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Method for manufacturing lithium ion battery by using gel diaphragm

A technology of lithium-ion batteries and manufacturing methods, which is applied in the field of lithium-ion battery manufacturing using gel diaphragms, can solve problems such as serious adhesion between diaphragms and cells, poor electrolyte infiltration, and safety of cells, and achieve overall temperature Good consistency, prevent lithium precipitation phenomenon, improve the effect of liquid retention

Inactive Publication Date: 2020-12-18
TIANJIN ENERGIES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of this, the present invention aims to propose a lithium-ion battery manufacturing method using a gel diaphragm to solve the serious adhesion between the diaphragm and the battery cell during the lithium battery manufacturing process, which leads to poor infiltration of the electrolyte, resulting in lithium separation in the battery cell, Potential safety hazards caused by batteries

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0071] S1. Making the positive electrode sheet: mix and stir lithium iron phosphate, conductive carbon black Super-P, and Solef5130 according to the ratio of 0.9:0.06:0.04 to obtain the positive electrode slurry, coat the positive electrode slurry on the aluminum foil and dry to obtain the electrode roll. Then obtain the positive electrode sheet by rolling, slitting, and die-cutting;

[0072] S2. Making the negative electrode sheet: mix and stir natural graphite, conductive carbon black Super-P, and styrene-butadiene rubber in a ratio of 0.92:0.02:0.06 to obtain the negative electrode slurry, coat the negative electrode slurry on the copper foil and dry to obtain the electrode roll , followed by rolling, slitting, and die-cutting to obtain the negative electrode sheet;

[0073] S3. Pole piece baking: place the positive pole piece and the negative pole piece under vacuum conditions for baking respectively. The baking temperature is 100°C, the vacuum degree is -1Mpa, the nitroge...

Embodiment 2

[0087] S1. Making the positive electrode sheet: mix and stir lithium iron phosphate, graphite conductive agent KS-15, and Solef5130 according to the ratio of 0.92:0.06:0.02 to obtain the positive electrode slurry, coat the positive electrode slurry on the aluminum foil and dry to obtain the electrode roll. Then obtain the positive electrode sheet by rolling, slitting, and die-cutting;

[0088] S2. Making negative pole pieces: mix and stir natural graphite, graphite conductive agent KS-15, and styrene-butadiene rubber in a ratio of 0.95:0.02:0.03 to obtain negative electrode slurry, and coat the negative electrode slurry on copper foil and dry to obtain pole coils , followed by rolling, slitting, and die-cutting to obtain the negative electrode sheet;

[0089] S3. Pole piece baking: place the positive pole piece and the negative pole piece under vacuum conditions for baking respectively. The baking temperature is 85°C, the vacuum degree is -1Mpa, the nitrogen replacement freque...

Embodiment 3

[0103] S1. Making the positive electrode sheet: Mix and stir nickel-cobalt lithium manganese oxide, graphite conductive agent KS-15, and Solef5130 according to the ratio of 0.96:0.03:0.01 to obtain the positive electrode slurry, coat the positive electrode slurry on the aluminum foil and dry it to obtain the electrode roll, and then obtain the positive electrode sheet by rolling, slitting, and die-cutting;

[0104] S2. Making the negative electrode sheet: Mix artificial graphite, graphite conductive agent KS-15, and styrene-butadiene rubber in a ratio of 0.96:0.01:0.03 to obtain the negative electrode slurry, and coat the negative electrode slurry on the copper foil and dry it to obtain the negative electrode slurry. roll, and then obtain the negative electrode sheet by rolling, slitting, and die-cutting;

[0105] S3. Pole piece baking: place the positive pole piece and the negative pole piece under vacuum conditions for baking respectively. The baking temperature is 85°C, the...

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Abstract

The invention provides a method for manufacturing a lithium ion battery by using a gel diaphragm. The method comprises the following steps of manufacturing a positive pole piece, manufacturing a negative pole piece, baking the pole pieces, laminating, preheating, carrying out primary hot pressing, carrying out primary cold pressing, manufacturing a battery cell, pre-charging, ageing, carrying outsecondary hot pressing, carrying out secondary cold pressing, forming and finishing the manufacturing of the battery cell. According to the manufacturing method of the lithium ion battery using the gel diaphragm, the gel diaphragm is adopted, firstly, preheating, hot pressing and cold pressing are conducted on the core package after lamination, and in the stage, the pressure of hot pressing and cold pressing is small, so that the gel diaphragm slightly adheres to a pole piece to achieve a fixed core package structure. Secondly, pressure is applied to the battery cell in a pre-charging stage; and finally, the procedures of hot pressing and cold pressing are added before the formation procedure, so that the tight bonding of the positive / negative pole piece and the gel diaphragm is realized.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a manufacturing method of a lithium ion battery using a gel diaphragm. Background technique [0002] With the vigorous development of electric vehicles, the market demand for power batteries has grown rapidly in recent years. At the same time, as the country’s subsidy for electric vehicles has declined, only electric vehicles with a certain cruising range can receive financial promotion subsidies, which puts forward higher requirements for the energy density of batteries, which leads to the increasing volume of power batteries. Large, the substantial increase in the size of the battery makes the safety performance of the battery face a huge challenge. [0003] Due to the small size of the previous lithium-ion battery, its laminated / packaged structure is relatively stable. However, with the further improvement of the energy density of the battery cell in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/058H01M10/44H01M10/0525
CPCH01M10/0525H01M10/058H01M10/446H01M2220/20Y02E60/10Y02P70/50
Inventor 杨爽李学苏畅王俊姿
Owner TIANJIN ENERGIES
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