JP6582937B2 - Storage device welding equipment - Google Patents

Description

  The present invention relates to a welding apparatus for a power storage device.

In recent years, lithium ion secondary batteries have been adopted not only as power sources for electronic devices but also as power sources for hybrid vehicles and electric vehicles.
Usually, an electrode assembly as a power generation element is accommodated in a battery case of a lithium ion secondary battery. The electrode assembly includes a positive electrode obtained by applying a positive electrode active material to a metal foil, and a negative electrode active material on the metal foil. And a separator as an insulating member interposed between the positive electrode and the negative electrode. As the electrode assembly, for example, there is a stacked electrode assembly, and the stacked electrode assembly has a structure in which a large number of positive electrodes, negative electrodes, and separators are alternately stacked so as to face each other.

  As a prior art of a welding apparatus for a power storage device, for example, a battery assembly jig disclosed in Patent Document 1 and a battery assembly apparatus using the battery assembly jig are known. In the battery assembly jig disclosed in Patent Document 1, the electrode assembly is sandwiched by the sandwiching member, the electrode assembly is positioned by the positioning member, and the electrode tabs provided on the electrode assembly are bundled by the forming claws. In the electrode plate welding process, the battery assembly jig containing the electrode assembly is conveyed to an electrode plate welder, and the positive electrode tab and the negative electrode tab are sequentially welded. At this time, since the electrode assembly accommodated in the battery assembly jig is set on the guide plate of the electrode plate welder with the positive tab and the negative tab held by the forming claws, the positive tab and the negative tab are misaligned. Can be prevented.

JP 2011-210529 A

  However, in the battery assembling jig and the battery assembling apparatus using the battery assembling jig disclosed in Patent Document 1, the pair of the positive electrode tab and the negative electrode tab protrude from the battery assembling jig to the outside, Not housed inside. Therefore, the spatter generated when welding one electrode tab of the pair of positive electrode tab and negative electrode tab is scattered around and the scattered spatter adheres to the other electrode tab that is not to be welded. There is a problem in that the spatter attached to the electrode tab enters between the electrode and the separator and breaks through the separator, thereby causing a short circuit of the electrode of the power storage device.

  The present invention has been made in view of the above problems, and an object of the present invention is to prevent spatter generated when welding an electrode tab as a welding target from adhering to the electrode tab as a non-welding target. The present invention provides a welding apparatus for a power storage device.

  In order to solve the above problems, the present invention includes a welding jig to which an electrode assembly having a pair of electrode tab groups is fixed, and a base to which the welding jig is fixed, and the pair of electrodes The tab group is a welding device for a power storage device that is exposed in a state where the electrode assembly is fixed to the welding jig, and one electrode tab group of the pair of electrode tab groups is a welding target, and the other When the electrode tab group is welded as a non-welding object, an electrode tab cover that covers the other electrode tab group is provided, and the outer peripheral surface of the outer peripheral portion of the electrode tab cover has adhesiveness.

  According to the present invention, when one electrode tab group is welded, the other electrode tab group to be welded is covered with an electrode tab cover having adhesiveness on the outer peripheral surface of the outer peripheral portion, so that spatter generated by welding is Even if it is scattered around the electrode tab group, spatter can be prevented from adhering to the other electrode tab group to be welded.

Moreover, the welding apparatus of said electrical storage apparatus WHEREIN: The said outer peripheral part of the said electrode tab cover is good also as a structure which is an adhesive sheet.
In this case, the outer peripheral surface of the outer peripheral portion of the electrode tab cover can be provided with adhesiveness easily and inexpensively.

In the above power storage device welding apparatus, the adhesive sheet may be made of butyl rubber.
In this case, the adhesive sheet has good adhesiveness, and the spatter can be reliably attached to the outer peripheral surface of the outer peripheral portion of the electrode tab cover and can be stuck to the outer peripheral surface.

In the above power storage device welding apparatus, the electrode tab cover may be made of butyl rubber.
In this case, the electrode tab cover itself has good adhesiveness, and the spatter can be securely attached to the outer peripheral surface of the outer peripheral portion of the electrode tab cover and stuck to the outer peripheral surface.

  The present invention provides a welding apparatus for a power storage device capable of preventing spatter generated when welding an electrode tab group to be welded from adhering to the electrode tab group to be welded.

1 is an exploded perspective view showing a power storage device according to a first embodiment of the present invention. It is a perspective view which shows the principal part of the electrode assembly of the electrical storage apparatus which concerns on the 1st Embodiment of this invention. It is a side view which shows the welding apparatus of the electrical storage apparatus which concerns on the 1st Embodiment of this invention. It is a perspective view which shows the jig | tool main body of the welding jig of the welding apparatus of the electrical storage apparatus which concerns on the 1st Embodiment of this invention. It is a top view which shows a part of welding jig of the welding apparatus of the electrical storage apparatus which concerns on the 1st Embodiment of this invention. (A) is a perspective view of the electrode tab cover of the welding apparatus of the electrical storage apparatus which concerns on the 1st Embodiment of this invention, (b) is the sectional view on the AA line in (a). It is a perspective view which shows the jig | tool main body of the welding jig of the welding apparatus of the electrical storage apparatus which concerns on the 2nd Embodiment of this invention. (A) is a perspective view of the electrode tab cover of the welding apparatus of the electrical storage apparatus which concerns on the 2nd Embodiment of this invention, (b) is the BB sectional drawing in (a).

(First embodiment)
Hereinafter, a welding apparatus for a power storage device according to a first embodiment of the present invention will be described with reference to the drawings.
In the present embodiment, a secondary battery welding device as a power storage device is illustrated. Specifically, the secondary battery of the present embodiment is a lithium ion secondary battery.

  A secondary battery 10 according to this embodiment shown in FIG. 1 includes a battery case 11 and a stacked electrode assembly 12 housed in the battery case 11. The electrode assembly 12 is a power generation element that generates battery functions such as charging and discharging. As shown in FIG. 2, the electrode assembly 12 is formed in a layered manner in which a plurality of rectangular sheet-shaped positive electrodes 21 and a plurality of rectangular sheet-shaped negative electrodes 22 are alternately stacked so as to face each other. Although not shown, the positive electrode 21 and the negative electrode 22 are insulated by interposing a separator as an insulating member between the positive electrode 21 and the negative electrode 22. The positive electrode 21 and the negative electrode 22 of this embodiment are the electrodes of the present invention.

  As shown in FIG. 2, the some positive electrode 21 is the same dimension, and is formed so that it may have the same structure. The positive electrode 21 includes a rectangular sheet-like positive electrode main body 23 and a belt-like positive electrode tab portion 24 that continuously protrudes from a part of one edge of the positive electrode main body 23 in the short direction. The positive electrode body 23 includes a positive electrode metal foil and a positive electrode active material layer formed by applying a positive electrode active material to both surfaces of the positive electrode metal foil. The positive electrode tab portion 24 is not coated with a positive electrode active material, and the positive electrode tab portion 24 is formed of only a positive electrode metal foil. The positive electrode metal foil of this embodiment is an aluminum foil.

  As shown in FIG. 2, the plurality of negative electrodes 22 have the same dimensions and are formed to have the same structure. The negative electrode 22 includes a rectangular sheet-like negative electrode main body 25 and a strip-shaped negative electrode tab portion 26 that continuously protrudes from a part of one edge of the negative electrode main body 25 in the short direction. The negative electrode main body 25 includes a negative electrode metal foil and a negative electrode active material layer formed by applying a negative electrode active material to both surfaces of the negative electrode metal foil. The negative electrode tab portion 26 is not coated with a negative electrode active material, and the negative electrode tab portion 26 is formed only of a negative electrode metal foil. The negative electrode metal foil of this embodiment is a copper foil. The positive electrode tab portion 24 and the negative electrode tab portion 26 of the present embodiment are electrode tabs of the present invention. The positive electrode main body 23 and the negative electrode main body 25 are the electrode main bodies of the present invention.

  As shown in FIG. 2, the positive electrode tab portions 24 are arranged in a row along the stacking direction of the electrode assemblies 12. Each negative electrode tab portion 26 is arranged in a row along the stacking direction like the positive electrode tab portion 24 so as not to overlap with the positive electrode tab portion 24 in the stacking direction. The plurality of positive electrode tab portions 24 form a positive electrode tab group 27, and the plurality of negative electrode tab portions 26 form a negative electrode tab group 28.

  As shown in FIG. 1, the positive electrode tab group 27 is joined together with the positive electrode conductive member 29 by resistance welding. The negative electrode tab group 28 is joined together with the negative electrode conductive member 30 by resistance welding. The positive electrode conductive member 29 is connected to the positive electrode terminal 31, and the negative electrode conductive member 30 is connected to the negative electrode terminal 32. Accordingly, the positive electrode tab group 27 is electrically connected to the positive electrode terminal 31 via the positive electrode conductive member 29, and the negative electrode tab group 28 is electrically connected to the negative electrode terminal 32 via the negative electrode conductive member 30.

  In the battery case 11, the electrode assembly 12 is accommodated such that the positive electrode terminal 31 and the negative electrode terminal 32 protrude from the battery case 11 and the outer side surface 36 of the electrode assembly 12 faces the inner side surface 33 of the battery case 11. Yes. An electrolyte is injected into the battery case 11. The lid 34 of the battery case 11 and the case body 35 are joined by laser welding, and the battery case 11 is sealed.

  Next, the welding apparatus 40 shown in FIG. 3 will be described. The welding device 40 is used when the negative electrode tab group 28 is joined by resistance welding in the electrode assembly process for assembling the electrode assembly 12. The same applies to the case where the welding device 40 is used when the positive electrode tab group 27 is joined by resistance welding, and the description thereof is omitted.

  As shown in FIG. 3, the welding apparatus 40 includes a base 41, a welding jig 42, a push plate 43, a lifting member 44, a first welding electrode 45, a second welding electrode 46, an electrode tab cover 73, and a support rod 74. Prepare. The base 41 is substantially plate-shaped and includes electrode holes 52 that penetrate from the upper surface 50 to the lower surface 51. The electrode hole 52 has a shape into which the second welding electrode 46 can be inserted.

  As shown in FIGS. 3 to 5, the welding jig 42 includes a jig body 53 and a jig cover 54. As shown in FIG. 4, the jig main body 53 has a substantially plate shape and includes a mounting portion 60 having a substantially rectangular shape. The mounting portion 60 includes a flat mounting portion 60 that faces the electrode assembly 12 to the outer surface 36 of the electrode assembly 12. On the outer edge portions of the four sides of the placement portion 60, substantially rectangular parallelepiped wall portions 61, 62, 63, 64, 65, 66 are provided.

  As shown in FIGS. 4 and 5, the wall portion 61 of the jig main body 53 is formed at the center of the outer edge portion of the placement portion 60. The wall portion 62 is formed so as to face the wall portion 61 at the outer edge portion and to be positioned at a corner portion of the placement portion 60. A notch 67 is formed between the wall 61 and the wall 62. The wall portion 63 is formed so as to face the wall portion 61 at the outer edge portion and to be positioned at a corner portion on the opposite side to the wall portion 62. A notch 68 is formed between the wall 61 and the wall 63. The wall 64 is formed at the center of another outer edge where the wall 62 is located. The wall 65 is formed at the center of another outer edge parallel to the outer edge where the wall 64 is located. The wall 66 is formed over another outer edge parallel to the outer edge where the wall 61 is located. The wall portion 61 includes an outer side surface 61 </ b> A, a side surface 61 </ b> C that faces the upper surface 61 </ b> B and the wall portion 62, and a side surface 61 </ b> D that faces the wall portion 63. The wall 62 includes an outer surface 62A, an upper surface 62B, and a side surface 62C that faces the side surface 61C. The wall 63 includes an outer surface 63A, an upper surface 63B, and a side surface 63C that faces the side surface 61D. The upper surfaces of the upper surfaces 61B, 62B, and 63B and the walls 64 to 66 are higher than the bottom surface 70 and have the same height.

  A cut portion 67 is formed between the side surface 61 </ b> C of the wall portion 61 and the side surface 62 </ b> C of the wall portion 62. A cut portion 68 is formed between the side surface 61D of the wall portion 61 and the side surface 63C of the wall portion 63. The notches 67 and 68 are spaces that communicate with the placement unit 60. As shown in FIG. 5, the notches 67 and 68 have shapes that can accommodate the positive electrode tab group 27 and the negative electrode tab group 28, respectively. Therefore, the jig main body 53 has the plurality of positive electrode main bodies 23 and the plurality of negative electrode main bodies 25 that are alternately stacked on the mounting portion 60 in a state in which the movement of the electrode assembly 12 is restricted in the longitudinal direction and the short direction. The positive electrode tab group 27 and the negative electrode tab group 28 can be accommodated in the cut portions 67 and 68, respectively.

  The jig cover 54 shown in FIG. 5 is a rectangular plate member, and is fixed to the jig main body 53 so as to cover the placement portion 60 and the wall portions 62 to 66 of the jig main body 53. When the electrode assembly 12 is accommodated in the jig body 53, the jig cover 54 includes the plurality of positive electrode bodies 23 and the plurality of negative electrode bodies 25 accommodated in the mounting portion 60 of the jig body 53. 53 is covered from above. The upper and lower surfaces of the positive electrode tab group 27 and the upper and lower surfaces of the negative electrode tab group 28 are exposed from the welding jig 42, and the distal ends of the positive electrode tab group 27 and the negative electrode tab group 28 are exposed from the welding jig 42. Yes.

  As shown in FIG. 5, the push plate 43 is a plate member having an L-shaped cross section, and includes a lower plate 47, a horizontal plate 48, and a pair of rectangular holes 71 formed in the lower plate 47. The push plate 43 covers the jig main body 53 that houses the electrode assembly 12, and specifically covers the upper surfaces 61 </ b> B, 62 </ b> B, 63 </ b> B and the notches 67, 68 of the jig main body 53. When the electrode assembly 12 is accommodated in the jig main body 53, the positive electrode tab group 27 and the negative electrode tab group 28 accommodated in the notches 67 and 68 extend from the notches 67 and 68 in the vertical direction of the jig body 53. It is possible to restrict movement to the outside along. The pressing plate 43 covers the jig body 53 containing the electrode assembly 12 and covers the upper surfaces 61B, 62B, 63B and the notches 67, 68 of the jig body 53 through the holes 71 of the pressing plate 43. Thus, portions exposed to the outside of the positive electrode tab group 27 and the negative electrode tab group 28 are to be welded by the welding device 40.

  As shown in FIG. 3, the elevating member 44 is a member that is attached to a welding apparatus main body (not shown) and can be raised and lowered with respect to the base 41. A first welding electrode 45 is attached to the elevating member 44. The first welding electrode 45 has a rod shape, a base end portion 77 is connected to the elevating member 44, and a distal end portion 72 can be inserted into one hole 71 of the pressing plate 43 by elevating the elevating member 44. When the electrode assembly 12 is accommodated in the jig main body 53, the distal end portion 72 of the first welding electrode 45 can come into contact with the upper surface of the negative electrode tab group 28 by the lowering operation of the elevating member 44.

  As shown in FIGS. 3, 6 (a), and 6 (b), an electrode tab cover 73 is attached to the elevating member 44 via a support rod 74. The electrode tab cover 73 has a rectangular shape with a rectangular cross section, and includes a main body portion 75 and an outer peripheral portion 76 shown in FIG. The outer peripheral portion 76 includes an outer peripheral surface 76A illustrated in FIG. 6B, and the outer peripheral surface 76A includes plate portions 80, 81, 82, and 83 illustrated in FIG. 6A. The plate portion 81 is a rectangular plate and is connected to the support rod 74 so as to extend in a direction perpendicular to the axis of the support rod 74. The plate portion 80 is a vertical plate extending downward from one end portion of the plate portion 81. The plate portions 82 and 83 are plates that extend perpendicularly to the plate portion 81 from the end portions on both sides of one end portion of the plate portion 81. The electrode tab cover 73 is open at portions facing the plate portion 80 and the plate portion 81. Further, the plate portion 82 includes a lower end portion 85 at a part extending from the plate portion 80 at an end portion parallel to the end portion connected to the plate portion 81, and a notch portion 84 at the other portion. Similarly, the plate portion 83 facing the plate portion 82 includes a lower end portion (not shown) and a notch portion (not shown) at a part of the corresponding end portion. The main body portion 75 is formed along the outer peripheral portion 76 on the inner peripheral side of the outer peripheral portion 76.

  The outer peripheral portion 76 of the electrode tab cover 73 shown in FIG. 6B is made of an adhesive sheet. The outer peripheral portion 76 is formed by adhering an adhesive sheet to the main body portion 75, and the outer peripheral surface 76A of the outer peripheral portion 76 has adhesiveness. The main body 75 is made of resin. The pressure-sensitive adhesive sheet is made of rubber, specifically, for example, butyl rubber.

  As shown in FIG. 3, the second welding electrode 46 is attached to the welding apparatus main body, and the distal end portion 86 of the second welding electrode 46 and the distal end portion 72 of the first welding electrode 45 are opposed to each other. The electrode hole 52 is inserted. When the electrode assembly 12 is accommodated in the jig main body 53, the second welding electrode 46 is in a position where the tip end portion 86 can contact the lower surface of the negative electrode tab group 28.

  Hereinafter, a welding method for joining the negative electrode tab group 28 using the welding apparatus 40 having the above configuration will be described. Since the welding method for joining the positive electrode tab group 27 is the same, the description thereof is omitted.

  The positive electrode 21 and the negative electrode 22 are alternately stacked to form the electrode assembly 12. The positive electrode main body 23 and the negative electrode main body 25 of the electrode assembly 12 are accommodated in the mounting portion 60, and the positive electrode tab group 27 and the negative electrode tab group 28. The electrode assembly 12 is placed on the jig main body 53 so that they are accommodated in the notches 67 and 68, respectively. With the electrode assembly 12 housed in the jig main body 53, the upper and lower surfaces of the positive electrode tab group 27 and the upper and lower surfaces of the negative electrode tab group 28 are exposed from the jig main body 53 at the notches 67 and 68. Then, the jig cover 54 is fixed to the jig main body 53 so as to cover the placement portion 60 and the wall portions 61 to 66 of the jig main body 53, and the welding jig 42 is formed.

  Next, the welding jig 42 that houses the electrode assembly 12 is placed on the upper surface 50 of the base 41. The electrode assembly 12 is in a position indicated by a one-dot chain line in FIG. The distal end portion 86 of the second welding electrode 46 is in contact with the lower surface of the negative electrode tab group 28. Further, the pressing plate 43 is fixed to the upper surface 61B of the wall portion 61 of the jig body 53, the upper surface 62B of the wall portion 62, and the upper surface 63B of the wall portion 61 in an overlapping manner. The jig body 53 is fixed to the base 41 with a pair of bolts 55.

  And the raising / lowering member 44 in the raising position shown by the solid line in FIG. 3 is lowered to the lowered position shown by the one-dot chain line. At this time, the electrode tab cover 73 attached to the elevating member 44 is aligned so that the notch portion 84 of the electrode tab cover 73 is in contact with the pressing plate 43 and the lower end portion 85 is in contact with the jig main body 53. The notch 67 of the jig body 53 is covered from above with the electrode tab cover 73, and the upper surface of the positive electrode tab group 27 is covered with the electrode tab cover 73, and the upper surface of the positive electrode tab group 27 is not exposed to the outside.

  3 is lowered to the lowered position indicated by the alternate long and short dash line, the tip 72 of the first welding electrode 45 is the upper surface of the negative electrode tab group 28 of the jig body 53. Current flows through the first welding electrode 45, the negative electrode tab group 28, and the second welding electrode 46. At this time, resistance heat is generated between the first welding electrode 45, the negative electrode tab group 28, and the second welding electrode 46, and the negative electrode tab group 28 is heated and melted, and further cooled, whereby the negative electrode tab group 28 are joined.

In the present embodiment, the following operations and effects are achieved.
(1) When the negative electrode tab group 28 was welded, the positive electrode tab group 27 that was not an object to be welded was covered with an electrode tab cover 73 having adhesiveness on the outer peripheral portion 76. Therefore, even if spatter is generated from the negative electrode tab group 28 made of copper foil by welding and scattered around the negative electrode tab group 28, the positive electrode tab group 27 is covered with the electrode tab cover 73. 27, but does not adhere to the outer peripheral surface 76 </ b> A of the outer peripheral portion 76 of the electrode tab cover 73. Therefore, when the negative electrode tab group 28 is welded, the electrode tab cover 73 can prevent spatter from adhering to the positive electrode tab group 27 that is not a welding target.

(2) The outer peripheral surface 76A of the outer peripheral portion 76 of the electrode tab cover 73 has adhesiveness. Therefore, the spatter adhering to the outer peripheral surface 76A of the outer peripheral portion 76 of the electrode tab cover 73 adheres to the outer peripheral surface 76A and remains on the outer peripheral surface 76A. Therefore, when the electrode tab cover 73 is removed from the welding jig 42, the spatter attached to the outer peripheral surface 76 A of the outer peripheral portion 76 of the electrode tab cover 73 falls from the electrode tab cover 73 due to vibration or the like and passes through the electrode tab cover 73. Adhering to the group 27 can be prevented.

(3) The outer peripheral portion 76 of the electrode tab cover 73 is an adhesive sheet that covers the plastic main body 75. Therefore, the outer peripheral surface 76A of the outer peripheral portion 76 of the electrode tab cover 73 can be easily and inexpensively provided with adhesiveness.

(4) The adhesive sheet is made of butyl rubber. Therefore, the outer peripheral surface 76A of the outer peripheral portion 76 of the electrode tab cover 73 has good adhesiveness, and the spatter can be reliably attached to the outer peripheral surface 76A of the outer peripheral portion 76 and stuck to the outer peripheral surface 76A of the outer peripheral portion 76. Therefore, it is possible to prevent spatter from adhering to the positive electrode tab group 27 via the electrode tab cover 73.

(Second Embodiment)
Next, a second embodiment will be described.
This embodiment is an example in which the electrode tab cover is mounted on the welding jig by the operator himself without attaching the electrode tab cover to the lifting device and moving it up and down and placing it on the welding jig. In the present embodiment, the same elements as those in the first embodiment will be described using the same reference numerals with reference to the description of the first embodiment.

As shown in FIG. 7, the wall portion 101 of the jig main body 100 is formed at the center of the outer edge portion of the placement portion 110. The wall portion 102 is formed so as to face the wall portion 101 at the outer edge portion and to be positioned at a corner portion of the placement portion 110. A notch 108 is formed between the wall 101 and the wall 102. The wall portion 103 is formed so as to face the wall portion 101 at the outer edge portion and to be positioned at a corner portion on the opposite side to the wall portion 102. A cut portion 109 is formed between the wall portion 101 and the wall portion 103. The wall 104 is formed at the center of another outer edge where the wall 102 is located. The wall 105 is formed at the center of another outer edge parallel to the outer edge where the wall 104 is located. The wall 106 is formed over another outer edge parallel to the outer edge where the wall 101 is located.

  The wall portion 101 includes an outer surface 101A, an upper surface 101B, a side surface 101C that faces the wall portion 102, and a side surface 101D that faces the wall portion 103. The wall 102 includes an outer surface 102A, an upper surface 102B, and a side surface 102C that faces the side surface 101C. The wall 103 includes an outer surface 103A, an upper surface 103B, and a side surface 103C that faces the side surface 101D. A cut portion 108 is formed between the side surface 101C of the wall portion 101 and the side surface 102C of the wall portion 102. A cut portion 109 is formed between the side surface 101D of the wall portion 101 and the side surface 103C of the wall portion 103. The notches 108 and 109 are spaces that communicate with the placement unit 110. The notches 108 and 109 have shapes that can accommodate the positive electrode tab group 27 and the negative electrode tab group 28 respectively. The wall portion 101 includes a groove portion 112 extending from the outer surface 101A to the inside along the side surface 101C on the upper surface 101B. The wall 102 includes a groove 111 extending from the outer surface 102A to the inside along the side surface 102C on the upper surface 102B.

  As shown in FIGS. 8A and 8B, the electrode tab cover 121 includes a main body portion 122 and an outer peripheral portion 123, and the outer peripheral portion 123 includes an outer peripheral surface 123A. The outer peripheral part 123 consists of an adhesive sheet. The pressure-sensitive adhesive sheet is made of rubber, specifically, for example, butyl rubber. The electrode tab cover 121 includes a cutout portion 124 and a lower end portion 125.

In the present embodiment, the following effects are obtained.
(7) The electrode tab cover 121 is placed on the welding jig 113 by the operator. At this time, the notch portion 124 of the electrode tab cover 121 is brought into contact with the pressing plate 43, and the placement portion 125 of the electrode tab cover 121 is fitted into the groove portions 111 and 112 of the jig main body 100. Therefore, the electrode tab cover 121 is positioned with respect to the jig main body 100 by the grooves 111 and 112 being restricted from moving in the direction perpendicular to the direction in which the grooves 111 and 112 extend on the upper surfaces 101B and 102B. Therefore, the electrode tab cover 121 can be easily positioned with respect to the jig body 100.

  The present invention is not limited to the above-described embodiment, and various modifications are possible within the scope of the gist of the invention. For example, the following modifications may be made.

In the above embodiment, the outer periphery of the electrode tab cover is a sheet-like member, but this is not restrictive. The outer peripheral surface of the outer peripheral portion may be adhesive, and the main body portion and the outer peripheral portion of the electrode tab cover may be integrally formed, and the electrode tab cover may be made of rubber, for example, butyl rubber. In this case, the same operation and effect as when the outer peripheral portion of the electrode tab cover is made of an adhesive sheet made of butyl rubber can be obtained.

In the above embodiment, the material of the outer peripheral portion of the electrode tab cover is butyl rubber, but this is not a limitation. Any self-adhesive force may be used. For example, silicon rubber may be used.

In the above embodiment, the electrode tab cover portion facing the horizontal plate 48 of the push plate 43 is an opening, but this is not the case. The portion of the electrode tab cover facing the horizontal plate 48 may not be opened, and the portion of the electrode tab cover facing the horizontal plate 48 may not be in contact with the horizontal plate 48.

In the above embodiment, the entire outer peripheral surface of the outer peripheral portion of the electrode tab cover is provided with adhesiveness. Only the outer peripheral surface of the outer peripheral portion of the electrode tab cover adjacent to the first welding electrode 45 and the negative electrode tab group 28 that is likely to be spattered and adhered may be provided with adhesiveness. The plate portion 82 of the electrode tab cover far from 28 may not have adhesiveness.

In the second embodiment, the electrode tab cover 121 is positioned with respect to the jig main body 53 by the groove portions 111 and 112, but this is not restrictive. It only needs to be able to regulate the movement of the electrode tab cover on the upper surface of the wall portion of the jig body, and includes two convex portions provided on the upper surface of the wall portion with a notch extending inward from the outer surface. The movement of the electrode tab cover in the direction perpendicular to the direction in which the convex portion extends on the upper surface of the portion may be restricted.

In the above embodiment, a plurality of electrode tabs are welded. For example, the electrode conductive member may be welded to a plurality of electrode tabs. In this case, a welding jig having a shape corresponding to the welding of the electrode conductive member may be used.

In the above embodiment, when the negative electrode tab group 28 is welded, the positive electrode tab group 27 that is not a welding target is covered with the electrode tab cover 73 having adhesiveness on the outer peripheral portion 76, but this is not the case. When welding a positive electrode tab group, you may cover the negative electrode tab group which is not a welding object with the electrode tab cover which has adhesiveness in an outer peripheral part. When welding the positive electrode tab group, the same operation and effect as when the negative electrode tab group is welded are obtained.

12 Electrode assembly 21 Positive electrode (as an electrode)
22 Negative electrode (as electrode)
23 Positive electrode body (as electrode body)
24 Positive electrode tab (as electrode tab)
25 Negative electrode body (as electrode body)
26 Negative electrode tab (as electrode tab)
40 welding device 41 base 42 welding jig 73, 121 electrode tab cover 76, 123 outer peripheral part 76A, 123A outer peripheral surface

Claims (4)

A welding jig to which an electrode assembly having a pair of electrode tab groups is fixed;
A base on which the welding jig is fixed;
The pair of electrode tab groups is a power storage device welding apparatus exposed in a state where the electrode assembly is fixed to the welding jig,
When welding one electrode tab group of the pair of electrode tab groups as a welding target and the other electrode tab group as a non-welding target, an electrode tab cover covering the other electrode tab group is provided,
The welding apparatus for a power storage device, wherein an outer peripheral surface of an outer peripheral portion of the electrode tab cover has adhesiveness.   The power storage device welding device according to claim 1, wherein the outer peripheral portion is an adhesive sheet.   The power storage device welding apparatus according to claim 2, wherein the adhesive sheet is made of butyl rubber.   The power storage device welding apparatus according to claim 1, wherein the electrode tab cover is made of butyl rubber.

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