Lithium-ion batteries don't like cold environments. Under 10 degrees Celsius, traditional lithium-ion batteries can't be quickly charged, which is a serious problem for electric cars in many areas. On Scandinavia Electric cars must be equipped with a small heater in the battery box, and the heating device in California is significantly larger than in Minnesota and Canada.
The team led by Chao-Yang Wang, head of the Electrochemical Engine Research Center at Penn State University, has developed a new type of battery that can avoid the loss of energy at freezing temperatures by self-heating. It relies on the principle and fast charging. The principle of the station is the same, but it allows the battery to charge in 15 minutes even when the ambient temperature drops to minus 43 degrees Celsius.
The battery connects one end of a piece of nickel foil to the negative pole, and the other end extends to the outside of the battery to form a third pole port. The temperature sensor connected to the switch controls the current through the switch through the switch when it detects that the ambient temperature drops to about 25 degrees Celsius. Piece. Resistance to resistance causes the nickel piece to heat up and provide temperature to the battery from the inside.
Once the temperature rises above room temperature, the battery-equipped switch automatically transfers the current to directly charge the battery. Wang claims that this means we don't need to replace the charging station, just control the heating and charging inside the battery, no Need to adjust the charging device.
In a report published in the Proceedings of the National Academy of Sciences, researchers claim that their prototype battery can withstand 4,500 cycles of 15 minutes of fast charging at 0 degrees Celsius, and the energy loss is only 20%. This means that the battery life will reach 12.5 years. In contrast, a traditional battery with 20% energy loss can only withstand 50 charges.
Researchers say this innovative technology also makes batteries safer. Charging lithium-ion batteries at 10 degrees Celsius causes lithium ions to collect on the anode surface, which can create risks such as short circuits, heat loss and ignition. Researchers say this unique The fast charging method allows manufacturers to create smaller, safer and safer batteries for electric vehicles.
