Multispectral Battery Impedance Sensing Under Dynamic Load
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Solution Overview
Problem
Current impedance measurement techniques, such as EIS and multispectral methods, are limited in their ability to accurately measure battery impedance under dynamic load conditions in-situ, leading to potential errors over time without periodic recalibration and inability to determine accurate impedance data.
Innovation Solution
A method and system that utilize a multispectral excitation signal applied to a device under test while under load, with a signal conditioner and data acquisition system to sample the response, and a computing system to estimate and subtract load response corruption, allowing for accurate impedance measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional EIS techniques are used under no-load conditions, then measurement accuracy is maintained, but measurement speed is slow and periodic recalibration is required
Solution Approach 1:
The patent applies periodic multispectral excitation signals at multiple frequencies simultaneously to the battery under dynamic load conditions. This periodic multi-frequency excitation enables rapid impedance assessment without requiring sequential measurements or periodic recalibration, resolving the contradiction between measurement accuracy and speed by achieving both through parallel frequency excitation.
Solution Approach 2:
The patent changes the measurement parameters by transitioning from single-frequency sequential excitation under no-load conditions to multi-frequency simultaneous excitation under dynamic load conditions. This parameter change enables the system to maintain measurement accuracy while significantly improving measurement speed and eliminating the need for periodic recalibration.
2Quantity of substance
If multispectral techniques are used in laboratory environments, then broadband impedance data can be obtained, but the techniques cannot determine accurate impedance data under dynamic load conditions
Solution Approach 1:
The patent introduces an intermediary processing step that separates the load response from the impedance response. By using signal processing techniques to isolate and remove the load-induced voltage components from the total measured voltage, the system can accurately extract impedance data under dynamic load conditions, resolving the contradiction between obtaining broadband data and maintaining accuracy under load.
Solution Approach 2:
The patent segments the total voltage response into distinct components: the impedance response to multispectral excitation and the load response. This segmentation allows independent analysis and processing of each component, enabling accurate impedance measurement under dynamic load by focusing on the excitation-induced response while filtering out load-induced variations.
3Loss of time
If single frequency measurements are used for in-situ techniques, then measurement time is reduced, but errors develop over time without periodic recalibration
Solution Approach 1:
The patent makes the impedance measurement system universal by implementing multi-frequency excitation that can operate under both static and dynamic load conditions. This multi-functional approach allows the same measurement technique to provide reliable, recalibration-free measurements across varying operational conditions, resolving the contradiction between rapid measurement and long-term stability.
Data Source
AI summary
Impedance testing devices, circuits, systems, and related methods are disclosed. A method may include exciting a device coupled to a load, and capturing a response of the device. The method may further include adjusting the response based on an estimated load response of the device, and estimating an impedance of the device based on the adjusted response.