Wireless Battery Node Relay for Lighter Vehicle BMS
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Solution Overview
Problem
Modern vehicles face inefficiencies and weight increases due to wired battery management systems, which hinder vehicle performance and complicate battery cell replacement.
Innovation Solution
A wireless battery management system utilizing primary and secondary network nodes that communicate using a common frame format, enabling wireless RF communication between the primary network node and secondary network nodes, allowing for secure and efficient data exchange and management of battery cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a wired battery management system is used, then reliable communication between network nodes is achieved, but vehicle weight increases and system complexity increases
Solution Approach 1:
The patent replaces the mechanical wired connection system with a wireless RF communication system. The battery controller and battery cells communicate through wireless frames containing data fields for cell information, eliminating physical cables and connectors while maintaining communication reliability through protocol-level error checking and acknowledgment mechanisms.
2Stability of the object's composition
If a wired battery management system is used, then stable data transmission is achieved, but ease of battery cell replacement deteriorates
Solution Approach 1:
The wireless communication system eliminates mechanical connections that would need to be disconnected and reconnected during battery cell replacement. The RF communication allows for plug-and-play battery module installation without requiring cable management, significantly improving ease of replacement while maintaining data transmission stability through automatic connection establishment and authentication protocols.
3Ease of operation
If wireless RF communication is implemented, then vehicle weight is reduced and ease of operation improves, but communication security and reliability challenges arise
Solution Approach 1:
The patent introduces an authentication mechanism as an intermediary layer between the battery controller and battery cells. The authentication data field in communication frames verifies the identity and authorization of communicating parties, ensuring that only authenticated nodes can exchange data. This mediator layer protects against unauthorized access and data tampering while maintaining the ease of wireless operation.
Solution Approach 2:
The communication protocol implements acknowledgment feedback mechanisms where receiving nodes confirm successful frame reception and transmission nodes verify data integrity. This feedback loop ensures reliable communication by detecting and requesting retransmission of corrupted or lost frames, maintaining communication security and reliability despite the wireless medium's vulnerabilities.
Data Source
AI summary
A vehicular battery management system (BMS) comprises a battery controller, a set of battery cells, a primary network node coupled to the battery controller, and a secondary network node coupled to the set of battery cells. The primary and secondary network nodes are configured to wirelessly communicate with each other using frames that share a common frame format. The frame format includes one or more bits and a status of the one or more bits indicates whether the secondary network node is to communicate with the primary network node on behalf of another secondary network node.