KR101863699B1 - Battery Pack Comprising Battery Cell with Peripheral Edge Formed by Hot Melting - Google Patents

Abstract

The upper end sealing portion, at which the electrode terminal is located, is vertically bent so as to be parallel to the upper end outer wall of the electrode assembly receiving portion, and the upper end side sealing portion Wherein the battery cells are vertically bent so as to be in close contact with the outer side wall of the electrode assembly receiving portion and include a frame-like outer peripheral edge portion formed by hotmelting hot melt resin; A protection circuit board (PCB) including an electrode terminal connection portion for electrically connecting the protection circuit to an electrode terminal of the battery cell, and mounted on the upper sealing portion in parallel with the upper outer wall of the electrode assembly receiving portion; An upper case coupled to an upper portion of the PCB; And an external label attached to the battery cell so as to surround the PCB in a state that the PCB is mounted on the PCB. The PCB mounted on the upper sealing portion of the battery cell is fixed to the battery cell by the outer edge portion, And a battery pack.

Description

[0001] The present invention relates to a battery pack having a battery cell having a peripheral edge portion formed by hot-melting,

The present invention relates to a battery pack including a battery cell having a peripheral edge portion formed by hot melt, and a method of manufacturing a battery pack using the same.

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 phones, MPEG Audio Layer-3 (MP3), tablet PCs, smart pads, etc., The use of built-in battery packs is also a problem.

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.

Since such a secondary battery is preferably manufactured with a small size and weight, a prismatic battery or a pouch-type battery having a small weight to capacity ratio is mainly used as a battery cell of a secondary battery. Particularly, a pouch-shaped battery using an aluminum laminate sheet or the like as an exterior member has recently attracted a great deal of attention due to its advantages such as low weight and low manufacturing cost.

When a pouch type battery cell is used to construct a battery pack, a PCM is connected to an electrode of the battery cell while the battery cell is mounted on the case, and a label is attached to the outer surface of the case, Pack. In this case, for example, an assembly structure of the upper cover and the lower cover for covering the outer surface of the battery cell, or a frame structure for fixing the corner portion of the battery cell is used.

However, the need for a battery cell with a more compact structure and improved structural stability has increased, and PCM housed in a PCM case for mounting a PCB and a PCB is mounted on the outer surface of the receiving portion of the battery cell and a double- And a method of mounting them by using the above method.

Specifically, Fig. 1 is an exploded perspective view of a battery pack in which a pouch-shaped battery cell is housed.

1, a battery pack 100 includes a battery cell 110, an upper case 120, a lower case 130, a PCM 140, and an external label 150 .

The battery cell 110 includes a pouch-shaped battery cell 110 having electrode terminals 111 and 112 and a terrace 113 formed on an upper surface thereof.

The PCM 140 includes a protective circuit board (PCB) 141 on which a protection circuit is formed and a PCM case on which the PCB 141 is mounted. The PCM case includes a PCM holder 142 The PCM 140 is mounted on the terrace 113 of the battery cell 110 while being electrically connected to the battery cell 110.

A double-sided adhesive tape 143 is attached to the outer surface of the battery compartment 110 and the terrace 113 so that the outer surface of the battery compartment 110 and the terrace 113, The outer surface of the PCM 140 is fixed with the double-sided adhesive tape 143 attached thereto.

However, in the case of fixing using the above-described method, there is a problem that the mounting state of the PCM by the double-sided tape easily becomes unstable due to an external impact or the like. Further, Process costs were incurred.

Accordingly, there is a high need for a battery pack manufacturing technique capable of maximizing the battery capacity while solving the above problems, while being effective in reducing durability and cost.

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

Specifically, an object of the present invention is to provide a battery pack including a pouch-shaped battery cell by applying a hot-melt method to the battery pack, thereby easily assembling the battery pack without using a member such as a PCM holder or a lower case, And to provide a battery pack in which the battery capacity is maximized.

In order to achieve this object, a battery pack according to the present invention comprises:

And the upper end sealing portion where the electrode terminal is located is vertically bent so as to be parallel to the upper end outer wall of the electrode assembly receiving portion and the both side sealing portions adjacent to the upper end sealing portion are connected to the electrode A battery cell including a frame-shaped peripheral edge part bent vertically so as to be in close contact with a side wall of the assembly receiving part and formed by hot-melting of a hot-melt resin;

A protection circuit board (PCB) including an electrode terminal connection portion for electrically connecting the protection circuit to an electrode terminal of the battery cell, and mounted on the upper sealing portion in parallel with the upper outer wall of the electrode assembly receiving portion;

An upper case coupled to an upper portion of the PCB; And

An external label attached to the battery cell so as to surround the PCB when the PCB is mounted on the battery cell;

Lt; / RTI >

And the mounting state of the PCB mounted on the upper sealing portion of the battery cell is fixed to the battery cell by the outer edge portion.

Here, the sealing portion refers to a portion having an extra space formed on one side of the sealed outer circumferential surfaces formed when the electrode assembly is sealed in the battery case, and it is apparent to those skilled in the art that a specific portion The description is omitted.

The peripheral edge portion refers to an edge portion surrounding the outer periphery of the battery cell in place of the frame for mounting the conventional battery cell. Specifically, after the battery cell is positioned in the mold, And may be formed by a hot melt method by injecting hot melt resin into the formed discharge port.

At this time, the resin injected in the hot-meltting is not particularly limited, but it is possible to reduce the cost of the conventional hot melt type battery pack, And more specifically, it may be at least one selected from the group consisting of polyamide series resins.

The polyamide-based resin can withstand temperatures of -40 to 125 degrees Celsius, and is excellent in heat resistance and cold resistance. Since the curing time is short, the polyamide-based resin can be worked through injection, and the working time can be reduced through low- And can be used for mass production more preferably.

As described above, the battery pack according to the present invention, unlike the battery pack including the conventional pouch-shaped battery cell in which the upper sealing portion extends from the upper outer wall of the electrode assembly receiving portion to form a terrace, And the PCB is vertically bent so as to be parallel to the upper outer wall of the electrode assembly receiving part, thereby mounting the PCB on the upper sealing part.

Therefore, in one specific example, the PCB may be formed with a width and a length corresponding to the top surface of the battery cell in a plan view, and may include an external input / output terminal electrically connected to the external device on the top surface, At this time, the upper case, which is positioned at the upper end of the PCB, may have an opening to expose the external input / output terminal of the PCB.

The upper case and the PCB may be coupled in a fastening manner. More specifically, the upper case and the PCB have protrusions on the wedge structure, and the remaining one has grooves into which the protrusions are inserted, The upper case and the PCB can be coupled by the engagement of the projections and the grooves. Further, the hot melt resin may be introduced into the space between the upper case and the PCB together with the protruding portion and the coupling member such as the groove, so that the coupling between the upper case and the PCB can be further strengthened.

The outer edge portion formed by introducing the hot melt resin may surround the outer circumference of the battery cell, except the external input / output terminals located at the top of the PCB.

Specifically, in order to stably mount the PCB on the upper sealing portion of the battery cell without using a separate double-sided tape or a member such as a PCB holder, the upper outer circumferential edge portion of the outer circumferential edge portion includes an upper case, And a hot melt resin is introduced into the space between the sealing portion and the upper outer wall of the electrode assembly receiving portion. Here, the upper outer edge portion means the outer edge portion of the upper sealing portion side where the electrode terminal of the battery cell is located.

That is, since the hot melt resin is introduced into the battery pack according to the present invention such that there is no empty space on the battery pack, the mounting state of the PCB to the battery cell can be firmly and firmly mounted without using any member such as a PCM holder, .

In addition, in order to protect the battery cells from external shocks and to improve the battery capacity by the thickness of the frame without existing frames on both side surfaces existing in the existing battery cells, The side outer edge portions may have a structure in which hot melt resin is introduced into a space between the side sealing portion and the side outer wall of the electrode assembly receiving portion and hot melt is added to the outer surface of the side sealing portion, And a peripheral edge portion formed on a side surface including relatively short side edges of the upper peripheral edge portion.

Further, in order to seal the lower end of the battery cell and fix the battery cell without the lower case, the lower outer edge portion of the outer edge portion of the outer edge portion opposite to the upper outer peripheral edge portion is formed on the outer surface of the lower end outer wall of the electrode assembly receiving portion Hot melt may be added.

Therefore, the battery pack according to the present invention does not require members such as a PCM holder for mounting the PCB on the battery cell, a lower case for sealing the lower end of the battery cell, and the like, So that the battery capacity can be maximized by increasing the size of the battery cell by the volume of the omitted parts while reducing the manufacturing cost and the durability of the battery pack is improved by using the fixing structure by hot melt . In addition, as compared with the conventional frame hot melt type battery pack structure in which the frame for mounting the battery cells and the hot melt are used together, the frames on both sides of the battery cells are eliminated, The battery capacity can be improved.

In order to maximize these effects, the perimeter edge portion may, in one specific example, have a thickness of 1 to 6 mm, in particular 1 to 3 mm.

If the thickness of the outer edge portion is less than 1 mm, it is difficult to protect the battery cell from external impact, and it is difficult to fix the battery cell and the PCB. However, when the thickness of the peripheral edge is 6 mm If the thickness of the battery cell is increased, the number of stacks may increase, resulting in an internal short circuit, which is not advantageous from the standpoint of safety.

In addition, the thickness of the upper outer circumferential edge portion formed at the upper end of the battery cell among the outer circumferential edge portions may be relatively thick compared to the thickness of the outer circumferential edge portions of other portions, and may be 3 to 6 mm.

If the thickness of the upper peripheral edge portion is less than 3 mm, there is a problem that an overflow phenomenon occurs in which the hot melt resin flows out of the upper peripheral edge portion. On the other hand, when the thickness is more than 6 mm , There is a possibility that the hot melt resin is not completely filled in the upper outer circumferential edge portion, and the non-molding phenomenon may occur.

In one specific example, the battery cell may have a structure in which an electrode assembly is embedded in a case of a laminate sheet including a metal layer and a resin layer, and then an outer circumferential surface is sealed, and the battery cell may have a plate- .

In addition, the battery cell is not limited, but may be a lithium secondary battery.

The present invention also provides a device including the battery pack as a power source, and specific examples of the device include a mobile phone, a portable computer, a smart phone, a smart pad, a tablet PC, and a netbook, It is not.

As described above, the battery pack according to the present invention is vertically bent so that the upper end sealing portion where the electrode terminal of the battery cell is located is parallel to the upper end outer wall of the electrode assembly receiving portion, and the PCB Is mounted on a battery cell by a frame-shaped outer peripheral edge portion formed by hot-melting of a hot-melt resin, the PCB can be easily mounted on the upper portion of the battery cell without a separate double- So that it is possible to improve the durability and reduce the cost due to the reduction of parts. In addition, the battery pack according to the present invention has the effect of maximizing the battery capacity by securing the battery cells through the peripheral edge portion, thereby omitting the frames and the lower case on both sides of the battery cells.

1 is an exploded perspective view of a battery pack housing a conventional pouch-shaped battery cell;
2 is a perspective view illustrating a battery pack according to an embodiment of the present invention;
3 is an exploded perspective view of the battery pack of Fig. 2;
4 is a cross-sectional view schematically showing a state before attaching an external label to the battery pack of Fig. 2;
Fig. 5 is a cross-sectional view schematically showing the structure of a peripheral edge portion of the battery pack of Fig. 2;

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. 2 is a perspective view schematically showing a battery pack according to an embodiment of the present invention. FIG. 3 is a schematic exploded perspective view of the battery pack of FIG. Sectional view schematically showing a state before the external label is attached to the battery pack, and Fig. 5 is a cross-sectional view schematically showing the structure of the peripheral edge portion of the battery pack of Fig.

2 and 3, the battery pack 200 according to the present invention includes a battery cell 210, a frame-shaped outer peripheral edge portion 280 formed by hot melt-melting of a hot melt resin, A PCB 240 mounted on the upper sealing portion 261 of the battery cell 210 in parallel with the outer wall, an upper case 220 coupled to the upper portion of the PCB 240, The PCB 240 is fixed to the battery cell 210 by the outer edge portion 280 of the outer label 250 so as to surround the PCB 250 in a state where the PCB 240 is mounted.

Specifically, the battery cell 210 includes sealing portions 261 and 262 formed by thermal fusion on the outer periphery and a frame-shaped outer peripheral edge portion 280 formed by hot-melting of a hot melt resin. The electrode terminals 270 The upper sealing part 261 is vertically bent so as to be parallel to the upper end outer wall of the electrode assembly receiving part and the both side sealing parts 262 adjacent to the upper sealing part 261 are closely contacted with the outer side wall of the electrode assembly receiving part So as to be vertically bent.

That is, unlike the battery pack including the conventional pouch-shaped battery cell, the battery pack 210 according to the present invention is vertically bent such that the upper end sealing portion 261 is parallel to the upper end outer wall of the electrode assembly receiving portion, And the PCB 240 can be mounted on the PCB 261.

Accordingly, the PCB 240 is formed in a planar shape with a width and a length corresponding to the top surface of the battery cell 210, and includes an external input / output terminal 241 electrically connected to an external device on the top surface, An opening 221 is formed in the upper case 220 located at the upper end of the PCB 240 so that the external input / output terminal 241 of the PCB 240 can be exposed.

4, the battery pack 200 according to the present invention is characterized in that an outer edge portion 280 formed by the introduction of a hot melt resin is connected to an external input / output terminal The battery cell 210 is configured to surround the outer periphery of the battery cell 210 except for the openings 241.

The upper outer edge portion 280a of the PCB 240 can be stably mounted on the upper sealing portion 261 of the battery cell 210 without using a separate double-sided tape or a member such as a PCB holder. Is composed of a structure in which hot melt resin is introduced into a space between the upper case 220, the PCB 240, the upper sealing portion 261, and the upper outer wall of the electrode assembly receiving portion 211.

In other words, the battery pack 200 according to the present invention has a structure in which the hot melt resin is introduced into the battery pack 200 such that there is no empty space on the battery pack 200, The state of attachment to the cell 210 is fixed without shaking.

In addition, it is possible to protect the battery cell 210 from an external impact and to improve the battery capacity by the thickness of the frame, without the frames on both side surfaces existing in the existing battery cell, Hot melt resin is introduced into the space between the side sealing portions 262 and the side outer walls of the electrode assembly accommodating portion 211 and the hot melt is applied to the outer surface of the side sealing portions 262 .

The lower outer peripheral edge portion 280c of the battery cell 210 opposite to the upper outer peripheral edge portion 280a is formed in the lower portion of the electrode assembly 210 so as to seal the lower end of the battery cell 210 and fix the battery cell 210, And a hot melt is added to the outer surface of the lower end outer wall of the accommodating portion 211. [

Referring to FIG. 5 together with FIG. 3, in order to protect a battery cell from an external impact and stably fix a battery cell, a PCB, and the like, 280 may have a thickness T1 of 1 to 6 mm.

The thickness T2 of the upper outer circumferential edge portion 280a is larger than the thickness T1 of the outer circumferential edge portion 280 of the other portion so as to prevent overflow and non- And may be 3 to 6 mm in detail.

As described above, the battery pack according to the present invention does not require members such as a PCM holder for mounting the PCB on the battery cell, a lower case for sealing the lower end of the battery cell, and the like, The size of the battery cell can be increased by the volume of the omitted component while maximizing the capacity of the battery and the durability of the battery pack can be improved by using the fixing structure by hot melt, Lt; / RTI > In addition, as compared with the conventional frame hot melt type battery pack structure in which the frame for mounting the battery cells and the hot melt are used together, the frames on both sides of the battery cells are eliminated, The battery capacity can 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.

Claims (19)

A battery pack comprising a battery cell in which an electrode assembly is housed in an electrode assembly receiving portion,
Wherein the electrode assembly is formed by thermally welding at least a part of an outer periphery of the electrode assembly receiving portion,
The electrode assembly includes an electrode terminal extending from the electrode assembly. The electrode assembly is vertically bent in the direction of the body of the electrode assembly, parallel to the upper outer wall of the electrode assembly receiving part, An upper sealing portion in which electrode terminals are bent in parallel in the opposite direction; A side sealing part positioned on both sides of the electrode assembly receiving part adjacent to the upper sealing part and bent perpendicularly to the body of the electrode assembly so as to be in close contact with the outer side wall of the electrode assembly receiving part; A battery cell comprising a battery cell;
A protection circuit board (PCB) including an electrode terminal connection portion for electrically connecting the protection circuit to an electrode terminal of the battery cell, and mounted on the upper sealing portion in parallel with the upper outer wall of the electrode assembly receiving portion;
An upper case coupled to an upper portion of the protection circuit board;
The outer peripheral edge of the frame-like shape formed by hot-melting of a hot-melt resin formed on the outer periphery of the battery cell to which the protection circuit board and the upper case are coupled, A peripheral edge part; And
An outer label attached to surround the battery cell having the outer edge portion; Lt; / RTI >
And an upper peripheral edge portion located at an upper portion of the peripheral edge portion,
A hot melt resin is introduced into the inner space between the upper outer wall of the electrode assembly receiving part and the vertically bent upper sealing part and the inner space between the upper sealing part and the protection circuit board to which the electrode terminals bent in parallel are connected, Battery pack.
The battery pack according to claim 1, wherein the battery cell has a structure in which an electrode assembly is embedded in a case of a laminate sheet including a metal layer and a resin layer, and then an outer circumferential surface of the electrode assembly is sealed. The battery pack according to claim 1, wherein the battery cells have a rectangular plate-like rectangular shape. The battery pack according to claim 1, wherein the thickness of the peripheral edge portion is 1 to 6 mm. The battery pack according to claim 1, wherein a thickness of the upper outer circumferential edge portion formed at the upper end of the battery cell is relatively thicker than a thickness of the outer circumferential edge portion of the other circumferential edge portion. The battery pack according to claim 5, wherein the upper peripheral edge portion has a thickness of 3 to 6 mm. delete delete 2. The electrode assembly according to claim 1, wherein the outer peripheral edge portions adjacent to the upper outer peripheral edge portion of the outer edge portion have hot melt resin introduced into a space between the side sealing portion and the side outer wall of the electrode assembly receiving portion, Wherein the battery pack has a structure in which a melt is added.
The battery pack according to claim 1, wherein a lower end peripheral edge portion of the outer edge portion opposite to the upper outer peripheral edge portion is formed by adding hot melt to an outer surface of a lower end outer wall of the electrode assembly receiving portion. The battery pack according to claim 1, wherein the PCB has a width and a length corresponding to a top surface of the battery cell in plan view. The battery pack according to claim 1, wherein the PCB includes an external input / output terminal electrically connected to an external device on an upper surface thereof. 13. The battery pack according to claim 12, wherein the upper case is formed with an opening to expose an external input / output terminal of the PCB. The battery pack according to claim 1, wherein the upper case and the PCB are coupled in a fastening manner. [16] The apparatus of claim 14, wherein the upper case and the PCB have protrusions formed in a wedge structure, and the other has grooves into which the protrusions are inserted, respectively, And the PCB is coupled. The battery pack according to claim 1, wherein the resin injected in the hot melt process is one or more selected from the group consisting of a polyamide series resin. The battery pack according to claim 1, wherein the battery cell is a lithium secondary battery. A device comprising a battery pack according to any one of claims 1 to 6 and 9 to 17 as a power source.
19. The device of claim 18, wherein the device is selected from a cell phone, a portable computer, a smart phone, a smart pad, a tablet PC, and a netbook.

Images