Single-Antenna Battery BMS Layout for Uniform Wireless Links
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Solution Overview
Problem
In a 1:many wireless communication environment between a master BMS and slave BMSs, the varying distances and installation positions cause deviations in wireless communication performance due to changes in resonant frequencies, leading to inconsistent communication quality.
Innovation Solution
A battery system with a single antenna and integrated distributor for slave BMSs, using a frequency hopping method with a designated ISM bandwidth, and connectors of equal length to ensure synchronized communication across all slave BMSs, reducing performance deviations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If individual antennas are connected to each slave BMS node, then wireless communication can be performed at each node, but wireless communication performance deviates due to different distances and structural influences
Solution Approach 1:
Multiple individual antennas connected to different slave BMS nodes are merged into a single shared antenna. The slave BMS nodes transmit sensing signals through wired connections to the integrated distributor, which then transmits them through the single antenna to the master BMS, eliminating performance deviations caused by varying distances and structural influences on individual antennas
Solution Approach 2:
An integrated distributor is introduced as an intermediary component between the slave BMS nodes and the single antenna. The distributor receives sensing signals from multiple slave BMS nodes through wired connections and transmits them through the single antenna, acting as a mediator that ensures consistent signal transmission quality for all nodes
2Adaptability or versatility
If frequency hopping method is used for wireless communication, then communication bandwidth is increased, but resonant frequency changes cause additional performance deviation
Solution Approach 1:
The system uses a single shared antenna for frequency hopping communication instead of individual antennas at each slave node. This merging approach ensures that all slave BMS nodes experience the same resonant frequency characteristics and structural influences, eliminating performance deviations even when using frequency hopping across different channels
3Productivity
If slave BMSs are installed at different positions in the battery pack, then comprehensive battery monitoring is achieved, but distance variations cause wireless communication performance deviation
Solution Approach 1:
The system segments the communication path into two parts: wired connections from slave BMS nodes to the integrated distributor, and wireless transmission from the single antenna to the master BMS. This segmentation allows slave BMSs to be installed at different positions for comprehensive monitoring while the centralized antenna ensures uniform wireless communication performance
Solution Approach 2:
The integrated distributor acts as a mediator that collects signals from slave BMSs at various positions through wired connections and transmits them uniformly through a single antenna, decoupling the position-dependent wired connections from the wireless transmission quality
Data Source
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AI summary
The present disclosure relates to a battery system with identical wireless communication performance, and the battery system for performing wireless communication using a frequency hopping method according to an embodiment includes: battery modules; a single antenna; slave BMSs connected to the battery modules, generating battery information by sensing states of the battery modules, and providing sensing signals including the battery information to the single antenna; and a master BMS connected to an antenna, receiving the sensing signals transmitted through the single antenna through the antenna, obtaining the battery information according to the sensing signals, generating control signals for controlling the battery modules by using the obtained battery information, and transmitting the control signals to the single antenna through the antenna.