Tail aluminum foil treatment method for improving safety test of lithium ion battery

A lithium-ion battery, safety testing technology, applied in the manufacture of battery electrodes, secondary batteries, electrolyte batteries, etc., can solve problems such as thermal runaway, and achieve the effect of preventing direct contact and not easy to peel off

Pending Publication Date: 2022-02-25
HUIZHOU LIWINON NEW ENERGY TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to: aim at the deficiencies of the prior art, to provide a tail aluminum foil treatment method for improving the safety test of lithium-ion ba

Method used

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  • Tail aluminum foil treatment method for improving safety test of lithium ion battery

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Embodiment approach

[0035] Tail foil treatments for improved safety testing of lithium-ion batteries, including:

[0036] Step 1, oxidizing the surface of the metal foil 1 at the tail of the short film surface of the cathode sheet;

[0037] Step 2, coating the slurry of the safety coating 3 on the surface of the metal foil 1, and then baking;

[0038] Step 3, coating the cathode active material slurry 4 on the surface of the safety coating 3, and then baking;

[0039] Step 4: Carry out rolling, slitting, winding, and top-side sealing of the baked cathode sheet to form a battery cell.

[0040] It should be noted that: in the existing structure, the ceramic coating has a certain thickness, resulting in the loss of energy density of the cell; at the same time, the ceramic coating is easy to peel off during the process of acupuncture and foreign matter extrusion, resulting in the exposure of the aluminum foil and the negative electrode active material. A short circuit occurs at the end of the conta...

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Abstract

The invention belongs to the technical field of batteries, and particularly relates to a tail aluminum foil treatment method for improving the safety test of a lithium ion battery. The method comprises the following steps: 1, oxidizing the surface of a metal foil at the tail of a short film surface of a cathode plate; 2, coating the surface of the metal foil with the slurry of the safety coating, and then performing performing baking; 3, coating the surface of the safety coating with the cathode active substance slurry, and then performing baking; 4, carrying out rolling, slitting, winding and top side sealing on the baked cathode sheet to form a battery cell. The problem of thermal runaway caused by positive and negative electrode short circuit in the needling process of the battery can be improved, and the safety of the battery can be improved.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a tail aluminum foil treatment method for improving the safety test of lithium-ion batteries. Background technique [0002] Lithium-ion batteries are widely used in electric vehicles and other power fields, as well as mobile phones, watches, tablets, Notebook and other consumer fields. With the gradual development of lithium-ion batteries in fields such as fast charging and high energy density, the safety issues brought about by batteries have gradually become the focus of everyone's attention. Lithium-ion battery drop test is the direction that everyone is paying attention to. [0003] Lithium-ion batteries will have four kinds of contact short circuits during acupuncture, foreign matter extrusion, etc., "positive active material and negative active material", "positive active material and negative current collector", "positive current collector and negative acti...

Claims

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Application Information

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IPC IPC(8): H01M4/139H01M10/0525H01M10/058
CPCH01M4/139H01M10/0525H01M10/058Y02E60/10Y02P70/50
Inventor 谭远高王铭雪徐春辉文豪陈杰杨山项海标
Owner HUIZHOU LIWINON NEW ENERGY TECH CO LTD
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