Secondary Battery

Patent metadata

Field	Value
Publication number	US-2024014506-A1
Application number	US-202218035232-A
Country	US
Kind code	A1
Filing date	Apr 15, 2022
Priority date	Apr 15, 2021
Publication date	Jan 11, 2024
Grant date	—

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.

First claim

1 . A secondary battery, comprising:
an electrode assembly, a case for accommodating the electrode assembly; and a vent member, wherein 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.

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 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 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 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.

4 . The secondary battery according to claim 3 ,
wherein the other end of the vent member is located in the sealing portion.

5 . The secondary battery according to claim 4 ,
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.

6 . The secondary battery according to claim 4 ,
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.

7 . The secondary battery according to claim 3 ,
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.

8 . 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.

9 . (canceled)

10 . 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.

11 . 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.

12 . 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.

13 . 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.

14 . 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.

15 . The secondary battery according to claim 14 ,
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.

16 . The secondary battery according to claim 14 ,
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.

17 . The secondary battery according to claim 14 ,
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.

18 . The secondary battery according to claim 14 ,
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.

19 . The secondary battery according to claim 18 ,
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.

20 . The secondary battery according to claim 14 ,
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.

21 . (canceled)

22 . The secondary battery according to claim 1 ,
wherein the secondary battery is a pouch-type secondary battery.

Assignees

• Lg Energy Solution Ltd

Inventors

• Lim Hun-Hee
• Kim Sang-Hun
• Kang Min-Hyeong
• Song Dae-Woong
• Yu Hyung-Kyun
• Hwang Soo-Ji

Classifications

• H01M50/375 Primary

  Vent means sensitive to or responsive to temperature · CPC title

• H01M50/105

  Pouches or flexible bags · CPC title

• H01M50/3425

  in the form of rupturable membranes or weakened parts, e.g. pierced with the aid of a sharp member · CPC title

• H01M50/342 Primary

  Non-re-sealable arrangements · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title