How to extend the life of solar street lamp battery

How to extend the life of solar street lamp batteries 1. To prevent overcharge, the life and performance of solar street lamp batteries are closely related to the heat accumulation inside the battery. The heat source inside the battery mainly comes from the power loss of the internal electrochemical reaction. Look at the product of charging voltage and charging current. In the oxygen recombination reaction, the floating charge current will increase to generate more heat. During constant voltage charging, the floating charge current will increase with the increase in temperature, which will further increase the temperature. The phenomenon of thermal runaway is a unique phenomenon caused by the structure of the valve-controlled sealed battery. Thermal runaway often brings serious hazards such as battery loss, shell ‘bulging’, etc. In severe cases, the battery will be scrapped. To prevent overcharging is to provide the charging voltage value strictly according to the manufacturer's instructions. The current combined power supply can be set up and realize intelligent management. It should be noted that firstly, it must be set correctly, and secondly, unauthorized personnel can not change it at will.　　2. To prevent undercharging 　　 is the opposite of overcharging. Undercharging is mainly caused by low or too low charging voltage settings. Or there is a problem with the rack system.　　3, to prevent over-discharge 　　 the depth of discharge is closely related to the number of charge and discharge cycles (service life) of the battery design. For example, when the depth of discharge is 5%, the number of cycles is 10,000, and when the depth of discharge is 50%, the number of cycles is only 800. Severe over-discharge will cause the battery to no longer be activated to the best state, or even scrapped. Different discharge rates have different discharge time and termination voltage, and the effective capacity released is also different, and is affected by the ambient temperature. The relevant curves are no longer listed and drawn here, as they are given in the battery manuals of different manufacturers. The maintenance personnel should pay attention to it and set it in the monitoring unit strictly according to the relevant data, and should not change it randomly. Now the rack power supply manufacturers have designed the battery power-off function, that is, when the solar street lamp battery discharges to the set end voltage, the battery discharge circuit is automatically cut off through the monitoring command. The manufacturer also considers that the monitoring unit cannot detect the termination voltage of the battery for some reason (depending on its working power source) or cannot issue a command when the other equipment forces the circuit to be cut off. Therefore, maintenance personnel should also pay attention to the reliability of these hardware circuits during inspections, and perform inspection and maintenance. 4. Controlling the ambient temperature When the battery temperature increases, the electrolyte activity increases, the internal resistance of the battery decreases, and the increase of its floating charge current leads to intensified corrosion of conductive elements and reduced life span; on the contrary, the electrolyte activity weakens and the internal resistance of the battery increases. The discharge capacity of the battery to the load is weakened. Therefore, it is very necessary to monitor the battery temperature of solar street lights and control and maintain the ambient temperature. At the same time, the charging voltage must be temperature-compensated to avoid overcharging at high temperatures and undercharging at low temperatures. In most places where VRLA battery packs are used, the ambient temperature is controlled at about 25 degrees. The accelerated life test shows that an increase of 10 degrees in ambient temperature without adjusting the charging voltage will shorten the battery life of solar street lights by half. 5. It is necessary to replace the faulty battery in time. Due to the process difference of each monomer, the long-term floating charge may gradually 'lag behind'. Therefore, there will be a management function to periodically charge the battery pack in the monitoring unit to activate this Be behind the single body, make it no longer behind. But often falling behind, it may eventually become a malfunctioning battery. We can use a variety of methods to determine whether it is dying, such as a separate capacity test, or online testing of its internal resistance. The key is to replace the faulty battery in time, which is very important to the availability of the solar street lamp battery pack and the life of the entire group.　　 6. It is recommended to carry out the capacity test and discharge test of the battery pack regularly. The capacity test is to conduct a physical examination of the battery pack. Of course, the workload is relatively large, but considering the needs and possibilities, it is recommended to conduct a sampling test when possible