Conductive Housing Protrusions for Shielding and Heat Dissipation
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Solution Overview
Problem
Electrical devices, such as those in electric vehicles, face challenges in achieving effective electromagnetic shielding and heat dissipation due to gaps between the main body and lid, which can lead to increased contact resistance, rattling noise, and inefficient heat discharge.
Innovation Solution
The design includes a housing with a main body and lid that are electrically conductive, featuring protrusions on the bottom surface of the lid and top surface of the main body for vertical contact, allowing for improved contact pressure and reduced contact resistance, while a gap between these surfaces facilitates efficient heat dissipation through heat convection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the main body and lid are connected via raised portions with contact directions perpendicular to the fixing direction, then electromagnetic shielding is achieved, but contact pressure is insufficient and contact resistance increases
Solution Approach 1:
The contact direction between the main body and lid is changed from perpendicular (horizontal) to parallel (vertical) relative to the fixing direction. This dimensional change allows the contact pressure to be applied in the same direction as the fixing force, significantly improving contact pressure and reducing contact resistance while maintaining electromagnetic shielding effectiveness.
2Object-affected harmful factors
If the distances between facing pairs of sidewalls of the lid are made small to increase contact pressure, then contact pressure increases, but it becomes difficult to fit the lid onto the main body and productivity decreases
Solution Approach 1:
By changing the contact direction to be parallel to the fixing direction rather than perpendicular, the invention eliminates the need to reduce sidewall distances to increase contact pressure. The contact pressure is now generated by the fixing force itself, allowing normal assembly clearances to be maintained while still achieving low contact resistance.
3Reliability
If the lower ends of the sidewalls of the lid are positioned close to the bottom wall of the main body, then electromagnetic shielding is improved, but heat discharge performance deteriorates
Solution Approach 1:
The housing is segmented into an upper closed portion (main body and lid forming an enclosed space for electromagnetic shielding) and a lower open portion (with gaps between sidewalls for heat discharge). This segmentation allows the upper portion to provide effective electromagnetic shielding while the lower portion maintains open pathways for heat convection, resolving the conflict between shielding effectiveness and thermal management.
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 configuration enhances electromagnetic shielding, stabilizes the device against vibration, and effectively discharges heat generated by electrical components, improving the overall performance of the electrical device.
Implementation Method 1
the contact pressure between the main body and the lid at the protrusions is increased, thereby lowering the contact resistance between the main body and the lid
Implementation Method 2
the heat is discharged outside of the housing by discharging the high-temperature air in the internal space of the housing to the external environment via the gaps formed between the inner surfaces of the sidewalls of the lid and the outer surfaces of the sidewalls of the main body
Implementation Method 3
the housing generally has a main body and a lid both of which are electrically conductive, so as to electromagnetically shield the electrical components received in the housing. Consequently, electromagnetic noise generated by the electrical components can be prevented from leaking outside of the housing
Implementation Method 4
with the direction of contact between the main body and the lid at the protrusions coincident with the direction of fastening the lid to the main body, it is possible to stabilize the fixed state of the main body and the lid, thereby suppressing rattling noise caused by vibration between the main body and the lid
Data Source
AI summary
An electrical device has a housing that includes a main body and a lid both of which are electrically conductive. The lid is fastened to a top surface of a sidewall of the main body so as to cover the main body. On at least one of a bottom surface of the lid and the top surface of the sidewall of the main body, there are formed a plurality of protrusions at predetermined positions; each of the protrusions abuts against that one of the bottom surface of the lid and the top surface of the sidewall which is opposed to the protrusion. Except at those predetermined positions where the protrusions are formed, there is provided, between the bottom surface of the lid and the top surface of the sidewall of the main body, a gap via which the internal and external spaces of the housing communicate with each other.