How did the Cheng engine beat the lithium-sulfur solid-state battery

The 46th and 47th pages of the “Inverter World” published on August 15, 2018 are titled “A Hybrid Vehicle Structure Principle that Changes the Current Energy Structure”, and on September 15, 2018, the National Development and Reform Commission’s academic journal “China Strategic Emerging The lightyear hybrid vehicle structure introduced in “Industry”.

The 46th and 47th pages of the “Inverter World” published on August 15, 2018 are titled “A Hybrid Vehicle Structure Principle that Changes the Current Energy Structure”, and on September 15, 2018, the National Development and Reform Commission’s academic journal “China Strategic Emerging The lightyear hybrid vehicle structure introduced in “Industry”.

Figure 1. The structure of the dual-motor lightyear hybrid vehicle

In the Lightyear hybrid vehicle, the dual-motor is overpowered without an extended-range engine in the front cabin. With the performance of a sports car.

In the Lightyear hybrid vehicle, with an extended range engine placed in the front cabin, the energy density of the range engine has a performance that surpasses that of lithium-sulfur solid-state batteries. The technologies to achieve these advantages are mature.

The following is an improved version of GAC Trumpchi GS4 PHEV, GS4 LYEV, to illustrate how to achieve these advantages.

First of all, the data we inquired from the car home is as follows.

Table 1. Comparison of the main parameters under the three configurations, the use of larger or smaller parameters is the estimated value

GS4 LYEV is to install a 22KW generator motor on the front axle under the condition of GS4 PHEV unloading the fuel engine, generator and its accessories. This is a DC brushless motor. Driven by external forces, the DC brushless motor becomes a DC generator. The generated power is directly connected to the DC busbar of the inverter of the rear drive motor to drive the rear wheels. When the power is surplus, the inverter charges the battery in reverse.

It is found from the comparison of the above table. Under the current technical conditions, the lightyear structure is superior to that of fuel vehicles and has the technical requirements for popularizing electric vehicles.

Why does the energy density of the long-range engine system have surpassed that of lithium-sulfur solid-state batteries.

Here choose two specifications of the engine, respectively 20KWe and 7KWe.

Figure 2. BMW i3 extended range engine is modified from motorcycle

The 20KWe engine uses BMW I3 range extender. The weight of the Zengcheng system cannot be queried. According to relevant data, the total weight of 20KWe engine, 35L92# gasoline, and liquid cooling system without generators will not exceed 150kg. (Estimated based on the total weight of the motorcycle)

The energy density of 35L 92# gasoline is about 12kwh/kg. The theoretical specific capacity and theoretical specific energy of the lithium-sulfur solid-state battery are 1.672kwh/kg and 2.6kwh/kg, respectively. The maximum energy density after making the battery will not reach 40% of the theoretical value. Therefore, the energy density of the extended range generator system is 35L gasoline*12kwh/kg÷150kg*0.3 efficiency=0.84kwh/kg. Nearly the most efficient lithium-sulfur solid-state battery 1.04kwh/kg.

If the extended-range power generation is changed to 7KWe. With direct air cooling, the entire extended range system will not exceed 100kg. The energy density of the extended range system is 1.26kwh/kg. Far better than the best lithium-sulfur solid-state batteries.

The benefits of such an energy-density extended range system are not just long battery life. Utilizing the convenience of the existing gas station, the problem of difficulty in charging is solved. Obviously, the more important point is that lightyear uses existing mature technology. The lithium-sulfur solid-state battery has not been developed until the year of the monkey.

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