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A method, device and equipment for evaluating the state of charge of a lithium battery

A state-of-charge and lithium-ion battery technology, which is applied in measurement devices, electricity measurement, and measurement of electric variables, etc., can solve the problems of large cumulative error and reduce the accuracy of battery state-of-charge estimation, and achieve the effect of improving accuracy.

Active Publication Date: 2022-07-19
STATE GRID E COMMERCE CO LTD
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Problems solved by technology

[0003] However, the applicant found that due to the current sampling error, the cumulative error of the state of charge will become larger and larger as time goes by, reducing the accuracy of battery state of charge estimation

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  • A method, device and equipment for evaluating the state of charge of a lithium battery
  • A method, device and equipment for evaluating the state of charge of a lithium battery
  • A method, device and equipment for evaluating the state of charge of a lithium battery

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Embodiment Construction

[0050]Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that the present disclosure will be more thoroughly understood, and will fully convey the scope of the present disclosure to those skilled in the art.

[0051] The state of charge of the battery described in the embodiment of the present invention refers to the ratio of the remaining battery capacity to the total rechargeable and dischargeable capacity of the battery, which can be calculated by the following formula:

[0052]

[0053] where SOC is the battery state of charge, Q remain is the remaining power of the battery, Q total is the total capacity of the battery.

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Abstract

An embodiment of the present invention provides a method for evaluating the state of charge of a lithium battery, including: acquiring actual operating state data of the lithium battery; comparing the actual operating state data with each open-circuit voltage-charge in a pre-established database The state parameters corresponding to the state curve are compared to determine the corresponding open-circuit voltage-state-of-charge curve when the operating state data matches the state parameters; according to the corresponding open-circuit voltage-state-of-charge curve, the state of charge of the lithium battery is determined. Embodiments of the present invention also provide an apparatus and device for evaluating the state of charge of a lithium battery. The curve cluster obtained by the evaluation method of the present invention can completely cover the operating characteristics of the battery under different working conditions, and the state of charge of the lithium battery is corrected based on this, so as to improve the accuracy of evaluating the state of charge of the lithium battery.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a method, device and equipment for evaluating the state of charge of a lithium battery. Background technique [0002] At present, with the increase of electric vehicles and energy storage applications, lithium batteries have been widely used. In order to give full play to the functions of lithium batteries and improve their safety, effective management of lithium batteries is required. The battery management system has become an important guarantee for the safe and efficient operation of the lithium battery. As an important state quantity of the lithium battery, the battery state of charge is one of the most important functions of the battery management system. The battery state of charge is an important parameter describing the remaining battery power, and it is of great significance to the reliable operation of the battery system. In electric vehicles, the state of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/367G01R31/388
Inventor 李松谢祥颖李洋那峙雄艾宇飞马大燕刘润彪周正韩蓄
Owner STATE GRID E COMMERCE CO LTD
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