2023 Lexus RZ 450e

The 2023 Lexus RZ 450e is an interesting if perhaps unremarkable offering in terms of the battery pack.

The Lexus RZ shares the platform with the Toyota BZ-4X.

This post has been built based on the support and sponsorship from: About:Energy, AVANT Future Mobility, Quarto Technical Services, TAE Power Solutions, h.e.l group and The Limiting Factor. 

Specifications:

Pack

• total energy = 71.4kWh
• usable energy = 63.4kWh
  • Usable SoC = 89%

A quite conservative usable versus total pack energy. The Mercedes EQA 250 with 66.5kWh usable (69.7kWh total) is smaller total energy content, but even so the customer gets an extra 3kWh of usable energy.

• peak discharge power 255kW_10s (230kW motor power and assumed 90% efficiency) 
• continuous power [kW]
• nominal voltage = 355.2V
• capacity = 201Ah
• voltage range = V to V
• weight = 481kg
  • cells = kg
• volume pack = litres
• pack dimensions
• number of cells = 96
  • 96s
  • 1p

The design of the pack is flat and rectangular with just 4 modules, this pack is as good as or better than the Tesla Mode 3 for simplicity.

• cooling system = cooling plate with water+glycol

Module

• Module appears to be full pack width with 24 prismatic cells in each module.
• 4 modules in a pack.

Cell

• cell make and model
  • Panasonic 201Ah Prismatic
  • Nominal voltage = 3.7V
  • Capacity = 201Ah
  • 308mm x 39.8mm x 103mm

Note: if you have a specification sheet for this cell please do drop us a line: nigel@batterydesign.net

Key Pack Metrics:

• Gravimetric energy density, pack = 148Wh/kg
  • Cell = Wh/kg
• Volumetric energy density, pack = Wh/litre
  • Cell = 589Wh/litre
• Gravimetric power density, pack = 531W/kg_10s
• Volumetric power density, pack = W/litre_10s
• Estimated cost = $/kWh
• Cell to Pack mass ratio
  • module to pack mass ratio = %
• Cell to Pack volume ratio

Other key features:

• Safety
• BMS
• HV Distribution
• HV and LV Connections
• Cooling Connections
• Structural / non-structural pack
• Case material
• Sealing strategy
• Venting strategy
• Durability
  • 90% of the battery capacity to be retained after 10 years
• Availability
• Recycling
• Shipping

References

1. EV battery cell design-taking Toyota bZ4X as an example, Tycorun Energy
2. Toyota bZ4X Battery To Retain 90% Capacity After 10 Years, InsideEVs