At present, there are two mainstream battery technology routes in new energy vehicles, lithium iron phosphate batteries and ternary lithium batteries, although these two batteries compete in many application fields, but the competition in the field of new energy vehicles as the main line, because this is the largest lithium battery application scenario in China, since to compete, there must be a comparison because the energy density is large, the weight is much smaller. Light weight and small space occupancy determine that ternary lithium battery new energy vehicles consume less power, so they are faster and have better endurance. Therefore, the car can run farther with ternary lithium batteries, and the lithium iron phosphate new energy vehicles are still basically used for city buses, because the battery life is not far, and the charging pile can be charged within a short distance.
The use of lithium iron phosphate batteries in passenger buses is more core based on safety considerations. In the event of an extreme collision, a short circuit caused a fire. The material of lithium iron phosphate will not burn when it encounters short circuit, and the high temperature resistance is much superior to the ternary lithium battery.
Also because the energy density is large, the weight is also much smaller, the light weight and the small space occupied determine that the ternary lithium battery new energy vehicles consume less power, so the speed is faster and the endurance is stronger. Therefore, the car can run farther with ternary lithium batteries, and the lithium iron phosphate new energy vehicles are still basically used for city buses, because the battery life is not far, and the charging pile can be charged within a short distance.
Low temperature lithium iron phosphate battery 3.2V30Ah
Charging at -20℃, discharge capacity of 3C at -40℃ ≥70%
Charging temperature: -20~45℃
- Discharge temperature: -40~+60℃
-40℃ supports maximum discharge rate: 3C
-40℃ 3C discharge capacity retention rate ≥70%
Although the lithium iron phosphate battery is resistant to high temperature, but the ternary lithium battery low temperature performance is better, is the main technical route for the manufacture of low temperature lithium batteries, at minus 20°C, the ternary lithium battery can release 70.14% of the capacity, while the lithium iron phosphate battery can only release 54.94% of the capacity, and due to the low temperature conditions, The discharge platform of ternary lithium battery is much higher than that of lithium iron phosphate battery voltage platform is also faster to start.
Charging efficiency, ternary lithium battery is higher. Lithium battery charging is the use of current limiting voltage method, that is, in the first stage to do constant current charging, this time the current is large, high efficiency. After constant current charging reaches a certain voltage, it enters the second stage of constant voltage charging, at this time, the current is small and the efficiency is low. Therefore, to measure the charging efficiency of the two, the ratio of constant current charging power to the total capacity of the battery is called the constant current ratio. Experimental data show that there is little difference between the two when charging under 10C conditions, but more than 10C will open the distance, at 20C charging, the constant current ratio of ternary lithium battery is 52.75%, the constant current ratio of lithium iron phosphate battery is 10.08%, the former is 5 times the latter. In terms of cycle life, lithium iron phosphate batteries are better than ternary lithium batteries, the theoretical life of ternary lithium batteries is 800 times, but basically to 500 cycles, the capacity decays to 60%; The lithium iron phosphate battery has 80% capacity after the same cycle.
The comparison of the above aspects can roughly conclude that the comparative advantages of the two help to answer the question of which ternary lithium battery and lithium iron phosphate battery are good
Lithium iron phosphate battery safety, long life, high temperature resistance; The ternary lithium battery is light in weight, high in charging efficiency and low temperature resistance, and the respective adaptability of the two due to the difference between them is the reason for the coexistence of the two.
leave a message
