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A method for testing the packaging effect of soft pack batteries

A soft-pack battery and inspection method technology, which is applied in the direction of measuring devices, using stable tension/pressure to test material strength, material defect testing, etc., can solve the problem of not being able to reflect whether there are pores at the microscopic level, whether the combination is firm, or not being observed , can not be effectively reflected and other problems, to achieve the effect of balanced force, saving time and labor, and high operability

Active Publication Date: 2021-11-09
CHINA AUTOMOTIVE BATTERY RES INST CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The recorded value of the tensile force is the maximum value, and the peel strength of the defective package that is prone to leakage should be lower than the normal package strength, and the recorded maximum value cannot effectively reflect this.
The latter two methods can only make a rough judgment, and cannot reflect whether there are pores at the microscopic level or whether the combination is firm
Direct visual inspection can only be judged by whether there are dead folds on the surface. The peeled surface after peeling is the layer with the weakest bond. After the dry-process aluminum-plastic film is peeled off, the aluminum layer and the PP layer are often peeled off directly. There is a gap between the two PP layers. Possible gaps are basically invisible

Method used

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  • A method for testing the packaging effect of soft pack batteries

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] (1) inject 100g of water into the battery intermediate product after primary packaging;

[0037] (2) Carry out secondary encapsulation directly to it;

[0038] (3) if figure 1 As shown, two transparent PC boards 002, 003 are used to stick to the top and bottom of the battery under test 001, and the two PC boards 002, 003 are fixed with six pairs of bolts and nuts 004, and the distance between the two boards is 11mm;

[0039] (4) Put the battery clamped by the splint into the oven and start heating from room temperature (25°C) at a heating rate of 5°C / min. After heating to 100°C, it becomes heat preservation, and the temperature in the oven is kept at 100±2°C;

[0040] (5) Record the time from the start of the oven heat preservation to the thermal expansion breach of the battery. If the time is greater than 8 minutes, it is qualified. If it is lower than this value, the packaging is unqualified. Record the position of the breach and give feedback to improve the packagin...

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Abstract

The invention relates to a packaging effect inspection method of a soft-pack battery, comprising the following steps: (1) injecting a certain amount of water into a battery intermediate product after primary packaging; (2) directly performing secondary packaging on it; (3) using two The rectangular plate is attached to the upper and lower sides of the test battery, fixed and placed in an oven for baking; (4) Baking at a high temperature until the water in the battery is vaporized and pressurized to cause the aluminum-plastic film to rupture, record the time of the crack and the distance of the crack on the battery. Location. The inspection method of the present invention replaces the electrolyte with water or alcohol, which is more environmentally friendly and has higher operability. The packaging failure of the battery in the actual use process is quickly simulated by heating, and then the process parameters are changed or the equipment is adjusted according to the results. .

Description

technical field [0001] The invention relates to a packaging effect inspection method of a soft pack battery, which belongs to the technical field of lithium ion battery manufacturing. Background technique [0002] In recent years, the replacement of electronic products is getting faster and faster, especially the life cycle of consumer electronic products such as mobile phones and notebook computers is gradually shortening, so the demand for soft-pack lithium batteries used is also increasing. At present, the vast majority of soft-pack lithium batteries are packaged with aluminum-plastic film, which is mainly composed of nylon layer, aluminum layer and PP layer. After the positive and negative electrodes are transferred from the production area to the assembly area, the positive and negative electrodes and the separator together form a battery core package. After the core package and tabs are welded, they are placed in an aluminum-plastic film for primary packaging, and then...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N25/72G01N3/12
CPCG01N3/12G01N25/72G01N2203/0003G01N2203/0019G01N2203/0044G01N2203/0067
Inventor 赵元宇李翔王曦
Owner CHINA AUTOMOTIVE BATTERY RES INST CO LTD
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