Electrode, electrode assembly, and battery

Abstract

The present disclosure relates to an electrode comprising: a first coating portion which is formed by coating an active material on a first substrate; and a first electrode terminal portion which is formed by cutting a portion of a first uncoated portion of the first substrate, where the active material is not coated, and the end portion of which has a shape that can be exposed to the outside of the battery or can extend to the outside of the battery.

Description

Electrodes, electrode assemblies and batteries

[0001] The present disclosure relates to electrodes, electrode assemblies, and batteries.

[0002] In general, as the demand for portable electronic products such as laptops, video cameras, and mobile phones rapidly increases and the commercialization of robots, electric vehicles, etc. becomes more widespread, research on battery packs capable of repeated charging and discharging is actively being conducted.

[0003] Typically, when manufacturing batteries, the electrode tabs and current collector are connected, and separate plate-shaped components are welded to the current collector to form an electrical connection to the external terminal. However, these intermediate components increase internal battery resistance during charging and discharging, resulting in reduced rapid charging performance and increased heat generation.

[0004] The above-described information disclosed in the background technology of this invention is only intended to enhance understanding of the background of the present invention, and therefore may include information that does not constitute prior art.

[0005] The purpose of the present invention is to provide an electrode, an electrode assembly, and a battery that can reduce the internal resistance of a battery by improving the structure of an electrical connection between an electrode of a battery and an external terminal, thereby improving the charging performance of the battery.

[0006] However, the technical problems to be solved by the present invention are not limited to the problems described above, and other problems not mentioned can be clearly understood by those skilled in the art from the description of the invention described below.

[0007] According to one embodiment of the present invention for solving the above technical problem, an electrode includes: a first coating portion formed by applying an active material to a first substrate; and a first electrode terminal portion formed by cutting a portion of a first non-coated portion of the first substrate to which the active material is not applied, and having a shape in which an end is exposed to the outside of the battery or extendable to the outside of the battery.

[0008] The first electrode terminal portion may include a plurality of branch extension portions spaced apart from each other and connected to the first coating portion; a connecting portion interconnecting the branch extension portions; and an external terminal portion connected to the connecting portions with a smaller number or smaller width than the branch extension portions and extending toward the outside of the battery.

[0009] The above branch extension portion, the connecting portion, and the external terminal portion may extend to form a flat surface continuous with the first coating portion.

[0010] The branch extension portion may include a first branch extension portion formed at a position spaced apart from one edge of the first non-coated portion; a second branch extension portion formed at a position spaced apart from the other edge of the first non-coated portion and having a width formed together with the first branch extension portion smaller than the first coating portion; and a first hole portion formed to penetrate between the first branch extension portion and the second branch extension portion.

[0011] The first hole portion may include a first hole end portion that is in contact with the first branch extension portion; a second hole end portion that is in contact with the second branch extension portion; a third hole end portion that is in contact with the first coating portion; and a fourth hole end portion that is in contact with the connecting portion.

[0012] The branch extension portion may further include a third branch extension portion that is spaced apart from the first branch extension portion and the second branch extension portion and has a width formed together with the first branch extension portion and the second branch extension portion that is smaller than the first coating portion; and a second hole portion that is formed to penetrate between the second branch extension portion and the third branch extension portion.

[0013] An electrode assembly according to one embodiment of the present invention includes: a first electrode having a first coated portion formed by coating an active material on a first substrate, and a first electrode terminal portion formed by cutting a portion of a first non-coated portion of the first substrate to which the active material is not coated, and having an end portion that is exposed to the outside of a battery or extendable to the outside of the battery; and a second electrode having a second coated portion formed by coating an active material on a second substrate, and a second electrode terminal portion formed by cutting a portion of a second non-coated portion of the second substrate to which the active material is not coated, and having an end portion that is exposed to the outside of the battery or extendable to the outside of the battery, and being alternately stacked with the first electrode.

[0014] The first electrode may be stacked so that the first electrode terminal portion faces a first direction, and the second electrode may be stacked so that the second electrode terminal portion faces a second direction opposite to the first direction.

[0015] The first electrode and the second electrode may be stacked so that the first electrode terminal portion and the second electrode terminal portion face a first direction, and the first electrode terminal portion and the second electrode terminal portion may be arranged to be spaced apart from each other in a third direction, and the third direction may be a direction other than the first direction or a second direction opposite to the first direction, including a direction perpendicular to the first direction.

[0016] The first electrode is laminated so that the first electrode terminal portion faces a first direction, and the second electrode is laminated so that the second electrode terminal portion faces a third direction. The third direction may include a direction perpendicular to the first direction, and may be a direction other than the first direction or a second direction opposite to the first direction.

[0017] The electrode assembly may further include a bonding means for selectively bonding a plurality of stacked first electrode terminal portions and second electrode terminal portions to each other.

[0018] The first electrode terminal portion may include a plurality of branch extension portions spaced apart from each other and connected to the first coating portion; a connecting portion interconnecting ends of the branch extension portions; and an external terminal portion extending from the connecting portion in a smaller number or with a smaller width than the branch extension portions and extending toward the outside of the battery; wherein the branch extension portion may include: a first branch extension portion formed at a position spaced apart from one edge of the first non-coated portion; a second branch extension portion formed at a position spaced apart from the other edge of the first non-coated portion and having a width formed together with the first branch extension portion smaller than the first coating portion; and a first hole portion formed to penetrate between the first branch extension portion and the second branch extension portion.

[0019] The above electrode assembly may further include a first bonding means for bonding a plurality of stacked first branch extensions to each other through the first hole.

[0020] The first bonding means may be formed by bonding at least a portion of the circumference of the plurality of stacked first branch extensions with an insulating material, or by joining the first branch extensions to each other by welding.

[0021] The electrode assembly may further include a second bonding means for bonding a plurality of stacked connecting portions to each other through the first hole.

[0022] The above electrode assembly may further include a third bonding means for bonding a plurality of the stacked external terminal portions to each other.

[0023] The third bonding means may be formed by bonding at least a portion of the circumference of the plurality of stacked external terminal portions with a conductive material or by welding the external terminal portions together.

[0024] The above third binding means can be connected to the periphery of the external terminal parts to form a set cross-sectional shape together with the external terminal parts.

[0025] A battery according to one embodiment of the present invention includes: the electrode assembly; and a case in which the electrode assembly is accommodated; wherein the first electrode terminal portion may be exposed to the outside of the case or may extend to the outside of the case.

[0026] The above battery further includes a third bonding means for bonding a plurality of stacked first electrode terminal portions to each other, and the third bonding means may be exposed to the outside of the case or may extend to the outside of the case.

[0027] According to an embodiment of the present invention, when manufacturing an electrode, an electrode terminal portion electrically connected to an external terminal outside the battery can be manufactured together with the electrode at one time by utilizing a non-conductive portion.

[0028] Accordingly, compared to the complex structure of connecting the electrode tabs and the current collector and welding a separate plate-shaped component to the current collector to form an electrical connection with the external terminal, the number of components can be significantly reduced. Consequently, the internal resistance generated during battery charging and discharging can be further reduced. Consequently, rapid charging performance can be further improved and the amount of heat generated during battery charging and discharging can be further reduced.

[0029] Furthermore, embodiments of the present invention simplify the manufacturing process by reducing the number of components, thereby improving productivity. Furthermore, the costs associated with procuring components and the resulting increase in battery prices can be reduced. Furthermore, reducing the number of components can reduce the weight of the battery and improve its energy density per unit weight.

[0030] Furthermore, according to an embodiment of the present invention, by combining a fastening means with a branch extension portion and a hole portion formed at the electrode terminal portion of the electrode, lifting of the electrode can be prevented, thereby preventing unwanted side reactions or damage to the electrode due to the electrode flowing or lifting. Accordingly, the performance and operational stability of the battery can be secured.

[0031] The following drawings attached to this specification illustrate preferred embodiments of the present invention, and together with the detailed description of the invention described below, serve to further understand the technical idea of ​​the present invention, and therefore, the present invention should not be interpreted as being limited to matters described in such drawings.

[0032] FIG. 1 is a perspective view schematically showing an example of a battery according to a first embodiment of the present invention.

[0033] FIG. 2 is a perspective view schematically showing another example of a battery according to the first embodiment of the present invention.

[0034] Figure 3 is an exploded perspective view schematically showing a battery according to a first embodiment of the present invention.

[0035] Figure 4 is a perspective view schematically showing an electrode assembly according to a first embodiment of the present invention.

[0036] Figure 5 is an exploded perspective view schematically showing the main parts of an electrode assembly according to a first embodiment of the present invention.

[0037] Figure 6 is a perspective view schematically showing a first electrode according to a first embodiment of the present invention.

[0038] Figure 7 is a schematic diagram schematically showing a first embodiment of a manufacturing process of a first electrode according to a first embodiment of the present invention.

[0039] Figure 8 is a schematic diagram schematically showing a second embodiment of a manufacturing process of a first electrode according to the first embodiment of the present invention.

[0040] Figure 9 is a schematic diagram schematically showing a third embodiment of a manufacturing process of a first electrode according to the first embodiment of the present invention.

[0041] Figure 10 is a schematic diagram schematically showing a fourth embodiment of a manufacturing process of a first electrode according to the first embodiment of the present invention.

[0042] Figure 11 is a schematic diagram schematically showing a fifth embodiment of a manufacturing process of a first electrode according to the first embodiment of the present invention.

[0043] Fig. 12 is a perspective view schematically showing a second electrode according to the first embodiment of the present invention.

[0044] Figure 13 is a schematic diagram schematically showing a manufacturing process of a second electrode according to the first embodiment of the present invention.

[0045] Fig. 14 is a perspective view schematically showing an electrode assembly according to a second embodiment of the present invention.

[0046] Fig. 15 is a perspective view schematically showing a main part of an electrode assembly according to a third embodiment of the present invention.

[0047] Fig. 16 is a perspective view schematically showing a main part of an electrode assembly according to a fourth embodiment of the present invention.

[0048] Fig. 17 is a perspective view schematically showing a main part of an electrode assembly according to a fifth embodiment of the present invention.

[0049] Fig. 18 is a perspective view schematically showing a main part of an electrode assembly according to a sixth embodiment of the present invention.

[0050] Fig. 19 is a perspective view schematically showing a main part of an electrode assembly according to a seventh embodiment of the present invention.

[0051] Fig. 20 is a perspective view schematically showing an electrode assembly according to the eighth embodiment of the present invention.

[0052] Fig. 21 is a perspective view schematically showing a first electrode according to a second embodiment of the present invention.

[0053] Fig. 22 is a perspective view schematically showing a main part of an electrode assembly according to a ninth embodiment of the present invention.

[0054] Figure 23 is a perspective view schematically showing a main part of an electrode assembly according to a tenth embodiment of the present invention.

[0055] Fig. 24 is a perspective view schematically showing a main part of an electrode assembly according to an 11th embodiment of the present invention.

[0056] Figure 25 is a perspective view schematically showing a battery according to a second embodiment of the present invention.

[0057] Fig. 26 is an exploded perspective view schematically showing a battery according to a second embodiment of the present invention.

[0058] Fig. 27 is a perspective view schematically showing an electrode assembly according to the 12th embodiment of the present invention.

[0059] Fig. 28 is an exploded perspective view schematically showing the main parts of an electrode assembly according to the 12th embodiment of the present invention.

[0060] Figure 29 is a schematic diagram schematically showing a manufacturing process of a first electrode according to a third embodiment of the present invention.

[0061] Figure 30 is a schematic diagram schematically showing a manufacturing process of a second electrode according to a third embodiment of the present invention.

[0062] Figure 31 is a perspective view schematically showing a battery according to a third embodiment of the present invention.

[0063] Figure 32 is an exploded perspective view schematically showing a battery according to a third embodiment of the present invention.

[0064] Figure 33 is a perspective view schematically showing an electrode assembly according to the 13th embodiment of the present invention.

[0065] Figure 34 is an exploded perspective view schematically showing the main parts of an electrode assembly according to the 13th embodiment of the present invention.

[0066] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. Prior to this, terms or words used in this specification and claims should not be interpreted as limited to their typical or dictionary meanings, and should be interpreted with meanings and concepts that conform to the technical spirit of the present invention based on the principle that the inventor can appropriately define the concept of a term to best explain his or her own invention. Therefore, the embodiments described in this specification and the configurations illustrated in the drawings are only some of the most preferred embodiments of the present invention and do not represent all of the technical spirit of the present invention. Therefore, it should be understood that various equivalents and modified examples may exist as substitutes for them at the time of filing this application.

[0067] Additionally, when used herein, the terms "comprise", "include" and / or "comprising", "including" specify the presence of stated features, numbers, steps, operations, elements, elements and / or groups thereof, but do not preclude the presence or addition of one or more other features, numbers, operations, elements, elements and / or groups thereof.

[0068] Additionally, to facilitate understanding of the invention, the attached drawings may not be drawn to scale and some components may be exaggerated in size. Furthermore, identical components may be assigned the same reference numbers in different embodiments.

[0069] The statement that two compared objects are "identical" means "substantially identical." Therefore, "substantially identical" may include deviations considered low in the art, such as deviations of less than 5%. Furthermore, uniformity of a parameter over a given region may imply uniformity on average.

[0070] Although terms like "first" and "second" are used to describe various components, these components are not limited by these terms. These terms are used merely to distinguish one component from another, and unless otherwise specified, a "first" component may also be a "second" component.

[0071] Throughout the specification, unless otherwise specifically stated, each element may be singular or plural.

[0072] Any configuration being placed “on top (or bottom)” of a component or “on top (or bottom)” of a component may mean not only that any configuration is placed in contact with the top (or bottom) of the component, but also that other configurations may be interposed between the component and any configuration placed on (or under) the component.

[0073] Additionally, when a component is described as being “on,” “connected to,” or “coupled to” another component, it should be understood that the components may be directly connected or coupled to one another, but that other components may also be “interposed” between the components, or that each component may be “connected,” “coupled,” or “connected” through other components.

[0074] As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items. Furthermore, the use of "may" when describing embodiments of the present disclosure refers to "one or more embodiments of the present disclosure." Expressions such as "one or more" and "one or more" preceding a list of elements modify the list as a whole and do not modify individual elements in the list.

[0075] When reference is made throughout the specification to “A and / or B,” this means A, B, or A and B, unless otherwise stated, and when reference is made to “C to D,” this means C or more and D or less, unless otherwise stated.

[0076] When phrases such as "at least one of A, B, and C," "at least one of A, B, or C," "at least one selected from the group A, B, and C," or "at least one selected from A, B, and C," are used to specify a list of elements A, B, and C, the phrases can refer to any suitable combination.

[0077] The term "use" may be considered synonymous with the term "utilize." As used herein, the terms "substantially," "about," and similar terms are used as terms of approximation rather than degrees, and are intended to take into account inherent variations in measured or calculated values ​​that would be recognized by those skilled in the art.

[0078] Although terms such as first, second, third, etc. may be used herein to describe various elements, components, regions, layers, and / or sections, these elements, components, regions, layers, and / or sections should not be limited by these terms. These terms are used to distinguish one element, component, region, layer, or section from another element, component, region, layer, or section. Thus, a first element, component, region, layer, or section discussed below could also be termed a second element, component, region, layer, or section without departing from the teachings of the exemplary embodiments.

[0079] For ease of description, spatially relative terms such as "beneath," "below," "lower," "above," "upper," and the like may be used herein to describe the relationship of one element or feature to another element(s) or feature(s) as depicted in the drawings. It will be understood that spatially relative positions encompass different orientations of the device in use or operation in addition to the orientations depicted in the figures. For example, if the device in the drawings is turned over, an element described as "beneath" or "lower" another element would be understood to be "above" or "upper" the other element. Thus, the term "beneath" can encompass both the above and below orientations.

[0080] The terminology used herein is for the purpose of describing embodiments of the present disclosure and is not intended to be limiting of the present disclosure.

[0081] In exemplary embodiments of [cylindrical / square / pouch] batteries according to embodiments of the present disclosure, one of the square / pouch / circular batteries is selected and the selected battery is described as having a general structure, and in the case of a generally applicable technology, the general structure of the square / pouch / circular battery is described.

[0082] Hereinafter, when describing the present invention with reference to a plurality of embodiments, redundant descriptions of components that are identical or corresponding across the plurality of embodiments will be omitted. For example, if a configuration identical or corresponding to a configuration disclosed in a first embodiment is disclosed in a second embodiment, the corresponding configuration will be omitted from the description of the second embodiment, and the description will primarily focus on the configurations that have differences compared to the first embodiment. For another example, if a configuration identical or corresponding to a configuration disclosed in either the first or second embodiments is disclosed in a third embodiment, the corresponding configuration will be omitted from the description of the third embodiment, and the description will primarily focus on the configurations that have differences compared to the first and second embodiments.

[0083] FIG. 1 is a perspective view schematically showing an example of a battery according to a first embodiment of the present invention, and FIG. 2 is a perspective view schematically showing another example of a battery according to the first embodiment of the present invention.

[0084] Referring to FIG. 1 and FIG. 2, a battery (1) according to the present embodiment includes an electrode assembly (2) and a case (8) in which the electrode assembly (2) is accommodated.

[0085] The electrode assembly (2) includes a first electrode (4) and a second electrode (5). Either the first electrode (4) or the second electrode (5) may be an anode, and the other may be a cathode. The first electrodes (4) and the second electrodes (5) may be alternately stacked. A plurality of first electrodes (4) may be stacked so as to face a first direction (X direction), and a plurality of second electrodes (5) may be stacked so as to face a direction different from the first direction (X direction).

[0086] A hole (9) that forms a passage for electrical connection between the inside and outside of the case (8) may be formed in the case (8). The end of the first electrode (4) and the end of the second electrode (5) provided in the electrode assembly (2) may have a shape that can be exposed to the outside through the hole (9) formed in the case (8), as shown in FIG. 1. The end of the first electrode (4) and the end of the second electrode (5) may have a shape that can protrude or extend to the outside of the case (8) through the hole (9), as shown in FIG. 2. The end of the first electrode (4) that is exposed, protrudes, or extends to the outside of the case (8) may be the end of the first electrode terminal portion (44) (described below), and the end of the second electrode (5) may be the end of the second electrode terminal portion (54) (described below).

[0087] However, although the case (8) is depicted as a square shape in the drawing, the present invention is not limited thereto, and the case may be configured in various shapes such as a circle or a pouch shape. In addition, the case may be configured of a metal such as aluminum, aluminum alloy, nickel-plated steel, or a laminate film or plastic that constitutes a pouch.

[0088] Referring to Fig. 1, at least one end of the first electrode terminal portion (44) and the second electrode terminal portion (54) is positioned close to the hole portion (9) inside the case (8), and can be electrically connected to an external terminal (not shown) outside the case (8) through the hole portion (9).

[0089] In the description of the present invention, the first electrode terminal portion (44) or the second electrode terminal portion (54) being exposed to the outside of the battery (1) includes being visible to the naked eye from the outside through a hole portion (9) of the case (8), etc., and being positioned in a position that is directly affected by the external environment of the battery (1). In addition, as described above, it includes being positioned close to the hole portion (9) so that it can be directly connected to an external terminal through the hole portion (9) without a separate intermediate member (intermediary member).

[0090] At this time, the first electrode terminal portion (44) or the second electrode terminal portion (54) functions as an intermediate member for electrical connection with an external terminal. Therefore, according to the first electrode (4) or the second electrode (5), the electrode assembly (2), and the battery (1) according to the embodiment of the present invention, even the components corresponding to the intermediate member for connection with an external terminal can be omitted, and the number of components can be further reduced.

[0091] Referring to FIG. 2, at least one end of the first electrode terminal portion (44) and the second electrode terminal portion (54) may protrude and extend to the outside of the case (8) through the hole portion (9) to perform at least a part of the function of an external terminal. Therefore, according to the first electrode (4) or the second electrode (5), the electrode assembly (2), and the battery (1) according to the present embodiment, not only the intermediate member for connection with the external terminal, but also the components corresponding to the external terminal can be omitted, and the number of components can be further reduced.

[0092] The case (8) may include a main body having a container shape that can accommodate an electrode assembly (2) therein, and a cover that is coupled to block an opening of the main body. The main body of the case (8) may have a shape in which one or both ends are open. The hole portions (9) may be formed in positions corresponding to the first electrode terminal portions (44) and the second electrode terminal portions (54), respectively, and may be formed in each of the main body portion and the cover, and a pair of both may be formed only in the main body portion or only in the cover. In the case of having two covers, the hole portions (9) may be formed one by one in each cover.

[0093] FIG. 3 is an exploded perspective view schematically showing a battery according to a first embodiment of the present invention, FIG. 4 is a perspective view schematically showing an electrode assembly according to a first embodiment of the present invention, and FIG. 5 is an exploded perspective view schematically showing a electrode assembly according to a first embodiment of the present invention.

[0094] Referring to FIGS. 1 to 3, a battery (1) according to a first embodiment of the present invention may have a structure in which a positive terminal and a negative terminal are arranged to face opposite directions. Either the first electrode (4) or the second electrode (5) may be a positive electrode, and the other may be a negative electrode. The battery (1) according to the first embodiment of the present invention may include an electrode assembly (2) in which an end of a first electrode terminal portion (44) of the first electrode (4) and an end of a second electrode terminal portion (54) of the second electrode (5) are arranged to face opposite directions.

[0095] A battery (1) according to a first embodiment of the present invention may include a case (8) in which holes (9) are formed at positions corresponding to the first electrode terminal portion (44) and the second electrode terminal portion (54). One hole (9) may be formed in the cover portion of the case (8), and another hole (9) may be formed at a position facing the cover portion in the main body portion of the case (8).

[0096] In the battery (1) according to the first embodiment of the present invention, various embodiments of electrode assemblies (2) in which the first electrode terminal portion (44) and the second electrode terminal portion (54) are arranged in opposite directions can be applied, and in the description of the present invention, the electrode assemblies (2) according to the first to eleventh embodiments will be described in more detail.

[0097] Referring to FIGS. 4 and 5, the electrode assembly (2) according to the first embodiment of the present invention may include a first electrode (4) and a second electrode (5), and may further include a bonding means (6).

[0098] The first electrode (4) may be a positive electrode coated with a positive active material, and the second electrode (5) may be a negative electrode coated with a negative active material. The first electrode (4) and the second electrode (5) may be alternately laminated. The first electrode (4) and the second electrode (5) may be laminated in the Z direction. A plurality of first electrodes (4) may be laminated such that the ends of the first electrode terminal portions (44) face the X direction. A plurality of second electrodes (5) may be laminated such that the ends of the second electrode terminal portions (54) face the opposite direction, that is, the -X direction.

[0099] A separator (7) may be placed between the first electrode (4) and the second electrode (5). However, this is not limited to this, and when applied to an all-solid-state battery, a solid electrolyte (not shown) may be applied instead of the separator (7).

[0100] The bonding means (6) can selectively bond a plurality of stacked first electrode terminal portions (44) and second electrode terminal portions (54) to each other. The bonding means (6) can bond one side of the plurality of first electrode terminal portions (44) and the plurality of second electrode terminal portions (54) to each other. The bonding means (6) can bond a plurality of first electrode terminal portions (44) to each other, and can also bond a plurality of second electrode terminal portions (54) to each other.

[0101] FIG. 6 is a perspective view schematically showing a first electrode according to a first embodiment of the present invention, and FIG. 7 is a schematic diagram schematically showing a manufacturing process of a first electrode according to a first embodiment of the present invention.

[0102] Referring to FIG. 6 and FIG. 7, the first electrode (4) according to the first embodiment of the present invention includes a first coating portion (42) and a first electrode terminal portion (44).

[0103] The first coating portion (42) can be formed by coating a positive electrode active material on the first substrate (41). The first substrate (41) can be a conductive flat plate-shaped member. The first electrode terminal portion (44) can be formed integrally with the first coating portion (42) by cutting off a portion of the first non-coated portion (43) of the first substrate (41) on which the positive electrode active material is not coated.

[0104] Here, the fact that the first coating portion (42) and the first electrode terminal portion (44) are formed integrally means that, rather than manufacturing multiple members corresponding to the first coating portion (42) and the first electrode terminal portion (44) individually and interconnecting and joining them, they are manufactured as one member having a continuous single frame corresponding to the first base material (41).

[0105] The first substrate (41) may have a shape that extends continuously in the X direction and has a first width (d1) in the Y direction. The first substrate (41) may have a shape of a plate in which a plurality of first coating portions (42) and a plurality of first non-coated portions (43) can be formed alternately and continuously along the X direction. The first coating portion (42) may be formed by applying a positive electrode active material to at least one surface of the first substrate (41) at a first set interval and with a set width. A portion corresponding to the first set interval may be a first non-coated portion (43) on which the positive electrode active material is not applied.

[0106] The first electrode terminal portion (44) can be formed by cutting a portion of the first non-coated portion (43) to fit a pre-designed terminal design. Through this manufacturing process, the first coating portion (42) and the first electrode terminal portion (44) can have an integral structure sharing a single framework corresponding to the first base material (41).

[0107] The end of the first electrode terminal portion (44) has a shape that can be exposed to the outside of the case (8) or protrude or extend to the outside of the case (8). Here, the end of the first electrode terminal portion (44) having a shape that can be exposed to the outside of the case (8) includes both the end of the first electrode terminal portion (44) being directly exposed to the outside of the case (8) and the end of the first electrode terminal portion (44) being indirectly exposed to the outside of the case (8) in a state in which it is wrapped by a fastening means (6).

[0108] When coating a liquid active material on the first substrate (41) to a set thickness, the edge of the area where the active material is applied may be thicker than the set thickness, or the thickness may become thinner toward the end and have a slanted shape, or some of the active material may be clumped together to make the thickness uneven. Such edge of the area where the active material is applied may be excluded from the first coating portion (42).

[0109] That is, among the active material application areas, the edge portion where the active material is not coated to a set thickness can be included as part of the first non-coated portion (43), and the first electrode terminal portion (44) can be formed by cutting the first non-coated portion (43). As a result, a portion of the active material may be applied to the branch extension portion (45) (described below) that is continuously connected to the first coating portion (42), but the active material located on the branch extension portion (45) does not participate in the reaction between the electrodes (4, 5).

[0110] FIG. 8 is a schematic diagram schematically showing a second embodiment of a process for manufacturing a first electrode according to a first embodiment of the present invention, FIG. 9 is a schematic diagram schematically showing a third embodiment of a process for manufacturing a first electrode according to a first embodiment of the present invention, FIG. 10 is a schematic diagram schematically showing a fourth embodiment of a process for manufacturing a first electrode according to a first embodiment of the present invention, and FIG. 11 is a schematic diagram schematically showing a fifth embodiment of a process for manufacturing a first electrode according to a first embodiment of the present invention.

[0111] In manufacturing the first electrode (4) according to the first embodiment of the present invention, the manufacturing process of the first electrode (4) is not limited to the first embodiment shown in Fig. 7. In manufacturing the first electrode (4) according to the first embodiment of the present invention, it can be manufactured by applying various other embodiments including the second to fifth embodiments of the manufacturing process of the first electrode (4) shown in Figs. 8 to 11.

[0112] The first substrate (41) has a Y-direction width corresponding to the entire length of the first electrode (4) from the first coating portion (42) to the first electrode terminal portion (44), and may have a band shape extending continuously in the X direction. After applying an active material to one side of the first substrate (41) in the Y direction, the edge of the first coating portion (42) to which the active material is applied and a part of the first non-coated portion (43) to which the active material is not applied are cut together, thereby manufacturing a first electrode (4) having a structure in which the first coating portion (42) and the first electrode terminal portion (44) are integrally formed.

[0113] On one side in the Y direction, a plurality of first coating portions (42) may be formed continuously in the X direction as illustrated in FIG. 8, or may be formed at set intervals in the X direction as illustrated in FIG. 9. At this time, on the other side in the Y direction, a first non-coating portion (43) may be formed continuously in the X direction. In addition, the -Y direction end of the first coating portion (42) may coincide with the -Y direction end of the first base material (41).

[0114] A plurality of first coating portions (42) may be formed at positions spaced apart from the Y-direction edge of the first substrate (41). The plurality of first coating portions (42) may be formed continuously in the X-direction at positions spaced apart from the -Y-direction end of the first substrate (41) in the Y-direction at a set interval, as illustrated in FIG. 10, or may be formed at a set interval in the X-direction, as illustrated in FIG. 11. At this time, a first non-coating portion (43) may be formed continuously in the X-direction on the other side in the Y-direction.

[0115] Referring to Fig. 6, the first electrode terminal portion (44) according to the present embodiment may include a branch extension portion (45), a connection portion (46), and an external terminal portion (47). The branch extension portion (45), the connection portion (46), and the external terminal portion (47) may extend to form a flat surface continuous with the first coating portion (42).

[0116] The branch extension portion (45) may be a portion of the first electrode terminal portion (44) that is continuously connected to the first coating portion (42). The branch extension portion (45) may have a shape that protrudes and extends in the X direction from the first coating portion (42). Two branch extension portions (45) may be formed, including a first branch extension portion (451) and a second branch extension portion (452).

[0117] The first branch extension (451) and the second branch extension (452) may be arranged to be spaced apart from each other in the Y direction. A first hole (454) may be formed between the first branch extension (451) and the second branch extension (452). The first branch extension (451), the second branch extension (452), and the first hole (454) may have various shapes depending on the intended terminal design.

[0118] The first branch extension (451) may be formed at a position spaced apart from the -Y-direction end of the first non-coated portion (43) by a second preset interval in the Y-direction. The second branch extension (452) may be formed at a position spaced apart from the Y-direction end of the first non-coated portion (43) by a third preset interval in the -Y-direction. The first hole (454) may be formed to penetrate between the first branch extension (451) and the second branch extension (452). The Y-direction width (d2) formed by the first branch extension (451), the second branch extension (452), and the first hole (454) may be formed to be smaller than the Y-direction width (d1) of the first coating portion (42).

[0119] The embodiment in which the branch extension portion (45) is formed at a position spaced apart from the -Y-direction end and the Y-direction end of the first non-finger portion (43) is only one of the preferred examples of the present invention. That is, if the branch extension portion (45) can be applied as a part of the first electrode terminal portion (44), it is not limited to being formed at a position spaced apart from the -Y-direction end and the Y-direction end of the first non-finger portion (43). The -Y-direction end or the Y-direction end of the branch extension portion (45) may not be spaced apart from the -Y-direction end or the Y-direction end of the first non-finger portion (43). That is, the -Y-direction end or the Y-direction end of the branch extension portion (45) may coincide with the -Y-direction end or the Y-direction end of the first non-finger portion (43).

[0120] The first branch extension (451) and the second branch extension (452) may have a linear or rectangular shape extending in the X direction. The first hole (454) may have a rectangular shape. The edge of the first hole (454) may have a shape in which the first hole end (455), the second hole end (456), the third hole end (457), and the fourth hole end (458) are continuously connected.

[0121] The first hole end (455) may be a portion of the first hole (454) that is in contact with the first branch extension (451). The second hole end (456) may be a portion of the first hole (454) that is in contact with the second branch extension (452). The third hole end (457) may be a portion of the first hole (454) that is in contact with the first coating portion (42). The fourth hole end (458) may be a portion that is in contact with the connection portion (46).

[0122] The connecting portion (46) may be a portion that interconnects a plurality of branch extension portions (45) among the first electrode terminal portions (44). The connecting portion (46) may interconnect the first branch extension portion (451) and the second branch extension portion (452) at a position spaced apart from the first coating portion (42) in the X direction. The external terminal portion (47) is a portion of the first electrode terminal portion (44) that extends toward the outside of the case (8), and may be connected to the connecting portion (46) with a width (d3) smaller than that of the branch extension portion (45).

[0123] The first coating portion (42) may have a first width (d1) in the Y direction, the branch extension portion (45) and the connection portion (36) may have a second width (d2) smaller than the first width (d1), and the external terminal portion (47) may have a third width (d3) smaller than the second width (d2). In this way, the first electrode terminal portion (44) may have a shape in which the width gradually decreases from the first coating portion (42) toward the outside of the case (8). In this embodiment, the number of branch extension portions (45) and external terminal portions (47) is not particularly limited, but it is preferable that the external terminal portion (47) have a smaller number or a smaller width (d3) than the branch extension portions (45).

[0124] The connecting portion (46) according to the present embodiment may have a linear or rectangular shape extending in the Y direction. The branch extension portion (45) and the connecting portion (46) may together form a '⊂' shape. The connecting portion (46) may have a structure in which the first connecting portion (461) and the second connecting portion (462) are continuously connected.

[0125] The first connecting portion (461) may be formed to extend in the Y direction between the external terminal portion (47) and the first branch extension portion (451). The -Y direction end of the first connecting portion (461) may be connected continuously to the first branch extension portion (451), and the Y direction end of the first connecting portion (461) may be connected continuously to the external terminal portion (47) and the second connecting portion (462). The second connecting portion (462) may be formed to extend in the Y direction between the external terminal portion (47) and the second branch extension portion (452). The -Y direction end of the second connecting portion (462) may be connected continuously to the external terminal portion (47) and the first connecting portion (461), and the Y direction end may be connected continuously to the first branch extension portion (451).

[0126] FIG. 12 is a perspective view schematically showing a second electrode according to a first embodiment of the present invention, and FIG. 13 is a schematic diagram schematically showing a manufacturing process of a second electrode according to a first embodiment of the present invention.

[0127] Referring to FIG. 12 and FIG. 13, the second electrode (5) according to the first embodiment of the present invention includes a second coating portion (52) and a second electrode terminal portion (54).

[0128] The second coating portion (52) can be formed by coating a negative electrode active material on the second substrate (51). The second substrate (51) can be a conductive flat plate-shaped member. The second electrode terminal portion (54) can be formed integrally with the second coating portion (52) by cutting a portion of the second non-coated portion (53) of the second substrate (51) on which the negative electrode active material is not coated. A plurality of second coating portions (52) can be laminated in the Z direction with a plurality of first coating portions (42).

[0129] Here, the fact that the second coating portion (52) and the second electrode terminal portion (54) are formed integrally means that, rather than manufacturing multiple members corresponding to the second coating portion (52) and the second electrode terminal portion (54) individually and interconnecting and joining them, they are manufactured as one member having a continuous single frame corresponding to the second base material (51).

[0130] The second substrate (51) may have a shape that extends continuously in the X direction and has a first width (d1) in the Y direction. The second substrate (51) may have a shape of a plate in which a plurality of second coating portions (52) and a plurality of second non-coated portions (53) can be formed alternately and continuously along the X direction. The second coating portion (52) may be formed by applying a positive electrode active material to at least one surface of the first substrate (41) at a set interval and with a set width. A portion corresponding to this set interval may be a second non-coated portion (53) on which the positive electrode active material is not applied.

[0131] The second electrode terminal portion (54) can be formed by cutting a portion of the second non-coated portion (53) to fit a pre-designed terminal design. Through this manufacturing process, the second coating portion (52) and the second electrode terminal portion (54) can have an integrated structure that shares a single framework corresponding to the second base material (51). The second electrode (5) can be manufactured with the same design as the first electrode (4) and then positioned to face the opposite direction to the first electrode (4).

[0132] The end of the second electrode terminal portion (54) has a shape that can be exposed to the outside of the case (8) or extended to the outside of the case (8). Here, the end of the second electrode terminal portion (54) having a shape that can be exposed to the outside of the case (8) includes both the end of the second electrode terminal portion (54) being directly exposed to the outside of the case (8) and the end of the second electrode terminal portion (54) being indirectly exposed to the outside of the case (8) in a state in which it is wrapped by a fastening means (6).

[0133] Referring to Fig. 12, the second electrode terminal portion (54) according to the present embodiment may have the same shape and structure as or corresponding to the first electrode terminal portion (44). The second electrode terminal portion (54) according to the present embodiment may have the same shape and structure as or corresponding to the first electrode terminal portion (44) including the branch extension portion (45), the connection portion (46), and the external terminal portion (47). When specifically describing the configuration of the second electrode terminal portion (54), the description of the first electrode terminal portion (44) may be substituted.

[0134] Fig. 14 is a perspective view schematically showing an electrode assembly according to a third embodiment of the present invention.

[0135] An electrode assembly (2) according to a third embodiment of the present invention may be formed by alternately stacking first electrodes (4) and second electrodes (5) such that the ends of the first electrode terminal portions (44) and the ends of the second electrode terminal portions (54) face opposite directions. The electrode assembly (2) may form a stack by alternately stacking n first electrodes (4) and n+1 second electrodes (5). At this time, the second electrodes (5) may be arranged at the top and bottom of the stack. A separator (7) may be stacked between n first electrodes (4) and n second electrodes (5). The separator (7) may be additionally arranged at the top and bottom of the stack, so that 2n+2 separators may be provided.

[0136] A plurality of first electrodes (4) may have the same shape and be stacked in the Z direction. The first coating portions (42) may be positioned on the same Z line, and the first electrode terminal portions (44) may be positioned on the same Z line. A plurality of second electrodes (5) may have the same shape and be stacked in the Z direction. The second coating portions (52) may be positioned on the same Z line, and the second electrode terminal portions (54) may be positioned on the same Z line.

[0137] The portion formed by laminating the first coating portion (42) and the second coating portion (52) among the electrode assemblies (2) may have a Z-direction width (height) formed by laminating n first coating portions (42), n+1 second coating portions (52), and 2n+2 separators (7).

[0138] When n first electrodes (4) are stacked, the first electrode terminal portions (44) do not come into contact with the second electrode (5) or the separator (7), and only the first electrode terminal portions (44) face each other. Therefore, the portion corresponding to the first electrode terminal portion (44) in the electrode assembly (2) can have a Z-direction width (height) corresponding to [thickness of the first substrate (41) × n ].

[0139] When n+1 second electrodes (5) are laminated, the second electrode terminal portions (54) do not come into contact with the first electrode (4) or the separator (7), and only the second electrode terminal portions (54) face each other. Therefore, the portion corresponding to the second electrode terminal portion (54) in the electrode assembly (2) can have a Z-direction width (height) corresponding to [thickness of the second substrate (51) × (n+1)]. The portion corresponding to the first electrode terminal portion (44) in the electrode assembly (2) and the portion corresponding to the second electrode terminal portion (54) can have a thinner thickness than the portion formed by laminating the first coating portion (42) and the second coating portion (52) in the electrode assembly (2).

[0140] The electrode assembly (2) according to the third embodiment of the present invention can integrally connect a plurality of first electrode terminal portions (44) and a plurality of second electrode terminal portions (54) by welding or other joining methods. Although not illustrated in Fig. 14, the electrode assembly (2) according to the third embodiment of the present invention can include a connecting means (6) corresponding to a welding portion without using a separate connecting member such as a tape, string, pliers, or other fixing member.

[0141] When applying welding as a bonding means (6), the edges of the first branch extension (451), the edges of the second branch extension (452), the edges of the first connecting portion (461), the edges of the second connecting portion (462), and the edges of the external terminal portion (47) can be selectively joined to each other.

[0142] By bonding a plurality of first electrode terminal portions (44) to each other in close contact with each other by means of a bonding means (6), a plurality of first coating portions (42), a plurality of second coating portions (52), and a plurality of separators (7) can be pressed to each other in close contact in the Z direction, and lifting between the first electrode (4) and the second electrode (5) can be prevented. By bonding the second electrode terminal portions (54) to each other in close contact with each other by means of a bonding means (6), lifting between the first electrode (4) and the second electrode (5) at another location spaced apart from the first electrode terminal portion (44) can be more firmly prevented.

[0143] In connecting the edges of the first branch extension (451), the edges of the second branch extension (452), the edges of the first connection (461), and the edges of the second connection (462), it can be done in a more distributed manner at a plurality of locations through the first hole end (455), the second hole end (456), and the fourth hole end (458) that form the edge of the first hole (454).

[0144] Accordingly, compared to the embodiment in which the first hole (454) is not formed, not only the Y-direction and -Y-direction ends of the first coating portion (42) and the second coating portion (52), but also the Y-direction middle portion of the first coating portion (42) and the second coating portion (52) can be pressed into close contact with each other in the Z direction, and the gap between the first electrode (4) and the second electrode (5) can be more firmly prevented from rising.

[0145] FIG. 15 is a perspective view schematically showing a main part of an electrode assembly according to a third embodiment of the present invention, FIG. 16 is a perspective view schematically showing a main part of an electrode assembly according to a fourth embodiment of the present invention, and FIG. 17 is a perspective view schematically showing a main part of an electrode assembly according to a fifth embodiment of the present invention.

[0146] The electrode assembly (2) according to the third to seventh embodiments illustrated in FIGS. 15 to 19 has a structure that can be selectively applied to the electrode assembly (2) according to the second embodiment illustrated in FIG. 14.

[0147] Referring to FIGS. 15 to 17, the fastening means (6) according to the present embodiment may include a first fastening means (61) that mutually fastens a plurality of branch extension portions (45) stacked in the Z direction, and a second fastening means (62) that mutually fastens a plurality of connecting portions (46) stacked in the Z direction.

[0148] The first binding means (61) and the second binding means (62) may be made of an insulating material and may include binding members such as tapes, strings, clamps, and other fixing members that can bind a plurality of branch extensions (45) together and a plurality of connecting parts (46) together. The first binding means (61) and the second binding means (62) are not limited to a specific structure and shape as long as they can bind a plurality of branch extensions (45) together and a plurality of connecting parts (46) together.

[0149] Referring to Fig. 15, the electrode assembly (2) according to the third embodiment of the present invention may optionally include one or a plurality of first fastening means (61). Among the electrode assembly (2) according to the present invention, a portion formed by stacking a plurality of first branch extension parts (451) in the Z direction (up-down direction) may be fastened to each other in close contact by having its periphery wrapped by the first fastening means (61) or by having at least a portion of the upper and lower portions wrapped.

[0150] Among the electrode assemblies (2) according to the present invention, a portion formed by stacking a plurality of second branch extension parts (452) in the Z direction (up-down direction) can be fastened to each other in close contact by having its periphery wrapped by the first fastening means (61) or by having at least a portion of the upper and lower parts wrapped.

[0151] The first fastening means (61) can be connected by encompassing and wrapping the circumference of a plurality of first branch extension parts (451) stacked in the Z direction through the first hole part (454). A part of the first fastening means (61) wrapping the circumference of the first branch extension part (451) passes through the first hole part (454) in the Z direction while in contact with the first hole end part (455). The plurality of first branch extension parts (451) can be tightly fastened and fixed to each other by the first fastening means (61).

[0152] The first fastening means (61) can be connected to the first branch extension (451) by wrapping around the circumference of a plurality of second branch extensions (452) stacked in the Z direction through the first hole (454). A part of the first fastening means (61) wrapping around the circumference of the first branch extension (451) passes through the first hole (454) in the Z direction while being in contact with the second hole end (456). The plurality of second branch extensions (452) can be fastened and fixed to each other in close contact by the first fastening means (61).

[0153] The first fastening means (61) can fasten a plurality of first branch extensions (451) and a plurality of second branch extensions (452) in a bundle form through the first hole portion (454). As the width of the electrode (3) increases, the middle portion in the width direction is more likely to rise. When the first hole portion (454) is formed, compared to an embodiment in which the first hole portion (454) is not formed, an additional adhesive force in the Z direction can be applied to a plurality of locations corresponding to the first hole end portion (455) and the second hole end portion (456) using the plurality of first fastening means (61). Accordingly, the Y-direction middle portions of the first coating portion (42) and the second coating portion (52) can be pressed more tightly in the Z direction, and the space between the first electrode (4) and the second electrode (5) can be more firmly prevented from rising.

[0154] The first binding means (61) may be an insulating member that binds at least a portion of the circumference of a plurality of stacked first branch extensions (451), as illustrated in Fig. 15. The first binding means (61) may be an insulating member that binds at least a portion of the circumference of a plurality of stacked second branch extensions (452).

[0155] The first fastening means (61) may be formed by welding the edges of the first branch extension portions (451). At this time, a part of the first fastening means (61) may be formed by welding the first hole ends (455) together. The first fastening means (61) may be formed by welding the edges of the second branch extension portions (452). At this time, at least a part of the first fastening means (61) may be formed by welding the second hole ends (456) together (see FIG. 14).

[0156] Referring to Fig. 16, the electrode assembly (2) according to the fourth embodiment of the present invention may optionally include one or a plurality of second fastening means (62). Among the electrode assembly (2) according to the present invention, a portion formed by stacking a plurality of first connecting portions (461) in the Z direction (up-down direction) may be wrapped around its periphery by the second fastening means (62) or at least a portion of the upper and lower portions may be wrapped, thereby allowing the plurality of first connecting portions (461) to be tightly fastened to each other.

[0157] Among the electrode assemblies (2) according to the present invention, a portion formed by stacking a plurality of second connecting portions (462) in the Z direction (up-down direction) can be tightly fastened to each other by having its periphery wrapped by the second fastening means (62) or by having at least a portion of the upper and lower portions wrapped.

[0158] The second fastening means (62) can be connected by surrounding and enclosing the circumference of a plurality of first connecting portions (461) stacked in the Z direction through the first hole (454). A part of the second fastening means (62) surrounding the circumference of the first connecting portion (461) passes through the first hole (454) in the Z direction while in contact with the fourth hole end (458). The plurality of first connecting portions (461) can be tightly connected and fixed to each other by the second fastening means (62).

[0159] The second fastening means (62) can be connected by encompassing and wrapping the circumference of a plurality of second connecting portions (462) stacked in the Z direction through the first hole (454). A part of the second fastening means (62) wrapping the circumference of the second connecting portion (462) passes through the first hole (454) in the Z direction while in contact with the fourth hole end (458). The plurality of second connecting portions (462) can be tightly fastened and fixed to each other by the second fastening means (62).

[0160] The second fastening means (62) can fasten a plurality of first connecting portions (461) and a plurality of second connecting portions (462) in a bundle form through the first hole portion (454). As the width of the electrode (3) increases, the middle portion in the width direction is more likely to rise. When the first hole portion (454) is formed, compared to an embodiment in which the first hole portion (454) is not formed, an additional adhesive force in the Z direction can be applied to a plurality of locations corresponding to a part of the fourth hole end portion (458) and another part using the plurality of second fastening means (62). Accordingly, the first electrode terminal portion (44) and the second electrode terminal portion (54) can be pressed more tightly in the Z direction, and the lifting between the first electrode (4) and the second electrode (5) can be more firmly prevented.

[0161] The second fastening means (62) may be an insulating member that fastens at least a portion of the circumference of the plurality of stacked first connecting portions (461) as illustrated in Fig. 16. The second fastening means (62) may be an insulating member that fastens at least a portion of the circumference of the plurality of stacked second connecting portions (462).

[0162] The second fastening means (62) may be formed by welding the edges of the first connecting portions (461). At this time, a part of the second fastening means (62) may be formed by welding the fourth hole ends (458) together. The second fastening means (62) may be formed by welding the edges of the second connecting portions (462). At this time, a part of the second fastening means (62) may be formed by welding the fourth hole ends (458) together (see FIG. 14).

[0163] Referring to FIG. 17, the electrode assembly (2) according to the fifth embodiment of the present invention can selectively apply the fastening means (6) of the electrode assembly (2) according to the third and fourth embodiments of the present invention illustrated in FIGS. 15 and 16. The electrode assembly (2) according to the fifth embodiment of the present invention can selectively include one or a plurality of first fastening means (61) and second fastening means (62). For example, by including two first fastening means (61) and two second fastening means (62), the plurality of first electrode terminal portions (44) and the plurality of second electrode terminal portions (54) can be pressed and fastened more closely in the Z direction.

[0164] Fig. 18 is a perspective view schematically showing a main part of an electrode assembly according to a sixth embodiment of the present invention, and Fig. 19 is a perspective view schematically showing a main part of an electrode assembly according to a seventh embodiment of the present invention.

[0165] Referring to FIGS. 18 and 19, the bonding means (6) according to the present embodiment may include a third bonding means (63) that mutually bonds a plurality of external terminal portions (47) stacked in the Z direction. The third bonding means (63) may be made of a conductive material and may include a bonding member capable of bonding the plurality of external terminal portions (47) together, such as a tape, a string, a clamp, or other fixing member. The third bonding means (63) is not limited to a specific structure and shape as long as it can mutually bond the plurality of external terminal portions (47). The third bonding means (63) may also include a plate-shaped member corresponding to the first member (41) or the second member (51).

[0166] Among the electrode assemblies (2) according to the present invention, a portion formed by stacking a plurality of external terminal portions (47) in the Z direction (up-down direction) can be fastened to each other in close contact by having its periphery wrapped by the third fastening means (63) or by having at least a portion of the upper and lower portions wrapped.

[0167] The third binding means (63) may be coupled to the periphery of the external terminal portions (47) to form a set cross-sectional shape together with the external terminal portions (47). Referring to FIGS. 4 and 18, the third binding means (63) may have a circular set cross-sectional shape together with a plurality of external terminal portions (47). Referring to FIG. 19, the third binding means (63) may have a rectangular set cross-sectional shape together with a plurality of external terminal portions (47).

[0168] The end of the first electrode terminal portion (44), i.e., the external terminal portion (47), may be directly or indirectly exposed to the outside of the case (8) or extended to the outside of the case (8) in a state in which it is fastened by the third fastening means (63). The end of the second electrode terminal portion (54) may be directly or indirectly exposed to the outside of the case (8) or extended to the outside of the case (8) in a state in which it is fastened by the third fastening means (63).

[0169] The binding means (6) according to the present invention can be selectively applied among the first binding means (61), the second binding means (62), and the third binding means (63) as shown in FIG. 4, FIG. 14 to FIG. 19. In addition, the first binding means (61), the second binding means (62), and the third binding means (63) can be applied in a wider variety of numbers and widths depending on the number and width of the branch extension portion (45), the connection portion (46), and the external terminal portion (47).

[0170] FIG. 20 is a perspective view schematically showing an electrode assembly according to an eighth embodiment of the present invention, and FIG. 21 is a perspective view schematically showing a first electrode according to a second embodiment of the present invention.

[0171] In describing the electrode assembly (2) according to the eighth embodiment of the present invention with reference to FIGS. 20 and 21, among the components of the electrode assembly (2) according to the eighth embodiment of the present invention, components corresponding to the components described in the description of the electrode assembly (2) according to the first to seventh embodiments of the present invention may be replaced with the description of the electrode assembly (2) according to the first to seventh embodiments of the present invention.

[0172] The branch extension portion (45) of the first electrode (4) of the electrode assembly (2) according to the eighth embodiment of the present invention may have a structure that further includes a third branch extension portion (453) and a second hole portion (459) in addition to the first branch extension portion (451), the second branch extension portion (452), and the first hole portion (454) compared to the electrode assembly (2) according to the third embodiment of the present invention illustrated in FIG. 14.

[0173] The third branch extension (453) may be arranged to be spaced apart from the first branch extension (451) and the second branch extension (452) in the Y direction. The first branch extension (451), the second branch extension (452), and the third branch extension (453) may be arranged sequentially in the Y direction, and the second branch extension (452) may be positioned at the widthwise middle of the first electrode (4). The first connection (461) may be positioned between the first branch extension (451) and the second branch extension (452), and the second connection (462) may be positioned between the second branch extension (452) and the third branch extension (453).

[0174] The second hole (459) may be formed to penetrate between the second branch extension (452) and the third branch extension (453). The width (d2) formed by the first branch extension (451), the second branch extension (452), the third branch extension (453), the first hole (454), and the second hole (459) may be smaller than the width (d1) of the first coating portion (42).

[0175] FIG. 22 is a perspective view schematically showing a main part of an electrode assembly according to a ninth embodiment of the present invention, FIG. 23 is a perspective view schematically showing a main part of an electrode assembly according to a tenth embodiment of the present invention, and FIG. 24 is a perspective view schematically showing a main part of an electrode assembly according to an eleventh embodiment of the present invention.

[0176] The electrode assembly (2) according to the 9th to 11th embodiments illustrated in FIGS. 22 to 23 has a structure that can be selectively applied to the electrode assembly (2) according to the 8th embodiment illustrated in FIG. 20.

[0177] Referring to FIG. 22, the electrode assembly (2) according to the ninth embodiment of the present invention may include three first fastening means (61) coupled to each of the first branch extension portion (451), the second branch extension portion (452), and the third branch extension portion (453). Compared to the electrode assembly (2) according to the third embodiment illustrated in FIG. 15, the electrode assembly (2) according to the ninth embodiment of the present invention may further include a first fastening means (61) coupled to the third branch extension portion (453).

[0178] The three first fastening means (61) can be fastened to the first branch extension (451), the second branch extension (452), and the third branch extension (453) through the first hole (454) and the second hole (459). As the number of the first fastening means (61) increases, the first coating parts (42) can be more closely attached to each other.

[0179] The first binding means (61) can mutually bind a plurality of first branch extensions (451) through the first hole (454). The first binding means (61) can mutually bind a plurality of third branch extensions (453) through the second hole (459). The first binding means (61) can mutually bind a plurality of second branch extensions (452) through the first hole (454) and the second hole (459).

[0180] Since the second branch extension (452) is positioned at the widthwise middle portion of the first electrode (4), the middle portions of the first coating portions (42) can be more closely adhered by joining the first fastening means (61) to the periphery of the second branch extension (452). At this time, a part of the first fastening means (61) surrounding the periphery of the second branch extension (543) passes through the first hole (454) in the Z direction, and another part of the first fastening means (61) passes through the second hole (459) in the Z direction.

[0181] If the electrode (3) is moved or lifted, a side reaction may occur or the electrode (3) may be damaged. According to an embodiment of the present invention, by preventing the electrode (3) from lifting by using one or more branch extension parts (45), hole parts (454, 459), and fastening means (6), the occurrence of an undesired side reaction can be prevented, and thus the performance and operational stability of the battery (1) can be secured.

[0182] Referring to FIG. 23, the electrode assembly (2) according to the tenth embodiment of the present invention may include a second fastening means (62) coupled to the circumference of the first connection portion (461) between the first branch extension portion (451) and the second branch extension portion (452). It may include a second fastening means (62) coupled to the circumference of the second connection portion (462) between the second branch extension portion (452) and the third branch extension portion (453).

[0183] The electrode assembly (2) according to the ninth embodiment of the present invention may further include a first fastening means (61) coupled to the third branch extension portion (453), compared to the electrode assembly (2) according to the third embodiment illustrated in FIG. 15.

[0184] The three first fastening means (61) can be fastened to the first branch extension (451), the second branch extension (452), and the third branch extension (453) through the first hole (454) and the second hole (459). As the number of the first fastening means (61) increases, the first coating parts (42) can be more closely attached to each other.

[0185] The first binding means (61) can mutually bind a plurality of first branch extensions (451) through the first hole (454). The first binding means (61) can mutually bind a plurality of third branch extensions (453) through the second hole (459). The first binding means (61) can mutually bind a plurality of second branch extensions (452) through the first hole (454) and the second hole (459).

[0186] Since the second branch extension (452) is positioned at the widthwise middle portion of the first electrode (4), the middle portions of the first coating portions (42) can be more closely adhered by joining the first fastening means (61) to the periphery of the second branch extension (452). At this time, a part of the first fastening means (61) surrounding the periphery of the second branch extension (543) passes through the first hole (454) in the Z direction, and another part of the first fastening means (61) passes through the second hole (459) in the Z direction.

[0187] Referring to FIG. 24, the electrode assembly (2) according to the eleventh embodiment of the present invention can selectively apply the fastening means (6) of the electrode assembly (2) according to the eighth and ninth embodiments illustrated in FIGS. 20 and 21. The electrode assembly (2) according to the eleventh embodiment of the present invention can selectively include one or a plurality of first fastening means (61) and second fastening means (62). For example, by including three first fastening means (61) and two second fastening means (62), the plurality of first electrode terminal portions (44) and the plurality of second electrode terminal portions (54) can be pressed and fastened more closely in the Z direction.

[0188] The embodiments of the first electrode terminal portion (44) and the second electrode terminal portion (54) according to the present invention disclose preferred embodiments of the present invention, and are not intended to be limited thereto. The branch extension portion (45), the connection portion (46), and the external terminal portion (47) provided in the first electrode terminal portion (44) and the second electrode terminal portion (54) according to the present invention can be applied in various ways in terms of number, width, and position.

[0189] For example, as the width of the electrode (3) expands, the central portion of the electrode (3), more specifically, the central portions of the first coating portion (42) and the second coating portion (52), are more likely to be lifted. However, as the number of branch extension portions (45), hole portions (454, 459), and first fastening means (61) increases, the movement and lifting of the electrode (3) can be more firmly prevented. Accordingly, as the width of the electrode (3) expands, the number of branch extension portions (45) and hole portions (454, 459) can be further increased to prevent the movement and lifting of the electrode (3).

[0190] FIG. 25 is a perspective view schematically showing a battery according to a second embodiment of the present invention, and FIG. 26 is an exploded perspective view schematically showing a main part of a battery according to a second embodiment of the present invention.

[0191] Referring to FIGS. 25 and 26, a battery (1) according to a second embodiment of the present invention may have a structure in which a positive terminal and a negative terminal are arranged to face the same direction. For example, the positive terminal and the negative terminal may be arranged to face the X direction.

[0192] A battery (1) according to a second embodiment of the present invention may include an electrode assembly (2) in which an end of a first electrode terminal portion (44) of a first electrode (4) and an end of a second electrode terminal portion (54) of a second electrode (5) are arranged to face the same direction.

[0193] A battery (1) according to a second embodiment of the present invention may include a case (8) in which holes (9) are formed at positions corresponding to the first electrode terminal portion (44) and the second electrode terminal portion (54), respectively. Two holes (9) may be formed in parallel on a cover portion forming one side of the case (8) in the X direction. When the main body of the case (8) forms one side of the case in the X direction, two holes (9) may be formed on the main body of the case (8).

[0194] The battery (1) according to the second embodiment of the present invention may be applied with various embodiments of electrode assemblies (2) in which the first electrode terminal portion (44) and the second electrode terminal portion (54) are arranged to face the same direction. The electrode assembly (2) provided in the battery (1) according to the second embodiment of the present invention may have a structure of a first electrode (4), a second electrode (5), and a bonding means (6) that selectively combines any one or at least some of the electrode assemblies (2) according to the first to eleventh embodiments exemplified in the description of the battery (1) according to the first embodiment of the present invention.

[0195] Fig. 27 is a perspective view schematically showing an electrode assembly according to a 12th embodiment of the present invention, and Fig. 28 is an exploded perspective view schematically showing a main part of an electrode assembly according to a 12th embodiment of the present invention.

[0196] Referring to FIG. 27 and FIG. 28, the electrode assembly (2) according to the second embodiment of the present invention may include a first electrode (4) and a second electrode (5), similar to the electrode assembly (2) according to the first embodiment of the present invention, and may further include a bonding means (6).

[0197] The first electrode (4) may be a positive electrode coated with a positive active material, and the second electrode (5) may be a negative electrode coated with a negative active material. The first electrode (4) and the second electrode (5) may be alternately laminated. The first electrode (4) and the second electrode (5) may be laminated in the Z direction. A separator (7) may be disposed between the first electrode (4) and the second electrode (5).

[0198] A plurality of first electrodes (4) can be stacked so that the ends of the first electrode terminal portions (44) face the X direction. A plurality of second electrodes (5) can be stacked so that the ends of the second electrode terminal portions (54) face the X direction. The first electrode terminal portions (44) and the second electrode terminal portions (54) can be arranged to be spaced apart from each other in the Y direction.

[0199] The bonding means (6) can selectively bond a plurality of stacked first electrode terminal portions (44) and second electrode terminal portions (54) to each other. The bonding means (6) can bond one side of the plurality of first electrode terminal portions (44) and the plurality of second electrode terminal portions (54) to each other. The bonding means (6) can bond a plurality of first electrode terminal portions (44) to each other, and can also bond a plurality of second electrode terminal portions (54) to each other.

[0200] FIG. 29 is a schematic diagram schematically showing a manufacturing process of a first electrode according to a third embodiment of the present invention, and FIG. 30 is a schematic diagram schematically showing a manufacturing process of a second electrode according to a third embodiment of the present invention.

[0201] Referring to FIG. 28 and FIG. 29, the first electrode (4) according to the third embodiment of the present invention includes a first coating portion (42) and a first electrode terminal portion (44).

[0202] The first coating portion (42) can be formed by coating a positive electrode active material on the first substrate (41). The first substrate (41) can be a conductive flat plate-shaped member. The first electrode terminal portion (44) can be formed integrally with the first coating portion (42) by cutting off a portion of the first non-coated portion (43) of the first substrate (41) on which the positive electrode active material is not coated.

[0203] Here, the fact that the first coating portion (42) and the first electrode terminal portion (44) are formed integrally means that, rather than manufacturing multiple members corresponding to the first coating portion (42) and the first electrode terminal portion (44) individually and interconnecting and joining them, they are manufactured as one member having a continuous single frame corresponding to the first base material (41).

[0204] The first substrate (41) may have a shape that extends continuously in the X direction and has a first width (d1) in the Y direction. The first substrate (41) may have a shape of a plate in which a plurality of first coating portions (42) and a plurality of first non-coated portions (43) can be formed alternately and continuously along the X direction. The first coating portion (42) may be formed by applying a positive electrode active material to at least one surface of the first substrate (41) at a first set interval and with a set width. A portion corresponding to the first set interval may be a first non-coated portion (43) on which the positive electrode active material is not applied (see d1 of FIG. 6 and FIG. 12).

[0205] The first electrode terminal portion (44) can be formed by cutting a portion of the first non-coated portion (43) to fit a pre-designed terminal design. Through this manufacturing process, the first coating portion (42) and the first electrode terminal portion (44) can have an integral structure sharing a single framework corresponding to the first base material (41).

[0206] Referring to FIG. 28 and FIG. 30, the second electrode (5) according to the first embodiment of the present invention includes a second coating portion (52) and a second electrode terminal portion (54).

[0207] The second coating portion (52) can be formed by coating a negative electrode active material on the second substrate (51). The second substrate (51) can be a conductive flat plate-shaped member. The second electrode terminal portion (54) can be formed integrally with the second coating portion (52) by cutting off a portion of the second non-coated portion (53) of the second substrate (51) on which the negative electrode active material is not coated.

[0208] Here, the fact that the second coating portion (52) and the second electrode terminal portion (54) are formed integrally means that, rather than manufacturing multiple members corresponding to the second coating portion (52) and the second electrode terminal portion (54) individually and interconnecting and joining them, they are manufactured as one member having a continuous single frame corresponding to the second base material (51).

[0209] The second substrate (51) may have a shape that extends continuously in the X direction and has a first width (d1) in the Y direction. The second substrate (51) may have a shape of a plate in which a plurality of second coating portions (52) and a plurality of second non-coated portions (53) can be formed alternately and continuously along the X direction. The second coating portion (52) may be formed by applying a positive electrode active material to at least one surface of the first substrate (41) at a set interval and with a set width. A portion corresponding to this set interval may be a second non-coated portion (53) on which the positive electrode active material is not applied (see d1 of FIG. 6 and FIG. 12).

[0210] The second electrode terminal portion (54) can be formed by cutting a portion of the second non-coated portion (53) to fit a pre-designed terminal design. Through this manufacturing process, the second coating portion (52) and the second electrode terminal portion (54) can have an integrated structure that shares a single framework corresponding to the second base material (51). The second electrode (5) can be manufactured with the same design as the first electrode (4) and then positioned to face the opposite direction to the first electrode (4).

[0211] A plurality of second coating portions (52) can be laminated with a plurality of first coating portions (42) in the Z direction. A plurality of first electrode terminal portions (44) can be laminated in the Z direction. The second electrode terminal portion (54) can have the same shape as the first electrode terminal portion (44). The second electrode terminal portion (54) can be arranged at a position spaced apart from the first electrode terminal portion (44) in the Y direction. The plurality of second electrode terminal portions (54) can be laminated in the Z direction.

[0212] The first electrode terminal portion (44) and the second electrode terminal portion (54) can be arranged in parallel in the Y direction. The end of the first electrode terminal portion (44) and the end of the second electrode terminal portion (54) have a shape that can be exposed to the outside of the X-direction end of the case (8) or can extend to the outside of the case (8). The end of the first electrode terminal portion (44) and the end of the second electrode terminal portion (54) can be positioned in parallel on one side of the X direction of the case (8).

[0213] Here, the fact that the end of the first electrode terminal portion (44) and the end of the second electrode terminal portion (54) have a shape that can be exposed to the outside of the case (8) includes being directly exposed to the outside of the case (8) as well as being indirectly exposed to the outside of the case (8) in a state in which they are wrapped by a fastening means (6).

[0214] The first coating portion (42) of the first electrode (4) may have a first width (d1) in the Y direction. The second coating portion (52) of the second electrode (5) may have a first width (d1) in the Y direction. The first electrode terminal portion (44) may have a shape in which the width gradually decreases from the first coating portion (42) toward the outside of the case (8). The second electrode terminal portion (54) may have a shape in which the width gradually decreases from the second coating portion (52) toward the outside of the case (8).

[0215] The first electrode terminal portion (44) may have a width smaller than the first width (d1). The second electrode terminal portion (54) may have a width smaller than the first width (d1). The Y-direction width formed by the first electrode terminal portion (44) and the second electrode terminal portion (54) together may be a second width (d2) smaller than the first width (d1). The end of the first electrode terminal portion (44) and the end of the second electrode terminal portion (54) that are exposed or extended to the outside of the case (8) may together have a Y-direction width smaller than the second width (d2) (see d1 and d2 of FIGS. 6 and 12).

[0216] In describing the battery (1) according to the second embodiment of the present invention, components corresponding to those described in the description of the battery (1) according to the first embodiment of the present invention may be replaced with the description of the battery (1) according to the first embodiment of the present invention.

[0217] FIG. 31 is a perspective view schematically showing a battery according to a third embodiment of the present invention, and FIG. 32 is an exploded perspective view schematically showing a main part of a battery according to a third embodiment of the present invention.

[0218] Referring to FIGS. 31 and 32, a battery (1) according to a third embodiment of the present invention may have a structure in which a positive terminal and a negative terminal are arranged to face in different directions, rather than the same or opposite directions. The positive terminal may be arranged to face the X direction, and the negative terminal may be arranged to face a direction other than the X direction or the -X direction. For example, the positive terminal may be arranged to face the X direction, and the negative terminal may be arranged to face the Y direction.

[0219] One of the first electrode (4) and the second electrode (5) may be a positive electrode, and the other may be a negative electrode. A battery (1) according to a third embodiment of the present invention may include an electrode assembly (2) in which an end of a first electrode terminal portion (44) of the first electrode (4) and an end of a second electrode terminal portion (54) of the second electrode (5) are arranged to face each other in a direction forming one of an acute angle, a right angle, and an obtuse angle.

[0220] A battery (1) according to a third embodiment of the present invention may include a case (8) in which holes (9) are formed at positions corresponding to the first electrode terminal portion (44) and the second electrode terminal portion (54), respectively. The case (8) may include a main body portion having an open shape at an X-direction end portion and a Y-direction end portion, and two cover portions respectively coupled to the X-direction opening portion and the Y-direction opening portion. A hole portion (9) may be formed in each of the two cover portions. The end portion of the first electrode terminal portion (44) and the end portion of the second electrode terminal portion (54) may be exposed to the outside of the case (8) through the two holes (9) or may be arranged to protrude or extend to the outside of the case (8).

[0221] According to the third embodiment of the present invention, the battery (1) may be applied with various embodiments of electrode assemblies (2) in which the first electrode terminal portion (44) and the second electrode terminal portion (54) are arranged to form an acute angle, a right angle, or an obtuse angle. The electrode assembly (2) provided in the battery (1) according to the third embodiment of the present invention may have a structure of a first electrode (4), a second electrode (5), and a bonding means (6) that selectively combines any one or at least some of the electrode assemblies (2) according to the first to eleventh embodiments exemplified in the description of the battery (1) according to the first embodiment of the present invention.

[0222] FIG. 33 is a perspective view schematically showing an electrode assembly according to a 13th embodiment of the present invention, and FIG. 34 is an exploded perspective view schematically showing a main part of an electrode assembly according to a 13th embodiment of the present invention.

[0223] Referring to FIG. 33 and FIG. 34, an electrode assembly (2) according to a third embodiment of the present invention may include a first electrode (4) and a second electrode (5), similar to the electrode assembly (2) according to the first embodiment of the present invention, and may further include a bonding means (6).

[0224] The first electrode (4) may be a positive electrode coated with a positive active material, and the second electrode (5) may be a negative electrode coated with a negative active material. The first electrode (4) and the second electrode (5) may be alternately laminated. The first electrode (4) and the second electrode (5) may be laminated in the Z direction. A separator (7) may be disposed between the first electrode (4) and the second electrode (5).

[0225] A plurality of first electrodes (4) can be stacked so that the ends of the first electrode terminal portions (44) face the X direction. A plurality of second electrodes (5) can be stacked so that the ends of the second electrode terminal portions (54) face the Y direction. A plurality of second electrodes (5) can be stacked so that the ends of the second electrode terminal portions (54) face a direction other than the X direction, the -X direction, or the Y direction.

[0226] The bonding means (6) can selectively bond a plurality of stacked first electrode terminal portions (44) and second electrode terminal portions (54) to each other. The bonding means (6) can bond one side of the plurality of first electrode terminal portions (44) and the plurality of second electrode terminal portions (54) to each other. The bonding means (6) can bond a plurality of first electrode terminal portions (44) to each other, and can also bond a plurality of second electrode terminal portions (54) to each other.

[0227] In describing the battery (1) according to the third embodiment of the present invention, components corresponding to those described in the description of the battery (1) according to the first and second embodiments of the present invention may be replaced with the description of the battery (1) according to the first and second embodiments of the present invention.

[0228] The embodiments of the electrode, electrode assembly, and battery according to the present invention described above disclose preferred embodiments of the present invention, and are not intended to be limiting. The first electrode terminal portion (44) and the second electrode terminal portion (54) according to the present invention are not limited to a specific shape (design), including the embodiments described above, as long as their ends can be exposed or protruded outside the case (8).

[0229] According to the electrode, electrode assembly and battery according to the present invention having the above configuration, when manufacturing the electrode (3), the electrode terminal portion (44, 54) electrically connected to the external terminal (not shown) on the outside of the battery (1) can be manufactured together with the electrode (3) as one body at a time by utilizing the non-conductive portion (43, 53).

[0230] Accordingly, according to the present invention, the number of components can be reduced compared to the existing complex structure of connecting the electrode tab and the current collector and welding a separate plate-shaped component to the current collector to form an electrical connection with the external terminal. Accordingly, the internal resistance of the battery generated during battery charging and discharging can be further reduced. Accordingly, the rapid charging performance can be further improved, and the amount of heat generated during battery charging and discharging can be further reduced.

[0231] Furthermore, according to the present invention, by reducing the number of components, the manufacturing process can be simplified, thereby improving productivity. Furthermore, the costs associated with procuring components and the resulting increase in battery prices can be reduced. Furthermore, by reducing the number of components, the weight of the battery (1) can be reduced, and the energy density per weight (Wh / kg) can be improved.

[0232] In addition, according to the present invention, by connecting the fastening means (6) to the branch extension portion (45) and the hole portion (454, 459) formed in the electrode terminal portion (44, 54) of the electrode (3), lifting of the electrode (3) can be prevented, thereby preventing unwanted side reactions from occurring or damage to the electrode (3) due to the electrode (3) flowing or lifting. Accordingly, the performance and operational stability of the battery (1) can be secured.

[0233] Although the present invention has been described above with reference to limited embodiments and drawings, the present invention is not limited thereto, and it is obvious that various modifications and variations are possible within the scope of the technical idea of ​​the present invention and the equivalent scope of the patent claims to be described below by a person having ordinary skill in the art to which the present invention pertains.

Claims

1. A first coating portion formed by applying an active material to a first substrate; and An electrode characterized by including a first electrode terminal portion formed by cutting a portion of a first base material to which an active material is not applied, and having an end portion that is exposed to the outside of the battery or has a shape extendable to the outside of the battery.

2. In paragraph 1, The above first electrode terminal portion, A branch extension portion having a plurality of branches spaced apart from each other and connected to the first coating portion; A connecting portion interconnecting the above branch extension portions; and An electrode characterized by including an external terminal portion connected to the connecting portion and extending toward the outside of the battery, the external terminal portion having a smaller number or smaller width than the branch extension portion.

3. In paragraph 2, An electrode characterized in that the branch extension portion, the connection portion, and the external terminal portion extend to form a flat surface continuous with the first coating portion.

4. In paragraph 2, The above branch extension part is, A first branch extension formed at a position spaced apart from one edge of the first branch; A second branch extension portion formed at a position spaced apart from the other edge of the first branch portion and having a width formed together with the first branch extension portion smaller than the first coating portion; and An electrode characterized by including a first hole formed to penetrate between the first branch extension portion and the second branch extension portion.

5. In paragraph 4, The above first hole is, A first hole end in contact with the first branch extension; A second hole end in contact with the second branch extension portion; A third hole end in contact with the first coating portion; and An electrode characterized by including a fourth hole end in contact with the above connecting portion.

6. In paragraph 4, The above branch extension part is, A third branch extension portion that is spaced apart from the first branch extension portion and the second branch extension portion, and whose width formed together with the first branch extension portion and the second branch extension portion is smaller than that of the first coating portion; and An electrode characterized by further including a second hole formed to penetrate between the second branch extension portion and the third branch extension portion.

7. A first electrode having a first coating portion formed by applying an active material to a first substrate, and a first electrode terminal portion formed by cutting a portion of a first non-coated portion of the first substrate on which the active material is not applied, and having an end portion that is exposed to the outside of the battery or has a shape that can extend to the outside of the battery; and An electrode assembly characterized by comprising a second electrode, which comprises a second coated portion formed by applying an active material to a second substrate, and a second electrode terminal portion formed by cutting a portion of a second non-coated portion of the second substrate on which the active material is not applied, and an end portion of which is exposed to the outside of the battery or extends to the outside of the battery, and which is alternately stacked with the first electrode.

8. In paragraph 7, The above first electrode is laminated so that the first electrode terminal portion faces the first direction, An electrode assembly characterized in that the second electrode is laminated so that the second electrode terminal portion faces a second direction opposite to the first direction.

9. In paragraph 7, The first electrode and the second electrode are stacked so that the first electrode terminal portion and the second electrode terminal portion face the first direction, and the first electrode terminal portion and the second electrode terminal portion are arranged to be spaced apart from each other in the third direction. An electrode assembly characterized in that the third direction is a direction other than the first direction or a second direction opposite to the first direction, including a direction perpendicular to the first direction.

10. In paragraph 7, The above first electrode is laminated so that the first electrode terminal portion faces the first direction, The second electrode is laminated so that the second electrode terminal portion faces the third direction, An electrode assembly characterized in that the third direction is a direction other than the first direction or a second direction opposite to the first direction, including a direction perpendicular to the first direction.

11. In paragraph 7, An electrode assembly characterized by further comprising a bonding means for selectively bonding a plurality of the first electrode terminal portions and the second electrode terminal portions to each other.

12. In paragraph 7, The above first electrode terminal portion, A branch extension portion having a plurality of branches spaced apart from each other and connected to the first coating portion; A connecting portion that interconnects the ends of the above branch extension portions; and An external terminal portion extending from the above connecting portion in a smaller number or smaller width than the branch extension portion and extending toward the outside of the battery; The above branch extension part is, A first branch extension formed at a position spaced apart from one edge of the first branch; A second branch extension portion formed at a position spaced apart from the other edge of the first branch portion and having a width formed together with the first branch extension portion smaller than the first coating portion; and An electrode assembly characterized by including a first hole formed to penetrate between the first branch extension portion and the second branch extension portion.

13. In paragraph 12, An electrode assembly characterized by further comprising a first bonding means for bonding a plurality of the first branch extension portions that are stacked to each other through the first hole portion.

14. In paragraph 13, The electrode assembly characterized in that the first bonding means is formed by bonding at least a portion of the circumference of the plurality of stacked first branch extensions with an insulating material or by welding the first branch extensions together.

15. In paragraph 12, An electrode assembly characterized in that it further includes a second bonding means for bonding a plurality of stacked connecting parts to each other through the first hole.

16. In paragraph 12, An electrode assembly characterized by further comprising a third bonding means for bonding a plurality of the stacked external terminal portions to each other.

17. In paragraph 16, An electrode assembly characterized in that the third bonding means is formed by bonding at least a portion of the circumference of the plurality of stacked external terminal parts with a conductive material or by welding the external terminal parts together.

18. In paragraph 17, An electrode assembly characterized in that the third bonding means is bonded to the periphery of the external terminal portions and forms a set cross-sectional shape together with the external terminal portions.

19. An electrode assembly according to any one of claims 7 to 18; and A case in which the electrode assembly is accommodated; A battery characterized in that the first electrode terminal portion is exposed to the outside of the case or extends to the outside of the case.

20. In paragraph 19, Further comprising a third bonding means for bonding a plurality of the first electrode terminal portions that are stacked together; A battery characterized in that the third binding means is exposed to the outside of the case or extends to the outside of the case.

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