18650 lithium battery and soft pack battery, who will be suitable for electric vehicles?

　　18650 lithium battery and soft pack battery, who will be suitable for electric vehicles? Now which battery is more suitable for electric vehicles, which battery will be more able to seize the automotive power battery market. Today, we compare the classic 18650 lithium battery with the soft battery, which is more suitable for electric vehicles and becomes the king of power batteries.

　　1、 18650 Difference between lithium battery and soft pack battery

　　As a world famous electric vehicle brand, why do they choose different power batteries? In the field of automotive power battery application, what are the advantages and disadvantages of 18,650 lithium battery and soft pack battery? As a world famous electric vehicle brand, why do they choose different power batteries? In the field of automotive power battery application, what are the advantages and disadvantages of 18,650 lithium battery and soft pack battery? The difference of electrolyte morphology is the key. As two mainstream power batteries in the market, 18,650 lithium battery and lithium polymer flexible packaging battery are differentiated according to the packaging materials of the shell. The 18650 battery is usually enclosed in a steel shell (18 indicates a diameter of 18mm, 65 indicates a length of 65mm, and 0 indicates a cylindrical battery). The structure of the inner electrode sheet and the diaphragm is wound. The outer package of lithium polymer flexible packaging battery adopts aluminum plastic film, and the inner electrode sheet and diaphragm are stacked (stacked layer by layer). Although the shape and internal structure are different, the principles of the two batteries are basically the same. Both batteries have positive, negative and electrolyte. The cathode material is generally lithium cobalt oxide, lithium nickel cobalt manganate (ternary material), lithium iron phosphate or lithium manganate, the cathode material is generally graphite, and the electrolyte is lithium hexafluorophosphate solution. The main difference between the two is that the electrolyte of a material inside the battery is different: the electrolyte inside the lithium polymer flexible battery is polymer, usually gel or solid, while the electrolyte in the 18650 battery is usually liquid. Each method has its advantages and disadvantages. Different application fields. 18650 lithium battery and lithium polymer soft pack battery have their own advantages and disadvantages. At present, the 18650 battery has a high degree of automation, and its consistency and safety have reached a high level. In addition, the battery itself is small in size and light in weight, which has unique advantages in the modular and standardized aspects of system development.

　　2、 At present, 18650 lithium battery is a more suitable choice

　　Many people believe that using 18,650 batteries as the power source of new energy electric vehicles is the best choice at this stage. However, the 18650 battery also has an inevitable disadvantage, that is, the unit capacity is low (generally about 2-4ah). This makes 18650 batteries require a large number of batteries in applications, and the battery management system to maintain battery consistency and battery cooling is more complex. Compared with 18650 battery, lithium polymer flexible packaging battery has the advantages of higher monomer capacity, thinner, arbitrary area, arbitrary shape, etc. (0.33mm, 0.50mm and other ultra-thin batteries can be made). Its main disadvantages are poor consistency and poor mechanical strength. Based on the characteristics of lithium polymer batteries, lithium polymer batteries are increasingly used in mobile phones, laptops, mobile power and other fields. However, due to the poor conductivity and large internal resistance of colloidal (or solid) electrolyte, lithium polymer soft packed batteries are rarely used in electric vehicles. Flexible packaging batteries are not all lithium polymer batteries. Since lithium polymer flexible battery is rarely used in electric vehicles, what type of battery is the sandwich flexible battery of Nissan LEAF? In fact, although lithium polymer flexible packaging batteries are usually called flexible packaging batteries because they can also use liquid electrolytes, not all flexible packaging batteries are lithium polymer batteries. Nissan LEAF battery is a flexible battery pack with liquid electrolyte. Whether it is a lithium polymer flexible packaging battery or a flexible packaging battery whose internal material is liquid electrolyte, the flexible packaging battery is usually packaged with aluminum plastic film. Aluminum plastic film has thin thickness and poor mechanical strength. In extreme cases such as automobile collision, aluminum plastic film is very easy to be damaged and lead to accidents, which is the main defect of flexible packaging batteries for new energy vehicles.

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