Laser-induced sintering equipment of solar cell

Abstract

The laser-induced sintering equipment comprises at least one machining station, the equipment comprises a bearing device, a laser machining module and a conductive module, the laser machining module and the conductive module are arranged on the machining station, the bearing device comprises at least one bearing table, and a first conductive plate and a second conductive plate are separately arranged on the surface of the bearing table in the first direction; a space between the first current-conducting plate and the second current-conducting plate is an electric partition area, and the surfaces of the first current-conducting plate, the second current-conducting plate and the electric partition area jointly form a battery piece bearing area; the conductive module comprises a first electrode and a conductive piece which are separately arranged in the first direction, the first electrode is used for being in contact with a battery piece borne in the battery piece bearing area corresponding to the surface of one conductive plate or in contact with a battery piece borne in the battery piece bearing area corresponding to the surface of the electric partition area, and the conductive piece is used for being in contact with the other conductive plate. The equipment can solve the problem that the surface of the bearing table is sparking and bulged, the table top is prevented from being damaged, and the battery piece is also prevented from being broken.

Description

Technical Field

[0001] The present application belongs to the field of photovoltaics, and specifically, relates to a laser induced sintering device for solar cells. Background Art

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

[0003] The applicant's research found that when using laser induced sintering technology, there may be discharge at the electrode tip when a reverse voltage is applied to the battery cell and the initial moment of laser scanning, causing sparks on the surface of the carrier to form protrusions or directly cause battery cell fragments. The protrusions formed by sparks on the surface of the carrier may also cause the problem of battery cell fragments. Utility Model Content

[0004] In view of this, the present application provides a laser induced sintering device for solar cells, comprising at least one processing station, the laser induced sintering device for solar cells comprising a carrying device and a laser processing module and a conductive module arranged at the processing station, the carrying device comprising at least one carrying platform, the laser processing module and the conductive module are located above the carrying platform,

[0005] The surface of the carrier platform is provided with a first conductive plate and a second conductive plate separately along a first direction, the upper surfaces of the first conductive plate and the second conductive plate are at the same height, the space between the first conductive plate and the second conductive plate is called an electrical isolation area, and the first conductive plate, the second conductive plate and the surface of the electrical isolation area together constitute a battery cell carrier area;

[0006] The conductive module includes a first electrode and a conductive member separately arranged along a first direction, the first electrode is used to contact the battery cells carried in the battery cell carrying area corresponding to the surface of one of the conductive plates or the battery cells carried in the battery cell carrying area corresponding to the surface of the electrical isolation area, and the conductive member is used to contact the other conductive plate.

[0007] Furthermore, the first conductive plate and the second conductive plate are rectangular and are arranged in parallel.

[0008] Furthermore, the first conductive plate and the second conductive plate are of the same or different sizes. When the first conductive plate and the second conductive plate are of the same size, the first conductive plate and the second conductive plate are symmetrically arranged relative to the central axis of the supporting platform along the second direction, and the second direction is perpendicular to the first direction.

[0009] Furthermore, the width of the electrical isolation region in the first direction is 5 mm to 190 mm, or the width of the electrical isolation region in the first direction is smaller than the length of the gate line region on the battery cell.

[0010] Furthermore, the laser processing module includes a laser for emitting a laser beam and a laser scanning mechanism for controlling the laser beam, and the laser scanning mechanism controls the laser beam to scan an area on the battery cell other than the first electrode contact position.

[0011] Furthermore, the width of the battery cell supporting area is smaller than the outer contour width of the first conductive plate and the second conductive plate, and the conductive member is used to contact the non-battery cell supporting area of ​​the surface of the two conductive plates that contacts the conductive member.

[0012] Furthermore, it also includes a lifting drive mechanism connected to the conductive module. When the supporting platform is located at the processing station, and if the conductive plate used to contact the conductive part at this time is the first conductive plate, the projection of the conductive part on the horizontal plane is located in the area outside the battery cell supporting area, and the projection of the first electrode on the horizontal plane is located in the battery cell supporting area corresponding to the surface of the second conductive plate or in the battery cell supporting area corresponding to the surface of the electrical isolation area. The lifting drive mechanism drives the conductive part to lift and lower so that the conductive part contacts or moves away from the first conductive plate, and drives the first electrode to lift and lower so that the first electrode contacts or moves away from the battery cell.

[0013] Furthermore, the first electrode is at least one strip electrode extending along a second direction, and the second direction is perpendicular to the first direction.

[0014] Furthermore, the conductive member is at least one conductive column or a strip electrode extending along a second direction, the number of the strip electrode is at least one, and the second direction is perpendicular to the first direction.

[0015] Furthermore, a partition insulating strip is provided in the electrical isolation area, and the upper surface of the partition insulating strip is located at the same horizontal plane as the upper surfaces of the first conductive plate and the second conductive plate.

[0016] Furthermore, the support platform is a negative pressure adsorption support platform, that is, an adsorption chamber is provided inside the support platform, a plurality of first adsorption channels are provided on the surface of the support platform, the first adsorption channels are connected to the adsorption chamber, the adsorption chamber is used to connect to a vacuum generating device, a plurality of second adsorption channels are provided on the surfaces of the first conductive plate and the second conductive plate, the second adsorption channels are connected to the first adsorption channels.

[0017] Furthermore, the carrier platform is divided into a first carrier platform and a second carrier platform, the first conductive plate is arranged on the surface of the first carrier platform, and the second conductive plate is arranged on the surface of the second carrier platform.

[0018] Furthermore, the carrying device includes a plurality of the carrying platforms, and the carrying device also includes a rotating drive mechanism connected to the plurality of the carrying platforms, the plurality of the carrying platforms are circumferentially connected to the rotating drive mechanism, and the rotating drive mechanism is used to drive the plurality of carrying platforms to rotate and move to the processing station.

[0019] Furthermore, the number of the supporting platforms is four, the number of the processing stations is two and the two processing stations are arranged adjacent to each other, the two processing stations are both provided with the conductive module, and the positions of the battery cells corresponding to the first electrodes of the two processing stations contacting the corresponding processing stations are offset.

[0020] The present application sets the first conductive plate and the second conductive plate separately along the first direction, and sets the first electrode and the conductive member separately along the first direction, thereby isolating the current of the conductive plate (also called a conductive carrier) that contacts the electrode on the back of the battery cell, thereby changing the current path. When the current is transmitted to the conductive plate that contacts the conductive member, the current no longer passes through the conductive plate that does not contact the conductive member, thereby solving the problem of sparking protrusions on the surface of the carrier, avoiding damage to the table surface, and also preventing the battery cell from breaking. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] 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.

[0022] 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.

[0023] Figure 1 A schematic structural diagram of a laser induced sintering device for a solar cell according to an embodiment of the present application.

[0024] Figure 2 A schematic diagram of the structure of a support platform according to an embodiment of the present application. DETAILED DESCRIPTION

[0025] 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.

[0026] 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.

[0027] like Figure 1 As shown, the present application provides a laser induced sintering device for solar cells, comprising at least one processing station, the laser induced sintering device for solar cells comprises a carrying device and a laser processing module ( Figure 1The laser processing module and the conductive module are located above the carrier 1. Generally, the laser processing module is located above the conductive module. The processing station refers to a spatial position, which is the position where the battery cell is subjected to laser induced sintering processing. Therefore, the laser processing module and the conductive module are correspondingly arranged at this position. The laser processing module includes a laser for emitting a laser beam and a laser scanning mechanism for controlling the scanning direction of the laser beam. The laser scanning mechanism can be in the form of a galvanometer and a field lens. Of course, the laser processing module can also include optical devices arranged according to some requirements. The laser processing module is used to control the laser beam to scan the battery cell to achieve laser induced sintering processing when a reverse voltage is applied to the battery cell through the conductive module and the conductive plate arranged on the surface of the carrier 1 described below. Among them, the supporting platform 1 can be movable or fixed. When the supporting platform 1 is movable, the supporting platform 1 is driven to move to the processing station for laser induced sintering processing. The supporting device of this structure is shown in the turntable module below; when the supporting platform 1 is fixed, the supporting platform 1 is located at the processing station.

[0028] The surface of the support platform 1 is provided with a first conductive plate 2 and a second conductive plate 3 separately along a first direction. The two conductive plates are provided separately so that when the conductive module is connected to an external power supply, the current cannot be conducted from the conductive plate in contact with the conductive member 6 through the electrical isolation area 4 to the other conductive plate to make the circuit conductive. Figure 1 In the X-axis direction, the upper surfaces of the first conductive plate 2 and the second conductive plate 3 are at the same height (that is, the upper surfaces of the two must be located at the same horizontal plane, and there is no height difference between the upper surfaces of the two) so as to smoothly carry the battery cell to reduce the fragmentation rate, and at the same time improve the fit between the battery cell and the two conductive plates. The higher the fit, the smaller the possibility of ignition. Of course, the same height mentioned here is not limited to being exactly the same, and it is within the acceptable range of smoothly carrying the battery cell and does not cause the battery cell to break. The space between the first conductive plate 2 and the second conductive plate 3 is called the electrical isolation area 4. The first conductive plate 2, the second conductive plate 3 and the surface of the electrical isolation area 4 together constitute the battery cell carrying area. The battery cell carrying area is used to place the battery cell, that is, the first conductive plate 2 and the second conductive plate 3 are used to jointly carry the battery cell, and at the same time, the two conductive plates are in contact with the electrodes on the back of the battery cell when carrying the battery cell. The carried battery cell can be a complete standard battery cell or a plurality of split slices, the number of which is at least two. Taking two split slices as an example, two two split slices are placed in the battery cell carrying area along a direction perpendicular to the first direction.

[0029] When there are more than one supporting platforms 1 , a first conductive plate 2 and a second conductive plate 3 are disposed on the surface of each supporting platform 1 .

[0030] The conductive module includes a first electrode 5 and a conductive member 6 which are separately arranged along a first direction. The first electrode 5 and the conductive member 6 are used to connect with the positive and negative electrodes of an external power source. The first electrode 5 is also used to contact with a battery cell carried in a battery cell carrying area corresponding to the surface of one of the conductive plates or to contact with a battery cell carried in a battery cell carrying area corresponding to the surface of the electrical isolation area 4 so that the first electrode 5 is electrically connected to the electrode on the upper surface of the battery cell. The conductive member 6 is used to contact with another conductive plate so that the other conductive plate is electrically connected to the electrode on the lower surface of the battery cell. In order to make the first electrode 5 form a good contact with the electrode on the upper surface of the battery cell, the first electrode 5 is mainly pressed on the main grid position of the battery cell, and the main grid is extended along the second direction, and the second direction is perpendicular to the first direction, that is, Figure 1 The Y-axis direction is shown, that is, the first electrode 5 is parallel to the Y-axis. However, there is no need for precise alignment between the position of the electrical isolation region 4 and the electrode pattern on the cell. An example of the relationship between the electrical isolation region 4 and the main grid position is as follows: Figure 1 shown.

[0031] It should be noted that the laser induced sintering equipment of the solar cell is suitable for cells with electrodes on both sides, such as Topcon cells, whose positive and negative electrodes are respectively located on the upper and lower surfaces of the cell. In order to facilitate the application of reverse voltage to the cell, the first electrode 5 contacts the electrode on the upper surface of the cell, and the conductive plate in contact with the conductive member 6 contacts the electrode on the lower surface of the cell. Furthermore, in order to achieve electrical connectivity during processing, the first electrode 5 and the conductive plate of the two conductive plates in contact with the conductive member 6 are respectively connected to the positive and negative electrodes of the external power supply. Of course, the first electrode 5 here does not necessarily mean that it is connected to the positive electrode of the external power supply, and it is also possible to connect to the negative electrode of the external power supply, which depends on whether the polarity of the electrode on the upper surface of the cell is positive or negative. This part of the content is prior art and will not be repeated here.

[0032] It should also be noted that when performing laser induced sintering processing, the laser beam is scanned one by one to complete the laser scanning processing of the required entire width. In the process of processing, in order to solve the problem of the first electrode 5 blocking the laser scanning, the processing is divided into two times. In one processing, the area scanned by the laser can be called the laser scanning processing area, and the area not scanned by the laser can be called the non-laser scanning processing area. Further, in order to solve the problem of the first electrode 5 blocking the laser beam scanning, the applicant currently adopts one of the technical solutions to set up two processing stations, and the two processing stations are respectively provided with conductive modules. When processing at the first processing station, the first electrode 5 contacts the first area on the upper surface of the battery cell, and the laser scans the area outside the first area of ​​the battery cell; when processing at the second processing station, the position of the first electrode 5 changes, contacts the second area on the upper surface of the battery cell, and the laser scans the area outside the second area of ​​the battery cell. The first area is different from the second area, and the width of the two laser scans is the entire width required to scan the battery cell. Therefore, the width of the laser scanning processing of the carrier 1 at one processing station may not be the entire width. Of course, in order to solve the shading problem of the first electrode 5, other solutions may also be adopted, such as only one processing station, by changing the position of the battery cell relative to the first electrode 5 and then dividing the process into two steps, and at the end of the first step, the laser scanning processing area is not the entire area. Therefore, in order to solve the shading problem, a laser scanning processing area and a non-laser scanning processing area may appear after one laser scanning.

[0033] Assuming that the first conductive plate 2 is a conductive plate in contact with the conductive member 6, during the first laser scan, the first electrode 5 contacts the main grid in the right area of ​​the upper surface of the cell (in the X-axis direction), and the laser beam scans the left area of ​​the cell. At this time, the first conductive plate 2 contacts the back of the left area of ​​the cell, and the second conductive plate 3 contacts the back of the right area of ​​the cell. During operation, the conductive member 6 and the first electrode 5 are connected to an external power supply. When a reverse voltage is applied to the cell and the laser beam is used to scan the cell, the current starts from the position where the laser beam scans the upper surface (left area) of the cell, passes through the cell to the electrode on the lower surface of the cell, and then conducts to the first conductive plate 2, then conducts to the conductive member 6, and then conducts to the first electrode 5 through the external power supply, and then conducts to the electrode on the upper surface of the cell, that is, conducts to the non-laser scanning processing area of ​​the cell, and finally conducts along the upper surface electrode of the cell to the laser scanning processing area, forming a complete circuit. In this process, the current will not be conducted from the first conductive plate 2 to the second conductive plate 3, and the current in the left area of ​​the back of the cell (that is, the area where the back of the cell contacts the first conductive plate 2) will not be conducted to the right area of ​​the back of the cell (the area where the back of the cell contacts the second conductive plate 3), thereby solving the problem of sparking bulges on the surface of the electrode tip discharge support platform. During the second laser scanning, the first electrode 5 contacts the main grid in the left area of ​​the upper surface of the cell, and the laser beam scans the right area of ​​the cell. At this time, the direction of the current flow can be inferred based on the above process, which will not be described in detail here. Thus, through two laser processing, the scanning of the area to be processed is completed.

[0034] The laser induced sintering equipment for solar cells proposed in the above-mentioned embodiment of the present application, by separately arranging the first conductive plate 2 and the second conductive plate 3 (the prior art generally adopts a complete conductive plate), thereby isolating the current of the conductive plate (also called a conductive carrier) that contacts the back electrode of the battery cell, thereby changing the current path. When the current is transmitted to the conductive plate that contacts the conductive member 6, the current no longer passes through the conductive plate that does not contact the conductive member 6, thereby solving the problem of sparking protrusions on the surface of the carrier, avoiding damage to the table surface, and also avoiding breakage of the battery cell.

[0035] Preferably, if Figure 2 As shown, the first conductive plate 2 and the second conductive plate 3 are rectangular and arranged in parallel, which simplifies the structure and facilitates the two conductive plates to better carry the battery cells. Of course, the shape and size of the first conductive plate 2 and the second conductive plate 3 in the present application are not limited to this, and the key point is that they are arranged separately without physical contact.

[0036] Furthermore, the first conductive plate 2 and the second conductive plate 3 are of the same or different sizes. When the first conductive plate 2 and the second conductive plate 3 are of the same size, that is, the width of the battery cells carried by the two conductive plates is also the same, the first conductive plate 2 and the second conductive plate 3 are symmetrically arranged relative to the central axis of the supporting platform 1 along the second direction, and the second direction is perpendicular to the first direction. For example, Figure 1 The Y-axis direction.

[0037] Furthermore, the width of the electrical isolation area 4 in the first direction is 5 mm to 190 mm, or the width of the electrical isolation area 4 in the first direction is smaller than the length of the gate line area on the battery cell, so as to ensure the formation of a complete current loop.

[0038] Furthermore, the laser processing module includes a laser for emitting a laser beam and a laser scanning mechanism for controlling the laser beam, and the laser scanning mechanism controls the laser beam to scan the area on the cell other than the contact position of the first electrode 5. As mentioned above, in order to solve the shading problem, the laser scanning is completed in two scans, and the two scans can be performed at one processing station or at two processing stations. However, no matter which scheme is used, each time the laser beam scans the area on the cell that is not contacted by the first electrode 5. Specifically, when the first conductive plate 2 and the second conductive plate 3 are exactly the same in size, the width of the battery cell carried by the two is also the same. Preferably, the width of each laser scan is half of the entire width of the battery cell, and they are respectively the left half area and the right half area according to the first direction. For example: during the first processing, the first electrode 5 first contacts the left half area, and the laser scans the right half area. At this time, in the first processing, the right half area is called the laser scanning processing area, and the left half area is called the non-laser scanning processing area; during the second processing, the first electrode 5 contacts the right half area, and the laser scans the left half area. At this time, in the second processing, the left half area is called the laser scanning processing area, and the right half area is called the non-laser scanning processing area. Among them, the shape of the first electrode 5 is related to the shape of the electrode on the contact battery cell, and the gate line electrode on the battery cell is strip-shaped. When the first electrode 5 is, for example, a strip-shaped probe row, it can be one row, contacting one main gate line, and of course it can also be multiple rows, but it cannot be too much to block the laser.

[0039] Furthermore, the width of the cell support area is smaller than the outer contour width of the first conductive plate 2 and the second conductive plate 3, and the conductive member 6 is used to contact the non-cell support area of ​​the surface of the conductive plate that contacts the conductive member 6 of the two conductive plates, for example Figure 1 As shown, the conductive plate in contact with the conductive member 6 is the first conductive plate 2, and the conductive member 6 is used to contact the non-cell bearing area on the surface of the first conductive plate 2, that is, the conductive member 6 will not contact the cell. This arrangement can design a simple conductive member 6, which can be directly raised and lowered to contact or stay away from the conductive plate, and the operation design is more convenient.

[0040] Furthermore, it also includes a lifting drive mechanism 7 connected to the conductive module. When the support platform 1 is located at the processing station, and if the conductive plate used to contact the conductive member 6 at this time is the first conductive plate 2, the projection of the conductive member 6 on the horizontal plane is located in the area outside the battery cell supporting area, and the projection of the first electrode 5 on the horizontal plane is located in the battery cell supporting area corresponding to the surface of the second conductive plate 3 or in the battery cell supporting area corresponding to the surface of the electrical isolation area 4. The lifting drive mechanism 7 drives the conductive member 6 to rise and fall so that the conductive member 6 contacts or moves away from the first conductive plate 2 and drives the first electrode 5 to rise and fall so that the first electrode 5 contacts or moves away from the battery cell. Among them, the lifting drive mechanism 7 can include only one driving actuator, and one driving actuator drives the first electrode 5 to rise and fall together with the conductive plate, or it can include two driving actuators, which respectively drive the first electrode 5 and the conductive member 6 to rise and fall. The driving actuator can be a motor or a cylinder, etc. The lifting drive mechanism 7 can also include other necessary support frames and other structures to facilitate the driving actuator to drive the first electrode 5 and the conductive member 6.

[0041] Furthermore, if Figure 1 As shown, the first electrode 5 is at least one strip electrode extending along the second direction, and the number of strip electrodes is at least one. The second direction is perpendicular to the first direction. The reason why it is strip-shaped is that the grid lines on the battery cell are slender strips. At this time, the strip electrode can be any one of a probe row, a conductive wire, a conductive plate with a pattern, or a conductive strip (at this time, it can be in surface contact with the battery cell). Specifically, the probe row structure refers to a plurality of probes connected in a line on a probe bracket, and the electrodes on the upper surface of the battery cell are contacted through the plurality of probes. Preferably, the probe is elastic, and the form of the elastic probe can be that the probe is hollow and a spring is arranged inside, or the probe is solid and the probe itself is elastic. The probe is set to be elastic to avoid damaging the battery cell. A patterned conductive plate refers to a conductive plate containing a pattern that contacts the battery cell electrode. Preferably, the number of strip electrodes is one, and the process processing effect is good, and the cost is saved while reducing the fragmentation rate. The number of strip electrodes is small to avoid affecting the solution to the electrode shading problem.

[0042] Further, the conductive member 6 is at least one conductive column or a strip electrode extending along the second direction, and the second direction is perpendicular to the first direction, wherein the conductive member 6 is at least one conductive column, which means that in order to achieve electrical connection, the conductive member 6 only needs to have one contact point in contact with the conductive plate. Preferably, the conductive member 6 is a strip electrode, and the number is only one, which is convenient for operation and maintenance.

[0043] Furthermore, a partition insulating strip is provided in the electrical isolation area 4, and the upper surface of the partition insulating strip is located at the same horizontal plane as the upper surfaces of the first conductive plate 2 and the second conductive plate 3, so that the battery cell is better supported when the first electrode 5 contacts the upper surface of the battery cell, and the battery cell is prevented from being fragile when the first electrode 5 descends to contact the battery cell, especially when the first electrode 5 contacts the battery cell supported in the battery cell supporting area corresponding to the surface of the electrical isolation area 4. Preferably, the partition insulating strip fills the electrical isolation area 4.

[0044] Furthermore, the support platform 1 is a negative pressure adsorption support platform 1, that is, an adsorption chamber is arranged inside the support platform 1, a plurality of first adsorption channels are arranged on the surface of the support platform 1, the first adsorption channel is connected with the adsorption chamber, the adsorption chamber is used to connect with the vacuum generating device, a plurality of second adsorption channels are arranged on the surface of the first conductive plate 2 and the second conductive plate 3, the second adsorption channel is connected with the first adsorption channel, thereby fixing the battery cell on the two conductive plates through the first adsorption channel and the second adsorption channel to prevent the position of the battery cell from shifting.

[0045] Furthermore, the support platform 1 is divided into a first support platform and a second support platform, the first conductive plate 2 is arranged on the surface of the first support platform, and the second conductive plate 3 is arranged on the surface of the second support platform. That is to say, the support platform 1 can be a complete whole or two separate structures, which can be set according to actual needs.

[0046] Further, the bearing device is a turntable module, including a plurality of bearing platforms 1, wherein each bearing platform 1 is provided with the first conductive plate 2 and the second conductive plate 3 of the above-mentioned embodiment. The bearing device also includes a rotary drive mechanism connected to the plurality of bearing platforms 1, and the rotary drive mechanism is used to drive the plurality of bearing platforms 1 to move to the processing station. The bearing device of this structure is convenient for mass production. In addition, in order to facilitate the support of the plurality of bearing platforms 1, the bearing device may also include a support frame connected to the output shaft of the rotary drive mechanism, and the plurality of bearing platforms 1 are connected to the support frame so as to be connected to the rotary drive mechanism. The driving actuator in the rotary drive mechanism is, for example, a DD motor, and the output shaft of the driving actuator of the rotary drive mechanism is vertically connected to the center point of the support frame, and the support frame is horizontally symmetrically arranged, and the plurality of bearing platforms 1 are at an equal distance from the center point of the support frame, so as to better drive the movement of the plurality of bearing platforms 1. Of course, the laser induced sintering equipment of solar cells may also include other stations according to demand, such as a loading station and a unloading station, and the rotary drive mechanism drives the plurality of bearing platforms 1 to pass through the loading station, the processing station, and the unloading station in sequence.

[0047] Furthermore, the number of the carriers 1 is four, the number of the processing stations is two and the two processing stations are arranged adjacent to each other, and the two processing stations are both provided with a conductive module, that is, the two processing stations both include a first electrode 5 and a conductive member 6. As for the laser processing module, it may include two lasers and two laser scanning mechanisms corresponding to the two processing stations respectively, or it may include a laser and a spectrometer, and two laser scanning mechanisms, and the spectrometer is scanned by two laser scanning mechanisms after the spectrometer splits the light, as long as the laser processing module can realize laser scanning of the two processing stations. Considering that there are four carriers 1, in order to enable each carrier 1 to move to a processing station, the rotary drive mechanism drives each carrier 1 to rotate 90° at a time. In order to solve the problem of the first electrode 5 blocking the laser beam scanning, the first electrodes 5 corresponding to the two processing stations are offset from the positions corresponding to the respective processing stations. The offset here means that the position of the first electrode 5 of the second processing station contacting the battery cell is offset relative to the position of the first processing station contacting the battery cell. The area irradiated by the second laser may include the part blocked by the first electrode 5 during the first laser irradiation, and the area irradiated by the laser at the first processing station also includes the laser irradiation area blocked by the first electrode 510 located at the second processing station at the second processing station. This part of the content has been disclosed in the patent previously submitted by the applicant and will not be repeated here.

[0048] 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.

[0049] It should also be noted that, in this document, relational terms such as first and second, etc. are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations.

[0050] 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 solar cells, comprising at least one processing station, the laser induced sintering device for solar cells comprising a carrying device and a laser processing module and a conductive module arranged at the processing station, the carrying device comprising at least one carrying platform, the laser processing module and the conductive module are located above the carrying platform, characterized in that: The surface of the carrier platform is provided with a first conductive plate and a second conductive plate separately along a first direction, the upper surfaces of the first conductive plate and the second conductive plate are at the same height, the space between the first conductive plate and the second conductive plate is called an electrical isolation area, and the first conductive plate, the second conductive plate and the surface of the electrical isolation area together constitute a battery cell carrier area; The conductive module includes a first electrode and a conductive member separately arranged along a first direction, the first electrode is used to contact the battery cells carried in the battery cell carrying area corresponding to the surface of one of the conductive plates or the battery cells carried in the battery cell carrying area corresponding to the surface of the electrical isolation area, and the conductive member is used to contact the other conductive plate.

2. The laser induced sintering device for solar cells according to claim 1, characterized in that: The first conductive plate and the second conductive plate are rectangular and are arranged in parallel.

3. The laser induced sintering device for solar cells according to claim 1, characterized in that: The first conductive plate and the second conductive plate are of the same or different sizes. When the first conductive plate and the second conductive plate are of the same size, the first conductive plate and the second conductive plate are symmetrically arranged relative to the central axis of the supporting platform along the second direction, and the second direction is perpendicular to the first direction.

4. The laser induced sintering device for solar cells according to claim 1, characterized in that: The width of the electrical isolation area in the first direction is 5 mm to 190 mm, or the width of the electrical isolation area in the first direction is smaller than the length of the gate line area on the battery cell.

5. The laser induced sintering device for solar cells according to claim 1, characterized in that: The laser processing module includes a laser for emitting a laser beam and a laser scanning mechanism for controlling the laser beam. The laser scanning mechanism controls the laser beam to scan an area on the battery sheet other than the first electrode contact position.

6. The laser induced sintering device for solar cells according to claim 1, characterized in that: The width of the battery cell supporting area is smaller than the outer contour width of the first conductive plate and the second conductive plate, and the conductive member is used to contact the non-battery cell supporting area of ​​the conductive plate surface that contacts the conductive member of the two conductive plates.

7. The laser induced sintering device for solar cells according to claim 1, characterized in that: It also includes a lifting drive mechanism connected to the conductive module. When the supporting platform is located at the processing station, and if the conductive plate used to contact the conductive member at this time is the first conductive plate, the projection of the conductive member on the horizontal plane is located in an area outside the battery cell supporting area, and the projection of the first electrode on the horizontal plane is located in the battery cell supporting area corresponding to the surface of the second conductive plate or in the battery cell supporting area corresponding to the surface of the electrical isolation area. The lifting drive mechanism drives the conductive member to lift and lower so that the conductive member contacts or moves away from the first conductive plate, and drives the first electrode to lift and lower so that the first electrode contacts or moves away from the battery cell.

8. The laser induced sintering device for solar cells according to claim 1, characterized in that: The first electrode is at least one strip electrode extending along a second direction, and the second direction is perpendicular to the first direction.

9. The laser induced sintering device for solar cells according to claim 1, characterized in that: The conductive member is at least one conductive column or a strip electrode extending along a second direction, and the second direction is perpendicular to the first direction.

10. The laser induced sintering device for solar cells according to claim 1, characterized in that: A partition insulating strip is arranged in the electrical partition area, and the upper surface of the partition insulating strip is located at the same horizontal plane as the upper surfaces of the first conductive plate and the second conductive plate.

11. The laser induced sintering device for solar cells according to claim 1, characterized in that: The support platform is a negative pressure adsorption support platform, that is, an adsorption cavity is arranged inside the support platform, a plurality of first adsorption channels are arranged on the surface of the support platform, the first adsorption channels are connected to the adsorption cavity, the adsorption cavity is used to connect to a vacuum generating device, a plurality of second adsorption channels are arranged on the surfaces of the first conductive plate and the second conductive plate, the second adsorption channels are connected to the first adsorption channels.

12. The laser induced sintering device for solar cells according to claim 1, characterized in that: The carrier platform is divided into a first carrier platform and a second carrier platform. The first conductive plate is arranged on the surface of the first carrier platform, and the second conductive plate is arranged on the surface of the second carrier platform.

13. The laser induced sintering device for solar cells according to any one of claims 1 to 12, characterized in that: The carrying device includes a plurality of the carrying platforms, and the carrying device also includes a rotation driving mechanism connected to the plurality of the carrying platforms. The plurality of the carrying platforms are circumferentially connected to the rotation driving mechanism, and the rotation driving mechanism is used to drive the plurality of the carrying platforms to rotate and move to the processing station.

14. The laser induced sintering device for solar cells according to claim 13, characterized in that: There are four carrier platforms, two processing stations and two of them are adjacent to each other. Both processing stations are provided with the conductive module. The positions of the battery cells corresponding to the first electrodes of the two processing stations are offset.

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