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Baking curve construction method and baking method of lithium ion battery pole pieces

A lithium-ion battery and battery pole piece technology, which is applied in the field of lithium-ion battery processing and manufacturing, can solve problems such as difficult to ensure qualified moisture, re-baking, and difficult to optimize the baking time, so as to save baking time and energy consumption, The effect of improving baking efficiency

Active Publication Date: 2020-08-04
华鼎国联四川动力电池有限公司
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although the above-mentioned conventional vacuum baking process can solve the problem of dehydration of most lithium-ion battery pole pieces, it is difficult to ensure the initial moisture content due to the different initial moisture content of the same system and different batches of pole pieces before baking. The moisture content of pole pieces with high content is qualified after baking
Usually, it is necessary to test the moisture content after the baking is completed. If it is judged to be unqualified, it needs to be baked again, which seriously affects the production efficiency.
[0005] More importantly, when replacing the battery pole piece with a new material system for baking, it is usually difficult to directly select the optimal baking time of the new system. The results of multiple tests have determined the optimal baking conditions; moreover, in the subsequent practical application of this baking condition, there will still be the aforementioned problem that batches of pole pieces with high initial moisture content fail to pass the baking and need to be baked again

Method used

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  • Baking curve construction method and baking method of lithium ion battery pole pieces
  • Baking curve construction method and baking method of lithium ion battery pole pieces

Examples

Experimental program
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Effect test

Embodiment 1

[0034] This embodiment is aimed at baking the lithium-ion battery pole piece of graphite negative electrode material.

[0035] Take a sample of the negative pole piece to be baked, the size of the sample has no effect, use the Karl Fischer moisture tester to test the initial moisture content of the pole piece before baking, and record it as A0 = 838ppm; and take the same batch and the same The pole pieces preserved under storage conditions were loaded into a high-vacuum oven according to the predetermined baking quantity of 27,000 pieces, and set aside. In this embodiment, the pole piece baking setting conditions with different initial moisture contents are exactly the same, and the temperature, pressure, and quantity conditions are completely consistent with the initial curve construction, so that they can be used as the cut-off conditions for subsequent baking processes, and There is no special requirement for the initial moisture content in the curve construction stage, and...

Embodiment 2

[0048] This embodiment is aimed at baking the lithium-ion battery pole piece made of nickel-cobalt-manganese ternary material.

[0049] Take a sample of the positive pole piece to be baked, use the Karl Fischer moisture tester to test the initial moisture content of the pole piece before baking, and record it as A0=440ppm; 27,000 pieces are loaded into a high-vacuum oven according to the predetermined baking quantity and set aside.

[0050] Vacuumize the drying chamber of the oven to ≤200Pa, fill it with nitrogen, and preheat at a preheating temperature of 130°C for 5 hours under the protection of nitrogen, so that all pole pieces in the drying chamber reach a drying temperature of 130°C.

[0051] Under the condition of 130°C heat preservation, the drying chamber was further evacuated to an initial pressure value of 50Pa. At this time, the pole piece had begun to dewater, and the pressure in the drying chamber gradually increased to 200Pa. During this process, the pressure was...

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Abstract

The invention belongs to the technical field of lithium ion battery processing and manufacturing, particularly relates to a baking curve construction method based on lithium ion battery pole pieces made of different materials, and further discloses a baking method of the lithium ion battery pole pieces. According to the baking curve construction method and the baking method of the lithium ion battery pole piece, firstly, the baking pressure change rate curves of different material systems are obtained through one-time experiment and data analysis, the water removal rate in the baking process is represented through the pressure change rate, the proper pressure change rate is selected as the baking ending condition, the vacuum baking time is correspondingly and automatically adjusted, the pole piece baking condition of a new material system can be rapidly determined, the method can be used for one-time effective baking of pole pieces with different initial water containing conditions, and the baking efficiency is effectively improved.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery processing and manufacturing, and in particular relates to a method for constructing a baking curve based on different materials for lithium-ion battery pole pieces, and further discloses a baking method for lithium-ion battery pole pieces. Background technique [0002] During the processing and manufacturing of lithium-ion batteries, since moisture will have adverse effects on the performance of the battery such as gas production, capacity, internal resistance, and cycle, it is necessary to remove the moisture in the pole pieces through the baking process to ensure that the moisture content in the battery is lower than Certain standards to ensure the performance of the battery. [0003] In the prior art, the dehydration method of lithium-ion battery pole pieces is generally by placing them in a vacuum oven and setting a certain temperature, vacuum degree, and time to bake the pole pie...

Claims

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Application Information

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IPC IPC(8): F26B5/04F26B25/00F26B25/22H01M10/0525G06T11/20
CPCF26B5/04F26B25/00F26B25/22G06T11/203H01M10/0525Y02E60/10
Inventor 安莎李卫红沈修岗
Owner 华鼎国联四川动力电池有限公司
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