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Vacuum drying method for lithium battery cell

A technology of vacuum drying and lithium battery, which is used in drying solid materials, drying gas arrangement, drying solid materials without heating, etc., can solve the problems of low efficiency, increased cost, large energy consumption, etc. The effect of increasing the vaporization rate and increasing the vacuum degree of baking

Inactive Publication Date: 2017-05-10
OPTIMUM BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the baking temperature and vacuum degree do not change, conventional baking methods can only prolong the baking time to control moisture. Usually, the baking completion time is 24-48 hours, and the efficiency is low. Long-term baking will cause large energy consumption and increase cost

Method used

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  • Vacuum drying method for lithium battery cell
  • Vacuum drying method for lithium battery cell
  • Vacuum drying method for lithium battery cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1), put the lithium battery into the vacuum oven, close the oven door;

[0022] (2) Turn on the heating switch and heat up to 85°C; turn on the vacuum pump and evacuate to 0.2Kpa~0.3Kpa;

[0023] (3), keep constant vacuum degree, temperature, bake for 2 hours;

[0024] (4) Introduce dry nitrogen, unload the vacuum to normal pressure of 101.325Kpa, and keep the time of nitrogen inflow for 2min to 3min;

[0025] (5), vacuumize to 0.2Kpa~0.3Kpa, bake for 2 hours;

[0026] (6), feed dry nitrogen, unload the vacuum to normal pressure; cool down to below 60°C, and obtain the lithium battery cells that have been grilled. After the baking is completed, take out the battery cell and measure the moisture content of the pole piece.

Embodiment 2

[0028] (1), put the lithium battery into the vacuum oven, close the oven door;

[0029] (2) Turn on the heating switch and heat up to 85°C; turn on the vacuum pump and evacuate to 0.2Kpa~0.3Kpa;

[0030] (3), keep constant vacuum degree, temperature, bake for 2 hours;

[0031] (4) Introduce dry nitrogen, unload the vacuum to normal pressure of 101.325Kpa, and keep the time of nitrogen inflow for 2min to 3min;

[0032] (5), vacuumize to 0.2Kpa~0.3Kpa, bake for 2 hours;

[0033] (6) Introduce dry nitrogen, unload the vacuum to normal pressure 101.325Kpa, and keep the time of nitrogen inflow for 2min to 3min;

[0034] (7), vacuumize to 0.2Kpa~0.3Kpa, bake for 2 hours;

[0035] (8) Introduce dry nitrogen, unload the vacuum to normal pressure; cool down to below 60°C, and bake the lithium battery cells. After the baking is completed, take out the battery cell and measure the moisture content of the pole piece.

[0036] Embodiment one, embodiment two implementation data:

[00...

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Abstract

The invention provides a vacuum drying method for a lithium battery cell. The vacuum drying method comprises the following steps that S1, the lithium battery cell is put into a vacuum baking oven, and the vacuum baking oven is closed; S2, a heating switch of the vacuum baking oven is turned on, and the temperature rises to 85 DEG C; a vacuum pump is opened, and the vacuum baking oven is vacuumized to 0.5 Kpa below; S3, the constant vacuum degree and temperature of the vacuum baking oven are kept, and baking is conducted for 1 hour to 3 hours; S4, dry nitrogen is introduced into the vacuum baking oven, vacuum-unloading is conducted on the vacuum baking oven to the normal pressure, and the nitrogen is kept being introduced for 2 min-3 min; S5, the vacuum baking oven is vacuumized to 0.5 Kpa below again, and baking is conducted for 1 hour to 3 hours; and S6, the dry nitrogen is introduced to the baking oven, vacuum-unloading is conducted on the vacuum baking oven to the normal pressure, and cooling is conducted.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries, in particular to a method for vacuum drying lithium battery cells. Background technique [0002] The three key factors in the lithium battery manufacturing process are moisture, dust, and aging; among them, moisture control in the lithium battery manufacturing process is particularly important. Moisture can easily lead to increased battery internal resistance, low capacity, poor cycle performance, and poor electrical performance, directly affecting battery performance. play. The baking process before battery cell injection is a key process to control battery moisture. Research on how to improve baking efficiency and reduce battery moisture has become a problem that lithium battery manufacturers pay close attention to. [0003] At present, lithium battery manufacturers generally use vacuum ovens to bake batteries, and the baking efficiency of lithium batteries is greatly affected by tem...

Claims

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Application Information

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IPC IPC(8): F26B5/04F26B7/00F26B21/00
Inventor 邓昌源钱龙饶睦敏李瑶
Owner OPTIMUM BATTERY CO LTD
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