Electric car lithium-ion battery in winter is difficult to end?

　　Author ：Iflowpower – Portable Power Station Supplier

After the snow, the Beijing wet road has brought a lot of inconvenience, but for the pure electric owner, the inconvenience caused by the daily use car in winter is not only a slippery road, and even the vehicle's battery life has the temperature. The reduction is greatly reduced. For example, a famous electric vehicle product, when you actually use, go home before get off work, there are more than 80 kilometers of endless miles.

On the next morning, only 30 kilometers left, the endless mileage is reduced more than 40 kilometers. Why is this? Decreased during low temperature, and the structure of the battery is the most fundamental reason for the production of this phenomenon. , Eventually leading to a drop in discharge power of the battery.

If you simply put the lithium ion than the moving company's truck, the charge loaded is the goods. At normal temperatures, like trucks driving on a smooth highway, that is, fast and efficient. After the temperature drop, it is equivalent to the truck in the city center during the early peak, and the distance that can be finished in 20 minutes will not be 1 hour.

But because the number of trucks of the moving company is limited (the number of lithium ions in the lithium ion battery is limited), the goods transported in unit time are less. Or the metaphor of this moving company, after the early peak, the road recovery is smooth, the efficiency of the truck transported goods is normal, then if the temperature increases the battery life, will it increase? The answer is yes, but because most of the cases are driving outdoors, it is not easy to detect in everyday use, but it is obvious in the mobile phone. Low temperature charging, is not theoretically solved for the battery posted a warm treasure: in a 20 degrees Celsius, it is forbidden to charge the lithium battery (permanent damage to the battery).

And even an environment of 0 degrees, the discharge performance of the battery has dropped. In order to solve the problem of battery in low temperature environment, each manufacturer will take different power batteries to low temperature protection measures. For example, some is to install the heater around the battery, some, by heating the battery's coolant to achieve the purpose of warming the battery.

We specially consulted BYD and Tesla's technical experts, so that in the case where the temperature is low, in order to extend the battery life, BYD will reduce the upper limit of the charging voltage, and the amount of electricity to the battery will also reduce some. The recommendation given by Tesra is that the car is inserted in the car when the vehicle is parked, which can make the battery heating on the car to work better, even if the outdoor temperature reaches zero 20 degrees, the vehicle can also use it normally. Things seem simpler, before charging the battery before charging the battery, isn't it good? In fact, the car company is also done, the role of the "pre-charge" stage is basically giving the battery "warm-up".

Although the principle is simple, it is not so easy to realize it. Because most of the automotive manufacturers are not like BYD, Wanxiang, Dufluoro, etc. (Dufluo) announced the holding of Hebei Red Star Motors in August this year, announced their own charging plan, we call it a car enterprise) It is the home of the battery, so they all provide battery systems by suppliers.

The supplier will clearly safely charge the air-fired temperature range in the agreement with the car enterprise, if the car is trying to change (such as extending from 0 degrees to negative 10 degrees) requires additional costs. Solving battery problems in low temperature environments, but also relying on technical breakthrough because of the current lithium-ion battery material characteristics, low temperature performance is difficult to do very well. The low temperature performance and charging speed make people satisfactory titanate battery, but because of the small energy density, it is not suitable for use in small passenger cars (already applied to pure electric bus).

[Secret] The reason for the winter life of electric vehicles: all the lithium batteries are in the fuel car than the fuel car, the electric vehicle is widely promoted, and the corresponding technological accumulation is not as fully as fuel cart. However, with the development of new technologies such as graphene batteries, air lithium-ion batteries, soon, new technologies can solve the problem of short-term, low temperature charging limit, etc.