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DC internal resistance measuring method and device of battery

A technology of DC internal resistance and measurement method, which is applied in the direction of measuring device, measuring electricity, measuring electrical variables, etc., can solve the problems of low precision and insufficient accuracy of DC internal resistance, and achieve the effect of improving accuracy

Active Publication Date: 2017-08-15
BEIJING ELECTRIC VEHICLE
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  • Abstract
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Problems solved by technology

[0003] However, the estimation method in the prior art, the estimated DC internal resistance of the battery is not accurate enough, and the precision is not high

Method used

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  • DC internal resistance measuring method and device of battery
  • DC internal resistance measuring method and device of battery
  • DC internal resistance measuring method and device of battery

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Embodiment Construction

[0037] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0038] The method and device for measuring the DC internal resistance of the battery according to the embodiment of the present invention will be described below with reference to the accompanying drawings.

[0039] figure 1 It is a schematic flowchart of a battery DC internal resistance measurement method provided by an embodiment of the present invention.

[0040] At present, the online estimation method of the DC impedance of the electric vehicle power battery pack is to use the on-board charger to charge the charging process, ...

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Abstract

The invention provides a DC internal resistance measuring method and device of a battery. The method comprises that discharging performance test is carried out on a first battery at different ambient temperatures to obtain current values and voltage values corresponding to different states of charge; the current values and voltage values corresponding to the different states of charge are calculated according to a battery equivalent circuit model to obtain DC internal resistances corresponding to the different states of charge; polynomial fitting is carried out according to the DC internal resistances corresponding to the different states of charge in the ambient temperatures to establish a mathematical DC internal resistance estimation model; the mathematical model indicates relation among the DC internal resistance, state of charge and temperature; and a DC internal resistance of a second battery is estimated via the mathematical model under the condition that the ambient temperature and the state of charge of the second battery are known. Thus, the mathematical DC internal resistance estimation model is established, the DC internal resistance is estimated on the basis of the temperature of the state of charge of the battery, and the estimating accuracy for the DC internal resistance of the battery is improved.

Description

technical field [0001] The invention relates to the technical field of electric vehicles, in particular to a method and device for measuring a DC internal resistance of a battery. Background technique [0002] The power battery is an important part of the electric vehicle, and the battery plays a vital role in improving the performance and safety of the electric vehicle during the operation of the electric vehicle. At present, some electrical characteristic parameters of the battery, such as DC internal resistance and open circuit voltage, cannot be directly measured by sensors or other devices. It needs to be measured by estimation by using certain mathematical methods based on other electrical characteristic parameters of the battery. [0003] However, in the estimation method in the prior art, the estimated DC internal resistance of the battery is not accurate enough, and the precision is not high. Contents of the invention [0004] The present invention aims to solve ...

Claims

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Application Information

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IPC IPC(8): G01R31/36G01R27/08
CPCG01R27/08G01R31/389
Inventor 陈卓杨重科韩广璞
Owner BEIJING ELECTRIC VEHICLE
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