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Preparation method of winding-structure lithium ion battery

A technology of lithium-ion batteries and positive plates, which is applied in the direction of secondary batteries, circuits, electrical components, etc., can solve the problems of rapid drop of battery discharge platform, improve product competitiveness, improve rate performance and cycle life, and reduce production capacity. The effect of air velocity

Active Publication Date: 2012-08-15
NINGDE AMPEREX TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to: aim at the deficiencies of the prior art, and provide a kind of preparation method of the lithium-ion battery of winding structure, to improve the large rate performance of the battery, cycle performance and the temperature rise when charging and discharging with large current, and solve The problem that the battery discharge platform drops too fast, thereby reducing the risk of overheating of lithium-ion batteries

Method used

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  • Preparation method of winding-structure lithium ion battery
  • Preparation method of winding-structure lithium ion battery
  • Preparation method of winding-structure lithium ion battery

Examples

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Embodiment 1

[0040] The following is an example of bending once along the center line of the length of the pole piece (that is, only one V shape is provided on the positive pole piece 10 and the negative pole piece 20) to illustrate the specific process:

[0041] Preparation of positive electrode sheet 10:

[0042] LiCoO 2 (Lithium cobaltate), Super-P (conductive carbon black), PVDF (polyvinylidene fluoride) and NMP (N,N-dimethylpyrrolidone) in a mass ratio of 95:2:3 were mixed and stirred evenly to obtain positive electrode slurry material. Viscosity was adjusted by NMP during stirring. Then the slurry is evenly coated on both sides of the 14 micron thick positive electrode current collector 1 (aluminum foil) according to a certain width, and the coating adopts interval coating instead of continuous coating. Reserve a blank area 3 for the positive electrode sheet on both sides (such as figure 1 As shown), a horizontal blank area 9 is reserved in the width direction of one side of the ...

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Abstract

The invention belongs to the technical field of lithium ion batteries and particularly relates to a preparation method of a winding lithium ion battery. The preparation method comprises the following steps of: coating anode paste on an anode current collector, drying and then cold pressing the anode paste, and then bending an anode plate to be V-shaped; processing an cathode plate with the same steps, placing the bent anode plate and the bent cathode plate in a crossing way, placing a diaphragm between the anode plate and the cathode plate, welding and connecting the anode plate by virtue of an anode pole ear, and welding and connecting the cathode plate by virtue of a cathode pole ear, thus obtaining a pole plate group; winding the pole plate group to form a battery cell, placing the battery cell in a packaging bag, and performing injection and formation to obtain the lithium ion battery. Compared with the prior art, the preparation method decreases the resistance of the pole plates through bending the pole plates, thus reducing ohmic polarization in a charge-discharge process, improving the consistency of the battery, and obviously reducing the gas production speed of joule heat and side reaction in the charge-discharge process so as to improve the power multiplying performance and prolong the cycle life of the lithium battery and a lithium ion battery pack.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a preparation method of a winding-type lithium-ion battery with a large rate. Background technique [0002] Lithium-ion batteries have been widely used in consumer electronics, such as laptops, smartphones, tablets, and power tools (such as electric vehicles), because of their advantages such as high energy density, excellent cycle performance, environmental friendliness, and no memory effect. a wide range of applications. General consumer electronic products are charged by DC power supply, and the charging time generally ranges from 3 hours to 10 hours. In a low-temperature environment, in order to prevent lithium deposition in the battery, the charge-discharge current density is generally reduced to one-third or one-fifth of that at normal temperature. With the acceleration of the pace of life, end consumers hope that the charging and discharging spe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0587
CPCY02E60/10Y02P70/50
Inventor 王会勤周铁刚
Owner NINGDE AMPEREX TECH
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