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Method for making electric core of lithium ion battery

A lithium-ion battery and cell technology, which is applied in the field of lithium-ion battery cell preparation, can solve the problems of increased battery internal resistance, shortened service life, and reduced battery capacity, so as to improve production efficiency, stable and reliable performance, and increase service life Effect

Inactive Publication Date: 2008-09-17
JIANGSU DIO ENERGY SCI TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this way of lamination, the pole piece and the diaphragm are not tightly bonded, and there are gaps, which is not conducive to high-rate discharge, and it will also cause wrinkles on the diaphragm and pole piece, increase the internal resistance of the battery, increase the self-consumption energy of the battery, and increase the battery capacity. Reduced and shortened service life; in addition, the negative electrode sheet and the diaphragm are stacked, and it takes a lot of time and energy to align the electrode sheet and the diaphragm when winding or stacking by hand, and the work efficiency is not high

Method used

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Examples

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Embodiment

[0012] Example: Preparation of adhesive polyvinylidene fluoride: Dilute polyvinylidene fluoride powder with NMP (N-methylpyridone) or acetone to prepare polyvinylidene fluoride with a content of about 8%. Use commercially available PP, PE three-layer composite or single-layer PP (porosity 45%-50%) diaphragms, cut the width 1mm --- 1.5mm wider than the width of the pole piece to make the diaphragm, on the bonding surface with the pole piece , coating surface density 5mg / cm 2 The polyvinylidene fluoride glue prepared on the left and right is baked at a temperature above the volatilization point of the solvent for two or three times (for example, NMP is used as a solvent at 110 ° C, and acetone is used as a solvent at 45 ° C), and the solvent is removed by drying. Lay the diaphragm and pole piece neatly, line the top and bottom with a PET protective film, put them on a thermal lamination machine at 125°C, and heat press them into a whole with a roller pressure of 200N.

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Abstract

The present invention is an improvement of the preparing method of a lithium ion battery electrical core, characterized in that a diaphragm and / or electrode plate binding face has adhesive which is capable of resisting electrolyte, redox reaction and solid content is 2-30%, voltage attaching after mutually stacking, and the diaphragm voidage is above 30%. A gap does not exist between the diaphragm and the electrode pate, the battery has large rate discharge ability, especially for a battery product of a power battery, an electrical tool battery, a model airplane battery which has requirement to large rate discharge; the battery has a small internal resistance, small self-consumption power. The diaphragm is patched with the electrode plate at the same time, not only reducing the alignment degree adjustment of the diaphragm and the electrode plate under the winding or overlapping course, greatly enhancing the battery preparing production efficiency; the diaphragm and the electrode plate not easy wrinkle, benefit to improve the battery life service, the capability is more stable and credible.

Description

technical field [0001] The invention is an improvement on the preparation method of lithium-ion battery cells, and in particular relates to a preparation method of the cell with good bonding performance between a diaphragm and a pole piece and small gaps. Background technique [0002] In the manufacture of existing lithium-ion batteries, whether it is a winding type or a laminated type, the positive and negative electrode sheets are directly stacked with a separator, and then wound or laminated. In this superposition method, the pole piece and the diaphragm are not tightly bonded, and there are gaps, which is not conducive to high-rate discharge, and it will also cause wrinkles on the diaphragm and pole piece, increase the internal resistance of the battery, increase the self-consumption energy of the battery, and increase the battery capacity. In addition, the negative electrode sheet and the diaphragm are superimposed, and it takes a lot of time and energy to align the ele...

Claims

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Application Information

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IPC IPC(8): H01M10/40H01M10/38H01M10/058
CPCY02E60/122Y02E60/10Y02P70/50
Inventor 王建良吉孟君蒋国卫
Owner JIANGSU DIO ENERGY SCI TECH
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