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Device and method for equalizing series energy storage with point-to-point path

A technology of equalization device and equalization method, which is applied in the direction of circuit devices, battery circuit devices, charge equalization circuits, etc., can solve the problems of low energy equalization efficiency, long energy equalization path, and inability to solve point-to-point direct energy transfer of energy storage units, etc. Achieve the effect of fast speed, short energy transfer path and high efficiency

Active Publication Date: 2018-06-22
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The purpose of the present invention is to solve the problems that the existing equalization device cannot solve the point-to-point direct energy transfer of any two energy storage units, the long energy equalization path and the low energy equalization efficiency. The present invention provides a series energy storage equalization device with a point-to-point path and methods

Method used

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  • Device and method for equalizing series energy storage with point-to-point path
  • Device and method for equalizing series energy storage with point-to-point path
  • Device and method for equalizing series energy storage with point-to-point path

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specific Embodiment approach 1

[0032] Specific implementation mode 1: No matter the number of energy storage units is 2n or 2n+1, for the first 2n energy storage units, the same group of energy storage units B 2n-1 and B 2n When performing equalization, the Buck-Boost working mode is adopted, that is, two energy storage cells, corresponding switching tubes, and coupled inductors form a Buck-Boost conversion circuit.

[0033] to combine Figure 4 , when the number of energy storage monomers is 2n, the energy storage monomer B in the second group 3 To energy storage unit B 4 The situation of transferring energy is used as an example to illustrate, and the switching tubes not mentioned are all in the off state. Here the energy storage unit B 3 , B 4 , switch tube S 3 , S 4 、SD 4 、SL 4 and coupled inductor L 4 Constitute a Buck-Boost conversion circuit. Switch tube SD 4 、SL 4 is always on, when the switch tube S 3 Open, S 4 When disconnected, B 3 to L 4 release energy, see the specific current ...

specific Embodiment approach 2

[0034] Specific implementation mode 2: Regardless of whether the number of energy storage cells is 2n or 2n+1, when the two cells in the group are balanced, the flyback working mode is adopted, that is, two energy storage cells and corresponding switching tubes and coupled inductors constitute Flyback conversion circuit. The energy storage unit that releases energy releases energy to the coupled inductor with a label different from its own in this group, and the coupled inductor after energy storage releases energy to the energy storage unit with the same label as itself.

[0035] to combine Figure 5 , the number of energy storage units is 2n+1 in the first working mode, the energy storage unit B in the first group 2 To the n+1th group of energy storage unit B 2n+1 The situation of transferring energy is used as an example to illustrate, and the switching tubes not mentioned are all in the off state. Here the energy storage unit B 2 , B 2n+1 , switch SD 1 、SL 1 , S 2 ...

specific Embodiment approach 3

[0036] Specific implementation method three: no matter the number of energy storage cells is 2n or 2n+1, when one cell is balanced to multiple cells in the group, the flyback working mode is adopted, that is, multiple energy storage cells and corresponding switch tubes , The coupled inductor constitutes the flyback conversion circuit. The energy storage unit that releases energy releases energy to the coupled inductor with a label different from its own in this group, and the coupled inductor after energy storage releases energy to the energy storage unit with the same label as itself.

[0037] to combine Figure 6 , in the first working mode where the number of energy storage units is 2n+1, the energy storage unit B in the n+1th group 2n+1 Energy storage unit B in group 1 1 and energy storage unit B in group n 2n The situation of transferring energy is used as an example to illustrate, and the switching tubes not mentioned are all in the off state. Here the energy storage...

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Abstract

The invention relates to a series energy storage balance apparatus and method with a point-to-point path, and belongs to the power electronic technical field. When the number of series energy storage single units is 2n, 2n coupling inductors with the same number of turns and 6n MOSFET switching tubes are included; when the number of single units is 2n+1, 2n+2 coupling inductors and 6n+4 switching tubes are included; or 2n+1 coupling inductors and 6n+2 switching tubes also can be used. By controlling the on-off of the switching tubes, the single units with relatively high energy release energy to the coupling inductors, and then the energy in the coupling inductors is released to the single units with relatively low energy so as to realize direct balance among the single units. The apparatus has two working modes of Buck-Boost and flyback; and under the flyback working mode, energy transfer from one single unit to many other single units can be realized. By configuring the energy transfer path between any single units, direct balance between any single units is realized; and in addition, the series energy storage balance apparatus and method have the advantages of short energy transfer path, high balance speed, and relatively high efficiency.

Description

technical field [0001] The invention relates to a series energy storage equalization device and method with a point-to-point path, belonging to the technical field of power electronics. Background technique [0002] Energy storage technology is widely used in production and life. General energy storage bodies include lead-acid batteries, lithium-ion batteries, fuel cells, supercapacitors, ultra-high-speed flywheels, etc., among which batteries and supercapacitors are more widely used, especially in electric vehicles and new Energy generation and other fields. Due to the low voltage of batteries and supercapacitors, they are often connected in series to form a series energy storage body. Because of the unavoidable differences between the monomers, the terminal voltage, capacity and other parameters will be inconsistent during use, and it is very easy to overcharge or overdischarge one or some energy storage monomers. An increase in the number of times will lead to a decreas...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J7/00
CPCH02J7/0016
Inventor 杨威杨世彦韩基业谭宇董青山
Owner HARBIN INST OF TECH
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