In the past twenty years since entering the lithium battery era, it has always been lithium batteries. For example, cell phones are primarily made of lithium batteries. Currently, lithium has the lowest potential among metals. Using lithium as a negative electrode produces a higher voltage. In many other areas, lead-acid batteries are still commonly used. For cost reasons, it will take time for them to popularize lithium batteries.
In fact, the progress in the field of batteries is not small, but there is no substantial progress in this area yet. Everyone knows that lithium batteries have high energy density, and the energy per unit weight of lithium batteries is five times that of lead-acid batteries. In addition, lithium is not a heavy metal, it hardly pollutes the environment, it islightweight and has a long lifespan, unmatched by other batteries.
So far, no battery has been found more suitable for use over large areas than lithium batteries. Over the years, scientists have only been able to continually improve lithium battery designs and slowly improve battery efficiency by replacing electrolytes or cathode materials. According to statistics, the annual progress can be around 3%.
An improvement of 3% per year should not be small after many years, but in comparison, electronic products are updated faster, but chips improve faster and the increase of power cannot keep up with the power consumption of new products. Thus, advances in battery technology are easily wiped out. It can be said that until there is no better technology capable of replacing thes lithium batteries, we can only slowly develop battery technology through improvements.
It will cost 140,000 yuan to repair a Tesla damaged by a stone. Authorities say the price is clearly stated. Do you think this amount is reasonable?
It's very reasonable. I already mentioned this in my previous answer. It seems that using the tram saves money, but in fact there are many pitfalls behind this. If you're not careful, you'll spit. all the money you saved.
At that time, some street car enthusiasts argued with me about the battery manufacturer's "lifetime warranty". I don't know if they were really naive or just pretending to be confused;
There were also many people who popularized the science about "charge". "Number of cycles", if I hadn't started playing with batteriess lithium 20 years ago, I would have believed it;
I did it. I talked about the shortcomings of electric cars on Zhihu, but in the end I was labeled as a gasoline car. There are also those who go to the extreme and classify me as a class enemy who “opposes national policies”. not at all for the builder to hit these people with his iron fist.
Here I would like to know more about lithium batteries, especially the cylindrical lithium batteries used by Tesla. This type of cylindrical battery is actually not new. It was invented 30 years ago and the first size was 18650. Why am I so impressed with this type of battery? This is because I bought a second-hand IBM laptop 20 years ago, the battery was out of order, resulting in empty power, which could go directly from 90%. at 10%. I took the battery apart and took a look. It contained 18650 batteries connected inseems. I replaced them manually and fixed the battery life issue. I've been using it for about 2 years and the problem is the same as before.
The battery of Tesla cars is actually exactly the same as the principle of the battery of IBM laptops 20 years ago. A large number of cylindrical batteries are connected together for charging and discharging . Don't fall into the electricians' trap and think that today's battery technology has advanced so much. I can say that Tesla batteries will have the same problems as IBM laptop batteries. After all, no matter how developed the BMS is, it cannot guarantee that the quality of each battery cell is “uniform”. be resolved by software.
As this is a physical problem, it is actually very simple and crude to solve. Simply replace the problematic battery. Then here comes the humiditytee in the middle. Tesla's battery is made up of thousands of cylindrical batteries. As a consumer, there is no way to determine which batteries have problems. All interpretation rights belong to the manufacturer. In other words, if the manufacturer says the battery is broken, it's as many cells as they say. If the whole battery is broken, you cannot check it one by one. Do you have the tools? Do you have software? Replacing a few cells may only cost a few hundred yuan (including labor), while replacing an entire battery may cost tens of thousands or even tens of thousands. Do you believe in the manufacturer's moral standards or their desire for profit? I'm betting on the manufacturers' desire for profit. Because Tesla achieved such a trick in the latest 4680 battery:
You can see that the cells are filled with filler material rouge, which means that the cells can be dismantled separately and integrated into one. completely eliminates the possibility of replacing batteries on your own (unofficial repair shops), forcing consumers to go to the manufacturer for repair. Whether you like it or not, you will become a fish to be slaughtered on the manufacturer's cutting board.
Some people will definitely say that I can just choose a domestically made product with a "lifetime warranty" on the battery - that's really too young and too simple. It is better to believe in the national conscience than to believe in the iron fist of the law. Not to mention some strict conditions that a lifetime warranty must meet, such as only covering used cars, covering only normal use, only covering vehicles repaired in the 4S workshop, etc. Even if the car is replaced. when it has fallen below 80%, it isalso a huge pitfall.
First of all, how to define this 80% is entirely up to the manufacturer, because you don't have the tools and testing software to detect actual battery degradation. You can only “estimate” it based on your ability. daily mileage. But the manufacturer will probably tell you first that there must be a problem with your driving style or the weather, and they will send you away first. There's really no other way. Do you think the entire battery needs to be replaced? In fact, the problem is to replace the faulty battery core, which actually doesn't cost very much.
Regarding the so-called “life cycle” of electric fans, it is said that there will be no problem even if a tram runs until it is scrapped. It's nice to fool novices, but it's true. It's really a bit difficult to cheat on friends too. The so-called cyclic lifespan est an ideal state. To achieve this condition, we must first ensure the quality of battery cells, and also ensure that the quality of all battery cells is uniform. Which hair dryer has the ability to prove that the quality of thousands of battery cells like Tesla's can be uniform. and consistent throughout the life cycle? In fact, inconsistencies are a high probability event. Anyone who understands cars if you read it you will know that there aren't many streetcars that have been in use for less than a few years that have problems. As for the “physical life” of the battery, hair dryers rarely talk about it. Because lithium batteries are not used for a long time, or there are problems (such as voltage) during charging and discharging, it is easy to reach the physical life before reach the lifespan - according to my experienceThis, the lifespan of the 18650 battery will generally not exceed 5 years.
In fact, there are many more people who drive two-wheel streetcars who understand batteries than there are who drive four-wheel streetcars. Because the DIY two-wheeled tram has a high level of participation. Two-wheel electric car batteries are actually a smaller version of four-wheel car batteries. Anyone who plays with two-wheeled electric car batteries knows that the so-called number of charge and discharge cycles of a battery is just a cloud. -driven, and the consistency of the battery core is the core. Therefore, many two-wheeled tram riders who use DIY batteries will install monitoring applications on their mobile phones to monitor the battery status in real time. Why don't four-wheeler manufacturers create an appsimilar surveillance? It's not that difficult. The key is that the secrets have been read by consumers, so how can they be harvested? Please taste it carefully