Motor Control Unit Capacitor Cooling Through Integrated Coolant Channels
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The heat dissipation effect on the capacitor core package in motor control units of electric vehicles is poor due to the need for heat to be transferred through multiple housings, leading to reduced efficiency and a shorter service life.
Innovation Solution
A motor control unit design that incorporates a coolant flow channel in close proximity to the capacitor core package, using a first sub-housing to enhance heat exchange efficiency, and a heat dissipation panel group that includes cavities and through holes to facilitate refrigerant circulation and improve heat dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If heat is transferred through multiple housings to cool the capacitor core package, then the structural integrity is maintained, but the heat dissipation efficiency deteriorates
Solution Approach 1:
The patent introduces a coolant flow channel as an intermediary heat dissipation pathway that directly contacts the capacitor core package through the first sub-housing. This mediator enables efficient heat transfer from the capacitor core to the coolant, bypassing the need for heat to traverse multiple housing layers, thus resolving the contradiction between structural integrity and heat dissipation efficiency
Solution Approach 2:
The patent creates a three-dimensional coolant flow channel that penetrates through the first sub-housing to directly access the capacitor core package in the accommodating cavity. This dimensional approach allows heat dissipation to occur through a direct thermal pathway rather than relying on sequential heat transfer through multiple housing layers, improving heat dissipation efficiency while maintaining structural integrity
2Loss of energy
If a coolant flow channel is introduced to improve heat dissipation, then heat dissipation efficiency is improved, but device complexity increases
Solution Approach 1:
The patent merges the heat dissipation function with the existing housing structure by forming the coolant flow channel through the first sub-housing. This integration combines the structural housing element with the heat dissipation pathway, eliminating the need for separate heat dissipation components and reducing overall device complexity while improving heat dissipation efficiency
Solution Approach 2:
The first sub-housing serves multiple functions: it provides structural support, forms the accommodating cavity for the capacitor core package, and incorporates the coolant flow channel for heat dissipation. This multi-functionality reduces the number of separate components needed, thereby improving heat dissipation efficiency without significantly increasing device complexity
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
The improved heat dissipation design enhances the efficiency of cooling the capacitor core package, leading to increased reliability and extended service life of the motor control unit.
Implementation Method 1
a gap between the heat dissipation panel group and the first sub-housing in the first direction is used to form a coolant flow channel... the coolant channel can dissipate heat for the capacitor core package located in the accommodating cavity
Implementation Method 2
The cavity is in communication with the coolant channel through the liquid inlet through hole and the liquid outlet through hole... facilitates circulation of the refrigerant in the heat dissipation panel group
Data Source
AI summary
This application relates to motor control unit technologies, and in particular, to a motor control unit, a powertrain, and a vehicle. The motor control unit includes a three-phase bridge arm, a capacitor module, and a heat dissipation panel group. The capacitor module includes a capacitor housing and a capacitor core package, and the capacitor housing includes a first sub-housing and a second sub-housing. A gap between the first sub-housing and the second sub-housing forms an accommodating cavity in a first direction, and the accommodating cavity is used to accommodate the capacitor core package. The three-phase bridge arm includes a plurality of power modules. The heat dissipation panel group is configured to dissipate heat for the plurality of power modules.