Battery State Estimation During BMS Communication Loss
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Solution Overview
Problem
Energy storage systems with lithium iron phosphate batteries face operational disruptions when a loss of communication occurs in a specific battery assembly, requiring system shutdown for maintenance, which is inefficient and time-consuming.
Innovation Solution
A battery control apparatus that uses state information from parallel batteries to estimate and monitor the state of a non-communicating battery, allowing the system to continue operating without interruption by selecting reference batteries based on historical data and similarity calculations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the system stops operation to maintain battery assemblies with loss of communication, then communication reliability is improved, but system productivity deteriorates
Solution Approach 1:
The patent creates a virtual copy of the lost battery assembly data by estimating its state information based on data from other battery assemblies. The upper control device generates estimated state information (such as temperature, voltage, current) for the battery assembly that lost communication, using actual data from other assemblies. This allows the system to continue operating without stopping, while maintaining data integrity for control purposes.
Solution Approach 2:
The patent performs preliminary estimation of battery assembly state information before communication is fully lost or immediately after loss of communication occurs. By having the upper control device ready to estimate and generate state information using data from other battery assemblies, the system can maintain continuous operation without interruption, thus preserving productivity while ensuring reliability.
2Reliability
If the system stops operation for maintenance of non-communicating battery assemblies, then system reliability is improved, but loss of time increases
Solution Approach 1:
The patent creates a virtual copy of the lost battery assembly data by estimating its state information based on data from other battery assemblies. The upper control device generates estimated state information (such as temperature, voltage, current) for the battery assembly that lost communication, using actual data from other assemblies. This allows the system to continue operating without stopping, while maintaining data integrity for control purposes.
Solution Approach 2:
The patent ensures continuous operation of the energy storage system by implementing real-time estimation of battery assembly state information even when communication is lost. The upper control device continuously generates estimated data using information from other battery assemblies, allowing the system to maintain uninterrupted operation and avoid downtime for maintenance, thus achieving continuous useful action.
3Manufacturing precision
If battery assemblies are fully charged or discharged to connect in parallel, then manufacturing precision is improved, but loss of time increases
Solution Approach 1:
The patent replaces the traditional mechanical/electrical approach of fully charging or discharging battery assemblies to match SOC levels with an information-based estimation approach. The upper control device estimates the state information of battery assemblies with loss of communication using data from other assemblies, eliminating the need for time-consuming full charge/discharge cycles to achieve parallel connection readiness.
Data Source
AI summary
An energy storage system may include a plurality of battery management systems (BMSs) provided in correspondence to a plurality of batteries, respectively; and an upper control apparatus for collecting state information on the plurality of batteries from the plurality of BMSs and for monitoring and controlling the plurality of batteries based on the collected state information. Here, the upper control apparatus may upon the state information of a first battery being not received from a first BMS due to a loss of communication, select one or more second batteries among batteries connected in parallel with the first battery based on previously stored history information of batteries and estimate state information of the first battery based on the state information of the one or more second batteries.