Battery diaphragm spraying device

Abstract

The utility model discloses a battery diaphragm spraying device. The battery diaphragm spraying device comprises an unwinding roller, a coating assembly, a drying oven, a rolling assembly and a winding roller which are sequentially arranged in the tape conveying direction of a base diaphragm, the coating assembly comprises a coating die head and a back roller which are oppositely arranged; the coating die head is provided with a first coating cavity and a second coating cavity which are mutually independent, and the first coating cavity and the second coating cavity are respectively used for simultaneously coating a first slurry coating and a second slurry coating on the same side of the base film; the coating die head comprises an upper die, a middle die and a lower die which are sequentially stacked, a first gasket is arranged between the lower die and the middle die, and the lower die, the middle die and the first gasket jointly define the first coating cavity; and a second gasket is arranged between the upper mold and the middle mold, and the upper mold, the middle mold and the second gasket jointly define the second coating cavity. According to the diaphragm base membrane coating device, multiple layers of diaphragm base membranes can be coated at the same time, the production process flow is simplified, the coating efficiency and the coating quality uniformity are improved, and the production cost is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of battery diaphragm production equipment, in particular to a battery diaphragm spraying device. Background Art

[0002] The battery separator is a key component of a battery. Its primary function is to separate the positive and negative electrodes, preventing internal short circuits while allowing ions in the electrolyte to pass through. To improve battery performance, such as energy density, cycle life, and safety, existing technologies typically utilize composite separators—one or more functional coatings applied to a base separator. These functional coatings can enhance the separator's mechanical strength, thermal stability, flame retardancy, wettability, and other properties.

[0003] However, existing diaphragm coating devices usually adopt a single-layer coating structure, that is, only one layer of coating can be applied to the diaphragm at a time. When it is necessary to prepare a diaphragm with a multi-layer composite structure, multiple coating processes are required. After each layer is applied, the coating needs to be dried and cured, and then the next layer is applied until all the coatings are prepared. This multiple coating method has the following problems: First, the production efficiency is low, and the large number of coating times leads to a long production cycle; second, the coating quality is uneven, and the process parameters are difficult to accurately control during the multiple coating process, resulting in large deviations in indicators such as coating thickness and uniformity of different batches of products, and poor product consistency. Third, the production cost is high, the equipment utilization rate is low, and the energy consumption is high.

[0004] Therefore, there is an urgent need to provide a new battery diaphragm coating device that can achieve simultaneous coating of multiple layers of diaphragm base film, simplify the production process, improve coating efficiency and coating quality uniformity, and reduce production costs to meet the growing demand of the battery industry for high-performance and low-cost diaphragms. Utility Model Content

[0005] The purpose of the present invention is to provide a battery diaphragm spraying device to address the deficiencies of the existing technology, which can achieve simultaneous coating of multiple layers of diaphragm base film, simplify the production process, improve coating efficiency and coating quality uniformity, and reduce production costs.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A battery separator spraying device comprises an unwinding roller, a coating assembly, an oven, a rolling assembly and a winding roller arranged in sequence along the running direction of the base film; the coating assembly comprises a coating die head and a backing roller arranged opposite to each other;

[0008] The coating die head is provided with a first coating chamber and a second coating chamber which are independent of each other and are respectively used to simultaneously apply the first slurry coating and the second slurry coating on the same side of the base film;

[0009] The coating die head comprises an upper die, a middle die and a lower die stacked in sequence, a first gasket is provided between the lower die and the middle die, and the lower die, the middle die and the first gasket together enclose the first coating cavity;

[0010] A second gasket is provided between the upper mold and the middle mold, and the upper mold, the middle mold and the second gasket together enclose the second coating cavity.

[0011] Preferably, the device further comprises a plurality of guide rollers for guiding the transfer path of the base film between the components.

[0012] Preferably, the oven is configured to dry the coated base film to cure the first slurry coating layer and the second slurry coating layer.

[0013] Preferably, the rolling assembly includes a first pressing roller and a second pressing roller arranged opposite to each other in an upper and lower direction, and is used to compact the baked diaphragm.

[0014] Preferably, the surfaces of the first pressing roller and the second pressing roller are both provided with micron-level embossing, which is used to simultaneously perform embossing treatment on the surface of the diaphragm during the compaction process.

[0015] Preferably, the surface of the back roller is provided with an anti-stick coating, and a heater is provided inside the back roller for adjusting the surface temperature of the back roller.

[0016] Preferably, the angle between the first coating cavity and the second coating cavity is α, 30°≤α≤60°.

[0017] Preferably, the first coating chamber and the second coating chamber are respectively connected to independent feeding systems, and each feeding system includes a storage tank, a delivery pump and a flow control valve.

[0018] Preferably, the device further comprises a tension control device provided between the coating assembly and the oven, for adjusting the tension of the base film to ensure coating uniformity.

[0019] Compared with the prior art, the beneficial effects of the present invention are: the present invention provides a battery diaphragm spraying device, comprising a unwinding roller, a coating assembly, an oven, a rolling assembly and a winding roller arranged in sequence along the walking direction of the base film; the coating assembly comprises a coating die head and a back roller arranged opposite to each other; the coating die head is provided with a first coating chamber and a second coating chamber which are independent of each other, and are respectively used to simultaneously apply a first slurry coating and a second slurry coating on the same side of the base film; the coating die head comprises an upper mold, a middle mold and a lower mold which are stacked in sequence, a first gasket is arranged between the lower mold and the middle mold, and the lower mold, the middle mold and the first gasket together enclose the first coating chamber; a second gasket is arranged between the upper mold and the middle mold, and the upper mold, the middle mold and the second gasket together enclose the second coating chamber. Among them, the utility model is able to achieve simultaneous multi-layer coating by providing an independent first coating chamber and a second coating chamber in the same coating die head; this method reduces the time of multiple coatings, shortens the production cycle, and greatly improves the coating efficiency; at the same time, the independent coating chamber design and the anti-stick coating of the back roller reduce the adhesion and uneven flow of the coating during the coating process, ensuring uniform coating thickness, thereby improving the consistency and quality of the product; in addition, since the number of coatings and processes are reduced, the device can significantly reduce labor costs and material waste in the production process, thereby reducing overall production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic structural diagram of a battery diaphragm spraying device of the present utility model;

[0021] Figure 2 This is a structural schematic diagram of the first gasket of the battery diaphragm spraying device of the present utility model;

[0022] Figure 3 This is a schematic structural diagram of the second gasket of the battery diaphragm spraying device of the present invention.

[0023] In the figure: 1. unwinding roller; 2. coating assembly; 21. coating die; 211. first coating chamber; 212. second coating chamber; 213. upper die; 214. middle die; 215. lower die; 216. first gasket; 217. second gasket; 22. backing roller; 3. oven; 4. rolling assembly; 41. first pressure roller; 42. second pressure roller; 5. winding roller; 6. guide roller; 10. base film; 20. first slurry coating; 30. second slurry coating. DETAILED DESCRIPTION

[0024] In order to make the technical solutions and advantages of the present invention clearer, the present invention and its beneficial effects will be described in further detail below in conjunction with specific implementation methods and the accompanying drawings, but the implementation methods of the present invention are not limited thereto.

[0025] like Figures 1 to 3 As shown, the present application provides a battery diaphragm spraying device, comprising an unwinding roller 1, a coating assembly 2, an oven 3, a rolling assembly 4 and a winding roller 5 arranged in sequence along the running direction of the base film 10; the coating assembly 2 comprises a coating die head 21 and a backing roller 22 arranged opposite to each other;

[0026] The coating die 21 is provided with a first coating chamber 211 and a second coating chamber 212 which are independent of each other and are used to simultaneously coat the first slurry coating 20 and the second slurry coating 30 on the same side of the base film 10;

[0027] The coating die head 21 includes an upper die 213, a middle die 214, and a lower die 215 stacked in sequence. A first gasket 216 is provided between the lower die 215 and the middle die 214. The lower die 215, the middle die 214, and the first gasket 216 together enclose a first coating cavity 211.

[0028] A second gasket 217 is provided between the upper mold 213 and the middle mold 214 . The upper mold 213 , the middle mold 214 and the second gasket 217 together enclose a second coating cavity 212 .

[0029] The battery diaphragm spraying device of the present application can realize the simultaneous coating of multiple layers of the diaphragm base film 10 through a rationally designed structure, thereby simplifying the production process. Specifically, the design of the device has the following advantages:

[0030] 1) Improved coating efficiency: Multiple layers of coating can be achieved by providing independent coating chambers within the same coating die 21. This reduces the time required for multiple coatings, shortens the production cycle, and significantly improves coating efficiency.

[0031] 2) Uniform coating quality: The independent coating chamber design and the anti-stick coating of the back roller 22 reduce the adhesion and uneven flow of the coating during the coating process, ensuring uniform coating thickness, thereby improving product consistency and quality.

[0032] 3) Reduce production costs: By reducing the number of coating times and processes, the device can significantly reduce labor costs and material waste in the production process, thereby reducing overall production costs.

[0033] In one embodiment of the present application, the device also includes a plurality of guide rollers 6 for guiding the transmission path of the base film 10 between the components, which can ensure the smooth transmission of the base film 10, reduce the risk of film damage due to friction or unevenness, and thus improve the quality of the coated product.

[0034] In one embodiment of the present application, the backing roller 22 is configured to support the base film 10 to ensure the stability of the base film 10 during the coating process.

[0035] In one embodiment of the present application, the oven 3 is configured to dry the coated base film 10 to solidify the first slurry coating 20 and the second slurry coating 30. Drying immediately after coating to solidify the coating can effectively prevent the coating from flowing in a low-temperature environment, thereby ensuring the stability and adhesion of the coating and improving the performance of the final product.

[0036] In one embodiment of the present application, the rolling assembly 4 includes a first pressing roller 41 and a second pressing roller 42 arranged opposite to each other in an upper and lower direction, which are used to compact the baked diaphragm to ensure good bonding between the coating and the base film 10, thereby improving the overall mechanical properties of the diaphragm.

[0037] In one embodiment of the present application, the surfaces of the first and second rollers 41, 42 are each provided with micron-scale embossing, which is used to simultaneously emboss the surface of the separator during the compaction process. The micron-scale embossing of the roller surfaces not only increases the surface roughness of the separator, enhancing the dielectric properties of the battery, but also improves the density of the coating during the compaction process, improving the overall performance of the separator.

[0038] In one embodiment of the present application, the backing roller 22 is provided with an anti-stick coating and a heater is provided inside the backing roller 22 to regulate the surface temperature of the backing roller 22. The provision of the anti-stick coating on the backing roller 22 effectively reduces the adhesion of the coating to the roller surface and maintains coating uniformity. At the same time, the design of the heater can regulate the temperature of the backing roller 22, further optimizing the coating process.

[0039] In one embodiment of the present application, the angle α between the first coating chamber 211 and the second coating chamber 212 is 30°≤α≤60°. Setting the angle between the first coating chamber 211 and the second coating chamber 212 to 30° to 60° can optimize the flow state of the coating, ensure uniform coating overlap, and improve coating adhesion and uniformity.

[0040] In one embodiment of the present application, the first coating chamber 211 and the second coating chamber 212 are each connected to an independent feed system, each comprising a storage tank, a delivery pump, and a flow control valve. By configuring each coating chamber with an independent feed system, adjustments can be made to the characteristics of different coatings, enabling precise control of coating thickness and ratio, thereby improving coating performance.

[0041] In one embodiment of the present application, the coating die 21 further includes an adjustable gap adjustment device provided at the outlets of the first coating chamber 211 and the second coating chamber 212 . The adjustment device is preferably a pressure block with a micrometer for controlling the coating thickness.

[0042] In one embodiment of the present application, the device further includes a tension control device disposed between the coating assembly 2 and the oven 3 for adjusting the tension of the base film 10 to ensure coating uniformity and avoid coating defects caused by uneven tension.

[0043] Based on the disclosure and teachings of the above description, those skilled in the art will be able to make changes and modifications to the above embodiments. Therefore, the present invention is not limited to the specific embodiments described above. Any obvious improvements, substitutions, or modifications made by those skilled in the art based on the present invention fall within the scope of protection of the present invention. In addition, although certain specific terms are used in this description, these terms are for convenience only and do not constitute any limitation on the present invention.

Claims

1. A battery diaphragm spraying device, characterized in that: The invention comprises an unwinding roller, a coating assembly, an oven, a rolling assembly and a winding roller which are sequentially arranged along the running direction of the base film; the coating assembly comprises a coating die head and a backing roller which are arranged opposite to each other; The coating die head is provided with a first coating chamber and a second coating chamber which are independent of each other and are respectively used to simultaneously apply the first slurry coating and the second slurry coating on the same side of the base film; The coating die head comprises an upper die, a middle die and a lower die stacked in sequence, a first gasket is provided between the lower die and the middle die, and the lower die, the middle die and the first gasket together enclose the first coating cavity; A second gasket is provided between the upper mold and the middle mold, and the upper mold, the middle mold and the second gasket together enclose the second coating cavity.

2. The battery diaphragm spraying device according to claim 1, characterized in that: The device further comprises a plurality of guide rollers for guiding a transmission path of the base film between the components.

3. The battery diaphragm spraying device according to claim 1, characterized in that: The oven is configured to dry the coated base film to cure the first slurry coating layer and the second slurry coating layer.

4. The battery diaphragm spraying device according to claim 1, characterized in that: The roller pressing assembly includes a first pressing roller and a second pressing roller that are arranged opposite to each other up and down, and is used to compact the baked diaphragm.

5. The battery diaphragm spraying device according to claim 4, characterized in that: The surfaces of the first pressing roller and the second pressing roller are both provided with micron-level embossing, which is used to simultaneously emboss the surface of the diaphragm during the compaction process.

6. The battery diaphragm spraying device according to claim 1, characterized in that: The surface of the back roller is provided with an anti-stick coating, and the interior of the back roller is provided with a heater for adjusting the surface temperature of the back roller.

7. The battery diaphragm spraying device according to claim 1, characterized in that: The included angle between the first coating cavity and the second coating cavity is α, 30°≤α≤60°.

8. The battery diaphragm spraying device according to claim 1, characterized in that: The first coating chamber and the second coating chamber are respectively connected to mutually independent feeding systems, and each feeding system includes a storage tank, a delivery pump and a flow control valve.

9. The battery diaphragm spraying device according to claim 1, characterized in that: The device also includes a tension control device arranged between the coating assembly and the oven, which is used to adjust the tension of the base film to ensure the uniformity of the coating.

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