KR101451195B1 - Secondary Battery Pack - Google Patents

Abstract

A secondary battery pack having a structure in which a protection circuit module (PCM) is mounted on an upper part of a plate-shaped battery cell having electrode terminals formed on an upper end thereof, the electrode terminal of the battery cell being formed of a plate-shaped conductive member; The PCM includes a PCB on which a protection circuit is formed, a safety element electrically connected between the electrode terminal of the battery cell and the protection circuit of the PCB, an external input / output terminal electrically connected to the protection circuit of the PCB, And an electrically insulative module case surrounding the PCB and the safety element; Wherein the PCM is mounted on an upper case extension part of the battery cell while being electrically connected to electrode terminals of the battery cell.

Description

[0001] The present invention relates to a secondary battery pack,

The present invention relates to a secondary battery pack having a novel structure, and more particularly, to a secondary battery pack having a structure in which a protection circuit module (PCM) is mounted on an upper part of a plate- Wherein the electrode terminal of the battery cell is formed of a plate-shaped conductive member; The PCM includes a PCB on which a protection circuit is formed, a safety element electrically connected between the electrode terminal of the battery cell and the protection circuit of the PCB, an external input / output terminal electrically connected to the protection circuit of the PCB, And an electrically insulative module case surrounding the PCB and the safety element; And the PCM is mounted on the upper case extension part of the battery cell while being electrically connected to the electrode terminals of the battery cell.

Due to the development of technology and demand for mobile devices, the demand for secondary batteries is also rapidly increasing. Among them, lithium secondary batteries, which have high energy density, high operating voltage and excellent storage and life characteristics, It is widely used as an energy source.

The secondary battery may be used in a detachable structure that is free to be inserted or removed depending on the type of external equipment to which the secondary battery is to be used, or may be used as a built-in structure in which the secondary battery is embedded in an external device. For example, devices such as notebooks can insert and leave batteries according to the user's needs, while devices such as some mobile phones, MP3 (MPEG Audio Layer-3), etc., Use is also required.

On the other hand, lithium secondary batteries have a variety of combustible materials, and they have a disadvantage in terms of safety because of the danger of overheating, overcurrent, other physical external impact, and the like. Therefore, a lithium secondary battery is connected to a battery cell such as a PTC (Positive Temperature Coefficient) element and a protection circuit module (PCM) as a safety element that can effectively control an abnormal state such as overcharging or overcurrent.

Generally, the built-in secondary battery pack uses a plate-shaped battery cell suitable for an electrical connection structure, and the PCM is connected to the battery cell through a conductive nickel plate by welding or soldering. That is, in the state where the nickel plate is welded or soldered to the electrode terminal of the battery cell, the F-PCB is attached to one side of the double-sided tape and the protective tape is attached to the other side, The PCM is connected to the battery cell by the method of welding the plate to manufacture the battery pack.

Such safety devices, including PCM, should maintain electrical connection with the electrode terminals while at the same time maintaining electrical isolation from other parts of the battery cell.

Therefore, the insulating tape is attached to each member including the PCM, and a very complicated process such as attaching an insulating tape or printing a bar code is performed by bending a part of the sealing portion of the battery case having the battery cell therein do.

As described above, since a plurality of welding processes and a large number of parts are required to form a safe connection form, the assembling process of the battery pack is complicated and the manufacturing cost is increased.

In addition, when an external impact is applied, the battery pack may cause problems such as breakage of the PCM due to use of the insulating tape having low mechanical rigidity, and remarkable decrease in dimensional stability.

Accordingly, there is a high need for a technique capable of reducing the number of members mounted on the battery cell to simplify the assembling process, minimizing the welding process, thereby stably joining the members mounted on the battery cell and protecting the PCM It is true.

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, it is an object of the present invention to provide a battery pack with a compact and light weight as a whole by minimizing a welding process and a assembling process by a novel fastening structure for fixing battery modules.

According to an aspect of the present invention, there is provided a secondary battery pack having a protection circuit module (PCM)

Wherein the electrode terminal of the battery cell is formed of a plate-shaped conductive member;

The PCM includes a PCB on which a protection circuit is formed, a safety element electrically connected between the electrode terminal of the battery cell and the protection circuit of the PCB, an external input / output terminal electrically connected to the protection circuit of the PCB, And an electrically insulative module case surrounding the PCB and the safety element;

And the PCM is mounted on the upper case extension of the battery cell in a state of being electrically connected to the electrode terminals of the battery cell.

That is, since the secondary battery pack according to the present invention has a structure in which the PCB and the safety element are inserted into the module case and the PCM is mounted on the upper case extension portion of the battery cell, as compared with the conventional secondary battery pack, The PCM can be effectively protected, the number of parts can be significantly reduced, and the manufacturing process can be greatly improved.

The battery cell that can be used in the secondary battery pack of the present invention can be of various types, and preferably, the electrode assembly of the positive electrode / separator / negative electrode structure is formed of a laminate sheet, which is sealed in a battery case of a laminate sheet including a metal layer and a resin layer And may be a pouch-type secondary battery having a small thickness and a low weight.

In such a pouch type secondary battery, the upper case extension may be an upper sealing part formed by heat sealing sealing of the battery case. Therefore, the battery cell can easily mount the PCM on the upper case extension portion, which is the upper sealing portion. For example, the PCM can be bent by bending a plate-shaped electrode terminal protruding in parallel to the upper end of the battery case, As shown in Fig.

For example, the safety element may be a PTC element whose resistance increases with an increase in temperature or a fuse that is turned off when the temperature rises. However, It is not.

In one specific example, the module case comprises:

A first case in which a PCB is mounted on one side of the first side and an electrode terminal connection part for connecting to an electrode terminal of the battery cell is formed on an opposite side of the first side; And

A second case having a plate-like structure and hinged to the first case so as to seal the electrode terminal connection part in a state where the electrode terminal of the battery cell is connected to the electrode terminal connection part;

≪ / RTI >

Therefore, since the PCB is mounted on the first case of the specific structure and is assembled by the second case connected thereto by the hinge fastening structure, the stable internal mounting structure of the PCB and the electrode terminal Lt; / RTI >

In the above structure, the electrode terminal connection portion may have a structure in which one end portion is positioned on the first case and the other end portion is extended on the second case, whereby the electrode terminal connection portion covers the electrode terminals of the battery cell Structure. As a result, even if the conventional welding process is omitted, both surfaces of the electrode terminal are easily connected to the electrode terminal connection portion, which is highly desirable.

The fastening structure of the module case is not particularly limited as long as the fastening structure of the module case is a structure that can fasten the first case and the second case constituting the module case. Preferably, both ends of the first case are bent upward, The bending portion may be formed with a fastening hole or a fastening groove, and both side ends of the second case may have fastening holes or fastening holes corresponding to the fastening holes or fastening holes.

By such a coupling method, the assembling process of the first case and the second case can be facilitated and a more stable coupling state can be ensured.

The module case may be mounted on the upper case extension part of the battery cell so that the opposite surface of the first case where the electrode terminal connection part is located is exposed to the outside.

On the other hand, the PCB may be provided with an insulating tape or a PCM cover. Accordingly, the electrical connection state between the electrode terminal of the battery cell and the PCB can be more stably secured while maintaining the overall insulation state.

The present invention also provides a protective circuit module having a specific structure used in the construction of the secondary battery pack.

Specifically, the protection circuit module according to the present invention is a protection circuit module (PCM) mounted on an upper part of a plate-shaped battery cell having electrode terminals formed of a plate-shaped conductive member at the upper end thereof, PCB); A safety element electrically connected between the electrode terminal of the battery cell and the protection circuit of the PCB; An external input / output terminal electrically connected to the protection circuit of the PCB; And an electrically insulating module case surrounding the PCB and the safety device; As shown in FIG.

In a general assembling process of a battery pack, a PCM assembly is installed on a battery cell by connecting a connecting member, F-PCM, etc. by welding and attaching an insulating tape to each step. Therefore, mounting of the PCM assembly on the battery cell using a plurality of welding parts and the like requires a plurality of processes, and problems such as mechanical stiffness as well as low structural stability are caused.

On the contrary, since the protection circuit module according to the present invention has a structure in which the safety element is embedded in the module case in a state where the safety element is coupled to the PCB, the structural stability of the battery pack is improved and the manufacturing process of the battery pack can be greatly simplified have.

In one preferred embodiment, the module case has a plate-like structure, and a PCB is mounted on one side of the first side, and an electrode terminal connecting portion for connecting to the electrode terminal of the battery cell is formed on the opposite side of the first side case; And a second case coupled to the first case to hermetically seal the electrode terminal connection portion when the electrode terminal of the battery cell is connected to the electrode terminal connection portion; . ≪ / RTI >

Specifically, the electrode terminal connection portion may have a structure in which one end portion is located on the first case and the other end portion is extended on the second case.

In addition, both side ends of the first case are upwardly bent, fastening holes or fastening grooves are formed in the upwardly bent portions, and fastening grooves or fastening holes corresponding to the fastening holes or fastening holes are formed on both side ends of the second case. A sphere may be formed.

That is, since the module case has the hinge structure of the first and second cases including the electrode terminal connection portion, the conventional welding process and the insulating parts can be greatly simplified.

The present invention also provides a method of manufacturing the secondary battery pack.

Specifically, in the secondary battery pack according to the present invention,

(a) a process in which the electrode terminals of the battery cell are positioned on the electrode terminal connection portion when the first case and the second case of the PCM are opened;

(b) electrically connecting the PCM to the battery cell by folding the second case against the first case; And

(c) bending the battery cell electrode terminal to mount the PCM on the upper case extension;

, ≪ / RTI >

This manufacturing method can provide a battery pack in which the welding process is reduced and the structural stability is improved as compared with the manufacturing process of the conventional built-in secondary battery pack.

The present invention also provides a mobile device including the secondary battery pack. Preferable examples of such a mobile device include, but are not limited to, a mobile phone, a PDA, a digital camera, a portable navigator, and a portable game machine.

As described above, the secondary battery pack according to the present invention is characterized in that, based on a specific structure for mounting the PCM including the module case formed of the first case and the second case on the upper case extension part of the battery cell, It can be simplified, and the structural stability can be improved.

1 is a schematic diagram of a PCM according to one embodiment of the present invention;
2 is a schematic view of a built-in rechargeable battery pack according to an embodiment of the present invention;
3 is a schematic view of a process of mounting the PCM of FIG. 2 on the extension of the upper case of the battery cell;
Fig. 4 is a schematic view in which the PCM of Fig. 3 is mounted on an extension of the upper case of the battery cell.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings, but the present invention is not limited by the scope of the present invention.

FIG. 1 schematically illustrates a PCM according to one embodiment of the present invention.

1, the PCM 300 is electrically connected between a PCB 310 on which a protection circuit is formed, a protection circuit on one side (not shown) of the battery cell, and a protection circuit on the PCB 310 An external input / output terminal (not shown) electrically connected to the protection circuit of the PCB 310 and an electrically insulating module case 340 (not shown) surrounding the PCB 310 and the safety device 320, (See FIG. 2).

FIG. 2 schematically shows a part of a built-in rechargeable battery pack according to an embodiment of the present invention. FIG. 3 shows a process of mounting the PCM of FIG. 2 on an extension of an upper case of a battery cell. And FIG. 4 is a schematic diagram in which the PCM of FIG. 3 is mounted on the extension of the upper case of the battery cell.

Referring to these figures together with FIG. 1, the secondary battery pack 100 has a structure in which the PCM 300 is mounted on the upper part of the plate-shaped battery cell 200.

The battery cell 200 is a plate-shaped battery cell in which electrode terminals 210 and 220 made of a plate-shaped conductive member are formed on an upper surface of the battery cell 200. The electrode assembly of the anode / separator / cathode structure includes a metal layer and a laminate sheet And the battery case 230 is sealed.

Here, the upper case extension 231 means an upper sealing part formed by the heat sealing sealing of the battery case 230.

The secondary battery pack 100 includes a PCB 310 electrically connected to the battery cell electrode terminals 210 and 220 and a PCM 300 having a safety element 320 inserted therein, It is possible to effectively protect the PCM compared to the conventional secondary battery pack and to significantly reduce the number of components and greatly improve the manufacturing processability.

The module case 340 includes a first case 341 and a second case 342, each of which has a plate-like structure.

The first case 341 is mounted on one side of the PCB 310 and electrode terminal connection portions 343 and 344 for connecting to the electrode terminals 210 and 220 of the battery cell are formed on the opposite sides of one surface have

The second case 342 has a first case 341 and a hinge structure 342 for sealing the electrode terminal connecting portions 343 and 344 in a state where the electrode terminals 210 and 220 of the battery cell are connected to the electrode terminal connecting portions 343 and 344, Lt; / RTI >

More specifically, the electrode terminal connection portions 343 and 344 extend in such a manner that one end portion of the electrode terminal connection portion 343 is positioned on the first case 341 and the other end portion is positioned on the second case 342. The electrode terminal connection portions 343 and 344 And are bent in such a manner as to enclose the electrode terminals 210 and 220 of the battery cell.

Both ends of the first case 341 are bent upward and fastening holes 346 are formed in the upward bent portion 345. Both ends of the second case 342 are fastened to the fastening holes 346 And corresponding fastening grooves 347 are formed.

Therefore, even when a separate welding process is omitted, the electrode terminals 210 and 220, the electrode terminal connection portions 343 and 344, and the PCB 310 (not shown) of the battery cell are assembled by assembling the first case 341 and the second case 342, ) Can be achieved.

The module case 340 is mounted on the upper case extension portion 231 of the battery cell so that the opposing face of the first case 341 on which the electrode terminal connection portions 343 and 344 are located is exposed to the outside.

In addition, an insulating tape (not shown) is attached to the PCB 310 to more securely secure the electrical connection between the electrode terminal of the battery cell and the PCB.

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.

Claims (18)

A secondary battery pack having a structure in which a protection circuit module (PCM) is mounted on an upper portion of a plate-shaped battery cell having electrode terminals formed on an upper surface thereof,
Wherein the electrode terminal of the battery cell is formed of a plate-shaped conductive member;
The PCM includes a PCB on which a protection circuit is formed, a safety element electrically connected between the electrode terminal of the battery cell and the protection circuit of the PCB, an external input / output terminal electrically connected to the protection circuit of the PCB, And an electrically insulative module case surrounding the PCB and the safety element;
Wherein the PCM is mounted on an upper case extension of the battery cell while being electrically connected to the electrode terminals of the battery cell;
In the module case,
A first case in which a PCB is mounted on one side of the first side and an electrode terminal connection part for connecting to an electrode terminal of the battery cell is formed on an opposite side of the first side; And
A second case having a plate-like structure and hinged to the first case so as to seal the electrode terminal connection part in a state where the electrode terminal of the battery cell is connected to the electrode terminal connection part; , ≪ / RTI >
Wherein the electrode terminal connection portion is extended on one side of the first case and the other side of the electrode terminal connection portion is on the second case. The secondary battery pack according to claim 1, wherein the battery cell is a secondary battery in which an electrode assembly having a positive electrode / separator / negative electrode structure is sealed in a battery case of a laminate sheet including a metal layer and a resin layer. The secondary battery pack according to claim 1, wherein the upper case extension part is an upper sealing part formed by heat sealing sealing of the battery case. The secondary battery pack according to claim 1, wherein the safety device is a PTC device or a fuse. delete delete The secondary battery pack according to claim 1, wherein the electrode terminal connection portion is bent in such a manner as to surround electrode terminals of the battery cells. [2] The apparatus according to claim 1, wherein both ends of the first case are upwardly bent, and the upward bent portions are formed with fastening holes or fastening grooves, and at both side ends of the second case, Wherein a fastening groove or a fastening hole is formed in the outer peripheral surface of the battery case. The secondary battery pack according to claim 1, wherein the module case is mounted on the upper case extension part of the battery cell such that an opposing face of a face on which the electrode terminal connection part is located in the first case is exposed to the outside. The secondary battery pack according to claim 1, wherein the PCB is provided with an insulating tape or a PCM cover. 1. A protection circuit module (PCM) mounted on an upper portion of a plate-shaped battery cell having electrode terminals formed of a plate-shaped conductive member at an upper end thereof,
A substrate (PCB) on which a protection circuit is formed;
A safety element electrically connected between the electrode terminal of the battery cell and the protection circuit of the PCB;
An external input / output terminal electrically connected to the protection circuit of the PCB;
And
An electrically insulative module case surrounding the PCB and the safety element;
In the module case,
A first case in which a PCB is mounted on one side of the first side and an electrode terminal connection part for connecting to an electrode terminal of the battery cell is formed on an opposite side of the first side; And
A second case having a plate-like structure and hinged to the first case so as to seal the electrode terminal connection part in a state where the electrode terminal of the battery cell is connected to the electrode terminal connection part;
And the electrode terminal connection portion is formed so that one end portion is located on the first case and the other end portion is extended on the second case
Wherein the protection circuit module includes a protection circuit module. delete delete [12] The apparatus according to claim 11, wherein both ends of the first case are upwardly bent, and the upward bent portions are formed with fastening holes or fastening grooves, and both side ends of the second case correspond to the fastening holes or fastening grooves And a fastening groove or a fastening hole is formed in the housing. A method for manufacturing a secondary battery pack according to claim 1,
(a) a process in which the electrode terminals of the battery cell are positioned on the electrode terminal connection portion when the first case and the second case of the PCM are opened;
(b) electrically connecting the PCM to the battery cell by folding the second case against the first case; And
(c) bending the battery cell electrode terminal to mount the PCM on the upper case extension;
Wherein the first and second battery packs are assembled together. A mobile device comprising a secondary battery pack according to claim 1. A secondary battery pack having a structure in which a protection circuit module (PCM) is mounted on an upper portion of a plate-shaped battery cell having electrode terminals formed on an upper surface thereof,
Wherein the electrode terminal of the battery cell is formed of a plate-shaped conductive member;
The PCM includes a PCB on which a protection circuit is formed, a safety element electrically connected between the electrode terminal of the battery cell and the protection circuit of the PCB, an external input / output terminal electrically connected to the protection circuit of the PCB, And an electrically insulative module case surrounding the PCB and the safety element;
Wherein the PCM is mounted on an upper case extension of the battery cell while being electrically connected to the electrode terminals of the battery cell;
In the module case,
A first case in which a PCB is mounted on one side of the first side and an electrode terminal connection part for connecting to an electrode terminal of the battery cell is formed on an opposite side of the first side; And
And a second case coupled to the first case to hermetically seal the electrode terminal connection portion when the electrode terminal of the battery cell is connected to the electrode terminal connection portion,
At both side ends of the second case, fastening grooves or fastening holes corresponding to the fastening holes or fastening holes are formed at both ends of the first case, And the second battery pack. 1. A protection circuit module (PCM) mounted on an upper portion of a plate-shaped battery cell having electrode terminals formed of a plate-shaped conductive member at an upper end thereof,
A substrate (PCB) on which a protection circuit is formed;
A safety element electrically connected between the electrode terminal of the battery cell and the protection circuit of the PCB;
An external input / output terminal electrically connected to the protection circuit of the PCB;
And
An electrically insulative module case surrounding the PCB and the safety element;
In the module case,
A first case in which a PCB is mounted on one side of the first side and an electrode terminal connection part for connecting to an electrode terminal of the battery cell is formed on an opposite side of the first side; And
A second case having a plate-like structure and hinged to the first case so as to seal the electrode terminal connection part in a state where the electrode terminal of the battery cell is connected to the electrode terminal connection part;
At both side ends of the second case, fastening grooves or fastening holes corresponding to the fastening holes or fastening holes are formed at both ends of the first case, Wherein the protection circuit module includes a protection circuit module.

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