Matters needing attention when using batteries in UPS system

by:Power Kingdom     2021-07-07

Battery is a key component of UPS system, and its quality is directly related to the reliability level of all UPS software. No matter how good the UPS design scheme is and how complete the function is, once the battery is invalid, UPS cannot display the continuous power supply system. Do not use cheap lead-acid batteries, this will damage the credibility of all UPS software and cause more damage. Online battery monitoring is the smallest part of the average problem-free time (mtbf) of all UPS software. If you can properly apply and maintain protection, you can increase its useful life, on the contrary, its useful life will be greatly shortened. Therefore, we should master the basic concepts of batteries and common problems in their applications.

Generally, it can be divided into lead-acid batteries, lead-acid maintenance-free batteries and nickel-cadmium batteries. With full consideration of load standards, application natural environment, use time and cost factors, valve-regulated lead-acid batteries are generally selected for maintenance-free batteries . The main feature of the system is that oxygen is generated on the positive plate when the battery is charged, and it turns into water on the negative plate according to chemical changes. Non-maintenance protection is only compared with ordinary batteries. Adding pure water or pure water during the whole application process to adjust the level of lithium battery electrolyte is unavoidable for all maintenance work. Conversely, in order to complete the UPS continuous power supply system, we need to more carefully maintain and maintain the lead-acid battery to maintain the protection of the battery.

(1) Operating temperature is harmful to rechargeable batteries. If the working temperature is too high, it will cause the battery to overcharge and cause steam. If the working temperature is too low, the battery will be undercharged, which is harmful to the charging life of the battery. Therefore, the operating temperature is generally set at 25°C, and the floating operating voltage is set at this level. When using batteries, battery charging is usually carried out in the range of 5c35c, which is less than 5c or higher than 35c.

(2) The deep charge-discharge layer also has an adverse effect on battery life. The higher the charge-discharge depth of the rechargeable battery, the lower the application frequency of the circulatory system. Charge and discharge should be prevented during application. Although UPS has a lower potential difference maintenance function, when a single battery is charged and discharged, the UPS will automatically switch. However, if the rise is load charging and discharging or charging and discharging, it will also cause deep charging and discharging of the battery.

(3) During storage, transportation, and installation, rechargeable batteries will lose part of their capacity due to their service life. Therefore, it should be used before installation and delivery, distinguish the remaining volume of the rechargeable battery according to the open circuit voltage of the rechargeable battery, and then choose different ways to charge. The battery is fully charged every 3 months. Through accurate measurement of open circuit voltage, the advantages and disadvantages of rechargeable batteries can be distinguished. Taking a 12V rechargeable battery as an example, if the open circuit voltage of the rechargeable battery is higher than 80% of the energy storage technology, if the open circuit voltage of the rechargeable battery is charged. When the open circuit voltage is less than 12V, the storage power of the rechargeable battery and the rechargeable battery are both less than 20%.

(4) The charging current of rechargeable batteries is generally represented by c, and its ratio is related to the battery. For example, a 100ah rechargeable battery, c100a. The optimal current of Kangjia lead-acid battery is up and down, and the current cannot be exceeded. Too much current or too little is harmful to battery life. UPS can consider this provision in all normal applications, but it also avoids unexpected situations, such as short-circuit failures of rechargeable batteries.

(5) Battery charging operating voltage. Because the UPS battery belongs to the predetermined working mode, the voltage is in the battery charging state under normal conditions, and it will be charged and discharged only when the power is cut off. In order to improve the service life of the battery, the rising charging head generally adopts the method of constant current source overcurrent protection to operate. When the battery is charged, it becomes a floating charge. If the battery charging working voltage is too high, the battery will be overcharged, but the battery will also be charged enough. Abnormal charging voltage of the battery may be caused by incorrect configuration of the rechargeable battery or common faults of the charging head. Therefore, when installing rechargeable batteries, you must pay attention to the accuracy of the specifications and total number of rechargeable batteries. In addition, the charging head does not need to be a counterfeit charging head.

Currently, advanced UPS adopts an ABM (Advanced Battery Management) three-stage intelligent battery management solution, that is, charging is divided into three stages: initial charging, floating charging and rest:< /p>

The first stage is to balance the battery with constant current charging and charge the battery to 90%.

The second stage is floating charge, the rechargeable battery reaches 100%, and then stop charging;

The third stage is of course natural discharge, at this stage, the leakage current of the rechargeable battery is fully utilized Charge and discharge until the required operating voltage is low, and then repeat the three stages. This method changes the previous charging type and still enables the rechargeable battery within 24 hours a day, thereby increasing the battery's service life.

(6) Due to the choice of the electrolyte system software for the absorption lithium-ion battery, the maintenance-free battery is not easy to cause all the steam for normal purposes, but if the user does not operate properly, it will cause the rechargeable battery on the battery. This causes the air pressure of the rechargeable battery to expand and the pressure valve on the rechargeable battery opens, which will cause the rechargeable battery to crack more seriously.

(7) During the operation of the ascending machine, it is necessary to monitor the DC voltage, the floating current, the working voltage of each bottle, the grounding resistance and insulation of the battery and the DC busbar.

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