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Cylindrical 18650 lithium battery
18650 battery is a cylindrical lithium battery with a diameter of 18mm and a height of 65mm. Its biggest feature is that it has a very high energy density, almost 170 Wh / kg. Therefore, this battery is a cost-effective battery. This battery is often seen because it is a relatively mature lithium battery with good system quality stability in all aspects. It is widely used in battery capacity applications of about 10 kWh, such as in small appliances such as mobile phones and notebook computers. on.
21700 battery is a lithium battery with a diameter of 21mm and a height of 70mm. Because of its increased volume, space utilization becomes larger, and the energy density of the battery cell and the system can be improved. Its volume energy density is much higher than 18650. Type batteries, widely used in digital, electric vehicles, balanced vehicles, solar energy lithium battery street lights, LED lights, power tools, etc. Manufacturers of such batteries include Tesla, Samsung, Panasonic, BAK, and Lion New Energy.
Samsung 21700 Battery
18650 lithium battery advantages
18650 lithium battery has high safety performance, non-explosive, non-combustible; non-toxic, non-pollution, RoHS trademark certification; and high temperature resistance, discharge efficiency reaches 100% at 65 degrees.
The 18650 battery is generally packaged in a steel case. In extreme cases such as collisions of cars, it can minimize the occurrence of safety accidents and have higher safety.
The size of the 18650 cylindrical lithium battery cell is small, and the energy of each cell can be controlled in a smaller range. Compared with the use of a large-sized battery cell, even if a certain unit of the battery pack fails, the impact of the failure can be reduced. .
New 21700 battery has significant advantages
1. Lithium battery cell capacity increased by 35%. Taking the 21700 battery produced by Tesla as an example, after switching from the 18650 model to the 21700 model, the capacity of the battery cell can reach 3 to 4.8 Ah, a substantial increase of 35%.
2. The energy density of the battery system is increased by about 20%. According to the data disclosed by Tesla, the energy density of the 18650 battery system used in the early stage was about 250Wh / kg, and the energy density of the 21700 battery system produced later was about 300Wh / kg. The volume energy density of the 21700 battery was higher than the original 18650 Nearly 20%.
Our company also has Samsung 21700 Battery for sale, welcome to consult.
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