With the widespread application of ternary lithium batteries, the frequency of new energy vehicle charging misfires is also increasing, and everyone's focus on new energy vehicles has gradually shifted from cruising range to safety.
Ternary lithium battery is not recommended to be fully charged
Many people say that the lithium iron phosphate battery should be fully charged, and the ternary lithium battery should not be fully charged until more than 90. The reason is that the voltage of the lithium battery will increase after being fully charged, which will affect the activity of the electrolyte and the positive and negative materials, resulting in battery capacity attenuation. At the same time, the ternary lithium battery is not suitable for over-discharging, and it is best to charge it when the power is left at 30%.
Advantages and disadvantages of ternary lithium battery
The advantage of the ternary lithium battery is that the energy density per unit volume is higher than that of the lithium iron phosphate battery, and the energy density is the same as that of the lithium iron phosphate battery. The volume of the ternary lithium battery is smaller, and the ternary lithium battery of the same size can provide higher Continue.
In addition, the cyclic charge and discharge performance of the ternary lithium battery is better. Under normal circumstances, it can be charged and discharged more than 2000 times. In addition, the ternary lithium battery has a high energy density, and the charging frequency will be relatively lower. In other words, the service life will be longer.
In addition, the ternary lithium battery is not afraid of cold, so the battery life is better than that of the lithium iron phosphate battery in winter.
The reaction between the active lithium of the ternary lithium battery and the electrolyte will release heat, so the disadvantage of this battery is that it is easy to generate heat. However, as long as you don't apply too much charging current, and there is a cooling system on the battery, the heat released by the reaction will not pose too much threat.
It's just that the pursuit of shortening the charging time is now ignorant, and the charging power of fast charging is getting larger and larger, which will cause the battery to generate heat much faster than the heat dissipation. High temperature will cause lithium ions to precipitate too quickly to form dendrite-like crystals. These crystals will pierce the separator between the positive and negative electrodes to form a short circuit, and generate high temperature in a short time to cause spontaneous combustion.
At present, the biggest factor restricting the ternary lithium battery is the high production cost, including the high cost of raw materials and the cost of thermal management system, so the price of the whole vehicle will be high. Coupled with less subsidies, the cost is on consumers. At present, ternary lithium batteries are mainly used in mid-to-high-end pure electric vehicles.