Electrode current collector, electrode assembly comprising electrode current collector, and method for manufacturing electrode current collector

Abstract

The present invention relates to an electrode current collector, an electrode assembly including the electrode current collector, and a method for manufacturing the electrode current collector. The electrode current collector according to the present invention includes an electrode tab extending from an end portion, and includes a polymer layer and a first metal layer and a second metal layer stacked on respective surfaces of the polymer layer. A metal wedge inserted so as to reach the polymer layer is positioned on at least one of the first metal layer or the second metal layer of the electrode tab.

Description

Electrode current collector, electrode assembly including electrode current collector, and method for manufacturing electrode current collector

[0001] Cross-citation with related applications

[0002] This application claims the benefit of priority to Korean Patent Application No. 10-2023-0107801, filed August 17, 2023, and Korean Patent Application No. 10-2024-0108650, filed August 13, 2024, the entire contents of which are incorporated herein by reference.

[0003] Technology field

[0004] The present invention relates to an electrode current collector, an electrode assembly including the electrode current collector, and a method for manufacturing the electrode current collector.

[0005] Secondary batteries, unlike primary batteries, are rechargeable and have the potential for miniaturization and large capacity, leading to significant research and development in recent years. With the increasing technological development and demand for electric vehicles, energy storage systems (ESS), and mobile devices, the demand for secondary batteries as an energy source is rapidly increasing. However, the safety of secondary batteries has not kept pace with technological advancements. To address this, methods include creating an electrical short to drain energy before secondary batteries exhibit abnormal behavior, or shorting electrical connections to improve safety.

[0006] Secondary batteries are classified into coin-shaped batteries, cylindrical batteries, square batteries, and pouch-shaped batteries, depending on the shape of the battery case. In secondary batteries, the electrode assembly mounted inside the battery case is a rechargeable power generation device composed of a laminated structure of electrodes and a separator.

[0007] Electrode assemblies can be roughly classified into a jelly-roll type in which a separator is interposed between sheet-shaped positive and negative electrodes on which an active material is applied to a current collector, a stack type in which a plurality of positive and negative electrodes are sequentially stacked with a separator interposed between them, and a stack / folding type in which stacked unit cells are wound with a long separator film.

[0008] One aspect of the present invention is to provide an electrode current collector having improved weldability, an electrode assembly including the electrode current collector, and a method for manufacturing the electrode current collector.

[0009] An electrode current collector according to an embodiment of the present invention is an electrode current collector including an electrode tab extending from an end thereof, and including a polymer layer and a first metal layer and a second metal layer laminated on both sides of the polymer layer, wherein a metal wedge inserted into at least one of the first metal layer or the second metal layer from the electrode tab to the polymer layer may be positioned.

[0010] In addition, an electrode assembly according to an embodiment of the present invention is an electrode assembly in which electrodes and separators are alternately laminated, wherein the electrode includes an electrode current collector including an electrode tab extending from an end thereof, and the electrode current collector includes a polymer layer and a first metal layer and a second metal layer laminated on both sides of the polymer layer in a lamination direction, and a metal wedge inserted into at least one of the first metal layer or the second metal layer from the electrode tab to the polymer layer may be positioned.

[0011] In addition, a method for manufacturing an electrode current collector according to an embodiment of the present invention may include a lamination process for forming a laminate by laminating a first metal layer and a second metal layer on both sides of a polymer layer; a tab forming process for forming an electrode tab by notching an end portion of the laminate; and a wedge insertion process for inserting a metal wedge into at least one of the first metal layer and the second metal layer in the electrode tab up to the polymer layer.

[0012] According to the present invention, there is an effect of significantly improving weldability by inserting a metal wedge into the metal layer located at a portion forming an electrode tab in an electrode current collector in which a metal layer is laminated on both sides of a polymer layer, up to the polymer layer.

[0013] Figure 1 is a perspective view showing an electrode collector according to an embodiment of the present invention.

[0014] FIG. 2 is a cross-sectional view showing a first example of an electrode tab in an electrode collector according to an embodiment of the present invention.

[0015] FIG. 3 is a perspective view showing an example of an electrode breaker in an electrode current collector according to an embodiment of the present invention.

[0016] FIG. 4 is a perspective view showing another example of an electrode breaker in an electrode collector according to an embodiment of the present invention.

[0017] FIG. 5 is a cross-sectional view showing a second example of an electrode tab in an electrode collector according to an embodiment of the present invention.

[0018] Fig. 6 is a cross-sectional view showing a third example of an electrode tab in an electrode collector according to an embodiment.

[0019] Fig. 7 is a cross-sectional view showing a fourth example of an electrode tab in an electrode collector according to an embodiment.

[0020] Figure 8 is a cross-sectional view showing an electrode assembly according to an embodiment of the present invention.

[0021] Figure 9 is a side view showing an electrode assembly according to an embodiment of the present invention.

[0022] Fig. 10 is a perspective view showing an electrode tab of an electrode collector in an electrode assembly according to an embodiment of the present invention.

[0023] Fig. 11 is a cross-sectional view showing a secondary battery including an electrode collector according to an embodiment of the present invention.

[0024] Figure 12 is a perspective view showing a lamination process in a method for manufacturing an electrode current collector according to an embodiment of the present invention.

[0025] Figure 13 is a perspective view showing a tab forming process in a method for manufacturing an electrode current collector according to an embodiment of the present invention.

[0026] Fig. 14 is a perspective view showing a tab insertion process in a method for manufacturing an electrode current collector according to an embodiment of the present invention.

[0027] Fig. 15 is a perspective view showing a tab-breaking insertion process through a roll in a method for manufacturing an electrode current collector according to an embodiment of the present invention.

[0028] The objects, specific advantages, and novel features of the present invention will become more apparent from the following detailed description and preferred embodiments taken in conjunction with the accompanying drawings. In this specification, when reference numerals are given to components in each drawing, it should be noted that, as far as possible, identical components are given the same reference numerals even if they are shown in different drawings. Furthermore, the present invention may be embodied in various different forms and is not limited to the embodiments described herein. Furthermore, in describing the present invention, detailed descriptions of related known technologies that may unnecessarily obscure the gist of the present invention will be omitted.

[0029]

[0030] Electrode current collector according to the embodiment

[0031]

[0032] FIG. 1 is a perspective view showing an electrode current collector according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view showing a first example of an electrode tab in an electrode current collector according to an embodiment of the present invention.

[0033] Referring to FIGS. 1 and 2, an electrode current collector (110) according to an embodiment of the present invention is an electrode current collector (110) including an electrode tab (111) extended at an end, and includes a polymer layer (112) and a first metal layer (113) and a second metal layer (114) laminated on both sides of the polymer layer (112), and a metal wedge (115) is positioned on at least one of the first metal layer (113) or the second metal layer (114) in the electrode tab (111).

[0034]

[0035] In more detail, the electrode current collector (110) includes an electrode tab (111) extending from an end. That is, the electrode tab (111) may be formed by notching the end of the electrode current collector (110).

[0036] In addition, the electrode current collector (110) includes a polymer layer (112) and a first metal layer (113) and a second metal layer (114) laminated on both sides of the polymer layer (112) in the lamination direction. Here, the polymer layer (112) is a layer including a polymer material, and the first metal layer (113) and the second metal layer (114) are layers including a metal material. Therefore, the electrode current collector (110) is provided in a form in which the first metal layer (113) and the second metal layer (114) are laminated on both sides of the polymer layer (112), thereby preventing a fire caused by excessive current density that occurs when the electrode current collector is made only of a metal material. In addition, the electrode current collector (110) can form a first metal layer (113) and a second metal layer (114) on both sides, so that when breaking occurs, the risk of a short due to a metal burr or the like can be reduced.

[0037] In addition, for example, the thickness of the polymer layer (112) may be 2 to 14 um, and the thicknesses of the first metal layer (113) and the second metal layer (114) may be 0.2 to 3 um.

[0038]

[0039] A metal wedge (115) is inserted and positioned in at least one of the first metal layer (113) or the second metal layer (114) from the electrode tab (111) up to the polymer layer (112). At this time, the height (h1) of the metal wedge (115) inserted in the first metal layer (113) or the second metal layer (114) may be greater than the thicknesses (t1, t2) of the first metal layer (113) and the second metal layer (114).

[0040] Additionally, the metal wedge (115) may include a metal material. In addition, the metal wedge (115) may include, for example, the same material as the material of the first metal layer (113) and the second metal layer (114).

[0041] In addition, the metal wedge (115) may include a plurality of first metal wedges (115a) positioned on the first metal layer (113) and a plurality of second metal wedges (115b) positioned on the second metal layer (114).

[0042] Here, the first metal wedge (115a) and the second metal wedge (115b) can be positioned at a certain distance apart from each other.

[0043] In addition, the mutual spacing (t0) between the first metal wedge (115a) and the second metal wedge (115b) can be 2 to 10 um.

[0044] Accordingly, the mutual spacing (t0) between the first metal wedge (115a) and the second metal wedge (115b) is formed to be equal to or greater than the lower limit of 2 um, so that the effect of preventing fire caused by excessive current density of the electrode current collector (110) in which the first metal layer (113) and the second metal layer (114) are laminated on both sides of the polymer layer (112) can be implemented. That is, the mutual spacing (t0) between the first metal wedge (115a) and the second metal wedge (115b) is formed to be equal to or greater than the lower limit of 2 um, so that thermal stability can be significantly improved.

[0045] Meanwhile, the mutual spacing (t0) between the first metal wedge (115a) and the second metal wedge (115b) is formed to be less than the upper limit of 10 um, so that welding is significantly easier and conductivity can be significantly increased.

[0046]

[0047] FIG. 3 is a perspective view showing an example of an electrode breaker in an electrode current collector according to an embodiment of the present invention, and FIG. 4 is a perspective view showing another example of an electrode breaker in an electrode current collector according to an embodiment of the present invention.

[0048] Meanwhile, referring to FIGS. 2 to 4, the metal wedge (115) may be provided in the shape of a pyramid or cone with the apex facing the polymer layer (112). Here, the height (h1) and width (w1) of the metal wedge (115) may be formed to be, for example, 1 to 5 um.

[0049] And, referring to FIG. 3, the metal wedge (115) may be formed in a pyramidal shape, for example, having a polygonal base and a triangular side, which is a pyramidal shape. In addition, the metal wedge (115) may be formed specifically in a triangular pyramid or a square pyramid, for example. Here, the metal wedge (115) may be formed more specifically in a square pyramid, for example. At this time, the height and the width of one side (w1) of the metal wedge (115) may be formed in a range of, for example, 1 to 5 μm.

[0050] In addition, referring to FIG. 4, the metal wedge (115') may be formed in the shape of a cone, for example, having a three-dimensional shape with a circular base and curved sides. At this time, the height and diameter of the metal wedge (115) may be formed to be, for example, 1 to 5 um.

[0051]

[0052] Meanwhile, referring to FIG. 2, as a first example of the electrode tab (111), the first metal wedge (115a) and the second metal wedge (115b) may be positioned parallel to each other in the stacking direction. Here, in the first example of the electrode tab (111), the thicknesses of the first metal layer (113) and the second metal layer (114) may be the same. At this time, for example, the thicknesses of the first metal layer (113) and the second metal layer (114) may be 0.5 to 1 um.

[0053]

[0054] FIG. 5 is a cross-sectional view showing a second example of an electrode tab in an electrode collector according to an embodiment of the present invention.

[0055] Meanwhile, referring to FIG. 5, as a second example of the electrode tab (111), the first metal wedge (215a) and the second metal wedge (215b) in the metal wedge (215) may be positioned alternately in the stacking direction. Here, in the second example of the electrode tab (111), the thicknesses of the first metal layer (113) and the second metal layer (114) may be the same. At this time, for example, the thicknesses of the first metal layer (113) and the second metal layer (114) may be 0.5 to 1 um.

[0056]

[0057] Fig. 6 is a cross-sectional view showing a third example of an electrode tab in an electrode current collector according to an embodiment, and Fig. 7 is a cross-sectional view showing a fourth example of an electrode tab in an electrode current collector according to an embodiment.

[0058] Referring to FIGS. 6 and 7, in the third and fourth examples of the electrode tab (111), the thickness (t3, t5) of the first metal layer (313, 413) and the thickness (t4, t6) of the second metal layer (314, 414) may be formed differently from each other. At this time, the metal wedge (315, 415) may be provided on the second metal layer (314, 414).

[0059] And, referring to FIG. 6, as a third example of the electrode tab (111), the thickness (t3) of the first metal layer (313) may be formed to be thicker than the thickness (t4) of the second metal layer (314). Here, for example, the thickness (t3) of the first metal layer (313) may be 1 to 3 um, and the thickness (t4) of the second metal layer (314) may be 0.2 to 0.5 um. At this time, the height (h3) and width (w3) of the metal wedge (315) may be formed to be larger than the thickness (t4) of the second metal layer (314).

[0060] Meanwhile, referring to FIG. 7, as a fourth example of the electrode tab (111), the thickness (t5) of the first metal layer (413) may be formed thinner than the thickness (t6) of the second metal layer (414). Here, for example, the thickness (t5) of the first metal layer (413) may be 0.2 to 0.5 um, and the thickness (t6) of the second metal layer (414) may be 1 to 3 um. At this time, the height (h4) and width (w4) of the metal wedge (415) may be formed larger than the thickness (t6) of the second metal layer (414). Here, for example, the height (h4) and width (w4) of the metal wedge (415) may be 1.5 to 5 um.

[0061] In addition, the mutual spacing (t7) between the metal wedge (415) and the first metal layer (413) can be 2 to 10 um.

[0062] Accordingly, the mutual spacing (t7) between the metal wedge (415) and the first metal layer (413) is formed to be equal to or greater than the lower limit of 2 um, so that the effect of preventing fire caused by excessive current density of the electrode current collector (110) in which the first metal layer (113) and the second metal layer (114) are laminated on both sides of the polymer layer (112) can be implemented. That is, the mutual spacing (t7) between the metal wedge (415) and the first metal layer (413) is formed to be equal to or greater than the lower limit of 2 um, so that thermal stability can be significantly improved.

[0063] Meanwhile, the mutual gap (t7) between the metal wedge (415) and the first metal layer (413) is formed to be less than the upper limit of 10 um, so that welding is significantly easier and conductivity can be significantly increased.

[0064]

[0065] Referring to FIGS. 1 and 2, the electrode current collector (110) according to the embodiment of the present invention configured as described above has the effect of significantly improving weldability by inserting a metal wedge (115) into the metal layer located at the portion where the electrode tab (111) is formed in the metalized electrode current collector (110) in which metal layers are laminated on both sides of the polymer layer (112). That is, when the electrode tabs (111) respectively provided on a plurality of electrode current collectors (110) are welded to each other to form an electrode assembly and when the electrode tabs (111) and the electrode leads are welded, the metal wedge (115) is inserted into the welding portion up to the polymer layer (112), so that the thickness of the polymer layer (112) portion is formed thin, and as the gap between the metal portions located on both sides of the polymer layer (112) is narrowed, there is the effect of significantly improving welding. Ultimately, when welding using a laser or ultrasonic wave, it is possible to prevent the weldability from being reduced due to the laser or ultrasonic wave not passing through the polymer layer (112).

[0066]

[0067] Electrode assembly according to the embodiment

[0068]

[0069] Hereinafter, an electrode assembly according to an embodiment of the invention will be described.

[0070] FIG. 8 is a cross-sectional view showing an electrode assembly according to an embodiment of the present invention, and FIG. 9 is a side view showing an electrode assembly according to an embodiment of the present invention.

[0071] Referring to FIGS. 1, 2, 8, and 9, an electrode assembly (100) according to an embodiment of the present invention is an electrode assembly (100) in which electrodes (130) and separators (140) are alternately laminated, wherein the electrode (130) includes an electrode current collector (110) including an electrode tab (111) extending from an end thereof, and the electrode current collector (110) includes a polymer layer (112) in a lamination direction and a first metal layer (113) and a second metal layer (114) laminated on both sides of the polymer layer (112), and a metal wedge (115) inserted from the electrode tab (111) to the polymer layer (112) is positioned in at least one of the first metal layer (113) or the second metal layer (114).

[0072] An electrode assembly (100) according to an embodiment of the present invention relates to an electrode assembly (100) including an electrode collector (110) according to the embodiment described above. Therefore, in this embodiment, overlapping content with the embodiment described above is omitted or briefly described, and differences are described.

[0073]

[0074] In more detail, the electrode assembly (100) according to an embodiment of the present invention is a power plant capable of charging and discharging, and forms a structure in which electrodes (130) and separators (140) are combined and alternately laminated.

[0075] The electrode (130) includes an electrode current collector (110) including an electrode tab (111) extending from one end.

[0076] Here, the electrode (130) may include an electrode current collector (110) and an electrode active material (120) coated on one or both sides of the electrode current collector (110). At this time, the electrode (130) may be formed with a holding region where the electrode active material (120) is coated on the electrode current collector (110) and a non-coated region where the electrode active material (120) is not coated on the electrode current collector (110). At this time, an electrode tab (111) may be positioned in the non-coated region of the electrode current collector (110).

[0077] The electrode current collector (110) may include a polymer layer (112) and a first metal layer (113) and a second metal layer (114) laminated on both sides of the polymer layer (112) in the lamination direction. At this time, a metal wedge (115) inserted into the polymer layer (112) is positioned in at least one of the first metal layer (113) or the second metal layer (114) in the electrode tab (111).

[0078] Meanwhile, the polymer layer (112) may be formed of a material including, for example, PET (polyethylene terephthalate), PI (polyimide), or EN (polyethylenenaphthalate).

[0079]

[0080] Fig. 10 is a perspective view showing an electrode tab of an electrode collector in an electrode assembly according to an embodiment of the present invention.

[0081] Meanwhile, referring to FIGS. 8 to 10, an electrode assembly (100) may include a plurality of electrodes (130) and a separator (140) stacked thereon. At this time, the electrode tabs (111) of the electrode current collectors (110) provided on each of the plurality of electrodes (130) are gathered together and welded, and the metal wedge (115) may be positioned at the welding portion (P) of the electrode tab (111). Accordingly, when welding the metalized electrode current collector (110), the metal wedge (115) may be positioned at the welding portion (P) of the electrode tab (111), so that weldability may be significantly improved. That is, the weldability between the electrode tabs (111) and the weldability between the electrode tabs (111) and the electrode lead may be significantly improved.

[0082]

[0083] Meanwhile, the electrode (130) may include an anode (130a) and a cathode (130b). In addition, the separator (140) electrically insulates the anode (130a) and the cathode (130b) by separating them.

[0084] The positive electrode (130a) may include a positive electrode current collector (110a) and a positive electrode active material (120a) provided on one surface of the positive electrode current collector (110a). In this case, the positive electrode (130a) may include a positive electrode non-laminated region, which is a region where the positive electrode active material (120a) is not laminated.

[0085] The positive electrode active material (120a) may be composed of lithium manganese oxide, lithium cobalt oxide, lithium nickel oxide, lithium iron phosphate, or a compound or mixture containing one or more of these.

[0086] The negative electrode (130b) may include a negative electrode current collector (110b) and a negative electrode active material (120b) provided on one surface of the negative electrode current collector (110b). At this time, the negative electrode (130b) may include a negative electrode non-laminated region, which is a region where the negative electrode active material (120b) is not laminated.

[0087] The negative electrode active material (120b) may be formed of, for example, artificial graphite, lithium metal, lithium alloy, carbon, petroleum coke, activated carbon, graphite, silicon compound, tin compound, titanium compound, or an alloy thereof. In this case, the negative electrode active material (120b) may further include, for example, non-graphite SiO (silica) or SiC (silicon carbide).

[0088] Meanwhile, the positive electrode current collector (110a) and the negative electrode current collector (110b) may include a polymer layer (112) and a first metal layer (113) and a second metal layer (114) laminated on both sides of the polymer layer (112) in the lamination direction.

[0089] At this time, the first metal layer (113) and the second metal layer (114) located on the positive electrode collector (110a) may include an aluminum material, and the first metal layer (113) and the second metal layer (114) located on the negative electrode collector (110b) may include a copper material.

[0090]

[0091] Fig. 11 is a cross-sectional view showing a secondary battery including an electrode collector according to an embodiment of the present invention.

[0092] Meanwhile, referring to FIG. 11, a secondary battery (10) can be manufactured including an electrode assembly (100) according to an embodiment of the present invention configured as described above. That is, the secondary battery (10) can be formed by accommodating the electrode assembly (100) in a pouch (20). At this time, the secondary battery (10) can be formed by further including an electrode lead (30) that is connected to the electrode assembly (100) and electrically connects it to the outside of the pouch (20).

[0093]

[0094] Method for manufacturing electrode current collector according to an embodiment

[0095]

[0096] Hereinafter, a method for manufacturing an electrode current collector, which is an embodiment of the present invention, will be described.

[0097] FIG. 12 is a perspective view showing a lamination process in a method for manufacturing an electrode current collector according to an embodiment of the present invention, FIG. 13 is a perspective view showing a tab forming process in a method for manufacturing an electrode current collector according to an embodiment of the present invention, and FIG. 14 is a perspective view showing a tab breaker insertion process in a method for manufacturing an electrode current collector according to an embodiment of the present invention.

[0098] Referring to FIGS. 12 to 14, a method for manufacturing an electrode current collector according to an embodiment of the present invention is a method for manufacturing an electrode current collector, and includes a lamination process for forming a laminate (S) by laminating a first metal layer (113) and a second metal layer (114) on both sides of a polymer layer (112), a tab forming process for forming an electrode tab (111) by notching an end portion of the laminate (S), and a wedge insertion process for inserting a metal wedge (115) inserted into at least one of the first metal layer (113) or the second metal layer (114) in the electrode tab (111) up to the polymer layer (112).

[0099] The method for manufacturing an electrode current collector according to an embodiment of the present invention relates to a method for manufacturing an electrode current collector for manufacturing an electrode current collector included in an electrode assembly according to an embodiment of the present invention and an electrode current collector according to the above-described embodiment of the present invention.

[0100] Accordingly, in the embodiment of the electrode collector manufacturing method according to the embodiment of the present invention, overlapping contents with the embodiments of the present invention described above are omitted or briefly described, and differences are described.

[0101]

[0102] In more detail, referring to FIG. 12, the lamination process forms a laminate (S) by laminating a first metal layer (113) and a second metal layer (114) on both sides of a polymer layer (112).

[0103] In addition, the lamination process can laminate the first metal layer (113) and the second metal layer (114) on both sides of the polymer layer (112) through deposition or lamination.

[0104]

[0105] Referring to Fig. 13, the tab forming process forms an electrode tab (111) by notching the end portion of the laminate (S).

[0106] That is, the tab forming process can form an electrode tab (111) in a protruding shape by cutting one side of a laminate (S) in which a first metal layer (113) and a second metal layer (114) are laminated on both sides of a polymer layer (112).

[0107] Additionally, the tab forming process can be performed by notching the electrode tab (111) in the laminate (S) using a punch die or laser.

[0108]

[0109] Fig. 15 is a perspective view showing a tab-breaking insertion process through a roll in a method for manufacturing an electrode current collector according to an embodiment of the present invention.

[0110] Referring to FIG. 2, FIG. 14 and FIG. 15, the wedge insertion process inserts a metal wedge (115) into at least one of the first metal layer (113) or the second metal layer (114) from the electrode tab (111) to the polymer layer (112).

[0111] The metal wedge (115) may include a first metal wedge (115a) and a second metal wedge (115b).

[0112] In addition, the wedge insertion process can insert a plurality of first metal wedges (115a) into the first metal layer (113) and a plurality of second metal wedges (115b) into the second metal layer (114).

[0113] In addition, the wedge insertion process can be performed by pressing the sheet (T) on which the metal wedge (115) is positioned through a roller (R) and inserting the metal wedge (115) positioned on the sheet (T) into at least one of the first metal layer (113) and the second metal layer (114).

[0114]

[0115] Referring to FIGS. 2, 5, and 12, the lamination process can be performed such that the thickness (t1) of the first metal layer (113) and the thickness (t2) of the second metal layer (114) are the same as in the first and second examples. Here, the lamination process can be formed by depositing the first metal layer (113) and the second metal layer (114) on both sides of the polymer layer (112).

[0116] At this time, referring to FIG. 2, the lamination process may be performed by positioning the first metal wedge (115a) and the second metal wedge (115b) parallel to each other in the lamination direction as a first example.

[0117] Meanwhile, referring to FIG. 5, the lamination process can be performed by positioning the first metal wedge (215a) and the second metal wedge (215b) in the lamination direction in the second example metal wedge (215).

[0118]

[0119] In addition, referring to FIGS. 6 and 7, the lamination process can be performed in the third and fourth examples such that the thicknesses (t3, t5) of the first metal layer (313, 413) and the thicknesses (t4, t6) of the second metal layer (314, 414) are different from each other. In addition, the lamination process can be performed such that among the first metal layer (313, 413) and the second metal layer (314, 414), a layer with a relatively thin thickness is formed through deposition, and a layer with a relatively thick thickness is formed through lamination by applying heat and pressure.

[0120] Here, referring to FIG. 6, the lamination process is a third example, and the thickness (t3) of the first metal layer (313) can be formed thicker than the thickness (t4) of the second metal layer (314). At this time, the wedge insertion process can insert a metal wedge (315) into the second metal layer (314).

[0121] Meanwhile, referring to FIG. 7, the lamination process can be formed in a fourth example, such that the thickness (t5) of the first metal layer (413) is thinner than the thickness (t6) of the second metal layer (414). At this time, the wedge insertion process can insert a metal wedge into the second metal layer (414). Here, the wedge insertion process can insert a metal wedge (415) having a height (h4) greater than the thickness (t6) of the second metal layer (414) into the second metal layer (414).

[0122]

[0123] While the present invention has been described in detail through specific examples, these are intended to illustrate the invention in detail and are not intended to be limiting. Those skilled in the art will appreciate that various implementations are possible within the technical scope of the present invention.

[0124] Additionally, the specific scope of protection of the invention will be made clear by the appended claims.

[0125]

[0126] [Explanation of symbols]

[0127] 10: Secondary batteries

[0128] 20: Pouch

[0129] 30: Electrode lead

[0130] 100: Electrode assembly

[0131] 110: Electrode current collector

[0132] 110a: positive current collector

[0133] 110b: Negative current collector

[0134] 111: Electrode tab

[0135] 112: Polymer layer

[0136] 113, 313, 413: First metal layer

[0137] 114, 314, 414: Second metal layer

[0138] 115, 115', 215, 315, 415: Metal wedges

[0139] 115a, 215a: First metal wedge

[0140] 115b, 215b: Second metal wedge

[0141] 120: Electrode active material

[0142] 120a: Positive electrode active material

[0143] 120b: Negative active material

[0144] 130: Electrode

[0145] 130a: positive pole

[0146] 130b: cathode

[0147] 140: Membrane

[0148] P: Welding area

[0149] R: Roller

[0150] S: Laminate

[0151] T: Sheet

Claims

1. An electrode current collector including an electrode tab extended at one end, It comprises a polymer layer and a first metal layer and a second metal layer laminated on both sides of the polymer layer, An electrode current collector having a metal wedge positioned in at least one of the first metal layer and the second metal layer in the electrode tab and inserted into the polymer layer.

2. In claim 1, The above metal wedge An electrode current collector comprising a plurality of first metal wedges positioned in the first metal layer and a plurality of second metal wedges positioned in the second metal layer.

3. In claim 2, An electrode current collector in which the first metal wedge and the second metal wedge are positioned parallel to each other in the stacking direction.

4. In claim 2, An electrode current collector in which the first metal wedge and the second metal wedge are positioned at a constant distance from each other.

5. In claim 2, An electrode current collector in which the first metal wedge and the second metal wedge are positioned alternately with each other in the stacking direction.

6. In claim 2, An electrode current collector in which the mutual distance between the first metal wedge and the second metal wedge is 2 to 10 um.

7. In claim 1, An electrode current collector in which the thickness of the first metal layer and the thickness of the second metal layer are formed differently from each other.

8. In claim 7, The above metal plate is an electrode current collector positioned on the second metal layer.

9. In claim 8, The thickness of the second metal layer is formed thicker than the thickness of the first metal layer, An electrode current collector in which the height of the metal plate is formed to be greater than the thickness of the second metal layer.

10. In claim 8, An electrode current collector in which the mutual distance between the above metal plate and the first metal layer is 2 to 10 um.

11. In claim 1, The above metal shackle is an electrode current collector provided in the shape of a pyramid or cone with its apex facing the polymer layer.

12. An electrode assembly in which electrodes and separators are alternately laminated, The above electrode comprises an electrode collector including an electrode tab extending from one end thereof, The above electrode collector It comprises a polymer layer in the lamination direction and a first metal layer and a second metal layer laminated on both sides of the polymer layer, An electrode assembly in which a metal wedge is positioned in at least one of the first metal layer and the second metal layer in the electrode tab and inserted into the polymer layer.

13. In claim 12, The above electrode assembly comprises a plurality of electrodes and a separator laminated together, The electrode tabs of the electrode current collectors provided on each of the plurality of electrodes are gathered together and welded, The above metal wedge is an electrode assembly positioned at the welding site of the above electrode tab.

14. A method for manufacturing an electrode collector, A lamination process for forming a laminate by laminating a first metal layer and a second metal layer on both sides of a polymer layer; A tab forming process for forming an electrode tab by notching an end portion of the above laminate; and A method for manufacturing an electrode current collector, comprising a wedge insertion process for inserting a metal wedge into at least one of the first metal layer and the second metal layer in the electrode tab up to the polymer layer.

15. In claim 14, The above lamination process is a method for manufacturing an electrode current collector by depositing the first metal layer and the second metal layer on both sides of the polymer layer.

16. In claim 14, The above lamination process is a method for manufacturing an electrode current collector in which the first metal layer and the second metal layer are laminated so that the thicknesses are different from each other.

17. In claim 16, The above lamination process is a method for manufacturing an electrode current collector, wherein a layer having a relatively thin thickness among the first metal layer and the second metal layer is formed through deposition, and a layer having a relatively thick thickness is formed through lamination by applying heat and pressure.

18. In claim 14, The above metal wedge comprises a first metal wedge and a second metal wedge, The above wedge insertion process A method for manufacturing an electrode current collector, wherein a plurality of first metal brackets are inserted into the first metal layer, and a plurality of second metal brackets are inserted into the second metal layer.

19. In claim 14, The above wedge insertion process A method for manufacturing an electrode current collector, wherein a sheet having the metal wedges positioned thereon is pressed through a roller and the metal wedges positioned on the sheet are inserted into at least one of the first metal layer and the second metal layer.

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