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Lithium-ion battery assembly method and lithium-ion battery

A lithium-ion battery and assembly method technology, applied in the field of lithium-ion batteries, can solve problems such as loss of electrolyte, affecting battery electrical performance, battery batch electrical consistency, etc., to achieve shortened online time, shortened standing time, and cycle performance Good results

Active Publication Date: 2021-08-10
汇洋世纪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

However, at the same time as the gas is discharged, a part of the electrolyte will be discharged from the inside of the battery along with the gas, resulting in the loss of the electrolyte, affecting the electrical performance of the battery and the electrical consistency between battery batches

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Positive electrode preparation: High voltage of high voltage positive electrode active material is 4.45 V lithium cobaltate, CNTs (carbon nanotubes) and PVDF (polyvinylidene fluoride) are mixed in mass than 98.5: 0.5: 1.0 mixed, then dispersed in N- Methyl-2-pyrrolidone is obtained by a positive electrode slurry; the positive electrode slurry is evenly applied to both sides of the aluminum foil. After rolling, the positive electrode sheet is obtained.

[0027] (2) Negative electrode preparation: a human stocus negative electrode material, acetylene black, CMC (carboxymethylcellulose), SBR (carboxybutyrobenzene) is mixed in mass than 96.8: 1.0: 1.2: 1.0 mix well, then dispersed in deionized water To obtain a negative electrode slurry; a negative slurry is applied to both sides of the copper foil, and after rolling, the negative electrode is obtained.

[0028] (3) Electrolytic solution: in a glove box filled with nitrogen (O 2 2 In <3 ppm), a vinyl carbonate, carbonate, m...

Embodiment 2

[0038] Unlike Example 1, a lithium ion battery is assembled: the temperature of the electrolyte is 20 ° C.

[0039] The rest is the same as in Example 1, and details will not be described here.

Embodiment 3

[0041] Unlike Example 1, an assembly of a lithium ion battery: The temperature of the electrolyte was 75 ° C.

[0042] The rest is the same as in Example 1, and details will not be described here.

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PUM

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Abstract

The invention belongs to the technical field of lithium ion batteries, and in particular relates to a method for assembling a lithium ion battery, comprising the following operations: baking the positive electrode sheet, the negative electrode sheet and the diaphragm; baking the baked positive electrode sheet, the baked negative electrode sheet and baking The final diaphragm is placed in the electrolyte for infiltration; the infiltrated positive electrode sheet, the infiltrated negative electrode sheet and the infiltrated diaphragm are stacked and / or wound; the tabs are welded to obtain a bare cell; the bare cell is put into the shell , encapsulation; forming and re-encapsulating the bare cell after the encapsulation in step five, to obtain a lithium-ion battery. The method of the present invention bakes the battery pole piece and the diaphragm, and the heat can quickly penetrate the pole piece and the diaphragm, shortening the online time of the battery; directly infiltrating the baked positive and negative pole pieces and the diaphragm into the electrolyte, which can ensure the stability of the battery. Electrical consistency between batches; the method of the invention can shorten the standing time of the battery after liquid injection and improve production efficiency. The lithium ion battery prepared by the method of the invention has high safety performance and good cycle performance.

Description

Technical field [0001] The invention belongs to the technical field of lithium ion batteries, and more particularly to a lithium ion battery assembly method and a lithium ion battery. Background technique [0002] The lithium-ion secondary battery is a green environmental protection battery, has the advantages of high operating voltage, high than energy and long-range life. In recent years, it has developed rapidly, mobile devices such as mobile phones, UPS power supplies, laptops, electric bicycles and electric vehicles. The application is getting wider. The expansion of the battery application and the increase in battery demand have caused battery manufacturers to simplify process flows and reduce process time to meet production efficiency to meet market requirements, and continuously improve battery integrated electrochemical performance to meet the application requirements. [0003] Lithium-ion battery packing process generally requires a pole preparation, lamination or windi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/058H01M10/0525
CPCH01M10/0525H01M10/058Y02E60/10Y02P70/50
Inventor 王易玮许瑞胡坤肖凯
Owner 汇洋世纪新能源科技有限公司
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