A back contact cell, cell assembly and photovoltaic system

Abstract

The utility model discloses a kind of back contact battery, battery assembly and photovoltaic system, back contact battery includes: substrate, the back of substrate is provided with multiple first fine grid and multiple second fine grid, multiple first fine grid and multiple second fine grid are alternately arranged along first direction setting;Multiple groups of two first fine grid adjacent edges of adjacent along second direction enclose multiple first stringing area, multiple groups of two second fine grid adjacent edges of adjacent along second direction enclose multiple second stringing area, multiple first stringing area and multiple second stringing area are alternately arranged along second direction;Multiple first fine grid is through second stringing area, multiple second fine grid is through first stringing area;The back of substrate is divided into edge region and central region;The external contour shape of at least part first stringing area in edge region, with the external contour shape of the first stringing area in central region, is different.The utility model improves the performance of back contact battery.

Description

Technical Field

[0001] This utility model relates to the field of photovoltaic technology, and in particular to a back contact battery, battery module and photovoltaic system. Background Technology

[0002] Solar cells, as efficient and clean energy conversion devices, are widely used in various photovoltaic power generation systems. A solar cell consists of a silicon substrate and electrodes disposed on the silicon substrate. The electrodes and the silicon substrate are in ohmic contact, responsible for effectively collecting electrons and holes (charge carriers) generated by the silicon material under sunlight, and then converting them into usable electrical energy.

[0003] In existing technologies, the spacing between two adjacent grids on the same horizontal line in back-contact solar cells is the same, resulting in poor performance of back-contact solar cells. Utility Model Content

[0004] This invention provides a back contact battery, a battery module, and a photovoltaic system to improve the performance of the back contact battery.

[0005] According to one aspect of the present invention, a back contact battery is provided, the back contact battery comprising:

[0006] A substrate has multiple first fine grids and multiple second fine grids arranged alternately along a first direction on its back side. Multiple sets of adjacent edges of two adjacent first fine grids along a second direction form multiple first serial connection areas, and multiple sets of adjacent edges of two adjacent second fine grids along the second direction form multiple second serial connection areas. These multiple first and second serial connection areas are arranged alternately along the second direction. Multiple first fine grids penetrate the second serial connection areas, and multiple second fine grids penetrate the first serial connection areas. The first and second directions intersect each other.

[0007] The back side of the substrate is divided into an edge region and a central region; the outer contour shape of at least part of the first serialization area in the edge region is different from the outer contour shape of the first serialization area in the central region; wherein, the edge region is the area formed by a predetermined number of first fine gates near the edge of the substrate, and the central region is the area between the two edge regions.

[0008] Furthermore, the outer contour shape of at least a portion of the second concatenation area in the edge region is different from the outer contour shape of the second concatenation area in the central region.

[0009] Furthermore, the outer contour shape of each first connecting area in the edge region is different from the outer contour shape of the first connecting area in the central region.

[0010] Furthermore, the outer contour shape of each second connecting area in the edge region is different from the outer contour shape of the second connecting area in the central region.

[0011] Furthermore, along the direction from the central region to the edge region, the outer contour shape of the first connecting area in the edge region includes a trapezoid.

[0012] Furthermore, along the direction from the central region to the edge region, the outer contour shape of the first connecting area in the edge region includes an inverted trapezoid.

[0013] Furthermore, the outer contour shape of the first serialization area in the edge region includes a rectangle, and the distance between two adjacent first fine gates in the edge region along the second direction is greater than the distance between two adjacent first fine gates in the center region along the second direction.

[0014] Furthermore, in the edge region, the distance between two adjacent first fine grids on both sides of the first serialization area along the second direction gradually increases and then gradually decreases along the first direction.

[0015] Furthermore, along the direction from the central region to the edge region, the outer contour shape of the second concatenation area in the edge region includes a trapezoid.

[0016] Furthermore, along the direction from the central region to the edge region, the outer contour shape of the second concatenation area in the edge region includes an inverted trapezoid.

[0017] Furthermore, the outer contour shape of the second serialization area in the edge region includes a rectangle, and the distance between two adjacent second fine gates in the edge region along the second direction is greater than the distance between two adjacent second fine gates in the center region along the second direction.

[0018] Furthermore, in the edge region, the distance between two adjacent second fine gates on both sides of the second serial area along the second direction gradually increases and then gradually decreases along the first direction.

[0019] Furthermore, the preset quantity is less than or equal to 10.

[0020] Furthermore, in the edge region, a first insulating adhesive is provided on the side of the first fine grid on both sides of the first serial connection area away from the substrate, and along the second direction, the length of the first insulating adhesive located between the two serial connection areas is less than or equal to half the length of the first fine grid located between the two serial connection areas.

[0021] The contour shape formed by the adjacent edges of the multiple first insulating adhesives on both sides of the first serial connection area in the edge region is different from the contour shape formed by the adjacent edges of the multiple first insulating adhesives on both sides of the first serial connection area in the central region.

[0022] Furthermore, in the edge region, a second insulating adhesive is provided on the side of the second fine grid on both sides of the second serial connection area away from the substrate, and along the second direction, the length of the second insulating adhesive located between the two serial connection areas is less than or equal to half the length of the second fine grid located between the two serial connection areas.

[0023] The contour shape formed by the adjacent edges of the multiple second insulating adhesives on both sides of the second serial connection area in the edge region is different from the contour shape formed by the adjacent edges of the multiple second insulating adhesives on both sides of the second serial connection area in the central region.

[0024] Furthermore, along the direction from the central region to the edge region, the contour shape formed by the adjacent edges of the multiple first insulating adhesives on both sides of the first serial connection area in the edge region includes a figure-eight shape.

[0025] Furthermore, along the direction from the central region to the edge region, the contour shape formed by the adjacent edges of the multiple first insulating adhesives on both sides of the first serial connection area in the edge region includes an inverted V-shape.

[0026] Furthermore, in the edge region, the distance between adjacent edges of two adjacent first insulating adhesives along the second direction on both sides of the first serial connection area is equal, and the distance between adjacent edges of two adjacent first insulating adhesives along the second direction in the edge region is greater than the distance between adjacent edges of two adjacent first insulating adhesives along the second direction in the central region.

[0027] Furthermore, in the edge region, the distance between two adjacent first insulating adhesives on both sides of the first serial connection area along the second direction gradually increases and then gradually decreases along the first direction.

[0028] Furthermore, along the direction from the central region to the edge region, the contour shape formed by the adjacent edges of multiple second insulating adhesives on both sides of the second serial connection area in the edge region includes a figure-eight shape.

[0029] Furthermore, along the direction from the central region to the edge region, the contour shape formed by the adjacent edges of multiple second insulating adhesives on both sides of the second serial connection area in the edge region includes an inverted V-shape.

[0030] Furthermore, in the edge region, the distance between adjacent edges of two adjacent second insulating adhesives along the second direction on both sides of the second serial connection area is equal, and the distance between adjacent edges of two adjacent second insulating adhesives along the second direction in the edge region is greater than the distance between adjacent edges of two adjacent second insulating adhesives along the second direction in the central region.

[0031] Furthermore, in the edge region, the distance between two adjacent second insulating adhesives on both sides of the second serial connection area along the second direction gradually increases and then gradually decreases along the first direction.

[0032] According to another aspect of the present invention, a battery assembly is provided, the battery assembly including the back contact battery described in any of the above embodiments.

[0033] According to another aspect of the present invention, a photovoltaic system is provided, which includes the battery module described in the above embodiments.

[0034] The back contact battery provided in this embodiment of the utility model divides the back of the substrate into an edge region and a central region, and sets the outer contour shape of at least part of the first series connection area in the edge region to be different from the outer contour shape of the first series connection area in the central region. The outer contour shape of the first series connection area can be set according to the actual situation to improve the electron collection capability of the edge region and / or enhance the connection degree between the second grid and the solder strip, thereby improving the performance of the back contact battery.

[0035] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of this utility model, nor is it intended to limit the scope of this utility model. Other features of this utility model will become readily apparent from the following description. Attached Figure Description

[0036] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0037] Figure 1 This is a partial structural schematic diagram of a back contact battery according to an embodiment of the present utility model;

[0038] Figure 2 This is a schematic diagram of the region division of a substrate according to an embodiment of the present utility model;

[0039] Figure 3 This is a partial structural schematic diagram of another back contact battery provided according to an embodiment of the present utility model;

[0040] Figure 4 This is a partial structural schematic diagram of another back contact battery provided according to an embodiment of the present utility model;

[0041] Figure 5 This is a partial structural schematic diagram of another back contact battery provided according to an embodiment of the present utility model;

[0042] Figure 6 This is a partial structural diagram of a back contact battery including insulating adhesive according to an embodiment of the present utility model;

[0043] Figure 7 This is a partial structural diagram of another back contact battery including insulating adhesive according to an embodiment of the present utility model;

[0044] Figure 8 This is a partial structural diagram of a back contact battery including insulating adhesive according to an embodiment of the present utility model;

[0045] Figure 9 This is a partial structural diagram of a back contact battery including insulating adhesive according to an embodiment of the present invention. Detailed Implementation

[0046] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0047] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the utility model described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0048] This embodiment of the invention provides a back contact battery. Figure 1 This is a partial structural diagram of a back contact battery according to an embodiment of the present utility model. Figure 2 This is a schematic diagram of the region division of a substrate according to an embodiment of the present utility model, with reference to... Figure 1 and Figure 2 The back contact battery includes:

[0049] A substrate 1 has multiple first fine grids 2 and multiple second fine grids 3 disposed on its back side. The multiple first fine grids 2 and multiple second fine grids 3 are arranged alternately along a first direction X. Multiple sets of adjacent edges of two adjacent first fine grids 2 along a second direction Y form multiple first serial connection areas 21, and multiple sets of adjacent edges of two adjacent second fine grids 3 along the second direction Y form multiple second serial connection areas 31. The multiple first serial connection areas 21 and multiple second serial connection areas 31 are arranged alternately along the second direction Y. Multiple first fine grids 2 penetrate through the second serial connection areas 21, and multiple second fine grids 3 penetrate through the first serial connection areas 21. The first direction X and the second direction Y intersect each other.

[0050] The back side of the substrate 1 is divided into an edge region 4 and a central region 5; the outer contour shape of at least part of the first interconnection area 21 in the edge region 4 is different from the outer contour shape of the first interconnection area 21 in the central region 5; wherein, the edge region 4 is a region formed by a predetermined number of first fine gates 2 near the edge of the substrate, and the central region 5 is the region between the two edge regions 4.

[0051] The term "multiple" can be understood as two or more. Two or more first series connection areas 21 and two or more second series connection areas 31 are used to set the positive electrode solder strip and the negative electrode solder strip, respectively. For example, the first series connection area 21 is used to set the positive electrode solder strip, and the second series connection area 31 is used to set the negative electrode solder strip, or the first series connection area 21 is used to set the negative electrode solder strip, and the second series connection area 31 is used to set the positive electrode solder strip. The term "multiple groups" can be understood as two or more groups. For example, two or more groups of adjacent edges of two adjacent first fine grids 2 along the second direction Y form multiple first series connection areas 21, and two or more groups of adjacent edges of two adjacent second fine grids 3 along the second direction Y form multiple second series connection areas 31. The fact that multiple first fine gates 2 penetrate the second serial connection area 21 and multiple second fine gates 3 penetrate the first serial connection area 21 can be understood as multiple first fine gates 2 and multiple second fine gates 3 being intersected with the first serial connection area 21 and the second serial connection area 31. That is, the first serial connection area 21 and the second serial connection area 31 both extend along the first direction X to intersect with the first gate line 20 and the second gate line 30.

[0052] Specifically, along the first direction X, a first edge region 41, a central region 5, and a second edge region 42 can be sequentially divided on the back side of the substrate 1, with the central region 5 positioned between the first edge region 41 and the second edge region 42. The edge region 4 includes the first edge region 41 and the second edge region 42. At least a portion of the outer contour shape of the first connecting area 21 in the edge region 4 differs from the outer contour shape of the first connecting area 21 in the central region 5. This can be understood as the outer contour shape of each first connecting area 21 in the edge region 4 being different from the outer contour shape of the first connecting area 21 in the central region 5. Alternatively, it can be understood that the outer contour shape of some first connecting areas 21 in the edge region 4 is the same as the outer contour shape of the first connecting area 21 in the central region 5, and the outer contour shape of some first connecting areas 21 in the edge region 4 is different from the outer contour shape of the first connecting area 21 in the central region 5. For example, the outer contour shape of the first connecting area 21 can be trapezoidal, inverted trapezoidal, rectangular, bracket-shaped, etc., and this embodiment of the invention does not impose any limitations on this.

[0053] The back contact battery provided in this embodiment of the utility model divides the back side of the substrate 1 into an edge region 4 and a central region 5, and sets the outer contour shape of at least part of the first series connection area 21 in the edge region 4 to be different from the outer contour shape of the first series connection area 21 in the central region 5. The outer contour shape of the first series connection area 21 can be set according to the actual situation to improve the electron collection capability of the edge region 4 and / or enhance the connection degree between the second fine grid 3 and the solder strip, thereby improving the performance of the back contact battery.

[0054] Further reference Figure 1 The outer contour shape of at least part of the second connecting area 31 in the edge region 4 is different from the outer contour shape of the second connecting area 31 in the center region 5.

[0055] Specifically, the outer contour shape of at least a portion of the second series connection areas 31 in the edge region 4 is different from the outer contour shape of the second series connection areas 31 in the central region 5. This can be understood as the outer contour shape of each second series connection area 31 in the edge region 4 being different from the outer contour shape of the second series connection area 31 in the central region 5. Alternatively, it can be understood as the outer contour shape of a portion of the second series connection areas 31 in the edge region 4 being the same as the outer contour shape of the second series connection area 31 in the central region 5, and the outer contour shape of a portion of the second series connection areas 31 in the edge region 4 being different from the outer contour shape of the second series connection area 31 in the central region 5. For example, the outer contour shape of the second series connection area 31 can be trapezoidal, inverted trapezoidal, rectangular, bracket-shaped, etc., and this embodiment of the present invention does not limit this. Based on changing the outer contour shape of the first series connection area 21, the outer contour shape of the second series connection area 31 is set according to the actual situation, further improving the electron collection capability of the edge region 4 and / or enhancing the connection degree between the second fine grid 3 and the solder strip, thereby further improving the performance of the back contact battery.

[0056] Further reference Figure 1 The outer contour shape of each first connecting area 21 in the edge region 4 is different from the outer contour shape of the first connecting area 21 in the center region 5.

[0057] Specifically, by changing the outer contour shape of each first series connection area 21 in the edge region 4, the electron collection capability of each first series connection area 21 in the edge region 4 can be further improved and / or the connection degree between the first fine grid 2 and the solder strip can be enhanced, thereby further improving the performance of the back contact battery.

[0058] Further reference Figure 1 The outer contour shape of each second connecting area 31 in the edge region 4 is different from the outer contour shape of the second connecting area 31 in the center region 5.

[0059] Specifically, by changing the outer contour shape of each second series connection area 31 in the edge region 4, the electron collection capability of the edge region 4 and / or the connection degree between the second fine grid 3 and the solder strip can be further improved according to the actual situation, thereby further improving the performance of the back contact battery.

[0060] Further reference Figure 1 Along the direction from the central region 5 to the edge region 4, the outer contour shape of the first connecting area 21 in the edge region 4 includes a trapezoid.

[0061] Specifically, along the direction from the central region 5 to the edge region 4, the outer contour shape of the first serial connection area 21 in the edge region 4 is set to a trapezoid. This can reduce the risk of poor soldering at the edge of the solder strip due to edge solder strip offset, thereby reducing the risk of edge leakage caused by poor soldering at the edge of the solder strip.

[0062] Furthermore, Figure 3 This is a partial structural schematic diagram of a back contact battery according to an embodiment of the present utility model, with reference to... Figure 1 and Figure 3 Along the direction from the central region 5 to the edge region 4, the outer contour shape of the first connecting area 21 in the edge region 4 includes an inverted trapezoid.

[0063] Specifically, along the direction from the central region 5 to the edge region 4, the outer contour shape of the first serial connection area 21 in the edge region 4 is set to include an inverted trapezoid, which increases the length of the first fine gate 2 in the edge region 4, thereby enhancing the electron collection capability of the first fine gate 2 in the edge region 4.

[0064] Furthermore, Figure 4 This is a partial structural schematic diagram of another back contact battery according to an embodiment of the present utility model, with reference to... Figure 1 and Figure 4 The outer contour shape of the first connecting area 21 in the edge region 4 includes a rectangle, and the distance between two adjacent first fine gates 2 along the second direction X in the edge region 4 is greater than the distance between two adjacent first fine gates 2 along the second direction X in the center region 5.

[0065] Specifically, the outer contour shape of the first serial connection area 21 in the edge region 4 is set to be rectangular, and the distance between two adjacent first fine gates 2 along the second direction X in the edge region 4 is greater than the distance between two adjacent first fine gates 2 along the second direction X in the central region 5. This can prevent the occurrence of loose solder joints in the edge region 4 due to the thicker insulating adhesive on the first fine gates 2. For example, the distance between two adjacent first fine gates 2 along the second direction X in the edge region 4 can also be set to be equal to the distance between two adjacent first fine gates 2 along the second direction X in the central region 5. This can increase the electron collection capability of the first fine gates 2 in the edge region 4 while avoiding loose solder joints.

[0066] Furthermore, Figure 5 This is a partial structural schematic diagram of another back contact battery according to an embodiment of the present invention, with reference to... Figure 1 and Figure 5 In the edge region 4, the distance between two adjacent first fine grids 2 on both sides of the first serial connection area 21 along the second direction X gradually increases and then gradually decreases along the first direction Y.

[0067] Specifically, in the edge region 4, the distance between two adjacent first fine grids 2 on both sides of the first series connection area 21 along the second direction X is set to gradually increase and then gradually decrease along the first direction Y. Since the middle area of ​​the first series connection area 21 is wider, the connection between the solder ribbon and the grid line is increased, avoiding the situation of loose solder ribbon connection. At the same time, since the two sides of the first series connection area 21 are narrower, the electron collection capability of the first fine grid 2 in the edge region 4 is enhanced, improving the performance of the back contact battery.

[0068] Further reference Figure 1 Along the direction from the central region 5 to the edge region 4, the outer contour shape of the second connecting area 31 in the edge region 4 includes a trapezoid.

[0069] Specifically, along the direction from the central region 5 to the edge region 4, the outer contour shape of the second serial connection area 31 in the edge region 4 is set to include a trapezoid. This can reduce the risk of poor soldering at the edge of the solder strip due to edge solder strip offset, thereby reducing the risk of edge leakage caused by poor soldering at the edge of the solder strip.

[0070] Further reference Figure 1 and Figure 3 Along the direction from the central region 5 to the edge region 4, the outer contour shape of the second connecting area 31 in the edge region 4 includes an inverted trapezoid.

[0071] Specifically, along the direction from the central region 5 to the edge region 4, the outer contour shape of the second serial connection area 31 in the edge region 4 is set to include an inverted trapezoid, which increases the length of the second fine gate 3 in the edge region 4, thereby enhancing the electron collection capability of the second fine gate 3 in the edge region 4.

[0072] Further reference Figure 1 and Figure 4 The outer contour shape of the second serial connection area 31 in the edge region 4 includes a rectangle, and the distance between two adjacent second fine gates 3 along the second direction X in the edge region 4 is greater than the distance between two adjacent second fine gates 3 along the second direction X in the center region 5.

[0073] Specifically, by setting the outer contour shape of the second serial connection area 31 in the edge region 4 to be rectangular, and by making the distance between two adjacent second fine gates 3 along the second direction X in the edge region 4 greater than the distance between two adjacent second fine gates 3 along the second direction X in the central region 5, it is possible to prevent the solder ribbon from becoming loose due to the thicker insulating adhesive on the second fine gates 3. For example, if the distance between two adjacent second fine gates 3 along the second direction X in the edge region 4 is equal to the distance between two adjacent second fine gates 3 along the second direction X in the central region 5, the electron collection capability of the second fine gates 3 in the edge region 4 can be increased while avoiding loose solder ribbon connections.

[0074] Further reference Figure 1 and Figure 5 In the edge region 4, the distance between two adjacent second fine grids 3 on both sides of the second serial connection area 31 along the second direction X gradually increases and then gradually decreases along the first direction Y.

[0075] Specifically, in the edge region 4, the distance between two adjacent second fine grids 3 on both sides of the second series connection area 31 along the second direction X is set to gradually increase and then gradually decrease along the first direction Y. Since the middle area of ​​the second series connection area 31 is wider, the connection between the solder ribbon and the grid line is increased, avoiding the situation of loose solder ribbon connection. At the same time, since the two sides of the second series connection area 31 are narrower, the electron collection capability of the second fine grid 3 in the edge region 4 is enhanced, improving the performance of the back contact battery.

[0076] Furthermore, the preset quantity is less than or equal to 10.

[0077] Furthermore, Figure 6 This is a partial structural diagram of a back contact battery including insulating adhesive according to an embodiment of the present invention, for reference. Figure 6 In the edge region 4, a first insulating adhesive 61 is provided on the side of the first fine grid 2 on both sides of the first serial connection area 21 away from the substrate 1, and along the second direction Y, the length of the first insulating adhesive 61 located between the two serial connection areas is less than or equal to half the length of the first fine grid 2 located between the two serial connection areas.

[0078] The contour shape formed by the adjacent edges of the multiple first insulating adhesives 61 on both sides of the first serial connection area 21 in the edge region 4 is different from the contour shape formed by the adjacent edges of the multiple first insulating adhesives 61 on both sides of the first serial connection area 21 in the center region 5.

[0079] In this context, "multiple" can be understood as two or more. For example, the contour shape formed by the adjacent edges of two or more first insulating adhesives 61 on both sides of the first serial connection area 21 in the edge region 4 is different from the contour shape formed by the adjacent edges of two or more first insulating adhesives 61 on both sides of the first serial connection area 21 in the central region 5.

[0080] Specifically, the outline shape formed by the adjacent edges of the plurality of first insulating adhesives 61 on both sides of the first serial connection area 21 in the edge region 4 can be a figure-eight shape, an inverted figure-eight shape, a rectangle, a bracket shape, etc., and this embodiment of the present invention does not limit this. The first insulating adhesive 61 is provided on the side of the first fine grid 2 away from the substrate 1, which can isolate the solder strip provided in the first serial connection area 21 from the first fine grid 2, avoiding short circuits. Furthermore, the outline shape formed by the adjacent edges of the plurality of first insulating adhesives 61 on both sides of the first serial connection area 21 in the edge region 4 can be set according to the external outline shape of the first serial connection area 21 in the edge region 4.

[0081] Further reference Figure 6 In the edge region 4, a second insulating adhesive 62 is provided on the side of the second fine grid 3 on both sides of the second serial connection area 31 away from the substrate 1, and along the second direction Y, the length of the second insulating adhesive 62 located between the two serial connection areas is less than or equal to half the length of the second fine grid 3 located between the two serial connection areas.

[0082] The contour shape formed by the adjacent edges of the multiple second insulating adhesives 62 on both sides of the second serial connection area 31 in the edge region 4 is different from the contour shape formed by the adjacent edges of the multiple second insulating adhesives 62 on both sides of the second serial connection area 31 in the center region 5.

[0083] In this context, "multiple" can be understood as two or more. For example, the contour shape formed by the adjacent edges of two or more second insulating adhesives 62 on both sides of the second serial connection area 31 in the edge region 4 is different from the contour shape formed by the adjacent edges of two or more second insulating adhesives 62 on both sides of the second serial connection area 31 in the central region 5.

[0084] Specifically, the outline shape formed by the adjacent edges of the multiple second insulating adhesives 62 on both sides of the second serial connection area 31 in the edge region 4 can be a figure-eight shape, an inverted figure-eight shape, a rectangle, a bracket shape, etc., and this embodiment of the present invention does not limit this. The second insulating adhesive 62 is provided on the side of the second fine grid 3 away from the substrate, which can isolate the solder strip provided in the second serial connection area 31 from the second fine grid 3, preventing short circuits. Furthermore, the outline shape formed by the adjacent edges of the multiple second insulating adhesives 62 on both sides of the second serial connection area 31 in the edge region 4 can be set according to the external outline shape of the second serial connection area 31 in the edge region 4.

[0085] Further reference Figure 6 Along the direction from the central region 5 to the edge region 4, the outline shape formed by the adjacent edges of multiple first insulating adhesives 61 on both sides of the first serial connection area 21 in the edge region 4 includes a figure-eight shape.

[0086] Specifically, along the direction from the central region 5 to the edge region 4, the contour shape formed by the adjacent edges of multiple first insulating adhesives 61 on both sides of the first serial connection area 21 in the edge region 4 includes a figure-eight shape. This not only better isolates the first fine grids 2 on both sides of the first serial connection area 21 with a trapezoidal outer contour shape in the edge region 4, but also reduces the risk of poor soldering at the edge of the solder strip due to edge solder strip offset.

[0087] Furthermore, Figure 7 This is a partial structural diagram of another back contact battery including insulating adhesive according to an embodiment of the present invention, for reference. Figure 6 and Figure 7Along the direction from the central region 5 to the edge region 4, the contour shape formed by the adjacent edges of the multiple first insulating adhesives 61 on both sides of the first serial connection area 21 in the edge region 4 includes an inverted V-shape.

[0088] Specifically, the direction is set from the center region 5 to the edge region 4. The contour shape formed by the adjacent edges of the multiple first insulating adhesives 61 on both sides of the first serial connection area 21 in the edge region 4 includes an inverted V-shape, which can further prevent short circuits between the solder strip and the second fine grid 3.

[0089] Furthermore, Figure 8 This is a partial structural diagram of a back contact battery including insulating adhesive according to an embodiment of the present invention, with reference to... Figure 6 and Figure 8 In edge region 4, the distance between adjacent edges of two adjacent first insulating adhesives 61 along the second direction Y on both sides of the first serial connection area 21 is equal, and the distance between adjacent edges of two adjacent first insulating adhesives 61 along the second direction Y in edge region 4 is greater than the distance between adjacent edges of two adjacent first insulating adhesives 61 along the second direction Y in central region 5.

[0090] Specifically, in edge region 4, the distance between adjacent edges of multiple sets of adjacent first insulating adhesives 61 along the second direction Y on both sides of the first serial connection area 21 is equal, and the distance between adjacent edges of adjacent first insulating adhesives 61 along the second direction Y in edge region 4 is greater than the distance between adjacent edges of adjacent first insulating adhesives 61 along the second direction Y in central region 5. This prevents the occurrence of loose solder joints in edge region 4 due to the thicker insulating adhesive on the first fine grid 2. For example, the distance between adjacent edges of adjacent first insulating adhesives 61 along the second direction Y in edge region 4 can also be set to be equal to the distance between adjacent edges of adjacent first insulating adhesives 61 along the second direction Y in central region 5.

[0091] Furthermore, Figure 9 This is a partial structural diagram of a back contact battery including insulating adhesive according to an embodiment of the present invention, with reference to... Figure 6 and Figure 9 In edge region 4, the distance between two adjacent first insulating adhesives 61 on both sides of the first serial connection area 21 along the second direction Y gradually increases and then gradually decreases along the first direction X.

[0092] Specifically, in the edge region 4, the distance between two adjacent first insulating adhesives 61 on both sides of the first series connection area 21 along the second direction Y gradually increases and then gradually decreases along the first direction X. This allows the first insulating adhesive 61 to completely cover the first fine grid 2, increasing the connection between the solder ribbon and the grid line and avoiding the situation of loose solder ribbon connection. At the same time, since the areas on both sides of the first series connection area 21 are relatively narrow, the electron collection capability of the first fine grid 2 in the edge region 4 is enhanced, improving the performance of the back contact battery.

[0093] Further reference Figure 6 Along the direction from the central region 5 to the edge region 4, the outline shape formed by the adjacent edges of multiple second insulating adhesives 62 on both sides of the second serial connection area 31 in the edge region 4 includes a figure-eight shape.

[0094] Specifically, along the direction from the central region 5 to the edge region 4, the contour shape formed by the adjacent edges of multiple second insulating adhesives 62 on both sides of the second serial connection area 31 in the edge region 4 includes a figure-eight shape. This not only better isolates the second fine grids 3 on both sides of the second serial connection area 31 with a trapezoidal outer contour shape in the edge region 4, but also reduces the risk of poor soldering at the edge of the solder strip due to edge solder strip offset.

[0095] Further reference Figure 6 and Figure 7 Along the direction from the central region 5 to the edge region 4, the outline shape formed by the adjacent edges of the multiple second insulating adhesives 62 on both sides of the second serial connection area 31 in the edge region 4 includes an inverted V-shape.

[0096] Specifically, the direction is set from the center region 5 to the edge region 4, and the contour shape formed by the adjacent edges of the multiple second insulating adhesives 62 on both sides of the second serial connection area 31 in the edge region 4 includes an inverted V-shape, which can further prevent short circuits between the solder strip and the second fine grid 3.

[0097] Further reference Figure 6 and Figure 8 In edge region 4, the distance between adjacent edges of two adjacent second insulating adhesives 62 along the second direction Y on both sides of the second serial connection area 31 is equal, and the distance between adjacent edges of two adjacent second insulating adhesives 62 along the second direction Y in edge region 4 is greater than the distance between adjacent edges of two adjacent second insulating adhesives 62 along the second direction Y in central region 5.

[0098] Specifically, in edge region 4, the distance between adjacent edges of multiple sets of adjacent second insulating adhesives 62 along the second direction Y on both sides of the second serial connection area 31 is equal, and the distance between adjacent edges of adjacent second insulating adhesives 62 along the second direction Y in edge region 4 is greater than the distance between adjacent edges of adjacent second insulating adhesives 62 along the second direction Y in central region 5. This prevents the occurrence of loose solder joints in edge region 4 due to the thicker insulating adhesive on the second fine grid 3. For example, the distance between adjacent edges of adjacent second insulating adhesives 62 along the second direction Y in edge region 4 can also be set to be equal to the distance between adjacent edges of adjacent second insulating adhesives 62 along the second direction Y in central region 5.

[0099] Further reference Figure 6 and Figure 9 In edge region 4, the distance between two adjacent second insulating adhesives 62 on both sides of the second serial connection area 31 along the second direction Y gradually increases and then gradually decreases along the first direction X.

[0100] Specifically, in the edge region 4, the distance between two adjacent second insulating adhesives 62 on both sides of the second series connection area 31 along the second direction Y gradually increases and then gradually decreases along the first direction X. This allows the second insulating adhesive 62 to completely wrap the second fine grid 3, increasing the connection between the solder ribbon and the grid line and avoiding the situation of loose solder ribbon connection. At the same time, since the areas on both sides of the second series connection area 31 are relatively narrow, the electron collection capability of the second fine grid 3 in the edge region 4 is enhanced, improving the performance of the back contact battery.

[0101] This utility model embodiment also provides a battery assembly, including the back contact battery described in any embodiment of this utility model.

[0102] This utility model embodiment also provides a photovoltaic system, including the battery module described in any embodiment of this utility model.

[0103] It should be understood that the various forms of the process shown above can be used, with steps reordered, added, or deleted. For example, the steps described in this utility model can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this utility model can be achieved, and this is not limited herein.

[0104] The specific embodiments described above do not constitute a limitation on the scope of protection of this utility model. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A back-contact battery, characterized in that, include: A substrate has a plurality of first fine gates and a plurality of second fine gates disposed on its back side, the plurality of first fine gates and the plurality of second fine gates being alternately arranged along a first direction; a plurality of adjacent edges of two adjacent first fine gates along a second direction forming a plurality of first serial connection areas, and a plurality of adjacent edges of two adjacent second fine gates along the second direction forming a plurality of second serial connection areas, the plurality of first serial connection areas and the plurality of second serial connection areas being alternately arranged along a second direction; a plurality of first fine gates penetrating the second serial connection areas, and a plurality of second fine gates penetrating the first serial connection areas; wherein, the first direction and the second direction intersect each other; The back surface of the substrate is divided into an edge region and a central region; at least part of the outer contour shape of the first interconnection area in the edge region is different from the outer contour shape of the first interconnection area in the central region; wherein, the edge region is a region formed by a predetermined number of first fine gates near the edge of the substrate, and the central region is the region between the two edge regions.

2. The back contact battery according to claim 1, characterized in that, The outer contour shape of at least a portion of the second serialization area in the edge region is different from the outer contour shape of the second serialization area in the center region.

3. The back contact battery according to claim 1, characterized in that, The outer contour shape of each of the first connecting areas in the edge region is different from the outer contour shape of the first connecting area in the center region.

4. The back contact battery according to claim 2, characterized in that, The outer contour shape of each of the second connecting areas in the edge region is different from the outer contour shape of the second connecting area in the center region.

5. The back contact battery according to claim 1, characterized in that, Along the direction from the central region to the edge region, the outer contour shape of the first connecting area in the edge region includes a trapezoid.

6. The back contact battery according to claim 1, characterized in that, Along the direction from the central region to the edge region, the outer contour shape of the first connecting area in the edge region includes an inverted trapezoid.

7. The back contact battery according to claim 1, characterized in that, The outer contour shape of the first serialization area in the edge region includes a rectangle, and the distance between two adjacent first fine gates in the edge region along the second direction is greater than the distance between two adjacent first fine gates in the center region along the second direction.

8. The back contact battery according to claim 1, characterized in that, In the edge region, the distance between two adjacent first fine gates on both sides of the first serialization area along the second direction gradually increases and then gradually decreases along the first direction.

9. The back contact battery according to claim 2, characterized in that, Along the direction from the central region to the edge region, the outer contour shape of the second concatenation area in the edge region includes a trapezoid.

10. The back contact battery according to claim 2, characterized in that, Along the direction from the central region to the edge region, the outer contour shape of the second concatenation area in the edge region includes an inverted trapezoid.

11. The back contact battery according to claim 2, characterized in that, The outer contour shape of the second serial area in the edge region includes a rectangle, and the distance between two adjacent second fine gates in the edge region along the second direction is greater than the distance between two adjacent second fine gates in the center region along the second direction.

12. The back contact battery according to claim 2, characterized in that, In the edge region, the distance between two adjacent second fine gates on both sides of the second serial area along the second direction gradually increases and then gradually decreases along the first direction.

13. The back contact battery according to claim 1, characterized in that, The preset quantity is less than or equal to 10.

14. The back contact battery according to claim 1, characterized in that, In the edge region, a first insulating adhesive is provided on the side of the first fine grid on both sides of the first serial connection area away from the substrate, and along the second direction, the length of the first insulating adhesive located between the two serial connection areas is less than or equal to half the length of the first fine grid located between the two serial connection areas. The contour shape formed by the adjacent edges of the first insulating adhesive on both sides of the first serial connection area in the edge region is different from the contour shape formed by the adjacent edges of the first insulating adhesive on both sides of the first serial connection area in the central region.

15. The back contact battery according to claim 1, characterized in that, In the edge region, a second insulating adhesive is provided on the side of the second fine grid on both sides of the second serial connection area away from the substrate, and along the second direction, the length of the second insulating adhesive located between the two serial connection areas is less than or equal to half the length of the second fine grid located between the two serial connection areas; The contour shape formed by the adjacent edges of the second insulating adhesive on both sides of the second serial connection area in the edge region is different from the contour shape formed by the adjacent edges of the second insulating adhesive on both sides of the second serial connection area in the central region.

16. The back contact battery according to claim 14, characterized in that, Along the direction from the central region to the edge region, the contour shape formed by the adjacent edges of the plurality of first insulating adhesives on both sides of the first serial connection area in the edge region includes a figure-eight shape.

17. The back contact battery according to claim 14, characterized in that, Along the direction from the central region to the edge region, the contour shape formed by the adjacent edges of the plurality of first insulating adhesives on both sides of the first serial connection area in the edge region includes an inverted V-shape.

18. The back contact battery according to claim 14, characterized in that, In the edge region, the distance between adjacent edges of two adjacent first insulating adhesives along the second direction on both sides of the first serial connection area is equal, and the distance between adjacent edges of two adjacent first insulating adhesives along the second direction in the edge region is greater than the distance between adjacent edges of two adjacent first insulating adhesives along the second direction in the central region.

19. The back contact battery according to claim 14, characterized in that, In the edge region, the distance between two adjacent first insulating adhesives on both sides of the first serial connection area along the second direction gradually increases and then gradually decreases along the first direction.

20. The back contact battery according to claim 15, characterized in that, Along the direction from the central region to the edge region, the contour shape formed by the adjacent edges of multiple second insulating adhesives on both sides of the second serial connection area in the edge region includes a figure-eight shape.

21. The back contact battery according to claim 15, characterized in that, Along the direction from the central region to the edge region, the contour shape formed by the adjacent edges of the plurality of second insulating adhesives on both sides of the second serial connection area in the edge region includes an inverted V-shape.

22. The back contact battery according to claim 15, characterized in that, In the edge region, the distance between adjacent edges of two adjacent pairs of the second insulating adhesive along the second direction on both sides of the second serial connection area is equal, and the distance between adjacent edges of two adjacent pairs of the second insulating adhesive along the second direction in the edge region is greater than the distance between adjacent edges of two adjacent pairs of the second insulating adhesive along the second direction in the center region.

23. The back contact battery according to claim 15, characterized in that, In the edge region, the distance between two adjacent second insulating adhesives on both sides of the second serial connection area along the second direction gradually increases and then gradually decreases along the first direction.

24. A battery assembly, characterized in that, Includes the back contact battery as described in any one of claims 1 to 23.

25. A photovoltaic system, characterized in that, Includes the battery assembly as described in claim 24.

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