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Method for drying lithium ion battery cell before liquid injection

A lithium-ion battery, pre-drying technology, applied in the direction of secondary batteries, dry solid materials, dry gas arrangement, etc., can solve the problems of inability to guarantee the consistency of multiple batteries, waste of large energy, and low efficiency

Active Publication Date: 2019-11-08
HUIZHOU HENGTAI TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In this way, in the process of drying lithium-ion battery cells before liquid injection, the efficiency is very low, and the temperature of the inert gas changes greatly, reheating needs to waste a lot of energy, and it is impossible to guarantee simultaneous drying of multiple cells Consistency

Method used

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  • Method for drying lithium ion battery cell before liquid injection
  • Method for drying lithium ion battery cell before liquid injection

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] A1. Convert liquid nitrogen into gaseous nitrogen, and heat up the gaseous nitrogen to obtain gaseous nitrogen at 70°C;

[0057] A2. Put the lithium-ion battery cell into the drying box group, perform the first vacuuming operation on the drying box group, so that the air pressure in the drying box group reaches -0.085Mpa, and perform the pre-exhaust operation;

[0058] A3. Pass gaseous nitrogen with dry working temperature into the drying box group, and perform cycle ventilation drying operation;

[0059] A4. Carry out the second vacuuming operation on the drying box group, so that the air pressure in the drying box group reaches -0.075Mpa, and perform a deep exhaust operation;

[0060] A5. When the dew point in the drying oven group is higher than -30°C, execute step A3 and step A4 cyclically, and perform compensation heating operation on the gaseous nitrogen, so that the gaseous nitrogen is at 70°C, and execute step A3 and step cyclically The frequency of A4 is 6 tim...

Embodiment 2

[0065] B1. Convert liquid helium into gaseous helium, and heat up the gaseous helium to obtain gaseous helium at 65°C;

[0066] B2. Put the lithium-ion battery cell into the drying box group, perform the first vacuuming operation on the drying box group, so that the air pressure in the drying box group reaches -0.090Mpa, and perform the pre-exhaust operation;

[0067] B3. Pass the gaseous helium with dry working temperature into the drying box group, and perform the cycle ventilation drying operation;

[0068] B4. Carry out the second vacuuming operation on the drying box group, so that the air pressure in the drying box group reaches -0.080Mpa, and perform a deep exhaust operation;

[0069] B5. When the dew point in the drying oven group is higher than -35°C, step B3 and step B4 are executed cyclically, and the gaseous helium is compensated and heated so that the gaseous helium is at 65°C, and step B3 is executed cyclically And the number of times of step B4 is 7 times, and ...

Embodiment 3

[0074] C1. Convert liquid helium into gaseous helium, and heat up the gaseous helium to obtain gaseous helium at 75°C;

[0075] C2. Put the lithium-ion battery cell into the drying box group, perform the first vacuuming operation on the drying box group, make the air pressure in the drying box group reach -0.095Mpa, and perform the pre-exhaust operation;

[0076] C3. Pass the gaseous helium with dry working temperature into the drying box group, and perform the cycle ventilation drying operation;

[0077] C4. Carry out the second vacuuming operation on the drying box group, so that the air pressure in the drying box group reaches -0.065Mpa, and perform a deep exhaust operation;

[0078] C5. When the dew point in the drying oven group is higher than -30°C, execute step C3 and step C4 cyclically, and perform compensation heating operation on the gaseous helium, so that the gaseous helium is under the condition of 75°C, and execute step C3 cyclically And the number of times of s...

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Abstract

The invention relates to a method for drying a lithium ion battery cell before liquid injection. The method comprises the steps of converting liquid inert gas into gaseous inert gas, and then carryingout temperature rising operation to obtain the gaseous inert gas with a drying working temperature; putting the lithium ion battery cell into a drying box group, and carrying out first vacuumizing operation on the drying box group; introducing the gaseous inert gas with the drying working temperature into the drying box group, and carrying out circulating aeration drying operation; next, carryingout second vacuumizing operation on the drying box group, when the dew point in the drying box group is higher than the target dew point value, circularly executing the circulating aeration drying operation and the second vacuumizing operation, and compensating and heating the gaseous inert gas; stopping executing the circulating aeration drying operation and the second vacuumizing operation whenthe dew point in the drying box group is lower than or equal to the target dew point value; and finally, carrying out the circulating aeration cooling operation. Therefore, energy can be saved, the temperature of the drying gas is more stable, and the drying efficiency of the lithium ion battery cell is higher.

Description

technical field [0001] The invention relates to the technical field of preparation of lithium-ion batteries, in particular to a method for drying lithium-ion battery cells before liquid injection. Background technique [0002] In the process of producing lithium-ion batteries, in order to ensure that there is no moisture in the lithium-ion battery cells to avoid battery short circuit or safety accidents, the cells need to be dried and baked to remove the inside before injecting electrolyte into the cells. of moisture. [0003] In order to remove the moisture in the cell, vacuum baking is usually used and high-purity inert gas, such as nitrogen or argon, is injected into the cell intermittently. After the vacuum in the cell is broken, vacuuming is carried out again to bring Remove the moisture in the baked battery cells, but the entire process of removing moisture takes a very long time, it takes about 16 hours to 24 hours, and to obtain a lithium-ion battery cell that meets...

Claims

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Application Information

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IPC IPC(8): F26B5/04F26B9/06F26B21/00F26B23/00H01M10/058H01M10/0525
CPCF26B5/04F26B9/06F26B21/00F26B23/00H01M10/0525H01M10/058Y02E60/10Y02P70/50
Inventor 曾贤华戴建勇黄锐升罗良丰李路强刘志伟
Owner HUIZHOU HENGTAI TECH
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