Laser-induced sintering device of back contact battery

Abstract

The utility model provides a laser-induced sintering device of a back contact battery, which comprises a bearing device, the bearing device is provided with a processing station, an electric input module and a laser processing module are arranged corresponding to the processing station, and the electric input module comprises a first electrode and a second electrode; the positive electrode and the negative electrode are respectively connected with a power supply and are respectively electrically contacted with a positive electrode and a negative electrode of a back contact battery; the first electrode comprises a plurality of first contact units which are arranged into at least one first contact electrode arranged along the first direction, and the second electrode comprises a plurality of second contact units which are arranged into at least one second contact electrode arranged along the first direction; the first contact electrodes and the second contact electrodes are arranged side by side in the second direction, the second direction is perpendicular to the first direction, and the first contact units and the second contact units are arranged in a staggered mode in the second direction. According to the laser-induced sintering device, laser-induced sintering processing of the back contact type battery can be realized, and the photoelectric conversion efficiency of the back contact type battery 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 the back-contact battery, 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 first electrode and a second electrode, the first electrode and the second electrode being respectively used to connect to the positive electrode and the negative electrode of a power source, and the first electrode and the second electrode being respectively used to electrically contact the positive electrode and the negative electrode of the back-contact battery, the laser processing module being used to emit a laser beam to scan the battery sheet while a reverse voltage is applied to the back-contact battery;

[0005] Among them, the first electrode includes a plurality of first contact units, and the plurality of first contact units are arranged into at least one first contact electrode arranged along a first direction; the second electrode includes a plurality of second contact units, and the plurality of second contact units are arranged into at least one second contact electrode arranged along the first direction; the first contact electrode and the second contact electrode are arranged side by side along a second direction, the second direction is perpendicular to the first direction, and the first contact unit and the second contact unit are staggered in the second direction.

[0006] Furthermore, the distance between two adjacent first contact units in a first contact electrode is 2N times the distance between adjacent main grids or adjacent gate line Pad points on the back contact cell, where N is a natural number; the distance between two adjacent second contact units in a second contact electrode is 2N times the distance between adjacent main grids or adjacent gate line Pad points on the back contact cell, where N is a natural number.

[0007] Further, the number of the first contact electrodes is equal to or different from the number of the second contact electrodes.

[0008] Furthermore, both the first contact unit and the second contact unit are probes.

[0009] Further, the first electrode and the second electrode are located above the carrying device, or the first electrode and the second electrode are located below a carrying surface of the carrying device that carries a back-contact battery.

[0010] Further, a plurality of the first contact units are arranged into at least M first contact electrodes, at least M of the first contact electrodes are arranged along the second direction, and a plurality of the second contact units are arranged into at least M second contact electrodes, at least M of the second contact electrodes are arranged along the second direction;

[0011] At least M first contact electrodes and at least M second contact electrodes 220 form at least M electrical input units, and one electrical input unit includes one first contact electrode and one second contact electrode; wherein M is a natural number greater than or equal to 2.

[0012] Furthermore, M is equal to the number of multiple slices of the standard battery cell carried by the carrying device.

[0013] Further, the first contact unit of one of the two adjacent electrical input units corresponds to the gate line or Pad point at the odd column position, and the second contact unit corresponds to the gate line or Pad point at the even column position; and the first contact unit of the other of the two adjacent electrical input units corresponds to the gate line or Pad point at the even column position, and the second contact unit corresponds to the gate line or Pad point at the odd column position;

[0014] Alternatively, the first contact units in all the electrical input units correspond to the gate lines or Pad points at odd-numbered column positions, and the second contact units correspond to the gate lines or Pad points at even-numbered column positions;

[0015] Alternatively, the first contact units in all the electrical input units correspond to the gate lines or Pad points at even-numbered column positions, and the second contact units correspond to the gate lines or Pad points at odd-numbered column positions.

[0016] Furthermore, M=2, that is, the electrical input module includes at least two electrical input units, and the at least two electrical input units are symmetrically or asymmetrically arranged on both sides of the center line of the back contact battery surface.

[0017] Furthermore, the electrical input module further comprises at least one strip-shaped support frame, the support frame is extended along the first direction, and the support frame is made of insulating material;

[0018] The first contact electrode and the second contact electrode are fixed on the support frame, and one end of the first contact unit and one end of the second contact unit extend out of the support frame for electrical contact with the positive electrode and the negative electrode of the back contact battery.

[0019] Further, at least one of the first contact electrodes and at least one of the second contact electrodes form at least one electrical input unit, one electrical input unit includes one of the first contact electrodes and one of the second contact electrodes, the number of the support frames is the same as the number of the electrical input units, and one of the support frames corresponds to one of the electrical input units.

[0020] Further, the electrical input module further comprises at least one first bar-shaped bracket and at least one second bar-shaped bracket, the first bracket and the second bracket are both extended along the first direction, the number of the first brackets is the same as the number of the first contact electrodes, and the number of the second brackets is the same as the number of the second contact electrodes;

[0021] Among them, one of the first contact electrodes is fixed on one of the first brackets, and one end of the first contact unit extends out of the first bracket for electrical contact with one of the positive electrode or the negative electrode of the back contact battery; one of the second contact electrodes is fixed on one of the second brackets, and one end of the second contact unit extends out of the second bracket for electrical contact with the other of the positive electrode or the negative electrode of the back contact battery.

[0022] Furthermore, the first bracket and the second bracket are both made of conductive material, and the first bracket and the second bracket are used to connect to the positive electrode and the negative electrode of the power supply respectively.

[0023] Furthermore, the first bracket and the second bracket are both made of insulating material.

[0024] Further, the first contact unit and the second contact unit respectively pass through the first bracket and the second bracket longitudinally, the electrical input module further comprises at least one first conductive strip connected to the first contact electrode, at least one second conductive strip connected to the second contact electrode, the first conductive strip and the second conductive strip are both arranged along the first direction, and the number of the first conductive strips is the same as the number of the first contact electrodes, and the number of the second conductive strips is the same as the number of the second contact electrodes;

[0025] The first conductive sheet contacts all the first contact units in the corresponding first contact electrode, the second conductive sheet contacts all the second contact units in the corresponding second contact electrode, and the first conductive sheet and the second conductive sheet are electrically connected to the positive electrode and the negative electrode of the power supply respectively.

[0026] Further, the first contact unit and the second contact unit respectively pass through the first bracket and the second bracket longitudinally, the electrical input module further comprises at least one first conductive strip connected to the first contact electrode, at least one second conductive strip connected to the second contact electrode, the first conductive strip and the second conductive strip are both arranged along the first direction, and the number of the first conductive strips is the same as the number of the first contact electrodes, and the number of the second conductive strips is the same as the number of the second contact electrodes;

[0027] Among them, a plurality of hollow openings are provided at the middle positions of the first bracket and the second bracket, and the hollow openings are used to expose part of the first contact unit and part of the second contact unit; and the first conductive sheet contacts with the part of all the first contact units in the first contact electrodes corresponding to it exposed outside the hollow openings, and the second conductive sheet contacts with the part of all the second contact units in the second contact electrodes corresponding to it exposed outside the hollow openings, and the first conductive sheet and the second conductive sheet are electrically connected to the positive pole and the negative pole of the power supply respectively.

[0028] 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, the first contact electrode and the second contact electrode are connected to the horizontal position adjustment mechanism through a second frame, and 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.

[0029] Furthermore, a visual positioning mechanism is provided before the processing station for obtaining the position of the back contact battery on the carrying device so that the horizontal position adjustment mechanism adjusts the positions of the first electrode and the second electrode according to the position of the back contact battery.

[0030] 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;

[0031] 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.

[0032] Furthermore, 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, the distance between each of the carrying platforms and the center of the support frame is equal, and the rotary drive mechanism is used to drive the carrying platforms through the processing station.

[0033] 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;

[0034] 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;

[0035] 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.

[0036] Compared with the prior art, the laser induced sintering device for back-contact cells proposed in this application can realize laser induced sintering processing of back-contact cells to improve the photoelectric conversion efficiency of back-contact cells. In addition, since the first contact unit and the second contact unit are divided into two strips, the distance between adjacent contact units on the same contact electrode of this patent can be larger, thereby providing more options for brackets for connecting multiple contact units in series, making the brackets more convenient and simple during processing, and more importantly, the cumulative error caused by the contact unit spacing is small, and the alignment accuracy between the contact unit and the cell (the pad point or grid line on it) will be high. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] 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.

[0038] 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.

[0039] Figure 1 A schematic diagram of the structure of a laser induced sintering device for a back contact battery according to an embodiment of the present application;

[0040] Figure 2 A schematic diagram of the structure of a first contact electrode and a second contact electrode according to an embodiment of the present application;

[0041] Figure 3 A schematic diagram of the structure of a first contact electrode and a second contact electrode in another embodiment provided by the present application;

[0042] Figure 4 A schematic diagram of the structure of a first contact electrode and a second contact electrode in another embodiment provided by the present application;

[0043] Figure 5 A schematic diagram of the structure of an electric input module according to an embodiment of the present application;

[0044] Figure 6 A schematic diagram of the structure of an electric input module according to another embodiment of the present application;

[0045] Figure 7 A schematic diagram of the structure of an electric input module according to another embodiment of the present application;

[0046] Figure 8 A schematic diagram of the structure of a carrying device according to an embodiment of the present application;

[0047] Fig. 9 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

[0048] 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.

[0049] 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.

[0050] like Figure 1As 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 has a processing station, and an electric input module and a laser processing module 300 are arranged corresponding to the processing station, the electric input module includes a first electrode and a second electrode, the first electrode and the second electrode are respectively used to connect to the positive electrode and the negative electrode of the power supply 230; 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 cell when a reverse voltage is applied to the back-contact battery; wherein, the first electrode includes a plurality of first contact units 10, and the plurality of first contact units 10 are arranged into at least one first contact electrode 210 arranged along the first direction, and the second electrode includes a plurality of second contact units 20, and the plurality of second contact units 20 are arranged into at least one second contact electrode 220 arranged along the first direction; the first contact electrode 210 and the second contact electrode 220 are arranged side by side along the second direction, the second direction is perpendicular to the first direction, and the first contact unit 10 and the second contact unit 20 are staggered in the second direction. Specifically, the first electrode and the second electrode can be located above the carrier 100, in which case the side of the back-contact battery having the positive electrode and the negative electrode faces upward; or the first electrode and the second electrode can be located below the carrier surface of the carrier 100 that carries the back-contact battery, in which case the side of the back-contact battery having the positive electrode and the negative electrode faces downward. When the first electrode and the second electrode are located below the carrier surface, there can be a variety of implementation methods. For example, the carrier 100 (carrier platform) includes a hollow portion, and the hollow portion allows the first electrode and the second electrode to pass through to contact the positive electrode and the negative electrode of the back-contact battery. For another example, the first electrode and the second electrode are connected to the carrier 100, as long as the first electrode and the second electrode can contact the side of the back-contact battery having the positive electrode and the negative electrode from below. This embodiment Figure 1 The above of the carrying device 100 is taken as an example for detailed description. Figure 1 The X-axis direction shown in , the second direction is, for example, Figure 1 In the Y-axis direction shown, generally, the first direction is perpendicular to the busbar direction of the cell, and the first contact electrode 210 and the second contact electrode 220 span across multiple busbars. Of course, the plurality of first contact units 10 and the plurality of second contact units 20 can also be arranged into a plurality of first contact electrodes 210 and second contact electrodes 220 that are separately arranged side by side, for example Figure 2 , Figure 3 , Figure 4 As shown in FIG. 1 , when there are a plurality of first contact electrodes 210 and a second contact electrode 220 that are separately disposed side by side, the plurality of contact electrodes are arranged along the second direction.

[0051] The laser induced sintering device for the back contact cell proposed in this application can realize the laser induced sintering processing of the back contact cell to improve the photoelectric conversion efficiency of the back contact cell. In addition, since the first contact unit and the second contact unit are divided into two lines, the distance between adjacent contact units on the same contact electrode of this patent can be larger, thereby providing more options for the bracket for connecting multiple contact units in series, making the bracket more convenient and simple during processing, and more importantly, the cumulative error caused by the contact unit spacing is small, and the alignment accuracy between the contact unit and the cell (the pad point or grid line on it) will be high.

[0052] When the first electrode and the second electrode are located above the carrier 100, in order to facilitate the electrical contact between the first contact unit 10 and the second contact unit 20 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. In addition, the electrode positions of the back contact battery that the first contact unit 10 and the second contact unit 20 contact are generally the Pad points or grid lines on the electrodes. Among them, the first contact unit 10 and the second contact unit 20 are staggered in the second direction because the positive electrode and the negative electrode on the back contact battery are staggered, and this patent separates all the first contact units 10 and the second contact units 10 from being colinear, thereby forming a structure such as Figure 1 The first contact units 10 and the second contact units 20 are arranged alternately in the second direction.

[0053] 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 and a field mirror. According to actual needs, the laser processing module 300 may also include other required optical devices. When the first electrode and the second electrode are located above the carrier 100, the laser processing module 300 is located above the first electrode and the second electrode.

[0054] Among them, the first contact unit 10 and the second contact unit 20 can both be probes, preferably elastic probes. The form of the elastic probe can be a hollow structure probe in the prior art plus a spring, or the probe itself can be designed as a solid elastic structure. Furthermore, the distance between two adjacent first contact units 10 in a first contact electrode 210 is 2N times the distance between adjacent main grids or adjacent gate line Pad points on the back contact cell, where N is a natural number; the distance between two adjacent second contact units 20 in a second contact electrode 220 is 2N times the distance between adjacent main grids or adjacent gate line Pad points on the back contact cell, where N is a natural number, that is, the distance between two adjacent contact units can be 2 times, 4 times, 6 times, etc., of the distance between adjacent main grids or adjacent gate line Pad points. When N=1, the distance between two adjacent first contact units 10 is twice the distance between adjacent main grids or adjacent gate line Pad points, that is, Figure 2 As shown, of course N can also be 2, 3, 4 or more.

[0055] At present, in order to improve the photoelectric conversion efficiency, the back-contact battery is made into a multi-slice form (two or more slices) when it is used. The multi-slice can be obtained by slicing a standard whole piece, or it can be formed by directly making the main grid line into multiple segments on the standard whole piece without slicing. Among them, the back-contact battery placed on the carrier 100 can be either a standard whole piece that has not been sliced, or a plurality of slices that have been sliced. When it is a plurality of slices that have been sliced, the plurality of slices can be close together without gaps, or they can be separated by a certain gap. When the placed back-contact battery is in the form of multiple slices (regardless of whether it is formed by slicing or not slicing the main grid line segment), each slice corresponds to at least one first contact electrode 210 and one second contact electrode 220, so that each slice can be laser-induced sintered.

[0056] As another embodiment, the number of the first contact electrodes 210 is equal to or different from the number of the second contact electrodes 220. It should be noted that when a standard whole piece is placed on the carrier device 100, it includes at least one first contact electrode 210 and at least one second contact electrode 220 (because it may not be a multi-piece form at this time, it can be at least one or more first contact electrodes 210 and second contact electrodes 220; it may also be a multi-piece form, in which case each piece corresponds to at least one first contact electrode 210 and second contact electrode 220). When the placed back contact battery is in a multi-piece form, for example, two pieces, it includes at least two first contact electrodes 210 and two second contact electrodes 220. Of course, it can also be more. When there are more contact electrodes, the number of first contact electrodes 210 and second contact electrodes 220 corresponding to each piece can be equal or different, for example Figure 3As shown, one of the slices has two first contact electrodes 210 and one second contact electrode 220 .

[0057] As another embodiment, a plurality of first contact units 10 are arranged into at least M first contact electrodes 210, at least M first contact electrodes 210 are arranged along the second direction, and a plurality of second contact units 20 are arranged into at least M second contact electrodes 220, at least M second contact electrodes 220 are arranged along the second direction; wherein at least M first contact electrodes 210 and at least M second contact electrodes 220 form at least M electric input units 1, and one electric input unit 1 includes a first contact electrode 210 and a second contact electrode 220; wherein M is a natural number greater than or equal to 2, and preferably, when the first electrode and the second electrode are located above the carrier 100, the sum of the number of the first contact electrodes 210 and the second contact electrodes 220 is ≤ half of the number of pad points on the battery cell along the second direction, so as to help solve the problem of the electric input module blocking the laser. Further, M is equal to the number of multi-slices of the standard battery cell carried by the carrier 100. As mentioned above, in order to improve the photoelectric conversion efficiency, the back contact battery will be made into two or more slices. In order to ensure that each slice can undergo laser induced sintering, each slice corresponds to at least one first contact electrode 210 and one second contact electrode 220, thereby at least M first contact electrodes 210 and at least M second contact electrodes 220 form at least M electrical input units 1.

[0058] As another embodiment, when the back-contact battery cell placed on the supporting device 100 is a plurality of slices, the plurality of slices are basically aligned side by side. At this time, the Pad points on the positive electrode and the Pad points on the negative electrode (or the positive main grid line and the negative main grid line) in two adjacent electrical input units 1 on the plurality of slices can be staggered, or the Pad points on the positive electrodes on the plurality of slices are all located in the same column, and the Pad points on the negative electrodes are all located in the same column. When the Pad point on the positive electrode and the Pad point on the negative electrode (or the positive main grid line and the negative main grid line) in two adjacent electrical input units 1 on multiple slices are staggered, correspondingly, the first contact unit 10 of one of the two adjacent electrical input units 1 corresponds to the grid line or Pad point contacting the odd-numbered column position, and the second contact unit 20 corresponds to the grid line or Pad point contacting the even-numbered column position; and the first contact unit 10 of the other of the two adjacent electrical input units 1 corresponds to the grid line or Pad point contacting the even-numbered column position, and the second contact unit 20 corresponds to the grid line or Pad point contacting the odd-numbered column position. For example, when the battery cell consists of 5 slices, the first contact unit 10 of the electrical input unit 1 corresponding to the 1st, 3rd and 5th slices corresponds to the gate line or Pad point contacting the odd-numbered column position, and the second contact unit 20 corresponds to the gate line or Pad point contacting the even-numbered column position; the first contact unit 10 in the electrical input unit 1 corresponding to the 2nd and 4th slices corresponds to the gate line or Pad point contacting the even-numbered column position, and the second contact unit 20 corresponds to the gate line or Pad point contacting the odd-numbered column position.

[0059] Alternatively, when the Pad points on the positive electrodes of multiple slices are all located in the same column, and the Pad points on the negative electrodes are all located in the same column, correspondingly, the first contact unit 10 of all the electrical input units corresponds to the gate line or Pad point at the odd column position, and the second contact unit 20 corresponds to the gate line or Pad point at the even column position; or, the first contact unit 10 of the electrical input unit corresponds to the gate line or Pad point at the even column position, and the second contact unit 20 corresponds to the gate line or Pad point at the odd column position. All of the above arrangements are possible, and the arrangement of the first contact unit 10 and the second contact unit 20 is specifically performed according to the actual situation of the battery slice.

[0060] Furthermore, when M=2, for example Figure 2 , Figure 4 As shown, the electric input module 1 includes at least two electric input units 1, and the at least two electric input units 1 are symmetrically or asymmetrically arranged on both sides of the center line of the back contact battery surface; wherein, Figure 2 and Figure 4The schematic is a symmetrical arrangement, and an asymmetrical arrangement is also possible. It should be noted that when the back-contact battery sheet placed on the carrier device 100 is two slices, the two slices are basically aligned side by side on the carrier device 100. At this time, the Pad points on the positive electrode and the Pad points on the negative electrode (or the positive main grid line and the negative main grid line) on the two slices can be staggered, or the Pad points on the positive electrodes on the two slices are all located in the same column, and the Pad points on the negative electrodes are all located in the same column. The Pad points on the positive electrodes and the Pad points on the negative electrodes (or the positive main grid line and the negative main grid line) on the two slices are staggered as an example for further explanation. For example, the Pad points at the odd column positions of one slice all correspond to the positive electrode, and the Pad points at the even column positions all correspond to the negative electrode, and the Pad points at the odd column positions of the other slice all correspond to the negative electrode, and the Pad points at the even column positions all correspond to the positive electrode. Therefore, the first contact unit 10 disposed on one side of the midline of the back contact battery surface corresponds to the grid lines or pad points at odd-numbered columns, and the second contact unit 20 corresponds to the grid lines or pad points at even-numbered columns; and the first contact unit 10 disposed on the other side of the midline of the back contact battery surface corresponds to the grid lines or pad points at even-numbered columns, and the second contact unit 20 corresponds to the grid lines or pad points at odd-numbered columns. Of course, when the battery cell is divided into more slices, the relative positions of the first contact unit 10 and the second contact unit 20 on different slices are adjusted accordingly according to the positions of the pad points on the positive electrode and the pad points on the negative electrode on different slices.

[0061] As another example, Figure 2 As shown, the electric input module also includes at least one bar-shaped support frame 30, which is extended along the first direction and made of insulating material, thereby preventing the first contact unit 10 and the second contact unit 20 from being connected to form a short circuit; wherein the first contact electrode 210 and the second contact electrode 220 are fixed on the support frame 30, and one end of the first contact unit 10 and one end of the second contact unit 20 extend out of the support frame 30 to be used for electrical contact with the positive electrode and the negative electrode of the back contact battery. Since the electric input module can include multiple first contact electrodes 210 and multiple second contact electrodes 220, all contact electrodes can be fixed on one support frame 30, or several of them can share one support frame 30.

[0062] Preferably, at least one first contact electrode 210 and at least one second contact electrode 220 form at least one electric input unit 1, and one electric input unit 1 includes a first contact electrode 210 and a second contact electrode 220. The number of support frames 30 is the same as the number of electric input units 1, and one support frame 30 corresponds to one electric input unit, thereby making the processing requirements for the support frame 30 relatively low, and reducing the laser obstruction of the support frame 30.

[0063] As another example, Figure 5 , Figure 6 As shown, the electric input module also includes at least one first bar-shaped bracket 40 and at least one second bar-shaped bracket 50, both of which are extended along the first direction, the number of the first bracket 40 is the same as the number of the first contact electrodes 210, and the number of the second bracket 50 is the same as the number of the second contact electrodes 220; wherein, one first contact electrode 210 is fixed on one first bracket 40, and one end of the first contact unit 10 extends out of the first bracket 40 for electrical contact with one of the positive electrode or the negative electrode of the back contact battery; one second contact electrode 220 is fixed on one second bracket 50, and one end of the second contact unit 20 extends out of the second bracket 50 for electrical contact with the other of the positive electrode or the negative electrode of the back contact battery. The first contact electrode and the second contact electrode are fixed by two brackets respectively, and since the distance between adjacent contact units on the same contact electrode can be larger, the bracket has more options, and the bracket is more convenient and simple during processing.

[0064] As another embodiment, the first bracket 40 and the second bracket 50 are both made of conductive material, and the first bracket 40 and the second bracket 50 are respectively used to connect to the positive electrode and the negative electrode of the power supply, and by directly setting the first bracket 40 and the second bracket 40 to be conductive, all the first contact units 10 and all the second contact units 20 can be electrically connected without an additional conductive member. Furthermore, in order to prevent electric shock, insulating parts to prevent contact electric shock can also be set on the first bracket 40 and the second bracket 50 respectively.

[0065] As another embodiment, the first bracket 40 and the second bracket 50 are both made of insulating material. When insulating material is used, a conductive member can be used to make all the first contact units 10 and all the second contact units 20 electrically conductive. The specific implementation plan is shown below. Of course, the method of electrically connecting the first electrode and the second electrode with the power supply 230 is not limited to this.

[0066] As one of the Figure 5As shown, the first contact unit 10 and the second contact unit 20 respectively pass through the first bracket 40 and the second bracket 50 longitudinally, and the electric input module further includes at least one first conductive sheet 60 in the shape of a strip connected to the first contact electrode 210, and at least one second conductive sheet 70 in the shape of a strip connected to the second contact electrode 220. The first conductive sheet 60 and the second conductive sheet 70 are both arranged along the first direction, and the number of the first conductive sheets 60 is the same as the number of the first contact electrodes 210, and the number of the second conductive sheets 70 is the same as the number of the second contact electrodes 220; wherein the first conductive sheet 60 contacts all the first contact units 10 in the first contact electrode 210 corresponding to it, and the second conductive sheet 70 contacts all the second contact units 20 in the second contact electrode 220 corresponding to it, and the first conductive sheet 60 and the second conductive sheet 70 are respectively electrically connected to the positive electrode and the negative electrode of the power source 230. The first conductive sheet 60 and the second conductive sheet 70 in the shape of a strip can be used to easily electrically connect the first contact unit 10 and the second contact unit 20 to the positive electrode and the negative electrode of the power source 230, respectively, and the wiring circuit is simple and beautiful.

[0067] As another example, Figure 6 As shown, the first contact unit 10 and the second contact unit 20 respectively pass through the first bracket 40 and the second bracket 50 longitudinally, and the electric input module also includes at least one first conductive sheet 60 in the shape of a strip connected to the first contact electrode 210, and at least one second conductive sheet 70 in the shape of a strip connected to the second contact electrode 220. The first conductive sheet 60 and the second conductive sheet 70 are both arranged along the first direction, and the number of the first conductive sheets 60 is the same as the number of the first contact electrodes 210, and the number of the second conductive sheets 70 is the same as the number of the second contact electrodes 220; wherein, the first bracket A plurality of hollow openings 80 are provided at the middle position of each of the first and second brackets 40 and 50, and the hollow openings 80 are used to expose a portion of the first contact unit 10 and a portion of the second contact unit 20; and the first conductive sheet 60 contacts the portion of all the first contact units 10 in the first contact electrode 210 corresponding thereto exposed outside the hollow openings 80, and the second conductive sheet 70 contacts the portion of all the second contact units 20 in the second contact electrode 220 corresponding thereto exposed outside the hollow openings 80, and the first conductive sheet 60 and the second conductive sheet 70 are electrically connected to the positive and negative electrodes of the power supply, respectively. In order to facilitate the display of the hollow openings 80, Figure 6 The first conductive sheet 60 and the second conductive sheet 70 are not shown. The first contact unit 10 and the second contact unit 20 can be easily electrically connected to the positive electrode and the negative electrode of the power source 230 through the strip-shaped first conductive sheet 60 and the second conductive sheet 70, and the wiring circuit is simple and beautiful.

[0068] As another example, Figure 7As shown, the electrical input module also includes a longitudinal displacement mechanism 240 (for example, a motor or a cylinder), a horizontal position adjustment mechanism 250 connected to the longitudinal displacement mechanism 240 through a first frame 241, and the first contact electrode 210 and the second contact electrode 220 are connected to the horizontal position adjustment mechanism 250 through a second frame 251. The horizontal position adjustment mechanism 250 is used to drive the first electrode and the second electrode to move unidirectionally in the horizontal plane (for example, along the first direction or the second direction) or rotate in the horizontal plane at the same time. The longitudinal displacement mechanism 240 can make the first electrode and the second electrode move to 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 250 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 250 can be Figure 7 The structure shown may also be other conventional structures in the prior art.

[0069] For example, the horizontal position adjustment mechanism 250 of one embodiment includes three driving mechanisms 252 arranged in a right triangle, wherein the driving directions of the two driving mechanisms 252 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 252 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 can move simultaneously. In addition, in order to facilitate control, the horizontal position adjustment mechanism 250 is actually provided with a set of mechanical slide rails at the diagonal of the third driving mechanism 252, but there is no driver to provide driving force. Considering that the horizontal position adjustment mechanism 250 is a conventional structure in the prior art, it will not be described in detail here.

[0070] As another embodiment, a visual positioning mechanism, such as a commonly used CCD camera, is provided before the processing station to obtain the position of the back contact battery on the carrier 100, so that the horizontal position adjustment mechanism 250 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. As one embodiment, the visual positioning mechanism 400 is provided at the loading positioning station A. The visual positioning mechanism can be located above or below the carrier 100 according to the requirements.

[0071] 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; 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, the two processing stations can 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.

[0072] Specifically, for example Fig. 9 As shown, Fig. 9 (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, a plurality of first contact units 10 and a plurality of second contact units 20 are arranged along the first direction to form two first contact electrodes and two second contact electrodes, respectively. The straight line indicated by the arrow is the position in the first area of ​​the battery surface where the first contact electrode and the second contact electrode contact the back contact respectively (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 10 and the second contact unit 20 contact the Pad points arranged at intervals 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 contact electrodes, and other positions in the first area (the straight line where the Pad point is located) can be contacted. Fig. 9(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 arrows are the positions where the contact electrodes respectively contact the second area on the surface of the back contact battery. At this time, the scanning area of ​​the laser processing module 300 is the pattern filling area on both outer sides of the battery. In order to further achieve better processing effects, more than two contact electrodes can be used.

[0073] in, Fig. 9 The battery cell shown is a standard whole cell. As mentioned above, the battery placed on the carrier 100 may also be two or more slices after dicing. When the two slices are two slices, the two slices may be close together without a gap or separated by a certain gap. If the two slices are two slices 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 Fig. 9 ; When the two slices have been cut 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 Fig. 9 Divide into two and keep a certain distance between them.

[0074] It should be noted that, Fig. 9 (b) Relative Fig. 9 (a) Rotated 90°, it is assumed that the carrier device 100 is the turntable module described below, and the two processing stations are arranged adjacently. 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, the corresponding structures in the electric input module 200 are all rotated 90°. Of course, if the first processing station and the second processing station are arranged linearly (for example, the interactive module moving 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°.

[0075] As another example, Figure 8 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 achieve mass production, but also has a simple equipment structure and a simple implementation method. Among them, the rotary drive mechanism 120 can be, for example, a DD motor.

[0076] As another example, Figure 8 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; 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 is arranged above the carrier platform 110 corresponding to the loading and positioning station A. The visual positioning mechanism 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 250 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.

[0077] Furthermore, corresponding loading station A and unloading station D may also be provided with loading mechanism, loading and transporting mechanism, unloading mechanism, unloading and transporting mechanism, etc., which will not be elaborated here.

[0078] 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.

[0079] 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 a back contact battery, characterized in that: The invention comprises a carrying device for carrying a back-contact battery, the carrying device has a processing station, 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 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 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, and the plurality of first contact units are arranged into at least one first contact electrode arranged along a first direction; the second electrode includes a plurality of second contact units, and the plurality of second contact units are arranged into at least one second contact electrode arranged along the first direction; the first contact electrode and the second contact electrode are arranged side by side along a second direction, the second direction is perpendicular to the first direction, and the first contact unit and the second contact unit are staggered in the second direction.

2. The laser induced sintering device for back contact cells according to claim 1, characterized in that: The distance between two adjacent first contact units in one of the first contact electrodes is 2N times the distance between adjacent main grids or adjacent gate line Pad points on the back contact cell, where N is a natural number; the distance between two adjacent second contact units in one of the second contact electrodes is 2N times the distance between adjacent main grids or adjacent gate line Pad points on the back contact cell, where N is a natural number.

3. The laser induced sintering device for back contact cells according to claim 1, characterized in that: The number of the first contact electrodes is equal to or different from the number of the second contact electrodes.

4. The laser induced sintering device for back contact cells according to claim 1, characterized in that: The first contact unit and the second contact unit are both probes.

5. The laser induced sintering device for back contact cells according to claim 1, characterized in that: The first electrode and the second electrode are located above the carrying device, or the first electrode and the second electrode are located below a carrying surface of the carrying device that carries a back-contact battery.

6. The laser induced sintering device for back contact cells according to claim 1, characterized in that: A plurality of the first contact units are arranged into at least M first contact electrodes, and the at least M first contact electrodes are arranged along the second direction; a plurality of the second contact units are arranged into at least M second contact electrodes, and the at least M second contact electrodes are arranged along the second direction; At least M first contact electrodes and at least M second contact electrodes 220 form at least M electrical input units, and one electrical input unit includes one first contact electrode and one second contact electrode; wherein M is a natural number greater than or equal to 2.

7. The laser induced sintering device for back contact cells according to claim 6, characterized in that: The M is equal to the number of multiple slices of the standard battery cell carried by the carrying device.

8. The laser induced sintering device for back contact cells according to claim 6, characterized in that: The first contact unit of one of the two adjacent electrical input units corresponds to the gate line or Pad point at the odd column position, and the second contact unit corresponds to the gate line or Pad point at the even column position; and the first contact unit of the other of the two adjacent electrical input units corresponds to the gate line or Pad point at the even column position, and the second contact unit corresponds to the gate line or Pad point at the odd column position; Alternatively, the first contact units in all the electrical input units correspond to the gate lines or Pad points at odd-numbered column positions, and the second contact units correspond to the gate lines or Pad points at even-numbered column positions; Alternatively, the first contact units in all the electrical input units correspond to the gate lines or Pad points at even-numbered column positions, and the second contact units correspond to the gate lines or Pad points at odd-numbered column positions.

9. The laser induced sintering device for back contact cells according to claim 6, characterized in that: The M=2, that is, the electric input module includes at least two electric input units, and the at least two electric input units are symmetrically or asymmetrically arranged on both sides of the center line of the back contact battery surface.

10. The laser induced sintering device for back contact cells according to claim 1, characterized in that: The electric input module further comprises at least one strip-shaped support frame, the support frame is extended along the first direction, and the support frame is made of insulating material; The first contact electrode and the second contact electrode are fixed on the support frame, and one end of the first contact unit and one end of the second contact unit extend out of the support frame for electrical contact with the positive electrode and the negative electrode of the back contact battery.

11. The laser induced sintering device for back contact cells according to claim 10, characterized in that: At least one of the first contact electrodes and at least one of the second contact electrodes form at least one electrical input unit, and one of the electrical input units includes one of the first contact electrodes and one of the second contact electrodes. The number of the support frames is the same as the number of the electrical input units, and one of the support frames corresponds to one of the electrical input units.

12. The laser induced sintering device for back contact cells according to claim 1, characterized in that: The electric input module further includes at least one first bar-shaped bracket and at least one second bar-shaped bracket, the first bracket and the second bracket are both extended along the first direction, the number of the first brackets is the same as the number of the first contact electrodes, and the number of the second brackets is the same as the number of the second contact electrodes; Among them, one of the first contact electrodes is fixed on one of the first brackets, and one end of the first contact unit extends out of the first bracket for electrical contact with one of the positive electrode or the negative electrode of the back contact battery; one of the second contact electrodes is fixed on one of the second brackets, and one end of the second contact unit extends out of the second bracket for electrical contact with the other of the positive electrode or the negative electrode of the back contact battery.

13. The laser induced sintering device for back contact cells according to claim 12, characterized in that: The first bracket and the second bracket are both made of conductive material, and the first bracket and the second bracket are used to connect to the positive electrode and the negative electrode of the power supply respectively.

14. The laser induced sintering device for back contact cells according to claim 12, characterized in that: The first bracket and the second bracket are both made of insulating material.

15. The laser induced sintering device for back contact cells according to claim 14, characterized in that: The first contact unit and the second contact unit respectively pass through the first bracket and the second bracket longitudinally, the electrical input module further comprises at least one first conductive strip connected to the first contact electrode, and at least one second conductive strip connected to the second contact electrode, the first conductive strip and the second conductive strip are both arranged along the first direction, and the number of the first conductive strips is the same as the number of the first contact electrodes, and the number of the second conductive strips is the same as the number of the second contact electrodes; The first conductive sheet contacts all the first contact units in the corresponding first contact electrode, the second conductive sheet contacts all the second contact units in the corresponding second contact electrode, and the first conductive sheet and the second conductive sheet are electrically connected to the positive and negative electrodes of the power supply respectively.

16. The laser induced sintering device for back contact cells according to claim 14, characterized in that: The first contact unit and the second contact unit respectively pass through the first bracket and the second bracket longitudinally, the electrical input module further comprises at least one first conductive strip connected to the first contact electrode, and at least one second conductive strip connected to the second contact electrode, the first conductive strip and the second conductive strip are both arranged along the first direction, and the number of the first conductive strips is the same as the number of the first contact electrodes, and the number of the second conductive strips is the same as the number of the second contact electrodes; Among them, a plurality of hollow openings are provided at the middle positions of the first bracket and the second bracket, and the hollow openings are used to expose part of the first contact unit and part of the second contact unit; and the first conductive sheet contacts with the part of all the first contact units in the first contact electrodes corresponding to it exposed outside the hollow openings, and the second conductive sheet contacts with the part of all the second contact units in the second contact electrodes corresponding to it exposed outside the hollow openings, and the first conductive sheet and the second conductive sheet are electrically connected to the positive pole and the negative pole of the power supply respectively.

17. The laser induced sintering device for back contact cells according to claim 1, 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, the first contact electrode and the second contact electrode are connected to the horizontal position adjustment mechanism via a second frame, and the horizontal position adjustment mechanism is used to drive the first electrode and the second electrode to move unidirectionally in a horizontal plane or to rotate in a horizontal plane at the same time.

18. The laser induced sintering device for back contact cells according to claim 17, characterized in that: A visual positioning mechanism is arranged before the processing station to obtain 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.

19. The laser induced sintering device for back contact cells according to any one of claims 1 to 18, 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.

20. The laser induced sintering device for back contact cells according to any one of claims 1 to 18, 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.

21. The laser induced sintering device for back contact cells according to claim 20, 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.

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