Rechargeable battery

Patent metadata

Field	Value
Publication number	US-10128470-B2
Application number	US-201514948155-A
Country	US
Kind code	B2
Filing date	Nov 20, 2015
Priority date	Mar 13, 2015
Publication date	Nov 13, 2018
Grant date	Nov 13, 2018

Abstract

A rechargeable battery includes: an electrode assembly formed by repeatedly stacking first and second electrodes while interposing a separator therebetween, the first and second electrodes each having an uncoated region and a coated region; and a case having a flexible property and accommodating the electrode assembly. The electrode assembly includes a fixing portion where the separator is attached and fixed to the uncoated regions of the first and second electrodes.

First claim

What is claimed is:

1. A rechargeable battery comprising:
an electrode assembly comprising first and second electrodes stacked on each other in a first direction with a separator interposed therebetween, the first and second electrodes each having an uncoated region and a coated region, the uncoated regions of the first and second electrodes being offset from each other along the first direction, the separator comprising:
a first portion overlapping the coated regions of the first and second electrodes;
a second portion overlapping the uncoated region of the first electrode and having a cutout portion exposing a corner portion of the uncoated region of the first electrode, the second portion being attached and fixed to the uncoated region of the first electrode; and
a third portion overlapping the uncoated region of the second electrode and having a cutout portion exposing a corner portion of the uncoated region of the second electrode, the third portion being attached and fixed to the uncoated region of the second electrode; and

a case having a flexible property and accommodating the electrode assembly.

2. The rechargeable battery of claim 1 , wherein the corner portions exposed by the cutout portion of the second portion and the cutout portion of the third portion neighbor each other.

3. The rechargeable battery of claim 1 , wherein the uncoated region of the first electrode and the second portion are adhered and fixed by an adhesive, and the uncoated region of the second electrode and the third portion are adhered and fixed by an adhesive.

4. The rechargeable battery of claim 1 , further comprising:
a first electrode tab electrically coupled to the first electrode at the corner portion of the first electrode exposed by the cutout portion of the first portion; and
a second electrode tab electrically coupled to the second electrode at the corner portion of the second electrode exposed by the cutout portion of the second portion.

5. The rechargeable battery of claim 4 , wherein the first and second electrode tabs are drawn out from one end portion of the case and are disposed to be separated by a distance.

6. The rechargeable battery of claim 4 , further comprising a margin portion disposed between one end of the electrode assembly and an inner surface of the case to allow a length of the electrode assembly to vary at a free end thereof.

7. The rechargeable battery of claim 6 , wherein the margin portion is disposed opposite to the first and second electrode tabs.

8. The rechargeable battery of claim 1 , wherein the case further comprises a first exterior member and a second exterior member that are disposed on opposite surfaces of the electrode assembly.

9. The rechargeable battery of claim 1 , wherein each of the first and second electrodes is made of a polymer sheet.

10. A rechargeable battery comprising:
an electrode assembly comprising a first electrode, a second electrode, and a separator between the first and second electrodes in a stacking direction, each of the first and second electrodes having an uncoated region and a coated region, the separator comprising:
a first portion overlapping the coated regions of the first and second electrodes;
a second portion overlapping the uncoated region of the first electrode and offset from the uncoated region of the second electrode along the stacking direction, the second portion having a cutout portion exposing a corner portion of the uncoated region of the first electrode, the second portion being attached and fixed to the uncoated region of the first electrode; and
a third portion overlapping the uncoated region of the second electrode and offset from the uncoated region of the first electrode along the stacking direction, the third portion having a cutout portion exposing a corner portion of the uncoated region of the second electrode, the third portion being attached and fixed to the uncoated region of the second electrode; and

a pouch accommodating the electrode assembly.

11. The rechargeable battery of claim 10 , wherein the corner portions exposed by the cutout portion of the second portion and the cutout portion of the third portion are adjacent to each other.

12. The rechargeable battery of claim 10 , wherein the uncoated region of the first electrode and the second portion are adhered and fixed by an adhesive, and the uncoated region of the second electrode and the third portion are adhered and fixed by an adhesive.

13. The rechargeable battery of claim 10 , further comprising:
a first electrode tab electrically coupled to the first electrode at the corner portion of the first electrode exposed by the cutout portion of the first portion; and
a second electrode tab electrically coupled to the second electrode at the corner portion of the second electrode exposed by the cutout portion of the second portion.

14. The rechargeable battery of claim 13 , further comprising a margin portion disposed between one end of the electrode assembly and an inner surface of the pouch to allow a length of the electrode assembly to vary at a free end thereof.

15. The rechargeable battery of claim 14 , wherein the margin portion is disposed opposite to the first and second electrode tabs.

16. The rechargeable battery of claim 10 , wherein the pouch further comprises a first exterior member and a second exterior member that are disposed on opposite surfaces of the electrode assembly.

17. The rechargeable battery of claim 10 , wherein each of the first and second electrodes is made of a polymer sheet.

18. A method of forming a rechargeable battery, the method comprising:
providing an electrode assembly by repeatedly stacking first and second electrodes while interposing a separator therebetween, each of the first and second electrodes having an uncoated region and a coated region, the separator comprising a first portion overlapping the coated regions of the first and second electrodes, a second portion overlapping the uncoated region of the first electrode and offset from the uncoated region of the second electrode along a stacking direction, the second portion having a cutout portion exposing a corner portion of the uncoated region of the first electrode, and a third portion overlapping the uncoated region of the second electrode and offset from the uncoated region of the first electrode along the stacking direction, the third portion having a cutout portion exposing a corner portion of the uncoated region of the second electrode, the second and third portions being attached and fixed to the uncoated region of the first and second electrodes, respectively; and
accommodating the electrode assembly in a pouch.

Assignees

• Samsung Sdi Co Ltd

Inventors

• Sohn Ju-Hee
• Suh Jun-Won
• Yi Jeong-Doo
• Han Ju-Hyeong
• Song Hyun-Hwa
• Hong Seok-Hun

Classifications

• H01M4/70 Primary

  characterised by shape or form · CPC title

• H01M10/0585

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

• H01M10/0436

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

• H01M10/0413 Primary

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

• H01M2220/30

  Batteries in portable systems, e.g. mobile phone, laptop · CPC title