CN111600082B

CN111600082B - Battery pack

Info

Publication number: CN111600082B
Application number: CN202010092276.2A
Authority: CN
Inventors: 王汉准; 金泰元
Original assignee: Samsung SDI Co Ltd
Current assignee: Samsung SDI Co Ltd
Priority date: 2019-02-21
Filing date: 2020-02-14
Publication date: 2023-08-01
Anticipated expiration: 2040-02-14
Also published as: KR20200102184A; CN111600082A

Abstract

A battery pack is provided. The battery pack includes: at least two battery cells; a label sheet comprising an adhesive surface facing the at least two battery cells and an outer surface on a side facing away from the at least two battery cells, the label sheet extending across and bonding the at least two battery cells together; and a release paper block attached to the adhesive surface of the label sheet at a boundary position between at least two battery cells. Therefore, the battery pack can prevent the attachment noise of the tag sheet.

Description

Battery pack

The present application claims the benefit of korean patent application No. 10-2019-0020486 filed in the korean intellectual property office on day 2 and 21 of 2019, the disclosure of which is incorporated herein by reference in its entirety.

Technical Field

One or more embodiments relate to a battery pack.

Background

In general, a secondary battery means a battery that can be charged and can be recharged unlike a primary battery that is not rechargeable. Secondary batteries are used as energy sources for devices such as mobile devices, electric vehicles, hybrid electric vehicles, electric bicycles, and uninterruptible power supplies. A single unit secondary battery or a plurality of unit secondary batteries (secondary battery packs) in which a plurality of battery cells are electrically connected are used according to the type of external device in which the secondary battery is used.

Unlike a small mobile device such as a cellular phone that can operate using a single battery for a certain period of time, a large mobile device such as a laptop computer that has a long operation time and requires high power driving or a high power consuming device such as an electric vehicle or a hybrid vehicle may need battery packs each including a plurality of batteries (battery cells) in consideration of problems related to power and capacity. The output voltage or output current of each battery pack may be increased by adjusting the number of batteries included in such battery pack.

Disclosure of Invention

One or more embodiments include a battery pack configured to prevent attachment noise of a tab.

Additional features will be set forth in part in the description which follows, and in part will be apparent from the description, or may be learned by practice of the disclosed presented embodiments.

According to one or more embodiments, a battery pack includes: at least two battery cells; a label sheet comprising an adhesive surface facing the at least two battery cells and an outer surface on a side facing away from the at least two battery cells, the label sheet extending across the at least two battery cells and bonding the at least two battery cells together; and a release paper block attached to the adhesive surface of the label sheet at a boundary position between the at least two battery cells.

For example, each of the at least two battery cells may include: a pair of main surfaces having a relatively large area and opposing each other; a pair of side surfaces having a relatively small area and facing each other; and an edge portion connecting the pair of main surfaces and the pair of side surfaces to each other.

For example, the adhesive surface of the label sheet may be attached to a plurality of main surfaces adjacent to each other among a plurality of pairs of main surfaces, and a release paper piece may be provided along an edge portion between the plurality of main surfaces to cover a portion of the adhesive surface of the label sheet.

For example, the release paper block may cover a concave space formed along an edge portion connecting the plurality of main surfaces and the plurality of pairs of side surfaces to each other.

For example, the release paper piece may extend over the edge portion to a flat portion of the plurality of main surfaces in the width direction of the release paper piece.

For example, the release paper block may include: the first and second release paper blocks are arranged in a row at positions spaced apart from each other along edge portions of the at least two battery cells.

For example, the first and second release paper blocks may have symmetrical shapes with respect to a release paper tangent line extending through a central position between the first and second release paper blocks.

For example, the first and second release paper blocks may be disposed at opposite positions spaced apart from a tangent to the release paper.

For example, the label sheet may include a first label portion and a second label portion that are distinguished from each other by a release paper tangent line that forms a boundary between the first label portion and the second label portion and that extends through a central location between the first release paper block and the second release paper block.

For example, the first label portion and the second label portion may correspond to different regions of the label sheet arranged along edge portions of the at least two battery cells.

For example, the first release paper piece may be biased to be close to a release paper tangent line formed on one of one side and the other side of the first label portion that are opposite to each other in the length direction of the first release paper piece, and the second release paper piece may be biased to be close to a release paper tangent line on one of one side and the other side of the second label portion that are opposite to each other in the length direction of the second release paper piece.

For example, the first and second release paper blocks may include at least two first and second release paper blocks spaced apart from each other in the arrangement direction of the at least two battery cells, respectively.

For example, the release paper block may be spaced apart from one side and the other side of the label sheet that are opposite to each other in the length direction of the release paper block.

For example, the release paper block may be provided in the form of islands that are isolated in the interior region of the label sheet.

For example, the release paper block may have a bar shape having rounded ends along one direction.

For example, the adhesive surface of the label sheet may be exposed by separating the release paper sheet from the label sheet, and when the release paper sheet is separated from the label sheet, the release paper block may be separated from the release paper sheet in a state in which the release paper block is attached to the adhesive surface of the label sheet.

For example, the release paper sheet may be separated from the label sheet while being divided into a first release paper sheet and a second release paper sheet along a release paper tangent line, the label sheet may include a first label portion and a second label portion that are distinguished from each other along the release paper tangent line, and the release paper block may include a first release paper block and a second release paper block that are attached to the first label portion and the second label portion, respectively.

Drawings

The above and other aspects, features and advantages of the particular embodiments disclosed will become more apparent from the following description when taken in conjunction with the accompanying drawings in which:

fig. 1 is an exploded perspective view illustrating a battery pack according to an embodiment;

FIG. 2 is a cross-sectional view taken along line II-II of FIG. 1;

fig. 3 is a view showing how a release paper sheet (release paper sheet) is separated from the label sheet shown in fig. 1;

FIG. 4 is a cross-sectional view taken along line IV-IV of FIG. 3 to illustrate how the release paper sheet separates from the label sheet shown in FIG. 1;

FIG. 5 is a plan view showing the tab sheet shown in FIG. 1; and

fig. 6 is a plan view of the label sheet as viewed in the VI direction of fig. 1.

Detailed Description

Reference will now be made in detail to the embodiments, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the like elements throughout. In this regard, the present embodiments may take various forms and should not be construed as limited to the descriptions set forth herein. Accordingly, the embodiments are described below only by referring to the drawings to explain aspects of the present description. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items. Throughout this disclosure, the expression "at least one (seed/person)" of a, b and c indicates all of a alone, b alone, c alone, both a and b, both a and c, both b and c, a, b and c, or variations thereof.

The battery pack will now be described according to an embodiment with reference to the accompanying drawings.

Fig. 1 is an exploded perspective view illustrating a battery pack according to an embodiment. Fig. 2 is a sectional view taken along line II-II of fig. 1. Fig. 3 is a view showing how a release paper sheet is separated from the label sheet shown in fig. 1. Fig. 4 is a cross-sectional view taken along line IV-IV of fig. 3 to illustrate how the release paper sheet is separated from the label sheet shown in fig. 1. Fig. 5 is a plan view illustrating the label sheet shown in fig. 1.

Referring to fig. 1, a battery pack according to an embodiment may include at least two battery cells 10, a label sheet 100 for covering the battery cells 10, and a release paper block 150 attached to the label sheet 100.

The battery pack may further include a frame 50 configured to support the battery cells 10. The frame 50 may include a cell accommodating part 51 accommodating the battery cell 10 and a circuit accommodating part 52 accommodating a circuit unit C electrically connected to the battery cell 10 for controlling a charging operation and a discharging operation of the battery cell 10. The label sheet 100 may be attached to the battery cell 10 at the opposite side from the frame 50.

Referring to fig. 1 and 2, each of the battery cells 10 may include a pair of main surfaces 10a opposite to each other and having a relatively large area, and a pair of side surfaces 10b opposite to each other and having a relatively small area. Further, each battery cell 10 may include: a first end portion 11 electrically connected to the circuit unit C while being in contact with both of the pair of main surfaces 10a and the pair of side surfaces 10 b; and a second end 12 opposite to the first end 11. The electrode tab 15 may be disposed on the first end 11 of the battery cell 10 for connection with the circuit unit C.

The edge portion 10ab may be formed between the main surface 10a and the side surface 10b of the battery cell 10 for connection between the main surface 10a and the side surface 10b. The edge portion 10ab may be rounded to smoothly connect the main surface 10a and the side surface 10b to each other. The side surfaces 10b of the battery cells 10 adjacent to each other may be adjacent to each other, and the concave spaces G may extend downward between the rounded edge portions 10ab of the battery cells 10. The concave space G may be formed along an edge portion 10ab extending downward from the main surface 10a of the battery cell 10 along the side surface 10b of the battery cell 10. In an embodiment, the edge portion 10ab connected between the main surface 10a and the side surface 10b of the battery cell 10 may correspond to a long edge portion or a short edge portion of the battery cell 10. In the embodiment shown in fig. 1, the edge portion 10ab connected between the main surface 10a and the side surface 10b of the battery cell 10 may correspond to a long edge portion of the battery cell 10.

The label sheet 100 may cover the battery cells 10 and may be attached to the battery cells 10 to bond the battery cells 10 together. The label sheet 100 may include an adhesive surface 100a facing the battery cell 10 and an outer surface 100b facing away from the battery cell 10. The adhesive surface 100a of the label sheet 100 may include an adhesive (not shown) for adhering to the battery cell 10, and the outer surface 100b of the label sheet 100 may form an exposed non-adhesive surface facing away from the battery cell 10. The adhesive surface 100a of the label sheet 100 may be attached to the main surfaces 10a of the battery cells 10 adjacent to each other to connect the main surfaces 10a of the battery cells 10 and firmly bond the battery cells 10 together.

In an embodiment, the main surface 10a of the battery cell 10 may be entirely or almost entirely covered with the label sheet 100 to enhance the coupling between the battery cells 10 adjacent to each other, to suppress the distortion of the battery cell 10, to prevent unstable adhesion of the label sheet 100 caused by the distortion of the battery cell 10, and to reduce the adhesion noise caused by the distortion of the battery cell 10.

Referring to fig. 1, the adhesive surface 100a of the label sheet 100 may be exposed by separating the release paper sheet 200 from the label sheet 100. As described later, when the release paper piece 200 is separated and removed from the label sheet 100, the release paper piece 200 may be divided into a first release paper piece 201 and a second release paper piece 202 along a release paper tangent line L. The release paper tangent line L serves to allow the release paper sheet 200 to be easily removed from the label sheet 100, and thus the release paper sheet 200 can be easily removed from the label sheet 100 while the first release paper sheet 201 and the second release paper sheet 202, which correspond substantially to half of the release paper sheet 200 along the release paper tangent line L, are separated in opposite directions with respect to the release paper tangent line L.

For reference, in the drawings attached to the present specification, for ease of understanding, a release paper tangent line L is drawn on the label sheet 100, but the release paper tangent line L is not actually formed on the label sheet 100. That is, a release paper tangent L is formed on the release paper sheet 200 attached to the label sheet 100 to promote separation of the release paper sheet 200 from the label sheet 100. In this sense, for ease of understanding, a release paper tangent line L that is actually formed on the release paper sheet 200 attached to or once attached to the label sheet 100 is also drawn on the label sheet 100. Further, the label sheet 100 may include a first label portion 101 and a second label portion 102 having a release paper tangent line L as a boundary. The first label portion 101 and the second label portion 102 are distinguished from each other along a release paper tangent L serving as a boundary between the first label portion 101 and the second label portion 102, and may be understood as different regions of the label sheet 100 as one continuous sheet, i.e., as different regions on both sides of the release paper tangent L. As described later, the release paper tangent L may be formed at a central position between the first release paper block 151 and the second release paper block 152, and thus after the release paper sheet 200 is removed from the label sheet 100, the release paper tangent L may correspond to a center line of the label sheet 100 passing through the central position between the first release paper block 151 and the second release paper block 152.

Referring to fig. 1 and 2, a release paper block 150 may be attached to a portion of the adhesive surface 100a of the label sheet 100 to cover a portion of the adhesive surface 100a of the label sheet 100. The release paper 150 may be placed between the adhesive surface 100a of the label sheet 100 and the battery cell 10 to prevent adhesion noise that may occur when the adhesive surface 100a of the label sheet 100 is repeatedly adhered to the battery cell 10 and separated from the battery cell 10. For example, when a bending force or a twisting force is applied to the battery cells 10 bonded together by the label sheet 100, the battery cells 10 may twist with respect to each other, and thus the bond between the label sheet 100 and the battery cells 10 may become unstable, thereby causing the label sheet 100 to be repeatedly separated from the battery cells 10 and attached to the battery cells 10 while generating attachment noise.

Thus, according to the embodiment, the release paper 150 is attached as a cover to the adhesive surface 100a of the label sheet 100 at a position corresponding to the boundary between the battery cells 10 where distortion may occur. Accordingly, the adhesive surface 100a is not adhered to the battery cell 10 at the boundary, and thus noise caused by unstable adhesion of the adhesive surface 100a can be prevented.

The release paper 150 may be attached to the adhesive surface 100a of the label sheet 100 along the edge portion 10ab of the battery cell 10. The adhesive surface 100a of the label sheet 100 may be attached to the main surfaces 10a of the battery cells 10 adjacent to each other, and the release paper 150 may be placed between the adhesive surface 100a of the label sheet 100 and the edge portion 10ab located between the main surfaces 10a of the battery cells 10 adjacent to each other to prevent the label sheet 100 from being adhered to the battery cells 10 at the edge portion 10ab.

The release paper 150 may cover the concave space G formed along the adjacent edge portions 10ab of the battery cell 10 (i.e., along the edge portions 10ab extending downward to connect the main surface 10a and the side surface 10b to each other), thereby reducing the adhesion noise that may occur when the adhesive surface 100a of the label sheet 100 is unstably repeatedly adhered to and separated from the edge portions 10ab, with the concave space being located between the edge portions 10ab. Specifically, when a bending load or a twisting load is applied to the battery cells 10 bonded together by the label sheet 100, twisting may occur at the edge portions 10ab between the battery cells 10, and thus the adhesive surface 100a of the label sheet 100 may repeatedly adhere to and separate from the edge portions 10ab, causing adhesion noise, with the concave space G between the edge portions 10ab. However, in the embodiment, the adhesive surface 100a of the label sheet 100 is covered to prevent the adhesive surface 100a from adhering to the edge portion 10ab, and thus the cause of the adhering noise can be removed.

Referring to fig. 1, the release paper block 150 may have a bar shape extending along the adjacent edge portions 10ab of the battery cells 10 and both ends of the release paper block 150 have a rounded shape, for example, the release paper block 150 may have a bar shape having both ends rounded in one direction. In order to be easily separated from the release paper sheet 200, the release paper block 150 has a rounded shape without any corner, so that when the release paper block 150 is separated from the release paper sheet 200, stress may not be concentrated at a specific position, thereby preventing the release paper block 150 from being torn or damaged.

The release paper block 150 may have a length extending along the adjacent edge portion 10ab of the battery cell 10 and a width (w) extending in a direction perpendicular to the length. As shown in fig. 2, the release paper 150 may extend to a portion of the main surface 10a connected to the adjacent edge portion 10ab of the battery cell 10, so that the release paper 150 may sufficiently cover the adjacent edge portion 10ab of the battery cell 10 in the width direction of the release paper 150. For example, the edge portion 10ab may have a rounded shape such that the main surface 10a and the side surface 10b forming different planes may be smoothly connected to each other by the edge portion 10ab, and the release paper piece 150 may extend to a flat portion of the main surface 10a over a boundary between the edge portion 10ab and the main surface 10 a. As described above, the release paper piece 150 extends widely to the portion of the main surface 10 a. Therefore, for example, a margin can be ensured according to the contact state between the battery cells 10, and unstable contact between the adhesive surface 100a of the label sheet 100 and the adjacent edge portion 10ab can be reliably prevented.

Referring to fig. 1 and 5, the release paper block 150 includes a first release paper block 151 and a second release paper block 152 attached to the adhesive surface 100a of the first label portion 101 and the adhesive surface 100a of the second label portion 102, respectively. That is, the first release paper 151 may be attached to the adhesive surface 100a of the first label portion 101 along the adjacent edge portion 10ab of the battery cell 10, and the second release paper 152 may be attached to the adhesive surface 100a of the second label portion 102 along the adjacent edge portion 10ab of the battery cell 10.

The first and second release paper blocks 151 and 152 may have an elongated shape extending in the length direction thereof in parallel with the adjacent edge portions 10ab of the battery cell 10. For example, the first and second release paper blocks 151 and 152 may be spaced apart from each other and arranged in a row along the adjacent edge portions 10ab of the battery cell 10. As described above, the first and second release paper blocks 151 and 152 may be disposed along the edge portion 10ab of the battery cell 10, and the first and second label portions 101 and 102, which are distinguished by the release paper tangent L extending between the first and second release paper blocks 151 and 152, may correspond to different regions of the label sheet 100 along the edge portion 10ab of the battery cell 10.

In an embodiment, the first and second release paper blocks 151 and 152 may be symmetrical in position and shape with respect to the release paper tangent line L. For example, the first and second release paper blocks 151 and 152 may be spaced apart from the release paper tangent line L by the same distance. In this case, the release paper tangent L may extend through a central position between the first release paper block 151 and the second release paper block 152. For example, the distance d1 between the release paper tangent L and the first release paper block 151 may be equal to the distance d2 between the release paper tangent L and the second release paper block 152.

The first and second release paper blocks 151 and 152 may be located at positions spaced apart from each other, with the release paper tangent L located between the first and second release paper blocks 151 and 152. That is, the distance d1 from the first release paper block 151 to the release paper tangent L and the distance d2 from the second release paper block 152 to the release paper tangent L may be set to be greater than zero, and in this case, the release paper sheet 200 may be easily separated from the label sheet 100 because the first release paper block 151 and the second release paper block 152 are spaced apart from the release paper tangent L.

For example, the first and second release paper pieces 151 and 152 may be provided in the form of islands that are isolated in the inner areas of the first and second label portions 101 and 102 and that are separated from one side of the first and second label portions 101 and 102 (the side corresponding to the release paper tangent line L, hereinafter the same) and the other sides S1 and S2 of the first and second label portions 101 and 102, such that the first and second release paper pieces 151 and 152 may not intersect with the one side (the side corresponding to the release paper tangent line L) and the other sides S1 and S2 facing each other in the length direction of the first and second release paper pieces 151 and 152. For reference, one side (one side corresponding to the release paper tangent line L) and the other sides S1 and S2 in the length direction of the first and second release paper blocks 151 and 152 may represent one side (one side corresponding to the release paper tangent line L) and the other sides S1 and S2 of the first and second tag portions 101 and 102, and may also represent one side (one side corresponding to the release paper tangent line L) and the other sides S1 and S2 of the first and second release paper sheets 201 and 202 (refer to fig. 3).

The expression of "the first and second release paper blocks 151 and 152 are provided in the form of islands isolated in the inner areas of the first and second label portions 101 and 102" may mean that the first and second release paper blocks 151 and 152 are provided in the form of islands isolated in the inner areas of the first and second release paper sheets 201 and 202 (refer to fig. 3). That is, the first and second release paper pieces 151 and 152 may be disposed in an inner region of the first and second release paper pieces 201 and 202 (refer to fig. 3) that is separated from one side (a side corresponding to the release paper tangent line L) and the other sides S1 and S2 of the first and second release paper pieces 201 and 202 (refer to fig. 3) in the length direction of the first and second release paper pieces 151 and 152.

Referring to fig. 3 and 4, when separating the release paper sheet 200 from the label sheet 100, a separation tension may be applied in a direction along one side of the first release paper sheet 201 (the side corresponding to the release paper tangent line L) or the other side S1 of the first release paper sheet 201 from the corner of the first release paper sheet 201. In this case, since the first release paper piece 151 is disposed in the inner region of the first release paper piece 201 separated from the one side (the side corresponding to the release paper tangent line L) and the other side S1, the first release paper piece 151 does not hinder the separation of the first release paper piece 201 from the label sheet 100, and can be smoothly separated from the first release paper piece 201 after the first release paper piece 201 is slightly separated from the label sheet 100.

For example, when separating the release paper sheet 200 from the label sheet 100, the first release paper sheet 201 may be separated from the label sheet 100 while applying a separation tension to the first release paper sheet 201 from the corner of the first release paper sheet 201 in a direction along one side (release paper tangent line L or the other side S1, hereinafter the same) of the first release paper sheet 201. In this case, in order for the first release paper piece 201 to smoothly separate from the separation start point P11 to the separation end point P2 along one side of the first release paper piece 201 (release paper tangent line L), a uniform separation resistance along one side of the first release paper piece 201 (release paper tangent line L) may be required.

If the first release paper piece 151 is in contact with one side (release paper tangent L) of the first release paper piece 201, the separation process may face different resistance or relatively high resistance due to the separation of the first release paper piece 151 from the first release paper piece 201 at the position P5 corresponding to the first release paper piece 151, and in the separation process, a uniform separation tension is applied to the first release paper piece 201 along one side (release paper tangent L) of the first release paper piece 201 from the separation start point P11 to the separation end point P2 against the separation resistance caused by the adhesive force of the label sheet 100. Therefore, the first release paper piece 201 is not smoothly separated from the label sheet 100, and the separation of the first release paper piece 201 may be stopped at the position P5 corresponding to the first release paper piece 151 due to the physical interference between the first release paper piece 151 and the first release paper piece 201. Due to such separation errors, the separation process may have to be performed again. That is, the separation resistance occurring when the first release paper piece 151 is separated from the first release paper piece 201 may be a discontinuous resistance different from the separation resistance caused by the adhesive force of the label sheet 100, and may be greater than the separation resistance caused by the adhesive force of the label sheet 100. Accordingly, while applying uniform tension to perform the separation process, the worker may adjust the tension at the position P5 corresponding to the first release paper piece 151, and may need to perform the separation process again due to poor or improper separation of the first release paper piece 151 from the first release paper piece 201. In the embodiment, the first release paper piece 151 is disposed in an inner region of the first release paper piece 201 that is separated from the one side (release paper tangent line L), and thus, after the first release paper piece 201 is slightly separated from the label sheet 100 in one direction from the one side (release paper tangent line L), the first release paper piece 151 can be smoothly separated from the first release paper piece 201.

Referring to fig. 5, the first release paper piece 151 may be disposed at a position distant from one side (release paper tangent L) and the other side S1 of the first label portion 101, in which case one of the one side (release paper tangent L) and the other side S1 of the first label portion 101 may be closer to the first release paper piece 151 than the other. In an embodiment, the first release paper block 151 may be disposed at a position relatively close to the release paper tangent line L formed on one side of the first label portion 101, that is, at a position offset toward the release paper tangent line L in the length direction of the first release paper block 151. For example, the first release paper piece 151 may be spaced apart from the release paper tangent 201, wherein a distance d1 between the first release paper piece 151 and the release paper tangent 201 is greater than about 0mm. For example, the spacing d1 may be about 2.5mm.

Since the first release paper piece 151 is biased toward the release paper tangent L formed at the center position of the battery cell 10, it is possible to effectively reduce the adhesion noise that may occur strongly at the center position of the battery cell 10. For example, when the attachment of the label sheet 100 to the battery cell 10 is unstable due to the twisting of the battery cells 10 bonded together by the label sheet 100, the attachment noise may be caused, and since the battery cell 10 is twisted in such a manner that reverse twisting occurs repeatedly along the central axis, the attachment noise may be strongly generated at the central position of the battery cell 10.

At the center position of the battery cell 10, the first and second release paper blocks 151 and 152 may be arranged with a small distance d12 therebetween such that the first and second release paper blocks 151 and 152 may be adjacent to each other, and the distance d12 between the first and second release paper blocks 151 and 152 may be smaller than the distance h1 between the first release paper block 151 and the other side S1 of the first label portion 101 or the distance h2 between the second release paper block 152 and the other side S2 of the second label portion 102. In other words, the distance d1 between the first release paper piece 151 and the release paper tangent L corresponding to approximately half of the distance d12 between the first release paper piece 151 and the second release paper piece 152 may be smaller than the distance h1 between the first release paper piece 151 and the other side S1 of the first label portion 101. That is, the first release paper block 151 may be located at a position biased toward the release paper tangent L.

The distance d12 between the first and second release paper blocks 151 and 152 corresponds to the sum of the distance d1 between the first and second release paper blocks 151 and the release paper tangent L and the distance d2 between the second release paper block 152 and the release paper tangent L, and when the distance d1 between the first and second release paper blocks 151 and 152 is equal to the distance d2 between the second release paper block 152 and the release paper tangent L, the distance d12 between the first and second release paper blocks 151 and 152 may be twice the distance d1 between the first and second release paper blocks 151 and L, or the distance d1 between the first and second release paper blocks 151 and 152 may be half the distance d12 between the first and second release paper blocks 151 and 152.

Similar to the first release paper block 151, the second release paper block 152 may be provided in the form of islands that are isolated in the inner region of the second label portion 102 and separated from one side (corresponding to the release paper tangent L, hereinafter the same) and the other side S2 of the second label portion 102, such that the second release paper block 152 may not intersect the one side (corresponding to the release paper tangent L) and the other side S2 facing each other in the length direction of the second release paper block 152. The expression "the second release paper 152 is provided in the form of islands isolated in the interior region of the second label portion 102" may mean that the second release paper 152 is provided in the form of islands isolated in the interior region of the second release paper sheet 202 (refer to fig. 3). That is, the second release paper piece 152 may be provided in an inner region of the second release paper piece 202 (refer to fig. 3) that is separated from one side (release paper tangent line L) and the other side S2 of the second release paper piece 202 (refer to fig. 3) in the length direction of the second release paper piece 152.

Referring to fig. 3 and 4, when the second release paper sheet 202 is separated from the label sheet 100, a separation tension may be applied in a direction along one side of the second release paper sheet 202 (release paper tangent line L) or the other side S2 of the second release paper sheet 202 from the corner of the second release paper sheet 202. In this case, since the second release paper piece 152 is disposed in an inner region of the second release paper piece 202 that is separated from the one side (release paper tangent line L) and the other side S2, the second release paper piece 202 may be smoothly separated from the second release paper piece 202, for example, along the one side (release paper tangent line L) of the second release paper piece 202 from the separation start point P21 to the separation end point P2, and after the second release paper piece 202 is slightly separated from the label sheet 100 in one direction from the one side (release paper tangent line L), the second release paper piece 152 may be smoothly separated from the second release paper piece 202 at the position P5 corresponding to the second release paper piece 152.

Referring to fig. 5, the second release paper piece 152 may be disposed at a position distant from one side (release paper tangent L) and the other side S2 of the second label portion 102, and in this case, one of the one side (release paper tangent L) and the other side S2 of the second label portion 102 may be closer to the second release paper piece 152 than the other. In an embodiment, the second release paper piece 152 may be relatively close to the release paper tangent L formed on one side of the second label portion 102, and the distance d2 between the second release paper piece 152 and the release paper tangent L may be greater than about 0mm, such that the second release paper piece 152 may be spaced apart from the release paper tangent L. For example, the distance d2 between the second release paper block 152 and the release paper tangent L may be about 2.5mm.

Fig. 6 is a plan view of the label sheet 100 viewed in the VI direction of fig. 1.

Referring to fig. 1 and 6, the label sheet 100 may include a folded portion (f) folded along an edge of the frame 50 to surround the frame 50 in which the battery cells 10 are received. The center position at which the release paper tangent line L is formed may be closer to the release paper block 150 than the edge along which the folded portion (f) is formed in the length direction of the release paper block 150. For example, the distance d12 between the first release paper block 151 and the second release paper block 152 may be smaller than the distance r1 between the first release paper block 151 and the folded portion (f) or the distance r2 between the second release paper block 152 and the folded portion (f). For example, the distance d12 between the first release paper piece 151 and the second release paper piece 152 may be smaller than the distance r1 between the first release paper piece 151 and the folded portion (f). However, the distance d12 between the first release paper block 151 and the second release paper block 152 may be equal to the distance r2 between the second release paper block 152 and the folded portion (f). Since the second end 12 of the battery cell 10 is more susceptible to bending or twisting that causes the attachment noise than the first end 11 of the battery cell 10 coupled to the circuit unit C, this is to effectively reduce the attachment noise by placing the release paper 150 at a position closer to the second end 12 of the battery cell 10 than the first end 11 of the battery cell 10.

Referring to fig. 3 and 4, a perforated or thin portion having a relatively small thickness may be formed in the release paper sheet 200 along the contour T of the first and second release paper blocks 151 and 152 to facilitate separation of the first and second release paper blocks 151 and 152 from the release paper sheet 200. When the first and second release paper pieces 201 and 202 are separated from the label sheet 100, the first and second release paper pieces 151 and 152 may be separated from the first and second release paper pieces 201 and 202. For example, when the first release paper piece 201 is separated from the label sheet 100, the first release paper piece 151 attached to the label sheet 100 may remain on the label sheet 100 and may thus be separated from the first release paper piece 201. Similarly, when the second release paper sheet 202 is separated from the label sheet 100, the second release paper piece 152 attached to the label sheet 100 may remain on the label sheet 100 and may thus be separated from the second release paper sheet 202.

Referring to fig. 1, the number of battery cells 10 may be at least two, and in an embodiment, the number of battery cells 10 may be three. In this case, the label sheet 100 may extend over three battery cells 10 and may be attached to the three battery cells 10, and two release paper blocks 150 may be provided on the label sheet 100 in such a manner that the two release paper blocks 150 are spaced apart from each other in the arrangement direction of the three battery cells 10.

For example, the first release paper 151 may include two first release paper 151 spaced apart from each other in the arrangement direction of the battery cells 10, and similarly, the second release paper 152 may include two second release paper 152 spaced apart from each other in the arrangement direction of the battery cells 10. In the present disclosure, the number of battery cells 10 is not limited, and the release paper block 150 may be provided at each edge portion 10ab corresponding to a boundary between battery cells 10 adjacent to each other along the arrangement direction of the battery cells 10.

As described above, according to one or more of the above embodiments, the release paper block is disposed at a predetermined position of the adhesive surface of the tab sheet attached to the adjacent battery cell, thereby preventing unstable attachment of the tab sheet at the boundary of the adjacent battery cell and attachment noise that may occur when the tab sheet is repeatedly adhered to and separated from the battery cell at the boundary.

It should be understood that the embodiments described herein should be considered in descriptive sense only and not for purposes of limitation. The description of features or aspects within each embodiment should generally be considered to be applicable to other similar features or aspects in other embodiments. Although one or more embodiments have been described with reference to the figures, persons of ordinary skill in the art will understand that various changes in form and details may be made therein without departing from the spirit and scope as defined by the claims.

Claims

1. A battery pack, the battery pack comprising:

at least two battery cells;

a label sheet comprising an adhesive surface facing the at least two battery cells and an outer surface on a side facing away from the at least two battery cells, the label sheet extending across the at least two battery cells and bonding the at least two battery cells together; and

a release paper block attached to an adhesive surface of the label sheet at a boundary position between the at least two battery cells,

wherein each of the at least two battery cells includes:

a pair of main surfaces having a relatively large area and opposing each other;

a pair of side surfaces having a relatively small area and opposing each other; and

an edge portion connecting the pair of main surfaces and the pair of side surfaces to each other, an

Wherein the release paper block is placed at least between the adhesive surface of the label sheet and the edge portion between the main surfaces of the battery cells adjacent to each other.

2. The battery pack according to claim 1, wherein the adhesive surface of the label sheet is attached to a plurality of main surfaces adjacent to each other among the plurality of pairs of main surfaces, and

a release paper block is disposed along an edge portion between the plurality of main surfaces to cover a portion of the adhesive surface of the label sheet.

3. The battery pack according to claim 2, wherein the release paper block covers a concave space formed along edge portions connecting the plurality of main surfaces and the plurality of pairs of side surfaces to each other.

4. The battery pack according to claim 2, wherein the release paper piece extends over the edge portion to the flat portions of the plurality of main surfaces in the width direction of the release paper piece.

5. The battery pack of claim 2, wherein the release paper block comprises: the first and second release paper blocks are arranged in a row at positions spaced apart from each other along edge portions of the at least two battery cells.

6. The battery pack of claim 5, wherein the first and second release paper blocks have a symmetrical shape with respect to a release paper tangent extending through a central location between the first and second release paper blocks.

7. The battery pack of claim 6, wherein the first and second release paper blocks are disposed at opposite positions spaced apart from a tangent to the release paper.

8. The battery pack of claim 5, wherein the tab sheet includes a first tab portion and a second tab portion that are distinguished from each other by a release paper tangent line that forms a boundary between the first tab portion and the second tab portion and extends through a central location between the first release paper block and the second release paper block.

9. The battery pack of claim 8, wherein the first and second tab portions correspond to different regions of the tab sheet disposed along edge portions of the at least two battery cells.

10. The battery pack according to claim 8, wherein the first release paper piece is biased to be close to a release paper tangent formed on one of one side and the other side of the first label portion opposite to each other in the length direction of the first release paper piece, and

the second release paper piece is biased to be close to a release paper tangent line formed on one of one side and the other side of the second label portion that are opposite to each other in the length direction of the second release paper piece.

11. The battery pack according to claim 5, wherein the first and second release paper blocks respectively include at least two first and second release paper blocks spaced apart from each other in an arrangement direction of the at least two battery cells.

12. The battery pack according to claim 1, wherein the release paper block is spaced apart from one side and the other side of the label sheet opposite to each other in a length direction of the release paper block.

13. The battery pack of claim 12, wherein the release paper block is provided in the form of islands isolated in an interior region of the tab sheet.

14. The battery pack according to claim 1, wherein the release paper block has a bar shape having rounded both ends in one direction.

15. The battery pack according to claim 1, wherein the adhesive surface of the label sheet is exposed by separating the release paper sheet from the label sheet, and

when the release paper piece is separated from the label sheet, the release paper piece is separated from the release paper piece in a state in which the release paper piece is attached to the adhesive surface of the label sheet.

16. The battery pack according to claim 15, wherein the release paper sheet is separated from the label sheet while being divided into a first release paper sheet and a second release paper sheet along a release paper tangent line,

the label sheet includes a first label portion and a second label portion which are distinguished from each other along a cut line of the release paper, and

the release paper block includes a first release paper block and a second release paper block attached to the first label portion and the second label portion, respectively.