Development status and trend of power battery
With the continuous increase in the sales of new energy vehicles in China, and the continuous updating of battery technology. As the heart of new energy vehicles, power batteries are also divided into different types due to differences in raw materials. For example, lead-acid batteries, nickel-cadmium batteries, nickel-hydrogen batteries, and lithium batteries, etc., are widely used in a certain stage of the development of the automobile industry by virtue of their respective advantages. At present, the mainstream power battery in the market is a lithium battery. So, what are the advantages and disadvantages of lithium batteries? How will the future battery technology develop?
Lithium iron phosphate battery is a kind of lithium battery. At present, some electric vehicle manufacturers such as BYD e6, Beiqi ev160 and Tengshi have used it as the power source of vehicles. The thermal stability of lithium iron phosphate battery is the best among the current lithium battery. When the battery temperature is at 500-600 °C, the internal chemical composition begins to decompose, while the lithium cobalt oxide battery of the same lithium battery is 180-250. The internal chemical composition is already unstable at °C. In other words, the safety of lithium iron phosphate batteries is second to none in lithium batteries, which is why it has become one of the main categories of electric vehicle batteries.
The ternary lithium battery used by Tesla MODEL S has a weight energy density of about 200 Wh/kg, while the lithium iron phosphate battery has an energy density of about 150 Wh/kg, which means that the same weight of the ternary lithium battery is better than the lithium iron phosphate battery. The cruising range is longer. However, when the temperature of the ternary lithium battery is 250-350 ° C, its internal chemical composition begins to decompose, so higher requirements are imposed on the battery management system. Take the Tesla MODEL S model as an example. The vehicle is equipped with more than 7,000 18650 ternary lithium batteries. The battery management system should monitor the use status of each battery, which undoubtedly increases the control difficulty of the battery management system.
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