CN-122003321-A - Pouch-type battery case sealing apparatus and sealing method using the same

Abstract

Disclosed is a sealing apparatus for sealing a sealing part of a battery case having an electrode assembly received therein, the sealing apparatus including a first sealing unit located on one side of the sealing part of the battery case, and a second sealing unit located on the other side of the sealing part of the battery case, wherein the first sealing unit includes a first heating block configured to be heated to a certain temperature, a first supporting block in close contact with the first heating block, a first sealing tool positioned in close contact with one surface of the first supporting block, the first sealing tool configured to press one surface of the sealing part, and a pair of first stoppers located on both sides of the first supporting block so as to be rotatably coupled to the first supporting block, each of the first stoppers having a contact surface inclined to have a different height along a circumferential surface thereof.

Inventors

• ZHENG YUTING

Assignees

• 株式会社LG新能源

Dates

Publication Date

20260508

Application Date

20250613

Priority Date

20240904

Claims (12)

1. 1. A sealing apparatus for sealing a sealing portion of a battery case having an electrode assembly received in the battery case, the sealing apparatus comprising: a first sealing unit located on one side of the sealing part of the battery case, and A second sealing unit on the other side of the sealing part of the battery case, wherein The first sealing unit includes: A first heating block configured to be heated to a temperature; A first support block in close contact with the first heating block; A first sealing tool positioned in close contact with one surface of the first support block so as to press one surface of the sealing portion, and A pair of first stoppers located on both sides of the first support block so as to be rotatably coupled to the first support block, each of the first stoppers having a contact surface inclined to have a different height along a circumferential surface of each of the pair of first stoppers.
2. 2. The sealing apparatus of claim 1, wherein, The second sealing unit includes a second stopper closely contacting the contact surface of the first stopper, and The contact surface of the first stopper and the second stopper are in line contact or point contact with each other.
3. 3. The sealing apparatus according to claim 2, wherein the second sealing unit includes: A second heating block configured to be heated to a temperature; A second support block in close contact with the second heating block; A second sealing tool positioned in close contact with one surface of the second support block so as to press the other surface of the sealing portion, and And a pair of second stopping parts positioned on two sides of the second supporting block.
4. 4. A sealing apparatus according to claim 3, wherein one end of the second stopper has a blade-like shape having an inclined surface so as to be in line contact with the contact surface of the first stopper.
5. 5. A sealing apparatus according to claim 3, wherein one end of the second stopper has a hemispherical shape so as to be in point contact with the contact surface of the first stopper.
6. 6. The sealing apparatus of claim 2, wherein, An insertion hole is provided in the center of the contact surface of the first stopper, and The insertion hole receives therein a fastening member configured to connect the first support block and the first stopper to each other.
7. 7. The sealing apparatus of claim 6, wherein the fastening member is a bolt.
8. 8. The sealing apparatus of claim 7, wherein, The insertion hole accommodates therein a package member, and The fastening member is fastened to the first support block after passing through the encapsulation member.
9. 9. The sealing apparatus of claim 8, wherein the encapsulation member is made of an elastic material.
10. 10. The sealing apparatus of claim 9, wherein the encapsulation member comprises rubber or silicone.
11. 11. The sealing apparatus of claim 4, wherein a radially shaped marker is provided on the contact surface.
12. 12. A sealing method using the sealing apparatus according to any one of claims 1 to 11, the sealing method comprising the steps of: (S1) adjusting a contact position of the first stopper and the second stopper so as to correspond to a thickness of the sealing portion; (S2) positioning the seal between the first and second sealing tools, and (S3) pressing and heating the sealing portion by the first sealing tool and the second sealing tool to seal the sealing portion.

Description

Pouch-type battery case sealing apparatus and sealing method using the same Technical Field The present application claims priority from korean patent application No. 2024-019671 filed on month 4 of 2024, 9, the disclosure of which is incorporated herein by reference in its entirety. The present invention relates to a pouch battery case sealing apparatus and a sealing method using the same, and more particularly, to a pouch battery case sealing apparatus and a sealing method using the same, which are capable of adjusting the height of a stopper such that the distance between a pair of sealing tools corresponds to the thickness of a sealing part of a pouch battery case. Background As the technology of mobile devices has been developed and the demand thereof has increased, secondary batteries capable of being charged and discharged have been used as energy sources for various mobile devices. Energy sources of electric vehicles and hybrid electric vehicles proposed as secondary batteries as alternatives to existing gasoline vehicles and diesel vehicles using fossil fuel have also attracted attention. Secondary batteries are classified into cylindrical batteries having an electrode assembly mounted in a cylindrical metal can, prismatic batteries having an electrode assembly mounted in a prismatic metal can, and pouch-shaped batteries having an electrode assembly mounted in a pouch-shaped case made of an aluminum laminate sheet, according to the shape of a battery case. In a typical pouch-shaped secondary battery manufacturing process, the steps of inserting an electrode assembly into a receiving space of a battery case made of a laminate sheet, injecting an electrolyte solution into the battery case, and sealing the battery case are sequentially performed. Fig. 1 is a view showing a conventional pouch-shaped battery case sealing apparatus sealing a secondary battery. Referring to fig. 1, the conventional pouch-shaped battery case sealing apparatus includes upper and lower clamps 1 and 2 respectively located above and below a sealing part S of a battery case 12, and the battery case 12 has an electrode assembly 11 received therein. The upper and lower clamps 1 and 2 are moved toward each other while applying a certain pressure and temperature to the sealing portion S to seal the sealing portion. At this time, the sealing parts S are heated and pressed at the same pressure regardless of the thickness of the sealing parts S of the pouch-shaped battery case 12, thereby causing uneven engagement of the sealing parts S having different thicknesses, and thus, quality variation occurs. To solve this problem, korean patent application laid-open No. 10-2024-0082572 discloses a top sealing device for pouch-shaped battery cells, in which a gasket ring configured to adjust the distance between a pair of sealing blocks is interposed between the pair of sealing blocks so as to adjust the thickness of a sealing part S. However, each time the distance is adjusted according to the thickness of the sealing portion S, it is necessary to insert or remove the gasket ring between or from the pair of sealing blocks, which is troublesome, thereby reducing work continuity and efficiency. In particular, in order to stepwise adjust the distance between a pair of sealing blocks, gasket rings of various heights must be provided, resulting in significant cost expenditure. (Prior art literature) (Patent document 1) Korean patent application laid-open No. 10-2024-0082572 Disclosure of Invention Technical problem The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a pouch-shaped battery case sealing apparatus capable of easily adjusting a distance between a pair of sealing tools so as to correspond to a thickness of a sealing part of a pouch-shaped battery case, and a sealing method using the same. Another object of the present invention is to provide a pouch-shaped battery case sealing apparatus capable of minimizing installation and maintenance costs of the apparatus and a sealing method using the same. Technical proposal A sealing apparatus for achieving the above object according to the present invention is a sealing apparatus for sealing a sealing part of a battery case having an electrode assembly received therein, the sealing apparatus including a first sealing unit (100) located on one side of the sealing part of the battery case and a second sealing unit (200) located on the other side of the sealing part of the battery case, wherein the first sealing unit (100) includes a first heating block (110) configured to be heated to a certain temperature, a first supporting block (120) in close contact with the first heating block (110), a first sealing tool (130) positioned in close contact with one surface of the first supporting block (120), the first sealing tool being configured to press one surface of the sealing part, and a pair of first stoppers (140) located