Battery Pack Insulation Diagnosis for Parallel Failure Isolation
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Solution Overview
Problem
Accurate measurement of insulation resistance in parallel battery packs is hindered by impedance interference between circuits, making it difficult to diagnose battery failures in flight means.
Innovation Solution
A system comprising battery pack diagnosis apparatuses connected to each battery pack, which includes relay circuits and diagnosis circuits to control voltage and measure integrated insulation resistance, allowing for determination of failure states and positions by controlling relay states and measuring individual insulation resistances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If relay circuits are connected to the terminal for insulation resistance measurement, then the battery pack system can maintain reduced output for safe flight, but impedance interference between circuits prevents accurate measurement of insulation resistance
Solution Approach 1:
The patent divides the measurement system into separate segments: a first diagnosis apparatus measures insulation resistance of the first battery pack through a first relay circuit, while a second diagnosis apparatus measures insulation resistance of the second battery pack through a second relay circuit. By segmenting the measurement paths and using separate relay circuits for each battery pack, the patent eliminates impedance interference between parallel battery packs, enabling accurate individual measurement while maintaining system reliability.
2Reliability
If multiple battery packs are connected in parallel to maintain reduced output, then safe flight can be ensured, but it becomes difficult to accurately diagnose failure positions in individual battery packs
Solution Approach 1:
The patent implements separate diagnosis apparatuses for each battery pack in the parallel configuration. Each apparatus independently measures insulation resistance of its associated battery pack through dedicated relay circuits, enabling precise identification of which specific battery pack has failed while the other packs continue to operate and maintain reduced output for safe flight.
Solution Approach 2:
The patent introduces relay circuits as intermediary components between the battery packs and the diagnosis apparatuses. These relay circuits enable selective connection and disconnection of individual battery packs during measurement, allowing the system to isolate and diagnose specific failure positions without affecting the operation of other parallel battery packs.
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 precise identification of failed battery packs and their positions, preventing inaccurate resistance measurements and ensuring safe flight operations by identifying and isolating faulty batteries.
Implementation Method 1
measure a measured value of integrated insulation resistance of an inverter terminal of the flight means
Data Source
AI summary
A system for a vehicle may include a first battery pack diagnosis apparatus connected to a first battery pack, a second battery pack diagnosis apparatus connected to a second battery pack, a third battery pack diagnosis apparatus connected to a third battery pack, and a fourth battery pack diagnosis apparatus connected to a fourth battery pack. The first battery pack diagnosis apparatus may be configured to determine, based on a measured value of an integrated insulation resistance of an inverter terminal associated with the vehicle, whether a battery, of the first battery pack, the second battery pack, the third battery pack, or the fourth battery pack, is in a failure state, and based on a determination that the battery is in the failure state and based on individually measured insulation resistance of the first-fourth battery packs, determine a failure position of the battery.