JP6582579B2 - Welding apparatus and welding method - Google Patents

Description

  The present invention relates to a welding apparatus and a welding method for welding a tab of an electrode assembly and a conductive member.

  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. In general, a secondary battery includes a case that accommodates an electrode assembly, and the electrode assembly is accommodated in the case. And extraction of the electric power from a secondary battery is performed through the electrode terminal connected via the electroconductive member to the positive electrode and negative electrode of an electrode assembly.

  The electrode assembly includes, for example, a stacked electrode assembly in which separators are interposed between a plurality of positive electrodes and a plurality of negative electrodes, or between a belt-like positive electrode and a belt-like negative electrode. There is a wound-type electrode assembly wound with a strip-shaped separator interposed therebetween.

  For example, in the secondary battery of Patent Document 1, an electrode assembly housed in a case has a positive electrode and a negative electrode, the positive electrode has a positive electrode tab, and the negative electrode has a negative electrode tab. In each pole, the plurality of tabs are joined to the conductive member by resistance welding in a state of being gathered together at one end side in the stacking direction, and each tab of each pole is electrically connected to the conductive member. .

JP 2014-182880 A

  Incidentally, as in the secondary battery disclosed in Patent Document 1, in order to join each tab and each conductive member by resistance welding in each electrode, first, the tabs are gathered together in the stacking direction. After the conductive members are stacked on the formed tabs, it is necessary to sandwich the tabs and the conductive members with welding electrodes, which is very laborious.

  The present invention has been made paying attention to such problems existing in the prior art, and the purpose thereof is a welding apparatus capable of easily performing a welding operation between a tab laminate and a conductive member, and It is to provide a welding method.

  A welding apparatus for solving the above problems includes an electrode assembly in which electrodes having tabs protruding from one side are stacked in a state where electrodes having different polarities are insulated from each other, and the electrode assembly is accommodated A power storage device comprising: a case to be fixed; an electrode terminal that is fixed to a wall of the case; and that transmits and receives electricity to and from the electrode assembly; and a conductive member that electrically connects the tab and the electrode terminal. Therefore, a welding apparatus for welding the tab laminated body in a state where the tabs are stacked and the conductive member, wherein the tab located at one end in the laminating direction in the tab laminated body is a first tab, the laminating direction When the tab located at the other end of the second tab is a second tab, a pressing component that presses the conductive member against the second tab along the stacking direction, and the pressing of the conductive member by the pressing component, A foil collecting part for gathering the laminated body from the second tab toward the first tab in the laminating direction, a welding part for welding the tab laminated body and the conductive member, the pressing part, and the collecting part A gist is provided with a foil component and an actuator that moves the welded component along the stacking direction.

  According to this, the tab laminate is gathered by the foil collecting component, the conductive member is pressed to the tab laminate by the pressing component, and the welding of the tab laminate and the conductive member by the welding component is performed by the actuator. This can be done by moving each part. Therefore, it is possible to collectively collect the tab laminates, press the conductive members against the tab laminates, and weld the tab laminates and the conductive members together with a welding apparatus, and separate apparatuses for each process. As compared with the case where the welding is performed, the welding work can be easily performed, and the welding time can be shortened.

  In the welding apparatus, the actuator includes a rod that can be advanced and retracted in the laminating direction, and a spring that can be expanded and contracted along the advancing and retracting direction of the rod is attached to the rod, and the foil collecting component is supported by the spring. In addition, another spring that can be expanded and contracted along the advancing and retracting direction of the rod may be attached to the rod of the actuator, and the pressing component may be supported by the other spring.

  According to this, even after the foil collecting component presses the tab laminate, the foil collecting component comes into contact with the electrode assembly and stops moving, and even if the rod protrudes toward the tab laminated body, the spring contracts. The foil collecting component can be retracted from the electrode assembly relative to the rod to prevent the electrode assembly from being crushed.

  In addition, after the pressing component presses the conductive member against the tab stack and the movement of the pressing component stops, even if the rod protrudes toward the tab stack, the pressing component is moved against the rod by the contraction of another spring. The tab assembly can be prevented from being crushed by moving backward from the electrode assembly.

  In the welding apparatus, the welding component may be a pair of welding electrodes for performing resistance welding, and the welding electrodes may be movable in the stacking direction by the actuator.

According to this, the welding electrode can be separated from the tab laminate by the actuator. For this reason, when a conductive member is stacked on the tab laminate, the welding electrode does not get in the way.
In addition, regarding the welding apparatus, during the resistance welding, a protective plate is interposed between one of the welding electrodes in the stacking direction and the tab stacked body, and the welding apparatus includes the one of the welding electrodes in the stacking direction. There may be provided a protective plate placing portion arranged between the welding electrode and the tab laminate and placing the protective plate.

  According to this, by setting the protective plate on the protective plate mounting portion, it is possible to maintain the protective plate and the tab laminate in a stacked state. For this reason, it is not necessary to manually perform the operation of interposing the protective plate between the welding electrode and the tab laminate, and the resistance welding operation is facilitated.

  Further, for the welding apparatus, the wall portion, the pair of conductive members having different polarities, and the pair of electrode terminals having different polarities constitute a lid terminal assembly integrated in advance, and the conductive members are The cover terminal assembly includes a connection piece projecting from the wall portion, and the welding apparatus includes the pressing part, the foil collecting part, and the welding part, and the connection piece and the tab stack. Weld the body in two places.

According to this, the tab laminated body of the same polarity can be simultaneously welded to the pair of conductive members of the lid terminal assembly.
A welding method for solving the above-described problems includes an electrode assembly in which electrodes having tabs protruding from one side are stacked with electrodes having different polarities insulated from each other, and the electrode assembly is accommodated. A power storage device comprising: a case to be fixed; an electrode terminal that is fixed to a wall of the case; and that transmits and receives electricity to and from the electrode assembly; and a conductive member that electrically connects the tab and the electrode terminal. Therefore, a welding method for welding a tab laminated body in a state where the tabs are stacked and the conductive member with a welding device, wherein the welding apparatus brings a plurality of tabs of the tab laminated body together in a laminating direction. A foil collecting part to be collected; a pressing part for pressing the conductive member against the tab laminated body along the laminating direction; and a welded part for welding the tab laminated body and the conductive member. To the body When the tab located at one end in the laminating direction is the first tab and the tab located at the other end in the laminating direction is the second tab, the tab laminated body is moved from the first tab side to the second tab by the foil collecting component. After gathering to the tab side and starting the gathering of the tab laminated body by the foil collecting part, the conductive member is pressed against the first tab of the tab laminated body by the pressing part, and the tab laminated body by the welding part And the conductive member are welded together.

  According to this, the tab laminated body gathered by the foil collecting parts, the pressing of the conductive member to the tab laminated body by the pressing parts, and the welding of the tab laminated body and the conductive member are collectively performed by the welding apparatus. be able to. Therefore, compared to the case where the tab stack is gathered, the conductive member is pressed against the tab stack, and the welding of the tab stack and the conductive member is performed manually one step at a time, the welding operation is simplified. This can be done, and the welding time can be shortened.

  According to the present invention, the welding operation of the tab laminate and the conductive member can be easily performed.

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 disassembled perspective view which shows the component of an electrode assembly. The fragmentary sectional view which shows joining to a tab group, an electrically-conductive member, an auxiliary terminal, and an external terminal. The fragmentary sectional view which shows the joining state of a tab group and an electrically-conductive member. (A) is a perspective view which shows the state which integrated the auxiliary terminal and the external terminal in the cover member, (b) is a perspective view which shows the state which integrated the electrically-conductive member in the cover member. The perspective view which shows a welding apparatus typically. The side view which shows a welding apparatus typically. The side view which shows typically the state which set the electrode assembly to the welding apparatus. The side view which shows typically the state which brought together the some tab. The side view which shows typically the state which presses a connection piece to a some tab and carries out resistance welding.

Hereinafter, an embodiment embodying a welding apparatus will be described with reference to FIGS.
First, the secondary battery 10 as a power storage device will be described.
As shown in FIG. 1 or 2, the secondary battery 10 as a power storage device includes a case 11, and the case 11 accommodates an electrode assembly 12 and a positive and negative electrode tab group 36. The case 11 includes a square box-shaped case member 14 and a lid member 15 as a rectangular flat plate-like wall portion that closes the opening 14 a of the case member 14. In addition, the secondary battery 10 of this embodiment is a lithium ion battery. A positive electrode terminal 16 and a negative electrode terminal 17 are electrically connected to the electrode assembly 12 as electrode terminals for transferring electricity to and from the electrode assembly 12.

  As shown in FIG. 3, the electrode assembly 12 includes a plurality of sheet-like positive electrodes 21 and a plurality of sheet-like negative electrodes 31, and the positive electrodes 21 and the negative electrodes 31 are electrodes having different polarities. The positive electrode 21 has a positive metal foil (aluminum foil in this embodiment) 22 and a positive electrode active material layer 23 formed by applying a positive electrode active material on both surfaces thereof. The negative electrode 31 includes a negative electrode metal foil (copper foil in the present embodiment) 32 and a negative electrode active material layer 33 configured by applying a negative electrode active material on both surfaces thereof. The electrode assembly 12 is a layered type in which a separator 24 is interposed between a plurality of positive electrodes 21 and a plurality of negative electrodes 31 to interpose them.

  The positive electrode 21 has a positive electrode uncoated portion 22 b that is not coated with a positive electrode active material along one side 22 a of the positive metal foil 22. The positive electrode 21 has a tab 25 having a shape protruding from a part of one side 22a. The negative electrode 31 has a negative electrode uncoated portion 33 b that is not coated with a negative electrode active material along one side 32 a of the negative electrode metal foil 32. The negative electrode 31 has a tab 35 having a shape protruding from a part of one side 32a.

  As shown in FIG. 1, the plurality of positive electrode tabs 25 and the plurality of negative electrode tabs 35 are such that the positive electrode tab 25 and the negative electrode tab 35 do not overlap in a state where the positive electrode 21 and the negative electrode 31 are stacked. It is provided at each position. The electrode assembly 12 has a tab-side end face 12b formed by gathering together one side 22a of the positive electrode 21, one side 32a of the negative electrode 31, and one side of the separator 24. The positive electrodes 21 constituting the electrode assembly 12 are stacked such that the tabs 25 are arranged in a row along the stacking direction L. Similarly, the negative electrodes 31 constituting the electrode assembly 12 are stacked such that the tabs 35 are arranged in a row along the stacking direction L.

  The secondary battery 10 has a positive electrode tab group 36 protruding from the tab-side end face 12b. The tab group 36 gathers all the positive electrode tabs 25 toward one end side in the stacking direction L of the electrode assembly 12, It is configured by stacking. Further, the secondary battery 10 has a negative electrode tab group 36 protruding from the tab side end face 12 b, and the tab group 36 brings all the negative electrode tabs 35 close to one end side in the stacking direction L of the electrode assembly 12. Collected and stacked. In the secondary battery 10, the inner surface of the lid member 15 faces each tab group 36 accommodated in the case 11 and the tab side end surface 12 b of the electrode assembly 12. In the electrode assembly 12, a direction along the tab-side end surface 12 b and in which the positive electrode tab 25 (tab group 36) and the negative electrode tab 35 (tab group 36) are arranged is referred to as a parallel direction X. A direction connecting the inner surface of the lid member 15 and the tab side end surface 12b of the electrode assembly 12 with the shortest distance is defined as a facing direction Z.

  A positive electrode conductive member 51 for electrically connecting the electrode assembly 12 and the positive electrode terminal 16 is joined to the positive electrode tab group 36. Further, a negative electrode conductive member 51 for electrically connecting the electrode assembly 12 and the negative electrode terminal 17 is joined to the negative electrode tab group 36.

  Next, the joint structure of the positive electrode tab group 36 and the conductive member 51 and the negative electrode tab group 36 and the conductive member 51 will be described in detail with reference to FIG. In FIG. 5, the bonding structure of the negative electrode tab group 36 and the conductive member 51 is illustrated, but this bonding structure is the same as the bonding structure of the positive electrode tab group 36 and the conductive member 51. The joint structure between the tab group 36 and the conductive member 51 is omitted. In the following description, if the negative electrode is read as the positive electrode, the bonding structure of the positive electrode tab group 36 and the positive electrode conductive member 51 is described.

  As shown in FIG. 5, in the negative electrode tab group 36, the tab 35 positioned at one end in the stacking direction L of the electrode assembly 12 is referred to as a first tab 351. In the negative electrode tab group 36, the tab 35 positioned at the other end in the stacking direction L of the electrode assembly 12 is referred to as a second tab 352. In this case, in the negative electrode tab group 36, the tabs 35 are gathered on one end side in the stacking direction so that the second tab 352 approaches the first tab 351. Thereby, the tabs 35 that are independent and stacked in the stacking stage are gathered on the first tab 351 side. The negative electrode tab group 36 and the conductive member 51 perform resistance welding in a state where the conductive member 51 is in contact with the second tab 352 and the protective plate 40 is in contact with the first tab 351. In addition to being joined, they are electrically connected (conducted).

  The protection plate 40 is a member for protecting the plurality of tabs 35 (particularly the first tab 351) from the welding electrodes when the plurality of tabs 35 and the conductive member 51 are joined by resistance welding. The protection plate 40 has a rectangular plate shape and is joined to the first tab 351.

  In the present embodiment, the tabs 35 are formed in the same size. Therefore, in the stacking direction L of the electrode assembly 12, the tab 35 that is gathered as the negative electrode tab group 36 is shorter as the tab 35 has a longer separation distance from the first tab 351. For this reason, the conduction | electrical_connection part W for making all the tabs 35 conduct | electrically_connect is provided according to the superposition | polymerization area | region with the other tab 35 in the 2nd tab 352. FIG. The conductive member 51 has a fixed piece 52 interposed between the tab group 36 and the lid member 15 in the facing direction Z, a shape that intersects the fixed piece 52 and projects toward the electrode assembly 12, and It has the tab group 36 and the connection piece 53 joined.

Here, the conductive member 51 before being connected to the negative electrode tab group 36 will be described.
As shown in FIG. 4 or FIG. 6B, the fixing piece 52 included in the conductive member 51 has a rectangular plate shape whose long side extends along the parallel direction X. The conductive member 51 is fixed to the inner surface of the lid member 15 via an inner insulating cover 55 described later, and is assembled to the lid member 15. The conductive member 51 has an insertion hole 52a at one end along the direction in which the long side of the fixed piece 52 extends, and an auxiliary terminal 61 described later can be inserted into the insertion hole 52a. In addition, the conductive member 51 has a connection piece 53 at the other end in the direction in which the long side of the fixed piece 52 extends, and the connection piece 53 extends away from the fixed piece 52 from one long side edge of the fixed piece 52. It is a shape protruding in a rectangular shape. The length along the short side of the fixed piece 52 is shorter than the length along the short side of the lid member 15. In the fixed piece 52, a surface facing the inner surface of the lid member 15 via the inner insulating cover 55 is a first surface 52 b, which is parallel to the first surface 52 b and faces the tab side end surface 12 b of the electrode assembly 12. Let the surface be the second surface 52c.

  The connection piece 53 has a rectangular plate shape. In the connection piece 53, of the two rectangular surfaces having the largest area, one surface continuous to the first surface 52b of the fixed piece 52 is defined as an outer surface 53c, and the other surface continuous to the second surface 52c of the fixed piece 52 is provided. The surface is an inner surface 53d. In the connection piece 53, a direction along the outer surface 53 c and the inner surface 53 d and perpendicular to the protruding direction from the fixed piece 52 is defined as the width direction. In the connection piece 53, the length in the width direction is slightly longer than or the same as the maximum length of the tab group 36 along the juxtaposed direction X.

  As shown in FIG. 5, the connection piece 53 includes a bent portion 58 on the distal end side (site near the electrode assembly 12) in the direction away from the fixed piece 52, and the bent portion 58 connects the tab group 36 to the electrode assembly. Covered from the 12th side. When the lid member 15 is viewed from the outer surface, the bent portion 58 overlaps the lid member 15 and the fixed piece 52 and is in a state parallel to the lid member 15. The conductive member 51 is U-shaped when viewed along the side-by-side direction X, and the distal end side of the tab group 36 enters inside the U-shape.

  As shown in FIG. 6B, the bent portion 58 is formed by bending a portion on the distal end side of the connection piece 53. Before forming the bent portion 58, a groove 53a that is recessed from the inner surface 53d toward the outer surface 53c exists at the bent portion of the bent portion 58. The groove 53a exists in the entire width direction of the connection piece 53 and is linear along the width direction. Then, by bending the connection piece 53 from the groove 53a, a plate-like bent portion 58 can be formed on the distal end side in the direction in which the long side of the connection piece 53 extends.

Next, the inner insulating cover 55 provided in the secondary battery 10 will be described.
As shown in FIG. 1, the secondary battery 10 includes an inner insulating cover 55 in the case 11, and the inner insulating cover 55 is interposed between the negative electrode conductive member 51 and the positive electrode conductive member 51 and the lid member 15. Intervene. The inner insulating cover 55 has through holes 56 at both ends in the direction in which the long sides extend.

  The secondary battery 10 includes a positive terminal 16 and a negative terminal 17 that are fixed to the lid member 15. Each of the positive electrode terminal 16 and the negative electrode terminal 17 includes an auxiliary terminal 61 fixed to the lid member 15 via the above-described inner insulating cover 55 and an outer insulating member 57 described later. The positive auxiliary terminal 61 is made of aluminum, and the negative auxiliary terminal 61 is made of copper. The auxiliary terminal 61 includes a prismatic pedestal portion 61a, a first caulking portion 61b that protrudes from one surface of the pedestal portion 61a, and a second caulking portion 61c that protrudes from the other surface of the pedestal portion 61a. .

  In the secondary battery 10, the auxiliary terminal 61 is insulated from the lid member 15 by the outer insulating member 57. The outer insulating member 57 has a cylindrical shape, and has a pedestal support portion 57a on one end side in the axial direction. The pedestal support portion 57a has an auxiliary terminal recess 57b having a shape into which the pedestal portion 61a is fitted. The outer insulating member 57 has a cylindrical shaft portion 57c having a smaller diameter than the pedestal support portion 57a and inserted into the terminal insertion hole 15b of the lid member 15.

  Next, the structure of the positive terminal 16 and the negative terminal 17 will be described. FIG. 4 illustrates the structure of the negative electrode terminal 17, but the structure of the positive electrode terminal 16 is the same as that of the negative electrode terminal 17. In the description of the negative electrode terminal 17, the positive electrode terminal 16 can be described by replacing the negative electrode with the positive electrode.

  As shown in FIG. 4, in the outer insulating member 57, the pedestal support portion 57 a is disposed on the outer surface of the lid member 15, and the shaft portion 57 c is fitted into the terminal insertion hole 15 b of the lid member 15. The shaft portion 57 c is inserted through the through hole 56 of the inner insulating cover 55.

  In a state where the pedestal portion 61a of the auxiliary terminal 61 is fitted in the auxiliary terminal recess 57b, the first caulking portion 61b is electrically conductive in a state of passing through the shaft portion 57c of the outer insulating member 57 and the insertion hole 52a of the conductive member 51. The auxiliary terminal 61 is fixed to the lid member 15 by being caulked by the member 51. The auxiliary terminal 61 is electrically connected to the negative electrode 31 of the electrode assembly 12 through a connection by caulking between the first caulking portion 61 b and the conductive member 51, and via the outer insulating member 57 and the inner insulating cover 55. The lid member 15 is clamped and fixed in an insulated state with respect to the lid member 15.

  The lid member 15 includes anti-rotation portions 15a on both ends in the direction in which the long side extends and outside the terminal insertion hole 15b. The anti-rotation portion 15a is a convex portion in which the metal plate of the lid member 15 is projected outward in a square shape by pressing. And in each rotation prevention part 15a, the external terminal 66 is arrange | positioned through the terminal insulating material 59 of the substantially covered square cylinder shape. The external terminal 66 is made of metal. The external terminal 66 has a rectangular box shape, and includes a base portion 66a into which the anti-rotation portion 15a is inserted via a terminal insulating material 59, and a pole column portion 66b protruding from the base portion 66a. The male column portion 66c is provided on the outer peripheral surface of the pole column portion 66b. The external terminal 66 and the lid member 15 are insulated from each other by the terminal insulating material 59.

  The secondary battery 10 has a rectangular flat connecting conductor 54. The connecting conductor 54 has a caulking portion insertion hole 54a at one end in the extending direction of the long side, and a pole column insertion hole 54b at the other end in the extending direction of the long side. The connecting conductor 54 has the pole column portion 66b of the external terminal 66 inserted into the pole column insertion hole 54b from the lid member 15 side, and the second crimp portion 61c of the auxiliary terminal 61 is covered with the crimp portion insertion hole 54a. It is inserted from the member 15 side. The second caulking portion 61 c is caulked outside the connection conductor 54. Therefore, although the connection conductor 54 is connected and fixed to the auxiliary terminal 61, the external terminal 66 has only the pole column part 66 b inserted through the pole column part insertion hole 54 b. Further, the connection conductor 54 is in contact with the base portion 66a of the external terminal 66 and is conductive.

  In the secondary battery 10, the positive external terminal 66 is electrically connected to the positive electrode tab group 36 of the positive electrode 21 through the connection conductor 54, the auxiliary terminal 61, and the conductive member 51. Therefore, the positive electrode terminal 16 is electrically connected at one end in the direction in which the long side of the conductive member 51 extends, and the positive electrode tab group 36 is electrically connected at the other end in the direction in which the long side of the conductive member 51 extends. It is connected. For this reason, the positive electrode terminal 16 can exchange electricity with the electrode assembly 12 via the conductive member 51.

  The negative external terminal 66 is electrically connected to the tab group 36 of the negative electrode 31 through the connection conductor 54, the auxiliary terminal 61, and the conductive member 51. Therefore, the negative electrode terminal 17 is electrically connected at one end of the conductive member 51 in the extending direction of the long side, and the negative electrode tab group 36 is electrically connected at the other end of the conductive member 51 in the extending direction of the long side. It is connected. Therefore, the negative electrode terminal 17 can exchange electricity with the electrode assembly 12 via the conductive member 51.

  Next, the welding apparatus 41 which joins the tabs 25 and 35 of each pole and the connection piece 53 of the conductive member 51 will be described. The welding device 41 is a device for resistance welding (spot welding) the connection piece 53 of the conductive member 51 and the tabs 25 and 35.

  As shown in FIG. 7 or 8, the welding device 41 includes a support column 42 and a mounting table 43 supported by the support column 42. The mounting table 43 includes a mounting surface 43 a for setting the electrode assembly 12 on the upper surface. The placement surface 43a is a flat horizontal surface and has a rectangular shape in plan view. Further, the welding apparatus 41 has a pair of protective plate mounting portions 44 integrated with the mounting table 43. The pair of protective plate placement portions 44 are integrated at a position along the long side close to the support column 42 among the pair of long sides of the placement surface 43a. The protection plate placement portions 44 are arranged at intervals in the direction along the long side of the placement surface 43a, and the tab laminate T of the positive electrode tab 25 is placed on one protection plate placement portion 44. Then, the tab laminate T of the negative electrode tab 35 is placed on the other protective plate placement portion 44. The protection plate mounting part 44 is made of an insulating material.

  The tab laminated body T means that the plurality of tabs 25 and 35 are stacked in each pole, and the plurality of tabs 25 and 35 are not gathered in the stacking direction. means. The protection plate mounting portion 44 includes an upper surface 44a that is flush with the mounting surface 43a, and includes a protection plate housing portion 44b that is recessed from the upper surface 44a. The plan view shape of the protection plate housing portion 44 b is a rectangular shape that follows the plan view shape of the protection plate 40. The protective plate 40 is accommodated in the protective plate accommodating portion 44b.

  When the shortest distance from the upper surface 44a of the protection plate mounting portion 44 to the inner bottom surface of the protection plate housing portion 44b is the depth of the protection plate housing portion 44b, the depth of the protection plate housing portion 44b is the same as the thickness of the protection plate 40. It is. Therefore, in a state where the protection plate 40 is accommodated in the protection plate accommodation portion 44b and the protection plate 40 is placed on the inner bottom surface of the protection plate accommodation portion 44b, the surface of the protection plate 40 faces the upper surface 44a of the protection plate placement portion 44. Become one. The protection plate mounting portion 44 includes an electrode insertion hole 44c that penetrates the bottom of the protection plate housing portion 44b in the vertical direction.

  The welding device 41 includes a pair of first actuators 45 fixed to the support pillar 42. The first actuator 45 is an air cylinder as a fluid pressure cylinder. The first actuator 45 includes a piston (not shown) that can move within the body 45a, and a rod 45b that is integral with the piston. The first actuator 45 includes a pair of supply / discharge ports (not shown). The piston moves in the body 45a by supplying and discharging air to the pair of supply and discharge ports. By this movement of the piston, the rod 45b advances and retreats with respect to the body 45a.

  The welding device 41 includes an attachment head 47 attached to the tip of the rod 45b of each first actuator 45. The mounting head 47 has a rectangular plate shape. The welding device 41 includes a first welding electrode 48, and the first welding electrode 48 is attached to the lower surface of one end portion in the longitudinal direction of the attachment head 47. The first welding electrode 48 is located above the protective plate housing portion 44 b in the protective plate mounting portion 44. The first welding electrode 48 is disposed in a state where the tip is directed downward (protective plate placement portion 44).

  The welding device 41 has an electrode-side spring 50 on the lower surface of one end portion in the longitudinal direction of the mounting head 47. The electrode-side spring 50 is attached to the attachment head 47 so as to surround the first welding electrode 48. The electrode-side spring 50 is a coil spring and can be expanded and contracted along the advancing / retreating direction of the rod 45b. One end in the axial direction of the electrode side spring 50 is fixed to the lower surface of the mounting head 47, and the pressing component 37 is fixed to the other end in the axial direction of the electrode side spring 50. Therefore, the pressing component 37 is supported by the rod 45 b of the first actuator 45 via the mounting head 47 and the electrode side spring 50.

  The pressing component 37 has a rectangular plate shape made of an insulating material. The pressing component 37 includes a through hole 37a surrounded by the electrode-side spring 50. The through hole 37a has a size that allows the first welding electrode 48 to be inserted and removed.

  The welding device 41 has a support bar 38 at the other longitudinal end of the mounting head 47. The support bar 38 is movable in the thickness direction of the mounting head 47. In addition, the welding device 41 includes a foil collecting part 39 attached to the tip of the support bar 38. The foil collecting part 39 is made of an insulating material and has an inverted L shape in a side view.

  The foil collecting part 39 has a rectangular plate-like base part 39a connected to the tip of the support bar 38, and a tab pressing part 39b integrated with the edge part of the base part 39a near the first welding electrode 48. Yes. In the protruding direction of the tab pressing portion 39b from the base portion 39a, the tip end portion in the protruding direction of the tab pressing portion 39b is from the lower surface of the pressing component 37 when the foil collecting component 39 and the pressing component 37 are not pressed at all. Also protrudes toward the protective plate mounting portion 44.

  The welding device 41 has a tab-side spring 39 c at the other longitudinal end of the mounting head 47. In the present embodiment, the tab side spring 39c is a spring attached to the rod 45b, and the electrode side spring 50 described above is a spring different from the tab side spring 39c. The tab-side spring 39c is integrated with the mounting head 47 so as to surround the support bar 38. The tab side spring 39c is a coil spring and can be expanded and contracted in the advancing and retracting direction of the rod 45b. One end of the tab side spring 39c in the axial direction is fixed to the lower surface of the mounting head 47, and the base portion 39a of the foil collecting part 39 is fixed to the other end of the tab side spring 39c in the axial direction. Therefore, the foil collecting component 39 is supported by the rod 45b of the first actuator 45 via the mounting head 47 and the tab side spring 39c.

  Then, the pressing component 37 and the foil collecting component 39 are movable in the direction in which the rod 45 b is advanced and retracted by the driving of the first actuator 45, and in the stacking direction of the tabs 25 and 35 in the tab stack T. Further, the first welding electrode 48 is movable in the direction in which the rod 45 b is advanced and retracted by the driving of the first actuator 45 and in the direction in which the tabs 25 and 35 are stacked in the tab stacked body T. Therefore, in this embodiment, the 1st actuator 45 comprises an actuator.

  The welding device 41 includes a pair of second actuators 74 fixed to the support column 42. Each second actuator 74 is an air cylinder as a fluid pressure cylinder. Each second actuator 74 is disposed at a position facing the first actuator 45 in the vertical direction. The second actuator 74 includes a piston (not shown) that can move within the body 74a, and a rod 74b that is integral with the piston. The second actuator 74 includes a pair of supply / discharge ports (not shown). The piston moves in the body 74a by supplying and discharging air to the pair of supply and discharge ports. By this movement of the piston, the rod 74b moves forward and backward with respect to the body 74a.

  The welding device 41 includes an attachment head 75 attached to the tip of the rod 74b of the second actuator 74. The mounting head 75 has a rectangular plate shape. The welding device 41 has a cylindrical second welding electrode 76 attached to the attachment head 75. The second welding electrode 76 is located below the electrode insertion hole 44 c in the protection plate mounting portion 44. The second welding electrode 76 is arranged with the tip directed upward (electrode insertion hole 44c). The second welding electrode 76 can be inserted into the electrode insertion hole 44 c of the protection plate mounting portion 44. The second welding electrode 76 is movable in the advancing / retreating direction of the rod 74 b and driving in the stacking direction of the tabs 25 and 35 in the tab stack T by driving the second actuator 74.

  The tab laminate T and the connecting piece 53 of the conductive member 51 are resistance-welded by the first welding electrode 48 integrated with the first actuator 45 and the second welding electrode 76 integrated with the second actuator 74. Therefore, in the present embodiment, the first welding electrode 48 and the second welding electrode 76 constitute a welded part, and the second actuator 74 also constitutes an actuator.

Next, the welding apparatus 41 and the welding method of the tab laminate T and the conductive member 51 will be described together with actions.
First, the lid terminal assembly 18 is manufactured by assembling various components integrally with the lid member 15.

  The shaft portion 57 c of the outer insulating member 57 is fitted into each terminal insertion hole 15 b of the lid member 15, and the shaft portion 57 c is inserted into the through hole 56 of the inner insulating cover 55, and then the auxiliary terminal 61 is inserted into the outer insulating member 57. While inserting the 1 crimp part 61b side, the base part 61a is accommodated in the auxiliary terminal recessed part 57b. Then, the conductive member 51 is disposed outside the inner insulating cover 55, the first caulking portion 61 b of the auxiliary terminal 61 is passed through the insertion hole 52 a of the conductive member 51, and then the first caulking portion 61 b of the auxiliary terminal 61 is caulked. The auxiliary terminal 61 is fixed to the lid member 15. At this time, each conductive member 51 is assembled to the inner surface of the lid member 15 in a state of being insulated from the lid member 15 by the inner insulating cover 55 by caulking of the first caulking portion 61b. Further, the auxiliary terminal 61 and the lid member 15 are insulated by the outer insulating member 57.

  Next, the terminal insulating material 59 is put on the rotation stopper 15 a and the rotation stopper 15 a is arranged inside the base 66 a of the external terminal 66. Next, the second caulking portion 61 c of the auxiliary terminal 61 is inserted into the caulking portion insertion hole 54 a of the connection conductor 54, and the pole column portion 66 b of the external terminal 66 is inserted into the pole column insertion hole 54 b of the connection conductor 54. .

  Then, as shown in FIG. 6A, the auxiliary terminal 61 and the external terminal 66 are connected by the connection conductor 54 by caulking of the second caulking portion 61c. At this time, the external terminal 66 is insulated from the lid member 15 by the terminal insulating material 59 and is prevented from rotating by the rotation preventing portion 15a.

  As shown in FIG. 6B, in the state where the conductive members 51, the auxiliary terminals 61, and the external terminals 66 are fixed to the lid member 15, the connection piece 53 is orthogonal to the inner surface of the lid member 15. It protrudes from the fixed piece 52 in a state. Then, the inner insulating cover 55, the conductive member 51, the connection conductor 54, the terminal insulating material 59, the auxiliary terminal 61, and the external terminal 66 are integrally assembled with the lid member 15 to assemble the lid terminal. A body 18 is constructed.

  Next, the positive electrode 21 and the negative electrode 31 are stacked with the separator 24 interposed therebetween to form the electrode assembly 12. Simultaneously with the formation of the electrode assembly 12, the tabs 25 and 35 of the respective electrodes are laminated to form a tab laminated body T.

  As shown in FIG. 8, in the welding apparatus 41, the rod 45b is immersed in the body 45a by the first actuator 45 and the mounting head 47 is separated from the protective plate placing portion 44, and the pressing component 37, the foil collecting component 39, and The first welding electrode 48 is separated from the protective plate mounting portion 44. Similarly, the rod 74 b is immersed in the body 74 a by the second actuator 74, and the mounting head 75 is separated from the protection plate placing portion 44 and the second welding electrode 76 is separated from the protection plate placing portion 44.

  Next, as shown in FIG. 9, the protection plate 40 is set in the protection plate housing portion 44 b of each protection plate placement portion 44. Next, the electrode assembly 12 is mounted on the mounting surface 43 a of the mounting table 43, and the tab laminate T of each electrode is mounted on each protection plate mounting portion 44. At this time, the first tab 351 in each tab laminate T is disposed on the protection plate 40 placed on the protection plate placement portion 44.

  Next, the connection piece 53 of each conductive member 51 in the lid terminal assembly 18 is placed on the second tab 352 of each tab laminate T. At this time, the inner surface 53 d of the connection piece 53 is brought into contact with the second tab 352. Then, the rod 45 b is protruded from the body 45 a by the first actuator 45, and the mounting head 47 is brought close to the protection plate mounting portion 44.

  First, the tip of the tab pressing portion 39 b of the foil collecting part 39 presses the second tab 352 of each tab laminate T prior to the pressing part 37. As shown in FIG. 10, the tip of the tab pressing portion 39b presses the base side of each tab 25, 35. Then, the plurality of tabs 25 and 35 are pressed toward one end in the stacking direction L of the electrode assembly 12 by the tab pressing portion 39b, and the plurality of tabs 25 and 35 are gathered together on one end side in the stacking direction L. . As a result, in the side view of the tab laminated body T along the juxtaposed direction X, the tab laminated body T has an L shape along the foil collecting part 39. Thereafter, when the base portion 39a comes into contact with the end face located at the other end in the stacking direction L of the electrode assembly 12, further pressing of the tab stacked body T by the tab pressing portion 39b is stopped.

  Further, as shown in FIG. 11, following the start of pressing of the tab laminate T by the pressing component 37, the pressing of the connection piece 53 by the pressing component 37 is started. The connecting piece 53 of the lid terminal assembly 18 is pressed against the tab laminate T by the pressing component 37. Here, since the tab laminated body T is already gathered to one end side in the laminating direction L by the pressing by the foil collecting part 39, the pressing part 37 further presses the gathered part in the tab laminated body T. It becomes.

  Then, the tabs 25 and 35 and the connection piece 53 are sandwiched between the upper surface 44 a of the protection plate mounting portion 44 and the pressing component 37 by pressing by the pressing component 37. Even after the base portion 39a of the foil collecting part 39 comes into contact with the end face of the electrode assembly 12, the first actuator 45 is driven, and the protrusion of the rod 45b is continued. At this time, the support bar 38 integrated with the foil collecting part 39 moves in the vertical direction of the mounting head 47, and the tab side spring 39c is compressed. For this reason, the pressing by the pressing component 37 is continued.

  In addition, the tab laminate T and the connection piece 53 are sandwiched between the pressing component 37 and the protective plate mounting portion 44, and the first actuator 45 is driven even after the pressing by the pressing component 37 is stopped, and the protrusion of the rod 45b continues. Is done. At this time, the electrode side spring 50 is compressed. Then, the first welding electrode 48 approaches the protective plate mounting portion 44, passes through the through hole 37 a of the pressing component 37, and contacts the outer surface 53 c of the connection piece 53.

  Simultaneously with the driving of the first actuator 45, the rod 74 b is protruded from the body 74 a by the second actuator 74, and the mounting head 75 is brought close to the protection plate mounting portion 44. Then, each second welding electrode 76 is inserted into the electrode insertion hole 44 c of the protection plate mounting portion 44, and the tip of the second welding electrode 76 is brought into contact with the protection plate 40.

  Then, when the tab laminate T and the connection piece 53 are sandwiched between the first welding electrode 48 and the second welding electrode 76, the driving of the first actuator 45 and the second actuator 74 is stopped. The connection piece 53 and the tabs 25 and 35 are resistance-welded by energizing between the first welding electrode 48 and the second welding electrode 76.

As a result, in each pole, a conduction portion W for conducting all the tabs 25 and 35 and the connection piece 53 is formed, and the lid terminal assembly 18 and the electrode assembly 12 are integrated.
Next, the connection piece 53 of each conductive member 51 is bent from the groove 53a. At this time, the groove 53a is folded so as to be a valley fold so that the connection piece 53 and the tabs 25 and 35 approach the second surface 52c of the fixing piece 52 assembled to the lid member 15. Then, the front end side of all the tabs 25 and 35 with respect to the conductive portion W is covered with the connection piece 53 from the electrode assembly 12 side. At the same time, all the tabs 25, 35 of each pole are bent at the leading end side from the conduction portion W as the connection piece 53 is bent.

  Then, all the tabs 25 and 35 of each pole are bent at the root side. When the electrode assembly 12 is inserted into the case member 14 and then the lid member 15 is joined to the open end of the electrode assembly 12, the case 11 is formed and the secondary battery 10 is formed.

According to the above embodiment, the following effects can be obtained.
(1) According to the welding device 41, the tab laminate T and the conductive member 51 can be welded by moving the pressing component 37, the foil collecting component 39 and the first welding electrode 48 by the first actuator 45. it can. That is, gathering of the tab laminate T, stacking of the tab laminate T and the conductive member 51, and welding can be performed collectively by the welding device 41. Welding work can be performed easily.

  (2) The tab side spring 39c is attached to the rod 45b of the first actuator 45 via the attachment head 47, and the foil collecting part 39 is supported by the tab side spring 39c. For this reason, even after the foil collection component 39 is in contact with the end face of the electrode assembly 12, the electrode assembly 12 is strongly pressed by the foil collection component 39 due to contraction of the tab side spring 39c. Can be suppressed.

  (3) The electrode-side spring 50 is attached to the rod 45 b of the first actuator 45 via the attachment head 47, and the pressing part 37 is supported by the electrode-side spring 50. For this reason, even after the movement of the pressing part 37 is stopped, the electrode-side spring 50 contracts, so that the first welding electrode 48 can penetrate the pressing part 37 and contact the tab laminate T. it can. In addition, even if there is a difference in height between the end surface of the electrode assembly 12 with which the foil collecting part 39 abuts and the tab laminated body T with which the pressing part 37 abuts, the tab side spring 39c contracts, Even after the movement of the foil component 39 is stopped, the pressing by the pressing component 37 becomes possible.

  (4) The welding device 41 is a device for resistance welding the tab laminate T and the conductive member 51, and includes a first welding electrode 48 that is moved by the first actuator 45, and is moved by the second actuator 74. Two welding electrodes 76 are provided. When the conductive member 51 is stacked on the tab laminate T, the first welding electrode 48 and the second welding electrode 76 do not get in the way.

  When the protective plate 40 is set on the protective plate mounting portion 44, the first welding electrode 48 is separated from the protective plate mounting portion 44 by the first actuator 45, and the second welding electrode 76 is moved by the second actuator 74. The protective plate mounting portion 44 can be separated from the vicinity. Therefore, when the protective plate 40 is set, the first welding electrode 48 and the second welding electrode 76 do not get in the way, and the protective plate 40 can be set.

  In addition, the second welding electrode 76 can be prevented from penetrating through the electrode insertion hole 44 c and protruding into the protection plate housing portion 44 b of the protection plate mounting portion 44. Therefore, when the protective plate 40 is accommodated in the protective plate accommodating portion 44b, the protective plate 40 can be prevented from projecting from the protective plate accommodating portion 44b or being tilted by the second welding electrode 76.

  (5) The welding apparatus 41 includes a protection plate mounting portion 44 that is integral with the mounting table 43. Then, the protective plate 40 is accommodated in the protective plate accommodation portion 44b of the protective plate placement portion 44, and the tab laminate T is placed on the protection plate placement portion 44, so that the tab laminate T and the protection plate 40 are stacked. can do. Therefore, for example, resistance welding using the protection plate 40 is facilitated as compared to the case where resistance welding is performed on the tab laminated body T in a state in which the protection plate 40 is overlapped by hand.

  (6) The welding device 41 can drive the pair of first welding electrodes 48 simultaneously and can drive the pair of second welding electrodes 76 simultaneously. A pair of conductive members 51 are integrated with the lid terminal assembly 18. Therefore, by using the welding device 41, both the connection pieces 53 of the lid terminal assembly 18 and both the tab laminates T of the electrode assembly 12 can be joined simultaneously. Therefore, the manufacturing time of the secondary battery 10 can be shortened compared with the case where the connection pieces 53 of the conductive member 51 are separately joined to the tab laminate T of each electrode.

  (7) The pressing component 37 and the foil collecting component 39 are driven by the first actuator 45 which is a common driving source. The foil collecting part 39 is supported by the rod 45 b of the first actuator 45 by the tab side spring 39 c, and the pressing part 37 is supported by the rod 45 b of the first actuator 45 by the electrode side spring 50. For this reason, even if the timing at which the pressing component 37 and the foil collecting component 39 stop is different, the tab laminated body T gathered by the foil collecting component 39 and the pressing component due to the contraction of the tab side spring 39c and the electrode side spring 50. 37, the conductive member 51 can be pressed.

  (8) The welding apparatus 41 includes a foil collecting part 39, and the foil collecting part 39 is integrally provided with a base portion 39a and a tab pressing portion 39b. The base portion 39a abuts against the end face of the electrode assembly 12, so that the pressing of the tab laminated body T by the tab pressing portion 39b can be restricted even if the rod 45b moves, and the tab pressing portion 39b is damaged. I can suppress it.

In addition, you may change the said embodiment as follows.
In the embodiment, the welding device 41 is used to weld the conductive member 51 and the tab laminate T assembled to the lid terminal assembly 18, but the welding target is not limited to this. Only the conductive member 51 before being assembled to the lid terminal assembly 18 and the tab laminate T may be welded using the welding device 41.

  In the embodiment, the welding device 41 moves the pressing component 37, the foil collecting component 39, and the first welding electrode 48 with each of the pair of first actuators 45, and the second welding electrode with each of the pair of second actuators 74. 76 was moved. However, the welding apparatus 41 is not limited to this, and the pressing part 37, the foil collecting part 39, and the first welding electrode 48 are moved by one first actuator 45, and the second welding electrode is moved by one second actuator 74. It is good also as a structure to which 76 is moved.

  In the embodiment, the pressing part 37 and the foil collecting part 39 are moved by one first actuator 45, but the present invention is not limited thereto. The pressing part 37 is moved by a pressing fluid pressure cylinder, the foil collecting part 39 is moved by a foil collecting fluid pressure cylinder, and the pressing part 37 and the foil collecting part 39 are moved by separate fluid pressure cylinders. Also good.

Further, the first welding electrode 48 may be moved by another fluid pressure cylinder.
The tab laminate T and the conductive member 51 may be resistance welded by the welding device 41 without using the protective plate 40.

  In welding apparatus 41, you may change one 1st welding electrode 48 among a pair of 1st welding electrodes 48 to the laser irradiation machine as welding parts. In this case, the second welding electrode 76 of the second actuator 74 is deleted. Then, the tab laminate T and the conductive member 51 are laser welded by the laser irradiated from the laser irradiator. Therefore, one of the pair of tab laminates T is joined to the conductive member 51 by laser welding, and the other is joined to the conductive member 51 by resistance welding.

  Further, in the welding apparatus 41, one of the pair of first welding electrodes 48 may be changed to an ultrasonic welder as a welding component. In this case, the second welding electrode 76 of the second actuator 74 is deleted. Therefore, one of the pair of tab laminates T is joined to the conductive member 51 by ultrasonic welding, and the other is joined to the conductive member 51 by resistance welding.

  (Circle) the 2nd welding electrode 76 does not need to be movable. In this case, the second welding electrode 76 is fixed in a state of being inserted into the electrode insertion hole 44c of the protection plate mounting portion 44, and when the protection plate 40 is set in the protection plate housing portion 44b, the protection is performed. The tip of the second welding electrode 76 is in contact with the plate 40.

In the welding apparatus 41, the protection plate mounting part 44 may not be provided. In this case, the protection plate 40 is stacked on the tab laminate T by manual work or the like.
The first actuator 45 and the second actuator 74 may not be an air cylinder as a fluid pressure cylinder, but may be a hydraulic cylinder or the like.

  The actuator is embodied as an air cylinder such as the first actuator 45 or the second actuator 74, but is not limited thereto. If the pressing part 37, the foil collecting part 39, and the welding electrodes 48 and 76 can be moved in the stacking direction of the tab laminate T, the actuator may be changed to an electric cylinder, a link mechanism, a cam mechanism, or the like.

  The protection plate mounting part 44 may be supported by the support pillar 42 so as to be positioned above the mounting surface 43 a of the mounting table 43. In the state where the protection plate 40 is set on the protection plate mounting portion 44, the protection plate 40 is set on the upper side of the tab laminate T. In this case, the pressing part 37, the foil collecting part 39, the first welding electrode 48, and the first actuator 45 serving as a driving source thereof are disposed below the tab laminated body T, and the second welding electrode is disposed above the tab laminated body T. 76 and the second actuator 74 are arranged.

  The electrode assembly may be a wound type in which a belt-like positive electrode and a belt-like negative electrode are wound around a winding axis while being insulated from each other. In the wound electrode assembly, the positive electrode has a positive electrode uncoated portion where the positive electrode active material is not applied along the long side which is one side of the positive electrode metal foil. Further, the positive electrode has a plurality of tabs having a shape protruding from a part of one side at intervals in the longitudinal direction. The negative electrode has a negative electrode uncoated portion where the negative electrode active material is not applied along the long side which is one side of the negative electrode metal foil. The negative electrode has a plurality of tabs having a shape protruding from a part of one side at intervals in the longitudinal direction.

  In the wound type electrode assembly, the positive electrode and the negative electrode are wound in an insulated state so that the tabs of the same polarity overlap each other, so that the winding axis of the electrode assembly extends in the extending direction. On one end side, the plurality of positive electrode tabs are stacked in the stacking direction of the electrode assembly, and the plurality of negative electrode tabs are stacked in the stacking direction of the electrode assembly.

The positive electrode 21 may have a positive electrode active material layer 23 on one side. Similarly, the negative electrode 31 may have a negative electrode active material layer 33 on one side.
The separator 24 may have a bag shape that accommodates the positive electrode 21 or the negative electrode 31.

In the case 11, the wall portion to which the positive electrode terminal 16 and the negative electrode terminal 17 are fixed may be a side wall or a bottom wall of the case member 14.
The secondary battery 10 is not limited to a lithium ion secondary battery, and may be another secondary battery such as a nickel hydrogen secondary battery or a nickel cadmium secondary battery.

  The power storage device is not limited to the secondary battery 10 and may be a capacitor such as an electric double layer capacitor or a lithium ion capacitor.

  T ... tab laminate, 10 ... secondary battery as power storage device, 11 ... case, 12 ... electrode assembly, 15 ... lid member as wall, 18 ... lid terminal assembly, 21 ... positive electrode as electrode 22a, 32a ... one side, 25, 35 ... tab, 31 ... negative electrode as an electrode, 37 ... pressing part, 39 ... foil collecting part, 39c ... tab side spring, 40 ... protective plate, 41 ... welding apparatus, 44 ... Protection plate mounting portion, 45 ... first actuator as actuator and fluid pressure cylinder, 45b ... rod, 48 ... first welding electrode as welding component, 50 ... electrode side spring, 51 ... conductive member, 53 ... connecting piece, 66 ... External terminal as an electrode terminal, 74 ... Second actuator as an actuator and fluid pressure cylinder, 76 ... Second welding electrode as a welded part, 351 ... First tab, 352 ... Second tab.

Claims (6)

Electrodes having tabs protruding from one side are stacked with electrodes of different polarities insulated from each other, a case for housing the electrode assembly, and a wall of the case In order to manufacture a power storage device comprising: an electrode terminal for transferring electricity to and from the electrode assembly; and a conductive member electrically connecting the tab and the electrode terminal, a tab stack in a state where the tabs are stacked A welding apparatus for welding a body and the conductive member,
In the tab laminate, a tab located at one end in the laminating direction is a first tab, and a tab located at the other end in the laminating direction is a second tab.
A pressing component that presses the conductive member against the second tab along the stacking direction;
Prior to pressing of the conductive member by the pressing component, the foil collecting component that collects the tab laminate in the stacking direction from the second tab toward the first tab;
A welded part for welding the tab laminate and the conductive member;
An actuator for moving the pressing component, the foil collecting component, and the welding component along the stacking direction ,
The welding part is a pair of welding electrodes for performing resistance welding,
The pressing component, the foil collecting component, and one welding electrode of the pair of welding electrodes are attached to the same actuator,
The welding apparatus in which the one welding electrode is in contact with the conductive member in a state of being pressed against the second tab by the pressing component .   The actuator includes a rod that can advance and retreat in the laminating direction, and a spring that is extendable and retractable along the advancing and retreating direction of the rod is attached to the rod, and the foil collecting component is supported by the spring. The welding apparatus according to claim 1, wherein another spring that is extendable and retractable along the forward / backward direction of the rod is attached to the rod of the actuator, and the pressing member is supported by the other spring. Before Symbol pair of welding electrodes welding apparatus according to claim 1 or claim 2 by separate said actuator is movable in the stacking direction. Electrodes having tabs protruding from one side are stacked with electrodes of different polarities insulated from each other, a case for housing the electrode assembly, and a wall of the case In order to manufacture a power storage device comprising: an electrode terminal for transferring electricity to and from the electrode assembly; and a conductive member electrically connecting the tab and the electrode terminal, a tab stack in a state where the tabs are stacked A welding apparatus for welding a body and the conductive member,
In the tab laminate, a tab located at one end in the laminating direction is a first tab, and a tab located at the other end in the laminating direction is a second tab.
A pressing component that presses the conductive member against the second tab along the stacking direction;
Prior to pressing of the conductive member by the pressing component, the foil collecting component that collects the tab laminate in the stacking direction from the second tab toward the first tab;
A welded part for welding the tab laminate and the conductive member;
An actuator for moving the pressing component, the foil collecting component, and the welding component along the stacking direction,
The welding parts are a pair of welding electrodes for performing resistance welding, and the welding electrodes can be moved in the stacking direction by the actuators,
In the resistance welding, a protective plate is interposed between the one welding electrode and the tab laminate in the laminating direction, and the welding apparatus includes the one welding electrode and the one in the laminating direction. welding apparatus Ru provided with a protective plate mounting portion for mounting the protective plate is arranged between the tab laminate. The wall portion, the pair of conductive members having different polarities, and the pair of electrode terminals having different polarities constitute a lid terminal assembly that is integrated in advance, and the conductive member is the lid terminal assembly. A connection piece protruding from the wall in
The welding apparatus includes a pair of the pressing part, the foil collecting part, and the welding part, and welds the connection piece and the tab laminate at two locations. A welding apparatus according to claim 1. Electrodes having tabs protruding from one side are stacked with electrodes of different polarities insulated from each other, a case for housing the electrode assembly, and a wall of the case In order to manufacture a power storage device comprising: an electrode terminal for transferring electricity to and from the electrode assembly; and a conductive member electrically connecting the tab and the electrode terminal, a tab stack in a state where the tabs are stacked A welding method for welding a body and the conductive member with a welding device,
The welding apparatus is a foil collecting component that gathers a plurality of tabs of the tab laminate in the stacking direction;
A pressing component that presses the conductive member against the tab laminate along the laminating direction;
A welded part for welding the tab laminate and the conductive member;
An actuator for moving the pressing component, the foil collecting component, and the welding component along the stacking direction,
The welding parts are a pair of welding electrodes for performing resistance welding, and the welding electrodes can be moved in the stacking direction by the actuators,
In the resistance welding, a protective plate is interposed between the one welding electrode and the tab laminate in the laminating direction, and the welding apparatus includes the one welding electrode and the one in the laminating direction. A protective plate placing portion disposed between the tab laminate and placing the protective plate;
In the tab laminate, a tab located at one end in the laminating direction is a first tab, and a tab located at the other end in the laminating direction is a second tab.
Placing the tab laminate on the protection plate placement portion so that the first tab is disposed on the protection plate placed on the protection plate placement portion;
The tab laminate is gathered from the second tab side to the first tab side by the foil collecting part,
After starting the gathering of the tab laminate by the foil collecting component, the conductive member is pressed against the first tab of the tab laminate by the pressing component,
A welding method, wherein the tab laminate and the conductive member are welded by the welding component.