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A kind of membrane impregnation method of soft pack lithium-ion battery

A technology for ion batteries and soft-packed lithium, which is applied in the direction of battery pack parts, electrolyte storage battery manufacturing, non-aqueous electrolyte storage batteries, etc., can solve the problems of high energy consumption and long soaking time, and achieve low energy consumption, simple steps, and improved The effect of net liquid volume

Active Publication Date: 2020-09-15
WANXIANG 123 CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method uses high temperature infiltration, which has the disadvantages of long infiltration time and high energy consumption

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Put the laminated bare cell into an aluminum-plastic film packaging bag, and inject the required amount of electrolyte in a dry environment to obtain a soft-packed cell;

[0028] (2) Put the soft-packed battery cells in a sealed container, with the battery air bag opening facing upwards, fill the container with dry air and pressurize it to 0.3Mpa, then keep the pressure for 0.5h;

[0029] (3) After vacuuming the soft-packed battery cells, seal the aluminum-plastic film packaging bag, and the vacuum degree of vacuuming is -80Kpa;

[0030] (4) Place the sealed pouch cells in the sealed container in step (2) again, and fill the container with dry air again, pressurize to 0.3Mpa, and keep the pressure for 3 hours;

[0031] (5) Take out the pouch cell and put it aside for aging at 35°C.

Embodiment 2

[0033] (1) Put the laminated bare cell into an aluminum-plastic film packaging bag, and inject the required amount of electrolyte in a dry environment to obtain a soft-packed cell;

[0034] (2) Put the soft-packed battery cells in a sealed container, with the battery air bag opening facing upwards, fill the container with dry air and pressurize it to 0.11Mpa, and keep the pressure for 2 hours;

[0035] (3) After vacuuming the soft-packed battery cells, seal the aluminum-plastic film packaging bag, and the vacuum degree of vacuuming is -60Kpa;

[0036] (4) Place the sealed pouch cells in the sealed container in step (2) again, and fill the container with dry air again, pressurize to 0.11Mpa, and keep the pressure for 8 hours;

[0037] (5) Take out the pouch cell and put it aside for aging at 35°C.

Embodiment 3

[0039] (1) Put the laminated bare cell into an aluminum-plastic film packaging bag, and inject the required amount of electrolyte in a dry environment to obtain a soft-packed cell;

[0040] (2) Place the soft-packed battery cells in a sealed container with the battery air bag opening facing up, fill the container with dry nitrogen and pressurize it to 0.2Mpa, and then keep the pressure for 1 hour;

[0041] (3) After vacuuming the soft-packed battery cells, seal the aluminum-plastic film packaging bag, and the vacuum degree of vacuuming is -70Kpa;

[0042] (4) Place the sealed pouch cells in the sealed container in step (2) again, and fill the container with dry nitrogen again to pressurize to 0.2Mpa and keep the pressure for 5 hours;

[0043] (5) Take out the pouch cell and put it aside for aging at 30°C.

[0044] The invention can be implemented under normal temperature conditions, the steps are simple, the operability is strong, the energy consumption is low, and there is n...

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PUM

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Abstract

The invention discloses a diaphragm infiltration method for a soft-packed lithium-ion battery. Under normal temperature conditions, the lithium-ion soft-packed battery core is pressurized twice, and the soft-packed battery core is squeezed by external pressure to make the positive and negative electrodes inside the battery The gas in the coating and the diaphragm gap is discharged so that the electrolyte can enter the diaphragm smoothly, so that the pores in the diaphragm can be quickly and fully occupied by the electrolyte. The invention has simple steps, strong operability, low energy consumption, no special requirements on equipment, can improve the infiltration efficiency and infiltration effect, and at the same time increases the net liquid volume of the electrolyte in the diaphragm, which is beneficial to improving the electrochemical performance of the battery.

Description

technical field [0001] The invention relates to the technical field of preparation of lithium-ion batteries, in particular to a diaphragm infiltration method for soft-pack lithium-ion batteries. Background technique [0002] The diaphragm is an important part of the lithium-ion battery system, and the diaphragm not only affects the heat resistance of the battery [0003] It also affects the electrochemical comprehensive characteristics such as the capacity and cycle performance of the battery. [0004] Common lithium-ion battery separators mainly include polyethylene (PE), polypropylene single-layer separator (PP), and PP / PE / PP three-layer membrane. The surface energy of the above-mentioned diaphragm is low, and the connectivity of the electrolyte is not strong, which will affect the ion conduction inside the battery, thereby affecting the electrochemical performance of the lithium-ion battery. Therefore, it is particularly important to improve the electrolyte wettability ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/14H01M10/058H01M50/40
CPCH01M10/058H01M50/403Y02E60/10Y02P70/50
Inventor 张伟李凡群韩笑谭歌
Owner WANXIANG 123 CO LTD
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