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Method for estimating secondary cell SOH value and testing residual service life

A secondary battery and life testing technology, which is applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve the problems of insufficient prediction accuracy and applicability, and achieve the effect of improving the efficiency of use and maintenance and prolonging the use time

Inactive Publication Date: 2013-09-18
NAT UNIV OF DEFENSE TECH
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Problems solved by technology

The existing secondary battery life prediction methods, whether based on life data or performance degradation data, are generally proposed under the assumption that the secondary battery is always in the working state or storage state, and the stress profile is given. Its prediction accuracy and applicability are very insufficient

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  • Method for estimating secondary cell SOH value and testing residual service life

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Embodiment Construction

[0014] refer to figure 1 , the specific embodiment adopts the following technical scheme: its prediction method includes the following steps: (1) using sensors such as temperature, voltage, current, humidity, salt spray, vibration, resistance, etc. to collect the performance degradation covariate data of the secondary battery in real time; (2) Use the real-time collected secondary battery performance degradation covariate data to establish the secondary battery degradation covariate state process model and estimate the model parameters in real time; (3) Use the real-time collected secondary battery performance degradation covariate data to analyze and calculate the secondary battery The maximum usable capacity, maximum energy, maximum output power, internal resistance and other degradation values ​​of the battery; (4) Use the real-time calculation results of the performance degradation of the secondary battery and the battery factory data (rated capacity, rated energy, charge c...

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Abstract

The invention provides a method for estimating a secondary cell SOH value and testing the residual service life and relates to a method for predicting the residual service life of a secondary cell. The predicting method comprises the following steps of acquiring performance degradation concomitant variable data of the secondary cell in real time, establishing a secondary cell degradation concomitant variable state process model and estimating model parameters in real time, calculating a degradation quantity value of the secondary cell, calculating a result and cell ex-factory data in real time, estimating a current SOH value of the secondary cell in real time, establishing a secondary cell stress-degradation united model and estimating model parameters, and calculating the residual service life of the secondary cell under different using conditions according to preset using standards of the secondary cell in real time. By means of the method for estimating the secondary cell SOH value and testing the residual service life, the accuracy and the reliability of health status SOH estimation and residual service life prediction of the secondary cell can be improved, the using and maintenance efficiency of the cell is improved, and the service life of the cell is prolonged.

Description

Technical field: [0001] The invention relates to a method for predicting the remaining life of a secondary battery, in particular to a method for predicting the remaining cycle life and remaining calendar life of a secondary battery based on degraded covariates. Background technique: [0002] Secondary batteries are key components of products such as electric vehicles, communication base stations, mobile phones, and notebook computers. The accuracy of their remaining life prediction will directly affect the cost and performance of such products. The secondary battery has two obvious characteristics in the application: (1) non-continuous operation, the state of standing and charging and discharging alternately appears; A variable that is relevant and can be monitored directly or indirectly is the performance degradation covariate. According to the relationship with the degradation of secondary battery performance, the degradation covariates are divided into environmental cov...

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Application Information

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IPC IPC(8): G01R31/36
Inventor 孙权冯静潘正强颜兆林程龙
Owner NAT UNIV OF DEFENSE TECH
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