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 a power-up roll shaft assembly and a laser assembly; 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 rotating shaft and a contact ring which sleeves the rotating shaft and is used for being in contact with a battery piece, the contact ring on the upper roll shaft is a first contact ring, and the contact ring on the lower roll shaft is a second contact ring; the laser sintering module further comprises a power source, at least one of all the first contact rings is electrically connected with one of the positive electrode and the negative electrode of the power source, and at least one of all the second contact rings is electrically connected with the other one of the positive electrode and the negative electrode of the power source. 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 in a front-to-rear direction, and a laser assembly for emitting laser light between the two groups of powered roller assemblies;

[0006] The power roller assembly includes an upper roller and a lower roller arranged opposite to each other in the vertical direction. The upper roller and the lower roller each include a rotating shaft and a contact ring sleeved on the rotating shaft for contacting the battery cell. Each upper roller and each lower roller is only provided with one contact ring. The contact ring on the upper roller is a first contact ring, and the contact ring on the lower roller is a second contact ring.

[0007] The laser sintering module further includes a power supply, at least one of all the first contact rings is electrically connected to one of the positive and negative poles of the power supply, and at least one of all the second contact rings is electrically connected to the other of the positive and negative poles of the power supply.

[0008] As a further improvement of the present invention, all first contact rings are used to electrically connect one of the positive and negative poles of the power supply, and all second contact rings are used to electrically connect the other of the positive and negative poles of the power supply. The laser sintering module also includes a plurality of switching elements, and the switching element is arranged between at least one of the first and second contact rings that are opposite to each other and the power supply.

[0009] As a further improvement of the present invention, the laser sintering module also includes a sensing element, which is arranged between the first group of powered roller assemblies and the second group of powered roller assemblies from back to front, so as to determine whether there are battery cells between the first group of powered roller assemblies and the second group of powered roller assemblies.

[0010] As a further improvement of the present invention, the lengths of the first contact ring and the second contact ring, which are opposite to each other, are different, wherein the upper roller shaft or the lower roller shaft where the shorter contact ring is located is provided with two insulating sleeves respectively located on both sides of the contact ring;

[0011] Among the upper roller and the lower roller, the one with the longer contact ring is the first roller, and the one with the shorter contact ring is the second roller. Among all the upper rollers, at least one is the first roller, and among all the lower rollers, at least one is the first roller.

[0012] As a further improvement of the present invention, the length of the shorter contact ring plus the length of the two insulating sleeves is equal to the length of the longer contact ring.

[0013] As a further improvement of the present invention, the powered roller shaft assembly is provided with four groups along the front-to-back direction and is evenly arranged. Among the four upper roller shafts from the back to the front, the first upper roller shaft and the fourth upper roller shaft are the second roller shafts, the second upper roller shaft and the third upper roller shaft are the first roller shafts, and among the four lower roller shafts from the back to the front, the first lower roller shaft and the fourth lower roller shaft are the first roller shafts, and the second lower roller shaft and the third lower roller shaft are the second roller shafts;

[0014] The laser assembly is used for emitting laser light between the second upper roller and the third upper roller.

[0015] As a further improvement of the present invention, only one of the first contact ring and the second contact ring that are opposite to each other is electrically connected to the positive electrode or the negative electrode of the power supply.

[0016] As a further improvement of the present invention, the powered roller shaft assembly is provided with four groups along the front-to-back direction and is evenly arranged. Among the four first contact rings and the four second contact rings from back to front, the second first contact ring and the third first contact ring are electrically connected to one of the positive and negative poles of the power supply, and the first second contact ring and the fourth second contact ring are electrically connected to the other of the positive and negative poles of the power supply;

[0017] The laser assembly is used for emitting laser light between the second upper roller and the third upper roller.

[0018] As a further improvement of the present invention, the rotating shaft includes a main shaft, an insulating layer sleeved on the main shaft, and a conductive layer sleeved on the insulating layer. The contact ring is sleeved on the conductive layer. At least one of the conductive layers of all upper rollers is electrically connected to one of the positive and negative poles of the power supply, and at least one of the conductive layers of all lower rollers is electrically connected to the other of the positive and negative poles of the power supply.

[0019] The utility model also provides a cell laser sintering device, which includes the above-mentioned laser sintering module.

[0020] Beneficial effects:

[0021] 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

[0022] Figure 1 A schematic structural diagram of a laser sintering module provided for an embodiment of the present invention;

[0023] Figure 2 A front view of a laser sintering module provided in one embodiment of the present utility model;

[0024] Figure 3 for Figure 2 A front view of the upper roller or lower roller;

[0025] Figure 4 for Figure 2 Side view of the laser sintering module in the;

[0026] Figure 5 for Figure 2 Schematic diagram of the circuit structure of the laser sintering module;

[0027] Figure 6 for Figure 2 A top view of the upper roller and solar cells of the laser sintering module;

[0028] Figure 7 A front view of a laser sintering module provided in yet another embodiment of the present invention;

[0029] Figure 8 for Figure 7 Side view of the laser sintering module in the;

[0030] Figure 9 Figure 7 Schematic diagram of the circuit structure of the laser sintering module;

[0031] Figure 10 for Figure 7 A top view of the upper roller and solar cells of the laser sintering module;

[0032] Figure 11 A front view of a laser sintering module provided in yet another embodiment of the present invention;

[0033] Figure 12 for Figure 11 Side view of the laser sintering module in the;

[0034] Figure 13 for Figure 11 Schematic diagram of the circuit structure of the laser sintering module;

[0035] Figure 14 for Figure 11 A top view of the upper roller and solar cells of the laser sintering module;

[0036] Figure 15 This is a top view of the upper roller and solar cells in a laser sintering module in another embodiment of the present invention;

[0037] Figure 16 A side view of a laser sintering module provided in yet another embodiment of the present invention;

[0038] Figure 17 for Figure 16 Schematic diagram of the circuit structure of the laser sintering module;

[0039] Figure 18 A schematic diagram of a scanning path on a battery cell provided by an embodiment of the present invention;

[0040] Figure 19 A schematic diagram of a scanning path provided in yet another embodiment of the present invention;

[0041] Figure 20 Press the light spot Figure 18 The scanning path shown is a schematic diagram of the movement trajectory and the scanned area on the battery cell during cyclic scanning;

[0042] Figure 21 Press the light spot Figure 20 The scanning path shown is a schematic diagram of the movement trajectory and the scanned area on the battery cell during cyclic scanning. DETAILED DESCRIPTION

[0043] The present invention will be described in detail below with reference to the embodiments shown in the accompanying drawings. However, this embodiment does not limit the present invention, and any modifications to the mechanism, method, or function made by a person skilled in the art based on this embodiment are all within the scope of protection of the present invention.

[0044] Terms used herein to denote relative spatial positions, such as "upper," "lower," "left," "right," "front," and "back," are used for ease of explanation to describe the relationship of one feature relative to another, as shown in the accompanying drawings. It should be understood that, depending on the placement of the product, these terms may be intended to encompass orientations other than those depicted in the drawings and should not be construed as limitations on the claims. Furthermore, the descriptor "horizontal" as used herein does not necessarily mean perpendicular to gravity, although a certain degree of tilt is permitted.

[0045] This embodiment provides a laser sintering device, which is used to perform laser sintering operations on a cell 600 and includes a laser sintering module 300 .

[0046] like Figure 1-17 As shown, the laser sintering module 300 includes at least two groups of powered roller assemblies 302 arranged along the front-to-back direction, and a laser assembly 301 for emitting laser light between the two groups of powered roller assemblies 302 .

[0047] The power roller assembly 302 includes an upper roller 302a and a lower roller 302b, which are arranged in a vertically opposed relationship. The upper roller 302a and the lower roller 302b are driven to rotate by a transmission assembly (not shown). When a battery cell 600 is positioned between the upper roller 302a and the lower roller 302b, the upper roller 302a and the lower roller 302b drive the battery cell 600 to move forward and backward.

[0048] 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.

[0049] 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.

[0050] In this embodiment, the wavelength of the laser emitted by the laser assembly 301 is 400nm-1200nm, the size of the laser spot in the front-to-back direction is 0.01mm-10mm, and the power of the laser assembly 301 is 10W-300W.

[0051] 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.

[0052] Specifically, the upper roller 302a and the lower roller 302b each include a rotating shaft 3020 and a contact ring 3024 mounted on the rotating shaft 3020 for contacting the battery cell 600. Each upper roller 302a and each lower roller 302b has only one contact ring 3024. The contact ring 3024 on the upper roller 302a is a first contact ring 3024a, and the contact ring 3024 on the lower roller 302b is a second contact ring 3024b. On the battery cell 600, the first contact ring 3024a contacts the front surface, while the second contact ring 3024b contacts the back surface. The outer circumference of the contact ring 3024 is annular and has a width extending in a transverse direction perpendicular to the front-to-back direction. In this way, the contact ring 3024 has a sufficient contact area to contact the battery cell 600 , so that the battery cell 600 is not easily crushed. In addition, the contact ring 3024 also has a sufficient contact area to contact the battery cell 600 to apply voltage to the battery cell 600 .

[0053] It should be noted that, in this article, the front-to-back direction refers to the direction in which the laser sintering module 300 is located. Figure 4 The left and right directions in the state shown are as follows: the left side is the rear side, the right side is the front side, and the transverse direction is the direction in which the laser sintering module 300 is in the state shown. Figure 2 Left and right direction in the shown state.

[0054] The laser sintering module 300 also includes a power supply 302c. At least one of all the first contact rings 3024a is electrically connected to one of the positive and negative poles of the power supply 302c, and at least one of all the second contact rings 3024b is electrically connected to the other of the positive and negative poles of the power supply 302c. In this way, when the powered roller assembly 302 conveys the battery cell 600, the power supply 302c can apply voltage to the battery cell 600 through at least one first contact ring 3024a and at least one second contact ring 3024b.

[0055] The aforementioned application of voltage to the cell 600 specifically involves applying a reverse voltage to both the front and back surfaces of the cell 600, with a voltage value of 10V to 30V. When the reverse voltage is applied, an induced current is generated in the area of ​​the cell 600 irradiated by the laser. When the induced current flows through the area of ​​the cell 600 with relatively high resistance, namely, the junction between the gate electrode and the silicon wafer, a large amount of heat is generated, sintering the gate electrode and the silicon wafer, thereby reducing the contact resistance between the gate electrode and the silicon wafer and improving the fill factor and conversion efficiency of the cell 600.

[0056] In a specific configuration, the negative pole of the power supply 302c is electrically connected to the first contact ring 3024a, and the positive pole is electrically connected to the second contact ring 3024b, or the positive pole of the power supply 302c is electrically connected to the first contact ring 3024a, and the negative pole is electrically connected to the second contact ring 3024b.

[0057] The rotating shaft 3020 includes a main shaft 3021, an insulating layer 3022 sleeved on the main shaft 3021, and a conductive layer 3023 sleeved on the insulating layer 3022. The contact ring 3024 sleeved on the conductive layer 3023. The power source 302c is connected to the contact ring 3024 through the conductive layer 3023. At least one of the conductive layers 3023 on all upper rollers 302a is electrically connected to one of the positive and negative poles of the power source 302c, and at least one of the conductive layers 3023 on all lower rollers 302b is electrically connected to the other of the positive and negative poles of the power source 302c. The main shaft 3021 is a metal shaft with high structural strength. The insulating layer 3022 separates the main shaft 3021 and the conductive layer 3023, preventing the main shaft 3021 from becoming electrically charged.

[0058] The insulating layer 3022 may be made of insulating rubber, the conductive layer 3023 may be made of copper, graphite, carbon fiber, aluminum, silver, etc., and the contact ring 3024 may be made of conductive silicone rubber, copper, carbon fiber, etc. Conductive silicone rubber is preferably used, as it is conductive and flexible, so it is not easy to damage the battery cell 600.

[0059] 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, contact ring 3024 is preferably made of silver-plated copper conductive silicone rubber.

[0060] The thickness of the battery cell 600 is extremely small, typically around 100 μm. Therefore, to ensure contact with the battery cell 600, the gap between the first and second contact rings 3024 a and 3024 b must be minimized, allowing for direct contact between the first and second contact rings 3024 a and 3024 b. This prevents short circuits between the first and second contact rings 3024 a and 3024 b, which are facing each other, during the design.

[0061] like Figure 2-6As shown, in one embodiment of the present invention, all first contact rings 3024a are used to electrically connect to one of the positive and negative poles of the power source 302c, and all second contact rings 3024b are used to electrically connect to the other of the positive and negative poles of the power source 302c. In a specific configuration, all first contact rings 3024a can be used to electrically connect to the negative pole of the power source 302c, and all second contact rings 3024b can be used to electrically connect to the positive pole of the power source 302c. Alternatively, all first contact rings 3024a can be used to electrically connect to the positive pole of the power source 302c, and all second contact rings 3024b can be used to electrically connect to the negative pole of the power source 302c.

[0062] The laser sintering module 300 also includes a plurality of switch elements 302d, each provided between at least one of the first and second contact rings 3024a, 3024b, which are positioned vertically opposite one another, and the power source 302c. The switch elements 302d control the connection between at least one of the first and second contact rings 3024a, 3024b and the power source 302c, thereby preventing a short circuit between the first and second contact rings 3024a, 3024b.

[0063] The switch element 302d may be provided between the second contact ring 3024b and the power source 302c, or between the first contact ring 3024a and the power source 302c, or between both the first contact ring 3024a and the power source 302c and the second contact ring 3024b and the power source 302c.

[0064] When the power roller assembly 302 is conveying a battery cell 600, if a battery cell 600 is located between the first and second contact rings 3024a, 3024b, which are positioned vertically opposite each other, the switch element 302d is closed. At this point, both the first and second contact rings 3024a, 3024b are electrically connected to the power source 302c, allowing the first and second contact rings 3024a, 3024b to apply voltage to the battery cell 600. If no battery cell 600 is located between the first and second contact rings 3024a, 3024b, the switch element 302d is open. At this point, at least one of the first and second contact rings 3024a, 3024b is disconnected from the power source 302c, and no short circuit will occur if the two contact each other.

[0065] The switch element 302d is preferably a solid-state relay. The laser sintering module 300 may further include a control unit (such as a PLC) electrically connected to the solid-state relay. The control unit controls the on-off between the contact ring 3024 and the power supply 302c through the solid-state relay.

[0066] Furthermore, the laser sintering module 300 also includes a sensing element 302e, which is arranged between the first group of powered roller assemblies 302 and the second group of powered roller assemblies 302 from back to front, so as to determine whether there is a battery cell 600 between the first group of powered roller assemblies 302 and the second group of powered roller assemblies 302.

[0067] The sensing element 302e is electrically connected to the control unit. When the sensing element 302e senses a battery cell 600, the first contact ring 3024a and the second contact ring 3024b of the first power roller assembly 302 are both connected to the power source 302c. The control unit can subsequently calculate the position of the battery cell 600 at each subsequent moment based on the transmission speed of the battery cell 600, the size of the battery cell 600, and the distance between the power roller assembly 302 in the front-to-back direction. This ensures that both the first and second contact rings 3024a, 3024b, which are located vertically opposite each other, are electrically connected to the power source 302c only when a battery cell 600 is located between them. When the battery cell 600 is about to leave the space between the first and second contact rings 3024a, 3024b, the electrical connection between at least one of the first and second contact rings 3024a, 3024b and the power source 302c is disconnected. This prevents a short circuit between the first and second contact rings 3024a, 3024b.

[0068] The sensing element 302e is not limited to being disposed between the first group of powered roller components 302 and the second group of powered roller components 302 from back to front, but may also be disposed behind the first group of powered roller components 302 from back to front.

[0069] In this embodiment, the cell 600 is an MBB type cell. This cell 600 includes main grid lines and fine grid lines forming a network structure, wherein the extension direction of the main grid lines ( Figure 6 The thick line part in the cell 600) is consistent with the transmission direction of the cell 600, and the thin grid line ( Figure 6 The thin line portion in the battery cell 600 extends in the lateral direction.

[0070] In this embodiment, the contact rings 3024 on the upper roller 302a and the lower roller 302b can apply voltage to the fine grid lines by contacting multiple busbars. In this case, the length of the contact rings 3024 (i.e., the dimension of the contact rings 3024 in the lateral direction) is smaller than the lateral dimension of the cell 600.

[0071] like Figure 7-10As shown, in another embodiment of the present invention, the lengths of the first contact ring 3024a and the second contact ring 3024b opposite to each other are different, one is longer and the other is shorter, and the upper roller shaft 302a or the lower roller shaft 302b where the shorter contact ring 3024 is located is provided with two insulating sleeves 3024c located on both sides of its contact ring 3024.

[0072] For ease of explanation, the longer contact ring 3024 is referred to as the long contact ring, and the shorter contact ring 3024 is referred to as the short contact ring. The long contact ring is longer than the lateral dimension of the cell 600, and both ends of its length extend beyond the edge of the cell 600. The short contact ring is shorter than the lateral dimension of the cell 600, and both ends of its length extend within the edge of the cell 600. The length of the long contact ring is equal to the length of the short contact ring plus the length of the two insulating sleeves 3024c.

[0073] For example, if the horizontal dimension of the battery cell 600 is 182 mm, the length of the long contact ring needs to be greater than 182 mm, preferably 186 mm, the length of the short contact ring needs to be less than 182 mm, preferably 170 mm, and the length of the insulating sleeves 3024 c on both sides is 8 mm.

[0074] To facilitate distinction, Figure 7-10 In the figure, portions of the insulating sleeve 3024c are hatched.

[0075] The laser powered roller assembly 302 of this embodiment is suitable for applying voltage to 0BB type battery cells. Figure 10 As shown, the difference between this type of battery cell 600 and the above-mentioned MBB type battery cell is that the 0BB type battery cell has no main grid but only fine grids. When voltage is applied to it, the contact ring 3024 needs to contact all the fine grids. Therefore, the length of the contact ring 3024 needs to be greater than the size of the battery cell 600 in the lateral direction.

[0076] It can be imagined that the laser powered roller assembly 302 of this embodiment is suitable for applying voltage to 0BB type battery cells, and is also suitable for applying voltage to MBB type battery cells.

[0077] In this embodiment, among the long contact ring and the short contact ring relative to each other, the length of the long contact ring is greater than the size of the battery cell 600 in the lateral direction, and it can contact all the fine grid lines, while the length of the short contact ring is less than the size of the battery cell 600 in the lateral direction. The part of the long contact ring that exceeds the battery cell 600 contacts the insulating sleeve 3024c, so that no short circuit will occur between the upper roller 302a and the lower roller 302b.

[0078] Among the upper rollers 302a and the lower rollers 302b, the one with the longer contact ring 3024 is the first roller 302-L, and the one with the shorter contact ring 3024 is the second roller 302-S. In order to ensure that all the fine grid lines on both sides of the battery cell 600 can contact the contact ring 3024, at least one of all the upper rollers 302a is the first roller 302-L, and at least one of all the lower rollers 302b is the first roller 302-L.

[0079] In this embodiment, four groups of power roller assemblies 302 are evenly spaced along the front-to-back direction. From back to front, the four upper rollers 302a and four lower rollers 302b are arranged as follows: the first and fourth upper rollers 302a constitute the second rollers 302-S, the second and third upper rollers 302a constitute the first rollers 302-L, the first and fourth lower rollers 302b constitute the first rollers 302-L, and the second and third lower rollers 302b constitute the second rollers 302-S. The laser assembly 301 is configured to emit laser light between the second and third upper rollers 302a, 302a, to illuminate the front surface of the solar cell 600.

[0080] With the above arrangement, the four areas where voltage is loaded on the front of the cell 600 (i.e., the areas where the four upper rollers 302a are in contact with the front of the cell 600) are symmetrically arranged on both sides of the area where the cell 600 is irradiated by the laser. This is beneficial to the sintering between the gate electrode on the cell 600 and the silicon wafer.

[0081] If both the first contact ring 3024a and the second contact ring 3024b on a set of powered roller assemblies 302 are electrically connected to the power source 302c, the set of powered roller assemblies 302 is said to be energized. When the four sets of powered roller assemblies 302 convey a battery cell 600 from back to front, if the sensing element 302e senses a battery cell 600, it indicates that the battery cell 600 is located between the upper roller 302a and the lower roller 302b of the first set of powered roller assemblies 302, thus energizing the first set of powered roller assemblies 302. Subsequently, as the battery cell 600 continues to move forward, the front side of the battery cell 600 passes the second, third, and fourth sets of powered roller assemblies 302, respectively, and the second, third, and fourth sets of powered roller assemblies 302, 302, and 302 are energized in sequence.

[0082] During the conveying process of the battery cell 600 from back to front, the rear side of the battery cell 600 will leave the first group of powered roller assemblies 302, the second group of powered roller assemblies 302, the third group of powered roller assemblies 302, and the fourth group of powered roller assemblies 302 in sequence. Therefore, during the conveying process of the battery cell 600, the first group of powered roller assemblies 302, the second group of powered roller assemblies 302, the third group of powered roller assemblies 302, and the fourth group of powered roller assemblies 302 are powered off in sequence.

[0083] It can be understood that the number of the powered roller assemblies 302 can be two, three, five or even more.

[0084] In addition to the above-mentioned arrangement rules, in another embodiment of the present invention, the arrangement rules of the four upper rollers 302a and the four lower rollers 302b from back to front can also be: the first upper roller 302a and the third upper roller 302a are the second roller 302-S, the second upper roller 302a and the fourth upper roller 302a are the first roller 302-L, the first lower roller 302b and the third lower roller 302b are the first roller 302-L, and the second lower roller 302b and the fourth lower roller 302b are the second roller 302-S.

[0085] In another embodiment of the present invention, the arrangement pattern of the four upper rollers 302a and the four lower rollers 302b from back to front can also be: the first upper roller 302a and the third upper roller 302a are the first roller 302-L, the second upper roller 302a and the fourth upper roller 302a are the second roller 302-S, the first lower roller 302b and the third lower roller 302b are the second roller 302-S, and the second lower roller 302b and the fourth lower roller 302b are the first roller 302-L.

[0086] In another embodiment of the present invention, the upper rollers 302a and the lower rollers 302b may be arranged in a pattern as follows: all upper rollers 302a are first rollers 302-L, and all lower rollers 302b are second rollers 302-S.

[0087] In another embodiment of the present invention, the arrangement pattern of the four upper rollers 302a and the four lower rollers 302b from back to front can also be: the first upper roller 302a and the fourth upper roller 302a are the first roller 302-L, the second upper roller 302a and the third upper roller 302a are the second roller 302-S, the first lower roller 302b and the fourth lower roller 302b are the second roller 302-S, and the second lower roller 302b and the third lower roller 302b are the first roller 302-L.

[0088] like Figure 11-16As shown, in one embodiment of the present invention, only one of the first contact ring 3024a and the second contact ring 3024b, which are located opposite each other, is electrically connected to the positive or negative pole of the power source 302c, and the other is not electrically connected to the power source 302c. In this way, no short circuit will occur when the first contact ring 3024a and the second contact ring 3024b, which are located opposite each other, come into contact with each other.

[0089] It should be noted that the first contact ring 3024a and the second contact ring 3024b that are electrically connected to the power source 302c may be made of a conductive material, while the one that is not electrically connected to the power source 302c may be made of an insulating material. It is understood that the first contact ring 3024a and the second contact ring 3024b may also be made of the same conductive material.

[0090] To make it easier to distinguish, Figure 11-16 In FIG. 3 , the contact ring 3024 that is not electrically connected to the power source 302 c is hatched.

[0091] In this embodiment, the lengths of the first contact ring 3024a and the second contact ring 3024b are the same and are both smaller than the horizontal dimension of the battery cell 600. Thus, the power roller assembly 302 of this embodiment is suitable for applying voltage to the above-mentioned MBB type battery cell (e.g. Figure 14 shown).

[0092] In other embodiments, the first contact ring 3024a and the second contact ring 3024b may also be larger than the size of the battery cell 600 in the lateral direction. The power roller assembly 302 of this embodiment is suitable for applying voltage to the above-mentioned 0BB type battery cell (such as Figure 15 shown).

[0093] It can be imagined that the laser powered roller assembly 302 of this embodiment is suitable for applying voltage to 0BB type battery cells, and is also suitable for applying voltage to MBB type battery cells.

[0094] Specifically, if Figure 12-15 As shown, the power roller assembly 302 comprises four groups arranged evenly in the front-to-back direction. From back to front, the four first contact rings 3024a and four second contact rings 3024b are arranged as follows: the second and third first contact rings 3024a are electrically connected to one of the positive and negative poles of the power source 302c, while the first and fourth second contact rings 3024b are electrically connected to the other of the positive and negative poles of the power source 302c. The laser assembly 301 is configured to emit a laser between the second and third upper rollers 302a, 302a, to illuminate the front surface of the solar cell 600.

[0095] With the above arrangement, the two areas where voltage is loaded on the front side of the battery cell 600 (i.e., the areas where the second first contact ring 3024a and the third first contact ring 3024a are in contact with the front side of the battery cell 600) are symmetrically arranged on both sides of the area where the battery cell 600 is irradiated by the laser, and are close to the area where the battery cell 600 is irradiated by the laser. This is beneficial to the sintering between the gate electrode on the battery cell 600 and the silicon wafer.

[0096] Since the grid lines on the MBB type battery cell are half-cell designs, the axial center distance between two adjacent sets of powered roller assemblies 302 is no more than half of the size of the battery cell 600 in the front-to-back direction, to ensure that the battery cell 600 can always remain in a state of loaded voltage during the transmission process.

[0097] In addition to the above arrangement rules, Figure 16 As shown, in another embodiment of the present invention, the arrangement pattern of the four first contact rings 3024a and the four second contact rings 3024b from back to front can also be: the second first contact ring 3024a and the fourth first contact ring 3024a are electrically connected to one of the positive and negative poles of the power supply 302c, and the first second contact ring 3024b and the third second contact ring 3024b are electrically connected to the other of the positive and negative poles of the power supply 302c.

[0098] In another embodiment of the present invention, the arrangement pattern of the four first contact rings 3024a and the four second contact rings 3024b from back to front can also be: the first first contact ring 3024a and the third first contact ring 3024a are electrically connected to one of the positive and negative poles of the power supply 302c, and the second second contact ring 3024b and the fourth second contact ring 3024b are electrically connected to the other of the positive and negative poles of the power supply 302c.

[0099] In another embodiment of the present invention, the arrangement pattern of the four first contact rings 3024a and the four second contact rings 3024b from back to front can also be: the first first contact ring 3024a and the fourth first contact ring 3024a are electrically connected to one of the positive and negative poles of the power supply 302c, and the second second contact ring 3024b and the third second contact ring 3024b are electrically connected to the other of the positive and negative poles of the power supply 302c.

[0100] To sum up, the laser sintering module and the battery cell 600 laser sintering equipment provided by the present invention can convey the battery cell 600 while applying voltage to the battery cell 600, and the laser emitted by the laser component 301 can complete the scanning of the entire battery cell 600. The entire process only requires one set of laser components 301, which reduces the manufacturing cost of the equipment.

[0101] like Figure 18-21As shown, when using the cell laser sintering equipment provided by the utility model to process the cell, the following steps are included:

[0102] Apply voltage to the battery cell 600 and transport the battery cell 600 from back to front in the front-to-back direction. Figure 18-21 The arrow on the right shows the anterior-posterior direction;

[0103] 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.

[0104] Move the laser so that the light spot performs multiple cycles of scanning along the preset scanning path.

[0105] The aforementioned application of voltage to the cell 600 specifically involves applying a reverse voltage to both the front and back surfaces of the cell 600, with a voltage value preferably ranging from 10V to 30V. When the reverse voltage is applied, an induced current is generated in the area of ​​the cell 600 irradiated by the laser. When the induced current flows through the area of ​​the cell 600 with relatively high resistance, namely, the junction between the gate electrode and the silicon wafer, a large amount of heat is generated, sintering the gate electrode and the silicon wafer, thereby reducing the contact resistance between the gate electrode and the silicon wafer. This can improve the fill factor and conversion efficiency of the cell 600.

[0106] 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 18 The middle is the left and right direction, Figure 18 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.

[0107] The scanning path is configured as follows: 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 from the second side to the first side along the third path S3, it returns to the first point O1.

[0108] 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.

[0109] 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.

[0110] 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.

[0111] like Figure 18 As shown, in one embodiment of the present invention, the third path S3 moves from the third point O3 to the first point O1. Thus, the scanning path is triangular, and the light spot scans cyclically along the triangular scanning path.

[0112] 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.

[0113] The distance between the first point O1 and the second point O2 in the front-to-back direction, as well as the distance between the third point O3 and the first point O1 in the front-to-back direction, are both equal to 0.5H. It is conceivable that in the above case, the distance between the second point O2 and the third point O3 in the front-to-back direction is H. During the process of the light spot completing one scan, the battery cell 600 moves forward by a distance H.

[0114] In this embodiment, both ends of the first path S1 and both ends of the third path S3 extend beyond the battery cell 600 in the lateral direction. In this way, when the light spot moves along the first path S1 and the third path S3, it can completely scan the battery cell 600 in the lateral direction. The light spot scans multiple times in a cycle according to the scanning path, and the scanned area can cover the battery cell 600.

[0115] Those skilled in the art will appreciate that the lengths of the first path S1 and the third path S3 are related to the transverse dimension of the cell 600, while the length of the second path S2 (i.e., the distance between the second point O2 and the third point O3 in the front-to-back direction) is related to the front-to-back dimension H of the light spot. For example, in this embodiment, the transverse dimension of the cell 600 is 182 mm. The lengths of the first path S1 and the third path S3 are slightly larger than 182 mm, at approximately 190 mm. The direction of the second path S2 is equal to H, at 2.5 mm. Clearly, the lengths of the first path S1 and the third path S3 are much greater than the length of the second path S2. Therefore, the light spot spends the vast majority of its time moving along the scanning path along the first path S1 and the third path S3, while the time spent moving along the second path S2 and the third path S3 is negligible.

[0116] 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-to-back direction is not less than 10.

[0117] In this embodiment, the lengths of the first path S1 and the third path S3 are equal. If the cell 600 moves forward at a constant speed, the distance H that the cell 600 moves forward during a single 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 a distance of 0.5H; when the light spot moves from the third point O3 to the first point O1 along the third path S3, the cell 600 moves forward a distance of 0.5H. Because the light spot moves forward a distance of 0.5H along the first path S1 and a distance of 0.5H along the third path S3, the cell 600 moves synchronously with the light spot as it moves along the first and third paths S1 and S3. Thus, when the light spot scans cyclically along the scanning path, the strips of areas on the cell 600 that the light spot scans are parallel to the horizontal direction and cover the cell 600, allowing the light spot to scan substantially all of the cell 600. When the light spot scans according to the scanning path of this embodiment, the moving track and the scanning area on the battery cell 600 are shown in the following figure: Figure 20 shown.

[0118] In another embodiment of the present invention, Figure 19 As shown, this embodiment differs from the previous embodiment in that, in this embodiment, the first path S1 is parallel to the transverse direction, i.e., the distance between the first point O1 and the second point O2 in the front-to-back direction is 0. The light spot moves along the first path S1, moving from the first side to the second side in the transverse direction, but its position in the front-to-back direction remains unchanged. The distance between the third point O3 and the first point O1 in the front-to-back direction is H. The light spot moves along the third path S3, not only from the second side to the first side, but also moves forward a distance of H in the front-to-back direction.

[0119] In this embodiment, the length of the third path S3 is slightly greater than that of the first path S1. If the cell 600 moves forward at a constant speed, the distance H that the cell 600 moves forward during a single 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 a distance of 0.5H; when the light spot moves from the third point O3 to the first point O1 along the third path S3, the cell 600 moves forward a distance of 0.5H. Because the light spot moves forward a distance of 0 when moving along the first path S1, the cell 600 and the light spot move asynchronously, with a difference of 0.5H in their movement distances. 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 H when it moves along the third path S3, the movement of the cell 600 and the light spot is also out of sync, and the movement distances of the two also differ by 0.5H. Accordingly, the strip area swept by the light spot on the cell 600 extends from back to front relative to the horizontal direction. When the light spot scans according to the scanning path of this embodiment, the moving trajectory and the swept area on the cell 600 are shown in the schematic diagram as follows: Figure 21 shown.

[0120] When the light spot scans cyclically according to the scanning path of this embodiment, the strip area swept on the battery when the light spot moves along the first path S1 and the strip area swept on the battery cell 600 when the light spot moves along the third path S3 are parallel and cover the battery cell 600. The light spot can basically scan the entire area of ​​the battery cell 600.

[0121] 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.

[0122] 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.

[0123] 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 power roller assembly includes an upper roller and a lower roller arranged opposite to each other in the vertical direction. The upper roller and the lower roller each include a rotating shaft and a contact ring sleeved on the rotating shaft for contacting the battery cell. Each upper roller and each lower roller is only provided with one contact ring. The contact ring on the upper roller is a first contact ring, and the contact ring on the lower roller is a second contact ring. The laser sintering module further includes a power supply, at least one of all the first contact rings is electrically connected to one of the positive and negative poles of the power supply, and at least one of all the second contact rings is electrically connected to the other of the positive and negative poles of the power supply.

2. The laser sintering module according to claim 1, characterized in that: All first contact rings are used to electrically connect one of the positive and negative poles of the power supply, and all second contact rings are used to electrically connect the other of the positive and negative poles of the power supply. The laser sintering module also includes a plurality of switching elements, and the switching element is arranged between at least one of the first and second contact rings that are opposite to each other and the power supply.

3. The laser sintering module according to claim 2, characterized in that: The laser sintering module further includes a sensing element, which is disposed between the first group of powered roller assemblies and the second group of powered roller assemblies from back to front, for determining whether there is a battery cell between the first group of powered roller assemblies and the second group of powered roller assemblies.

4. The laser sintering module according to claim 2, characterized in that: The first contact ring and the second contact ring opposite to each other are of different lengths, wherein the upper roller shaft or the lower roller shaft where the shorter contact ring is located is provided with two insulating sleeves respectively located on both sides of the contact ring; Among the upper roller and the lower roller, the one with the longer contact ring is the first roller, and the one with the shorter contact ring is the second roller. Among all the upper rollers, at least one is the first roller, and among all the lower rollers, at least one is the first roller.

5. The laser sintering module according to claim 4, characterized in that: The length of the shorter contact ring plus the length of the two insulating sleeves is equal to the length of the longer contact ring.

6. The laser sintering module according to claim 4, characterized in that: The powered roller shaft assembly is provided with four groups along the front-to-back direction and is evenly arranged. Among the four upper roller shafts from the back to the front, the first upper roller shaft and the fourth upper roller shaft are the second roller shafts, the second upper roller shaft and the third upper roller shaft are the first roller shafts; among the four lower roller shafts from the back to the front, the first lower roller shaft and the fourth lower roller shaft are the first roller shafts, and the second lower roller shaft and the third lower roller shaft are the second roller shafts; The laser assembly is used for emitting laser light between the second upper roller and the third upper roller.

7. The laser sintering module according to claim 1, characterized in that: Only one of the first contact ring and the second contact ring that are opposite to each other is electrically connected to the positive electrode or the negative electrode of the power supply.

8. The laser sintering module according to claim 7, characterized in that: The power roller assembly is provided with four groups along the front-to-back direction and is evenly arranged. Among the four first contact rings and the four second contact rings from the back to the front, the second first contact ring and the third first contact ring are electrically connected to one of the positive and negative poles of the power supply, and the first second contact ring and the fourth second contact ring are electrically connected to the other of the positive and negative poles of the power supply; The laser assembly is used for emitting laser light between the second upper roller and the third upper roller.

9. The laser sintering module according to claim 1, characterized in that: The rotating shaft includes a main shaft, an insulating layer sleeved on the main shaft, and a conductive layer sleeved on the insulating layer. The contact ring is sleeved on the conductive layer. At least one of the conductive layers of all upper rollers is electrically connected to one of the positive and negative poles of the power supply, and at least one of the conductive layers of all lower rollers is electrically connected to the other of the positive and negative poles of the power supply.

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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