Secondary battery

Patent metadata

Field	Value
Publication number	US-2018277902-A1
Application number	US-201815994190-A
Country	US
Kind code	A1
Filing date	May 31, 2018
Priority date	Jan 6, 2016
Publication date	Sep 27, 2018
Grant date	—

Abstract

The present invention provides a secondary battery, comprising a winding bare electrode assembly, a battery pouch and a sealing strip. The winding bare electrode assembly comprises an separator and a tab. The sealing strip encloses a part of the tab of the winding bare electrode assembly, is used for hermetically extending the tab of the winding bare electrode assembly out from the battery pouch of the secondary battery, and is provided with a package portion located in a package area of the battery pouch of the secondary battery, and an extension portion disposed in the battery pouch. Wherein a first width of the package portion in the width direction is greater than a second width of the tab, a third width of the extension portion in the width direction is not less than the second width of the tab, and is less than the first width of the package portion, the outer side edge of the extension portion in the width direction is separated from the separator in the width direction, and the lower side edge of the package portion in the length direction is separated from the upper side edge of the separator in the length direction.

First claim

What is claimed is:

1 . A secondary battery, comprising:
an electrode assembly, comprising a separator and a tab; a battery pouch, packing the electrode assembly; and a sealing strip, disposed on a surface of the tab and comprising:
a package portion, disposed on a package area of the battery pouch; and
an extension portion, disposed in the battery pouch;
wherein, in a width direction, a first width of the package portion is greater than a second width of the tab; in the width direction, a third width of the extension portion is greater or equal to less than the second width of the tab; in the width direction, a third width of the extension portion is less than the first width of the package portion; the sealing strip is not connected with the separator.

2 . The secondary battery according to claim 1 , wherein, in the width direction, a distance between an outer side edge of the extension portion and an outer side edge of the tab is D 1 , 0 mm≤D 1 ≤10 mm.

3 . The secondary battery according to claim 1 , wherein, in the width direction, a distance between an inner side edge of the extension portion and an inner side edge of the tab is D 2 , 0 mm≤D 2 ≤10 mm.

4 . The secondary battery according to claim 1 , wherein, in L direction, a length of the extension portion is L 1 , 0.2 mm≤L 1 <10 mm.

5 . The secondary battery according to claim 1 , wherein a rounded corner is disposed between an outer side edge of the extension portion and a lower side edge of the package portion.

6 . The secondary battery according to claim 4 , wherein a radius of the rounded corner is 0 mm-10 mm.

7 . The secondary battery according to claim 1 , along L direction, a lower side edge of the extension portion is connected with an electrode plate of the electrode assembly.

8 . The secondary battery according to claim 1 , wherein the sealing strip and an axis of the tab are symmetrical.

9 . The secondary battery according to claim 1 , wherein the battery pouch is a soft battery pouch.

10 . The secondary battery according to claim 1 , wherein the secondary battery is a lithium ion battery, a sodium ion battery or a zinc ion battery.

Assignees

• Ningde Amperex Technology Ltd

Inventors

• Jin Xin
• Tao Tao
• Xi Jie

Classifications

• H01M50/178

  for pouch or flexible bag cells · CPC title

• H01M50/186

  characterised by the disposition of the sealing members · CPC title

• H01M50/124

  having a layered structure · CPC title

• H01M50/55

  on the same side of the cell · CPC title

• H01M2/08

  Electricity · mapped topic