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A safe lithium ion power battery

A power battery and lithium-ion technology, which is applied in the field of safe lithium-ion power batteries, can solve problems such as inability to effectively avoid contact short circuits, and achieve the effect of improving safety performance

Inactive Publication Date: 2016-12-21
XIAMEN RIZHEN POWER TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the use of ceramic diaphragms can reduce the contact short circuit in the coating area of ​​the pole piece to a certain extent, it cannot effectively avoid the contact short circuit between the positive tab and the negative tab, and the contact short circuit between the tab and the shell.

Method used

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  • A safe lithium ion power battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Preparation of tab-coated positive electrode sheet: After the positive electrode sheet prepared according to the comparative example is completed, aluminum oxide coating is applied to the positive electrode tab with a coating thickness of 4-8 μm, and the coated area is the positive electrode current collector tab . The alumina coating is composed of the following components by mass percentage: 10-30% binder L132, 70-90% alumina particles;

[0029] Preparation of PET-coated negative electrode sheet: After the positive electrode sheet prepared according to the comparative example is completed, a PTC coating with a thickness of 3 μm is coated again on the negative electrode coating area. The position of the PTC coating is exactly the same as that of the negative electrode coating area. The PTC coating is composed of the following components by mass percentage: 65-92% of PTC material, 3-20% of conductive carbon black and 5-15% of polyvinylidene binder;

[0030] Preparation...

Embodiment 3

[0036] The difference from Example 2 is that the thickness of the negative electrode PET coating is 5 microns, and the others are the same as in Example 2, and will not be repeated here.

Embodiment 4

[0038] The difference from Example 2 is that the thickness of the positive electrode lug coating is 3 microns, and the others are the same as in Example 2, and will not be repeated here.

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Abstract

The invention relates to a safe lithium ion power battery. The safe lithium ion power battery comprises a shell. A cathode sheet, an anode sheet and a separating membrane are disposed in the shell. A current collector lug of the cathode sheet is coated with an alumina coating. An anode active compound coating zone of the anode sheet is coated with a PET layer. The separating membrane is a two-sided polymer microsphere separating membrane. The cathode sheet, the anode sheet and the separating membrane form a battery core. The outermost layer of the battery core is coated with a PPT layer. Through a manner of adopting a plurality of the coatings, short circuits caused by contact between the cathode and the anode and contact between the shell and the battery core are avoided, and safety performance of the battery is improved under the premise of not influencing chemical properties of the battery.

Description

technical field [0001] The invention relates to a lithium battery, in particular to a safe lithium ion power battery. Background technique [0002] Due to the advantages of high energy density, small size, no memory effect, small self-discharge, and long cycle life, lithium-ion batteries are used as power batteries in electric vehicles, energy storage, and military industries. However, during the preparation, use or packing process of lithium-ion batteries, the positive and negative tabs, the battery cell and the shell, the shell and the tabs are prone to contact with each other when the lithium-ion battery is subjected to external forces, causing a short circuit inside the battery and causing the battery to catch fire. , Explosion and other safety hazards restrict the further popularization and application of power lithium-ion batteries. [0003] At present, PE separators with ceramic coating are usually used to improve battery safety performance. This type of diaphragm h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/058H01M4/70
CPCH01M4/70H01M10/058Y02E60/10Y02P70/50
Inventor 袁万颂
Owner XIAMEN RIZHEN POWER TECH CO LTD
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