Staged baking process for water content in pole group of lithium ion battery

A lithium-ion battery and baking process technology, which is applied in electrode manufacturing, secondary batteries, circuits, etc., can solve the problems of single battery baking mode, low battery baking efficiency, and high moisture content in pole pieces. Baking time is shortened, cost output is reduced, and baking efficiency is improved

Inactive Publication Date: 2019-06-14
NANJING GUOXUAN BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the production process of the battery cell, the moisture contained in the battery cell will seriously affect the electrical performance of the battery, and the existing baking mode of the battery cell is single: the baking process time is as long as 40-60 hours, the baking efficiency of the battery cell is low, and the production capacity Tension, high cost output, and the moisture content of the pole piece is still high after baking, which affects the electrical performance of the battery

Method used

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  • Staged baking process for water content in pole group of lithium ion battery

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Comparison scheme
Effect test

Embodiment 1

[0024] The present invention proposes a lithium-ion battery pole group moisture staged baking process, comprising the following steps:

[0025] S1. Put a total of 1008 LFP20100140-30AH square lithium-ion battery cells on a 4-layer baking tray into the oven, close the oven door; PLC controls the ceramic heating plate in the oven to start heating, and at the same time controls the vacuum pump to transfer the air in the oven Extraction, the temperature and pressure values ​​in the oven are detected by the sensor in real time, and the data is transmitted to the PLC;

[0026] S2. After the oven is evacuated to a vacuum of 150Pa and the temperature is heated to 95°C, heat-preserve and pressurize and bake for 15 minutes, fill in nitrogen heated to 95°C to adjust the pressure to normal pressure, and keep the temperature at 95°C and bake for 15 minutes;

[0027] S3, repeating the operation of S2 10 times;

[0028] S4. Vacuum the oven to 200Pa, keep the temperature at 95°C, bake for 30...

Embodiment 2

[0034] The present invention proposes a lithium-ion battery pole group moisture staged baking process, comprising the following steps:

[0035] S1. Send the battery cells into the oven, and vacuumize the oven while heating;

[0036] S2. Adjust the temperature of the oven to 100°C and bake for 20 minutes at a vacuum of 100Pa, then pass in nitrogen to adjust the pressure to normal pressure, and bake at a temperature of 90°C for 20 minutes;

[0037] S3, repeating the operation of S2 8 times;

[0038] S4. Vacuum the oven to 200 Pa and keep the temperature of 90°C for 35 minutes, then pass nitrogen gas to adjust the pressure to normal pressure, and keep the temperature of 90°C for 20 minutes;

[0039] S5, repeating the operation of S4 5 times;

[0040] S6. After the oven is evacuated to 200Pa, the heating is stopped and cooled naturally.

Embodiment 3

[0042] The present invention proposes a lithium-ion battery pole group moisture staged baking process, comprising the following steps:

[0043] S1. Send the battery cells into the oven, and vacuumize the oven while heating;

[0044] S2. Adjust the temperature of the oven to 90°C and bake for 10 minutes at a vacuum of 200Pa, then pass in nitrogen to adjust the pressure to normal pressure, and bake at a temperature of 100°C for 10 minutes;

[0045] S3, repeating the operation of S2 12 times;

[0046] S4. Vacuum the oven to 100Pa and bake at a temperature of 100°C for 25 minutes, then pass nitrogen gas to adjust the pressure to normal pressure, and bake at a temperature of 100°C for 10 minutes;

[0047] S5, repeating the operation of S4 6 times;

[0048] S6. After the oven is evacuated to 100Pa, the heating is stopped and cooled naturally.

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Abstract

The invention discloses a staged baking process for water content in a pole group of a lithium ion battery, which comprises the following steps: S1, sending a battery cell into an oven, heating the oven and vacuuming; S2, adjusting the temperature of the oven to 90-100 DEG C and baking for 10-20 min under the vacuum degree of 100-200 Pa, introducing nitrogen to adjust the temperature to normal pressure, and baking for 10-20 min at the temperature of 90-100 DEG C; S3, repeating S2 for 8-12 times; S4, vacuuming the oven to 100-200 Pa, keeping the temperature of 90-100 DEG C, baking for 25-35 min, introducing nitrogen, adjusting the pressure to normal pressure, and keeping the temperature of 90-100 DEG C, baking for 10-20 min; S5, repeating S4 for 5-6 times; and S6, vacuuming the oven to 100-200 Pa, stopping heating, and cooling. The staged baking process for the pole group water of the lithium ion battery can reduce the baking time of the battery cell and the water content in the pole group of the battery core.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to an electrode group moisture-staged baking process for lithium-ion batteries. Background technique [0002] Lithium-ion batteries, as a representative of new energy sources, have the characteristics of high discharge efficiency, high energy density, small self-discharge, and high capacity retention, and have been widely used in various fields. In the production process of the battery cell, the moisture contained in the battery cell will seriously affect the electrical performance of the battery, and the existing baking mode of the battery cell is single: the baking process takes as long as 40-60 hours, the baking efficiency of the battery cell is low, and the production capacity Tension, the cost output is high, and the moisture content of the pole piece is still high after baking, which affects the electrical performance of the battery. Contents of the invention [0...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0525H01M4/04
CPCY02E60/10
Inventor 王翔韩明凯姚汪兵
Owner NANJING GUOXUAN BATTERY CO LTD
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