Industrial Consultancy & Sponsored Research (IC&SR) , IIT Madras
Method For Impedance Measurement Using Multiple Phase Shifted Chirp Signals
Technology Category/Market
Category- Energy, Energy Storage & Renewable Energy
Industry Classification:
Electrochemical Energy Systems; Portable Electronics etc
Applications:
Battery Management System Battery Diagnostics; Fuel Cell Analysis; Embedded systems in portable or compact devices for real-time impedance monitoring and other etc.
Market report:
The global Battery Management System market size was valued at USD 9.1 billion in 2024 and is projected to reach USD 22 billion by 2029 with a CAGR of 19.3%
Problem Statement
- Electrochemical energy systems, like batteries and fuel cells, experience irreversible performance and capacity degradation over time. However, regular Impedance based diagnosis and management can extend their lifespan.
- Conventional electrochemical Impedance Spectroscopy (EIS) is widely used but is slow, bulky, and unsuitable for real-time or fast-changing systems.
- Moreover, current methods need extensive data and struggle with noise/system nonlinearity, and demand high computational resources.
- There is a need for method of diagnosis that uses phase-shifted chirp signals for quick, accurate impedance measurement, operable on compact, low-power devices.
Technology
- The invention provides a rapid, precise method for impedance measurement using dual and triple phase-shifted chirp signals, ideal for diagnosing electrochemical systems like batteries, fuel cells, and other dynamic systems..
- The method involves perturbing the system with chirp signals (voltage/current), acquiring transient response data, and calculating impedance via instantaneous amplitude ratio and phase shift using computationally efficient algorithms
- Operates over a frequency range of 0.001 Hz to 10 kHz, delivering results within 3-7 seconds, with minimal computational power requirements suitable for small, low-power devices.
- Offers 10x faster measurement than conventional Electrochemical Impedance Spectroscopy (EIS), ensures high accuracy even for non-linear systems, and minimizes data processing and noise sensitivity.
- Enables real-time, portable diagnostics for industries like energy storage, material science, and biotechnology, addressing challenges in conventional impedance measurement systems with scalable and cost-efficient implementation.
Key Features/Value Proposition
- The invention delivers impedance results in 3-7 seconds, significantly faster than the conventional EIS method, which can take over 45 seconds for the same frequency range.
- Measures impedance across a frequency range of 0.001 Hz to 10 kHz with high precision. Existing methods are often slower and lack the ability to analyze dynamic systems with comparable accuracy.
- A comparison of impedance profile estimated using triple chirp analysis method after additional denoising with interval halving in comparison with the theoretical impedance makes a compelling case for its robustness and commercial viability.
- Unlike conventional EIS, which measures at discrete frequencies, the invention uses chirp signals for a continuous sweep, gathering richer data about system properties within a shorter duration.
Questions about this Technology?
Contact for Licensing
Research Lab
Prof. Raghunathan Rengaswamy
Department of Chemical Engineering
Intellectual Property
- IITM IDF Ref 1741
- IN 513596 Patent Granted
Technology Readiness Level
TRL 4
Technology Validated in Lab