US-20260128350-A1 - ELECTRODE ASSEMBLY AND SECONDARY BATTERY INCLUDING THE SAME

US20260128350A1US 20260128350 A1US20260128350 A1US 20260128350A1US-20260128350-A1

Abstract

An electrode assembly includes a first electrode including a first substrate and a first composite part on the first substrate, a second electrode including a second substrate and a second composite part on the second substrate, a first separator between the first electrode and the second electrode, and a winding core having a through hole and a winding of the first electrode, the second electrode, and the first separator, wherein the second substrate extends in a longitudinal direction of the second electrode, the second substrate including a winding direction non-coated part exposed from the second composite part, and wherein at least a part of the winding direction non-coated part is at a periphery of the through hole.

Inventors

Byounghwi LIM
Hyunho Cho
Soongji BOO

Assignees

SAMSUNG SDI CO., LTD.

Dates

Publication Date: 20260507
Application Date: 20250501
Priority Date: 20241105

Claims (20)

1 . An electrode assembly, comprising: a first electrode comprising a first substrate and a first composite part on the first substrate; a second electrode comprising a second substrate and a second composite part on the second substrate; a first separator between the first electrode and the second electrode; and a winding core having a through hole and a winding of the first electrode, the second electrode, and the first separator, wherein the second substrate extends in a longitudinal direction of the second electrode, the second substrate comprising a winding direction non-coated part exposed from the second composite part, and wherein at least a part of the winding direction non-coated part is at a periphery of the through hole.
2 . The electrode assembly as claimed in claim 1 , wherein the winding direction non-coated part and the first separator are stacked at the periphery of the through hole in a diameter direction.
3 . The electrode assembly as claimed in claim 1 , wherein: the first electrode is on an outer surface of the first separator, and the second electrode is on an inner surface of the first separator.
4 . The electrode assembly as claimed in claim 1 , further comprising a second separator between the first electrode and the second electrode, wherein the second separator is on an outer surface of the first electrode.
5 . The electrode assembly as claimed in claim 4 , wherein the winding direction non-coated part, the first separator, and the second separator are stacked at the periphery of the through hole in a diameter direction.
6 . The electrode assembly as claimed in claim 4 , wherein at least a part of the second separator is positioned on an outer surface of the electrode assembly.
7 . The electrode assembly as claimed in claim 4 , wherein: a winding leading end of the first separator contacts the second separator, or a winding leading end of the second separator contacts the first separator.
8 . The electrode assembly as claimed in claim 1 , wherein: a winding leading end of the winding direction non-coated part contacts the first separator, or a winding leading end of the first separator contacts the winding direction non-coated part.
9 . The electrode assembly as claimed in claim 1 , wherein the first separator and the winding direction non-coated part are between an inner surface of the second electrode and an outer surface of the first electrode.
10 . The electrode assembly as claimed in claim 4 , wherein: the second separator, the first separator, and the winding direction non-coated part are between an inner surface of the second electrode and the outer surface of the first electrode, and the second separator is in a double-layer structure.
11 . The electrode assembly as claimed in claim 4 , wherein a winding leading end of the first separator, a winding leading end of the second separator, and a winding leading end of the winding direction non-coated part are between the outer surface of the first electrode and an inner surface of the second electrode.
12 . A secondary battery, comprising: an electrode assembly comprising: a first electrode including a first substrate and a first composite part on the first substrate, a second electrode including a second substrate and a second composite part on the second substrate, a separator between the first electrode and the second electrode, and a winding core having a through hole and a winding of the first electrode, the second electrode, and the separator; and a case configured to accommodate the electrode assembly, wherein the second substrate extends in a longitudinal direction of the second electrode, the second substrate comprising a winding direction non-coated part exposed from the second composite part, and wherein at least a part of the winding direction non-coated part is at a periphery of the through hole.
13 . The secondary battery as claimed in claim 12 , wherein the winding direction non-coated part and the separator are stacked at the periphery of the through hole in a diameter direction.
14 . The secondary battery as claimed in claim 13 , further comprising a lead tab connected to the winding direction non-coated part at the periphery of the through hole.
15 . The secondary battery as claimed in claim 13 , further comprising an inserted current collector including a flat portion on the electrode assembly, and a protrusion that protrudes from the flat portion and is inserted into the through hole, wherein the protrusion of the inserted current collector is electrically connected to the second electrode by contacting the winding direction non-coated part.
16 . The secondary battery as claimed in claim 15 , wherein a height of the protrusion is greater than half of a height of the electrode assembly, and smaller than the height of the electrode assembly.
17 . The secondary battery as claimed in claim 13 , wherein: the case comprises an insertion part having an inwardly bent portion of one surface of the case to be inserted into the through hole, and the insertion part of the case is electrically connected to the second electrode by contacting the winding direction non-coated part.
18 . The secondary battery as claimed in claim 17 , wherein a height of the insertion part is greater than half of a height of the electrode assembly, and smaller than the height of the electrode assembly.
19 . A method for manufacturing an electrode assembly, the method comprising: preparing a first electrode comprising a first substrate and a first composite part positioned on the first substrate; preparing a second electrode comprising a second substrate and a second composite part positioned on the second substrate; disposing a separator between the first electrode and the second electrode; and winding the first electrode, the second electrode, and the separator, wherein the second substrate extends in a longitudinal direction of the second electrode, the second substrate comprising a winding direction non-coated part exposed from the second composite part, and wherein a winding leading end of the winding direction non-coated part contacts the separator, or a winding leading end of the separator contacts the winding direction non-coated part.
20 . The method as claimed in claim 19 , further comprising inserting an insertion bar into a through hole positioned in a winding core of the electrode assembly.

Description

CROSS-REFERENCE TO RELATED APPLICATION This application claims priority under 35 U.S.C. § 119 to Korean Patent Application No. 10-2024-0154845, filed in the Korean Intellectual Property Office on Nov. 5, 2024, the entire contents of which are hereby incorporated by reference. BACKGROUND 1. Field Embodiments include an electrode assembly and a secondary battery including the same. 2. Description of Related Art Unlike primary batteries that are not designed to be (re)charged, secondary (or rechargeable) batteries are batteries that are designed to be discharged and recharged. Low-capacity secondary batteries are used in portable, small electronic devices, such as smartphones, feature phones, notebook computers, digital cameras, and camcorders, while large-capacity secondary batteries are widely used as power sources for driving motors in hybrid vehicles and electric vehicles and for storing power (e.g., home and/or utility scale power storage). A secondary battery generally includes an electrode assembly composed of a positive electrode and a negative electrode, a case accommodating the same, and electrode terminals connected to the electrode assembly. The above information disclosed in this Background section is for the enhancement of understanding of the background of the present disclosure, and therefore, it may contain information that does not constitute related (or prior) art. SUMMARY Embodiments include an electrode assembly, including a first electrode including a first substrate and a first composite part on the first substrate, a second electrode including a second substrate and a second composite part on the second substrate, a first separator between the first electrode and the second electrode, and a winding core having a through hole and a winding of the first electrode, the second electrode, and the first separator, wherein the second substrate extends in a longitudinal direction of the second electrode, the second substrate including a winding direction non-coated part exposed from the second composite part, and wherein at least a part of the winding direction non-coated part is at a periphery of the through hole. The winding direction non-coated part and the first separator may be stacked at the periphery of the through hole in a diameter direction. The first electrode may be on an outer surface of the first separator, and the second electrode may be on an inner surface of the first separator. The electrode assembly may further include a second separator between the first electrode and the second electrode, wherein the second separator is on an outer surface of the first electrode. The winding direction non-coated part, the first separator, and the second separator may be stacked at the periphery of the through hole in a diameter direction. At least a part of the second separator may be positioned on an outer surface of the electrode assembly. A winding leading end of the first separator may contact the second separator, or a winding leading end of the second separator may contact the first separator. A winding leading end of the winding direction non-coated part may contact the first separator, or a winding leading end of the first separator may contact the winding direction non-coated part. The first separator and the winding direction non-coated part may be between an inner surface of the second electrode and an outer surface of the first electrode. The second separator, the first separator, and the winding direction non-coated part may be between an inner surface of the second electrode and the outer surface of the first electrode, and the second separator may be in a double-layer structure. A winding leading end of the first separator, a winding leading end of the second separator, and a winding leading end of the winding direction non-coated part may be between the outer surface of the first electrode and an inner surface of the second electrode. Embodiments include a secondary battery, including an electrode assembly including a first electrode including a first substrate and a first composite part on the first substrate, a second electrode including a second substrate and a second composite part on the second substrate, a separator between the first electrode and the second electrode, and a winding core having a through hole and a winding of the first electrode, the second electrode, and the separator, and a case configured to accommodate the electrode assembly, wherein the second substrate extends in a longitudinal direction of the second electrode, the second substrate including a winding direction non-coated part exposed from the second composite part, and wherein at least a part of the winding direction non-coated part is at a periphery of the through hole. The winding direction non-coated part and the separator may be stacked at the periphery of the through hole in a diameter direction. The secondary battery may further include a lead tab connected to the winding direction non-co