Power output feasible region estimation method based on lithium ion battery electrochemical model

Abstract

The invention provides a power output feasible region estimation method based on a lithium ion battery electrochemical model. The method comprises the following steps: S1, acquiring a battery environment temperature and an initial charge state; s2, obtaining battery state information, and obtaining a battery simulation result at each moment in a preset time period according to the battery state information and lithium ion battery electrochemical model simulation; s3, taking a battery simulation result as a constraint condition, performing iterative optimization on the simulation process in the step S2, and obtaining a maximum feasible current value of a battery port in a preset time period; s4, simulating and calculating a battery port voltage curve according to the maximum feasible current value to obtain a maximum power output feasible value corresponding to the battery environment temperature and the initial state of charge; and S5, adjusting the battery environment temperature and the initial charge state, and repeating the steps S1 to S4 to obtain the power output feasible region of the lithium ion battery. According to the invention, the current feasible output power of the battery can be estimated more accurately and effectively.

Description

technical field [0001] The present application relates to the technical field of lithium-ion battery power output feasible domain estimation, and in particular, to a power output feasible domain estimation method and device based on an electrochemical model of a lithium-ion battery. Background technique [0002] In recent years, lithium-ion batteries have been widely used in electric vehicles, power systems and other scenarios as an energy storage medium. In order to meet the economical, efficient and safe operation requirements of lithium-ion batteries, it is necessary to establish an accurate and objective description of the power output feasible region of lithium-ion batteries, so that it has the ability to describe the available output of lithium-ion batteries in power scenarios, and based on The feasible area of ​​power output proposes a scientific and efficient energy management strategy for practical application of lithium-ion batteries. In the problem of estimating ...

AI Technical Summary

Problems solved by technology

[0005] For this reason, the first purpose of this application is to propose a method for estimating the feasible range of power output based on the electrochemical model of lithium-ion batteries, which solves the problem that the existing method is difficult to accurately estimate the feasible range of power output of lithium-ion batteries, and can be more comprehensive It accurately reflects the influence of the internal state constraints of the battery on the feasible output power, and at the same time completely retains the operating characteristics of the lithium-ion battery under different sampling frequencies in the long and short periods of time, and realizes more accurate and effective monitoring according to the operating state of the lithium-ion battery. The purpose of estimating the feasible output power of the current battery is to provide technical support for the economical, efficient and safe operation of lithium-ion batteries, which has important practical significance and good application prospects

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