Graphite negative electrode material liquid phase coating device

Abstract

The utility model discloses a graphite cathode material liquid phase coating device, which belongs to the technical field of liquid phase coating devices, and comprises an inner cylinder, the top end of the inner cylinder is respectively and fixedly connected with a feeding pipe with a valve and a support frame which are communicated with the inside of the inner cylinder, and the top end of the support frame is fixedly connected with a motor. An output shaft of the motor is connected with a stirring shaft through a coupler, the bottom end of the stirring shaft penetrates through the inner cylinder and extends into the inner cylinder, and the stirring shaft is connected with the penetrating section of the inner cylinder through a bearing; according to the graphite liquid phase coating device, a plurality of groups of separation mechanisms are arranged, a large space in the inner barrel body can be separated into a plurality of independent small spaces for graphite liquid phase coating during graphite liquid phase coating, the problem that the stirring speed is low due to excessive raw material accumulation of an existing device can be solved, and the liquid phase coating efficiency of the device is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to liquid phase coating device technical field, concretely relates to a graphite negative material liquid phase coating device. BACKGROUND

[0002] With the adjustment of national energy structure, the new energy automobile industry has developed unprecedentedly.

[0003] Lithium ion battery has been widely used in new energy vehicle field because of its high specific energy, long cycle life and high working voltage. Although the cost of negative electrode material accounts for a small proportion in all components of lithium ion battery, it is a key factor affecting the cycle life of lithium ion battery.

[0004] Natural graphite has the characteristics of high graphitization degree, high capacity and low cost, and is one of the research and development focuses of lithium ion battery negative electrode material. However, the surface of natural graphite is strongly heterogeneous and has many active sites, which will cause solvent co-embedding when lithium ions are embedded, making it difficult to form a uniform and dense SEI film during the first charge. In addition, the wetting effect with electrolyte is poor, and the graphite layers are easy to fall off during the charging and discharging process, causing short cycle life and other problems.

[0005] In order to effectively avoid the above defects, natural graphite must be modified before it can be used as negative electrode material. Common modification methods include coating method, SEI film modification method and heteroatom doping.

[0006] Chinese patent No. 202022508928.4 discloses a graphite negative material liquid phase coating device, which is composed of a base placed on the ground, a coating box installed on one side of the base, a feeding mechanism installed at the top of the coating box, a partition plate installed inside the coating box, a heatable stirring mechanism installed above the partition plate and communicating with the feeding mechanism, a spiral feeding mechanism installed below the partition plate and communicating with the heatable stirring mechanism, a waste heat utilization mechanism installed on the partition plate to utilize the waste heat generated by the stirring mechanism into the spiral feeding mechanism, and a cooling and discharging mechanism installed on the other side of the base and communicating with the waste heat utilization mechanism. When the device is used for liquid phase coating, the raw materials are put into the heatable stirring mechanism through the feeding mechanism, and the stirring and heating are carried out at the same time to improve the liquid phase coating effect. After liquid phase coating, the materials are sent out by the spiral feeding mechanism. The waste heat utilization mechanism transports the heat generated by the heatable stirring mechanism into the spiral feeding mechanism to realize waste heat utilization. The hot gas after utilization is cooled and discharged by the cooling and discharging mechanism.

[0007] The present inventors have found that the existing graphite negative material liquid phase coating device pours all the raw materials into the stirring mechanism to realize liquid phase coating. During the liquid phase coating process, the raw materials are stacked, resulting in slow stirring speed and slow liquid phase coating efficiency. UTILITY MODEL CONTENTS

[0008] In order to solve the problems raised in the above background technology, the utility model provides a graphite negative electrode material liquid phase coating device, which can solve the problem of slow stirring speed caused by excessive accumulation of raw materials in existing devices and improve the liquid phase coating efficiency of the device.

[0009] In order to achieve the above-mentioned purpose, the present invention provides the following technical solutions: a graphite negative electrode material liquid phase coating device, comprising: an inner cylinder, the top of the inner cylinder is respectively fixed with a feed pipe with a valve and a support frame connected to the interior of the inner cylinder, the top of the support frame is fixed with a motor, the output shaft of the motor is connected to a stirring shaft through a coupling, the bottom end of the stirring shaft passes through the inner cylinder and extends into the inner cylinder, the stirring shaft is connected to the inner cylinder through a bearing, the stirring shaft extends to the inner cylinder inner section and is equipped with multiple groups of equal intervals to cooperate with the inner cylinder to fix the inner part of the inner cylinder A partition mechanism is provided to divide the device into multiple small spaces, and the stirring shaft is equipped with a coating liquid inlet mechanism that can supply coating liquid into the multiple small spaces. A plurality of stirring blades are fixedly sleeved on the stirring shaft at equal intervals between the inner cylinder and the partition mechanism and between two adjacent partition mechanisms. A discharge pipe with a valve is fixedly connected to the middle of the bottom end of the inner cylinder, and four supporting legs are fixedly connected to the outer edge of the bottom end of the inner cylinder at equal intervals along the circumferential direction. A programmable controller is connected to the outside of the inner cylinder, and the feed pipe with a valve, a motor, a partition mechanism and the discharge pipe with a valve are electrically connected to the programmable controller.

[0010] Furthermore, the separation mechanism includes a support seat connected to the stirring shaft through a bearing and four fixed plates fixed to the inner wall of the inner cylinder at equal intervals along the circumferential direction. A hidden cavity is opened inside the support seat, and four closing plates are arranged at equal intervals along the circumferential direction inside the hidden cavity on the outside of the sleeve position. A movable driving mechanism is assembled between the four closing plates and the support seat, and the four fixed plates are respectively located between two adjacent closing plates. The support seat, the four closing plates and the four fixed plates cooperate to form a sealing plate. The stirring blade is fixedly sleeved on the stirring shaft and located between the inner cylinder, the support seat and the two adjacent support seats. The movable driving mechanism is electrically connected to the programmable controller.

[0011] Furthermore, the mobile driving mechanism includes an electromagnet fixedly sleeved in the hidden cavity and located outside the socket position of the support seat, eight movable grooves opened on the top wall and bottom wall of the hidden cavity, and eight movable blocks fixed to the top and bottom ends of the closing plate. A movable rod is fixed inside the movable groove, and the movable block extends into the corresponding movable groove and is movably connected to the corresponding movable rod through an open hole socket. A connecting spring is elastically connected between the movable block and the side wall extending from the movable groove outside the movable rod, and the electromagnet is electrically connected to the programmable controller.

[0012] Furthermore, the coating liquid inlet mechanism includes an inlet pipe with a valve fixedly connected to the stirring shaft and extending to the top of the inner cylinder, and a plurality of outlet pipes fixedly connected to the stirring shaft and extending to the inner section of the inner cylinder and connected to each space after separation. The stirring shaft is a hollow structure, the inlet pipe and the outlet pipe with a valve are connected to the stirring shaft, and the inlet pipe with a valve is electrically connected to the programmable controller.

[0013] Furthermore, the top end of the support seat gradually tilts downward from the middle to the outer edge, and the bottom end of the inner cylinder gradually tilts upward from the middle to the outer edge.

[0014] Furthermore, a support plate which does not affect the rotation of the valve is fixedly connected to the inside of the discharge pipe with a valve above the valve, and the bottom end of the stirring shaft is connected to the support plate through a bearing.

[0015] Furthermore, the outer wall of the inner cylinder is fixedly connected to the outer cylinder, the inner wall of the outer cylinder is fixedly connected to the electric heating coil, the electric heating coil does not contact the inner cylinder, the programmable controller is fixedly connected to the outer wall of the outer cylinder, and the electric heating coil and the programmable controller are electrically connected.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] 1. The utility model is provided with multiple groups of separation mechanisms, which can divide the large space in the inner cylinder into multiple independent small spaces for graphite liquid phase coating during graphite liquid phase coating, which can solve the problem of slow stirring speed caused by excessive accumulation of raw materials in existing devices and improve the liquid phase coating efficiency of the device.

[0018] 2. The utility model is provided with a heating mechanism, which is an electric heating coil, which can heat the inner cylinder evenly and improve the liquid phase coating effect of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a three-dimensional diagram of the utility model;

[0020] Figure 2 This is a vertical cross-sectional view of the utility model;

[0021] Figure 3 For this utility model Figure 2 Enlarged view of point A in the middle;

[0022] In the figure: 1. Inner cylinder; 2. Outer cylinder; 3. Programmable controller; 4. Support frame; 5. Motor; 6. Liquid inlet pipe with valve; 7. Stirring shaft; 8. Liquid outlet pipe; 9. Support leg; 10. Discharge pipe with valve; 11. Support plate; 12. Electric heating coil; 13. Stirring blade; 14. Feed pipe with valve; 15. Movable rod; 16. Fixed plate; 17. Support seat; 18. Electromagnet; 19. Hidden cavity; 20. Movable groove; 21. Movable block; 22. Closing plate; 23. Connecting spring. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0024] Example 1

[0025] See also Figures 1-3 The utility model provides the following technical solutions: a graphite negative electrode material liquid phase coating device, comprising: an inner cylinder 1, the top of the inner cylinder 1 is respectively fixed with a valve feed pipe 14 and a support frame 4 connected to the interior of the inner cylinder 1, the valve model of the valve feed pipe 14 is DN150, the top of the support frame 4 is fixed with a motor 5 with a model of 5IK90RGU-CF, the output shaft of the motor 5 is connected to a stirring shaft 7 through a coupling, the bottom end of the stirring shaft 7 passes through the inner cylinder 1 and extends into the inner cylinder 1, the stirring shaft 7 is connected to the through section of the inner cylinder 1 through a bearing, the stirring shaft 7 extends to the inner section of the inner cylinder 1 and is equipped with multiple groups of equal intervals to cooperate with the inner cylinder 1 to move the inner part of the inner cylinder 1 A partition mechanism is provided to divide the device into multiple small spaces, and a coating liquid inlet mechanism is installed on the stirring shaft 7 for supplying coating liquid into the multiple small spaces. A plurality of stirring blades 13 are fixedly sleeved at equal intervals between the inner cylinder 1 and the partition mechanism and between two adjacent partition mechanisms on the stirring shaft 7. A discharge pipe 10 with a valve is fixedly connected to the middle of the bottom end of the inner cylinder 1, and the valve model of the discharge pipe 10 with a valve is DN150. Four supporting legs 9 are fixedly connected to the outer edge of the bottom end of the inner cylinder 1 at equal intervals along the circumferential direction. A programmable controller 3 with model VH-24MR is connected to the outside of the inner cylinder 1, and the feed pipe 14 with a valve, the motor 5, the partition mechanism and the discharge pipe 10 with a valve are electrically connected to the programmable controller 3.

[0026] See attached Figures 1-2, the device carries out graphite liquid phase coating to produce graphite negative electrode material, the programmable controller 3 controls multiple separation mechanisms to be in unsealed state, at this time, the inner space of the inner cylinder 1 is a large space, the programmable controller 3 controls the valve of the valve feeding pipe 14 to be opened, the graphite is poured into the inner cylinder 1 through the valve feeding pipe 14, and the pouring is stopped until the appropriate amount is added, the valve of the valve feeding pipe 14 is controlled to be closed, and the multiple separation mechanisms are controlled to be reset to start the sealing state, at this time, the inner space of the inner cylinder 1 is multiple small spaces, the coating liquid feeding mechanism is used to add coating liquid into the multiple small spaces until the appropriate amount is added, the programmable controller 3 controls the motor 5 to be started, the motor 5 drives the output shaft to rotate, drives the stirring shaft 7 to rotate, drives the multiple stirring blades 13 to rotate, and the multiple stirring blades 13 stir the graphite and the coating liquid in the multiple small spaces to realize the liquid phase coating of the graphite, after completion, the motor 5 is turned off, the multiple separation mechanisms are unsealed, the valve of the valve discharging pipe 10 is opened through the programmable controller 3, and the graphite in the liquid phase coating state is discharged through the valve discharging pipe 10.

[0027] Specifically, the separation mechanism comprises a support seat 17 connected to the stirring shaft 7 through a bearing and four fixed plates 16 fixed on the inner wall of the inner cylinder 1 at equal intervals in the circumferential direction, a hidden cavity 19 is formed in the support seat 17, four closure plates 22 are arranged at equal intervals in the circumferential direction outside the sleeve connection position in the hidden cavity 19, the closure plates 22 are made of iron, a moving driving mechanism is arranged between the four closure plates 22 and the support seat 17, the four fixed plates 16 are respectively arranged between adjacent two closure plates 22, the support seat 17, the four closure plates 22 and the four fixed plates 16 cooperate to form a sealing plate, the stirring blades 13 are fixedly sleeved on the stirring shaft 7 between the inner cylinder 1 and the support seat 17 and adjacent two support seats 17, and the moving driving mechanism is electrically connected with the programmable controller 3.

[0028] Refer to the accompanying drawings Figures 2-3 The separation mechanism is started by the programmable controller 3 controlling the moving driving mechanism, the moving driving mechanism drives the four closure plates 22 to move towards each other and be accommodated in the hidden cavity 19 to realize the unsealing state, and the moving driving mechanism drives the four closure plates 22 to reset and cooperate with the support seat 17 and the four fixed plates 16 to realize the starting of the sealing state.

[0029] Specifically, the mobile driving mechanism includes an electromagnet 18 with model QDD8030L fixedly sleeved in the hidden cavity 19 and located outside the sleeve position of the support seat 17, eight movable grooves 20 opened on the top and bottom walls of the hidden cavity 19, and eight movable blocks 21 fixed to the top and bottom ends of the closing plate 22. The movable rod 15 is fixed inside the movable groove 20, and the movable block 21 extends into the corresponding movable groove 20 and is movably connected to the corresponding movable rod 15 through the open hole sleeve method. Outside the movable rod 15, a connecting spring 23 is elastically connected between the movable block 21 and the movable groove 20 extending toward the side wall. The electromagnet 18 is electrically connected to the programmable controller 3.

[0030] See attached Figures 2-3 The mobile driving mechanism controls the electromagnet 18 to generate adsorption force through the programmable controller 3, so that the four closing plates 22 move in the direction of approaching each other until the four closing plates 22 are attracted and stopped to realize the mobile driving of the closing plates 22 to release the sealing state; by controlling the electromagnet 18 to cut off the power, the eight connecting springs 23 are reset and the four closing plates 22 are reset in pairs, so that the four closing plates 22 move in the direction of moving away from each other until the four closing plates 22 are reset and stopped to realize the mobile driving of the closing plates 22 to start the sealing state.

[0031] Specifically, the coating liquid inlet mechanism includes a valved liquid inlet pipe 6 fixedly connected to the stirring shaft 7 and extending to the top of the inner cylinder 1, and a plurality of liquid outlet pipes 8 fixedly connected to the stirring shaft 7 and extending to the inner section of the inner cylinder 1 and connected to each space after separation. The valve model of the valved liquid inlet pipe 6 is DN150, the stirring shaft 7 is a hollow structure, the valved liquid inlet pipe 6 and the liquid outlet pipe 8 are connected to the stirring shaft 7, and the valved liquid inlet pipe 6 is electrically connected to the programmable controller 3.

[0032] See attached Figure 2 The coating liquid inlet mechanism is to control the valve of the valve inlet pipe 6 with a valve to open through the programmable controller 3, add the coating liquid into the stirring shaft 7 through the valve inlet pipe 6, and the coating liquid enters each small space through multiple outlet pipes 8 until the appropriate amount is added and stops, and control the valve of the valve inlet pipe 6 with a valve to close to realize the coating liquid inlet.

[0033] Specifically, the top end of the support seat 17 gradually tilts downward from the middle to the outer edge, and the bottom end of the inner cylinder 1 gradually tilts upward from the middle to the outer edge.

[0034] See attached Figures 2-3 , which is convenient for the discharge of graphite after liquid coating.

[0035] Specifically, a support plate 11 that does not affect the rotation of the valve is fixedly connected to the inside of the discharge pipe 10 with a valve and is located above the valve. The bottom end of the stirring shaft 7 is connected to the support plate 11 through a bearing.

[0036] See attached Figure 2Improve the stirring stability of the stirring shaft 7.

[0037] Embodiment two

[0038] The difference between this embodiment and embodiment one is that:

[0039] Specifically, the outer cylinder 2 is fixed to the outer wall of the inner cylinder 1, the electric heating coil 12 is fixed to the inner wall of the outer cylinder 2, the electric heating coil 12 does not contact the inner cylinder 1, the programmable controller 3 is fixed to the outer side wall of the outer cylinder 2, and the electric heating coil 12 is electrically connected with the programmable controller 3.

[0040] Referring to the drawings Figures 1-2 During the graphite liquid phase coating process of the device, the electric heating coil 12 is started by the programmable controller 3, the electric heating coil 12 generates heat to heat the inner cylinder 1, and the effect of the graphite liquid phase coating is improved.

[0041] Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and spirits of the utility model, and the scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. A graphite negative electrode material liquid phase coating device, characterized in that, include: The inner cylinder (1) is fixed with a feed pipe (14) with a valve and a support frame (4) communicating with the inner cylinder (1) at the top end thereof, and a motor (5) is fixed with the top end of the support frame (4). The output shaft of the motor (5) is connected to a stirring shaft (7) through a coupling. The bottom end of the stirring shaft (7) passes through the inner cylinder (1) and extends into the inner cylinder (1). The stirring shaft (7) is connected to the through section of the inner cylinder (1) through a bearing. The stirring shaft (7) extends to the inner section of the inner cylinder (1) and is equipped with multiple groups of partition mechanisms that cooperate with the inner cylinder (1) to divide the inner cylinder (1) into multiple small spaces at equal intervals. The mixing shaft (7) is equipped with a coating liquid inlet mechanism capable of supplying coating liquid into a plurality of small spaces. A plurality of stirring blades (13) are fixedly sleeved at equal intervals between the inner cylinder (1) and the partition mechanism and between two adjacent partition mechanisms on the mixing shaft (7). A discharge pipe (10) with a valve is fixedly connected to the middle of the bottom end of the inner cylinder (1). Four supporting legs (9) are fixedly connected to the outer edge of the bottom end of the inner cylinder (1) at equal intervals along the circumferential direction. A programmable controller (3) is connected to the outside of the inner cylinder (1). The feed pipe (14) with a valve, the motor (5), the partition mechanism and the discharge pipe (10) with a valve are electrically connected to the programmable controller (3).

2. The graphite negative electrode material liquid phase coating device according to claim 1, characterized in that: The separation mechanism comprises a support seat (17) connected to the stirring shaft (7) through a bearing and four fixed plates (16) fixed to the inner wall of the inner cylinder (1) at equal intervals along the circumferential direction. A hidden cavity (19) is provided inside the support seat (17). Four closing plates (22) are provided inside the hidden cavity (19) at equal intervals along the circumferential direction on the outside of the sleeve position. A movable driving mechanism is assembled between the four closing plates (22) and the support seat (17). The four fixed plates (16) are respectively located between two adjacent closing plates (22). The support seat (17), the four closing plates (22) and the four fixed plates (16) cooperate to form a sealing plate. The stirring blade (13) is fixedly sleeved on the stirring shaft (7) and located between the inner cylinder (1), the support seat (17) and the two adjacent support seats (17). The movable driving mechanism is electrically connected to the programmable controller (3).

3. The graphite negative electrode material liquid phase coating device according to claim 2, characterized in that: The mobile driving mechanism comprises an electromagnet (18) fixedly sleeved in a hidden cavity (19) and located outside a sleeve position of a support seat (17), eight movable grooves (20) provided on the top and bottom walls of the hidden cavity (19), and eight movable blocks (21) fixedly connected to the top and bottom ends of a closing plate (22); a movable rod (15) is fixedly connected inside the movable groove (20); the movable blocks (21) extend into the corresponding movable groove (20) and are movably connected to the corresponding movable rod (15) through an open hole sleeve mode; a connecting spring (23) is elastically connected between the movable block (21) and the movable groove (20) extending toward the side wall outside the movable rod (15); and the electromagnet (18) is electrically connected to the programmable controller (3).

4. The graphite negative electrode material liquid phase coating device according to claim 1, characterized in that: The coating liquid inlet mechanism comprises a liquid inlet pipe (6) with a valve fixedly connected to the stirring shaft (7) and extending to the upper part of the inner cylinder (1), and a plurality of liquid outlet pipes (8) fixedly connected to the stirring shaft (7) and extending to the inner section of the inner cylinder (1) and communicating with each space after separation. The stirring shaft (7) is a hollow structure, the liquid inlet pipe (6) with a valve and the liquid outlet pipe (8) are communicated with the stirring shaft (7), and the liquid inlet pipe (6) with a valve is electrically connected to the programmable controller (3).

5. The graphite negative electrode material liquid phase coating device according to claim 2, characterized in that: The top end of the support seat (17) gradually tilts downward from the middle to the outer edge, and the bottom end of the inner cylinder (1) gradually tilts upward from the middle to the outer edge.

6. The graphite negative electrode material liquid phase coating device according to claim 1, characterized in that: A support plate (11) which does not affect the rotation of the valve is fixedly connected to the inside of the discharge pipe (10) with the valve and is located above the valve. The bottom end of the stirring shaft (7) is connected to the support plate (11) through a bearing.

7. The graphite negative electrode material liquid phase coating device according to claim 1, characterized in that: The outer wall of the inner cylinder (1) is fixedly connected to the outer cylinder (2), the inner wall of the outer cylinder (2) is fixedly connected to the electric heating coil (12), the electric heating coil (12) does not contact the inner cylinder (1), the programmable controller (3) is fixedly connected to the outer wall of the outer cylinder (2), and the electric heating coil (12) and the programmable controller (3) are electrically connected.

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