Method for predicting life of new energy vehicle battery system

A new energy vehicle and battery system technology, which is applied in the field of life prediction of the new energy vehicle battery system, can solve the problems of complex service life prediction methods and inability to accurately obtain the attenuation state of the vehicle battery system, and achieve accurate prediction results

Inactive Publication Date: 2017-10-20
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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Problems solved by technology

However, at present, the methods for predicting the service life of the vehicle battery system are relat

Method used

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Example Embodiment

[0017] A method for predicting the life of the battery system of a new energy vehicle includes the following steps:

[0018] S1: Test the calendar life capacity decay of the battery at different temperatures and different SOC states, and establish the capacity decay rate-time database under various conditions;

[0019] For example, test the calendar life capacity decay of the battery in the 0%, 30%, 50%, 80%, 100% SOC state at 25°C, 40°C, and process the data under each condition to obtain the respective conditions. The capacity decay rate-time database;

[0020] S2: Test the cycle life of the battery at 25°C and 40°C, and establish the capacity decay rate-cycle number database;

[0021] S3: Analyze the operating data of the vehicle, and obtain the actual application temperature range of the battery during the vehicle operation as the distribution ratio α at different temperatures T1 , Α T2 ……;, the temperature range of the actual application of the battery and the distribution ratio ...

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Abstract

The invention relates to a method for predicting a life of a new energy vehicle battery system. The method comprises a step of establishing a capacity attenuation rate-time database and capacity attenuation rate-cyclic number database under each condition, a step of analyzing the operation data of a vehicle, and obtaining a temperature range of a battery practical application in vehicle operation and shelf processes, a distribution ratio in different temperatures and different SOC proportions in a vehicle shelf process, a step of calculating attenuation rates of a battery corresponding to cyclic numbers under different temperatures in the vehicle operation process and attenuation rates corresponding to times under different temperatures and times occupied by different SOC in the vehicle shelf process, and a step of calculating a battery system total attenuation rate. According to the method, important conditions of each single electric core, mutual relation, an electric core using condition and the like in the battery system are comprehensively considered, a relation between a theoretical test and practical application is established, and the life attenuation of the whole vehicle battery system can be accurately predicted.

Description

technical field [0001] The invention relates to the field of new energy vehicles, in particular to a method for life prediction of a battery system of a new energy vehicle. Background technique [0002] 2015 is known as the first year of new energy vehicles. In the past two years, new energy vehicles have developed rapidly. Among all parts of new energy vehicles, the battery system is the most important and core component, which directly determines the service life of new energy vehicles. The service life of the battery system largely depends on the service life of the single battery cell, and is also affected by the use conditions such as the use temperature and SOC state. However, at present, the methods for predicting the service life of the vehicle battery system are relatively complicated, and the attenuation state of the vehicle battery system cannot be accurately obtained. Contents of the invention [0003] The purpose of the present invention is to provide a meth...

Claims

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Application Information

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IPC IPC(8): G01R31/36
CPCG01R31/367G01R31/392
Inventor 荆孟娜张传明厉运杰
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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