CN-122000566-A - Cover assembly and battery cell comprising same

Abstract

The present disclosure relates to a cap assembly coupled to a case accommodating an electrode assembly and covering one side of an opening of the case, the cap assembly including a cap plate including a first hole, a terminal part having a cylindrical shape including an insertion hole to be connected with the electrode assembly and inserted into the first hole, a first insulating member having a sheet shape and disposed to face the cap plate, and a heat insulating member disposed between the first insulating member and the terminal part.

Inventors

• ZHENG HUIMIN
• Zhu Shengxun
• Pu Chengcai

Assignees

• SK新能源株式会社

Dates

Publication Date

20260508

Application Date

20251105

Priority Date

20241105

Claims (15)

1. 1. A cap assembly coupled to a case accommodating an electrode assembly and covering one side of an opening of the case, the cap assembly comprising: A cover plate including a first hole; A terminal part having a cylindrical shape, including an insertion hole to be connected with the electrode assembly, and inserted into the first hole; A first insulating member in a sheet shape and disposed to face the cover plate, and And a heat insulating member provided between the first insulating member and the terminal portion.
2. 2. The cap assembly of claim 1, further comprising: and the terminal plate is arranged on the cover plate.
3. 3. The cap assembly of claim 2, further comprising: And a second insulating member disposed between the cap plate and the terminal plate.
4. 4. The cap assembly of claim 1, further comprising: and a gasket disposed between the terminal portion and the cap plate.
5. 5. The cap assembly of claim 1, wherein, The insulating member is plate-shaped and includes an annular second hole.
6. 6. The cap assembly of claim 5, wherein, The diameter of the second hole is larger than the diameter of the insertion hole.
7. 7. The cap assembly of claim 1, wherein, The heat insulating member is formed of any one of polyimide, polypropylene, polyphenylene sulfide, and crystalline polyethylene terephthalate, or a combination thereof.
8. 8. The cap assembly of claim 1, further comprising: and a support plate coupled to an outer circumferential surface of the terminal portion.
9. 9. A battery cell, comprising: An electrode assembly; A case accommodating the electrode assembly in an accommodating space formed inside, and A cover assembly coupled to the housing and covering one side of the opening of the housing, The cap assembly includes: A cover plate including a first hole; A terminal part having a cylindrical shape, including an insertion hole to be connected with the electrode assembly, and inserted into the first hole; A first insulating member in a sheet shape and disposed to face the cover plate, and And a heat insulating member provided between the first insulating member and the terminal portion.
10. 10. The cell of claim 9, further comprising: and a collector plate facing the cap plate and electrically connected to the electrode assembly.
11. 11. The cell of claim 10, wherein, The collector plate includes a connection pin, The insertion hole is welded to the connection pin.
12. 12. The cell of claim 10, wherein, The cap assembly further includes: and a support plate provided between the heat insulating member and the collector plate.
13. 13. The cell of claim 12, wherein, The heat insulating member is disposed between the first insulating member and the support plate, The first insulating member is disposed between the cover plate and the heat insulating member.
14. 14. The cell of claim 9, wherein, The cap assembly further includes: and the terminal plate is arranged on the cover plate.
15. 15. The cell of claim 14, wherein, The cap assembly further includes: And a second insulating member disposed between the cap plate and the terminal plate.

Description

Cover assembly and battery cell comprising same Technical Field The present disclosure relates to a cap assembly and a battery cell including the same. Background Unlike a primary battery, a secondary battery has convenience in that it can be charged and discharged, and thus has been attracting attention as a power source for various digital devices, electric vehicles, and the like. Unlike the primary battery, the secondary battery is capable of being charged and discharged, and thus can be applied to various fields of digital cameras, mobile phones, notebook computers, hybrid electric vehicles, energy storage systems (Energy storage system, ESS), and the like. Such a secondary Battery may include a Battery Cell (Battery Cell) that accommodates an electrode assembly formed by stacking or winding a positive electrode plate, a negative electrode plate, and a separator (Seperator) in a Roll (Roll) form inside a case. On the other hand, the cells may be manufactured by Welding (Welding) or the like, in which case Welding heat may be transferred to the parts that are not heat-resistant, causing the parts to melt. In addition, in the state of use of the battery cell or in the state of thermal runaway, heat may be propagated to the component to melt it. Therefore, it is necessary to study a technique of preventing heat from being transmitted from a heat source to an adjacent component. Generally, the battery cell has a structure in which the electrode assembly is received in the case, and may include a cap assembly covering the case. The cap assembly may be coupled to the case, and may be electrically connected with the electrode assembly. The electrode terminals electrically connected to the external arrangement may be formed to protrude outward on the cap assembly. On the other hand, the cap assembly includes an electrically insulating member, but since the insulating member is not heat-resistant, there is a risk of damage due to heat. Accordingly, a solution for protecting an insulating member from heat is required. Disclosure of Invention First, the technical problem to be solved According to one aspect of the present disclosure, a technical problem to be solved is to improve stability of an electrode assembly and/or a battery cell. According to another aspect of the present disclosure, a technical problem to be solved is to improve heat resistance of an electrode assembly and/or a battery cell. According to another aspect of the present disclosure, a technical problem to be solved is to reduce manufacturing costs of an electrode assembly and/or a battery cell. According to another aspect of the present disclosure, a technical problem to be solved is to minimize or prevent heat from propagating from a heat source to adjacent components. According to another aspect of the present disclosure, a technical problem to be solved is to minimize or prevent melting of an insulating plate disposed at the back of a cap plate. On the other hand, the cap assembly and the battery core including the cap assembly according to the present disclosure may be widely applied to Green Technology (Green Technology) fields such as electric vehicles (ELECTRIC VEHICLE), battery charging stations (Battery Charging Station), energy storage systems (Energy Storage System, ESS), and other solar Power generation (Photovoltaics) and Wind Power generation (Wind Power) using the battery core. In addition, the cap assembly according to the present disclosure and the battery cell including the same may be used for environmental protection (eco-friendly) vehicles (Mobility) including electric vehicles and Hybrid (Hybrid) vehicles, etc., which prevent climate change by suppressing atmospheric pollution and greenhouse gas emission. (II) technical scheme According to the cap assembly of the present disclosure, the cap assembly is coupled to a case accommodating an electrode assembly and covering one side of an opening of the case, and may include a cap plate including a first hole, a terminal part having a cylindrical shape including an insertion hole to be connected with the electrode assembly and inserted into the first hole, a first insulating member having a sheet shape and disposed to face the cap plate, and a heat insulating member disposed between the first insulating member and the terminal part. The cap assembly according to the present disclosure may further include a terminal plate disposed on the cap plate. The cap assembly according to the present disclosure may further include a second insulating member disposed between the cap plate and the terminal plate. The cap assembly according to the present disclosure may further include a gasket disposed between the terminal portion and the cap plate. In one embodiment, the insulating member may be plate-shaped and include an annular second hole. In one embodiment, the diameter of the second hole may be larger than the diameter of the insertion hole. In one embodiment, the heat insulating memb