Switching circuit, system and method for balancing battery cells

A technology of battery cell and equalization method, which is applied in the field of conversion circuit and battery cell equalization system, and can solve problems such as poor equalization effect of the battery management system

Active Publication Date: 2012-05-23
AOTU ELECTRONICS WUHAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because each battery cell 102_K (1≤K≤M) will obtain energy from the magnetic core, and the battery cell with the highest voltage value will receive a corresponding current, so the balancing effect of this battery management system 100 is poor

Method used

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  • Switching circuit, system and method for balancing battery cells
  • Switching circuit, system and method for balancing battery cells
  • Switching circuit, system and method for balancing battery cells

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Embodiment Construction

[0047] A detailed description will be given below of embodiments of the present invention. In the following detailed description of the invention, numerous specific details are set forth in order to provide a thorough understanding of the invention. However, it will be understood by those skilled in the art that the present invention may be practiced without these specific details. In other instances, well-known schemes, procedures, components and circuits are not described in detail in order to highlight the gist of the present invention.

[0048] figure 2 Shown is a block diagram of a battery management system 200 according to one embodiment of the present invention. The battery management system 200 can transfer energy among the battery cells 202_1 - 202_6 connected in series in the battery pack 202 to balance the battery cells 202_1 - 202_6 . For ease of description, in figure 2 In the illustrated embodiment, the number of battery cells is set to six. However, the n...

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Abstract

The present invention discloses a switching circuit, a system and a method form balancing battery cells. The method for balancing multiple battery cells which are grouped into multiple battery modules includes: obtaining cell parameters of the battery cells, respectively; calculating an average cell parameter for each of the battery modules according to the cell parameters; identifying a donator module and a receiver module from the battery modules based upon the average cell parameter; and transferring energy from the donator module to the receiver module to balance the battery cells. A circuit for balancing battery cells in the present invention uses a converter to transfer energy from the donator module to the receiver module, thus the system for balancing battery cells in the utility model can be suitable for a charging process, a discharging process and an idle state of the battery, and can raise balancing efficiency and reduce complexity of the system.

Description

technical field [0001] The invention relates to a battery management system, in particular to a battery unit equalization system and method for performing equalization processing on a plurality of battery units and a conversion circuit applied to the battery unit equalization system. Background technique [0002] A battery pack having a plurality of battery cells, such as a lithium-ion battery pack, is widely used in power tools to power the power tools. Power tools include, but are not limited to, electric vehicles and hybrid electric vehicles. However, each battery cell will have a difference due to the degree of aging or the temperature of the battery. As the number of charging / discharging cycles increases, the voltage or capacity of the battery cells will vary, resulting in unbalanced battery cells. [0003] More precisely, if cell imbalance occurs during the charging process, when the battery management system detects that the battery cell with the lowest capacity has ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J7/00
CPCY02E60/12H01M10/482H01M10/4207Y02T10/7055H01M10/42H02J7/00H02J7/0016Y02T10/70Y02E60/10
Inventor 张卫张楚涛陈松涛栗国星
Owner AOTU ELECTRONICS WUHAN
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