In recent years, with the vigorous development of the data center industry, more and more people pay attention to the safety of data centers, and batteries have gradually become a focus of attention. To solve the problem of battery use, we need to look at it from a system perspective, and it will be more helpful to the use of battery and the safety of power supply. Figure 1 is a system model of a computer room. In the event of a power failure, the storage battery serves as an emergency power supply. It is possible that more than 90% of the batteries in the data room rarely encounter a power failure during the life cycle, but the battery must be in a normal condition at all times, otherwise the battery cannot be discharged during a power failure, and the consequences will be very serious. Therefore, the battery is kept in a healthy and usable state to ensure the safety of power supply in the data center. The survey shows that 65% of respondents believe that UPS battery failure is the primary cause of data center downtime; in 2016, equipment failure caused data center downtime, UPS system failure accounted for the largest proportion, accounting for 25%; and in UPS Among the causes of failures, lead-acid batteries
are the main cause of failures, with a probability as high as 50%. There are actually three reasons for battery failure: The first is quality problems, such as liquid leakage and micro-short circuit. Generally speaking, the grounding system of UPS should comply with the provisions of the IEC60346 standard on low-voltage grounding systems. This means that for most UPSs, the center line of the battery pack and the battery rack are grounded. Therefore, when a battery in the battery pack leaks, and the leaked electrolyte flows to the battery rack, a short circuit will be formed between the battery packs and cause an accident. And if there is a micro-short-circuit battery in the battery pack, when the battery is discharged, the voltage of the micro-short-circuit battery will drop rapidly, resulting in insufficient backup time. The second question is about the use and maintenance. Table 1 is the international battery testing and maintenance standards. Although there are not many items in the maintenance specifications, due to the huge number of batteries in the data room, there are hundreds of batteries in the data room, and even thousands of batteries in the more. Therefore, it is always impossible to guarantee 100% reliability of these projects only by people. In addition, there is the charging of the battery. Different battery manufacturers may have different requirements for the charging voltage of the battery. If you set it according to a unified standard, it will cause the battery to be undercharged or overcharged, and long-term undercharge and overcharge will lead to The battery life ends prematurely. The last problem is the aging of the battery. Table 2 shows the charging and discharging principle of the battery. It can be seen from Table 2 that there are side reactions throughout the battery life cycle, and these side reactions are the root cause of battery aging. To sum up, it is difficult to maintain high availability of batteries only by relying on traditional maintenance methods. Is there a better maintenance method? In fact, the battery management system (BMS) is a good solution. However, if you want to improve the availability of batteries through BMS, you must not only understand the actual performance data of the battery for the first time, but also require real-time monitoring of the operating status of the battery, timely discover hidden troubles and issue alarms, and guide maintenance personnel to deal with them correctly. Avoid unnecessary accidents; at the same time, it can accurately evaluate the health of the battery (SOHu003dremaining capacity/rated capacity), and obtain an effective basis for battery replacement and echelon utilization. It not only reduces the system risk of using the battery, but also avoids unnecessary waste of resources. The key to improving the usability of batteries through BMS is: (1) Accurate collection of key feature information of each battery ① Leakage monitoring: closely monitor the change in insulation resistance between the battery bus and the ground, and judge battery leakage. And generate an alarm to prompt the user to solve it to avoid the occurrence of fire; ②Connecting bar status monitoring: strictly monitor the temperature and contact resistance changes at the battery terminal, comprehensively analyze the two aspects of data, and judge the loosening of the connection bar, and Generate alarms to prompt users to solve and prevent fires; ③Micro-short-circuit fault monitoring: closely monitor the open circuit voltage of the battery to determine whether the battery has a micro-short-circuit fault, and generate an alarm to prompt the user to solve it to avoid insufficient battery backup. (2) Accurate analysis and judgment of battery information data①Accurate calculation of SOC and SOH: Through the analysis and summarization of the collected data, the neural network algorithm is adopted to obtain more accurate SOC and SOH, which can effectively guide the operation and maintenance of the battery Work; ②Power charge management parameter self-diagnosis: through the self-diagnosis of battery pack voltage and ambient temperature, analyze whether the equalization charge, float charge and temperature compensation parameter settings of the power supply are correct. If it is wrong, an alarm will be generated to remind the operation and maintenance personnel; ③The power supply Capacity management: By comparing the discharge current with the set load current, it can be judged whether the power supply capacity of the power supply is normal. If it is wrong, an alarm will be generated to remind the operation and maintenance personnel. (3) Intuitively present data results and provide targeted maintenance action guidance①Intelligent charging control: Through the intelligent control of battery charging, the charging circuit can be disconnected under the condition of full capacity, thereby avoiding battery overcharging and reducing Side reactions such as the corrosion of the battery grid and water loss further delay the aging of the battery itself, and essentially make the battery in the optimal state of health, so that it can give full play to its original performance during the entire life cycle, thereby ensuring the safe operation of the system ;
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