Power soft packaging lithium ion battery with high power

A lithium-ion battery, flexible packaging technology, applied in secondary batteries, circuits, electrical components, etc., to achieve the effect of optimal design

Inactive Publication Date: 2010-06-23
TIANJIN LISHEN BATTERY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the shortcomings existing in the traditional power battery, completely change the existing power battery mode, and improve the mass specific energy and energy density of the battery by adopting the external packaging structure of the aluminum-plastic composite film. The current-collecting structure of

Method used

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  • Power soft packaging lithium ion battery with high power
  • Power soft packaging lithium ion battery with high power
  • Power soft packaging lithium ion battery with high power

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Embodiment Construction

[0013] The present invention will be further described below in conjunction with the accompanying drawings.

[0014] Design a 5Ah high-power lithium-ion battery, the specific implementation is as follows.

[0015] Pole piece production:

[0016] Positive plate: LiFePO 4 , Carbon black and N-methylpyrrolidone (NMP) solution of polyvinylidene fluoride are uniformly mixed in proportion, LiFePO 4 The active material accounts for 90% of the total mass, and is evenly coated on the aluminum foil (20μ) current collector, and the coating density is 24mg / cm 2 , dried at 120°C, after rolling and densification treatment, the thickness of the pole piece is controlled to 130±2μm, and then cut, the size of the material area is 118×68mm.

[0017] Negative electrode sheet: Mix MCMB powder, carbon black and polyvinylidene fluoride N-methylpyrrolidone (NMP) solution in proportion, MCMB accounts for 90% of the total mass of the negative electrode, and evenly coat it on the copper foil (15μ) cu...

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Abstract

The invention discloses a power soft packaging lithium ion battery with high power. The power soft packaging lithium ion battery is realized by the following technical scheme that a diaphragm has a structure for coiling according to the square battery pole group structure. The power soft packaging lithium ion battery is characterized in that a pole piece is inserted into an inflection point of each square surface of the diaphragm, and the pole piece has a two-way extraction lug structure; and the center of the pole group is provided with a micropore plastic plate skeleton. The lithium ion battery thoroughly changes the existing power battery mode, improves the mass ratio energy and the energy density of the battery by the external packaging structure of an aluminum plastics composite membrane, improves the afflux structure of an internal pole group by an innovative coiling lamination structure, and improves the defect of low strength of the aluminum plastics membrane by adding internally a micropore plastic skeleton structure so as to improve the safety performance of the battery.

Description

technical field [0001] The invention relates to the field of batteries, and more specifically relates to a high-power power soft-pack lithium-ion battery. The electrochemical performance of the battery is improved by optimizing and improving the overall current-collecting structure inside the battery. Background technique [0002] Compared with other types of batteries such as lead-acid and nickel-cadmium, lithium-ion batteries have the advantages of large specific capacity, high operating voltage, fast charging speed, wide operating temperature range, long cycle life, small size, and light weight. At present, it has been widely used in mobile phones, notebook computers, electric tools and other fields, and its application range is becoming wider and wider. [0003] With the expansion of the use of lithium-ion batteries, we are used to calling the chemical power sources used in power supply systems power batteries, such as power tools, electric vehicles and other fields, the...

Claims

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Application Information

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IPC IPC(8): H01M10/38
CPCY02E60/12Y02E60/10Y02P70/50
Inventor 邱扬叶茂刘凤龙李敬脱佳彬杜磊吕小梅
Owner TIANJIN LISHEN BATTERY
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