Shunt equalization charging method

Abstract

The invention discloses a shunt equalization charging method of each single cell in a storage battery. Each cell monomer in a series battery group is connected in parallel with a shunt device. All the shunt devices are connected with a detection circuit. The detection circuit and all the shunt devices are connected to a control circuit. During a charging process, the detection circuit detects a total voltage of a battery pack and each cell monomer voltage, compares each cell monomer voltage with an average monomer voltage and determines cell monomers whose voltages are higher than the average monomer voltage. The control circuit starts the shunt devices which are connected in parallel with the cell monomers whose voltages are higher than the average monomer voltage so that shunt is performed on charging currents of the cell monomers till the voltages of the cell monomers are equal to the average monomer voltage. According to the method of the invention, when the charging begins, equalization motion of reducing the charging currents is performed on the monomers whose monomer voltages are high so that problems that the monomers are overcharged or discharging is performed after overcharge and electricity is consumed or the electricity is transferred to other monomers during the whole charging process are not generated; an equalization speed is rapid and an equalization effect is good.

Description

technical field [0001] The invention relates to the field of storage batteries, in particular to a method for equalizing charging of individual cells in the storage battery. Background technique [0002] The storage battery is composed of a plurality of single cells connected in series, and the storage battery pack is composed of a plurality of storage batteries connected in series, and has been widely used in electronic equipment in the fields of transportation, electric power, and communication. Practice shows that the life of the battery pack is much lower than the life of the single battery. The most fundamental reason is that when the charging equipment charges the battery pack, the current flowing through each single battery is the same. However, due to the capacity of the single battery There are differences. When charging with the same charging current, some single cells will not be fully charged, while some single cells will be overcharged, that is, the charging of ...

AI Technical Summary

Problems solved by technology

These equalization methods or devices all have some battery cells that are released and lost after being overcharged or transferred to some cells that are undercharged, and there is energy loss during the secondary transfer. The battery cells are charged first and then discharged, which will also affect the battery charging cycle life

In addition, these equalization chargers all use an equalization range as the basis for the high or low voltage of the single battery, but the range of the single cell voltage changes during the battery charging process is relatively large, and this fixed equalization range is used as the basis for equalization The method can only be carried out in the later stage of charging or after charging is completed, which will increase the overall charging equalization time, or lead to a shorter equalization time, which will affect the equalization effect

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