Fast charge is the use of large current high-power direct current to charge the battery, the principle is that in the state of fast charge, the lithium ions in the lithium battery high-speed movement, instantly embedded in the two poles of the battery.
The method of fast charging is to first charge the battery with a wider charging pulse, so that the end voltage of the lithium battery rises, when the charging time limit set by the charging system is reached, the charging system cuts off the power supply current to suspend the battery charging, and then restart the charging when the interval reaches another charging point, and the process is repeated. When the lithium ions inside the battery all gather to the positive and negative electrodes of the battery, the car battery is quickly filled.
Fast charging technology has high requirements for the battery itself, and the battery itself must have an automatic management system, while having very reliable thermal stability and resistance to high voltage and large current.
To achieve fast charging, you must also have a matching charging system, many cities now provide fast charging pile power is up to 20KW and above, can convert 10KV high-voltage AC into hundreds of amps of direct current, and through a dedicated cable continuous transmission into the car battery system. However, in view of the current battery balance technology, power transmission and distribution technology, especially heat dissipation technology can not meet the requirements of the case, the real sense of fast charging can not be fully realized, compared with ordinary charging technology has greatly shortened the charging time, the most important thing is this fast charging technology, from the principle can be seen, fast charging will not be as serious as the loss of the battery. Sacrifice battery life.
The principle of high voltage, the principle of the car fast charging head is the principle of large voltage, because the current is too large, the voltage is too large, in the process of use, the current spreads fast, so the effect of fast charging head can be achieved, and the daily life should be reasonable use
In general, fast charge for DC charging, fast charge as the name suggests, fast charge is the process of fast charging of the battery, it can be simplified to understand the fast charge mode is to use a large current, in less than 1 hour to quickly charge the battery, followed by the internal battery, fast charge, lithium ion need to accelerate the instantaneous embedding into the negative electrode.
First, charge with a wider charging pulse, the end voltage of the battery rises, when the charging time is set, the charger suspends the charging, and when the charging interval reaches another point, the charger continues to charge.