1. Lithium iron phosphate battery: mature but not enough
When it comes to buying new energy vehicles, most consumers may think of "policy concessions" for the first time. Although this is a bit embarrassing, it is indeed quite a real reason. In the domestic sales environment, new energy vehicles have to open up the situation, not only because of the long-term mission of “environmental protectionâ€. The advantages of new energy vehicles in terms of selling price and maintenance cost have indeed attracted most of the consumers who still use car-based costs at this stage.
However, some consumers may temporarily stop their curiosity about new energy vehicles for some reasons, because it will be overwhelmed by the various spontaneous combustion events of new energy vehicles. And that's why J2 wants to write this article today. You must know that you don’t understand the fundamentals of new energy vehicles – the advantages and disadvantages of energy modules, and if you don’t understand the things you need to pay attention to during use, it’s no different from buying a time bomb.
Lithium iron phosphate electrode material is currently the safest lithium ion battery cathode material, and its cycle life is more than 2000 times. Standard charging (5 hour rate) can be used to achieve 2000 cycles, coupled with the maturity of the industry. The resulting price threshold and technology decline have led many manufacturers to use lithium iron phosphate batteries for various reasons. It can be said that the week of new energy vehicles has an inseparable relationship with lithium iron phosphate batteries.
However, lithium iron phosphate batteries have a fatal disadvantage, that is, poor low temperature performance, even if they are nano-sized and carbon coated, this problem is not solved. Studies have shown that a battery with a capacity of 3500 mAh, if operated in a -10 ° C environment, after less than 100 charge and discharge cycles, the power will be abruptly attenuated to 500 mAh, basically scrapped. This is indeed not a good thing for China's comprehensive National Day, which has a vast territory and a low temperature in winter.
In addition, the preparation cost of the material and the manufacturing cost of the battery are high, the battery yield is low, and the consistency is poor, which is also an important reason that the endurance of many pure electric vehicles cannot reach the nominal value. Therefore, we can see that there are quite a few new energy vehicles in China (whether pure electric or hybrid electric), or some relatively cheap new energy vehicles, which will choose lithium iron phosphate batteries for different reasons. It can be said that the use of lithium iron phosphate batteries has an indelible foundation for the mass production and promotion of new energy vehicles.
Bi Directions Thyristor (Triac)
Bi Directions Thyristor (Triac) is equivalent to the antiparallel connection of two unidirectional thyristors, but only one control pole.
Bidirectional thyristors are made of N-P-N-P-N five-layer semiconductor materials, and three electrodes are also derived from the outside. Its structure is shown in the figure. Bi-directional thyristor volt-ampere characteristic curve Since the forward and reverse characteristics of the bidirectional thyristor are symmetrical, it can be turned on in any direction and is an ideal AC switching device.
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