Introduction to the Development Requirements of Lithium Battery for Different Uses

The current main market for lithium batteries is the application of portable terminal equipment. This has made high capacity the main direction of lithium battery development. However, under the background of the full development of electric vehicles and large-scale storage equipment, the main direction of lithium ion battery development is also diversified. trend.

Traditional mobile terminal markets, such as mobile phones and laptops, require high capacity because they often need to be recharged for a long time. Apple's iphone and ipad, which are popular all over the world, were criticized by consumers for not being used for a long time after charging. Therefore, when the new thenewipad was released, the original 6500mAh lithium battery was replaced with a 14000mAh large-capacity lithium battery. . This can be seen as the proof of the high-capacity direction of the development of rechargeable batteries for portable terminals. For this reason, even at the expense of life, high capacity is required, and the life expectancy is generally about 2 years.

However, the direction of research and development of lithium-ion batteries has changed since the advent of the electric car era. Nowadays, electric vehicles mainly include hybrid cars, plug-in hybrid cars, and pure electric vehicles. For hybrids, large power exchanges are required for acceleration and deceleration, so high-power batteries are ideal. On the contrary, pure electric vehicles rely only on powered lithium batteries to provide electricity, so they need large-capacity support, and plug-in hybrids are somewhere in between. This leads to the conclusion that in high-power lithium battery requirements, hybrid vehicles > plug-in hybrid vehicles > pure electric vehicles; In the case of large-capacity lithium batteries, the opposite is true. Pure electric vehicles > plug-in hybrids > hybrids. Of course, this is a comparison within different electric vehicles. Overall, lithium batteries for electric vehicles require several times the capacity and power requirements of portable terminals, as well as higher life expectancy and safety. In addition, it is impossible to enter the industrialization stage.

The performance requirements of large energy storage facilities for fixed devices are also several times higher than those of electric vehicles. In terms of safety alone, for building storage systems and domestic storage systems, it is necessary to have "high" safety performance that will not burn in the event of a fire., Electric vehicles and portable end-use lithium batteries clearly do not have this requirement. The interior of the energy storage facility used for fixed devices can also be divided into different main claims. For the grid power that is converted from the peak of the daytime discharge for night storage, large capacity batteries are required, such as lithium batteries for energy storage facilities for building systems. For photovoltaic and wind power generation, it is necessary to use high-power cells that have a high tolerance for output power changes. Because of natural factors, the output power of these two power generation devices has changed greatly.

With the transition and transformation of lithium batteries to large-scale applications, lithium batteries themselves have been unable to solve the fundamental problems. Therefore, lithium ion capacitors that combine the advantages of lithium ion batteries with traditional double-layer capacitors have emerged. There are also new technologies for the development of new Redox liquid-flow batteries in the phase of simultaneous development.

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