Coating thickness control mechanism for lithium ion battery production

Abstract

The utility model relates to the technical field of lithium ion battery production, in particular to a coating thickness control mechanism for lithium ion battery production, which comprises a coating thickness control mechanism main body and a base material conveying roll shaft, a gap extrusion coating movable die head is installed on the gap extrusion coating fixed die head in a hinged mode, an opening gap of the gap extrusion coating fixed die head and an opening gap of the gap extrusion coating movable die head face the base material conveying roller shaft, and side installation frames are arranged at the two ends of the base material conveying roller shaft; a coating thickness laser detection mechanism is mounted above the base material conveying roller shaft, and linear driving mechanisms are symmetrically mounted at the bottom of the gap extrusion coating fixed die head. The coating thickness control mechanism for lithium ion battery production can be conveniently maintained, the electromagnetic switch controller used for coating control is installed on the side face of the gap extrusion coating fixed die head, and when the gap extrusion coating fixed die head is maintained, power failure can be kept.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium - ion battery production, and particularly relates to a coating thickness control mechanism for lithium - ion battery production. Background Technique

[0002] In the production of lithium - ion batteries, a coater is used to evenly coat the electrode paste on a current collector (such as copper foil or aluminum foil). The performance of lithium - ion batteries depends to a large extent on the uniformity and consistency of their internal structure, especially the coating thickness of the positive and negative electrode materials. If the coating thickness is too thin or too thick, it will affect the subsequent pole - piece rolling process and cannot ensure the performance consistency of the battery pole pieces. During the manufacturing process, precise control of the coating thickness is crucial for ensuring the energy density, cycle life, and safety of the battery.

[0003] Existing coaters for lithium - ion battery production perform coating treatments through coating methods such as blade coating, roll - coating transfer coating, and slot - die extrusion coating. Among them, slot - die extrusion coating can provide extremely high thickness control accuracy. Slot - die extrusion coating makes the paste extrude and spray out through the gap of the coating die under a certain pressure and transfer to the substrate. However, slot - die extrusion coating often requires cleaning and maintenance to avoid gap blockage. But the distance between the slot - die extrusion coating and the roller shaft for substrate transmission is usually not adjustable. Even if the slot - die extrusion coating can be opened and closed conveniently, it will still cause the problem of insufficient operating space, affecting the safety of cleaning and maintenance. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a coating thickness control mechanism for lithium - ion battery production, so as to solve the problem proposed in the above background technique that in the current market, slot - die extrusion coating often requires cleaning and maintenance to avoid gap blockage, but the distance between the slot - die extrusion coating and the roller shaft for substrate transmission is usually not adjustable. Even if the slot - die extrusion coating can be opened and closed conveniently, it will still cause the problem of insufficient operating space, affecting the safety of cleaning and maintenance.

[0005] To achieve the above object, the utility model provides the following technical solution: A coating thickness control mechanism for lithium-ion battery production, including a coating thickness control mechanism main body and a substrate conveying roller shaft. A slit extrusion coating fixed die head is provided on the coating thickness control mechanism main body, and a slit extrusion coating movable die head is hinged and installed on the slit extrusion coating fixed die head. The opening slits of the slit extrusion coating fixed die head and the slit extrusion coating movable die head face the substrate conveying roller shaft. Side mounting frames are provided at both ends of the substrate conveying roller shaft, and a coating thickness laser detection mechanism is installed above the substrate conveying roller shaft. Linear driving mechanisms are symmetrically installed at the bottom of the slit extrusion coating fixed die head, and a connecting member is connected to the bottom of the slit extrusion coating fixed die head. The lower end of the connecting member is connected to a movable limit seat and a movable driving seat, and an electromagnetic switch controller is installed on the surface of the movable limit seat facing the side mounting frame. A limit rod and a transmission lead screw are installed in the linear driving mechanism, the movable limit seat movably penetrates through the limit rod, and the movable driving seat threadedly penetrates through the transmission lead screw.

[0006] Preferably, a slurry groove is formed inside the slit extrusion coating movable die head, and an exhaust hole communicating with the slurry groove is further formed at the upper end of the slit extrusion coating movable die head.

[0007] Preferably, a first manifold and a second manifold with an arc-shaped structure are formed inside the slit extrusion coating fixed die head, and the first manifold, the second manifold and the slurry groove are communicated with each other.

[0008] Preferably, the connecting member is of an L-shaped structure, and the connecting member is fixedly welded to both the movable limit seat and the movable driving seat, and the connecting member is fixedly screwed to the bottom of the slit extrusion coating fixed die head.

[0009] Preferably, a groove is formed on the surface of the linear driving mechanism close to the side mounting frame, and the position of the groove of the linear driving mechanism corresponds to the position of the electromagnetic switch controller.

[0010] Preferably, the limit rod and the transmission lead screw are on the same straight line, and the linear driving mechanism is screwed and installed on the side mounting frame.

[0011] Compared with the prior art, the beneficial effect of the utility model is that the coating thickness control mechanism for lithium-ion battery production can be conveniently maintained, and the electromagnetic switch controller for coating control is installed on the side of the slit extrusion coating fixed die head. When the slit extrusion coating fixed die head is maintained, power can be cut off. The coating thickness control mechanism for lithium-ion battery production movably installs the slit extrusion coating fixed die head, provides a sufficient safety distance between the coating die head and the substrate conveying roller shaft, enables the coating die head to be efficiently cleaned and maintained, and uses the electromagnetic principle to control the on-off of the circuit, providing a safety power-off function for the maintenance of the coating die head. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 Structural schematic diagram of a coating thickness control mechanism for lithium-ion battery production according to the present utility model;

[0013] Figure 2 Structural schematic diagram of the moving structure of the gap extrusion coating fixed die head of a coating thickness control mechanism for lithium-ion battery production according to the present utility model;

[0014] Figure 3 Structural schematic diagram of the connection between the gap extrusion coating fixed die head and the linear drive mechanism through a connecting member of a coating thickness control mechanism for lithium-ion battery production according to the present utility model;

[0015] Figure 4 Structural schematic diagram of the installation position of the electromagnetic switch controller of a coating thickness control mechanism for lithium-ion battery production according to the present utility model;

[0016] Figure 5 Top view of the connection between the connecting member and the linear drive mechanism of a coating thickness control mechanism for lithium-ion battery production according to the present utility model.

[0017] In the figure: 1. Main body of the coating thickness control mechanism; 2. Gap extrusion coating fixed die head; 201. First manifold; 202. Second manifold; 3. Connecting member; 301. Movable limit seat; 302. Movable drive seat; 4. Gap extrusion coating movable die head; 401. Exhaust hole; 402. Slurry tank; 5. Coating thickness laser detection mechanism; 6. Substrate conveying roller shaft; 7. Linear drive mechanism; 701. Limit rod; 702. Transmission lead screw; 8. Side mounting frame; 9. Electromagnetic switch controller. Specific implementation manners

[0018] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0019] Please refer to Figures 1-5, the present utility model provides a technical solution: a coating thickness control mechanism for lithium-ion battery production, including a coating thickness control mechanism main body 1 and a base material conveying roller shaft 6. A slit extrusion coating fixed die head 2 is provided on the coating thickness control mechanism main body 1, and a slit extrusion coating movable die head 4 is hingedly installed on the slit extrusion coating fixed die head 2. A slurry tank 402 is opened inside the slit extrusion coating movable die head 4, and an exhaust hole 401 communicating with the slurry tank 402 is also opened at the upper end of the slit extrusion coating movable die head 4. This structure can store the slurry through the slurry tank 402, and the exhaust hole 401 can discharge the gas in the slurry to reduce bubbles. The slit extrusion coating movable die head 4 is mainly used to control the slit spacing, thereby controlling the coating thickness, which is a relatively mature technology at present. An arc-shaped first manifold 201 and a second manifold 202 are opened in the slit extrusion coating fixed die head 2, and the first manifold 201, the second manifold 202 and the slurry tank 402 are communicated. This structure connects the channel for slurry inlet at the first manifold 201 part of the slit extrusion coating fixed die head 2, so that the slurry can be distributed in the first manifold 201, and then the slurry is distributed to the second manifold 202 by the first manifold 201. The opening slits of the slit extrusion coating fixed die head 2 and the slit extrusion coating movable die head 4 face the base material conveying roller shaft 6, and side mounting frames 8 are provided at both ends of the base material conveying roller shaft 6, and a coating thickness laser detection mechanism 5 is installed above the base material conveying roller shaft 6. Linear driving mechanisms 7 are symmetrically installed at the bottom of the slit extrusion coating fixed die head 2, and a connecting piece 3 is connected to the bottom of the slit extrusion coating fixed die head 2. The lower end of the connecting piece 3 is connected with a movable limit seat 301 and a movable driving seat 302. The connecting piece 3 is of an L-shaped structure, and the connecting piece 3 is welded and fixed to both the movable limit seat 301 and the movable driving seat 302, and the connecting piece 3 is screwed and fixed to the bottom of the slit extrusion coating fixed die head 2. This structure enables the connecting piece 3 to connect the slit extrusion coating fixed die head 2 and the linear driving mechanism 7, and allows the linear driving mechanism 7 to drive the slit extrusion coating fixed die head 2 to move, which is convenient for the cleaning and maintenance of the coating thickness control mechanism main body 1. An electromagnetic switch controller 9 is installed on the side of the movable limit seat 301 facing the side mounting frame 8. A limit rod 701 and a transmission lead screw 702 are installed inside the linear driving mechanism 7, and the movable limit seat 301 movably penetrates through the limit rod 701, and the movable driving seat 302 threadedly penetrates through the transmission lead screw 702. A groove is opened on the side of the linear driving mechanism 7 close to the side mounting frame 8, and the groove position of the linear driving mechanism 7 corresponds to the position of the electromagnetic switch controller 9. This structure enables the switch controller used in cooperation with the electromagnetic switch controller 9 to be installed on the side mounting frame 8, so that when the electromagnetic switch controller 9 moves to this position, the power supply can be turned on to realize the switch control of the coating thickness control mechanism main body 1. The limit rod 701 and the transmission lead screw 702 are on the same straight line, and the linear driving mechanism 7 is screwed and installed on the side mounting frame 8,This structure enables the main body 1 of the coating thickness control mechanism to be movably installed relative to the side mounting frame 8 through the linear drive mechanism 7. Through the movable installation, the main body 1 of the coating thickness control mechanism is easier to maintain. At the same time, when maintaining the main body 1 of the coating thickness control mechanism, power can be cut off, improving safety.

[0020] Working principle: When using the coating thickness control mechanism for lithium-ion battery production, first, in the production of lithium-ion batteries, when the electrode material is coated by a coater, the electrode paste is introduced into the first manifold 201 of the slit extrusion coating fixed die head 2, then flows into the second manifold 202, and then fills the paste tank 402 of the slit extrusion coating movable die head 4. The exhaust hole 401 is used for exhaust treatment. The substrate transfer roller shaft 6 transfers the substrate, so that when the substrate passes through the main body 1 of the coating thickness control mechanism, coating treatment is carried out. The main body 1 of the coating thickness control mechanism controls the coating thickness through the slit at the outlets of the slit extrusion coating fixed die head 2 and the slit extrusion coating movable die head 4, and after coating, the thickness is detected by the coating thickness laser detection mechanism 5. The main body 1 of the coating thickness control mechanism moves through the linear drive mechanism 7 to control the distance between the substrate transfer roller shaft 6 and the slit extrusion coating fixed die head 2. When maintaining the main body 1 of the coating thickness control mechanism, the linear drive mechanism 7 drives the movable drive seat 302 to move through the transmission screw rod 702, realizing the position of the connecting piece 3, so that the slit extrusion coating fixed die head 2 moves away from the substrate transfer roller shaft 6. At the same time, during the movement of the connecting piece 3, the movable limit seat 301 is movably limited through the limit rod 701, and the electromagnetic switch controller 9 installed on the movable limit seat 301 is separated from the corresponding switch controller on the side mounting frame 8, realizing the power cut-off of the slit extrusion coating fixed die head 2, improving the safety of the main body 1 of the coating thickness control mechanism, and thus completing a series of operations.

[0021] Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A coating thickness control mechanism for lithium-ion battery production, comprising a coating thickness control mechanism main body (1) and a substrate conveying roller shaft (6), characterized in that: On the main body (1) of the coating thickness control mechanism, there is a slit extrusion coating fixed die head (2), and a slit extrusion coating movable die head (4) is hingedly installed on the slit extrusion coating fixed die head (2). The opening slits of the slit extrusion coating fixed die head (2) and the slit extrusion coating movable die head (4) face the substrate conveying roller shaft (6). Side mounting frames (8) are provided at both ends of the substrate conveying roller shaft (6), and a coating thickness laser detection mechanism (5) is installed above the substrate conveying roller shaft (6). Linear driving mechanisms (7) are symmetrically installed at the bottom of the slit extrusion coating fixed die head (2), and a connecting member (3) is connected to the bottom of the slit extrusion coating fixed die head (2). The lower end of the connecting member (3) is connected to a movable limit seat (301) and a movable driving seat (302), and an electromagnetic switch controller (9) is installed on one side of the movable limit seat (301) facing the side mounting frame (8). A limit rod (701) and a transmission lead screw (702) are installed in the linear driving mechanism (7), the movable limit seat (301) movably penetrates through the limit rod (701), and the movable driving seat (302) threadedly penetrates through the transmission lead screw (702).

2. The coating thickness control mechanism for lithium-ion battery production according to claim 1, wherein: A slurry tank (402) is formed inside the slit extrusion coating movable die head (4), and an exhaust hole (401) communicating with the slurry tank (402) is also formed at the upper end of the slit extrusion coating movable die head (4).

3. A coating thickness control mechanism for lithium-ion battery production according to claim 2, characterized in that: An arc-shaped first manifold (201) and a second manifold (202) are formed inside the slit extrusion coating fixed die head (2), and the first manifold (201), the second manifold (202) and the slurry tank (402) are in communication with each other.

4. A coating thickness control mechanism for lithium-ion battery production according to claim 1, characterized in that: The connecting member (3) is of an L-shaped structure, the connecting member (3) is fixedly welded to both the movable limit seat (301) and the movable driving seat (302), and the connecting member (3) is fixedly screwed to the bottom of the slit extrusion coating fixed die head (2).

5. The coating thickness control mechanism for lithium-ion battery production according to claim 1, characterized in that: A groove is formed on one side of the linear driving mechanism (7) close to the side mounting frame (8), and the position of the groove of the linear driving mechanism (7) corresponds to the position of the electromagnetic switch controller (9).

6. The coating thickness control mechanism for lithium-ion battery production according to claim 1, wherein: The limit rod (701) and the transmission lead screw (702) are on the same straight line, and the linear driving mechanism (7) is screwed and installed on the side mounting frame (8).

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