With the release of SAIC Zhiji L6 model, the eyes of the automotive industry have instantly gathered. It can be said that the attention of this car is not even lower than that of Xiaomi. And the reason for this is related to the battery. Because it is the second model equipped with a semi-solid-state battery that achieves a range of 1,000 kilometers.
Not long ago, NIO's ET7 equipped with a 150-degree battery actually ran a record of 1044 kilometers under the personal driving of the NIO boss. The biggest feature of these two cars is that they are equipped with semi-solid-state batteries, which are safer, larger in capacity, and more stable in performance than conventional liquid batteries.
Therefore, the transition from liquid to semi-solid, or even solid, will be the core vocabulary throughout 2024. WHETHER IT IS THE ENERGY DENSITY OF NIO'S ET7 BATTERY REACHING 360WH/KG, OR THE SAIC ZHIJI L6 BATTERY REACHING 368WH/KG, THEY BOTH REPRESENT THE SECOND ECHELON LEVEL OF CHINA'S CURRENT SEMI-SOLID-STATE BATTERIES.
The power battery of electric vehicles has developed greatly
Solidification brings ultra-long battery life
According to the different electrolytes, lithium batteries are divided into: liquid electrolyte, semi-solid electrolyte, and all-solid electrolyte. Liquid electrolytes are liquid electrolytes that flow like water, semi-solid electrolytes are called "gelatinous electrolytes" and look like jelly, and all-solid electrolytes are "powder electrolytes" that do not contain any liquid, just like flour.
From liquid to semi-solid, battery performance has evolved rapidly, and charging speed, life, and so on have been greatly improved. In the all-solid-state era, because it does not contain any liquid components, there is no possibility of freezing at low temperatures (any liquid has a "freezing temperature"), or evaporating and boiling at high temperatures.
Therefore, all-solid-state batteries are the direction of future development, but the most practical engineering solution from the current is semi-solid-state. Vehicles equipped with semi-solid-state batteries have begun to hit the 1,000-kilometer range due to their high energy density. So, if you press it directly overnight, the existence of the oil truck is slightly embarrassing. Do you think, when the tram has no range anxiety, how many people will choose the oil car?
Behind the range of more than 1000 kilometers
It is necessary to reduce wind resistance and improve transmission efficiency
However, behind the increasing range of electric vehicles, it is not only the advancement of battery technology. In fact, to achieve a range of 1,000 kilometers, it is the result of the joint efforts of many disciplines. For example, in terms of aerodynamics, with the continuous evolution of wind tunnel testing and computer simulation analysis technology, the drag coefficient of today's cars is getting lower and lower, and there are even more than one model below 0.2Cd on sale. 10 years ago, this was an existence that I would not even dare to imagine.
At the second level, the drive efficiency of the electric drive system composed of motor + electronic control itself is also constantly improving. From less than 90% in the early years, to about 92% about seven or eight years ago, and then to more than 95% today...... Increasing efficiency means less energy is wasted, all energy is used to propel the vehicle forward, and the range naturally increases.
On the other hand, finding ways to reduce the mechanical resistance of vehicle operation has also become the direction that various car companies are chasing. Replacing the two-stage small speed ratio with a single-stage high-speed ratio transmission to reduce the number of transmission stages and reduce the total mechanical resistance of the system is a popular technical scheme at present.
Reducing driving resistance is also a core concept
Tire drag reduction has become a hot spot in the industry
Another example is the use of low-rolling resistance tires to reduce driving energy consumption. At present, some domestic tire companies have emphasized the consideration of reducing rolling resistance when developing new products, and have launched some corresponding products. For example, Thor Jingyue, which is available on the Tuhu platform, and its upgraded Thor Jingyue Pro, or Everest-Fulcrum, etc.
Take Leishen Jingyue Pro as an example, in order to achieve lower rolling resistance, the rubber tread formula has been adjusted, and a new silica and silicone system have been used to build a tread structure with lower "internal friction". Lower "internal friction" means that when the tire rolls, the lower its own energy consumption, and of course, the less heat it heats. This is not only good for power consumption, but also for its own durability.
Of course, in terms of pattern design, it is also helpful to reduce rolling resistance. The transverse grooves of Raytheon Jingyue Pro are basically presented in the form of "steel sheet grooves", the advantage is that it has lower rolling resistance (the wider transverse grooves usually have an impact on the rolling resistance), and it also has the advantages of not easy to catch stones, and more silent.
Of course, the biggest factor restricting the range of electric vehicles is still the battery. There is reason to believe that when all-solid-state, or even "non-lithium battery" technology is popularized, the range of electric vehicles will not be a problem at all. And this event is very likely to come early. So when the time comes, will the oil truck gradually decline, or will it come back in another way?