CN-122025944-A - Cap assembly and secondary battery including the same

Abstract

The present disclosure relates to a cap assembly and a secondary battery including the cap assembly. The 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 the other surface of the cap plate, a portion of the insulator surrounding 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.

Inventors

• SONG YONGZHEN
• Pei Guangshou
• LONG JUNSHAN
• LI JUNHENG
• JIN ZHIHUAN
• Lu Hengche
• Qing Shiren

Assignees

• 三星SDI株式会社

Dates

Publication Date

20260512

Application Date

20251017

Priority Date

20241111

Claims (20)

1. 1. A cap assembly, comprising: a cover plate having a support hole formed therein; an electrode terminal provided on one surface of the cap plate, and An insulator disposed on the other surface of the cap plate, a portion of the insulator surrounding a perimeter of the support hole of the cap plate, and configured to be coupled to and electrically insulate the electrode terminal from the cap plate.
2. 2. The cap assembly according to claim 1, wherein the insulator is integrally formed with the cap plate and the electrode terminal by insert injection molding.
3. 3. The cap assembly of claim 1, wherein the insulator comprises: A base portion provided on the other surface of the cover plate, and An electrode terminal coupling portion protruding from the base portion and exceeding the one surface of the cap plate while surrounding the perimeter of the support hole of the cap plate, and the electrode terminal being coupled to the electrode terminal coupling portion.
4. 4. A cap assembly according to claim 3, wherein the base portion comprises: A base plate spaced apart from the cover plate by a predetermined distance and disposed in parallel with the cover plate, and And a support portion extending from both side surfaces of the base plate in a vertical direction and closely contacting the cover plate.
5. 5. The lid assembly of claim 4, wherein the base portion further comprises: a coupling groove portion recessed in the base plate from a surface opposite to a surface of the base plate on which the electrode terminal coupling portion is formed toward the electrode terminal coupling portion.
6. 6. The cap assembly according to claim 3, wherein the electrode terminal coupling part comprises: A receiving groove into which the electrode terminal is inserted and which surrounds the circumference of the electrode terminal, and An insertion hole is formed to penetrate the receiving groove.
7. 7. The cap assembly according to claim 3, wherein at least a portion of the cap plate is formed to be disposed between the base portion of the insulator and the electrode terminal coupling portion.
8. 8. The cap assembly of claim 3, wherein the cap plate further comprises: An insertion groove formed to allow at least a portion of the electrode terminal coupling portion to be inserted into the insertion groove.
9. 9. The lid assembly of claim 8, wherein the cover plate further comprises: at least one communication hole into which a portion of the insulator is inserted to connect the base portion with the electrode terminal coupling portion.
10. 10. The cap assembly according to claim 9, wherein the support hole and the at least one communication hole are formed in the insertion groove.
11. 11. The lid assembly of claim 9, wherein the cover plate further comprises: A fastening slit formed along a perimeter of at least one of the support hole and the at least one communication hole, and into which a portion of the insulator is embedded.
12. 12. The cap assembly of claim 1, further comprising: And a link plate disposed between the electrode terminal and the insulator and electrically connected to the electrode terminal.
13. 13. The cap assembly of claim 12, wherein the coupling plate comprises: And the connecting hole is communicated with the supporting hole of the cover plate.
14. 14. The cap assembly according to claim 12, wherein the electrode terminal comprises: a through hole formed to allow at least a portion of the link plate to be exposed to the outside.
15. 15. The cap assembly according to claim 12, wherein the electrode terminal comprises: and a coupling groove recessed in a shape corresponding to the coupling plate, and the coupling plate is inserted into the coupling groove.
16. 16. A secondary battery, comprising: An electrode assembly including a first electrode tab formed on one surface and a second electrode tab formed on the other surface; a case having at least one open side surface and accommodating the electrode assembly; A sub-board disposed on the open side surface of the case, coupled with at least one of the first and second electrode tabs, and including a boss portion protruding outward, and A cap assembly coupled to the open side surface of the housing, Wherein, the lid assembly includes: a cover plate having a support hole formed therein; An electrode terminal disposed on one surface of the cap plate and electrically connected to the sub-board, and An insulator disposed on the other surface of the cap plate, a portion of the insulator surrounding a perimeter of the support hole of the cap plate and connected to the electrode terminal, and configured to electrically insulate the electrode terminal from the cap plate and the cap plate from the electrode assembly.
17. 17. The secondary battery according to claim 16, wherein the insulator comprises: A base portion provided on the other surface of the cover plate, and An electrode terminal coupling portion protruding from the base portion and exceeding the one surface of the cap plate while surrounding the perimeter of the support hole of the cap plate, and the electrode terminal being coupled to the electrode terminal coupling portion.
18. 18. The secondary battery according to claim 17, wherein the base portion includes: a base plate configured to be disposed to face the cover plate at a predetermined distance from the cover plate; A support portion extending from both side surfaces of the base plate in a vertical direction and closely contacting the cover plate, and A coupling groove portion recessed in the base plate from a surface opposite to a surface of the base plate on which the electrode terminal coupling portion is formed toward the electrode terminal coupling portion, and the sub-board is embedded in the coupling portion.
19. 19. The secondary battery according to claim 17, wherein the electrode terminal coupling portion comprises: A receiving groove into which the electrode terminal is inserted and which surrounds the circumference of the electrode terminal, and An insertion hole formed to penetrate the receiving groove, and into which the boss portion of the sub-board is inserted.
20. 20. The secondary battery according to claim 16, wherein the cap assembly further comprises: And a coupling plate disposed between the electrode terminal and the insulator, one side of the coupling plate being electrically connected to the electrode terminal, and the other side of the coupling plate being coupled to the boss portion of the sub-plate.

Description

Cap assembly and secondary battery including the same Technical Field The present disclosure relates to a cap assembly and a secondary battery including the same. Background Unlike primary batteries that are not designed to be (re) charged, secondary (or rechargeable) batteries are batteries that are designed to be discharged and re-charged. Low-capacity secondary batteries are used in portable small-sized electronic devices such as smart phones, function phones, notebook computers, digital cameras, and camcorders, while high-capacity secondary batteries are widely used as power sources for driving motors in hybrid vehicles and electric vehicles and for storing electric power (e.g., home and/or utility-scale electric power storage). A secondary battery generally includes an electrode assembly including a positive electrode and a negative electrode, a case accommodating the electrode assembly, and an electrode terminal connected to the electrode assembly. Recently, research is actively being conducted to improve the rapid charge and capacity of the secondary battery. In the case of a secondary battery in which the case and the cap assembly are assembled after the electrode assembly is received 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 the battery capacity. The above information disclosed in this background section is for enhancement of understanding of the background of the disclosure and, therefore, it may contain information that does not form a related (or prior) art. Disclosure of Invention The present disclosure provides a cap assembly to solve the above-described problems, and a secondary battery including the cap assembly. These and other aspects and features of the present disclosure will be described in, or will be apparent from, the following description of the 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 the other surface of the cap plate, a portion of the insulator surrounding a perimeter of the support hole of the cap plate and configured to be coupled to and electrically insulate the electrode terminal from the cap plate. In some embodiments, the insulator may be integrally formed with the cap plate and 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 an electrode terminal coupling portion protruding from the base portion and beyond one surface of the cap plate while surrounding a perimeter of the support hole of the cap plate, and the electrode terminal may be coupled to the electrode terminal coupling portion. In some embodiments, the base portion may include a base plate spaced apart from the cover plate by a predetermined distance and disposed in parallel with the cover plate, and a support portion extending from both side surfaces of the base plate in a vertical direction and in close contact with the cover plate. In some embodiments, the base portion may further include a coupling groove portion, which may be recessed in the base plate from a surface opposite to a surface of the base plate where the electrode terminal coupling portion is formed toward the electrode terminal coupling portion. In some embodiments, the electrode terminal coupling part may include a receiving groove into which the electrode terminal may be inserted and which surrounds a circumference of the electrode terminal, and an insertion hole formed to penetrate the receiving groove. In some embodiments, at least a portion of the cap plate may be formed to be disposed between the base portion of the insulator and the electrode terminal coupling portion. In some embodiments, the cap plate may further include an insertion groove formed to allow at least a portion of the electrode terminal coupling portion to be inserted into the insertion groove. In some embodiments, the cap plate may further include at least one communication hole, and a portion of the insulator may be inserted into the at least one communication hole to connect the base portion with the electrode terminal coupling portion. In some embodiments, the support hole and the at least one communication hole may be formed in the insertion groove. In some embodiments, the cover plate may further include a fastening slit formed along a circumference of at least one of the support hole and the at least one communication hole, and a portion of the insulator may be inserted into the fastening slit. In some embodiments, the cap assembly may further include a coupling plate disposed between the electrode terminal and the insulator and electrically connected to the electrode terminal. In some embodiments, the