Cycle life testing method for power battery

A power battery and testing method technology, applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve the problems of power battery life, poor effectiveness, inaccurate test results, etc.

Active Publication Date: 2016-03-23
ANHUI JIANGHUAI AUTOMOBILE GRP CORP LTD
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Problems solved by technology

In order to study the life of the power battery, the test is generally carried out by the model method, specifically by setting extreme conditions, such as high current, high temperature, and low temperature, to conduct an accelerated life test on the battery, which is different from the situation when the power battery is installed in the operation of the electric vehicle Larger, the test result is inaccurate, and it is far from the actual power battery life, so the validity of the test is poor

Method used

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  • Cycle life testing method for power battery
  • Cycle life testing method for power battery
  • Cycle life testing method for power battery

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Embodiment Construction

[0058] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0059] Please refer to figure 1, in a specific embodiment, the power battery cycle life test method provided by the present invention is characterized in that it includes:

[0060] Step S1: Test the initial capacity value Q at a temperature of 25°C, charge at 0.5C, discharge at 1C, and discharge depth is 100%. 0 ;

[0061] Step S2: Test the temperature influence value f(T) of different temperatures T on the capacity fading rate;

[0062] Step S3: Test different charging current I 1 Influence value f of charging current on capacity fading rate 1 (I 1 );

[0063] Step S4: Test different discha...

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Abstract

The invention belongs to the technical field of automobile testing, and provides a cycle testing method for a power battery. The method comprises the steps: testing capacity initial values Q0 during the temperature 25 DEG C, 0.5C charging, 1C discharge and the discharge depth of 100%; testing a temperature impact value on a capacity attenuation rate from different temperatures, the charging current impact value on the capacity attenuation rate from different charging currents, the discharge current impact on the capacity attenuation rate from different discharging currents, and the discharge depth impact value on the capacity attenuation rate from different discharge depths; determining the capacity target value of the capacity attenuation of the power battery; building a model of the capacity attenuation of the power battery; and calculating the cycle number of the power battery during charging and the cycle number of the power battery during discharging. The method can accurately calculate the cycle life of the power battery of an electric car during operation through building power battery capacity attenuation rate models of different temperatures, charging currents, discharge currents, and discharge depths, and is high in testing effectiveness.

Description

technical field [0001] The invention belongs to the technical field of automobile testing, and in particular relates to a method for testing the cycle life of a power battery. Background technique [0002] Under the urgent needs of economic globalization and social energy conservation and emission reduction, the focus of the development of the world's automobile industry is shifting. At present, the development of new energy vehicles with the characteristics of environmental protection and energy saving has become a consensus in the automotive field, and electric vehicles are a common technology in this direction of development. An electric vehicle is a vehicle powered by a power battery. As an important part of an electric vehicle, the performance of the power battery will directly affect the development and application prospects of the electric vehicle. [0003] At present, the life of a power battery is an important performance indicator of a power battery, and it is gen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/36
CPCG01R31/382
Inventor 梁荣荣秦李伟夏顺礼赵久志庞艳红
Owner ANHUI JIANGHUAI AUTOMOBILE GRP CORP LTD
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