Spray head structure of a lithium-ion battery coater

Abstract

The present invention relates to a nozzle structure of a lithium-ion battery coater, which includes upper and lower lip plates and a backing plate. A closed semi-elliptical inner cavity is longitudinally provided along the inner edge of the lower lip plate. The lower lip plate is provided with a feed port communicating with the semi-elliptical inner cavity. The upper lip plate is provided with exhaust holes. The backing plate is placed between the upper and lower lip plates and is fixedly connected by bolts after being buckled. A strip-shaped backing plate is provided with a discharge opening along its transverse direction. The feature is that: filling blocks are closely attached to the left and right sides of the semi-elliptical inner cavity in the lower lip plate, forming a nozzle lower lip plate structure in which the width of the slurry-containing space in the lower lip plate cavity is equal to the width of the discharge opening of the backing plate. Beneficial effects: By adding filling blocks in the present invention, the width of the cavity can be made equal to the width of the extruded slurry. The width of the cavity is reduced by the filling blocks, the ineffective volume in the cavity is reduced, the viscosity of the slurry in the nozzle is significantly inhibited, the fluidity of the slurry is enhanced, and the deposition rate of the slurry inside the nozzle is slowed down.

Description

Technical Field

[0001] The present invention belongs to the technical field of lithium-ion batteries, and particularly relates to a nozzle structure of a coating machine for lithium-ion batteries. Background Art

[0002] At present, lithium-ion batteries are widely used in large and medium-sized electric devices such as electric vehicles, electric bicycles, and electric tools. Therefore, the safety requirements for lithium-ion batteries are getting higher and higher. In the production process of lithium-ion batteries, the coating process has become the most important step in determining the safety of the battery electrode sheet in the production link of the electrode sheet. In order to improve efficiency, it is necessary to ensure a stable and high-quality coating effect.

[0003] Due to the water-absorbing characteristics of high-nickel ternary and high-voltage cobalt-lithium materials, the viscosity of the slurry in the nozzle of the lithium-ion battery coating machine exceeds 2500 cp, resulting in poor fluidity of the slurry. The structure of the nozzle of the lithium-ion battery coating machine includes upper and lower lip plates and a backing plate. The backing plate is provided with a discharge opening along its transverse direction. The working principle of the coating machine nozzle is that the slurry is extruded through the gap of the discharge opening of the backing plate between the upper and lower lip plates of the nozzle. The inner parts of the upper and lower lip plates are respectively semi-elliptical cavities. The slurry is provided with pressure by a pump and enters the nozzle feed port and is stored in the nozzle cavity. At present, the total width of the inner cavity of the nozzle is 682 mm, and the required coating length of the product in the process is 550 mm (i.e., the width of the discharge opening of the backing plate is 550 mm). Since the total width of the inner cavity of the nozzle is greater than the width of the discharge opening of the backing plate, (682 mm - 550 mm) / 2 = 66 mm, it causes the slurry to stay in the spaces at the left and right ends of the nozzle cavity (66 mm each), resulting in slow slurry circulation and poor fluidity. This causes sedimentation and agglomeration of the slurry in the nozzle, and flocs appear on the surface of the coated product. The nozzle must be cleaned once a day during operation, which directly affects the smooth progress of the coating production process, reduces the overall production capacity of the battery, and increases the overall production cost of the battery. Summary of the Invention

[0004] The purpose of the present invention is to overcome the above-mentioned deficiencies in the technology and provide a nozzle structure of a coating machine for lithium-ion batteries. By adding filling blocks, the width of the cavity can be made equal to the width of the extruded slurry, avoiding the excess space at the left and right ends of the nozzle cavity for the slurry to stay, and achieving the purpose of preventing slurry sedimentation on both sides of the nozzle and reducing flocs on the product surface.

[0005] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a nozzle structure of a lithium-ion battery coating machine, comprising an upper lip plate, a lower lip plate and a pad plate, wherein a closed semi-elliptical inner cavity is provided in the lower lip plate along its longitudinal direction, the lower lip plate is provided with a feed port connected to the semi-elliptical inner cavity, the upper lip plate is provided with an exhaust hole, the pad plate is placed between the upper and lower lip plates and fastened by bolts, and a strip pad plate is provided with a discharge opening along its transverse direction, and is characterized in that: tightly fitting filling blocks are placed on the left and right sides of the semi-elliptical inner cavity in the lower lip plate, forming a nozzle lower lip plate structure in which the width of the slurry space of the lower lip plate cavity is equal to the width of the pad plate discharge opening.

[0006] Furthermore, the filling block is made of polytetrafluoroethylene material by injection molding.

[0007] Furthermore, the filling block has a U-shaped cross-section, and its outer edge fits tightly with the semi-elliptical inner cavity of the lower lip plate. The inner cavity is provided with an exhaust groove along its longitudinal direction. The exhaust groove has a "凵"-shaped cross-section, and the exhaust groove is connected to the exhaust hole of the upper lip plate.

[0008] Furthermore, the filling blocks are arranged as a right filling block and a left filling block, and an upper edge of one side wall of the filling block is provided with a sharp edge which fits tightly with the inner cavity of the lower lip plate, and the sharp edge is symmetrically arranged on the right filling block and the left filling block.

[0009] Furthermore, a fixing screw hole is provided at the center of the filling block, which is fixed to the lower lip plate by bolts.

[0010] Furthermore, the end of the filling block is provided with an arc chamfer which is in contact with the closed side of the semi-elliptical inner cavity of the lower lip plate, and the bottom of the filling block is provided with a bottom arc which is in contact with the bottom of the inner cavity of the lower lip plate.

[0011] Beneficial effects: Compared with the prior art, the present invention adds a filling block to make the width of the cavity equal to the width of the extruded slurry. The filling block reduces the width of the cavity and the ineffective volume in the cavity, so that the viscosity of the slurry in the nozzle is significantly suppressed, the fluidity of the slurry is enhanced, and the deposition rate of the slurry inside the nozzle is slowed down. The slurry on both sides of the nozzle is prevented from settling, and the flocs on the surface of the product are reduced. After use, the nozzle cleaning is optimized from once a day to once every five days, achieving the consistency of the cavity and the required extruded slurry width, achieving the purpose of preventing slurry agglomeration and sedimentation, and ensuring product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the structure of the present invention;

[0013] Figure 2 yes Figure 1 Schematic diagram of the three-dimensional structure of the filling block on the middle left;

[0014] Figure 3 yesFigure 2 Right view;

[0015] Figure 4 is Figure 1 Schematic three-dimensional structure diagram of the right filling block in

[0016] Figure 5 Schematic structure diagram of the strip-shaped backing plate;

[0017] Figure 6 Dimension reference diagram of the front view of the filling block in this embodiment;

[0018] Figure 7 Dimension reference diagram of the left view of the filling block in this embodiment;

[0019] Figure 8 Dimension reference diagram of the top view of the filling block in this embodiment.

[0020] In the figure: 1. Upper lip plate, 2. Lower lip plate, 3. Backing plate, 3-1. Discharge opening, 4. Filling block, 4-1. Exhaust long slot, 4-2. Sharp edge, 4-3. Fixed screw hole, 4-4. Arc chamfer, 4-5. Bottom arc. Detailed implementation manners

[0021] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific implementation manners. It should be noted that, without conflict, the implementation manners and the features in the implementation manners of the present application can be combined with each other. In the following description, many specific details are set forth in order to fully understand the present invention. The described implementation manners are only a part of the implementation manners of the present invention, rather than all of the implementation manners. Based on the implementation manners in the present invention, all other implementation manners obtained by those of ordinary skill in the art without making creative efforts fall within the scope of protection of the present invention. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present invention belongs. The terms used in the description of the present invention in this specification are only for the purpose of describing specific implementation manners, and are not intended to limit the present invention.

[0022] In each embodiment of the present invention, for the purpose of easy description rather than limiting the present invention, the term "connection" used in the specification and claims of the present invention for patent application is not limited to physical or mechanical connection, but may include electrical connection, whether direct or indirect. "Upper", "lower", "below", "left", "right", etc. are only used to represent relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship also changes accordingly.

[0023] The following details the specific implementation manners of the present invention with reference to preferred embodiments.

[0024] See attached for details Figure 1 The present embodiment provides a nozzle structure of a lithium-ion battery coating machine, including upper and lower lip plates 1, 2 and a pad 3, wherein the lower lip plate is provided with a closed semi-elliptical inner cavity along its longitudinal direction, the lower lip plate is provided with a feed port (not shown in the figure) connected to the semi-elliptical inner cavity, the upper lip plate is provided with an exhaust hole (not shown in the figure), the pad is placed between the upper and lower lip plates and fastened by bolts, the strip pad is provided with a discharge opening 3-1 along its transverse direction, and the left and right sides of the semi-elliptical inner cavity in the lower lip plate are provided with tightly fitting filling blocks 4, forming a nozzle lower lip plate structure in which the width of the slurry space of the lower lip plate cavity is equal to the width of the pad plate discharge opening. The filling block is made of polytetrafluoroethylene material by injection molding.

[0025] The preferred solution of this embodiment is that the cross-sectional shape of the filling block is "U"-shaped, and the shape of its outer edge is tightly fitted with the semi-elliptical inner cavity of the lower lip plate, and the inner cavity is provided with an exhaust groove 4-1 along its longitudinal direction, and the cross-sectional shape of the exhaust groove is "凵"-shaped, and the exhaust groove is connected to the exhaust hole of the upper lip plate.

[0026] The preferred solution of this embodiment is that the filling blocks are arranged as right filling blocks and left filling blocks, and the upper edge of one side wall of the filling block is provided with a sharp edge 4-2 which fits tightly with the inner cavity of the lower lip plate, and the sharp edge is symmetrically arranged on the right filling block and the left filling block.

[0027] The preferred solution of this embodiment is that a fixing screw hole 4-3 is provided at the center of the filling block, and the filling block is fixedly connected to the lower lip plate by bolts. The fixing bolts of this embodiment are made of polytetrafluoroethylene or stainless steel.

[0028] The preferred solution of this embodiment is that the end of the filling block is provided with an arc chamfer 4-4 which kisses the closed side of the semi-elliptical inner cavity of the lower lip plate, and the bottom of the filling block is provided with a bottom arc 4-5 which kisses the bottom of the inner cavity of the lower lip plate.

[0029] See attached for details Figures 5 - 7 The dimensions of the filling block in this embodiment are as follows: the length of the filling block is 66 mm, the height is 31.50 mm. -0.10-0.20 mm, width is 42.07mm, the exhaust slot depth is 15mm, width is 17mm, the arc at the bottom of the filling block is R19.50mm, the arc chamfer at the end of the filling block is R6mm, the center fixing screw hole of the filling block is M6mm, the sharp edge arc on the upper edge of the wall on one side of the filling block is R2mm, and the width is 1.11mm.

[0030] How it works

[0031] After being used in experiments and verified to be effective, the structure is used as an important installation component on the nozzle of the coater. Through the design of the filling blocks on both sides of the nozzle, the filling blocks are closely combined with the upper and lower lips of the nozzle, and the arc-shaped design of the edge of the filling block more effectively prevents the agglomeration and sedimentation of the slurry on both sides of the nozzle. The overall production capacity of the battery is improved, and the overall production cost of the battery is reduced.

[0032] The advantages of this invention patent are as follows: filling blocks are added on both sides of the nozzle, the edges of the filling blocks are designed as arc structures, and grooves are designed in the middle to facilitate the exhaust of the nozzle, achieving the purpose of preventing the agglomeration and sedimentation of the slurry on both sides of the nozzle.

[0033] 1. After using the invention, the viscosity test of the slurry in the nozzle can reach the effect of <2500 cp;

[0034] 2. The time when precipitates appear on the product is extended from 24 hours to 72 hours;

[0035] 3. The cleaning frequency of the nozzle is extended from 1-2 times a day to once every 5-7 days;

[0036] The viscosity of the slurry is significantly inhibited, the fluidity of the slurry is enhanced, and the deposition rate of the slurry inside the nozzle is slowed down.

[0037] The above detailed description of the nozzle structure of a lithium-ion battery coater with reference to the embodiments is illustrative rather than restrictive. Several embodiments can be listed within the defined scope. Therefore, changes and modifications without departing from the overall concept of the present invention should fall within the protection scope of the present invention.

Claims

1. The nozzle structure of a lithium-ion battery coater, comprising upper and lower lip plates and a backing plate. A closed semi-elliptical inner cavity is longitudinally provided along the inner edge of the lower lip plate. The lower lip plate is provided with a feed port communicating with the semi-elliptical inner cavity. The upper lip plate is provided with an exhaust hole. The backing plate is placed between the upper and lower lip plates and is fixedly connected by bolts after being buckled. The strip-shaped backing plate is provided with a discharge opening along its transverse direction. It is characterized in that: Tightly fitting filling blocks are arranged on the left and right sides of the semi-elliptical inner cavity of the lower lip plate, forming a nozzle lower lip plate structure in which the width of the slurry capacity space of the lower lip plate cavity is equal to the width of the pad plate discharge opening; the cross-sectional shape of the filling block is U-shaped, and the shape of its outer edge is tightly fitted with the semi-elliptical inner cavity of the lower lip plate, and its inner cavity is provided with an exhaust groove along its longitudinal direction, and the cross-sectional shape of the exhaust groove is "凵"-shaped, and the exhaust groove is connected with the exhaust hole of the upper lip plate; the end of the filling block is provided with an arc chamfer that matches the closed side of the semi-elliptical inner cavity of the lower lip plate, and the bottom of the filling block is provided with a bottom arc that matches the bottom of the lower lip plate inner cavity.

2. The nozzle structure of the lithium-ion battery coater according to claim 1, characterized in that: The filling block is made of polytetrafluoroethylene material by injection molding.

3. The nozzle structure of the lithium-ion battery coater according to claim 1 or 2, characterized in that: The filling blocks are arranged as a right filling block and a left filling block, and the upper edge of one side wall of the filling block is provided with a sharp edge which is closely fitted with the inner cavity of the lower lip plate, and the sharp edge is symmetrically arranged on the right filling block and the left filling block.

4. The nozzle structure of the lithium-ion battery coater according to claim 3, characterized in that: A fixing screw hole is arranged at the center of the filling block, and is fixedly connected to the lower lip plate by bolts.

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