Secondary Battery Safety Vent Structure for Unrestricted Gas Discharge
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Solution Overview
Problem
Conventional cylindrical secondary batteries face challenges in providing effective internal gas discharge paths while maintaining structural rigidity and vibration resistance, particularly due to spatial restrictions and interference from the upper end cap during gas discharge.
Innovation Solution
The design features a safety vent exposed to the outside with a notch portion forming a closed structure, allowing for a crimping joint and curling portion to enhance rigidity and vibration resistance, ensuring full gas discharge without interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a wound type current collector is used to improve flexibility and reduce breakage, then the mechanical reliability is improved, but the manufacturing precision deteriorates due to shape changes during winding
Solution Approach 1:
The current collector is pre-formed with a specific three-dimensional shape (convex/concave patterns) before winding. This preliminary shaping compensates for expected deformation during the winding process, ensuring that the final assembled battery maintains proper electrode alignment and contact pressure despite the flexibility needed for mechanical reliability.
2Quantity of substance
If the battery capacity is increased to meet higher energy demands, then the energy storage is improved, but the heat generation increases causing safety issues
Solution Approach 1:
The battery employs porous heat dissipation structures within the electrode assembly or housing that increase surface area for thermal exchange. These porous materials facilitate efficient heat transfer from the active materials to the cooling system, allowing higher capacity batteries to operate safely by managing the increased heat generation through enhanced thermal conductivity and surface area.
Data Source
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AI summary
A secondary battery according to an embodiment of the present disclosure includes an electrode assembly; a battery case that houses the electrode assembly and has an opened upper part; and a cap assembly that is coupled to the opened upper part of the battery case, wherein the cap assembly comprises a safety vent formed with a notch portion, and wherein a gap formed by the notch portion is closed.