.

In addition, you may change the said embodiment as follows.
In the base surface 76, the positioning part 77 may not be present.
The tab side positioning part 77b may not be provided in the positioning part 77, and only the terminal positioning part 77a may be provided.

The size of the terminal support surface 76a may be a size that can support only the positive electrode terminal 30 or the negative electrode terminal 31.
The support base 63 may not be provided, and in this case, the electrode assembly 20 is directly supported by a support surface including the upper surface of the lower structure 61.

The pedestal surface 76 may not be parallel to the support surface 63a of the support base 63, and the pedestal surface 76 may be slightly inclined with respect to the support surface 63a.
○ Although the terminal support surface 76a is circular and the terminal positioning portion 77a is also circular in plan view, the shapes of the terminal support surface 76a and the terminal positioning portion 77a are matched to the shape of the protrusion protruding from the back surface of the lid 13. It may be changed. For example, if the base portion 41 of the negative electrode terminal 31 has a quadrangular prism shape and the terminal cover 50 covering the base portion 41 has a quadrangular cylindrical shape, the terminal support surface 76a and the terminal positioning portion 77a may have a rectangular shape in plan view.

The terminal positioning portion 77a may be provided only on one side of the pedestal surface 76 in the longitudinal direction.
In the embodiment, the fitting hole 46 (notch 44) of the positive electrode terminal 30 and the negative electrode terminal 31 and the blade portion 83 of the shafts 78 and 79 prevent the positive electrode terminal 30 and the negative electrode terminal 31 from rotating together. However, the structure for suppressing co-rotation is not limited to the structure described above. For example, the tips of the shafts 78 and 79 may be hexagonal, and hexagonal fitting holes may be formed in the positive electrode terminal 30 and the negative electrode terminal 31.

O You may actualize as a nickel-hydrogen secondary battery as an electrical storage apparatus, or an electric double layer capacitor.
Next, a technical idea that can be grasped from the above embodiment and another example will be additionally described.

  (A) The power storage device in which the electrode terminal is fixed to the lid body by screwing a nut into a male screw portion provided on a pole column portion of the electrode terminal.

10 ... secondary battery as a power storage device, 11 ... case, 13 ... lid as a case member, 20 ... electrode assembly, 20a ... Bian plane, 20b ... tab side end face, 21a ... side, cathode as 21 ... electrode Electrode, 22 ... Negative electrode as an electrode, 22a ... One side, 23 ... Positive current collector tab, 24 ... Negative current collector tab, 25 ... Positive electrode tab group, 26 ... Positive electrode conductive member, 27 ... Negative electrode tab group, 28 ... Negative electrode conductivity 30 ... Positive electrode terminal as electrode terminal, 31 ... Negative electrode terminal as electrode terminal, 50 ... Terminal cover constituting projection, 60 ... Manufacturing apparatus, 63 ... Support base, 63a ... Support surface, 70 ... Base block, 76: Base surface, 77a: Terminal positioning portion.

Claims (4)

A power storage device manufacturing apparatus for positioning an electrode terminal connected to an electrode assembly via a tab, and fixing the positioned electrode terminal to a case member,
A support surface capable of supporting the electrode assembly in a horizontal state in which the tab extends in a horizontal direction;
A pedestal surface capable of supporting the electrode terminal in a state in which the axial direction of the electrode terminal extends in the vertical direction ;
Apparatus for manufacturing a power storage device which is characterized that you fix the electrode terminals supported on the base face to the case member.   The power storage device manufacturing apparatus according to claim 1, further comprising a support base that has the support surface and is capable of changing a height relative to the pedestal surface.   3. The power storage device according to claim 2, further comprising: a pedestal block including the pedestal surface, the terminal block including a terminal positioning portion that surrounds at least a part of the protrusion that protrudes from the inner surface of the case member including the electrode terminal. manufacturing device. An electrode assembly in which electrodes of different poles are alternately stacked in a state where the electrodes are insulated from each other;
A case for housing the electrode assembly;
A tab side end surface of the electrode assembly formed by collecting one side of the electrode in the stacking direction;
The tabs protruding from the tab side end face are gathered closer to one end in the laminating direction, and a tab group folded to the other end side in the laminating direction,
A conductive member joined to a tab at one end of the tab group in the stacking direction;
An electrode terminal bonded to the conductive member and projecting in a direction away from the electrode assembly,
A method of manufacturing a power storage device in which the electrode terminal is fixed to a case member constituting the case,
Of Bian plane located at both ends in the stacking direction of the electrode assembly, wherein the tab is asked gathered one end side is capable of supporting the other end of Bian plane opposite from below, and the tub is horizontal A support surface capable of supporting the electrode assembly in a laterally extending state.
The electrode terminal is performed using a power storage device manufacturing apparatus having a pedestal surface capable of supporting the electrode terminal in a state in which the axial direction of the electrode terminal extends in the vertical direction,
A step of supporting the Bian plane of the other end to the support surface,
Supporting the electrode terminal on the pedestal surface;
Fixing the electrode terminal supported by the pedestal surface to the case member.