KR-20260066844-A - ELECTRODE ASSEMBLY AND SECONDARY BATTERY COMPRISING THE SAME

Abstract

The present disclosure relates to an electrode assembly and a secondary battery comprising the same. The electrode assembly comprises a first electrode comprising a first substrate and a first composite portion disposed on the first substrate, a second electrode comprising a second substrate and a second composite portion disposed on the second substrate, a first separator interposed between the first electrode and the second electrode, and a through hole located in a winding core formed by the wound first electrode, the second electrode, and the first separator, wherein the second substrate extends in the longitudinal direction of the second electrode and includes a winding direction unwound portion exposed from the second composite portion, and at least a portion of the winding direction unwound portion may be disposed around the through hole.

Inventors

• 임병휘
• 조현호
• 부숭지

Assignees

• 삼성에스디아이 주식회사

Dates

Publication Date

20260512

Application Date

20241105

Claims (20)

1. A first electrode comprising a first substrate and a first composite portion disposed on the first substrate; A second electrode comprising a second substrate and a second composite portion disposed on the second substrate; A first separator interposed between the first electrode and the second electrode; and A through hole located in the core portion formed by the wound first electrode, the second electrode, and the first separator. Includes, The second material above extends in the longitudinal direction of the second electrode and includes a winding direction unwound portion exposed from the second composite portion, and An electrode assembly in which at least a portion of the above-mentioned winding direction unwound portion is disposed around the through hole.
2. In paragraph 1, An electrode assembly in which the winding direction non-reinforced portion and the first separator are stacked in the diameter direction around the circumference of the above-mentioned through hole.
3. In paragraph 1, The first electrode is disposed on the outer surface of the first separator, and An electrode assembly in which the second electrode is disposed on the inner surface of the first separator.
4. In paragraph 1, It further includes a second separator disposed interposed between the first electrode and the second electrode, and The second separator is an electrode assembly disposed on the outer surface of the first electrode.
5. In paragraph 4, An electrode assembly in which the winding direction non-retaining portion, the first separator, and the second separator are stacked in the diameter direction around the circumference of the through hole.
6. In paragraph 4, An electrode assembly in which at least a portion of the second separator is disposed on the outer surface of the electrode assembly.
7. In paragraph 4, The winding tip of the first separator above comes into contact with the second separator, or The winding tip of the second separator above is an electrode assembly in contact with the first separator.
8. In paragraph 1, The winding tip of the above-mentioned winding direction non-winding portion contacts the above-mentioned first separator, or The winding tip of the first separator above is an electrode assembly in contact with the unwound portion in the winding direction above.
9. In paragraph 1, An electrode assembly in which the first separator and the winding direction non-removable portion are disposed between the inner surface of the second electrode and the outer surface of the first electrode.
10. In paragraph 4, The second separator, the first separator, and the winding direction unwound portion are disposed between the inner surface of the second electrode and the outer surface of the first electrode, and The above second separator is an electrode assembly arranged in two layers.
11. In paragraph 4, An electrode assembly in which the winding tip of the first separator, the winding tip of the second separator, and the winding tip of the unwound portion in the winding direction are disposed between the outer surface of the first electrode and the inner surface of the second electrode.
12. An electrode assembly comprising a first electrode including a first substrate and a first composite portion disposed on the first substrate, a second electrode including a second substrate and a second composite portion disposed on the second substrate, a separator interposed between the first electrode and the second electrode, and a through hole located in a wound core formed by the wound first electrode, the second electrode and the separator; and A case accommodating the above electrode assembly Includes, The second material above extends in the longitudinal direction of the second electrode and includes a winding direction unwound portion exposed from the second composite portion, and A secondary battery in which at least a portion of the above-mentioned winding direction unwound portion is disposed around the through hole.
13. In Paragraph 12, A secondary battery in which the winding direction unwound portion and the separator are laminated in the diameter direction around the circumference of the through hole.
14. In Paragraph 13, A secondary battery further comprising a lead tab connected to the winding direction blank portion disposed around the through hole.
15. In Paragraph 13, An insertion current collector comprising a flat portion disposed on the electrode assembly and a protrusion protruding from the flat portion and inserted into the through hole. Includes more, A secondary battery in which the protrusion of the above-mentioned insertion current collector contacts the above-mentioned winding direction non-removable portion and is electrically connected to the second electrode.
16. In paragraph 15, A secondary battery in which the height of the above protrusion is greater than 1/2 of the height of the above electrode assembly and is smaller than the height of the above electrode assembly.
17. In Paragraph 13, The above case includes an insertion portion formed such that a portion of one side of the case is bent inward to be inserted into the through hole. A secondary battery in which the insert portion of the above case contacts the unwound portion in the winding direction and is electrically connected to the second electrode.
18. In Paragraph 17, A secondary battery in which the height of the insertion portion is greater than 1/2 of the height of the electrode assembly and smaller than the height of the electrode assembly.
19. A step of preparing a first electrode comprising a first substrate and a first composite portion disposed on the first substrate; A step of preparing a second electrode comprising a second substrate and a second composite portion disposed on the second substrate; A step of interposing a separator between the first electrode and the second electrode; and The step of winding the first electrode, the second electrode, and the separator. Includes, The second material above extends in the longitudinal direction of the second electrode and includes a winding direction unwound portion exposed from the second composite portion, and A method for manufacturing an electrode assembly in which the winding tip of the unwound portion in the winding direction contacts the separator, or the winding tip of the separator contacts the unwound portion in the winding direction.
20. In Paragraph 19, Step of inserting an insertion rod into a through hole located in the core of the electrode assembly. A method for manufacturing an electrode assembly, further comprising

Description

Electrode assembly and secondary battery comprising the same The present disclosure relates to an electrode assembly in which a portion of the unoccupied portion is disposed around a through hole, 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. The electrode assembly of a secondary battery can be formed by winding a positive electrode and a negative electrode. Typically, the area surrounding the core of the electrode assembly consists of a separator, resulting in low rigidity. Consequently, the electrode assembly may be deformed by external impacts to the secondary battery. Additionally, an electrode tab may be formed on the outer side of the electrode assembly. There is a problem where the energy density of the secondary battery is reduced due to the electrode tab and the space required by 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 cross-sectional view showing an example of a secondary battery according to one embodiment of the present disclosure. FIG. 2 is a drawing showing an example of winding a first electrode, a second electrode, a first separator, and a second separator according to one embodiment of the present disclosure. FIG. 3 is a drawing showing an example of a first electrode, a second electrode, a first separator, and a second separator wound according to one embodiment of the present disclosure. FIG. 4 is a partially enlarged drawing of an example of an electrode assembly according to one embodiment of the present disclosure. FIG. 5 is a drawing showing a part of an example of an electrode assembly according to one embodiment of the present disclosure. FIG. 6 is a drawing showing the appearance of an electrode assembly before a through hole is formed according to one embodiment of the present disclosure. FIG. 7 is a drawing showing the through hole formed in an electrode assembly according to one embodiment of the present disclosure. FIG. 8 is a cross-sectional view showing an example of a secondary battery including an insertable current collector according to one embodiment of the present disclosure. FIG. 9 is a cross-sectional view showing an example of a secondary battery including a case according to one embodiment of the present disclosure. FIG. 10 is a flowchart illustrating an example of a method for manufacturing an electrode assembly 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 dimensio