Location History:
- Hitachi, JP (2007 - 2010)
- Hitachinaka, JP (2010 - 2015)
- Tokyo, JP (2016)
Company Filing History:
12 out of 42,508 
3 out of 69 
2 out of 1,641 
Years Active: 2007-2016
Title: Takefumi Okumura: Innovator in Lithium Battery Technology
Introduction
Takefumi Okumura, an accomplished inventor based in Hitachinaka, Japan, holds 15 patents, highlighting his significant contributions to the field of battery technology. His work focuses on developing advanced lithium secondary battery technology, which is crucial for enhancing the performance and efficiency of modern energy systems.
Latest Patents
Among his latest inventions is an innovative electrode for lithium secondary batteries. This electrode includes a metal substrate with a plated layer that bears active material and resin particles. Notably, some particles extend beyond the plated layer, enhancing the electrode's performance. This design helps lithium secondary batteries resist deterioration and performance degradation at high temperatures, making them particularly suitable for hybrid electric vehicles.
Additionally, he has developed a lithium-ion rechargeable battery module, which features a unique arrangement of battery cells. The cells are strategically connected in parallel, with those in high-temperature areas exhibiting higher resistance yet better storage characteristics compared to their low-temperature counterparts. This innovation improves energy efficiency and reliability in various applications.
Career Highlights
Takefumi has worked with notable companies, including Hitachi, Ltd. and Hitachi Vehicle Energy, Ltd., where he made significant strides in battery technology. His career is marked by a commitment to advancing the development of energy storage systems that meet the demands of contemporary electric and hybrid vehicles.
Collaborations
Throughout his career, Takefumi has collaborated with esteemed coworkers, such as Shin Nishimura and Norio Iwayasu. These partnerships have facilitated the exchange of ideas and fostered the innovation that has led to his numerous patents.
Conclusion
Takefumi Okumura's work in lithium battery technology exemplifies the spirit of innovation in energy solutions. His contributions are paving the way for improved energy storage systems that will play a vital role in the future of transportation and renewable energy. With his ongoing research and developments, Okumura continues to be a pivotal figure in the evolution of battery technologies.