The quality of communication of the communication is an important guarantee for the uninterrupted communication network power supply. It is the last line of power supply to the entire communication network to ensure the normal operation of the communication network. Based on battery characteristics and maintenance requirements, battery discharge capacity testing is essential. This paper discusses the pros and cons of two battery discharge capacity test techniques, and provides an innovative full-line battery discharge safety energy saving technology, which is beneficial to solve the problem of solving the safety hazard problem of battery discharge test in decades.1. Current battery discharge technology analysis
1.1 Offline discharge method technical analysis
(1) After the battery is separated from the system, once the market is interrupted, the power supply time of the system standby is significantly shortened, let alone the other group of online batteries have quality problems, which is high. If you want to use this way, it is recommended to enable engine group in advance, and ensure that the power generation unit, switching power supply and other equipment can operate normally, guarantee safety;
(2) There is a large voltage difference between the battery pack and the online battery pack after the end of the offline discharge, and if the operation is improper, the switching power source and the online battery pack are charged by the battery pack after the offline discharge, resulting in a huge spark, which is easy to occur. Safety accident. Discharge it in this way, you need to be equipped with a set of intelligent chargers. After recovering the offline battery group, you will continue to return to the system to solve the problem of fan, which will make the system longer in a single power supply, accident risk high. An additional resume connection is made equal to the voltage equal to the discharged battery pack by adjusting the discharged battery pack. The above operation must be careful;
(3) When this discharge mode is operated from the positive electrode of the battery pack, it is necessary to take off from the negative electrode of the battery pack, especially when the negative electrode of the battery pack is derived, and the operation is not properly shorted, which will cause the system to power the interruption, resulting in a communication accident. happened;
(4) This method is to consume, waste electrical energy, and affect the operating environment of the equipment room equipment through the fake load, which requires maintenance personnel to protect the accident.
1.2 Online evaluation discharge method technology analysis
(1) Adjust the rectifier output voltage to protect the low voltage value (such as 46V), so that all backup battery packs discharge directly to the actual load to the rectifier output voltage protection setting value. Since most battery configuration of the current network system equipment is 1 ~ 4h, the discharge current is large, should consider the battery pack to the device power supply circuit pressure drop and equipment low pressure work threshold, and ensure the safety of the system, online evaluation discharge. The rectifier output voltage is not allowed to be too low (such as 46V), the discharge depth is limited, the discharge time of the actual load is more difficult, and the battery capacity is difficult to accurately, and there is an uncertain factor in the battery performance test, thus the activity of the battery. The discharge test object is difficult to achieve the maintenance expected work effect;
(2) If the two sets of batteries have an inability or an incidental quality problem, when the time is discharged to the rectifier output protection value, it is not easy to be discovered in time. At this time, there is still no reserve battery capacity, there is high risk. In this case, this discharge mode is lower than the offline discharge mode;
(3) Due to the limited depth of discharge, the purpose of the discharge test of the active battery pack cannot be achieved, and more critical is that in the practice of full capacity discharge we often find that some battery packs are normal in the pre-discharge pre-expansion, but In the late stage, some backward batteries began gradually exposed. This part of the backward monomer is not discovered in the depth of this discharge. Therefore, we call this power transmission mode for online evaluation, which can only evaluate battery pack performance, or detect that this battery pack can discharge the length of time of protection voltage, and cannot further check how long it can be discharged outside this time;
(4) Unbalanced battery discharge currents. Each group of batteries will discharge according to its own situation, the load current of the system is discharged, the battery pack, the internal resistance is large, and the current is small, and the healthy battery pack, the internal resistance is low, the power is large, resulting in some backward batteries due to the discharge current is not enough The phenomenon that is unable to expose, and we don't reach our power-on performance quality inspection.
In summary, under the central computer room battery must regularly carry out the needs of capacity testing, there are currently two capacity test methods, and each of them have any drawbacks. Although offline discharge methods can achieve the purpose of battery capacity testing, the workload is too large. The system is low, and the online evaluation discharge method is small, but the system is low, the power is not available, and the potential safety hazard is large. Therefore, the current battery capacity testing method must be reform, and a new, scientific capacity test technology will now be introduced.——Full online discharge technology to achieve battery discharge capacity testing to the expected maintenance quality detection effect, battery discharge maintenance operation is simple and safe, and improved maintenance efficiency and effective implementation.
2, full online discharge technology analysis
Full-line discharge technology refers to the measured battery pack to increase the online supply voltage through the series battery group, which is automatically stabilizing or constant power control output, so that the battery pack is powered by the online load device to achieve the battery cell. Setting of constant power discharge testing or constant power discharge testing to achieve safety and energy efficiency.
Full online discharge principle analysis of the battery pack: The positive electrode series battery pack of the battery pack is fully online discharge device, so that the voltage of the branch of the measured battery is slightly higher than the voltage output or another set of batteries, so The set of batteries can be discharged to the actual load, and the battery pack voltage is changed as the discharge time changes (gradually decrease), and the automatic voltage compensation adjustment is performed by the full online discharge device. The measured battery pack always maintains a constant current or constant power to discharge, and complete the discharge test when the battery pack discharge termination voltage, capacity, time, and monomer voltage reach the discharge threshold we expect. Implement the power of this battery pack online discharge test purpose and expected maintenance effect. 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
