Battery Module Wake-Up Synchronization for Low Sleep Current
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Solution Overview
Problem
The existing battery management systems face challenges in efficiently managing power consumption and wakeup times due to unpredictable wake-up signals from the master system, leading to increased current consumption and discharge risk of battery modules when parked.
Innovation Solution
A battery management system that synchronizes the reception period of slave systems by transmitting a request signal to the master system, allowing synchronized wake-up signal reception and reducing current consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the slave battery management system operates the receiver frequently to quickly recognize wake-up signals, then the wake-up time is reduced, but the current consumption of the battery module increases
Solution Approach 1:
The slave BMS performs preliminary actions by transmitting a request signal and entering a reception state before the master BMS actually transmits the wake-up signal. This allows the slave BMS to be ready to receive the signal immediately when transmitted, reducing wake-up time without requiring continuous receiver operation. The reception period is set to a specific duration (e.g., 10ms) starting from the request signal transmission, which is much shorter than continuous operation but sufficient to catch the wake-up signal.
2Reliability
If the receiver is operated frequently to detect wake-up signals, then the reliability of signal recognition is improved, but the battery module discharge risk increases when parked
Solution Approach 1:
The system implements periodic action by having the slave BMS enter a reception state at specific periodic intervals (when the master BMS is expected to transmit the wake-up signal) rather than continuously. The reception period is activated only during these specific intervals, reducing overall power consumption while maintaining reliable signal detection. The periodic reception is triggered by the transmission of request signals at predetermined intervals.
3Loss of time
If the slave battery management system wakes up periodically to check for signals, then the wake-up time is reduced, but the current consumption increases
Solution Approach 1:
The system applies dynamics by making the reception state temporary and conditional rather than continuous. The slave BMS dynamically transitions between sleep mode and reception state based on whether a request signal has been transmitted and whether the wake-up signal has been received. This dynamic state management allows the system to minimize power consumption while maintaining quick wake-up capability when needed.
Data Source
AI summary
A battery management system for a battery pack having a plurality of battery modules includes a master battery management system disposed in the battery pack and configured to transmit a wake-up signal, and slave battery management systems each configured to periodically check for the wake-up signal at a reception period and to transmit state information of a corresponding one of the battery modules to the master battery management system if the wake-up signal is received. A first slave battery management system, among the slave battery management systems, is configured to transmit a request signal to the master battery management system at a start of the reception period of the first slave battery management system. Based on the request signal, a second slave battery management system is configured to synchronize the reception period of the second slave battery management system with the reception period of the first slave battery management system.