Power Switch Segmentation for Battery Communication
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Solution Overview
Problem
Current Li-ion battery systems for electric and hybrid vehicles face challenges in optimizing switching characteristics for high currents and communication signal transmission, requiring efficient data communication between battery cells or modules and the central control unit, while also ensuring safety and energy efficiency.
Innovation Solution
A power switch with a power section and a communication section, utilizing semiconductor switches to differentiate between power switching signals and communication signals through low-pass and high-pass filters, allowing for optimized switching of high currents and high-frequency signal transmission, respectively, with a control device to manage these signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single power switch is used for both high current switching and communication signal transmission, then device complexity is reduced, but switching characteristics cannot be optimized for both functions simultaneously
Solution Approach 1:
The power switch is divided into two independent sections: a power section with first switches for high current switching and a communication section with second switches for signal transmission. Each section can be independently optimized for its specific function, resolving the contradiction between device simplicity and functional optimization.
Solution Approach 2:
Different parts of the power switch have different characteristics tailored to their specific functions. The power section uses switches optimized for high current handling while the communication section uses switches optimized for signal transmission, allowing each local region to have the quality needed for its purpose.
2Reliability
If DC isolated wiring is used for data communication, then communication reliability is maintained, but energy efficiency and performance are limited
Solution Approach 1:
The power switch integrates both power switching and communication functions into a single device, combining the previously separate power transmission and data communication pathways. This merging enables powerline communication that is more energy-efficient while maintaining reliability through the dedicated communication section.
Solution Approach 2:
The power switch becomes a multi-functional device that simultaneously handles high current switching and communication signal transmission. This universal device replaces the need for separate DC isolated wiring for communication, improving energy efficiency while maintaining communication reliability.
3Ease of manufacture
If the same switch is used for both power switching and communication, then manufacturing cost is reduced, but switching response optimization for both low-frequency and high-frequency signals cannot be achieved
Solution Approach 1:
The switch device is segmented into power switches and communication switches that can be manufactured using different optimization criteria. The power switches are optimized for low-frequency high-current switching while communication switches are optimized for high-frequency signal response, allowing each to achieve optimal switching characteristics for its frequency range.
Solution Approach 2:
Different switching elements have different local characteristics optimized for their specific frequency ranges. The power section uses switches with characteristics suited for low-frequency operation while the communication section uses switches optimized for high-frequency response, enabling optimal performance across both frequency domains.
Data Source
AI summary
The invention relates to a power switch (100) for a battery system. The power switch (100) comprises: a first terminal (104); a second terminal (106); a control terminal (102) for receiving a control signal (108); a device (112) for identifying a power switching signal (114) and a communication signal (116) based on the control signal (108); a power section (118) comprising at least one switch (122) for switching an electrical connection between the first terminal (104) and the second terminal (106) based on the power switching signal (114); and a communication section (120) comprising at least one switch (124) for switching the electrical connection between the first terminal (104) and the second terminal (106) based on the communication signal (116).