April 19, 2021 Shanghai Auto Show, BYD released Tang DM-I, new X Dream and EA1 two concept cars unveiled. At the same time, BYD officially announced the “8-in-one” electric drive system and the latest integrated heat management system based on the E platform 3.0 architecture and subsidiary of 800 volt voltage.
As the next generation of BYD, the E platform 3.0, all high-pressure electricity systems (electric drive, electric control and battery) using 800 volts, and low voltage electrical systems The 4 sets of domain control systems interact with the vehicle level through the BYD OS operating system developed.
Previously, the new energy intelligence analysis network was released earlier in January 2021 “depth: pre-judging 1 + 2 group flat line electric drive system BYD Han gt Technical Status “One Text, Analysis of Electric Drive Technology Status of Han GT in” Legend “. In order to reach 0-100km acceleration 2.9 seconds, the output power of the Han GT’s electric drive system is bound to enhance and improve heat dissipation efficiency. However, all of the expectations are based on the technical status of BYD models, electric drive and power batteries that have mastered before December 2020.
The picture above is the video Differently written in the background display of the E platform 3.0 in kind. The appearance of the concept car (referred to as the red arrow) named e-seed GT seems to indicate that many new technologies that e-platform 3.0 will become a standardized vehicle carrier for high-end models in the future.
E platform 3.0 Electronic Electrical Architecture Technology Analysis:
Like the E platform, the E platform 2.0, the E platform 3.0 is driven by the front electrical drive system, the center power battery system and the rear electric drive System constructing, supplemented by electric drive control, battery control, cockpit air conditioning system, battery thermal management system, low voltage electrical system.
Doubt, e platform 3.0 technology architecture is no longer simple to be a model platform, but a set of precision running systems through processor (hardware) – operating system (software) – rehabilitation (software) The mode has created a new model for the continuous improvement of the full life cycle performance of electric vehicles.
Of course, the E platform 3.0 technology architecture is supported by the high and low voltage electrical system (hardware) and the BYD OS operating system (software), the owned person-car interaction, Car-car interaction, car-objects, the underlying logic of the car, which can be compatible with a more abundant modular function package provided by the third party, and realizes the implementation of unmanned driving functions such as different levels.
The above figure shows the “8-in-1” electric drive (red arrow) / electronically controlled (yellow arrow) system assembly in the E platform 3.0 architecture, based on the heat pump Integrated thermal management system (white arrow) of electric air conditioner compressor (blue arrow), and related pipeline technical state. 
The voltage platform is increased to 800 volts by the official comparison of the E platform 3.0 electronic electrical architecture, the voltage platform is increased to 800 volts, and the integration is higher. Super Electricity Four Power), integrated thermal management technology, which constitutes high performance low-energy hardware foundation, 4 sets of domain controllers and self-developed OS operating systems constitutes control and upgrade software systems, are for continuing Reduce power consumption, increase charging power, reduce current and heat, and have better security at the same time to obtain 0-100km acceleration to 2.9 seconds.
1, the 800 volt voltage platform in the E platform 3.0:
2016 – 2019, BYD is used to use the three-yuan lithium battery system for Qin Ev and Qin Pro EV series.High-end models such as PRO EV and Tang EV. This period is subject to the national subsidy 0, and the energy density of the ternary lithium battery is climbed year by year, and the battery and charging efficiency increases at the same time. Since the ternary lithium battery itself is weak in the safety characteristics of the lithium iron phosphate battery, BYD has increased to a variety of EV models to 500-600 volts.
The Tang EV voltage platform adapted to three yuan lithium battery system is set to 613.2 volts. Use “boost” technology in the E platform system, which can achieve up to 82 At the same time of the charging power of the kW, the current is still around 110 or so, and the heat generated by the “3 in 1” high-voltage electricity system involved is small.
2020 daily EV, a better blade battery system and the voltage platform are set at 569.6 volts. Based on the E platform 2.0 architecture, the charging power of the Han EV can be easily broken through 120 kW, and the current is maintained at a “lower” state, and the heat generated by the “2-in 1” high-pressure electricity system is small.
The e-platform 3.0 in 2021 fully uses the 800 volt voltage platform, first meant to obtain a safe and maximum charging power (150 kW) without configuring the DC charging pile of the liquid cooling system. Or higher) and shorter charging cycles.
The 800 volt voltage platform used by the E platform 3.0 can drive 150 kilometers of fast charge settings for 5 minutes, but after many years of different models (from 400 Verification of volts, 500 volts, 600 volt voltage platforms, repeated “iteration” development. The introduction of the 800 volt voltage platform of the E platform 3.0 also verifies the high performance and reliability of other high voltage electrical systems.
2, “8-in 1” electric drive / electric control assembly in the E platform 3.0:
Perhaps this “8-in-one 1” electric drive / electric control assembly, which reduces costs in separate sales, and can be compatible with 400 -800 volt voltage platform. “8-in-1” electric drive / electrical control assembly under the E platform 3.0, based on the maximum speed of the electric drive portion of the flat line winding technology exceeds 17,000 rpm, oil cooling, the maximum output power is over 200 kilowatts; The electronics of SIC technology will integrate control of multi-functional inversion, boost, charging, insurance, etc. Most importantly, the “8-in-one 1” electric drive / electric control assembly can be composed of the paving pavement to the full-time super electricity four-wheel drive system for complex road conditions, giving the whole vehicle wider market competitiveness.
3, domain control strategy and BYD OS operating system:
The domain control strategy is not a new concept, but there is a small number of new energy vehicles using this new technology. . The biggest difficulty must be an EV or PHEV model based on the “Model Traction” mode. From the beginning of the design, the whole car function system is classified according to different division methods, and the vehicle level is controlled by the data channel with the domain controller and the central processor at the operating system.
The left structure diagram shows the early traditional vehicle division system distribution, and the function controller is connected or executed by simple low-voltage cable;
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The right structure diagram is the latest system distribution system distribution of the domain control strategy, CPU passes The operating system issues an instruction, transferred to the graphics card, hard disk, sound card, and network card via the motherboard, where the network card, sound card, hard disk, and graphics card can be seen to do 4 sets of domain control modules, independently responsible for the relevant system under the CPU;
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Under the E platform 3.0 architecture, a total of 4 sets of domain control systems are set, respectively, the intelligent domain control system, the left car body control system, the right car identification system, and the power domain control system. . It is certain that the 4 sets of domain control systems subdivided under the E platform 3.0 architecture, comprehensively cover high-voltage electricity systems and low voltage power systems, and electric drive systems, electrical control systems, power batteries, heat management systems, intelligence Driving system and smart cockpit system for vehicle level control. 
In view of BYD to continuous development and accumulation of Android-based Dilink vehicle interaction systems from the E platform era, “iteration” is developed to the E platform 3.0 configuration independent development The BYD OS operating system will provide stronger compatibility for the unmanned driving era of data transmission demand, providing better scalability for third-party development function APPs, and ensuring that the car has a brake priority and absolute Safety.
4, the integrated thermal management system based on heat pump air conditioning is required:
BYD is the first thermal management system equipped with a three-yuan lithium battery (based on coolant) Chinese manufacturers of low temperature preheating and high temperature heat dissipation. In a considerable period of time, the electric vehicle-based electric vehicles manufactured by other vendors are in a mode of passive wind cooling and electric heating. However, the energy density increases, and the three-dimensional lithium battery that is declining security is not configured to be eliminated by the mainstream market in 2019.
BYD, from the process of phosphate, three-dimensional lithium battery-blade battery, according to the type of power battery, energy density, and charging power have developed a variety of thermal management control strategies and loaded . 
2018 Qin EV450 adapted to 3 sets of liquid circulation lines, 2 groups of PTC, multiple groups “3 pass” valve body, ensure high temperature cooling requirements of electric drive system, cockpit Warm and air conditioning refrigeration requirements and power battery high temperature heat dissipation and low temperature preheating requirements. The three sets of circulatory systems that were approved by Qin Ev450 and Song EV500 electric vehicles on this period were filled with universal coolant.
2020 daily produced Han EV adapted 2 sets of liquid circulation lines, 1 set of PTC, multiple groups “4 pass” valve body, to ensure electric drive System high temperature heat dissipation requirements, cockpit heating and air conditioning refrigeration and power battery high temperature heat dissipation and low temperature preheating requirements. In order to ensure the auxiliary safety of the blade battery, the low conductivity coolant is filled.
Tang DM-I adaptation 2 sets of liquid circulation pipes for engine – dual motor heat dissipation and dual motor control system heat dissipation, remove PTC and water-cooled plates, etc., based on coolant-based power battery thermal management systems, and use efficiency and more preferential direct cooling technology. The refrigerant that the electric compressor leads to the electric compressor will carry the refrigerant of the refrigerant in the blade battery housing by the hard tube to heat dissipation inside the blade battery housing.
Perhaps the integrated thermal management system will further improve after the car, and the hydraulic pot is used for secondary expansion integration, effective The heat is introduced from the electric drive cycle line to the cockpit or power battery in a more powerful winter winter; or the driving cabin is heated to cool the blade battery to the blade battery by the PTC.
[123From the configuration, the BC-based heat pump air conditioning integrated thermal management system based on the E platform 3.0 is first reduced, not only around the cockpit and power cells, not only for coldness and heat. Interaction, but in the domain control level, the heat is controlled by the BYD OS operating system, and the cold amount is directly sent to the blade battery and the cockpit, and the heat is delivered from the electric drive system, the cockpit, and the blade battery.
Review the past 2 generation E platform technology upgrade, electric drive system integration, heat management control system evolutionary \ Simplified process, basically confirmed the latest E platform 3.0 Electronic electrical architecture is performance to do addition, in structure, reduce energy consumption, while prioritizing the “iterative” development strategy for security.
Undepended Continued
New Energy Intelligence Analysis Network Evaluation Group