KR101053210B1 - Welding jig for manufacturing battery pack - Google Patents

Abstract

The present invention is a jig used when welding the connection member to the electrode terminal of the battery in the manufacture of a battery pack consisting of cylindrical cells, (a) a series of semi-cylindrical inner surface structure corresponding to the outer surface of the cylindrical battery is formed An upper mold and a lower mold, one side of which is rotatably interconnected; (b) a pair of connecting member fixing members rotatably connected to one side of the upper or lower mold, and formed in a frame shape in which the connecting member seating members may be mounted; And (c) a mounting groove having a shape corresponding to the shape of the connection member on the inner surface for temporarily mounting the connection members for welding to the electrode terminals of the battery, and for welding punched in a position corresponding to the electrode terminal of the battery. It provides a jig including a through groove and comprising a connection member seating member fixed to a frame of the connection member fixing member in a state capable of mounting and detaching as necessary.

Description

Welding Jig for Manufacturing of Battery Packs {Welding Jig for Preparation of Battery Pack}

The present invention relates to a welding jig for manufacturing a battery pack, and more particularly, a jig used when welding a connection member to electrode terminals of batteries in manufacturing a battery pack consisting of cylindrical batteries, A pair of connecting member fixing members formed of a frame shape in which upper and lower molds having a series of semi-cylindrical inner structures corresponding to the outer surface are formed, a frame on which the connecting member seating members can be mounted, and a mounting groove and a through groove. It is related with the jig comprised including the connection member mounting member fixed to the frame of the connection member fixing member in the state which can be attached and detached.

As technology development and demand for mobile devices increase, the demand for secondary batteries as energy sources is rapidly increasing.

The secondary battery may be used in the form of a single battery cell, or in the form of a battery module in which a plurality of unit cells are electrically connected, depending on the type of external device in which the secondary battery is used. For example, a small device such as a mobile phone can operate for a predetermined time with the output and capacity of one battery cell, while a medium-sized device such as a laptop computer, a portable DVD, a small PC, an electric vehicle, a hybrid electric vehicle, etc. Or large devices require the use of battery modules due to power and capacity issues.

The battery module is manufactured by connecting a protection circuit or the like to a battery pack in which a plurality of unit cells are arranged in series and / or in parallel. In the case of using a square or pouch type battery as a unit cell, the wide surfaces thereof may be stacked to face each other, and then the electrode terminals may be easily connected by connecting members such as bus bars. Therefore, in the case of manufacturing a three-dimensional battery module having a hexahedral structure, a square or pouch type battery is advantageous as a unit cell.

On the other hand, the cylindrical battery generally has a larger capacitance than the square and pouch cells, but due to the external characteristics of the cylindrical battery is not easy to arrange in a laminated structure. However, when the shape of the battery module has a linear or plate-like structure as a whole, there is an advantage in structure than the square or pouch type.

Therefore, in the case of a notebook computer, a portable DVD, a small PC, etc., a battery pack in which a plurality of cylindrical batteries are connected in parallel and / or in series is used in the manufacture of a battery module. As such a battery pack, the linear structure of 2P (parallel) -3S (serial), the plate-shaped structure of 2P-3S, the linear structure of 2P-4S, the plate-shaped structure of 2P-4S, etc. are used, for example.

The parallel connection structure is achieved by arranging two or more cylindrical cells adjacent in their lateral directions with the electrode terminals oriented in the same direction, and welding them to the connecting member. Such parallel cylindrical cells are also referred to as "banks".

In series connection structure, two or more cylindrical cells are arranged in a lateral direction while two or more cylindrical cells are arranged in a long manner so that electrode terminals of opposite polarities are continuous or the electrode terminals are arranged in opposite directions. Arranged adjacent to each other, the welding is performed by the connecting member. In the electrical connection of such cylindrical batteries, spot welding is generally performed using a thin plate-like connecting member such as a nickel plate.

However, the welding of the plate-shaped connecting member to the electrode terminals of the plurality of cylindrical batteries requires a lot of time as a very complicated and sophisticated work process due to the structural characteristics of the cylindrical batteries.

1 and 2 are diagrams schematically illustrating a process of manufacturing a battery pack having a 2P-3S linear structure using a connection member.

Referring to FIG. 1, first, the cells 20 and 21 are fixed to the jig 10, the connection member 30 is positioned on a terminal of the battery 20, and then spot welding is performed by the welding tip 40. These batteries 20 and 21 are connected in parallel to form a bank. Then, as in FIG. 2, spot welding the other pair of parallel cells 22, 23, wherein the first parallel cell pair 20, 21 and the second parallel cell pair 22, 23 are connected in series. In order to do this, they must be positioned at 90 degrees, and then the connecting member 30 must also be bent at 90 degrees and welded. Therefore, in order to perform such a task requires a special structure jig and very skilled skills and takes a lot of work time.

In addition, every time the structure of the battery pack is changed, a new structure corresponding to the connection member is required. In general, a jig has a fixed portion for fixing the connection member and a seating portion on which the connection member is mounted. Although not significantly different, the whole jig is manufactured according to the structure of the battery pack to be manufactured, or the existing jig is disassembled and modified to manufacture a battery pack using a connection member having a new structure. This is a very inefficient problem in terms of management of the jig and cost of battery pack manufacturing.

Therefore, there is a high need for a technique capable of fundamentally solving such problems.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-described problems of the prior art and the technical problems required from the past.

That is, an object of the present invention is to provide a welding jig having a new structure that can easily perform welding of a connection member to an electrode terminal of a battery in manufacturing a battery pack using a cylindrical battery as a unit cell. .

Still another object of the present invention is to provide a welding jig that can use a common connection member used to manufacture a battery pack having various structures.

Welding jig according to the present invention for achieving this object is a jig used when welding the connection member to the electrode terminal of the battery in manufacturing a battery pack consisting of cylindrical batteries,

(A) the upper mold and the lower mold is formed with a series of semi-cylindrical inner structure corresponding to the outer surface of the cylindrical battery and one side rotatably interconnected;

(b) a pair of fixing members rotatably connected to one side of the upper or lower mold, and formed in a frame shape in which a connection member seating member may be mounted; And

(c) a mounting groove having a shape corresponding to the shape of the connection member formed on the inner surface of the connection member for temporarily mounting the connection members for welding the electrode terminals of the battery, and a penetration through the hole drilled at a position corresponding to the electrode terminal of the battery. A connection member seating member ('sitting member') including a groove and fixed to the frame of the fixing member in a state capable of mounting and detaching if necessary;

It is configured to include.

Therefore, in a state in which a plurality of cylindrical batteries are arranged on the inner surface of the upper mold and the lower mold, the mounting member having the connection member positioned in the mounting groove is mounted on the pair of fixing members, and then coupled to the upper and lower molds, and then the mounting member Since the welding can be performed by inserting a welding tip through the through groove of, the welding operation can be easily performed by a simple device in a short time.

In addition, even when the structure of the battery pack to be changed to change the connection member, various types of connection members can be replaced by simply replacing the mounting member corresponding to the shape of the connection member without disassembling or replacing the entire jig. The manufacturing cost can be greatly reduced.

On the other hand, when the jig is repeatedly used, the upper mold, the lower mold and a pair of fixing members frequently repeat the coupling and disassembly, it is preferable that the jig is formed in such a structure easy to combine and disassemble. To this end, for example, the upper mold is interconnected by a mechanical fastening structure to be rotatable with respect to the lower mold, and the fixing member may be a structure connected to each other by a mechanical fastening structure to be rotatable with respect to the lower mold.

In one preferred embodiment, the coupling portion of the seating member and the fixing member may be configured to include a coupling portion that is easy to mount and detach as necessary.

When the structure of the battery pack to be manufactured is changed and the connection member is replaced, the mounting member mounted on the fixing member is repeatedly mounted and detached to replace the connection member, so that it is easy to mutually mount and detach the fixing member. It is preferable to be formed in a structure, each binding site may include a coupling portion that is easy to mount and detach.

Preferably, the fixing member has a rectangular frame structure, and the seating member is formed with a step that can be pressurized to correspond to the rectangular frame, thereby fixing the stepped portion formed on the rectangular seating member. By inserting the inside of the rectangular frame structure, the mounting member can be easily achieved by an appropriate pressing force.

On the contrary, in the case of detaching the mounting member mounted on the fixing member, the fixing member is immovably fixed and a force is applied to the mounting member in the direction of the step where the step is formed, thereby easily detaching the mounting member.

In some cases, the coupling portion may be made of a magnetic material to facilitate mounting and detachment as necessary, or may be a structure in which a magnetic force member providing a coupling force to the coupling portion is added. That is, the coupling portion itself of the seating member and the fixing member may be formed of a magnetic material, and the magnetic coupling member may be additionally attached to each coupling portion by adhesion, mechanical fastening, or the like, to facilitate mounting and detachment.

According to the present invention, a jig according to the present invention has a cylindrical battery and a connection member arranged therein so that respective components consisting of an upper mold, a lower mold, a pair of fixing members and a seating member are joined to each other to weld the cylindrical battery and the connecting member. To be able to perform Therefore, when current flows in the respective components of the jig contacting the cylindrical battery and the connecting member during welding, the cylindrical battery may be damaged or affect the safety of the work. Therefore, the material of the jig is made of an electrically insulating plastic material. It is preferable that it consists of.

The rotatable mechanical fastening structure of the upper mold and the lower mold and the rotatable mechanical fastening structure of the fixing member and the lower mold may be achieved by various structures, and preferably, may be formed of a hinge structure or a hinge structure.

For example, the upper formwork is connected so that one end thereof is pivotally rotated by a hinge structure or hinge structure with respect to the lower formwork, and the fixing member has its lower or upper end hinged or hinged structure with respect to the lower formwork. It can be connected to be coupled while pivoting by.

The shape of the mounting groove is not particularly limited as long as it is a shape capable of stably mounting the connection member. Preferably, the mounting groove may be a recessed groove or a slit as a shape corresponding to the shape of the connection member.

For example, when the connection member has a flat plate structure, the fixing groove may have a shape of an indentation groove corresponding to the thickness of the plate-shaped connection member. When the connecting member is a predetermined three-dimensional structure or a flat plate structure, a part of the connecting member is bent at a predetermined angle, the mounting groove may be in the form of a kind of slit so that a part of the connecting member protrudes to the other side of the seating member.

Since the structure of the mounting groove is determined according to the shape of the connection member, it is preferable that a plurality of structures corresponding to the connection members overlap so that various kinds of connection members can be selectively mounted as necessary. Can be imprinted. This can achieve the common use of the welding operation to be able to manufacture a battery pack of various structures by a few kinds of connecting members.

On the other hand, the connection member is not particularly limited as long as it is a material that is easy to electrically connect the electrode terminals of the cylindrical batteries, respectively, preferably may be made of a metal plate, for example, nickel having excellent electrical conductivity or copper to copper Plated thin plate-like nickel plates may be more preferably used.

The mounting groove may be formed on the inner surface of the connection member seating portion overlapping with the structure corresponding to the shape of the connection member as follows to achieve the common use of the welding operation. Such a connection member may include, for example, a first metal plate on which a connection portion for connection with a protection circuit protrudes on an outer surface of the plate body, and a slit is formed on the plate body to facilitate welding with an electrode terminal; The connection part for connection with the protection circuit protrudes on the left or right outer surface of the plate body, and a slit is formed in the plate body to facilitate welding with the electrode terminals, and the upper and / or lower ends of the central part of the plate body are formed. A second metal plate having a bending guide groove formed on a surface thereof; And a connection portion for connection with the protection circuit protrudes on the outer surface near the center of the plate body, and a slit is formed in the plate body to facilitate welding with the electrode terminal, and the upper and / or lower ends of the center of the plate body. A third metal plate having a bending guide groove formed on a surface thereof; It may include.

They can be selected according to the configuration of the desired battery pack. The first connection member is used to connect the unit cells only in the side direction, and the second connection member and / or A third connecting member can be used.

By the combination of the three kinds of metal plates as described above, it is possible to manufacture all kinds of battery packs making a parallel and series connection based on the cylindrical unit cell. As a result, even if the structure of the battery pack is changed, it is possible to select the combination in the above combination without the need to manufacture a metal plate separately, it becomes possible to share the parts. For example, a battery pack having a linear structure of 2P-3S, a 2P-3S plate structure, a 2P-4S linear structure, a 2P-4S plate structure, a 1P-3S linear structure, or a 1P-3S plate structure can be manufactured.

In connecting the unit cells in the lateral and longitudinal arrangements, the reason why the second metal plate and the third metal plate of different structures are selectively or used together is as described later in the drawings. Is required to bend in opposite directions when connecting 3S in series, and it is desirable to install a metal plate so that the connection part is located on one side of the battery pack to minimize the connection length when connecting the protection circuit to the battery pack. Because.

Therefore, the connection portion is not particularly limited as long as the metal plates are vertically bent downward so as to be in close contact with the side surface of the unit cell in the state of spot welding the electrode terminals of the unit cell or the bank.

When the battery pack is manufactured by arranging the unit cells or banks in the lateral direction, the connecting portions may be exposed at 30 to 150 degrees from the plate body of the metal plate so that the connecting portions of the metal plates may be exposed on the upper or lower surface of the battery pack. It is preferable to form at an angle. If the shape angle of the connection portion is too small or large, some connection portions are located inside the outer circumferential surface of the unit cell, and thus the connection of the protection circuit is not easy.

In a more preferred example, the connecting portion of the first metal plate and the second metal plate is formed at an angle of 30 to 60 degrees with respect to the end of the plate body, and the connecting portion of the third metal plate is 120 to the relative end of the plate body. It is formed at an angle of 150 degrees. Particularly preferably, the connecting portion of the first metal plate and the second metal plate is formed at the same angle (eg, 45 degrees), and the connecting portion of the third metal plate is an angle symmetric to the angle (eg, 135 degrees). It is formed.

The connection of the metal plates to the unit cell or bank is achieved by spot welding. As described above, slits are formed at positions where the electrode terminals of the unit cell or the bank contact each other, thereby improving the weldability of spot welding.

In the jig according to the present invention, the mounting groove of the fixing member is preferably configured in such a way that the structures of these plates are superimposed so that the three kinds of metal plates can be selectively mounted as necessary. For example, a mounting groove may include a main groove having a width corresponding to the plate body of the metal plates, and a plurality of side grooves extending from the main groove at a position corresponding to respective connections of the metal plates. (side grooves). The side grooves form some overlapping structure due to the change in position of the connections of the metal plate.

The through hole for welding is drilled on the main groove at a position corresponding to the slit of the metal plate.

In one preferred example, the inner surface of the main groove and / or the side groove may be equipped with a magnetic member to enable the detachment of the metal plate. Such a magnetic force member may be a small permanent magnet, for example.

The present invention also provides a battery pack manufactured using the jig, the battery pack can be used as a power source for home electronic devices, such as portable DVD, small PC, preferably used as a power source for a notebook computer have.

Hereinafter, the present invention will be described in more detail with reference to the drawings, but the scope of the present invention is not limited thereto.

3 is a schematic diagram illustrating a jig according to an exemplary embodiment of the present invention, and FIG. 4 is a schematic diagram illustrating a state in which the jig of FIG. 3 is coupled.

Referring to these drawings, the welding jig 100 includes an upper mold 140 and a lower mold 130 and a connection member (not shown) in which a series of semi-cylindrical inner surface structures 142 corresponding to the outer surface of the cylindrical battery are formed. Fixing the shape of the frame 122 to which the seating member 110, the seating member 110 is coupled and fixed, including a mounting groove (not shown) and a welding through-hole 113 for temporarily mounting (not shown) The member 120 is comprised.

The upper mold 140 and the lower mold 130, one end thereof is fixed by the hinge 150, it is possible to pivot each other.

The fixing member 120 is composed of a frame 122 coupled to the step 112 of the seating member 110 and a coupling portion 121 rotatably coupled to the lower mold 130.

The mounting member 110 includes a mounting groove formed on the inner surface, a welding through groove 113 for welding the contact member and the electrode terminal of the cylindrical battery by inserting a welding tip during spot welding, and a fixing member 120 as necessary. Consists of a step 112 is coupled to the frame 122 of. Since the width of the step 112 is approximately equal to the inner width of the frame 122, the mounting member 110 with respect to the fixing member 120 is pressed by being mounted so that the step 112 is positioned on the frame 122. ) May be combined, and the mounting member 110 may be separated from the fixing member 120 by pressing the mounting member 110 in a direction opposite thereto.

Therefore, after mounting a predetermined number of cylindrical batteries on the semi-cylindrical inner surface structure 142 of the lower mold 130, the upper mold 140 is rotated to cover the upper portion of the lower mold 130, the mounting member 110 After the fixing member 120 is rotated to cover the terminal part of the cylindrical batteries in a state in which the predetermined connecting members are mounted in the mounting groove, a welding tip (not shown) is inserted through the welding through groove 113 to predetermined welding. You can do it.

As a result, it is possible to achieve the electrical connection of the cylindrical batteries by the connecting member without employing the jig 10 and the corresponding welding method as in FIGS. In addition, when it is necessary to replace the connection member (not shown) welded to the electrode terminals of the cylindrical batteries due to the change in the structure of the battery pack, it is fixed without replacing the entire jig 100 or changing the structure of the jig 100 By replacing only the mounting member 110 mounted on the member 120, the connection member can be easily replaced.

FIG. 5 is a schematic diagram illustrating the fixing member and the seating member of FIG. 3 in opposite directions, and FIG. 6 is a schematic view of the inner surface of the seating member.

Referring to these drawings, a plurality of structures corresponding to the connection members are overlapped on the inner surface of the seating member 110 so that various kinds of connection members 200, 300, and 400 may be selectively mounted as needed. The mounting groove 111 is imprinted in the shape, and the welding through grooves are also drilled.

The various kinds of connection members 200, 300, and 400 are plate-shaped nickel plates, which are selectively mounted in the mounting groove 111 according to the configuration of the desired battery pack.

Since only the use of the plate-shaped nickel plate is illustrated as the connecting members 200, 300, and 400, the mounting groove 111 is shown in the form of a recessed groove in the drawing of FIG. 6, but as described above, the connecting member has a three-dimensional structure. Or when a part of it is bent vertically as a flat plate structure, the mounting groove 111 is a slit or indented shape so that a part of the connection member may protrude to the other side during the mounting process to the seating member 110. The groove may further include a slit.

7 to 9 are schematic views showing the first metal plate, the second metal plate, and the third metal plate that can be mounted in the mounting groove for the connecting member of FIG. 6.

First, referring to FIG. 7, the first metal plate 200 may include connection parts 220 protruding from one end of the plate body 210 and slits 230 and 231 formed near both ends of the body 210. Consists of. The slits 230 and 231 are formed at positions corresponding to the electrode terminals of two unit cells (not shown) constituting the bank, thereby improving weldability of spot welding. The connection part 220 protrudes from the main body 210 at an angle of about 45 degrees, and a pair of bending guide grooves 221 and 222 are formed in the middle. The position of the connection part 220 with respect to the bank may vary depending on how the first metal plate 200 is welded to the electrode terminal of the bank.

Next, referring to FIG. 8, in the second metal plate 300, the connection part 320 protrudes from one end of the plate body 310 having a length about twice that of the first metal plate. A pair of bending guide grooves 321 and 322 are formed in the center portion. Slits 330 and 333 are formed near both ends of the main body 310, and slits 331 and 332 are formed near the center, and a pair of bending guide grooves are formed at the upper and lower ends of the central part of the main body 310. 311 and 312 are formed to be divided into a main body left part 310a and a main body right part 310b with respect to the bending guide grooves 311 and 312.

Therefore, the bank (a) (not shown) connected to the main body left part 310a and the bank b connected to the main body right part 310b are bent based on the bending guide grooves 311 and 312. For example, bending the bank b 180 degrees with respect to the bank a causes them to be arranged in the longitudinal direction. In addition, since the electrode terminals of the bank (a) and the bank (b) are configured to have opposite polarities to each other, the second metal plate 300 is connected with the parallel type connection of the unit cells in each bank (a, b), The serial connection between the banks (a, b) connected to the left side and the right side (310a, 310b) of the main body, respectively.

In the third metal plate 400 of FIG. 9, the connecting portion 420 is formed in the main body left portion 410a near the center of the plate main body 410, that is, in the vicinity of the bending guide grooves 411 and 412. The same structure as the second metal plate 300 of FIG. 8 is inclined at an angle symmetrical with respect to the connecting portion 320 of the plate 300.

Those skilled in the art to which the present invention pertains will be able to perform various applications and modifications within the scope of the present invention based on the above contents.

As described above, the jig according to the present invention is composed of the upper and lower molds and the fixing member and the seating member of a specific structure and coupling relationship, when manufacturing a battery pack of various structures can be easily manufactured according to the shape of the connection member have.

This greatly shortens the battery pack manufacturing time, and when manufacturing a battery pack of a new design, it is not necessary to change only the seating member and to manufacture the whole jig again. As a result, the manufacturing cost of the battery pack can be lowered.

1 and 2 are schematic diagrams of a process of connecting a plurality of cells using a nickel plate according to the prior art;

3 is an exploded schematic view of a jig according to one embodiment of the present invention;

4 is a schematic diagram showing a state in which the jig of FIG. 3 is coupled;

FIG. 5 is a schematic diagram showing the fixing member and the seating member of FIG. 3 in opposite directions, and FIG. 6 is a schematic view of the inner surface of the seating member;

7 to 9 are schematic views illustrating a first metal plate, a second metal plate, and a third metal plate mounted in the mounting groove for the connecting member of FIG. 6.

Claims (19)

In manufacturing a battery pack consisting of cylindrical batteries as a jig used when welding the connection member to the electrode terminal of the batteries, (A) the upper mold and the lower mold is formed with a series of semi-cylindrical inner structure corresponding to the outer surface of the cylindrical battery and one side rotatably interconnected; (b) a pair of fixing members rotatably connected to one side of the upper or lower mold, and formed in a frame shape in which a connection member seating member may be mounted; And (c) a mounting groove having a shape corresponding to the shape of the connection member formed on the inner surface of the connection member for temporarily mounting the connection members for welding the electrode terminals of the battery, and a penetration through the hole drilled at a position corresponding to the electrode terminal of the battery. A connection member seating member ('sitting member') including a groove and fixed to the frame of the fixing member in a state in which mounting and detachment are possible; Jig that is configured to include. The jig according to claim 1, wherein the upper mold is interconnected by a mechanical fastening structure to be rotatable with respect to the lower mold, and the fixing member is also interconnected by a mechanical fastening structure to be rotatable with respect to the lower mold. . The jig according to claim 1, wherein the coupling portion of the seating member and the fixing member includes a coupling portion that is easy to mount and detach. The jig according to claim 3, wherein the fixing member has a rectangular frame structure, and the seating member has a step that is pressurizable to correspond to the rectangular frame. The jig according to claim 3, wherein the coupling part is made of a magnetic material to facilitate mounting and detachment, or a magnetic force member is provided to provide a coupling force to the coupling part. The jig according to claim 1, wherein the jig is made of an electrically insulating plastic material. The jig according to claim 2, wherein the rotatable connection consists of a hinge structure or a hinge structure. The jig according to claim 1, wherein the mounting groove has a shape corresponding to the shape of the connecting member and is formed of an indentation groove or a slit. The jig according to claim 1, wherein the mounting groove is stamped in a shape in which a plurality of structures corresponding to the connecting members overlap, so that various kinds of connecting members can be selectively mounted. The jig according to claim 1, wherein the connection member is made of a metal plate. The method of claim 1, wherein the mounting groove, A first metal plate on which a connection portion for connection with a protection circuit protrudes on an outer surface of the plate body, and a slit is formed in the plate body to facilitate welding with the electrode terminal; The connection part for connection with the protection circuit protrudes on the left or right outer surface of the plate body, and a slit is formed in the plate body to facilitate welding with the electrode terminals, and the upper and / or lower ends of the central part of the plate body are formed. A second metal plate having a bending guide groove formed on a surface thereof; And The connection part for connection with the protection circuit protrudes on the outer surface near the center of the plate main body, and a slit is formed in the plate main body to facilitate welding with the electrode terminal, and the upper and / or lower end of the center of the plate main body. A third metal plate having a bending guide groove formed therein; Jig, characterized in that the structure corresponding to the imprinted in the overlapping shape. 12. The jig according to claim 11, wherein the connection part has a length that can be bent vertically downward so as to be in close contact with the side of the unit cell in the state where each metal plate is spot welded to the electrode terminals of the unit cell or the bank. . The method of claim 11, wherein the connecting portion of the first metal plate and the second metal plate is formed at an angle of 30 to 60 degrees relative to the end of the plate body, the connecting portion of the third metal plate relative to the end of the plate body Jig, characterized in that formed at an angle of 120 to 150 degrees. The jig according to claim 13, wherein the connecting portion of the first metal plate and the second metal plate is formed at 45 degrees, and the connecting portion of the third metal plate is formed at 135 degrees. 12. The apparatus of claim 11, wherein the mounting groove includes a main groove having a width corresponding to the plate body of the metal plates and a plurality of grooves extending from the main groove at positions corresponding to respective connections of the metal plates. Jig characterized by consisting of side grooves The jig according to claim 15, wherein the welding through groove is drilled on the main groove at a position corresponding to the slit of the metal plate. The jig according to claim 15, wherein a magnetic member is mounted on an inner surface of the main groove and / or the side groove so that the metal plate can be detached. A battery pack manufactured using the jig according to any one of claims 1 to 17. 19. The battery pack as claimed in claim 18, wherein the battery pack is used as a power source for a notebook computer.

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