Introduction to the balancing principle and charging method of the battery pack of series UPS power supply

Balance principle of series UPS power battery pack 1. The series UPS power battery pack is a high-power battery pack that supplies power to the car in an electric vehicle. In order to ensure the capacity of the entire battery pack, it is necessary to balance the battery management. 2. A variety of battery management ICs in the battery pack market for series UPS power supplies provide voltage equalization management functions. Users only need to connect some external components to achieve this, but unfortunately, most battery management ICs use Resistive shunt/power consumption is used to achieve the balance between each battery. 3. Series UPS power battery packs. In the era of lead-acid batteries, various methods have emerged for the balance of battery packs. 4. Series-connected lithium-ion battery resistance shunts and consumes energy. This method is the most common and simplest method on the market. The protection boards for battery packs exhibited at the 2009 Electric Bicycle Exhibition also include protection boards for electric vehicles, and their balancing methods are all realized by resistors. The reason is also very simple: easy to implement, there is no better way. In fact, it is the cheapest way. 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 is fully charged first, the equalization device can prevent it from overcharging, and at the same time convert the excess energy into heat energy to continue to charge the battery that has not been fully charged. ●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. ●Inspect and evenly 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 equilibrium, so that the voltage of each battery is restored to the same level. 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 solves the problem of battery voltage imbalance, but this method is mainly 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 when the number of single cells is large, the cost will increase greatly, and it is also not conducive to the reduction of the system volume. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous: What is the reason for the short life of high-rate polymer batteries?