JP2793787B2 - Welding method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a welding method used in a production line of a factory, and more particularly, to a positioning of a member to be welded which is performed in advance in welding.

[0002]

2. Description of the Related Art Generally, when welding is performed on a product production line such as a factory, welding members to be welded are positioned in advance by a jig or the like. For example, in a production line of a battery 1 with leads as shown in FIG.
When the lead piece 4 is welded to the electrode surface 3 of the battery body 2, the positioning is performed using the housing jig 5 as shown in FIG. 10 because the battery body 2 and the lead piece 4 are relatively lightweight. I was The accommodation jig 5 has an accommodation part 6 having a two-tiered structure in which the battery main body 2 is arranged on an upper part 6a of the accommodation part 6, and a lead piece 4 is arranged on a lower part 6b. The upper section 6a and the lower section 6b of the housing section 6 are formed in accordance with the outer shapes of the battery body 2 and the lead piece 4, respectively, and are easily positioned simply by inserting the battery body 2 and the lead piece 4 into the housing section 6, respectively. I can do it. on the other hand,
In welding, laser was irradiated from the back side through a through hole 7 formed in the bottom surface of the lower part 6b of the housing part 6 to perform welding. Further, as for welding of the lead piece 4 to the other side, after welding one lead piece 4, the welded battery body 2 is once taken out of the housing portion 6 of the housing jig 5, and the other lead piece 4 is welded. As described above, the battery main body 2 is positioned and welded by reversing and inserting the battery main body 2 into the housing jig 5 again.

[0003]

By the way, in general, in a product production line, the same type of product having different sizes and outer shapes is often handled in the same production line in terms of efficiency. In particular, the battery 1 with leads also corresponds to this, and batteries having different sizes are produced on the same production line.

However, when welding relatively light members to be welded, such as the lead pieces 4 and the battery body 2, positioning can be made very easily by being housed in a housing jig, but the outer shape and size of the member to be welded are different. Since individual jigs were required, the cost was increased. Also, if vibration or impact is applied to the housing jig due to a transport operation or the like, the member to be welded may jump out of the housing portion and cause a positional shift, so there is not much gap between the member to be welded and the housing portion, that is, Since no space is formed and the receiving portion is formed deep in the bottom, it takes time to insert the member to be welded.
Further, in the case of the battery 1 with a lead, when the lower portion 6b of the housing portion 6 is formed deep in the bottom, a considerable gap is formed between the lead piece 4 and the battery body 2, so that a sufficient adhesion state is ensured. This was a cause of poor welding.

The present invention has been made in view of the above circumstances, and an object of the present invention is to enable easy and reliable positioning of a member to be welded in welding.
An object of the present invention is to provide a welding method that can be reliably and easily transported to a welding position while being positioned.

[0006]

According to the welding method according to the present invention in order to achieve the above object, according to an aspect of, Tokoro along the longitudinal direction
Adhesive strips with a large number of through holes at regular intervals
Welding method in which the transport system engages the holes and performs welding while transporting
And a first step of temporarily attaching a thin and thin first welded member to the adhesive surface of the adhesive strip so as to be exposed from the through-hole, and A second step of temporarily attaching a lightweight second welded member to the adhesive surface of the adhesive strip at a position overlapping and facing the through-hole; and from a side of the adhesive strip opposite to the adhesive surface. A third step of irradiating the first and second members to be welded by irradiating a laser toward the through-hole, and bonding the first and second members to be welded to the adhesive band body; And a fourth step of peeling off from the adhesive surface. Further, the transport system includes a sprocket that engages with the through hole.
It is preferred to have a bracket.

In particular, it is preferable that the first member to be welded is a lead piece of a battery and the second member to be welded is a small flat battery.

[0008] Preferably, the adhesive strip is a paper tape.

[0009]

In the welding method according to the present invention, the first and second members to be welded are both fixed to the adhesive band so that the positioning can be performed easily and reliably. By moving the entire band, the members to be welded can be easily transported to the welding position with the two members to be welded positioned. Further, in welding, the first member to be welded is sandwiched between the adhesive band body and the second member to be welded, and the first and second members to be welded are sufficiently adhered to each other while the adhesive band is adhered. Since the laser is irradiated through the through-hole of the body, welding can be performed well.

In particular, even when the first and second members to be welded are a small flat battery and its lead piece, respectively, and the welding method according to the present invention is applied to assembling a battery with a lead, the above-mentioned effect is obtained. Can be played.

Further, since the adhesive strip is a paper tape, the adhesive strip can be constructed at relatively low cost.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a welding method according to the present invention will be described with reference to the accompanying drawings. In the welding method according to this embodiment, laser welding is performed by positioning two members to be welded using an adhesive strip 12 having an adhesive surface 10 as shown in FIG. The adhesive strip 12 is formed by forming an adhesive face 10 on the surface of a plastic strip-shaped base material, and the adhesive face 10 is set to have such adhesive strength that a member to be welded can be attached and detached. Further, the material of the band-shaped substrate,
A member that can fix and hold the member to be welded is selected according to the weight of the member to be welded. On the other hand, the adhesive surface 1 of the adhesive strip 12
At 0, a large number of through holes 14 are formed at predetermined intervals along the longitudinal direction of the adhesive strip 12.

In this embodiment, the welding method will be described in detail by actually applying it to the assembly of a battery with leads. The assembly of a battery with leads is a work of welding lead pieces to both sides of a flat small battery, that is, both electrode surfaces of a positive electrode and a negative electrode. Here, since both the battery and the lead piece as the members to be welded are lightweight, it is possible to use a paper tape having a low tensile strength as the adhesive band. Paper tape has a small expansion and contraction deformation rate and high positioning accuracy.
Since it is very inexpensive and economical, the manufacturing cost can be reduced, and it is most suitable for assembling a battery with leads.
The other adhesive strip may be a cloth or vinyl tape. The back side of the adhesive surface of the adhesive tape is a non-adhesive surface, and the adhesive tape can be wound.

The welding operation of the lead piece to the battery is shown in FIG.
It comprises four main steps of a lead attaching step, a battery attaching step, a welding step and a peeling step shown in (a) to (d),
The assembly proceeds in the following order. First, in the lead sticking step, as shown in FIG. 2A, a thin plate-like elongated lead piece 26 is disposed on the adhesive surface 22 of the adhesive tape 20 so as to cross one through hole 24, and this is attached. Through hole 2
4 and then temporarily attached. Next, in the battery sticking step, as shown in FIG. 2B, a flat battery 28 is overlapped with the temporarily fixed lead piece 26 and opposed to the through-hole 24 so that the flat battery 28 is Adhesive surface 2
Affix to 2 and temporarily fasten. Further, in the welding process, FIG.
As shown in (c), the laser irradiator 30 is arranged on the surface to which the adhesive tape 20 is attached, that is, on the side opposite to the adhesive surface 22,
A laser is irradiated from the laser irradiator 30 toward the through hole 24 to weld and connect the lead piece 26 to the battery 28. Then, in the peeling step, as shown in FIG. 2D, the battery 28 to which the lead piece 26 is welded is attached to the adhesive tape 2.
0 from the adhesive surface 22.

FIG. 3 schematically shows an assembly line 32 of a battery with leads for performing the welding operation in a series. In the assembly line 32, the adhesive tape 20 is used as a transport band, and transport systems 34a and 34b transport the attached battery 28 and lead pieces 26 between the respective steps.
Is configured. Particularly, in this assembly line 32, the lead pieces 2 are simultaneously applied to both the positive electrode and the negative electrode of the battery 28.
6 are performed, and two individual transport systems 34a and 34b corresponding to the positive electrode side and the negative electrode side, respectively, are configured. Further, the adhesive tape 20 is wound in a roll shape in advance to form supply hoops 36a and 36b, and is disposed at the lower left of FIG.

In the positive electrode transport system 34a, the adhesive tape 20 is sequentially fed and supplied from the supply hoop 36a, and sequentially passes through the respective steps of a lead attaching step, a battery attaching step, a welding step, and a peeling step. And is wound up and collected by a collection hoop 38a located at a position indicated by a circle. Further, the negative electrode transport system 34b is configured to supply the adhesive tape 20 from the supply hoop 36b.
Are sequentially fed out and passed through a lead attaching process,
Merges with the positive electrode transport system 34a in the battery attaching step,
Thereafter, in the welding step and the peeling step, the positive electrode transport system 34 is used.
In parallel with a, these steps are passed, and finally, the paper is wound and collected by a collection hoop 38b located on the right side of the drawing. The feeding of the adhesive tape 20 from the two supply hoops 36a and 36b is performed continuously and at a constant predetermined speed. Between the supply hoops 36a, b of each of the transport systems 34a, b and the recovery hoops 38a, b, that is, during transport, the guide rollers 40 or the sprockets 42, 44 are disposed in contact with the adhesive tape 20. By rotating these, the adhesive tape 20 is sent out and guided, and the transport direction is changed and the transport direction is corrected halfway. That is,
Protrusions 43 are formed on the outer peripheral surfaces of the sprockets 42 and 44 at predetermined intervals along the circumferential direction so as to be inserted into and engaged with the through holes of the adhesive tape 20, so that the adhesive tape 20 can be relayed and sent out. . At this time, the adhesive tape 2
Since a tension can be applied to 0, it is possible to secure a tensioned state, and it is possible to prevent its bending. Further, on the outer peripheral surface of the sprocket 44, a concave portion 44a is formed between each of the projections 43 so as to be able to accommodate the conveyed article of the adhesive tape 20, that is, the battery 28 and the lead piece 26. .

The adhesive tapes 20 respectively fed from the supply hoops 36a, 36b of the positive and negative electrode transfer systems 34a, 34b are:
It is sent to the lead attaching step via the guide roller 40. In the lead sticking step, a punch 46 is arranged above the adhesive surface 22 of the adhesive tape 20 as shown in FIG. 3, and a skeleton material as shown in FIG. 48 is disposed parallel to the adhesive surface 22 of the adhesive tape 20. The skeleton material 48 is a thin stainless steel plate having a thickness of about 0.2 mm, and is formed in a band shape. An intermediate portion along the longitudinal direction thereof is connected to both end portions 48 a of the skeleton material 48. A large number of lead portions 48b are integrally formed side by side. Then, the skeleton material 48 is sequentially fed and supplied from the winding roll 49, and a portion surrounded by a two-dot chain line as shown in FIG. The piece 26 is formed.

The punch 46 is vertically moved up and down with respect to the skeleton material 48 to punch a lead piece. Then, the punch 46 further descends while holding the punched lead piece 26 at the lower end, and presses the lead piece 26 against the adhesive surface 22 of the adhesive tape 20 located below the skeleton material 48 as it is. Attach.

The lead piece 26 formed by the punch 46 is used.
5, a block-like rack 52 is arranged on the lower surface of the sticking position 50 of the adhesive tape 20 as shown in FIG. A plurality of engagement protrusions 5 are provided on the upper surface of the rack 52.
4 are formed at predetermined intervals along the longitudinal direction of the adhesive tape 20. When the rack 52 comes closer from below the adhesive tape 20 when attaching the lead piece 26 of the punch 46, the two engaging projections 54 sandwich the attaching portion 50 of the lead piece 26 of the adhesive tape 20, It is inserted into each of the through holes 24 located on both sides. Since the rack 52 is translated in accordance with the feed of the adhesive tape 20 while the engaging projection 54 is in the inserted state, there is no particular effect on the feed of the adhesive tape 20. Thereby, the adhesive tape 20 is fixed on both sides of the sticking point 50 and the sticking point 5
At 0, a tensioned state is ensured. Thereby, the reaction force against the pressing of the punch 46 can be ensured, so that the bending of the adhesive tape 20 can be prevented, the lead piece 26 can be satisfactorily adhered, and the influence on other processes can be reduced. Can also be reduced. The rack 52 shown in FIG. 5 is detached downward from the adhesive tape 20 along the arrow A after the punch 46 is attached, moves backward in the feed direction of the adhesive tape 20, and moves to the position of the next attaching portion 50. As a result, the engaging protrusion 54 is again inserted into the through-hole 24, and the operation of translating the adhesive tape 20 in the feeding direction is repeated.

As shown in FIG. 3, the adhesive tape 20 of the positive electrode transport system 34a transports the attached lead piece 26 to a battery attaching step. In the battery sticking step, the battery sticking device 56 sticks the battery 28 supplied from the battery supply means (not shown) to the adhesive tape 20. Battery sticking device 56
So that the positive electrode surface of the battery 28 overlaps the lead piece 26,
The battery 28 is stuck to the adhesive surface 22 of the adhesive tape 20 by pressing it against the adhesive surface 22, and temporarily attached thereto. Also, when attaching this,
The rack 52 is arranged on the back side of the sticking point 50 of the adhesive tape 20, and the tension state of the sticking point 50 of the adhesive tape 20 can be ensured, and the bending of the adhesive tape 20 can be prevented. Then, when the battery 28 is attached, the adhesive tape 20 is attached to both sides of the battery 28 where the lead pieces 26 are attached as shown in FIG. 6, and the lead piece 26 is attached to the battery 28 and the adhesive tape 20. And the positive electrode surface 28a of the battery 28 and the side surface of the lead piece 26 come into close contact with each other. The adhesive tape 20 to which the battery 28 is attached is fed and guided by the sprocket 44 while the battery 28 is housed in the concave portion 44a of the sprocket 44,
Sent to the welding process.

On the other hand, the adhesive tape 20 of the negative electrode transport system 34b
Is fed out from the supply hoop 36b via the guide roller 40, and after the lead piece 26 is attached in the lead attaching step, merges with the positive electrode transport system 34a to which the battery 28 is attached. At the time of this joining, the attaching device 58 connects the lead piece 26 of the negative electrode transport system 34b to the battery 2 of the positive electrode transport system 34a.
The adhesive tape 20 of the negative electrode transport system 34 b is attached to the negative electrode surface 28 b of the battery 28 so as to overlap the negative electrode surface of No. 8. As a result, the battery 28 has the two adhesive tapes 2 of the positive electrode transport system 34a and the negative electrode transport system 34b as shown in FIGS.
0, and the lead piece 26 comes into close contact with the positive electrode surface 28a and the negative electrode surface 28b of the battery 28 with the adhesive tape 20 interposed therebetween.

Next, the battery 28 sandwiched between the two adhesive tapes 20 is transported to a welding process. In this welding process,
As shown in FIG. 8, lasers are simultaneously emitted from the laser irradiators 30 disposed on both sides of the battery 28 sandwiched between the two adhesive tapes 20 toward the through holes 24 of the adhesive tapes 20 on the positive electrode side and the negative electrode side, respectively. Irradiated, the lead piece 26
8 are connected by welding to the positive electrode surface 28a and the negative electrode surface 28b, respectively.

When welding is completed, the welded battery 28 is sent to a peeling step while being sandwiched between two adhesive tapes 20. In the peeling step, the adhesive tape 20 of the negative electrode transport system 34b is turned by the guide roller 40, separated from the adhesive tape 20 of the positive electrode transport system 34a, and wound and collected by the collection hoop 38b. The battery 28 remains on the positive electrode transport system 34a due to the adhesion balance between the two adhesive tapes 20. Then, by placing the rack 52 on the back side of the sticking position of the adhesive tape 20, the battery sticking position is fixed, the adhesive surface of the battery 28 is pressed, and the battery 28 is peeled from the adhesive surface 22 of the adhesive tape 20. You. The adhesive tape 20 is wound and collected by a collection hoop 38a via a guide roller 40. Thereby, the battery 29 with the lead is taken out as the battery 28 to which the lead piece 26 is welded,
The assembly of the battery 29 with the lead is completed.

As described above, in this embodiment, when welding the lead piece 26 to the battery 28, the battery 28 and the lead piece 26 can be easily and reliably positioned by fastening the lead piece 26 to the adhesive tape 20. Further, by moving the adhesive tape 20 in a state where the battery 28 and the lead piece 26 are fixed together, the adhesive tape 20 can be easily transported to the welding position in a state where they are positioned. The displacement can be prevented, and the manufacturing speed of the battery 29 with leads can be increased.

Further, since a sufficient adhesion between the battery 28 and the lead piece 26 is ensured, the lead piece 2
6 can be reliably welded. Further, even when assembling other batteries with leads having different sizes, the same adhesive tape 20 can be used to cope with the assembling, and the manufacturing cost can be reduced. Also, by using the adhesive tape 20 to constitute the transport systems 34a and 34b, the assembly line 3
2 can be simplified and the transfer direction can be easily changed, so that the assembly line 32 can be easily constructed.

The through hole 24 of the adhesive tape 20 can be used not only as a laser light passage hole at the time of laser welding, but also used for feeding the adhesive tape 20 by engaging with a sprocket 44. When attaching the battery 28 and the lead piece 26, the battery 28 and the lead piece 26 can be inserted into the engaging projections of the rack and used for positioning.

Further, in the assembly line 32, even in the case of performing mixed production in which batteries 28 of various sizes and shapes are mixed, it has conventionally been troublesome to arrange the housing jigs in the order of assembly in advance. In comparison, since there is no necessity, mixed production can be easily performed.

The adhesive tape 20 wound around the recovery hoops 38a and 38b can be disposed as the supply hoops 36a and 36b and reused as long as the adhesive strength is maintained.

The adhesive tape 20 may be connected to both ends to form an annular transport system. The feeding of the adhesive tape 20 from the supply hoops 36a, 36b may be intermittent instead of continuous.

[0030]

As described in the above embodiments, in the welding method according to the present invention, since the first and second members to be welded are fixed to the adhesive strip and positioned, the housing member is fixed. Positioning can be performed more easily and more reliably than in the conventional case of positioning by inserting into a tool, positioning work can be reduced, and working time can be shortened. In addition, by moving the adhesive strip together with the members to be welded together, the members to be welded can be easily transported to the welding position in a state where both members are positioned, and the positional deviation due to vibration or impact can be reduced. Can be prevented. By using the adhesive strip for positioning and transport, even if the size and shape of both members to be welded are various, if a separate storage jig is required for each size or shape as in the past, However, since a single adhesive strip can be used, manufacturing costs can be reduced. Furthermore, since the first and second members to be welded are in a state of being in close contact with each other, laser welding can be performed satisfactorily, and poor welding can be prevented.

In particular, when the welding method is applied to the assembly of a battery with leads, the above-described operation and effect can be obtained, and the lead piece can be welded to the battery satisfactorily.

Further, since the adhesive strip is a paper tape, the adhesive strip can be formed at a low cost.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an adhesive band used in a welding method according to the present invention.

FIG. 2A is a perspective view showing a lead attaching step in assembling a battery with leads. (B) It is the perspective view which showed the battery sticking process in the assembly of the battery with a lead. (C) It is the perspective view which showed the welding process in the assembly of the battery with a lead. (D) It is the perspective view which showed the peeling process in the assembly of a battery with a lead.

FIG. 3 is a schematic diagram showing an assembly line of a battery with leads.

FIG. 4 is a front view showing a skeleton material.

FIG. 5 is a perspective view showing that a lead piece is attached to an adhesive tape.

FIG. 6 is a side view showing a state of a battery attached to an adhesive tape.

FIG. 7 is a front view showing a state of a battery sandwiched between two adhesive tapes.

FIG. 8 is a side view showing a state of a battery sandwiched between two adhesive tapes.

FIG. 9 is a plan view showing a battery with leads.

FIG. 10 is a longitudinal sectional view showing a state before welding in which a battery and a lead piece are housed in a conventional jig.

[Explanation of symbols]

REFERENCE SIGNS LIST 20 adhesive tape (adhesive strip) 22 adhesive surface 24 through hole 26 lead piece (first welded member) 28 battery (second welded member) 28 a positive electrode surface 28 b negative electrode surface 29 battery with lead 30 laser irradiator 32 Assembly Line 34a Positive Electrode Transport System 34b Negative Electrode Transport System 36a, b Supply Hoop 38a, b Recovery Hoop 40 Guide Roller 42 Sprocket 43 Projection 44 Sprocket 44a Depression 46 Punch 48 Punch 48 Skeleton 48a Both Ends 48b Lead 49 Winding Roll 50 Lead Sticking point 52 Rack 54 Engagement projection 56 Battery sticking device 58 Sticking device

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Akihide Izumi 5-36-11 Shimbashi, Minato-ku, Tokyo Inside Fuji Electric Chemical Co., Ltd. (72) Inventor Goe Yoshioka 5-36-11 Shimbashi, Minato-ku, Tokyo No. Fuji Electric Chemical Co., Ltd. (56) References JP-A-1-104489 (JP, A) JP-A-4-279290 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) ) B23K 26/00 310 B23K 26/02 H01M 2/30

Claims (4)

(57) [Claims] 1. A method according to claim 1 , wherein a large number of the plurality of light emitting elements are arranged at predetermined intervals along the longitudinal direction.
The adhesive strip (20) having the perforated hole (24) is attached to the adhesive strip (20).
A welding method that performs welding while the transport system engages and transports
The through-holes (24) are formed in the adhesive surface (22) of the adhesive strip (20 ).
A first step of temporarily attaching a light and thin first welded member (26) so as to be exposed from the first member; and a step of overlapping the first member to be welded (26) and passing through the through hole (24). The lightweight second welded member (28) is placed at the opposing position with the adhesive strip (2).
0) a second step of temporarily fixing the adhesive surface (22) to the adhesive surface (22), and irradiating a laser toward the through-hole (24) from a side of the adhesive band (20) opposite to the adhesive surface (22). A third step of welding the first and second members to be welded (26, 28), and attaching the welded first and second members to be welded (26, 28) to the adhesive band ( 20) The fourth release from the adhesive surface (22)
A welding method characterized by comprising: 2. A sprocket wherein said transport system engages with said through hole.
The welding according to claim 1, further comprising a ket.
Method. Wherein a said first member being welded battery of lead pieces (26), in claim 1 or 2, wherein the second member to be welded is characterized in that it is a flat small battery (28) Record
On the welding method. Wherein said adhesive strip body (20) according to claim 1, characterized in that a tape made of paper
Welding method.