Electrode assembly and secondary battery including the same

Patent metadata

Field	Value
Publication number	US-2025030034-A1
Application number	US-202418608313-A
Country	US
Kind code	A1
Filing date	Mar 18, 2024
Priority date	Jul 21, 2023
Publication date	Jan 23, 2025
Grant date	—

Abstract

A wound-type electrode assembly including a first electrode, a separator, and a second electrode, where the first electrode may include a substrate, an active material layer on at least one surface of the substrate, a first functional layer spaced apart from the active material layer by a predetermined distance and on the substrate, a finishing tape attached to an upper surface of the first functional layer, one surface of the substrate exposed between the active material layer and the first functional layer, and an upper surface of the active material layer.

First claim

What is claimed is:

1 . A wound-type electrode assembly comprising a first electrode, a separator, and a second electrode, wherein the first electrode comprises:
a substrate; an active material layer on at least one surface of the substrate; a first functional layer spaced apart from the active material layer by a predetermined distance and on the substrate; a finishing tape attached to an upper surface of the first functional layer, one surface of the substrate exposed between the active material layer and the first functional layer, and an upper surface of the active material layer.

2 . The electrode assembly of claim 1 , wherein the first functional layer comprises a ceramic material.

3 . The electrode assembly of claim 1 , further comprising a second functional layer between the substrate and the active material layer.

4 . The electrode assembly of claim 3 , wherein the second functional layer extends outside the active material layer and is covered with the finishing tape.

5 . The electrode assembly of claim 4 , wherein the second functional layer extends 1 mm to 5 mm outside the active material layer.

6 . The electrode assembly of claim 1 , wherein an interval between an end portion of the first functional layer and an end portion of a second functional layer is 2 mm to 3 mm.

7 . The electrode assembly of claim 1 , wherein a length of the finishing tape is 9 mm to 10 mm.

8 . The electrode assembly of claim 1 , wherein a width of the finishing tape is greater than or equal to the width of the separator.

9 . The electrode assembly of claim 1 , wherein:
the electrode assembly comprises a curved portion and a flat portion; and the finishing tape is provided in the curved portion.

10 . The electrode assembly of claim 2 , wherein, in a state in which the electrode assembly is wound, the finishing tape is provided at both sides of an electrode uncoated region provided at a distal end of the second electrode.

11 . A secondary battery, comprising:
the electrode assembly of claim 1 ; and a case accommodating the electrode assembly and electrolyte solution.

Assignees

• Samsung Sdi Co Ltd

Inventors

• Lee Dong Myung
• Ha Jaehwan
• Kim Duckhyun
• Yoo Heeeun

Classifications

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M50/105

  Pouches or flexible bags · CPC title

• H01M50/595

  Tapes · CPC title

• H01M4/667

  in the form of layers, e.g. coatings · CPC title

• H01M10/0431 Primary

  Cells with wound or folded electrodes (H01M10/045 takes precedence) · CPC title