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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.

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We're set to record Autoblog Podcast #366 tonight, and you can check out the topics below, drop us your questions and comments via our Q&A module, and don't forget to subscribe to the Autoblog Podcast in iTunes if you haven't already done so. To take it all in live, tune in to our UStream (audio only) channel at 10:00 PM Eastern tonight.
Discussion Topics for Autoblog Podcast Episode #366
2015 Lincoln Navigator

2015 Volkswagen e-Golf

Until now, the only way you could get the words "electric" and "Golf" so close together was the put the word "cart" after them. Knowing that the e-Golf would be the next step in Volkswagen's tilt at electrification, the automaker designed the MkVII platform to fit a myriad of drivetrains, none of which would require purchasers to sacrifice the Golf-ness that makes the best-selling car in Europe, not to mention a huge hit here in the States. In the e-Golf that means power electronics underhood and an amoeba-shaped battery that fits in the floorpan, between the axles, where it won't ooze into the interior space. We look at the e-Golf as another kind of crossover: traditional cars that just happen to be electric, offering a taste of the new EV religion in soothing, recognizable garb. We had one for a week in its natural habitat, Los Angeles and the surrounding area. We really like the fact that, powertrain aside, it maintains everything we dig about the Golf. The caveat is that this is an EV first and a Golf second – you must first address the EV challenges and live within EV constraints, then you can enjoy the Golf bits. Even so, it's the electric car this writer would buy once we acquired the lifestyle to make proper use of it. The most noticeable exterior change to the e-Golf are 16-inch Astana wheels wrapped in 205-series tires that reduce rolling resistance by ten percent. Once you've cottoned on to that, the other alterations become apparent: the blue trim strip underlining the radiator grille, the redesigned bumper with the C-shaped decoration LED lights and the full-LED headlamps above them, the little blue "e" in the model name on the rear hatch. You won't notice the underbody paneling, that the frontal area of the e-Golf is ten percent smaller than that of a traditional Golf, that the radiator is closed off, or the reshaped rear spoiler and vanes on the C-pillars. Volkswagen says this results in a ten-percent drop in drag, getting the coefficient down to 0.281, but the standard Golf is also listed at 0.28. The TSI and TDI are 0.29. No matter those numbers, the point is the e-Golf looks just like... a Golf. The 12,000-rpm, 85-kW electric motor equates to 115 horsepower and 199 pound-feet of torque, which compares to 146 hp and 236 lb-ft from the 2.0-liter diesel Golf. It takes 4.2 seconds to get to 37 miles per hour, 10.4 seconds to hit 62 mph, and the little guy tops out at 87 mph.