1 Introduction
The battery is the final part of the reliability of the system is dependent on the reliability of the system, the weakest link failure occurs, many serious accidents are originated from the battery. The only important system was equipped with a battery backup power supply system. Although some battery from the installation to the designated exit transport seems to be no question, the actual situation may never use to the battery discharge, battery powered once needed, but failed to confirm whether the battery power supply, it will cause great losses, even catastrophic. So, for the battery purchase, acceptance, testing, maintenance and maintenance must not let down.
Selection and specification 2 battery
To make the battery system has higher reliability, we must first correct selection of battery, battery with UPS and communication in the design have different: some battery has good cycle characteristics; some battery suitable start; some battery suitable for low temperature environment; some battery suitable for small current discharge and so on. In the selection of the battery, the understanding of the differences between various battery in the process and use is necessary to fully understand the requirements, electrical performance and user of the battery on the performance of the product itself.
Demand for users of the product. For example, back-up power system capacity requirements, the frequency of use, the use of the environment, the main use, service life, reliability requirements, discharge rate, the rectifier battery related performance specifications and other requirements.
The supplier's products promise. Product design parameters (battery types, size, appearance of rated capacity, rated voltage, weight, weight ratio of energy, volume ratio of energy, the design life of the positive and negative electrode plates, piece number, positive and negative plate thickness ratio, electrolyte density, plate type, plate grid material), the product of electric performance parameters, the actual use of the product life, the installation and use of the environment, the different types of performance and price, different product warranty etc..
To discharge capacity blackout state calculation, select the appropriate model of cell:
Cc= Kk Cs /Kc
Kk - capacity reserve coefficient, 1.25.
Kc - capacity conversion coefficient, corresponding to the end of discharge voltage is 1.8V, the relationship curve design manual battery discharge capacity and discharge time.
Cc accident full stop condition, long time discharge capacity.
Battery specifications corresponding instructions in IEEE Std.485, the user in determining the cycle life of the system, we can easily compare the selected battery specifications. Process in the choice of suitable for use in battery, should consider a few factors below:
Kt - temperature correction factors, so that batteries can work normally in the lowest temperature expected in the environment.
Kd - design margin factors, so that batteries can compensate for the extra load.
Ka - aging factors, so that batteries can meet its service life.
3 battery room design
Layout and environment of the battery room, will greatly affect the system reliability and service life, in the design should consider the following:
Temperature control: high temperature will shorten the service life of battery. In the 92F degrees, reach the rated life of only half of the service life of storage battery. Low temperature will make the battery capacity decreases, in 62 F degrees, the battery should be loss of about 10% of capacity. Therefore, the battery room temperature must be centralized control. The highest and lowest temperature difference should be less than 5 F deg.. Otherwise it will make the floating charge voltage of the single battery is not stable.
Maintenance channel: the battery room must have aisle, for maintenance personnel to replace the battery and clean. If there is no set aside this channel maintenance work, all are unable to. If the cabinet is stuffed full, maintenance staff can not come into contact with the pole terminal of the battery. When the battery performance decline in three months or less, the maintenance staff can not realize the seriousness of the problem.
Safety: safety aspects should include consideration of issues: the tool with the acid mist discharge port, cabinet ventilation cooling, cleaning, lighting effects and convenient export. Generally do not use two layer above the battery holder.
4 acceptance and storage battery
The user must follow the correct procedures for acceptance and storage battery, in order to ensure the quality of installation and use. The following are the three most important step:
(1) damage to check: in the battery after delivery, to be checked immediately, so that users can quickly grasp the damaged or missing components of the situation. Because if you reflect on the question of the time too late, will not only increase the loss, and the claim from the manufacturer or supplier companies would also be very difficult.
(2) after the completion of the inspection, can be installed. After the installation is complete, charging, full of electricity after floating for 72 hours, and then as the full capacity test. If the battery capacity testing, acceptance is completed.
(3) after the completion of acceptance, the battery must be re charged floating charge, 72 hours later, after the measurement to judge the performance of its internal resistance as the base value. If the internal resistance in the mean values of + 5%, as the resistance matching, more than the average of 5% of the best replacement battery supplier is required, because of the difference between the value of battery internal resistance of life too much will be affected.
The store should be cool and dry, high temperature and fast self discharge rate will make the battery internal friction increase.
If must be charged, if the battery storage time has been more than six months, the user still they are not boost charge, so most manufacturers do guarantee will not be achieved. If the battery is stored at high temperature 92F degrees, the time is three months.