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Serial energy storage equalizing circuit with flexible path

A balancing circuit and energy balancing technology, which is applied to charge balancing circuits, circuit devices, battery circuit devices, etc., can solve the problems of long balancing path, small number of cells that can be balanced, and inflexible balancing methods, so as to improve the balancing speed and The effect of balanced efficiency and flexible energy transfer path

Inactive Publication Date: 2018-09-21
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The invention realizes the direct transfer of energy between any monomers in the series energy storage group, between the groups composed of monomers and adjacent monomers, and between small groups, and solves the problem that the number of cells that can be balanced is small and balanced in the existing equalization circuit. The problem of long paths and inflexible equalization methods, the present invention provides a series energy storage equalization circuit with flexible paths

Method used

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  • Serial energy storage equalizing circuit with flexible path
  • Serial energy storage equalizing circuit with flexible path
  • Serial energy storage equalizing circuit with flexible path

Examples

Experimental program
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Effect test

specific Embodiment approach 1

[0018] The energy balance of the monomers in the group adopts the Buck-Boost working method, combined with figure 2 , taking monomer B in the first group 1 with B 2 The situation of equalization is taken as an example to illustrate, and the unmentioned switch tubes and bidirectional switches are all in the off state.

[0019] Energy storage unit B 1 , B 2 , switch tube S 1b , S 1c , S 1d , S 2b , bidirectional switch Q 1 and coupled inductor L 1 Constitute a Buck-Boost converter, switch tube S 1c , S 1d and a bidirectional switch Q 1 is always on. When S 1b Conduction, S 2b When disconnected, B 1 pair coupled inductance L 1 for energy storage, S 1b In shutdown, L 1 energy through S 2b pass to B 2 , similarly, the control switch S 2b The turn-on and turn-off can turn B 2 The energy is transferred to B 1 , which realizes monomer B 1 with B 2 energy balance.

specific Embodiment approach 2

[0020] Balance the monomer and the group between groups, adopt the flyback working method, combine image 3 , taking monomer B in the first group 2 Take the case of equalization with the second group as an example, the unmentioned switching tube and the bidirectional switch are both in the off state.

[0021] Energy storage unit B 2 , by energy storage unit B 3 , B 4 composed of groups, the switching tube S 1c , S 1d , S 2a , S 3a , S 3c , S 3d , S 4b , bidirectional switch Q 2 and coupled inductor L 1 , L 2 form a flyback converter, the bidirectional switch Q 2 is always on. When the switch tube S 1c , S 1d , S 2a conduction, S 3a , S 3c , S 3d , S 4b When disconnected, B 2 pair coupled inductance L 1 For energy storage, when the switch tube S 1c , S 1d , S 2a Disconnect, S 3a , S 3c , S 3d , S 4b When turned on, L 1 The energy stored in the flyback is transferred to L 2 Medium, L 2 to B 3 , B 4Formed groups release energy. Similarly, by co...

specific Embodiment approach 3

[0022] The group equalizes the group and the monomer at the same time, and adopts the flyback working method, which can take advantage of the characteristics of the multi-channel output of the flyback transformation, combined with Figure 4 , from the first group to the second group and the monomer B in the last group n-1 The situation of transferring energy at the same time is taken as an example, and the switching tubes and bidirectional switches not mentioned are all in the off state.

[0023] Energy storage unit B 1 , B 2 A group composed of energy storage unit B 3 , B 4 A group composed of energy storage unit B n-1 , switch tube S 1b , S 1c , S 1d , S 2a , S 3a , S 3c , S 3d , S 4b , S (n-1)a , S (n-1)c , S (n-1)d , bidirectional switch Q n and coupled inductor L 1 , L 2 , L n / 2 A flyback converter with multiple outputs, bidirectional switch Q n is always on. When the switch tube S 1b , S 1c , S 1d , S 2a conduction, S 3a , S 3c , S 3d , S 4b ...

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Abstract

The invention relates to a serial energy storage equalizing circuit with a flexible path and belongs to the technical field of power electronics. The number of serial energy storage monomers is n, wherein n is an even; the serial energy storage monomers contain n / 2 coupled inductors with the same number of turns, 3n switching tubes and n bidirectional switches; every two energy storage monomers form an energy storage unit. When the two monomers in the unit are equalized, a Buck-Boost converter is formed by using the coupled inductors and the switching tubes, and further energy equalization between the two monomers is realized; when different monomers and units are equalized, corresponding switching tubes and coupled inductors are used for forming a flyback converter, and further transmission of energy between the monomers, between the monomers and the units as well as between the units is realized; by using the characteristic of multiplexed output of the flyback converter, the equalization of one monomer or unit to multiple monomers or the units is realized. The serial energy storage equalizing circuit disclosed by the invention has flexible diversified equalizing modes and the advantages of short energy transmission path and high equalization speed.

Description

technical field [0001] The invention relates to a series energy storage equalization circuit with flexible paths, which belongs to the technical field of power electronics. Background technique [0002] The series energy storage group composed of energy storage units such as various batteries or supercapacitors is widely used in electric vehicles, new energy power generation and other fields. Due to the unavoidable differences among energy storage cells, it is very easy to overcharge or over-discharge one or some cells during series use. If the energy storage group is not balanced, the actual capacity will decrease, Therefore, the energy balance between energy storage bodies has always been one of the key technologies for the practical application of series energy storage. [0003] Generally speaking, the energy of the energy storage body is highly correlated with its voltage, so energy balance is often achieved by releasing the energy of a higher-voltage monomer and supple...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J7/00
CPCH02J7/0019
Inventor 杨威杨世彦王延龙韩基业刘晓芳
Owner HARBIN INST OF TECH
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