Liquid injection and humidity method for lithium ion battery

A lithium-ion battery and liquid injection technology, applied in secondary batteries, battery pack parts, non-aqueous electrolyte batteries, etc., can solve the problems of increased wetting cost, high dew point temperature requirements of pressurized gas, etc., and achieve no increase in equipment. The effect of investment, battery internal resistance and capacity consistency improvement, and simple implementation

Inactive Publication Date: 2008-09-17
JIANGSU DIO ENERGY SCI TECH
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Problems solved by technology

Although this method can speed up the absorption rate of the electrolyte by the cell and improve the pass rate, it is realized by pressurization, which

Method used

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  • Liquid injection and humidity method for lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Example 1: A 2000 mAh battery in flexible packaging. After injecting liquid into the cell, put it into a sealed humidification box, vacuumize to -0.1Mpa, stop vacuuming, and make it drop to -0.02Mpa, and then vacuumize to -0.02Mpa again. -0.1Mpa, so uninterrupted and repeated wetting for 12 minutes.

Embodiment 2

[0011] Example 2: 2000 mAh battery with steel shell, put the cell in a sealed humidification box, evacuate to -0.1Mpa, after injecting liquid, make it drop to -0.02Mpa, and then evacuate to -0.1Mpa again, So uninterrupted repeated wetting for 15 minutes.

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Abstract

The invention relates to an improvement of wetting method of lithium-ion battery liquid injection, characterized in that negative pressure wetting is negative pressure cycle changed wetting in -0.1MPa to -0.02MPa vacuum. Electrical core absorbs electrolyte wetly, uniformly and quickly because of using cycle changed negative pressure, the battery reaches liquid injection requirement only 12 to 15 minutes when the flexible packaging is 2000 mA, the time of liquid injection wetting is saved about 1/2 compared with the time of original constant negative pressure wetting, and consistency of internal resistance and capacity of battery is improved greatly, the consistency can improve at least about 10 percent compared with the original technology wetting. In addition, the realizing way of changing negative pressure circularly is simple, and need not increase equipment investment basically, and has low use-cost, and is easy to implement.

Description

technical field [0001] The invention is an improvement to a liquid injection wetting method for a lithium ion battery, in particular to a liquid injection wetting method for a lithium ion battery with fast wetting speed and good battery consistency and quality. Background technique [0002] In the lithium-ion battery production process, one of them is the electrolyte injection wetting process, which is to make the electrolyte evenly distributed in the pole piece and separator, and improve the utilization rate of the active material of the positive and negative materials. If the pole piece is wetted unevenly, the capacity of the battery will be reduced, and the internal resistance of the battery will be high, which will affect the service life of the battery. In order to fully wet the battery cell, the existing technology usually adopts a constant negative pressure liquid injection wetting process, even if the cell is wetted by injecting liquid under negative pressure, or the...

Claims

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Application Information

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IPC IPC(8): H01M2/36H01M10/40H01M10/058H01M50/609H01M50/618
CPCY02E60/122Y02E60/10Y02P70/50
Inventor 王建良吉孟君蒋国卫
Owner JIANGSU DIO ENERGY SCI TECH
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