A kind of composite thermistor material, thermistor, thermosensitive tab and lithium ion battery

A thermistor and tab technology, which is applied in the field of composite thermistor materials, can solve the problems of soft pack batteries failing to pass the overcharge test, affecting the battery rate performance and cycle performance, and protection.

Active Publication Date: 2020-09-08
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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  • A kind of composite thermistor material, thermistor, thermosensitive tab and lithium ion battery
  • A kind of composite thermistor material, thermistor, thermosensitive tab and lithium ion battery
  • A kind of composite thermistor material, thermistor, thermosensitive tab and lithium ion battery

Examples

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Effect test

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: 6 parts by weight of coupling agent (silane coupling agent), 4 parts by weight of flame retardant (aluminum hydroxide), 3 parts by weight of antioxidant (dilauryl thiodipropionate) , 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:...

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Abstract

The invention belongs to the field of lithium battery materials, and specifically discloses a composite thermistor material, which is characterized in that it includes a fullerene material, a PTC material and an auxiliary agent. The present invention also provides a thermistor compounded with the composite thermistor material; a heat-sensitive electrode lug assembled from the thermistor and a lithium ion battery assembled by the heat-sensitive electrode lug. The inventors have unexpectedly discovered through extensive research that the composite use of fullerene materials and PTC materials can synergistically improve performance. By applying the tabs of the present invention to the assembly of lithium-ion batteries, a lithium-ion battery with excellent anti-overcharge performance can be obtained; The resistance can not only reduce the internal resistance of the entire battery by reducing the room temperature internal resistivity of the PTC, but also effectively improve the overcharge performance of the soft-pack lithium-ion battery to enhance the safety performance of 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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Patent Type & Authority Patents(China)
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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