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Safe high-energy folding case lithium ion battery and its production technology

A lithium-ion battery and battery technology, applied in the direction of secondary batteries, electrochemical generators, battery components, etc., can solve the problems of reducing the market competitiveness of battery companies, difficult to achieve production technology, low battery capacity, etc., to achieve The effect of avoiding the deterioration of the internal condition of the battery, dredging and controlling the internal air pressure of the battery

Inactive Publication Date: 2009-02-18
黄穗阳
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The liquid lithium-ion batteries and polymer soft-pack lithium-ion batteries produced by the prior art not only cannot meet the requirements in terms of thinness, lightness, arbitrary shape and energy density, but also have the following problems and defects:
However, polymer flexible packaging lithium-ion batteries also have their problems and shortcomings: ①The soft and fragile aluminum-plastic composite film shell is easy to damage, resulting in low yield and high production cost in the production process; ②The raw materials depend on imports from Japan, and the price More expensive, high material cost; ③In the process of stamping the aluminum-plastic composite film into a box, due to being stretched, the inner CPP film is easily damaged, resulting in the occurrence of box cancer defects, which will slowly cause battery swelling and leakage ;④The aluminum-plastic composite film shell is sealed by heat and pressure, and the defect rate is high, which often causes defects such as battery bulging, liquid leakage, and shell damage, which not only cause battery failure, but also bulging and leaking batteries will damage the electronics around the battery. components, leading to damage and failure of the entire electronic device
Therefore, under the condition of the same square size, metal-shell liquid lithium batteries are less filled with active battery materials than polymer soft-pack lithium batteries, so their battery capacity is 10% to 30% lower
[0009] (4) The cost of mold opening for the metal case of new battery products is high and the cycle is long: With the development of the mobile communication, digital and consumer electronics markets, requirements for different dimensions of batteries emerge in an endless stream, and there are various battery specifications.
These not only increase the new product development cost of battery manufacturers, but also, in the face of the rapidly changing market, the longer development time cycle reduces the market competitiveness of battery companies
[0010] (5) Due to the limitation of the existing technology, the thickness of the metal shell lithium battery can only produce battery products with a thickness specification of 3.0mm or more
For thin or ultra-thin lithium batteries smaller than this thickness requirement, the existing production technology is difficult to achieve

Method used

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  • Safe high-energy folding case lithium ion battery and its production technology
  • Safe high-energy folding case lithium ion battery and its production technology
  • Safe high-energy folding case lithium ion battery and its production technology

Examples

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example 1

[0053] The following method was used to produce an aluminum folded case lithium-ion battery in which the battery core was wound.

[0054] Manufacturing method of negative electrode belt:

[0055] 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. Coat the negative electrode slurry 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 250±10 microns. The thickness of the tape after rolling is controlled at 110±5 microns. Cut negative electrode strip to 44 x 340mm 2 size. A nickel lead is then spot welded to the uncoated starting copper side.

[0056] Manufacturing method of positive electrode belt:

[0057] 6 grams of polyvinylidene fluoride are dis...

example 2

[0067] The following method was used to produce a steel folded case lithium-ion battery. Among them, the battery core is laminated

[0068] Manufacturing method of negative electrode belt:

[0069] 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 260±10 microns. The thickness of the electrode strip after rolling is controlled at 110±5 microns. Cut the negative electrode strip into a kitchen knife shape: the area of ​​the main knife is 32 x 46mm 2 Dimensions, handle area 5 x 7mm 2 Size, the handle part is uncoated copper foil, and its surface ...

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Abstract

The invention relates to a joggled shell lithium ion battery that forms a composite battery shell with metal chaff and temperature-sensitive macromolecule. Five temperature and pressure safety valves are equipped on a metal / macromolecule composite joggled shell, which overcomes problem of present liquid state lithium ion battery and defects of polymer soft package batteries, and improves battery reliability. Compared with present liquid state metal shell lithium ion battery, the joggled shell lithium ion battery of the invention has volume improved 10% to 30%; compared with present polymer soft package batteries, the battery of the invention has volume improved 3% to 10% with tympanites and liquid leakage rate less than 0.1ppm. In addition, there is a little of joggled plate material, manufacturing device and mould being simple. Consumption of the materials and energy loss in process is less, which reduces cost, manufactures the battery adequately, meets need of the customers for various battery sizes and fills blank of super thin lithium ion battery field below 3.0mm.

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 an innovatively designed and uniquely prepared metal / polymer composite shell and safety valve device, which not only significantly enhances the safety of the battery, but also increases the battery capacity, and overcomes the liquid lithium-ion battery produced by current technology. The problems and various defects of the polymer flexible packaging battery 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] The folded shell lithium ion battery of the present invention can also be called a hard shell polymer lithium battery, and the folded s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/38H01M2/02H01M2/08H01M2/12H01M10/0525H01M50/119H01M50/121H01M50/133H01M50/183H01M50/30H01M50/342
CPCY02E60/10
Inventor 黄穗阳
Owner 黄穗阳
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