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Method and device for detecting air tightness of aluminum-plastic film of battery

A detection method and technology of detection device, which are applied in the direction of liquid/vacuum measurement for liquid tightness, etc., can solve the problems of micro-cracks of aluminum layer and PP layer, complicated operation, rupture of aluminum-plastic film, etc., so as to shorten the air tightness. time, wide detection range and simple method

Pending Publication Date: 2021-06-25
KUNSHAN BAOTRON NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the aluminum-plastic film is also prone to corrosion and damage, thus losing its protective effect on the inside of the battery cell.
[0003] The aluminum-plastic film has the following disadvantages: a. From the perspective of the composition structure and packaging mechanism of the aluminum-plastic film, the internal PP layer plays the role of bonding and sealing. The brittleness increases during the solidification process, which affects the service life of the seal; b. During the process of punching the hole in the film, it is easy to cause excessive stretching of the hole position, and the aluminum layer and PP layer inside the aluminum-plastic film are prone to microscopic cracks; c. During cargo, transportation and assembly, bumps are prone to occur, causing the risk of aluminum-plastic film rupture or even leakage
However, this technology requires repeated cycles of vacuuming and filling with positive pressure, and there is a problem of complicated operation.

Method used

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  • Method and device for detecting air tightness of aluminum-plastic film of battery
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  • Method and device for detecting air tightness of aluminum-plastic film of battery

Examples

Experimental program
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Effect test

Embodiment 1

[0061] This embodiment provides a method for detecting the airtightness of the aluminum-plastic film of a battery, and the detection method includes:

[0062] When the battery is packaged, add electrolyte to the battery first and then add water. The amount of electrolyte added is 4% more than the standard electrolyte for battery injection, and the package is completed. The package condition is 185°C@2s. After adding water, the electrolysis The water content in the liquid is 2000ppm, and the packaged battery is placed in a water tank to be heated at a temperature of 50°C. The expansion volume of the battery is recorded, and the airtightness of the battery is tested.

Embodiment 2

[0064] This embodiment provides a method for detecting the airtightness of the aluminum-plastic film of a battery, and the detection method includes:

[0065] When the battery is packaged, add electrolyte to the battery first and then add water. The amount of electrolyte added is 4% more than the standard electrolyte for battery injection, and the package is completed. The package condition is 185°C@2s. After adding water, the electrolysis The water content in the liquid is 4000ppm, and the packaged battery is placed in a water tank to be heated at a temperature of 50°C. The expansion volume of the battery is recorded, and the airtightness of the battery is tested.

Embodiment 3

[0067] This embodiment provides a method for detecting the airtightness of the aluminum-plastic film of a battery, and the detection method includes:

[0068] When the battery is packaged, add electrolyte to the battery first and then add water. The amount of electrolyte added is 4% more than the standard electrolyte for battery injection, and the package is completed. The package condition is 185°C@2s. After adding water, the electrolysis The water content in the liquid is 6000ppm. The packaged battery is placed in a water tank and heated at a temperature of 50°C. The expansion volume of the battery is recorded and the airtightness of the battery is tested.

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Abstract

The invention provides a method and a device for detecting the air tightness of an aluminum-plastic film of a battery. The method comprises the steps of: adding electrolyte and water into a battery when the battery is packaged, completing packaging, putting the packaged battery into a water tank, heating, recording the expansion volume of the battery, and detecting the air tightness of an aluminum-plastic film of the battery. According to the invention, the battery is heated in the water tank, and the sealing effect between the structure of the aluminum-plastic film and a PP layer, the air tightness of the aluminum-plastic film and the air tightness between the aluminum-plastic film and a packaging tab can be tested by using a water bath method. Compared with a traditional inflation pressure explosion test, the detection range is wider, and the problem of local tearing caused by contact between an air tap of inflation equipment and the aluminum-plastic film can be effectively avoided. Besides, electrochemical corrosion is simulated by adjusting the addition amount of the electrolyte, the mass of water and the heating temperature, the time for detecting the air tightness of the aluminum-plastic film can be shortened, and the method has the characteristics of simplicity, rapidness in detection, high reliability and the like.

Description

technical field [0001] The invention belongs to the technical field of batteries, and relates to a method for detecting the airtightness of an aluminum-plastic film of a battery, in particular to a method and a device for detecting the airtightness of an aluminum-plastic film of a battery. Background technique [0002] The outer packaging material of the soft-packed battery is aluminum-plastic film. Compared with the welding process of the aluminum shell of the square battery, the use of aluminum-plastic film packaging can effectively reduce the weight of the battery and improve the mass energy density of the battery. However, the aluminum-plastic film is also prone to corrosion and damage, thus losing its protective effect on the inside of the battery cell. [0003] The aluminum-plastic film has the following disadvantages: a. From the perspective of the composition structure and packaging mechanism of the aluminum-plastic film, the internal PP layer plays the role of bondi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M3/02
CPCG01M3/02
Inventor 褚林波黄荣刚何欢平丽娜吕豪杰
Owner KUNSHAN BAOTRON NEW ENERGY TECH CO LTD
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