KR101232783B1 - secondary battery and manufacturing method thereof - Google Patents

Abstract

The present invention relates to a secondary battery, comprising: a battery cell in which an electrode assembly including a cathode / separation membrane / cathode is housed inside a case together with an electrolyte solution and sealed; A protection circuit module (PCM) that can be electrically connected to the battery cell; A fuse member that can be electrically connected to the battery cell and the PCM; And a top cap coupled to the battery cell to surround the PCM and the fuse member, the secondary battery comprising: a first junction joined to the first electrode terminal of the battery cell; and a surface mount end surface mounted to the PCM. A first lead plate having a; A second lead plate having a second junction portion joined to the fuse member and a third junction portion joined to the second electrode terminal of the battery cell; And an insulating member for insulating between the PCM and the fuse member and between the upper surface of the battery cell and the opposing surface of the PCM opposite the upper surface.

According to the present invention, a method of manufacturing a secondary battery is disclosed.

Secondary Battery, Pack, Clad, Lead Plate, Nickel, Top Cap, PCM, PTC, Fuse

Description

Secondary battery and manufacturing method thereof

The present invention relates to a secondary battery and a method of manufacturing the same. More particularly, various safety devices and the like are connected to a battery cell in a state in which an electrode assembly having a cathode / separation membrane / cathode structure is sealed in an interior of a case together with an electrolyte solution. A secondary battery having improved structure and method thereof and a method of manufacturing the same are provided.

With the development of technology and increasing demand for mobile devices, the demand for secondary batteries is also rapidly increasing. Among them, lithium (ion / polymer) secondary batteries have high energy density, high operating voltage, and excellent storage and life characteristics. Of course, it is widely used as an energy source for various electronic products.

However, since various combustible materials are built in the secondary battery, there is a risk of overheating, explosion, etc. due to overcharge, overcurrent, and other physical external shocks. Therefore, in the secondary battery, for example, safety devices such as PTC (Positive Temperature Coefficient), Protection Circuit Module (PCM), and the like are connected to the battery cell to effectively control abnormal conditions such as overcharge and overcurrent. It is configured to

In general, safety elements for secondary batteries such as PCM are connected to electrode terminals of a battery cell by a bonding or soldering method through a conductive nickel plate. That is, the nickel plate is bonded or soldered to the tab portion of the PCM, and then the nickel plate is electrically connected to the battery cell by bonding or soldering the nickel plate to the electrode terminal of the battery cell, and then the top of the battery cell. To prepare a secondary battery in the form of a pack in which an insulating top cap is assembled.

On the other hand, the safety devices including the PCM must maintain the electrical connection with the electrode terminals of the battery cell and at the same time maintain an electrical insulation state with other parts of the battery cell. A large number of insulating elements such as a lead plate are required to form this type of connection structure, and their detailed connection method not only complicates the assembly process of the battery pack for secondary batteries, but also requires relatively little space for storing the battery cells. Will decrease. In addition, in the sequential manufacturing method as described above, the manufacturing process of the battery pack for secondary batteries, which connects the PCM and the battery cells by the nickel plate and then combines the insulating top cap thereon, is continuously configured, so that a defect in one process When it occurs, it causes defects of other processes, so it is difficult to drastically improve the defect rate, and it is difficult to outsource the processes.

Furthermore, in the assembling process of the battery pack for secondary batteries according to the prior art, a nickel plate is mainly used to connect the lead plate to the electrode terminal of the battery cell, and such nickel plate is not bonded to the positive terminal of the battery cell made of aluminum. Therefore, the clad metal member having one side made of nickel and the other side made of aluminum is first attached to the positive electrode terminal of the battery cell, and then the nickel plate connected with the safety inspection is bonded to the nickel side of the clad metal member again. The secondary battery and its manufacturing method according to the prior art has a problem that the number of unnecessary parts and the number of assembly accordingly increases.

SUMMARY OF THE INVENTION The present invention has been conceived to solve the above problems, and provides a novel secondary battery and a method of manufacturing the same so that the number of parts can be reduced and the process can be further simplified while maintaining a bolting assembly method having mechanical safety and low difficulty. The purpose is.

In addition, the present invention lowers the assembly failure rate by integrating components such as PCM, top cap, and lead plate, and at the same time convenient, stable and simple to combine the components associated with the safety device coupled to the top of the battery cell, It is an object of the present invention to provide a secondary battery having improved structure and process so as to increase the capacity of the battery cell and a method of manufacturing the same.

In order to achieve the above object, a secondary battery according to an exemplary embodiment of the present invention includes a battery cell in which an electrode assembly including an anode / separation membrane / cathode is housed in an interior of a case together with an electrolyte; A protection circuit module (PCM) that can be electrically connected to the battery cell; A fuse member electrically connected to the battery cell and the PCM; And a top cap coupled to the battery cell so as to surround the PCM and the fuse member, the secondary battery comprising: a first junction joined to a first electrode terminal of the battery cell; A first lead plate having a surface mount end mounted thereon; A second lead plate having a second junction portion joined to the fuse member and a third junction portion joined to a second electrode terminal of the battery cell; And an insulating member that insulates between the PCM and the fuse member and between an upper surface of the battery cell and an opposite surface of the PCM opposite the upper surface.

Preferably, the first electrode terminal is a positive terminal, and the second electrode terminal is a negative terminal.

Preferably, the case of the battery cell comprises a metallic can.

Preferably, the first lead plate is a clad metal bonded to the main body by a body part including nickel and the first joining part by aluminum.

Preferably, the top cap further includes a connector electrically connected to the PCM and housed therein so as to be connected to a terminal of an external device.

Preferably, the first lead plate and the second lead plate each include bent portions that can be bent when the top cap is coupled to the battery cell.

Preferably, the apparatus further includes a coupling member for coupling the top cap to the battery cell while the top cap is positioned on the battery cell.

Preferably, the coupling member includes: at least one pair of coupling holes formed through both ends of the top cap; A coupling groove provided in an upper portion of the battery cell so as to correspond to the coupling hole; And a coupling piece that passes through the coupling hole and is fixed to the coupling groove.

Preferably, the fuse member is replaceable with a PTC element.

Preferably, the secondary battery further includes an outer film that can be attached to the outer surface of the battery cell.

Preferably, the first lead plate further comprises a connection portion connecting the surface mount end and the first junction, the surface mount end is in contact with one surface of the PCM facing the top cap, the connection portion is And a first connection part extending vertically from the surface mount end to be in contact with the side surface of the PCM, and a second connection part extending from the end of the first connection part parallel to the surface mount end.

Preferably, the length of the surface mount end is formed longer than the width of the connection portion.

In order to achieve the above object, a secondary battery manufacturing method according to a preferred embodiment of the present invention, (a) an electrode assembly including a positive electrode / separator / negative electrode is housed in the case with an electrolyte solution and sealed sealed Preparing; (b) connecting a first lead plate, which may be connected to the first electrode terminal of the battery cell, to a protection circuit module (PCM) by surface mount technology; (c) bonding a fuse member or a PTC element with a second lead plate to which the second electrode terminal of the battery cell is attached, to the PCM; (d) forming a top cap assembly by bonding the PCM and a connector housed in a top cap that can be coupled to an upper end of the battery cell; (e) attaching the first lead plate and the second lead plate to the first electrode terminal and the second electrode terminal of the battery cell, respectively, such that the top cap assembly is positioned substantially perpendicular to the top side of the battery cell; Conjugating; (f) bending the first and second lead plates, respectively, such that the top cap is positioned parallel to the top of the battery cell; And (h) coupling the top cap with the battery cell.

Preferably, before the step (c), further comprising the step of interposing a first insulating member between the PCM and the fuse member or PTC element.

Preferably, before the step (f), further comprising the step of attaching a second insulating member to cover the PCM and the fuse member or PTC element.

Preferably, the first electrode terminal is a positive terminal, and the second electrode terminal is a negative terminal.

Preferably, the first lead plate is a clad metal bonded to the main body by a body part including nickel and the first joining part by aluminum.

Preferably, the step (h) includes fixing at least one pair of coupling holes formed through both ends of the top cap and a coupling piece through coupling grooves provided in an upper portion of the battery cell so as to correspond to the coupling holes.

Preferably, after the step (h), further comprising the step of attaching the outer film on the outer surface of the battery cell.

The secondary battery and the manufacturing method thereof according to the present invention has the following effects.

First, the number of parts and the number of processes can be reduced by implementing an assembly in which a new lead plate in which a conventional clad metal and a nickel plate are integrated directly is connected to a PCM by surface mounting technology.

Second, by performing the conventional manual welding method by the surface mounting technology, by reducing the process, and by preventing the distortion of the lead plate, it is possible to improve the safety and durability of the structure.

Thirdly, in the top cap assembly in which the PCM and / or the fuse member is embedded in the top cap together with the insulating member, by attaching the top cap assembly to the battery cell by connecting and bending the lead plates, the defective rate of the connecting portion is greatly reduced. The manufacturing process of the secondary battery can be greatly simplified.

Fourth, unlike the conventional insulating mounting member, by using a thin insulating tape, it is possible to minimize the mounting space for the safety device on the top of the battery cell, improve the ease of operation, and also reduce the manufacturing cost.

Hereinafter, a rechargeable battery and a method of manufacturing the same according to an exemplary embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a perspective view schematically illustrating a process of assembling a secondary battery according to an exemplary embodiment of the present invention, FIG. 2 is an exploded perspective view of a PCM and a fuse member of FIG. 1, and FIG. 3 is a component of FIG. 2. Is an exploded perspective view of the assembly and the top cap combined with each other, Figure 4 is a perspective view of the components of Figure 3 combined.

1 to 4, a secondary battery 100 according to a preferred embodiment of the present invention includes a battery cell 10 having a first electrode terminal 12 and a second electrode terminal 14, and a battery cell. A protection circuit module (hereinafter, referred to as a 'PCM') 20 that may be electrically connected to the 10, and a fuse member 30 that may be electrically connected to the battery cell 10 and the PCM 20. ), A top cap 40 coupled to the battery cell 10 to surround the PCM 20 and the fuse member 30, and a first junction 52 and a surface mount end 54. A second having a first lead plate 50, a second bonding portion 62 bonded to the fuse member 30, and a third bonding portion 64 bonded to the second electrode terminal 14 of the battery cell 10. Lead plate 60; An insulating member for insulating the PCM 20 and the fuse member 30 and between the upper surface of the battery cell 10 and the opposite surface 21 of the PCM 20 together with the fuse member 30 is provided.

The battery cell 10 is sealed by receiving an electrode assembly (not shown) and an electrolyte (not shown) inside the case 16 in the form of a metallic can. Here, the electrode assembly has a structure in which one or more unit electrode bodies including the anode / separator / cathode are stacked or wound in a jelly-roll type. The first electrode terminal 12 and the second electrode terminal 14 are provided at the upper end of the case 16. Here, the first electrode terminal 12 represents the positive electrode terminal, and the second electrode terminal 14 represents the negative electrode terminal, respectively.

The case 16 of the battery cell 10 has a pair of coupling grooves 11 and 13 formed at both ends of the upper horizontal surface. The sealing cap 15 is for sealing the injection hole after the electrolyte is filled through the electrolyte injection hole (not shown), and a metallic ball, a polymer resin, or the like is used.

The battery cell 10 is provided with a first electrode terminal 12 and a second electrode terminal 14 insulated from the metallic case 16, respectively. The first electrode terminal 12 is formed in the substantially entire surface of the upper portion of the case 16, and the second electrode terminal 14 is formed in the approximately center portion of the case 16. On the other hand, the first electrode terminal 12 and the second electrode terminal 14, for example, depending on the purpose or structure of the secondary battery 100 used, protrude side by side on the top of the battery case 16, or a battery case ( It will be understood by those skilled in the art that various parts of the case 16 may be disposed, such as disposed at the top and the bottom of 16, respectively. In addition, in the secondary battery 100 according to the present embodiment, the internal structure and the external shape of the battery cell 10 have been described with reference to a square battery, but it can be applied to a battery structure such as cylindrical or pouch type. Will be self explanatory.

The PCM 20 is a type of safety element of the secondary battery 100, and includes a substrate (PCB) provided with a protection circuit. In the form of an elongated plate including an upper surface 23 facing the top cap 40 in the fuse connection part 22 and the surface mounting technology that is electrically connected to the fuse member 30 by soldering or welding, etc. , A surface mount portion 24 on which the first lead plate 50 is surface mounted by a method called 'SMT'.

The fuse member 30 is a safety device of the secondary battery 100, and includes a first end 32 and a second lead connected to the fuse connecting portion 22 of the PCM 20 by welding or soldering. It has a second end 34 to which the plate 60 is connected. On the other hand, in alternative embodiments, the fuse member 30 may be replaced with a PTC device (not shown). The selection of the fuse member 30 and the PTC element may be appropriately made depending on the size, structure, performance of the secondary battery 100 to be manufactured, or the type, property, voltage, current characteristic, use, etc. of the electronic device in which the secondary battery 100 is to be used. It can be understood by those skilled in the art.

The top cap 40 is made of an electrically insulating material, and a pair of coupling holes 42 and 44 communicating with the coupling grooves 11 and 13 of the battery cell 10 are penetrated at both ends thereof. have. When assembling, a coupling piece such as a bolt, a screw, a pin, or the like (not shown) in a state where the coupling grooves 11 and 13 of the battery cell 10 and the coupling holes 42 and 44 of the top cap are aligned. When fastened by using the top cap 40 is fixed to the battery cell (10). In addition, the top cap 40 is equipped with various types of connectors 46 (see FIG. 3) in which positions are fixed in advance by hooks (not shown). Here, the connector 46 is electrically connected to the PCM 20 by soldering or the like during assembly, and is a member for allowing the finished secondary battery 100 to be connected to a terminal (not shown) of an external device. In an embodiment, a tabby-typer is used. It will be apparent to those skilled in the art that the top cap 40 can be used with various connectors according to various types of pack structures instead of these tabby connectors.

FIG. 5 is a perspective view of the first lead plate of FIGS. 1 to 4, and FIG. 6 is a fragmentary perspective view illustrating a state in which the first lead plate of FIG. 5 is attached to the PCM.

5 and 6, the first lead plate 50 is for electrically connecting the PCM 20 and the first electrode terminal 12 of the battery cell 10. The surface mount end 54 is connected to the first lead plate 50. A first bent part 56 including a main body made of nickel, a first junction part 52 made of aluminum, and a top cap 40 that may be bent in the process of being coupled and / or assembled to the battery cell 10, and And a connection portion 58 connecting the surface mount end 54 and the first junction portion 52.

The first lead plate 50 is, for example, soldering, hot rolling, cold rolling or explosion welding, such as the first bonding portion 52 is bonded to the main body by the cold rolling method, so-called 'clad metal ( clad metal) 'structure.

The surface mount end 54 is attached to the top surface 23 of the PCM 20 facing the top cap 40 by surface mount technology. In addition, the connecting portion 58 of the first lead plate 50 extends vertically from the surface mounting end 54 to be in contact with the side surface of the PCM 20, and the surface mounting end 54. And a second connecting portion 58b extending from an end of the first connecting portion 58a to be parallel. Here, since the length of the surface mounting end 54 in the direction parallel to the longitudinal direction of the PCM 20 is formed longer than the width in the direction parallel to the longitudinal direction of the PCM 20 of the connection portion 58, The first lead plate 50 may be stably attached to the PCM 20. In addition, the first bonding portion 52 attached to the end of the second connecting portion 58b is connected to the connecting portion 58 and the surface-mounting end 54 so as to enable stable connection with the first electrode terminal 12 of the battery cell 10. It is formed to extend longer than the length of.

FIG. 7 is a physical diagram of photographing a state in which a first lead plate is surface mounted on a PCM according to another exemplary embodiment of the present invention.

Referring to FIG. 7, in the PCM assembly 20a according to the present exemplary embodiment, various elements such as a printed circuit board are arranged on the upper surface of the PCM 20 'and the first lead plate 50' is different from other components. It can be seen that the SMT is bonded to the PCM 20 '.

That is, according to the embodiments of the present invention, the first lead plate 50 is manufactured by using a clad material, and the surface mount end 54 made of nickel is applied to the surface mount technology on one surface of the PCM 20. By attaching first to prepare a separate assembly, there is no fear of twisting when assembling or using, and attaching the first bonding portion 52 made of aluminum directly to the first electrode terminal 12 of the battery cell 10. Therefore, the conventional clad metal can be omitted and attached directly to the top of the battery cell 10, and the number of parts and processes can be reduced.

Referring back to FIGS. 1 to 4, the second lead plate 60 is for electrically connecting the fuse member 30 and the second electrode terminal 14 of the battery cell 10, as described above. Similarly, the third joining portion 64 joined to the second electrode terminal 14 of the battery cell 10 by, for example, spot welding or the like, and the fuse member (for example, by spot welding or the like). A second joining portion 62 joined to the second end 34 of 30 is provided. In the second lead plate 60, a second bent portion 66 is formed between the second junction portion 62 and the third junction portion 64. After the fuse member 30 is accommodated in the top cap 40, the second bent portion 66 may have the second lead plate 60 formed by the second junction 62 and the third junction 64, respectively. Bending the top cap 40 with respect to the battery cell 10 to secure the top cap 40 to the battery cell 10 in a state of being bonded to the second electrode terminal 14 and the fuse member 30 of FIG. When bending, it is a portion that is bent in the direction of arrow "A" of FIG. 1 together with the first bent portion 56 of the first lead plate 50.

The insulating member includes a first insulating member 70 and a second insulating member 80. The first insulating member 70 is to electrically insulate at least a portion of the opposing surface 21 of the PCM 20 from at least a portion of the fuse member 30. It is convenient in the process to first attach to the opposing surface 21 of the PCM 20 by an adhesive or the like before bonding to 20). Of course, it is also conceivable to attach the fuse member 30 to the PCM 20 after attaching the first insulation member 70 to one surface of the fuse member 30. To this end, the first insulating member 70 may be a material already known as a tape structure of the insulating material.

The second insulating member 80 is interposed between the upper surface of the battery cell 10 and the substantially entire area of the opposing surface 21 of the PCM 20, including the fuse member 30, and assembled to the top cap 40. The fuse member 30 and the PCM 20 are electrically insulated from the first and second electrode terminals 14 of the battery cell 10. As the second insulating member 80, for example, a Nomex tape may be used.

A method of manufacturing a secondary battery according to a preferred embodiment of the present invention will be described with reference to FIGS. 1 to 6.

First, as shown in FIG. 1, an electrode assembly including an anode / separator / cathode is accommodated together with an electrolyte in the case 16 to prepare a sealed battery cell. Subsequently, a PCM assembly 20B is prepared in which the first lead plate 50 of FIG. 5 is electrically connected to the protection circuit module PCM of FIG. 6 by surface mounting technology.

Meanwhile, as shown in FIG. 2, the fourth junction portion 68 of the second lead plate 60 connects the fuse assembly 30a attached to the second end 34 of the fuse member 30 by spot welding or the like. Prepare separately. Here, in the preparation of the PCM assembly 20B and the fuse assembly 30a, the pre and post problems are not important, and in the fuse assembly 30a, the fuse member 30 may be replaced with a PTC element. to be.

Next, as shown in FIG. 2, after attaching the first insulating member 70 to the opposing surface 21 of the PCM 20, the fuse connecting portion 22 and the fuse member 30 of the PCM 20 are attached. The first end 32 is joined by a method such as spot welding to provide the safety device assembly 30b of FIG. 3. Here, the safety device assembly 30b of FIG. 3 is a part of a combined perspective view symmetrically 180 degrees of the exploded perspective view of FIG. 2.

3, the safety device assembly 30b is coupled to the top cap in which the separately prepared connector 46 is accommodated, thereby forming the top cap assembly 40a illustrated in FIG. 4. In this process, the connector 46 housed in the top cap 40 is bonded to the PCM 20 by soldering or the like.

Next, as shown in FIG. 4, in the top cap assembly 40a with the PCM 20 and the fuse member 30 coupled to the top cap 40, the bottom surface of the top cap assembly 40a, that is, PCM The second insulating member 80 is attached to the opposing surface 21 of 20. In this process, since the second insulating member 80 has a size that can substantially completely cover the PCM 20 and the fuse member 30, even if the top cap 40 is bent relative to the battery cell 10, The upper surface of the battery cell 10, in particular, the first and second lead plates 60 which are bent by the first and second bends 56 and 66 and the first and second electrode terminals electrically connected thereto ( 12) 14 is prevented from being electrically connected to the PCM 20 and the fuse member 30.

Subsequently, the first lead plate 50 and the second lead plate 60 are respectively positioned so that the top cap assembly 40a of FIG. 4 is positioned substantially vertically in the longitudinal side of the top of the battery cell 10. The first electrode terminal 12 and the second electrode terminal 14 of 10 are bonded to each other. Here, the first junction 52 of the first lead plate 50 connected to the PCM 20 coupled to the top cap assembly 40a and the third junction 64 of the fuse member 30 are each a battery cell ( The first electrode terminal and the second electrode terminal 14 of 10) are bonded by, for example, spot welding or the like.

Next, center the first and second lead plates 50 and 60 and the first and second bends 56 and 66 so that the bottom surface of the top cap 40 is positioned in parallel with the top surface of the battery cell 10. The predetermined angle is bent. Then, as shown in FIG. 8, the coupling holes 42 and 44 of the top cap 40 are positioned substantially in line with the coupling grooves 11 and 13 of the battery cell 10. Subsequently, as shown in FIG. 8, when the coupling piece 90 (see FIG. 8) passes through the coupling holes 42 and 44 to be coupled to the coupling grooves 11 and 13, the top cap assembly 40a is formed. It is fixed to the top of the battery cell 10.

9 is an exploded perspective view of a battery cell, an insulating lower cap, and an outer film according to another preferred embodiment of the present invention.

9, in the secondary battery 200 according to another exemplary embodiment of the present invention, an insulating lower cap 120 is coupled to a lower end of the battery cell 110, and the case 112 of the battery cell 110 is coupled. The outer film 130 is attached to the outer surface. The outer film 130 coupled to the outer surface of the case 112 may secure an electrical insulation state with the outside of the secondary battery 200 and display information of a product of the secondary battery 200. In addition, the exterior film 130 is manufactured in the form of a tube made of a heat-shrinkable material and is in close contact with the surface of the case 112 of the battery cell 110 by heat applied after wrapping the battery cell 110.

On the other hand, in the secondary battery 200 according to the present embodiment, the process of attaching the lower cap 120 and / or the outer film 130 to the battery cell 110, as described above, the battery to the top cap 40 Of course, this may be done after the connection and coupling to the cell 10, or may be done before.

In the above, although the present invention has been described by means of limited embodiments and drawings, the present invention is not limited thereto and is described below by the person skilled in the art and the technical spirit of the present invention. Various modifications and variations are possible without departing from the scope of the appended claims.

The following drawings, which are attached to this specification, illustrate exemplary embodiments of the present invention, and together with the detailed description of the present invention serve to further understand the technical spirit of the present invention, the present invention includes matters described in such drawings. It should not be construed as limited to.

1 is a perspective view schematically illustrating an assembly process of a rechargeable battery according to an exemplary embodiment of the present invention.

FIG. 2 is an exploded perspective view of the PCM and fuse member portions of FIG. 1. FIG.

3 is an exploded perspective view of the top cap and the assembly to which the components of FIG. 2 are coupled;

4 is a perspective view of a state in which the components of FIG. 3 are coupled.

5 is a perspective view of the first lead plate of FIGS. 1 to 4.

FIG. 6 is a fragmentary perspective view illustrating a state in which the first lead plate of FIG. 5 is attached to the PCM. FIG.

FIG. 7 is a physical diagram of photographing a state in which a first lead plate is surface mounted on a PCM according to another exemplary embodiment of the present invention.

8 is an exploded perspective view of a rechargeable battery according to an exemplary embodiment of the present invention.

9 is an exploded perspective view of a battery cell, an insulating lower cap, and an outer film according to another preferred embodiment of the present invention.

Claims (20)

A battery cell in which an electrode assembly including an anode / separation membrane / cathode is accommodated inside an case together with an electrolyte solution and sealed; A protection circuit module (PCM) electrically connected to the battery cell; A fuse member electrically connected to the battery cell and the PCM; And a top cap coupled to the battery cell to surround the PCM and the fuse member. A first lead plate having a first junction portion bonded to the first electrode terminal of the battery cell, and a surface mount end surface mounted to the PCM; A second lead plate having a second junction portion joined to the fuse member and a third junction portion joined to a second electrode terminal of the battery cell; And And an insulating member insulated between the PCM and the fuse member and between an upper surface of the battery cell and an opposite surface of the PCM opposite the upper surface. The method of claim 1, And the first electrode terminal is a positive electrode terminal, and the second electrode terminal is a negative electrode terminal. The method according to claim 1 or 2, The case of the battery cell is a secondary battery, characterized in that it comprises a metallic can. 3. The method of claim 2, The first lead plate is a secondary battery, characterized in that the body portion including the surface-mounted end is made of nickel, the first bonding portion is made of aluminum clad metal bonded to the body portion. The method of claim 1, The top cap further comprises a connector electrically connected to the PCM and housed therein so as to be connected to a terminal of an external device. The method of claim 1, And the first lead plate and the second lead plate each include bent portions that can be bent when the top cap is coupled to the battery cell. The method of claim 1, And a coupling member for coupling the top cap to the battery cell while the top cap is positioned on the battery cell. The method of claim 7, wherein The coupling member At least one pair of coupling holes formed through both ends of the top cap; A coupling groove provided in an upper portion of the battery cell so as to correspond to the coupling hole; And Secondary battery characterized in that it comprises a coupling piece that is fixed to the coupling groove through the coupling hole. The method of claim 1, And the fuse member is replaced with a PTC element. The method of claim 1, The secondary battery further comprises an outer film that can be attached to the outer surface of the battery cell. The method of claim 1, The first lead plate further includes a connection portion connecting the surface mount end and the first junction portion, The surface mount end is in contact with one surface of the PCM facing the top cap, The connection part includes a first connection part extending vertically from the surface mount end to be in contact with the side surface of the PCM, and a second connection part extending from the end of the first connection part to be parallel to the surface mount end. Secondary battery. 12. The method of claim 11, The length of the surface mount end is longer than the width of the connecting portion secondary battery, characterized in that formed. (a) preparing an sealed battery cell in which an electrode assembly including an anode / separator / cathode is accommodated together with an electrolyte in a case; (b) connecting a first lead plate, which may be connected to the first electrode terminal of the battery cell, to a protection circuit module (PCM) by surface mount technology; (c) bonding a fuse member or a PTC element with a second lead plate to which the second electrode terminal of the battery cell is attached, to the PCM; (d) joining the PCM and a connector housed in a top cap that can be coupled to an upper end of the battery cell to form a top cap assembly; (e) attaching the first lead plate and the second lead plate to the first electrode terminal and the second electrode terminal of the battery cell, respectively, such that the top cap assembly is positioned substantially perpendicular to the top side of the battery cell; Conjugating; (f) bending the first and second lead plates, respectively, such that the top cap is positioned parallel to the top of the battery cell; And (H) a secondary battery manufacturing method comprising the step of coupling the top cap and the battery cell. 14. The method of claim 13, Before the step (c), further comprising the step of interposing a first insulating member between the PCM and the fuse member or PTC element. 14. The method of claim 13, Before the step (f), further comprising the step of attaching a second insulating member to cover the PCM and the fuse member or PTC element. 14. The method of claim 13, And the first electrode terminal is a positive electrode terminal, and the second electrode terminal is a negative electrode terminal. 17. The method of claim 16, The first lead plate is a manufacturing method of a secondary battery, characterized in that the body portion including the surface-mounted end is made of nickel, the first bonding portion is a clad metal bonded to the body portion made of aluminum. 14. The method of claim 13, Step (h) is And fixing a coupling piece through at least one pair of coupling holes formed through both ends of the top cap and coupling grooves provided in an upper portion of the battery cell so as to correspond to the coupling holes. 14. The method of claim 13, After the step (h), further comprising the step of attaching the outer film on the outer surface of the battery cell. A secondary battery produced by the method of claim 13.

Images