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Diaphragm for lithium ion battery and lithium ion battery

A technology of lithium-ion batteries and diaphragms, which is applied in secondary batteries, battery pack components, secondary battery repair/maintenance, etc. It can solve problems such as fire and the inability to quickly and efficiently block battery heat, and improve safety performance. Guarantee the effect of repeated use and high safety performance

Inactive Publication Date: 2021-05-07
惠州锂威电子科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a diaphragm for lithium-ion batteries to solve the current problem that the heat in the battery cannot be quickly and efficiently blocked; the diaphragm of the present invention can quickly cut off the positive and negative electrodes to prevent short circuits, thereby improving Battery safety performance, to avoid battery fire, explosion

Method used

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  • Diaphragm for lithium ion battery and lithium ion battery
  • Diaphragm for lithium ion battery and lithium ion battery
  • Diaphragm for lithium ion battery and lithium ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Such as Figure 1~3 As shown, a separator for lithium ion batteries includes a base film 1 and a first coating 2; the first coating 2 is coated on at least one surface of the base film 1; the first coating 2 includes an additive 21; wherein the additive 21 is a core-shell structure, the core material 211 is at least one of azobisisobutyronitrile, azodicarbonamide, diisopropyl azodicarboxylate azobenzene, and the shell material 212 is an elastic material. The coating method of the base film 1 and the first coating layer 2 can be any one of dimple coating, vapor deposition, spin spraying and dip coating, preferably dimple coating.

[0029] Further, the shell material 212 is at least one of acrylonitrile, methacrylonitrile and methacrylate. These substances are used as the shell material 212, which has good elastic function, and good performance will not affect the performance of the battery. After the core material 211 is heated and expanded, the good elasticity of the s...

Embodiment 2

[0040] A lithium-ion battery, comprising a cell made of a positive electrode, a separator and a negative electrode, the separator being the separator described in Example 1. In this embodiment, the active material of the positive electrode sheet is lithium cobaltate, and the active material of the negative electrode sheet is artificial graphite. By sequentially completing the positive and negative electrode material slurry stirring, coating, rolling, slitting, winding and top sealing processes, Assemble into a soft-pack lithium battery, and then put the soft-pack lithium battery in a vacuum oven at 80°C for 12 to 24 hours; when the mixed water content of the negative electrode sheet of the bare cell is less than 150ppm, the soft-pack lithium battery is automatically injected, After standing still at high temperature, negative pressure formation, sealing welding, volume separation, testing and other processes, the soft-packed lithium-ion battery is finally obtained.

[0041] Th...

Embodiment 3

[0045] The difference from Example 2 is the setting of the additive 21 in the diaphragm. The mass of the inner core material 211 of the diaphragm additive 21 in this embodiment is 20% of the mass of the additive 21; the mass of the shell material 212 is 80% of the mass of the additive 21.

[0046] The rest are the same as in Embodiment 2, and will not be repeated here.

[0047] The lithium-ion battery obtained above was tested, and the temperature inside the battery was raised to 80, 100, and 200°C respectively, and the thickness of the separator was measured by a single X-ray, and it was found that the thickness of the separator could expand to 4 times at 80°C , it can expand to 8 times at 100°C, and rapidly expand to 10 times at 200°C, and the diaphragm shrinks back to its original thickness after the temperature drops.

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Abstract

The invention provides a diaphragm for a lithium ion battery. The diaphragm comprises a base membrane, a first coating, a first coating coats at least one surface of the base film; the first coating comprises an additive; the additive is of a core-shell structure, a core material is at least one of azodiisobutyronitrile, azodicarbonamide and diisopropyl azodicarboxylate azobenzene, and a shell material is an elastic material. Compared with the prior art, the additive with the core-shell structure is added into the coating of the diaphragm; according to the additive, the azodiisobutyronitrile, azodicarbonamide, diisopropyl azodicarboxylate azobenzene and other substances are adopted as the core material, and after the heat of the battery is increased, the core material substances are heated to expand, and therefore, a positive electrode and a negative electrode are separated in a volume expansion manner, the risks of fire and explosion caused by internal short circuit of the battery are reduced, and the safety performance of the battery is improved.

Description

technical field [0001] The invention relates to the field of lithium batteries, in particular to a diaphragm for lithium ion batteries and a lithium ion battery. Background technique [0002] Due to its high working voltage, high specific energy, long cycle life, environmental friendliness and no memory effect, lithium-ion batteries have been widely used in 3C digital consumer electronics products, such as notebook computers, smart phones and tablet computers. Wide range of applications. Especially in recent years, the sudden emergence of the electric vehicle market has provided a broader market prospect for the development of lithium-ion batteries. However, there have also been many safety accidents, such as smoke, fire, and even explosion of electric vehicle batteries. These safety accidents may affect property and personal safety. Therefore, the requirements for the safety performance of lithium batteries cannot be taken lightly. The separator is an important part of t...

Claims

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Application Information

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IPC IPC(8): H01M50/449H01M50/411H01M10/0525H01M10/42
CPCH01M10/0525H01M10/4235Y02E60/10
Inventor 晋沛沛孙先维赖旭伦杨山陈杰
Owner 惠州锂威电子科技有限公司
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