Wuling Hongguang's new energy vehicle was dismantled before, and today another well-known organization dismantled BYD's new energy vehicle and shared it in detail.
Recently, Haitong Automobile Laboratory conducted detailed dismantling of BYD "Yuan", which means that the field of dismantling has expanded from mobile phones and computers to new energy vehicles. This is also the first time that Haitong Automobile Laboratory has "disassembled" electric vehicles.
It is reported that a total of more than a dozen researchers from the automotive team of Haitong International and Haitong Securities participated in the car teardown research, and it took two to three months before and after the research report was written.
Why choose to dismantle this model? Haitong International believes that this car is BYD's first mass-produced model based on the e-platform, which is a milestone.
It is reported that the vehicle dismantled by the Haitong Automobile Laboratory this time is the 2018 BYD Yuan EV360 , manufactured by BYD Auto Industry Co., Ltd., and the year of manufacture is September 2018. The model is Zhilian cool white model, and the maximum allowable total mass is 1870kg.
The total purchase cost of the car is 103,400 yuan, including the price of the vehicle itself after the subsidy in Beijing in August 2018 of 99,900 yuan, the vehicle insurance fee of 3,000 yuan and the registration fee of 500 yuan.
BYD Yuan EV360, as the first pure electric model of BYD e platform, is the first model in the history of BYD whose monthly sales exceeded 10,000. With a price of less than 100,000, after it was launched in May 2018, it won orders for 2018 units in the first month, and the cumulative sales in the first three months exceeded 10,000. In January 2019, the monthly sales exceeded 10,000 units, reaching 10,093 units, making it the first model in BYD's history to sell more than 10,000 units in a single month. As of April 2022, the cumulative sales of BYD Yuan EV models have exceeded 174,000 units.
Its overall body length is 4360mm, width 1785mm, height 1690mm, wheelbase 2535mm, front track 1525mm, rear track 1535mm. The body is made of steel. In the BYD Yuan series, 85% of the frame of the Yuan PLUS is made of high-strength steel. At present, the 150,000-class car is generally 60-70%. Among them, 55% are ultra-high-strength steels, and hot-formed steels with a tensile strength of 1500Mpa account for 11%.
Haitong International analyzed this BYD "Yuan" from the aspects of appearance, handling, safety, cost performance and battery life. Haitong Automobile Laboratory presents every component of this electric vehicle in detail in the report, including body structure, chassis, seat, wiring harness, multimedia system, instrument cluster, thermal management system, battery system, electric drive system, etc. .
A closer look at the battery system and electric drive system
The team believes that the battery life of BYD "Yuan" is 42 degrees at full charge, and it takes about 7 hours to fully charge with AC slow charging, and it takes 3 and a half hours from 25% to 80%. The charging power of DC fast charging is about 40kW, and 80% of the electricity can be fully charged in 0.5h. In summer, the air conditioner is fully air-conditioned, and in normal mode, it can run about 290KM, which is basically in line with the official battery life. This car saves electricity in summer, but it consumes a lot of electricity in winter. If the air conditioner is not turned on in winter, the windows will be foggy, which will affect the sight. But once the air conditioner is turned on, the battery will drop. The impact on battery life is more obvious.
Let's take a closer look at BYD's "Yuan" battery system and electric drive system.
Battery system - battery pack
The Yuan EV battery uses an independent aluminum tray and is installed under the chassis. The battery uses a ternary lithium-ion battery with a capacity of 43.2kWh and a battery pack with an energy density of 127Wh/kg, all of which are self-made by BYD.
Battery system - The interior of the battery pack is protected by an asbestos heat insulation pad.
The total battery pack of Yuan EV360 is 43.2kWh, which consists of 11 series battery modules, of which 6 modules are connected in series with 10 cells, and 5 modules are connected in series with 8 cells, that is, the battery pack consists of a total of 100 cells Composed in series.
Battery system-cells, modules
The battery pack uses a ternary lithium-ion battery with a single battery of 120Ah and a rated voltage of 3.6V. Single cell size parameter: 173*122.5*50mm.
Battery System-BMS CECU
The BMS of the battery pack adopts a distributed architecture, including a central controller (CECU, outside the battery pack) and three local controllers (LECU, inside the battery pack), among which the CECU uses Freescale MC9S12XET256MAA (HCS12 series), its main function It is to implement monitoring battery status (SOC, temperature, SOH, etc.).
Battery System-BMS CECU
The battery pack includes 3 LECUs, corresponding to the sampling data of 11 battery modules.
The main function of LECU is to collect the primary status information in the battery module, mainly the voltage of each series battery cell and the two temperature data in the module measured by the temperature sensor. The data acquisition IC chip used is Maxim's MAX17823B.
electric drive system
Yuan EV adopts a three-in-one electric drive assembly, that is, an integrated solution of motor, reducer and controller. The core components of the electric drive assembly are all made by BYD.
Electric drive system-motor, reducer
The motor adopts a single motor scheme, which is a permanent magnet synchronous motor with a peak power of 70kW and a rated power of 35kW.
The motor controller adopts TI's DSP (Digital Signal Processor) chip TMS320 and Lattice's CPLD (Complex Programmable Logic Device) chip LAMXO256C.
Small three electric module
Yuan EV adopts a three-in-one small three-electric integration solution, that is, the on-board charger (OBC), DC-DC, and PDU are integrated in one module.
The charging interface is located at the front of the vehicle, and is divided into a 6.6kW slow charging interface and a 60kW fast charging interface, supporting 7 hours of slow charging or 0.5 hours of fast charging (up to 80% SOC).
Start-stop battery
Yuan EV's 12V low-voltage system still uses lead-acid batteries, which are Tianneng's 38B20L, which mainly supplies power for the low-voltage system and can be charged by the high-voltage system through DC-DC.
thermal management system
The thermal management system of this vehicle adopts the traditional air-conditioning refrigeration + PTC heating method. The thermal management system generally includes the air-conditioning refrigeration system, PTC heating system, coolant/refrigerant pipeline and control panel.
Air Conditioning and Refrigeration System
A typical air conditioning and refrigeration system includes core components such as electric compressors, electronic expansion valves, and condensers/evaporators. The compressor is the "heart" of the air conditioning system. Its function is to suck and compress the low-temperature and low-pressure gaseous refrigerant from the low-pressure side to increase its temperature and pressure, and then pump it into the high-pressure side to become a high-temperature and high-pressure gaseous refrigerant. The reciprocating cycle is the connection The key to the low-pressure and high-pressure sides of the air conditioning circuit.
The manufacturer is from BYD Industry, and the value of the bicycle is 1500-2000 yuan.
The expansion valve, also known as the throttle valve, is a key component in the air conditioning system. It is placed between the condenser and the evaporator in the basic circuit of the air conditioner. Steam form), while controlling the flow rate of the refrigerant is not too high or too low. Opposite to the compressor, the expansion valve is the key to connect the high pressure side and the low pressure side of the air conditioning circuit.
The air conditioner radiator assembly (front cooling module) is placed at the front of the car, including the condenser under the refrigerant circuit, the radiator under the coolant circuit and the electronic fan.
The condenser is a part in the air conditioning circuit that exchanges heat with the outside.
The radiator is the part in the coolant circuit that exchanges heat with the outside.
The role of the electronic fan is to accelerate the air circulation rate of the radiator module, thereby improving the efficiency of heat exchange.
The air conditioning box assembly (HVAC) is the in-vehicle module of the refrigeration and air conditioning. Its main components include the evaporator, blower and controller, and cooperate with the external air outlet to supply air to the cabin.
Battery thermal management system
The thermal management system of the battery needs to realize the two functions of heating and cooling the battery pack. The heat exchange with the battery is mainly realized by the water cooling plate in the battery box, and the main transfer station for the energy of the battery pack to transfer to the outside world is the battery cooler. (Chiller), which combines the functions of an evaporator and a heat exchanger.
Plumbing PTC heating system
This model adopts the PTC heating method, which uses the PTC thermistor element as the heat source, which is essentially the common current heating effect.
The heat transfer mode is water heating, that is, the coolant pipeline is used to cooperate with the blower to heat the cabin, and the pipeline is shared with the coolant cooling mode in the battery heating circuit.
multimedia system
Yuan's multimedia system includes two parts: the central control host and the car screen, of which the screen is an 8-inch LCD screen; the entire system is independently developed and designed by BYD.
After the multimedia system is disassembled, it includes two major PCB boards:
1) 8-inch screen rear PCB board;
2) There are two layers of PCB inside the host.
The PCB behind the 8-inch screen includes two parts: the driver board of the car screen, and the button board corresponding to the buttons under the car screen.
The PCB board in the host includes:
1) Upper board: core chips include NXP i.MX6, Sandisk e.MMC, NANYA DRAM and ADI video decoding chips, etc.;
2) Lower board: It is the main board of the car, including the multimedia radio module and so on.
The core chips in the instrument cluster controller include: NXP MCU, ISSI SDRAM, MXIC Nor Flash, etc.
lamps
There are two BYD headlights, each with a length, width, and height of 70*30*20cm, and a total weight of 4. 25KG. According to the quotation of parts dealers, the value of a single headlight is about 1,200 yuan.
There are 2 BYD taillights in total, the length, width and height of each are 47*20*12cm, and the total weight of each is 1. 2KG. According to the quotation of parts dealers, the value of a single taillight is about 450 yuan.
There are 2 BYD fog lamps, the length, width and height of each are 30*20*12cm, and the total weight of each is 0. 35KG. According to the quotation of parts dealers, the value of a single fog lamp is about 100 yuan.
at last
Yao Shuqiao, an analyst at Haitong International Automobile Co., Ltd., was quoted as saying, "This kind of practice is relatively rare in China, but from a global perspective, dismantling can provide a deeper understanding of the entire automotive product and related industry chains. BYD represents The epitome of the upgrading and transformation of China's manufacturing industry, this "Yuan" in 2018 is far from comparable to today's BYD cars in terms of aesthetics and intelligence, but we can dismantle this model to help you get a first look. Investors in the industry have a more intuitive feeling."
This "car teardown" report also aroused enthusiastic feedback from the market. "Actually, the market's reaction was a little bit beyond my expectations. The more we dismantle it, the more we can feel that China's new energy automobile industry has indeed made great progress." Yao Shuqiao said.
How about BYD's new energy vehicles? For those who have driven it, please comment in the comment area!
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