It is very simple to tell the reader that the two authors have studied the motorized motor control scheme optimized for three years. The first is a single motor dual voltage class and the second is a dual (multi) motor dual voltage class. Despite the differences in such designs, the design starting point is to prioritize energy optimization controls. Single motors are designed for lower cost, and multiple motors are designed for more efficient and superior performance. But the low voltage of both is 48V DC / 33V AC. The high voltages are 144V DC/99V AC and 520V DC/380V AC. What are the benefits of doing this?
1 The low voltage 48V battery pack is safe enough to allow the owner to change power on his own.
2 The low-voltage 48V battery pack has a variable on-board capacity, which can be 100-400 km of pure electric mileage. The high-voltage battery pack is fixed at 160 km of pure electric mileage. Power distribution on demand every trip.
3 High-voltage battery packs use high-power ratio batteries, brake feed energy recovery and instant release, and fast charge performance is better.
4 Dual voltage system is equivalent to dual power supply. When one of the high and low voltage battery packs is overloaded or the battery is faulty, immediately turn off the battery pack and the battery will not collapse. Vehicle travel is not affected.
5 When you need to replenish your trip, you can quickly charge and change the power. When the battery is exhausted, select fast charge, or change the 48V battery pack. Or high-voltage battery pack fast charge, 48V low-voltage change at the same time. Refill in the fastest 15 minutes. Close to the convenience of refueling.
The 6 48V low-voltage battery pack uses a smaller rate of charge and discharge, and the vehicle energy is mainly provided by low voltage. It is equivalent to improving battery pack conditions and extending battery life.
7 Usually, the high-voltage battery pack is fixed in the car, and the low-voltage battery pack is purchased by the owner. That is to say, the owner only needs to buy a battery with a 160-kilometer pure electric range. When traveling long distances, the owner rents a 48V low voltage battery pack. This reduces the cost of car purchases. Of course, the owner can also choose a 48V low-voltage battery pack with a power of 100 to 400 kilometers. The owner can choose the configuration as needed.
These 7 advantages, even if it is one of them, become a patent of a car company, can make car companies invincible in the future competition. And so many advantages are concentrated in the dual voltage system, is it difficult to achieve?
The dual voltage system is very easy to implement in terms of technical difficulty and cost of implementation.
For the 48V low voltage battery pack, the voltage range is shown in Figure 1.
Figure 1 48V system is a low voltage and safer system, according to regulations
Figure 2 The finger is directly shorted to the positive and negative terminals of the 48V battery pack, and no electric shock will occur.
The 48V battery pack is safe to use in parallel loading, and the battery is easy to maintain. It can directly touch the two ends of the +-electrode of the charged battery by hand, and there is no electric shock accident, which ensures the feasibility of manual manual power exchange.
In the 48V low-voltage system, the insulation requirements are much lower in the safe voltage range, and electrical accidents do not occur in electrical basics. When the vehicle is immersed in water, the 48V low-voltage system will not cause electric shock injury to the driver and passenger even if the battery pack enters the water. The electric system can still work in the turbid rainwater 48, even if it falls into the water, it will not drive. The electric shock was caused by the personnel and the electrical system of the vehicle was still working.
The current energy density of lithium battery cells reaches 330WH/KG. Equivalent to 1 kg 0.33 degrees. 30 kg is about 10 degrees. The battery pack is made into a tow bar box. Each battery box weighs 30 kilograms, and the four tow box 120KG has a total of 40 degrees. 100 kilometers of electricity consumption 10 to 20 degrees can last 400 to 200 kilometers, edamame 3 can last 300 kilometers (calculated according to 13.5 degrees / 100 kilometers). The on-board high-voltage battery pack (16 to 32 degrees) has 160 kilometers. Together, you can get more than 560 to 360 kilometers of battery life.
When the vehicle needs to run out of power, the 120KG trolley case 48V battery pack, the owner can change the power by no more than 6 minutes, and the 15-minute fast charge high-voltage battery pack can get more than 100 kilometers of cruising range. This way of replenishing is almost catching up.
More importantly, if the owner's mileage is only less than 100 kilometers per day, only two 48V30KG trolleys need to be taken home to charge. There is no need to charge the pile at all. It solves the problem of difficult charging, and only needs to rent more battery packs when it needs to be located at a long distance.
In the next article, we will discuss how to implement a single-motor dual-voltage system with a small car that can cost between 30,000 and 60,000 yuan.
These detailed designs were completed more than a year ago, when I personally thought that only the electric vehicles that brought biomass energy could achieve the energy revolution goal. Do not consider such a design as the most effective solution. Recently, for the purpose of free yourself. Write all the solutions that you can't quite determine. Of course the n motor dual voltage solution, if feasible. The design of the electric car was rewritten almost by one person. And I am not a professional electric car, although over the past three years, I have studied more than twice the knowledge points, textbooks and materials that I have studied in the four years of college. But many things, I just know that one or two are unknown, there are great limitations. Even, what I did was probably a low level of repetitive useless work.
I personally position myself as a media writer and rely on science and evidence for the content of the articles I write. Occasionally exaggerated, sensational.
I also invite readers to give corrections, many reasons, no distinction, welcome to argue, and make progress together.