WO2012077878A1 - Jig for welding battery electrode, welding apparatus, and welding method - Google Patents

Abstract

Provided are a jig for welding a battery electrode, a welding apparatus, and a welding method, and the jig includes: a first pressing unit which has a constant width, is positioned at one side of a welding target, and includes an embossing structure formed on a portion which is in contact with the welding target; and a pair of second pressing units which are positioned at the other side of the welding target and include embossing structures formed on portions which are in contact with the welding target, wherein the pair of second pressing units are separated from the first pressing unit as much as the distance corresponding to the width of the first pressing unit.

Description

Jig for welding battery electrodes, welding apparatus and method

The present invention relates to a welding device, and more particularly, to a jig for welding a battery electrode, a welding device and a method.

Secondary batteries are used in electric carts, electric vehicles, and the like, and with the spread of electric vehicles, the demand thereof is increasing day by day.

Representative examples of secondary batteries include lithium secondary batteries, and lithium secondary batteries are classified into lithium ion batteries using a liquid electrolyte and lithium polymer batteries using a polymer electrolyte. Lithium polymer batteries can be classified into fully solid lithium polymer batteries and gel polymer polymer batteries.

Lithium ion batteries using a liquid electrolyte are bulky and constrained by the use of a case, for example, a metal can, that can accommodate an electrolyte solution, and pose a risk of explosion. Accordingly, in recent years, a lithium polymer battery using a polymer electrolyte in which safety problems are solved is mainly used.

Lithium polymer batteries have evolved from batteries for small electronic products to large power batteries capable of supplying electric power for automobiles. A large power battery for an electric vehicle may be configured by connecting a plurality of unit cells in series or in parallel. To this end, the copper and aluminum electrodes used as electrodes are bonded or a plurality of electrode tabs are bonded to the busbar.

1 is a conceptual diagram of a typical lithium polymer battery.

As shown in FIG. 1, the unit cell 10 of the lithium polymer battery includes a plurality of electrodes in a plate shape, and these electrodes can be stacked up to several tens or more. The plate-shaped electrode has a structure in which the copper electrode tab 12 and the aluminum electrode tab 14 are alternately stacked, and a gel polymer or a solid polymer electrolyte 16 is filled between the electrodes. The unit cell 10 is packaged to accommodate the plate-shaped electrode and the polymer electrolyte 16.

Meanwhile, each of the copper electrode tabs 12 and the aluminum electrode tabs 14 constituting the unit cell 10 are bonded to the electrode leads, and the electrode leads protrude out of the package.

2 is a view for explaining an example of a general bonding method between the electrode tab and the electrode lead.

As shown in FIG. 2, a laser welding method may be used as one method for joining the electrode tabs 12 and 14 and the electrode leads 18 and 19.

To this end, welding is performed while the electrode tabs 12 and 14 and the electrode leads 18 and 19 are aligned, and the electrode tabs 12 and 14 and the electrode leads 18 and 19 are pressed in an upper side and a lower side. However, a gap may exist between the electrode tabs during the pressing process, and thus poor welding may occur due to poor heat transfer.

In order to solve this problem, it is possible to consider a method of increasing the time for transferring heat by controlling the welding speed at a low speed, but this may cause a decrease in productivity and a price increase in a mass production system.

Ultrasonic bonding methods have been devised to address the shortcomings of laser welding.

3 is a view for explaining another example of a general bonding method between the electrode tab and the electrode lead.

3 illustrates bonding the electrode tab and the electrode lead using ultrasonic waves. Ultrasonic waves are generated when the electrode tab and the electrode lead are pressed to allow mutual bonding.

However, the ultrasonic bonding method may be a suitable method when two bonding objects are used, but welding may not be performed properly when bonding three or more objects. In addition, since the electrode tab is a thin film, there is a problem that the electrode tab is broken or broken during the ultrasonic bonding process.

On the other hand, as described above, in the case of an electric vehicle requires a large amount of power, for this purpose, by connecting the completed unit cells in series or in parallel to increase the capacity.

For example, each unit cell having electrode leads protruding out of the package may be configured in a battery module capable of supplying a large capacity power by being connected in series or parallel to the busbar. Of course, the larger the number of unit cells connected, the higher the power can be obtained, the key to this case is a method of joining a plurality of electrode leads and the bus bar.

4 is an exemplary view of a busbar.

As shown in the drawing, the bus bar 20 includes a junction 22 joined to the electrode lead and a body 24 electrically connecting the unit electrode welded to the bus bar 20 to the outside.

5 and 6 are views for explaining the connection method between the electrode lead and the bus bar.

First, FIG. 5 shows a case where a plurality of unit cells are connected in parallel to a bus bar, and FIG. 6 shows a case where a plurality of unit cells are connected in series with a bus bar.

Regardless of how the electrode leads are connected to the busbars, the joining process can be performed without errors only if the busbars and the electrode leads are kept in close contact with no gaps.

7 is a view for explaining the concept of bonding the electrode lead and the bus bar, Figure 8 is a view for explaining a general electrode welding jig.

As shown in FIG. 7, a plurality of electrode leads 18 and 19 can be joined to one bus bar 20 by laser welding. In this case, a jig as shown in FIG. 8 may be used.

Referring to FIG. 8, a general electrode welding jig includes a first pressing means 30 and a pair of second pressing means 32 and 34. The first pressurizing means 30 is positioned below the welding object, and presses the object upwardly around the welding object, for example, an electrode tab-electrode lead or an electrode lead-bus bar. In addition, the second pressing means 32 and 34 are positioned within the thickness range of the first pressing means 30 above the object to press the object downward.

In a general jig, the first pressing means 30 has a flat surface in contact with the object. Therefore, when the first and second pressing means (30, 32, 34) in close contact and pressurization, two working points are generated in the upper and lower portions, respectively.

Accordingly, the gap A is generated without the objects being in close contact with each other at the welding site, that is, at the laser beam irradiation site between the second pressing means 32 and 34. The gap A may cause a laser beam to be reflected or heat loss, and in the worst case, welding may not be performed.

In order to solve this problem, a two-stage process of welding using a laser while the electrode lead and the busbar are in close contact with each other by ultrasonic bonding has recently been proposed. However, the unit cell is small in size, and the joining of the plurality of unit cells is performed at a narrow working radius. Therefore, it is difficult to properly configure an ultrasonic welding machine that requires a constant force and scale, and the system is also complicated, which has the disadvantage of increasing production speed and cost.

The present invention has a technical problem to provide a jig for welding a battery electrode that can be bonded to the electrode tab and the electrode lead, or the electrode lead and the bus bar at high speed without error.

Another object of the present invention is to provide a welding apparatus and method capable of minimizing the electrical resistance of the electrode tab and the electrode lead, or the electrode lead and the bus bar.

Battery electrode welding jig according to an embodiment of the present invention for achieving the above technical problem is a battery electrode welding jig, has a specified width, is located on one side of the object to be welded contact portion with the welding object embossed form First pressing means having; And a pair of second pressing means having a specified width and positioned on the other side of the welding object and having a contact portion with the welding object having an embossed form, wherein the pair of second pressing means includes the first pressing means. Spaced apart from each other by a distance corresponding to the width of the means.

Meanwhile, the battery electrode welding apparatus according to an embodiment of the present invention is a welding device for a first object made of aluminum and a second object made of copper, which is higher than a melting point of the first object and more than a melting point of the second object. A beam irradiator emitting a low energy laser beam; And an optical system that focuses the laser beam emitted from the beam irradiator and irradiates the contact portion of the first object and the second object.

On the other hand, the battery electrode welding method according to an embodiment of the present invention is a welding method for a first object made of aluminum and a second object made of copper, comprising the steps of contacting the first object and the second object; Emitting a laser beam of energy higher than the melting point of the first object and lower than the melting point of the second object; And condensing the laser beam and irradiating the contact portion of the first object and the second object.

In the present invention, the first pressurizing device is pressurized from the lower side to the upper side of the center of the welded part, while the second pressurizing device is pressed from the upper side to the lower side of both sides of the welded part to bring the electrode tab and the electrode lead or the electrode lead and the bus bar into close contact. Therefore, since the welding object can be laser-welded without a gap, the joining process can be advanced at high speed.

In addition, as the bonding process speeds up, productivity can be improved and cost reduction can be expected.

In addition, in the present invention, in joining the electrode tab and the electrode lead, or the electrode lead and the bus bar, laser welding is performed in a state in which the bonding shape of the object is shaped to have a substantially Y shape. At this time, the laser beam is irradiated to the side of the junction portion, the electrode tab and the electrode lead, or the electrode lead and the bus bar is bonded by the multiple reflection effect of the laser beam.

This is particularly effective for joining objects made of aluminum and copper. When the bonding shape of the object is shaped to have a substantially Y shape, and then irradiated with a laser beam of energy lower than the melting point of copper and lower than the melting point of aluminum, the liquefied aluminum becomes copper while the bonding object of the copper material maintains a solid phase. By spreading to the side and contacting two objects, the generation of the intermetallic compound can be suppressed.

In addition, since the bonding shape of the object has a Y shape, the laser beam may cause multiple reflections between the two objects, thereby joining the two objects even when the laser beam is irradiated or misaligned.

In addition, since welding is performed in a state in which the two electrodes are in close contact by the pressing means, the contact area between the two electrodes is increased, and as a result, there is an advantage that the electrical resistance can be lowered to the base material level.

1 is a conceptual diagram of a typical lithium polymer battery,

2 is a view for explaining an example of a general bonding method of the electrode tab and the electrode lead,

3 is a view for explaining another example of a general bonding method of the electrode tab and the electrode lead,

4 is an exemplary view of a busbar;

5 and 6 are views for explaining the connection method between the electrode lead and the bus bar,

7 is a view for explaining the concept of bonding the electrode lead and bus bar,

8 is a view for explaining a general electrode welding jig,

9 is a block diagram of a jig for welding a battery electrode according to an embodiment of the present invention;

10 is a view for explaining the principle of pressing the jig shown in FIG.

11 is a view for explaining a battery electrode welding method using a jig shown in FIG.

12 is another exemplary view of the first pressing means in the jig for battery electrode welding shown in FIG. 9;

13 is a configuration diagram of a battery electrode welding apparatus according to an embodiment of the present invention;

14 is a view for explaining the structure of the object to be applied to the battery electrode welding device shown in FIG.

15 is an exemplary view for explaining a joining structure of a welding object applied to the present invention;

16 is a flowchart illustrating a battery electrode welding method according to an embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings will be described an embodiment of the present invention in more detail. In the following description, the object may be an electrode tab and an electrode lead, or an electrode lead and a bus bar of a battery. In addition, a plurality of electrode tabs may be bonded to the electrode leads, and a plurality of electrode leads may be bonded to the bus bars.

9 is a block diagram of a jig for welding a battery electrode according to an embodiment of the present invention.

As shown in FIG. 9, the jig for electrode welding according to the exemplary embodiment of the present invention is located on the upper side of the first pressing means 210 and the bonding object 100 positioned below the bonding object 100. And a pair of second pressurization means (220, 230).

The first pressing means 210 is formed to have a designated width and the upper end, that is, the contact portion with the object 100 has a flat plate shape or an embossing shape. Then, the first pressing means 210 is disposed such that the center of the longitudinal axis thereof coincides with the junction of the object 100.

The shape of the welded portion of the side object 100 to which the first pressing means 210 is in contact, for example, an electrode lead or a welded portion of the bus bar, may be formed in a curved shape in advance, in which case the first pressing means ( The upper surface of the 210 may be a flat plate shape. Otherwise, that is, when the shape of the welded portion of the side object 100 to which the first pressing means 210 is in a straight line, it is preferable to manufacture the upper surface of the first pressing means 210 in an embossed form.

The second pressing means (220, 230) is formed to have a specified width, that is, the lower end, that is, the contact portion with the object 100 has an embossed form. In a preferred embodiment of the present invention, the pair of second pressing means (220, 230) are respectively disposed at both ends around the junction of the object 100, in particular corresponding to the width of the first pressing means (210) It can be arranged to be spaced apart from each other by a distance. In addition, the width of the second pressing means (220, 230) may be about 1/2 of the width of the first pressing means (210).

As described above, the welding jig according to the present invention is a battery electrode welding jig which is a three-point support jig using a first support point by the first pressing means and a second and third support point by the pair of second pressing means. Therefore, the plate members constituting the object 100 are pressed by the second pressing means (220, 230) with a force of F downward, and with a force of 2 F upwards by the first pressing means (210). The gap between them is minimized.

In one embodiment of the present invention, the upper center portion of the first pressing means 210 may be provided with a groove 212 of the specified width and depth.

The groove 212 may be formed to a width such that the action point received by the object 100 does not move when the first pressing means 210 is pressed upward, for example, a width of 1 to 2 mm. When the first pressing means 210 is provided with the grooves 212, the energy of the laser beam is high, so that the object 100 and the first pressing means 210 are prevented from being welded even when the laser beam is penetrated through the object 100. can do.

10 is a view for explaining the principle of pressing the jig shown in FIG.

The first and second pressing means 210, 220, 230 are positioned above and below the object 100, and the first and second pressing means 210, 220, 230 are pressed toward the object 100. Since the distance of the second pressing means (220, 230) is the same as the width of the first pressing means 210, one working point by the force (2F) applied to the lower side of the object 100 by the first pressing means (210) , Two working points are generated by the force F applied to the upper side of the object 100 by each of the second pressing means 220 and 230.

Therefore, the object 100 is in close contact with no gap in the central portion B of the first pressing means 210, and welds the plates constituting the object 100 by irradiating a laser beam at this position. At this time, the number of welding, that is, the number of welding lines may be one line or a plurality of lines.

By using the welding jig according to the present invention, the system can be simplified as compared with the current two-step process (laser welding after ultrasonic welding), and the welding speed can be increased, thereby improving productivity and reducing costs. You can get it.

FIG. 11 is a view for explaining a battery electrode welding method using the jig illustrated in FIG. 9.

FIG. 11 illustrates an example in which the electrode leads 18 and 19 provided in the plurality of unit cells 10 are bonded to the bus bars 20 using the jig illustrated in FIG. 9.

While the electrode leads 18 and 19 are disposed on the busbar 20, the first pressing means 210 is pressed upward while the second pressing means 220 and 230 are pressed downward, and the first pressing is performed. The laser beam is irradiated to the center of the means 210.

The object, that is, the force (F + F) applied from the upper side of the electrode leads 18 and 19 and the bus bar 20 and the force (2F) applied from the lower side of the object are in equilibrium, and are located on the center side of the pressurized part. The electrode leads 18 and 19 and the bus bar 20 may be in close contact with each other without a gap. When the laser beam is irradiated in this state, the object may be bonded at a high heat transfer rate.

Although not shown, the jig of the present invention may also be used when welding a plurality of electrode tabs to an electrode lead.

12 is another exemplary view of the first pressing means in the jig for battery electrode welding shown in FIG. 9.

The first pressing means 210 provided in the jig according to the present embodiment further includes an optical sensor 214 provided at the bottom of the groove 212.

In this case, the first pressing means 210 is preferably formed using copper. Copper has high reflectivity to the laser beam. Therefore, the laser beam irradiated from the upper side of the object passes through the object to reach the groove 212 of the first pressing means 210, causes a reflection phenomenon, and eventually reaches the optical sensor 214.

The operator may not only check whether the object is welded by the optical sensor 214 but also control the welding quality.

The above-described battery electrode welding jig can be applied to any conventional battery electrode laser welding device. Whatever the configuration of the battery electrode laser welding device, when the object, that is, the electrode tab and the electrode lead or the electrode lead and the bus bar by using the welding jig according to the present invention is pressed in the center of the first pressing device 210 It can be adhered without a gap to weld the object at high speed.

On the other hand, when one side of the welding object is made of aluminum material and the other side is made of copper material, the following laser processing apparatus is proposed by applying the difference between the melting point of aluminum and copper.

13 is a configuration diagram of a battery electrode welding apparatus according to an embodiment of the present invention.

As shown, the welding apparatus 300 according to an embodiment of the present invention is a control unit 310 for controlling the overall operation, the beam irradiator 330 for outputting the laser beam emitted from the light source 320 at a specified power and size ), A motor 340 for driving the optical system 350, an optical system 350 for condensing the laser beam output from the beam irradiator 330, and irradiating the contact point to the contact portion of the welding object, and pressing the object to be in close contact with the outside of the contact region of the object. And a pressing unit 360 to linearly move the first and second pressing means 362 and 364 and the first and second pressing means 362 and 364.

The optical system may be configured using a telecentric lens or an f-theta lens. The optical system reciprocates at high speed by the driving force of the motor 340 to irradiate a laser beam to the contact portion of the object. To be possible.

The first and second pressing means 362, 364 may be configured in a cylindrical or semi-cylindrical shape, the length can be determined in consideration of the width of the object. In addition, the diameters of the first and second pressing means 362 and 364 may be determined in consideration of the contact area of the object. Preferably, the wider the contact area between the first and second pressurizing means 362 and 364 and the object is, the more advantageous it is to widen the contact area between the objects.

Using the welding device 300, the pressing unit 360 is driven through the control unit 310. The pressing unit 360 moves the first and second pressing means 362 and 364 linearly to strongly adhere the object to be welded from the outside to the welding site.

In this state, the laser beam condensed by the optical system 350 is irradiated to the contact site of the object. In a preferred embodiment of the present invention, the laser beam is irradiated to the center portion of the contact portion, and the beam irradiated to the reflecting portion (414 or 424 in FIG. 14) outside the center portion can penetrate into the junction of the object by multiple reflection phenomenon. have.

When the temperature of the contact portion of the object rises to the preset temperature by the laser beam, the pressing unit 360 vertically raises the first and second pressing means 362 and 364 in the pressurized state by the rotational force. Accordingly, it is possible to enlarge the contact area for the object to be welded.

Aluminum and copper have very different melting points. That is, the melting point of copper is as high as 1,083 ℃ while the melting point of aluminum is relatively low as 646 ℃. Therefore, when the laser beam is irradiated with energy and time such that the aluminum is melted without melting the copper, the aluminum converted into the liquid phase diffuses to the copper side maintaining the solid phase, and the objects are welded to each other. That is, since copper maintains a solid phase, it can prevent that an intermetallic compound generate | occur | produces. In laser welding of aluminum and copper, an intermetallic compound is not produced when the composition ratio of aluminum is high, preferably when the copper content is 30% or less in a molecular equivalent ratio. Therefore, the welding apparatus according to the present embodiment further maximizes the efficiency when welding a plurality of electrode tabs made of aluminum and electrode leads made of copper, or welding a plurality of electrode leads made of aluminum and bus bars made of copper.

On the other hand, the first and second pressing means (362, 364) to be in close contact with the outside of the contact portion of the object strongly, and the laser beam is irradiated so that the temperature of the object, preferably the temperature of the object made of aluminum When the temperature rises, the pressing means 362 and 364 are rotated to vertically move upward. Therefore, not only the laser beam can be prevented from being irradiated, but also the contact area can be sufficiently secured.

In order to further improve the welding efficiency of the welding apparatus shown in FIG. 13, it is preferable to shape the object, that is, the electrode tab and the electrode lead, or the joint shape of the electrode lead and the bus bar to have a substantially Y shape.

14 is a view for explaining the structure of an object applied to the battery electrode welding device shown in FIG.

Referring to FIG. 14, the joining shape of the first object 410 and the second object 420 has a substantially Y shape. Here, the first object 410 may be an electrode tab or an electrode lead, and the second object 420 may be an electrode lead or a bus bar.

The first object 410 is a lead portion 412 which extends itself from the electrode tab or electrode lead, and a reflecting portion 414 which extends from the lead portion 412 itself and bends at a specified angle θ. ). Similarly, the second object 420 has a lead portion 422 which extends itself from the electrode lead or busbar and a reflecting portion which is configured to extend from itself and extend from the lead portion 422 to bend at a designated angle [theta]. 424.

Each of the reflecting portions 414 and 424 can be such that the bending angle θ is 0 ° θ <90 °, preferably 2 ° θ <45 ° with respect to the vertical side. In addition, it can be formed to be bent to the specified length (a; 0.2 ~ 5mm) on the opposite side of the contact site.

The first object 410 and the second object 420 are configured in the shape as shown in FIG. 14, and the respective lead portions 412 and 422 are joined from the outside by the pressing means 362 and 364 shown in FIG. 13. Pressurize to the site side.

In this state, a laser beam of energy lower than the melting point of copper and higher than the melting point of aluminum is irradiated through the beam irradiator 330, which is focused by the optical system 350, and irradiated to the contact sites of the two objects 410 and 420. do.

The optical system 350 irradiates a laser beam to a contact portion of the object while reciprocating at high speed by driving the motor 340, and the first and second pressing means 362 and 364 strongly adhere the object. Therefore, the object can be welded strongly without generation of the intermetallic compound. In addition, when the laser beam is irradiated and the temperature of the object rises to a preset temperature, the first and second pressurizing means 362 and 364 are raised by the rotational force to further improve the adhesion characteristics of the two objects 410 and 420. The contact area can be further enlarged.

Furthermore, when the objects 410 and 420 have a structure as shown in FIG. 14, the contact areas of the objects are secured by the lengths of the lead portions 412 and 422, thereby minimizing electrical resistance, while the two objects 410 and 420. ) Can be strongly contacted.

15 is an exemplary view for explaining a bonding structure of a welding object applied to the present invention.

As shown in FIG. 15, the first object 410 and the second object 420 may be shaped in various forms. Regardless of the shape of the first and second objects 410 and 420, the joints have a substantially Y shape. The laser beam is laterally irradiated from the upper ends of the first and second objects 410 and 420 joined in the Y shape to cause a multiple reflection phenomenon.

As a result, the laser beam is multi-reflected to penetrate into the lead portion, to secure the welding area by the length of the lead portion, thereby minimizing electrical resistance.

16 is a flowchart illustrating a battery electrode welding method according to an embodiment of the present invention.

First, a pair of objects 410 and 420 to be welded are aligned to be in contact with each other in a Y shape, and a control parameter including a laser output energy, an output time, and the like is set through the controller 310 (S10).

Subsequently, the pressing unit 360 is driven under the control of the control unit 310 (S20) to press the first and second pressing means 362 and 364 toward the contact portion side of the object 410 or 420.

In addition, the motor 340 is driven to reciprocate the optical system 350 (S30), and the laser beam of predetermined energy is irradiated to the optical system 350 through the beam irradiator 330 (S40).

The optical system 350 reciprocating by the motor 340 irradiates a laser beam of a predetermined energy to contact portions of the objects 410 and 420 for a predetermined time, at which time the first and second pressing means 362 364 presses the objects 410 and 420 toward the contact site side, and thus the leads 412 and 422 are kept in strong contact with each other.

The laser beam irradiated to the contact site dissolves aluminum and diffuses it to the copper side while causing multiple reflections between the objects 410 and 420, whereby the objects 410 and 420 are electrically connected.

As a result, the objects 410 and 420 may secure a contact area corresponding to the lengths of the leads 412 and 422, thereby minimizing electrical resistance. Furthermore, the object can be connected with excellent contact characteristics without causing copper to be dissolved or by minimizing dissolution information and dissolving only aluminum so that contact can be made.

In addition, when the laser beam is irradiated and the temperature of the object rises to a predetermined temperature, when the first and second pressing means 362 and 364 are raised by the rotational force, the adhesion characteristics of the objects 410 and 420 are further improved. The contact area can be further enlarged.

On the other hand, in a preferred embodiment of the present invention, the head of the optical system 350 constituting the welding device 30 and the first and second pressing means 362, 364 move to the same coordinate value in the X, Y, Z axis It can be designed to be. In this case, the arrival point of the laser beam and the weld line of the object to be welded can always be controlled identically. Therefore, it is very advantageous to build an automated system since no welding line tracking device is required.

As such, those skilled in the art will appreciate that the present invention can be implemented in other specific forms without changing the technical spirit or essential features thereof. Therefore, the above-described embodiments are to be understood as illustrative in all respects and not as restrictive. The scope of the present invention is shown by the following claims rather than the above description, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included in the scope of the present invention. do.

Claims (22)

1. Jig for battery electrode welding,

   First pressing means having a specified width and positioned on one side of the object to be welded; And

   A pair of second pressurizing means having a specified width and positioned on the other side of the welding object such that a contact portion with the welding object has an embossed shape;

   And a pair of second pressurizing means spaced apart from each other by a distance corresponding to the width of the first pressurizing means.
2. The method of claim 1,

   The first pressing means is a jig for welding the battery electrode of the contact portion with the object embossed form.
3. The method of claim 1,

   The first pressing means is a jig for welding a battery electrode, the contact portion with the object is flat.
4. The method of claim 1,

   The battery electrode welding jig is a three-point support jig using a first support point by the first pressing means, the second and third support points by the pair of second pressing means.
5. The method of claim 1,

   The first pressing means is a jig for welding a battery electrode having a groove formed in the upper center portion having a predetermined width and depth.
6. The method of claim 5,

   The first pressing means further comprises a light sensor formed on the bottom of the groove jig for welding the battery electrode.
7. The method of claim 1,

   The first pressing means is a jig for battery electrode welding is arranged so that the center of the vertical axis coincides with the welding portion of the welding target.
8. The method of claim 1,

   The width of each of the pair of second pressing means is a jig for battery electrode welding is 1/2 of the width of the first pressing means.
9. As a welding apparatus for the 1st object which consists of aluminum, and the 2nd object which consists of copper,

   A beam irradiator emitting a laser beam of energy higher than the melting point of the first object and lower than the melting point of the second object; And

   An optical system for condensing a laser beam emitted from the beam irradiator and irradiating the contact portion between the first object and the second object;

   Welding device for a battery electrode comprising a.
10. The method of claim 9,

    And the first object and the second object have a bonded shape substantially Y-shaped.
11. The method of claim 10,

    And the first object has an angularly curved reflecting portion designated at an end opposite to the contact portion at a terminal thereof.
12. The method of claim 11,

    And the second object has an angled reflecting portion specified at an end opposite to the reflecting portion of the first object.
13. The method of claim 9,

    First and second pressing means positioned outside the contact portions of the first object and the second object, respectively; And

    A pressing unit for moving the first and second pressing means toward the contact portion side;

    Welding device of a battery electrode further comprising.
14. The method of claim 13,

    And the pressing unit rotates the first and second pressing means in a rotational manner when the temperature of the first object rises to a preset temperature by the laser beam emitted from the beam irradiator.
15. The method of claim 13,

    And the first object and the second object have a bonded shape substantially Y-shaped.
16. The method of claim 13,

    The head of the optical system, the first and second pressing means are welding device of a battery electrode to move to the same coordinate value.
17. The method of claim 9,

    And the first object is at least one electrode tab and the second object is an electrode lead.
18. The method of claim 9,

    The first object is at least one electrode lead and the second object is a busbar welding device for a battery electrode,
19. A welding method for a first object made of aluminum and a second object made of copper,

    Contacting the first object and the second object;

    Emitting a laser beam of energy higher than the melting point of the first object and lower than the melting point of the second object; And

    Condensing the laser beam and irradiating the contact portion between the first object and the second object;

    Welding method of a battery electrode comprising a.
20. The method of claim 19,

    Prior to emitting the laser beam, bringing the first object and the second object into close contact with the first and second objects through the first pressing means and the second pressing means outside the contact portion of the first object and the second object toward the contact portion side. Welding method of a battery electrode further comprising.
21. The method of claim 20,

    And after the laser beam is irradiated, when the temperature of the first object rises to a predetermined temperature, rotating the first and second pressurizing means.
22. The method of claim 19,

    Irradiating a laser beam to a contact portion of the first object and the second object, wherein the laser beam causes multiple reflections on the first object and the second object.

Images