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Extrusion head for pole piece forming, forming device comprising extrusion head and forming method and preparation method of extrusion head

A technology of extrusion device and forming device, which is applied in the field of extrusion heads for forming special-shaped pole pieces, which can solve problems such as difficulty in ensuring the uniformity of pole piece thickness, low flash point of ethanol, powder drop of pole pieces, etc., and achieve excellent liquid absorption capacity , Improve thickness uniformity, and improve production efficiency

Pending Publication Date: 2020-12-11
EVE ENERGY CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The disadvantage of this molding method is that a large amount of organic solvent ethanol is used as the positive electrode molding agent in the process, and the low flash point of ethanol has certain safety risks in the operation and drying process
In addition, the positive electrode after absorbing ethanol is relatively wet and soft, and it is difficult to ensure the uniformity of the thickness of the electrode sheet after being rolled in a roller press. Moreover, the rapid volatilization of ethanol may easily lead to powder loss and hollowing of the electrode sheet

Method used

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  • Extrusion head for pole piece forming, forming device comprising extrusion head and forming method and preparation method of extrusion head
  • Extrusion head for pole piece forming, forming device comprising extrusion head and forming method and preparation method of extrusion head
  • Extrusion head for pole piece forming, forming device comprising extrusion head and forming method and preparation method of extrusion head

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preparation example Construction

[0087] In another specific embodiment, the present invention provides a kind of preparation method of pole piece, and described preparation method comprises:

[0088] The active material, binder and solvent are sequentially mixed, shaped, dried and punched to obtain the pole piece, wherein the forming process is processed by the above forming method.

[0089] Compared with other pole piece preparation methods, the production efficiency of the preparation method provided by the present invention is obviously improved. During the battery assembly process, the carbon sheet can be automatically clamped and assembled by the equipment, and no fine powder will fall off the separator when the current collector is installed, which reduces the risk of micro-short circuit caused by the fine powder of the pole piece. The pole piece mixture is fully kneaded in the screw extruder to further disperse the active material, high specific surface conductive agent, binder and solvent evenly, and ...

Embodiment 1

[0091] This embodiment provides a method for preparing a positive electrode sheet. The preparation method includes sequential mixing, molding, drying and punching, and specifically includes the following steps:

[0092] (1) Mixing: Acetylene black, polytetrafluoroethylene emulsion (solid content is 50wt%) and isopropanol are added into the mixing device according to the mass ratio of 1:0.1:3 for mixing and stirring, and the stirring of the mixing device The paddle speed is 100r / min, stirring for 10min to obtain the pole piece mixture;

[0093] (2) Forming: the pole piece mixture is added to the feeding bin 3, and is sent into the extrusion device from the feeding bin 3, and the pole piece mixture is further fully mixed through the rotating extrusion of the screw 4, and then pushed out and transported to the extrusion head 1 and Extruded by the extrusion head 1, the extrusion frequency is 30Hz, and the extrusion temperature is 60°C, wherein the extrusion head 1 is as figure 2...

Embodiment 2

[0102] This embodiment provides a method for preparing a positive electrode sheet. The preparation method includes sequential mixing, molding, drying and punching, and specifically includes the following steps:

[0103] (1) Mixing: the positive electrode material, polytetrafluoroethylene emulsion (solid content is 55wt%) and isopropanol are added to the mixing device according to the mass ratio of 1:0.2:4 for mixing and stirring. The positive electrode material includes the mass ratio Be 9:1 acetylene black and Ketjen black, the stirring paddle speed of the mixing device is 200r / min, stir 7min to obtain pole piece mixing;

[0104] (2) Forming: the pole piece mixture is added to the feeding bin 3, and is sent into the extrusion device from the feeding bin 3, and the pole piece mixture is further fully mixed through the rotating extrusion of the screw 4, and then pushed out and transported to the extrusion head 1 and Extruded by the extrusion head 1, the extrusion frequency is 4...

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Abstract

The invention provides an extrusion head for pole piece forming, a forming device comprising the extrusion head, a forming method of the extrusion head and a preparation method of the extrusion head.The extrusion head comprises an extrusion head shell, and a through extrusion channel is formed in the extrusion head shell in the extrusion direction; the extrusion channel is divided into a transition cavity and a forming cavity which are sequentially communicated in a butt joint mode in the extrusion direction, and the diameter of the annular face of the inner wall of the transition cavity is gradually reduced in the extrusion direction. And the mixed pole piece mixture is extruded into a pole piece with a certain thickness by adopting a screw rod, and the pole piece is dried, and then directly passes through a specific cutting die, so the manufacturing of different types of special pole pieces is finished. And compared with other pole piece preparation methods, the preparation efficiency is obviously improved.

Description

technical field [0001] The invention belongs to the technical field of pole piece preparation, and relates to an extrusion head for forming pole pieces, a forming device including the same, a forming method and a preparation method thereof, in particular to an extrusion head for forming special-shaped pole pieces and including the same A molding device, a molding method and a preparation method thereof. Background technique [0002] With the rapid advancement of the construction of the Internet of Things, the concept of smart cities is deeply rooted in the hearts of the people, and the application modes of batteries tend to be diversified. At the same time, more and more designs and products are developed in special-shaped batteries for smart monitoring, smart metering, smart tracking, smart wear and medical devices. The battery shape of special-shaped batteries can be regular or irregular, including coin batteries, square batteries, hexagonal batteries, triangular batterie...

Claims

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Application Information

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IPC IPC(8): H01M4/04
CPCH01M4/0433Y02E60/10
Inventor 邓辉辉曹浪孙佩玲王品高张俊祝媛刘建华刘金成
Owner EVE ENERGY CO LTD
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