Online estimation method for direct current resistance of power battery of electric vehicle

A power battery pack and DC impedance technology, which is applied in the direction of measuring resistance/reactance/impedance, measuring current/voltage, measuring electrical variables, etc., can solve the problem of reducing the accuracy of state parameter estimation, not considering time-varying parameters, and predicting power battery packs Problems such as DC internal resistance and open circuit voltage, etc., to achieve the effect of high engineering operability

Active Publication Date: 2014-10-29
郑州深澜动力科技有限公司
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Problems solved by technology

However, with the increase of battery life and the frequent acceleration, deceleration, start-stop and other complex operating conditions in the actual operation of electric vehicles, the DC internal resistance of the power battery pack will change to a certain extent. Considerin

Method used

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  • Online estimation method for direct current resistance of power battery of electric vehicle
  • Online estimation method for direct current resistance of power battery of electric vehicle
  • Online estimation method for direct current resistance of power battery of electric vehicle

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Embodiment Construction

[0031] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0032] This embodiment adopts a lithium-ion power battery pack composed of a lithium iron phosphate lithium-ion monomer produced by a certain company, and the purpose is to obtain the open circuit voltage, ohmic internal resistance, and electrical characteristic parameters of the polarization impedance in its first-order PNGV equivalent circuit. The schematic diagram of the PNGV equivalent circuit model is as follows Figure 10 shown.

[0033] Such as figure 1 As shown, the online estimation method of the DC impedance of the electric vehicle power battery pack of the present invention comprises the following steps:

[0034] S100. The vehicle-mounted charger performs constant current charging on the power battery, and replaces the power battery at equidistant SOC points (this embodiment takes 5% equidistant points, for example: 5%, 1...

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Abstract

The invention relates to an online estimation method for direct current resistance of a power battery of a plug-in hybrid electric vehicle or a pure electric vehicle. The online estimation method includes that in the process of charging through a vehicle-mounted charger, charging to appointed equally spaced SOC points in sequence in a constant-current charging mode, and then using a constant-voltage charging mode; when the current is reduced to an equalizing current designed by a monomer equalizer, casually opening and closing the equalizer of each monomer in sequence, using the equalizer to generate a composite pulse excitation on each monomer, recording the change curve of the terminal voltage thereof changed along with the time, substituting into a corresponding mathematical model of direct current resistance of the power battery to obtain the direct current resistance and open-circuit voltage of the battery, and calculating the direct current resistance and open-circuit voltage of a power battery pack according to the direct current resistance and open-circuit voltage of the battery. The online estimation method for the direct current resistance of the power battery of the electric vehicle is simple and reliable and has high practicability and performability.

Description

technical field [0001] The invention relates to an online estimation method for the DC impedance of a power battery pack of an electric vehicle, and belongs to the field of electric energy management of the power battery of an electric vehicle. Background technique [0002] The power battery is an important part of the electric vehicle. During its use, accurate control of the state parameters of the power battery plays a vital role in improving the performance and safety of the electric vehicle. At present, some state parameters of power batteries such as state of charge (state of charge, SOC), state of health (state of health, SOH) and state of power (state of power, SOP) cannot be obtained directly through sensors or other devices, and need to contact power The electrical characteristic parameters of the battery are estimated in real time by using certain mathematical methods. [0003] The most important electrical characteristic parameters that are difficult to obtain di...

Claims

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Application Information

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IPC IPC(8): G01R27/02G01R19/00
Inventor 杜常清张驰赵奕凡颜伏伍
Owner 郑州深澜动力科技有限公司
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