Polyamide Composition for Low-Temperature Battery Overmoulding
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Solution Overview
Problem
Conventional polyamide compositions used in low-pressure overmoulding processes are unsuitable for heat-sensitive lithium-polymer batteries due to high temperature requirements and lack of mechanical and thermal properties, and they do not facilitate easy recycling.
Innovation Solution
A polyamide composition derived from the polycondensation of an acid component comprising fatty acid dimers, aliphatic diacids, and an amine component with cycloaliphatic and aliphatic diamines, which has a viscosity of less than 4 Pa·s at 185° C. and a softening point between 150° C. to 170° C., enabling low-pressure and low-temperature injection while maintaining mechanical and thermal properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional polyamide compositions are used for low-pressure overmoulding, then the process can be implemented, but the high temperature requirements (>200°C) damage heat-sensitive lithium-polymer batteries
Solution Approach 1:
The patent modifies the chemical composition parameters of the polyamide by incorporating specific ratios of fatty acid dimers (30-50 mol%), aliphatic diacids (30-50 mol%), cycloaliphatic diamines (10-40 mol%), and aliphatic diamines (50-80 mol%). This compositional parameter change reduces the melting point from conventional >200°C to 150-170°C, enabling low-temperature injection that protects heat-sensitive batteries while maintaining manufacturability.
2Strength
If high temperature injection is used to ensure good mechanical properties, then the polyamide achieves sufficient strength, but the heat-sensitive battery is damaged
Solution Approach 1:
The patent creates a composite polyamide system combining multiple components: fatty acid dimers, aliphatic diacids, cycloaliphatic diamines, and aliphatic diamines in specific proportions. This composite material achieves optimal balance between mechanical strength (tensile strength ≥3 MPa, elongation at break ≥80%) and thermal properties (softening point 150-170°C), allowing injection below battery damage thresholds while maintaining structural integrity.
3Productivity
If conventional polyamide compositions are used, then the overmoulding process can be completed, but the resulting product is difficult to recycle
Solution Approach 1:
The patent designs the polyamide composition with recyclability as a key feature. The specific combination of components (fatty acid dimers, aliphatic diacids, cycloaliphatic diamines, aliphatic diamines) creates a material that maintains good processability for complete overmoulding while enabling easy recycling through controlled degradation or reprocessing at lower temperatures, facilitating battery recycling when electronic devices break down.
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 polyamide composition allows for the successful overmoulding of heat-sensitive batteries with improved mechanical and thermal properties, including high tensile strength and elongation at break, and facilitates easy removal from moulds, while also being recyclable.
Implementation Method 1
a polyamide which is the product of the polycondensation of an acid component and of an amine component
Implementation Method 2
a viscosity of less than or equal to 4 Pa·s at 185° C.
Implementation Method 3
a softening point ranging from 150° C. to 170° C.
Data Source
AI summary
The present invention relates to a polyamide composition comprising a polyamide which is the poly condensation product of an acid component and an amine component, the acid component comprising, per mole of acid component; −30 to 50 mol. % of fatty acid dimer(s); −30 to 50 mol. % of aliphatic dibasic acid(s); −0 to 10 mol. % of chain limiter(s); the amine component comprising, per mole of amine component; −10 to 40 mol. % of cycloaliphatic diamine(s); and −50 to 80 mol. % of aliphatic diamine(s) comprising 3 to 12 carbon atoms); −0 to 15 mol. % of polyetheramine(s); said polyamide composition having; —a viscosity less than or equal to 4 Pa·s at 185° C.; and —a softening temperature ranging from 150° C. to 170° C.