2021 Mercedes EQA 250

Specifications:

Mercedes EQA

The 2021 Mercedes EQA 250 is an all electric compact SUV.

Traditional layout with a single motor driving the front wheels and a battery pack under the passenger compartment.

  • total energy = 69.7kWh
  • usable energy = 66.5kWh
  • peak discharge power = 156kW10s 

Peak discharge power is estimated based on peak motor power of 140kW and a motor and inverter efficiency of 90%, hence 140kW / 90% = 156kW

  • continuous power kW
  • nominal voltage = 367V
  • capacity = 190Ah
  • voltage range = V to 420V
  • weight =kg
    • cells = kg
  • volume pack = litres
  • pack dimensions =
    • module =
  • number of cells = 200
    • 100s
    • 2p
  • cell
    • make and model = CATL
    • Format = prismatic
    • Nominal voltage = 3.67V
    • Nominal capacity = 95Ah
2021 Mercedes EQA battery
  • charge time = 10 to 80% in 30 minutes
    • 100kW charge power
  • modules:
    • 5 modules
  • cooling system = liquid (water-glycol)
    • Heat Pump
    • If Navigation with Electric Intelligence is activated, the battery may also be pre-heated or cooled while driving in order to ensure that it is within the ideal temperature window for a rapid charging station.
    • Use of waste heat from the high-voltage battery: if the temperature of the battery rises above a defined threshold value, the waste heat can be used to heat the interior.
  • pack cost =

Key Pack Metrics:

  • Gravimetric energy density, pack = Wh/kg
    • Cell = Wh/kg
  • Volumetric energy density, pack = Wh/litre
  • Gravimetric power density, pack = W/kg10s
  • Volumetric power density, pack = W/litre10s
  • 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
    • Connections at the front of the pack in traditional bulkhead tunnel area
  • Cooling Connections
  • Structure = non-structural pack
    • The battery housing is part of the vehicle structure and thus an integral part of the crash concept.
2021 Mercedes EQA battery

There appears to be significant structure and distance between the side rails of the body and the first battery cell. The battery layout is complex and doesn’t appear to be very well optimised for cost:

  1. two orientations of the cells
  2. double layer of modules
  3. complex base and lid
Mercedes EQA 250
  • Case material
    • Base and rails aluminium
  • Sealing strategy
  • Venting strategy
  • Durability
  • Warranty
    • 160,000km or 8 years
    • certificate also covers capacity loss
  • Availability
  • Recycling
  • Shipping

References

  1. Mercedes EQA Technical Data – the manufacturers own technical data, very limited.
  2. Mercedes Group Media – the EQA 250
  3. EV Database EQA250
  4. Technology of the new EQA – Mercedes

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