A kind of drying method of lithium ion battery cell

A lithium-ion battery and drying method technology, which is applied in the direction of drying solid materials, method combination to dry solid materials, drying, etc., can solve the problems that batteries are difficult to adapt to industrial production, and achieve cost reduction and efficiency increase product quality and cost reduction , the effect of reducing the amount of deformation

Active Publication Date: 2018-09-18
CHINA AVIATION LITHIUM BATTERY LUOYANG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for drying lithium-ion battery cells, thereby solving the problem in the prior art that the drying method for cells is difficult to adapt to industrial production

Method used

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  • A kind of drying method of lithium ion battery cell
  • A kind of drying method of lithium ion battery cell
  • A kind of drying method of lithium ion battery cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The drying method of the lithium-ion battery cell of the present embodiment, the technological process is as follows Figure 4 shown, including the following steps:

[0032] 1) Put the lithium-ion battery cell (the cell is prepared by lamination of positive electrode, negative electrode, and diaphragm, placed in an unsealed shell, with a monomer capacity of 20Ah, a total of 200 pieces) in a drying oven , evacuated to a vacuum degree below 200Pa, the time used is 8min (h in formula 1);

[0033] 2) Simultaneously perform heating, air inflation, and blasting operations, control the temperature in the drying furnace to rise to 90°C (time-consuming 20min), fill nitrogen to a vacuum of 85kPa (time-consuming ≤ 1min), and reach the set temperature and vacuum degree Insulation and pressure holding; the time used for the whole process is 2.5h (h in formula 1 1 ), during which the blowing continues;

[0034] 3) Stop the blowing and nitrogen filling operations, maintain the temp...

Embodiment 2

[0039] The drying method of the lithium-ion battery cell of the present embodiment may further comprise the steps:

[0040] 1) Put the lithium-ion battery cell (the cell is prepared by lamination of positive electrode, negative electrode, and diaphragm, placed in an unsealed shell, with a monomer capacity of 72Ah, a total of 200 pieces) in a drying oven , evacuated to a vacuum degree below 200Pa, the time used is 10min (h in formula 1);

[0041] 2) Simultaneously perform heating, air inflation, and blasting actions, control the temperature in the drying furnace to rise to 95°C (time-consuming 25min), fill nitrogen to a vacuum degree of 90kPa (time-consuming ≤ 1min), and reach the set temperature and vacuum degree Insulation and pressure holding; the time used for the whole process is 3.5h (h in formula 1 1 ), during which the blowing continues;

[0042] 3) Stop the blowing and nitrogen filling operations, maintain the temperature in the drying furnace at 95°C, evacuate to a ...

Embodiment 3

[0047] The drying method of the lithium-ion battery cell of the present embodiment may further comprise the steps:

[0048] 1) Put the lithium-ion battery cell (the cell is made of positive electrode, negative electrode, and diaphragm by lamination, placed in an unsealed shell, with a monomer capacity of 100Ah) in a drying oven, and vacuum to The vacuum degree is below 200Pa, and the time used is 12min (h in formula 1);

[0049] 2) Simultaneously perform heating, air inflation, and blasting actions, control the temperature in the drying furnace to rise to 110°C (time-consuming 30min), fill nitrogen to a vacuum of 95kPa (time-consuming ≤ 1min), and reach the set temperature and vacuum degree Insulation and pressure holding; the time used for the whole process is 5h (h in formula 1 1 ), during which the blowing continues;

[0050] 3) Stop the blowing and nitrogen filling operations, maintain the temperature in the drying furnace at 110°C, evacuate to a vacuum degree of 90Pa (t...

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Abstract

The invention discloses a lithium ion battery core drying method. The lithium ion battery core drying method comprises the following steps of: (1) putting a lithium ion battery core in a closed system, and carrying out vacuum pumping, wherein the time taken is recorded as h; (2) heating, inflating and blasting the system simultaneously; carrying out heat preservation and pressure maintaining after reaching the setting temperature and vacuum degree; and continuously blasting in the whole process, wherein the time taken is recorded as h1, and a medium used for inflation and blasting is a non-oxide gas; and (3) maintaining the temperature of the system to be 90-110 DEG C, carrying out vacuum pumping till the vacuum degree is below 100Pa, and carrying out pressure maintaining, wherein the time taken in the whole process is recorded as h2, and h, h1 and h2 meet conditions shown in the (I). The lithium ion battery core drying method is simple in technology, improves drying efficiency, reduces the time taken for drying and the deformation of a battery core diaphragm in a drying process, facilitates realization of cost reduction, benefit increasing and product quality improvement for battery production enterprises and is suitable for large-scale popularization and application.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a drying method for lithium ion battery cells. Background technique [0002] In the production process of lithium-ion batteries, it is necessary to dry the batteries before or after entering the shell to ensure that the moisture contained in the batteries is controlled within a certain range before the next liquid injection process can be performed. The high moisture content of the lithium-ion battery cell will cause the lithium-ion battery to react with the electrolyte during charging and discharging, thereby affecting the service life and performance of the lithium-ion battery. How to effectively reduce the moisture content of batteries, improve production efficiency, and save costs is an important technological issue in the industrial production process of modern lithium-ion batteries. [0003] CN102735023A discloses a drying method for lithium-ion b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F26B7/00
CPCF26B7/00
Inventor 漆振涛张伟张洁赵博曲斌郑喜军黄伟明
Owner CHINA AVIATION LITHIUM BATTERY LUOYANG
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