Laser-induced sintering equipment of back contact battery

Abstract

The laser-induced sintering equipment comprises a bearing device used for bearing the back contact battery, the bearing device is provided with a machining station, a laser machining module and an electric input module are arranged corresponding to the machining station, and the electric input module comprises a power source, a first electrode and a second electrode. The first electrode and the second electrode are connected with the positive electrode and the negative electrode of a power source respectively and used for making electric contact with the positive electrode and the negative electrode of a battery respectively, and the laser processing module is used for emitting laser beams to scan the battery while reverse voltage is applied to the battery. Wherein the first electrode comprises a plurality of first contact units, the second electrode comprises a plurality of second contact units, the first contact units and the second contact units are arranged in the first direction to form at least one linear contact electrode, and the first contact units and the second contact units in the linear contact electrode are arranged in a staggered mode. By means of the laser-induced sintering equipment, laser-induced sintering processing of the back contact type battery can be achieved, and the photoelectric conversion efficiency is 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 surface electrode and the back electrode of a crystalline silicon solar cell 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. It is difficult to form a good ohmic contact when sintering the slurry on the battery cell in a traditional airflow thermal cycle sintering furnace. In order to reduce the contact resistance, the applicant uses laser induced sintering technology to excite the battery carriers through laser, and flow in a directional manner under the action of the reverse voltage of the external electric field to form a loop. When the loop current flows through the metal-silicon wafer interface, the contact resistance between the metal and the silicon wafer is relatively large, which produces a more obvious thermal effect. The heat can further promote the mutual diffusion of the metal and the silicon wafer, thereby obtaining excellent contact characteristics after sintering.

[0003] However, there is currently no laser induced sintering processing equipment specifically for back-contact batteries. In addition, since the positive and negative electrodes of the back-contact battery are all located on one side (the back) of the battery cell, the number of positive and negative electrodes is large and the intervals are small, which puts higher requirements on the positional accuracy of the electrodes in contact with the positive and negative electrodes of the back-contact battery. Utility Model Content

[0004] In view of this, the present application provides a laser induced sintering device for a back-contact battery, comprising a carrying device for carrying a battery cell, the carrying device having a processing station, a laser processing module and an electric input module being arranged corresponding to the processing station, the electric input module comprising a power supply, a first electrode and a second electrode located above the carrying device, the first electrode and the second electrode being connected to the positive electrode and the negative electrode of the power supply, respectively; the first electrode and the second electrode are respectively used to electrically contact the positive electrode and the negative electrode of the back-contact battery, the laser processing module is used to emit a laser beam to scan the battery cell while a reverse voltage is applied to the back-contact battery; wherein the first electrode comprises a plurality of first contact units, the second electrode comprises a plurality of second contact units, the plurality of the first contact units and the plurality of the second contact units are arranged along a first direction to form at least one linear contact electrode, and the first contact units and the second contact units in the linear contact electrode are alternately arranged.

[0005] Furthermore, the electrical input module also includes at least one strip bracket, which is extended along the first direction and is made of insulating material. A plurality of the first contact units and a plurality of the second contact units are fixed on the strip bracket and at least the lower ends extend out of the strip bracket for electrical contact with the positive electrode and the negative electrode of the back contact battery.

[0006] Furthermore, a plurality of the first contact units and a plurality of the second contact units are arranged along a first direction to form a plurality of the linear contact electrodes, and a plurality of the linear contact electrodes are arranged at intervals along a second direction, and the second direction is perpendicular to the first direction; the electrical input module includes a plurality of the strip brackets corresponding to the number of the linear contact electrodes.

[0007] Furthermore, a plurality of the first contact units and a plurality of the second contact units are arranged along the first direction to form at least two linear contact electrodes, and at least two linear contact electrodes are symmetrically or asymmetrically arranged on both sides of a midline of a back contact battery surface.

[0008] Furthermore, at least two of the linear contact electrodes arranged on both sides of the midline of the back contact battery surface are respectively called the first linear contact electrode and the second linear contact electrode, wherein the first contact unit in the first linear contact electrode corresponds to the Pad point at the odd column position, and the second contact unit corresponds to the Pad point at the even column position, and the second contact unit of the second linear contact electrode corresponds to the Pad point at the odd column position, and the first contact unit corresponds to the Pad point at the even column position.

[0009] Furthermore, the electrical input module also includes a strip-shaped first conductive sheet connected to multiple first contact units, and a strip-shaped second conductive sheet connected to multiple second contact units, the first conductive sheet and the second conductive sheet do not contact each other, the first conductive sheet and the second conductive sheet are both arranged along the first direction, and are electrically connected to the positive and negative poles of the power supply respectively.

[0010] Furthermore, the first contact unit and the second contact unit pass through the strip bracket longitudinally, and the upper and lower ends extend out of the strip bracket respectively; wherein the electrical input module also includes a strip-shaped intermediate insulating sheet arranged along the first direction, the first conductive sheet, the intermediate insulating sheet, and the second conductive sheet are arranged side by side above the strip bracket, the intermediate insulating sheet is used to separate the first conductive sheet and the second conductive sheet, the first conductive sheet is connected to one end of a plurality of the first contact units extending above the strip bracket, and the second conductive sheet is connected to one end of a plurality of the second contact units extending above the strip bracket.

[0011] Furthermore, the first contact unit and the second contact unit pass through the strip bracket longitudinally, and an upper and lower layer of hollow patterns are arranged at the middle position of the strip bracket, and each layer of the hollow pattern includes a plurality of hollow openings arranged at intervals along the first direction, and the hollow openings are used to expose part of the first contact unit and part of the second contact unit; wherein the upper layer of the hollow openings and the lower layer of the hollow openings are alternately arranged and correspond to the first contact unit and the second contact unit respectively, the first conductive sheet is connected to the parts of the plurality of the first contact units exposed outside the hollow openings, and the second conductive sheet is connected to the parts of the plurality of the second contact units exposed outside the hollow openings.

[0012] Furthermore, the electrical input module also includes a longitudinal displacement mechanism, a horizontal position adjustment mechanism connected to the longitudinal displacement mechanism through a first frame, and the strip bracket is connected to the horizontal position adjustment mechanism through a second frame. The horizontal position adjustment mechanism is used to drive the first electrode and the second electrode to move unidirectionally in the horizontal plane or rotationally in the horizontal plane at the same time.

[0013] Furthermore, the horizontal position adjustment mechanism includes three driving mechanisms arranged in a right triangle, wherein driving directions of the two driving mechanisms located on the hypotenuse are parallel to each other, and the driving direction of the third driving mechanism is perpendicular to the driving directions of the two driving mechanisms located on the hypotenuse.

[0014] Furthermore, a visual positioning mechanism is provided above the carrying device and before the processing station for obtaining the position of the back contact battery on the carrying device so that the horizontal position adjustment mechanism can adjust the positions of the first electrode and the second electrode according to the position of the back contact battery.

[0015] Further, the interval between the first contact unit and the second contact unit in the linear contact electrode is n times the distance between adjacent Pad points on the back contact cell, where n≥1.

[0016] Furthermore, the number of the processing stations is two, namely a first processing station and a second processing station, and the first processing station and the second processing station are respectively provided with the laser processing module and the electric input module;

[0017] The first electrode and the second electrode corresponding to the first processing station contact the first area of ​​the back contact battery surface, and the first electrode and the second electrode corresponding to the second processing station contact the second area of ​​the back contact battery surface. The first area and the second area are arranged along a second direction, the second direction is perpendicular to the first direction, and the first area and the second area are different.

[0018] Furthermore, the turntable module includes a rotary drive mechanism, a horizontally arranged and centrally symmetrical support frame, and a plurality of supporting platforms installed on the support frame; the driving shaft of the rotary drive mechanism is vertically arranged and connected to the center of the support frame, the distance between each supporting platform and the center of the support frame is equal, and the rotary drive mechanism is used to drive the supporting platform through the processing station.

[0019] Further, the turntable module includes four carriers, the number of the processing stations is two, namely the first processing station and the second processing station, and the first processing station and the second processing station are respectively provided with the laser processing module and the electric input module;

[0020] The first electrode and the second electrode corresponding to the first processing station contact the first area of ​​the battery cell, and the first electrode and the second electrode corresponding to the second processing station contact the second area of ​​the battery cell, the first area and the second area are arranged along a second direction, the second direction is perpendicular to the first direction, and the first area and the second area are different;

[0021] The carrying device has four workstations, namely the loading and positioning station, the first processing station, the second processing station, and the unloading station. A visual positioning mechanism is arranged above the carrying platform corresponding to the loading and positioning station. The rotary drive mechanism is used to drive the carrying platform to pass through the loading and positioning station, the first processing station, the second processing station, and the unloading station in sequence.

[0022] Furthermore, a loading transmission device and a loading handling device are provided corresponding to the loading positioning station, a unloading transmission device and a unloading handling device are provided corresponding to the unloading station, a positioning station is provided between the loading transmission device and the carrying device, and a position adjustment mechanism is provided at the positioning station.

[0023] Further, the loading and conveying device is a conveyor belt, and the loading and handling device is an L-shaped rotating mechanical arm, which includes a first rotating driving actuator and two mechanical arms connected to the first rotating driving actuator and perpendicular to each other, and the ends of the two mechanical arms are respectively connected to suction cups for adsorbing the battery sheet downward, and the L-shaped rotating mechanical arm can rotate 90° at a time;

[0024] Among them, the loading and conveying device, the loading and positioning station, the unloading station, and the unloading and conveying device are arranged in a colinear manner; the position adjustment mechanism is arranged on the mid-perpendicular line between the output end of the loading and conveying device and the loading and positioning station, that is, the position adjustment mechanism is arranged at a position directly below the suction cup when the L-shaped rotating robotic arm rotates 90° and stops; the first rotary drive actuator with the suction cups on the two robotic arms are respectively and simultaneously located above the loading and conveying device and the position adjustment mechanism, or are respectively and simultaneously located above the position adjustment mechanism and the supporting platform corresponding to the loading and positioning station.

[0025] Furthermore, the unloading transmission device is a conveyor belt, and the unloading handling device is a straight-line rotating robotic arm, which includes a second rotating drive actuator and a straight-line robotic arm connected to the second rotating drive actuator, and the end of the robotic arm is connected to a suction cup for downwardly adsorbing the battery cell; the second rotating drive actuator carries the suction cup on the straight-line robotic arm to move back and forth above the unloading transmission device and the supporting platform corresponding to the unloading station.

[0026] Compared with the prior art, the laser induced sintering equipment for back-contact cells proposed in the present application can realize laser induced sintering processing for back-contact cells to improve the photoelectric conversion efficiency of the back-contact cells. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] 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.

[0028] 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.

[0029] Figure 1 A laser induced sintering device for a back contact battery according to an embodiment of the present application;

[0030] Figure 2 A schematic diagram of the structure of a linear contact electrode according to an embodiment of the present application;

[0031] Figure 3A schematic structural diagram of a linear contact electrode in another embodiment provided by the present application;

[0032] Figure 4 A schematic diagram of the structure of a portion of an electric input module according to an embodiment of the present application;

[0033] Figure 5 A schematic diagram of the structure of a carrying device according to an embodiment of the present application;

[0034] Figure 6 A laser induced sintering device for a back contact battery according to another embodiment of the present application;

[0035] Figure 7 A schematic diagram of the laser scanning area when the first electrode and the second electrode contact the back contact battery at two processing stations provided in the present application;

[0036] Figure 8 A schematic diagram of the laser scanning area when the first electrode and the second electrode contact the back contact battery at the two processing stations provided in 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 As shown, the present application proposes a laser induced sintering device for a back-contact battery, including a carrier 100 for carrying the back-contact battery, the carrier 100 having a processing station, and a laser processing module 300 and an electric input module 200 are arranged corresponding to the processing station, the electric input module 200 includes a power supply 210, a first electrode and a second electrode located above the carrier 100, the first electrode and the second electrode are respectively connected to the positive electrode and the negative electrode of the power supply 210; the first electrode and the second electrode are respectively used to electrically contact the positive electrode and the negative electrode of the back-contact battery, and the laser processing module 300 is used to emit a laser beam to scan the battery sheet when a reverse voltage is applied to the back-contact battery; wherein the first electrode includes a plurality of first contact units 220, the second electrode includes a plurality of second contact units 230, and the plurality of first contact units 220 and the plurality of second contact units 230 are arranged along a first direction (for example Figure 1The first contact units 220 and the second contact units 230 in the linear contact electrode are arranged alternately. Of course, the plurality of first contact units 220 and the plurality of second contact units 230 can also be arranged into a plurality of linear contact electrodes arranged side by side and separately, for example Figure 4 It should be noted that for simplicity, Figure 1 Only one number of the first contact unit 220 and one number of the second contact unit 230 are numbered, but in fact there are multiple numbers.

[0040] The laser induced sintering equipment for back-contact cells proposed in the present application can realize laser induced sintering processing of back-contact cells to improve the photoelectric conversion efficiency of the back-contact cells.

[0041] It should be noted that, in order to facilitate the electrical contact between the first contact unit 220 and the second contact unit 230 and the positive electrode and the negative electrode on the back of the back contact battery, the back contact battery placed on the carrier 100 has the back side of the electrode facing upward, facing the first electrode and the second electrode of the electrical input module 200. In addition, the electrode positions of the back contact battery that the first contact unit 220 and the second contact unit 230 contact are generally the Pad points on the electrodes. In addition, the staggered arrangement of the first contact unit 220 and the second contact unit 230 in the linear contact electrode means that each Pad point on the battery can be in electrical contact with the first contact unit 220 or the second contact unit 230, or two or more Pad points are spaced between adjacent first contact units 220 and second contact units 230.

[0042] The first contact unit 220 and the second contact unit 230 can both be elastic probes. The elastic probe can be a hollow probe in the prior art with a spring, or the probe itself can be designed as a solid elastic structure. The laser processing module 300 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. Furthermore, the laser processing module 300 is located above the first electrode and the second electrode.

[0043] As another example, Figure 2As shown, the electric input module 200 also includes at least one strip bracket 240, which is extended along the first direction and is made of insulating material. A plurality of first contact units 220 and a plurality of second contact units 230 are connected to the strip bracket 240, and at least the lower ends extend out of the strip bracket 240, for making electrical contact with the positive electrode and the negative electrode of the back contact battery. The strip bracket 240 can be used to connect the plurality of first contact units 220 and the plurality of second contact units 230 together and arrange them in a co-linear manner to form a linear contact electrode, so as to contact the pad points arranged in a linear manner on an electrode of the back contact battery, and the strip bracket 240 is made of insulating material to prevent short circuit.

[0044] As another embodiment, a plurality of first contact units 220 and a plurality of second contact units 230 are arranged along a first direction to form a plurality of linear contact electrodes, and the plurality of linear contact electrodes are arranged at intervals along a second direction, and the second direction is perpendicular to the first direction; the electrical input module 200 includes a plurality of strip brackets 240 corresponding to the number of the linear contact electrodes, that is, one linear contact electrode is connected to one strip bracket 240. For example Figure 4 As shown, at this time, two linear contact electrodes are arranged, the first direction is the X-axis direction in the figure, and the second direction is the Y-axis direction in the figure. Of course, the number of linear contact electrodes can also be three, four or more.

[0045] As another embodiment, a plurality of first contact units 220 and a plurality of second contact units 230 are arranged along the first direction to form at least two linear contact electrodes, and at least two linear contact electrodes are symmetrically or asymmetrically arranged on both sides of the center line of the back contact battery surface. Considering that in the current application of back contact batteries, in order to improve the photoelectric conversion efficiency, two half-sheets are obtained by slicing at the center line position of the back contact battery, and then the multiple half-sheets are welded into the form of a battery assembly. Among them, the battery placed on the carrier 100 can be either a standard whole sheet that has not been sliced, or two half-sheets that have been sliced. When they are two half-sheets that have been sliced, the two half-sheets can be close together without a gap, or they can be separated by a certain gap. By symmetrically or asymmetrically arranging at least two linear contact electrodes on both sides of the center line of the back contact battery surface, the corresponding parts of the two half-sheets of the back contact battery can be scanned by the laser beam at the same time, thereby improving the processing efficiency. Among them, when the back contact battery is placed in the middle position on the carrier 100, the two sides of the center line of the back contact battery surface can also be considered as the two sides of the center line of the carrier 100.

[0046] Wherein, when at least two linear contact electrodes are symmetrically arranged on both sides of the midline of the back contact battery surface, the positions where the two linear contact electrodes contact the battery surface refer to Figure 7The position indicated by the middle arrow; when at least two linear contact electrodes are asymmetrically arranged on both sides of the midline of the back contact battery surface, the positions where the two linear contact electrodes contact the battery surface can be referred to Figure 8 The arrow in the middle indicates the location. Of course, Figure 7 and Figure 8 These are just two examples, and the present invention is not limited to these.

[0047] It should be noted that when the back-contact battery cell placed on the supporting device 100 is two half-cells, when the two half-cells are placed on the supporting device 100, the two are basically aligned side by side, and at this time, the Pad points on the positive electrodes and the Pad points on the negative electrodes on the two half-cells are staggered, that is, for example, the Pad points at the odd-numbered column positions of one half-cell all correspond to the positive electrodes, and the Pad points at the even-numbered column positions all correspond to the negative electrodes, and the Pad points at the odd-numbered column positions of the other half-cell all correspond to the negative electrodes, and the Pad points at the even-numbered column positions all correspond to the positive electrodes. Therefore, when at least two linear contact electrodes correspond to two half-sheets respectively, the first contact unit 220 and the second contact unit 230 of the two linear contact electrodes corresponding to the two half-sheets are staggered. Assuming that the at least two linear contact electrodes arranged on both sides of the midline of the back contact battery surface are respectively called the first linear contact electrode and the second linear contact electrode, when the first contact unit 220 of the first linear contact electrode corresponds to the Pad point of the odd column position and the second contact unit 230 corresponds to the Pad point of the even column position, the second contact unit 230 of the second linear contact electrode corresponds to the Pad point of the odd column position and the first contact unit 220 corresponds to the Pad point of the even column position. Assuming that one half-chip corresponds to two or more linear contact electrodes, at least two corresponding linear contact electrodes on the same half-chip are the same, that is, the first contact unit 220 and the second contact unit 230 corresponding to different linear contact electrodes of the same half-chip do not need to be staggered, but the first contact unit 220 and the second contact unit 230 in the linear contact electrode corresponding to the second half-chip are all staggered with the first contact unit 220 and the second contact unit 230 in the linear contact electrode corresponding to the first half-chip.

[0048] As another embodiment, the electric input module 200 further includes a first conductive sheet 250 in the shape of a strip connected to the plurality of first contact units 220, and a second conductive sheet 270 in the shape of a strip connected to the plurality of second contact units 230. The first conductive sheet 250 and the second conductive sheet 270 do not contact each other. The first conductive sheet 250 and the second conductive sheet 270 are both arranged along the first direction and are electrically connected to the positive electrode and the negative electrode of the power source 210, respectively. Through the first conductive sheet 250 and the second conductive sheet 270 in the shape of a strip, the staggered first contact units 220 and the second contact units 230 can be electrically connected to the positive electrode and the negative electrode of the power source 210, respectively, in a simple manner, and the wiring circuit is simple and beautiful. Among them, there are many ways to connect the plurality of first contact units 220 and the plurality of second contact units 230 through the first conductive sheet 250 and the second conductive sheet 270, such as the examples described below, but of course not limited thereto.

[0049] As another example, Figure 2 As shown in the figure (not all the first contact units 220 and the second contact units 230 are labeled), the first contact units 220 and the second contact units 230 pass through the strip bracket 240 in the longitudinal direction, and the upper and lower ends extend out of the strip bracket 240 respectively; wherein, the electric input module 200 further includes a strip-shaped intermediate insulating sheet 260 arranged along the first direction, the first conductive sheet 250, the intermediate insulating sheet 260, and the second conductive sheet 270 are arranged side by side above the strip bracket 240, the intermediate insulating sheet 260 is used to separate the first conductive sheet 250 and the second conductive sheet 270, the first conductive sheet 250 is connected to one end of the plurality of first contact units 220 extending above the strip bracket 240, and the second conductive sheet 270 is connected to one end of the plurality of second contact units 230 extending above the strip bracket 240. Through this arrangement, the first conductive sheet 250 and the second conductive sheet 270 can be conveniently electrically connected to the plurality of first contact units 220 and the plurality of second contact units 230 respectively.

[0050] As another example, Figure 3As shown in the figure (the first conductive sheet 250 and the second conductive sheet 270 are not drawn, and all the first contact units 220 and the second contact units 230 are not labeled), the first contact unit 220 and the second contact unit 230 pass through the strip bracket 240 in the longitudinal direction, and the middle position of the strip bracket 240 is provided with an upper and lower layer of hollow patterns, each layer of hollow patterns includes a plurality of hollow openings (not labeled) arranged at intervals along the first direction, and the hollow openings are used to expose a portion of the first contact unit 220 and a portion of the second contact unit 230; wherein the upper layer of hollow openings and the lower layer of hollow openings are arranged alternately and correspond to the first contact unit 220 and the second contact unit 230 respectively, the first conductive sheet 250 is connected to the portion of the first contact unit 220 exposed outside the hollow opening, and the second conductive sheet 270 is connected to the portions of the plurality of second contact units 230 exposed outside the hollow opening. Through this arrangement, the first conductive sheet 250 and the second conductive sheet 270 can also be electrically connected to the plurality of first contact units 220 and the plurality of second contact units 230 respectively.

[0051] As another example, Figure 4 As shown, the electric input module 200 also includes a longitudinal displacement mechanism 280, a horizontal position adjustment mechanism 290 connected to the longitudinal displacement mechanism 280 through a first frame 291, and the strip bracket 240 is connected to the horizontal position adjustment mechanism 290 through a second frame 292. The horizontal position adjustment mechanism 290 is used to drive the first electrode and the second electrode to move unidirectionally in the horizontal plane at the same time (for example, along the X-axis direction or the Y-axis direction) or rotate in the horizontal plane. The longitudinal displacement mechanism 280 can make the first electrode and the second electrode move downward to contact the electrode of the back contact battery when needed (for example, applying a reverse voltage to the back contact battery sheet), and no longer contact the electrode of the back contact battery when not needed (for example, the back contact battery is to be moved to a processing station or removed from the processing station). The horizontal position adjustment mechanism 290 can adjust the position of the first electrode and the second electrode in the horizontal plane so that they are accurately aligned with the Pad point on the battery, thereby improving the processing accuracy. Among them, the horizontal position adjustment mechanism 290 can be Figure 4 The structure shown may also be other conventional structures in the prior art.

[0052] As another example, Figure 4As shown, the horizontal position adjustment mechanism 290 includes three driving mechanisms 293 arranged in a right triangle, wherein the driving directions of the two driving mechanisms 290 located on the hypotenuse are parallel to each other, for example, driving the first electrode and the second electrode to move along the X-axis direction, and the driving direction of the remaining third driving mechanism 293 is perpendicular to the driving directions of the two driving mechanisms located on the hypotenuse, for example, driving the first electrode and the second electrode to move along the Y-axis direction. When it is necessary to drive the first electrode and the second electrode to rotate horizontally, the three driving mechanisms 290 can move simultaneously. In addition, in order to facilitate control, the horizontal position adjustment mechanism 290 is actually provided with a set of mechanical slide rails at the diagonal of the third driving mechanism 293, but there is no driver to provide driving force. Considering that the horizontal position adjustment mechanism 290 is a conventional structure in the prior art, it will not be described in detail here.

[0053] As another embodiment, a visual positioning mechanism 400, such as a commonly used CCD camera, is provided above the carrier 100 and before the processing station to obtain the position of the back contact battery on the carrier 100 so that the horizontal position adjustment mechanism 290 can adjust the positions of the first electrode and the second electrode according to the position of the back contact battery to improve the processing accuracy. Figure 6 As shown, the visual positioning mechanism 400 is arranged at the loading positioning station A.

[0054] As another embodiment, the interval between the first contact unit 220 and the second contact unit 230 is n times the distance between adjacent Pad points on the back contact battery sheet, where n≥1. That is, each Pad point on the battery can be in electrical contact with the first contact unit 220 and the second contact unit 230 (in this case, all the Pad points at odd positions and even positions are in electrical contact with the first contact unit 220 and the second contact unit 230), or two or more Pad points can be spaced between adjacent first contact units 220 and second contact units 230.

[0055] As another embodiment, there are two processing stations, namely the first processing station B and the second processing station C. The first processing station B and the second processing station C are respectively provided with a laser processing module 300 and an electric input module 200; the first electrode and the second electrode corresponding to the first processing station B contact the first area of ​​the back contact battery surface, and the first electrode and the second electrode corresponding to the second processing station C contact the second area of ​​the back contact battery surface. The first area and the second area are arranged along the second direction, the second direction is perpendicular to the first direction, and the first area and the second area are different. During operation, the first electrode and the second electrode of the first processing station B contact the first area of ​​the back contact battery surface, and the laser processing module 300 corresponding to the first processing station B laser scans the area outside the first area of ​​the battery cell surface. The back contact battery is transferred to the second processing station C, and the first electrode and the second electrode of the second processing station C contact the second area of ​​the back contact battery surface. The laser processing module 300 corresponding to the second processing station C laser scans the area outside the second area of ​​the battery cell surface. At this time, the area that was not scanned and blocked by the first processing station B is just scanned. By setting two processing stations, and both processing stations are provided with laser processing modules 300 and electric input modules 200, the two processing stations process the same back contact battery, which can prevent the first electrode and the second electrode from blocking the laser and improve the photoelectric conversion efficiency. In addition, the two processing stations can process at the same time, that is, when the first processing station processes a part of the area of ​​a new back contact battery, the other processing station can process the area of ​​the previous battery that has not been processed by the first processing station, which can further improve the production capacity.

[0056] Specifically, for example Figure 7 As shown, Figure 7 (a) is a schematic diagram of the laser scanning area when the first electrode and the second electrode at the first processing station B contact the back contact battery, wherein the middle filling pattern area is the second area on the battery surface, and the area outside the middle filling pattern area is the first area on the battery surface. At this time, multiple first contact units 220 and multiple second contact units 230 are arranged in the first direction to form two linear contact electrodes, and the straight lines indicated by the two arrows are the positions in the first area of ​​the battery surface where the two linear contact electrodes respectively contact the back contact (it should be noted that the straight line does not mean that all points on the straight line are in contact, and the first contact unit 220 and the second contact unit 230 contact the Pad points that are spaced apart on the straight line). At this time, the scanning area of ​​the laser processing module 300 is the middle filling pattern area of ​​the battery; further, in order to achieve a better processing effect, there can be more than two linear contact electrodes, and other positions in the first area (the straight line where the Pad is located) can be contacted. Figure 7(b) is a schematic diagram of the laser scanning area when the first electrode and the second electrode of the second processing station C contact the back contact battery, wherein the positions indicated by the two arrows are the positions where the two linear contact electrodes contact the second area of ​​the back contact battery surface respectively. At this time, the laser processing module 300 scans the pattern filling area on both sides of the battery. Further, in order to achieve a better processing effect, more than two linear contact electrodes can be used, and other positions in the second area (the straight line where the Pad is located) can be contacted. Similarly, Figure 8 It also shows a schematic diagram of the laser scanning area when the first electrode and the second electrode contact the back contact battery at the first processing station B, Figure 8 and Figure 7 The difference is that at least two linear contact electrodes are asymmetrically arranged on both sides of the midline of the back contact battery surface, thus, Figure 8 and Figure 7 The difference also includes that the two laser scanning areas on the cell surface under the two processing stations are separated (for the convenience of display, Figure 8 (b) The cell was not rotated 90°).

[0057] in, Figure 7 The battery cell shown is a standard whole cell without dicing. As mentioned above, the battery placed on the carrier 100 can also be two halves of a diced cell. When the two halves are diced, the two halves can be close together without a gap or separated by a certain gap. If the two halves are without a gap, the schematic diagram of the laser scanning area when the first electrode and the second electrode contact the back contact battery can refer to Figure 7 ; When the two halves of the sheet have been cut apart with a certain gap, the schematic diagram of the laser scanning area when the first electrode and the second electrode contact the back contact battery can be considered to be Figure 7 Divide into two and keep a certain distance between them.

[0058] It should be noted that, Figure 7 (b) Relative Figure 7 (a) Rotated 90°. At this time, it is assumed that the carrier device 100 is the turntable module described below, and the two processing stations are arranged adjacent to each other. The carrier 110 in the turntable module rotates 90° at a time under the drive of the rotation drive mechanism 120. Therefore, when the back contact battery of the first processing station B moves to the second processing station C, the battery cell is equivalent to rotating 90°. Correspondingly, except for the power supply 210 in the electric input module 200, the corresponding structures are rotated 90°. Of course, if the first processing station and the second processing station are arranged in a linear manner (for example, the interactive module that moves along a straight line in the prior art only needs at least two carriers, the two carriers can move horizontally and linearly and move up and down, and the two processing stations are arranged on the horizontal linear motion path), it is also possible, and then there is no need to rotate 90°.

[0059] As another example, Figure 5 As shown, the carrier device 100 is a turntable module, which includes a rotary drive mechanism 120, a horizontally arranged and centrally symmetrical support frame 130, and a plurality of carriers 110 mounted on the support frame 130; the drive shaft of the rotary drive mechanism 120 is vertically arranged and connected to the center of the support frame 130, and the distance between each carrier 110 and the center of the support frame 130 is equal. The rotary drive mechanism 120 is used to drive the carrier 110 to pass through the processing station. The carrier device 100 in the form of a turntable module can not only realize mass production, but also has a simple equipment structure and a simple implementation method.

[0060] As another example, Figure 6 As shown, the turntable module includes four carriers 110, and the number of processing stations is two, namely the first processing station B and the second processing station C. The four carriers 110 are equidistantly distributed along the circumference of the support frame 130, and the support frame 130 can be a cross-shaped support frame. The first processing station B and the second processing station C are respectively provided with a laser processing module 300 and an electric input module 200; the first electrode and the second electrode corresponding to the first processing station B contact the first area of ​​the battery cell, and the first electrode and the second electrode corresponding to the second processing station C contact the second area of ​​the battery cell. The first area and the second area are arranged along the second direction, the second direction is perpendicular to the first direction, and the first area and the second area are different. Specifically, the arrangement positions of the first electrode and the second electrode, the way of contacting the battery, and the area scanned by the laser processing module 300 refer to the above description. The carrier device 100 has four stations, namely, the loading and positioning station A, the first processing station B, the second processing station C, and the unloading station D. A visual positioning mechanism 400 is arranged above the carrier platform 110 corresponding to the loading and positioning station A. The visual positioning mechanism 400 is, for example, a commonly used CCD camera, which is used to obtain the position of the back contact battery on the carrier device 100, so that the horizontal position adjustment mechanism 290 adjusts the position of the first electrode and the second electrode according to the position of the back contact battery to improve the processing accuracy. The rotary drive mechanism 120 is used to drive each carrier platform 110 to pass through the loading and positioning station A, the first processing station B, the second processing station C, and the unloading station D in sequence.

[0061] As another example, Figure 6As shown, a loading transmission device 500 and a loading handling device 600 are provided corresponding to the loading positioning station A, and a unloading transmission device 700 and an unloading handling device 800 are provided corresponding to the unloading station D. A positioning station E is provided between the loading transmission device 500 and the carrying device 100, and a position adjustment mechanism is provided at the positioning station E. The position of the loaded battery cell can be adjusted by the position adjustment mechanism to improve the processing accuracy. This position adjustment mechanism can be a conventional structure in the prior art, or it can be a structure designed according to actual needs, for example, including a driver and four drive plates connected to the driver and arranged around the battery cell, and the driver brings the four drive plates to move toward the center of the battery at the same time to achieve position adjustment based on the center. Since this position adjustment mechanism is not the focus of this application, it will not be described here.

[0062] As another example, Figure 6 As shown, the loading and conveying device 500 is a conveying belt, and the loading and handling device 600 is an L-shaped rotating mechanical arm, which includes a first rotating driving actuator and two mechanical arms connected to the first rotating driving actuator and perpendicular to each other, and the ends of the two mechanical arms are respectively connected to suction cups for adsorbing the battery sheet downward, and the rotating mechanical arm can rotate 90° at a time; wherein, the loading and conveying device 500, the loading and positioning station A, the unloading station D, and the unloading and conveying device 700 are arranged in a colinear manner; the position adjustment mechanism is arranged on the mid-perpendicular line between the output end of the loading and conveying device 500 and the loading and positioning station A, that is, the position adjustment mechanism is arranged at the position directly below the suction cup when the L-shaped rotating mechanical arm stops rotating 90°; the first rotating driving actuator with the suction cups on the two mechanical arms are respectively located above the loading and conveying device and the position adjustment mechanism at the same time, or respectively located above the position adjustment mechanism and the supporting platform corresponding to the loading and positioning station A at the same time. The loading and handling device 520 is arranged in the form of an L-shaped rotating mechanical arm, and the position adjustment mechanism is arranged on the rotating path of the rotating mechanical arm, which can greatly improve the production capacity.

[0063] During operation, the loading and conveying device 500 transfers the battery cell to the bottom of the suction cup of the L-shaped rotating mechanical arm. The suction cup of the L-shaped rotating mechanical arm sucks the battery cell and rotates 90° to move the battery cell to the positioning station E. After the positioning is completed by the position adjustment mechanism, the L-shaped rotating mechanical arm rotates another 90°, and the positioned battery cell is transferred to the loading station A, and the battery cell is placed on the supporting platform 110 corresponding to the loading station A. It should be noted that the two suction cups of the L-shaped rotating mechanical arm can work at the same time, that is, one suction cup sucks the battery cell on the loading and conveying device 500, and the other suction cup sucks the battery cell that has been positioned. After the L-shaped rotating mechanical arm rotates 90°, one suction cup places the battery cell obtained from the loading and conveying device 500 on the position adjustment mechanism for positioning, and the other suction cup places the positioned battery cell on the supporting platform 110.

[0064] As another example, Figure 6 As shown, the unloading transmission device 700 is a conveyor belt, and the unloading handling device 800 is a straight-line rotary robot arm, including a second rotary drive actuator and a straight-line robot arm connected to the second rotary drive actuator, and the end of the robot arm is connected to a suction cup that sucks the battery cell downward; the second rotary drive actuator carries the suction cup on the straight-line robot arm to move back and forth above the unloading transmission device and the supporting platform corresponding to the unloading station. By adopting a straight-line rotary robot arm, because it is a rotary drive mode, the speed of moving with the battery cell is faster, and the production capacity can be further improved while meeting the consistency of the loading and unloading orientation of the battery cell. In addition, the processing system in this layout mode can also make the orientation of the battery cell during loading consistent with the orientation of the battery cell during unloading.

[0065] 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.

[0066] 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 device for back contact cells, characterized in that: The invention comprises a carrying device for carrying a back-contact battery, the carrying device has a processing station, a laser processing module and an electric input module are arranged corresponding to the processing station, the electric input module comprises a power supply, a first electrode and a second electrode located above the carrying device, the first electrode and the second electrode are respectively connected to the positive electrode and the negative electrode of the power supply; the first electrode and the second electrode are respectively used to make electrical contact with the positive electrode and the negative electrode of the back-contact battery, and the laser processing module is used to emit a laser beam to scan the battery sheet when a reverse voltage is applied to the back-contact battery; Among them, the first electrode includes a plurality of first contact units, the second electrode includes a plurality of second contact units, the plurality of first contact units and the plurality of second contact units are arranged along a first direction to form at least one linear contact electrode, and the first contact units and the second contact units in the linear contact electrode are alternately arranged.

2. The laser induced sintering device for back contact cells according to claim 1, characterized in that: The electrical input module also includes at least one strip bracket, which is extended along the first direction and is made of insulating material. A plurality of the first contact units and a plurality of the second contact units are fixed on the strip bracket and at least the lower ends extend out of the strip bracket for electrical contact with the positive electrode and the negative electrode of the back contact battery.

3. The laser induced sintering device for back contact cells according to claim 2, characterized in that: A plurality of the first contact units and a plurality of the second contact units are arranged along a first direction to form a plurality of the linear contact electrodes, and a plurality of the linear contact electrodes are arranged at intervals along a second direction, and the second direction is perpendicular to the first direction; the electrical input module includes a plurality of the strip brackets corresponding to the number of the linear contact electrodes.

4. The laser induced sintering device for back contact cells according to claim 3, characterized in that: A plurality of the first contact units and a plurality of the second contact units are arranged along the first direction to form at least two linear contact electrodes, and at least two linear contact electrodes are symmetrically or asymmetrically arranged on both sides of a center line of a back contact battery surface.

5. The laser induced sintering device for back contact cells according to claim 4, characterized in that: At least two of the linear contact electrodes arranged on both sides of the midline of the back contact battery surface are respectively called the first linear contact electrode and the second linear contact electrode, wherein the first contact unit in the first linear contact electrode corresponds to the Pad point at the odd column position, and the second contact unit corresponds to the Pad point at the even column position, and the second contact unit of the second linear contact electrode corresponds to the Pad point at the odd column position, and the first contact unit corresponds to the Pad point at the even column position.

6. The laser induced sintering device for back contact cells according to claim 2, characterized in that: The electrical input module also includes a first conductive strip connected to the plurality of first contact units and a second conductive strip connected to the plurality of second contact units. The first conductive strip and the second conductive strip do not contact each other. The first conductive strip and the second conductive strip are both arranged along the first direction and are electrically connected to the positive and negative poles of the power supply, respectively.

7. The laser induced sintering device for back contact cells according to claim 6, characterized in that: The first contact unit and the second contact unit pass through the strip bracket longitudinally, and the upper and lower ends extend out of the strip bracket respectively; wherein, the electrical input module also includes a strip-shaped intermediate insulating sheet arranged along the first direction, the first conductive sheet, the intermediate insulating sheet, and the second conductive sheet are arranged side by side above the strip bracket, the intermediate insulating sheet is used to separate the first conductive sheet and the second conductive sheet, the first conductive sheet is connected to one end of the plurality of the first contact units extending above the strip bracket, and the second conductive sheet is connected to one end of the plurality of the second contact units extending above the strip bracket.

8. The laser induced sintering device for back contact cells according to claim 6, characterized in that: The first contact unit and the second contact unit pass through the strip bracket longitudinally, and an upper and lower layer of hollow patterns are arranged at the middle position of the strip bracket, and each layer of the hollow pattern includes a plurality of hollow openings arranged at intervals along the first direction, and the hollow openings are used to expose part of the first contact unit and part of the second contact unit; wherein the upper layer of the hollow openings and the lower layer of the hollow openings are alternately arranged and correspond to the first contact unit and the second contact unit respectively, the first conductive sheet is connected to the parts of the plurality of the first contact units exposed outside the hollow openings, and the second conductive sheet is connected to the parts of the plurality of the second contact units exposed outside the hollow openings.

9. The laser induced sintering device for back contact cells according to claim 2, characterized in that: The electrical input module also includes a longitudinal displacement mechanism, a horizontal position adjustment mechanism connected to the longitudinal displacement mechanism via a first frame, and the strip bracket is connected to the horizontal position adjustment mechanism via a second frame. The horizontal position adjustment mechanism is used to drive the first electrode and the second electrode to move unidirectionally in the horizontal plane or to rotate in the horizontal plane at the same time.

10. The laser induced sintering device for back contact cells according to claim 9, characterized in that: The horizontal position adjustment mechanism includes three driving mechanisms arranged in a right triangle, wherein the driving directions of the two driving mechanisms located on the hypotenuse are parallel to each other, and the driving direction of the third driving mechanism is perpendicular to the driving directions of the two driving mechanisms located on the hypotenuse.

11. The laser induced sintering device for back contact cells according to claim 9, characterized in that: A visual positioning mechanism is provided above the carrying device and before the processing station, for obtaining the position of the back contact battery on the carrying device so that the horizontal position adjustment mechanism can adjust the positions of the first electrode and the second electrode according to the position of the back contact battery.

12. The laser induced sintering device for back contact cells according to claim 1, characterized in that: The interval between the first contact unit and the second contact unit in the linear contact electrode is n times the distance between adjacent Pad points on the back contact cell, where n≥1.

13. The laser induced sintering device for back contact cells according to any one of claims 1 to 12, characterized in that: There are two processing stations, namely a first processing station and a second processing station, and the first processing station and the second processing station are respectively provided with the laser processing module and the electric input module; The first electrode and the second electrode corresponding to the first processing station contact the first area of ​​the back contact battery surface, and the first electrode and the second electrode corresponding to the second processing station contact the second area of ​​the back contact battery surface. The first area and the second area are arranged along a second direction, the second direction is perpendicular to the first direction, and the first area and the second area are different.

14. The laser induced sintering device for back contact cells according to any one of claims 1 to 12, characterized in that: The carrying device is a turntable module, which includes a rotary drive mechanism, a horizontally arranged and centrally symmetrical support frame, and a plurality of carrying platforms installed on the support frame; the driving shaft of the rotary drive mechanism is vertically arranged and connected to the center of the support frame, and the distance from each carrying platform to the center of the support frame is equal. The rotary drive mechanism is used to drive the carrying platform to pass through the processing station.

15. The laser induced sintering device for back contact cells according to claim 14, characterized in that: The turntable module includes four carriers, the number of the processing stations is two, namely the first processing station and the second processing station, the first processing station and the second processing station are respectively provided with the laser processing module and the electric input module; The first electrode and the second electrode corresponding to the first processing station contact the first area of ​​the battery cell, and the first electrode and the second electrode corresponding to the second processing station contact the second area of ​​the battery cell, the first area and the second area are arranged along a second direction, the second direction is perpendicular to the first direction, and the first area and the second area are different; The carrying device has four workstations, namely the loading and positioning station, the first processing station, the second processing station, and the unloading station. A visual positioning mechanism is arranged above the carrying platform corresponding to the loading and positioning station. The rotary drive mechanism is used to drive the carrying platform to pass through the loading and positioning station, the first processing station, the second processing station, and the unloading station in sequence.

16. The laser induced sintering device for back contact cells according to claim 15, characterized in that: A loading transmission device and a loading handling device are provided corresponding to the loading positioning station, a unloading transmission device and a unloading handling device are provided corresponding to the unloading station, a positioning station is provided between the loading transmission device and the carrying device, and a position adjustment mechanism is provided at the positioning station.

17. The laser induced sintering device for back contact cells according to claim 16, characterized in that: The loading and conveying device is a conveying belt, and the loading and handling device is an L-shaped rotating mechanical arm, which includes a first rotating driving actuator and two mechanical arms connected to the first rotating driving actuator and perpendicular to each other, and the ends of the two mechanical arms are respectively connected to suction cups for adsorbing the battery sheets downward, and the L-shaped rotating mechanical arm can rotate 90° at a time; Among them, the loading and conveying device, the loading and positioning station, the unloading station, and the unloading and conveying device are arranged in a colinear manner; the position adjustment mechanism is arranged on the mid-perpendicular line between the output end of the loading and conveying device and the loading and positioning station, that is, the position adjustment mechanism is arranged at a position directly below the suction cup when the L-shaped rotating robotic arm rotates 90° and stops; the first rotary drive actuator with the suction cups on the two robotic arms are respectively and simultaneously located above the loading and conveying device and the position adjustment mechanism, or are respectively and simultaneously located above the position adjustment mechanism and the supporting platform corresponding to the loading and positioning station.

18. The laser induced sintering device for back contact cells according to claim 16, characterized in that: The unloading transmission device is a conveyor belt, and the unloading handling device is a straight-line rotating robotic arm, which includes a second rotating drive actuator and a straight-line robotic arm connected to the second rotating drive actuator, and the end of the robotic arm is connected to a suction cup for downwardly adsorbing the battery cell; the second rotating drive actuator carries the suction cup on the straight-line robotic arm to move back and forth between the unloading transmission device and the loading platform corresponding to the unloading station.

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