EV Cooling System Fan Gap Negative Pressure Ventilation
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Solution Overview
Problem
Conventional cooling systems for electric vehicles increase thermal burden on electrical components by heating the air inside the box, necessitating additional ventilation fans that raise costs and occupy space, while existing systems fail to efficiently cool areas outside the heat dissipating fins.
Innovation Solution
A cooling system for electric vehicles that uses a fan to draw air through a cooling duct covering heat dissipating fins and incorporates an exhaust air duct with a gap between the fan case and air inlet, creating a negative pressure to efficiently cool the electrical component and discharge hot air outside, without requiring a dedicated ventilation fan.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a ventilation fan is added to ventilate the inside of the box and prevent air temperature rise, then the thermal burden on the electrical component is reduced, but the mounting space and costs are increased
Solution Approach 1:
The fan case is designed to perform multiple functions: it serves as the cooling fan for the heat dissipating fins and simultaneously acts as the ventilation fan for the box interior. The exhaust air duct is positioned to extend into the box, and its air inlet faces the air discharge port of the fan case, creating a system where the same fan and power source provide both localized cooling and general ventilation, thereby reducing device complexity and mounting space requirements.
2Productivity
If the air discharge port of the fan case is positioned to face the air inlet of the exhaust air duct with a gap, then negative pressure is created to discharge hot air efficiently, but the structural complexity of the air passage increases
Solution Approach 1:
The gap between the air discharge port of the fan case and the air inlet of the exhaust air duct acts as an intermediary element. This gap serves as a communication passage that allows air to flow from the cooling duct to the exhaust air duct while maintaining negative pressure in the box. The gap simplifies the overall structure by eliminating the need for complex sealing mechanisms or additional air passages, while still achieving efficient hot air discharge through the created pressure differential.
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 enhances cooling performance for electrical components by efficiently cooling both heat dissipating fins and other areas within the box, reduces manufacturing complexity and costs, and improves ventilation inside the vehicle, effectively addressing the thermal burden without additional fans.
Implementation Method 1
a fan for drawing air is coupled to an air outlet portion of the cooling duct
Implementation Method 2
a predetermined space formed between the air discharge port of the fan case and the air inlet of the exhaust air duct
Data Source
AI summary
A cooling system for an electric vehicle is provided, wherein an exhaust air duct extending into a box is disposed in an air outlet of the box disposed in a lower portion of the vehicle interior; an air discharge port of the fan case coupled to the air outlet portion of the cooling duct faces an air inlet of the exhaust air duct with a predetermined gap therebetween in a direction of air flow; and when the air discharge port of the fan case is projected on a plane including the air inlet of the exhaust air duct, the air discharge port of the fan case is opened inside the air inlet of the exhaust air duct and a predetermined gap is formed in a transverse direction to the air flow between the air discharge port of the fan case and the air inlet of the exhaust air duct.