SOC estimation method for power battery

A power battery and dynamic technology, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve problems such as errors and large errors, and achieve the effect of eliminating calculation errors

Active Publication Date: 2019-09-17
ANHUI UNIVERSITY
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Problems solved by technology

This will lead to different degrees of error in the estimation of SOC under different discharge environments and different discharge conditions, especially in the case of extreme temperature or severe current fluctuations, the error is greater

Method used

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  • SOC estimation method for power battery
  • SOC estimation method for power battery
  • SOC estimation method for power battery

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Embodiment Construction

[0044] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0045] Such as figure 1 As shown, this embodiment provides a power battery SOC estimation method, including the following steps:

[0046] Step A: Reference figure 2 , discharge the power battery at different current intensities, and obtain the relationship between the total capacity of the power battery and the discharge current intensity;

[0047] The relationship between the total capacity of the power battery and the intensity of the discharge current is:

[0048]

[0049] in, Indicates the total capacity of the power battery when the discharge current is i, β x x∈[1,n] and are constants.

[0050] Carry out full-discharge experiments on the power battery with multiple sets of constant discharge currents, and...

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Abstract

The invention provides a SOC estimation method for a power battery, and the method comprises the following steps of A, discharging the power battery under different current intensities, and obtaining a relationship between the capacity of the power battery and the current intensities; B, discharging the power battery under a constant current, and obtaining a steady-state open circuit voltage of the power battery to obtain the relationship between the SOC value and the steady-state open circuit voltage; C, simulating the SOC consumption of the vehicle driven by the power battery at different accelerations and acceleration times by using a simulation test bench; D, introducing a sigmoid function and a dynamic capacity chronograph integration algorithm to calculate the SOC consumption, and calculating parameters of the sigmoid function by the SOC consumption obtained in the step C; and E, calibrating the parameter relationship of the sigmoid function under different accelerations to obtain a sigmoid function related to the accelerations, and introducing the dynamic capacity and sigmoid function on the traditional ampere-time integration algorithm to obtain the calculation formula of the SOC. The SOC estimation method for the power battery provided by the invention reduces the calculation amount of the algorithm while improving the estimation accuracy of the SOC.

Description

technical field [0001] The invention relates to the technical field of battery management for new energy vehicles, in particular to a method for estimating the SOC of a power battery. Background technique [0002] The rapid development of the automobile industry has led to a sharp increase in the global consumption of non-renewable energy such as coal, oil, and natural gas. The huge consumption of traditional fuels has not only accelerated the depletion of global energy, but also brought great damage to the global environment. The deteriorating environmental problems and energy crisis force the automobile industry to develop in a clean, efficient and sustainable direction. [0003] In recent years, with the continuous deepening of people's environmental protection concept and the successful application of electric drive vehicles, electric vehicles (Electric Vehicles) driven by pure electric vehicles have developed rapidly. With its advantages of energy saving, zero emission...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/367
CPCG01R31/367
Inventor 潘天红靳博文陈山
Owner ANHUI UNIVERSITY
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