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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Problems solved by technology

[0004] In view of the above disadvantages, the present invention provides a method for enabling and exit

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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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[0025] In order to better explain the present invention and facilitate the understanding of those skilled in the art, the implementation process of the present invention will be described below with reference to the accompanying drawings and specific embodiments.

[0026] figure 1 The flow chart of the equalization enable judgment method according to an embodiment of the present invention is shown.

[0027] In one embodiment, the battery pack includes a first cell having a first voltage and a second cell having a second voltage, and the voltage of the second cell is higher than the voltage of the first cell. When the vehicle is in an idle state, the parking time of the vehicle is judged. When the parking time exceeds the preset threshold, the battery voltages of all the cells in the battery pack are collected. When the voltage difference exceeds a certain threshold and there is no fault in the current system, the second cell is enabled to balance.

[0028] In step 102, it is determi...

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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...

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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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