
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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