14250 battery

　　Panasonic develops new 14250 batterymanagement technology to evaluate residual value of lithium-ion 14250 batterypacks

　　According to foreign media reports, Panasonic has developed new 14250 batterymanagement technology to measure the electrochemical impedance of batteries and effectively evaluate the residual value of stacked lithium-ion 14250 batterypacks. It is expected to be applied to vehicles in the future. Panasonic developed this technology in collaboration with Professor Masahiro Fukui of Ritsumeikan University. Panasonic developed a new 14250 batterymonitoring IC (BMIC) test chip, measurement algorithm and software, and Ritsumeikan University used the 14250 batteryto evaluate actual performance.

　　The new 14250 batterymanagement technology uses alternating current excitation to measure the electrochemical impedance of stacked lithium-ion 14250 batterymodules. In addition, residual value is evaluated through deterioration diagnosis and failure evaluation based on measurement data. This will help promote the recycling and reuse of lithium-ion batteries and achieve sustainable development.

　　This new technology has the following features:

　　1. Measure the electrochemical impedance of multi-cell 14250 batterypacks through BMIC technology.

　　Traditional BMICs can measure the voltage of lithium-ion 14250 batterypacks stacked from 6 to 14 cells. In the 14250 batterymanagement system, voltage data can be obtained from more series-connected 14250 batterycells (up to 200) through multiple BMICs to monitor the 14250 batteryoperating status and ensure safe use. In addition, the charging and health status can be evaluated, and the remaining cruising range and time can be calculated.

　　In addition to traditional functions, the newly developed BMIC test chip also has a built-in electrochemical impedance measurement function and uses the alternating current excitation method for measurement. The electrochemical impedance measurement is achieved through 15 fully parallel analog/digital converters, a pulse-modulated AC excitation circuit from 0.1 Hz to 5khz, and a complex voltage/complex current conversion circuit built into the BMIC. Therefore, the BMIC chip can measure the electrochemical impedance of the 14250 batterywhile it is running without requiring major adjustments to the BMS configuration currently in the battery.

　　2. When performing electrochemical impedance measurements, the measurement accuracy is the same as that of standard instruments.

　　State assessment is performed using electrochemical impedance spectroscopy by measuring Cole-Cole plots drawn with complex impedances. Ritsumeikan University used BMIC and measurement software developed by Panasonic Corporation to measure cylindrical lithium-ion batteries. The results show that Cole-Cole diagrams can be measured and drawn in the frequency range from 1 Hz to 5 KHz and achieve the same accuracy as standard measuring instruments used in industry.

　　3. React to temperature changes of operating equipment through temperature calibration technology.

　　The electrochemical impedance of lithium-ion batteries is very sensitive to temperature changes. Therefore, when measuring using special measuring instruments in the laboratory, the 14250 batteryshould be placed in a constant temperature room to maintain a constant temperature. For 14250 batterymodules during operation, stable electrochemical impedance measurement cannot be performed due to the constant changes in ambient temperature. Therefore, Ritsumeikan University and Panasonic Corporation in Japan developed a temperature correction technology. During the electrochemical impedance measurement process, the temperature of the lithium-ion 14250 batteryis measured, the impedance temperature change is corrected to the standard temperature, and plotted on a Cole-Cole diagram. In this way, even if the ambient temperature changes as seasons and time change, it can be corrected to the standard temperature in the database based on the Cole-Cole diagram.

　　The new technology is suitable for equipment and vehicles with multi-cell lithium-ion batteries, such as electric bicycles, low-speed vehicles, construction and logistics machinery, etc., and can be used in electric vehicles and large-capacity batteries in the future.

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