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Battery SOC (state of charge) correction method and device and battery SOH (state of health) estimation method

A battery and correction factor technology, applied in the field of battery SOH estimation, correction device, and battery SOC correction, can solve the problem that the battery management system cannot timely and accurately regulate the battery usage status, inaccurate, affecting battery life and safety, etc. problems, to achieve the effect of low computing power requirements, simple computing, and increase the safety of battery use

Active Publication Date: 2017-05-31
SUNWODA ELECTRONICS
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Problems solved by technology

[0004] The main purpose of the present invention is to provide a battery SOC correction method, which aims to solve the inaccurate application of the existing SOC estimation method to the battery use state, resulting in the battery management system not being able to timely and accurately regulate the battery use state and affecting the service life of the battery and security issues

Method used

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  • Battery SOC (state of charge) correction method and device and battery SOH (state of health) estimation method
  • Battery SOC (state of charge) correction method and device and battery SOH (state of health) estimation method
  • Battery SOC (state of charge) correction method and device and battery SOH (state of health) estimation method

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Embodiment Construction

[0037] It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0038] refer to figure 1 , the embodiment of the present invention proposes a battery SOC correction method, including:

[0039] S1: The battery management system matches the collected voltage value, current value and temperature value in the static state of the battery with the voltage value, current value and temperature value in the preset OCV curve table to find out the theoretical SOC value of the OCV state SOC o , and according to the current SOC value SOC P , get ΔSOC o ;

[0040] S2: According to the collected voltage value, current value and temperature value in the discharge state of the battery, match the voltage value, current value and temperature value in the preset EDV curve table to find out the EDV theoretical SOC value SOC e , and according to the current SOC value SOC p , get ΔSOC e ;

[0041...

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Abstract

The invention discloses a battery SOC (state of charge) correction method, comprising: matching, by a battery management system, acquired battery voltage, current and temperature values with preset OCV (open circuit voltage) curve table and EDV (end of discharge voltage) curve table to find out OCV state theoretical SOC value SOC<o> and EDV theoretical SOC value SOC<e>, and acquiring DeltaSOC<o> and DeltaSOC<e> according to current SOC value SOCP; comparing DeltaSOC<o> and DeltaSOC<e>, executing DeltaSOC<o> or DeltaSOC<e> to correct the SOC value in conjunction with standing time for triggering DeltaSOC<o> correction settings and voltage value for triggering DeltaSOC<e> correction settings, and determining a correction coefficient; using the correction coefficient as ampere-hour integral to calculate a variable factor of a battery real-time SOC variable, and smoothing a discharge curve so that SOC is gradually close to true value. The SOC correction method of the invention can estimate battery SOC more accurately.

Description

technical field [0001] The invention relates to the technical field of battery management, in particular to a battery SOC correction method, a correction device and a battery SOH estimation method. Background technique [0002] SOC is generally defined as the percentage of the battery's remaining power relative to the full charge. Correctly estimating the SOC of the battery can avoid damage to the battery of the electric vehicle when realizing vehicle energy management, rationally use the electric energy provided by the battery, and improve the utilization of the battery. rate, prolonging the service life of the battery pack. SOC estimation has its particularity, the temperature is different, the magnification is different, and the SOC point is different. The larger the discharge rate of the battery, the less electricity will be released; the working temperature of the battery is too high or too low, and the available capacity will be reduced; due to aging and self-discharg...

Claims

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Application Information

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IPC IPC(8): G01R31/36
CPCG01R31/387G01R31/392
Inventor 徐智慧易行云倪添翼
Owner SUNWODA ELECTRONICS
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