Battery pack active equalization method based on center drift clustering analysis

A technology of cluster analysis and active equalization, which is applied in the direction of charge equalization circuits, electric vehicles, secondary batteries, etc., can solve the problems of low equalization efficiency, achieve the effects of improving efficiency, ensuring consistency, and improving effects

Active Publication Date: 2020-01-17
NANJING UNIV OF SCI & TECH
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Problems solved by technology

The commonly used control method is balanced control based on voltage consistency. The energy is transmitted from the battery cell with the highest voltage to the battery cell with the lowest voltage. The method is simple, but the energy is only transmitted between the two battery cells with the highest voltage and the lowest voltage. , the equilibrium efficiency is low

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  • Battery pack active equalization method based on center drift clustering analysis
  • Battery pack active equalization method based on center drift clustering analysis
  • Battery pack active equalization method based on center drift clustering analysis

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Embodiment

[0036] combine figure 1 , figure 2 , an active balancing method for battery packs based on center drift cluster analysis, the method is used to optimize the consistency of electricity between single cells and optimize the performance of battery packs through active balancing, the method includes state of charge distribution estimation, based on center drift Cluster analysis, optimized clustering algorithm for different working conditions, and balanced end conditions based on consistency judgment.

[0037] SOC distribution estimation is based on the open circuit voltage (OCV) and state of charge (SOC) function relationship, that is, the OCV-SOC function curve, which is estimated and used as the initial value of SOC. When the system is running, the current is collected and the SOC is calculated using the ampere-hour integral method. If the system is static for more than 5 hours, the SOC is estimated from the OCV-SOC function curve as the initial value of SOC; if the system is ...

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Abstract

The invention discloses a battery pack active equalization method based on center drift clustering analysis. The battery pack active equalization method comprises the steps of charge state distribution estimation, clustering analysis based on center drift, clustering algorithm optimization for different working conditions and equalization ending conditions based on consistency judgment. The methodis suitable for a battery pack active equalization system, by controlling the uniform distribution of the SOC in an equalization manner, the consistency degree of each single battery in a battery pack is ensured, and the overall performance of the battery pack is optimized. The clustering analysis based on center drift ensures that the number of the single batteries needing to be equalized is minimum, meanwhile, ensures the effect of equalization ending consistency, and improves the efficiency of an equalization process. In consideration that the reasons limiting the performance of the battery pack under different working conditions are different, an objective function and as central point updating probability function are optimized in a targeted manner, the clustering process is simplified, and the improvement effect of equalization on the performance of the battery pack is optimized.

Description

technical field [0001] The invention belongs to the technical field of battery balancing, in particular to an active balancing method for battery packs based on center drift cluster analysis. Background technique [0002] Due to the limitation of the capacity of the battery cells, in order to meet the application requirements of large energy, it is necessary to connect a large number of battery cells in series and parallel to form a battery pack. Due to the difference in coulombic efficiency between battery cells, with the increase in the number of times the battery pack is used, there will be significant inconsistencies in the remaining capacity of each battery cell, which severely limits the available capacity of the battery pack during the overall charge and discharge process. Therefore, it is necessary to balance the single cells during the use of the battery pack to improve the performance of the battery pack. [0003] At present, there have been a lot of research on t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J7/00H01M10/44
CPCH02J7/0016H01M10/441Y02E60/10
Inventor 刘瑞航刘威唐传雨王天如孙金磊
Owner NANJING UNIV OF SCI & TECH
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