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Method for drying cell of high-capacity lithium-ion battery

A power battery and drying method technology, applied in the direction of drying solid materials, electrolyte battery manufacturing, non-aqueous electrolyte battery, etc., can solve the problems of large cycle gas and heat consumption, large vacuum pump loss, vacuum pump oil emulsification, etc., to reduce moisture, Effect of improving drying speed and efficiency

Active Publication Date: 2014-11-12
中创新航科技(江苏)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above method uses too many times of extraction and ventilation, which consumes a lot of circulating gas and heat when drying large-capacity lithium-ion batteries, increases the load on dehumidifiers and vacuum pumps and reduces their service life, especially for vacuum pumps. , the vacuum pump oil is seriously emulsified

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The drying method of the high-capacity lithium-ion power battery cell in this implementation, the specific steps are as follows:

[0028] (1) Put the battery cells to be dried (prepared by stacking the positive electrode, negative electrode, and diaphragm, with a monomer capacity of 40AH) in a vacuum drying furnace (the relative vacuum degree can be adjusted from 0 to -100), Set the temperature of the drying furnace to 30°C, start to heat up, and evacuate to a relative vacuum degree ≤ -99.0, which takes 5 minutes;

[0029] (2) Immediately evacuate with dry gas to a relative vacuum of -10.0, which takes 5 minutes;

[0030] (3) Immediately run the fan in the drying furnace to blow air. The temperature in the furnace gradually increases slowly with the blast. When the temperature rises to 30°C, the drying furnace reduces the heating power and is in a heat preservation state. The heat preservation time is 180 minutes ;

[0031] (4) Immediately evacuate to a relative vacuu...

Embodiment 2

[0035] The drying method of the high-capacity lithium-ion power battery cell in this implementation, the specific steps are as follows:

[0036] (1) Put the battery cells to be dried (prepared by stacking positive electrode sheets, negative electrode sheets, and separators, with a monomer capacity of 100AH) in a vacuum drying furnace (the relative vacuum degree can be adjusted from 0 to -100), Set the temperature of the drying furnace to 50°C, start to heat up, and evacuate to a relative vacuum degree ≤ -99.0;

[0037] (2) Immediately evacuate with dry gas to a relative vacuum of -30.0;

[0038] (3) Immediately run the fan in the drying furnace to blow air. The temperature in the furnace gradually increases slowly with the blast. When the temperature rises to the set temperature of 50°C, the drying furnace reduces the heating power and is in a heat preservation state. The heat preservation time is 160 minutes ;

[0039] (4) Immediately evacuate to a relative vacuum degree ≤ ...

Embodiment 3

[0043] The drying method of the high-capacity lithium-ion power battery cell in this implementation, the specific steps are as follows:

[0044] (1) Put the battery cells to be dried (prepared by stacking the positive electrode, negative electrode, and diaphragm, with a monomer capacity of 200AH) in a vacuum drying furnace (the relative vacuum degree can be adjusted from 0 to -100), Set the temperature of the drying furnace to 70°C, start to heat up, and evacuate to a relative vacuum degree ≤ -99.0;

[0045] (2) Immediately evacuate with dry gas to a relative vacuum of -50.0;

[0046] (3) Immediately run the fan in the drying furnace to blow air. The temperature in the furnace gradually increases slowly with the blast. When the temperature rises to 70°C, the drying furnace reduces the heating power and is in a heat preservation state. The heat preservation time is 140 minutes ;

[0047] (4) Immediately evacuate to a relative vacuum degree ≤ -99.0, and continuously evacuate f...

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Abstract

The invention discloses a method for drying a cell of a high-capacity lithium-ion battery, and belongs to the technical field of manufacturing of lithium batteries. The method comprises the following steps: (1) a to-be-dried battery cell is placed in a drying oven, the drying oven is heated to increase the oven temperature, vacuumizing is performed until the relative vacuum degree is smaller than or equal to minus 99.0; (2) vacuum is unloaded by gas until the relative vacuum degree reaches minus 5.0 to minus 85.0; (3) a blast apparatus in the drying oven is operated, and heat is preserved; (4) vacuumizing is performed until the relative vacuum degree is smaller than or equal to minus 99.0 and is performed continuously; and (5) the steps (2), (3) and (4) are circulated sequentially. According to the method, the battery cell is dried with a method of alternately circulating a convection state and a vacuum state of dry and wet hot air in the oven, and moisture in the battery cell can be reduced effectively with fewer circulation times, so that the drying speed and efficiency of the battery cell are increased, and circulation air amount and consumed heat are reduced.

Description

technical field [0001] The invention specifically relates to a method for drying large-capacity lithium-ion power battery cells, and belongs to the technical field of lithium battery production and manufacturing. Background technique [0002] Due to the demand for energy and environmental protection, lithium-ion energy storage batteries have been developed rapidly. With the wide application of large-capacity lithium-ion batteries, the requirements for their life and safety performance are becoming more and more stringent. The moisture content of battery cells in the production process is Important process parameters that affect the life and safety performance of high-capacity lithium-ion batteries. How to reduce and control the moisture content of battery pole pieces, reduce the drying time of battery pole pieces, improve production efficiency, and save costs is an important technological issue in the production process of large-capacity lithium-ion batteries. [0003] At p...

Claims

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Application Information

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IPC IPC(8): F26B5/04H01M10/058
CPCY02E60/10Y02P70/50
Inventor 刘庆海冯旭东郑喜军张伟唐喜庆裴新来王虹
Owner 中创新航科技(江苏)有限公司
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