Lithium ion battery consistency screening and grouping method based on internal characteristics

A lithium-ion battery and grouping method technology, which is applied in the field of electric vehicle battery production and management, can solve problems such as poor screening and grouping methods, and achieve the effects of reducing inconsistency, improving safety, and extending service life

Active Publication Date: 2018-11-02
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention is to solve the problem that the existing lithium-ion battery screening and grouping method has poor effect

Method used

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  • Lithium ion battery consistency screening and grouping method based on internal characteristics
  • Lithium ion battery consistency screening and grouping method based on internal characteristics
  • Lithium ion battery consistency screening and grouping method based on internal characteristics

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specific Embodiment approach 1

[0020] Specific implementation mode one: refer to figure 1 value Figure 4 Specifically explain this embodiment, the lithium-ion battery consistency screening and grouping method based on internal characteristics described in this embodiment, the method includes the following steps:

[0021] The method comprises the steps of:

[0022] Step 1: Carry out parameter identification on the electrochemical model of the lithium-ion battery to obtain the electrochemical model parameters, select one of the parameters from the model parameters, and select multiple values ​​evenly within the variation range of the parameter value, and respectively select the parameter The corresponding multiple values ​​and other parameters are substituted into the electrochemical model of the lithium-ion battery for simulation, and multiple voltage curves corresponding to constant current discharge are obtained, and the sensitivity of the parameter is obtained according to the multiple voltage curves ob...

specific Embodiment approach 2

[0087] Specific embodiment 2: This embodiment is to further explain the lithium-ion battery consistency screening and grouping method based on internal characteristics described in specific embodiment 1. In this embodiment, in step 1, the sensitivity of each parameter is obtained. for:

[0088] From the multiple voltage curves obtained by each parameter, N time points are evenly selected, and each time point corresponds to multiple voltage values. Value and the voltage corresponding to a certain value of this parameter at a certain time point, the sensitivity of obtaining this parameter is:

[0089]

[0090] In the formula, σ j Represents the sensitivity of the jth model parameter of the battery, i represents the ith value of the model parameter within the range of ±10%, n represents the number of sampling points for the voltage curve family, the maximum value is N, V nij Indicates the battery terminal voltage corresponding to the i-th value of the j-th model parameter at...

specific Embodiment approach 3

[0091] Specific embodiment three: This embodiment is to further explain the lithium-ion battery consistency screening and grouping method based on internal characteristics described in specific embodiment one. In this embodiment, in step three, the coefficient of variation c v The acquisition process is:

[0092] Obtain the mean value and standard deviation of the parameter according to multiple values ​​corresponding to each parameter, and obtain the coefficient of variation c of the parameter according to the mean value of each parameter and the standard deviation of the parameter v for:

[0093]

[0094] In the formula, σ is the standard deviation of multiple values ​​of the same parameter, and μ is the average value of multiple values ​​of the same parameter.

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Abstract

The invention discloses a lithium ion battery consistency screening and grouping method based on internal characteristics, and relates to the field of electric car battery production and management application. The invention aims at solving a problem that a conventional lithium ion battery screening and grouping method is poor in effect. The method comprises the steps: carrying out the parameter recognition of an electrochemical model of a lithium ion battery, obtaining a plurality of voltage curves of the electrochemical model parameters, and obtaining the sensitivity of the parameter; selecting the parameters with high sensitivity from the plurality of parameters as an alternative feature vector; selecting the parameters with a high recognition degree from the plurality of parameters asan alternative feature vector; selecting the parameters with the sensitivity and recognition degree in the candidate feature vectors as the sensitive parameters; obtaining the fitting degree of the sensitive parameters of the battery; obtaining the weight of the feature parameter according to the sensitive parameter feature vector; correcting the sensitive parameter feature vector according to theweight, and obtaining a corrected matrix; obtaining the classification number of the battery and the grouping information of each battery cell according to the matrix and a clustering algorithm. Thismethod is used for grouping battery cells.

Description

technical field [0001] The invention relates to a lithium-ion battery consistency screening and grouping method based on internal characteristics, and belongs to the application field of electric vehicle battery production and management. Background technique [0002] The potential characteristics of the positive and negative materials of the battery determine that the rated voltage of the single battery is only about 3.7V, while the voltage required to drive an electric vehicle is several hundred volts. Therefore, the battery pack of an electric vehicle needs to be composed of multiple single batteries connected in series and parallel. Due to the current manufacturing process, there will be certain differences between individual cells, which will lead to differences in the performance of each cell. This difference from the manufacturing process is unavoidable. During the use of the battery pack, the performance difference of each battery cell will cause the failure of the ...

Claims

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Application Information

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IPC IPC(8): G01R31/36
Inventor 吕超宋彦孔刘恩会张禄禄李俊夫王立欣
Owner HARBIN INST OF TECH
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