It is said that it will soon enter the coldest winter since the 21st century. Dear car owners, since the winter, it is generally felt that the battery is seriously not used and the cruising range is getting shorter and shorter. It is also often heard that many owners complain about the short distance of the horse and the battery capacity does not reach the nominal capacity.
Before, Xiao Bian analyzed it from the aspect of warm air heat source. Why did the warm air wind in winter greatly affect the cruising range, and announced the current situation of everyone using the car in winter. Today, Xiao Bian talks about the power battery from the perspective of battery capacity professional.
For electric vehicles, batteries are a very critical component. Note that the battery mentioned below refers to the power battery as the driving source, not the battery in the front compartment. Because the battery in the front compartment does not have this problem, it is basically in the process of being charged while driving, and the cruising range is not related to this little guy. The capacity of the battery is directly related to the cruising range. The capacity is high, the cruising range is long, the capacity is low, and the cruising range is short. Then, what is the capacity, according to the definition of the national standard GB/T31486-2015 "Electricity Requirements and Test Methods for Power Battery for Electric Vehicles", there is a concept of [initial capacity]:
The capacity (Ah) released by the new factory's power battery when it is fully charged at room temperature and discharged at 1I1 (A) current to the specified discharge termination condition.
The required test environment is defined as: temperature of 25 ° C ± 2 ° C, relative humidity of 15% ~ 90%, atmospheric pressure of 86kPa ~ 106kPa. According to Du Niang, Lhasa’s winter pressure is 65 kPa. Does the national standard not consider the feelings of the Lhasa people using electric vehicles in winter?
Measuring instrument and meter accuracy requirements:
---Voltage measuring device: no less than 0.5
--- Current measuring device: no less than 0.5
---Temperature measuring device: ±0.5 °C
---Time measuring device: ±0.1%
What kind of ghost is 1I1(A)? For a chestnut, if your battery capacity is 50Ah, 1I1(A) is 50A, 2I1(A) is 100A, and so on.
The above [initial capacity] is basically the nominal capacity in the manufacturer's announcement. This value is multiplied by the total voltage of the battery pack, which is the nominal power.
When it comes to electric vehicles, there are two companies that have always been the focus. Tesla of the United States and BYD of our country use different batteries. Tesla uses the batteries of Panasonic Corporation. According to the information on the Internet, it is called The ternary material means that the positive electrode of the battery contains three kinds of metal materials; BYD uses its own battery, which is called iron battery inside. At that time, an explanation version of various iron batteries was heard. Now, the material is lithium iron phosphate. . What is the difference between these two materials? Xiaobian has found some information for everyone to let everyone know.
Of course, the choice of battery material system has little to do with consumers. Manufacturers often make their correct choices based on market trends and their own conditions. The figure below shows the voltage-capacity curves of the two materials.
![[Dry goods] Winter is coming. Power battery from the perspective of battery capacity](http://i.bosscdn.com/blog/15/14/03/2491-0.jpg)
This is the voltage change of lithium iron phosphate and ternary battery during the discharge process. The voltage of lithium iron phosphate is basically unchanged for most of the time, and the voltage of the ternary material changes greatly. The voltage range used is also different, lithium iron phosphate is about 3.3V~2.0V, and ternary material is 4.2V~2.5V.
Why do you want to give this picture here, because many things mentioned later are changing around this picture, according to battery engineers, most of their time research is based on this picture, how can we make the picture The data is changed, and what has been explained about the performance of the power battery after the change. For consumers, the change in this picture is the change in capacity.
The safety of the car is the primary problem. We often see the danger of the accident of the fuel car. How can the safety of the electric car be guaranteed? Electrical engineers say that we have a lot of monitoring, many protection circuits, and many levels of security. Battery engineers say that electrical engineers don't understand batteries, and our batteries have a lot of protection, which is integrated into the power management system, which is the BMS that everyone often hears. The so-called power management system is a system that manages the various indicators of the battery. How does the battery work and listen to it?
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