Patents by Inventor Jee Eun Jang

Jee Eun Jang has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20250219200
    Abstract: Disclosed are an apparatus and a method for sealing a pouch type secondary battery. Insulation defects are prevented and a long-term reliability, such as a chemical resistance, is improved by evenly forming a polymer material pushed from a sealed portion in a tab part even in an unsealed portion to prevent a thickness of a sealant layer from being smaller when a pouch outer material and a lead tab film are sealed in accommodating a secondary battery by using a pouch outer material including a pouch film stack.
    Type: Application
    Filed: December 21, 2024
    Publication date: July 3, 2025
    Applicant: YOULCHON CHEMICAL CO., LTD.
    Inventors: Jong Hyuk JUNG, Nok Jung SONG, Hee Sik HAN, Jin Ho KIM, Jee Eun JANG, Han Chul PARK, Sung Chul SHIN
  • Publication number: 20240396131
    Abstract: The specification discloses a film for a cell pouch and a storage method of the film. According to this disclosure, the efficiency of a slip agent may be improved by controlling the storage temperature after manufacturing the film for a cell pouch. The phenomenon of excessive leakage of the slip agent on the surface is minimized while comprising a small amount of the slip agent. Therefore, the film according to the present disclosure may exhibit excellent formability and at the same time prevents excessive leakage of the slip agent, thereby preventing a decrease in process efficiency due to the slip agent.
    Type: Application
    Filed: May 23, 2024
    Publication date: November 28, 2024
    Applicant: Youlchon Chemical Co., Ltd.
    Inventors: Nok Jung Song, Hee Sik Han, Huihun Kim, Jee Eun Jang, Doohee Lee, Sung Chul Shin, Moonkyu Song
  • Publication number: 20240222757
    Abstract: Disclosed is a secondary electrode pouch film comprising at least an outer layer, a barrier layer, and a sealant layer laminated sequentially, wherein the sealant layer thickness T1 and T2 measured according to a tear test method satisfy 0.6<T1/T2<0.85 or 30 ?m<T2?T1<85 ?m, respectively, a secondary battery using the same, and a method for preparing the same. The pouch film has excellent sealing strength at ambient temperature and high temperature, as well as excellent sealing strength maintenance characteristics at ambient temperature, and especially excellent sealing strength maintenance characteristics at high temperature.
    Type: Application
    Filed: December 28, 2023
    Publication date: July 4, 2024
    Applicant: Youlchon Chemical Co., Ltd.
    Inventors: Nok Jung Song, Hee Sik Han, Doohee Lee, Jee Eun Jang, Yoohan Kim, Sung Chul Shin, Moonkyu Song
  • Publication number: 20240222749
    Abstract: A pouch film for a secondary battery, wherein at least an outer layer, a barrier layer, and a sealant layer are structured in this order, the sealant layer includes an extrusion (EC) layer and a polypropylene (PP) layer below the extrusion (EC) layer, having excellent sealing strength at ambient and high temperatures, and having excellent sealing strength maintenance properties at ambient and especially high temperatures, a method for preparing the pouch film, a secondary battery using the pouch film, and a method for manufacturing the same are disclosed. The pouch film for the secondary battery has excellent high temperature long-term reliability in battery pack manufacturing, and can be useful for medium to large-sized batteries.
    Type: Application
    Filed: December 27, 2023
    Publication date: July 4, 2024
    Applicant: Youlchon Chemical Co., Ltd.
    Inventors: Nok Jung Song, Hee Sik Han, Jee Eun Jang, Huihun Kim
  • Publication number: 20240222755
    Abstract: Disclosed is a secondary battery pouch film including a layered structure wherein at least an outer layer, a barrier layer, and a sealant layer are structured in that order, wherein the sealant layer includes an extrusion (EC) layer and a polypropylene (PP) layer below the extrusion (EC) layer, wherein a thickness ratio of the polypropylene (PP) layer to the sealant layer is more than 0.5, wherein an upper yield strength (N/mm2) in an MD direction of the sealant layer is 17.50 to 19.99, and an upper yield strength (N/mm2) in a TD direction thereof is 17.00 to 19.99, wherein a glass transition temperature (Tg) of the sealant layer is ?20° C. to ?10° C. The pouch film not only has excellent sealing strength at ambient temperature and high temperature, but also has excellent sealing strength maintenance at ambient temperature and especially at high temperature.
    Type: Application
    Filed: December 2, 2023
    Publication date: July 4, 2024
    Applicant: Youlchon Chemical Co., Ltd.
    Inventors: Nok Jung Song, Hee Sik Han, Jee Eun Jang, Yoohan Kim, Doohee Lee
  • Publication number: 20240222756
    Abstract: Disclosed is a cell pouch film, comprising at least an outer layer, a barrier layer, and a sealant layer structured in that order, wherein the sealant layer is formed by extrusion on the barrier layer, wherein the sealant layer has a glass transition temperature (Tg) of ?10° C. to ?7° C., and wherein a crystallinity of the sealant layer is 28% to 32%, a preparation method thereof, a secondary battery using the cell pouch film, and a manufacturing method for the secondary battery. The sealing strength of the pouch film may be maintained or increased at high temperatures, thereby providing excellent high-temperature stability, which prevents electrolyte leakage during battery use in high-temperature environments and ensures battery safety with fewer defects.
    Type: Application
    Filed: December 28, 2023
    Publication date: July 4, 2024
    Applicant: Youlchon Chemical Co., Ltd.
    Inventors: Nok Jung Song, Hee Sik Han, Jee Eun Jang, Doohee Lee, Geon Ryong Kim, Yoohan Kim
  • Publication number: 20240213589
    Abstract: Disclosed is a cell pouch film and a method for preparing the same, secondary battery using the same, and a method for manufacturing the secondary battery, wherein the cell pouch film includes at least an outer layer, a barrier layer, and a sealant layer which is an inner layer, the outer layer comprises a PET film of 7 to 12 ?m on an outer side and a nylon film of 20 to 30 ?m in an inner side, the barrier layer has a thickness of 60 to 80 ?m, and the inner layer has a thickness of 60 to 100 ?m. The cell pouch film is excellent in insulation resistance properties while having high rigidity and high formability, and this is useful as a medium and large size, particularly next-generation cell pouch for electric vehicles.
    Type: Application
    Filed: December 21, 2023
    Publication date: June 27, 2024
    Applicant: Youlchon Chemical Co., Ltd.
    Inventors: Nok Jung Song, Hee Sik Han, Jee Eun Jang