13 Window on 2040-cars

Auto blog

VW decides against active-cooling system for e-Golf lithium battery

When the 2015 VW e-Golf was introduced at the LA Auto Show last year, VW said it would come with a water-cooled battery. During the Detroit Auto Show, when the car was trotted out again, VW released a new press release that stripped out the "water-cooled" language, but this change went unnoticed. During a recent VW event in Germany, a friend from Green Car Reports realized that the battery on display did not seem to have any water-cooling mechanisms. That set us off on a bit of a sleuthing and we have now learned that VW is not going to include any active cooling in the upcoming e-Golf. In fact, the company is entirely confident that this car - because of what it's designed to do - doesn't need it. "The need for a cooling system wasn't there" - VW's Darryll Harrison VW has been working on an electrified Golf for ages now, and so changes to the plan are to be expected. But battery cooling is vitally important not just to keep the car operating properly but because when things get too hot, there can be serious public relations problems. Nissan began testing a new battery chemistry for the Leaf in 2013 after an uproar from warm-weather EV drivers in Arizona who were experiencing worse-than-expected battery performance. The Leaf has always used an air-cooled battery, which is another way to say that there is no active cooling system (more details here). Tesla CEO Elon Musk once said this approach is "primitive." So, why is VW following the same path? We asked Darryll Harrison, VW US's manager of brand public relations west, for more information, and he told AutoblogGreen that VW engineers discovered through a lot of testing of the Golf Mk6 EV prototypes, that battery performance was not impacted by temperatures when using the right battery chemistry. That chemistry, it turns out, is lithium nickel manganese cobalt oxide (NMC) in cells from Panasonic. These cells had "the lowest self-warming tendency and the lowest memory effect of all cells tested," Harrison said. He added that VW engineers tested the NMC cells in places like Death Valley and Arizona and found they didn't warm very quickly either through operation, charging (including during fast charging) or through high ambient temps. "The need for a cooling system wasn't there," Harrison said.

VW joins Daimler's protest of new A/C refrigerant as EU deadline for compliance passes

The case of Dupont and Honeywell's refrigerant R-1234yf is doing the exact opposite of keeping things cool. The two chemical companies have spent years and hundreds of millions of dollars developing R-1234yf to replace R-134a, the new refrigerant shown to be 99.7-percent kinder to the environment than the one it is meant to succeed. Part of that development has been years of testing by governments, outside safety agencies and automakers to approve the chemical for use in cars. It passed the protocols necessary for the European Union to declare that new and significantly revised cars from 2013 onward needed to use R-1234yf, and mandated that every car as of 2017 must use it.
Enter Daimler AG. The automaker created a head-on collision test with a B-Class at their Sindelfingen test track that would lead to the pressurized refrigerant being sprayed on the engine. The result in 20 out of 20 test was that the refrigerant burst into flames as soon as it hit the hot engine, while Daimler says that R-134a does not catch fire in the same test. Another unexpected result of the R-1234yf test was the release of hydrogen flouride, a chemical far more deadly to humans than hydrogen cyanide, emitted in such amounts that it that turned the windshield white as it began to eat into the glass.
Said a Daimler engineer in a Reuters piece, "It was scarcely believable. The most complicated lab tests conducted using the most sensitive measuring instruments around found nothing and all we do is drive a car around a couple of times, open a tiny hole in the refrigerant line and the next thing you know the car is on fire." So Daimler said it wouldn't use the refrigerant, and it recalled the cars it had already shipped with R-1234yf.

Automakers face reality of EVs' cost — to jobs, and their bottom line

Related: We obsessively covered the Frankfurt Motor Show — here's our complete coverage FRANKFURT, Germany — European car bosses gathering for the Frankfurt auto show are beginning to address the realities of mass vehicle electrification, and its consequences for jobs and profit, their minds focused by government pledges to outlaw the combustion engine. As the latest such announcement by China added momentum to a push for zero-emissions motoring, Daimler, Volkswagen and PSA Group gave details about their electric programs that could give policymakers some pause. Planned electric Mercedes models will initially be just half as profitable as conventional alternatives, Daimler warned — forcing the group to find savings by outsourcing more component manufacturing, which may in turn threaten German jobs. "In-house production is almost irrelevant to the consumer," Daimler boss Dieter Zetsche told reporters on the eve of the Frankfurt Motor Show, in the midst of a German election campaign in which automotive jobs have loomed large. The company set a target of saving 4 billion euros ($4.8 billion) by 2025 to help fund the cost of its electric cars. "Daimler is the first company to state explicitly how much electric vehicles are going to hurt margins," said Bernstein analyst Max Warburton. "It was brave to go first — but of course it won't be the last." Volkswagen, for its part, said it was seeking new global supplier contracts to source 50 billion euros ($60 billion) of electric car content including batteries, which are not yet manufactured competitively in Europe. "A company like Volkswagen must lead, not follow," Chief Executive Matthias Mueller told reporters. VW diesel emissions-cheating exposed by U.S. regulators in 2015 triggered global public outrage, dozens more investigations into test-rigging by the wider industry and a push by some lawmakers to ban diesel and eventually all engines. TIGHTENING NOOSE Tesla shares jumped nearly 6 percent on Monday after a Chinese minister said it was a question of when, not if, Beijing bans fossil-fuel cars, tightening the noose around the combustion engine. France and Britain have promised its outright abolition by 2040. But PSA, the maker of Peugeots and Citroens, said it was concerned about the risks if consumers were left behind in the rush, and a new generation of battery cars does not sell.