Heating film for low-temperature lithium ion battery and preparation method and application of heating film

A technology of lithium ion battery and heating film, applied in the field of lithium ion battery, can solve the problems of easy damage of battery heating, low temperature performance of lithium ion battery can not be performed normally, etc., achieves good heating effect, avoids capacity decay, and protects the effect of battery

Active Publication Date: 2020-12-11
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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  • Heating film for low-temperature lithium ion battery and preparation method and application of heating film
  • Heating film for low-temperature lithium ion battery and preparation method and application of heating film
  • Heating film for low-temperature lithium ion battery and preparation method and application of heating film

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 a preparation method and application of the heating film. The preparation method comprises the following steps: adding a conductive substance into a titanate coupling agent to obtain a mixture I, mixing the mixture I with a polymer matrix to obtain a mixture II, heating the mixture II to a molten state, and stirring to obtain a melt; and pressing the melt into a film, carrying out heat treatment, and cooling at room temperature to obtain the heating film for the low-temperature lithium ion battery. The invention also comprises the heating film prepared by the method and application thereof. The heating film with the room-temperature PTC effect can be rapidly prepared and applied to the lithium ion battery,the battery is heated through the heating film arranged in the battery, the temperature of the battery can be rapidly increased, and the problems that the low-temperature performance of the lithium ion battery cannot be normally exerted, the battery is easily damaged during heating and the like are effectively solved.

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 Applications(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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