Drying method of lithium-ion battery electric core

A lithium-ion battery and drying method technology, which is applied in the direction of drying solid materials, electrolyte storage battery manufacturing, non-aqueous electrolyte storage battery, etc., can solve the problems of long drying time, air permeability change, battery separator shrinkage, etc., and simplify the operation process , The effect of reducing the labor load

Active Publication Date: 2012-10-17
DONGGUAN AMPEREX TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to improve the problem of long drying time, process improvement personnel generally adopt the method of increasing the temperature to accelerate the evaporation of water, but with the increase of temperature, it will bring about negative effects such as shrinkage of the battery separator, changes in air permeability, and battery deformation.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] An ultra-thick battery cell 904586 wound by cathode, anode, and diaphragm, put it into a packaging case, seal on three sides, and leave one side open for drying water and filling electrolyte. This batch of batteries to be packaged The core is placed in a drying oven (that is, placed in a closed cavity), and the drying oven can realize a cavity with a vacuum degree greater than 98% and a temperature greater than or equal to 120°C. , The gas in the drying furnace is dry air. First, the furnace cavity of the drying furnace is heated up to 60°C, and the temperature is kept constant. Apply the drying method of the present invention to vacuumize and detect the vacuum degree in the furnace. When the vacuum degree is less than -96KPa, delay the timer and keep it for 15 minutes. Unload the vacuum, then delay for 1 minute, repeat the above vacuuming and vacuuming actions, form a circulating gas flow in the drying furnace, cycle 20 times, then enter the vacuum drying stage, vacuum...

Embodiment 2

[0023] The difference from Example 1 is that the drying gas filled in the drying furnace is nitrogen, the constant temperature is 100°C, the delay treatment time is 10 minutes, and the cycle is 22 times. After entering the vacuum drying stage, keep it for 200 minutes. The drying time is 7 hours. Summarizing the water content test results of 15 batches, the average water content is 110.1ppm.

Embodiment 3

[0025] The difference from Example 1 is that the constant temperature is 30°C, the delayed treatment time is 5 minutes, and the cycle is 50 times. After entering the vacuum drying stage, it is kept for 410 minutes. The drying time of the process is 11 hours, and 15 batches of water are summarized. As a result of the content test, the average water content is 128.3ppm.

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Abstract

The invention relates to the field of battery manufacturing and particularly relates to a drying method of a lithium-ion battery electric core. The method comprises the following steps that: the electric core to be dried is placed in a closed cavity; constant temperature of the cavity is set; multiple times of vacuum pumping and vacuum relieving are cyclingly carried out; and a cycling air flow is formed in the closed cavity and the electric core is dried. When the lithium-ion battery electric core adopts the drying method provided by the invention, cycling of air pumping and air changing is introduced in the process of vacuum drying, and water content in the lithium-ion battery electric core can be reduced in a relatively short period of time, and operation processes are simplified and work load of an operator is reduced.

Description

technical field [0001] The invention relates to the field of battery manufacturing, in particular to a method for drying lithium-ion battery cells. Background technique [0002] Since the advent of lithium-ion batteries in the 1990s, they have developed very rapidly in more than ten years. With the continuous expansion of the application range of lithium-ion batteries, the requirements for their application conditions are becoming more and more stringent. Among them, the control of water content is an important process control parameter that affects the performance of lithium batteries. How to reduce the water content in the battery and shorten the time spent in the battery drying process is a problem to be improved in the battery manufacturing process. [0003] In order to solve this problem, the traditional battery drying method is: under the condition of maintaining a certain temperature, extracting vacuum drying to remove moisture. The moisture in the electrode sheet ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F26B5/04H01M10/058
CPCY02E60/12Y02E60/10Y02P70/50
Inventor 陈刚赖建新彭彦彰陈颜施晔涛
Owner DONGGUAN AMPEREX TECH
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