US-20260128454-A1 - SECONDARY BATTERY

Abstract

A secondary battery includes an electrode assembly, a case accommodating the electrode assembly, the case having one open side, a cap plate coupled with the one open side, the cap plate having a vent hole, an insulating frame coupled with the cap plate, the insulating frame being between the cap plate and the electrode assembly, and a vent part coupled with the insulating frame, the vent part sealing the vent hole.

Inventors

• Sanghoon Yoo

Assignees

• SAMSUNG SDI CO., LTD.

Dates

Publication Date

20260507

Application Date

20250701

Priority Date

20241107

Claims (20)

1. 1 . A secondary battery, comprising: an electrode assembly; a case accommodating the electrode assembly, the case having an open side; a cap plate coupled with the open side, the cap plate having a vent hole; an insulating frame coupled with the cap plate, the insulating frame being between the cap plate and the electrode assembly; and a vent part coupled with the insulating frame, the vent part sealing the vent hole.
2. 2 . The secondary battery as claimed in claim 1 , wherein the vent part comprises: an elastic member coupled with the insulating frame; a gasket coupled with the elastic member; and a plug on the gasket.
3. 3 . The secondary battery as claimed in claim 2 , wherein an elastic coefficient of the elastic member is based on a size of the case.
4. 4 . The secondary battery as claimed in claim 2 , wherein the elastic member is coupled to the insulating frame by welding.
5. 5 . The secondary battery as claimed in claim 2 , wherein the gasket comprises: a first surface in contact with the plug; and a second surface in contact with the elastic member, wherein an area of the first surface is larger than an area of the second surface.
6. 6 . The secondary battery as claimed in claim 2 , wherein the elastic member and the plug each include a corrosion-resistant material.
7. 7 . The secondary battery as claimed in claim 6 , wherein the corrosion-resistant material comprises at least one of aluminum, an aluminum alloy, and stainless use steel.
8. 8 . The secondary battery as claimed in claim 2 , wherein the gasket includes a material having an elastic force.
9. 9 . The secondary battery as claimed in claim 8 , wherein the material having the elastic force comprises at least one of silicon and silicon rubber.
10. 10 . The secondary battery as claimed in claim 1 , wherein the vent hole has a circular shape.
11. 11 . A secondary battery, comprising; an electrode assembly; a case accommodating the electrode assembly, the case having an open side; a cap plate coupled with the open side of the case, the cap plate including a vent hole; an insulating frame coupled with the cap plate, the insulating frame being between the cap plate and the electrode assembly; and a vent part sealing the vent hole, wherein the vent part includes: an elastic member coupled with the insulating frame; a gasket coupled with the elastic member; a protrusion portion protruding on the gasket; and a plug on the protrusion portion.
12. 12 . The secondary battery as claimed in claim 11 , wherein an elastic coefficient of the elastic member is based on a size of the case.
13. 13 . The secondary battery as claimed in claim 11 , wherein the elastic member is welding coupled with the insulating frame.
14. 14 . The secondary battery as claimed in claim 11 , wherein the gasket and the protrusion portion are integral with each other.
15. 15 . The secondary battery as claimed in claim 11 , wherein the elastic member and the plug each include a corrosion-resistant material.
16. 16 . The secondary battery as claimed in claim 15 , wherein the corrosion-resistant material comprises at least one of aluminum, an aluminum alloy, and stainless use steel.
17. 17 . The secondary battery as claimed in claim 11 , wherein the gasket includes a material having an elastic force.
18. 18 . The secondary battery as claimed in claim 17 , wherein the material having an elastic force includes at least one of silicon and silicon rubber.
19. 19 . The secondary battery as claimed in claim 11 , wherein the vent hole has a circular shape.
20. 20 . The secondary battery as claimed in claim 11 , wherein an area of the plug is larger than an area of the gasket.

Description

CROSS-REFERENCE TO RELATED APPLICATION This application claims priority under 35 U.S.C § 119 to Korean Patent Application No. 10-2024-0156931, filed in the Korean Intellectual Property Office on Nov. 7, 2024, the entire contents of which are hereby incorporated by reference. BACKGROUND 1. Field The present disclosure relates to a secondary battery. 2. Description of the 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. A lithium-ion secondary battery as a type of a secondary battery has been widely used. When the lithium-ion secondary battery is exposed to a high temperature environment for a long time or is continuously charged or discharged with high current, internal gas may be generated due to deterioration of a cell and the like. When internal pressure of a case is increased due to the internal gas, fire or explosion may occur. 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 Embodiments include a secondary battery, including an electrode assembly, a case accommodating the electrode assembly, the case having an open side, a cap plate coupled with the open side, the cap plate having a vent hole, an insulating frame coupled with the cap plate, the insulating frame being between the cap plate and the electrode assembly, and a vent part coupled with the insulating frame, the vent part sealing the vent hole. The vent part may include an elastic member coupled with the insulating frame, a gasket coupled with the elastic member, and a plug on the gasket. An elastic coefficient of the elastic member may be based on a size of the case. The elastic member may be coupled to the insulating frame by welding. The gasket may include a first surface in contact with the plug, and a second surface in contact with the elastic member, wherein an area of the first surface may be larger than an area of the second surface. The elastic member and the plug may each include a corrosion-resistant material. The corrosion-resistant material may include at least one of aluminum, an aluminum alloy, and stainless use steel. The gasket may include a material having an elastic force. The material having the elastic force may include at least one of silicon and silicon rubber. The vent hole may have a circular shape. Embodiments include a secondary battery, including an electrode assembly, a case accommodating the electrode assembly, the case having an open side, a cap plate coupled with the open side of the case, the cap plate including a vent hole, an insulating frame coupled with the cap plate, the insulating frame being between the cap plate and the electrode assembly, and a vent part sealing the vent hole, wherein the vent part includes an elastic member coupled with the insulating frame, a gasket coupled with the elastic member, a protrusion portion protruding on the gasket, and a plug on the protrusion portion. An elastic coefficient of the elastic member may be based on a size of the case. The elastic member may be welding coupled with the insulating frame. The gasket and the protrusion portion may be integral with each other. The elastic member and the plug may each include a corrosion-resistant material. The corrosion-resistant material may include at least one of aluminum, an aluminum alloy, and stainless use steel. The gasket may include a material having an elastic force. The material having an elastic force may include at least one of silicon and silicon rubber. The vent hole may have a circular shape. An area of the plug may be larger than an area of the gasket. 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. However, aspects and features of the present disclosure are not limited to those described above, and other aspects and features not mentioned will be clearly understood by a person skilled in the art from the detailed description, described below. BRIEF DESCRIPTION OF THE DRAWINGS The following drawings attached to this specification illustrate embodiments of the present disclosure, and further de