Voltage loading unit and laser-induced sintering equipment

Abstract

The utility model relates to the technical field of solar cell laser-induced sintering equipment, in particular to a voltage loading unit and laser-induced sintering equipment. The voltage loading unit comprises a first contact assembly and a second contact assembly. The first contact assembly comprises a first installation base body and contact accessories, the contact accessories are detachably installed on the first installation base body, the contact accessories are of various types, and the contact accessories are configured to select the corresponding types to be installed on the first installation base body according to the types of the solar cells to be contacted. The contact fitting of the first type is a press-fit contact which is configured to be in press-fit contact with the front surface of the back-contact solar cell; the contact fitting of the second type is a first electrode contact kit, and the first electrode contact kit is configured to conductively contact an electrode on the other side of the double-sided electrode solar cell. The second contact assembly is configured to conductively contact an electrode of the back contact solar cell and an electrode on one side of the double-sided electrode solar cell.

Description

Technical Field

[0001] This application relates to the field of solar cell laser-induced sintering equipment technology, and in particular to a voltage loading unit and laser-induced sintering equipment. Background Technology

[0002] Laser-induced sintering (LAS) is a laser sintering technology used to improve the contact between metal electrodes and silicon wafers in solar cells. The LAS process requires applying a bias voltage to the solar cell. However, because the voltage application units in related technologies can only apply bias voltage to one type of solar cell, the LAS equipment can only perform LAS induced sintering on one type of solar cell, resulting in poor adaptability. Utility Model Content

[0003] This application discloses a voltage loading unit and a laser-induced sintering apparatus, capable of applying a reverse bias voltage to both back-contact solar cells and bifacial electrode solar cells. To achieve the above objective, in a first aspect, this application discloses a voltage loading unit, comprising:

[0004] A first contact assembly includes a first mounting base and contact fittings. The contact fittings are detachably mounted on the first mounting base. The contact fittings are of various types and are configured to be mounted on the first mounting base according to the type of solar cell to be contacted. The types of solar cells include back-contact solar cells and bifacial electrode solar cells. A first type of contact fitting is a press-fit contact configured to press-fit against the front side of the back-contact solar cell. A second type of contact fitting is a first electrode contact kit configured to conductively contact the electrode on the other side of the bifacial electrode solar cell.

[0005] The second contact assembly is configured to make conductive contact with the electrodes of the back contact solar cell and the electrodes on one side of the bifacial electrode solar cell.

[0006] In a possible implementation of the first aspect, the second contact component includes:

[0007] A second mounting base, wherein a first conductive line and a second conductive line are provided on the second mounting base, wherein one of the first conductive line and the second conductive line is a positive terminal line and the other is a negative terminal line; and

[0008] The second electrode contact kit is detachably mounted on the second mounting base. The second electrode contact kit has several types and is configured to be mounted on the second mounting base according to the type of solar cell to be contacted. A first type of second electrode contact kit is partially electrically connected to the first conductive line and partially electrically connected to the second conductive line, and is configured to conductively contact the electrode on the back side of the back contact solar cell. A second type of second electrode contact kit is electrically connected to the first conductive line and is configured to conductively contact the electrode on one side of the bifacial solar cell.

[0009] In a possible implementation of the first aspect, the second electrode contact kit of the first type includes:

[0010] A plurality of first probes, wherein the plurality of first probes are detachably mounted on the second mounting base and electrically connected to the first conductive line; and

[0011] A plurality of second probes, wherein the plurality of second probes are detachably mounted on the second mounting base and electrically connected to the second conductive line;

[0012] The first probe and the second probe are configured to make conductive contact with the positive and negative electrodes of the back contact solar cell, respectively.

[0013] In one possible implementation of the first aspect, the second mounting base is provided with a plurality of first conductive inserts and a plurality of second conductive inserts, each of the first conductive inserts being electrically connected to the first conductive line, each of the second conductive inserts being electrically connected to the second conductive line, each of the first probes being detachably inserted into each of the first conductive inserts, and each of the second probes being detachably inserted into each of the second conductive inserts.

[0014] In a possible implementation of the first aspect, the press-fit contact is a hollow press-fit, the hollow press-fit having a hollow portion configured to expose a portion of the front side of the back contact solar cell;

[0015] When the hollowed-out pressing component is disposed opposite to the second mounting base, in the relative direction between the hollowed-out pressing component and the second mounting base, the area of ​​the hollowed-out portion projected onto the second mounting base is offset from the setting areas of the first probe and the second probe.

[0016] In a possible implementation of the first aspect, the second type of the second electrode contact kit includes:

[0017] A conductive platform is detachably mounted on the second mounting base and electrically connected to the first conductive line, the conductive platform being configured to make conductive contact with an electrode on one side of the bifacial electrode solar cell.

[0018] In a possible implementation of the first aspect, the conductive platform is provided with an insulating support member, which is configured to abut against the second mounting base so that the conductive platform is mounted on the second mounting base and isolated from the second conductive line;

[0019] And / or, the conductive platform is provided with a conductive mounting part, the second mounting base is provided with an electrical connection hole, the electrical connection hole is located on the first conductive line, the conductive mounting part is detachably mounted on the electrical connection hole, and the conductive mounting part is configured to be electrically connected to the first conductive line when connected to the electrical connection hole;

[0020] And / or, the conductive platform has a bonding surface configured to bond with the bifacial electrode solar cell, and the bonding surface has through holes;

[0021] And / or, the conductive platform has a clearance notch on its edge;

[0022] And / or, the conductive platform has multiple specifications, and the conductive platform is configured to select the appropriate specification according to the specifications of the bifacial electrode solar cell to be contacted and install it on the second mounting substrate, the specifications of the bifacial electrode solar cell including whole solar cell and sliced ​​solar cell.

[0023] In a possible implementation of the first aspect, the second contact assembly further includes a second movable frame, the second mounting base being detachably mounted on the second movable frame, the second movable frame being configured to drive the second mounting base to displace vertically and in two intersecting lateral directions and to rotate about a vertical axis; wherein the two intersecting lateral directions constitute a displacement plane, and the vertical axis is perpendicular to the displacement plane;

[0024] And / or, the second mounting base has multiple specifications, and the second mounting base is configured to select the appropriate specification according to the specifications of the solar cell to be contacted, the specifications of the solar cell to be contacted include whole solar cells and sliced ​​solar cells.

[0025] And / or, the second mounting base is a mounting plate.

[0026] In a possible implementation of the first aspect, the first electrode contact kit includes:

[0027] A fixed frame is provided with sliding grooves on both opposite sides of the fixed frame, and the fixed frame can be detachably installed on the first mounting base;

[0028] A probe array, wherein the two ends of the probe array are slidably connected to the two grooves respectively; and

[0029] A plurality of third probes are disposed on the probe array, the third probes being configured to make conductive contact with an electrode on one of the surfaces of the bifacial electrode solar cell.

[0030] In a possible implementation of the first aspect, the pressing contact is a hollow pressing contact having a hollow portion, the hollow pressing contact being configured to press against a portion of the front side of the back contact solar cell, and the hollow portion being configured to expose a portion of the front side of the back contact solar cell so that a laser can scan the portion of the back contact solar cell through the hollow portion.

[0031] And / or, the pressing contact is a perforated glass plate.

[0032] In a possible implementation of the first aspect, the first contact assembly further includes a first movable frame, the first mounting base being connected to the first movable frame, the first movable frame being configured to drive the first mounting base to displace vertically and in two intersecting lateral directions and to rotate about a vertical axis; wherein the two intersecting lateral directions constitute a displacement plane, and the vertical axis is perpendicular to the displacement plane.

[0033] And / or, the first contact component is located above the second contact component;

[0034] And / or, the first mounting base is a mounting bracket, and either the press-fit contact or the first electrode contact kit is screwed onto the mounting bracket.

[0035] Secondly, embodiments of this application disclose a laser-induced sintering apparatus, comprising:

[0036] Several voltage loading units as described in the first aspect; and

[0037] A plurality of lasers, each laser being configured to perform laser-induced sintering of the solar cell located between a second contact assembly and a first contact assembly of each voltage loading unit.

[0038] In a possible implementation of the second aspect, the laser-induced sintering equipment further includes a plurality of wafer transfer mechanisms, each of which includes:

[0039] A plurality of adsorption components, the adsorption components being configured to adsorb the solar cells; and

[0040] A displacement driving component is provided, wherein the adsorption component is driven to connect to the displacement driving component, the displacement driving component is configured to drive the adsorption component to move relative to the voltage loading unit, the adsorption component has a first transfer position, and the adsorption component located at the first transfer position is correspondingly disposed to the voltage loading unit.

[0041] In a possible implementation of the second aspect, the adsorption assembly includes a transfer plate holder and several suction nozzle kits;

[0042] The plate transfer bracket is driven by the displacement driving component, which is configured to drive the plate transfer bracket to move in the lateral and vertical directions.

[0043] The inner periphery of the transfer bracket defines a clearance space, the size of which is larger than the size of the second contact component; each of the nozzle kits is disposed on the transfer bracket and extends into the clearance space, and the transfer bracket located at the first transfer position is configured to move relative to the second contact component in the vertical direction through the clearance space, so as to transfer the solar cell between the nozzle kit and the second contact component;

[0044] The nozzle kit has multiple lengths and is configured to select the appropriate length according to the specifications of the solar cell to be adsorbed, including whole solar cells and sliced ​​solar cells.

[0045] In a possible implementation of the second aspect, the nozzle kit includes a nozzle mounting member and a nozzle disposed on the nozzle mounting member, the nozzle mounting member being detachably mounted on the transfer bracket, the nozzle mounting member having multiple lengths, and the nozzle mounting member being configured to select the appropriate length according to the specifications of the solar cell to be adsorbed;

[0046] Alternatively, the nozzle kit includes a nozzle mounting component and a nozzle disposed on the nozzle mounting component. The nozzle mounting component is mounted on the transfer plate support. The length of the nozzle mounting component is extendable and is configured to select an appropriate length according to the specifications of the solar cell to be adsorbed.

[0047] And / or, the displacement drive assembly includes a motor, a slide rail, a slide table, and a cylinder, wherein the motor is driven and connected to the slide table, the slide table is slidably connected to the slide rail, the motor is configured to drive the slide table to move laterally along the slide rail, the cylinder is disposed on the slide table, the plate transfer bracket is connected to the cylinder, and the cylinder drives the plate transfer bracket to move vertically.

[0048] And / or, the nozzle kit is in two sets, with the two sets of nozzle kits respectively disposed on two opposite sides of the transfer plate bracket.

[0049] In a possible implementation of the second aspect, each of the sheet-transfer mechanisms further includes a plurality of conveyor belts, each of the conveyor belts comprising:

[0050] Two transmission rods, the two transmission rods being arranged opposite each other; and

[0051] Two conveyor belts are provided, with two drive rods movably connected to both ends of each conveyor belt along its length. The distance between the two conveyor belts is configured to be adjusted according to the specifications of the solar cells to be conveyed, and the solar cells are conveyed along the transverse direction. The specifications of the solar cells include whole solar cells and sliced ​​solar cells.

[0052] The adsorption component also has several second transfer positions, and the adsorption component located at the second transfer position is arranged opposite to the transport belt in the vertical direction so that the solar cell is transferred between the transport belt and the adsorption component.

[0053] In a possible implementation of the second aspect, in the lateral direction, the sheet support is provided with clearance recesses on two opposite sides, the clearance recesses being configured to avoid the transmission belt when the sheet support is displaced in the vertical direction;

[0054] And / or, the laser-induced sintering equipment further includes an illumination device and an imaging device. When the wafer transfer bracket is located in the second transfer position, the illumination device is located below the wafer transfer bracket, and the imaging device is located above the wafer transfer bracket.

[0055] And / or, the number of conveyor belts in each of the sheet transfer mechanisms is two, the two conveyor belts are respectively arranged on two opposite sides of the voltage loading unit, the adsorption component has two second transfer positions, and the adsorption component located at each of the second transfer positions is arranged opposite to the transmission belt of each of the conveyor belts in the vertical direction.

[0056] In a possible implementation of the second aspect, each of the transmission rods is provided with two opposing first pulleys and two opposing second pulleys, with each second pulley respectively disposed on the outer side of each of the first pulleys;

[0057] The transport belt is configured to connect to either the two first pulleys or the two second pulleys, depending on the specifications of the solar cells to be transported.

[0058] In a possible implementation of the second aspect, there are two voltage loading units and two lasers, with each voltage loading unit corresponding to each laser; the pressing contact of each voltage loading unit is a hollow pressing part, each hollow pressing part has a hollow portion, and the shapes of the two hollow portions are complementary to each other.

[0059] And / or, the number of the wafer transfer mechanism is two, and each wafer transfer mechanism is configured corresponding to each voltage loading unit;

[0060] And / or, the laser is located above the voltage-loaded unit.

[0061] Compared with the prior art, the beneficial effect of this application is that the voltage loading unit can apply reverse bias voltage to two types of solar cells, as follows:

[0062] The contact fittings of the voltage loading unit are available in various types. The contact fittings are configured to be installed on the first mounting base according to the type of solar cell to be contacted. The types of solar cells include back contact solar cells and bifacial electrode solar cells.

[0063] When the solar cell to be contacted by the voltage loading unit is a back-contact solar cell, the first contact assembly selects a press-fit contact that is detachably mounted on the first mounting base. The press-fit contact presses against the front side of the back-contact solar cell, and the second contact assembly makes conductive contact with the electrodes on the back side of the back-contact solar cell to apply a bias voltage to the back-contact solar cell.

[0064] When the solar cell to be contacted is a voltage-loaded unit bifacial electrode solar cell, the first contact assembly is selected and the first electrode contact kit is detachably installed on the first mounting base. The second contact assembly and the first electrode contact kit respectively make conductive contact with the electrodes on the two surfaces of the bifacial electrode solar cell to apply a bias voltage to the bifacial electrode solar cell.

[0065] In summary, this voltage loading unit can apply a reverse bias voltage to both back-contact solar cells and bifacial electrode solar cells, enabling the laser-induced sintering equipment equipped with this voltage loading unit to perform laser-induced sintering on various types of solar cells. Attached Figure Description

[0066] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0067] Figure 1 This is a schematic diagram of the structure of a voltage loading unit (the type of solar cell to be contacted is a back contact solar cell) disclosed in an embodiment of this application;

[0068] Figure 2 for Figure 1 A schematic diagram of the voltage loading unit in the diagram;

[0069] Figure 3 This is a schematic diagram of the structure of a voltage loading unit (the type of solar cell to be contacted is a bifacial electrode solar cell) disclosed in an embodiment of this application;

[0070] Figure 4 for Figure 3 A schematic diagram of the voltage loading unit in the diagram;

[0071] Figure 5 This is a perspective view of the second contact component (the type of solar cell to be contacted is a back contact solar cell) disclosed in the embodiments of this application;

[0072] Figure 6 for Figure 5 Top view;

[0073] Figure 7 for Figure 5 Another top view;

[0074] Figure 8 This is a schematic diagram of the structure of a second mounting substrate of a specification disclosed in an embodiment of this application (the solar cell to be contacted is a whole solar cell);

[0075] Figure 9 This is a schematic diagram of the structure of a second mounting substrate (the solar cell to be contacted is a sliced ​​solar cell) of another specification disclosed in an embodiment of this application.

[0076] Figure 10 This is a schematic diagram of the structure of a conductive platform of a specification disclosed in an embodiment of this application (the specification of the bifacial electrode solar cell to be contacted is a whole solar cell);

[0077] Figure 11 This is a schematic diagram of the structure of another specification of conductive platform disclosed in an embodiment of this application (the specification of the bifacial electrode solar cell to be contacted is a sliced ​​solar cell);

[0078] Figure 12 This is a schematic diagram of the structure of a laser-induced sintering device (the type of solar cell to be contacted is a back contact solar cell) disclosed in an embodiment of this application;

[0079] Figure 13This is a schematic diagram of the structure of two voltage loading units (the type of solar cell to be contacted is a back contact solar cell) in the laser-induced sintering equipment disclosed in the embodiments of this application;

[0080] Figure 14 This is a schematic diagram of the structure of the transfer mechanism disclosed in the embodiments of this application;

[0081] Figure 15 This is a schematic diagram of the structure of the adsorption component (the solar cell to be adsorbed is a whole solar cell) disclosed in the embodiments of this application;

[0082] Figure 16 This is a schematic diagram of the structure of the adsorption component (the solar cell to be adsorbed is a sliced ​​solar cell) disclosed in the embodiments of this application;

[0083] Figure 17 This is a schematic diagram of the structure of the conveyor belt (the solar cells to be transported are sliced ​​solar cells) disclosed in the embodiments of this application;

[0084] Figure 18 This is a schematic diagram of the structure of the conveyor belt (the solar cells to be transported are whole solar cells) disclosed in the embodiments of this application.

[0085] Explanation of reference numerals in the attached figures:

[0086] 1. Voltage loading unit; 10a. First contact assembly; 11. First mounting base; 12. Press-fit contact; 121. Cutout; 13. First electrode contact kit; 131. Fixing frame; 132. Probe array; 133. Third probe; 134. Slide groove; 14. First movable frame; 10b. Second contact assembly; 15. Second mounting base; 151. First conductive line; 152. Second conductive line; 153. First conductive insert; 154. Second conductive insert; 155. Electrical connection hole; 16a. First type of second electrode contact kit; 161. First probe; 162. Second probe; 16b. Second type of second electrode contact kit; 163. Conductive platform; 1631. Insulating support; 16 32. Conductive mounting part; 1633. Adhesive surface; 1634. Clearance notch; 1635. Through hole; 17. Second movable frame; 2. Laser; 3. Transfer mechanism; 31. Adsorption assembly; 311. Transfer bracket; 3111. Clearance recess; 312. Nozzle kit; 3121. Nozzle mounting part; 3122. Nozzle; 313. Clearance space; 32. Displacement drive assembly; 321. Motor; 322. Slide rail; 323. Slide table; 324. Cylinder; 4. Conveyor belt; 41. Transmission rod; 42. Transmission belt; 43. First pulley; 44. Second pulley; 5. Lighting device; 6. Imaging device; 7a. Back contact solar cell; 7b. Bifacial electrode solar cell; 7c. Whole solar cell; 7d. Sliced ​​solar cell. Detailed Implementation

[0087] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0088] In this application, the terms "upper," "inner," "outer," "lateral," and "vertical," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0089] Furthermore, in addition to indicating location or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0090] Furthermore, the terms "installation," "setup," "equipped with," "connection," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0091] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, elements, or components (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, elements, or components. Unless otherwise stated, "a plurality of" means two or more.

[0092] The technical solution of this utility model will be described below with reference to the embodiments and accompanying drawings.

[0093] Firstly, please combine Figures 1 to 4 This application discloses a voltage loading unit 1, which includes a first contact component 10a and a second contact component 10b.

[0094] The first contact assembly 10a includes a first mounting base 11 and contact accessories. The contact accessories are detachably mounted on the first mounting base 11. The contact accessories are of various types and are configured to be mounted on the first mounting base 11 according to the type of solar cell to be contacted. The types of solar cells include back-contact solar cells 7a and bifacial electrode solar cells 7b. A first type of contact accessory is a press-fit contact 12, which is configured to press-fit the front side of the back-contact solar cell 7a. A second type of contact accessory is a first electrode contact kit 13, which is configured to conductively contact the electrode on the other side of the bifacial electrode solar cell 7b.

[0095] The second contact component 10b is configured to make a conductive contact with the electrode of the back contact solar cell 7a and the electrode on one side of the bifacial electrode solar cell 7b.

[0096] It should be noted that the aforementioned bifacial electrode solar cell 7b refers to a solar cell with electrodes on both the front and back sides, such as a tunnel-oxide-passivated contact solar cell (TOPcon cell). The aforementioned pressing contact 12 refers to an object used to contact and apply pressure to the back contact solar cell 7a, such as a pressing plate, pressing block, pressing frame, or pressing bracket. The aforementioned first electrode contact kit 13 refers to a kit that connects to the electrode on the other side of the bifacial electrode solar cell 7b, such as a probe array 132, which only needs to be able to make conductive contact with the electrode.

[0097] This voltage loading unit 1 can apply reverse bias voltage to two types of solar cells, as detailed below:

[0098] When the solar cell to be contacted is a back-contact solar cell 7a, the first contact assembly 10a selects the pressing contact 12 to be detachably installed on the first mounting base 11, the pressing contact 12 presses against the front side of the back-contact solar cell 7a, and the second contact assembly 10b makes conductive contact with the electrodes on the back side of the back-contact solar cell 7a to apply a bias voltage to the back-contact solar cell 7a.

[0099] When the solar cell to be contacted is a bifacial electrode solar cell 7b, the first contact assembly 10a selects the first electrode contact kit 13 to be detachably installed on the first mounting base 11, and the second contact assembly 10b and the first electrode contact kit 13 respectively make conductive contact with the electrodes on the two surfaces of the bifacial electrode solar cell 7b to apply a bias voltage to the bifacial electrode solar cell 7b.

[0100] In summary, the voltage loading unit 1 can apply a reverse bias voltage to two types of solar cells, namely back contact solar cell 7a and bifacial electrode solar cell 7b, so that the laser-induced sintering equipment with the voltage loading unit 1 can perform laser-induced sintering on various types of solar cells.

[0101] The first contact component will be described in detail below:

[0102] In some embodiments, referencing the back Figure 1 and Figure 2 The press-fit contact 12 is a hollow press-fit component with a hollow portion 121. The hollow press-fit component is configured to press-fit a portion of the front side of the back contact solar cell 7a. The hollow portion 121 is configured to expose a portion of the front side of the back contact solar cell 7a so that the laser can scan the portion of the front side of the back contact solar cell 7a through the hollow portion 121.

[0103] The solid portion of the press-fit contact 12 that contacts the back contact solar cell 7a is prone to wear and scratches. If the press-fit contact is a single piece, such as a single piece of glass, the laser can only pass through the scratches to scan the back contact solar cell, thus affecting the laser-induced sintering effect. However, in the hollow press-fit component of this application, the laser scans a portion of the front side of the back contact solar cell 7a through the hollow portion 121, so even if there are scratches on the solid portion of the hollow press-fit component that contacts the back contact solar cell 7a, it does not affect the laser effect.

[0104] Alternatively, the perforated pressing component may be, for example, a perforated plate, a perforated support, or a perforated film. The material of the perforated pressing component is preferably a light-transmitting and insulating material, such as glass and transparent plastic.

[0105] Preferably, the pressing contact 12 is a perforated glass plate. This is because glass is relatively smooth, resulting in less friction when the perforated glass plate presses against the back contact of the solar cell 7a. Furthermore, glass has high hardness, allowing for prolonged use with minimal wear. In addition, the transparency of the perforated glass plate allows operators to easily observe the surface of the back contact solar cell 7a for debris, facilitating its removal. Finally, the glass is an insulating material, reducing the risk of leakage and short circuits.

[0106] In some embodiments, refer to Figure 3 and Figure 4 The first electrode contact kit 13 includes a fixing frame 131, a probe array 132, and a plurality of third probes 133. The fixing frame 131 has grooves 134 on both opposite sides, and is detachably mounted on the first mounting base 11. The probe array 132 is slidably connected to two grooves 134 at both ends. The plurality of third probes 133 are disposed on the probe array 132, and are configured to make conductive contacts to the electrodes on one surface of the bifacial electrode solar cell 7b.

[0107] The probe array 132 is detachably mounted on the first mounting base 11 via a fixing frame 131. It is understood that a light-transmitting window is formed on the inner periphery of the fixing frame 131, through which a laser can scan the solar cell. Furthermore, the probe array 132 can slide along a groove 134 on the fixing frame 131 to adjust its position, facilitating conductive contact with electrodes at different locations.

[0108] Optionally, refer to Figure 1 and Figure 3 , Figure 1 and Figure 3 The Z-axis direction is vertical, as shown in the figure. The first contact component 10a is located above the second contact component 10b. It can be understood that the first contact component 10a is positioned above the second contact component 10b in a vertical relative motion. When the solar cell is fed into the voltage loading unit 1, it is placed on the upper side of the second contact component 10b to achieve conductive contact. Then, the first contact component 10a and the second contact component 10b approach each other to fix the solar cell between the first contact component 10a and the second contact component 10b for laser-induced sintering.

[0109] Optionally, refer to Figure 1 and Figure 3 The first contact assembly 10a further includes a first movable frame 14, to which the first mounting base 11 is connected. The first movable frame 14 is configured to drive the first mounting base 11 to displace vertically and in two intersecting lateral directions and to rotate about a vertical axis; wherein the two intersecting lateral directions form a displacement plane, and the vertical axis is perpendicular to the displacement plane. Specifically, the vertical direction is as follows: Figure 1 and Figure 3 In the Z-axis direction, the first mounting base 11 is vertically displaced to move the contact fitting closer to or away from the second electrode contact kit. The two intersecting transverse directions can be two perpendicular horizontal directions, such as... Figure 1 and Figure 3 As shown in the diagram, the X-axis and Y-axis directions define the displacement plane as the plane formed by the X-axis and Y-axis directions, with the perpendicular axis being... Figure 1 and Figure 3The Z-axis shown is perpendicular to the plane formed by the X-axis and Y-axis directions. The first mounting base 11 displaces in two intersecting lateral directions and rotates about the vertical axis to adjust the angle and position of the contact accessory, thereby aligning the contact accessory with the solar cell on the second contact assembly 10b. Regarding the drive structure of the first movable frame 14, for example, the second movable frame 17 is connected to a rotating platform that rotates about the Z-axis. This rotating platform is mounted on a Y-axis displacement mechanism, which is mounted on an X-axis displacement mechanism, and the X-axis displacement mechanism is mounted on a Z-axis displacement mechanism. The Z-axis, Y-axis, and X-axis displacement mechanisms can be lead screw and nut assemblies, gear and rack assemblies, or linear motor assemblies.

[0110] Optionally, refer to Figure 1 and Figure 3 The first mounting base 11 serves as a mounting bracket, with either the press-fit contact 12 or the first electrode contact kit 13 screwed onto the bracket to facilitate the installation and removal of both components. Furthermore, the mounting bracket has a small light-shielding area, thus avoiding laser obstruction.

[0111] The second contact component will be described in detail below:

[0112] In some embodiments, refer to Figure 1 as well as Figures 5 to 7 The second contact assembly 10b includes a second mounting base 15 and a second electrode contact kit. The second mounting base 15 has a first conductive line 151 and a second conductive line 152, one of which is a positive electrode line and the other is a negative electrode line. The pattern of the first conductive line 151 and the second conductive line 152 can be set according to the electrode pattern on the back contact solar cell to be contacted. It is understood that one of the first conductive line 151 and the second conductive line 152 is electrically connected to the positive electrode of an external power source, and the other is electrically connected to the negative electrode of an external power source. To avoid short circuits, the second mounting base 15 is preferably made of an insulating material, and an insulating structure can also be provided between the first conductive line 151 and the second conductive line 152.

[0113] The second electrode contact kit is detachably mounted on the second mounting base 15. The second electrode contact kit is available in various types and is configured to be mounted on the second mounting base 15 according to the type of solar cell to be contacted.

[0114] like Figure 1 , Figure 6 and Figure 7As shown, the first type of second electrode contact kit 16a is partially electrically connected to the first conductive line 151 and partially electrically connected to the second conductive line 152. The first type of second electrode contact kit 16a is configured to make conductive contact with the electrodes on the back of the solar cell 7a.

[0115] like Figure 4 , Figure 6 and Figure 7 As shown, the second type of second electrode contact kit 16b is electrically connected to the first conductive line 151, and the second type of second electrode contact kit 16b is configured to conductively contact the electrode on one side of the bifacial electrode solar cell 7b.

[0116] The second electrode contact kit of the second contact assembly 10b has multiple types, thus enabling conductive contact with two types of solar cells, as detailed below:

[0117] When the solar cell to be contacted is a back-contact solar cell 7a, the second contact assembly 10b is detachably mounted on the second mounting base 15 using a first-type second electrode contact kit 16a. The first-type second electrode contact kit 16a makes conductive contact with the electrodes on the back side of the back-contact solar cell 7a to apply a reverse bias voltage to the back-contact solar cell 7a. At the same time, the pressing contact 12 presses against the front side of the back-contact solar cell 7a, so that the back-contact solar cell 7a is relatively fixed in its cooperation with the second electrode contact kit, thereby improving the stability of the electrical connection.

[0118] When the solar cell to be contacted is a bifacial electrode solar cell 7b, the second contact assembly 10b is selected to be a second type of second electrode contact kit 16b and is detachably mounted on the second mounting base 15. The first electrode contact kit 13 and the second type of second electrode contact kit 16b are used to make conductive contact with the electrodes on the two surfaces of the bifacial electrode solar cell 7b to apply a bias voltage to the bifacial electrode solar cell 7b.

[0119] Optionally, refer to Figure 1 and Figure 3 The second mounting base 15 is a mounting plate. Optionally, the second contact assembly 10b further includes a second movable frame 17, on which the second mounting base 15 is detachably mounted. The second movable frame 17 is configured to drive the second mounting base 15 to displace vertically and in two intersecting lateral directions, and to rotate about a vertical axis. The two intersecting lateral directions form a displacement plane, and the vertical axis is perpendicular to the displacement plane. Specifically, the vertical direction is as follows... Figure 1 and Figure 3 In the Z-axis direction, the second mounting base 15 is vertically displaced to bring the second electrode contact kit closer to or away from the contact fitting. Two intersecting transverse directions can be two perpendicular horizontal directions, such as... Figure 1 and Figure 3 As shown in the diagram, the X-axis and Y-axis directions define the displacement plane as the plane formed by the X-axis and Y-axis directions, with the perpendicular axis being... Figure 1 and Figure 3 The Z-axis shown is perpendicular to the plane formed by the X-axis and Y-axis directions. The second mounting base 15 is displaced in two intersecting lateral directions and rotated about the vertical axis to adjust the position and angle of the second electrode contact kit, thereby achieving conductive contact with the solar cell. Regarding the drive structure of the second movable frame 17, for example, the second movable frame 17 is connected to a rotating platform that rotates about the Z-axis. This rotating platform is mounted on a Y-axis displacement mechanism, which is mounted on an X-axis displacement mechanism, and the X-axis displacement mechanism is mounted on a Z-axis displacement mechanism. The Z-axis, Y-axis, and X-axis displacement mechanisms can be lead screw and nut assemblies, gear and rack assemblies, or linear motor assemblies.

[0120] Optionally, refer to Figure 2 The first type of second electrode contact kit 16a includes a plurality of first probes 161 and a plurality of second probes 162. The plurality of first probes 161 are detachably mounted on the second mounting base 15 and electrically connected to the first conductive line 151. The plurality of second probes 162 are detachably mounted on the second mounting base 15 and electrically connected to the second conductive line 152.

[0121] The first probe 161 and the second probe 162 are configured to make conductive contact with the positive and negative electrodes of the back contact solar cell 7a, respectively.

[0122] On the other hand, refer to Figure 2 When the hollowed-out pressing component is positioned opposite to the second mounting base 15, the area of ​​the hollowed-out portion 121 projected onto the second mounting base 15 in the opposite direction between the hollowed-out pressing component and the second mounting base 15 is offset from the areas where the first probe 161 and the second probe 162 are positioned. Since the first probe 161 and the second probe 162 exert pressure on the corresponding areas when in contact with the back contact solar cell 7a, if the pressure-bearing area of ​​the back contact solar cell 7a overlaps with the hollowed-out portion 121, the pressure-bearing area of ​​the back contact solar cell 7a will be crushed due to lack of support. In other words, by offsetting the hollowed-out portion 121 from the first probe 161 and the second probe 162, the area of ​​the back contact solar cell 7a corresponding to the hollowed-out portion 121 does not contact the first probe 161 and the second probe 162, thus preventing the back contact solar cell 7a from being crushed by the first probe 161 and the second probe 162.

[0123] The first type of second electrode contact kit 16a utilizes the first probe 161 and the second probe 162 to make conductive contact with the positive and negative electrodes of the solar cell 7a, achieving high docking accuracy. Furthermore, the first probe 161 and the second probe 162 are detachable, allowing for installation according to specific contact requirements.

[0124] Furthermore, please combine Figure 2 , Figure 6 and Figure 7 The second mounting base 15 is provided with a plurality of first conductive inserts 153 and a plurality of second conductive inserts 154. Each first conductive insert 153 is electrically connected to a first conductive line 151, and each second conductive insert 154 is electrically connected to a second conductive line 152. Each first probe 161 is detachably inserted into each first conductive insert 153, and each second probe 162 is detachably inserted into each second conductive insert 154.

[0125] The first conductive insert 153 and the second conductive insert 154 can be conductive sockets or conductive hollow cylinders. The function of the first conductive insert 153 and the second conductive insert 154 is to allow the operator to quickly install the first probe 161 and the second probe 162 at the designated positions on the second mounting base 15.

[0126] Optionally, please combine Figure 3 , Figure 4 and Figure 6 The second type of second electrode contact kit 16b includes a conductive platform 163, which is detachably mounted on the second mounting base 15 and electrically connected to the first conductive line 151. The conductive platform 163 is configured to conductively contact the electrode on one side of the bifacial electrode solar cell 7b.

[0127] It should be noted that since the electrode on one side of the bifacial solar cell 7b can only be either a positive or negative electrode, the conductive platform 163 can make full-surface contact with the bifacial solar cell 7b without short-circuiting. Compared to the probe-to-electrode method, the conductive platform 163's full-surface contact with the electrode on one side of the bifacial solar cell 7b reduces the requirements for alignment accuracy.

[0128] On the other hand, referring to the return Figure 3 One of the third probe 133 and the conductive platform 163 is electrically connected to the positive terminal of the external power supply, and the other is electrically connected to the negative terminal of the external power supply. The external power supply is electrically connected to the positive and negative terminals of the bifacial electrode solar cell 7b through the third probe 133 and the conductive platform 163, respectively, thereby applying a reverse bias voltage.

[0129] Optionally, refer to Figure 3 The conductive platform 163 has a clearance notch 1634 on its edge. The clearance notch 1634 is used to avoid devices that transport bifacial electrode solar cells, such as suction nozzles. During loading, the suction nozzle picks up the solar cell and passes downward through the clearance notch 1634. The solar cell stays on the conductive platform 163, while the suction nozzle moves away from the underside of the conductive platform 163.

[0130] Optionally, please combine Figure 3 and Figure 4 The conductive platform 163 has a bonding surface 1633, which is configured to bond with the bifacial electrode solar cell 7b. A through-hole 1635 is provided on the bonding surface 1633. Since the bifacial electrode solar cell 7b easily adheres to the bonding surface 1633, for example, due to electrostatic adhesion, the through-hole 1635 allows gas to enter between the bifacial electrode solar cell 7b and the bonding surface 1633, making it easier to separate the bifacial electrode solar cell 7b and the bonding surface 1633.

[0131] Optionally, combined Figure 4 and Figure 6 The conductive platform 163 is provided with an insulating support 1631, which may be, for example, an insulating support column or an insulating support block. The insulating support 1631 is configured to abut against the second mounting base 15 so that the conductive platform 163 is mounted on the second mounting base 15 and isolated from the second conductive line 152. The conductive platform 163 is mounted on the second mounting base 15 via the insulating support 1631 and is separated from the second conductive insert 154 on the second mounting base 15, thereby isolating it from the second conductive line 152 and preventing short circuits.

[0132] Optionally, combined Figure 4 and Figure 6 The conductive platform 163 is provided with a conductive mounting part 1632, and the second mounting base 15 is provided with an electrical connection hole 155. The electrical connection hole 155 is located on the first conductive line 151. The conductive mounting part 1632 is detachably mounted to the electrical connection hole 155. The conductive mounting part 1632 is configured to be electrically connected to the first conductive line 151 when connected to the electrical connection hole 155. The conductive mounting part 1632 serves the functions of assembly and conduction. For example, the conductive mounting part 1632 is columnar and has a threaded hole. A bolt passes through the electrical connection hole 155 and is screwed into the threaded hole, so that the conductive mounting part 1632 is connected to the electrical connection hole 155. Since the electrical connection hole 155 is located on the first conductive line 151, the conductive platform 163 is electrically connected to the first conductive line 151 through the conductive mounting part 1632.

[0133] This voltage loading unit 1 can not only apply reverse bias voltage to various types of solar cells, but also to solar cells of various specifications, as detailed below:

[0134] Optionally, refer to Figure 8 and Figure 9 The second mounting substrate 15 has various specifications and is configured to select the appropriate specification according to the specifications of the solar cell to be contacted. The specifications of the solar cell to be contacted include whole solar cells 7c and sliced ​​solar cells 7d. Sliced ​​solar cells 7d can be half-cell solar cells or one-third-cell solar cells, etc. For example, in... Figure 8 In this context, the solar cell to be contacted is a 7c full-cell solar cell, and the second mounting substrate 15 has a dimension of L1. Figure 8 In this design, the solar cell to be contacted is a 7d sliced ​​solar cell, and the second mounting substrate 15 has a size of L2. Where L1 is larger than L2.

[0135] Optionally, refer to Figure 10 and Figure 11 The conductive platform 163 has various specifications and is configured to be mounted on the second mounting base 15 according to the specifications of the bifacial electrode solar cell to be contacted. The specifications of the bifacial electrode solar cell include whole solar cells 7c and sliced ​​solar cells 7d. Sliced ​​solar cells 7d are, for example, half-cell bifacial electrode solar cells or one-third-cell bifacial electrode solar cells. For example, in... Figure 10 In this context, the specifications of the bifacial electrode solar cell to be contacted are a 7c whole solar cell, and the size of the conductive platform 163 is L3. Figure 11 In this design, the bifacial electrode solar cell to be contacted is a 7d sliced ​​solar cell, and the conductive platform 163 has a size of L4. Where L3 is larger than L4.

[0136] Secondly, such as Figure 12 As shown in the figure, this application discloses a laser-induced sintering apparatus, including a plurality of voltage loading units 1 as described in the first aspect and a plurality of lasers 2.

[0137] Each laser 2 is configured to perform laser-induced sintering of the solar cell located between the second contact component 10b and the first contact component 10a of each voltage loading unit 1.

[0138] During the laser-induced sintering (LIF) process, voltage loading unit 1 applies a reverse bias voltage to the solar cell, and laser 2 emits laser light to the solar cell. Under the action of reverse bias voltage and laser scanning, the solar cell forms a local high-density current. The high temperature generated by the local high-density current promotes the interdiffusion of the metal components of the electrode with silicon, forming a contact structure that improves contact.

[0139] The voltage loading unit 1 of the laser-induced sintering equipment can apply reverse bias voltage to various types of solar cells, thereby enabling laser-induced sintering of various types of solar cells and making it more adaptable.

[0140] Preferably, such as Figure 12 As shown, laser 2 is located above voltage loading unit 1. During processing, the solar cell is placed in voltage loading unit 1, and laser 2 emits laser light downwards to scan the solar cell, completing laser-induced sintering. Compared to other emission directions, laser 2 emitting laser light downwards provides higher processing safety.

[0141] Optionally, combined Figure 12 and Figure 13 There are two voltage loading units 1 and two lasers 2, with each voltage loading unit 1 corresponding to each laser 2. The pressing contact 12 of each voltage loading unit 1 is a hollow pressing part, and each hollow pressing part has a hollow part 121. The shapes of the two hollow parts 121 are complementary to each other.

[0142] The term "complementary shape" refers to the complementary shapes of the cutouts 121 of two hollowed-out pressed parts, which can be assembled into a complete shape. For example, in Figure 13 In the first hollowed-out pressed part, the hollowed-out portion 121 is located in the middle, and the hollowed-out portion 121 is square in shape. The middle part of the second hollowed-out pressed part is a square solid portion, and the solid portion of the second hollowed-out pressed part has the same shape as the hollowed-out portion 121 of the first hollowed-out pressed part. The hollowed-out portions 121 of the second hollowed-out pressed part are located on both sides of the middle solid portion, and the hollowed-out portions 121 of the second hollowed-out pressed part have the same shape as the solid portion of the first hollowed-out pressed part. In this way, the hollowed-out portions 121 of the first and second hollowed-out pressed parts can be combined to form a square.

[0143] Understandably, when the laser-induced sintering equipment has only one voltage loading unit 1 and one laser 2, because the cutout portion 121 exposes a portion of the front side of the back-contact solar cell, the laser 2 needs to scan the solar cell through the cutout portion 121. That is, the laser 2 can only scan a portion of the front side of the back-contact solar cell, and the remaining front side of the back-contact solar cell is not scanned. In other words, this laser-induced sintering equipment forms two sintering mechanisms by setting two voltage loading units 1 and two lasers 2. The first laser 2 scans a portion of the front side of the back-contact solar cell through the cutout portion 121 of the first cutout pressing component, and the second laser 2 scans the remaining unscanned front side of the back-contact solar cell through the cutout portion 121 of the second cutout pressing component, further improving the sintering effect and ensuring that the back-contact solar cell is fully sintered.

[0144] In some embodiments, referencing the back Figure 12 The laser-induced sintering equipment also includes several wafer transfer mechanisms 3. Optionally, there are two wafer transfer mechanisms 3, each corresponding to a voltage loading unit 1. Each wafer transfer mechanism 3 is used to load and unload solar cells into each voltage loading unit 1.

[0145] Optionally, refer to Figure 14 Each solar cell transfer mechanism 3 includes several adsorption components 31 and a displacement driving component 32. The adsorption components 31 are configured to adsorb solar cells and can be suction cups or nozzles. The adsorption components 31 are driven by the displacement driving component 32, which can be a robotic arm, a lead screw and nut mechanism, a linear motor, etc. The displacement driving component 32 is configured to drive the adsorption components 31 to move relative to the voltage loading unit 1. The adsorption components 31 have a first transfer position, and the adsorption components 31 at the first transfer position are correspondingly arranged with the voltage loading unit 1. At this first transfer position, the solar cell can be transferred from the adsorption components 31 to the voltage loading unit 1, or vice versa.

[0146] Reference Figure 14 The displacement drive assembly 32 includes a motor 321, a slide rail 322, a slide table 323, and a cylinder 324. The motor 321 drives the slide table 323. Exemplarily, the motor 321 is driven to the slide table 323 via a transmission belt. As other examples, the motor can also be driven to the slide table via a lead screw and nut assembly, a gear and rack assembly, or a worm gear assembly. The slide table 323 is slidably connected to the slide rail 322, and the motor 321 is configured to drive the slide table 323 to move laterally along the slide rail 322. The cylinder 324 is disposed on the slide table 323, and a plate transfer bracket 311 is connected to the cylinder 324, for example, the plate transfer bracket 311 is connected to the piston rod of the cylinder 324, and the cylinder 324 drives the plate transfer bracket 311 to move vertically. As other examples, the displacement drive assembly can also drive the plate transfer bracket to move vertically via a hydraulic cylinder, an electric telescopic rod, etc.

[0147] Optionally, please combine Figures 14 to 16 The adsorption assembly 31 includes a transfer bracket 311 and several suction nozzle kits 312. The transfer bracket 311 is drivenly connected to a displacement driving assembly 32, which is configured to drive the transfer bracket 311 to move laterally and vertically. "Laterally" can refer to a horizontal direction or a direction inclined to the horizontal direction, such as... Figure 14 The X-axis direction is shown. "Vertical" can be the vertical direction or a direction inclined to the vertical direction, such as... Figure 14 The Z-axis direction is shown. The inner circumference of the transfer bracket 311 defines a clearance 313, the size of which is larger than the size of the second contact assembly 10b. Each nozzle kit 312 is disposed on the transfer bracket 311 and extends into the clearance 313. The transfer bracket 311 in the first transfer position is configured to move vertically relative to the second contact assembly 10b via the clearance 313, so that the solar cell can be transferred between the nozzle kit 312 and the second contact assembly 10b.

[0148] In short, the transfer bracket 311 shifts laterally, thereby transferring solar cells from other positions to the first transfer position. At the first transfer position, the transfer bracket 311 is vertically opposite the second contact assembly 10b. The transfer bracket 311 achieves the transfer of solar cells by shifting vertically relative to the second contact assembly 10b. For example, when the second contact assembly 10b rises, the transfer bracket 311, by avoiding the gap 313, fits onto the outer periphery of the second contact assembly 10b, and the solar cells on the transfer bracket 311 are transferred to the second contact assembly 10b. After laser-induced sintering is completed, the second contact assembly 10b descends, and the solar cells are transferred from the second contact assembly 10b to the transfer bracket 311, continuing to be transferred to the next station.

[0149] like Figure 15 and Figure 16 As shown, the nozzle kit 312 has multiple lengths and is configured to select the appropriate length according to the specifications of the solar cell to be adsorbed, including whole solar cell 7c and sliced ​​solar cell 7d.

[0150] For example, such as Figure 15 and Figure 16As shown, the nozzle assembly 312 includes a nozzle mounting member 3121 and a nozzle 3122 disposed on the nozzle mounting member 3121. The nozzle mounting member 3121 is detachably mounted on the transfer bracket 311, for example, by means of screwing, magnetic attraction, or tight fitting. The nozzle mounting member 3121 is configured to select an appropriate length according to the specifications of the solar cell to be adsorbed. When the solar cell to be transferred is a whole solar cell 7c, the length of the nozzle mounting member 3121 is L5; when the solar cell to be transferred is a sliced ​​solar cell 7d, the length of the nozzle mounting member 3121 is L6, and L6 is greater than L5.

[0151] As another example, the nozzle kit includes a nozzle mount and a nozzle disposed on the nozzle mount. The length of the nozzle mount is telescopic and is configured to be selected according to the specifications of the solar cell to be adsorbed.

[0152] Reference Figure 15 and Figure 16 Since the suction nozzle 3122 needs to adhere to the two opposite edges of the solar cell to facilitate its transfer, it's understandable that different sizes of solar cells vary, and the edge of the whole solar cell 7c will be closer to the transfer bracket 311 than the edge of the sliced ​​solar cell 7d. Accordingly, the suction nozzle kit 312 needs to have multiple lengths. For example, the suction nozzle kit 312 can have two lengths: a longer suction nozzle kit 312 and a shorter suction nozzle kit 312. The longer suction nozzle kit 312 is used to adhere to the sliced ​​solar cell 7d, and the shorter suction nozzle kit 312 is used to adhere to the whole solar cell 7c. Alternatively, the suction nozzle mounting part 3121 of the suction nozzle kit 312 can be a telescopic rod, whose length can be adjusted according to the specifications of the solar cell to be adhered to, so that the suction nozzle 3122 adheres precisely to the edge of the solar cell.

[0153] In some embodiments, referencing the back Figure 14 and combined Figure 17 and Figure 18 Each solar cell transfer mechanism 3 also includes several conveyor belts 4, each conveyor belt 4 comprising two drive rods 41 and two transmission belts 42. The two drive rods 41 are arranged opposite to each other. The two ends of each transmission belt 42 are movably connected to the two drive rods 41 respectively in the longitudinal direction. The spacing between the two transmission belts 42 is configured to be adjusted according to the specifications of the solar cells to be transported and to transport the solar cells laterally. The specifications of the solar cells include whole solar cells 7c and sliced ​​solar cells 7d. It can be understood that the conveyor belts 4 can transport solar cells of different specifications.

[0154] The adsorption component 31 also has several second transfer positions. The adsorption component 31 located at these second transfer positions is vertically opposite to the conveyor belt 42, allowing the solar cells to be transferred between the conveyor belt 42 and the adsorption component 31. It can be understood that the adsorption component 31 cooperates with the conveyor belt 42 to achieve the transfer of the solar cells.

[0155] Reference Figure 14 In the horizontal direction, the wafer transfer bracket 311 has clearance recesses 3111 on two opposite sides. The clearance recesses 3111 are configured to avoid the conveyor belt 42 when the wafer transfer bracket 311 is displaced vertically. The clearance recesses 3111 allow the wafer transfer bracket 311 and the conveyor belt 42 to engage vertically, so that the solar cells can be transferred between the wafer transfer bracket 311 and the conveyor belt 42.

[0156] Reference Figure 14 The laser-induced sintering equipment also includes an illumination device 5 and an imaging device 6. When the wafer transfer bracket 311 is in the second transfer position, the illumination device 5 is located below the wafer transfer bracket 311, and the imaging device 6 is located above the wafer transfer bracket 311. The illumination device 5 is, for example, a light board, used for supplemental lighting to make the imaging device 6 capture clearer images. The imaging device 6 is used to photograph the solar cell and obtain its contour parameters; the imaging device 6 is, for example, an industrial camera.

[0157] Reference Figure 14 Each solar cell transfer mechanism 3 has two conveyor belts 4, which are respectively positioned on opposite sides of the voltage loading unit 1. The adsorption component 31 has two second transfer positions, and the adsorption component 31 at each second transfer position is vertically opposite to the transmission belt 42 of each conveyor belt 4. It can be understood that one conveyor belt 4 in each solar cell transfer mechanism 3 is used for loading and unloading solar cells. At the first second transfer position, the adsorption component 31 removes the solar cells from the conveyor belt 4 used for loading and unloading, and at the second second transfer position, the adsorption component 31 transfers the solar cells adsorbed thereon to the conveyor belt 4 used for unloading.

[0158] Optionally, refer to Figure 17 and Figure 18 Each transmission rod is provided with two opposing first pulleys 43 and two opposing second pulleys 44, and each second pulley 44 is respectively arranged on the outside of each first pulley 43.

[0159] The conveyor belt 42 is configured to connect to either the two first pulleys 43 or the two second pulleys 44, depending on the specifications of the solar cells to be conveyed. More specifically, when the solar cell specification is a whole solar cell 7c, both ends of each conveyor belt 42 are connected to the two second pulleys 44 respectively. When the solar cell specification is a sliced ​​solar cell 7d, both ends of each conveyor belt 42 are connected to the two first pulleys 43 respectively. This conveyor belt 4 can be used to convey solar cells of various specifications with simple modifications.

[0160] Refer to the return Figure 14 The working process of this laser-induced sintering equipment is described below:

[0161] Material feeding and conveying: The solar cells are placed on the conveyor belt 4 used for feeding. The conveyor belt 4 is pre-installed with a transmission belt according to the specifications of the solar cells to be transported, as described in detail above, and will not be repeated here. The conveyor belt 4 transports the solar cells to the position that mates with the cell transfer bracket 311 and then stops.

[0162] Photography: After the solar cell stops transmitting, the lighting device 5 is turned on to provide supplemental lighting, and the photography device 6 photographs the solar cell to obtain its contour parameters. These contour parameters are used to adjust the position and angle of the second contact component 10b.

[0163] Suction nozzle adsorption: The motor 321 of the displacement drive assembly 32 pre-drives the transfer bracket 311 to move laterally to the second transfer position. The transfer bracket 311 at the second transfer position is located below the solar cell on the conveyor belt 42. The suction nozzle kit 312 on the transfer bracket 311 is also pre-selected according to the specifications of the solar cell and is detachably installed on the transfer bracket 311, as described in detail above. The suction nozzle kit 312 adsorbs the solar cell onto the transfer bracket 311. The cylinder 324 of the displacement drive assembly 32 drives the transfer bracket 311 to rise vertically until the top surface of the transfer bracket 311 is higher than the top surface of the conveyor belt 42. The solar cell on the conveyor belt 42 is transferred to the transfer bracket 311. The motor 321 of the displacement drive assembly 32 then drives the transfer bracket 311 to move laterally to the first transfer position.

[0164] Material transfer: The transfer bracket 311 located at the first transfer position is fixed, and the second movable frame drives the second contact component 10b to rise until the top surface of the transfer bracket 311 is lower than the top surface of the second contact component 10b, and the solar cell is transferred from the transfer bracket 311 to the second contact component 10b.

[0165] Laser-induced sintering: The second contact component 10b is pre-installed on the second movable frame using a second mounting base 15 of the appropriate specifications according to the specifications of the solar cell to be contacted. The second contact component 10b is also pre-installed on the second mounting base 15 using a second electrode contact kit of the appropriate type according to the type of solar cell to be contacted. The first contact component 10a is installed on the first mounting base using a contact accessory of the appropriate type of solar cell to be contacted. The above process has been described in detail above and will not be repeated here. The first contact component 10a approaches the second contact component 10b until the solar cell is sandwiched between the first contact component 10a and the second contact component 10b. An external power supply applies a bias voltage to the solar cell through the voltage loading unit 1, while the laser 2 scans the solar cell, completing the laser-induced sintering.

[0166] Material transfer: After laser-induced sintering is completed, the second movable frame drives the second contact component 10b to descend until the top surface of the transfer bracket 311 is higher than the top surface of the second contact component 10b, and the solar cell is transferred from the second contact component 10b to the transfer bracket 311.

[0167] Material feeding and conveying: The motor 321 of the displacement drive assembly 32 drives the transfer bracket 311 to move laterally to the next second transfer position. The transfer bracket 311 and the conveyor belt 4 for feeding are vertically aligned. The cylinder 324 of the displacement drive assembly 32 drives the transfer bracket 311 to descend vertically. The suction nozzle kit 312 breaks the vacuum, and the solar cells on the transfer bracket 311 are transferred to the conveyor belt 4 for feeding. The conveyor belt 4 feeds and conveys the solar cells.

[0168] When the laser-induced sintering equipment has two voltage loading units, a laser, and a wafer transfer mechanism, the upper wafer transfer mechanism transfers the solar cell to the conveyor belt of the next wafer transfer mechanism. The conveyor belt of the next wafer transfer mechanism repeats the above-mentioned feeding and transfer steps. The solar cell repeats the above processing process once to achieve more comprehensive sintering of the solar cell.

[0169] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A voltage loading unit, characterized in that, include: A first contact assembly includes a first mounting base and contact accessories. The contact accessories are detachably mounted on the first mounting base. The contact accessories are of various types and are configured to be mounted on the first mounting base according to the type of solar cell to be contacted. The types of solar cells include back-contact solar cells and bifacial electrode solar cells. A first type of contact accessory is a press-fit contact configured to press-fit against the front side of the back-contact solar cell. A second type of contact accessory is a first electrode contact kit configured to conductively contact the electrode on the other side of the bifacial electrode solar cell. as well as The second contact assembly is configured to make conductive contact with the electrodes of the back contact solar cell and the electrodes on one side of the bifacial electrode solar cell.

2. The voltage loading unit according to claim 1, characterized in that, The second contact component includes: A second mounting base, wherein a first conductive line and a second conductive line are provided on the second mounting base, wherein one of the first conductive line and the second conductive line is a positive terminal line and the other is a negative terminal line; and The second electrode contact kit is detachably mounted on the second mounting base. The second electrode contact kit has several types and is configured to be mounted on the second mounting base according to the type of solar cell to be contacted. A first type of second electrode contact kit is partially electrically connected to the first conductive line and partially electrically connected to the second conductive line, and is configured to conductively contact the electrode on the back side of the back contact solar cell. A second type of second electrode contact kit is electrically connected to the first conductive line and is configured to conductively contact the electrode on one side of the bifacial solar cell.

3. The voltage loading unit according to claim 2, characterized in that, The first type of second electrode contact kit includes: A plurality of first probes, wherein the plurality of first probes are detachably mounted on the second mounting base and electrically connected to the first conductive line; and A plurality of second probes, wherein the plurality of second probes are detachably mounted on the second mounting base and electrically connected to the second conductive line; The first probe and the second probe are configured to make conductive contact with the positive and negative electrodes of the back contact solar cell, respectively.

4. The voltage loading unit according to claim 3, characterized in that, The second mounting base is provided with a plurality of first conductive inserts and a plurality of second conductive inserts. Each first conductive insert is electrically connected to the first conductive line, and each second conductive insert is electrically connected to the second conductive line. Each first probe is detachably inserted into each first conductive insert, and each second probe is detachably inserted into each second conductive insert.

5. The voltage loading unit according to claim 3, characterized in that, The press-fit contact is a hollow press-fit component, which has a hollow portion that is configured to expose a portion of the front side of the back contact solar cell. When the hollowed-out pressing component is disposed opposite to the second mounting base, in the relative direction between the hollowed-out pressing component and the second mounting base, the area of ​​the hollowed-out portion projected onto the second mounting base is offset from the setting areas of the first probe and the second probe.

6. The voltage loading unit according to claim 2, characterized in that, The second type of the second electrode contact kit includes: A conductive platform is detachably mounted on the second mounting base and electrically connected to the first conductive line, the conductive platform being configured to make conductive contact with an electrode on one side of the bifacial electrode solar cell.

7. The voltage loading unit according to claim 6, characterized in that, The conductive platform is provided with an insulating support member, which is configured to abut against the second mounting base so that the conductive platform is mounted on the second mounting base and isolated from the second conductive line; And / or, the conductive platform is provided with a conductive mounting part, the second mounting base is provided with an electrical connection hole, the electrical connection hole is located on the first conductive line, the conductive mounting part is detachably mounted on the electrical connection hole, and the conductive mounting part is configured to be electrically connected to the first conductive line when connected to the electrical connection hole; And / or, the conductive platform has a bonding surface configured to bond with the bifacial electrode solar cell, and the bonding surface has through holes; And / or, the conductive platform has a clearance notch on its edge; And / or, the conductive platform has multiple specifications, and the conductive platform is configured to select the appropriate specification according to the specifications of the bifacial electrode solar cell to be contacted and install it on the second mounting substrate, the specifications of the bifacial electrode solar cell including whole solar cell and sliced ​​solar cell.

8. The voltage loading unit according to claim 2, characterized in that, The second contact assembly further includes a second movable frame, on which the second mounting base is detachably mounted. The second movable frame is configured to drive the second mounting base to displace vertically and in two intersecting lateral directions and to rotate about a vertical axis. The two intersecting lateral directions form a displacement plane, and the vertical axis is perpendicular to the displacement plane. And / or, the second mounting base has multiple specifications, and the second mounting base is configured to select the appropriate specification according to the specifications of the solar cell to be contacted, the specifications of the solar cell to be contacted include whole solar cells and sliced ​​solar cells. And / or, the second mounting base is a mounting plate.

9. The voltage loading unit according to any one of claims 1 to 8, characterized in that, The first electrode contact kit includes: A fixed frame is provided with sliding grooves on both opposite sides of the fixed frame, and the fixed frame can be detachably installed on the first mounting base; A probe array, wherein the two ends of the probe array are slidably connected to the two grooves respectively; and A plurality of third probes are disposed on the probe array, the third probes being configured to make conductive contact with an electrode on one surface of the bifacial electrode solar cell.

10. The voltage loading unit according to any one of claims 1 to 8, characterized in that, The press-fit contact is a hollow press-fit component, which has a hollow portion. The hollow press-fit component is configured to press-fit a portion of the front side of the back contact solar cell. The hollow portion is configured to expose a portion of the front side of the back contact solar cell so that a laser can pass through the hollow portion to scan the portion of the front side of the back contact solar cell. And / or, the pressing contact is a perforated glass plate.

11. The voltage loading unit according to any one of claims 1 to 8, characterized in that, The first contact assembly further includes a first movable frame, the first mounting base is connected to the first movable frame, and the first movable frame is configured to drive the first mounting base to displace vertically and in two intersecting lateral directions and to rotate about a vertical axis; wherein the two intersecting lateral directions form a displacement plane, and the vertical axis is perpendicular to the displacement plane; And / or, the first contact component is located above the second contact component; And / or, the first mounting base is a mounting bracket, and either the press-fit contact or the first electrode contact kit is screwed onto the mounting bracket.

12. A laser-induced sintering apparatus, characterized in that, include: Several voltage loading units as described in any one of claims 1 to 11; as well as A plurality of lasers, each laser being configured to perform laser-induced sintering of the solar cell located between a second contact assembly and a first contact assembly of each voltage loading unit.

13. The laser-induced sintering equipment according to claim 12, characterized in that, The laser-induced sintering equipment further includes several wafer transfer mechanisms, each of which includes: A plurality of adsorption components, the adsorption components being configured to adsorb the solar cells; and A displacement driving component is provided, wherein the adsorption component is driven to connect to the displacement driving component, the displacement driving component is configured to drive the adsorption component to move relative to the voltage loading unit, the adsorption component has a first transfer position, and the adsorption component located at the first transfer position is correspondingly disposed to the voltage loading unit.

14. The laser-induced sintering equipment according to claim 13, characterized in that, The adsorption assembly includes a plate transfer bracket and several suction nozzle kits; The plate transfer bracket is driven by the displacement driving component, which is configured to drive the plate transfer bracket to move in the lateral and vertical directions. The inner periphery of the transfer bracket defines a clearance space, the size of which is larger than the size of the second contact component; each of the nozzle kits is disposed on the transfer bracket and extends into the clearance space, and the transfer bracket located at the first transfer position is configured to move relative to the second contact component in the vertical direction through the clearance space, so as to transfer the solar cell between the nozzle kit and the second contact component; The nozzle kit has multiple lengths and is configured to select the appropriate length according to the specifications of the solar cell to be adsorbed, including whole solar cells and sliced ​​solar cells.

15. The laser-induced sintering equipment according to claim 14, characterized in that, The nozzle kit includes a nozzle mounting component and a nozzle disposed on the nozzle mounting component. The nozzle mounting component is detachably mounted on the transfer plate bracket. The nozzle mounting component has multiple lengths and is configured to select the appropriate length according to the specifications of the solar cell to be adsorbed. Alternatively, the nozzle kit includes a nozzle mounting component and a nozzle disposed on the nozzle mounting component. The nozzle mounting component is mounted on the transfer plate support. The length of the nozzle mounting component is extendable and is configured to select an appropriate length according to the specifications of the solar cell to be adsorbed. And / or, the displacement drive assembly includes a motor, a slide rail, a slide table, and a cylinder, wherein the motor is driven and connected to the slide table, the slide table is slidably connected to the slide rail, the motor is configured to drive the slide table to move laterally along the slide rail, the cylinder is disposed on the slide table, the plate transfer bracket is connected to the cylinder, and the cylinder drives the plate transfer bracket to move vertically. And / or, the nozzle kit is in two sets, with the two sets of nozzle kits respectively disposed on two opposite sides of the transfer plate bracket.

16. The laser-induced sintering equipment according to claim 14, characterized in that, Each of the aforementioned film transfer mechanisms further includes a plurality of conveyor belts, each of the aforementioned conveyor belts comprising: Two transmission rods, the two transmission rods being arranged opposite each other; and Two conveyor belts are provided, with two drive rods movably connected to both ends of each conveyor belt along its length. The distance between the two conveyor belts is configured to be adjusted according to the specifications of the solar cells to be conveyed, and the solar cells are conveyed along the transverse direction. The specifications of the solar cells include whole solar cells and sliced ​​solar cells. The adsorption component also has several second transfer positions, and the adsorption component located at the second transfer position is arranged opposite to the transport belt in the vertical direction so that the solar cell is transferred between the transport belt and the adsorption component.

17. The laser-induced sintering equipment according to claim 16, characterized in that, In the lateral direction, the plate carrier is provided with clearance recesses on two opposite sides, and the clearance recesses are configured to avoid the transmission belt when the plate carrier is displaced in the vertical direction; And / or, the laser-induced sintering equipment further includes an illumination device and an imaging device. When the wafer transfer bracket is located in the second transfer position, the illumination device is located below the wafer transfer bracket, and the imaging device is located above the wafer transfer bracket. And / or, the number of conveyor belts in each of the sheet transfer mechanisms is two, the two conveyor belts are respectively arranged on two opposite sides of the voltage loading unit, the adsorption component has two second transfer positions, and the adsorption component located at each of the second transfer positions is arranged opposite to the transmission belt of each of the conveyor belts in the vertical direction.

18. The laser-induced sintering equipment according to claim 16, characterized in that, Each of the transmission rods is provided with two opposing first pulleys and two opposing second pulleys, with each second pulley respectively disposed on the outer side of each of the first pulleys; The transport belt is configured to connect to either the two first pulleys or the two second pulleys, depending on the specifications of the solar cells to be transported.

19. The laser-induced sintering apparatus according to any one of claims 13 to 18, characterized in that, The number of voltage loading units and lasers are both two, and each voltage loading unit is respectively set to correspond to each laser; the pressing contact of each voltage loading unit is a hollow pressing part, and each hollow pressing part has a hollow part, and the shapes of the two hollow parts are complementary to each other. And / or, the number of the wafer transfer mechanism is two, and each wafer transfer mechanism is configured corresponding to each voltage loading unit; And / or, the laser is located above the voltage-loaded unit.

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