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Circuits and methods for cell balancing

A technology of battery cells and equalizing circuits, applied in charge equalizing circuits, battery circuit devices, secondary battery charging/discharging, etc., can solve problems such as unbalanced battery cells, voltage differences of battery cells, permanent damage of battery cells, etc., to achieve The effect of disequilibrium reduction

Inactive Publication Date: 2009-04-01
AOTU ELECTRONICS WUHAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As the number of charge / discharge cycles increases, voltage differences between cells result in cell imbalance and shortened battery life
[0003] When a battery pack is discharged at a relatively high current for a period of time, if the imbalance of the cells reaches a certain limit, the polarity reversal produced by the smallest capacity battery cell in the battery pack will cause permanent damage to the battery cell. sexual damage

Method used

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  • Circuits and methods for cell balancing
  • Circuits and methods for cell balancing
  • Circuits and methods for cell balancing

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Embodiment Construction

[0018] Detailed reference will now be made to embodiments of the present invention, a circuit and method for battery cell balancing. Although the present invention has been illustrated and illustrated by these embodiments, it should be noted that the present invention is not limited to these embodiments. On the contrary, the invention covers all alternatives, modifications and equivalents which are within the spirit and scope of the invention as defined by the appended claims.

[0019] In addition, in order to better illustrate the present invention, numerous specific details are given in the specific embodiments below. 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 methods, procedures, components and circuits have not been described in detail so as not to obscure the gist of the present invention.

[0020] FIG. 1 is a structural block diagram of a battery cell balan...

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Abstract

A cell balancing circuit comprises a first cell having a first voltage, a second cell in series with the first cell and having a second voltage that is greater than the first voltage, and a bypass path in parallel with the second cell for enabling a bypass current for the second cell if a difference between the first voltage and the second voltage is greater than a predetermined threshold. The bypass current is enabled for a balancing time period that is proportional to the difference between the fist voltage and the second voltage.

Description

technical field [0001] The invention relates to a battery protection system, in particular to a battery unit balancing system. Background technique [0002] In a multi-cell battery pack, individual cells can vary due to aging or battery temperature. As the number of charge / discharge cycles increases, voltage differences between battery cells result in cell imbalance and shortened battery life. [0003] When a battery pack is discharged at a relatively high current for a period of time, if the imbalance of the cells reaches a certain limit, the polarity reversal produced by the smallest capacity battery cell in the battery pack will cause permanent damage to the battery cell. sex damage. [0004] Therefore, when the cells of the battery pack are unbalanced, a circuit and method are needed to balance the battery pack. Contents of the invention [0005] The present invention provides a battery unit balancing circuit, which includes: a first battery unit with a first voltag...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J7/00H01M10/44
CPCH02J7/0016
Inventor 法拉维斯·卢浦康斯坦丁·布克曾晓军盛开义肖安全
Owner AOTU ELECTRONICS WUHAN