论文标题
使用热开关和自动加热的电池极端充电
Extreme fast charging of batteries using thermal switching and self-heating
论文作者
论文摘要
与汽油的加油时间相比,电动汽车的长时间充电时间是大规模采用电动汽车的主要障碍。目前,电动汽车(例如具有快速充电功能的特斯拉)的充电时间为30分钟。为了获得可比的充电体验,作为汽油车,政府和汽车公司的电动汽车已设定了<15分钟,500个周期是电动汽车的极端快速充电(XFC)的目标。使锂离子电池(LIBS)XFC的最大挑战之一是避免锂电池。尽管正在进行大量研究以启用XFC,但主流商业Libs仍未出现任何有希望的技术/策略。在这里,我们通过XFC的主动热开关(即,在XFC期间保持电池热量,开关以增强动力学,以避免锂电池在XFC时散发热量,而在XFC散发XFC时,请在XFC耗散XFC的同时,开关以减少侧面反应。我们提出的TMCP策略可以使商业高能密度的XFC XFC,充电时间<15分钟和> 500个周期,同时击败美国能源部设定的其他目标(排放能量密度> 180 WH/kg> 180 WH/kg,容量损失<4.5%)。此外,我们根据形状内存合金开发热开关,并证明将TMCP整合到商用电池热管理系统中的可行性。
The long charge time of electric vehicles compared with the refueling time of gasoline vehicles, has been a major barrier to the mass adoption of EVs. Currently, the charge time to 80% state of charge in electric vehicles such as Tesla with fast charging capabilities is >30 minutes. For a comparable recharging experience as gasoline vehicles, governments and automobile companies have set <15 min with 500 cycles as the goal for extreme fast charging (XFC) of electric vehicles. One of the biggest challenges to enable XFC for lithium-ion batteries (LIBs) is to avoid lithium plating. Although significant research is taking place to enable XFC, no promising technology/strategy has still emerged for mainstream commercial LIBs. Here, we propose a thermally modulated charging protocol (TMCP) by active thermal switching for XFC, i.e., retaining the battery heat during XFC with the switch OFF for boosting the kinetics to avoid lithium plating while dissipating the heat after XFC with the switch ON for reducing side reactions. Our proposed TMCP strategy enables XFC of commercial high-energy-density LIBs with charge time <15 min and >500 cycles while simultaneously beating other targets set by US Department of energy (discharge energy density > 180 Wh/kg and capacity loss < 4.5%). Further, we develop a thermal switch based on shape memory alloy and demonstrate the feasibility of integrating our TMCP in commercial battery thermal management system.