Laser sintering module and battery piece laser sintering equipment

Abstract

The utility model relates to the technical field of photovoltaic battery piece manufacturing, and particularly discloses a laser sintering module and battery piece laser sintering equipment. The laser sintering module comprises at least two sets of power-up roll shaft assemblies arranged in the front-back direction and a laser assembly used for emitting laser to the position between the two sets of power-up roll shaft assemblies. The power-up roll shaft assembly comprises an upper roll shaft and a lower roll shaft which are oppositely arranged in the vertical direction. Each of the upper roll shaft and the lower roll shaft comprises a main shaft, an insulating layer arranged on the main shaft in a sleeving mode, a conductive layer arranged on the insulating layer in a sleeving mode and a plurality of electrode rings arranged on the conductive layer in a sleeving mode and arranged at intervals. The conductive layer of the upper roller shaft and the conductive layer of the lower roller shaft are electrically connected with the positive electrode and the negative electrode of the power source respectively. According to the utility model, the battery piece can be conveyed while voltage is applied to the battery piece, so that laser emitted by the laser assembly can complete scanning of the whole battery piece, only one group of laser assembly is needed in the whole process, and the manufacturing cost of the equipment is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of photovoltaic cell manufacturing, in particular to a laser sintering module and cell laser sintering equipment. Background Art

[0002] When a reverse voltage is applied to the cell, laser scanning of the gate line of the cell can significantly reduce the contact resistance between the gate line electrode and the silicon wafer, thereby improving the conversion efficiency of the cell.

[0003] In current laser sintering modules, when laser scanning a cell, the cell is stationary. A reverse voltage is applied to the cell via a probe. However, due to obstruction by the probe, the laser assembly cannot fully scan the front surface of the cell at once. Two laser assemblies are required, each scanning half the cell, to fully scan the front surface. This increased number of laser assemblies increases equipment cost and complicates the structure. Utility Model Content

[0004] The purpose of the utility model is to provide a laser sintering module and a cell laser sintering device which can transfer a cell while applying voltage to the cell.

[0005] To achieve the above-mentioned object, the present invention provides a laser sintering module, comprising at least two groups of powered roller assemblies arranged along the front-to-back direction, and a laser assembly for emitting laser light between the two groups of powered roller assemblies;

[0006] The powered roller assembly includes an upper roller and a lower roller arranged opposite to each other in the vertical direction, each of the upper roller and the lower roller includes a main shaft, an insulating layer sleeved on the main shaft, a conductive layer sleeved on the insulating layer, and a plurality of electrode rings sleeved on the conductive layer and arranged at intervals;

[0007] The laser sintering module further includes a power supply, and the conductive layer of the upper roller and the conductive layer of the lower roller are electrically connected to the positive and negative electrodes of the power supply respectively.

[0008] As a further improvement of the present invention, the electrode ring on the upper roller is a first electrode ring, the electrode ring on the lower roller is a second electrode ring, and multiple first electrode rings and multiple second electrode rings are staggered along a transverse direction perpendicular to the front-to-back direction so that the projections of multiple first electrode rings and multiple second electrode rings on a plane perpendicular to the up-down direction do not overlap; the upper roller and the lower roller also include multiple insulating rings sleeved on their conductive layers, the insulating ring on the upper roller is a first insulating ring, and the insulating ring on the lower roller is a second insulating ring, and in the powered roller assembly, multiple first electrode rings and multiple second insulating rings are aligned one by one along the up-down direction, and multiple second electrode rings and multiple first insulating rings are aligned one by one along the up-down direction.

[0009] As a further improvement of the present invention, the outer periphery of the electrode ring and the outer peripheral surface of the insulating ring are both ring-shaped and have a width extending in a transverse direction.

[0010] As a further improvement of the present invention, the electrode ring and the insulating ring are made of flexible material, and the conductive layer is provided with a plurality of slots for defining the positions of the plurality of electrode rings and the plurality of insulating rings.

[0011] As a further improvement of the present invention, the conductive layer includes a plurality of conductive rings sleeved on the insulating layer, the conductive rings are provided with the card slots, and the plurality of conductive rings are arranged separately.

[0012] As a further improvement of the present invention, the material of the electrode ring is one of conductive silicone rubber, conductive sponge, and copper.

[0013] As a further improvement of the present invention, the conductive layer is made of one of copper, graphite, carbon fiber, aluminum, and silver.

[0014] As a further improvement of the present invention, the wavelength of the laser emitted by the laser assembly is 400nm-1200nm, the size of the light spot in the front-to-back direction is 0.01mm-10mm, and the power of the laser assembly is 10W-300W.

[0015] As a further improvement of the present invention, the upper roller and the lower roller each further include a conductive slip ring connected to one end of the main shaft thereof, and the laser sintering module further includes a plurality of first wires and second wires;

[0016] On the upper roller, the conductive layer and the conductive slip ring are electrically connected via the first wire, and the conductive slip ring and the power supply are electrically connected via the second wire; on the lower roller, the conductive layer and the conductive slip ring are electrically connected via the first wire, and the conductive slip ring and the power supply are electrically connected via the second wire.

[0017] The utility model also provides a cell laser sintering device, which includes the above-mentioned laser sintering module.

[0018] Beneficial effects:

[0019] The laser sintering module and cell laser sintering equipment provided by the present invention can convey the cell while applying voltage to the cell, so that the laser emitted by the laser component can complete the scanning of the entire cell. Only one set of laser components is needed for the entire process, thereby reducing the manufacturing cost of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic structural diagram of a laser sintering module provided in one embodiment of the present utility model;

[0021] Figure 2 A side view schematic diagram of a laser sintering module provided in one embodiment of the present utility model;

[0022] Figure 3 A front view schematic diagram of a laser sintering module provided in one embodiment of the present utility model;

[0023] Figure 4 for Figure 3 A schematic front view of the upper or lower roller;

[0024] Figure 5 A schematic top view of a laser sintering module and a solar cell provided in one embodiment of the present invention;

[0025] Figure 6 A schematic front view of an upper roller or a lower roller provided in one embodiment of the present utility model;

[0026] Figure 7 for Figure 6 Schematic diagram of the structure of the conductive ring, electrode ring and insulating ring;

[0027] Figure 8 Another structural schematic diagram of an upper roller or a lower roller provided in one embodiment of the present utility model;

[0028] Figure 9 A schematic diagram of a scanning path on a battery cell provided by an embodiment of the present invention;

[0029] Figure 10 A schematic diagram of a scanning path provided in yet another embodiment of the present invention;

[0030] Figure 11 Press the light spot Figure 9 The scanning path shown is a schematic diagram of the movement trajectory and the scanned area on the battery cell during cyclic scanning;

[0031] Figure 12 The moving track and the scanning area of the battery piece when the light spot is circularly scanned along the scanning path shown in Figure 10 The moving track and the scanning area of the battery piece when the light spot is circularly scanned along the scanning path shown in DETAILED DESCRIPTION

[0032] The utility model will be described in detail below by combining with the embodiment shown in the drawings. But the embodiment does not limit the utility model, and the conversion of the mechanism, method or function made by the person skilled in the art according to the embodiment is included in the protection scope of the utility model.

[0033] The terms for indicating spatial relative position such as "upper", "lower", "left", "right", "front", "back" and the like used herein are for the purpose of convenient description to describe the relationship of one feature relative to another feature as shown in the drawings. It can be understood that the terms for indicating spatial relative position can be intended to include different orientations except the orientation shown in the drawings according to the different product placement positions, and should not be understood as the limitation of the claims. In addition, the description word "horizontal" used herein is not completely equal to along the direction perpendicular to the gravity direction, and a certain angle of inclination is allowed.

[0034] An embodiment of the utility model provides a kind of laser sintering equipment, which is used for laser sintering operation to battery piece 600, it includes laser sintering module 300.

[0035] As shown in Figures 1-5 Laser sintering module 300 includes at least two groups of electrified roller shaft assemblies 302 arranged along front-back direction, and laser assembly 301 for emitting laser between two groups of electrified roller shaft assemblies 302.

[0036] Electrified roller shaft assembly 302 includes upper roller shaft 302a and lower roller shaft 302b oppositely arranged along up-down direction, and upper roller shaft 302a and lower roller shaft 302b are rotated by motor and transmission assembly. When battery piece 600 is arranged between upper roller shaft 302a and lower roller shaft 302b, upper roller shaft 302a and lower roller shaft 302b will drive battery piece 600 to move along front-back direction. The number of electrified roller shaft assembly 302 can be set to four or more.

[0037] The laser assembly 301 includes a laser source 301a, a laser shaping module 301b, a galvanometer 301c, and a field lens 301d. The laser source 301a emits laser light. The laser shaping module 301b shapes the laser spot emitted by the laser source 301a into a square or circular shape. The galvanometer 301c receives the shaped laser light and adjusts the scanning position, amplitude, and speed of the laser spot according to scanning parameters. The field lens 301d is fixedly connected to the galvanometer 301c and focuses the laser light onto the surface of the cell 600, forming a light spot there. The laser spot can be strip-shaped or dot-shaped.

[0038] The powered roller assembly 302 can drive the entire cell 600 to pass through the laser irradiation area, so that the laser can complete the scanning of the entire cell 600.

[0039] In this embodiment, the wavelength of the laser emitted by the laser assembly 301 is 400 nm-1200 nm, the size of the light spot in the front-to-back direction is 0.01 mm-10 mm, and the power of the laser assembly 301 is 10 W-300 W.

[0040] The laser can be a continuous laser or a pulsed laser, which is emitted by a continuous laser or a pulsed laser respectively. In this embodiment, a pulsed laser is preferably used, and the frequency of the laser emitted by the pulsed laser is 50KHZ-4000KHZ. The energy applied to the battery cell 600 by the pulsed laser is moderate.

[0041] Specifically, the upper roller 302a and the lower roller 302b each include a main shaft 3021, an insulating layer 3022 sleeved on the main shaft 3021, a conductive layer 3023 sleeved on the insulating layer 3022, and a plurality of electrode rings 3024 sleeved on the conductive layer 3023 and arranged at intervals. The laser sintering module 300 also includes a power supply 302c. The conductive layer 3023 of the upper roller 302a and the conductive layer 3023 of the lower roller 302b are electrically connected to the positive and negative electrodes of the power supply 302c, respectively. In this way, the plurality of electrode rings 3024 on the upper roller 302a and the plurality of electrode rings 3024 on the lower roller 302b can be electrically connected to the positive and negative electrodes of the power supply 302c, respectively. When the upper roller 302a and the lower roller 302b transport the battery cell 600, the electrode rings 3024 and the battery cell 600 are in contact.

[0042] With the above arrangement, the upper roller 302a and the lower roller 302b apply voltage to the battery cell 600 through the electrode ring 3024, and since an insulating layer 3022 is provided between the conductive layer 3023 and the main shaft 3021, the main shaft 3021 can be made of a metal material with higher strength without being charged.

[0043] The above-mentioned voltage is applied to the battery piece 600, specifically, reverse voltage is applied to the front and back of the battery piece 600, and the voltage value is 10V-30V. In the case of applying reverse voltage, the area of the battery piece 600 irradiated by the laser will generate induced current. When the induced current flows through the area of the battery piece 600 with high resistance, that is, the junction of the grid line electrode and the silicon wafer, a large amount of heat will be generated, sintering the grid line electrode and the silicon wafer, thereby reducing the contact resistance between the grid line electrode and the silicon wafer, and improving the fill factor and conversion efficiency of the battery piece 600.

[0044] In a specific arrangement, the conductive layer 3023 on the upper roller shaft 302a can be electrically connected to the negative electrode of the power supply 302c, and the conductive layer 3023 on the lower roller shaft 302b can be electrically connected to the positive electrode of the power supply 302c. Alternatively, the conductive layer 3023 on the upper roller shaft 302a can be electrically connected to the positive electrode of the power supply 302c, and the conductive layer 3023 on the lower roller shaft 302b can be electrically connected to the negative electrode of the power supply 302c.

[0045] The electrode ring 3024 on the upper roller shaft 302a is a first electrode ring 3024a, and the electrode ring 3024 on the lower roller shaft 302b is a second electrode ring 3024b. In this embodiment, the first electrode ring 3024a and the second electrode ring 3024b are arranged in a transverse direction perpendicular to the front-back direction, so that the projections of the plurality of first electrode rings 3024a and the plurality of second electrode rings 3024b on a plane perpendicular to the up-down direction do not overlap.

[0046] It should be noted that in this paper, the front-back direction is the left-right direction when the laser sintering module 300 is in the state shown in FIG. 1, and the transverse direction is the left-right direction when the laser sintering module 300 is in the state shown in FIG. 1. Figure 2 It should be noted that in this paper, the front-back direction is the left-right direction when the laser sintering module 300 is in the state shown in FIG. 1, and the transverse direction is the left-right direction when the laser sintering module 300 is in the state shown in FIG. 1. Figure 3 It should be noted that in this paper, the front-back direction is the left-right direction when the laser sintering module 300 is in the state shown in FIG. 1, and the transverse direction is the left-right direction when the laser sintering module 300 is in the state shown in FIG. 1.

[0047] The thickness of the battery piece 600 is very small, usually about 100μm. Therefore, in order to contact the battery piece 600, the gap between the first electrode ring 3024a and the second electrode ring 3024b in the up-down direction also needs to be very small, even 0. Arranging the first electrode ring and the second electrode ring 3024b in the transverse direction can avoid short circuiting of the first electrode ring 3024a and the second electrode ring 3024b.

[0048] Further, the upper roller shaft 302a and the lower roller shaft 302b each further include a plurality of insulating rings 3025 sleeved on the conductive layer 3023, wherein the insulating rings 3025 on the upper roller shaft 302a are first insulating rings 3025a, and the insulating rings 3025 on the lower roller shaft 302b are second insulating rings 3025b. In the powered roller shaft assembly 302, the plurality of first electrode rings 3024a and the plurality of second insulating rings 3025b are arranged in one-to-one alignment in the up-down direction, and the plurality of second electrode rings 3024b and the plurality of first insulating rings 3025a are arranged in one-to-one alignment in the up-down direction, that is, in the up-down direction, each first electrode ring 3024a corresponds to a second insulating ring 3025b, and each second electrode ring 3024b corresponds to a first insulating ring 3025a.

[0049] Figures 3-6 In order to distinguish the electrode rings 3024 and the insulating rings 3025, the insulating rings 3025 are marked with section lines.

[0050] The insulating rings 3025 are not conductive and will not cause short circuit when in contact with the electrode rings 3024. When the powered roller shaft assembly 302 is conveying the battery sheet 600, the oppositely arranged electrode rings 3024 and insulating rings 3025 bear against the front and back surfaces of the battery sheet 600, respectively, so that the front and back surfaces of the battery sheet 600 are uniformly stressed, thereby ensuring that the battery sheet 600 will not be damaged. The insulating rings 3025 can be made of insulating rubber or other materials. When the battery sheet 600 is not being conveyed, the electrode rings 3024 and the insulating rings 3025 can be in direct contact.

[0051] When the powered roller shaft assembly 302 is conveying the battery sheet 600, the outer circumferential surface of the electrode ring 3024 and the outer circumferential surface of the insulating ring 3025 are in contact with the battery sheet 600. In the present embodiment, the outer circumferential surface of the electrode ring 3024 and the outer circumferential surface of the insulating ring 3025 are both annular and have a width extending in the lateral direction. In this way, the electrode ring 3024 and the insulating ring 3025 have sufficient contact area to contact the battery sheet 600, so that the battery sheet 600 is not easily crushed, and the electrode ring 3024 also has sufficient area to contact the battery sheet 600 to apply voltage to the battery sheet 600.

[0052] In the lateral direction, the outermost electrode ring 3024 can or can not extend beyond the edge of the battery sheet 600.

[0053] In the present embodiment, the battery sheet 600 is an MBB type battery sheet. This type of battery sheet 600 includes main grid lines and fine grid lines formed into a network structure, wherein the main grid lines (the thick line portion in the battery sheet 600) are consistent with the conveying direction of the battery sheet 600, and the fine grid lines (the thin line portion in the battery sheet 600) are perpendicular to the conveying direction of the battery sheet 600. Figure 5 Figure 5 ​The thin line portion in the cell 600 is perpendicular to the transmission direction of the cell 600. The plurality of electrode rings 3024 respectively contact the plurality of busbars and apply voltage to the thin line through the busbars.

[0054] In this embodiment, a plurality of slots 3023a-1 are provided on the conductive layer 3023 for limiting the positions of the plurality of electrode rings 3024 and the plurality of insulating rings 3025. The plurality of electrode rings 3024 and the plurality of insulating rings 3025 are all held in the slots 3023a-1 so as to be unable to slide in the lateral direction relative to the conductive layer 3023.

[0055] When installing the electrode ring 3024 and the insulating ring 3025, the electrode ring 3024 and the insulating ring 3025 need to be placed one by one on the conductive layer 3023 from the end thereof and driven to slide on the conductive layer 3023 to the corresponding slot 3023a-1. In this case, the electrode ring 3024 and the insulating ring 3025 may need to be driven to slide a considerable distance on the conductive layer 3023 before they are installed in the corresponding slot 3023a-1. For example, when installing the electrode ring 3024 and the insulating ring 3025 located in the middle of the conductive layer 3023, because the installation position is far from the end of the conductive layer 3023, during installation, the electrode ring 3024 and the insulating ring 3025 need to slide a considerable distance on the conductive layer 3023 before they are moved into the slot 3023a-1 located in the middle of the conductive layer 3023.

[0056] The electrode ring 3024 and the insulating ring 3025 are made of flexible material. When they are put on the conductive layer 3023, if they are not in the card slot 3023a-1, the electrode ring 3024 and the insulating ring 3025 are in a stretched state, and the friction between them and the conductive layer 3023 is relatively large. Therefore, the longer the distance the electrode ring 3024 and the insulating ring 3025 need to slide on the conductive layer 3023 during installation, the more inconvenient the installation.

[0057] In this regard, Figures 6-7 As shown, in one embodiment of the present invention, the conductive layer 3023 includes a plurality of conductive rings 3023a sleeved on the insulating layer 3022, and a slot 3023a-1 is defined on the conductive ring 3023a. The plurality of conductive rings 3023a are disposed separately.

[0058] To ensure electrical connection between the multiple separate conductive rings 3023a, the conductive layer 3023 further includes a conductive member that contacts the multiple conductive rings 3023a. With the conductive member, if one conductive ring 3023a in the upper roller 302a or lower roller 302b is connected to the power source 302c, the remaining conductive rings 3023a will also be connected to the power source 302c. The conductive member can be a wire or a thin metal rod that passes through the multiple conductive rings 3023a.

[0059] The conductive ring 3023a can have two retaining grooves 3023a-1, each of which can retain an electrode ring 3024 and an insulating ring 3025. During installation, the electrode ring 3024 and the insulating ring 3025 can be first mounted on the conductive ring 3023a, and then the conductive ring 3023a can be placed on the insulating layer 3022. This facilitates assembly of the electrode ring 3024 and the insulating ring 3025. A screw thread can be used to secure the conductive ring 3023a to the insulating layer 3022 to prevent the conductive ring 3023a from moving laterally on the insulating layer 3022.

[0060] It is conceivable that the number of the slots 3023a-1 on the conductive ring 3023a can be three, four or even more.

[0061] The electrode ring 3024 is made of conductive silicone rubber, conductive sponge, or copper. The electrode ring 3024 is preferably made of conductive silicone rubber, so that the electrode ring 3024 is conductive and flexible, and is not likely to damage the battery cell 600.

[0062] Conductive silicone rubber refers to silicone rubber with conductive particles, such as silver-plated glass, silver-plated aluminum, silver-plated copper, and pure silver, evenly distributed throughout. Depending on the type of particle filling, conductive silicone rubber can be categorized as silver-plated glass conductive silicone rubber, silver-plated aluminum conductive silicone rubber, silver-plated copper conductive silicone rubber, and pure silver conductive silicone rubber. In this embodiment, the electrode ring 3024 is preferably made of silver-plated copper conductive silicone rubber.

[0063] The conductive layer 3023 is made of one of copper, graphite, carbon fiber, aluminum, and silver, so as to have good conductive properties.

[0064] like Figure 8 As shown, the upper roller 302a and the lower roller 302b also include a conductive slip ring 3026 connected to one end of the main shaft 3021 thereof. The laser sintering module 300 also includes a plurality of first wires and second wires (not shown in the figure). On the upper roller 302a, the conductive layer 3023 and the conductive slip ring 3026 are electrically connected via the first wire, and the conductive slip ring 3026 and the power supply 302c are electrically connected via the second wire.

[0065] Similarly, on the lower roller 302b, the conductive layer 3023 and the conductive slip ring 3026 are electrically connected via a first conductive wire, while the conductive slip ring 3026 and the power source 302c are electrically connected via a second conductive wire. The conductive slip ring 3026 is positioned between the power source 302c and the conductive layer 3023 to prevent the wires electrically connecting the conductive layer 3023 and the power source 302c from becoming tangled when the upper and lower rollers 302a, 302b rotate.

[0066] To sum up, the laser sintering module 300 and the cell laser sintering equipment provided by the present invention can transport the cell 600 while applying voltage to the cell 600, and the laser emitted by the laser component 301 can complete the scanning of the entire cell 600. The entire process only requires one set of laser components 600, which reduces the manufacturing cost of the equipment.

[0067] like Figures 9-10 As shown, when using the cell laser sintering equipment provided by the utility model to process the cell, the following steps are included:

[0068] Apply voltage to the battery cell 600 and transport the battery cell 600 from back to front in the front-to-back direction. Figures 9-12 The arrow on the right shows the anterior-posterior direction;

[0069] The laser is emitted toward the cell 600. When the laser is emitted, a point-shaped light spot is formed on the plane where the cell 600 is located. When the light spot is located on the cell 600, a certain area on the cell 600 is illuminated. For example, when the laser is irradiated from top to bottom on the cell 600, a certain area on the upper surface of the cell 600 is illuminated.

[0070] Move the laser so that the light spot performs multiple cycles of scanning along the preset scanning path.

[0071] In the transverse direction perpendicular to the front-back direction, the two sides of the battery cell 600 are respectively the first side and the second side. Figure 9 The middle is the left and right direction, Figure 9 In the embodiment, the left side of the battery cell 600 is the first side, and the right side is the second side. In other embodiments, the right side of the battery cell 600 may be the first side, and the left side may be the second side.

[0072] The scanning path is configured to include a first path S1 that moves from a first point O1 on the first side to a second point O2 on the second side, a second path S2 that moves backward from the second point O2 to a third point O3, and a third path S3 that moves from the third point O3 back to the first side. The scanning path forms a closed loop, with the first point O1 serving as both the starting and ending points of the scanning path. This means that after the illumination point moves along the third path S3 from the second side to the first side, it returns to the first point O1.

[0073] The first path S1 extends obliquely from the rear to the front or is parallel to the transverse direction, and the third path S3 extends obliquely from the rear to the front.

[0074] When the cell 600 is transported from back to front, the light spot moves along the first path S1 from the first point O1 on the first side to the second point O2 on the second side, scanning a portion of the cell 600 and irradiating the scanned area. After passing through the first path S1, the light spot moves from front to back along the second path S2, and then moves from back to front along the third path S3. This prevents the area on the cell 600 scanned by the light spot along the third path S3 from overlapping with the area on the cell 600 previously scanned by the light spot along the first path S1. The light spot can scan as much area on the cell 600 as possible, and the scanning path can ultimately return to the first point O1.

[0075] It should be understood that when the light spot moves along the first path S1 or the third path S3, if the movement of the battery cell 600 from back to front is synchronized with the movement of the light spot from back to front, the area swept by the light spot on the battery cell 600 is parallel to the horizontal direction. If the movement of the battery cell 600 from back to front is not synchronized with the movement of the light spot from back to front, the area swept by the light spot on the battery cell 600 is inclined relative to the horizontal direction.

[0076] like Figure 9 As shown, in one embodiment of the present invention, the third path S3 moves from the third point O3 to the fourth point O4 on the first side of the battery cell 600. The scanning path also includes a fourth path S4 that moves backward from the fourth point O4 to the first point O1. Thus, the scanning path generally presents a figure-8 or hourglass shape, and the light spot cyclically scans along the figure-8 or hourglass-shaped scanning path.

[0077] Specifically, the first path S1 extends obliquely from the back to the front. When the light spot moves along the first path S1, it not only moves in the transverse direction from the first side to the second side, but also moves forward a certain distance in the front-to-back direction. As described above, the third path S3 extends obliquely from the back to the front. When the light spot moves along the third path S3, it not only moves in the transverse direction from the second side to the first side, but also moves forward a certain distance in the front-to-back direction.

[0078] The distance between the first point O1 and the second point O2 in the front-to-back direction, the distance between the third point O3 and the fourth point O4 in the front-to-back direction, and the distance between the second point O2 and the third point O3 in the front-to-back direction are all equal to H. The distance the light spot moves forward when moving along the first path S1 is H, and the distance it moves forward when moving along the third path S3 is also H.

[0079] It can be imagined that, in the above case, the distance between the fourth point O4 and the first point O1 in the front-to-back direction is also equal to H. In the process of the light spot completing one scan, the distance the battery cell 600 moves forward is equal to 2H.

[0080] In the embodiment, the two ends of the first path S1 and the two ends of the third path S3 both exceed the cell sheet 600 in the lateral direction, so that the light spot can completely scan the cell sheet 600 in the lateral direction when moving along the first path S1 and the third path S3. The light spot is scanned in the scanning path for multiple times, and the scanned area can cover the cell sheet 600.

[0081] The length of the first path S1 and the length of the third path S3 are related to the size of the cell sheet 600 in the lateral direction, and the length of the second path S2 (i.e. the distance between the second point O2 and the third point O3 in the front-back direction) and the length of the fourth path S4 (i.e. the distance between the fourth point O4 and the first point O1 in the front-back direction) are related to the size H of the light spot in the front-back direction. For example, in the embodiment, the size of the cell sheet 600 in the lateral direction is 182 mm, the lengths of the first path S1 and the third path S3 are slightly larger than 182 mm, about 190 mm, and the lengths of the second path S2 and the fourth path S4 are both equal to H, 2.5 mm. Obviously, the lengths of the first path S1 and the third path S3 are much larger than the lengths of the second path S2 and the fourth path S4, so that the light spot is used to move along the first path S1 and the third path S3 for most of the time when moving along the scanning path, and the time for moving along the second path S2 and the fourth path S4 can be ignored.

[0082] Specifically, the ratio of the length of the first path or the third path to the size H of the light spot in the front-back direction is not less than 10.

[0083] The lengths of the first path S1 and the third path S3 are equal, and the lengths of the second path S2 and the fourth path S4 are also equal. If the cell sheet 600 moves forward at a constant speed, the distance 2H that the cell sheet 600 moves forward during the light spot completes a scanning process can be divided into: the cell sheet 600 moves forward by a distance H when the light spot moves from the first point O1 to the second point O2 along the first path S1, and the cell sheet 600 moves forward by a distance H when the light spot moves from the third point O3 to the fourth point O4 along the third path S3. Since the light spot moves forward by a distance H when moving along the first path S1 and moves forward by a distance H when moving along the third path S3, the cell sheet 600 moves synchronously with the light spot when the light spot moves along the first path S1 and the third path S3. Thus, when the light spot is scanned in the scanning path for multiple times, a plurality of strip-shaped areas scanned by the light spot on the cell sheet 600 are parallel to the lateral direction and cover the cell sheet 600, and the light spot can basically scan all the areas of the cell sheet 600. Figure 11 A schematic diagram of the moving track of the light spot on the cell sheet 600 and the scanned area when the light spot is scanned in the scanning path of the embodiment.

[0084] It can be understood that the distance between the first point O1 and the second point O2 in the front-to-back direction, the distance between the third point O3 and the fourth point O4 in the front-to-back direction, and the distance between the second point O2 and the third point O3 in the front-to-back direction may also be slightly larger or slightly smaller than the size H of the light spot in the front-to-back direction.

[0085] The relationship between the beam spot's speed and the forward movement speed of the cell 600 is illustrated below. Assume the beam spot is a 2.5mm*2.5mm rectangular laser spot, with a front-to-back dimension H = 2.5mm. The lateral distance between the first and second points O1 and O2, as well as the lateral upward distance between the third and fourth points O3 and O4, are both 190mm. The lengths of the first and third paths S1 and S3 are both approximately 190mm, and the lengths of the second and fourth paths S2 and S4 are both 2.5mm. Thus, the total scanning path length is approximately 190mm*2+2.5*2=385mm. Assuming the cell 600's transmission speed is 300mm / s, and the time required for it to move forward a distance of 2H is 5mm ÷ 300mm / s = 0.017s, the beam spot's speed should be 385mm ÷ 0.017 = 22647mm / s. In summary, if the transmission speed of the cell 600 is 300 mm / s, the moving speed of the light spot should be 22647 mm / s. In this way, the area scanned by the light spot can basically cover the cell 600. If the transmission speed of the cell 600 is faster than 300 mm / s, some areas on the cell 600 will not be scanned, resulting in missed scans. Conversely, some areas on the cell 600 will be scanned repeatedly.

[0086] It is conceivable that in some scenarios, the moving speed of the light spot or the forward transmission speed of the battery cell 600 can be adjusted to meet special needs of missed scanning or repeated scanning.

[0087] In another embodiment of the present invention, Figure 10 As shown, this embodiment differs from the previous one in that, in this embodiment, the first path S1 is parallel to the transverse direction, meaning that the distance between the first point O1 and the second point O2 in the front-to-back direction is zero. The light spot moves along the first path S1, transversely from the first side to the second side, but its position in the front-to-back direction remains unchanged. The distance between the third point O3 and the fourth point O4 in the front-to-back direction is 2H. The light spot moves along the third path S3, not only from the second side to the first side but also from back to front by a distance of 2H. As can be expected, in this case, the distance between the fourth point O4 and the first point O1 in the front-to-back direction, i.e., the length of the fourth path S4, is equal to H.

[0088] In this embodiment, the length of the third path S3 is slightly greater than that of the first path S1, and the lengths of the second path S2 and the fourth path S4 are equal. If the cell 600 moves forward at a constant speed, the distance 2H that the cell 600 moves forward during one scan of the light spot can be divided into: when the light spot moves from the first point O1 to the second point O2 along the first path S1, the cell 600 moves forward by a distance H; when the light spot moves from the third point O3 to the fourth point O4 along the third path S3, the cell 600 moves forward by a distance H. Because the light spot moves forward by a distance of 0 when moving along the first path S1, the cell 600 and the light spot move asynchronously, with a difference in distance H between the two. Accordingly, the stripe area scanned by the light spot on the cell 600 extends obliquely from front to back relative to the horizontal direction. Since the light spot moves forward a distance of 2H when moving along the third path S3, the movement of the battery cell 600 and the light spot is also out of sync, and the distance between the two is also H. Accordingly, the strip area swept by the light spot on the battery cell 600 extends obliquely from the back to the front relative to the horizontal direction. Figure 12 Schematic diagram of the movement trajectory and the scanned area of ​​the light spot on the solar cell 600 when the light spot scans according to the scanning path of this embodiment.

[0089] When the light spot is scanned cyclically according to the scanning path of this embodiment, the strip area swept on the battery when moving along the first path S1 and the strip area swept on the battery cell 600 when moving along the third path S3 are parallel and cover the battery cell 600, and the light spot can basically scan the entire area of ​​the battery cell 600.

[0090] In summary, the present invention applies voltage to the battery cell 600 during the transportation of the battery cell 600, and during the transportation of the battery cell 600, a laser with a point-shaped light spot is used to move according to a preset scanning path. The area scanned by the laser can well cover the battery cell 600, and the energy applied to the battery cell 600 is moderate.

[0091] It should be understood that although this specification is described according to embodiments, not every embodiment contains only one independent technical solution. This narrative style of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0092] The above embodiments are only used to illustrate the technical solutions of the present application and are not intended to limit the present application. Although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present application.

Claims

1. A laser sintering module, characterized in that: It comprises at least two groups of powered roller assemblies arranged in a front-to-rear direction, and a laser assembly for emitting laser light between the two groups of powered roller assemblies; The powered roller assembly includes an upper roller and a lower roller arranged opposite to each other in the vertical direction, each of the upper roller and the lower roller includes a main shaft, an insulating layer sleeved on the main shaft, a conductive layer sleeved on the insulating layer, and a plurality of electrode rings sleeved on the conductive layer and arranged at intervals; The laser sintering module further includes a power supply, and the conductive layer of the upper roller and the conductive layer of the lower roller are electrically connected to the positive and negative electrodes of the power supply respectively.

2. The laser sintering module according to claim 1, characterized in that: The electrode ring on the upper roller is a first electrode ring, and the electrode ring on the lower roller is a second electrode ring. Multiple first electrode rings and multiple second electrode rings are staggered along a transverse direction perpendicular to the front-to-back direction so that the projections of multiple first electrode rings and multiple second electrode rings on a plane perpendicular to the up-down direction do not overlap; the upper roller and the lower roller also include multiple insulating rings sleeved on their conductive layers, the insulating ring on the upper roller is a first insulating ring, and the insulating ring on the lower roller is a second insulating ring. In the powered roller assembly, multiple first electrode rings and multiple second insulating rings are aligned one by one along the up-down direction, and multiple second electrode rings and multiple first insulating rings are aligned one by one along the up-down direction.

3. The laser sintering module according to claim 2, characterized in that: The outer periphery of the electrode ring and the outer peripheral surface of the insulating ring are both ring-shaped and have a width extending in a transverse direction.

4. The laser sintering module according to claim 3, characterized in that: The electrode ring and the insulating ring are made of flexible material, and the conductive layer is provided with a plurality of slots for defining the positions of the plurality of electrode rings and the plurality of insulating rings.

5. The laser sintering module according to claim 4, characterized in that: The conductive layer includes a plurality of conductive rings sleeved on the insulating layer, the conductive rings are provided with the clamping grooves, and the plurality of conductive rings are arranged separately.

6. The laser sintering module according to claim 1, characterized in that: The electrode ring is made of one of conductive silicone rubber, conductive sponge and copper.

7. The laser sintering module according to claim 1, characterized in that: The conductive layer is made of one of copper, graphite, carbon fiber, aluminum and silver.

8. The laser sintering module according to claim 1, characterized in that: The wavelength of the laser emitted by the laser assembly is 400nm-1200nm, the size of the light spot in the front-back direction is 0.01mm-10mm, and the power of the laser assembly is 10W-300W.

9. The laser sintering module according to claim 1, characterized in that: The upper roller and the lower roller each further include a conductive slip ring connected to one end of the main shaft thereof, and the laser sintering module further includes a plurality of first wires and a second wire; On the upper roller, the conductive layer and the conductive slip ring are electrically connected via the first wire, and the conductive slip ring and the power supply are electrically connected via the second wire; on the lower roller, the conductive layer and the conductive slip ring are electrically connected via the first wire, and the conductive slip ring and the power supply are electrically connected via the second wire.

10. A cell laser sintering device, characterized in that: The laser sintering module comprises the laser sintering module according to any one of claims 1 to 9.

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