KR101101138B1 - Secondary Battery Pack of Novel Structure - Google Patents

Abstract

The present invention is a battery cell in which the electrode assembly is sealed in the battery case together with the electrolyte, the first electrode terminal and the second electrode terminal is formed on the upper end of the battery case; A protection circuit module (PCM) consisting of a protection circuit board (PCB) and a connection terminal; An electrode terminal connecting member comprising a hollow insulating mold block and a connection part mounted on both sides of the insulating mold block, and mounted on an upper surface of the battery cell, and electrically connecting the connection terminal of the PCM and the electrode terminal of the battery cell; An insulating cap coupled to an upper end of the battery cell and having openings formed at both ends thereof; And a side cap sealing the opening of the insulating cap after completing the welding. The connection part of the electrode terminal connection member includes a connection part A having an insulator for insulation from an upper surface of a battery cell mounted on one side of an end surface thereof and extending from one side to a hollow portion of an insulating mold block, and a PTC element structure. It provides a secondary battery pack consisting of a connection portion B.

Description

Secondary Battery Pack of Novel Structures {Secondary Battery Pack of Novel Structure}

The present invention relates to a secondary battery pack having a novel structure, and more particularly, a battery cell in which the electrode assembly is sealed in the battery case together with the electrolyte; A protection circuit module (PCM) consisting of a protection circuit board and a connection terminal; An electrode terminal connecting member electrically connecting the connecting terminal of the PCM and the electrode terminal of the battery cell; An insulating cap coupled to an upper end of the battery cell and having openings formed at both ends thereof; And a side cap sealing the insulating opening; The connection part of the electrode terminal connection member includes a connection part A having an insulator for insulation from an upper surface of a battery cell mounted on one side of an end surface thereof and extending from one side to a hollow portion of an insulating mold block, and a PTC element structure. It relates to a secondary battery pack consisting of a connection portion B.

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.

Secondary batteries are classified into roughly cylindrical cells, square cells, and pouch cells according to external and internal structural features. Among them, rectangular batteries and pouch cells having a small width to length are particularly noticeable. I am getting it.

In addition, secondary batteries are attracting attention as energy sources such as electric vehicles and hybrid electric vehicles, which are proposed as a way to solve air pollution of conventional gasoline and diesel vehicles using fossil fuel. Therefore, the type of applications using the secondary battery has been very diversified due to the advantages of the secondary battery, and it is expected that the secondary battery will be applied to many fields and products in the future.

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, the lithium secondary battery is equipped with a protection circuit module (PCM) capable of effectively controlling abnormal conditions such as overcharge and the like connected to the battery cell.

In general, a PCM is composed of a structure in which a field effect transistor (FET), a voltage detector, a capacitor, and the like are coupled to a printed circuit board (PCB), and the safety devices including the PCM are electrode terminals. Maintain electrical connection with the battery while maintaining electrical insulation from other parts of the battery cell. Therefore, in order to form the connection and insulation structure as described above, welding, soldering, etc. for electrically connecting the PCM to the battery cell must be repeatedly performed, and a plurality of insulating mounting members are required. This has the disadvantage of being complicated.

In particular, when the electrode terminal connecting member is used to connect the PCM connecting terminal and the battery terminal electrode terminal, the upper surface of the battery cell may be insulated such as by attaching an insulating tape so that the upper surface of the battery cell can be kept insulated from the connecting portions of the connecting member. It goes through the process to secure it. However, since the insulation process is a process requiring delicate work in a limited space, it is difficult to automate, complicates the manufacturing process of the battery pack, and greatly reduces the manufacturing processability and productivity of the battery pack.

Therefore, research is being actively conducted on a technology capable of maintaining insulation from the top surface of the battery cell while electrically connecting the connection terminal of the PCM and the electrode terminal of the battery cell in a simple and easy manner. For example, Japanese Patent Application Laid-Open No. 2006-073457 discloses a battery element including an electrode assembly and an electrolyte in which an anode and a cathode interposed between separators are laminated, and an exterior material surrounding the battery element, and connected to the anode and the cathode, respectively. And an insulating sheet having an opening through which the tabs of the positive electrode and the negative electrode which are led to the outside of the outer cover material and the at least a portion of the outer cover material are inserted and penetrated through the tabs of the positive electrode and the negative electrode, respectively, perpendicular to the thickness direction of the battery element. Disclosed is a secondary battery pack having a protective element mounted on the surface and the insulating sheet and a circuit board mounted with the protective element.

Further, Japanese Patent Application Laid-Open No. 2004-103356 discloses a battery pack including a single cell and a circuit board using a metal case and two leads in a box, wherein the single cell has a metal case serving as an electrode terminal on one side, and the other. One electrode terminal is installed to be insulated from the metal case, and the lead of one side is connected to the metal case and the circuit board, and is installed in the metal case of the unit cell at the same time, and UV-cured between the lead and the metal case of the unit cell. A battery pack having an insulating layer made of a resin sheet is disclosed.

However, the above techniques are a technique for securing insulation between the electrode terminal portion of the battery cell and the connection portion of the circuit board using an insulating sheet and an ultraviolet curable resin sheet, and after mounting the insulating sheet on the battery exterior material and the metal case, the electrode tab or Since the process of connecting the electrode lead to the circuit board has a disadvantage of improving the manufacturing processability of the battery pack does not reach the desired level, and since the insulating sheet is formed on the outer surface, the weight and volume of the battery pack needlessly increased There is a problem.

In addition, in the process of electrically connecting the connection portion of the circuit board to the electrode terminal of the battery cell, in order to solve the problem of deterioration of the weldability of heterogeneous materials, to perform the operation of coupling the nickel clad or the like to the electrode terminal of the battery cell, Work also makes the automation of the process difficult, and also acts as a factor that lowers the manufacturing processability and productivity of the battery pack.

Therefore, there is a high need for a technology that can solve the problems of the prior art as described above and improve the manufacturing processability and productivity of the battery pack by a simple and easy assembly process.

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

Specifically, an object of the present invention is to change the structure of the various members mounted on the battery cell, to reduce the assembly process of the battery pack, to enable the automation of the process, a secondary battery pack that can greatly improve the productivity 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 the battery case together with an electrolyte solution, and the first electrode terminal and the second electrode terminal are formed on an upper end of the battery case;

A protection circuit module (PCM) including a protection circuit board (PCB) having a protection circuit formed thereon and a connection terminal mounted on a bottom surface of both sides of the PCB in a vertical cross-section with a '-' shape on both sides of the PCB;

An electrode terminal connecting member comprising a hollow insulating mold block and a connection part mounted on both sides of the insulating mold block, and mounted on an upper surface of the battery cell, and electrically connecting the connection terminal of the PCM and the electrode terminal of the battery cell;

An insulating cap which is coupled to the upper end of the battery cell while surrounding the PCM and the electrode terminal connecting member, and has openings formed at both ends of the openings for welding the side surfaces of the connecting terminal and the connecting portion from the outside; And

A side cap sealing the opening of the insulating cap after the welding is completed;

It contains,

The connecting portion of the electrode terminal connecting member has a structure in which an insulator for insulating the upper surface of the battery cell is mounted on one side of the lower surface of one end and one side thereof extends to the hollow portion of the insulating mold block, and a connecting portion B of the PTC element structure. Consists of

That is, in the secondary battery pack according to the present invention, since the insulator is mounted on the lower surface of one end of the electrode terminal connecting member, the process of attaching the insulating tape for insulation to the upper surface of the battery cell can be omitted. It can be easily implemented.

In addition, it comprises a battery cell, an electrode terminal connecting member, PCM, an insulating cap and a side cap, the opening of the insulating cap in the state that the electrode terminal connecting member, PCM, insulating cap is sequentially mounted on the battery cell top Since the PCM and the electrode terminal connecting member can be electrically connected by a simple method of welding the connecting portion of the PCM and the connecting member through the manufacturing method, the battery cell is manufactured by simplifying the assembly process of the upper part of the battery cell as compared with the conventional structure. Fairness and productivity can be greatly improved.

Furthermore, the insulator mounted on the lower surface of one end portion of the connection portion A not only prevents a short circuit due to contact between the connection portion A and the battery cell upper surface, but also when welding the side surface of the connection portion between the connection terminal and the connection portion A from the outside. As a result, a phenomenon in which a part of the connection portion A is bent or twisted can be prevented at the same time.

The electrode terminals formed on the top of the battery case may be variously applied regardless of the type and shape of the battery cell. For example, in the case of a square battery cell, the first electrode terminal protrudes from the center of the battery cell. And a negative electrode terminal inserted into a lower portion of the hollow part of the insulating mold block, and the second electrode terminal may be configured as a positive electrode terminal forming an upper surface of the battery cell case.

One end portion of the connection portion A coupled to the first electrode terminal of the battery cell and the connection portion B coupled to the second electrode terminal of the battery cell is bent upward in a '-' shape on a vertical cross section, perpendicular to both bottom surfaces of the PCB. It can be easily coupled to the connection terminal is mounted in the '' 'shape on the cross-section.

Specifically, as mentioned above, after the electrode terminal connecting member, the PCM and the insulating cap are sequentially mounted at the top of the battery cell, the connecting portion of the PCM connecting terminal and the electrode terminal connecting member overlaps through the opening of the insulating cap. The part to be joined can be easily joined by side welding. For reference, side welding means performing welding in the lateral direction.

The connection part A is not particularly limited as long as it is a material or structure capable of electrically connecting the connection terminal of the PCM and the electrode terminal of the battery cell while maintaining an insulation state with the upper end of the battery cell. For example, the connection part A is a metal plate. And, a part of the metal plate may be a structure embedded in the insulating mold block.

The connection part B further includes a function of electrically connecting the connection terminal of the PCM and the electrode terminal of the battery cell to further improve the safety of the battery pack by the structure of the PTC element. For example, the connection portion B has a structure of a PTC element including a PTC body, a PCM coupling portion coupled to an upper surface of the PTC body, and a battery cell coupling portion coupled to a lower surface of the PTC body. A part of the battery cell coupling part may be a structure embedded in the insulating mold block.

Therefore, when the temperature of the battery pack rises rapidly due to an internal short circuit or the like, the connection part B coupled with the PTC element serves to block the current flow between the battery cell and the PCM, thereby improving the safety of the battery pack.

The PTC body may have a variety of structures, for example, may be a structure formed by bonding a metal foil to the upper and lower surfaces of the PTC material layer made of a PTC polymer composite, respectively.

In one preferred embodiment, the battery cell coupling portion may be further coupled to the metal clad to facilitate coupling with the battery cell second electrode terminal on the lower surface to reduce the number of battery pack manufacturing process and to enable automation. . That is, since the metal clad is coupled to the bottom surface of the battery cell coupling portion, the operation of attaching the metal clad to the top surface of the battery cell can be omitted. Such a metal clad may be made of, for example, an aluminum-nickel alloy.

More preferably, the battery cell coupling portion itself may be a structure consisting of a metal clad structure for facilitating the coupling with the battery cell second electrode terminal.

On the other hand, in the connecting portion of the electrode terminal connecting member, the metal plate and the battery cell coupling portion may be formed integrally during the molding of the insulating mold block, for example, when formed simultaneously with the insulating mold block by the insert injection molding method, It is preferable because no additional process for mounting the metal plate and the battery cell joint to the insulating mold is necessary. Therefore, the metal plate and the battery cell coupling portion may be manufactured to have a buried structure during insert injection molding of the insulating mold block.

In some cases, an insulator may be additionally mounted at one lower end of the connection part B. For example, such an insulator has a structure in which an insulating material for insulating the upper surface and the lower surface of one end of the connection portion B is applied or a predetermined insulator is bonded to the upper surface and the lower surface of the connection part B, or the upper and lower surfaces of the one end portion are insulative tape. By constructing the structure enclosed by, the mutual insulation between the battery cell upper surface and the connection portion B can be more stably achieved.

The side cap is preferably made of a structure that is integrally connected to both ends of the insulating cap, it may be included in a structure that can be easily and easily assemble the assembly process of the top of the battery pack, preferably, The structure may be integrally connected with both ends of the insulative cap and may enable automation of the process. For example, the insulative cap and the side cap of the structure may be integrally formed during insert injection molding.

In this structure, the unitary structure of the side cap and the insulating cap may be implemented in various ways, for example, the side cap may be connected to the insulating cap in a hinge structure.

The battery case may be a metal can formed of a metal material, and preferably made of an aluminum can, because it requires processing convenience and mechanical strength of a predetermined level or more.

Coupling of the electrode terminal connecting member to the upper surface of the battery case (specifically, the coupling of the insulating mold block of the electrode terminal connecting member) in consideration of the manufacturing processability and stable mounting structure of the battery pack, for example, bonding (Bonding) Or by welding.

Meanwhile, the battery cell may be variously applied regardless of its type and appearance, and may be preferably a rectangular lithium secondary battery cell.

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

1 schematically illustrates an exploded perspective view of a rechargeable battery pack.

Referring to FIG. 1, the secondary battery pack 100 is mounted on the battery cell 200 and the upper surface of the battery cell 200 in which the electrode assembly is sealed inside the battery case together with the electrolyte solution. Is mounted on the upper surface of the electrode terminal connecting member 400, the electrode terminal connecting member 400 for electrically connecting the connection terminal 310 and the electrode terminals 220, 240 of the battery cell 200, abnormal such as overcharge The insulating top cap 500 and the battery cell 200 which are coupled to the upper end of the battery cell 200 while wrapping the electrode terminal connecting member 400 in a state where the PCM 300 and the PCM 300 effectively control the state. Insulating bottom cap 510 is coupled to the lower end of the), and consists of a structure including an outer film 520 that surrounds and attached to the outer surface of the battery cell 200 case.

The upper surface 240 of the battery cell 200 is formed with a negative electrode terminal 220 protruding upward in an insulated state from the battery case, and the remaining portion except for the negative electrode terminal 220 forms a positive electrode terminal. In addition, a metal clad 241 made of an aluminum-nickel alloy is attached to one side of the remaining portions so that the bonding force between the connection portion B 420 of the electrode terminal connecting member 400 and the positive electrode terminal portion is improved, and the electrode terminal is connected to the other side. An insulating tape 242 is attached for insulation from the member 400.

The electrode terminal connecting member 400 is mounted on the top surface 240 of the battery cell 200 by an adhesive method and is coupled to each other. The protruding negative electrode 220 of the battery cell 200 is inserted into the lower portion of the connection part B 420. The opening 430 is formed at the center portion so as to be coupled to the center.

The insulating upper cap 500 wraps the electrode terminal connecting member 400 in a state where the electrode terminal connecting member 400 and the PCM 300 are sequentially mounted on the top of the battery cell 200. It is coupled to the top, extends downward to a predetermined length so as to surround the upper outer surface of the battery cell 200, the A / S label 502 is attached to one side of the upper surface.

In addition, an opening 550 for welding the side surfaces of the connection portions 310 and 320 of the PCM 300 and the coupling portions 410 and 420 of the electrode terminal connecting member 400 from the outside may include an insulating upper cap ( It is formed at both ends of 500).

After welding the overlapping portions of the connecting terminals 310 and 320 of the PCM 300 and the connecting portions 410 and 420 of the electrode terminal connecting member 400 laterally, the side for inserting through the opening 550. Caps 600 and 610 are configured separately.

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 perspective view schematically showing an electrode terminal connecting member according to an embodiment of the present invention.

Referring to FIG. 2 together with FIG. 1, the electrode terminal connecting member 401 includes a connection portion A 410 and a connection portion B 420 mounted on both sides of the hollow insulating mold block 450 and the insulating mold block 450. ) The connection parts 410 and 420 are formed to be partially embedded in the insert injection molding of the insulating mold block 450, and one end portions 412 and 422 are bent upward in a '-' shape on a vertical section. .

A portion of the connection portion A 410 made of a metal plate is embedded in the insulating mold block 450, and an insulator 470 for insulating the upper surface of the battery cell 200 is formed at one end of the connection portion A 410. It is mounted on. The insulator 470 may be integrally formed with the insulating mold block 450 in a state of passing through a portion of the connection portion A 410.

The connection part B 420 is formed of the PTC body 4202, the PCM coupling part 4204 coupled to the top surface of the PTC body 4202, and the battery cell coupling part 4206 coupled to the bottom surface of the PTC body 4202. A portion of the battery cell coupling part 4206 is embedded in the insulating mold block 450, and the insulating member 461 surrounds one end of the connection part B 420. The insulating member 461 may also be formed to have a structure covering the upper and lower portions of the PCM coupling portion 4204.

3 is a vertical cross-sectional schematic diagram of the electrode terminal connecting member, PCM, and the top of the battery cell of Figure 2, Figure 4 is a vertical cross-sectional schematic diagram of the insulating cap according to another embodiment of the present invention.

First, referring to FIG. 3, the battery cell coupling part 4206 has a metal clad structure to facilitate coupling with the positive electrode terminal 240 of the battery cell 200.

The negative electrode terminal 220 of the battery cell 200 is inserted from the bottom into the opening 430 of the connection portion A 410 and coupled to the metal plate 460 by welding, and the positive electrode terminal 240 of the battery cell 200. Is coupled to the battery cell coupling portion 4206 of the connection portion B (420) by welding.

In addition, the PCM 300 is a vertical cross-section of the printed circuit board 340 on which the plurality of elements 330 are mounted on the protection circuit and the lower surface of both sides of the printed circuit board 340 in a state connected to the protection circuit. It consists of connecting terminals 310 and 320 that are mounted in the shape of a child.

Meanwhile, as mentioned in the foregoing description of FIG. 2, the insulators 460 and 470 for insulating the upper surface of the battery cell 200 are mounted on the lower surface of one end of the connection part A 410, and thus the connection terminal 320 is provided. When welding the side surface of the joint portion of the connection portion A 410 from the outside, the bending portion 4102 of the connection portion A 410 can be prevented from bending or twisting downward.

The other insulating member 461, the insulator 470, the PTC main body 4202, the PCM connecting portion 4204, and the like are the same as those described in FIG.

Next, referring to FIG. 4, side caps 510 integrally formed at the time of insert injection molding are connected to both ends of the insulating cap 500 in a hinge structure, and the PCM 300 is formed on the bottom surface of the insulating cap 500. Since it is integrally formed in, the number of battery pack manufacturing steps can be greatly reduced.

As described above, the secondary battery pack according to the present invention can reduce the number of battery pack assembly processes and can automate the process, thereby greatly improving the manufacturing processability and productivity of the battery pack.

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 secondary battery pack;

2 is a perspective view of an electrode terminal connecting member according to an embodiment of the present invention;

3 is a vertical cross-sectional schematic diagram of an electrode terminal connecting member, a PCM, and a battery cell in FIG. 2;

Figure 4 is a vertical cross-sectional schematic diagram of an insulating cap according to another embodiment of the present invention.

Claims (20)

A battery cell in which an electrode assembly having a cathode / separation membrane / cathode structure is sealed inside the battery case together with an electrolyte solution, and the first electrode terminal and the second electrode terminal are formed on an upper end of the battery case; A protection circuit module (PCM) including a protection circuit board (PCB) having a protection circuit formed thereon and a connection terminal mounted on a bottom surface of both sides of the PCB in a vertical cross-section with a '-' shape on both sides of the PCB; An electrode terminal connecting member comprising a hollow insulating mold block and a connection part mounted on both sides of the insulating mold block, and mounted on an upper surface of the battery cell, and electrically connecting the connection terminal of the PCM and the electrode terminal of the battery cell; An insulating cap coupled to an upper end of the battery cell while surrounding the PCM and the electrode terminal connecting member, and having openings formed at both ends of the openings for welding the side surfaces of the connecting terminal and the connecting portion from the outside; And A side cap sealing the opening of the insulating cap after the welding is completed; It contains, The connecting portion of the electrode terminal connecting member includes a connecting portion A having an insulator for insulating the upper surface of the battery cell on one side of the lower surface thereof and extending to the hollow portion of the insulating mold block, and a connecting portion B of the PTC element structure. , The secondary battery pack according to claim 1, wherein one end of the connection portion A coupled to the first electrode terminal of the battery cell and the connection portion B coupled to the second electrode terminal of the battery cell is bent upward in a '-' shape on a vertical section. The method of claim 1, wherein the first electrode terminal is a negative electrode terminal protruding in the center of the battery cell and inserted into the hollow portion of the insulating mold block, the second electrode terminal is a positive electrode terminal forming the top surface of the battery cell case A secondary battery pack characterized by the above-mentioned. delete The secondary battery pack according to claim 1, wherein the connection portion A is made of a metal plate, and a part of the metal plate is embedded in the insulating mold block. The method of claim 1, wherein the connection portion B has a structure of a PTC element including a PTC body, a PCM coupling portion coupled to an upper surface of the PTC body, and a battery cell coupling portion coupled to a lower surface of the PTC body. Part of the battery cell coupling portion of the secondary battery pack, characterized in that embedded in the insulating mold block. The secondary battery pack according to claim 5, wherein a metal clad is further coupled to a lower surface of the battery cell coupling part to facilitate coupling with the battery cell second electrode terminals. The secondary battery pack of claim 6, wherein the metal clad is made of an aluminum-nickel alloy. The secondary battery pack according to claim 5, wherein the PTC body is formed by bonding metal foils to upper and lower surfaces of the PTC material layer made of the PTC polymer composite, respectively. The method of claim 5, wherein the battery cell coupling portion of the secondary battery pack, characterized in that made of a metal clad structure for facilitating the coupling with the battery cell second electrode terminal. The secondary battery pack as claimed in claim 4, wherein the metal plate is embedded in the insert injection molding of the insulating mold block. The secondary battery pack according to claim 1, wherein an insulator is additionally mounted at one lower end of the connection part B. The secondary battery pack as claimed in claim 1, wherein the side cap is integrally connected to both ends of the insulating cap. The secondary battery pack as claimed in claim 12, wherein the side cap is connected to the insulating cap in a hinge structure. The secondary battery pack as claimed in claim 1, wherein the battery case is a metal can. The secondary battery pack according to claim 1, wherein the coupling of the electrode terminal connecting member to the top surface of the battery case is achieved by bonding or welding. The secondary battery pack as claimed in claim 1, wherein the battery cell is a rectangular lithium secondary battery cell. The secondary battery pack as claimed in claim 5, wherein a part of the battery cell coupling part is buried in the insert injection molding of the insulating mold block. A battery cell in which an electrode assembly having a cathode / separation membrane / cathode structure is sealed inside the battery case together with an electrolyte solution, and the first electrode terminal and the second electrode terminal are formed on an upper end of the battery case; A protection circuit module (PCM) including a protection circuit board (PCB) having a protection circuit formed thereon and a connection terminal mounted on a bottom surface of both sides of the PCB in a vertical cross-section with a '-' shape on both sides of the PCB; An electrode terminal connecting member comprising a hollow insulating mold block and a connection part mounted on both sides of the insulating mold block, and mounted on an upper surface of the battery cell, and electrically connecting the connection terminal of the PCM and the electrode terminal of the battery cell; An insulating cap coupled to an upper end of the battery cell while surrounding the PCM and the electrode terminal connecting member, and having openings formed at both ends of the openings for welding the side surfaces of the connecting terminal and the connecting portion from the outside; And A side cap sealing the opening of the insulating cap after the welding is completed; It contains, The connecting portion of the electrode terminal connecting member includes a connecting portion A having an insulator for insulating the upper surface of the battery cell on one side of the lower surface thereof and extending to the hollow portion of the insulating mold block, and a connecting portion B of the PTC element structure. , The connection part A is made of a metal plate, a part of the metal plate is a secondary battery pack, characterized in that embedded in the insulating mold block. A battery cell in which an electrode assembly having a cathode / separation membrane / cathode structure is sealed inside the battery case together with an electrolyte solution, and the first electrode terminal and the second electrode terminal are formed on an upper end of the battery case; A protection circuit module (PCM) including a protection circuit board (PCB) having a protection circuit formed thereon and a connection terminal mounted on a bottom surface of both sides of the PCB in a vertical cross-section with a '-' shape on both sides of the PCB; An electrode terminal connecting member comprising a hollow insulating mold block and a connection part mounted on both sides of the insulating mold block, and mounted on an upper surface of the battery cell, and electrically connecting the connection terminal of the PCM and the electrode terminal of the battery cell; An insulating cap coupled to an upper end of the battery cell while surrounding the PCM and the electrode terminal connecting member, and having openings formed at both ends of the openings for welding the side surfaces of the connecting terminal and the connecting portion from the outside; And A side cap sealing the opening of the insulating cap after the welding is completed; It contains, The connecting portion of the electrode terminal connecting member includes a connecting portion A having an insulator for insulating the upper surface of the battery cell on one side of the lower surface thereof and extending to the hollow portion of the insulating mold block, and a connecting portion B of the PTC element structure. , The connection portion B has a structure of a PTC element including a PTC body, a PCM coupling portion coupled to an upper surface of the PTC body, and a battery cell coupling portion coupled to a lower surface of the PTC body, among which battery cell coupling A part of the portion is a secondary battery pack, characterized in that embedded in the insulating mold block. A battery cell in which an electrode assembly having a cathode / separation membrane / cathode structure is sealed inside the battery case together with an electrolyte solution, and the first electrode terminal and the second electrode terminal are formed on an upper end of the battery case; A protection circuit module (PCM) including a protection circuit board (PCB) having a protection circuit formed thereon and a connection terminal mounted on a bottom surface of both sides of the PCB in a vertical cross-section with a '-' shape on both sides of the PCB; An electrode terminal connecting member comprising a hollow insulating mold block and a connection part mounted on both sides of the insulating mold block, and mounted on an upper surface of the battery cell, and electrically connecting the connection terminal of the PCM and the electrode terminal of the battery cell; An insulating cap coupled to an upper end of the battery cell while surrounding the PCM and the electrode terminal connecting member, and having openings formed at both ends of the openings for welding the side surfaces of the connecting terminal and the connecting portion from the outside; And A side cap sealing the opening of the insulating cap after the welding is completed; It contains, The connecting portion of the electrode terminal connecting member includes a connecting portion A having an insulator for insulating the upper surface of the battery cell on one side of the lower surface thereof and extending to the hollow portion of the insulating mold block, and a connecting portion B of the PTC element structure. , Secondary battery pack, characterized in that the insulator is further mounted on one side lower end of the connection portion B.

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