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Method for improving cell infiltration efficiency

A cell and efficiency technology, applied in circuits, electrical components, secondary batteries, etc., can solve the problems affecting the electrical performance and production efficiency of the cell, affecting the cell wetting efficiency, and insufficient wetting of the pole piece, etc. Long standing time at high temperature, shortening high temperature wetting time, and improving the effect of long wetting time

Pending Publication Date: 2022-01-18
NINGBO VEKEN BATTERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A key problem facing the current situation is the insufficient wetting of the pole piece after the cell is injected with liquid, and the wetting efficiency is low, which affects the electrical performance and production efficiency of the cell.
[0003] In addition, the existing process directly infiltrates the battery cell at high temperature after the liquid injection process. Due to the sticking of the pole piece inside the battery cell, the wetting of the pole piece will be insufficient, the overall wetting effect will be poor, and the wetting efficiency of the battery cell will be affected. Long standing time, poor liquid retention, low production efficiency

Method used

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  • Method for improving cell infiltration efficiency
  • Method for improving cell infiltration efficiency

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] S1. After taking a letter, put the cell into the flow box for baking. After baking, the moisture value of the positive electrode sheet of the battery cell is required to be less than 100ppm, and the moisture value of the negative electrode sheet is less than 200ppm.

[0025] S2. Put the air bag of the battery cell after liquid injection upward, place it at an equal distance (2-3mm), and use a vacuum liquid injection machine to inject an appropriate amount of electrolyte inside the battery cell.

[0026] S3. Put the battery cell after liquid injection into three stages of vacuum standing. The first stage vacuum degree is -30Kpa, and the vacuum resting time is 2s; the second stage vacuum degree is -65Kpa, and the vacuum resting time is 5s; the third stage vacuum degree is - 90Kpa, vacuum standing time 7s; then use a vacuum pre-sealing machine to pre-seal the cell air bag.

[0027] S4. Place the pre-sealed cell air bag upwards and place it equidistantly (2-3mm) in the cavi...

Embodiment 2

[0031] S1. After taking a letter, put the cell into the flow box for baking. After baking, the moisture value of the positive electrode sheet of the battery cell is required to be less than 100ppm, and the moisture value of the negative electrode sheet is less than 200ppm.

[0032] S2. Put the air bag of the battery cell after liquid injection upward, place it at an equal distance (2-3mm), and use a vacuum liquid injection machine to inject an appropriate amount of electrolyte inside the battery cell.

[0033] S3. Put the battery cell after liquid injection into two stages of vacuum standing, the first stage vacuum degree is -30Kpa, the vacuum resting time is 2s; the second stage vacuum degree is -65Kpa, the vacuum resting time is 5s; then use the vacuum pre-sealing machine Pre-seal the cell air bag.

[0034] S4. Place the pre-sealed cell air bag facing upwards, and place it in the cavity of the ultrasonic equipment equidistantly (2-3mm), use the ultrasonic device to perform u...

Embodiment 3

[0038] S1. After taking a letter, put the cell into the flow box for baking. After baking, the moisture value of the positive electrode sheet of the battery cell is required to be less than 100ppm, and the moisture value of the negative electrode sheet is less than 200ppm.

[0039] S2. Put the air bag of the battery cell after liquid injection upward, place it at an equal distance (2-3mm), and use a vacuum liquid injection machine to inject an appropriate amount of electrolyte inside the battery cell.

[0040] S3. Vacuum the battery cell after liquid injection, the vacuum degree is -30Kpa, and the vacuum standing time is 2s; then use a vacuum pre-sealing machine to pre-seal the cell air bag.

[0041] S4. Place the pre-sealed cell air bag facing upwards, and place it in the cavity of the ultrasonic equipment equidistantly (2-3mm), and use the ultrasonic device to perform ultrasonic treatment on the pre-sealed cell. The ultrasonic frequency is 70KHZ, and the ultrasonic time is 1...

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Abstract

The invention belongs to the technical field of lithium ion battery processing, and relates to a method for improving cell infiltration efficiency. By using the high-frequency vibration waves emitted by ultrasonic equipment, the wetting rate of a battery cell is increased, the wetting time is shortened, the wetting time of a pole piece after liquid injection of the battery cell is improved, the long high-temperature standing time of the battery cell in the prior art is improved, the high-temperature wetting time of the battery cell is shortened by about 50%, and meanwhile, the liquid retention capacity of the battery cell is increased by 5-10%.

Description

technical field [0001] The invention belongs to the technical field of lithium ion battery processing, and relates to a method for improving the wetting efficiency of battery cores. Background technique [0002] With the rapid development of the economy, the adequacy of the wetting of the electrolyte of the pouch battery on the electrode sheet is closely related to the efficiency of the cell's wetting, which exists in the process of standing after the cell is injected. The adequacy of electrode wetting directly determines the cell wetting efficiency. A key problem facing the current situation is that the pole pieces are not sufficiently wetted after the cell is injected with liquid, and the wetting efficiency is low, which affects the electrical performance and production efficiency of the cell. [0003] In addition, the existing process directly infiltrates the battery cell at high temperature after the liquid injection process. Due to the sticking of the pole piece inside...

Claims

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Application Information

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IPC IPC(8): H01M10/058H01M10/0525H01M50/609
CPCH01M10/058H01M10/0525H01M50/609Y02E60/10Y02P70/50
Inventor 田生伟张衡孟旭徐志伟陶胜张汪汪
Owner NINGBO VEKEN BATTERY