Battery Module Identifier Assignment via Signal Line Counting
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Solution Overview
Problem
Existing battery systems for electric vehicles face challenges in ensuring communication reliability and easy identifier assignment for cell-overcharge-and-overdischarge detection devices, particularly when replacing faulty units, leading to issues with identification and communication with the controller.
Innovation Solution
A battery system with a control device and battery modules, each equipped with a voltage detection portion, abnormality detection portion, processing device, and selection portion, where identifiers are assigned through a specific communication protocol using signal lines, allowing the control device to manage and assign unique identifiers to each processing device, ensuring reliable communication and easy identifier assignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If identifiers are manually assigned to detection devices during production, then communication reliability is improved, but ease of repair deteriorates when devices need replacement
Solution Approach 1:
The detection device automatically assigns its own identifier by detecting the number of signal lines connected to it. When a device is replaced, it autonomously determines its new identifier based on the connection configuration without requiring manual intervention, thus maintaining communication reliability while greatly improving ease of repair
Solution Approach 2:
The identifier assignment is based on the physical parameter of signal line connections. The device counts the number of connected signal lines to determine its identifier, transforming a manual parameter assignment process into an automatic parameter-based assignment system
2Reliability
If a controller is added to manage identifier assignment, then communication reliability is improved, but device complexity increases
Solution Approach 1:
The identifier assignment function is extracted from the controller and implemented within the detection device itself. The device independently determines its identifier based on signal line connections, eliminating the need for a centralized controller to manage identifier assignment while maintaining communication reliability
Solution Approach 2:
The detection device performs self-identification by autonomously detecting the connection status of signal lines and assigning its own identifier, removing the need for external controller intervention and reducing overall system complexity
Data Source
AI summary
A battery ECU provides an N-th arithmetic processing device with an ID assignment signal. The N-th arithmetic processing device receives the ID assignment signal, and stores an ID that is transmitted by the battery ECU. The battery ECU provides an i-th arithmetic processing device (i is a natural number from N to 2) with a command for providing an ID assignment signal. The i-th arithmetic processing device provides the (i−1)-th arithmetic processing device with the ID assignment signal in response to the command for providing an ID assignment signal. The (i−1)-th arithmetic processing device receives the ID assignment signal, and stores an ID that is transmitted by the battery ECU.