Balance bus management circuit of energy transfer type series battery pack and management method of balance bus management circuit

Abstract

The invention discloses a balance bus management circuit of an energy transfer type series battery pack and a management method of the balance bus management circuit. The circuit comprises a balance bus, a load terminated line, a source terminated line, a first bidirectional dc / dc converter, single batteries, a balance resistor, a second bidirectional dc / dc converter and a third bidirectional dc / dc converter; the balance bus is positioned on the right side of the balance resistor; the load terminated line and the source terminated line are connected through the second bidirectional dc / dc converter; the source terminated line is positioned on the left side of the second bidirectional dc / dc converter; the first bidirectional dc / dc converter and the balance bus are connected through the balance resistor; and the single batteries and the second bidirectional dc / dc converter are connected through the source terminated line; and the balance resistor is positioned on the right side of the first bidirectional dc / dc converter. By virtue of the balance bus management circuit and the management method, dynamic energy transfer is realized, the system energy use efficiency is improved, the balance circuit is simple and reliable, and balance can be realized more easily.

Description

technical field [0001] The invention relates to a series battery group balance bus management circuit and a management method thereof, in particular to an energy transfer type series battery group balance bus management circuit and a management method thereof. Background technique [0002] In a battery-powered system, regardless of whether the battery is in the state of charging or discharging, the working current of the battery unit is the same, but due to the differences in internal characteristics, operating temperature and cycle times of individual battery units, the behavior of the battery unit There will also be differences. Generally speaking, the imbalance of lithium batteries is mainly due to two aspects: internal and external factors. Internal factors mainly include differences in manufacturing processes, differences in battery internal resistance, and differences in self-discharge rates. The external cause is mainly due to the difference of the acquisition circuit...

AI Technical Summary

Problems solved by technology

In addition, the temperature difference between batteries will lead to inconsistent battery self-discharge rates, which is also the cause of unbalanced cells. In applications where the number of series connections is small, you can select batteries with the same capacity, equivalent series internal resistance and self-discharge rate. Supercapacitors are used in combination to reduce the uneven voltage of individual cells. However, in high-voltage applications with a large number of series connections, the method of selecting the same parameters becomes unfeasible due to the high cost.

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