In recent years, with the vigorous development of the data center industry, the security issues in the data center are increasingly attached, and the battery is also slowlycoming a focus of attention. Solve the problems in the battery, you need to look at it from the perspective of the system, will be more helpful for the use of the battery, which is more helpful to power supply.Figure 1 is a system model of a computer room. When a power failure is malfunction, the battery acts as an emergency power supply. There may be more than 90% of the battery in the data room, and the battery must be touched once in the life cycle, but the battery must always be in normal conditions. Otherwise, the battery cannot be discharged, and the consequences will be very serious. Therefore, the battery is kept in a healthy state to ensure the power supply of the data center.
The survey shows that 65% of respondents believe that the UPS battery fault is a primary reason that leads to downtime of data center; in 2016, the equipment failure causes the downtime for data center, the UPS system fault is the largest, accounting for 25%; and in UPS In the cause of the failure, the lead-acid battery is the main reason for the fault, the probability is as high as 50%.
The cause of the battery is actually divided into three: the first is quality problems, such as leakage and micro short circuit. In general, the UPS grounding system should comply with the provisions of the IEC60346 standard on low voltage grounding systems. This means that for most UPS, the centerline and battery frames of the battery pack are grounded. Therefore, when there is a battery in the battery pack, the leakage of the leakage is flowed to the battery frame, and the battery pack is short-circuited to cause an accident. If a micro-short battery occurs if a micro-short battery occurs in the battery pack, the voltage of the micro-short battery will decrease rapidly, resulting in insufficient preparation time.
The second problem is used to maintain the problem, Table 1 is the international battery test maintenance standard.
Although there are not many projects in the maintenance specification, because the number of batteries in the data room is huge, there are hundreds of hundreds of sections, and more even can even reach thousands. So the light of these projects will be implemented, and it is always impossible to ensure 100% reliable. In addition, there is a battery charging. Different battery manufacturers may be the same for the battery's charging voltage requirements. If they are set according to unified standards, they will cause the battery to charge or overcharge, long-term inclusive charge and overcharge can result in Battery life is terminated in advance.
The last problem is the aging problem of the battery, Table 2 shows the charging and discharge principle of the battery.
As can be seen from Table 2, there is a sub-response throughout the life cycle of the battery, which is the root cause of the aging of the battery.
In summary, it is difficult to keep the battery high availability. Is there a better maintenance? In fact, the Battery Management System (BMS) is a good solution. However, if you want to increase the availability of the battery through BMS, it is necessary to understand the actual performance data of the battery, but also require real-time monitoring of the operating state of the battery, timely discovery of fault hidden dangers and issue an alarm, guiding the maintenance personnel correctly. Avoid unnecessary accidents; at the same time, it is possible to accurately evaluate the health of the battery (SOH = remaining capacity / rated capacity) to obtain an effective basis for battery replacement and ladder utilization. Reduce system risks using batteries and avoid unnecessary resources waste.
Improve the availability of the battery through BMS, the key is:
(1) Accurate collection of key feature information for each battery
1 Monitoring of leakage: Strictly monitor the change in insulation impedance between battery busbar and ground, judge battery leakage, and generate alarm prompt users to solve it, avoid fire occurrence;
2 Connection strip status monitoring: Strictly monitor the temperature of the temperature and contact internal resistance at the battery terminal, combined analysis of the two aspects, judge the connection strip loosening, and generate alarm prompt users to solve, prevent the occurrence of fires;
3 Micro-short fault monitoring: strictly monitor the open circuit voltage of the battery, determine whether the battery has a micro-circuit failure, and generate a alarm prompts the user to solve it, avoiding the battery's preparation.
(2) Accurate analysis and judgment on battery information data
1SOC, SOH precise measure: Through the analysis and summarization of the acquisition data, the neural network algorithm is used to obtain more accurate SOC, SOH, effectively guide the operation of the battery;
2 Power charging management parameters self-diagnosis: By battery pack voltage and ambient temperature self-diagnosis, analysis of power supply, floating and warm complement parameter settings are correct, if it is wrong, generate alarm to remind the operator;
3 Power supply capacity management: By comparison of discharge current and setting load current, it can be judged whether or not the power supply capacity is normal, if an error is generated, an alarm reminds the operator.
(3) Intuitive data results and provide targeted maintenance
1 Intelligent charging control: By smart control of battery charging, in the event of full capacity, it can disconnect the charging circuit, thereby avoiding battery overcharge to reduce the side effect of battery grid corrosion and loss of water to further delay the battery itself. The aging, from essentially of the battery in the best health, allowing it to give full play to the original performance throughout the lifecycle, thereby ensuring the safe operation of the system;
2 High temperature protection: In high temperature, the system can disconnect the charging circuit, on the one hand, significantly reduces the aging rate of the battery at high temperatures, improve the high temperature resistance of the battery, and prevent the battery from appearing thermostat;
3 Seamless protection of discharge: Intelligent charging control and battery circuit control involved in high temperature protection measures, only for charging circuit, and for discharge loops, it is necessary to keep turning on, thereby ensuring seamless discharge of the battery, Change to the discharge state at intervals of 0 ms;
4 Intelligent Operation and Maintenance Guidelines: The battery management system has a perfect expert library, and can integrate analysis of the relevant parameters and status for each alarm of the battery, and output guidance that can be used for maintenance. And suggestions, make the operation and maintenance work. This can improve operation and maintenance efficiency, and also reduce the human material needed for maintenance work;
5 Daily Automatic Inspection: According to the operation and maintenance management system and process, the battery device can be automatically inspected according to the rules set, and the inspection report is generated, and the inspection efficiency is improved, and the error rate of the artificial inspection is reduced.
Through the battery management system, the operation and maintenance personnel can understand the cause of the alarm, through the expert system, analyze the fault and guide the air operation, so that the maintenance is simpler. Battery management systems should make people who do not understand batteries, becomes a maintenance expert of batteries through system platforms.
Note: The article is transferred from - computer room 360 network Recommend: LiFePO4 Battery Manufacturer Energy storage battery Manufacturer Integrated machine energy storage battery series Manufacturer Lead lithium battery Manufacturer Outdoor Backup Battery Manufacturer Portable outdoor power supply Manufacturer Power battery Manufacturer Powerwall LiFePO4 Battery Manufacturer Battery rack Manufacturers Telecom LiFePO4 Battery Manufacturer Wall mounted battery storage Manufacturer China Lifepo4 Battery
