Lithium iron phosphate batteries and compared the advantages and disadvantages of the ternary lithium batteries

Source: 2020 - 04 - 20 thus hits: once the use of new energy car battery technology, there are two main types of lithium iron phosphate batteries and ternary lithium batteries, although the two batteries can substitute in many places, but most still is given priority to with new energy vehicles, because this is the nation's largest lithium battery application scope, so it is necessary to do a comparison, battery performance compared with the prices of cars, can be carried out from the function compares the ternary lithium battery and lithium iron phosphate battery which is good, is by setting conditions, came to the conclusion that the real data of the two kinds of battery is clear. According to relevant laboratory, new energy automobile manufacturers, power battery manufacturers of the experimental results show that although each testing inevitably exist on the nuances of the detailed parameters, but for the two batteries to have consistent quality difference. To this end, we take on behalf of the parameters are compared. Ternary lithium battery VS lithium iron phosphate battery lithium iron phosphate batteries and the difference between the ternary lithium battery 1. Byd is a passenger car, tesla is a passenger car. This is the volume difference. According to the current technology, the ternary lithium battery energy density is commonly 200 wh/kg, the future may reach 300 wh/kg. The current lithium iron phosphate battery basic in 100 ~ 110 wh/kg, some can reach 130 ~ 150 wh/kg, but it is hard to break through 200 wh/kg. 2. And, because of the large energy density, the weight is much smaller. Light weight, small size, determines the ternary lithium battery of new energy vehicles less consumption, high speed, strong ability in life. Therefore, the use of the ternary lithium battery car can go further, and new energy vehicles lithium iron phosphate were still largely used on city buses, because time range, need in short distance charge within the charging pile. 3. Of course, for security reasons, use lithium iron phosphate batteries on passenger bus more necessary. Tesla motors has been more than a fire accident happened. Reason is that tesla's battery pack is consists of about 7000 18650 ternary lithium battery. If the battery or the battery internal short circuit of these units, can cause fire. And the lithium iron phosphate material in short circuit will not burn, high temperature resistant performance is far superior to the ternary lithium battery. 4, lithium iron phosphate batteries, and high temperature resistance, but the ternary lithium battery low temperature resistant performance is good, is one of the main technical route, the production of lithium ion battery - at low temperature 20° C, the ternary lithium battery can release of production capacity of 70. 14%, and lithium iron phosphate batteries can only release 54. 94% of capacity, and because of the low temperature condition, the ternary lithium battery discharge platform than lithium iron phosphate battery voltage startup faster. 5. Charging efficiency is high, the ternary lithium battery is higher. Lithium battery is the method that USES current limiting voltage, namely in the first stage to do constant current charging, the current is big, high efficiency. After reaching a certain voltage constant current charging, constant voltage charging into the second stage. At this point, the current is small, efficiency is low. Therefore, in order to measure the charging efficiency, using constant current charging ratio with a total capacity of the battery capacity, is called a constant current ratio. Experimental data show that under the condition of 10 c charging, both differ not quite, but there will be more than 10 c difference. Charging 20 c, ternary lithium battery of constant current ratio of 52. 75%, lithium iron phosphate batteries constant current ratio of 10. Five times as many as 08%, the former is the latter. 6. In terms of cycle life, lithium iron phosphate battery is better than that of the ternary lithium battery. Ternary lithium batteries of theoretical service life of 2000 times that of ordinary lithium batteries. Even if is the best of the industry brand tesla, after 3000 times also can maintain 70% of the battery, and lithium iron phosphate batteries in the same cycle after can still maintain 80% of the battery. The comparison of the above six aspects can be roughly concluded that both comparative advantage can help answer questions on which is better, the ternary lithium battery or lithium iron phosphate battery: the lithium iron phosphate batteries are safe, long life, high temperature resistant; Ternary lithium battery charge light weight, high efficiency, low temperature resistant.