CN215342623U - Strip-shaped battery unit, battery piece and photovoltaic module - Google Patents

Abstract

The utility model discloses a strip-shaped battery unit, a battery piece and a photovoltaic module, wherein the strip-shaped battery unit comprises a silicon substrate, the silicon substrate is provided with two long sides with the same extension direction and two short sides with the extension direction vertical to the extension direction of the long sides and connected with the long sides, the strip-shaped battery unit also comprises 8-15 front main grids arranged on the light receiving surface of the silicon substrate, the extension direction of each front main grid is consistent with the extension direction of the short sides, the 8-15 front main grids are distributed at equal intervals, and the distance between the front main grid on the outermost side and the short side on the corresponding side is smaller than the center interval of the two adjacent front main grids; based on the specific structure of the strip-shaped battery unit provided by the utility model, the strip-shaped battery unit has better power output in a scene of being applied to a photovoltaic assembly, and can better meet the high-power requirement of the industry on the photovoltaic assembly.

Description

Strip-shaped battery unit, battery piece and photovoltaic module

Technical Field

The utility model relates to the field of solar photovoltaics, in particular to a strip-shaped battery unit, a battery piece and a photovoltaic module.

Background

Photovoltaic power generation is a technology of directly converting light energy into electric energy by using the photovoltaic effect of a semiconductor interface. A conventional photovoltaic power generation system mainly comprises three components, namely a photovoltaic component, a controller and an inverter, wherein the photovoltaic component is a core link in the three components. With the rapid development of the photovoltaic industry, the power requirement of the photovoltaic module is higher and higher. Based on the continuous improvement of power requirements, more and more photovoltaic module technologies in the current market cannot well meet the requirements of the application end of a photovoltaic power generation system.

In view of the above, there is a need to provide an improved solution to the above problems.

SUMMERY OF THE UTILITY MODEL

The utility model at least aims to solve the technical problems in the prior art, and in order to achieve the purpose of the utility model, the utility model provides a strip-shaped battery unit which is specifically designed as follows.

A strip-shaped battery unit comprises a silicon substrate, wherein the silicon substrate is provided with two long sides with the same extending direction and two short sides with the extending direction perpendicular to the extending direction of the long sides and connected with the two long sides, the strip-shaped battery unit further comprises 8-15 front main grids arranged on a light receiving surface of the silicon substrate, the extending direction of each front main grid is the same as the extending direction of the short sides, the 8-15 front main grids are distributed at equal intervals, and the distance between the front main grid on the outermost side and the short side on the corresponding side is smaller than the center interval of the two adjacent front main grids.

Further, the length of the long side is n times of the length of the short side, wherein n is a natural number not less than 3.

Further, the length of the long side is 210-230mm, and the distance between the front main grid on the outermost side and the short side on the corresponding side is 10-15 mm.

Furthermore, a plurality of bonding pads are distributed on each front main grid at equal intervals in the length direction, and the distance between the bonding pad closest to the long edge of the silicon substrate and the long edge is smaller than the center interval of two adjacent bonding pads.

Further, the distance between the pad closest to the long edge of the silicon substrate and the long edge is 6-10 mm.

Furthermore, each two adjacent bonding pads comprise a first bonding pad which is relatively close to the long side of the end point and a second bonding pad which is relatively far from the long side of the end point, and the area of the first bonding pad is larger than that of the second bonding pad.

Further, the width of the first pad in the long-side extending direction is larger than the width of the second pad in the long-side extending direction.

Further, the width size range of the bonding pad in the long side extending direction is 0.5-2mm, and the length size range of the bonding pad in the short side extending direction is 0.5-1.5 mm.

Further, the strip-shaped battery unit is also provided with 8-15 back main grids arranged on the backlight surface of the silicon substrate, and the back main grids and the front main grids are the same in number and are in one-to-one correspondence with each other.

Furthermore, each back main grid comprises a plurality of back electrodes arranged at intervals and an aluminum main grid connected with the back electrodes; each back electrode comprises a main body part with the length direction consistent with the extension direction of the short side and convex parts symmetrically arranged on two sides of the main body part; the aluminum main grid comprises a plurality of rectangular frame parts which correspond to the back electrodes one by one and are internally hollowed and a strip line part which is connected with the rectangular frame parts in series; the main body part of the back electrode is positioned in the corresponding rectangular frame part, and the convex parts on two sides of the main body part are connected to the rectangular frame part.

Furthermore, on each back main grid, a plurality of back electrodes are distributed at equal intervals, and the distance between the back electrode closest to the long edge of the silicon substrate and the long edge is smaller than the center distance between two adjacent back electrodes.

Further, the length of the back electrode in the short side extending direction is smaller than the length of the rectangular frame portion, and a gap is formed between both ends of the back electrode and both ends of the rectangular frame portion.

Further, the length of the main body part of the back electrode is 3-8mm, and the width of the main body part of the back electrode is 0.5-1.5 mm; the two sides of the main body part are respectively provided with 3-6 convex parts, the width of each convex part in the extension direction of the short side is 0.6-1.2mm, and the length of each convex part in the extension direction of the long side is 0.5-1 mm.

Further, the distance between the outer edges of the frame lines on two opposite sides of the rectangular frame part in the extension direction of the short side is 7-15mm, the distance between the outer edges of the frame lines on two opposite sides of the rectangular frame part in the extension direction of the long side is 2.1-4.1mm, and the width of the frame line forming the rectangular frame part is 0.4-0.8 mm; the width of the strip line part in the extending direction of the long edge is 0.8-1.6 mm.

The utility model also provides a battery piece which comprises a plurality of strip-shaped battery units, wherein the strip-shaped battery units are sequentially arranged along the extension direction of the short edge and are integrally connected with each other.

Furthermore, two front main grids positioned on the same straight line in the two connected strip-shaped battery units are in a disconnected state at the connection position of the two strip-shaped battery units.

The utility model also provides a photovoltaic module which comprises the strip-shaped battery units, wherein the strip-shaped battery units are mutually independent, and are connected with each other through welding strips.

The utility model has the beneficial effects that: the utility model provides a strip-shaped battery unit different from the prior art, which has better power output in a scene of being applied to a photovoltaic assembly based on a specific structure, and can better meet the high-power requirement of the industry on the photovoltaic assembly.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

FIG. 1 is a schematic plan view of a light-receiving surface side of a strip-shaped battery cell according to the present invention;

FIG. 2 is a schematic plan view of one side of a backlight surface of a strip-shaped battery unit according to the present invention;

FIG. 3 is an enlarged view of a portion a of FIG. 2;

FIG. 4 is a schematic diagram of the distribution of the back electrode on the backlight side of the silicon substrate;

FIG. 5 is an enlarged view of portion a1 of FIG. 4;

FIG. 6 is a schematic diagram of the distribution of the back electric field on the backlight side of the silicon substrate;

FIG. 7 is an enlarged view of portion a2 of FIG. 6;

FIG. 8 is a schematic plan view of a light-receiving surface side of a cell;

FIG. 9 is an enlarged view of portion b of FIG. 8;

fig. 10 is a schematic plan view of the back side of the battery plate.

In the drawing, 100 denotes a silicon substrate, 11 denotes a long side, 12 denotes a short side, 21 denotes a front surface main grid, 210 denotes a pad, 22 denotes a front surface sub-grid, 31 denotes a back surface main grid, 310 denotes a gap, 311 denotes a back electrode, 3111 denotes a main body portion, 3112 denotes a convex portion, 312 denotes an aluminum main grid, 3121 denotes a rectangular frame portion, and 3122 denotes a strip line portion.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1, a strip-shaped battery cell according to the present invention includes a silicon substrate 100, wherein the silicon substrate 100 has two long sides 11 extending in the same direction and two short sides 12 extending in the direction perpendicular to the direction in which the long sides 11 extend and connecting the two long sides 11. As shown in the figure, two long sides 11 and two short sides 12 are enclosed to form an elongated rectangular shape. It will be appreciated that in the practice of the utility model, there may be a chamfer at the location of the connection of the long side 11 to the short side 12.

The strip-shaped battery unit also comprises 8-15 front main grids 21 arranged on the light receiving surface of the silicon substrate 100, the extending direction of each front main grid 21 is consistent with the extending direction of the short edge 12, and the 8-15 front main grids 21 are distributed at equal intervals; more specifically, in the embodiment shown in fig. 1, the strip-shaped battery cell further includes 9 front main grids 21 disposed on the light receiving surface of the silicon substrate 100.

In the present invention, the distance d1 between the outermost front main grid 21 and the corresponding side short edge 12 is smaller than the center-to-center distance d2 between two adjacent front main grids 21. It should be understood that each front main grid 21 has a central axis extending in the same direction as the length direction of the front main grid, and the center-to-center distance d2 between two adjacent front main grids 21 refers to the distance between the central axes of two adjacent front main grids 21.

The utility model also provides a photovoltaic module which comprises the strip-shaped battery unit. Wherein, adjacent bar battery unit is independent each other and is passed through the solder strip and link to each other.

Based on the specific structure of the strip-shaped battery unit provided by the utility model, the strip-shaped battery unit has better power output in a scene of being applied to a photovoltaic assembly, and can better meet the high-power requirement of the industry on the photovoltaic assembly.

Specifically, referring to fig. 1, the light receiving surface of the silicon substrate 100 according to the present invention is further provided with a plurality of front side sub-grids 22 vertically connected to the front side main grid 21, and in an application scenario of a specific photovoltaic module, the front side sub-grids 22 are used for collecting current and collecting the current to the front side main grid 21. In the utility model, the light receiving surface of the silicon substrate 100 is provided with 8-15 front main grids 21, so that the current collection capability of the strip-shaped battery cells can be effectively improved.

In addition, for the strip-shaped battery unit, the current generated in the region between two adjacent front main grids 21 can be converged to two opposite directions to two corresponding different front main grids 21 through the front auxiliary grid 22, and the current generated in the region close to the short side 12 of the strip-shaped battery unit can be converged only in one direction. In the present invention, based on the arrangement manner that the distance d1 between the outermost front main grid 21 and the corresponding side short edge 12 is smaller than the center-to-center distance d2 between two adjacent front main grids 21, it can be ensured that the currents in different regions of the strip-shaped battery cells have approximately the same current collecting rate, and thus the efficiency of the strip-shaped battery cells can be effectively improved.

As a specific embodiment of the present invention, the length of the long side 11 is n times the length of the short side 12; wherein n is a natural number of not less than 3. In the embodiment shown in fig. 1, the length of the long side 11 is 3 times the length of the short side 12.

To effectively increase the power of the photovoltaic module, the long side 21 of the strip-shaped battery cells involved in the present invention has a larger side length dimension than the conventional design. Specifically, the length of the long side 11 is 210-230 mm.

Accordingly, the distance d1 between the outermost front main grid 21 and the corresponding short side 12 is 10-15mm under the premise that the length of the long side 11 is 210-230 mm. For example, when the length of the long side 11 is 210mm, the distance d1 between the outermost front main grid 21 and the corresponding short side 12 is 13 mm.

In order to make the connection between the strip-shaped battery cells and the solder strips in the photovoltaic module more reliable, referring to fig. 1, a plurality of pads 210 are distributed on each front main grid 21 in the utility model at equal intervals in the length direction. Typically, the number of pads 210 on each front side main gate 21 is 4-7; in the embodiment shown in fig. 1, the number of pads 210 on each front side main gate 21 is 5.

Preferably, in the present invention, the distance d3 between the pad 210 nearest to the long side 11 of the silicon substrate 100 and the long side 11 is smaller than the center-to-center distance d4 between two adjacent pads 210. In this way, in a photovoltaic module application scenario, the current generated near the long side 11 of the silicon substrate 100 can be rapidly transmitted to the bonding pad 210 and then output through the bonding tape.

In the practice of the present invention, the distance d3 between the pad 210 closest to the long side 11 of the silicon substrate 100 and the long side 11 is 6-10 mm. Based on the setting of the distance d3, the current generated at the position close to the long edge 11 of the silicon substrate 100 is ensured to have a rapid transmission rate, and meanwhile, the occurrence of undesirable phenomena such as splintering and the like in the assembly process of the photovoltaic module can be reduced.

In the utility model, the front main gate 21 is located on a section between the middle point and an end point, and each two adjacent bonding pads 210 comprise a first bonding pad relatively close to the long side 11 where the end point is located and a second bonding pad relatively far from the long side 11 where the end point is located, wherein the area of the first bonding pad is larger than that of the second bonding pad. Referring specifically to fig. 1, each front-side main gate 21 in this embodiment has 5 pads 210, and there are three pads 210 on a section of the front-side main gate 21 between the midpoint and an end point, and the areas of the three pads 210 gradually increase in a direction from the center point of the front-side main gate 21 to the end point.

Based on the arrangement, when the photovoltaic module is assembled, enough welding tension force can be provided between the position, close to the edge, of the strip-shaped battery unit and the welding strip, and then the reliable connection relation between the strip-shaped battery unit and the corresponding welding strip can be ensured.

Further, it is preferable that the width of the first pad in the direction in which the long sides 11 extend is larger than the width of the second pad in the direction in which the long sides 11 extend. Referring to fig. 1, each front-side main grid 21 in this embodiment has 5 pads 210 thereon, and there are three pads 210 on each side of the midpoint of the front-side main grid 21, and the widths of the respective three pads 210 in the direction of the extension of the long side 11 are gradually increased in the direction from the center point of the front-side main grid 21 to the long side 11.

In specific implementation, the width dimension of the pad 210 in the extending direction of the long side 11 ranges from 0.5 mm to 2mm, and the length dimension of the pad 210 in the extending direction of the short side 12 ranges from 0.5 mm to 1.5 mm. Specifically, in the embodiment shown in fig. 1, on each side of the midpoint of the front-side main gate 21, in the direction from the center of the front-side main gate 21 to the long side 11, the widths of the three pads 210 in the extending direction of the long side 11 are sequentially: 1mm, 1.5mm, 2mm, the length dimension of three pads 210 in the direction that minor face 12 extends is in proper order: 0.6mm, 1 mm.

The strip-shaped battery unit also comprises 8-15 back main grids 31 arranged on the backlight surface of the silicon substrate 100, wherein the number of the back main grids 31 is the same as that of the front main grids 21, and the back main grids 31 and the front main grids 21 are in one-to-one correspondence. Referring to the implementation structure shown in fig. 2, the stripe-shaped battery cell in this embodiment further has 9 back surface main grids 31 disposed on the back surface of the silicon substrate 100, which corresponds to the implementation structure shown in fig. 1.

As shown in fig. 2 and fig. 3, in this embodiment, each back main grid 31 includes a plurality of back electrodes 311 disposed at intervals and an aluminum main grid 312 connected to the plurality of back electrodes 311. Each back electrode 311 includes a main body portion 3111 having a length direction consistent with an extending direction of the short side 12, and protruding portions 3112 symmetrically disposed on two sides of the main body portion 3111; the aluminum main grid 312 comprises a plurality of rectangular frame portions 3121 which correspond to the positions of the back electrodes 311 one by one and are internally hollowed, and strip line portions 3122 which are connected with the rectangular frame portions 3121 in series; the body portion 3111 of the back electrode 311 is located inside the corresponding rectangular frame portion 3121 and the convex portions 3112 on both sides of the body portion 3111 are connected to the rectangular frame portion 3121.

In the present invention, typically, the back electrode 311 is formed by curing conductive silver paste, and the aluminum main gate 312 is formed by curing conductive aluminum paste (or silver-aluminum paste). In a specific implementation process, as shown in fig. 4, 5, 6, and 7, first, a conductive silver paste forming the back electrode 311 is printed on the backlight surface side of the silicon substrate 100, then a conductive aluminum paste forming the aluminum main gate 312 is printed on the backlight surface side of the silicon substrate 100, and then the back main gate 31 is obtained by curing. In practice, the protruding portion 3112 of the back electrode 311 and the rectangular frame portion 3121 are overlapped, i.e., at least a partial region of the protruding portion 3112 and the rectangular frame portion 3121 are overlapped.

In the present invention, on each back surface main gate 31, referring to fig. 2, a plurality of back electrodes 311 are distributed at equal intervals, and a distance d5 between the back electrode 311 closest to the long side 11 of the silicon substrate 100 and the long side 12 is smaller than a center-to-center distance d6 between two adjacent back electrodes 311. Based on the setting, in the application scene of a specific photovoltaic module, the strip-shaped battery unit and the welding strip are ensured to have better connection strength, and meanwhile, the current is enabled to have a better transmission path on the strip-shaped battery unit.

In the present invention, the number of the back electrodes 311 distributed on each back surface main grid 31 at equal intervals is 2-4. In the embodiment shown in fig. 2, 3 back electrodes 311 are distributed on each back main grid 31 at equal intervals. Further, the length of the short side 12 of the long side 11 of the strip-shaped battery cell concerned in this embodiment is 70 mm; the distance d5 between the back electrode 311 closest to the long side 11 of the silicon substrate 100 and the long side 12 is 12.15mm, and the center-to-center distance d6 between two adjacent back electrodes 311 is 22.85 mm.

In the illustrated embodiment, the length L1 of the back electrode 311 in the extending direction of the short side 12 is smaller than the length L5 of the rectangular frame portion, and a gap 310 is formed between both ends of the back electrode 311 and both ends of the rectangular frame portion 3121. In the manufacturing process of the strip-shaped battery cell, the aluminum main grid 312 generally has a thicker thickness relative to the back electrode 311, that is, the top surface of the back electrode 311 is lower than the top surface of the corresponding rectangular frame portion 3121, and the gap 310 according to the present embodiment can provide a certain deformation space for the solder strip when the solder strip is welded to the back electrode 311, thereby ensuring the reliability of the welding between the solder strip and the back electrode 311.

In specific implementation, referring to fig. 5, the main body 3111 of the back electrode 311 has a length L1 of 3-8mm and a width L2 of 0.5-1.5 mm; the body portion 3111 is provided with 3 to 6 convex portions 3112 on each side, and each convex portion 3112 has a width L3 of 0.6 to 1.2mm in the extending direction of the short side 12 and a length L4 of 0.5 to 1mm in the extending direction of the long side 11.

Further, referring to fig. 7, in the present embodiment, the distance L5 (i.e., the length of the rectangular frame portion) between the outer edges of the frame lines on the opposite sides of the rectangular frame portion 3121 in the extending direction of the short side 12 is 7 to 15mm, the distance L6 between the outer edges of the frame lines on the opposite sides of the rectangular frame portion 3121 in the extending direction of the long side 11 is 2.1 to 4.1mm, and the width of the frame line constituting the rectangular frame portion 3121 is 0.4 to 0.8 mm; the width L7 of the stripline portion 3122 in the direction in which the long side 11 extends is 0.8 to 1.6 mm.

It is understood that in the present invention, the backlight surface of the silicon substrate 100 is further provided with a plurality of back sub-grids 32 vertically connected to the back main grid 31. In the implementation process, the back side sub-grid 32 and the aluminum main grid 312 are usually printed and formed synchronously, and the back side sub-grid and the aluminum main grid together form a back electric field of the strip-shaped battery unit.

The utility model also provides a battery piece, which comprises a plurality of strip-shaped battery units, wherein the plurality of strip-shaped battery units are sequentially arranged along the extending direction of the short edge 12 and are integrally connected with each other.

Referring to fig. 8 and 10, the battery pack in this embodiment includes 3 or more strip-shaped battery cells. The battery piece is cut along a cutting line L shown in the figure to obtain strip-shaped battery units.

Preferably, referring to fig. 9, in the present embodiment, two front main grids 21 located on the same straight line in two strip-shaped battery cells connected are in a disconnected state at the connection position of the two strip-shaped battery cells. The design can save the consumption of the conductive paste in the manufacturing of the front main grid 21.

It should be understood that, in order to further reduce the consumption amount of the conductive paste, in other preferred embodiments of the present invention, the two back side main grids 31 located on the same line in the two connected strip-shaped battery cells are also in a disconnected state at the connection position of the two strip-shaped battery cells, and the front side sub-grids 22 and the back side sub-grids 32 are staggered from the connection position of the two connected strip-shaped battery cells.

It should be understood that although the present description refers to embodiments, not every embodiment contains only a single technical solution, and such description is for clarity only, and those skilled in the art should make the description as a whole, and the technical solutions in the embodiments can also be combined appropriately to form other embodiments understood by those skilled in the art.

The above-listed detailed description is only a specific description of a possible embodiment of the present invention, and they are not intended to limit the scope of the present invention, and equivalent embodiments or modifications made without departing from the technical spirit of the present invention should be included in the scope of the present invention.

Claims (17)

1. A strip-shaped battery unit comprises a silicon substrate, wherein the silicon substrate is provided with two long sides with the same extending direction and two short sides with the extending direction perpendicular to the extending direction of the long sides and connected with the two long sides, the strip-shaped battery unit is characterized by further comprising 8-15 front main grids arranged on the light receiving surface of the silicon substrate, the extending direction of each front main grid is the same as the extending direction of the short sides, the 8-15 front main grids are distributed at equal intervals, and the distance between the front main grid on the outermost side and the short side on the corresponding side is smaller than the center interval of the two adjacent front main grids.

2. The strip battery cell as claimed in claim 1, wherein the long side length is n times the short side length, where n is a natural number not less than 3.

3. The strip-shaped battery cell as claimed in claim 2, wherein the length of the long side is 210-230mm, and the distance between the outermost front main grid and the corresponding side short side is 10-15 mm.

4. Strip-shaped battery unit according to any one of claims 1 to 3, wherein a plurality of pads are equally spaced in the length direction of each front side main grid, and the distance between the pad closest to the long side of the silicon substrate and the long side is smaller than the center-to-center distance between two adjacent pads.

5. Bar cell of claim 4, wherein the pad closest to a long side of the silicon substrate is 6-10mm from the long side.

6. Strip-shaped battery unit according to claim 4, wherein each two adjacent pads on a section of the front main grid between the midpoint and an end point comprise a first pad relatively close to the long side edge of the end point and a second pad relatively far from the long side edge of the end point, and the area of the first pad is larger than that of the second pad.

7. The strip-shaped battery cell as claimed in claim 6, wherein the width of the first land in the long-side extending direction is larger than the width of the second land in the long-side extending direction.

8. The strip-shaped battery cell as claimed in claim 7, wherein the width dimension of the land in the long side extending direction is in the range of 0.5-2mm, and the length dimension of the land in the short side extending direction is in the range of 0.5-1.5 mm.

9. Strip battery cell according to any of claims 1 to 3, wherein the strip battery cell further comprises 8 to 15 back side main grids arranged on the back side of the silicon substrate, the back side main grids and the front side main grids are equal in number and correspond to each other one by one.

10. Strip cell of claim 9, wherein each of the back side primary grids comprises a plurality of spaced apart back electrodes and an aluminum primary grid connecting the plurality of back electrodes; each back electrode comprises a main body part with the length direction consistent with the extension direction of the short side and convex parts symmetrically arranged on two sides of the main body part; the aluminum main grid comprises a plurality of rectangular frame parts which correspond to the back electrodes one by one and are internally hollowed and a strip line part which is connected with the rectangular frame parts in series; the main body part of the back electrode is positioned in the corresponding rectangular frame part, and the convex parts on two sides of the main body part are connected to the rectangular frame part.

11. The strip-shaped battery unit as claimed in claim 10, wherein a plurality of the back electrodes are equally spaced on each back main grid, and the distance between the back electrode nearest to the long side of the silicon substrate and the long side is smaller than the center-to-center distance between two adjacent back electrodes.

12. The strip-shaped battery cell according to claim 10, wherein a length of the back electrode in the direction in which the short side extends is smaller than a length of the rectangular frame portion, and gaps are formed between both ends of the back electrode and both ends of the rectangular frame portion.

13. The strip battery cell as claimed in claim 10, wherein the back electrode has a body portion length of 3-8mm and a width of 0.5-1.5 mm; the two sides of the main body part are respectively provided with 3-6 convex parts, the width of each convex part in the extension direction of the short side is 0.6-1.2mm, and the length of each convex part in the extension direction of the long side is 0.5-1 mm.

14. The strip-shaped battery cell according to claim 13, wherein the distance between the outer edges of the frame wires on opposite sides of the rectangular frame portion in the extending direction of the short side is 7 to 15mm, the distance between the outer edges of the frame wires on opposite sides of the rectangular frame portion in the extending direction of the long side is 2.1 to 4.1mm, and the width of the frame wire constituting the rectangular frame portion is 0.4 to 0.8 mm; the width of the strip line part in the extending direction of the long edge is 0.8-1.6 mm.

15. A battery sheet comprising a plurality of the strip-shaped battery cells according to any one of claims 1 to 14, wherein the plurality of the strip-shaped battery cells are arranged in series along the extending direction of the short side and integrally connected with each other.

16. The battery piece as recited in claim 15, wherein the two front main grids located on the same line in the two connected strip-shaped battery units are in a disconnected state at the connection position of the two strip-shaped battery units.

17. A photovoltaic module comprising strip-shaped cells according to any one of claims 1 to 14, adjacent strip-shaped cells being independent of each other and connected to each other by solder ribbons.

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