Since the electric car market operation, due to the battery self-discharge rate caused by the battery cell voltage is too low, seriously affecting the electric car charging vehicle and range of the case appears frequently, after checking, the problem occurs in the vehicle battery pack,Battery recycling machine usually just a battery cell voltage is too low, resulting in the whole battery pack power storage and range capacity decreased significantly, typically manifested as the charging capacity becomes smaller, shorter range.
In the battery pack, when a cell battery self-discharge rate is high, it will cause insufficient power storage capacity, and the most obvious feature is that the cell battery voltage is continuously low, the voltage rises slowly when charging, and the voltage falls quickly when discharging,cylindrical battery pack mahcine which creates a serious inconsistency problem in the whole battery pack.
In solving the inconsistency problem, based on technical and cost reasons, the current electric vehicles usually use passive equalization technology, the most ideal state can only realize the charging equalization function, but the passive equalization technology has a few serious defects,cell stacking machine one is unable to solve the problem of equalization of the discharge, the second is the equalization of the current is too small and the start-control voltage is too high, which makes its application in the electric vehicle effect is greatly reduced, far from the expected. This technical defect makes it ineffective for the battery cells with high self-discharge rate in the battery pack, which will be in the state of low voltage and low battery for a long time, and the range will be reduced naturally.
High self-discharge rate of the battery cells in the battery before the formation of the group is difficult to find, the existence of parts and self-discharge rate of the high and low with obvious uncertainty, can not be predicted, in view of the current battery management technology, if you want to improve and stabilize the self-discharge rate of high cell voltage, the only feasible preventive technology route is currently only through the battery equalization technology to achieve, to be precise, can only be used in the transfer of battery equalization technology route, because the transfer type battery equalization technology has inherent technical advantages, first, to support the battery pack charging, discharging the whole process of equalization; second, the equalization current is large, usually can reach the level of amperes, is passive equalization of a few times to dozens of times; third, the equalization efficiency is high, the equipment during the work of the heat is small, the utilization of electric power is high; these technical advantages so that during its work, it can completely solve the problem of low voltage caused by high rate of self-discharge of the battery cells. These technical advantages make it possible to completely solve the problem of low voltage caused by high self-discharge rate of unit battery during its working period.
Of course, transfer battery equalization technology also has its obvious shortcomings, such as complex technology (complex control circuits, passive equalization of the simplest circuit is only a few components), high equipment cost (passive equalization cost of more than ten times), equipment volume (circuit complexity, coupled with the configuration of transducer devices, the volume is inevitably larger), coupled with different design architectures, the adaptability of different.
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