Battery SOC correction method and device, battery management system
A kind of SOC and battery technology, applied in battery SOC correction method and device, battery management system field, can solve the problem of low estimation accuracy, achieve the effect of improving estimation accuracy, fast positioning, and simple voltage differential curve
Active Publication Date: 2021-06-08
JIANGSU CONTEMPORARY AMPEREX TECHNOLOGY LIMITED
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Problems solved by technology
[0003] At present, there are battery systems with multiple platforms (greater than or equal to 2) for the OCV (Open Circuit Voltage)-SOC curve. For example, there are 2 platform areas in the OCV-SOC curve of the lithium iron phosphate battery. The estimation accuracy is not high
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[0035] The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application.
[0036] The battery SOC correction method provided in the embodiment of the present application can be applied to an electric vehicle, and through this method, the SOC of the battery pack of the electric vehicle can be corrected.
[0037] Of course, this method can also be applied to other electric devices (that is, devices with a battery or a battery pack as a power source), and through this method, the SOC of the battery packs of other electric devices can be corrected.
[0038] Whether it is an electric vehicle or other electric equipment, it is usually equipped with a BMS (Battery Management System, battery management system). The BMS and the battery pack form a battery system. ) to manage. The hardware environment to which this embodiment of the present application applies may be a BMS correspo...
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The application provides a battery SOC correction method and device, and a battery management system; it relates to the technical field of batteries. Among them, the SOC correction method of the battery includes: obtaining the voltage-SOC variation curve of the battery during charging; generating the voltage differential curve of the battery according to the voltage-SOC variation curve; the voltage differential curve is the variation curve between the differential value and the SOC; the differential value is The ratio of the voltage variation to the SOC variation corresponding to the voltage variation during charging; determine the peak point on the voltage differential curve; the peak point is located between any adjacent two platforms of the voltage-SOC variation curve, and is not located at any On two adjacent platforms; perform SOC correction according to the peak point. This method is used to improve the estimation accuracy of SOC.
Description
technical field [0001] The present application relates to the technical field of batteries, in particular, to a battery SOC correction method and device, and a battery management system. Background technique [0002] SOC (State Of Charge) is used to reflect the remaining capacity of the battery. Its value is the ratio of the remaining capacity to the battery capacity. It is often expressed as a percentage, and its value ranges from 0 to 1. [0003] At present, there are battery systems with multiple platforms (greater than or equal to 2) for the OCV (Open Circuit Voltage)-SOC curve. For example, there are 2 platform areas in the OCV-SOC curve of the lithium iron phosphate battery. The estimation accuracy is not high. Contents of the invention [0004] The purpose of the present application is to provide a battery SOC correction method and device, and a battery management system to improve the estimation accuracy of the SOC. [0005] In the first aspect, the present appli...
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IPC IPC(8): G01R31/382G01R31/367G01R31/396H01M10/42
CPCG01R31/382G01R31/367G01R31/396H01M10/425H01M2010/4271H01M10/48H02J7/0048G01R31/3835G01R35/005
Inventor 黄珊李世超杜明树徐广玉
Owner JIANGSU CONTEMPORARY AMPEREX TECHNOLOGY LIMITED