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Multi-winding-transformer-based automatic battery equalization circuit and implementation method thereof

A multi-winding transformer and battery equalization technology, applied in the direction of charge equalization circuit, battery circuit device, arrangement of multiple synchronous batteries, etc., can solve the problems of inconsistency of transformer windings, complex design and control, high circuit cost, etc., and achieve equalization speed quickly , easy modularization, low cost effect

Inactive Publication Date: 2018-03-23
SHANDONG UNIV
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Problems solved by technology

However, this method requires an additional degaussing circuit (a capacitor and magnetizing inductance forming an LC resonant circuit) to absorb and discharge the energy stored in the transformer when the switch is turned off
This leads to the disadvantages of inconsistent transformer windings, high circuit cost, large size and complex design.
And in order to obtain soft switching, the equalization circuit can only work at a specific switching frequency and duty cycle, making its design and control complicated

Method used

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  • Multi-winding-transformer-based automatic battery equalization circuit and implementation method thereof
  • Multi-winding-transformer-based automatic battery equalization circuit and implementation method thereof
  • Multi-winding-transformer-based automatic battery equalization circuit and implementation method thereof

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Embodiment Construction

[0034] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0035] It should be pointed out that the following detailed description is exemplary and intended to provide further explanation to the present application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

[0036] It should be noted that the terminology used here is only for describing specific implementations, and is not intended to limit the exemplary implementations according to the present application. As used herein, unless the context clearly dictates otherwise, the singular is intended to include the plural, and it should also be understood that when the terms "comprising" and / or "comprising" are used in this specification, they mean There are features, steps, operations, means, components and / or combinatio...

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Abstract

The invention discloses a multi-winding-transformer-based automatic battery equalization circuit and an implementation method thereof. The automatic battery equalization circuit comprises a pluralityof battery groups, a micro controller, and multi-winding transformers. Each battery group consists of a plurality of single battery bodies and is provided with one multi-winding transformer; secondarywindings of all multi-winding transformers are connected in parallel and are connected with the corresponding battery groups by diodes; and positive and negative electrodes of the single battery bodies are connected with the corresponding transformer windings by switching tubes. The micro controller controls turning on or off of all switching tubes simultaneously. Automatic and simultaneous equalization from any single battery body to any single battery body among the multiple battery groups is realized by one path of PWM control signals.

Description

technical field [0001] The invention relates to an automatic battery balancing circuit based on a multi-winding transformer and a realization method. Background technique [0002] Lithium-ion batteries are widely used in electric vehicles due to their advantages of no memory effect, high energy density, high cell voltage and good safety. In order to meet the voltage and power levels of electric vehicles, a large number of lithium-ion battery cells need to be combined in series and parallel. However, due to differences in manufacturing processes and working environments, the internal resistance and capacity of battery cells are not completely consistent. During the use of the battery pack, these inconsistencies will gradually accumulate, and cause the voltage imbalance of different battery cells in series, which may lead to overcharging or over-discharging of a certain battery cell, reducing the available capacity and cycle of the battery pack. life, and even cause damage t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J7/00
CPCH02J7/0019
Inventor 商云龙张承慧张奇段彬崔纳新周忠凯
Owner SHANDONG UNIV
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