What is fast charging and slow charging?
1. There are two charging methods for electric vehicles, DC charging mode
and AC charging mode. Due to different charging times, we usually use DC
charging and AC charging for fast charging and slow charging.
Speaking of fast charging, there is no "fast charging" theme, this is a
wrong theory. Dianjun popularizes it to everyone!
Fast charging and slow charging each have advantages and disadvantages.
Fast charging takes less time and can greatly save time and cost, but the price
is slightly higher than slower charging. Slow charging takes a long time, but is
very cheap. If you charge it at night, you won't delay the next day's use.
Low temperature lithium iron phosphate battery 3.2V 20A -20℃ charging, -40℃
3C discharge capacity ≥70%
2. The power we are talking about is essentially the electrons inside the
battery. When you use it quickly, because the current and power are large, many
electrons move from the positive electrode to the negative electrode at a very
high speed. So it's like the peak period of the Spring Festival, if you don't
have the ability to check the capacity, the battery is the same. Fast charging
has very high requirements on the battery. During the process of temperature
rise, during this period of time, electrons are like subway traffic during peak
hours, quickly charging the internal balance of the battery, and its long-term
battery will decay, affecting life. Slow charging does not have such high
requirements on the battery, because its charging current and power are small,
so it will not cause too much damage to the battery.
Isn't this a quick charge of the battery?
3. It depends on the density of the battery, battery material, battery
temperature, and BMS (battery management system). It depends on the density of
the battery, battery material, battery temperature, and BMS. Cell density,
material, and temperature determine the speed, and Bristol-Myers Squibb's core
components control fast charging. Its main function is to intelligently manage
and maintain all cells, prevent batteries from charging and discharging, extend
battery life, and monitor Battery status. Therefore, for fast charging of
electric vehicles, the BMS controls the input current and voltage to minimize
battery damage during fast charging. Within a limited time (different car
battery warranty times), the loss is negligible. This is why when an electric
vehicle goes to a 4S store for repair, the maintenance personnel should check
the battery pack fault code.
Now the field of new energy is somewhat mature, especially the application
of new energy to automobiles is more popular. Since it is a new energy vehicle,
there must be something very different from a fuel vehicle. Take energy supply
as an example. New energy vehicles do not need to go to a gas station to refuel.
They only need to be charged. There are two ways to charge. Choice: Fast Charge
and Slow Charge. We all know that if the battery brands are different, the
charging time will definitely not be too different, so there are fast charging
and slow charging that we just mentioned. Let’s talk about what fast charging
and slow charging mean in detail, shall we? High-power DC charging is what we
call fast charging. The battery is fully charged in half an hour. Slow charging
is AC charging, which takes much longer, almost more than 6 hours!
In fact, when we usually drive new energy vehicles, if the remaining power
is not enough for us to drive to where we want to go, then we should quickly
find a charging pile near the destination to charge. If we have enough time, can
we choose slow charging mode or slow charging mode? If you really don’t have
time to use the car in a hurry, then use the fast charging mode! In fact, those
who are interested can see that the editor actually recommends slow charging,
because there is a difference between fast charging and slow charging. At this
time, more curious car owners will have such a question, is it better to choose
fast charging? Wouldn't it damage the car's battery?
Low temperature and high energy density 18650 3350mAh-40℃ 0.5C discharge
capacity ≥60%
Something that must be popularized is that most of the power batteries used
in our new energy vehicles should be lithium batteries. Therefore, according to
the structure of lithium batteries, the most important part is the battery core.
It is precisely because of this that we should be slower. A little charging will
help extend the life of the battery. But if we really charge it very fast every
time, there will definitely be some small damage inside the battery. In fact,
when a lithium battery is manufactured, the indicators of each battery are
definitely different. At this time, high-current charging will cause the battery
plates to expand or become relatively loose. It's definitely not a big deal if
we do it once or twice, but if we do this for a long time, the battery will
definitely deviate seriously from our previous working state. Sometimes the
battery capacity will become less. We are sure that the consequences of a sharp
reduction in battery capacity will be You all know, it must be scrapped!
Usually, our companies will conduct some experiments when conducting
research and development of new energy vehicle batteries. These experiments will
also consider charging time and battery damage, so as to select a more moderate
point. We all know that the battery is actually a consumable. If we calculate it
based on charging it only once a day, then we will basically reach the end of
its service life after using it for three or four years.
It is not impossible to use a quick charge when you are really in a hurry,
and it will not cause too serious damage to the battery. This is actually
similar to how we humans smoke. An occasional cigarette is actually not What bad
effects will it have on the body? But if you smoke a pack of cigarettes every
day for several years, it will definitely be bad for your lungs. Compared with
cars, the battery of a small new energy vehicle costs us tens of thousands of
yuan. Including the original maintenance costs, it is extremely high, so we are
the owners of new energy vehicles who are planning to buy now or have bought
them for a long time. We, when choosing the charging mode, we should choose slow
charging first. This can also extend our service life, right?
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