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Foil coating device

A coating device and foil technology, which is applied to devices and coatings that apply liquid to the surface, can solve problems such as poor regulation efficiency and regulation effect, safety accidents, and impact on battery capacity, and achieve improved consistency and efficiency. Coating operation efficiency, adjustment accuracy and high degree of automation, and the effect of improving the practicability of the device

Active Publication Date: 2022-06-17
SVOLT ENERGY TECHNOLOGY CO LTD
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AI Technical Summary

Problems solved by technology

Among them, the uniformity of the coating surface density of the foil is a key indicator of the coating quality. It is very important to improve the electrical performance and ensure the safety of the battery. Not up to the standard; if the negative electrode coating surface density consistency is poor, it will lead to poor battery electrode interface, which will lead to safety accidents
[0004] Based on the current lithium battery production process, when the foil coating process is performed, the viscosity of the slurry will change with time, such as agglomeration, or sometimes due to the poor filtering effect of the filtration system. Good, resulting in poor slurry fluidity and affecting coating quality
In particular, as the width of the foil corresponding to the coating becomes larger and larger, it is more difficult to ensure the consistency of the surface density of the foil coating
However, the existing coating device mainly adjusts the coating surface density by adjusting the screw of the die head, adjusting the pump speed of the feeding pump or adjusting the feeding and retreating of the die head. It is difficult to solve the above problems well, and online adjustment cannot be realized. Partial coating area density, regulation efficiency and poor regulation effect

Method used

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Embodiment Construction

[0041] It should be noted that the embodiments of the present invention and the features of the embodiments may be combined with each other under the condition of no conflict.

[0042] In the description of the present invention, it should be noted that if terms such as "upper", "lower", "inside", and "back" appear to indicate orientation or positional relationship, they are based on the orientation or positional relationship shown in the accompanying drawings. , is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. In addition, if terms such as "first" and "second" appear, they are only used for descriptive purposes, and should not be construed as indicating or implying relative importance.

[004...

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Abstract

The invention provides a foil coating device, which is used for coating conveyed foils. In terms of overall structure, it includes a feeding mechanism, a coating die head mechanism, a surface density detection mechanism and a control mechanism. Wherein, the feeding mechanism has a slurry storage unit, and a pumping unit connected to the slurry storage unit for pumping the slurry. The coating die head mechanism has a coating die head, a feeding pipe and a return pipe. The feeding pipe is connected to the pumping unit, and the return pipe is connected to the slurry storage unit. Connected with a regulating valve, the coating port of the coating die head is divided into multiple sections corresponding to each feeding pipe one by one. The areal density detecting mechanism is arranged corresponding to the foil to collect the areal density of the coated foil. The control mechanism is connected with the surface density detection mechanism, the pumping unit and each regulating valve. The foil coating device of the invention can adjust the coating surface density on-line, effectively improves the coating operation efficiency, and has strong device practicability.

Description

technical field [0001] The invention relates to the technical field of foil coating equipment, in particular to a foil coating device. Background technique [0002] With the in-depth implementation of the national sustainable development strategy, as a prominent member of the new energy industry, the development of lithium batteries has attracted more and more attention from all walks of life, and has been applied to people's daily life, especially digital products, Automotive and other power tools and other industries. [0003] Coating is an important process in the production process of lithium batteries. Generally speaking, the active material is uniformly coated on the current collector (copper foil / aluminum foil) according to a certain weight. Called pole piece or foil) can be used in the next process. Among them, the consistency of the coating surface density of the foil is a key indicator of the coating quality. It is very important to improve the electrical perform...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B05C5/00B05C11/10B05C13/02
CPCB05C5/00B05C11/1002B05C11/1039B05C13/02
Inventor 马毅丁亚男苏夏
Owner SVOLT ENERGY TECHNOLOGY CO LTD
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