Straddle Electric Vehicle Battery Cooling Air Box Design
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Solution Overview
Problem
In straddle electric vehicles, the ram air inlet can allow muddy water or rain to enter the battery case, compromising cooling efficiency and reliability due to increased passage resistance from filters used to prevent moisture ingress.
Innovation Solution
A straddle electric vehicle design featuring an air box attached to the upper portion of the battery case, which captures moisture and directs air to the battery while preventing water ingress, with an air inlet duct and ram air supply port to enhance cooling and protect electric components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a filter element with small pores is provided at the ram air inlet to prevent muddy water ingress, then moisture ingress is suppressed, but passage resistance increases and cooling efficiency deteriorates
Solution Approach 1:
The invention divides the air intake system into two separate pathways: a first air inlet for introducing air containing moisture to the air box, and a second air inlet for introducing dry air directly to the battery case. This segmentation allows the system to obtain cooled air without passing through the filter element, thereby maintaining low passage resistance while still preventing moisture ingress through the filter-equipped first pathway.
Solution Approach 2:
The air box serves as an intermediary component that receives air from the first air inlet, passes it through the filter element to remove moisture, and then supplies the filtered air to the battery case. This intermediary structure enables moisture removal without requiring the main cooling air pathway to pass through the filter, thus balancing moisture prevention with cooling efficiency.
2Shape
If the battery is covered with a battery case, then external appearance is improved and protection is enhanced, but moisture ingress prevention becomes more difficult
Solution Approach 1:
The air intake system is segmented into two separate inlets: the first air inlet that introduces air to the air box for filtering, and the second air inlet that introduces air directly to the battery case. This segmentation allows the battery case to remain covered for aesthetic purposes while still providing effective cooling through the second inlet and moisture prevention through the filtered first pathway.
Solution Approach 2:
The air box acts as an intermediary that handles moisture filtering separately from the main battery cooling pathway. This allows the battery case to be properly covered for appearance while the intermediary air box manages moisture prevention through its filter element.
3Productivity
If the ram air inlet opens downward to facilitate air flow, then cooling efficiency is improved, but muddy water splashing increases and moisture ingress risk rises
Solution Approach 1:
The system segments air intake into two pathways: the first air inlet positioned to introduce air to the air box (where moisture is filtered), and the second air inlet positioned to introduce air directly to the battery case. This segmentation allows the first inlet to be positioned for optimal cooling while the filter in the air box prevents muddy water from entering through either inlet.
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
Effectively suppresses moisture ingress into the battery case, ensuring reliable operation and efficient cooling of the battery and electric components while maintaining a clean external appearance.
Implementation Method 1
since the ram air is sent to the battery case via the air box, moisture contained in the ram air can be captured in the air box
Implementation Method 2
a straddle electric vehicle which drives by a driving power generated by an electric motor
Implementation Method 3
the battery is repeatedly charged and discharged with a current of a great magnitude in response to the acceleration/deceleration operation of the electric motor for moving a vehicle body and thereby generates heat, and therefore it is necessary to appropriately cool the battery
Data Source
Figure 1
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AI summary
A straddle electric vehicle (1) comprises a battery case (23) accommodating a battery (22) which is an electric power supply for an electric motor (5); and an air box (51) attached to an upper portion of the battery case (23), and the air box (51) includes a ram air inlet (61b) through which ram air flows into the air box, and a ram air supply port (54a) through which the air is supplied from inside the air box to the battery case (23).