Potential Equalization via Bondable Coating in Motor Vehicle Control Devices
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Solution Overview
Problem
Existing methods for establishing potential equalization in motor vehicle control devices through direct bonding between a circuit carrier and an aluminum base plate are costly and environmentally harmful due to the need for mechanical processing and strict cleanliness requirements.
Innovation Solution
A contact-making element with a bondable surface coating, such as electrodeposited or chemically deposited materials like aluminum, copper, or nickel/gold, is used to establish an electrically conductive connection between the circuit carrier and the carrier structure, eliminating the need for mechanical processing and ensuring a secure bond.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If direct bonding connection from circuit carrier to aluminum base plate is provided, then potential equalization is achieved, but mechanical processing is required which increases production costs and environmental harm
Solution Approach 1:
A contact-making element with bondable surface coating acts as an intermediary between the circuit carrier and the aluminum base plate. This mediator enables reliable electrical connection without requiring mechanical processing of the base plate, thus resolving the contradiction between bonding reliability and manufacturing simplicity
Solution Approach 2:
The invention changes the surface parameter of the contact-making element by applying a bondable coating (such as tin, lead, zinc, or their alloys). This parameter change enables direct bonding without mechanical processing, achieving both reliable connection and ease of manufacture
2Ease of manufacture
If mechanical processing of bonding area is performed, then bondability is improved, but additional production costs and environmental harm result
Solution Approach 1:
The bondable surface coating is applied to the contact-making element in advance during its manufacturing process, before installation. This preliminary action ensures bondability is already present, eliminating the need for environmental-harmful processing at the assembly stage
Solution Approach 2:
The pre-coated contact-making element serves as an intermediary that brings its own bondable surface properties, eliminating the need to process the aluminum base plate and thus avoiding environmental harm from solvents like perchloroethylene
3Manufacturing precision
If bonding area is mechanically processed, then surface condition requirements are met, but production time and costs increase
Solution Approach 1:
The contact-making element with pre-applied bondable coating serves as a mediator that provides the required surface quality without requiring processing of the base plate, thus maintaining manufacturing precision while improving production efficiency
Solution Approach 2:
The surface parameters (bondability, roughness, cleanliness) are changed by applying coating to the contact-making element rather than processing the base plate. This parameter transfer enables secure bonding without time-consuming mechanical processing, enhancing productivity
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 simplifies the potential equalization process, reduces production costs, and ensures a reliable electrical connection without the environmental harm associated with traditional methods, while allowing for connections with varying materials and surface conditions.
Implementation Method 1
the surface coating on the contact-making element comprises electrodeposited or chemically deposited material
Implementation Method 2
the surface coating on the contact-making element comprises electrodeposited or chemically deposited material
Data Source
AI summary
An arrangement for potential equalization in a control device for a motor vehicle includes at least one electrical component on a circuit carrier, a carrier structure on which the circuit carrier is arranged, and at least one contacting element that electroconductively connects the circuit carrier to the carrier structure by way of a connecting element that forms a potential equalization. The contacting element has a bondable surface coating.