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Assessment method and device for consistency of power battery pack

A power battery pack and consistency technology, which is applied in the direction of measuring devices, secondary battery repair/maintenance, and electrical measurement, can solve problems such as the one-sidedness of power battery pack consistency evaluation, and achieve reliable technical support, comprehensive factors, and evaluation results. accurate effect

Active Publication Date: 2014-01-15
STATE GRID CORP OF CHINA +2
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  • Abstract
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Problems solved by technology

[0006] The main purpose of the present invention is to provide a power battery pack consistency evaluation method and device to solve the problem of one-sidedness in the power battery pack consistency evaluation in the prior art

Method used

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  • Assessment method and device for consistency of power battery pack
  • Assessment method and device for consistency of power battery pack
  • Assessment method and device for consistency of power battery pack

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Embodiment Construction

[0038] It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and examples.

[0039] First, the specific implementation of the power battery pack consistency evaluation method is introduced.

[0040] figure 1 is a flowchart of a power battery pack consistency evaluation method according to an embodiment of the present invention, see figure 1 As shown, the method mainly includes the following steps:

[0041] Step S11: Calculate the capacity dispersion, equivalent DC internal resistance dispersion and voltage platform dispersion of the power battery pack according to the characteristic parameters of the power battery pack, where the power battery pack includes n single cells, and the characteristics of the power battery pack The parameters include the current of the bat...

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Abstract

Provided in the present invention are a method and apparatus for evaluating the consistency of a power battery pack, applicable in solving the problem of partiality in evaluating the consistency of individual batteries in a power battery pack. The method comprises: calculating a capacity dispersion, an equivalent direct current resistance dispersion, and a voltage platform dispersion of the power battery pack on the basis of a characteristic parameter of the power battery pack; by using a predetermined evaluation weight value, calculating a weighted average of the dispersions to acquire a comprehensive evaluation factor of the power battery pack; and acquiring a comprehensive evaluation result of the power battery pack on the basis of the comprehensive evaluation factor, where the greater the comprehensive evaluation factor, the poorer the consistency of the power battery pack. Employment of the technical solution of the present invention allows for comprehensive evaluation of the consistency of the power battery pack, thus allowing for the acquisition of an accurate evaluation result, facilitating the completion of a comprehensive performance evaluation of battery packs, and providing the application of power batteries with reliable technical support. The present invention is funded by Task 2011AA05A109 of the National High-tech Research and Development Program (863 Program).

Description

technical field [0001] The invention relates to the field of power batteries, in particular to a method and device for evaluating the consistency of a power battery pack. Background technique [0002] With the development of power battery material technology and the popularization and application in the field of electric vehicles, the energy density, power density and cycle life of single batteries have been greatly improved. Differences. After the power batteries are connected in series and parallel, there will be inconsistencies in the single cells, which will reduce the overall performance of the entire battery pack. During use, due to the difference in the consistency of the single cells, the performance of the power battery pack will be accelerated. Attenuation And the overall service life is shortened, and the electrical output characteristics (capacity characteristics, rate characteristics, etc.) of the power battery pack will be affected to varying degrees, making it...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/36
CPCY02E60/12G01R31/3679H01M10/42G01R31/392Y02E60/10Y02P70/50
Inventor 张昌斌王鹏李华春常晓旗温家鹏刘军冯韬
Owner STATE GRID CORP OF CHINA
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