Fuel cell PK lithium ion batteries

Source: 2020 - 03 - 29 direction hits: fuel cell PK lithium-ion battery current, dynamic and global environment system faces enormous challenges. Among them, as the oil consumption and co2 emissions, the main source of the car industry is faced with a revolutionary innovation. To pure electric technology, including fuel cell technology as the main technical direction of new vehicles has become the consensus of the world. Fuel cell car is another important direction of the electric car batteries, compared with the lithium ion battery, we can see clearly obvious between the advantages and disadvantages. First of all, from the perspective of security. Hydrogen fuel cell safety hazard: leakage and control is the main source of fuel cell system safety hazard, this is reason, on the physical plane and lithium ion battery safety hazards is the cause of the chemical level, this is due to uncontrollable chain reaction. Because the chain reaction speed very short. In terms of control, control of lithium ion battery is higher than the fuel cell. But in the case of collision, damage is greater. Of course, this is just a theory. Due to hydrogen itself has the characteristics of rapid evolution, so the leak time is very short, and high pressure hydrogen gas bottle has a height adjustment function such as impact resistance, prevent fall, anti impact, also to ensure the safety supply. Secondly, from the Angle of the function at low temperature. When the electrolyte increases viscosity under low temperature, conductivity, leads to the polarization resistance of the battery increases sharply. Manufacturers generally don't recommend below zero discharge behavior, so need external heat source in response to low temperature lithium-ion batteries. Fuel cell low-temperature start function is poor, but with the increase of startup itself after heat, will soon be stable during the 80 - reactor temperature Normal operating temperature range of 90 ℃. However, under the premise of how to use external auxiliary power without complete start in low temperature fuel cells, especially start at low temperature is an important research topic. Third, from the point of view of capital on price. Generally speaking, the fuel cell and lithium ion batteries are more expensive than traditional power supply. Especially the hydrogen source of complexity and rigour, storage and safe use of hydrogen fuel cell costs are high, it difficult to get advantage in the short term. According to production data, the cost of lithium-ion battery will eventually break through 1000 yuan/KWH; The cost of fuel cell is still high, hope in the long run, a lot of fuel cell can be close to the price of the internal combustion engine. Fourth, the charging time. Charging time long has been the lithium ion battery indelible pain points. In a typical charging mode, the use of lithium ion battery cars need three to eight hours to recharge. For example, the fuel cell regeneration can be in three to five minutes. Fifth, distance. This may be an all-electric car the biggest pain points, especially the lithium ion battery. With higher energy density, weight is lighter than a fuel cell, the traditional lithium-ion batteries are hard to break through 500 kilometers. Sixth: temperature effect. Fuel cell vehicles can be through the study of the heat of the whole car management to maintain the same range as the summer, this is the lithium ion battery. Lithium ion battery, whether by PTC heating or air conditioning, consumes electricity. Fuel cells for power supply, air conditioning in the summer for the cabin heating in winter. So in theory, should the winter than the summer long. Based on the Rankine cycle is now on the study of the waste heat power generation, if the study is completed, will further improve the fuel cell power. Seven: the balance of the capital. Fuel cells, unlike all-electric cars cost balance, passenger car about 500 kilometers, commercial vehicle, about 100 km