The electric energy released by the average unit volume or mass of a battery. Generally, in the same volume, the energy density of lithium-ion batteries is 2.5 times that of nickel-cadmium batteries and 1.8 times that of nickel-hydrogen batteries. Therefore, when the battery capacity is equal, lithium-ion batteries will be better than nickel-cadmium and nickel-hydrogen batteries. Smaller size and lighter weight.

　　The electric energy released by the average unit volume or mass of the battery. Generally, in the same volume, the energy density of lithium-ion batteries is 2.5 times that of nickel-cadmium batteries and 1.8 times that of nickel-hydrogen batteries. Therefore, when the battery capacity is equal, lithium-ion batteries will be better than nickel-cadmium and nickel-hydrogen batteries. Smaller size and lighter weight.

　　Battery energy density = battery capacity x discharge platform/battery thickness/battery width/battery length.

　　Which power battery energy density technology company is strong?

　　BYD

　　Ternary lithium battery, and if the technology of the ternary lithium battery is combined with the lithium iron phosphate battery, and some adjustments are made to the original practice of using graphite as the negative electrode material, then in 2020 or so, BYD plans to change the monomer of the lithium iron phosphate battery The energy density is increased to 200Wh.

　　In addition, BYD's ternary battery has the conditions for mass production, and the current energy density has reached 200Wh/kg. The goal of BYD's ternary battery is to reach 240Wh/kg in 2018 and 300Wh/kg in 2020.

　　Waterma

　　The 32650 cylindrical power lithium iron phosphate battery produced has a single energy density of 145Wh/kg, and the next step is to achieve 160Wh/kg; the current energy density of the ternary battery is 200Wh/kg, and it is expected to reach 300Wh/kg by 2020 level.

　　National Energy Battery

　　As early as 2013, the energy density of Guoneng's lithium iron phosphate and ternary battery cells reached 160Wh/kg and 200Wh/kg. It is estimated that by the end of 2017, the energy density of lithium iron phosphate batteries will reach 180Wh/kg, PACK will reach 134Wh/kg, and the energy density of ternary batteries will exceed 240Wh/kg.

　　Gateway Power

　　In terms of energy density, the company has mass-produced ternary soft-pack battery cells with a specific energy of 210WH/Kg. On the basis of improving battery safety, it is expected that in 2020 the company's soft-pack battery cell energy density can reach 300WH/Kg, and the pack can reach 220WH/Kg; the lithium titanate battery cell energy density will reach 110WH/Kg or more.

　　Smart Energy

　　The energy density of the company's mass-produced power battery monomer can reach 220Wh/Kg, and the energy density of the PACK can reach 140Wh/Kg. At the same time, the company's BMS system can achieve 5 levels of protection, the battery pack adopts lightweight materials, and the structure is optimized.