Electricite de France patented a method to measure electrochemical cell wear by constructing a correlation chart between rapid and slow discharges. The method involves training and characterization sequences, as well as an aging phase to obtain real capacity for different parameters. The patent aims to improve cell performance evaluation. GlobalData’s report on Electricite de France gives a 360-degree view of the company including its patenting strategy. Buy the report here.

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According to GlobalData’s company profile on Electricite de France, Battery management systems was a key innovation area identified from patents. Electricite de France's grant share as of January 2024 was 64%. Grant share is based on the ratio of number of grants to total number of patents.

Method for measuring wear of electrochemical cell through discharge correlations

Source: United States Patent and Trademark Office (USPTO). Credit: Electricite de France SA

A recently granted patent (Publication Number: US11874333B2) discloses a method for constructing a chart of correlations between rapid and slow discharges to measure the wear of electrochemical cells. The method involves a measurement phase with training and characterization sequences, followed by an aging phase. During the training sequence, the cell is charged and discharged at reference current levels, while the characterization sequence involves increasing the current level to determine the real capacity of the cell. The aging phase alternates charges and discharges without relaxation. By iterating the measurement phase with different current levels and constructing a chart of correlations, a corrective factor for wear levels is obtained.

Furthermore, the patent includes details on the variation of current levels, relaxation durations, and the calculation of real capacity based on discharge time and current intensity. The method also provides for determining the state of wear of the cell under different current levels by comparing measurements to the constructed chart of correlations. Additionally, the patent covers a test bench designed to connect to electrochemical cells for implementing the method and a computer-readable storage medium containing the program for executing the method. Overall, the patent offers a comprehensive approach to accurately measure and monitor the wear of electrochemical cells through a systematic and structured process involving different current levels and discharge sequences.

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GlobalData Patent Analytics tracks bibliographic data, legal events data, point in time patent ownerships, and backward and forward citations from global patenting offices. Textual analysis and official patent classifications are used to group patents into key thematic areas and link them to specific companies across the world’s largest industries.