Battery Management System Cross-Comparison Protection
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Solution Overview
Problem
Conventional battery management systems frequently activate and deactivate safety protection functions due to noise interference, leading to false operations and potential sudden loss of electricity in electric vehicles, lacking comprehensive signal cross-comparison and precise measurement functions.
Innovation Solution
A battery management system that includes a power supply module, measurement module, switch module, and processing module, which cross-compares operation signals like voltage, current, and temperature to accurately determine the power supply status and activates safety protection items only when necessary, providing both global and local protection processes with buffer times and precise measurement functions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional battery management systems activate protection functions based on single signal threshold comparison, then the system responds quickly to potential dangers, but the system frequently activates and deactivates protection functions due to noise interference causing false operations
Solution Approach 1:
The protection activation process is segmented into multiple independent comparison stages: first comparing the first operation signal with its threshold, then comparing the second operation signal with its threshold, and only activating protection when both comparisons indicate danger. This segmentation of the decision-making process prevents false activations caused by noise in a single signal channel.
Solution Approach 2:
The patent introduces an intermediary verification mechanism where a second operation signal acts as a mediator to confirm the danger indication from the first operation signal. This intermediary comparison serves as a validation step that filters out false alarms while maintaining rapid response capability through the buffer time mechanism.
2Reliability
If the battery management system activates protection function immediately when threshold is exceeded, then the system provides rapid protection, but the system causes sudden power loss that may interrupt critical operations
Solution Approach 1:
The system performs preliminary verification by comparing multiple operation signals before activating protection, and introduces a buffer time period that allows for final confirmation. This preliminary action ensures that protection is only activated when truly necessary, preventing premature interruptions of power supply while maintaining safety.
Solution Approach 2:
The buffer time mechanism serves as a cushioning period between detecting a threshold violation and actually activating protection. This cushioning allows the system to confirm the validity of the danger signal and provides an opportunity to maintain power supply continuity if the alarm is false, thereby avoiding sudden power loss.
3Reliability
If the battery management system uses multiple operation signals for cross comparison, then the system reduces false operations, but the system increases measurement and processing requirements
Solution Approach 1:
The patent employs multiple operation signals (voltage, current, temperature) that serve dual purposes: each signal independently monitors its own parameter while collectively they provide cross-validation for protection activation. This multi-functionality approach reduces false operations through mutual verification without requiring specialized high-precision measurement systems for each individual signal.
Data Source
AI summary
A battery management system is provided, which may include a power supply module, a measurement module, a switch module and a processing module. The power supply module may be electrically coupled to a load or a charging power source via the switch module. The measurement module may measure a plurality of operation signals from the power supply module. The processing module may determine the operation status of the power supply module by cross comparison between the operation signals, and activate a safety protection item according to the operations signals and the operation status; the processing module may determine to activate a global protection process to turn off the switch module or activate a local protection process to turn off the switch module after a buffer time according to the danger level of the safety protection item.