KR100719724B1 - Battery pack - Google Patents

Abstract

The present invention relates to a battery pack, and a technical problem to be solved is to prevent damage to the protection circuit board due to electrolyte leakage.

To this end, the gist of the solution according to the present invention is a first case having a first partition having a predetermined length, a second case having a second partition having a predetermined length coupled to the first partition, and one side of the first and second partitions. And at least one battery cell sealed by the first and second cases, and a protection circuit board which is isolated from the battery cell as the other side of the first and second partition walls and sealed by the first and second cases. The pack is initiated.

Battery pack, battery cell, leakage, electrolyte, protective circuit board, bulkhead

Description

Battery pack {Battery pack}

1 is a perspective view showing a battery pack according to the present invention.

2A is a perspective view illustrating a state in which a second case is separated from a first case of a battery pack according to the present invention, FIG. 2B is a plan view thereof, and FIG. 2C is a first case, a battery cell and a protective circuit board, and a second case. Is a plan view showing a separated state.

3A and 3B are cross-sectional views illustrating a state in which the first and second partition walls formed in the first and second cases of the battery pack according to the present invention are coupled to each other.

4A and 4B are cross-sectional views illustrating a state in which first and second partition walls of different shapes formed in first and second cases of a battery pack according to the present invention are coupled to each other.

5A and 5B are cross-sectional views illustrating a state in which a cell flow preventing wall of the battery pack is interposed between battery cells.

<Description of Symbols for Main Parts of Drawings>

100; Battery pack according to the present invention

110; First case 111; Front page

112; First side wall 113; First bulkhead

120; Second case 121; The second page

122; Second sidewall 123; 2nd bulkhead

124; Cell flow barrier 130; Battery cell

140; Protective circuit board 141; connector

150; Wiring 160; Silicon layer

The present invention relates to a battery pack, and more particularly, to a battery pack capable of preventing damage to a protection circuit board caused by electrolyte leakage.

In general, battery packs used in portable electronic devices such as notebooks, personal digital assistants (PDAs), and camcorders are manufactured by tying several battery cells together because of capacity limitations of battery cells.

The battery pack includes a first case, a plurality of battery cells housed in the first case, a protection circuit board electrically connected to the battery cells to control their charge and discharge states, and covering the first case. And a second case for protecting the battery cell and the protection circuit board from the external environment. Here, the battery cell may be a high capacity cylindrical lithium ion battery. In addition, such battery packs are mounted on notebook computers, PDAs (Personal Digital Assistants), camcorders, and the like, to supply them with a predetermined power source or to be connected to a charger for charging.

By the way, the battery cell of such a battery pack may leak the internal electrolyte solution to the exterior for some reason (welding failure, a defective exterior material, or a tear of the exterior material). In particular, when the battery cell is a lithium ion battery series, a material that is mainly organic electrolyte and highly flammable is used as the electrolyte.

On the other hand, in the conventional battery pack, as described above, the battery cell and the protection circuit board are housed together in the first case without being physically isolated. Therefore, when the electrolyte is leaked from the battery cell as described above, the electrolyte may immediately damage the protective circuit board due to its characteristics. That is, the protective circuit board mainly consists of an insulating resin, a copper pattern, a plurality of semiconductor devices, and the like, and these components are easily damaged or broken by the leaked electrolyte.

As such, damage to or damage to the components of the protection circuit board may result in a more dangerous situation such as overcharging or overdischarging of a battery cell. Therefore, it is good to prevent the electrolyte leaked from the battery cell to flow to the protective circuit board in any way. However, a structure for preventing the leakage of electrolyte from flowing into the protective circuit board is not yet known.

Furthermore, the conventional battery pack is housed together in the first case with a plurality of battery cells connected in series or in parallel as described above. However, the width of the first case is usually slightly larger than the width of the battery cells. That is, the width of the first case is slightly larger than that of the battery cell in order to easily accommodate a plurality of battery cells in the first case. However, as the width of the first case is slightly larger than the width of the battery cells, the battery cells move slightly inside the first case. In addition, various noises are likely to occur due to the movement of the battery cells, and in some cases, the wires electrically connecting the battery cells by flow shock or the wires electrically connecting the battery cells and the protection circuit board are opened or shorted. There is also a problem.

The present invention is to overcome the above-mentioned conventional problems, an object of the present invention is to provide a battery pack that can prevent damage to the protective circuit board by the electrolyte leakage.

Another object of the present invention to provide a battery pack that can suppress the flow of the battery cell to prevent noise, opening and short of the wiring.

In order to achieve the above object, a battery pack according to the present invention includes a first case having a first partition having a predetermined length, a second case having a second partition having a predetermined length coupled to the first partition, and the first case. At least one battery cell that is one side of the second partition and is sealed by the first and second cases, and is isolated from the battery cell as the other side of the first and second partitions and simultaneously sealed by the first and second cases And a protective circuit board.

Here, the first case includes a first surface having a predetermined area and a first side wall formed in an upward direction along a circumference of the first surface, and parallel to or in an area spaced a predetermined distance from the first side wall. The first partition wall may be formed in a vertical direction.

In addition, the second case includes a second surface having a predetermined area and a second side wall formed in a downward direction along a circumference of the second surface, and parallel to or in an area spaced a predetermined distance from the second side wall. The second partition wall may be formed in a vertical direction.

In addition, the first and second partitions may be formed in a concave-convex shape to be engaged with each other.

In addition, a silicon layer having a predetermined thickness may be further formed on a surface of the first and second partition walls so that the first partition wall is adhered to the second case and the second partition wall is adhered to the first case.

In addition, a cell flow preventing wall of a predetermined length may be further formed in a portion corresponding to a boundary between battery cells in the first case or the second case.

As described above, in the battery pack according to the present invention, the protective circuit board electrically connected to the battery cell is almost completely isolated from the battery cell by the first and second barrier ribs and the silicon layer. Therefore, even if the electrolyte leaks from the battery cell for some reason, the leaked electrolyte does not flow to the protection circuit board. Of course, damage or breakage of the protection circuit board is prevented in this way.

In addition, as described above, the battery pack according to the present invention further prevents the flow of the battery cells by further forming a cell flow preventing wall in a predetermined space between the battery cells and the battery cells. Therefore, the noise caused by the flow of the battery cells can be suppressed, and the opening and the short phenomenon of the wiring can be prevented.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings such that those skilled in the art may easily implement the present invention.

1, a battery pack according to the present invention is shown as a perspective view.

As shown, the battery pack 100 according to the present invention includes a first case 110 and a second case 120 coupled to the first case 110. In addition, a connector 141 connected to an external set or a charger is exposed through a predetermined region of the first case 110 (or the second case 120).

Referring to FIG. 2A, a perspective view of a state in which a second case is separated from a first case of a battery pack according to the present invention is illustrated. Referring to FIG. 2B, a plan view thereof is illustrated. Referring to FIG. The top view of the case, the battery cell and the protective circuit board, the second case is separated.

As shown, the battery pack 100 according to the present invention is electrically connected to the first case 110, the second case 120, at least one battery cell 130, and the battery cell 130. In this case, the protection circuit board 140 is almost insulated.

First, the first case 110 is provided in a substantially rectangular shape and has a first surface 111 having a predetermined area, and the first side 111 has a first side wall having a predetermined height in an upward direction along the circumference thereof. 112 is formed. Of course, the first side wall 112 also has a substantially rectangular line shape. In addition, the first case 110 is formed with a first partition wall 113 having a predetermined length and a predetermined height in a predetermined region of the first surface 111. The first partition wall 113 is formed parallel to or perpendicular to the first side wall 112. In addition, although the first partition wall 113 is all separated from the first side wall 112 in the drawing, the first partition wall 113 may be connected to the first side wall 112. In addition, the first partition wall 113 may be interposed in a gap S1 having a predetermined size formed between the battery cell 130 and the protection circuit board 140.

The second case 120 is also substantially rectangular in shape and has a second surface 121 having a predetermined area, and the second surface 121 has a second side wall having a predetermined height in a downward direction along the circumference thereof. 122) is formed. Of course, the second side wall 122 also has a substantially rectangular line shape. In addition, the second case 120 is formed with a second partition 123 having a predetermined length and height in a predetermined region of the second surface 121. The second partition wall 123 is formed parallel to or perpendicular to the second side wall 122. In addition, although the second partition 123 is connected to the second side wall 122 in the drawing, the second partition 123 may not be connected to the second side wall 122. In addition, although the second partition 123 will be described in detail below, the second partition 123 has a shape that is substantially coupled with the first partition 113 to mechanically separate the battery cell 130 and the protection circuit board 140. Do it.

In addition, at least one cell flow preventing wall 124 having a predetermined length and a predetermined height is further formed on the second surface 121 of the second case 120. The cell flow preventing wall 124 is interposed in a gap S2 having a predetermined size existing between the battery cell 130 and the battery cell 130, thereby preventing the flow of the battery cell 130. . Of course, the cell flow preventing wall 124 prevents the flow of the battery cell 130, thereby preventing opening or shorting of the wiring 150 (or the lead plate) connected to the battery cell 130. In addition, although the cell flow preventing wall 124 is illustrated as being connected to the second side wall 122 or the second partition wall 123, the cell flow preventing wall 124 may not be connected to the other side. In addition, although the cell flow preventing wall 124 is in the form of a long line, it may be formed in a plurality of irregularities, and the cell flow preventing wall 124 is not limited to a specific form.

Subsequently, the battery cell 130 is sealed by the first case 110 and the second case 120 as described above. In addition, since the battery cells 130 form the first and second side walls 112 and 122 of the first and second cases 110 and 120 and the first and second partition walls 113 and 123 to surround the periphery in a substantially rectangular line shape. The protective circuit board 140 is mechanically isolated from the protective circuit board 140. More specifically, a predetermined gap S1 is formed between the battery cell 130 and the protection circuit board 140. The first and second partitions 113 and 123 are interposed in the gap S1, whereby the battery cell 130 is formed. ) And the protection circuit board 140 are almost isolated mechanically. Therefore, even if the electrolyte is leaked from the battery cell 130 for any reason, the probability that the electrolyte penetrates the protective circuit board 140 is reduced. In addition, as described above, a predetermined gap S2 is formed between the battery cell 130 and the battery cell 130, and the cell flow preventing wall 124 is interposed in the gap S2, whereby the battery cell 130 is formed. ) Is almost prevented. Reference numeral 131 in the figure is a tape adhered to the surface of the battery cells 130 to prevent the flow between the battery cells 130.

Finally, the protection circuit board 140 is located in an area surrounded by the first and second side walls 112 and 122 and the first and second partition walls 113 and 123 of the first and second cases 110 and 120. That is, referring to FIG. 2B, the protection circuit board 140 is positioned on the right side of the first and second partitions 113 and 123, and the battery cell 130 is located on the left side of the barrier ribs 113 and 123. In addition, the protection circuit board 140 and the battery cell 130 are electrically connected to each other by a plurality of wires 150. Since the wiring 150 is very thin, a small gap or second case formed between the first partition wall 113 of the first case 110 and the second surface 121 of the second case 120 is formed. The battery cell 130 and the protection circuit board 140 are electrically connected to each other through a small gap formed between the second partition 123 of the 120 and the first surface 111 of the first case 110. Of course, such a small gap between the first partition wall 113 and the second surface 121 and the second partition wall 123 and the first surface 111 is completely blocked by the silicon layer described below. That is, the first and second barrier ribs 113 and 123 and the silicon layer allow the protection circuit board 140 and the battery cell 150 to be completely isolated mechanically.

3A and 3B, a state in which the first and second partition walls formed in the first and second cases of the battery pack according to the present invention are coupled to each other is illustrated. This figure is an example of the first and second partitions shown in Figs. 2a to 2c.

As illustrated, a first partition wall 113 having a predetermined height and length is formed on the first surface 111 of the first case 110. In addition, a second partition 123 having a predetermined height and length is formed under the second surface 121 of the second case 120. Here, the first partition wall 113 is formed at a position corresponding to the area S3 between the second partition wall 123, whereby the first partition wall 113 is formed between the second partition wall 123. It is shaped to be coupled to the region S3. In addition, the first and second partitions 113 and 123 are formed to have a height corresponding to a thickness of approximately 50 to 99% of the total height of the first and second side walls 112 and 122 of the first and second cases 110 and 120. have. Therefore, when the first partition 113 and the second partition 123 are coupled to each other, the second surface 121 of the first partition 113 and the second case 120, and the second partition wall ( There is almost no gap between 123 and the first surface 111 of the first case 110.

In addition, the first case 110 and the second case 120 are coupled to the surface of the first partition wall 113 and the first surface 111 at a position substantially corresponding to the second partition wall 123. Before the silicon layer 160 of a predetermined thickness is further formed. Of course, on the contrary, the silicon layer 160 having a predetermined thickness may be formed on the surface of the second partition 123 and the second surface 121 corresponding to the first partition 113. That is, the present invention does not limit the formation position of the silicon layer 160 to the first case 110 or the second case 120.

In this manner, after the first case 110 and the second case 120 are coupled, the first partition wall 113 of the first case 110 is formed of the second case 120 by the silicon layer 160. It is bonded to the second surface 121 of the. In addition, the second partition wall 123 of the second case 120 is bonded to the first surface 111 of the first case 110 by the silicon layer 160. Of course, the gap between the first and second barrier ribs 113 and 123 is also located by the silicon layer 160, so that the first and second barrier ribs 113 and 123 are also bonded to each other.

Accordingly, it can be seen that the battery cell 130 and the protection circuit board 140 are completely isolated mechanically by the first and second barrier ribs 113 and 123 and the silicon layer 160. Therefore, even if the electrolyte leaks from the battery cell 130, the electrolyte does not flow toward the protection circuit board 140, and as a result, the protection circuit board 140 is not damaged or damaged.

4A and 4B are cross-sectional views illustrating a state in which first and second partition walls of different shapes formed in first and second cases of a battery pack according to the present invention are coupled to each other.

As shown, the first partition wall 113 having a predetermined height and length may be formed in a plurality of irregularities on the first surface 111 of the first case 110. Of course, the second partition wall 123 having the predetermined height and length may be formed in a plurality of irregularities even under the second surface 121 of the second case 120. Of course, the first and second partition walls 113 and 123 having a plurality of irregularities may be coupled to each other. That is, one first partition 113 may be coupled to a gap S4 formed between two second partitions 123, and one second partition 123 may be two first partitions 113. It can be coupled to the gap (S5) formed between the). In addition, a silicon layer 160 having a predetermined thickness is formed between the surface of the first partition 113 having the uneven shape and the surface of the second partition 123, such that the battery cell 130 and the protective circuit board 140 are formed. This is to be completely isolated. Of course, the silicon layer 160 is also formed between the first partition wall 113 and the second partition wall 123, thereby bonding the first partition wall 113 and the second partition wall 123 to each other.

5A and 5B, a state in which a cell flow preventing wall of a battery pack according to the present invention is interposed between battery cells is illustrated.

As illustrated, the cell flow preventing wall 124 of a predetermined length is formed in the lower direction of the second surface 121 of the second case 120. In addition, the cell flow preventing wall 124 corresponds to a position S2 formed between the battery cells 130. Therefore, the cell flow preventing wall 124 is easily coupled to the gap S2 formed between the battery cells 130. Meanwhile, although the cell flow preventing wall 124 is illustrated as being formed only on the second surface 121 of the second case 120 in the drawing, the cell flow preventing wall 124 is also formed on the first surface 111 of the first case 110. Can be. Of course, the cell flow preventing wall 124 may be formed only on the first surface 111 of the first case 110.

In addition, the cell flow preventing wall 124 is preferably formed within about 10 to 50% of the diameter of the battery cell 130. That is, when the height of the cell flow preventing wall 124 is formed to be about 10% or less of the diameter of the battery cell 130, the battery cell 130 may easily ride over the cell flow preventing wall 124. . That is, the flow preventing wall 124 does not properly block the flow state of the battery cell 130.

In addition, when the height of the cell flow preventing wall 124 is about 50% or more of the diameter of the battery cell 130, the wiring 150 in which the cell flow preventing wall 124 is welded to the battery cell 130 ( Or lead plates).

In this way, the cell flow preventing wall 124 prevents the flow between the battery cells 130, and thus can prevent the noise caused by the flow of the battery cells 130. In addition, since the movement of the battery cell 130 is actively prevented, opening or shorting of the wiring 150 is also prevented.

As described above, in the battery pack according to the present invention, the protective circuit board electrically connected to the battery cell is almost completely isolated from the battery cell by the first and second barrier ribs and the silicon layer. Therefore, even if the electrolyte leaks from the battery cell for some reason, the leaked electrolyte does not flow to the protection circuit board. Of course, damage or breakage of the protection circuit board is prevented in this way.

In addition, as described above, the battery pack according to the present invention further prevents the flow of the battery cells by further forming a cell flow preventing wall in a predetermined space between the battery cells and the battery cells. Therefore, the noise caused by the flow of the battery cells can be suppressed, and the opening and the short phenomenon of the wiring can be prevented.

What has been described above is just one embodiment for carrying out a battery pack according to the present invention, and the present invention is not limited to the above-described embodiment, and the present invention deviates from the gist of the present invention as claimed in the following claims. Without this, anyone skilled in the art to which the present invention pertains will have the technical spirit of the present invention to the extent that various modifications can be made.

Claims (21)

A first case in which a plurality of first partition walls are formed; A second case having at least one second partition wall coupled to the first partition wall; At least one battery cell surrounded by the first and second partition walls and sealed by the first case and the second case; And, And a protective circuit board which is isolated from the battery cell by the first partition wall and the second partition wall and is sealed by the first case and the second case. The method of claim 1, wherein the first case A first surface having a predetermined area, A first side wall formed in an upward direction along a circumference of the first surface, The battery pack, characterized in that the first partition wall is formed in a parallel or vertical direction to the area spaced a predetermined distance from the first side wall. The method of claim 1, wherein the second case A second surface having a predetermined area, A second side wall formed in a downward direction along a circumference of the second surface, And the second partition wall is formed in a region spaced apart from the second side wall by a predetermined distance in a direction parallel or perpendicular thereto. The battery pack as claimed in claim 2, wherein the first partition wall is connected to the first side wall. The battery pack as claimed in claim 3, wherein the second partition wall is connected to the second side wall. The battery pack as claimed in claim 1, wherein the first and second barrier ribs are formed in an uneven form and are interlocked with each other. The method of claim 1, wherein a silicon layer having a predetermined thickness is further formed on a surface of the first and second partition walls, wherein the first partition wall is bonded to the second case and the second partition wall is attached to the first case. Battery pack. The method of claim 1, wherein the first case includes a first surface having a predetermined area and a first side wall formed in an upper direction along a circumference of the first surface, The first partition wall is formed in a direction parallel or perpendicular thereto, and the second case includes a second surface having a predetermined area and a second side wall formed in a lower direction along a circumference of the second surface. The battery pack, characterized in that the second partition wall is formed in a direction parallel to or perpendicular to it in a region spaced a predetermined distance from the two side walls. The battery pack as claimed in claim 8, wherein the first partition wall has a height of approximately 50 to 99% of the total height of the first side wall of the first case and the second side wall of the second case. The battery pack as claimed in claim 8, wherein the second partition wall has a height of approximately 50 to 99% of the total height of the first side wall of the first case and the second side wall of the second case. The method of claim 8, wherein a silicon layer is formed on a surface of the first and second partitions, the first partition is adhered to the first surface of the first case, the second partition is attached to the second surface of the second case A battery pack, characterized in that bonded. The battery pack as claimed in claim 1, wherein a gap of a predetermined distance is formed between the battery cell and the protection circuit board, and the first and second partitions are interposed therebetween. The battery pack as claimed in claim 1, wherein the first case further includes a cell flow preventing wall having a predetermined length at a portion corresponding to a boundary between battery cells. The battery pack as claimed in claim 1, wherein the second case further includes a cell flow preventing wall formed at a portion corresponding to a boundary between the battery cells. The battery pack as claimed in claim 1, wherein the first and second cases are further provided with a cell flow preventing wall having a predetermined length at a portion corresponding to a boundary between the battery cells. The battery pack as claimed in claim 13, wherein the cell flow preventing wall is connected to a first partition wall or a first side wall. 15. The battery pack of claim 14, wherein the cell flow preventing wall is connected to a second partition wall or a second side wall. The battery pack according to any one of claims 13 to 16, wherein the cell flow preventing wall is formed within 10 to 50% of a diameter of the battery cell. The battery pack according to any one of claims 13 to 16, wherein a gap of a predetermined distance is formed between the battery cells, and a cell flow preventing wall is interposed therebetween. The battery pack as claimed in claim 1, wherein the protection circuit board is provided with a connector coupled to an external set or a charger, and the connector is exposed to the outside through the first case. The battery pack as claimed in claim 1, wherein the battery cell and the protection circuit board are interconnected with each other.

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