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KR-20260067859-A - ELECTRODE, ELECTRODE ASSEMBLY AND SECONDARY BATTERY INCLUDING SAME

KR20260067859AKR 20260067859 AKR20260067859 AKR 20260067859AKR-20260067859-A

Abstract

The present disclosure provides an electrode, an electrode assembly, and a secondary battery including the same. The electrode comprises a metal substrate, a blank portion formed at an end of the metal substrate, and a composite portion formed on a part of the metal substrate. The blank portion comprises a first cut portion and a second cut portion formed repeatedly in a first direction parallel to the winding direction of the metal substrate, and the first cut portion and the second cut portion extend along a second direction perpendicular to the first direction, the cutting length of the second cut portion is longer than that of the first cut portion, and the first cut portion may be disposed between the second cut portions.

Inventors

  • 이태윤
  • 오윤석
  • 아흐마드조노브 아크롬존
  • 김덕현
  • 장운석

Assignees

  • 삼성에스디아이 주식회사

Dates

Publication Date
20260513
Application Date
20241106

Claims (20)

  1. Metal substrate; A blank portion formed at the end of the metal substrate; and A composite portion formed on a part of the above metal substrate Includes, The above-mentioned blank portion includes a first cutting portion and a second cutting portion formed repeatedly in a first direction parallel to the winding direction of the metal substrate, and The first cutting portion and the second cutting portion extend along a second direction perpendicular to the first direction, and The cutting length of the second cutting section is longer than that of the first cutting section, and An electrode in which a first cutting portion is disposed between the second cutting portions.
  2. In paragraph 1, The above second cutting part is, Electrodes repeatedly arranged for every one or two of the first cutting sections along the first direction.
  3. In paragraph 1, The above second cutting part is, Electrodes repeatedly arranged for every three or four of the first cutting sections along the first direction.
  4. In paragraph 1, The above second cutting part is, An electrode formed to be 0.5 mm to 5 mm longer than the first cut portion.
  5. In paragraph 1, The above-mentioned part is, An electrode formed by folding the above-mentioned material while it is wound to form a plurality of tabs, and being folded at the end of the first cutting portion adjacent to the composite portion.
  6. A first electrode comprising a first composite portion coated with an active material and a first uncoated portion; A second electrode comprising a second composite portion coated with an active material and a second uncoated portion; and A separator interposed between the first electrode and the second electrode Includes, The first electrode, the second electrode, and the separator are wound around a winding axis, and The above-mentioned first part of the non-disability section is, It includes a first cutting section and a second cutting section formed repeatedly in a first direction parallel to the winding direction of the first electrode, wherein the first cutting section and the second cutting section extend along a second direction perpendicular to the first direction, the cutting length of the second cutting section is longer than that of the first cutting section, and the first cutting section is disposed between the second cutting sections. The above second non-removable part is, An electrode assembly comprising a third cutting section and a fourth cutting section formed repeatedly in a first direction parallel to the winding direction of the second electrode, wherein the third cutting section and the fourth cutting section extend along a second direction perpendicular to the first direction, the cutting length of the fourth cutting section is longer than that of the third cutting section, and the third cutting section is disposed between the fourth cutting sections.
  7. In paragraph 6, The above second cutting part is, They are repeatedly arranged along the first direction for every one or two of the first cutting sections, and The above-mentioned fourth cutting section is, An electrode assembly that is repeatedly arranged for every one or two of the third cutting sections along the first direction.
  8. In paragraph 6, The above second cutting part is, They are repeatedly arranged along the first direction for every three or four of the first cutting sections, and The above-mentioned fourth cutting section is, An electrode assembly that is repeatedly arranged every three or four of the third cutting sections along the first direction.
  9. In paragraph 6, The above second cutting part is, It is formed to be 0.5 mm to 5 mm longer than the first cutting portion, and The above-mentioned fourth cutting section is, An electrode assembly formed to be 0.5 mm to 5 mm longer than the third cut portion.
  10. An electrode assembly having a first electrode including a first non-removable portion, a second electrode including a second non-removable portion, and a separator wound thereon; A case having one side open and a through hole formed on the other side, accommodating the electrode assembly and electrically connected to the first electrode; A vent cap plate fastened to one open side of the above case; and An electrode terminal disposed through the above-mentioned through-hole and electrically connected to the second electrode. Includes, The above-mentioned first part of the non-disability section is, It includes a first cutting section and a second cutting section formed repeatedly in a first direction parallel to the winding direction of the first electrode, wherein the first cutting section and the second cutting section extend along a second direction perpendicular to the first direction, the cutting length of the second cutting section is longer than that of the first cutting section, and the first cutting section is disposed between the second cutting sections. The above second non-removable part is, A secondary battery comprising a third cutting section and a fourth cutting section formed repeatedly in a first direction parallel to the winding direction of the second electrode, wherein the third cutting section and the fourth cutting section extend along a second direction perpendicular to the first direction, the cutting length of the fourth cutting section is longer than that of the third cutting section, and the third cutting section is disposed between the fourth cutting sections.
  11. In Paragraph 10, The above-mentioned first non-removable portion and the above-mentioned second non-removable portion are A secondary battery protruding from one side of the above electrode assembly and spaced apart from each other.
  12. In Paragraph 10, The above-mentioned first non-removable portion and the above-mentioned second non-removable portion are A secondary battery arranged to expand radially from the core of the electrode assembly toward the outermost part.
  13. In Paragraph 10, The above-mentioned first non-removable portion and the above-mentioned second non-removable portion are A secondary battery in which the number of electrodes distributed in the circumferential direction increases from the core of the electrode assembly to the outermost part and is arranged in a fan shape.
  14. In Paragraph 10, A first current collector plate coupled to one end of the above case and electrically connected to the first non-removable part; A second current collector plate having one end coupled to the electrode terminal and electrically connected to the second non-electrical portion. A secondary battery that further includes
  15. In Paragraph 14, The first current collector plate and the second current collector plate are spaced apart and facing each other, A first gasket disposed between the first current collector plate and the second current collector plate to insulate the first current collector plate and the second current collector plate. A secondary battery that further includes
  16. In Paragraph 14, The above-mentioned first non-removable portion is folded while overlapping toward the above-mentioned core portion and connected to the above-mentioned first collector plate, and A secondary battery in which the second non-removable portion is folded while overlapping toward the core portion and connected to the second current collector plate.
  17. In Paragraph 10, A secondary battery further comprising a second gasket provided in the through hole and electrically insulating the case and the electrode terminal.
  18. In Paragraph 10, The above second cutting part is, They are repeatedly arranged along the first direction for every one or two of the first cutting sections, and The above-mentioned fourth cutting section is, A secondary battery that is repeatedly arranged at every one or two of the third cutting sections along the first direction.
  19. In Paragraph 10, The above-mentioned first part of the non-disability section is, The above electrode assembly is bent while in a wound state to form a plurality of first tabs, and is bent at the end of the separator adjacent to the first composite part, and The above second non-removable part is, A secondary battery in which the electrode assembly is bent while in a wound state to form a plurality of second tabs, and is bent at the end of the separator adjacent to the second composite part.
  20. In Paragraph 10, The above second cutting part is, They are repeatedly arranged along the first direction for every three or four of the first cutting sections, and The above-mentioned fourth cutting section is, A secondary battery that is repeatedly arranged every three or four of the third cutting sections along the first direction.

Description

Electrode, electrode assembly and secondary battery including the same The present disclosure relates to an electrode, an electrode assembly, and a secondary battery comprising the same. Unlike primary batteries, which cannot be recharged, secondary batteries are batteries capable of both charging and discharging. Low-capacity secondary batteries are used in small portable electronic devices such as smartphones, feature phones, laptop computers, digital cameras, and camcorders, while high-capacity secondary batteries are widely used as power sources for motor drive systems and power storage batteries in hybrid and electric vehicles. Such secondary batteries include an electrode assembly consisting of a positive electrode and a negative electrode, a case housing the assembly, and electrode terminals connected to the electrode assembly. Although rechargeable batteries are used in various environments due to their excellent electrical characteristics, conventional small batteries have had limitations in terms of designable energy density. Since the amount of electrical energy that can be stored is limited relative to the size and weight of the battery, there is a gradually increasing demand for large batteries with higher energy density in applications such as electric vehicles. Meanwhile, conventional cylindrical secondary batteries have a structure in which the positive electrode is placed on one side of the case and the negative electrode on the opposite side. In this case, components for the electrical connection between the positive and negative electrodes must be placed at both ends along the height of the case, and since the internal space of the case is not utilized to the fullest extent, there was a problem of low energy density. Additionally, because the positive and negative electrodes are separated on opposite sides, the current path becomes longer, increasing internal resistance and causing a decrease in output. The information described above disclosed in the background technology of this invention is intended only to enhance understanding of the background of the present invention and may therefore include information that does not constitute prior art. The following drawings attached to this specification illustrate preferred embodiments of the present invention and serve to further enhance understanding of the technical concept of the present invention together with the detailed description of the invention provided below; therefore, the present invention should not be interpreted as being limited only to the matters described in such drawings. FIG. 1 is a drawing showing an example of an electrode according to one embodiment of the present disclosure. Figure 2 is a drawing showing an example of an electrode with a second cutting portion added in Figure 1. Figure 3 is a drawing showing an example of an electrode with a first cutting portion added in Figure 2. FIG. 4 is a drawing showing an example of an electrode according to another embodiment of the present disclosure. FIG. 5 is a drawing showing an uncoordinated portion spaced apart from the composite portion in an electrode according to one embodiment of the present disclosure. FIG. 6 is a drawing showing an example of an electrode assembly according to one embodiment of the present disclosure. Figure 7 is a drawing showing that the second uncut portion of the electrode assembly of Figure 6 has been cut. FIG. 8 is a drawing showing an example of an electrode assembly according to one embodiment of the present disclosure, in which a first electrode and a second electrode are arranged in an alternating manner. FIG. 9 is a drawing showing an example of an electrode assembly applied to a secondary battery according to one embodiment of the present disclosure. FIG. 10 is a drawing showing the upper surface of an electrode assembly applied to a secondary battery according to one embodiment of the present disclosure. FIG. 11 is a drawing showing the lower surface of an electrode assembly applied to a secondary battery according to one embodiment of the present disclosure. FIG. 12 is a drawing showing the first and second unbent portions of an electrode assembly according to one embodiment of the present disclosure in a bent state. FIG. 13 is a cross-sectional view showing an example of a secondary battery according to one embodiment of the present disclosure. FIG. 14 is an exploded perspective view showing a part of the configuration of a secondary battery according to one embodiment of the present disclosure. FIG. 15 is a perspective view showing a partial configuration of a secondary battery according to one embodiment of the present disclosure. Figure 16 is an enlarged view of area A of Figure 13. Preferred embodiments of the present invention will be described in detail below 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 ordinar