Battery core baking method

A cell baking and cell technology, which is applied in secondary battery manufacturing, sustainable manufacturing/processing, climate sustainability, etc. The problem of prolonging the baking time can achieve the effect of shortening the time, improving the baking efficiency of the cell, and improving the baking effect.

Active Publication Date: 2012-01-18
SHENZHEN CHAM BATTERY TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Under normal circumstances, vacuum baking is adopted, and high-purity gas (N 2 or Ar gas) to break the vacuum and then vacuum again to take away the moisture of the baked cells. The whole process takes about 16-20 hours, but the change of moisture concentration during the baking process is not considered.
In addition, it is not easy to preheat the battery cells in the initial stage of vacuum baking, resulting in prolonged baking time

Method used

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Examples

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Comparison scheme
Effect test

Embodiment 1

[0028] A method for baking batteries, comprising the steps of:

[0029] Step S11: Under the condition of vacuum degree of -0.03MPa, preheat the cell at 85°C for 3 hours; during the preheating process, raise the temperature at a rate of 4°C / min;

[0030] Step S12: Under the protection of nitrogen, decompress the preheated cell to normal pressure, let it stand for 2 minutes, vacuumize to -0.03MPa, and bake at 85°C for 3 hours;

[0031] Step S13: Vacuum the baked battery cell again to -0.09MPa, and then alternately decompress to normal pressure, stand still, and vacuumize in order to obtain the battery cell. The specific steps are:

[0032] In the first stage, within 3 hours after the baked cell is vacuumed to -0.09 again, the gas in the cell is decompressed to normal pressure every 30 minutes, rested for 2 minutes, and then vacuumed to -0.09MPa ;

[0033] In the second stage, within 3 hours after the first stage, decompress the gas in the cell to normal pressure every 1 hour, ...

Embodiment 2

[0036] A method for baking batteries, comprising the steps of:

[0037] Step S21: Under the condition of vacuum degree of -0.02MPa, preheat the cell at 90°C for 3 hours; during the preheating process, raise the temperature at a rate of 3°C / min;

[0038] Step S22: Under the protection of nitrogen, decompress the preheated cell to normal pressure, let it stand for 1 minute, then vacuumize to -0.05MPa, and bake at 90°C for 2 hours;

[0039] Step S23: Vacuum the baked battery cell again to -0.1MPa, and then alternately decompress to normal pressure, stand still, and vacuumize in order to obtain the battery cell. The specific steps are:

[0040] In the first stage, within 2 hours after the baked cell is vacuumed to -0.1 again, the gas in the cell is decompressed to normal pressure every 30 minutes, rested for 1 minute, and then vacuumed to -0.1MPa ;

[0041] In the second stage, within 2 hours after the first stage, decompress the gas in the cell to normal pressure every 1 hour, ...

Embodiment 3

[0044] A method for baking batteries, comprising the steps of:

[0045] Step S31: Under the condition of vacuum degree of -0.05MPa, preheat the cell at 80°C for 4 hours; during the preheating process, raise the temperature at a rate of 5°C / min;

[0046] Step S32: Under the protection of nitrogen, decompress the preheated cell to normal pressure, and after standing for 3 minutes, vacuumize to -0.02MPa, and bake at 90°C for 2 hours;

[0047] Step S33: Vacuum the baked battery cell again to -0.1 MPa, and then alternately decompress to normal pressure, stand still, and vacuumize in order to obtain the battery cell. The specific steps are:

[0048] In the first stage, within 2 hours after the baked cell is vacuumed to -0.1 again, decompress the gas in the cell to normal pressure every 30 minutes, stand still for 3 minutes, and then evacuate to -0.1MPa ;

[0049] In the second stage, within 2 hours after the first stage, decompress the gas in the cell to normal pressure every 1 ho...

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Abstract

The invention provides a battery core baking method. The method comprises steps that: under a vacuum degree of -0.02 to -0.05MPa, a battery core is preheated at a temperature of 80 to 90 DEG C; under the protection of inert gas, the preheated battery core is decompressed to normal pressure, settled for 1 to 3min, pumped to a state with vacuumed degree of -0.02 to -0.05MPa, and baked at a temperature of 80 to 90 DEG C; the baked battery core is then pumped to a state with a vacuum degree of -0.09MPa to -0.1MPa, and the processes of decompressing to normal temperature, settling, and vacuum pumping are orderly carried out alternatively, such that the battery core is obtained. During the battery core baking process, according to the changes of water content in the battery core, a step-wise baking method is adopted for carrying out vacuum baking upon the battery core, such that the battery core baking effect is effectively improved, the battery core baking time is reduced, and the battery core baling efficiency is improved. Also, the battery core baking method is simple, the baking condition is controllable. Therefore, the method is suitable for industrialized productions.

Description

technical field [0001] The invention belongs to the technical field of battery preparation, and in particular relates to a battery cell baking method. Background technique [0002] The battery cells currently produced need to be baked before filling. Under normal circumstances, vacuum baking is adopted, and high-purity gas (N 2 or Ar gas) to break the vacuum and then vacuum again to take away the moisture of the baked cells. The whole process takes about 16 to 20 hours, but the change of moisture concentration during the baking process is not considered. In addition, it is not easy to preheat the battery cells in the initial stage of vacuum baking, resulting in prolonged baking time. Contents of the invention [0003] The object of the present invention is to overcome the above-mentioned deficiencies of the prior art, and provide a method for baking cells with good baking effect and high efficiency. [0004] In order to achieve the above-mentioned purpose of the inventi...

Claims

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Application Information

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IPC IPC(8): H01M10/04
CPCY02E60/12Y02E60/10Y02P70/50
Inventor陈泽伟程建良王学雨
OwnerSHENZHEN CHAM BATTERY TECHNOLOGY CO LTD