Electrode assembly including bi-cell and full-cell and secondary battery including the same

Patent metadata

Field	Value
Publication number	US-2017207481-A1
Application number	US-201515505512-A
Country	US
Kind code	A1
Filing date	Oct 22, 2015
Priority date	Oct 31, 2014
Publication date	Jul 20, 2017
Grant date	—

Abstract

Disclosed herein is a stacked/folded type electrode assembly configured to have a structure in which a plurality of unit cells, each of which includes a positive electrode having an electrode mixture including an electrode active material applied to a current collector, a negative electrode having an electrode mixture including an electrode active material applied to a current collector, and a separator disposed between the positive electrode and the negative electrode, is wound in the state of being arranged on a sheet type separation film, wherein the unit cells include one full cell and three or more bi-cells, the outermost unit cells of the electrode assembly are each configured such that an electrode forming the outside of the electrode assembly is configured as a single-sided electrode, in which no electrode mixture is applied to the surface of the current collector facing the outside of the electrode assembly, and the single-sided electrodes are electrodes having the same polarity.

First claim

1 . A stacked/folded type electrode assembly configured to have a structure in which a plurality of unit cells, each of which comprises a positive electrode having an electrode mixture comprising an electrode active material applied to a current collector, a negative electrode having an electrode mixture comprising an electrode active material applied to a current collector, and a separator disposed between the positive electrode and the negative electrode, is wound in a state of being arranged on a sheet type separation film, wherein
the unit cells comprise one full cell and three or more bi-cells, outermost unit cells of the electrode assembly are each configured such that an electrode forming an outside of the electrode assembly is configured as a single -sided electrode, in which no electrode mixture is applied to a surface of the current collector facing the outside of the electrode assembly, and the single-sided electrodes are electrodes having the same polarity.

2 . The electrode assembly according to claim 1 , wherein the unit cells are wound in a state in which the unit cells are sequentially arranged in a plane from a first unit cell, which is located at a winding start point of the separation film, to a 2n-th unit cell (where n is an integer that satisfies 2≦n≦20), which is located at a winding end point of the separation film.

3 . The electrode assembly according to claim 1 , wherein the full cell is a first full cell, which is configured to have a structure in which a first positive electrode, configured as a single-sided positive electrode, a separator, and a negative electrode are sequentially stacked, or a second full cell, which is configured to have a structure in which a first negative electrode, configured as a single-sided negative electrode, a separator, and a positive electrode are sequentially stacked, the first positive electrode or the first negative electrode facing the separation film.

4 . The electrode assembly according to claim 1 , wherein each of the bi-cells is an A-type bi-cell, which is configured to have a structure in which a positive electrode, a negative electrode, and another positive electrode are sequentially stacked in a state in which separators are disposed therebetween, or a C-type bi-cell, which is configured to have a structure in which a negative electrode, a positive electrode, and another negative electrode are sequentially stacked in a state in which separators are disposed therebetween.

5 . The electrode assembly according to claim 4 , wherein the A-type bi-cell comprises a 1A-type bi-cell, which is configured to have a structure in which a first positive electrode, configured as a single-sided positive electrode, a negative electrode, and a positive electrode are sequentially stacked in a state in which separators are disposed therebetween, or a 2A-type bi-cell, which is configured to have a structure in which a positive electrode, a negative electrode, and another positive electrode are sequentially stacked in a state in which separators are disposed therebetween.

6 . The electrode assembly according to claim 4 , wherein the C-type bi-cell comprises a 1C-type bi-cell, which is configured to have a structure in which a first negative electrode, configured as a single-sided negative electrode, a positive electrode, and a negative electrode are sequentially stacked in a state in which separators are disposed therebetween, or a 2C-type bi-cell, which is configured to have a structure in which a negative electrode, a positive electrode, and another negative electrode are sequentially stacked in a state in which separators are disposed therebetween.

7 . The electrode assembly according to claim 2 , wherein the first unit cell is a bi-cell, the 2n-th unit cell is a 1A-type bi-cell, and a (2n-1)-th unit cell is a first full cell.

8 . The electrode assembly according to claim 2 , wherein the first unit cell is a bi-cell, the 2n-th unit cell is a 1C-type bi-cell, and a (2n-1)-th unit cell is a second full cell.

9 . The electrode assembly according to claim 2 , wherein the first unit cell is a bi-cell, the 2n-th unit cell is a first full cell, and a (2n-1)-th unit cell is a 1A-type bi-cell.

10 . The electrode assembly according to claim 2 , wherein the first unit cell is a bi-cell, the 2n-th unit cell is a second full cell, and a (2n-1)-th unit cell is a 1C-type bi-cell.

11 . The electrode assembly according to claim 1 , wherein the single-sided electrode is a first positive electrode.

12 . The electrode assembly according to claim 1 , wherein the single-sided electrode is a first negative electrode.

13 . A secondary battery comprising an electrode assembly according to claim 1 mounted in a battery case.

14 . The secondary battery according to claim 13 , wherein the battery case is a pouch-shaped case made of an aluminum laminate sheet or a can-shaped case.

15 . A battery pack comprising a secondary battery according to claim 14 as a unit cell.

16 . A device comprising a battery pack according to claim 15 as a power source.

17 . The device according to claim 16 , wherein the device is a mobile electronic device, a power tool driven by a battery-powered motor, an electric automobile, such as such as an electric vehicle (EV), a hybrid electric vehicle (HEV), or a plug-in hybrid electric vehicle (PHEV), an electric two-wheeled vehicle, such as an electric bicycle (E-bike) or an electric scooter (E-scooter), an electric golf cart, or a power storage system.

Assignees

• Lg Chemical Ltd

Inventors

• Choi Hyoungsik
• Ryu Sang Baek
• Park Chan Ki

Classifications

• H01M50/107

  having curved cross-section, e.g. round or elliptic (H01M50/103, H01M50/109, H01M50/11 take precedence) · CPC title

• H01M50/103

  prismatic or rectangular (H01M50/109, H01M50/11 take precedence) · CPC title

• H01M10/0459 Primary

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

• H01M10/0418

  with bipolar electrodes · 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