Battery Cap Vent 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 without compromising structural integrity and safety.
Innovation Solution
A secondary battery design featuring a vent system with a high-heat-resistant resin material, an adhesive portion, and a non-adhesive portion that breaks at a predetermined pressure to release internal pressure, ensuring safety while maintaining the battery's integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a vent system is added to the battery cap plate, then pressure relief and safety are improved, but structural integrity and sealing are worsened
Solution Approach 1:
The vent is divided into two functional segments: an adhesive portion for sealing attachment to the cap plate and a non-adhesive portion for pressure-responsive breaking. This segmentation allows the vent to simultaneously provide sealing integrity and pressure relief functionality.
Solution Approach 2:
Different regions of the vent have different material properties: the adhesive portion contains adhesive material for strong bonding to maintain sealing, while the non-adhesive portion lacks adhesive and is designed to break at predetermined pressure. This local differentiation resolves the contradiction between sealing and pressure relief.
2Temperature
If the vent is made from high-heat-resistant material, then thermal stability is improved, but ease of breaking at predetermined pressure is worsened
Solution Approach 1:
The vent exhibits local quality differentiation where the adhesive portion uses high-heat-resistant adhesive material for thermal stability, while the non-adhesive portion is designed with controlled breaking characteristics that allow it to fracture at predetermined pressure despite the overall heat-resistant composition.
Solution Approach 2:
The vent functions as a composite structure combining heat-resistant materials with controlled breaking properties, allowing simultaneous achievement of thermal stability and pressure-responsive breaking behavior.
3Strength
If adhesive material is applied to seal the vent, then sealing integrity is improved, but pressure-responsive breaking is worsened
Solution Approach 1:
The vent is segmented into an adhesive portion with adhesive material for sealing and a non-adhesive portion without adhesive for pressure-responsive breaking. This segmentation resolves the contradiction by spatially separating the sealing function from the pressure relief function.
Solution Approach 2:
The vent exhibits local quality differentiation where the adhesive portion contains adhesive material for strong bonding to maintain sealing integrity, while the non-adhesive portion lacks adhesive and is designed to break at predetermined pressure, enabling both sealing and pressure relief.
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 vent system effectively prevents explosion and overheating by releasing pressure at a controlled threshold, enhancing safety and reliability of secondary batteries.
Implementation Method 1
a vent (140) disposed to seal peripheral portions of the vent holes, the vent including an adhesive portion (142) including an adhesive applied to a portion corresponding to a peripheral portion of the vent holes
Implementation Method 2
the vent (140) may have a breaking pressure of 10 kgf/cm 2
Data Source
Figure 1
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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.