EV Battery Case Mounting With Underfloor Air Duct Cooling
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Solution Overview
Problem
Electric vehicle battery cases pose challenges due to their large volume and weight, requiring efficient mounting and cooling solutions that also optimize interior space and minimize heat generation.
Innovation Solution
A battery case mounting structure where the battery case is positioned below the vehicle body floor, utilizing interior air for cooling through an intake and discharge duct system that avoids interference with passenger space and effectively manages moisture, simplifying the cooling process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the battery case is mounted on the vehicle body, then the battery modules can be cooled, but the interior space is reduced and the cooling structure becomes complex
Solution Approach 1:
The battery case is relocated from the interior space to the lower side of the vehicle body floor, utilizing the vertical dimension below the floor. This allows the battery modules to be cooled while preserving the interior space, as the cooling structure is positioned in the spatial dimension beneath the vehicle body rather than occupying interior volume.
2Temperature
If a separate cooling structure is provided for battery modules, then cooling efficiency is improved, but the device complexity increases
Solution Approach 1:
The cooling structure is integrated with the existing air conditioning system of the vehicle. The air conditioning ducts are utilized to supply cooled air to the battery case, and the same ducts are used to discharge the heated air. This merging of functions reduces the number of separate cooling components needed, thereby reducing device complexity while maintaining cooling efficiency.
3Temperature
If the battery case is positioned to maximize cooling, then cooling performance is improved, but interference with passenger space occurs
Solution Approach 1:
The battery case is positioned in the vertical dimension below the vehicle body floor, specifically on the lower side, which is spatially separated from the passenger compartment. This dimensional relocation allows the battery case to be optimally positioned for cooling performance without interfering with passenger space, as the two systems operate in different spatial zones.
4Volume of moving object
If the battery case is mounted below the vehicle body floor, then interior space is provided, but moisture damage risk increases
Solution Approach 1:
The air conditioning ducts are extended to reach the battery case location below the vehicle body floor. The air conditioning system extracts and circulates air through these extended ducts to provide cooling to the battery modules. This allows the battery case to be positioned below the floor for interior space benefits while the air conditioning system actively manages the thermal environment, reducing moisture accumulation risk through continuous air circulation and temperature control.
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 provides interior space, simplifies the cooling structure, and ensures efficient cooling of battery modules while minimizing interference with passenger space and reducing the risk of moisture damage.
Implementation Method 1
an intake duct configured to communicate with the air inlet at an upper portion of the vehicle body floor and guide interior air to an interior of the battery case
Implementation Method 2
a discharge duct configured to communicate with the air outlet at an upper portion of the vehicle body floor, extending to the rear side of the vehicle body floor, and configured to discharge air, which cooled the battery module, to an outside
Data Source
AI summary
A battery case mounting structure for an electric vehicle includes: a vehicle body floor in which a plurality of seats are installed; a battery case provided below the vehicle body floor, having a battery module therein, and including an air inlet, through which air is suctioned, disposed on a rear side of the battery case, and an air outlet, through which air is discharged, disposed on a front side of the battery case; an intake duct configured to communicate with the air inlet at an upper portion of the vehicle body floor and guide interior air to an interior of the battery case; and a discharge duct configured to communicate with the air outlet at the upper portion of the vehicle body floor, extending from the upper portion of the vehicle floor to a rear side of the vehicle body floor, and configured to discharge air to outside.