BMW has patented a calibration method for an electrochemical impedance measuring device used to measure an electrochemical cell’s impedance. The method involves connecting the device to an impedance standard, applying a signal, measuring current or voltage, and calibrating the device to the impedance target. The arrangement of terminals matches the cell’s geometry. GlobalData’s report on Bayerische Motoren Werke 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 Bayerische Motoren Werke, Battery management systems was a key innovation area identified from patents. Bayerische Motoren Werke's grant share as of February 2024 was 57%. Grant share is based on the ratio of number of grants to total number of patents.
Calibration method for electrochemical impedance measuring device
A recently granted patent (Publication Number: US11927663B2) discloses a calibration method for an electrochemical impedance measuring device used to measure the impedance of an electrochemical cell. The method involves connecting the device to an impedance normal with excitation and measurement connections, applying a voltage or current signal, measuring the resulting current or voltage, and calibrating the device against the impedance normal to achieve the desired impedance value. Importantly, the geometric arrangement of the connections of the impedance normal mirrors that of the electrochemical cell, allowing for accurate contact connection during calibration.
Furthermore, the patent claims detail specific aspects of the calibration method, such as the use of a lithium ion cell as the electrochemical cell, the arrangement of contact surfaces for anode and cathode connections, and the possibility of repeating the calibration process for different impedance values or excitation signals. Additionally, the impedance normal itself is designed to match various form factors, such as PHEV1, PHEV2, BEV1, or BEV2, ensuring compatibility with different types of electrochemical cells. Overall, the patented method and impedance normal aim to provide a reliable and efficient calibration process for electrochemical impedance measuring devices, enhancing the accuracy of impedance measurements in various applications.
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