Real-Time Battery State of Health Estimation via Operational Data Analysis
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Solution Overview
Problem
Existing methods for determining the state of health and charge of electrochemical devices, such as batteries, are often theoretical and require specific stress tests that degrade the device and can only be performed during maintenance or under certain conditions, making them impractical for real-time operational monitoring.
Innovation Solution
A method that collects and processes current and voltage data in real-time during operational periods, applies correction functions to calculate instantaneous charge and open circuit voltage, and uses incremental capacity analysis to estimate state of health and charge without degrading the device, allowing for continuous monitoring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If specific stress tests (characterization cycles) are imposed on the battery to measure state of health, then measurement precision is improved, but the device is degraded and requires maintenance period
Solution Approach 1:
The battery performs self-diagnosis by utilizing its own operational data (voltage, current, temperature) during normal operation to calculate state of health and state of charge, eliminating the need for external stress tests that would degrade the device
Solution Approach 2:
The patent replaces physical stress tests with computational analysis methods, using mathematical models and algorithms to process operational data and derive battery state parameters without mechanical or electrical stress
2Device complexity
If theoretical modeling is used to monitor performance losses, then device complexity is reduced, but measurement precision deteriorates as the actual state remains unknown
Solution Approach 1:
The patent introduces an intermediary computational layer that processes raw operational data through mathematical models and algorithms to produce accurate estimates of battery state parameters, bridging the gap between simple data collection and precise state determination
3Measurement precision
If complete charge and discharge cycles are required for measurement, then measurement precision is improved, but productivity decreases due to operational interruption
Solution Approach 1:
The patent achieves accurate state of health measurement through partial analysis of operational data during normal operation, without requiring complete charge-discharge cycles, thus maintaining productivity while obtaining sufficient measurement precision
Data Source
AI summary
A method for determining an open circuit voltage of an electrochemical device, including: a. collecting measurement data of the device, the measurements i. including at least the current It and the voltage Ut at the terminals of the device, ii. being time-stamped, and iii. being acquired during an uninterrupted and operational functional period of the device; b. calculating, for a plurality of times t, iv. a corrected intensity by applying a correction function to the measured intensity It, and v. an instantaneous charge based on a time series of the corrected intensity so as to obtain, for each time t, a set of collected and calculated data; c. grouping the data sets into ranges of instantaneous charge values based on the charge value of each set; and d. separately for each group, calculating an open circuit voltage of the device.