Protective film and preparation method thereof, and lithium ion battery using protective film

A lithium-ion battery and protective film technology, which is applied in the direction of secondary batteries, battery pack components, circuits, etc., to achieve the effects of improved thermal diffusion, high weather resistance, and simple preparation methods

Pending Publication Date: 2020-09-25
HUBEI JINQUAN NEW MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, the above solutions still need to be improved in terms of reducing the risk of battery thermal runaway and improving battery life.

Method used

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  • Protective film and preparation method thereof, and lithium ion battery using protective film
  • Protective film and preparation method thereof, and lithium ion battery using protective film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] This embodiment provides a protective film, the protective film is composed of a base film and a coating on one side of the base film, the coating includes a binder polytetrafluoroethylene and an insulating material titanium dioxide, the insulating material and adhesive The mass ratio of the binder is 0.6:1, the material of the base film is polypropylene, the thickness of the protective film is 70 μm, and the thickness of the base film is 50 μm.

[0053] This embodiment also provides a method for preparing the above-mentioned protective film, the specific steps of which are:

[0054] 1) First, mix polyvinylidene fluoride and N-methylpyrrolidone in a mixing tank at a mass ratio of 1:16 at 25°C to make a uniform binder solution;

[0055] 2) Then, add the magnesium oxide to the glue in 1), wherein the mass ratio of the glue to magnesium oxide is 1:0.6, and mix evenly at 30° C. to obtain a slurry;

[0056] 3) Coating the slurry onto the prepared 50 μm thick polypropylene i...

Embodiment 2

[0061] This embodiment provides a protective film, the protective film is composed of a base film and coatings on both sides of the base film, the coating includes adhesive polyacrylic acid and insulating material zinc oxide, the insulating material and adhesive The mass ratio of the agent is 0.4:1, the material of the base film is polyethylene terephthalate, the thickness of the protective film is 100 μm, and the thickness of the base film is 80 μm.

[0062] This embodiment also provides a method for preparing the above-mentioned protective film, the specific steps of which are:

[0063] 1) Firstly, polyacrylic acid (solid content: 49%) emulsion and water were stirred and mixed uniformly in a stirring tank at 35° C. in a mass ratio of 1:2 to prepare a uniform binder solution;

[0064] 2) Then, add the zinc oxide to the glue in 1), wherein the mass ratio of the glue to zinc oxide is 1:0.4, and mix evenly at 35° C. to obtain a slurry;

[0065] 3) Apply the slurry to the prepar...

Embodiment 3

[0068] This embodiment provides a protective film, the protective film is composed of a base film and a coating on one side of the base film, the coating includes a binder polytetrafluoroethylene and an insulating material titanium dioxide, the insulating material and adhesive The mass ratio of the binder is 1:1, the material of the base film is polyimide, the thickness of the protective film is 150 μm, and the thickness of the base film is 120 μm.

[0069] This embodiment also provides a method for preparing the above-mentioned protective film, the specific steps of which are:

[0070] 1) First, the polytetrafluoroethylene (40% solid content) emulsion and absolute ethanol were stirred and mixed uniformly at 15° C. in a stirring tank at a mass ratio of 1:1 to prepare a uniform binder solution;

[0071] 2) Then add the titanium dioxide to the glue solution in 1), wherein the mass ratio of the glue solution to titanium dioxide is 1:1, and mix evenly at 10° C. to obtain a slurry;...

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Abstract

The invention provides a protective film and a preparation method thereof, and a lithium ion battery using the protective film, wherein the protective film comprises a base film and a coating coated on the base film, and the coating comprises an insulating material and a binder. The preparation method comprises the following steps: 1) mixing a binder, a solvent and an insulating material to obtainslurry; and 2) coating a base film with the slurry to obtain the protective film. The protective film provided by the invention is an insulating film with high weather resistance and high thermal conductivity, and can effectively reduce the temperature in the battery in the high-current or high-power charging and discharging process of the battery, so that the thermal runaway risk of the lithiumbattery under the working condition is reduced, the safety and reliability of the battery are greatly improved, and the service life of the battery can be prolonged by reducing the temperature in thebattery.

Description

technical field [0001] The invention belongs to the technical field of batteries, and relates to a protective film, a preparation method thereof and a lithium ion battery using the protective film. Background technique [0002] Because of its high energy density, stable working voltage, long cycle life and no memory effect, lithium batteries are widely used in consumer electronics, electric vehicles and energy storage base stations, and are considered to be the most promising chemical industry. One of the power sources. In recent years, with the popularization of portable electronic products (smart phones, digital cameras, notebook computers, etc.), the rapid growth of electric vehicles and the maturity of energy storage technology applications, the market demand for lithium batteries is increasing day by day. The development of high reliability, long life, Low-cost lithium batteries are the general trend. [0003] At present, with the development of technology and the dev...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/02H01M10/0525H01M10/613H01M10/653H01M10/654
CPCH01M10/0525H01M10/613H01M10/653H01M10/654Y02E60/10
Inventor 赵生荣谭明胜
Owner HUBEI JINQUAN NEW MATERIALS CO LTD
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