Cylindrical secondary battery including top cap
The top cap design with a temperature-sensitive third conduction portion effectively interrupts overcurrent in cylindrical secondary batteries, ensuring safety and stability by melting to release electrical contact.
JP2025530544A5Pending Publication Date: 2026-05-22LG ENERGY SOLUTION LTD
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Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- LG ENERGY SOLUTION LTD
- Filing Date
- 2023-10-05
- Publication Date
- 2026-05-22
AI Technical Summary
Technical Problem
Existing cylindrical secondary batteries face challenges in effectively interrupting overcurrent to ensure stability and safety.
Method used
A top cap design with a first and second conduction portion and a third conduction portion that melts at a predetermined temperature to interrupt electrical contact, utilizing a gasket portion to form a penetrating region and release contact when the temperature exceeds the threshold.
Benefits of technology
The design allows for simple and effective overcurrent blocking, maintaining structural stability while preventing damage to the battery.
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Smart Images
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Abstract
A cylindrical secondary battery according to an embodiment of the present invention includes a cylindrical can configured to accommodate an electrode assembly, and a top cap configured to cover an open top of the cylindrical can. The top cap includes a first conductive portion, a second conductive portion disposed below the first conductive portion and electrically connected to the electrode assembly, and a middle layer including a third conductive portion disposed between the first conductive portion and the second conductive portion, contacting the first conductive portion and the second conductive portion and melting at a predetermined temperature or higher to release the contact between the first conductive portion and the second conductive portion. The middle layer may include a gasket portion disposed between the first conductive portion and the second conductive portion, and forming a penetration region between the third conductive portion and the third conductive portion when the third conductive portion is disposed to penetrate the third conductive portion.
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