Reconfigurable Battery EIS Using Integrated Switching Control
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Solution Overview
Problem
Conventional monitoring systems for reconfigurable batteries are costly and provide limited visibility into key battery cell parameters, making it difficult to effectively monitor the health and status of individual cells within reconfigurable battery systems.
Innovation Solution
A method and system that utilize integrated controllers to generate time-varying output currents with specific waveforms, measure corresponding voltages, and calculate impedance to enable electrochemical impedance spectroscopy (EIS) without external circuitry, allowing for precise monitoring of battery health and status by synchronizing voltage and current readings at specific frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional monitoring systems are used for reconfigurable batteries, then system simplicity is maintained, but measurement precision and visibility of key battery cell parameters deteriorate
Solution Approach 1:
The patent combines the monitoring functions and control functions into a single integrated controller, eliminating the need for separate external monitoring systems. This integration achieves comprehensive battery parameter monitoring while avoiding the complexity of multiple independent systems, directly resolving the contradiction between measurement precision and device complexity.
Solution Approach 2:
The integrated controller performs multiple functions including generating time-varying output currents for EIS analysis, measuring voltages, calculating impedance, and monitoring battery parameters. This multi-functionality eliminates the need for separate dedicated monitoring equipment, achieving high measurement precision without proportionally increasing system complexity.
2Measurement precision
If integrated controllers with EIS capability are implemented, then measurement precision of battery parameters improves, but device complexity increases
Solution Approach 1:
The integrated controller utilizes the battery system's own existing components (switching devices, current paths) to perform EIS measurements and parameter monitoring. By making the system monitor itself using its inherent capabilities rather than requiring entirely separate dedicated monitoring equipment, the patent achieves high measurement precision while minimizing the addition of external complex components.
3Measurement precision
If external circuitry is added for EIS measurements, then measurement precision improves, but ease of operation and system simplicity deteriorate
Solution Approach 1:
The patent merges the EIS measurement functionality with the existing integrated controller and battery management infrastructure. By combining these functions rather than adding separate external EIS measurement circuitry, the system achieves accurate impedance measurements while maintaining operational simplicity and avoiding additional configuration complexity.
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
This approach enables cost-effective and comprehensive monitoring of battery health and status, improving diagnostics and performance by providing detailed insights into temperature, state of charge, and state of health of battery cells within reconfigurable battery systems.
Implementation Method 1
transmitting, from an integrated controller to one or more switching devices associated with one or more battery cells, one or more signals to generate a time-varying output current having a waveform
Implementation Method 2
measuring a time-varying voltage in response to the time-varying output current being applied to a load, and calculating an impedance based on the time-varying output current and the time-varying voltage at the frequency
Data Source
AI summary
Aspects of the present disclosure include a reconfigurable battery system having one or more battery clusters each having one or more switching devices and one or more battery cells, and an integrated controller configured to: transmit, from the integrated controller to the one or more switching devices associated with the one or more battery cells, one or more signals to generate a time-varying output current having a waveform, measure a time-varying voltage in response to the time-varying output current being applied to a load, and calculate an impedance based on the time-varying output current and the time-varying voltage at the frequency.