Capacitor Bus Bar Heat Dissipation via Segmented Support
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Solution Overview
Problem
Conventional capacitors are prone to heat damage due to inadequate heat dissipation, particularly in applications with high current flow, such as electric automobiles, where heat generated in external terminals and bus bars is not effectively dissipated, leading to potential damage of the capacitor element.
Innovation Solution
The design includes a bus bar configuration with an extension part and connection terminal that extends outside the case, supported by a case with a supporting part, creating a space for enhanced heat dissipation, and using a thicker outer bus bar with increased thermal conductivity and a complex structure to improve heat dissipation from the bus bar.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the bus bar is extended outside the case with a simple configuration, then the heat dissipation is improved, but the structural support and stability are insufficient
Solution Approach 1:
The bus bar is divided into multiple segments: an extension part extending outside the case for heat dissipation, and a connection part inside the case for structural support. The supporting part is segmented into multiple supporting portions that contact different surfaces of the extension part, providing distributed structural support while maintaining heat dissipation effectiveness.
2Temperature
If the bus bar is extended outside the case to improve heat dissipation, then the temperature control is improved, but the device complexity increases
Solution Approach 1:
The bus bar integrates multiple functions into a single component: it serves as both the electrical connection element and the heat dissipation structure. The extension part of the bus bar simultaneously provides structural support through contact with supporting portions and dissipates heat to the external environment, eliminating the need for separate support structures.
3Temperature
If a thicker outer bus bar is used to improve thermal conductivity, then the heat dissipation efficiency is improved, but the manufacturing cost and device complexity increase
Solution Approach 1:
The bus bar features non-uniform thickness distribution optimized for local functional requirements. The outer bus bar has increased thickness in regions requiring higher thermal conductivity for heat dissipation, while maintaining appropriate thickness in other regions. This localized quality variation achieves improved thermal performance without uniformly increasing overall 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
This configuration effectively suppresses heat damage to the capacitor element by allowing for better dissipation of heat generated in the bus bar and external terminals, reducing the risk of damage and improving thermal conductivity.
Implementation Method 1
heat generated in external terminals and bus bars is not effectively dissipated
Implementation Method 2
heat generated in external terminals and bus bars is not effectively dissipated
Data Source
AI summary
A capacitor includes a capacitor element, an electrode disposed on an end face of the capacitor element, a bus bar connected to the electrode, and a case housing the capacitor element. The bus bar is extended from an opening of the case to outside the case. Outside the case, the bus bar includes an extension part and a connection terminal. The extension part extends in a first direction along a side face of the case. The connection terminal is connected to the extension part. Further, the case includes a supporting part disposed on the side face of the case. The supporting part supports the bus bar to form a space between the side face and the extension part.