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Battery state-of-charge estimation method based on open-circuit voltage calibration

A technology of battery state of charge and open circuit voltage, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve the problems of complexity, high control cost, accumulated error, etc., to achieve low complexity requirements, high estimation accuracy, easy to use effect achieved

Active Publication Date: 2021-06-22
FUZHOU UNIV
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Problems solved by technology

However, the above method is extremely complicated, and its high control cost is not conducive to direct application in the industrial field
In addition, the accuracy of the ampere-hour integration method is limited by the measurement accuracy of the sensor, and accumulated errors will occur during use, resulting in a gradual decrease in the estimation accuracy of the SOC, making it impossible to accurately obtain the battery SOC

Method used

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  • Battery state-of-charge estimation method based on open-circuit voltage calibration
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  • Battery state-of-charge estimation method based on open-circuit voltage calibration

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Embodiment Construction

[0038] In order to demonstrate the content and characteristics of the present invention more clearly, the specific implementation process of the method for estimating the state of charge of a battery based on open-circuit voltage calibration will be described below in conjunction with the drawings and technical solutions. The invention can be realized in different forms and should not be limited to the embodiments described.

[0039]A battery state-of-charge estimation method based on open-circuit voltage calibration proposed in this embodiment, its realization principle is as follows figure 1 As shown, the test system consists of battery charge and discharge tester, battery ECM and feedback correction controller. Specific working process: first initialize the initial value of the battery SOC, and then the feedback correction controller adjusts the input current of the battery ECM in real time according to the difference between the terminal voltage output by the battery ECM a...

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Abstract

The invention relates to a battery state-of-charge estimation method based on open-circuit voltage calibration, and the method comprises the steps: taking a difference value between a terminal voltage of a battery equivalent circuit model and an actual battery terminal voltage as the input of a feedback correction controller, and regulating and controlling the working state of the battery equivalent circuit model through a current value outputted by the feedback correction controller; and enabling the terminal voltage of the battery equivalent circuit model to change along with the actual battery terminal voltage in real time, thereby continuously calibrating the open-circuit voltage of the battery equivalent circuit model, and obtaining an actual battery state-of-charge estimation value. The method is high in estimation precision, simple, feasible and easy to implement.

Description

technical field [0001] The invention belongs to the field of electric vehicle battery management systems, and in particular relates to a method for estimating the state of charge of a battery based on open-circuit voltage calibration. Background technique [0002] The battery pack is an important part of a pure electric vehicle, usually consisting of hundreds or thousands of single cells. However, during the operation of electric vehicles, the difference in state-of-charge (SOC) of the battery causes a significant decline in the life and capacity of the battery pack, which in turn makes the cost and performance of electric vehicles unable to meet the use requirements. In addition, battery SOC estimation is the decision-making basis for the battery management system (Battery-Management-System, referred to as BMS) to implement management and formulate control commands, directly reflecting the remaining mileage of electric vehicles. Therefore, accurate and efficient estimation...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/388G01R31/367
CPCG01R31/388G01R31/367
Inventor 王亚雄钟浩杨庆伟
Owner FUZHOU UNIV
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