18650 battery 3.7v 1800mah

　　Why are ternary 18650 battery 3.7v 1800mah favored by Tesla? What is the development direction of battery technology in the future?

　　Lithium iron phosphate battery is a type of lithium battery. Currently, some electric vehicle manufacturers such as BYD e6, BAIC ev160, and Denza use it as the power source of their vehicles. The thermal stability of lithium iron phosphate batteries is the best among current automotive 18650 battery 3.7v 1800mah. When the battery temperature is at a high temperature of 500-600°C, its internal chemical components begin to decompose, while lithium cobalt oxide batteries, which are also 18650 battery 3.7v 1800mah, have a temperature of 180-250°C. At ℃, the internal chemical composition is already in an unstable state. In other words, the safety of lithium iron phosphate batteries is second to none among 18650 battery 3.7v 1800mah, and for this reason, it has become one of the main categories of electric vehicle batteries.

　　Why are ternary 18650 battery 3.7v 1800mah favored by Tesla?

　　[Dry information] A brief analysis of new energy vehicle batteries and an overview of future technologies

　　The weight energy density of the ternary lithium battery used in Tesla MODELS is about 200Wh/kg, while the energy density of the lithium iron phosphate battery is about 150Wh/kg, which means that the ternary lithium battery of the same weight has a higher energy density than the lithium iron phosphate battery. Longer cruising range. However, when the temperature of the ternary lithium battery itself is 250-350°C, its internal chemical components begin to decompose, thus placing higher requirements on the battery management system. Taking the Tesla MODELS model as an example, the vehicle is equipped with more than 7,000 18650 ternary 18650 battery 3.7v 1800mah. The battery management system must monitor the usage status of each battery, which undoubtedly increases the difficulty of controlling the battery management system.

　　Fuel cells are the most ideal energy source for future cars

　　[Dry information] A brief analysis of new energy vehicle batteries and an overview of future technologies

　　A fuel cell is a power generation device that converts chemical energy into electrical energy, not what is commonly known as a battery. Its energy source mainly relies on the continuous supply of fuel and oxidant. It has high energy conversion efficiency, no pollution, long life and stable operation. It is recognized by the industry as the best energy source for future automobiles.

　　As far as today's market is concerned, fuel cell vehicles are not far away from us. At the end of last year, Toyota Motor Company officially launched the hydrogen fuel cell vehicle MIRAI (Future) in Japan. Its cruising range can reach about 700km and it only emits water during driving. The working principle of MIRAI is: the hydrogen in the hydrogen storage tank reacts with the oxygen inhaled by the front of the vehicle in the fuel cell, and the generated electrical energy drives the motor to drive the vehicle, and the remaining electrical energy generated by the reaction is stored in the energy storage battery. The two gas storage tanks located at the rear of the car body can store up to 5 kilograms of hydrogen fuel. Under normal circumstances, hydrogen fuel replenishment can be completed in 3 minutes.

　　Prospects for new battery technologies: physical batteries

　　Physical batteries are a general term for batteries that rely on physical changes to provide and store electrical energy. For example, supercapacitors that are fully charged instantly and flywheel batteries with specific power of 5000-10000W/kg are all members of the physical battery family.

　　1. Supercapacitor

　　Supercapacitor is a power component between traditional capacitors and batteries. Its power density is as high as 300-500W/kg, which is 5-10 times that of ordinary batteries. It mainly relies on an electric double layer and a redox pseudocapacitor charge to store electrical energy without any chemical reaction, so it is classified as a physical battery. Compared with chemical batteries, supercapacitors have three obvious advantages:

　　① It can be charged and discharged repeatedly up to 100,000 times (traditional chemical batteries only have hundreds to thousands of times), and its lifespan is much longer than that of chemical batteries;

　　②Supercapacitors have extremely high power density when charging and discharging, and can release a large amount of electric energy instantly, which can meet the wider power needs of vehicles;

　　③ Better adaptability to the working environment. Usually, it can work stably and normally when the outdoor temperature is -40℃~65℃ (traditional batteries are generally -20℃~60℃).

　　2. Flywheel battery

　　[Dry information] A brief analysis of new energy vehicle batteries and an overview of future technologies

　　Flywheel battery is a new concept battery proposed in the 1990s. It uses a principle similar to that of generating energy when a flywheel rotates to achieve charging and discharging. The famous Porsche 911 GT3 hybrid racing car and the Porsche 918 Spyder, which is rated as one of the four great cars today, are equipped with flywheel batteries at the two front wheels. The flywheel technology converts the kinetic energy collected by braking into electrical energy and stores the energy in a In the flywheel. During acceleration, this energy is transferred to the front wheels, improving acceleration while reducing fuel consumption of the internal combustion engine.

　　Due to the limitations of technology and material prices, the price of flywheel batteries is relatively high, and its advantages cannot be reflected in small occasions. However, flywheel batteries have been gradually used in space, large-scale transportation, and special applications where large-scale energy storage devices are needed.

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