Power density W/kg vs Energy density Wh/kg ratio in battery cells

We are learning new battery chemistries, packaging, production, and operational scenarios almost daily. Some of them appear to be 'dead ends' (i.e. press releases are notorious.) Not trying to be difficult but power and energy density are just the tip of a much larger battery problem.

Is there a specific application you have in mind?

Bob Wilson

 

Ok, I have a better idea of what you are after:

• Lower weight - use a higher energy and power density battery ... see Chevy Bolt
• Moderate weight - use a lower energy and power density battery and efficient EV ... see Tesla Model 3 Std Rng Plus
• Higher weight - use moderate energy and power density battery and less efficient EV ... see all but Lucid EVs

Does this match your interest?

If so, I'll cite the EPA sources and we'll have a common set of facts and data to discuss. Works for you?

Bob Wilson

 

It's not just battery chemistry dictating output; the topology of the motor is more the limiting factor with regards to the power drain.

The currently available AC induction motors are specified for longer service life (few moving parts) at the expense of efficiency.

There are some breathtaking advancements in pulsed power supplies, but they're finicky and the sort of thing mass market car buyers will not accept.

https://www.motioncontroltips.com/most-efficient-vehicle-in-the-world-uses-brushless-motors-in-drivetrain/

 

We are probably Several Battery Generations away from the Solid State Battery in a 10 year package of not busting apart. So an answer is you just limp along with your battery constantly on a Charger of you buy a gas vehicle/Hybrid. Maybe the Fiat/Chrysler design hybrid Etorque with a Larger / better battery will get us to the Solid State Battery someday ! I tend to want to leave the motor inside the Transmission be. It would seem the real problem with the modern Lithium battery is the 30,000 gallons of water needed to put the fire out over 12 hours if in a bad wreck. Let alone the EPA involvements !

 

Source: https://insideevs.com/news/557527/tesla-model3-lfp-charging-recommendations/

Tesla is recommending owners of the new Model 3 RWD base model equipped with lithium iron phosphate (LFP) battery cells to charge to 100% on a regular basis.
. . .​

I'm patient with newer or different battery chemistries and systems. My 2019 Model 3 Std Rng Plus battery has its characteristics so I operate the car to minimize the weaker aspects. For example, I only charge to 100% for the first drive of the day. Daily I charge to 68% which provides more than enough charge for chores.

Rather than wish or wait for perfection, use 'good enough' and operate the car to minimize bad things happening.

Bob Wilson

 

GM is the EV leader:
Happily I own TSLA stock.

Bob Wilson

 

Good for you! EVs are not for everyone.

The backlog of Tesla orders suggests there is no shortage of customers. Tesla has increased prices to reduce new orders.

Bob Wilson

 

150 gasoline vehicle car fires in the USA - EVERY DAY

https://cleantechnica.com/2019/06/03/500-gas-car-fires-per-day-can-we-please-get-serious-about-electric-car-battery-fires/

Of the more than 70,000 Chevy Bolt EVs sold *twelve* have been involved in fires.

Stop spamming this website with last year's smear campaign.

 

I agree but after 12 years of Prius ownership, the Prius trolls would not give up but you could wear them down. The troll rantings 'sharpened' our responses. The Prius trolls sold more Prius as we rapidly deflated their FUD. Eventually, they get bored of the cut-and-paste-and-smackdown and wander off.

Bob Wilson