Press release2022.06.15

Suncall -the worldwide valve spring supplier-launched anew model of Shunt bus bar, parts for BEV and HEV
named ʻʼ shunt bus-bar with a connector ʼʼIn May 2022, worldwide automotive parts supplier in Kyoto Japan,Suncall (Headquarters: Kyoto City, President: Tadao Ohtani) launched‘’shunt bus bar with a connector’’ as a new lineup of their EV-related
products. It realizes more accurate sensing than the existing pin type.
Shunt bus bar, one of our next-generation-focusing-item, is used as acurrent detection sensor in BMS (battery management system) of EVs(electric vehicles), and has a great responsibility for precise control ofcharging/discharging. (Note 1).
According to existing products, setting terminal pins on shunt bus bar
is the normal way to detect the current flowing on the bus bar.

However, our developed "shunt bus bar with a connector" can detectfrom connector port that is directly adhered on the electric circuitboard. (photo1).

photo1：shunt bus bar with a connector◆ One-touch simple assembly that also measures temperature
When detecting current by shunt bus bar, fine positioning of thedetection point is the most crucial matter. Therefore, we focused on
obtaining the detection point at the most accurate position by adhering
the connector board onto the bus bar. The board has a simple
configuration in which only a thermistor and a connector are mounted.
By adding a temperature measurement function, it enables customer tocorrect the resistance value in their current control system such asBMS.
In addition, it gives great assemble-ability on the customer side,
providing one-touch wiring with the connector port.
The greatest advantage is that, it is now possible to provide current
value and temperature information with the high accuracy (0.1%accuracy) by required level from OEMs and BMS manufacturers.

simple assembly with connector with BMS◆ For the EV era of 2050
In recent years, EVs are becoming more and more popular as acountermeasure against climate change and it is said that about half of
new car sales will be BEVs in 2050 (Note 3, Wood Mackenzie survey).
When driving an electric vehicle, it is must to monitor charging/discharging value of the lithium-ion battery, which is working as thepower source in the car. There, it is essential to measure the current
value that constantly flows.
Therefore, lean and highly accurate sensing technology greatly affectlife of the battery and mileage, and sophistication of its technology isrequired.

Shunt bas bar is adopted in BMS(Battery management system)

Born in Kyoto as a manufacturer of valve springs wire, we have beenwalking together with the Japanese automotive industry for over 70years, supporting core-components for automobiles, such as enginesand trans-missions.
Following the unique business model of "integrated production frommaterials to precision processed products", we have kept a strong
relationship of trust as a good partner with major car manufacturers
such as Toyota. In the medium-term management target (Note 4)announced in February 2022, we set forth ‘’contribution to carbon
neutrality’’ as one of our challenge, aiming to take flight from an engine
vehicle parts manufacturer to an EV parts manufacturer.

Shunt bus bar of pin-type

As for shunt bus bar, we start developing it 10 years ago, and it has
been adopted for electric vehicles and AGVs (automated guidedvehicles) acknowledged as a part that has both design flexibility byexisting technology and high-precision sensing technology.
In order to meet the increasing demand from Western OEMs inrecent years, we integrated the development section in Kyoto in 2021,
and also completed IATF 16949 certification in February 2022.

exhibiting at battery show (Stuttgart, Germany)

This new product "shunt bus bar with a connector", we already received
inquiries from European customers, and will be exhibited at The Batteryshow Europe (held 6 / 28-30 at Messe Stuttgart) at Stuttgart held in June
2022. (Note 2).We will continue to develop products listening to ourcustomer’s voice aiming at further expansion from now on.

Note1︓https://www.suncall.co.jp/shunt-sensor-solution/shunt-busbar/
Note2︓https://www.thebatteryshow.eu/en/Home.html
Note3 :https://www.woodmac.com/press-releases/700-million-electric-vehicles-

will-be-on-the-roads-by-2050/
Note4︓(※1)「GLOBAL GROWTH PLAN 2024（GGP24）」（2022 Feb.10th）
https://www.suncall.co.jp/wp/wp-content/uploads/2022/02/20220210ggp24url.pdf

Suncall corporation︓
CEO︓Tadao Ohtani

Established︓1943 June

Adress︓Nishiura-cho,14 Umezu,Ukyo-ku,Kyoto Japan

web-site︓https://www.suncall.co.jp
EV related products︓https://www.suncall.co.jp/shunt-sensor-solution/

For more information:
Business Strategy Promotion sect. Corporate Planning Dept.
E-mail:yutaka̲kunisawa@suncall.co.jp / fusako̲kubo@suncall.co.jp+81-75-881-8122