Electric vehicle power battery state-of-energy estimation method

Abstract

The invention discloses an electric vehicle power battery state-of-energy (SOE) estimation method, and belongs to the technical field of electric vehicle battery management systems. According to the method, changes of battery voltage are considered in the estimation process, and the battery state and the vehicle driving range can be more comprehensively reflected compared with an existing battery state-of-charge (SOC) estimation method. The electric vehicle power battery state-of-energy estimation method is characterized by comprising the following steps of (1) initialization, wherein a system calculates an initial SOE value according to the current battery temperature, voltage, the state before standing and the standing time; (2) circulation, wherein the system corrects a battery balance electromotive force (EMF)-SOE relation curve and the battery rated energy by collecting the battery temperature, charging / discharging multiplying power and the recorded battery using frequency. On the basis of the principle of conservation of energy, the battery energy variable quantity is calculated, the initial SOE value is utilized for calculating the SOE value at the next moment, and continuous circulation is carried out so that the SOE value can be updated in real time.

Description

technical field [0001] The invention provides a method for estimating the energy state of a power battery of an electric vehicle, which belongs to the technical field of battery management systems for electric vehicles. Background technique [0002] With the global auto industry facing the huge challenges of the financial crisis and energy and environmental issues, there has been a broad international consensus on the development of electric vehicles, the electrification of automotive energy and power systems, and the promotion of the strategic transformation of the traditional auto industry. [0003] In the current field of electric vehicles, power batteries are one of the main energy storage power sources for electric vehicles. In order to ensure the efficiency and safety of power batteries, the research and development of battery management systems is particularly important. The power battery management system is used for real-time monitoring of the voltage, temperature,...

AI Technical Summary

Problems solved by technology

As the core technology in the battery management system, the SOC (State Of Charge) of the battery directly reflects the remaining battery capacity, but this definition based on the charge capacity ignores the voltage change of the battery during use, and The accuracy of SOC estimation is generally not high, and it cannot truly reflect the actual battery status and vehicle driving range.

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