On-line battery discharge energy-saving technology
The quality of the backup battery is an important guarantee for the uninterrupted power supply of the communication network. This is the last line of defense to ensure the normal operation of the communication network. According to the characteristics and maintenance requirements of the battery, the discharge test of the battery is indispensable. This article discusses the advantages and disadvantages of the two current battery discharge capacity testing technologies, and provides an innovative all-on-line battery discharge safety and energy-saving technology, which is a useful exploration to solve the hidden dangers of battery discharge testing. In the industry for decades.
1 Current battery discharge technology analysis
1.1 Offline discharge method analysis
(1) After a set of batteries is disconnected from the system, once the main power supply is interrupted, the power supply time of the system backup battery will be greatly shortened. In addition, it is not clear whether there is a quality problem with another set of online batteries, and the risk of this discharge mode is high. If you want to discharge in this way, it is recommended to activate the engine set in advance and ensure that the generator set, switching power supply and other equipment can operate normally to ensure safety;
(2) Offline discharge There is a large voltage difference between the rear battery pack and the online battery pack. If the operation is improper, the switching power supply and the online battery pack will charge the battery pack after offline discharge, which generates huge sparks and is prone to occur. Security incident. To discharge in this way, you need to equip a complete set of smart chargers to charge the recovery of the offline battery pack, and then return it to the system in parallel to solve the spark problem. This will make the system a group with longer power supply time and accidents. The risk is high. The connection is restored by adjusting the rectifier output to be equal to the discharged battery pack voltage. The above operations must be handled with care;
(3) In this discharge mode, the positive pole of the battery pack and the negative pole of the battery pack must be left, especially when the battery pack is disconnected When the negative pole. If the anode is short-circuited due to improper operation, the power supply of the system will be interrupted, causing a communication accident. Happen;
(4) This method consumes batteries in the form of heat and waste electricity through a dummy load, which affects the operating environment of the computer room, and requires maintenance personnel to prevent high temperatures. accident.
1.2 Online assessment of emission technology analysis
(1) Adjust the rectifier output voltage to protect the low voltage value (such as 46V) , So that all the backup battery packs directly discharge the actual load to the set value of the rectifier output voltage protection. Since the backup power supply time of most battery configurations of the existing network system equipment is 1~4h and the discharge current is large, the voltage drop and low-voltage operating threshold of the battery pack to the equipment power supply loop should be considered for the equipment to ensure the safety of the system power supply and adjust the online evaluation emission. The output voltage of the rectifier is not allowed to be too low (for example, 46V), the depth of discharge is limited, and it is difficult to grasp the discharge time of the actual load. It is difficult to evaluate battery capacity. There are uncertain factors in the battery performance test to maintain the activity of the battery pack. The purpose of the discharge test is difficult to achieve the expected maintenance effect; (2) If the two sets of batteries have quality problems, such as capacity loss, inability and backwardness, when they are discharged to the output protection value of the rectifier, it is not easy for maintenance personnel to find out in time it. At this time, the backup battery capacity may be low and there is a high risk. In this case, this discharge mode is not as safe as the offline discharge mode;
(3) Due to the limited depth of discharge, the discharge test cannot be achieved to maintain the battery pack activity. More importantly, in the practice of full capacity discharge, we often find that some battery packs operate normally in the early stage of discharge, but in the middle. Later, some backward batteries began to be gradually exposed. This part is behind the monomer. The depth of this discharge method is not enough and has not been discovered yet. Therefore, we call this discharge mode the online evaluation type, which can only roughly evaluate the performance of the battery pack, or detect the length of time the battery pack can be discharged to the protection voltage, and it is impossible to further check how long the battery pack can last. Except for being discharged from the hospital at this time;
(4) The battery discharge current between the groups is unbalanced. Each group of batteries will naturally distribute the load current of the system according to its own conditions. The battery pack is backward, with large internal resistance and low current. A healthy battery pack has low internal resistance and large current sharing, which causes some backward batteries to have insufficient discharge current. Phenomena that are too large to be exposed do not meet the purpose of our quality test for discharge performance.
In summary, under the requirements of battery capacity testing in the central computer room, the current two capacity testing methods have their own characteristics and drawbacks. Although the offline discharge method can achieve the purpose of battery capacity testing, the workload is too large. The system safety is low, and the workload of online evaluation of the discharge method is relatively small, but the system safety is low, and the purpose of battery capacity testing is not achieved, and the potential safety hazard is large. Therefore, it is necessary to reform the current battery capacity test method and introduce a new scientific capacity test technology-full online discharge technology, so that the battery discharge capacity test can achieve the expected maintenance quality inspection effect, and the battery discharge maintenance operation is simple and safe. Improve the efficiency of maintenance work and implement it effectively.
