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Lithium ion three-electrode laminate polymer battery and testing method thereof

A soft-pack battery and three-electrode technology, which is applied in the field of lithium-ion batteries, can solve problems such as inability to accurately simulate polarization conditions, and achieve the effect of easy production

Inactive Publication Date: 2018-10-09
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The three-electrode system has the advantages of simple installation and easy operation, but in this system, the amount of electrolyte is much larger than that of the actual pouch battery, and it cannot accurately simulate the polarization of the actual pouch battery during charging and discharging.

Method used

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  • Lithium ion three-electrode laminate polymer battery and testing method thereof
  • Lithium ion three-electrode laminate polymer battery and testing method thereof
  • Lithium ion three-electrode laminate polymer battery and testing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Use a lamination machine to stack the positive and negative plates and the cell 2 separators into a soft-packed battery, and weld the positive and negative poles of the soft-packed battery to the positive and negative tabs respectively, of which the positive and negative tabs are The thickness is 0.4-1 mm, and the width is 20-30 mm.

[0040] Fold the lithium sheet 31 to cover one end of the reference electrode lug, roll the lithium sheet 31 with a cylinder, make the lithium sheet 31 and the reference electrode ear closely fit, and finally wrap one end of the reference electrode ear with the lithium sheet 31 One layer of diaphragm 34 is covered to obtain reference electrode 3, such as figure 1 shown. The thickness of the tab of the reference electrode is 0.1-0.5 mm, and the width is 2-5 mm. The lithium sheet 31 has a length of 8-13 mm, a width of 5-12 mm, and a thickness of 0.5-1 mm.

[0041] Insert one end of the lithium sheet 31 of the reference electrode 3 prepared...

Embodiment 2

[0047] A three-electrode pouch battery was prepared in the same manner as in Example 1, and the formation, aging, and capacity separation were performed.

[0048] Connect the three voltage channels of the multi-channel voltage recorder to positive / negative, positive / reference electrode, and negative / reference electrode respectively.

[0049] Connect the positive and negative electrodes of the soft pack to the automatic charging and discharging equipment, and perform constant current charging and discharging at a rate of 1C at room temperature.

[0050]The data of each test channel is derived from the multi-channel voltage recorder, and the potentials of the positive and negative electrodes relative to the reference electrode during the formation process can be obtained. Find the time when the potential of the negative electrode relative to the reference electrode drops to 0V during the charging process, and the potential difference between the positive and negative electrodes,...

Embodiment 3

[0052] A three-electrode pouch battery was prepared in the same manner as in Example 1, and the formation, aging, and capacity separation were performed.

[0053] Place the three-electrode soft pack in a 0°C incubator, and after standing for 2 hours, connect the three voltage channels of the multi-channel voltage recorder to positive / negative, positive / reference electrode, and negative / reference electrode respectively.

[0054] Connect the positive and negative poles of the soft pack to the automatic charging and discharging equipment, and perform constant current charging and discharging at a rate of 2C.

[0055] The data of each test channel is derived from the multi-channel voltage recorder, and the potentials of the positive and negative electrodes relative to the reference electrode during the formation process can be obtained. Find the time when the potential of the negative electrode relative to the reference electrode drops to 0V during the charging process, and the po...

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Abstract

The invention discloses a lithium ion three-electrode laminate polymer battery. The lithium ion three-electrode laminate polymer battery comprises an aluminum plastic film, a battery cell, a referenceelectrode, electrolyte, a positive electrode lug and a negative electrode lug, wherein one end, inserted into the battery cell, of the reference electrode, is wrapped with a lithium wafer; the positive electrode lug and the negative electrode lug are respectively connected with a positive electrode and a negative electrode of the battery cell by welding; the aluminum plastic film wraps the battery cell and the reference electrode; and the reference electrode extends out of the aluminum plastic film. The lithium ion three-electrode laminate polymer battery disclosed by the invention is easy toproduce, is close to a commercial two-electrode laminate polymer battery in structure and is equivalent to the commercial two-electrode laminate polymer battery in electrolyte amount, so that polarization conditions of the positive and negative electrodes of the three-electrode laminate polymer battery are close to those of the two-electrode laminate polymer battery in the charge / discharge process. Therefore, potentials, which are obtained by a multichannel voltage recorder, of the positive and negative electrodes relative to the reference electrode in the testing process, can reflect potential changes of the positive and negative electrodes of the two-electrode laminate polymer battery in the charge / discharge process, and further the potential changes are used as standards for judging lithium-precipitating potential of the two-electrode laminate polymer battery and have an important effect on a charge design method.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a lithium ion three-electrode pouch battery and a testing method thereof. Background technique [0002] Lithium-ion batteries are widely used in consumer electronics and new energy vehicles. As people's requirements for charging speed are getting higher and higher, the charging rate needs to be increased accordingly. At a specific temperature, when charging with a large current, the polarization potential of the negative electrode is relatively large. After charging at a certain voltage, the potential of the negative electrode will drop below 0V (relative to Li / Li+), and lithium will be deposited on the surface of the negative electrode, which will affect the safety of the battery. performance and cycle life. In order to monitor the voltage between the positive and negative electrodes corresponding to when the negative electrode begins to decompose lithium (the ne...

Claims

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Application Information

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IPC IPC(8): H01M10/0525H01M10/058H01M2/02G01R31/36H01M50/10
CPCH01M10/0525H01M10/058H01M50/10Y02E60/10Y02P70/50
Inventor 庄向阳郑奇王光俊吴翰杰
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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