I ask you to build tractors, but you build rockets?

Chapter 61 CZ-6R first explosion

In the open space of the Xinyuan factory, an engineering test prototype is being towed onto a trailer and prepared to be transported to the mountain city.

The first set of smart car battery management systems has been officially produced. Four sets have been produced and one prototype has been modified, which will be sent to the Southern Automobile Base in Shancheng for more detailed testing and running-in.

“The battery we chose for the first generation BMS is 18650 battery, which comes from a domestic manufacturer. A set of battery panels uses 12 battery packs, and each battery pack has 600 18650 lithium batteries.

I chose the 18650 battery not because it is excellent, although this is indeed a plus. The performance of ternary lithium batteries, lithium iron phosphate batteries, and 18650 lithium batteries on the market are not much different. However, the 18650 battery has been promoted for many years and the technical standards are very mature. The parameters of a large number of cells are almost identical, and the many manufacturers have great bargaining power. , combined, the risks and costs are relatively easy to control. "

Listening to the engineer introducing the parameters of the first-generation BMS, Lin Ju raised his own questions:

"But after all, there are more than 7,000 batteries. There should be a big gap in performance between them, right?"

"Boss, you need to know how the industry evaluates 18650 batteries: If two 18650 batteries are tested and found to have different parameters, it must be that the testing machine is broken. It is very mature. On the contrary, although ternary lithium batteries and lithium iron phosphate batteries are There is a slight advantage, but quality control is actually not stable.”

Lin Ju didn't say anything more. He chose to trust the judgment of professionals.

X-BMS1.0 is called "the world's first mature and efficient battery management system" by system engineers. It can intelligently maintain battery life through self-designed circuit control.

The system can independently allocate capacity flexibly according to 7200 small batteries, trying to save the limited number of charging times of lithium batteries, so as to extend the life and maintain performance as much as possible.

At the same time, the usage intensity of the battery pack can be arranged by area, the cell temperature can be controlled, and the built-in liquid cooling structure can be used for heat dissipation.

Although the chips used are from mature design solutions in the market, the design and software are definitely far ahead of the curve, and ternary multi-channel parallel processing is applied to reduce the amount of calculation and lower the cost.

The most expensive part is a high-performance graphics processor from Nvidia, but system engineers believe it can be replaced with a ternary chip in the future.

Relying on the ternary chip and the corresponding software system, it is expected that the minimum process of the ternary chip is only 40nm, and it can now be mass-produced in China. Even if it is an international OEM, there are no restrictions. It does not matter if the power consumption is higher. It will not be used in cars. Not even close.

As for the motor used, it is a permanent magnet synchronous motor from Southern Motors, and two to four units will be installed on one vehicle in the future.

Xin'an plans to have three main models in the future: taxis that reduce costs and reduce battery specifications, online ride-hailing vehicles and construction site muck trucks, as well as luxury models priced from 300,000 to 500,000.

To put it bluntly, the former is to make chassis, find ways to reduce operating costs to gain advantages, and the production speed is very fast; the latter is detailed work, which needs to be coordinated with the slow development of intelligent driving systems. It must wait for the completion of the B-level base and cooperate with ternary chips. Gained the advantage.

Why did the intelligent driving system develop rapidly after Juhua Factory entered the tram industry in later generations? It is because of its own software and hardware foundation. Without these, intelligent driving cannot be achieved.

So this is still a long-term project...

…

On April 22, Bingzhou Satellite Launch Center.

A Long March 6 reusable rocket, painted white with CZ-6R, stood on the launch station, with white smoke surrounding it and floating into the clear blue sky.

In addition to the first stage, the second, third stage and fairing are all counterweights. Of course, the main test purpose of CZ-6R is only the core stage, and the upper stages are easy to handle.

The Taiwanese version of K120V and YF100K has been installed on the bottom of CZ-R. It is surrounded by retractable support legs that are exactly the same as the Xinyuan No. 1 variant.

The superior leader's angry words of "just copy Xinyuan No. 1 and C" became a reality in the Eighth Institute. Except for the slight difference at the upper level, the core first class and the modification of Xinyuan No. 1 cannot be said to be exactly the same, and they can be regarded as deja vu.

"Director Tang, your YF100K has been greatly improved. It has directly changed from the oxygen-rich staged combustion cycle to full flow? The technology of K120 was not paid for in vain!"

"From each other, the Long March 6R and Xinyuan 1C designed by Mr. He seem to have changed their paints. I hope they can be recycled once again."

Tang Weitian and He Zhuang each took troops from the Sixth and Eighth Institutes and hid in the launch control room.

Although they were trying not to give in to each other, in fact everyone was very nervous.

It’s so damn fast, I feel uneasy!

The YF100K was developed in less than five months, and the CZ-6R was launched in a hurry and produced at a rapid pace, a full five months ahead of the Long March 6's original first flight in September this year.

Huaguo Aerospace has always paid attention to stability, and this completely went against the decision of the founder.

But the arrow has to be fired when the arrow is on the string. Last year, we issued a military order with the leaders. The reusable configuration of the Long March 6 is exactly the same as that of the Xinyuan 1. The engines are all from the same source. If we can't handle this this year, then stop doing aerospace and go to work. Let's build tractors in Baotou.

"...5, 4, 3, 2, 1 fire."

"ignition"

The YF100K sprayed out flames exactly like its brother K120V, and staged exactly the same scene in November last year in front of the Bingzhou Satellite Launch Center, smoothly taking off with the CZ-6R.

The Zhen Lao Aerospace in the team breathed a sigh of relief. For them, if the hastily built rocket did not explode on the spot, it was a victory.

"First-level shutdown, second-level separation"

At this time, the CZ-6R officially enters the recovery process, and the grille rudder on the top of the core stage swings to adjust the rocket's attitude.

At this time, the ground is still very confident, because the controllable grid rudder is not a new technology, and it has been often used in the past to control the landing area of ​​rocket debris. Everyone is still confident in this.

The height of the rocket dropped little by little, and finally the naked eye could see it hovering over the Bingzhou Satellite Launch Center.

"Old He, please don't blow up my launch site with your rocket. If it lands in our building, we will all die gloriously."

"It can't be deflected!"

The rocket descended to the predetermined height, and the ground issued a driving command to the YF100K.

There was no surprise. After the fuel was pumped into the combustion chamber, the engine output thrust at 25% power. Tang Weitian breathed a sigh of relief.

The entire mission of the Sixth Institute ends here. As long as the engine doesn't blow up, the Sixth Institute will not be blamed for anything that happens next.

The core first-stage rocket continued to decelerate and adjust its position at the same time. It coincided with the center of the infrared camera bit by bit. The tail nozzle kept swinging and fell to a height of less than 100 meters above the ground at a speed of several meters per second.

Everything seems to be no different from the modified core level of Xinyuan No. 1, even the recycled appearance is the same... that's fine.

The control room suddenly remembered the announcer's calm voice:

"01B height sensor signal offline"

01B height sensor? Wait that's...

The flames at the tail of the CZ-6R decreased sharply when it was twenty meters above the ground and switched to high-altitude mode. The rocket, which suddenly lost most of its thrust, immediately lost its attitude and fell diagonally toward the grass outside the launch site.

The control room saw an explosion cloud wrapped in thick smoke rising from the ground.

The well-prepared fire brigade swarmed in and rushed to the crash area.

The Long March 6 reusable Yaoyi mission lost control during the recovery phase due to an abnormality in the altitude sensor. The engine output thrust dropped sharply and crashed on the lawn 600 meters away from the recovery site.