Lithium battery physical model based on self-healing characteristics and charge/discharge monitoring system

Abstract

The invention provides a lithium battery physical model based on self-healing characteristics and a charge / discharge monitoring system. The model includes battery open-circuit voltage Uoc and batteryinternal resistance Ri, which includes discharge resistance Rdis and charge resistance Rch and is connected with RC network, a capacitor Cs and a resistor Rs in parallel. The open-circuit voltage Uocdescribes voltage characteristics of the battery and the capacitor Cs describes capacity characteristics of same. With LabView 2012 as a software development platform, the charge / discharge monitoringsystem includes a voltage collection card, a power supply module, a circuit collection module and a relay module and meanwhile includes three loops of a constant current charging circuit, a constant voltage charging circuit, and a discharge circuit. By means of the model, a voltage describing function after the discharge status is converted into a standing status of the battery can be acquired; the model, for different self-healing time, can accurate describe the voltage change situation of the battery under the standing status. Error between simulative values and measured values of the modelcan be maintained in a stable range. The model has excellent accuracy.

Description

technical field [0001] The invention relates to a lithium battery physical model and a charging and discharging monitoring system based on self-healing characteristics, belonging to the technical field of lithium battery modeling. Background technique [0002] In recent years, electric vehicles have received widespread attention and been vigorously promoted due to their clean and efficient features. However, power batteries have become an important factor affecting the performance and stability of electric vehicles. Lithium-ion batteries are small in size, light in weight, and low in self-discharge rate, making them one of the best choices for electric vehicle power batteries. Therefore, research on the safety and reliability of lithium-ion batteries has become the focus of attention. For example, the document "On-line State of Charge and State of Health Estimation Model for Lithium-ion Batteries" proposes to estimate the state of charge and state of health of the battery ...

AI Technical Summary

Problems solved by technology

The strength of self-healing is related to the time the battery is left undisturbed and will change as the number of times the battery is charged and discharged increases, affecting the remaining life of the battery

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