As we all know, the battery is the basic energy of electric vehicles, it determines whether the electric vehicle can have a long range, so far many people are on the sidelines, nothing more than because the mileage can not reach the purpose, we all know the avalanche period of battery life, and the safety of the whole vehicle full of batteries has concerns. BYD and Tesla in the use of batteries, respectively, take two roads, and asynchronous motors and permanent magnet synchronous motors are very similar, BYD uses independent research and development of "lithium iron phosphate blade battery", and Tesla purchased Panasonic appliances ternary lithium batteries.
Tesla's purchased ternary lithium battery has the advantage that the battery energy density is large, the voltage platform is high, the capacity is larger than the same volume/weight, and even the battery at the same time, and the battery life is longer. The disadvantage is poor safety performance, not resistant to high temperature, if the battery because of foreign body intrusion, squeezing, impact, causing internal short circuit, easy to produce violent deflagration, once the battery fire, can not be extinguished immediately, and has a greater threat to the owner.
BYD's independently developed lithium iron phosphate blade battery, its advantage is good safety performance, lithium iron phosphate crystal P-O bond is stable, so in the case of high temperature, extrusion, collision, needle punch, the battery ignition probability is low. Although the blade battery solves the safety problem, but the blade battery is not a new product, its essence is still lithium iron phosphate battery, but the single cell has been flattened, similar to the blade shape, its disadvantages low energy density, low temperature performance is still the biggest pain point, the consistency of the product is also questioned.
According to relevant evaluations, Tesla Model 3 long endurance version, compared with BYD Han EV long endurance premium type, the day's temperature is about minus 1 degree, at an average speed of 46km/h, the whole journey is 221 kilometers, the load of three people, the test results, model3 endurance reduced by 275 kilometers, and BYD Han EV range reduced by 224 kilometers, that is to say, Han EV endurance and battery attenuation speed is better than model3.
In terms of safety, BYD's lithium iron phosphate battery is also safer than Tesla's ternary lithium battery, which is why Tesla always bursts into flames, so that the formation of conditioned reflexes, as long as there is a car fire first suspect is not Tesla, in fact, the speed of the car is not the most important, driving is convenient life, safety is the top priority, in the battery performance BYD beat Tesla.
But it is undeniable that Tesla took the high-end route at the beginning, and the first batch of car owners were the domestic elite, they laid the brand status of Tesla, even if Tesla continues to reduce prices now, it is still a high-end car in the eyes of the Chinese. BYD took the mid-range route at the beginning, Tesla began to go to the high-end route, two different development routes, resulting in different brand awareness and recognition, so in terms of brand awareness, BYD is temporarily inferior to Tesla.
BYD is improving, but Tesla is still a strong and respectable opponent, and from the monthly sales of Tesla Model 3, BYD still has a long way to go. However, as more and more people have personally driven Tesla, its simple interior, rough workmanship, and the cancellation of the design of the dashboard began to be constantly complained about. In particular, the 15-inch central control screen, when driving, one-third of the screen shows the driving status, and the remaining two-thirds of the screen is somewhat cramped, resulting in very small driving navigation, and sometimes it is impossible to see the missed intersection. In these respects, several of BYD's new cars are better than Tesla's.
In fact, having said so much, if we want to make our own physical manufacturers grow and develop, it is useless to only talk about guns like some Internet companies. Especially for hard-working science and technology companies like BYD and Huawei, everyone should fully support them. But then again, the competition of science and technology depends on the competition of talents, and Yang Zhenning, who has won the Nobel Prize, said in an interview: "Our future, in the final analysis, lies in the competition of talents, and the cultivation of talents must start from the dolls." ”
But the problem now is that many children have lost interest in mathematical, physical and chemical subjects, and all that remains is a variety of test questions and formulas. How can the talents cultivated in this way have innovative thinking?
Therefore, when Yang Zhenning returned to China to see this situation, he suggested: "When we should cultivate the next generation of talents, we should enlighten their mathematical, physical and chemical disciplines, stimulate their scientific interest from an early age, and cultivate creative thinking." ”
To know that children in the stage of growth, 5 to 15 years old is the golden age of development, if at this time can be enlightened education in mathematics, physics and chemistry, stimulate their interests and hobbies, then you can cultivate their innovative thinking, stimulate the potential of scientists.
In this regard, the CCTV column "First Time" recently recommended a set of science books specially created for children aged 5 to 15 years old, "This is Physics".
The book has sold more than 10 million copies so far and has been listed as the "best reference book" outside the classroom. Adopting the form of "story + comic", the abstract physical knowledge and formulas are combined with vivid stories and humorous comics to combine our daily life scenes, so that children can grasp the physical knowledge unconsciously in a relaxed and pleasant reading.
"This is Physics" covers the 10 major physics topics that primary and secondary schools must learn: gravity, energy, sound, light, electricity, heat, matter, etc., covering 85% of the middle school physics test sites! Construct a framework for children's systematic physical knowledge, and memorize the middle school knowledge points in laughter. Many things that are taken for granted by adults are full of wonder in the eyes of children: Why is the sky blue? Why did I jump so hard that I finally had to get back on the ground?
And these problems are precisely the children's exploration of the new world, and in this sensitive period, they can best cultivate children's scientific thinking! Let the children become physics experts while solving their doubts, rather than just saying: You'll know when you're in middle school.
For example, in "Why can your eyes see things?" In one section, the author draws the light into a cute little ball, and tells the child in the form of a cartoon that light is an energy, the reflection of light, and the light travels along a straight line.
This set of books not only explains the physical knowledge points in detail, but also pays attention to the integration of disciplines. Physics is a difficult subject to learn, a student who has instilled physical thinking from an early age, when exposed to physics, is bound to be more interested, can keep up with the speed of the teacher's lectures, and students who have just come into contact with physics have resistance to this unknown subject, and the gap is getting wider and wider.
What children resist is not knowledge, but boring textbooks. This set of books breaks the children's fear of science, exercises the children's scientific thinking, lets them take the initiative to explore the mysteries of the world, so that learning is an interest! For smart parents, this set of books is much more meaningful than giving their children toys and game consoles.