AGV car battery brands are now various, including lead-acid battery, nickel metal hydride battery and lithium ion battery.Most manufacturers choose lithium ion battery as AGV car battery power supply.Advantages of lithium-ion battery over other batteries:
1. High voltage channel of lithium ion battery: the uniform voltage of single battery is 3.7V or 3.2V, which is approximately equal to the series voltage of three nickel-cadmium batteries or ni-MH batteries, which is convenient to form the battery power group.
2. Lithium ion batteries have high energy density compared to batteries.Has a high stored energy density, which is now 460-600wh /kg, about 6-7 times that of lead-acid batteries;Compared with lead-acid batteries, lithium ion batteries are light in weight, which is about 1/5-6 of lead-acid products in the same volume.
3. Lithium ion batteries have a relatively long service life. Batteries with lithium ferrous phosphate as the positive pole are charged and released by 1CDOD, which can be used for 1000 times.Lithium ion battery has strong adaptability in high and low temperature, which can be used in the environment of -20℃ to 60℃. Through the process, it can be used in the environment of -45℃.
When choosing AGV batteries, we are able to confirm the battery specifications from a combination of the battery's communication protocol, voltage, weight, application of ambient temperature, safety, and cycle life.
1. Communication protocol
Now AGV car battery communication protocol is important: RS485, RS232, CAN.Select the BMS module of the battery according to the communication protocol.
Consider the extra voltage and maximum voltage at the output to determine the voltage and material of the lithium-ion battery.Meanwhile, the extra voltage of the battery should not be lower than the extra voltage of the motor.However, the full voltage of the battery should not be higher than the maximum voltage of the equipment.Therefore, it is sometimes seen that AGV batteries are 12-series ternary lithium ion batteries with a full voltage of 50.4V, rather than the usual 24V or 48V.