Battery equivalent circuit model

Abstract

The embodiment of the invention provides a battery equivalent circuit model. The model comprises a voltage source for representing open-circuit voltage of a battery, an electrochemical polarization analog circuit electrically connected with a positive pole of the voltage source, a concentration polarization analog circuit electrically connected with the electrochemical polarization analog circuitand the positive pole of the voltage output end, a first capacitor for representing the battery capacity, and an ohm internal resistance analog circuit electrically connected with the second end of the first capacitor and the negative oil of the voltage output end, wherein the first end of the first capacitor is electrically connected with the negative pole of the voltage source. The battery equivalent circuit model comprises various circuit structures capable of representing electric characteristics of a circuit inside the battery, can better simulate the battery characteristics, battery parameter changes in the battery charging process and the discharging process can be better represented, and the battery can be more precisely researched.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a battery equivalent circuit model. Background technique [0002] The battery equivalent circuit model refers to the use of solid-state electronic components, such as voltage sources (U OCV ), resistance, capacitance, etc., to characterize the model of the electrical characteristics of the internal circuit of the battery. The so-called "equivalent" does not mean that different circuits have the same effect, but refers to different representation methods of the same circuit. In the study of lithium batteries, the equivalent circuit model is currently the most widely used battery model because it can clearly express the external characteristics of the battery, and takes into account the factors affecting the voltage, current, and temperature of the battery. The mathematical expression is clear and clear. . However, in the equivalent circuit model in the prior art, the circuit s...

AI Technical Summary

Problems solved by technology

However, in the equivalent circuit model in the prior art, the circuit structure used to characterize the electrical characteristics of the internal circuit of the battery is relatively simple, and cannot simulate the characteristics of the battery well.

Images