KR101168880B1 - Conductive Connecting Member for Battery Cell - Google Patents

Abstract

The present invention relates to a conductive connection member for a battery cell, characterized in that a plated layer of nickel material is formed on a plate body made of iron, and is coupled to an electrode terminal of a secondary battery by resistance welding.

The conductive connection member according to the present invention can secure the economics of product production by reducing the use of nickel material having a low price competitiveness, and by solving the problems occurring during the welding process, improving productivity and greatly reducing the defective rate It can be effective.

Description

Conductive Connecting Member for Battery Cell

The present invention provides a conductive connection member for a battery cell, characterized in that a plated layer of nickel material is formed on a plate body of an iron material, and is coupled to an electrode terminal of a secondary battery by resistance welding.

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, or in the form of a medium-large battery pack 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 one battery power and capacity, while a medium or large device such as a notebook computer, an electric vehicle, or a hybrid electric vehicle is medium to large due to power and capacity problems. Use of a battery pack is required.

A medium-large battery pack is a battery structure in which a plurality of unit cells are electrically connected in series and / or in parallel. In the case of using a square or pouch type battery as a unit cell, the electrode terminals are placed on a bus bar after the wide sides are stacked to face each other. It can be manufactured easily by connecting by connecting members, such as these.

On the other hand, the cylindrical battery generally has a larger capacitance than the square and pouch cells, but is not easy to arrange in a laminated structure due to the external characteristics of the cylindrical battery.

Therefore, in the case of a notebook computer, a portable DVD, a small PC, etc., many battery packs in which a plurality of cylindrical batteries are connected in parallel and / or in series are used. 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.

On the other hand, wire, plate, FPCB, etc. are used for the electrical connection between the electrodes of the unit cell as a connection member for manufacturing a battery pack having such a structure.

The wire is a linear member made of a conductor. In general, since an insulating resin is coated on the outer surface of the linear conductor, the wire is easily deformed and inexpensive. However, spot welding, ultrasonic welding, It is difficult to make an electrical connection by welding such as laser welding, and in the welding process by soldering, a large amount of heat is transferred to the battery, thereby causing damage to the battery.

The plate has a merit that it is easy to perform welding as described above with respect to the battery electrode as a plate-shaped conductor member, but it has a disadvantage that it is difficult to achieve bonding even with some errors in the assembling process.

In addition, FPCB (Flexible Printed Circuit Board) (FPCB), which is widely used in recent years, has the advantages of easy welding with battery electrodes and suitable for electrical connection of complex structure, like the plate, but it is expensive and inferior in formability. There is a disadvantage that the assembly work is not easy.

In this regard, FIGS. 1 and 2 schematically show a process of manufacturing a battery pack having a 2P-3S linear structure using a nickel plate as a connecting member.

Referring to FIG. 1, first, the cells 20 and 21 are fixed to the jig 10, the nickel plate 30 is positioned on the terminals of the cell 20, and resistance welding is performed using the welding tip 40. These batteries 20 and 21 are connected in parallel. Then, as shown in FIG. 2, another pair of parallel cells 22 and 23 are resistance welded, and the first parallel cell pairs 20 and 21 and the second parallel cell pairs 22 and 23 are connected in series. In order to do this, they must be positioned at 90 degrees, and then the nickel plate 30 is also bent at 90 degrees and welded. The same is true for the third parallel cell pairs 24 and 25. Therefore, a very skilled technique and a special structure jig is required, and the work time is also very long. When the battery pairs 20, 21, 22, 23, 24, and 25 are unfolded in a line in the state where the welding operation is completed, a structure as shown in FIG.

3 is a schematic diagram showing a state in which three batteries constitute a battery pack having a 2P-3S structure in a state where electrical connection work in FIGS. 1 and 2 is completed. As in FIG. 3, three cell pairs of cells 20, 21, each connected in parallel, are connected in series via nickel plate 30.

As such, the battery pack manufacturing method according to the prior art using nickel plate uses 'nickel' as the main material of the connection member for the electrical connection, but 'nickel' is not only price competitive, but also has high internal resistance and poor deformation ability. And there are many problems, such as low adhesion, and research to compensate for the above problems are being actively conducted.

For example, in place of nickel, it is possible to assume a member of a copper material which is excellent in electrical conductivity and workability, but can secure a price competitiveness, but the copper material may be corroded, and due to high electrical conductivity, rather than resistance welding Since it does not accompany sufficient heat generation, it has a problem of making the welding process difficult.

In addition, Japanese Patent Application Laid-Open No. 2006-179228 discloses a single-wall or nickel-copper laminate in which tin, gold, silver, and copper are plated to provide wiring and connection leads for improving the thermal deformation ability of nickel. A technique is disclosed.

However, since nickel is used as the main material, it is difficult to solve the problem of price competitiveness of nickel, which is lower than other materials, and it has a high electrical conductivity and a large difference in the electrical conductivity of nickel. When welding a lead plated with silver, copper metal, or the like to the electrode terminal of a secondary battery, the current consumed by welding is biased with gold, silver, or copper metal, thereby preventing the smooth supply of heat required for welding. In the case of the above technique, too, there is a high possibility that welding failure occurs.

Accordingly, by reducing the amount of nickel and achieving the maximum welding efficiency, there is an urgent need to develop a technology for securing a connection member for producing a battery pack of an economical and efficient secondary battery.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made to solve the above-mentioned problems of the prior art and the technical problems required from the past.

The inventors of the present application, after repeated in-depth studies and various experiments, use a conductive connection member for a battery cell in which a plated layer of nickel material is formed on an iron plate body and is bonded to an electrode terminal of a secondary battery by resistance welding. In this case, it can be confirmed that the battery can have a variety of advantages such as improving the price competitiveness, as well as improving productivity and decreasing the defective rate, and thus, the present invention has been completed.

Therefore, the conductive connection member for a battery cell according to the present invention is characterized in that the plated layer of nickel material is formed on the plate body of the iron material, it is coupled to the electrode terminal of the secondary battery by resistance welding.

The conductive connection member for a battery cell solves the problems caused when welding using a connection member made of copper with high electrical conductivity or a connection member in which copper is plated on nickel, thereby improving the productivity of the battery cell and reducing the welding failure rate. Can be greatly reduced. In addition, by reducing the use of nickel material having a low price competitiveness compared to other metals that can be used as a connection member, it is possible to secure the economics of the production of the product and the price competitiveness of the product, the connection member according to the present invention is a pure nickel plate It is very resistant to corrosion by moisture and salts.

The connection member according to the present invention is coupled to the electrode terminal of the secondary battery by resistance welding. In one preferred example for easily performing resistance welding, an emboss structure is formed at one end of the connection member. Can be.

When the connection member is coupled to the electrode terminal of the secondary battery, the coupling of both contacts the welding rod to the opposite side indentation of the protrusion, with the connection member positioned so that the protrusion of the embossed structure is in contact with the connection scheduled portion of the battery cell. This can be done by performing resistance welding. By adjusting the contact area between the connecting member and the welding rod through this, it is possible to prevent the connecting member from sticking to the welding rod and to significantly reduce the defective rate of the product.

The embo structure is a structure in which protrusions and / or indentations are formed on one or both surfaces of a plate member, and protrusions are formed on one surface and indentations are formed on opposite surfaces of the protrusions. It is a concept to include.

The embossed structure may be formed at one end of the connecting member, and when the embossed structure is formed at the point where resistance welding is made, the temperature of the supplied current is concentrated to the projecting part of the embossed structure so that the point of heat generation is easily welded. Will be reached. In addition, as the protrusions selectively reach the welding temperature in comparison with the opposing indents, there is an effect of preventing the connection member from sticking to the welding rod.

The embossed structure is not particularly limited as long as the connection member is a suitable size to be combined with the battery, but may preferably be formed as a hemispherical protrusion having a radius of 0.4 to 1 mm.

The resistance welding is not particularly limited as long as it has a structure using a pair of electrodes, and in one preferred example, is performed by a pair of electrodes having different electrode characteristics, one of the electrodes (a) is Contact can be made on the indentation of the connecting member and the remaining electrode b can be made in direct contact with the device.

As a power source for resistance welding, an AC, DC, or high frequency power source can be used, and the path through which the current flows is not particularly limited, but is formed in the order of a welding rod (a), a connecting member, a secondary battery, and a welding rod (b). It is preferable.

As a conductive connecting member for electrical connection to the electrode terminal of the secondary battery, expensive pure nickel is conventionally used, and the use of such a nickel member serves as a main cause of raising the manufacturing cost of the battery.

On the other hand, the conductive connecting member of the present invention is formed with a plated layer of nickel material on the plate body of the iron material, there is an advantage in that the amount of nickel can be reduced and the economy is excellent.

In one preferred embodiment, the connecting member forms a nickel plated layer having a thickness of 1 to 6 μm on a cold rolled iron strip, and electroplated cobalt to a thickness of 0.01 to 0.1 μm on the nickel plated layer, and then 580 to 710 ° C. It can be produced by heat treatment at a temperature of. The connection member manufactured in this manner not only has excellent electrical conductivity, but also diffuses into the iron strip of nickel and cobalt as a base material during the heat treatment to form a solid solution, thereby providing excellent bonding force with the base material. Therefore, even when the plating layer is formed with a relatively thin thickness, since the possibility of peeling is low, it is not only excellent in economic efficiency, but also has an advantage of excellent corrosion resistance.

The nickel layer may have a thickness of preferably 1.5 to 5 μm, more preferably 2 μm. The thickness of the cobalt layer is preferably 0.1 to 0.5 ㎛, more preferably 0.1 ㎛.

The cold rolled iron strip may be a structure made of ferrite steel including cementite (Fe ₃ C). The ferritic steel is an alloy of carbon on the basis of iron, and in addition to carbon, the element may be additionally contained in iron, and the kinds of elements that may be added are, for example, Mn, P, S , Al, N and Ti may be one or two or more selected from the group consisting of.

In one preferred example, the cold rolled iron strip may consist of iron containing C, Mn, P, S, Al, N and Ti elements, the content of which is preferably carbon (C) 0.035 To 0.060%, manganese (Mn) 0.210 to 0.250%, phosphorus (P) 0.007 to 0.020%, sulfur (S) 0.005 to 0.015%, aluminum (Al) 0.035 to 0.065%, nitrogen (N) 0.002 to 0.008%, and Titanium (Ti) may be 0.005 to 0.020%.

As mentioned above, when the nickel plating layer is formed on the cold rolled iron strip, and the heat treatment is performed after the electroplating of cobalt on the nickel plating layer, nickel and cobalt are diffused to produce a conductive connection member having excellent interface bonding force. Can be. In addition, such a conductive connection member has a higher current flow than pure nickel, and when connected to a connection terminal of a battery cell, the conductive connection member may have excellent characteristics while securing price competitiveness compared to a battery cell using pure nickel plates.

The thickness of the nickel material plating layer is not particularly limited, and in consideration of the cost competitiveness of the material, it is preferable to have a thickness that can prevent oxidation and corrosion due to moisture or salt of the plate body, and does not impair the electrical conductivity. In consideration of this, it is preferable that the nickel material plating layer has a thickness of 2 to 6 μm.

In some cases, the plating layer may have a structure formed on all or part of one surface or both surfaces of the plate body, and in consideration of the oxidation and corrosion protection effects of the plate body, it is preferable that the plating layer is formed on both of the plate body. .

The connection member according to the present invention may be used, for example, in the manufacture of a battery pack including a parallel connection of two or more battery cells and a series connection of two or more battery cells.

In one preferred example for this purpose, the connecting member has a connecting portion for connecting to the protection circuit protruding on the outer surface of the plate body, and a slit is formed on the plate body to facilitate welding with the electrode terminal. A first type connecting member;

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 type connecting member 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. It may include; a third type connecting member is formed in the bending guide groove.

They can be selected according to the configuration of the desired battery pack. The first type connecting member is used to connect the unit cells only in the lateral direction, and the second type connecting member and the second type connecting member are simultaneously connected in the lateral direction and the longitudinal direction. And / or a third type connecting member can be used.

Therefore, by the combination of the three types of connection members as described above, it is possible to manufacture a battery pack having a variety of structures forming 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 in the above combination without the need to manufacture a metal plate separately. 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.

According to the configuration of the battery pack, the first type connecting member is used to connect the unit cells only in the lateral direction, and the second type connecting member and / or the third type connecting member when the unit cells are simultaneously connected in the lateral direction and the longitudinal direction. The unit cells of the lateral arrangement are preferably connected in parallel and the unit cells of the longitudinal arrangement are preferably connected in series.

In connecting the unit cells in the lateral direction and the longitudinal arrangement, the reason why the second type and the third type connecting members having different structures are selectively or used together is as described below. Alternatively, when the banks are connected in series over 3S, bending in opposite directions is required, and when connecting a protection circuit to the battery pack, it is recommended to install a metal plate such that the connection part is located on one side of the battery pack to minimize the connection length. It is because it is preferable.

The bending guide holes formed in the upper and / or lower surfaces of the central portion of the plate body in the second and third connection members are longitudinally oriented in the state in which the unit cell or bank is welded to the plate body. When arranged in the mean means the groove of the plate body is reduced in width so that the bending of the plate body can be easily. Preferably, the bending guide groove is formed symmetrically with each other on the top and bottom surfaces of the central portion of the plate body.

The bending guide groove may be formed in all of the connection portions of each connection member to facilitate vertical bending, and when connecting the connection member for the unit cell or bank by resistance welding, the electrode of the unit cell or bank of the plate body As described above, slits are formed at positions where the terminals are in contact, thereby improving weldability.

The present invention also provides a battery pack including a secondary battery that makes an electrical connection of two or more battery cells using the connection member.

The secondary battery that can be applied to the connection member is possible in various forms, preferably a cylindrical battery or a square battery, more preferably a battery having a cylindrical structure.

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

4 is a cross-sectional view showing the structure of the conductive connecting member according to the present invention.

Referring to FIG. 4, nickel plating layers 102 and 103 are formed on both surfaces of the plate body 101 made of iron. The nickel plating layers 102 and 103 serve to prevent oxidation and corrosion of the plate body 101 based on iron, and are formed on both surfaces of the plate body 101 with a thickness of about 2 μm. Cobalt plating layers (not shown) may be additionally formed on the nickel plating layers 102 and 103 in a thin thickness of about 0.1 μm in some cases.

5 is a schematic diagram showing a process of resistance welding the conductive connection member for a battery cell according to the present invention.

Referring to FIG. 5, the conductive connection member 200 is placed on the top of the battery cell 300 to be coupled, and the pair of electrodes 410 and 420 are in contact with each other. The conductive connecting member 200 is in contact with the connection scheduled portion of the battery cell 300. Resistance welding is performed by a pair of electrodes 410 and 420, one of the electrodes 410 is in contact with the connection site, the other electrode 420 is the top of the battery cell 300 It is in contact with the cotton. The electrodes 410 and 420 have different electrode characteristics, and the current of the resistance welding flows in the order of the electrode 410, the connection member 200, the battery cell 300, and the electrode 420. Will be done.

6 is a partial front view showing one end portion of the conductive connecting member having an embossed structure according to one embodiment of the present invention.

Two emboss structures 110a and 110b are formed at one end of the conductive connection member 100. Each of the emboss structures 110a and 110b serves to indicate a welding position with the battery cell. These emboss structures 110a and 110b may be variously formed in one or two or more numbers according to the required bonding strength.

FIG. 7 is a partial cross-sectional view of the embossed structure of the conductive connecting member shown in FIG. 6.

Referring to FIG. 7, an embossed structure 300 for connecting with a battery cell (not shown) is formed at one end of the conductive connection member, and a protrusion 301 is formed under the connection member to form the battery cell. The indentation 302 is formed on the opposite surface of the protrusion 301 to contact the welding rod 410 of any one of the pair of welding rods 410 and 420 of FIG. 5. When electricity is applied through one of the pair of electrodes 410, 420 of a resistance welding machine (not shown), the path of the applied current is concentrated to the protrusion 301 in contact with the battery cell. As a result, the protrusion 301 is first heated to reach the melting temperature. At this time, while the physical pressure is applied, the coupling between the conductive connection member and the battery cell is made.

The embossed structure 300 forms a hemispherical protrusion 301 having a radius of 0.4 mm, and the size of the embossed structure 300 can be variously adjusted according to the size of the battery 300 to be coupled.

FIG. 8 schematically shows a first type connecting member of the conductive connecting member according to the present invention, and FIG. 9 schematically shows various ways of connecting the connecting member to one surface of the bank.

Referring to these drawings, the first type connecting member 400 includes a connecting portion 420 protruding from one end of the plate main body 410 and slits 430 and 431 formed near both ends of the main body 410. It is. The slits 430 and 431 are formed at positions corresponding to the electrode terminals 711 and 721 of the first unit cell 710 and the second unit cell 720 constituting the bank 700. Improve weldability. The connection part 420 protrudes from the main body 410 at about 45 degrees, and a pair of bending guide grooves 421 and 422 are formed in the middle.

The position of the connecting portion 420 with respect to the bank 700 is four kinds of positions depending on how the first type connecting member 400 is welded to the electrode terminal of the bank 700, as indicated by the solid line in FIG. 8. 420, 420a, 420b, and 420c.

FIG. 10 schematically shows a second type connecting member of the conductive connecting member according to the present invention, and FIG. 11 schematically shows a third type connecting member.

First, referring to FIG. 10, in the second type connecting member 500, the connecting portion 520 protrudes from one end of the plate body 510 having a length approximately twice that of the first type connecting member of FIG. 8. In the center thereof, a pair of bending guide grooves 521 and 522 are formed.

Slits 530 and 533 are formed near both ends of the main body 510, and slits 531 and 532 are formed near the center of the main body 510, and a pair of bending guide grooves 511 is formed at the upper and lower ends of the main body 510. 512 is formed, and is divided into a main body left part 510a and a main body right part 510b around the bending guide grooves 511 and 512. Therefore, the bank (a) (not shown) connected to the main body left part 510a and the bank b connected to the main body right part 510b are bent based on the bending guide grooves 511 and 512. 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 type connecting member 500 is connected with the parallel connection of the unit cells in each bank (a, b) In addition, a series connection between the banks a and b connected to the left and right parts 510a and 510b of the main body is achieved.

In the third type connecting member 600 of FIG. 11, the connecting portion 620 is formed in the main body left portion 610a near the center of the plate main body 610, that is, in the vicinity of the bending guide grooves 611 and 612. Except that it is inclined at an angle symmetrical with respect to the connecting portion 520 of the member 500, it has the same structure as the second connecting member 500 of FIG.

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.

As described above, the conductive connection member according to the present invention can significantly reduce the use of nickel material having a low price competitiveness, thereby securing economics of product production, and by improving the productivity by solving the problem occurring during the welding process, It is effective to greatly reduce the defective rate.

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 view showing a coupling method of batteries manufactured through the process of FIGS. 1 and 2;

4 is a sectional view showing the structure of a conductive connecting member according to the present invention;

5 is a schematic diagram showing a resistance welding process of the conductive connecting member according to FIG. 4;

6 is a partial front view showing one end portion of a conductive connecting member according to one embodiment of the present invention;

FIG. 7 is a partial sectional view of an embossed structure of the conductive connecting member shown in FIG. 6; FIG.

FIG. 8 is a schematic diagram of a first type connecting member of the conductive connecting member according to the present invention, and FIG. 9 is a schematic diagram showing various ways in which the connecting member of FIG. 8 is connected to one surface of a bank;

10 is a schematic view of a second connecting member of the conductive connecting member according to the present invention, and FIG. 11 is a schematic view of a third connecting member.

Claims (15)

A plated layer of nickel is formed on the plate body of the iron material, and is bonded to the electrode terminal of the secondary battery by resistance welding. The resistance welding is performed by a pair of electrodes having different electrode characteristics, one electrode (a) of which is in contact with the indentation of the connecting member, the other electrode (b) is in direct contact with the battery cell A conductive connection member for a battery cell, characterized in that. The method of claim 1, wherein an emboss structure is formed at one end of the connecting member, and the projecting portion of the emboss structure is disposed so that the connecting member is placed in contact with a connection scheduled portion of the battery cell. A conductive connection member for a battery cell, characterized in that for performing resistance welding by contacting the electrode with the side indentation. The conductive connection member for a battery cell according to claim 2, wherein the emboss structure is formed as a hemispherical protrusion having a radius of 0.4 to 1 mm. delete The conductive connection member for a battery cell according to claim 1, wherein the current of the resistance welding flows in the order of a welding rod (a), a connecting member, a device, and a welding rod (b). The method of claim 1, wherein the connecting member is formed on the cold-rolled iron strip to form a nickel plating layer having a thickness of 1 to 6 ㎛, and after electroplating the cobalt to a thickness of 0.01 to 0.1 ㎛ on the nickel plating layer, 580 to 710 A conductive connection member for a battery cell, which is produced by heat treatment at a temperature of ℃. The method of claim 6, wherein the cold-rolled iron strip comprises carbon, manganese, phosphorus, sulfur, aluminum, nitrogen and titanium, the content of these components is 0.035 ~ 0.060% carbon (C), 0.210 ~ 0.250 manganese (Mn) %, Phosphorus (P) 0.007 to 0.020%, sulfur (S) 0.005 to 0.015%, aluminum (Al) 0.035 to 0.065%, nitrogen (N) 0.002 to 0.008%, and titanium (Ti) 0.005 to 0.020% A conductive connection member for a battery cell. 7. The conductive connection member for a battery cell according to claim 6, wherein the cold rolled iron strip is made of a ferrite steel structure including cementite (Fe ₃ C). The conductive connection member for a battery cell according to claim 1, wherein the plating layer of nickel material is formed to have a thickness of 2 to 6 mu m. The conductive connection member for a battery cell according to claim 1, wherein the nickel-plated layer is formed on all or part of one or both surfaces of the plate body. The method of claim 1, wherein the connection member is used for manufacturing a battery pack including a parallel connection of two or more battery cells and a series connection of two or more battery cells, A first type connecting member having a connection portion for connection with a protection circuit of the battery pack projecting on an outer surface of the plate body, and a slit formed in the plate body for facilitating welding with the battery cell electrode terminals; The connecting portion for connection with the protection circuit protrudes on the left or right outer surface of the plate body, and a slit is formed on the plate body to facilitate welding with the battery cell electrode terminals, and the upper surface of the central portion of the plate body, or A second type connecting member having a bending guide groove formed on a lower surface, or an upper surface and a lower surface; And The connection part 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 battery cell electrode terminals. A third type connecting member having a bending guide groove formed on a surface, or an upper surface and a lower surface; A conductive connection member for a battery cell, characterized in that for use in the combination consisting of a combination. The method according to claim 11, wherein the first type connection member is used to connect the unit cells only in the lateral direction and the second type connection member is connected to the side cells in the lateral direction and the longitudinal direction at the same time according to the configuration of the battery pack. A conductive connection member for a battery cell, characterized by using a third type connecting member, or a second type connecting member and a third type connecting member. A battery pack comprising a secondary battery which is electrically connected to two or more battery cells using the connection member according to claim 1. The method of claim 13, wherein the secondary battery is a battery pack, characterized in that the battery of a cylindrical structure. A plated layer of nickel material is formed on the plate body of iron material, is bonded to the electrode terminal of the secondary battery by resistance welding, and forms a nickel plated layer having a thickness of 1 to 6 μm on a cold rolled iron strip, and on the nickel plated layer A conductive connection member for a battery cell, characterized in that the cobalt is electrically fused to a thickness of 0.01 to 0.1 ㎛, and then heat-treated at a temperature of 580 to 710 ℃.

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