In May 22, Roewe released the latest R mark, which opened the era of R mark and "New Lion Mark". Among them, the R mark is positioned as "high-end new energy sequence", and ER6 is a product with the R mark. In addition, ER6 also has many bright spots in the three-electricity technology, which are worth explaining in detail.
The so-called "Three Electricity" is the abbreviation of motor, battery and electronic control system, and it is the key to the daily use of electric vehicles. This paper will focus on the introduction of the extraordinary ER6' s Sandian, and see how it can achieve NEDC's maximum battery life of 62km and maximum power of 184 horsepower through operation.
ER6 uses a coaxial motor instead of a common parallel-axis motor. The new motor is smaller in size. Compared with the four-layer Hair-pin winding motor, the range of motor efficiency ≥9% is increased from 83% to 88%. Compared with the four-layer Hair-pin winding motor, the average power consumption of the NEDC condition of ER6 is 13.8 kWh. In addition, the motor speed is increased from 12rpm to 15rpm, so that the scale can better take into account the torque at low speed and the energy consumption performance at high speed.
Coaxial motor is to put the output shaft, the half shaft and the motor shaft on the same axis, make the motor output shaft hollow, and at the same time nest a bearing in it, and then put a thin shaft in this bearing, so that the hollow shaft outside and the solid shaft inside rotate independently and do not interfere with each other, thus achieving the purpose of reducing the size.
in addition, the inverter at the top of the motor saves three-way connecting wires, which is flatter in shape than the previous products, thus saving some space.
in terms of battery, the extraordinary ER6 adopts NCM523 battery cell, the bottom frame is an integrated cast aluminum tray, and the fire cover is composed of silica gel composite material and glass fiber material, which is technically mature.
In addition, the battery pack adopts the large module battery scheme, which can make full use of space and improve the energy density of the battery compared with the small module.
compared with the layout style of electric vehicles in the past, the ER6 system adopts a customized large module scheme in which multiple standard modules are scattered and integrated, and each module has 16 batteries, which greatly reduces the number of parts and the space required for safe connection of parts, and further improves the integration efficiency. The final result is that the number of parts is reduced by 22%, and the saved space is used to lay out the battery cells. Finally, the energy density of the battery reaches 18Wh/kg. ?
In the aspect of electronic control, the battery case is designed with explosion-proof valve and balance valve, which can reduce the hazard rate by adjusting the battery state in time.
Extraordinary ER6 can also monitor the thermal runaway in real time through BMS battery management system. Once it is detected that thermal runaway may occur, the battery water pump is operated at full speed, and with the help of heat conducting materials, the excessive heat near the thermal runaway cells is quickly transferred to other positions in the battery pack, and the heat capacity equivalent to four additional cells is provided, which greatly reduces the probability of thermal runaway.
written at the end: electric vehicles have been cultivated in China automobile market for many years, and now the related technologies such as batteries have also made some progress. Judging from the information obtained so far, the cruising range and dynamic performance of the ER6 have a good performance.
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