A kind of SOH correction method and system of electric vehicle

An electric vehicle, correction value technology, applied in the direction of measuring electricity, measuring electrical variables, instruments, etc., can solve the problem of inaccurate SOH estimated value and so on

Active Publication Date: 2020-07-28
ANHUI JIANGHUAI AUTOMOBILE GRP CORP LTD
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Problems solved by technology

[0004] The invention provides an electric vehicle SOH correction method and system, which solves the problem of inaccurate SOH estimation values ​​of existing electric vehicles, and can improve the safety and intelligence of electric vehicles.

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  • A kind of SOH correction method and system of electric vehicle

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Embodiment Construction

[0040] In order to enable those skilled in the art to better understand the solutions of the embodiments of the present invention, the embodiments of the present invention will be further described in detail below in conjunction with the drawings and implementations.

[0041] Aiming at the problem of inaccurate valuation of power battery SOH in current electric vehicles, the present invention provides an electric vehicle SOH correction method and system, which adopts the setting of OCV-SOC correspondence table, and corrects the SOC value of power battery through OCV when conditions are met , and then correct the power battery SOH. Solving the problem of inaccurate SOH estimation of existing electric vehicles can improve the safety and intelligence of electric vehicles.

[0042] Such as figure 1 As shown, a SOH correction method for electric vehicles, including:

[0043] S1: Obtain the corresponding relationship between the open circuit voltage OCV of the vehicle power batter...

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Abstract

The invention provides an electric vehicle SOH correcting method and system. The method comprises testing the correspondence between the open circuit voltage (OCV) and the SOC (state of charge) of a vehicle power battery and establishing an OCV-SOC correspondence table of the vehicle power battery; after the vehicle power battery is fully charged in a slow charging mode and then charged and discharge, acquiring the accumulated discharging capacity C1 and the accumulated charging capacity C2 of the vehicle power battery; before the vehicle power battery is fully charged for another time, determining whether the vehicle power battery meets the conditions for correcting the battery SOC through the OCV; if so, acquiring the OCV of the vehicle power battery, searching for the corresponding SOCOCV correcting value from the OCV-SOC correspondence table, and correcting the SOH of the vehicle power battery according to the SOCOCV correcting value. The electric vehicle SOH correcting method canimprove the application safety and intelligence of electric vehicles.

Description

technical field [0001] The invention relates to the technical field of electric vehicle batteries, in particular to a SOH correction method and system for electric vehicles. Background technique [0002] As the capacity of the power battery of an electric vehicle continues to decline during use, the difference in the consistency of the battery gradually becomes larger, and the SOH value of the battery pack of a pure electric vehicle is also continuously attenuated. During the driving of electric vehicles, it is necessary to be able to estimate the state of health (SOH) of the battery pack in order to evaluate how much capacity the battery pack can be effectively utilized. If the accuracy of SOH is not high, the state of charge (SOC) of the battery will be inaccurate, and the estimation error of SOC is large, which may cause the electric vehicle to be forced to stop halfway due to insufficient power. [0003] At present, the mainstream SOH estimation method in the market is ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/392G01R31/387
Inventor 刘平姜点双徐爱琴赵久志李忠李申申
Owner ANHUI JIANGHUAI AUTOMOBILE GRP CORP LTD
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