fast charge
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Fast charge is an emergency charging method, using DC charging, the DC charging voltage is generally greater than the battery voltage, the need to convert alternating current into direct current through the rectifier device, the power battery pack voltage resistance and protection put forward higher requirements; The charging current is large, ten times or even dozens of times that of conventional charging current.
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Advantages: Half an hour can be filled with 80% of the battery capacity. After more than 80%, in order to protect the safety of the battery, the charging current becomes smaller, and the time to charge to 100% will be longer. Disadvantages: Due to the characteristics of high charging voltage and large current, it causes certain damage to the battery and reduces the service life of the battery at the cost of reducing the number of battery charging and discharging cycles.
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trickle charge
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Advantages: The charging current and power of slow charge are relatively small, which is better for battery life, and the charging cost is low when the electricity is low. Disadvantages: Charging time is too long, generally requires 6 hours to 8 hours.
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Slow charge generally refers to the charging in the 220V AC socket of the home, because the battery can not accept AC charging. Therefore, it first converts 220V AC to DC and then boosts the charging voltage of the battery, such as 500V DC, and then charges the battery with the 500V DC. Since the general household 220V AC socket is 10A and 16A, for safety reasons, the charging current of slow charge is generally less than 10A, according to the standard calculation of 10A, the maximum charging power of slow charge is about P=UI=220V*10A=2.2KW. Since 16.25KW is much larger than 2.2KW, we can find that fast charging is much, much faster than slow charging.
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difference
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The charging speed of electric vehicle is closely related to the power of charger, battery charging characteristics and temperature. At the current level of battery technology, even fast charging takes 30 minutes to charge to 80% of the battery capacity, after more than 80%, in order to protect the safety of the battery, the charging current must be smaller, and the time to charge to 100% will be longer. In addition, when the temperature is lower in winter, the battery requires a smaller charging current, and the charging time will become longer