For a long time, both domestic and foreign, whether it is a communication system or a UPS system, people are accustomed to use two sets of batteries in parallel to use with a UPS or a communication device. I don't know if it is because of customary forces or for other reasons. This parallel use has become a principle that designers and users must follow, but the author believes that it is not necessary, as long as the user can follow the battery. The manufacturer's instruction manual is good for battery maintenance. It is enough to use only one set of batteries, not only enough, but also the effect of this group of batteries (such as battery stability, reliability, balance, especially battery The service life, etc.) is much better than when two sets of batteries are used in parallel. This is especially true for valve-regulated sealed lead-acid batteries . So, why is the author's positive proposition (or even disapproval) not to use the battery packs in parallel, and what are the pros and cons of using them in parallel?
First, let's review the characteristics of the parallel circuit. In a parallel circuit, the total voltage is equal to the shunt voltage. That is to say, the charging voltage applied to each of the two groups of batteries connected in parallel is equal to the total charging voltage, that is, U total = U1 = U2. According to the formula of I=U/R, it can be known through calculation that I1≠I2 (because the internal resistance of the two sets of batteries is definitely not the same, that is, R1≠R2, in the case of U1=U2, I1 is definitely obtained. ≠I2 results). That is to say, in the case of the same size of the charging voltage, the battery packs used in parallel between the two groups have different charging currents for each group, and the charging current is small, the internal resistance is small, and the internal resistance is small. The current is large. In this way, it is possible that the battery packs with a small charging current are often in a state of insufficient charging. Over time, this group of batteries may increase its internal resistance due to long-term loss of power, and the internal resistance is larger, and the charging current is more. Small, due to such a vicious circle, the life of this battery is greatly shortened. This is not the case with just a set of batteries. This point is enough to show that the battery pack single-use use is far better than parallel use.
Therefore, the author suggests that users should not use two sets of batteries in parallel when they can meet the needs of the equipment with a set of batteries. Otherwise, the battery life will be shortened, the cost of use will be increased, and the overall performance of the battery will be reduced. This kind of labor and money should not be done. If the power of the device is large, and the two sets of batteries can not meet the power requirements of the device in parallel, and more than two groups, such as three groups, four groups, or even more groups of batteries are used in parallel, it is even more unnecessary. The parallel use of two sets of batteries has brought a lot of disadvantages, and the parallel use of more battery packs is more complicated and more disadvantageous. In this case, it is necessary to use a large-capacity battery that can meet the power requirements of the equipment. If there is no large-capacity specification in the 12V series battery, you can use 2V series batteries, 2V series batteries, various large capacity. There are, you can say how big you can make it. According to the author, the current 2V series batteries in China can reach 6000Ah.
Of course, it is understandable that the designer and the user can improve the reliability of the standby power supply. In the event of an AC power failure, when one of the two sets of batteries cannot be powered, another battery can be secured. Even if it is a matter of doing things, it’s worth it. If we consider the use of battery packs in parallel from this point of view, the author only agrees to use up to two groups of batteries in parallel. If more than two groups are connected in parallel, it is absolutely harmful. If the two groups of batteries are not connected in parallel, please also follow the following principles: First, the batteries used in parallel must be produced by the same manufacturer, and the batteries of the same model and specifications; The battery must be in the same state of the old and new; the third is that the same batch number is shipped at the same time; the fourth is that it is installed at the same time.
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