Battery Pack Relay State Diagnosis in Parallel Aircraft Packs
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Solution Overview
Problem
Conventional methods struggle to accurately diagnose whether a relay in a parallel battery pack of an aircraft is open or closed due to the connection characteristics of the battery pack, which can lead to difficulties in determining the status of individual battery packs connected in parallel.
Innovation Solution
A battery pack diagnosis control apparatus and method that measures current flowing from the battery pack to a diagnosis circuit, determining if it exceeds a predetermined threshold to diagnose relay status, allowing for accurate determination of faulty battery packs and notification of flight control systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If voltage difference method is used to diagnose relay status, then the diagnosis method is simple, but the diagnosis accuracy deteriorates due to parallel battery pack connection characteristics
Solution Approach 1:
The patent replaces the conventional voltage-based diagnosis method with a current-based diagnosis method. Specifically, it substitutes the measurement principle from voltage difference detection to current flow detection through the relay, enabling accurate relay status determination in parallel battery pack configurations where voltage methods fail
Solution Approach 2:
The patent changes the diagnostic parameter from voltage to current. By measuring the current flowing through the relay during a test discharge phase and comparing it against threshold values, the system can accurately determine relay status (open/closed) even in parallel battery pack configurations where voltage difference methods are ineffective
2Reliability
If parallel battery pack configuration is used, then the system reliability is improved, but the difficulty of detecting and measuring individual pack status deteriorates
Solution Approach 1:
The patent segments the diagnosis process into distinct phases: a test discharge phase where individual battery pack currents are measured separately, and a normal operation phase. During the test phase, the system isolates and measures current from each parallel-connected battery pack individually, enabling accurate status determination of each pack while maintaining the reliability benefits of parallel configuration
Solution Approach 2:
The patent implements a preliminary test discharge phase before normal flight operations to diagnose battery pack and relay status. This preliminary action allows the system to measure individual pack currents when conditions are controlled, determining relay status and battery health before the packs are connected in parallel for flight, thus enabling accurate detection without compromising system reliability
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
Enables accurate diagnosis of faulty battery packs in parallel configurations, ensuring safe flight operations by reliably determining relay states and controlling relays accordingly.
Implementation Method 1
measure a current flowing from the battery pack to the diagnosis circuit
Data Source
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AI summary
The present disclosure relates to a battery pack diagnosis control apparatus, a battery system including the same, and a method thereof. An exemplary embodiment of the present disclosure provides a battery system including: at least one battery pack; a flight control apparatus configured to transmit at least one of a battery discharge mode command or a motor discharge command; a battery control apparatus configured to transmit a relay control command for a relay based on receiving the battery discharge mode command, and transmit a diagnosis command based on receiving the motor discharge command; and at least one battery pack control apparatus configured to control the relay based on receiving the relay control command, and diagnose a failure of the at least one battery pack by measuring a current of the at least one battery pack based on receiving the diagnosis command.