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Battery pack active equalization circuit based on feedback control, and control method thereof

A technology of equalization circuit and control method, which is applied in the direction of battery circuit devices, circuit devices, current collectors, etc., can solve the problems of weak equalization ability of active equalization circuits, and achieve the effects of low loss, overcoming contradictions, and high energy transfer efficiency

Active Publication Date: 2015-06-10
ELECTRIC POWER RES INST OF GUANGDONG POWER GRID +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But because only one battery can be balanced at any time, for the whole battery pack, the balancing ability of the active balancing circuit is weak

Method used

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  • Battery pack active equalization circuit based on feedback control, and control method thereof
  • Battery pack active equalization circuit based on feedback control, and control method thereof
  • Battery pack active equalization circuit based on feedback control, and control method thereof

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Embodiment Construction

[0020] The battery pack active balancing circuit based on feedback control of the present invention is used to balance the energy storage states of N batteries in the battery pack, where N is a natural number greater than or equal to 2. The active balancing circuit of the present invention includes a controller, an energy storage capacitor C0, and N energy transfer circuits; each energy transfer circuit is composed of a battery-side inductor, a battery-side freewheeling diode, a battery-side switch, an intermediate capacitor, a common-side switch, The common side freewheeling diode and the common side inductance are composed of one end of the battery side inductance as the positive input end of the energy transfer circuit, the other end is connected to the cathode of the battery side freewheeling diode and connected to one end of the intermediate capacitor, and the battery side continues The anode of the freewheeling diode is used as the negative input terminal of the energy tr...

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Abstract

The invention discloses a battery pack active equalization circuit based on feedback control, and a control method thereof. The active equalization circuit includes a controller, an energy storage capacitor and N energy transfer circuits. The controller acquires power information of N batteries in the battery pack and mean power information of the battery pack, and controls a battery side switch in the energy transfer circuit, which is corresponding to one or more batteries provided with greater power than the mean power, to circularly switch on and off alternatively, so that electric energy of the one or more batteries provided with greater power than the mean power can be transferred to the energy storage capacitor through the corresponding energy transfer circuit; and the controller controls a public side switch in the energy transfer circuit, which is corresponding to the one or more batteries provided with greater power than the mean power, to circularly switch on and off alternatively, so that the electric energy in the energy transfer circuit can be transferred to the one or more batteries provided with lower power than the mean power through the corresponding energy transfer circuit. According to the invention, in the battery pack, the energy transfer of the battery of any number and at any position is realized, and the high energy transfer efficiency is guaranteed.

Description

technical field [0001] The present invention relates to a battery pack active equalization circuit based on feedback control and its control method, which is used to realize energy transfer for multiple strings of energy storage units such as battery packs to balance the energy storage state, which is mainly used in new energy products, That is, energy storage products that require electronic circuits for batteries and similar batteries; it includes but is not limited to the following application areas: management systems for lithium-ion batteries, battery management systems for lithium polymer batteries, lead batteries, nickel-cadmium batteries, nickel-metal hydride batteries , supercapacitors, and peripheral electronic circuits of new energy storage products. Background technique [0002] In the battery management system, the equalization circuit is used to balance the state of charge of each battery in the battery pack, which can effectively improve battery performance an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J7/00
Inventor 赵伟罗敏张永旺孙卫明赵建华
Owner ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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