"Understood, that is to say, if you want good climbing performance and starting performance, lead-acid batteries with better high-power instantaneous discharge are actually a better choice, right?"

"That's right," Andre had a hairy temper, he was straight to everything, he never knew how to be tactful, and even dared to directly explain the inappropriateness in Lin Zheng's words, "And the energy density is two units, the volume energy density of lead-acid batteries is larger than that of nickel-chromium, nickel-metal hydride and even lithium-ion batteries, and nickel-chromium, nickel-metal hydride and lithium-ion batteries are only greater in mass energy density than lead-acid batteries." ”

What else is that? Lin Zheng listened to the great wonder!

He has always thought that lithium batteries and even nickel-chromium, nickel-metal hydride batteries are more traditional lead-acid batteries in terms of performance, but he did not expect that lead-acid batteries are not only solid, but also will not produce sparks when discharging at a large current in an instant, and will not catch fire when hit, there is such an advantage: the so-called lead-acid battery has an advantage in volume energy density, which naturally refers to the same volume, lead-acid batteries can store more electrical energy, and the quality energy density advantage naturally refers to the same weight. Lead-acid batteries store weaker electrical energy than lithium-ion batteries and nickel-chromium and nickel-metal hydride batteries.

Well, that is to say, the energy storage weight ratio of the new energy storage device represented by lithium-ion batteries, nickel-chromium and nickel-metal hydride batteries is better, but lead-acid batteries are not without advantages at all, in the case of the same energy storage, lead-acid batteries can be made smaller, and the volume of the smartcity itself is very limited, and it seems that maintenance-free gel batteries are more suitable.

Of course, lithium batteries, nickel-chromium and nickel-metal hydride batteries are relatively squeamish, and he naturally knows that mobile phone batteries explode when they see water, otherwise why are submarines still using old lead-acid batteries.

But Boss Lin also has his own concerns, "How much higher is the price of this maintenance-free gel battery than the traditional lead-acid battery?" How much lower than NiMH batteries? Well, doesn't it mean that lead-acid batteries are more polluted? ”

"Fart pollution!" Andre sneered, but it's understandable, can a hairy bear who doesn't speak foul language be called a hairy bear? "In general, a car needs to replace the battery once every 2 to 3 years. The number of cars produced in the United States is about 2ooo per year, and the number of scrapped cars is also roughly at this number, which is equivalent to 3ooo million old lead-acid batteries are withdrawn from the market every year in the United States. There are 3ooo million new batteries on the market, how can no one say pollution in such a large quantity? How many batteries do we use? ”

"Those damn environmental groups chirping crooked? Okay, let's just say that our batteries use the same treatment scheme as the major car manufacturers...... Who would be stupid to throw away the old batteries, they are all recycled. ”

Even Lin Zheng has to admit that this is really reasonable, that's right, how many batteries does buddy use in a year? What percentage of the battery usage in the United States? But then, he thought of a new question, "But the voltage of the gel battery can't be very small, right?" I remember that the NiMH battery pack of the Toyota Prius is 288V, 6A? If we use gel batteries, it is almost 48V, 4OA, right? If you want to drive a permanent magnet motor with more than 4o horsepower, you need at least 1oov of voltage, right? ”

Someone said. This is not a problem at all, is it difficult for you to become a voltage above 1oov at 48V? It's not that difficult, of course, but the problem lies in a very strict problem: instantaneous discharge!

Yes, instantaneous discharge. When the motor just started to run, this is the most fuel-consuming reason when the car starts to add, after the inverter, the current of the battery goes up, but the voltage can't go up, there is no way to release too much current instantly, and there is no way to do the job of instantaneous discharge. So what to do? The only way is to get a motor that can work well at 48V low voltage.

Speaking of this question, Andrei smiled, "Boss, this is the second question I am going to talk to you. ”

"Huh?" Lin Zheng was stunned for a moment and nodded, "You say." ”

"The weight of your smartcity is only about 9oo kilograms, I did the math. If you use a gel battery, because the cooling system is omitted and the weight of the battery protection system is greatly reduced, the weight of the entire battery system is actually about 2o% heavier than the nickel-metal hydride battery pack, so that the weight of the whole car will not exceed 11oo kg. Such a light car, we don't need such a high power and torque motor at all, a 1o kilowatt, the only trouble is that the fuel-saving effect of the whole system may be a little worse, during the operation of the entire electric system, the motor is non-stop, but in the starting and adding stage of the car, the motor can assist the motor to add, and finally achieve the purpose of fuel saving. ”

Lin Zheng reacted instantly: This is not ...... The so-called "light mix" in later generations!

What is the fuel-saving effect of mild mixing? To tell the truth, it's still very good, Lin Zheng drove the Buick LaCrosse hybrid version for a while, this is a hybrid car equipped with a set of "light hybrid" system, compared with the traditional power, urban fuel consumption in more than 13 Regal, equipped with this set of "light hybrid" system LaCrosse can do urban fuel consumption 7 to 8, this is very remarkable, although the traditional power and mild hybrid LaCrosse are not much different when running high, but the problem is that no matter what kind of car, running high is not fuel-efficient, serious everyone still uses more cars in the city.

"1o kilowatts, at least 12 kilowatts," Lin Zheng said after a deep sigh, "If you can meet this requirement, you can consider it." ”

One of the characteristics of the electric motor that cannot be compared with any other prime mover is that it can achieve the maximum torque when it is o degrees, that is, the maximum torque is output when it is about to start but does not start, so that the motor avoids the best starting and adding phases, and the fuel consumption is naturally reduced.

"12 kilowatts,?" Andre frowned and thought for a while, but still nodded, "It's a little difficult, but we can do it." ”

"With such a system, how much can the cost be controlled?" Lin Zheng looked at Andre with blazing eyes, he knew very well that a domestic manufacturer in later generations could make this mild hybrid system cost no higher than 5ooo, that was in 2o13, even now, the domestic scientific and technological level is relatively poor, then there should not be more than double the gap, and people still use lithium iron phosphate, which is a more expensive battery pack.

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