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Method for compounding diaphragm and pole piece of wound laminated battery

A winding and diaphragm technology, which is applied in the direction of secondary batteries, battery pack parts, circuits, etc., can solve the problems of uneven coating of glue, excessive glue, closed cells, etc., and achieve firm adhesion and improved The effect of adhesion properties

Active Publication Date: 2016-07-06
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the commonly used diaphragm coating method is the coating method. However, the coating process can easily cause uneven coating of the glue, resulting in closed cells caused by too much glue in some areas of the diaphragm; in addition, due to the glue coating Generally thin, so the requirements for the coating process are very strict

Method used

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  • Method for compounding diaphragm and pole piece of wound laminated battery
  • Method for compounding diaphragm and pole piece of wound laminated battery
  • Method for compounding diaphragm and pole piece of wound laminated battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] In a 5L blender, add 3L of N-methylpyrrolidone NMP, then add 100g of epoxy resin to dissolve, stir until a clear and transparent solution is formed, and place the dispersed epoxy resin solution in an open container , And then dipping the diaphragm substrate in the epoxy resin glue at a rate of 20HZ; such as figure 1 As shown, the polymerized monomer 2 adheres to the diaphragm substrate 1;

[0031] Add 100g of polyamide to another blender and dissolve it with NMP. After being evenly dispersed, pass the pole piece through the polyamide glue to complete the dip; figure 2 As shown, the cross-linking agent 3 adheres to the pole piece 6;

[0032] The dipped separator is brought into contact with the positive pole piece and a pressure of 0.2T is applied, and then the cross-linking curing reaction occurs through an oven at 80° C., that is, the composite of the separator and the positive pole piece is realized. Such as image 3 , 4 As shown, when the two are in contact and a certain...

Embodiment 2

[0033] Example 2: In a 5L blender, add 3L of deionized water, then add 100g of acrylic resin to dissolve, stir until a clear and transparent solution is formed, put the dispersed acrylic solution in an open container, and then place the diaphragm base with Dip in the glue of acrylic resin at a certain rate; add 100g of amino resin to another blender and dissolve it with deionized water. After uniformly dispersed, the diaphragm substrate is then immersed in amino resin at a certain rate. In the glue solution, the dipping is completed, and then the dipped separator is brought into contact with the negative pole piece and a pressure of 0.5T is applied, and then the cross-linking curing reaction occurs through an oven at 100°C, that is, the separator and the negative pole piece are realized Compound.

Embodiment 3

[0034] Example 3: In a 5L blender, add 3L of N-methylpyrrolidone NMP, then add 100g of hydroxyacrylic acid to dissolve it, stir until a clear and transparent solution is formed, place the dispersed hydroxyacrylic acid solution in an open container, and then The separator with the inorganic coating is dipped in the hydroxy acrylic glue at a certain rate; 100g of polyurethane is added to another blender and dissolved with NMP. After the dispersion is uniform, the inorganic coating The layer diaphragm passes through the polyurethane glue at a certain rate to complete the dipping, and then the dipped coated diaphragm is brought into contact with the positive pole piece and applied with a pressure of 0.1T, and then passed through an oven at 50°C and kept for more than 10 minutes The cross-linking and curing reaction takes place, that is, the composite of the coated separator and the positive pole piece is realized.

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Abstract

The invention discloses a method for compounding a diaphragm and a pole piece of a wound laminated battery. Through cross-linking reaction of a polymerization monomer and a cross-linking agent, the diaphragm can be compounded and adhered to the pole piece. The method comprises the following steps of: firstly, coating a layer of a polymerization monomer solution on a to-be-adhered diaphragm; coating a layer of a cross-linking agent solution on a to-be-adhered pole piece; and finally directly contacting the coated diaphragm with the coated pole piece, exerting the pressure of 0.1-0.5T, heating to 50-100 DEG C, performing cross-linking reaction on the polymerization monomer and the cross-linking agent, thereby compounding and connecting the diaphragm with the pole piece. By adopting the method, a conventional mode that the surface of the diaphragm or the pole piece is coated by an adhesive is avoided, but the diaphragm and the pole piece can be tightly bounded through cross-linking reaction, the chemical bond energy generated in chemical reaction is greatly higher than adhesion strength of a common adhesive, the adhesion property of coated layers can be greatly improved, and the pole piece and the diaphragm can be relatively solidly bounded.

Description

Technical field [0001] The present invention is a lithium -ion battery technology field, which involves a diaphragm and polar composite method that specifically involves a rolling stacking battery. Background technique [0002] As a new generation of chemical power supply, lithium -ion batteries are currently widely used in consumer electronics products because they have the advantages of nickel -metal hydride, nickel -cadmium, and lead acid batteries.Mixed power cars.At present, the production method of lithium -ion batteries is mainly covered and overlapping. From the perspective of the performance and actual production of lithium -ion battery: the advantage of the winding type is that the process is easy, and the advantage of the stack type is that the quality of the battery is good in all aspects of the battery.In order to comprehensively the advantages of the two processes, the focus of attention is currently focusing on the wound -type stacked battery. [0003] At present...

Claims

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Application Information

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IPC IPC(8): H01M10/0525H01M10/0583H01M2/14H01M50/46
CPCH01M10/0525H01M10/0583H01M50/461Y02E60/10Y02P70/50
Inventor 王双双李新峰臧强武行兵王义飞
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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