KR-20260067033-A - Cylindrical secondary battery with current collector

Abstract

A cylindrical secondary battery is disclosed. A cylindrical secondary battery according to one aspect of the present invention comprises: a housing; an electrode assembly accommodated in the housing and comprising a negative electrode, a positive electrode, and a separator; and a current collector electrically connected to the positive electrode, wherein the current collector may include: a body portion; a plurality of contact portions extending from the body portion and spaced apart from each other and having a spaced-apart space; and a connecting portion extending from the body portion and contacting a cover electrically connected to the outside.

Inventors

• 류광지
• 정주식
• 김대중
• 박윤수
• 송현준
• 박재윤
• 김현석

Assignees

• 주식회사 금양

Dates

Publication Date

20260512

Application Date

20241105

Claims (7)

1. Housing; An electrode assembly housed in the above housing and comprising a cathode, an anode, and a separator; and It includes a current collector electrically connected to the above positive electrode, The entire house mentioned above is, Body part; A plurality of contact portions extending from the above body portion and spaced apart from each other to have a spaced-apart space; and A cylindrical secondary battery including a connecting portion that extends from the body portion and contacts a cover electrically connected to the outside.
2. In Article 1, The above electrode assembly is, The above-mentioned positive electrode protrudes in a protruding region; and Formed between the above protruding regions, and having a folded notch region on the anode, A cylindrical secondary battery in which the plurality of contact portions are in contact with the positive electrode of the notch region.
3. In Article 2, The above-mentioned spacing corresponds to the above-mentioned protruding area, a cylindrical secondary battery.
4. In Paragraph 3, The above plurality of contact parts are, First contact part; A second contact portion spaced apart from the first contact portion; A third contact portion disposed on the opposite side of the first contact portion with the above body portion in between; and A cylindrical secondary battery comprising a fourth contact portion positioned on the opposite side of the second contact portion with the body portion in between.
5. In Paragraph 4, The above connecting portion is a cylindrical secondary battery disposed between the first contact portion and the fourth contact portion.
6. In Paragraph 4, The first contact portion and the third contact portion are formed symmetrically with respect to each other, and A cylindrical secondary battery in which the second contact portion and the fourth contact portion are formed symmetrically with respect to each other.
7. In Article 1, A cylindrical secondary battery in which the area of the plurality of contact portions increases as it moves away from the body portion.

Description

Cylindrical secondary battery with current collector The present invention relates to battery technology, and more specifically, to a cylindrical secondary battery including a current collector that improves the performance of a cylindrical secondary battery mounted in a vehicle. Generally, batteries are classified according to the shape of the battery case into cylindrical batteries, in which the electrode assembly is housed in a cylindrical housing; prismatic batteries, in which the electrode assembly is housed in a prismatic housing; and pouch-type batteries, in which the electrode assembly is housed in a pouch-type case made of aluminum laminate sheets. Furthermore, the electrode assembly is a device capable of charging and discharging, comprising an anode, a cathode, and a separator structure disposed between the anode and the cathode. Such an electrode assembly is classified into a jelly-roll type, in which a separator is disposed between long sheet-type anodes and cathodes coated with active material and wound, and a stack type, in which a plurality of anodes and cathodes of a predetermined size are sequentially stacked with a separator interposed between them. In particular, jelly-roll type electrode assemblies have the advantages of being easy to manufacture and having a high energy density per unit weight. In addition, jelly-roll type electrode assemblies with high energy density are embedded in a cylindrical housing to form a cylindrical secondary battery, and cylindrical secondary batteries are used in fields requiring the application of high-capacity secondary batteries, such as electric vehicles and electric bicycles. And, as illustrated in FIGS. 1 to 3, this jelly-roll type electrode assembly (10) is provided with a negative tab (14, 15) and a positive tab (13) for electrically connecting to the outside. However, the positive tab (13) only comes into contact with some of the positives, so there is a problem in that power cannot be transferred quickly during the process of transferring power from the battery to the outside. FIG. 1 is a perspective view schematically showing the appearance of an electrode assembly of a conventional cylindrical secondary battery. FIG. 2 is a schematic perspective view of the exterior of an electrode assembly of a conventional cylindrical secondary battery from a different side. FIG. 3 is a side view schematically showing the appearance of an electrode assembly of a conventional cylindrical secondary battery. FIG. 4 is a drawing showing an electrode assembly of a cylindrical secondary battery according to an embodiment of the present invention housed in a housing. FIG. 5 is a drawing showing a current collector mounted in a housing while an electrode assembly of a cylindrical secondary battery according to an embodiment of the present invention is accommodated in a housing. FIG. 6 is a plan view showing a current collector of a cylindrical secondary battery according to an embodiment of the present invention. FIG. 7 is a drawing showing the positive electrode of a cylindrical secondary battery according to an embodiment of the present invention. FIG. 8 is a drawing showing the current collector of a cylindrical secondary battery according to an embodiment of the present invention with the positive electrode seated thereon. FIG. 9 is a drawing showing a positive terminal being coupled to a current collector of a cylindrical secondary battery according to an embodiment of the present invention. FIG. 10 is a drawing showing the positive terminal of a cylindrical secondary battery according to an embodiment of the present invention sealing the upper side of the housing. Figure 11 is an enlarged view of A shown in Figure 10. FIG. 12 is a drawing showing the positive terminal of a cylindrical secondary battery being pressed according to an embodiment of the present invention. Hereinafter, embodiments of the present invention are described in detail with reference to the attached drawings so that those skilled in the art can easily implement the invention. The present invention may be embodied in various different forms and is not limited to the embodiments described herein. To clearly explain the present invention, parts unrelated to the description in the drawings have been omitted, and the same reference numerals have been used throughout the specification for identical or similar components. The words and terms used in this specification and claims are not limited to their ordinary or dictionary meanings, but should be interpreted in a meaning and concept consistent with the technical spirit of the invention in accordance with the principles by which the inventor defines terms and concepts to best describe his invention. Therefore, the embodiments described in this specification and the configurations illustrated in the drawings correspond to preferred embodiments of the present invention and do not represent all technical concepts of the present invention; thus, va