A cutting system and photovoltaic silicon wafer

Abstract

The application provides a cutting system and a photovoltaic silicon wafer. The cutting system comprises a take-up reel, a tension reel, a main roller and a cutting line wound on the take-up reel, the tension reel and the main roller in sequence; the axis direction of the take-up reel is parallel to the axis direction of the tension reel, the cutting line has a first included angle between the incoming direction and the outgoing direction on the tension reel, and the first included angle is 100-180 degrees; the cutting system further comprises a first driving member connected with the take-up reel, and the first driving member is used to drive the take-up reel to move along the axis direction. The application can drive the take-up reel to move along the axis direction by the first driving member, so that the cutting line can smoothly transition when passing through the tension reel, and the cutting line coming out of the take-up reel can smoothly transition when passing through the tension reel without additional tension adjustment structure on the tension reel, thereby avoiding the problems of oblique pulling and wire breakage.

Description

Technical Field

[0001] This application belongs to the field of photovoltaic processing technology, specifically relating to a cutting system and photovoltaic silicon wafers. Background Technology

[0002] A slicing machine is a high-efficiency machine tool used to process silicon ingots into silicon wafers. Typically, a slicing machine includes a cutting system that uses a cutting wire to reciprocate and cut the silicon ingot to obtain silicon wafers. The cutting system usually includes a feed reel, a guide reel, a tension reel, a reversing reel, a main roller, a take-up reel, and a cutting wire wound on these reels. The silicon ingot is cut by the reciprocating motion of the cutting wire on the feed reel, main roller, and take-up reel.

[0003] Because the cutting wire needs to pass through multiple guide roller structures, the tension on the cutting wire inevitably varies, which leads to problems such as wire pulling and breakage during silicon wafer cutting. Utility Model Content

[0004] This application aims to provide a cutting system and a photovoltaic silicon wafer to solve the problem of excessive tension difference in existing cutting lines, which leads to skewing and breakage of the cutting lines.

[0005] To solve the above-mentioned technical problems, this application is implemented as follows: In a first aspect, this application discloses a cutting system comprising: a take-up / feed-out reel, a tension reel, a main roller, and a cutting wire sequentially wound around the take-up / feed-out reel, the tension reel, and the main roller; wherein... The axial direction of the take-up and release reel is parallel to the axial direction of the tension wheel, and the cutting line has a first angle between the inlet direction and the outlet direction on the tension wheel, the first angle being 100°-180°. The cutting system further includes a first drive unit connected to the take-up and release reel, the first drive unit being used to drive the take-up and release reel to move along its axial direction.

[0006] Optionally, the first included angle is 150°-180°.

[0007] Optionally, the cutting system has a cutting chamber, and the take-up and untake-down reel is disposed on the side of the cutting chamber or below the cutting chamber.

[0008] Optionally, the cutting system further includes a sliding mechanism connected to the take-up and untake-up reel, the sliding mechanism being used to guide the movement of the take-up and untake-up reel.

[0009] Optionally, the cutting system further includes a frame, on which the take-up and untake-up reels, the tension reel, and the main roller are all mounted; The sliding mechanism includes a slide rail and a slider. The extension direction of the slide rail is parallel to the axial direction of the take-up and untake-up reel. The slide rail is mounted on the frame, and the slider is mounted on the take-up and untake-up reel. The slider is slidably connected to the slide rail along the extension direction of the slide rail.

[0010] Optionally, the cutting system further includes a take-up and undo compartment; The take-up and pay-off reels include a take-up reel and a pay-off reel, and the tension reel includes a first tension reel located between the take-up reel and the main roller and a second tension reel located between the pay-off reel and the main roller; The take-up reel, the pay-off reel, the first tension wheel, and the second tension wheel are disposed in the same take-up / pay-off compartment, or the take-up reel and the first tension wheel are disposed in one take-up / pay-off compartment, and the pay-off reel and the second tension wheel are disposed in another take-up / pay-off compartment.

[0011] Optionally, the distance between the take-up and release reel and the tension reel is 10cm-100cm.

[0012] Optionally, the take-up and pay-off reels include a take-up reel and a pay-off reel, and the cutting system further includes a reversing wheel located in the cutting chamber, the reversing wheel corresponding to the take-up reel and the pay-off reel respectively.

[0013] Optionally, there is a first distance between the take-up reel and the corresponding reversing reel, and a second distance between the pay-off reel and the corresponding reversing reel, wherein the difference between the first distance and the second distance is D, and D≤1.5m.

[0014] Secondly, this application also discloses a photovoltaic silicon wafer, wherein the distance between the highest and lowest points of any line trace on the silicon wafer in a first direction is 1mm-2mm.

[0015] The cutting system of this application sets the axis of the take-up and release reel parallel to the axis of the tension wheel. At the same time, it controls the first angle between the entry and exit directions of the cutting wire on the tension wheel to be between 100° and 180°. The first driving member drives the take-up and release reel to move along its axis, so that the cutting wire can smoothly pass through the tension wheel. No additional tension adjustment structure is required on the tension wheel to ensure that the cutting wire coming out of the take-up and release reel can smoothly pass through the tension wheel, without the problem of the cutting wire being pulled at an angle or breaking due to excessive tension difference on the cutting wire.

[0016] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0017] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is one of the structural schematic diagrams of a cutting system described in the embodiments of this application; Figure 2 This is a second schematic diagram of the structure of a cutting system described in the embodiments of this application; Figure 3 This is one of the structural schematic diagrams of another cutting system described in the embodiments of this application; Figure 4 This is a second schematic diagram of another cutting system described in the embodiments of this application.

[0018] Explanation of reference numerals in the attached drawings: 11- take-up and pay-off reel, 111- take-up reel, 112- pay-off reel, 12- tension wheel, 121- first tension wheel, 122- second tension wheel, 13- main roller, 14- cutting wire, 15- sliding mechanism, 151- slide rail, 152- slider, 16- reversing wheel, 17- cutting chamber. Detailed Implementation

[0019] The embodiments of this utility model will now be described in detail. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model. All other embodiments obtained by those skilled in the art based on the embodiments in this application without inventive effort are within the scope of protection of this application.

[0020] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly include one or more of the features. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0021] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0022] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0023] In existing technologies, during the cutting of silicon rods with steel wire, a deviation correction device is typically installed in the cutting wire management system to adjust the tension difference of the cutting wire and prevent it from skewing. However, introducing a deviation correction device into the cutting wire management system can increase the tension difference when the tension difference of the cutting wire itself is small, leading to skewing and breakage of the cutting wire, thus affecting the cutting effect.

[0024] This application provides a cutting system that can be used in a slicing machine to perform the operation of cutting silicon rods. Specifically, the cutting system can perform dense, continuous cutting along the silicon rod using a multi-wire cutting method to obtain usable silicon wafers.

[0025] Reference Figure 1 The diagram shows a structural schematic of a cutting system according to one embodiment of this application, with reference to... Figure 2 This illustration shows a structural schematic diagram of a cutting system according to another embodiment of this application. Figure 1 and Figure 2As shown, the cutting system may specifically include: a take-up / feed-out reel 11, a tension wheel 12, a reversing wheel 16, a main roller 13, and a cutting wire 14 sequentially wound on the take-up / feed-out reel 11, the tension wheel 12, and the main roller 13; wherein, the axial direction of the take-up / feed-out reel 11 is parallel to the axial direction of the tension wheel 12, and the cutting wire 14 has a first included angle α between its entry direction and exit direction on the tension wheel 12, the first included angle α being 100°-180°; the cutting system may further include a first driving member (not shown in the figure) connected to the take-up / feed-out reel 11, the first driving member being used to drive the take-up / feed-out reel 11 to move along its axial direction x.

[0026] In this embodiment, the cutting system sets the axial direction of the take-up and release reel 11 parallel to the axial direction of the tension wheel 12. Simultaneously, the first angle α between the entry and exit directions of the cutting wire 14 on the tension wheel 12 is controlled between 100° and 180°. This prevents excessive fluctuations in the cutting wire 14 when it enters the tension wheel 12 when the first angle α is less than 100°. Within the first angle α range of this application, the first driving member drives the take-up and release reel 11 to move along its axial direction. The movement of the take-up and release reel 11 ensures that the cutting wire 14 does not tilt when passing the tension wheel 12, i.e., the cutting wire 14 does not experience slant pulling or breakage. With the cutting system of this application, no additional tension adjustment structure is required on the tension wheel 12. When the cutting line 14 on the take-up and release wheel 11 is pulled at an angle during its passage through the tension wheel 12, the position of the cutting line 14 is adjusted by the movement of the take-up and release wheel 11 in its axial direction x. This ensures that the cutting line 14 entering the tension wheel 12 transitions smoothly. Therefore, there is no need to set a correction device on the tension wheel 12 to adjust the tension on the cutting line 14, which simplifies the structure on the tension wheel 12, has less impact on the cutting line 14, and will not cause problems such as the cutting line 14 being pulled at an angle or breaking due to unreasonable tension adjustment.

[0027] It should be noted that, as Figure 1 and Figure 2 As shown, the entry and exit directions of the cutting wire 14 on the tension wheel 12 can be represented by the arrows in the figure. The first angle α between the entry and exit directions on the tension wheel 12 is specifically the angle between the entry and exit directions of the cutting wire 14 on the tension wheel 12 along the wire's path. It can be understood that the more the cutting wire 14 wraps around the tension wheel 12, the larger the angle α, the higher the tension stability of the cutting wire 14, and the smaller the tension difference on the cutting wire 14.

[0028] Reference Figure 3 This shows one of the structural schematic diagrams of another cutting system according to an embodiment of this application, with reference to... Figure 4This illustrates a second structural schematic diagram of another cutting system described in an embodiment of this application. (Combined with...) Figure 3 and Figure 4 The take-up and pay-off reels 11 may include a take-up reel 111 and a pay-off reel 112. The tension reel 12 may include a first tension reel 121 located between the take-up reel 111 and the main roller 13, and a second tension reel 122 located between the pay-off reel 112 and the main roller 13. The pay-off reel 112 can be used to provide cutting wire 14 for cutting. Figure 3 As shown, the first tension wheel 121 is disposed between the take-up wheel 111 and the main roller 13. The first tension wheel 121 can guide the cutting wire 14 on the take-up wheel 111 to the corresponding reversing wheel 16 according to a preset trajectory, and then through the reversing wheel 16 into the main roller 13 to participate in the cutting of the silicon rod. It also adjusts the tension of the cutting wire 14 between the take-up wheel 111 and the main roller 13, thereby improving the cutting stability of the cutting wire 14 in cutting the silicon rod. Figure 4 As shown, the feed roller 112 is used to feed out the cutting wire 14. The second tension roller 122 is disposed between the feed roller 112 and the corresponding reversing roller 16. The cutting wire 14 fed out from the main roller 13 is guided to the feed roller 112. By adjusting the tension of the cutting wire 14 between the main roller 13 and the feed roller 112, the tension stability of the cutting wire 14 is improved, thereby increasing the service life of the cutting wire 14.

[0029] It should be noted that in practical applications, the functions of the take-up reel 111 and the pay-off reel 112 can be interchanged during the reciprocating cutting of the silicon rod using the cutting wire 14. For example, during the switching between forward and reverse cutting of the silicon rod, the pay-off reel 112 during forward cutting can be switched to the take-up reel 111 during reverse cutting, and correspondingly, the take-up reel 111 during forward cutting can be switched to the pay-off reel 112 during reverse cutting. Therefore, this embodiment only uses one of the take-up reel 111 and the pay-off reel 112 as an example for explanation.

[0030] In this embodiment, during the take-up and undoing process of the take-up and undo reel 11, the movement of the take-up and undo reel 11 along its axial direction ensures that the cut wire 14 released or retracted by the take-up and undo reel 11 is within the groove on the tension wheel 12. This prevents the cut wire 14 from being misaligned due to not being within the groove on the tension wheel 12, reduces the friction between the cut wire 14 and the groove wall of the tension wheel 12 caused by the misalignment of the cut wire 14, and lowers the probability of wear, derailment, or breakage of the cut wire 14 caused by friction between the cut wire 14 and the groove wall of the tension wheel 12. This is beneficial to improving the cutting quality of the silicon rod by the cut wire 14.

[0031] In this embodiment, during the silicon wafer cutting process, the take-up and untake-down rollers 11 can move along their axial direction, changing the position of the cutting wire on the tension roller when it enters the tension roller. That is, the cutting wire entering the tension roller is adjusted. After adjustment, the cutting wire does not deviate after entering the tension roller and the reversing roller. No correction design is needed on the tension roller 12. Only a second driving component needs to be set on the tension roller 12, without the need for a tension adjustment structure. This simplifies the structure on the tension roller and prevents incorrect tension adjustment by the tension adjustment structure on the tension roller. The structure of this application is simple and reduces the probability of the cutting wire being pulled at an angle when passing through the tension roller.

[0032] It is understood that the second driving component mentioned in this application can be a motor or a hydraulic cylinder, etc., mainly used to drive the tension wheel 12 to rotate in a direction perpendicular to its axis.

[0033] For example, the first driving component can be a motor, hydraulic cylinder, or other driving component capable of driving the take-up and release reel 11 to perform linear motion. This application embodiment does not specifically limit the form of the first driving component.

[0034] In practical applications, a rotation drive can also be provided on the take-up and release reel 11. The rotation drive can be used to drive the take-up and release reel 11 to rotate to realize the function of take-up and release of wire. The rotation drive can adjust the take-up and release speed of the cutting wire 14 by adjusting the rotation speed of the take-up and release reel 11, so that the take-up and release speed of the cutting wire 14 can match the cutting speed of the cutting wire 14 on the main roller 13, so as to achieve stable cutting.

[0035] Furthermore, since the take-up and release reel 11 is equipped with the aforementioned rotation drive, even if the cutting wire is pulled at an angle by the tension wheel 12, the take-up and release speed of the take-up and release reel 11 can be adjusted by rotating the drive, and at the same time, the position of the cutting wire 14 when entering the tension wheel 12 can be adjusted by adjusting the movement of the take-up and release reel 11 along its axial direction. This ensures that the cutting wire 14 is always within the groove of the tension wheel 12 when it passes through the tension wheel 12, thus avoiding the occurrence of skewing.

[0036] In some optional embodiments of this application, the cutting system may further include a second driving member connected to the tension wheel 12. The second driving member can be used to drive the tension wheel 12 to move in a direction perpendicular to its axis, so as to adjust the tension on the cutting line 14 by the movement of the tension wheel 12 in a direction perpendicular to its axis, so as to make the tension on the cutting line 14 more stable.

[0037] like Figure 1 and Figure 2As shown, by moving the take-up and untake-up reel 11 along its axial direction, in conjunction with the movement of the tension wheel 12 in a direction perpendicular to its axial direction, the relative positions of the tension wheel 12 and the take-up and untake-up reel 11 can be changed, so that the tension wheel 12 and the take-up and untake-up reel 11 are in a position that allows for the adjustment of their relative positions. Figure 1 The position shown is the same as Figure 2 Switching between the indicated positions adjusts the tension on the cutting line 14, correcting deviations in the cutting line 14 when it shifts.

[0038] For example, the movement of the tension wheel 12 along a direction perpendicular to its axis can be rotation; however, this embodiment does not specifically limit the movement mode of the tension wheel 12. The second driving component can be a motor or a hydraulic cylinder, etc.; similarly, this embodiment does not specifically limit the form of the second driving component.

[0039] In this embodiment, the first angle between the entry direction and the exit direction of the cutting wire 14 on the tension wheel 12 can be 100°-180°. In practical applications, the larger the value of the first angle, the smoother the transition of the cutting wire 14 on the tension wheel 12. By setting the value of the first angle between 100° and 180°, the cutting wire 14 can transition smoothly on the tension wheel 12, making the tension on the cutting wire 14 more stable.

[0040] Optionally, the first included angle is 150°-180°. In practical applications, by further increasing the value of the first included angle, the transition of the cutting line 14 on the tension wheel 12 can be made smoother, thereby further improving the tension stability on the cutting line 14. Moreover, since when the first included angle is less than 150°, the time required to adjust the cutting line 14 on the take-up and untake-down wheel 11 is longer when a high line occurs, which will affect the cutting efficiency. Therefore, in this embodiment, by further controlling the value of the first included angle to be greater than 150°, the cutting efficiency of the cutting system can be improved.

[0041] It should be noted that, for those skilled in the art, the high line mentioned in this application can be understood as a cutting line that detaches from or deviates from the original cutting groove during the cutting process, resulting in the cutting line overlapping or intersecting with the cutting lines in adjacent or nearby cutting grooves, thereby affecting the cutting stability and, in severe cases, causing the line to break.

[0042] For example, the value of the first included angle can be any one of 150°, 155°, 165°, 170° or 180°. This application embodiment does not specifically limit the value of the first included angle.

[0043] In this embodiment, the cutting system may have a cutting chamber (not shown in the figure), and the take-up and untake-down reel 11 is disposed on the side or below the cutting chamber to achieve flexible layout of the take-up and untake-down reel 11. In practical applications, the take-up and untake-down reel 11 can be disposed on the side or below the cutting chamber according to actual needs, and only the position of the tension wheel 12 needs to be adjusted accordingly. This application does not make specific limitations on the placement of the take-up and untake-down reel 11.

[0044] like Figures 1 to 4 As shown, the cutting system may also include a sliding mechanism 15, which is connected to the take-up and untake-up reel 11. The sliding mechanism 15 can be used to guide the take-up and untake-up reel 11 to move, thereby improving the moving accuracy of the take-up and untake-up reel 11 along its axial direction, avoiding positional deviation of the take-up and untake-up reel 11 during movement, and improving the smoothness of the movement of the take-up and untake-up reel 11 along its axial direction.

[0045] Optionally, the cutting system may further include a frame (not shown in the figure), on which the take-up / feed-out reel 11, tension wheel 12, and main roller 13 are all mounted; the sliding mechanism 15 may specifically include a slide rail 151 and a slider 152. The extension direction of the slide rail 151 is parallel to the axial direction of the take-up / feed-out reel 11. The slide rail 151 is mounted on the frame, and the slider 152 is mounted on the take-up / feed-out reel 11. The slider 152 is slidably connected to the slide rail 151 along its extension direction. In practical applications, by sliding the slider 152 on the slide rail 151 along its extension direction, the take-up / feed-out reel 11 can be driven to move along its axial direction, improving the movement accuracy of the take-up / feed-out reel 11 along its axial direction.

[0046] It should be noted that, in practical applications, the slide rail 151 can also be connected to the take-up and put-down reel 11, and the slider 152 can be connected to the frame. This embodiment does not specifically limit the arrangement of the slide rail 151 and the slider 152. Furthermore, the entire sliding mechanism 15 can be arranged at the bottom or side of the take-up and put-down reel 11 as needed. This embodiment does not specifically limit the location of the sliding mechanism 15 accordingly.

[0047] like Figure 3 and Figure 4 As shown, the cutting system may also include a take-up and pay-off bin (not shown in the figure); the take-up and pay-off reels 11 may include a take-up reel 111 and a pay-off reel 112, and the tension reel 12 may include a first tension reel 121 located between the take-up reel 111 and the main roller 13 and a second tension reel 122 located between the pay-off reel 112 and the main roller 13.

[0048] Optionally, such as Figure 3 and Figure 4As shown, the take-up reel 111, the pay-off reel 112, the first tension wheel 121, and the second tension wheel 122 are arranged in the same take-up and pay-off bin, that is, the take-up reel 111 and the pay-off reel 112 are located on the same side of the main roller 13, so as to reduce the number of take-up and pay-off bins in the cutting system, simplify the structure of the cutting system, and reduce the volume occupied by the cutting system.

[0049] Optionally, the take-up reel 111 and the first tension reel 121 are disposed in one take-up / release bin, and the release reel 112 and the second tension reel 122 are disposed in another take-up / release bin. By disposing the take-up reel 111 and the release reel 112 in different take-up / release bins, interference between the cut wire 14 released by the take-up reel 111 and the cut wire 14 retracted by the release reel 112 can be avoided, thereby improving the stability of the take-up / release process of the cut wire 14.

[0050] It should be noted that whether the take-up reel 111 and the pay-off reel 112 are set in the same take-up and pay-off compartment or in different take-up and pay-off compartments, the lengths of the take-up reel 111 and the pay-off reel 112 to the guide wheel of the cutting compartment must be controlled to meet the requirements in order to obtain a better cutting effect.

[0051] In some optional embodiments of this application, the distance between the take-up / feed-out reel 11 and the tension reel 12 is 10cm-100cm. In practical applications, if the distance between the take-up / feed-out reel 11 and the tension reel 12 is too small, such as less than 10cm, interference may occur between them. Additionally, the adjustable space on the take-up / feed-out reel 11 is too small, limiting the range of adjustment. If the distance between the take-up / feed-out reel 11 and the tension reel 12 is too large, such as greater than 100cm, the tension stability of the cutting wire 14 is poor, the adjustment time is long, and the cutting efficiency is affected. By controlling the distance between the take-up / feed-out reel 11 and the tension reel 12 between 10cm and 100cm, interference between them can be avoided, while also balancing the tension stability of the cutting wire 14 and the adjustment time.

[0052] For example, the distance between the take-up and release reel 11 and the tension reel 12 can be 10cm, 30cm, 45cm, 70cm, 92cm, or 100cm, etc. In this embodiment of the application, the distance between the take-up and release reel 11 and the tension reel 12 is not specifically limited.

[0053] Optionally, the take-up and pay-off reels 11 include a take-up reel 111 and a pay-off reel 112. The cutting system may also include a reversing wheel 16, located in the cutting chamber 17, which corresponds to the take-up reel 111 and the pay-off reel 112 respectively. Specifically, as shown... Figure 3 and Figure 4As shown, the cutting wire 14 released by the feed reel 112 can sequentially pass through the second tension reel 122 into the cutting chamber 17, and then be redirected by the reversing reel 16 corresponding to the feed reel 112 within the cutting chamber 17 before entering the main roller 13. Similarly, the wire released by the main roller 13 can be redirected by the reversing reel 16 corresponding to the take-up reel 111 within the cutting chamber 17, and then pass through the first tension reel 121 before reaching the take-up reel 111 for take-up operation. The reversing reel 16 within the cutting chamber 17 allows for better entry and exit of the cutting wire 14 from the main roller 13.

[0054] In some optional embodiments of this application, the take-up reel 111 and the corresponding reversing reel 16 have a first distance, and the pay-off reel 112 and the corresponding reversing reel 16 have a second distance. The difference between the first distance and the second distance is D, where D ≤ 1.5m, to further reduce the tension difference on the cutting wire 14 and achieve stable cutting of the silicon rod by the cutting wire 14. In practical applications, when the difference D between the first distance and the second distance is too large, the tension difference on the cutting wire 14 is too large, which will affect the cutting stability of the silicon rod by the cutting wire 14.

[0055] For example, the difference D between the first distance and the second distance can be 0m, 0.3m, 0.5m, 0.7m, 1.2m, or 1.5m. This application embodiment does not specifically limit the value of the difference D between the first distance and the second distance.

[0056] In summary, the cutting system described in the embodiments of this application can include at least the advantages mentioned above: The cutting system of this application sets the axis of the take-up and release reel parallel to the axis of the tension wheel. At the same time, it controls the first angle between the entry and exit directions of the cutting wire on the tension wheel to be between 100° and 180°. The first driving member drives the take-up and release reel to move along its axis, so that the cutting wire can smoothly pass through the tension wheel. No additional tension adjustment structure is required on the tension wheel to ensure that the cutting wire coming out of the take-up and release reel can smoothly pass through the tension wheel, without the problem of the cutting wire being pulled at an angle or breaking due to excessive tension difference on the cutting wire.

[0057] This application also provides a photovoltaic silicon wafer, which can be cut using the above-described cutting system. Specifically, the distance between the highest and lowest points of any line on the silicon wafer in the first direction is 1mm-2mm.

[0058] In this embodiment, by using the slicing system described in the above embodiment to adjust the slicing process, the distance between the highest and lowest points of any line mark on the photovoltaic silicon wafer in the first direction can be controlled to be 1mm-2mm, thereby controlling the flatness quality of the entire photovoltaic silicon wafer surface, so that the solar cells prepared from the photovoltaic silicon wafer have higher efficiency.

[0059] It should be noted that the first direction described in this application is the extension direction of the trace on the silicon wafer. The distance between the highest point and the lowest point on the trace is the distance between the vertex and the lowest point of the trace along the extension direction of the trace. For those skilled in the art, the trace is generally arc-shaped, and the highest point and the lowest point of the trace along the extension direction of the trace are the distance between the vertex and the bottom of the arc.

[0060] In practical applications, when the quality of the traces on the photovoltaic silicon wafer meets the above requirements, after processing the film layer on the surface of the photovoltaic silicon wafer, during the printing of electrode grid lines on the film layer, because the silicon wafer exhibits relatively uniform flatness, the width and thickness of the electrode grid lines are correspondingly more uniform, resulting in lower grid line resistance, which is beneficial for current conduction on the grid lines. Therefore, the photoelectric conversion efficiency of the cell using the silicon wafer can be improved.

[0061] For example, the distance between the highest and lowest points on the line mark of the photovoltaic silicon wafer can be 1mm, 1.2mm, 1.3mm, 1.5mm, 1.8mm, or 2mm, and this application embodiment does not specifically limit this.

[0062] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0063] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A cutting system, characterized in that, The cutting system includes: a take-up / feed-out reel, a tension reel, a main roller, and a cutting wire wound on the take-up / feed-out reel, the tension reel, and the main roller; wherein... The axial direction of the take-up and release reel is parallel to the axial direction of the tension wheel, and the cutting line has a first angle between the inlet direction and the outlet direction on the tension wheel, the first angle being 100°-180°. The cutting system further includes a first drive unit connected to the take-up and release reel, the first drive unit being used to drive the take-up and release reel to move along its axial direction.

2. The cutting system according to claim 1, characterized in that, The first included angle is 150°-180°.

3. The cutting system according to claim 1, characterized in that, The distance between the take-up and release reel and the tension reel is 10cm-100cm.

4. The cutting system according to claim 1, characterized in that, The cutting system also includes a sliding mechanism connected to the take-up and untake-up reel, which guides the movement of the take-up and untake-up reel.

5. The cutting system according to claim 4, characterized in that, The cutting system also includes a frame, and the take-up and untake-out reel, the tension wheel and the main roller are all mounted on the frame; The sliding mechanism includes a slide rail and a slider. The extension direction of the slide rail is parallel to the axial direction of the take-up and pay-off reel. The slide rail is mounted on the frame, and the slider is mounted on the take-up and pay-off reel. The slider is slidably connected to the slide rail along the extension direction of the slide rail.

6. The cutting system according to claim 1, characterized in that, The cutting system also includes a take-up and feed compartment; The take-up and pay-off reels include a take-up reel and a pay-off reel, and the tension reel includes a first tension reel located between the take-up reel and the main roller and a second tension reel located between the pay-off reel and the main roller; The take-up reel, the pay-off reel, the first tension reel, and the second tension reel are disposed in the same take-up / pay-off compartment, or the take-up reel and the first tension reel are disposed in one take-up / pay-off compartment, and the pay-off reel and the second tension reel are disposed in another take-up / pay-off compartment.

7. The cutting system according to claim 1, characterized in that, The cutting system has a cutting chamber, and the take-up and untake-down reel is located on the side of the cutting chamber or below the cutting chamber.

8. The cutting system according to claim 6, characterized in that, The take-up and pay-off reels include a take-up reel and a pay-off reel. The cutting system also includes a reversing wheel located in the cutting chamber, which corresponds to the take-up reel and the pay-off reel, respectively.

9. The cutting system according to claim 8, characterized in that, There is a first distance between the take-up reel and the corresponding reversing reel, and there is a second distance between the pay-off reel and the corresponding reversing reel. The difference between the first distance and the second distance is D, where D ≤ 1.5m.

10. A photovoltaic silicon wafer, characterized in that, The distance between the highest and lowest points of any line on the silicon wafer in the first direction is 1mm-2mm.

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