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Method for carrying out rubber coating and fixing on lithium ion battery cell

A lithium-ion battery and lithium-ion technology, applied in the direction of secondary batteries, circuits, electrical components, etc., can solve problems such as low efficiency, wrinkled diaphragm, poor adhesive tape, etc., to optimize the existing fixing technology and improve Better production efficiency and pasting effect

Inactive Publication Date: 2018-11-16
常州金中源智能装备有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional battery cell glue sticking method is cumbersome, low in efficiency and high in cost
Adhesive has the defect of diaphragm wrinkling, and the adhesive tape is not good, which affects the stability of the battery structure, and at the same time causes the cell diaphragm to wrinkle, etc.

Method used

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  • Method for carrying out rubber coating and fixing on lithium ion battery cell
  • Method for carrying out rubber coating and fixing on lithium ion battery cell

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0049] Preferably, the preparation method of described glue solution specifically comprises the following steps:

[0050] (1) Add the binder into the solvent and stir to make it fully dissolve;

[0051] (2) Continue stirring after dissolving, then reduce the stirring speed, and stir until the viscosity of the glue is 1000-5000mpas to obtain the glue.

[0052] Preferably, in step (1), the stirring time is 0.5-1.5h, more preferably 1-1.5h.

[0053] Preferably, in step (2), the time for continuing stirring is 2-3.5 h, more preferably 2-3 h.

[0054] The glue is prepared by a characteristic method, the binder is added to the solvent and stirred to make it fully dissolved, the binder is added to the solvent and stirred, fully dissolved, continued to stir after dissolving, and then slow down the stirring speed to eliminate air bubbles. Test the viscosity of the obtained slurry. If the viscosity is 1000-5000mpas, it can be discharged. If the viscosity is higher than 5000mpas, add s...

Embodiment 1

[0056] The diaphragm is wrapped around the positive electrode sheet or negative electrode sheet stacked with lithium ions, and the end of the diaphragm wrapped is pasted and fixed on the middle part of the positive electrode sheet or negative electrode sheet with glue; specifically, the prepared glue is sprayed through a special nozzle At the end of the diaphragm, the glue solution was dried and fixed at 65°C.

[0057] Wherein, glue adopts following method to prepare:

[0058] (1) Add 3 parts of polyvinylidene fluoride binder with a molecular weight of 10,000 to 97 parts of acetone and stir for 0.5 hours, continue stirring for 2 hours after fully dissolving, and then slow down the stirring speed to eliminate air bubbles;

[0059] (2) Viscosity test is carried out on the obtained slurry, if the viscosity is 1000-5000mpas, then it can be discharged; if the viscosity is higher than 5000mpas, then add some solvent and stir until the viscosity meets the requirements.

Embodiment 2

[0061] The diaphragm is wrapped around the positive electrode sheet or negative electrode sheet stacked with lithium ions, and the end of the diaphragm wrapped is pasted and fixed on the middle part of the positive electrode sheet or negative electrode sheet with glue; specifically, the prepared glue is sprayed through a special nozzle At the end of the diaphragm, the glue was dried and fixed at 75°C.

[0062] Wherein, glue adopts following method to prepare:

[0063] (1) Add 12 parts of polyvinylidene fluoride binder with a molecular weight of 1,500,000 to 88 parts of acetone and stir for 1.5 hours, continue stirring for 2.5 hours after fully dissolving, and then slow down the stirring speed to eliminate air bubbles;

[0064] (2) Viscosity test is carried out to the obtained slurry, if the viscosity is 3000-5000mpas, then it can be discharged; if the viscosity is higher than 5000mpas, then add some solvent and stir until the viscosity meets the requirements.

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Abstract

The invention provides a method for carrying out rubber coating and fixing on a lithium ion battery cell. An exsissting fixed mode of adhesive tape pasting is improved, and a way that a glue solutionis used for pasting and fixing is adopted to fix the final ending part of a diaphragm on any position on a positive pole piece or a negative pole piece. By use of the method, an exsissting fixing technology is optimized, lithium ion battery production efficiency is improved, the manufacture cost of the lithium ion battery is lowered, and the requirement of a wider range in lithium ion battery production is met. According to the method, specific glue solution is adopted and is prepared from a specific binder and a solvent, and the glue solution prepared by the specific preparation method has abetter pasting effect.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a method for fixing lithium-ion battery cores with glue. Background technique [0002] In recent years, electric vehicles have gradually appeared in our lives. With the continuous increase in performance requirements for automotive power lithium-ion batteries, lithium-ion batteries are required to have the advantages of light weight, high specific energy, high voltage platform, and environmental protection. It is widely used in electronic equipment, energy storage equipment and electric vehicles, and the requirements for improving production efficiency and reducing costs of lithium-ion batteries are also increasing, which seriously restricts the development of lithium-ion batteries. [0003] At present, lithium-ion batteries are produced in two types: winding structure and laminated structure. The traditional way of sticking battery cells with glue is cumbersome, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0583
CPCH01M10/0583Y02E60/10Y02P70/50
Inventor 毛建王阳
Owner 常州金中源智能装备有限公司
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