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Author: Charcoal grilled bamboo shoots
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"The test lasted for more than half an hour and consumed 8 kilowatt hours of electricity.
Looking at the power consumption curve, low speed is the most energy-saving, and subsonic speed is the most stable.
After breaking through the speed of sound, power consumption begins to increase rapidly.
In this way, 30% is low speed, 30% is subsonic speed, and the remaining 40% is supersonic speed.
To achieve a comprehensive endurance of 1,000 kilometers, the total battery capacity of the drone requires 20 to 22 kWh.
Considering that I personally prefer to fly airplanes, going supersonic, and taking off at Mach 4 and Mach 5, I need more than 30 kilowatt hours of electricity to be on the safe side.”
Before manufacturing ultra-high-energy batteries, Chen Yi printed out the power consumption curve for drone testing.
After some calculations, the battery parameter values ​​required for a drone were obtained.
Ion propulsion.
Essentially, it is a propulsion method that consumes electrical energy to generate an electric field and accelerate ions.
In this way, the energy source of the ion propulsion drone is naturally also a rechargeable battery.
The layout is bigger.
This is a new energy drone that replaces oil with electricity in response to national policy.
"The latest ternary lithium battery has an energy density of 300Wh/KG."
"But to reach a capacity of 30 kilowatt hours, a 100-kilogram battery is needed, and the weight is seriously excessive."
Current drones also need to be sprayed with a thermal barrier protective coating to prevent the high temperatures of the thermal barrier from damaging the carbon fiber structure.
Although carbon fiber is high temperature resistant, it can withstand temperatures of 1,700 degrees Celsius without any problem.
But the resin together with the carbon fiber can only withstand temperatures of a few hundred degrees Celsius.
Certain coating protection must be carried out to avoid damage by the supersonic thermal barrier.
Chen Yi calculated the weight of this part and it was about 2 kilograms.
In addition, consider the lift-off limit.
The drone also needs to bring some ion propellant, which requires a budget of about 10 kilograms.
The fuselage takes up another 13.9 kilograms of weight.
According to the design with a total weight of 40 kilograms, the budget left for the battery is only 14 kilograms.
In this way, the energy density of the battery must reach 2150Wh/KG.
"Let's get started. It will add some technical reserves to Yi Fei. Technology will change the world."
Chen Yi shouted, kicked down the Yadi ternary lithium electric car next to him, and disassembled all the casing and frame accessories.
The laser scan produced the original structural image. Chen Yi put on the virtual helmet, opened the CAD software, and began to optimize these structures hundreds of millions of points.
If one method is unified, all methods will be unified, and all things will be harmonious.
Reading information and virtual learning, Chen Yi is now proficient in supersonic aircraft, structural design, and aerodynamic layout design of spacecraft.
Now, on the other hand, designing and optimizing the structure of an electric vehicle is not too simple.
In less than half an hour, the structural stability of the electric vehicle was optimized, the structural center of gravity was also optimized, and the final aerodynamic layout of the body was also optimized.
The two carbon fiber 3D printers next to them began to spray out hot powder, like stacking houses, printing out the frames and body shells of electric vehicles one by one.
Eleven o'clock at night.
The components of the electric vehicle are printed.
Chen Yi took it to the spray booth and spray-painted these components one by one.
After the paint is dry, assemble it.
An electric car made of carbon fiber, with a low and slender shape that looks like a sci-fi product has just been released.
[Item: An exquisite and beautiful carbon fiber electric car]
[Attributes: Energy x6.2, speed x3.8, electronic control x5.2, stability x27.3, strength x19.2, beauty x22.8]
[Note: This is an exquisite, expensive electric vehicle made of carbon fiber. Although it has an aerospace-grade aerodynamic layout, an aerospace-grade stable design, and an aerospace-grade center of gravity design, rest assured, it still only has a top speed of 25km/h.
.]
"Gan!"
"Forgot about the new national speed limit!"
"Fighting energy turns into a horse. As long as your horse can run at a speed of 30 kilometers per hour, no electric car, no matter how powerful it is, can catch up with you."
Chen Yi was speechless when he saw the remarks and comments about the electric car.
"I didn't think about the new national speed limit in advance. It's so late and it's not convenient to find someone to lift the speed limit."
"The total attributes now exceed 80. According to the rule that the maximum attribute cannot exceed the sum of the other attributes, the energy attribute can be adjusted and upgraded to more than 40, which should be enough."
Chen Yiyuan thought about finding someone to decode the code and cancel the speed limit for electric vehicles.
But look at the time.
It was almost twelve o'clock in the morning and I put down my phone again.
Calculating the initial total attributes of the electric vehicle, we found that the energy attribute can be adjusted to 40.
Chen Yi decided not to find anyone to relieve the control, but to do it now.
Colorful lights bloom.
Wait for the light to dissipate.
Electric vehicles, which were originally like science fiction, have begun to return to modern style.
【Aesthetics:22.8→12.8】
【Energy:6.2→16.2】
[It is detected that a certain attribute exceeds the initial value. Do you want to read the information? Yes/No!]
"Read!"
Chen Yi did not hesitate and chose to read.
A lot of information emerged in his mind, and Chen Yi quickly understood the technical information.
"All-solid-state lithium battery, the technology is average, the energy density is 860Wh/KG, continue!"
Chen Yi continued, lowering attributes such as stability and strength, and adjusting and upgrading to energy attributes.
A few minutes passed, the light dissipated, and Chen Yi continued to read the information.
"Energy attribute 26.2, the negative electrode is changed from graphite material to semi-silicon carbon material, and the energy density reaches 1890Wh/KG."
"It seems that this negative electrode silicon carbon material should be the main direction of the next generation of lithium batteries."
Continue to adjust and read information.
Energy properties 36.2, the negative electrode material becomes a full silicon carbon material.
The energy density has reached 3689Wh/KG, which is a huge improvement.
Energy Properties 41.2, the ratio of silicon-carbon anode materials has been optimized.
The structure of the battery has been optimized, with an energy density of 5216Wh/KG.
"5216Wh/KG, I feel it is not the limit of carbon silicon anode material. With continued optimization, we should be able to reach an energy density of 6000Wh/KG."
"But if we really get here, it should be almost the energy limit of lithium chemical batteries."
Chen Yi read all the information and made some analysis in his mind.
This all-solid-state carbon-silicon lithium battery with an energy density of 5216Wh/KG still has some room for optimization.
However, no matter how optimized it is, Chen Yi guesses that it will almost reach the density limit of lithium batteries.
Although it is rumored that there are also 12,000 Wh/KG lithium-air batteries.
But Chen Yi, who has some knowledge of this aspect, understands that 12,000 Wh/KG is a literary and artistic lie calculated solely from moles without all other battery components.
Real lithium air is difficult to break through even 1000Wh/KG, and the technology is very difficult and requires the use of precious metals such as gold.
Based on the full battery technology read, Chen Yi made some adjustments to the technology with 26.2 attributes and an energy density of 1890Wh/KG.
Reduce part of the energy density to further improve safety.
Finally, a 1400Wh/KG semi-silicon carbon lithium battery solution that is much safer than lithium iron phosphate has been released.
Send this carbon-silicon battery technology and preparation process to He Yu.
Before Chen Yi opened his studio, he manufactured ducted aircraft models and equipped them with battery production equipment.
The sky is dark and bright.
Chen Yi used up all seven fire extinguishers in the studio.
He finally successfully manufactured a set of batteries wrapped in carbon fiber, weighing 14 kilograms, with a single modular design and connected in series.
[Item: Ultra-high energy carbon silicon lithium battery]
[Attributes: Energy x40.8, Safety x10 (-8.8), Strength x19.2]
Three core attributes of simplicity.
Among them, the theoretical safety attribute is 10, and the actual safety attribute is minus 8.8, which represents Chen Yi's rigorous manufacturing process.
"This battery is too difficult. It is completely different from the previous batteries."
Chen Yi spoke harshly, subtracting 5 points each from energy and intensity, and raising safety to 11.2.
The safety exceeds the theoretical value of the design to ensure that there will be no drone accidents in which the battery catches fire when it is half empty.
“The overall energy density is 3480Wh/KG, and it reaches 48 degrees Celsius when fully charged.
In addition, the battery is a single modular design. If the series connection method is improved, the control program can be adjusted and the auxiliary fuel tank discarding can be added. Oh no, it is a dead battery discarding program.
When the battery runs out of power, the drone will discard that battery, further reducing the weight of the fuselage.
With such a multi-pronged approach, even if you like to fly planes, if the range is half of that of modern fighter jets, 1,500 kilometers will be no problem at all.”
Chen Yi installed the battery on the drone.
Improve the series connection method and control program, and then spray a layer of thermal barrier protective coating on the drone.
The time is nine o'clock, the rising sun is just right, suitable for drone test flights!
Chapter completed!