Power battery electric charge quantity estimation method

A technology of power battery and electric charge, applied in the direction of measuring electrical variables, measuring electricity, measuring devices, etc., can solve the problems of long time, increased estimation error, and increased estimation error.

Active Publication Date: 2014-03-26
GUILIN UNIV OF ELECTRONIC TECH
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Problems solved by technology

However, this method has the following problems: First, the complex Jacobian matrix needs to be calculated in the extended Kalman filter, which will increase the estimation time due to the complexity of the calculation process; secondly, the nonlinear function must be linearized, and the linearization process

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  • Power battery electric charge quantity estimation method
  • Power battery electric charge quantity estimation method
  • Power battery electric charge quantity estimation method

Examples

Experimental program
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Example Embodiment

[0087] The embodiment of the method for estimating the electric charge of the power battery,

[0088] The power battery is a lithium iron phosphate battery pack with a rated capacity of C 0 =60Ah.

[0089] Set the minimum operating current of the battery δ=(0.008~0.012)C, in this case δ=0.5(A).

[0090] According to the experimental results, set the resting time T=60 minutes for the battery to reach a stable open-circuit end voltage after charging or discharging.

[0091] Sampling period Δt=100ms

[0092] The process of this example is figure 1 As shown, including the following steps:

[0093] Ⅰ. Open circuit voltage method to obtain the function relationship between SOC and open circuit voltage

[0094] The open circuit voltage method in this example obtains the function relationship between SOC and open circuit voltage as figure 2 As shown, the battery is fully charged, and the rest time is T = 1 hour. After the open circuit voltage is stable, the open circuit voltage of the battery i...

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Abstract

The invention provides a power battery electric charge quantity estimation method. The method includes the following steps of firstly, obtaining the function relationship between the SOC and an open-circuit voltage through an open-circuit voltage method; secondly, measuring the initial value of the SOC; thirdly, sampling and obtaining the SOC estimated initial value of an unscented Kalman filter; fourthly, conducting Sigma point sampling of UT conversion of the unscented Kalman filter according to a battery state equation and an observation equation, obtaining an estimated value of the observation quantity, and estimating an SOC estimated value and a covariance of a power battery at the next moment. According to the method, the open-circuit voltage method and the unscented Kalman filter are used in cooperation for conducting SOC estimation, the estimation accuracy is high, the SOC initial value is obtained through the open-circuit voltage method, SOC estimation modification is conducted, the estimation accuracy is improved, and in the unscented Kalman filter non-linearization approximation process, errors are reduced, the calculation speed is high, and the SOC estimation efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of electric vehicle battery management, in particular to a method for estimating the electric charge of a power battery. Background technique [0002] The battery management system is a key component to realize the energy distribution of electric vehicles, and estimating the battery state of charge (SOC) in the battery management system is one of its key technologies. At present, the cruising range of electric vehicles is limited. During the driving process of electric vehicles, it is necessary to remind the driver of the current cruising range according to the remaining power of the battery in real time. In actual use, since the electric vehicle is in the process of starting, accelerating, constant speed, decelerating and parking, the current corresponding to the power battery is different, and the working characteristics of the power battery itself are highly nonlinear. The working environment of the uppe...

Claims

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Application Information

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IPC IPC(8): G01R31/36
Inventor 张向文周俊赵许勇党选举伍锡如莫太平潘明任风华
Owner GUILIN UNIV OF ELECTRONIC TECH
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