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SOC adaptive correcting method for secondarily utilized battery

A self-adaptive battery technology, applied in the direction of measuring electricity, measuring electrical variables, instruments, etc., can solve the problems of battery capacity attenuation, poor consistency, and inaccurate battery SOC estimation, so as to improve accuracy, high reference value, and accurately target sexual effect

Active Publication Date: 2018-11-13
STATE GRID JIANGSU ELECTRIC POWER CO ELECTRIC POWER RES INST +3
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  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the deficiencies in the prior art, the present invention provides an SOC self-adaptive correction method for secondary utilization batteries, which solves the problem of inaccurate battery SOC estimation caused by battery capacity attenuation and poor consistency during secondary utilization of decommissioned batteries such as electric vehicles. question

Method used

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  • SOC adaptive correcting method for secondarily utilized battery
  • SOC adaptive correcting method for secondarily utilized battery
  • SOC adaptive correcting method for secondarily utilized battery

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Embodiment Construction

[0029] The present invention will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solution of the present invention more clearly, but not to limit the protection scope of the present invention.

[0030] Such as figure 1 As shown, a SOC adaptive correction method of a secondary utilization battery includes the following steps:

[0031] 1) Set the upper and lower limit protection values ​​of the operating voltage of the single battery according to the cut-off voltage recommended by the battery manufacturer, and modify the protection of the battery management system to the upper and lower limit protection of the operating voltage of the single battery; use the battery management system to monitor the battery operating process in real time, Record the battery operating data from the upper voltage limit to the lower voltage limit. The battery operating data includes the voltage of all single...

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Abstract

The invention discloses an SOC adaptive correcting method for a secondarily utilized battery. The SOC adaptive correcting method for the secondarily utilized battery comprises the following steps: 1)acquiring battery running data in a specific voltage range; 2) analyzing the battery running data, calculating available capacity Ca of a battery under discharging rate current Ia by using an ampere-hour integral method, and calculating equivalent available capacity C'a of the battery under standard current I0 according to a current-capacity curve of the battery; 3) calculating attenuation changerate of the available capacity of the battery, if the attenuation change rate is in a normal range, updating the available capacity C'0=C'a of the battery under the standard current I0, not updating the available capacity C'0=C'a of the battery if the attenuation change rate exceeds the normal range, and reporting abnormity and alarming; and 4) calculating a SOC correcting coefficient k by using the available capacity C'0 of the battery under the standard current I0 and initial available capacity, and updating the SOC correcting coefficient of the battery. The accuracy of SOC estimation of thebattery is improved.

Description

technical field [0001] The invention belongs to the technical field of battery SOC estimation, and in particular relates to an SOC self-adaptive correction method of a secondary utilization battery. Background technique [0002] The performance of the electric vehicle power battery decays with the increase in the number of uses, and it will no longer be suitable for continued use as a power battery. The decommissioned power battery still has considerable capacity and utilization value. The decommissioned battery can be applied to power through recycling, screening and reorganization. And energy storage application scenarios with low capacity performance requirements, such as data centers, backup power sources, energy storage power stations, etc., for secondary utilization of decommissioned power batteries. [0003] Battery specification concept: single cell, battery pack, battery pack, battery system, several single cells connected in series or parallel to form a battery pac...

Claims

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Application Information

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IPC IPC(8): G01R31/36
Inventor 吴盛军刘建坤袁晓冬周前汪成根李强费骏韬付慧
Owner STATE GRID JIANGSU ELECTRIC POWER CO ELECTRIC POWER RES INST
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