1. Large capacity: The capacity of 18650 lithium battery is generally between 1200mah ~ 3600mah, and the general battery capacity is only about 800mah. If combined into an 18650 lithium battery pack, the 18650 lithium battery pack can easily break through 5000mah.
2, Long life: 18650 lithium battery life is very long, the normal cycle life can reach more than 500 times, more than twice the ordinary battery.
3, High safety performance: 18650 lithium battery has high safety performance, no explosion, no combustion; non-toxic, no pollution, RoHS trademark certification; all kinds of safety performance in one go, cycle times greater than 500 times; good high temperature resistance, 65 degrees The discharge efficiency reaches 100%. To prevent battery short circuit, the positive and negative electrodes of 18650 lithium batteries are separated. So the possibility of its short circuit has been reduced to the extreme. A protection board can be added to avoid overcharging and overcharging the battery, which can also extend the battery life.
4. High voltage: The voltage of 18650 lithium battery is generally 3.6V, 3.8V and 4.2V, which is much higher than the 1.2V voltage of nickel-cadmium and nickel-hydrogen batteries.
Cons of Panasonic 18650 lithium battery
The biggest disadvantage of the 18650 lithium battery is that its volume has been fixed. It is not well positioned when it is installed in some notebooks or some products. Of course, this disadvantage can also be said to be an advantage. This is compared to other polymer lithium batteries and other lithium batteries. This is a disadvantage in terms of customizable and convertible sizes. Compared with some products with specified battery specifications, it has become an advantage.
The 18650 lithium battery is prone to short circuit or explosion, which is also relative to the polymer lithium battery. If it is relatively ordinary, this disadvantage is not so obvious.
Why is Panasonic's 18650 lithium battery used on Tesla?
What to do if the electric car is running for a long time and is running short of charge halfway through the road is all caused by too low energy density. Tesla's product concepts are different. They take the high-end to low-end route, so the performance requirements of the car are relatively high, and the mileage must exceed 200 miles. So the same goes for batteries.
Panasonic's 18650 lithium battery uses NCA as the positive electrode and has designed a complex battery management system to ensure and improve the efficiency and safety of battery work as much as possible. Tesla tested many types of batteries during battery development, but finally targeted the 18650 battery. The reason is not only that the 18650 battery has excellent performance, but Panasonic's price to Tesla is lower than cost.