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Lithium ion battery cell drying method and lithium ion battery

A technology of lithium ion battery and drying method, which is applied in the direction of static material dryer, drying solid material, local stirring dryer, etc., can solve the problem of unsatisfactory drying effect, achieve the goal of improving drying efficiency, saving energy, and preventing aging Effect

Active Publication Date: 2013-10-09
奇瑞新能源汽车股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, vacuum drying, blast drying, etc. are mostly used for drying the battery cells, but the drying effect is not ideal

Method used

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  • Lithium ion battery cell drying method and lithium ion battery
  • Lithium ion battery cell drying method and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The present embodiment provides a kind of drying method of the cell of lithium-ion battery, comprises the following steps:

[0027] (1) Place the battery cells to be dried in a closed cavity, and vacuumize the cavity. After the vacuum degree in the cavity reaches -0.1MPa, continue to vacuum for 5 minutes, and then stop vacuuming. In this embodiment, the closed cavity is the cavity inside the vacuum drying oven. Wherein, the battery cell includes a positive electrode sheet, a negative electrode sheet, a diaphragm and a casing, and the positive electrode sheet, the negative electrode sheet and the separator are all arranged in the casing, and the casing is not sealed. Since the casing is equipped with a diaphragm, and the diaphragm is prone to aging when it is continuously heated at high temperature, so in the whole process of drying the cell, the heating temperature of the cell is generally not more than 100°C, and the diaphragm with the lowest heat resistance inside the...

Embodiment 2

[0036] The present embodiment provides a kind of drying method of the cell of lithium-ion battery, comprises the following steps:

[0037] (1) Place the battery cell to be dried in a closed cavity, and vacuumize the cavity. After the vacuum degree in the cavity reaches -0.12MPa, continue to vacuum for 3 minutes, and then stop vacuuming. In this embodiment, the closed cavity is the cavity inside the vacuum drying oven.

[0038](2) The battery cell is heated, the heating temperature is 75° C., and the heating time is 4 hours. In the process of heating the cell, if the vacuum degree in the cavity reaches -0.05MPa, the cavity is vacuumed at the same time, and after the vacuum degree in the cavity reaches -0.12MPa , continue vacuuming for 10 minutes, and then stop vacuuming. During the heating process, the vacuum degree in the cavity is detected in real time. When the vacuum degree in the cavity reaches -0.05MPa, it means that a certain amount of water vapor in the battery core h...

Embodiment 3

[0045] The present embodiment provides a kind of drying method of the cell of lithium-ion battery, comprises the following steps:

[0046] (1) Place the cell to be dried in a closed cavity, and vacuumize the cavity. After the vacuum degree in the cavity reaches -0.11MPa, continue to vacuum for 10 minutes, and then stop vacuuming. In this embodiment, the closed cavity is the cavity inside the vacuum drying oven. Wherein, the battery cell includes a positive electrode sheet, a negative electrode sheet, a diaphragm and a casing, and the positive electrode sheet, the negative electrode sheet and the separator are all arranged in the casing, and the casing is not sealed.

[0047] (2) The battery cell is heated, the heating temperature is 82° C., and the heating time is 5 hours. In the process of heating the cell, if the vacuum degree in the cavity reaches -0.04MPa, then the cavity is evacuated at the same time, and after the vacuum degree in the cavity reaches -0.11MPa , continue...

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Abstract

The invention discloses a lithium ion battery cell drying method and a lithium ion battery. The method includes the following steps that a battery cell is placed in a closed cavity, vacuum pumping is conducted on the cavity, and the vacuum pumping operation lasts for 3-10 minutes after the vacuum degree in the cavity reaches-0.1--0.12 MPa; the battery cell is heated at the temperature ranging from 75-85 DEG C for 2-5 hours; non-oxide gas is inflated in the cavity until the vacuum degree in the cavity reaches-0.01--0.02 MPa; the battery cell is heated at the temperature ranging from 75-85 DEG C for 20-40 minutes; vacuum pumping is conducted on the cavity, and the vacuum pumping operation lasts for 3-10 minutes after the vacuum degree in the cavity reaches-0.1--0.12 MPa. The vacuum pumping operation and gas changing are conducted in a step-by-step mode, so that energy is greatly saved, and drying efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of preparation of lithium-ion batteries, and in particular relates to a method for drying batteries of lithium-ion batteries and the lithium-ion batteries. Background technique [0002] Lithium-ion batteries have the characteristics of high energy, long cycle life, stable structure, good safety performance, no toxic substances, and no pollution to the environment. They are currently widely used in electronic instruments, digital and home appliances (such as mobile phones, digital cameras, notebook computers, etc.) etc.), but also suitable for the preparation of high-capacity and high-power power lithium-ion batteries. [0003] In the manufacturing process of lithium-ion batteries, the internal pole pieces of lithium-ion batteries are very easy to absorb water, which will cause the water contained in lithium-ion batteries to react with the electrolyte of lithium-ion batteries during the charging and dischargi...

Claims

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Application Information

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IPC IPC(8): F26B7/00F26B9/06H01M10/058
CPCY02E60/10Y02P70/50
Inventor 徐洋洋
Owner 奇瑞新能源汽车股份有限公司
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