What is the difference between the capacity and rated capacity of double-access batteries?
What is the difference between the capacity and rated capacity of double-access battery? The capacity of Shuangdeng batteries is defined as the electric energy emitted by the active substances participating in the electrochemical reaction. The rated capacity of batteries refers to the minimum amount of electricity that should be released under certain discharge conditions when designing and manufacturing batteries. The amount of active substance contained in the charge of the battery after charging is calculated from the electrochemical theory, which is called capacity. The actual capacity of batteries refers to the actual amount of electricity released by batteries under certain discharge conditions. Because of technological reasons, the actual capacity of batteries can not be completely identical. The process of classifying batteries according to their capacity is called rated capacity through a certain charge-discharge system.
The inherent capacity of double-access batteries is the maximum energy that can be stored. The retained capacity is the energy value that can be provided by the double-deck battery under the current conditions. Charged state refers to how much energy the battery actually receives at present. The decrease of inherent capacity, undercharge and overdischarge of batteries will lead to the decrease of retained capacity. The reserved capacity of double-access batteries is what we really care about. Assessment of retained capacity is very complicated. In fact, retained capacity is only a vague concept, because when people talk about retained capacity, they generally do not mention the retained capacity at a certain discharge rate and a certain temperature, but the retained capacity at different discharge rates is different from that at a certain temperature, but it does not matter. We can roughly judge the charging state by the end voltage, and then the root. According to the change of inherent capacity, the storage capacity of battery at room temperature is calculated. The ambient temperature of substation and communication base station is close to 25 degrees, and the evaluation value of charging state is close to 100% in floating charging state. Be careful. Here I'm talking about the start voltage, not the floating charge voltage measured online.
The following points should be paid attention to in the maintenance and maintenance of double-access batteries:
1. Maintaining an Appropriate Environmental Temperature
According to the test, once the ambient temperature exceeds 25 C, the life of Tangshao battery will be reduced by half for every 10 C increase. At present, UPS batteries are generally maintenance-free sealed lead-acid batteries, the design life is generally 5-10 years, which can be achieved in the environment required by battery manufacturers. If it fails to meet the required environmental requirements, its life span will vary greatly. In addition, the increase of ambient temperature will lead to the increase of chemical activity inside the battery, which will generate a lot of heat energy, and in turn will promote the increase of ambient temperature. This vicious cycle will accelerate the shortening of battery life.
2. Regular charging and discharging usually depends on the ambient temperature. The optimum ambient temperature required by battery manufacturers is between 20 and 25 degrees Celsius. Although the discharge capacity of the battery is improved with the increase of temperature, the cost is that the life of the battery is greatly shortened.
Shuangdeng batteries used in UPS power supply equipment are in floating charge for a long time. Over time, the activity of chemical energy and energy conversion of batteries will be reduced, aging will be accelerated and service life will be shortened. Therefore, the discharge should be completed every 2-3 months, and the discharge time can be determined according to the capacity and load size of the Shunden battery. After a full-load discharge is completed, the charge shall be recharged for more than 8 hours according to the regulations. The floating charge voltage and discharge voltage in UPS power supply have been adjusted to the rated value at the time of leaving the factory. The discharge current increases with the increase of the load. The load should be adjusted reasonably in use, such as controlling the number of electronic devices such as microcomputers. Normally, the load should not exceed 80% of the UPS rated load. Within this range, the discharge current of the battery will not be excessive discharge.
3. Utilizing Communication Functions
At present, most large and medium-sized UPS have the operability of computer communication and program control. Install the corresponding software on the computer, connect UPS through serial/parallel ports, run the program, you can use the computer to communicate with UPS. Generally, it has the functions of information inquiry, parameter setting, timing setting, automatic shutdown and alarm. Through information inquiry, information such as input voltage, UPS output voltage, load utilization ratio, battery capacity utilization ratio, in-machine temperature and power frequency can be obtained. Through parameter setting, basic characteristics of UPS, battery maintenance time and battery exhaustion alarm can be set. Through these intelligent operations, it is convenient to use and manage UPS power supply and its batteries.
4. Replacement of Batteries in Time
When one or more batteries in Shuangdeng batteries are damaged, maintenance personnel should check and test each batteries to eliminate damaged batteries. At present, the number of batteries equipped with large and medium UPS power supply varies from 3 to 80, or even more. These individual batteries are connected by a circuit to form a battery pack to meet the needs of UPS DC power supply. When replacing new batteries, we should strive to purchase batteries of the same type as those of the same manufacturer. It is forbidden to mix acid-proof batteries with sealed batteries and batteries of different specifications. In the continuous operation and use of UPS, due to the difference in performance and quality, the performance of individual batteries is degraded and the storage capacity is not up to the requirements, and damage is inevitable.