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Lithium ion battery self-discharging quick screening method and screening method based on DC impedance

A lithium-ion battery and DC impedance technology, which is applied in the direction of measuring devices, measuring electricity, and measuring electrical variables, can solve the problems of misjudgment of measurement accuracy, low recognition rate of slightly self-discharging cells, and time-consuming problems. Achieve the effects of improving accuracy, saving manpower and equipment investment, and improving production efficiency

Active Publication Date: 2019-08-30
天津普兰能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the method based on standing still requires a period of stagnation, and at the same time requires a second retest of the cell data to calculate the difference, that is, the first test data is used, and due to the influence of measurement accuracy, misjudgment often occurs and the corresponding situation of production ; and the screening of charging time or capacity in the constant voltage charging stage can only screen out the batteries with serious abnormal self-discharge, and the recognition rate for slightly self-discharge batteries is low
Patent No. CN102901931A discloses a method for screening lithium batteries with abnormal self-discharge by charging lithium-ion batteries in parallel after they are fully charged and using an ammeter to observe the net inflow and outflow of current between branches. The factor is the difference in SOC, and it also takes a lot of time to stand still and a lot of investment in tooling

Method used

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  • Lithium ion battery self-discharging quick screening method and screening method based on DC impedance
  • Lithium ion battery self-discharging quick screening method and screening method based on DC impedance
  • Lithium ion battery self-discharging quick screening method and screening method based on DC impedance

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Experimental program
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Effect test

Embodiment 1

[0022] The battery cell is selected as a 20ah ternary / lithium titanate cylindrical battery cell, and the shipping state is 50% SOC. At the end of the formation, the battery cell is charged or discharged to the shipping state, and then this test is performed. Install the above-mentioned cells into the cell filling position of the lower busbar, connect the upper busbar and the lower busbar to the charging and discharging machine of the high-current charging and discharging equipment, and use the charging and discharging machine to charge the screening device with a current of 2C×7 for 5s, read Take the current of the 5th second, and the specific values ​​are shown in Table 1;

[0023] Table 1

[0024]

[0025]

[0026] According to the data in Table 1, it can be seen that the current value of the No. 5 cell is significantly higher than that of the other 6 groups, which means it is a defective cell. In order to further verify, the above-mentioned cell was fully charged and ...

Embodiment 2

[0031] Select the battery cell as a 20ah ternary / lithium titanate cylindrical battery cell, and the shipping state is 50% SOC. At the end of the formation, charge or discharge the battery cell to the shipping state to perform this test. This test expands the sample size to 28 single cells.

[0032] First test the 28 batteries by the standing method, and after standing at high temperature for 3 days, detect the OCV difference. The test data are shown in Table 3, and the unit is V;

[0033] table 3

[0034]

[0035]

[0036] According to the data in Table 3, the test results are all normal, and the 28 single cells have no defective cells. Then divide the 28 cells into 4 groups, install them in the lower busbar, connect them to the upper busbar in turn, charge the screening device with a current of 5C×7 for 5s, and read the current of the 5th second. The specific value is as follows: Table 4;

[0037] Table 4

[0038] serial number 1 2 3 4 5 6 7 Cu...

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Abstract

The invention relates to a lithium ion battery self-discharging quick screening method and screening method based on DC impedance. Multiple monomer cells are connected in parallel to form a parallel battery system, thereby constructing a screening device, the DC impedance testing is performed on the parallel batter system to screened the data-discrete mono cells; the DC impedance testing specifically is to give a current wave within short time, and then read the distribution of the current in different branches after short-time pulse. The screening device disclosed by the invention has the advantages that a high-efficiency, low-input and easily-realized self-discharging screening scheme is provided; compared with the standing method, the detection time is greatly shortened, the manpower equipment input is saved, the production period is shortened, and the production efficiency is improved; and meanwhile, the distinguishing between the cells in slight short-circuit and non-short-circuitcan be enlarged by controlling the input current, the mono cell with short-circuit potential can be induced as the short-circuited cell to identify, and the detection accuracy rate is improved.

Description

technical field [0001] The invention belongs to the field of battery detection, and in particular relates to a self-discharging rapid screening device and screening method for lithium-ion batteries based on DC impedance. Background technique [0002] At present, with the requirements of national policies for environmental protection and favorable policies for industrial upgrading, the lithium-ion battery industry has developed by leaps and bounds. Lithium-ion batteries are widely used in energy storage, power vehicles and other fields. In the application process, after the batteries made in the same way are combined into a battery pack, its service life is lower than that of a single battery. This shows that the consistency of the single battery significantly affects the service life of the battery pack. In the series-parallel application of batteries, the consistency of single cells affects the efficiency and life of the battery pack, and safety issues also have an impact...

Claims

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Application Information

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IPC IPC(8): G01R31/396G01R31/378G01R31/385
CPCG01R31/378G01R31/385G01R31/396
Inventor 陈永胜崔玉刚崔维国王茂范李爱红
Owner 天津普兰能源科技有限公司
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