IBC battery
By designing the interdigit electrode and symmetrically distributed marking points on the back of the IBC battery, and using the camera to identify the direction, the problem of direction confusion during the transmission of the IBC battery is solved, and the accurate positioning and sequence recognition of the battery are achieved.
Patent Information
- Application Number
- CN202422224524.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-10
- Publication Date
- 2025-07-08
- Estimated Expiration
- 2034-09-10
AI Technical Summary
During the transmission process, the direction confusion caused by the cross-arrangement of N-type and P-type metal gate lines is difficult to identify.
The interdigital electrode and four marking points are designed on the back of the IBC battery. The marking points have symmetric distributions and different shapes. The camera is used to identify the direction to correct placement errors.
It effectively solves the problem that the positive electrode and negative electrode are difficult to identify due to the wrong direction during the transmission process of IBC batteries, and realizes accurate positioning and sequence recognition of the battery.
Smart Images
Figure CN223080431U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the technical field of all-back electrode solar cells, and particularly to an IBC cell. Background Art
[0002] The interdigitated back contact cell, namely the IBC cell (interdigitated back contact), has no electrode on the front side of the cell, and the metal grid lines of the positive and negative electrodes are arranged in a finger-like cross pattern on the back of the cell. In industrial production, IBC cells of the same batch are produced and transported on the production line, and subsequent IV tests of the cell wafers, collection of the cell wafers, or assembly of photovoltaic modules are required.
[0003] However, since the N-type (negative electrode) and P-type (positive electrode) metal grid lines in the electrode structure are arranged in a finger-like cross pattern on the back of the cell, there is no obvious demarcation point between the N-type metal grid line and the P-type metal grid line. During subsequent processes, the problem of chaotic wafer feeding directions is likely to occur.
[0004] It should be noted that the above content is not necessarily prior art and does not limit the patent protection scope of this application. Summary of the Utility Model
[0005] Embodiments of this application provide an IBC cell to solve or alleviate one or more of the above-mentioned technical problems.
[0006] Embodiments of this application provide an IBC cell, the back of the IBC cell includes interdigitated electrodes and four identification points;
[0007] The interdigitated electrodes include a negative main grid, a positive main grid, and alternately distributed negative fine grids and positive fine grids. The negative fine grids converge on the negative main grid, and the positive fine grids converge on the positive main grid;
[0008] The shape of the IBC cell is an axisymmetric figure with two axes of symmetry, and the four identification points are symmetrically distributed along the two axes of symmetry;
[0009] Among them, taking the direction where the positive fine grid is located as the first direction and the direction where the positive main grid is located as the second direction, the shapes of the identification points located in the first direction are the same, and the shapes of the identification points located in the second direction are different.
[0010] In the embodiments of this application, four identification points with different main grid directions and the same fine grid direction are used for direction identification. When being transported on the conveyor belt, a fixed camera can identify an IBC cell with a placement direction different from the preset direction and adjust its direction. The embodiments of this application effectively solve the problem that it is difficult to identify the positive and negative electrodes of the IBC cell caused by incorrect placement directions during the transportation process.
[0011] According to an embodiment of the present application, in an IBC cell, the identification points are in a shape with a geometric center, and the geometric centers of the four identification points can form a rectangle. Thus, the rectangle formed by the geometric centers of the four identification points can be recognized by a camera in subsequent processes and play a role in positioning.
[0012] According to an embodiment of the present application, in an IBC cell, the shape of the identification points includes at least one of a rectangle, a triangle, a circle, a square, a rhombus, a parallelogram, a pentagram, and a regular hexagon. Thus, there are multiple choices for the shape of the identification points.
[0013] According to an embodiment of the present application, in an IBC cell, the thickness of the identification points is 3 μm to 20 μm. Thus, it is flush with the thickness of the main grid.
[0014] According to an embodiment of the present application, in an IBC cell, the materials of the four identification points are the same as the material of the positive main grid, the same as the material of the negative main grid, the same as the material of the negative fine grid, or the same as the material of the positive fine grid. Thus, when preparing the IBC cell, it can be printed simultaneously with the positive main grid, the negative main grid, the negative fine grid, or the positive fine grid, which is convenient for forming.
[0015] According to an embodiment of the present application, in an IBC cell, when the material of the identification points is the same as the material of the positive main grid or the negative main grid, the identification points are located between adjacent negative fine grids and positive fine grids, and the identification points do not contact the adjacent negative fine grids and positive fine grids. Thus, it is convenient to be printed and formed at one time with the positive main grid or the negative main grid.
[0016] According to an embodiment of the present application, in an IBC cell, when the material of the identification points is the same as the material of the negative fine grid, the identification points are located between adjacent positive fine grids, and the identification points do not contact the adjacent positive fine grids. Thus, it is convenient to be printed and formed at one time with the negative fine grid, and the isolation between the positive fine grid and the negative fine grid is achieved.
[0017] According to an embodiment of the present application, in an IBC cell, when the material of the identification points is the same as the material of the positive fine grid, the identification points are located between adjacent negative fine grids and do not contact the adjacent negative fine grids. Thus, it is convenient to be printed and formed at one time with the positive fine grid, and the isolation between the positive fine grid and the negative fine grid is achieved.
[0018] According to an embodiment of the present application, the IBC cell includes n-type silicon, the front surface of the n-type silicon is a textured surface, and an N + front surface field is diffused on the front surface, and a front passivation layer and a front antireflection layer are sequentially stacked on the textured surface; on the back surface of the n-type silicon, P + emitters arranged in an interdigitated pattern and N +Back surface field, a back surface passivation layer is provided on the back surface of the n-type silicon, and the interdigital electrodes are provided. The positive grid lines of the interdigital electrodes are in contact with the P + emitter, and the negative grid lines of the interdigital electrodes are in contact with the N + back surface field. Thus, the electrodes of the battery are all provided on the back of the battery, and there is no obstruction on the front of the battery.
[0019] According to an embodiment of the present application, the IBC battery includes one of a TBC battery and an HBC battery. Thus, sequential identification and positioning of different types of batteries are achieved. Description of the Drawings
[0020] In the drawings, unless otherwise specified, the same reference numerals throughout the several views denote the same or similar components or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings only depict some embodiments disclosed in the present application and should not be regarded as limiting the scope of the present application.
[0021] Figure 1 is a schematic structural diagram of the IBC battery provided by an embodiment of the present application;
[0022] Figure 2 is a schematic diagram of the IBC battery provided by an embodiment of the present application during transmission.
[0023] Description of the Reference Numerals:
[0024] 1 - IBC battery; 101 - negative main grid; 102 - negative fine grid; 201 - positive main grid; 202 - positive fine grid; 301 - first identification point; 302 - second identification point; 303 - third identification point; 304 - fourth identification point. Detailed Embodiments
[0025] In order to make the objectives, technical solutions, and advantages of the present application clearer, the present application will be further described in detail below with reference to the drawings and embodiments. It should be noted that, without conflict, the embodiments and features in the embodiments of the present application may be combined with each other. The present application will be described in detail below with reference to the drawings and embodiments.
[0026] It should be noted that in the description and claims of this application and the above-mentioned drawings, terms such as "first", "second", etc. are used to distinguish similar objects, and do not necessarily describe a specific order or sequence. It should be understood that such terms can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units does not necessarily limit to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.
[0027] In this application, when it comes to numerical intervals (i.e., numerical ranges), unless otherwise specified, the distribution of the optional numerical values within the numerical interval is considered continuous, and includes the two numerical endpoints of the numerical interval (i.e., the minimum value and the maximum value), as well as each numerical value between these two numerical endpoints. Unless otherwise specified, when the numerical interval only refers to the integers within the numerical interval, it includes the two endpoint integers of the numerical range, as well as each integer between the two endpoints, which is equivalent to directly listing each integer. When multiple numerical ranges are provided to describe features or characteristics, these numerical ranges can be combined. In other words, unless otherwise specified, the numerical ranges disclosed in this application should be understood to include any and all sub-ranges subsumed therein. The "numerical value" in the numerical interval can be any quantitative value, such as a number, a percentage, a ratio, etc. The "numerical interval" allows a broad inclusion of quantitative intervals such as percentage intervals, ratio intervals, and ratio value intervals.
[0028] The embodiment of the present application provides an IBC battery technical solution. Based on this, the problem of chaotic sheet feeding directions during the testing and photovoltaic module assembly processes of the IBC battery is solved. See the following for details.
[0029] Next, exemplary embodiments according to the present application will be described in more detail with reference to the drawings. It should be noted that these exemplary embodiments can be implemented in various different forms and should not be construed as being limited only to the embodiments described herein.
[0030] In some embodiments, as Figure 1 shown, the back surface of the IBC battery 1 includes interdigitated electrodes and four identification points;
[0031] The interdigitated electrodes include a negative main grid 101, a positive main grid 201, and alternately distributed negative fine grids 102 and positive fine grids 202. The negative fine grids 102 converge on the negative main grid 101, and the positive fine grids 202 converge on the positive main grid 201;
[0032] The shape of the IBC cell is an axisymmetric figure with two axes of symmetry, and the four identification points are symmetrically distributed along the two axes of symmetry;
[0033] Among them, taking the direction where the positive fine grid 202 is located as the first direction and the direction where the positive main grid 201 is located as the second direction, the shapes of the identification points located in the first direction are the same, and the shapes of the identification points located in the second direction are different.
[0034] In the embodiment of the present application, four identification points with different shapes in the main grid direction and the same shape in the fine grid direction are used for direction identification. When being transported on the conveyor belt, the fixed camera can identify the IBC cell with a placement direction different from the preset direction and adjust its direction. The embodiment of the present application effectively solves the problem that it is difficult to identify the positive and negative electrodes of the IBC cell caused by the wrong placement direction during the transportation process.
[0035] It can be understood that there are no grid lines on the front surface of the IBC cell, and P regions and N regions arranged at intervals in a finger-like shape are prepared on the back surface of the IBC cell, and metallization contacts and grid lines are respectively formed on them, that is, finger electrodes including positive grid lines and negative grid lines are correspondingly provided. Specifically, the IBC cell includes n-type silicon, the front surface of the n-type silicon is a textured surface, and an N front surface field is diffused on the front surface of the n-type silicon. A front surface passivation layer and a front surface antireflection layer are sequentially stacked on the textured surface; on the back surface of the n-type silicon, a finger-like arranged P emitter and an N back surface field are diffused. A back surface passivation layer and the finger electrode are provided on the back surface of the n-type silicon. The positive fine grid of the finger electrode is in contact with the P emitter, and the negative fine grid of the finger electrode is in contact with the N back surface field. Thus, the front surface field is an N front field, which uses the passivation effect to reduce the surface minority carrier concentration, thereby reducing the surface recombination rate. At the same time, it can also reduce the series resistance and improve the electron transport ability; the back surface is a finger-like arranged P emitter and an N back surface field formed by diffusion. The P emitter can form a p-n junction with the N-type silicon substrate to effectively shunt carriers, and the N back surface field region can form a high-low junction with the n-type silicon to enhance the carrier separation ability; SiO2 and SiN can be used as the passivation layer on the front and back surfaces to inhibit the carrier recombination on the surface of the IBC solar cell; the front surface antireflection layer can use a SiN film to improve the power generation efficiency; all the metal contact parts are in the positive and negative electrode contact areas on the back surface and are arranged in a finger-like shape. + region and N + region, and metalization contacts and grid lines are respectively formed on them, that is, finger electrodes including positive grid lines and negative grid lines are correspondingly provided. Specifically, the IBC cell includes n-type silicon, the front surface of the n-type silicon is a textured surface, and an N + front surface field is diffused on the front surface of the n-type silicon. A front surface passivation layer and a front surface antireflection layer are sequentially stacked on the textured surface; on the back surface of the n-type silicon, a finger-like arranged P + emitter and an N + back surface field are diffused. A back surface passivation layer and the finger electrode are provided on the back surface of the n-type silicon. The positive fine grid of the finger electrode is in contact with the P + emitter, and the negative fine grid of the finger electrode is in contact with the N + back surface field. Thus, the front surface field is an N + front field, which uses the passivation effect to reduce the surface minority carrier concentration, thereby reducing the surface recombination rate. At the same time, it can also reduce the series resistance and improve the electron transport ability; the back surface is a finger-like arranged P + emitter and an N + back surface field formed by diffusion. The P + emitter can form a p-n junction with the N-type silicon substrate to effectively shunt carriers, and the N + back surface field region can form a high-low junction with the n-type silicon to enhance the carrier separation ability; the front and back surfaces can use at least one of SiO2 and SiN x as the passivation layer to inhibit the carrier recombination on the surface of the IBC solar cell; the front surface antireflection layer can use a SiN x film to improve the power generation efficiency; all the metal contact parts are in the positive and negative electrode contact areas on the back surface and are arranged in a finger-like shape.
[0036] It should be noted that the shape of the IBC cell can be rectangular, quasi-rectangular or other shapes.
[0037] In some embodiments, taking the rectangular IBC cell as an example, the four identification points are respectively a first identification point 301, a second identification point 302, a third identification point 303 and a fourth identification point 304. Among them, the first identification point 301 and the second identification point 302 are distributed along the direction of the positive electrode fine grid, the third identification point 303 and the fourth identification point 304 are distributed along the direction of the positive electrode fine grid, the first identification point 301 and the fourth identification point 304 are distributed along the direction of the positive electrode main grid, the second identification point 302 and the fourth identification point 304 are distributed along the direction of the positive electrode main grid, the shapes of the first identification point 301 and the second identification point 302 are the same, the shapes of the third identification point 303 and the fourth identification point 304 are the same, and the shapes of the first identification point 301 and the third identification point 303 are different.
[0038] Furthermore, the identification point is a shape with a geometric center, and the geometric centers of the four identification points can form a rectangle. Thus, since the geometric centers of the four identification points can form a rectangle, and the rectangle can be recognized by the camera, it plays a role in positioning. Specifically, the offset of the IBC cell can be calculated based on this virtual rectangle for deviation correction. Further, the geometric centers of the four identification points form a rectangle, which can be a rectangle constructed with the geometric centers of the four identification points as the four corners, or a rectangle constructed with the geometric centers of the four identification points as the midpoints of the four sides.
[0039] Furthermore, it is only necessary that the identification point is a shape with a geometric center, and the embodiments of the present application do not limit this. Exemplarily, the shape of the identification point includes at least one of a rectangle, a triangle, a circle, a square, a rhombus, a parallelogram, a pentagram, and a regular hexagon. For example, the shapes of the first identification point 301 and the second identification point 302 can be rectangles, and the shapes of the third identification point 303 and the fourth identification point 304 can be two discontinuous rectangles.
[0040] In some embodiments, the thickness of the identification point is 3 μm to 20 μm, for example, 3 μm, 10 μm, 13 μm, 20 μm, etc. Thus, it is flush with the main grid thickness.
[0041] Optionally, when the identification point is rectangular, the two-dimensional size of the identification point can be 300 μm × 700 μm, 300
[0042] μm × 300 μm, 500 μm × 500 μm, and 500 μm × 1100 μm. Thus, it is adapted to the grid line spacing.
[0043] In some embodiments, the materials of the four identification points are the same as those of the negative main grid, the positive main grid, the negative fine grid, or the positive fine grid. Thus, when manufacturing the IBC cell, it can be printed simultaneously with the main grid, the negative fine grid, or the positive fine grid, facilitating shaping.
[0044] Furthermore, when the material of the identification point is the same as that of the main grid (negative main grid material or positive main grid material), the identification point is located between adjacent negative fine grids and positive fine grids, and the identification point does not contact the negative fine grid and the positive fine grid. Thus, it is convenient to be formed by printing with the negative main grid or the positive main grid at one time.
[0045] In a specific embodiment, referring to Figure 1 , the IBC cell is rectangular and has two axes of symmetry. On the back of the IBC cell, there are a first identification point 301, a second identification point 302, a third identification point 303, and a fourth identification point 304. The first identification point 301, the second identification point 302, the third identification point 303, and the fourth identification point 304 are symmetrically arranged with respect to the two axes of symmetry of the IBC cell. The materials of the first identification point 301, the second identification point 302, the third identification point 303, and the fourth identification point 304 are the same as those of the positive main grid. The first identification point 301 is located between adjacent positive fine grids 202 and negative fine grids 102, and the first identification point 301 does not contact the positive fine grid 202 and the negative fine grid 102. The positional relationships of the second identification point 302, the third identification point 303, and the fourth identification point 304 are the same as those of the first identification point 301, and will not be elaborated here.
[0046] In some embodiments, when the material of the identification point is the same as that of the negative fine grid, the identification point is located between adjacent positive fine grids, and the identification point does not contact the adjacent positive fine grids. Thus, it is convenient to be formed by printing with the negative fine grid at one time, and the isolation between the positive fine grid and the negative fine grid is achieved.
[0047] In some embodiments, when the material of the identification point is the same as that of the positive fine grid, the identification point is located between adjacent negative fine grids and does not contact any of the adjacent negative fine grids. Thus, it is convenient to be formed by printing with the positive fine grid at one time, and the isolation between the positive fine grid and the negative fine grid is achieved.
[0048] In some embodiments, the IBC cell includes one of a TBC cell and an HBC cell. Among them, the TBC cell is a combination of TopCon and IBC. The HBC cell is a combination of HJT and IBC. Thus, the sequential identification and positioning of different types of cells are realized.
[0049] In some embodiments, the TBC cell can be prepared by the following method, including the following steps: 1. Provide an N-type silicon wafer as the silicon substrate and polish the silicon substrate; 2. Perform low-pressure chemical vapor deposition (LPCVD) on the front and back surfaces of the silicon substrate to deposit a tunneling oxide layer and a Poly layer; 3. Perform boron diffusion on the back surface to form a p + Poly layer; 4. Remove the bsg layer (borosilicate glass layer) by laser; 5. Perform phosphorus diffusion on the back surface to form an n + Poly layer; 6. Clean and remove the psg (phosphosilicate glass layer) and bsg, and texture the front surface at the same time; 7. Prepare alumina on the front and back surfaces respectively as the passivation layer; 8. Prepare a SiN x film on the front surface as the front antireflection layer; 9. Print the main grid electrode and the identification points, then print the positive fine grid and the negative fine grid, sinter, anneal, and print the insulating glue.
[0050] Application Example
[0051] When the IBC cell of the embodiment of the present application is applied, referring to Figure 2 , it can be seen that there are multiple IBC cells being transported on the conveyor belt for subsequent processes.
[0052] When the placement direction of the IBC cell is correct, the first identification point 301 and the second identification point 302 on the IBC cell are located upstream of the conveyor belt, while when the placement direction of the IBC cell is incorrect, the third identification point 303 and the fourth identification point 304 on the IBC cell are located upstream of the conveyor belt;
[0053] If an IBC cell with an incorrect placement direction appears on the conveyor belt, the identification point will be recognized by a fixed-position camera, and the corresponding IBC cell will be picked up by a suction cup or rotated and then placed back on the conveyor belt;
[0054] At the same time, a rectangle can be constructed with the geometric centers of the four identification points as the four corners, and this rectangle can be recognized by the camera to monitor the offset of the IBC cell and correct the deviation according to the offset.
[0055] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.
[0056] For ease of description, the orientation or positional relationships indicated by orientation terms such as "front, rear, top, bottom, left, right", "horizontal, vertical, perpendicular, horizontal" and "top, bottom", etc. are usually based on the orientation or positional relationships shown in the drawings. This is only for the convenience of describing the present application and simplifying the description. Without contrary statements, these orientation terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation on the protection scope of the present application; the orientation terms "inside, outside" refer to the inside and outside relative to the contour of each component itself. For example, if the device in the drawing is inverted, the device described as "above other devices or structures" or "on top of other devices or structures" will be positioned as "below other devices or structures" or "beneath other devices or structures" afterwards. Thus, the exemplary term "above" can include both the orientations of "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and corresponding interpretations are made for the relative spatial descriptions used here.
[0057] Unless otherwise clearly specified and defined, terms such as "mounted", "connected", "coupled", "fixed", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection, an electrical connection, or a communication connection; it can be directly connected, or indirectly connected through an intermediate medium, and can be the internal connection or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.
[0058] Unless otherwise clearly specified and defined, the first feature being "above" or "below" the second feature can include the direct contact between the first and second features, or can also include the situation where the first and second features are not in direct contact but are in contact through other features between them. Moreover, the first feature being "above", "over", and "on top of" the second feature includes the first feature being directly above and diagonally above the second feature, or simply indicating that the first feature has a higher horizontal height than the second feature. The first feature being "below", "beneath", and "under" the second feature includes the first feature being directly below and diagonally below the second feature, or simply indicating that the first feature has a lower horizontal height than the second feature.
[0059] Unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present application. At the same time, it should be understood that, for the sake of convenience of description, the dimensions of the various parts shown in the drawings are not drawn in actual proportional relationship. Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such technologies, methods, and devices should be regarded as part of the authorization specification. In all the examples shown and discussed here, any specific value should be construed as merely exemplary, rather than as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.
[0060] It should also be noted that the "one embodiment", "another embodiment", "embodiment", etc. mentioned in this specification refer to the specific features, structures, or characteristics described in connection with that embodiment being included in at least one embodiment generally described in the present application. The same expression appearing in multiple places in the specification does not necessarily refer to the same embodiment. Further, when describing a specific feature, structure, or characteristic in connection with any embodiment, it is intended that the implementation of such feature, structure, or characteristic in combination with other embodiments also fall within the scope of the present application.
[0061] In the above embodiments, the descriptions of the various embodiments each have their own emphases. For parts not detailed in a certain embodiment, reference may be made to the relevant descriptions of other embodiments.
[0062] It should also be noted that the above are only the preferred embodiments of the present application, and do not limit the patent protection scope of the present application accordingly. Any equivalent structural or equivalent process transformation made by using the content of the specification and drawings of the present application, or directly or indirectly applied in other related technical fields, shall equally be included in the patent protection scope of the present application.
Claims
1. An IBC battery, characterized in that, The back surface of the IBC cell includes interdigitated electrodes and identification points; The interdigitated electrodes include a negative main grid, a positive main grid, and alternately distributed negative fine grids and positive fine grids. The negative fine grids converge on the negative main grid, and the positive fine grids converge on the positive main grid; The shape of the IBC cell is an axisymmetric figure with two axes of symmetry, and the four identification points are symmetrically distributed along the two axes of symmetry; Among them, taking the direction where the positive fine grid is located as the first direction and the direction where the positive main grid is located as the second direction, the shapes of the identification points located in the first direction are the same, and the shapes of the identification points located in the second direction are different.
2. The IBC cell according to claim 1, wherein The identification points are in the shape of a figure with a geometric center, and the geometric centers of the four identification points can form a rectangle.
3. The IBC cell according to claim 2, wherein The shape of the identification points includes at least one of a rectangle, a triangle, a circle, a square, a rhombus, a parallelogram, a pentagram, and a regular hexagon.
4. The IBC cell according to any one of claims 1 to 3, characterized in that, The thickness of the identification points is 3 μm to 20 μm.
5. The IBC cell according to claim 1, wherein The materials of the four identification points are the same as those of the positive main grid, the same as those of the negative main grid, the same as those of the negative fine grids, or the same as those of the positive fine grids.
6. The IBC cell according to claim 5, wherein, When the material of the identification point is the same as that of the positive main grid or the negative main grid, the identification point is located between adjacent negative fine grids and positive fine grids, and the identification point does not contact the adjacent negative fine grids and positive fine grids.
7. The IBC cell according to claim 5, wherein When the material of the identification point is the same as that of the negative fine grid, the identification point is located between adjacent positive fine grids, and the identification point does not contact the adjacent positive fine grids.
8. The IBC cell according to claim 5, characterized in that, When the material of the identification point is the same as that of the positive fine grid, the identification point is located between adjacent negative fine grids, and the identification point does not contact the adjacent negative fine grids.
9. The IBC cell according to claim 1, wherein, It includes n-type silicon, the front surface of the n-type silicon is a textured surface, and an N + front surface field is diffused on the front surface. A front passivation layer and a front anti-reflection layer are sequentially stacked on the textured surface; The back surface of the n-type silicon is diffused with P arranged in a finger-like pattern + emitter and N + back surface field. The back surface of the n-type silicon is provided with a back surface passivation layer and the finger electrodes. The positive fine grid of the finger electrodes is in contact with the P + emitter, and the negative fine grid of the finger electrodes is in contact with the N + back surface field.
10. The IBC battery according to claim 1, characterized in that, The IBC cell includes one of a TBC cell and an HBC cell.