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Manufacturing process for non-diaphragm lithium ion cell, and battery

A production process, non-diaphragm technology, used in non-aqueous electrolyte batteries, electrolyte battery manufacturing, electrode manufacturing and other directions, can solve the problems of low battery safety, poor thermal stability, poor mechanical strength of diaphragms, etc., to improve mechanical strength, avoid Puncture phenomenon, prevent short circuit phenomenon or produce the effect of fire and explosion

Inactive Publication Date: 2017-03-15
YINLONG ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the above technical problems, the present invention designs a manufacturing process of a lithium-ion battery without a diaphragm, in order to solve the problem of low battery safety due to poor mechanical strength and poor thermal stability of the diaphragm

Method used

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Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0029] Step 1, the ceramic powder Al 2 o 3 and binder according to the mass ratio of Al 2 o 3 : PVDF is dispersed in NMP at a ratio of 50:1 to make a ceramic powder slurry with a solid content of 70%.

[0030] Step 2: Apply the prepared ceramic powder slurry evenly on the surface of the positive electrode sheet. When coating, the ceramic powder completely covers the positive electrode active material on the surface of the positive electrode sheet, and then dry and compact the ceramic powder containing 20 μm coated positive electrode.

[0031] Step 3: Assembling the positive electrode sheet and the negative electrode sheet obtained in step 2 in parallel with the ceramic coating to make a battery cell.

[0032] Step 4, wrapping and fixing the battery cell, packaging it, filling it with electrolyte, and activating it to form a battery.

no. 2 example

[0034] Step 1, ceramic powder and binding agent are Al according to mass ratio 2 o 3 :MgO:PVDF=25:25:1 is dispersed in NMP to make a ceramic powder paste slurry with a solid content of 64%.

[0035] In step 2, the prepared ceramic powder slurry is evenly coated on the surface of the positive electrode sheet. When coating, the ceramic powder completely covers the positive electrode active material on the surface of the positive electrode sheet, and then dried and compacted to obtain a slurry containing 20μm ceramic coated cathode sheet.

[0036] Step 3: Assembling the positive electrode sheet and the negative electrode sheet obtained in step 2 in parallel with the ceramic coating to make a battery cell.

[0037] Step 4, wrapping and fixing the battery cell to form a battery.

no. 3 example

[0039] Step 1, ceramic powder and binder according to ceramic powder: Al 2 o 3 : MgO: sodium carboxymethyl cellulose = 15:25:1 and dispersed in sodium carboxymethyl cellulose to make a ceramic powder slurry with a solid content of 53%.

[0040] Step 2: Apply the prepared ceramic powder slurry evenly on the surface of the positive electrode sheet. When coating, the ceramic powder completely covers the positive electrode active material on the surface of the positive electrode sheet, and then dry it. After drying and compacting The obtained positive electrode sheet contains a 20 μm ceramic coating, where the ceramic coating is.

[0041] Step 3: Assembling the positive electrode sheet and the negative electrode sheet obtained in step 2 in parallel with the ceramic coating to make a battery cell.

[0042] Step 4, wrapping and fixing the battery cell to form a battery.

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Abstract

The invention provides a manufacturing process for a non-diaphragm lithium ion cell. The manufacturing process comprises the steps of coating the surface of a positive plate and / or negative plate with ceramic powder slurry; and then assembling the positive plate and the negative plate into a cell. According to the manufacturing process, the surface of the positive plate or negative plate is coated with the ceramic powder slurry; and then the positive plate and the negative plate are assembled, so that the existing diaphragm is omitted, the mechanical strength in assembling the positive plate and the negative plate is improved, the phenomenon of battery expansion and explosion caused by puncture in use of the common diaphragm is avoided, and a short-circuit phenomenon is effectively prevented; and furthermore, the non-diaphragm lithium ion cell has microporous omni-directional property, so that the requirements of electronic insulation and ionic conduction characteristic between the positive plate and the negative plate are satisfied. The invention also designs a battery applying the process.

Description

technical field [0001] The invention relates to the technical field of battery assembly, in particular to a manufacturing process of a diaphragm-free lithium-ion battery and the battery. Background technique [0002] In the field of battery assembly technology, the battery diaphragm is a layer of diaphragm material between the positive and negative electrodes of the battery, which affects the safety of the battery. The ions in the electrolyte can pass freely between the positive and negative electrodes. The battery separator is generally made of resin materials such as polyethylene or polypropylene. However, in the prior art, the separator has poor mechanical strength, is easily punctured, has poor thermal stability, and is prone to problems such as battery swelling or explosion. Contents of the invention [0003] In order to solve the above technical problems, the present invention designs a manufacturing process of a lithium-ion cell without a diaphragm, in order to so...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/058H01M10/0525H01M10/04H01M4/04
CPCH01M4/0404H01M10/0404H01M10/0525H01M10/058Y02E60/10Y02P70/50
Inventor 吴彬杰李海军蔡慧群
Owner YINLONG ENERGY CO LTD
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