Location History:
- Suita, JP (1992 - 2000)
- Otokuni-gun, JP (1999 - 2000)
- Kyoto, JP (2014)
- Osaka, JP (1994 - 2021)
- Ibaraki, JP (2001 - 2023)
Company Filing History:
20 out of 1,112 
2 out of 52 
2 out of 890 
Years Active: 1992-2025
Title: **Fusaji Kita: Innovating Lithium Secondary Battery Technology**
Introduction
Fusaji Kita, an accomplished inventor based in Ibaraki, Japan, has significantly contributed to the field of electrochemical devices through his innovative patents. With a remarkable portfolio of 25 patents, he has dedicated his career to enhancing energy storage technologies, particularly lithium secondary batteries.
Latest Patents
Kita's recent inventions highlight his expertise and focus on improving battery performance. One of his notable patents involves a **lithium secondary battery pack**, which integrates a lithium secondary battery composed of a positive and negative electrode with a separator and a non-aqueous electrolyte. This innovative design includes a Positive Temperature Coefficient (PTC) element and a protection circuit with a field-effect transistor. Remarkably, the battery boasts an energy density of over 450 Wh/L and establishes critical impedance relationships to ensure optimal performance.
Another significant patent is a **separator for electrochemical devices**. This technology emphasizes safety, especially at high temperatures, through the use of a porous film featuring heat-resistant materials, shutdown resins, and binders. The separator is specifically designed to swell with temperature increases, enhancing the safety and functionality of electrochemical devices.
Career Highlights
Kita has garnered extensive experience throughout his career, primarily through his tenure at renowned companies like Hitachi Maxell, Limited and Maxell Holdings, Ltd. His work at these organizations has provided him with vast insights into the production and development of advanced battery technologies, leading to his numerous patents that benefit various applications in energy storage.
Collaborations
Collaboration has been a key aspect of Kita's innovative endeavors. Notable coworkers like Akira Kawakami and Hideo Sakata have contributed to his research and development efforts, fostering an environment of shared knowledge and expertise that drives the creation of groundbreaking technologies in the field of batteries and electrochemical devices.
Conclusion
In conclusion, Fusaji Kita's contributions to the field of lithium secondary batteries and electrochemical devices demonstrate his commitment to innovation and safety in energy storage technologies. His extensive patent portfolio continues to inspire advancements and improvements in this rapidly evolving industry, paving the way for more efficient and safer energy solutions.