Panasonic Develops New Battery Management Technology

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  • The technology has been developed in collaboration with Professor Masahiro Fukui of Ritsumeikan University
  • The technology can measure electrochemical impedance using the AC current excitation method for lithium-ion stacked battery modules

Panasonic has developed a new battery management technology that measures the electrochemical impedance of multi-stacked batteries. The company says this method will be effective to measure the residual value of lithium-ion batteries in devices. The technology can be applied to devices that use lithium-ion battery modules with many battery cells stacked in series and to future vehicles claims Panasonic.

The company has developed the technology in collaboration with Professor Masahiro Fukui of Ritsumeikan University. It has also developed a new battery monitoring integrated circuit (IC) test chip, measurement algorithm, and software and Ritsumeikan University evaluated the performance using actual batteries.

Panasonic says the battery management technology developed can measure electrochemical impedance using the AC current excitation method for lithium-ion stacked battery modules that are installed in operating devices. The technology aims to enable the evaluation of residual value by way of a deterioration diagnosis and failure estimation based on an analysis of acquired measurement data.

15 fully parallel analog or digital converters

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The battery management integrated chip (BMIC) comes with a built-in electrochemical impedance measurement function using the AC current excitation method. The electrochemical impedance measurement is achieved by 15 fully parallel analog or digital converters and an AC current excitation circuit with pulse modulation from 0.1 Hz to 5 KHz and a complex voltage or complex current conversion circuit built in the BMIC says Panasonic. The BMIC chip can measure the electrochemical impedance of a battery in operation without changing the configuration of the current BMS installed in the battery by a large extent.

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