Battery Module Redundant Detection for Communication Failure
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Solution Overview
Problem
The reliability of battery systems in electric vehicles and movable bodies is compromised due to the inability to detect and prevent overcharge or overdischarge when defects occur in the communication path between simplified cell overcharge/overdischarge detection devices and the battery controller, leading to potential battery damage and reduced system reliability.
Innovation Solution
A battery system configuration that includes multiple battery modules with integrated voltage detectors, state detectors, and cell-voltage-balancing circuits, where detection signals can be sent through redundant communication paths to ensure that abnormalities are detected and communicated to the battery ECU even if defects occur in individual components, preventing overcharge or overdischarge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a simplified cell overcharge/overdischarge detection device is used with a single communication path to the battery controller, then the device complexity is reduced and cost is lowered, but the reliability decreases because a defect in the communication path prevents detection results from being sent to the battery controller
Solution Approach 1:
The battery system is divided into multiple battery modules, each with its own independent detection device. Each detection device can independently detect overcharge/overdischarge conditions in its corresponding battery cell group and communicate results through separate communication paths to the battery controller, ensuring that a defect in one module's communication path does not affect other modules
Solution Approach 2:
The system changes the communication architecture from a single shared communication path to multiple independent communication paths. Each detection device has its own dedicated communication line to the battery controller, transforming the system from a single-point-failure configuration to a redundant configuration where communication reliability is maintained even if one path fails
2Reliability
If redundant communication paths are provided for each detection device to improve reliability, then the detection reliability is improved, but the device complexity and cost increase
Solution Approach 1:
The battery system is segmented into multiple independent battery modules, where each module's detection device communicates through its own dedicated path. This segmentation provides functional redundancy without requiring complex dual-path routing within each module, as each module operates independently with its own communication infrastructure
Solution Approach 2:
The battery controller serves multiple functions: it receives detection results from multiple detection devices through multiple communication paths, processes information from all modules centrally, and coordinates the overall battery system operation. This multi-functional design allows the controller to handle redundant information efficiently without proportionally increasing system complexity
Data Source
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AI summary
One state detector detects an abnormal state or a normal state relating to charge and discharge of a battery cell group in one battery module, and generates one detection signal representing the detected state. Another state detector detects an abnormal state or a normal state relating to charge and discharge of another battery cell group in another battery module, and generates another detection signal representing the detected state. One operation processing device sends the one detection signal generated by the one state detector to an external object. Another operation processing device sends the other detection signal generated by the other state detector to the external object. The one detection signal generated by the one state detector is transmitted to at least one of the other operation processing device and the other state detector via a signal line.