Electrode assembly having bending portions and secondary battery including the same

Patent metadata

Field	Value
Publication number	US-10014551-B2
Application number	US-201113113455-A
Country	US
Kind code	B2
Filing date	May 23, 2011
Priority date	Sep 2, 2010
Publication date	Jul 3, 2018
Grant date	Jul 3, 2018

Abstract

A secondary battery having positive and negative electrode plates inserted into the interior of a pouch, and positive and negative electrode active material layers respectively coated on the positive and negative electrode plates are arranged at a constant interval. Bending portions are provided to bend positive and negative electrode non-coating portions respectively not coated with the positive and negative electrode active material layers.

First claim

What is claimed is:

1. An electrode assembly, comprising:
a plurality of positive electrode plates each having positive electrode active material layers formed by intermittently coating a positive electrode active material on a positive electrode collector and positive electrode non-coated portions respectively formed between the positive electrode active material layers, said positive electrode active material of the plurality of positive plates having no direct physical contact with any portion of an adjacent positive electrode active material of the plurality of positive plates;
a plurality of negative electrode plates each having negative electrode active material layers formed by intermittently coating a negative electrode active material on a negative electrode collector and negative electrode non-coated portions respectively formed between the negative electrode active material layers, said negative electrode active material of the plurality of negative plates having no direct physical contact with any portion of an adjacent negative electrode active material of the plurality of negative plates;
tab portions respectively formed to extend from the positive and negative electrode plates;
separators interposed between the positive and negative electrode plates, said positive electrode non-coated portions and said negative electrode non-coated portions forming bending portions located between each and every one of the negative and positive electrode active material layers, said bending portions traversing the longitudinal axis of electrode assembly in each and every one of the positive and negative electrode non-coated portions that enable the electrode assembly to be bent;
concave groove portions comprised of cut-outs along respective longitudinal edges of the negative and positive non-coated portions of the corresponding negative and positive electrode collector that enable the electrode assembly to be bent, located on each end of the bending portions; and
a pouch comprising a bending display portion for each and every one of said bending portions, said pouch being in direct contact with the negative and positive electrode active material layers of each of the negative and positive electrode plates of the electrode assembly and conforming to the shape of the electrode assembly, said pouch bending at each and every bending display portion in a zigzag manner as the electrode assembly bends at each and every one of said bending portions.

2. The electrode assembly according to claim 1 , wherein the bending portions include bending lines formed at the plurality of the positive and negative electrode non-coated portions.

3. The electrode assembly according to claim 2 , wherein the bending lines comprise holes formed and spaced apart from one another at a constant interval.

4. The electrode assembly according to claim 1 , wherein the shape of the concave groove portions is any one of a circular shape, an elliptic shape, a wedge shape and a polygonal shape.

5. The electrode assembly according to claim 2 , wherein auxiliary concave groove portions are further formed at sides of positions of the separator, corresponding to the positions at which the bending portions are formed, respectively.

6. The electrode assembly according to claim 5 , wherein the shape of the auxiliary concave groove portions is any one of a circular shape, an elliptic shape, a wedge shape and a polygonal shape.

7. The electrode assembly according to claim 1 , wherein the positive and negative electrode plates are formed in a zigzag pattern while the positive and negative electrode non-coated portions are bent by the bending portions.

8. A secondary battery, comprising:
an electrode assembly comprising a plurality of positive electrode plates each having positive electrode active material layers formed by intermittently coating a positive electrode active material on a positive electrode collector and positive electrode non-coated portions respectively formed between the positive electrode active material layers, said positive electrode active material of the plurality of positive plates having no direct physical contact with any portion of an adjacent positive electrode active material of the plurality of positive plates;
a plurality of negative electrode plates each having negative electrode active material layers formed by intermittently coating a negative electrode active material on a negative electrode collector and negative electrode non-coated portions respectively formed between the negative electrode active material layers, said negative electrode active material of the plurality of negative plates having no direct physical contact with any portion of an adjacent negative electrode active material of the plurality of negative plates;
tab portions respectively formed to extend from the positive and negative electrode plates;
a plurality of separators interposed between the positive and negative electrode plates; and
a pouch accommodating the electrode assembly, said pouch including a plurality of electrode-plate damage prevention plates formed of rigid material corresponding in size, shape and location to each of the plurality of positive and negative electrode plates and being directly attached to inner or outer surfaces of the pouch, bending display portions formed in a linear shape in the pouch between each and every one of the plurality of electrode-plate damage prevention plates, said electrode-plate damage prevention plates being in direct physical contact with the pouch and in direct physical contact with the positive and negative electrode active materials of each and every one of the negative and positive electrode plates of the electrode assembly,
each of the positive and negative electrode non-coated portions of the electrode assembly having bending portions located between each and every one of the positive and negative electrode coated portions that enables the electrode assembly to be bent, and the positive and negative electrode plates folded/unfolded in a zigzag manner while the positive and negative electrode non-coated portions are bent by the bending portions, said bending portions traversing the longitudinal axis of electrode assembly,
concave groove portions comprised of cut-outs on the edges of the positive electrode collector and negative electrode collector at the negative and positive non-coated portions away from their centers, that enable the electrode assembly to be bent are located on opposite ends of each of the bending portions, and
the bending display portions being located at positions corresponding to each and every one of the bending portions formed on the positive and negative electrode non-coated portions of the electrode assembly, the bending display portions bending with each and every one of the bending portions as the positive and negative electrode plates are folded/unfolded in the zigzag manner, and said pouch bending in the zigzag manner with the electrode assembly.

9. The secondary battery according to claim 8 , wherein the electrode assembly is formed by stacking a plurality of electrode assemblies.

10. The secondary battery according to claim 8 , wherein the electrode-plate damage prevention plate is formed with a plastic or metal plate.

11. The secondary battery according to claim 8 , wherein the electrode-plate damage prevention plates are attached to the pouch with a double-faced adhesive tape.

12. The secondary battery according to claim 8 , wherein the electrode-plate damage prevention plates are formed on one or more of inner or outer surfaces of the pouch.

13. The secondary battery according to claim 8 , wherein the plurality of e

Assignees

• Ahn Chang Bum
• Samsung Sdi Co Ltd

Inventors

• Ahn Chang-Bum

Classifications

• H01M50/136

  Flexibility or foldability · CPC title

• H01M50/14

  for protecting against damage caused by external factors · CPC title

• H01M2/0275

  Electricity · mapped topic

• H01M10/045 Primary

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

• Y02E60/10

  Energy storage using batteries · CPC title