KR20160142975A - Battery Pack Comprising Frame Member Having Hole for Welding - Google Patents

Abstract

The present invention provides a battery pack comprising at least one battery cell, a printed circuit board (PCB), a safety element, a protective circuit module (PCM) and a frame member. The battery cell has a positive terminal and a negative terminal protruding from the periphery of at least one side thereof. The PCB has a protective circuit formed thereon. The safety element is electrically connected between the electrode terminal on one side of the battery cell and the PCB or is mounted on the PCB. The PCM includes an external input/output terminal electrically connected to the protective circuit of the PCB and is electrically connected to the positive terminal and the negative terminal of the battery cell. The frame member has a battery cell mounted part where the battery cell and PCM are mounted and a PCM mounted part. The PCM mounted part has a PCM cover formed on one surface thereof in a state of being separated from the battery cell mounted part through a first separation wall. The PCM cover has a hole for welding, which is formed to electrically connect the positive terminal and the negative terminal of the battery cell with the PCM.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a battery pack having a frame member having a hole for welding,

The present invention relates to a battery pack including a frame member having a welding hole.

In recent years, the demand for environmentally friendly alternative energy sources has become an indispensable factor for the future, as the increase in the price of energy sources due to depletion of fossil fuels and the interest in environmental pollution are amplified. Various researches on power generation technologies such as nuclear power, solar power, wind power, and tidal power have been continuing, and electric power storage devices for more efficient use of such generated energy have also been attracting much attention.

Particularly, as technology development and demand for mobile devices increase, the demand for batteries as energy sources is rapidly increasing. Recently, the use of secondary batteries as a power source for electric vehicles (EV) and hybrid electric vehicles (HEV) In addition, the use area has been expanded for use as a power auxiliary power source through a grid, and accordingly, a lot of researches on a battery that can meet various demands have been conducted.

Typically, in terms of the shape of a battery, there is a high demand for a prismatic secondary battery and a pouch-type secondary battery which can be applied to products such as mobile phones with a small thickness, and has advantages such as high energy density, discharge voltage, There is a high demand for lithium secondary batteries such as lithium ion batteries and lithium ion polymer batteries.

Such a secondary battery may be used in the form of a battery pack in a state where a plurality of battery cells are mounted on a frame member and connected in series or in parallel so as to exhibit a desired capacity characteristic in a device to which the invention is applied.

1 is a schematic view schematically showing a structure in which a battery cell is mounted on a frame member constituting a conventional battery pack.

Referring to FIG. 1, the battery pack 100 includes a structure in which two battery cells 110 and 120 and one PCM 130 are mounted on one frame member 140.

The frame member 140 has a structure that entirely surrounds the outer periphery of the battery cells 110 and 120 and the PCM 130.

Two battery cell mounts 141 and 142 are formed on both sides of the frame member 140. A PCM mount 143 is formed between the battery cell mounts 141 and 142, (141, 142) and the PCM mounting portion (143) are separated by a partition wall.

The PCM 130 includes a safety element 131 on one side and an external input / output terminal 132 connected by a wire protrudes outward from the outer periphery of the frame member 140.

The battery cells 110 and 120 are electrically connected to the PCM 130 by welding with the PCM 130. The battery cells 110 and 120 are electrically connected to the PCM 130. The positive and negative terminals 111 and 121, Respectively.

However, in the course of performing such welding, a predetermined flame or non-product is generated, and the flame or non-product may damage the safety element or PCB constituting the PCM, causing a defect in the product There is a problem that the reliability of the product and the process is lowered.

In order to prevent such a problem, a method of applying an exposed portion of a PCM using an insulating polymer resin has been proposed. However, this method increases the time and cost of manufacturing the PCM, .

Therefore, there is a high need for a technique capable of fundamentally solving such problems.

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.

The inventors of the present application have conducted intensive research and various experiments and have developed a welding process for electrically connecting electrode terminals to PCM by drilling a welding hole in a PCM cover formed on one surface of a PCM mounting part, , It is possible to prevent the damage of the PCM components due to flame or non-product, and to reduce the defect rate of the product, and the additional process or configuration for protecting the PCM components is not necessary, And that the present invention has been accomplished.

According to an aspect of the present invention, there is provided a battery pack comprising:

At least one battery cell in which a positive electrode terminal and a negative electrode terminal protrude from at least one outer periphery;

A printed circuit board (PCB) on which a protection circuit is formed, a safety element electrically connected between the one side electrode terminal of the battery cell and the PCB or mounted on the PCB, and a protection circuit electrically connected to the protection circuit of the PCB A protective circuit module (PCM) including an external input / output terminal and electrically connected to the positive and negative terminals of the battery cell; And

A frame member having a battery cell mounting portion and a PCM mounting portion on which the battery cell and the PCM are mounted, respectively;

And,

The PCM mounting part is divided into a battery cell mounting part and a first bank, a PCM cover is formed on one surface,

The PCM cover may have a structure in which a welding hole for electrically connecting the positive terminal and the negative terminal of the battery cell to the PCM is perforated.

Therefore, since the welding of the electrode terminal to the PCM is performed through the hole for the penetration of the PCM cover, it is possible to prevent the damage of the PCM components by the flame or the non-product during the welding process, And it is possible to save the cost and time required for the production of the product since no additional process or configuration for protecting the PCM components is required.

In one specific example, the battery cell is stably mounted on the battery cell mounting portion of the frame member, and the positive electrode terminal and the negative electrode terminal protrude from one side to the outside, and the electrical connection to the PCM is easily performed by welding The structure is not limited to a large extent, and in particular, it may be a plate-like structure in which an electrode assembly is sealed in a laminate sheet including a resin layer and a metal layer.

The positive electrode terminal and the negative electrode terminal of the battery cell protrude from the same outer periphery of the battery cell, respectively, and the PCM mounting portion may be located at a portion corresponding to the positive and negative terminals of the battery cell.

Therefore, the electrical connection between the battery cell and the PCM through the positive terminal and the negative terminal can be more easily performed, and the battery pack can be constructed with a simplified structure.

Meanwhile, the frame member may have a structure that surrounds the battery cells and the outer periphery of the PCM, and may have a structure in which one surface of the battery cell and the other surface facing the battery cell are opened. And the opposed portions may be opened.

In other words, the frame member is configured so as to surround only the outer periphery of the battery cells and the PCM as a whole except for the PCM cover formed on one side of the PCM mounting portion. Accordingly, the battery cells and the PCM, It can be easily mounted on each mounting portion of the member.

In addition, the height of the first bank dividing the PCM mounting part and the battery cell mounting part may be 50% to 120% of the thickness of the battery cell.

If the height of the first bank is less than 50% of the thickness of the battery cell, the battery cells and the PCM mounted on the battery cell mounting part and the PCM mounting part may not be stably fixed at desired positions.

On the other hand, when the height of the first bank is greater than 120% of the thickness of the battery cell, the first bank is excessively protruded compared to other portions of the frame member, so that the outer surface of the battery pack can not be uniformly formed , The battery pack can not be stably mounted in a limited space of the device.

In one specific example, the first bank may have a structure in which the electrode terminal protruding grooves are formed so that the positive and negative terminals of the battery cell protrude outward in the PCM direction.

That is, the positive electrode terminal and the negative electrode terminal of the battery cell can be more easily protruded in the PCM direction adjacent to the electrode terminal protrusion groove formed in the first bank.

At this time, the positive electrode terminal and the negative electrode terminal may be positioned between the PCM and the PCM cover in a state protruding in the PCM direction.

Specifically, a welding hole is formed in one side of the PCM mounting part on which the PCM is mounted, and electrical connection between the positive terminal and the negative terminal of the battery cell and the PCM can be performed through a welding hole.

Therefore, the positive electrode terminal and the negative electrode terminal may protrude in the PCM direction and may be exposed to the outside through the hole for welding formed in the PCM cover by being positioned between the PCM and the PCM cover.

In order to achieve the above-described structure, the welding hole may be formed such that a portion where the positive and negative terminals of the battery cell and the PCM are connected is exposed to the outside.

Meanwhile, the PCM mounting part may have a structure in which a second partition wall that surrounds the outer periphery of the safety device protrudes from the PCM cover in a direction in which the PCM is positioned.

Specifically, the PCM may include a safety element electrically connected to one side of a battery cell and a PCB or mounted on the PCB. More specifically, the safety element may be mounted on one side of the PCB .

At this time, the safety element may be positioned between one side of the PCB and the PCM cover in the process of mounting the PCM on the PCM mounting part, Can be formed.

Therefore, the welded hole formed in the PCM cover can communicate with the space formed between the PCM cover and the PCB, so that the flame or non-product generated in the welding process through the welding hole can be communicated through the communicated space , The PCM components, including the safety element, may be damaged, thereby damaging the PCM components, such as the safety element.

However, in the PCM mounting portion, a second partition wall having a structure for surrounding the outer periphery of the safety element is protruded from the PCM cover in a direction in which the PCM is positioned, so that the safety element can be safely protected by the second partition, It is possible to prevent damage due to flame or non-product generated in the welding process of the electrode terminal.

To this end, the height of the second bank may be the same as the distance from the PCM cover to the PCM.

If the height of the second partition wall is smaller than the distance from the cover to the PCM, the safety element can not be completely protected from flames or artefacts generated during the welding process, and the height of the second partition wall The second partition wall is excessively protruded relative to other portions of the frame member so that the outer surface of the battery pack can not be formed uniformly and the battery pack can not be formed in a limited space It can not be stably mounted on the vehicle.

A third partition wall having a structure protruding from the PCM cover in the PCM direction may be formed in the inner periphery of the welding hole.

As described above, the welded holes formed in the PCM cover can be connected to the space formed between the PCM cover and the PCB, so that the flame or non-product generated in the welding process through the hole for welding can pass through the space, May be contacted with PCM components, including safety elements, thereby damaging PCM components, such as the safety element.

Therefore, the battery pack according to the present invention includes a third partition wall having a structure that surrounds the inner periphery of the welding hole, in addition to the second partition wall having a structure surrounding the outer periphery of the safety element, It is possible to prevent the safety element from being damaged.

That is, the second and third barrier ribs may have the same or similar effect, and may be formed together with the PCM mount of the frame member, or may be selectively formed.

In this case, the height of the third bank may be the same as the height from the PCM cover to the PCM, like the height of the second bank.

In addition, the distance from the PCM cover to the PCM may be between 100% and 800% of the thickness of the PCM.

If the distance from the PCM cover to the PCM is less than 100% of the thickness of the PCM, the depth of the welding hole is excessively small, so that the flame or non-product generated in the welding process is scattered to the outside of the welding hole, If the thickness exceeds 800%, the depth of the welding hole is too deep, and welding of the electrode terminal to the PCM can not be easily performed through the welding hole. have.

In one specific example, the external input / output terminal may be connected to the PCB by a wire and protrude outward from the outer periphery of the frame member.

According to the structure, the external input / output terminal can be electrically connected to the external device more easily without restriction on the position of the battery pack.

At this time, a U-shaped groove may be formed in an outer peripheral portion of the frame member where the external input / output terminal protrudes.

Therefore, the external input / output terminal can be more easily protruded from the outer periphery of the frame member in the process of mounting the PCM on the PCM mounting portion of the frame member.

However, the structure of the external input / output terminal is not limited thereto, and the structure of the external input / output terminal is not limited as long as the battery pack can easily be electrically connected to the external device.

The present invention also provides a device including the battery pack as a power source, wherein the device is used in a mobile phone, a tablet computer, a notebook computer, a power tool, a wearable electronic device, an electric vehicle, a hybrid electric vehicle, a plug- , And a power storage device.

Since the devices are well known in the art, a detailed description thereof will be omitted herein.

As described above, in the battery pack according to the present invention, in the welding process for electrical connection of the electrode terminals to the PCM, by punching the welding holes in the PCM cover formed on one surface of the PCM mounting portion, It is possible to prevent the damage of the PCM components and to reduce the defective rate of the product, and there is no need of additional process or configuration for protecting the PCM components, and the effect of saving the cost and time for production of the product have.

1 is a schematic view showing a structure in which a battery cell is mounted on a frame member constituting a conventional battery pack;
2 is a schematic view illustrating a top surface structure of a battery pack according to an embodiment of the present invention;
3 is a schematic view schematically illustrating a bottom structure of a battery pack according to an embodiment of the present invention;
4 is a schematic view schematically showing a structure of a PCM mounting part of the frame member of Fig. 3;
5 is a vertical sectional view taken along line A-A 'in Fig.

Hereinafter, the present invention will be described in detail with reference to the drawings according to the embodiments of the present invention, but the scope of the present invention is not limited thereto.

2 and 3 are schematic views schematically showing the top and bottom structures of the battery pack according to one embodiment of the present invention;

Referring to FIGS. 2 and 3, the battery pack 200 has a structure in which two battery cells 210 and 220 and one PCM 230 are mounted on one frame member 240.

The frame member 240 has a structure that entirely surrounds the battery cells 210 and 220 and the outer periphery of the PCM 230 and has a structure in which the top and bottom surfaces of the battery cells 210 and 220 are opened .

Four fixing portions 246a, 246b, 246c, and 246d are formed on the outer periphery of the frame member 240 to fix the battery pack 200 to the external device.

The battery cells 210 and 220 are mounted on the battery cell mounting portions 241 and 242 formed on both sides of the frame member 240 and are mounted on the PCM mounting portion 243 formed between the battery cell mounting portions 241 and 242, The PCM 230 is mounted.

The PCM 230 protrudes outward through a U-shaped groove formed in a corresponding outer peripheral portion of the frame member 240 by an external input / output terminal 231 connected by a wire 232.

A PCM cover 244 is formed on the upper surface of the PCM mounting portion 243, and a lower surface opposed to the PCM cover 244 has an open structure.

Four welding holes 245a, 245b, 245c, and 245d are formed in the PCM cover 244 to expose the connection sites of the electrode terminals of the battery cells 210 and 220 and the PCM 230 to the outside.

4 is a schematic view schematically showing the PCM mounting structure of the frame member of Fig.

Referring to FIG. 4, the PCM mounting portion 243 is located between the two battery cell mounting portions 241, 242.

The PCM mounting part 243 is divided by the battery cell mounting parts 241 and 242 and the first partitions 251a and 251b and the positive and negative terminals of the battery cells are connected to the first partitions 251a and 251b by PCM Electrode terminal protruding grooves 261a, 261b, 261c, and 261d are formed so as to protrude outward in the direction of the electrode terminal protrusion.

The PCM mounting portion 243 is formed with second barrier ribs 252a, 252b and 252c having a structure to surround the outer periphery of the safety element and the third barrier ribs 252a, 252b and 252c are formed around the inside of the welding holes 245a, 245b, 245c and 245d. 253a, and 253b are formed.

Accordingly, when the electrode terminals of the battery cells are welded to the PCM through the welding holes 245a, 245b, 245c, and 245d, damage to the safety device due to flame or non-product generated by the welding can be prevented.

5 is a vertical sectional view taken along line A-A 'of FIG.

Referring to FIG. 5, a PCM cover 244 is formed on the upper surface of the PCM mounting part, and the PCM 230 is mounted on the opened lower surface.

The positive terminals 221 and the negative terminals 211 and 212 of the battery cells are located between the PCM 230 and the PCM cover 244 and the positive terminals 221 and 222 of the battery cells are connected to the PCM cover 244. [ 245b, 245c, and 245d are drilled to expose portions where the cathode terminals 222 and 222 and the cathode terminals 211 and 212 and the PCM 230 are connected to the outside.

The PCM mounting portion 243 is provided with second partition walls 252a, 252b and 252c having a structure for surrounding the outer periphery of the safety elements 233a and 233b in a direction in which the PCM 230 is located from the PCM cover 244, Third partition walls 253a and 253b having a structure protruding from the PCM cover 244 toward the PCM 230 are formed in the inner periphery of the welding holes 245a, 245b, 245c and 245d.

The heights of the second bank 252a, 252b and 252c and the third bank 253a and 253b are the same as the distance from the PCM cover 244 to the PCM 230.

Therefore, the safety elements 233a and 233b of the PCM 230 are completely isolated from the welding holes 245a, 245b, 245c and 245d, and accordingly the electrode terminals 211, 212, 221, 222 may be welded to the PCM 230, the safety element may be prevented from being damaged due to the spark or non-product 270 generated by the welding.

In addition, since it is not necessary to apply an insulating polymer resin or the like on the PCM 230 in order to prevent the PCM 230 from being damaged by the flame or non-product 270, cost and time Can be saved.

The external input / output terminal 231 is protruded outward through a U-shaped groove 247 formed in a corresponding outer peripheral portion of the frame member in a state where the external input / output terminal 231 is connected to the PCM 230 by the wire 232.

Accordingly, the external input / output terminal 231 can be more easily protruded from the outer periphery of the frame member in the process of mounting the PCM 230 on the PCM mounting portion.

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)

At least one battery cell in which a positive electrode terminal and a negative electrode terminal protrude from at least one outer periphery;
A printed circuit board (PCB) on which a protection circuit is formed, a safety element electrically connected between the one side electrode terminal of the battery cell and the PCB or mounted on the PCB, and a protection circuit electrically connected to the protection circuit of the PCB A protective circuit module (PCM) including an external input / output terminal and electrically connected to the positive and negative terminals of the battery cell; And
A frame member having a battery cell mounting portion and a PCM mounting portion on which the battery cell and the PCM are mounted, respectively;
And,
The PCM mounting part is divided into a battery cell mounting part and a first bank, a PCM cover is formed on one surface,
Wherein the PCM cover is formed with a welding hole for electrical connection between the positive terminal and the negative terminal of the battery cell and the PCM. The battery pack according to claim 1, wherein the battery cell comprises a plate-like structure in which an electrode assembly is sealed in a laminate sheet including a resin layer and a metal layer. The battery pack according to claim 1, wherein the positive electrode terminal and the negative electrode terminal of the battery cell protrude from the same outer periphery of the battery cell. The battery pack according to claim 1, wherein the PCM mounting portion is located at a portion corresponding to the positive terminal and the negative terminal of the battery cell. The battery pack according to claim 1, wherein the frame member has a structure that surrounds the battery cells and the outer periphery of the PCM, and has a structure in which one surface of the battery cells and the other surface facing the battery cells are opened. The battery pack according to claim 1, wherein the frame member has a structure in which a portion facing the PCM cover is opened in the PCM mounting portion. The battery pack according to claim 1, wherein the height of the first bank is about 50% to 120% of the thickness of the battery cell. The battery pack according to claim 1, wherein an electrode terminal protrusion groove is formed in the first bank so that the positive terminal and the negative terminal of the battery cell can be protruded outward in the PCM direction. The battery pack according to claim 8, wherein the positive electrode terminal and the negative electrode terminal protrude in the PCM direction and are located between the PCM and the PCM cover. The battery pack according to claim 1, wherein the welding hole is formed such that a portion where a positive terminal and a negative terminal of the battery cell are connected to a PCM is exposed to the outside. The battery pack according to claim 1, wherein a second partition wall having a structure surrounding the outer periphery of the safety element protrudes from the PCM cover in a direction in which the PCM is placed. 12. The battery pack according to claim 11, wherein a height of the second partition wall is equal to a distance from the cover to the PCM. The battery pack according to claim 1, wherein a third partition wall having a structure protruding from the PCM cover in the PCM direction is formed in the inner periphery of the welding hole. 14. The battery pack according to claim 13, wherein a height of the third partition wall is equal to a distance from the PCM cover to the PCM. 15. The battery pack according to claim 12 or 14, wherein the distance from the PCM cover to the PCM is 100% to 800% of the thickness of the PCM. The battery pack according to claim 1, wherein the external input / output terminal is connected to the PCB by a wire, and protrudes outward from an outer periphery of the frame member. 17. The battery pack according to claim 16, wherein a U-shaped groove is formed in an outer peripheral portion of the frame member from which the external input / output terminal protrudes. A device comprising the battery pack according to claim 1 as a power source. 19. The device of claim 18, wherein the device is selected from the group consisting of a cell phone, a tablet computer, a notebook computer, a power tool, a wearable electronic device, an electric vehicle, a hybrid electric vehicle, a plug- . ≪ / RTI >

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