What is the battery energy density? What level of energy density has the lithium battery business reached? With the gradual popularity of pure electric vehicles, the shortcomings of their short range and long charging time are becoming increasingly prominent. Many manufacturers often use battery energy density as a publicity gimmick in order to highlight the long range and performance of their own products. For the industry, whether the battery energy density can be improved seems to restrict the future development of pure electric vehicles.
In the past few years, whether it is new energy vehicles, or the density of lithium batteries, are constantly changing, the ownership of new energy vehicles is also increasing, for the vehicle range is also increasingly high, the range of electric vehicles and energy density is a certain relationship.
What is battery energy density?
Battery energy density refers to the amount of energy stored in a certain space and how much electricity can be released in an average unit. Under the same volume or weight, the higher the energy density of the battery, the more power it can store and the longer the range of the electric car. Therefore, battery energy density has a great impact on the range of electric vehicles, and the state also puts forward certain requirements for the energy density of new energy vehicle power batteries in the form of subsidies.
Battery energy density has high technical requirements, if this value is larger means more energy storage, while the weight of the battery is also small, which has a positive impact on the overall energy consumption of the car, while the safety performance is also a great challenge. The energy density of lithium batteries is generally divided into two dimensions: weight energy density and volume energy density.
Battery weight energy density = battery capacity × discharge platform / weight, the basic unit is Wh/kg
Battery volume energy density = battery capacity × discharge platform / volume, the basic unit is Wh / L
The higher the energy density of the battery, the more power is stored in the unit volume, or weight.
What level of energy density have the lithium battery companies reached?
At this stage, most of the battery system used by car companies mass energy density between 130-150Wh/kg, the highest can reach 160Wh/kg. by 2020, China's power battery monomer specific energy to reach more than 300wh/kg, and strive to achieve 350wh/kg, system specific energy strive to reach 260wh/kg, cost down to less than 1 yuan / watt hour goal.
BYD: lithium iron phosphate battery monomer energy density of 150Wh, and the next BYD plans to continue to increase the energy density to 160Wh. in addition to lithium iron phosphate battery BYD is also developing ternary lithium batteries, and if the ternary lithium battery technology combined with lithium iron phosphate battery, the original practice of graphite as the anode material to make some adjustments, then in 2020 or so BYD plans to increase the energy density of lithium iron phosphate battery monomer to 200Wh.
Jetway Power: In terms of energy density, the company has already mass-produced ternary soft pack battery monomer specific energy of 210WH/Kg. On the basis of improving battery safety, it is expected that in 2020, the company's soft pack battery monomer energy density can reach 300WH/Kg, after Pack into groups can reach 220WH/Kg; lithium titanate battery monomer energy density reaches more than 110WH/Kg.
Wotema: the production of 32650 cylindrical power lithium iron phosphate battery, the single energy density has reached 145Wh/kg, the next goal is to achieve 160Wh/kg; ternary battery energy density of 200Wh/kg, is expected to reach the level of 300Wh/kg by 2020.
The biggest benefit of improving the energy density of lithium battery is to increase the comprehensive range of pure electric vehicles, to solve the problem of "mileage anxiety" of consumers about new energy vehicles, after the future charging infrastructure of new energy vehicles is relatively perfect, coupled with the improvement of the energy density of new energy vehicles, will be the future of the new energy vehicle industry. The main development direction of the future new energy vehicle industry.
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