Battery state of charge soc calibration method and system
A technology of state of charge and calibration method, applied in the direction of measuring electricity, measuring electrical variables, instruments, etc., can solve the problems of low precision and low frequency, and achieve the effect of increasing the frequency of calibration, shortening time, and improving accuracy
Active Publication Date: 2022-07-01
CHINA ELECTRIC POWER RES INST +1
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Problems solved by technology
SOC in current integration method by open circuit voltage method 0 Calibration, but this method requires the battery to stand for a long enough time, usually more than 3 hours, resulting in SOC 0 The calibration frequency is low, and in the open circuit voltage method, a single OCV-SOC curve is used, and the accuracy is not high
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[0065] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.
[0066] A method for calibrating the state of charge (SOC) of a battery, comprising the following steps:
[0067] A: Detect battery rest time.
[0068] B: Determine whether the battery resting time exceeds the preset limit; if it exceeds, execute the next operation; if not, return to step A; the range of the preset limit is 4 to 20 minutes, preferably, all The preset limit is 5 minutes.
[0069] C: According to the current parameter conditions of the battery, find the matching U-SOC curve from the database, where the U-SOC curve is a curve reflecting the relationship between the battery terminal voltage and the state of charge, which is obtained through offline measurement and pre-stor...
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The present invention provides a battery state-of-charge SOC calibration method and system, wherein the calibration method includes the following steps: A: detecting the battery resting time; B: judging whether the battery resting time exceeds a preset limit; Execute the next step; if it does not exceed, return to step A; C: According to the current parameter conditions of the battery, find the matching U-SOC curve from the database; D: According to the terminal voltage after the battery resting time, in Find the corresponding SOC in the U-SOC curve obtained in step C; E: correct the system SOC according to the SOC obtained in step D. The method for calibrating the state of charge SOC of the battery provided by the invention selects an appropriate U-SOC curve for calibration according to the current working conditions, which improves the accuracy, shortens the time required for calibration, and increases the frequency of calibration.
Description
technical field [0001] The invention relates to the technical field of battery calibration, in particular to a battery state of charge SOC calibration method and system. 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, they must be effectively managed. BMS (Battery Management System, battery management system) system) has become an important guarantee for the safe and efficient operation of lithium batteries. SOC (State of Charge, state of charge) is one of the most important parameters in BMS, and other states of the battery are mostly based on SOC. The SOC of a lithium battery directly reflects the remaining available capacity of the lithium battery and is an important indicator for evaluating the performance and state of the lithium battery. In an electric vehicle, by accurate...
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IPC IPC(8): G01R31/367G01R31/388
CPCG01R31/3648
Inventor 侯朝勇田野王兆军程法民解玖霞陈娟李松渠展展汪奂伶许守平杨水丽惠东
Owner CHINA ELECTRIC POWER RES INST