Electrode assembly and secondary battery including the same

Patent metadata

Field	Value
Publication number	US-10686165-B2
Application number	US-201514734816-A
Country	US
Kind code	B2
Filing date	Jun 9, 2015
Priority date	Sep 17, 2014
Publication date	Jun 16, 2020
Grant date	Jun 16, 2020

Abstract

An electrode assembly and a secondary battery including the same, the electrode assembly including a plurality of first polar plates, each first polar plate including a first coating portion coated with a first active material, and a bent first non-coated portion; a plurality of second polar plates, each second polar plate including a second coating portion coated as a second active material, and a bent second non-coated portion; and a plurality of separators between the first polar plates and the second polar plates.

First claim

What is claimed is:

1. An electrode assembly comprising a plurality of first polar plates having a first polarity, each first polar plate including: a first coating portion coated with a first active material, and a bent first non-coated portion including a first extending portion, a first bending portion and a second extending portion continuous with each other and a third extending portion, a second bending portion, and a fourth extending portion continuous with each other; the second extending portion of each first polar plate straightly extends from the first bending portion of each first polar plate toward and to be closer to the second coating portion of each second polar plate adjacent to each first polar plate, and the fourth extending portion of each second polar plate straightly extends from the second bending portion of each second polar plate toward and to be closer to the first coating portion of each first polar plate adjacent to each second polar plate and the second extending portion extends from the first bending portion toward the second coating portion at an acute angle with respect to the first extending portion to overlap the first extending portion and the fourth extending portion extends from the second bending portion toward the first coating portion at an acute angle with respect to the third extending portion to overlap the third extending portion, an end portion of the first non-coated portion is extended to the opposite side of the first polar plate and directly connected to a first lead tab, and an end portion of the second non-coated portion is extended to the opposite side of the second polar plate and directly connected to a second lead tab.

2. The electrode assembly as claimed in claim 1 , wherein:
the plurality of first polar plates includes a plurality of first non-coated portions,
the plurality of second polar plates includes a plurality of second non-coated portions, and
the plurality of first non-coated portions and the plurality of second non-coated portions are each bent in a Z shape.

3. The electrode assembly as claimed in claim 2 , wherein the first polar plates that include the first coating portion and the second polar plates that include the second coating portion are alternately stacked in a stack portion of the electrode assembly.

4. The electrode assembly as claimed in claim 1 , wherein:
the plurality of first polar plates includes a plurality of first non-coated portions,
the plurality of second polar plates includes a plurality of second non-coated portions, and
the plurality of first non-coated portions and the plurality of second non-coated portions are each bent in a shape in which the first non-coated portions or the second non-coated portions are repeatedly folded back on one another in alternating directions.

5. The electrode assembly as claimed in claim 1 , wherein:
the plurality of first polar plates includes a plurality of first non-coated portions,
the plurality of second polar plates includes a plurality of second non-coated portions, and
the plurality of first non-coated portions and the plurality of second non-coated portions are each bent to have a corrugated shape.

6. The electrode assembly as claimed in claim 1 , wherein:
the first polar plates are stacked in a first direction with a first interval therebetween,
the second polar plates are stacked in the first direction with a second interval therebetween, and
the first interval is equal to the second interval.

7. The electrode assembly as claimed in claim 6 , wherein a width of the bent first non-coated portion in the first direction is equal to or smaller than the first interval.

8. The electrode assembly as claimed in claim 1 , wherein:
the plurality of first polar plates includes a plurality of first non-coated portions stacked at one side of a first end of the electrode assembly, and
the plurality of second polar plates includes a plurality of second non-coated portions stacked at another side of the first end of the electrode assembly.

9. A secondary battery comprising an electrode assembly and a case accommodating the electrode assembly, the electrode assembly including: a plurality of first polar plates having a first polarity, each first polar plate including: a first coating portion coated with a first active material, and a bent first non-coated portion including a first extending portion, a first bending portion and a second extending portion continuous with each other and a third extending portion, a second bending portion, and a fourth extending portion continuous with each other; the second extending portion of each first polar plate straightly extends from the first bending portion of each first polar plate toward and to be closer to the second coating portion of each second polar plate adjacent to each first polar plate, and the fourth extending portion of each second polar plate straightly extends from the second bending portion of each second polar plate toward and to be closer to the first coating portion of each first polar plate adjacent to each second polar plate and the second extending portion extends from the first bending portion toward the second coating portion at an acute angle with respect to the first extending portion to overlap the first extending portion and the fourth extending portion extends from the second bending portion toward the first coating portion at an acute angle with respect to the third extending portion to overlap the third extending portion, an end portion of the first non-coated portion is extended to the opposite side of the first polar plate and directly connected to a first lead tab, and an end portion of the second non-coated portion is extended to the opposite side of the second polar plate and directly connected to a second lead tab.

10. The secondary battery as claimed in claim 9 , wherein:
the plurality of first polar plates includes a plurality of first non-coated portions,
the plurality of second polar plates includes a plurality of second non-coated portions, and
the plurality of first non-coated portions and the plurality of second non-coated portions are each bent in a Z shape.

11. The secondary battery as claimed in claim 9 , wherein the first polar plates that include the first coating portion and the second polar plates that include the second coating portion are alternately stacked in a stack portion of the electrode assembly.

12. The secondary battery as claimed in claim 9 , wherein:
the plurality of first polar plates includes a plurality of first non-coated portions,
the plurality of second polar plates includes a plurality of second non-coated portions, and
the plurality of first non-coated portions and the plurality of second non-coated portions are each bent in a shape in which the first non-coated portions or the second non-coated portions are repeatedly folded back on one another in alternating directions.

13. The secondary battery as claimed in claim 9 , wherein:
the plurality of first polar plates includes a plurality of first non-coated portions,
the plurality of second polar plates includes a plurality of second non-coated portions, and
the plurality of first non-coated portions and the plurality of second non-coated portions are each bent to have a corrugated shape.

14. The secondary battery as claimed in claim 9 , wherein:
the first polar plates are stacked in a first direction with a first interval therebetween,
the second polar plates are stacked in the first direction with a second interval therebetween, and
the first interval is equal to the second interval.

15. The secondary battery as

Assignees

• Samsung Sdi Co Ltd

Inventors

• Song Hyunhwa
• Suh Junwon
• Yi Jeong-Doo
• Sohn Juhee

Classifications

• H01M10/0436 Primary

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

• H01M50/586

  inside the batteries, e.g. incorrect connections of electrodes · CPC title

• H01M50/557

  Plate-shaped terminals · CPC title

• H01M50/463

  Separators, membranes or diaphragms characterised by their shape · CPC title

• H01M50/572

  Means for preventing undesired use or discharge · CPC title