Laser-induced sintering processing device of back contact battery

Abstract

The utility model provides a laser-induced sintering processing device of a back contact battery, which comprises a bearing device, the bearing device comprises a bearing table, the laser-induced sintering processing device is provided with a processing station, and an electric input module and a laser processing module are arranged corresponding to the processing station. The electric input module comprises a first electrode and a second electrode which are located below the bearing face of the bearing table and used for being electrically connected with a positive electrode and a negative electrode of the back contact battery respectively, the laser machining module is located above the bearing table, and the bearing table comprises a hollow part allowing the first electrode and the second electrode to penetrate through. The laser-induced sintering processing device further comprises a positioning station arranged on the upstream of the processing station, and a visual positioning mechanism located below the bearing face of the bearing table is arranged on the positioning station and used for obtaining position information of a grid line or a PAD point or a MARK point on the back face of the back contact battery so as to improve the processing precision. According to the laser-induced sintering processing device, the photoelectric conversion efficiency of the back contact battery can be improved.

Description

Technical Field

[0001] The present application belongs to the technical field of photovoltaic cells, and specifically, relates to a laser induced sintering device for a back contact cell. Background Art

[0002] The contact resistance between the electrodes of crystalline silicon solar cells has a great influence on the fill factor and conversion efficiency. The lower the contact resistance, the higher the fill factor and conversion efficiency. Reducing the contact resistance has become an urgent need for major battery manufacturers. In order to reduce the contact resistance, the applicant uses laser induced sintering technology to excite battery carriers through lasers and promote the mutual diffusion of metals and silicon wafers under the action of the reverse voltage of the external electric field, thereby obtaining excellent contact characteristics after sintering.

[0003] Among them, when using laser induced sintering technology, electrodes are needed to electrically contact the positive electrode and the negative electrode of the battery cell respectively in order to apply voltage to the battery cell. For back-contact battery cells, since the positive electrode and the negative electrode on the battery cell are all located on the back side and the number of electrodes on the battery cell is dense, how to better improve the alignment accuracy of the back-contact battery and improve the processing effect is a technical problem that needs to be solved. Utility Model Content

[0004] The present application provides a laser induced sintering processing device for a back contact battery, comprising a carrying device, wherein the carrying device comprises a carrying platform for carrying the back contact battery, the laser induced sintering processing device has a processing station, and an electric input module and a laser processing module are arranged corresponding to the processing station, the electric input module comprises a first electrode and a second electrode, the first electrode and the second electrode are respectively used to be electrically connected to the positive electrode and the negative electrode of the power supply, and the first electrode and the second electrode are also respectively used to be electrically connected to the positive electrode and the negative electrode of the back contact battery, the laser processing module emits a laser beam to scan the battery sheet when a reverse voltage is applied to the back contact battery,

[0005] The laser processing module is located above the carrier platform, the first electrode and the second electrode are located below the carrier surface of the carrier platform, and the carrier platform includes a hollow portion for the first electrode and the second electrode to pass through;

[0006] The laser induced sintering processing device also includes a positioning station arranged upstream of the processing station, and a visual positioning mechanism is arranged at the positioning station. The visual positioning mechanism is located below the supporting surface of the supporting platform to obtain the position information of the grid line or PAD point or MARK point on the back side of the back contact battery.

[0007] Furthermore, the support platform also includes a support, and a plurality of suction nozzles made of flexible material are arranged on the support, or at least the surface of the support is made of flexible material, and an adsorption channel is opened on the support to adsorb the battery sheet.

[0008] Furthermore, the laser processing module obtains the position data of the grid lines or PAD points or MARK points on the back side of the back contact battery according to the visual positioning mechanism, and controls the laser beam to scan along the grid lines of the battery cell or perpendicular to the grid lines of the battery cell.

[0009] Furthermore, a glass protective cover is provided on the surface of the visual positioning mechanism and / or an air blowing component is provided on the side of the visual positioning mechanism.

[0010] Furthermore, the first electrode and the second electrode each include a plurality of rows of strip electrodes arranged along a first direction, each row of the strip electrodes is arranged along a second direction, and the second direction is perpendicular to the first direction;

[0011] There are multiple carriers, each of which is strip-shaped. The strip-shaped carriers are extended along the second direction, and multiple carriers are arranged in sequence along the first direction. Multiple carriers are arranged between the hollow parts so that the hollow parts are divided into multiple hollow units, and the strip-shaped electrodes pass through the hollow units.

[0012] Furthermore, the strip electrode is a probe row, which includes a plurality of probes arranged in a collinear manner, and the sum of the number of probes in the first electrode and the number of probes in the second electrode corresponds to the number of all preset gate line contact points on the back side of the back contact cell.

[0013] Furthermore, the first electrode and the second electrode each include a plurality of probes, and the electrical input module also includes a PCB board arranged below the first electrode and the second electrode, all the probes are connected to the PCB board, and the PCB board is connected to two wiring points, which are respectively electrically connected to the positive and negative poles of the power supply.

[0014] Furthermore, strip-shaped mounting holes are provided on the bearing platform at positions corresponding to the two ends of the bearing member, and the bearing member is movably mounted in the strip-shaped mounting holes so as to adjust the position of the bearing member.

[0015] Furthermore, the electrical input module also includes a longitudinal displacement mechanism and a horizontal position adjustment mechanism connected to the longitudinal displacement mechanism through a first frame, the first electrode and the second electrode are connected to the horizontal position adjustment mechanism, and the horizontal position adjustment mechanism is used to adjust the positions of the first electrode and the second electrode in the horizontal plane at the same time.

[0016] Furthermore, a supporting device is also provided at the processing station, and the supporting device is located below the laser processing module and above the supporting platform. The supporting device includes a transparent supporting plate and a lifting mechanism connected to the transparent supporting plate, and the lifting mechanism drives the transparent supporting plate to move closer to or away from the supporting platform. The transmittance of the transparent supporting plate to the laser beam emitted by the laser processing module is more than 95%.

[0017] Furthermore, the transparent support plate is provided with a plurality of exhaust holes.

[0018] Furthermore, the transparent support plate is glass.

[0019] Furthermore, the support device also includes a bracket connected to the lifting mechanism, a support plate fixing frame connected to the bracket, and a clamping mechanism;

[0020] The clamping mechanism includes a support plate locking strip and a locking piece arranged on the inner side of the support plate fixing frame. The support plate fixing frame and the support plate locking strip are respectively provided with a hole one and a hole two, and the hole one is connected with the hole two. The support plate fixing frame is used to support the transparent support plate. The locking piece is installed in the hole one and the hole two. The support plate locking strip fixes and locks the transparent support plate to the support plate fixing frame through the locking piece.

[0021] Furthermore, the support device also includes a bracket connected to the lifting mechanism, a support plate fixing frame connected to the bracket, and a buffer mechanism;

[0022] The buffer mechanism includes a first support member relatively connected to the bracket, a second support member slidably connected to the first support member, the second support member is connected to the support plate fixing frame, and an elastic member is arranged between the first support member and the second support member in the vertical direction.

[0023] Furthermore, the support device also includes a bracket connected to the lifting mechanism, a support plate fixing frame connected to the bracket, and a leveling mechanism;

[0024] The leveling mechanism comprises an adjustment frame in a horizontal posture and leveling members arranged at four corners of the adjustment frame, and the adjustment frame is locked above the support plate fixing frame through the leveling members.

[0025] Furthermore, the transparent support plate is composed of a plurality of strip-shaped transparent members arranged in parallel, and positions of the strip-shaped transparent members coincide with projections of the first electrode and the second electrode on a horizontal plane.

[0026] Furthermore, the carrying device is a turntable module, the turntable module includes a rotation drive mechanism and a plurality of the carrying platforms connected to the periphery of the rotation drive mechanism, and the rotation drive mechanism is used to drive the carrying platforms to rotate through the processing stations.

[0027] Furthermore, the number of the carrier platforms is four, and the extension directions of the carriers on adjacent carrier platforms are perpendicular to each other. The laser induced sintering processing device has a loading and positioning station, a preparatory function station, a processing station, and a unloading station which are arranged in sequence. A visual positioning mechanism is arranged below the carrying surface of the carrier platform corresponding to the loading and positioning station, and the rotary drive mechanism drives the carrier platform to pass through the loading and positioning station, the preparatory function station, the processing station, and the unloading station in sequence.

[0028] Compared with the prior art, the laser induced sintering processing device for back-contact cells proposed in the present application arranges the first electrode and the second electrode below the bearing surface of the carrier, that is, the first electrode and the second electrode contact the back of the back-contact cell, so that the laser beam will not be blocked by the first electrode and the second electrode when scanning the cell from the front of the back-contact cell, thereby improving the photoelectric conversion efficiency of the back-contact cell. And by arranging the visual positioning mechanism below the bearing surface of the carrier, after obtaining the position information of the grid line or PAD point on the back of the cell, it is convenient for the first electrode and the second electrode to align and contact the grid line or PAD point on the back of the cell, so as to improve the processing accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the related technologies, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0030] The structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with this technology. They are not used to limit the conditions under which this application can be implemented, and therefore have no substantive technical significance. Any structural modification, change in proportion or adjustment of size, without affecting the effects and purposes that can be achieved by this application, should still fall within the scope of the technical contents disclosed in this application.

[0031] Figure 1 A schematic diagram of the structure of a laser induced sintering processing device for a back contact battery according to an embodiment provided in the present application.

[0032] Figure 2 A schematic diagram of the structure of an electric input module according to an embodiment of the present application.

[0033] Figure 3 This is a schematic diagram of the structure of the support device according to the embodiment provided in the present application.

[0034] Figure 4 A schematic structural diagram of a laser induced sintering processing device for a back contact battery according to another embodiment provided in the present application.

[0035] Figure 5 A schematic diagram of the structure of a clamping mechanism according to an embodiment of the present application.

[0036] Figure 6 A schematic diagram of the structure of a visual positioning mechanism according to an embodiment of the present application. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the embodiments in the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0038] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0039] like Figure 1 , Figure 4As shown, the present application proposes a laser induced sintering processing device for a back-contact battery, including a carrying device 100, the carrying device 100 includes a carrying table 110 for carrying the back-contact battery, the laser induced sintering processing device has a processing station B, and an electric input module 200 and a laser processing module 300 are provided corresponding to the processing station B, the electric input module 200 includes a first electrode and a second electrode, the first electrode and the second electrode are respectively used to be electrically connected to the positive electrode and the negative electrode of the power supply, and the first electrode and the second electrode are also respectively used to be electrically connected to the positive electrode and the negative electrode of the back-contact battery, and the laser processing module 300 is provided at the back contact The contact battery is applied with a reverse voltage while emitting a laser beam to scan the battery cell; wherein the laser processing module 300 is located above the carrier 110, the first electrode and the second electrode are located below the bearing surface of the carrier 110, and the carrier 110 includes a hollow portion 111 for the first electrode and the second electrode to pass through; the laser induced sintering processing device also includes a positioning station arranged upstream of the processing station B, and a visual positioning mechanism 410 is arranged at the positioning station, and the visual positioning mechanism 410 is located below the bearing surface of the carrier 110 to obtain the position information of the grid line or PAD point or MARK point on the back of the back contact battery. In other words, the carrier 110 first moves to the positioning station to obtain the position information of the grid line or PAD point or MARK point on the back of the battery cell through the visual positioning mechanism 410, and then moves to the processing station B for laser induced sintering processing. After obtaining the position information through the visual positioning mechanism 410, it is convenient for the first electrode and the second electrode to align the grid line or PAD point on the back of the contact battery cell to improve the processing accuracy. Wherein, the visual positioning mechanism 41 includes but is not limited to a CCD camera.

[0040] Furthermore, the visual positioning mechanism 410 is disposed below the hollow portion 111, and the hollow portion 111 may not block the visual positioning mechanism 410 below from taking photos and positioning. It should be noted that when the carrying device 100 is a turntable module described below, the plurality of carrying tables 110 will rotate through the visual positioning mechanism 410 in sequence, but whenever the visual positioning mechanism 410 is located at the station where the visual positioning mechanism 410 is located, the visual positioning mechanism 410 is located below the hollow portion 111.

[0041] The specific position and structure of the first electrode and the second electrode can be described in detail below. It should be noted that the first electrode and the second electrode are used to connect to the positive and negative electrodes of the power supply respectively, which does not mean that the first electrode must only be connected to the positive electrode of the power supply. The first electrode can be connected to the positive or negative electrode of the power supply. When the first electrode is connected to the positive electrode of the power supply, the second electrode is connected to the negative electrode of the power supply. At this time, the first electrode is electrically in contact with the positive electrode on the battery cell, and the second electrode is electrically in contact with the negative electrode of the battery cell; when the first electrode is connected to the negative electrode of the power supply, the second electrode is connected to the positive electrode of the power supply, the first electrode is electrically in contact with the negative electrode on the battery cell, and the second electrode is electrically in contact with the positive electrode on the battery cell. The laser processing module 300 at least includes a laser for emitting a laser beam and a laser scanning mechanism for controlling the scanning direction of the laser beam. The common laser scanning mechanism is composed of a galvanometer plus a field mirror. According to actual needs, the laser processing module 300 can also include other required optical devices. The laser processing module 300 is generally also located above the first electrode and the second electrode.

[0042] The present application arranges the first electrode and the second electrode below the carrying surface of the carrying platform 110, that is, the first electrode and the second electrode contact the back side of the back contact battery, so that the laser beam will not be blocked by the first electrode and the second electrode when scanning the battery cell from the front side of the back contact battery, thereby improving the photoelectric conversion efficiency of the back contact battery.

[0043] In addition, by arranging the first electrode and the second electrode below the carrying surface of the carrying platform 110, laser induced sintering can be completed in one processing station without the problem of electrode blocking the laser. Compared with the solution of processing by two laser processing modules in two processing stations to avoid blocking the laser, the present application does not need to transport the battery cell during processing, which can reduce the error caused by position change and improve the processing accuracy. It can also reduce the calibration error of the laser and the visual positioning mechanism and improve the processing accuracy.

[0044] As another embodiment, the support platform also includes a support member 111, and a plurality of suction nozzles 113 made of flexible material are arranged on the support member 111, or at least the surface of the support member 111 is made of flexible material, and an adsorption channel is opened on the flexible support member 111 to adsorb the battery cells. The battery cells can be prevented from being broken by adsorbing the battery cells with a suction nozzle 113 made of flexible material, such as silica gel. Alternatively, by setting the support member 111 itself to be flexible, the support member 111 can adsorb the battery cells and prevent the battery cells from being broken. Preferably, a plurality of flexible suction nozzles 113 are arranged on the support member 111, and this solution is simple and easy to implement.

[0045] As another embodiment, the laser processing module 300 controls the laser beam to scan along the (thin) grid line direction of the cell or perpendicular to the grid line direction of the cell according to the position data of the grid line or PAD point or MARK point on the back of the back contact cell obtained by the visual positioning mechanism 410. The position data obtained by the visual positioning mechanism 410 makes the scanning accuracy of the cell higher and improves the processing efficiency. More specifically, the laser induced sintering processing device of the back contact cell includes a controller, and the laser processing module 300 and the visual positioning mechanism 410 are electrically connected to the controller respectively, thereby realizing the communication between the laser processing module 300 and the visual positioning mechanism 410.

[0046] It should be noted that the area of ​​the cell scanned by the laser beam in the present application may include only the grid line portion on the cell, or may be the entire area of ​​the cell.

[0047] Furthermore, if Figure 6 As shown, a glass protective cover 420 is provided on the surface of the visual positioning mechanism 410 and / or a blowing assembly 430 is provided on the side of the visual positioning mechanism 410. Because the battery cell is fragile, the falling fragments may cover the lens of the CCD camera, resulting in failure of photographing. Therefore, a glass protective cover 420 is installed above the visual positioning mechanism 410 (the lens of the CCD camera), and / or a blowing assembly 430 is provided on the side of the visual positioning mechanism 410 for blowing protection, so as to ensure that if battery cell fragments are generated, the fragments will not affect photographing.

[0048] As another example, Figure 2 , Figure 4 As shown, the first electrode and the second electrode both include multiple rows of strip electrodes arranged along the first direction, each row of strip electrodes is arranged along the second direction, the second direction is perpendicular to the first direction, wherein the second direction is perpendicular or parallel to the direction of the grid lines on the cell; there are multiple carriers 112, the carriers 112 are strip-shaped, the strip-shaped carriers 112 are extended along the second direction, and multiple carriers 112 are arranged in sequence along the first direction, and multiple carriers 112 are arranged between the hollow portions 111 so that the hollow portions are divided into multiple hollow units, and the strip electrodes pass through the hollow units. Such an arrangement facilitates the multiple strip electrodes in the first electrode and the second electrode to pass through the carrier 110 well.

[0049] Among them, the reason why the first electrode and the second electrode are in the shape of strips is that the grid lines on the battery cell are in the shape of thin and long strips. At this time, the structures of the first electrode and the second electrode can be various, for example, including a probe row structure (i.e., a plurality of probes arranged in a collinear manner are connected on a probe bracket, and the positive electrode and the negative electrode on the back of the battery cell are contacted through the plurality of probes. Preferably, the probe is elastic, and the elastic probe can be in the form of a hollow probe with a spring arranged inside, or a solid probe, and the probe itself is elastic. The probe is set to be elastic to avoid damaging the battery cell), or a conductive wire, or an elongated electrode sheet, etc. Since the first electrode and the second electrode are in the shape of strips, in order to facilitate the first electrode and the second electrode to pass through the carrier 110, the carrier 112 is also in the shape of strips. It should be noted that the grid lines on the back-contact battery are usually arranged in an alternating manner with the positive and negative electrodes, so the first electrode and the second electrode are correspondingly arranged in an alternating manner. Preferably, the first electrode and the second electrode are both in the form of probes, contacting the contact points (PAD points) on the back-contact battery cell.

[0050] As another embodiment, the strip electrode is a probe row, and the probe row includes a plurality of probes arranged in a colinear manner, and the sum of the number of probes in the first electrode and the number of probes in the second electrode is m1, and the number of all preset gate line contact points corresponding to the back side of the back contact battery cell is m2, so as to ensure that each gate line on the back side of the battery cell is contacted by the probe. Among them, the preset gate line contact point refers to the preset welding point of the PAD point or the gate line of the battery cell without the main grid, and the corresponding means that the number of m1 and m2 can be the same or substantially the same, or m1 is greater than m2, in which case it is possible for one gate line to contact two probes. Such an arrangement allows the battery cell to be subjected to uniform force when the first electrode and the second electrode rise to contact the battery cell. Secondly, each PAD point or the preset welding point of the gate line of the battery cell without the main grid is contacted and voltage is applied to each, so that the voltage on the battery cell is uniform and the laser induced sintering processing effect is good.

[0051] As another embodiment, the first electrode and the second electrode each include a plurality of probes, and the electrical input module 200 further includes a PCB board disposed below the first electrode and the second electrode, and all the probes are connected to the PCB board, and two wiring points are connected to the PCB board, which are respectively electrically connected to the positive electrode and the negative electrode of the power supply. The plurality of probes are connected in parallel through the PCB board and finally aggregated to the two wiring points, thereby reducing the number of wirings, and the wiring method is simple and concise.

[0052] As another example, Figure 4As shown, strip-shaped mounting holes 114 are provided on the carrier 110 at positions corresponding to the two ends of the carrier 112, and the carrier 112 is movably mounted in the strip-shaped mounting holes 114 so as to adjust the position of the carrier 112, and the movably mounted method is, for example, screws. Firstly, the present application makes the battery cell not easy to break by setting the suction nozzle 113 on the carrier 112, and secondly, the carrier 112 is set in a form that can adjust the position of the carrier 12 according to different battery cells, and has strong compatibility. When replacing the battery cell, it is not necessary to replace the carrier 110 to achieve compatibility with the absorption of other forms of battery cells.

[0053] As another example, Figure 2 As shown, the electric input module 200 also includes a longitudinal displacement mechanism 210 and a horizontal position adjustment mechanism 230 connected to the longitudinal displacement mechanism 210 through a first frame 220. The first electrode and the second electrode are connected to the horizontal position adjustment mechanism 230. The horizontal position adjustment mechanism 230 is used to drive the position of the first electrode and the second electrode in the horizontal plane. The position of the horizontal plane here can include any direction on the horizontal plane, such as the first direction, the second direction, or other directions. In addition, the first electrode and the second electrode can also be rotated to change the position. Among them, the driving actuator in the longitudinal displacement mechanism 210 can be a motor or a cylinder. The longitudinal displacement mechanism 210 can make the first electrode and the second electrode move to the electrode that contacts the back contact battery when needed, and no longer contact the electrode of the back contact battery when not needed. The horizontal position adjustment mechanism 230 can adjust the position of the first electrode and the second electrode in the horizontal plane so that they are accurately aligned with the grid line or Pad point on the back contact battery to improve the processing accuracy. The horizontal position adjustment mechanism 230 may include three drive mechanisms arranged in a right triangle, wherein the drive directions of the two drive mechanisms located on the hypotenuse are parallel to each other, and the drive direction of the remaining third drive mechanism is perpendicular to the drive directions of the two drive mechanisms located on the hypotenuse. When it is necessary to drive the first electrode and the second electrode to rotate horizontally, the three drive mechanisms can move simultaneously. Of course, the horizontal position adjustment mechanism 230 may also be other conventional structures in the prior art, such as an XYθ motion platform, which is also a conventional structure in the prior art.

[0054] As another example, Figure 1 , Figure 3As shown, a support device 500 is also provided at processing station B, and the support device 500 is located below the laser processing module 300 and above the carrier 110. The support device 500 includes a transparent support plate 510 and a lifting mechanism 520 connected to the transparent support plate. The lifting mechanism 520 drives the transparent support plate 510 to approach or move away from the carrier 110. The transparent support plate 510 has a transmittance of more than 95% for the laser beam emitted by the laser processing module 300. By providing the transparent support plate 510, it can provide support when the first electrode and the second electrode rise to contact the back contact battery, so as to achieve close contact between the first electrode and the second electrode and the battery cell, and at the same time, it is set to be transparent so that the laser beam can pass through to scan and process the battery cell.

[0055] As another embodiment, a plurality of exhaust holes are provided on the transparent support plate 510. The reason is that the battery cell is relatively thin, and the negative pressure is large after being attached to the glass, and it is not easy to separate. The exhaust holes are provided to avoid that the transparent support plate 510 and the battery cell are difficult to separate.

[0056] As another embodiment, the transparent support plate 510 is made of glass, which is easily available and has good laser transmission efficiency.

[0057] As another example, Figure 3 , Figure 5 As shown, the support device 500 also includes a bracket 501 connected to the lifting mechanism 520, a support plate fixing frame 502 connected to the bracket 501, and a clamping mechanism 530; the clamping mechanism 530 includes a support plate locking strip 531 and a locking member arranged on the inner side of the support plate fixing frame 502, and the support plate fixing frame 502 and the support plate locking strip 531 are separately provided with hole one and hole two, and hole one is connected with hole two, the support plate fixing frame 502 is used to carry the transparent support plate 510, and the locking member is installed in hole one and hole two, and the support plate locking strip 531 fixes and locks the transparent support plate 510 on the support plate fixing frame 502 through the locking member. Specifically, the support plate fixing frame 502 is a frame with a hollow middle, which is set as a hollow frame to avoid blocking the laser beam. In order to facilitate the carrying of the transparent support plate 510, a bearing bar is provided on the inner side of the bottom of the support plate fixing frame 502. It should be noted that the area of ​​the bearing bar is small (does not block the laser irradiation) and can carry the transparent support plate 510. The transparent support plate 510 is put down from the top, and after the transparent support plate 510 is laid flat on the bearing bar, the support plate locking bar 531 fixes and locks the transparent support plate 510 on the support plate fixing frame 502 through a locking member. Among them, the locking member can be, for example, a screw. The transparent support plate 510 is subjected to a compressive force, so that the transparent support plate 510 is not easy to break. At the same time, the process of tightening or loosening the transparent support plate 510 by the clamping mechanism 530 is very convenient, which is convenient for replacing the transparent support plate 510.

[0058] As another embodiment, considering that the lifting mechanism 520 may overshoot when losing the origin, the supporting device 500 further includes a buffer mechanism 540. Specifically, Figure 3 As shown, the support device 500 also includes a bracket 501 connected to the lifting mechanism 520, a support plate fixing frame 502 connected to the bracket 501, and a buffer mechanism 540; the buffer mechanism 540 includes a first support member 541 connected to the bracket 501, a second support member 542 slidably connected to the first support member 541, the second support member 542 is connected to the support plate fixing frame 502, and an elastic member 543 is arranged between the first support member 541 and the second support member 542 in the vertical direction. More specifically, the first support member 541 may include a back plate and a bending portion connected to the back plate, the bending portion is higher than the top of the second support member 542 so that the elastic member 543 is installed between the bending portion and the second support member 542, and the elastic member 543 is preferably a spring, one end of which can be installed in the second support member 542. By setting up the cache mechanism 540, when the transparent support plate 510 is subjected to a large impact force generated by the upward movement of the first electrode and the second electrode (at this time the lifting mechanism 520 has driven the transparent support plate 510 to drop into place and no longer works), the transparent support plate 510 will compress the elastic member 543 to avoid the impact and reduce the risk of the glass table top breaking.

[0059] As another embodiment, considering the error of processing and assembly, the flatness of the transparent support plate 510 is extremely high, which may also cause the transparent support plate 510 to be not parallel to the bearing surface of the bearing platform 110 when installed, so a leveling mechanism 550 is also included. Specifically, as Figure 3 As shown, the support device 500 also includes a bracket 501 connected to the lifting mechanism 520, a support plate fixing frame 502 connected to the bracket 501, and a leveling mechanism 550; the leveling mechanism 550 includes an adjustment frame 551 in a horizontal posture and leveling members 552 arranged near the four corners of the adjustment frame 551, the adjustment frame 551 is located above the support plate fixing frame 502, and the adjustment frame 551 is locked above the support plate fixing frame 502 through the leveling members 552. Among them, the leveling mechanism 550 is a conventional structure in the prior art. Specifically, the leveling member 552 can be a screw that passes through the adjustment frame 551 to level the support plate fixing frame 502. The specific working method is the prior art and will not be repeated. Through the leveling mechanism 550, even installation errors caused by processing and assembly can be corrected.

[0060] As another embodiment, the transparent support plate 510 is composed of a plurality of parallel arranged strip-shaped transparent members, and the positions of the strip-shaped transparent members coincide with the projections of the first electrode and the second electrode on the horizontal plane, that is, the positions and number of the strip-shaped transparent members correspond to the number and positions of the first electrode and the second electrode, thereby when the first electrode and the second electrode pass through the hollow portion to contact the back surface of the battery, the strip-shaped transparent members can provide support for the first electrode and the second electrode when they rise to contact the back surface of the battery.

[0061] As another example, Figure 4 As shown, the carrier device 100 is a turntable module, which includes a rotary drive mechanism 120 and a plurality of carriers 110 connected to the peripheral side of the rotary drive mechanism 120, and the rotary drive mechanism 120 is used to drive the carriers 110 to rotate through the processing station B. Specifically, the turntable module may also include a support seat, and the plurality of carriers 110 are connected to the rotary drive mechanism 120 through the support seat, and the rotary drive mechanism 120 is, for example, a DD motor. The carrier device 100 in the form of a turntable module can realize rapid transportation and mass production of battery cells.

[0062] As another example, Figure 4 As shown, the number of the carriers 110 is four, and the laser induced sintering processing device has a loading and positioning station A, a preparation function station D, a processing station B, and a unloading station C ( Figure 4 The four stations shown are arranged counterclockwise, and can of course be arranged clockwise), that is, the positioning station and the loading station are the same station. Since there are four carriers, there are four corresponding stations. The rotary drive mechanism 120 drives the carrier 110 to rotate 90° at a time. Therefore, correspondingly, the extension directions of the carriers 110 on adjacent carriers 110 are perpendicular to each other. A visual positioning mechanism 410 is arranged below the bearing surface of the carrier 110 corresponding to the loading positioning station A. The rotary drive mechanism 120 drives the carrier 110 to pass through the loading positioning station A, the spare function station D, the processing station B, and the unloading station C in sequence. The spare function station D can be used for other functions, such as as a processing station, two processing stations work at the same time, or as a sheet dropping station to transfer unnecessary battery sheets.

[0063] Furthermore, a loading conveying module and a loading handling mechanism can be set corresponding to the loading positioning station A, and a unloading conveying module and a unloading handling mechanism can be set corresponding to the unloading station C, wherein the loading conveying module and the unloading conveying module can both be belt conveyors, and the loading handling mechanism and the unloading handling mechanism can both be mechanical motion arms, which are used to transport the battery cells from the loading conveying module to the loading platform 110 corresponding to the loading station A or to transport the battery cells from the loading platform 110 corresponding to the unloading station C to the unloading conveying module. This part of the structure can adopt the structure of the existing technology and will not be repeated here.

[0064] Working process:

[0065] When the battery cell is transferred to the carrier 110 corresponding to the loading and positioning station A, the battery cell is sucked by the suction nozzle 113 on the carrier 110, and the visual positioning mechanism 410 under the carrier 110 completes the visual photography of the battery cell, and then sends the acquired position data information to the horizontal position adjustment mechanism 230. When the battery cell is rotated from the loading and positioning station A to the processing station B, the adjustment mechanism 230 corrects the position of the first electrode and the second electrode according to the position data information. The transparent support plate 510 moves downward under the drive of the lifting mechanism 520, and the first electrode and the second electrode move upward under the drive of the longitudinal displacement mechanism. The transparent support plate 510 first reaches the predetermined working position, and the first electrode and the second electrode pass through the hollow part 120 of the carrier 110 to move the battery cell upward until the battery cell supports the transparent support plate 510. At this time, the laser processing module 300 works while applying the reverse voltage to complete the laser induced sintering of the battery cell. It should be noted that the simultaneous here means that during the laser induced sintering process of the battery cell, it is ensured that the voltage is applied and the laser beam is scanned at the same time.

[0066] In this specification, each embodiment is described in a progressive, parallel, or progressive and parallel manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0067] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A laser induced sintering processing device for a back contact battery, comprising a carrying device, the carrying device comprising a carrying platform for carrying the back contact battery, the laser induced sintering processing device having a processing station, an electric input module and a laser processing module corresponding to the processing station, the electric input module comprising a first electrode and a second electrode, the first electrode and the second electrode are respectively used to electrically connect to the positive electrode and the negative electrode of the power supply, and the first electrode and the second electrode are also respectively used to electrically connect to the positive electrode and the negative electrode of the back contact battery, the laser processing module emits a laser beam to scan the battery cell when a reverse voltage is applied to the back contact battery, characterized in that: The laser processing module is located above the carrier platform, the first electrode and the second electrode are located below the carrier surface of the carrier platform, and the carrier platform includes a hollow portion for the first electrode and the second electrode to pass through; The laser induced sintering processing device also includes a positioning station arranged upstream of the processing station, and a visual positioning mechanism is arranged at the positioning station. The visual positioning mechanism is located below the supporting surface of the supporting platform to obtain the position information of the grid line or PAD point or MARK point on the back side of the back contact battery.

2. The laser induced sintering processing device for back contact battery according to claim 1, characterized in that: The support platform also includes a support member, on which a plurality of suction nozzles made of flexible material are arranged, or at least the surface of the support member is made of flexible material, and an adsorption channel is opened on the support member to adsorb the battery sheet.

3. The laser induced sintering processing device for back contact battery according to claim 1, characterized in that: The laser processing module obtains the position data of the grid lines, PAD points or MARK points on the back side of the back contact battery according to the visual positioning mechanism, and controls the laser beam to scan along the grid lines of the battery cell or perpendicular to the grid lines of the battery cell.

4. The laser induced sintering processing device for back contact battery according to claim 1, characterized in that: A glass protective cover is arranged on the surface of the visual positioning mechanism and / or an air blowing component is arranged on the side of the visual positioning mechanism.

5. The laser induced sintering processing device for back contact battery according to claim 2, characterized in that: The first electrode and the second electrode each include a plurality of rows of strip electrodes arranged along a first direction, each row of the strip electrodes being arranged along a second direction, and the second direction being perpendicular to the first direction; There are multiple carriers, each of which is strip-shaped. The strip-shaped carriers are extended along the second direction, and multiple carriers are arranged in sequence along the first direction. Multiple carriers are arranged between the hollow parts so that the hollow parts are divided into multiple hollow units, and the strip-shaped electrodes pass through the hollow units.

6. The laser induced sintering processing device for back contact battery according to claim 5, characterized in that: The strip electrodes are probe rows, which include a plurality of co-linearly arranged probes, and the sum of the number of probes in the first electrode and the number of probes in the second electrode corresponds to the number of all preset gate line contact points on the back side of the back contact cell.

7. The laser induced sintering processing device for back contact battery according to claim 6, characterized in that: The first electrode and the second electrode each include a plurality of probes, and the electrical input module also includes a PCB board arranged below the first electrode and the second electrode, all of the probes are connected to the PCB board, and the PCB board is connected to two wiring points, which are electrically connected to the positive and negative poles of the power supply respectively.

8. The laser induced sintering processing device for back contact battery according to claim 5, characterized in that: The bearing platform is provided with strip-shaped mounting holes at positions corresponding to the two ends of the bearing member, and the bearing member is movably mounted in the strip-shaped mounting holes so as to adjust the position of the bearing member.

9. The laser induced sintering processing device for back contact battery according to claim 5, characterized in that: The electrical input module also includes a longitudinal displacement mechanism and a horizontal position adjustment mechanism connected to the longitudinal displacement mechanism through a first frame, the first electrode and the second electrode are connected to the horizontal position adjustment mechanism, and the horizontal position adjustment mechanism is used to adjust the positions of the first electrode and the second electrode in the horizontal plane at the same time.

10. The laser induced sintering processing device for back contact cells according to claim 1, characterized in that: A supporting device is also provided at the processing station, and the supporting device is located below the laser processing module and above the supporting platform. The supporting device includes a transparent supporting plate and a lifting mechanism connected to the transparent supporting plate. The lifting mechanism drives the transparent supporting plate to approach or move away from the supporting platform. The transmittance of the transparent supporting plate to the laser beam emitted by the laser processing module is above 95%.

11. The laser induced sintering processing device for back contact cells according to claim 10, characterized in that: The transparent support plate is provided with a plurality of exhaust holes.

12. The laser induced sintering processing device for back contact cells according to claim 10, characterized in that: The transparent supporting plate is glass.

13. The laser induced sintering processing device for back contact battery according to claim 10, characterized in that: The support device also includes a bracket connected to the lifting mechanism, a support plate fixing frame connected to the bracket, and a clamping mechanism; The clamping mechanism includes a support plate locking strip and a locking piece arranged on the inner side of the support plate fixing frame. The support plate fixing frame and the support plate locking strip are respectively provided with a hole one and a hole two, and the hole one is connected with the hole two. The support plate fixing frame is used to support the transparent support plate. The locking piece is installed in the hole one and the hole two. The support plate locking strip fixes and locks the transparent support plate to the support plate fixing frame through the locking piece.

14. The laser induced sintering processing device for back contact battery according to claim 10, characterized in that: The support device also includes a bracket connected to the lifting mechanism, a support plate fixing frame connected to the bracket, and a buffer mechanism; The buffer mechanism includes a first support member relatively connected to the bracket, a second support member slidably connected to the first support member, the second support member is connected to the support plate fixing frame, and an elastic member is arranged between the first support member and the second support member in the vertical direction.

15. The laser induced sintering processing device for back contact battery according to claim 10, characterized in that: The support device also includes a bracket connected to the lifting mechanism, a support plate fixing frame connected to the bracket, and a leveling mechanism; The leveling mechanism comprises an adjustment frame in a horizontal posture and leveling members arranged at four corners of the adjustment frame, and the adjustment frame is locked above the support plate fixing frame through the leveling members.

16. The laser induced sintering processing device for back contact cells according to claim 10, characterized in that: The transparent support plate is composed of a plurality of parallel strip-shaped transparent members, and the positions of the strip-shaped transparent members coincide with the projections of the first electrode and the second electrode on a horizontal plane.

17. The laser induced sintering processing device for back contact cells according to any one of claims 1 to 16, characterized in that: The carrying device is a turntable module, which includes a rotation drive mechanism and a plurality of the carrying platforms connected to the periphery of the rotation drive mechanism. The rotation drive mechanism is used to drive the carrying platforms to rotate through the processing stations.

18. The laser induced sintering processing device for back contact cells according to claim 17, characterized in that: There are four carrier platforms, each of which further includes a carrier. The extension directions of the carriers on adjacent carrier platforms are perpendicular to each other. The laser induced sintering processing device has a loading and positioning station, a preparatory functional station, a processing station, and a unloading station arranged in sequence. A visual positioning mechanism is arranged below the carrying surface of the carrier platform corresponding to the loading and positioning station. The rotary drive mechanism drives the carrier platform to pass through the loading and positioning station, the preparatory functional station, the processing station, and the unloading station in sequence.

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