A replaceable coating head for flexible perovskite cell manufacturing

Abstract

The application provides a replaceable coating head for flexible perovskite battery manufacturing, which comprises a front die head, an adjusting gasket, a middle die head, a slot core and a rear die head arranged in sequence from left to right; a plurality of flow channel groups are arranged on the slot core in the circumferential direction, each flow channel group is provided with a transverse liquid guide groove and a longitudinal flow channel, the transverse liquid guide groove is along the axis direction of the slot core, the longitudinal flow channel is along the radial direction of the slot core, and the longitudinal flow channel and the transverse flow channel are communicated. The application can replace the transverse liquid guide groove without completely disassembling the coating head and the gap adjusting gasket, reduce precision disturbance, and ensure the slit gap precision.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of battery coating, in particular to an easy-to-replace coating head for flexible perovskite battery manufacturing. BACKGROUND

[0002] In the preparation process of perovskite solar cells, slot coating technology is mainly used for coating perovskite precursor solution, electron transport layer and hole transport layer, etc. Slot coating technology coats wet film in a non-contact manner, and obtains a wet film with controllable thickness on the basis of ensuring that the original substrate is not damaged. At present, in the field of perovskite solar cells, the difference in surface tension and resistance of perovskite solution in the slot makes it difficult for a part of the solution with too low viscosity to fully spread in the horizontal direction, and a large amount of air cannot be discharged in the coating head, resulting in phenomena such as air bubbles in the coating, uneven liquid output and unstable flow, etc. Therefore, it is necessary to reduce the width of the horizontal liquid guide groove or adjust the viscosity of the perovskite solution. However, for perovskite solution, the fluid properties of the solution also affect the crystallization degree of perovskite. In terms of the width of the horizontal liquid guide groove, the width of the horizontal liquid guide groove of a high-precision slot coating head cannot be changed after processing and shaping, and the coating head needs to be completely disassembled for cleaning.

[0003] Chinese patent application No. 202111540091.4 discloses a high-uniformity coating head device for slot coating equipment, which uses spring-pressed balls to contact the substrate, and the solution flows out along the balls. The device has a complex structure and is not easy to disassemble and clean. During contact with the coating surface, the coating surface is easily damaged. Chinese patent application No. 202211369000.X discloses a slot coating equipment and a coating method, which realizes multi-mode head step-by-step coating by mounting multiple coating heads on a set of rotary driving assemblies. The four mode heads of the coating device designed by this method are integrated on a main shaft, and the mode heads are heavy, so that the main shaft is deformed under the action of gravity, the precision is reduced, and the cost of the device is high. SUMMARY

[0004] In view of the deficiencies in the prior art, the present application provides an easy-to-replace coating head for flexible perovskite battery manufacturing, which can replace the horizontal liquid guide groove without completely disassembling the coating head and adjusting the gap pad, reduce precision disturbance, and ensure the precision of the slot gap.

[0005] The present application achieves the above technical purpose through the following technical means.

[0006] An easy-to-replace coating head for flexible perovskite battery manufacturing includes front mode heads, adjusting pads, middle mode heads, groove cores and rear mode heads arranged in order from left to right.

[0007] The groove core is provided with a plurality of flow channel groups in the circumferential direction, each of the flow channel groups is provided with a transverse liquid guide groove and a longitudinal flow channel, the transverse liquid guide groove is along the axis direction of the groove core, the longitudinal flow channel is along the radial direction of the groove core, and the longitudinal flow channel and the transverse liquid guide groove are communicated.

[0008] Further, the plurality of flow channel groups are uniformly distributed in the circumferential direction of the groove core.

[0009] Further, the transverse liquid guide groove is semicircular in cross section, and the radii of the plurality of transverse liquid guide grooves are not equal.

[0010] Further, the number of the flow channel groups is three.

[0011] Further, the radii of the three transverse liquid guide grooves increase in turn.

[0012] Further, the middle die head comprises a middle upper die head and a middle lower die head, the adjusting gasket is arranged between the front die head and the middle upper die head, an inlet flow channel is arranged between the middle upper die head and the rear die head, an outlet flow channel is arranged between the middle lower die head and the front die head, liquid flows into the longitudinal flow channel and the transverse liquid guide groove from the inlet flow channel, and then flows out from the outlet flow channel.

[0013] Further, the front die head, the adjusting gasket and the middle die head are connected through a first bolt fastener, and the front die head, the adjusting gasket, the middle die head, the groove core and the rear die head are connected through a second bolt fastener.

[0014] Further, the groove core is a columnar octahedron comprising six side surfaces, the six side surfaces comprise three circular arc surfaces and three rectangular planes, and the circular arc surfaces and the rectangular planes are arranged at intervals.

[0015] Further, the three transverse liquid guide grooves are arranged on the three rectangular planes respectively.

[0016] Further, the radius of the transverse liquid guide groove is 1mm-5mm, and the length of the transverse liquid guide groove is 100-150mm.

[0017] The beneficial effects of the present application are as follows:

[0018] In the present application, a plurality of transverse liquid guide grooves with different sizes are arranged on the groove core, in the process of fixing the slit flow channel gap, the transverse liquid guide grooves need not be disassembled and replaced when cleaning and replacing the transverse liquid guide grooves, the precision disturbance caused by disassembly and replacement is reduced, and the precision of the slit flow channel is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a structure schematic diagram of a flexible perovskite battery manufacturing easy-to-disassemble and replace coating head according to an embodiment of the present application.

[0020] Figure 2 An exploded view of a flexible perovskite battery manufacturing easy-to-replace coating head according to an embodiment of the present application;

[0021] Figure 3 A cross-sectional view of a flexible perovskite battery manufacturing easy-to-replace coating head according to an embodiment of the present application;

[0022] Figure 4 A slot core structure schematic diagram according to an embodiment of the present application;

[0023] Figure 5 A top view of Figure 1 .

[0024] Reference signs:

[0025] 1 - first hexagonal bolt, 2 - second hexagonal bolt, 3 - front die, 4 - gap adjusting gasket, 5 middle upper die, 6 - slot core, 7 - locking bolt, 8 - rear die, 9 - middle lower die; 401 - slit flow channel, 501 - inlet flow channel, 601 - first slot core longitudinal flow channel, 603 - second slot core longitudinal flow channel, 605 - third slot core longitudinal flow channel, 602 - first slot core transverse liquid guide groove, 604 - second slot core transverse liquid guide groove, 606 - third slot core transverse liquid guide groove. DETAILED DESCRIPTION

[0026] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application will be described in detail below in conjunction with the drawings. In the following description, a lot of specific details are set forth in order to fully understand the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the spirit of the present application, so the present application is not limited to the specific embodiments disclosed below.

[0027] Please refer to Figures 1 to 5 , according to an embodiment of the present application, a flexible perovskite battery manufacturing easy-to-replace coating head, comprising front die 3, adjusting gasket 4, middle die, slot core 6 and rear die arranged from left to right in sequence.

[0028] Specifically, the middle die includes middle upper die 5 and middle lower die 9, adjusting gasket 4 is arranged between front die 3 and middle upper die 5, the middle upper die 5 is provided with an inlet flow channel from the top of the middle upper die 5 to the contact surface of the slot core 6, the middle lower die 9 is provided with an outlet flow channel between the front die 3, the adjusting gasket 4 and the middle die constitute a slit flow channel.

[0029] The groove core 6 is provided with a plurality of flow channel groups in the circumferential direction. In this embodiment, the flow channel groups are three in total, each of which is provided with a transverse liquid guide groove and a longitudinal flow channel. The transverse liquid guide groove is along the axis direction of the groove core 6, and the longitudinal flow channel is along the radial direction of the groove core. The longitudinal flow channel and the transverse liquid guide groove are communicated, and the liquid flows into the longitudinal flow channel and the transverse liquid guide groove from the inlet flow channel 501 and then flows out from the outlet flow channel.

[0030] Further, the groove core 6 is a columnar octahedron including six side surfaces, and the six side surfaces include three circular arc surfaces and three rectangular surfaces, which are arranged at intervals. The three transverse liquid guide grooves are arranged on the three rectangular surfaces respectively. The radius of the transverse liquid guide groove is 1-5 mm, and the length of the transverse liquid guide groove is 100-150 mm.

[0031] Further, the cross section of the transverse liquid guide groove is semicircular, and the three transverse liquid guide grooves are a first groove core transverse liquid guide groove 602, a second groove core transverse liquid guide groove 604 and a third groove core transverse liquid guide groove 606 respectively. The three longitudinal flow channels are a first groove core longitudinal flow channel 601, a second groove core longitudinal flow channel 603 and a third groove core longitudinal flow channel 605 respectively. The diameter of the first transverse liquid guide groove 602 is 2 mm, the diameter of the second transverse liquid guide groove 604 is 3 mm, and the diameter of the third transverse liquid guide groove 606 is 4 mm. According to the viscosity characteristics of different fluids, the size of the transverse flow channel is selected appropriately. If a low-viscosity solution is in a transverse liquid guide groove that is too wide, the solution cannot develop fully due to the influence of gravity, resistance and tension, so that the air in the slit flow channel cannot be completely excluded until the solution reaches the outlet, and the air enters the slit again, which may cause bubbles in the coating layer and uneven distribution of the coating in the transverse direction. Therefore, a narrower transverse liquid guide groove needs to be replaced to ensure that the fluid can develop fully in the transverse liquid guide groove.

[0032] In the embodiment, the front die head 3, the adjusting gasket 4 and the middle die head are connected through four first bolt fasteners, and the front die head 3, the adjusting gasket 4, the middle die head, the slot core 6 and the rear die head are connected through four second bolt fasteners. The second bolt fasteners pass through the through holes in the front die head 3, the adjusting gasket 4 and the middle die head in sequence and are threadedly connected with the threaded holes in the rear die head. When the transverse liquid guide groove needs to be replaced, the entire coating head does not need to be disassembled, only the second threaded fasteners need to be loosened or unscrewed, the slot core 6 is pulled out, the adjusting gasket 4 does not need to be disassembled, the precision disturbance of the slit flow channel is small, then a suitable transverse liquid guide groove is selected, the middle die head is matched, and the coating head is inserted into the coating head. Then the external hexagonal bolt 7 on the slot core 6 is screwed in, and pre-tightening is not needed here. The rear die head 8 is matched with the slot core 6 and the middle die head 5, the second bolt fasteners are used to install the coating head, after the pre-tightening of the external hexagonal bolt 7 is completed, the coating head can be installed on the knife holder and can be used. In cleaning the coating head, the slit flow channel and the liquid guide groove are cleaned by using the same disassembly method, and the gap adjusting gasket does not need to be disassembled.

[0033] The present application is based on the slit coating technology, and proposes an easy-to-disassemble and replaceable coating head for flexible perovskite battery manufacturing, which can realize uniform solution coating on a large area. The coating head can be used in desktop-level equipment and large-area continuous production industrialized equipment, and can realize coating on rigid and flexible substrates.

[0034] The above-described embodiments only express several embodiments of the present application, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present application. It should be noted that, for ordinary skilled persons in the art, without departing from the concept of the present application, several modifications and improvements can be made, which all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. An easily replaceable coating head for manufacturing flexible perovskite solar cells, characterized in that, It includes, from left to right, a front mold head (3), an adjusting shim (4), a middle mold head, a groove core (6), and a rear mold head; The core (6) is provided with several flow channel groups along its circumference. The core (6) is a columnar octahedron with six sides. The six sides include three arc surfaces and three rectangular planes. The arc surfaces and rectangular planes are spaced apart. The flow channel groups are evenly distributed along the circumference of the core (6). Each flow channel group is provided with a transverse liquid guiding groove and a longitudinal flow channel. The transverse liquid guiding groove is along the axial direction of the core (6). The cross-section of the transverse liquid guiding groove is semi-circular. The radii of the transverse liquid guiding grooves are not equal. The three transverse liquid guiding grooves are respectively arranged on three rectangular planes. The longitudinal flow channel is along the radial direction of the core. The longitudinal flow channel and the transverse liquid guiding groove are connected.

2. The easily replaceable coating head for manufacturing flexible perovskite solar cells according to claim 1, characterized in that, The number of flow channel groups is three.

3. The easily replaceable coating head for manufacturing flexible perovskite solar cells according to claim 1, characterized in that, The radii of the three transverse liquid guiding channels increase sequentially.

4. The easily replaceable coating head for manufacturing flexible perovskite solar cells according to claim 1, characterized in that, The middle mold head includes an upper middle mold head (5) and a lower middle mold head (9). The adjusting shim (4) is disposed between the front mold head (3) and the upper middle mold head (5). The upper middle mold head (5) is provided with an inlet flow channel (501) extending from the top of the upper middle mold head (5) to the contact surface of the groove core (6). An outlet flow channel is provided between the lower middle mold head (9) and the front mold head (3). Liquid flows into the longitudinal flow channel and the transverse liquid guide groove through the inlet flow channel (501) and then flows out through the outlet flow channel.

5. The easily replaceable coating head for manufacturing flexible perovskite solar cells according to claim 1, characterized in that, The front mold head (3), the adjusting shim (4) and the middle mold head are connected by a first bolt fastener (1), and the front mold head (3), the adjusting shim (4), the middle mold head, the groove core (6) and the rear mold head are connected by a second bolt fastener (2).

6. The easily replaceable coating head for manufacturing flexible perovskite solar cells according to claim 2, characterized in that, The radius of the transverse liquid guiding channel is 1mm-5mm, and the length of the transverse liquid guiding channel is 100-150mm.

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