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Lead-Acid Batteries Seek New Role in Hybrids, Plug-Ins
9/10/2012

Energy Power Systems (EPS) proposes replacement of a 16-kWh lithium-ion battery, like the one in the Chevy Volt, with a 9-kWh lithium pack and a high-power, 3.5-kWh lead-acid pack.   (Source: EPS)
Energy Power Systems (EPS) proposes replacement of a 16-kWh lithium-ion battery, like the one in the Chevy Volt, with a 9-kWh lithium pack and a high-power, 3.5-kWh lead-acid pack.
(Source: EPS)

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Jerry dycus
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Gold
Re: Tackling the real problem
Jerry dycus   9/11/2012 11:03:35 AM
NO RATINGS
 

 Naperlou,, That's just what I've been saying for yrs.  Start with reliable tech and then do what you are paid for, design a car around it that makes it work as a system.

 

Lead is a great battery, very cost effective when designed right.  I'm about to go pick up some construction supplies in my lead powered Harley size EV trike pulling it's 14' trailer.

Fact is a 500lb composite 2 seat commuter/town car EV with 500lbs of quality lead deep cycle batteries can go 80mph and 100 mile range, though not at the same time, and be built for under $12k with a nice profit.  But as these are not profitable, no rust, few parts to go bad, after the sale big auto and especially big oil hates them.

That said strings of 30 12vdc lead batteries in the article needs a BMS to keep them alive so if a li hybrid battery system now you need 2 complete battery BMS, etc plus cordinating electronics, it's better to replace the li battery with a small ICE like the Toyota X-1 though with lead, to give unlimited range.

Better is fewer cells, lower voltage like 100-120vdc of lead. Since a lightweight, very aero EV needs little power to go a mile one needs a much smaller battery pack to get decent range. My earlier EV sportwagon got 10 miles/kwhr or better. My Trike gets 20miles/kwhr shows what can be done.

 Using forklift EV drive tech gives excellent performance at a reasonable cost.

EV's are selling. the Volt is not an EV but a hybrid, if they were not overweight, overteched, overpriced, they would sell.

As for battery life, lead with a good BMS will last 5-7 yrs then only needs to be rebuilt as almost 100% of them are recycled into new batteries.  So one could just pay a reforming charge as no new materials are needed and have a new pack.

It's amazing how so many throw up such misinformation about how EV's can't work or limited when there are simple solutions.

So keep paying at the pump as it rises to $10'gal in 5 yrs. It only costs me a couple $/month for my transport fuel and I don't support oil dictators or terrorists it pays for. 

oldtimer8080
User Rank
Gold
Been There, Done That
oldtimer8080   9/11/2012 12:13:11 PM
NO RATINGS
Bolder Technologies was offshored due to fact that the executives wanted to cash out their options. 

http://www.boldertmf.com

http://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=2&ved=0CCgQFjAB&url=http%3A%2F%2F144.206.159.178%2Fft%2F641%2F20447%2F369080.pdf&ei=b2FPUO3ROuHRyAGWuIDYBA&usg=AFQjCNGy0lHKil1dNn61Z3pZrHb73wTrfw&sig2=1jZp5ZQ6u6VX4HDSCPHReQ

We had a viable technology worked out, we even had a military contract for energy cells and we had already powered the series hybrid Intrepid ESX:

http://www.allpar.com/model/intrepid-esx3.html

We also powered the first Killacycle. When not breaking records, Bill let us display it in the Bolder Technology lobby.

www.killacycle.com

We see a series hybrid that works every time  you watch a locomotive.

The " start stick " for aircraft and the SecureStart for automobiles used the TMF energy cells.

Just imagine what could have been a product that was built in the US and used by the military for light and powerful belt packs.

 

 

Jim_E
User Rank
Platinum
Actual Chevy Volt Cost
Jim_E   9/11/2012 12:18:45 PM
NO RATINGS
I'm not a big fan of the Volt, but I have to stick up for GM on this one.  The article stating the per-unit lost on the Volt is incorrect.

Here's an article which better explains that way that the cost is actually calculated:

http://www.forbes.com/sites/boblutz/2012/09/10/the-real-story-on-gms-volt-costs/

 

It appears that GM isn't doing too badly on the Volt after all, as long as they end up selling enough of them....

 

phillman5
User Rank
Iron
Re: Volt battery pack cost?
phillman5   9/11/2012 12:29:23 PM
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The loss of $49K per Volt was poor analysis.  That number is assuming all the cost are recovered in the first year, not spread out over production life.

Contrarian
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Gold
Re: Volt battery pack cost?
Contrarian   9/11/2012 1:47:29 PM
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phillman5: That number is assuming all the cost are recovered in the first year, not spread out over production life.

What is the typical development amortization period for a production car?  Seems you'd need an apples-apples comparision for a fair appraisal.


Ralphy Boy
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Platinum
Re: Actual Chevy Volt Cost
Ralphy Boy   9/11/2012 6:27:15 PM
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I'm not sure about the math on this one... A bit of 'could you double check that math' is going on...

"Dhar says he could replace the 16-kWh lithium-ion battery in the Chevy Volt with a 3.5-kWh lead-acid battery and a 9-kWh lithium-ion pack. Doing so, he believes EPS could cut the battery pack cost of a Chevy Volt from approximately $12,800 to under $6,000."

So... 16kwh Li = $12,800 ($800/kwh-Li)

but... 9kwh Li + 3.5kwh Lead = $6,000? ($555/kwh-Li assuming $1000 for the lead/integration)

Am I missing something?

Charles Murray
User Rank
Blogger
Re: Actual Chevy Volt Cost
Charles Murray   9/11/2012 6:51:49 PM
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RalphyBoy, you've raised a great question that I should have asked. I'll get an answer for you.

Jerry dycus
User Rank
Gold
Re: Been There, Done That
Jerry dycus   9/11/2012 10:39:01 PM
NO RATINGS
 

Yes Bolder was a great tech but while putting amazing power, it wasn't likely to live long from not being able to keep them balanced.  But in larger sizes say 70-100amphr cells with a decent BMS and you'd have  serious EV battery pack material.

  IIRC Bolders were only  2-3amphr cells  made for cordless power tool battery packs. I like them there better than NiCads!!  I remember Bill using them in his Killacycle drag bike hitting 8 second 1/4 mile times or so with them.

Facts are the better you design the battery to get power in, out as fast as possible like the Bolder, Optima and Orbital lead batteries have and you get excellent specific power and if you don't starve it of electrolyte and make it refillable you get more range and life.

Sadly most lead battery companies skimp on the interconnects raise cell resistance, etc, just to save a few cents!!

On my belt pack I have to carry I want Lithium!! Same power at 1/2 the weight!!

Interestingly the best lead batteries are about the lowest cost/lb like golfcart or true deep cycle traction batteries by good companies like Deka/East Penn, Trojan, USBattery.  Going rate about $1.30/lb.  So the 500lb battery pack for my example for 100 mile range costs only $700 or about $100-$140/yr

Jerry dycus
User Rank
Gold
Re: Actual Chevy Volt Cost
Jerry dycus   9/11/2012 10:53:33 PM
NO RATINGS
First the pack is smaller in amphrs and likely in space because lower  output lithium batts have a better wthr/lb by about 50%  and generally cost less than high output ones.

Thus why having a hybrid pack helps  by the lead batteries taking the power spikes, both acceleration and regen while being steadily charged by the lithium pack.

But I fail to see how with a smaller total amphr it can't lose EV range.

Interestingly just by switching the body to composites and cutting the engine down to 30hp range would about double from the weight savings!!

As for cost we have been buying EV size lithium cells for $450/kwhr for a couple yrs retail so I don't expect it's costing GM even that. Add $100/kwhr for making it into a pack and BMS and you are at $550/kwhr.

oldtimer8080
User Rank
Gold
Re: Been There, Done That
oldtimer8080   9/11/2012 11:48:15 PM
NO RATINGS
The original sub-c energy cell was rated for ~1 A/Hr with a discharge rate at 400 AMPS!  That gave the Secure Start ( sold at Sears for the replacement for jumper cables in the trunk ) and the original Start Stick for aircraft  the power. The cells could be recharged in minutes or seconds if you had the power generation capability...NO heat was generated during the charge/discharge cycle!

We had got the internal resistance and interconnects down to  extremely low resistive levels by using wire braid on the cells interconnect system.  Internal resistance was the problem with lead-acid technology; we had solved it with the TMF process and special  winding machines.

As an aside, ROAR ( the R/C car association ) BANNED the Bolder Energy packs due to the power output they had. I still have a couple of the Bolder TMF R/C packs and the " energy cube " we made ( I'm looking at one now ) as well as my original SecureStart given to the employees as a Christmas Bonus....

I also was contacting the high power audio market to replace the capacitors used for smoothing the high current spikes of the multiple KILOWATTS of the car audio systems at that time.

I was thinking of the actual BATACITOR we created that was in SciFi literature of the time.

The military project was to build a 5 A/Hr energy cell that could be carried like a old fashioned cartridge belt you saw in the westerns. We were in the testing mode for these new energy cells when the company was outsourced. I know because I ran the Test Lab.

I had also worked on the Killacycle powerpack and " loaned " my XJ12 to test the product that became the SecureStart. That is how I got the 400 A figure. 

On another robotics project, we worked on " intellegent forklifts " that could have their weight cut in half if Bolder Technology was still around.

One of the speculations I had was about the locomotives being able to use Bolder energy packs and the traction motors to save all the energy they wasted throwing away all that energy in the huge resistor grids on the top of the locomotives. That could save on the Diesel fuel consumption locomotives have.

The " what if " means that this conversation would have been happening over fifteen years ago.

 

 

 

 

 

 

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