Why is electric cars taboo too much?

　　Author ：Iflowpower – Portable Power Station Supplier

In fact, it is aimed at "overcharge", and new energy car companies have made corresponding charging strategy settings, such as restricting charging power, reservation time, etc., try to prevent battery overfilling is one of these functions. 1 lithium-ion battery taboo filled with the same new iPhone announced the same, does not support 5G iPhone11 series, also set off a wave after the announcement; eating melon people is mixed with the iPhone11 series, but I am most interested is The new version of the iOS13.

1 pushed on September 19 supplies the "Optimized Battery Charging" function, extend battery life by management of charging power, time management. In the mobile phone world, the iPhone is open to the gate of charging management, but in the electric car, this is too common, in fact, your car may be completely dissatisfied, or it is best not to let it overflow, do you understand? The latest Push IOS13.1 system added "Optimized Battery Charging" function, which is designed to extend battery life running IOS13.

1 device; system will resume more than 80% of the battery through learning users a day charging habit. , Will only be charged to 100% when the user wants. The conditions of use of mobile phone batteries may be relatively good.

On electric vehicles, the use conditions of the power lithium battery are more harsh, and we have a long life power lithium battery, so the lithium ion battery of the electric vehicle has already been equipped with charging management functions. Don't get over the right path. What is the Lithium-ion battery on October 9th, the 2019 Nobel Chemical Award has given three scientists who make a tight contribution for lithium-ion batteries - Johnb (Johnb).

Goodenough, M. Stanley Wit Tinhan (M. StanleyWhittingham, Ji Naki (Akirayoshino).

Today, the lithium-ion battery is in the secondary battery market, especially in the electric vehicle power lithium battery market, "fragrant", but in the initial, the lithium-ion battery is actually evolved by the lithium-ion battery. In the battery, we understand that electrons are negatively charged, and should flow from the negative electrode of the battery to the positive electrode, which requires the battery negative electrode to be easy to lose electronically, and in the chemical element, "lithium" is easy to lose electronically; so The lithium ion battery positive material is manganese dioxide or thionyl chloride (metal oxide or other oxidant), and the negative electrode material is a metal lithium. The discharge reaction of the lithium-ion battery is actually an oxidative reaction of the electrode, so the lithium ion battery pack is completed, and the closed circuit is charged, but if the lithium metal battery is charged, the inside is easily formed to form lithium crystals, resulting in a battery short circuit, so lithium metal Battery prohibits charging, so it is also known as "lithium primary battery".

In the 1980s, some scientists found that lithium ions had the characteristics of embedded graphite, and the process reversible, so the initial birth is a "lithium ion battery" with a carbon compound as a positive electrode in the initial birth. Since the battery charge and discharge process does not have metal lithium, only lithium ions participate in the reaction, in order to distinguish from the "lithium metal battery" mentioned above, such batteries are called lithium ion batteries. Unlike the lithium metal battery, the lithium ion battery can be repeatedly charged and discharge, and the charge and discharge reaction is safer (due to the presence of lithium lithium), we now use the battery of the electric car using a lithium ion battery.

Why can't the lithium ion battery can be filled over, we say that the lithium-ion battery can be repeatedly charged and discharge, but why not exceed the charge, pass the principle of charge and discharge and discharge. Briefly, the charging and discharge of the lithium-ion battery is the process of embedding, moving, deintercalating between lithium ions; when the battery is charged, the lithium ions move from the positive electrolyte to the negative electrolyte, and then embedded Carbon layer structure; when the battery is discharged, the lithium ion is removed from the negative carbon layer back to the positive electrode. I believe this, everyone understands the charging and discharge of the lithium ion battery and the movement of lithium ions, the electrode is related; overcharge, it is possible to cause irreversible damage to the electrode.

If overcharge, it may cause too much lithium The ion-embedded negative electrode carbon layer cannot be escaled. If excessive discharge may cause the negative electrode carbon layer to be depressed, the lithium ions cannot be embedded therefrom during charging; the result of life is reduced, shortened battery capacity. See this, there is no car owner friend worry: How do I make the battery full? Can you always keep it charging? In fact, it is aimed at "overcharge", and new energy car companies have made corresponding charging strategy settings, such as restricting charging power, reservation time, etc.

, try to prevent battery overfilling is one of these functions. 2 How to "protect users" protect battery manufacturers to protect battery manufacturers The basic new energy models can be charged / appointment settings, and even some pure electric automotive types have set some safe power when they leave. Redundancy, the purpose is to prevent overcharge of the power lithium battery.

For example, the Audi E-TRON nominal power lithium battery capacity is 95kWh, but the actual battery has been locked by 12% (not available), which is 83.6kWh; in this way, the manufacturer is redundant by safe power on the hardware The rest prevents users from over-filled with battery. Audi E-TRON except for the battery itself, the user can set the maximum charge setting in the charging setting interface of the car.

If it is a short-distance travel, the system will offer users no need to overflow the power, if long-distance, the system will propose Users charge the power to 100%. This is designed in Tesla, and it is equipped with a model. Take Tesla as an example, the brand model also divides the "daily travel" and "long-distance travel" interface in the "charging limit" interface; if the user is traveling, the Tesla system recommends that users will charge the power to 50 Between% -90%, it does not propose full charge, if long-distance travel, Tesla is recommended to charge the power to 90% -100%.

At the same time, in order to facilitate the user, Tesla is on the mobile phone APP side, and the end of the vehicle has this function. 蔚 来 ES8, ES6 Previously, the mobile phone APP is supplied to the entrance to the upper limit setting of the charging upper limit. From October 10, 2019, it will start to push 2.

3.0 version of the 2.3.

0 version of the ES6 (on October 13), In the new system, the upper limit of the charging upper limit is also supplied in the serving machine; the system also gives a daily travel and long-distance travel, and the former proposes to be 90%, the latter proposes to charge 100%. However, taking BYD as an example, the new energy model of traditional vehicle enterprises has fewer charging upper limit settings, but most of the new energy vehicles of most of the traditional vehicle companies still supply "reservation charging" function, users can start charging according to their own demand settings time. In this way, users can charge, save charging costs, reduce grid pressure; secondly, this function can reduce charging at a certain extent, by delay charging time to reduce charging.

From the principle of charging and discharging of lithium-ion battery, it is possible to have an irreversible damage to the battery. The practices of the vehicle enterprises have also confirmed this. More and more new energy models are selected as the user supply "charging upper limit" "Option.

At this point, we can also understand why certain models of power lithium batteries can be used less than nominal capacity, and the vehicle enterprise pioneer will prevent the occurrence of overcharge, sacrifice part of the electricity, exchanged, to extend the battery as much as possible Life, I think this "business" is cost-effective. Regarding discharge, most users are often suitable, and the idle time will be charged for the vehicle. It does not wait until the vehicle feed is charged.

This does not appear in the low temperature environment, but the battery activity is reduced, compared to normal temperature More prone to excess. Due to the time relationship, many owners will not stare at the time to pull the gun, so it is often more prone to excessive, at this time, the charging upper limit setting will use; for users with fast charge, only charge 80 % Is also the choice of many friends, one is to prevent trickle charging, waste time, second is to prevent over charge, so I personally recommend this charging method. Summary: Actually, the battery is not worried about the battery, because the electric vehicle power lithium battery pack performance is better, and if the battery pack is attenuated more than a certain indicator (generally 20% -30%), the manufacturer will also replace the battery for the owner Package; As of now, there is still a fresh electric car for replacing the battery pack, which can at least prove to a certain extent, the battery of the electric vehicle is not as serious as we think.

Of course, the good battery status is inseparable from the correct maintenance of the owner. I believe that the electric car will give you a good car experience.