ABOUT US

ABOUT US

Powering Battery Innovation Through Prototyping Excellence

Since our founding, we have consistently pursued “battery prototyping excellence.” Leveraging our hands-on experience and knowledge, we have been improving speed and accuracy of prototyping of lithium-ion battery electrodes and cells. We provide fundamental and creative solutions to the clients’ challenges in battery development. Speed and flexibility are our core competences.

SEI‘s Strength

"Genba" oriented
Battery Technology

  • 01

    Prototyping Excellence

    Since our founding, we have consistently pursued “battery prototyping excellence.” Leveraging our hands-on experience and knowledge, we have been improving speed and accuracy of prototyping of lithium-ion battery electrodes and cells.

  • 02

    Technical Expertise

    With state-of-the-art facilities and highly skilled engineers, we contribute to archive customer’s development target. We provide one-stop prototyping service from slurry production to cell evaluation with our in-house facilities to respond swiftly to customer challenges.

  • 03

    Fast and Flexible Service

    Speed and flexibility are our core competences. We respond quickly to customer requests and provide fundamental and creative solutions to the clients’ challenges in battery development.

COMPANY

Mission

Contribute to a
Carbon Neutral Society

Vision

Provide agile and “Genba” oriented services
to accelerate customer’s battery development

Message from CEO

We value building close relationships with our customers
and leverage our on-site expertise and responsiveness.

SEI Corporation (SEI) specializes in the prototyping and validation of lithium-ion batteries and has supported battery development for numerous customers to date. We provide comprehensive services ranging from material evaluation to cell prototyping and performance testing, and we place great importance on maintaining close relationships with our customers to leverage our on-site expertise and agility. Lithium-ion batteries are an essential technology for realizing a decarbonized society and promoting the widespread adoption of sustainable energy. Utilizing state-of-the-art equipment and proprietary technologies, we are driving the development of long-lasting, high-performance batteries. By flexibly addressing our customers’ diverse needs and delivering highly reliable evaluation results, we contribute to accelerating our customers’ battery development and advancing society. In 2024, we became a subsidiary of KRI Co., Ltd., a member of the Daigas Group. This allows us to offer a broader range of proposals and support by leveraging the Group’s collective technology and expertise to meet our customers’ specific needs. Moving forward, SEI will continue to hone our “Prototyping Excellence” and “Technical Expertise” as we take on new challenges as a partner supporting the future energy society. We look forward to your continued support of SEI Co., Ltd.

CEO
Shin Iwata

COMPANY

  • Company Name

    SEI Corporation

  • CEO

    Shin Iwata

  • Established

    November 11, 1999

  • Capital

    ¥197,975,000

  • Location

    862-2 Hisai-shinmachi, Tsu, Mie, Japan

  • Employees

    15

  • Main business

    ・Contract R&D and prototyping on lithium-ion batteries and next-generation batteries
    ・Consulting services related to the above

  • Shareholder

    KRI, Inc. (a subsidiary of Osaka Gas Co., Ltd.) 100%

  • URL

History

  • 1999

    - Established in Tsu, Mie, started electronic components business

  • 2002

    - Started lithium-ion battery (LiB) business

    Conducted R&D support of high-power cathode and anode active materials

  • 2004

    - Developed long-life, low-cost LiFePO4 material

    - Jointly filed 1 patent with a material supplier (registered)

  • 2007

    - Started LiB electrode and cell technology development for PHEVs and EVs

  • 2011

    - Developed ‘Projection Foil’ technology and its prototype manufacturing equipment

    Jointly filed 1 patent with an automotive OEM (registered)

  • 2012

    - Started partnership with Fraunhofer ICT, Germany and EDF, France

  • 2013

    - Developed LiB for 12V vehicle battery with ultra-low temp. and high regenerative capability

  • 2016

    - Started VDA-PHEV2 type prismatic cell prototyping (14–50Ah)

  • 2018

    - Started 18650/21700 type cylindrical cell prototyping

  • 2023

    - Started VDA-350/550 type laminate cell prototyping

  • 2024

    - Joined the Daigas Group, established new R&D building

  • 2026

    - Started R&D support of next-generation secondary battery technologies