KR101138644B1 - Electrode Terminal Welding Device and Welding Process Using the Same - Google Patents

Abstract

The present invention is a device for welding the plate-shaped electrode terminals of the battery cell or the battery module to each other or the welding of the plate-shaped electrode terminal and the external circuit, while pressing the welding rod introduced into the lower surface of the welding plan portion, and the upper surface of the welding plan portion It includes a welding wheel that moves, and provides a welding device having a structure for performing linear resistance welding while pressing the upper surface of the welding wheel while supporting the lower surface of the welding plan portion with the welding rod.

Description

Electrode Terminal Welding Device and Welding Process Using the Same}

The present invention relates to an electrode terminal welding apparatus, and more particularly, to a device for welding the plate-shaped electrode terminals of the battery cell or battery module to each other or the welding of the plate-shaped electrode terminal and the external circuit, to the lower surface of the welding scheduled portion. A welding rod which is introduced and a welding wheel that moves while pressing the upper surface of the welding scheduled portion, and performs linear resistance welding while pressing the upper surface of the welding wheel while supporting the lower surface of the planned welding portion with the welding rod. It relates to a welding device of the structure.

BACKGROUND ART [0002] In recent years, rechargeable secondary batteries have been widely used as energy sources for wireless mobile devices. Secondary batteries are also attracting attention as a power source for electric vehicles (EVs) and hybrid electric vehicles (HEVs), which are proposed as a way to solve air pollution in conventional gasoline and diesel vehicles that use fossil fuels. .

One or two or four battery cells are used for small mobile devices, whereas medium and large battery modules, which are electrically connected to a plurality of battery cells, are used in medium and large devices such as automobiles due to the necessity of high output capacity.

Since the medium-large battery module is preferably manufactured in a small size and weight, the rectangular battery, the pouch-type battery, etc., which can be charged with high integration and have a small weight to capacity, are mainly used as battery cells of the medium-large battery module. In particular, a pouch-type battery using an aluminum laminate sheet or the like as an exterior member has attracted much attention in recent years due to the advantages of low weight and low manufacturing cost.

However, since the exterior member itself is not excellent in mechanical rigidity, in order to manufacture a battery module having a stable structure, battery cells (unit cells) are generally mounted in a pack case such as a cartridge to manufacture a battery module. . However, since a mounting space is generally limited to a device or a vehicle on which a medium / large battery module is mounted, when the size of the battery module is increased due to the use of a pack case such as a cartridge, there is a problem of low space utilization. In addition, the low mechanical stiffness of the battery cell results in repeated expansion and contraction of the battery cell during charging and discharging, thereby causing a case where the heat fusion sites are separated.

Therefore, in order to solve this problem, the present applicant is a Korean Patent Application No. 2006-45444, the battery module including the plate-shaped battery cells, the electrode terminals are formed on the top and bottom, respectively, the electrode terminals are mutually in series Two or more battery cells connected to each other and bent at the connection part of the electrode terminals to form a stacked structure, and a pair of high strength cells which are mutually coupled to cover the entire outer surface of the battery cell stack except for the electrode terminal part. A battery module composed of a cover has been presented.

According to the above technique, in the process of assembling the battery module, the electrode terminals are coupled to each other by ultrasonic welding while the two pouch-type battery cells are arranged in series in the longitudinal direction such that the electrode terminals thereof are continuously adjacent to each other. Then, two battery cells combined with electrode terminals are folded so as to face each other to form a battery cell stack, and then a unit cover is manufactured to manufacture a unit battery module, and electrode terminals are connected to produce a medium-large battery module.

As described above, however, the process of connecting the electrode terminals between the unit battery modules is generally performed by ultrasonic welding, and since the positive electrode terminal and the negative electrode terminal of the battery module are made of different materials, they are mutually welded. When the welding coupling force between the terminals tends to fall, the medium-large battery module manufactured as described above has a problem in that a short circuit may occur due to separation of the welding part when an external force such as vibration and shock is applied.

In addition, since the position of each welding portion formed in the battery module stack structure is close in the process of stacking the battery modules and welding the respective electrode terminals, a precise and robust welding device is required to weld the electrode terminals. That is, a malfunction of the welding device or a welding process by the welding device having a large error movement causes a short circuit of the welding site.

Therefore, there is a high need for a welding apparatus and a welding method for improving safety while improving weldability.

The present invention aims to solve the above-mentioned problems of the prior art and technical problems that have been requested from the past.

Specifically, an object of the present invention is to provide an electrode terminal welding apparatus and a welding method which can improve the weldability in connecting the electrode terminals of the battery cells or battery modules, and prevent the short from occurring in the welding process, thereby improving safety. will be.

Still another object of the present invention is to provide a medium-large battery module having improved safety by connecting battery cells or battery modules by the welding device and method.

The welding device according to the present invention for achieving the above object is a device for welding the plate-shaped electrode terminals of the battery cell or the battery module to each other or the welding of the plate-shaped electrode terminal and the external circuit, which is introduced to the bottom surface of the welding scheduled portion. And a welding wheel that moves while pressing the upper surface of the welding scheduled portion, and the linear resistance welding is performed while pressing the upper surface of the welding wheel while supporting the lower surface of the planned welding portion with the welding rod. Consists of.

That is, in the welding apparatus of such a structure, the welding rod supports the lower end of the welding scheduled portion, and the welding wheel performs linear resistance welding while pressing the welding scheduled portion on the welding rod, so that the weldability of the electrode terminals is higher than that of the conventional spot welding or ultrasonic welding. It can be further improved.

Therefore, the welding apparatus according to the present invention compensates for the disadvantage that the weldability decreases when the materials of the positive and negative terminals of the battery cell are different when the battery module is manufactured by connecting the terminals of the battery cells in series. The bonding force can be further improved, and welding can be performed more easily in the correct position.

For reference, the linear resistance welding (Seam Welding) refers to a welding method to form a linear welding site as a whole by continuously performing spot welding by rotating under pressure while supplying a welding current using a disk electrode.

The battery cell may have a plate-like structure having a thin thickness and a relatively wide width and length so as to minimize the overall size when the battery cell is charged for the configuration of the battery module. For example, a plate-shaped battery cell having a structure in which an electrode assembly is embedded in a battery case of a laminate sheet including a resin layer and a metal layer, and electrode terminals protrude from both upper and lower ends thereof, and specifically, a pouch of an aluminum laminate sheet It may be made of a structure in which the electrode assembly is built in the mold case.

The battery module is a battery module including plate-shaped battery cells, the electrode terminals are formed on the top and bottom, respectively, for example, the electrode terminals are interconnected in series, the connection of the electrode terminals are bent and stacked Two or more battery cells forming a structure; And a pair of high-strength cell covers coupled to surround the outer surfaces of the battery cells except for the electrode terminal portion. Specific examples of such a battery module include the module of the present applicant, Korean Patent Application No. 2006-0045444 as described above, which is incorporated by reference in the context of the present invention.

Preferably, the welding plan portion may be a portion in which two battery cells or battery modules are vertically bent so that adjacent plate-shaped electrode terminals overlap each other in a state where the battery cells or battery modules are sequentially stacked. For example, when connecting their electrode terminals to each other in a stacked battery cell or battery module, the protruding electrode terminals of one battery module A are perpendicular to the direction in which the other battery modules B to be connected thereto are stacked. The electrode terminal of the battery module (B) is bent vertically in the direction of the battery module (A), and the electrode terminals of these battery modules (A, B) overlap the vertically bent portions to form a welding plan portion. It may be made of a structure for performing a post-weld.

The welding apparatus according to the present invention, as defined above, is composed of a structure for performing linear resistance welding continuously while pressing the upper surface with a welding wheel while supporting the lower surface of the welding plan portion with a welding rod, the electrode of a large area The terminals can be welded at a time, and even when dissimilar metal welding, that is, welding for connecting the positive terminal and the negative terminal of a battery cell having different materials in series, the coupling force of the electrode terminals can be improved.

In particular, the material of the welding rod and the welding wheel can be appropriately selected corresponding to the material of the electrode terminals in order to improve the bonding force during the welding between dissimilar metals. For example, when a battery cell includes a positive electrode terminal made of aluminum and a negative electrode terminal made of copper, when the positive electrode terminal and the negative electrode terminal are welded to connect a plurality of such battery cells in series, each electrode terminal material is The weldability is generally reduced due to the melting point difference between aluminum and copper. Therefore, a welding wheel made of molybdenum (Mo) or tin (Sn) material having a high self resistance is used for a copper (Cu) electrode terminal having a low resistance value, and a self resistance for an aluminum (Al) electrode terminal having a large resistance value. A welding rod made of this low chromium copper electrode can be used.

That is, when the material of the positive terminal and the negative terminal is different, the welding terminal (welding rod or welding wheel) having low self-resistance is placed on the electrode terminal having high resistance value, and the self-resistance is large on the electrode terminal having low resistance value. When the welding terminal (welding wheel or welding rod) is placed and the electrode terminals are joined by resistance welding, the welding force of the positive electrode terminal and the negative electrode terminal can be melted together to further improve the bonding force.

In one preferred example, the welding rod is provided by a cylinder installed at the rear end so that the welding rod can be introduced from the horizontal (side) direction with respect to the welding scheduled portion to be brought into close contact with the bottom surface of the welding scheduled portion and removed after welding. It may be formed in a structure that moves back and forth in the horizontal direction.

In another preferred example, the welding wheel is perpendicular to the weld scheduled portion such that a welding wheel is introduced into the top surface of the weld scheduled portion for welding to move horizontally while pressing the top surface and to be removed after welding. And it can be installed on the movable member moving back and forth and left and right in the horizontal direction.

In this structure, the moving member is composed of a second block which moves in a horizontal direction with respect to the welding scheduled portion and moves in a vertical direction with the first block, wherein the first block and the second block are connected in an LM block-rail structure. It may be composed of a structure. Thus, the first block can move in the horizontal direction while performing the welding while the welding wheel is in close contact with the welding schedule, and the second block can move the welding wheel in the vertical direction to approach or be spaced apart from the welding schedule. have.

In some cases, it may further include a support member for positioning the plurality of battery cells or battery modules in a stacked state so that two or more welding scheduled portions are positioned in the direction of the welding rod and the welding wheel. The support member may fix the stacked state of the battery cells or battery modules so that at least two welding scheduled portions of the stacked battery cells or battery modules are positioned between the welding rod and the welding wheel.

In this structure, the support member may be configured to be movable in the vertical direction to enable the sequential welding by the welding rod and the welding wheel for a plurality of welding scheduled portion. This structure can move the height of the welding plan portion to be welded in the vertical direction corresponding to the height of the welding wheel, and also has a structure in which the support member is moved in the vertical direction in response to the gap of the welding plan portion. Can be done.

In another example, the support member includes a guide (support guide) for supporting at least both sides of the stacked battery cells or battery modules, so that during welding, the battery is stacked by the forward and backward movement of the welding rod and the horizontal movement of the welding wheel. The cell or battery modules may be fixed in position to maintain an aligned structure.

On the other hand, in order to prevent shorts occurring during welding, an insulating member may be further mounted between the welding scheduled portions. For example, the insulating member may be formed of a frame connecting the insulating partition walls and the insulating partition walls integrally inserted between the welding scheduled portions while the welding scheduled portion is exposed.

Therefore, the insulating members can be safely spaced apart from each other to prevent current from flowing through the welding scheduled portions, and welding scheduled portions may be caused due to malfunction or positional deviation of a part of a welding device such as a supporting member, a moving member, a welding rod, or the like during welding. It is possible to prevent the short from occurring in contact with each other.

The present invention also provides a method for electrically connecting the plate-shaped electrode terminals of the battery cells or battery modules using the welding device,

(a) mounting two or more battery cells or battery modules on the support member such that the welding plan portion is positioned in the direction of the welding rod and the welding wheel;

(b) mounting an insulating member between the welding scheduled portions;

(c) advancing the welding rod to bring it into close contact with the lower end of the uppermost (or lowermost) welding scheduled part;

(d) performing a linear resistance welding by advancing the welding wheel to bring the welding wheel into close contact with the welding plan portion and then moving in the horizontal direction;

(e) reversing the welding wheel; And

(f) repeating the steps (c) to (e) by moving the support member upward (or downward);

It provides a welding method comprising a.

This welding method is excellent in the bonding force of the electrode terminal welding portion of the laminated battery cell or battery module, and can prevent short circuit during the welding process, it is preferably used for the manufacture of high output large-capacity battery module that requires more structural stability. And enable continuous processing by automation.

Therefore, the present invention also provides a high output large-capacity battery module manufactured by the above method.

The medium-large battery module includes a plurality of battery modules having a structure in which two or more battery cells are coupled by a pair of cell covers, and battery cells in the battery modules and the battery cells in the battery module are bent vertically. It may be made of a structure that is electrically connected by linear resistance welding in the superimposed state.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings, but the present invention is not limited by the scope of the present invention.

1 to 4 schematically show a process of manufacturing a battery module stack.

First, referring to FIG. 1, the pouch-type battery cell 100 has a structure in which two electrode leads 110 and 120 protrude from each other to protrude from an upper end and a lower end of the battery cell body 130. Exterior member 140 is composed of two upper and lower units, both side surfaces 140b and the upper and lower portions 140a which are mutually contacting portions with the electrode assembly (not shown) mounted on the receiving portion formed on the inner surface thereof. , The battery 100 is made by attaching 140c.

The exterior member 140 is made of a laminate structure of a resin layer / metal foil layer / resin layer, and is attached to both sides 140b and upper and lower ends 140a and 140c by contact with each other to heat and pressure to bond the resin layer to each other. In some cases, the adhesive may be attached using an adhesive. Both sides 140b are in direct contact with the same resin layer of the upper and lower exterior members 140, thereby enabling uniform sealing by melting. On the other hand, since the electrode leads 110 and 120 protrude from the upper end 140a and the lower end 140c, the sealing properties are improved in consideration of the thickness of the electrode leads 110 and 120 and the heterogeneity with the material of the exterior member 140. Heat-sealed in the state of interposing the film-like sealing member 160 between the electrode leads 110, 120 so as to be able to.

Referring to FIG. 2, two pouch-type battery cells 100a and 100b are vertically bent in an outward direction and one side 121 of the electrode terminals 120 and 121 thereof is vertically inward. Bend. In the battery cell stack 100 ′ in which the electrode terminals 120 and 121 are folded so as to overlap each other, the electrode terminal portions 120 coupled to each other by linear resistance welding are bent in a 'c' shape and are opposed to each other. Opposite electrode terminals 121 are vertically bent in the upper and lower directions, respectively.

3 is a perspective view schematically illustrating a unit battery module. Referring to FIG. 3 together with FIG. 2, a pair of cell covers 200 is mounted outside the overlapped battery cell stack 100 ′ to compensate for weak mechanical characteristics of the battery cell stack 100 ′. Doing. One electrode terminal 120 of the battery cell stack 100 ′ is bent in a 'c' shape while facing each other, and the opposite electrode terminal 121 is an electrode terminal of a battery module stacked on a side surface (not shown). It is bent outward to combine with.

The cell cover 200 is formed of a pair of high-strength metal plate which is coupled to each other to cover the entire outer surface of the battery cell stack 100 ′ except for the electrode terminals 120 and 121. Steps 240 are formed on side surfaces adjacent to the left and right ends of the cell cover 200 to facilitate fixing of the module, and steps 250 are also formed on the top and the bottom thereof. In addition, longitudinal fixing parts 260 are formed at upper and lower ends of the cell cover 200 to facilitate mounting of the module. The outer surface of the cell cover 200 is formed with a plurality of linear protrusions spaced apart from each other in the width direction, the indentation formed in the center is formed with an indentation 233 for mounting the thermistor (not shown).

4 is a perspective view of a structure in which the unit battery modules 300 manufactured in FIG. 3 are stacked ('battery module stack'). Referring to FIG. 4, four unit battery modules 300 form one battery module stack 400 and include eight battery cells 100 as a whole. The electrode terminal vertically bent in the inward direction (FIG. 3: 120) overlaps the electrode terminal of another adjacent battery cell (not shown) and the vertically bent portion to form a welding plan portion 410.

FIG. 5 schematically shows the front view of FIG. 4, and FIG. 6 schematically shows the right shave of FIG. 4. Referring to these drawings, one side of the pair of battery cells 100 in the unit battery module 300 overlaps the electrode terminal vertically bent in the inward direction to form a welding plan portion 410, the opposite side Each of the electrode terminals is vertically bent in an outer direction of the unit battery module 300 to form an electrode terminal protruding from the battery cell 100 of another adjacent unit battery module 300 and a welding plan portion 412. have.

7 schematically illustrates a welding apparatus according to one embodiment of the present invention.

Referring to FIG. 7, the welding device 500 includes a support member 510 for fixing the battery module stack 400 manufactured in FIG. 4 and an upper surface of the welding plan portion 410 on which electrode terminals overlap. Welding wheel 520 moving while pressurizing, moving member 530 for moving the welding wheel 520 in the front and rear and left and right directions, welding rod 540 introduced to the lower surface of the welding plan portion 410, short generation during welding In order to prevent the structure is composed of a structure including an insulating member 550 is mounted between the welding scheduled portions 410 of the battery module stack (400).

The support member 510 includes a support guide 512 for supporting both sides and a bottom surface of the battery module stack 400, and a height adjusting member 514 for adjusting the height of the guide 512. The support guide 512 fixes the battery module stack 400 to maintain the aligned structure, and the height adjusting member 514 serves to move the plurality of welding scheduled portions 410 in the vertical direction. Sequential welding of the welding scheduled portions 410 by the 540 and the welding wheel 520 is possible.

FIG. 8 schematically illustrates an enlarged structure of the movable member in the welding apparatus of FIG. 1.

Referring to FIG. 8 together with FIG. 7, the movable member 530 is introduced into the upper end surface of the welding plan part 410 and the welding wheel 520 that moves left and right in the horizontal direction A while pressing the upper end surface, the welding wheel. The first block 532 and the welding wheel 520 which are moved in the horizontal direction A with respect to the welding scheduled portion 410 so that 520 can move while performing welding while being in close contact with the welding scheduled portion 410. ) Is composed of a second block 534 or the like which moves back and forth in the vertical direction B with respect to the welding scheduled portion 410.

The first block 532 and the second block 534 are composed of LM block-rail structures 536 and 538, by which the movable member 530 moves in the horizontal direction (A) and the vertical direction (B). It becomes movable.

Accordingly, the welding wheel 520 is introduced along the second block 534 into the upper end surface of the welding plan portion 410 and moves from left to right along the first block 532 while pressing the upper end surface. The government 410 is welded together with the welding rod 540. After welding, the welding wheel 520 mounted at the front end of the second block 534 is moved to the rear and left to restore the initial setting position for the next stage of welding.

FIG. 9 schematically shows an enlarged structure of a welding rod in the welding device of FIG. 1.

Referring to FIG. 9 together with FIG. 7, the welding rod 540 has a cylinder 542 installed at the rear thereof and has a structure penetrating one side surface of the welding rod support 544. Therefore, the welding rod 540 is introduced in one side of the welding plan portion 410 in a horizontal direction and is in close contact with the bottom surface of the welding plan portion 410, and after the welding, it is rearward from the bottom surface of the welding plan portion 410. Is removed by moving to. For reference, a structure in which the welding rod 540 is in close contact with the bottom surface of the welding plan portion 410 of the battery module stack 400 is illustrated in FIG. 7.

FIG. 10 schematically shows an enlarged structure of an insulating member in the welding apparatus of FIG. 1.

Referring to FIG. 10 together with FIG. 7, the insulating member 550 may include insulation barrier ribs 552 for preventing conduction between the welding scheduled portions 410, and a frame 554 integrally connecting the insulation barrier ribs 552. ) The insulating partitions 552 may be positioned between the welding scheduled portions 410 of the battery module stack 400 to prevent shorts caused by the welding scheduled portions 410 contacting each other during welding.

Meanwhile, a process of linear resistance welding of the electrode terminals of the battery module stack 400 using the welding apparatus 500 will be described with reference to FIG. 7 again.

First, the battery module stack 400 is mounted on the support member 510. At this time, a welding plan portion 410 in which a bent portion of an electrode terminal protruding in a '-' shape overlaps the welding rod 540. And the battery module stack 400 to be positioned in the direction of the welding wheel 520. Then, the insulating member 550 is mounted between the welding scheduled portions 410, and the welding rod 540 moves forward to closely contact the lower end of the welding scheduled portion 410. Then, the welding wheel 520 is moved forward by the moving member 530 to be in close contact with the welding scheduled portion 410 and then moved in the horizontal direction to perform linear resistance welding. After welding the welding plan portion 410 to connect the respective electrode terminals, the welding rod 540 and the welding wheel 520 are moved backward, and the support member 512 is moved upward (or downward). Next, the welding process described above is repeated to sequentially perform welding on other welding preliminaries.

11 illustrates an exemplary structure in which the battery module stack of FIG. 4 is mounted to a battery module case.

Referring to FIG. 11, the medium-large battery module 600 includes a battery module stack 400 completed by the linear resistance welding process of FIG. 7 in a module case including an upper case 610 and a lower case 620. It consists of a structure. Since the inside of the battery module stack 400 is the same as the structure of FIGS. 1 to 4 described above, the description will be omitted and the external structure of the medium-large battery module 600 will be mainly described.

In the upper case 610 of the medium-large battery module 600, a plurality of coolant inlets 612 are formed on an upper surface thereof for the inflow of the coolant. The lower case 620 has a structure that is coupled to the upper case 610 while surrounding the other end and the upper and lower portions of the battery module stack 400, the electrode of the battery module stack 400 on the front The external input / output terminal 622 connected to the terminal is configured to be located. A mounting coupling part 630 having fastening grooves 632 is formed at the bottom front and bottom of the medium and large battery module 600 so as to mount other battery modules to the outside.

As described above, in the welding apparatus according to the present invention, by placing the electrode and the insulating member on the electrode terminal welding scheduled portion of the battery module stack, and performing linear resistance welding, the weldability of the weld scheduled portion is greatly improved, and the welding Since it is possible to prevent the occurrence of a short, it is possible to reduce the failure rate of the battery and to greatly improve the safety. In addition, the electrode terminals of a large area can be welded at once, and the bonding force during welding between dissimilar metals can be improved.

Those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims.

1 to 4 are schematic views of a process of manufacturing a battery module stack;

5 and 6 are front and right side views of FIG. 4;

7 is a schematic view of a welding apparatus according to one embodiment of the present invention;

8 is a schematic view of an enlarged structure of the movable member in the welding device of FIG. 1;

9 is a schematic view of an enlarged structure of a welding rod in the welding device of FIG. 1;

FIG. 10 is a schematic view of an enlarged structure of an insulating member in the welding apparatus of FIG. 1; FIG.

FIG. 11 is a schematic view of one exemplary medium-large battery module in which the battery module stack of FIG. 4 is mounted in a battery module case.

Claims (17)

A device for welding the plate-shaped electrode terminals of the battery cell or battery module or the welding of the plate-shaped electrode terminal and the external circuit, a welding rod that is introduced to the lower surface of the welding plan portion and the welding to move while pressing the upper surface of the welding plan portion And a wheel, and performing linear resistance welding while pressing the upper surface of the welding wheel while supporting the lower surface of the welding plan portion with the welding rod. The welding device according to claim 1, wherein the battery cell is a plate-shaped battery cell. The battery module of claim 1, wherein the battery module includes plate-shaped battery cells having electrode terminals formed at upper and lower ends thereof, respectively. Two or more battery cells in which electrode terminals are interconnected in series and the connecting portions of the electrode terminals are bent to form a stacked structure; And A pair of high-strength cell covers coupled to each other to cover the entire outer surface of the battery cell stack except for the electrode terminal portion; Welding device, characterized in that the battery module comprising a. The welding device according to claim 1, wherein the welding plan portion is a portion in which two battery cells or battery modules are vertically bent so that adjacent plate-shaped electrode terminals overlap each other in a state of being sequentially stacked. The method of claim 1, wherein when the material of the positive terminal and the negative terminal of the battery cell is different and welding them in series, a welding terminal (welding rod or welding wheel) having a low resistance is placed on an electrode terminal having a high resistance value. And a welding terminal (welding wheel or welding rod) having a large resistance is placed on the electrode terminal having a relatively low resistance value. The method of claim 5, wherein when the battery cell includes a positive electrode terminal made of aluminum and a negative electrode terminal made of copper, a welding wheel made of molybdenum (Mo) or tin (Sn) material is placed on the copper electrode terminal. Welding device, characterized in that for placing the electrode rod welding rod made of chromium copper electrode. 5. The welding rod according to claim 4, wherein the welding rod is provided by a cylinder installed at the rear end so that the welding rod can be introduced from the horizontal (side) direction with respect to the welding scheduled portion to be brought into close contact with the bottom surface of the welding scheduled portion and removed after welding. Welding apparatus characterized by moving back and forth in the horizontal direction. 5. The welding wheel according to claim 4, wherein the welding wheel is perpendicular to the welding scheduled portion so that a welding wheel is introduced into the upper surface of the planned welding portion to move horizontally while pressing the upper surface and to be removed after welding. And a moving member which is installed on the movable member moving back, front, left, and right in the horizontal direction. The method of claim 8, wherein the moving member is composed of a first block moving in the horizontal direction with respect to the welding plan portion and a second block moving in the vertical direction, the first block and the second block is an LM block-rail structure Welding apparatus, characterized in that connected to. The welding apparatus according to claim 1, further comprising a support member for positioning the plurality of battery cells or battery modules in a stacked state so that two or more welding scheduled portions are positioned in the direction of the welding rod and the welding wheel. The welding apparatus according to claim 10, wherein the support member is configured to be movable in a vertical direction to enable aberration welding by a welding rod and a welding wheel to a plurality of welding scheduled portions. 11. The welding apparatus according to claim 10, wherein the support member includes guides (support guides) for supporting at least both sides of the stacked battery cells or battery modules. The welding apparatus according to claim 1, further comprising an insulating member between welding scheduled portions to prevent shorting during welding. The welding device according to claim 13, wherein the insulating member comprises a frame for integrally connecting the insulating partition walls and the insulating partition walls which are inserted between the welding scheduled portions with the welding scheduled portion exposed. A method of electrically connecting the plate-shaped electrode terminals of a battery cell or battery modules using a welding device according to any one of claims 1 to 14, (a) mounting two or more battery cells or battery modules on the support member such that the welding plan portion is positioned in the direction of the welding rod and the welding wheel; (b) mounting an insulating member between the welding scheduled portions; (c) advancing the welding rod to bring it into close contact with the lower end of the uppermost (or lowermost) welding scheduled part; (d) performing a linear resistance welding by advancing the welding wheel to bring the welding wheel into close contact with the welding plan portion and then moving in the horizontal direction; (e) reversing the welding wheel; And (f) repeating the steps (c) to (e) by moving the support member upward (or downward); Welding method comprising a. A high output large-capacity battery module manufactured by the method according to claim 15. The method of claim 16, wherein the medium-large battery module is composed of a plurality of battery modules having a structure in which two or more battery cells are coupled by a pair of cell covers, the battery cells between each other and the battery modules are plate-shaped electrodes Medium and large battery module, characterized in that the terminals are electrically connected by linear resistance welding in a state where the terminals are vertically bent and overlapped with each other.

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