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- Jul 16, 2018 -

Under the conditions of temperature below 0 degree Celsius, lithium battery that self-heats can have multiple applications especially for electric vehicles energy consumption during winter.


Researchers have noted lithium-ion batteries have the problem to not perform well at subzero temperatures and it may not affect phones or laptop but it does affect a lot the usage of electric vehicles, drones, outdoor robots, etc… 

At low temperatures, conventional batteries freeze and lose a lot of energy. They are also slow to charge in cold weather, have 40% loss in cruising energy for vehicle cruise. And these types of issues make manufacturers build bigger and expensive batteries packs which can help compensate for the loss of energy observed during the cold.

As researchers are worried about losing at least 40 to 50% of battery energy during the winter, they are slowing relying on previous researches to develop an all-climate battery to weigh very little over conventional batteries and not cost about a little over normal batteries. The design will allow the batteries to only lose about 3.8 to 5.5% of their capacity They also designed it to go from -4 to 32 degrees Fahrenheit within 20 seconds and from -22 to 32 degrees Fahrenheit in 30 seconds and consume only 3.8 percent and 5.5 percent of the cell's capacity. This is far less than the 40 percent loss in conventional lithium ion batteries.

Scientists are using a nickel foil of 50 micrometer thickness with one end attached to the negative terminal and the other extending outside the cell to create another terminal. To make the electrons flow through the nickel foil to complete the circuit, a temperature sensor is attached to a switch. This rapidly heats up the nickel foil through resistance heating and warms the inside of the battery. As soon as the temperature of the battery comes back to 0 degree Celsius, the switch turns off and the electric flows in a normal way.

Nickel was the material chosen by scientists over other materials because of it works well and doesn’t cost much. Researchers think they can use the structures to design safer batteries which will have better life cycles and perform better during winter.