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EP-4742386-A1 - CAP ASSEMBLY AND SECONDARY BATTERY INCLUDING THE SAME

EP4742386A1EP 4742386 A1EP4742386 A1EP 4742386A1EP-4742386-A1

Abstract

The present disclosure relates to a cap assembly (100) and a secondary battery (10) including the same. The cap assembly (100) may include a cap plate (110) having a support hole (112) formed therein, an electrode terminal (120) disposed on one surface of the cap plate (110), and an insulator (140) disposed on an other surface of the cap plate (110), a part of which surrounds a perimeter of the support hole (112) of the cap plate (110), and configured to be coupled to the electrode terminal (120) and electrically insulate the electrode terminal (120) from the cap plate (110).

Inventors

  • SONG, YOUNGJIN
  • BAE, KWANGSOO
  • YONG, Jun-Sun
  • Lee, Junhyung
  • KIM, JIHWAN
  • Roh, Heyoungcheoul
  • KYUNG, Sein

Assignees

  • SAMSUNG SDI CO., LTD.

Dates

Publication Date
20260513
Application Date
20251014

Claims (15)

  1. A cap assembly (100) comprising: a cap plate (110) having a support hole (112) formed therein; an electrode terminal (120) disposed on one surface of the cap plate (110); and an insulator (140) disposed on another surface of the cap plate (110), a part of which surrounds a perimeter of the support hole (112) of the cap plate (110), and configured to couple to the electrode terminal (120) and electrically insulate the electrode terminal (120) from the cap plate (110).
  2. The cap assembly (100) as claimed in claim 1, wherein the insulator (140) is formed integrally with the cap plate (110) and/or the electrode terminal (120) by insert injection molding.
  3. The cap assembly (100) as claimed in claim 1 or 2, wherein the insulator (140) comprises: a base portion (150) disposed on the other surface of the cap plate (110); and an electrode terminal coupling portion (160) protruding from the base portion (150) and disposed on the one surface of the cap plate (110) while surrounding the perimeter of the support hole (112) of the cap plate (110), and to which the electrode terminal (120) is coupled.
  4. The cap assembly (100) as claimed in claim 3, wherein the base portion (150) comprises: a base plate (151) spaced apart from the cap plate (110) by a predetermined distance and disposed parallel to the cap plate (110); and a support portion (152) extending in a vertical direction on opposite surfaces of the base plate (151) and in contact with the cap plate (110).
  5. The cap assembly (100) as claimed in claim 3 or 4, wherein the base portion (150) comprises: a coupling portion (153) recessed toward the electrode terminal coupling portion (160) on an opposite surface of a surface where the electrode terminal coupling portion (160) is formed on the base plate (151).
  6. The cap assembly (100) as claimed in any one of claims 3 to 5, wherein the electrode terminal coupling portion (160) comprises: a receiving groove (161) into which the electrode terminal (120) is inserted and which surrounds a circumference of the electrode terminal (120); and an insertion hole (162) formed to penetrate the receiving groove (161).
  7. The cap assembly (100) as claimed in any one of claims 3 to 6, wherein at least a part of the cap plate (110) is formed to be disposed between the base portion (150) and the electrode terminal coupling portion (160) in the insulator (140).
  8. The cap assembly (100) as claimed in any one of claims 3 to 7, wherein the cap plate (110) comprises: an insertion groove (111) formed to allow at least a part of the electrode terminal coupling portion (160) to be inserted thereto.
  9. The cap assembly (100) as claimed in any one of claims 3 to 8, wherein the cap plate (110) comprises: at least one communication hole (113) into which a part of the insulator (140) is inserted to connect the base portion (150) with the electrode terminal coupling portion (160).
  10. The cap assembly (100) as claimed in claim 9, wherein the support hole (112) and the communication hole (113) are formed at the insertion groove (111).
  11. The cap assembly (100) as claimed in claim 9 or 10, wherein the cap plate (110) further comprises: a fastening slit (114) formed along a circumference of at least one of the support hole (112) or the communication hole (113), and into which a part of the insulator (140) is inserted.
  12. The cap assembly (100) as claimed in any one of the preceding claims, further comprising: a coupling plate (130) disposed between the electrode terminal (120) and the insulator (140), and electrically connected to the electrode terminal (120).
  13. The cap assembly (100) as claimed in claim 12, wherein the electrode terminal (120) comprises: a through hole (121) formed to allow at least a part of the coupling plate (130) to be exposed to an outside.
  14. The cap assembly (100) as claimed in claim 12 or 13, wherein the electrode terminal (120) comprises: a coupling groove (122) that is recessed into a shape corresponding to the coupling plate (130), and into which the coupling plate (130) is inserted.
  15. A secondary battery (10) comprising: an electrode assembly (300) comprising a first electrode tab (310) formed on one surface and a second electrode tab (320) formed on another surface; a case (200) having at least one open side surface and accommodate the electrode assembly (300); a sub-plate (400) configured to be disposed on the open side surface of the case (200), be coupled with at least one of the first electrode tab (310) or the second electrode tab (320), and comprising a boss portion (420) protruding outwardly; and a cap assembly (100) coupled to the open side surface of the case (200), wherein the cap assembly (100) is a cap assembly (100) as claimed in any one of claims 1 to 14.

Description

BACKGROUND 1. Field The present disclosure relates to a cap assembly and a secondary battery including the same. 2. Description of Related Art Unlike primary batteries that are not designed to be (re)charged, secondary (or rechargeable) batteries are batteries that are designed to be discharged and recharged. Low-capacity secondary batteries are used in portable, small electronic devices, such as smart phones, feature phones, notebook computers, digital cameras, and camcorders, while large-capacity secondary batteries are widely used as power sources for driving motors in hybrid vehicles and electric vehicles and for storing power (e.g., home and/or utility scale power storage). A secondary battery generally includes an electrode assembly composed of a positive electrode and a negative electrode, a case accommodating the same, and electrode terminals connected to the electrode assembly. Recently, research is being actively conducted to improve rapid charging and capacity of secondary batteries. In the case of a secondary battery in which a case and a cap assembly are assembled after the electrode assembly is housed in the case, there is a problem in that the space inside the case is reduced due to the thickness of the cap assembly, which is disadvantageous in terms of increasing battery capacity. 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 constitute related (or prior) art. SUMMARY The present disclosure provides a cap assembly and a secondary battery including the same to solve the above problems. These and other aspects and features of the present disclosure will be described in or will be apparent from the following description of embodiments of the present disclosure. According to one or more embodiments of the present disclosure, a cap assembly may include a cap plate having a support hole formed therein, an electrode terminal disposed on one surface of the cap plate, and an insulator disposed on an other surface of the cap plate, a part of which surrounds a perimeter of the support hole of the cap plate, and configured to be coupled to the electrode terminal and electrically insulate the electrode terminal from the cap plate. In some embodiments, the insulator may be formed integrally with the cap plate and/or the electrode terminal by insert injection molding. In some embodiments, the insulator may include a base portion disposed on the other surface of the cap plate, and may include an electrode terminal coupling portion protruding from the base portion and disposed on one (e.g., the one) surface of the cap plate while surrounding the perimeter of the support hole of the cap plate, and to which the electrode terminal may be coupled. In some embodiments, the base portion may include a base plate spaced apart from the cap plate by a distance (e.g., a predetermined distance) and disposed parallel to the cap plate, and may include a support portion extending in a vertical direction on both (e.g., opposite) surfaces of the base plate and in contact (e.g., close contact) with the cap plate. In some embodiments, the base portion may further include a coupling portion sunken (e.g., recessed) toward the electrode terminal coupling portion on an opposite surface of a surface where the electrode terminal coupling portion may be formed on the base plate. In some embodiments, the electrode terminal coupling portion may include a receiving groove into which the electrode terminal may be inserted and which may surround a circumference of the electrode terminal, and may include an insertion hole formed to penetrate the receiving groove. In some embodiments, at least a part of the cap plate may be formed to be disposed between the base portion and the electrode terminal coupling portion in the insulator. In some embodiments, the cap plate may further include an insertion groove formed to allow at least a part of the electrode terminal coupling portion to be inserted thereto. In some embodiments, the cap plate may further include at least one communication hole into which a part of the insulator may be inserted to connect the base portion with the electrode terminal coupling portion. In some embodiments, the support hole and/or the communication hole may be formed at the insertion groove. In some embodiments, the cap plate may further include a fastening slit formed along a circumference of at least one of the support hole or the communication hole, and into which a part of the insulator may be inserted. In some embodiments, the cap assembly may further include a coupling plate disposed between the electrode terminal and the insulator, and that may be electrically connected to the electrode terminal. In some embodiments, the coupling plate may further include a coupling hole communicating with the support hole of the cap plate. In some embodiments, the electrode termi