Electrode assembly and polymer secondary battery cell including the same

Patent metadata

Field	Value
Publication number	US-11476546-B2
Application number	US-202017009272-A
Country	US
Kind code	B2
Filing date	Sep 1, 2020
Priority date	Feb 15, 2013
Publication date	Oct 18, 2022
Grant date	Oct 18, 2022

Abstract

An electrode assembly includes a cell stack part having (a) a structure in which one kind of radical unit is repeatedly disposed and has same number of electrodes and separators which are alternately disposed and integrally combined, or (b) a structure in which at least two kinds of radical units are disposed in a predetermined order, and an auxiliary unit disposed on at least one among an uppermost part or a lowermost part of the cell stack part. The one kind of radical unit of (a) has a four-layered structure in which a first electrode, a first separator, a second electrode and a second separator are sequentially stacked or a repeating structure in which the four-layered structure is repeatedly stacked, and each of the at least two kinds of radical units are stacked by ones in the predetermined order to form the four-layered structure or the repeating structure.

First claim

What is claimed is:

1. An electrode assembly, comprising:
a cell stack part having (a) a structure in which one kind of radical unit is repeatedly disposed such that each radical unit is disposed in direct contact with an adjacent radical unit, the one kind of radical unit having same number of electrodes and separators which are alternately disposed and integrally combined, or (b) a structure in which at least two kinds of radical units are disposed in a predetermined order such that each radical unit is disposed in direct contact with an adjacent radical unit according to the predetermined order, the at least two kinds of radical units each having same number of electrodes and separators which are alternately disposed and integrally combined,
a first auxiliary unit disposed on at least one among an uppermost part or a lowermost part of the cell stack part; and
wherein the one kind of radical unit of (a) has a four-layered structure in which a first electrode, a first separator, a second electrode and a second separator are sequentially stacked together or a repeating structure in which the four-layered structure is repeatedly stacked,
wherein each of the at least two kinds of radical units of (b) are stacked by ones in the predetermined order to form the four-layered structure or the repeating structure in which the four-layered structure is repeatedly stacked,
wherein adjacent radical units are all adhered with each other in the cell stack part with a first adhesion strength weaker than a second adhesion strength between the electrode and the separator in the radical unit,
wherein the separators include a coating layer that is adhesive, and attachment between the electrodes and the separators within each radical unit is provided by applying pressure to the electrodes and the separators with laminators to adhere the electrodes and the separators in the radical unit with the coating layer having the second adhesion strength, and
wherein the adjacent radical units do not include the separators having a coating layer that is adhesive therebetween.

2. A method of manufacturing an electrode assembly, the method comprising:
a first step of forming one kind of a radical unit having an alternately stacked structure of a same number of electrodes and separators, or at least two kinds of radical units having an alternately stacked structure of a same number of electrodes and separators;
a second step of forming a cell stack part by repeatedly stacking the one kind of the radical units such that each radical unit is disposed in direct contact with an adjacent radical unit, or by stacking the at least two kinds of the radical units in a predetermined order such that each radical unit is disposed in direct contact with an adjacent radical unit according to the predetermined order; and
a third step of stacking a first auxiliary unit on at least one among an uppermost part or a lowermost part of the cell stack part,
wherein the one kind of radical unit has a four-layered structure in which a first electrode, a first separator, a second electrode and a second separator are sequentially stacked together or a repeating structure in which the four-layered structure is repeatedly stacked,
wherein each of the at least two kinds of radical units are stacked by ones in the predetermined order to form the four-layered structure or the repeating structure in which the four-layered structure is repeatedly stacked,
wherein adjacent radical units are all adhered with each other in the cell stack part with a first adhesion strength weaker than a second adhesion strength between the electrode and the separator in the radical unit,
wherein the separators include a coating layer that is adhesive, and attachment between the electrodes and the separators within each radical unit is provided by applying pressure to the electrodes and the separators with laminators to adhere the electrodes and the separators in the radical unit with the coating layer having the second adhesion strength, and
wherein the adjacent radical units do not include the separators having a coating layer that is adhesive therebetween.

Assignees

• Lg Chemical Ltd
• Lg Energy Solution Ltd

Inventors

• Park Ji Won
• Ko Myung Hoon
• Na Seung Ho
• Ahn Chang Bum

Classifications

• Y02P70/50

  Manufacturing or production processes characterised by the final manufactured product · CPC title

• H01M10/0436 Primary

  Small-sized flat cells or batteries for portable equipment · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M10/0585 Primary

  of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators · CPC title

• H01M50/46

  Separators, membranes or diaphragms characterised by their combination with electrodes · CPC title