Pouch-Type Secondary Battery Having Gas Discharge Means

Patent metadata

Field	Value
Publication number	US-2020321577-A1
Application number	US-201916753442-A
Country	US
Kind code	A1
Filing date	Jan 24, 2019
Priority date	Apr 23, 2018
Publication date	Oct 8, 2020
Grant date	—

Abstract

Disclosed is a pouch-type secondary battery. More particularly, disclosed is a pouch-type secondary battery having a gas discharge means, the pouch-type secondary battery including an electrode assembly including a positive electrode, a negative electrode, and a separator interposed between the positive electrode and the negative electrode, a pouch-type case configured to wrap around the electrode assembly, a pair of insulative films disposed in a predetermined region of the edge of the pouch-type case so as to face each other, a positive electrode lead, one side of which is electrically connected to a positive electrode current collector of the electrode assembly and the other side of which protrudes out of the pouch-type case through between the insulative films, a negative electrode lead, one side of which is electrically connected to a negative electrode current collector of the electrode assembly and the other side of which protrudes out of the pouch-type case through between the insulative films, and a gas discharge member interposed between the insulative films, the gas discharge member being configured to discharge gas generated in the pouch-type case to the outside, whereby the swelling phenomenon and explosion of the battery are prevented.

First claim

1 . A pouch-type secondary battery comprising:
an electrode assembly comprising a positive electrode, a negative electrode, and a separator interposed between the positive electrode and the negative electrode; a pouch-type case configured to wrap around the electrode assembly; a first pair of insulative films disposed in a predetermined region of an edge of the pouch-type case so as to face each other; a positive electrode lead, one side of which is electrically connected to a positive electrode current collector of the electrode assembly and another side of which protrudes out of the pouch-type case between the first pair of insulative films; a second pair of insulative films disposed in a predetermined region of the edge of the pouch-type case so as to face each other; a negative electrode lead, one side of which is electrically connected to a negative electrode current collector of the electrode assembly and another side of which protrudes out of the pouch-type case between the second pair of insulative films; and a gas discharge member interposed between the first pair of insulative films or the second pair of insulative films, the gas discharge member being configured to discharge gas generated in the pouch-type case to an outside.

2 . The pouch-type secondary battery according to claim 1 , wherein the gas discharge member comprises a body part, the body part being provided with a gas movement passageway, an interior of which is empty, the gas movement passageway being configured to discharge the gas generated in the pouch-type case to the outside, a spring located in the gas movement passageway, and a ball abutting the spring and configured to open and close the gas movement passageway.

3 . The pouch-type secondary battery according to claim 2 , wherein the body part is further provided with a concave and convex portion, which is formed at an outer surface thereof.

4 . The pouch-type secondary battery according to claim 3 , wherein the concave and convex portion comprises at least one groove channel formed in a longitudinal direction of the body part.

5 . The pouch-type secondary battery according to claim 4 , wherein one side of the at least one groove channel located in an inward direction of the pouch-type case does not overlap the pair of insulative films between which the gas discharge member is interposed such that the gas generated in the pouch-type case is introduced into the at least one groove channel.

6 . The pouch-type secondary battery according to claim 3 , wherein the concave and convex portion is provided only at a portion of the outer surface of the body part.

7 . The pouch-type secondary battery according to claim 6 , wherein the concave and convex portion is provided in a longitudinal direction of the body part, and wherein a non-concave and non-convex portion is provided at a predetermined position of the body part that is directed to an outside of the pouch-type case.

8 . The pouch-type secondary battery according to claim 7 , wherein the concave and convex portion comprises at least one groove channel formed in the longitudinal direction of the body part, wherein one side of the at least one groove channel, located in an inward direction of the pouch-type case, does not overlap the pair of insulative films between which the gas discharge member is interposed, and the other side of the at least one groove channel, at which the non-concave and non-convex portion is provided, overlaps the pair of insulative films between which the gas discharge member is interposed such that the gas generated in the pouch-type case is introduced into the at least one groove channel.

9 . The pouch-type secondary battery according to claim 4 , wherein a portion of the at least one groove channel that is located in an inward direction of the pouch-type case communicates with an interior of the pouch-type case such that the gas generated in the pouch-type case is introduced into the at least one groove channel.

10 . The pouch-type secondary battery according to claim 9 , wherein a non-concave and non-convex portion is provided at a predetermined position of the body part that is directed to an outside of the pouch-type case, the non-concave and non-convex portion being located so as to overlap the pair of insulative films between which the gas discharge member is interposed.

11 . The pouch-type secondary battery according to claim 2 , wherein the body part has any one of a circular section, an oval section, and a quadrangular section.

12 . The pouch-type secondary battery according to claim 2 , wherein the gas discharge member is made of metal or plastic.

13 . A battery module comprising the pouch-type secondary battery according to claim 1 .

14 . A battery pack comprising the battery module according to claim 13 .

15 . The pouch-type secondary battery according to claim 2 , wherein one of the positive electrode lead and the negative electrode lead has a left surface, a right surface, and an upper surface that surround the gas discharge member.

Assignees

• Lg Chemical Ltd

Inventors

• Kim Sang Hun
• Kim Myung Hwan
• Choi Yong Su
• Kim Na Yoon
• Yu Hyung Kyun

Classifications

• H01M50/595

  Tapes · CPC title

• H01M50/129

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

• H01M50/588

  outside the batteries, e.g. incorrect connections of terminals or busbars · CPC title

• H01M50/178

  for pouch or flexible bag cells · CPC title

• H01M50/105

  Pouches or flexible bags · CPC title