Battery pack and method of manufacturing battery pack

Abstract

A battery pack and a method of manufacturing the battery pack are provided. The battery pack is provided with an adhesive tape unit and single batteries arranged on the two sides of the adhesive tape unit. The battery cells include: a first battery cell group disposed on a first surface of the tape unit; and a second battery cell group disposed on a second surface of the tape unit, in which the battery cells in the first battery cell group and the battery cells in the second battery cell group are alternately arranged with respect to a direction of the tape unit. The tape unit is folded in a zig-zag manner to form a battery cell stack.

Description

[0001] This application claims priority to and the benefit of Korean Patent Application No. 10-2024-0030907, filed on March 4, 2024, in the Korean Intellectual Property Office, the disclosure of which is incorporated herein by reference in its entirety. Technical Field

[0002] One or more embodiments relate to a battery pack. Background Art

[0003] Generally, unlike primary batteries, which cannot be recharged, secondary batteries are rechargeable and dischargeable. Secondary batteries are used as energy sources for mobile devices, electric vehicles, hybrid vehicles, electric bicycles, and uninterruptible power supplies. Depending on the type of external device to which the secondary battery is applied, the secondary battery can be used as a single cell or as a module in which the cells are connected and bundled into a single unit.

[0004] Small mobile devices, such as mobile phones, can operate for a limited period using the output of a single battery. However, when long-term operation or high-power operation is required, such as in electric or hybrid vehicles that consume large amounts of electricity, modules with multiple batteries are preferred due to output and capacity issues. The output voltage and current can be increased with the number of internal batteries. Summary of the Invention

[0005] One or more embodiments include a battery pack including a plurality of battery cells that is reliable even if dropped due to expansion spaces between the plurality of battery cells.

[0006] However, the technical problems to be solved by the present disclosure are not limited to the above problems, and those skilled in the art can clearly understand other problems not mentioned through the description herein.

[0007] Additional aspects 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 presented embodiments of the disclosure.

[0008] According to one or more embodiments, a battery pack includes a tape unit and battery cells arranged on a surface of the tape unit, wherein the battery cells include a first battery cell group arranged on a first surface of the tape unit and a second battery cell group arranged on a second surface of the tape unit, wherein the battery cells of the first battery cell group and the battery cells of the second battery cell group are arranged alternately with respect to a direction of the tape unit, and wherein the tape unit is folded in a zigzag manner to form a battery cell stack.

[0009] The tape unit may include a first layer formed in a rectangular shape and a second layer including a plurality of adhesive portions attached to one surface of the first layer at regular intervals, wherein the plurality of battery cells are disposed at positions corresponding to the plurality of adhesive portions.

[0010] The first layer may include a 1-1 layer forming one surface of the first layer and a 1-2 layer contacting the 1-1 layer and forming the other surface of the first layer, wherein the second layer may be attached to the 1-2 layer.

[0011] The 1-2 layer may include a first surface and a second surface, the adhesive may be formed only on the first surface, and the first surface may be adhered to the 1-1 layer.

[0012] The plurality of adhesive portions may include a first adhesive portion, a second adhesive portion, and a third adhesive portion, wherein each of the first adhesive portions may include a first portion and a second portion, the first portion being formed to correspond to an edge of one surface of one of the battery cells, and the second portion being formed to correspond to a center portion of the one surface of the one of the battery cells, wherein an opening is formed in the 1-2 layers, and each of the second portions may be formed to have a shape corresponding to one of the openings and formed at a position corresponding to the one of the openings. In other words, each of the second portions may be formed to have a shape corresponding to one of the openings in the 1-2 layers and positioned on the second layer to align with the opening of the 1-2 layers.

[0013] Layer 1-1 may include a first hole unit, and layer 1-2 may include a second hole unit, wherein the first hole unit and the second hole unit may be formed in shapes corresponding to each other and in positions corresponding to each other. In other words, the first hole unit and the second hole unit may have the same shape and may be positioned to align with (overlap) each other in layers 1-1 and 1-2.

[0014] The second layer may include: a plurality of first adhesive portions, each of the plurality of first adhesive portions including a first portion formed to correspond to an edge of a surface of one of the battery cells and a second portion formed to correspond to a center portion of the surface of the one of the battery cells; a plurality of second adhesive portions, each including a double-sided tape; and a third adhesive portion including a compressible member, wherein the second layer may be formed so that the plurality of first adhesive portions and the second adhesive portions are arranged in rows on the first layer at regular intervals in the direction of the tape unit.

[0015] The third adhesive portion may be provided only at one end of the second layer.

[0016] The first adhesive portion and the second adhesive portion may be alternately arranged in the direction of the tape.

[0017] The first adhesive portion, the second adhesive portion, and the third adhesive portion may each include adhesive materials on both sides thereof.

[0018] The second layer may include first adhesive portions arranged in rows at regular intervals in a direction of the tape unit.

[0019] The second layer may include: a plurality of second adhesive portions each including a double-sided tape; and a plurality of third adhesive portions each including a compressible member, wherein the plurality of second adhesive portions and the plurality of third adhesive portions are alternately arranged in a direction of the tape unit.

[0020] According to one or more embodiments, a battery pack includes a tape unit and battery cells arranged on a surface of the tape unit, wherein the battery cells may include a first battery cell group arranged on a first surface of the tape unit and a second battery cell group arranged on a second surface of the tape unit, wherein the battery cells of the first battery cell group are alternately arranged with the battery cells of the second battery cell group relative to a direction of the tape unit, wherein the tape unit is folded in a zigzag manner to form a battery cell stack, wherein the tape unit may include a first layer formed in a rectangular shape, a second layer including a plurality of adhesive portions attached to one surface of the first layer at regular intervals, wherein the plurality of adhesive portions include a first adhesive portion, a second adhesive portion, and a third adhesive portion, wherein each of the first adhesive portions may include a first portion formed to correspond to an edge of one surface of one of the battery cells and a second portion formed to correspond to a center portion of the one surface of the one of the battery cells, and the first portion may be formed to have a gap on one side.

[0021] According to one or more embodiments, the first portion of the first adhesive part may be formed to have a gap on one side.

[0022] A second aspect of the present disclosure relates to a method for manufacturing a battery pack, the method comprising the steps of: arranging a first battery cell group at regular intervals in a jig; assembling a first surface of a tape unit on the jig and adhering the first surface to the first battery cell group; and disposing a second battery cell group on a second surface of the tape unit, wherein the battery cells of the second battery cell group are arranged alternately with the battery cells of the first battery cell group.

[0023] The method may further include the following steps: before arranging the first battery cell group in the jig: stacking layer 1-2 on layer 1-1 to form a first layer of the tape unit (and layer 1-1 forms a first surface of the tape unit); and stacking a plurality of adhesive portions on layer 1-2 to form a second layer of the tape unit (and forming a second surface of the tape unit).

[0024] The step of assembling the first surface of the tape unit in the jig includes coupling the first hole unit and the second hole unit in the first layer of the tape unit to protrusions in the jig.

[0025]

[0011] Other aspects, features, and advantages in addition to those described above will become apparent from the detailed description, claims, and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The above and other aspects, features and advantages of certain embodiments of the present disclosure will become more apparent through the following description in conjunction with the accompanying drawings, in which: Figure 1 is an exploded view of a battery cell according to an embodiment; Figure 2 It is in assembled state Figure 1 A perspective view of a battery cell; Figure 3 is a diagram illustrating a process of manufacturing a tape unit and a plurality of battery cells adhered to the tape unit according to an embodiment; Figure 4 is a diagram illustrating a battery cell adhered to a tape unit and a folded structure of the tape unit according to an embodiment; Figure 5 is a diagram illustrating a structure in which battery cells adhered to a tape unit are folded in a zigzag manner to form a battery cell stack according to an embodiment; Figure 6 It is along Figure 5 A sectional view taken along line AA'; Figure 7 is a diagram showing an exploded perspective view of a tape unit according to an embodiment; Figure 8 (a) is a top view of a first bonding portion according to an embodiment, and Figure 8 (b) is a side view of a first bonding portion according to an embodiment; Figure 9 (a) is a top view of the second bonding portion according to the embodiment, and Figure 9 (b) is a side view of the second bonding portion according to the embodiment; Figure 10 (a) is a top view of a third bonding portion according to an embodiment, and Figure 10 (b) is a side view of a third bonding portion according to an embodiment; Figure 11 shows an exploded perspective view of a tape unit according to other embodiments; Figure 12 An exploded perspective view showing a tape unit according to other embodiments; and Figure 13 is a flowchart illustrating a method of manufacturing a battery pack according to an embodiment. DETAILED DESCRIPTION

[0027] 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 embodiments provided may have different forms and should not be construed as limited to the description set forth herein. Therefore, the embodiments are described below solely with reference to the accompanying drawings to illustrate various aspects of the present description. As used herein, the term "and / or" includes any and all combinations of one or more of the relevant listed items. Expressions such as "at least one of...", if following a list of elements, modify the entire list of elements, not the individual elements of that list.

[0028] Hereinafter, a battery pack according to an embodiment will be described in detail with reference to the accompanying drawings. Terms or words used in the specification and claims should not be interpreted as limited to their ordinary or dictionary meanings, but should be interpreted as meanings and concepts consistent with the technical concept of the present disclosure, based on the principle of definability of the concept that the inventor can appropriately define the term in order to best explain his or her invention. Therefore, the embodiments described in this specification and the configurations shown in the drawings are merely some of the most preferred embodiments of the present disclosure and do not represent the entire technical concept of the present disclosure. Therefore, it should be understood that various equivalents and modifications that can replace them may exist at the time of filing this application. In addition, when used herein, "including," "comprising," and / or their variations refer to the presence of the referenced features, shapes, numbers, steps, operations, components, elements, and / or groups thereof, and do not exclude the presence or addition of one or more other features, shapes, numbers, steps, operations, components, elements, and / or groups. In addition, when describing an embodiment of the present disclosure, "may" and its variations may include "one or more embodiments of the present disclosure."

[0029] In addition, to facilitate understanding of the disclosure, the accompanying drawings may not be drawn to scale, but the sizes of some components may be exaggerated. In addition, the same reference numerals may be assigned to the same components in different embodiments.

[0030] The statement that two compared objects are "the same" means that they are "substantially the same." Thus, substantially the same can include deviations that are considered low in the art, for example, less than 5%. In addition, the term "uniformity of a parameter in a certain area" can mean uniformity from an average perspective.

[0031] Although the first, second, etc. are used to describe various components, these components are of course not limited by these terms. These terms are only used to distinguish one component from another component, and unless specifically stated otherwise, the first component may also be the second component.

[0032] Throughout the specification, unless stated otherwise, each component may be singular or plural.

[0033] Any component placed on the "top (or bottom)" of a component means that any component is placed in contact with the top (or bottom) of the component, and may mean that other components may be placed between the component and any components disposed on (or under) the component.

[0034] In addition, when a component is described as being “connected,” “coupled,” or “combined” to another component, it should be understood that the components may be directly connected or combined with each other, but another component may be “interposed” between these components, or each component may be “connected,” “coupled,” or “combined” through other components. In addition, when a part is said to be electrically coupled to another part, this includes not only the case when the parts are directly connected, but also the case when the parts are connected via other intervening elements.

[0035] Unless otherwise stated, when "A and / or B" is mentioned throughout the specification, this means A, B, or A and B. That is, "and / or" includes all or any combinations of multiple listed items. Unless otherwise stated, when "C to D" is mentioned, this means C or higher and D or lower.

[0036] The terms used in this specification are used to describe the embodiments of the present disclosure and are not intended to limit the disclosure.

[0037] In the following, reference will be made to Figures 1 to 10 (b) describes a battery cell according to an embodiment.

[0038] Figure 1 shows an exploded view of a battery cell C according to an embodiment, Figure 2 It is in assembled state Figure 1 A perspective view of a battery cell C, Figure 3 shows a manufacturing process of a tape unit and a plurality of battery cells adhered to the tape unit according to an embodiment, Figure 4 shows a battery cell adhered to a tape unit and a folded structure of the tape unit according to an embodiment, Figure 5 shows a structure in which battery cells adhered to a tape unit are folded in a zigzag manner to form a battery cell stack according to an embodiment, Figure 6 It is along Figure 5 A cross-sectional view taken along line AA', Figure 7 shows an exploded perspective view of a tape unit according to an embodiment, Figure 8 (a) is a top view of a first bonding portion according to an embodiment, and Figure 8(b) is a side view of the first bonding portion according to the embodiment, Figure 9 (a) is a top view of the second bonding portion according to the embodiment, and Figure 9 (b) is a side view of the second bonding portion according to the embodiment, Figure 10 (a) is a top view of a third bonding portion according to an embodiment, and Figure 10 (b) is a side view of a third bonding portion according to an embodiment.

[0039] Reference Figure 1 and Figure 2 , the battery cell C includes an electrode assembly 10, a receiving portion A in which the electrode assembly 10 is received, and a sealing portion TS extending along an edge of the receiving portion A to seal the receiving portion A. The electrode assembly 10 may be formed in a wound shape by winding a first electrode plate 11 and a second electrode plate 12 arranged to face each other with a separator 13 located therebetween, or may be formed in a stacked form by stacking a plurality of first electrode plates 11 and second electrode plates 12 with the separator 13 located therebetween. An electrode tab 15 forming a charge and discharge path may be connected to the electrode assembly 10. The electrode tab 15 may include two electrode tabs 15 of different polarities electrically connected to the electrode assembly 10, and the electrode tab 15 connected to the electrode assembly 10 within the receiving portion A may be led out to the outside of the receiving portion through the front surface F of the receiving portion A.

[0040] The receiving portion A that receives the electrode assembly 10 may be formed in a generally rectangular parallelepiped shape. More specifically, the receiving portion A may include a front surface F from which the electrode tab 15 protrudes, a rear surface R facing away from the front surface F, a pair of main surfaces M connecting the front surface F and the rear surface R and having a relatively large area, and a pair of side surfaces D connecting the front surface F and the rear surface R and having a relatively small surface area. The main surface M may have the largest surface area among the surfaces of the receiving portion A and may be formed with an area larger than the front surface F, the rear surface R, and the side surfaces D. The front surface F, the rear surface R, and the pair of side surfaces D may be connected to the main surface M at different corners along the main surface M of the receiving portion A.

[0041] In an embodiment of the present disclosure, the main surface M and the side surface D may be formed in pairs at positions facing each other. For example, the main surface M may include a first main surface M1 and a second main surface M2 facing each other. Among the surfaces connecting the front surface F and the rear surface R, the surface with a relatively large surface area may correspond to the main surface M or the side surface M with a large surface area, and among the surfaces connecting the front surface F and the rear surface R, the surface with a relatively small surface area may correspond to the side surface M or the side surface D with a small surface area. Throughout this specification, the side surface D may represent a side surface D with a small surface area, specifically, unless a side surface M with a large surface area is mentioned, it may refer to a side surface D with a small surface area, and the side surface M with a large surface area may refer to the main surface M.

[0042] The battery cell C may further include a sealing portion TS formed along an edge of the accommodating portion A to seal the accommodating portion A. The accommodating portion A for accommodating the electrode assembly 10 and the sealing portion TS for sealing the accommodating portion A may be formed of an exterior material 20 continuously formed to surround the electrode assembly 10. That is, the exterior material 20 may surround the electrode assembly 10 and form the accommodating portion A for accommodating the electrode assembly 10, and the additional exterior material 20 remaining after the accommodating portion A is formed may form the sealing portion TS that seals the accommodating portion A.

[0043] The exterior material 20 may include a flexible exterior material 20 such as a layered structure, more specifically, a metal layer 20a such as an aluminum sheet and an insulating layer 20b such as a resin coating formed on both surfaces of the metal layer 20a. At this time, the metal layer 20a may be exposed to the outside through a cross-section where the exterior material 20 ends. As described below, the metal layer 20a may be exposed through the edge of the sealing portion TS, where the first exterior material 21 and the second exterior material 22 are combined to face each other with the electrode assembly 10 located therebetween. However, the metal layer 20a is not located at the edge of the folded portion 25 that connects the first exterior material 21 and the second exterior material 22.

[0044] In an embodiment of the present disclosure, the exterior material 20 may include a first exterior material 21 and a second exterior material 22, which are combined to face each other with the electrode assembly 10 located therebetween. The electrode assembly 10 may be positioned between the first exterior material 21 and the second exterior material 22, and the first exterior material 21 and the second exterior material 22 may be folded to overlap each other by a folding portion 25 connecting the first exterior material 21 and the second exterior material 22. The portions in contact with each other may be bonded to each other along the edge regions of the first exterior material 21 and the second exterior material 22 by thermal fusion or the like. Therefore, the inner regions of the first exterior material 21 and the second exterior material 22 facing each other with the electrode assembly 10 located therebetween may be formed as an accommodating portion A, and the edge regions of the first exterior material 21 and the second exterior material 22 bonded to each other may be formed as a sealing portion TS.

[0045] The sealing portion TS can be formed continuously along the edge regions of the first and second exterior materials 21 and 22, excluding the folded portion 25. More specifically, the sealing portion TS can include a table portion T extending in the direction of the front surface F of the accommodating portion A and a side sealing portion S extending in the direction of the side surface D of the accommodating portion A. The electrode tab 15 connected to the electrode assembly 10 within the accommodating portion A can be pulled out of the accommodating portion A through the table portion T extending in the direction of the front surface F of the accommodating portion A. In addition, a protection circuit module can be placed on the table portion T, and the electrode tab 15 pulled out through the table portion T can be bent to connect to the protection circuit module placed on the table portion T.

[0046] The side seal portion S may include a main body Sb at a position corresponding to the accommodating portion A and a front end portion Sa extending from the main body Sb to a position outside the accommodating portion A. The side seal portion S can be folded toward the accommodating portion A to reduce the area occupied by the entire battery cell C, and the side seal portion S can be folded toward the accommodating portion A through a first fold and a second fold. That is, in the first fold, the main body Sb of the side seal portion S at a position corresponding to the accommodating portion A and the front end portion Sa of the side seal portion S at a position outside the accommodating portion A are folded together. After the first fold, a second fold may be performed, wherein the front end portion Sa is folded to be concavely recessed toward the edge where the front surface F of the accommodating portion A and the table portion T contact each other. Through the first fold and the second fold, the main body Sb of the side seal portion S is folded toward the side surface D of the accommodating portion A and can be placed on the side surface D. In the side seal portion S, the front end portion Sa can form a dog-ear shape that is concavely recessed toward the edge formed by the front surface F of the accommodating portion A and the table portion T.

[0047] At the edge of the side seal portion S, the metal layer 20a may be exposed through a cross-section where the outer material 20 forming the side seal portion S ends. Because the main body Sb of the side seal portion S is folded onto the side surface D of the accommodating portion A, the metal layer 20a exposed through the edge of the main body Sb may not protrude from the side surface D of the accommodating portion A. The front end portion Sa of the side seal portion S is folded so as to be concavely recessed toward the edge formed by the front surface F of the accommodating portion A and the table portion T. Therefore, the metal layer 20a exposed through the edge of the front end portion Sa of the side seal portion S may not protrude from the front surface F of the accommodating portion A. That is, the side seal portion S may not protrude from the side surface D of the accommodating portion A and the front surface F of the accommodating portion A, and may be folded into a shape that follows the outer shape of the accommodating portion A, while the main body Sb of the side seal portion S is folded onto the side surface D of the accommodating portion A and the front end portion Sa of the side seal portion S is folded toward the edge where the table portion T and the front surface F of the accommodating portion A contact each other.

[0048] In embodiments of the present disclosure, the outer shape of the battery cell C can generally follow the outer shape of the accommodating portion A, and the outer surfaces of the accommodating portion A (i.e., the front surface F, rear surface R, main surface M, and side surfaces D of the accommodating portion A) can generally represent the outer surfaces of the battery cell C. The battery cell C may also include a sealing portion TS that seals the accommodating portion and accommodates the electrode assembly 10 therein. The sealing portion TS (i.e., at least the side sealing portion S) can be folded toward the side surfaces D and front surface F of the accommodating portion A to minimize the area occupied by the battery cell C. Therefore, the outer shape of the battery cell C can generally follow the outer shape of the accommodating portion A, and thus, the front surface F, rear surface R, main surface M, and side surfaces D of the accommodating portion A can generally represent the front, rear, main, and side surfaces of the battery cell C. A table portion T can be formed at the front of the battery cell C and can take the form of a plate rather than a surface, so that the protection circuit module is mounted thereon. If the outer shape of the battery cell C is considered to be approximately rectangular, the front face of the battery cell C can represent the front surface F of the accommodating portion A.

[0049] Reference Figures 3 to 10A battery pack according to an embodiment may include a tape unit 100 and a plurality of battery cells C disposed on two (opposing) surfaces of the tape unit 100. The plurality of battery cells C may include a first battery cell group CG1 disposed on a first surface 100a of the tape unit 100 and a second battery cell group CG2 disposed on a second surface 100b of the tape unit 100. The battery cells C of the first battery cell group CG1 may be arranged alternately with the battery cells C of the second battery cell group CG2, centered around the tape unit 100 (e.g., along the extending direction of the tape unit 100). The tape unit 100, on which the first battery cell group CG1 and the second battery cell group CG2 are disposed, may be folded in a zigzag pattern to form a battery cell stack 1000.

[0050] The tape unit 100 may include a first layer 110 and a second layer 120, the first layer 110 being integrally formed into a rectangular shape, in the second layer 120, a plurality of adhesive portions 121, 122, and 123 being attached to one surface of the first layer 110 at regular intervals, wherein a plurality of battery cells C may be respectively arranged at positions corresponding to the plurality of first adhesive portions 121, the second adhesive portions 122, and the third adhesive portions 123.

[0051] Typically, the adhesive tape used to join battery cells C is placed between multiple stacked battery cells. Because multiple adhesive tapes need to be individually attached between the multiple battery cells, the production speed of the battery pack is reduced. Specifically, the multiple adhesive tape materials need to be managed separately, and a clamp is required each time a separate adhesive tape is attached between battery cells. After attaching one surface of a unit tape to one surface of a battery cell, the battery cell with the attached unit tape needs to be stored separately before attaching other battery cells to the other surface of the unit tape. Therefore, in the prior art, the production speed of the battery pack is reduced.

[0052] Therefore, in an embodiment of the present disclosure, an integrated tape unit 100 may be provided by attaching a plurality of adhesive portions 121 , 122 , and 123 of different shapes and different materials to the first layer 110 of an integrally formed single rectangular tape.

[0053] The plurality of adhesive portions 121 , 122 , and 123 of different shapes and different materials can be easily attached to the plurality of battery cells C at a time using the jig J. Compared to the case of attaching the adhesive tape to each individual product, by attaching the plurality of adhesive portions to the plurality of battery cells at a time using the first adhesive portion 121 , the second adhesive portion 122 , and the third adhesive portion 123 attached to the integrated adhesive tape, the production speed of the battery pack can be improved.

[0054] According to an embodiment, the first layer 110 may include a 1-1 layer 111 forming one surface of the first layer 110 and a 1-2 layer 112 contacting the 1-1 layer 111 and forming the other surface of the first layer 110. The second layer 120 is attached to the 1-2 layer 112.

[0055] The first layer 111 may be a release paper. In this case, the first layer 111 may be made of polyethylene terephthalate (PET). For example, the first layer 110 may be made of a non-bubble-forming PET material to prevent bubbles from forming between the first layer 112 and the first layer 111, thereby maintaining the compactness of the battery pack.

[0056] The 1-2 layer 112 may include a PET material, and the 1-1 layer 111 may be attached to the 1-2 layer 112. The 1-2 layer 112 may form a main skeleton unit integrally formed in a rectangular shape so that the tape unit 100 has a longitudinal direction. The 1-2 layer 112 may include a PET material.

[0057] The 1-2 layer 112 may include a first surface 1121 and a second surface 1122. According to an embodiment, the adhesive material is formed only on the first surface 1121 of the 1-2 layer 112, and the first surface 1121 may be bonded to the 1-1 layer 111. A first adhesive portion 121, a second adhesive portion 122, and a third adhesive portion 123 (to be described later) may be attached to the second surface 1122.

[0058] In the manufacturing process, the 1-1 layer 111 and the 1-2 layer 112 are first combined to form the first layer 110, and the first adhesive portion 121, the second adhesive portion 122, and the third adhesive portion 123 may be adhered to the second surface 1122 of the 1-2 layer 112 of the first layer 110. As shown in the drawings, because the area of ​​the second surface 1122 is larger than the areas of the first adhesive portion 121, the second adhesive portion 122, and the third adhesive portion 123, the adhesive material is not applied to all portions of the second surface 1122. Therefore, the first adhesive portion 121, the second adhesive portion 122, and the third adhesive portion 123 can be attached to the second surface 1122 without an adhesive component by using the adhesive material formed on the surfaces of the first adhesive portion 121, the second adhesive portion 122, and the third adhesive portion 123.

[0059] According to an embodiment, the second layer 120 may include a first adhesive portion 121, a second adhesive portion 122, and a third adhesive portion 123. The first adhesive portion 121 may include a first portion 121a and a second portion 121b. The first portion 121a is formed to correspond to the edge of one surface of the battery cell C, and the second portion 121b is formed to correspond to the center portion of the one surface of the battery cell C. The first portion 121a may be formed to be harder than the second portion 121b. That is, the first portion 121a may include a hard material, and the second portion 121b may include a soft material. In other words, the first portion 121a may include a harder material than the material of the second portion 121b. For example, the first portion 121a may include hard rubber, compared to sponge. If the battery pack is dropped, the first portion 121a including hard rubber can absorb the impact. The second portion 121b may include a compressible material. For example, the second portion 121b may include sponge. If one or more battery cells C expand, the expansion can be effectively absorbed by the second portion 121b including the sponge material. Therefore, the first adhesive portion 121 may include different materials for the first portion 121a and the second portion 121b, and the first adhesive portion 121 including the first portion 121a and the second portion 121b including different materials is provided on the second layer 120 to form a single layer. With such a configuration, if the battery pack including the battery cell stack 1000 is dropped, the shock caused by the drop is absorbed by the first portion 121a including the hard material, and if one or more battery cells C swell, particularly the center portion of the one surface of the battery cell C swells, the second portion 121b provided at a position corresponding to the swollen portion absorbs the expansion of the battery cell C.

[0060] Furthermore, the first portion 121 a for ensuring durability and the second portion 121 b for absorbing expansion form only one layer between the battery cells C. Therefore, the volume of the battery pack can be prevented from increasing, and thus a compact battery pack structure can be manufactured.

[0061] First opening 112a may be formed in 1-2 layer 112, and second portion 121b may be formed in a corresponding shape at a position corresponding to first opening 112a. That is, second portion 121b of second layer 120 may directly contact 1-1 layer 111, which serves as release paper, through first opening 112a formed in 1-2 layer 112. Therefore, second portion 121b, which includes a compressible material such as a sponge, can secure additional compressible space through first opening 112a and can absorb expansion of battery cell C to a greater extent when expansion occurs.

[0062] According to an embodiment, the first portion 121a may be formed to surround the second portion 121b. The first portion 121a may be disposed between the battery cells C at a position corresponding to the edge of the battery cell C. That is, the first portion 121a may be formed at an edge of the battery cell C, where it can absorb any impact received by the battery cell C when the battery pack is dropped. In addition, the second portion 121b is disposed at the center of one surface of the battery cell C, where expansion is likely to occur, and can effectively absorb the expansion of the battery cell C.

[0063] According to this embodiment, the first portion 121a and the second portion 121b can be arranged so as to be separated from each other by a gap G2 (second gap G2). When the first portion 121a is compressed by pressure between the battery cells C, the first portion 121a can expand in a direction perpendicular to the compression direction. Similarly, the second portion 121b can receive the expansion pressure of the battery cells C and expand in a direction perpendicular to the expansion pressure. If the first and second portions 121a, 121b expand in a direction perpendicular to the direction in which they receive pressure, interference may occur between the first and second portions 121a, 121b. As a result, the battery pack's shock absorption and the expansion absorption of the battery cells C may not be properly performed. Therefore, the second gap G2 is formed between the first and second portions 121a, 121b to prevent interference between the two components when the first and second portions 121a, 121b expand in a direction perpendicular to the direction in which they receive pressure from the battery cells C. The second gap G2 can be formed, for example, to be 1 mm or larger. If the second gap G2 is less than 1 mm, the gap between the first portion 121 a and the second portion 121 b may be filled and mutual interference may occur.

[0064] According to an embodiment, the first portion 121a can be formed with a gap G1 (first gap G1) including a cutout portion 130 cut out on one side. The second portion 121b can expand in a direction perpendicular to the direction of the expansion pressure from the battery cell C. When the second portion 121b expands, the first portion 121a can receive pressure from the second portion 121b in a direction perpendicular to the direction of the pressure from the battery cell C. If the first portion 121a is formed in a ring shape, and if pressure is applied to the ring shape from the center, the ring shape may not be able to withstand the pressure and may be damaged. Therefore, since the first gap G1 is formed by cutting out one side of the first portion 121a (having a ring shape), when the expansion pressure received by the second portion 121b from the battery cell C is transmitted to the first portion 121a, the first portion 121a is not damaged. That is, the first gap G1 increases as the pressure transmitted from the second portion 121b is absorbed by the first portion 121a, and only slight deformation occurs in the first portion 121a to the extent that the first gap G1 widens. In addition, when the second portion 121b is pressed by the expansion of the battery cell C, the second portion 121b is pushed into the space of the first gap G1, and the shape of the first adhesive portion 121 can be functionally maintained.

[0065] According to an embodiment, the 1-1 layer 111 may include a first hole unit 111b and the 1-2 layer 112 may include a second hole unit 112b, wherein the first hole unit 111b and the second hole unit 112b may be formed at corresponding positions and in shapes corresponding to each other.

[0066] The jig protrusion JP of the jig J can be formed into a shape corresponding to the first hole unit 111b and the second hole unit 112b. In addition, the first hole unit 111b of the 1-1 layer 111 and the second hole unit 112b of the 1-2 layer 112 can be combined by fitting into the jig protrusion JP of the jig J. In this way, the 1-1 layer 111 and the 1-2 layer 112 constituting the first layer 110 can be fixed to the set position of the jig J. In a state where the 1-1 layer 111 and the 1-2 layer 112 are fixed at the set position, the second layer 120 and the battery cell C can be attached to the set position of the first layer 110. Therefore, the battery cell C, the first layer 110, and the second layer 120 can be accurately attached to each other at the set position.

[0067] According to an embodiment, the second layer 120 may include a first adhesive portion 121 including a first portion 121a formed to correspond to an edge of one surface of the battery cell C and a second portion 121b formed to correspond to a central portion of the one surface of the battery cell C. The second layer 120 may also include a second adhesive portion 122 and a third adhesive portion 123, the second adhesive portion 122 including a double-sided tape and the third adhesive portion 123 including a compressible member. The second layer 120 may be formed into a structure in which a plurality of adhesive portions 121, 122, and 123 are arranged in a row at regular intervals on the first layer 110. Both surfaces of the first adhesive portion 121, the second adhesive portion 122, and the third adhesive portion 123 may include an adhesive B.

[0068] Reference Figure 7 , the third adhesive portion 123 may be provided only at one of the two ends of the second layer 120. The surfaces on both sides of the third adhesive portion 123 may include an adhesive material. The third adhesive portion 123 may include a compressible member capable of absorbing expansion but does not include a hard member (such as the first portion 121a of the first adhesive portion 121). Therefore, if the tape unit 100 having the first battery cell group CG1 and the second battery cell group CG2 provided thereon is folded into a zigzag shape to form the battery cell stack 1000, then since the third adhesive portion 123 may be located only at one of the two ends of the second layer 120, the battery cells C may be located only on one side of the third adhesive portion 123.

[0069] Reference Figure 7 , the first adhesive portion 121 and the second adhesive portion 122 may be arranged alternately. In this case, when the tape unit 100 is Figure 4 Fold in a zigzag manner to form Figure 5 When the battery cell stack 1000 is formed, a structure is obtained in which one surface of a battery cell C contacts the first adhesive portion 121 and the other surface of the battery cell C contacts the second adhesive portion 122. Here, the second adhesive portion 122 may have a smaller thickness than the thickness of the structure of the first adhesive portion 121 and the third adhesive portion 123 (see FIG. Figure 8 (b) Figure 9 (b) and Figure 10 (b)) Double-sided tape structure.

[0070] In the depicted embodiment, when the battery pack falls, the impact is absorbed by the tape unit 100, and the expansion of the battery cells C is also absorbed by the tape unit 100. In addition, due to the tape structure, particularly due to the small thickness of the second adhesive portion 122, the battery pack can be compact by having a reduced overall volume.

[0071] Figure 11 Exploded perspective view showing a tape unit according to other embodiments Reference Figure 11 , the second layer 120' may include first adhesive portions 121' arranged in rows at regular intervals. That is, in these embodiments, the second layer 120' includes only the first adhesive portion 121' and does not include the second adhesive portion and the third adhesive portion. In this way, when the battery cell stack is formed by zigzag folding, the first adhesive portion 121' is placed on both sides of the battery cell C. Therefore, the absorption of expansion from the battery cell C can be improved by the second portion 121b', and the absorption of the impact if the battery pack falls can be further improved due to the first portion 121a'.

[0072] Figure 12 An exploded perspective view of a tape unit according to other embodiments is shown.

[0073] Reference Figure 12 , the second layer 120'' may include second adhesive portions 122'' and third adhesive portions 123'' arranged alternately. That is, in these embodiments, the second layer 120'' is constructed only with the second adhesive portions 122'' and the third adhesive portions 123'', but not with the first adhesive portions. In this way, when the battery cells C are stacked by zigzag folding, the second adhesive portions 122'' and the third adhesive portions 123'' are alternately arranged on both sides of the battery cells C, and the first portion 121a of the first adhesive portion including a hard material (as described above) is not placed between the battery cells C. Therefore, the volume of the battery pack can be reduced, making the battery pack more compact, and at the same time, the third adhesive portion 123'' can absorb the expansion that occurs between the battery cells C.

[0074] Reference Figure 13 , a method of manufacturing a battery pack according to an embodiment will be described. Figure 131 is a flowchart illustrating a method for manufacturing a battery pack according to an embodiment. The method for manufacturing a battery pack according to an embodiment may include: stacking a 1-2 layer 112 on a 1-1 layer 111 forming a first surface 100a of a tape unit 100 (S100); stacking a plurality of first adhesive portions 121, second adhesive portions 122, and third adhesive portions 123 on the 1-2 layer 112 so that the adhesive portions form a second surface 100b of the tape unit 100 (S200); arranging a first battery cell group CG1 at regular intervals in a jig J (S300); fixing the first surface 100a of the tape unit 100 on the jig J and adhering it to the first battery cell group CG1 (S400); disposing a second battery cell group CG2 on the second surface 100b of the tape unit 100 (S500); and folding the tape unit 100 so that battery cells of the second battery cell group CG2 are arranged alternately with battery cells of the first battery cell group CG1 (S600).

[0075] Fixing the first surface 100 a of the tape unit 100 on the jig J and adhering it to the first battery cell group CG1 ( S400 ) may include coupling the first and second hole units 111 b and 112 b of the first layer 110 of the tape unit 100 to jig protrusions JP of the jig J ( S410 ).

[0076] In this manner, by attaching the plurality of adhesive portions 121, 122, and 123 to the first layer 110 as the integrated tape, the plurality of adhesive portions can be attached to the plurality of battery cells C at once. After attaching the plurality of battery cells to the integrated tape, a battery cell stack can be formed simply by folding the integrated tape in a zigzag pattern, thereby improving the production speed of the battery pack.

[0077] Effects that can be achieved through the present disclosure are not limited to the above-mentioned effects, and those skilled in the art will clearly understand other technical effects that are not mentioned through the description herein.

[0078] Although the present disclosure has been described above with limited examples and drawings, the present disclosure is not limited thereto. Various modifications and changes may be made by those skilled in the art to which the present disclosure pertains within the scope of the equivalents of the present disclosure and the scope of the appended claims.

[0079] 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 generally be considered applicable to other similar features or aspects in other embodiments. Although one or more embodiments have been described with reference to the accompanying drawings, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the scope of this disclosure.

Claims

1. A battery pack, comprising: Tape unit; as well as A plurality of battery cells are arranged on the surface of the tape unit, Wherein, the plurality of battery cells include: a first battery cell group disposed on a first surface of the tape unit; and A second battery cell group is arranged on the second surface of the tape unit, The battery cells in the first battery cell group and the battery cells in the second battery cell group are arranged alternately relative to the direction of the tape unit, and The tape unit is folded in a Z-shape to form a battery cell stack.

2. The battery pack according to claim 1, wherein: The tape unit comprises: a first layer formed into a rectangular shape; and a second layer comprising a plurality of adhesive portions attached to one surface of the first layer at regular intervals, The plurality of battery cells are disposed at positions corresponding to the plurality of adhesive portions.

3. The battery pack according to claim 2, wherein: The first layer includes a 1-1 layer and a 1-2 layer, the 1-1 layer forming one surface of the first layer, the 1-2 layer being in contact with the 1-1 layer and forming the other surface of the first layer, and wherein the second layer is attached to the first-second layer.

4. The battery pack according to claim 3, wherein: The 1-2 layer includes a first surface and a second surface, wherein the adhesive is only on the first surface, and wherein the first surface is adhered to the 1-1 layer.

5. The battery pack according to claim 3, wherein: The plurality of adhesive portions include a first adhesive portion, a second adhesive portion, and a third adhesive portion, wherein each of the first adhesive portions includes: a first portion formed to correspond to an edge of one surface of one battery cell among the plurality of battery cells; and a second portion formed to correspond to a central portion of the one surface of the one battery cell among the plurality of battery cells, wherein a plurality of openings are formed in the 1-2 layer, and Each of the second portions is formed in a shape corresponding to one of the plurality of openings and is formed at a position corresponding to the one of the plurality of openings.

6. The battery pack according to claim 3, wherein: The 1-1 layer includes a first pore unit, and The 1-2 layer includes a second pore unit, The first hole unit and the second hole unit are formed in shapes corresponding to each other and are formed at positions corresponding to each other.

7. The battery pack according to claim 2, wherein: The second layer includes: a plurality of first adhesive portions, each of the plurality of first adhesive portions including a first portion corresponding to an edge of one surface of one battery cell among the plurality of battery cells and a second portion corresponding to a center portion of the one surface of the one battery cell among the plurality of battery cells; a plurality of second adhesive portions, each comprising a double-sided tape; and a third bonding portion comprising a compressible member, wherein the second layer is formed such that the plurality of first adhesive portions and the plurality of second adhesive portions are arranged in a row at regular intervals in the direction of the tape unit on the first layer.

8. The battery pack according to claim 7, wherein: The third adhesive portion is provided only at one end of the second layer.

9. The battery pack according to claim 7, wherein: The plurality of first adhesive portions and the plurality of second adhesive portions are alternately arranged in the direction of the tape unit.

10. The battery pack according to claim 7, wherein: The plurality of first adhesive portions, the plurality of second adhesive portions, and the third adhesive portion each include adhesive materials on both sides thereof.

11. The battery pack according to claim 2, wherein: The second layer includes a plurality of first adhesive portions, each of the plurality of first adhesive portions includes a first portion corresponding to an edge of a surface of one of the plurality of battery cells and a second portion corresponding to a center portion of the one surface of the one of the plurality of battery cells, and the plurality of first adhesive portions are arranged in rows at regular intervals in the direction of the tape unit.

12. The battery pack according to claim 2, in, The second layer includes: a plurality of second adhesive portions, each comprising a double-sided tape; and a plurality of third bonding portions, each comprising a compressible member, The plurality of second adhesive portions and the plurality of third adhesive portions are alternately arranged in the direction of the tape unit.

13. A battery pack, comprising: Tape unit; as well as A plurality of battery cells are arranged on the surface of the tape unit, The plurality of battery cells include: a first battery cell group disposed on a first surface of the tape unit; and a second battery cell group disposed on a second surface of the tape unit. The battery cells in the first battery cell group and the battery cells in the second battery cell group are arranged alternately relative to the direction of the tape unit. The tape unit is folded in a Z-shape to form a battery cell stack. wherein the tape unit includes: a first layer formed in a rectangular shape; and a second layer including a plurality of adhesive portions attached to one surface of the first layer at regular intervals, wherein the plurality of adhesive portions include a plurality of first adhesive portions, a plurality of second adhesive portions and a third adhesive portion, and Wherein, each of the plurality of first adhesive portions includes: a first portion formed to correspond to an edge of a surface of one of the plurality of battery cells; and a second portion formed to correspond to a central portion of the one surface of the one of the plurality of battery cells, and the first portion is formed to have a gap on one side.

14. A method for manufacturing a battery pack, the method comprising the steps of: arranging first battery cell groups at regular intervals in a jig; assembling a first surface of a tape unit on the jig and adhering the first surface to the first battery cell group; as well as A second battery cell group is arranged on the second surface of the tape unit, The battery cells of the second battery cell group are arranged alternately with the battery cells of the first battery cell group.

15. The method according to claim 14, further comprising the steps of: Before placing the first battery cell group in the fixture: stacking a 1-2 layer on a 1-1 layer forming a first surface of the tape unit to form a first layer of the tape unit, wherein the 1-1 layer forms the first surface of the tape unit; as well as A plurality of adhesive portions are stacked on the 1-2 layer to form a second layer of the tape unit, and form a second surface of the tape unit.

16. The method according to claim 15, wherein The step of assembling the first surface of the tape unit in the jig includes coupling a first hole unit and a second hole unit in the first layer of the tape unit to a protrusion in the jig.

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