Back contact cell assembly and system

Abstract

The present invention relates to the field of solar energy cell technology and discloses a back contact cell assembly and system, wherein the assembly comprises a cell string, an insulating strip and a busbar, wherein the cell string comprises an adjacent first cell plate and a second cell plate, wherein the insulating strip is installed on the light-displaying surface of the first cell plate, wherein a second welding ribbon connects the second cell plate and the busbar respectively, and wherein the insulating strip isolates the second welding ribbon and the first cell plate.

Description

Technology Field

[0001] Cross-reference of related applications

[0002] The present invention claims priority to patent applications filed with the Chinese Intellectual Property Office on June 14, 2024, with patent application number 202421366666.4, and filed with the Chinese Intellectual Property Office on September 11, 2024, with patent application numbers 202411273475.8 and 202411276522.4, the entire contents of which are incorporated into the present invention by means of citation.

[0003] The present invention relates to the field of solar energy cell technology, and in particular to a back contact cell assembly and a photovoltaic system. Background Technology

[0004] Solar energy cell power generation is a sustainable clean energy source capable of converting sunlight into electrical energy by utilizing the photoelectric effect of a semiconductor pn junction. In related technology, multiple back-contact cell plates undergo steps such as serial welding, lamination, and packaging to form a back-contact cell assembly. Here, the back-contact cell assembly includes a busbar used in series; however, if the busbar is exposed to the outside, it affects the aesthetics of the cell plates and reduces the light-receiving area of ​​the cell plates, resulting in poor power generation efficiency.

[0005] In some products, a busbar is mounted at an intermediate position on the back of the cell plate, and an insulating strip is installed between the busbar and the cell plate. Although this installation method can conceal the busbar, to ensure that the busbar can contact a welding ribbon of the same polarity on the cell plate while simultaneously being insulated from a welding ribbon of the opposite polarity on the cell plate, it is necessary to perform perforations in the insulating strip or replace the busbar with intermittently installed insulating blocks. However, this installation method places relatively high demands on the precision of the perforations in the insulating strip and the alignment positioning of the insulating blocks, resulting in high production difficulty. Furthermore, positional shifts are prone to occur when performing perforations in the insulating strip or when laminating the insulating blocks, and shifts in the width direction can easily lead to short circuits. The problem to be solved

[0006] The objective of the present invention is to provide a back contact cell assembly and a photovoltaic system in relation to the existing state of technology.

[0007] One of the objectives of the present invention is to solve the problem of preventing the busbar from being exposed and the power generation efficiency from decreasing. In the present invention, the effective light-receiving area of ​​the cell assembly can be increased and the assembly switching efficiency can be improved, so the area of ​​the busbar observed from one side of the light-receiving surface becomes smaller and even completely hidden, making it more aesthetically pleasing.

[0008] At the same time, the present invention can effectively reduce production difficulty, reduce the risk of cell plate short circuits, potential cracks, and breakage, and improve reliability. means of solving the problem

[0009] To achieve the above-mentioned objective, the present invention uses the following technical method.

[0010] First, the present invention provides a back contact cell assembly, which comprises a cell string, an insulating strip, and a busbar, and

[0011] The cell string comprises a plurality of serially connected cell plates, wherein the plurality of cell plates are distributed along a first direction;

[0012] An insulating strip is installed on the light distribution surface of a cell plate along a second direction, wherein the first direction and the second direction are set to intersect;

[0013] A busbar is installed on one side of an insulating strip far from the cell plate along a second direction, and the insulating strip covers the surface of one side of the busbar close to the cell plate;

[0014] The cell string includes adjacent first cell plates and second cell plates, and an insulating strip is installed on the light distribution surface of the first cell plate, and a second welding ribbon connects the second cell plate and the bus bar respectively, and the insulating strip isolates the second welding ribbon and the first cell plate.

[0015] In some embodiments, the insulating strip in the second direction covers the busbar; and the insulating strip in the first direction covers the busbar and exceeds it.

[0016] In some embodiments, the back contact cell assembly further comprises a welding ribbon, the welding ribbon comprises a first welding ribbon and a second welding ribbon, the first welding ribbon is for connecting adjacent cell plates and the second welding ribbon is for connecting cell plates and busbars.

[0017] In some embodiments, the second welding ribbon is installed on one side of the busbar far from the insulating strip, or the second welding ribbon is installed on one side of the busbar close to the insulating strip.

[0018] In some embodiments, the first cell plate and the second cell plate are installed at least partially stacked.

[0019] In some embodiments, when the light-distributing surface of the first cell plate and the light-receiving surface of the second cell plate are at least partially laminated, the insulating strip is at least partially connected to the light-distributing surface of the second cell plate.

[0020] In some embodiments, the cell plate is rectangular, and the cell plate further includes a chamfered edge and a cutting edge, the chamfered edge and the cutting edge are both distributed on both sides of the cell plate along a first direction, and the first direction and the second direction are set to be perpendicular.

[0021] In some embodiments, in a first direction, the chamfered edge of the cell plate and the chamfered edge of the adjacent cell plate are installed as a docking connection, and the cutting edge of the cell plate and the cutting edge of the adjacent cell plate are installed as a docking connection; or in a first direction, the chamfered edge of the cell plate and the cutting edge of the adjacent cell plate are installed as a docking connection, and the cutting edge of the cell plate and the chamfered edge of the adjacent cell plate are installed as a docking connection.

[0022] In some embodiments, the chamfered edge of each cell plate is installed laminated on the light distribution surface on the side where the cutting edge of an adjacent cell plate is located.

[0023] Secondly, the present invention provides a back contact cell assembly, comprising a cell string, a first insulating strip, a first busbar, and a second welding ribbon A, and

[0024] The cell string includes cell plates arranged in series with each other, and the cell plates include a fifth cell plate and a sixth cell plate arranged along a first direction, and

[0025] The first insulating strip is installed at one end of the sixth cell plate near the fifth cell plate, and

[0026] The first busbar is installed on one side of the first insulating strip oriented on the sixth cell plate, and

[0027] The first insulation strip and the first busbar are both installed extending along the second direction, and the first direction and the second direction are set to intersect, and

[0028] The second welding ribbon A is for electrically connecting the first busbar and the fifth cell plate, and

[0029] In the first direction, a first width extension section and a second width extension section are installed at both ends of the first insulation strip, extending to the outside of the first busbar edge, and the first width extension section and the second width extension section are installed sequentially along a direction far from the fifth cell plate, and the width of the second width extension section is smaller than the width of the first width extension section.

[0030] In some embodiments, the first width extension section extends at least partially to the outside of the edge of the sixth cell plate.

[0031] In some embodiments, in the first direction, the orthographic projection of the first width extension section in the thickness direction of the sixth cell plate and the orthographic projection of the fifth cell plate in the thickness direction of the sixth cell plate overlap at least partially.

[0032] In some embodiments, in the first direction, the width D2 of the second width extension section is ≥1mm.

[0033] In some embodiments, the fifth cell plate and the sixth cell plate are installed on the same plane, and here,

[0034] 1mm<D1≤l 11 +l 12 +l 13 is,

[0035] In the formula, D1 is the width of the first width extension section in the first direction, and l 11 is the relative width distance between the edge of one end of the sixth cell plate near the fifth cell plate from the first busbar in the first direction, and l 12 is the gap between the 5th cell plate and the 6th cell plate, and l13 is the relative width distance from the edge of one end of the fifth cell plate near the sixth cell plate to the first welding point, and the first welding point is installed at one end of the fifth cell plate near the sixth cell plate to be connected to the second welding ribbon A.

[0036] In some embodiments, one end of the sixth cell plate close to the fifth cell plate and the fifth cell plate are at least partially stacked, where,

[0037] 1mm<D1≤l 21 +l 23 -l 22 is,

[0038] In the formula, D1 is the width of the first width extension section in the first direction, and l 21 is the relative width distance between the edge of one end of the sixth cell plate near the fifth cell plate from the first busbar in the first direction, and l 22 is the width of the stacked area between the 5th cell plate and the 6th cell plate in the 1st direction, and l 23 is the relative width distance from the edge of one end of the fifth cell plate near the sixth cell plate to the first welding point, and the first welding point is installed at one end of the fifth cell plate near the sixth cell plate to be connected to the second welding ribbon A.

[0039] In some embodiments, the cell assembly further includes a front plate, and the cell string is installed on the front plate, and the front plate has a first edge and a second edge arranged along a second direction, and the orthographic projection of the first insulating strip in the direction of the sixth cell plate thickness is located between the first edge and the second edge.

[0040] In some embodiments, in the first direction, the orthographic projection of the first busbar in the thickness direction of the sixth cell plate is located within the sixth cell plate.

[0041] In some embodiments, the cell assembly includes at least one serial cell string group, and the same serial cell string group includes two cell strings arranged along a second direction and installed in series with each other, and in the same serial cell string group, extends from a sixth cell plate in one cell string to a sixth cell plate in another cell string through the same first busbar.

[0042] In some embodiments, a fourth cell plate is installed at one end of each cell string far from the fifth cell plate, and a third cell plate is installed at one end of the fourth cell plate close to the fifth cell plate.

[0043] The back contact cell assembly further includes a second insulating strip, an intermediate busbar, and a second weld B, and

[0044] The second insulating strip is installed on the edge of the third cell plate in the cell string, and the second insulating strip is installed at one end of the third cell plate near the fourth cell plate, and

[0045] An intermediate busbar is for parallelizing two cell strings installed adjacently in a first direction, and the intermediate busbar is installed on one side of a second insulating strip oriented on a third cell plate, and

[0046] The second insulation strip and the intermediate busbar are both installed extending along the second direction, and

[0047] The second welding ribbon B is intended to electrically connect the intermediate busbar, the fourth cell plate in the cell string, and the fourth cell plate in another cell string adjacent to the cell string in the first direction.

[0048] In some embodiments, in a first direction, a first external extension section and a second external extension section are installed at both ends of the second insulating strip, extending to the outside of the intermediate busbar edge, and the first external extension section and the second external extension section are installed sequentially along a direction away from the fourth cell plate, the first external extension section extends at least partially to the outside of the edge of the third cell plate, and the width of the second external extension section is smaller than the width of the first external extension section.

[0049] Thirdly, the present invention further comprises a back contact cell assembly, which includes a parallel cell string group, a second insulating strip, an intermediate busbar, and a second welding ribbon B, and

[0050] The same parallel cell string group comprises at least two cell strings arranged along a first direction and installed in parallel with each other, each cell string comprises cell plates serially arranged with each other, the cell plates serially arranged with each other comprise a third cell plate and a fourth cell plate arranged along the first direction, and the fourth cell plate of the two cell strings installed in parallel with each other is installed adjacently in the first direction, and

[0051] The second insulating strip is installed on the edge of the third cell plate in the cell string, and the second insulating strip is installed at one end of the third cell plate near the fourth cell plate, and

[0052] An intermediate busbar is for parallelizing two cell strings installed adjacently in a first direction, and the intermediate busbar is installed on one side of a second insulating strip oriented on a third cell plate, and

[0053] The second insulation strip and the intermediate busbar are both installed extending along the second direction, and

[0054] The second welding ribbon B is for electrically connecting an intermediate busbar, a fourth cell plate in a cell string where the intermediate busbar is located, and a fourth cell plate in another cell string adjacent to the cell string in a first direction, and

[0055] Here, in the first direction, a first external extension section and a second external extension section are installed at both ends of the second insulating strip, extending to the outside of the edge of the intermediate busbar, and the first external extension section and the second external extension section are installed sequentially along a direction far from the fourth cell plate, and the width of the second external extension section is smaller than the width of the first external extension section.

[0056] In some embodiments, the first outer extension section extends at least partially to the outside of the edge of the third cell plate.

[0057] In some embodiments, in the first direction, the orthographic projection of the first outer extension section in the thickness direction of the third cell plate and the orthographic projection of the fourth cell plate in the thickness direction of the third cell plate overlap at least partially.

[0058] In some embodiments, in the first direction, the width d2 of the second outer extension section is ≥1mm.

[0059] In some embodiments, the fourth cell plate and the third cell plate are installed on the same plane, and here,

[0060] 1mm<d1≤l 31 +l 32 +l 33 is,

[0061] In the formula, d1 is the width of the first outer extension section in the first direction, and l 31 is the relative width distance between the edge of one end of the third cell plate near the fourth cell plate from the intermediate busbar in the first direction in a cell string where an intermediate busbar is installed, and l 32is the gap between the fourth cell plate and the third cell plate in a cell string with an intermediate busbar installed, and l 33 The distance is the relative width from the edge of one end of the fourth cell plate near the third cell plate to the second welding point in the cell string where the intermediate busbar is installed, and the second welding point is installed on the fourth cell plate in the cell string where the intermediate busbar is located, and is also installed at one end of the fourth cell plate near the third cell plate, so as to be connected to each other with the second welding ribbon B.

[0062] In some embodiments, in a cell string with an intermediate busbar installed, one end of a third cell plate close to a fourth cell plate and the fourth cell plate are at least partially stacked, and here,

[0063] 1mm<d1≤l 41 +l 43 -l 42 is,

[0064] In the formula, d1 is the width of the first outer extension section in the first direction, and l 41 is the relative width distance between the edge of one end of the third cell plate near the fourth cell plate from the intermediate busbar in the first direction in a cell string where an intermediate busbar is installed, and l 42 is the width of the stacked area between the third cell plate and the fourth cell plate in the first direction, and l 43 The distance is the relative width from the edge of one end of the fourth cell plate near the third cell plate to the second welding point in the cell string where the intermediate busbar is installed, and the second welding point is installed at one end of the fourth cell plate near the third cell plate to be connected to each other with the second welding ribbon B.

[0065] In some embodiments, the cell assembly further includes a front plate, and the cell string is installed on the front plate, and the first edge and the second edge are arranged along a second direction on the front plate, and the orthographic projection of the second insulating strip in the thickness direction of the third cell plate is located between the first edge and the second edge.

[0066] Fourth, a back contact cell assembly is provided, comprising a cell string, a first insulating strip, a first busbar, and a second welding ribbon A, and

[0067] The cell string includes cell plates arranged in series with each other, and the cell plates include a fifth cell plate and a sixth cell plate arranged along a first direction, and

[0068] The first insulating strip is installed at one end of the sixth cell plate near the fifth cell plate, and

[0069] The first busbar is installed on one side of the first insulating strip oriented on the sixth cell plate, and

[0070] The first insulation strip and the first busbar are both installed extending along the second direction, and the first direction and the second direction are set to intersect, and

[0071] The second welding ribbon A is for electrically connecting the first busbar and the fifth cell plate, and

[0072] Here, an external extension section protruding outside the first busbar is installed at one end of the first insulating strip near the fifth cell plate, and the external extension section extends outside the sixth cell plate, and in the thickness direction of the sixth cell plate, the orthographic projection of the external extension section and the orthographic projection of the fifth cell plate overlap at least partially.

[0073] In some embodiments, the fifth cell plate and the sixth cell plate are installed on the same plane, and

[0074] In the first direction, the width of the portion protruding outside the sixth cell plate of the external extension section is greater than the gap between the fifth cell plate and the sixth cell plate.

[0075] In some embodiments, in the first direction, the width of the outer extension section is,

[0076] 1mm≤L1≤l 11 +l 12 +l 13 And,

[0077] In the formula, L1 is the width of the outer extension section in the first direction, and l 11 is the gap between the 5th cell plate and the 6th cell plate, and l 12 is the relative width distance from the edge of one end of the fifth cell plate near the sixth cell plate to the first weld point, the first weld point is for connecting to the second weld ribbon A, is installed at one end of the fifth cell plate near the sixth cell plate, and l 13 is the relative width distance between the edge of one end of the first busbar near the fifth cell plate and the edge of one end of the sixth cell plate near the fifth cell plate.

[0078] In some embodiments, in the first direction, the width of the outer extension section is,

[0079] 1mm≤L1≤l 11 +l 13 It is +4mm, and

[0080] In the formula, L1 is the width of the outer extension section in the first direction, and l 11 is the gap between the 5th cell plate and the 6th cell plate, and l 13 is the relative width distance between the edge of one end of the first busbar near the fifth cell plate and the edge of one end of the sixth cell plate near the fifth cell plate.

[0081] In some embodiments, one end of the sixth cell plate close to the fifth cell plate and the fifth cell plate are at least partially stacked, and

[0082] In the first direction, the width of the outer extension section is greater than the width of the stacking area between the fifth cell plate and the sixth cell plate.

[0083] In some embodiments, the width of the outer extension section is,

[0084] 1mm≤L2≤l 22 +l 23 -l 21 And,

[0085] In the formula, L2 is the width of the outer extension section in the first direction, and l 21 is the width of the stacked area between the 5th cell plate and the 6th cell plate, and l 22 is the relative width distance from the edge of one end of the fifth cell plate near the sixth cell plate to the first weld point, the first weld point is for connecting with the second weld ribbon A, and is also installed at one end of the fifth cell plate near the sixth cell plate, l 23 is the relative width distance between the edge of one end of the first busbar near the fifth cell plate and the edge of one end of the sixth cell plate near the fifth cell plate.

[0086] In some embodiments, the width of the outer extension section is,

[0087] 1mm≤L2≤l 23 +4mm-l 21 And,

[0088] In the formula, L2 is the width of the outer extension section in the first direction, and l 21 is the width of the stacked area between the 5th cell plate and the 6th cell plate, and l 23 is the relative width distance between the edge of one end of the first busbar near the fifth cell plate and the edge of one end of the sixth cell plate near the fifth cell plate.

[0089] In some embodiments, the cell assembly includes at least one serial cell string group, and the same serial cell string group includes two cell strings arranged along a second direction and installed in series with each other, and in the same serial cell string group, extends from a sixth cell plate in one cell string to a sixth cell plate in another cell string through the same first busbar.

[0090] In some embodiments, a fourth cell plate is installed at one end of each cell string far from the fifth cell plate, and a third cell plate is installed at one end of the fourth cell plate close to the fifth cell plate.

[0091] A cell assembly includes a parallel cell string group, and the same parallel cell string group includes at least two cell strings arranged along a first direction and installed in parallel with each other, and a fourth cell plate among the two cell strings installed in parallel with each other is installed adjacently in the first direction, and

[0092] The back contact cell assembly further includes a second insulating strip, an intermediate busbar, and a second weld B, and

[0093] The second insulating strip is installed on the edge of the third cell plate in the cell string, and the second insulating strip is installed at one end of the third cell plate near the fourth cell plate, and

[0094] An intermediate busbar is for parallelizing two cell strings installed adjacently in a first direction, and the intermediate busbar is installed on one side of a second insulating strip oriented on a third cell plate, and

[0095] The second insulation strip and the intermediate busbar are both installed extending along the second direction, and

[0096] The second welding ribbon B is intended to electrically connect the intermediate busbar, the fourth cell plate in the cell string, and the fourth cell plate in another cell string adjacent to the cell string in the first direction.

[0097] In some embodiments, an extension section protruding outside the intermediate busbar is installed at one end of the second insulating strip near the fourth cell plate, and the extension section extends outside the third cell plate, and in the thickness direction of the third cell plate, the orthographic projection of the extension section and the orthographic projection of the fourth cell plate in the cell string where the extension section is located overlap at least partially.

[0098] Fifth, the present invention provides a back contact cell assembly, comprising a parallel cell string group, a second insulating strip, an intermediate busbar, and a second welding ribbon B, and

[0099] The same parallel cell string group comprises at least two cell strings arranged along a first direction and installed in parallel with each other, each cell string comprises cell plates arranged in series with each other, the cell plates comprise a third cell plate and a fourth cell plate arranged along the first direction, and the fourth cell plate of the two cell strings installed in parallel with each other is installed adjacently in the first direction, and

[0100] The second insulating strip is installed on the edge of the third cell plate in the cell string, and the second insulating strip is installed at one end of the third cell plate near the fourth cell plate, and

[0101] An intermediate busbar is for parallelizing two cell strings installed adjacently in a first direction, and the intermediate busbar is installed on one side of a second insulating strip oriented on a third cell plate, and

[0102] The second insulation strip and the intermediate busbar are both installed extending along the second direction, and

[0103] The second welding ribbon B is for electrically connecting an intermediate busbar, a fourth cell plate in a cell string where the intermediate busbar is located, and a fourth cell plate in another cell string adjacent to the cell string in a first direction, and

[0104] Here, an extension section protruding outside the intermediate busbar is installed at one end of the second insulating strip near the fourth cell plate, and the extension section extends outside the third cell plate, and in the thickness direction of the third cell plate, the orthographic projection of the extension section and the orthographic projection of the fourth cell plate in the cell string where the extension section is located overlap at least partially.

[0105] In some embodiments, in a cell string with a second insulating strip installed, the fourth cell plate and the third cell plate are installed on the same plane, and

[0106] In the first direction, the width of the portion protruding outside the third cell plate of the extended section is greater than the gap between the fourth cell plate and the third cell plate.

[0107] In some embodiments, in the first direction, the width of the extended section is,

[0108] 1mm≤L3≤l 31 +l 32 +l 33 And,

[0109] In the formula, L3 is the width of the extended section in the first direction, and l 31 is the gap between the fourth cell plate and the third cell plate in the cell string where the second insulation strip is installed, and l 32 is the relative width distance from the edge of one end of the fourth cell plate near the third cell plate to the second weld point in the cell string where the second insulation strip is installed, and l 33It is installed in a cell string where a second insulating strip is installed, and is the relative width distance between the edge of one end of an intermediate busbar near the fourth cell plate and the edge of one end of a third cell plate near the fourth cell plate.

[0110] In some embodiments, in the first direction, the width of the extended section is,

[0111] 1mm≤L3≤l 31 +l 33 It is +4mm, and

[0112] In the formula, L3 is the width of the extended section in the first direction, and l 31 is the gap between the fourth cell plate and the third cell plate in the cell string where the second insulation strip is installed, and l 33 is the relative width distance between the edge of one end of the intermediate busbar near the fourth cell plate and the edge of one end of the third cell plate near the fourth cell plate in the cell string where the second insulation strip is installed.

[0113] In some embodiments, in a cell string with a second insulating strip installed, one end of a third cell plate close to a fourth cell plate and the fourth cell plate are at least partially laminated, and

[0114] In the first direction, the width of the extended section is greater than the width of the stacked area between the third cell plate and the fourth cell plate.

[0115] In some embodiments, in the first direction, the width of the extended section is,

[0116] 1mm≤L4≤l 42 +l 43 -l 41 And,

[0117] In the formula, L4 is the width of the extended section in the first direction, and l 41 is the width of the stacking area between the third cell plate and the fourth cell plate, and l 42is the relative width distance from the edge of one end of the fourth cell plate near the third cell plate to the second weld point in the cell string where the second insulation strip is installed, and l 43 It is installed in a cell string where a second insulating strip is installed, and is the relative width distance between the edge of one end of an intermediate busbar near the fourth cell plate and the edge of one end of a third cell plate near the fourth cell plate.

[0118] In some embodiments, in the first direction, the width of the extended section is,

[0119] 1mm≤L4≤l 43 -l 41 It is +4mm, and

[0120] In the formula, L4 is the width of the extended section in the first direction, and l 41 is the width of the stacking area between the third cell plate and the fourth cell plate, and l 42 is the relative width distance from the edge of one end of the fourth cell plate near the third cell plate to the second weld point in the cell string where the second insulation strip is installed, and l 43 is the relative width distance between the edge of one end of the intermediate busbar near the fourth cell plate and the edge of one end of the third cell plate near the fourth cell plate in the cell string where the second insulation strip is installed.

[0121] Sixth, the present invention further includes a photovoltaic system comprising the back contact cell assembly described above. Effects of the invention

[0122] The beneficial effects of the present invention are as follows.

[0123] 1) In the present invention, the busbar is hidden from the light-receiving surface of a plurality of cell plates, so the busbar cannot be observed from one side of the light-receiving surface, and the overall color of the front of the back-contact cell assembly is unified and aesthetically pleasing. At the same time, an insulating strip can be installed between the busbar and the cell plate, thereby preventing the occurrence of short-circuit problems. Next, compared to installing a busbar at an intermediate position on the back of a cell plate, the busbar of the present invention is installed at one end of a first cell plate close to a second cell plate, and the second welding ribbon is installed on the second cell plate, so that the second welding ribbon can be sufficiently bonded and welded to the effective welding position of the second cell plate, and prevents the welding of the second welding ribbon and the second cell plate from being insufficient due to the installation of the busbar, thereby preventing the current collection from being affected. At the same time, after the second welding ribbon is welded to the second cell plate, it can be directly connected to the busbar without the need to perform an opening process on the insulating strip or replace it with an intermittently installed insulating block, and during assembly, only the entire insulating strip needs to be placed at one end of the first cell plate close to the second cell plate, thereby effectively reducing the production precision requirements and production difficulty, and preventing short circuits caused by position shifts when performing an opening on the insulating strip or when laminating the insulating block, thereby increasing the product yield.

[0124] 2) In one aspect, the edge portion busbar embedded structure of the present invention can increase the effective light-receiving area of ​​the cell assembly and improve assembly switching efficiency, and the area of ​​the busbar observed from one side of the light-receiving surface becomes smaller, and the busbar can even be completely hidden, thereby further improving the overall aesthetics of the cell assembly; In another aspect, it is possible to ensure that the second welding ribbon A is sufficiently bonded and welded to the effective welding position of the fifth cell plate, and to prevent the welding between the second welding ribbon A and the fifth cell plate from becoming insufficient due to the mounting of the first busbar, thereby preventing it from affecting the collection of current, and during assembly, only one entire first insulating strip needs to be placed at one end of the sixth cell plate close to the fifth cell plate, and at the same time, through the installation of the first width extension section and the second width extension section, it is possible to allow a certain degree of shift in the width direction of the first insulating strip relative to the first busbar and the first insulating strip relative to the two cell plates during the manufacturing process, effectively reducing production precision requirements and the risk of short circuits, and ensuring that the cell assembly has a relatively high double-sided efficiency rate; In addition, the edge busbar embedded structure of the present invention can be applied to a back contact cell assembly containing a main grid and a back contact cell assembly not containing a main grid, thereby providing greater versatility, lowering the stress during lamination of the edge busbar embedded structure, reducing the risk of potential cracking or breakage of the cell plate, and improving the reliability of the back contact cell assembly.

[0125] 3) In one aspect, the intermediate busbar embedded structure of the present invention can increase the effective light-receiving area of ​​the cell assembly and improve assembly switching efficiency, and the area of ​​the busbar observed from one side of the light-receiving surface is reduced, and the busbar can even be completely hidden, thereby further improving the overall aesthetics of the cell assembly; in another aspect, it can ensure that the second welding ribbon B is sufficiently bonded and welded to the effective welding position of the fourth cell plate, and prevent the welding between the second welding ribbon B and the fourth cell plate from becoming insufficient due to the mounting of the intermediate busbar, thereby preventing the current collection from being affected, and during assembly, only one entire second insulating strip needs to be placed at one end of the third cell plate close to the fourth cell plate, and at the same time, through the installation of the first extension section and the second extension section, it can allow for a certain degree of shift in the width direction of the second insulating strip relative to the intermediate busbar and the second insulating strip relative to the two cell plates during the manufacturing process, effectively reducing production precision requirements and the risk of short circuits, and ensuring that the cell assembly has a relatively high double-sided efficiency rate; Furthermore, the intermediate busbar embedded structure of the present invention can be applied to a back contact cell assembly containing a main grid and a back contact cell assembly not containing a main grid, thereby providing greater versatility, reducing stress during lamination of the intermediate busbar embedded structure, lowering the risk of potential cracking or breakage of the cell plate, and ensuring good reliability of the back contact cell assembly.

[0126] 4) In one aspect, the edge portion busbar embedded structure of the present invention can increase the effective light-receiving area of ​​the cell assembly and improve assembly switching efficiency, and the area of ​​the busbar observed from one side of the light-receiving surface is reduced, and the busbar can even be completely hidden, thereby further improving the overall aesthetics of the cell assembly; in another aspect, it can ensure that the second welding ribbon A is sufficiently bonded and welded to the effective welding position of the fifth cell plate, and prevent the welding between the second welding ribbon A and the fifth cell plate from becoming insufficient due to the installation of the first busbar, thereby preventing the current collection from being affected, and during assembly, only the entire first insulating strip needs to be placed at one end of the sixth cell plate close to the fifth cell plate, and at the same time, through the installation of an extended section, it can allow for a certain degree of shift in the width direction of the first insulating strip relative to the first busbar and the first insulating strip relative to the two cell plates during the manufacturing process, effectively reducing production precision requirements and production difficulty, and effectively reducing the risk of short circuit; In addition, the edge busbar embedded structure of the present invention can be applied to a back contact cell assembly containing a main grid and a back contact cell assembly not containing a main grid, thereby providing greater versatility, lowering the stress during lamination of the edge busbar embedded structure, reducing the risk of potential cracking or breakage of the cell plate, and improving the reliability of the back contact cell assembly.

[0127] 5) In one aspect, the intermediate busbar embedded structure of the present invention can increase the effective light-receiving area of ​​the cell assembly and improve assembly switching efficiency, and the area of ​​the busbar observed from one side of the light-receiving surface is reduced, and the busbar can even be completely hidden, thereby further improving the overall aesthetics of the cell assembly; in another aspect, it can ensure that the second welding ribbon B is sufficiently bonded and welded to the effective welding position of the fourth cell plate, and prevent the welding between the second welding ribbon B and the fourth cell plate from becoming insufficient due to the installation of the intermediate busbar, thereby preventing the current collection from being affected, and during assembly, only one entire second insulating strip needs to be placed at one end of the third cell plate close to the fourth cell plate, and at the same time, through the installation of an extended section, it can allow for a certain degree of shift in the width direction of the second insulating strip relative to the intermediate busbar and the second insulating strip relative to the two cell plates during the manufacturing process, effectively reducing production precision requirements and production difficulty, and effectively reducing the risk of short circuits; Furthermore, the intermediate busbar embedded structure of the present invention can be applied to a back contact cell assembly containing a main grid and a back contact cell assembly not containing a main grid, thereby providing greater versatility, reducing stress during lamination of the intermediate busbar embedded structure, lowering the risk of potential cracking or breakage of the cell plate, and ensuring good reliability of the back contact cell assembly. Brief explanation of the drawing

[0128] FIG. 1 is an exemplary structural diagram of a back contact cell assembly provided in an embodiment of the present invention. FIG. 2 is an example diagram of the cross-sectional structure of a back contact cell assembly provided in an embodiment of the present invention. FIG. 3 is another cross-sectional structural example of a back contact cell assembly provided in an embodiment of the present invention. FIG. 4 is another structural example of a back contact cell assembly provided in an embodiment of the present invention. FIG. 5 is another structural example of a back contact cell assembly provided in an embodiment of the present invention. Figure 6 is an example diagram of the structure of a photovoltaic system provided in an embodiment of the present invention. FIG. 7 is an example diagram of the structure of a serial cell string group provided in an embodiment of the present invention. FIG. 8 is an example cross-sectional structure of an edge portion busbar embedded structure provided in an embodiment of the present invention. FIG. 9 is an example diagram of the structure of a cell string provided in an embodiment of the present invention. FIG. 10 is another structural example of a back contact cell assembly provided in an embodiment of the present invention. FIG. 11 is an example diagram of the structure of a parallel cell string group (adjacent cell plates are located in the same plane) provided in an embodiment of the present invention. FIG. 12 is an example of another cross-sectional structure of an edge portion busbar embedded structure provided in an embodiment of the present invention. FIG. 13 is another cross-sectional structure example of an edge portion busbar embedded structure provided in an embodiment of the present invention. FIG. 14 is an example diagram of the structure of a serial cell string group (adjacent cell plates are stacked) provided in an embodiment of the present invention. FIG. 15 is an example of another cross-sectional structure of an edge portion busbar embedded structure provided in an embodiment of the present invention. FIG. 16 is an example diagram of the structure of a parallel cell string group (adjacent cell plates are stacked) provided in an embodiment of the present invention. FIG. 17 is an example of a cross-sectional structure of an intermediate busbar embedded structure provided in an embodiment of the present invention. FIG. 18 is another cross-sectional structural example of an intermediate busbar embedded structure provided in an embodiment of the present invention. FIG. 19 is another cross-sectional structural example of an edge portion busbar embedded structure provided in an embodiment of the present invention. FIG. 20 is another cross-sectional structure example of an edge portion busbar embedded structure provided in an embodiment of the present invention. FIG. 21 is another cross-sectional structure example of an edge portion busbar embedded structure provided in an embodiment of the present invention. FIG. 22 is another cross-sectional structure example of an edge portion busbar embedded structure provided in an embodiment of the present invention. FIG. 23 is an example of another cross-sectional structure of an intermediate busbar embedded structure provided in an embodiment of the present invention. FIG. 24 is another cross-sectional structural example of an intermediate busbar embedded structure provided in an embodiment of the present invention. Specific details for implementing the invention

[0129] To facilitate a clearer understanding of the objectives, technical solutions, and advantages of the present invention, the invention is described in more detail below in combination with the drawings and embodiments. Examples of the embodiments are illustrated in the attached drawings, where identical or similar symbols are used to denote identical or similar elements or elements having identical or similar functions from beginning to end. The embodiments described below with reference to the attached drawings are exemplary and are used only to explain the invention and should not be understood as a limitation to the invention. Furthermore, it should be understood that the specific embodiments described herein are used only to explain the invention and are not intended to limit the invention.

[0130] In the description of the present invention, it should be understood that the directional or positional relationships indicated by terms such as "length," "width," "upper," "lower," "left," "right," "horizontal," "top," "bottom," etc., are based on the directional or positional relationships depicted in the attached drawings. This is merely intended to facilitate the explanation of the invention and to simplify the description; it does not indicate or imply that the device or element indicated must have a specific direction or be configured and operated in a specific direction, and therefore should not be understood as a limitation to the present invention.

[0131] In the description of the present invention, terms such as "first," "second," "third," "fourth," etc. are used merely for illustrative purposes and should not be understood as indicating or implying relative importance, or as implicitly indicating the quantity of technical features. Accordingly, features limited by "first," "second," "third," "fourth," etc., may explicitly or implicitly include one or more of the said features. In the description of the present invention, "multiple" and "specific number" mean two or more, unless otherwise specified and specifically limited.

[0132] In the description of the present invention, unless otherwise clearly specified and limited, the terms “mounting,” “connecting with one another,” and “connection” should be understood in a broad sense and, for example, may be a fixed connection, a detachably connected connection, or an integral connection; may be a mechanical connection, an electrical connection, or a form of mutual communication; may be a direct connection or an indirect connection via an intermediate medium; or may be communication within two elements or an interactive relationship between two elements. Those skilled in the art will understand the specific meaning of the aforementioned terms in the present invention according to the specific circumstances.

[0133] In the present invention, unless otherwise clearly specified and limited, the positioning of a first feature on the "upper" or "lower" of a second feature may include direct contact between the first feature and the second feature, or it may include contact between the first feature and the second feature through another feature between them rather than direct contact. Additionally, the positioning of a first feature on the "upper," "upper," and "upper surface" of a second feature includes the first feature being positioned immediately above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than the horizontal height of the second feature. The positioning of a first feature on the "lower," "lower," and "lower surface" of a second feature includes the first feature being positioned immediately below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than the horizontal height of the second feature.

[0134] The disclosure described below provides numerous different embodiments or examples to embody different structures of the present invention. To simplify the disclosure of the present invention, specific examples of components and installations are described below. Of course, these are merely examples and are not intended to limit the present invention. Furthermore, the present invention may duplicate reference numbers and / or reference letters in different examples; such duplication is for the purpose of simplification and clarification and does not, in itself, indicate a relationship between the various embodiments and / or settings discussed. Additionally, while the present invention has provided examples of various specified processes and materials, those skilled in the art will be able to recognize applications of other processes and / or usage scenarios of other materials.

[0135] In related technologies, if the busbar is exposed to the outside, it affects the aesthetics of the cell plate and reduces the light-receiving area of ​​the cell plate, resulting in poor power generation efficiency. In the present invention, the busbar is concealed on the light-receiving surface of a plurality of cell plates, so the busbar cannot be observed from one side of the light-receiving surface, thereby unifying the overall color of the front of the back-contact cell assembly and improving its aesthetics. At the same time, an insulating strip can be installed between the busbar and the cell plate, preventing the occurrence of short-circuit problems.

[0136] Next, compared to installing a busbar at an intermediate position on the back of a cell plate, the busbar of the present invention is installed at one end of a first cell plate close to a second cell plate, and the second welding ribbon is installed on the second cell plate, so that the second welding ribbon can be sufficiently bonded and welded to the effective welding position of the second cell plate, and prevent the welding of the second welding ribbon and the second cell plate from being insufficient due to the installation of the busbar, thereby preventing the current collection from being affected. At the same time, after the second welding ribbon is welded to the second cell plate, it can be directly connected to the busbar without the need to perform an opening process on the insulation strip or replace it with an intermittently installed insulation block, and during assembly, only the entire insulation strip needs to be placed at one end of the first cell plate close to the second cell plate, thereby effectively reducing the production precision requirements and production difficulty, and preventing short circuits caused by position shifts when performing an opening on the insulation strip or when laminating the insulation block, thereby increasing the product yield.

[0137] The present invention is further described below in combination with the drawings and embodiments.

[0138] Example 1

[0139] Referring to FIGS. 1, 2 and 3, the back contact cell assembly (1100) provided in the present invention comprises a cell string (110), an insulating strip (120), and a bus bar (130). The cell string (110) comprises a plurality of serially arranged cell plates (111), the plurality of cell plates (111) are distributed along a first direction, and the insulating strip (120) is installed on the light distribution surface (1113) of the cell plates (111) along a second direction, wherein the first direction and the second direction are set to intersect, and the bus bar (130) is installed on one side of the insulating strip (120) far from the cell plates (111) along the second direction, and the insulating strip (120) covers the surface of one side of the bus bar (130) close to the cell plates (111);

[0140] The cell string (110) includes adjacent first cell plates (1111) and second cell plates (1112), and an insulating strip (120) is installed on the light distribution surface (1113) of the first cell plate (1111), and a second welding ribbon (142) connects the second cell plate (1112) and the bus bar (130) respectively, and the insulating strip (120) isolates the second welding ribbon (142) and the first cell plate (1111).

[0141] In this embodiment, the insulating strip (120) and the bus bar (130) are both installed along a second direction, and the insulating strip (120) covering the bus bar (130) indicates that when viewed from the direction of the light-dispatch surface (1113) of the cell plate (111), the projection of the bus bar (130) is completely located inside the insulating strip (120), or when viewed from the direction of the light-input surface (1114) of the cell plate (111), the insulating strip (120) can completely shield the bus bar (130), thereby preventing the bus bar (130) from being exposed. At the same time, the bus bar (130) and the insulating strip (120) can be installed on the light distribution surface (1113) of the cell plate (111) to prevent them from affecting the light receiving surface (1114) of the cell plate (111), thereby making the light receiving area (1114) of the cell plate (111) larger and increasing the power generation efficiency.

[0142] Here, the specifications of the first cell plate (1111) and the second cell plate (1112) may be the same or different; and the structures of the first cell plate (1111) and the second cell plate (1112) may be the same or different. Here, the specific relationship between the first cell plate (1111) and the second cell plate (1112) is not limited.

[0143] It can be understood that the “first” and “second” in the first cell plate (1111) and the second cell plate (1112) are relative concepts, indicating that the two back contact cells are different. For example, in the examples of FIGS. 2 and 3, the back contact cell on the left is the first cell plate (1111), and the back contact cell on the right is the second cell plate (1112).

[0144] The busbar (130) is installed on the first cell plate (1111), and the busbar (130) and the first cell plate (1111) are separated by an insulating strip (120). On one side, there is no need to leave space in advance for the busbar (130) at the edge of the cell assembly, so more space can be left for mounting the cell plate (111) in the cell assembly, thereby increasing the effective light-receiving area of ​​the cell assembly and increasing the assembly switching efficiency. On the other side, when viewed from the direction of the light-receiving surface of the cell plate (111), the insulating strip (120) can shield the busbar (130), preventing the busbar (130) from being exposed, thereby improving the overall aesthetics of the cell assembly. At the same time, the insulating strip (120) can be installed between the busbar (130) and the cell plate, thereby preventing short circuit problems.

[0145] In addition, compared to installing a busbar at an intermediate position on the back of a cell plate, the busbar (130) of the present invention is installed at one end of the first cell plate (1111) close to the second cell plate (1112), and the second welding ribbon (142) is installed on the second cell plate (1112), so that the second welding ribbon (142) can be sufficiently bonded and welded to the effective welding position of the second cell plate (1112), and prevent the welding of the second welding ribbon (142) and the second cell plate (1112) from becoming insufficient due to the mounting of the busbar (130) and thus affecting the collection of current, and at the same time, after the second welding ribbon (142) is welded to the second cell plate (1112), it can be directly connected to the busbar (130) without the need to perform an opening treatment on the insulation strip (120) or replace it with an intermittently installed insulation block, and during assembly, only the entire single insulation strip (120) is the second cell Since it only needs to be placed on one end of the first cell plate (1111) close to the plate (1112), the production precision requirement and production difficulty are effectively reduced, and a short circuit is prevented due to position shift when performing an opening on the insulation strip (120) or position shift when laminating the insulation block, thereby increasing the product yield.

[0146] The insulating strip (120) of this embodiment is a long rod shape similar to the shape of a bus bar (130), and compared to general insulating members which are manufactured through methods such as groove opening, intermittent distribution, or drilling holes, the process of the insulating strip (120) of this embodiment is simpler and can save manufacturing time. The long rod-shaped insulating strip (120) also has characteristics such as a simpler laying process, lower requirements for precision and detail work of the equipment, and a higher production yield. As a result, the overall equipment and production manufacturing cost of the entire back contact cell assembly (1100) is minimized, and the reliability of the assembly is further improved.

[0147] Optionally, in an embodiment of the present invention, the busbar (130) may be an intermediate busbar, which is located at an intermediate position of the cell string (110). The busbar (130) may be an edge busbar, which is located at the edge of the cell string (110). Here, to satisfy various needs, the specific location and specific shape of the busbar (130) are not limited.

[0148] In this embodiment, a plurality of back contact cells in the back contact cell assembly (1100) can be sequentially serialized to form a cell string (110), thereby enabling serial current collection output, and serialization of cell plates (111) can be achieved by installing, for example, a welding ribbon (140) (bus bar (130), interconnect bar), a conductive back plate, etc.

[0149] It can be understood that, in this embodiment, the back contact cell assembly (1100) may also include a frame, a back plate, a solar glass, and an adhesive film. The adhesive film may be filled between the front and back of the back contact cell and the solar glass, adjacent cell plate (111), etc., and may be used as a filler. It may be a transparent adhesive having good light transmission performance and aging resistance performance. For example, the adhesive film may be an EVA adhesive film or a POE adhesive film, and the specifics may be selected according to the actual situation and are not limited thereto.

[0150] Solar glass can be covered over the front adhesive film of the back contact cell, and the solar glass can be ultra-white glass, which has high light transmittance and high transparency, and also has excellent physical, mechanical, and optical performance. For example, the light transmittance of the ultra-white glass can be 92% or higher, which can protect the back contact cell without affecting the efficiency of the back contact cell as much as possible. At the same time, the adhesive film can bond the solar glass and the back contact cell together, and the presence of the adhesive film can seal and insulate the back contact cell and make it waterproof and moisture-proof.

[0151] The back plate can be attached to the adhesive film on the back of the back contact cell, and the back plate can serve as a protective and supportive structure for the back contact cell and possess reliable insulation, water barrier properties, and aging resistance. The back plate may have various options and, generally, may be tempered glass, organic glass, aluminum alloy TPT composite adhesive film, etc., and may be installed specifically according to the specific situation, but is not limited thereto. The entire structure composed of the back plate, back contact cell, adhesive film, and solar glass can be installed in a frame, and the frame is used as the main external support structure for the entire back contact cell assembly (1100), and can perform stable support and mounting for the back contact cell assembly (1100), for example, the back contact cell assembly (1100) can be mounted in a position where it needs to be mounted through the frame.

[0152] In one example, if the busbar (130) is an edge busbar, the welding ribbon (140) welded to the busbar (130) is extended to the cell plate (111) of the last second row, and both the insulating strip (120) and the busbar (130) must be placed at the position of the cell plate (111) of the last second row, close to the cell plate (111) of the last row. The width of the insulating strip (120) is greater than the width of the busbar (130). The edge of the insulating strip (120) must not exceed the overlap gap and must not shield the effective welding position of the cell plate (111) of the last row.

[0153] In another example, if the busbar (130) is an intermediate busbar, the welding ribbon (140) welded to the busbar (130) is extended to the cell plate (111) of the last second row of the power generation unit, and both the insulation strip (120) and the busbar (130) must be placed at the position of the cell plate (111) of the last second row close to the cell plate (111) of the last row. The width of the insulation strip (120) is greater than the width of the busbar (130). The edge of the insulation strip (120) must not exceed the overlap gap and must not shield the effective welding position of the cell plate (111) of the last row.

[0154] It can be understood that in the cell string (110), the cell string (110) may include two cell plates (111) in series, three cell plates (111) in series, or a larger number of other cell plates (111), and specifically, the number of cell plates (111) to be serialized can be determined according to the actual usage situation.

[0155] In an embodiment of the present invention, the size and type of the bus bar (130) and the insulating strip (120) are not limited, and to satisfy different needs, the insulating strip (120) only needs to cover the bus bar (130).

[0156] Example 2

[0157] Referring to FIG. 1, in some optional embodiments, the insulating strip (120) covers the bus bar (130) in the second direction, and the insulating strip (120) covers and exceeds the bus bar (130) in the first direction.

[0158] Thus, the plane in which the light distribution surface (1113) of the cell plate (111) is located in the first direction and the second direction can be determined, so that when the insulating strip (120) and the bus bar (130) are attached to the light distribution surface (1113) of the cell plate (111), the insulating strip (120) can be isolated from the bus bar (130) and the cell plate (111) to which the insulating strip (120) is attached, thereby preventing a short circuit from occurring between the two.

[0159] Example 3

[0160] Referring to FIGS. 1, 2 and 3, in some optional embodiments, the back contact cell assembly (1100) further comprises a welding ribbon (140), the welding ribbon (140) comprises a first welding ribbon (141) and a second welding ribbon (142), the first welding ribbon (141) is for connecting adjacent cell plates (111), and the second welding ribbon (142) is for connecting cell plates (111) and busbars (130).

[0161] In an embodiment of the present invention, the welding ribbon (140) may be for connecting two adjacent cell plates (111) and may be for connecting adjacent cell plates (111) and a bus bar (130). In other words, the welding ribbon (140) for connecting two adjacent cell plates (111) is the first welding ribbon (141), and the welding ribbon (140) for connecting cell plates (111) and a bus bar (130) is the second welding ribbon (142). The first welding ribbon (141) is for electrically connecting adjacent cell plates (111), and the first welding ribbon (141) is for electrically connecting adjacent cell plates (111) and a bus bar (130).

[0162] Specifically, the welding ribbon (140) may include a copper chip and a tin layer covering the copper chip. The tin layer may cover the entire surface or a portion of the surface of the copper chip. For example, the tin layer may cover the entire surface of the copper chip facing the cell plate (111) and the entire surface far from the cell plate (111), and not cover the sides of the copper chip. Also, for example, the tin layer covers the entire surface of the copper chip.

[0163] Optionally, in embodiments of the present invention, the specific type of the tin layer is not limited to satisfy various needs. For example, the tin layer may be a tin single-element layer or a tin alloy layer. The tin alloy layer comprises at least one of a SnPb layer, a SnBi layer, and a SnAg layer, but is not limited thereto.

[0164] In addition, in an embodiment of the present invention, the size and type of the welding ribbon (140) are not limited to satisfy different demands.

[0165] Example 4

[0166] Referring to FIGS. 2 and 3, in some optional embodiments, the second welding ribbon (142) is installed on one side of the busbar (130) far from the insulating strip (120), or the second welding ribbon (142) is installed on one side of the busbar (130) close to the insulating strip (120).

[0167] In one embodiment, the second welding ribbon (142) is installed on one side of the bus bar (130) away from the insulating strip (120), thereby making it easier to weld the second welding ribbon (142), and the edge of the second welding ribbon (142) can be welded directly to a surface exposed to the outside of the bus bar (130).

[0168] In another embodiment, the second welding ribbon (142) is installed on one side of the bus bar (130) near the insulating strip (120), and the edge portion of the second welding ribbon (142) is clamped between the bus bar (130) and the insulating strip (120) so that the bus bar (130) can be more stably connected to the second welding ribbon (142). In addition, the second welding ribbon (142) is installed on one side of the bus bar (130) near the insulating strip (120), that is, the edge portion of the second welding ribbon (142) is installed between the bus bar (130) and the insulating strip (120), thereby making the height difference between the second welding ribbon (142) and the cell plate (111) smaller, so that the welding effect with the cell plate (111) can be improved.

[0169] Example 5

[0170] Referring to FIGS. 1, 2 and 3, in some optional embodiments, the first cell plate (1111) and the second cell plate (1112) are installed at least partially stacked.

[0171] Thus, a larger light-receiving surface (1114) may exist in the back contact cell assembly (1100), thereby preventing the gap between the first cell plate (1111) and the second cell plate (1112) from exposing components such as the welding ribbon (140) and the bus bar (130).

[0172] In an embodiment of the present invention, the specific locations of the first cell plate (1111) and the second cell plate (1112) are not limited to satisfy different demands. In one embodiment, the edges of the first cell plate (1111) and the second cell plate (1112) are installed at least partially stacked; in another embodiment, the second cell plate (1112) and the first cell plate (1111) may be installed spaced apart. If the gap between the second cell plate (1112) and the first cell plate (1111) is within an appropriate range, problems such as a small workspace and high welding difficulty caused by an excessively small gap can be prevented, and waste of assembly space and increased costs caused by an excessively large gap can also be prevented.

[0173] Example 6

[0174] Referring to FIGS. 1 and 2, in some optional embodiments, when the light-dispatch surface (1113) of the first cell plate (1111) and the light-input surface (1114) of the second cell plate (1112) are at least partially laminated, the insulating strip (120) is partially connected to the light-dispatch surface (1113) of the second cell plate (1112).

[0175] In this embodiment, the light-dispatch surface (1113) of the first cell plate (1111) and the light-input surface (1114) of the second cell plate (1112) are connected together so that there is no gap between the first cell plate (1111) and the second cell plate (1112), and an insulating strip (120) is installed on the light-dispatch surface (1113) of the first cell plate (1111), and also the edge portion of the insulating strip (120) close to the second cell plate (1112) is adhered to the light-dispatch surface (1113) of the second cell plate (1112). At this time, the welding ribbon (140) located on the light distribution surface (1113) of the second cell plate (1112) is isolated by an insulating strip (120) so that the welding ribbon (140) can be stably connected to the bus bar (130) and prevent short circuit between the first cell plate (1111) and the welding ribbon (140) or the bus bar (130).

[0176] In other embodiments, the light-receiving surface (1114) of the first cell plate (1111) and the light-discharging surface (1113) of the second cell plate (1112) may also be at least partially laminated, but are not specifically limited thereto.

[0177] Example 7

[0178] Referring to FIGS. 1, 4 and 5, in some optional embodiments, the cell plate (111) is rectangular, and the cell plate (111) further includes a chamfered edge (1115) and a cutting edge (1116), the chamfered edge (1115) and the cutting edge (1116) are both distributed on both sides of the cell plate (111) along a first direction, and the first direction and the second direction are set to be perpendicular.

[0179] The insulating strip (120) and the bus bar (130) may both be rectangular, and the first direction and the second direction may be vertical, so that this small rectangle called the bus bar (130) is located inside the large rectangle called the insulating strip (120). The cell plate (111) may include parallel chamfered edges (1115) and cutting edges (1116), and the extension directions of the chamfered edges (1115) and cutting edges (1116) are both the second direction, and the chamfered edge (1115) is an edge that has chamfers installed at both ends.

[0180] In an embodiment of the present invention, the positions of the chamfered edge (1115) and the cutting edge (1116) are not limited to satisfy different demands. In one embodiment, the cell plate (111) may be vertically distributed, that is, the first direction is vertically vertical, and the cell plate (111) may be distributed in a shape where the chamfered edge (1115) is at the top and the cutting edge (1116) is at the bottom; or the cell plate (111) may be distributed in a shape where the cutting edge (1116) is at the top and the chamfered edge (1115) is at the bottom.

[0181] In this embodiment, the manufacturing process of the cell plate (111) is not limited to satisfy different demands. For example, the cell plate (111) may be formed by cutting a large rectangular cell plate (111), and chamfers may be formed at four corners before cutting, and then two formed cell plates (111) may be formed by cutting along the middle position, and the cell plate (111) has parallel chamfer edges (1115) and cutting edges (1116).

[0182] Example 8

[0183] Referring to FIGS. 4 and 5, in some optional embodiments, in a first direction, the chamfered edge (1115) of the cell plate (111) and the chamfered edge (1115) of the cell plate (111) adjacent to it are installed as a docking connection, and the cutting edge (1116) of the cell plate (111) and the cutting edge (1116) of the cell plate (111) adjacent to it are installed as a docking connection; or

[0184] In the first direction, the cutting edge (1116) of the cell plate (111) adjacent to the chamfered edge (1115) of the cell plate (111) is installed as a docking connection, and the chamfered edge (1115) of the cell plate (111) adjacent to the cutting edge (1116) of the cell plate (111) is installed as a docking connection.

[0185] In one embodiment, adjacent cell plates (111) are installed symmetrically, and in the direction from left to right, the first cell plate (111) has the chamfered edge (1115) on the left and the cutting edge (1116) on the right; the first cell plate (111) has the cutting edge (1116) on the left and the chamfered edge (1115) on the right; the third cell plate (111) has the chamfered edge (1115) on the left and the cutting edge (1116) on the right, and is inferred in the same way. By making it easier to position the cell plates (111), the positions of the welding ribbon (140), the bus bar (130), and the insulation strip (120) can be determined according to the arrangement direction of the cell plates (111).

[0186] In another embodiment, the arrangement of the cell plates (111) is the same, and in the direction from left to right, the chamfered edge (1115) is placed on the left and the cutting edge (1116) is placed on the right. Multiple cell plates (111) are connected sequentially, and the cutting edge (1116) of the left cell plate (111) and the chamfered edge (1115) of the adjacent right cell plate (111) are installed as a docking connection. Of course, in this embodiment, left and right are relative concepts, and the chamfered edge (1115) may be placed on the right and the cutting edge (1116) may be placed on the right. This makes mounting the cell plates (111) easier.

[0187] Example 9

[0188] In one embodiment, as shown in FIG. 4, the chamfered edge (1115) of the cell plate (111) is installed laminated on the light distribution surface on the side where the cutting edge (1116) of the adjacent cell plate (111) is located, and the chamfered edge (1115) of the adjacent cell plate (111) described above is installed laminated on the light distribution surface (1113) on the side where the cutting edge (1116) of another cell plate (111) adjacent thereto is located.

[0189] That is, when observed from the direction of the light-receiving surface of the cell plate (111), all of the chamfered edges (1115) of any one cell plate (111) are installed stacked on the light-reducing surface on the side where the cutting edge (1116) of the cell plate (111) adjacent to the cell plate (111) is located.

[0190] In the lamination process of a cell assembly, since the direction in which the cell assembly receives pressure points from the light-receiving surface (1113) of the cell plate (111) to the light-receiving surface (1114), when there is local mutual stacking between adjacent cell plates (111), if the side where the cutting edge (1116) of the cell plate (111) is located is pressed onto the light-receiving surface (1113) of the chamfered edge (1115) of the cell plate (111) adjacent to the cell plate (111), the area at the corner position of the side where the cutting edge (1116) of the cell plate (111) is located, which is pressed on top, may be in a hollow state due to insufficient support from below, and since the cell plate (111) receives force unevenly during the lamination process, the risk of damage, potential cracking, etc. of the cell plate (111) is easily increased, but the chamfer of the cell plate (111) By using a method in which the edge (1115) is stacked on the light distribution surface on the side where the cutting edge (1116) of the adjacent cell plate (111) is located, and the chamfered edge (1115) of the adjacent cell plate (111) is stacked on the light distribution surface (1113) on the side where the cutting edge (1116) of the cell plate (111) is located, the chamfered edge (1115) of the cell plate (111) pressed on top receives force evenly, so there is no hollow area, which effectively reduces the risk of such damage, potential cracks, etc., and improves product yield and the reliability of the cell assembly.

[0191] Example 10

[0192] Referring to FIG. 6, the solar photovoltaic system (1200) provided in an embodiment of the present invention includes a back contact cell assembly (1100) of any one of the embodiments described above.

[0193] In a back contact cell assembly (1100) and a photovoltaic system (1200) of an embodiment of the present invention, the back contact cell assembly (1100) comprises a cell string (110), an insulating strip (120), and a bus bar (130). The cell string (110) comprises a plurality of serially arranged cell plates (111), the plurality of cell plates (111) are distributed along a first direction, and the insulating strip (120) is installed on the light distribution surface (1113) of the cell plates (111) along a second direction, wherein the first direction and the second direction are set to intersect, and the bus bar (130) is installed on one side of the insulating strip (120) far from the cell plates (111) along the second direction, and the insulating strip (120) covers the bus bar (130). Thus, the busbar (130) is hidden from the light-receiving surface (1113) of the plurality of cell plates (111), so the busbar (130) cannot be observed from one side of the light-receiving surface (1114), and the overall color of the front of the back contact cell assembly (1100) is unified and aesthetically pleasing. At the same time, an insulating strip (120) can be installed between the busbar (130) and the cell plates (111), thereby preventing the occurrence of short circuit problems.

[0194] In this embodiment, the solar power system (1200) can be applied to a solar power plant, for example, a ground power plant, a rooftop power plant, a floating power plant, etc., and can also be applied to equipment or devices that generate power using solar energy, for example, a user solar energy power source, a solar energy street light, a solar energy vehicle, a solar energy building, etc. Of course, it is understandable that the application scenarios of the solar power system (1200) are not limited thereto; in other words, the solar power system (1200) can be applied to any field that requires power generation using solar energy. Taking a solar power generation system network as an example, the solar power system (1200) may include a solar array, a junction box, and an inverter. The solar array may be an array combination of multiple cell assemblies, for example, multiple cell assemblies may constitute multiple solar arrays. The solar array is connected to a junction box, and the junction box can collect the current generated by the solar array. The collected current passes through an inverter to convert it into parallel electricity required by the commercial power grid, and then accesses the commercial power grid to implement solar energy power supply.

[0195] Example 11

[0196] Referring to FIGS. 7 through 9, the present embodiment discloses a back contact cell assembly, which comprises a cell string, a first insulating strip (221), a first busbar (231), and a second welding ribbon A (241).

[0197] A cell string comprises cell plates arranged in series with respect to each other, wherein the cell plates comprise a fifth cell plate (211) and a sixth cell plate (212) arranged along a first direction, wherein the fifth cell plate (211) is installed at the edge of the cell string;

[0198] The first insulating strip (221) is installed at one end of the sixth cell plate (212) near the fifth cell plate (211);

[0199] A first busbar (231) is installed on one side of a first insulating strip (221) oriented toward a sixth cell plate (212) (i.e., the back side of the first insulating strip (221); otherwise, the side of the first insulating strip (221) pointing toward the sixth cell plate (212) is the front side of the first insulating strip (221)), and both the first insulating strip (221) and the first busbar (231) are installed extending along a second direction, and the first direction and the second direction are set to intersect;

[0200] The second welding ribbon A (241) is for electrically connecting the first busbar (231) and the fifth cell plate (211);

[0201] Here, in the first direction, a first width extension section (2211) and a second width extension section (2212) are installed at both ends of the first insulation strip (221) and extend outside the edge of the first bus bar (231), and the first width extension section (2211) and the second width extension section (2212) are installed sequentially along a direction away from the fifth cell plate (211), and the width of the second width extension section (2212) is smaller than the width of the first width extension section (2211).

[0202] It can be understood that electrical connection methods may include welding, bonding via conductive adhesive, etc., but are not limited to these.

[0203] It can be understood that, in a cell string, the cell string may include two cell plates in series, three cell plates in series, or a larger number of other cell plates, and specifically, the number of cell plates to be serialized can be determined according to the actual usage situation.

[0204] In the present invention, the first bus bar (231) is an edge bus bar, and the fifth cell plate (211) is located at the edge of the cell string. For ease of explanation, in the present invention, the end where the fifth cell plate (211) is located is recorded as the tail end of the cell string, that is, in the first direction, the fifth cell plate (211) is the last cell plate of the cell string, and the sixth cell plate (212) is the last second cell plate of the cell string. It is not difficult to understand that the end where the fifth cell plate (211) is located may also be recorded as the head end of the cell string, and this is not repeated here.

[0205] Optionally, within the same cell string, adjacent cell plates can be connected in series using methods such as welding ribbons or conductive adhesives.

[0206] In one embodiment, adjacent cell plates are connected through a series welding ribbon (251) (in other embodiments, for example in Example 1, this is referred to as the “first welding ribbon”), specifically, the series welding ribbon (251) comprises a first series welding ribbon (2511) and a second series welding ribbon (2512), in a first direction, the first series welding ribbon (2511) and the second series welding ribbon (2512) are installed to intersect, and in a second direction, the first series welding ribbon (2511) and the second series welding ribbon (2512) are installed to intersect, and in one cell string, the Nth cell plate, the N+1th cell plate, and the N+2th cell plate (N is a positive integer greater than or equal to 1) are arranged sequentially along the first direction, wherein the positive welding point of the Nth cell plate and the negative welding point of the N+1th cell plate are connected in series through a plurality of first series welding ribbons (2511). The positive welding point of the N+1th cell plate and the negative welding point of the N+2th cell plate are connected in series through a plurality of second series welding ribbons (2512).

[0207] When assembled, each cell plate in the cell string is connected in series with each other, and the first insulating strip (221) is installed at one end of the sixth cell plate (212) near the fifth cell plate (211), and the first bus bar (231) is installed on the back of the first insulating strip (221), and the main body of the second welding ribbon A (241) and the effective welding position of the fifth cell plate (211) are electrically connected, and the one end of the second welding ribbon A (241) near the sixth cell plate (212) and the first bus bar (231) are electrically connected so that the first bus bar (231) can draw current from the cell string.

[0208] First, in the present invention, the first busbar (231) is installed on the sixth cell plate (212), and the first busbar (231) and the sixth cell plate (212) are separated by the first insulating strip (221). In one aspect, there is no need to leave space in advance for the busbar at the edge of the cell assembly, so more space can be left for mounting the cell plate in the cell assembly, thereby increasing the effective light-receiving area of ​​the cell assembly and increasing the assembly switching efficiency. In another aspect, when viewed from the direction of the light-receiving surface (or referred to as the “front”) of the cell plate, the first insulating strip (221) can shield the first busbar (231), preventing the first busbar (231) from being exposed and further improving the overall aesthetics of the cell assembly.

[0209] Next, compared to installing a busbar at an intermediate position on the back of a cell plate, the first busbar (231) of the present invention is installed at one end of the sixth cell plate (212) near the fifth cell plate (211), so that the second welding ribbon A (241) can be sufficiently bonded and welded to the effective welding position of the fifth cell plate (211), and prevent the welding between the second welding ribbon A (241) and the fifth cell plate (211) from becoming insufficient due to the mounting of the first busbar (231) and affecting the collection of current, and at the same time, after the second welding ribbon A (241) is welded to the fifth cell plate (211), it can be directly connected to the first busbar (231) without the need to perform an opening treatment on the insulating strip or replace it with an intermittently installed insulating block, and during assembly, simply placing the entire first insulating strip (221) at one end of the sixth cell plate (212) near the fifth cell plate (211) Therefore, it effectively reduces production precision requirements and production difficulty, and prevents short circuits caused by position shifts when opening insulation strips or when laminating insulation blocks, thereby increasing product yield.

[0210] At the same time, the first insulation strip (221) of the present invention is provided with a first width extension section (2211) and a second width extension section (2212), that is, on both sides of the first insulation strip (221) in the first direction, a width extension portion exceeding the edge of the first bus bar (231) is left.The installation of the first width expansion section (2211) and the second width expansion section (2212) allows, in one aspect, for a certain degree of shift in the width direction to exist during the manufacturing process with respect to the first insulation strip (221) with respect to the first busbar (231) and with respect to the two cell plates, thereby reducing the production precision requirements and production difficulty; In another aspect, the second width extension section (2212) of the first insulation strip (221) of the present invention is smaller than the first width extension section (2211), that is, in the first direction, the first busbar (231) is installed at an angle rather than symmetrically with respect to the center of the first insulation strip (221), and such installation forms a relatively wide first width extension section (2211) and a relatively narrow second width extension section (2212), wherein the relatively wide first width extension section (2211) is advantageous for covering a larger area of ​​the fifth cell plate (211) edge and the sixth cell plate (212) edge than the first width extension section (2211), thereby better reducing the risk of the first busbar (231) coming into contact with an anisotropic welding ribbon or anisotropic grid line on the fifth cell plate (211) and causing a short circuit, and the second welding ribbon A (241) and The risk of a short circuit caused by contact between the anisotropic welding ribbon or anisotropic grid line of the sixth cell plate (212) is reduced, and the risk of a short circuit easily caused by conductive foreign matter such as tin slag during the manufacturing process is also reduced, and the reliability of the cell assembly is improved; the relatively narrow second width extension section (2212) can ensure that the aforementioned production precision requirements and the risk of a short circuit are reduced, and at the same time, since the second width extension section (2212) reduces the influence on the double-sided efficiency of the cell assembly, the cell assembly is ensured to have a relatively high double-sided efficiency.

[0211] Additionally, if the busbar is installed on the outer edge of the last cell plate of the cell string, that is, at one end of the fifth cell plate (211) far from the sixth cell plate (212), the outer edge of the last cell plate of the cell string is close to the edge of the cell assembly, and thus the stress at the above location during lamination is relatively large, so defects such as breakage are easily generated, and at the same time, since the mounting of the busbar can affect the welding between the second welding ribbon A (241) and the fifth cell plate (211), the second welding ribbon A (241) cannot weld to the fifth cell plate (211) at the location shielded by the busbar, resulting in insufficient welding between the second welding ribbon A (241) and the fifth cell plate (211), poor current collection, and this situation is particularly severe if the cell assembly is a back contact cell assembly without a main grid.

[0212] Relatively speaking, the edge portion busbar embedded structure of the present invention can be applied to a back contact cell assembly containing a main grid and a back contact cell assembly not containing a main grid, thus having greater versatility. Additionally, since the stress during lamination is smaller at one end of the sixth cell plate (212) near the fifth cell plate (211) compared to the outer edge of the last cell plate of the cell string, the risk of breakage or cracking can be reduced, thereby further improving the reliability of the cell assembly.

[0213] In some embodiments, referring to FIG. 8, the first width extension section (2211) extends at least partially outside the edge of the sixth cell plate (212). This allows the first insulation strip (221) to cover more of the area of ​​the fifth cell plate (211) edge and the sixth cell plate edge, on the basis that the first insulation strip (221) has a certain degree of shift in the width direction during manufacturing with respect to the first bus bar (231) and the first insulation strip (221) has a certain degree of shift in the width direction with respect to the two cell plates, thereby reducing the risk of a short circuit caused by contact between the first bus bar (231), the second welding ribbon A (241), and the anisotropic welding ribbon or anisotropic grid line, and improving the reliability of the cell assembly.

[0214] In some embodiments, referring to FIG. 8, in the first direction, the orthographic projection of the first width extension section (2211) in the thickness direction of the sixth cell plate (212) and the orthographic projection of the fifth cell plate (211) in the thickness direction of the sixth cell plate (212) overlap at least partially.

[0215] This allows the first insulating strip (221) to cover the edges of the sixth cell plate (212) and the fifth cell plate (211), thereby preventing the anisotropic welding ribbon or anisotropic grid line on the first bus bar (231) from coming into contact with the fifth cell plate (211) and causing a short circuit, and also prevents the anisotropic welding ribbon or anisotropic grid line on the second welding ribbon A (241) from coming into contact with the sixth cell plate (212) and causing a short circuit, thereby further reducing the risk of a short circuit.

[0216] In particular, when a cell plate is cut in half, a short circuit is easily caused after the cutting edge is cut. However, the installation of the first width extension section (2211) of the present invention can effectively prevent a short circuit easily caused by the cutting edge, thereby ensuring the reliability of the cell assembly by installing the cutting edge of the cell half edge on the side where the first bus bar (231) on the cell plate is located or on one side of an adjacent cell plate close to the first bus bar (231).

[0217] In some embodiments, referring to FIG. 8, optionally, in the first direction, the width D2 of the second width extension section (2212) is ≥1mm.

[0218] If the second width expansion section (2212) is excessively small, the amount of shift allowed in the first insulation strip (221) during the manufacturing process is small, thereby increasing the production precision requirements. If the width of the second width expansion section (2212) of this embodiment is controlled to ≥1mm, sufficient shift space can be left in advance for the horizontal tolerance of equipment placement during the manufacturing process and the tolerance of busbar shift during the lamination process, thereby lowering the production precision requirements.

[0219] In some embodiments, referring to FIG. 8, the fifth cell plate (211) and the sixth cell plate (212) are installed on the same plane, where,

[0220] 1mm<D1≤l 11 +l 12 +l 13 And,

[0221] In the formula, D1 is the width of the first width extension section (2211) in the first direction, and l 11 is the relative width distance between the edge of one end of the sixth cell plate (212) near the fifth cell plate (211) from the first busbar (231) in the first direction, and l 12is the gap between the 5th cell plate (211) and the 6th cell plate (212), and l 13 The relative width distance from the edge of one end of the fifth cell plate (211) near the sixth cell plate (212) to the first welding point (261) is installed at one end of the fifth cell plate (211) near the sixth cell plate (212) to be connected to the second welding ribbon A (241).

[0222] What can be understood is, l 11 +l 12 >1mm and l 11 By controlling it so that D1 > 1mm, the first width extension section (2211) can be secured to extend and cover the edge area of ​​the fifth cell plate (211) and the edge area of ​​the sixth cell plate (212), while leaving sufficient shift space for the horizontal tolerance of equipment placement during the manufacturing process and the tolerance for shifting of the busbar during the lamination process, thereby allowing the first insulating strip (221) to have a small width shift in the width direction with respect to the first busbar (231) and the first insulating strip (221) to have a small width shift with respect to the two cell plates.

[0223] It can be understood that the first welding point (261) is located at the edge closest to the sixth cell plate (212) at the effective welding position of the fifth cell plate (211) (i.e., the connection point of the edge of the second welding ribbon A (241) in the fifth cell plate (211)), and the first welding point (261) may be a grid line, a welding pad, but is not limited thereto.

[0224] If the width of the first width expansion section (2211) is excessively small, the risk of a short circuit increases and the reliability of the cell assembly decreases; as the width of the first width expansion section (2211) increases, the reliability of the cell assembly increases, and the displacement shift in the width direction of the first insulation strip (221) regarding the first busbar (231) and the first insulation strip (221) regarding the two cell plates allowed during the manufacturing process increases, and the production precision requirement decreases. However, if the width of the first width expansion section (2211) is excessively large, it affects sufficient welding between the second welding ribbon A (241) and the fifth cell plate (211), thereby reducing the current collection effect and affecting the double-sided efficiency rate of the cell assembly. Therefore, in this embodiment, 1mm < D1 ≤ l 11 +l 12 +l 13 By controlling it in this way, on the basis of ensuring that a certain shift exists during the manufacturing process of the first insulating strip (221), it is possible to ensure that the first width extension section (2211) of the first insulating strip (221) further extends and covers the edge area of ​​the fifth cell plate (211) and the edge area of ​​the sixth cell plate (212), thereby further improving the reliability and production yield of the cell assembly and reducing the production precision requirements, while at the same time preventing the sufficient welding between the second welding ribbon A (241) and the effective welding position of the fifth cell plate (211) from being affected, and also preventing unnecessary material waste and loss of double-sided efficiency.

[0225] In one embodiment, in the first direction, one end of the first bus bar (231) near the fifth cell plate (211) extends outside the edge of the sixth cell plate (212).

[0226] In another embodiment, referring to FIG. 8, in the first direction, the orthographic projection of the first busbar (231) in the thickness direction of the sixth cell plate (212) is located within the sixth cell plate (212), that is, the first busbar (231) is installed within the edge of the sixth cell plate (212).

[0227] In some embodiments, with reference to FIGS. 7, 9 and 10, the cell assembly comprises at least one serial cell string group (2100), and the same serial cell string group (2100) comprises two cell strings arranged along a second direction and installed serially with each other, and in the same serial cell string group (2100), extends from a sixth cell plate (212) of one cell string to a sixth cell plate (212) of another cell string through the same first busbar (231).

[0228] Optionally, the second welding ribbon A (241) includes a first anode welding ribbon (2411) and a first cathode welding ribbon (2412), and the same first busbar (231) is electrically connected to the first anode welding ribbon (2411) of one cell string and electrically connected to the first cathode welding ribbon (2412) of another cell string to form a series between adjacent cell strings.

[0229] For example, the same series cell string group (2100) includes a first cell string (210A) and a second cell string (210B), and the second welding ribbon A (241) includes a first anode welding ribbon (2411) and a first cathode welding ribbon (2412), and in the same series cell string group (2100), the same first busbar (231) extends from a sixth cell plate (212) in the first cell string (210A) to a sixth cell plate (212) in the second cell string (210B), and in the first cell string (210A), the first busbar (231) is electrically connected to the first anode welding ribbon (2411) on the fifth cell plate (211), and in the second cell string (210B), the first busbar (231) is connected to the fifth cell plate (211) It is electrically connected to the first cathode welding ribbon (2412) above.

[0230] Here, in one embodiment, the cell assembly includes a parallel cell string group (2200), and the same parallel cell string group (2200) includes at least two cell strings arranged along a first direction and installed in parallel with each other, and a spacing area is installed between the two cell strings installed in parallel with each other, and an intermediate busbar (232) is installed in the spacing area, and the intermediate busbar (232) is for parallelizing two cell strings installed adjacently in the first direction, that is, the edge portion busbar embedded structure of the present invention can be fitted to a general intermediate busbar (232) mounting structure.

[0231] In another embodiment, referring to FIGS. 10 and 11, a fourth cell plate (214) is installed at one end of each cell string far from the fifth cell plate (211), and a third cell plate (213) is installed at one end of the fourth cell plate (214) close to the fifth cell plate (211);

[0232] The back contact cell assembly further includes a second insulating strip (222) and an intermediate busbar (232), and

[0233] The second insulating strip (222) is installed on the edge of the third cell plate (213) in the cell string, and the second insulating strip (222) is installed at one end of the third cell plate (213) near the fourth cell plate (214);

[0234] An intermediate busbar (232) is for parallelizing two cell strings installed adjacently in a first direction, and the intermediate busbar (232) is installed on one side of a second insulating strip (222) oriented toward a third cell plate (213), and both the second insulating strip (222) and the intermediate busbar (232) are installed extending along a second direction;

[0235] Here, the second welding ribbon B (242) is intended to electrically connect the intermediate busbar (232), the fourth cell plate (214) in the cell string, and the fourth cell plate (214) in another cell string adjacent to the cell string in the first direction.

[0236] For example, for ease of explanation, a third cell string (220A) and a fourth cell string (220B) parallel to each other in the same parallel cell string group (2200) are given as examples, wherein the third cell string (220A) is the cell string where the intermediate busbar (232) is located.

[0237] The third cell plate (213) in the third cell string (220A) is recorded as the third cell plate (213A), and the fourth cell plate (214) is recorded as the fourth cell plate (214A); the third cell plate (213) in the fourth cell string (220B) is recorded as the third cell plate (213B), and the fourth cell plate (214) is recorded as the fourth cell plate (214B); the third cell string (220A) and the fourth cell string (220B) are arranged along a first direction, and the fourth cell plate (214A) and the fourth cell plate (214B) are installed adjacently in the first direction;

[0238] The back contact cell assembly further includes a second insulating strip (222), an intermediate busbar (232), and a second welding ribbon B (242), and

[0239] The second insulating strip (222) is installed on the edge of the third cell plate (213A) in the third cell string (220A), and the second insulating strip (222) is installed at one end of the third cell plate (213A) near the fourth cell plate (214A);

[0240] An intermediate busbar (232) is for parallelizing the third cell string (220A) and the fourth cell string (220B), and the intermediate busbar (232) is installed on one side of the second insulating strip (222) oriented on the third cell plate (213), and both the second insulating strip (222) and the intermediate busbar (232) are installed extending along the second direction;

[0241] The second welding ribbon B (242) is intended to electrically connect the intermediate busbar (232), the fourth cell plate (214A), and the fourth cell plate (214B), that is, the same second welding ribbon B (242) extends sequentially from the fourth cell plate (214B) to the fourth cell plate (214A) and the intermediate busbar (232).

[0242] Optionally, the second welding ribbon B (242) includes a second anode welding ribbon (2421) and a second cathode welding ribbon (2422), and the fourth cell plate (214A), the fourth cell plate (214B), and the intermediate busbar (232) are electrically connected through the second anode welding ribbon (2421) or the second cathode welding ribbon (2422).

[0243] The structure of the intermediate busbar (232) of the present invention, in one aspect, can increase the effective light-receiving area of ​​the cell assembly and improve assembly switching efficiency, and prevents the intermediate busbar (232) from being exposed to the outside, thereby further improving the overall aesthetics of the cell assembly; in another aspect, it can ensure that the second welding ribbon B (242) is sufficiently bonded and welded to the effective welding position of the fourth cell plate (214), thereby preventing the welding between the second welding ribbon B (242) and the fourth cell plate (214) from becoming insufficient due to the mounting of the intermediate busbar (232) and affecting the collection of current, and during assembly, only one entire first insulating strip (221) needs to be placed at one end of the third cell plate (213) close to the fourth cell plate (214). In addition, the intermediate busbar (232) embedded structure of the present invention can be applied to a back contact cell assembly containing a main grid and a back contact cell assembly not containing a main grid, thus providing greater versatility. Furthermore, since the stress during lamination of the intermediate busbar (232) embedded structure is smaller, the risk of potential cracking or breakage of the cell plate can be reduced, thereby improving the reliability of the back contact cell assembly.

[0244] The edge busbar embedded structure of the present invention is fitted to the intermediate busbar (232) embedded structure of the present invention, thereby increasing the effective light-receiving area of ​​the cell assembly, improving assembly switching efficiency, improving the overall aesthetics and reliability of the cell assembly, effectively reducing production precision requirements and production difficulty, and improving production efficiency.

[0245] In some embodiments, with reference to FIGS. 10 and FIGS. 11, in a first direction, a first outer extension section (2221) and a second outer extension section (2222) are installed at both ends of the second insulating strip (222) extending outside the edge of the intermediate busbar (232), and the first outer extension section (2221) and the second outer extension section (2222) are installed sequentially along a direction away from the fourth cell plate (214), and the first outer extension section (2221) extends at least partially outside the edge of the third cell plate (213), and the width of the second outer extension section (2222) is smaller than the width of the first outer extension section (2221).

[0246] By installing the first external extension section (2221) and the second external extension section (2222) of the second insulation strip (222), on one side, a certain degree of shift in the width direction is allowed during the manufacturing process with respect to the intermediate busbar (232) and the second insulation strip (222) with respect to two cell plates, thereby reducing the production precision requirements and production difficulty; In another aspect, a relatively wide first outer extension section (2221) and a relatively narrow second outer extension section (2222) are formed in the second insulating strip (222), wherein the relatively wide first outer extension section (2221) is advantageous for covering a larger area of ​​the edge of the fourth cell plate (214A) and the edge of the third cell plate (213A) than the first outer extension section (2221), thereby better reducing the risk of a short circuit caused by contact between the intermediate busbar (232) and the anisotropic welding ribbon or anisotropic grid line on the fourth cell plate (214A), and also reducing the risk of a short circuit caused by contact between the second welding ribbon B (242) and the anisotropic welding ribbon or anisotropic grid line of the third cell plate (213A), thereby improving the reliability of the cell assembly; The relatively narrow second external extension section (2222) ensures that the aforementioned production precision requirements and the risk of short circuits are reduced, while the second external extension section (2222) can reduce the impact on the double-sided efficiency of the cell assembly, thereby ensuring that the cell assembly has a relatively high double-sided efficiency.

[0247] In some embodiments, with reference to FIG. 10, the cell assembly further comprises a front plate, and the cell string is installed on the front plate, and the front plate has a first edge (271) and a second edge (272) arranged along a second direction, and the orthographic projection of the first insulating strip (221) in the thickness direction of the sixth cell plate (212) is located between the first edge (271) and the second edge (272).

[0248] If the first insulating strip (221) extends beyond the first edge (271) or the second edge (272), the material layers, such as the adhesive film, front plate, and back plate of the cell assembly, cannot be sufficiently bonded, and in particular, the edge region causes external moisture to easily penetrate into the cell assembly, thereby affecting the reliability of the cell assembly.

[0249] The present embodiment further discloses a photovoltaic system comprising the back contact cell assembly described above.

[0250] Example 12

[0251] The difference between the present embodiment and embodiment 11 is, with reference to FIGS. 12 to 14, that the fifth cell plate (211) and one end of the sixth cell plate (212) near the fifth cell plate (211) are at least partially stacked, that is, since the fifth cell plate (211) and the sixth cell plate (212) use an overlap installation method, there is no gap between the two cells, and here,

[0252] 1mm<D1≤l 21 +l 23 -l 22 is,

[0253] In the formula, D1 is the width of the first width extension section (2211) in the first direction, and l 21 is the relative width distance between the edge of one end of the sixth cell plate (212) near the fifth cell plate (211) from the first busbar (231) in the first direction, and l22 is the width of the stacked area between the fifth cell plate (211) and the sixth cell plate (212) in the first direction, and l 23 The relative width distance from the edge of one end of the fifth cell plate (211) near the sixth cell plate (212) to the first welding point (261) is installed at one end of the fifth cell plate (211) near the sixth cell plate (212) to be connected to the second welding ribbon A (241).

[0254] Here, in one embodiment, with reference to FIG. 12, one side of the sixth cell plate (212) oriented on the first insulating strip (221) and the fifth cell plate (211) are at least partially laminated.

[0255] In another embodiment, referring to FIG. 13, one side of the sixth cell plate (212) pointing to the first insulating strip (221) and the fifth cell plate (211) are at least partially laminated.

[0256] What can be understood is, l 21 +l 22 >1mm and l 21 By controlling it so that D1 > 1mm, the first width extension section (2211) can be secured to extend and cover the edge area of ​​the fifth cell plate (211) and the edge area of ​​the sixth cell plate (212), while leaving sufficient shift space for the horizontal tolerance of equipment placement during the manufacturing process and the tolerance for shifting of the busbar during the lamination process, thereby allowing the first insulating strip (221) to have a small width shift in the width direction with respect to the first busbar (231) and the first insulating strip (221) to have a small width shift with respect to the two cell plates.

[0257] If the width of the first width expansion section (2211) is excessively small, the risk of a short circuit increases and the reliability of the cell assembly decreases; as the width of the first width expansion section (2211) increases, the reliability of the cell assembly increases, and the displacement shift in the width direction of the first insulation strip (221) regarding the first busbar (231) and the first insulation strip (221) regarding the two cell plates allowed during the manufacturing process increases, and the production precision requirement decreases. However, if the width of the first width expansion section (2211) is excessively large, it affects sufficient welding between the second welding ribbon A (241) and the fifth cell plate (211), thereby reducing the current collection effect and affecting the double-sided efficiency rate of the cell assembly. Therefore, in this embodiment, 1mm < D1 ≤ l 21 +l 22 +l 23 By controlling it in this way, on the basis of ensuring that a certain shift exists during the manufacturing process of the first insulating strip (221), it is possible to ensure that the first width extension section (2211) of the first insulating strip (221) extends and covers the edge area of ​​the fifth cell plate (211) and the edge area of ​​the sixth cell plate (212), thereby further improving the reliability and production yield of the cell assembly and reducing the production precision requirements, while at the same time preventing the sufficient welding between the second welding ribbon A (241) and the effective welding position of the fifth cell plate (211) from being affected, and also preventing unnecessary material waste and loss of double-sided efficiency.

[0258] Those skilled in the art will clearly understand that, for ease and brevity of explanation, the structure and implementation principle of the back contact cell described above can be referenced to the corresponding structure and implementation principle in Example 13 described above, and will not be explained repeatedly here.

[0259] Example 13

[0260] As illustrated in FIGS. 11 and 15, the present embodiment discloses a back contact cell assembly comprising a parallel cell string group (2200), a second insulating strip (222), an intermediate busbar (232), and a second welding ribbon B (242), and

[0261] The same parallel cell string group (2200) comprises at least two cell strings arranged along a first direction and installed in parallel with each other, each cell string comprises cell plates arranged in series with each other, the cell plates arranged in series with each other comprise a third cell plate (213) and a fourth cell plate (214) arranged along the first direction, the fourth cell plate (214) is installed at the edge of the cell string, and the fourth cell plate (214) of the two cell strings installed in parallel with each other is installed adjacently in the first direction;

[0262] The second insulating strip (222) is installed on the edge of the third cell plate (213) in the cell string, and the second insulating strip (222) is installed at one end of the third cell plate (213) near the fourth cell plate (214);

[0263] An intermediate busbar (232) is for parallelizing two cell strings installed adjacently in a first direction, and the intermediate busbar (232) is installed on one side of a second insulating strip (222) oriented toward a third cell plate (213), and both the second insulating strip (222) and the intermediate busbar (232) are installed extending along a second direction;

[0264] The second welding ribbon B (242) is intended to electrically connect an intermediate busbar (232), a fourth cell plate (214) in a cell string where the intermediate busbar (232) is located, and a fourth cell plate (214) in another cell string adjacent to the cell string in a first direction.

[0265] Here, in the first direction, a first external extension section (2221) and a second external extension section (2222) are installed at both ends of the second insulation strip (222) and extend outside the edge of the intermediate busbar (232), and the first external extension section (2221) and the second external extension section (2222) are installed sequentially along a direction away from the fourth cell plate (214), and the width of the second external extension section (2222) is smaller than the width of the first external extension section (2221).

[0266] For example, for ease of explanation, a third cell string (220A) and a fourth cell string (220B) parallel to each other in the same parallel cell string group (2200) are given as examples, wherein the third cell string (220A) is a cell string in which an intermediate busbar (232) is located;

[0267] The third cell plate (213) in the third cell string (220A) is recorded as the third cell plate (213A), and the fourth cell plate (214) is recorded as the fourth cell plate (214A); the third cell plate (213) in the fourth cell string (220B) is recorded as the third cell plate (213B), and the fourth cell plate (214) is recorded as the fourth cell plate (214B); the third cell string (220A) and the fourth cell string (220B) are arranged along a first direction, and the fourth cell plate (214A) and the fourth cell plate (214B) are installed adjacently in the first direction;

[0268] The cell assembly further includes a second insulating strip (222), an intermediate busbar (232), and a second welding ribbon B (242), and

[0269] The second insulating strip (222) is installed on the edge of the third cell plate (213A) in the third cell string (220A), and the second insulating strip (222) is installed at one end of the third cell plate (213A) near the fourth cell plate (214A);

[0270] An intermediate busbar (232) is for parallelizing the third cell string (220A) and the fourth cell string (220B), and the intermediate busbar (232) is installed on one side of the second insulating strip (222) oriented on the third cell plate (213), and both the second insulating strip (222) and the intermediate busbar (232) are installed extending along the second direction;

[0271] The second welding ribbon B (242) is intended to electrically connect the intermediate busbar (232), the fourth cell plate (214A), and the fourth cell plate (214B), that is, the same second welding ribbon B (242) extends sequentially from the fourth cell plate (214B) to the fourth cell plate (214A) and the intermediate busbar (232).

[0272] In some embodiments, an extension section extending to the outside edge of the third cell plate (213A) is installed at one end of the second insulating strip (222) near the fourth cell plate (214A), and in the thickness direction of the third cell plate (213A), the orthographic projection of the extension section and the orthographic projection of the fourth cell plate (214A) overlap at least partially. In other embodiments, an extension section is installed at one end of the intermediate busbar (232) near the fourth cell plate (214A), and the extension section extends to the outside edge of the second insulating strip (222) in the first direction and is also electrically connected to the second welding ribbon B (242), and a joint end is formed at the connection point between the extension section and the second welding ribbon B (242).

[0273] Thus, when assembled, each cell plate in the cell string is connected in series with each other, the second insulating strip (222) is installed at one end of the third cell plate (213A) near the fourth cell plate (214A), the intermediate busbar (232) is installed on the back of the second insulating strip (222), the main body of the second welding ribbon B (242) is electrically connected to the effective welding position of the fourth cell plate (214A) and the effective welding position of the fourth cell plate (214B), respectively, and the one end of the second welding ribbon B (242) near the third cell plate (213A) is electrically connected to the intermediate busbar (232), thereby allowing the intermediate busbar (232) to connect the third cell string (220A) and the fourth cell string (220B) in parallel.

[0274] First, in an embodiment of the present invention, the intermediate busbar (232) is installed on the third cell plate (213A), and the intermediate busbar (232) and the third cell plate (213A) are separated by the second insulating strip (222). In one aspect, there is no need to leave space in advance for the busbar at the edge of the cell assembly, so more space can be left for mounting the cell plate in the cell assembly, thereby increasing the effective light-receiving area of ​​the cell assembly and increasing the assembly switching efficiency. In another aspect, when viewed from the direction of the light-receiving surface (or referred to as the “front”) of the cell plate, the second insulating strip (222) can shield the intermediate busbar (232), thereby further improving the overall aesthetics of the cell assembly.

[0275] Next, compared to installing a busbar at an intermediate position on the back of a cell plate, the intermediate busbar (232) of the embodiment of the present invention is installed at one end of the third cell plate (213A) near the fourth cell plate (214A), and the second welding ribbon B (242) is connected to the effective welding position of the fourth cell plate (214B) and then extends to the fourth cell plate (214A), and is also sufficiently bonded and welded to the effective welding position of the fourth cell plate (214A), thereby preventing the welding of the second welding ribbon B (242) and the fourth cell plate (214A) from becoming insufficient due to the installation of the intermediate busbar (232) and affecting the collection of current, and at the same time, after the second welding ribbon B (242) is welded to the fourth cell plate (214A) and the fourth cell plate (214B), there is no need to perform an opening treatment on the insulating strip or replace it with an intermittently installed insulating block, but directly to the intermediate busbar (232) By allowing them to be connected and, when assembling, simply placing the entire second insulation strip (222) on one end of the third cell plate (213A) near the fourth cell plate (214A), the production precision requirements and production difficulty are effectively reduced, and a short circuit is prevented due to position shifting when opening the insulation strip or when laminating the insulation block, thereby increasing the product yield.

[0276] At the same time, the second insulating strip (222) of the embodiment of the present invention is provided with a first external extension section (2221) and a second external extension section (2222), that is, on both sides of the second insulating strip (222) in the first direction, a width extension section exceeding the edge of the intermediate busbar (232) is left.The installation of the first external extension section (2221) and the second external extension section (2222) allows, in one aspect, for the second insulation strip (222) to have a certain degree of shift in the width direction in the manufacturing process with respect to the intermediate busbar (232) and the second insulation strip (222) to have a certain degree of shift with respect to the two cell plates, thereby reducing the production precision requirements and production difficulty; In another aspect, the second outer extension section (2222) of the second insulation strip (222) of the embodiment of the present invention is smaller than the first outer extension section (2221), that is, in the first direction, the intermediate busbar (232) is installed at an angle rather than symmetrically centered with respect to the second insulation strip (222), and such installation forms a relatively wide first outer extension section (2221) and a relatively narrow second outer extension section (2222), wherein the relatively wide first outer extension section (2221) is advantageous for covering a larger area of ​​the fourth cell plate (214A) edge and the third cell plate (213A) edge than the first outer extension section (2221), thereby better reducing the risk of the anisotropic welding ribbon or anisotropic grid line on the intermediate busbar (232) coming into contact with the fourth cell plate (214A) and causing a short circuit, and also the second welding ribbon The risk of a short circuit caused by contact between the anisotropic welding ribbon or anisotropic grid line of A (242) and the third cell plate (213A) can be reduced, thereby improving the reliability of the cell assembly; and the relatively narrow second outer extension section (2222) ensures that the above-mentioned production precision requirements and the risk of a short circuit are reduced, while the second outer extension section (2222) can reduce the impact on the double-sided efficiency of the cell assembly, thereby ensuring that the cell assembly has a relatively high double-sided efficiency.

[0277] In addition, if the busbar is installed on the outer edge of the last cell plate of the cell string, that is, at one end of the fourth cell plate (214A) far from the third cell plate (213A), the stress at the said location is relatively large when laminating the outer edge of the last cell plate of the cell string, so defects such as breakage are easily generated, and at the same time, since the mounting of the busbar can affect the welding between the second welding ribbon B (242) and the fourth cell plate (214A), the second welding ribbon B (242) cannot weld to the fourth cell plate (214A) at the location shielded by the busbar, resulting in insufficient welding between the second welding ribbon B (242) and the fourth cell plate (214A), which leads to poor current collection, and this situation is particularly severe if the cell assembly is a back contact cell assembly without a main grid.

[0278] Relatively speaking, the intermediate busbar (232) embedded structure of the embodiment of the present invention can be applied to a back contact cell assembly containing a main grid and a back contact cell assembly not containing a main grid, thus having greater versatility. Also, on one side, the stress during lamination is smaller at one end of the third cell plate (213A) near the fourth cell plate (214A) compared to the outer edge of the last cell plate of the cell string, thereby further reducing the risk of potential cracking or breakage of the cell plate and improving the reliability of the back contact cell assembly.

[0279] In some embodiments, with reference to FIG. 15, the first outer extension section (2221) extends at least partially outside the edge of the third cell plate (213).

[0280] Thus, on the basis that the second insulating strip (222) allows for a certain degree of shift in the width direction during the manufacturing process with respect to the intermediate busbar (232) and the second insulating strip (222) with respect to the two cell plates, and also ensures that the first width extension section (2211) can cover more of the area of ​​the fourth cell plate (214A) edge and the third cell plate (213A) edge, thereby reducing the risk of a short circuit caused by contact between the intermediate busbar (232), the second welding ribbon A (241), and the anisotropic welding ribbon or anisotropic grid line, and improving the reliability of the cell assembly.

[0281] In some embodiments, referring to FIG. 15, in the first direction, the orthographic projection of the first outer extension section (2221) in the thickness direction of the third cell plate (213) and the orthographic projection of the fourth cell plate (214) in the thickness direction of the third cell plate (213) overlap at least partially.

[0282] This allows the second insulating strip (222) to cover the edges of the third cell plate (213A) and the fourth cell plate (214A), thereby preventing the anisotropic welding ribbon or anisotropic grid line on the intermediate busbar (232) from coming into contact with the fourth cell plate (214A) and causing a short circuit, and also prevents the anisotropic welding ribbon or anisotropic grid line on the second welding ribbon B (242) from coming into contact with the third cell plate (213A) and causing a short circuit, thereby further reducing the risk of a short circuit.

[0283] In particular, when a cell plate is cut in half, a short circuit is easily caused after the cutting edge is cut. However, the installation of the first external extension section (2221) of the embodiment of the present invention can effectively prevent a short circuit easily caused by the cutting edge, thereby ensuring the reliability of the cell assembly by installing the cutting edge of the cell half edge on the side where the intermediate busbar (232) is located on the cell plate or on one side of an adjacent cell plate close to the intermediate busbar (232).

[0284] In some embodiments, referring to FIG. 15, in the first direction, the width d2 of the second outer extension section (2222) is ≥1mm.

[0285] If the second external extension section (2222) is excessively small, the amount of shift allowed in the second insulation strip (222) during the manufacturing process is small, which results in the need to improve production precision requirements. If the width of the second external extension section (2222) of this embodiment is controlled to ≥1mm, sufficient shift space can be left in advance for the horizontal tolerance of the equipment placement during the manufacturing process and the laminate shift tolerance of the busbar extraction hole position, thereby reducing production precision requirements.

[0286] In some embodiments, referring to FIG. 15, the fourth cell plate (214) and the third cell plate (213) are installed on the same plane, where,

[0287] 1mm<d1≤l 31 +l 32 +l 33 is,

[0288] In the formula, d1 is the width of the first outer extension section (2221) in the first direction, and l 31 is the relative width distance between the edge of one end of the third cell plate (213) near the fourth cell plate (214) from the intermediate busbar (232) in the first direction in the cell string where the intermediate busbar (232) is installed, and l 32is the gap between the fourth cell plate (214) and the third cell plate (213) in the cell string where the intermediate busbar (232) is installed, and l 33 The distance is the relative width of the second welding point (262) from the edge of one end of the fourth cell plate (214) near the third cell plate (213) in the cell string where the intermediate busbar (232) is installed, and the second welding point (262) is installed on the fourth cell plate (214) in the cell string where the intermediate busbar (232) is located, and is installed at one end of the fourth cell plate (214) near the third cell plate (213) to be connected to each other with the second welding ribbon B (242).

[0289] It can be understood that the second welding point (262) is located at the edge closest to the third cell plate (213A) at the effective welding position of the fourth cell plate (214A) (i.e., the connection point of the edge of the second welding ribbon B (242) in the fourth cell plate (214A)), and the second welding point (262) may be a grid line, a welding pad, but is not limited thereto.

[0290] What can be understood is, l 31 +l 32 >1mm and l 31 By controlling it so that <1mm, and thus d1 > 1mm, the first outer extension section (2221) can be secured to extend and cover the edge area of ​​the fourth cell plate (214A) and the edge area of ​​the third cell plate (213A), while leaving sufficient shift space for the horizontal tolerance of the equipment placement in the manufacturing process and the laminate shift tolerance of the busbar extraction hole position, thereby allowing the second insulating strip (222) to have a small width shift in the width direction with respect to the intermediate busbar (232) and the second insulating strip (222) to have a small width shift with respect to the two cell plates.

[0291] If the width of the first outer extension section (2221) is excessively small, the risk of short circuit increases and the reliability of the cell assembly decreases; as the width of the first outer extension section (2221) increases, the reliability of the cell assembly increases, and the displacement shift in the width direction of the second insulation strip (222) regarding the intermediate busbar (232) and the second insulation strip (222) regarding the two cell plates allowed during the manufacturing process increases, and the production precision requirement decreases. However, if the width of the first outer extension section (2221) is excessively large, it affects sufficient welding between the effective welding position of the second welding ribbon B (242) and the fourth cell plate (214A), thereby reducing the current collection effect and affecting the double-sided efficiency rate of the cell assembly. Therefore, in this embodiment, 1mm < d1 ≤ l 31 +l 32 + 33 By controlling it in this way, on the basis of ensuring that a certain shift exists during the manufacturing process of the second insulation strip (222), it is possible to ensure that the first outer extension section (2221) of the second insulation strip (222) further extends and covers the edge area of ​​the third cell plate (213A) and the edge area of ​​the fourth cell plate (214A), thereby further improving the reliability and production yield of the cell assembly and reducing the production precision requirements, while at the same time preventing the sufficient welding between the effective welding position of the second welding ribbon B (242) and the fourth cell plate (214A) from being affected, and also preventing unnecessary material waste and loss of double-sided efficiency.

[0292] In some embodiments, the cell assembly further includes a front plate, and the cell string is installed on the front plate, and the first edge and the second edge are arranged along the second direction on the front plate, and the orthographic projection of the second insulating strip (222) in the thickness direction of the third cell plate (213) is located between the first edge and the second edge.

[0293] If the second insulating strip (222) extends beyond the first edge or the second edge, the material layers, such as the adhesive film, front plate, and back plate of the cell assembly, cannot be sufficiently composited, and in particular, the edge region causes external moisture to easily penetrate into the cell assembly, thereby affecting the reliability of the cell assembly.

[0294] Those skilled in the art will clearly understand that, for ease and brevity of explanation, the structure and implementation principle of the back contact cell described above can be referenced to the corresponding structure and implementation principle in Example 13 described above, and will not be explained repeatedly here.

[0295] Example 14

[0296] The difference between the present embodiment and embodiment 13 is, with reference to FIGS. 16 to 18, that in a cell string with an intermediate busbar (232) installed, one end of the third cell plate (213) near the fourth cell plate (214) and the fourth cell plate (214) are at least partially stacked, that is, since the third cell plate (213A) and the fourth cell plate (214A) use an overlap installation method, there is no gap between the two cells, and here,

[0297] 1mm<d1≤l 41 +l 43 -l 42 And,

[0298] In the formula, d1 is the width of the first outer extension section (2221) in the first direction, and l 41 is the relative width distance between the edge of one end of the third cell plate (213) near the fourth cell plate (214) from the intermediate busbar (232) in the first direction in the cell string where the intermediate busbar (232) is installed, and l 42 is the width of the stacked area between the third cell plate (213) and the fourth cell plate (214) in the first direction, and l 43The distance is the relative width of the second welding point (262) from the edge of one end of the fourth cell plate (214) near the third cell plate (213) in the cell string where the intermediate busbar (232) is installed, and the second welding point (262) is installed at one end of the fourth cell plate (214) near the third cell plate (213) to be connected to each other with the second welding ribbon B (242).

[0299] Here, referring to FIG. 17, in one embodiment, one side of the third cell plate (213A) pointing to the first insulating strip (221) and the fourth cell plate (214A) are at least partially laminated.

[0300] Referring to FIG. 18, in another embodiment, one side of the third cell plate (213A) oriented on the second insulating strip (222) and the fourth cell plate (214A) are at least partially laminated.

[0301] What can be understood is, l 41 +l 42 >1mm and l 41 By controlling it so that <1mm, and thus d1 > 1mm, the first outer extension section (2221) can be secured to extend and cover the edge area of ​​the fourth cell plate (214A) and the edge area of ​​the third cell plate (213A), while leaving sufficient shift space for the horizontal tolerance of the equipment placement in the manufacturing process and the laminate shift tolerance of the busbar extraction hole position, thereby allowing the second insulating strip (222) to have a small width shift in the width direction with respect to the intermediate busbar (232) and the second insulating strip (222) to have a small width shift with respect to the two cell plates.

[0302] If the width of the first outer extension section (2221) is excessively small, the risk of short circuit increases and the reliability of the cell assembly decreases; as the width of the first outer extension section (2221) increases, the reliability of the cell assembly increases, and the displacement shift in the width direction of the second insulation strip (222) regarding the intermediate busbar (232) and the second insulation strip (222) regarding the two cell plates allowed during the manufacturing process increases, and the production precision requirement decreases. However, if the width of the first outer extension section (2221) is excessively large, it affects sufficient welding between the effective welding position of the second welding ribbon B (242) and the fourth cell plate (214A), thereby reducing the current collection effect and affecting the double-sided efficiency rate of the cell assembly. Therefore, in this embodiment, 1mm < d1 ≤ l 41 +l 42 +l 43 By controlling it in this way, on the basis of ensuring that a certain shift exists during the manufacturing process of the second insulation strip (222), it is possible to ensure that the first outer extension section (2221) of the second insulation strip (222) further extends and covers the edge area of ​​the third cell plate (213A) and the edge area of ​​the fourth cell plate (214A), thereby further improving the reliability and production yield of the cell assembly and reducing the production precision requirements, while at the same time preventing the sufficient welding between the effective welding position of the second welding ribbon B (242) and the fourth cell plate (214A) from being affected, and also preventing unnecessary material waste and loss of double-sided efficiency.

[0303] Those skilled in the art will clearly understand that, for ease and brevity of explanation, the structure and implementation principle of the back contact cell described above can be referenced to the corresponding structure and implementation principle in the aforementioned Examples 11, 12, and 13, and will not be described repeatedly here.

[0304] Example 15

[0305] As illustrated in FIGS. 7, 9 and 19, the present embodiment discloses a back contact cell assembly, which comprises a cell string, a first insulating strip (321), a first busbar (331) and a second welding ribbon A (341), and

[0306] The cell string includes cell plates arranged in series with each other, and the cell plates include a fifth cell plate (311) and a sixth cell plate (312) arranged along a first direction, and the fifth cell plate (311) is installed at the edge of the cell string;

[0307] The first insulating strip (321) is installed at one end of the sixth cell plate (312) near the fifth cell plate (311);

[0308] The first busbar (331) is installed on one side of the first insulating strip (321) oriented toward the sixth cell plate (312), that is, the back side of the first insulating strip (321); otherwise, the side of the first insulating strip (321) pointing toward the sixth cell plate (312) is the front side of the first insulating strip (321); both the first insulating strip (321) and the first busbar (331) are installed extending along the second direction, and the first direction and the second direction are set to intersect;

[0309] The second welding ribbon A (341) is for electrically connecting the first busbar (331) and the fifth cell plate (311);

[0310] An external extension section (3211) protruding outside the first busbar (331) is installed at one end of the first insulating strip (321) near the fifth cell plate (311), and the external extension section (3211) extends outside the sixth cell plate (312). In the thickness direction of the sixth cell plate (312), the orthographic projection of the external extension section (3211) and the orthographic projection of the fifth cell plate (311) overlap at least partially, that is, the external extension section (3211) can cover the edge region of the fifth cell plate (311), thereby isolating the first busbar (331) and the edge region of the fifth cell plate (311).

[0311] It can be understood that electrical connection methods may include welding, bonding via conductive adhesive, etc., but are not limited to these.

[0312] It can be understood that, in a cell string, the cell string may include two cell plates in series, three cell plates in series, or a larger number of other cell plates, and specifically, the number of cell plates to be serialized can be determined according to the actual usage situation.

[0313] In this embodiment, the first busbar (331) is an edge busbar, and the fifth cell plate (311) is located at the edge of the cell string. For ease of explanation, in this embodiment, the end where the fifth cell plate (311) is located is recorded as the tail end of the cell string, that is, in the first direction, the fifth cell plate (311) is the last cell plate of the cell string, and the sixth cell plate (312) is the second-to-last cell plate of the cell string. It is not difficult to understand that the end where the fifth cell plate (311) is located may also be recorded as the head end of the cell string, and this is not repeated here.

[0314] Optionally, within the same cell string, adjacent cell plates can be connected in series using methods such as welding ribbons or conductive adhesives.

[0315] In one embodiment, adjacent cell plates are connected through a series welding ribbon (351), specifically, the series welding ribbon (351) comprises a first series welding ribbon (3511) and a second series welding ribbon (3512), and in a first direction, the first series welding ribbon (3511) and the second series welding ribbon (3512) are installed to intersect, and in a second direction, the first series welding ribbon (3511) and the second series welding ribbon (3512) are installed to intersect, and in a cell string, the Nth cell plate, the N+1th cell plate, and the N+2th cell plate (N is a positive integer greater than or equal to 1) are arranged sequentially along the first direction, wherein the positive welding point of the Nth cell plate and the negative welding point of the N+1th cell plate are connected in series through a plurality of first series welding ribbons (3511), and the positive welding point of the N+1th cell plate and the negative welding point of the N+2th cell plate The two are connected in series through multiple second series welding ribbons (3512).

[0316] When assembled, each cell plate in the cell string is connected in series with each other, and the first insulating strip (321) is installed at one end of the sixth cell plate (312) near the fifth cell plate (311), and the first bus bar (331) is installed on the back of the first insulating strip (321), and the main body of the second welding ribbon A (341) and the effective welding position of the fifth cell plate (311) are electrically connected, and the one end of the second welding ribbon A (341) near the sixth cell plate (312) and the first bus bar (331) are electrically connected so that the first bus bar (331) can draw current from the cell string.

[0317] First, in an embodiment of the present invention, the first busbar (331) is installed on the sixth cell plate (312), and the first busbar (331) and the sixth cell plate (312) are separated by the first insulating strip (321). In one aspect, there is no need to leave space in advance for the busbar at the edge of the cell assembly, so more space can be left for mounting the cell plate in the cell assembly, thereby increasing the effective light-receiving area of ​​the cell assembly and increasing the assembly switching efficiency. In another aspect, when viewed from the direction of the light-receiving surface (or referred to as the “front”) of the cell plate, the first insulating strip (321) can shield the first busbar (331), preventing the first busbar (331) from being exposed and further improving the overall aesthetics of the cell assembly.

[0318] Next, compared to installing the busbar at an intermediate position on the back of the cell plate, the first busbar (331) of the embodiment of the present invention is installed at one end of the sixth cell plate (312) near the fifth cell plate (311), so that the second welding ribbon A (341) can be sufficiently bonded and welded to the effective welding position of the fifth cell plate (311), and prevent the welding of the second welding ribbon A (341) and the fifth cell plate (311) from becoming insufficient due to the mounting of the first busbar (331) and thus affecting the collection of current, and at the same time, after the second welding ribbon A (341) is welded to the fifth cell plate (311), it can be directly connected to the first busbar (331) without the need to perform an opening treatment on the insulating strip or replace it with an intermittently installed insulating block, and during assembly, only the entire first insulating strip (321) is placed at one end of the sixth cell plate (312) near the fifth cell plate (311). Since this is possible, production precision requirements and production difficulty are effectively reduced, and short circuits caused by position shifts during the opening of insulation strips or during the lamination of insulation blocks are prevented, thereby increasing product yield.At the same time, since the first insulating strip (321) of the present application is installed in the outer extension section (3211), on one side, a certain degree of shift in the width direction exists between the first insulating strip (321) and the first insulating strip (321) with respect to the first busbar (331) and between the two cell plates during the manufacturing process, thereby reducing the production precision requirements and production difficulty; on the other side, the first insulating strip (321) can cover the edges of the sixth cell plate (312) and the fifth cell plate (311), thereby preventing the anisotropic welding ribbon or anisotropic grid line on the first busbar (331) and the fifth cell plate (311) from coming into contact and causing a short circuit, and also prevent short circuits caused by the anisotropic welding ribbon or anisotropic grid line on the second welding ribbon A (341) and the sixth cell plate (312) coming into contact, as well as short circuits easily caused by conductive foreign substances such as tin slug during the manufacturing process, thus preventing short circuits In addition to further reducing risk and improving the reliability of the cell assembly, especially when the cell plate is cut in half, the cutting edge is extremely prone to causing a short circuit after cutting, but the installation of the external extension section (3211) of the embodiment of the present invention can effectively prevent the short circuit easily caused by the cutting edge, thereby ensuring the reliability of the cell assembly by installing the cutting edge of the cell half edge on the side where the first bus bar (331) on the cell plate is located or on one side of an adjacent cell plate close to the first bus bar (331).

[0319] Additionally, if the busbar is installed on the outer edge of the last cell plate of the cell string, that is, at one end of the fifth cell plate (311) far from the sixth cell plate (312), the outer edge of the last cell plate of the cell string is close to the edge of the cell assembly, so the stress at the above location during lamination is relatively large, so defects such as breakage are easily generated, and at the same time, since the mounting of the busbar can affect the welding between the second welding ribbon A (341) and the fifth cell plate (311), the second welding ribbon A (341) cannot weld to the fifth cell plate (311) at the location shielded by the busbar, resulting in insufficient welding between the second welding ribbon A (341) and the fifth cell plate (311), poor current collection, and this situation is particularly serious if the cell assembly is a back contact cell assembly without a main grid.

[0320] Relatively speaking, the edge portion busbar embedded structure of the embodiment of the present invention can be applied to a back contact cell assembly containing a main grid and a back contact cell assembly not containing a main grid, thus having greater versatility. Additionally, since the stress during lamination is smaller at one end of the sixth cell plate (312) close to the fifth cell plate (311) compared to the outer edge of the last cell plate of the cell string, the risk of breakage or cracking can be reduced, thereby further improving the reliability of the cell assembly.

[0321] In one embodiment, with reference to FIGS. 7, 9 and 19, the fifth cell plate (311) and the sixth cell plate (312) are installed on the same plane, and in the first direction, the width of the portion protruding outside the sixth cell plate (312) of the outer extension section (3211) is greater than the gap between the fifth cell plate (311) and the sixth cell plate (312).

[0322] Thus, the external extension section (3211) is made to have sufficient width in advance, allowing the first insulation strip (321) to have a certain degree of shift in the width direction during the manufacturing process with respect to the first bus bar (331) and the first insulation strip (321) to have a certain degree of shift with respect to the two cell plates, thereby reducing the production precision requirements and production difficulty. On the other hand, the external extension section (3211) is made to extend and cover the edge area of ​​the fifth cell plate (311) and the edge area of ​​the sixth cell plate (312), thereby preventing the anisotropic welding ribbon or anisotropic grid line on the first bus bar (331) and the fifth cell plate (311) from coming into contact and causing a short circuit, and also preventing the anisotropic welding ribbon or anisotropic grid line on the second welding ribbon A (341) and the sixth cell plate (312) from coming into contact and causing a short circuit, thereby further reducing the risk of a short circuit and improving the reliability of the cell assembly.

[0323] In one embodiment, referring to FIG. 19, in the first direction, the width of the outer extension section (3211) is,

[0324] 1mm≤L1≤l 11 +l 12 +l 13 And,

[0325] In the formula, L1 is the width of the outer extension section (3211) in the first direction, and l 11 is the gap between the 5th cell plate (311) and the 6th cell plate (312), and l 12 is a relative width distance from the edge of one end of the fifth cell plate (311) near the sixth cell plate (312) to the first welding point (361), the first welding point (361) is for connecting with the second welding ribbon A (341), is installed at one end of the fifth cell plate (311) near the sixth cell plate (312), and l 13is the relative width distance between the edge of one end of the first bus bar (331) near the fifth cell plate (311) and the edge of one end of the sixth cell plate (312) near the fifth cell plate (311).

[0326] What can be understood is, l 11 +l 13 >1mm and l 11 <1mm, and therefore, if L1 > 1mm, the first outer extension section (3211) can be secured to extend and cover the edge area of ​​the fifth cell plate (311) and the edge area of ​​the sixth cell plate (312), while leaving sufficient shift space for the horizontal tolerance of equipment placement during the manufacturing process and the tolerance for shifting of the busbar during the lamination process, thereby allowing the first insulating strip (321) to have a small width shift in the width direction with respect to the first busbar (331) and the first insulating strip (321) to have a small width shift with respect to the two cell plates.

[0327] If the width of the outer extension section (3211) is excessively small, the risk of short circuit increases and the reliability of the cell assembly decreases; as the width of the outer extension section (3211) increases, the reliability of the cell assembly increases, and the displacement shift in the width direction of the first insulation strip (321) allowed in the manufacturing process with respect to the first busbar (331) and the first insulation strip (321) with respect to the two cell plates increases, and the production precision requirement decreases. However, if the width of the outer extension section (3211) is excessively large, it affects sufficient welding between the second welding ribbon A (341) and the effective welding position of the fifth cell plate (311), thereby reducing the current collection effect and affecting the double-sided efficiency rate of the cell assembly. It is understandable that the first welding point (361) is at the edge of the effective welding position of the fifth cell plate (311) closest to the sixth cell plate (312) (i.e., the second welding ribbon at the fifth cell plate (311)). It is located at the connection point of the outermost edge of A (341), and the first welding point (361) may be a grid line or a welding pad, and in an embodiment of the present invention, 1mm≤L1≤l 11 +l 12 +l 13 By controlling it in this way, the outer extension section (3211) of the first insulation strip (321) is secured to extend and cover the edge area of ​​the fifth cell plate (311) and the edge area of ​​the sixth cell plate (312), thereby further improving the reliability and production yield of the cell assembly, while at the same time preventing unnecessary material waste and preventing it from affecting the sufficient welding of the second welding ribbon A (341).

[0328] In one embodiment, referring to FIG. 19, in the first direction, the width of the outer extension section (3211) is,

[0329] 1mm≤L1≤l 11 +l 13 It is +4mm, and

[0330] In the formula, L1 is the width of the outer extension section (3211) in the first direction, and l 11 is the gap between the 5th cell plate (311) and the 6th cell plate (312), and l 13 is the relative width distance between the edge of one end of the first bus bar (331) near the fifth cell plate (311) and the edge of one end of the sixth cell plate (312) near the fifth cell plate (311).

[0331] Within this range, on the basis of allowing a shift error to exist during the manufacturing process, the outer extension section (3211) of the first insulating strip (321) is still secured to extend and cover the edge area of ​​the fifth cell plate (311) and the edge area of ​​the sixth cell plate (312), thereby further improving the reliability and production yield of the cell assembly, while at the same time, it is possible to ensure that unnecessary material waste is not caused and that even if the first insulating strip (321) shifts during manufacturing, it is not affected by the sufficient welding of the second welding ribbon A (341), thereby effectively reducing production precision.

[0332] In one embodiment, with reference to FIGS. 7 and FIGS. 10, the cell assembly comprises at least one serial cell string group (3100), and the same serial cell string group (3100) comprises two cell strings arranged along a second direction and installed serially with each other, and in the same serial cell string group (3100), extends from a sixth cell plate (312) of one cell string to a sixth cell plate (312) of another cell string through the same first bus bar (331).

[0333] Optionally, the second welding ribbon A (341) includes a first anode welding ribbon (3411) and a first cathode welding ribbon (3412), and the same first busbar (331) is electrically connected to the first anode welding ribbon (3411) of one cell string and electrically connected to the first cathode welding ribbon (3412) of another cell string to form a series between adjacent cell strings.

[0334] For example, the same series cell string group (3100) includes a first cell string (310A) and a second cell string (310B), and the second welding ribbon A (341) includes a first anode welding ribbon (3411) and a first cathode welding ribbon (3412), and in the same series cell string group (3100), the same first busbar (331) extends from a sixth cell plate (312) in the first cell string (310A) to a sixth cell plate (312) in the second cell string (310B), and in the first cell string (310A), the first busbar (331) is electrically connected to the first anode welding ribbon (3411) on the fifth cell plate (311), and in the second cell string (310B), the first busbar (331) is connected to the fifth cell plate (311) It is electrically connected to the first cathode welding ribbon (3412) above.

[0335] Here, in one embodiment, the cell assembly includes a parallel cell string group (3200), and the same parallel cell string group (3200) includes at least two cell strings arranged along a first direction and installed in parallel with each other, and a spacing area is installed between the two cell strings installed in parallel with each other, and an intermediate busbar (332) is installed in the spacing area, and the intermediate busbar (332) is for parallelizing two cell strings installed adjacently in the first direction, that is, the edge busbar embedded structure of the embodiment of the present invention can be fitted to a general intermediate busbar (332) mounting structure.

[0336] In another embodiment, with reference to FIGS. 10 and 11, a fourth cell plate (314) is installed at one end of each cell string far from the fifth cell plate (311), and a third cell plate (313) is installed at one end of the fourth cell plate (314) close to the fifth cell plate (311); the cell assembly comprises a parallel cell string group (3200), the same parallel cell string group (3200) comprises at least two cell strings arranged along a first direction and installed in parallel with each other, and the fourth cell plate (314) of the two cell strings installed in parallel with each other is installed adjacently in the first direction;

[0337] The cell assembly further includes a second insulating strip (322), an intermediate busbar (332), and a second welding ribbon B (342), and

[0338] The second insulating strip (322) is installed on the edge of the third cell plate (313) in the cell string, and the second insulating strip (322) is installed at one end of the third cell plate (313) near the fourth cell plate (314);

[0339] The intermediate busbar (332) is for parallelizing two cell strings installed adjacently in the first direction, and the intermediate busbar (332) is installed on one side of the second insulating strip (322) oriented on the third cell plate (313);

[0340] The second insulation strip (322) and the intermediate busbar (332) are both installed extending along the second direction;

[0341] The second welding ribbon B (342) is intended to electrically connect the intermediate busbar (332), the fourth cell plate (314) in the cell string, and the fourth cell plate (314) in another cell string adjacent to the cell string in the first direction.

[0342] For example, referring to the illustration in FIG. 10 and FIG. 11, for ease of explanation, a third cell string (320A) and a fourth cell string (320B) parallel to each other in the same parallel cell string group (3200) are given as examples, wherein the third cell string (320A) is a cell string in which an intermediate busbar (332) is located;

[0343] The third cell plate (313) in the third cell string (320A) is recorded as the third cell plate (313A), and the fourth cell plate (314) is recorded as the fourth cell plate (314A); the third cell plate (313) in the fourth cell string (320B) is recorded as the third cell plate (313B), and the fourth cell plate (314) is recorded as the fourth cell plate (314B); the third cell string (320A) and the fourth cell string (320B) are arranged along a first direction, and the fourth cell plate (314A) and the fourth cell plate (314B) are installed adjacently in the first direction;

[0344] The cell assembly further includes a second insulating strip (322), an intermediate busbar (332), and a second welding ribbon B (342), and

[0345] The second insulating strip (322) is installed on the edge of the third cell plate (313A) in the third cell string (320A), and the second insulating strip (322) is installed at one end of the third cell plate (313A) near the fourth cell plate (314A);

[0346] The intermediate busbar (332) is for parallelizing the third cell string (320A) and the fourth cell string (320B), and the intermediate busbar (332) is installed on one side of the second insulating strip (322) oriented on the third cell plate (313);

[0347] The second insulation strip (322) and the intermediate busbar (332) are both installed extending along the second direction;

[0348] The second welding ribbon B (342) is intended to electrically connect the intermediate busbar (332), the fourth cell plate (314A), and the fourth cell plate (314B), that is, the same second welding ribbon B (342) extends sequentially from the fourth cell plate (314B) to the fourth cell plate (314A) and the intermediate busbar (332).

[0349] Optionally, the second welding ribbon B (342) includes a second anode welding ribbon (3421) and a second cathode welding ribbon (3422), and the fourth cell plate (314A), the fourth cell plate (314B), and the intermediate busbar (332) are electrically connected through the second anode welding ribbon (3421) or the second cathode welding ribbon (3422).

[0350] The structure of the intermediate busbar (332) in the embodiment of the present invention can, in one aspect, increase the effective light-receiving area of ​​the cell assembly and improve the assembly switching efficiency, prevent the intermediate busbar (332) from being exposed to the outside, and further improve the overall aesthetics of the cell assembly; In another aspect, it is possible to ensure that the second welding ribbon B (342) is sufficiently bonded and welded to the effective welding position of the fourth cell plate (314), and to prevent the welding of the second welding ribbon B (342) and the fourth cell plate (314) from becoming insufficient due to the mounting of the intermediate busbar (332), thereby preventing the current collection from being affected. During assembly, only one entire second insulating strip (322) needs to be placed at one end of the third cell plate (313) close to the fourth cell plate (314). At the same time, through the installation of the extension section (3221), it is possible to allow a certain degree of shift in the width direction during the manufacturing process of the second insulating strip (322) relative to the intermediate busbar and the second insulating strip relative to the two cell plates, effectively reducing production precision requirements and production difficulty, and effectively reducing the risk of short circuits. Furthermore, the intermediate busbar (332) embedded structure of the embodiment of the present invention is applicable to the main grid-containing back contact cell assembly and the main grid-non-containing back contact cell assembly. This allows for greater versatility, reduces stress during lamination of the intermediate busbar (332) internal structure, lowers the risk of potential cracking or breakage of the cell plate, and improves the reliability of the back contact cell assembly.

[0351] The edge busbar embedded structure of the embodiment of the present invention is fitted to the intermediate busbar (332) embedded structure of the embodiment of the present invention, thereby increasing the effective light-receiving area of ​​the cell assembly, improving assembly switching efficiency, improving the overall aesthetics and reliability of the cell assembly, effectively reducing production precision requirements and production difficulty, and improving production efficiency.

[0352] In one embodiment, with reference to FIGS. 10 and FIGS. 11, an extension section (3221) protruding outside of the intermediate busbar (332) is installed at one end of the second insulating strip (322) near the fourth cell plate (314), and the extension section (3221) extends outside the third cell plate (313), and in the thickness direction of the third cell plate (313), the orthographic projection of the extension section (3221) and the orthographic projection of the fourth cell plate (314) in the cell string where the extension section is located overlap at least partially.

[0353] That is, at one end of the second insulating strip (322) near the fourth cell plate (314A), an extension section (3221) protruding outside the intermediate busbar (322) is installed, and the extension section (3221) extends outside the third cell plate (313A), and in the thickness direction of the third cell plate (313A), the orthographic projection of the extension section (3221) and the orthographic projection of the fourth cell plate (314A) overlap at least partially.

[0354] Since the second insulating strip (322) of the embodiment of the present invention is installed in the extended section (3221), on one side, a certain degree of shift in the width direction is allowed during the manufacturing process between the second insulating strip (322) and the intermediate busbar (332) and between the second insulating strip (322) and the two cell plates, thereby reducing the production precision requirements and production difficulty; on the other side, the second insulating strip (322) can cover the edges of the third cell plate (313) and the fourth cell plate (314), thereby preventing the anisotropic welding ribbon or anisotropic grid line on the intermediate busbar (332) and the fourth cell plate (314) from coming into contact and causing a short circuit, and also preventing the anisotropic welding ribbon or anisotropic grid line on the second welding ribbon B (342) and the third cell plate (313) from coming into contact and causing a short circuit, thereby further reducing the risk of a short circuit and improving the reliability of the cell assembly, and in particular, the cell plate in half When cutting, the cutting edge is very easily short-circuited after cutting, but the installation of the extended section (3221) of the embodiment of the present invention can effectively prevent short-circuiting easily caused by the cutting edge, thereby ensuring the reliability of the cell assembly by positioning the cutting edge of the cell half edge on the side where the intermediate busbar (332) on the cell plate is located or on one side of an adjacent cell plate close to the intermediate busbar (332).

[0355] In addition, an embodiment of the present invention provides a photovoltaic system comprising the back contact cell assembly described above.

[0356] In this embodiment, the photovoltaic system can be applied to solar power plants, such as ground-mounted power plants, rooftop power plants, and floating power plants. It can also be applied to facilities or devices that generate power using solar energy, such as user solar energy power sources, solar energy streetlights, solar energy vehicles, and solar energy buildings. Of course, it is understandable that the application scenarios of the photovoltaic system are not limited to these; in other words, the photovoltaic system can be applied to any field that requires power generation using solar energy. Taking a photovoltaic power generation system network as an example, the photovoltaic system may include a photovoltaic array, a junction box, and an inverter. The photovoltaic array may be an array combination of multiple cell assemblies; for example, multiple cell assemblies may constitute multiple photovoltaic arrays. The photovoltaic array is connected to a junction box, which can collect the current generated by the photovoltaic array. The collected current passes through an inverter to convert it into parallel electricity required by the commercial power grid, and then accesses the commercial power grid to implement solar energy power supply.

[0357] Example 16

[0358] The difference between the present embodiment and embodiment 15 is that, with reference to FIGS. 14, 20 and 21, one end of the sixth cell plate (312) near the fifth cell plate (311) and the fifth cell plate (311) are at least partially stacked, and

[0359] In the first direction, the width of the outer extension section (3211) is greater than the width of the stacking area between the fifth cell plate (311) and the sixth cell plate (312).

[0360] That is, since the fifth cell plate (311) and the sixth cell plate (312) use an overlapping installation method, there is no gap between the two cells.

[0361] In one embodiment, with reference to FIG. 21, one side of the sixth cell plate (312) oriented on the first insulating strip (321) and the fifth cell plate (311) are at least partially laminated.

[0362] In another embodiment, referring to FIG. 20, one side of the sixth cell plate (312) pointing to the first insulating strip (321) and the fifth cell plate (311) are at least partially laminated.

[0363] In one embodiment, optionally, the width of the outer extension section (3211) is,

[0364] 1mm≤L2≤l 22 +l 23 -l 21 And,

[0365] In the formula, L2 is the width of the outer extension section (3211) in the first direction, and l 21 is the width of the stacked area between the 5th cell plate (311) and the 6th cell plate (312), and l 22 is a relative width distance from the edge of one end of the fifth cell plate (311) near the sixth cell plate (312) to the first welding point (361), the first welding point (361) is for connecting with the second welding ribbon A (341), is installed at one end of the fifth cell plate (311) near the sixth cell plate (312), and l 23 is the relative width distance between the edge of one end of the first bus bar (331) near the fifth cell plate (311) and the edge of one end of the sixth cell plate (312) near the fifth cell plate (311).

[0366] What can be understood is, l 21 +l 23 >1mm and l 21<1mm, and therefore, if L2 > 1mm, the first outer extension section (3211) can be secured to extend and cover the edge area of ​​the fifth cell plate (311) and the edge area of ​​the sixth cell plate (312), while leaving sufficient shift space for the horizontal tolerance of equipment placement during the manufacturing process and the tolerance for shifting of the busbar during the lamination process, thereby allowing the first insulating strip (321) to have a small width shift in the width direction relative to the first busbar (331) during the manufacturing process.

[0367] If the width of the outer extension section (3211) is excessively small, the risk of short circuit increases and the reliability of the cell assembly decreases; as the width of the outer extension section (3211) increases, the reliability of the cell assembly increases, and the displacement shift in the width direction of the first insulation strip (321) allowed in the manufacturing process with respect to the first busbar (331) and the first insulation strip (321) with respect to the two cell plates increases, and the production precision requirement decreases. However, if the width of the outer extension section (3211) is excessively large, it affects sufficient welding between the effective welding position of the second welding ribbon A (341) and the fifth cell plate (311), thereby reducing the current collection effect and affecting the double-sided efficiency rate of the cell assembly, and in the embodiment of the present invention, 1mm≤L2≤l 22 +l 23 -l 21 By controlling it in this way, the outer extension section (3211) of the first insulation strip (321) is secured to extend and cover the edge area of ​​the fifth cell plate (311) and the edge area of ​​the sixth cell plate (312), thereby further improving the reliability and production yield of the cell assembly, while at the same time preventing unnecessary material waste and preventing it from affecting the sufficient welding of the second welding ribbon A (341).

[0368] In one embodiment, optionally, the width of the outer extension section (3211) is,

[0369] 1mm≤L2≤l 23 +4mm-l 21 And,

[0370] In the formula, L2 is the width of the outer extension section (3211) in the first direction, and l 21 is the width of the stacked area between the 5th cell plate (311) and the 6th cell plate (312), and l 23 is the relative width distance between the edge of one end of the first bus bar (331) near the fifth cell plate (311) and the edge of one end of the sixth cell plate (312) near the fifth cell plate (311).

[0371] Within this range, on the basis of allowing a shift error to exist during the manufacturing process, the outer extension section (3211) of the first insulating strip (321) is still secured to extend and cover the edge area of ​​the fifth cell plate (311) and the edge area of ​​the sixth cell plate (312), thereby further improving the reliability and production yield of the cell assembly, while at the same time, it is possible to ensure that unnecessary material waste is not caused and that even if the first insulating strip (321) shifts during manufacturing, it is not affected by the sufficient welding of the second welding ribbon A (341), thereby effectively reducing production precision.

[0372] Those skilled in the art will clearly understand that, for ease and brevity of explanation, the structure and implementation principle of the back contact cell described above can be referenced to the corresponding structure and implementation principle in Example 17 described above, and will not be explained again here.

[0373] Example 17

[0374] As illustrated in FIGS. 11 and 22, the present embodiment discloses a back contact cell assembly comprising a parallel cell string group (3200), a second insulating strip (322), an intermediate busbar (332), and a second welding ribbon B (342), and

[0375] The same parallel cell string group (3200) comprises at least two cell strings arranged along a first direction and installed in parallel with each other, each cell string comprises cell plates arranged in series with each other, the cell plates comprise a third cell plate (313) and a fourth cell plate (314) arranged along the first direction, the fourth cell plate (314) is installed at the edge of the cell string, and the fourth cell plate (314) of the two cell strings installed in parallel with each other is installed adjacently in the first direction;

[0376] The second insulating strip (322) is installed on the edge of the third cell plate (313) in the cell string, and the second insulating strip (322) is installed at one end of the third cell plate (313) near the fourth cell plate (314);

[0377] The intermediate busbar (332) is for parallelizing two cell strings installed adjacently in the first direction, and the intermediate busbar (332) is installed on one side of the second insulating strip (322) oriented on the third cell plate (313);

[0378] The second insulation strip (322) and the intermediate busbar (332) are both installed extending along the second direction;

[0379] The second welding ribbon B (342) is for electrically connecting an intermediate busbar (332), a fourth cell plate (314) in a cell string where the intermediate busbar (332) is located, and a fourth cell plate (314) in another cell string adjacent to the cell string in a first direction;

[0380] An extension section (3221) protruding outside the intermediate busbar (332) is installed at one end of the second insulating strip (322) near the fourth cell plate (314), and the extension section (3221) extends outside the third cell plate (313), and in the thickness direction of the third cell plate (313), the orthographic projection of the extension section (3221) and the orthographic projection of the fourth cell plate (314) in the cell string where the extension section is located overlap at least partially.

[0381] For example, for ease of explanation, a third cell string (320A) and a fourth cell string (320B) parallel to each other in the same parallel cell string group (3200) are given as examples, wherein the third cell string (320A) is a cell string where the intermediate busbar (332) is located;

[0382] The third cell plate (313) in the third cell string (320A) is recorded as the third cell plate (313A), and the fourth cell plate (314) is recorded as the fourth cell plate (314A); the third cell plate (313) in the fourth cell string (320B) is recorded as the third cell plate (313B), and the fourth cell plate (314) is recorded as the fourth cell plate (314B); the third cell string (320A) and the fourth cell string (320B) are arranged along a first direction, and the fourth cell plate (314A) and the fourth cell plate (314B) are installed adjacently in the first direction;

[0383] The cell assembly further includes a second insulating strip (322), an intermediate busbar (332), and a second welding ribbon B (342), and

[0384] The second insulating strip (322) is installed on the edge of the third cell plate (313A) in the third cell string (320A), and the second insulating strip (322) is installed at one end of the third cell plate (313A) near the fourth cell plate (314A);

[0385] The intermediate busbar (332) is for paralleling the third cell string (320A) and the fourth cell string (320B), and the intermediate busbar (332) is installed on one side of the second insulating strip (322) oriented on the third cell plate (313), and both the second insulating strip (322) and the intermediate busbar (332) are installed extending along the second direction;

[0386] The second welding ribbon B (342) is intended to electrically connect the intermediate busbar (332), the fourth cell plate (314A), and the fourth cell plate (314B), that is, the same second welding ribbon B (342) extends sequentially from the fourth cell plate (314B) to the fourth cell plate (314A) and the intermediate busbar (332);

[0387] At one end of the second insulating strip (322) near the fourth cell plate (314A), an extension section (3221) protruding outside the intermediate busbar (322) is installed, and the extension section (3221) extends outside the third cell plate (313A), and in the thickness direction of the third cell plate (313A), the orthographic projection of the extension section (3221) and the orthographic projection of the fourth cell plate (314A) overlap at least partially.

[0388] When assembled, each cell plate in the cell string is connected in series with each other, the second insulating strip (322) is installed at one end of the third cell plate (313A) near the fourth cell plate (314A), the intermediate bus bar (332) is installed on the back of the second insulating strip (322), the main body of the second welding ribbon B (342) is electrically connected to the effective welding position of the fourth cell plate (314A) and the effective welding position of the fourth cell plate (314B), respectively, and the one end of the second welding ribbon B (342) near the third cell plate (313A) is electrically connected to the intermediate bus bar (332), so that the intermediate bus bar (332) can connect the third cell string (320A) and the fourth cell string (320B) in parallel.

[0389] First, in an embodiment of the present invention, the intermediate busbar (332) is installed on the third cell plate (313A), and the intermediate busbar (332) and the third cell plate (313A) are separated by a second insulating strip (322). In one aspect, there is no need to leave space in advance for the busbar at the edge of the cell assembly, so more space can be left for mounting the cell plate in the cell assembly, thereby increasing the effective light-receiving area of ​​the cell assembly and increasing the assembly switching efficiency. In another aspect, when viewed from the direction of the light-receiving surface (or referred to as the “front”) of the cell plate, the second insulating strip (322) can shield the intermediate busbar (332), preventing the intermediate busbar (332) from being exposed, thereby further improving the overall aesthetics of the cell assembly.

[0390] Next, compared to installing a busbar at an intermediate position on the back of a cell plate, the intermediate busbar (332) of the embodiment of the present invention is installed at one end of the third cell plate (313A) near the fourth cell plate (314A), and the second welding ribbon B (342) is connected to the effective welding position of the fourth cell plate (314B) and extends to the fourth cell plate (314A), and is also sufficiently bonded and welded to the effective welding position of the fourth cell plate (314A), thereby preventing the welding of the second welding ribbon B (342) and the fourth cell plate (314A) from becoming insufficient due to the installation of the intermediate busbar (332) and affecting the collection of current, and at the same time, after the second welding ribbon B (342) is welded to the fourth cell plate (314A) and the fourth cell plate (314B), there is no need to perform an opening treatment on the insulation strip or replace it with an intermittently installed insulation block, but directly to the intermediate busbar (332) By allowing them to be connected and, when assembling, simply placing the entire second insulation strip (322) on one end of the third cell plate (313A) near the fourth cell plate (314A), the production precision requirements and production difficulty are effectively reduced, and a short circuit is prevented due to position shifting when opening the insulation strip or when laminating the insulation block, thereby increasing the product yield.At the same time, since the second insulating strip (322) of the embodiment of the present invention is installed in the extended section (3221), on one side, a certain degree of shift in the width direction exists between the second insulating strip (322) and the intermediate busbar (332) and between the second insulating strip (322) and the two cell plates during the manufacturing process, thereby reducing the production precision requirements and production difficulty; on the other side, the second insulating strip (322) can cover the edges of the third cell plate (313) and the fourth cell plate (314), thereby preventing the anisotropic welding ribbon or anisotropic grid line on the intermediate busbar (332) and the fourth cell plate (314) from coming into contact and causing a short circuit, and also preventing the anisotropic welding ribbon or anisotropic grid line on the second welding ribbon B (342) and the third cell plate (313) from coming into contact and causing a short circuit, thereby further reducing the risk of a short circuit and improving the reliability of the cell assembly, and in particular, the cell When a plate is cut in half, a short circuit is easily caused by the cutting edge after cutting. However, the installation of the extended section (3221) of the embodiment of the present invention can effectively prevent the short circuit easily caused by the cutting edge, thereby ensuring the reliability of the cell assembly by positioning the cutting edge of the cell half edge on the side where the intermediate busbar (332) is located on the cell plate or on one side of an adjacent cell plate close to the intermediate busbar (332).

[0391] Additionally, if the busbar is installed on the outer edge of the last cell plate of the cell string, that is, at one end of the fourth cell plate (314A) far from the third cell plate (313A), the stress at the said location is relatively large when laminating the outer edge of the last cell plate of the cell string, so defects such as breakage are easily generated, and at the same time, since the mounting of the busbar can affect the welding between the second welding ribbon B (342) and the fourth cell plate (314A), the second welding ribbon B (342) cannot weld to the fourth cell plate (314A) at the location shielded by the busbar, resulting in insufficient welding between the second welding ribbon B (342) and the fourth cell plate (314A), which leads to poor current collection, and this situation is particularly severe if the cell assembly is a back contact cell assembly without a main grid.

[0392] Relatively speaking, the intermediate busbar embedded structure of the embodiment of the present invention can be applied to a back contact cell assembly containing a main grid and a back contact cell assembly not containing a main grid, thus having greater versatility. Also, in one aspect, the stress during lamination is smaller at one end of the third cell plate (313A) near the fourth cell plate (314A) compared to the outer edge of the last cell plate of the cell string, thereby further reducing the risk of potential cracking or breakage of the cell plate and improving the reliability of the back contact cell assembly.

[0393] In one embodiment, with reference to FIG. 22, in a cell string in which a second insulating strip (322) is installed, a fourth cell plate (314) and a third cell plate (313) are installed on the same plane, and in a first direction, the width of the portion protruding to the third cell plate (313) of the extension section (3221) is greater than the gap between the fourth cell plate (314) and the third cell plate (313).

[0394] This allows sufficient width to be left in advance in the extended section (3221), thereby allowing a certain degree of shift in the width direction to exist between the second insulating strip (322) and the intermediate busbar (332) and between the second insulating strip (322) and the two cell plates during the manufacturing process, thereby reducing the production precision requirements and production difficulty. On the other hand, the extended section (3221) can extend to cover the edge area of ​​the fourth cell plate (314A) and the edge area of ​​the third cell plate (313A), thereby preventing the anisotropic welding ribbon or anisotropic grid line on the intermediate busbar (332) and the fourth cell plate (314A) from coming into contact and causing a short circuit, and also prevents the anisotropic welding ribbon or anisotropic grid line on the second welding ribbon B (342) and the third cell plate (313A) from coming into contact and causing a short circuit, thereby further reducing the risk of a short circuit and improving the reliability of the cell assembly.

[0395] In one embodiment, referring to FIG. 22, in the first direction, the width of the extended section (3221) is,

[0396] 1mm≤L3≤l 31 +l 32 +l 33 And,

[0397] In the formula, L3 is the width of the extended section (3221) in the first direction, and l 31 is the gap between the fourth cell plate (314) and the third cell plate (313) in the cell string where the second insulation strip (322) is installed, and l 32 is the relative width distance from the edge of one end of the fourth cell plate (314) near the third cell plate (313) to the second welding point (362) in the cell string where the second insulation strip (322) is installed, and l 33It is installed in a cell string where the second insulating strip (322) is installed, and is the relative width distance between the edge of one end of the intermediate busbar (332) near the fourth cell plate (314) and the edge of one end of the third cell plate (313) near the fourth cell plate (314).

[0398] What can be understood is, l 31 +l 33 >1mm and l 31 <1mm, and therefore, by controlling L3≥1mm, the extension section (3221) can be secured to extend and cover the edge area of ​​the fourth cell plate (314A) and the edge area of ​​the third cell plate (313A), while leaving sufficient shift space for the horizontal tolerance of the equipment placement during the manufacturing process and the laminate shift tolerance of the busbar extraction hole position, thereby allowing the second insulating strip (322) to have a small width shift in the width direction with respect to the intermediate busbar (332) and the second insulating strip (322) to have a small width shift with respect to the two cell plates.

[0399] If the width of the extension section (3221) is excessively small, the risk of short circuit increases and the reliability of the cell assembly decreases; as the width of the extension section (3221) increases, the reliability of the cell assembly increases, and the displacement shift in the width direction of the second insulation strip (322) allowed in the manufacturing process with respect to the intermediate busbar (332) and the second insulation strip (322) with respect to the two cell plates increases, and the production precision requirement decreases. However, if the width of the extension section (3221) is excessively large, it affects sufficient welding between the second welding ribbon B (342) and the effective welding position on the fourth cell plate (314A), thereby reducing the current collection effect and affecting the double-sided efficiency rate of the cell assembly. It is understandable that the second welding point (362) is at the edge of the effective welding position of the fourth cell plate (314A) closest to the third cell plate (313A) (i.e., the second welding ribbon on the fourth cell plate (314A)). B (342) is located at the connection point of the outermost edge, and the second welding point (362) may be a grid line or a welding pad, and in an embodiment of the present invention, 1mm≤L3≤l 31 +l 32 +l 33 By controlling it in this way, on the basis of allowing a shift error to exist during the manufacturing process, the extension section (3221) of the second insulating strip (322) is still secured to extend and cover the edge area of ​​the fourth cell plate (314A) and the edge area of ​​the third cell plate (313A), thereby further improving the reliability and production yield of the cell assembly, while at the same time, it is possible to avoid causing unnecessary material waste and prevent it from affecting the sufficient welding of the second welding ribbon B (342).

[0400] In one embodiment, in the first direction, the width of the extended section (3221) is,

[0401] 1mm≤L3≤l 31 +l 33 It is +4mm, and

[0402] In the formula, L3 is the width of the extended section (3221) in the first direction, and l 31 is the gap between the fourth cell plate (314) and the third cell plate (313) in the cell string where the second insulation strip (322) is installed, and l 33 It is the relative width distance between the edge of one end of the intermediate busbar (332) near the fourth cell plate (314) and the edge of one end of the third cell plate (313) near the fourth cell plate (314) in the cell string where the second insulating strip (322) is installed.

[0403] Within this range, on the basis of allowing a shift error to exist during the manufacturing process, the extension section (3221) of the second insulating strip (322) is still secured to extend and cover the edge area of ​​the fourth cell plate (314A) and the edge area of ​​the third cell plate (313A), thereby further improving the reliability and production yield of the cell assembly, while at the same time, it is possible to ensure that unnecessary material waste is not caused and that even if the first insulating strip (321) shifts during manufacturing, it is not affected by the sufficient welding of the second welding ribbon B, thereby effectively reducing production precision.

[0404] Those skilled in the art will clearly understand that, for ease and brevity of explanation, the structure and implementation principle of the back contact cell described above can be referenced to the corresponding structure and implementation principle in Example 17 described above, and will not be explained again here.

[0405] Example 18

[0406] The difference between the present embodiment and embodiment 17 is, with reference to FIGS. 16, 23 and 24, that in a cell string with a second insulating strip (322) installed, one end of the third cell plate (313) near the fourth cell plate (314) and the fourth cell plate (314) are at least partially laminated.

[0407] In the first direction, the width of the extension section (3221) is greater than the width of the stacking area between the third cell plate (313) and the fourth cell plate (314).

[0408] That is, since the third cell plate (313A) and the fourth cell plate (314A) use an overlapping installation method, there is no gap between the two cells.

[0409] In one embodiment, one side of the third cell plate (313A) oriented on the second insulating strip (322) and the fourth cell plate (314A) are at least partially laminated.

[0410] In another embodiment, one side of the third cell plate (313A) pointing to the first insulating strip (222) and the fourth cell plate (314A) are at least partially laminated.

[0411] In one embodiment, referring to FIGS. 23 and 24, in the first direction, the width of the extended section (3221) is,

[0412] 1mm≤L4≤l 42 +l 43 -l 41 And,

[0413] In the formula, L4 is the width of the extended section (3221) in the first direction, and l 41 is the width of the stacked area between the third cell plate (313) and the fourth cell plate (314), and l 42 is the relative width distance from the edge of one end of the fourth cell plate (314) near the third cell plate (313) to the second welding point (362) in the cell string where the second insulation strip (322) is installed, and l 43 It is installed in a cell string where the second insulating strip (322) is installed, and is the relative width distance between the edge of one end of the intermediate busbar (332) near the fourth cell plate (314) and the edge of one end of the third cell plate (313) near the fourth cell plate (314).

[0414] What can be understood is, l 41 +l 43 >1mm and l 41 <1mm, and therefore, by controlling L4≥1mm, the extension section (3221) can be secured to extend and cover the edge area of ​​the fourth cell plate (314A) and the edge area of ​​the third cell plate (313A), while leaving sufficient shift space for the horizontal tolerance of the equipment placement during the manufacturing process and the laminate shift tolerance of the busbar extraction hole position, thereby allowing the second insulating strip (322) to have a small width shift in the width direction with respect to the intermediate busbar (332) and the second insulating strip (322) to have a small width shift with respect to the two cell plates.

[0415] In one embodiment, referring to FIGS. 23 and 24, in the first direction, the width of the extended section (3221) is,

[0416] 1mm≤L4≤l 43 -l 41 It is +4mm, and

[0417] In the formula, L4 is the width of the extended section (3221) in the first direction, and l 41 is the width of the stacked area between the third cell plate (313) and the fourth cell plate (314), and l 42 is the relative width distance of the second welding point (362) from the edge of one end of the fourth cell plate (314) near the third cell plate (313) in the cell string where the second insulating strip (322) is installed, and l 43 It is installed in a cell string where the second insulating strip (322) is installed, and is the relative width distance between the edge of one end of the intermediate busbar (332) near the fourth cell plate (314) and the edge of one end of the third cell plate (313) near the fourth cell plate (314).

[0418] In the description of this specification, the reference terms such as “some embodiments,” “exemplary,” “example,” or “e.g.” mean that specific features, structures, materials, or characteristics described by combining embodiments or examples are included in at least one embodiment or example of the present invention. In this specification, general expressions of the terms described above do not necessarily refer to the same embodiment or example. Furthermore, specific features, structures, materials, or characteristics described may be combined in an appropriate manner in any one or more embodiments or examples.

[0419] The foregoing is merely a relatively preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the foregoing has already been disclosed as a relatively preferred embodiment of the present invention, it is not intended to limit the present invention. Any person skilled in the art familiar with the present field would consider any partial change or modification using the technical content presented above as an equivalent embodiment of an equivalent change, provided that it does not deviate from the scope of the technical solution of the present invention. Any simple modification, equivalent change, or modification to the above embodiments according to the technical concept of the present invention, provided that it does not deviate from the content of the technical solution of the present invention, would all still fall within the scope of the solution of the present invention.

Claims

Claim 1 A back contact cell assembly comprising a cell string, an insulating strip, and a bus bar, wherein the cell string comprises a plurality of serially connected cell plates, and the plurality of cell plates are distributed along a first direction; the insulating strip is installed on the light distribution surface of the cell plate along a second direction, and the first direction and the second direction are set to intersect; the bus bar is installed on one side of the insulating strip far from the cell plate along the second direction, and the insulating strip covers the surface of the bus bar close to the cell plate; the cell string comprises adjacent first cell plates and second cell plates, and the insulating strip is installed on the light distribution surface of the first cell plate, and a second welding ribbon connects the second cell plate and the bus bar, respectively, and the insulating strip isolates the second welding ribbon and the first cell plate. Claim 2 A back contact cell assembly according to claim 1, characterized in that in the second direction, the insulating strip covers the busbar, and in the first direction, the insulating strip covers and exceeds the busbar. Claim 3 A back contact cell assembly according to claim 1, wherein the back contact cell assembly further comprises a welding ribbon, the welding ribbon comprises a first welding ribbon and a second welding ribbon, the first welding ribbon is for connecting adjacent cell plates, and the second welding ribbon is for connecting cell plates and busbars. Claim 4 A back contact cell assembly according to paragraph 3, characterized in that the second welding ribbon is installed on one side of the busbar far from the insulating strip, or the second welding ribbon is installed on one side of the busbar close to the insulating strip. Claim 5 A back contact cell assembly according to claim 1, characterized in that the first cell plate and the second cell plate are installed at least partially stacked. Claim 6 A back contact cell assembly according to claim 5, wherein when the light-dispatch surface of the first cell plate and the light-input surface of the second cell plate are at least partially laminated, the insulating strip is at least partially connected to the light-dispatch surface of the second cell plate. Claim 7 A back contact cell assembly according to claim 1, wherein the cell plate is rectangular, and the cell plate further includes a chamfered edge and a cutting edge, and the chamfered edge and the cutting edge are both distributed on both sides of the cell plate along the first direction, and the first direction and the second direction are set to be perpendicular. Claim 8 A back contact cell assembly characterized in that, in the first direction, the chamfered edge of the cell plate adjacent to the chamfered edge of the cell plate is installed via a docking connection, and the cutting edge of the cell plate adjacent to the cutting edge of the cell plate is installed via a docking connection; or in the first direction, the cutting edge of the cell plate adjacent to the chamfered edge of the cell plate is installed via a docking connection, and the chamfered edge of the cell plate adjacent to the cutting edge of the cell plate is installed via a docking connection. Claim 9 A back contact cell assembly according to claim 8, characterized in that the chamfered edge of each cell plate is laminated and installed on the light distribution surface on the side where the cutting edge of an adjacent cell plate is located. Claim 10 A back contact cell assembly comprises a cell string, a first insulating strip, a first busbar, and a second welding ribbon A, wherein the cell string comprises cell plates arranged in series with each other, and the cell plates comprise a fifth cell plate and a sixth cell plate arranged along a first direction; the first insulating strip is installed at one end of the sixth cell plate near the fifth cell plate; the first busbar is installed on one side of the first insulating strip oriented toward the sixth cell plate, and both the first insulating strip and the first busbar are installed extending along a second direction, and the first direction and the second direction are set to intersect; and the second welding ribbon A is for electrically connecting the first busbar and the fifth cell plate; A back contact cell assembly characterized in that, in a first direction, a first width extension section and a second width extension section are installed at both ends of the first insulation strip, extending to the outside of the first busbar edge, and the first width extension section and the second width extension section are installed sequentially along a direction far from the fifth cell plate, and the width of the second width extension section is smaller than the width of the first width extension section. Claim 11 A back contact cell assembly according to claim 10, characterized in that the first width extension section extends at least partially to the outside of the edge of the sixth cell plate. Claim 12 A back contact cell assembly according to claim 11, characterized in that, in the first direction, the orthographic projection of the first width extension section in the thickness direction of the sixth cell plate and the orthographic projection of the fifth cell plate in the thickness direction of the sixth cell plate overlap at least partially. Claim 13 A back contact cell assembly according to claim 10, characterized in that, in the first direction, the width D2 of the second width extension section is ≥1mm. Claim 14 In item 10, the above-mentioned 5th cell plate and the above-mentioned 6th cell plate are installed on the same plane, and 1mm < D1 ≤ l 11 +l 12 +l 13 And, in the formula, D1 is the width of the first width extension section in the first direction, and l 11 is the relative width distance between the edge of one end of the sixth cell plate near the fifth cell plate from the first busbar in the first direction, and l 12 is the gap between the fifth cell plate and the sixth cell plate, and l 13 A back contact cell assembly characterized by a relative width distance from the edge of one end of the fifth cell plate near the sixth cell plate to a first welding point, wherein the first welding point is installed at one end of the fifth cell plate near the sixth cell plate and is intended to be connected to the second welding ribbon A. Claim 15 In paragraph 10, one end of the sixth cell plate near the fifth cell plate and the fifth cell plate are at least partially laminated, and 1mm < D1 ≤ l 21 +l 23 -l 22 And, in the formula, D1 is the width of the first width extension section in the first direction, and l 21 is the relative width distance between the edge of one end of the sixth cell plate near the fifth cell plate from the first busbar in the first direction, and l 22 is the width of the stacked area between the fifth cell plate and the sixth cell plate in the first direction above, and l 23 A back contact cell assembly characterized by a relative width distance from the edge of one end of the fifth cell plate near the sixth cell plate to a first welding point, wherein the first welding point is installed at one end of the fifth cell plate near the sixth cell plate and is intended to be connected to the second welding ribbon A. Claim 16 A back contact cell assembly according to claim 10, wherein the cell assembly further comprises a front plate, the cell string is installed on the front plate, the front plate has a first edge and a second edge arranged along a second direction, and the orthographic projection of the first insulating strip in the thickness direction of the sixth cell plate is located between the first edge and the second edge. Claim 17 A back contact cell assembly according to claim 10, characterized in that the orthographic projection of the first busbar in the thickness direction of the sixth cell plate is located within the sixth cell plate. Claim 18 A back contact cell assembly according to claim 10, wherein the cell assembly comprises at least one serial cell string group, and the same serial cell string group comprises two cell strings arranged along a second direction and installed in series with each other, and in the same serial cell string group, extending from a sixth cell plate of one cell string to a sixth cell plate of another cell string through the same first busbar. Claim 19 In claim 10, a fourth cell plate is installed at one end of each cell string far from the fifth cell plate, and a third cell plate is installed at one end of the fourth cell plate close to the fifth cell plate; the back contact cell assembly further comprises a second insulating strip, an intermediate busbar, and a second welding ribbon B, wherein the second insulating strip is installed at the edge of the third cell plate among the cell strings, and the second insulating strip is installed at one end of the third cell plate close to the fourth cell plate; the intermediate busbar is for parallelizing two cell strings installed adjacently in a first direction, and the intermediate busbar is installed on one side of the second insulating strip oriented toward the third cell plate, and both the second insulating strip and the intermediate busbar are installed extending along a second direction; A back contact cell assembly characterized in that the second welding ribbon B is for electrically connecting the intermediate busbar, the fourth cell plate in the cell string, and the fourth cell plate in another cell string adjacent to the cell string in a first direction. Claim 20 A back contact cell assembly according to claim 19, wherein, in a first direction, a first external extension section and a second external extension section are installed at both ends of the second insulating strip, extending to the outside of the intermediate busbar edge, and the first external extension section and the second external extension section are installed sequentially along a direction away from the fourth cell plate, wherein the first external extension section extends at least partially to the outside of the edge of the third cell plate, and the width of the second external extension section is smaller than the width of the first external extension section. Claim 21 A back contact cell assembly comprising a parallel cell string group, a second insulating strip, an intermediate busbar, and a second welding ribbon B, wherein the same parallel cell string group comprises at least two cell strings arranged along a first direction and installed in parallel with each other, each cell string comprises a cell plate arranged in series with each other, wherein the cell plates arranged in series with each other comprise a third cell plate and a fourth cell plate arranged along the first direction, and the fourth cell plate of the two cell strings installed in parallel with each other is installed adjacently in the first direction; A second insulating strip is installed at the edge of the third cell plate in the cell string, and the second insulating strip is also installed at one end of the third cell plate near the fourth cell plate; an intermediate busbar is for parallelizing two adjacent cell strings in a first direction, and the intermediate busbar is installed on one side of the second insulating strip oriented toward the third cell plate, and both the second insulating strip and the intermediate busbar are installed extending along the second direction; a second welding ribbon B is for electrically connecting the intermediate busbar, the fourth cell plate in the cell string where the intermediate busbar is located, and the fourth cell plate in another cell string adjacent to the cell string in the first direction; in the first direction, a first outer extension section and a second outer extension section are installed at both ends of the second insulating strip, extending outside the edge of the intermediate busbar, and the first outer extension section and the second outer extension section are on the fourth cell plate A back contact cell assembly characterized by being installed sequentially along a direction of separation, wherein the width of the second external extension section is smaller than the width of the first external extension section. Claim 22 A back contact cell assembly according to claim 21, characterized in that the first external extension section extends at least partially to the outside of the edge of the third cell plate. Claim 23 A back contact cell assembly according to claim 22, characterized in that, in the first direction, the orthographic projection of the first outer extension section in the thickness direction of the third cell plate and the orthographic projection of the fourth cell plate in the thickness direction of the third cell plate overlap at least partially. Claim 24 A back contact cell assembly according to claim 21, characterized in that, in the first direction, the width d2 of the second outer extension section is ≥1mm. Claim 25 In claim 21, the fourth cell plate and the third cell plate are installed on the same plane, and 1mm < d1 ≤ l 31 +l 32 +l 33 And, in the formula, d1 is the width of the first outer extension section in the first direction, and l 31 is the relative width distance between the edge of one end of the third cell plate near the fourth cell plate from the intermediate busbar in the first direction in the cell string where the intermediate busbar is installed, and l 32 is the gap between the fourth cell plate and the third cell plate in the cell string where the intermediate busbar is installed, and l 33 A back contact cell assembly characterized in that the distance is the relative width from the edge of one end of the fourth cell plate near the third cell plate to the second welding point in the cell string where the intermediate busbar is installed, and the second welding point is installed on the fourth cell plate in the cell string where the intermediate busbar is located, and is also installed at one end of the fourth cell plate near the third cell plate, for connecting with each other with the second welding ribbon B. Claim 26 In claim 21, in the cell string where the intermediate busbar is installed, one end of the third cell plate near the fourth cell plate and the fourth cell plate are at least partially laminated, and 1mm < d1 ≤ l 41 +l 43 -l 42 And, in the formula, d1 is the width of the first outer extension section in the first direction, and l 41 is the relative width distance between the edge of one end of the third cell plate near the fourth cell plate from the intermediate busbar in the first direction in the cell string where the intermediate busbar is installed, and l 42 is the width of the stacked area between the third cell plate and the fourth cell plate in the first direction, and l 43 A back contact cell assembly characterized in that, in the cell string where the intermediate busbar is installed, the distance is the relative width from the edge of one end of the fourth cell plate near the third cell plate to the second welding point, and the second welding point is installed at one end of the fourth cell plate near the third cell plate to be connected to each other with the second welding ribbon B. Claim 27 A back contact cell assembly according to claim 21, wherein the cell assembly further comprises a front plate, the cell string is installed on the front plate, the front plate has a first edge and a second edge arranged along a second direction, and the orthographic projection of the second insulating strip in the thickness direction of the third cell plate is located between the first edge and the second edge. Claim 28 A back contact cell assembly comprises a cell string, a first insulating strip, a first busbar, and a second welding ribbon A, wherein the cell string comprises cell plates arranged in series with each other, and the cell plates comprise a fifth cell plate and a sixth cell plate arranged along a first direction; the first insulating strip is installed at one end of the sixth cell plate near the fifth cell plate; the first busbar is installed on one side of the first insulating strip oriented toward the sixth cell plate, and both the first insulating strip and the first busbar are installed extending along a second direction, and the first direction and the second direction are set to intersect; the second welding ribbon A is for electrically connecting the first busbar and the fifth cell plate; an external extension section protruding outside the first busbar is installed at one end of the first insulating strip near the fifth cell plate, and the external extension section extends to the outside of the sixth cell plate, and in the thickness direction of the sixth cell plate, the orthographic projection of the external extension section and the A back contact cell assembly characterized in that the orthographic projection of the fifth cell plate overlaps at least partially. Claim 29 A back contact cell assembly according to claim 28, wherein the fifth cell plate and the sixth cell plate are installed on the same plane; and in the first direction, the width of the portion of the outer extension section protruding outside the sixth cell plate is greater than the gap between the fifth cell plate and the sixth cell plate. Claim 30 In Clause 29, in the first direction above, the width of the outer extension section is 1mm ≤ L1 ≤ l 11 +l 12 +l 13 And, in the formula, L1 is the width of the outer extension section in the first direction, and l 11 is the gap between the 5th cell plate and the 6th cell plate, and l 12 is the relative width distance from the edge of one end of the fifth cell plate near the sixth cell plate to the first welding point, the first welding point is for connecting to the second welding ribbon A, and is also installed at one end of the fifth cell plate near the sixth cell plate, l 13 A back contact cell assembly characterized by being the relative width distance between the edge of one end of the first busbar near the fifth cell plate and the edge of one end of the sixth cell plate near the fifth cell plate. Claim 31 In Clause 29, in the first direction above, the width of the outer extension section is 1mm ≤ L1 ≤ l 11 +l 13 +4mm, and in the formula, L1 is the width of the outer extension section in the first direction, and l 11 is the gap between the 5th cell plate and the 6th cell plate, and l 13 A back contact cell assembly characterized by being the relative width distance between the edge of one end of the first busbar near the fifth cell plate and the edge of one end of the sixth cell plate near the fifth cell plate. Claim 32 A back contact cell assembly according to claim 28, wherein one end of the sixth cell plate near the fifth cell plate and the fifth cell plate are at least partially laminated; and in a first direction, the width of the outer extension section is greater than the width of the laminated area between the fifth cell plate and the sixth cell plate. Claim 33 In Clause 32, the width of the external extension section is 1mm ≤ L2 ≤ l 22 +l 23 -l 21 And, in the formula, L2 is the width of the outer extension section in the first direction, and l 21 is the width of the stacked area between the fifth cell plate and the sixth cell plate, and l 22 is the relative width distance from the edge of one end of the fifth cell plate near the sixth cell plate to the first welding point, the first welding point is for connecting to the second welding ribbon A, and is also installed at one end of the fifth cell plate near the sixth cell plate, l 23 A back contact cell assembly characterized by being the relative width distance between the edge of one end of the first busbar near the fifth cell plate and the edge of one end of the sixth cell plate near the fifth cell plate. Claim 34 In Clause 32, the width of the external extension section is 1mm ≤ L2 ≤ l 23 +4mm-l 21 And, in the formula, L2 is the width of the outer extension section in the first direction, and l 21 is the width of the stacked area between the fifth cell plate and the sixth cell plate, and l 23 A back contact cell assembly characterized by being the relative width distance between the edge of one end of the first busbar near the fifth cell plate and the edge of one end of the sixth cell plate near the fifth cell plate. Claim 35 A back contact cell assembly according to claim 28, wherein the cell assembly comprises at least one serial cell string group, and the same serial cell string group comprises two cell strings arranged along a second direction and installed in series with each other, and in the same serial cell string group, extending from a sixth cell plate of one cell string to a sixth cell plate of another cell string through the same first busbar. Claim 36 In paragraph 28, a fourth cell plate is installed at one end of each cell string far from the fifth cell plate, and a third cell plate is installed at one end of the fourth cell plate close to the fifth cell plate; the cell assembly comprises a parallel cell string group, the same parallel cell string group comprises at least two cell strings arranged along a first direction and installed in parallel with each other, and the fourth cell plates of the two cell strings installed in parallel with each other are installed adjacently in the first direction; the back contact cell assembly further comprises a second insulating strip, an intermediate busbar, and a second welding ribbon B, the second insulating strip is installed at the edge of the third cell plate in the cell string, and the second insulating strip is installed at one end of the third cell plate close to the fourth cell plate; A back contact cell assembly characterized in that an intermediate busbar is for parallelizing two cell strings installed adjacently in a first direction, said intermediate busbar is installed on one side of the second insulating strip oriented toward the third cell plate, and said second insulating strip and said intermediate busbar are both installed extending along a second direction; and a second welding ribbon B is for electrically connecting said intermediate busbar, the fourth cell plate in the cell string, and the fourth cell plate in another cell string adjacent to said cell string in the first direction. Claim 37 A back contact cell assembly according to claim 36, wherein an extension section protruding outside the intermediate busbar is installed at one end of the second insulating strip near the fourth cell plate, and the extension section extends outside the third cell plate, and in the thickness direction of the third cell plate, the orthographic projection of the extension section and the orthographic projection of the fourth cell plate in the cell string where the extension section is located overlap at least partially. Claim 38 A back contact cell assembly comprises a parallel cell string group, a second insulating strip, an intermediate busbar, and a second welding ribbon B, wherein the same parallel cell string group comprises at least two cell strings arranged along a first direction and installed in parallel with each other, each cell string comprises a cell plate arranged in series with each other, wherein the cell plate comprises a third cell plate and a fourth cell plate arranged along the first direction, and the fourth cell plate of the two cell strings installed in parallel with each other is installed adjacently in the first direction; the second insulating strip is installed at the edge of the third cell plate of the cell string, and the second insulating strip is installed at one end of the third cell plate near the fourth cell plate; the intermediate busbar is for parallelizing the two cell strings installed adjacently in the first direction, and the intermediate busbar is installed on one side of the second insulating strip oriented toward the third cell plate, and both the second insulating strip and the intermediate busbar are installed extending along the second direction; and the second welding ribbon B is for electrically connecting the intermediate busbar, the fourth cell plate in the cell string where the intermediate busbar is located, and the fourth cell plate in another cell string adjacent to the cell string in a first direction; and at one end of the second insulating strip near the fourth cell plate, an extension section protruding outside the intermediate busbar is installed, the extension section extends outside the third cell plate, and in the thickness direction of the third cell plate, the orthographic projection of the extension section and the orthographic projection of the fourth cell plate in the cell string where the extension section is located overlap at least partially, characterized by a back contact cell assembly. Claim 39 A back contact cell assembly according to claim 38, wherein in the cell string on which the insulating strip is installed, the fourth cell plate and the third cell plate are installed on the same plane, and in the first direction, the width of the portion protruding outside the third cell plate of the extension section is greater than the gap between the fourth cell plate and the third cell plate. Claim 40 In Clause 39, in the first direction above, the width of the extension section is 1mm ≤ L3 ≤ l 31 +l 32 +l 33 And, in the formula, L3 is the width of the extension section in the first direction, and l 31 is the gap between the fourth cell plate and the third cell plate in the cell string where the second insulation strip is installed, and l 32 is the relative width distance from the edge of one end of the fourth cell plate near the third cell plate to the second welding point in the cell string where the second insulation strip is installed, and l 33 A back contact cell assembly characterized by being installed on the cell string in which the second insulating strip is installed, and having a relative width distance between the edge of one end of the intermediate busbar near the fourth cell plate and the edge of one end of the third cell plate near the fourth cell plate. Claim 41 In Clause 40, in the first direction above, the width of the extension section is 1mm ≤ L3 ≤ l 31 +l 33 +4mm, and in the formula, L3 is the width of the extension section in the first direction, and l 31 is the gap between the fourth cell plate and the third cell plate in the cell string where the second insulation strip is installed, and l 33 A back contact cell assembly characterized by being the relative width distance between the edge of one end of the intermediate busbar near the fourth cell plate and the edge of one end of the third cell plate near the fourth cell plate in the cell string where the second insulating strip is installed. Claim 42 A back contact cell assembly according to claim 38, wherein, in the cell string where the second insulating strip is installed, one end of the third cell plate near the fourth cell plate and the fourth cell plate are at least partially laminated, and in the first direction, the width of the extended section is greater than the width of the laminated area between the third cell plate and the fourth cell plate. Claim 43 In Clause 42, in the first direction above, the width of the extension section is 1mm ≤ L4 ≤ l 42 +l 43 - l 41 And, in the formula, L4 is the width of the extension section in the first direction, and l 41 is the width of the stacked area between the third cell plate and the fourth cell plate, and l 42 is the relative width distance from the edge of one end of the fourth cell plate near the third cell plate to the second welding point in the cell string where the second insulation strip is installed, and l 43 A back contact cell assembly characterized by being installed on the cell string in which the second insulating strip is installed, and having a relative width distance between the edge of one end of the intermediate busbar near the fourth cell plate and the edge of one end of the third cell plate near the fourth cell plate. Claim 44 In Clause 42, in the first direction above, the width of the extension section is 1mm ≤ L4 ≤ l 43 -l 41 +4mm, and in the formula, L4 is the width of the extension section in the first direction, and l 41 is the width of the stacked area between the third cell plate and the fourth cell plate, and l 42 is the relative width distance from the edge of one end of the fourth cell plate near the third cell plate to the second welding point in the cell string where the second insulation strip is installed, and l 43 A back contact cell assembly characterized by being installed on the cell string in which the second insulating strip is installed, and having a relative width distance between the edge of one end of the intermediate busbar near the fourth cell plate and the edge of one end of the third cell plate near the fourth cell plate. Claim 45 A solar photovoltaic system characterized by comprising a back contact cell assembly according to any one of claims 1 to 44.

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