Why do new energy vehicles favor nickel-metal hydride batteries?

1. The nickel-hydrogen battery is safe and reliable. 1) The nickel-hydrogen battery electrolyte is a non-flammable aqueous solution. The nickel-hydrogen battery has a relatively high specific heat capacity, relatively high heat of evaporation of the electrolyte, and relatively low energy density. The battery has a small temperature rise and will not burn. 2) The product quality control of Ni-MH battery is less difficult, and the possibility of defects due to the manufacturing process is low. 3) By the end of 2014, the proportion of hybrid electric vehicles suitable for nickel-metal hydride batteries was as high as 73%. There are more than 8 million hybrid electric vehicles equipped with hydrogen-inlaid batteries worldwide. Most of Toyota hybrid vehicles use hydrogen-inlaid batteries. During the operation of more than 8 million vehicles per year, there has never been a serious safety accident. Toyota's Prius, a representative of commercial hybrid vehicles, uses a special charging and discharging procedure to make the battery charge and discharge lifespan sufficient for the vehicle to last for ten years. Nickel-hydrogen battery is not only the most mature and most commercially-applied battery among the three recognized systems, but also the first choice for hybrid vehicles. Other hybrid vehicles that use nickel-metal hydride batteries include: FordEscape from Ford; ChevroletMalibu from Chevrolet; HondaCivicHybrid from Honda; nickel-metal hydride batteries have good fast charging performance; 3. nickel-metal hydride batteries have good low temperature performance (1) low temperature discharge nickel Hydrogen battery adopts alkaline electrolyte aqueous solution, which can discharge at -40℃ at the lowest, 2C~3 discharge at -20℃. Lithium battery adopts organic electrolyte solution, the resistance increases rapidly at low temperature, the performance at 0C has been greatly attenuated, and it cannot meet -10℃ Under normal use requirements. (2) Low-temperature charging Low-temperature fast-charging nickel-metal hydride batteries can be charged at a minimum of -40℃, 1C fast charging above -30℃, 3C or 2C fast charging above -20℃. Lithium batteries cannot be charged at -5°C, otherwise it will easily lead to safety risks. 4. Ni-MH batteries are environmentally friendly and recyclable. Ni-MH batteries do not contain highly toxic substances. The main components are nickel and rare earths. They have high recovery value (with residual value), and are difficult to recover. Basically all of them can be recycled and reused. Can continue to develop. Compared with lead-acid batteries, nickel-metal hydride batteries have a larger energy density ratio, which means that the use of nickel-metal hydride batteries can effectively extend the driving time of the vehicle without adding extra weight to the new energy vehicle. Secondly, the discharge characteristics of nickel-metal hydride batteries are stable, the discharge curve is very smooth, and the heat generation is small. These are the advantages of nickel-metal hydride batteries, and they are also the basis for new energy vehicles to use them as batteries. His disadvantage is that the energy density is relatively low, that is, slightly heavier with the same power and weight, but this is acceptable in hybrid vehicles. At present, battery technology is still the core bottleneck of pure electric vehicles. Lithium batteries are not stable enough. Many batteries have a rapid decline in performance after a period of use. The battery needs to be replaced, and the price of the battery itself is very high. At the same time, the safety of batteries is of great concern to consumers. Fire and explosion incidents of pure electric vehicle batteries have occurred repeatedly, which has greatly compromised the safety of consumers. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous post: What are the uses of lithium battery termination tape?