cycleops612
10 kW
Unless u r good at skimming, i am not suggesting u read
http://ntnu.diva-portal.org/smash/get/diva2:174476/FULLTEXT01.pdf
Its a v hi brow thesis, but it has moments of concise clarity to we mortals.
~
" “Cascade multilevel converter in hybrid electric vehicles,”"
sadly i cant paste pertinent bits.
He puts the problem/point i am sorta on about, far better than i can. We agree it seems, that "cascade" is a good term for it. Its what i searched on~.
my simple version is:
Storage is clearly THE issue for EVs, and huge R&D resources are dedicated to eking improvements from the various deeply flawed options.
But little thought is given to cleverly combining strengths and weaknesses of various power sources to average out into a nice, usable power source for an ev. The paradigm is predominantly one storage technology onboard.
A Prius is an apt hybrid. But why stop there? Why not a plugin with a tiny ICE motor generator or fuel cell (little more than on onboard charger/~minimal base load - say 20-30% of full throttle power capability) AND; 10% lipo, 5% supercap, 40% limn, 45% lifepo4 (easily customised for users needs).
Bulk up on the good enough for normal power batterys, and hang the expense for a little turbo power in the mix.
Unlimited range for non extreme use (like hour after hour of full throttle on the freeway w/ no fast charging points) and similar squirt to a motor car.
more to the point, a pure EV needs variously; range, peak power (a c-rate of 2-3 seems right), affordable, light,...
All qualities which vary greatly with different storage types. A clever controller would allow use of several types, each rubbish if used alone, to combine into a cost effective ~ideal battery.
One thing all chemistries hate, is being taxed at their limits - its a chemical reaction, not a switch. This hybrid cascade approach would help.
I understand being clever with big levels of power is fraught, but at lower levels such as modest ebikes and EVs, i get the impression all sorts of power massaging is possible efficiently~ these days?. ~historically recent advent of mosfets?
Perhaps multiple controllers is a simplifying DIY paradigm, one cheap mainstream controller feeds into another, to even out power incompatibilities - say to combine some lipo with some li-mn (seems a good hybrid to me for burst c-rates as well as affordable range and longevity from the main storage investment).
another combo is limn & lifepo4. One is light & the other no voltage sag - you can get usable power when 80% empty, by supplementing it from another source before feeding it to the motor.
I gather combining wind and solar power requires this?
Clearly I am an E-noob.
Where am i wrong?
Discuss.
http://ntnu.diva-portal.org/smash/get/diva2:174476/FULLTEXT01.pdf
Its a v hi brow thesis, but it has moments of concise clarity to we mortals.
~
" “Cascade multilevel converter in hybrid electric vehicles,”"
sadly i cant paste pertinent bits.
He puts the problem/point i am sorta on about, far better than i can. We agree it seems, that "cascade" is a good term for it. Its what i searched on~.
my simple version is:
Storage is clearly THE issue for EVs, and huge R&D resources are dedicated to eking improvements from the various deeply flawed options.
But little thought is given to cleverly combining strengths and weaknesses of various power sources to average out into a nice, usable power source for an ev. The paradigm is predominantly one storage technology onboard.
A Prius is an apt hybrid. But why stop there? Why not a plugin with a tiny ICE motor generator or fuel cell (little more than on onboard charger/~minimal base load - say 20-30% of full throttle power capability) AND; 10% lipo, 5% supercap, 40% limn, 45% lifepo4 (easily customised for users needs).
Bulk up on the good enough for normal power batterys, and hang the expense for a little turbo power in the mix.
Unlimited range for non extreme use (like hour after hour of full throttle on the freeway w/ no fast charging points) and similar squirt to a motor car.
more to the point, a pure EV needs variously; range, peak power (a c-rate of 2-3 seems right), affordable, light,...
All qualities which vary greatly with different storage types. A clever controller would allow use of several types, each rubbish if used alone, to combine into a cost effective ~ideal battery.
One thing all chemistries hate, is being taxed at their limits - its a chemical reaction, not a switch. This hybrid cascade approach would help.
I understand being clever with big levels of power is fraught, but at lower levels such as modest ebikes and EVs, i get the impression all sorts of power massaging is possible efficiently~ these days?. ~historically recent advent of mosfets?
Perhaps multiple controllers is a simplifying DIY paradigm, one cheap mainstream controller feeds into another, to even out power incompatibilities - say to combine some lipo with some li-mn (seems a good hybrid to me for burst c-rates as well as affordable range and longevity from the main storage investment).
another combo is limn & lifepo4. One is light & the other no voltage sag - you can get usable power when 80% empty, by supplementing it from another source before feeding it to the motor.
I gather combining wind and solar power requires this?
Clearly I am an E-noob.
Where am i wrong?
Discuss.