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Rapid drying method for lithium ion battery cell

A lithium-ion battery, rapid drying technology, applied in the direction of drying solid materials, method combination to dry solid materials, drying, etc., can solve the problems of long baking time of batteries, waste of energy and time, and occupying more ovens, etc., to achieve The effect of shortening the production cycle, saving equipment and energy costs, and fast cooling speed

Active Publication Date: 2015-12-02
SHANDONG GOLDENCELL ELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, in the production process of lithium-ion batteries, the battery cells take a long time to bake and occupy a lot of ovens. Different types of cells have different baking times. Generally, the total drying time is 30-90 hours. Baking needs to be continuously heated, vacuumed, Filling inert gas and other links, in the process of vacuuming and filling inert gas, it needs to be h

Method used

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  • Rapid drying method for lithium ion battery cell
  • Rapid drying method for lithium ion battery cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Baking samples of 18650-1600mAh-3.2V steel shell cylindrical lithium-ion battery cells.

[0029] 1. First put the bare cell sample into a vacuum oven, set the temperature of the vacuum oven to 85°C, the oven reaches the set temperature in about 1.5 hours at room temperature, and bake the bare cell at 85±5°C for 20 minutes;

[0030] 2. Then evacuate until the vacuum degree of the vacuum oven is below -0.095Mpa, it takes about 5 minutes to evacuate, and bake at 85±5°C for 30 minutes;

[0031] 3. Finally, fill the vacuum oven with high-temperature dry nitrogen at 85±5°C until the vacuum degree of the vacuum oven is above -0.01MPa. It takes about 5 minutes to inflate, and bake at 85±5°C for 10 minutes;

[0032] 4. Cycle ②~③ steps 15 times;

[0033] 5. Turn off the heating part of the vacuum oven, evacuate until the vacuum degree of the vacuum oven is below -0.08Mpa, and it takes about 5 minutes to pump air, and then fill it with dry nitrogen at room temperature until the v...

Embodiment 2

[0036] Carry out 09140200 type polymer lithium-ion battery cell sample baking.

[0037] 1. First put the bare cell sample into a vacuum oven, set the temperature of the vacuum oven to 85°C, the oven reaches the set temperature in about 1.5 hours at room temperature, and bake the bare cell at 85±5°C for 20 minutes;

[0038] 2. Then evacuate until the vacuum degree of the vacuum oven is below -0.095Mpa, it takes about 5 minutes to evacuate, and bake at 85±5°C for 20 minutes;

[0039] 3. Finally, fill the vacuum oven with high-temperature dry nitrogen at 85±5°C until the vacuum degree of the vacuum oven is above -0.01MPa. It takes about 5 minutes to inflate, and bake at 85±5°C for 5 minutes;

[0040] 4. Cycle ②~③ steps 10 times.

[0041] 5. Turn off the heating part of the vacuum oven, evacuate until the vacuum degree of the vacuum oven is below -0.08Mpa, and it takes about 5 minutes to pump air, and then fill it with dry nitrogen at room temperature until the vacuum degree of t...

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Abstract

The invention discloses a rapid drying method for a lithium ion battery cell and aims at finding a reasonable lithium ion battery cell baking process with high baking efficiency, good baking effect and low baking cost. The rapid drying method comprises the steps of firstly, baking a naked battery cell in a vacuum oven; then, repeating the operations of vacuum baking and baking with high-temperature dry nitrogen gas; and finally, introducing normal-temperature dry nitrogen gas to cool after vacuumizing. The rapid drying method has the following advantages and effects that 1, the boiling point of water is extremely low under the vacuum degree of lower than -0.095Mpa, and the water removal effect is better if the naked battery cell is heated at the vacuum degree and the temperature of 85+/-5 DEG C for 20-30 minutes; 2, the high-temperature dry nitrogen gas is introduced to the vacuum oven, so that the temperature of the naked battery core cannot be reduced, the temperature fluctuation of the battery cell in the whole battery cell drying process is not high, and the baking efficiency is increased; and 3, the cooling speed is high because the normal-temperature dry nitrogen gas is introduced after the water removal operation of the naked battery cell is finished, and the production period of a lithium ion battery is greatly shortened because the whole baking process of the battery core lasts for 8-20 hours.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a method for rapidly drying lithium ion battery cells. Background technique [0002] As a new type of clean and renewable secondary energy, lithium-ion batteries have the advantages of high energy density, small self-discharge, good safety performance and high rate performance. They have become excellent energy sources for electronic equipment and power vehicles, and have been widely used. Enterprises not only pay attention to the improvement of product quality, but also pay attention to the improvement of production efficiency and the reduction of production cost. [0003] At present, in the production process of lithium-ion batteries, the battery cells take a long time to bake and occupy a lot of ovens. Different types of cells have different baking times. Generally, the total drying time is 30-90 hours. Baking needs to be continuously heated, vacuumed...

Claims

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Application Information

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IPC IPC(8): F26B7/00
Inventor 关成善宗继月张敬捧王勇李涛
Owner SHANDONG GOLDENCELL ELECTRONICS TECH
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