Location History:
- Tokyo, JP (1992 - 1994)
- Saitama, JP (2016 - 2018)
Company Filing History:
4 out of 338 
2 out of 4 Years Active: 1992-2018
Title: Innovations by Shigeaki Watarai in Energy Storage Technology
Introduction
Shigeaki Watarai is a notable inventor based in Tokyo, Japan. He has made significant contributions to the field of energy storage devices, holding a total of 4 patents. His work focuses on improving the efficiency and effectiveness of electrodes used in these devices.
Latest Patents
Watarai's latest patents include a method of manufacturing an electrode for an energy storage device. This innovative electrode features a zinc layer or zinc alloy layer, a nickel layer, and a tin layer or tin alloy layer. These layers are formed by plating on a connecting terminal part of a positive electrode made of aluminum. This design reduces the resistance value at the contacting point, allowing for effective voltage supply without any drop. The electrode can be soldered to a copper negative electrode, which is composed of a different metal species from aluminum, through a tin layer or tin alloy layer. This enhances the jointing strength between the aluminum positive electrode and the copper negative electrode. Additionally, the increased contacting area compared to conventional methods, such as spot-welding or bolting, further reduces the resistance value at the contacting point, minimizing voltage drop due to contact resistance.
Career Highlights
Throughout his career, Watarai has worked with prominent companies, including Senju Metal Industry Co., Ltd. and Nihon Junyaku Co., Ltd. His experience in these organizations has contributed to his expertise in energy storage technologies.
Collaborations
Watarai has collaborated with notable colleagues, including Mitsuo Ishikawa and Katsuji Nakamura. Their combined efforts have further advanced the field of energy storage devices.
Conclusion
Shigeaki Watarai's innovative work in the development of energy storage device electrodes showcases his commitment to enhancing technology in this vital area. His patents reflect a deep understanding of materials and engineering principles, contributing to more efficient energy solutions.