Battery Vent Adhesive Structure for Controlled Pressure Relief
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Solution Overview
Problem
Existing secondary batteries lack effective pressure relief mechanisms that prevent explosion and overheating while maintaining structural integrity under high internal pressures.
Innovation Solution
A secondary battery design incorporating a vent with an adhesive portion and a high-heat-resistant resin material, featuring elliptical shape and symmetrical structure, to seal vent holes and release pressure at a predetermined breaking point.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a vent is designed to release pressure at a predetermined breaking point, then pressure relief function is improved, but structural integrity may be compromised
Solution Approach 1:
The vent is segmented into a vent body and a vent cap that can separate from each other. The vent cap is initially attached to the vent body through adhesive, sealing the vent holes. When internal pressure exceeds the adhesive's breaking pressure, the vent cap separates from the vent body, opening the vent holes to release pressure. This segmentation allows the vent to maintain structural integrity during normal operation while providing reliable pressure relief when needed.
Solution Approach 2:
The adhesive's breaking pressure is carefully selected to be lower than the maximum pressure the battery can withstand but higher than normal operating pressures. This parameter change allows the vent to function as a pressure-sensitive device that remains closed during normal operation (maintaining structural integrity) but opens automatically when pressure exceeds the adhesive's breaking point (providing pressure relief).
2Temperature
If high-heat-resistant material is used for the vent, then temperature resistance is improved, but manufacturing complexity increases
Solution Approach 1:
The vent employs a composite structure combining a metal vent body (providing mechanical strength and structural integrity) with a high-heat-resistant resin vent cap (providing temperature resistance up to 200°C). This composite material approach allows each component to contribute its superior properties, achieving both heat resistance and ease of manufacture through modular assembly rather than requiring a single complex high-temperature material for the entire vent structure.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design effectively prevents explosion and overheating by releasing internal pressure without compromising the battery's structural integrity, using a high-heat-resistant resin material that maintains functionality up to 200°C.
Implementation Method 1
a vent disposed to seal peripheral portions of the vent holes, and including an adhesive portion including an adhesive applied to a portion corresponding to a peripheral portion of the vent holes
Implementation Method 2
the vent may have a breaking pressure of 10 kgf/cm2 to 30 kgf/cm2
Data Source
AI summary
A secondary battery including an electrode assembly, a can accommodating the electrode assembly, a cap plate coupled to a first side of the can, the cap plate including vent holes, and a vent sealing peripheral portions of the vent holes, the vent including an adhesive portion on a region corresponding to the peripheral portions of the vent holes.