Electric Work Vehicle PDU Layout for Safer Battery Cooling
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Solution Overview
Problem
Existing electric work vehicles, such as electric tractors, face challenges in efficiently distributing power and cooling their battery systems, which can affect performance and longevity.
Innovation Solution
The electric work vehicle incorporates a power distribution unit (PDU) with separate housings for positive and negative rails, strategically located battery strings connected through contactors, and an air cooling system with evaporators and ducts to manage temperature effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single housing is used for both positive and negative rails in the power distribution unit, then the device complexity is reduced, but the reliability and safety of power distribution deteriorate due to potential short circuits and heat accumulation
Solution Approach 1:
The power distribution unit is divided into separate housings for positive rails and negative rails. This segmentation prevents short circuits between opposite polarity rails, reduces heat accumulation by separating heat-generating components, and improves overall system reliability while maintaining manageable complexity through modular design.
2Volume of moving object
If battery modules are placed close together to reduce vehicle size, then the volume of the vehicle is reduced, but the cooling efficiency deteriorates due to insufficient air flow and heat dissipation
Solution Approach 1:
The battery housing is designed with differentiated local structures: insulation walls between adjacent battery modules to reduce heat transfer, and open-side designs at front and rear ends to maximize air flow. This local quality variation optimizes both thermal isolation and heat dissipation, enabling compact battery arrangement while maintaining effective cooling.
3Temperature
If insulation walls are added between battery modules to improve cooling, then the cooling efficiency is improved, but the device complexity and space utilization deteriorate
Solution Approach 1:
The battery housing is segmented into modular units with insulation walls positioned only where thermally critical. The modular design allows standardized components to be replicated, managing complexity through repetition rather than unique custom parts for each section.
Solution Approach 2:
The insulation walls serve multiple functions: thermal isolation between modules, structural support for battery placement, and guidance for assembly. This multi-functionality reduces the need for additional dedicated cooling components, managing overall system complexity.
4Use of energy by moving object
If contactors are placed close to battery strings to reduce connection length, then the use of energy is reduced, but the reliability deteriorates due to increased heat exposure and potential interference
Solution Approach 1:
The power distribution unit serves as an intermediary structure that houses both contactors and battery terminals in a controlled environment. This intermediary design allows optimized connection length for energy efficiency while providing thermal management and protection to maintain component reliability.
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 power distribution, improves battery cooling efficiency, and extends the vehicle's operational life by maintaining optimal temperature and charge levels.
Implementation Method 1
at least one evaporator is located between the first PDU housing and the second PDU housing
Implementation Method 2
improves battery cooling efficiency, and extends the vehicle's operational life by maintaining optimal temperature
Data Source
Figure 1A
Figure 1B
Figure 1C
AI summary
An electric work vehicle (1) includes a power distribution unit (PDU) (130). The PDU includes a first PDU housing to house a positive rail (130-1) and a second PDU housing to house a negative rail (130-2), and the first PDU housing is spaced away from the second PDU housing. The first PDU housing is located on a first side of a centerline (CL) of the electric work vehicle (1) that extends in a front-rear direction of the electric work vehicle, and the second PDU housing is located on a second side of the centerline (CL) of the electric work vehicle opposite to the first side of the centerline (CL) of the electric work vehicle.