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Lithium ion battery assembly method and lithium ion battery

A lithium-ion battery and assembly method technology, which is applied in the field of lithium-ion batteries, can solve problems affecting battery electrical performance, battery batch electrical consistency, electrolyte loss, etc., to shorten the standing time, shorten the online time, and ensure battery life. The effect of sexual congruence

Inactive Publication Date: 2020-01-14
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: mix the high-voltage positive electrode active material high-voltage 4.45V lithium cobaltate, CNTs (carbon nanotubes) and PVDF (polyvinylidene fluoride) according to the mass ratio of 98.5:0.5:1.0, and then disperse them in N- Methyl-2-pyrrolidone to obtain the positive electrode slurry; the positive electrode slurry is evenly coated on both sides of the aluminum foil, and the positive electrode sheet is obtained after rolling and cutting.

[0027] (2) Negative electrode preparation: Mix artificial graphite negative electrode material, acetylene black, CMC (carboxymethyl cellulose), SBR (carboxylated styrene-butadiene rubber) according to the mass ratio of 96.8:1.0:1.2:1.0, and then disperse them in deionized water , to obtain the negative electrode slurry; the negative electrode slurry is evenly coated on both sides of the copper foil, and the negative electrode sheet is obtained after rolling and cutting.

[0028] (3) Electrolyte pr...

Embodiment 2

[0037] The difference from Example 1 is the assembly of the lithium ion battery: the temperature of the electrolyte is 20°C.

[0038] The rest are the same as in Embodiment 1, and will not be repeated here.

Embodiment 3

[0040] The difference from Example 1 is the assembly of the lithium ion battery: the temperature of the electrolyte is 75°C.

[0041] The rest are the same as in Embodiment 1, and will not be repeated here.

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PUM

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Abstract

The invention belongs to the technical field of lithium ion batteries, and particularly relates to a lithium ion battery assembly method which comprises the following steps: baking a positive plate, anegative plate and a diaphragm to obtain a baked positive plate, a baked negative plate and a baked diaphragm; laminating and / or winding the baked positive plate, the baked negative plate and the baked diaphragm; welding a tab to obtain a bare battery cell; soaking the bare battery cell in an electrolyte to obtain a battery cell soaked in the electrolyte; putting the battery cell soaked in the electrolyte into a shell, and performing packaging; and forming and re-packaging the packaged battery cell to obtain the lithium ion battery. According to the method, the bare battery cell is directly soaked in the electrolyte, so that the battery pole piece and the diaphragm are fully soaked by the electrolyte; then the liquid supplementing procedure is added according to the designed weight, so that the electrical consistency among battery batches can be ensured; and the standing time of a battery after liquid injection can be shortened, and the production efficiency is improved. The lithium ion battery prepared by the method disclosed by the invention is high in safety performance and good in cycle performance.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a lithium ion battery assembly method and a lithium ion battery. Background technique [0002] Lithium-ion secondary battery, as a green battery, has the advantages of high working voltage, high specific energy and long cycle life. It has been developed rapidly in recent years. The application in is more and more extensive. The expansion of battery application fields and the increase in battery demand have prompted battery manufacturers to simplify the process flow, reduce process time to improve production efficiency to meet market requirements, and continuously improve the comprehensive electrochemical performance of batteries to meet application requirements. [0003] The lithium-ion battery assembly process generally needs to go through the processes of pole piece preparation, lamination or winding, welding, packaging, baking, liquid injection, stan...

Claims

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Application Information

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Patent Type & Authority Applications(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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