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Lithium ion battery DCR test result correction method

A technology of lithium-ion batteries and test results, which is applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., and can solve problems such as misjudgment of battery performance

Active Publication Date: 2021-05-18
捷威动力工业江苏有限公司
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  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for correcting the DCR test results of lithium-ion batteries, which solves the problem that the existing DCR side-view results easily cause misjudgment of battery performance

Method used

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Embodiment 1

[0032] refer to figure 1 and figure 2 , a kind of correction method of lithium-ion battery DCR test result, comprises the steps:

[0033] Step 1: Randomly select a number of batteries to be tested for DCR from the production line;

[0034] Step 2: Put the battery cell into an incubator with a temperature of T°C. The temperature T and the temperature set during the test cannot cause damage to the performance of the battery cell. The incubator should be connected to the charging and discharging equipment so that the cell It can be charged and discharged without being taken out, and the storage time is counted as t. This time should ensure that the temperature of the battery body is consistent with the environment in the incubator or the deviation is minimal;

[0035] Step 3: According to the DCR test process of the production line, charge / discharge the battery cells in the incubator for a short period of time with high current;

[0036] Step 4: After the test of the above st...

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Abstract

The invention discloses a lithium ion battery DCR test result correction method, which comprises the following steps of: adjusting the temperature of a constant temperature box, and placing batteries in it for the same time; acquiring a temperature value of each adjustment, a last voltage value before the corresponding DCR test, a test tail end voltage value and a charge and discharge current value data of each tested battery, and calculating to obtain the 'temperature and DCR' data of all groups, wherein a linear relation of fitting the DCR and the temperature is DCR correction=DCR actual*(a+bT-cT2); and collecting the temperature of the cell bodies before the DCR test and uploading the temperature to an upper computer program of the DCR by means of a sensor to obtain the corrected DCR. According to the lithium ion battery DCR test result correction method, the linear relation of fitting the DCR and the temperature is obtained through a design experiment, the temperature of the cell bodies is detected through the high-precision infrared temperature sensor, and the detected temperature data and the obtained fitting relation are combined with a data processing system of DCR test equipment, so that the DCR is corrected, and the accuracy is improved.

Description

technical field [0001] The invention relates to a method for correcting the DCR test result of a lithium ion battery. Background technique [0002] The currently commonly used lithium-ion battery DCR test method is to charge / discharge the lithium-ion battery with a high current for a short period of time, and calculate the ratio of the voltage difference before and after charging and discharging to the current, which is the DCR value. [0003] The DCR of lithium-ion batteries is an important indicator to measure battery performance, mainly composed of ohmic internal resistance and polarization internal resistance. Among them, the ohmic internal resistance is composed of electrode materials, electrolyte, diaphragm resistance and contact resistance of various parts, and the polarization internal resistance is jointly determined by electrochemical polarization and concentration polarization. When the temperature is high, the internal materials of the battery are more active, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/385
CPCG01R31/385Y02E60/10
Inventor 张永亮许少辉杨益志刘丹
Owner 捷威动力工业江苏有限公司
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