Secondary Battery Cap Assembly Dew Condensation Prevention
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Solution Overview
Problem
Secondary batteries face issues with accelerated deterioration and capacity reduction due to short-circuiting caused by dew condensation, leading to corrosion of internal components.
Innovation Solution
The design incorporates an inversion plate with a deformable round part that contacts the terminal plate when internal pressure exceeds a preset level, allowing air to be exhausted through an air hole, and a sealing member with a thermoplastic elastomer to prevent short-circuits and corrosion, including a sealing ring and air hole cover to manage dew condensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a sealing member is added to prevent dew condensation and short-circuiting, then reliability is improved, but device complexity increases
Solution Approach 1:
The sealing member is integrated within the cap assembly structure, with the air hole cover nested within the cap plate and the sealing ring positioned within the groove of the cap assembly. This nesting approach allows multiple protective functions to be incorporated without proportionally increasing overall device complexity.
Solution Approach 2:
The air hole cover acts as an intermediary component that selectively controls the air hole, allowing it to open under pressure to prevent dew condensation while maintaining sealing under normal conditions. This intermediary mechanism resolves the contradiction by providing conditional protection rather than continuous complex sealing.
2Reliability
If an air hole is incorporated to exhaust air and prevent dew condensation, then reliability is improved, but manufacturing precision requirements increase
Solution Approach 1:
The air hole is pre-formed in the cap plate at a specific position during manufacturing, and the sealing member is pre-positioned in its groove. This preliminary action ensures that the critical air hole positioning is established early in the manufacturing process, reducing the need for high-precision assembly operations later.
Solution Approach 2:
The sealing function is segmented into multiple components: the sealing ring in the groove, the air hole cover, and the inversion plate. This segmentation allows each component to be manufactured and positioned independently with relaxed tolerances, rather than requiring a single complex high-precision component.
3Reliability
If the inversion plate with deformable round part is added to contact terminal plate under pressure, then safety is improved, but device complexity increases
Solution Approach 1:
The inversion plate's round part is designed to automatically deform and contact the terminal plate when internal pressure exceeds a preset level, creating a self-activating pressure relief mechanism. This self-service approach improves safety without requiring external control systems or complex actuation mechanisms.
Solution Approach 2:
The inversion plate utilizes material parameter changes through elastic deformation of the round part in response to pressure changes. This passive parameter-based response mechanism provides safety functionality while maintaining simple structural implementation.
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
This solution effectively prevents short-circuiting and corrosion, maintaining battery capacity and extending the lifespan by managing internal pressure and dew condensation.
Implementation Method 1
when the internal pressure of the case exceeds a preset pressure
Implementation Method 2
The round part of the inversion plate may be deformable to be brought into contact with the terminal plate
Implementation Method 3
accelerated deterioration and capacity reduction due to short-circuiting caused by dew condensation
Data Source
AI summary
The secondary battery includes an electrode assembly, a case accommodating the electrode assembly, a cap plate sealing the case and including an inversion plate, and a terminal assembly. The terminal assembly includes an insulation plate coupled to a top surface of the cap plate and having a short-circuit hole corresponding to the inversion plate and an air hole spaced apart from the short-circuit hole, a terminal plate coupled to a top surface of the insulation plate and electrically connected to the electrode assembly, and a sealing member coupled to a bottom surface of the insulation plate and opening or closing the air hole.