Wireless Battery Management System ID Allocation
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Solution Overview
Problem
Existing battery management systems for electric vehicles face challenges in efficiently allocating IDs to slave BMSs due to wired connections, which are prone to disconnection and spatial limitations, and require measuring potential differences between batteries.
Innovation Solution
A wireless battery management system that uses a master BMS to transmit a trigger signal to slave BMSs, which respond with a temporary ID, allowing the master BMS to determine formal IDs based on signal strength, eliminating the need for wired connections and potential difference measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wired connection is used for ID allocation between master BMS and slave BMSs, then stable connection is achieved, but spatial flexibility is limited and wire disconnection risk exists
Solution Approach 1:
The patent replaces the mechanical wired connection system with a wireless electromagnetic communication system. The master BMS and slave BMSs communicate ID allocation data and battery state information through wireless signals, eliminating physical cables and connectors. This substitution resolves the contradiction by providing both connection reliability (through stable wireless communication protocols) and spatial flexibility (by removing physical connection constraints).
Solution Approach 2:
The patent introduces wireless communication signals as an intermediary medium between the master BMS and slave BMSs. Instead of direct wired connections, the system uses electromagnetic waves transmitted and received by antennas on each BMS unit. This intermediary enables flexible spatial arrangement while maintaining reliable data transmission for ID allocation and battery monitoring.
2Loss of information
If wired connection is used for ID allocation, then direct communication is achieved, but measurement of potential difference between batteries is required in advance
Solution Approach 1:
The patent replaces the electrical measurement system (voltmeter/potential difference measurement) with a wireless communication system. Each slave BMS transmits its identity and battery state information directly to the master BMS through wireless signals, eliminating the need for external potential difference measurements. The master BMS receives and processes this information directly, maintaining communication directness while removing measurement complexity.
3Adaptability or versatility
If wireless communication is used for ID allocation, then spatial flexibility is improved and wire disconnection risk is eliminated, but signal strength-based ID determination complexity increases
Solution Approach 1:
The patent implements a feedback mechanism where the master BMS transmits a trigger signal to slave BMSs, and slave BMSs respond by transmitting their temporary IDs back to the master. The master BMS measures the signal strength of these responses and uses this feedback information to determine which slave BMS corresponds to which battery module. This feedback loop enables automatic ID allocation based on spatial position without complex manual configuration.
Solution Approach 2:
The system enables slave BMSs to self-identify and self-allocate IDs automatically. Each slave BMS transmits its temporary ID in response to the master's trigger signal, and the master BMS automatically determines formal IDs based on signal strength measurements. This self-service mechanism eliminates the need for manual ID assignment or complex external measurement procedures, reducing overall system complexity despite the wireless communication requirements.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables efficient and cable-free ID allocation, reducing the risk of disconnection and improving spatial utilization by determining IDs based on signal strength, thereby enhancing ID allocation efficiency.
Implementation Method 1
a master BMS including a first master antenna, and configured to wirelessly transmit a trigger signal to the plurality of slave BMSs
Implementation Method 2
determine a formal ID to be allocated to each slave BMS based on a received signal strength of the response signal received through the first master antenna
Data Source
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AI summary
Disclosed are a wireless battery management system and a battery pack including the same. The wireless battery management system includes a plurality of slave BMSs coupled to a plurality of battery modules installed one-to-one correspondence, each of the plurality of slave BMSs includes a slave antenna, and a master BMS including a first master antenna, and configured to wirelessly transmit a trigger signal to the plurality of slave BMSs, the trigger signal for ID allocation to the plurality of slave BMSs. Each slave BMS is configured to generate a response signal including a temporary ID allocated to itself in response to the trigger signal, and wirelessly transmit the response signal to the master BMS. The master BMS is configured to receive the response signal from each of the plurality of slave BMSs through the first master antenna, and determine a formal ID to be allocated to each slave BMS based on a received signal strength of the response signal received through the first master antenna.