Laser-induced sintering device for main-grid-free solar cell

Abstract

The main-grid-free solar cell laser-induced sintering device comprises a bearing platform, an electric input module and a laser module, the electric input module comprises a power source, a first electrode and a second electrode, the first electrode and the second electrode are used for being connected with the power source, and the first electrode and the second electrode can make contact with the upper surface and the lower surface of a cell respectively; the first electrode comprises a probe row and at least two parallel probe groups mounted on the probe row, each probe group comprises a plurality of probes, the plurality of probes of each probe group are arranged along the length direction of the probe row, the probes of the two adjacent probe groups are arranged in a staggered manner, and when the first electrode is pressed down to the upper surface of the battery piece, the probes of the two adjacent probe groups are separated from each other. The staggered probes can completely press the auxiliary grids on the upper surface of the battery piece, reverse bias voltage is applied to the battery piece through the first electrode and the second electrode, laser-induced sintering is carried out on the battery piece under laser irradiation, and an excellent metal-semiconductor contact structure is obtained.

Description

Technical Field

[0001] The present application belongs to the technical field of solar cell panels, and in particular, relates to a laser induced sintering device for a busbar-free solar cell panel. 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. Therefore, reducing the contact resistance has become an urgent need for major battery manufacturers. However, in pursuit of higher conversion efficiency, the square resistance of the emitter in the surface electrode of a crystalline silicon solar cell is getting higher and higher, making it difficult to form a lower contact resistance.

[0003] In order to reduce the contact resistance, laser induced sintering technology is used in the prior art. The laser excites the carriers of the battery cell and directs them to flow under the action of the reverse bias of the external electric field to form a loop. When the loop current flows through the metal-semiconductor interface, the contact resistance between the metal and the semiconductor is relatively large, which produces a more obvious thermal effect, thereby further promoting the mutual diffusion of the metal and the semiconductor, so as to obtain excellent contact characteristics after sintering.

[0004] During the laser induced sintering process, a probe row formed by a combination of multiple probes is often pressed on the main grid on the front of the cell to apply a reverse bias to the entire cell. However, for 0BB (no main grid) cells, there is no main grid on the front of the cell but only a secondary grid. It is necessary to use a probe row to press all the secondary grids on the front of the cell to apply a reverse bias to the entire cell. However, it is difficult for the existing probe row to press all the secondary grids on the front of the cell, resulting in poor laser induced sintering effects. Utility Model Content

[0005] In view of this, the present application provides a laser induced sintering device for a main grid-free solar cell, which can perform laser induced sintering when all the auxiliary grids on the upper surface of the cell are pressed down, thereby obtaining excellent metal-semiconductor contact characteristics.

[0006] A laser induced sintering device for a busbar-free solar cell comprises a carrying platform, an electric input module and a laser module;

[0007] The battery sheet is placed on the carrying platform;

[0008] The electric input module includes a power source and a first electrode and a second electrode for connecting to the power source, wherein the first electrode can contact the upper surface of the battery cell, and the second electrode can contact the lower surface of the battery cell;

[0009] The first electrode includes a probe row and at least two mutually parallel probe groups installed on the probe row, each probe group includes a plurality of probes, and the plurality of probes in each probe group are arranged along the length direction of the probe row, and the probes of two adjacent probe groups are arranged in a staggered manner, and when the first electrode is pressed down to the upper surface of the battery cell, the staggered probes can completely press the secondary grid on the upper surface of the battery cell;

[0010] When the first electrode and the second electrode are in contact with the upper surface and the lower surface of the battery cell respectively to apply a reverse bias, the laser module emits a laser beam to scan the battery cell.

[0011] Preferably, the probe row 221 comprises a conductive material, and along the length direction of the probe row, both ends of the probe row are provided with conductive wires, and the conductive wires provided at both ends of the probe row are electrically connected to the same polarity of the power supply.

[0012] Preferably, the probe group is provided with two groups, namely a first probe group and a second probe group;

[0013] The first probe group includes a plurality of first probes, each of which has a first contact portion that contacts the secondary grid on the upper surface of the battery cell;

[0014] The second probe group includes a plurality of second probes, each of which has a second contact portion in contact with a secondary grid on the upper surface of the battery cell;

[0015] The first probes and the second probes are arranged alternately with each other.

[0016] Preferably, each of the first contact portions and each of the second contact portions can press a secondary grid on the upper surface of the battery cell.

[0017] In another embodiment of the present application, each of the first contact portions and each of the second contact portions can press down at least two auxiliary grids on the upper surface of the battery cell.

[0018] Preferably, the distance between two adjacent first contact portions is smaller than the cross-sectional length of the second contact portion along the length direction of the probe row, and the distance between two adjacent second contact portions is smaller than the cross-sectional length of the first contact portion along the length direction of the probe row.

[0019] Preferably, the first contact portion and the second contact portion are both circular.

[0020] Preferably, the center distance between two adjacent first contact portions is less than twice the diameter of the first contact portion;

[0021] The center distance between two adjacent second contact portions is smaller than twice the diameter of the second contact portion.

[0022] Preferably, the wires arranged at both ends of the probe row are electrically connected to the first polarity of the power supply, and the second electrode is electrically connected to the second polarity of the power supply.

[0023] Preferably, the second electrode comprises a conductive portion disposed on the carrying platform and a conductive connector connected to the power source, the conductive connector can be electrically connected to the conductive portion, and the conductive portion contacts the lower surface of the battery cell.

[0024] Preferably, the conductive part is a conductive plate, the size of the conductive plate is greater than or equal to the size of the battery cell, and the conductive connector is in contact with a region of the conductive plate other than the battery cell.

[0025] Preferably, the carrying platform has a hollow portion, and the second electrode is arranged below the hollow portion;

[0026] The electric input module includes a driving mechanism, and the driving mechanism drives the second electrode to pass through the hollow portion and directly contact the lower surface of the battery cell.

[0027] Preferably, the second electrode includes at least one strip-shaped electrode, or at least one conductive column, or a conductive plate.

[0028] The beneficial effect of the present application is that when the first electrode is pressed down to the upper surface of the battery cell, the probes of two adjacent probe groups are arranged in an alternating manner, so that the sub-grid on the upper surface of the battery cell can be completely pressed down by the probes of multiple probe groups, and a reverse bias is applied to the battery cell through the first electrode and the second electrode, and the battery cell is laser-induced sintered under the irradiation of the laser to obtain an excellent metal-semiconductor contact structure. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

[0031] Figure 1 A schematic diagram of the structure of a busbar-free solar cell laser induced sintering device provided in this application;

[0032] Figure 2 The probe set provided for the present application is a stereoscopic view of two sets of first electrodes;

[0033] Figure 3 The probe group provided in the present application is a bottom view of the first electrode of two groups;

[0034] Figure 4 When there are three probe groups provided for this application, the positions of the probes of each group are arranged on the battery cell.

[0035] In the figure: 1-carrying platform; 2-electrical input module; 21-power supply; 22-first electrode; 221-probe row; 222-first probe; 2221-first contact portion; 223-second probe; 2231-second contact portion; 23-second electrode; 231-conductive portion; 232-conductive connector; 3-laser module; 4-battery cell; 5-wire. DETAILED DESCRIPTION

[0036] 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.

[0037] 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.

[0038] During the laser induced sintering of busbar-less solar cells, since there is only a sub-grid but no main grid on the upper surface of the cell, it is difficult to press down all the sub-grids on the upper surface of the cell when the existing probe row contacts the upper surface of the cell, resulting in poor laser induced sintering effect of busbar-less solar cells and limited improvement in the contact performance between metal and semiconductor.

[0039] To this end, the present application provides a busbar-free solar cell laser induced sintering device, referring to Figure 1-4 , including a carrying platform 1, an electric input module 2 and a laser module 3;

[0040] The battery sheet 4 is placed on the carrying platform 1;

[0041] The electric input module 2 includes a power source 21 and a first electrode 22 and a second electrode 23 for connecting to the power source 21. The first electrode 22 can contact the upper surface of the battery cell 4, and the second electrode 23 can contact the lower surface of the battery cell 4.

[0042] The first electrode 22 includes a probe row 221 and at least two probe groups parallel to each other installed on the probe row 221, each probe group includes a plurality of probes, and the plurality of probes in each probe group are arranged along the length direction of the probe row 221 ( Figure 3 The probes of two adjacent probe groups are arranged in a staggered manner. When the first electrode 22 is pressed down to the upper surface of the battery cell 4, the staggered probes can completely press the secondary grid on the upper surface of the battery cell 4.

[0043] When the first electrode 22 and the second electrode 23 are in contact with the upper surface and the lower surface of the battery cell 4 respectively to apply a reverse bias, the laser module 3 emits a laser beam to scan the battery cell 4 .

[0044] The present application contacts the upper surface of the battery cell 4 through the first electrode 22, contacts the lower surface of the battery cell 4 through the second electrode 23, and the first electrode 22 and the second electrode 23 are both connected to the power supply 21, thereby applying a reverse bias to the battery cell 4. It can be understood that the first electrode 22 and the second electrode 23 are electrically connected to different polarities of the power supply 21, respectively.

[0045] Specifically, the present application sets up multiple groups of parallel probe groups, and the probes of each probe group are designed to be arranged in an interlaced manner, so that all the sub-grids on the upper surface of the battery cell 4 can be pressed by the probes of each probe group, thereby applying a reverse bias to the battery cell 4. The laser induced sintering device of the present application can obtain excellent metal-semiconductor contact performance, and the performance of the obtained battery cell 4 is significantly improved.

[0046] The laser module 3 includes a laser and a laser scanning component (not shown in the figure). The laser is used to emit a laser beam, and the laser scanning component is used to control the scanning direction of the laser beam. The laser scanning component may include a galvanometer and a field lens, etc. Of course, other scanning methods can also be used as long as the scanning of the laser beam can be controlled.

[0047] In this embodiment, the probe groups may be two, three or four, or even more groups, as long as the present application can be implemented by staggering the probes of each probe group to press all the sub-grids on the upper surface of the battery cell 4.

[0048] When the probe set is provided with two groups, refer to Figure 2-3 The two probe groups are respectively a first probe group and a second probe group. The first probe group includes a plurality of first probes 222, each of which has a first contact portion 2221 that contacts the auxiliary grid on the upper surface of the battery cell 4. The second probe group includes a plurality of second probes 223, each of which has a second contact portion 2231 that contacts the auxiliary grid on the upper surface of the battery cell 4. The first probes 222 and the second probes 223 are arranged alternately with each other.

[0049] In one of the embodiments, each of the first contact portions 2221 and each of the second contact portions 2231 can press a secondary grid on the upper surface of the battery cell 4, that is, the first contact portion 2221 presses one of the secondary grids on the upper surface of the battery cell 4, and the second contact portion 2231 presses another adjacent secondary grid, so that all the secondary grids on the upper surface of the battery cell 4 are alternately pressed by the first contact portion 2221 and the second contact portion 2231.

[0050] In another embodiment, each of the first contact portions 2221 and each of the second contact portions 2231 can press down at least two auxiliary grids on the upper surface of the battery cell 4 .

[0051] Furthermore, the distance between two adjacent first contact portions 2221 is smaller than the distance between the second contact portions 2231 along the length direction of the probe row 221 ( Figure 3 The distance between two adjacent second contact portions 2231 is smaller than the cross-sectional length of the first contact portion 2221 along the length direction of the probe row 221, so that all the sub-grids on the upper surface of the battery cell 4 can be pressed by the first contact portion 2221 and the second contact portion 2231.

[0052] In order to further ensure that all the auxiliary grids on the upper surface of the battery cell 4 can be pressed by the first contact portion 2221 and the second contact portion 2231, and the first probe 222 and the second probe 223 can be arranged staggered with each other, as shown in FIG. Figure 3 As shown, the first contact portion 2221 and the second contact portion 2231 are both designed to be circular, and the sizes of the first contact portion 2221 and the second contact portion 2231 can be the same or different. The center distance between two adjacent first contact portions 2221 is less than twice the diameter of the first contact portion 2221, and the center distance between two adjacent second contact portions 2231 is less than twice the diameter of the second contact portion 2231.

[0053] Further, in the y direction, the distance between the center of the adjacent first contact portion 2221 and the center of the adjacent second contact portion 2231 is smaller than the diameter of the first contact portion 2221 or the second contact portion 2231 .

[0054] According to the above design, when the first probe 222 and the second probe 223 are staggered, the first contact portion 2221 and the second contact portion 2231 are staggered. Figure 3 The projections in the x direction in the figure partially overlap, so as to ensure that the secondary grids on the upper surface of the battery cell 4 can be pressed by the first contact portion 2221 and the second contact portion 2231 .

[0055] Of course, the first contact portion 2221 and the second contact portion 2231 can also be designed to be square, and the present application does not make any specific limitation on this, as long as the first contact portion 2221 and the second contact portion 2231 can press down all the auxiliary grids on the upper surface of the battery cell 4 when the first probe 222 and the second probe 223 are staggered with each other.

[0056] In another embodiment of the present application, there are three probe groups, and the three probe groups are arranged on the upper surface of the battery cell 4 as follows: Figure 4 As shown, each probe group includes a plurality of probes, and the projections of the probes of each probe group in the x-direction partially overlap, thereby ensuring that each sub-grid on the upper surface of the battery cell 4 is pressed by the probe. For example, the probes of the first probe group are named a11, a12, a13, ... from left to right, the probes of the second probe group are named a21, a22, a23, ... from left to right, and the probes of the third probe group are named a31, a32, a33, ... from left to right, wherein the projections of a11 and a21, a11 and a31, a12 and a22, a22 and a31, ... in the x-direction partially overlap.

[0057] The scheme of setting four or more probe groups will not be described in detail here. Their arrangement on the battery cell 4 can refer to the arrangement of two or three probe groups, as long as all the sub-grids on the front surface of the battery cell 4 can be pressed by the probes of each probe group.

[0058] like Figure 1 and Figure 2 As shown, along the length direction of the probe row 221 , both ends of the probe row 221 are provided with wires 5 , and the wires 5 provided at both ends of the probe row 221 are electrically connected to the same polarity of the power source 21 .

[0059] Both ends of the probe row 221 are electrically connected to the same polarity of the power source 21 through the wire 5, which can reduce the resistance and make the laser induced sintering effect better, thereby obtaining a more excellent metal-semiconductor contact structure.

[0060] It is understandable that the probe row 221 , the first probes 222 and the second probes 223 all contain conductive materials, so that the probe row 221 connected to the power source 21 through the wires 5 can simultaneously energize the plurality of first probes 222 and second probes 223 disposed on the probe row 221 .

[0061] Specifically, the wires 5 at both ends of the probe row 221 are electrically connected to the first polarity of the power source 21, and the second electrode 23 is electrically connected to the second polarity of the power source 21, thereby forming a loop, wherein the first electrode may be a negative electrode and the second electrode may be a positive electrode.

[0062] Continue to refer Figure 1 The second electrode 23 includes a conductive portion 231 disposed on the carrying platform 1 and a conductive connector 232 connected to the power source 21 , wherein the conductive connector 232 can be electrically connected to the conductive portion 231 , and the conductive portion 231 is in contact with the lower surface of the battery cell 4 .

[0063] Specifically, this embodiment also includes a driving mechanism (not shown in the figure), under the action of the driving mechanism, the conductive connector 232 is driven to move up and down. When it is necessary to apply a reverse bias to the battery cell 4, the driving mechanism drives the conductive connector 232 to move downward until it contacts the conductive portion 231. In this process, the first electrode 22 can be pressed down to the upper surface of the battery cell 4 under the action of the same driving mechanism, that is, under the action of the driving mechanism, the conductive connector 232 contacts the conductive portion 231, and the first contact portion 2221 and the second contact portion 2231 of the first electrode 22 contact the auxiliary grid on the upper surface of the battery cell 4. The specific structure of the driving mechanism is the prior art, such as a Z-axis driving module, or other driving mechanisms that can achieve the purpose of this embodiment, which will not be described in detail here. Of course, the first electrode 22 and the conductive connector 232 can also be independently driven by separate driving mechanisms. The conductive connector 232 may also be electrically connected to the conductive portion 231 at all times. When a reverse bias needs to be applied to the battery cell 4, the first electrode 22 is pressed down to the upper surface of the battery cell 4 under the action of the driving mechanism, so that the first contact portion 2221 and the second contact portion 2231 are in contact with the auxiliary grid on the upper surface of the battery cell 4.

[0064] In this embodiment, the conductive part 231 can be arranged on the carrying platform 1 in various forms, such as at least part of the surface of the carrying platform 1 being used as the conductive part 231. Specifically, the entire carrying platform 1 can be made of a conductive material, and the battery cell 4 can be directly placed on the conductive carrying platform 1, or only the part of the carrying platform 1 surface in contact with the battery cell 4 can be made of a conductive material. In this embodiment, it is preferred that the part of the carrying platform 1 surface in contact with the battery cell 4 is made of a conductive material, so that the lower surface of the battery cell 4 is in contact with this part of the surface of the carrying platform 1.

[0065] It can also be Figure 1 The conductive part 231 shown is a conductive plate, which is placed on the supporting platform 1. The size of the conductive plate is greater than or equal to the size of the battery cell 4. The battery cell 4 is placed on the conductive plate so that the lower surface of the battery cell 4 contacts the conductive plate, and the conductive connector 232 contacts the area on the conductive plate other than the battery cell 4.

[0066] The conductive connector 232 includes at least one conductive column, that is, in order to achieve electrical connection, the conductive connector 232 only needs to have at least one contact point connected to the conductive portion 231. Preferably, there are four conductive columns, which are separately arranged on both sides of the battery cell 4.

[0067] Furthermore, the material of the conductive portion 231 is preferably copper, which has good conductivity and is relatively cheap.

[0068] In another embodiment of the present application, the supporting platform 1 has a hollow portion (not shown in the figure), and the second electrode 23 is arranged below the hollow portion. Under the action of the driving mechanism, the second electrode 23 can pass through the hollow portion and directly contact the lower surface of the battery cell 4. More specifically, the second electrode 23 can be an electrode including at least one strip, or can be an electrode including at least one conductive column, or can be a conductive plate, as long as the lower surface of the battery cell 4 can be electrically connected to the power source 21.

[0069] 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.

[0070] It should be noted that in the description of the present application, it should be understood that the terms "upper", "lower", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. When a component is considered to be "connected" to another component, it may be directly connected to the other component or there may be a centrally arranged component at the same time.

[0071] It should also be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprises", "comprising" or any other variants thereof are intended to cover non-exclusive inclusion, so that an article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such article or device. In the absence of further restrictions, the elements defined by the sentence "comprising a ..." do not exclude the existence of other identical elements in the article or device including the above elements.

[0072] 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 busbar-free solar cell, characterized in that: It comprises a carrying platform (1), an electric input module (2) and a laser module (3); A battery cell (4) is placed on the carrying platform (1); The electric input module (2) comprises a power source (21) and a first electrode (22) and a second electrode (23) for connecting to the power source (21), wherein the first electrode (22) can contact the upper surface of the battery cell (4), and the second electrode (23) can contact the lower surface of the battery cell (4); The first electrode (22) comprises a probe row (221) and at least two mutually parallel probe groups mounted on the probe row (221), each probe group comprising a plurality of probes, the plurality of probes in each probe group being arranged along the length direction of the probe row (221), and the probes of two adjacent probe groups being arranged in a staggered manner, and when the first electrode (22) is pressed down onto the upper surface of the battery cell (4), the staggeredly arranged probes can completely press down the secondary grid on the upper surface of the battery cell (4); When the first electrode (22) and the second electrode (23) are in contact with the upper surface and the lower surface of the battery cell (4) respectively to apply a reverse bias voltage, the laser module (3) emits a laser beam to scan the battery cell (4).

2. The laser induced sintering device for busbar-free solar cell according to claim 1, characterized in that: The probe row (221) comprises a conductive material, and along the length direction of the probe row (221), both ends of the probe row (221) are provided with conductive wires (5), and the conductive wires (5) provided at both ends of the probe row (221) are electrically connected to the same polarity of the power source (21).

3. The laser induced sintering device for busbar-free solar cell according to claim 1, characterized in that: The probe group is provided with two groups, namely a first probe group and a second probe group; The first probe group comprises a plurality of first probes (222), wherein the first probes (222) have a first contact portion (2221) contacting a secondary grid on the upper surface of the battery cell (4); The second probe group comprises a plurality of second probes (223), wherein the second probes (223) have second contact portions (2231) contacting the secondary grid on the upper surface of the battery cell (4); The first probes (222) and the second probes (223) are arranged alternately with each other.

4. The laser induced sintering device for busbar-free solar cell according to claim 3, characterized in that: Each of the first contact portions (2221) and each of the second contact portions (2231) can press a secondary grid on the upper surface of the battery cell (4).

5. The laser induced sintering device for busbar-free solar cell according to claim 3, characterized in that: Each of the first contact portions (2221) and each of the second contact portions (2231) can press down at least two auxiliary grids on the upper surface of the battery cell (4).

6. The laser induced sintering device for busbar-free solar cell according to claim 5, characterized in that: The distance between two adjacent first contact portions (2221) is smaller than the cross-sectional length of the second contact portion (2231) along the length direction of the probe row (221), and the distance between two adjacent second contact portions (2231) is smaller than the cross-sectional length of the first contact portion (2221) along the length direction of the probe row (221).

7. The laser induced sintering device for busbar-free solar cell according to claim 6, characterized in that: The first contact portion (2221) and the second contact portion (2231) are both circular.

8. The laser induced sintering device for busbar-free solar cell according to claim 7, characterized in that: The center distance between two adjacent first contact portions (2221) is less than twice the diameter of the first contact portion (2221); The center distance between two adjacent second contact portions (2231) is less than twice the diameter of the second contact portion (2231).

9. The laser induced sintering device for busbar-free solar cell according to claim 2, characterized in that: The wires (5) arranged at both ends of the probe row (221) are electrically connected to the first polarity of the power source (21), and the second electrode (23) is electrically connected to the second polarity of the power source (21).

10. A busbar-less solar cell laser induced sintering device according to any one of claims 1 to 9, characterized in that: The second electrode (23) comprises a conductive portion (231) arranged on the supporting platform (1) and a conductive connecting member (232) connected to the power source (21); the conductive connecting member (232) can be electrically connected to the conductive portion (231); and the conductive portion (231) is in contact with the lower surface of the battery cell (4).

11. The laser induced sintering device for busbar-free solar cell according to claim 10, characterized in that: The conductive part (231) is a conductive plate, the size of the conductive plate is greater than or equal to the size of the battery cell (4), and the conductive connecting member (232) is in contact with an area on the conductive plate other than the battery cell (4).

12. A busbar-less solar cell laser induced sintering device according to any one of claims 1 to 9, characterized in that: The carrying platform (1) has a hollow portion, and the second electrode (23) is arranged below the hollow portion; The electric input module (2) comprises a driving mechanism, and the driving mechanism drives the second electrode (23) to pass through the hollow portion and directly contact the lower surface of the battery cell (4).

13. The laser induced sintering device for busbar-free solar cell according to claim 12, characterized in that: The second electrode (23) includes at least one strip electrode, or at least one conductive column, or a conductive plate.

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