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EP-4742401-A1 - SECONDARY BATTERY

EP4742401A1EP 4742401 A1EP4742401 A1EP 4742401A1EP-4742401-A1

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. The vent part comprises an elastic member coupled with the insulating frame and a gasket coupled with the elastic member.

Inventors

  • YOO, Sanghoon

Assignees

  • Samsung SDI Co., Ltd.

Dates

Publication Date
20260513
Application Date
20251105

Claims (13)

  1. A secondary battery, comprising: an electrode assembly (10); a case (110) accommodating the electrode assembly (10), the case (110) having an open side; a cap plate (120) coupled with the open side, the cap plate (120) having a vent hole (122); an insulating frame (610) coupled with the cap plate (120), the insulating frame (610) being between the cap plate (120) and the electrode assembly (10); and a vent part (140) coupled with the insulating frame (610), the vent part (140) sealing the vent hole (122), wherein the vent part (140) comprises: an elastic member (620) coupled with the insulating frame (610); and a gasket (630) coupled with the elastic member (620).
  2. The secondary battery as claimed in claim 1, wherein the vent part (140) further comprises a plug (640) disposed on the gasket (630).
  3. The secondary battery as claimed in claim 1 or 2, wherein the elastic member (620) is a spring coil.
  4. The secondary battery as claimed in any one of the preceding claims, wherein the elastic member (620) is coupled to the insulating frame (610) by welding.
  5. The secondary battery as claimed in claim 2, wherein the gasket (630) comprises: a first surface in contact with the plug (640); and a second surface in contact with the elastic member (620), wherein an area of the first surface is larger than an area of the second surface.
  6. The secondary battery as claimed in any one of the preceding claims, wherein the elastic member (620) and/or the plug (640) are formed of a corrosion-resistant material.
  7. The secondary battery as claimed in claim 6, wherein the corrosion-resistant material is at least one of aluminum, an aluminum alloy, and stainless steel.
  8. The secondary battery as claimed in any one of the preceding claims, wherein the gasket (630) is formed of an elastomer.
  9. The secondary battery as claimed in claim 8, wherein the elastomer is a silicon rubber.
  10. The secondary battery as claimed in any one of the preceding claims, wherein the vent hole (122) has a circular shape.
  11. The secondary battery as claimed in any one of the preceding claims, wherein the vent part (140) includes: a protrusion portion (920) protruding on the gasket (910); and a plug (640) disposed on the protrusion portion (920).
  12. The secondary battery as claimed in claim 11, wherein the gasket (910) and the protrusion portion (920) are integrally formed with each other.
  13. The secondary battery as claimed in claim 11 or 12, wherein an area of the plug (640) is larger than an area of the gasket (910).

Description

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. SUMMARY The invention is defined by the appended claims. The description that follows is subjected to this limitation. Any disclosure lying outside the scope of said claims is only intended for illustrative as well as comparative purposes. 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 (directly) coupled with the insulating frame, the vent part sealing the vent hole. The vent part includes an elastic member coupled with the insulating frame and a gasket (directly) coupled with the elastic member, The vent part may further include a plug disposed (directly) on the gasket. The elastic member may be a spring coil. The elastic member may be (directly) 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/or the plug may each include or be formed of a corrosion-resistant material. The corrosion-resistant material may be at least one of aluminum, an aluminum alloy, and stainless use steel. The gasket may include a material having an elastic force. The gasket may be formed of an elastomer. The material having the elastic force, respectively the elastomer may be a 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 (directly) coupled with the open side of the case, the cap plate including a vent hole, an insulating frame (directly) 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 (directly)coupled with the insulating frame, a gasket (directly)coupled with the elastic member, a protrusion portion protruding on the gasket, and a plug disposed (directly) on the protrusion portion. The elastic member may be welding coupled with the insulating frame. The gasket and the protrusion portion may be integrally formed with each other. 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. BRIEF DESCRIPTION OF THE DRAWINGS The following drawings attached to this specification illustrate embodiments of the present disclosure, and further describe aspects and features of the present disclosure together with the detailed description of the present disclosure. Thus, the present disclosure should not be construed as being limited to the drawings. Features will become apparent to those of skill in the art by describing in detail exemplary embodiments with reference to the attached drawings, in which: FIG. 1 illustrates an exploded perspective view illustrating a secondary battery according to some embodiments of the present disclosure;FIG. 2 illustrates a perspective view illustrating the secondary battery according to some embodiments of the present disclosure;FIG. 3 illustrates a perspective view illustrating the cap plate in which a vent part is disposed according to some embodiments of the present disclosure;FIG. 4 illustrates a perspective view illustr