KR-20260067775-A - ELECTRODE ASSEMBLY AND SECONDARY BATTERY INCLUDING SAME

Abstract

The present disclosure provides an electrode assembly and a secondary battery. An electrode assembly according to the present disclosure includes a first electrode connected to a first electrode tab, a second electrode connected to a second electrode tab, and a separator interposed between the first electrode and the second electrode. The first electrode, the separator, and the second electrode are sequentially stacked and wound, and include a wound core having a center hole formed in the wound state and an outer portion connected to the wound core. The length of the wound core in the direction of the winding axis may be different from the length of the outer portion in the direction of the winding axis.

Inventors

• 조성민

Assignees

• 삼성에스디아이 주식회사

Dates

Publication Date

20260513

Application Date

20241106

Claims (20)

1. A first electrode connected to a first electrode tab; A second electrode connected to a second electrode tab; and A separator interposed between the first electrode and the second electrode Includes, The first electrode, the separator, and the second electrode are, It is sequentially stacked and wound, and includes a wound core having a center hole formed in the wound state and an outer part connected to the wound core, and An electrode assembly in which the length of the core portion in the direction of the winding axis is different from the length of the outer portion in the direction of the winding axis.
2. In paragraph 1, The above outer part is, A first outer portion connected to the above-mentioned core portion; and A second outer part connected to the first outer part above Includes, The length of the first outer portion in the direction of the winding axis is smaller than the length of the core portion in the direction of the winding axis, and An electrode assembly in which the length of the second outer portion in the direction of the winding axis is smaller than the length of the first outer portion in the direction of the winding axis.
3. In paragraph 2, The first electrode tab and the second electrode tab are electrode assemblies protruding from the first outer portion.
4. In paragraph 2, The above electrode assembly is, A first outer surface formed by the above-mentioned core; A second outer surface formed by the first outer portion; and The third outer surface formed by the second outer part An electrode assembly comprising
5. In paragraph 4, The upper end of the above-mentioned core, the upper end of the above-mentioned first outer part, and the upper end of the above-mentioned second outer part are parallel to each other, and The first outer surface is perpendicular to the upper end of the core portion and the upper end of the first outer portion, and The above second outer surface is an electrode assembly perpendicular to the upper end of the first outer portion and the upper end of the second outer portion.
6. In paragraph 4, The upper end of the above-mentioned core, the upper end of the above-mentioned first outer part, and the upper end of the above-mentioned second outer part are parallel to each other, and The first outer surface and the second outer surface are inclined outwardly in the radial direction of the electrode assembly, electrode assembly.
7. Electrode assembly; A cylindrical case accommodating the above electrode assembly; A cap plate for sealing the opening of the above-mentioned cylindrical case; and A gasket interposed between the above cap plate and the above cylindrical case Includes, The above electrode assembly is, A first electrode connected to a first electrode tab; A second electrode connected to a second electrode tab; and A separator interposed between the first electrode and the second electrode Includes, The first electrode, the separator, and the second electrode are, It is sequentially stacked and wound, and includes a wound core having a center hole formed in the wound state and an outer part connected to the wound core, and A secondary battery in which the length of the core portion in the direction of the winding axis is greater than the length of the outer portion in the direction of the winding axis.
8. In Paragraph 7, The above cap plate is, A first flat portion located at the center and protruding in the opposite direction to the direction in which the electrode assembly housed within the cylindrical case is located; A second flat section located on the outer side of the first flat section; and A secondary battery comprising a connecting portion located between the first flat portion and the second flat portion.
9. In paragraph 8, The above connecting portion is inclined radially outward of the cylindrical case, a secondary battery.
10. In paragraph 8, The above cap plate includes a notch formed on the lower surface of the second flat portion, a secondary battery.
11. In paragraph 8, The above outer part is, A first outer portion connected to the above-mentioned core portion; and A second outer part connected to the first outer part above Includes, The length of the first outer portion in the direction of the winding axis is smaller than the length of the core portion in the direction of the winding axis, and A secondary battery in which the length of the second outer portion in the direction of the winding axis is smaller than the length of the first outer portion in the direction of the winding axis.
12. In Paragraph 11, The first electrode tab above is, A secondary battery protruding from the first outer portion and connected to the second flat portion of the cap plate.
13. In Paragraph 11, The above second electrode tab is, A secondary battery protruding from the first outer portion and connected to the bottom portion of the cylindrical case.
14. In Paragraph 7, An insulating member interposed between the above cap plate and the above electrode assembly A secondary battery that further includes
15. In Paragraph 11, The above electrode assembly is, A first outer surface formed by the above-mentioned core; A second outer surface formed by the first outer portion; and The third outer surface formed by the second outer part A secondary battery including
16. In paragraph 15, The upper end of the above-mentioned core, the upper end of the above-mentioned first outer part, and the upper end of the above-mentioned second outer part are parallel to each other, and The first outer surface is perpendicular to the upper end of the core portion and the upper end of the first outer portion, and A secondary battery in which the second outer surface is perpendicular to the upper end of the first outer portion and the upper end of the second outer portion.
17. In paragraph 15, The upper end of the above-mentioned core, the upper end of the above-mentioned first outer part, and the upper end of the above-mentioned second outer part are parallel to each other, and A secondary battery in which the first outer surface and the second outer surface are inclined radially outwardly to the electrode assembly.
18. In Paragraph 11, A secondary battery in which the upper end of the above-mentioned core portion is higher than the lower end of the above-mentioned second flat portion of the above-mentioned cap plate.
19. In Paragraph 11, A secondary battery in which the upper part of the first outer portion is higher than the lower part of the gasket.
20. In Paragraph 11, A secondary battery in which the longest diameter of the first outer portion is smaller than the diameter of the circle formed by the inner circumference of the gasket.

Description

Electrode assembly and secondary battery including the same The present disclosure relates to 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. In the context of rechargeable batteries, energy density refers to the amount of energy that can be stored per unit volume. Rechargeable batteries with high energy density can provide increased operating time or driving range in portable devices or electric vehicles. Accordingly, energy density is recognized as one of the key factors determining the performance of rechargeable batteries, and various efforts have been made to improve it. 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 perspective view showing an example of a secondary battery according to one embodiment of the present disclosure. FIG. 2 is a cross-sectional view showing an example of a secondary battery according to one embodiment of the present disclosure. FIG. 3 is a drawing showing an example of a winding front/rear electrode assembly according to one embodiment of the present disclosure. FIG. 4 is a cross-sectional view showing an example of an electrode assembly according to one embodiment of the present disclosure. FIG. 5 is a drawing showing an example of a winding front/rear electrode assembly according to one embodiment of the present disclosure. FIG. 6 is a cross-sectional view showing an example of an electrode assembly according to one embodiment of the present disclosure. FIG. 7 is a perspective view showing an example of an insulating member according to one embodiment of the present disclosure. FIG. 8 is a perspective view showing an example of an insulating member according to one embodiment of the present disclosure. FIG. 9 is a perspective view showing an example of a cap plate according to one embodiment of the present disclosure. FIG. 10 is a cross-sectional view showing an example of a cap plate according to one embodiment of the present disclosure. FIG. 11 is a cross-sectional view showing an example of the upper portion of a secondary battery according to one embodiment of the present disclosure. FIG. 12 is a cross-sectional view showing an example of the upper portion of a secondary battery according to one embodiment of the present disclosure. 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 ordinary or dictionary meanings. Instead, based on the principle that the inventor can appropriately define the concepts of terms to best describe their 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 some of the most preferred embodiments of the present invention and do not represent all of the technical spirit of the present invention. It should be understood that various equivalents and modifications capable of replacing them may exist at the time of filing this application. Additionally, as used herein, “comprise, include” and/or “comprising, including” specify the presence of the mentioned features, numbers, steps, actions, parts, elements, and/or groups thereof, and do not exclude the presence or addition of one or more other features, numbers, actions, parts, elements, and/or groups. Additionally, to aid in understanding the invention, the attached drawings are not drawn to actual scale, and the dimensions of some components may be exaggerated. Furthermore, the same reference numerals may be assigned to identical components in diff