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An equalization circuit for parallel charging and bi-directional flyback type double discharge equalization and a control method thereof

A bidirectional flyback and balancing circuit technology, applied in charge balancing circuits, battery circuit devices, circuit devices, etc., can solve problems such as inconsistent battery energy

Inactive Publication Date: 2019-01-18
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problem of energy inconsistency among a large number of lithium-ion single batteries connected in series in the vehicle-mounted lithium-ion power battery system of an electric vehicle, the present invention provides an equalization circuit and a control method for parallel charging and bidirectional flyback double discharge equalization

Method used

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  • An equalization circuit for parallel charging and bi-directional flyback type double discharge equalization and a control method thereof
  • An equalization circuit for parallel charging and bi-directional flyback type double discharge equalization and a control method thereof
  • An equalization circuit for parallel charging and bi-directional flyback type double discharge equalization and a control method thereof

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Experimental program
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Effect test

Embodiment 1

[0032] Embodiment 1: as figure 1 As shown, an equalization circuit of parallel charging and bidirectional flyback double discharge equalization consists of a battery pack, a relay NC j , bidirectional flyback transformer, Mosfet switch M a , Mosfet switch N b , High reverse voltage Schottky diode G a1 , High reverse voltage Schottky diode G b2 constitute;

[0033] The battery pack consists of n single cells C i Composition, a normally closed relay NC is connected in series between every two adjacent single cells j , the bidirectional flyback transformer consists of a transformer primary winding T i1 , Transformer secondary winding T i2 , Mosfet switch Q i1 , Mosfet switch Q i2 , high reverse voltage Schottky diode D i1 , High reverse voltage Schottky diode D i2 constitute;

[0034] The transformer primary winding T e1 One end of the single battery C e The positive pole of the transformer primary coil T e1 The other end of the Mosfet switch Q e1 Drain, high reve...

Embodiment 2

[0051] Embodiment 2: Take 4 single cells as an example.

[0052] During charging (such as Figure 4 , 5 ), using PWM to control the Mosfet switch to only turn on M a (a=2,3,4), N b (b=1,2,3), control normally closed relay NC j (j=1,2,3,...n-1) Turn it on so that it is in the off state. At this time, all the cells are directly connected in parallel to the power supply, assuming that the order in which the cells reach the charging cut-off voltage is C 3 、C 2 、C 1 、C 4 .

[0053] (1) Control and single battery C 3 Corresponding Mosfet switch M 3 , N 3 disconnected, thereby placing the cell C 3 Isolate the charging circuit.

[0054] (2) Control and single battery C 2 Corresponding Mosfet switch M 2 , N 2 disconnected, thereby placing the cell C 2 Isolate the charging circuit.

[0055] (3) Control and single battery C 1 Corresponding Mosfet switch N 1 disconnected, thereby placing the cell C 3 Isolate the charging circuit.

[0056] (4) Control and single batter...

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Abstract

The invention discloses an equalization circuit for parallel charging and bi-directional flyback type double discharge equalization and a control method thereof, The invention can realize parallel charging, when any single battery reaches the set cut-off voltage, the single battery is isolated from the charging circuit, and finally all the single batteries stop charging due to reaching the set charge cut-off voltage, thereby achieving the purpose of forced equalization. A series of bi-directional flyback transformers are used to control Mosfet switch by PWM to change the circuit structure andbalance the single cell with the lowest SOC and the single cell with the highest SOC in the battery pack, The discharge equalization method considers the equalization of the highest SOC cell and the lowest SOC cell at the same time, which accelerates the equalization rate and can effectively reduce the inconsistency between each cell.

Description

technical field [0001] The invention relates to an equalization circuit for parallel charging and two-way flyback dual discharge equalization and a control method thereof, belonging to the technical field of power electronics technology and storage battery group energy equalization management. Background technique [0002] With the changes of the times and the rapid development of the economy, automobiles have become the main means of transportation, while accelerating the consumption of fossil energy and exacerbating the deterioration of the environment. Electric vehicles are gradually approaching the public's field of vision. Due to their advantages of cleanliness, environmental protection, and low noise, electric vehicles will surely become the mainstream means of transportation in the future. However, the most critical technology for electric vehicles is energy storage, and the storage capacity of electric energy directly restricts development of the electric vehicle ind...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J7/00
CPCH02J7/0016
Inventor 刘红锐李博杜春峰陈仕龙
Owner KUNMING UNIV OF SCI & TECH
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