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Lithium ion battery equalization control enablement method and quitting method for hybrid vehicle

A technology for hybrid electric vehicles and lithium-ion batteries is applied in the field of lithium-ion battery management systems for hybrid electric vehicles to achieve the effect of reducing differences

Inactive Publication Date: 2015-12-02
CHONGQING CHANGAN AUTOMOBILE CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of the above disadvantages, the present invention provides a method for enabling and exiting battery balancing to overcome the defect of using working voltage to balance the control of batteries

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  • Lithium ion battery equalization control enablement method and quitting method for hybrid vehicle
  • Lithium ion battery equalization control enablement method and quitting method for hybrid vehicle

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Embodiment Construction

[0025] 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.

[0026] figure 1 Shown is a flow chart of a method for judging equalization enablement according to an embodiment of the present invention.

[0027] In one embodiment, the battery pack includes a first cell having a first voltage and a second cell having a second voltage, the voltage of the second cell being higher than the voltage of the first cell. When the vehicle is in the idle state, judge the parking time of the vehicle. When the parking time exceeds the preset threshold value, collect the battery voltage of all cells in the battery pack. When the second cell and the first cell When the voltage difference exceeds a certain threshold and the current system is not faulty, equalization is enabled for the sec...

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Abstract

The invention provides a lithium ion battery equalization control enablement method and a quitting method for hybrid vehicle, and the control enablement method is as follows: when the vehicle is in an idle state, parking time of the vehicle is determined; if the parking time exceeds a preset threshold, battery voltages of all monomers of a battery pack are collected; if the voltage difference exceeds a certain threshold and a present system does not have fault, an equalization is enabled to carry out for the battery monomer. In the equalization process, if the voltage difference is less than a certain threshold, or the vehicle has a power on request, or the equalization temperature is higher than a certain threshold, or an equalization time exceeds a certain threshold, the equalization function quits from the monomer battery which is carried out with the equalization. According to the invention, the equalization enablement method and the quitting method can be carried out for correct effective equalization start and close control in the prerequisite that the battery and the vehicle are safe, and reduce differences between battery monomers.

Description

technical field [0001] The invention relates to a lithium-ion battery management system of a hybrid electric vehicle, in particular to a battery equalization control method. Background technique [0002] For a battery pack containing multiple batteries, due to differences in battery temperature and battery aging during use, the state of the batteries is different. As the number of charging and discharging increases, the voltage difference between the batteries becomes larger and larger, resulting in imbalance between the batteries and shortening the service life of the batteries. [0003] Existing equalization technology, such as "a BMS equalization control method" disclosed in Chinese patent document CN103531857, only describes the battery cell equalization consistency judgment based on the battery voltage difference, but the battery voltage is divided into two types: working voltage and open circuit voltage. The open circuit voltage is determined by the characteristics o...

Claims

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Application Information

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IPC IPC(8): H01M10/42H01M10/44
CPCY02E60/10
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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