AAA Ni-MH batteries

　　What is the difference between fast charging and slow charging of AAA Ni-MH batteries for new energy vehicles?

　　Fast charging and slow charging are relative concepts. Generally, fast charging is high-power DC charging, which can fully charge 80% of the battery capacity in half an hour. Slow charging refers to AC charging, and the charging process takes 6 hours to 8 hours.

　　The speed of electric vehicle charging is closely related to the power of the charger, the charging characteristics of the battery and the temperature. Under the current battery technology level, even fast charging takes 30 minutes to charge to 80% of the battery capacity. After exceeding 80%, in order to protect the battery safety, the charging current must be reduced, and the time to charge to 100% will be longer. In addition, in winter when the temperature is low, the battery requires a smaller charging current, and the charging time will become longer.

　　Fast charging and slow charging of electric vehicles: Why are there two charging modes?

　　We understand that a car can have two charging ports. In fact, there are two charging modes: constant voltage and constant current. Generally, constant current and then constant voltage are used, so the charging efficiency is relatively high. The reason why fast charging is fast is due to the different charging voltage and current. The larger the current, the faster the charging. When it is almost full, switch to constant voltage, which can prevent the battery from overcharging and protect the battery.

　　Fast charging and slow charging of electric vehicles: Why has fast charging not replaced slow charging?

　　The charging current and power of slow charging are relatively small, which is better for battery life, and the charging cost is low during low peak power consumption. Fast charging uses a larger current and power, which will have a great impact on the battery pack and will also affect the life. Fast charging also requires supporting equipment, such as converting AC and DC, so the cost will increase.

　　Fast charging and slow charging of electric vehicles: What should be paid attention to in winter maintenance of electric vehicles?

　　At present, most vehicles use AAA Ni-MH batteries. At lower temperatures, the performance of AAA Ni-MH batteries will decline to varying degrees, which is manifested as smaller charging current and discharge current, and reduced battery capacity. In high cold conditions, it may even be impossible to charge. Driving a vehicle in winter will use warm air, which increases the vehicle's power consumption and reduces the vehicle's driving range.

　　When using electric vehicles in winter, it is normal for the charging time to become longer and the vehicle's driving range to become shorter. When in use, the vehicle should be charged immediately after it stops. The residual heat of the battery can make charging faster. When planning a trip, the vehicle's mileage decreases in winter.

　　The speed of electric vehicle charging is closely related to the charger power, battery charging characteristics and temperature. Under the current battery technology level, even fast charging takes 30 minutes to charge to 80% of the battery capacity. After exceeding 80%, in order to protect the battery safety, the charging current must be reduced, and it will take longer to charge to 100%. In addition, when the temperature is lower in winter, the battery requires a smaller charging current, and the charging time will become longer.

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