KR-20260063816-A - ELECTRODE ASSEMBLY

KR20260063816AKR 20260063816 AKR20260063816 AKR 20260063816AKR-20260063816-A

Abstract

The technical concept of the present invention provides an electrode assembly comprising: a laminate including a plurality of first electrodes stacked in a vertical direction; and a first conductive jig connected to the electrode tabs of the plurality of first electrodes, wherein the plurality of first electrodes includes a first lowest electrode located at the bottom among the plurality of first electrodes, a first uppermost electrode located at the top among the plurality of first electrodes, and a first intermediate electrode provided between the first lowest electrode and the first uppermost electrode, and wherein the first conductive jig is bonded to the electrode tab of the first lowest electrode and the electrode tab of the first uppermost electrode, and the electrode tab of the first intermediate electrode is in contact with the first conductive jig in a folded form.

Inventors

조영수
유광호
김수환
김동윤
이성원
엄탁건
이승현
홍지수

Assignees

주식회사 엘지에너지솔루션

Dates

Publication Date: 20260507
Application Date: 20241031

Claims (15)

A laminate comprising a plurality of first electrodes stacked in a vertical direction; and A first conductive jig connected to the electrode tabs of the plurality of first electrodes; Includes, The plurality of first electrodes includes a first lowest electrode located at the lowest of the plurality of first electrodes, a first uppermost electrode located at the uppermost of the plurality of first electrodes, and a first intermediate electrode provided between the first lowest electrode and the first uppermost electrode. The first conductive jig is bonded to the electrode tab of the first lowest electrode and the electrode tab of the first uppermost electrode, and An electrode assembly in which the electrode tab of the first intermediate electrode is in contact with the first conductive jig in a bent form.
In Article 1, The above-mentioned first conductive jig is, A first connecting plate comprising an inner surface facing the laminate and an outer surface opposite to the inner surface; and A first lead plate extending outwardly from the outer surface of the first connecting plate; An electrode assembly characterized by including
In Article 2, An electrode assembly characterized in that the electrode tab of the first lowest electrode and the electrode tab of the first uppermost electrode are in contact with the outer surface of the first connecting plate.
In Paragraph 3, The electrode tab of the first lowest electrode has a bent shape extending along the bottom surface and the outer surface of the first connecting plate, An electrode assembly characterized in that the electrode tab of the first uppermost electrode has a bent shape extending along the upper surface and the outer surface of the first connecting plate.
In Paragraph 3, The electrode tab of the first lowest electrode has a joint joined to the outer surface of the first connecting plate, An electrode assembly characterized in that the electrode tab of the first uppermost electrode has a joint joined to the outer surface of the first connecting plate.
In Article 2, An electrode assembly characterized in that the electrode tab of the first intermediate electrode is in contact with the inner surface of the first connecting plate.
In Article 1, An electrode assembly characterized in that at least two of the electrode tabs of the first lowest electrode, the electrode tab of the first uppermost electrode, and the electrode tab of the first intermediate electrode are spaced apart in the horizontal direction.
In Article 1, The electrode tab of the first lowest electrode and the electrode tab of the first uppermost electrode are welded to the first conductive jig to form an integral part with the first conductive jig, and An electrode assembly characterized in that the electrode tab of the first intermediate electrode is bent by being pressed against the first conductive jig.
In Article 1, The above laminate further includes a plurality of second electrodes stacked in the vertical direction, Among the plurality of second electrodes, two adjacent second electrodes are spaced apart with one of the plurality of first electrodes in between, The electrode assembly further includes a second conductive jig connected to the electrode tabs of the plurality of second electrodes, and The plurality of second electrodes includes a second lowest electrode located at the lowest of the plurality of second electrodes, a second uppermost electrode located at the uppermost of the plurality of second electrodes, and a second intermediate electrode provided between the second lowest electrode and the second uppermost electrode. The second conductive jig is bonded to the electrode tab of the second lowest electrode and the electrode tab of the second uppermost electrode, and An electrode assembly characterized in that the electrode tab of the second intermediate electrode is in contact with the second conductive jig in a bent form.
In Article 9, The above second conductive jig is, A second connecting plate comprising an inner surface facing the laminate and an outer surface opposite to the inner surface; and A second lead plate extending outwardly from the outer surface of the second connecting plate; An electrode assembly characterized by including
In Article 10, The electrode tab of the second lowest electrode is in contact with the outer surface of the second connecting plate, and The electrode tab of the second uppermost electrode is in contact with the outer surface of the second connecting plate, and An electrode assembly characterized in that the electrode tab of the second intermediate electrode is in contact with the inner surface of the second connecting plate.
In Article 10, The electrode tab of the second lowest electrode has a bent shape extending along the bottom surface and the outer surface of the second connecting plate, An electrode assembly characterized in that the electrode tab of the second uppermost electrode has a bent shape extending along the upper surface and the outer surface of the second connecting plate.
In Article 10, The electrode tab of the second lowest electrode has a joint joined to the outer surface of the second connecting plate, An electrode assembly characterized in that the electrode tab of the second uppermost electrode has a joint joined to the outer surface of the second connecting plate.
In Article 9, An electrode assembly characterized in that at least two of the electrode tabs of the second lowest electrode, the electrode tab of the second uppermost electrode, and the electrode tab of the second intermediate electrode are spaced apart in the horizontal direction.
In Article 9, The electrode tab of the second lowest electrode and the electrode tab of the second uppermost electrode are welded to the second conductive jig to form an integral part with the second conductive jig, and An electrode assembly characterized in that the electrode tab of the second intermediate electrode is bent by being pressed against the second conductive jig.

Description

Electrode Assembly The present invention relates to an electrode assembly for a secondary battery. Unlike primary batteries, secondary batteries are capable of multiple charge-discharge cycles. Secondary batteries are widely used as energy sources for various wireless devices, such as handsets, laptops, and cordless vacuum cleaners. A secondary battery may include an electrode assembly disposed within a battery case, and the electrode assembly may include multiple negative electrodes, multiple positive electrodes, and a separator. The electrode assembly has a stacked structure in which negative electrodes and positive electrodes are alternately stacked, and the separator is disposed between the negative electrodes and the positive electrodes. FIG. 1 is a cross-sectional view showing an electrode assembly according to exemplary embodiments. FIG. 2 is a perspective view showing a first conductive jig provided in an electrode assembly according to exemplary embodiments. FIG. 3 is a side view showing one side of an electrode assembly according to exemplary embodiments. FIG. 4 is a side view showing the other side of an electrode assembly according to exemplary embodiments. FIGS. 5a to 5c are cross-sectional views illustrating a method for manufacturing an electrode assembly according to exemplary embodiments. Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. Prior to this, terms and words used in this specification and claims should not be interpreted as being limited to their ordinary or dictionary meanings. Instead, based on the principle that the inventor can appropriately define the concepts of terms to best describe his invention, they should be interpreted in a meaning and concept consistent with the technical spirit of the present invention. Therefore, the embodiments described in this specification and the configurations illustrated in the drawings are merely the most preferred embodiments of the present invention and do not represent all of the technical ideas of the present invention; thus, it should be understood that various equivalents and modifications that can replace them may exist at the time of filing this application. In addition, in describing the present invention, if it is determined that a detailed description of related known components or functions may obscure the essence of the invention, such detailed description is omitted. Since embodiments of the present invention are provided to more fully explain the invention to those skilled in the art, the shapes and sizes of the components in the drawings may be exaggerated, omitted, or schematically depicted for clearer explanation. Accordingly, the size or proportion of each component does not entirely reflect the actual size or proportion. (1st embodiment) FIG. 1 is a cross-sectional view showing an electrode assembly (10) according to exemplary embodiments. FIG. 2 is a perspective view showing a first conductive jig (210) provided in an electrode assembly (10) according to exemplary embodiments. FIG. 3 is a side view showing one side of an electrode assembly (10) according to exemplary embodiments. FIG. 4 is a side view showing the other side of an electrode assembly (10) according to exemplary embodiments. Referring to FIGS. 1 to 4, the electrode assembly (10) may include a laminate (100), a first conductive jig (210), and a second conductive jig (220). A laminate (100) may include a plurality of electrodes (101) and a separator (130). The laminate (100) may have a laminated structure in which a plurality of electrodes (101) are stacked in a vertical direction (e.g., Z-axis direction). Each individual electrode (101) may have a flat plate shape extending approximately in a first horizontal direction (e.g., X-axis direction) and a second horizontal direction (e.g., Y-axis direction). A plurality of electrodes (101) may be spaced apart from each other by a separator (130). A separator (130) may be interposed between two electrodes (101) that are adjacent in a vertical direction (e.g., Z-axis direction) among the plurality of electrodes (101). In exemplary embodiments, the laminate (100) may include a plurality of separators (130), and each of the separators (130) may be interposed between two electrodes (101) that are adjacent in a vertical direction (e.g., Z-axis direction). Each individual electrode (101) may correspond to a positive electrode or a negative electrode. The above-mentioned positive electrode may include a positive current collector and a positive active material coated on the positive current collector. For example, the positive current collector may include aluminum, nickel, titanium, and/or stainless steel. The positive active material is a material capable of causing an electrochemical reaction. The positive active material may include a lithium transition metal oxide. The positive active material may include, for example, a layered compound