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Several measures to extend the battery life of AGV trolleys

Several measures to extend the battery life of AGV trolleys

Core summary: The service life of the AGV tractor battery, according to national standards, there should be 750 charge and discharge cycles. Under normal conditions of use, it should be used for 2 years. If the actual use is significantly less than 2 years, there must be an unreasonable use of ingredients. The most important reason is that "overcharge" is on the storage...

The service life of the AGV tractor battery shall be 750 charge and discharge cycles according to national standards. Under normal conditions of use, it should be used for 2 years. If the actual use is significantly less than 2 years, there must be an unreasonable use of ingredients. The most important reason is the damage of the battery caused by "overcharge".

 

 

First, the cause of abnormal damage and charging concept
 
Overcharge causes damage to the positive plate. The fracture of the positive electrode plate is usually at the upper root. This is caused by the corrosion of atomic oxygen on the surface of the plate under overcharge conditions. The connection strength of the lower part of the plate is not reduced, indicating that the distribution of the strong overcharge current is uneven. Caused by conditions. There is no electricity on the charged plate, which is a basic concept that is often misunderstood. If the battery plate after charging is powered, it will be short-circuited by the sulfuric acid electrolyte immediately, so there is no electricity inside the battery, but there is chemical energy. The process of charging is to "transform" electrical energy into chemical energy. If the form conversion of energy is not completed in the battery, the charge is "overcharged", at which point the electrical energy flowing into the battery is used to accelerate battery damage. Therefore, do not think that "the battery will be charged, there will be electricity in the battery."

 

 

Second, to avoid the hardware requirements of "overcharge"
 
(1) The charger should have a 3-level charging function.
 
       The charging current of the battery should conform to and track the current receiving rate of the static battery. The basic procedure is high current constant current, gassing voltage, constant voltage, and small current constant current. The three stages should be automatically converted.
 
(2) Adding an ammeter to the motor car.
 
        The current battery locomotive l does not have an ammeter, and the actual capacity consumed by the locomotive after the task is completed, the charging worker does not know, so the control of the charging process cannot be performed according to the actual state of the battery. The charger can only use "overcharge" to ensure the battery capacity recovery. Based on the actual test data of the ampere meter, the safety margin of the battery capacity can be determined. Under deep discharge conditions, the plates of the battery expand and contract more, and the physical structure of the plates is easily damaged. The lower limit of the use of the battery should be 20% of the capacity, and the capacity of the battery should not be discharged when it is used properly. The conditions of use of each mine are different, and the specified number of traction, slope and number of work are different. Therefore, the safety margins of the mines are different. A reasonable safe use limit should be: 20% + traction discharge capacity = battery use standard Cmin battery below capacity Cmin can not get on the bus. The important task of the battery team is to pick out the battery with a capacity lower than Cmin and replace it with qualified products.
 
(3) Protect the positive electrode of the battery with corrosion inhibitor.
 
When the new battery is activated, the positive electrode protecting agent is added, which can effectively reduce the amount of oxygen deposition during charging, thereby reducing the corrosion of the positive grid by charging. Tests have shown that the actual life of the battery using the positive electrode protector is increased by about 50%.