Bidirectional lossless equalization circuit of series battery pack based on inductive energy storage

Abstract

The present invention discloses a bidirectional lossless equalization circuit of a series battery pack based on inductive energy storage, wherein, the series battery pack is divided into an upper part and a lower part, the upper half part battery is an upper battery pack, and the lower half part battery is a lower battery pack. Each battery connects an equalization branch circuit, a total equalization branch circuit bestrides and connects a power supply and the earth, and each equalization branch circuit connects a control circuit. The circuit can realize a dynamic equalization during the charge-discharge process of the battery pack, improve a non-equalization phenomenon of the series battery pack, improve an available capacity of the battery pack, reduce a repairing and replacing cycle of the series battery pack, and prolong a service life of the battery pack by controlling the on and off of an upper bridge and a low bridge MOSFET in the equalization branch circuit and the inductive energy storage. Thus, the circuit is suitable for a battery management system of an energy storage device of a hybrid electric vehicle, a pure electric vehicle, or a storage power station.

Description

technical field [0001] The invention relates to series battery equalization technology, in particular to a series battery bidirectional non-destructive equalization circuit based on inductive energy storage suitable for hybrid electric vehicles, pure electric vehicles or energy storage devices in energy storage power stations. Background technique [0002] After multiple charge-discharge cycles in a series battery pack, the distribution of the remaining capacity of each battery cell will roughly appear in three situations: the remaining capacity of individual battery cells is high; the remaining capacity of individual battery cells is low; The remaining capacity of the monomer is high and the remaining capacity of individual battery cells is low. [0003] In view of the above three situations, domestic and foreign scholars have put forward their own solutions. For example, in response to the high remaining capacity of individual battery cells, some researchers have proposed...

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Problems solved by technology

For example, in response to the high remaining capacity of individual battery cells, some researchers have proposed a parallel resistor shunt method, which consumes the energy of the battery module with a high remaining capacity through the resistor by controlling the corresponding switching device. It is wasted in vain, and a lot of heat is generated during the equalization process, which increases the load of battery thermal management

Some researchers have also proposed equalization circuits such as bidirectional DC-DC equalization method and coaxial transformer equalization method. These circuits all use transformers, which increase the cost of equalization circuits.

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