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Direct current resistance measuring method for electric vehicle battery pack

A DC resistance, electric vehicle technology, applied in the direction of measuring resistance/reactance/impedance, measuring electricity, measuring devices, etc., can solve the problems of increased DC internal resistance detection errors and errors of battery packs, and achieve effective measurement and measurement accuracy. high effect

Active Publication Date: 2012-06-27
HUIZHOU EPOWER ELECTRONICS
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  • Abstract
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Problems solved by technology

It can be seen that when the current of the battery pack changes rapidly, the DC internal resistance detection error of the battery pack will increase significantly, and even cause errors

Method used

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  • Direct current resistance measuring method for electric vehicle battery pack
  • Direct current resistance measuring method for electric vehicle battery pack
  • Direct current resistance measuring method for electric vehicle battery pack

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Embodiment Construction

[0023] In order to facilitate the understanding of those skilled in the art, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments:

[0024] as attached Figure 4 It is the battery voltage and current waveform of the electric vehicle battery pack working voltage and current asynchronous due to the sampling delay. It can be seen from the figure that the voltage and current of the battery are obviously out of sync. If the traditional method of directly estimating the DC internal resistance of the battery using the voltage and current variation values ​​will be significantly different.

[0025] Considering the sampling delay between the voltage and current of the battery pack, select the time period T of multiple sampling delays as the synchronization judgment period, such as selecting 10 times the synchronization time difference (the synchronization time difference is calculated by the detection cycle and c...

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Abstract

A direct current resistance measuring method for an electric vehicle battery pack includes the following steps: 1 choosing certain time as a period T, and collecting maximum battery voltage Umax and minimum voltage Umin in the period T; 2 collecting maximum current Imax and minimum current Imin in the period T; and 3 measuring direct current resistance R of the battery pack according to the following formula R=(Umax-Umin) / (Imax-Imin). The direct current resistance measuring method solves problems that battery direct current inner resistance estimation error is added caused by desynchrony of battery voltage sampling and current sampling, achieves effective measuring and calculation of battery direct current inner resistance and is high in measuring and calculation accuracy.

Description

technical field [0001] The invention relates to a method for measuring and calculating the internal resistance of an electric vehicle battery pack. Background technique [0002] The DC internal resistance (R) test method of a single battery is relatively simple, by synchronously sampling the terminal voltage (U) of the battery and the operating current (I) of the battery, and using figure 1 The voltage change corresponding to the current change of the battery is shown to obtain the DC internal resistance of the battery. The calculation method is DC internal resistance R=(U2-U1) / (I1-I2) of the battery. [0003] However, when the batteries are connected in series, the current flowing through each single battery is exactly the same, so the battery pack generally only collects one current, and the voltage of all single batteries must be collected. In order to save costs, generally multiple digital and analog The conversion circuit samples the single battery in parallel, but ad...

Claims

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Application Information

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IPC IPC(8): G01R27/08G01R31/36
Inventor 刘飞阮旭松文锋
Owner HUIZHOU EPOWER ELECTRONICS
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