ESU (Charger+DCDC Converter):Denso (Toyota bZ4X (2022)) Teardown Report

Cited from : https://toyota.jp
bZ4X (from WEB Information)	ESU (Electricity Supply Unit)

Overview

Toyota’s first EV in the bZ series, jointly developed with partner Subaru, is an SUV-type BEV ) released in May 2022.

The range is 559 km for FWD and 540 km for 4WD.  Vehicle prices are 6 million JPY for FWD and 6.5 million JPY for 4WD.

• Notably, this vehicle features the ESU (Electricity Supply Unit) (manufactured by Denso), which combines a charger and a DC-DC converter, marking Toyota’s first integration of this unit.

Product Features

• The ESU performs AC-to-DC voltage conversion to charge the BEV’s high-voltage battery.
• The mixed-load DC-DC converter steps down the BEV’s high-voltage battery (355V) to 12V.
• The unit case incorporates cooling water channels, optimizing heat dissipation by arranging the onboard charger and DC-DC converter in a compact, integrated design. This achieves a 23% reduction in size and a 17% weight reduction compared to separate installations.

Report Contents (38 pages)

• Product disassembly (with photos at each stage)
• List of installed components (including 6 circuit boards)
• Details of each board’s functions and connections

Delivered one week after order placement. Please contact us for report pricing.