Electrode for secondary battery, electrode assembly for secondary battery, and secondary battery

Abstract

The present disclosure relates to an electrode for a secondary battery, an electrode assembly for a secondary battery including the electrode, and a secondary battery including the electrode assembly, the electrode for a secondary battery according to one embodiment may include: an electrode plate including a conductive material and formed in a sheet form having a predetermined thickness; and an electrode active material layer formed on at least one surface of the electrode plate, the electrode plate including: a coating portion that is a region in which the electrode active material layer is formed; and an uncoated portion formed along at least one side of the electrode plate on an outer side of the coated portion, at least a portion of the uncoated portion including one or more connection portions arranged in a first direction, and forming a pattern region extending in the first direction.

Description

Technical Field

[0001] The present disclosure relates to an electrode for a secondary battery, an electrode assembly for a secondary battery including the electrode, and a secondary battery including the electrode assembly. Background Art

[0002] To address the global warming challenges facing modern society, demand for environmentally friendly technologies is rapidly increasing. In particular, with the growing demand for electric vehicles and energy storage systems (ESS) technology, demand for secondary batteries, which are attracting significant attention as energy storage devices, is also exploding, particularly for high-capacity secondary batteries.

[0003] On the other hand, due to recent fires and explosions that have occurred during the use of secondary batteries, public concerns about the safety of secondary batteries have been growing. In response to these concerns, various attempts have been made in recent years to ensure the safety and stability of secondary batteries.

[0004] The demand for high-capacity secondary batteries is driving the increasing size and density of the cells that make up them. However, this situation presents a greater risk of safety hazards than ever before, should an accident occur. Summary of the Invention

[0005] (1) Technical issues to be resolved

[0006] According to one aspect of the present disclosure, a secondary battery electrode and a secondary battery electrode assembly can be provided, which can quickly and effectively induce fusing of the electrode when overvoltage or overcurrent occurs, thereby preventing further accidents from occurring.

[0007] According to another aspect of the present disclosure, a secondary battery having improved safety and stability may be provided.

[0008] On the other hand, the present disclosure can be widely applied to green technologies such as electric vehicles, battery charging stations, energy storage systems (ESS), and other battery-based solar and wind power generation. Furthermore, the present disclosure can also be applied to eco-friendly transportation, including electric vehicles and hybrid vehicles, which aim to combat climate change by reducing air pollution and greenhouse gas emissions.

[0009] (2) Technical solution

[0010] According to the present disclosure, an electrode for a secondary battery may include: an electrode plate, which contains a conductive material and is formed in the form of a sheet with a predetermined thickness; and an electrode active material layer, which is formed on at least one side of the electrode plate, and the electrode plate includes: a coating portion, which is an area where the electrode active material layer is formed; and an uncoated portion, which is formed along at least one edge of the electrode plate on the outside of the coating portion, and at least a portion of the uncoated portion includes one or more connecting portions arranged along a first direction, and forms a pattern area extending along the first direction.

[0011] According to an embodiment of the secondary battery electrode, the electrode plate may include aluminum.

[0012] According to an embodiment of an electrode for a secondary battery, the pattern area may further include one or more cutting portions passing through the electrode plate, and the pattern area may include multiple connecting portions, and any two adjacent connecting portions among the multiple connecting portions may be separated in the first direction by any one of the one or more cutting portions.

[0013] According to one embodiment of an electrode for a secondary battery, the uncoated portion may include: a base portion formed with a predetermined width along a first boundary between the coated portion and the uncoated portion; and one or more flag portions extending from the base portion in a second direction away from the first boundary, wherein at least a portion of the pattern area is formed in the base portion.

[0014] According to one embodiment, an electrode for a secondary battery, wherein the base may include: a first region, the first region being defined as a region arranged along the first boundary and having a width of 50% to 60% of the predetermined width; and a second region, the second region being a region outside the first region, at least a portion of the pattern region being formed in the second region.

[0015] According to one embodiment of an electrode for a secondary battery, the uncoated portion may include: a base portion formed with a predetermined width along a first boundary between the coated portion and the uncoated portion; and one or more flag portions extending from the base portion in a second direction away from the first boundary, at least a portion of the pattern area is formed in at least one of the one or more flag portions.

[0016] According to one embodiment of an electrode for a secondary battery, the uncoated portion may include: a base portion formed with a predetermined width along a first boundary between the coated portion and the uncoated portion; and one or more flag portions extending from the base portion in a second direction away from the first boundary, the pattern area being formed along the second boundary between the base portion and the one or more flag portions.

[0017] According to an embodiment of the secondary battery electrode, each of the plurality of connection portions may have a width and a height, wherein the width is defined as a length relative to the first direction and the height is defined as a length relative to a direction perpendicular to the first direction.

[0018] According to an electrode for a secondary battery according to one embodiment, when a current equal to or greater than a predetermined reference current value passes through the non-coating portion, at least one of the plurality of connection portions may be fused.

[0019] According to an electrode for a secondary battery according to one embodiment, the value of A defined by the following relational formula 1 may be 1.89×10 7 A / m to 4.25×10 7 A / m,

[0020] [Equation 1]

[0021]

[0022] In the relational expression 1, L is the height of each of the plurality of connection portions, c is the thickness of the electrode plate in the pattern region, f is the total width of the plurality of connection portions, and I is the reference current value.

[0023] According to the electrode assembly for secondary batteries disclosed in the present invention, the electrode assembly for secondary batteries may include a first electrode, a second electrode and a first separator inserted between the first electrode and the second electrode, the first electrode, the first separator and the second electrode are wound around an imaginary winding axis A, the first electrode may include: a first electrode plate, containing a conductive material and formed in the form of a sheet with a predetermined thickness; and a first electrode active material layer formed on at least one side of the first electrode plate, the first electrode plate including: a first coating portion, the first coating portion is an area where the first electrode active material layer is formed; and a first uncoated portion, formed on the outside of the first coating portion along at least one edge of the first electrode plate, at least a portion of the first uncoated portion includes one or more connecting portions arranged along a first direction, and forms a pattern area extending along the first direction.

[0024] According to the secondary battery electrode assembly of the present disclosure, the first electrode plate may include aluminum.

[0025] According to the electrode assembly for a secondary battery disclosed in the present invention, the first uncoated portion may include: a first base portion formed with a predetermined width along a first boundary between the first coated portion and the first uncoated portion; and one or more first flag portions extending from the first base portion in a direction away from the first boundary, i.e., a second direction, at least a portion of the pattern area being formed in the first base portion.

[0026] According to the electrode assembly for secondary batteries disclosed herein, the pattern area may further include one or more cutting portions passing through the first electrode plate, and the pattern area may include multiple connecting portions, and any two adjacent connecting portions among the multiple connecting portions are separated in the first direction by any one of the one or more cutting portions.

[0027] According to the electrode assembly for a secondary battery of the present disclosure, the plurality of connection portions may each have a width and a height, wherein the width is defined as a length based on the first direction, and the height is defined as a length based on a direction perpendicular to the first direction.

[0028] According to the electrode assembly for a secondary battery of the present disclosure, when a current equal to or greater than a predetermined reference current value passes through the first non-coating portion, at least one of the plurality of connection portions may be fused.

[0029] According to the electrode assembly for a secondary battery of the present disclosure, the value of A defined by the following relational formula 1 may be 1.89×10 7 A / m to 4.25×10 7 A / m,

[0030] [Equation 1]

[0031]

[0032] In the relational expression 1, L is the height of each of the plurality of connection portions, c is the thickness of the first electrode plate in the pattern region, f is the total width of the plurality of connection portions, and I is the reference current value.

[0033] A secondary battery according to the present disclosure may include the electrode assembly for a secondary battery according to the present disclosure.

[0034] (3) Beneficial effects

[0035] According to one aspect of the present disclosure, a secondary battery electrode and a secondary battery electrode assembly can be provided, which can quickly and effectively induce fusing of the electrode when overvoltage or overcurrent occurs, thereby preventing further accidents from occurring.

[0036] According to another aspect of the present disclosure, a secondary battery having improved safety and stability may be provided.

[0037] On the other hand, the present disclosure can be widely applied to green technologies such as electric vehicles, battery charging stations, energy storage systems (ESS), and other battery-based solar and wind power generation. Furthermore, the present disclosure can also be applied to eco-friendly transportation, including electric vehicles and hybrid vehicles, which aim to combat climate change by reducing air pollution and greenhouse gas emissions. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 is a diagram illustrating an example of an electrode for a secondary battery according to one embodiment of the present disclosure.

[0039] Figure 2 Observing from the other direction Figure 1 Figure 2 is a diagram showing an example of an electrode for a secondary battery.

[0040] Figure 3 is a diagram illustrating an example of an electrode for a secondary battery according to another embodiment of the present disclosure.

[0041] Figure 4 is a diagram illustrating an example of an electrode for a secondary battery according to still another embodiment of the present disclosure.

[0042] Figure 5 is a diagram illustrating an example of an electrode for a secondary battery according to still another embodiment of the present disclosure.

[0043] Figure 6 yes Figure 1 Magnified view of the A1 area.

[0044] Figure 7 is a diagram illustrating an example of an electrode for a secondary battery according to still another embodiment of the present disclosure.

[0045] Figure 8 is a diagram illustrating an example of an electrode for a secondary battery according to still another embodiment of the present disclosure.

[0046] Figure 9 yes Figure 6 Magnified view of the A2 area.

[0047] Figure 10FIG. 1 is a diagram illustrating an example of an electrode assembly for a secondary battery before winding is completed according to an embodiment of the present disclosure.

[0048] Figure 11 FIG. 1 is a diagram illustrating an example of an electrode assembly for a secondary battery after winding is completed according to an embodiment of the present disclosure.

[0049] Figure 12 is a diagram illustrating an example of an electrode assembly for a secondary battery according to another embodiment of the present disclosure.

[0050] Figure 13 is a diagram illustrating an example of a battery cell constituting a secondary battery according to one embodiment of the present disclosure.

[0051] Figure 14 It shows Figure 13 FIG. 1 is a diagram showing an example of a cross section of region B of a battery cell.

[0052] Description of reference numerals:

[0053] 10: Battery cell 100: Electrode assembly

[0054] 200: External material 300: Collector plate

[0055] 400: Electrode terminal 1000: First electrode

[0056] 2000: Second electrode 3000: First separator

[0057] 10000: Electrode 11000: Electrode plate

[0058] 12000: Electrode active material layer 11100: Coating part

[0059] 11200: Uncoated area 11300: Pattern area

[0060] 11210: base 11220: flag

[0061] 11310: Connecting part 11320: Cutting part DETAILED DESCRIPTION

[0062] The embodiments described in this specification can be modified in various other ways, and therefore, the technology according to one embodiment is not limited to the embodiments described below. Furthermore, throughout this specification, unless otherwise specified, the phrases "including," "equipped with," "comprising," or "having" a component do not exclude other components, but rather may further include other components, and do not exclude components, materials, or processes not further listed.

[0063] In this specification, unless otherwise specified, the terms "same" or "equivalent" may mean that the two objects are identical or equivalent to each other within a permissible error range. For example, the same configuration or physical property measurement value may mean that the two objects being compared are completely identical and identical within the error range. On the other hand, the same physical property measurement value may mean that the difference between the measured values ​​of the two objects is less than approximately 5%, specifically less than approximately 3%, and more specifically less than approximately 1%.

[0064] In this specification, the angle formed by two objects being perpendicular, or being parallel to each other or being side by side with each other may include being geometrically perpendicular or parallel and being within a small error range.

[0065] The numerical ranges used in this specification include the lower and upper limits and all values ​​within the range, increments that are logically derived in the form and breadth of the defined range, all values ​​defined therein, and all possible combinations of upper and lower limits of numerical ranges defined in different forms.

[0066] Unless expressly defined otherwise in this specification, "about" can be considered to be a value within 30%, 25%, 20%, 15%, 10%, or 5% of a stated value.

[0067] In this specification, the use of terms such as "first," "second," and "third" before a component is intended only to avoid confusion regarding the component being referred to, and has nothing to do with the order, importance, or master-slave relationship between the components. For example, the present invention may include only the second component but not the first component.

[0068] In this specification, the "X direction," "Y direction," and "Z direction" may be described with reference to a spatial rectangular coordinate system in which the X, Y, and Z axes are orthogonal to each other. Unless otherwise specified, the Z direction may refer to the height direction, the X direction may refer to a direction perpendicular to the height direction, and the Y direction may refer to a direction perpendicular to both the Z and X directions. However, the X, Y, and Z directions mentioned below are for illustrative purposes only, to facilitate a clearer understanding of the present disclosure. Of course, the definitions of each direction may vary depending on the reference.

[0069] In this specification, "electrically connected" may refer to all connection methods in which multiple objects can be connected so as to be electrically connected to each other without limitation, and may be implemented in various ways, such as multiple objects connected to each other being directly connected or connected through a third object.

[0070] In this specification, a component defined as “…part” may, without limitation, represent a single component or a collection of two or more similar components having common functions, and the collection of components may be composed of hardware and / or software without limitation.

[0071] In this specification, "disposed" may refer to, without limitation, the positional relationship in which one object is placed adjacent to another object. Non-limiting examples include applying one object to another object, adhering one object to another object with an adhesive, attaching by applying heat or pressure, or simply placing or fixing so that at least a portion of one object is in contact with at least a portion of another object within any space.

[0072] In this specification, one object “covering” another object may mean, without limitation, that one object is at least disposed adjacent to another object, thereby blocking or alleviating the functional and structural relationship of any external factors applied to the other object.

[0073] The term "secondary battery" as used in this specification may refer to a battery that generates electrical energy through oxidation reactions and reduction reactions when ions, specifically cations such as lithium ions, are embedded and deintercalated in the positive and negative electrodes. Specifically, the "secondary battery" may refer to any one of a cobalt-lithium battery, a high-nickel lithium battery, a lithium iron phosphate battery, a lithium-ion battery, a lithium polymer battery, a lithium-sulfur battery, a nickel-metal hydride battery, a nickel-cadmium battery, a sodium battery, and an all-solid-state battery. As an example, the term "secondary battery" used in this specification may refer to a lithium-ion secondary battery, but is not limited thereto.

[0074] The term "battery assembly" used in this specification can be a general term for a battery module or a battery pack. Therefore, a battery assembly according to the present disclosure can refer to either a battery module or a battery pack that omits the battery module structure and houses multiple cells, such as a cell-to-pack (CTP).

[0075] The term "battery cell" used in this specification may refer to a basic unit of the above-mentioned secondary battery including an electrode assembly, an electrolyte, and an exterior material as main components, which can charge and discharge electric energy.

[0076] The present disclosure is described in detail below, but this is merely exemplary, and the present disclosure is not limited to the specific embodiments described exemplarily.

[0077] Electrodes for secondary batteries

[0078] Figure 1 is a diagram illustrating an example of an electrode for a secondary battery according to one embodiment of the present disclosure.

[0079] Figure 2 is shown when viewed from another direction Figure 1Figure 2 is a diagram showing an example of an electrode for a secondary battery.

[0080] Reference Figure 1 and Figure 2 According to one embodiment of the present disclosure, an electrode 10000 for a secondary battery may include: an electrode plate 11000, which contains a conductive material and is formed in the form of a sheet with a predetermined thickness; and an electrode active material layer 12000, which is formed on at least one side of the electrode plate 11000, wherein the electrode plate 11000 may include: a coating portion 11100, which is a region where the electrode active material layer 12000 is formed; and an uncoated portion 11200, which is formed outside the coating portion 11100 along at least one side of the electrode plate 11000, wherein at least a portion of the uncoated portion 11200 may include one or more connecting portions 11310 arranged along a first direction DR1, and a pattern region 11300 extending along the first direction DR1 may be formed.

[0081] In one embodiment, a secondary battery electrode 10000 according to an embodiment of the present disclosure may include an electrode plate 11000 and an electrode active material layer 12000 formed on at least one side of the electrode plate 11000. The electrode active material layer 12000 may be formed on at least one side of the electrode plate 11000 as an electrode active material layer by stacking an electrode active material described later in a layered form on at least one side of the electrode plate 11000.

[0082] As described later, in one embodiment, the electrode plate 11000 may include a known conductive material within a range that does not cause a chemical reaction within a secondary battery.

[0083] In one embodiment, the electrode plate 11000 may be in the form of a sheet having a predetermined thickness. Alternatively, in an exemplary embodiment, the electrode plate 11000 may be in the form of a sheet having a generally quadrilateral cross-section (wide side) with long and short sides. However, as described later, while the generally quadrilateral cross-section may be macroscopically defined, the microscopically defined electrode plate 11000 may have various shapes, such as a flag.

[0084] As described later, in one embodiment, the electrode active material layer 12000 may include an electrode active material. The electrode active material may include a material in which lithium ions can be intercalated and deintercalated.

[0085] In one embodiment, the electrode active material layer 12000 may be formed by stacking on at least one side of the electrode plate 11000. In another embodiment, the electrode active material layer 12000 may be formed by stacking on at least a portion of at least one side of the electrode plate 11000.

[0086] Refer again Figure 1 The electrode plate 11000 may include: a coating portion 11100 , which is a region where the electrode active material layer 12000 is formed; and an uncoated portion 11200 , which is formed along one side of the electrode plate 1100 on the outer side of the coating portion 11100 .

[0087] In the above embodiment, the region of the electrode plate 11000 where the electrode active material layer 12000 is stacked, in other words, the region of the electrode plate 11000 in contact with the electrode active material layer 12000 may be defined as the coating portion 11100 .

[0088] In one embodiment, the uncoated portion 11200 may represent an area of ​​the electrode plate 11000 excluding the area defined as the coated portion 11100. In one embodiment, the uncoated portion 11200 may represent an area of ​​the electrode plate 11000 where both surfaces are exposed to the outside, or an area where the electrode active material layer 12000 is not formed on any one surface.

[0089] Refer again Figure 1 The uncoated portion 11200 may be formed along one edge of the electrode plate 11000 on the outer side of the coated portion 11100 .

[0090] Figure 1 1 shows an example of the formation of the coating portion 11100 and the non-coating portion 11200. Figure 1 As shown in the example, the uncoated portion 11200 may be formed along one side of the electrode plate 11000. Specifically, one of the long sides of the electrode plate 11000 has a predetermined width. In other words, this may mean that the electrode active material layer 12000 is not formed in an area having a predetermined width along one side (or the long side) of the electrode plate 11000 on at least one side of the electrode plate 11000.

[0091] In one embodiment, at least a portion of the uncoated portion 11200 may include one or more connecting portions 11310 arranged along the first direction DR1, and may form a pattern region 11300 extending along the first direction DR1. Detailed structures of the connecting portions 11310 and the pattern region 11300 including the connecting portions 11300 will be described later.

[0092] In one embodiment, the secondary battery electrode 10000 may be a positive electrode or a negative electrode.

[0093] In one embodiment, when the secondary battery electrode 10000 is a positive electrode, the electrode 10000 may include a positive electrode plate and a positive electrode active material layer.

[0094] The positive electrode plate can be made of a known conductive material that does not cause a chemical reaction within the secondary battery. For example, the positive electrode plate can be made of any of stainless steel, nickel (Ni), aluminum (Al), titanium (Ti), copper (Cu), and alloys thereof, and can be provided in various forms, such as film, sheet, or foil.

[0095] In the above embodiment, the electrode plate 11000 may comprise any one of stainless steel, nickel (Ni), aluminum (Al), titanium (Ti), copper (Cu), and alloys thereof, and may be provided in various forms such as film, sheet, or foil. In a specific embodiment, the electrode plate 11000 may comprise aluminum. In a more specific embodiment, the electrode plate 11000 may be primarily composed of aluminum.

[0096] On the other hand, in the case of a lithium secondary battery, the positive electrode active material contained in the positive electrode active material layer may include a material in which lithium ions can be intercalated and deintercalated. For example, the positive electrode active material may be a lithium metal oxide.

[0097] According to an exemplary embodiment, the positive electrode active material may include a lithium transition metal composite oxide. In a specific example, the positive electrode active material may include a lithium nickel metal composite oxide. The lithium nickel metal composite oxide may further include at least one of cobalt (Co), manganese (Mn), and aluminum (Al).

[0098] In some embodiments, the positive active material or the lithium nickel metal composite oxide may include a layered structure or a crystalline structure represented by the following Chemical Formula 1.

[0099] [Chemical Formula 1]

[0100] Li x Ni a M b O 2+z

[0101] In Chemical Formula 1, 0.9≤x≤1.2, 0.6≤a≤0.99, 0.01≤b≤0.4, and −0.5≤z≤0.1 may be satisfied. As described above, M may include Co, Mn, and / or Al.

[0102] The chemical structure represented by Chemical Formula 1 represents the bonding relationship contained within the layered structure or crystalline structure of the positive electrode active material, and does not exclude other additional elements. For example, M may include Co and / or Mn, which may serve as the main active element (main active element) of the first electrode active material together with Ni. Chemical Formula 1 is provided to represent the bonding relationship of the main active elements and should be understood to include the introduction and substitution of additional elements.

[0103] On the other hand, in exemplary embodiments, the negative active material or the lithium nickel metal composite oxide may include a layered structure or a crystalline structure represented by the following Chemical Formula 1-1.

[0104] [Chemical Formula 1-1]

[0105] Li x Ni a M1 b1 M2 b2 O 2+z

[0106] In Chemical Formula 1-1, M1 may include Co, Mn, and / or Al. M2 may include the auxiliary elements described above. In Chemical Formula 1-1, 0.9≤x≤1.2, 0.6≤a≤0.99, 0.01≤b1+b2≤0.4, and -0.5≤z≤0.1 may be present.

[0107] In one embodiment, the positive electrode active material may include a lithium metal oxide. Specifically, the positive electrode active material may include the aforementioned lithium nickel metal composite oxide, a lithium iron phosphate (LFP)-based oxide represented by the chemical formula LiFePO4, or a lithium cobalt (LCO)-based oxide represented by the chemical formula LiCoO2.

[0108] In one embodiment, when the secondary battery electrode 10000 is a negative electrode, the electrode 10000 may include a negative electrode plate and a negative electrode active material layer.

[0109] The negative electrode plate can be made of a known conductive material that does not cause a chemical reaction within the secondary battery. For example, the negative electrode plate can be made of any of stainless steel, nickel (Ni), aluminum (Al), titanium (Ti), copper (Cu), and alloys thereof, and can be provided in various forms, such as film, sheet, or foil.

[0110] On the other hand, in the case of a lithium secondary battery, the negative electrode active material contained in the negative electrode active material layer may include a material in which lithium ions can be intercalated and deintercalated. For example, the negative electrode active material may include any one of a carbon-based material such as crystalline carbon, amorphous carbon, a carbon composite material, carbon fiber, a lithium alloy, lithium metal, silicon (Si), and tin (Sn), or a combination thereof.

[0111] In an exemplary embodiment, the electrode 10000 may be a positive electrode. However, the present invention is not limited thereto and, as desired, the electrode 10000 may also be a negative electrode. As described later, the electrode 10000 may function as a positive electrode, a negative electrode, or both, depending on the resistance or melting point of the material contained in the electrode plate 11000.

[0112] Reference Figure 1 and described later Figure 6 In one embodiment, a pattern region 11300 may be formed on at least a portion of the uncoated portion 11200. Furthermore, in one embodiment, the pattern region 11300 may include one or more connecting portions 11310 arranged along the first direction DR1. Furthermore, as described later, the pattern region 11300 may further include one or more cutout portions 11320 penetrating the electrode plate 11000. The connecting portions 11310 and the cutout portions 11320 may be formed in any pattern along the first direction DR1.

[0113] In one embodiment, the patterned region 11300 can be defined as an electrically fragile region such that, when a current exceeding a predetermined reference current value passes through the electrode plate 11000, the connection portion 11310 disconnects, thereby inducing electrical disconnection or melting, as described later. In this case, the patterned region 11300 can also be defined as a region where, when a current exceeding a predetermined reference current value passes through the electrode plate 11000, at least a portion disconnects, thereby functioning as a fuse.

[0114] In one embodiment, the pattern area 11300 may extend along a first direction DR1. The direction may be any direction, for example, any one-dimensional vector including a straight path or a curved path.

[0115] In one embodiment, the pattern area 11300 may represent an area extending along the first direction DR1, for example, may represent an area including a cut line extending along the first direction DR1.

[0116] In one embodiment, the one or more connecting portions 11310 may be arranged along the extension direction of the pattern region 11300. Alternatively, each of the one or more connecting portions 11310 may be defined as a portion of the electrode plate 11000 remaining in the pattern region 11300. In an exemplary embodiment, each of the one or more connecting portions 11310 may be configured to have a width, based on the direction of current flow, that is at least smaller than the overall width of the uncoated portion 11200.

[0117] In the above embodiment, when current passes through the electrode plate 11000, the current may pass through the relatively small connection portion 11310 included in the pattern region 11300. In this case, since the width of the connection portion 11310 is relatively small, the path for current passing therein is relatively narrow, and thus the current may be disconnected or melted when a current exceeding a desired value passes therethrough.

[0118] In one embodiment, the pattern region 11300 may be formed to connect both ends of the non-coating portion 11200 .

[0119] In an exemplary embodiment, as Figure 1 As shown, the pattern region 11300 may be formed to connect both ends of a direction crossing the non-coating portion 11200 based on the extending direction of the non-coating portion 11200 .

[0120] In another exemplary embodiment, the pattern region 11300 may be formed to connect two or more ends of the non-coating portion 11200 excluding the end connected to the coating portion 11100 .

[0121] As described above, the electrode plate 11000 may be in the form of a sheet having a predetermined thickness. For example, the electrode plate 11000 may be in the form of a sheet having a substantially quadrilateral cross-section (wide side) with a long side and a short side. Furthermore, as described above, the uncoated portion 11200 may be formed along one side of the electrode plate 11000. Specifically, the long side of the electrode plate 11000 may have a predetermined width.

[0122] In the above embodiment, the pattern area 11300 can be formed to connect the two ends of the uncoated portion 11200, specifically, a point on one short side of the electrode plate 11000 belonging to the uncoated portion 11200 and a point on the other short side of the electrode plate 11000 belonging to the uncoated portion 11200.

[0123] Therefore, in one embodiment, the uncoated portion 11200 may be divided into two regions by the pattern region 11300. Specifically, the two regions may be connected by one or more connecting portions 11310 in the pattern region 11300. On the other hand, at least one of the two regions divided by the pattern region 11300 may be connected to the coated portion 11100.

[0124] In the above embodiment, when a current above a predetermined reference value passes through the electrode plate 11000, at least a portion of the pattern area 11300, specifically, one or more connecting portions 11310 included in the pattern area 11300, can be melted, thereby releasing the electrical connection between the two areas divided by the pattern area 11300.

[0125] Figure 3 is a diagram illustrating an example of an electrode for a secondary battery according to another embodiment of the present disclosure.

[0126] Figure 4 is a diagram illustrating an example of an electrode for a secondary battery according to another embodiment of the present disclosure.

[0127] Figure 5 is a diagram illustrating an example of an electrode for a secondary battery according to another embodiment of the present disclosure.

[0128] In one embodiment, the pattern area 11300 may further include one or more cutting portions 11320 passing through the electrode plate 11000, the pattern area 11300 may include a plurality of connecting portions 11310, and any two adjacent connecting portions 11310 among the plurality of connecting portions 11310 may be separated in the first direction DR1 by any one of the one or more cutting portions 11320.

[0129] Reference Figures 1 to 5 and described later Figure 6 In addition to the above-mentioned connecting portion 11310 , the pattern area 11300 may further include a cutting portion 11320 .

[0130] In one embodiment, the cut portion 11320 may penetrate the electrode plate 11000 . That is, in one embodiment, the cut portion 11320 may be a slit or a hole formed through the electrode plate 11000 .

[0131] In order to form the above-mentioned incision portion 11320, the incision portion 11320 of the above-mentioned shape can be formed by irradiating a laser or the like with a desired length and pitch.

[0132] In one embodiment, the pattern region 11300 may include a plurality of connection portions 11310 . In one embodiment, two adjacent connection portions 11310 among the plurality of connection portions 11310 may be separated in the first direction DR1 by any one of the one or more cutout portions 11320 .

[0133] That is, in the above embodiment, the pattern region 11300 may include the connecting portions 11310 and the cutting portions 11320 , and the connecting portions 11310 and the cutting portions 11320 are alternately formed along the first direction DR1 .

[0134] The connection portion 11310 and the cut portion 11320 may be formed in various forms. Figure 1 As shown, the plurality of connection portions 11310 and the one or more cutting portions 11320 may be such that each connection portion 11310 and each cutting portion 11320 are included in the pattern area 11300 in the same form.

[0135] In contrast, Figure 3 As shown, the plurality of connection portions 11310 and the one or more cut portions 11320 may be such that only each cut portion 11320 is included in the pattern area 11300 in the same form.

[0136] In contrast, Figure 4 and Figure 5 As shown, the multiple connecting portions 11310 and the one or more cutting portions 11320 can be different in shape from each connecting portion 11310 or different in shape from each cutting portion 11320 .

[0137] Therefore, the pattern formed by the plurality of connection portions 11310 and the one or more cutting portions 11320 can be varied as needed.

[0138] Figure 6 yes Figure 1 Magnified view of the A1 area.

[0139] Reference Figure 6 In one embodiment, the uncoated portion 11200 may include: a base 11210, formed with a predetermined width wb along a first boundary B1 between the coated portion 11100 and the uncoated portion 11200; and one or more flag portions 11220, extending from the base 11210 in a second direction DR2 away from the first boundary B1.

[0140] In one embodiment, the base portion 11210 may represent a region formed along the first boundary B1 with a predetermined width wb in the non-coating portion 11200. In an exemplary embodiment, the base portion 11210 may represent a continuous region formed along the first boundary B1 with a predetermined width wb.

[0141] In one embodiment, the one or more flag portions 11220 may represent regions extending from the base portion 11210 in a direction away from the first boundary B1, that is, in the second direction DR2. Figures 1 to 6 As shown, a plurality of flag portions 11220 may be provided. In the above embodiment, two adjacent flag portions 11220 in the plurality of flag portions 11220 may be spaced apart by a predetermined spacing distance.

[0142] On the other hand, for the sake of explanation, Figures 1 to 6 It is shown that each flag portion 11220 is an area that is roughly parallelogram-shaped, but it is not necessarily limited to this. As needed, each flag portion 11220 can be independently formed into a shape including a triangle, a quadrilateral, a rectangle, a positive direction, a trapezoid, a circle, an ellipse, an oblong, other n-gons (n ​​is a natural number greater than or equal to 5) or at least a part of them.

[0143] On the other hand, for the sake of explanation, Figure 6 The second direction DR2 shown is arbitrarily shown. The second direction DR2 can be any direction as long as it is away from the first boundary B1, and is not necessarily limited to Figure 6 direction shown.

[0144] As described later, during the formation of the electrode assembly, the one or more flag portions 11220 can be bent toward the imaginary winding axis A of the electrode assembly, with the boundary with the base portion 11210, i.e., the second boundary B2, serving as a folding line. The one or more bent flag portions 11220 can be electrically connected to other components within the battery cell, such as a current collector, to serve as a path for transmitting electrical energy generated by the electrode to the outside or for supplying externally supplied electrical energy to the electrode.

[0145] Refer again Figure 6 In one embodiment, the uncoated portion 11200 may include: a base 11210, formed with a predetermined width wb along a first boundary B1, a boundary between the coated portion 11100 and the uncoated portion 11200; and one or more flag portions 11220, extending from the base 11210 in a second direction DR2, a direction away from the first boundary B1, and at least a portion of the pattern area 11300 may be formed in the base 11210.

[0146] That is, in the above embodiment, at least a portion of the pattern region 11300 may be formed in the base 11210. On the other hand, in a specific embodiment, the entire pattern region 11300 may be formed in the base 11210.

[0147] On the other hand, in the above embodiment, the pattern area 11300 may be formed to connect both ends of the base 11210. In an exemplary embodiment, as shown in FIG. Figure 1 The pattern area 11300 may be formed to connect both ends of the direction of the base 11210 based on the extension direction of the non-coating portion 11200. This formation can refer to the later described Figure 10 wait.

[0148] Refer again Figure 6 In one embodiment, the base 11210 may include: a first area 11230, the first area being defined as an area arranged along the first boundary B1 and having a width of 50% to 60% of the predetermined width wb; and a second area 11240, the second area being an area outside the first area 11230, and at least a portion of the pattern area 11300 may be formed in the second area 11240.

[0149] In one embodiment, the base 11210 can be divided into a first area 11230 and a second area 11240 .

[0150] As described above, the base portion 11210 may be formed with a predetermined width wb along the first boundary B1. In this case, the first region 11230 may be defined as a region in the base portion 11210 that is adjacent to the coating portion 11100 with the first boundary B1 as a boundary and has a width of 50% to 60% of the width of the base portion 11210 along the first boundary B1.

[0151] On the other hand, the second region 11240 may represent a region of the base portion 11210 excluding the first region 11230. In the above embodiment, the second region 11240 may be adjacent to the one or more flag portions 11220 with the second boundary B2 serving as a boundary in the base portion 11210, and may be adjacent to the first region 11230 on the opposite side of the second boundary B2.

[0152] In one embodiment, at least a portion of the pattern region 11300 may be formed in the second region 11240. In a specific embodiment, the entire pattern region 11300 may be formed in the second region 11240.

[0153] On the other hand, in the above embodiment, the pattern area 11300 may be formed to connect both ends of the second area 11240. In an exemplary embodiment, as shown in FIG. Figure 1 The pattern area 11300 may be formed to connect both ends of the direction of the base 11210 based on the extension direction of the non-coating portion 11200. This formation can refer to the later described Figure 10 wait.

[0154] In one embodiment, the secondary battery electrode 10000 may further include an insulating portion (not shown) that covers at least a portion of the electrode 10000 along a first boundary B1, which is a boundary between the coated portion 11100 and the uncoated portion 11200, so as to overlap both the coated portion 11100 and the uncoated portion 11200. The insulating portion (not shown) can be used to prevent short circuits caused by contact between electrodes in the electrode assembly, or to prevent breakage during the electrode manufacturing process. For example, the insulating portion (not shown) can be a tape of insulating material attached along the first boundary B1, or a coating of insulating material applied along the first boundary B1.

[0155] In an exemplary embodiment, the insulating portion (not shown) may have a predetermined width wb. In this case, if at least a portion of the pattern region 11300, specifically, the entire pattern region 11300, is included in the second region 11240, physical interference with the insulating portion (not shown) may be eliminated, thereby reducing fusing performance due to the presence of the insulating portion (not shown).

[0156] Figure 7 is a diagram illustrating an example of an electrode for a secondary battery according to still another embodiment of the present disclosure.

[0157] Figure 8 is a diagram illustrating an example of an electrode for a secondary battery according to still another embodiment of the present disclosure.

[0158] With reference Figures 1 to 6 The embodiments of the electrodes according to the present disclosure are described differently. Figure 7 and Figure 8 An embodiment of an electrode in which the position of forming the pattern area 11300 is different from that described above is shown.

[0159] Reference Figures 1 to 7In one embodiment, the uncoated portion 11200 may include: a base 11210, formed with a predetermined width wb along a first boundary B1 between the coated portion 11100 and the uncoated portion 11200; and one or more flag portions 11220, extending from the base 11210 in a direction away from the first boundary B1, that is, a second direction DR2, and at least a portion of the pattern area 11300 may be formed in at least one of the one or more flag portions 11220.

[0160] In a specific embodiment, all of the pattern areas 11300 may be formed in at least one of the one or more flag portions 11220 , and specifically, may be formed in all of the one or more flag portions 11220 .

[0161] On the other hand, in the above embodiment, the pattern region 11300 may be formed to connect the two ends of the one or more flag portions 11220. In a specific embodiment, when multiple flag portions 11220 are provided, the pattern region 11300 may be formed to connect the outer end of the outermost flag portion 11220 in one direction and the outer end of the outermost flag portion 11220 in another direction among the multiple flag portions 11220.

[0162] On the other hand, refer to Figures 1 to 8 In one embodiment, the uncoated portion 11200 may include a base portion 11210 formed with a predetermined width wb along a first boundary B1 between the coated portion 11100 and the uncoated portion 11200; and one or more flag portions 11220 extending from the base portion 11210 in a second direction DR2 away from the first boundary B1. The pattern region 11300 may be formed along a second boundary B2 between the base portion 11210 and the one or more flag portions 11220. In the above embodiment, the second boundary B2 may be included in the pattern region 11300.

[0163] Figure 9 yes Figure 6 Magnified view of the A2 area.

[0164] Reference Figure 9 In one embodiment, each of the plurality of connection portions 11310 may have a width w and a height L, wherein the width w is defined as a length based on the first direction DR1, and the height L is defined as a length based on a direction perpendicular to the first direction DR1.

[0165] In this case, the heights L of the plurality of connection portions 11310 may be the same.

[0166] In one embodiment, each connection portion 11310 may have a width w and a height L as defined above.

[0167] In an exemplary embodiment, as described above, any two adjacent connection portions 11310 among the plurality of connection portions 11310 may be separated in the first direction DR1 by any one of the one or more cutout portions 11320. Therefore, the width w of each connection portion 11310 may be defined as being equal to the distance between the cutout portions 11320, and the height L of each connection portion 11310 may be defined as being equal to the height of the cutout portion.

[0168] In one embodiment, the widths w of the multiple connection portions 11310 may be different or the same.

[0169] In one embodiment, the heights L of the plurality of connection portions 11310 may be the same, or may be at least substantially the same.

[0170] On the other hand, in one embodiment, the thicknesses of the electrode plates 11000 of the plurality of connection portions 11310 may be the same, or may be at least substantially the same.

[0171] On the other hand, the sum of the widths w of the plurality of connection parts 11310 may be defined as a width sum f. The width sum f may be the same as the width of a current path passing through the connection parts 11310 in the electrode plate 11000.

[0172] In one embodiment, when a current greater than a predetermined reference current value passes through the non-coating portion 11200 , at least one of the plurality of connection portions 11310 may be fused.

[0173] In an exemplary embodiment, when at least one of the plurality of connecting portions 11310 is blown due to a current exceeding a predetermined reference current value passing through the uncoated portion 11200, the total width f is further reduced due to the loss of the current path through the blown connecting portion 11310. This means that the width of the current path through the connecting portion 11310 is reduced. In this case, the current flowing through the remaining connecting portions 11310 is further increased, which may cause the remaining connecting portions 11310 to also blow in parallel or sequentially due to the passage of excessive current, ultimately causing all connecting portions 11310 included in the pattern region 11300 to blow.

[0174] According to the above embodiment, when all the connecting portions 11310 included in the pattern region 11300 are melted, the electrical connection between the two divided regions that may be connected by the pattern region 11300 as described above can be released. Therefore, when an overcurrent exceeding a predetermined reference current value is supplied to the electrode plate 11000, the connecting portions 11310 included in the pattern region 11300 will quickly melt, inducing electrical disconnection, thereby preventing fatal safety issues such as short circuits.

[0175] In one embodiment, the value of A defined by the following equation 1 may be 1.89×10 7 A / m to 4.25×10 7 A / m.

[0176] [Equation 1]

[0177]

[0178] In the relational expression 1, L is the height of each of the plurality of connection portions 11310 , c is the thickness of the electrode plate 11000 in the pattern region 11300 , f is the total width of the plurality of connection portions 11310 , and I is the reference current value.

[0179] In the relational expression 1, the thickness of the electrode plate 11000 in the pattern region 11300 may represent the average thickness of the electrode plate 11000 in the region.

[0180] In an exemplary embodiment, A in the [Relational Expression 1] may further satisfy the relationship defined by the following [Relational Expression 2-1].

[0181] [Equation 2-1]

[0182]

[0183] In the above equation 2-1, V is the operating voltage of the battery, ρ m It is the resistivity value based on the melting point of the electrode plate at 11000.

[0184] In an exemplary embodiment, the V value in [Relationship 2-1] can be 2 V to 4.5 V. Within the numerical range, the operating voltage of the battery can be adjusted as needed.

[0185] On the other hand, in an exemplary embodiment, when the electrode plate 11000 includes aluminum, for example, when it is substantially composed of aluminum, in the [Relationship 2-1], ρ m The value can be 1.06×10 -7 Ω·m.

[0186] Therefore, if the required reference current value I is set, the above-mentioned L / c*f value can be limited to the numerical range as described above according to the set reference current value, so that when an overcurrent corresponding to the reference current value occurs, the connection part 11310 reaches the melting point and disconnects due to the resistance caused by the overcurrent passing through the connection part 11310, eventually causing the connection part 11310 to melt.

[0187] In an exemplary embodiment, the reference current value I can be appropriately set as needed.

[0188] Figures 1 to 9 The sheet-shaped electrode extending in one direction is shown, but it is not necessarily limited thereto. Depending on the form of the electrode assembly described later, electrodes grooved in a desired shape may be applied without departing from the scope of the matters defined in the present disclosure. Figures 1 to 9 Various electrode configurations other than the ones shown.

[0189] Electrode assemblies for secondary batteries

[0190] Figure 10 FIG. 1 is a diagram illustrating an example of an electrode assembly for a secondary battery before winding is completed according to an embodiment of the present disclosure.

[0191] Figure 11 FIG. 1 is a diagram illustrating an example of an electrode assembly for a secondary battery after winding according to an embodiment of the present disclosure.

[0192] Reference Figure 10 and Figure 11 According to an embodiment of the present disclosure, an electrode assembly 100 for a secondary battery may include a first electrode 1000, a second electrode 2000, and a first separator 3000 interposed between the first electrode 1000 and the second electrode 2000. The first electrode 1000, the first separator 3000, and the second electrode 2000 are wound around an imaginary winding axis A. The first electrode 1000 may include: a first electrode plate 1100, which includes a conductive material and is formed in a sheet form with a predetermined thickness; and a first electrode active material layer 1200, which is formed on the first electrode plate. On at least one side of the electrode plate 1100, the first electrode plate 1100 may include: a first coating portion 1110, the first coating portion is an area where the first electrode active material layer 1200 is formed; and a first uncoated portion 1120, which is formed on the outside of the first coating portion 1110 along at least one edge of the first electrode plate 1100, wherein at least a portion of the first uncoated portion 1120 may include one or more connecting portions 11310 arranged along a first direction DR1, and a pattern area 11300 extending along the first direction DR1 may be formed.

[0193] Reference Figure 10 , Figures 1 to 9 The example of electrodes shown can be interpreted as Figure 10 An example of a partial region of either the first electrode 1000 or the second electrode 2000 .

[0194] In one embodiment, the secondary battery electrode assembly 100 may include a first electrode 1000 , a second electrode 2000 , and a first separator 3000 interposed between the first electrode 1000 and the second electrode 2000 .

[0195] In one embodiment, the secondary battery electrode assembly 100 may have a roll form in which the first electrode 1000, the first separator 3000, and the second electrode 2000 are wound around an imaginary winding axis A. Figure 10 As shown in the example, the imaginary winding axis A may be an axis parallel to the Z direction.

[0196] On the other hand, refer to Figure 10 The winding direction of the electrode assembly 100 may be defined as a winding direction DRW. The winding direction DRW may essentially have a spiral path and, depending on the context, may refer to a direction toward the winding axis A (the winding center direction) or the opposite direction (the winding end direction).

[0197] In one embodiment, the first electrode plate 1100 may be in the form of a sheet having a predetermined thickness. On the other hand, in an exemplary embodiment, the first electrode plate 1100 may be in the form of a sheet having a substantially quadrilateral cross-section (wide side) with a long side and a short side. For example, in the sheet-shaped first electrode plate 1100, the long side may be represented by Figure 10 As shown in the example, the side formed in the direction parallel to the winding direction DRW, the short side can be represented as follows Figure 10 The illustrated example shows edges formed in a direction parallel to the Z direction. However, as described above, although the first electrode plate 1100 may have a substantially quadrilateral cross-section macroscopically, it may have various shapes such as a flag shape microscopically.

[0198] In addition, regarding the configuration of the first electrode plate 1100 and the configuration of the first electrode active material layer 1200, reference may be made to Figures 1 to 9 The above descriptions about the electrode plate 11000 and the electrode active material layer 12000 are as follows, and therefore, repeated descriptions will be omitted below.

[0199] Refer again Figure 10The first electrode plate 1100 may include: a first coating portion 1110 , which is a region where the first electrode active material layer 1200 is formed; and a first uncoated portion 1120 , which is formed along one edge of the first electrode plate 1100 on the outer side of the first coating portion 1110 .

[0200] Refer again Figure 10 The first non-coating portion 1120 may be formed along one side of the first electrode plate 1100 on the outer side of the first coating portion 1110 .

[0201] Figure 10 1 shows an example of the formation of the first coating portion 1110 and the first non-coating portion 1120. Figure 10 As shown in the example, the first uncoated portion 1120 may be formed along one side of the first electrode plate 1100, specifically, along one of the long sides of the first electrode plate 1100, with a predetermined width. In other words, this may mean that the first electrode active material layer 1200 is not formed in an area having a predetermined width along one side (or the long side) of the first electrode plate 1100 on at least one side of the first electrode plate 1100.

[0202] on the other hand, Figure 10 The first uncoated portion 1120 is shown as being formed along another side of the first electrode plate 1100, specifically, along any one of the short sides of the first electrode plate 1100, specifically, one of the short sides at the end of the winding, with a predetermined width. However, this is not necessarily limited to this; if desired, the first uncoated portion 1120 may not be formed in the aforementioned portion.

[0203] In one embodiment, at least a portion of the first non-coating portion 1120 may include one or more connection portions arranged along the first direction DR1 and may form a pattern region 1130 extending along the first direction DR1 .

[0204] In one embodiment, the direction in which the pattern region 1130 extends, i.e., the first direction DR1, may be parallel to the winding direction DRW. In the above embodiment, the direction in which the one or more connecting portions are arranged may be parallel to the winding direction DRW. However, this is not necessarily limited to this. The pattern region 1130 may extend in various directions as needed.

[0205] In addition, regarding the functional configuration of the pattern area 1130 and the connecting portion, reference may be made to Figures 1 to 9 The above description about the pattern area 11300 and the connecting portion 11310 is omitted below.

[0206] In addition, regarding the configuration of the first electrode plate 1100, the first coating portion 1110 and the first non-coating portion 1120, reference may be made to Figures 1 to 9 The above descriptions about the electrode plate 11000 , the coated portion 11100 , and the uncoated portion 11200 are as described above, and therefore, repeated descriptions will be omitted below.

[0207] In one embodiment, one of the first electrode 1000 and the second electrode 2000 may be a positive electrode, and the other may be a negative electrode. On the other hand, in a specific embodiment, the first electrode 1000 may be a positive electrode, and the second electrode 2000 may be a negative electrode.

[0208] In one embodiment, when the first electrode 1000 is a positive electrode, the first electrode 1000 may include a positive electrode plate and a positive electrode active material layer. Figures 1 to 9 The above descriptions about the positive electrode plate and the positive electrode active material layer are as follows, and therefore, repeated descriptions will be omitted below.

[0209] In the above embodiment, the first electrode plate 1100 may include aluminum. In a specific embodiment, the first electrode plate 1100 may be substantially composed of aluminum.

[0210] Refer again Figure 10 In one embodiment, the first non-coating portion 1120 may include: a first base portion 1121 having a predetermined width WB (refer to Figure 6 and one or more first flag portions 1122 extending from the first base portion 1121 in a direction away from the first boundary, ie, a second direction DR2, and at least a portion of the pattern region 1130 may be formed in the first base portion 1121.

[0211] In one embodiment, the first base portion 1121 may represent an area formed along the first boundary with a predetermined width in the first non-coating portion 1120. In an exemplary embodiment, the first base portion 1121 may represent a continuous area formed along the first boundary with a predetermined width. Specifically, the first base portion 1121 may be formed as follows Figure 10 The shape shown is an example extending along the winding direction DRW.

[0212] In one embodiment, the one or more first flag portions 1122 may represent regions extending from the first base portion 1121 in a direction away from the first boundary, that is, the second direction DR2 .

[0213] On the other hand, in a specific embodiment, Figure 10 As shown, a plurality of first flag portions 1122 may be provided. In the above embodiment, two adjacent first flag portions 1122 in the plurality of first flag portions 1122 may be spaced apart by a predetermined spacing distance.

[0214] Reference Figure 11 During the formation of the electrode assembly 100, the one or more first flag portions 1122 may be bent toward the winding axis A with the boundary with the first base portion 1121, i.e., the second boundary, as a fold line. Figure 11 As shown, the one or more first flag portions 1122 may be bent so that at least a portion of the one or more first flag portions 1122 overlap with each other in the Z direction.

[0215] The one or more first flag portions 1122 bent in this way can be electrically connected to other components in the battery cell, such as a collector plate, to serve as a path for releasing the electrical energy generated by the electrode to the outside or supplying electrical energy supplied from the outside to the electrode.

[0216] On the other hand, in one embodiment, the first uncoated portion 1120 in the secondary battery electrode assembly 100 may further include a first end portion 1125 formed along the first boundary at one end adjacent to the core and the other end adjacent to the end of the roll relative to the winding direction DRW, with the width being the same as or different from that of the first base portion. In the above embodiment, the first base portion 1121 and the one or more first flag portions 1122 are not formed throughout the first uncoated portion 1120, and are not formed at the ends of the first uncoated portion 1120 adjacent to the core and the end of the roll, but are formed only between the ends.

[0217] In addition, regarding the configuration of the first base portion 1121 and the first flag portion 1122, reference may be made to Figures 1 to 9 The above description about the base 11210 and the flag 11220 is as described above, therefore, repeated description will be omitted below.

[0218] On the other hand, in one embodiment, the pattern region 1130 may be formed to connect both ends of the first non-coating portion 1120 .

[0219] Reference Figure 10 In one embodiment, the pattern region 1130 may be formed to connect both ends of the first non-coating portion 1120. Figure 10In a specific embodiment, the pattern region 1130 may be formed to connect both ends of the first base portion 1121. In an exemplary embodiment, the pattern region 1130 may be formed to connect both ends in a direction that crosses the first base portion 1121 based on the extension direction of the first base portion 1121 (i.e., a direction parallel to the winding direction DRW).

[0220] In one embodiment, the first base 1121 may include: a first area, the first area being defined as an area arranged along the first boundary and having a width of 50% to 60% of the predetermined width; and a second area, the second area being an area outside the first area, and at least a portion of the pattern area 1130 may be formed in the second area.

[0221] In one embodiment, the first uncoated portion 1120 may include: a first base portion 1121, formed with a predetermined width along a first boundary between the first coated portion 1110 and the first uncoated portion 1120; and one or more first flag portions 1122, extending from the first base portion 1121 in a direction away from the first boundary, i.e., a second direction DR2, and at least a portion of the pattern area 1130 may be formed in at least one of the one or more first flag portions 1122.

[0222] In one embodiment, the first uncoated portion 1120 may include: a first base portion 1121 formed with a predetermined width along a first boundary between the first coated portion 1110 and the first uncoated portion 1120; and one or more first flag portions 1122 extending from the first base portion 1121 in a second direction DR2 away from the first boundary. The pattern region 1130 may be formed along the second boundary between the first base portion 1121 and the one or more first flag portions 1122. In the above embodiment, the second boundary may be included in the pattern region 1130.

[0223] In addition, the description of the base 11210 and the flag 11220 can also be applied with reference to Figures 1 to 9 The description about the first base portion 1121 and the first flag portion 1122 is as follows.

[0224] In one embodiment, the pattern area 1130 may further include one or more cutting portions passing through the first electrode plate 1100, and the pattern area 1130 may include multiple connecting portions, and any two adjacent connecting portions among the multiple connecting portions may be separated in the first direction DR1 by any one of the one or more cutting portions.

[0225] In one embodiment, each of the plurality of connection portions may have a width and a height, wherein the width is defined as a length relative to the first direction DR1 , and the height is defined as a length relative to a direction perpendicular to the first direction DR1 .

[0226] In one embodiment, each of the plurality of connection portions may have a width and a height, the width being defined as a length based on the first direction DR1, and the height being defined as a length based on a direction perpendicular to the first direction DR1, and the heights of each of the plurality of connection portions may be the same.

[0227] As Figure 10 As shown in the example, as described above, the first direction DR1 can be the same as or at least substantially the same as the winding direction DRW. Therefore, the width can be defined as a length based on a direction substantially the same as the winding direction DRW, and the height can be defined as a length based on a direction substantially perpendicular to the winding direction DRW. In an exemplary embodiment, the height can be defined as a length based on Figure 10 The Z direction shown is the reference length.

[0228] In one embodiment, when a current greater than a predetermined reference current value passes through the first non-coating portion 1120 , at least one of the plurality of connection portions may be fused.

[0229] In one embodiment, the value of A defined by the following equation 1 may be 1.89×10 7 A / m to 4.25×10 7 A / m.

[0230] [Equation 1]

[0231]

[0232] In the equation 1, L is the height of each of the plurality of connection portions, c is the thickness of the first electrode plate 1100 in the pattern region 1130 , f is the total width of the plurality of connection portions, and I is the reference current value.

[0233] In addition, regarding the configuration of the pattern area 1130, the connection portion, the cut portion, the reference current value, etc., reference Figures 1 to 9 The above descriptions about the pattern area 11300, the connecting portion 11310, the cutting portion 11320, the reference current value, etc. are omitted below.

[0234] In one embodiment, the second electrode 2000 may include a second electrode plate 2100 and a second electrode active material layer 2200. The second electrode plate 2100 may include a second coating portion 2110, which is a region where the second electrode active material layer 2200 is formed; and a second uncoated portion 2120, which is formed outside the second coating portion 2110 along one side of the second electrode plate 2100.

[0235] On the other hand, when the second electrode 2000 is a negative electrode, the second electrode 2000 may include a negative electrode plate and a negative electrode active material layer. Figures 1 to 9 The above descriptions about the negative electrode plate and the negative electrode active material layer are as follows, and therefore, repeated descriptions will be omitted below.

[0236] In one embodiment, the second uncoated portion 2120 may include a second base portion 2121 and one or more second flag portions 2122. The description of the first electrode 1000 is also applicable to the second base portion 2121 and the one or more second flag portions 2122. In this case, Figure 10 As shown, the second flag portion 2122 may be formed to extend in a direction different from the second direction DR2.

[0237] In one embodiment, the pattern region 1130 may not be formed on the second electrode 2000. Therefore, in the above embodiment, the pattern region 1130 may be formed only on the first electrode 1000 but not on the second electrode 2000.

[0238] However, this is not necessarily limited to this. If the melting point and / or resistance of the second electrode plate 2100 of the second electrode 2000 is higher than the melting point and / or resistance of the first electrode plate 1100 of the first electrode 1000, then contrary to the above description, the pattern area 1130 can be formed on the second electrode 2000 instead of on the first electrode 1000.

[0239] Reference Figure 10 In one embodiment, the electrode assembly 100 may include a separator. The separator may include a first separator 3000 , and the first separator 3000 is interposed between the first electrode 1000 and the second electrode 2000 .

[0240] In one embodiment, the separator may be formed into a sheet having a predetermined thickness. In an exemplary embodiment, the separator may have a long side and a short side, and the length of the long side of the separator may be the same as the length of the long side of the first electrode 1000 or the second electrode 2000, or may be longer than the length of the long side of either the first electrode 1000 or the second electrode 2000, so as to more reliably prevent an electrical short circuit between the first electrode 1000 and the second electrode 2000.

[0241] In one embodiment, the separator may be made of a material that prevents electrical short circuit between the positive electrode and the negative electrode and allows ion flow. In one embodiment, the separator may have a thickness of 10 μm to 20 μm, but the present disclosure is not limited thereto.

[0242] In one embodiment, the separator may comprise a porous polymer or a porous non-woven fabric. The porous polymer may comprise a polyolefin-based polymer, such as ethylene polymer, propylene polymer, ethylene / butene copolymer, ethylene / hexene copolymer, and ethylene / methacrylate copolymer. The porous non-woven fabric may comprise high-melting-point glass fiber, polyethylene terephthalate fiber, or the like. The separator may also comprise a ceramic-based material. For example, inorganic particles may be coated on or dispersed within the polymer to improve heat resistance.

[0243] The separator may have a single-layer or multi-layer structure including the above-mentioned polymer and / or non-woven fabric.

[0244] In another embodiment, when the secondary battery is an all-solid-state battery or a semi-solid-state battery, the separator may include a solid electrolyte. Examples of the solid electrolyte include oxide-based solid electrolytes, sulfide-based solid electrolytes, or polymer-based solid electrolytes. In the above embodiments, the solid electrolyte may include only a solid electrolyte or may be laminated or coated on a substrate.

[0245] In one embodiment, the first separator 3000 may be interposed between the first electrode 1000 and the second electrode 2000 .

[0246] In the above embodiment, the electrode assembly 100 may be constructed in the form of a roll in which the first electrode 1000 , the first separator 3000 , and the second electrode 2000 are stacked in sequence and wound around a winding axis A.

[0247] In one embodiment, the electrode assembly 100 may further include a second separator (not shown).

[0248] In one embodiment, the second separator (not shown) may be configured to further cover the other surface of the first electrode 1000 and / or the second electrode 2000 in addition to the surface in contact with the first separator 3000 in the electrode assembly 100 including the first electrode 1000 , the first separator 3000 and the second electrode 2000 .

[0249] That is, in the above embodiment, the electrode assembly 100 can be composed of a roll form in which the first electrode 1000, the first diaphragm 3000, the second electrode 2000 and the second diaphragm (not shown) are stacked in sequence and wound around the winding axis A, or it can be composed of a roll form in which the second diaphragm (not shown), the first electrode 1000, the first diaphragm 3000 and the second electrode 2000 are stacked in sequence and wound around the winding axis A.

[0250] Reference Figure 11 In one embodiment, the electrode assembly 100 may further include an insulating cover 5000 , which covers at least a portion of the outer circumference of the electrode assembly 100 wound in a roll form.

[0251] According to an exemplary embodiment, the insulating cover 5000 may be electrically insulating or flexible. The insulating cover 5000 covers at least a portion of the outer circumference of the electrode assembly 100, thereby blocking electrical contact between the electrode assembly 100 and other components of the battery cell, such as the outer packaging material of the battery cell described later, to prevent short circuits or damage to the electrode assembly 100 when the electrode assembly 100 is housed in the outer packaging material of the battery cell described later.

[0252] According to an exemplary embodiment, the insulating cover 5000 may include polyolefin-based polymer, nylon, polyimide, silicon, or the like.

[0253] In one embodiment, the electrode assembly 100 may include a central hole 4000 located adjacent to the winding core. Since the curvature (e.g., radius of curvature) of the electrode assembly 100 increases as it approaches the winding axis A, the central hole 4000 may be provided to prevent damage to the electrode assembly 100.

[0254] In one embodiment, the central hole 4000 may be a channel through which an electrolyte, described later, is injected or moved. In the above embodiment, the electrolyte may be injected through the central hole 4000 and move into and diffuse within the outer packaging material, thereby impregnating the electrode assembly 100.

[0255] In one embodiment, the electrode assembly 100 may further include a center pin inserted into the center hole 4000 .

[0256] Figure 12 is a diagram illustrating an example of an electrode assembly for a secondary battery according to another embodiment of the present disclosure.

[0257] Although Figure 10 and Figure 11 An electrode assembly in the form of a roll wound in a cylindrical shape is shown, but it is not necessarily limited to this. Without departing from the scope of the matters defined in the present disclosure, electrode assemblies having various forms of rolls and electrode assemblies in various forms such as stacking, laminating, and folding can be applied to various forms of electrode assemblies.

[0258] Figure 12 The electrode assembly 100 ′ is shown in a stacked form as exemplified above.

[0259] In one embodiment, the electrode assembly 100' may be a first electrode (not shown) and a second electrode (not shown) interposed with a separator (not shown), and in this form, the first electrode (not shown), the separator (not shown), and the second electrode (not shown) may be stacked in a plurality of electrode assemblies 100'.

[0260] In one embodiment, as shown in FIG. Figures 1 to 11 The electrode assembly 100' includes a first electrode plate (not shown) and a first electrode active material layer (not shown), the first electrode plate (not shown) includes a first coating portion (not shown) and a first uncoating portion (not shown), and at least a portion of the first uncoating portion (not shown) includes one or more connecting portions (not shown) arranged along a first direction to form a pattern area (not shown) extending along the first direction.

[0261] On the other hand, refer to Figure 12 In one embodiment, the electrode assembly 100' may include: a first lead portion 1500' connected to at least one of the first uncoated portions (not shown) of each of the stacked plurality of first electrodes (not shown); and a second lead portion 2500' connected to at least one of the second end portions (not shown) of each of the stacked plurality of second electrodes (not shown).

[0262] In one embodiment, at least a portion of the first lead portion 1500 ′ may include one or more connection portions 11310 ′ arranged along the first direction DR1 to form a pattern region 11300 ′ extending along the first direction DR1 .

[0263] In addition, the formation of the pattern area 11300' can also be applied to the reference Figure 1 and Figure 11 Therefore, other repeated descriptions will be omitted.

[0264] secondary batteries

[0265] Figure 13 is a diagram illustrating an example of a battery cell constituting a secondary battery according to one embodiment of the present disclosure.

[0266] Figure 14 It shows Figure 13 FIG. 1 is a diagram showing an example of a cross section of region B of a battery cell.

[0267] A secondary battery according to one embodiment of the present disclosure may include the secondary battery electrode assembly 100 according to one embodiment of the present disclosure.

[0268] In one embodiment, the secondary battery may include a cell as one of the unit components. The cell may include a Figures 1 to 9 The secondary battery electrode according to one embodiment of the present disclosure or the reference Figure 10 and Figure 11 An electrode assembly for a secondary battery according to an embodiment of the present disclosure is described.

[0269] Figure 13 1 shows a battery cell 10 according to an embodiment of the present disclosure, Figure 14 A cross section of a region of the battery cell 10 is schematically shown.

[0270] on the other hand, Figure 13 and Figure 14 A cylindrical can-type battery cell is shown. However, this is for ease of explanation only and is not necessarily limited to this. As needed, various battery cell forms, such as prismatic cells and pouch-type cells, may be employed without departing from the scope of the present disclosure.

[0271] Reference Figure 13 and Figure 14In one embodiment, the battery cell 10 may include: an outer packaging material 200 having a storage space therein; an electrode assembly 100 for a secondary battery according to an embodiment of the present disclosure, housed in the storage space; and a collector plate 300, housed in the storage space and electrically connected to the electrode assembly 100 for a secondary battery.

[0272] In one embodiment, the secondary battery electrode assembly 100 may include a first electrode, a second electrode, and a first separator interposed between the first electrode and the second electrode, wherein the first electrode, the first separator, and the second electrode are wound around an imaginary winding axis A, wherein the first electrode may include: a first electrode plate, comprising a conductive material and formed in the form of a sheet having a predetermined thickness; and a first electrode active material layer formed on at least one side of the first electrode plate, wherein the first electrode plate may include: a first coating portion, the first coating portion being an area where the first electrode active material layer is formed; and a first uncoated portion, formed along at least one side of the first electrode plate on the outer side of the first coating portion, wherein at least a portion of the first uncoated portion may include a first electrode plate having a predetermined thickness and a first electrode active material layer formed on at least one side of the first electrode plate. Figures 1 to 11 More than one connecting portion is arranged in the first direction) and a pattern area extending along the direction can be formed.

[0273] In addition, the configuration of the electrode assembly 100 can also be applied with reference to Figures 1 to 11 Therefore, repeated description will be omitted below.

[0274] In one embodiment, the exterior material 200 may include: a sidewall portion 210 having a cylindrical shape and having an accommodation space therein; a closed end portion 220 formed at one end of the sidewall portion; and an opening portion provided at the other end of the sidewall portion.

[0275] Reference Figure 13 and Figure 14 In the configuration shown, in an exemplary embodiment, the sidewall portion 210 may be formed in a cylindrical shape. In a specific embodiment, the sidewall portion 210 may be formed in a cylindrical shape with an internal accommodation space. The sidewall portion 210 may accommodate the electrode assembly 100 and the current collector plate 300 in the internal accommodation space.

[0276] In one embodiment, the closed end portion 220 may be formed at one end of the sidewall portion 210. In a specific embodiment, the closed end portion 220 may be formed from one end of the sidewall portion 210 in a direction perpendicular to the extension direction of the sidewall portion 210 to close one end of the sidewall portion 210. Here, the one end may refer to either end of the cylindrical sidewall portion 210, based on the extension direction of the sidewall portion 210.

[0277] In one embodiment, the closed end portion 220 may be formed to extend from one end of the side wall portion 210 . That is, in this case, the closed end portion 220 may be formed integrally with the side wall portion 210 .

[0278] Different from this, in one embodiment, the closed end portion 220 can be formed at one end of the side wall portion 210 or can be formed separately from the side wall portion 210. In the above embodiment, the closed end portion 220 can be formed in a structure that is separable from the side wall portion 210.

[0279] In one embodiment, the closed end portion 220 may constitute a cap assembly together with an electrode terminal 400 and a gasket 410 described later.

[0280] In one embodiment, the opening may be provided at the other end of the sidewall portion 210. Here, the other end may refer to the other end of the cylindrical sidewall portion 210 excluding the one end, based on the extending direction of the sidewall portion 210.

[0281] In one embodiment, the opening may communicate with the accommodation space. Thus, the electrode assembly 100 and the current collector plate 300 may be accommodated within the exterior material 200 through the opening. In one embodiment, the opening may be covered and sealed by a cover plate (not shown), described later. When the opening is covered by the cover plate (not shown), the accommodation space may be sealed from the outside by the sidewall 210, the closed end portion 220, and the cover plate (not shown).

[0282] In one embodiment, the opening is a space communicating with the accommodation space, and may be a plane space including a circle, an ellipse, an oblong, or at least a portion thereof.

[0283] In one embodiment, the cover plate (not shown) may cover the opening portion. As described above, the opening portion may be covered by the cover plate (not shown) to be sealed.

[0284] In one embodiment, the cover plate (not shown) may further include a liquid injection portion for injecting electrolyte or a notching portion for discharging gas, as needed.

[0285] In one embodiment, the cover plate (not shown) may be welded to the exterior material 200. In an exemplary embodiment, the welding method is not particularly limited as long as it can be used to join metal materials.

[0286] In one embodiment, the cover plate (not shown) may be beaded to the exterior material 200. In an exemplary embodiment, the beading may be performed by beading at least a portion of the side wall portion 210, including the area adjacent to the other end of the opening, along the periphery of the side wall portion 210. The cover plate (not shown) is then positioned over the beaded area so that the cover plate (not shown) covers the opening. The area of ​​the side wall portion 210 including the other end is then crimped, thereby achieving the beading. However, the present invention is not necessarily limited to this.

[0287] In one embodiment, the exterior material 200 and the cover plate (not shown) may comprise the same material. Alternatively, the exterior material 200 and the cover plate (not shown) may comprise different materials.

[0288] Refer again Figure 13 and Figure 14 In one embodiment, the battery cell 10 may include an electrode terminal 400 passing through the closed end portion 220 .

[0289] As described above, the closed end portion 220 may constitute a cap assembly together with the electrode terminal 400 and the gasket 410 .

[0290] According to an exemplary embodiment, the electrode terminal 400 may have a substantially "H"-shaped cross-sectional shape and may pass through the closed end portion 220 , with one end of the electrode terminal 400 being located within the accommodation space and the other end protruding outside the accommodation space along the extension direction of the exterior material 200 .

[0291] According to an exemplary embodiment, the electrode terminal 400 can be electrically connected to any one of the electrodes (positive or negative) within the accommodation space. According to an exemplary embodiment, the electrode terminal 400 can be directly connected to at least one of the electrode collector plates (positive or negative) or connected via a separate connecting component. Here, the electrode can be a positive electrode, but this is not limited to this.

[0292] According to an exemplary embodiment, through the above configuration, the electrode terminal 400 may function as an external terminal.

[0293] According to an exemplary embodiment, the gasket 410 may be configured to prevent electrical contact between the electrode terminal 400 and the closed end portion 220 of the exterior material 200 .

[0294] On the other hand, according to one embodiment of the present disclosure, the battery cell 10 may have a configuration in which the opening is covered by a separate cap assembly. In this case, the battery cell 10 may not include a separate cap plate (not shown), and the electrode terminal 400 may be located in the opening.

[0295] Reference Figure 14 In one embodiment, the collector plate 300 includes a conductive material and may be formed into a plate having a predetermined thickness. In an exemplary embodiment, the collector plate 300 may have a cross-section that includes a circular shape, an elliptical shape, an oblong shape, or at least a portion thereof.

[0296] In one embodiment, for example, the collector plate 300 may include any one of stainless steel, nickel (Ni), aluminum (Al), titanium (Ti), copper (Cu), and alloys thereof, and may be provided in various forms such as film, sheet, and foil.

[0297] In one embodiment, the collector plate 300 may be electrically connected to the electrode assembly 100 according to one embodiment of the present disclosure.

[0298] In one embodiment, the collector plate 300 may include a first collector plate 310 and a second collector plate (not shown). In an exemplary embodiment, the first collector plate 310 may be electrically connected to the first electrode of the electrode assembly 100, and the second collector plate (not shown) may be electrically connected to the second electrode of the electrode assembly 100.

[0299] As described above, in one embodiment, the electrode assembly 100 may include a plurality of connection portions disposed along a predetermined direction at at least a portion of the first non-coating portion of the first electrode and may form a pattern region extending along the direction.

[0300] On the other hand, as referenced Figure 10 and Figure 11 In one embodiment, the first uncoated portion may include a first base and one or more first flag portions, and the one or more first flag portions may be bent toward the winding axis A. Specifically, the one or more first flag portions may be bent so that at least a portion of the one or more first flag portions overlap with each other in the Z direction.

[0301] The first collector plate 310 may be Figure 14In the Z direction shown, the first electrode and the first current collector plate 310 are electrically connected by being bonded to the one or more first flag portions bent toward the winding axis A so that at least a portion of the at least one flag portion overlaps in the Z direction. The bonding may be welding bonding, etc., but is not limited thereto.

[0302] On the other hand, in one embodiment, the first current collecting plate 310 may be electrically connected to, specifically, coupled to, the electrode terminal 400 on the other side of the surface coupled to the first electrode.

[0303] Therefore, in one embodiment, the electric energy generated by the first electrode 1000 can be released to the outside through the first collector plate 310 via the electrode terminal 400, or conversely, the electric energy supplied from the outside can enter the battery cell 10 through the electrode terminal 400 and be supplied to the first electrode 1000 through the first collector plate 310.

[0304] In the above embodiment, if an unexpected overvoltage or overcurrent occurs during the process of releasing or supplying electrical energy, electrical disconnection or melting may occur in the pattern area 11300 of an embodiment of the present disclosure as described above, so that when an overvoltage or overcurrent occurs, the electrical connection of the electrodes is quickly released, thereby preventing further accidents from occurring.

[0305] On the other hand, as described above, the pattern area can be formed in the second electrode or in the first and second electrodes according to the melting point or resistance of the electrode plate, so the above disclosure can be appropriately applied to the above embodiments.

[0306] Regarding configurations other than those disclosed above, matters related to components generally used in the field of secondary batteries can be applied without limitation.

[0307] In one embodiment, when the battery cell 10 is Figure 13 and Figure 14 The cylindrical can-type battery cell 10 shown may have a form factor of 18650, 21700, 26650, 32700, 32140, 46110, 4680, 4695, 48110, 4875, or 4880. In specific embodiments, the form factor may be 46110, 4680, 4695, 48110, 4875, or 4880. In a more specific embodiment, the form factor of the battery cell 10 may be 4680, with a diameter of approximately 46 mm and a height of approximately 80 mm, but this is not necessarily limited to the foregoing.

[0308] The battery cell 10 according to one embodiment of the present disclosure can be used not only as a power source for small devices, but can also preferably be used as a unit cell for a battery module and / or battery pack for medium- to large-sized devices including multiple battery cells. Examples of the small devices include mobile phones, laptop computers, cameras, etc., and examples of the medium- to large-sized devices include electric vehicles, hybrid electric vehicles, plug-in hybrid electric vehicles, power storage systems, etc., but are not limited thereto.

[0309] The above description is merely an example of applying the principles of the present disclosure, and other configurations may be included without departing from the scope of the present disclosure.

Claims

1. A secondary battery electrode, comprising: an electrode plate comprising a conductive material and formed in the form of a sheet having a predetermined thickness; as well as The electrode active material layer is formed on at least one side of the electrode plate. The electrode plate comprises: a coating portion, the coating portion being a region where the electrode active material layer is formed; as well as An uncoated portion is formed outside the coated portion along at least one side of the electrode plate. At least a portion of the uncoated portion includes one or more connection portions arranged along a first direction, and forms a pattern region extending along the first direction.

2. The secondary battery electrode according to claim 1, wherein The electrode plate comprises aluminum.

3. The secondary battery electrode according to claim 1, wherein The pattern area further includes one or more cutouts that penetrate the electrode plate. The pattern area includes a plurality of connecting parts, Any two adjacent connection portions among the plurality of connection portions are separated in the first direction by any one of the one or more cutout portions.

4. The secondary battery electrode according to claim 1, wherein The uncoated portion includes: a base portion formed with a predetermined width along a first boundary between the coated portion and the uncoated portion; and One or more flags extending from the base along a second direction away from the first boundary, At least a portion of the pattern area is formed in the base.

5. The secondary battery electrode according to claim 4, wherein The base portion includes: a first region defined as a region disposed along the first boundary and having a width of 50% to 60% of the predetermined width; and a second area, the second area being an area outside the first area, At least a portion of the pattern region is formed in the second region.

6. The secondary battery electrode according to claim 1, wherein The uncoated portion includes: a base portion formed with a predetermined width along a first boundary between the coated portion and the uncoated portion; and One or more flags extending from the base along a second direction away from the first boundary, At least a portion of the pattern area is formed in at least one of the one or more flag portions.

7. The secondary battery electrode according to claim 1, wherein The uncoated portion includes: a base portion formed with a predetermined width along a first boundary between the coated portion and the uncoated portion; and One or more flags extending from the base along a second direction away from the first boundary, The pattern region is formed along a second boundary between the base portion and the one or more flag portions.

8. The secondary battery electrode according to claim 3, wherein Each of the plurality of connection portions has a width and a height, wherein the width is defined as a length based on the first direction, and the height is defined as a length based on a direction perpendicular to the first direction.

9. The secondary battery electrode according to claim 8, wherein When a current equal to or greater than a predetermined reference current value passes through the uncoated portion, at least one of the plurality of connection portions is melted.

10. The secondary battery electrode according to claim 9, wherein The A value defined by the following equation 1 is 1.89×10 7 A / m to 4.25×10 7 A / m, [Equation 1] In the relational expression 1, L is the height of each of the plurality of connection portions, c is the thickness of the electrode plate in the pattern region, f is the total width of the plurality of connection portions, and I is the reference current value.

11. An electrode assembly for a secondary battery, comprising a first electrode, a second electrode, and a first separator interposed between the first electrode and the second electrode, wherein the first electrode, the first separator, and the second electrode are wound around an imaginary winding axis. The first electrode comprises: a first electrode plate comprising a conductive material and formed in a sheet form having a predetermined thickness; as well as A first electrode active material layer is formed on at least one side of the first electrode plate. The first electrode plate comprises: a first coating portion, the first coating portion being a region where the first electrode active material layer is formed; as well as a first uncoated portion formed outside the first coated portion and along at least one side of the first electrode plate; At least a portion of the first non-coating portion includes one or more connection portions arranged along a first direction, and forms a pattern region extending along the first direction.

12. The electrode assembly for a secondary battery according to claim 11, wherein The first electrode plate includes aluminum.

13. The electrode assembly for a secondary battery according to claim 11, wherein The first uncoated portion includes: a first base portion formed with a predetermined width along a first boundary between the first coating portion and the first non-coating portion; and One or more first flag portions extend from the first base portion in a second direction away from the first boundary, At least a portion of the pattern area is formed in the first base portion.

14. The electrode assembly for a secondary battery according to claim 11, wherein The pattern area further includes one or more cutouts that penetrate the first electrode plate. The pattern area includes a plurality of connecting parts, Any two adjacent connection portions among the plurality of connection portions are separated in the first direction by any one of the one or more cutout portions.

15. The electrode assembly for a secondary battery according to claim 14, wherein Each of the plurality of connection portions has a width and a height, wherein the width is defined as a length based on the first direction, and the height is defined as a length based on a direction perpendicular to the first direction.

16. The electrode assembly for a secondary battery according to claim 15, wherein When a current having a predetermined reference current value or higher passes through the first non-coating portion, at least one of the plurality of connection portions is melted.

17. The electrode assembly for a secondary battery according to claim 16, wherein: The A value defined by the following equation 1 is 1.89×10 7 A / m to 4.25×10 7 A / m, [Equation 1] In the relational expression 1, L is the height of each of the plurality of connection portions, c is the thickness of the first electrode plate in the pattern region, f is the total width of the plurality of connection portions, and I is the reference current value. 18 . A secondary battery comprising the electrode assembly for a secondary battery according to claim 11 .

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