CN214505504U - Battery piece and photovoltaic module with same - Google Patents
Battery piece and photovoltaic module with same Download PDFInfo
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- CN214505504U CN214505504U CN202120467268.1U CN202120467268U CN214505504U CN 214505504 U CN214505504 U CN 214505504U CN 202120467268 U CN202120467268 U CN 202120467268U CN 214505504 U CN214505504 U CN 214505504U
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Abstract
The utility model discloses a battery piece and photovoltaic module who has it, the battery piece includes: a cell body; a plurality of main grid lines, a plurality of main grid lines include a plurality of front main grid lines, a plurality of front main grid lines are along first direction interval each other, and a plurality of front main grid lines set up the front at the battery piece body, every front main grid line includes a plurality of pads and a plurality of main grid line section, along with first direction vertically second direction, at least one in two pads in every front main grid line's the outside is first pad, the minimum distance between the side of first pad and the battery piece body that corresponds is D, wherein, D satisfies: d is more than or equal to 9mm and less than or equal to 16 mm; the plurality of secondary grid lines comprise a plurality of front secondary grid lines, and the plurality of front secondary grid lines are arranged on the front surface of the battery piece body at intervals along the second direction. According to the utility model discloses a battery piece can improve the structural strength of interconnected structure effectively, can reduce interconnected structure's loss simultaneously, reduces photovoltaic module's cost.
Description
Technical Field
The utility model belongs to the technical field of the photovoltaic and specifically relates to a battery piece and photovoltaic module who has it is related to.
Background
In the related art, in order to increase the output power of the photovoltaic module, the spacing between the cells is smaller and smaller. At present, sectional periodic welding strips are mostly adopted for welding among small-spacing battery pieces, namely circular welding strips or triangular welding strips are adopted for the front sides of the battery pieces, and flat welding strips are adopted for the back sides of the battery pieces. However, since the solder strips with a certain length are required to be reserved at the cells at the two ends of the cell string of the photovoltaic module for connecting the bus bars, the total length of the solder strips used by the cells at the two ends of the cell string exceeds the length of the solder strip in one cycle, which increases the loss of the solder strip and further increases the cost of the photovoltaic module.
SUMMERY OF THE UTILITY MODEL
The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, an object of the present invention is to provide a battery plate, which can effectively improve the structural strength of the interconnection structure member, such as a solder strip, and at the same time can reduce the loss of the interconnection structure member, such as a solder strip, and reduce the cost of the battery plate.
Another object of the present invention is to provide a photovoltaic module having the above battery piece.
According to the utility model discloses battery piece of first aspect embodiment includes: a cell body; the plurality of main grid lines comprise a plurality of front main grid lines, the front main grid lines are spaced from each other along a first direction, the front main grid lines are arranged on the front of the battery piece body, each front main grid line comprises a plurality of bonding pads and a plurality of main grid line segments, at least one of the two bonding pads on the outermost side of each front main grid line along a second direction perpendicular to the first direction is a first bonding pad, and the minimum distance between the first bonding pad and the corresponding side edge of the battery piece body is D, wherein D satisfies the following conditions: d is more than or equal to 9mm and less than or equal to 16 mm; the plurality of secondary grid lines comprise a plurality of front secondary grid lines, and the plurality of front secondary grid lines are arranged on the front surface of the battery piece body at intervals along the second direction.
According to the utility model discloses battery piece, satisfy through making minimum distance D between first pad and the side of the battery piece body that corresponds 9mm ≤ D ≤ 16mm, when the battery piece is applied to photovoltaic module, can improve the structural strength of interconnection structure for example welding the area effectively, improve the welding speed of interconnection structure, reduce the lobe of a leaf rate of battery piece, can reduce the loss of interconnection structure for example welding the area simultaneously, reduce photovoltaic module's cost.
According to some embodiments of the present invention, the number of the front side secondary grid lines between the side edges of the battery piece body along the second direction, the first bonding pad and the corresponding1Wherein, the N is1Satisfies the following conditions: n is not less than 71≤10。
According to some embodiments of the present invention, a plurality of the front side secondary grid lines adjacent to the side edge of the cell body along the second direction are separated into a plurality of secondary grid line segments spaced apart from each other by a plurality of the front side main grid lines; the plurality of main grid line segments comprise at least one first main grid line segment and at least two second main grid line segments, one side, adjacent to the side edge of the corresponding battery piece body, of the first bonding pad is connected with the first main grid line segment and the two second main grid line segments, the first main grid line segment and the two second main grid line segments extend along the second direction, the first main grid line segment is located between the two second main grid line segments, each second main grid line segment is connected with the end portions of the plurality of auxiliary grid line segments located on the corresponding side of the first main grid line segment, and the length of the first main grid line segment is smaller than that of each second main grid line segment.
According to some embodiments of the present invention, along the first direction, the end face of the free end of the first main grid line segment corresponds to the cell body the distance between the sides is L1Wherein, said L1Satisfies the following conditions: l is not less than 4mm1≤6mm。
According to some embodiments of the invention, the number of the front secondary grid lines spanned by the first main grid line segment is N2Wherein, the N is2Satisfy the requirement of：3≤N2≤5。
According to some embodiments of the invention, two of the second main gate line segments and the first main gate line segments are parallel to each other.
According to some embodiments of the present invention, the battery piece is a complete battery piece, the battery piece body includes a scribing region, the scribing region extends along the first direction; the bonding pad closest to the scribing region in the bonding pads of each front main grid line is a second bonding pad, and the minimum distance between the second bonding pad and the central line of the scribing region in the second direction is d, wherein d satisfies: d is less than D.
According to some embodiments of the invention, the D, d further satisfies: D-D is more than or equal to 3mm and less than or equal to 6 mm.
According to the utility model discloses a some embodiments, the battery piece is complete battery piece, the battery piece body includes the scribing district, the scribing district is followed the first direction extends, do not set up in the scribing district the main grid line with vice grid line.
According to some embodiments of the present invention, further comprising: the auxiliary grid lines are arranged on the front face of the battery piece body at intervals along the first direction and located between two adjacent front face main grid lines, and the maximum width of each auxiliary grid line in the first direction is smaller than that of each front face main grid line in the first direction.
According to some embodiments of the invention, each of the auxiliary grid lines has a maximum width D in the first direction1Wherein, the D is1Satisfies the following conditions: d is more than or equal to 20 mu m1≤40μm。
According to the utility model discloses a some embodiments, every supplementary grid line includes the edge a plurality of supplementary grid line sections that the second direction interval set up, every supplementary grid line section is connected two between the positive vice grid line on the second direction, arbitrary adjacent two the interval has at least two between the supplementary grid line section the positive vice grid line.
According to some embodiments of the present invention, the plurality of main grid lines include a plurality of back main grid lines, the plurality of back main grid lines are disposed on the back of the battery piece body along the first direction at intervals, and each back main grid line includes a plurality of hollow connecting portions; the plurality of secondary grid lines comprise a plurality of back secondary grid lines, and the plurality of back secondary grid lines are arranged on the back of the battery piece body at intervals along the second direction.
According to some embodiments of the utility model, the material of front main grid line with the material of front fly line is the same, the material of back main grid line with the material of back fly line is the same, the material of front main grid line with the material of back main grid line is different.
According to some embodiments of the invention, each of the connection portions is of a rectangular frame structure, each of the connection portions having a hollow opening; the back of battery piece body is connected with a plurality of back electrodes, and is a plurality of back electrode is with a plurality of connecting portion one-to-one is connected, every back electrode is located the correspondence the opening part, every back electrode is in orthographic projection area on the back of battery piece body is less than the correspondence the hollow opening of connecting portion is in orthographic projection area on the back of battery piece body.
According to some embodiments of the invention, the material of the back electrode is different from the material of the back busbar.
According to some embodiments of the present invention, each of the back electrodes is a rectangular sheet, and each of the back electrodes has at least one groove formed on at least one side wall thereof, and at least one portion of the groove is opposite to the opening.
According to some embodiments of the invention, a length of each of the back electrodes in the second direction is less than a length of the corresponding connecting portion in the second direction; the width of each back electrode in the first direction is smaller than that of the corresponding connecting part in the first direction, and the width of each back electrode in the first direction is larger than that of the corresponding opening in the first direction.
According to some embodiments of the invention, each of the back electrodes is a silver paste sheet.
According to some embodiments of the present invention, the length of the battery piece body is L2Wherein, said L2Satisfies the following conditions: l is not less than 200mm2≤240mm。
According to some embodiments of the invention, the L2Further satisfies the following conditions: l is2＝210mm。
According to the utility model discloses photovoltaic module of second aspect embodiment, include according to the utility model discloses above-mentioned battery piece of first aspect embodiment.
According to some embodiments of the present invention, the photovoltaic module further comprises: the special-shaped welding strips comprise flat section welding strip sections and non-flat section welding strip sections which are connected with each other, the non-flat section welding strip sections are connected to the front face of the battery piece, and the flat section welding strip sections are connected to the back face of the battery piece.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic view of a front side of a battery piece according to an embodiment of the invention;
FIG. 2 is an enlarged view of portion A circled in FIG. 1;
FIG. 3 is an enlarged view of portion B circled in FIG. 1;
fig. 4 is a schematic view of the back side of a cell sheet according to an embodiment of the present invention;
fig. 5 is another schematic view of the back side of a cell sheet according to an embodiment of the invention, wherein the back electrode is not shown;
fig. 6 is an illustration of a back electrode of a battery cell according to an embodiment of the present invention;
FIG. 7 is an enlarged view of the circled portion C of FIG. 6;
fig. 8 is a schematic view of the front side of a battery piece according to another embodiment of the present invention;
fig. 9 is another schematic view of the back side of a cell sheet according to another embodiment of the present invention, wherein the back electrode is not shown.
Reference numerals:
100: a battery piece;
1: a cell body; 11: a scribing area; 12: a centerline;
2: a main gate line; 21: a front side main gate line; 211: a pad; 2111: a first pad;
2112: a second pad; 212: a main gate line segment; 213: a first main gate line segment;
214: a second main gate line segment; 215: a main gate portion; 22: a back side main grid line;
221: a connecting portion; 2211: an opening; 23: an auxiliary gate line;
231: an auxiliary gate line segment; 3: a secondary gate line; 31: a front side secondary grid line;
311: a secondary gate line segment; 312: a first front side secondary gate line; 32: a back side secondary grid line;
4: a back electrode; 41: and (4) a groove.
Detailed Description
A battery sheet 100 according to an embodiment of the first aspect of the present invention is described below with reference to fig. 1 to 9. The cell sheet 100 can be applied to a photovoltaic module (not shown). In the following description of the present application, the application of the cell sheet 100 to a photovoltaic module is taken as an example for illustration.
As shown in fig. 1 to 9, a battery sheet 100 according to an embodiment of the present invention includes a battery sheet body 1, a plurality of main grid lines 2, and a plurality of sub-grid lines 3. In the description of the present invention, "a plurality" means two or more.
Specifically, the plurality of main grid lines 2 include a plurality of front main grid lines 21, the plurality of front main grid lines 21 are spaced from each other along the first direction, and the plurality of front main grid lines 21 are disposed on the front surface of the battery cell body 1. The plurality of secondary grid lines 3 comprise a plurality of front secondary grid lines 31, and the plurality of front secondary grid lines 31 are arranged on the front surface of the battery piece body 1 at intervals along a second direction perpendicular to the first direction. The front surface of the cell body 1 refers to the main light receiving surface of the cell body 1; the "back surface" is a surface opposite to the front surface of the cell body 1. The "first direction" may be an extending direction of the front side finger lines 31, and the "second direction" may be an extending direction of the front side finger lines 21.
For example, in the example of fig. 1, the battery sheet 100 is generally rectangular. The plurality of front main gate lines 21 may each extend in a second direction (e.g., up and down direction in fig. 1) and be disposed at uniform intervals in a first direction (e.g., left and right direction in fig. 1), and the plurality of front sub gate lines 31 may each extend in the first direction and be disposed at uniform intervals in the second direction. The plurality of front main grid lines 21 may be parallel to each other, the plurality of front main grid lines 21 are parallel to the left side and the right side of the battery cell body 1, and the plurality of front sub-grid lines 31 may be perpendicular to the plurality of front main grid lines 21. Therefore, by arranging the plurality of main grid lines 2 and the plurality of auxiliary grid lines 3, when the battery piece 100 is applied to a photovoltaic module, the plurality of auxiliary grid lines 3 can guide out the current generated by the battery piece body 1 through the photovoltaic effect, and the plurality of main grid lines 2 can collect and gather the current guided by the plurality of auxiliary grid lines 3.
Referring to fig. 1, each front main gate line 21 includes a plurality of pads 211 and a plurality of main gate line segments 212, and each pad 211 is connected between adjacent two main gate line segments 212. Therefore, when the interconnection structure, such as a solder ribbon, is soldered to the front side busbar 21, since the interconnection structure, such as a solder ribbon, generally includes a solder layer, the plurality of solder pads 211 can effectively collect tin in the liquid solder layer, so that a soldering pull between the interconnection structure and the cell 100 can be increased, the connection between the interconnection structure and the cell 100 can be firmer, and the reliability of the photovoltaic module can be improved.
Referring to fig. 1 in combination with fig. 2, along the second direction, at least one of the two outermost pads 211 of each front side busbar line 21 is a first pad 2111, and a minimum distance between the first pad 2111 and a side edge of the corresponding cell body 1 is D, where D satisfies: d is more than or equal to 9mm and less than or equal to 16 mm. Wherein, any one of the two outermost pads 211 of each front bus bar 21 in the second direction may be the first pad 2111; alternatively, the two outermost pads 211 of each front bus bar 21 in the second direction may be the first pads 2111. Therefore, by making D satisfy 9mm ≦ D ≦ 16mm, when the cell 100 is applied to a photovoltaic module, compared with a conventional cell, since the first pad 2111 may be located closer to the center of the cell body 1, when an interconnection structure, such as a solder ribbon, is soldered, a solder starting point of the interconnection structure may be located closer to the center of the cell body 1, and two adjacent cells 100 of a cell string of the photovoltaic module are connected by a cycle of the interconnection structure, such as a solder ribbon, thereby effectively reducing the stretching length of the cycle of the interconnection structure, such as a solder ribbon, improving the structural strength of the interconnection structure, increasing the soldering speed of the interconnection structure, and reducing the splitting rate of the cells 100, and simultaneously reducing the total length of the interconnection structure, such as a solder ribbon, used by the cells 100 at two ends of the cell string of the photovoltaic module, so that the total length of the interconnection structure, such as a solder ribbon, used by the cells 100 at two ends of the cell string may be maintained as much as possible The length range of the periodic interconnection structural member can reduce the loss of the interconnection structural member, and further reduce the cost of the photovoltaic module.
According to the utility model discloses cell 100, satisfy 9mm through making minimum distance D between first pad 2111 and the side of the cell body 1 that corresponds and be less than or equal to D and be less than or equal to 16mm, when cell 100 is applied to photovoltaic module, can improve the structural strength of interconnection structure spare for example welding the area effectively, improve interconnection structure spare's welding speed, reduce cell 100's lobe of a leaf rate, can reduce the loss of interconnection structure spare for example welding the area simultaneously, reduce photovoltaic module's cost.
According to some embodiments of the present invention, the number of front side finger lines 31 between the second direction, the first pad 2111 and the corresponding side edge of the battery cell body 1 is N1Wherein N is1Satisfies the following conditions: n is not less than 71Less than or equal to 10. For example, in the example of fig. 1, the first pads 2111 are adjacent to first pads of the cell body 1Nine front side finger lines 31 are provided between the sides of the pad 2111, and the first pad 2111 may be located on the tenth front side finger line 31 adjacent to the above sides. When N is present1When the distance between the first welding pad 2111 and the side edge of the cell body 1 is larger than 10, the welding tension between the interconnection structural member such as a welding strip and the cell 100 may be affected; when N is present1If the distance between the first pad 2111 and the side edge is smaller than 7, on one hand, the total length of the interconnection structural member, such as a solder ribbon, used for the battery pieces 100 at the two ends of the battery string may exceed the length of the interconnection structural member for one cycle, so that the loss of the interconnection structural member, such as a solder ribbon, may increase; on the other hand, the degree of tin accumulation is high during soldering, and the solder is condensed around the first land 2111 to form a tin package, so that the battery sheet 100 is likely to be cracked. Thus, when N is1Satisfies the condition that N is more than or equal to 71Less than or equal to 10, the welding tension between the interconnection structural member such as the welding strip and the battery piece 100 can be effectively ensured, meanwhile, the loss of the interconnection structural member such as the welding strip can be reduced, and the battery piece 100 is not easy to crack.
According to some embodiments of the present invention, referring to fig. 1 in combination with fig. 2, the plurality of front side sub-grid lines 31 adjacent to the side of the cell body 1 along the second direction are separated into a plurality of sub-grid line segments 311 spaced apart from each other by the plurality of front side main grid lines 21. The plurality of sub-gate line segments 311 of each front side sub-gate line 31 are spaced apart from each other in the first direction. The plurality of main grid line segments 212 comprise at least one first main grid line segment 213 and at least two second main grid line segments 214, one side of the first bonding pad 2111, which is adjacent to the side edge of the corresponding cell body 1, is connected with the first main grid line segment 213 and the two second main grid line segments 214, the first main grid line segment 213 and the two second main grid line segments 214 both extend along the second direction, the first main grid line segment 213 is located between the two second main grid line segments 214, each second main grid line segment 214 is connected with the end portions of the plurality of sub-grid line segments 311 located on the corresponding side of the first main grid line segment 213, and the length of the first main grid line segment 213 is smaller than that of each second main grid line segment 214.
For example, in the example of fig. 1 and 2, the plurality of main grid lines 2 may include twelve front main grid lines 21, and nine front sub-grid lines 31 adjacent to the side of the cell body 1 are divided by the twelve front main grid lines 21 into thirteen sub-grid line segments 311 spaced apart from each other. Two main grid line segments 212 of the plurality of main grid line segments 212, which are adjacent to the side edge of the battery piece body 1 and the central axis of the battery piece body 1, are first main grid line segment groups, each of the first main grid line segment groups comprises a first main grid line segment 213 and two second main grid line segments 214, and the two second main grid line segments can collect and collect currents guided by the plurality of auxiliary grid line segments 311 on two sides of the first main grid line segment. In addition, since the interconnection structure member, such as a solder strip, can be soldered between the two second main grid line segments 214, by setting the length of the first main grid line segment 213 to be smaller than the length of each second main grid line segment 214, the free end of the first main grid line segment 213 is spaced from the side edge of the cell body 1, so that tin is prevented from gathering at the edge of the cell 100 when the interconnection structure member is soldered, the cell 100 is not prone to cracking, and the soldering strength of the interconnection structure member can be ensured.
Alternatively, as shown in fig. 2, the distance between the end surface of the free end of the first main grid line segment 213 and the corresponding side edge of the cell body 1 along the first direction is L1Wherein L is1Satisfies the following conditions: l is not less than 4mm1Less than or equal to 6 mm. Thus, when L is1L is less than or equal to 4mm1When less than or equal to 6mm, the value of the distance between the terminal surface of the free end of first main grid line section 213 and the side of the battery piece body 1 that corresponds is more reasonable, and when welding interconnection structure spare for example welded the area, the difficult tin package that forms in first main grid line 213 department can avoid battery piece 100 to take place the lobe of a leaf.
In some alternative embodiments, the number of front side subgrids 31 crossed by the first main gate line segment 213 is N2Wherein N is2Satisfies the following conditions: n is not less than 32Less than or equal to 5. For example, in the example of fig. 2, the number of front side finger lines 31 crossed by the first main gate line segment 213 is five. With such an arrangement, tin packets can be prevented from being formed at the first main gate line segment 213 during soldering, so that the soldering strength of the interconnection structure can be further ensured.
In some alternative embodiments, referring to fig. 2, the two second main gate line segments 214 and the first main gate line segment 213 are parallel to each other. Therefore, the processing of the main grid line 2 is facilitated, and the assembly efficiency of the battery piece 100 can be improved.
According to the utility model discloses a further embodiment, battery piece 100 is complete battery piece, and battery piece body 1 includes scribing region 11. For example, in the example of fig. 1, 3, 4 and 5, each front side main grid line 21 includes two main grid portions 215 arranged at intervals along the first direction, each main grid portion 215 includes eight pads 211 and nine main grid line segments 212, each pad 211 is located between two adjacent main grid line segments 212, two front side sub-grid lines 31 adjacent to the central axis of the cell body 1 in the plurality of front side sub-grid lines 31 are first front side sub-grid lines 312, an end portion of each main grid portion 215 adjacent to the central axis of the cell body 1 is connected to the corresponding first sub-grid line 312, a scribe area 11 may be defined between the two first sub-grid lines 312, and an operator may divide one complete cell 100 into two sub-pieces through the scribe area 11.
The scribe region 11 extends along the first direction, a pad 211 closest to the scribe region 11 among the pads 211 of each front bus bar line 21 is a second pad 2112, and a minimum distance between the second pad 2112 and a center line 12 of the scribe region 11 in the second direction is d, where d satisfies: d is less than D. With such an arrangement, when D satisfies D < D, the minimum distance between the second pad 2112 and the central line 12 of the scribe region 11 in the second direction is reasonable, the minimum distance between the first pad 2111 and the corresponding side edge of the cell body 1 is large, and when the cell 100 is applied to a photovoltaic module, the length of an interconnection structural member such as a solder ribbon can be shortened, so that the loss of the interconnection structural member can be reduced, and meanwhile, the welding tension of the interconnection structural member such as the solder ribbon at the second pad 2112 can be ensured. Wherein, when one complete battery piece 100 is divided into two pieces, d represents the minimum distance between the second pad 2112 and the diced end face of the piece.
Eight pads 211 and nine main gate line segments 212 are shown in fig. 1 for illustrative purposes, but it is obvious to those skilled in the art after reading the technical solution of the present application that the solution can be applied to other numbers of pads 211 and main gate line segments 212, which also falls within the protection scope of the present invention.
Optionally, D, d may further satisfy: D-D is more than or equal to 3mm and less than or equal to 6 mm. When D-D < 3mm, the total length of the interconnection structure such as solder ribbon used for the cell pieces 100 at both ends of the cell string of the photovoltaic module may exceed the length of one cycle of the interconnection structure such as solder ribbon, thereby possibly increasing the loss of the interconnection structure; when D-D > 6mm, the distance between the first land 2111 and the side edge of the corresponding cell body 1 is large, and the welding tension of the interconnection structural member such as a solder ribbon may be affected. According to the arrangement, when D, D satisfies that D-D is less than or equal to 3mm and less than or equal to 6mm, the total length of the interconnection structural members such as solder strips used by the battery pieces 100 at the two ends of the battery string can be within the length range of one cycle of the interconnection structural members such as solder strips, and the cycle length of the interconnection structural members such as solder strips can be reduced by 3mm to 6mm, at the moment, the length of the interconnection structural members such as solder strips can be substantially shortened by 2% to 3%, so that the structural strength of the interconnection structural members can be effectively improved, the loss of the interconnection structural members can be reduced, and the cost of the interconnection structural members can be reduced by about 2% to 3%.
According to some embodiments of the present invention, the main gate line 2 and the sub-gate line 3 are not disposed in the scribe region 11. Referring to fig. 1, 3 and 4, the middle of the cell body 1 is provided with a scribing region 11, and the main grid lines 2 and the sub-grid lines 3 are not arranged on the front and back of the cell body 1 corresponding to the scribing region 11. Therefore, when a complete battery piece 100 is divided into two independent pieces, the main grid lines 2 and the secondary grid lines 3 can be prevented from being scratched in the process of dividing the battery piece 100, so that a nondestructive scribing process can be matched, the scribing quality and the scribing speed of the battery piece 100 are effectively improved, the hidden crack risk of the battery piece 100 is reduced, and the load performance of a photovoltaic module can be improved.
According to the present invention, referring to fig. 4 and 5, the battery piece 100 further includes a plurality of auxiliary grid lines 23, the plurality of auxiliary grid lines 23 are spaced apart from each other along the first direction and are disposed on the front surface of the battery piece body 1, and the auxiliary grid lines 23 are disposed between two adjacent front main grid lines 21. Therefore, when the portion of the front side sub-grid line 31 between two adjacent front side main grid lines 21 is damaged, the current generated by the remaining portion of the front side sub-grid line 31 except the damaged portion can flow to another front side sub-grid line 31 adjacent to the front side sub-grid line through the sub-grid line 23, and finally the current is collected to the front side main grid line 21 through the adjacent front side sub-grid line 31. The maximum width of each auxiliary grid line 23 in the first direction is smaller than the maximum width of each front main grid line 21 in the first direction, so that the shielding of the auxiliary grid lines 23 on the front of the cell body 1 can be reduced, the light receiving area of the front of the cell body 1 is ensured, and the photoelectric conversion efficiency of the cell 100 can be effectively ensured.
Optionally, the maximum width of each auxiliary gate line 23 in the first direction is D1Wherein D is1Satisfies the following conditions: d is more than or equal to 20 mu m1Less than or equal to 40 mu m. When D is present1When the width of each auxiliary grid line 23 in the first direction is larger than 40 μm, the shielding area on the front surface of the cell body 1 may be increased, and the photoelectric conversion efficiency of the cell 100 may be affected; when D is present1If the width of each auxiliary grid line 23 in the first direction is smaller than 20 μm, the connection between the auxiliary grid line 23 and the front side grid sub-line 31 may be in poor contact, so that the current on the front side grid sub-line 31 cannot be smoothly collected onto the auxiliary grid line 23, which also affects the photoelectric conversion efficiency of the cell 100. Thus, when D1D is less than or equal to 20 mu m1When the thickness of the auxiliary grid line is less than or equal to 40 μm, the current on the front side auxiliary grid line 31 can be smoothly collected on the auxiliary grid line 23, and meanwhile, the shielding on the front side of the cell body 1 can be reduced, so that the photoelectric conversion efficiency of the cell 100 is ensured.
In some specific embodiments, each auxiliary gate line 23 includes a plurality of auxiliary gate line segments 231 spaced along the second direction, each auxiliary gate line segment 231 is connected between two front side sub-gate lines 31, and at least two front side sub-gate lines 31 are spaced between any two adjacent auxiliary gate line segments 231 in the second direction. For example, two front side finger lines 31 (shown in fig. 1) may be spaced between any two adjacent finger line segments 231; alternatively, three or more front sub-gate lines 31 may be spaced between any two adjacent sub-gate line segments 231. When the portions of one front side finger 31 located at both sides of the auxiliary finger segment 231 are damaged, the current generated at the portion of the front side finger 31 between two damaged positions can flow to another front side finger 31 adjacent thereto through the auxiliary finger segment 231, and finally the current is collected to the front side main finger 21 through the adjacent front side finger 31. Therefore, the current on the front side secondary grid line 31 can be effectively ensured to flow to the front side main grid line 21 as much as possible, so that the efficiency of the battery piece 100 can be improved, and the output power of the battery piece 100 can be ensured. In addition, two front side secondary grid lines 31 are arranged between two adjacent auxiliary grid line segments 231 at intervals, so that each front side secondary grid line 31 is connected with one auxiliary grid line segment 231, and the resistance of the battery piece 100 can be effectively reduced while current at each position on the front side secondary grid line 31 can flow to the main grid line 2.
Further, as shown in fig. 4 and 5, the plurality of bus bars 2 includes a plurality of back bus bars 22, the plurality of back bus bars 22 are disposed on the back of the battery sheet body 1 at intervals along the first direction, each back bus bar 22 includes a plurality of hollow connecting portions 221, which can effectively reduce the material consumption of the back bus bars 22, thereby further reducing the cost of the battery sheet 100. The plurality of connecting parts 221 are spaced from each other along the second direction, and each back main grid line 22 is connected with the back of the cell body 1 through the plurality of connecting parts 221 so as to lead out the electric energy generated by the cell body 1. The plurality of finger lines 3 include a plurality of back finger lines 32, and the plurality of back finger lines 32 are spaced apart from each other along the second direction and are disposed on the back surface of the battery cell body 1. The plurality of back side sub-gate lines 32 may be perpendicular to the plurality of back side main gate lines 22, the plurality of back side sub-gate lines 32 may guide out a current generated by the cell body 1 through a photovoltaic effect, and the plurality of back side main gate lines 22 may collect and collect the current guided by the plurality of back side sub-gate lines 32.
Alternatively, the battery sheet 100 may be used for a dual glass assembly. When the photovoltaic module is a double-glass module, the front side of the photovoltaic module can receive direct light of the sun for power generation, and the back side of the photovoltaic module can absorb reflected light and scattered light around for power generation, so that the photoelectric conversion efficiency of the photovoltaic module can be effectively improved. Of course, the battery sheet 100 may also be used for a single glass assembly.
In some alternative embodiments, the material of the front main gate line 21 is the same as that of the front sub-gate line 31, the material of the back main gate line 22 is the same as that of the back sub-gate line 32, and the material of the front main gate line 21 is different from that of the back main gate line 22. For example, since the front surface of the battery piece body 1 is a main light-receiving surface, the material of the front main grid line 21 and the material of the front sub-grid line 31 may both be silver paste, and the silver paste has a good conductive effect, so that the output power of the battery piece 100 can be effectively ensured. The back surface of the cell body 1 is a secondary light-receiving surface, the material of the back main grid line 22 and the material of the back auxiliary grid line 32 can be both aluminum paste, the cost of the aluminum paste is low, and the cost of the cell 100 can be reduced while the output power of the cell 100 is ensured.
In some alternative embodiments, as shown in fig. 4 and 5, each connection part 221 has a rectangular frame structure, each connection part 221 has a hollow opening 2211, a plurality of back electrodes 4 are connected to the back surface of the cell body 1, the plurality of back electrodes 4 are connected to the plurality of connection parts 221 in a one-to-one correspondence, and each back electrode 4 is located at the corresponding opening 2211, so that when the cell 100 is applied to a photovoltaic module, an interconnection structure, such as a solder strip, can be soldered to the back surface of the cell body 1 through the plurality of back electrodes 4, thereby ensuring the connection reliability of the interconnection structure to the back surface of the cell body 1. The front projection area of each back electrode 4 on the back surface of the cell body 1 is smaller than the front projection area of the hollow opening 2211 of the corresponding connecting portion 221 on the back surface of the cell body 1. Therefore, while the welding strength of the interconnection structural member such as a welding strip on the back surface of the cell body 1 is ensured, the back electrode 4 can be designed to be smaller, so that the material consumption of the back electrode 4 can be saved, and the cost of the cell 100 can be further reduced.
Alternatively, the material of the back electrode 4 is different from that of the back bus bar 22. For example, the material of the back main grid line 22 may be aluminum paste, and since the cost of the aluminum paste is low, the cost of the battery piece 100 may be effectively reduced while the output power of the battery piece 100 is ensured. Each back electrode 4 can be a silver paste sheet, and because the welding effect of silver paste sheet and tin is better, when the interconnection structure spare such as solder strip passes through back electrode 4 and welds the back at cell body 1, the connection that the silver paste sheet can make interconnection structure spare such as solder strip and cell body 1's back is more firm. Thus, by setting the material of the back electrode 4 and the material of the back main grid line 22 to be different, not only can the connection reliability of the interconnection structural member, such as a solder ribbon, and the back surface of the cell body 1 be ensured, but also the cost of the cell 100 can be reduced.
In some alternative embodiments, each back electrode 4 is a rectangular sheet, at least one groove 41 is formed on at least one sidewall of each back electrode 4, and at least a portion of the groove 41 is opposite to the opening 2211. For example, in the example of fig. 6 and 7, three grooves 41 are formed on both sides in the width direction of each back electrode 4, and the grooves 41 on both sides in the width direction of each back electrode 4 are symmetrical with respect to the center plane in the width direction of the back electrode 4, and the shape of each groove 41 is substantially rectangular. Thus, while ensuring reliable connection, the amount of material used for the back electrode 4 can be further reduced, and the cost of the battery cell 100 can be further reduced.
In some alternative embodiments, the length of each back electrode 4 in the second direction is less than the length of the corresponding connection portion 221 in the second direction, the width of each back electrode 4 in the first direction is less than the width of the corresponding connection portion 221 in the first direction, and the width of each back electrode 4 in the first direction is greater than the width of the corresponding opening 2211 in the first direction. Referring to fig. 4, the width of each back electrode 4 in the first direction is between the maximum width of the corresponding connection portion 221 in the first direction and the width of the corresponding opening 2211 in the first direction. With such an arrangement, while the back electrode 4 is effectively connected to the connection portion 221, the size of the back electrode 4 can be reduced, and the material consumption of the back electrode 4 can be further reduced.
According to some embodiments of the present invention, the length of the battery piece body 1 is L2Wherein L is2Satisfies the following conditions: l is not less than 200mm2Less than or equal to 240 mm. For example, L2Can further satisfy: l is2210 mm. Therefore, the length of the cell body 1 is large, so that the number of the cells 100 in the photovoltaic module can be correspondingly reduced, the effective light-emitting area of the photovoltaic module is increased, and the photovoltaic module can be further increasedThe conversion efficiency and the output power effectively reduce the cost of a single watt.
Alternatively, the cell body 1 may be a complete cell (as shown in fig. 1). Of course, the battery piece body 1 may also be cut from a part of a complete battery piece, for example, in the examples of fig. 8 and 9, the battery piece body 1 may be one half of the complete battery piece.
According to the utility model discloses photovoltaic module of second aspect embodiment, include according to the utility model discloses above-mentioned battery piece 100 of first aspect embodiment.
According to the utility model discloses photovoltaic module, through adopting foretell battery piece 100, can effectively improve photovoltaic module's output, reduces photovoltaic module's cost simultaneously.
According to some embodiments of the utility model, photovoltaic module still includes a plurality of dysmorphism solder strips (not shown), and every dysmorphism solder strip includes the flat section solder strip section and the non-flat section solder strip section that link to each other, and the front at battery piece 100 is connected to the non-flat section solder strip section, and the back at battery piece 100 is connected to the flat section solder strip section. Because the position of the first pad 2111 of the battery piece 100 is closer to the center of the battery piece 100 than the position of the first pad of the traditional battery piece, the welding starting point of the special-shaped welding strip can be closer to the center of the battery piece 100, the stretching length of the non-flat section welding strip of the special-shaped welding strip can be effectively reduced, and the structural strength of the special-shaped welding strip can be improved.
Optionally, the cross-sectional shape of the flat-section solder ribbon section is rectangular, so that the flat-section solder ribbon section is relatively flat, has relatively small thickness and relatively good welding performance, and can realize continuous welding with the battery piece 100. The cross section of the non-flat welding strip section is triangular or circular. For example, when the cross-sectional shape of the non-flat-section solder strip section is circular, continuous welding with the battery piece 100 can be realized, the series resistance can be reduced, and the risk of subfissure of the battery piece 100 can be reduced; when the cross section of the welding strip section of the non-flat section is triangular, the welding strip section of the non-flat section has a good reflection effect, and the conversion efficiency can be improved.
Other constructions and operations of photovoltaic modules according to embodiments of the present invention are known to those of ordinary skill in the art and will not be described in detail herein.
In the description of the present invention, it is to be understood that the terms "center", "length", "width", "thickness", "upper", "lower", "left", "right", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example.
While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (23)
1. A battery cell, comprising:
a cell body;
the plurality of main grid lines comprise a plurality of front main grid lines, the front main grid lines are spaced from each other along a first direction, the front main grid lines are arranged on the front of the battery piece body, each front main grid line comprises a plurality of bonding pads and a plurality of main grid line segments, at least one of the two bonding pads on the outermost side of each front main grid line along a second direction perpendicular to the first direction is a first bonding pad, and the minimum distance between the first bonding pad and the corresponding side edge of the battery piece body is D, wherein D satisfies the following conditions: d is more than or equal to 9mm and less than or equal to 16 mm;
the plurality of secondary grid lines comprise a plurality of front secondary grid lines, and the plurality of front secondary grid lines are arranged on the front surface of the battery piece body at intervals along the second direction.
2. The cell piece of claim 1, wherein the number of front side secondary grid lines between the first pad and the corresponding side edge of the cell piece body along the second direction is N1Wherein, the N is1Satisfies the following conditions: n is not less than 71≤10。
3. The cell sheet of claim 1, wherein a plurality of the front side gridlines adjacent the side edge of the cell body in the second direction are separated by a plurality of the front side major gridlines into a plurality of minor grid line segments spaced apart from one another;
the plurality of main grid line segments comprise at least one first main grid line segment and at least two second main grid line segments, one side, adjacent to the side edge of the corresponding battery piece body, of the first bonding pad is connected with the first main grid line segment and the two second main grid line segments, the first main grid line segment and the two second main grid line segments extend along the second direction, the first main grid line segment is located between the two second main grid line segments, each second main grid line segment is connected with the end portions of the plurality of auxiliary grid line segments located on the corresponding side of the first main grid line segment, and the length of the first main grid line segment is smaller than that of each second main grid line segment.
4. The battery piece as recited in claim 3, wherein a distance L is provided between an end surface of a free end of the first main grid line segment and the corresponding side edge of the battery piece body along the first direction1Wherein, said L1Satisfies the following conditions: l is not less than 4mm1≤6mm。
5. The battery piece of claim 3, wherein the number of the front side secondary grid lines crossed by the first main grid line segment is N2Wherein, the N is2Satisfies the following conditions: n is not less than 32≤5。
6. The battery cell as recited in claim 3 wherein the two second main grid line segments and the first main grid line segment are parallel to each other.
7. The battery piece of claim 1, wherein the battery piece is a complete battery piece, and the battery piece body comprises a scribing region extending along the first direction;
the bonding pad closest to the scribing region in the bonding pads of each front main grid line is a second bonding pad, and the minimum distance between the second bonding pad and the central line of the scribing region in the second direction is d, wherein d satisfies: d is less than D.
8. The battery piece as recited in claim 7, wherein the D, d is further satisfied: D-D is more than or equal to 3mm and less than or equal to 6 mm.
9. The cell of claim 1, wherein the cell is a complete cell, the cell body comprises a scribe region extending along the first direction, and the main grid line and the sub-grid line are not disposed in the scribe region.
10. The battery piece of claim 1, further comprising:
the auxiliary grid lines are arranged on the front face of the battery piece body at intervals along the first direction and located between two adjacent front face main grid lines, and the maximum width of each auxiliary grid line in the first direction is smaller than that of each front face main grid line in the first direction.
11. The battery piece of claim 10, wherein each auxiliary grid line has a maximum width D in the first direction1Wherein, the D is1Satisfies the following conditions: d is more than or equal to 20 mu m1≤40μm。
12. The battery piece of claim 10, wherein each auxiliary grid line comprises a plurality of auxiliary grid line segments arranged at intervals along the second direction, each auxiliary grid line segment is connected between two front side auxiliary grid lines, and at least two front side auxiliary grid lines are arranged between any two adjacent auxiliary grid line segments in the second direction at intervals.
13. The cell sheet of claim 1, wherein the plurality of bus bars comprises a plurality of back bus bars, the plurality of back bus bars are spaced apart from each other along the first direction and are disposed on the back surface of the cell sheet body, and each back bus bar comprises a plurality of hollow connecting portions;
the plurality of secondary grid lines comprise a plurality of back secondary grid lines, and the plurality of back secondary grid lines are arranged on the back of the battery piece body at intervals along the second direction.
14. The battery piece of claim 13, wherein the material of the front side main grid lines is the same as the material of the front side secondary grid lines, the material of the back side main grid lines is the same as the material of the back side secondary grid lines, and the material of the front side main grid lines is different from the material of the back side main grid lines.
15. The battery cell as recited in claim 14, wherein each of the connecting portions has a rectangular frame structure, each of the connecting portions having a hollow opening;
the back of battery piece body is connected with a plurality of back electrodes, and is a plurality of back electrode is with a plurality of connecting portion one-to-one is connected, every back electrode is located the correspondence the opening part, every back electrode is in orthographic projection area on the back of battery piece body is less than the correspondence the hollow opening of connecting portion is in orthographic projection area on the back of battery piece body.
16. The battery piece of claim 15, wherein the material of the back electrode is different from the material of the back busbar.
17. The battery cell as recited in claim 15 wherein each of the back electrodes is a rectangular sheet and at least one groove is formed in at least one side wall of each of the back electrodes, at least a portion of the groove being opposite the opening.
18. The battery cell as recited in claim 15 wherein the length of each back electrode in the second direction is less than the length of the corresponding connecting portion in the second direction;
the width of each back electrode in the first direction is smaller than that of the corresponding connecting part in the first direction, and the width of each back electrode in the first direction is larger than that of the corresponding opening in the first direction.
19. The battery cell of claim 15, wherein each of the back electrodes is a silver paste.
20. The cell of any one of claims 1-19, wherein the cell body has a length L2Wherein, said L2Satisfies the following conditions: l is not less than 200mm2≤240mm。
21. The battery cell as recited in claim 20 wherein L is2Further satisfies the following conditions: l is2＝210mm。
22. A photovoltaic module comprising a cell sheet according to any one of claims 1 to 21.
23. The photovoltaic module of claim 22, further comprising:
the special-shaped welding strips comprise flat section welding strip sections and non-flat section welding strip sections which are connected with each other, the non-flat section welding strip sections are connected to the front face of the battery piece, and the flat section welding strip sections are connected to the back face of the battery piece.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120467268.1U CN214505504U (en) | 2021-03-04 | 2021-03-04 | Battery piece and photovoltaic module with same |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120467268.1U CN214505504U (en) | 2021-03-04 | 2021-03-04 | Battery piece and photovoltaic module with same |
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| CN214505504U true CN214505504U (en) | 2021-10-26 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114682945A (en) * | 2022-04-08 | 2022-07-01 | 环晟新能源(江苏)有限公司 | Battery welding process of laminated tile assembly |
| CN115020523A (en) * | 2022-06-29 | 2022-09-06 | 浙江晶科能源有限公司 | Solar cell unit, preparation method thereof and solar cell module |
| AU2022218482B1 (en) * | 2022-03-28 | 2023-08-17 | Jinko Solar (Haining) Co., Ltd. | Photovoltaic module and method for manufacturing photovoltaic module |
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2021
- 2021-03-04 CN CN202120467268.1U patent/CN214505504U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU2022218482B1 (en) * | 2022-03-28 | 2023-08-17 | Jinko Solar (Haining) Co., Ltd. | Photovoltaic module and method for manufacturing photovoltaic module |
| CN114682945A (en) * | 2022-04-08 | 2022-07-01 | 环晟新能源(江苏)有限公司 | Battery welding process of laminated tile assembly |
| CN115020523A (en) * | 2022-06-29 | 2022-09-06 | 浙江晶科能源有限公司 | Solar cell unit, preparation method thereof and solar cell module |
| CN115020523B (en) * | 2022-06-29 | 2023-09-12 | 浙江晶科能源有限公司 | Solar cell unit, preparation method thereof and solar cell module |
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