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A system and method for estimating cycle life of electric vehicle battery

A technology for battery cycle and life estimation. It is applied in the direction of measuring electricity, measuring electrical variables, instruments, etc. It can solve the problems of inapplicability to the actual working conditions of the whole vehicle and long research and development cycle, so as to meet the subjective needs, shorten the development cycle, and improve the estimation. precise effect

Active Publication Date: 2021-02-26
奇瑞新能源汽车股份有限公司
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Problems solved by technology

[0004] The invention provides a battery cycle life estimation system for electric vehicles, aiming to solve the problem that the existing cycle life estimation system has a long research and development period and is not suitable for the actual working conditions of the whole vehicle

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  • A system and method for estimating cycle life of electric vehicle battery

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Embodiment Construction

[0029] The specific implementation manner of the present invention will be described in further detail below by describing the best embodiment with reference to the accompanying drawings.

[0030] In an embodiment of the present invention, the electric vehicle battery cycle life estimation system includes:

[0031] The battery management system, the hall sensor connected with the battery management system, the hall sensor is set on the busbar of the battery pack;

[0032] When the vehicle is powered on (corresponding to discharge mode) or the charger sends out an ignition signal (corresponding to charging mode), the battery management system is awakened, and the battery management system wakes up the Hall sensor, which is used to detect the bus current of the power battery pack , the current can be charging current or discharging current, and the detected current value is sent to the battery management system, and the battery management system calculates the cycle life SOH of ...

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Abstract

The present invention relates to the technical field of power batteries, and provides a system and method for estimating the battery cycle life of an electric vehicle. The method includes: reading the current battery capacity C of the power battery when the vehicle is powered on or the charger sends out an ignition signal 0 ; When the open circuit voltage reaches the interval end value of the OCV interval, record the battery capacity Cv under the OCV interval; calculate the difference between the battery capacity Cv and the median value of the battery capacity stored in the corresponding OCV interval, if the difference is less than the first preset difference, the current battery capacity Cv is stored as a sample in the battery capacity sample set corresponding to the corresponding OCV interval; the maximum capacitance, the minimum capacitance and the median value of the current OCV interval are updated, and the arithmetic calculation of the capacitance of the current OCV interval Average value; calculate the cycle life SOH of the power battery, and update the display. Break the shackles of battery cycle life estimation based on the experimental data of 1000 battery charge and discharge cycles, the development cycle is short, and it is closer to the actual development needs of the project.

Description

technical field [0001] The invention relates to the technical field of power batteries, and provides a system and method for estimating cycle life of electric vehicle batteries. Background technique [0002] The battery cycle life estimation system (SOH) of an electric vehicle is the basis of the remaining battery capacity estimation system (SOC). The accuracy of the SOH determines the accuracy of the SOC, and the estimation of the cruising range of the vehicle is based on the SOC, so the accuracy of the SOH directly affects The accuracy of vehicle mileage estimation affects the driver's subjective driving experience. [0003] The traditional SOH of electric vehicles is based on the test data of 1000 battery cycle tests, and the SOH is obtained by summarizing the linear empirical formula. This traditional solution requires more than three years of cycle tests on the one hand, far exceeding the entire development cycle of an electric vehicle. ; On the other hand, the empiric...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/396G01R31/392
CPCG01R31/392G01R31/396
Inventor 黄芳芳宋开通曾祥兵朱晓东黄园园吴亚东
Owner 奇瑞新能源汽车股份有限公司
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