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In the cold winter, a "Rashomon" about Tesla's lithium iron phosphate battery mileage discount is being staged.

A few days ago, some Beijing car owners reported that the actual endurance mileage of the home-made Model3 they just bought was only about 200 kilometers, which was almost half of the official 468 kilometers NEDC endurance mileage. Tesla China said to Shanghai Securities News that it did not respond to this matter at present.

However, Tesla insiders, Ningde Times, industry experts and car owners gave different opinions.

each sticks to his argument

The Beijing car owner said that under the current weather conditions in Beijing, short distance driving in the city is the main thing, and each time the car is used, it is about 4 kilometers. Vehicles are parked in the garage at night and on the ground during the day. After fully charged, the Model 3 he purchased shows a 420km endurance, but after 241km, the remaining 5% of the electricity is consumed, indicating a 39 kWh power consumption. This range obviously falls short of consumers' expectations.

According to the public information, the first batch of domestic Model 3 models equipped with Ningde Era batteries was delivered at the end of October. The capacity of lithium iron phosphate battery carried by the model was 55 kilowatt hours, the power consumption per hundred kilometers was 12.6 kilowatt hours, and the range under NEDC conditions was 468 kilometers, an increase of 22 kilometers compared with the previous version of ternary lithium battery.

Tesla Shanghai store sales told the Shanghai Securities News that at present, there are still a small number of Model 3 models with ternary lithium batteries on sale, but most of the domestic Model 3 models on sale are already new cars equipped with Ningde era lithium iron phosphate batteries.

Tesla China said to Shanghai Securities News that it has had good communication with the car owners in Beijing, but has not responded to this incident at present.

For Ningde Times, the Shanghai Securities News said that its lithium iron phosphate batteries met the quality standards and the requirements of the vehicle enterprises.

"The case of 240 kilometers should be caused by a combination of factors, including use, environment and battery characteristics." Tesla insiders told Shanghai News that the driving habits, local environment and road conditions of the car owners will affect the actual driving mileage.

In addition, the person expressed different opinions on Tesla's omission of vehicle test and other verification links, saying that all Tesla models passed various national inspection standards.

"Like automobile fuel consumption, the actual mileage of electric vehicles is also related to everyone's driving habits." A senior auto appraiser said that, like fuel vehicles, there are fuel efficient drivers and fuel consuming drivers. If electric vehicles turn on thermal air conditioners and various applications as soon as they get on the bus in winter, they will consume power quickly. It can be said that the range of electric vehicles is related to the driving style, location and ambient temperature of the specific driver.

An automobile industry expert told the Shanghai Securities News that the battery's endurance mileage is closely related to the average energy consumption of electric vehicles. If you want to further investigate the endurance of Tesla's domestic lithium iron phosphate battery made in Ningde Times, you can conduct a comprehensive test on the average energy consumption of related electric vehicles, and on this basis, further judge the battery's endurance under different working conditions.

In addition, some insiders said that Tesla Model3, a lithium iron phosphate version, was suspected of being launched in a hurry. It is said that the development cycle of the previous Tesla 21700 battery was 23 months, while the lithium iron phosphate battery provided by Ningde Times took only 9 months from demand to actual mass production and loading.

Rapid rise of lithium iron phosphate battery

As the main technical route of electric vehicle battery, the thermal stability of lithium iron phosphate is the best among the current automotive lithium batteries: when the battery temperature is above 500 ℃, its internal chemical composition starts to decompose. In contrast, the thermal runaway temperature of ternary lithium batteries is lower than 300 ℃, and some high nickel batteries are even lower than 200 ℃, so the risk of spontaneous combustion of lithium iron phosphate batteries during impact and rapid charging is lower.

Although compared with ternary lithium battery, lithium iron phosphate battery has the advantages of low cost and good safety, but it also has the problems of relatively low energy density and easier power attenuation at low temperatures. According to relevant research, under the same winter low temperature conditions, the range of vehicles equipped with ternary lithium batteries will be reduced by 25%, and the lithium iron phosphate version may reach as much as 35%.

It is precisely because of these defects that lithium iron phosphate battery was regarded as the representative of low-end battery in previous years, and only a few manufacturers used it in low-end models.

However, in 2020, the situation has changed rapidly. With the improvement of lithium iron phosphate battery technology, its performance has been recognized by mainstream automobile enterprises. At the beginning of 2020, BYD Chairman Wang Chuanfu announced the launch of lithium iron phosphate "blade battery", which will soon be used in BYD "Han" and other major electric vehicles. At the same time, Tesla also chose the lithium iron phosphate battery of Ningde era as the supplier of the domestic Model 3 standard.

After the price dropped to about 250000 yuan, the monthly sales of Tesla domestic Model3 in the past two months reached about 20000 units. At the same time, the domestic Model3 equipped with lithium iron phosphate battery also landed in the cold winter European market on November 26, and the subsequent performance of these vehicles in this winter deserves attention.

The picture shows a new Tesla Model 3 equipped with lithium iron phosphate battery produced by Ningde Times, ready to be exported to Europe.

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