(1) can be divided into random charging and full cycle charging according to the charging time. If there are more charging points in the AGV process to ensure the timely loss of electric energy, the battery life and the capacity of the battery will be greatly extended by the shallow charging and shallow discharge of the battery. Full cycle charging requires AGV to withdraw from the service, enter the designated charging area, and charge when the battery power is reduced to a specified range.
(2) the charging area can be divided into online charging and off-line charging, and online charging means that AGV does not need to leave the job and does not need special time to charge. Instead, it uses the short stopping time in the work process to recharge. This charging mode takes full advantage of the time of fragmentation, and does not occupy the working time. In fact, it is the extension of random charge. The charging station will be embedded in the workflow of AGV to further improve the efficiency of AGV. Offline charging is the AGV exit service, which is charged to the charging area or a special charging station.
(3) classification by operation method can be divided into: manual, battery and automatic charging. When the power of AGV is insufficient, the ground control center is directed to the designated charge area or platform. The electrical connection between the AGV and the charger is done manually by the full-time personnel and then charged. After completion, the connection circuit can also be disconnected to restore the working state. Manual charging AGV is characterized by safety, reliability, simplicity and low cost. The automation requirements are not very high, fewer cars, and standard working systems. And ensure that AGV endurance needs large battery. You can't work 24 hours a day.
When the battery is charged, the battery can be replaced manually by the full-time personnel when the AGV power is insufficient. AGV can be put into operation. Use the replaced battery pack after charging. Its characteristic is simple and quick, and it can realize AGV that works continuously for 24 hours. But it needs double battery pack, high cost and novel method. It is often used for high timeliness and lack of vehicle response to work. The above two methods need a special person to supervise, waste manpower and reduce automation level. Once lost, it will cause AGV to be unable to work.
Automatic charging, that is, when the AGV needs to add energy, it automatically reports and requests automatic charging, commanded by the ground control center, and goes to the designated charge area or platform. The vehicle charging connector is automatically connected to the ground charging system and charged. After charging the battery is completed, the AGV car is automatically separated from the charging system and run to the working area or the standby area. The automatic charging AGV is suitable for long time work, less cars and automation.
4. According to the electrical connection mode of the charger, it is divided into contact charging and wireless charging.
Contact charging means that all charging circuits need to be connected by a cable and a charging contact to connect the vehicle to the power system so that it can be charged directly. Contact charging can provide a large charging current for fast charging. At present, it is the first choice for off-line charging. But it is not suitable for frequent random charging, there is a charge contact wear, need to be replaced regularly. There may be sparks in the charging process, and there are potential safety hazards. In addition, because the charging contacts are bare parts, they can not work normally at low temperature condensation, humid, flammable and explosive conditions.
Wireless charging is a non - contact charging device. It does not need to connect the vehicle to the power supply system by cable. It abandons the charging contacts, the charger and the electronic device can achieve non conductive contact exposure. The wireless charging technology makes the electrical isolation between the charging terminal and the AGV energy storage system fundamentally eliminate the disadvantages of direct plug-in charging. It is safer and more applicable. At the present stage of the AGV wireless charging product, the charging efficiency is comparable to the charging efficiency of the contact battery charger. Because of its non-contact wear and high intelligence, it is very suitable for online charging. To do it completely is to be filled, that is to stop. It further improves the automation level of AGV usage. But its technology is complex and its cost is high.