Mesh Contact Element for Thermal Stress in Energy Storage
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Solution Overview
Problem
Electrical energy storage devices face thermal fatigue and potential failures due to temperature variations, which can weaken the connection between the busbar and electrical components, leading to open circuits.
Innovation Solution
The use of a contact element formed partially as a mesh to absorb mechanical stress caused by temperature variations, providing a more resilient connection between the busbar and electrical components, allowing for adaptation to different component sizes and orientations, and enabling efficient electrical contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a rigid busbar connection is used to ensure stable electrical contact, then electrical conductivity is improved, but the connection becomes vulnerable to thermal fatigue and mechanical stress from temperature variations
Solution Approach 1:
The patent applies a flexible busbar design that can bend and deform to accommodate thermal expansion and contraction of electrical components. The flexible busbar includes a substrate layer with conductive layers that maintain electrical contact while flexing, allowing the connection to absorb mechanical stress from temperature variations without failing. This resolves the contradiction by providing both electrical conductivity and thermal stress resistance through flexibility.
Solution Approach 2:
The patent changes the physical parameters of the busbar by using multiple conductive layers with different properties (copper layer for conductivity, aluminum layer for thermal management, silver layer for contact resistance reduction). The layered structure allows each layer to respond differently to thermal stress while maintaining overall electrical connection stability, resolving the contradiction between conductivity and thermal resistance.
2Strength
If a mesh contact element is used to absorb mechanical stress from temperature variations, then resistance to thermal stress is improved, but electrical contact area is reduced
Solution Approach 1:
The mesh contact element is formed from a flexible substrate with conductive patterns that can deform under thermal stress. The mesh structure provides mechanical compliance to absorb expansion and contraction forces while the continuous conductive paths maintain electrical contact. This resolves the contradiction by demonstrating that flexibility does not necessarily reduce electrical contact reliability when properly designed.
Solution Approach 2:
The contact element uses composite construction with multiple conductive layers (copper, aluminum, silver) deposited on a flexible substrate. This composite structure provides both the mechanical flexibility needed for thermal stress resistance and the electrical conductivity required for reliable contact, resolving the apparent contradiction between mesh structure and contact area.
3Adaptability or versatility
If a flexible busbar design is used to accommodate thermal expansion, then adaptability to temperature variations is improved, but structural rigidity is reduced
Solution Approach 1:
The busbar employs a flexible substrate design that allows controlled deformation to accommodate thermal expansion of connected components. The flexibility is engineered through the substrate material and layer structure, providing adaptability while maintaining sufficient structural integrity through the multi-layer composite construction and anchoring mechanisms.
Solution Approach 2:
The busbar is divided into multiple functional layers (substrate, copper layer, aluminum layer, silver layer) that can respond independently to thermal stress. This segmentation allows the structure to flex and adapt to temperature changes while each layer contributes to overall structural strength, resolving the contradiction between flexibility and rigidity.
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 mesh contact element enhances the resistance to thermal stress, improving the lifespan of electrical energy storage devices by maintaining a stable connection and allowing for flexible integration into various spaces while ensuring reliable electrical contact.
Implementation Method 1
the mesh absorbs mechanical stress caused by small relative rearrangements of the electrical components and/or the busbar as a result of the temperature variations
Data Source
AI summary
Electrical energy storage device (1), including at least one electrical component (2) and a busbar (5) for electrical power distribution, where the electrical component (2) is arranged on the busbar (5), and at least a first contact side (11) and/or a second contact side (12) of the electrical component (2) is connected to the busbar (5) by a contact element (8), and wherein the contact element (8) is formed at least partially as a mesh (7). The electrical component (2) is preferably a capacitor.


