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Battery pack cycle test consistency analysis method

A technology of cyclic testing and analysis methods, applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve the problems of inaccuracy, not considering the state of charge, etc., to achieve the effect of getting rid of rummaging data and drawing smoothly

Active Publication Date: 2018-10-19
TIANJIN ENERGIES
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Problems solved by technology

[0003] The existing battery pack cell consistency analysis methods mostly use fixed voltage difference or voltage distribution extreme difference to formulate the consistency index of the battery pack, which does not take into account the voltage difference between the single cell in the battery pack and its battery pack. The correlation between the state of charge (State of Charge, SOC) value has the disadvantage of inaccuracy

Method used

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Embodiment Construction

[0026] Such as figure 1 As shown, the workflow of the battery pack cycle test consistency analysis system includes:

[0027] 1. The data storage unit records the test data of the battery pack according to the preset time interval and format.

[0028] 2. Read the test data file, read all the data according to the meaning of each data column configured in advance, and load the data into the system memory for subsequent system analysis of product consistency and drawing of voltage trend diagrams.

[0029] 3. Determine the charging and discharging process. There are two ways to identify the charge and discharge state of the battery pack: current method and voltage method. In the case of current records, the current charging and discharging state of the product can be distinguished through the change of current data. In a static state, the current value is 0 or a very small absolute value; when charging or discharging, the current value is positive or negative. In the absence o...

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Abstract

A battery pack cycle test consistency analysis system is designed based on a battery pack cycle test consistency analysis method. The system comprises a reference voltage difference calculation unit,a data storage unit, a data reading unit, a data calculation unit and a drawing unit. The reference voltage difference calculating unit is used for calculating a reference voltage difference requiredby different battery packs in consistency analysis. The data storage unit is used for recording test data of the battery packs according to a preset time interval and format. The data storage unit isused for reading the recorded data. The data calculation unit is used for calculating the voltage difference of a single battery in the battery packs and comparing the voltage difference with a reference voltage difference to obtain a consistent conclusion. The drawing unit is used for drawing a single voltage distribution curve. A fixed SOC difference allowable range is used, and the dynamic consistent of the battery packs can be more accurately reflected dynamically formulating the voltage difference range of each SOC.

Description

technical field [0001] The invention relates to the field of battery pack testing, in particular to a consistency analysis method for a battery pack cycle test. Background technique [0002] With the popularity of electric vehicle applications and the rapid increase in market share, the production and demand of battery packs have also increased rapidly. The consistency of each single battery that makes up the battery pack largely determines the cruising range of the vehicle and the service life of the system. Therefore, in the shipping standard of the battery pack, there are requirements for the consistency between the battery cells during the charging and discharging process of the battery pack, and the battery manufacturer needs to conduct a consistency analysis on the cycle test data of the battery pack. [0003] The existing battery pack cell consistency analysis methods mostly use fixed voltage difference or voltage distribution extreme difference to formulate the cons...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/36
Inventor 张福生
Owner TIANJIN ENERGIES
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