KR101130048B1 - Secondary Battery Pack Having PCM Assembly of Novel Structure - Google Patents

Abstract

The present invention is a battery cell in which the electrode assembly of the anode / separator / cathode structure is sealed in the battery case together with the electrolyte; An opening is formed to expose the electrode terminals of the battery cell, and has a structure in which a PCM assembly is mounted on the top, and an insulating mounting member mounted on an upper surface of the battery cell; It consists of a protection circuit module (PCM) and connecting members (A, B) coupled to the lower surface of the PCM, two or more connecting through holes are perforated, and the connecting members are connected to the circuit of the PCM. PCM assembly is coupled to the structure exposed through the through-hole for connecting the furnace; A PTC device positioned on an electrical connection circuit between the PCM assembly and the battery cell, and having a bottom connection lead directly coupled to an upper surface of the battery case; And an insulating cap coupled to an upper end of the battery cell while surrounding the insulating mounting member in a state where the PCM assembly is mounted, and connected from an upper portion of the PCM while the insulating mounting member and the PCM assembly are mounted on the battery cell. A secondary battery pack is provided to achieve electrical connection between members, a battery cell electrode terminal, and a PTC device.

Description

Secondary Battery Pack Having PCM Assembly of Novel Structure

The present invention relates to a secondary battery pack including a PCM assembly having a novel structure, and more particularly, a battery cell, an insulating mounting member, a PCM assembly in which connection members are coupled to a lower surface of a specific structure, and an upper end of a battery case. A PTC element coupled directly to the surface, and an insulating cap, and electrically connecting the connecting members, the battery cell electrode terminals, and the PTC element from the top of the PCM with the insulating mounting member and the PCM assembly mounted on the battery cell. The present invention relates to a secondary battery pack.

With the development of technology and increasing demand for mobile devices, the demand for secondary batteries is also rapidly increasing. Among them, lithium secondary batteries with high energy density, high operating voltage, and excellent storage and life characteristics are used for various mobile devices as well as various electronic products. It is widely used as an energy source.

However, since lithium secondary batteries contain various combustible materials, there is a risk of overheating, explosion, etc. due to overcharging, overcurrent, and other physical external shocks, and thus has great disadvantages in safety. Therefore, a lithium secondary battery has a PTC (Positive Temperature Coefficient) element and a protection circuit module (PCM) connected to the battery cell as a safety device that can effectively control abnormal conditions such as overcharge and overcurrent. It is mounted.

In general, PCM is connected to the battery cell by welding or soldering via a conductive nickel plate. That is, the battery pack is manufactured by connecting the PCM to the battery cell by welding or soldering a nickel plate to the electrode tab of the PCM, and then welding or soldering the nickel plate to the electrode terminal of the battery cell, respectively.

These safety devices, including PCM, must maintain electrical connection with the electrode terminals while maintaining electrical isolation from other parts of the battery cell. Since a plurality of insulating mounting members or a plurality of components are required to configure such a connection form, the assembly process of the battery pack is complicated and the space for accommodating the battery cells is relatively reduced.

In addition, a plurality of welding or soldering is required in order to configure the battery pack, such welding, etc., because the small structure of the secondary battery has to be carried out in a very precise work, there is a high probability of failure. Moreover, the addition of such a process during the manufacturing process of the product acts as a factor that increases the product cost.

Therefore, researches on technologies for reducing the number of components mounted on the top of the battery cells and increasing the capacity of the battery cells are actively conducted. For example, Korean Patent Application Publication No. 2004-0021308 discloses an electrode assembly comprising a negative electrode plate, a positive electrode plate, and a separator for insulating the negative electrode plate and the positive electrode plate; A can containing the electrode assembly, the opening having one surface, a first round surface provided on one side, and a first flat surface provided on the other side opposite to the first round surface; And a cap assembly sealed to the opening of the can and electrically connecting at least one electrode plate of the negative electrode plate and the positive electrode plate to the outside, the cap assembly having a cap plate for sealing the opening of the can. A technique for attaching a safety element to a first flat surface is disclosed.

However, the above technique is easy to attach the safety device to the flat surface because the safety device is attached to the first flat surface, which is the outer surface of the battery can, there is a problem that increases the volume of the battery pack as a whole.

Therefore, the assembly process is simplified by reducing the number of members mounted on the top of the battery cell, and the number of welding processes is reduced to reduce the occurrence of defects. There is a high need for a technology that can also increase the capacity of.

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

Specifically, an object of the present invention is to reduce the number of parts required for the battery pack and simplify the assembly process to reduce the manufacturing cost of the battery, and has a stable coupling structure that can minimize the defects and changes in internal resistance due to external impact On the other hand, it is to provide a secondary battery pack that can increase the capacity of the battery compared to the same standard.

Another object of the present invention is to connect the connection member in a specific structure to enable the manufacture of the secondary battery pack as described above, accordingly a new structure of the PCM easy to combine the battery cell and PTC element to the connection member To provide.

Secondary battery pack according to the present invention for achieving this object,

A battery cell in which an electrode assembly having a cathode / separation membrane / cathode structure is sealed inside a battery case together with an electrolyte;

An opening is formed to expose the electrode terminals of the battery cell, and has a structure in which a PCM assembly is mounted on the top, and an insulating mounting member mounted on an upper surface of the battery cell;

It consists of a protection circuit module (PCM) and connecting members (A, B) coupled to the lower surface of the PCM, two or more connecting through holes are perforated, and the connecting members are connected to the circuit of the PCM. PCM assembly is coupled to the structure exposed through the through-hole for connecting the furnace;

A PTC device positioned on an electrical connection circuit between the PCM assembly and the battery cell, and having a bottom connection lead directly coupled to an upper surface of the battery case; And

An insulating cap coupled to an upper end of the battery cell while surrounding the insulating mounting member in the state where the PCM assembly is mounted;

It contains,

In the state where the insulating mounting member and the PCM assembly are mounted on the battery cell, the battery cell electrode terminal and the PTC device are electrically connected to the connection members from the top of the PCM.

That is, the secondary battery pack according to the present invention is connected to the lower surface of the PCM in a state in which the connecting members are exposed through the connection through hole, so that the connecting members are in contact with the battery cell electrode terminal and the upper surface of the PTC element. Is mounted on the insulating mounting member mounted on the top surface of the battery cell, so that welding or the like can be performed through the through-hole of the PCM, so that the assembly process of the battery pack is very simple.

In addition, the lower surface of the PTC element is directly coupled to the battery case in a non-bending state in close contact, thereby eliminating dead space caused by bending the connection member for the electrical connection of the PTC element in the prior art In the battery pack of the same standard, the battery capacity can be increased.

Since the battery case is required for ease of processing and a certain level or more of mechanical strength, the battery case may be a metal can, preferably an aluminum can or a stainless steel can.

The connection members, as defined above, are coupled to the bottom surface of the PCM in a structure exposed through the connection through-holes while being connected to the circuit of the PCM, and preferably in a form of completely sealing the connection through-holes. It may be a structure coupled to the lower surface.

The coupling of the connection members and the PCM may be made in various ways. Preferably, the connection members may be coupled to the bottom surface of the PCM by a surface mount technology (SMT) method. This SMT method is preferable because it prevents the paste from remaining on the lower surface of the PCM when soldering or the lower surface of the PCM during welding, and can be mutually coupled more accurately and reliably than conventional welding or soldering methods. For reference, SMT is widely used to mount surface-mount components on an electromagnetic board such as a printed circuit board (PCB).

In one preferred example, the connection member A may be electrically connected to a PTC element coupled on the battery case of the battery cell, and the connection member B may be electrically connected to the electrode terminal of the battery cell. have.

For example, the rectangular battery cell has a structure in which an electrode terminal and a battery case protruding from the center of the upper surface thereof are respectively a cathode and an anode terminal, and an insulating member is interposed therebetween to insulate each other. In this rectangular battery cell structure, the first electrode terminal may be a positive terminal which is an upper surface of the battery case, and the second electrode terminal may be a negative electrode terminal which protrudes from the upper surface of the battery case. In this case, the battery cell electrode terminal to which the connection member B is connected is a negative electrode terminal.

The connecting members may preferably be made of a metal plate, for example, a nickel plate. The metal plate is attached to the lower surface of the PCM in a non-bending form, and is directly coupled to the battery cell electrode terminal and the upper surface of the PTC element.

The electrical connection of the connecting members to the battery cell electrode terminal and the PTC element may be preferably achieved by welding through a through hole for connecting the PCM. Examples of the welding may include laser welding, resistance welding, and the like. .

The PTC element is a kind of safety element that energizes the current by decreasing the resistance when the temperature of the battery cell rises, the resistance greatly increases, and conversely, when the temperature decreases. The PTC element is located on the connection circuit between the battery cell and the PCM assembly, and performs the power disconnection and the energization according to the temperature of the battery cell.

The PTC device includes a PTC body in which metal foils are bonded to upper and lower surfaces of a PTC material layer made of a polymer composite having a resistance that changes with temperature, and a nickel plate, respectively, on upper and lower portions of the PTC body. It has a spherical structure in which connection leads such as these are joined by soldering or the like. Therefore, in the prior art, the electrical connection was achieved by connecting the upper nickel plate to the PCM by soldering, and bonding the lower nickel plate to the top surface of the battery case to which the nickel clad was bonded by welding. In this process, a nickel plate of a predetermined length is required to connect the PTC element and the battery cell electrode terminal (top surface of the battery case) and / or the PTC element and the PCM assembly, and inevitably bend the nickel plate. Assembly of the battery pack was performed.

On the other hand, in the present invention, since the upper surface of the PTC element is directly coupled to the connection member coupled to the lower surface of the PCM, and the lower surface of the connection lead is directly coupled to the upper surface of the battery case, the structure and coupling method completely different from the prior art. The battery pack is assembled. Here, "directly coupled" means that the connection member or the lower surface connection lead is not bent in the space in which the PTC element is located.

In one preferred embodiment, the lower surface connection lead is larger than the PTC main body and has a structure in which at least a portion of the lower surface connection lead is exposed from the upper side so that the connection surface of the PTC element to the upper surface of the battery case can be easily coupled. Can be. Therefore, when the PTC element is placed in the corresponding part of the battery case from the upper side, the connection lead can be easily coupled to the upper surface of the battery case.

Such bonding can be carried out in a variety of ways, preferably by welding or mechanical fastening. The welding may be performed by, for example, laser welding, resistance welding, or the like. The mechanical fastening, for example, to form a recessed groove for fastening on the upper surface of the battery case, bending a predetermined portion of the lower surface connection lead into a downward projecting structure corresponding to the fastening recessed groove, for fastening such downward projection It can be achieved by pressing in the indentation groove.

Various materials are available for the lower connection lead of the PTC device, and the coupling method can be selected accordingly. As a first example, the bottom connection lead is a plate-shaped metal plate, and can be coupled to the battery case by laser welding. The metal plate may be composed of, for example, nickel as a main component. As a second example, the bottom connection lead is a plate-shaped plate of a clad metal structure, and a surface of the clad metal structure contacting the battery cell mainly contains the same material as that of the battery case, and may be coupled to the battery case by an ultrasonic resistance welding method. have. The clad metal plate-shaped plate, for example, when the battery case is made of aluminum, the surface in contact with the battery case may be a nickel clad containing aluminum as a main component.

Preferably, the insulating mounting member has a size substantially coincident with the top surface of the battery cell, and includes a first opening through which an electrode terminal of the battery cell is exposed at a center and a predetermined distance from the first opening. It may have a structure in which a second opening through which the upper surface is exposed and a third opening through which the electrolyte injection portion sealed at a predetermined distance from the first opening are exposed upward.

Since the first opening and the second opening are portions where the top surface of the battery cell electrode terminal and the PTC element protrude upward, the first opening and the second opening may be formed in a planar rectangular shape. It may be formed in a planar circular shape.

In still another preferred embodiment, the insulating mounting member has protrusions protruding upward at a predetermined height at both ends in the longitudinal direction, and fastening grooves are formed at the center of the protrusions so as to improve the bonding force with the insulating cap. Fasteners may protrude from the insulating caps corresponding to the fastening grooves. Therefore, the insulating mounting member and the insulating cap can be easily coupled by a mechanical fastening structure between each other.

On the other hand, the PCM assembly is mounted on the upper surface of the insulating mounting member, so that the insulating mounting member has a side wall for protruding upward at both ends in the width direction so as to ensure a stable mounting state of the PCM assembly to the insulating mounting member. It may be made of a structure.

The coupling of the insulating mounting member to the top surface of the battery case is automatically achieved in the process of connecting the connection member of the PCM assembly mounted on the insulating mounting member to the battery cell, but the ease of battery pack assembly process and a more stable coupling state In order to ensure that, for example, it may be combined separately by a bonding (Bonding) method.

The insulative cap serves to protect the battery cell from external shocks and to maintain mechanical insulation while supplementing the mechanical strength of the members mounted on the top of the battery cell. Preferably, the insulating cap extends downwardly to a predetermined length so that at least a portion thereof may surround the outer surface of the upper end of the battery cell while being mounted on the battery cell so as to improve the bonding force to the battery cell. It may be a structure. In order to maximize this effect, the downward extension of the insulating cap is preferably a structure that is coupled to the outer surface of the upper end of the battery cell by an adhesive method or a mechanical fastening method.

In addition to the insulating cap coupled to the upper end of the battery cell may be a structure that is equipped with a separate insulating cap (lower cap) in the lower end, it may be a structure in which the outer film is attached to the outer surface of the case of the battery cell. This protects the battery cell from external shock and maintains electrical insulation. Preferably, the exterior film may be attached to the structure surrounding the downward extension of the insulating cap.

The secondary battery pack according to the present invention can be variously applied regardless of the type and appearance of the battery cell, and preferably may be applied to a battery pack including a rectangular lithium secondary battery as a battery cell.

The present invention also provides a PCM assembly mounted on a battery cell, comprising a PCM and a connection member coupled to a lower surface of the PCM, two or more connection through holes are drilled, and the connection members are connected to the PCM. Provided is a PCM assembly coupled in a structure that seals the bottom of a through hole for connection to a circuit.

In general, the PCM is mounted as a separate member and electrically connected to the upper end of the battery cell. Therefore, in order to mount such a PCM outside the battery cell, a difficult coupling process with the battery cell is performed, such as a plurality of welding or soldering operations, so that a lot of defects occur, and at the same time, problems such as space for mounting are required. Triggered.

On the contrary, since the PCM assembly according to the present invention consists of the connection members coupled to the PCM and the lower surface of the PCM in a specific form, the defective rate of the connection portion can be much reduced compared to the prior art. In addition, the connection member is made of a structure exposed to the upper portion of the PCM assembly, the connection member can be connected to the corresponding portion by welding while the PCM assembly is mounted on the battery cell, simplifying the manufacturing process of the battery pack In addition, by minimizing the size of the connection member and the size of the PCM assembly mounted on the battery cell, the overall battery capacity can be significantly increased compared to the same standard of the battery pack.

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

Referring to FIG. 1, the secondary battery pack 100 includes a battery cell 200 in which an electrode assembly is sealed in an inside of a battery case together with an electrolyte solution, and a PCM assembly 300 that effectively controls abnormal conditions such as overcharge. The PCM assembly 300 is mounted to the insulating mounting member 400, which is mounted on the top surface 210 of the battery cell 200, while the PCM assembly 300 is mounted while wrapping the insulating mounting member 400 in the battery An insulating upper cap 500 coupled to the upper end of the cell 200, an insulating lower cap 510 coupled to the lower end of the battery cell 200, and an exterior film 520 attached to surround the outer surface of the case of the battery cell 200. ) Structure.

The upper surface 210 of the battery cell 200 has a negative electrode terminal 220 protruding upward in an insulated state from the battery case, and the remaining portions except the negative electrode terminal 220 form a positive electrode terminal. The PTC element 600 is coupled to the positive electrode terminal, and the electrolyte injection portion 230 sealed by the metal ball, the polymer resin, or the like protrudes in a planar circular shape on the opposite side.

The insulating mounting member 400 is mounted on and coupled to the top surface 210 of the battery cell 200 in an adhesive manner, and the insulating mounting member is exposed so that the protruding negative electrode 220 of the battery cell 200 is exposed upward. The first opening 410 is formed in the central portion of the 400, and the second opening 420 is formed in the right portion so that the top surface of the PTC device 600 is exposed. In addition, a third opening 430 is formed at the left side to expose the sealed electrolyte injection part 230 upward.

Two connection through holes 310 and 320 are perforated in the PCM assembly 300, and connection members (not shown) are coupled to the bottom surface of the PCM assembly 300 to seal the connection through holes 310 and 320. .

The insulating upper cap 500 is coupled to the upper end of the battery cell 200 while wrapping the insulating mounting member 400 in the state where the PCM assembly 300 is mounted, so that the upper end of the battery cell 200 can be wrapped around the outer surface. It extends downward to a predetermined length, and the A / S label 502 is attached to one side of the upper surface.

An outer film 520 is attached to an outer surface of the battery case to secure an electric insulation state from the outside and display information of a product. The outer film 520 made of a heat-shrinkable material is manufactured in the form of a tube, wrapped around the battery cell 200, and then applied with heat to be adhered to the battery cell 200 case surface while being contracted.

2 is a schematic view showing a structure in which connection members are coupled to the bottom surface of the PCM assembly.

Referring to FIG. 2 together with FIG. 1, a pair of connection members 330 and 340 are coupled to the bottom surface of the PCM assembly 300 by the SMT method. The connection members 330 and 340 are coupled to the terminal connection parts 312 and 322 of the PCM assembly 300 in a form of completely sealing the lower portions of the connection through holes 310 and 320, and have a non-bended state. Keeping up. Terminal connections 312 and 322 are connected to the circuit of PCM assembly 300.

Connection through holes 310 and 320 in a state in which the connection member B 330 is in contact with the negative electrode terminal 220 of the battery cell 200 and the connection member A 340 is in contact with the top surface of the PTC element 600. Through the welding tip (not shown) is introduced to perform the welding.

Since the connection members 330 and 340 are connected to the electrode terminals of the battery cell 200 as they are not bent as shown in FIG. 2, a connection member having a smaller size than that of the related art can be used, and moreover, bending is performed in the assembling process. It does not need to be, so it does not result in dead space for bending.

3 is a schematic top view of one exemplary battery cell in the battery pack according to the present invention, and FIG. 4 is an enlarged view of a PTC device.

3 and 4, the negative electrode terminal 220 in the battery cell 200 is insulated from the upper surface 210 of the battery case, which is the positive electrode terminal, by the insulating member 222.

The PTC device 600 coupled to the battery case top surface 210 has a structure in which the bottom connection lead 610 is coupled to the PTC main body 620 by soldering. The PTC body 620 has a structure in which the PTC material layer 622 of the polymer composite whose resistance changes with temperature and the metal foil 624 are bonded to the upper and lower surfaces thereof, respectively. Therefore, in the assembly process of the battery pack, the connection member A 340 coupled to the bottom surface of the PCM (not shown) is coupled to the top surface of the PTC body 620 by welding.

The lower surface connection lead 610 has a larger size than the PTC main body 620, so that the lower surface connection lead 610 can be easily coupled to the lower surface connection lead 610 from the upper side.

In addition, the lower surface connection lead 610 may be a nickel plate or a metal plate having a nickel clad structure, and thus laser welding and resistance welding may be selectively performed.

5 and 6 illustrate exemplary processes of coupling the connection member of the PCM after coupling the PTC device to the battery cell.

First, referring to FIG. 5, the lower surface connection lead 610 of the PTC element 600 is coupled to the upper surface 210 of the battery cell 200 by welding, and the PCM 300 is moved downward to its lower surface. The coupled member 340 is positioned on the PTC device 600. Then, the connecting member 340 coupled to the lower surface of the PCM 300 is in contact with the upper surface of the PTC element 600, and a welding tip (not shown) is introduced into the connecting through hole 320 to perform welding. do.

Next, referring to FIG. 6, it is different from FIG. 5 in that the lower surface of the PTC device 600a to the top surface 210a of the battery cell 200a is achieved by a mechanical fastening structure in a coupling manner of the connection lead 610a. There is.

Specifically, a fastening recess 212 is formed in the top surface 210a of the battery cell 200a, and a downward protrusion 612 is formed in the bottom connection lead 610a. The downward protrusion 612 has a structure in which a part of the lower surface connection lead 610a is bent. Accordingly, when the PTC element 600a is pressed in the state where the PTC element 600a is placed on the top surface 210a of the battery cell 200a, the downward protrusion 612 is elastically inserted into the fastening indentation groove 212 by the interference fit method. A secure fastening is made, and at the same time an electrical connection is achieved.

FIG. 7 is a perspective view schematically showing a mounting member mounted on a battery cell in the battery pack according to FIG. 1.

Referring to FIG. 7, the insulating mounting member 400 has a size substantially coincident with the top surface of the battery cell 200, and has a first opening 410 exposing the negative electrode terminal 220 of the battery cell 200 at the center thereof. ), A second opening 420 exposing the top surface of the PTC element 600, and a third opening 430 exposing the sealed electrolyte injection part 230 are formed.

In addition, protrusions 440 protrude upwardly to a predetermined height at both ends in the longitudinal direction, and fastening grooves 442 are formed at the center of the protrusions 440, and correspondingly, an insulating upper cap (FIG. 1: 500). Fastener is formed in the), it is possible to improve the in-situ mounting and bonding force of the insulating top cap (Fig. 1: 500) to the insulating mounting member 400.

At both ends of the insulating mounting member 400 in the width direction, a storage sidewall 450 for stably mounting the PCM assembly 300 of FIG. 2 from the top protrudes upward to a predetermined height.

FIG. 8 schematically illustrates a perspective view of a structure in which the PCM assembly is mounted on the insulating mounting member in FIG. 7.

Referring to FIG. 8, when the PCM assembly 300 is mounted on the insulating mounting member 400, the negative electrode terminal (not shown) of the battery cell 200 is contacted through the connection through holes 310 and 320. The connecting member B 330 and the connecting member A 340 contacting the upper surface of the PTC element (not shown) are exposed, and a welding tip is introduced into the connecting through holes 310 and 320 in FIG. 5. Welding may be performed on the connection members 330 and 340 in the same manner.

9 is a schematic view showing a structure in which the insulating top cap 500 is coupled to the structure of FIG. 8, referring to FIG. 9, the insulating top cap 500 includes a fastening groove of an insulating mounting member (FIG. 7: 400). (FIG. 7: 442) A fastener (not shown) is formed at a position corresponding to the fastener (not shown) of the insulating top cap 500, and a fastening groove of the insulating mounting member (FIG. 7: 400). (Fig. 7: 442) to form a mechanical fastening to each other.

As described above, in the secondary battery pack according to the present invention, the connecting members are coupled to the lower surface of the PCM in a predetermined form, and the insulating mounting member and the like have a specific structure such that the connecting members are exposed to the upper portion of the PCM. Since the PTC element is directly coupled to the top surface of the battery case in a non-bending state, the number of parts and the number of work steps can be reduced, and a more compact battery pack can be manufactured. In addition, this structure can reduce the size of the upper space in which the PCM assembly is mounted in the battery pack, it is possible to increase the battery capacity compared to the same standard.

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

1 is an exploded perspective view of a rechargeable battery pack according to an embodiment of the present invention;

2 is a schematic diagram of a structure in which connection members are coupled to the bottom surface of the PCM assembly;

3 is a schematic top view of one exemplary battery cell in a battery pack according to the present invention, and FIG. 4 is an enlarged view of a PTC element therein;

5 and 6 are schematic diagrams for exemplary processes of coupling the connection member of the PCM after coupling the PTC element to the battery cell in accordance with the present invention.

7 is a perspective view of a state in which a mounting member is mounted on a battery cell in the battery pack according to FIG. 1;

FIG. 8 is a perspective view of a structure in which a PCM assembly is mounted on an insulating mounting member in FIG. 7; FIG.

FIG. 9 is a schematic diagram of a structure in which an insulating top cap is coupled to the structure of FIG. 8.

Claims (17)

A battery cell in which an electrode assembly having a cathode / separation membrane / cathode structure is sealed inside a battery case together with an electrolyte; An opening is formed to expose the electrode terminals of the battery cell, and has a structure in which a PCM assembly is mounted on the top, and an insulating mounting member mounted on an upper surface of the battery cell; It consists of a protection circuit module (PCM) and connecting members (A, B) coupled to the lower surface of the PCM, two or more connecting through holes are perforated, and the connecting members are connected to the circuit of the PCM. PCM assembly is coupled to the structure exposed through the through-hole for connecting the furnace; A PTC device positioned on an electrical connection circuit between the PCM assembly and the battery cell, and having a bottom connection lead directly coupled to an upper surface of the battery case; And An insulating cap coupled to an upper end of the battery cell while surrounding the insulating mounting member in the state where the PCM assembly is mounted; It contains, A secondary battery pack, wherein the secondary battery pack is configured to achieve electrical connection between the connection members, the battery cell electrode terminals, and the PTC device from the upper portion of the PCM while the insulating mounting member and the PCM assembly are mounted on the battery cell. The secondary battery pack as claimed in claim 1, wherein the battery case is a metal can. The secondary battery pack of claim 1, wherein the connection members are coupled to a bottom surface of the PCM by a surface mount technology (SMT) method. The method of claim 1, wherein the connection member (A) is electrically connected to a PTC element coupled on the battery case of the battery cell, the connection member (B) is electrically connected to the electrode terminal of the battery cell. Secondary battery pack. The secondary battery pack according to claim 4, wherein the battery cell electrode terminal to which the connection member (B) is connected is a negative electrode terminal. The secondary battery pack as claimed in claim 1, wherein the connection members are made of a metal plate. The secondary battery pack of claim 6, wherein the connection members are nickel plates. The secondary battery pack as claimed in claim 1, wherein electrical connection of the connection members to the battery cell electrode terminal and the PTC device is achieved by welding. The lower surface connection lead of the PTC device is larger than the PTC main body so that at least a portion of the connection lead is exposed from the upper side so as to facilitate coupling to the upper surface of the battery case. Secondary battery pack. The secondary battery pack as claimed in claim 1, wherein the lower connection lead is coupled to an upper surface of the battery case by welding or mechanical fastening. The method of claim 1, wherein the insulating mounting member has a size corresponding to the top surface of the battery cell, the first opening to expose the electrode terminal of the battery cell in the center, the PTC element at a predetermined distance from the first opening A secondary battery pack, characterized in that the second opening is exposed to the upper surface, and the third opening is exposed to the upper portion of the electrolyte injection portion sealed at a predetermined distance from the first opening. The method of claim 1, wherein the insulating mounting member is provided with protrusions protruding upward at a predetermined height at both ends in the longitudinal direction so as to improve the bonding force with the insulating cap, the fastening groove is formed in the center of the protrusions And a fastener protrudes from the insulating cap corresponding to the fastening groove. The secondary battery pack according to claim 1, wherein the coupling of the insulating mounting member to the top surface of the battery cell case is achieved by a bonding method. The secondary battery pack as claimed in claim 1, wherein the insulating cap extends downward in a predetermined length so that at least a portion thereof covers the outer surface of the upper end of the battery cell when the insulating cap is mounted on the battery cell. The secondary battery pack according to claim 1, wherein an outer film is attached to an outer surface of the case of the battery cell. The secondary battery pack as claimed in claim 1, wherein the battery cell is a rectangular lithium secondary battery. delete

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