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A kind of ptc film and its preparation method and thermistor

A technology of PTC and thin film, which is applied in the field of PTC thin film and its preparation method and thermistor, can solve the problems of low lithium battery protection, high transition temperature, etc., and achieve simple manufacturing process, good thermal effect, and improved phase capacitive effect

Active Publication Date: 2021-05-25
DALIAN CBAK POWER BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the PTC materials used in lithium batteries are mainly based on a single polyethylene polymer, and carbon black is added to it as a conductive agent. Its NTC effect is obvious (that is, its resistance value decreases with the increase of temperature after exceeding a certain temperature), and this type of PTC material cannot play a good role in protecting lithium batteries.

Method used

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  • A kind of ptc film and its preparation method and thermistor
  • A kind of ptc film and its preparation method and thermistor
  • A kind of ptc film and its preparation method and thermistor

Examples

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Effect test

Embodiment 1

[0036] The present embodiment provides a kind of PTC thin film, and its preparation formula is as follows:

[0037] The mass fraction is 35% molten high impact polystyrene HIPS, 15% molten polyethylene HDPE or (polypropylene PP, polyvinylidene fluoride PVDF), 15% carbon black, 10% nickel powder, 20% oxidation Aluminum, 2.5% coupling agent titanate, 2.5% grafting reagent maleic anhydride.

Embodiment 2

[0039] The present embodiment provides a kind of PTC thin film, and its preparation formula is as follows:

[0040] The mass fraction is 30% molten high impact polystyrene HIPS, 10% molten polyethylene HDPE or (polypropylene PP, polyvinylidene fluoride PVDF), 10% polymethyl methacrylate PMMA, 15% carbon Black, 10% nickel powder, 20% alumina, 2.5% coupling agent titanate, 2.5% grafting agent maleic anhydride.

Embodiment 3

[0042] This embodiment provides a kind of PTC thin film and preparation method thereof, and specific steps are as follows:

[0043] The mass fraction is 35% molten high impact polystyrene HIPS, 15% molten polystyrene PS, 10% polymethyl methacrylate PMMA, 20% carbon black, 5% nickel powder, 10% aluminum oxide , 2.5% coupling agent titanate, and 2.5% grafting reagent maleic anhydride are mixed and then stirred at high speed.

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Abstract

The invention relates to the field of a thermistor and a manufacturing method thereof, in particular to a PTC film, a preparation method thereof and a thermistor. A kind of PTC film, its preparation raw material comprises macromolecule polymer, and described macromolecule polymer comprises: polystyrene HIPS 30-40 parts by weight, polyethylene HDPE, polypropylene PP, polystyrene PS or polystyrene 10-20 parts of one or several kinds of vinylidene fluoride PVDF. The present invention uses two or three organic substances with different melting points as substrates, and when the temperature of the lithium battery rises, double percolation occurs in the PTC material. This process can improve the repeatability of the resistance of the PTC material and weaken the NTC effect. When the lithium battery suffers from thermal runaway such as short circuit or overcharging, the resistance value of its PTC material will increase with the increase of temperature until the internal current is completely blocked, so as to avoid safety accidents such as fire and explosion.

Description

technical field [0001] The invention relates to the field of a thermistor and a manufacturing method thereof, in particular to a PTC film, a preparation method thereof and a thermistor. Background technique [0002] With the rapid development of new energy vehicles, the entire industry has higher and higher requirements for the energy density of lithium batteries. However, with the improvement of energy density, the safety of lithium batteries has also been paid more and more attention. Once the lithium battery is operated under abuse, such as short circuit, overcharge, etc., a series of side reactions will occur inside the battery, and a large amount of heat will be generated at the same time, which will cause safety problems. [0003] In order to prevent the battery from generating a large amount of heat in a short period of time when the battery is overcharged or short-circuited, many battery factories need to install a thermal device (PTC) inside or outside the battery. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L51/04C08L23/06C08L23/12C08L27/16C08L33/12C08L25/06C08K13/02C08K3/04C08K3/08C08K3/22C08K5/10C08J5/18H01C7/02
CPCC08J5/18C08J2351/04C08J2423/06C08J2423/12C08J2425/06C08J2427/16C08J2433/12C08K3/04C08K5/10C08K13/02C08K2003/0862C08K2003/2227H01C7/028
Inventor 高强薄晋科宫颂王元杰
Owner DALIAN CBAK POWER BATTERY CO LTD