Electrode assembly, battery cell, and battery pack and vehicle including the same

Abstract

The present invention relates to an electrode assembly, a battery cell, and a battery pack and a vehicle including the same, in which the electrode assembly is designed to prevent damage to components by inducing sliding. Specifically, the present invention provides an electrode assembly, a battery cell, and a battery pack and a vehicle including the same, in which the electrode assembly is characterized by a stacked structure including a first electrode, a second electrode, and a separator between the first electrode and the second electrode, the stacked structure is wound around a winding axis and defines a core and an outer circumferential surface, and the second electrode includes a sliding portion that surrounds one end in a winding direction and extends outward a certain distance toward the core in the winding direction.

Description

Technical Field

[0001] This disclosure relates to electrode assemblies, battery cells, and battery packs and vehicles including the battery cells, and more specifically, to electrode assemblies and battery cells designed to prevent component damage due to slip sensing, and battery packs and vehicles including the battery cells.

[0002] This application is based on and claims priority to Korean Patent Application No. 10-2025-0018320 filed with the Korean Intellectual Property Office on February 12, 2025, the entire disclosure of which is incorporated herein by reference. Background Technology

[0003] Secondary batteries are widely used not only in portable devices but also in electric vehicles (EVs) or hybrid electric vehicles (HEVs) powered by electric power sources. These batteries are highly versatile in terms of product variety and possess electrical characteristics such as high energy density. Such secondary batteries are gaining attention as a new energy source for enhancing environmental sustainability and energy efficiency, not only because of their major advantage of significantly reducing fossil fuel use but also because they do not produce byproducts from energy use.

[0004] Currently widely used rechargeable batteries include lithium-ion batteries, lithium polymer batteries, nickel-cadmium batteries, nickel-metal hydride batteries, and nickel-zinc batteries. The operating voltage of a single rechargeable battery cell (i.e., a single battery cell) is approximately 2.5 V to 4.5 V. Therefore, when a higher output voltage is required, multiple battery cells can be connected in series to configure a battery pack. Furthermore, depending on the required charge / discharge capacity of the battery pack, multiple battery cells can be connected in parallel to configure the battery pack. Therefore, the number of battery cells included in a battery pack can be set in various ways according to the required output voltage or charge / discharge capacity.

[0005] Meanwhile, the electrode expansion stress generated during charging and discharging in the activation process of cylindrical battery cells can increase the pattern length of the electrodes, which can cause the electrodes to slide on the core side of the electrode assembly wound in a core shape. In particular, the high friction between the negative electrode and the separator hinders smooth sliding during electrode expansion. As a result, the accumulated stress may deform the negative electrode (e.g., by bending it), potentially causing shocks near the core.

[0006] That is, this could potentially damage the separator near the core, and such damage could lead to an electrical short circuit within the core. Such a short circuit can significantly reduce battery safety and create a risk of serious safety problems, such as explosions or fires.

[0007] Therefore, it is necessary to develop a new electrode assembly design that can effectively improve the sliding performance during the electrode expansion process. Summary of the Invention

[0008] Technical issues

[0009] This disclosure is designed to address problems in the related art, and therefore aims to provide an electrode assembly and a battery cell capable of causing smooth sliding by reducing the coefficient of friction between components, as well as a battery pack and a vehicle including the battery cell.

[0010] Furthermore, in one aspect, this disclosure relates to providing an electrode assembly and a battery cell capable of promoting sliding between an electrode and a separator for thermal expansion, as well as a battery pack and a vehicle including the battery cell.

[0011] In addition, in one aspect, this disclosure relates to providing electrode assemblies and battery cells capable of preventing damage to the separator by reducing stress, as well as battery packs and vehicles including the battery cells.

[0012] However, the technical problems sought to be solved by this disclosure are not limited to those described above, and those skilled in the art will clearly understand from the following description of the invention that are not mentioned above.

[0013] Technical solution

[0014] To address the aforementioned problems, this disclosure provides an electrode assembly formed and defining a core and an outer peripheral surface by winding a laminate around a winding axis. The laminate includes a first electrode, a second electrode, and a diaphragm inserted between the first electrode and the second electrode. The second electrode has a sliding portion configured to surround one end of the second electrode in the winding direction and extend a predetermined length outward toward the core in the winding direction.

[0015] For example, the coefficient of friction between the second electrode and the diaphragm can be greater than the coefficient of friction between the sliding part and the diaphragm.

[0016] For example, the end of the second electrode in the winding direction may be closer to the core than the end of the first electrode in the winding direction.

[0017] For example, the diaphragms may be multiple, and the second electrode may include: a first surface, at least a portion of which is coated with an active material layer; and a second surface, located opposite the first surface, at least a portion of which is coated with an active material layer. Furthermore, the multiple diaphragms may include: a first diaphragm arranged facing the first surface; and a second diaphragm arranged facing the second surface.

[0018] For example, the sliding portion can be attached to the first surface and the second surface along a predetermined interval in the winding direction, and extend to the outside of the winding direction while surrounding the second electrode at one end in the winding direction and overlapping with each other.

[0019] For example, at least one of the first diaphragm and the second diaphragm can slide toward the outside of the winding direction while in contact with the first surface or the second surface.

[0020] For example, the diaphragms may be provided in multiple forms, and when the second electrode expands, at least one of the multiple diaphragms may slide at one end of the second electrode in the winding direction.

[0021] For example, at least one of the plurality of diaphragms can slide while contacting the sliding portion extending from one end of the second electrode in the winding direction to the outside of the winding direction.

[0022] For example, in a cross-section perpendicular to the winding direction, the sliding portion can be formed to have a thickness smaller than that of the second electrode.

[0023] For example, the sliding portion can be configured as an adhesive film.

[0024] In addition, this disclosure provides a battery cell including an electrode assembly of this disclosure and a battery can configured to house the electrode assembly.

[0025] Furthermore, this disclosure may provide a battery pack including battery cells according to this disclosure.

[0026] Furthermore, this disclosure may provide a vehicle that includes a battery pack according to this disclosure.

[0027] Beneficial effects

[0028] Electrode assemblies and battery cells according to various embodiments of this disclosure, as well as battery packs and vehicles including the battery cells, have the effect of causing smooth sliding by reducing the coefficient of friction between components.

[0029] Furthermore, in one aspect, the electrode assembly and battery cell according to various embodiments of the present disclosure, as well as the battery pack and vehicle including the battery cell, have the effect of promoting sliding between the thermally expanding electrodes and the separator.

[0030] Furthermore, in one aspect, the electrode assembly and battery cell according to various embodiments of the present disclosure, as well as the battery pack and vehicle including the battery cell, have the effect of preventing damage to the separator by reducing stress.

[0031] However, the effects that can be obtained from this disclosure are not limited to those described above, and those skilled in the art will clearly understand from the following description of the invention that are not mentioned above. Attached Figure Description

[0032] Figure 1 This is a schematic view of the electrode assembly before winding, according to an embodiment of the present disclosure.

[0033] Figure 2 It is shown schematically. Figure 1 The electrode assembly is shown in a view after winding.

[0034] Figure 3 It is shown Figure 2 A view showing the arrangement of the first electrode, the second electrode, and multiple diaphragms in the electrode assembly.

[0035] Figure 4 and Figure 5 It shows the connection to Figure 1 A view of the sliding portion of the second electrode of the electrode assembly.

[0036] Figure 6 It is shown in Figure 1 A view of the sliding diaphragm in the electrode assembly.

[0037] Figure 7 This is a schematic view of a battery cell according to an embodiment of the present disclosure.

[0038] Figure 8 yes Figure 7 A side cross-sectional view of the battery cell in the diagram.

[0039] Figure 9 This is a schematic view of a battery pack including the battery cells of this disclosure.

[0040] Figure 10 This is a schematic view of a vehicle that includes the battery pack disclosed herein. Detailed Implementation

[0041] Preferred embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. Before the description, it should be understood that the terminology used in the specification and appended claims should not be construed as limited to its general and dictionary meaning, but rather is interpreted based on the principle of allowing the inventors to appropriately define the terminology for the best interpretation, and on the meaning and concepts corresponding to the technical aspects of the present disclosure.

[0042] Therefore, the description presented herein is merely a preferred example for illustrative purposes and does not represent the full scope of this disclosure. It should be understood that other equivalents and modifications may be made thereto without departing from the scope of this disclosure.

[0043] Furthermore, this disclosure may include various embodiments. Additionally, in each embodiment, repeated descriptions of substantially the same or similar structures are omitted, and descriptions are based on their differences.

[0044] Furthermore, for a better understanding of this disclosure, the drawings are not necessarily drawn to scale, and for clarity, the dimensions of some elements may be enlarged. Additionally, the same reference numerals may denote the same elements in different embodiments.

[0045] Throughout this specification, unless otherwise stated, each element may include one or more elements.

[0046] Furthermore, the statement "one element is 'connected,' 'joined,' or 'joined' to another element" should be understood as meaning that the two elements can be directly connected or joined to each other, and that another element can be "inserted" between the two elements, or that the two elements can be "connected," "joined," or "joined" via another element.

[0047] The singular expressions used herein are intended to include plural expressions unless the context clearly indicates otherwise. In this application, terms such as “comprise” or “include” should not be construed as necessarily including all the various components or steps described in the specification, and some components or steps may be omitted, or additional components or steps may be included.

[0048] Throughout this specification, unless otherwise stated, the expression "A and / or B" may refer to A, B, or both A and B.

[0049] At the same time, although terms such as up, down, left, right, front, and back are used in this specification to indicate directions, it will be apparent to those skilled in the art to which this disclosure pertains that these terms are merely for the purpose of explanation with reference to the accompanying drawings and may vary depending on the position of the target object, its arrangement or rotation, or the position of the observer.

[0050] This disclosure can be configured such that the following embodiments can be implemented independently. Furthermore, this disclosure can be implemented by combining two or more of the following embodiments. Each of the following embodiments can be implemented independently and can also be freely linked together.

[0051] For ease of explanation, in this specification, the length direction of the winding axis of the electrode assembly wound in the form of a core will be referred to as the winding axis direction (Z). Furthermore, the direction around the winding axis will be referred to as the circumferential direction, and the direction in which the electrode assembly is wound around the winding axis will be referred to as the winding direction (X). Additionally, the direction approaching or away from the winding axis will be referred to as the radial direction.

[0052] First, the electrode assembly 20 of the present invention will be described schematically.

[0053] Figure 1 This is a schematic view of the electrode assembly 20 before winding, according to an embodiment of the present disclosure, and Figure 2 It is shown schematically. Figure 1 The electrode assembly 20 is shown after winding.

[0054] Reference Figure 1 and Figure 2 The electrode assembly 20 can be configured such that a laminate including a first electrode 21, a second electrode 22 and a diaphragm 28 inserted between the first electrode 21 and the second electrode 22 is wound around a winding axis.

[0055] After winding is completed, the electrode assembly 20 can be in the form of a core. When viewed from the top or bottom of the electrode assembly 20 in the XY plane, the external shape of the electrode assembly 20 in the circumferential direction is circular. The structure of the electrode assembly 20 is not limited to this embodiment and can have a winding structure known in the art.

[0056] The core-type electrode assembly 20 may be defined by a core 201 at its center along the winding axis and an outer peripheral surface 202 on the circumference along the winding axis. In this case, the direction approaching the core 201 in the core-type electrode assembly 20 will be referred to as the core direction.

[0057] The first electrode 21, the second electrode 22, and the diaphragm 28 can each be formed to have a predetermined width along the winding axis direction (Z) and extend a predetermined length along the winding direction (X). In this case, in the sheet member extending a predetermined length along the winding direction (X), the direction approaching the core 201 when winding will be referred to as the core direction.

[0058] The first electrode 21 can be a positive electrode plate, while the second electrode 22 can be a negative electrode plate, and vice versa.

[0059] The first electrode 21 and the second electrode 22 can be manufactured in the form of a sheet. The first electrode 21 and the second electrode 22 can be configured such that an active material layer is applied to at least a portion of the surface of the metal foil 23. The first electrode 21 and the second electrode 22 can have a coated portion 24 and an uncoated portion 26, wherein the active material layer is coated on the coated portion 24 and the uncoated portion 26 is not coated with an active material layer.

[0060] The uncoated portion 26 can be exposed to the outside of the separator 28 while forming multiple winding turns around the winding axis of the electrode assembly 20, and can serve as the electrode tab itself. That is, the positive electrode plate and the negative electrode plate can each include an uncoated portion 26 at the long side end in the winding axis direction (Z) where no active material is coated. In addition, the uncoated portions 26 of the first electrode 21 and the second electrode 22 can be configured to face opposite directions in the winding axis direction (Z). The first electrode 21 and the second electrode 22 can be housed within the battery canister 10 such that the uncoated portion 26 of the first electrode 21 is located at one end in the winding axis direction (Z), and the uncoated portion 26 of the second electrode 22 is located at the other end in the winding axis direction (Z). Here, any active material known in the art can be used as the positive electrode active material coated on the positive electrode plate and the negative electrode active material coated on the negative electrode plate, without limitation.

[0061] Furthermore, the membrane can be configured as a single-layer or multi-layer porous polymer membrane made of polymers such as polyolefins (e.g., ethylene homopolymer, propylene homopolymer, ethylene / butene copolymer, ethylene / hexene copolymer, or ethylene / methacrylate copolymer). As another example, the membrane can be a conventional porous nonwoven fabric, such as a nonwoven fabric made of high-melting-point glass fiber or polyethylene terephthalate fiber.

[0062] At least one surface of the diaphragm 28 may include a coating of inorganic particles. Furthermore, the diaphragm itself may be formed from a coating of inorganic particles. The particles constituting the coating may have a structure in which they are bonded to a binder, resulting in interstitial volumes between adjacent particles.

[0063] The uncoated portion 26 itself can be used as an electrode tab.

[0064] The uncoated portion 26 can form a plurality of flag-shaped notched tabs 27 by forming notches at predetermined intervals along the winding direction (X). The plurality of notched tabs 27 can have an isosceles trapezoidal shape arranged along the winding direction (X). However, it is not limited to this and can be various shapes, such as semicircles, semi-ovals, triangles, rectangles and parallelograms.

[0065] Additionally, the multiple notched tabs 27 can be configured to have the same width along the winding direction (X). However, the width of the multiple notched tabs 27 can gradually or progressively widen along the winding direction (X) from the core side where the winding of the electrode assembly 20 begins to the outermost point after winding.

[0066] In addition, the height of the multiple notched tabs 27 can gradually increase from the core side to the outside along the winding axis direction (Z). However, the height of the multiple notched tabs 27 can be constant or gradually decrease.

[0067] Furthermore, the multiple notched tabs 27 can be bent in the radial direction and flattened within the electrode assembly 20. Additionally, the notched tabs 27 can be bent radially inward or outward within the electrode assembly 20.

[0068] Furthermore, during the formation of the rolled-core electrode assembly 20, the multiple notched tabs 27 can be bent one after another. Alternatively, after the rolled-core electrode assembly 20 is formed, all the notched tabs 27 can be bent at once.

[0069] As described above, the notched tabs 27 of the radially bent and stacked first electrode 21 and the notched tabs 27 of the second electrode 22 can provide planes that are substantially perpendicular to the axial direction at the two axial ends of the electrode assembly 20, respectively.

[0070] Figure 3 It is shown Figure 2 A view showing the arrangement of the first electrode 21, the second electrode 22, and the plurality of diaphragms 28 in the electrode assembly. Figure 4 and 5 It shows the connection to Figure 1 A view of the sliding portion 100 of the second electrode 21 of the electrode assembly 20, and Figure 6 It is shown in Figure 1 A view of the sliding diaphragm 28 in the electrode assembly 20.

[0071] See Figures 3 to 6 The second electrode 22 in this embodiment may include a sliding portion 100.

[0072] The sliding portion 100 can be configured to extend outward (+X) a predetermined length around one end E1 in the winding direction (X) toward the core 201. For example, the sliding portion 100 can be attached to overlap the core-direction end of the second electrode 22. This structure is designed to form a new interface at the portion where the separator 28 begins to slide, in order to mitigate the stress accumulated due to electrode expansion during charging / discharging. This not only improves stability due to electrode expansion but also enhances battery performance and reliability.

[0073] As an example, the electrode assembly 20 of this disclosure can be configured such that the coefficient of friction between the sliding portion 100 and the diaphragm 28 is set to be less than the coefficient of friction between the second electrode 22 and the diaphragm 28. This configuration can facilitate smooth sliding between the diaphragm 28 and the sliding portion 100 and effectively prevent internal impact on the core 201 side due to excessive bending or deformation caused by stress accumulated in the second electrode 22 during winding.

[0074] Therefore, the electrode assembly 20 of this embodiment can help improve the reliability and service life of the secondary battery by not only enhancing the structural stability of each component but also reducing physical damage that may occur during charging / discharging.

[0075] As an example, the electrode assembly 20 can be configured in the form of a core, and one end E1 of the second electrode 22 in the winding direction (X) can be arranged closer to the core 201 than one end E2 of the first electrode 21 in the winding direction (X). In this case, the second electrode 22 can be the negative electrode, while the first electrode 21 can be the positive electrode, and vice versa.

[0076] The electrode assembly 20 of this embodiment can be designed such that, based on electrode expansion that occurs during charging / discharging, it can more effectively slide at one end E1 of the second electrode 22 located closer to the core 201 in the winding direction (X). For this purpose, a sliding portion 100 can be provided at the end of the second electrode 22 in the winding direction (X). This can help improve the performance and durability of the secondary battery by reducing stress caused by electrode expansion and improving the structural stability of the electrode assembly 20.

[0077] As an example, multiple diaphragms 28 may be provided in the electrode assembly 20.

[0078] Additionally, the second electrode 22 may include a first surface 221 and a second surface 222, the first surface 221 having an active material layer 24 coated on at least a portion of the structure, and the second surface 222 being located on the opposite side of the first surface 221 and having the same active material layer 24 coated on at least a portion thereof.

[0079] In the winding axis direction (Z), the first surface 221 and the second surface 222 may each have a coated portion 25 coated with the active material layer 24 and an uncoated portion 26 uncoated with the active material layer 24.

[0080] Multiple diaphragms 28 can be arranged to face the two surfaces of the second electrode 22, respectively. Specifically, the multiple diaphragms 28 may include a first diaphragm arranged to contact the first surface 221 and a second diaphragm arranged to contact the second surface 222. Therefore, the internal stability of the electrode assembly 20 can be improved, and electrical short circuits or deformation that may occur during the charging / discharging process can be effectively prevented.

[0081] The sliding portion 100 can be configured to be attached to a predetermined section d1 on the first surface 221 and the second surface 222 of the second electrode 22 in the winding direction (X). Specifically, the sliding portion 100 can surround one end E1 of the second electrode 22 in the winding direction (X) and extend outward (+X) along the predetermined section d2, and be attached to the contact surfaces of the first surface 221 and the second surface 222, converging and overlapping each other. Therefore, the sliding portion 100 can be more stably fixed to the second electrode 22.

[0082] The aforementioned configuration of the sliding portion 100 can form a sliding structure extending from one end E1 of the second electrode 22 in the winding direction (X) to the outer side (+X) in the winding direction. This can effectively absorb and reduce the stress caused by electrode expansion during charging / discharging, thereby improving the winding stability of the electrode assembly 20.

[0083] Furthermore, this sliding structure helps improve the stability and reliability of battery performance by buffering the electrical and mechanical loads generated during electrode expansion, while maintaining the consistency of the electrode structure even during long-term use.

[0084] As an example, at least one of the plurality of diaphragms 28 can be configured to slide toward the core 201 outward in the winding direction (+X) while contacting the first surface 221 or the second surface 222. This can be achieved by providing a sliding portion 100 at the location where the sliding begins, for example, in a specific region near the core 201-side end of the second electrode 22, to form a new interface. Specifically, at least one of the plurality of diaphragms 28 can contact the sliding portion 100 extending from one end E1 of the second electrode 22 in the winding direction (X) outward in the winding direction (+X), thereby causing smooth sliding.

[0085] This structure effectively reduces the frictional force generated at the interface between the second electrode 22 and the diaphragm 28 during electrode expansion, thereby allowing sliding caused by electrode expansion to occur naturally. As a result, the occurrence of smooth sliding can prevent core impact and improve the structural stability of the electrode assembly 20.

[0086] As an example, in a cross-section (XY plane) perpendicular to the winding direction (X), the sliding portion 100 can be formed with a thickness less than that of the second electrode 22. When the sliding portion 100 extends from one end E1 of the second electrode 22 in the winding direction (X) to the outside (+X) of the winding direction with a thickness less than that of the second electrode 22, this structure helps to reduce the pressure applied to the cross-sectional area of ​​the sliding portion 100, thereby facilitating sliding.

[0087] The sliding portion 100 can be provided in the form of an adhesive film, and this adhesive film can have the property of providing sufficient adhesion while reducing the friction between the sliding portion 100 and the diaphragm 28. For example, the adhesive film can be made of a material with a low coefficient of friction, or the coefficient of friction can be optimized by surface treatment techniques. Thus, the sliding portion 100 can create an environment in which sliding can proceed smoothly while effectively absorbing the stress generated during electrode expansion.

[0088] For example, the sliding part 100 can be made of a polymer-based polymer material or a coating material with low friction properties. Such materials have excellent mechanical strength and thermal stability, and can maintain their function without deformation or deterioration during charging / discharging, thereby contributing to improved durability and performance reliability of the secondary battery.

[0089] Therefore, by appropriately designing the thickness, material properties, and structural characteristics of the sliding part 100, the electrode assembly 20 of this embodiment can ensure the stability and long-term performance of the electrode assembly 20, thereby contributing to smooth sliding during electrode expansion.

[0090] Figure 7 This is a schematic view of a battery cell 1 according to an embodiment of the present disclosure, and Figure 8 yes Figure 7 A side cross-sectional view of battery cell 1 in the diagram.

[0091] See Figures 1 to 6 The electrode assembly 20 described above can be included as a component of the battery cell 1. Here, the electrode assembly 20 as a component of the battery cell 1 can be applied in the same manner. Figures 1 to 6 The description in the text is as described above, and any unnecessary descriptions will be omitted below.

[0092] Reference Figure 7 and Figure 8 According to this embodiment, the battery cell 1 may mainly include a battery tank 10 and an electrode assembly 20.

[0093] In this embodiment, the battery cell 1 can be a cylindrical battery cell. For example, the battery cell 1 can be a cylindrical battery cell where the shape factor ratio (defined as the ratio of the diameter to the height of the cylindrical battery cell, i.e., the diameter to the height ratio) is approximately greater than 0.4.

[0094] Here, the form factor can refer to the values ​​representing the diameter and height of a cylindrical battery cell. By applying the numerical value representing the form factor, a cylindrical battery cell can be a 46110 cell, a 48750 cell, a 48110 cell, a 48800 cell, or a 46800 cell. Here, the first two numbers represent the diameter of the cell, the last two numbers represent the height of the cell, and the last number 0 indicates that the cross-section of the cell is circular.

[0095] Alternatively, the battery cell 1 can be, for example, a cylindrical battery cell with a shape factor ratio (the ratio of its radial diameter to its height in the winding axis direction) approximately greater than 0.4. For example, the diameter of the battery cell 1 can be 40 mm to 50 mm, and the height can be 60 mm to 130 mm. The shape factor of the battery cell 1 can be, for example, 46110, 4875, 48110, 4880, or 4680.

[0096] However, the shape of the battery cell 1 according to this disclosure is not limited to the example described above, and can be applied to batteries of other shapes. For example, it can be applied to prismatic batteries.

[0097] The battery canister 10 can be a cylindrical structure for cylindrical battery cells. In this case, the sidewall 11 can form the side surface of the cylinder of the battery canister 10, and the bottom member 12 can be attached to the sidewall 11 to form one end of the cylinder. That is, the bottom member 12 can be the closed part of the battery canister 10, and the other end of the battery canister 10 opposite to the bottom member 12 can be open to form an opening.

[0098] The bottom member 12 can be configured as a disk shape with a through hole formed at the center, and the sidewall 11 can have a cylindrical shape surrounding the bottom member 12 and having a constant radius along the circumferential direction. The battery canister 10 including the bottom member 12 and the sidewall 11 can be a component formed by deep drawing a nickel-plated metal sheet on the surface of steel. Furthermore, the materials of the bottom member 12 and the sidewall 11 are not limited to these.

[0099] The battery cell 1 can be connected to the battery canister 10 through the opening, as described above. Figures 1 to 6 The electrode assembly 20 described in this disclosure is housed within the battery canister 10.

[0100] Therefore, the battery cell 1 of this embodiment helps reduce physical damage to the electrode assembly 20 by minimizing stress concentration caused by repeated charging and discharging of the battery cell 1, and also helps increase the long-term durability and performance reliability of the battery cell 1. Thus, the battery cell 1 of this embodiment can be applied to secondary battery designs that meet high power and high density requirements.

[0101] Figure 9 This is a schematic view illustrating a battery pack P including battery cell 1 according to an embodiment of the present disclosure, and Figure 10 This is a schematic view of a vehicle V including a battery pack P according to an embodiment of the present disclosure.

[0102] refer to Figure 9 The battery pack P according to embodiments of the present disclosure may include a battery pack housing C configured to house battery cells 1, and may further include various other components of a battery pack known at the time of filing of this disclosure. For example, the battery pack P according to embodiments of the present disclosure may also include components such as a current sensor, a fuse, and a service plug.

[0103] Additionally, see Figure 10 The vehicle V according to embodiments of the present disclosure may include one or more battery packs P according to the present disclosure. Furthermore, the vehicle V according to embodiments of the present disclosure may include various other components included in the vehicle V in addition to the battery packs P. For example, in addition to the battery packs P according to embodiments of the present disclosure, the vehicle V according to embodiments of the present disclosure may also include a chassis, an electric motor, and control devices such as an ECU (electronic control unit).

[0104] Furthermore, the battery pack P according to the embodiments of this disclosure can be applied to various types of energy storage devices or power sources, and can be installed in other devices, mechanisms and facilities besides the vehicle V, such as energy storage systems using secondary batteries.

[0105] As described above, although this disclosure has been described with reference to limited embodiments and drawings, this disclosure is not limited thereto, and various modifications and variations are possible without departing from the technical spirit of this disclosure and the equivalent scope of the claims described below by those skilled in the art to which this disclosure pertains.

[0106] [Description of reference numerals in the attached figures]

[0107] 1: Battery cells

[0108] 10: Battery can

[0109] 11: Sidewall

[0110] 12: Bottom components

[0111] 20: Electrode assembly

[0112] 201: core

[0113] 202: Peripheral surface

[0114] 21: First electrode

[0115] 22: Second electrode

[0116] 221: First Surface

[0117] 222: Second Surface

[0118] 23: Metal foil

[0119] 24: Active material layer

[0120] 25: Coating section

[0121] 26: Uncoated area

[0122] 27: Electrode tabs

[0123] 28: Diaphragm

[0124] 100: Sliding part

[0125] E1: Second electrode end

[0126] E2: First electrode end

[0127] C: Battery pack casing

[0128] P: Battery pack

[0129] V: Vehicle

Claims

1. An electrode assembly formed and defining a core and an outer peripheral surface by winding a laminate around a winding axis, the laminate including a first electrode, a second electrode, and a diaphragm inserted between the first electrode and the second electrode. in, The second electrode has: A sliding portion is configured to surround one end of the second electrode in the winding direction and extend a predetermined length outward toward the core in the winding direction.

2. The electrode assembly according to claim 1, in, The coefficient of friction between the sliding part and the diaphragm is less than the coefficient of friction between the second electrode and the diaphragm.

3. The electrode assembly according to claim 1, in, The end of the second electrode in the winding direction is positioned closer to the core than the end of the first electrode in the winding direction.

4. The electrode assembly according to claim 1, in, The diaphragms are configured in multiple ways. The second electrode includes: A first surface, at least a portion of which is coated with an active material layer; and A second surface, located opposite the first surface, and at least a portion of the second surface is coated with an active material layer. The plurality of said diaphragms include: A first diaphragm, the first diaphragm being arranged to face the first surface; and A second diaphragm is arranged to face the second surface.

5. The electrode assembly according to claim 4, in, The sliding portion is attached to the first surface and the second surface along a predetermined interval in the winding direction, and the sliding portion extends outward in the winding direction while surrounding the second electrode at one end in the winding direction and overlapping with each other.

6. The electrode assembly according to claim 4, in, At least one of the first diaphragm and the second diaphragm slides toward the core outward in the winding direction while in contact with the first surface or the second surface.

7. The electrode assembly according to claim 1, in, The diaphragms are configured in multiple ways, and When the second electrode expands, at least one of the plurality of diaphragms slides at one end of the second electrode in the winding direction.

8. The electrode assembly according to claim 1, in, At least one of the plurality of diaphragms slides while in contact with the sliding portion extending from one end of the second electrode in the winding direction to the outside of the winding direction.

9. The electrode assembly according to claim 1, in, In a cross section perpendicular to the winding direction, the sliding portion is formed to have a thickness smaller than that of the second electrode.

10. The electrode assembly according to claim 1, in, The sliding part is configured as an adhesive film.

11. A battery cell, the battery cell comprising: The electrode assembly according to any one of claims 1 to 10; as well as A battery canister configured to house the electrode assembly.

12. A battery pack comprising the battery cells according to claim 11.

13. A vehicle comprising at least one battery pack according to claim 12.

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