Lithium phosphate iron battery pack balanced charging research status quo.solar battery storage system Processing

　　The capacity difference between monomer lithium batteries is the most fundamental reason that causes excessive charging and excessive discharge of monomer batteries. One of the solutions is to balance lithium -phosphate iron battery packs. At present, the study of balanced charging mainly focuses on two parts: one is the design of the topology of the balanced charging circuit, and the other is the study of the balanced control strategy. The current research focuses on the design of the topology of the balanced charging circuit. It mainly includes the resistance electricity equilibrium method, the switching capacitance method, the switching inductance method, the two-way DC-DC variant method, the multi-winding transformer method, the distribution equalization method [B2 B2 .3] Wait. At the same time, major semiconductor companies have also launched balanced control integrated chips and supporting solutions. For example, ATMEL has launched ATA6870 and ATA6871 lithium battery parallel resistance diversion discharge balance schemes. In 2010 Balanced schemes, etc.

　　The advantages and disadvantages of the balanced charging method of lithium -phosphate iron battery packs mainly have the following problems:

　　1) Balanced time is a common and serious problem, most of which are in a few hours;

　　2) Most of the existing equilibrium technology is based on battery external voltage balance. Due to the existence of differential battery capacity differences, the characteristics of the power charging voltage of each single battery are inconsistent, especially in the later stages of single battery charging. Quickly, there is a problem of balanced judgment based on the judgment of the consistency of the battery pack as the consistency of the battery pack. At the same time, the study shows that the increase in the capacity of the battery pack before and after the balance is not obvious;

　　3) Poor practicality. During the design of the circuit design, it cannot take into account the use of electric vehicles, and the modular expansion cannot be modified with the increase of the number of battery sections in the battery pack.

　　In summary, there are still many problems in the current research on the balanced charging of the power battery pack. The shortened time of the balanced time, the judgment of the consistency evaluation of the battery pack, and the study of the balanced charging control strategy need to be further deepened and improved.

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