CN111600082B - Battery pack - Google Patents

Abstract

A battery pack is provided. The battery pack comprises: 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 spanning the at least two battery cells extending and bonding the at least two battery cells together; and a piece of release paper attached to the adhesive surface of the label sheet at a boundary position between the at least two battery cells. Therefore, the battery pack can prevent the attachment noise of the label sheet.

Description

Battery

This application claims the benefit of Korean Patent Application No. 10-2019-0020486 filed with the Korean Intellectual Property Office on February 21, 2019, the disclosure of which is hereby incorporated by reference in its entirety.

technical field

One or more embodiments relate to a battery pack.

Background technique

In general, a secondary battery means a chargeable and rechargeable battery different from a non-rechargeable primary battery. Secondary batteries are used as energy sources for devices such as mobile devices, electric vehicles, hybrid electric vehicles, electric bicycles, and uninterruptible power supplies. Depending on the type of external device using the secondary battery, a single unit secondary battery or a plurality of unit secondary batteries (secondary battery pack) in which a plurality of battery cells are electrically connected is used.

Unlike a small mobile device such as a cellular phone that can be operated for a certain period of time using a single battery, a large mobile device such as a laptop computer that has a long operating time and requires high-power drive or such as a High power consumers of electric vehicles or hybrid vehicles may require battery packs each including a plurality of batteries (battery cells). The output voltage or output current of such a battery pack can be increased by adjusting the number of batteries included in each battery pack.

Contents of the invention

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

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

According to one or more embodiments, a battery pack includes: at least two battery cells; a label sheet including an adhesive surface facing the at least two battery cells and a label sheet located opposite to the at least two battery cells. an outer surface on one side of the cell, the label sheet extending across the at least two battery cells and bonding the at least two battery cells together; and a release paper piece on the at least two battery cells The border between monomers is attached to the adhesive surface of the label sheet.

For example, each of the at least two battery cells may include: a pair of main surfaces having a relatively large area and facing each other; a pair of side surfaces having a relatively small area and facing each other; and edge portions, The pair of main surfaces and the pair of side surfaces are connected to each other.

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

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

For example, the release paper pieces may include first and second release paper pieces 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 release paper piece and the second release paper piece may have symmetrical shapes with respect to a liner tangent extending through a central location between the first release paper piece and the second release paper piece.

For example, the first release paper block and the second release paper block may be arranged at opposite positions spaced apart from the tangent line of the release paper.

For example, the label sheet may include a first label portion and a second label portion that are separated from each other by a liner cut that forms a boundary between the first label portion and the second label portion and extends through the first release liner. The center position between the 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 block may be biased close to the release paper formed on one of the side and the other side of the first label portion opposite to each other in the length direction of the first release paper block tangent line, and the second release paper piece can be biased to be close to the release paper tangent line on one of the side and the other side of the second release paper piece opposite to each other in the length direction of the second label portion .

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

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

For example, the release liner blocks may be provided in the form of isolated islands in the inner region of the label sheet.

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

For example, the adhesive surface of the label sheet can be exposed by separating the release liner from the label sheet, and when the release liner is separated from the label sheet, the release liner can be removed from the adhesive where the release liner is attached to the label sheet. It is separated from the release paper in the state of the surface.

For example, the release paper sheet can be separated from the label sheet while being divided into a first release paper sheet and a second release paper sheet along the tangent line of the release paper, and the label sheet can include a The first label portion and the second label portion, and the release liner segment may include a first release liner segment and a second release liner segment attached to the first label portion and the second label portion, respectively.

Description of drawings

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

FIG. 1 is an exploded perspective view showing 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 sectional view taken along line IV-IV of Fig. 3 to show how the release paper sheet is separated from the label sheet shown in Fig. 1;

Fig. 5 is a plan view showing the label sheet shown in Fig. 1; and

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

Detailed ways

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 like elements throughout. In this regard, the present embodiments may have different forms and should not be construed as being limited to the descriptions set forth herein. Accordingly, the embodiments are merely described below, by referring to the figures, 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 the disclosure, the expression "at least one of a, b, and c" indicates only a, only b, only c, both a and b, both a and c, both b and c , all of a, b and c or their variants.

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

FIG. 1 is an exploded perspective view showing 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 is separated from the label sheet shown in FIG. 1 . FIG. 4 is a sectional view taken along line IV-IV of FIG. 3 to show how the release paper sheet is separated from the label sheet shown in FIG. 1 . Fig. 5 is a plan view showing 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 piece 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 portion 51 accommodating the battery cell 10 and a circuit accommodating portion 52 accommodating a circuit unit C electrically connected to the battery cell 10 for controlling charging operation and discharging operation of the battery cell 10 . The label sheet 100 may be attached to the battery cell 10 at a side opposite to the frame 50 .

Referring to FIGS. 1 and 2 , each battery cell 10 may include a pair of main surfaces 10 a facing each other and having a relatively large area and a pair of side surfaces 10 b facing each other and having a relatively small area. Furthermore, each battery cell 10 may include: a first end portion 11 electrically connected to the circuit unit C while in contact with both the pair of main surfaces 10a and the pair of side surfaces 10b; and a second end portion 12 connected to the second end portion 10a. One end 11 is opposite to each other. An electrode tab 15 may be disposed on the first end portion 11 of the battery cell 10 for connection with the circuit unit C. As shown in FIG.

An 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 so that the main surface 10a and the side surface 10b are smoothly connected to each other. The side surfaces 10 b of the battery cells 10 adjacent to each other may be adjacent to each other, and the concave space G may extend downward between the rounded edge portions 10 ab of the battery cells 10 . The concave space G may be formed along the 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 , an edge portion 10ab connected between a main surface 10a and a 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 100 a facing the battery cell 10 and an outer surface 100 b 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. surface. 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 completely or almost completely covered by the label sheet 100, so as to enhance the bonding between the battery cells 10 adjacent to each other, suppress the distortion of the battery cell 10, and prevent the Unstable attachment of the label sheet 100 caused by the twist of the battery cell 10 is reduced, and adhesion noise caused by the twist of the battery cell 10 is reduced.

Referring to FIG. 1 , the adhesive surface 100 a of the label sheet 100 may be exposed by separating the release paper sheet 200 from the label sheet 100 . As described later, when separating from the label sheet 100 and removing the release paper sheet 200, the release paper sheet 200 can be divided into a first release paper sheet 201 and a second release paper sheet 200 along the release paper tangent line L. Sheet 202. The release paper tangent line L is used to allow the release paper sheet 200 to be easily removed from the label sheet 100, so the release paper sheet 200 can be easily removed from the label sheet 100, and the release paper sheet 200 can be easily removed along the release paper tangent line L and the release paper sheet. Half of 200 roughly correspond to the first release paper sheet 201 and the second release paper sheet 202 separated in opposite directions with respect to the tangent line L of the release paper.

For reference, in the drawings attached to this specification, the liner cut line L is drawn on the label sheet 100 for easy understanding, but the liner line L is not actually formed on the label sheet 100 . That is, the release paper tangent line L is formed on the release paper sheet 200 attached to the label sheet 100 to facilitate separation of the release paper sheet 200 from the label sheet 100 . In this sense, the liner tangent line L actually formed on the release paper sheet 200 attached or once attached to the label sheet 100 is also drawn on the label sheet 100 for easy understanding. In addition, the label sheet 100 may include a first label part 101 and a second label part 102 having a liner cut line L as a boundary. The first label part 101 and the second label part 102 are distinguished from each other along the liner tangent line L serving as the boundary between the first label part 101 and the second label part 102, and can be understood as one continuous piece. Different regions of the label sheet 100, ie, are understood to be different regions on both sides of the tangent line L of the release paper. As described later, the liner tangent line L may be formed at the center position between the first release paper piece 151 and the second release paper piece 152 , so after removing the release paper sheet 200 from the label sheet 100 The tangent line L of the release paper may correspond to the center line of the label sheet 100 passing through the center between the first release paper block 151 and the second release paper block 152 .

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

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

The release paper piece 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 piece 150 may be placed between the adhesive surface 100a of the label sheet 100 and the battery cells 10 located adjacent to each other. Between the edge portions 10ab between the main surfaces 10a to prevent the label sheet 100 from adhering to the battery cell 10 at the edge portions 10ab.

The release paper 150 may cover the concave space G formed along the adjacent edge portion 10ab of the battery cell 10 (ie, along the edge portion 10ab extending downward to connect the main surface 10a and the side surface 10b to each other), Thereby reducing adhesion noise that may occur when the adhesive surface 100a of the label sheet 100 is unstable and repeatedly adhered to and separated from the edge portions 10ab between which the concave spaces are located. 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 portion 10ab between the battery cells 10, so that the adhesive surface 100a of the label sheet 100 There may be repeated adhesion to and separation from the edge portions 10ab, in which the concave space G is located between the edge portions 10ab, causing adhesion noise. However, in the embodiment, the adhesive surface 100a of the label sheet 100 is covered to prevent the adhesive surface 100a from sticking to the edge portion 10ab, and thus the cause of sticking noise can be removed.

Referring to FIG. 1 , the release paper block 150 may have a strip shape extending along adjacent edge portions 10ab of the battery cell 10 and both ends of the release paper block 150 have a rounded shape, for example, a release paper block 150 may have a bar shape with rounded ends along 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 angular corners, so when the release paper block 150 is separated from the release paper sheet 200, the stress can not be concentrated on the 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 block 150 may extend to the portion of the main surface 10a connected to the adjacent edge portion 10ab of the battery cell 10, so that the release paper block 150 may be in the width direction of the release paper block 150. Adjacent edge portions 10ab of the battery cells 10 are sufficiently covered. For example, the edge portion 10ab may have a rounded shape, so 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 be formed between the edge portion 10ab and the main surface. The boundary between 10a extends above the flat portion of the main surface 10a. As described above, the release liner block 150 extends broadly over a portion of the major surface 10a. 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.

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

The first release paper piece 151 and the second release paper piece 152 may have an elongated shape extending in a length direction thereof parallel to the adjacent edge portion 10ab of the battery cell 10 . For example, the first release paper pieces 151 and the second release paper pieces 152 may be spaced apart from each other and arranged in a row along adjacent edge portions 10ab of the battery cells 10 . As described above, the first release paper block 151 and the second release paper block 152 can be arranged along the edge portion 10ab of the battery cell 10, and through the first release paper block 151 and the second release paper The first label portion 101 and the second label portion 102 separated by the liner cut line L extending between the blocks 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 release paper block 151 and the second release paper block 152 may be symmetrical in position and shape with respect to the tangent line L of the release paper. For example, the first release paper block 151 and the second release paper block 152 may be spaced apart from the tangent line L of the release paper by the same distance. In this case, the tangent line L of the release paper may extend through the center between the first release paper block 151 and the second release paper block 152 . For example, the distance d1 between the tangent line L of the release paper and the first release paper block 151 may be equal to the distance d2 between the tangent line L of the release paper and the second release paper block 152 .

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

For example, the first release paper block 151 and the second release paper block 152 can be provided in the form of an island, which is isolated in the inner area of the first label part 101 and the second label part 102 and separated from the first label One side of the part 101 and the second label part 102 (the side corresponding to the tangent line L of the release paper, the same below) and the other sides S1 and S2 of the first label part 101 and the second label part 102 are separated, so that the first The release paper block 151 and the second release paper block 152 can be on the lengthwise direction of the first release paper block 151 and the second release paper block 152. side) and said other sides S1 and S2 facing each other intersect. For reference, one side (the side corresponding to the tangent line L of the release paper) and the other side S1 and S2 in the length direction of the first release paper block 151 and the second release paper block 152 may represent the first One side of the label part 101 and the second label part 102 (the side corresponding to the tangent line L of the release paper) and the other sides S1 and S2, and can also represent the first release paper sheet 201 and the second release paper sheet 202 (refer to FIG. 3 ) on one side (the side corresponding to the tangent line L of the release paper) and the other sides S1 and S2.

The expression "the first release paper block 151 and the second release paper block 152 are arranged in the form of an island isolated in the inner area of the first label part 101 and the second label part 102" may mean that the first release paper The block 151 and the second release paper block 152 are provided in the form of islands isolated in inner regions of the first release paper sheet 201 and the second release paper sheet 202 (refer to FIG. 3 ). That is to say, the first release paper piece 151 and the second release paper piece 152 can be arranged in the inner area of the first release paper piece 201 and the second release paper piece 202 (refer to FIG. 3 ), the inner area On the length direction of the first release paper block 151 and the second release paper block 152, one side of the first release paper sheet 201 and the second release paper sheet 202 (refer to FIG. 3 ) (tangent to the release paper) L corresponds to one side) and the other side S1 and S2 are separated.

Referring to Fig. 3 and Fig. 4, when the release paper sheet 200 is separated from the label sheet 100, it can be from the corner of the first release paper sheet 201 along one side of the first release paper sheet 201 (with the release paper The side corresponding to the tangent line L) or the direction of the other side S1 of the first release paper sheet 201 is applied with separation tension. In this case, because the first release paper block 151 is arranged on the side of the first release paper sheet 201 that is separated from the one side (the side corresponding to the tangent line L of the release paper) and the other side S1 In the inner area, the first release paper block 151 will not hinder the separation of the first release paper sheet 201 from the label sheet 100, and can be separated from the first release paper sheet 201 after the first release paper sheet 201 is slightly separated from the label sheet 100. The stencil sheet 201 is separated smoothly.

For example, when the release paper sheet 200 is separated from the label sheet 100, it may be along one side of the first release paper sheet 201 from the corner of the first release paper sheet 201 (the release paper tangent line L or the other side) S1, hereinafter the same) applies separation tension to the first release paper sheet 201 while separating the first release paper sheet 201 from the label sheet 100 . In this case, for the first release paper sheet 201 to be smoothly separated from the separation start point P11 to the separation end point P2 along one side (release paper tangent line L) of the first release paper sheet 201, it may be necessary to Uniform separation resistance on one side of the first release paper sheet 201 (release paper tangent line L).

If the first release paper block 151 is in contact with one side of the first release paper sheet 201 (the release paper tangent line L), the separation process may be due to the first release paper block 151 corresponding to the first release paper block 151 The position P5 is separated from the first release paper sheet 201 and faces different resistance or relatively high resistance. In the separation process, it resists the separation resistance caused by the adhesive force of the label sheet 100 from the separation starting point P11 to the separation The end point P2 applies a uniform separation tension to the first release paper 201 along one side of the first release paper 201 (the tangent line L of the release paper). Therefore, the first release paper piece 201 will not be separated from the label sheet 100 smoothly, and the separation of the first release paper piece 201 will be caused by the physical force between the first release paper piece 151 and the first release paper piece 201. interference and stop at the position P5 corresponding to the first release paper block 151 . Due to such separation errors, it may be necessary to perform the separation process again. That is, the separation resistance that occurs when the first release paper piece 151 is separated from the first release paper sheet 201 may be a discontinuous resistance different from the separation resistance caused by the adhesive force of the label sheet 100, and may be It is larger than the separation resistance caused by the adhesive force of the label sheet 100 . Therefore, while applying uniform tension to perform the separation process, the worker can adjust the tension at the position P5 corresponding to the first release paper piece 151 , and since the first release paper piece 151 and the first release paper piece 201 Poor separation or inappropriate separation may require the separation process to be performed again. In the embodiment, the first release paper piece 151 is arranged in the inner area of the first release paper sheet 201 separated from the side (release paper tangent line L), therefore, in the first release paper sheet 201 After being slightly separated from the label sheet 100 along one direction from the side (the release paper tangent line L), the first release paper piece 151 can be smoothly separated from the first release paper sheet 201 .

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

Since the first release paper block 151 is biased toward the release paper tangent line L formed at the center position of the battery cell 10 , adhesion noise that may strongly occur at the center position of the battery cell 10 may be effectively reduced. For example, when the attachment of the label sheet 100 to the battery cell 10 is unstable due to twisting of the battery cell 10 bonded together by the label sheet 100, attachment noise may be caused, and because the battery cell 10 moves along the central axis Formal twisting of reverse twisting repeatedly occurs, so adhesion noise may be strongly generated at the central position of the battery cell 10 .

At the central position of the battery cell 10, the first release paper block 151 and the second release paper block 152 can be arranged with a small distance d12 therebetween, so that the first release paper block 151 and the second release paper block 152 can be adjacent to each other, and the distance d12 between the first release paper block 151 and the second release paper block 152 can be greater than that between the first release paper block 151 and the other side S1 of the first label part 101. The distance h1 or the distance h2 between the second release paper block 152 and the other side S2 of the second label part 102 is small. In other words, the distance d1 between the first release paper block 151 and the tangent line L of the release paper corresponding to approximately half of the distance d12 between the first release paper block 151 and the second release paper block 152 can be compared to The distance h1 between the first release paper block 151 and the other side S1 of the first label part 101 is small. That is to say, the first release paper block 151 may be located at a position offset toward the tangent line L of the release paper.

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

Similar to the first release paper block 151, the second release paper block 152 can be provided in the form of an island that is isolated in the inner area of the second label part 102 and is separated from one side of the second label part 102 (with the The release paper tangent line L corresponds, the same below) and the other side S2 are separated, so that the second release paper block 152 can not be on the second release paper block 152 in the length direction of the side facing each other (corresponding On one side of the tangent line L of the release paper) intersects the other side S2. The expression "the second release paper piece 152 is arranged in the form of an isolated island in the inner area of the second label part 102" may mean that the second release paper piece 152 is arranged on the second release paper sheet 202 (refer to Figure 3) in the form of isolated islands in the inner region. That is to say, the second release paper piece 152 can be arranged in the inner area of the second release paper piece 202 (refer to FIG. 3 ), which is separated from the second release paper piece 152 in the length direction. One side (the liner tangent line L) of the liner sheet 202 (see FIG. 3 ) is separated from the other side S2.

Referring to Fig. 3 and Fig. 4, when the second release paper sheet 202 is separated from the label sheet 100, it can be from the corner of the second release paper sheet 202 along one side of the second release paper sheet 202 (release paper Separation tension is applied in the direction of the tangent line L) or the other side S2 of the second release paper sheet 202 . In this case, since the second release paper piece 152 is provided in the inner region of the second release paper sheet 202 separated from the one side (release paper tangent line L) and the other side S2, The second release paper sheet 202 can, for example, be smoothly separated from the separation starting point P21 to the separation end point P2 along one side of the second release paper sheet 202 (release paper tangent line L), and After the one side (cutting line L of the release paper) is slightly separated from the label sheet 100 in one direction, the second release paper block 152 can be aligned with the second release paper at a position P5 corresponding to the second release paper block 152. The pieces 202 are separated smoothly.

Referring to Fig. 5, the second release paper block 152 can be arranged on one side (release paper tangent line L) and the other side S2 away from the second label part 102, and in this case, the second label part One of one side of 102 (the liner tangent line L) and the other side S2 may be closer to the second liner block 152 than the other. In an embodiment, the second release paper block 152 may be relatively close to the release paper tangent line L formed on one side of the second label portion 102, and the distance between the second release paper block 152 and the release paper tangent line L The distance d2 may be greater than about 0 mm, so that the second release paper block 152 may be spaced apart from the tangent line L of the release paper. For example, the distance d2 between the second release paper block 152 and the tangent line L of the release paper may be about 2.5 mm.

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

Referring to FIGS. 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 cell 10 is accommodated. In the length direction of the release paper block 150, a center position at which the release paper tangent line L is formed may be closer to the release paper block 150 than an edge along which the folded portion (f) is formed. For example, the distance d12 between the first release paper block 151 and the second release paper block 152 may be greater than the distance r1 between the first release paper block 151 and the folded part (f) or the second release paper block 152 The distance r2 from the folded portion (f) is small. 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 part (f). However, the distance d12 between the first release paper piece 151 and the second release paper piece 152 may be equal to the distance r2 between the second release paper piece 152 and the folded part (f). Because the second end portion 12 of the battery cell 10 is more susceptible to bending or twisting that causes adhesion noise than the first end portion 11 of the battery cell 10 coupled to the circuit unit C, this is for The paper block 150 is placed closer to the second end portion 12 of the battery cell 10 than the first end portion 11 of the battery cell 10 to effectively reduce adhesion noise.

Referring to FIGS. 3 and 4 , perforations or thin portions having a relatively small thickness may be formed in the release paper sheet 200 along the contour T of the first release paper block 151 and the second release paper block 152 to facilitate the second release paper block. The first release paper block 151 and the second release paper block 152 are separated from the release paper sheet 200 . When the first release paper piece 201 and the second release paper piece 202 are separated from the label sheet 100, the first release paper piece 151 and the second release paper piece 152 can be separated from the first release paper piece 201 and the second The release paper sheet 202 is separated. For example, when the first release paper sheet 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 sheet 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 the three battery cells 10 and may be attached to the three battery cells 10, and two release paper pieces 150 may be provided on the label sheet 100, so that In this way, 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 block 151 may include two first release paper blocks 151 spaced apart from each other in the arrangement direction of the battery cells 10, and similarly, the second release paper block 152 may be included in the battery cell 10. Two second release paper blocks 152 spaced apart from each other in the arrangement direction of the body 10 . In the present disclosure, the number of battery cells 10 is not limited, and a release paper block 150 may be provided in each corresponding to the boundary between battery cells 10 adjacent to each other along the direction in which the battery cells 10 are arranged. edge portion 10ab.

As described above, according to one or more of the above embodiments, the release paper piece is provided at a predetermined position on the adhesive surface of the label sheet attached to the adjacent battery cell, thereby preventing the label sheet from being attached to the adjacent battery cell. Unstable adhesion at the boundary of the cell and adhesion noise that may occur when the label 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 a descriptive sense only and not for purposes of limitation. Descriptions of features or aspects within each embodiment should typically be considered as available for other similar features or aspects in other embodiments. Although one or more embodiments have been described with reference to the drawings, it will be understood by those of ordinary skill in the art that changes in form and details may be made therein without departing from the spirit and scope as defined by the claims. various changes.

Claims (16)

1. A 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 spanning the at least two battery cells extending and bonding the at least two battery cells together; and a release paper piece attached to the 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 major surfaces having relatively large areas and facing 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, and Wherein, the release paper piece 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 major surfaces adjacent to each other among the plurality of pairs of major surfaces, and A release liner is positioned along an edge portion between the plurality of major 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 covers 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. 4. The battery pack according to claim 2, wherein the release paper block extends to flat portions of the plurality of main surfaces in a width direction of the release paper block over the edge portion. 5. The battery pack according to claim 2, wherein the release paper block comprises: a first release paper block and a second release paper block spaced apart from each other along edge portions of the at least two battery cells Arrange in rows at open positions. 6. The battery pack of claim 5, wherein the first release liner and the second release liner have a relative central position extending through between the first release liner and the second release liner The symmetrical shape of the liner tangent. 7. The battery pack according to claim 6, wherein the first release paper piece and the second release paper piece are disposed at opposite positions spaced apart from a tangent line of the release paper. 8. The battery pack according to claim 5, wherein the label sheet comprises a first label portion and a second label portion separated from each other by a liner cut line forming the first label portion and the second label portion and extending through the center between the first release paper block and the second release paper block. 9. The battery pack according to claim 8, wherein the first label portion and the second label portion correspond to different regions of the label sheet arranged 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 one side and the other side formed on the first label portion opposite to each other in the length direction of the first release paper piece. the liner tangent on one of the sides, and The second release paper block is biased close to a liner tangent line formed on one of the side and the other side of the second label portion opposite to each other in the length direction of the second release paper block. 11. The battery pack according to claim 5, wherein the first release paper block and the second release paper block respectively comprise at least two second release paper blocks spaced apart from each other in the arrangement direction of the at least two battery cells. A release paper block and at least two second release paper blocks. 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 according to claim 12, wherein the release paper piece is provided in the form of an island isolated in an inner area of the label sheet. 14. The battery pack according to claim 1, wherein the release paper block has a bar shape having rounded ends along 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 sheet is separated from the label sheet, the release paper piece is separated from the release paper sheet in a state where 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, and is divided into a first release paper sheet and a second release paper sheet along a tangent line of the release paper, the label sheet includes a first label portion and a second label portion differentiated from each other along a liner tangent, and The release liner includes a first release liner and a second release liner attached to the first label portion and the second label portion, respectively.