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Composite thermistor material, thermistor, thermosensitive lug and lithium-ion battery

A thermistor and tab technology, applied in the field of composite thermistor materials, can solve problems such as protection, affecting battery rate performance and cycle performance, and soft pack batteries cannot pass the overcharge test.

Active Publication Date: 2018-10-02
HUNAN FENGYUAN YESHINE KINGCO NEW ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, the pouch battery has no protection against overcharging at all, so that the pouch battery basically cannot pass the overcharge test.
Some batteries add PTC thermistor to increase the overcharge safety performance of the battery, but the conventional PTC thermistor material has a serious disadvantage: it affects the rate performance and cycle performance of the battery. Therefore, it is necessary to find a more effective method. It can not only meet the requirements of the overcharge safety performance of the pouch battery, but also meet the requirements of improving the battery rate performance and cycle performance

Method used

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  • Composite thermistor material, thermistor, thermosensitive lug and lithium-ion battery
  • Composite thermistor material, thermistor, thermosensitive lug and lithium-ion battery
  • Composite thermistor material, thermistor, thermosensitive lug and lithium-ion battery

Examples

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Embodiment 1

[0072] The invention provides a PTC thermistor containing C60 fullerene, which is composed of two layers of metal foil (aluminum) and a sheet-shaped PTC core material is sandwiched inside. The PTC core material is composed of PTC material, additives, and C60 fullerene. Composition, the parts by weight of each core material raw material are composed as follows:

[0073] PTC material: 70wt%; PTC material is barium titanate;

[0074] Auxiliary agent: 25wt% (auxiliary agent comprises: 5 parts by weight of coupling agent (silane coupling agent), 3 parts by weight of flame retardant (aluminum hydroxide), 3 parts by weight of antioxidant (dilauryl thiodipropionate) , antioxidant (4,4 '-dithiodimorpholine) 3 parts by weight, accelerator (zinc dimethyl dithiocarbamate) 4 parts by weight, crosslinking agent (N N'-methylenebispropylene Amide) 3 parts by weight, dispersant (sodium methylene bis-naphthalene sulfonate) 4 parts by weight);

[0075] C60 fullerene: 5 wt%.

[0076] The prepa...

Embodiment 2

[0087] The invention provides a PTC thermistor containing C60 fullerene, which is composed of two layers of metal foils with a sheet-shaped PTC core material sandwiched inside. The PTC core material is composed of PTC materials, additives, and C60 fullerene. The weight part composition of core material raw material is as follows:

[0088] PTC material: 60wt%; PTC material is iron powder (20wt%), copper powder (20wt%), titanium dioxide (20wt%);

[0089]Auxiliary agent: 30wt% (auxiliary agent comprises: coupling agent (silane coupling agent) 6 weight parts, flame retardant (aluminum hydroxide) 4 weight parts, antioxidant (dilauryl thiodipropionate) 3 weight parts , 4 parts by weight of antioxidant (4,4'-dithiodimorpholine), 4 parts by weight of accelerator (zinc dimethyldithiocarbamate), cross-linking agent (N N'-methylenebispropylene Amide) 4 parts by weight, dispersant (sodium methylene bis-naphthalene sulfonate) 5 parts by weight);;

[0090] C60 fullerene: 10 wt%.

[0091]...

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Abstract

The invention belongs to the field of lithium battery materials and particularly discloses a composite thermistor material. The composite thermistor material is characterized by comprising a fullerenematerial, a PTC material and an assistant. The invention further provides a thermistor compounded with the composite thermistor material, a thermosensitive lug assembled by the thermistor and a lithium-ion battery assembled by the thermosensitive lug. The inventor accidentally finds that the performance can be collaboratively improved through combined use of the fullerene material and the PTC material through a large number of studies. The lithium-ion battery with excellent overcharge resistance can be obtained through applying the lug provided by the invention into assembly of the lithium-ion battery; and especially a PTC thermistor containing the fullerene material is added between lugs of a soft package battery, so that the internal resistance of the whole battery can be reduced through reducing the room-temperature internal resistance rate of a PTC, and the overcharge performance of the soft package lithium-ion battery can be effectively improved to enhance the safety performanceof the battery.

Description

technical field [0001] The invention belongs to the field of lithium-ion battery materials, and in particular relates to a composite thermistor material, including the thermistor of the composite material, tabs and lithium-ion batteries. Background technique [0002] In recent years, with the depletion of oil resources and the seriousness of environmental pollution, industrialized countries are speeding up their search for alternative energy sources. Lithium-ion batteries have also attracted people's attention due to their advantages such as high specific energy, long cycle life, no memory effect, and wide operating temperature range. [0003] However, the main obstacle currently restricting the application of lithium-ion batteries is the safety of batteries, that is, batteries are prone to unsafe behaviors such as explosion or combustion under abuse conditions such as overcharge, short circuit, puncture, extrusion, and high temperature thermal shock. Among them, overchargi...

Claims

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Application Information

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IPC IPC(8): H01C7/02H01M2/26H01M10/0525H01M10/058H01M50/531
CPCH01M10/0525H01M10/058H01C7/022H01C7/023H01C7/025H01C7/026H01M50/531Y02E60/10Y02P70/50
Inventor 伍文罗青彭微微
Owner HUNAN FENGYUAN YESHINE KINGCO NEW ENERGY
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