Battery Cell and Battery Module Comprising Same

Patent metadata

Field	Value
Publication number	US-2024266644-A1
Application number	US-202318565942-A
Country	US
Kind code	A1
Filing date	Jan 20, 2023
Priority date	Jan 24, 2022
Publication date	Aug 8, 2024
Grant date	—

Abstract

Disclosed is a battery cell, which includes a battery case having an accommodation portion in which an electrode assembly is mounted, and a sealing portion formed by sealing an outer periphery thereof. The battery case further includes an electrode lead electrically connected to an electrode tab included in the electrode assembly and protruding out of the battery case through the sealing portion, and a lead film located at a portion corresponding to the sealing portion in at least one of an upper portion and a lower portion of the electrode lead. The lead film has a dented portion recessed in an outer direction of the battery case and opened toward the inside of the battery case. The battery cell also has a coating layer located on a gas discharge portion of the lead film that contains a fluorine-based polymer.

First claim

1 . A battery cell, comprising:
a battery case having an accommodation portion in which an electrode assembly is mounted, and a sealing portion formed by sealing an outer periphery thereof; an electrode lead electrically connected to an electrode tab included in the electrode assembly and protruding out of the battery case through the sealing portion; a lead film located at a portion corresponding to the sealing portion in at least one of an upper portion or a lower portion of the electrode lead, the lead film having a dented portion recessed in an outer direction of the battery case and opened toward the accommodation portion of the battery case; the lead film covers a front surface of the dented portion and an upper surface of the dented portion based on the protruding direction of the electrode lead, the gas generated inside the battery case is discharged to the outside of the battery case through the dented portion and the lead film covering the upper surface of the dented portion, and a coating layer located on a gas discharge portion of the lead film, the coating layer containing a fluorine-based polymer.

2 . The battery cell according to claim 1 ,
wherein the gas discharge portion of the lead film is located outside an outer surface of the battery case.

3 . A battery cell, comprising:
a battery case having an accommodation portion in which an electrode assembly is mounted, and a sealing portion formed by sealing an outer periphery thereof; an electrode lead electrically connected to an electrode tab included in the electrode assembly and protruding out of the battery case through the sealing portion; a lead film located at a portion corresponding to the sealing portion in at least one of an upper portion or a lower portion of the electrode lead, the lead film having a dented portion recessed in an outer direction of the battery case and opened toward the accommodation portion of the battery case, and a coating layer located on a gas discharge portion of the lead film, the coating layer containing a fluorine-based polymer, wherein the dented portion includes a first dented portion and a second dented portion, and the second dented portion has a greater width than the first dented portion.

4 . The battery cell according to claim 3 ,
wherein the second dented portion is located farther from the accommodation portion than the first dented portion.

5 . The battery cell according to claim 3 ,
wherein a part of the first dented portion is located in an area corresponding to the sealing portion.

6 . The battery cell according to claim 3 ,
wherein a part of the second dented portion is located in an area that does not correspond to the sealing portion.

7 . The battery cell according to claim 3 ,
wherein an end of the second dented portion is located outside an outer surface of the battery case.

8 . The battery cell according to claim 3 ,
wherein the second dented portion is located between an end of the sealing portion and an end of the lead film.

9 . The battery cell according to claim 3 ,
wherein the coating layer is located on the second dented portion.

10 . The battery cell according to claim 3 ,
wherein the first dented portion extends along a protruding direction of the electrode lead, and the second dented portion extends along a longitudinal direction of the sealing portion.

11 . The battery cell according to claim 1 ,
wherein the fluorine-based polymer includes a polymer containing repeating units derived from tetrafluoroethylene, vinyl fluoride, vinylidene fluoride, or monomers of a combination thereof.

12 . (canceled)

13 . A battery cell, comprising:
a battery case having an accommodation portion in which an electrode assembly is mounted, and a sealing portion formed by sealing an outer periphery thereof; an electrode lead electrically connected to an electrode tab included in the electrode assembly and protruding out of the battery case through the sealing portion; a lead film located at a portion corresponding to the sealing portion in at least one of an upper portion or a lower portion of the electrode lead, the lead film having a dented portion recessed in an outer direction of the battery case and opened toward the accommodation portion of the battery case, and a coating layer located on a gas discharge portion of the lead film, the coating layer containing a fluorine-based polymer, wherein based on a protruding direction of the electrode lead, an inner surface of the dented portion is closed.

14 . The battery cell according to claim 13 , further comprising:
an inner layer configured to cover at least one inner surface of the dented portion of the lead film.

15 . The battery cell according to claim 14 ,
wherein the inner layer comprises a material having a higher melting point than the lead film, and the material of the inner layer does not react with an electrolyte.

16 . (canceled)

17 . The battery cell according to claim 15 ,
wherein the material of the inner layer includes at least one polyolefin-based, fluorine-based, or porous ceramic-based materials.

18 . The battery cell according to claim 1 ,
wherein the dented portion is located on the electrode lead.

19 . The battery cell according to claim 1 ,
wherein a length of the lead film is greater than a width of the electrode lead.

20 . The battery cell according to claim 19 ,
wherein the dented portion is located between an end of the electrode lead and an end of the lead film.

21 . The battery cell according to claim 1 ,
wherein an end of the dented portion that is open toward the accommodation portion of the battery case is located inward of an innermost surface of the sealing portion of the battery case.

22 . (canceled)

23 . (canceled)

24 . (canceled)

25 . (canceled)

26 . A battery module, comprising the battery cell according to claim 1 .

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

• H01M50/186

  characterised by the disposition of the sealing members · CPC title

• H01M50/193

  Organic material · CPC title

• H01M50/231

  having a layered structure · CPC title

• H01M50/30

  Arrangements for facilitating escape of gases · CPC title

• H01M50/178 Primary

  for pouch or flexible bag cells · CPC title