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Efficient and passive balancing control method for lithium ion battery for electric vehicle

A lithium-ion battery, passive equalization technology, applied in electric vehicles, battery circuit devices, current collectors, etc., to achieve the effects of improving equalization efficiency, eliminating inconsistencies, and avoiding damage to voltage acquisition chips and acquisition circuits

Active Publication Date: 2015-02-25
CHONGQING CHANGAN AUTOMOBILE CO LTD
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  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the above problems, the present invention proposes a high-efficiency passive equalization control method for lithium-ion batteries for electric vehicles. By controlling the equalization temperature and the number of equalization cells, the battery cells with high voltage are discharged, so as to achieve the same level as the cells with low battery voltage. purpose of maintaining consistency

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  • Efficient and passive balancing control method for lithium ion battery for electric vehicle

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Embodiment Construction

[0023] In order to better illustrate the present invention and facilitate the understanding of those skilled in the art, the implementation process of the present invention will be described below in conjunction with the accompanying drawings and specific embodiments.

[0024] figure 1 Shown is a flow chart of a passive equalization control method according to an embodiment of the present invention.

[0025] In one embodiment, the battery pack includes the smallest cell with the lowest voltage, includes all the cells whose voltage value is greater than the minimum cell voltage, and includes cells whose voltage difference from the smallest cell is greater than a preset threshold N batteries, including M single batteries that are currently allowed to enable equalization at the same time. When M<N, select the first M cells with the highest voltage among the N cells to start equalization, and wait until the voltage of the highest cell among the M cells is less than that of the hi...

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Abstract

The invention provides an efficient and passive balancing control method for a lithium ion battery for an electric vehicle. Battery cells high in voltage are discharged by controlling the balancing temperature and the balancing number of the battery cells, and therefore the aim of keeping the coincidence between the battery cells high in voltage and the battery cells low in battery voltage is achieved. A battery pack comprises the minimum battery cell with the lowest voltage, comprises the battery cells with the voltage higher than the voltage of the minimum battery cell, comprises N battery cells with the difference values between the voltage of the N battery cells and the voltage of the minimum battery cell larger than a threshold value, and comprises M battery cells which currently allow balancing to be simultaneously started. When M is smaller than N, the first M battery cells with the highest voltage are selected from the N battery cells for balancing starting, and when the highest voltage of the battery cell in the M battery cells is lower than the highest voltage, generated when balancing is not started, of the battery cells, balancing judgment is carried out again; on the contrary, balancing of the N battery cells is started, and balancing judgment is carried out again after the balancing is continued for a period of time.

Description

technical field [0001] The invention relates to a lithium-ion battery management system of an electric vehicle, in particular to a battery equalization control method. Background technique [0002] For a battery pack composed of multiple cells, the capacity state of each cell is different due to the difference in temperature and the inconsistency of the charging and discharging efficiency of the battery. The goal of passive equalization is to discharge the cells with high capacity to the same level as those with low capacity, so as to achieve the purpose of capacity balance in the process of charging and discharging. [0003] The existing passive equalization technology patent "Battery Equalization Device" with the patent number of "CN201010572115.X" only describes the discharge of high-capacity batteries through parallel resistance. During the discharge process, the resistance heats up, and the temperature of the voltage acquisition chip will continue to rise. The more the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J7/00
CPCH02J7/342
Inventor 丁灿杨辉前姚振辉周安健苏岭邓柯军郭晓甜贺刚刘波
Owner CHONGQING CHANGAN AUTOMOBILE CO LTD
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