Analysis of the advantages and disadvantages of series UPS battery packs and charging methods

Advantages and disadvantages of series UPS battery packs: 1. Low cost, simple structure, and easy to implement. 2. Connecting UPS battery packs in series is the only existing method for small companies without Ru0026D capabilities. Disadvantages: The disadvantages of series-connected batteries are equally clear: waste of energy, heat generation, and low equalization efficiency, because it takes time to consume energy by resistors. In the case of high-power battery packs, this must also be considered. In fact, many large companies currently use lithium batteries in series to make electric sprayer battery packs, but some international companies have implemented more advanced equalization methods, which make energy use more efficient and equalize faster. . The balanced charging method of the battery pack of series UPS power supply ●Add a parallel equalizing circuit to each single cell of the battery pack, which has achieved the purpose of shunting. In this mode, when a battery overflows first, the equalization device can prevent it from overcharging, and at the same time convert the excess energy into heat energy to continuously charge the battery that has not overflowed. ●Before charging, each cell is passed one by one, the same load is discharged to the same level, and then constant current charging is performed. This time, a more accurate equilibrium state between each cell is ensured. However, due to the physical differences between individual UPS battery packs, it is difficult for each cell to achieve a consistent effect after deep discharge. Even if the same effect is achieved after discharge, new imbalances will appear during the charging process. ●Test and averagely charge the single batteries in the battery pack on time, in order, and individually. When charging the battery pack, it can be ensured that each battery in the battery pack will not be overcharged or over-discharged, thus ensuring that each battery in the battery pack is in a normal working state. ●Using the time-sharing principle, through the control and switching of the switch components, the extra current flows into the battery with a relatively low voltage to achieve the purpose of balanced charging. This method is more efficient, but the control is more complicated. ●Take the voltage parameters of each battery as the object of balance, so that the voltage of each battery is restored to the same. During equalizing charging, the capacitor is alternately connected to two adjacent batteries through the control switch, accepts the charging of the high-voltage battery, and then discharges to the low-voltage battery until the voltages of the two batteries tend to be the same. This kind of equalization method better handles the problem of battery pack voltage imbalance, but this method is urgently used in occasions with a small number of batteries. ●The whole system is controlled by a single-chip microcomputer, and the single battery has an independent set of modules. The module manages the charging of each single battery separately according to the set procedure, and automatically disconnects after the charging is completed. This method is relatively simple, but it will increase the cost greatly when the number of single cells is large, and it is also not conducive to the reduction of the system volume. Low battery management technology and unreasonable charging and discharging systems are also important reasons for the shortened battery life. For battery packs, in addition to the above reasons, the inconsistency between single cells is also an important factor. Disclaimer: Some pictures and content of the articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous: Is it possible to charge the lithium iron phosphate battery pack with a lead-acid battery charger?