Depth: Develop a 400 volt voltage platform Audi-Etron charging efficiency

August 2020, in October, the New Energy Intelligence Analysis Network has been photographed in Dunhuang and Beijing, the Audi E-TRON truck, and charging high temperature and low temperature conditions. Calibration test part of the process. Previously, the new energy intelligence analysis network also worked deeply with the latest version of the QUATTRO electric four-wheel drive system’s overseas version of the Audi E-TRON 55 version.

New Energy Intelligence Analysis Network will be based on the status of Audi E-TRON 50 version of the commercial vehicle based on 400 volt voltage platform, and the recharging efficiency of 60 kW and 150 kW DC charging piles, respectively.

Domestic Audi E-TRON 50 Quattro (Audi E-Tron) is significantly different compared to import versions. Audi E-TRON is equipped with the three-dimensional lithium battery system provided by Ningde Times, with load power is 96.7 degrees (86.5 degrees of electricity), with energy density of 142 watts / kg, the pure battery under comprehensive conditions is 465 km (50) and 500 km (55). Through the power battery load, there are few different price models, which are favorable for the development of China’s market sales.

In August 2020, 7 kW (peak) AC charging test was performed in Dunhuang’s shooting in the high temperature environment of FAW Audi E-TRON. Relatively dry and high temperature Dunhuang is second only to Turpan’s best comprehensive test area.

In December 2020, a 60 kW (peak) DC charging test (State Grid) was taken in Beijing. In Beijing, the outdoor temperature is 5 degrees Celsius to 5 degrees Celsius, which is 396 volts, which is 396 volts, which is 400 volts.

1, Audi E-TRON National Power Grid 60 kW Flow Charge Test:

In May 202, the new energy intelligence analysis network Production version of Audi E-TronTake 60 kilowatt fluff charging test (the previous technical verification vehicle for low temperature DC charging test is performed). After 30 minutes of driving in the cockpit refrigeration mode, DC charging test was performed, and the surface maximum temperature was about 35 degrees Celsius.

The figure above shows the detail of each sub-system detail after the Audi E-TRON power cabin removal.

White Arrow: Whole-vehicle heat management system lysque

Red arrow: Electro-hydraulic integrated brake pump of integrated ABS valve body

Blue arrow : Liquid-cooled-heat-dissipating OBC (charger) integrated module (supporting 6 kW-9.9 kW)

Green arrow: front bridge electric drive control unit (“3 in 1” asynchronous induction motor assembly) [123 ] Yellow Arrow: 2 sets of PTC control modules (on the left side for high power cockpit, the right side is low power power battery)

Audi E-TRON’s vehicle-level thermal management system, Based on heat pump air conditioning technology, it is composed of a plurality of “X-through” valve body and electronic water pump.

In the winter, the lowest temperature is higher than -15 degrees Celsius, using hot air conditioners to distribute heat to the cockpit and power battery in the transfer process;

The lowest environment in winter The temperature is below -15 degrees Celsius, and the high power PTC control module is used to heat the coolant for the driving cabin, using a low-power PTC control module to perform a low-temperature preheating servo.

In the hot air conditioning system, the air conditioning system is provided to provide a cockpit refrigeration and power battery high temperature heat dissipation servo. In order to achieve power consumption, Audi E-TRON’s vehicle thermal management control system uses a combination of large circulation + small cycles and shared 1 set of cooled liquid pins. According to the ambient temperature, the cockpit temperature, the electric drive system temperature, the power battery charging power (current), and the cell (module) temperature, natural heat dissipation / cooling can be performed in a large circulation system; preheating in a large circulation system; A plurality of heat pipe control strategies such as active cooling or active preheating in a small cycle.

No matter the import version or want to be in the domestic version,The fast charge interface located on the Audi E-TRON passenger side, which is all in line with the Chinese standard. The 60 kW straight charging pile built by the national power grid is the most common and efficient charging facility in China. The Audi E-TRON charging test is performed in the National Net of 60 kW, which has a wide representation of the significance.

Based on the 150 kW DC charging facility for national standards, the active liquid cooling system is not set for the charging cable, but the cross-sectional wire and safety assistance is used. set. It should be noted that (3), the standardized 60 kW (including 120 kW) of the national grid construction can output information such as the most basic charging voltage, charging current, charging duration and power battery SOC value, while also display real-time electricity Core voltage and the most important real-time battery temperature. The 150 kW DC charging pile end of the test can only display information such as charging voltage, charging current, and charging power, but only does not display real-time battery temperature.

After charging 3 minutes 36 seconds, the Audi E-TRON power battery SOC value rose to 41%, the actual charging voltage is 409.7 volts, and the actual charging current is 238. An, charging power is 97.51 kW.

After charging 15 minutes and 29 seconds, the Audi E-TRON power battery SOC value rose to 41%, the actual charging voltage is 27.7 volts, the actual charging current is 237.5, charging The power is 101.46 kW.

After 50 seconds of charging, the Audi E-TRON power battery high temperature heat dissipation system is automatically activated. The temperature of the pipeline surface temperature from the associated radiator is reduced by thermally imaging. Based on the heat management system of the heat pump air conditioner, a high-temperature heat dissipation servo of a small cycle range (manifesting is started by the heat pump air conditioner compressor).

Domestic Audi E-TRON Power Battery is provided by Ningde Times, and the loading capacity is also increased to 96.7 degrees, and the reservation is 86.5 degrees. Electricity. This is in turnFor conservative loading / usage power ratio, with manually modified daily / long-distance charging strategy, you can maximize frequent faster charging battery cell consistency and the safety of high temperature / alpine environment.

The author has something to say:

Audi E-TRON is undoubtedly the EQC of Beijing Mercedes-Benz in the current luxury brand. Previously, the new energy intelligence analysis network was deeply analyzed for Beijing Mercedes-Benz EQC technology. The conclusion was that the power battery technology “is not so advanced”, and the charging efficiency is also “not so high.” The first rush is the 350 volt voltage platform of Beijing Mercedes-Benz EQC, with the gap between the 400 volt voltage platform of Audi Etron.

In the May 6th issue, “Car owners submitted: Beijing Mercedes-Benz EQC fast charge in the North Car owner” is less than 9 kW, “Beijing Mercedes-Benz EQC owner When the 60 kW charging station near Xi’an is found, the purchase of this Beijing Mercedes-Benz EQC DC fast charge is only 8.8 kilowatts, and is “disappeared” by the Beijing-Eu5 electric car owner.

Charging at the 60-kilowatt-powered charging pile of the State grid, showing Beijing Mercedes-Benz EQC power battery voltage of 357 volts, charging current is 52 kW, and the car shows charging The power is 8.8 kW. Mercedes-Benz and Audi with the “BBA” camp, there is a significant gap in the setting of the key power battery system.

The domestic Beijing Mercedes-Benz EQC and Audi E-Tron have been upgraded varying degrees. Audi E-TRON has reserved 400 volt voltage platform to increase the power battery loading. Obviously, at the same charge power, the higher the battery voltage platform, the less charge, the smaller the battery, the higher the safety of the whole vehicle. However, the higher the battery voltage platform, the requirements for other high-pressure electricity systems of the whole vehicle are also high, high manufacturing cost, higher reliability requirements.

As a traditional car manufacturing major, Audi and other car plants to treat new energy is consistent, stepped up the research and development of traditional vehicles, and vigorously add new energy vehicles and core technologies.In, at the same time, it will never use the radical and non-careful and brand health development routine. Instead, for word-of-mouth, preferring to choose a relatively conservative solution, have obtained full life cycle performance consistency and absolute vehicle safety.

Audi E-TRON is a large number of charging reliability and charging efficiency in different temperature environments across the country, which is the maintenance of the whole vehicle after mass production or even the prototype. Guarantee.

After the end of the launch, the “depth: the Audi E-TRON electric four-wheel drive system torque redistribution strategy”

The new energy intelligence analysis network evaluation group produced.

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