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Double-level-bridge-arm series connection storage cell pack efficient equalizer topology circuit and control method thereof

A battery pack and topology circuit technology, which is applied in the field of battery pack energy balance management, can solve the problems of low balance efficiency of non-energy balance schemes, and achieve the effects of high balance efficiency, strong controllability, and continuous balance current

Active Publication Date: 2015-04-29
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the above prior art, in order to solve the problem of low equalization efficiency of the non-energy equalization scheme, the present invention provides a high-efficiency equalizer topology circuit and its control method for double-layer bridge arm series battery packs. Strong current control ability and high equalization efficiency

Method used

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  • Double-level-bridge-arm series connection storage cell pack efficient equalizer topology circuit and control method thereof
  • Double-level-bridge-arm series connection storage cell pack efficient equalizer topology circuit and control method thereof
  • Double-level-bridge-arm series connection storage cell pack efficient equalizer topology circuit and control method thereof

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Embodiment 1

[0023] Embodiment 1: as Figure 1-7 As shown, a high-efficiency equalizer topology circuit for a double-layer bridge arm series battery pack, including the power switch matrix N of the upper bridge arm, the power switch matrix S of the lower bridge arm, the inductor L, the voltage source E, and two main control switches M1 and M2 ; Wherein the power switch matrix N of the upper bridge arm and the power matrix S of the lower bridge arm are double-layer power switch matrices composed of n pairs of power switches in reverse series; The n lead-out wires at the lower ends of the n switches on the lower bridge arm are respectively connected to the positive poles of n series-connected single batteries; The negative pole of the body battery and the lower ends of the n power switches on the lower layer are all connected to one end of the main control switch M2 and the negative pole of the voltage source E; the other end of the main control switch M2 and one end of M1 are connected to t...

Embodiment 2

[0035] Embodiment 2: as Figure 1-7 As shown, a high-efficiency equalizer topology circuit for a double-layer bridge arm series battery pack, including the power switch matrix N of the upper bridge arm, the power switch matrix S of the lower bridge arm, the inductor L, the voltage source E, and two main control switches M1 and M2 ; Wherein the power switch matrix N of the upper bridge arm and the power matrix S of the lower bridge arm are double-layer power switch matrices composed of n pairs of power switches in reverse series; The n lead-out wires at the lower ends of the n switches on the lower bridge arm are respectively connected to the positive poles of n series-connected single batteries; The negative pole of the body battery and the lower ends of the n power switches on the lower layer are all connected to one end of the main control switch M2 and the negative pole of the voltage source E; the other end of the main control switch M2 and one end of M1 are connected to t...

Embodiment 3

[0039] Embodiment 3: as Figure 1-7 As shown, a control method for a high-efficiency equalizer topology circuit of a double-layer bridge arm series battery pack,

[0040] When a battery pack consisting of n series-connected single cells is in a discharging or resting state, the jth battery Cellj with the lowest state of charge or lowest terminal voltage in the battery pack is charged by the balancing circuit, while all other batteries in the same pack The single cells are not affected, and the equalization energy is transferred from the equalizer to the battery Cellj; when the battery pack composed of n single cells in series is in the charging state, the i-th cell with the highest state of charge or the highest terminal voltage in the battery pack A battery Celli is discharged by the equalization circuit, while all other single batteries in the same group are not affected, and the equalization energy is transferred from the battery Celli to the equalizer;

[0041] When the b...

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Abstract

The invention relates to a double-level-bridge-arm series connection storage cell pack efficient equalizer topology circuit and a control method of the double-level-bridge-arm series connection storage cell pack efficient equalizer topology circuit, and belongs to the technical field of storage cell pack energy equalizing management. The topology circuit comprises an upper bridge arm power switch matrix N, a lower bridge arm power switch matrix S, an inductor L, a voltage source E, a main control switch M1 and a main control switch M2. When a cell pack is in the discharging or static state, the jth cell (Cell j) with the lowest electrical charge state and the lowest end voltage in the cell pack is charged through an equalizing circuit, other single cells in the same pack are not affected, and the equalizing energy is transferred to the Cell j from the equalizing device; when the cell pack is in the charging state, the ith cell (Cell i) with the highest electrical charge state or the highest end voltage is discharged through the equalizing circuit, other single cells in the same pack are not affected, and the equalizing energy is transferred to the equalizer from the Cell i. The topology circuit is simple in principle, continuous in equalizing current, high in controllability and high in equalizing efficiency.

Description

technical field [0001] The invention relates to a high-efficiency equalizer topology circuit and a control method for a battery pack with double-layer bridge arms connected in series, and belongs to the technical field of energy balance management of battery packs. Background technique [0002] With the aggravation of environmental pollution and energy crisis, the development of various electric vehicles using batteries as power sources or auxiliary energy sources has become inevitable. The lithium battery is taken as an example for description below. The nominal voltage of a single lithium-ion battery is up to 3.6v, and multiple single batteries need to be connected in series in use. The overcharge or overdischarge of a single battery will affect the service life of the single battery and the battery pack, and even cause an explosion accident. Therefore, when multiple single batteries are used in series, no single battery is allowed to be overdischarged or overcharged. st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J7/00
CPCH02J7/0016
Inventor 刘红锐张昭怀
Owner KUNMING UNIV OF SCI & TECH
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