A method and device for determining SOC based on a steady-state equivalent circuit model

Abstract

An embodiment of the present invention provides a method and device for determining SOC based on a steady-state equivalent circuit model. The method includes: obtaining the current charging / discharging current, current steady-state Voltage and current operating temperature; based on the current charge / discharge current and current operating temperature, determine the corresponding steady-state voltage under different SOCs from the steady-state equivalent circuit model database corresponding to the target battery; based on the current steady-state voltage and the corresponding Steady-state voltage relationship to determine the current SOC of the target battery. By using the steady-state equivalent circuit model database, find the steady-state voltage under different SOCs corresponding to the current charge / discharge current and current operating temperature in the steady state of the target battery, and compare the current steady-state voltage with the steady-state voltage under different SOCs The size of the voltage determines the current SOC of the target battery. The overall scheme has the advantages of small calculation amount, high precision and easy implementation.

Description

Technical field [0001] The present invention relates to the field of battery technology, particularly relates to a method and apparatus for determining the SOC based on the steady state equivalent circuit model. Background technique [0002] SOC as an important parameter of the electric vehicle is running, it is particularly important to accurately estimate the battery management system functions, such as overcharge and over-discharge protection, power balancing, fault detection, etc. are dependent on the SOC predicted, but not directly measured SOC the physical must be obtained by experiment or estimates. Currently, there are proposed various methods of estimating SOC, as the discharge experiment, resistance method, the open circuit voltage of the test method, the current integration method, neural network method, the Kalman filter method or the like. [0003] However, these conventional methods, the discharge test method can not be an actual car, resistance method requires resi...

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Problems solved by technology

[0004] In view of this, the embodiment of the present invention provides a method and device for determining SOC based on a steady-state equivalent circuit model to overcome the problem in the prior art that it is difficult to conveniently and accurately determine the SOC of a battery in a real vehicle under working conditions

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