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Method for predicting cycle life of battery pack for electric car

A cycle life and prediction method technology, applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve the problem that the battery life prediction cannot be done on the battery pack, and achieve the effect of fast and effective cycle life performance and accelerated aging

Inactive Publication Date: 2015-06-17
CHERY AUTOMOBILE CO LTD
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AI Technical Summary

Problems solved by technology

In the above disclosed patents, the life prediction of the single battery is carried out. Since the electric vehicle battery pack is composed of hundreds or thousands of single cells, the factors affecting the life of the battery pack depend on the worst performance of the constituent units. single cell, so the simple single cell life prediction cannot be done on the battery pack

Method used

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  • Method for predicting cycle life of battery pack for electric car
  • Method for predicting cycle life of battery pack for electric car
  • Method for predicting cycle life of battery pack for electric car

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Embodiment Construction

[0010] Referring to the accompanying drawings, through the description of the embodiments, the specific embodiments of the present invention include the shape, structure, mutual position and connection relationship of each part, the function and working principle of each part, and the manufacturing process of the various components involved. And the method of operation and use, etc., are described in further detail to help those skilled in the art have a more complete, accurate and in-depth understanding of the inventive concepts and technical solutions of the present invention.

[0011] The invention provides a method for predicting the cycle life of a power battery pack of an electric vehicle, comprising the following steps:

[0012] Step 1: For a lithium-ion battery pack with a certain rated voltage (>300V), conduct a standard capacity test at room temperature (25±2°C):

[0013] The first step, 1 / 3C constant current discharge to the discharge cut-off voltage of the battery ...

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Abstract

The invention relates to a method for predicting the cycle life of a battery pack for an electric car. The method comprises the following steps: step I, carrying out standard capacity test on the battery pack at normal temperature, and recording a real standard capacity of the battery pack; step II, carrying out dynamic stress working condition circulating test on the battery pack, returning to the step I after multiple times of working condition circulating test is ended, recording the test times of the standard capacity, ending the circulating test at the temperature if the real capacity of the standard capacity test for continuous 4 to 6 times is less than 80 percent of the rated capacity, wherein the test times of the standard capacity indicate the cycle life of the battery pack; step III, repeating the step I and the step II, and testing the cycle life of the battery pack under multiple temperature points. According to the method, the battery pack cycle life data at the grouped time is collected, a fitted equation is obtained by virtue of data processing, and the cycle life of a lithium ion battery at present can be predicted.

Description

technical field [0001] The invention belongs to the technical field of electric vehicle battery systems, and in particular relates to a method for predicting the cycle life of a battery pack used in electric vehicles. Background technique [0002] With the development of social economy, the demand for energy is further increased, and the voice of new energy technology is getting higher and higher. Lithium-ion batteries have outstanding advantages such as high voltage, high energy density, good cycle performance, small self-discharge and no memory effect. , as a driving energy is widely used in the field of electric vehicles. [0003] Preliminary research on battery life has been carried out at home and abroad, and phased results have been achieved. For example: an accurate battery model based on differential equations; an analytical model based on diffusion theory, which can accurately predict the life of lithium-ion batteries for any given load. The current research on th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/36
Inventor 王建
Owner CHERY AUTOMOBILE CO LTD
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