Secondary battery and method of manufacturing secondary battery

Abstract

Disclosed is a secondary battery and a method of manufacturing a secondary battery. The secondary battery includes: an electrode assembly including a plurality of electrodes stacked, each of the plurality of electrodes including: a mixed portion having a first width; and an uncoated portion having a second width equal to the first width and extending from the mixed portion, and a plurality of the uncoated portions are stacked to form an uncoated portion bundle; and a current collecting member covering at least two surfaces of the uncoated portion bundle and connected to the uncoated portion bundle.

Description

Technical Field

[0001] Embodiments of this disclosure relate to a secondary battery and a method of manufacturing a secondary battery. Background Technology

[0002] Unlike primary batteries, which cannot be recharged, secondary batteries are batteries that can be charged and discharged. Low-capacity secondary batteries can be used in small portable electronic devices such as smartphones, feature phones, laptops, digital cameras, and camcorders, while high-capacity secondary batteries are widely used as motor drive power sources in hybrid vehicles, electric vehicles, and as energy storage batteries. These secondary batteries include an electrode assembly containing electrodes (including positive and negative electrodes), a housing of the electrode assembly, and electrode terminals connected to the electrode assembly.

[0003] The information disclosed in the background section of this disclosure is provided to facilitate understanding of the background of this disclosure and may include information that does not constitute related technology. Summary of the Invention

[0004] According to one aspect of the embodiments of this disclosure, a secondary battery using an entirely uncoated portion and a method for manufacturing the secondary battery are provided.

[0005] According to another aspect of the embodiments of this disclosure, a secondary battery capable of utilizing the uncoated portion as is without the need for cutting, and a method for manufacturing the secondary battery are provided.

[0006] According to another aspect of the embodiments of this disclosure, a secondary battery with increased contact area between the uncoated portion and the current collector is provided, as well as a method for manufacturing the secondary battery.

[0007] According to another aspect of the embodiments of this disclosure, a secondary battery including a novel current collector and a method for manufacturing the secondary battery are provided.

[0008] However, the aspects of this disclosure and the technical problems to be solved by this disclosure are not limited to the above-described aspects and problems, and those skilled in the art can clearly understand other aspects and problems not described from the following description of this disclosure.

[0009] According to one or more embodiments, a secondary battery includes: an electrode assembly comprising a plurality of stacked electrodes, each of the plurality of electrodes comprising: a mixing portion having a first width; and an uncoated portion having a second width equal to the first width and extending from the mixing portion, wherein the plurality of uncoated portions are stacked to form an uncoated portion bundle; and a current collector covering at least two surfaces of the uncoated portion bundle and connected to the uncoated portion bundle.

[0010] In one or more embodiments, the current collector may include a front surface member located in the direction in which the uncoated portion extends and in contact with the front surface of the end portion of the uncoated portion bundle.

[0011] In one or more embodiments, the current collection member may further include: a first member connected to the front surface member, extending in a direction perpendicular to the front surface member, extending parallel to the uncoated portion, and contacting a first surface of the uncoated portion bundle; and a second member connected to the front surface member, extending in the direction perpendicular to the front surface member, and contacting a second surface of the uncoated portion bundle, the second surface being positioned opposite to the first surface.

[0012] In one or more embodiments, at least one of the first member and the second member may be configured as one or more plates extending from the front surface member.

[0013] In one or more embodiments, the flow collector may include a bent portion with a groove at the boundary between the front surface member and at least one of the first member and the second member.

[0014] In one or more embodiments, the current collection member may further include: a third member connected to the front surface member, extending in a direction perpendicular to the front surface member and contacting a third surface of the uncoated portion bundle, the third surface being a stacked surface of the uncoated portions; and a fourth member connected to the front surface member, extending in the direction perpendicular to the front surface member and contacting a fourth surface of the uncoated portion bundle, the fourth surface being positioned opposite to the third surface.

[0015] In one or more embodiments, at least one of the third and fourth components may be configured as one or more plates extending from the front surface component.

[0016] In one or more embodiments, the flow collector may further include a bent portion with a groove formed at the boundary between the front surface member and at least one of the third and fourth members.

[0017] In one or more embodiments, the current collection member may further include: a first member connected to the front surface member, extending in a direction perpendicular to the front surface member, extending parallel to the uncoated portion, and contacting a first surface of the uncoated portion bundle; a second member connected to the front surface member, extending in the direction perpendicular to the front surface member, and contacting a second surface of the uncoated portion bundle, the second surface being positioned opposite to the first surface; a third member connected to the front surface member, extending in the direction perpendicular to the front surface member, and contacting a third surface of the uncoated portion bundle, the third surface being a stacked surface of the uncoated portions; and a fourth member connected to the front surface member, extending in the direction perpendicular to the front surface member, and contacting a fourth surface of the uncoated portion bundle, the fourth surface being positioned opposite to the third surface, wherein the third surface is positioned adjacent to each of the first surface and the second surface.

[0018] In one or more embodiments, the current collector may further include a first weld line connecting the front surface member and the uncoated portion bundle and parallel to the stacking direction of the uncoated portions.

[0019] In one or more embodiments, the current collector may further include a second weld line connecting the front surface member and the uncoated portion bundle and perpendicular to the stacking direction of the uncoated portions.

[0020] In one or more embodiments, the secondary battery may further include: a coating member on the current collector and configured to reduce friction between the current collector and the uncoated portion of the bundle.

[0021] In one or more embodiments, the secondary battery may further include: an adhesive member on the current collector and configured to bond the current collector and the uncoated portion bundle together.

[0022] In one or more embodiments, the secondary battery may further include: an insulating member that surrounds the uncoated portion at the boundary between the mixed portion and the uncoated portion, and includes an insulating material.

[0023] In one or more embodiments, the electrode assembly may include a first electrode, a second electrode, and a diaphragm between the first electrode and the second electrode, the first electrode, the second electrode, and the diaphragm being stacked, and the uncoated portion bundle may include: a first uncoated portion bundle extending from the first electrode to a first side of the electrode assembly; and a second uncoated portion bundle extending from the second electrode to a second side of the electrode assembly.

[0024] In one or more embodiments, the current collector may include: a first current collector located on the first side of the electrode assembly and connected to the first uncoated portion bundle; and a second current collector located on the second side of the electrode assembly and connected to the second uncoated portion bundle.

[0025] In one or more embodiments, the current collector can be arranged so as not to overlap with the diaphragm in the stacking direction of the first electrode, the second electrode, and the diaphragm.

[0026] According to one or more embodiments, a method of manufacturing a secondary battery includes an electrode assembly formed by stacking a plurality of electrodes, each of the plurality of electrodes including: a mixed portion having a first width; and an uncoated portion having a second width equal to the first width and extending from the mixed portion, the method comprising: securing an uncoated portion bundle formed by stacking the plurality of uncoated portions; arranging a current collector to cover at least two surfaces of the uncoated portion bundle; and welding the current collector to the uncoated portion bundle.

[0027] In one or more embodiments, arranging the current collector may include sliding the current collector onto the uncoated portion of the bundle.

[0028] In one or more embodiments, arranging the current collector may include bending the bent portion of the current collector while it is being rolled to correspond to the shape of the uncoated portion bundle. Attached Figure Description

[0029] The accompanying drawings illustrate some embodiments of the present disclosure and further describe aspects and features of the disclosure together with the detailed description thereof. However, the disclosure should not be construed as limited to the drawings, in which:

[0030] Figure 1 This is a perspective view schematically illustrating a secondary battery according to an embodiment of the present disclosure;

[0031] Figure 2 This is a schematic illustration of a secondary battery according to an embodiment of the present disclosure;

[0032] Figure 3 This is an exploded view schematically illustrating a secondary battery according to an embodiment of the present disclosure;

[0033] Figure 4 This is an exploded view schematically illustrating an electrode assembly according to an embodiment of the present disclosure;

[0034] Figure 5This is a schematic view illustrating electrodes according to an embodiment of the present disclosure;

[0035] Figure 6 This is a perspective view schematically illustrating an electrode assembly according to an embodiment of the present disclosure;

[0036] Figure 7 This is a perspective view schematically illustrating a current collection component according to an embodiment of the present disclosure;

[0037] Figure 8 This is a perspective view schematically illustrating an example in which a current collector is mounted on an electrode assembly according to an embodiment of the present disclosure;

[0038] Figure 9 This is a perspective view schematically illustrating a current collection component according to an embodiment of the present disclosure;

[0039] Figure 10 This is a perspective view schematically illustrating a current collection component according to an embodiment of the present disclosure;

[0040] Figure 11 This is a perspective view schematically illustrating a current collection component according to an embodiment of the present disclosure;

[0041] Figure 12 This is a perspective view schematically illustrating a current collection component according to an embodiment of the present disclosure;

[0042] Figure 13 This is a perspective view schematically illustrating a current collection component according to an embodiment of the present disclosure;

[0043] Figure 14 This is a schematic view illustrating an example in which a current collector is mounted on an electrode assembly according to an embodiment of the present disclosure;

[0044] Figure 15 This is a schematic view illustrating an example in which a current collector is mounted on an electrode assembly according to an embodiment of the present disclosure;

[0045] Figure 16 This is a perspective view schematically showing a current collection component according to an embodiment of the present disclosure;

[0046] Figure 17 This is an illustrative example of an embodiment according to the present disclosure. Figure 16 A view of an example of a current collector component disposed on an electrode assembly;

[0047] Figure 18 This is an illustrative example of an embodiment according to the present disclosure. Figure 16 A view of an example of a current collector component disposed on an electrode assembly;

[0048] Figure 19This is a schematic illustration of an example of a coating member being coated on a current collector member according to an embodiment of the present disclosure;

[0049] Figure 20 This is a schematic illustration of an electrode assembly with insulating members provided according to an embodiment of the present disclosure;

[0050] Figure 21 This is a perspective view schematically illustrating an insulating member according to an embodiment of the present disclosure;

[0051] Figure 22 This is a view schematically illustrating an example of a weld line between an uncoated portion and a current collector according to an embodiment of the present disclosure;

[0052] Figure 23 This is a view schematically illustrating an example of a weld line between an uncoated portion and a current collector according to an embodiment of the present disclosure; and

[0053] Figure 24 This is a flowchart illustrating a method for manufacturing a secondary battery according to an embodiment of the present disclosure. Detailed Implementation

[0054] In this document, some exemplary embodiments of the present disclosure will be described in more detail with reference to the accompanying drawings. The terms or words used in this specification and claims should not be construed as limited to their conventional or dictionary meanings, and should be interpreted as having meanings and concepts consistent with the technical ideas of the present disclosure, based on the principle that the inventor is able to appropriately define the concepts of the terms to best describe his or her disclosure. Accordingly, it should be understood that the embodiments described herein and the configurations illustrated in the accompanying drawings are merely some of the embodiments of the present disclosure and do not necessarily represent all the technical ideas of the present disclosure; various equivalents and modifications that can replace the exemplary embodiments may exist at the time of submission of this specification.

[0055] When used herein, the terms “comprising” and / or “including” specify the presence of the mentioned shapes, quantities, steps, operations, components, elements and / or groups thereof, but are not intended to exclude the presence or addition of one or more other shapes, quantities, steps, operations, components, elements and / or groups thereof.

[0056] Additionally, for ease of understanding this disclosure, the drawings may not be drawn to scale, and the dimensions of some components may be exaggerated. Furthermore, the same reference numerals may be assigned to the same components in different embodiments.

[0057] Statements that two objects being compared are “equal” or “identical” mean that they are equal, identical, or substantially identical. Substantially identical can include deviations considered low in the art, such as less than 5%. Additionally, consistency of parameters over a given region can mean consistency from an average perspective.

[0058] Although terms such as "first," "second," etc., may be used to describe various components, these components are not limited by these terms. These terms are used to distinguish one component from another, and unless otherwise specifically stated, it should be understood that a first component can also be a second component.

[0059] Throughout this specification, unless otherwise specifically stated, each element may be singular or plural.

[0060] When any configuration is placed "on (or below)" or "above (or below)" a component, it can mean not only that the configuration is placed in contact with the top (or bottom) of the component, but also that other configurations can be located between the component and any configuration placed on (or below) the component.

[0061] Additionally, when a component is described as being "on" another component, "connected to" or "linked to" another component, these components may be directly connected or linked to each other, but it should be understood that one or more other components may be "between" these components, or these components may be "connected," "linked," or "linked" through another component.

[0062] As used herein, the term “and / or” includes any one and all combinations of one or more of the related listed items. Furthermore, the use of “may” in describing embodiments of this disclosure refers to “one or more embodiments of this disclosure.” Expressions such as “one or more of…” and “at least one of…” following the list of elements modify the entire list of elements, not individual elements in the list.

[0063] Throughout this specification, unless otherwise stated otherwise, "A and / or B" means A, B, or A and B. That is, "and / or" includes any one or all of the listed items. When "C~D" is stated, unless otherwise specifically stated, it means greater than or equal to C and less than or equal to D.

[0064] 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 of A, B and C” or “at least one selected from A, B and C” are used to indicate a list of elements A, B and C, the phrase can refer to any one and all suitable combinations.

[0065] The term “use” may be considered synonymous with the term “utilize”. As used in this specification, the terms “substantially,” “about,” and other similar terms are used as approximate terms and not as terms of degree, and are intended to take into account the inherent variations in measured or calculated values ​​as recognized by those skilled in the art.

[0066] It should be understood that although the terms "first," "second," and "third," etc., may be used herein to describe various elements, components, regions, layers, and / or segments, these elements, components, regions, layers, and / or segments should not be limited by these terms. These terms are used to distinguish one element, component, region, layer, or segment from another element, component, region, layer, or segment. Therefore, without departing from the teachings of the exemplary embodiments, the first element, component, region, layer, or segment discussed below may be referred to as the second element, component, region, layer, or segment.

[0067] For ease of description, spatial relative terms such as “below,” “below,” “down,” “above,” and “up” are used herein to describe the relationship of one element or feature to another element(s) illustrated in the accompanying drawings. It should be understood that spatial relative terms are intended to cover different orientations of the device in use or operation other than those depicted in the accompanying drawings. For example, if an element or feature in the accompanying drawings is inverted, an element described as “below” or “below” becomes “up” or “up.” Thus, the term “below” can encompass both upward and downward directions.

[0068] The terminology used in this specification is intended to describe embodiments of this disclosure and is not intended to limit this disclosure.

[0069] In this specification, the X-axis represents a first direction. For example, the first direction (X-axis) can be electrode 41 (see example...). Figure 4 The thickness direction of the electrode 41. For example, the first direction (X-axis) can be the stacking direction of the electrode 41.

[0070] In this specification, the Y-axis represents a second direction. The second direction (Y-axis) is perpendicular to the first direction (X-axis). For example, the second direction (Y-axis) can be the longitudinal direction of electrode 41. For example, the second direction (Y-axis) can be the direction in which electrode 41 extends.

[0071] In this specification, the Z-axis represents a third direction. The third direction (Z-axis) is perpendicular to the first direction (X-axis) and the second direction (Y-axis). For example, the third direction (Z-axis) can be the width direction of electrode 41.

[0072] Figure 1 This is a perspective view schematically illustrating a secondary battery according to an embodiment of the present disclosure.

[0073] Figure 2This is a schematic view illustrating a secondary battery according to an embodiment of the present disclosure.

[0074] According to an embodiment of the present disclosure, a secondary battery 1 includes: a housing 10; cover plates 21 and 22 connected to the housing 10; and terminals 31 and 32 connected to the cover plates 21 and 22.

[0075] The housing 10 generally forms the appearance of the secondary battery 1 and houses the electrode assembly 40 (see...). Figure 3 ).

[0076] In one embodiment, for example, the housing 10 includes a first short side portion 11, a second short side portion 13, a first long side portion 12, and a second long side portion 14.

[0077] For example, the first short side portion 11 and the second short side portion 13 are configured to face each other in the third direction (Z-axis). For example, the first short side portion 11 and the second short side portion 13 are configured to be parallel to each other.

[0078] In one embodiment, for example, the first short side portion 11 has a generally rectangular plate shape. For example, the second short side portion 13 may be formed corresponding to the shape and / or area of ​​the first short side portion 11. For example, the second short side portion 13 has a generally rectangular plate shape.

[0079] For example, one edge of the first short side portion 11 is connected to one edge of the first long side portion 12. For example, another edge of the first short side portion 11 is connected to one edge of the second long side portion 14. In one embodiment, for example, the first short side portion 11 may have an edge that intersects with each of the first long side portion 12 and the second long side portion 14 to form a curved surface.

[0080] For example, one edge of the second short side portion 13 connects to another edge of the first long side portion 12. For example, another edge of the second short side portion 13 connects to another edge of the second long side portion 14. In one embodiment, for example, the second short side portion 13 may have an edge that intersects with each of the first long side portion 12 and the second long side portion 14 to form a curved surface.

[0081] In one embodiment, the first short side portion 11 may provide an exhaust vent 111. For example, the exhaust vent 111 includes a notch. If the internal pressure of the housing 10 is greater than a reference pressure, the notch ruptures to release gas from inside the housing 10 to the outside.

[0082] For example, the first long side portion 12 has a generally rectangular plate shape. For example, the area of ​​the first long side portion 12 may be larger than the area of ​​the first short side portion 11 and / or the second short side portion 13.

[0083] For example, the second long side portion 14 may be formed in a shape and / or area corresponding to the first long side portion 12. For example, the second long side portion 14 may have a generally rectangular plate shape. For example, the area of ​​the second long side portion 14 may be larger than the area of ​​the first short side portion 11 and / or the second short side portion 13.

[0084] For example, the housing 10 may form openings through a first short side portion 11 and a second short side portion 13, and a first long side portion 12 and a second long side portion 14. These openings can interconnect the interior and exterior spaces of the housing 10. For example, the housing 10 may include a first opening on one side and a second opening on the other side.

[0085] For example, the shell 10 can be formed as a cuboid with one open side and the other open side. For example, the shell 10 can be formed as a rectangular cross-section parallel to the YZ plane.

[0086] In one embodiment, for example, the housing 10 may include any one of stainless steel (e.g., SUS), iron (Fe), carbon steel, etc.

[0087] Cover plates 21 and 22 are attached to housing 10 to seal housing 10. For example, cover plates 21 and 22 are attached to an opening in housing 10. For example, cover plates 21 and 22 can be attached to housing 10 by any of various types of connection methods (such as welding, bolting, mating, etc.).

[0088] For example, cover plates 21 and 22 can be formed into a flat plate shape.

[0089] In one embodiment, for example, the covers 21, 22 comprise the same or similar material as the housing 10. For example, the covers 21, 22 may comprise any of stainless steel (e.g., SUS), iron (Fe), carbon steel, etc. Accordingly, when the covers 21, 22 are joined to the housing 10 by welding, the covers 21, 22 can be easily welded to the housing 10. However, the materials comprised in the covers 21, 22 are not limited thereto. For example, the covers 21, 22 may comprise aluminum (Al).

[0090] Cover plates 21 and 22 include a first cover plate 21 and a second cover plate 22. The first cover plate 21 can be connected to a first opening located on one side of the housing 10. The second cover plate 22 can be connected to a second opening located on the other side of the housing 10.

[0091] Terminals 31 and 32 can protrude outward from the cover plates 21 and 22. Terminals 31 and 32 include a first terminal 31 and a second terminal 32.

[0092] The first terminal 31 is electrically connected to the first electrode 41p (see...) Figure 4For example, the first terminal 31 is inserted into the first cover plate 21. Figure 1 An example is shown where the first terminal 31 has a rectangular cross-sectional shape, but the cross-sectional shape of the first terminal 31 is not limited to this and can have any shape of various kinds, such as any one of a circular shape, an elliptical shape, a polygonal shape, etc. The first terminal 31 can be formed of a conductive material such as aluminum, nickel, copper, etc.

[0093] One side of the first terminal 31 may protrude outward from the first cover plate 21 in the second direction (Y-axis). The other side of the first terminal 31 may extend from the first cover plate 21 into the interior of the housing 10 and may be connected to the first electrode 41p.

[0094] In one embodiment, the secondary battery 1 may further include a first gasket located between the first cover plate 21 and the first terminal 31. The first gasket may electrically insulate the first cover plate 21 from the first terminal 31 and may prevent or substantially prevent the flow of moisture or foreign matter between the first cover plate 21 and the first terminal 31.

[0095] For example, the first gasket can be formed of an insulating material such as polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PET), rubber, etc. For example, the first gasket can be fixed between the first cover plate 21 and the first terminal 31 by extrusion, injection, bonding, etc.

[0096] The second terminal 32 is electrically connected to the second electrode 41n (see...) Figure 4 For example, the second terminal 32 is inserted into the second cover plate 22. Figure 1 An example of a rectangular cross-sectional shape is shown for the second terminal 32, but the cross-sectional shape of the second terminal 32 is not limited to this and can have any shape of various kinds, such as any one of a circular shape, an elliptical shape, a polygonal shape, etc. The second terminal 32 can be formed of a conductive material such as aluminum, nickel, copper, etc.

[0097] One side of the second terminal 32 may protrude outward from the second cover plate 22 in a second direction (Y-axis). For example, the second terminal 32 may protrude in the opposite direction to the direction in which the first terminal 31 protrudes. The other side of the second terminal 32 may extend from the second cover plate 22 into the interior of the housing 10 and may be connected to the second electrode 41n.

[0098] In one embodiment, the secondary battery 1 may further include a second gasket located between the second cover plate 22 and the second terminal 32. The second gasket can electrically insulate the second cover plate 22 from the second terminal 32 and can prevent or substantially prevent the flow of moisture or foreign matter between the second cover plate 22 and the second terminal 32.

[0099] For example, the second gasket can be formed of an insulating material such as polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PET), rubber, etc. For example, the second gasket can be fixed between the second cover plate 22 and the second terminal 32 by extrusion, injection, bonding, etc.

[0100] In one embodiment, for example, at least one of the first cover plate 21 and the second cover plate 22 may further include an electrolyte inlet, into which electrolyte is injected and a sealing cap is installed.

[0101] Figure 3 This is an exploded view schematically illustrating a secondary battery according to an embodiment of the present disclosure.

[0102] Figure 4 This is an exploded view schematically illustrating an electrode assembly according to an embodiment of the present disclosure.

[0103] According to embodiments of the present disclosure, the secondary battery 1 (e.g., regarding...) Figure 1 and Figure 2 The described secondary battery 1) includes an electrode assembly 40 and a current collector 50.

[0104] For example, the secondary battery 1 further includes a housing 10 that accommodates the electrode assembly 40 (e.g., regarding...). Figure 1 and Figure 2 The described housing 10). Figure 3 An exploded view of a secondary battery 1, in which the casing 10 is not shown, is schematically illustrated.

[0105] For example, the secondary battery 1 further includes cover plates 21, 22 connected to the opening of the housing 10. The description of cover plates 21, 22 can be related to... Figure 1 and Figure 2 The descriptions of cover plates 21 and 22 are the same or similar.

[0106] For example, secondary battery 1 includes electrode assembly 40.

[0107] For example, the electrode assembly 40 includes a plurality of electrodes 41 and is formed by stacking the plurality of electrodes 41. The plurality of electrodes 41 includes one or more first electrodes 41p and one or more second electrodes 41n. In one embodiment, for example, the electrode assembly 40 is formed by stacking the first electrodes 41p, the second electrodes 41n, and a diaphragm 42 located between the first electrodes 41p and the second electrodes 41n.

[0108] For example, the electrode assembly 40 may be formed in a stacked configuration in which a plurality of first electrodes 41p, a plurality of second electrodes 41n, and a plurality of diaphragms 42 are sequentially stacked in a first direction (X-axis). However, the electrode assembly 40 is not limited to this configuration. For example, the electrode assembly 400 may be formed as a core shape by winding the first electrodes 41p, second electrodes 41n, and diaphragms 42 clockwise or counterclockwise around a winding axis in a stacked state. In this document, examples of the electrode assembly 40 being formed in a stacked configuration will be described.

[0109] For example, the first electrode 41p can be used as either a positive or negative electrode in the electrode assembly 40. In this document, the case where the first electrode 41p is a positive electrode will be described as an example.

[0110] For example, the second electrode 41n can be used as either the negative or positive electrode of the electrode assembly 40, and has a polarity different from that of the first electrode 41p. In this document, the case where the second electrode 41n is a negative electrode will be described as an example.

[0111] The diaphragm 42 is located between the first electrode 41p and the second electrode 41n. The diaphragm 42 can prevent or substantially prevent the first electrode 41p and the second electrode 41n from contacting each other, and can prevent or substantially prevent short circuits between the second electrode 41p and the first electrode 41n.

[0112] A more detailed description of each component of electrode assembly 40 is provided below.

[0113] Positive electrode active material

[0114] As the positive electrode active material, compounds capable of reversibly inserting and deintercalating lithium (lithiation-intercalated compounds) can be used. In one embodiment, at least one of the composite oxides of lithium and a metal selected from cobalt, manganese, nickel, and combinations thereof can be used.

[0115] The composite oxide can be a lithium transition metal composite oxide, and some examples of it may include lithium nickel-based oxides, lithium cobalt-based oxides, lithium manganese-based oxides, lithium iron phosphate-based compounds, cobalt-free nickel manganese-based oxides, or combinations thereof.

[0116] For example, a compound represented by any of the following chemical formulas can be used: Li a A 1-b X b O 2-c D c (0.90≤a≤1.8, 0≤b≤0.5, 0≤c≤0.05); Li a Mn 2-b X b O 4-c Dc (0.90≤a≤1.8, 0≤b≤0.5, 0≤c≤0.05); Li a Ni 1-b-c Co b X c O 2-α D α (0.90≤a≤1.8, 0≤b≤0.5, 0≤c≤0.5, 0<α<2); Li a Ni 1-b- c Mn b X c O 2-α D α (0.90≤a≤1.8, 0≤b≤0.5, 0≤c≤0.5, 0<α<2); Li a Ni b Co c L 1 d G e O2 (0.90≤a≤1.8, 0≤b≤0.9, 0≤c≤0.5, 0≤d≤0.5, 0≤e≤0.1); Li a NiG b O2 (0.90≤a≤1.8, 0.001≤b≤0.1); Li a CoG b O2 (0.90≤a≤1.8, 0.001≤b≤0.1); Li a Mn 1-b G b O2 (0.90≤a≤1.8, 0.001≤b≤0.1); Li a Mn2G b O4 (0.90≤a≤1.8, 0.001≤b≤0.1); Li a Mn 1-g G g PO4 (0.90≤a≤1.8, 0≤g≤0.5); Li (3-f) Fe2(PO4)3 (0≤f≤2); and Li a FePO4 (0.90≤a≤1.8).

[0117] In the above chemical formulas, A is Ni, Co, Mn, or a combination thereof; X is Al, Ni, Co, Mn, Cr, Fe, Mg, Sr, V, rare earth elements, or a combination thereof; D is O, F, S, P, or a combination thereof; G is Al, Cr, Mn, Fe, Mg, La, Ce, Sr, V, or a combination thereof; and L 1 It is Mn, Al, or a combination thereof.

[0118] As an example, the positive electrode active material can be a high-nickel-based positive electrode active material with a nickel content of 80 mol% or more, 85 mol% or more, 90 mol% or more, 91 mol% or more, or 94 mol% or more and 99 mol% or less per 100 mol% of metals other than lithium in a lithium transition metal composite oxide. High-nickel-based positive electrode active materials can achieve high capacity and are therefore applicable to high-capacity and high-density lithium batteries.

[0119] positive electrode

[0120] The positive electrode for the secondary battery 1 may include a current collector and a positive electrode hybrid layer formed on the current collector. The positive electrode hybrid layer may include a positive electrode active material and may further include a binder and / or a conductive material.

[0121] As an example, the positive electrode may further include additives that can be used as a sacrificial positive electrode.

[0122] In one embodiment, based on a 100 wt% positive electrode mixed layer, the content of the positive electrode active material can be 90 wt% to 99 wt%, and based on a 100 wt% positive electrode mixed layer, the content of each of the binder and conductive material can be 0.5 wt% to 5 wt%.

[0123] The binder can effectively attach the particles constituting the positive electrode active material to each other, and also effectively attach the positive electrode active material to the current collector. Representative examples of binders may include, but are not limited to, polyvinyl alcohol, carboxymethyl cellulose, hydroxypropyl cellulose, diacetyl cellulose, polyvinyl chloride, carboxylated polyvinyl chloride, polyvinyl fluoride, polymers containing ethylene oxide, polyvinylpyrrolidone, polyurethane, polytetrafluoroethylene, polyvinylidene fluoride, polyethylene, polypropylene, styrene-butadiene rubber, (meth)acrylated styrene-butadiene rubber, epoxy resin, (meth)acrylate resin, polyester resin, nylon, etc.

[0124] Conductive materials impart conductivity to electrodes, and any suitable material that does not cause chemical changes and conducts electricity can be used. Examples of conductive materials may include: carbon-based materials, such as natural graphite, artificial graphite, carbon black, acetylene black, Ketjen black, carbon fibers, carbon nanofibers, or carbon nanotubes; metal-based materials in the form of metal powders or metal fibers containing copper, nickel, aluminum, silver, etc.; conductive polymers, such as polyphenylene derivatives; or mixtures thereof.

[0125] In one embodiment, A1 can be used as a current collector, but this disclosure is not limited thereto.

[0126] Negative electrode active material

[0127] The negative electrode active material may include a material capable of reversibly inserting and extracting lithium ions, lithium metal, an alloy of lithium and a metal, a material capable of doping and dedoping lithium, or a transition metal oxide.

[0128] The material capable of reversibly inserting / extracting lithium ions may be a carbon-based negative electrode active material, for example, crystalline carbon, amorphous carbon, or a combination thereof. Examples of crystalline carbon may include graphite, such as natural graphite or artificial graphite that is amorphous, plate-like, flaky, spherical, or fibrous, and examples of amorphous carbon may include soft carbon or hard carbon, mesophase pitch carbide, calcined coke, etc.

[0129] In one embodiment, an alloy of lithium and a metal selected from Na, K, Rb, Cs, Fr, Be, Mg, Ca, Sr, Si, Sb, Pb, In, Zn, Ba, Ra, Ge, Al, and Sn may be used as the alloy of lithium and a metal.

[0130] A Si-based negative electrode active material or a Sn-based negative electrode active material may be used as the material capable of doping and dedoping lithium. The Si-based negative electrode active material may include silicon, a silicon-carbon composite, SiO x (0 < x ≤ 2), a Si-Q alloy (Q is selected from alkali metals, alkaline earth metals, Group 13 elements, Group 14 elements (excluding Si), Group 15 elements, Group 16 elements, transition metals, rare earth elements, and combinations thereof), or a combination thereof. The Sn-based negative electrode active material may be Sn, SnO2, a Sn-based alloy, or a combination thereof.

[0131] The silicon-carbon composite may be a composite of silicon and amorphous carbon. According to one embodiment, the silicon-carbon composite may be in the form of silicon particles coated with amorphous carbon on their surface. For example, the silicon-carbon composite may include secondary particles (cores) in which silicon primary particles are aggregated and an amorphous carbon coating (shell) on the surface of the secondary particles. Amorphous carbon may also be located between the silicon primary particles, and for example, the silicon primary particles may be coated with amorphous carbon. The secondary particles may be dispersed in an amorphous carbon matrix.

[0132] The silicon-carbon composite may further include crystalline carbon. For example, the silicon-carbon composite may include a core containing crystalline carbon and silicon particles and an amorphous carbon coating on the surface of the core.

[0133] The Si-based negative electrode active material or the Sn-based negative electrode active material may be used in combination with the carbon-based negative electrode active material.

[0134] Negative electrode

[0135] The negative electrode for the secondary battery 1 may include a current collector and a negative electrode mixture layer on the current collector. The negative electrode mixture layer may include a negative electrode active material and may further include a binder and / or a conductive material.

[0136] In one embodiment, for example, the negative electrode hybrid layer may include 90 wt% to 99.5 wt% of negative electrode active material, 0.5 wt% to 5 wt% of binder, and 0 wt% to 5 wt% of conductive material.

[0137] The binder can effectively attach the particles constituting the negative electrode active material to each other, and also effectively attach the negative electrode active material to the current collector. The binder can include non-aqueous binders, aqueous binders, dry binders, or combinations thereof.

[0138] Non-aqueous adhesives may include polyvinyl chloride, carboxylated polyvinyl chloride, polyvinyl fluoride, ethylene-propylene copolymer, polystyrene, polyurethane, polytetrafluoroethylene, polyvinylidene fluoride, polyethylene, polypropylene, polyamide-imide, polyimide, or combinations thereof.

[0139] Waterborne adhesives can be selected from styrene-butadiene rubber, (meth)acrylated styrene-butadiene rubber, (meth)acrylonitrile-butadiene rubber, (meth)acrylic rubber, butyl rubber, fluoroelastomers, polyethylene oxide, polyvinylpyrrolidone, polyepoxychloropropane, polyphosphazene, poly(meth)acrylonitrile, ethylene propylene diene copolymer, polyvinylpyridine, chlorosulfonated polyethylene, latex, polyester resin, (meth)acrylic resin, phenolic resin, epoxy resin, polyvinyl alcohol, and combinations thereof.

[0140] If an aqueous binder is used as the negative electrode binder, it may further include a cellulose-based compound capable of imparting viscosity. This cellulose-based compound can be used by mixing one or more of carboxymethyl cellulose, hydroxypropyl methyl cellulose, methyl cellulose, and their alkali metal salts. In one embodiment, Na, K, or Li may be used as the alkali metal.

[0141] Dry adhesives are polymeric materials capable of being fibrous, and can be, for example, polytetrafluoroethylene, polyvinylidene fluoride, polyvinylidene fluoride-hexafluoropropylene copolymer, polyethylene oxide, or combinations thereof.

[0142] Conductive materials impart conductivity to electrodes, and any suitable material that does not cause chemical changes and conducts electricity can be used. Some examples may include: carbon-based materials, such as natural graphite, artificial graphite, carbon black, acetylene black, Ketjen black, carbon fibers, carbon nanofibers, or carbon nanotubes; metal-based materials in the form of metal powders or metal fibers containing copper, nickel, aluminum, silver, etc.; conductive polymers, such as polyphenylene derivatives; or mixtures thereof.

[0143] In one embodiment, the negative electrode current collector may be selected from copper foil, nickel foil, stainless steel foil, titanium foil, nickel foam, copper foam, polymer substrate coated with conductive metal, and combinations thereof.

[0144] diaphragm

[0145] Depending on the type of secondary battery 1, the separator 42 may be present between the first electrode 41p and the second electrode 41n. As the separator, polyethylene, polypropylene, polyvinylidene fluoride, or multilayer membranes of two or more layers thereof can be used, and mixed multilayer membranes such as polyethylene / polypropylene two-layer membranes, polyethylene / polypropylene / polyethylene three-layer membranes, or polyethylene / polypropylene / polypropylene three-layer membranes can be used.

[0146] The diaphragm may include a porous substrate and a coating comprising organic material, inorganic material or a combination thereof on one or two or opposite surfaces of the porous substrate.

[0147] The porous substrate can be a polymer film formed from any polymer selected from polyolefins (such as polyethylene and polypropylene), polyesters (such as polyethylene terephthalate and polybutylene terephthalate), polyacetal, polyamide, polyimide, polycarbonate, polyetherketone, polyaryletherketone, polyetherimide, polyamideimide, polybenzimidazole, polyethersulfone, polyphenylene ether, cyclic olefin copolymers, polyphenylene sulfide, polyethylene naphthalate, glass fiber, and polytetrafluoroethylene (e.g., Teflon), or copolymers or mixtures thereof.

[0148] Organic materials may include polymers such as polyvinylidene fluoride or (meth)acrylic acid polymers.

[0149] Inorganic materials may include, but are not limited to, inorganic particles selected from Al2O3, SiO2, TiO2, SnO2, CeO2, MgO, NiO, CaO, GaO, ZnO, ZrO2, Y2O3, SrTiO3, BaTiO3, Mg(OH)2, boehmite and combinations thereof.

[0150] Organic and inorganic materials can exist as a mixture in a single coating, or they can exist as a stack of coatings containing organic materials and coatings containing inorganic materials.

[0151] electrolyte

[0152] In one embodiment, the electrolyte used for the secondary battery 1 includes a non-aqueous organic solvent and a lithium salt.

[0153] Non-aqueous organic solvents are used as a medium through which ions participating in the electrochemical reactions of the battery can move.

[0154] Non-aqueous organic solvents can be carbonate solvents, ester solvents, ether solvents, ketone solvents, alcohol solvents, aprotic solvents, or combinations thereof.

[0155] Examples of carbonate solvents may include dimethyl carbonate (DMC), diethyl carbonate (DEC), dipropyl carbonate (DPC), methyl propyl carbonate (MPC), ethyl propyl carbonate (EPC), methyl ethyl carbonate (MEC), ethylene carbonate (EC), propylene carbonate (PC), butyl carbonate (BC), etc.

[0156] Examples of ester solvents include methyl acetate, ethyl acetate, n-propyl acetate, dimethyl acetate, methyl propionate, ethyl propionate, decanoic acid lactone, mevalonate lactone, caprolactone, etc.

[0157] Ether solvents can include dibutyl ether, tetraethylene glycol dimethyl ether, diethylene glycol dimethyl ester, dimethoxyethane, 2-methyltetrahydrofuran, 2,5-dimethyltetrahydrofuran, and tetrahydrofuran. Additionally, cyclohexanone and the like can be used as ketone solvents. As alcohol solvents, ethanol, isopropanol, etc., can be used, and as aprotic solvents, nitriles such as R-CN (where R is a straight-chain, branched, or cyclic hydrocarbon group having 2 to 20 carbon atoms, and may include double bonds, aromatic rings, or ether bonds), amides such as dimethylformamide, dioxolane such as 1,3-dioxolane or 1,4-dioxolane, sulfolane, etc., can be used.

[0158] Non-aqueous organic solvents can be used alone or in mixtures of two or more.

[0159] In one embodiment, if a carbonate solvent is used, cyclic carbonates and chain carbonates can be mixed and used, and the cyclic carbonates and chain carbonates can be mixed in a volume ratio of 1:1 to 1:9.

[0160] Lithium salts are substances that can dissolve in organic solvents and serve as a source of lithium ions within batteries, enabling basic operation of lithium batteries and facilitating the movement of lithium ions between the positive and negative electrodes. Representative examples of lithium salts can include those from LiPF6, LiBF4, LiSbF6, LiAsF6, LiClO4, LiAlO2, LiAlCl4, LiPO2F2, LiCl, LiI, LiN(SO3C2F5)2, Li(FSO2)2N (lithium bis(fluorosulfonyl)imide (LiFSI)), LiC4F9SO3, and LiN(C x F 2x+1 SO2)(C y F 2y+1 One or more of the following: (SO2) (x and y are integers from 1 to 20), lithium trifluoromethanesulfonate, lithium tetrafluoroethanesulfonate, lithium difluorobis(oxalate)phosphate (LiDFBOP), and lithium bis(oxalate)borate (LiBOB).

[0161] like Figure 1 and Figure 2As shown, the housing 10 is sealed after receiving the electrode assembly 40 and the electrolyte. For example, the housing 10 is sealed by cover plates 21 and 22.

[0162] The secondary battery 1 includes a current collector 50.

[0163] For example, a current collector 50 is disposed between the electrode assembly 40 and the cover plates 21 and 22. The current collector 50 is electrically connected to the electrode assembly 40. The current collector 50 can collect current from the electrode assembly 40. The current collector 50 is electrically connected to terminals 31 and 32. The current collector 50 can be formed of a conductive material. For example, the current collector 50 can include copper, nickel, aluminum, stainless steel, etc.

[0164] For example, the current collector 50 includes a first current collector 50p and a second current collector 50n.

[0165] For example, the first current collector 50p is electrically connected to the first electrode 41p. For example, the first current collector 50p is connected to the uncoated portion of the first electrode 41p. For example, the first current collector 50p is electrically connected to the first terminal 31.

[0166] For example, the second current collector 50n is electrically connected to the second electrode 41n. For example, the second current collector 50n is connected to the uncoated portion of the second electrode 41n. For example, the second current collector 50n is electrically connected to the second terminal 32.

[0167] In one embodiment, for example, the secondary battery 1 may further include an insulating member 60.

[0168] An insulating member 60 is located between the electrode assembly 40 and the current collector 50. The insulating member 60 is arranged to surround at least one side of the electrode assembly 40. The insulating member 60 can protect the electrode assembly 40. For example, the insulating member 60 protects the diaphragm 42. For example, the insulating member 60 can prevent or substantially prevent damage to the diaphragm 42 when the current collector 50 is engaged with the electrode assembly 40.

[0169] For example, insulating member 60 includes a first insulating member 60p and a second insulating member 60n.

[0170] For example, a first insulating member 60p is located between the electrode assembly 40 and the first current collector 50p. For example, the first insulating member 60p is arranged to surround one side of the electrode assembly 40. For example, the first insulating member 60p can prevent or substantially prevent damage to the diaphragm 42 extending to one side of the electrode assembly 40.

[0171] For example, a second insulating member 60n is located between the electrode assembly 40 and the second current collector 50n. For example, the second insulating member 60n is arranged to surround the other side of the electrode assembly 40. For example, the second insulating member 60n can prevent or substantially prevent damage to the diaphragm 42 extending to the other side of the electrode assembly 40.

[0172] For example, the secondary battery 1 may further include insulating plates 71 and 72.

[0173] In one embodiment, for example, as Figure 3 As shown, insulating plates 71 and 72 are located between cover plates 21 and 22 and current collecting member 50. In one embodiment, for example, with Figure 3 As shown in the diagram, insulating plates 71 and 72 can be located between current collector 50 and electrode assembly 40.

[0174] In one embodiment, for example, the insulating plates 71 and 72 may be formed in a rectangular plate shape, but the shape of the insulating plates 71 and 72 is not limited thereto. In one embodiment, for example, the insulating plates 71 and 72 may include through holes through which the cover plates 21 and 22 and the current collector 50 may be electrically connected.

[0175] For example, insulating plates 71 and 72 allow cover plates 21 and 22 to be insulated except in areas where electrical connections are required. For example, insulating plates 71 and 72 include insulating material. In one embodiment, the insulating material may include, for example, any one of polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PET), rubber, etc.

[0176] For example, insulating plates 71 and 72 include at least one of a first insulating plate 71 and a second insulating plate 72. For example, the first insulating plate 71 is located between the first cover plate 21 and the first current collector 50p. For example, the second insulating plate 72 is located between the second cover plate 22 and the second current collector 50n.

[0177] Figure 5 This is a schematic view illustrating electrodes according to an embodiment of the present disclosure.

[0178] According to embodiments of the present disclosure, the secondary battery 1 (e.g., regarding...) Figures 1 to 3 The described secondary battery 1) includes an electrode assembly 40 (e.g., regarding...). Figures 3 to 4 The described electrode assembly 40) and current collector 50 (e.g., regarding...) Figure 3 The described flow collector component 50).

[0179] The electrode assembly 40 is formed by stacking a plurality of electrodes 41. The electrodes 41 include a first electrode 41p and a second electrode 41n. The description of the electrodes 41 described below can be applied in the same or similar way to the first electrode 41p and / or the second electrode 41n.

[0180] Electrode 41 includes substrate 41a and a hybrid layer 41b formed on a portion of substrate 41a.

[0181] For example, substrate 41a includes Figure 3 and Figure 4 The current collector described herein. For example, if electrode 41 is a positive electrode, then substrate 41a includes a positive electrode current collector. In one embodiment, for example, the positive electrode current collector includes aluminum (Al). For example, if electrode 41 is a negative electrode, then substrate 41a includes a negative electrode current collector. In one embodiment, for example, the negative electrode current collector includes copper (Cu).

[0182] For example, the mixed layer 41b includes an active material. For example, if electrode 41 is a positive electrode, the active material includes a positive electrode active material. For example, the positive electrode active material includes a compound capable of reversibly inserting and de-intercalating lithium (lithiation intercalation compound). For example, if electrode 41 is a negative electrode, the mixed layer 41b includes a negative electrode active material. For example, the negative electrode active material includes a material capable of reversibly inserting / de-intercalating lithium ions, lithium metal, an alloy of lithium and metal, a material capable of doping and de-doping lithium, or a transition metal oxide.

[0183] In one embodiment, for example, the hybrid layer 41b may further comprise a conductive material and / or an adhesive.

[0184] In one embodiment, for example, the mixing layer 41b may be formed in the form of a slurry and coated onto the substrate 41a. In another embodiment, for example, the mixing layer 41b may be formed in the form of a self-supporting film comprising an active material and attached to the substrate 41a.

[0185] For example, the hybrid layer 41b is provided on at least a portion of the substrate 41a. In one embodiment, for example, the hybrid layer 41b is provided on a portion of one surface of the substrate 41a. In another embodiment, for example, the hybrid layer 41b is provided on a portion of both surfaces or opposite surfaces of the substrate 41a. In this case, the area where the hybrid layer 41b is provided on a portion of the substrate 41a may be referred to as hybrid portion a. Additionally, another portion of the substrate 41a, where the hybrid layer 41b is not provided and the substrate 41a is exposed to the outside, may be referred to as uncoated portion n.

[0186] In one embodiment, electrode 41 includes a mixing portion a having a first width w1 and an uncoated portion n having a second width w2 equal to the first width w1 and extending from the mixing portion a.

[0187] For example, electrode 41 is formed in a generally rectangular plate shape. For example, electrode 41 is formed to extend in a second direction (Y-axis). Alternatively, for example, electrode 41 is formed by extending a width in a third direction (Z-axis). In this case, electrode 41 may have a length extending in the second direction (Y-axis) that is equal to or longer than the width extending in the third direction (Z-axis). In this document, the case where electrode 41 has a rectangular plate shape is described as an example, in which the width extending in the third direction (Z-axis) is shorter than the length extending in the second direction (Y-axis), but the shape of electrode 41 is not limited to this.

[0188] Electrode 41 includes a mixed portion a and an uncoated portion n.

[0189] For example, an uncoated portion n is formed on one side of the mixed portion a. Accordingly, the uncoated portion n may extend to one side of the electrode assembly 40.

[0190] In one embodiment, the uncoated portion n is not separately cut to form a terminal block. In this case, the terminal block is a component that electrically connects the electrode 41 and the current collector 50. The uncoated portion n serves as a terminal block as a whole in its uncut state. Since the uncoated portion n is not separately cut, the electrode 41 can be formed to have the same width as the substrate 41a as a whole.

[0191] For example, the blending portion a is formed to have a first width w1. The first width w1 represents the shortest distance between one edge and another edge of the blending portion a in a third direction (Z-axis). In this case, one edge and the other edge of the blending portion a are positioned opposite to each other.

[0192] For example, an uncoated portion n is formed on one side of the mixed portion a and has a second width w2. The second width w2 represents the shortest distance between one edge and another edge of the uncoated portion n in a third direction (Z-axis). In this case, one edge and the other edge of the uncoated portion n are positioned opposite to each other.

[0193] In one embodiment, the second width w2 is the same as the first width w1. In this case, "same" includes values ​​within a range of ±5%. For example, the first width w1 may be formed to be 0.95 to 1.05 times the second width w2.

[0194] In one embodiment, for example, when viewed in the YZ plane, the mixed portion a and the uncoated portion n can be connected to each other to form a rectangular shape. In one embodiment, the electrode 41 can be formed to have a constant width in a third direction (Z-axis).

[0195] If the size of the connecting piece is smaller than the size of the electrode 41, the flow of electrons may be disturbed, potentially leading to resistance. However, according to embodiments of the present disclosure, the electrode 41 can increase its area by utilizing the entire uncoated portion n as the connecting piece. Accordingly, the resistance of the electrode 41 can be reduced, and heat generation can be decreased. Furthermore, according to embodiments of the present disclosure, a separate cutting process for forming the connecting piece is not required. Consequently, the process for forming the electrode 41 is easy and simplified according to embodiments of the present disclosure.

[0196] In this article, Figure 6 The electrode assembly 40 in which electrodes 41 are stacked will be described.

[0197] Figure 6 This is a schematic view illustrating an electrode assembly according to an embodiment of the present disclosure.

[0198] According to embodiments of the present disclosure, the secondary battery 1 (e.g., regarding...) Figures 1 to 3 The described secondary battery 1) includes an electrode assembly 40 (e.g., regarding...). Figures 3 to 4 The described electrode assembly 40) and current collector 50 (e.g., regarding...) Figure 3 The described flow collector component 50).

[0199] The electrode assembly 40 is formed by stacking a plurality of electrodes 41. The plurality of electrodes 41 includes a first electrode 41p and a second electrode 41n (see...). Figure 4 For example, electrode assembly 40 consists of a first electrode 41p, a second electrode 41n, and a diaphragm 42 between the first electrode 41p and the second electrode 41n stacked in a first direction (X-axis) (see...). Figure 4 It is formed by )

[0200] For example, electrode 41 includes a mixing portion a (see Figure 5 The uncoated portion n is formed on one side of the mixed portion a. The uncoated portion n may extend to one side of the electrode assembly 40.

[0201] The first electrode 41p can be arranged such that a first uncoated portion extends to one side of the electrode assembly 40. The second electrode 41n can be arranged such that a second uncoated portion extends to the other side of the electrode assembly 40. The uncoated portions of the first electrode 41p and the second electrode 41n can extend in opposite directions. Accordingly, the first and second uncoated portions in the electrode assembly 40 can be in non-contact with each other.

[0202] As described above, the electrode assembly 40 is formed by stacking a plurality of electrodes 41. Accordingly, a plurality of uncoated portions n are also stacked. For example, a first uncoated portion is stacked and extends to one side of the electrode assembly 40. For example, a second uncoated portion is stacked and extends to the other side of the electrode assembly 40.

[0203] The area in which multiple uncoated portions n are stacked can be referred to as an uncoated portion bundle 411. The electrode assembly 40 includes the uncoated portion bundle 411. In one embodiment, since the first width w1 and the second width w2 are formed to be equal to each other, the uncoated portion bundle 411 can also be formed to have the same width as the portion formed by stacking the mixing portion a.

[0204] For example, the uncoated portion bundle 411 includes a first uncoated portion bundle 411p formed by stacking first uncoated portions and a second uncoated portion bundle 411n formed by stacking second uncoated portions.

[0205] The first uncoated portion bundle 411p may extend to one side of the electrode assembly 40 (e.g., the first side). The second uncoated portion bundle 411n may extend to the other side of the electrode assembly 40 (e.g., the second side). The second uncoated portion bundle 411n may extend in the opposite direction to the direction in which the first uncoated portion bundle 411p extends.

[0206] The contents of the uncoated portion bundle 411 described below can be applied in the same or similar way to the first uncoated portion bundle 411p and the second uncoated portion bundle 411n.

[0207] In one embodiment, for example, the uncoated portion bundle 411 may be formed as a cuboid structure constituting part of the electrode assembly 40. For example, the uncoated portion bundle 411 may be formed as a cuboid structure having one side connected to a portion of the electrode assembly 40 formed by stacking electrodes and extending from that portion of the electrode assembly 40. However, the shape of the uncoated portion bundle 411 is not limited to this, and the uncoated portion bundle 411 may be formed in any suitable form formed by stacking uncoated portions n. In this document, the case where the uncoated portion bundle 411 is formed as a cuboid structure constituting part of the electrode assembly 40 will be described as an example.

[0208] exist Figure 6 In the figure, reference numeral 411f illustrates the front surface of the uncoated portion bundle 411. The front surface 411f is a surface perpendicular to the direction in which the uncoated portion n extends, and refers to the surface formed by stacking the end portions of the uncoated portion n.

[0209] although Figure 6Not shown, but the uncoated portion of bundle 411 includes a rear surface opposite to the front surface 411f. The rear surface connects to the region of the mixed portion stack.

[0210] exist Figure 6 In the figure, reference numeral 4111 indicates the first surface of the uncoated portion of the bundle 411. The first surface 4111 is adjacent to the front surface 411f and extends perpendicularly from the front surface 411f.

[0211] exist Figure 6 In the accompanying drawings, reference numeral 4112 denotes the second surface of the uncoated portion of the bundle 411. The second surface 4112 is adjacent to and extends perpendicularly from the front surface 411f. The second surface 4112 may be arranged parallel to the first surface 4111. The second surface 4112 may be arranged opposite to the first surface 4111.

[0212] The direction from the second surface 4112 toward the first surface 4111 can be parallel to the stacking direction of the electrodes 41. For example, the direction from the second surface 4112 toward the first surface 4111 can be a first direction (X-axis).

[0213] exist Figure 6 In the figure, reference numeral 4113 denotes the third surface of the uncoated portion of bundle 411. The third surface 4113 is adjacent to the front surface 411f and extends perpendicularly from the front surface 411f. The third surface 4113 is adjacent to the first surface 4111 and the second surface 4112, and can extend perpendicularly from each of the first surface 4111 and the second surface 4112.

[0214] exist Figure 6 In the figure, reference numeral 4114 denotes the fourth surface of the uncoated portion of bundle 411. The fourth surface 4114 is adjacent to and extends perpendicularly from the front surface 411f. The fourth surface 4114 is adjacent to the first surface 4111 and the second surface 4112, and may extend perpendicularly from each of the first surface 4111 and the second surface 4112. The fourth surface 4114 may be arranged parallel to the third surface 4113. The fourth surface 4114 may be arranged opposite to the third surface 4113.

[0215] The direction from the third surface 4113 toward the fourth surface 4114 can be parallel to the width direction of the electrode 41. For example, the direction from the third surface 4113 toward the fourth surface 4114 can be a third direction (Z-axis).

[0216] The first surface 4111, the second surface 4112, the third surface 4113, and the fourth surface 4114 can form the appearance of the peripheral surface of the uncoated portion of the bundle 411.

[0217] However, for the convenience of describing the uncoated portion bundle 411, the front surface 411f, rear surface, first surface 4111, second surface 4112, third surface 4113 and fourth surface 4114 can be arbitrarily named, and these names and definitions do not limit the structure or shape of the uncoated portion bundle 411.

[0218] In one embodiment, the uncoated portion bundle 411 can be secured by a strap 41t. The strap 41t can secure the electrode assembly 40. For example, the strap 41t can be attached to at least one side of the uncoated portion bundle 411 to secure the uncoated portion bundle 411.

[0219] The strip 41t may include an insulating material to prevent or substantially prevent short circuits in the electrode assembly 40. In one embodiment, for example, the strip 41t includes an insulating layer comprising an insulating material. In one embodiment, the strip 41t may include an adhesive material bonded to the uncoated portion bundle 411. In one embodiment, for example, the strip 41t includes an insulating layer and an adhesive layer bonding the insulating layer to the uncoated portion bundle 411. The strip 41t can prevent or substantially prevent the electrode assembly 40 from shaking within the housing 10.

[0220] Figure 7 This is a schematic view illustrating a current collection component according to an embodiment of the present disclosure.

[0221] According to embodiments of the present disclosure, the secondary battery 1 (e.g., regarding...) Figures 1 to 3 The described secondary battery 1) includes an electrode assembly 40 (e.g., regarding...). Figures 3 to 4 The described electrode assembly 40) and current collector 50 (e.g., regarding...) Figure 3 The described flow collector component 50).

[0222] The current collector 50 is electrically connected to the electrode assembly 40 by engaging with the uncoated portion bundle 411.

[0223] The current collector 50 is connected to the uncoated portion bundle 411 and simultaneously covers at least two surfaces of the uncoated portion bundle 411. For example, the current collector 50 contacts the front surface 411f of the uncoated portion bundle 411. Additionally, for example, the current collector 50 contacts at least one of the first surface 4111, the second surface 4112, the third surface 4113, and the fourth surface 4114 of the uncoated portion bundle 411.

[0224] For example, the manifold member 50 includes a front surface member 51 and a side surface member 52. Additionally, for example, the manifold member 50 may further include a boss 53.

[0225] For example, the front surface member 51 forms the appearance of one surface of the flow collector member 50. The front surface member 51 may support the boss 53.

[0226] The front surface member 51 is located in the direction in which the uncoated portion n extends. For example, the front surface member 51 contacts the front surface 411f, which is the end portion of the uncoated portion bundle 411. For example, the front surface member 51 is located between the uncoated portion bundle 411 and each of the cover plates 21, 22. For example, the first front surface member included in the first manifold member 50p is located between the first uncoated portion bundle 411p and the first cover plate 21. For example, the second front surface member included in the second manifold member 50n is located between the second uncoated portion bundle 411n and the second cover plate 22.

[0227] In one embodiment, the front surface member 51 may be formed in a shape corresponding to the front surface 411f of the uncoated portion bundle 411. In one embodiment, for example, the front surface 411f of the uncoated portion bundle 411 is formed in a rectangular shape, and the front surface member 51 may be formed in a generally rectangular plate shape. However, the shape of the front surface member 51 is not limited to this, and the front surface member 51 may have any shape of various shapes, such as circular, elliptical, and others. Figure 7 Any of the polygons other than the rectangle shown.

[0228] The front surface member 51 can be formed to have an area corresponding to the area of ​​the front surface 411f of the uncoated portion bundle 411. In one embodiment, for example, the front surface member 51 can be formed to have the same area as the front surface 411f of the uncoated portion bundle 411, or it can be formed to have an area larger than the area of ​​the front surface 411f of the uncoated portion bundle 411. In one embodiment, for example, the size of the front surface member 51 can be formed to be the same as or larger than the size of the front surface 411f of the uncoated portion bundle 411 in a first direction (X-axis). In one embodiment, for example, the size of the front surface member 51 can be formed to be the same as or larger than the size of the front surface 411f of the uncoated portion bundle 411 in a third direction (Z-axis). Accordingly, the front surface member 51 can increase the contact area with the uncoated portion bundle 411 and reduce the resistance. However, in one embodiment, the dimensions of the front surface member 51 may be configured to be smaller in the third direction (Z-axis) than the dimensions of the front surface 411f of the uncoated portion bundle 411.

[0229] A boss 53 may extend from the front surface member 51 and may be connected to terminals 31, 32. The boss 53 contacts the inner surfaces of terminals 31, 32. For example, the boss 53 extends through insulating plates 71, 72 to contact the inner surfaces of terminals 31, 32. In one embodiment, for example, the boss 53 may be electrically connected to terminals 31, 32 by soldering.

[0230] For example, a first boss included in the first current collector 50p extends from the first front surface member toward the first cover plate 21. The first boss can pass through the first insulating plate 71 to connect to the first terminal 31. For example, a second boss included in the second current collector 50n extends from the second front surface member toward the second cover plate 22. The second boss can pass through the second insulating plate 72 to connect to the second terminal 32.

[0231] exist Figure 7 In this illustration, the cross-sectional shape of the boss 53 is shown as circular, but the cross-sectional shape of the boss 53 is not limited to this. For example, the cross-section of the boss 53 can have any shape of various shapes, such as ellipse, polygon, etc.

[0232] For example, the side surface member 52 forms the appearance of the other surfaces of the flow collector member 50.

[0233] Side surface member 52 is connected to front surface member 51 and extends in a direction different from the direction in which front surface member 51 extends. For example, side surface member 52 is connected to front surface member 51 and extends in a direction perpendicular to front surface member 51. For example, side surface member 52 extends from at least one edge of front surface member 51 in a second direction (Y-axis). For example, side surface member 52 extends in the direction in which the uncoated portion n extends.

[0234] The side surface member 52 extends while contacting at least one of the first surface 4111, the second surface 4112, the third surface 4113, and the fourth surface 4114 of the uncoated portion bundle 411. For example, the side surface member 52 may be shaped to contact at least one of the first surface 4111, the second surface 4112, the third surface 4113, and the fourth surface 4114. For example, the side surface member 52 may be shaped as a generally rectangular plate.

[0235] The manifold member 50 includes one or more side surface members 52. For example, if the manifold member 50 includes a front surface member 51 and a side surface member 52, the manifold member 50 can cover two surfaces of the uncoated portion of the bundle 411. For example, if the manifold member 50 includes a front surface member 51 and two side surface members 52, the manifold member 50 can cover three surfaces of the uncoated portion of the bundle 411. For example, if the manifold member 50 includes a front surface member 51 and three or more side surface members 52, the manifold member 50 can cover at least four surfaces of the uncoated portion of the bundle 411.

[0236] Figure 7 An example of a manifold 50 is shown, comprising a front surface member 51 and two side surface members 521, 522. However, the shape and / or application of the manifold 50 are not limited thereto.

[0237] With this structure, the current collector 50 can be connected to the uncoated portion bundle 411 over a large area. In one embodiment, the current collector 50 can be connected to the uncoated portion bundle 411 without utilizing a process of extruding the uncoated portion n, which can reduce the defect rate in manufacturing the secondary battery 1 and improve the reliability of the secondary battery 1.

[0238] Figure 8 This is a view schematically illustrating an example of a current collector being mounted on an electrode assembly according to an embodiment of the present disclosure.

[0239] According to embodiments of the present disclosure, the secondary battery 1 (e.g., regarding...) Figures 1 to 3 The described secondary battery 1) includes: an electrode assembly 40 comprising an uncoated portion bundle 411 (e.g., regarding...). Figure 3 , Figure 4 as well as Figure 6 The described electrode assembly 40); and the current collector 50 connected to the uncoated portion bundle 411 and covering at least two surfaces of the uncoated portion bundle 411 (e.g., regarding...). Figure 3 and Figure 7 The described current collector 50 and electrode assembly 40 each include a hybrid portion a formed having a first width w1 (see [reference]). Figure 5 ) and an uncoated portion n formed having a second width w2 equal to the first width w1 and extending from the mixing portion a (see Figure 5 Multiple electrodes 41 are formed, and uncoated portion bundles 411 are formed by stacking multiple uncoated portions n.

[0240] The current collector 50 is connected to the electrode assembly 40 via a connection to the uncoated portion bundle 411. The current collector 50 connects the electrode assembly 40 and terminals 31, 32 (see...) Figure 3 Electrical connection.

[0241] For example, current collector 50 includes: located on one side of electrode assembly 40 and connected to the first uncoated portion bundle 411p (see... Figure 6 The first current collector 50p (see) Figure 3 ); and located on the other side of the electrode assembly 40 and connected to the second uncoated portion bundle 411n (see Figure 6 The second current collector 50n (see) Figure 3 ).

[0242] For example, the first collector member 50p is located between the first uncoated portion bundle 411p and the first cover plate 21 (see...). Figure 3 Between. The first current collector 50p can electrically connect the first terminal 31 and the first electrode 41p (see Figure 4 ).

[0243] For example, the second current collector 50n is located between the second uncoated portion bundle 411n and the second cover plate 22 (see...). Figure 3 The second current collector 50n can be electrically connected to the second terminal 32 and the second electrode 41n (see...). Figure 4 ).

[0244] For example, such as Figure 8 As shown, the uncoated portion bundle 411 is configured to be inserted into the current collector 50. Accordingly, the current collector 50 can be coupled to the uncoated portion bundle 411. Furthermore, the current collector 50 can be fixed to the electrode assembly 40.

[0245] The current collector 50 can contact the uncoated portion of the bundle 411 while simultaneously covering at least two surfaces of the uncoated portion of the bundle 411. In one embodiment, for example, refer to... Figures 6 to 8 The collector member 50 includes a front surface member 51 that contacts the front surface 411f of the uncoated portion bundle 411 and a side surface member 52 that contacts at least one of the first surface 4111 to the fourth surface 4114 of the uncoated portion bundle 411. Accordingly, the collector member 50 can be connected to the uncoated portion bundle 411 even if the uncoated portion n is not individually compressed.

[0246] In one embodiment, for example, when viewed in a third direction (Z-axis), the current collector 50 may be formed in a C-shape. The uncoated portion of the bundle 411 may be inserted into the recessed portion of the C-shape and connected to the current collector 50. However, the manner in which the electrode assembly 40 and the current collector 50 are connected is not limited to this, and will be discussed below regarding... Figure 7 as well as Figures 9 to 11 An example describing the shape of the current collector 50 in more detail.

[0247] For example, the current collector 50 is positioned in the direction of the electrode 41 stacking with respect to the diaphragm 42 (see Figure 4 In one embodiment, the electrodes 41 are stacked in a first direction (X-axis), and the current collector 50 is configured not to overlap with the diaphragm 42 in the first direction (X-axis).

[0248] For example, in the first direction (X-axis), the current collector 50 includes a side surface member 52 that overlaps with the uncoated portion bundle 411. In this case, in the first direction (X-axis), the side surface member 52 may overlap with the uncoated portion bundle 411 but may not overlap with the diaphragm 42. Accordingly, the current collector 50 can prevent or substantially prevent damage to the diaphragm 42 in the process connected to the uncoated portion n.

[0249] As described above, the secondary battery 1 according to an embodiment of the present disclosure includes: an uncoated portion bundle 411 formed by stacking uncut uncoated portions n; and a current collector 50 that can be connected to the uncoated portion bundle 411 over a large area. Accordingly, in one or more embodiments of the present disclosure, the secondary battery 1 is able to reduce resistance due to the flow of electrons and improve defect problems caused by the lack of welding between the uncoated portions and the current collector.

[0250] Figure 9 This is a schematic view illustrating a current collection component according to an embodiment of the present disclosure.

[0251] According to embodiments of the present disclosure, the secondary battery 1 (e.g., regarding...) Figures 1 to 3 The described secondary battery 1) includes an electrode assembly 40 (e.g., regarding...). Figure 3 , Figure 4 , Figure 6 and Figure 8 The described electrode assembly 40) and current collector 50 (e.g., regarding...) Figure 3 , Figure 7 and Figure 8 The described flow collector component 50).

[0252] For example, refer to Figure 6 , Figure 7 and Figure 9 The flow collector 50 includes: a front surface member 51 located in the direction extending from the uncoated portion n and in contact with the front surface, which is the end portion of the uncoated portion bundle 411; and a side surface member 52 connected to the front surface member 51 and extending in a direction perpendicular to the front surface member 51.

[0253] For example, side surface member 52 includes a first member (also referred to as first side surface member) 521.

[0254] For example, the first member 521 is connected to the front surface member 51 and extends in a direction perpendicular to the front surface member 51. For example, the first member 521 extends in a second direction (Y-axis). For example, the first member 521 extends parallel to the uncoated portion n.

[0255] For example, the first member 521 is positioned facing the first surface 4111 of the uncoated portion of the bundle 411 (see...). Figure 6 For example, the first member 521 is in contact with the first surface 4111. For example, the inner surface of the first member 521 covers at least a portion of the first surface 4111.

[0256] Accordingly, when viewed in a third direction (Z-axis), the flow collector 50 can be formed as Shape. The current collector 50 can be connected to the uncoated portion of the bundle 411 and simultaneously cover the front surface 411f of the uncoated portion of the bundle 411 (see figure). Figure 6 ) and the first surface 4111.

[0257] For example, side surface member 52 includes a second member (also referred to as second side surface member) 522.

[0258] For example, the second member 522 is connected to the front surface member 51 and extends in a direction perpendicular to the front surface member 51. For example, the second member 522 extends in a second direction (Y-axis). For example, the second member 522 extends parallel to the uncoated portion n.

[0259] For example, the second member 522 is positioned facing the second surface 4112 of the uncoated portion of the bundle 411 (see...). Figure 6 For example, the second member 522 is in contact with the second surface 4112. For example, the inner surface of the second member 522 covers at least a portion of the second surface 4112.

[0260] Accordingly, when viewed in the third direction (Z-axis), the current collector 50 can be formed in an L-shape. The current collector 50 can be connected to the uncoated portion bundle 411 and simultaneously cover the front surface 411f and the second surface 4112 of the uncoated portion bundle 411.

[0261] For example, the side surface member 52 includes a first member 521 and a second member 522.

[0262] For example, the first member 521 may extend perpendicularly from one edge of the front surface member 51. Additionally, for example, the second member 522 may extend perpendicularly from the other edge of the front surface member 51. In this case, one edge and the other edge of the front surface member 51 can be positioned opposite to each other. Furthermore, the second member 522 may be located in a direction opposite to that of the first member 521.

[0263] Accordingly, such as Figure 7 and Figure 9 As shown, when viewed in the third direction (Z-axis), the current collector 50 can be formed in a C-shape. The current collector 50 can be connected to the uncoated portion bundle 411 and simultaneously cover the front surface 411f, the first surface 4111, and the second surface 4112 of the uncoated portion bundle 411.

[0264] At least one of the first member 521 and the second member 522 may be formed as one or more plates extending from the front surface member 51.

[0265] For example, such as Figure 7 As shown, each side surface member 52 can be formed as a plate extending from the front surface member 51.

[0266] For example, the side surface member 52 can be formed as a rectangular plate. However, the shape of the side surface member 52 is not limited to this, and the side surface member 52 can have any suitable shape, as long as it is in the form of a plate extending from the front surface member 51.

[0267] In one embodiment, for example, one edge of the side surface member 52 is connected to one edge of the front surface member 51. In this case, the length of the edge of the side surface member 52 may correspond to (e.g., be equal to) the length of the edge of the front surface member 51. In one embodiment, the side surface member 52 may be formed to have a constant width in the third direction (Z-axis). In one embodiment, the side surface member 52 may be formed to be a rectangular plate with a width equal to the length of the edge of the front surface member 51 in the third direction (Z-axis).

[0268] For example, the first member 521 can be formed in the form of a rectangular plate and extend perpendicularly from one edge of the front surface member 51. For example, the second member 522 can be formed in the form of a rectangular plate and extend perpendicularly from the other edge of the front surface member 51. In this case, one edge and the other edge of the front surface member 51 are located in opposite directions in the first direction (X-axis).

[0269] Accordingly, the current collector 50 includes a side surface member 52 formed with a large area. The current collector 50 can contact the uncoated portion of the bundle 411 over a large area.

[0270] For example, such as Figure 9 As shown, each side surface member 52 is formed in the form of a plurality of plates extending from the front surface member 51.

[0271] For example, the side surface member 52 can be formed in the form of multiple rectangular plates. However, the shape of the side surface member 52 is not limited to this, and the side surface member 52 can have any suitable shape, as long as it is in the form of multiple plates extending from the front surface member 51.

[0272] For example, the edge of the side surface member 52 is connected to the edge of the front surface member 51. In this case, the length of the edge of each side surface member 52 connected to the front surface member 51 may be shorter than the length of the edge of the front surface member 51 connected to the corresponding side surface member 52. For example, multiple side surface members 52 may be spaced apart from each other and connected to the edge of the front surface member 51.

[0273] For example, the first member 521 can be formed as a plurality of rectangular plates spaced apart from each other, and can extend perpendicularly from one edge of the front surface member 51. For example, the second member 522 can be formed as a plurality of rectangular plates spaced apart from each other, and can extend perpendicularly from the other edge of the front surface member 51. In this case, one edge and the other edge of the front surface member 51 are located in opposite directions in the first direction (X-axis).

[0274] In this case, the number of side surface members 52 connected to one edge of the front surface member 51 can be two or more. For example, as Figure 9 As shown, the first member 521 and the second member 522 can each be formed as three plates. However, the number of side surface members 52 is not limited to this.

[0275] Thus, the current collector 50 includes a plurality of side surface members 52 formed with small areas. The side surface members 52 can be more easily bent or folded from the front surface member 51. The current collector 50 can be in close contact with the uncoated portion of the bundle 411.

[0276] Figure 10 This is a schematic view illustrating a current collection component according to an embodiment of the present disclosure.

[0277] Figure 11 This is a schematic view illustrating a current collection component according to an embodiment of the present disclosure.

[0278] According to embodiments of the present disclosure, the secondary battery 1 (e.g., regarding...) Figures 1 to 3 The described secondary battery 1) includes an electrode assembly 40 (e.g., regarding...). Figure 3 , Figure 4 , Figure 6 and Figure 8 The electrode assembly 40 and the current collector 50 are described.

[0279] For example, the flow collector 50 includes: located in the uncoated portion n (see...) Figure 6 ) extending in the direction and as the uncoated portion of bundle 411 (see Figure 6 The front surface member 51 is in contact with the front surface of the end portion of the front surface member 51; and the side surface member 52 is connected to the front surface member 51 and extends in a direction perpendicular to the front surface member 51.

[0280] For example, side surface member 52 includes a third member (also referred to as third side surface member) 523.

[0281] For example, the third member 523 is connected to the front surface member 51 and extends in a direction perpendicular to the front surface member 51. For example, the third member 523 extends in a second direction (Y-axis).

[0282] For example, the third member 523 is positioned as the third surface 4113 facing the stacked surface of the uncoated portion n of the uncoated portion bundle 411 (see...). Figure 6 For example, the third member 523 is in contact with the third surface 4113. For example, the inner surface of the third member 523 covers at least a portion of the third surface 4113.

[0283] Accordingly, when viewed in the first direction (X-axis), the flow collector 50 can be formed as Shape. The current collector 50 can be connected to the uncoated portion of the bundle 411 and simultaneously cover the front surface 411f of the uncoated portion of the bundle 411 (see figure). Figure 6 ) and the third surface 4113.

[0284] For example, side surface member 52 includes a fourth member (also referred to as fourth side surface member) 524.

[0285] For example, the fourth member 524 is connected to the front surface member 51 and extends in a direction perpendicular to the front surface member 51. For example, the fourth member 524 extends in a second direction (Y-axis).

[0286] For example, the fourth member 524 is positioned facing the fourth surface 4114 of the uncoated portion bundle 411 (see...). Figure 6 For example, the fourth member 524 is in contact with the fourth surface 4114. For example, the inner surface of the fourth member 524 covers at least a portion of the fourth surface 4114.

[0287] Accordingly, when viewed in the first direction (X-axis), the current collector 50 can be formed in an L-shape. The current collector 50 can be connected to the uncoated portion bundle 411 and simultaneously cover the front surface 411f and the fourth surface 4114 of the uncoated portion bundle 411.

[0288] For example, the side surface member 52 includes a third member 523 and a fourth member 524.

[0289] For example, the third member 523 may extend perpendicularly from one edge of the front surface member 51. Additionally, for example, the fourth member 524 may extend perpendicularly from the other edge of the front surface member 51. In this case, one edge and the other edge of the front surface member 51 may be positioned opposite to each other. Furthermore, the fourth member 524 may be located in a direction opposite to that of the third member 523.

[0290] Accordingly, such as Figure 10 and Figure 11As shown, when viewed in the first direction (X-axis), the current collector 50 can be formed in a C-shape. The current collector 50 can be connected to the uncoated portion bundle 411 and simultaneously cover the front surface 411f, the third surface 4113, and the fourth surface 4114 of the uncoated portion bundle 411.

[0291] At least one of the third member 523 and the fourth member 524 may be formed as one or more plates extending from the front surface member 51.

[0292] For example, such as Figure 10 As shown, each side surface member 52 is formed as a plate extending from the front surface member 51.

[0293] For example, the side surface member 52 can be formed as a rectangular plate. However, the shape of the side surface member 52 is not limited to this, and the side surface member 52 can have any suitable shape, as long as it is in the form of a plate extending from the front surface member 51.

[0294] In one embodiment, for example, the edge of the side surface member 52 is connected to the edge of the front surface member 51. In this case, the length of the edge of the side surface member 52 may correspond to (e.g., be equal to) the length of the edge of the front surface member 51. In one embodiment, the side surface member 52 may be formed to have a constant width in the first direction (X-axis). In the first direction (X-axis), the side surface member 52 may be formed as a rectangular plate having a width equal to the length of one edge of the front surface member 51.

[0295] For example, the third member 523 can be formed in the form of a rectangular plate and extend perpendicularly from one edge of the front surface member 51. For example, the fourth member 524 can be formed in the form of a rectangular plate and extend perpendicularly from the other edge of the front surface member 51. In this case, one edge and the other edge of the front surface member 51 are located in opposite directions in the third direction (Z-axis).

[0296] Accordingly, the current collector 50 includes a side surface member 52 formed with a large area. The current collector 50 can contact the uncoated portion of the bundle 411 over a large area.

[0297] In one embodiment, for example, as Figure 11 As shown, each side surface member 52 is formed in the form of a plurality of plates extending from the front surface member 51.

[0298] For example, the side surface member 52 can be formed in the form of multiple rectangular plates. However, the shape of the side surface member 52 is not limited to this, and the side surface member 52 can have any suitable shape, as long as it is in the form of multiple plates extending from the front surface member 51.

[0299] For example, the edge of the side surface member 52 is connected to the edge of the front surface member 51. In this case, the length of the edge of each side surface member 52 connected to the front surface member 51 may be shorter than the length of an edge of the front surface member 51 connected to the corresponding side surface member 52. For example, multiple side surface members 52 may be spaced apart from each other and connected to an edge of the front surface member 51.

[0300] For example, the third member 523 can be formed as a plurality of rectangular plates spaced apart from each other, and can extend perpendicularly from one edge of the front surface member 51. For example, the fourth member 524 can be formed as a plurality of rectangular plates spaced apart from each other, and can extend perpendicularly from another edge of the front surface member 51. In this case, one edge and the other edge of the front surface member 51 are located in opposite directions in the third direction (Z-axis).

[0301] In one embodiment, the number of side surface members 52 connected to one edge of the front surface member 51 may be two or more. For example, such as Figure 11 As shown, the third member 523 and the fourth member 524 can each be formed as three plates. However, the number of side surface members 52 is not limited to this.

[0302] Thus, the current collector 50 includes a plurality of side surface members 52 formed with small areas. The side surface members 52 can be more easily bent or folded from the front surface member 51. The current collector 50 can be in close contact with the uncoated portion of the bundle 411.

[0303] Figure 12 This is a schematic view illustrating a current collection component according to an embodiment of the present disclosure.

[0304] Figure 13 This is a schematic view illustrating a current collection component according to an embodiment of the present disclosure.

[0305] According to embodiments of the present disclosure, the secondary battery 1 (e.g., regarding...) Figures 1 to 3 The described secondary battery 1) includes an electrode assembly 40 (e.g., regarding...). Figure 3 , Figure 4 , Figure 6 and Figure 8 The electrode assembly 40 and the current collector 50 are described.

[0306] For example, the flow collector 50 includes: located in the uncoated portion n (see...) Figure 6 ) extending in the direction and as the uncoated portion of bundle 411 (see Figure 6 The front surface member 51 is in contact with the front surface of the end portion of the front surface member 51; and the side surface member 52 is connected to the front surface member 51 and extends in a direction perpendicular to the front surface member 51.

[0307] For example, side surface member 52 includes: a first member (also referred to as a first side surface member) 521, connected to front surface member 51, extending in a direction perpendicular to front surface member 51, extending parallel to uncoated portion 411, and connected to the first surface 4111 of uncoated portion bundle 411 (see...). Figure 6 ) contact; the second member (also referred to as the second side surface member) 522, connected to the front surface member 51, extends in a direction perpendicular to the front surface member 51, and contacts the second surface 4112 located in a direction opposite to the first surface 4111 (see Figure 6 ) in contact; a third member (also referred to as the third side surface member) 523, connected to the front surface member 51, extending in a direction perpendicular to the front surface member 51, and in contact with the third surface 4113 of the uncoated portion bundle 411 as the stacked surface of the uncoated portion n (see Figure 6 ) contact; and a fourth member (also referred to as the fourth side surface member) 524, connected to the front surface member 51, extending in a direction perpendicular to the front surface member 51, and in contact with the fourth surface 4114 located in the opposite direction to the third surface 4113 (see Figure 6 )touch.

[0308] For example, a third surface 4113 is positioned adjacent to each of the first surface 4111 and the second surface 4112. For example, a fourth surface 4114 is positioned adjacent to each of the first surface 4111 and the second surface 4112.

[0309] Accordingly, such as Figure 12 and 13 As shown, when viewed in the second direction (Y-axis), the current collector 50 can be formed as a □ shape or a □ shape formed by dashed lines. The current collector 50 can be coupled to the uncoated portion of the bundle 411 while covering the front surface 411f of the uncoated portion of the bundle 411 (see Figure 1). Figure 6 ), first surface 4111, second surface 4112, third surface 4113 and fourth surface 4114.

[0310] At least one of the first member 521 to the fourth member 524 may be formed as one or more plates extending from the front surface member 51.

[0311] For example, such as Figure 12 As shown, each side surface member 52 is formed as a plate extending from the front surface member 51. A description of the side surface member 52 formed as a plate can be found in the reference... Figure 7 and Figure 10The description is the same or similar. In one embodiment, the current collector 50 includes a side surface member 52 formed to have as large an area as possible. The current collector 50 can contact the uncoated portion of the bundle 411 over a larger area.

[0312] For example, such as Figure 13 As shown, each side surface member 52 is formed as a plurality of plates extending from the front surface member 51. A description of the side surface members 52 formed as a plurality of plates can be found in the reference. Figure 9 and Figure 11 The descriptions are the same or similar. In one embodiment, the manifold 50 includes a plurality of side surface members 52 formed with the smallest possible area. The side surface members 52 can be more easily bent or folded from the front surface member 51. The manifold 50 can make closer contact with the uncoated portion bundle 411.

[0313] Already referenced Figure 7 as well as Figures 9 to 13 Various shapes of the current collector 50 are described. However, Figure 7 as well as Figures 9 to 13 The embodiments shown are merely some examples of the current collection component 50. As mentioned above, besides Figure 7 as well as Figures 9 to 13 Besides the shape shown, other shapes of the current collector 50 can also be applied. In this document, methods for positioning the current collector 50 relative to the electrode assembly 40 will be described with reference to some examples.

[0314] Figure 14 This is a schematic view illustrating an example in which a current collector component according to an embodiment of the present disclosure is mounted on an electrode assembly.

[0315] Figure 15 This is a schematic view illustrating an example in which a current collector component according to an embodiment of the present disclosure is mounted on an electrode assembly.

[0316] According to embodiments of the present disclosure, the secondary battery 1 (e.g., regarding...) Figures 1 to 3 The described secondary battery 1) includes an electrode assembly 40 (e.g., regarding...). Figure 3 , Figure 4 , Figure 6 and Figure 8 The described electrode assembly 40) and current collector 50 (e.g., regarding...) Figure 7 The described flow collector component 50).

[0317] Electrode assembly 40 includes an uncoated portion bundle 411. In one embodiment, current collector 50 is coupled to electrode assembly 40 and simultaneously covers at least two or more surfaces of the uncoated portion bundle 411. In one embodiment, current collector 50 includes a front surface member 51 in contact with a surface of the uncoated portion bundle 411 and a side surface member 52 in contact with at least one surface of the uncoated portion bundle 411.

[0318] For example, the side surface member 52 extends away from the front surface 411f parallel to the XZ plane. Additionally, the side surface member 52 includes at least one of a first member 521, a second member 522, a third member 523, and a fourth member 524. In one embodiment, for example, the side surface member 52 may not include the first member 521 and / or the second member 522 located in the first direction (X-axis). In this case, the side surface member 52 may be open in the first direction (X-axis). In one embodiment, for example, the side surface member 52 may not include the third member 523 and / or the fourth member 524 located in the third direction (Z-axis). In this case, the side surface member 52 may be open in the third direction (Z-axis).

[0319] In one embodiment, the current collector 50 can be fixed to the electrode assembly 40 by sliding.

[0320] In one embodiment, for example, the current collector 50 is configured to be spaced apart from the uncoated portion bundle 411 for connection to the uncoated portion bundle 411.

[0321] In one embodiment, for example, the current collector 50 is configured such that the extended surface of the front surface 411f of the uncoated portion of the bundle 411 is parallel to the extended surface of the front surface member 51. Taking into account the opening direction of the side surface member 52, the front surface member 51 may be disposed on the surface extending from the front surface 411f. In one embodiment, for example, the side surface member 52 is open in a third direction (Z-axis). In this case, the front surface member 51 may be disposed on the surface extending from the front surface 411f in the third direction (Z-axis). In one embodiment, for example, the side surface member 52 is open in a first direction (X-axis). In this case, the front surface member 51 may be disposed on the surface extending from the front surface 411f in the first direction (X-axis).

[0322] For example, the collector member 50 can slide toward the uncoated portion bundle 411 such that the front surface member 51 and the front surface 411f face each other. For example, the front surface member 51 can contact the front surface 411f. With the front surface member 51 and the front surface 411f facing each other, the side surface member 52 is thus configured to face each other with at least one of the first surface 4111 to the fourth surface 4114.

[0323] Accordingly, the current collector 50 can be easily connected to the uncoated portion bundle 411 while covering at least two or more surfaces of the uncoated portion bundle 411.

[0324] In one embodiment, for example, as Figure 14 As shown, the side surface member 52 includes a first member 521 and a second member 522. For example, the side surface member 52 does not include a third member 523 and / or a fourth member 524, and is therefore open in a third direction (Z-axis). In one embodiment, for example, the side surface member 52 may include a third member 523 and / or a fourth member 524 extending in the same direction as the front surface member 51, and is therefore open in a third direction (Z-axis).

[0325] For example, the manifold member 50 can be configured such that the front surface member 51 is located on the surface of the front surface 411f extending in the third direction (Z-axis). The manifold member 50 can slide (move) toward the uncoated portion bundle 411 in the third direction (Z-axis). For example, the manifold member 50 can... Figure 15 It slides along direction A and connects to the uncoated portion of bundle 411.

[0326] In one embodiment, for example, as Figure 15 As shown, the side surface member 52 includes a third member 523 and a fourth member 524. For example, the side surface member 52 does not include the first member 521 and / or the second member 522, and therefore can be open in the first direction (X-axis). In one embodiment, for example, the side surface member 52 may include a first member 521 and / or a second member 522 extending in the same direction as the front surface member 51, and therefore can be open in the first direction (X-axis).

[0327] For example, the flow collector 50 can be configured such that the front surface member 51 is located on the surface of the front surface 411f extending in the first direction (X-axis). The flow collector 50 can slide (move) toward the uncoated portion bundle 411 in the first direction (X-axis). For example, the flow collector 50 can... Figure 15 It slides along direction B and connects to the uncoated portion of bundle 411.

[0328] In this way, the current collector 50 can be easily connected to the electrode assembly 40. For example, the current collector 50 can slide toward and connect to the electrode assembly 40 in various directions.

[0329] Figure 16 This is a perspective view schematically illustrating a current collection component according to an embodiment of the present disclosure.

[0330] Figure 17 This is an illustrative example of an embodiment according to the present disclosure. Figure 16 A view of an example of a current collector component set on an electrode assembly.

[0331] Figure 18 This is an illustrative example of an embodiment according to the present disclosure. Figure 16 A view of an example of a current collector component set on an electrode assembly.

[0332] According to embodiments of the present disclosure, the secondary battery 1 (e.g., regarding...) Figures 1 to 3 The described secondary battery 1) includes an electrode assembly 40 (e.g., regarding 3, Figure 4 , Figure 6 , Figure 8 , Figure 14 and Figure 15 The electrode assembly 40 and the current collector 50 are described.

[0333] The side surface member 52 extends from the collector member 50 in different directions. For example, the side surface member 52 extends perpendicularly from the collector member 50.

[0334] The flow collector 50 can be formed by injection molding, such that the side surface member 52 extends in a direction perpendicular to the front surface member 51. For example... Figure 14 and 15 As shown, the current collector 50 can be slidably connected to the electrode assembly 40.

[0335] In one embodiment, the flow collector 50 can be formed by injection molding, such that the side surface member 52 extends while forming an obtuse angle with the front surface member 51. Figure 16 In this context, angle θ represents the angle between the side surface member 52 and the front surface member 51. In one embodiment, the angle θ between the side surface member 52 and the front surface member 51 forms an obtuse angle, such that θ is greater than 90°. For example, the angle θ between the side surface member 52 and the front surface member 51 can be greater than 90° and less than 180°. Figure 16 An example is shown in which the side surface member 52 and the front surface member 51 form an obtuse angle.

[0336] In one embodiment, for example, the side surface member 52 may be bent relative to the front surface member 51 to extend in a direction perpendicular to the front surface member 51. For example, the side surface member 52 may be bent under pressure in a direction perpendicular to the front surface member 51. (See also: Regarding...) Figure 14 and 15 As described above, the current collector 50, which is bent by the side surface member 52, can be slidably connected to the electrode assembly 40.

[0337] In one embodiment, for example, as Figure 17 and 18As shown, the front surface member 51 is configured to face the front surface 411f (see example...). Figure 6 For example, the front surface member 51 is configured to contact the front surface 411f. In one embodiment, when the current collector 50 moves to the uncoated portion bundle 411, the side surface member 52 can be bent toward the uncoated portion bundle 411. For example, the side surface member 52 can be rolled and bent while receiving a force toward the uncoated portion bundle 411 (e.g., while receiving a force in the P direction). Accordingly, the side surface member 52 can be formed to have an angle θ of approximately 90° with the front surface member 51. Accordingly, the current collector 50 can be coupled to the electrode assembly 40.

[0338] In one embodiment, for example, the flow collector 50 includes a bent portion 54 with a groove formed at the boundary between the front surface member 51 and the side surface member 52. For example, the bent portion 54 includes a V-shaped bent portion 54. The side surface member 52 can be bent more easily relative to the front surface member 51 by means of the bent portion 54.

[0339] However, the shape of the bent portion 54 is not limited to this. The bent portion 54 can be formed into any suitable shape that facilitates the extension of the side surface member 52 relative to the front surface member 51 in different directions. The bent portion 54 can be formed into a groove of any shape (such as a U-shape) of various shapes. In addition, the bent portion 54 can be formed to have a thinner thickness by roll forming, or it can be partially formed from different materials that are easy to bend.

[0340] In one embodiment, the bend 54 may be formed between the front surface member 51 and all the side surface members 52. In another embodiment, the bend 54 may be formed only in a portion between the front surface member 51 and the side surface members 52.

[0341] In one embodiment, for example, the side surface member 52 includes a first member 521 and a second member 522 (see example). Figure 7 and Figure 9 In this case, for example, the bent portion 54 is formed at the boundary between the front surface member 51 and at least one of the first member 521 and the second member 522.

[0342] In one embodiment, for example, the side surface member 52 includes a third member 523 and a fourth member 524 (see example). Figure 10 and Figure 11 In this case, for example, the bent portion 54 is formed at the boundary between the front surface member 51 and at least one of the third member 523 and the fourth member 524.

[0343] In one embodiment, for example, the side surface member 52 includes a first member 521, a second member 522, a third member 523, and a fourth member 524 (see example). Figure 12 and Figure 13 In this case, for example, a bent portion 54 is formed at the boundary between the front surface member 51 and at least one of the first member 521, the second member 522, the third member 523 and the fourth member 524.

[0344] In this way, the current collector 50 can come into close contact with the uncoated portion of the bundle 411 through rolling.

[0345] Figure 19 This is a schematic view illustrating an example in which a coating member according to an embodiment of the present disclosure is coated on a manifold member.

[0346] According to embodiments of the present disclosure, the secondary battery 1 (e.g., regarding...) Figures 1 to 3 The described secondary battery 1) includes an electrode assembly 40 (e.g., regarding...). Figure 3 , Figure 4 , Figure 6 , Figure 8 , Figure 14 , Figure 15 , Figure 17 and Figure 18 The described electrode assembly 40) and current collector 50 (e.g., regarding...) Figure 3 as well as Figures 7 to 18 The described flow collector component 50).

[0347] exist Figures 14 to 18 Various examples of how the current collector 50 can be connected to the electrode assembly 40 have been described. Figure 19 The text will describe methods to make such connections easier and / or more robust.

[0348] For example, such as Figure 19 As shown, the secondary battery 1 further includes a coating member 80, which is coated on the current collector 50 to reduce friction between the current collector 50 and the uncoated portion of the bundle 411.

[0349] The coating member 80 can reduce friction between the manifold member 50 and the uncoated portion bundle 411 and / or improve wear resistance. Accordingly, the coating member 80 allows the manifold member 50 to move more smoothly relative to the uncoated portion bundle 411. In addition, during the process of placing the manifold member 50 on the uncoated portion bundle 411, the coating member 80 minimizes or reduces damage to the uncoated portion bundle 411.

[0350] The inner surface of the current collector 50 is coated with a coating member 80. For example, the side of the current collector 50 facing the uncoated portion 411 is coated with the coating member 80. In one embodiment, for example, as... Figure 19 As shown, the entire inner surface of the manifold 50 may be coated with the coating member 80. In one embodiment, for example, a portion of the inner surface of the manifold 50 may be coated with the coating member 80. In one embodiment, either the front surface member 51 or the side surface member 52 may be coated with the coating member 80. In one embodiment, a portion of each of the front surface member 51 and the side surface member 52 may be coated with the coating member 80.

[0351] In one embodiment, the inner surface of the manifold 50 can be coated by applying a coating member 80. However, the method of coating the manifold 50 with the coating member 80 is not limited to this; for example, the coating member 80 can be formed in the form of a strip and attached to the inner surface of the manifold 50.

[0352] In one embodiment, for example, the coated member 80 comprises a low-friction material. In one embodiment, for example, the low-friction material comprises at least one selected from ethylene-chlorotrifluoroethylene (E-CTFE), PEEK-mod, polytetrafluoroethylene (PTFE), polyimide (PI), polyoxymethylene homopolymer (POM-H), silicone polymers, and combinations thereof.

[0353] In one embodiment, for example, the coated member 80 comprises a material with abrasion resistance. In one embodiment, for example, the abrasion-resistant material comprises at least one selected from the group consisting of carbon-based materials, graphite-based materials, molybdenum sulfide, glass fiber, carbon fiber, and combinations thereof.

[0354] In one embodiment, for example, the coating member 80 comprises a conductive material. The conductive material is an electrically conductive material and includes, for example, a conductive polymer. The conductive polymer is an electrically conductive polymer and includes, for example, an organic polymer. The conductive polymer can have electrical conductivity like a metal. In one embodiment, the conductive polymer can have the same properties as, for example, a semiconductor.

[0355] For example, the conductive polymer may include at least one selected from the group consisting of polythiophene conductive polymers, polypyrrole, polyphenylene, polyaniline, polyacetylene, polysulfonitrile, and combinations thereof. For example, polythiophene conductive polymers may include polyethylene dioxythiophene (PEDT), polyethylene dioxythiophene / polycellulose sulfonate (PEDOT / PCS), etc.

[0356] Accordingly, the coated member 80 can improve the wear resistance and friction between the current collector 50 and the uncoated portion of the bundle 411, and will not insulate between the current collector 50 and the uncoated portion of the bundle 411.

[0357] In one embodiment, the coated component 80 may include at least two or more of the following materials mixed together: a low-friction material, a wear-resistant material, and a conductive polymer.

[0358] In one embodiment, with Figure 19 In contrast, the coating member 80 may be formed on the uncoated portion of the bundle 411 instead of the collector member 50. In one embodiment, the coating member 80 may be formed on the side of the uncoated portion of the bundle 411 facing the collector member 50.

[0359] Although not illustrated, for example, the secondary battery 1 may further include an adhesive member on the current collector 50 (e.g., coated onto the current collector 50) and combining (e.g., bonded) the current collector 50 and the uncoated portion bundle 411.

[0360] The adhesive member allows the manifold member 50 to be more securely attached to the uncoated portion bundle 411. The inner surface of the manifold member 50 may be coated with the adhesive member. For example, the side of the manifold member 50 facing the uncoated portion bundle 411 may be coated with the adhesive member. In one embodiment, for example, the entire inner surface of the manifold member 50 may be coated with the adhesive member. In another embodiment, for example, a portion of the inner surface of the manifold member 50 may be coated with the adhesive member. In one embodiment, either the front surface member 51 or the side surface member 52 may be coated with the adhesive member. In one embodiment, a portion of each of the front surface member 51 and the side surface member 52 may be coated with the adhesive member.

[0361] In one embodiment, the inner surface of the manifold 50 can be coated by applying an adhesive member. However, the method of coating the manifold 50 with an adhesive member is not limited to this; for example, the adhesive member can be formed in the form of a strip and attached to the inner surface of the manifold 50.

[0362] For example, the adhesive component includes an adhesive material. In one embodiment, for example, the adhesive component can be formed by mixing an adhesive material and a conductive material.

[0363] For example, adhesive materials may include at least one of silicone resins, acrylic resins, urethane resins, rubber resins, epoxy resins, polyolefins, and combinations thereof.

[0364] For example, acrylic resins may include any one of acryloyl groups, ester copolymers, ethyl acrylate, butyl acrylate, hexyl acrylate, n-octyl acrylate, isooctyl acrylate, 2-ethylhexyl acrylate, isononyl acrylate, lauryl acrylate, acrylic acid, maleic acid, fumaric acid, itaconic acid, krypton acid, acrylamide, N-vinylpyrrolidone, N-vinylcaprolactam, acrylonitrile, acrylometamorpholine, 2-hydroxyethyl acrylate, 2-hydroxypropyl acrylate, 2-hydroxybutyl acrylate, etc.

[0365] For example, urethane resins can include polyurethane, etc.

[0366] For example, rubber-based resins can include natural rubber, synthetic rubber, etc.

[0367] Figure 20 This is a schematic illustration of an electrode assembly with insulating members provided according to an embodiment of the present disclosure.

[0368] Figure 21 This is a perspective view schematically illustrating an insulating member according to an embodiment of the present disclosure.

[0369] According to embodiments of the present disclosure, the secondary battery 1 (e.g., regarding...) Figures 1 to 3 The described secondary battery 1) includes an electrode assembly 40 (e.g., regarding...). Figure 3 , Figure 4 , Figure 6 , Figure 8 , Figure 14 , Figure 15 , Figure 17 and Figure 18 The described electrode assembly 40) and current collector 50 (e.g., regarding...) Figure 3 as well as Figures 7 to 19 The described flow collector component 50).

[0370] For example, the secondary battery 1 further includes an insulating member 60, which is provided at the boundary between the mixed portion a and the uncoated portion n while surrounding the uncoated portion bundle 411, and includes an insulating material.

[0371] In one embodiment, the insulating member 60 is formed to surround at least a portion of the uncoated portion bundle 411. In another embodiment, for example, the insulating member 60 is formed to surround a region in the uncoated portion bundle 411 in which the boundary between the mixed portion a and the uncoated portion n is formed.

[0372] When viewed in the first direction (X-axis), diaphragm 42 (see Figure 4The insulating member 60 can extend toward the uncoated portion n beyond the boundary between the mixed portion a and the uncoated portion n. For example, when viewed in the first direction (X-axis), the insulating member 60 is located on the extended diaphragm 42. Accordingly, the insulating member 60 protects the diaphragm 42. For example, the insulating member 60 prevents or substantially prevents the diaphragm 42 from being damaged by the welding heat generated in the process of welding the current collector 50 and the uncoated portion bundle 411.

[0373] The insulating member 60 includes an insulating material. For example, the insulating material may include at least one selected from the group consisting of polyamide 6 (PA6), polyimide (PI), polysulfone, polyurethane (PU), polyamide (PA), nylon 66, polycarbonate (PC), polytetrafluoroethylene (PTFE), polymethyl methacrylate (PMMA), and polyethylene terephthalate (PET).

[0374] The insulating member 60 can be formed in any shape of various types. In addition, the insulating member 60 can be made of any material of various types, depending on the shape.

[0375] For example, the insulating member 60 can be formed in the form of insulating paper. In one embodiment, for example, the insulating member 60 can be formed in the form of insulating paper comprising polyester series such as PET, polycarbonate (PC), polyvinyl chloride (PVC), etc. In one embodiment, for example, the insulating member 60 can be formed in the form of insulating paper comprising cellulose fiber sheets. The insulating member 60 can be provided on the uncoated portion bundle 411 coated with an adhesive material such as acrylic or silicone.

[0376] In one embodiment, for example, the insulating member 60 may be formed in the form of an insulating tape. For example, the insulating member 60 may be formed in the form of PTFE tape, PI tape, rubber tape (rubber electrical tape), PVC tape (vinyl electrical tape), cellulose acetate tape, epoxy resin tape, glass fiber tape, polyester tape, fiber reinforced tape, etc. The insulating member 60 may be attached to the uncoated portion of the bundle 411.

[0377] In one embodiment, for example, the insulating member 60 may be formed in the form of an insulating tube. For example, the insulating member 60 may be formed in the form of a tube comprising a polymer having excellent impact strength and chemical resistance and / or high heat resistance, such as PEEK, PTFE, polyamide-imide (PAI), polyphenylene sulfide (PPS), PI, polyether-imide (PEI), polyvinylidene fluoride (PVDF), and polyphenylene sulfone (PPUS). The insulating member 60 may be secured to the uncoated portion bundle 411 when the uncoated portion bundle 411 is inserted.

[0378] Accordingly, the insulating member 60 according to embodiments of the present disclosure allows the current collector 50 to be coupled to the electrode assembly 40 without damaging the diaphragm 42.

[0379] In one embodiment, the thickness of the insulating member 60 may be 0.02 mm or less. Accordingly, the insulating member 60 can improve the reliability and / or safety of the secondary battery 1 without reducing the capacity of the secondary battery 1.

[0380] Figure 22 This is a view schematically illustrating an example of a weld line between an uncoated portion and a current collector according to an embodiment of the present disclosure.

[0381] Figure 23 This is a view schematically illustrating an example of a weld line between an uncoated portion and a current collector according to an embodiment of the present disclosure.

[0382] According to embodiments of the present disclosure, the secondary battery 1 (e.g., regarding...) Figures 1 to 3 The described secondary battery 1) includes an electrode assembly 40 (e.g., regarding...). Figure 3 , Figure 4 , Figure 6 , Figure 8 , Figure 14 , Figure 15 , Figure 17 , Figure 18 and Figure 20 The described electrode assembly 40) and current collector 50 (e.g., regarding...) Figure 3 as well as Figures 7 to 19 The described flow collector component 50).

[0383] The current collector 50 can be joined to the uncoated portion bundle 411. In one embodiment, for example, the current collector 50 can be joined to the uncoated portion bundle 411 by welding. In one embodiment, for example, the welding method by which the current collector 50 and the uncoated portion bundle 411 are joined includes any one of laser welding, ultrasonic welding, and plasma micro welding (PMW). Accordingly, the current collector 50 and the uncoated portion bundle 411 can be joined by forming weld lines (e.g., WL1 and WL2).

[0384] For example, such as Figure 22 As shown, the current collector 50 includes a first weld line WL1, which connects to the front surface member 51 (see example). Figure 7The uncoated portions n and uncoated portion bundle 411 are formed in a stacking direction parallel to the uncoated portion n. In this case, for example, the stacking direction of the uncoated portion n is a first direction (X-axis). For example, the first weld line WL1 is formed to extend in the first direction (X-axis). For example, the first weld line WL1 is formed as a plurality of lines extending in the first direction (X-axis) and spaced apart from each other.

[0385] For example, such as Figure 23 As shown, the current collector 50 includes a second weld line WL2, which connects to the front surface member 51 (see example). Figure 7 The uncoated portion n and the uncoated portion bundle 411 are formed in a stacking direction perpendicular to the uncoated portion n. In this case, for example, the stacking direction of the uncoated portion n is a first direction (X-axis). For example, the second welding line WL2 is formed as a plurality of lines extending in a third direction (Z-axis) and spaced apart from each other.

[0386] However, the shape of the weld line formed to join the current collector 50 and the uncoated portion bundle 411 is not limited thereto. For example, at least a portion of the weld line may be formed as a single line. For example, at least a portion of the weld line may be formed as a double line. For example, at least a portion of the weld line may be formed as a triple line. For example, the weld line may be formed in any of a variety of shapes, such as a spiral shape, a curved shape, a serrated shape, etc. In one embodiment, the weld line may include a dot shape.

[0387] Thus, since the current collector 50 and the uncoated portion bundle 411 are in contact with each other over a large area, the weld line can be formed in any shape and / or in any manner.

[0388] Furthermore, as the manifold 50 and the uncoated portion bundle 411 engage, the manifold 50 can be rolled toward the uncoated portion bundle 411 simultaneously (e.g., concurrently) and / or sequentially. For example, the manifold 50 can be rolled toward the uncoated portion bundle 411 by hot-pressing the side surface member 52. Accordingly, the manifold 50 can be attached to the uncoated portion bundle 411 with greater adhesion.

[0389] Figure 24 This is a flowchart illustrating a method for manufacturing a secondary battery according to an embodiment of the present disclosure.

[0390] According to embodiments of the present disclosure, the secondary battery 1 (e.g., regarding...) Figures 1 to 3 The described secondary battery 1) includes an electrode assembly 40 (e.g., regarding...). Figure 3 , Figure 4 , Figure 6 , Figure 8 , Figure 14 , Figure 15 , Figure 17 , Figure 18 , Figure 20 , Figure 22 and Figure 23 The described electrode assembly 40) and current collector 50 (e.g., regarding...) Figure 3 , Figures 7 to 19 , Figure 22 and Figure 23 The described flow collector component 50). Figure 24 A method for manufacturing a secondary battery 1 is described. The following description refers to... Figures 1 to 24 conduct.

[0391] The manufacturing method according to an embodiment of the present disclosure includes a method of manufacturing a secondary battery 1, the secondary battery 1 including an electrode assembly 40 formed by stacking a plurality of electrodes 41, each including a hybrid portion a formed having a first width w1 and an uncoated portion n formed having a second width w2 equal to the first width w1 and extending from the hybrid portion a.

[0392] like Figure 24 As shown, the manufacturing method according to an embodiment of the present disclosure includes an operation S101 of fixing an uncoated portion bundle 411 formed by stacking uncoated portions n. For example, the uncoated portion bundle 411 is formed by stacking uncoated portions n while stacking electrodes 41 and / or diaphragms 42. For example, the uncoated portion bundle 411 can be fixed while each uncoated portion n is neatly arranged. For example, the uncoated portion bundle 411 can be fixed by a belt 41t.

[0393] like Figure 24 As shown, the manufacturing method according to an embodiment of the present disclosure includes operation S102 of arranging the flow collector 50 to cover at least two surfaces of the uncoated portion of the bundle 411.

[0394] In one embodiment, for example, as regarding Figure 14 and Figure 15 The arrangement of the current collector 50 includes the operation of sliding the current collector 50 onto the uncoated portion bundle 411. In one embodiment, for example, as... Figures 16 to 18 As shown, arranging the collector 50 includes bending the bent portion 54 when the collector 50 is rolled to correspond to the shape of the uncoated portion bundle 411.

[0395] like Figure 24 As shown, the manufacturing method according to an embodiment of the present disclosure includes operation S103 of welding the current collector 50 to the uncoated portion bundle 411. For example, the current collector 50 can be welded to the uncoated portion bundle 411 by any of a variety of bonding methods, such as laser welding, ultrasonic welding, and PMW welding.

[0396] As described above, the secondary battery 1 and / or the method for manufacturing the secondary battery 1 according to embodiments of the present disclosure provide a method that simplifies the process and avoids processing problems by using the entire uncoated portion n as a connecting piece and without cutting off the uncoated portion n. Furthermore, in the secondary battery 1 and / or the method for manufacturing the secondary battery 1, the current collector 50 covers at least two surfaces of the uncoated portion bundle 411, thereby increasing the contact area between the uncoated portion n and the current collector 50. Accordingly, the secondary battery 1 and / or the method for manufacturing the secondary battery 1 can improve the welding rate between the current collector 50 and the uncoated portion n and reduce the resistance between the current collector 50 and the electrode assembly 40.

[0397] According to embodiments of this disclosure, the process for manufacturing secondary batteries can be simplified.

[0398] According to embodiments of this disclosure, the welding rate between the uncoated portion and the current collector can be improved.

[0399] According to embodiments of this disclosure, the resistance between the uncoated portion and the current collector can be reduced.

[0400] According to embodiments of this disclosure, it is possible to reduce the heat generated by secondary batteries.

[0401] However, the aspects and effects obtained through this disclosure are not limited to those described above, and those skilled in the art will clearly understand from the description of this disclosure other aspects and technical effects not mentioned.

[0402] Although this disclosure has been described with reference to some embodiments shown in the accompanying drawings, these embodiments are provided as examples only, and those skilled in the art will understand that various modifications and equivalents are possible.

[0403] Therefore, the scope of technical protection of this disclosure should be determined by the patent claims.

Claims

1. A secondary battery, comprising: An electrode assembly includes a plurality of stacked electrodes, each of the plurality of electrodes comprising: a mixed portion having a first width; and an uncoated portion having a second width equal to the first width and extending from the mixed portion, wherein the plurality of uncoated portions are stacked to form an uncoated portion bundle; and A current collector member that covers at least two surfaces of the uncoated portion bundle and is connected to the uncoated portion bundle.

2. The secondary battery according to claim 1, wherein the current collector includes a front surface member located in the direction in which the uncoated portion extends and contacts the front surface of the end portion of the uncoated portion bundle.

3. The secondary battery according to claim 2, wherein the current collector further comprises: A first component, connected to the front surface component, extends in a direction perpendicular to the front surface component, extends parallel to the uncoated portion, and contacts the first surface of the uncoated portion bundle; as well as A second component, connected to the front surface component, extends in a direction perpendicular to the front surface component and contacts a second surface of the uncoated portion bundle, the second surface being positioned opposite to the first surface.

4. The secondary battery of claim 3, wherein at least one of the first member and the second member is configured as one or more plates extending from the front surface member.

5. The secondary battery according to claim 3, wherein the current collector further includes a bent portion with a groove at the boundary between the front surface member and at least one of the first member and the second member.

6. The secondary battery according to claim 2, wherein the current collector further comprises: A third component, connected to the front surface component, extends in a direction perpendicular to the front surface component and contacts the third surface of the uncoated portion bundle, the third surface being the stacked surface of the uncoated portion; as well as A fourth component, connected to the front surface component, extends in a direction perpendicular to the front surface component and contacts the fourth surface of the uncoated portion bundle, the fourth surface being positioned opposite to the third surface.

7. The secondary battery of claim 6, wherein at least one of the third and fourth components is configured as one or more plates extending from the front surface component.

8. The secondary battery of claim 6, wherein the current collector further comprises a bent portion having a groove at the boundary between the front surface member and at least one of the third member and the fourth member.

9. The secondary battery according to claim 2, wherein the current collector further comprises: A first component, connected to the front surface component, extends in a direction perpendicular to the front surface component, extends parallel to the uncoated portion, and contacts the first surface of the uncoated portion bundle; A second component, connected to the front surface component, extends in a direction perpendicular to the front surface component and contacts a second surface of the uncoated portion bundle, the second surface being positioned opposite to the first surface; A third component, connected to the front surface component, extends in a direction perpendicular to the front surface component and contacts a third surface of the uncoated portion bundle, the third surface being the stacked surface of the uncoated portion; as well as A fourth component, connected to the front surface component, extends in a direction perpendicular to the front surface component and contacts the fourth surface of the uncoated portion bundle, the fourth surface being positioned opposite to the third surface. The third surface is positioned adjacent to each of the first surface and the second surface.

10. The secondary battery according to any one of claims 2 to 9, wherein the current collector further comprises a first welding line connecting the front surface member and the uncoated portion bundle and parallel to the stacking direction of the uncoated portion.

11. The secondary battery according to any one of claims 2 to 9, wherein the current collector further comprises a second welding line connecting the front surface member and the uncoated portion bundle and perpendicular to the stacking direction of the uncoated portion.

12. The secondary battery according to any one of claims 1 to 9, further comprising: A coating member is applied to the current collector and configured to reduce friction between the current collector and the uncoated portion of the bundle.

13. The secondary battery according to any one of claims 1 to 9, further comprising: An adhesive member is placed on the current collector and configured to bond the current collector and the uncoated portion bundle together.

14. The secondary battery according to any one of claims 1 to 9, further comprising: An insulating member, which simultaneously surrounds the uncoated portion at the boundary between the mixed portion and the uncoated portion, and includes an insulating material.

15. The secondary battery of claim 1, wherein the electrode assembly comprises a first electrode, a second electrode, and a separator between the first electrode and the second electrode, the first electrode, the second electrode, and the separator being stacked, and The uncoated portion of the bundle includes: A first uncoated portion bundle extends from the first electrode to a first side of the electrode assembly; as well as A second uncoated portion of the bundle extends from the second electrode to a second side of the electrode assembly.

16. The secondary battery according to claim 15, wherein the current collector comprises: A first current collector is located on the first side of the electrode assembly and connected to the first uncoated portion bundle; as well as The second current collector is located on the second side of the electrode assembly and is connected to the second uncoated portion bundle.

17. The secondary battery of claim 15, wherein the current collector is arranged so as not to overlap with the separator in the stacking direction of the first electrode, the second electrode and the separator.

18. A method of manufacturing a secondary battery, the secondary battery comprising an electrode assembly formed by stacking a plurality of electrodes, each of the plurality of electrodes comprising: The mixed portion has a first width; The method includes an uncoated portion having a second width equal to the first width and extending from the mixed portion, the method comprising: Secure the uncoated portion bundle formed by stacking multiple of the uncoated portions; Arrange the current collector to cover at least two surfaces of the uncoated portion of the bundle; and The current collector is welded to the uncoated portion of the bundle.

19. The method of claim 18, wherein arranging the current collector comprises slidably arranging the current collector on the uncoated portion bundle.

20. The method of claim 18, wherein arranging the current collector includes bending a bent portion of the current collector while it is being rolled to correspond to the shape of the uncoated portion bundle.

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