Battery cell and battery module including the same

Patent metadata

Field	Value
Publication number	US-12132215-B2
Application number	US-202218021439-A
Country	US
Kind code	B2
Filing date	Jan 11, 2022
Priority date	Jan 11, 2021
Publication date	Oct 29, 2024
Grant date	Oct 29, 2024

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 by heat fusion; an electrode lead electrically connected to an electrode tab included in the electrode assembly and protruding out of the battery case via 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, wherein the lead film has a dented portion recessed toward an inside of the battery case, and the dented portion is opened toward an outside of the battery case.

First claim

What is claimed is:

1. A battery cell, comprising:
a battery case having an accommodation portion in which an electrode assembly is mounted, and a sealing portion at an outer periphery of the battery case, the sealing portion having a heat fusion sealed structure;
an electrode lead electrically connected to an electrode tab of the electrode assembly, the electrode lead protruding out of the battery case through the sealing portion; and
a lead film extending within the sealing portion adjacent to an upper portion and a lower portion of the electrode lead, the lead film encircling the electrode lead and adhered to the sealing portion of the battery case,
wherein the lead film has a dented portion recessed toward an inside of the battery case, the dented portion having a closed inner end adjacent to the inside of the battery case and an open outer end adjacent to an outside of the battery case, the lead film surrounding the closed inner end of the dented portion,
wherein the lead film surrounds a rear surface of the dented portion and an upper surface of the dented portion based on the protruding direction of the electrode lead, and
wherein the dented portion recessed into the lead film extends completely through the sealing portion of the battery case in an extension direction of the electrode lead.

2. The battery cell according to claim 1 , wherein the lead film further comprises an inner layer covering at least one part of inner surfaces of the dented portion of the lead film.

3. The battery cell according to claim 2 , wherein a material of the inner layer has a first melting point that is higher than a second melting point of a material of the lead film, and the material of the inner layer is configured to be non-reactive with an electrolytic solution.

4. The battery cell according to claim 2 , wherein the inner layer contains at least one of polyolefin-based materials, fluorine-based materials or porous ceramic-based materials.

5. The battery cell according to claim 1 , wherein the lead film contains a polyolefin-based material.

6. The battery cell according to claim 1 , wherein the dented portion overlies the electrode lead.

7. The battery cell according to claim 1 , wherein the lead film has a length in a longitudinal direction of the sealing portion greater than a width of the electrode lead in the longitudinal direction.

8. The battery cell according to claim 7 , wherein the dented portion is located between an outer end of the electrode lead at the outside of the battery case and an inner end of the lead film at the inside of the battery case.

9. The battery cell according to claim 1 , wherein the lead film includes a first lead film portion and a second lead film portion, the first lead film portion is located adjacent to an upper surface of the electrode lead, and the second lead film portion is located adjacent to a lower surface of the electrode lead.

10. The battery cell according to claim 9 , wherein the electrode lead is located between the first lead film portion and the second lead film portion, and the first lead film portion and the second lead film portion are connected to each other at opposite sides of the electrode lead.

11. The battery cell according to claim 9 , wherein the dented portion extends within at least one of the first lead film portion or the second lead film portion.

12. The battery cell according to claim 1 , wherein the closed inner end of the dented portion recessed into the lead film extends beyond an inner surface of the battery case closer to the electrode assembly than an inner edge of the sealing portion.

13. The battery cell according to claim 12 , wherein the open outer end of the dented portion extends beyond an outer surface of the battery case and is farther from the electrode assembly than an outer edge of the sealing portion.

14. The battery cell according to claim 1 , wherein the lead film is configured to have a moisture penetration amount of 0.02 g to 0.2 g for 10 years at 25° C., 50% RH.

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

16. The battery cell according to claim 1 , wherein the lead film is configured to receive an outflow of a gas from an interior of the battery case through the dented portion.

17. A battery cell, comprising:
a battery case having an accommodation portion in which an electrode assembly is mounted, and a sealing portion at an outer periphery of the battery case, the sealing portion having a heat fusion sealed structure;
an electrode lead electrically connected to an electrode tab of the electrode assembly, the electrode lead protruding out of the battery case through the sealing portion; and
a lead film extending within the sealing portion adjacent to at least one of an upper portion or a lower portion of the electrode lead,
wherein the lead film has a dented portion recessed toward an inside of the battery case, the dented portion having a closed inner end adjacent to the inside of the battery case and an open outer end adjacent to an outside of the battery case,
wherein the lead film surrounds a rear surface of the dented portion and an upper surface of the dented portion based on the protruding direction of the electrode lead,
wherein the dented portion recessed into the lead film extends completely through the sealing portion of the battery case in an extension direction of the electrode lead, and
wherein the dented portion includes a first dented portion and a second dented portion, the first dented portion has a longitudinal axis extending along a protruding direction of the electrode lead, and the second dented portion has a longitudinal axis extending along a longitudinal direction of the sealing portion.

18. The battery cell according to claim 17 , wherein the lead film has a width in a lateral direction of the sealing portion perpendicular to the longitudinal direction greater than a width of the sealing portion and smaller than a length of the electrode lead in the lateral direction.

19. The battery cell according to claim 18 , wherein the second dented portion is located between an inner end of the sealing portion adjacent to the inside of the battery case and an inner end of the lead film adjacent to the inside of the battery case.

20. A battery cell, comprising:
a battery case having an accommodation portion in which an electrode assembly is mounted, and a sealing portion at an outer periphery of the battery case, the sealing portion having a heat fusion sealed structure;
an electrode lead electrically connected to an electrode tab of the electrode assembly, the electrode lead protruding out of the battery case through the sealing portion; and
a lead film extending within the sealing portion adjacent to at least one of an upper portion or a lower portion of the electrode lead,
wherein the lead film has a dented portion recessed toward an inside of the battery case, the dented portion having a closed inner end adjacent to the inside of the battery case and an open outer end adjacent to an outside of the battery case,
wherein the lead film surrounds a rear surface of the dented portion and an upper surface of the dented portion based on the protruding direction of the electrode lead,
wherein the dented portion recessed into the lead film extends completely through the sealing portion of the battery case in an extension direction of the electrode lead, and
wherein the lead film has a gas permeability of 20 Barrer to 60 Barrer at 60° C.

Assignees

• Lg Energy Solution Ltd

Inventors

• Lim Hun-Hee
• Kim Sang-Hun
• Hwang Soo-Ji
• Kang Min-Hyeong
• Park Eun-Suk
• Yu Hyung-Kyun

Classifications

• H01M50/133

  Thickness · CPC title

• H01M50/534

  characterised by the material of the leads or tabs · CPC title

• H01M50/105

  Pouches or flexible bags · CPC title

• H01M50/178 Primary

  for pouch or flexible bag cells · CPC title

• H01M50/538

  Connection of several leads or tabs of wound or folded electrode stacks · CPC title