SEI Corporation | Battery Speciality Company
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.
See past projects here.

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 PHEV/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