Battery Terminal Feed-Through Sealing System
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Solution Overview
Problem
Existing sealing systems for terminal feed-throughs in lithium-ion batteries face challenges such as embrittlement under mechanical and chemical loading, limited elasticity, and susceptibility to stress cracking, leading to sealing failures, which affect long-term mechanical stability and chemical resistance.
Innovation Solution
A terminal feed-through design featuring a metal housing with a glass or ceramic-based support element and a concentrically arranged sealing element, where the support element forms an annular gap with the housing outer wall and the sealing element is formed by injecting a liquid polymer compound into the gap, providing enhanced insulation, mechanical stability, and chemical resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If plastic-based sealing materials are used, then ease of manufacture and initial sealing performance are improved, but long-term mechanical stability and chemical resistance deteriorate due to embrittlement under mechanical and chemical loading
Solution Approach 1:
The sealing system is divided into two distinct functional components: a glass or ceramic support element that provides mechanical stability and load-bearing capacity, and a plastic sealing element that provides sealing function. This segmentation allows each material to perform its optimal function without suffering from the weaknesses of the other.
Solution Approach 2:
The invention uses a composite structure combining inorganic materials (glass or ceramic) with organic materials (plastic). The glass or ceramic support element provides dimensional stability and chemical resistance, while the plastic sealing element provides elastomeric sealing properties. Together they form a composite sealing system that overcomes the limitations of pure plastic materials.
2Reliability
If glass-based sealing materials are used, then chemical resistance and thermal stability are improved, but mechanical elasticity and tolerance to moment loads deteriorate due to low elasticity
Solution Approach 1:
The sealing system is divided into two distinct functional components: a glass or ceramic support element that provides mechanical stability and load-bearing capacity, and a plastic sealing element that provides sealing function. This segmentation allows each material to perform its optimal function without suffering from the weaknesses of the other.
Solution Approach 2:
The invention uses a composite structure combining inorganic materials (glass or ceramic) with organic materials (plastic). The glass or ceramic support element provides dimensional stability and chemical resistance, while the plastic sealing element provides elastomeric sealing properties. Together they form a composite sealing system that overcomes the limitations of pure glass materials.
3Device complexity
If a single-material sealing system is used, then device complexity is reduced, but ability to withstand cyclic temperature stress and mechanical loads simultaneously deteriorates
Solution Approach 1:
The invention uses a composite structure combining inorganic materials (glass or ceramic) with organic materials (plastic). The glass or ceramic support element provides dimensional stability and chemical resistance, while the plastic sealing element provides elastomeric sealing properties. Together they form a composite sealing system that overcomes the limitations of pure glass materials.
Solution Approach 2:
Different parts of the sealing system have different material properties optimized for their specific functions: the support element has high rigidity and thermal stability for structural support, while the sealing element has high elasticity for sealing and accommodating thermal expansion. This local optimization of material properties enables the system to withstand cyclic temperature stress effectively.
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 solution significantly increases the service life of the sealing system by isolating mechanical loads from the sealing element, ensuring long-term stability and resistance to cyclic temperature stress and chemical exposure, thereby improving the overall performance of the battery.
Implementation Method 1
The sealing element is formed by injecting a liquid polymer compound into the gap
Implementation Method 2
an electrically insulating and annular support element surrounding the shaft of the terminal stud
Implementation Method 3
chemical resistance to various electrolyte systems
Implementation Method 4
at least one clamping element sitting on the shaft and covering the through-hole, and forming an annular gap together with the housing outer wall
Data Source
AI summary
A battery includes an outer wall having a through-hole defined by a peripheral opening edge, at least one cell having a positive electrode and a negative electrode, an electrically conductive terminal stud connected to the positive electrode or the negative electrode, including a shaft extending through the through-hole, and at least one clamping element sitting on the shaft and covering the through-hole, and forming an annular gap together with the outer wall, an electrically insulating and annular support element surrounding the shaft of the terminal stud in a sleeve-like manner, and having an outward-facing peripheral contact surface against which the opening edge of the through-hole lies, wherein the support element includes a glass or a ceramic, or a glass- or ceramic-based composite material, and a sealing element arranged concentrically around the support element in the gap between the clamping element and the outer wall.