Inductance-capacitance dual-energy storage component-based series battery pack equalization circuit

Abstract

The invention discloses an inductance-capacitance dual-energy storage component-based series battery pack equalization circuit. The series battery pack equalization circuit is used for equalizing a battery pack comprising n series batteries and comprises an energy storage unit, a switch unit and a control unit, wherein the switch unit comprises (n+1) battery switches, one of the batteries is connected between adjacent two battery switches, all battery switches arranged at odd positions are connected in parallel to form a first switch sub-unit, all battery switches arranged at even positions are connected in parallel to form a second sub-switch unit, the first switch sub-unit, the energy storage unit and the second sub-switch unit are sequentially connected in series, the energy storage unit comprises an inductor and two capacitors which are connected in parallel, and the inductor and the two capacitors are respectively connected in series with an energy storage switch. By the series battery pack equalization circuit, the equalization circuit is greatly simplified, energy is transferred by employing the two capacitors and the inductor, energy exchange between two arbitrary batteriesof the battery pack is achieved, the unbalanced energy of the battery pack is improved, the available capacity of the battery pack is improved, and the service lifetime of the battery pack is prolonged.

Description

technical field [0001] The invention relates to battery group equalization technology, in particular to a series battery group equalization circuit based on inductance and capacitance double energy storage elements. Background technique [0002] After the battery pack has gone through multiple charge and discharge cycles, there are roughly three situations in the distribution of the remaining capacity of each battery cell: the remaining capacity of some battery cells is high; the remaining capacity of some battery cells is low; The remaining capacity of some battery cells is high and the remaining capacity of some 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 a parallel resistor shunt method, which consumes the energy of the battery module with a high remaining capacity...

AI Technical Summary

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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