At Ohkita Seisakusyo, we focus squarely on the products we deliver to customers.
At all times, we follow the maxim “be true to yourself.”
For over 40 years, we’ve put our heart and soul into monozukuri－the art of manufacturing.
There has been more than just quality, price, delivery, and service to our success: we believe that the many
opportunities we have had to develop products together with customers have been the result of our
dedication and pride in manufacturing products with sincerity.
We continue to forge ahead with the firm belief that our worldwide customers can share and respect
our philosophy on manufacturing.
Our battery cases and other components are used in industrial batteries in many
high-tech applications where reliability is vital, such as in aerospace and electric vehicles.
We handle special process quality control, and we have a proven track record in welding
0.1 mm and thinner safety valves that release when the pressure gets too high inside
Our battery components are also used on Japan’s H-IIA rocket.
Many of our components are used in batteries for outer space
applications, such as in rockets, satellites, and the International
Space Station, where quality requirements are extremely stringent.
Electric/Hybrid Vehicle Applications
We make components for prototypes of the batteries that power electric and hybrid
vehicles. We have a proven track record in providing aluminum and stainless steel battery
cases for manufacturers of cars, batteries, and condensers.
One of our components is used for batteries on the Shinkai 6500 manned research
submersible, which is owned by JAMSTEC (Japan Agency for Marine-Earth Science and
Ohkita’s industrial battery components are used widely in fields such as outer space, aviation, and
submersibles－areas where the crucial machine components must operate without fail and meet the
highest standards of reliability and traceability.
Products and Technologies
Welded Battery Cases
●High precision, superb fit with lid
We use laser welding, GTA welding, and spot welding to make high-quality products.
Our strength lies in our ability to create battery cases by combining welding technology
and high-precision press technology. We can make cases from materials such as stainless
steel, aluminum alloy, and titanium.
We conduct helium? leak testing on all products to ensure airtightness. We also offer
penetrant testing on request.
●Can weld sheet thicknesses under 0.1 mm
We have more than 10 years of experience in welding sheet thicknesses under 0.1 mm
－for example, with safety valves.
Smooth bead connecting with less spattering.
The advantages of welded battery cases
Aluminum case just 3 × 5 mm in size!
Photo:Comparison with peanut and grains of rice
Stainless steel cases, aluminum cases, titanium cases
Electrodeposition coating for insulation
We perform electrodeposition to insulate metals such as stainless steel, copper,
and aluminum. For this process, we use Nippon Paint Industrial Coatings’ Insuleed.
This high-performance electrocoating material has the following features:
Coating can be formed onto complex shapes
that are difficult to cover with insulation
tubes and insulation film
Can be done on parts
under 10 mm in size
We have a proven track record in supplying lid assemblies and other components
for lithium-ion battery used in private-sector aircraft. According to customer
needs, we make or procure the lid, the current collector, the terminals, and the
sealing and we then assemble these into a unit to sell. We can also perform
helium leak testing. We handle everything from assembly of customer-designed
lids to proposals for the design stage. The lid fits securely onto the case.
Seal welding can also be carried out.
Ohkita’s Manufacturing Process
* Manufactured under special process control rules specified according to customer requests.
Certified for JIS Q 9100
Our Shimamoto Factory was certified in September 2015 for JIS Q 9100. This means it
meets the requirements for quality management systems in the manufacture of special
battery parts for civil aircrafts and space applications.
Production and Quality Control System
We take a centralized approach to production and quality control.
Every stage, from receiving an order to delivering the product, is managed through an integrated
database. Our manufacturing records ensure that our products are all traceable.
The 59th Battery Symposium
At this event－held in Osaka from November 11 to 15, 2019－we displayed our welded
battery cases and electrodeposition-insulated samples.
From its roots almost 60 years ago, the Battery Symposium has grown to become one
of the world’s major battery events. It is held annually by the Electrochemical Society
of Japan’s Committee of Battery Technology. The symposium provides an open venue
for reporting and discussing research results and other developments in the materials,
processes, and systems of primary cells, rechargeable batteries, fuel cells,
capacitors, and other battery-related items.
Order and Production System
If it’s battery-related, we do it
We make a wide range of battery components. These include cases, lid assemblies,
and current collectors for lithium-ion batteries, electrodes for seawater batteries,
and rolled silver chloride sheets.
We also have the technical expertise to make outer casings for battery units and
to solder connectors and lead wires.
Even for products with complex processes, we can handle most of the processes in-house
and with strict quality control－everything from making the product to delivering it to
Always evolving?that’s Ohkita’s DNA
We do cutting-edge research on large, special-purpose batteries.
And we use all our experience to support customers and come up with new products,
while protecting our customers’ confidential information.
Ohkita’s 5 Strengths
|Company name:||OHKITA SEISAKUSYO|
|Metal working by Laser/GTA Welder /Press machine
Riveting and assembly
AgCl sheet processing
Sales of Silver foil