![]() Rivian relies on Samsung SDI for its supply of 2170 cells. The Lucid Air is using 2170-format cells supplied by Samsung SDI in the initial Dream Edition, then “next-generation” cells from LG for the Grand Touring model down through the rest of the lineup. Rawlinson confessed that he’d been rooting for the 2360 (23 mm by 60 mm) size that would have allowed more flexibility versus the 2170 (21 mm by 70 mm) size that Tesla and cell suppliers have settled on as a volume cylindrical cell-as he wanted to make the cabin floors 5 mm lower, not 5 mm higher. “So if you make one bigger, it’s cheaper.” “The case of a cylindrical cell is disproportionately more expensive to make than the core, than the jelly roll,” he summed. ![]() Lucid is proud of how the Air’s pack isn’t a squared-off brick the pack is specially contoured to support the sedan’s excellent 0.21 coefficient of drag.įuture Tesla cell will make energy, power gains It also means not being bound to the design constraints of larger cells. Some of these preferences-and the perceived risk level, as some see it-could feasibly change later in the decade, in a shift to solid-state cells.Īs Rawlinson has explained it in the past, Lucid’s choice of cylindrical lithium-ion cells comes down to thermal attributes and the consistency and reliability of the cells themselves, as well as their predictable cost on the market. ![]() Tesla strongly recommends against their use. Generally agree, but probability of thermal runaway is dangerously high with large pouch cells. Tesla CEO Elon Musk last month was asked about cell form factors and called the probability of thermal runaway “dangerously high with large pouch cells,” and pointed to the physical challenges of cooling them. There's some momentum in a shift the other way, with BMW announcing a focus on prismatic cells, and signs of a shift to unified prismatic cells for the VW Group. Hyundai has also turned to favor pouch-style cells in its E-GMP platform, and it's what Ford plans to use in its F-150 Lightning electric pickup. At its EV day last March, GM executives confirmed that while they’d considered cylindrical cells, large-format pouch cells were their clear choice. According to battery pack lead engineer Andy Oury, the pouch cell approach provides “the fewest number of the largest cells possible.” That meant GM could cut wiring and connectors within the modules, and each of those gigantic 100-Ah cells holds about as much energy as 20 typical cylindrical cells. Car with AA cylindrical batteries - SNL parody, 4/2016
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