Qin Hai noticed Zhang Daiwei's expression, but he just smiled and didn't explain anything for Ka'an. Selling guanzi is Qin Hai's favorite thing to do, and he believes that after watching the whole experiment, Zhang Daiwei will know how outrageous he was wrong.

In the blink of an eye, the experiment had been going on for 5 minutes, and it was time for Zhang Daiwei to think that the battery was about to run out. But the speed of the electric fan did not slow down at all, and it still roared strongly. Zhang Daiwei nodded, to be able to have such a power output capacity, coupled with the power that is not inferior to ordinary nickel-cadmium batteries, it is suitable for the use of electric vehicles, no wonder Qin Hai specially called him to visit.

Six minutes later, the fan was still spinning at high speed......

7 minutes ......

8 minutes ......

Zhang Daiwei's eyes straightened a little, no, the amount of electricity stored in this small box is so huge. In this way, the size of the battery box of an electric vehicle will be reduced by half, and the weight will be reduced in proportion, which means that the electric vehicle can have more space for riding, which is a key competitive advantage of electric vehicles.

One of the disadvantages of electric vehicles is that the battery takes up too much weight. If the number of batteries is reduced, the range of electric vehicles will be greatly reduced. In later generations, common battery cars generally had a range of more than 300 kilometers, and for this purpose, it was necessary to install batteries of more than 500 kilograms. Although the engine, transmission, etc. of an electric vehicle are lighter than that of a gasoline vehicle, it is completely unable to offset the weight of the battery. Engineers are striving to increase the specific energy of the battery, which is the amount of electricity stored per kilogram of weight, thereby reducing the total weight of the battery in the car. Judging from this experiment, the specific energy of the battery in front of me is also amazing.

10 minutes ......

11 minutes ......

12 minutes and 17 seconds!

The red indicator light on the battery compartment suddenly went out, and the inverter made a "click" sound, cutting off the power supply. The electric fan was powered off, and the fan blades continued to rotate with inertia, gradually slowing down, and finally stopped.

Zhang Daiwei didn't wait for the fan blades to stop, and then clapped his hands with a happy smile on his face. He said to Ka'an, "Mr. Ka'an, this battery is amazing, it's the best battery I've ever seen!" With such a battery, our new energy vehicles have real practicality. ”

"Don't worry, Mr. Zhang, the experiment is not over yet." Qin Hai interrupted Zhang Daiwei's words with a smile.

"Not over yet?" Zhang Daiwei was surprised, isn't this perfect enough?

An assistant disconnected the battery box from the inverter, then pulled another power cord and plugged one end into the battery box and the other end into a wall outlet. Zhang Daiwei can see it. The other party is charging the battery, and it is estimated that it is ready to be fully charged before doing the next set of experiments.

"While it's time to charge, please ask Mr. Caan to introduce me to this new type of battery." Zhang Daiwei looked at Ka'an and said. In his experience, the battery charging time is very long, even with the so-called "fast charging", at least more than half an hour, and this is still for this kind of small battery. If it's the 500 kg battery used in the car. It would be a miracle to fill it in six or seven hours.

This time it was Caan's turn to shrug his shoulders, and he shook his head and said, "Let's talk about it after watching the experiment." I'm worried that I won't be able to get things clear in two minutes. ”

"What, two minutes?" Zhang Daiwei was stunned.

Before he could react, Ka'an's assistant had already unplugged the battery's power cord again, and the total charging time was less than a minute. The two assistants reconnected the battery compartment to the inverter as they had done before, and flicked the switch. I saw the electric fan whirring again.

"This, this, this, this ......" Zhang Daiwei only felt that the blood in his whole body was gushing on his head, making him feel dizzy. He finally managed to control his excitement, pointed to the battery box and asked Qin Hai, "Is this what you said, super capacitors!" ”

"Exactly." Qin Hai had long expected Zhang Daiwei's performance, so to speak. No one knows the value of supercapacitors better than Zhang Daiwei, so no one will be more ecstatic than Zhang Daiwei when witnessing the appearance of supercapacitors.

One of the disadvantages of electric vehicles is that the weight of the battery is too large, and its biggest disadvantage, that is, the biggest of the so-called "no one", is that the battery of electric vehicles takes too long to charge, making it impossible to replenish energy at any time like fuel vehicles.

A fuel car can drive 500 to 700 kilometers with a full tank at a time, and then just find a gas station, fill up the tank in a few minutes, and continue on the road. An electric car can only drive 300 kilometers on a single full charge, and then it takes five or six hours to fully charge. In this way, electric cars can only be used for short distances, driving 300 kilometers a day and then spending one night charging. This limitation is fatal for electric vehicles, and it greatly limits the market for electric vehicles. For the average family, who would buy a car that can't run long distances?

There are two types of energy storage devices for electric vehicles, one is a rechargeable battery, and the other is a supercapacitor with a capacity that far exceeds that of ordinary capacitors. The advantage of capacitors is that they can be charged and discharged very quickly, and theoretically even reach the point of instantaneous filling and instantaneous release, at present, provided that the external circuit is not burned out as a result. The feature of fast charging solves the problem of charging speed, while the feature of fast discharge satisfies the requirements of power output.

Zhang Daiwei only understood at this time why Ka'an dared to confidently say that he could increase the power output by 10 times, and if the load capacity of the inverter and the heating of the wire were not considered, it would be easy to increase the output power of the supercapacitor by 100 times.

A few years ago, Qin Hai once told Zhang Daiwei about the idea of supercapacitors, but Zhang Daiwei only had a half-believing attitude towards it, and quickly put it behind him. The reason for this is that rechargeable batteries already have sufficient technical reserves, while supercapacitors are still in the stage of laboratory verification. Manufacturers of new energy vehicles around the world are committed to improving the existing rechargeable batteries, and even if some manufacturers propose the concept of supercapacitor vehicles, it is limited to a long-term expectation.

Who would have thought that Qin Hai would solve the problem of supercapacitors quietly, and the specific energy, power output capacity and charging speed of the capacitors have reached an almost perfect level, how can this not make Zhang Daiwei crazy.

"Mr. Caan is an expert at the Embraer Institute of Technology and has a proven track record in both superconductivity and supercapacitors. This time, our School of Materials specially hired Mr. Kaan as the chief expert of the supercapacitor laboratory, and in the battery box in front of him is the graphene supercapacitor newly developed by Mr. Kaan. Qin Hai introduced to Zhang Daiwei.

The conceptual design of supercapacitors has been around for a long time, but the research progress has been very slow, and one of the key factors is the limitation of electrode materials. The principle of capacitance, simply put, is to separate two electrodes with a certain medium, and the positive and negative charges are stored on the two electrodes, so as to achieve the effect of power storage. In order to expand the capacity of the capacitor, it is necessary to increase the power storage capacity per unit area of the electrode, and secondly, to put a larger electrode in a limited space, for which it is necessary to find a better electrode material.

The discovery of graphene has opened the door to the study of supercapacitors. Graphene is a single-layer atomic structure and is the thinnest material in the world, so the largest area of graphene electrodes can be accommodated in a capacitor with a defined volume. At the same time, the planar layer sheet structure of graphene is conducive to the infiltration of electrolyte and the adsorption and desorption of ions, so as to improve the energy storage density of capacitors. In São Paulo, as soon as Caan heard Qin Hai's introduction to graphene, he knew that this was the most ideal capacitive electrode material, so he did not hesitate to come to Qin Hai.

Qin Hai doesn't need to explain these situations to Zhang Daiwei in detail, there is a specialization in the art industry, and Zhang Daiwei may not be able to understand professional knowledge like graphene. However, the supercapacitor is in front of Zhang Daiwei, and Zhang Daiwei is clear about what significant impact this technology will have on the development of new energy vehicles.

"Can this capacitor be mass-produced now?" Zhang Daiwei took the battery box with the supercapacitor and looked at it lovingly, and asked Qin Hai and Ka'an at the same time.

Caanillo said with some regret: "I don't think the current capacitor has reached the ideal level that I want, so I am not in favor of mass production." However, Mr. Qin believes that it is now time for mass production. ”

Qin Hai smiled: "Mr. Ka'an, I haven't stopped you from optimizing the supercapacitor in the slightest, and we are all looking forward to you coming up with a better supercapacitor." However, Mr. Zhang can't wait now, if we don't carry out the mass production of supercapacitors now, we will not be able to see the prototype of new energy vehicles in July next year. ”

"The two things don't conflict." Zhang Daiwei hurriedly said, "We can launch the first generation of supercapacitors, and after Mr. Ka'an comes up with better technology, we will launch the second and third generations." The foreign experience is that new and improved models must be launched every three months, and the update of capacitors can be used as a major change, and it is not too much to change the generation every year. ”

"We are conducting a comprehensive test of the supercapacitor, and Mr. Zhang will also cooperate with us to conduct some tests. The construction of our supercapacitor production line of Daqin Group started half a year ago, and mass production can be achieved in two months at the latest. The first production capacity is 4 million pieces per month. Qin Hai introduced to Zhang Daiwei.

"A car needs 4,000 capacitors, and 4 million can meet the needs of 1,000 cars, so our annual output is 12,000 cars...... For now, that's enough. Zhang Daiwei said.

"12,000 vehicles per year? Too little. Qin Hai said dissatisfied, "Don't worry, I will start the construction of the second production line immediately, and within half a year, the production capacity will be expanded by more than 10 times." (To be continued......)