Basic knowledge of electric vehicles - power lithium-ion battery Lithium - Ion Battery Equipment

Introduction to Basic Knowledge of Electric Vehicles - Power Lithium-ion Batteries

The power lithium battery is the core of electric vehicles and the only source of driving energy for pure electric vehicles. It is directly related to the power performance and endurance of electric vehicles, and is also directly related to the safety of electric vehicles. From the perspective of the cost structure of new energy vehicles, battery drive systems account for 30-50% of the cost of new energy vehicles. Since the birth of electric vehicles, power lithium battery technology has been restricting the practical process of electric vehicles. Improving power density, energy density, service life and reducing costs has always been the core of the research and development of electric vehicle power lithium battery technology.(Lithium - Ion Battery Equipment)

Lithium-ion batteries are one of the most commonly used types of batteries in electric vehicles. Although they have not been around for a long time since their birth in 1970, they have quickly occupied the absolute majority of the electric vehicle battery market due to their high energy density and long cycle life. Most of the country. Nowadays, there are mainly two kinds of lithium-ion batteries equipped with electric vehicles on sale: lithium iron phosphate batteries and ternary lithium-ion batteries.

As a new energy vehicle manufacturing company integrating R&D, processing, sales and service, at present, the power lithium batteries for electric vehicles developed and processed by BAIC New Energy are mainly lithium iron phosphate batteries and ternary material batteries.

So what is the difference between lithium iron phosphate battery and ternary battery? Please come with me to explore it to the end~

【Appearance packaging】

Lithium-ion batteries can be divided into square batteries, soft pack batteries and cylindrical batteries.

【Material system】

At present, the mainstream lithium iron phosphate batteries and ternary material batteries refer to lithium ion batteries with lithium iron phosphate and ternary materials as the positive electrode materials, respectively. Ternary material refers to a positive electrode material with Ni, Co, Mn or Ni, Co, and Al three metal elements as core elements.


The lithium iron phosphate battery has an energy density of 120Wh/kg, and it is 80Wh/kg after grouping; the ternary lithium-ion battery has an energy density of 180Wh/kg, and the energy density is 110Wh/kg after grouping. From the data point of view, in terms of energy density, ternary lithium-ion batteries are superior to lithium iron phosphate batteries; in terms of cycle life, the two are equivalent, and the cycle life of a single cell is greater than 3000 times. The working conditions become harsh and complicated, and the lifespan will be reduced to a certain extent. The lifespan of the battery pack is equivalent to 6 years and 150,000 kilometers. The battery used in EV200 is a ternary lithium-ion battery.

At present, the energy density of lithium iron phosphate batteries has basically reached the theoretical limit, and the energy density of ternary batteries still has a lot of room for improvement. In terms of comprehensive capacity density, power density, cycle life, low temperature performance, etc., the comprehensive performance of ternary batteries is better than that of lithium iron phosphate batteries.



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