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A heating film for low-temperature lithium-ion battery and its preparation method and application

A lithium-ion battery and heating film technology, which is applied in the field of lithium-ion batteries, can solve the problems of easily damaged batteries due to heating, and the low-temperature performance of lithium-ion batteries cannot be played normally, so as to achieve good heating effect, avoid capacity decay, and high heat exchange efficiency Effect

Active Publication Date: 2021-11-23
JIANGXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the above-mentioned problems existing in the prior art, the present invention provides a heating film for a low-temperature lithium-ion battery and its preparation method and application, which can quickly prepare a heating film with a room temperature PTC effect and apply it to a lithium-ion battery , the battery is heated by the built-in heating film of the battery, which can quickly increase the temperature of the battery, effectively solving the problems that the low-temperature performance of the lithium-ion battery cannot be normally exerted and the battery is easily damaged by heating.

Method used

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  • A heating film for low-temperature lithium-ion battery and its preparation method and application
  • A heating film for low-temperature lithium-ion battery and its preparation method and application
  • A heating film for low-temperature lithium-ion battery and its preparation method and application

Examples

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Embodiment 1

[0028] A heating film for a low-temperature lithium-ion battery, the preparation method of which comprises the following steps:

[0029] (1) Add nano-nickel powder into the titanate coupling agent to obtain mixture 1, then mix mixture 1 and low-density polyethylene to obtain mixture 2, and then heat mixture 2 to a molten state at 180°C and stir , to obtain a melt; titanate coupling agent volume accounts for 1% of the nano-nickel powder volume, and the nano-nickel powder volume accounts for 10% of the mixture two volumes (i.e. low density polyethylene and nano-nickel powder volume ratio is 90:10);

[0030] (2) Press the melt obtained in step (1) into a film with a thickness of 1 mm in a hot press molding machine or a hot roll molding machine under the conditions of 150 ° C and 0.6 MPa. Before molding, it is necessary to apply a layer of mold release in the molding mold agent, heat treatment at 120°C for 30 minutes, and cool at room temperature to obtain a heating film for low-t...

Embodiment 2

[0033] A heating film for a low-temperature lithium-ion battery, the preparation method of which comprises the following steps:

[0034] (1) Add nano-silver powder into the titanate coupling agent to obtain mixture 1, then mix mixture 1 and low-density polyethylene to obtain mixture 2, then heat mixture 2 to a molten state at 170° C. and stir, Obtain molten body; Titanate coupling agent volume accounts for 1% of nano-silver powder volume, and nano-silver powder volume accounts for 15% of mixture two volumes (that is low density polyethylene and nano-silver powder volume ratio are 85:15);

[0035] (2) Press the melt obtained in step (1) into a film with a thickness of 1.1mm in a hot press molding machine or a hot roll molding machine under the conditions of 130°C and 0.5MPa. The molding agent is then heat-treated at 110° C. for 25 minutes, and cooled at room temperature to obtain a heating film for a low-temperature lithium-ion battery.

Embodiment 3

[0037] A heating film for a low-temperature lithium-ion battery, the preparation method of which comprises the following steps:

[0038] (1) Add nano-carbon powder into the titanate coupling agent to obtain mixture 1, then mix mixture 1 and polypropylene to obtain mixture 2, and then heat mixture 2 to a molten state at 200°C and stir to obtain Melt body; the volume of titanate coupling agent accounts for 3% of the volume of nano-carbon powder, and the volume of nano-carbon powder accounts for 12% of the volume of the mixture (that is, the volume ratio of polypropylene and nano-carbon powder is 88:12);

[0039] (2) Press the melt obtained in step (1) into a film with a thickness of 0.8mm in a thermocompression molding machine or a hot roll molding machine under the conditions of 160°C and 0.7MPa. The molding agent is then heat-treated at 100° C. for 40 minutes, and cooled at room temperature to obtain a heating film for a low-temperature lithium-ion battery.

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Abstract

The invention provides a heating film for a low-temperature lithium-ion battery and its preparation method and application. The preparation method includes the following steps: adding a conductive substance into a titanate coupling agent to obtain a mixture 1, and then mixing the mixture 1 with a polymer matrix mixing to obtain mixture 2, and then heating the mixture 2 to a molten state and stirring to obtain a molten body; pressing the molten body into a film, then heat-treating, and cooling at room temperature to obtain a heating film for a low-temperature lithium-ion battery. The invention also includes the heating film prepared by the above method and its application. The invention can quickly prepare a heating film with a room temperature PTC effect, and apply it to a lithium-ion battery, and heat the battery through the built-in heating film of the battery, which can quickly increase the temperature of the battery, effectively solving the problem of low-temperature performance of the lithium-ion battery. Normal performance and easy damage to the battery due to heating.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a heating film for a low-temperature lithium-ion battery and a preparation method and application thereof. Background technique [0002] Lithium-ion batteries are currently widely used secondary batteries, but they are sensitive to operating temperature, especially when used below 0°C, the battery capacity decays seriously and cannot be used normally. At present, the main method to solve this problem is to improve the low-temperature performance of the battery through the coating of the battery material, the adjustment of the material structure, and the adjustment of the electrolyte. However, there is still a relatively large difference between the normal temperature performance and low temperature performance of the battery, which cannot fundamentally solve the problem of normal use of lithium-ion batteries at low temperatures. [0003] Another way is ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/615H01M10/637H01M10/654H01M10/0525H05B3/14C08L23/06C08L23/12C08L27/18C08K9/04C08K3/08C08K3/04C08J5/18
CPCC08J5/18C08J2323/06C08J2323/12C08J2327/18C08K3/04C08K9/04C08K2003/0806C08K2003/0862C08K2201/001C08K2201/011C08K3/041H01M10/0525H05B3/14H01M10/615H01M10/637H01M10/654Y02E60/10
Inventor 张骞兰超波钟盛文丁能文陈军
Owner JIANGXI UNIV OF SCI & TECH
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