KR101017911B1 - Secondary Battery Pack of Excellent Productivity - Google Patents

Abstract

The present invention is an electrode assembly is a battery cell that is embedded in a battery case with an electrolyte, a protective circuit module including a protection circuit for controlling overcharge, over-discharge, overcurrent of the battery cell, the insulating mounting mounted on the top cap of the battery cell And an insulating cap coupled to an upper end of the battery cell, wherein at least one fastener protrudes upward from an upper surface of the insulating mounting member, and a fastening corresponding to the protruding fastener to the insulating cap. The groove is formed, the fastener is inserted into the fastening groove of the insulating cap and coupled in a mechanical fastening method in the process of mounting the insulating cap on the insulating mounting member mounted on the battery cell, the insulating cap for the insulating mounting member Provides a secondary battery pack having a structure of combining.

Description

Secondary Battery Pack of Excellent Manufacturing Process {Secondary Battery Pack of Excellent Productivity}

The present invention relates to a secondary battery pack having excellent manufacturing process, and more particularly, to a battery cell, a protective circuit module, an insulating mounting member on which a protective circuit module is mounted, and an insulating cap. At least one fastener protruding upward is formed on an upper surface of the upper surface of the insulating cap, and a fastening groove corresponding to the fastener is formed on the insulating cap, and the insulating cap is mounted on the insulating mounting member mounted on the battery cell. In the process of the fastener is inserted into the fastening groove of the insulating cap is coupled to the mechanical fastening method, and relates to a secondary battery pack having a structure in which the insulating cap is coupled to the insulating mounting member.

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 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.

In addition, safety devices including PCM must maintain electrical connection with the electrode terminals while maintaining electrical insulation from other parts of the battery cell. Therefore, in order to configure such a connection form, a plurality of insulating mounting members are required, which has a disadvantage in that the assembly process of the battery cell is complicated. On the other hand, various methods have been proposed in connection with the coupling between the safety element and the insulating mounting member, this coupling method has a disadvantage of weakening the strength of the battery cell. Such a weakening of the bond strength, when a physical shock is applied to the battery cell, may cause an electrical short, etc., may cause a safety problem such as fire and explosion.

Accordingly, there is a high need for a technology capable of simplifying the assembly process by reducing the number of members mounted on the top of the battery cell and at the same time securing stable mechanical bonding strength of the insulating mounting member and the insulating cap.

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.

After extensive research and various experiments, the inventors of the present application develop a secondary battery pack combining a top cap of a battery cell, a protection circuit module and an insulating cap mounted at an upper end thereof by a specific type of mechanical fastening structure. It was found that the secondary battery pack of this structure can greatly simplify the assembly process, and provide excellent structural stability by improved bonding strength.

Accordingly, an object of the present invention is to provide a secondary battery pack in which a battery cell, a protection circuit module on the top of the battery cell, and an insulating mounting member are coupled through a specific mechanical fastening structure.

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 including 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 fastener protrudes upward from an upper surface of the insulating mounting member, and a fastening groove corresponding to the protruding fastener is formed in the insulating cap.

In the process of mounting the insulating cap on the insulating mounting member mounted on the battery cell, the fastener is inserted into the fastening groove of the insulating cap is coupled in a mechanical fastening structure, the structure of the coupling of the insulating cap to the insulating mounting member is achieved Consists of

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 coupling of the insulating cap to the insulating mounting member is a fastener on the insulating mounting member. Since it is achieved by inserting into the fastening groove of the mechanically, the assembly process can be performed in a simple coupling manner as a whole.

In addition, the secondary battery pack according to the present invention, since the structure of the insulating mounting member and the protective circuit module is formed to facilitate the mutual mechanical fastening, it simplifies the manufacturing process compared to the structure of the conventional secondary battery pack, the external impact, It provides a very stable coupling structure against vibration.

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, and preferably, an aluminum can.

The insulating mounting member is not particularly limited as long as it is a material having a top cap and insulation, and may be made of, for example, a polymer resin having both elasticity and mechanical rigidity. Among them, a thermoplastic resin such as polyethylene or polypropylene may be preferably used as a material of the insulating mounting member.

The fastener may be formed on the insulating mounting member in a structure that is elastically deformed and coupled in the process of inserting into the fastening groove of the insulating cap. That is, the fasteners formed on the upper surface of the insulating mounting member are elastically deformed and inserted into the fastening grooves of the insulating cap, and the ends of the fasteners are elastically restored, so that the coupling between the insulating cap and the insulating mounting member can be easily achieved. .

In the above structure, the fastener and the fastening groove may be formed in a variety of structures that are elastically coupled to each other to form a fixed, in one preferred embodiment, the fastening groove is in the shape of a slit, the fastener may be formed in a wedge shape.

As one specific example, the insulating cap is formed with a fastening groove made of a slit structure having a length-to-width length, and has a long width-to-width in a horizontal cross section and a wedge shape in a vertical cross-section in response to the shape of the fastening groove. The fastener made up protrudes on the insulating mounting member, and when the wedge-shaped fastener is inserted into the slit-shaped fastening groove, the end of the fastener is elastically restored to its original shape by the wedge structure, thereby easily achieving mutual coupling. can do.

In another preferred example, the fastener and the fastening groove are the same in the horizontal cross-sectional shape, and when the twist fastener is inserted into the fastening groove so that the horizontal cross-sectional shape coincide with each other, the fastener is elastically restored to the coupling groove It may be made of a structure.

As a specific example of such a structure, a fastening protrusion extending in a radial structure from a central axis on a horizontal cross section is formed in the fastener, and the fastening groove may be formed in a structure penetrated corresponding to the horizontal cross-sectional shape of the fastener. .

In this case, the fastening protrusion and the fastening groove are positioned in a structure shifted at a predetermined angle in the step before insertion, and are inserted into the fastening groove while twisting the fastening protrusion of the fastener. After insertion, the fastener may be made of a stable structure that prevents the fastener and the fastening grooves from being mutually detached by being fastened to the original shape and fixed to the fastening groove by the twisted fastening projection.

The horizontal cross-sectional shape of the fastener and the fastening groove for forming the elastic fastening structure as described above is not particularly limited, and for example, may be formed in a '+' shape, '1' shape, or 'Y' shape.

In addition, the fastener may be made of an upward tapered structure of the mushroom shape on the vertical cross section so that it can be easily inserted from the bottom into the fastening groove. That is, by the structure as described above, in the process of inserting the fastener into the fastening groove, the fastener can be elastically deformed while twisting from the original shape into the shape of the fastening groove, and in the state that the insertion is completed as described above It will be restored to the shape of.

On the other hand, the upper surface of the insulating cap has a predetermined depth at least one indentation is formed in the bottom, it may be formed in a structure in which the fastening groove is drilled in the indentation.

This structure is such that when the fastener is inserted into the fastening groove, the end of the fastener protrudes upward from the top surface of the fastening groove to prevent the volume of the battery pack from being increased as a whole. It is preferable because the end of the fastener can be located in the indentation.

In the present invention, the fastener may be integrally formed in the molding process of the insulating mounting member, or may be separately manufactured and then coupled to the insulating mounting member. The former method is more preferable in consideration of manufacturing processability and mutual bonding force, and when the insulating mounting member is made of a material having a predetermined elasticity, elastic deformation and restoration may be performed in the process of coupling with the fastening groove.

As mentioned above, a fastening groove is formed in the indentation portion of the insulating cap, and a fastener is formed in a corresponding portion of the insulating mounting member corresponding to the fastening groove, so that they form an easy coupling with each other. The sphere and the fastening groove are preferably formed at both end portions with respect to the upper end of the battery cell in consideration of the positions of the protective circuit module and the electrode terminal.

In some cases, in order to ensure a stable mounting state of the protective circuit module with respect to the insulating mounting member, both ends of the insulating mounting member protrude upwardly, and the fastener is upwardly disposed on the both ends. It may be made of a protruding structure.

Meanwhile, the insulating mounting member may be coupled to the battery cell by an adhesive method using an adhesive so that the insulating mounting member may be stably mounted on the top cap, or as described later, the protective circuit module is mounted by the specific electrode terminal structure. It may be joined together when mechanically coupled to the cap. In the latter case, the adhesive force may be further compensated by applying an adhesive between the insulating mounting member and the top cap.

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.

As another preferred example, the top cap is provided with a pair of protruding electrode terminals (first protruding electrode terminal and second protruding electrode terminal) respectively connected to the anode and the cathode of the electrode assembly. Through holes corresponding to the protruding electrode terminals are formed in the insulating mounting member and the protection circuit module, respectively, and the protruding electrode terminals are inserted into and fixed to the through holes of the insulating mounting member and the protection circuit module. It may be made of a structure in which the insulating mounting member and the protection circuit module for the battery cell are combined.

In the above structure, the coupling of the insulating mounting member and the protective circuit module to the battery cell may be achieved by the pair of protruding electrode terminals being inserted into and fixed to the through holes of the insulating mounting member and the protective circuit module continuously. .

In this case, the protruding electrode terminal may be fixed after being inserted into the through hole of the insulating mounting member and the protection circuit module, and may be variously improved, thereby improving the coupling force between the electrode terminal and the protection circuit module. If so, it is not particularly limited.

Preferably, the end of the protruding electrode terminal is rolled in a state protruding to a predetermined length on the top surface of the protective circuit module can be fixed to the protective circuit module. For example, when the protruding electrode terminal has a conductive rivet structure, a pair of conductive rivets are formed in the top cap in a structure that is connected to the positive electrode and the negative electrode of the electrode assembly, and then the insulating mounting member and The insertion of the insulating mounting member for the battery cell and the protection circuit module by a series of simple processes of successively inserting through the grooves of the protection circuit module and rolling the end of the electrode terminal protruding from the upper surface of the protection circuit module. And electrical connection between the protection circuit module and the electrode terminals can be achieved simultaneously. 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.

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 an inside of the battery case, and the through passage is provided with an electrode assembly in a battery case during a battery cell manufacturing process, and then an 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.

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.

In the above structure, as an example, when the first protruding electrode terminal is an electrical anode, the first protruding electrode terminal may be a structure formed integrally with the top cap. That is, the first protruding electrode terminal may be formed at the same time as the top cap in the process of press molding the top cap. However, of course, the separately prepared protruding terminal may be formed by coupling to the top cap, and for example, a separate protruding 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.

As another example, when the second protruding electrode terminal is an electrically negative electrode, a through hole is formed in the top cap, and the second protruding electrode terminal has a plate-shaped main body and an upper part extending vertically to the upper part of the main body. An extension portion and a lower extension portion inserted into the through hole of the top cap and vertically extending downward to the bottom of the main body, and electrically insulating gasket for mutual insulation at an interface between the second protruding electrode terminal and the through hole of the top cap. In the interposed state, the end portion of the lower extension part may be rolled to couple the second protruding electrode terminal to the top cap.

By the coupling structure of the top cap and the second protruding electrode terminal as described above, the second protruding electrode terminal can be more easily and stably coupled to the top cap, and the upper extension and the lower part of the second protruding electrode terminal The extension part can maintain the coupling of the protective circuit module and the insulating mounting member to the battery cell more firmly and stably.

In addition, at the interface between the second protruding terminal and the top cap through-hole, an electrically insulating gasket for mutual insulation is mounted, so that the second protruding electrode terminal serving as the negative terminal can be insulated with respect to the top cap of the positive electrode. have.

The secondary battery pack according to the present invention can be applied in various ways regardless of the type and appearance of the battery cell, and preferably may be a so-called rectangular battery in which an electrode assembly of a cathode / separator / cathode is embedded in a rectangular metal can. And, particularly preferably, a rectangular lithium secondary battery.

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.

FIG. 1 is a perspective view of a rechargeable battery pack according to an exemplary embodiment of the present invention, and FIG. 2 is an exploded perspective view of FIG. 1.

Referring to these drawings, the secondary battery pack 100 includes a battery cell 130 in which an electrode assembly is embedded in a battery case together with an electrolyte, a top cap 120 for sealing an open top of the battery case, and a protection circuit. The insulating protective member 140, the insulating mounting member 140 to be mounted on the top cap 120 of the battery cell 130, the protective circuit module 150 is mounted, the insulating mounting member 140 is mounted Wrapping is composed of an insulating cap 160 coupled to the upper end of the battery cell 130, the lower cap 170 mounted to the lower end of the battery cell 130 and the like.

The insulating mounting member 140 has both end portions 146 protruding upwards (X), and the protective circuit module 150 is positioned between both end portions 146 of the insulating mounting member 140 to maintain a stable mounting state. Secure. In addition, a fastener 148 protruding in the upper direction X is formed on both end portions 146 of the protruding insulating mounting member 140.

Planar semicircular indentations 162 are formed at both ends of the insulating cap 160 corresponding to the protruding both ends 146 of the insulating mounting member 140, and the indenting portions 162 are insulative mounting. A fastening groove 164 into which the fastener 148 of the member 140 is inserted is drilled.

Therefore, when assembling the secondary battery pack 100, the fastener 148 of the insulating mounting member 140 is inserted into the fastening groove 164 of the insulating cap 160 to be mechanically coupled to the insulating mounting member 140. The coupling of the insulating cap 160 to the made easy.

The electrode terminals of the battery cell 130 include a first protruding electrode terminal 112 and a second protruding electrode terminal 114 protruding in the upper direction X on both sides of the upper end of the top cap 120. The insulating mounting member 140 has through grooves 142 and 144 formed in shapes and sizes corresponding to lower ends of the protruding electrode terminals 112 and 114, and the protruding electrodes in the protection circuit module 150. Through grooves 152 and 154 having a shape and size corresponding to the upper ends of the terminals 112 and 114 are formed.

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 includes the through grooves in which the protruding electrode terminals 112 and 114 are formed at both sides of the insulating mounting member 140. This is achieved by inserting the through holes 152 and 154 formed on both sides of the field 142 and 144 and the protection circuit module 150, and then rolling the ends of the protruding electrode terminals 112 and 114. . In addition, the coupling of the insulating mounting member 140 to the top cap 120 may be further complemented by an adhesive.

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 of the upper portion of the secondary battery pack of FIG.

Referring to FIG. 3, the protruding terminals 112 and 114 are rolled at their respective ends to be electrically connected to the protection circuit module 150 and mechanically fastened. An indentation space portion 122 having a predetermined depth C and indented in a downward direction is formed at a central portion of the top cap 120, and elements 152 mounted on a lower surface of the protection circuit module 150. Has a structure positioned in the indentation space 122. Therefore, the mounting height of the protection circuit module 150 can be further lowered by the indentation space 122, so that the battery capacity of the battery pack of the same standard can be increased.

The fasteners 148 formed at both ends of the insulating mounting member 140 attached to the upper surface of the top cap 120 are coupled in a state of being inserted into the fastening groove 164 of the insulating cap 160, so that the overall stable coupling The structure can be achieved.

4 and 5 respectively show vertical cross-sectional schematic diagrams and planar schematic diagrams in which the portion A of FIG. 3 is enlarged.

Referring to these drawings, the fastener 148 of the insulating mounting member 140 has a wedge shape and the fastening groove 164 of the insulating cap 160 has a slit shape. The wedge-shaped fastener 148 formed on the upper surface of the insulating mounting member 140 is elastically inserted into the fastening groove 164 of the insulating cap 160, the wedge structure by the restoring force of the fastener 148 One end of the structure consists of a structure (B) that is caught on the top surface of the fastening groove 164. Therefore, the fastener 148 inserted into the fastening groove 164 of the insulating cap 160 can be prevented from being detached from the fastening groove 164 by the wedge structure.

In addition, since the fastener 148 is made of a vertical tapered structure of the mushroom shape in the vertical section, it can be easily inserted into the fastening groove 164 from the bottom. Furthermore, in the insulative cap 160, since the indentation 162 indented downward is formed to a predetermined depth D, the end of the fastener 148 is the top surface 166 of the insulative cap 160. It will not protrude upwards.

6 is a schematic diagram showing a coupling structure of the fastening groove and the fastener according to another embodiment of the present invention.

Referring to FIG. 6, a schematic plan view (a) in which a '+' shaped fastening groove 167 is formed at an indentation 163 formed at one end of the insulating cap 160, ' A fastener 148 'is provided in a front schematic diagram (b) and a planar schematic diagram (c) of the fastener 148' having four fastening protrusions 149 corresponding to the + 'shape. The planar schematic diagram (d) of the combined structure is shown in sequence.

Therefore, when the fastener 148 ′ of the insulating mounting member (not shown) is inserted into the fastening groove 167 of the insulating cap (not shown), the fastening protrusions 149 made of plastic resin are self-elastic. Twisting by the '+' shape is inserted into the fastening groove 167, and after being inserted into the fastening groove 167, the fastening protrusions 149 is restored to its original shape by its restoring force to form a mutually fixed coupling.

7 and 8 are schematic views showing a modification of the fastening groove structure according to another embodiment of the present invention.

Referring to these drawings, a 'Y' shaped fastening groove 168 and a '1' shaped fastening groove 169 are formed on the indentation 162 of the insulating cap 160, respectively. The fasteners (not shown) corresponding to the fastening grooves 168 and 169 of this structure have a different number of fastening protrusions 149 compared to the fasteners 148 and 148 'of FIG. 4 or 6. Except for the detailed description is the same as the fastening principle described in Figure 4 or 6 except.

9 is a schematic vertical cross-sectional view of the first protruding electrode terminal according to another embodiment of the present invention.

Referring to FIG. 9, the first protruding electrode terminal 112 ′ is a conductive rivet and includes a plate-shaped head 1122 and a body 1124 extending perpendicular to the head 1122. In addition, since the lower end of the head 1122 is integrally formed with the top cap 120 ′, it is possible to reduce the number of parts when manufacturing the battery pack, and the passage 1121 is provided at the center of the head 1122 and the body 1124. ) Can be used as the 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 view of a second protruding electrode terminal according to another embodiment of the present invention.

Referring to FIG. 10, the second protruding electrode terminal 114 ′ includes a plate-shaped main body 1142, an upper extension 1144 vertically extending upward of the main body 1142, and a through hole of the top cap (FIG. 11: a lower extension 1146 inserted into 126 and extending vertically down the 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 another embodiment of the present invention.

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

As described above, the first protruding electrode terminal 112 ′ is formed with a through passage 1121 for injecting an electrolyte solution in the center portion 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, the protruding end of the first protruding electrode terminal 112 'and the protruding end of the second protruding electrode terminal 114' are respectively rolled, and as shown in FIG. 3, the insulating cap is mounted on the top cap 120 '. The member 140 ′ and the protection circuit module 150 ′ may be stably fixed.

As described above, the secondary battery pack according to the present invention uses a protruding electrode terminal of a specific structure to combine the insulating mounting member and the insulating cap at the top of the battery pack, thereby greatly simplifying the assembly process and providing excellent bonding force. As a result, the structural stability of the battery pack can be improved.

In addition, since the fasteners of the insulating mounting member are not exposed to the outside of the battery, the reliability of the product may be improved in appearance and the tensile strength of the battery pack exterior part may be improved.

Those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims.

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

2 is an exploded perspective view of FIG. 1;

3 is a schematic vertical cross-sectional view of the secondary battery pack of Figure 1;

4 and 5 are vertical cross-sectional schematics and planar schematics, respectively, in which portion A of FIG. 3 is enlarged;

Figure 6 is a schematic diagram showing a coupling structure of the fastening groove and the fastener according to another embodiment of the present invention;

7 and 8 are schematic views of a modification of the fastening groove structure according to another embodiment of the present invention;

9 is a schematic vertical cross-sectional view of a first protruding electrode terminal according to another embodiment of the present invention;

10 is a schematic vertical cross-sectional view of a second protruding electrode terminal according to another embodiment of the present invention;

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

Claims (17)

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 including 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 fastener protrudes upward from an upper surface of the insulating mounting member, and a fastening groove corresponding to the protruding fastener is formed in the insulating cap. In the process of mounting the insulating cap on the insulating mounting member mounted on the battery cell, the fastener is inserted into the fastening groove of the insulating cap and coupled by a mechanical fastening method, thereby making the coupling of the insulating cap to the insulating mounting member. At least one indent is formed on the upper surface of the insulating cap has a predetermined depth and is indented downward, the secondary battery pack characterized in that the fastening groove is drilled in the indent. The secondary battery pack according to claim 1, wherein the battery case is a metal can. The secondary battery pack as claimed in claim 1, wherein the insulating mounting member is made of a plastic resin having elasticity. The secondary battery pack as claimed in claim 1, wherein the fastener is formed on the insulating mounting member to be elastically deformed and coupled in a process of being inserted into the fastening groove of the insulating cap. The secondary battery pack of claim 4, wherein the fastening groove has a slit shape and the fastener has a wedge shape. According to claim 4, The fastener and the fastening groove is the same in the horizontal cross-sectional shape, and when the fastener is inserted into the fastening groove by twisting the fastener so that the horizontal cross-sectional shape coincide with each other, the fastener is elastically restored to the coupling groove Secondary battery pack characterized in that. The secondary battery pack according to claim 6, wherein the horizontal cross-sectional shape of the fastener and the fastening groove is '+' shaped, '1' shaped, or 'Y' shaped. The secondary battery pack according to claim 6, wherein the fastener has a mushroom-shaped upward taper structure on a vertical cross section so that the fastener can be easily inserted into the fastening groove. delete According to claim 1, In order to ensure a stable mounting state of the protective circuit module to the insulating mounting member, both ends in the longitudinal direction of the insulating mounting member protrudes upward, the fastener is upper on the both ends Secondary battery pack, characterized in that protrudes. The method of claim 1, wherein the top cap is formed with a pair of protruding electrode terminals (first protruding electrode terminal and second protruding electrode terminal) connected to the anode and the cathode of the electrode assembly, respectively. Through holes corresponding to the protruding electrode terminals are formed in the insulating mounting member and the protection circuit module, respectively, and the protruding electrode terminals are inserted into and fixed in the through holes of the insulating mounting member and the protection circuit module. Secondary battery pack, characterized in that the combination of the insulating mounting member and the protective circuit module for the battery cell. The secondary battery pack according to claim 11, 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. 12. The method of claim 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 and sealed by a metal ball. A secondary battery pack characterized by the above-mentioned. 12. The battery cell of claim 11, 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 secondary battery pack as claimed in claim 14, wherein the first protruding electrode terminal is integrally formed with the top cap. The method of claim 14, The top cap is formed with a through hole, The second protruding electrode terminal includes a plate-shaped body, an upper extension vertically extending upwardly of the main body, and a lower extension portion inserted into the through hole of the top cap and vertically extending downwardly of the main body. At the interface between the through-hole of the second protruding terminal and the top cap is an electrically insulating gasket for mutual insulation, the end of the lower extension portion is rolled to couple the protruding electrode terminal to the top cap. Secondary Battery Pack. The secondary battery pack as claimed in claim 1, wherein the battery cell is a rectangular lithium secondary battery.

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