IP Library › Granted Patent US 12706347
Granted Patent B2
US 12706347 · App. 18/035,232 · Granted Aug 11, 2026

Secondary battery

Inventors: Hun-Hee Lim (Daejeon, KR); Sang-Hun Kim (Daejeon, KR); Min-Hyeong Kang (Daejeon, KR); Dae-Woong Song (Daejeon, KR); Hyung-Kyun Yu (Daejeon, KR); Soo-Ji Hwang (Daejeon, KR)
Assignee: LG Energy Solution, Ltd.
H01M50/375H01M50/105H01M50/3425
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Quick Facts
Patent No.
US 12706347
App. No.
18/035,232
Granted
Aug 11, 2026
Kind
B2
Abstract

Disclosed herein is a secondary battery having a vent member. The secondary battery may include an electrode assembly, a case for accommodating the electrode assembly and a vent member. The vent member is configured to protrude to the outside of the case, and one end of the vent member protruding to the outside of the case is joined to an outer side of the case.

Claims (46)

1 . A secondary battery, comprising:

an electrode assembly;

a case accommodating the electrode assembly therein; and

a vent member,

wherein the vent member protrudes to an outside of the case at a first location, and one end of the vent member protruding to the outside of the case is joined to an outer side of the case at a second location that is spaced apart from the first location,

wherein the case includes an accommodation portion for accommodating the electrode assembly and a sealing portion containing a sealant resin and is formed to seal the electrode assembly within the case, and

the one end of the vent member protruding to the outside of the case is joined to the outer side of the case corresponding to a region inside the accommodation portion where the electrode assembly is not located.

2 . The secondary battery according to claim 1 ,

wherein a part of the vent member protruding to the outside of the case is bent so that the one end of the vent member protruding to the outside of the case is joined to the outer side of the case.

3 . The secondary battery according to claim 1 ,

wherein the other end of the vent member is located in the sealing portion.

4 . The secondary battery according to claim 3 ,

wherein an electrode lead is attached to the electrode assembly, and

the other end of the vent member is located in the sealing portion at a side of the case where the electrode lead is exposed to the outside.

5 . The secondary battery according to claim 3 ,

wherein an electrode lead is attached to the electrode assembly, and

the other end of the vent member is located in the sealing portion at a corner of the case adjacent to where the electrode lead is exposed to the outside.

6 . The secondary battery according to claim 1 ,

wherein the vent member has a lower melting point than the sealant resin, and wherein the melting point of the vent member is between 100° C. and 130° C.

7 . The secondary battery according to claim 1 ,

wherein the vent member is vented at a temperature between 100° C. and 120° C., and/or wherein the vent member is vented at a pressure of 1.5 atm or above.

8 . The secondary battery according to claim 1 ,

wherein the vent member has a maximum sealing strength of less than 6 kgf/15 mm at 100° C. or above.

9 . The secondary battery according to claim 1 ,

wherein the vent member has an average sealing strength of less than 4.5 kgf/15 mm at 100° C. or above.

10 . The secondary battery according to claim 1 ,

wherein the vent member has a maximum sealing strength of greater than 6 kgf/15 between room temperature and 60° C.

11 . The secondary battery according to claim 1 ,

wherein the vent member has an average sealing strength of 4.5 kgf/15 mm or more between room temperature and 60° C.

12 . The secondary battery according to claim 1 ,

wherein the vent member contains a linear low-density polyethylene having a comonomer with a carbon number of 6 or more.

13 . The secondary battery according to claim 12 ,

wherein the linear low-density polyethylene having a comonomer with a carbon number of 6 or more is polymerized in the presence of a metallocene catalyst.

14 . The secondary battery according to claim 12 ,

wherein in the linear low-density polyethylene having a comonomer with a carbon number of 6 or more, a content of the comonomer with a carbon number of 6 or more is 15 weight % or less, based on 100 weight % of the linear low-density polyethylene having a comonomer with a carbon number of 6 or more.

15 . The secondary battery according to claim 12 ,

wherein the linear low-density polyethylene having a comonomer with a carbon number of 6 or more has a poly dispersity index (PDI) of 4 or less.

16 . The secondary battery according to claim 12 ,

wherein the case includes a sealing portion containing a sealant resin and is formed to seal the electrode assembly within the case, and

a difference between a crystallization temperature of the sealant resin and a crystallization temperature of the linear low-density polyethylene having a comonomer with a carbon number of 6 or more is 10° C. or less.

17 . The secondary battery according to claim 16 ,

wherein the linear low-density polyethylene having a comonomer with a carbon number of 6 or more has a crystallization temperature of 90° C. to 115° C.

18 . The secondary battery according to claim 12 ,

wherein the linear low-density polyethylene having a comonomer with a carbon number of 6 or more has a weight-average molecular weight of 100,000 g/mol to 400,000 g/mol.

19 . The secondary battery according to claim 1 ,

wherein the secondary battery is a pouch-type secondary battery.