Battery piece evaporation device

Abstract

The utility model discloses a battery piece evaporation device, which relates to the technical field of battery piece production, and comprises a shell, a top cover movably connected to the top of the shell, and a vacuumizing assembly connected with the shell, the vacuumizing assembly is used for vacuumizing the interior of the shell, a material to be coated is arranged at the bottom of the top cover, an evaporation mechanism and a partition piece are arranged in the shell, and the partition piece is arranged in the shell. The partition piece divides the interior of the shell into a coating material area and an evaporation generation area, a coating channel communicating the coating material area with the evaporation generation area is formed in the partition piece, materials to be coated are placed in the coating material area, and the faces to be coated of the materials right face the coating channel. The evaporation mechanism can diffuse the plating material target material, the plating material target material is subjected to flying plating to the to-be-coated surface of the to-be-coated material through the coating channel, and the plating material target material sent by the evaporation mechanism is subjected to concentrated flying plating to the coating surface of the to-be-coated battery piece facing the coating channel through the limitation of the coating channel, so that the coating thickness is uniform.

Description

Technical Field

[0001] The utility model relates to the technical field of battery cell production, in particular to a battery cell evaporation device. Background Art

[0002] In the production of solar cells, it is usually necessary to split the cell into two or more pieces. Since the surface recombination rate of the silicon wafer cross-section (side section) formed after the cell is cut is large, it will have a negative impact on the electrical performance of the solar cell. The reduction in solar cell power generation efficiency caused by cutting will directly lead to a reduction in the power of the components made from the sliced ​​cells.

[0003] Passivation coating refers to the formation of a passivation film on the surface of the cell by deposition. By performing passivation coating on the cross section of the silicon wafer on the side of the cell, power loss can be reduced. Generally, magnetron sputtering or electron beam evaporation is used for coating, but the sputtering equipment is complex and requires high vacuum, plasma source and magnetron system, etc., which makes operation and maintenance difficult. Evaporation is heating in a vacuum to evaporate the metal, alloy or compound, which then condenses on the surface to be coated. In the existing technology, most of the semiconductor evaporation is carried out in a sealed vacuum environment. The evaporated gaseous particles have a large divergence space. Due to the different angles and distances between the materials to be coated and the evaporation mechanism in the same space, the thickness of the coating attached to the semiconductor is uneven, which affects the power generation efficiency of the cell. Utility Model Content

[0004] In order to solve the above technical problems, the present invention provides a cell evaporation device for solving the problem of uneven thickness of the existing evaporation coating and improving the quality of the coating layer on the cut surface of the cell.

[0005] The present application proposes a cell evaporation device, comprising: a housing, a top cover movably connected to the top of the housing, and a vacuum assembly connected to the housing, wherein the vacuum assembly is used to vacuum the interior of the housing, and the material to be coated is placed at the bottom of the top cover, wherein:

[0006] The shell is provided with an evaporation mechanism and a partition, the partition divides the volume inside the shell into a coating material area and an evaporation generation area, the partition is provided with a coating channel connecting the coating material area and the evaporation generation area, the material to be coated is placed in the coating material area, and its surface to be coated is opposite to the coating channel, the evaporation mechanism can diffuse the coating target material through the coating channel and fly-plate it to the surface to be coated of the material to be coated.

[0007] Optionally, a plurality of supporting mechanisms are provided on the bottom circumference of the top cover, and a portion of the material to be coated is loaded between two adjacent supporting mechanisms, or a portion of the material to be coated is loaded on each supporting mechanism, and the portion of the material to be coated is formed by stacking several battery cells with their cross-sections facing the same direction.

[0008] Optionally, the top cover includes a cover plate and a turntable rotatably connected to the bottom of the cover plate, and a driving mechanism fixedly connected to the cover plate, the driving end of the driving mechanism is connected to the turntable driving, the supporting mechanism is arranged at the bottom of the cover plate, and the coating channel is provided with a driving mechanism for rotating the material to be coated on the turntable to the top of the coating channel to complete the coating.

[0009] Optionally, a plurality of coating channels are provided on the circumference, and the plurality of coating channels are arranged in one-to-one correspondence with the plurality of materials to be coated on the top cover.

[0010] Optionally, the partition member includes a support plate connected to the shell, and a heat insulation layer and a heating tube provided on the support plate, and the support plate and the heat insulation layer are both provided with the coating channels with the same opening direction.

[0011] Optionally, the coating material area in the shell is further provided with a film thickness detection element and a temperature detection element.

[0012] Optionally, a visual window is further provided on the shell, and the visual window can be opened from the outside.

[0013] Optionally, the shell includes a shell body and a base, the base is sealed and connected to the bottom of the shell body, and the vent hole of the vacuum pumping component is connected to the evaporation occurrence area of ​​the shell body.

[0014] Optionally, a shutter is further provided in the housing, the shutter is rotatably connected to one side of the evaporation mechanism, and a shielding plate provided on the shutter is placed on the top of the evaporation mechanism.

[0015] Optionally, the top cover is further connected to a lifting mechanism, which drives the top cover to move up and down for loading and unloading coating materials.

[0016] The technical solution provided by the present invention uses a partition in the shell to separate the material and the evaporation mechanism into two upper and lower intervals. The material to be coated is placed in the top cover of the coating material area, and only the side of the material to be coated (the cut surface of the battery cell) that needs to be coated is facing downward, so that the coating surface and the coating target material scattering port of the evaporation mechanism are both facing the coating channel on the partition. The gaseous coating target material emitted by the evaporation mechanism is concentrated on the material to be coated on the upper part of the coating channel, so that the vaporized coating target material is concentrated through the coating channel on the partition to the coating surface facing the coating channel, which can make the film thickness of the coating on the cut surface of the battery cell uniform, thereby improving the quality of the battery cell coating. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 This is a schematic structural diagram of the first cell evaporation device proposed in the present invention;

[0019] Figure 2 This is a schematic structural diagram of the second type of cell evaporation device proposed in the present invention;

[0020] Figure 3 This is a cross-sectional view of the internal structure of the cell evaporation device proposed in the present invention;

[0021] Figure 4 This is a schematic diagram of the internal structure of the shell in which one coating channel is provided in the present invention;

[0022] Figure 5 This is a schematic diagram of the internal structure of a shell in which a plurality of coating channels are provided.

[0023] Wherein, the accompanying drawings are marked as follows:

[0024] 100. Material to be coated; 1. Shell; 2. Top cover; 21. Cover plate; 22. Turntable; 23. Driving mechanism; 3. Carrying mechanism; 4. Partition piece; 41. Support plate; 42. Insulation layer; 43. Heating tube; 5. Evaporation mechanism; 6. Vent hole; 7. Film thickness detection element; 8. Temperature detection element; 9. Visual window; 10. Detection mechanism; 11. Shutter; 12. Lifting mechanism. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0026] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0027] After slicing, the cut surface of the cell needs to be plated with a metal oxide film to form a uniform passivation layer on the cut surface to protect the cut surface of the cell from current loss and improve the conversion efficiency of the photovoltaic module.

[0028] The specific plan is as follows:

[0029] Reference Figure 1 、 Figure 2 As shown, a battery cell evaporation device includes: a shell 1, a top cover 2 and a vacuum assembly connected to the shell 1, the vacuum assembly is used to evacuate the interior of the shell 1, and the top of the shell 1 serves as the feed port, the top cover 2 is movably connected to the top of the shell 1, the material to be coated 100 is installed on the bottom of the top cover 2, and the coating surface of the material to be coated 100 (i.e., the cross-section of the battery cell) is facing downward, wherein the partition 4 is placed below the material to be coated 100 and above the evaporation mechanism 5, and divides the internal volume of the shell 1 into a coating material area and an evaporation generation area, the material to be coated 100 is all placed in the coating material area, the partition 4 is provided with a coating channel connecting the coating material area and the evaporation generation area, the coating channel is opposite to the coating surface of the material to be coated 100, so that the coating surface corresponds to the evaporation generation area, the evaporation mechanism 5 can diffuse the coating target material through the coating channel and fly-plate it onto the coating surface of the material to be coated corresponding to the coating channel in the coating material area.

[0030] In this technical solution, a partition 4 is used to isolate the interior space of the evaporation device housing 1, aligning the coating surface of the material to be coated 100 directly with the coating target material dispersal port of the evaporation mechanism 5. Because the gaseous particles of the coating target material emitted by the evaporation mechanism diverge outward in a fan-shaped pattern from near to far in a vacuum environment, the particle density is more concentrated in the area directly opposite the dispersal port. Therefore, the coating target material dispersal port of the evaporation mechanism 5 is aligned with the coating channel, allowing the more concentrated gaseous particles to pass through the coating channel and coat the coating material above it. Because the partition 4 blocks the area outside the coating channel, the gaseous coating target material emitted by the evaporation mechanism 5 is concentrated and adheres to the surface of the coating surface of the cell. Compared to the prior art, the gaseous coating target material emitted by the evaporation mechanism 5 is confined within a fixed range as it passes through the coating channel, avoiding the problem of uneven coating thickness on the cell caused by variations in distance and angle between the coating target material on the evaporation mechanism 5 and the material to be coated 100.

[0031] In some embodiments, a plurality of supporting mechanisms 3 are provided on the circumference of the top cover 2, and a portion of the material to be coated 100 is loaded between two adjacent supporting mechanisms 3, or a portion of the material to be coated 100 is loaded on each supporting mechanism 3, and a portion of the material to be coated 100 is formed by stacking a plurality of battery cells, and the cut surfaces of the stacked multiple battery cells of each portion of the material to be coated 100 are uniformly facing downward, and the cut surfaces are all exposed downward.

[0032] The channel hole on the partition 4 is facing the coating surface of the coating material 100, so that the other parts except the coating surface are blocked above the partition 4, so that the coating target material scattering port of the evaporation mechanism 5 is only facing the coating surface of the coating material, and the emitted coating target material is concentratedly plated onto the coating surface of the battery cell to be plated facing the channel surface through the restriction of the coating channel, and the coating thickness is uniform, instead of the surrounding coating targets all adhering to the coating surface of the battery cell, making the coating thickness of the coating surface of the battery cell uncontrolled, and the coating target material will not fly to other surfaces of the battery cell that do not need to be coated, thereby affecting the coating quality of the battery cell.

[0033] In some embodiments, as Figure 2 、 Figure 3 As shown, the top cover 2 includes a cover plate 21 and a turntable 22 rotatably connected to the bottom of the cover plate 21, and a driving mechanism 23 fixedly connected to the cover plate 21. The driving end of the driving mechanism 23 is drivingly connected to the turntable 22. The supporting mechanism 3 is arranged at the bottom of the turntable 22, wherein the coating channel of the partition member 4 is provided with a driving mechanism 23 for rotating the material to be coated 100 on the turntable 22 in steps to the top of the coating channel to complete the coating.

[0034] Preferably, Figure 4As shown, the evaporation mechanism 5 is arranged directly below the coating channel of the partition 4, and emits a coating target material directly upward, so that the coating target material passes through the upper coating channel and adheres to the coating surface of the coating material, completing the coating of the cross-section of multiple battery cells. Furthermore, when the coating of the material to be coated 100 above the coating channel is completed, the drive mechanism 23 drives the other coating materials on the turntable 22 to rotate to the top of the coating channel to continue coating the next group of battery cells, and so on. After all the multiple portions of the material to be coated 100 on the turntable 22 have been coated, the top cover 2 is opened, the coated materials are all removed, and then new materials to be coated 100 are loaded.

[0035] In some embodiments, as Figure 5 As shown, there are a plurality of coating channels on the partition 4, and the plurality of coating channels correspond one-to-one to the plurality of materials to be coated 100 on the top cover 2, that is, each partition 4 below the material to be coated 100 placed on the top cover 2 is provided with a corresponding coating channel. Preferably, the evaporation mechanism 5 is arranged at the center of the bottom of the shell 1, and emits a coating target material upward. The coating target material is simultaneously coated with the material to be coated 100 through the plurality of coating channels on the partition 4, and the coating of the cut surfaces of multiple groups of battery cells is completed at the same time. Each group of battery cells is composed of multiple battery cells with the same cut surfaces facing the same stack, thereby improving the coating efficiency of the battery cells. The contact conditions between each group of coating targets and the battery cells are limited to the opening size of the coating channel, so that the coating targets only contact the coating surface of the battery cells through the coating channel, and do not gather around the coating surface of the battery cells, so that the coating thickness of the battery cells is uniform.

[0036] In some embodiments, the partition 4 includes a support plate 41 connected to the shell 1, and an insulation layer 42 and a heating tube 43 provided on the support plate 41. The support plate 41 and the insulation layer 42 are both provided with coating channels with the same opening direction. The heating tube 43 is distributed on the upper part of the insulation layer 42. The heating tube 43 heats the inside of the shell 1. The purpose of heating the inside of the shell 1 is to preheat the cavity of the shell 1 in advance, accelerate the evaporation rate of the coating target material by the evaporation mechanism 5, and improve the coating efficiency of the battery cell in the evaporation device; on the other hand, it can heat the coating material, so that the air and moisture inside the coating material are more conducive to being extracted, and no impurities remain inside the shell, thereby accelerating the efficiency of vacuuming the inside of the shell 1.

[0037] Specifically, the plating target material in the present invention may refer to nickel-chromium alloy, aluminum, titanium, tungsten, copper and other materials.

[0038] In some embodiments, a film thickness detection element 7 and a temperature detection element 8 are also provided within the coating material area of ​​the housing 1. The film thickness detection element 7 is placed at a height close to that of the material to be coated 100 and above the coating channel to more accurately measure the coating thickness. The temperature detection element 8 detects the temperature of the internal space environment of the housing 1 and feeds it back to the temperature control system, promptly adjusting the temperature parameters within the housing 1 to ensure that the temperature inside the housing 1 is always constant, thereby ensuring the quality of the cell coating.

[0039] In some embodiments, the housing 1 is further provided with a viewing window 9 that can be opened from the outside. This facilitates manual maintenance of components inside the device through the viewing window 9 and also allows for the addition of target plating material to the evaporation mechanism 5 located near the viewing window 9. When in operation, the viewing window 9 is sealed to the housing 1. Furthermore, the condition of the coating material inside the housing 1 can be observed through the viewing window 9 to check for defects such as the presence of material, any drops, or shutdowns.

[0040] In some embodiments, the shell 1 includes a shell body and a base, the base is sealed and connected to the bottom of the shell body, and the vent 6 of the vacuum assembly is connected to the lower part of the shell body, connecting to the evaporation generating area inside the shell 1. When the evaporation device works, the vacuum assembly vacuums the interior of the shell 1 as a whole, so that the interior of the shell 1 is in a vacuum state as a whole. Then, the evaporation mechanism 5 is started. In a vacuum environment, the evaporation mechanism 5 heats the coating material to vaporize it, and the gaseous particles are rapidly transported to the coating surface at the bottom of the material to be coated 100 in the coating material area in a linear motion with basically no collision.

[0041] Specifically, a shutter 11 is further provided in the housing 1. The shutter 11 is rotatably connected to one side of the evaporation mechanism 5. A shield provided on the shutter 11 is placed on the top of the evaporation mechanism 5. The shield is rotatably connected to the motor. The motor and the evaporation mechanism 5 are both fixedly mounted on the base. The motor rotates to control the shield to block or open the top of the evaporation mechanism 5. The function of the shutter 11 is mainly to control the opening and closing of the evaporation source, thereby accurately controlling the evaporation time and rate of the coating material. By operating the shutter 11, the thickness and quality of the coating can be adjusted to ensure that the uniformity and adhesion of the coating layer meet the standards. In addition, the shutter 11 can also be used to block direct contact between the evaporation source and the substrate during the coating process, avoiding unnecessary contamination and interference, and further improving the quality and purity of the coating.

[0042] In some embodiments, reference Figure 2 As shown, a lifting mechanism 12 is connected to the top cover 2, and the lifting mechanism 12 drives the top cover 2 to move up and down, so that the top cover 2 and the materials installed on the top cover 2 are moved out of the shell 1 together, and cooperate with the external loading and unloading mechanism to load and unload the materials.

[0043] When the carrying mechanism 3 is fixed on the turntable 22, materials are loaded and unloaded from one side of the top cover 2, and the driving mechanism 23 cooperates with the rotation to complete the loading and unloading of materials on the turntable 22 from one side; when the carrying mechanism 3 is fixed on the top cover 2, the lifting mechanism 12 drives the top cover 2 to move upward, and then relies on an external manipulator to load materials from the bottom of the top cover 2 and fix it to the lower part of the top cover 2.

[0044] It should be noted that it is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, from all perspectives, the embodiments should be regarded as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the above description. Therefore, it is intended that all changes that fall within the meaning and range of equivalents of the claims be included in the present invention, and any reference signs in the claims should not be regarded as limiting the claims involved.

[0045] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of the present invention. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims

1. A cell evaporation device, characterized in that: include: A shell (1), a top cover (2) movably connected to the top of the shell (1), and a vacuum pumping assembly connected to the shell (1), wherein the vacuum pumping assembly is used to vacuum the interior of the shell (1), and the material to be coated is installed at the bottom of the top cover (2), wherein: The shell (1) is provided with an evaporation mechanism (5) and a partition (4), the partition (4) divides the volume inside the shell (1) into a coating material area and a evaporation generation area, the partition (4) is provided with a coating channel connecting the coating material area and the evaporation generation area, the material to be coated (100) is placed in the coating material area, and its surface to be coated is opposite to the coating channel, and the evaporation mechanism (5) can diffuse the coating target material through the coating channel to fly-plate it to the surface to be coated of the material to be coated (100).

2. The cell evaporation device according to claim 1, characterized in that: A plurality of supporting mechanisms (3) are provided on the bottom circumference of the top cover (2), and a portion of the material to be coated (100) is loaded between two adjacent supporting mechanisms (3), or a portion of the material to be coated (100) is loaded on each supporting mechanism (3), and the portion of the material to be coated (100) is formed by stacking a plurality of battery cells with their cross-sections facing the same direction.

3. The cell evaporation device according to claim 2, characterized in that: The top cover (2) includes a cover plate (21) and a turntable (22) rotatably connected to the bottom of the cover plate (21), and a driving mechanism (23) fixedly connected to the cover plate (21), wherein the driving end of the driving mechanism (23) is drivingly connected to the turntable (22), a plurality of the supporting mechanisms (3) are arranged at the bottom of the turntable (22), and one of the coating channels is provided, and the driving mechanism (23) is used to rotate the material to be coated (100) on the turntable (22) in steps to the top of the coating channel to complete the coating.

4. The cell evaporation device according to claim 2, characterized in that: A plurality of coating channels are provided, and the coating channels correspond one-to-one to the projection positions of the plurality of materials (100) to be coated on the top cover (2).

5. The cell evaporation device according to claim 1, characterized in that: The partition member (4) comprises a support plate (41) connected to the shell (1), and a heat insulation layer (42) and a heating tube (43) provided on the support plate (41); the support plate (41) and the heat insulation layer (42) are both provided with the coating channels with the same opening direction.

6. The cell evaporation device according to claim 1, characterized in that: The coating material area in the housing (1) is also provided with a film thickness detection element (7) and a temperature detection element (8).

7. The cell evaporation device according to claim 1, characterized in that: The housing (1) is also provided with a visual window (9), which can be opened from the outside.

8. The cell evaporation device according to claim 1, characterized in that: The shell (1) comprises a shell body and a base, the base is sealed and connected to the bottom of the shell body, and the vent hole (6) of the vacuum pumping component is connected to the evaporation generation area of ​​the shell body.

9. The cell evaporation device according to claim 1, characterized in that: A shutter (11) is further provided in the housing (1), and the shutter (11) is rotatably connected to one side of the evaporation mechanism (5), and a shielding plate provided on the shutter (11) is placed on the top of the evaporation mechanism (5).

10. The cell evaporation device according to claim 1, characterized in that: The top cover (2) is also connected to a lifting mechanism (12), and the lifting mechanism (12) drives the top cover (2) to move up and down for loading and unloading coating materials.

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