KR20120064800A - Jig for welding of electrode of battery, apparatus and method for welding - Google Patents
Jig for welding of electrode of battery, apparatus and method for welding Download PDFInfo
- Publication number
- KR20120064800A KR20120064800A KR1020100126000A KR20100126000A KR20120064800A KR 20120064800 A KR20120064800 A KR 20120064800A KR 1020100126000 A KR1020100126000 A KR 1020100126000A KR 20100126000 A KR20100126000 A KR 20100126000A KR 20120064800 A KR20120064800 A KR 20120064800A
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- welding
- pressing means
- battery electrode
- jig
- electrode
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/02—Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
- B23K26/035—Aligning the laser beam
- B23K26/037—Aligning the laser beam by pressing on the workpiece, e.g. pressing roller foot
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/36—Electric or electronic devices
- B23K2101/38—Conductors
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- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- Connection Of Batteries Or Terminals (AREA)
- Laser Beam Processing (AREA)
Abstract
A battery electrode welding jig, which has a specified width and is located on one side of a welding object, the contact portion with the welding object has an embossed shape and a first pressing means having a specified width, and is located on the other side of the welding object and is in contact with the welding object. The contact portion includes a pair of second pressing means having an embossed form, the pair of second pressing means is a jig for welding the battery electrode and the welding device are disposed spaced apart from each other by a distance corresponding to the width of the first pressing means and Give a way.
Description
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
Meanwhile, each of the
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
To this end, welding is performed while the
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
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
Referring to FIG. 8, a general electrode welding jig includes a
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
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 portion, while the second pressurizing apparatus is pressed from the upper side to the lower side of both sides of the welded portion 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
The first
The shape of the welded portion of the
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
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
In one embodiment of the present invention, the upper center portion of the first
The
10 is a view for explaining the principle of pressing the jig shown in FIG.
The first and second
Therefore, the
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
While the electrode leads 18 and 19 are disposed on the
The object, that is, the force (F + F) applied from the upper side of the electrode leads 18 and 19 and the
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
In this case, the first
The operator may not only check whether the object is welded by the
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
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
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
The first and second
Using the
In this state, the laser beam condensed by the
When the temperature of the contact portion of the object rises to the preset temperature by the laser beam, the
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
The
Each of the reflecting
The
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
The
Furthermore, when the
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
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
Subsequently, the
In addition, the
The
The laser beam irradiated to the contact site dissolves aluminum and diffuses it to the copper side while causing multiple reflections between the
As a result, the
In addition, when the laser beam is irradiated and the temperature of the object rises to a predetermined temperature, when the first and second
On the other hand, in a preferred embodiment of the present invention, the head of the
Thus, those skilled in the art will appreciate that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics 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 defined by the appended claims rather than the detailed description and all changes or modifications derived from the meaning and scope of the claims and their equivalents are to be construed as being included within the scope of the present invention do.
210, 220, 230: Pressing means
212: home
214: light sensor
300: welding device
310: control unit
320: light source
330: beam irradiator
340: motor
350: optical system
360: pressurization part
362, 364: Pressing means
Claims (22)
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.
The first pressing means is a jig for welding the battery electrode of the contact portion with the object embossed form.
The first pressing means is a jig for welding a battery electrode, the contact portion with the object is flat.
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.
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.
The first pressing means further comprises a light sensor formed on the bottom of the groove jig for welding the battery electrode.
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.
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.
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.
And the first object and the second object have a bonded shape substantially Y-shaped.
And the first object has an angularly curved reflecting portion designated at an end opposite to the contact portion at a terminal thereof.
And the second object has an angled reflecting portion specified at an end opposite to the reflecting portion of the first object.
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.
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 predetermined temperature by the laser beam emitted from the beam irradiator.
And the first object and the second object have a bonded shape substantially Y-shaped.
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.
And the first object is at least one electrode tab and the second object is an electrode lead.
The first object is at least one electrode lead and the second object is a busbar welding device for a battery electrode,
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.
Before the laser beam is emitted, 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. Welding method of a battery electrode further comprising.
And after the laser beam is irradiated, when the temperature of the first object rises to a predetermined temperature, rotating the first and second pressing means in a rotational manner.
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.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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KR1020100126000A KR20120064800A (en) | 2010-12-10 | 2010-12-10 | Jig for welding of electrode of battery, apparatus and method for welding |
PCT/KR2011/004195 WO2012077878A1 (en) | 2010-12-10 | 2011-06-08 | Jig for welding battery electrode, welding apparatus, and welding method |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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KR1020100126000A KR20120064800A (en) | 2010-12-10 | 2010-12-10 | Jig for welding of electrode of battery, apparatus and method for welding |
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KR1020120001028A Division KR20120065279A (en) | 2012-01-04 | 2012-01-04 | Apparatus and method for welding of battery electrode |
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KR20120064800A true KR20120064800A (en) | 2012-06-20 |
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KR1020100126000A KR20120064800A (en) | 2010-12-10 | 2010-12-10 | Jig for welding of electrode of battery, apparatus and method for welding |
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KR (1) | KR20120064800A (en) |
WO (1) | WO2012077878A1 (en) |
Cited By (3)
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US11302999B2 (en) | 2018-04-19 | 2022-04-12 | Lg Energy Solution, Ltd. | Unit module including busbar frame structure which can facilitate welding, and battery module including same |
US11588211B2 (en) | 2018-06-22 | 2023-02-21 | Lg Energy Solution, Ltd. | Automatic pressure jig device for bringing electrode lead into close contact with busbar, and battery module manufacturing system comprising same |
US11623308B2 (en) | 2018-06-29 | 2023-04-11 | Lg Energy Solution, Ltd. | Auto-pressing jig apparatus for pressing electrode lead to busbar |
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CN106078063B (en) * | 2016-08-25 | 2018-05-15 | 贵阳铝镁设计研究院有限公司 | For electrolytic cell cathode steel bar and the welding tool setup of explosion block |
KR102266473B1 (en) * | 2018-02-12 | 2021-06-16 | 주식회사 엘지에너지솔루션 | Spot welding Jig for electrode lead |
CN115673627B (en) * | 2023-01-03 | 2023-03-28 | 佛山市飞帝浦电器有限公司 | Spot welding equipment with protective effect |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
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JP4066433B2 (en) * | 2004-02-24 | 2008-03-26 | 独立行政法人国立高等専門学校機構 | Method and apparatus for joining dissimilar materials by laser irradiation |
JP2006289386A (en) * | 2005-04-06 | 2006-10-26 | Nissan Motor Co Ltd | Method and device for joining different kinds of metal using high energy beam and the joined member |
JP2006289437A (en) * | 2005-04-11 | 2006-10-26 | Nissan Motor Co Ltd | Method and device for joining different kinds of metal using high energy beam |
JP5223272B2 (en) * | 2007-09-04 | 2013-06-26 | 日産自動車株式会社 | Method of welding metal separator for fuel cell and welding apparatus for metal separator for fuel cell |
-
2010
- 2010-12-10 KR KR1020100126000A patent/KR20120064800A/en not_active Application Discontinuation
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2011
- 2011-06-08 WO PCT/KR2011/004195 patent/WO2012077878A1/en active Application Filing
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11302999B2 (en) | 2018-04-19 | 2022-04-12 | Lg Energy Solution, Ltd. | Unit module including busbar frame structure which can facilitate welding, and battery module including same |
US11588211B2 (en) | 2018-06-22 | 2023-02-21 | Lg Energy Solution, Ltd. | Automatic pressure jig device for bringing electrode lead into close contact with busbar, and battery module manufacturing system comprising same |
US11623308B2 (en) | 2018-06-29 | 2023-04-11 | Lg Energy Solution, Ltd. | Auto-pressing jig apparatus for pressing electrode lead to busbar |
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WO2012077878A1 (en) | 2012-06-14 |
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