CN-122025725-A - Method and mold for sealing pouch-type battery and pouch-type battery

CN122025725ACN 122025725 ACN122025725 ACN 122025725ACN-122025725-A

Abstract

Methods and molds for sealing a pouch-type battery and pouch-type batteries are disclosed. The method for sealing a pouch type battery includes a top sealing operation including sealing an upper region of a sealing part of a pouch above an electrode assembly receiving part thereof, an electrolyte injection post-sealing operation including sealing a region of the sealing part at one side of the electrode assembly receiving part after injecting an electrolyte into an electrode assembly, and a degassing post-sealing operation including sealing a remaining region of the sealing part at the other side of the electrode assembly receiving part opposite to the one side after removing a gas from the electrode assembly receiving part. In the top sealing operation, a gap between the sealing part and the electrode assembly receiving part is substantially the same at each upper corner of the electrode assembly receiving part and at an upper region between the upper corners of the electrode assembly receiving part.

Inventors

LI JIXIAN
Zheng Canyun
SONG HAOZHEN
ZHANG YUNZHU

Assignees

三星SDI株式会社

Dates

Publication Date: 20260512
Application Date: 20250521
Priority Date: 20241112

Claims (12)

1. A method for sealing a pouch-type battery including a pouch having a sealing portion and an electrode assembly receiving portion, the method comprising: a top sealing operation including sealing an upper region of the sealing portion above the electrode assembly receiving portion; an electrolyte post-injection sealing operation including sealing a region of the sealing part at one side of the electrode assembly receiving part after injecting an electrolyte into the electrode assembly received in the electrode assembly receiving part, and A post-venting sealing operation including sealing a remaining region of the sealing part at the other side of the electrode assembly receiving part opposite to the one side after removing gas from the electrode assembly receiving part, Wherein in the top sealing operation, a gap between the sealing part and the electrode assembly receiving part is the same at each upper corner of the electrode assembly receiving part and at an upper region between the upper corners of the electrode assembly receiving part.
2. The method of claim 1, wherein the top sealing operation is performed using a top sealing die, Wherein the top sealing mold has a contact portion configured to contact the bag and apply pressure to the bag to seal the bag and a body configured to support the contact portion, and Wherein the contact portion has a curved formation portion formed at each of two corners thereof.
3. The method according to claim 2, wherein in the top sealing operation, the bent forming portion forms a bent portion at a portion of the sealing portion corresponding to the upper corner of the electrode assembly receiving portion such that the gap between the sealing portion and the electrode assembly receiving portion is the same at the upper corner of the electrode assembly receiving portion and at other regions of the electrode assembly receiving portion.
4. The method of claim 2, wherein the bend-forming portion has the same radius of curvature as the upper corner of the electrode assembly receiving portion.
5. The method of claim 2, wherein the contact has an upper region configured to seal an upper portion of the pouch and two protruding regions protruding downward from the upper region to extend around the upper corner of the electrode assembly receiving portion, and Wherein the bend-forming portion is at the corner where each of the two convex regions of the contact portion intersects the upper region.
6. The method according to claim 1, wherein in the electrolyte injection-after-sealing operation, the one side of the electrode assembly receiving part, a side of the auxiliary space of the pouch for electrolyte injection and exhaust, and a protruding region protruding from upper and lower portions of the other side of the electrode assembly receiving part to a predetermined length are sealed.
7. The method of claim 6, wherein the other side of the electrode assembly receiving part that is not sealed is sealed in the post-venting sealing operation.
8. A mold for sealing a pouch type battery including a pouch including a sealing part and an electrode assembly receiving part, the mold comprising: a contact portion configured to contact the bag and apply pressure to the bag to seal the sealing portion of the bag, and A body configured to support the contact portion, Wherein the contact portion has a curved formation portion at each of two corners thereof.
9. The mold according to claim 8, wherein the bending forming portion is configured to form a bending portion at a portion of the sealing portion corresponding to each upper corner of the electrode assembly receiving portion such that a gap between the sealing portion and the electrode assembly receiving portion is the same at the upper corner of the electrode assembly receiving portion and at other regions of the electrode assembly receiving portion.
10. The mold according to claim 8, wherein the bend-forming portion has the same radius of curvature as each upper corner of the electrode assembly receiving portion.
11. The mold according to claim 8, wherein the contact portion includes an upper region configured to seal an upper portion of the pouch and two protruding regions protruding downward from the upper region to extend around an upper corner of the electrode assembly receiving portion, and Wherein the bend-forming portion is at the corner where each of the two convex regions of the contact portion intersects the upper region.
12. A pouch-type battery, comprising: Electrode assembly, and A pouch accommodating the electrode assembly, the pouch having a sealing part and an electrode assembly receiving part, the pouch being sealed by the method according to any one of claims 1 to 7.

Description

Method and mold for sealing pouch-type battery and pouch-type battery The present application claims priority and benefit from korean patent application No. 10-2024-0160594 filed on the 11 th month 12 of 2024 in korean intellectual property office, the entire disclosure of which is incorporated herein by reference. Technical Field Aspects of embodiments of the present disclosure relate to a method and a mold for sealing a pouch type battery, and a pouch type battery. Background Unlike primary batteries, which are not designed to be charged, secondary batteries are designed to be discharged and recharged. Low-capacity secondary batteries are used for small-sized portable electronic devices such as smart phones, function phones, notebook computers, digital cameras, and video cameras, and large-capacity secondary batteries are widely used as power sources for driving motors such as in hybrid vehicles or electric vehicles and for electric power storage. The secondary battery may generally include an electrode assembly including (or consisting of) a positive electrode plate and a negative electrode plate, a case accommodating the electrode assembly, and an electrode terminal connected to the electrode assembly. The pouch-type battery includes an electrode assembly and a pouch accommodating the electrode assembly. In the conventional pouch-type monomer assembly process, the sealing process is a process of sealing two pouches (e.g., two half pouches) by hot pressing. However, if the sealing is not sufficiently performed, water may penetrate into the bag (particularly in a high-temperature and high-humidity environment), which may cause problems such as leakage of the bag, penetration of water into the monomer, or expansion. The above information disclosed in this background section is for enhancement of understanding of the background of the present disclosure and, therefore, it may contain information that does not form a related (or prior) art. Disclosure of Invention Embodiments of the present disclosure relate to a method and a mold for sealing a pouch type battery, which ensure reliable pouch sealing, and a pouch type battery manufactured by using the method and the mold. Embodiments of the present disclosure also relate to a method and a mold for sealing a pouch type battery, which prevent or reduce pouch leakage, water penetration, and swelling phenomena, and a pouch type battery manufactured by using the method and the mold. According to an embodiment of the present disclosure, a method for sealing a pouch type battery is provided. The pouch-type battery includes a pouch having a sealing part and an electrode assembly receiving part. The method includes a top sealing operation including sealing an upper region of the sealing part above the electrode assembly receiving part, an electrolyte injection post-sealing operation including sealing a region of the sealing part along one side of the electrode assembly receiving part after injecting an electrolyte into the electrode assembly, and a degassing post-sealing operation including sealing a remaining region of the sealing part along the other side of the electrode assembly receiving part opposite to the one side after removing a gas from the electrode assembly receiving part. In the top sealing operation, a gap between the sealing part and the electrode assembly receiving part is substantially the same at each upper corner of the electrode assembly receiving part and at an upper region between the upper corners of the electrode assembly receiving part. The top sealing operation may be performed using a top sealing die. The top sealing mold may have a contact portion configured to contact the bag and apply pressure to the bag to seal the sealing portion, and a body configured to support the contact portion. The contact portion may have a curved formation portion at each of two corners thereof. In the top sealing operation, the bent forming portion may form a bent portion at a portion of the sealing part corresponding to the upper corner of the electrode assembly receiving part such that the gap between the sealing part and the electrode assembly receiving part is substantially the same at the upper corner of the electrode assembly receiving part and at other regions of the electrode assembly receiving part. The curved forming portion may have substantially the same radius of curvature as the upper corner of the electrode assembly receiving part. The contact part may have an upper region configured to seal an upper portion of the pouch and two protruding regions protruding downward from the upper region to extend around the upper corner of the electrode assembly receiving part. The curvature forming portion may be formed at the corner where each of the two convex regions of the contact portion intersects the upper region. The electrolyte injection-post sealing operation may be performed to seal the sealing part along the one side of the electrode assembly rece