KR20090055791A - Secondary battery pack of compact structure - Google Patents

Abstract

A secondary battery pack is provided to simplify an assembly process of a battery pack and to improve the structural stability of the battery pack due to excellent assembly property by attaching an insulating mounting member and a protection circuit module by using protrusion type electrode terminals. A secondary battery pack comprises a battery cell(130) where an electrode assembly is accommodated with electrolyte in a battery case, and a top opening of the battery case is sealed by a top cap(120); a protection circuit module(150) where a protection circuit is formed; an insulating mounting member(140) which is mounted with a protection circuit module and is mounted on the top cap of the battery cell; and an insulating cap combined with the top of the battery cell while surrounding the insulating mounting member.

Description

Secondary Battery Pack of Compact Structure {Secondary Battery Pack of Compact Structure}

The present invention relates to a secondary battery pack having a compact structure, and more particularly, includes a battery cell, a protective circuit module, an insulating mounting member, and an insulating cap, wherein the top cap of the battery cell has at least one protrusion type. An indentation space portion which is indented downward with a predetermined depth is formed, and the insulating mounting member has a through groove (first through groove) corresponding to the protruding electrode terminal and a shape corresponding to the indentation space portion. Through grooves (second through grooves) are formed, respectively, and the through-holes for fastening communicating with the first through grooves are formed in the protection circuit module, so that the elements of the protection circuit module are introduced into the indentation space. The protruding electrode terminals are continuously inserted into and fixed in the first through hole of the insulating mounting member and the through hole for fastening the protection circuit module, thereby cutting the battery cell. It relates to a secondary battery pack comprising the combination of a sex mounting member and the protective circuit module.

Due to 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 not only various mobile devices but also 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, the lithium secondary battery contains various combustible materials, and there is a danger of overheating or explosion due to overcharging, overcurrent, other physical external impact, etc., and thus has a serious safety drawback. Therefore, the lithium secondary battery is equipped with a protection circuit module (PCM) capable of effectively controlling abnormal states such as overcharge and the like connected to the battery cells.

PCM is composed of Field Effect Transistor (FET) as a switching element that controls the energization of current, and passive elements such as voltage detector, resistor, and capacitor, and overcharge, over discharge, over current, short circuit of battery cell. By blocking the reverse voltage and the like, the battery cell is prevented from being exploded, overheated, leaked, and deteriorated in charge and discharge characteristics, and the reduction of electrical performance and physicochemical abnormal behavior are prevented, thereby eliminating risk factors and extending service life.

In general, the PCM is electrically connected to the battery cell by a welding or soldering method through a conductive nickel plate. That is, a nickel plate is welded or soldered to the connecting lead of the PCM, respectively, and then the nickel plate is welded or soldered to the electrode terminals of the battery cell to connect the PCM to the battery cell, thereby manufacturing a battery pack.

In this case, a large number of welding or soldering is required in order to configure the battery pack, and such welding, etc., must be performed in a very precise work due to the small structure of the secondary battery, and thus the likelihood of defects is high. Moreover, the addition of these operations during the manufacturing process of the product acts as a factor that increases the product cost.

On the other hand, recently, in the method of manufacturing the PCM by mounting the elements on the substrate, in order to reduce the overall volume of the battery pack using a chip on board (chip on board) technology to manufacture a very thin PCM after the battery pack The technology to mount on the top has been developed. However, since the PCM manufactured by the chip-on-board technology is more expensive than the PCM manufactured by the prior art, there is a problem of increasing the manufacturing cost of the battery pack.

Therefore, the assembly of the insulating mounting member and the safety device mounted on the top of the battery cell, while at the same time easy to use the battery pack equipped with a PCM manufactured according to the prior art so as not to increase the volume of the battery pack as a whole, Research into a variety of technologies that can effectively utilize the space of the top of the battery pack on which the PCM is mounted is being actively conducted.

In this regard, for example, Korean Patent Application Publication No. 2007-0097143 discloses an electrode assembly in which two different electrodes and a separator interposed therebetween are stacked and wound, a can containing the electrode assembly, and a A secondary battery comprising a cap assembly coupled to an open upper portion, wherein an insulating case is installed between the electrode assembly and the cap assembly, and the insulating case includes a first groove accommodating at least a portion of a downward protrusion of the cap assembly. Disclosed is a secondary battery which is formed.

However, the first groove formed in the insulating case is to prevent bending deformation of the insulating case and to minimize unnecessary space between the cap assembly and the insulating case, and facilitates the assembly of the insulating mounting member and the safety device, or the PCM. Since the devices do not provide enough space to introduce all of the elements, there is a problem that it is difficult to efficiently use the space on the top of the battery pack. In addition, since a safety device such as PCM must be connected to the electrode terminal of the battery cell by welding or soldering, it does not solve the problem of complicated battery pack assembly process.

Therefore, the assembly process can be simplified by reducing the number of members mounted on the top of the battery cell, and the protective circuit module and the insulating mounting member are connected in a non-welding manner and relatively thick without increasing the thickness of the battery pack. There is a high need for a technology capable of mounting a safety device such as a protection circuit module on the top of a battery pack.

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.

After extensive research and various experiments, the inventors of the present application form an indentation space portion in a top cap of a battery cell, and combine a protective circuit module and an insulating cap mounted at an upper end thereof with a specific type of fastening structure. The secondary battery pack of this structure can greatly simplify the assembly process, provide excellent structural stability by improved bonding strength, and can effectively use the space on the top of the battery pack. Confirmed.

Accordingly, it is an object of the present invention to provide a secondary battery pack in which a battery cell, a protection circuit module at an upper end of a battery cell, and an insulating mounting member are coupled through a specific fastening structure while efficiently utilizing the space at the top of the battery pack.

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

A battery cell in which an electrode assembly is embedded in a battery case together with an electrolyte, and an open upper end of the battery case is sealed by a top cap;

A protection circuit module having a protection circuit for controlling overcharge, overdischarge, and overcurrent of the battery cell;

The protective circuit module is configured to be mounted on the top, the insulating mounting member mounted to the top cap of the battery cell; And

An insulating cap coupled to an upper end of the battery cell while surrounding the insulating mounting member in a state in which the protection circuit module is mounted;

It contains,

At least one protruding electrode terminal (a first protruding electrode terminal and a second protruding electrode terminal) is formed on the top cap,

In a portion where the protruding electrode terminals are not formed in the top cap, a space portion (indentation space portion) indented downward to a predetermined depth is formed so that elements mounted on the lower surface of the protective circuit module can be introduced. It is

The insulating mounting member is provided with a through groove (first through groove) corresponding to the protruding electrode terminal and a through groove (second through groove) having a shape corresponding to the indentation space, respectively.

The protective circuit module has a fastening through hole for communicating with the first through groove is formed,

With the elements of the protection circuit module introduced into the indentation space, the protruding electrode terminals are continuously inserted into and fixed in the first through hole of the insulating mounting member and the through hole for fastening the protection circuit module, thereby providing Consists of a combination of the insulating mounting member and the protective circuit module.

That is, the secondary battery pack according to the present invention comprises a battery cell, a protective circuit module, an insulating mounting member and an insulating cap, and the combination of the insulating mounting member and the protective circuit module for the battery cell is formed in the top cap. Since the protruding electrode terminals are continuously inserted into and fixed in the first through holes of the insulating mounting member and the through holes for fastening the protection circuit module, the assembly process can be performed by a simple coupling method as a whole.

In addition, the top cap is provided with a space portion (indentation space portion) that is indented downward to a predetermined depth, it is possible to ensure a space that can be introduced by a large number of elements mounted on the lower surface of the protection circuit module, A compact secondary battery pack can be manufactured.

Furthermore, since the structure of the insulating mounting member and the protective circuit module is formed to facilitate the firm mechanical fastening between the secondary battery packs according to the present invention, the secondary battery pack structure requires a plurality of welding or soldering and the like. In comparison, it simplifies the manufacturing process and provides a very stable coupling structure against external shock, vibration, and the like.

The battery case may be a metal can, and preferably an aluminum can, because it requires easy processing and a certain level of mechanical strength.

The shape of the indentation space formed in the top cap may vary, and is not particularly limited as long as it is a space in which elements mounted on the lower surface of the protection circuit module can be introduced. As an example, the indentation space may have a planar rectangular shape and four corners having a rounding treatment. The indentation space having such a shape is preferable because the elements mounted on the lower surface of the protective circuit module can be introduced as easily as possible without being in contact with the electrode assembly positioned under the top cap.

In one preferred example, the indentation space portion may have a structure in which a part of the top cap is plastically deformed to a predetermined depth. For example, in the manufacturing process of the top cap, the indentation space portion may be formed by deep drawing to be indented downward with a predetermined depth.

Specifically, the depth of the indentation space portion is formed in 0.1 to 1.0 mm so as to have a space for mounting a plurality of elements mounted on the lower surface of the protective circuit module, without contacting the electrode assembly inside the battery cell It is preferred, and more preferably may be made of a depth of 0.3 to 0.6 mm.

In another preferred example, the indentation space portion, the bottom portion of the through-hole formed by the corresponding portion of the top cap is bent downward to a predetermined depth, may be made of a structure in which the sealing plate-like member is formed.

In this structure, the depth of the indentation space can be adjusted as necessary, so that the elements of the high protection circuit module can be easily introduced into the indentation space. The joining of the bottom face of the downwardly bent through-hole and the sealing plate-shaped member can be preferably achieved by welding. Therefore, the depth of the indentation space portion may be formed, for example, 0.5 to 2.0 mm in a range where the sealing plate-shaped member is not in contact with the electrode assembly, preferably made of a depth of 0.6 to 1.5 mm.

Meanwhile, the method of fixing the protruding electrode terminal into the first through hole of the insulating mounting member and the through hole for fastening the protective circuit module may be fixed. The method of fixing the protruding electrode terminal may improve the coupling force between the electrode terminal and the protective circuit module. There is no particular limitation as long as it can make an electrical connection therebetween.

In one preferred example, the end of the protruding electrode terminal may be fixed to the protective circuit module by rolling it in a state protruding to a predetermined length on the upper surface of the protective circuit module.

For example, when the protruding electrode terminal is made of a conductive rivet, a pair of conductive rivets are formed in the top cap in a structure that is connected to the anode and the cathode of the electrode assembly, respectively, and then the first through hole of the insulating mounting member. Insulated mounting member for the battery cell and the protection circuit by a series of simple processes of successively inserting into the through grooves for fastening the protection circuit module and rolling the end of the electrode terminal protruding from the upper surface of the protection circuit module. The coupling of the module and the electrical connection of the protective circuit module and the electrode terminals can be simultaneously achieved. Rolling of the protruding electrode terminal ends further improves the bonding force between the insulating mounting member and the protection circuit module to the battery cell.

As another example, after the protruding electrode terminal is inserted into the first through hole of the insulating mounting member and the through hole for fastening of the protective circuit module, an end thereof protrudes to a predetermined length on the upper surface of the protective circuit module. The end portion may be a structure fixed to the protection circuit module by a mechanical fastening method. The mechanical fastening method of the protective circuit module to the protruding electrode terminal end may vary, and in one preferred example, the fastening method by the female screw structure and the male screw structure may be mentioned.

On the other hand, the protruding electrode terminals may serve to additionally facilitate the manufacture of the battery cell and simplify the structure, in addition to the role of fixing the protective circuit module and the insulating mounting member to the top of the battery cell. It may be made of a structure.

For example, at least one of the protruding electrode terminals has a hollow structure including a through passage communicating with the inside of the battery case, and the through passage is provided with an electrode assembly in the battery case during the battery cell manufacturing process, and then the electrolyte solution. It can be used as an electrolyte injection hole for injecting.

That is, since the protruding electrode terminal itself is utilized as the electrolyte injection hole, it is not necessary to form a separate electrolyte injection hole on the top cap as in the conventional battery cell. Therefore, the through passage may be used as an electrolyte injection hole, for example, and may have a structure sealed by a metal ball.

In addition, in the structure in which the end of the protruding electrode terminal is fixed to the protective circuit module by mechanical fastening, for example, an end of the protruding electrode terminal is formed with a screw line, and the end protrudes to the upper surface of the protective circuit module. It may be made of a structure to form a mechanical fastening by coupling the nut in the state.

The protruding electrode terminals 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 protruding electrode terminal may be electrically connected to the top cap. The second protruding electrode terminal may be connected to the positive electrode, and may be connected to the negative electrode of the battery cell in an electrically insulated state from the top cap. Accordingly, the first protruding electrode terminal may serve as a positive electrode terminal, and the second protruding electrode terminal may serve as a negative electrode terminal.

As one example of the structure, the top cap is formed with a through hole, the first protruding electrode terminal is formed integrally with the top cap, and the second protruding electrode terminal is a plate-shaped body, And an upper extension extending vertically to the upper portion of the main body, and a lower extension inserted into the through hole of the top cap and vertically extending downward to the lower portion of the main body. It may be made of a structure for coupling to the top cap.

For example, when the first protruding electrode terminal is an electrical anode, the first protruding electrode terminal formed integrally with the top cap may be formed simultaneously with the top cap in a process of press forming the top cap. However, of course, the first protruding electrode terminal prepared separately may be formed by coupling to the top cap. For example, the first protruding electrode terminal may be coupled to the top cap by welding. However, in consideration of manufacturing processability and the like, a method of forming the protruding electrode terminal by the former press molding is more preferable.

In addition, when the second protruding electrode terminal is electrically negative, the coupling structure of the top cap and the second protruding electrode terminal as described above makes it easier and more stable to couple the second protruding electrode terminal to the top cap. The upper extension portion and the lower extension portion of the second protruding electrode terminal may maintain the coupling of the protective circuit module and the insulating mounting member to the battery cell more firmly and stably.

Meanwhile, in the structure in which the second protruding electrode terminal is electrically negative, for example, the interface between the second protruding terminal and the through hole of the top cap may be insulated from the top cap of the anode. It may have a structure in which an electrically insulating gasket for mutual insulation is mounted.

The protruding electrode terminals are easily electrically connected to the protection circuit module, and the indentation space portion is not particularly limited as long as the structure can effectively mount the elements of the protection circuit module. Preferably, the protruding electrode terminals have a top cap. Is formed on both sides of the, the indentation space portion may be made of a structure formed in the space between the protruding electrode terminals.

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 may be variously applied regardless of the type and shape of the battery cell, and preferably, a so-called rectangular battery in which an electrode assembly of a cathode / separator / cathode is embedded in a rectangular metal can. .

The present invention also provides a battery cell, wherein the electrode assembly is embedded in the battery case together with the electrolyte, and the open top of the battery case is sealed by a top cap; A protection circuit module having a protection circuit for controlling overcharge, overdischarge, and overcurrent of the battery cell; An insulating mounting member having a structure in which a protection circuit module is mounted on the upper portion and mounted to a top cap of a battery cell; And an insulating cap coupled to an upper end of the battery cell while surrounding the insulating mounting member in a state in which the protective circuit module is mounted, wherein the top cap allows the elements mounted on the lower surface of the protective circuit module to be introduced. And a downwardly indented space portion (indented space portion) is formed, and the indented space portion is formed by coupling a sealing plate-shaped member to a lower end surface of a through hole formed by a corresponding portion of the top cap being bent downward to a predetermined depth. It provides a secondary battery pack.

That is, the secondary battery pack is composed of a battery cell, a protection circuit module, an insulating mounting member, and an insulating cap whose upper end is sealed by a top cap, and a corresponding portion of the top cap is bent downward to a predetermined depth in the top cap. An indentation space portion in which the sealing plate-shaped member is coupled is formed on the bottom surface of the formed through hole, so that elements mounted on the lower surface of the protection circuit module can be easily mounted in the indentation space portion.

In addition, since the indentation space portion can adjust the downward bending depth of the top cap as needed as described above, it is easy to introduce the elements of the high protection circuit module, without increasing the overall size of the battery pack A compact secondary battery pack can be manufactured.

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 is an exploded perspective view of a rechargeable battery pack according to an exemplary embodiment of the present invention, and FIG. 2 is a partial schematic view of an enlarged top cap portion of the battery cell of FIG. 1.

Referring to these drawings, the secondary battery pack 100 according to the present invention includes a battery cell 130 in which an electrode assembly is embedded in a battery case together with an electrolyte, and a top cap 120 sealing an open upper end of the battery case. Insulating mounting in a state where the protective circuit module 150 of the plate-shaped protective circuit module 150, the insulating mounting member 140 mounted on the top cap 120 of the battery cell 130, the protective circuit module 150 is mounted The insulating cap 160 is coupled to the upper end of the battery cell 130 while surrounding the member 140, and the lower cap 170 is mounted on the lower end of the battery cell 130.

The pair of protruding terminals 112 and 114 includes a first protruding electrode terminal 112 and a second protruding electrode terminal 114 protruding upward in both directions of the upper end of the top cap 120. . In addition, an indentation space indented downward to a predetermined depth so that elements mounted on the lower surface of the protection circuit module 150 can be introduced between the pair of protruding terminals 112 and 114 of the top cap 120. The part 122 is formed.

The insulating mounting member 140 has a shape corresponding to the first through holes 142 and 144 having the shape and size corresponding to the lower ends of the protruding electrode terminals 112 and 114 and the indentation space 122. 2 through grooves 146 are formed, and the fastening through grooves 152 and 154 formed in the shape and size corresponding to the upper ends of the protruding electrode terminals 112 and 114 are formed in the protection circuit module 150. It is.

The first protruding terminal 112 is connected to the positive electrode (not shown) of the battery cell 130 in an electrically connected state with the top cap 120, and the second protruding terminal 114 is the top cap 120. It is connected to the negative electrode (not shown) of the battery cell 130 in an electrically insulated state.

The combination of the insulating mounting member 140 and the protection circuit module 150 with respect to the battery cell 130 is the first having the protruding electrode terminals 112 and 114 formed at both sides of the insulating mounting member 140. After inserting the through grooves 142 and 144 and the fastening through grooves 152 and 154 formed at both sides of the protection circuit module 150, the ends of the protruding electrode terminals 112 and 114 are inserted. By rolling. In addition, the coupling of the insulating mounting member 140 to the top cap 120 may be made more firm by the adhesive as needed.

The insulating cap 160 is coupled to the upper end of the battery cell 130 while wrapping the insulating mounting member 140 in the state in which the protective circuit module 150 is mounted, so as to surround the outer surface of the upper end of the battery cell 130. It extends downward to a predetermined length. The lower cap 170 is attached to the lower end of the battery cell 150.

3 is a schematic vertical cross-sectional view showing an upper portion of the assembled state of the secondary battery pack of FIG. 1.

Referring to FIG. 3 together with FIG. 1, a top cap 120, an insulating mounting member 140, and a protection circuit module 150 are sequentially mounted on an upper portion of the battery cell 130, and a protection circuit module 150 is provided. The elements 156 mounted on the bottom surface of the top surface 120 are introduced into the indentation space 122 that is indented downward from the top surface of the top cap 120 to a predetermined depth d. Therefore, the height of the battery pack is reduced as the elements 156 of the protection circuit module 150 are introduced into the indentation space portion 122 of the top cap 120, the battery pack of the same standard by the reduction of dead space By increasing the size of the battery cell 130, it is possible to increase the battery capacity by that. The indentation space 122 may be formed by deep drawing, for example, when manufacturing the top cap 120 by press molding.

4 is a schematic vertical cross-sectional view showing an upper portion of the rechargeable battery pack in which the indentation space is deformed in FIG. 3.

Referring to FIG. 4, the indentation space 222 may be provided at a lower end surface of the through hole 224 and the through hole 224 where a portion of the top cap 220 is bent downward to a predetermined depth D. It is formed by the sealing plate-shaped member 226 joined by the welding method. Indentation space 222 of this structure can be formed relatively deep compared to the indentation space 122 of FIG. 3, in particular, due to the limitation of the deep drawing for the top cap 220 to form a deep indentation shape Particularly preferred when not possible.

5 is an enlarged partial schematic view of the top cap portion of the battery cell according to another embodiment of the present invention.

Referring to FIG. 5, a negative electrode terminal 312 protrudes upward in the top cap 320 mounted on the top surface of the battery cell 330, and a protective circuit module (1) at one side of the top cap 320. An indentation space 322 which is indented downward to a predetermined depth is formed so that the elements mounted on the lower surface of the bottom surface of the drawing (not shown) can be introduced.

6 and 7 are vertical cross-sectional schematic diagrams showing the upper shape of the battery pack that can be considered in the battery cell structure of FIG.

First, referring to FIG. 6, a negative electrode terminal 312 protrudes upward in a central portion of an upper surface of a battery cell 330, and an upper portion of the negative electrode terminal 312 is protected by a nickel plate 352. 350 is electrically connected. In addition, the elements 356 mounted on the bottom surface of the protection circuit module 350 are introduced into the indentation space 322 which is indented downward from the top surface of the top cap 320 to a predetermined depth d.

Referring to FIG. 7, the indentation space 422 is a sealing plate-like member 426 on the bottom surface of the through hole 424 formed by bending downward from the top surface of the top cap 420 to a predetermined depth D. Are coupled to each other by a welding method, and elements 456 mounted on the lower surface of the protection circuit module 450 are introduced into the indentation space 422.

Compared to the indentation space 322 of FIG. 6, the indentation space 422 of FIG. 7 is more efficiently deep in the space of the top cap 320 defined by the negative electrode terminal 312 located at the center. There is an advantage in that the indentation shape can be formed, and accordingly, a large element 356 can be introduced into the indentation space 422.

8 and 9 are vertical cross-sectional schematic diagrams of exemplary first protruding electrode terminals that can be used in the battery pack according to the present invention.

Referring to these drawings together with FIG. 1, the first protruding electrode terminal 112a of FIG. 8 is a conductive rivet and includes a plate head 1122 and a body 1124 extending perpendicular to the head 1122. In addition, the thread 1125 is formed on the outer peripheral surface of the end portion of the body 1124, so that the first through holes 142 and 144 of the insulating mounting member 140 and the fastening through holes 152 of the protection circuit module 150 are formed. After being inserted in succession 154, the thread 1125 at the end is mechanically engaged with the nut (not shown).

In the first protruding electrode terminal 112b of FIG. 9, the lower end of the head 1122 is integrally formed with the top cap 120 ′, thereby reducing the number of parts when manufacturing a battery pack, and the head 1122 and A through passage 1121 is formed at the central portion of the body 1124 and may be used as an electrolyte injection hole. The first protruding electrode terminal 112 'integrated with the top cap 120' may be formed at the same time, for example, when the top cap 120 'is press-molded.

10 is a vertical cross-sectional schematic diagram of an exemplary second protruding electrode terminal that can be used in the battery pack according to the present invention.

Referring to FIG. 10, the second protruding electrode terminal 114 ′ includes a plate-shaped body 1142, an upper extension 1144 extending vertically to the top of the body 1142, and a top cap (FIG. 11: 120). And a lower extension 1146 inserted into the through hole (Fig. 11: 126) and extending vertically to the lower part of the main body 1142.

In addition, recessed grooves 1143 and 1145 are formed at each end of the upper extension portion 1144 and the lower extension portion 1146, thereby facilitating the rolling of the edge portion.

11 is a vertical cross-sectional view showing an upper portion of a secondary battery pack according to an embodiment of the present invention. For convenience of understanding, FIG. 11 is shown as a state before rolling the protruding electrode terminals.

Referring to FIG. 11, an insulating mounting member 140 ′ and a protection circuit module 150 are formed on a top cap 120 ′ integrally formed with a first protruding electrode terminal 112 b on a secondary battery pack (not shown). ') Are mounted sequentially.

As described above, the first protruding electrode terminal 112b has a through hole 1121 for injecting an electrolyte solution in the central portion thereof, and is integrally formed with the top cap 120 '.

On the other hand, the second protruding electrode terminal 114 ′ has its lower extension 1146 inserted and mounted from the top into the through hole 126 of the top cap 120 ′, and the second protruding electrode terminal 114 ′. An electrically insulating gasket 124 is mounted at the interface between the 114 'and the top cap 120' for mutual insulation. In addition, indentations 1143 and 1145 are formed at ends of the upper extension 1144 and the lower extension 1146 of the second protruding electrode terminal 114 ′, respectively.

Accordingly, when the protruding ends of the first protruding electrode terminal 112b and the second protruding electrode terminal 114 'are rolled, respectively, the mounting member 140' and the protection circuit module 150 on the top cap 120 '. ') Is firmly combined.

In addition, elements 156 'mounted on the bottom surface of the protection circuit module 150' on the top cap 120 'in the space between the first protruding electrode terminal 112b and the second protruding electrode terminal 114'. ), An indentation space portion 122 'is formed. Therefore, the overall height of the mounting member 140 'and the protection circuit module 150' mounted on the top cap 120 'may be greatly reduced.

As described above, the secondary battery pack according to the present invention has a structure in which an insulating mounting member and a protection circuit module at the top of the battery pack are combined by using the protruding electrode terminals having a specific structure, thereby greatly simplifying the battery pack assembly process. It is possible to improve, and the structural stability of the battery pack can be improved by excellent bonding.

In addition, since the elements mounted on the lower surface of the protection circuit module can be introduced into the indentation space recessed downward in a predetermined depth in the top cap, a compact secondary battery pack having a higher capacity than a battery pack of the same size can be manufactured. have.

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 according to an embodiment of the present invention;

2 is an enlarged partial schematic view of the top cap portion of the battery cell of Figure 1;

3 is a schematic vertical cross-sectional view showing an upper portion of the assembled state of the secondary battery pack of FIG. 1;

4 is a vertical cross-sectional schematic diagram showing an upper portion of a rechargeable battery pack in which an indentation space is deformed in FIG. 3;

5 is an enlarged partial schematic view of a top cap portion of a battery cell according to another embodiment of the present invention;

6 and 7 are vertical cross-sectional schematic diagrams showing the upper shape of a battery pack that can be considered in the battery cell structure of FIG.

8 and 9 are vertical cross-sectional schematic diagrams of exemplary first protruding electrode terminals that can be used in the battery pack according to the present invention;

10 is a vertical sectional schematic view of an exemplary second protruding electrode terminal that can be used in the battery pack according to the present invention;

11 is a vertical cross-sectional view showing an upper portion of a secondary battery pack according to an embodiment of the present invention.

Claims (19)

A battery cell in which an electrode assembly is embedded in a battery case together with an electrolyte, and an open upper end of the battery case is sealed by a top cap; A protection circuit module having a protection circuit for controlling overcharge, overdischarge, and overcurrent of the battery cell; An insulating mounting member having a structure in which a protection circuit module is mounted on the upper portion and mounted to a top cap of a battery cell; And An insulating cap coupled to an upper end of the battery cell while surrounding the insulating mounting member in a state in which the protection circuit module is mounted; It contains, At least one protruding electrode terminal (a first protruding electrode terminal and a second protruding electrode terminal) is formed on the top cap, In a portion where the protruding electrode terminals are not formed in the top cap, a space portion (indentation space portion) indented downward to a predetermined depth is formed so that elements mounted on the lower surface of the protective circuit module can be introduced. It is The insulating mounting member is provided with a through groove (first through groove) corresponding to the protruding electrode terminal and a through groove (second through groove) having a shape corresponding to the indentation space, respectively. The protective circuit module is formed with a fastening groove for communicating with the first through groove, With the elements of the protection circuit module introduced into the indentation space, the protruding electrode terminals are continuously inserted into and fixed in the first through hole of the insulating mounting member and the through hole for fastening the protection circuit module, thereby providing Secondary battery pack, characterized in that the combination of the insulating mounting member and the protective circuit module. 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 indentation space portion has a planar rectangular shape and four corners are rounded. The secondary battery pack of claim 1, wherein a part of the top cap is plastically deformed to a predetermined depth. The secondary battery pack of claim 4, wherein a depth of the indentation space is 0.1 to 1.0 mm. The secondary battery pack of claim 4, wherein a depth of the indentation space is 0.3 to 0.6 mm. The secondary battery pack according to claim 1, wherein the indentation space portion is formed by coupling a sealing plate-shaped member to a lower end surface of a through hole formed by bending a corresponding portion of the top cap downward to a predetermined depth. 8. The secondary battery pack as claimed in claim 7, wherein a depth of the indentation space is 0.5 to 2.0 mm. The secondary battery pack as claimed in claim 7, wherein the indentation space has a depth of 0.6 to 1.5 mm. The secondary battery pack according to claim 1, wherein an end of the protruding electrode terminal is rolled in a state protruding to a predetermined length on an upper surface of the protective circuit module and fixed to the protective circuit module. The secondary battery pack of claim 1, wherein an end of the protruding electrode terminal protrudes a predetermined length on an upper surface of the protection circuit module, and the end is fixed to the protection circuit module by a mechanical fastening method. . The method according to claim 10 or 11, wherein at least one of the protruding electrode terminals has a hollow structure including a through passage communicating with the inside of the battery case, wherein the through passage is used as an electrolyte injection hole, Secondary battery pack, characterized in that sealed by. 12. The secondary battery pack as claimed in claim 11, wherein a screw line is formed at an end of the protruding electrode terminal, and a mechanical coupling is performed by coupling a nut in a state where the end protrudes to an upper surface of the protective circuit module. The battery cell of claim 1, wherein the first protruding electrode terminal is connected to the positive electrode of the battery cell in an electrically connected state with the top cap, and the second protruding electrode terminal is electrically insulated from the top cap. Secondary battery pack, characterized in that connected to the negative electrode. The method of claim 14, wherein the top cap is formed with a through hole, The first protruding electrode terminal is formed integrally with the top cap, The second protruding electrode terminal includes a plate-shaped main body, an upper extension vertically extending upwardly to the upper portion of the main body, and a lower extension portion inserted into the through hole of the top cap and vertically extending downwardly to the lower portion of the main body. Rolling the end of the extension portion of the secondary battery pack, characterized in that for coupling the second protruding electrode terminal to the top cap. 16. The secondary battery pack as claimed in claim 15, wherein an electrically insulating gasket is installed at an interface between the second protruding electrode terminal and the through hole of the top cap. The secondary battery pack of claim 1, wherein the protruding electrode terminals are formed at both sides of the top cap, and the indentation space is formed in a space between the protruding electrode terminals. The secondary battery pack as claimed in claim 1, wherein the battery cell is a rectangular lithium secondary battery cell. A battery cell in which an electrode assembly is embedded in a battery case together with an electrolyte, and an open upper end of the battery case is sealed by a top cap; A protection circuit module having a protection circuit for controlling overcharge, overdischarge, and overcurrent of the battery cell; An insulating mounting member having a structure in which a protection circuit module is mounted on the upper portion and mounted to a top cap of a battery cell; And An insulating cap coupled to an upper end of the battery cell while surrounding the insulating mounting member in a state in which the protection circuit module is mounted; It contains, In the top cap, a space portion (indentation space portion) which is recessed downward is formed so that elements mounted on the lower surface of the protection circuit module can be introduced, The indentation space portion, the secondary battery pack, characterized in that the sealing plate-like member is formed on the bottom surface of the through-hole formed by the corresponding portion of the top cap is bent downward to a predetermined depth.

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