High-Voltage Box Component Layout for BMS Heat and EMI Control
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Solution Overview
Problem
Existing high voltage boxes suffer from electromagnetic interference and heat-related issues due to the disorderly arrangement of electronic elements, particularly high-power fuses being near the battery management system, leading to potential aging and failure of the BMS.
Innovation Solution
The battery management system and fuses are arranged on opposite sides of the receiving space, with specific distances and configurations to minimize electromagnetic interference and heat impact, using copper plates and fans for heat dissipation, and separate wiring harnesses for improved safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If high-power fuses are arranged near the battery management system for compact layout, then space utilization is improved, but electromagnetic interference and heat impact on the BMS increase
Solution Approach 1:
The receiving space is divided into a first receiving space and a second receiving space, with the BMS located in the first receiving space and fuses located in the second receiving space. This spatial segmentation effectively separates components with different electromagnetic and thermal requirements, reducing interference while maintaining compact overall layout.
Solution Approach 2:
A partition plate is introduced as an intermediary structure between the BMS and fuses. The partition plate provides electromagnetic shielding and thermal isolation, acting as a mediator that allows both components to coexist in a compact arrangement while preventing harmful interactions.
2Ease of manufacture
If electronic elements are arranged disorderly for ease of installation, then installation complexity is reduced, but electromagnetic interference and heat generation affect BMS reliability
Solution Approach 1:
The receiving space is segmented into distinct regions with specific functional assignments. The first receiving space accommodates the BMS while the second receiving space accommodates high-power fuses. This segmentation provides a clear installation guideline that maintains reliability while simplifying the installation process.
Solution Approach 2:
Different regions of the receiving space are assigned different quality characteristics. The first receiving space is optimized for electromagnetic sensitivity (BMS location), while the second receiving space is optimized for heat dissipation (fuses location). This local quality differentiation ensures reliable operation while providing clear installation instructions.
3Volume of moving object
If fuses are placed close to BMS for compact design, then overall device size is reduced, but heat generated by fuses causes aging and failure of BMS elements
Solution Approach 1:
The receiving space is divided into thermally isolated segments. The BMS is located in the first receiving space away from heat-generating fuses in the second receiving space. This thermal segmentation maintains compact device size while preventing excessive temperature rise in the BMS.
Solution Approach 2:
The partition plate serves as a thermal mediator, providing thermal isolation between the BMS and fuses. This allows the device to maintain a compact form factor while preventing heat transfer from high-power fuses to the temperature-sensitive BMS.
Data Source
AI summary
A high voltage box includes: a box, a cover plate, and electrical elements received in a receiving space inside the box. A top of the box defines an opening, and the cover plate covers the opening of the box. The box includes a first side panel and a second side panel opposite to the first side panel; the receiving space is defined between the first side panel and the second side panel; the electrical elements include a battery management system, a positive-electrode fuse arranged on a positive-electrode circuit and/or a negative-electrode fuse arranged on a negative-electrode circuit. The battery management system is located on a side of the receiving space near the first side panel; the positive-electrode fuse and/or the negative-electrode fuse is located on another side of the receiving space near the second side panel.