18650 battery 3.7v 6000mah

Range anxiety: two major problems: 18650 battery 3.7v 6000mah energy density and charging

The electric car craze is getting more and more intense, but range has become a bottleneck. The survey found that the biggest concern of current car owners is the range of electric vehicles. The most direct way to resolve range anxiety is to increase the range of electric vehicles. The core is to increase the energy density of 18650 battery 3.7v 6000mah packs and single cells, and the other is to make fast-charging batteries and layout charging facilities.

According to an industry expert, the first way to overcome "range anxiety" is to increase the energy density of power batteries, which is also the direction encouraged by the government and pursued by the industry. National policies and power 18650 battery 3.7v 6000mah companies are working hard for this. At present, the energy density of mainstream power 18650 battery 3.7v 6000mah companies has exceeded 180wh/kg, the energy density of 811 can reach 280wh/kg, and the energy density of silicon materials can reach more than 300wh/kg. However, both positive and negative electrode separators need technical improvements.

According to the above experts, range anxiety is inseparable from the low energy density of batteries. The current 18650 battery 3.7v 6000mah mileage can reach more than 300 kilometers, or even 400 kilometers. The improvement of energy density requires the improvement of positive and negative electrode materials, and the research on matching high-voltage electrolyte, high-temperature resistant and high-strength diaphragm, lithium replenishment process, 18650 battery 3.7v 6000mah safety control structure, system protection structure and other technologies. If there is no obvious technological breakthrough in the material of power 18650 battery 3.7v 6000mah, it will be difficult to make further breakthroughs after the energy reaches a certain level, and the negative impact on safety is getting bigger and bigger. Before the law of lithium 18650 battery 3.7v 6000mah fire is mastered, the balance between energy density, safety and long life cannot be ignored.

He believes that it is not feasible to increase the mileage of electric vehicles by increasing the power of 18650 battery 3.7v 6000mah packs, which will lead to adverse consequences such as strengthening structural parts, increasing vehicle weight, increasing driving energy consumption, reducing the safety of electric vehicles, increasing vehicle manufacturing costs, and longer charging time.

The industry generally believes that in addition to developing a direction to improve 18650 battery 3.7v 6000mah energy density, it is also necessary to focus on the construction of charging infrastructure. However, charging pile companies are currently having difficulty making profits, and the construction of charging piles has not made much progress, and the construction of charging infrastructure has become a shortcoming. There are problems of monopoly and inconsistent standards in the charging facility construction market, and there is no real consensus between car companies, power grid companies and the government. The State Council issued a document on August 1 to "accelerate" the pace of electric vehicle charging infrastructure construction, which is good news.

The above experts believe that the first thing to do is to solve the supporting issues. Convenient charging stations can greatly relieve the anxiety of car owners. Tesla's main charging method is the super charging station, with a charging voltage of 380V and a maximum charging current of nearly 200A. It can travel about 350 kilometers in one hour of charging, and the entire charging process only takes about one hour. my country began to fully open up the pure electric vehicle infrastructure construction market in 2014, encouraging social capital to invest in charging pile construction, and a large number of charging pile companies came into being. According to the statistics of the "China Charging Infrastructure Development Report 2017-2018", as of December 2017, the number of public charging piles was 214,000, an increase of 48.6% year-on-year, and the number of private charging piles was 232,000, totaling more than 440,000. The scale effect of the charging pile industry has already emerged, and the next step is to further optimize and improve it.

"It is difficult to make a profit from charging pile operations at present. In addition to technological leadership, business models also need innovation." A charging pile operator said. Although some leading companies have seized the opportunity to layout the charging pile industry and formed a competitive barrier to a certain extent, they need to invest huge and lasting funds. In addition, in the early stage of industry development, there are still problems such as long payback cycle and unclear profit model that are difficult to solve.

According to the survey, endurance anxiety troubles consumers and producers. One is because the charging facilities are not sound. The other is because the charging time is long. Electric vehicle charging is divided into fast charging and slow charging. Fast charging is high-power DC charging, which can fully charge 80% of the 18650 battery 3.7v 6000mah capacity in half an hour, but it will damage the 18650 battery 3.7v 6000mah. The slow charging process takes 6-8 hours. The long charging time seriously limits the range of electric vehicles. The vicious cycle formed by this is also the reason why charging pile companies are difficult to make profits. However, the huge space in the charging facility market still attracts a large number of private capital to continue to enter, which will accelerate the reshuffle of the charging infrastructure industry.

Many industry insiders believe that public charging piles are mainly suitable for special vehicles, public transportation logistics vehicles and other fields. In the future, the demand for private charging piles will increase. In addition to first-tier cities with scarce resources, the use of private charging piles in other regions will also be more extensive.

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