Cell piece, cell piece stacking structure and solar cell module

Abstract

The utility model relates to the field of solar photovoltaic technology, in particular to a battery piece, a battery piece stacking structure and a solar battery assembly. In the battery piece, the plurality of first isolation bulges are arranged on the back surface of the battery piece body, and the first isolation bulges protrude out of the back surface of the battery piece body; the plurality of second isolation bulges are arranged on the front surface of the battery piece body and protrude out of the front surface of the battery piece body; the plurality of grid lines 40 are arranged on at least one surface of the battery piece body; in the thickness direction of the battery piece body, the height of at least one of the first isolation bulges and the second isolation bulges is greater than that of all the grid lines; and the plurality of second isolation bulges are projected on the back surface of the battery piece body, and the projection does not intersect with the first isolation bulges, or the projection partially intersects with the first isolation bulges. The arrangement of the first isolation protrusions and the second isolation protrusions effectively prevents the grid lines from making contact with the front face of the battery piece body.

Description

Technical Field

[0001] The utility model relates to the technical field of solar photovoltaics, and in particular to a battery sheet, a battery sheet stacking structure, and a solar cell assembly. Background Art

[0002] After the cell preparation is completed, it needs to be transported, for example, the cell is transported to the laminating equipment for the preparation of the battery assembly. When the cell is transported, multiple cells need to be stacked. In order to avoid scratches between cells during transportation, especially scratches on the back contact of the cell and the front of the cell, when the cell is stacked, isolation paper is used to block adjacent cells.

[0003] Obviously, placing the separator paper on the battery cell and removing it during the subsequent assembly production will increase the production process and affect production capacity. The number of times the separator paper can be used is limited, and discarding the separator paper will lead to a large waste of costs. Utility Model Content

[0004] In view of this, the utility model proposes a battery cell, a battery cell stacking structure, and a solar cell module, aiming to partially or completely solve the technical problems that when the existing battery cells use isolation paper isolation solution, the isolation paper is placed on the battery cells, and the isolation paper is removed during the subsequent module end production, which increases the production process and affects the production capacity; the isolation paper has a limited number of uses, and the discarding of the isolation paper leads to a large waste of costs.

[0005] In order to achieve the above object, the technical solution of the utility model is implemented as follows:

[0006] In a first aspect, an embodiment of the utility model provides a battery cell, which comprises a plurality of first isolation protrusions, a plurality of second isolation protrusions, a plurality of gate lines and a battery cell body; a plurality of the first isolation protrusions are arranged on the back side of the battery cell body, and the first isolation protrusions protrude from the back side of the battery cell body; a plurality of the second isolation protrusions are arranged on the front side of the battery cell body, and the second isolation protrusions protrude from the front side of the battery cell body; a plurality of the gate lines are arranged on at least one side of the battery cell body; in the thickness direction of the battery cell body, the height of at least one of the first isolation protrusions and the second isolation protrusions is greater than the height of all the gate lines; a plurality of the second isolation protrusions are projected on the back side of the battery cell body, and the projections have no intersection with the first isolation protrusions, or

[0007] Alternatively, the projection partially intersects with the first isolation protrusion.

[0008] The back contact cell of the utility model is provided with a first isolation protrusion and a second isolation protrusion, and in the thickness direction of the cell body, the height of at least one of the first isolation protrusion and the second isolation protrusion is greater than the height of all the grid lines. When the back contact cell is stacked, there is a gap between the grid lines and the surface of the adjacent cell body, and the grid lines will not contact the surface of the adjacent cell body, and the grid lines will not scratch the surface of the adjacent cell body, effectively reducing the possibility of scratching the surface of the cell body during the transfer process of the back contact cell. The second isolation protrusion is provided on the front of the cell body, and the first isolation protrusion is provided on the back of the cell body. The second isolation protrusion and the first isolation protrusion can achieve a double isolation effect, and more effectively avoid the grid lines from contacting the surface of the cell body. Moreover, multiple second isolation protrusions are projected on the back side of the battery cell body, and the projections have no intersection with the first isolation protrusions, or the projections partially intersect with the first isolation protrusions. The arrangement structure of the second isolation protrusions on the front side of the battery cell body is the same as the arrangement structure of the first isolation protrusions on the back side of the battery cell body. While ensuring the isolation effect, the amount of glue used can be reduced, and the number of second isolation protrusions set on the front side of the battery cell body can be reduced, thereby reducing the impact of the second isolation protrusions on light.

[0009] Optionally, a plurality of the second isolation protrusions are projected on the back of the battery cell body, and at least part of the projections of the second isolation protrusions are located in the gap between two adjacent first isolation protrusions. When stacking, after the isolation structures on the surfaces of adjacent stacked battery cells are butted, at least part of the first isolation of one cell limits at least part of the second isolation of another cell, thereby obtaining better support and achieving better anti-scratch effect.

[0010] Optionally, the end face of the first isolation protrusion facing away from the battery cell body is parallel to the battery cell body, and / or the end face of the second isolation protrusion facing away from the battery cell body is parallel to the battery cell body; a plurality of the second isolation protrusions are projected on the back of the battery cell body, and the projections partially intersect with the first isolation protrusions. The parallelism described in the present invention includes not only the conventional understanding of parallelism, but also approximate parallelism, because the isolation protrusion structure is usually a structure formed by organic matter, and its shrinkage surface after solidification is not necessarily an absolute plane, and may be a slightly undulating and approximate plane structure.

[0011] Optionally, the first isolation protrusion is a first long strip structure, or the plurality of the first isolation protrusions are arranged as a first long strip structure; the second isolation protrusion is a second long strip structure, or the plurality of the second isolation protrusions are arranged as a second long strip structure; the first long strip structure is arranged along a first direction, the second long strip structure is arranged along a second direction, and the first direction and the second direction intersect. The arrangement of the crossed long strip structures can achieve better support after the isolation structures on the surfaces of adjacent stacked battery cells are docked, thereby achieving a better anti-scratch effect; the long strip structure composed of isolation protrusions can bypass the grid lines or other structures according to actual conditions to avoid interference with the functional structure, while having the advantages of the long strip structure. The spacing between the isolation protrusions can be set according to actual conditions, such as being equal to or greater than the spacing between adjacent fine grids.

[0012] Optionally, at least one of the first isolation protrusion and the second isolation protrusion is a convex dot structure.

[0013] Optionally, the grid line is provided on the back side of the battery cell body; the first isolation protrusion is an insulating glue, the insulating glue is connected to a preset position of the grid line, and / or the insulating glue is located in a gap between two adjacent grid lines.

[0014] Optionally, the insulating glue includes a first insulating glue and a second insulating glue, the first insulating glue is connected to the back side of the battery cell body and covers the preset position of the gate line; the second insulating glue is connected to at least part of the first insulating glue, and the second insulating glue covers the surface of the first insulating glue away from the battery cell body.

[0015] Optionally, under normal temperature conditions, the first isolation protrusion and the second isolation protrusion are solid components; under high temperature conditions, the first isolation protrusion and / or the second isolation protrusion are pyrolyzed and vaporized; wherein the high temperature condition is at least one of a drying and curing process and a string welding process in the subsequent processing of the battery cell.

[0016] Optionally, at room temperature, the first isolation protrusion and the second isolation protrusion are solid components; in a lamination process in subsequent processing of the battery cell, the battery cell is encapsulated by an adhesive film, and the first isolation protrusion and / or the second isolation protrusion are cross-linked with the adhesive film.

[0017] In a second aspect, an embodiment of the utility model further provides a battery cell stacking structure, the battery cell stacking structure comprises a plurality of stacked battery cells, the front side of the battery cell contacts the back side of the adjacent battery cell, and the battery cell is as described above.

[0018] In a third aspect, an embodiment of the utility model further provides a solar cell assembly, wherein the solar cell assembly comprises the above-mentioned cell sheet.

[0019] Optionally, the solar cell assembly further includes a cover plate, a back plate, and an adhesive film, the cell sheet is encapsulated between the cover plate and the back plate by the adhesive film, and the first isolation protrusion and / or the second isolation protrusion are at least partially cross-linked with the adhesive film after a lamination process.

[0020] The utility model discloses a battery cell in which a plurality of battery cells are stacked during the transfer process, and the back of one battery cell contacts the front of another battery cell. Since the height of at least one of the first isolation protrusion and the second isolation protrusion is greater than the height of all grid lines in the thickness direction of the battery cell body, there is a gap between the grid line of one battery cell and the surface of another battery cell, and the grid line will not contact the surface of the adjacent battery cell body, and the grid line will not scratch the surface of the adjacent battery cell body, effectively reducing the possibility of surface scratches on the battery cell during the transfer process. Moreover, the second isolation protrusion is set on the front of the battery cell body, and the first isolation protrusion is set on the back of the battery cell body. Compared with setting the isolation protrusion only on the front or back of the battery cell body, the second isolation protrusion and the first isolation protrusion can achieve a double isolation effect, more effectively avoiding the grid line from contacting the surface of the battery cell body. Moreover, multiple second isolation protrusions are projected on the back side of the battery cell body, and the projections have no intersection with the first isolation protrusions, or the projections partially intersect with the first isolation protrusions, that is, the arrangement structure of the second isolation protrusions on the front side of the battery cell body is different from the arrangement structure of the first isolation protrusions on the back side of the battery cell body. Compared with the arrangement structure of the second isolation protrusions on the front side of the battery cell body and the arrangement structure of the first isolation protrusions on the back side of the battery cell body being the same, the battery cell of the embodiment of the present application can reduce the amount of glue used while ensuring the isolation effect, and reduce the number of second isolation protrusions set on the front side of the battery cell body, thereby reducing the impact of the second isolation protrusions on light.

[0021] The above description is only an overview of the technical solution of the utility model. In order to more clearly understand the technical means of the utility model, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for describing the embodiments are briefly introduced below.

[0023] Figure 1 This is a schematic diagram of the battery cell stacking structure according to the first embodiment of the present utility model;

[0024] Figure 2This is a schematic diagram of the structure of the battery cell according to the first embodiment of the utility model;

[0025] Figure 3 This is a schematic diagram of the structure of a battery cell according to a second embodiment of the present utility model;

[0026] Figure 4 This is a schematic diagram of the structure of a battery cell according to a third embodiment of the present utility model;

[0027] Figure 5 This is a schematic structural diagram of a battery cell according to a fourth embodiment of the present utility model;

[0028] Figure 6 This is a schematic diagram of the structure of a battery cell according to a fifth embodiment of the present utility model;

[0029] Figure 7 This is a schematic diagram of a battery cell stacking structure according to a second embodiment of the present utility model;

[0030] Figure 8 This is a schematic diagram of a battery cell stacking structure according to a third embodiment of the present utility model;

[0031] Fig. 9 This is a schematic diagram of the battery cell stacking structure described in the fourth embodiment of the present utility model.

[0032] Description of reference numerals:

[0033] 10 - battery cell body; 11 - back side of battery cell body; 12 - front side of battery cell body; 20 - first isolation protrusion; 21 - first insulating glue; 22 - second insulating glue; 30 - second isolation protrusion; 40 - grid line; 41 - preset position. DETAILED DESCRIPTION

[0034] The exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can also be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0035] The present application embodiment discloses a battery cell, referring to Figure 1 and Figure 5 , Figure 1 A schematic diagram of a battery stacking structure provided in an embodiment of the present application is shown. Figure 5The schematic diagram of the structure of the front and back sides of the battery cell provided by the embodiment of the present application is shown. The battery cell includes a plurality of first isolation protrusions 20, a plurality of second isolation protrusions 30, a plurality of grid lines 40 and a battery cell body 10; a plurality of first isolation protrusions 20 are arranged on the back side 11 of the battery cell body, and the first isolation protrusions 20 protrude from the back side 11 of the battery cell body; a plurality of second isolation protrusions 30 are arranged on the front side 12 of the battery cell body, and the second isolation protrusions 30 protrude from the front side 12 of the battery cell body; a plurality of grid lines 40 are arranged on at least one side of the battery cell body; in the thickness direction (i.e. Figure 1 In the Z direction), the height of at least one of the first isolation protrusion 20 and the second isolation protrusion 30 is greater than the height of all the gate lines 40; multiple second isolation protrusions 30 are projected on the back side 11 of the battery cell body, and the projections have no intersection with the first isolation protrusions 20, or the projections have a partial intersection with the first isolation protrusions 20.

[0036] Specifically, refer to Figure 5 As shown, the front side 12 of the battery cell body is a light receiving side, and a second isolation protrusion 30 is provided on the front side 12 of the battery cell body.

[0037] Reference Figure 5 As shown, the back side 11 of the battery cell body is the backlight side, and the back side 11 of the battery cell body is provided with a first isolation protrusion 20. Among them, there are many types of battery cells, and the grid lines 40 of different types of battery cells will be different. For example, the battery cell includes a main grid line and a fine grid line, and the height of the main grid line is higher than the height of the fine grid line; for example, the battery cell includes a main grid line and a fine grid line, and the height of the main grid line is lower than the height of the fine grid line; for another example, the battery cell includes a plurality of fine grid lines. In the embodiment of the present application, in the thickness direction of the battery cell body 10 (i.e. Figure 1 In the Z direction), the height of at least one of the first isolation protrusion 20 and the second isolation protrusion 30 is greater than the height of all the gate lines 40.

[0038] In the embodiment of the present application, the plurality of second isolation protrusions 30 are projected on the back surface 11 of the battery cell body. Figure 4 As shown, the projection has no intersection with the first isolation protrusion 20, or, referring to Figure 2 As shown, the projection partially intersects with the first isolation protrusion 20. That is, the second isolation protrusion 30 and the first isolation protrusion 20 are arranged in a staggered manner, not in a corresponding manner.

[0039] In the embodiment of the present application, the height of the second isolation protrusion 30 is the distance between the end of the second isolation protrusion 30 away from the battery cell body 10 and the front side 12 away from the battery cell body. The height of the first isolation protrusion 20 is the distance between the end of the first isolation protrusion 20 away from the battery cell body 10 and the back side 11 away from the battery cell body.

[0040] During the transfer process of the battery cell of the embodiment of the present application, multiple battery cells are stacked, and the back of one battery cell contacts the front of another battery cell. Since the height of at least one of the first isolation protrusion 20 and the second isolation protrusion 30 is greater than the height of all the grid lines 40 in the thickness direction of the battery cell body 10, there is a gap between the grid line 40 of one battery cell and the surface of another battery cell, and the grid line 40 will not contact the surface of the adjacent battery cell body 10, and the grid line 40 will not scratch the surface of the adjacent battery cell body 10, effectively reducing the possibility of scratching the surface of the battery cell body 10 during the transfer process. The second isolation protrusion 30 is set on the front side 12 of the battery cell body, and the first isolation protrusion 20 is set on the back side 11 of the battery cell body. Compared with setting the isolation protrusion only on the front side or the back side of the battery cell body, the second isolation protrusion 30 and the first isolation protrusion 20 can achieve a double isolation effect, and more effectively avoid the grid line 40 from contacting the surface of the battery cell body.

[0041] Moreover, multiple second isolation protrusions 30 are projected on the back side 11 of the battery cell body, and the projections have no intersection with the first isolation protrusions 20, or the projections partially intersect with the first isolation protrusions 20, that is, the arrangement structure of the second isolation protrusions 30 on the front side 12 of the battery cell body is different from the arrangement structure of the first isolation protrusions 20 on the back side 11 of the battery cell body. Compared with the arrangement structure of the second isolation protrusions 30 on the front side 12 of the battery cell body and the arrangement structure of the first isolation protrusions 20 on the back side 11 of the battery cell body being the same, the battery cell of the embodiment of the present application can reduce the amount of glue used while ensuring the isolation effect, and reduce the number of second isolation protrusions 30 set on the front side 12 of the battery cell body, thereby reducing the influence of the second isolation protrusions 30 on light.

[0042] In the embodiment of the present application, the plurality of second isolation protrusions 30 are projected on the back surface 11 of the battery cell body. Figure 1 , which shows a schematic diagram of a structure where the projection has no intersection with the first isolation protrusion 20. Figure 8 , which shows a schematic diagram of a structure in which the projection partially intersects with the first isolation protrusion 20 .

[0043] Furthermore, a first isolation protrusion 20 is provided on the back side 11 of the battery cell body, and a second isolation protrusion 30 is provided on the front side 12 of the battery cell body. Isolation protrusions are provided on both the front and back sides of the battery cell body. When stacking multiple battery cells during the transfer process, there is no need to consider the placement direction of two adjacent battery cells, which can reduce the difficulty of the stacking operation and avoid surface scratches on the battery cell body caused by changes in the stacking direction of the battery cells.

[0044] When multiple battery cells are stacked during the transfer process of the battery cells of the embodiment of the present application, due to the provision of the first isolation protrusion 20 and the second isolation protrusion 30, there is no need to provide isolation paper between two adjacent battery cells, thereby avoiding the technical problem of placing isolation paper on the battery cells and removing the isolation paper during subsequent component production, which both increase the production process and affect the production capacity; and avoiding the technical problem of large cost waste caused by discarding isolation paper.

[0045] Optionally, the embodiment of the present application does not specifically limit the manner in which the first isolation protrusion 20 and the second isolation protrusion 30 are disposed on the battery cell body 10. For example, the first isolation protrusion 20 and / or the second isolation protrusion 30 are printed on the surface of the battery cell body 10; for another example, the first isolation protrusion 20 and / or the second isolation protrusion 30 are disposed on the surface of the battery cell body 10 by inkjet.

[0046] Optional, see Figure 1 As shown, multiple second isolation protrusions 30 are projected on the back surface 11 of the battery cell body, and at least part of the projection of the second isolation protrusions 30 is located in the gap between two adjacent first isolation protrusions 20. At this time, when multiple battery cells are stacked, refer to Figure 1 As shown, the second isolation protrusion 30 of one battery cell is located in the gap between the two first isolation protrusions 20 of the adjacent battery cells. The two first isolation protrusions 20 can limit the sliding of the second isolation protrusion 30, thereby forming a stable connection between the multiple battery cells.

[0047] A certain stacking structure.

[0048] Further, see Figure 1 As shown, a plurality of second isolation protrusions 30 are projected on the back surface 11 of the battery cell body, the projections are located in the gap between two adjacent first isolation protrusions 20 , and the projections and the first isolation protrusions 20 are alternately arranged.

[0049] Optional, see Figure 8 As shown, multiple second isolation protrusions 30 are projected on the back side 11 of the battery cell body, and the projections partially intersect with the first isolation protrusions 20. At this time, when multiple battery cells are stacked, the first isolation protrusion 20 of one battery cell contacts the second isolation protrusion 30 of the adjacent battery cell, preventing the grid line 40 from contacting the surface of the battery cell and scratching the battery cell.

[0050] Optional, see Figure 7 As shown, the end face of the first isolation protrusion 20 facing away from the battery cell body 10 is parallel to the battery cell body 10, and / or the end face of the second isolation protrusion 30 facing away from the battery cell body 10 is parallel to the battery cell body 10; multiple second isolation protrusions 30 are projected on the back side 11 of the battery cell body, and the projections partially intersect with the first isolation protrusions 20.

[0051] In the embodiment of the present application, multiple second isolation protrusions 30 are projected on the back side 11 of the battery cell body. When the projection partially intersects with the first isolation protrusion 20, the multiple battery cells are stacked, and the first isolation protrusion 20 of one battery cell is in contact with the second isolation protrusion 30 of an adjacent battery cell. Moreover, since at least one of the end faces of the first isolation protrusion 20 facing away from the battery cell body 10 and the end faces of the second isolation protrusion 30 facing away from the battery cell body 10 is an end face parallel to the battery cell body 10, the first isolation protrusion 20 of one battery cell and the second isolation protrusion 30 of the adjacent battery cell will not slip when in contact, so that the multiple battery cells form a stable stacking structure.

[0052] Optional, see Figure 2 and Figure 3 As shown, the first isolation protrusion 20 is a first long strip structure, or a plurality of first isolation protrusions 20 are arranged as a first long strip structure; the second isolation protrusion 30 is a second long strip structure, or a plurality of second isolation protrusions 30 are arranged as a second long strip structure; the first long strip structure is arranged along the first direction, the second long strip structure is arranged along the second direction, and the first direction and the second direction intersect.

[0053] In the above structure of the present application, the plurality of second isolation protrusions 30 are projected on the back surface 11 of the battery cell body, and the projections have intersections with the first isolation protrusions 20 .

[0054] The first direction and the second direction are not specifically limited in the present embodiment. Figure 2 As shown, the first direction and the second direction are both inclined to the four sides of the battery sheet. Figure 3 As shown, the first direction is arranged parallel to a pair of sides of the battery cell, the second direction is arranged parallel to another pair of sides of the battery cell, and the first direction is perpendicular to the second direction.

[0055] Optional, see Figure 4 As shown, at least one of the first isolation protrusion 20 and the second isolation protrusion 30 is a convex dot structure. The above structure of the embodiment of the present application includes three situations: the first isolation protrusion 20 is a convex dot structure, and the second isolation protrusion 30 is a strip-shaped structure or other structures; the second isolation protrusion 30 is a convex dot structure, and the first isolation protrusion 20 is a strip-shaped structure or other structures; the first isolation protrusion 20 and the second isolation protrusion 30 are both convex dot structures.

[0056] Furthermore, the embodiment of the present application does not specifically limit the shape of the bump-shaped structure, as long as it meets the use requirements and manufacturing requirements. Figure 4 As shown, the convex point structure is a cube convex point. Figure 5 As shown in FIG. , the convex point structure is a spherical convex point. Figure 6 As shown, the convex point structure is a rectangular parallelepiped convex point.

[0057] Optionally, the positional relationship between the first isolation protrusion 20 and the gate line 40 can be set according to the use requirements, for example, referring to Figure 5 and Figure 6 As shown in FIG. 4 , the first isolation protrusion 20 is located between two adjacent gate lines 40. Figure 8 As shown, the first isolation protrusion 20 is connected to the gate line 40 .

[0058] Optionally, the back side 11 of the cell body is provided with a grid line 40, and the first isolation protrusion 20 is an insulating glue, referring to Figure 7 and Figure 8 As shown, the insulating glue is connected to the preset position 41 of the gate line 40 .

[0059] Among them, the battery cell in the embodiment of the present application can be a variety of types of battery cells, for example, the battery cell is a BC type battery cell (back contact battery cell), the back contact battery cell is a PN junction and a grid line 40 are arranged on the back of the solar cell, the grid line 40 is not arranged on the front of the battery cell, the front of the battery cell uses silicon nitride or silicon oxide as a passivation layer, the front of the battery cell is not blocked by a metal electrode, the incident light is used to the maximum extent, the optical loss is reduced, and more effective power generation area is brought; the back contact battery cell has a high conversion efficiency and is more beautiful in appearance. When the back contact battery cell is transported, it is necessary to stack a plurality of back contact battery cells. At this time, the front film layer of the back contact battery cell is easily scratched by the back grid line 40 of the adjacent back contact battery cell. Insulating glue is usually provided in the back contact battery cell, and the insulating glue is used to prevent a short circuit between two grid lines 40 of opposite polarity in the back 11 of the battery cell body. When the first isolation protrusion 20 is an insulating glue, it is not necessary to set the first isolation protrusion 20 separately, reducing the amount of glue and process steps, thereby saving production costs.

[0060] In the embodiment of the present application, the preset position of the gate line 40 is a position where two gate lines 40 with opposite polarities are prone to short circuit, for example, the preset position is an end of the gate line 40 .

[0061] Optionally, the back side 11 of the cell body is provided with a grid line 40, and the first isolation protrusion 20 is an insulating glue, referring to Figure 6 As shown, the insulating glue is located in the gap between two adjacent gate lines 40 . At this time, the insulating glue can be prevented from affecting the subsequent processing and use of the gate lines 40 .

[0062] Optionally, the back side 11 of the cell body is provided with a grid line 40, see Figure 8 As shown, the first isolation protrusion 20 is an insulating glue, which is connected to the preset position 41 of the gate line 40, and the insulating glue is located in the gap between two adjacent gate lines 40. The number of insulating glues is relatively large, and the insulating glue can effectively prevent the gate line 40 from contacting the surface of the adjacent battery cell, thereby preventing the surface of the adjacent battery cell from being scratched.

[0063] Optionally, the specific material of the insulating glue is set according to the use requirements. When the insulating glue is a glue that can block light, such as green glue, the insulating glue can only be set on the back side 11 of the battery cell body. When the insulating glue is a UV glue that has little effect on light, or has no effect on light, the insulating glue can also be set on the front side 12 of the battery cell body.

[0064] Optional, see Fig. 9 As shown, the insulating glue includes a first insulating glue 21 and a second insulating glue 22. The first insulating glue 21 is connected to the back side 11 of the battery cell body and covers the preset position 41 of the gate line 40; the second insulating glue 22 is connected to at least part of the first insulating glue 21, and the second insulating glue 22 covers the surface of the first insulating glue 21 away from the battery cell body 10.

[0065] In the above embodiment of the present application, the first insulating glue 21 is used to cover the preset position 41 of the grid line 40, and plays an insulating role to prevent the two grid lines 40 with opposite polarities in the battery cell from short-circuiting. After the second insulating glue 22 is connected to the first insulating glue 21, the second insulating glue 22 will be higher than all the grid lines 40, thereby preventing the grid lines 40 from scratching the front side 12 of the battery cell body.

[0066] Moreover, when the second insulating glue 22 is connected to part of the first insulating glue 21, the second insulating glue 22 is not connected to all the first insulating glue 21, which can reduce the amount of glue used, thereby saving costs. When the second insulating glue 22 is connected to all the first insulating glue 21, the amount of the second insulating glue 22 is relatively large, and the second insulating glue 22 can achieve a better isolation effect.

[0067] Optionally, at room temperature, the first isolation protrusion 20 and the second isolation protrusion 30 are solid components; at high temperature, the first isolation protrusion 20 and / or the second isolation protrusion 30 are pyrolyzed and vaporized; wherein the high temperature condition is at least one of the drying and curing process and the string welding process in the subsequent processing of the battery cell. In the above structure of the embodiment of the present application, the first isolation protrusion 20 and the second isolation protrusion 30 have a certain stability at room temperature, and the first isolation protrusion 20 and the second isolation protrusion 30 will not be in a molten flow state at room temperature. The first isolation protrusion 20 and the second isolation protrusion 30 can play an isolation role to prevent scratches on the surface of the battery cell body 10. In the subsequent processing of the battery cell, such as at least one of the drying and curing process and the string welding process, the battery cell will be in a high temperature condition; the first isolation protrusion 20 and the second isolation protrusion 30 are pyrolyzed and vaporized at high temperature, and the first isolation protrusion 20 and the second isolation protrusion 30 do not need to be removed separately, and the subsequent transfer and processing process of the battery cell is simpler, which can effectively reduce the manufacturing cost of the solar cell module. Moreover, the first isolation protrusion 20 and the second isolation protrusion 30 have no effect on the appearance of the solar cell assembly made by processing the cell sheet, and the existence of the first isolation protrusion 20 and the second isolation protrusion 30 cannot be detected under a strong flashlight or EL test.

[0068] Optionally, the embodiment of the present application does not specifically limit the normal temperature, for example, the normal temperature is less than or equal to 70°C.

[0069] The embodiment of the present application does not specifically limit the materials of the first isolation protrusion 20 and the second isolation protrusion 30. For example, the first isolation protrusion 20 and the second isolation protrusion 30 are polyvinyl alcohol PVA films. PVA is a colorless to light yellow crystalline polymer material, which is polymerized from vinyl alcohol monomers. The melting point of PVA is about 100°C and the boiling point is about 180°C. The PVA film is solid at room temperature; after the component end is coated with insulating glue and / or gray glue, there is a drying and curing stage at the component end, and the drying and curing temperature is 180°C-340°C. At this stage, the PVA film will be pyrolyzed, and the first isolation protrusion 20 and the second isolation protrusion 30 will be pyrolyzed without removal. Moreover, PVA is a water-soluble polymer compound, and the front coating of the battery cell body 10, such as silicon nitride and silicon oxide, is an inorganic compound. The chemical properties and structures of PVA and the coating are very different, and no direct chemical reaction will occur. Therefore, PVA will not affect the front coating of the battery cell body 10.

[0070] Optionally, at room temperature, the first isolation protrusion 20 and the second isolation protrusion 30 are solid components; in the lamination process of the subsequent processing of the battery cell, the battery cell is encapsulated by the adhesive film, and the first isolation protrusion 20 and / or the second isolation protrusion 30 are cross-linked with the adhesive film. At this time, the first isolation protrusion 20 and the second isolation protrusion 30 have a certain stability at room temperature, and the first isolation protrusion 20 and the second isolation protrusion 30 will not be in a molten flow state at room temperature. The first isolation protrusion 20 and the second isolation protrusion 30 can play an isolation role to prevent scratches on the surface of the battery cell body 10. In the lamination process of the subsequent processing of the battery cell, the first isolation protrusion 20 and the second isolation protrusion 30 will melt and cross-link with the adhesive film; therefore, the first isolation protrusion 20 and the second isolation protrusion 30 do not need to be removed separately, and the subsequent transfer and processing of the battery cell is simpler, which can effectively reduce the manufacturing cost of the solar cell module. Moreover, the first isolation protrusion 20 and the second isolation protrusion 30 have no effect on the appearance of the solar cell assembly made by processing the cell sheet, and the existence of the first isolation protrusion 20 and the second isolation protrusion 30 cannot be detected under a strong flashlight or EL test.

[0071] It is understandable that the material of the first isolation protrusion 20 and the second isolation protrusion 30 can be selected according to the use requirements, for example, at least one of polyvinyl alcohol, ethylene-vinyl acetate copolymer, and polyolefin elastomer can be selected.

[0072] During the transfer process of the battery cell of the embodiment of the present application, multiple battery cells are stacked, and the back of one battery cell contacts the front of another battery cell. Since the height of at least one of the first isolation protrusion 20 and the second isolation protrusion 30 is greater than the height of all the grid lines 40 in the thickness direction of the battery cell body 10, there is a gap between the grid line 40 of one battery cell and the surface of another battery cell, and the grid line 40 will not contact the surface of the adjacent battery cell body, and the grid line 40 will not scratch the surface of the adjacent battery cell body, effectively reducing the possibility of scratches on the surface of the battery cell body 10 during the transfer process. The second isolation protrusion 30 is set on the front side 12 of the battery cell body, and the first isolation protrusion 20 is set on the back side 11 of the battery cell body. Compared with setting the isolation protrusion only on the front side or the back side of the battery cell body, the second isolation protrusion 30 and the first isolation protrusion 20 can achieve a double isolation effect, and more effectively avoid the grid line 40 from contacting the surface of the battery cell body 10. Moreover, the arrangement structure of the second isolation protrusion 30 on the front side 12 of the battery cell body is different from the arrangement structure of the first isolation protrusion 20 on the back side 11 of the battery cell body. Compared with the arrangement structure of the second isolation protrusion 30 on the front side 12 of the battery cell body and the arrangement structure of the first isolation protrusion 20 on the back side 11 of the battery cell body being the same, the battery cell of the embodiment of the present application can reduce the amount of glue used while ensuring the isolation effect, and reduce the number of second isolation protrusions 30 set on the front side 12 of the battery cell body, thereby reducing the impact of the second isolation protrusion 30 on light.

[0073] The present application also discloses a battery stacking structure. Figure 1 As shown, the battery cell stacking structure includes a plurality of battery cells stacked and placed, the front side of the battery cell contacts the back side of the adjacent battery cell, and the battery cell is the battery cell mentioned above.

[0074] The battery stacking structure of this application refers to Figure 1 As shown, since the height of the first isolation protrusion 20 and the height of the second isolation protrusion 30 in the thickness direction of the battery cell body 10 are both greater than the height of all the grid lines 40, there is a gap between the grid line 40 of one battery cell and the surface of another battery cell, and the grid line 40 will not contact the surface of the adjacent battery cell body 10, and the grid line 40 will not scratch the surface of the adjacent battery cell body 10, effectively reducing the possibility of scratches on the surface of the battery cell in the battery cell stacking structure. In addition, the second isolation protrusion 30 is set on the front side 12 of the battery cell body, and the first isolation protrusion 20 is set on the back side 11 of the battery cell body. Compared with setting the isolation protrusion only on the front side or the back side of the battery cell body, the second isolation protrusion 30 and the first isolation protrusion 20 can achieve a double isolation effect, which more effectively avoids the grid line 40 from contacting the surface of the battery cell body.

[0075] The embodiment of the present application also discloses a solar cell assembly, which includes the above-mentioned cell sheet.

[0076] In the embodiment of the present application, the solar cell assembly uses the above-mentioned cell sheets. During the transfer process of the above-mentioned cell sheets, when multiple cell sheets are stacked, there is a gap between the grid line 40 of one cell sheet and the surface of another cell sheet, and the grid line 40 will not contact the surface of the adjacent cell sheet body 10, and the grid line 40 will not scratch the surface of the adjacent cell sheet body 10; the second isolation protrusion 30 and the first isolation protrusion 20 can achieve a double isolation effect, effectively reducing the possibility of surface scratches on the cell sheets in the cell stacking structure, and avoiding surface scratches on the cell sheets during the transfer process (scratches on the surface of the cell sheet body 10, especially the front side 12 of the cell sheet body, are prone to produce adverse consequences such as poor EL and reduced efficiency), thereby achieving the purpose of improving the appearance quality of the solar cell assembly and increasing the efficiency of the solar cell assembly.

[0077] Moreover, multiple second isolation protrusions 30 are projected on the back side 11 of the battery cell body, and the projections have no intersection with the first isolation protrusions 20, or the projections partially intersect with the first isolation protrusions 20. That is, the arrangement structure of the second isolation protrusions 30 on the front side 12 of the battery cell body is different from the arrangement structure of the first isolation protrusions 20 on the back side 11 of the battery cell body. Compared with the arrangement structure of the second isolation protrusions 30 on the front side 12 of the battery cell body and the arrangement structure of the first isolation protrusions 20 on the back side 11 of the battery cell body being the same, the amount of glue used can be reduced while ensuring the isolation effect, thereby reducing the cost of solar cell modules.

[0078] Optionally, the solar cell assembly further includes a cover plate, a back plate, and an adhesive film. The cell is encapsulated between the cover plate and the back plate by the adhesive film, and the first isolation protrusion 20 and / or the second isolation protrusion 30 are at least partially cross-linked with the adhesive film after the lamination process. After the cell is encapsulated by the adhesive film, at least part of the first isolation protrusion 20 and / or the second isolation protrusion 30 will melt and cross-link with the adhesive film. The first isolation protrusion 20 and / or the second isolation protrusion 30 have no effect on the appearance of the solar cell assembly made by processing the cell. The existence of the first isolation protrusion 20 and the second isolation protrusion 30 cannot be detected under a strong light flashlight and EL test, and thus will not affect the efficiency of the solar cell assembly.

[0079] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0080] Each embodiment in this specification is described in a related manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. For the embodiments of the device, electronic device, computer-readable storage medium and computer program products containing instructions, since they are basically similar to the method embodiments, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiments.

[0081] The above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.

Claims

1. A battery cell, characterized in that: The battery cell comprises a plurality of first isolation protrusions (20), a plurality of second isolation protrusions (30), a plurality of grid lines (40) and a battery cell body (10); A plurality of the first isolation protrusions (20) are arranged on the back side (11) of the battery cell body, and the first isolation protrusions (20) protrude from the back side (11) of the battery cell body; A plurality of the second isolation protrusions (30) are arranged on the front side (12) of the battery cell body, and the second isolation protrusions (30) protrude from the front side (12) of the battery cell body; A plurality of the grid lines (40) are arranged on at least one side of the battery cell body; in the thickness direction of the battery cell body (10), the height of at least one of the first isolation protrusion (20) and the second isolation protrusion (30) is greater than the height of all the grid lines (40); a plurality of the second isolation protrusions (30) are projected onto the back side (11) of the battery cell body, and the projections have no intersection with the first isolation protrusions (20), or the projections have a partial intersection with the first isolation protrusions (20).

2. The battery cell according to claim 1, characterized in that: A plurality of the second isolation protrusions (30) are projected onto the back side (11) of the battery cell body, and the projections of at least some of the second isolation protrusions (30) are located within the gap between two adjacent first isolation protrusions (20).

3. The battery cell according to claim 1, characterized in that: The end face of the first isolation protrusion (20) facing away from the battery cell body (10) is parallel to the battery cell body (10), and / or the end face of the second isolation protrusion (30) facing away from the battery cell body (10) is parallel to the battery cell body (10); a plurality of the second isolation protrusions (30) are projected onto the back side (11) of the battery cell body, and the projections partially intersect with the first isolation protrusions (20).

4. The battery cell according to claim 1, characterized in that: The first isolation protrusion (20) is a first long strip structure, or the plurality of first isolation protrusions (20) are arranged in a first long strip structure; The second isolation protrusion (30) is a second long strip structure, or the plurality of second isolation protrusions (30) are arranged in a second long strip structure; The first long strip structure is arranged along a first direction, the second long strip structure is arranged along a second direction, and the first direction and the second direction intersect.

5. The battery cell according to claim 1, characterized in that: At least one of the first isolation protrusion (20) and the second isolation protrusion (30) is a convex point structure.

6. The battery cell according to claim 1, characterized in that: The back side (11) of the battery cell body is provided with the gate line (40); the first isolation protrusion (20) is an insulating glue, the insulating glue is connected to a preset position (41) of the gate line (40), and / or the insulating glue is located in a gap between two adjacent gate lines (40).

7. The battery cell according to claim 6, characterized in that: The insulating glue comprises a first insulating glue (21) and a second insulating glue (22), wherein the first insulating glue (21) is connected to the back side (11) of the battery cell body and covers a preset position (41) of the gate line (40); and the second insulating glue (22) is connected to at least a portion of the first insulating glue (21), and the second insulating glue (22) covers a surface of the first insulating glue (21) that is away from the battery cell body (10).

8. A battery cell stacking structure, characterized in that: It comprises a plurality of stacked battery cells, the front side of each battery cell contacts the back side of an adjacent battery cell, and each battery cell is a battery cell as claimed in any one of claims 1 to 7.

9. A solar cell module, characterized in that: The solar cell assembly comprises the cell sheet according to any one of claims 1 to 7.

10. The solar cell assembly according to claim 9, characterized in that: The solar cell assembly further comprises a cover plate, a back plate and an adhesive film, the cell sheet is encapsulated between the cover plate and the back plate by the adhesive film, and the first isolation protrusion (20) and / or the second isolation protrusion (30) are at least partially cross-linked with the adhesive film after a lamination process.

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