Three-electrode soft package battery and preparation method thereof

A soft-pack battery, three-electrode technology, which is applied in the manufacture of electrolyte batteries, non-aqueous electrolyte batteries, battery pack components, etc. Technical support and application prospects, the effect of improving technical support and application prospects, and improving stability and reliability

Active Publication Date: 2017-05-31
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, lithium is sensitive to oxygen and moisture and cannot be exposed to air
At present, in the research on the reference electrode of lithium batteries, there are direct purchase of lithium metal wires or lithium metal sheets placed between diaphragms as reference electrodes (Journal of Electroanalytical Chemistry 759 (2015) 91–94; Journal of Power Sources 111 (2002 ) 255–267), although this method is simple to operate, when the pure lithium metal wire/sheet is placed in the electrolyte as a reference electrode, lithium metal consumption or even dissolution may occur during long-term charge and discharge; and The reference electrode has only lithium and no other supporting metals are

Method used

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  • Three-electrode soft package battery and preparation method thereof
  • Three-electrode soft package battery and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0029] Such as figure 1 , 2 As shown, a three-electrode pouch battery includes a laminated battery packaged between an upper aluminum-plastic film 1.1 and a lower aluminum-plastic film 1.2, and the laminated battery includes a positive electrode coated pole piece 10, two layers of separators 9, The negative coated pole piece 8, the positive coated pole piece 10 is welded with the positive aluminum tab 3.1 through the current collector 11, the negative coated pole piece 8 is welded with the negative nickel tab 2 through the current collector 11, the two A copper mesh 5 is provided between the diaphragms 9, one end of the copper mesh 5 is covered with a lithium metal sheet 6, and the other end protrudes from the diaphragm 9 and is connected to the auxiliary aluminum tab 3.2.

[0030] In a further solution, one end of the positive electrode coated pole piece 10 and the negative electrode coated pole piece (8) is symmetrically provided with a blank area 7 not coated with slurry, ...

Embodiment 2

[0033] A preparation method for a three-electrode pouch battery, the steps of which are as follows:

[0034] (1) Apply positive electrode slurry on the positive electrode sheet to form a positive electrode coating electrode sheet 10, and reserve a blank area 7 at one end without applying positive electrode slurry; apply negative electrode slurry on the negative electrode sheet to form a negative electrode coating pole piece 8, and reserve a blank area 7 at one end thereof without coating negative electrode slurry;

[0035] (2) By ultrasonic welding, the positive aluminum tab 3.1 is welded to the positive coated pole piece 10 through the current collector 11, and the negative nickel tab 3 is welded to the negative coated pole piece 8 through the current collector 11;

[0036](3) Polish the surface of the copper mesh 5 with sandpaper, put it into concentrated sulfuric acid and deionized water for ultrasonic cleaning, and put it into an argon-protected glove box after drying; the...

Embodiment 3

[0042] A method for preparing a reference electrode of a three-electrode pouch battery with copper mesh attached to lithium, specifically comprising the following steps:

[0043] 1) Pretreatment of pole pieces:

[0044] The lithium iron phosphate (LFP) positive electrode prepared in the production line and the corresponding graphite negative electrode sheet are punched with a knife to make 4*4 and 4*5 cm positive and negative electrode coated electrodes, respectively, and ensure that the bottom of the coated electrode sheet is There is a blank area with a width of 1cm that is not coated with positive and negative electrode slurry, which is the placement area for the lithium-attached copper grid in the later stage;

[0045] 2) Welding of positive and negative tabs:

[0046] Through ultrasonic welding, the positive aluminum tab is welded to the positive coated pole piece through the current collector, and the negative nickel tab is welded to the negative coated pole piece throu...

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PUM

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Abstract

The invention discloses a three-electrode soft package battery and a preparation method thereof. The three-electrode soft package battery comprises a laminated battery packaged between an upper aluminum-plastic film and a lower aluminum-plastic film, wherein the laminated battery comprises a positive coated pole piece, two diaphragm layers and a negative coated pole piece; the positive coated pole piece is welded with a positive aluminum tab through a current collector; the negative coated pole piece is welded with a negative nickel tab through the current collector; a copper net is arranged between the two diaphragm layers; a lithium sheet metal covers the surface of one end of the copper net; the other end of the copper net extends out of the diaphragms and is connected with an auxiliary aluminum tab. According to a reference electrode preparation method adopted in the invention, lithium can be directly introduced into the battery, a general lithium plating process is omitted, the operation is easy, and the battery can be applicable to the reference electrode preparation process of various total batteries.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a three-electrode pouch battery and a preparation method thereof. Background technique [0002] When the traditional electrochemical workstation analyzes the internal mechanism of the battery, two electrodes are usually used for testing. The impedance spectrum test obtained in this way can only measure the entire impedance of the battery, and the positive and negative electrodes of the battery cannot be separated to study their respective effects on the internal resistance of the battery. contribution. Therefore, it is necessary to use three electrodes to distinguish the influence of the positive and negative materials in the battery on the impedance of the battery system. The three-electrode system has three electrodes: a working electrode (research electrode), a reference electrode, and an auxiliary electrode. Due to the measurement and monitoring ...

Claims

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Application Information

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IPC IPC(8): H01M10/058H01M4/13H01M2/26
CPCH01M4/13H01M10/058H01M50/531Y02E60/10Y02P70/50
Inventor 钱婧包吴奇
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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