Master-Slave Battery Management Timer Synchronization
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Solution Overview
Problem
Existing battery management systems face challenges in efficiently managing a large number of battery cells in hybrid electric vehicles, particularly in synchronizing timers across master and slave systems to ensure precise timing and reliability, especially under external noise conditions.
Innovation Solution
A battery management system with a master-slave configuration where the master system generates synchronization start and reset signals to forcibly synchronize internal timers of slave systems, ensuring all timers operate in sync, even in the presence of external noise, thereby maintaining accurate voltage, current, and temperature measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a master-slave control system is used to manage a large number of battery cells, then the management capability is improved, but the complexity of synchronizing timers across multiple systems increases
Solution Approach 1:
The master battery management system acts as an intermediary that generates synchronization start signals and reset signals to coordinate the timers of all slave systems. This centralised control mechanism simplifies the synchronization process by providing a single source of timing reference that all slave systems must follow, thereby resolving the complexity of distributed timer coordination while maintaining enhanced battery cell management capability
Solution Approach 2:
The system implements feedback mechanisms where slave battery management systems monitor their timer status and communicate with the master system to maintain synchronization. The master system receives status information from slave systems and adjusts synchronization signals accordingly, ensuring that all timers remain coordinated even as the system scales to manage larger numbers of battery cells
2Reliability
If synchronization signals are transmitted between master and slave systems, then timer synchronization is improved, but the system becomes more vulnerable to external noise interference
Solution Approach 1:
The system applies preliminary anti-action by implementing noise filtering and shielding measures on synchronization signal transmission lines before external noise can interfere. The master and slave systems are designed with pre-established protection mechanisms that prevent noise from disrupting timer synchronization, thereby maintaining reliable synchronization while reducing vulnerability to external electromagnetic interference
Solution Approach 2:
The system incorporates error detection and correction capabilities in the synchronization signal transmission protocol. By beforehand cushioning against potential noise interference through redundant signaling and verification mechanisms, the system ensures that timer synchronization remains accurate even when external noise is present, thus improving reliability without proportionally increasing noise susceptibility
Data Source
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Figure 3
Figure 4A~4C
AI summary
A battery management system (900) includes at least one slave battery management system (900_S) and a master battery management system (900_M). The slave battery management system (900_S) outputs a ready signal (RD) when power is applied thereto, and the master battery management system (900_M) provides a synchronization start signal (ST) to the slave battery management system (900_S) in response to the ready signal (RD). The master battery management system (900_M) periodically provides a synchronization reset signal (SRT) to the slave battery management system (900_S).