Lithium ion battery structure and preparation method thereof

A lithium-ion battery and battery technology, applied in the direction of secondary batteries, structural parts, battery pack parts, etc., can solve the problems of not optimizing the sealing performance and barrier performance of packaging films, accelerating electrochemical corrosion, changing the composition of electrolyte, etc. Achieve excellent air tightness, slow down the decay rate, prevent leakage and moisture ingress

Active Publication Date: 2012-05-09
浙江遨优动力系统有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are burrs on the copper mesh and aluminum mesh around the polymer lithium-ion battery core. When vacuuming and shrinking, the burrs will pierce the inner membrane and may pierce the inner membrane until the aluminum foil, then the hydrofluoric acid in the battery core will pass through the aluminum foil and cause damage. Pitting corrosion accelerates electrochemical corrosion and changes the composition of the electrolyte. In severe cases, the aluminum foil will be corroded and leaked. At the same time, it will also cause a short circuit and cause the battery to be scrapped.
The battery performance problem caused by the packaging film has attracted more and more attention. Patent 200720156392.6 adds a protective film to the packaging film to protect the aluminum-plastic film, which can protect the packaging film from rupture caused by external effects to a certain extent, but does not optimize the packaging. Membrane sealing and barrier properties

Method used

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  • Lithium ion battery structure and preparation method thereof
  • Lithium ion battery structure and preparation method thereof
  • Lithium ion battery structure and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0038] Example 1: After mixing the positive electrode active material LiCoO2, conductive carbon black and conductive graphite in different proportions, PVDF was used as a binder to prepare a slurry; the negative active material MCMB, conductive carbon black, dispersant and binder The agent is mixed according to the mass ratio of 90:2:4.5:3.5, and then prepared into a slurry. Use a coating machine to evenly coat the positive electrode slurry on the aluminum foil, and evenly coat the negative electrode slurry on the copper foil. After vacuum drying at 80°C for 8 hours, roll pressing to make positive and negative electrode sheets, namely: lead-out electrode 2 The diaphragm is a polypropylene microporous film with a thickness of 0.020 mm, which is wound into a battery cell 1, and the packaging film 3 is an aluminum-plastic composite film, which is formed by cold stamping and covered with a double-layer packaging film, that is, the outer packaging film 31 and The inner packaging fi...

Embodiment 2

[0039] Example 2: After mixing the positive active material lithium iron phosphate, conductive carbon black and conductive graphite in different proportions, PVDF was used as a binder to prepare a slurry; the negative active material artificial graphite, conductive carbon black SP, dispersed After the agent SBR and the binder CMC are mixed according to the mass ratio of 91:1.5:4.5:3, the slurry is prepared. Use a coating machine to evenly coat the positive electrode slurry on the aluminum foil, and evenly coat the negative electrode slurry on the copper foil. After vacuum drying at 80°C for 8 hours, roll pressing to make positive and negative electrode sheets, that is, to make lead-out The electrode 2; the diaphragm is a 0.030 mm thick polypropylene microporous film, which is wound into the cell 1 . The packaging film 3 is an aluminum-plastic film, and the gas storage chamber is reserved first, and sealed with a pulse sealing machine; the electrolyte solution 1 mol / L LiPF6 / Ec...

Embodiment 3

[0040] Embodiment 3: After mixing the positive electrode active material ternary material, conductive carbon black and conductive graphite in different proportions, PVDF is used as a binder to prepare a slurry; the negative electrode active material artificial graphite, conductive carbon black, and dispersant After mixing with the binder at a mass ratio of 90:2:4.5:3.5, the slurry was prepared; the positive electrode slurry was evenly coated on the aluminum foil with a coating machine, and the negative electrode slurry was evenly coated on the copper foil. After vacuum drying at ℃ for 8 hours, roll pressing to make positive and negative electrode sheets. The diaphragm is a polypropylene microporous film, which is wound into a cell 1 . The packaging film 3 is an aluminum-plastic film, formed by a bag-making process, and ultrasonically bonded and heat-sealed. The electrolyte is 1 mol / L LiAsF6 / EMP-BF4. Activate in the opening of the vacuum activation cabinet. Pre-sealed on an ...

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Abstract

The invention discloses a lithium ion battery structure and a preparation method thereof. The structure comprises a battery cell and extraction electrodes thereof, wherein the outside of the cell is provided with at least one layer of packaging film; the packaging film is aluminum-plastic composite film or a plastic composite film and leads out the electrodes and extends outside of the packaging film; and the lithium ion battery and the preparation method adopt the multi-layer aluminum-plastic composite film or the plastic composite film as the packaging film, prepare the lithium ion battery with long service life by sealing repeatedly; and the battery of the structure can effectively prevent the crack of the corner of the packaging film and other positions, prevent the sealing position of the packaging film from cracking, reduces the air-blowing phenomenon of the battery, improves the separation property and the seal property of the packaging film, prolongs the service life of the battery and is particularly suitable for high-power battery with long service life.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a lithium-ion battery structure and a preparation method thereof, belonging to the field of new energy. Background technique [0002] Lithium-ion battery is a new type of rechargeable battery developed in the past ten years. It has high specific energy, no memory effect, green environmental protection, and its discharge voltage is three times that of nickel-cadmium and nickel-metal hydride batteries. A new generation of batteries with high versatility. Possessing the three major advantages of the current battery industry development, it is called "the most promising chemical power source" by people, so it has been widely noticed by people once it came out, and its development is very rapid. At present, the industrialization in Japan and the United States is doing very well. my country is the earliest developing country in the industrialization and development of l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/38H01M2/02H01M50/124H01M50/126
CPCY02E60/12Y02E60/10Y02P70/50
Inventor 陈光森艾群陈泽平刘兰英
Owner 浙江遨优动力系统有限公司
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