Method for on-line estimation of internal resistance of power lithium battery

A lithium battery, internal resistance technology, applied in the direction of measuring resistance/reactance/impedance, measuring electrical variables, measuring devices, etc., can solve problems such as estimating battery internal resistance, and achieve the effect of easy promotion and use

Active Publication Date: 2014-04-16
HUIZHOU EPOWER ELECTRONICS
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, most of the estimation of internal resistance is carried out in the theoretical stage, laboratory modeling test or vehicle external auxiliary equipment for internal resistance estimation, but during the driving process of electric vehicles, due to the limitations of test equipment and hardware platforms, external assistance cannot be added Equipment or other test equipment for measur

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  • Method for on-line estimation of internal resistance of power lithium battery
  • Method for on-line estimation of internal resistance of power lithium battery

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Embodiment Construction

[0018] In order to allow those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further described below in conjunction with the accompanying drawings.

[0019] The specific embodiment of the present invention is as figure 1 As shown, a method for estimating the internal resistance of a power lithium battery online, the method is:

[0020] S1: The car is powered on and running, and the battery management system obtains the working conditions of the car in real time;

[0021] S2: According to the real-time driving conditions of the vehicle, select the current change curve that is the same as or close to the real vehicle driving conditions;

[0022] In this embodiment, taking the sudden acceleration and deceleration condition of the vehicle as an example, the current change curve under this condition is as follows figure 2 As shown, the current change curve is obtained by simulating the driving conditions o...

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Abstract

The invention relates to a method for on-line estimation of internal resistance of a power lithium battery. The method for on-line estimation of the internal resistance of the power lithium battery comprises the steps that an automobile is energized to travel, and a battery management system obtains the working condition of the automobile in real time; a current changing curve graph with the working condition same as or close to the real-time traveling working condition of the automobile is selected according to the real-time traveling working condition of the automobile; the maximum current value I1 and the minimum current value I2 in the current changing curve graph are selected; in the process of traveling discharging process of the automobile, when the current value at present is equal to the maximum current value I1, the battery voltage value at the moment is recorded as the minimum voltage value U2; when the current value at present is equal to the minimum current value I2, the battery voltage value at the moment is recorded as the maximum voltage value U1; the formula R=(U1-U2)/(I1-I2) is used for calculating the battery direct-current resistance R. Compared with the prior art, an auxiliary device or other externally-connected measuring devices are not needed, internal resistance value of the power battery can be estimated in an on-line mode in the traveling process of the automobile, the method is used only according to real-time battery voltage data and real-time battery current data in the traveling process of the automobile, and the method is simple, easy to implement, practical, and easy to popularize and use.

Description

technical field [0001] The invention relates to the technical field of automotive power lithium batteries, in particular to a method for estimating the internal resistance of power lithium batteries online. Background technique [0002] Battery internal resistance is one of the most important characteristic parameters of a battery, and it is also one of the important indicators for evaluating battery performance. It can evaluate battery health, battery life estimation, system SOC estimation, power output / input capacity, and other battery operating conditions. Important parameters can also be used as the basis for evaluating whether the battery is damaged or faulty, or whether there is a problem with the connection of the battery. In the actual application of the battery management system, it is very necessary to estimate the real-time value of the internal resistance of the battery online. [0003] The internal resistance test includes AC internal resistance and DC internal...

Claims

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Application Information

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IPC IPC(8): G01R27/08
Inventor 刘飞文锋阮旭松余祖俊谢小科
Owner HUIZHOU EPOWER ELECTRONICS
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