KR20150037389A - Secondary Battery Pack Having PCM - Google Patents

Abstract

The present invention relates to a secondary battery pack which comprises a battery cell including a cathode terminal and an anode terminal formed on one surface including a sealing part for sealing the battery cell; and a PCM including a protective circuit board (PCB) including a protective circuit, an external input and output terminal electrically connected to the protective circuit, and an electrically insulated PCM case including the PCB installed, wherein the PCM is characterized by being installed on the upper sealing part in which the cathode terminal and the anode terminal are located, the PCM case consists of a first case member surrounding one surface of the PCB, and a second case member surrounding the other surface of the PCB. A hinge structure connecting the first case member and the second case member is located on the side sealing part of the battery cell, while the PCM is installed on the upper sealing part.

Description

[0001] The present invention relates to a secondary battery pack having a protection circuit module,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a secondary battery pack including a protection circuit module (PCM), and more particularly to a secondary battery pack including a battery cell having a positive terminal and a negative terminal formed on one surface including a sealing portion for sealing the battery cell. And a PCM comprising a protective circuit board (PCB) on which a protection circuit is formed, an external input / output terminal electrically connected to the protection circuit, and an electrically insulating PCM case on which the PCB is mounted, The PCM case is mounted on an upper sealing portion where the positive terminal and the negative terminal of the battery cell are electrically connected to the battery cell. The PCM case includes a first case member surrounding one side of the PCB and a second case member surrounding the other side of the PCB, Wherein a hinge structure for connecting the first case member and the second case member in a state where the PCM is mounted on the upper sealing portion is located on the side of the side sealing portion of the battery cell, To a battery pack.

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, a device such as a notebook can insert and detach a battery according to a user's need, while a device such as some mobile phones may require the use of an embedded battery pack because of its structure and capacity.

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, a method in which a nickel plate is welded or soldered to an electrode terminal of a battery cell, a PCB is welded to one side of the battery cell, and a protective tape is attached to the other side of the battery cell, A PCM is connected to a battery cell, and the PCM is housed in an electrically insulating case to manufacture a battery pack.

The conventional PCM case is formed of two units composed of upper and lower separated type cases and has a structure in which the upper case is coupled with the PCB and the safety element mounted on the lower case.

However, the PCM case has a disadvantage in that it is not easy to automate the process because the process of coupling the separate case members is complicated and requires manual work for accurate coupling.

Particularly, since detachable case members can not guarantee dimensional stability in the process of coupling each other, there is a problem that the defective rate of PCM is high.

Therefore, there is a high need for a PCM case technology that can safely protect the PCM with a simplified process.

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

Specifically, it is an object of the present invention to provide a secondary battery pack which can be easily assembled.

To achieve these and other advantages and in accordance with the purpose of the present invention, as embodied and broadly described herein,

A battery cell having a positive electrode terminal and a negative electrode terminal formed on one surface including a sealing portion for sealing a battery cell; And

A PCM comprising a protection circuit board (PCB) on which a protection circuit is formed, an external input / output terminal electrically connected to the protection circuit, and an electrically insulating PCM case on which the PCB is mounted;

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The PCM case is mounted on an upper sealing portion where the positive and negative terminals of the battery cell are electrically connected to the battery cell. The PCM case includes a first case member surrounding one side of the PCB, And a hinge structure for connecting the first case member and the second case member in a state in which the PCM is mounted on the upper sealing member is located at a side sealing portion side of the battery cell consist of.

Therefore, since the secondary battery pack according to the present invention includes the one-piece type PCM case in which the first case member and the second case member are constituted by one member by the hinge structure, compared with the conventional vertically-separable type PCM case, Not only the assembly process is possible, but also the process automation is easy.

Particularly, the hinge structure of the PCM case configured to be positioned on the side sealing portion side of the battery cell as in the present invention has a shorter total length of the hinge structure than the hinge structure configured to be positioned on the upper sealing side of the battery cell. It is relatively easy to form the hinge and it is possible to minimize the breakage of the battery cell sealing portion by the hinge during the fastening process of the PCM case.

In one specific example, the first case member may have a box structure that surrounds the bottom surface of the PCB, and the second case member may have a structure that covers the top surface of the PCB while being coupled with the first case member.

In this structure, the coupling method of the first case member and the second case member may be a structure that is simply fastened with a fastening hole and a fastening groove without a separate member. More specifically, The case member may have a structure in which one or more fasteners and fastening grooves are formed so as to be mutually coupled, and fasteners are inserted into the fastening grooves.

Preferably, the first case member or the second case member surrounds a portion excluding the external input / output terminal so that the external input / output terminal protrudes to the outside of the secondary battery pack to electrically connect to the device. Therefore, the first case member or the second case member may be provided with an opening or a depression at a portion where the external input / output terminal electrically connected to the protection circuit protrudes.

The external input / output terminal may be electrically connected to one side of the PCB, for example, protruding from one side of the upper end of the secondary battery pack. However, the protruding position of the external input / output terminal is not limited, Can be changed accordingly.

At this time, the shape of the protrusion of the external input / output terminal may be applied not only to a protruding shape but also various shapes such as 'a' or 'b' depending on the structure of the device.

On the other hand, the portion where the external input / output terminal protrudes is vulnerable to a short circuit due to external force. Therefore, the external input / output terminal may be a flexible printed circuit board (FPCB) having high flexibility so as to have flexibility with respect to external force of the battery pack, At the end of the terminal, a connector for electrical connection with the device may be formed.

In one specific example, the type of battery cell that can be used in the secondary battery pack of the present invention is not limited. For example, an electrode assembly having a separator structure interposed between the anode and the cathode, And a pouch type secondary battery which is sealed in a battery case of a laminate sheet including a resin layer and has a small thickness and a low weight.

At this time, the battery cell may be a lithium secondary battery having a large energy storage amount per volume.

In order to stably fix the outer circumferential surface of the battery cell to the battery cell body and to stably secure the electrical connection between the electrode terminal of the battery cell and the PCB, A label may be attached to the outer surface of the housing.

In this case, the attachment range of the label can be generally set in consideration of the protruding length and shape of the external input / output terminal.

That is, when the connector is mounted at the end of the external input / output terminal and the external input / output terminal is largely protruded from the battery cell in the form of 'a' or 'c' so as to be connected to the device, The outer surface of the battery cell and the PCM except the external input / output terminal may be attached to the outer surface of the battery cell.

On the other hand, when the external input / output terminal is not protruded from the PCM but the connector is formed on the PCM, the label can be attached to the PCM except for the connector and the battery cell in a wrapping manner. It can be attached in the form of wrapping the PCM except the outer circumferential surface of the side of the battery cell.

The present invention also provides a device including the secondary battery pack as a power source. The device may be one selected from, for example, a mobile phone, a portable computer, a smart phone, a smart pad, a tablet PC, and a netbook. The scope of application is not limited thereto.

As described above, the secondary battery pack according to the present invention includes the PCM case in which the first case member and the second case member are constituted by one member by the hinge structure. Therefore, as compared with the conventional vertically- Not only a simple assembling process is possible, but also the process automation is easy. In addition, since the hinge of the PCM case is located on the side of the side of the battery cell, the length of the hinge can be shortened, and breakage of the battery cell sealing portion due to the hinge can be minimized in the process of fastening the PCM case .

1 is an exploded perspective view of a secondary battery pack according to an embodiment of the present invention;
Figure 2 is an enlarged view of the PCM case of Figure 1;
3 to 5 are perspective views illustrating a process of manufacturing the secondary battery pack of FIG. 1;

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 is a schematic exploded perspective view of a secondary battery pack according to an embodiment of the present invention, and Fig. 2 is an enlarged view of the PCM case of Fig.

Referring to these drawings, the secondary battery pack 100 mainly includes a battery cell 110, a protection circuit module (PCM) 120, and a label (not shown) having an anode terminal 114 and a cathode terminal 112 protruded at one end 140).

The negative electrode terminal 114 and the positive electrode terminal 112 of the battery cell 110 are electrically connected to a protection circuit board (PCB) 122 of the PCM 120 as a plate-shaped conductive member.

The battery cell 110 is a pouch type secondary battery in which an electrode assembly having a positive electrode, a negative electrode, and a separator interposed between an anode and a cathode is sealed in a battery case of a laminate sheet including a metal layer and a resin layer, And an upper sealing part 115 which is a thermal welding residue is formed on the upper end of the battery cell case 110. A side surface of the pouch-shaped battery case 120 excluding the upper sealing part and the opposite end parts thereof is provided with a side sealing part And the anode terminal 114 and the cathode terminal 112 protrude from the battery cell through the upper sealing portion 115. [

The PCM 120 includes a PCB 122 on which a protection circuit is formed, an external input / output terminal 124 electrically connected to the protection circuit of the PCB 122, and a PCM case 128 And is mounted on the upper sealing portion 115 of the battery cell 110 while being electrically connected to the battery cell 110.

At this time, the external input / output terminal 128 has a flexible printed circuit board structure in which a connector 130 is mounted at an end portion thereof.

The PCM case 124 includes a first case member 210 and a second case member 220. The first case member 210 is box-shaped so that the PCB 122 can be housed therein. The case member 220 extends from one side of the first case member 210 while being connected to the first case member by a hinge structure 200.

Hereinafter, the structures of the first case member 210 and the second case member 220 will be described in more detail.

Specifically, first fasteners 231, 232, 234, and 235 protruding inward are formed on the upper ends of both sides of the first case member 210, 242, 244, and 245 are formed at positions corresponding to the first fasteners 231, 232, 234, and 235 at the ends thereof. The first case member 210 is provided with a second engagement groove 251 at an opposite end of the hinge structure 200 and a second engagement groove 251 at a position corresponding to the second engagement groove 251 A second fastening hole 262 protruding outward is formed.

The second case member 220 can be moved in the upper direction of the first case member 210 by the leverage principle of the hinge structure 200. At this time, the first fasteners 231 of the first case member 210 242 and 244 and 245 of the second case member and the second fastening holes 262 of the second case member 220 are inserted into the first case 262, The first case member 210 and the second case member 220 are engaged by being inserted into the second fastening groove 261 of the member 210. [

The first case member 210 is provided with the negative terminal 114 and the positive terminal 112 at positions corresponding to the negative terminal 114 and the positive terminal 112 so that the negative terminal 114 and the positive terminal 112 can be received on the PCM case, And a second recessed portion 272 is formed to allow the external input / output terminal 124 to contact the PCB 122. [

3 and 5 are perspective views illustrating a process of manufacturing the secondary battery pack of FIG. 1 in sequence.

These drawings will be described with reference to FIGS. 1 and 2 as follows.

3, the upper surface of the positive electrode terminal 112 of the battery cell 110 coupled with the positive terminal connection portion 123a of the PCB 122 and the upper surface of the battery cell 110 coupled to the negative terminal connection portion 123b, The nickel plate 132 is welded by ultrasonic welding to the upper surface of the negative electrode terminal 114 of FIG. Then, the negative electrode terminal 114 and the positive electrode terminal 112 of the battery cell 110 are welded to the negative electrode terminal connecting portion 123b and the positive electrode terminal connecting portion 123a formed on the PCB 122 by spot welding Thereby electrically connecting the battery cell 110 and the PCB 122.

The PCB 122 is inserted into the first case member 210 while introducing the positive terminal 112 and the negative terminal 114 of the battery cell 110 into the first indentations 270 and 271 of the first case member 210. [ The electrode terminals 112 and 114 of the battery cell 110 are bent so that the PCB 120 and the PCM case 120 are connected to the upper sealing part 110 of the battery cell 110, Output terminal 124 is connected to the PCB 122 and the second case member 220 is coupled to the first case 210 after the external input / The state in which the first case 210 and the second case 220 are coupled can be seen in FIG.

Finally, as shown in FIG. 1, the process of wrapping the PCM 120 and the outer circumferential surface of the side of the battery cell 110 with the label 140 is performed to complete the secondary battery pack 100.

The label 140 is fixed to the main body of the battery cell 110 in a state of being insulated from the battery cell 110 while the side sealing part 116 is tightly fixed to the main body of the battery cell 110, Thereby more securely securing the electrical connection between the terminal 114 and the PCB 122.

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 (15)

A battery cell having a positive electrode terminal and a negative electrode terminal formed on one surface including a sealing portion for sealing a battery cell; And
A PCM comprising a protection circuit board (PCB) on which a protection circuit is formed, an external input / output terminal electrically connected to the protection circuit, and an electrically insulating PCM case on which the PCB is mounted;
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The PCM case is mounted on an upper sealing portion where the positive and negative terminals of the battery cell are electrically connected to the battery cell. The PCM case includes a first case member surrounding one side of the PCB, And a hinge structure for connecting the first case member and the second case member in a state where the PCM is mounted on the upper sealing member is located on the side of the side portion of the battery cell And a secondary battery pack. The secondary battery pack according to claim 1, wherein the external input / output terminal is electrically connected to one side of the PCB in such a manner that the external input / output terminal protrudes outward from one side of an upper end of the secondary battery pack. 2. The secondary battery according to claim 1, wherein the first case member has a box structure surrounding a lower surface of the PCB, and the second case member has a structure to cover an upper surface of the PCB while engaging with the first case member. pack. The secondary battery pack according to claim 3, wherein the first case member or the second case member is provided with an opening or a depressed portion at a portion where the external input / output terminal protrudes. The secondary battery pack according to claim 1, wherein the first case member and the second case member are formed with one or more fasteners and fastening grooves which are mutually coupled. The secondary battery pack according to claim 1, wherein the external input / output terminal is a flexible printed circuit board (FPCB). 7. The secondary battery pack according to claim 6, wherein a connector for electrical connection with the device is formed at an end of the external input / output terminal. The secondary battery according to claim 1, wherein the battery cell is a pouch-type secondary battery in which an electrode assembly having a separator interposed between an anode and a cathode is sealed in a battery case of a laminate sheet including a metal layer and a resin layer Battery pack. The secondary battery pack according to claim 1, wherein a label is attached to the PCM excluding the external input / output terminal so as to surround the battery cell. The secondary battery pack according to claim 9, wherein the label comprises a PCM except for the external input / output terminal and a structure for wrapping the heat-sealed outer peripheral surface of the side surface of the battery cell. The secondary battery pack according to claim 1, wherein a label is attached in a form to wrap the PCM and the battery cell except the connector. 12. The secondary battery pack according to claim 11, wherein the label includes a PCM except for the connector and a structure for wrapping the heat-sealed outer peripheral surface of the side surface of the battery cell. The secondary battery pack according to claim 1, wherein the battery cell is lithium secondary battery. 13. A device comprising a secondary battery pack according to any one of claims 1 to 13 as a power source. 15. The device of claim 14, wherein the device is selected from a cell phone, a portable computer, a smart phone, a smart pad, a tablet PC, a netbook.

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