Lithium ion power battery with high safety performance

A power battery and safety performance technology, applied in secondary batteries, battery pack components, circuits, etc., can solve the problems of diaphragm shrinkage, large power battery energy, and increased heat, so as to reduce heat generation and improve battery safety performance. , the effect of preventing contact

Active Publication Date: 2016-04-06
WANXIANG 123 CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the energy of the power battery is large. After the diaphragm is closed, the temperature of the battery will continue to rise beyond the melting point of the diaphragm, the diaphragm will shrink, the positive and negative electrodes will be short-circuited, and the heat will be aggravated, and the battery will catch fire or explode.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Prepare PTC double-sided coated aluminum foil (PTC-coated aluminum foil current collector): mix 88 parts by weight of PTC powder, 4 parts by weight of carbon black ECP, 8 parts by weight of polyvinylidene fluoride (PVDF), and add 200 parts by weight of N-N-dimethylpyrrolidone is stirred to form a slurry, evenly coated on both sides on the aluminum foil, and dried to make a PTC-coated aluminum foil, wherein the thickness of the coating on one side is 1 micron.

[0033] Preparation of positive electrode sheet: high nickel ternary material (Ni 0.6 co 0.2 mn 0.2 o 2 ) is the positive electrode active material, and the formula and production process are the same as in Comparative Example 1 to make the positive electrode sheet.

[0034] Prepare a double-sided ceramic coating diaphragm: the diaphragm uses polyethylene (PE) with a thickness of 16 microns as the base film, and is coated with 4.5 micron alumina ceramics on both sides, with an air permeability of 196 cm 3 / sec...

Embodiment 2

[0037] Prepare PTC double-sided coated aluminum foil (PTC-coated aluminum foil current collector): mix 70 parts by weight of PTC powder, 15 parts by weight of carbon black SP, 15 parts by weight of polyvinylidene fluoride (PVDF), and add 350 parts by weight of N-N-dimethylpyrrolidone is stirred to form a slurry, evenly coated on both sides on the aluminum foil, and dried to make a PTC-coated aluminum foil, wherein the thickness of the coating on one side is 2 microns.

[0038] Preparation of positive electrode sheet: high nickel material (Ni 0.8 co 0.15 Al 0.05 o 2 ) is the positive electrode active material, and the formula and production process are the same as in Comparative Example 1 to make the positive electrode sheet.

[0039] Prepare a double-sided ceramic coated diaphragm: the diaphragm is made of polypropylene (PP) with a thickness of 20 microns as the base film, coated with 5 micron alumina ceramics on both sides, and the air permeability is 306cm 3 / sec, porosity...

Embodiment 3

[0042] Prepare PTC double-sided coated aluminum foil (PTC-coated aluminum foil current collector): mix 80 parts by weight of PTC powder, 8 parts by weight of carbon black SP, 12 parts by weight of polyvinylidene fluoride (PVDF), and add 300 parts by weight of N-N-dimethylpyrrolidone is stirred to form a slurry, evenly coated on both sides on the aluminum foil, and dried to make a PTC-coated aluminum foil, wherein the thickness of the coating on one side is 1.5 microns.

[0043] Preparation of positive electrode sheet: high nickel material (Ni 0.8 co 0.1 mn 0.1 o 2 ) is the positive electrode active material, and the formula and production process are the same as in Comparative Example 1 to make the positive electrode sheet.

[0044] Prepare a double-sided ceramic coated diaphragm: the diaphragm uses polypropylene (PP) with a thickness of 12 microns as the base film, and is coated with 5 micron alumina ceramics on both sides, with an air permeability of 184 cm 3 / sec, poros...

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Abstract

The invention relates to the technical field of a lithium ion battery, in particular relates to a lithium ion power battery with high safety performance. The lithium ion power battery comprises a positive pole piece, a diaphragm, a negative pole piece, an electrolyte, an external connection terminal and a shell, wherein the positive pole piece comprises a positive temperature coefficient (PTC) aluminum foil current collector and a high-nickel positive electrode material, the double surfaces of the PTC aluminum foil current collector are coated with PTC coatings, the high-nickel positive electrode material is coated on the surface of the current collector, and the diaphragm is a double-sided ceramic coating diaphragm. A fabrication method of the positive pole piece comprises the following steps of firstly, mixing all constitutes of a PTC material, a conductive agent, a binding agent and a solvent which serve as raw materials of the PTC coatings to prepare a paste; secondly, uniformly applying the paste on the double surfaces of an aluminum foil and drying the paste to obtain the PTC aluminum foil current collector; and finally, uniformly applying the high-nickel positive electrode material paste on the PTC aluminum foil current collector, and then carrying out roasting, grinding, slitting and roasting to obtain the positive pole piece.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a lithium-ion power battery with high safety performance. Background technique [0002] With the market demand, electric vehicles put forward higher requirements on the safety performance of single batteries. At present, the method to improve the safety performance of batteries is mainly to add flame retardant additives to the electrolyte, or to use PP, PE, PP-PE-PP ceramic single-sided coating separators. The safety performance is improved by adding flame retardant additives to the electrolyte, but the conductivity of the electrolyte decreases, which affects the discharge performance of the battery. PP, PE, PP-PE-PP coated separators are used to effectively increase the safety of the battery, but the melting point of conventional PP, PE, PP-PE-PP separators is about 130 ° C ~ 160 ° C, after coating treatment Afterwards, the melting point rises to about 180°C, and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/66H01M2/16H01M10/0525H01M50/434H01M50/451H01M50/457
CPCY02E60/10
Inventor 吕豪杰金荣在李青柱高新宝
Owner WANXIANG 123 CO LTD
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