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Inductor-capacitor quasi-resonance-based equalization circuit and control method thereof

An inductance-capacitor, equalizing circuit technology, applied in charge equalizing circuits, battery circuit devices, circuit devices, etc., can solve the problems of large equalizing circuits, many equalizing devices, high power loss, etc., and achieve fast equalizing speed and energy storage devices. Less, improve the effect of battery voltage difference

Pending Publication Date: 2017-09-08
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The main purpose of the present invention is to overcome the shortcomings and deficiencies of the prior art, provide an equalization circuit based on inductance-capacitance quasi-resonance, solve the problem of high power loss in the equalization topology of series battery packs in the prior art, many equalization devices, and equalization circuit volume big cost problem

Method used

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  • Inductor-capacitor quasi-resonance-based equalization circuit and control method thereof
  • Inductor-capacitor quasi-resonance-based equalization circuit and control method thereof
  • Inductor-capacitor quasi-resonance-based equalization circuit and control method thereof

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Embodiment Construction

[0039] The present invention will be further described in detail below in conjunction with the embodiments and the accompanying drawings, but the embodiments of the present invention are not limited thereto.

[0040] figure 1 It is a schematic diagram of a balanced circuit based on inductance-capacitor quasi-resonance, a balanced circuit based on inductance-capacitance quasi-resonance and its control method. unit, a gating switch network connecting the battery pack to the quasi-resonant unit, and a main controller.

[0041] Wherein, the battery pack is composed of n batteries Bi (i=1, 2, . . . , n) connected in series. The inductance-capacitance quasi-resonant unit includes an inductor L, a capacitor C, a switch tube S, and a diode D; the inductor is connected in series with the capacitor, the switch tube is connected in series with the diode and connected in parallel with the inductor-capacitor series circuit; one end It is the positive pole of the balanced DC bus, and the ...

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Abstract

The invention discloses an inductor-capacitor quasi-resonance-based equalization circuit. The equalization circuit comprises a battery pack and an inductor-capacitor quasi-resonance unit and also comprises a gating switch network and a master controller, wherein the gating switch network is connected with a battery pack and the inductor-capacitor quasi-resonance unit; and during the equalization process, the master controller controls the gating switch network and the inductor-capacitor quasi-resonance unit so that the inductor-capacitor quasi-resonance unit is switched in states of charging, discharge and resonance in a circulation way, and a battery with highest energy transfers the energy to a battery with lowest energy through an inductor-capacitor. By the equalization circuit, zero-current switching of a switch can be achieved, zero-voltage differential equalization among batteries is achieved, and the technical effect of higher speed than that of an existing quasi-resonance circuit is achieved. By the equalization circuit, the switch loss of a switch device can be greatly reduced, and the equalization circuit has the advantages of a few energy storage devices, small circuit size and fast equalization speed, and is applicable to a battery management system of an energy storage device in an electric vehicle or an energy storage power station.

Description

technical field [0001] The invention relates to the research field of equalization of battery packs, in particular to an equalization circuit based on inductance-capacitance quasi-resonance and a control method thereof. Background technique [0002] In recent years, with the deteriorating air quality and the scarcity of oil resources, new energy vehicles, especially pure electric vehicles, have become the development hotspots of major automobile companies in the world today. As a key component of electric vehicles, the power battery pack has a major impact on the power, economy and safety of the vehicle. After multiple charging and discharging cycles of the power battery pack, the distribution of the remaining capacity of each battery cell will generally appear to be uneven. If it is not balanced, overcharging and overdischarging will easily occur. In this way, in actual use, the service life of the battery pack will be seriously affected, and there may even be a safety haz...

Claims

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Application Information

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IPC IPC(8): H02J7/00
CPCH02J7/0019
Inventor 康龙云王书彪王则沣冯元彬
Owner SOUTH CHINA UNIV OF TECH
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