It's flipping the hybrid script: instead of using electric for low demand and gas for more juice, it's electric for the main power and gas just for the battery.
This puts the heavy lifting on the 90% efficient powertrain and eases up on the super inefficient 25% one.
Toyota should've been all over this back in 2015.
METI (the Japanese Ministry that develops Japan's R&D strategy) is hesitant about using lithium ion battery technology due to lithium dependency issues and memories about the impact the 1970s oil shock had on Japan [0][1], along with IP issues.
This is why Japan has been pushing it's domestic champions to research Hydrogen Fuel Cells [2] and solid state batteries [3]
This is also the strategy that Toyota adopted [4][5].
[0] - https://www.sojitz.com/history/en/era/05/
[1] - https://www.ide.go.jp/library/English/Publish/Periodicals/De...
[2] - https://www.meti.go.jp/shingikai/enecho/shoene_shinene/suiso...
[3] - https://www.meti.go.jp/english/report/pdf/0520_001a.pdf
[4] - https://global.toyota/en/newsroom/corporate/39330548.html
[5] - https://global.toyota/en/newsroom/corporate/39330500.html
This means the only options long term are Hydrogen and Sodium Solid State.
I'd recommend reading the Japanese government docs and presentations I linked above as they explain why Japan and it's companies are doing what they are doing.
https://cen.acs.org/materials/inorganic-chemistry/Can-seawat...
And natural gas; it's clear from https://www.meti.go.jp/shingikai/enecho/shoene_shinene/suiso... that the plan is to get hydrogen from natural gas, with electrolysis as a thin renewable figleaf over the issue of CO2 emissions.
(don't trust any source that describes hydrogen as an "energy source". There is no naturally occurring hydrogen reserve. It is not a source.)
They might be in a better place if TEPCO hadn't messed up their nuclear plant designs in a tsunami zone.
Did you take into consideration optimal load efficiencies? What about the total cost of ownership for the energy conversion from ICE?
In 2015, hybrids were already well optimised for the current technology limitations.
Lohner–Porsche is a term encompassing several electric vehicles designed by Ferdinand Porsche and manufactured at Lohner-Werke in the early 1900s. They include the first hybrid electric vehicle and the first commercial hub motor car. The hybrid "Mixed" or "Mixte" racecars are powered by a gasoline engine which drives four electric motors, one in each wheel hub. The battery-powered "Touring" or "Chaise" commercial cars utilize only two front-wheel hub motors.