First of all, we must know how fast charging and slow charging work, according to the working principle of fast charging refers to providing short-time fast charging services with large current within 20 minutes to 2 hours of electric vehicle parking. This is like a battery is a large bucket, under the same capacity, in order to quickly fill the water, then it is necessary to increase the flow of the outlet and the diameter of the water pipe, only when its diameter and flow increase, under the same circumstances, the large flow will quickly fill the bucket, and the trickle is difficult to fill the bucket, the need for a certain period.
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From this comparison, it can be seen that fast charging is to increase the current of the charging battery in the maximum range that the battery can withstand to achieve the requirements of battery replenishment and endurance, while slow charging is to reduce the input current and voltage of the battery to achieve, and naturally slow charging is more conducive to the maintenance of the battery than fast charging.
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Now new energy electric vehicles are becoming more and more common, but because of the limitations of certain factors and the different technical levels of each electric vehicle charging method is not the same, we must use the charging method in accordance with the manufacturer's guidance requirements to use, to ensure the safety of battery use.
There is no clear distinction between \"fast charge\" and \"slow charge\" of the charger, which is defined according to the charging current.
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1, in general, assuming the capacity of the battery is 1C, then 0.1-0.2C rechargeable battery is called slow charge.
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2, greater than 0.2C is called fast charging, greater than 0.8C is called super fast charging, less than 0.05C is trickle charging.
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3. Take the 1800mAh nickel-metal hydride battery as an example, the charging current between 180mA and 360mA is slow charging
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4, for the 700mAh battery, the charging current in this range is fast charging.