Print 20 comment(s) - last by jackpro.. on Apr 17 at 10:29 PM

Top industry figures says there's no sure fire method of predicting internal shorts

For the last two decades demand for lithium ion batteries in mobile devices has exploded, but so did safety concerns.  Apple, Inc. (AAPL), Sony Corp. (TYO:6758) and several others struggled with exploding or smoldering products.

I. Expert Panel -- How to Make Batteries Safer

Now it's the transportation industry that is grappling with these issues.  This week a panel of experts met at a forum sponsored by the U.S. National Transportation Safety Board in a bid to answer the question of how to prevent the wave of battery fires that have swept the electric vehicle and commercial aircraft industries.

The answers were not terribly reassuring.  While experts said the issue of short-circuits was known and best-practice preventive measures were included in most large battery systems, that there's no sure-fire method of protecting a battery from its own internal flaws.  

And the mechanism by which short circuits start fires is still poorly understood.  Laurie Florence, principal engineer at international battery safety certifier UL, says that you can shoot a nail into most lithium ion batteries, triggering a short circuit, but no fire.  However, more subtle internal design issues can trigger short circuits that do lead to fires.

Daniel Doughty, president of Battery Safety Consulting, urged the industry at the forum to embrace research into design isolated cell technology that prevents a fire in one cell from spreading to the next.  He also urged industry leaders to develop better technology to diagnose and predict internal short circuits.

Battery manufacturers already rely on a cruder fault prevention technology -- additives.  The liquid lithium ion fluid -- roughly 25 percent of the contents of a typical cell -- is highly flammable.  Typically additives are mixed into this volatile liquid to reduce the fire risk.  But these additives also frequently reduce the power capacity/delivery of the battery, hence raising costs and cutting battery life.

Janet McLaughlin, deputy director of the U.S. Federal Aviation Administration's hazardous materials safety programs, comments, "We all know lithium batteries are hazardous materials."

On the other hand, replacing batteries also isn't cheap.

II. Battery Fires Hit Boeing, GM, Hard

Both Airbus, a subsidiary of The European Aeronautic Defence and Space Company N.V. (EADS) (EPA:EAD), and The Boeing Company (BA), the world's top two commercial aircraft companies, initially tapped lithium ion batteries for auxiliary power systems in their new flagship aircraft, an industry first.  Airbus recently dropped plans for lithium ion batteries in its upcoming A350 after backpedalling amid fire concerns.

Those concerns allude to rival Boeing's efforts, which are still forging ahead despite major setbacks.

In January the battery module in the Dreamliner 787 caught fire in Boston, Mass. while on the ground.  Just a couple weeks later, a Dreamliner in Japan was struck by a serious battery fire.  After the second incident Boeing agreed to ground the Dreamliner and search for a solution.

Boeing 787 production line [Image Source: Boeing]

Since then, Boeing has redesigned the battery module.  And while an investigation into the previous fires is still ongoing, the FAA has agreed to permit Boeing to start testing the new module.

The auto industry has also been struggling with battery issues of its own.  Fisker suffered a pair of fires last year, although the company insists they weren't battery related.  But General Motors Comp. (GM) did trace fires in its Chevy Volt electric vehicle back to malfunctions, triggering a quasi-recall.  In the aftermath of the recall GM executives were forced to testify before Congress.  GM recently acknowledged that the publicity from the fires hurt Volt sales.

Chevrolet Volt [Source: TECHVEHI]

But again, in automotive applications automakers are struggling with the delicate game of risk regarding batteries and additives.  Fewer additives might give customers more miles on a charge -- but they might also cause a fire.

III. Soft Demand Tempts Some to Cut Corners

A final issue is soft demand.  The struggles of electric vehicles -- caused in part by poor battery range and public awareness of battery safety issues -- have cause the industry to badly miss sales growth predictions.

In 2002 only 800m lithium ion cells shipped.  This year roughly 5.5 times that total -- 4.4b cells -- shipped.  Glen Bowling, vice president of sales at Saft Specialty Battery Group, a producer of lithium ion batteries, comments to Reuters, "The growth in the mission of lithium-ion batteries is substantial. It's a stretching of the technology boundaries and we have to be professional when we do that."

But the industry is also hurting.  Massachusetts Institute of Technology materials engineering professor Yet-Ming Chiang comments, "[2008-era predictions of 2011 demand] were off by more than a factor of 10.  This created a great deal of stress among those who manufacture batteries.

Battery product
LiIon battery-makers have been under increasing financial stress amid missed sales targets.
[Image Source: ANL]

Those miscalculations have caused manufacturers and startups to load up on expensive lithium metal and overproduce.  Professor Chiang says there's enough idle lithium cell stock to power 400,000 LEAF EVs from Nissan Motor Comp., Ltd. (TYO:7201).

Many companies have gone out of business.

Amid that market it may be tempting to the survivors to cut corners.  Survivors are desperate that Congress will back a fresh round of $7,500 to $10,000 USD electric vehicle tax credits proposed by President Obama to stimulate asales.

Sources: NTSB, Reuters

Comments     Threshold

This article is over a month old, voting and posting comments is disabled

New technology needed
By yik3000 on 4/12/2013 4:00:37 PM , Rating: 2
IMO we need a new battery technology desperately. I often read some post about awesome material that can make battery greener, thinner, lighter, holds more charge, recharge faster, last longer...wonder when those goodies will ever make it to the consumer market.

RE: New technology needed
By kmmatney on 4/12/2013 5:35:59 PM , Rating: 2
For it's purpose (to provide better gas mileage) the old NiMH battery in the Prius was pretty awesome. I was really surprised by this consumer reports study:

Battery life cycle As the Prius reached ten years of being available in the U.S. market, in February 2011 Consumer Reports decided to look at the lifetime of the Prius battery and the cost to replace it. The magazine tested a 2002 Toyota Prius with over 200,000 miles on it, and compared the results to the nearly identical 2001 Prius with 2,000 miles tested by Consumer Reports 10 years before. The comparison showed little difference in performance when tested for fuel economy and acceleration. Overall fuel economy of the 2001 model was 40.6 miles per US gallon (5.79 L/100 km; 48.8 mpg-imp) while the 2002 Prius with high mileage delivered 40.4 miles per US gallon (5.82 L/100 km; 48.5 mpg-imp). The magazine concluded that the effectiveness of the battery has not degraded over the long run.[127] The cost of replacing the battery varies between US$2,200 and US$2,600 from a Toyota dealer, but low-use units from salvage yards are available for around US$500.[127] One piece of research indicates it may be worthwhile to rebuild batteries using good blades from defective used batteries.[128]

"A lot of people pay zero for the cellphone ... That's what it's worth." -- Apple Chief Operating Officer Timothy Cook

Copyright 2016 DailyTech LLC. - RSS Feed | Advertise | About Us | Ethics | FAQ | Terms, Conditions & Privacy Information | Kristopher Kubicki