Two-stage equalizing charging system and application thereof

A charging system and two-level equalization technology, which is applied in the direction of current collectors, electric vehicles, electrical components, etc., can solve the problems of high equalization efficiency, complex control circuits, and difficulty in realization, and achieve production cost savings, strong system scalability, and charging high efficiency effect

Inactive Publication Date: 2014-03-19
HUBEI UNIV OF TECH
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Problems solved by technology

Among various equalization schemes, the equalization control technology can be divided into two types: dissipative equalization diffusion and non-dissipative equalization: the dissipative equalization method is simple to control, but there will be energy loss; the discharge two-

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  • Two-stage equalizing charging system and application thereof
  • Two-stage equalizing charging system and application thereof
  • Two-stage equalizing charging system and application thereof

Examples

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[0028] The present invention will be described in further detail below in conjunction with the drawings and embodiments.

[0029] The present invention adopts a multi-stage equalization control strategy to provide a two-stage equalization charging system, figure 1 It is the principle block diagram of the two-level equalization charging system. In order to overcome the limitations of the centralized equalization method and the decentralized equalization method, the present invention provides a battery pack for electric vehicles with a large number of batteries (generally composed of hundreds of single cells). A two-stage equalization charging system, wherein the first-stage equalization module adopts a multi-winding transformer magnetic model, and the second-stage equalization module adopts an improved multi-primary winding DC-DC equalization model. figure 2 It is the equivalent circuit diagram of two battery balancing models.

[0030] image 3 It is a schematic diagram of the magne...

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Abstract

The invention discloses a two-stage equalizing charging system and an application thereof. A first-stage equalizing module adopts a multi-winding transformer magnetic model, and a second-stage equalizing module adopts an improved multi-primary-winding direct current (DC)-DC equalizing model. The application of the second-stage equalizing charging system on a hybrid electric vehicle storage battery pack is characterized in that the hybrid electric vehicle storage battery pack is subjected to multi-stage grouping, and then the battery pack is controlled step by step. The two-stage equalizing charging system is high in equalizing speed, good in voltage consistency and applicable to the occasions where a vehicle-mounted battery of a hybrid vehicle is large, has the advantages of being good in equalizing effect, high in charging efficiency, good in system expandability and the like, and has good application prospects in the fields of energy saving and new energy automobiles.

Description

technical field [0001] The invention belongs to the field of energy-saving and new-energy vehicles, and relates to a two-stage balanced charging system and its application. Background technique [0002] With the tension of energy issues, in the long run, hybrid vehicles are the future development trend, and hybrid vehicles are considered to be the most promising models at present, so hybrid vehicles will be the mainstream of new energy vehicles in the future. Since battery energy has lower energy density and poor battery life than gasoline energy, it is particularly important to cycle charge the battery. The unbalanced phenomenon in the charging process will cause some batteries to be overcharged. And some batteries are in a state of undercharging, which has a great impact on the life of the battery. [0003] Therefore, in order to reduce the battery unbalance of the battery pack connected in series, it is necessary to control the balance of the battery pack during the char...

Claims

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Application Information

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IPC IPC(8): H02J7/00
Inventor 吴铁洲柏袆山席自强李子龙
Owner HUBEI UNIV OF TECH
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