Positive plate, negative plate, battery cell, lithium battery and preparation method of lithium battery

A technology of positive pole piece and negative pole piece, which is applied in the field of energy storage lithium battery, can solve the problems of uneven heating, small proportion of positive and negative electrode ears, etc., and achieves high compaction surface density, high lamination yield, The effect of large battery capacity

Inactive Publication Date: 2019-09-10
湖北锂诺新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the above-mentioned technical problems, the present invention provides a positive pole piece, a negative pole piece, a battery cell and a lithium battery and a preparation method thereof. By designing positive and negative tabs at both ends of the pole piece, it is beneficial to improve the charging and discharging process of the battery The problem of uneven heat generation in the middle, and at the same time, the area ratio of the positive and negative tabs is small, which is conducive to improving the capacity of the battery

Method used

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  • Positive plate, negative plate, battery cell, lithium battery and preparation method of lithium battery
  • Positive plate, negative plate, battery cell, lithium battery and preparation method of lithium battery
  • Positive plate, negative plate, battery cell, lithium battery and preparation method of lithium battery

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preparation example Construction

[0080] The invention discloses a preparation method of a lithium battery, which specifically comprises the preparation of a positive pole piece 1 and a negative pole piece 2, folding the positive pole piece 1, the negative pole piece 2 and a separator 3, hot pressing, and making the positive pole piece Ear 1.1 and negative electrode ear 2.1 are subjected to resistance pre-welding to obtain lithium battery cell 4, and then the lithium battery cell 4 is assembled with positive electrode cover plate 5, negative electrode cover plate 6, lithium battery shell 7, and mylar film, and filled Electrolyte, that is, the lithium battery is made.

[0081] Specifically, such as figure 1 As shown, the electrode sheet slurry is coated on the surface of the current collector and a blank area is reserved for use as a positive electrode tab or a negative electrode tab. In this application, the current collector is almost completely coated, and only the tabs are reserved in the middle. The cloth...

Embodiment 1

[0085] The invention discloses a preparation method of a lithium battery, and the specific steps are as follows:

[0086] (1) Preparation of positive electrode slurry: the positive electrode active material, polyvinylidene fluoride binder, SP conductive agent, and CNT conductive slurry are stirred according to the mass percentage of 97:1.5:0.7:0.8, dispersed at high speed, sieved, and removed. iron, defoaming, and positive electrode slurry is obtained, and the positive electrode active material is carbon-coated lithium iron phosphate;

[0087] (2) Preparation of negative electrode slurry: by stirring the negative electrode active material, sodium carboxymethylcellulose (CMC), styrene-butadiene rubber (SBR) binder, and SP conductive agent according to the mass percentage of 98:0.4:1:0.6 , high-speed dispersion, sieving, iron removal, and foam removal to obtain negative electrode slurry, and the negative electrode active material is graphite;

[0088] (3) Preparation of electro...

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Abstract

The invention discloses a positive plate, a negative plate, a battery cell, a lithium battery and a preparation method of the lithium battery, and belongs to the technical field of batteries. Positiveand negative tabs on the positive and negative plates belong to embedded tabs; on the premise that the shape and size of the battery are kept the same, the mass energy density of the embedded tabs ishigher than that of the extended tabs; meanwhile, due to the fact that an area ratio of the positive and negative tabs is low, the internal space utilization rate of the battery is high, and the advantages of high compaction surface density of the positive and negative plates and larger battery capacity are achieved; and the positive and negative tabs are positioned at the two ends of the positive and negative plates respectively, so that the problem of non-uniform heating in the charging and discharging processes of the lithium battery can be effectively improved, and the safety and reliability of the lithium battery are improved.

Description

technical field [0001] The invention relates to an energy storage lithium battery, which belongs to the technical field of batteries, in particular to a positive pole piece, a negative pole piece, a battery cell, a lithium battery and a preparation method thereof. Background technique [0002] Energy storage devices are an important prerequisite for realizing the use and promotion of green energy. The development of new high-efficiency energy storage devices has important strategic significance for improving the structure of energy use, promoting the development of green energy, improving resource utilization efficiency, and solving environmental problems. [0003] As an important and efficient energy storage device, lithium battery has the advantages of high energy density, large output power, high voltage, low self-discharge, wide operating temperature, no memory effect and environmental friendliness; it is widely used in mobile phones, notebook computers, Electric vehicle...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M2/26H01M10/052H01M10/0585
CPCH01M4/13H01M10/052H01M10/0585H01M50/531Y02E60/10Y02P70/50
Inventor 陈刚马卫杨梢张天赐陈中华孙伟兵
Owner 湖北锂诺新能源科技有限公司
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