Battery Management System Backup BMU Frequency Recovery
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Solution Overview
Problem
The existing battery management system experiences unreliable communication due to factors like structural layout and interference signals, leading to abnormal communication or communication interruptions between the main battery management unit (BMU) and managed units.
Innovation Solution
A communication method and system that includes a main BMU and a backup BMU, where the main BMU determines faulty units and transmits fault frequencies to the backup BMU, which selects a target unit to transmit frequency conversion information to the faulty unit, allowing it to change its communication frequency, enabling the backup BMU to communicate with the faulty unit and then the main BMU, thereby recovering communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the main BMU communicates directly with all managed units, then communication coverage is complete, but communication reliability deteriorates due to interference signals and structural layout issues
Solution Approach 1:
The patent introduces a backup BMU as an intermediary to establish alternative communication paths. When the main BMU experiences communication failures with certain managed units due to interference or structural issues, the backup BMU acts as a mediator to relay commands and data between the main BMU and the affected managed units, thereby maintaining communication reliability without requiring direct line-of-sight between all components.
2Reliability
If frequency conversion is performed to resolve communication abnormalities, then communication reliability improves, but system complexity increases due to frequency management requirements
Solution Approach 1:
The patent implements frequency conversion as a parameter change mechanism to resolve communication abnormalities. The system dynamically adjusts the communication frequency between the backup BMU and managed units based on detected interference conditions or communication failures. This allows the system to switch to alternative frequencies that avoid interference signals and multipath fading effects, thereby improving reliability while keeping the complexity manageable through automated frequency selection algorithms.
3Reliability
If a backup BMU is introduced to handle communication failures, then communication reliability improves, but device complexity increases due to additional hardware components
Solution Approach 1:
The patent employs a backup BMU that is essentially a copy of the main BMU's communication functionality. This copied unit can assume the communication role when the main BMU fails or experiences interference issues. The backup BMU maintains the same operational capabilities and interface protocols, allowing for seamless takeover and ensuring system reliability without requiring fundamentally different or overly complex additional hardware.
Data Source
AI summary
The present disclosure provides a battery management system and a communication method. The method includes: determining, by a main BMU, from a plurality of managed units a fault unit that communicates abnormally with the main BMU, and transmitting, by the main BMU, to a backup BMU a fault frequency at which the fault unit communicates abnormally with the main BMU; selecting, by the backup BMU, from the managed units a managed unit that communicates normally with the backup BMU and the fault unit as a target unit; transmitting, by the backup BMU, frequency-conversion information to the fault unit through the target unit based on the fault frequency; converting, by the fault unit, its frequency to a frequency; transmitting the frequency to the main BMU if the backup BMU communicates normally with the fault unit using the frequency; and communicating, by the main BMU, with the fault unit using the frequency.