Battery pack

Abstract

A battery pack includes: a battery cell; and a protection circuit module connected to the battery cell, the battery cell comprising: an electrode assembly; and an electrode tab extending from the electrode assembly, the protection circuit module including a substrate and a substrate tab connected to the substrate, the electrode tab including an electrode sealing portion extending from a case of the electrode assembly and an electrode bending portion extending from the electrode sealing portion, and a substrate tab formed to be disposed between the electrode bending portion and the substrate and formed to be in contact with the electrode bending portion and the substrate.

Description

Technical Field

[0001] This disclosure relates to battery packs. Background Technology

[0002] Secondary batteries are designed to be rechargeable and dischargeable, and can be used as an energy source for mobile devices, electric vehicles, hybrid vehicles, electric bicycles, uninterruptible power supplies, etc. Depending on the type of external device used, secondary batteries can be used as a single battery cell, or as a module or group in which multiple battery cells are connected and grouped into a unit.

[0003] Meanwhile, as applications using rechargeable batteries increasingly require larger capacities, the size of individual battery cells is also increasing to increase energy density. As a result, not only is the overall length of the battery pack, including the individual cells, increasing, but the overall size of the battery pack is also increasing. Summary of the Invention

[0004] Technical issues

[0005] This can reduce the overall length and size of the battery pack.

[0006] Solution to the problem

[0007] The battery pack includes battery cells and a protection circuit module connected to the battery cells. The battery cells include electrode assemblies and electrode tabs extending from the electrode assemblies. The protection circuit module includes a substrate and substrate tabs connected to the substrate. The electrode tabs include electrode sealing portions extending from the housing of the electrode assembly and electrode bending portions extending from the electrode sealing portions. The substrate tabs are formed to be disposed between the electrode bending portions and the substrate and to be in contact with the electrode bending portions and the substrate.

[0008] The substrate connector may include a substrate connection portion connected to the substrate and a substrate bending portion extending from the substrate connection portion and bending in the direction of the substrate based on the substrate connection portion.

[0009] The electrode bending portion may include: a first electrode bending portion extending from the electrode sealing portion; a second electrode bending portion extending from the first electrode bending portion and bending in the direction of the substrate based on the first electrode bending portion; and a third electrode bending portion extending from the second electrode bending portion and bending in the direction of the substrate based on the second electrode bending portion.

[0010] The bent portion of the third electrode can contact the substrate connection portion.

[0011] The bent portion of the second electrode can contact the bent portion of the substrate.

[0012] The bent portion of the third electrode can be arranged between the first strip and the substrate terminal block.

[0013] The substrate terminal block and the bent portion of the third electrode can be stacked in a single layer and arranged between the substrate and the first strip.

[0014] The third strip can be positioned between the curved electrode seal and the electrode assembly.

[0015] The fourth strip can be placed between the curved electrode sealing portion and the substrate.

[0016] Insulating tape can be placed between the electrode sealing section and the electrode bending section.

[0017] The first band may include a cover electrode assembly and a protection circuit module.

[0018] The thickness T1' of the first zone can be greater than the thickness T4' of the fourth zone.

[0019] The width LW3' of the substrate connector can be greater than the height LH3' of the substrate connector.

[0020] The width LW2' of the substrate can be greater than the height LH3' of the substrate.

[0021] The substrate may have a recessed portion into which a portion of the electrode terminal is inserted.

[0022] The electrode bending portion of the electrode tab may include: a first electrode bending portion extending from the electrode sealing portion; a second electrode bending portion extending from the first electrode bending portion and bending in the direction of the substrate based on the first electrode bending portion; and a third electrode bending portion extending from the second electrode bending portion and bending in the direction of the substrate based on the second electrode bending portion, and the second electrode bending portion may be inserted into the recessed portion.

[0023] The substrate connector can be inserted into the recessed portion.

[0024] The substrate connector may include: a substrate connecting portion connected to the substrate; and a substrate bending portion extending from the substrate connecting portion and bending in the direction of the substrate based on the substrate connecting portion, and the substrate bending portion may be inserted into the recessed portion.

[0025] The substrate may include a printed circuit board (PCB) portion and a molded portion covering the upper side of the PCB portion.

[0026] The recessed portion can be formed by recessing the PCB portion and the side surface of the molded portion of the substrate in the direction of the substrate's interior.

[0027] Beneficial effects of the invention

[0028] The battery pack is formed into a horizontal structure by bending the platform portion of the individual battery cells, thereby reducing the overall length of the battery pack, thus reducing the overall length and size of the battery pack and increasing the capacity of the battery pack. Attached Figure Description

[0029] Figure 1 The battery pack is shown.

[0030] Figure 2 yes Figure 1 An exploded perspective view of the battery pack.

[0031] Figure 3 It is an exploded perspective view of a single battery cell.

[0032] Figure 4 It is shown Figure 3 A diagram showing the assembly state of individual battery cells.

[0033] Figure 5 and Figure 6 It shows along Figure 1 The cross section intercepted by line A-A' in the diagram.

[0034] Figure 7 yes Figure 2 An enlarged view of the assembly state of part B.

[0035] Figure 8 and Figure 9 Another embodiment of the present disclosure is shown along Figure 1 The cross section intercepted by line A-A'.

[0036] Figure 10 Another embodiment of the present disclosure is shown along Figure 1 The cross section intercepted by line A-A'.

[0037] Figure 11 Is Figure 2 An exploded perspective view of a battery pack illustrating another embodiment of the present invention is shown in the figure.

[0038] Figure 12 yes Figure 11 A magnified view of the assembly state of part C.

[0039] Figure 13 , Figure 14 and Figure 15 Another embodiment of the present disclosure is shown along Figure 1 The cross section intercepted by line A-A'. Detailed Implementation

[0040] The mode of the present invention

[0041] The embodiments and corresponding methods of this disclosure can be understood by referring to the detailed description and accompanying drawings of the examples. The described embodiments have various modifications and can be implemented in different forms, and are not limited to the embodiments described herein. Furthermore, some or all of the features of the various embodiments of this disclosure can be combined with each other. Each embodiment can be implemented independently of or in relation to each other. The embodiments are provided by way of example to complete this disclosure and are intended to fully convey the ideas of this disclosure to those skilled in the art. Modifications or equivalent substitutions can be made to this disclosure within the spirit and scope of the disclosure. Therefore, processes, elements, and techniques not required for those skilled in the art to fully understand the embodiments of this disclosure are not described.

[0042] Unless otherwise stated throughout the drawings and description, the same reference numerals, letters, or combinations thereof denote the same components, and therefore redundant descriptions are omitted. Furthermore, for clarity of this disclosure, parts unrelated to the description have been omitted.

[0043] For clarity, the relative dimensions of elements, layers, and regions in the accompanying drawings may be exaggerated. Shaded lines and / or shading are typically provided in the drawings to clarify boundaries between adjacent elements. Therefore, the presence or absence of shading does not indicate specific materials, material properties, dimensions, ratios, commonalities between shown elements, or other characteristics, properties, or preferred forms or requirements regarding properties for unspecified elements.

[0044] This document describes various embodiments with reference to cross-sectional examples as illustrative examples of embodiments and / or intermediate structures. Therefore, for example, the appearance of the figures may vary due to manufacturing techniques and / or tolerances. Furthermore, the specific structural or functional descriptions disclosed herein are merely examples for explaining embodiments based on the concept of this disclosure. Therefore, the embodiments disclosed in this specification should not be construed as limited to the shape of the illustrated region and include variations, for example, depending on the manufacturing process.

[0045] The areas shown in the accompanying drawings are schematic, and their shapes are not intended to represent the actual shape of the device areas, nor are they intended to be limited thereto. Furthermore, as those skilled in the art will recognize, the described embodiments can be modified in various ways, provided they do not depart from the spirit or scope of this disclosure.

[0046] This document presents several specific details to provide a complete understanding of the various embodiments. However, various embodiments may be implemented without these specific details or by including one or more of them. Well-known structures and apparatuses are shown in block diagram form to avoid unnecessarily obscuring the various embodiments.

[0047] To facilitate the description of the relationship between an element or feature shown in the accompanying drawings and other elements or features, spatial relative terms such as “below,” “above,” “lower part,” and “upper part” are used in this specification. In addition to the orientations shown in the drawings, spatial relative terms are intended to encompass various orientations of the device in use or operation. For example, if the device in the drawings is flipped, an element described as “below,” “under,” or “below” other elements or features will be oriented as “above” other elements or features. Thus, as illustrative terms, “below” and “lower part” can include both the upper and lower directions. The device may be oriented in different directions (e.g., rotated 90° or another direction), and the spatial relative descriptions used herein should be interpreted accordingly. Similarly, when stating that a first part is “above” a second part, this means that the first part is above or below the second part.

[0048] Furthermore, the expression "viewed from a plane" means viewing the object from above, and the expression "in a schematic cross-sectional view" means a schematic cross-section taken by cutting the object vertically. The expression "viewed from the side" means that the first object can be above, below, or to the side of the second object, and vice versa. Additionally, the term "overlapping" can include layering, stacking, facing, extending, covering, or partially covering, or any other suitable terminology that will be understood and appreciated by one of ordinary skill in the art. The expression "non-overlapping" can include meanings such as "separated from" or "separated from," and any other suitable equivalent expression recognized and understood by one of ordinary skill in the art. The terms "facing" and "exposed" can indicate that the first object can directly or indirectly face the second object. When a third object exists between the first and second objects, it can be understood that the first and second objects face each other but indirectly.

[0049] When an element, layer, region, or component is referred to as "forming," "connecting," or "coupled" to another element, it can be said that it is formed directly on, on, or indirectly on another component, layer, region, or component, or indirectly formed on, connected to, or coupled to another component. It can also be collectively referred to as a direct or indirect combination or connection of elements, layers, regions, or components, as well as a bulk or non-bulk combination or connection, such that one or more elements, layers, regions, or components may be present. For example, when an element, layer, region, or component is referred to as "electrically connected" or "electrically coupled" to another element, layer, region, or component, the element, layer, region, or component may be directly electrically connected or electrically coupled to the other element, layer, region, or component, or intermediate elements, layers, regions, or components may be present. However, "directly connected to" or "directly combined with" means that one component is directly connected to or directly combined with another component without intermediate components, or the former is on the latter. Furthermore, in this specification, when a portion of a layer, film, region, plate, etc., is formed within another portion, the forming direction is not limited to the upward direction and includes the portion being formed on the side or bottom. Conversely, when a part of a layer, membrane, region, plate, etc., is formed "below" another part, this includes not only the case where the part is "directly" "below" the other part, but also the case where there are other parts between the two parts. Similarly, other expressions describing relationships between components, such as "between," "immediately between," "adjacent to," and "directly adjacent to," can be interpreted in a similar way. Furthermore, it will be understood that when an element or layer is referred to as being "between" two elements or layers, the element or layer can be the only element or layer between the two elements or layers, or there may be one or more intermediate elements or layers.

[0050] For the purposes of this disclosure, expressions such as “at least one” or “any one” do not limit the order of the elements. For example, “at least one of X, Y, or Z,” “at least one of X, Y, or Z,” “at least one selected from the group consisting of X, Y, and Z” can include a single X, a single Y, a single Z, and any combination of two or more of X, Y, and Z. Similarly, expressions such as “at least one of A and B” and “at least one of A or B” can include A, B, or A and B. In this specification, the term “or” generally includes “and / or,” and “and / or” includes any combination of one or more related list items. For example, expressions such as “A and / or B” can include A, B, or A and B.

[0051] Although the terms “first,” “second,” “third,” etc., may be used herein to describe various elements, components, regions, layers, and / or cross-sections, these elements, components, regions, layers, and / or cross-sections are not limited by these terms. These terms are used to distinguish one element, component, region, layer, or cross-section from another. Therefore, without departing from the spirit and scope of this disclosure, the first element, component, region, layer, or cross-section described below may be referred to as a second element, component, region, layer, or cross-section. The description of an element as a “first” element may not require or imply the presence of a second element or other elements. Terms such as “first,” “second,” etc., may be used in this disclosure to distinguish different categories or sets of elements. For clarity, the terms “first,” “second,” etc., may respectively represent “first category (or first set),” “second category (or second set),” etc.

[0052] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit this disclosure. As used herein, singular expressions are intended to include plural expressions, and plural expressions are intended to include singular expressions, unless the context clearly indicates otherwise. It will be further understood that, when used in this specification, the terms “comprising,” “having,” and “including” specify the presence of the stated features, integers, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0053] When one or more embodiments can be implemented differently, a particular process order can be performed differently than the described order. For example, two processes described consecutively can be performed substantially simultaneously, or they can be performed in the reverse order of the described order.

[0054] The terms “substantially,” “approximately,” “approximately,” and similar terms are used as terms of approximation, not of degree, and are intended to describe unique variations in the measured or calculated value as recognized by a person skilled in the art. As used herein, the terms “approximately” or “approximately” include the value and indicate a range of acceptable deviations (e.g., a range of deviations due to limitations of the measurement system) of a particular value as determined by a person skilled in the art, taking into account the measurement and associated errors. For example, “approximately” may mean within one or more standard deviations, or within ±30%, ±20%, ±10%, or ±5% of a specified value.

[0055] Unless otherwise defined, all terms used herein, including technical or scientific terms, shall have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure pertains. Terms such as those defined in commonly used dictionaries shall be interpreted as having a meaning consistent with their meaning in the context of the relevant technology and / or this disclosure, and shall not be idealized or interpreted in an overly formal sense unless expressly defined herein.

[0056] Figure 1 The battery pack is shown. Figure 2 yes Figure 1 An exploded perspective view of the battery pack. Figure 3 It is an exploded perspective view of a single battery cell. Figure 4 It is shown Figure 3 A diagram showing the assembly state of individual battery cells. Figure 5 and Figure 6 It shows along Figure 1 The cross section intercepted by line A-A' in the diagram. Figure 7 yes Figure 2 An enlarged view of the assembly state of part B.

[0057] The battery pack 10 is a pouch-type battery and may include individual battery cells 100 and a protection circuit module 200. For example, as... Figure 1 As shown, the battery pack 10 may have a front surface and a rear surface with a flat and uniform shape (e.g., parallel to...). Figure 1 The two surfaces of the YZ plane). At least a portion of the battery pack 10 may have a curved shape. For example, the two side surfaces of the battery pack 10 (e.g., Figure 1 The surface where the middle extension 240 is located and its opposite surface can have a curved shape. The battery pack 10 can have a shape in which, in the thickness direction (e.g., ...), Figure 1 The length in the X-axis direction is less than that in the width direction (e.g., Figure 1 The dimension of the length along the Y-axis.

[0058] The battery pack 10 includes a battery cell 100 and a protection circuit module 200 connected to the battery cell 100 and including a substrate 210. The battery cell 100 includes an electrode assembly 110 and a housing 140 surrounding the electrode assembly 110. The housing 140 includes a platform portion 1451 corresponding to the short side portion of the battery cell 100 and a pair of side sealing portions 1452 respectively connected to the two ends of the platform portion 1451 and corresponding to a pair of long side portions of the battery cell 100.

[0059] The battery pack 10 may include one or more strips for supporting and protecting the battery cells 100 and the protection circuit module 200. The one or more strips are attached to at least one of the battery cells 100 and the protection circuit module 200, and may include insulating material. For example, the one or more strips may be on the outer surface of the battery cell 100, between the battery cell 100 and the protection circuit module 200, or inside the protection circuit module 200. The strips may be components distinguishable from the insulating strip 130 of the battery cell 100.

[0060] The battery cell 100 may include an electrode assembly 110, an electrode terminal piece 120, an insulating strip 130, and a housing 140.

[0061] The electrode assembly 110 may include a first electrode plate 111 and a second electrode plate 112 having opposite polarities, and a separator 113 between the first electrode plate 111 and the second electrode plate 112. The electrode assembly 110 can be formed as a roll type by winding the first electrode plate 111, the second electrode plate 112, and the separator 113. For example, in the electrode assembly 110, the winding axis (e.g., the central axis of the winding of the first electrode plate 111, the second electrode plate 112, and the separator 113) may be parallel to the longitudinal direction of the battery cell 100 (e.g., ...). Figure 5 (in the Z-axis direction). Alternatively, the electrode assembly 110 can be formed by stacking multiple first electrode plates 111, second electrode plates 112, and diaphragms 113. Alternatively, the electrode assembly 110 can include a hybrid of wound and stacked types. The first electrode plate 111 can be a negative electrode, and the second electrode plate 112 can be a positive electrode. Alternatively, the first electrode plate 111 can be a positive electrode, and the second electrode plate 112 can be a negative electrode.

[0062] The first electrode plate 111 can be formed by applying a first electrode active material, such as graphite or carbon, to a first electrode current collector formed of a metal foil, such as copper, a copper alloy, nickel, or a nickel alloy. The first electrode plate 111 may include a first uncoated portion, which is a region where the first electrode active material is not applied, and at least a portion of the first uncoated portion may include a first electrode tab 121. The first electrode tab 121 can serve as a path for current flow between the first electrode plate 111 and the first current collector. During the manufacture of the first electrode plate 111, the first electrode tab 121 can be formed by a cutting process such that at least a portion of the first electrode plate 111 protrudes pre-exteriorly from the electrode assembly 110. Alternatively, without a separate cutting process, the first electrode tab 121 may protrude further beyond the diaphragm 113 from the electrode assembly 110.

[0063] The second electrode plate 112 can be formed by applying a second electrode active material, such as a transition metal oxide, to a second electrode current collector formed of a metal foil such as aluminum or an aluminum alloy. The second electrode plate 112 may include a second uncoated portion, which is a region where the second electrode active material is not applied, and at least a portion of the second uncoated portion may include a second electrode tab 122. The second electrode tab 122 can serve as a path for current flow between the second electrode plate 112 and the second current collector. During the manufacture of the second electrode plate 112, the second electrode tab 122 can be formed by a cutting process such that at least a portion of the second electrode plate 112 protrudes pre-exteriorly from the electrode assembly 110. Alternatively, without a separate cutting process, the second electrode tab 122 may protrude further beyond the electrode assembly 110 than the diaphragm 113.

[0064] The electrode assembly 110 may be surrounded by the housing 140. For example, as Figure 3 As shown, the electrode assembly 110 has a smaller size than the housing 140 and can be housed within the housing 140. When the electrode assembly 110 is housed within the housing 140, the electrode terminals 120 connected to the electrode assembly 110 can protrude to the outside of the housing 140 to connect to the protection circuit module 200.

[0065] Electrode tab 120 can be connected to electrode assembly 110. One end of electrode tab 120 can extend from electrode assembly 110. Electrode tab 120 can be led out from platform portion 1451 of housing 140 in a coupled state (e.g., first housing 141 and second housing 142 are in contact with each other). For example, as Figure 5 As shown, electrode terminals 120 may include a first electrode terminal 121 and a second electrode terminal 122 with different polarities. The first electrode terminal 121 and the second electrode terminal 122 may be electrically connected to the first electrode plate 111 and the second electrode plate 112, respectively. Furthermore, electrode terminals 120 may be connected to substrate terminals 220. For example, the first electrode terminal 121 may be connected to the first substrate terminal 221, and the second electrode terminal 122 may be connected to the second substrate terminal 222. Electrode terminals 120 may be connected to substrate terminals 220 by welding, bolting, etc. Electrode terminals 120 may include a conductive material such as metal. The first electrode terminal 121 and the second electrode terminal 122 are spaced apart from each other, and a first current collector and a second current collector may be welded and connected to the first electrode terminal 121 and the second electrode terminal 122, respectively.

[0066] Insulating tape 130 can be attached to electrode tab 120 to provide insulation and sealing between electrode tab 120 and housing 140. For example, as Figure 5As shown, the insulating tape 130 may surround at least a portion of the electrode tab 120. The insulating tape 130 may contact or be adjacent to the electrode assembly 110. For example, as Figure 4 As shown, the insulating tape 130 can be located on the outside of the platform portion 1451.

[0067] The electrode terminal 120 can be bent once or multiple times. When connected to the substrate terminal 220 of the protection circuit module 200, the electrode terminal 120 may not be in the longitudinal direction of the battery cell 100 (e.g., Figure 1 It extends straight along the Z-axis (direction) and can bend once or multiple times. For example, as Figure 2 and Figure 5 As shown, the electrode tab 120 can extend straight along the length direction of the battery cell 100, and then along the thickness direction of the battery cell 100 (e.g., Figure 2 The platform portion 1451 can also be bent in the same direction as the electrode terminal piece 120. While the electrode terminal piece 120 is bent, the fourth strip TP4 and the protection circuit module 200 can be sequentially positioned on the electrode terminal piece 120. Furthermore, the electrode terminal piece 120 can be bent again towards the substrate terminal piece 220 in the thickness direction of the battery cell 100. That is, the electrode terminal piece 120 includes multiple bent portions, and at least a portion of the protection circuit module 200, such as the substrate 210, can exist between the multiple bent portions. Because the electrode terminal piece 120 includes bent portions, the overall length of the battery cell 100 and the battery pack 10 can be reduced.

[0068] The electrode connector 120 may include an electrode sealing portion 1201 and an electrode bending portion 1202. The electrode bending portion 1202 may include a first electrode bending portion 1202a, a second electrode bending portion 1202b, and a third electrode bending portion 1202c.

[0069] The electrode tab 120 may include: an electrode sealing portion 1201 that extends from the electrode assembly 110 in the longitudinal direction of the battery cell 100 and is present in the platform portion 1451; a first electrode bending portion 1202a that bends at an end of the electrode sealing portion 1201 and has a portion present in the platform portion 1451; a second electrode bending portion 1202b that bends at an end of the first electrode bending portion 1202a; and a third electrode bending portion 1202c that bends at an end of the second electrode bending portion 1202b.

[0070] The electrode sealing portion 1201 may be a portion of the electrode terminal piece 120 extending from the electrode assembly 110. For example, as... Figure 5As shown, the electrode sealing portion 1201 extends from the electrode assembly 110 and is inserted between the platform portions 1451, and can be in the longitudinal direction of the battery cell 100 (e.g., Figure 5 Extends along the X-axis direction.

[0071] The first electrode bending portion 1202a may extend in a direction parallel to the direction in which the electrode sealing portion 1201 extends from its end. For example, the first electrode bending portion 1202a may extend from the end of the electrode sealing portion 1201 along the thickness direction of the battery cell 100 (e.g., Figure 5 (in the X-axis direction). For example, the first electrode bend 1202a can extend parallel to the electrode sealing portion 1201. The fourth strip TP4 can be arranged on the first electrode bend 1202a (in the X-axis direction). Figure 5 (In the Z-axis direction). A portion of the first electrode bending portion 1202a may be within the platform portion 1451, and the first electrode bending portion 1202a may be surrounded by the insulating tape 130. Another portion of the first electrode bending portion 1202a may be exposed outside the platform portion 1451 and the insulating tape 130. The first electrode bending portion 1202a may be spaced apart from the top surface of the housing 140 by the length of the portion before the electrode sealing portion 1201 is bent. A third tape TP3 may be disposed in the space between the first electrode bending portion 1202a and the housing 140.

[0072] The second electrode bending portion 1202b may extend from the end of the first electrode bending portion 1202a in a direction intersecting the extending direction of the first electrode bending portion 1202a. For example, the second electrode bending portion 1202b may extend from the end of the first electrode bending portion 1202a (e.g., Figure 5 The right end of the battery cell 100 is bent to be in the longitudinal direction of the battery cell 100 (e.g., Figure 5 It extends along the Z-axis direction. For example, the second electrode bending portion 1202b may extend perpendicularly to the first electrode bending portion 1202a. The length of the second electrode bending portion 1202b may be less than the length of the electrode sealing portion 1201.

[0073] The second electrode bending portion 1202b can be in the width direction of the battery pack 10 (e.g., Figure 9 The second electrode bending portion 1202b is located between the side surfaces of the substrate 210 and the first strip TP1 in the X-axis direction. The second electrode bending portion 1202b can be spaced apart from each of the side surfaces of the substrate 210 and the first strip TP1 so as not to interfere with the substrate 210 and the first strip TP1 even when subjected to an external impact. The second electrode bending portion 1202b can be located in the longitudinal direction of the battery pack 10 (e.g., in the X-axis direction). Figure 5The second electrode bend 1202b is located between the top surface of the battery cell 100 and the top surface of the first TP1 in the Z-axis direction. The second electrode bend 1202b can be spaced apart from each of the top surfaces of the battery cell 100 and the first TP1, so that the battery cell 100 and the first TP1 will not be disturbed even when an external impact is applied to them.

[0074] The third electrode bending portion 1202c may extend from the end of the second electrode bending portion 1202b in a direction intersecting the extending direction of the second electrode bending portion 1202b. For example, the third electrode bending portion 1202c may be bent at the top end of the second electrode bending portion 1202b to extend in the thickness direction of the battery cell 100. For example, the third electrode bending portion 1202c may extend perpendicular to the second electrode bending portion 1202b. The third electrode bending portion 1202c may be bent from the second electrode bending portion 1202b toward the first electrode bending portion 1202a. At least a portion of the first electrode bending portion 1202b and the third electrode bending portion 1202c may overlap each other in the longitudinal direction of the battery cell 100. The third electrode bending portion 1202c may be arranged on the substrate 210 of the protection circuit module 200.

[0075] The bent portion 1202c of the third electrode can be connected to the substrate terminal block 220. At least a portion of the bent portion 1202c of the third electrode can be inserted into the substrate terminal block 220 and can contact the substrate terminal block 220. Therefore, the electrode terminal block 120 and the substrate terminal block 220 can be electrically connected to each other.

[0076] The first electrode bending portion 1202a and the third electrode bending portion 1202c are spaced apart from each other, and at least a portion of the protection circuit module 200 and the strip can be arranged between the first electrode bending portion 1202a and the third electrode bending portion 1202c. For example, the first electrode bending portion 1202a and the third electrode bending portion 1202c extend parallel to each other (e.g., in the thickness direction of the battery cell 100 or in the direction of thickness). Figure 5 In the X-axis direction), the lengths of the second electrode bending portions 1202b can be spaced apart from each other. In addition, between the first electrode bending portions 1202a and the third electrode bending portions 1202c that are spaced apart from each other, there is a fourth strip TP4, a substrate 210 and a portion of the substrate connector 220 (e.g., substrate connection portion 2201).

[0077] Because the electrode tab 120 includes one or more bent portions, the dimensions of the battery cell 100 and the battery pack 10 in the longitudinal direction can be reduced. Furthermore, the protection circuit module 200 and the strip are located in the space formed between the multiple bent portions of the electrode tab 120, allowing the construction of the battery pack 10 to be concentrated in a relatively small space.

[0078] Although only the first electrode terminal piece 121 is shown in the accompanying drawings, the second electrode terminal piece 122 may also have the same bending structure and the same connection structure with the substrate terminal piece 220 as the first electrode terminal piece 121. That is, the second electrode terminal piece 122 may also include an electrode sealing portion 1201, a first electrode bending portion 1202a, a second electrode bending portion 1202b, and a third electrode bending portion 1202c.

[0079] refer to Figure 3 The housing 140 may include a flexible material. The housing 140 may include an insulating layer formed on any surface of a thin metal layer such as aluminum, and may be formed by a forming process such as drawing. The housing 140 houses the electrode assembly 110 therein, and the edges of the housing 140 may be sealed to prevent external foreign objects from flowing into the electrode assembly 110.

[0080] The housing 140 may include a first housing 141, a second housing 142, a folding portion 143, an internal space 144, and a sealing portion 145.

[0081] Each of the first housing 141 and the second housing 142 houses the electrode assembly 110 and can be folded relative to each other around a folding portion 143. The first housing 141 may include a first internal space 1441, and the second housing 142 may include a second internal space 1442. The first housing 141 and the second housing 142 can be connected to each other via the folding portion 143. When the electrode assembly 110 is housed in one of the two housings, the other housing covers the housing, forming an internal space 144 for housing the electrode assembly 110. For example, the folding portion 143 may be adjacent to a surface of the electrode assembly 110 opposite to the surface on which the electrode tabs 120 are formed.

[0082] A sealing portion 145 may be formed in each of the first housing 141 and the second housing 142. The sealing portion 145 may be formed along the outer edge of the first housing 141 and the outer edge of the second housing 142. For example, as... Figure 3As shown, a sealing portion 145 may be formed on each of a pair of long side portions of each of the first housing 141 and the second housing 142, and on a short side portion of each of the first housing 141 and the second housing 142 that does not form a folded portion 143, except for the other short side portion of each of the first housing 141 and the second housing 142 that forms a folded portion 143. When the first housing 141 and the second housing 142 are folded, the sealing portion 145 included in the first housing 141 and the sealing portion 145 included in the second housing 142 come into contact with each other to seal the space between the first housing 141 and the second housing 142.

[0083] The sealing portion 145 may include a platform portion 1451 and a side sealing portion 1452.

[0084] Platform portion 1451 is the portion from which electrode tab 120 extends, and can be formed corresponding to either of a pair of short side portions of housing 140. For example, platform portion 1451 can be formed adjacent to a surface of electrode tab 120 of electrode assembly 110 from which it extends, and can be formed above battery cell 100 in the longitudinal direction of battery cell 100. Platform portion 1451 can extend in a direction intersecting electrode tab 120 while sealing the first housing 141 and the second housing 142. Platform portion 1451 can surround at least a portion of electrode tab 120. For example, as... Figure 5 As shown, the platform portion 1451 may surround the portion of the electrode tab 120 extending from the electrode assembly 110. That is, the platform portions 1451 of the first housing 141 and the second housing 142 are in contact with each other, and the electrode sealing portion 1201 and the first electrode bending portion 1202a of the electrode tab 120 may pass between the contact surfaces between the platform portions 1451. The electrode tab 120 can be securely supported by the platform portion 1451.

[0085] refer to Figure 3 and Figure 4 The side sealing portion 1452 may extend in a direction intersecting the platform portion 1451. For example, the side sealing portion 1452 may be formed as a pair of long side portions respectively corresponding to the housing 140. Each of the side sealing portions 1452 may be connected to an end of the platform portion 1451 and an end of the folded portion 143. The platform portion 1451 and the pair of side sealing portions 1452 may intersect each other perpendicularly.

[0086] The platform portion 1451 and the side sealing portion 1452 can be folded. For example, as... Figure 4 As shown, when the first housing 141 and the second housing 142 are folded, the side sealing portions 1452 formed on a pair of long side portions of the battery cell 100 can be folded upwards (e.g., in...). Figure 4 (In the X-axis direction) Folding. With the pair of side sealing portions 1452 folded, the platform portion 1451 can also be folded upward. That is, after the pair of side sealing portions 1425 are folded upward toward the two side surfaces of the battery cell 100, the platform portion 1451 can be folded together with the electrode terminal piece 120 toward any surface of the battery cell 100.

[0087] Return to reference Figure 3 The protection circuit module 200 can control the charging and discharging operations of the battery cell 100 to prevent over-discharge and over-charge of the battery cell 100. The protection circuit module 200 can be connected to the battery cell 100 via the electrode connector 120. The protection circuit module 200 is located on the upper part of the battery cell 100 and, due to the presence of the strip, may not be in direct contact with other parts of the battery pack 10.

[0088] The protection circuit module 200 may include a substrate 210, a substrate connector 220, an extension portion 240, and a connector 250.

[0089] The substrate 210 supports other components of the protection circuit module 200 (e.g., substrate tabs 220, extensions 240, etc.) and may include circuit patterns and components. The substrate 210 may be a printed circuit board (PCB) or a flexible PCB (FPCB) and may be arranged on the battery cell 100. For example, as... Figure 5 As shown, substrate 210 can be located between the fourth strip TP4 and substrate terminal block 220. Substrate 210 can have a width direction (e.g., in the width direction of the battery cell 100) Figure 2 A rectangular shape extending along the Y-axis.

[0090] At least one substrate terminal block 220 may be placed on the substrate 210 and connected to the electrode terminal block 120. At least one substrate terminal block 220 includes a conductor that can be electrically connected to the electrode terminal block 120, and may include, for example, nickel, copper, aluminum, etc.

[0091] For example, such as Figure 2 As shown, two substrate terminals 220 can be located on the top surface of the substrate 210 and can be spaced apart from each other. The number of substrate terminals 220 can be the same as the number of electrode terminals 120. The substrate terminals 220 can be located at positions corresponding to the electrode terminals 120 and can be connected to the electrode terminals 120 by soldering or the like to electrically connect the battery cell 100 to the protection circuit module 200. The substrate terminals 220 may include a first substrate terminal 221 connected to the first electrode terminal 121 and a second substrate terminal 222 connected to the second electrode terminal 122.

[0092] The substrate connector 220 may include multiple bent portions. For example, the substrate connector 220 may include a substrate connection portion 2201, a first substrate bent portion 2202, and a second substrate bent portion 2203. For example, as... Figure 5 As shown, the substrate connection portion 2201 is located on the top surface of the substrate 210, and can be in the width direction of the substrate 210 (or the thickness direction of the battery cell 100 or...). Figure 5 The substrate connection portion 2201 may extend in the direction opposite to the direction in which the first substrate bending portion 2202 extends.

[0093] The first substrate bending portion 2202 is bent at the end of the substrate connecting portion 2201 and can extend in a direction different from the direction of the substrate connecting portion 2201. For example, the first substrate bending portion 2202 can extend in the height direction of the battery cell 100 (e.g., Figure 5 It extends along the Z-axis direction. The first substrate bending portion 2202 can be located on the substrate 210. The substrate connecting portion 2201 and the second substrate bending portion 2203 are spaced apart from each other by the first substrate bending portion 2202, and the electrode terminal 120 can be inserted between them.

[0094] The second substrate bending portion 2203 is bent at the end of the first substrate bending portion 2202, and can extend in a direction different from the direction of the first substrate bending portion 2202. For example, the second substrate bending portion 2203 can be in the thickness direction of the battery cell 100 (e.g., Figure 5 It extends in the Z-axis direction. At least a portion of the second substrate bending portion 2203 can overlap with the substrate connecting portion 2201 in the height direction of the battery cell 100. The second substrate bending portion 2203 can be connected to the electrode terminal piece 120. For example, as Figure 5 As shown, the bottom surface of the second substrate bending portion 2203 contacts the top surface of the third electrode bending portion 1202c, so that the electrode terminal block 120 and the substrate terminal block 220 can be connected to each other.

[0095] Although only the first substrate connector 221 is shown in the accompanying drawings, the second substrate connector 222 may also have the same bending structure and the same connection structure with the substrate connector 220 as the second substrate connector 221. That is, the second substrate connector 222 may also include a substrate connection portion 2201, a first substrate bending portion 2202, and a second substrate bending portion 2203.

[0096] The extension 240 connects the substrate 210 to the connector 250. For example, the extension 240 may have one end contacting the top surface of the substrate 210 and the other end connected to the connector 250. The extension 240 may have a width equal to or less than the width of the protection circuit module 200 and may include a deformable flexible material. The extension 240 extends downward along the side surface of the battery cell 100, and the connector 250 may be located at the end of the extension 240. The connector 250 connects the protection circuit module 200 to an external device of the battery pack 10, such as an application or controller.

[0097] The battery pack 10 may include a strip. The strip may be located between the battery cells 100 and the protection circuit module 200, or external to the battery cells 100 and / or the protection circuit module 200. The strip may be attached to at least one of the battery cells 100 and the protection circuit module 200. The strip insulates the battery cells 100 and the protection circuit module 200 from each other and protects them from external impacts. The strip comprises insulating and / or flame-retardant material and may include, for example, Teflon. The strip may include a first strip TP1, a second strip TP2, a third strip TP3, and a fourth strip TP4.

[0098] The second TP2 can be attached to both side surfaces of the battery cell 100. For example, as Figure 1 As shown, the second strip TP2 can be positioned between the extension 240 of the protection circuit module 200 and the battery cell 100. The second strip TP2 prevents direct contact between the extension 240 and the battery cell 100. The upper part of the second strip TP2 can be located on the top surface of the battery cell 100, and the lower part of the second strip TP2 can be located on the bottom surface of the battery cell 100. A pair of second strips TP2 can be attached to both sides of the battery cell 100, and can respectively cover a pair of corner portions of the battery cell 100.

[0099] The second strip TP2 can cover the sealing portion 145. For example, while folding the side sealing portion 1452, the second strip TP2 can cover the outer side of the side sealing portion 1452.

[0100] The first band TP1 can be located above the battery cell 100 to cover the protection circuit module 200 and the battery cell 100. For example, as Figure 1 As shown, when the battery cell 100 and the protection circuit module 200 are connected to each other, the first strip TP1 is placed on the protection circuit module 200 and can cover the upper part of the front and rear surfaces of the battery cell 100. Therefore, as Figure 5As shown, the first strip TP1 can be positioned to surround not only the component but also the protection circuit module 200 and the electrode tab 120. The first strip TP1 can be spaced apart from the protection circuit module 200 attached to the battery cell 100.

[0101] The third strip TP3 can be placed on top of the battery cell 100 before the electrode terminal 120 and platform portion 1451 are folded, so that the top of the battery cell 100 and the electrode terminal 120 do not directly contact each other. For example, as Figure 5 As shown, the third band TP3 can have the same width as the battery cell 100 (e.g., Figure 2 The length corresponding to the Y-axis direction can be placed at the top of the battery cell 100. In this state, the electrode terminals 120 and the platform portion 1451 can be folded toward the top surface of the housing 140 (e.g., the first housing 141), and the side sealing portions 1452 on both sides can also be folded inward.

[0102] The fourth strip TP4 can be placed on the electrode contact piece 120 and / or the insulating strip 130. For example, as... Figure 5 As shown, while the electrode tab 120 and platform portion 1451 are bent, a fourth strip TP4 can be placed on them. The fourth strip TP4 covers a portion of the electrode tab 120, the platform portion 1451, and the insulating strip 130, with side sealing portions 1452 located on both sides, thereby ensuring airtightness and insulation between the components.

[0103] According to this embodiment, reference Figure 7 The electrode sealing portion 1201 is bent between the substrate 210 and the housing 140, such that the first sealing surface 1201F1 of the electrode sealing portion 1201 corresponds to the housing surface 140F of the housing 140. Furthermore, the substrate 210 is arranged such that the substrate surface 210F of the substrate corresponds to the second sealing surface 1201F2 of the electrode sealing portion 1201.

[0104] As described above, the electrode sealing portion 1201 is bent in the direction of the housing surface 140F of the housing 140, thereby reducing the impact of bending on the housing surface 140F compared to the case where the electrode sealing portion 1201 is not bent and extends perpendicular to the housing surface 140F of the housing 140. Figure 6 The thickness T occupied by the electrode terminals and protection circuit module can be reduced. Therefore, the volume occupied by the electrode terminals and protection circuit module of the entire battery pack can be reduced, thereby reducing the overall length and size of the battery pack. At the same time, the volume of the electrode assembly can be increased relative to the same size, thereby increasing the capacity of the battery pack.

[0105] Furthermore, the substrate surface 210F of the substrate is arranged to correspond to the second sealing surface 1201F2 of the electrode sealing portion 1201, such that the substrate 210 is arranged on the opposite side of the housing 140 based on the curved electrode tab 120 instead of being arranged between the electrode tab 120 and the housing 140, thereby completely blocking the possibility of reduced battery efficiency caused by unnecessary electrical connection between the substrate 210 and the housing 140.

[0106] According to this embodiment, the substrate 210 includes a first substrate surface 210F1 arranged to correspond to a second sealing surface 1201F2 of the electrode sealing portion 1201, and a second substrate surface 210F2 formed on the opposite side of the first substrate surface 210F1. The second substrate surface 210F2 can be connected to the substrate terminal block 220. The substrate 210 can face the electrode sealing portion 1201 through the first substrate surface 210F1 and simultaneously cover the electrode sealing portion 1201 in the first direction D1. Furthermore, the substrate 210 can contact the substrate terminal block 220 through the second substrate surface 210F2, thereby electrically connecting to the substrate terminal block.

[0107] In this case, the second space portion 220a is formed in the substrate terminal block 220, and the end of the electrode bending portion 1202 can be arranged in the second space portion 220a to connect to the substrate terminal block 220.

[0108] More specifically, the substrate connector 220 includes: a substrate connection portion 2201 connected to the substrate 210; a first substrate bending portion 2202 extending from the substrate connection portion 2201 and bending in the direction of the substrate based on the substrate connection portion 2201; and a second substrate bending portion 2203 extending from the first substrate bending portion 2202 and bending in the direction of the substrate based on the first substrate bending portion 2202. In this case, the substrate connection portion 2201 and the second substrate bending portion 2203 are arranged facing each other, and a second space portion 220a can be formed between the substrate connection portion 2201 and the second substrate bending portion 2203.

[0109] Here, the electrode bending portion 1202 may include: a first electrode bending portion 1202a, which extends from the electrode sealing portion 1201; a second electrode bending portion 1202b, which extends from the first electrode bending portion 1202a and is bent in the direction of the substrate based on the first electrode bending portion 1202a; and a third electrode bending portion 1202c, which extends from the second electrode bending portion 1202b and is bent in the direction of the substrate based on the second electrode bending portion 1202b.

[0110] In this configuration, the third electrode bending portion 1202c can be connected to the second substrate bending portion 2203. Furthermore, the electrode sealing portion 1201 and the third electrode bending portion 1202c are formed facing each other, forming a first space 120a between the electrode sealing portion 1201 and the third electrode bending portion 1202c, and the substrate 210 can be placed on the first space 120a.

[0111] The third TP3 strip can be disposed between the curved electrode sealing portion 1201 and the housing 140. The third TP3 strip can remain adhered to both the electrode sealing portion 1201 and the housing 140.

[0112] The fourth TP4 strip can be disposed between the curved electrode sealing portion 1201 and the substrate 210. The fourth TP4 strip can remain adhered to both the electrode sealing portion 1201 and the substrate 210.

[0113] According to this embodiment, an insulating strip 130 can be arranged to surround the electrode bending portion 1202 and contact the electrode sealing portion 1201.

[0114] Therefore, the electrode bending portion 1202 extending from the electrode sealing portion 1201 can be prevented from contacting the substrate 210 or the housing 140 that houses the electrode assembly 110, so as to prevent the electrode bending portion 1202 and the electrode assembly 110 from being electrically connected to each other.

[0115] According to this embodiment, a first strip TP1 may be included, covering the housing 140 and the protection circuit module 200. In this case, the thickness T1 of the first strip TP1 can be greater than the thickness T3 of the fourth strip TP4. The first strip TP1 is formed to cover the electrode contact 120 and the protection circuit module 200, and can protect the electrode contact 120 and the protection circuit module 200 from external impacts. Therefore, the thickness of the first strip TP1 can be greater than the thickness of the fourth strip TP4, which is placed between the substrate 210 and the electrode sealing portion 1201 to insulate the two components of the substrate 210 and the electrode sealing portion 1201.

[0116] The width LW1 of the electrode terminal piece 120 can be greater than the height LH1 of the electrode terminal piece 120. Therefore, the thickness T occupied by the electrode terminal piece and the protection circuit module can be further reduced, thereby contributing to the compactness and capacity improvement of the battery pack.

[0117] Furthermore, the width LW2 of the substrate 210 can be greater than the height LH2 of the substrate 210. Therefore, the thickness T occupied by the electrode terminals and the protection circuit module can be further reduced, thereby contributing to the compactness and capacity improvement of the battery pack.

[0118] Furthermore, the width LW3 of the substrate terminal piece 220 can be greater than the height LH3 of the substrate terminal piece 220. Therefore, the thickness T occupied by the electrode terminal piece and the protection circuit module can be further reduced, thereby contributing to the compactness and capacity improvement of the battery pack.

[0119] The thickness T4 of the curved electrode sealing portion 1201 can be less than the thickness T2 of the substrate 210 and the substrate terminal piece 220. By bending the electrode sealing portion 1201 as much as possible to be less than the thickness T2 of the substrate 210 and the substrate terminal piece 220, the thickness T occupied by the electrode terminal piece and the protection circuit module can be further reduced, thereby contributing to the compactness and capacity improvement of the battery pack.

[0120] The height LH4 of the electrode sealing portion 1201 can be greater than the width LW4 of the electrode sealing portion 1201. Furthermore, the width LW2 of the substrate 210 can be greater than the width LW4 of the electrode sealing portion 1201. Therefore, the substrate 210 can... Figure 5 The electrode sealing portion 1201 is completely covered in the first direction D1 along the X-axis, thereby preventing the electrode sealing portion 1201 from contacting and electrically connecting with the substrate terminal block 220. Furthermore, the substrate 210 acts to press the bent electrode sealing portion 1201 in the direction where the housing 140 is located, so the electrode sealing portion 1201 can have a completely fixed structure in a bent state between the substrate 210 and the housing 140.

[0121] refer to Figure 8 and Figure 9 According to this embodiment, the substrate 210' of the battery pack 10' supports other components of the protection circuit module 200' (e.g., substrate tabs 220', etc.) and may include circuit patterns and components. The substrate 210' may be a printed circuit board (PCB) or a flexible PCB (FPCB) and may be arranged on a single battery cell. For example, as... Figure 8 As shown, substrate 210' can be located between the fourth strip TP4' and substrate connector 220'.

[0122] At least one substrate terminal block 220' may be located on substrate 210' and connected to electrode terminal block 120'. At least one substrate terminal block 220' includes a conductor that can be electrically connected to electrode terminal block 120', and may include, for example, nickel, copper, aluminum, etc.

[0123] For example, the number of substrate terminals 220' can be the same as the number of electrode terminals 120'. The substrate terminals 220' can be located at positions corresponding to the electrode terminals 120', and can be connected to the electrode terminals 120' by soldering or the like, so as to electrically connect the battery cell 100' to the protection circuit module 200'.

[0124] The substrate connector 220' may include multiple bent portions. For example, the substrate connector 220' may include a substrate connection portion 2201' and a substrate bent portion 2202'. For example, as... Figure 8 As shown, the substrate connection portion 2201' is located on the top surface of the substrate 210', and can be in the width direction of the substrate 210' (or the thickness direction of the battery cell or...). Figure 8 The substrate connecting portion 2201' extends in the direction perpendicular to the direction in which the substrate bending portion 2202' extends.

[0125] The substrate bending portion 2202' is bent at the end of the substrate connecting portion 2201' and can extend in a direction different from the direction of the substrate connecting portion 2201'. For example, the substrate bending portion 2202' can be in the height direction of the battery cell (e.g., Figure 8 It extends along the Z-axis direction.

[0126] The substrate terminal block 220' can be arranged between the electrode bending portion 1202' and the substrate 210'. The substrate terminal block 220' can contact the electrode bending portion 1202'.

[0127] The substrate connector 220' can contact the substrate 210'. The substrate connection portion 2201' of the substrate connector 220' can extend in a direction parallel to the third electrode bending portion 1202c' of the electrode bending portion 1202', and the substrate connection portion 2201' can contact the third electrode bending portion 1202c'. The substrate bending portion 2202' of the substrate connector 220' can extend in a direction parallel to the second electrode bending portion 1202b' of the electrode bending portion 1202', and the substrate bending portion 2202' can contact the second electrode bending portion 1202b'. The substrate bending portion 2202' can be spaced apart from the side surface portion of the substrate 210'.

[0128] The third electrode bending portion 1202c' of the electrode bending portion 1202' can contact the bottom surface portion of the center portion of the first strip TP1'. The third electrode bending portion 1202c' can be arranged between the first strip TP1' and the substrate terminal block 220'.

[0129] As described above, according to this embodiment, the substrate terminal block 220' is arranged between the electrode bending portion 1202' and the substrate 210' to contact each of the electrode bending portion 1202' and the substrate 210', thereby reducing the impact of the electrode bending portion 1202' and the substrate 210'. Figure 9The thickness T' occupied by the electrode terminals and protection circuit module can be reduced. Therefore, the volume occupied by the electrode terminals and protection circuit module of the entire battery pack can be reduced, thereby reducing the overall length and size of the battery pack. At the same time, the volume of the electrode assembly can be increased relative to the same size, thereby increasing the capacity of the battery pack.

[0130] The substrate connector 220' includes a substrate connection portion 2201' connected to the substrate 210' and a substrate bending portion 2202' extending from the substrate connection portion 2201' and bending in the direction of the substrate based on the substrate connection portion 2201'.

[0131] Here, the electrode bending portion 1202' may include a first electrode bending portion 1202a' extending from the electrode sealing portion 1201, a second electrode bending portion 1202b' extending from the first electrode bending portion 1202a' and bending in the direction of the substrate 210' based on the first electrode bending portion 1202a'; and a third electrode bending portion 1202c' extending from the second electrode bending portion 1202b' and bending in the direction of the substrate 210' based on the second electrode bending portion 1202b'.

[0132] In this configuration, the third electrode bending portion 1202c' can be connected to the substrate connection portion 2201'. Furthermore, the electrode sealing portion 1201' and the third electrode bending portion 1202c' are formed facing each other, forming a first space 120a' between the electrode sealing portion 1201' and the third electrode bending portion 1202c', and the substrate 210' can be placed on the first space 120a'.

[0133] The third strip TP3' can be disposed between the curved electrode sealing portion 1201' and the housing 140'. The third strip TP3' can remain adhered to both the electrode sealing portion 1201' and the housing 140'.

[0134] The fourth strip TP4' can be disposed between the curved electrode sealing portion 1201' and the substrate 210'. The fourth strip TP4' can remain adhered to the electrode sealing portion 1201' and the substrate 210'.

[0135] According to this embodiment, an insulating strip 130' can be arranged to surround the electrode bending portion 1202' and contact the electrode sealing portion 1201'.

[0136] Therefore, the electrode bending portion 1202' extending from the electrode sealing portion 1201' can be prevented from contacting the substrate 210 or the housing 140' that houses the electrode assembly 110', thereby preventing the electrode bending portion 1202' and the electrode assembly 110' from being electrically connected to each other.

[0137] According to this embodiment, a first strip TP1' may be included, covering the housing 140' and the protection circuit module 200'. In this case, the thickness T1' of the first strip TP1' can be greater than the thickness T3' of the fourth strip TP4'. The first strip TP1' is formed to cover the electrode contact 120' and the protection circuit module 200', and can protect the electrode contact 120' and the protection circuit module 200' from external impacts. Therefore, the thickness of the first strip TP1' can be greater than the thickness of the fourth strip TP4', which is placed between the substrate 210' and the electrode sealing portion 1201' to insulate the two components of the substrate 210' and the electrode sealing portion 1201'.

[0138] According to this embodiment, the thickness T2' of the substrate 210', substrate contact piece 220', and third electrode bending portion 1202c' can be minimized. That is, each of the substrate 210', substrate contact piece 220', and third electrode bending portion 1202c' is formed as a single layer, and the single-layer substrate 210', single-layer substrate contact piece 220', and single-layer third electrode bending portion 1202c' are stacked on top of each other to form a layered structure, and the thickness T2' formed by the substrate 210', substrate contact piece 220', and third electrode bending portion 1202c' can be minimized. Therefore, the thickness T' occupied by the electrode contact piece and protection circuit module can be further reduced, thereby contributing to the compactness and capacity improvement of the battery pack.

[0139] Specifically, each of the substrate terminal block 220' and the third electrode bent portion 1202c' is stacked in single layers and arranged between the substrate 210' and the first strip TP1'.

[0140] Furthermore, the substrate terminal piece 220' has a substrate connection portion 2201' with a width LW3' greater than the height LH3' of the substrate bending portion 2202', thereby minimizing the height LH3' of the substrate terminal piece 220'. Also, the substrate bending portion 2202' bends towards the side surface portion of the substrate 210', so that the height of the substrate bending portion 2202' is absorbed by the side surface portion of the substrate 210', thereby minimizing the height ratio of the substrate terminal piece 220' to the entire battery cell. In addition, the thickness T' occupied by the electrode terminal piece and the protection circuit module can be further reduced, thereby contributing to the compactness and increased capacity of the battery pack.

[0141] The width LW1' of the electrode terminal piece 120' can be greater than the height LH1' of the electrode terminal piece 120'. Therefore, the thickness T' occupied by the electrode terminal piece and the protection circuit module can be further reduced, thereby contributing to the compactness and capacity improvement of the battery pack.

[0142] Furthermore, the width LW2' of substrate 210' can be greater than the height LH2' of substrate 210'. Therefore, the thickness T' occupied by the electrode terminals and protection circuit module can be further reduced, thereby contributing to the compactness and capacity improvement of the battery pack.

[0143] Furthermore, the width LW3' of the substrate terminal piece 220' can be greater than the height LH3' of the substrate terminal piece 220'. Therefore, the thickness T' occupied by the electrode terminal piece and the protection circuit module can be further reduced, thereby contributing to the compactness and capacity improvement of the battery pack.

[0144] The height LH4' of the electrode sealing portion 1201' can be less than the width LW4' of the electrode sealing portion 1201'. Furthermore, the width LW2' of the substrate 210' can be greater than the width LW4' of the electrode sealing portion 1201'. Therefore, the substrate 210' can... Figure 8 The electrode sealing portion 1201' is completely covered in the first direction D1' along the X-axis, thereby preventing the electrode sealing portion 1201' from contacting and electrically connecting with the substrate terminal piece 220'. Furthermore, the substrate 210' acts to press the bent electrode sealing portion 1201' in the direction where the housing 140' is located, thus allowing the electrode sealing portion 1201' to have a fully fixed structure in a bent state between the substrate 210' and the housing 140'.

[0145] refer to Figures 10 to 12 According to another embodiment of this disclosure, a recessed portion 220a'' into which a portion of the electrode tab 120'' is inserted can be formed in the substrate 210''. A first recessed portion 221a'' and a second recessed portion 222a'' can be formed in the recessed portion 220a''. The substrate 210'' may include a PCB portion 210a'' and a molded portion 210b'' covering the upper side of the PCB portion. The recessed portion 222a'' can be formed by recessing the side surface portions of the PCB portion 210a'' and the molded portion 210b'' of the substrate 210'' in the internal direction of the substrate 210''.

[0146] The bent portion 1202'' of the electrode connector 120'' can be inserted into the recessed portion 220a''. The electrode connector 120'' may include a first electrode connector 121'' and a second electrode connector 122''. The first electrode connector 121'' can be inserted into the first recessed portion 221a''. The second electrode connector 122'' can be inserted into the second recessed portion 222a''.

[0147] Each of the first electrode tab 121'' and the second electrode tab 122'' may include an electrode sealing portion 1201'' and an electrode bending portion 1202''. The electrode bending portion 1202'' may include a first electrode bending portion 1202a'' extending from the electrode sealing portion 1201'', a second electrode bending portion 1202b'' extending from the first electrode bending portion and bending in the direction of the substrate based on the first electrode bending portion, and a third electrode bending portion 1202c'' extending from the second electrode bending portion and bending in the direction of the substrate based on the second electrode bending portion. In this case, the second electrode bending portion 1202b'' can be inserted into the recessed portion 220a''. Therefore, since the electrode bending portion forming the electrode tab is inserted into the recessed portion, the electrode bending portion is fixed by the recessed portion to prevent the electrode tab from flowing in the Y-axis direction and to fix the electrode tab on the substrate.

[0148] According to this embodiment, the substrate connector 220'' can be inserted into the recessed portion 220a''. For example, the first substrate connector 221'' can be inserted into the first recessed portion 221a''. Furthermore, the second substrate connector 222'' can be inserted into the second recessed portion 222a''. More specifically, each of the first substrate connector 221'' and the second substrate connector 222'' of the substrate connector 220'' may include a substrate connecting portion 221'' and a substrate bending portion 222'', and the substrate bending portion 222'' can be inserted into the recessed portion 222a''. Therefore, since the substrate bending portion forming the substrate connector is inserted into the recessed portion, the substrate bending portion is fixed by the recessed portion to prevent the substrate connector from flowing in the Y-axis direction and to fix the substrate connector onto the substrate.

[0149] refer to Figure 13 and Figure 14 According to this embodiment, the substrate 210 of the battery pack 10''' supports other components of the protection circuit module 200''' (e.g., substrate tabs 220''', etc.) and may include circuit patterns and components. The substrate 210''' can be a printed circuit board (PCB) or a flexible PCB (FPCB) and can be arranged on the battery cell. For example, as Figure 13 As shown, substrate 210''' can be located between the fourth strip TP4''' and substrate connector 220'''.

[0150] At least one substrate terminal block 220''' may be located on substrate 210''' and connected to electrode terminal block 120'''. At least one substrate terminal block 220''' includes a conductor that can be electrically connected to electrode terminal block 120''', and may include, for example, nickel, copper, aluminum, etc.

[0151] For example, the number of substrate terminals 220''' can be the same as the number of electrode terminals 120'''. The substrate terminals 220''' can be located at positions corresponding to the electrode terminals 120''', and can be connected to the electrode terminals 120''' by soldering or the like, so as to electrically connect the battery cell 100''' to the protection circuit module 200'''.

[0152] The substrate connector 220''' may include multiple bent portions. For example, the substrate connector 220''' may include a substrate connection portion 2201''' and a substrate bent portion 2202'''. For example, as Figure 13 As shown, the substrate connection portion 2201''' is located on the top surface of the substrate 210''', and can be in the width direction of the substrate 210''' (or the thickness direction of the battery cell or Figure 13 The substrate connection portion 2201''' can extend in the direction of the substrate 210''' while bending based on the direction of the substrate bending portion 2202'''.

[0153] The substrate bending portion 2202''' is bent at the end of the substrate connecting portion 2201''', and can extend in a direction different from the direction of the substrate connecting portion 2201'''. For example, the substrate bending portion 2202''' can be in the height direction of the battery cell (e.g., Figure 13 The substrate bending portion 2202''' can bend and extend in the direction of the substrate 210''' based on the direction of extension of the substrate connecting portion 2201'''.

[0154] The substrate bending portion 2202''' can be arranged between the second electrode bending portion 1202b''' and the substrate 210'''. The substrate terminal block 220''' can contact the second electrode bending portion 1202b''' and the substrate 210'''.

[0155] The substrate connector 220''' can contact the substrate 210'''. The substrate connection portion 2201''' of the substrate connector 220''' can contact the bottom surface portion of the center portion of the first TP1'''.

[0156] The substrate bending portion 2202''' of the substrate terminal piece 220''' can extend in a direction parallel to the second electrode bending portion 1202b''' of the electrode bending portion 1202''', and the substrate bending portion 2202''' can contact the second electrode bending portion 1202b'''. The substrate bending portion 2202''' can be held spaced apart from the side surface portion of the substrate 210'''.

[0157] As described above, according to this embodiment, the substrate terminal block 220''' is arranged between the electrode bending portion 1202''' and the substrate 210''' to contact each of the first strip TP1''' and the substrate 210''', thereby reducing the impact of the electrode bending portion 1202'''' on the substrate. Figure 13 The thickness T''' of the electrode terminals and protection circuit module is reduced. Therefore, the volume occupied by the electrode terminals and protection circuit module of the entire battery pack can be reduced, thereby reducing the overall length and size of the battery pack. At the same time, the volume of the electrode assembly can be increased relative to the same size, thereby increasing the capacity of the battery pack.

[0158] The substrate connector 220''' includes a substrate connection portion 2201''' connected to the substrate 210' and a substrate bending portion 2202''' extending from the substrate connection portion 2201''' and bending in the direction of the substrate based on the substrate connection portion 2201'''.

[0159] Here, the electrode bending portion 1202''' may include a first electrode bending portion 1202a''' extending from the electrode sealing portion 1201''', and a second electrode bending portion 1202b''' extending from the first electrode bending portion 1202a''' and bending in the direction of the substrate 210''' based on the first electrode bending portion 1202a'''.

[0160] The third strip TP3''' can be disposed between the curved electrode sealing portion 1201''' and the housing 140'''. The third strip TP3''' can remain adhered to the electrode sealing portion 1201''' and the housing 140'''.

[0161] The fourth strip TP4''' can be disposed between the curved electrode sealing portion 1201''' and the substrate 210'''. The fourth strip TP4''' can remain adhered to the electrode sealing portion 1201''' and the substrate 210'''.

[0162] An insulating strip 130 may be arranged to surround the electrode bend 1202''' and contact the electrode sealing portion 1201'''. Therefore, the electrode bend 1202''' extending from the electrode sealing portion 1201''' does not contact the substrate 210''' or the housing 140''', to prevent the electrode bend 1202''' from being electrically connected to the electrode assembly 110''' housed in the housing 140'''.

[0163] According to this embodiment, a first strip TP1 may be included, covering the housing 140''' and the protection circuit module 200'''. In this case, the thickness T1''' of the first strip TP1''' can be greater than the thickness T3''' of the fourth strip TP4'''. The first strip TP1''' is formed to cover the electrode contact 120''' and the protection circuit module 200''', and can protect the electrode contact 120''' and the protection circuit module 200''' from external impacts. Therefore, the thickness of the first strip TP1''' can be greater than the thickness of the fourth strip TP4''', which is placed between the substrate 210''' and the electrode sealing portion 1201''' to insulate the two components of the substrate 210''' and the electrode sealing portion 1201'''.

[0164] According to this embodiment, the thickness T2''' of the substrate 210''' and the substrate terminal piece 220''' can be minimized. That is, each of the substrate 210''' and the substrate terminal piece 220''' is formed as a single layer, and the single-layer substrate 210''' and the single-layer substrate terminal piece 220''' are stacked on top of each other to form a layered structure, and the thickness T2''' formed by the substrate 210''' and the substrate terminal piece 220''' can be minimized. Therefore, the thickness T''' occupied by the electrode terminal piece and the protection circuit module can be further reduced, thereby contributing to the compactness and capacity improvement of the battery pack.

[0165] Specifically, single-layer substrate terminals 220''' are stacked and arranged between substrate 210''' and first strip TP1'''.

[0166] Furthermore, the substrate connection piece 220''' has a substrate connection portion 2201''' with a width LW3''' greater than the height LH3''' of the substrate bending portion 2202''', which minimizes the height LH3''' of the substrate connection piece 220'''. The substrate bending portion 2202''' bends towards the side surface portion of the substrate 210''', causing the height of the substrate bending portion 2202''' to be absorbed by the side surface portion of the substrate 210''', thereby minimizing the height ratio of the substrate connection piece 220''' to the entire battery cell. Additionally, the thickness T''' occupied by the electrode connection piece and the protection circuit module can be further reduced, contributing to the compactness and increased capacity of the battery pack.

[0167] The top portion of the second electrode bending portion 1202b''' can contact the bottom surface portion of the center portion of the first electrode TP1'''. Therefore, the height LH1''' of the electrode tab 120''' is minimized to further reduce the thickness T''' occupied by the electrode tab and the protection circuit module, thereby contributing to the compactness and capacity improvement of the battery pack.

[0168] Furthermore, the width LW2''' of substrate 210''' can be greater than the height LH2''' of substrate 210'''. Therefore, the thickness T''' occupied by the electrode terminals and protection circuit module can be further reduced, thereby contributing to the compactness and capacity improvement of the battery pack.

[0169] Furthermore, the width LW3''' of the substrate terminal piece 220''' can be greater than the height LH3''' of the substrate terminal piece 220'''. Therefore, the thickness T''' occupied by the electrode terminal piece and the protection circuit module can be further reduced, thereby contributing to the compactness and capacity improvement of the battery pack.

[0170] The height LH4''' of the electrode sealing portion 1201''' can be less than the width LW4''' of the electrode sealing portion 1201'''. Furthermore, the width LW2''' of the substrate 210''' can be greater than the width LW4''' of the electrode sealing portion 1201'''. Therefore, the substrate 210''' can... Figure 13 The electrode sealing portion 1201''' is completely covered in the first direction D1''' of the X-axis direction, thereby preventing the electrode sealing portion 1201''' from contacting and electrically connecting with the substrate terminal piece 220'''. In addition, the substrate 210''' acts to press the bent electrode sealing portion 1201''' in the direction where the housing 140''' is located, so the electrode sealing portion 1201''' can have a completely fixed structure in a bent state between the substrate 210''' and the housing 140'''.

[0171] refer to Figure 15 The second electrode bending portion 1202b''' and the substrate bending portion 2202''' in contact with it can contact the side surface portion of the substrate 210'''. Thus, the side surface portion of the substrate bending portion 2202''' is arranged to contact the side surface portion of the substrate 210''' to prevent the substrate connector 220''' from contacting the substrate connector 220''' and to fix the substrate connector 220''' onto the substrate 210'''.

[0172] The strip according to the above embodiments can be replaced by an adhesive component such as a membrane component, a sheet component, or an adhesive component with an adhesive applied or having adhesive force.

[0173] Although this disclosure has been described with reference to embodiments shown in the accompanying drawings as described above, these are merely examples. Those skilled in the art will fully understand that various modifications and equivalent embodiments can be made from these embodiments. Therefore, the true scope of protection of this disclosure should be determined based on the appended claims.

Claims

1. A battery pack comprising: a battery cell; and a protection circuit module connected to the battery cell, wherein the battery cell includes: an electrode assembly, and an electrode tab extending from the electrode assembly, the protection circuit module includes a substrate and a substrate tab connected to the substrate, the electrode tab includes an electrode sealing portion extending from a case of the electrode assembly and an electrode bent portion extending from the electrode sealing portion, and the substrate tab is disposed between the electrode bent portion and the substrate and is formed to be in contact with the electrode bent portion and the substrate.

2. The battery pack of claim 1, wherein, The substrate tab includes a substrate connection portion connected to the substrate and a substrate bent portion extending from the substrate connection portion and bent in a direction in which the substrate is located based on the substrate connection portion.

3. The battery pack of claim 2, wherein, The electrode bent portion includes: a first electrode bent portion extending from the electrode sealing portion; a second electrode bent portion extending from the first electrode bent portion and bent in a direction in which the substrate is located based on the first electrode bent portion; and a third electrode bent portion extending from the second electrode bent portion and bent in the direction in which the substrate is located based on the second electrode bent portion.

4. The battery pack of claim 3, wherein, The third electrode bent portion is in contact with the substrate connection portion.

5. The battery pack of claim 3, wherein, The second electrode bent portion is in contact with the substrate bent portion.

6. The battery pack of claim 3, wherein, The third electrode bent portion is disposed between a first tape and the substrate tab.

7. The battery pack of claim 1, wherein, The substrate tab and the third electrode bent portion are stacked in a single layer and disposed between the substrate and the first tape.

8. The battery pack of claim 1, wherein, A third tape is disposed between the bent electrode sealing portion and the electrode assembly.

9. The battery pack of claim 1, wherein, A fourth tape is disposed between the bent electrode sealing portion and the substrate.

10. The battery pack of claim 1, wherein, An insulation tape is disposed between the electrode sealing portion and the electrode bent portion. 11.The battery pack of claim 1, further comprising a first tape covering the electrode assembly and the protection circuit module.

12. The battery pack of claim 11, wherein, A thickness T1' of the first tape is greater than a thickness T4' of a fourth tape.

13. The battery pack of claim 1, wherein, A width LW3' of the substrate tab is greater than a height LH3' of the substrate tab.

14. The battery pack of claim 1, wherein, A width LW2' of the substrate is greater than a height LH3' of the substrate.

15. The battery pack of claim 1, wherein, The substrate has a recessed portion into which a portion of the electrode tab is inserted.

16. The battery pack of claim 15, wherein, The electrode bent portion of the electrode tab includes: a first electrode bent portion extending from the electrode sealing portion; a second electrode bent portion extending from the first electrode bent portion and bent in a direction in which the substrate is located with respect to the first electrode bent portion; and a third electrode bent portion extending from the second electrode bent portion and bent in the direction in which the substrate is located with respect to the second electrode bent portion, wherein the second electrode bent portion is inserted into the recessed portion.

17. The battery pack of claim 15, wherein, The substrate tab is inserted into the recessed portion.

18. The battery pack of claim 17, wherein, The substrate tab includes: a substrate connection portion connected to the substrate; and a substrate bent portion extending from the substrate connection portion and bent in a direction in which the substrate is located based on the substrate connection portion, and The substrate bending portion is inserted into the recessed portion.

19. The battery pack of claim 15, wherein, The substrate includes a printed circuit board (PCB) portion and a molded portion covering an upper side of the PCB portion.

20. The battery pack of claim 19, wherein, The recessed portion is formed by recessing side surfaces of the PCB portion and the molded portion of the substrate in an inner direction of the substrate.

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