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Nondestructive diagnosis of battery performance

A battery and battery pack technology, applied in the direction of measuring electricity, measuring electrical variables, measuring resistance/reactance/impedance, etc., to achieve the effect of accurately determining performance and measuring accurately

Inactive Publication Date: 2012-03-28
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in actual production, the internal resistance of the lithium-ion battery is measured by a battery internal resistance meter, which is tested by an AC signal of 1000 Hz and needs to be measured when the battery is not loaded, which brings a lot of inconvenience to the lithium battery test. Determine the battery DC discharge (charge) internal resistance online, so that the battery performance can be determined during the load or detection process

Method used

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  • Nondestructive diagnosis of battery performance
  • Nondestructive diagnosis of battery performance
  • Nondestructive diagnosis of battery performance

Examples

Experimental program
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Effect test

Embodiment 1

[0021] Use the lithium-ion battery inspection device to conduct a charge-discharge test for a certain type of lithium-ion, and record the current and voltage values ​​during the charge-discharge process, take one of the complete charge-discharge processes, and record the serial number (representing the test time) as the X-axis , the battery voltage is plotted on the Y axis. From the figure, we can see the change of voltage with the charge and discharge time. It is easy to see that there are sudden changes at the beginning and end of discharge. Refer to the attached figure 2 . Calculate the change value of voltage sudden drop at the beginning of discharge, take the instantaneous value of current at the start of discharge, divide the change value of voltage sudden drop by the instantaneous value of current, and obtain the DC discharge internal resistance of the battery. Count the internal resistance of 20 DC discharges, see the attached image 3 , take the upper middle value o...

Embodiment 2

[0023] Select batteries with different internal resistances for cycle tests, take the second complete charge and discharge process of each battery cycle test, and record the sudden change value of the discharge start voltage and the instantaneous value of the current. Calculate the DC discharge internal resistance of each battery, and compare the relationship between the DC discharge internal resistance and the AC test internal resistance. And take the internal resistance obtained by the AC test as the X axis, and the DC discharge internal resistance as the Y axis to draw a graph, and the attached Figure 4 . From attached Figure 4 It can be seen that the DC discharge internal resistance is basically consistent with the change in the battery internal resistance obtained by the AC test, indicating that the estimation of the battery performance by the DC discharge internal resistance is consistent with the estimation of the battery performance by the AC discharge internal resi...

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Abstract

The invention relates to the technical field of lithium ion battery direct-current internal resistance measurement, in particular to a method for determining battery performance according to direct-current internal resistance of a battery, which is calculated according to a transient voltage jump difference value and instantaneous current of a lithium ion battery and a battery pack at the beginning or ending of charging and discharging. The method comprises the following steps of: (1) monitoring current values and terminal voltages of various batteries on line in the charging and discharging process of the lithium ion battery; (2) detecting and recording a voltage jump value of the battery at the beginning or ending of discharging (charging) of the lithium ion battery; (3) detecting and recording the instantaneous current flowing through the battery at the beginning or ending of discharging (charging) of the lithium ion battery; (4) dividing voltage jump different values of the various batteries by a current value to obtain a ratio called direct-current discharging (charging) internal resistance of the battery; and (5) referring to the pre-determined standard direct-current discharging (charging) internal resistance of the battery to determine the battery performance, wherein the battery is qualified when the direct-current discharging (charging) internal resistance of the battery is smaller than the standard value and the battery is non-qualified when the direct-current discharging (charging) internal resistance of the battery is greater than the standard value.

Description

technical field [0001] The present invention relates to the field of lithium-ion battery DC internal resistance testing, more specifically refers to the calculation of battery DC discharge (charging) internal resistance according to the instantaneous voltage mutation at the beginning or end of the lithium-ion battery during the charging and discharging process, And according to the DC discharge (charge) internal resistance to determine the battery performance method. Background technique [0002] At present, a charging and discharging device including a lithium-ion battery is provided, such as an automatic detection device for a lithium-ion battery, which implements full-process monitoring of the lithium-ion charging and discharging process, and detects the real-time terminal voltage of the lithium-ion battery, the current flowing through the battery, and the battery capacity. As the above-mentioned automatic detection device, provide a method to determine the performance of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/36G01R27/08
Inventor 王太宏罗雨陈立宝王耀玲黄睿李丽华
Owner HUNAN UNIV
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