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A surface wetting treatment method for battery cell diaphragm of new energy automobile battery

A technology for new energy vehicles and battery cells, which is applied to battery pack components, circuits, electrical components, etc., and can solve problems such as affecting the ion permeability of electrolytes, insufficiently uniform pore size of cell diaphragms, and insufficient wettability of electrolytes, etc. , to achieve the effect of improving the battery yield rate, long charging cycle life, and good flatness

Inactive Publication Date: 2019-01-18
南京世界村汽车动力有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the structure of new energy batteries, the diaphragm is one of the key inner components. The performance of the diaphragm determines the interface structure, internal resistance, etc. of the battery, which directly affects the capacity, cycle and safety performance of the battery. A diaphragm with excellent performance is beneficial to improve The overall performance of the battery plays an important role. The main function of the separator is to separate the positive and negative electrodes of the battery to prevent the short circuit caused by the contact between the two electrodes. In addition, it also has the function of allowing electrolyte ions to pass through. The existing cell separator has insufficient aperture. Even, the gaps are not suitable enough, which affects the permeability of electrolyte ions, and the existing cell separator is generally made of polypropylene or polyethylene material, the high temperature resistance is not good enough, it is easy to cause a short circuit of the battery, and at the same time, the existing cell separator is The wetting performance of the electrolyte is not good enough, the liquid absorption and moisturizing ability is poor, and the inorganic ions are easily detached from the surface of the diaphragm, which seriously affects the charge and discharge life of the battery. Solve the problems existing in the existing technology

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A new energy vehicle battery cell diaphragm infiltration surface treatment method

[0036] Step 1: Prepare the diaphragm

[0037] Put the prepared polypropylene and polyethylene resin materials into a heater, heat them to a molten state, then put the mixture into a blender, stir for 40 minutes, and the stirring temperature is 40 degrees Celsius to make a mixture, and then flatten the mixture Spread on the carrier, after cooling, the cooling temperature is 3 degrees Celsius, and it is extruded into a rough diaphragm with a tablet press, and the thickness of the rough diaphragm is 25 microns;

[0038] Step 2: Extract the diaphragm

[0039] Put the diaphragm into the reaction tank, soak it with a volatile extractant, soak for 70 minutes, pick up the diaphragm, stretch it once with a stretcher, wait for 15 minutes, wait until the extractant is completely volatilized, use a stretcher The stretching machine stretches the diaphragm for the second time to make a microporous d...

Embodiment 2

[0055] A new energy vehicle battery cell diaphragm infiltration surface treatment method

[0056] Step 1: Prepare the diaphragm

[0057] Put the prepared polypropylene and polyethylene resin materials into a heater, heat them to a molten state, then put the mixture into a blender, stir for 40 minutes, and the stirring temperature is 40 degrees Celsius to make a mixture, and then flatten the mixture Spread on the carrier, after cooling, the cooling temperature is 3 degrees Celsius, and it is extruded into a rough diaphragm with a tablet machine, and the thickness of the rough diaphragm is 25 microns;

[0058] Step 2: Extract the diaphragm

[0059] Put the diaphragm into the reaction tank, soak it with a volatile extractant, soak for 70 minutes, pick up the diaphragm, stretch it once with a stretcher, wait for 15 minutes, wait until the extractant is completely volatilized, use a stretcher The stretching machine stretches the diaphragm for the second time to make a microporous...

Embodiment 3

[0075] A new energy vehicle battery cell diaphragm infiltration surface treatment method

[0076] Step 1: Prepare the diaphragm

[0077] Put the prepared polypropylene and polyethylene resin materials into a heater, heat them to a molten state, then put the mixture into a blender, stir for 40 minutes, and the stirring temperature is 40 degrees Celsius to make a mixture, and then flatten the mixture Spread on the carrier, after cooling, the cooling temperature is 3 degrees Celsius, and it is extruded into a rough diaphragm with a tablet machine, and the thickness of the rough diaphragm is 25 microns;

[0078] Step 2: Extract the diaphragm

[0079] Put the diaphragm into the reaction tank, soak it with a volatile extractant, soak for 70 minutes, pick up the diaphragm, stretch it once with a stretcher, wait for 15 minutes, wait until the extractant is completely volatilized, use a stretcher The stretching machine stretches the diaphragm for the second time to make a microporous...

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Abstract

A surface wetting treatment method for battery cell diaphragm of new energy automobile battery includes preparing diaphragm, extracting diaphragm, preparing a coating agent, drying the diaphragm, coating the diaphragm, preparing a polyester fiber membrane, unifying two membranes, and performing immersion treatment and vacuum plating. The present invention is characterized in that a diaphragm is made of a mixed material of polypropylene and polyethylene, compared with polypropylene, the diaphragm resists high temperature; compared with polyethylene, the diaphragm resists low temperature; combined with the composite of polyester fiber membrane, the diaphragm has thermal stability, high temperature resistance, low temperature output, long charging cycle life, moderate mechanical strength; andthrough the effect of the extracting agent, the invention facilitates the extraction of the soluble substance after the film is formed, makes the diaphragm into a microporous structure, and cooperates with the stretching action before and after the extraction to make the micropores more uniform, so that the permeability is stronger even when the electrolyte ions are transmitted, and the tensile strength and the mechanical properties of the diaphragm are improved by stretching, so that the diaphragm is not easy to be broken.

Description

technical field [0001] The invention relates to the field of battery diaphragm treatment, in particular to a method for treating the surface of a new energy vehicle battery cell diaphragm infiltration. Background technique [0002] In the structure of new energy batteries, the diaphragm is one of the key inner components. The performance of the diaphragm determines the interface structure, internal resistance, etc. of the battery, which directly affects the capacity, cycle and safety performance of the battery. A diaphragm with excellent performance is beneficial to improve The overall performance of the battery plays an important role. The main function of the separator is to separate the positive and negative electrodes of the battery to prevent the short circuit caused by the contact between the two electrodes. In addition, it also has the function of allowing electrolyte ions to pass through. The existing cell separator has insufficient aperture. Even, the gaps are not s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M50/403H01M50/414
CPCH01M50/411H01M50/44H01M50/403H01M50/449Y02E60/10
Inventor 孙兰娟李健芮忠南
Owner 南京世界村汽车动力有限公司
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