Double-Sided Capacitor Module Cooling in Compact Motor Control Units
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Solution Overview
Problem
The heat dissipation efficiency of capacitor modules in motor control units is low, affecting the service life of the capacitor core package in electric vehicles.
Innovation Solution
A motor control unit design with a liquid cooling radiator and coolant channels on both sides of the capacitor core package, enhancing heat dissipation through a copper bar connection and a compact layout for improved thermal conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional heat dissipation structure is used for capacitor module, then device complexity is reduced, but heat dissipation efficiency deteriorates
Solution Approach 1:
The patent merges the heat dissipation function into the capacitor module housing itself by integrating coolant channels directly into the housing structure. This allows the housing to serve dual purposes: structural containment and thermal management, thereby improving heat dissipation efficiency without proportionally increasing device complexity
Solution Approach 2:
The capacitor module housing is designed with multi-functionality, serving both as the structural enclosure for the capacitor core package and as a heat dissipation component with integrated coolant channels. This universal design enables the same component to perform multiple functions, addressing thermal management needs while maintaining structural integrity
2Volume of moving object
If compact layout is implemented for motor control unit, then space utilization is improved, but heat dissipation efficiency deteriorates
Solution Approach 1:
The patent transitions from conventional single-sided heat dissipation to double-sided heat dissipation by positioning coolant channels on both sides of the capacitor core package within the housing. This dimensional change in heat dissipation approach allows efficient thermal management within a compact volume, as heat can be extracted from both surfaces simultaneously
Solution Approach 2:
The housing is designed with localized coolant channels positioned specifically on both sides of the capacitor core package, creating optimal local heat transfer zones. This local quality approach ensures that heat dissipation is concentrated where it is most needed, maintaining efficiency within compact dimensions
3Temperature
If double-sided heat dissipation structure is used for capacitor core package, then heat dissipation efficiency is improved, but device complexity increases
Solution Approach 1:
The coolant channels are merged directly into the capacitor module housing structure rather than being separate components. This integration eliminates the need for additional external cooling structures, achieving double-sided heat dissipation while avoiding proportional increases in device complexity
Solution Approach 2:
The capacitor module housing serves its own heat dissipation needs through integrated coolant channels, eliminating the need for separate dedicated cooling structures. The housing structure itself becomes the heat dissipation mechanism, reducing overall system complexity while improving thermal management
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 design achieves efficient double-sided heat dissipation, extending the service life of the capacitor core package and facilitating a compact, integrated motor control unit.
Implementation Method 1
The liquid cooling radiator is configured to dissipate heat for the plurality of power modules
Implementation Method 2
heat exchange effect between the capacitor core package and the external heat dissipation structure
Implementation Method 3
heat generated by the capacitor core package can be dissipated by the coolant channels and the heat dissipation cavity
Implementation Method 4
coolant channel communicates with a radiator of the liquid cooling radiator through one coolant through hole
Data Source
AI summary
Examples of a motor control device for double-sided heat dissipation of a capacitor device, a powertrain, and a vehicle are described. One example motor control device includes a three-phase bridge arm, a capacitor device, a liquid cooling radiator, and a control device housing. The three-phase bridge arm includes a plurality of power devices. The capacitor device includes a capacitor housing and a capacitor core package, the capacitor housing is configured to accommodate the capacitor core package, and the capacitor housing includes two coolant through holes. The bottom shell of the control device housing includes two coolant channels, and each coolant channel communicates with the heat dissipation cavity of the liquid cooling radiator through one coolant through hole. In some embodiments, the capacitor core package in the motor control device for double-sided heat dissipation of a capacitor device implements double-sided heat dissipation.