Device for improving uniformity of battery film and battery film preparation equipment

Abstract

The invention relates to the field of batteries, in particular to a device for improving the uniformity of a battery thin film and battery thin film preparation equipment, and aims to solve the problem of a centralization phenomenon in the preparation process of a battery light absorption layer in related technologies. The device for improving the uniformity of the battery film comprises a driver and a transmission mechanism, wherein the transmission mechanism comprises an output part; the driver is in transmission connection with the transmission mechanism so as to drive the output part to rotate around a vertical axis; the output part is used for being connected with a spin coater, and the vertical axis is parallel to the rotating axis of the spin coater. The battery film preparation equipment comprises a device for improving the uniformity of the battery film. According to the device for improving the uniformity of the battery film, the spin coater can revolve and superpose a centrifugal force besides self-rotation, so that a single motion of a substrate is converted into a compound motion, and therefore, the centralization problem is effectively relieved, and the uniformity of the film is improved.

Description

Technical Field

[0001] The present invention relates to the field of batteries, and in particular to a device for improving the uniformity of a battery film and a battery film preparation device. Background Art

[0002] At present, most laboratories use the solution method (spin coating) to prepare the battery light-absorbing layer, that is, adding solvent to the relevant powders configured in proportion to make a precursor solution, and then evenly coating the solution on the conductive glass on which the charge transfer layer has been prepared. The conductive glass is then adsorbed on the suction cup of the coater, and the anti-solvent is dripped onto the conductive glass through the high-speed rotation of the coater suction cup to complete the preparation of the battery film (light-absorbing layer).

[0003] The working principle of the coating machine is that the motor rotates at high speed to drive the substrate on the suction cup to rotate, and the solution is coated by the rotation of the substrate. However, during the rotation process, the precursor solution will diffuse outward from the center of the substrate due to centrifugal force, resulting in serious centralization of the film, that is, the thickness of the spin-coated film becomes thinner from the center to the outside, resulting in inconsistent photoelectric conversion efficiency at various positions of the battery, thus affecting the overall efficiency. Summary of the invention

[0004] The object of the present invention is to provide a device for improving the uniformity of a battery thin film and a battery thin film preparation device, so as to alleviate the problem of centralization in the preparation process of a battery light-absorbing layer in the related art.

[0005] In order to solve the above technical problems, the technical solution provided by the present invention is: In a first aspect, the present invention provides a device for improving uniformity of a battery film, comprising: a driver and a transmission mechanism, wherein the transmission mechanism comprises an output portion; The driver is in transmission connection with the transmission mechanism to drive the output part to rotate around a vertical axis; The output part is used to be connected to a glue leveling machine, and the vertical axis is parallel to the rotation axis of the glue leveling machine.

[0006] Furthermore, the transmission mechanism includes a frame, a connecting rod, a driving crank and a driven crank; Two ends of the active crank are respectively hinged to one end of the frame and one end of the connecting rod; Two ends of the driven crank are respectively hinged to the other end of the frame and the other end of the connecting rod.

[0007] Furthermore, the transmission mechanism is a parallelogram mechanism.

[0008] Furthermore, the active crank and the driven crank are both telescopic rods.

[0009] Furthermore, the rotation radius of the driven crank is 5-8 cm.

[0010] Furthermore, the transmission mechanism further comprises a dual-bearing assembly, wherein the dual-bearing assembly comprises a dual-bearing bearing seat and two bearings disposed in the dual-bearing bearing seat; The active crank is connected to the frame and the connecting rod through a double bearing assembly; The driven crank is also connected to the frame and the connecting rod through a double bearing assembly.

[0011] Furthermore, the double-bearing bearing seat between the driven crank and the connecting rod is used to fix the glue leveling machine.

[0012] Furthermore, the driver includes a servo motor, and an output shaft of the servo motor is drivingly connected to the active crank.

[0013] In summary of the above technical solutions, the technical effects that can be achieved by a device for improving the uniformity of a battery thin film provided by the present invention are: The device for improving the uniformity of battery film includes a driver and a transmission mechanism, the transmission mechanism includes an output part; the driver is transmission-connected to the transmission mechanism to drive the output part to rotate around a vertical axis; the output part is used to connect to a glue spreader, and the vertical axis is parallel to the rotation axis of the glue spreader.

[0014] In the device for improving the uniformity of the battery film, the driver cooperates with the transmission mechanism to make the glue machine revolve. In specific applications, the glue machine not only rotates on its own, but also revolves, superimposing a centrifugal force to transform the substrate from a single motion into a composite motion, thus effectively alleviating the centralization problem and achieving improvement in the uniformity of the film.

[0015] In a second aspect, the present invention provides a battery thin film preparation device comprising a glue spreader and the above-mentioned device for improving the uniformity of the battery thin film; the glue spreader is arranged at the output part.

[0016] Furthermore, the glue-spinning machine comprises a base, a rotor motor and a film suction table; The base is arranged on the output part; The rotor motor is fixed to the base; The film suction platform is drivingly connected to the output shaft of the rotor motor.

[0017] The beneficial effects of a battery thin film preparation device provided by the present invention are: The battery thin film preparation equipment provided by the present invention includes a device for improving the uniformity of the battery thin film. Therefore, the technical advantages and effects achieved by the battery thin film preparation equipment also include the technical advantages and effects achieved by the above-mentioned device for improving the uniformity of the battery thin film, which will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 A schematic diagram of the structure of a battery thin film preparation device provided in an embodiment of the present invention; Figure 2 This is the photoelectric conversion efficiency table of the comparison group; Figure 3 This is the photoelectric conversion efficiency table of the experimental group; Figure 4 Calculation data table for the experimental group.

[0020] Icon: 100-Drive; 200-transmission mechanism; 210-frame; 220-connecting rod; 230-driving crank; 240-driven crank; 250-double bearing assembly; 300- glue leveling machine; 310- base; 320- rotor motor; 330- film suction table. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0022] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] Some embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0024] During coating, the precursor solution will diffuse outward through the center of the substrate due to centrifugal force, resulting in serious centralization of the film. That is, the thickness of the spin-coated film becomes thinner from the center to the outside, causing the photoelectric conversion efficiency at various positions of the battery to be inconsistent, thus affecting the overall efficiency.

[0025] In view of this, the present invention provides a device for improving the uniformity of battery film, including a driver 100 and a transmission mechanism 200, the transmission mechanism 200 including an output part; the driver 100 is transmission-connected to the transmission mechanism 200 to drive the output part to rotate around a vertical axis; the output part is used to connect to a glue spreader 300, and the vertical axis is parallel to the rotation axis of the glue spreader 300.

[0026] In the device for improving the uniformity of the battery film, the driver 100 cooperates with the transmission mechanism 200 to make the glue spreader 300 revolve. In specific applications, the glue spreader 300 not only rotates itself, but also revolves, superimposing a centrifugal force to transform the substrate from a single motion into a composite motion, thus effectively alleviating the centralization problem and achieving improvement in the uniformity of the film.

[0027] The following combination Figure 1 The structure and shape of a device for improving the uniformity of a battery thin film provided in this embodiment are described in detail: In this embodiment, reference Figure 1 The transmission mechanism 200 includes a frame 210, a connecting rod 220, an active crank 230 and a driven crank 240; both ends of the active crank 230 are respectively hinged to one end of the frame 210 and one end of the connecting rod 220; both ends of the driven crank 240 are respectively hinged to the other end of the frame 210 and the other end of the connecting rod 220.

[0028] Specifically, the driver 100 uses a servo motor, and the output shaft of the servo motor is in transmission connection with the active crank 230. When the servo motor is running, the active crank 230 rotates around the hinge axis between it and the frame 210, and through the transmission of the connecting rod 220, the driven crank 240 rotates synchronously around the hinge axis between it and the frame 210. Here, the driven crank 240 is the output part. With this design, the glue sizing machine 300 is driven and made to revolve.

[0029] Preferably, the transmission mechanism 200 is a parallelogram mechanism. With such a design, the transmission mechanism 200 has no quick return characteristics, can provide stable motion output, ensure the stability of the revolution of the coating machine 300, and thus effectively improve the uniformity of the film during spin coating.

[0030] In accordance with the above, preferably, both the active crank 230 and the driven crank 240 are retractable rods. With such a design, the orbital radius of the glue sizing machine 300 can be changed, and solutions of different viscosities can be matched during spin coating. In addition, the lengths of the frame 210 and the connecting rod 220 are both 40 cm; the rotation radius of the driven crank 240 is 5-8 cm, and optionally, the radius is 5 cm, 7 cm or 8 cm, which is determined according to the actual concentration of the solution.

[0031] For further reference, Figure 1 The transmission mechanism 200 also includes a dual-bearing assembly 250, which includes a dual-bearing bearing seat and two bearings arranged in the dual-bearing bearing seat; the active crank 230 is connected to the frame 210 and the connecting rod 220 through a dual-bearing assembly 250; the driven crank 240 is also connected to the frame 210 and the connecting rod 220 through a dual-bearing assembly 250.

[0032] Specifically, in the parallelogram mechanism, the dual bearing assembly 250 connects and supports two adjacent components, so that the friction between the components can be reduced. Figure 1 The glue leveler 300 is fixed to the double-bearing bearing seat at the upper right corner. It should be added that the double-bearing assembly 250 is an existing structure, and the articulation of two adjacent components through the double-bearing assembly 250 is also an existing technology, which will not be elaborated here.

[0033] The present invention also provides a battery thin film preparation device, referring to Figure 1 The device includes a glue spreader 300 and a device for improving the uniformity of the battery film; the glue spreader 300 includes a base 310, a rotor motor 320 and a film suction table 330; the base 310 is arranged on a double-bearing bearing seat in the upper right corner; the rotor motor 320 is fixed to the base 310; the film suction table 330 is drivingly connected to the output shaft of the rotor motor 320.

[0034] When the servo motor and the glue spreader 300 are in operation, the film suction table 330 rotates and revolves simultaneously through the transmission of the parallelogram mechanism, superimposing a centrifugal force, so that the substrate thereon is converted from a single motion into a compound motion, thereby effectively alleviating the centralization problem and achieving improvement in the uniformity of the film.

[0035] To further illustrate the effect of battery thin film preparation equipment in improving thin film uniformity, a comparison is made between the battery thin film preparation equipment and the traditional spin coating machine (the following S1-S6 steps are the perovskite battery production steps, which are mature processes. Here it is only used to illustrate the position of the spin coating step in the battery production process).

[0036] S1: Cleaning of conductive glass: Cut the laser-etched 2.5 cm*2.5 cm FTO conductive glass into required sizes, use detergent solution, acetone and isopropanol to ultrasonically clean for 30 min respectively, and then place in UV-ozone equipment for treatment for 30 min.

[0037] S2: Preparation of tin dioxide electron transport layer: take 0.5g of commercially available SnO2 slurry, dilute it with 5mL of anhydrous ethanol, and stir it evenly with a magnetic bar to obtain a diluted SnO2 slurry; spin coat 60μL of the diluted SnO2 slurry on a spin coater at a speed of 2500rpm / s for 20s with an acceleration of 500rpm / s; immediately after spin coating, anneal the substrate on a heating table at 105°C for 30min, then slowly heat it to 500°C and anneal it for 20min to remove organic components.

[0038] S3: Preparation of perovskite film layer, dissolve 239mgMAI and 692mgPbI2 in 1.5mL of a mixed solvent of DMSO and DMF to obtain 1.5mL of perovskite precursor solution; treat the substrate obtained in step S2 on a UV-ozone device for 30min, then spin-coat the pre-prepared perovskite precursor solution on the treated substrate in a nitrogen-filled glove box at a speed of 4000rpm / s for 30s; immediately after spin coating, place the perovskite film on a heating table at 100°C and anneal for 10min to obtain a perovskite film.

[0039] S4: Preparation of hole transport layer: 91 mg spiro-OMeTAD was dissolved in 1 mL chlorobenzene, and the additive was 21 µL LiTFSI stock solution (520 mg dissolved in 1 mL acetonitrile), and the additive was added to the spiro-OMeTAD solution to prepare the hole transport layer solution. The above solution was spin-coated onto the surface of the perovskite film at a speed of 4000 rpm / s for 20 s.

[0040] S5: Preparation of metal electrodes: Depositing a 80 nm thick gold electrode on the above-prepared substrate by thermal evaporation to complete the preparation of the perovskite cell.

[0041] S6: Efficiency test, the current-voltage (JV) characteristics were recorded by applying an external potential bias to the assembled cell device, and the generated photocurrent was recorded using a digital source meter (Keithley 2400). The light source used was a 450W xenon lamp equipped with a daylight filter to make the emission spectrum of the lamp conform to the AM1.5G standard.

[0042] The prepared solar cell was tested for efficiency non-uniformity at 25 different points. The non-uniformity calculation formula is: (PCEmax-PCEmin) / (PCEmax+PCEmin)*100%, where PCEmax is the maximum value of the photoelectric conversion efficiency among the 25 points, and PCEmin is the minimum value of the photoelectric conversion efficiency among the 25 points.

[0043] The control group (using traditional glue machine) conducted 3 parallel experiments, and the data are as follows Figure 2 As shown, through calculation, it can be obtained that in experiment 1, the average photoelectric conversion efficiency is 16.25%, and the efficiency non-uniformity is 6.38%; in experiment 2, the average photoelectric conversion efficiency is 15.96%, and the efficiency non-uniformity is 6.13%; in experiment 3, the average photoelectric conversion efficiency is 15.83%, and the efficiency non-uniformity is 7.47%.

[0044] For the experimental group (using battery film preparation equipment), the speed of the servo motor was adjusted, and a total of 6 parallel experiments were conducted. The data are as follows Figure 3 As shown, through calculation, the data of each group is as follows Figure 4 shown.

[0045] From the comparison between the control group and the experimental group, it can be seen that compared with the traditional glue spreader, the average efficiency of the battery cells using the battery thin film preparation equipment is improved and the efficiency non-uniformity is significantly reduced.

[0046] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A device for improving the uniformity of a battery thin film, characterized in that: include: A driver (100) and a transmission mechanism (200), wherein the transmission mechanism (200) comprises an output portion; The driver (100) is in transmission connection with the transmission mechanism (200) to drive the output part to rotate around a vertical axis; The output portion is used to be connected to a glue leveling machine (300), and the vertical axis is parallel to the rotation axis of the glue leveling machine (300); The transmission mechanism (200) comprises a frame (210), a connecting rod (220), a driving crank (230) and a driven crank (240); Two ends of the active crank (230) are respectively hinged to one end of the frame (210) and one end of the connecting rod (220); Two ends of the driven crank (240) are respectively hinged to the other end of the frame (210) and the other end of the connecting rod (220).

2. The device for improving uniformity of battery thin film according to claim 1, characterized in that: The transmission mechanism (200) is a parallelogram mechanism.

3. The device for improving uniformity of battery thin film according to claim 2, characterized in that: The active crank (230) and the driven crank (240) are both telescopic rods.

4. The device for improving uniformity of battery thin film according to claim 3, characterized in that: The rotation radius of the driven crank (240) is 5-8 cm.

5. The device for improving uniformity of battery thin film according to claim 1, characterized in that: The transmission mechanism (200) further comprises a dual-bearing assembly (250), wherein the dual-bearing assembly (250) comprises a dual-bearing bearing seat and two bearings arranged in the dual-bearing bearing seat; The active crank (230) is connected to the frame (210) and the connecting rod (220) via a double bearing assembly (250); The driven crank (240), the frame (210) and the connecting rod (220) are also connected via a double bearing assembly (250).

6. The device for improving uniformity of battery thin film according to claim 5, characterized in that: The dual-bearing bearing seat between the driven crank (240) and the connecting rod (220) is used to fix the glue leveling machine (300).

7. The device for improving uniformity of battery thin film according to claim 1, characterized in that: The driver (100) comprises a servo motor, and an output shaft of the servo motor is drivingly connected to the driving crank (230).

8. A battery thin film preparation device, characterized in that: It comprises a glue spreader (300) and the device for improving the uniformity of a battery thin film according to any one of claims 1 to 7, wherein the glue spreader (300) is arranged at the output part.

9. The battery thin film manufacturing equipment according to claim 8, characterized in that: The glue leveling machine (300) comprises a base (310), a rotor motor (320) and a film suction table (330); The base (310) is arranged on the output part; The rotor motor (320) is fixed to the base (310); The film suction platform (330) is drivingly connected to the output shaft of the rotor motor (320).

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