eVTOL Battery Pack Fault Isolation With High-Voltage Disconnect
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Solution Overview
Problem
Electric vertical take-off and landing (eVTOL) aircraft technologies face challenges in energy source solutions, particularly in monitoring and managing battery health to prevent malfunctions and catastrophic failures.
Innovation Solution
A battery pack management system comprising a battery module, a module monitor unit, a pack monitoring unit, and a high voltage disconnect, which transmits measurement data, identifies critical operating conditions, and terminates power supply if conditions exceed predetermined thresholds to prevent damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a battery management system is implemented to monitor and manage battery health, then reliability is improved, but device complexity increases
Solution Approach 1:
The battery management system is segmented into multiple independent monitoring units, each responsible for specific parameters (voltage, temperature, current). Each unit operates autonomously to monitor its designated aspect, reducing interdependence and simplifying the overall system architecture while maintaining comprehensive monitoring coverage.
Solution Approach 2:
A microcontroller serves as an intermediary component that receives data from various sensor units, processes the information, and coordinates the response actions. This central intermediary simplifies the system by providing a single point of decision-making rather than requiring direct complex interactions between all monitoring components.
2Reliability
If real-time monitoring of battery conditions is implemented, then safety is improved, but energy consumption increases
Solution Approach 1:
The monitoring system operates periodically rather than continuously, with sensors taking measurements at predetermined time intervals. The microcontroller enters low-power states between measurement cycles, significantly reducing energy consumption while maintaining adequate safety monitoring through periodic updates of critical battery parameters.
Solution Approach 2:
The system uses passive sensing mechanisms where available battery voltage and temperature are measured without requiring additional active power consumption. The existing electrical connections and thermal fields are utilized for sensing purposes, minimizing extra energy requirements for the monitoring function.
3Reliability
If multiple sensors and monitoring units are added to prevent catastrophic failures, then reliability is improved, but manufacturing cost increases
Solution Approach 1:
The microcontroller unit performs multiple functions including data acquisition, processing, decision-making, and control of protective mechanisms. This multi-functional approach eliminates the need for separate dedicated circuits for each function, reducing component count and manufacturing complexity while maintaining comprehensive battery protection capabilities.
Solution Approach 2:
Multiple monitoring functions (voltage monitoring, temperature monitoring, current monitoring) are merged into a single integrated system managed by one microcontroller. This consolidation reduces the number of separate components needed and simplifies manufacturing processes while achieving comprehensive battery health monitoring and failure prevention.
Data Source
AI summary
An electric aircraft battery pack that includes an integrated battery management component, which determines if a power supply connection between the battery pack and the electric aircraft should be terminated due to a failure, defect, or malfunction of the battery pack, such as a failure of a battery module of the battery pack.