BLE Battery Module Grouping for Faster Connection Startup
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Solution Overview
Problem
In large-scale storage battery systems using Bluetooth Low Energy (BLE) for wireless communication, the high probability of advertising packet collisions leads to connection failures and prolonged system startup times due to the random timing of transmission attempts by multiple modules, and the limited capacity of BLE System on Chip (SoC) for managing numerous slave devices.
Innovation Solution
The storage battery system employs a multi-master configuration with grouped wireless communication modules, where each group responds to specific identifiers in advertising packets, reducing collisions and improving connection success rates by transmitting packets in units rather than randomly, and allows for efficient identifier changes to maintain system operation without prolonged shutdowns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple storage battery modules transmit advertising packets simultaneously using random timing in BLE, then wireless communication can be established, but advertising packet collisions occur with high probability leading to connection failures
Solution Approach 1:
The patent segments the large number of storage battery modules into multiple groups, with each group assigned to a different master device. This segmentation reduces the number of slave devices each master needs to manage simultaneously, thereby reducing advertising packet collisions and improving connection success rates during system startup.
Solution Approach 2:
The patent implements dynamic group assignment where storage battery modules can be switched between different groups based on communication needs. This dynamic reconfiguration allows the system to optimize connection establishment by distributing modules across multiple master devices, reducing collision probability and improving reliability.
2Adaptability or versatility
If a single master device manages all storage battery modules, then system configuration is simple, but the BLE SoC has limitations on the number of connected slave devices
Solution Approach 1:
The patent merges multiple master devices into a coordinated multi-master system, where each master manages a subset of slave devices. This combination allows the system to overcome the BLE SoC limitation on the number of connected slave devices by distributing the management load across multiple masters, thereby increasing the total number of manageable modules.
Solution Approach 2:
The patent makes master devices universal by enabling any storage battery module to potentially function as a master device. This multi-functionality allows the system to flexibly assign master roles based on communication needs, improving adaptability while maintaining manageable system complexity through standardized master-slave protocols.
3Ease of operation
If wireless communication is implemented without wiring, then configuration is simplified and wiring disruption risk is reduced, but energy consumption in monitoring circuit and communication module increases
Solution Approach 1:
The patent implements periodic communication cycles where storage battery modules transmit their status information at predetermined intervals rather than continuously. This periodic action significantly reduces energy consumption in the monitoring circuit and communication module while maintaining effective wireless communication for battery management.
Solution Approach 2:
The patent enables storage battery modules to autonomously manage their own communication activities, including self-identification, self-grouping, and self-scheduling of status transmissions. This self-service approach minimizes the need for continuous master device polling, thereby reducing overall system energy consumption while maintaining simplified wireless configuration.
Data Source
AI summary
A system according to an embodiment includes storage battery modules, each comprising an assembled battery, a first wireless communication module to transmit and receive radio waves based on a BLE standard, and a battery monitoring unit configured to control operation of the first wireless communication module; and a battery management unit comprising second wireless communication modules to transmit and receive radio waves based on the BLE standard and an arithmetic processing device, wherein a first identifier is preset in the first wireless communication module, and when a connection is started, the first wireless communication module in which a value of a second identifier included in an advertising packet transmitted from the second wireless communication module is a value of the first identifier becomes a broadcaster and transmits the advertising packet.