Flexible secondary battery

Patent metadata

Field	Value
Publication number	US-2017117553-A1
Application number	US-201615299638-A
Country	US
Kind code	A1
Filing date	Oct 21, 2016
Priority date	Oct 21, 2015
Publication date	Apr 27, 2017
Grant date	—

Abstract

A flexible secondary battery includes an exterior member having an accommodation space inside, a cathode collector and an anode collector located in the accommodation space and spaced apart from each other, a cathode active material portion on the cathode collector, and an anode active material portion on the anode collector. The cathode collector includes a first connection portion extending in a first direction and a plurality of first leg portions protruding from the first connection portion in a second direction different from the first direction. The anode collector includes a second connection portion parallel to the first connection portion and a plurality of second leg portions protruding from the second connection portion toward the first connection portion. The first leg portions and the second leg portions are alternately arranged between the first connection portion and the second connection portion. The cathode active material portion is located only on the first leg portions. The anode active material portion is located on the second connection portion and the second leg portions.

First claim

What is claimed is:

1 . A flexible secondary battery comprising:
an exterior member having an accommodation space inside; a cathode collector and an anode collector located in the accommodation space and spaced apart from each other; a cathode active material portion on the cathode collector; and an anode active material portion on the anode collector, wherein the cathode collector comprises:
a first connection portion extending in a first direction; and
a plurality of first leg portions protruding from the first connection portion in a second direction different from the first direction,
wherein the anode collector comprises:
a second connection portion parallel to the first connection portion; and
a plurality of second leg portions protruding from the second connection portion toward the first connection portion,
wherein the plurality of first leg portions and the plurality of second leg portions are alternately arranged between the first connection portion and the second connection portion, wherein the cathode active material portion is located only on the plurality of first leg portions, and wherein the anode active material portion is located on the second connection portion and the plurality of second leg portions.

2 . The flexible secondary battery of claim 1 , wherein one end of the cathode active material portion close to the first connection portion is located on a same line as one end of each of the plurality of second leg portions close to the first connection portion, or closer to the second connection portion than one end of each of the plurality of second leg portions.

3 . The flexible secondary battery of claim 2 , wherein a shortest distance between the one end of the cathode active material portion and the same line is equal to or less than about 50% of a shortest distance between the one end of each of the plurality of second leg portions and the first connection portion.

4 . The flexible secondary battery of claim 1 , wherein one end of the cathode active material portion close to the first connection portion is located closer to the first connection portion than the one end of each of the plurality of second leg portions close to the first connection portion, and
a shortest distance between the one end of the cathode active material portion and the first connection portion is greater than about 50% of a shortest distance between the one end of each of the plurality of second leg portions and the first connection portion.

5 . The flexible secondary battery of claim 1 , wherein the cathode collector and the anode collector are arranged on a same plane.

6 . The flexible secondary battery of claim 1 , wherein an area of the plurality of first leg portions is larger than an area of the cathode active material portion.

7 . The flexible secondary battery of claim 1 , wherein the plurality of first leg portions and the plurality of second leg portions are parallel to each other, and
a gap between the plurality of first leg portions and the plurality of second leg portions is greater than about 0.5 mm and equal to or less than about 1 mm.

8 . The flexible secondary battery of claim 7 , wherein a width of each of the plurality of first leg portions and a width of each of the plurality of second leg portions range from about 1 mm to about 3 mm.

9 . The flexible secondary battery of claim 8 , wherein the width of each of the plurality of first leg portions and the width of each of the plurality of second leg portions are same.

10 . The flexible secondary battery of claim 8 , wherein a ratio of a length and a width of each of the plurality of first leg portions and each of the plurality of second leg portions ranges from about 10:1 to about 200:1.

11 . The flexible secondary battery of claim 1 , wherein a cathode tab and an anode tab are respectively connected to the cathode collector and the anode collector, and the cathode tab and the anode tab are exposed to outside of the exterior member.

12 . The flexible secondary battery of claim 11 , wherein the exterior member comprises a first exterior member and a second exterior member,
the first exterior member and the second exterior member are bonded to each other at edges of the first exterior member and the second exterior member, and an insulating film is attached to outer surfaces of the cathode tab and the anode tab, contacting the first exterior member and the second exterior member.

13 . The flexible secondary battery of claim 1 , wherein one end of each of the plurality of second leg portions has a round shape.

14 . The flexible secondary battery of claim 1 , wherein a width of each of the plurality of first leg portions gradually increases from the second connection portion toward the first connection portion and a width of each of the plurality of second leg portions gradually increases from the first connection portion toward the second connection portion.

15 . The flexible secondary battery of claim 1 , wherein the first direction and the second direction are perpendicular to each other.

Assignees

• Korea Inst Sci & Tech

Inventors

• Choi Insuk
• Kim Kee Bum
• Oh Kyu Hwan

Classifications

• H01M50/136

  Flexibility or foldability · CPC title

• H01M50/129

  with two or more layers of only organic material · CPC title

• H01M50/178

  for pouch or flexible bag cells · CPC title

• H01M50/121

  Organic material · CPC title

• H01M50/119

  Metals · CPC title