Patent Description:
A solar cell generates electricity through converting sunlight into electric energy by means of a photovoltaic effect of a semiconductor p-n junction, which is a sustainable source of clean energy.

Conventionally, a plurality of solar cells is usually connected as a whole by using a ribbon, so as to be packaged into a cell module by using processes such as laying, lamination, and the like. However, due to the thermal mismatch between the ribbon and the solar cells, that is, different proportional coefficients of thermal expansion and contraction with temperature variation, solar cells and ribbons could be squeezed in cracks and fragments, because the stress between the solar cells and the ribbon is too big to release. Thermal expansion and contraction of the ribbon may also cause the cells to be subjected to an expansion stress of the ribbon, resulting in cracks and fragmenting of the solar cells. The ribbons in <CIT> and <CIT>, include a body and extensions that extend outward from two sides of the body and that are staggered with each other.

Based on this, how to design a ribbon to minimize the damage of stress to the solar cells becomes a problem to be resolved.

This application provides a special-figure design ribbon for connecting back contact cells, to resolve a problem of how to design a ribbon to minimize the damage of stress to the solar cells.

According to a first aspect, a special-figure design ribbon for connecting back contact cells provided in this application includes the features of claim <NUM>.

Optionally, the set of slits include a first slit, a second slit, a third slit, a fourth slit, and a fifth slit, the first slit is located in the middle of the set of slits, and the second slit and the third slit are respectively located on two sides of the first slit; the fourth slit is located on a side of the second slit facing away from the first slit, and the fifth slit is located on a side of the third slit facing away from the first slit; and
lengths of the set of slits satisfy the following relationship:
<MAT> where
L1 is the length of the first slit, L2 is the length of the second slit, L3 is the length of the third slit, L4 is the length of the fourth slit, and L5 is the length of the fifth slit.

Optionally, the special-figure design ribbon for connecting back contact cells connects a first cell to a second cell, and the body includes a first connecting portion covering the first cell, a second connecting portion covering the second cell, and a third connecting portion covering a gap between the first cell and the second cell;.

dimensions of the special-figure design ribbon for connecting back contact cells satisfy the following relationship: <MAT> where
d1 is a width of the first connecting portion, L2 is the length of the second slit, and L3 is the length of the third slit.

Optionally, a distance between two adjacent slits in the set of slits satisfies the following relationship: <MAT> where
L1 is the length of the first slit, S1 is a distance between the first slit and the second slit, and S2 is a distance between the second slit and the fourth slit; and/or <MAT> where
L1 is the length of the first slit, S3 is a distance between the first slit and the third slit, and S4 is a distance between the third slit and the fifth slit.

Optionally, each first solder joint corresponds to a set of slits, and a slit in the set of slits at a larger distance from the corresponding first solder joint in a length direction is at a smaller distance from the corresponding first solder joint in the width direction; and/or
each second solder joint corresponds to a set of slits, and a slit in the set of slits at a larger distance from the corresponding second solder joint in a length direction is at a smaller distance from the corresponding second solder joint in the width direction.

Optionally, each first solder joint corresponds to a set of slits, and distances between two adjacent slits in the set of slits are equal; and/or
each second solder joint corresponds to a set of slits, and distances between two adjacent slits in the set of slits are equal.

A plurality of slits is provided, and directions in which the plurality of slits stretch are parallel to the width direction of the body.

Optionally, a width of the each slit ranges from <NUM> to <NUM>.

Optionally, a spacing between two adjacent slits ranges from <NUM> to <NUM>.

Optionally, a spacing between two adjacent sets of the slits ranges from <NUM> to <NUM>.

Optionally, the body further comprises a via, and another end of the slit is in communication with the via.

Optionally, the first solder joints are connected to the first cell, the second solder joints are connected to the second cell, the via is in an elliptical shape, a length of a short axis of the via is a width of the gap between the first cell and the second cell, and a long axis of the via coincides with a center line of the body.

Optionally, the via is in an elliptical shape, a circular shape, a semicircular shape, or a rhombus shape.

Optionally, two adjacent ones of a set of vias corresponding to each first solder joint are staggered from each other in the length direction.

Optionally, a width of the body ranges from <NUM> to <NUM>.

Optionally, a spacing between the first solder joint and the second solder joint adjacent to each other in the width direction of the body ranges from <NUM> to <NUM>.

Optionally, a thickness of the special-figure design ribbon for connecting back contact cells ranges from <NUM> to <NUM>.

Optionally, the special-figure design ribbon for connecting back contact cells includes a copper substrate and a tin layer coated on the copper substrate. Alternatively, the special-figure design ribbon for connecting back contact cells includes an aluminum substrate and a tin layer coated on the aluminum substrate. Alternatively, the special-figure design ribbon for connecting back contact cells is an aluminum strip. Alternatively, the special-figure design ribbon for connecting back contact cells is a tin strip.

Optionally, the plurality of first solder joints are equidistantly arranged on the first side of the body in a length direction of the body; and/or
the plurality of second solder joints are equidistantly arranged on the second side of the body in the length direction of the body.

Optionally, the body is in a rectangular shape. Alternatively, the body is in a bent shape, and the plurality of first solder joints and the plurality of second solder joints are disposed at bent corners.

Optionally, each first solder joint is in a rectangular shape, a rounded rectangular shape, a circular shape, a semicircular shape, or a trapezoid shape; and/or each second solder joint is in a rectangular shape, a rounded rectangular shape, a circular shape, a semicircular shape, or a trapezoid shape.

Optionally, an included angle ranging from <NUM>° to <NUM>° is formed between a line connecting each first solder joint to each second solder joint closest to the first solder joint and a length direction of the ribbon.

Optionally, the special-figure design ribbon for connecting back contact cells connects a first cell to a second cell, each first solder joint is connected to a positive electrode of the first cell, each second solder joints are connected to a negative electrode of the second cell, and an area of the first solder joint is greater than or equal to an area of the second solder joint; or each first solder joint is connected to a negative electrode of the first cell, each second solder joints are connected to a positive electrode of the second cell, and the area of the second solder joint is greater than or equal to the area of the first solder joint.

In the special-figure design ribbon for connecting back contact cells according to the embodiments of this application, since the plurality of first solder joints and the plurality of second solder joints respectively located on two sides of the body are staggered from each other in the width direction of the body, and/or the first solder joints and the second solder joints have different shapes. Therefore, expansion stress may be more effectively absorbed by means of deformation of the special-figure design ribbon for connecting back contact cells, thereby minimizing the damage of the stress to the solar cells.

<FIG> is a schematic diagram of a part of a structure of a special-figure design ribbon for connecting back contact cells according to an embodiment of this application, not part of the invention.

<FIG> is a schematic structural diagram of a special-figure design ribbon for connecting back contact cells according to an embodiment of this application, not part of the invention.

<FIG> is a schematic structural diagram of a special-figure design ribbon for connecting back contact cells according to an embodiment of this application.

<FIG> is a schematic diagram of a part of a structure of a special-figure design ribbon for connecting back contact cells according to an embodiment of this application.

To make objectives, technical solutions, and advantages of this application clearer and more comprehensible, this application is further described in detail with reference to the accompanying drawings and embodiments, It is to be understood that the specific embodiments described herein are merely used for explaining this application but are not intended to limit this application.

Referring to <FIG>, a special-figure design ribbon <NUM> for connecting back contact cells according to an embodiment of this application includes a body <NUM>, a plurality of first solder joints <NUM>, and a plurality of second solder joints <NUM>. The plurality of first solder joints <NUM> and the plurality of second solder joints <NUM> are respectively located on two sides of the body <NUM> in a width direction. Each of the first solder joints <NUM> stretches outward from a first side of the body <NUM>. Each of the second solder joints <NUM> stretches outward from a second side of the body <NUM>. A shape of each first solder joint <NUM> is different from a shape of each second solder joint <NUM>. Center lines of at least one set of the first solder joint <NUM> and the second solder joint <NUM> adjacent to each other are staggered from each other in the width direction of the body <NUM>.

In the special-figure design ribbon <NUM> for connecting back contact cells according to the embodiments of this application, since the plurality of first solder joints <NUM> and the plurality of second solder joints <NUM> respectively located on two sides of the body <NUM> are staggered from each other in the width direction of the body <NUM>, and/or the first solder joints <NUM> and the second solder joints <NUM> have different shapes. Therefore, expansion stress may be more effectively absorbed by means of deformation of the special-figure design ribbon <NUM> for connecting back contact cells, thereby minimizing the damage of the stress to the solar cells.

It may be understood that the ribbon <NUM> absorbs stresses in a length direction, the width direction, and a thickness direction by means of deformation.

Specifically, in the case of the deformation of the ribbon <NUM>, a position closer to the first solder joint <NUM> or the second solder joint <NUM> is subjected to a larger stress on a line segment formed by connecting the first solder joint <NUM> to the second solder joint <NUM> adjacent to each other.

It may be understood that different shapes or staggered center lines of the solder joints on the two sides may cause the special-figure design ribbon <NUM> for connecting back contact cells to be asymmetrical.

It may be understood that the solder joints on the two sides of the body <NUM> are staggered from each other, so that the body <NUM> between the solder joints is longer to absorb a stress deformation quantity, thereby absorbing tensile deformation and twist deformation more effectively.

It may be understood that the term that "a shape of each first solder joint <NUM> is different from a shape of each second solder joint <NUM>, and/or center lines of at least one set of the first solder joint <NUM> and the second solder joint <NUM> adjacent to each other are staggered from each other in the width direction of the body <NUM>" includes following three situations. The shape of the first solder joint <NUM> is different from the shape of the second solder joint <NUM>, and the center lines of at least one set of the first solder joint <NUM> and the second solder joint <NUM> adjacent to each other are staggered from each other in the width direction of the body <NUM>. The shape of the first solder joint <NUM> is different from the shape of the second solder joint <NUM>, and the center lines of all of the first solder joints <NUM> and the second solder joints <NUM> adjacent to each other coincide in the width direction of the body <NUM>. The shape of the first solder joint <NUM> is same as the shape of the second solder joint <NUM>, and the center lines of at least one set of the first solder joint <NUM> and the second solder joint <NUM> adjacent to each other are staggered from each other in the width direction of the body <NUM>. The last situation is used as an example for explanation and description herein, but this does not constitute a limitation on the above situations.

It may be understood that the term that "center lines of at least one set of the first solder joint <NUM> and the second solder joint <NUM> adjacent to each other are staggered from each other in the width direction of the body <NUM>" may mean that the center lines of a set of the first solder joint <NUM> and the second solder joint <NUM> adjacent to each other are staggered from each other in the width direction of the body <NUM>, or may mean that the center lines of a plurality of sets of the first solder joints <NUM> and the second solder joints <NUM> adjacent to each other are staggered from each other in the width direction of the body <NUM>, and the rest center lines of the first solder joints <NUM> and the second solder joints <NUM> adjacent to each other coincide in the width direction of the body <NUM>, or may mean that the center lines of all of the first solder joints <NUM> and the second solder joints <NUM> adjacent to each other are staggered from each other in the width direction of the body <NUM>. The last situation is used as an example for explanation and description herein, but this does not constitute a limitation on the above situations.

It may be understood that the term of "being staggered from each other in the width direction of the body <NUM>" means not overlapping in the width direction.

It may be understood that a center line <NUM> of the first solder joint is a line that passes through a center of the first solder joint <NUM> and is parallel to the width direction. A center line <NUM> of the second solder joint <NUM> is a line that passes through a center of the second solder joint <NUM> and is parallel to the width direction.

Referring to <FIG>, optionally, an included angle γ of <NUM>° to <NUM>° is formed between a line connecting each first solder joint <NUM> to each second solder joint <NUM> closest to the first solder joint <NUM> and a length direction of the ribbon <NUM>. Therefore, the first solder joint <NUM> and the second solder joint <NUM> are staggered from each other by an appropriate degree, which facilitates more effective absorption of the expansion stress by means of the deformation of the ribbon <NUM>, thereby minimizing the damage of the stress to the cells.

Specifically, the included angle γ is, for example, <NUM>°, <NUM>°, <NUM>°, <NUM>°, <NUM>°, <NUM>°, <NUM>°, <NUM>°, <NUM>°, <NUM>°, or <NUM>°.

Further, <NUM>° < γ < <NUM>°. The included angle is, for example, <NUM>°, <NUM>°, <NUM>°, <NUM>°, <NUM>°, or <NUM>°.

Preferably, γ is <NUM>°. In this way, the first solder joint <NUM> and the second solder joint can be staggered from each other by the most appropriate degree.

Referring to <FIG>, optionally, a thickness of the special-figure design ribbon <NUM> for connecting back contact cells ranges from <NUM> to <NUM>. For example, the thickness is <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, or <NUM>. Therefore, the thickness of the special-figure design ribbon <NUM> for connecting back contact cells is in an appropriate range, so as to avoid a poor expansion stress absorbing effect of the special-figure design ribbon <NUM> for connecting back contact cells or a poor mechanical strength of the special-figure design ribbon <NUM> for connecting back contact cells due to an excessively small thickness, and avoid relatively high costs of the special-figure design ribbon <NUM> for connecting back contact cells due to the excessively large thickness of the special-figure design ribbon <NUM> for connecting back contact cells.

Preferably, the thickness of the special-figure design ribbon <NUM> for connecting back contact cells is <NUM>. In this way, the expansion stress absorbing effect, the mechanical strength, and the costs of the special-figure design ribbon <NUM> for connecting back contact cells can be all taken into consideration, thereby achieving an optimal overall effect.

Referring to <FIG>, optionally, the special-figure design ribbon <NUM> for connecting back contact cells includes a copper substrate and a tin layer coated on the copper substrate. In this way, the special-figure design ribbon <NUM> for connecting back contact cells has better conductivity, so as to achieve a desirable effect of electrically connecting the solar cells.

Specifically, a hardness of the special-figure design ribbon <NUM> for connecting back contact cells ranges from <NUM> HV to <NUM> HV. For example, the hardness is <NUM> HV, <NUM> HV, <NUM> HV, <NUM> HV, <NUM> HV, <NUM> HV, <NUM> HV, <NUM> HV, or <NUM> HV. In this way, the special-figure design ribbon <NUM> for connecting back contact cells has a desirable mechanical strength.

Specifically, uniformity of the tin layer is ±<NUM>%. For example, the uniformity is -<NUM>%, -<NUM>%, -<NUM>%, -<NUM>%, <NUM>%, <NUM>%, <NUM>%, <NUM>%, or <NUM>%. In this way, the special-figure design ribbon <NUM> for connecting back contact cells has desirable conductivity.

Specifically, a thickness of the tin layer ranges from <NUM> to <NUM>. For example, the thickness is <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, or <NUM>.

In other embodiments, the special-figure design ribbon <NUM> for connecting back contact cells may alternatively include an aluminum substrate and a tin layer coated on the aluminum substrate. Alternatively, the special-figure design ribbon <NUM> for connecting back contact cells is an aluminum strip. Alternatively, the special-figure design ribbon <NUM> for connecting back contact cells is a tin strip.

Optionally, an elongation of the special-figure design ribbon <NUM> for connecting back contact cells is greater than or equal to <NUM>%. For example, the elongation is <NUM>%, <NUM>%, <NUM>%, or <NUM>%.

Referring to <FIG>, optionally, the body <NUM> is in a rectangular shape. In this way, the body <NUM> has a relatively regular shape and is convenient to manufacture.

Referring to <FIG>, optionally, the body <NUM> is in a bent shape. The first solder joint <NUM> and the second solder joint <NUM> are disposed at bent corners. In this way, the stress on the solar cells can be reduced by using the body <NUM> in the bent shape, thereby reducing the damage to the solar cells. In addition, the bent corners may also assist in positioning the first solder joint <NUM> and the second solder joint <NUM>, thereby enhancing the manufacturing efficiency. Further, the bent corners are obtuse angles. In this way, an angle of each bent corner is relatively large, so as to further reduce the stress on the solar cells. Further, the each bent corner is provided with one first solder joint <NUM> or one second solder joint <NUM>.

It may be understood that, in other embodiments, the body <NUM> may be alternately in the rectangular shape and the bent shape, or may be in other shapes. In other embodiments, the bent corner may be an acute angle, a right angle, or an arcuate angle, or may be at least two of the acute angle, the right angle, the obtuse angle, or the arcuate angle. In other embodiments, some of the bent corners may be provided with the first solder joint <NUM> or the second solder joint <NUM>, and the remaining bent corners may not be provided with the first solder joint <NUM> and the second solder joint <NUM>.

Referring to <FIG>, optionally, a width w0 of the body <NUM> ranges from <NUM> to <NUM>. For example, the width is <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, or <NUM>. In this way, the width w0 of the body <NUM> is in an appropriate range, so as to avoid a poor expansion stress absorbing effect of the special-figure design ribbon <NUM> for connecting back contact cells or the special-figure design ribbon <NUM> for connecting back contact cells incapable of being connected to the solar cells due to an excessively small width w0 of the body <NUM>, and avoid relatively high costs of the special-figure design ribbon <NUM> for connecting back contact cells due to the excessively large width w0 of the body <NUM>. A tolerance of the width w0 of the body <NUM> may be ±<NUM>.

Preferably, the width w0 of the body <NUM> is <NUM>. In this way, the expansion stress absorbing effect, connection to the solar cells, and the costs of the special-figure design ribbon <NUM> for connecting back contact cells can be all taken into consideration, thereby achieving an optimal overall effect.

Referring to <FIG>, optionally, a length L0 of the body <NUM> ranges from <NUM> to <NUM>. For example, the length is <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, or <NUM>. A tolerance of the length L0 of the body <NUM> may be ±<NUM>.

Preferably, the length L0 of the body <NUM> is <NUM>.

Referring to <FIG>, optionally, each first solder joint <NUM> stretches outward from a first side of the body <NUM> in the width direction of the body <NUM>. Each second solder joint <NUM> stretches outward from the second side of the body <NUM> in the width direction of the body <NUM>. In this way, the first solder joint <NUM> and the second solder joint <NUM> are regularly disposed, which is convenient for manufacturing.

It may be understood that, in other embodiments, a direction in which each first solder joint <NUM> stretches outward from the side of the body <NUM> may be at an acute angle or an obtuse angle to the width direction of the body <NUM>. Some of the first solder joints <NUM> stretch outward from the side of the body <NUM> in the width direction of the body <NUM>, and a direction in which the remaining first solder joints <NUM> stretch outward from the side of the body <NUM> is at an acute angle or an obtuse angle to the width direction of the body <NUM>. A direction in which each second solder joint <NUM> stretches outward from the side of the body <NUM> may be at an acute angle or an obtuse angle to the width direction of the body <NUM>. Some of the second solder joints <NUM> stretch outward from the side of the body <NUM> in the width direction of the body <NUM>, and a direction in which the remaining second solder joints <NUM> stretch outward from the side of the body <NUM> is at an acute angle or an obtuse angle to the width direction of the body <NUM>. Specifically, in a case that the direction in which the plurality of first solder joints <NUM> stretch outward is at an acute angle or an obtuse angle to the width direction of the body <NUM>, corresponding angles formed by the plurality of first solder joints <NUM> may be the same or different. In a case that the direction in which the plurality of second solder joints <NUM> stretch outward is at an acute angle or an obtuse angle to the width direction of the body <NUM>, corresponding angles formed by the plurality of second solder joints <NUM> may be the same or different.

Referring to <FIG>, optionally, the plurality of first solder joints <NUM> are equidistantly arranged on a first side of the body <NUM> in a length direction of the body <NUM>. Optionally, the plurality of second solder joints <NUM> are equidistantly arranged on the second side of the body <NUM> in the length direction of the body <NUM>. In this way, the body <NUM> between the first solder joint <NUM> and the second solder joint <NUM> on each segment has the same capacity for absorbing the expansion stress, which is beneficial to further minimize the damage to the solar cells. In addition, the arrangement of the solder joints is relatively regular, which is convenient for manufacturing and can ensure that the center lines of adjacent solder joints are staggered from each other.

In other embodiments, a spacing between two adjacent first solder joints <NUM> may be different. Spacings between some of the two adjacent first solder joints <NUM> may be the same, and spacings between the remaining two adjacent first solder joints <NUM> may be different. Similarly, a spacing between two adjacent second solder joints <NUM> may be different. Spacings between some of the two adjacent second solder joints <NUM> may be the same, and spacings between the remaining two adjacent second solder joints <NUM> may be different. The specific arrangement mode of the solder joints is not limited herein.

Referring to <FIG>, optionally, a spacing S0 between the first solder joint <NUM> and the second solder joint <NUM> adjacent to each other in the width direction of the body <NUM> ranges from <NUM> to <NUM>. For example, the spacing is <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, or <NUM>. In this way, S0 may be in an appropriate range, so as to avoid poor deformability and the poor expansion stress absorbing effect caused by an excessive large or excessive small S0, which is beneficial to minimize the damage of the stress to the solar cells. A tolerance of the spacing S0 may be ±<NUM>.

Preferably, the spacing S0 between the first solder joint <NUM> and the second solder joint <NUM> adjacent to each other in the width direction of the body <NUM> is <NUM>. In this way, an optimal effect of reducing the damage of the stress to the solar cells can be achieved.

Optionally, the first solder joint <NUM> is in a rectangular shape, a rounded rectangular shape, a circular shape, a semicircular shape, or a trapezoid shape. Optionally, the second solder joint <NUM> is in a rectangular shape, a rounded rectangular shape, a circular shape, a semicircular shape, or a trapezoid shape.

Specifically, in an example of <FIG>, the plurality of first solder joints <NUM> and the plurality of second solder joints <NUM> are all in the rounded rectangular shape. Further, a radius of a chamfer ranges from <NUM> to <NUM>. For example, the radius is <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, or <NUM>. Preferably, the radius of the chamfer is <NUM>.

It may be understood that, in other examples, the first solder joint <NUM> and the second solder joint <NUM> may also have different shapes. Some of the first solder joints <NUM> may have the same shape, but have different shapes from the remaining first solder joints <NUM>, or all of the first solder joints <NUM> may have different shapes. Some of the second solder joints <NUM> may have the same shape, but have different shapes from the remaining second solder joints <NUM>, or all of the second solder joints <NUM> may have different shapes.

Optionally, a length of the first solder joint <NUM> stretching from the body <NUM> ranges from <NUM> to <NUM>. For example, the length is <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, or <NUM>. A tolerance of the length of the first solder joint <NUM> stretching from the body <NUM> is ±<NUM>. Preferably, the length of the first solder joint <NUM> stretching from the body <NUM> is <NUM>.

Optionally, a width of the first solder joint <NUM> ranges from <NUM> to <NUM>. For example, the width is <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, or <NUM>. A tolerance of the width of the first solder joint <NUM> is ±<NUM>. Preferably, the width of the first solder joint <NUM> is <NUM>.

Optionally, a length of the second solder joint <NUM> stretching from the body <NUM> ranges from <NUM> to <NUM>. For example, the length is <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, or <NUM>. A tolerance of the length of the first solder joint <NUM> stretching from the body <NUM> is ±<NUM>. Preferably, the length of the first solder joint <NUM> stretching from the body <NUM> is <NUM>.

Optionally, a width of the second solder joint <NUM> ranges from <NUM> to <NUM>. For example, the width is <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, or <NUM>. A tolerance of the width of the second solder joint <NUM> is ±<NUM>. Preferably, the width of the first solder joint <NUM> is <NUM>.

Referring to <FIG> and <FIG>, optionally, the body <NUM> comprises a plurality of slits <NUM>. An end of each of the slits <NUM> forms an opening on the body <NUM>. In this way, since the body <NUM> is provided with the slits <NUM> and the end of the each slit <NUM> forms the opening on the body <NUM>, the deformation of the special-figure design ribbon <NUM> for connecting back contact cells may be absorbed by the slits <NUM>, so as to minimize the damage of the stress to the solar cells.

It may be understood that, when the special-figure design ribbon <NUM> for connecting back contact cells is subjected to the stress, the slits <NUM> are contracted or expanded, so that the expansion stress can be more effectively absorbed by means of the deformation of the slits <NUM>.

It may be understood that, the slit <NUM> is long and narrow, one end and another end of the slit <NUM> are two ends of the slit <NUM> in a length direction.

Specifically, in the examples of <FIG> and <FIG>, the slit <NUM> is in a rectangular shape. In this way, the slit <NUM> has a relatively regular form and is convenient to manufacture. It may be understood that, in other examples, the slit <NUM> may also be in an oval shape, a runway shape, or other irregular shapes.

Further, in a case that the slit <NUM> is in the rectangular shape and the length direction of the slit <NUM> coincides with the width direction of the body <NUM>, a length of the slit <NUM> is a dimension of the slit <NUM> in the width direction of the body <NUM>. A width of the slit <NUM> is a dimension of the slit <NUM> in the length direction of the body <NUM>.

Specifically, in the examples of <FIG> and <FIG>, a plurality of slits <NUM> are provided. Therefore, the capacity of the special-figure design ribbon <NUM> for connecting back contact cells for absorbing the expansion stress becomes stronger by using the plurality of slits <NUM>, thereby further reducing the damage of the stress to the solar cells. It may be understood that, in other embodiments, a quantity of the slits <NUM> may be one.

Specifically, in the examples of <FIG> and <FIG>, openings of the slits <NUM> are formed on two sides of the body <NUM> in the width direction. In this way, a deformation range of the body <NUM> may be expanded by means of the deformation of the slits <NUM> on the two sides in the width direction, so that the capacity of the special-figure design ribbon <NUM> for connecting back contact cells for absorbing the expansion stress becomes stronger, thereby further reducing the damage of the stress to the solar cells. It may be understood that, in other embodiments, the opening of the slit <NUM> may also be formed on only a first side of the body <NUM> in the width direction, or may be formed on one side or two sides of the body <NUM> in the length direction.

Referring to <FIG>, optionally, each first solder joint <NUM> corresponds to a set of slits <NUM>. A slit in the set of slits <NUM> at a larger distance from the corresponding first solder joint <NUM> in a length direction is at a larger distance from the corresponding first solder joint <NUM> in the width direction. Optionally, each second solder joint <NUM> corresponds to a set of slits <NUM>. A slit in the set of slits <NUM> at a larger distance from the corresponding second solder joint <NUM> in a length direction is at a larger distance from the corresponding second solder joint <NUM> in the width direction. In this way, a current can be more effectively transmitted by the special-figure design ribbon <NUM> for connecting back contact cells, and the special-figure design ribbon <NUM> for connecting back contact cells has a better effect of absorbing the stress.

Specifically, a quantity of the slits <NUM> in the set of slits <NUM> corresponding to the first solder joint <NUM> is <NUM>, and a quantity of the slits <NUM> in the set of slits <NUM> corresponding to the second solder joint <NUM> is <NUM>.

It may be understood that, in other embodiments, the quantity of the slits <NUM> in the set of slits <NUM> corresponding to the first solder joint <NUM> may alternatively be different from the quantity of the slits <NUM> in the set of slits <NUM> corresponding to the second solder joint <NUM>. The quantity of the slits <NUM> in the set of slits <NUM> corresponding to the first solder joint <NUM> may be <NUM>, <NUM>, <NUM>, <NUM>, or more. The quantity of the slits <NUM> in the set of slits <NUM> corresponding to the second solder joint <NUM> may be <NUM>, <NUM>, <NUM>, <NUM>, or more.

It may be understood that, in other embodiments, each first solder joint <NUM> may alternatively correspond to the set of slits <NUM>. A slit in the set of slits <NUM> at a larger distance from the corresponding first solder joint <NUM> in a length direction is at a smaller distance from the corresponding first solder joint <NUM> in the width direction. In other embodiments, each second solder joint <NUM> may alternatively correspond to the set of slits <NUM>. A slit in the set of slits <NUM> at a larger distance from the corresponding second solder joint <NUM> in a length direction is at a smaller distance from the corresponding second solder joint <NUM> in the width direction. In this way, a current may also be more effectively transmitted by the special-figure design ribbon <NUM> for connecting back contact cells, and the special-figure design ribbon <NUM> for connecting back contact cells has a better effect of absorbing the stress.

Referring to <FIG>, optionally, in a case that the quantity of the slits <NUM> in the set of slits <NUM> corresponding to the first solder joint <NUM> is an odd number, the set of slits <NUM> are symmetrical about a center line of the middle slit <NUM>. In this way, the symmetrical arrangement of the set of slits <NUM> is convenient for manufacturing, and the expansion stress can be more effectively absorbed by means of the deformation of the special-figure design ribbon <NUM> for connecting back contact cells.

It is to be noted that the center line of the slit <NUM> is a line that passes through a center of the slit <NUM> and is parallel to the width direction.

Further, the center line of the middle slit <NUM> coincides with the center line <NUM> of the corresponding first solder joint. In this way, the middle slit <NUM> is conveniently positioned according to the first solder joint <NUM>, or the first solder joint <NUM> is conveniently positioned according to the middle slit <NUM>, thereby facilitating enhancement of the production efficiency.

Similarly, in a case that the quantity of the slits <NUM> in the set of slits <NUM> corresponding to the second solder joint <NUM> is an odd number, the set of slits <NUM> are symmetrical about the center line of the middle slit <NUM>. In this way, the symmetrical arrangement of the set of slits <NUM> is convenient for manufacturing, and the expansion stress can be more effectively absorbed by means of the deformation of the special-figure design ribbon <NUM> for connecting back contact cells.

Further, the center line of the middle slit <NUM> coincides with the center line of the corresponding second solder joint <NUM>. In this way, the middle slit <NUM> is conveniently positioned according to the second solder joint <NUM>, or the second solder joint <NUM> is conveniently positioned according to the middle slit <NUM>, thereby facilitating enhancement of the production efficiency.

Referring to <FIG>, optionally, distances between the set of slits <NUM> corresponding to the first solder joint <NUM> and the corresponding first solder joint <NUM> may be equal in the width direction, or may be equal in the length direction. Therefore, this facilitates manufacturing and facilitates enhancement of the production efficiency.

Specifically, the quantity of the slits <NUM> in the set of slits <NUM> corresponding to the first solder joint <NUM> is <NUM>, and the two slits are symmetrical about the center line <NUM> of the first solder joint. In the set of slits <NUM> corresponding to the second solder joint <NUM>, the quantity of the slits <NUM> is <NUM>, and the two slits are symmetrical about a center line of the second solder joint <NUM>.

Referring to <FIG>, optionally, in a case that the quantity of the slits <NUM> in the set of slits <NUM> corresponding to the first solder joint <NUM> is an even number, the set of slits <NUM> are symmetrical about center lines of the two middle slits <NUM>. In this way, the symmetrical arrangement of the set of slits <NUM> is convenient for manufacturing, and the expansion stress can be more effectively absorbed by means of the deformation of the special-figure design ribbon <NUM> for connecting back contact cells.

It is to be noted that the center lines of the two middle slits <NUM> are lines that pass through centers of the two middle slits <NUM> and are parallel to the width direction.

Further, the center lines of the two middle slits <NUM> coincide with the center line <NUM> of the corresponding first solder joint. In this way, the two middle slits <NUM> are conveniently positioned according to the first solder joint <NUM>, or the first solder joint <NUM> is conveniently positioned according to the two middle slits <NUM>, thereby facilitating enhancement of the production efficiency.

Similarly, in a case that the quantity of the slits <NUM> in the set of slits <NUM> corresponding to the second solder joint <NUM> is an even number, the set of slits <NUM> are symmetrical about the center lines of the two middle slits <NUM>. In this way, the symmetrical arrangement of the set of slits <NUM> is convenient for manufacturing, and the expansion stress can be more effectively absorbed by means of the deformation of the special-figure design ribbon <NUM> for connecting back contact cells.

Further, the center lines of the two middle slits <NUM> coincide with the center line of the corresponding second solder joint <NUM>. In this way, the two middle slits <NUM> are conveniently positioned according to the second solder joint <NUM>, or the second solder joint <NUM> is conveniently positioned according to the two middle slits <NUM>, thereby facilitating enhancement of the production efficiency.

Referring to <FIG>, optionally, a set of slits <NUM> include a first slit <NUM>, a second slit <NUM>, a third slit <NUM>, a fourth slit <NUM>, and a fifth slit <NUM>. The first slit <NUM> is located in the middle of the set of slits <NUM>. The second slit <NUM> and the third slit <NUM> are respectively located on two sides of the first slit <NUM>. The fourth slit <NUM> is located on a side of the second slit <NUM> facing away from the first slit <NUM>. The fifth slit <NUM> is located on a side of the third slit <NUM> facing away from the first slit <NUM>. Lengths of the set of slits <NUM> satisfy the following relationship:
<MAT> where
L1 is a length of the first slit <NUM>, L2 is a length of the second slit <NUM>, L3 is a length of the third slit <NUM>, L4 is a length of the fourth slit <NUM>, and L5 is a length of the fifth slit <NUM>.

In this way, a slit in the five slits <NUM> at a larger distance from the corresponding solder joints in the length direction is at a larger distance from the corresponding solder joints in the width direction. In addition, the lengths of the five slits <NUM> are symmetrical about the first slit <NUM> in the middle, so that the expansion stress can be more effectively absorbed by means of the deformation of the special-figure design ribbon <NUM> for connecting back contact cells.

Referring to <FIG>, optionally; the length L1 of the first slit <NUM> ranges from <NUM> to <NUM>. For example, the length is <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, or <NUM>. Preferably, the length L1 of the first slit <NUM> is <NUM>.

Optionally, the length L2 of the second slit <NUM> ranges from <NUM> to <NUM>. For example, the length is <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, or <NUM>. Preferably, the length L2 of the second slit <NUM> is <NUM>.

Optionally, the length L3 of the third slit <NUM> ranges from <NUM> to <NUM>. For example, the length is <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, or <NUM>. Preferably, the length L3 of the third slit <NUM> is <NUM>.

Optionally, the length L4 of the fourth slit <NUM> ranges from <NUM> to <NUM>. For example, the length is <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, or <NUM>. Preferably, the length L4 of the fourth slit <NUM> is <NUM>.

Optionally, the length L5 of the fifth slit <NUM> ranges from <NUM> to <NUM>. For example, the length is <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, or <NUM>. Preferably, the length L5 of the fifth slit <NUM> is <NUM>.

Referring to <FIG>, optionally, the special-figure design ribbon <NUM> for connecting back contact cells connects a first cell to a second cell. The body <NUM> includes a first connecting portion <NUM> covering the first cell, a second connecting portion <NUM> covering the second cell, and a third connecting portion <NUM> covering a gap between the first cell and the second cell. Dimensions of the special-figure design ribbon <NUM> for connecting back contact cells satisfy the following relationship:
<MAT> where
d1 is a width of the first connecting portion <NUM>, L2 is the length of the second slit <NUM>, and L3 is the length of the third slit <NUM>.

In this way, the length(s) of the second slit <NUM> and/or the third slit <NUM> may equal the width of the first connecting portion <NUM>, so that a part of the body <NUM> in contact with the solar cells has stronger deformability and a stronger capability of absorbing the expansion stress, thereby further reducing the damage of the stress to the solar cells.

Referring to <FIG>, optionally, a distance between two adjacent slits <NUM> in the set of slits <NUM> satisfies the following relationship:
<MAT> where
L1 is the length of the first slit <NUM>, S1 is a distance between the first slit <NUM> and the second slit <NUM>, and S2 is a distance between the second slit <NUM> and the fourth slit <NUM>; and/or
<MAT> where
L1 is the length of the first slit <NUM>, S3 is a distance between the first slit <NUM> and the third slit <NUM>, and S4 is a distance between the third slit <NUM> and the fifth slit <NUM>.

In this way, the distance between two adjacent slits <NUM> in the set of slits <NUM> is related to the length of the first slit <NUM>, thereby more effectively absorbing the expansion stress and minimizing the damage of the stress to the solar cells.

Specifically, a value of L1: (S3+S4) is, for example, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, or <NUM>.

In an example of <FIG>, the value of L1: (S3+S4) is <NUM>. L1 is <NUM>, S3 is <NUM>, and S4 is <NUM>.

Referring to <FIG>, optionally, the width d1 of the first connecting portion <NUM> ranges from <NUM> to <NUM>. For example, the width is <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, or <NUM>. Preferably, the width d1 of the first connecting portion <NUM> is <NUM>.

Optionally, a width d2 of the second connecting portion <NUM> ranges from <NUM> to <NUM>. For example, the width is <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, or <NUM>. Preferably, the width d2 of the second connecting portion <NUM> is <NUM>.

Optionally, a width d3 of the third connecting portion <NUM> ranges from <NUM> to <NUM>. For example, the width is <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, or <NUM>. Preferably, the width d3 of the third connecting portion <NUM> is <NUM>.

Optionally, the special-figure design ribbon <NUM> for connecting back contact cells connects the first cell to the second cell. The first solder joint <NUM> is connected to a positive electrode of the first cell. The second solder joint <NUM> is connected to a negative electrode of the second cell. An area of the first solder joint <NUM> is greater than or equal to an area of the second solder joint <NUM>. Alternatively, the first solder joint <NUM> is connected to a negative electrode of the first cell. The second solder joint <NUM> is connected to a positive electrode of the second cell. The area of the second solder joint is greater than or equal to the area of the first solder joint.

It may be understood that, since a current of the positive electrode is larger than that of the negative electrode, the width of the connecting portion corresponding to the positive electrode may be larger, so that a structure of the ribbon can better match the current of the cell.

Specifically, the area of the first solder joint <NUM> is greater than or equal to the area of the second solder joint <NUM>. The first solder joint <NUM> and the second solder joint <NUM> may have the same width, and the length of the first solder joint <NUM> is greater than the length of the second solder joint <NUM>. Alternatively, the first solder joint <NUM> and the second solder joint <NUM> may have the same length, and the width of the first solder joint <NUM> is greater than the width of the second solder joint <NUM>. Alternatively, the length of the first solder joint <NUM> is greater than the length of the second solder joint <NUM>, and the width of the first solder joint <NUM> is greater than the width of the second solder joint <NUM>.

Referring to <FIG>, optionally, a plurality of slits <NUM> are provided, and directions in which the plurality of slits <NUM> stretch are all parallel to the width direction of the body <NUM>. In this way, more expansion stresses in the length direction of the body <NUM> can be absorbed, thereby reducing the damage of the stress to the solar cells. In addition, the directions in which the plurality of slits <NUM> stretch are parallel to each other, which is convenient for manufacturing and facilitates the enhancement of the production efficiency.

It may be understood that, in other embodiments, the directions in which all of the slits <NUM> stretch are all at an angle to the width direction of the body <NUM>. Directions in which some of the slits <NUM> stretch may be at an angle to the width direction of the body <NUM>, and the directions in which the rest of the slits <NUM> stretch are parallel to the width direction of the body <NUM>. Further, in a case that the directions in which the plurality of slits <NUM> stretch are at an angle to the width direction of the body <NUM>, the plurality of slits <NUM> may or may not be parallel to each other.

Referring to <FIG>, optionally, a width w1 of the slit <NUM> ranges from <NUM> to <NUM>. For example, the width is <NUM>, <NUM>, <NUM>, <NUM>, or <NUM>. In this way, the width w1 of the slit <NUM> is in an appropriate range, so as to avoid poor deformability of the special-figure design ribbon <NUM> for connecting back contact cells due to an excessively small width w1 of the slit <NUM>, and avoid a relatively poor strength of the special-figure design ribbon <NUM> for connecting back contact cells due to the excessively large width w1 of the slit <NUM>. A tolerance of the width w1 of the slit <NUM> may be ±<NUM>.

Preferably, the width w1 of the slit <NUM> is <NUM>. In this way, the deformability and the mechanical strength of the special-figure design ribbon <NUM> for connecting back contact cells can be all taken into consideration, thereby achieving an optimal overall effect.

Specifically, in the example of <FIG>, the width w1 of the slit <NUM> is a dimension of the slit <NUM> in the length direction of the body <NUM>.

Referring to <FIG>, optionally, a spacing between two adjacent slits <NUM> ranges from <NUM> to <NUM>. For example, the spacing is <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, or <NUM>. In this way, the spacing between the two adjacent slits <NUM> is in an appropriate range, so as to avoid a relatively poor mechanical strength of the special-figure design ribbon <NUM> for connecting back contact cells due to an excessively small spacing between the two adjacent slits <NUM>, and avoid relatively poor deformability of the special-figure design ribbon <NUM> for connecting back contact cells due to the excessively large spacing between the two adjacent slits <NUM>.

Specifically, the spacing between the two adjacent slits <NUM> is a distance between the center lines of the two adjacent slits <NUM>. In <FIG>, S1 is the distance between the first slit <NUM> and the second slit <NUM>, which is <NUM>. S2 is the distance between the second slit <NUM> and the fourth slit <NUM>, which is <NUM>. S3 is the distance between the first slit <NUM> and the third slit <NUM>, which is <NUM>. S4 is the distance between the third slit <NUM> and the fifth slit <NUM>, which is <NUM>. tolerance is ±<NUM>.

Specifically, in the set of slits <NUM>, the spacing between the two adjacent slits <NUM> may be the same or different. In a case that the spacings between the two adjacent slits <NUM> are the same, the spacing between the two adjacent slits <NUM> is a fixed value within a range of <NUM> to <NUM>. In a case that the spacing between the two adjacent slits <NUM> is different, the spacing between the two adjacent slits <NUM> is a plurality of values within the range of <NUM> to <NUM>.

Referring to <FIG>, optionally, a spacing D1 between two adjacent sets of the slits <NUM> ranges from <NUM> to <NUM>. For example, the spacing is <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, or <NUM>. In this way, the spacing D1 between the two adjacent sets of slits <NUM> is in an appropriate range, so as to avoid a relatively poor mechanical strength of the special-figure design ribbon <NUM> for connecting back contact cells due to an excessively small spacing D1 between the two adjacent sets of slits <NUM>, and avoid relatively poor deformability of the special-figure design ribbon <NUM> for connecting back contact cells due to the excessively large spacing D1 between the two adjacent sets of slits <NUM>. Preferably, the spacing D1 between two adjacent sets of slits <NUM> is <NUM>.

Specifically, the spacing between two adjacent sets of slits <NUM> is a distance between two slits <NUM> in two sets of slits <NUM> and closest to each other.

Referring to <FIG>, optionally, the body <NUM> is further provided with vias <NUM>. Another end of the slit <NUM> is in communication with each of the vias <NUM>. In this way, the deformation of the special-figure design ribbon <NUM> for connecting back contact cells can be absorbed through the vias <NUM>, thereby reducing the damage of the stress to the solar cells. In addition, the slits <NUM> are in communication with the vias <NUM>, thereby achieving a better effect of absorbing the deformation of the ribbon <NUM>.

Specifically, there may be one or more vias <NUM>. One via <NUM> may be in communication with one slit <NUM>, a plurality of slits <NUM> are in communication with one via <NUM>, or one slit <NUM> may in communication with a plurality of vias <NUM>. A specific manner in which the slit <NUM> is brought into communication with the via <NUM> is not limited herein.

Referring to <FIG>, the vias <NUM> corresponding to the second slit <NUM> and the third slit <NUM> are in an oval shape, and a length of a short axis of each via is greater than a width of the gap between the first cell and the second cell. The vias <NUM> corresponding to the second slit <NUM> and the third slit <NUM> are misaligned with the third connecting portion <NUM>.

Referring to <FIG>, optionally, a length of a long axis of the via <NUM> corresponding to the first slit <NUM> ranges from <NUM> to <NUM>. For example, the length of the long axis is <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, or <NUM>. Preferably, the length of the long axis of the via <NUM> corresponding to the first slit <NUM> is <NUM>.

Referring to <FIG>, optionally, a length of a short axis of the via <NUM> corresponding to the first slit <NUM> ranges from <NUM> to <NUM>. For example, the length of the short axis is <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, or <NUM>. Preferably, the length of the short axis of the via <NUM> corresponding to the first slit <NUM> is <NUM>.

Referring to <FIG>, optionally, the length of the long axis of the via <NUM> corresponding to the second slit <NUM> ranges from <NUM> to <NUM>. For example, the length of the long axis is <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, or <NUM>. Preferably, the length of the long axis of the via <NUM> corresponding to the second slit <NUM> is <NUM>.

Referring to <FIG>, optionally, the length of the short axis of a via <NUM> corresponding to the second slit <NUM> ranges from <NUM> to <NUM>. For example, the length of the short axis is <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, or <NUM>. Preferably, the length of the short axis of the via <NUM> corresponding to the second slit <NUM> is <NUM>.

Referring to <FIG>, optionally, the length of the long axis of the via <NUM> corresponding to the third slit <NUM> ranges from <NUM> to <NUM>. For example, the length of the long axis is <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, or <NUM>. Preferably, the length of the long axis of the via <NUM> corresponding to the third slit <NUM> is <NUM>.

Referring to <FIG>, optionally, the length of the short axis of the via <NUM> corresponding to the third slit <NUM> ranges from <NUM> to <NUM>. For example, the length of the short axis is <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, or <NUM>. Preferably, the length of the short axis of the via <NUM> corresponding to the third slit <NUM> is <NUM>.

Referring to <FIG>, optionally, the length of the long axis of the via <NUM> corresponding to the fourth slit <NUM> ranges from <NUM> to <NUM>. For example, the length of the long axis is <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, or <NUM>. Preferably, the length of the long axis of the via <NUM> corresponding to the fourth slit <NUM> is <NUM>.

Referring to <FIG>, optionally, the length of the short axis of the via <NUM> corresponding to the fourth slit <NUM> ranges from <NUM> to <NUM>. For example, the length of the short axis is <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, or <NUM>. Preferably, the length of the short axis of the via <NUM> corresponding to the fourth slit <NUM> is <NUM>.

Referring to <FIG>, optionally, the length of the long axis of the via <NUM> corresponding to the fifth slit <NUM> ranges from <NUM> to <NUM>. For example, the length of the long axis is <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, or <NUM>. Preferably, the length of the long axis of the via <NUM> corresponding to the fifth slit <NUM> is <NUM>.

Referring to <FIG>, optionally, the length of the short axis of the via <NUM> corresponding to the fifth slit <NUM> ranges from <NUM> to <NUM>. For example, the length of the short axis is <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, or <NUM>. Preferably, the length of the short axis of the via <NUM> corresponding to the fifth slit <NUM> is <NUM>.

Referring to <FIG>, optionally, four rounded corners are formed at a junction of the first slit <NUM> and the corresponding via <NUM>, and radii thereof are all <NUM>.

Referring to <FIG>, optionally, four rounded corners are formed at a junction of the second slit <NUM> and the corresponding via <NUM>, and radii thereof are all <NUM>.

Referring to <FIG>, optionally, four rounded corners are formed at a junction of the third slit <NUM> and the corresponding via <NUM>, and radii thereof are all <NUM>.

Referring to <FIG>, optionally, four rounded corners are formed at a junction of the fourth slit <NUM> and the corresponding via <NUM>, and radii thereof are all <NUM>.

Referring to <FIG>, optionally, four rounded corners are formed at a junction of the fifth slit <NUM> and the corresponding via <NUM>, and radii thereof are all <NUM>.

Referring to <FIG>, optionally, the first solder joint <NUM> is connected to the first cell. The second solder joint <NUM> is connected to the second cell. The via <NUM> is in an oval shape. The length of the short axis of the via <NUM> is the width of the gap between the first cell and the second cell. The long axis of the via <NUM> coincides with a center line <NUM> of the body <NUM>.

In this way, the short axis of the via <NUM> is caused to be sandwiched between the first cell and the second cell and to be parallel to the width direction of the body <NUM>. The long axis of the via <NUM> is parallel to the length direction of the body <NUM>. Therefore, the effect of absorbing the deformation of the special-figure design ribbon <NUM> for connecting back contact cells through the via <NUM> can be better, thereby further reducing the damage of the stress to the solar cells.

Specifically, the long axis of the via <NUM> coincides with a center line of the gap between the first cell and the second cell. In this way, the effect of absorbing the deformation of the ribbon <NUM> through the via <NUM> can be better, and the damage of the stress to the cells can be further minimized.

Specifically, in an example of <FIG>, in the vias <NUM> corresponding to the set of slits <NUM>, the vias <NUM> corresponding to the second slit <NUM> and the third slit <NUM> are in the oval shape, the length of the short axis is the width of the gap between the first cell and the second cell, and the long axis coincides with the center line <NUM> of the body <NUM>. In this way, the deformation of the special-figure design ribbon <NUM> for connecting back contact cells is absorbed at other positions of the body <NUM> through the vias <NUM> corresponding to the first slit <NUM>, the fourth slit <NUM>, and the fifth slit <NUM>, thereby achieving a better effect of absorbing deformation.

It may be understood that, in other examples, all of the vias <NUM> corresponding to the set of slits <NUM> may be in the oval shape, the lengths of the short axes are all the width of the gap between the first cell and the second cell, and the long axes coincide with the center line <NUM> of the body <NUM>.

It may be understood that, in other examples, the via <NUM> may be not only in the oval shape, but also in a circular shape, a semicircular shape, a rhombus shape, or other shapes. The shapes of the plurality of vias <NUM> may be the same or different, which are not limited herein.

Optionally, two adjacent vias <NUM> in a set of the vias <NUM> corresponding to each first solder joint <NUM> are staggered from each other in the length direction. In this way, the current can be more effectively transmitted, so as to more effectively absorb the deformation of the special-figure design ribbon <NUM> for connecting back contact cells.

It may be understood that, in other embodiments, the two adjacent vias <NUM> in the set of the vias <NUM> corresponding to each first solder joint <NUM> may partially or completely overlap in the length direction.

Referring to <FIG>, optionally, each first solder joint <NUM> corresponds to the set of vias <NUM>. An increase in distances between each of the vias and the corresponding first solder joint <NUM> in the length direction leads to a decrease in the long axes and the short axes of the set of the vias <NUM>. Optionally, each second solder joint <NUM> corresponds to the set of the vias <NUM>. An increase in distances between each of the vias and the corresponding second solder joint <NUM> in the length direction leads to a decrease in the long axes and the short axes of the set of the vias <NUM>. In this way, a current can be more effectively transmitted by the special-figure design ribbon <NUM> for connecting back contact cells, and the special-figure design ribbon <NUM> for connecting back contact cells has a better effect of absorbing the stress.

It may be understood that, in other embodiments, each first solder joint <NUM> may correspond to the set of vias <NUM>. An increase in distances between each of the vias and the corresponding first solder joint <NUM> in the length direction leads to an increase in the long axes and the short axes of the set of vias <NUM>. In other embodiments, each second solder joint <NUM> may correspond to the set of vias <NUM>. An increase in distances between each of the vias and the corresponding second solder joint <NUM> in the length direction leads to an increase in the long axes and the short axes of the set of vias <NUM>.

Referring to <FIG>, optionally, distances between two adjacent slits <NUM> in the set of slits <NUM> are the same.

It may be understood that, the distances between the two adjacent slits <NUM> in the set of slits <NUM> may be different, or may be partially the same, and partially different.

Claim 1:
A ribbon (<NUM>) for connecting back contact cells, the ribbon (<NUM>) comprising:
an elongated body (<NUM>); and
a plurality of first extensions (<NUM>) and a plurality of second extensions (<NUM>), respectively located on two longitudinal sides of the body (<NUM>) in a width direction, wherein each first extensions (<NUM>) is suitable to form a solder joint with one of the back contact cells and each second extensions (<NUM>) is suitable to form a solder joint with an adjacent back contact cell;
wherein
each of the plurality of first extensions (<NUM>) extends outward from a first longitudinal side of the body (<NUM>);
each of the plurality of second extensions (<NUM>) extends outward from a second longitudinal side of the body (<NUM>); and
the plurality of first extensions (<NUM>) and the plurality of second extensions (<NUM>) adjacent to each other are staggered from each other in a width direction of the body (<NUM>);
characterized in that:
the body (<NUM>) comprises a plurality of sets of slits (<NUM>), wherein:
an end of each slit (<NUM>) in each set of slits (<NUM>) forms an opening on a longitudinal side of the body (<NUM>), and each slit (<NUM>) extends in parallel to a width direction of the body;
the plurality of sets of slits (<NUM>) comprises a plurality of first set of slits (<NUM>) and a plurality of second set of slits (<NUM>);
each first set of slits (<NUM>) is disposed on the second side of the body (<NUM>) and opposite to one first extension (<NUM>), wherein the distance in a width direction between each slit (<NUM>) in the each first set of slits (<NUM>) and the one first extension (<NUM>) is increased as the distance in a length direction between the slit (<NUM>) in the each first set of slits (<NUM>) and the one first extension (<NUM>) is larger; and
each second set of slits (<NUM>) is disposed on the first side of the body (<NUM>) and opposite to one second extension (<NUM>), wherein the distance in a width direction between each slit (<NUM>) in the each second set of slits (<NUM>) and the one second extension (<NUM>) is increased as the distance in a length direction between the slit (<NUM>) in the each second set of slits (<NUM>) and the one second extension (<NUM>) is larger.