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On-line real-time identification method of parameters of battery equivalent circuit model

An equivalent circuit model and identification method technology, applied in the direction of measuring electricity, measuring electrical variables, instruments, etc., can solve the problems of offline identification limitation, difficulty of battery model parameters, and only applicable

Active Publication Date: 2022-07-05
枣庄职业学院
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The battery is a complex electrochemical-physical system with strong nonlinear and time-varying characteristics, which makes it extremely difficult to obtain the model parameters of the battery
Since the characteristics of the battery are affected by many factors such as temperature, battery state of charge (SOC) and battery life state (SOH), the offline identification method is subject to many restrictions and is only suitable for specific applications.
At present, there is no good method on how to construct real-time and online identification of battery model parameters applicable to any condition and any connection mode

Method used

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Embodiment 1

[0054] This embodiment discloses a method for on-line real-time identification of parameters of a battery equivalent circuit model. The method includes the following steps:

[0055] S01), establish a second-order equivalent circuit model of the battery, the second-order equivalent circuit model of the battery includes a series resistor R, a first RC module and a second RC module, and the first RC module includes a parallel resistor R p1 , capacitor C p1 , the second RC module consists of a parallel resistor R p2 , capacitor C p2 ;

[0056] S02), the second-order equivalent circuit model of the battery can be expressed by formula 1-3:

[0057] U=U o +RI+U p1 +U p2 (1),

[0058]

[0059]

[0060] Where U is the terminal voltage of the battery, I is the current, U o is the open circuit voltage, R is the ohmic resistance, C pi , R pi i=1, 2 are polarization capacitance and polarization internal resistance, respectively;

[0061] S03), convert formulas 1-3 into dif...

Embodiment 2

[0095] This embodiment discloses another method for identifying κ through parameter identification, and further obtaining the parameters of the second-order equivalent circuit model of the battery. The specific process is as follows:

[0096] b1), sample the voltage and current N times, and construct the matrix: Represents the data obtained for each sampling;

[0097] b2), construct matrix: Y=[y(3) y(4) ... y(N)] T , Y represents the measured terminal voltage of the battery;

[0098] b3), solve the equation to get the value of κ: κ=(Φ T Φ) -1 Φ T Y;

[0099] b4), calculate U according to formula 7 o , R, a i , b i and c i , i=1, 2;

[0100] b5), calculate C according to formula 5 pi and R pi , i=1,2.

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Abstract

The invention discloses an online real-time identification method for parameters of an equivalent model of a battery. The method first establishes a second-order equivalent circuit model of the battery, then uses a formula to describe the second-order equivalent circuit model of the battery, and then converts the formula into a differential method, and then obtain the parameters of the second-order equivalent circuit model of the battery through the parameter identification algorithm. The invention can identify the parameters of the second-order equivalent circuit model of the battery online and in real time, and then can realize various state estimation of the battery. The state of the battery includes but is not limited to SOC, SOP (power state) and SOH. The present invention can identify the parameters of the second-order equivalent circuit model of any type of battery, and the types of batteries include but are not limited to disposable batteries, lead-acid batteries, lithium polymer batteries, and the like.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to an online real-time identification method for parameters of an equivalent circuit model of a battery. Background technique [0002] The emergence of batteries has greatly promoted the popularization and practicality and lightness of electronic devices. In order to analyze the characteristics of the battery under certain conditions, it is necessary to simulate and analyze the battery according to the battery model. The battery is a complex electrochemical-physical system with strong nonlinear and time-varying characteristics, which makes it extremely difficult to obtain model parameters of the battery. Since the characteristics of the battery are affected by many factors such as temperature, battery state of charge (SOC), and battery state of life (SOH), the offline identification method is limited and only suitable for specific applications. At present, there is no good metho...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/388G01R31/392G01R31/367G01R31/396
CPCG01R31/388G01R31/392G01R31/367G01R31/396Y02E60/10
Inventor 王璐那娜王正君张永华李秋莹于洋
Owner 枣庄职业学院
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