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Spraying method of insulating layer and application of insulating layer in battery shell

A technology for battery shells and insulating layers, which is applied to battery components, circuits, coatings, etc., can solve the problems of easy bubbles, lack of operability, and easy penetration of water in the insulating film, and achieve good adhesion and reliability Strong operability, solving the effect of unreliable adhesion

Active Publication Date: 2021-06-11
HUBEI JINQUAN NEW MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, this patent has the following defects and deficiencies: (1) Bubbles are prone to appear in the insulating film during the application process. Under high voltage conditions, the air in the bubbles is found to ionize and break down insulating films such as PET films: (2) Long-term high temperature, In a high-humidity environment, moisture is easy to seep between the battery case and insulating films such as PET films, resulting in a decrease in the viscosity of the glue, peeling off of insulating films such as PET films, and insulation failure; (3) Paste insulating films such as PET films on the surface of the battery case, It requires a lot of labor and does not meet the economic requirements
Although this invention can meet the insulation requirements of the battery case, it does not state how to clamp the insulating layer on the surface of the battery case, and which part of the battery should be applied by the clamp carrying the battery so that the outer surface of the battery can be surface-coated. Overwhelming, lack of operability

Method used

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  • Spraying method of insulating layer and application of insulating layer in battery shell
  • Spraying method of insulating layer and application of insulating layer in battery shell
  • Spraying method of insulating layer and application of insulating layer in battery shell

Examples

Experimental program
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Effect test

Embodiment 1

[0095] This embodiment provides a method for spraying the insulating layer on the outside of the battery case, the spraying method comprising the following steps:

[0096] Use a sealing fixture to fix it 1mm downward from the mouth of the outer surface of the square aluminum shell, and spray the insulating powder coating by electrostatic powder spraying. The spraying amount is controlled at 30g / min, the spraying distance is 100cm, and the voltage is 4kV. for 1 min, and then cured at 180° C. for 20 min to obtain the battery casing.

[0097] In the battery case obtained in this example, the thickness of the insulating layer was 80 μm.

Embodiment 2

[0099] This embodiment provides a method for spraying the insulating layer on the outside of the battery case, the spraying method comprising the following steps:

[0100] Use a sealing fixture to fix it 3mm downward from the mouth of the outer surface of the steel shell, and use electrostatic powder spraying to spray the insulating powder coating. The spraying amount is controlled at 40g / min, the spraying distance is 110cm, the voltage is 5kV, and the time is . 2 minutes, and then cured at 210° C. for 10 minutes to obtain the battery casing.

[0101] The thickness of the insulating layer of the battery case obtained in this example is 120 μm.

Embodiment 3

[0103] This embodiment provides a method for spraying the insulating layer on the outside of the battery case, the spraying method comprising the following steps:

[0104] Use a sealing fixture to fix it 6mm downward from the mouth of the outer surface of the steel shell, and use electrostatic powder spraying to spray the insulating powder coating. The spraying amount is controlled at 50g / min, the spraying distance is 120cm, the voltage is 6kV, and the time is . 3 minutes, and then cured at 250° C. for 5 minutes to obtain the battery casing.

[0105] In the battery case obtained in this example, the thickness of the insulating layer was 150 μm.

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Abstract

The invention relates to a spraying method of an insulating layer and application of the insulating layer in a battery shell. The spraying method comprises the following steps: spraying an insulating powder coating on the outer surface of the battery shell by adopting an electrostatic powder spraying method, and performing curing to form the insulating layer. An electrostatic powder spraying method is adopted, the insulating powder coating is sprayed on the outer surface of the battery shell to form the insulating layer, the adhesive force between the insulating layer and the battery shell is good, the insulating layer can tolerate a long-term high-temperature and high-humidity environment, and the problems that in the prior art, adhesion between an insulating film and the battery shell is not reliable and the like are solved.

Description

technical field [0001] The invention relates to the field of battery technology, in particular to a method for spraying an insulating layer and its application in a battery case. Background technique [0002] Batteries play a unique role in the fields of electronic equipment and new energy vehicles. Their service life and safety performance are not only affected by electrode materials, but also by the structure and performance of the battery case, especially the insulation performance. In order to prevent safety issues such as scratches or short circuits on the surface of the battery case, an insulating layer is generally provided on the surface of the battery case. [0003] At present, there are mainly two methods for setting the insulating layer on the surface of the battery: one is to apply an insulating film such as PET to the outer surface of the battery case after the battery is assembled, and the other is to coat the surface of the battery with an insulating resin mat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B05D5/12B05D1/06B05D3/00B05D3/02H01M50/124H01M50/14
CPCB05D5/12B05D1/06B05D3/002B05D3/0218B05D3/0254
Inventor 黄利明李开波陈星宇何巍
Owner HUBEI JINQUAN NEW MATERIALS CO LTD