Location History:
- Kusatsu, JP (2005 - 2010)
- Shiga, JP (2006 - 2024)
Company Filing History:
6 out of 27,375 
6 out of 16,453 
3 out of 167 Years Active: 2005-2024
Title: Keiichi Fujii: Innovator in Battery Management Technologies
Introduction
Keiichi Fujii is a prominent inventor based in Kusatsu, Japan. He has made significant contributions to the field of battery management technologies, holding a total of 15 patents. His work focuses on integrated circuits and battery monitoring systems, which are crucial for the advancement of energy storage solutions.
Latest Patents
Fujii's latest patents include an innovative battery monitoring device. This device features a pair of terminals for measuring the voltage or current of a battery, connected to a filter unit that includes a capacitive element. An AD converter measures the waveform of voltage during the charging or discharging of the capacitive element. Additionally, a time constant calculation unit computes the time constant of the filter unit based on the measured waveform.
Another notable patent is for a battery management circuit. This circuit includes a reference signal generator that produces two reference frequency signals with different phases. An alternating-current superimposer applies an alternating current to the secondary battery, while a voltage measurer and a current measurer sample the voltage and current, respectively. The results are converted into complex voltage and current using the reference frequency signals.
Career Highlights
Fujii has worked with notable companies such as Matsushita Electric Industrial Co., Ltd. and Panasonic Corporation. His experience in these organizations has allowed him to develop and refine his innovative ideas in battery technology.
Collaborations
Throughout his career, Fujii has collaborated with talented individuals, including Taku Kobayashi and Hitoshi Kobayashi. These partnerships have contributed to the successful development of his patented technologies.
Conclusion
Keiichi Fujii is a distinguished inventor whose work in battery management systems has paved the way for advancements in energy storage technology. His innovative patents and collaborations highlight his significant impact on the industry.