SEI Corporation
Battery Speciality Company
Tell Me More

Li-ion battery development

provide smart, excel and intelligent solutions in lithium-ion battery development with 17 year of professional experience.

Electrode
Coating

Provide high-quality electrode with variety of coating type (single / double, continuous / intermittent). Abundant experience in new materials such as Ni-rich cathode or SiOx anode. Propose the best recipe for your material.

Cell
Prototyping

Pouch cell with 0.03-1Ah (for material evaluation) to 20Ah, prismatic cell (VDA-PHEV2 capable) and cylindrical cell (21700 capable) are avairable. All cell-assy processes are conducted in a dry-room.

New Technology
Development

Our knowledge and experience through in-house and contract development will help the you make new findings. We will strictly protect your secret from the meeting phase and promise highly reliable test result.

High-Quality Cell Prototyping

From material to in-vehicle cell evaluation.

Pouch

0.03 ~ 0.1Ah
(material evaluation)
Max 20Ah

Prismatic

14 ~ 40Ah
VDA-PHV2 capable

Cylindrical

3 ~ 4.5Ah
21700 capable

Our Technologies

Material and electrode development with high-power and long-life.

LFP+ Material

3D Projection Foil

12V Automotive LiB

  • 1999

    Established SEI Corporation

    Started design, development and sales of electronics parts such as LED, memory, semiconductor-chip and battery manegement unit for Li-ion batteries. The business is ongoing until now.

  • 2002

    Started high-power LiB material development

  • 2004

    - Started development of advanced LiFePO4 material with high-power and long-life

    - Started joint development with Japanese automotive companies

  • 2007

    Started development of HV/EV battery technology

  • 2011

    Joint development of LiFePO4 with Hydeo-Quebec

    Completed application of 4 patent families.

  • 2012

    Started collaboration with Frauhofer ICT and other German OEM/suppliers

  • 2013

    Fixed basic spec of 12V LiB for start-stop use

    Altanative to conventional lead-acid battery.

  • 2014

    Start providing prototype electrodes and cells for vehicle use

    Archived max coating length of 10,000m.

  • 2015

    Our 12V LiB design (prototype) passed EU-standard CCA test

  • 2016

    Started VDA-PHEV2 prismatic cell prototyping

  • 2018

    Started contract development of all-solid LiB

  • Be Part
    Of Our
    Story!

Mixer

0.5L / 5L / 15L

Coater

Comma-reverse / Die-head
Length: 3 - 5,000m

Press

Cold/Hot (Max 140℃)
Max 20ton

Slitter

Unwind: Max 350mm
Wind: Max 175mm

Dry-room

Capable of all cell-assy processes

Stacking

Pouch
Prismatic (VDA-PHEV2)

Winding

Cylindrical (21700)

Ultrasonic welder

Battery tester

Max 200A, -30 to 90℃

About Us


Management Policy:

- Innovation Through Invention

- Battery Speciality Company



Company Overview:


Company Name

SEI Corporation


President

Takehiko Sawai


Address

862-2 Hisai-shinmachi,
Tsu, Mie, 5141118 Japan


Capital

JPY 197,975,000


Date of Establishment

November 11, 1999


Division

[R&D division]

1. Battery material development with long-life, low-impedance, low-temperature performance and safety, and 2. Providing solution in electrode production. Future vision: Establish standard material and process technologies.

[Electronics division]

Development and sales of LED, memory, semiconductor-chip, BMS for Li-ion batteries etc.



Contact

info@seicorp.jp

Tel: +81-592545151