Toyota MIRAI 2 2021MY (EU)

Specification
Fuel Cell Type	Polymer electrolyte
Number of cells	330
Max output (kW/DIN hp)	128/174
Power density (kW/l)	5.4
Fuel tank capacity (kg)	5.6
Volume (litre)	142.2
HV Battery Type	Lithium-ion
Nominal voltage (V)	310.8
E-Motor Type	PMSM
Max. power (kW/DIN hp)	134/182
Max. torque (Nm)	300

Key Features

The MIRAI 2 is developed based on Toyota's modular GA-L platform.
The new platform allows the addition of a third hydrogen fuel tank, extending the driving range by 30% to approximately 650 km.
The fuel cell system has been completely redesigned, significantly reducing the size and weight of key components.
By mounting a fully redesigned fuel cell electric powertrain on the GA-L vehicle platform, the MIRAI 2 achieves an ideal 50:50 chassis balance.

Fuel Cell System Integration

Main components of the MIRAI 2 fuel cell system are installed at front compartment of the vehicle above the front axle.
The fuel cell stack and the FC boost DC/DC converter are stacked on top of each other
The FC boost converter contains:

DC/DC converter to boost FC voltage to 650V
Other power electronics components like inverter stages of e.g. coolant pumps

Power Unit

Different power electronics functions are integrated within one power unit in a highly integrated approach.

DC/DC converter HV to 12 V board net
DC/DC converter for HV battery
Inverter traction motor
Inverter fuel cell air compressor

Denso power card modules enable double-sided cooling for semiconductors.
The multipiece housing consists of cast and sheet metal components.

Electric Drive Unit (EDU)

MIRAI 2 is driven by an electric motor at the rear axle with maximum power of 134 kW.
The electric drive unit (EDU) including electric motor and 1-speed gearbox is cooled using a separate oil circuit consisting of:

Electrical oil pump mounted to the EDU
Two oil coolers mounted behind rear wheel housings using air as cooling medium

Lubrication of gearbox is realized with internal mechanical oil pump.
Park lock system is integrated into gearbox.

Fuel cell

Proton-exchange membrane fuel cell is used for MIRAI 2.
Different media are supplied through cutouts.
330 cells are connected in series, which is 40 cells less compared to MIRAI 1.
One fuel cell consists of different subcomponents.
- Semi-bipolar plates (Cathode + Anode side)
- Rubber gasket between cells
- Subgasket between bipolar plates
- Gas diffusion layer + Microporous layer
- Membrane electrode assembly

Benchmarking Report Overview

The following reports are available:

M1.1 – Level-1 Benchmark
Level-1 benchmark delivers a first vehicle overview and comparison of key performance indicators within FEV scatter bands.
M2 - Operations & Consumption
Detailed investigation of the Hybrid operation strategy & Energy management
M3 – Fuel Cell System Evaluation
Comprehensive insights into system performance, efficiency and fuel cell operation strategy
M4 – Fuel Cell System Teardown, Design & Cost BMK
M5 - Electric Powertrain Component Teardown, Design & Cost BMK
M6 - Acoustics & NVH
M7 - Powertrain Thermal Management
M8 - Compressor Analysis & Mapping
Compressor benchmarking of aerodynamics, acoustics and electronics
M9 - Fuel Cell Stack Investigation
Fuel Cell stack mapping and efficiency investigations

For further details including content and price, please contact:

MarkLines Co., Ltd., Consulting Services Department
Person in charge: Mr. Usuba
TEL：(03) 4241-3906
FAX：(03) 4241-3900
e-mail：benchmarkdata@marklines.com