Double-layer coating die head
Through the design of the double-layer coating die, the position of the lithium-ion battery tabs is automatically reserved, which solves the difficulty of welding the tabs of lithium-ion batteries, improves production efficiency and battery performance, and reduces equipment costs and resource waste.
Patent Information
- Application Number
- CN202420203826.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-26
- Publication Date
- 2025-01-21
- Estimated Expiration
- 2034-01-26
AI Technical Summary
There are difficulties in welding electrodes after lithium-ion batteries. The traditional laser scraper process leads to powder sputtering, damage to electrodes, high equipment costs and waste of resources.
Using a double-layer coating die, three die heads and two gaskets are used to create two independent extrusion cavities and staggered discharge gaps, automatically leaving the tab position.
It solves the problem of welding tabs of lithium-ion batteries after coating, improves production efficiency and battery performance, avoids powder sputtering and pole piece damage, and reduces equipment costs and resource waste.
Smart Images
Figure CN222369461U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of lithium battery manufacturing, and more specifically, to a double-layer coating die head. Background Art
[0002] With the rapid development of technology and the continuous expansion of demand, lithium-ion batteries have been widely used. Lithium-ion batteries play a core role in important fields such as modern mobile electronic products and new energy vehicles. However, in the production process of lithium-ion batteries, there is a crucial process that must be given enough attention, that is, the coating process. The quality and accuracy of the coating process will directly affect the performance of the battery and even determine the overall quality of the battery. In the traditional coating process, the coating process is usually carried out continuously because the continuous coating is easy to operate and can improve production efficiency. However, this coating method also has a major disadvantage when used in the production of lithium-ion batteries. One of the most critical problems is that since the battery pole piece needs to be welded after coating, this involves the problem of connecting the pole ear with the pole piece covered with the coating. The solder used for welding cannot be effectively welded on the surface of the coating, making the welding of the pole ear a big problem.
[0003] In order to solve this problem, the industry has adopted a new solution, which is to use lasers to scrape the coated pole pieces. Through the scraping process, an area without coating is scraped on the surface of the pole piece, and then the pole ear is welded on this area. However, this process still has many problems. First, the laser scraping process will produce some scraped material powder. These material powders may sputter on the surface of the pole piece or adhere to the surface of the pole piece. These material powders will have a very serious impact on the battery, which may cause internal short circuits, cause battery self-discharge, and significantly reduce battery performance. Secondly, the laser scraping process is prone to damage to the pole piece. Since the coated pole piece needs to go through processes such as rolling and winding, the pole piece may fold, break, etc. during the scraping process, which not only affects the quality of the pole piece itself, but also brings troubles to the subsequent processes.
[0004] In addition, although it is technically feasible to use laser equipment for scraping, the cost of the equipment is very high. This undoubtedly puts a lot of additional pressure on production costs. Not only that, the laser equipment will also generate radiation during operation, which has a great impact on operators and the environment. Finally, laser scraping technology will cause waste of paint. The empty foil area generated during the scraping process cannot be reused, resulting in a waste of resources. Utility Model Content
[0005] In order to overcome the shortcomings of the prior art, the utility model provides a double-layer coating die head, which adopts three die heads and two gaskets arranged therein, and can automatically reserve the position of the pole ear during the coating process by creating two independent extrusion cavities and staggered discharge notches, thereby solving the problem of welding the pole ears of lithium-ion batteries after coating and improving production efficiency and battery performance.
[0006] The technical solution adopted by the utility model to solve the technical problem is: a double-layer coating die head, the improvement of which is that it includes an upper die head, a middle die head, a lower die head, a first gasket and a second gasket;
[0007] The middle die head is arranged between the upper die head and the lower die head, the first gasket is arranged between the upper die head and the middle die head, the second gasket is arranged between the middle die head and the lower die head, a plurality of first discharge notches are arranged side by side on the first gasket, a plurality of second discharge notches are arranged side by side on the second gasket, the first discharge notches and the second discharge notches are arranged in a staggered manner, a first groove is arranged at a position of the upper die head close to the first discharge notch, the first groove fits with the first gasket to form a first extrusion cavity, and the first extrusion cavity is communicated with the first discharge notch, a second groove is arranged at a position of the lower die head close to the second discharge notch, the second groove fits with the second gasket to form a second extrusion cavity, and the second extrusion cavity is communicated with the second discharge notch.
[0008] In the above structure, a plurality of hinge blocks are fixedly mounted on the middle die head, and the hinge block has two movable ends, which are respectively fixedly connected to the upper die head and the lower die head, so as to realize the opening and closing of the upper die head and the lower die head with respect to the middle die head.
[0009] In the above structure, the bottom of the upper die head and the top of the lower die head are respectively provided with a first coating lip and a second coating lip, the first coating lip and the second coating lip are both oblique protrusions, the first coating lip can be applied in conjunction with the first gasket, and the second coating lip can be applied in conjunction with the second gasket.
[0010] In the above structure, the upper die head and the lower die head are respectively provided with a first feed channel and a second feed channel, the first feed channel is communicated with the first extrusion chamber, and the second feed channel is communicated with the second extrusion chamber.
[0011] In the above structure, the upper die head is provided with an electric cylinder intermittent valve, and the electric cylinder intermittent valve is connected to the first feed channel.
[0012] In the above structure, the lower die head is provided with a pneumatic three-way ball valve, and the pneumatic three-way ball valve is connected to the second feed channel.
[0013] In the above structure, the double-layer coating die head also includes a double-layer back plate, which is fixedly mounted on the middle die head. The upper die head and the lower die head are provided with threaded holes. The two ends of the double-layer back plate are respectively connected to the upper die head and the lower die head by screws through the threaded holes to adjust the alignment degree of the upper die head, the middle die head and the lower die head.
[0014] In the above structure, the double-layer coating die head also includes a first fixed block and a second fixed block, and the upper die head, the middle die head and the lower die head are all provided with threaded holes, and the two ends of the first fixed block are respectively connected to the upper die head and the middle die head screws through threaded holes, and the two ends of the second fixed block are respectively connected to the middle die head and the lower die head screws through threaded holes.
[0015] In the above structure, a vertical rod is fixedly connected to the movable end of the hinge block, and the upper die head and the lower die head can be better pried by the vertical rod to realize the opening and closing of the upper die head and the lower die head with respect to the middle die head.
[0016] In the above structure, the upper die head is provided with a plurality of micrometers.
[0017] The beneficial effects of the utility model are as follows: by adopting three die heads and two gaskets arranged therein, by creating two independent extrusion cavities and staggered discharge notches, the position of the pole ear can be automatically reserved during the coating process, thereby solving the problem of welding the pole ear of the lithium-ion battery after coating and improving the production efficiency and battery performance. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 This is a schematic diagram of the overall structure of a double-layer coating die head of the utility model;
[0019] Figure 2 It is a structural schematic diagram of a gasket of a double-layer coating die head of the utility model;
[0020] Figure 3 This is a schematic diagram of the upper die structure of a double-layer coating die of the utility model;
[0021] Figure 4 This is a schematic diagram of the lower die structure of a double-layer coating die of the utility model;
[0022] Figure 5 This is a schematic diagram of the cross-sectional structure of a double-layer coating die of the utility model;
[0023] Figure 6 This is a coating effect diagram of a double-layer coating die head of the utility model. DETAILED DESCRIPTION
[0024] The utility model is further described below in conjunction with the accompanying drawings and embodiments.
[0025] The following will clearly and completely describe the concept, specific structure and technical effects of the utility model in combination with the embodiments and drawings, so as to fully understand the purpose, characteristics and effects of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, other embodiments obtained by technicians in this field without creative work are all within the scope of protection of the utility model. In addition, all the connection / connection relationships involved in the patent do not refer to the direct connection of components, but refer to the formation of a better connection structure by adding or reducing connection accessories according to the specific implementation situation. The various technical features in the creation of the utility model can be combined interchangeably without conflicting with each other.
[0026] Reference Figures 1 to 4 As shown, the utility model discloses a double-layer coating die. Specifically, the device includes an upper die 10, a middle die 20, a lower die 30, a first gasket 40 and a second gasket 50; the middle die 20 is arranged between the upper die 10 and the lower die 30, the upper die 10 and the middle die 20 are detachably connected, the upper die 10 and the middle die 20 are detachably connected, the first gasket 40 is arranged between the upper die 10 and the middle die 20, and the second gasket 50 is arranged between the middle die 20 and the lower die 30. The first gasket 40 is provided with a plurality of first discharge notches 60 arranged side by side, and the second gasket 50 is provided with a plurality of second discharge notches 70 arranged side by side. The upper die head 10 is provided with a first groove 1011 near the first discharge notch 60, and the first groove 1011 is fitted with the first gasket 40 to form a first extrusion cavity 301, and the first extrusion cavity 301 is communicated with the first discharge notch 60. The lower die head 30 is provided with a second groove 3011 near the second discharge notch 70, and the second groove 3011 is fitted with the second gasket 50 to form a second extrusion cavity 301, and the second extrusion cavity 301 is communicated with the second discharge notch 70. The bottom of the upper die head 10 and the top of the lower die head 30 are provided with a first coating lip 100 and a second coating lip 110, respectively. The first coating lip 100 and the second coating lip 110 are both oblique protrusions. The first coating lip 100 can be applied in conjunction with the first gasket 40, and the second coating lip 110 can be applied in conjunction with the second gasket 50. The oblique protrusion can better guide the coating material, so that the coating material can be evenly distributed on the substrate when passing through the die head, thereby improving the uniformity of coating. This arrangement also helps to reduce the residue of coating material on the surface of the die head, reduce the waste of coating material, and thus improve the efficiency of coating.
[0027] Further, such as Figure 1A plurality of hinge blocks 201 are fixedly mounted on the middle die head 20. The hinge block 201 has two movable ends, which are respectively fixedly connected to the upper die head 10 and the lower die head 30, so that the upper die head 10 and the lower die head 30 can be opened and closed relative to the middle die head 20. This arrangement also enables the equipment to adapt to gaskets of different styles. Because of the presence of the hinge block 201, the upper and lower die heads 30 can be easily opened for cleaning and maintenance, thereby improving the maintenance efficiency of the equipment. A vertical rod 80 is fixedly connected to the movable end of the hinge block 201, through which the upper die head 10 and the lower die head 30 can be better pried, so that the upper die head 10 and the lower die head 30 can be opened and closed relative to the middle die head 20. The double-layer coating die head also includes a double-layer back-connecting plate 202, which is in a "T" shape. The short side of the double-layer back-connecting plate 202 is fixedly mounted on the middle die head 20, and the upper die head 10 and the lower die head 30 are provided with threaded holes. The two ends of the long side of the double-layer back-connecting plate 202 are respectively connected to the upper die head 10 and the lower die head 30 by screws through the threaded holes to adjust the alignment of the upper die head 10, the middle die head 20 and the lower die head 30. Through the connection form of the threaded holes and the screws, the distance and relative position between the die heads can be easily adjusted, so that a set of die heads can be used on production lines with different specifications and different requirements. The upper die head 10, the middle die head 20 and the lower die head 30 can be accurately aligned by the double-layer back-connecting plate 202, and the coating can be ensured to be uniform and continuous on the contacted surface during the coating process, so that the coating effect is more outstanding.
[0028] Further, if Figures 2 to 4 As shown, the first gasket 40 is provided with a plurality of first discharge notches 60 at intervals, and the gasket is provided with a plurality of second discharge notches 70 at intervals. The first discharge notches 60 and the second discharge notches 70 are arranged in a staggered manner. After the staggered manner, the slurry left by the first discharge port 60 and the second discharge port 70 can be independently continuously coated and inter-coated, and mutually dissolved on the surface of the pole piece to form a rectangular blank area. The upper die head 10 and the lower die head 30 are respectively provided with a first extrusion cavity 101 and a second extrusion cavity 301, the first extrusion cavity 101 is connected to the first discharge notch 60, and the second extrusion cavity 301 is connected to the second extrusion coating lip. The upper die head 10 and the lower die head 30 are respectively provided with a first feed channel 102 and a second feed channel 302, the first feed channel 102 is connected to the first extrusion cavity 101, and the second feed channel 302 is connected to the second extrusion cavity 301. The upper and lower die heads 30 are respectively provided with independent extrusion chambers and feed channels, which reduces the risk of mixing different materials. The design of connecting the feed channel with the extrusion chamber can ensure the continuous supply of coating, and effectively prevent coating breakage or unevenness caused by interruption of coating supply. Continuous coating and intermittent coating use different extrusion chambers. Continuous coating feeds normally during the entire coating process, and then intermittent coating closes the feed pipe at the position that needs to be left empty, so as to achieve controlled coating emptying.
[0029] like Figure 6 As shown, Figure 6 The product is a finished coating product, where the shaded part is the coated part, and the blank square in the middle is the part without coating. The large shaded frame part is the part that is coated by the lower die head 30, the middle die head 20 and the second gasket 50, and is continuously coated through the second discharge notch 70. The small shaded frame part is the part that is coated by the upper die head 10, the middle die head 20 and the first gasket 40, and is intermittently coated through the first discharge notch 60. During the operation of the equipment, the intermittent coating of the small shaded frame part can be achieved by closing or opening the feed pipe, and then the middle white square without coating is formed, which is convenient for the welding of the tab. Figure 6 The up and down direction is the belt running direction, and the effect of one row of intermediate coating and one row of continuous coating is achieved through the cooperation of the above structure.
[0030] like Figures 1 to 4 As shown, the double-layer coating die head further includes a first fixing block 203 and a second fixing block 204. The upper die head 10, the middle die head 20 and the lower die head 30 are all provided with threaded holes. The two ends of the first fixing block 203 are respectively screwed to the upper die head 10 and the middle die head 20 through the threaded holes, and the two ends of the second fixing block 204 are respectively screwed to the middle die head 20 and the lower die head 30 through the threaded holes. Through the connection of the first fixing block 203 and the second fixing block 204, the upper die head 10, the middle die head 20 and the lower die head 30 can also be accurately aligned to form a stable fixation, effectively preventing the die head 20 from swinging or shifting during the coating process, and ensuring the stability of the coating process.
[0031] Furthermore, the upper die head 10 is provided with a plurality of micrometers 90, which are extremely high-precision measuring tools. The use of a plurality of micrometers 90 can more accurately measure and adjust the position and gap of the upper die head 10. Through the readings of the plurality of micrometers 90, the state of the die head can be monitored in real time, and problems can be discovered and solved in time to ensure the smooth progress of production. The upper die head 10 is provided with an electric cylinder intermittent valve 103, which is connected to the first feed channel 102. The electric cylinder intermittent valve 103 can more accurately control the supply of the coating, so that the flow rate of the coating during the feeding process is well regulated, and the stability of the coating supply is ensured, thereby improving the quality of the coating. The electric cylinder intermittent valve 103 can also work continuously and stably, greatly improving the working efficiency of the equipment, and can continuously meet the needs of continuous large-scale coating. The lower die head 30 is provided with a pneumatic three-way ball valve 303, which is connected to the second feed channel 302. The pneumatic three-way ball valve 303 has good sealing performance, can effectively prevent paint leakage and reduce paint waste. Since this is the continuous coating part, the whole process basically remains unchanged, so the requirements for the valve are not so high. Setting the pneumatic three-way ball valve 303 is cheaper than the electric cylinder intermittent valve 103, and can also play a role in reducing costs.
[0032] The beneficial effects of the utility model are as follows: by adopting three die heads and two gaskets arranged therein, by creating two independent extrusion cavities and staggered discharge notches, the position of the pole ear can be automatically reserved during the coating process, thereby solving the problem of welding the pole ear of the lithium-ion battery after coating and improving the production efficiency and battery performance.
[0033] The above is a specific description of the preferred implementation of the utility model, but the invention of the utility model is not limited to the described embodiments. Technical personnel familiar with the field can also make various equivalent deformations or substitutions without violating the spirit of the utility model. These equivalent deformations or substitutions are all included in the scope defined by the claims of this application.
Claims
1. A double-layer coating die head, characterized in that: It includes an upper die head, a middle die head, a lower die head, a first gasket and a second gasket; The middle die head is arranged between the upper die head and the lower die head, the first gasket is arranged between the upper die head and the middle die head, the second gasket is arranged between the middle die head and the lower die head, a plurality of first discharge notches are arranged side by side on the first gasket, a plurality of second discharge notches are arranged side by side on the second gasket, the first discharge notches and the second discharge notches are arranged in a staggered manner, a first groove is arranged at a position of the upper die head close to the first discharge notch, the first groove fits with the first gasket to form a first extrusion cavity, and the first extrusion cavity is communicated with the first discharge notch, a second groove is arranged at a position of the lower die head close to the second discharge notch, the second groove fits with the second gasket to form a second extrusion cavity, and the second extrusion cavity is communicated with the second discharge notch.
2. A double-layer coating die head according to claim 1, characterized in that: A plurality of hinge blocks are fixedly mounted on the middle die head. The hinge block has two movable ends, and the two movable ends are respectively fixedly connected to the upper die head and the lower die head, so that the upper die head and the lower die head can be opened and closed with respect to the middle die head.
3. A double-layer coating die head according to claim 1, characterized in that: The bottom of the upper die head and the top of the lower die head are respectively provided with a first coating lip and a second coating lip, the first coating lip and the second coating lip are both oblique protrusions, the first coating lip can be applied in conjunction with a first gasket, and the second coating lip can be applied in conjunction with a second gasket.
4. A double-layer coating die head according to claim 3, characterized in that: The upper die head and the lower die head are respectively provided with a first feed channel and a second feed channel, the first feed channel is communicated with the first extrusion cavity, and the second feed channel is communicated with the second extrusion cavity.
5. A double-layer coating die head according to claim 4, characterized in that: The upper die head is provided with an electric cylinder intermittent valve, and the electric cylinder intermittent valve is connected to the first feed channel.
6. A double-layer coating die head according to claim 4, characterized in that: The lower die head is provided with a pneumatic three-way ball valve, and the pneumatic three-way ball valve is connected to the second feed channel.
7. A double-layer coating die head according to claim 1, characterized in that: The double-layer coating die head also includes a double-layer back-connecting plate, which is fixedly mounted on the middle die head. The upper die head and the lower die head are provided with threaded holes. The two ends of the double-layer back-connecting plate are respectively connected to the upper die head and the lower die head with screws through the threaded holes to adjust the alignment degree of the upper die head, the middle die head and the lower die head.
8. A double-layer coating die head according to claim 1, characterized in that: The double-layer coating die head also includes a first fixed block and a second fixed block. The upper die head, the middle die head and the lower die head are all provided with threaded holes. The two ends of the first fixed block are respectively connected to the upper die head and the middle die head screws through the threaded holes, and the two ends of the second fixed block are respectively connected to the middle die head and the lower die head screws through the threaded holes.
9. A double-layer coating die head according to claim 2, characterized in that: A vertical rod is fixedly connected to the movable end of the hinge block, and the upper die head and the lower die head can be better pried through the vertical rod to achieve the opening and closing of the upper die head and the lower die head with respect to the middle die head.
10. A double-layer coating die head according to claim 1, characterized in that: The upper die head is provided with a plurality of micrometers.