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Series battery pack direct equalization method based on converter

A series battery pack and equalization method technology, which is applied in the direction of charge equalization circuit, battery circuit device, arrangement of multiple synchronous batteries, etc., can solve the problems of many components, large system volume, complex control signals, etc.

Active Publication Date: 2020-03-06
HENAN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the method based on inductance equalization has high equalization efficiency, but its circuit structure is complex, requiring a large number of switch tubes and inductors, which is not conducive to the reduction of the volume of the equalization system; the equalization time based on capacitance is longer, especially when the battery cell When the voltage difference between the cells is not large; although the equalization method based on the transformer can shorten the equalization path and improve the equalization efficiency, because each battery needs a transformer, the system is bulky and requires many components. Complex, high system cost

Method used

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  • Series battery pack direct equalization method based on converter
  • Series battery pack direct equalization method based on converter
  • Series battery pack direct equalization method based on converter

Examples

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Effect test

Embodiment 1

[0055] Such as figure 1 As shown, a converter-based direct equalization method for series battery packs, the equalization circuit based on the direct equalization method includes series battery packs, 2n+3 MOS transistors, 2n+5 diodes, two flyback converters, An RCD snubber circuit; the battery pack in series is composed of n single cells;

[0056] Each single cell in the series battery pack is marked as B in turn 1 , B 2 , B 3 ,...,B n ; Each MOS transistor in the equalization circuit is marked as S in turn 0 , S 1 , S 2 ,...,S 2n+2 .

[0057] The first flyback converter is located on the left side of the equalization circuit, and the second flyback converter is located on the right side of the equalization circuit;

[0058] There are two MOS transistors on the positive and negative poles of each single battery; the right side of the first flyback converter is the primary side, and the left side is the secondary side, and the upper and lower ends of the primary side ...

Embodiment 2

[0085] Such as image 3 As shown, a converter-based direct equalization method for series battery packs, the equalization circuit based on the direct equalization method includes series battery packs, 11 MOS transistors, 13 diodes, two flyback converters, and an RCD snubber circuit ; The series battery pack is composed of 4 single cells. Each single cell in the series battery pack is marked as B in turn 1 , B 2 , B 3 , B 4 ; Each MOS transistor in the equalization circuit is marked as S in turn 0 , S 1 , S 2 ,...,S 10 .

[0086] The first flyback converter is on the left side of the equalization circuit, and the second flyback converter is on the right side of the equalization circuit.

[0087] There are two MOS transistors on the positive and negative poles of each single battery; the right side of the first flyback converter is the primary side, and the left side is the secondary side, and the upper and lower ends of the primary side are respectively connected to th...

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PUM

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Abstract

The invention discloses a series battery pack direct equalization method based on a converter. An equalization circuit on which the direct equalization method is based comprises a series battery pack,2n + 3 MOS transistors, 2n + 5 diodes, two flyback converters and an RCD buffer circuit. The series battery pack is composed of n single batteries. The circuit is characterized in that: (1) the wholeequalization circuit only needs two flyback converters for energy transfer, and the size is small; (2) the expansion is easy, and when the number of the single batteries included in the series battery pack is changed, only the corresponding MOS transistors need to be added; and (3) equalization control strategies of the charging and discharging processes of the series battery pack are combined into one, and in the charging and discharging processes, discharging equalization of the single battery with the maximum terminal voltage and charging equalization of the single battery with the minimumterminal voltage are realized simultaneously.

Description

technical field [0001] The invention belongs to the technical field of battery equalization, and relates to a direct equalization method for series battery packs based on a converter, which is suitable for battery management systems in new energy vehicles. Background technique [0002] In recent years, with the increasingly serious environmental pollution and the increasing scarcity of oil resources, new energy vehicles have become more and more popular. Lithium batteries have gradually become the main power source of new energy vehicles due to their advantages such as high energy density, large output power, and long cycle life. Due to the low voltage of lithium battery cells, it is generally necessary to connect batteries in series to form a battery pack. However, due to factors such as production technology and use environment, the single battery will appear unbalanced after a period of cycle charging and discharging, thereby reducing the energy utilization rate of the b...

Claims

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Application Information

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IPC IPC(8): H02J7/00
CPCH02J7/0016H02J7/0019
Inventor 郭向伟耿佳豪胡志国许孝卓谢东垒高岩刘震
Owner HENAN POLYTECHNIC UNIV
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