Helical ribbon mixer for lithium iron phosphate production

Abstract

The utility model provides a helical ribbon mixer for lithium iron phosphate production, and relates to the technical field of lithium iron phosphate production devices, the helical ribbon mixer comprises a base, a mixing tank, a mixing liner, a motor and a helical ribbon stirrer, the bottom of the mixing tank is provided with a discharge port, the mixing liner is integrally formed by a polyurethane material, the mixing liner is mounted in the mixing tank in an attached manner, and the motor is connected with the helical ribbon stirrer. The two ends of a rotating shaft of the helical ribbon stirrer penetrate through the material mixing inner container and mounting holes in the two sides of the mixing tank respectively to be connected with the bearings, the motor is mounted on one side of the mixing tank, the power output end of the motor is connected with the power input end of the helical ribbon stirrer, and polyurethane coating layers are arranged on the rotating shaft of the helical ribbon stirrer, helical ribbon blades and connecting rods. The spiral ribbon mixer can solve the problem that a traditional spiral ribbon mixer adheres to the wall, and the problem that the cycle life and safety of a battery are affected by metal chippings generated along with abrasion.

Description

TECHNICAL FIELD

[0001] The utility model relates to lithium iron phosphate production device technical field, specifically related to a lithium iron phosphate production is with spiral ribbon mixer. BACKGROUND

[0002] Lithium iron phosphate is a lithium ion battery electrode material, chemical formula is LiFePO4 (abbreviation LFP), is mainly used for various lithium ion batteries, main production process includes mixing, spray drying, sintering, crushing, mixing, baking, packaging, and the material needs to form a low power efficient mixing environment in the spiral ribbon mixer after crushing, and the mixture is uniformly mixed in a short time, and the mixing speed is accelerated, and the mixing uniformity is improved.

[0003] The stirring shaft, the multiple belt blades and other main components of the traditional spiral ribbon mixer are metal materials, and metal chips are generated during the stirring process due to abrasion, since the metal has conductivity, a small amount of metal particles may form a local conductive path in the electrode, thereby causing uneven current distribution, even forming a micro short circuit phenomenon, affecting the battery cycle life and safety, and the stirring tank of the traditional spiral ribbon mixer also has a wall sticking problem, so that the lithium iron phosphate mixing uniformity is reduced, and the finished product quality is reduced. Therefore, the present application provides a spiral ribbon mixer for lithium iron phosphate production. UTILITY MODEL CONTENTS

[0004] In order to overcome the problems in the background art, the utility model provides a spiral ribbon mixer for lithium iron phosphate production, which solves the wall sticking problem of the traditional spiral ribbon mixer and the problem of metal chips affecting the battery cycle life and safety due to abrasion.

[0005] To achieve the above purpose, the utility model is realized by the following technical schemes:

[0006] A spiral ribbon mixer for lithium iron phosphate production, comprising a base, a mixing tank, a mixing liner, a motor and a spiral ribbon stirrer, the mixing tank is installed on the base, the bottom of the mixing tank is provided with a discharge port, the mixing liner is an integrally formed mixing liner made of polyurethane material, the mixing liner is installed in the mixing tank, the bottom of the mixing liner is provided with a discharge port corresponding to the discharge port, the spiral ribbon stirrer is coaxially installed with the mixing tank, the shaft of the spiral ribbon stirrer is connected with the bearing through the mounting holes on both sides of the mixing liner and the mixing tank, the motor is installed on one side of the mixing tank, the power output end of the motor is connected with the power input end of the spiral ribbon stirrer, and the shaft, the spiral ribbon blade and the connecting rod of the spiral ribbon stirrer are all provided with a polyurethane coating layer.

[0007] Further, the screw belt blade comprises large blades and small blades, a plurality of groups of the large blades and the small blades are coaxially installed on the rotating shaft through connecting long rods and connecting short rods respectively, the small blades are arranged in the large blades, the helixes of the small blades and the large blades in the same group are opposite, the helixes of the small blades in adjacent groups are opposite, and the helixes of the large blades in adjacent groups are opposite.

[0008] Further, the end of the connecting long rod is provided with a scraper plate integrally formed by polyurethane material and matched with the inner wall of the mixing inner container.

[0009] The application has the following beneficial effects:

[0010] The application further improves the traditional screw belt mixer, designs a mixing inner container integrally formed by polyurethane material in the mixing tank, and designs a screw belt type stirrer with a polyurethane coating layer, solves the problem that the traditional screw belt mixer produces metal debris with abrasion, and influences the cycle life and safety of the battery, the mixing inner container made of polyurethane material has certain self-lubricating property, and cooperates with the scraper plate designed on the screw belt type stirrer, and solves the problem that the mixing tank of the traditional screw belt mixer still has the problem of wall sticking. BRIEF DESCRIPTION OF DRAWINGS

[0011] In order to clearly illustrate the technical scheme in the embodiments of the application, the drawings used in the embodiment description are described.

[0012] Figure 1 It is a schematic diagram of the overall structure of the application;

[0013] Figure 2 It is a schematic diagram of the cross-sectional structure of the mixing tank of the application;

[0014] Figure 3 It is a schematic diagram of the internal structure of the mixing tank of the application;

[0015] Figure 4 It is a schematic diagram of the structure of the screw belt type stirrer of the application;

[0016] Figure 5 It is a schematic diagram of the side view structure of the screw belt type stirrer of the application.

[0017] 1-base, 2-mixing tank, 21-discharge port, 3-mixing inner container, 31-discharge port, 4-motor, 5-screw belt type stirrer, 51-rotating shaft, 52-screw belt blade, 521-large blade, 522-small blade, 53-connecting rod, 531-connecting long rod, 532-connecting short rod, 54-polyurethane coating layer, 6-scraper plate. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical scheme and beneficial effect of the utility model clearer, the preferred embodiments of the utility model will be described in detail below with reference to the drawings, so as to facilitate the understanding of the technical personnel.

[0019] The utility model discloses a spiral ribbon mixer for lithium iron phosphate production, refer to Figures 1-5 A spiral ribbon mixer for lithium iron phosphate production, including base 1, mixing tank 2, mixing inner bag 3, motor 4 and spiral ribbon mixer 5, mixing tank 2 is installed on base 1, and the bottom of mixing tank 2 is provided with the discharge port 21, and the mixed lithium iron phosphate can be discharged from the discharge port 21, and the mixing inner bag 3 is integrally formed with the mixing inner bag 3 of polyurethane material, and the mixing inner bag 3 is attachedly installed in the mixing tank 2, and the bottom of the mixing inner bag 3 is provided with the discharge port 31 corresponding to the discharge port 21, and the spiral ribbon mixer 5 is coaxially installed with the mixing tank 2, and the lithium iron phosphate in the mixing tank 2 is uniformly stirred, and the rotating shaft 51 of the spiral ribbon mixer 5 is connected with the bearing by penetrating the mounting holes on both sides of the mixing inner bag 3 and the mixing tank 2 respectively, and the motor 4 is installed on one side of the mixing tank 2, and the power output end of the motor 4 is connected with the power input end of the spiral ribbon mixer 5, which can drive the spiral ribbon mixer 5 to rotate, and the rotating shaft 51, the spiral ribbon blade 52 and the connecting rod 53 of the spiral ribbon mixer 5 are all provided with the polyurethane coating layer 54, and the polyurethane is a kind of high molecular material, which will not produce metal particles in the process of friction or impact like metal, so it can be used as stirring component, and the generation of metal debris can be eliminated from the source, and the polyurethane material with appropriate ratio has good wear resistance, which can reduce other types of debris caused by abrasion to a certain extent, such as polyurethane powder.

[0020] Refer to Figures 1-5 The spiral ribbon blade 52 includes large blade 521 and small blade 522, and the large blade 521 and the small blade 522 are coaxially installed in multiple groups on the rotating shaft 51 through the connecting long rod 531 and the connecting short rod 532 respectively, the small blade 522 is arranged in the large blade 521, the helix of the small blade 522 and the large blade 521 in the same group is opposite, so that the material can obtain sufficient shearing effect when moving in the mixing cavity, and can avoid excessive energy loss, which helps to improve the residence time and mutual collision opportunity of the material in the mixing area, thereby promoting uniform mixing, the helix of the small blade 522 in adjacent groups is opposite, the helix of the large blade 521 in adjacent groups is opposite, which can increase the shearing and tearing effect between materials, and at the same time reduce the formation of local blockage and dead zone, to ensure that the material in the mixing cavity flows more uniformly.

[0021] Refer to Figures 1-5 The end of the connecting long rod 531 is provided with the scraper 6 integrally formed with the inner wall of the mixing inner bag 3 by polyurethane material, to avoid powder sticking and hardening, and ensure uniform mixing.

[0022] Working process:

[0023] The discharge port 21 is closed, the motor 4 is started, and the crushed lithium iron phosphate is sent into the mixing inner container 3. The large blade 521 and the small blade 522 on the screw belt stirrer 5 form a low-power high-efficiency mixing environment in the mixing inner container 3. The mixed material is uniformly mixed in a short time. By accelerating the mixing speed and improving the mixing uniformity, the scraper 6 scrapes the wall material during the mixing process, so that the mixing is more uniform. After the mixing is completed, the lithium iron phosphate is discharged through the discharge port 21 and sent to the next process.

[0024] The above is only a preferred specific embodiment of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can make equivalent replacement or change according to the technical scheme and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A ribbon blender for lithium iron phosphate production, characterized by: The utility model relates to a mixing device, including base (1), mixing tank (2), mixing liner (3), motor (4) and screw belt type stirrer (5), mixing tank (2) is installed on base (1), mixing tank (2) bottom is provided with discharge port (21), mixing liner (3) is the mixing liner (3) of polyurethane material integrated molding, mixing liner (3) is installed in mixing tank (2) in place, mixing liner (3) bottom is provided with the discharge port (31) corresponding with discharge port (21), screw belt type stirrer (5) is coaxial with mixing tank (2) installation, and the both ends of the rotating shaft (51) of screw belt type stirrer (5) respectively pass through the mounting hole of mixing liner (3) and mixing tank (2) both sides and are connected with bearing, motor (4) is installed on one side of mixing tank (2), and the power output end of motor (4) is connected with the power input end of screw belt type stirrer (5), and the rotating shaft (51) of screw belt type stirrer (5), screw belt blade (52) and connecting rod (53) all are equipped with polyurethane coating (54).

2. The ribbon blender for producing lithium iron phosphate according to claim 1, wherein: The screw belt blade (52) includes large blade (521) and small blade (522), and the large blade (521) and the small blade (522) are coaxially installed in multiple groups on the rotating shaft (51) through the connecting long rod (531) and the connecting short rod (532), respectively, the small blade (522) is arranged in the large blade (521), the helixes of the small blade (522) and the large blade (521) in the same group are opposite, the helixes of the small blade (522) in adjacent groups are opposite, and the helixes of the large blade (521) in adjacent groups are opposite.

3. The ribbon blender for producing lithium iron phosphate according to claim 2, wherein: The connecting long rod (531) end is provided with the scraper (6) by the polyurethane material integrated molding that is in place with the mixing liner (3) inner wall.

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