Pouch-shaped secondary battery sealing apparatus and pouch-shaped secondary battery manufacturing method

Patent metadata

Field	Value
Publication number	US-12562416-B2
Application number	US-202117913594-A
Country	US
Kind code	B2
Filing date	Feb 16, 2021
Priority date	Jun 18, 2020
Publication date	Feb 24, 2026
Grant date	Feb 24, 2026

Abstract

The present invention relates to a pouch-shaped secondary battery sealing apparatus and a pouch-shaped secondary battery manufacturing method capable of radiating an infrared laser to a sealed portion in an overlapping state, whereby it is possible to increase sealing force, to prevent occurrence of wrinkles, and to reduce sealing time when forming a sealed portion of a pouch-shaped secondary battery case.

First claim

The invention claimed is:

1 . A pouch-shaped secondary battery sealing apparatus comprising:
a pressing portion configured to be disposed above or below a sealed portion of a pouch-shaped secondary battery case comprising a metal layer, the pressing portion being made of a material capable of transmitting infrared light therethrough; a first infrared light radiation portion configured to radiate the infrared light to the pressing portion; and a second infrared light radiation portion configured to radiate the infrared light to overlap a radiation area of the first infrared light radiation portion, wherein the first infrared light radiation portion and the second infrared light radiation portion are both located above the pressing portion or are both located below the pressing portion.

2 . A secondary battery manufacturing method comprising:
receiving an electrode assembly in a secondary battery case made of a laminate sheet comprising an outer resin layer, a metal layer, and an inner sealant layer, the secondary battery case comprising an electrode assembly receiving portion and a sealed portion surrounding the electrode assembly receiving portion; and pressing the sealed portion with a pressing portion while heating the sealed portion using a first infrared light radiation portion and a second infrared light radiation portion to seal the sealed portion, wherein the first infrared light radiation portion and the second infrared light radiation portion radiate infrared light to a same surface of the pressing portion, and radiation areas of the first infrared light radiation portion and the second infrared light radiation portion of the pressing portion overlap each other, and wherein the first infrared light radiation portion and the second infrared light radiation portion heat the metal layer such that the inner sealant layer is melted by heat conducted from the metal layer.

3 . The secondary battery manufacturing method according to claim 2 , wherein at least one of the first infrared light radiation portion and the second infrared light radiation portion is configured to radiate an LD wavelength (808 nm to 980 nm).

4 . The secondary battery manufacturing method according to claim 2 , wherein the pressing portion is made of a quartz lens.

5 . The secondary battery manufacturing method according to claim 2 , wherein at least one of the first infrared light radiation portion or the second infrared light radiation portion comprises:
a light source configured to radiate a laser; and an adjustment lens located under the light source.

6 . The secondary battery manufacturing method according to claim 5 , wherein the adjustment lens has a cylindrical shape.

7 . The secondary battery manufacturing method according to claim 5 , wherein a surface of the adjustment lens that faces the light source is convex.

8 . The secondary battery manufacturing method according to claim 2 , wherein at least one of the first infrared light radiation portion or the second infrared light radiation portion is configured to have an infrared light radiation output density of 80 W/cm 2 or more.

9 . The secondary battery manufacturing method according to claim 2 , wherein the first infrared light radiation portion and the second infrared light radiation portion are each configured to heat an aluminum layer or an aluminum alloy layer of the secondary battery case.

10 . The secondary battery manufacturing method according to claim 2 , wherein the pressing portion is a first pressing portion configured to be disposed above the sealed portion of the secondary battery case,
the apparatus further comprising a second pressing portion configured to be disposed below the sealed portion of the secondary battery case, the second pressing portion having a respective first infrared light radiation portion and a respective second infrared light radiation portion each configured to radiate the infrared light to the second pressing portion.

11 . The secondary battery manufacturing method according to claim 2 , wherein the metal layer is made of aluminum or an aluminum alloy.

12 . The secondary battery manufacturing method according to claim 2 , wherein, during the pressing of the sealed portion, the metal layer is heated to a temperature of 180° C. to 300° C.

Assignees

• Lg Energy Solution Ltd

Inventors

• Baek Ju Hwan
• Lee Seung Bae
• Oh Jung Su

Classifications

• H01M50/178

  for pouch or flexible bag cells · CPC title

• H01M50/126

  comprising three or more layers · CPC title

• H01M50/186

  characterised by the disposition of the sealing members · CPC title

• H01M50/105 Primary

  Pouches or flexible bags · CPC title

• B29C65/16

  Laser beams · CPC title