Self-heating li-ion battery could beat the winter woes

"It is a long standing problem that batteries do not perform well at subzero temperatures," said Chao-Yang Wang, William E. Diefenderfer Chair of mechanical engineering, professor of chemical engineering and professor of materials science and engineering and director, Electrochemical Engine Center.  "This may not be an issue for phones and laptops, but is a huge barrier for electric vehicles, drones, outdoor robots and space applications."

Conventional batteries at below freezing temperatures suffer severe power loss, which leads to slow charging in cold weather, restricted regenerative breaking and reduction of vehicle cruise range by as much as 40%, the researchers said in the 20^th of January issue of Nature. These problems require larger and more expensive battery packs to compensate for the cold sapping of energy.

"We don't want electric cars to lose 40 to 50% of their cruise range in frigid weather as reported by the American Automobile Association and we don't want the cold weather to exacerbate range anxiety," said Wang. "In cold winters, range anxiety is the last thing we need."

The researchers, relying on previous patents by EC Power, developed the all-climate battery to weigh only 1.5% more and cost only 0.04% of the base battery.  They also designed it to go from -4 to 32ºF within 20 seconds and from -22 to 32ºF in 30 seconds and consume only 3.8% and 5.5% of the cell's capacity.  This is far less than the 40% loss in conventional lithium ion batteries.

The all-climate battery uses a nickel foil of 50-micrometer thickness with one end attached to the negative terminal and the other extending outside the cell to create a third terminal. A temperature sensor attached to a switch causes electrons to flow through the nickel foil to complete the circuit. This rapidly heats up the nickel foil through resistance heating and warms the inside of the battery. Once the battery is at 32ºF, the switch turns off and the electric current flows in the normal manner.

While other materials could also serve as a resistance-heating element, nickel is low cost and works well.

"Next we would like to broaden the work to a new paradigm called SmartBattery," said Wang. "We think we can use similar structures or principles to actively regulate the battery's safety, performance and life."

Also working on this project were Guangsheng Zhang and Yongjun Leng, research associates in mechanical engineering; and Xiao-Guang Yang, postdoctoral Fellow, all at Penn State. Terrence Xu, Shanhai Ge, Yan Ji, innovation engineers, all at EC Power also collaborated on this research. Wang is also the Chief Technology Officer and founder of the startup EC Power.