Insulation Monitoring Circuit Fault Detection in Battery Packs
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Solution Overview
Problem
Existing insulation monitoring modules in electric vehicles are prone to faults, leading to inaccurate insulation resistance monitoring and potential electrical leakage, which compromises safety due to component aging or deviation.
Innovation Solution
A method for monitoring an insulation monitoring circuit within a battery management system, utilizing additional monitoring modules and voltage divider units to detect electrical signals and determine circuit faults, thereby reducing the risk of inaccurate insulation resistance calculations and improving safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple monitoring modules and voltage divider units are added to detect circuit faults, then fault detection capability is improved, but device complexity increases
Solution Approach 1:
The control module serves multiple functions: it controls the switching modules, samples electrical signals from voltage divider modules, analyzes the sampled signals to detect faults, and generates control signals based on fault detection results. By making the control module multi-functional, the patent avoids adding separate dedicated components for each function, thereby improving fault detection capability while limiting the increase in overall device complexity.
Solution Approach 2:
The patent combines the control functions, switching control, signal sampling, and fault analysis into an integrated control module. The switching modules control multiple voltage divider units, and the sampling module consolidates signal acquisition from multiple sources. This merging of functions into shared components achieves comprehensive fault detection without proportionally increasing system complexity.
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
The method effectively detects faults in the insulation monitoring circuit, reducing the risk of electric shocks and enhancing the safety performance of electric vehicles by ensuring accurate insulation resistance monitoring.
Implementation Method 1
The first voltage divider module includes a first voltage divider unit, a second voltage divider unit, and a first switch, and the first voltage divider unit, the second voltage divider unit, and the first switch are connected in series
Data Source
AI summary
Embodiments of this application relate to the monitoring field, and disclose a method for monitoring an insulation monitoring circuit and a battery management system. In some embodiments of this application, the method for monitoring an insulation monitoring circuit includes: in a state in which a first switch and a second switch are closed and a third switch is open, obtaining a first electrical signal detected by a second monitoring module; and based on the first electrical signal and a voltage reference value between a positive electrode of a battery pack and a negative electrode of the battery pack, determining whether an insulation monitoring circuit is faulty; or obtaining a second electrical signal detected by a first monitoring module and a third electrical signal detected by a third monitoring module, and based on the second electrical signal and the third electrical signal, determining whether the insulation monitoring circuit is faulty.