Battery BMS Relay Communication for Long Harness Signal Integrity
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Solution Overview
Problem
The communication wiring harness between the battery management unit (BMU) and battery monitoring unit (BMU) in vehicles with multiple battery casings is too long, leading to signal distortion and attenuation, which cannot be installed in the same area due to limited vehicle layout and dimensional differences.
Innovation Solution
A communication method involving a relay unit that enhances battery status and instruction information through filtering, amplification, and baud rate adjustment, connected to a shared communication network to extend the transmission distance and alleviate signal distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the communication wiring harness is extended to connect battery monitoring units and battery management unit in vehicles with multiple battery casings, then the system can accommodate the dimensional differences and layout constraints, but signal distortion and attenuation occur due to the excessive length
Solution Approach 1:
The patent divides the long communication wiring harness into multiple segments by introducing intermediate communication nodes (such as gateway devices or relay units) between the battery monitoring units and the battery management unit. Each segment has a controlled length that avoids signal distortion, while the intermediate nodes perform signal regeneration and protocol conversion to maintain communication reliability across the entire extended distance.
Solution Approach 2:
The patent introduces intermediary communication devices (gateway, relay units) that act as mediators in the communication path. These intermediaries receive signals from monitoring units, perform signal enhancement and processing, and forward them to the battery management unit, thereby solving the signal attenuation problem caused by long wiring harnesses while maintaining layout flexibility.
2Reliability
If the communication wiring harness length is reduced to improve signal quality, then signal distortion is reduced, but the battery monitoring units and battery management unit cannot be installed in separate areas due to vehicle layout constraints
Solution Approach 1:
The patent transitions from a direct physical connection approach to a multi-dimensional communication architecture. Instead of relying solely on physical proximity (one-dimensional constraint), the system uses intermediate communication nodes that can be strategically positioned in available vehicle spaces, effectively adding spatial dimensions to the communication topology and enabling flexible layout while maintaining signal quality.
Solution Approach 2:
By introducing intermediary communication devices, the patent decouples the physical distance constraint from communication reliability. These intermediaries enable long-distance communication without requiring the monitoring units and management unit to be in close proximity, thus achieving both signal quality and layout flexibility.
3Length of stationary object
If intermediate communication nodes are introduced to extend transmission distance, then signal attenuation is reduced, but the device complexity increases
Solution Approach 1:
The patent designs intermediate communication nodes with multi-functional capabilities, including signal amplification, protocol conversion, error correction, and diagnostic functions. By consolidating multiple functions into single intermediary devices, the system extends transmission distance while minimizing the increase in overall device complexity compared to having separate dedicated components for each function.
Solution Approach 2:
The patent employs parameter changes in the intermediate communication nodes, such as adjustable gain levels, configurable communication protocols, and adaptive signal processing parameters. This allows the system to optimize performance for different transmission distances and environmental conditions without requiring fundamentally different hardware architectures, thereby extending distance while controlling complexity.
Data Source
AI summary
A communication method for battery management system, a battery management system, an electronic device, and a medium. The communication method for battery management system includes receiving battery status information from a battery monitoring unit; performing enhancement processing on the battery status information to obtain enhanced battery status information; and transmitting the enhanced battery status information to a battery management unit, so that the battery management unit controls the operating condition of a battery based on the enhanced battery status information.