Battery Management System Slave Controller Loopback Diagnosis
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Solution Overview
Problem
Battery management systems face challenges in detecting failures in voltage-detecting ICs and communication routes due to external noise or physical pressure, making it difficult to identify the defective component within the system.
Innovation Solution
The proposed solution involves a battery management system with slave controllers equipped with first and second receivers and transmitters, allowing for diagnosis packets to form loopback routes and transmit error checking packets, enabling the master controller to determine defects in individual slave controllers or communication routes, facilitating quick identification and potential repair of failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If AFE ICs are connected in series by daisy chain method, then communication between controllers is achieved, but the system becomes vulnerable to noise and physical pressure damage
Solution Approach 1:
The patent divides the communication system into multiple independent segments by adding alternative communication paths. Instead of a single daisy-chain connection, each AFE IC can communicate through multiple routes, isolating the impact of damage to any single segment and maintaining overall system reliability.
2Reliability
If a specific AFE IC or communication route is damaged, then communication failure occurs, but it is difficult to detect which component has failed
Solution Approach 1:
The patent implements a feedback mechanism where each AFE IC transmits its identification information through multiple communication routes to the master controller. By comparing the received identification information from different routes, the system can detect and locate failures automatically, providing continuous feedback about the health of each communication path.
3Reliability
If multiple communication routes are implemented for failure detection, then reliability improves, but device complexity increases
Solution Approach 1:
The patent makes the communication interfaces universal by equipping each AFE IC with both transmitter and receiver capabilities that can operate in multiple modes. The same hardware components serve both normal data communication and diagnostic functions, eliminating the need for separate dedicated test equipment and reducing overall system complexity despite enhanced functionality.
Data Source
AI summary
A battery management system includes: a plurality of slave controllers configured to be respectively connected with a plurality of battery modules to generate battery sensing information related to the respective battery modules; and a master controller connected with an uppermost slave controller from among the slave controllers, wherein each of the slave controllers includes a first receiver and a first transmitter configured to communicate with a preceding slave controller or the master controller and a second receiver and a second transmitter configured to communicate with a following slave controller, and each of the slave controllers is configured to connect the first receiver with the first transmitter or the second receiver with the second transmitter depending on types of diagnosis packets inputted through the first receiver.