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Reeling method for reel type secondary lithium ion battery

A lithium-ion battery, winding technology, applied in secondary batteries, circuits, electrical components, etc., can solve the problems of high working voltage, poor high-rate discharge performance, and large internal resistance of wound secondary lithium-ion batteries. , to achieve the effect of improving winding efficiency

Inactive Publication Date: 2007-03-14
DONGGUAN NEWPOWER ELECTRIC SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the advantages of high working voltage, high energy density, and low pollution, the secondary lithium-ion battery has aroused widespread interest and has been widely used. poor performance
Regarding the problem of improving the high-rate discharge performance of the secondary battery, although it is mentioned in the patent of CN1445879A filed by Pan Hongge in 2003 that two or more tabs on the positive electrode plate can obviously improve the secondary battery. The high-rate discharge performance of the battery, but its disadvantage is that it does not take into account the impact of the negative electrode sheet on the high-rate discharge performance and the ratio of the negative electrode capacity to the positive electrode capacity in the secondary lithium-ion battery
Moreover, in the winding process of the traditional secondary lithium ion battery, the winding is started from one end of the pole piece. Due to the long length of the pole piece, the gap between the cathode pole piece, the anode pole piece and the separator is formed during the winding process. The alignment is more difficult

Method used

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  • Reeling method for reel type secondary lithium ion battery
  • Reeling method for reel type secondary lithium ion battery
  • Reeling method for reel type secondary lithium ion battery

Examples

Experimental program
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Embodiment

[0018] Example: Lithium cobaltate (LiCoO2), Super-P (acetylene carbon black) and polyvinylidene fluoride (PVDF) are dissolved in N, N-dimethylpyrrolidone (NMP) in a ratio of 85:5:10 Stir evenly, and use NMP to adjust the viscosity to 3000-4000mpa·s, and coat the slurry on a 25um aluminum sheet to make a positive electrode sheet 1; CMS (a kind of anode graphite, mesophase carbon microspheres or spherical graphite ), SBR rubber, CMC (water-based binder, carboxymethyl cellulose) and Super-P were dissolved in deionized water at a ratio of 85:8:4:3, stirred evenly, and adjusted to a viscosity of 1000 with deionized water ~2000mpa·s, the slurry is coated on a 20um copper foil, and the negative electrode sheet 2 is prepared.

[0019] In the blank area in the middle of the negative pole piece 2, a 75*4*0.1 (length*width*height) nickel strip is welded by resistance welding to form the negative pole tab 21, and the ends of the two positive pole pieces 1 are ultrasonically welded An 80*...

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Abstract

This invention relates to secondary lithium ion battery field and to one rolling method of one chip rolling, which comprises the following steps: a, overlapping positive and negative electros and isolation film, wherein, positive electrode is in middle and isolation film on top and bottom with isolation film inside; b, folding the overlapped electrodes and isolation films by positive electrode.

Description

Technical field: [0001] The invention relates to the field of secondary lithium-ion batteries, in particular to a winding method for a secondary lithium-ion battery whose battery core is a winding type. Background technique: [0002] With the development of modern society, small mobile devices such as video cameras, mobile DVDs and notebook computers are becoming more and more popular. These mobile devices have more and more functions, and the energy requirements for mobile power sources are also getting higher and higher. Due to the advantages of high working voltage, high energy density, and low pollution, the secondary lithium-ion battery has aroused widespread interest and has been widely used. Poor performance. Regarding the problem of improving the high-rate discharge performance of the secondary battery, although it is mentioned in the patent of CN1445879A filed by Pan Hongge in 2003 that two or more tabs on the positive electrode plate can obviously improve the seco...

Claims

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Application Information

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IPC IPC(8): H01M10/40H01M10/38H01M10/0587
CPCY02E60/122Y02E60/10Y02P70/50
Inventor 李厚萍赵丰刚王乾方祺许瑞陈卫曾毓群
Owner DONGGUAN NEWPOWER ELECTRIC SCI & TECH
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