Wireless Slave BMS Fault Isolation Using Transmission History
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Solution Overview
Problem
Current battery management systems struggle to accurately distinguish between communication errors and faults within slave battery management systems when data is not received, leading to inaccurate soundness determination.
Innovation Solution
A master battery management system that receives data and data transmission information from multiple slave BMSs, allowing it to identify errors and determine the cause, including communication errors, by using a receiving unit, determination unit, and noise measurement unit to assess the communication state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the master battery management system uses wireless communication to receive data from slave BMSs, then the system complexity is reduced and ease of operation is improved, but the reliability of determining whether a slave BMS is faulty deteriorates because communication errors cannot be distinguished from system faults
Solution Approach 1:
The patent introduces data transmission information as an intermediary element that mediates between the slave BMS data transmission and the master BMS determination process. This transmission information explicitly indicates whether data was successfully transmitted, allowing the master BMS to distinguish between communication failures and system faults without adding complex communication protocols
Solution Approach 2:
The patent implements a feedback mechanism where data transmission information is sent back from slave BMSs to the master BMS, providing feedback on the transmission status. This feedback loop enables the master BMS to accurately determine whether a slave BMS is faulty by comparing expected transmission status with actual transmission status
2Device complexity
If the master battery management system receives only data from slave BMSs without transmission status information, then the device complexity is minimized, but the measurement precision of determining slave BMS soundness deteriorates
Solution Approach 1:
The patent segments the data received from slave BMSs into two distinct parts: the actual BMS data and the data transmission information. This segmentation allows the master BMS to process and analyze transmission status separately from operational data, improving measurement precision without significantly increasing device complexity since both parts are received through the same communication channel
Data Source
AI summary
A master battery management system (BMS) used for a battery system in which a plurality of slave BMSs and the master BMS communicate wirelessly includes: a receiving unit configured to receive, from each slave BMS, data of the corresponding slave BMS and data transmission information of at least one other slave BMS except for the corresponding slave BMS among the plurality of slave BMS during one period in which each of the plurality of slave BMSs transmits data at least once; and a determination unit configured to determine a communication error or an abnormal slave BMS by using the data of the corresponding slave BMS and the at least one other slave BMS data received from each slave BMS during one period. The data transmission information of the at least one other slave BMS is information on a history that the other slave BMS transmits data.