Electrode assembly

Patent metadata

Field	Value
Publication number	US-11545725-B2
Application number	US-201916759895-A
Country	US
Kind code	B2
Filing date	Jul 22, 2019
Priority date	Sep 19, 2018
Publication date	Jan 3, 2023
Grant date	Jan 3, 2023

Abstract

The present invention provides an electrode assembly in which a negative electrode coated with a negative electrode active material on a surface of a negative electrode collector, a separator, and a positive electrode coated with a positive electrode active material on a surface of a positive electrode collector are repeatedly laminated, the electrode assembly comprising: monocells in which the positive electrode, the separator, the negative electrode, and the separator are laminated, wherein at least two or more monocells are laminated, wherein, in any one of the monocells, an expansion part extending lengthily to one side is formed on the separators, and the expansion part of the separator surrounds the monocells laminated to be disposed at the outermost layers to fix the laminated monocells.Furthermore, the present invention provides an electrode assembly in which a negative electrode coated with a negative electrode active material on a surface of a negative electrode collector, a separator, and a positive electrode coated with a positive electrode active material on a surface of a positive electrode collector are repeatedly laminated, the electrode assembly comprising: monocells in which the positive electrode, the separator, the negative electrode, and the separator are sequentially laminated, wherein at least two or more monocells are laminated, wherein each of the two or more monocells of the monocells comprises a positive electrode extension part, in which a positive electrode collector extends lengthily to one side, and a negative electrode extension part, in which a negative electrode collector extends lengthily to the other side, and the positive electrode extension part and the negative electrode extension part are respectively bonded to a positive electrode extension part and a negative electrode extension part to fix the laminated monocells.

First claim

The invention claimed is:

1. An electrode assembly, comprising:
two or more monocells laminated to each other, each monocell consisting of a positive electrode, a first separator, a negative electrode, and a second separator that are sequentially laminated,
wherein in one of the monocells, an expansion part extending laterally to one side of the monocell is formed from one of the first separators that extends between the positive electrode and the negative electrode of the one of the monocells, and the expansion part wraps around the monocells to be disposed at uppermost and lowermost layers of the electrode assembly, the expansion part fixing the monocells to each other.

2. The electrode assembly of claim 1 , wherein the monocell comprising the expansion part is a monocell disposed at the uppermost or lowermost layer of the electrode assembly, and
the separator comprising the expansion part is the first separator disposed between the positive electrode and the negative electrode of the one of the monocells.

3. The electrode assembly of claim 1 , wherein each of the monocells has a rectangular shape,
each of the monocells has a positive electrode tab extending from the positive electrode and a negative electrode tab extending from the negative electrode, each of the electrode tabs protruding in opposite directions, and
the expansion part of the separator of the one of the monocells extends in a direction perpendicular to the direction in which the positive electrode tab or the negative electrode tab protrudes.

4. The electrode assembly of claim 1 , wherein, in each monocell, the positive electrode and the first separator are bonded to each other, and the second separator and the negative electrode are bonded to each other.

5. The electrode assembly of claim 1 , wherein the one of the monocells is disposed at the uppermost layer of the electrode assembly, and the positive electrode of the one of the monocells is laminated on the one of the separators from which the expansion part extends, and
wherein an end of the expansion part covers the positive electrode of the one of the monocells, and the negative electrode of the one of the monocells is laminated on the expansion part.

6. The electrode assembly of claim 1 , wherein the one of the monocells is disposed at the uppermost layer of the electrode assembly, and the positive electrode of the one of the monocells is laminated on the one of the separators from which the expansion part extends, and
wherein the negative electrode of the one of the monocells is laminated on the one of the separators from which the expansion part extends.

7. The electrode assembly of claim 1 , wherein the one of the monocells is disposed at the uppermost layer of the electrode assembly, and the positive electrode of the one of the monocells is laminated on the one of the separators from which the expansion part extends, and
wherein the positive electrode of the one of the monocells is a single-sided positive electrode in which positive electrode active material is applied to only one surface of a positive electrode collector, and another surface of the positive electrode collector on which the positive electrode active material is not applied is disposed at the uppermost layer of the electrode assembly.

8. The electrode assembly of claim 1 , further comprising one or more flat plates disposed at one side or two opposite sides of the positive electrodes and the negative electrodes so that the one or more flat plates extend in a vertical direction perpendicular to a lateral direction in planar surfaces of the positive electrodes and the negative electrodes extend.

9. The electrode assembly of claim 8 , wherein each of the one or more flat plates is made of a non-conductive material.

10. The electrode assembly of claim 8 , wherein the expansion part wraps around the monocells by two turns, and each of the one or more flat plates is disposed between an inner layer of the expansion part and an outer layer of the expansion part, and each of the one or more flat plates is made of a metal material having thermal conductivity.

11. A secondary battery in which the electrode assembly of claim 1 is embedded in a pouch.

Assignees

• Lg Chemical Ltd
• Lg Energy Solution Ltd

Inventors

• Kim Yong Jun
• Jeong Hee Seok
• Sung Ki Won
• Lee Eun Ju

Classifications

• H01M50/461 Primary

  with adhesive layers between electrodes and separators · CPC title

• H01M10/0459

  Cells or batteries with folded separator between plate-like electrodes · CPC title

• H01M50/105

  Pouches or flexible bags · CPC title

• H01M10/0583

  of accumulators with folded construction elements except wound ones, i.e. folded positive or negative electrodes or separators, e.g. with "Z"-shaped electrodes or separators · CPC title

• H01M10/0413 Primary

  Large-sized flat cells or batteries for motive or stationary systems with plate-like electrodes · CPC title