Battery pack equilibrium method based on clustering analysis

An equalization method and cluster analysis technology, applied in battery circuit devices, secondary battery charging/discharging, secondary battery repair/maintenance, etc., can solve problems affecting the efficiency of the equalization method, low battery capacity, etc.

Active Publication Date: 2013-08-28
STATE GRID CORP OF CHINA +2
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  • Abstract
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Problems solved by technology

The defects of this method lie in the following points: 1. Different acquisition accuracy of the acquisition equipment will affect the judgment of the voltage difference; 2. Depending on the characteristics of the battery itself, such as technology, there is no proportional relationship between the voltage and the capacity, that is, the battery with high voltage may There is a phenomenon of low capacity; 3. The matching of the equalization method is to maintain the consistency of battery capacity, while the average voltage method is difficult to consider the impact of battery capacity decay, which seriously affects the efficiency of the equalization method

Method used

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  • Battery pack equilibrium method based on clustering analysis
  • Battery pack equilibrium method based on clustering analysis
  • Battery pack equilibrium method based on clustering analysis

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Embodiment Construction

[0044] The features and advantages of the present invention will be described in detail through examples, but the protection scope of the present invention is not limited thereto.

[0045] A battery pack equalization method based on cluster analysis, the battery pack is composed of several battery cells connected in series, comprising the steps of:

[0046] (1) For the battery pack for analysis, is the number of battery cells in the battery pack, and is an integer, and each battery unit is formed by connecting more than one single battery in parallel or in series;

[0047] (2) Analyze data; measure and select The voltage vol of a historical moment, It is an integer greater than or equal to 1, and the remaining capacity SOC and the state of health SOH at this moment are calculated, and combined with the rated capacity cap corresponding to each battery unit, the original data matrix is ​​obtained as follows:

[0048]

[0049] (3) For the original data matrix Per...

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Abstract

The invention provides a battery pack equilibrium method based on clustering analysis. A clustering analysis method is used for analyzing data such as voltages and internal resistance of each battery unit of battery packs in a time period in a clustering mode, the battery packs are classified, and meanwhile current information such as voltages and charging and discharging currents of batteries during equilibrium strategy judging is combined, so that the classified battery packs are further selected, finally battery units which need equilibrium charging and equilibrium discharging in the battery packs are obtained, and a charging and discharging loop is controlled to carry out equilibrium maintaining through an equilibrium module. According to the battery pack equilibrium method, history battery voltage data are introduced so that influence from voltage-abnormal batteries and voltage collecting accuracy can be effectively avoided, and meanwhile surplus capacity relevant factors such as SOC and SOH are combined, so that the phenomenon that the voltages and capacity are not in accordance is effectively avoided, the consistency of the battery packs is effectively guaranteed, and service life of the battery packs is further prolonged.

Description

technical field [0001] The invention relates to a method for equalizing a battery pack, in particular to a method for equalizing a battery pack based on cluster analysis. Background technique [0002] Due to different reasons such as production process and battery use in the battery pack, the capacity and performance of each battery are different. In the process of charging and discharging the battery pack, this difference will inevitably be enlarged; the capacity utilization rate of the battery pack will be lower and lower. If things go on like this, this vicious cycle process will accelerate the damage of the battery pack and shorten the service life of the battery pack. Therefore, it is the consensus of scholars and industries at home and abroad that the power battery pack needs to use a balancing circuit to prolong the life of the battery pack. [0003] Current equalization circuits and methods can generally be divided into lossy equalization and lossless equalization; ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J7/00H01M10/42H01M10/44
CPCY02E60/10
Inventor 伍发元吴三毛裴峰毛荣军张文华王浩刘爱华
Owner STATE GRID CORP OF CHINA
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