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A method for demagnetizing metal impurity particles on the surface of lithium battery electrode sheets

A surface metal and electrode sheet technology, which is applied in the field of demagnetization of metal impurity particles on the surface of lithium battery electrode sheets, can solve the problems of battery short circuit, aggravated self-discharge, large self-discharge, etc., to reduce self-discharge, improve quality and consistency , the effect of improving the service life

Active Publication Date: 2022-02-18
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] There are two reasons for the large self-discharge during the manufacturing process: 1. During the production process, due to the production environment, some impurities will be introduced into the battery, such as dust, metal impurity particles in the slurry, and metal on the pole piece. Powder, etc.; 2. The burrs generated when cutting the pole piece, these substances may cause the internal micro-short circuit of the battery and aggravate the occurrence of self-discharge

Method used

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  • A method for demagnetizing metal impurity particles on the surface of lithium battery electrode sheets
  • A method for demagnetizing metal impurity particles on the surface of lithium battery electrode sheets
  • A method for demagnetizing metal impurity particles on the surface of lithium battery electrode sheets

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Experimental program
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Effect test

Embodiment 1

[0034] see figure 1 , the magnetic field transmitter is 30mm away from the A side of the electrode sheet, and the magnetic field transmitter of the permanent magnet is used to generate a 6000GS magnetic field to act on the A side of the electrode sheet. There are 3 rows, and the distance between the probe and the surface B of the electrode sheet is 2mm.

[0035] During the detection process of electrode sheet movement, the Hall sensor detects that the magnetic size in the grid surrounded by (2,3)(2,4)(3,3)(3,4) coordinate points is 11GS, and this area The surrounding magnetic size is 1.8GS. When the electrode sheet in this area is transported to the adsorption demagnetization system, the closed cover will seal the grid, and the air blowing part will blow out compressed air from the air outlet to blow the magnetic metal impurity particles in the grid. At the same time, the adsorption part above generates negative pressure, so as to absorb and remove the magnetic metal impurity...

Embodiment 2

[0037]The magnetic field transmitter is 20mm away from the A side of the electrode sheet. The magnetic field transmitter of the electromagnetic coil generates a magnetic field of 8000GS to act on the A side of the electrode sheet. The distance between the probe and the surface B of the electrode sheet is 6mm.

[0038] During the detection process of the electrode sheet movement, the Hall sensor detects that the magnetic size in the two grids surrounded by (2,1)(2,2)(4,1)(4,2) coordinate points is 13GS, while The magnetic field around this area is 2.5GS. When the electrode sheet in this area is transported to the adsorption demagnetization system, the closed cover is first surrounded by (3,1)(3,2)(4,1)(4,2) coordinate points The formed grid is closed, the blowing part blows air, and the adsorption part absorbs; then the closed cover rises and moves to the grid formed by (2,1)(2,2)(3,1)(3,2) coordinate points The grids are sealed, and then blown and adsorbed, thus completing th...

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Abstract

The invention discloses a demagnetization method for metal impurity particles on the surface of a lithium battery electrode sheet. The demagnetization is carried out through a conveying system, a magnetic field emission system, a magnetic field detection system, and an adsorption demagnetization system, comprising the following steps: Transportation, the magnetic field emission system generates a magnetic field to act on one side of the electrode sheet, the magnetic field detection system detects the magnetic field on the other side of the electrode sheet, and transmits the position information of the detected magnetic abnormality area on the electrode sheet to the adsorption demagnetization system, and the transportation system The electrode sheet is transferred to the adsorption demagnetization system, and the adsorption demagnetization system performs adsorption and demagnetization on the metal impurity particles on the electrode sheet according to the received position information. The invention realizes the demagnetization of the metal impurity particles on the surface of the electrode sheet through the mutual cooperation of the conveying system, the magnetic field emission system, the magnetic field detection system and the adsorption demagnetization system.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries, in particular to a method for demagnetizing metal impurity particles on the surface of lithium battery electrode sheets. Background technique [0002] Lithium-ion batteries have the advantages of high working voltage, high energy density, small size, large capacity, long cycle life, no memory effect and no pollution, and are widely used in portable consumer electronics such as MP3, smart phones, notebook computers, and digital cameras ; With the reduction of battery cost and the further improvement of life and reliability, electric vehicles and energy storage are expected to become the largest application fields of lithium-ion batteries in the future. After single batteries are grouped in series and parallel, they can be used as power modules. In electric vehicles; each battery in the module must ensure good consistency, otherwise there will be phenomena such as overcharging and dischar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/139H01M4/04H01M10/058H01M10/052B08B5/02B08B15/04
CPCH01M4/139H01M4/04H01M10/058H01M10/052B08B5/026B08B15/04Y02E60/10Y02P70/50
Inventor 刘中奎陈萌张秀丽吴洋洋陈默武行兵
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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