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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AI-Extracted 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 ...
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Method used

[0031] After S3, the electric core 2 and the reference electrode 3 are coated with the aluminum-plastic film 1, the positive pole ear...
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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.

Application Domain

Final product manufactureSmall-sized cells cases/jackets +3

Technology Topic

Plastic filmVoltage +6

Image

  • 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(4)

Example Embodiment

[0038] Example 1
[0039] Use a stacking machine to stack the positive and negative plates and the battery cell 2 separator into a soft pack battery, and weld the positive and negative electrodes of the soft pack battery to the positive electrode tab and the negative electrode tab respectively. The thickness is 0.4 to 1 mm, and the width is 20 to 30 mm.
[0040] Fold the lithium sheet 31 to wrap one end of the reference electrode lug, and roll the lithium sheet 31 with a cylinder to make the lithium sheet 31 and the reference electrode lug closely fit, and finally wrap the end of the reference electrode lug with the lithium sheet 31 With a layer of diaphragm 34, the reference electrode 3 is obtained, such as figure 1 Shown. The thickness of the reference electrode tab is 0.1-0.5mm, and the width is 2-5mm. The lithium sheet 31 has a length of 8 to 13 mm, a width of 5 to 12 mm, and a thickness of 0.5 to 1 mm.
[0041] Insert one end of the lithium sheet 31 of the reference electrode 3 prepared above into the middle of the inner layer of the soft-packed cell to obtain a three-electrode bare cell.
[0042] The three-electrode bare cell is covered by the aluminum plastic film 1 and heat-sealed the sides of the positive and negative electrodes and the side of the reference electrode 3 to fix the positive and negative electrode tabs and the reference electrode tabs.
[0043] After injecting the electrolyte, vacuum and heat seal the three-electrode soft-pack battery, such as figure 2 Shown.
[0044] Connect the three voltage channels of the multi-channel voltage recorder to positive/negative, positive/reference electrode, and negative/reference electrode respectively.
[0045] Connect the positive and negative poles of the soft pack to the automatic charging and discharging equipment, perform the formation of the three-electrode soft pack, and export the data of each test channel from the multi-channel voltage recorder to obtain the potential of the positive and negative electrodes relative to the reference electrode during the formation process ,Such as Figure 5 Shown.

Example Embodiment

[0046] Example 2
[0047] A three-electrode soft-pack battery was prepared in the same manner as in Example 1, and was formed, aged, and separated.
[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 case to the automatic charging and discharging equipment, and perform constant current charging and discharging at a rate of 1C at room temperature.
[0050] Derive the data of each test channel from the multi-channel voltage recorder to obtain the potential of the positive and negative electrodes relative to the reference electrode during the formation process. 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 electrode and the negative electrode, that is, the lithium evolution potential of the soft package system when charged at 1C at room temperature.

Example Embodiment

[0051] Example 3
[0052] A three-electrode soft-pack battery was prepared in the same manner as in Example 1, and was formed, aged, and separated.
[0053] Put the three-electrode soft bag in a 0℃ thermostat, and after standing for 2 hours, connect the three voltage channels of the multi-channel voltage recorder to the positive electrode/negative electrode, the positive electrode/reference electrode, and the negative electrode/reference electrode.
[0054] Connect the positive and negative poles of the soft bag to the automatic charging and discharging equipment, and perform constant current charging and discharging at a rate of 2C.
[0055] Derive the data of each test channel from the multi-channel voltage recorder to obtain the potential of the positive and negative electrodes relative to the reference electrode during the formation process. 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, that is, the lithium evolution potential of the soft package system when charged at 2C at a temperature of 0℃, such as Image 6 Shown.

PUM

PropertyMeasurementUnit
Length8.0 ~ 13.0mm
Width5.0 ~ 12.0mm
Thickness0.5 ~ 1.0mm

Description & Claims & Application Information

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