Polymer electrolyte hard packaging lithium ionic cell

A lithium-ion battery and polymer technology, applied in secondary batteries, battery components, circuits, etc., can solve problems such as failure, low yield, and shell damage, and reduce the probability of local short circuits Effect of improving high-temperature mechanical properties and safety performance

Inactive Publication Date: 2009-01-07
黄穗阳
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Polymer flexible packaging lithium-ion batteries also have their weaknesses: due to the use of soft and fragile aluminum-plastic composite films as the shell, not only the yield rate in the production process is low, the raw materials are more expensive, resulting in increased costs; Defects such as breakage occur frequently, not only causing the battery to fail, but also, a bulging and leaking battery can damage the electronic components around the battery, resulting in damage and failure of the entire electronic device

Method used

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Examples

Experimental program
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Effect test

example 1

[0071] The following method was used to produce a wound polymer electrolyte aluminum case lithium ion battery.

[0072] Manufacturing method of negative electrode belt:

[0073]Dissolve 3 grams of polyvinylidene fluoride in N-methyl-2-pyrrolidinedione, then add 2.5 grams of acetone black, and finally add 115 grams of graphite powder. After high-speed stirring, vacuum or static degassing, the slurry-like negative electrode slurry is made. The negative electrode slurry was coated on both surfaces of a 10 micron thick copper foil. Dry at 120°C to remove the solvent N-methyl-2-pyrrolidinedione, the thickness of the electrode strip is controlled at 300±10 microns, and the thickness of the electrode strip after rolling is controlled at 90±5 microns. Cut the negative electrode strip to 30x340mm 2 size. A nickel lead is then spot welded to the uncoated starting copper side.

[0074] Manufacturing method of positive electrode belt:

[0075] Dissolve 6 grams of polyvinylidene fluo...

example 2

[0083] The following method was used to produce a laminated polymer electrolyte aluminum case lithium-ion battery.

[0084] Manufacturing method of negative electrode belt:

[0085] Dissolve 3 grams of polyvinylidene fluoride in N-methyl-2-pyrrolidinedione, then add 3 grams of acetone black, and finally add 115 grams of graphite powder. After high-speed stirring, vacuum or static degassing, the slurry-like negative electrode slurry is made. The negative electrode slurry was coated on both surfaces of a 10 micron thick copper foil. The solvent N-methyl-2-pyrrolidinedione was dried and removed at 120° C., and the thickness of the electrode strip was controlled at 300±10 microns. The thickness of the electrode strip after rolling is controlled at 90±5 microns. Cut the negative electrode strip into a kitchen knife shape: the area of ​​the main knife is 30x50mm 2 Dimensions, handle area 5x7mm 2 Size, the handle part is uncoated copper foil, and its surface will be spot-welded ...

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Abstract

The invention relates to a polymer electrolyte rigid package lithium ion battery which adopts a polymer electrolyte and an ultrathin metal casing, the polymer electrolyte bonds a positive electrode and a negative electrode with a membrane, thus leading a battery core to have self-strength and self-rigidity; the thickness of the battery is no longer maintained by relying on the rigidity and hardness of the metal casing, but relying primarily on self-strength and self-rigidity of the battery and secondarily relying on the rigidity and hardness of the metal casing, the two mechanisms jointly act to control the battery thickness, and the purpose of improving the battery capacity is realized by filling a plurality of active materials. The polymer electrolyte improves safety of the battery, overcomes various defects of a polymer electrolyte soft package battery and improves reliability of the battery. Compared with the existing lithium battery with a liquid metal casing, the polymer electrolyte rigid package lithium ion battery produced by adopting the method can improve the capacity by 10-30%; compared with a polymer electrolyte soft package battery, the polymer electrolyte rigid package lithium ion battery produced by adopting the method can improve the capacity by 8-20%, and the bulge and leakage rate of the battery can be less than 0.1ppm.

Description

technical field [0001] The invention relates to a preparation method and production process of a novel secondary lithium ion battery. The lithium-ion battery uses a polymer electrolyte and an ultra-thin metal shell, which not only improves the battery capacity, but also enhances the safety of the battery, and also overcomes various defects of the polymer flexible packaging battery produced by the current technology, such as battery swelling and Liquid leakage, as well as wear and tear of the flexible packaging shell, etc., improve the reliability of the battery. This process technology can not only produce digital batteries used in electronic products such as Bluetooth and mobile phones, but also produce large-capacity and high-power power batteries, which are used in large-scale equipment such as electric vehicles, aviation and aerospace. [0002] According to the different metal materials used in the battery case, polymer electrolyte hard-packed lithium-ion batteries can ha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/40H01M2/14H01M2/02C08L101/12H01M10/0525H01M50/119H01M50/134H01M50/403H01M50/414H01M50/44
CPCY02E60/122Y02E60/10
Inventor 黄穗阳
Owner 黄穗阳
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