Ultra-fast two-way charging, blade-shaped battery cells for more modularity and safety, optimal weight distribution, better performance and powertrain efficiency: this is basically what the e-GMP platform, which will be launched in 2021 with the SUV Ioniq 5 and Kia CV.
Specific to electric vehicles
The Hyundai group is betting big on electric mobility. For several years now, the Korean manufacturer and its subsidiary Kia have had a series of successes on this path. To the point of affirming this orientation, which has become largely mature, by creating a specific sub-brand borrowed from the Ioniq sedan.
While this predecessor has distinguished itself in the passenger car market by being available in hybrid, plug-in hybrid, and 100% electric, the e-GMP platform is reserved exclusively for the latter architecture completely free of any thermal block.
A bias that facilitates good weight distribution from the outset, with the lightweight lithium pack ideally positioned lower and between the two sets of wheels.
Segments C, D and E
Three separate units thus make up the e-GMP platform, of which the middle one is made up of the battery surmounted at the rear of the charging control unit.
The front wheelset receives the new compact “Power Electric” unit which brings together a powerful electric motor, a transmission system and an inverter whose power module uses silicon carbide (SiC) semiconductors.
For all-wheel drive configuration, a second electric motor relies on the rear wheels. In its periphery stands the bidirectional charging connector.
Extended wheelbase chassis
The 3 units will be attached to a chassis structure with an extended wheelbase and short overhangs, and the length of which will depend on the segment targeted for the vehicle to be built.
In addition to the isolation of the pack during collisions thanks to an ultra-high-strength steel protection cell, and shock-absorbing pads, this architecture allows a wide variety of models to be obtained more quickly. segments C, D and E.
Four years, and the benefit of previous work carried out over the past twenty years, have enabled Hyundai to develop this architecture and the elements it receives.
5 minutes for 100 km of autonomy
“The integrated electrical system includes the world’s first ultra-fast multiple charging (400 V / 800 V) and two-way power transmission,” says Hyundai.
The Korean group had already announced the arrival of 800 V on its future models of electric cars. This will allow it to align on this point the sportiest with the Porsche Taycan, the first production electric car to adopt this voltage. This choice opens up the trendy ranges of the Korean group to ultra-fast charging, at powers of around 300 kW.
However, some essential data is missing to make good comparisons. It’s about a 20-80% recharge in 18 minutes, and 5 minutes to regain 100 km of range. But for what energy capacity of the battery? Information that will be communicated later, as will the exact chemistry of the batteries made up of standardized blade cells that are safer, more modular, and facilitating both the rapid creation of very different packs and their repair.
Towards 500 km of autonomy
The battery system “will turn out, in terms of energy density [NDLR : +10% par rapport aux packs actuels], the most efficient ever offered by Hyundai Motor Group on a production vehicle, ”says the manufacturer, who mentions the benefits of the new cooling system.
Hyundai is not, however, counting on increasing battery capacity alone to cross the psychological threshold of 500 km of range. While maximizing space on board – including luggage – and enhancing passenger safety, the e-GMP platform should provide better performance.
While top speed could improve by 30-70%, regenerative braking would be 33% more efficient compared to current electric motors. Enough to save a few tens of kilometers within the radius of action.
Questions also arise regarding two-way charging. Besides connecting 220 V devices which should be simple, what about the transmission of energy between 2 compatible electric cars which requires more power?
What standard will this functionality be based on? The CCS Combo already selected for electric cars currently marketed by Kia and Hyundai but which should not offer it until 2025? Or a home development?
Either way, this is a first step towards smart grids that is kindling imaginations. In particular concerning the possible place that the next models of the group could play in electrical and domestic production and regulation systems.
23 models to come
It is on this e-GMP platform that the Hyundai group is supporting its program towards one million battery electric vehicles sold worldwide by 2025. Under its different brands, its connected range would then have 23 models structured in this way, initiated by SUVs. Ioniq 5 and Kia CV.