Adhesive Bonding Stack With Stretch-Release Detachability
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Solution Overview
Problem
Existing adhesives used in applications like battery packs in automobiles form permanent bonds, making it difficult to detach battery cells from cooling plates, which is crucial for recycling and repair, and they lack the combination of thermal conductivity and detachability.
Innovation Solution
An adhesive bonding stack comprising a first adhesive layer attached to a substrate and a self-adhesive product with a dimensionally stable layer and a pressure-sensitive adhesive layer that is detachable by stretching, allowing the bond to be internally divisible and detachable.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional adhesives are used to bond battery cells to cooling plates, then strong adhesive properties and thermal conductivity are achieved, but the bond becomes permanent and non-detachable
Solution Approach 1:
The adhesive bonding system is segmented into three distinct layers: a first adhesive layer providing strong bonding and thermal conductivity, a dimensionally stable layer providing structural integrity, and a pressure-sensitive adhesive layer providing detachability. This segmentation allows each layer to perform its specific function without compromising the others, enabling both strong bonding and easy detachment.
Solution Approach 2:
The invention uses a composite structure combining multiple adhesive layers with different properties. The first adhesive layer (thermally conductive), dimensionally stable layer (structural), and pressure-sensitive adhesive layer (detachable) work together as a composite system, where each material contributes its unique properties to achieve the overall functionality of strong, thermally conductive, yet detachable bonding.
2Loss of energy
If thermally conductive adhesives are used to dissipate heat from accumulators, then thermal conductivity is improved, but the adhesive forms a constant non-detachable bond
Solution Approach 1:
The adhesive system is divided into functional segments where the first adhesive layer handles thermal conduction for heat dissipation, while the pressure-sensitive adhesive layer handles detachment functionality. This segmentation allows the thermal management function and the detachability function to coexist without interference.
Solution Approach 2:
The composite adhesive structure achieves multi-functionality by combining thermal conduction, structural stability, and detachability in a single bonding system. The dimensionally stable layer provides structural support, the first adhesive layer provides thermal conduction, and the pressure-sensitive layer provides detachability, making the system adaptable to multiple requirements simultaneously.
3Reliability
If permanent adhesive bonds are used in battery packs, then reliable fixation is achieved, but recycling and repair become difficult
Solution Approach 1:
The adhesive bonding stack is segmented into a permanent bonding section (first adhesive layer) for reliable fixation and a detachable section (pressure-sensitive adhesive layer) for easy separation during recycling. This allows the bond to be both reliable during operation and easily separable at end-of-life.
Solution Approach 2:
The pressure-sensitive adhesive layer is designed to be detachable, allowing battery cells to be easily separated from cooling plates for recycling and recovery of valuable materials. The first adhesive layer remains on one substrate while the pressure-sensitive layer detaches cleanly, facilitating efficient material recovery processes.
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
Enables detachable bonding with thermal conductivity, facilitating repair, exchange, and recycling of battery packs while maintaining strong adhesive properties.
Implementation Method 1
a pressure-sensitive adhesive layer (6), which is double-sidedly adhering and detachable by stretching
Implementation Method 2
Thermal conductivity is of increasing importance in this environment, particularly for applications of adhesives in electronic devices or components
Data Source
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AI summary
In an adhesive bonding stack between a first substrate (2) and a second substrate (3), formed by a first adhesive layer (4), which is double-sidedly adhering and non-detachable, the first side of the first adhesive layer (4) being attached to the first substrate, wherein the adhesive bonding stack further comprises a self-adhesive product, which comprises a dimensionally stable layer (5) provided on the second side of the first adhesive layer (4), a pressure-sensitive adhesive layer (6) provided on a second side of the dimensionally stable layer (5), which is opposite to the first adhesive layer (4), the second side of the pressure-sensitive adhesive layer (6) being attached to the second substrate (3), the detachable adhesive layer (6) being an adhesive moiety detachable by stretching, rendering the adhesive bonding stack detachable, a previously non-detachable bond becomes internally divisible and thus detachable.