DE202023104542U1 - Solar cell and photovoltaic module - Google Patents

Abstract

Solar cell, characterized in that it comprises:
a substrate (100), wherein the substrate X comprises first regions (10), an intermediate region (20) being provided between every two of the first regions, whereby X 2 ≤
M metal contacts (21) arranged one behind the other in a first direction (Y), each of the metal contacts (21) being located on each of the first areas (10);
K electrical connection lines (101), each of which is electrically connected to H metal contacts (21) located close to one end of the substrate or H metal contacts (21) located close to the intermediate region (20), where for H 2 ≤ H ≤ 12 applies;
the width of the electrical connecting line (101) being in the range of 8 to 60 µm along the direction (X) of the metal contacts; wherein along the first direction (Y), the electrical connecting line (101) has a length range of 2 to 50 mm.

Description

TECHNICAL FIELD

The various embodiments of the present disclosure relate to the field of photovoltaics and, more particularly, to a solar cell and a photovoltaic module.

BACKGROUND

A solar cell is a device that converts light energy directly into electrical energy through a photoelectric effect or a photochemical effect. Individual solar cells cannot directly generate electricity. Multiple individual cells must be encapsulated into a module for use by solder tape chains and parallel connections. Solar modules (also called solar panels) are the core of solar power generation systems and the most important part of solar power generation systems. The job of solar panels is to convert solar energy into electrical energy, send it to be stored in a battery, or power the load to work.

The solar cell is very fragile, and it is generally necessary to provide a film and a cover on the top and bottom surfaces of the cell module to protect the cells. The cover is generally made of photovoltaic glass, and the photovoltaic glass cannot be attached directly to the cell, and a film must be used between them for bonding. The connection between the cells typically requires a solder tape to collect current, and the traditional solder tape needs to be alloyed by soldering between the solder tape and the contact finger during welding. However, the melting point of the solder in the solder tape is generally high, and during the actual welding process, the soldering temperature is more than 20°C higher than the melting point of the solder. During the soldering process, the cell is severely warped and deformed, the risk of cracking after soldering is large, and the breakage rate is high. In order to improve soldering quality, low-temperature soldering tapes and busbarless technologies were developed against this background. However, there are still many factors that affect the yield of the modules, such as the soldering effect between the soldering tape and the contact finger and the soldering yield.

SHORT PRESENTATION

Embodiments of the utility model provide a solar cell and a photovoltaic module, which are useful at least for increasing the good part yield of the photovoltaic modules.

According to some embodiments of the utility model, one aspect of the embodiments of the utility model provides a solar cell. It comprises: a substrate, wherein the substrate X comprises first regions, an intermediate region being provided between every two of the first regions, where X 2 ≤ M metal contacts arranged one behind the other in a first direction, each of the metal contacts being on each of the first areas; K electrical connection lines, each of which is electrically connected to H metal contacts close to one end of the substrate or H metal contacts close to the intermediate region, where H 2 ≤ H ≤ 12; the width of the electrical connecting line being in the range from 8 to 60 µm along the direction of the metal contacts; wherein along the first direction the electrical connecting line has a length range of 2 to 50 mm.

In some embodiments, each of the metal contacts includes N+1 body portions and N separation portions; wherein the solar cell includes: a reinforcing contact, the reinforcing contact located in each of the separation portions and electrically in contact with the body portion; wherein along the first direction each of the electrical connection lines is immediately opposite each of the reinforcing contacts; where K = X * 2N.

In some embodiments, it is provided that the reinforcing contact has a length range of 0.015 to 0.6 mm along the first direction and the reinforcing contact has a length range of 0.5 to 4.5 mm along the second direction.

In some embodiments, it is provided that the solar cell further comprises: a passivation layer located on the surface of the substrate.

In some exemplary embodiments it is provided that N 12 ≤ N ≤ 30 applies.

In some embodiments, the reinforcing contact is provided to include a first portion and a second portion extending along a second direction, the first portion being in contact with the body portion and the second portion being used for contact with a solder tape.

In some exemplary embodiments it is provided that a third width W3 of an end of the first section facing away from the second section is larger than a fourth width W4 of the contact surface between the first section and the second section.

In some exemplary embodiments it is provided that the third width W3 has a range of 0.02 mm ≤ W3 ≤ 1.5 mm.

In some exemplary embodiments it is provided that the fourth width W4 has a range of 0.02 mm ≤ W4 ≤ 2 mm.

In some exemplary embodiments it is provided that the length L7 of the second section is in the range of 0.01 mm ≤ L7 ≤ 1.5 mm.

In some exemplary embodiments it is provided that the length L8 of the first section is in the range of 0.05 mm ≤ L8 ≤ 1.5 mm.

In some embodiments, the length L3 of the overlapping area between the reinforcing contact and the body portion in the second direction is 0.05 to 1.5 mm.

In some embodiments, it is provided that the solar cell further comprises: an auxiliary soldering point arranged on both sides of the reinforcing contact, wherein a portion of the auxiliary soldering point overlaps with the body portion in the second direction and electrically contacts it.

In some embodiments, it is provided that the body portion is in electrical contact with a part of the top of the auxiliary soldering point along the thickness direction of the metal contact; alternatively, the body portion is in electrical contact with a portion of the bottom side of the auxiliary soldering point.

In some embodiments it is provided that the width of the auxiliary soldering point along the first direction is greater than the width of the body section.

In some exemplary embodiments it is provided that the auxiliary soldering point has a fifth width W5 along the first direction on a side facing away from the reinforcing contact and the auxiliary soldering point has a seventh width W7 along the first direction on a side in contact with the reinforcing contact, the fifth width W5 is larger than the seventh width W7.

In some exemplary embodiments it is provided that 0.02 mm ≤ W5 ≤ 1.5 mm applies to the area of the fifth width (W5).

In some exemplary embodiments it is provided that 0.02 mm ≤ W7 ≤ 2 mm applies to the area of the seventh width (W7).

In some exemplary embodiments it is provided that the auxiliary soldering point has a length L5 in the range of 0.05 mm ≤ L5 ≤ 1.5 mm along the second direction.

In some embodiments, it is provided that the overlap between the auxiliary soldering point and the body portion has a length of L5 in the second direction, for which 0.05 mm ≤ L5 ≤ 1.5 mm applies.

In some embodiments it is provided that the substrate has a length of 180 to 220 mm along the first direction; where M within the same substrate is: 100 ≤ M ≤ 200; where the following applies to the number M3 of metal contacts in the first area: 100/X ≤ M3 ≤ 200/X.

In some embodiments it is provided that the substrate has a front side and a back side which are arranged opposite one another; wherein the metal contact comprises: a first number M1 of first contact fingers located on the front of the substrate, where M1 is: 100 ≤ M1 ≤ 180; a second number M2 of second contact fingers located on the back of the substrate, where M2 is greater than M1 and for M2 the following applies: 150 ≤ M2 ≤ 200.

In some exemplary embodiments it is provided that the first contact finger has a width range of 10 to 17 μm along the first direction; wherein along the first direction the width of the second contact finger is 14 to 20 μm.

According to some embodiments of the utility model, another aspect of the embodiments of the utility model further provides a solar cell with X subcells, where X 2 ≤ X ≤ 10; wherein the solar cell comprises: a substrate; W electrodes arranged one behind the other in a first direction, each of the electrodes being on each of the substrates; 2N electrical connection lines, each of the electrical connection lines being electrically connected to H electrodes located close to one end of the substrate, where H is: 2 ≤ H ≤ 12; the width of the electrical connecting line being 8 to 60 µm along the direction of extension of the electrode; wherein along the first direction the length of the electrical connecting line is 2 to 50 mm.

In some embodiments, each of the electrodes includes N+1 body portions and N separation portions; wherein the solar cell includes: a reinforcing contact, the reinforcing contact located in each of the separation portions and electrically in contact with the body portion; wherein along the first direction each of the electrical connection lines is immediately opposite each of the reinforcing contacts.

In some exemplary embodiments it is provided that N 12 ≤ N ≤ 30 applies.

In some embodiments it is provided that the substrate has a length of 180 to 220 mm along the first direction; where for W within the same substrate: 100/X ≤ W ≤ 200/X.

According to some embodiments of the utility model, another aspect of the embodiments of the utility model further provides a photovoltaic module. It comprises a cell string which is formed by a plurality of solar cells electrically connected via a solder tape according to one of the above exemplary embodiments, the solder tape being electrically connected to each of the metal contacts, the solder tape being electrically in contact with the reinforcing contact and the soldering tape being electrically connected to the electrical connecting line is in contact; an encapsulation layer for covering a surface of the cell string; a cover plate for covering a surface of the encapsulation layer facing away from the cell strand.

• In der technischen Lösung, die durch das Gebrauchsmuster bereitgestellt wird, ist eine elektrische Verbindungsleitung am Ende der Zelle angeordnet, und die elektrische Verbindungsleitung ist elektrisch mit 2 bis 12 Metallkontakten, die nahe an dem Ende des Substrats angeordnet sind, oder 2 bis 12 Metallkontakten, die nahe an dem Zwischenbereich angeordnet sind, verbunden, so dass die elektrische Verbindungsleitung die Lötfläche zwischen der Zelle und dem Lötband erhöhen kann und die elektrische Verbindungsleitung die Lötspannung zwischen der Zelle und dem Lötband verbessern kann, wodurch der Löteffekt zwischen der Zelle und dem Lötband verbessert wird. Die elektrische Verbindungsleitung verbindet nur einen Teil der Metallkontakte anstatt aller Metallkontakte, so dass die verdeckte Fläche der Oberfläche des Substrats gering ist, wodurch die Zelleneffizienz der Solarzelle verbessert wird. Die elektrische Verbindungsleitung befindet sich am Ende des Substrats, was die Stromsammelfähigkeit des Substratendes verbessern kann, wodurch die Zelleneffizienz verbessert wird.

The technical solution of the exemplary embodiments of the present utility model is characterized by at least the following advantages:

• In the technical solution provided by the utility model, an electrical connection line is arranged at the end of the cell, and the electrical connection line is electrically connected with 2 to 12 metal contacts arranged close to the end of the substrate, or 2 to 12 metal contacts, which are arranged close to the intermediate region, so that the electrical connection line can increase the soldering area between the cell and the solder tape, and the electrical connection line can improve the soldering voltage between the cell and the solder tape, thereby improving the soldering effect between the cell and the solder tape becomes. The electrical connection line connects only a part of the metal contacts instead of all metal contacts, so that the hidden area of the surface of the substrate is small, thereby improving the cell efficiency of the solar cell. The electrical connection line is located at the end of the substrate, which can improve the current collecting ability of the substrate end, thereby improving cell efficiency.

In addition, a reinforcing contact is arranged in the solar cell, and the reinforcing contact can increase the soldering voltage between the metal contacts and the solder tape, thereby improving the soldering effect between the metal contacts and the solder tape. The electrical connection line is arranged in the solar cell, and the electrical connection line can collect the current of the contact finger near the end and the intermediate area of the cell, thereby avoiding the problem of damage caused by the solder tape at the end.

BRIEF DESCRIPTION OF THE DRAWINGS

• 1 eine schematische strukturelle Darstellung einer Solarzelle nach einem Ausführungsbeispiel des vorliegenden Gebrauchsmusters;
• 2 eine erste schematische strukturelle Schnittdarstellung durch A1-A2 gemäß 1;
• 3 eine erste schematische strukturelle Schnittdarstellung durch B1-B2 gemäß 1;
• 4 eine erste schematische strukturelle Schnittdarstellung durch C1-C2 gemäß 1;
• 5 eine zweite schematische strukturelle Schnittdarstellung durch C1-C2 gemäß 1;
• 6 eine dritte schematische strukturelle Schnittdarstellung durch C1-C2 gemäß 1;
• 7 eine vierte schematische strukturelle Schnittdarstellung durch C1-C2 gemäß 1;
• 8 eine erste schematische strukturelle Teildarstellung einer elektrischen Verbindungsleitung der Solarzelle nach einem Ausführungsbeispiel des vorliegenden Gebrauchsmusters;
• 9 eine erste schematische strukturelle Teildarstellung eines Verstärkungskontakts der Solarzelle nach einem Ausführungsbeispiel des vorliegenden Gebrauchsmusters;
• 10 eine zweite schematische strukturelle Teildarstellung des Verstärkungskontakts der Solarzelle nach einem Ausführungsbeispiel des vorliegenden Gebrauchsmusters;
• 11 eine dritte schematische strukturelle Teildarstellung des Verstärkungskontakts der Solarzelle nach einem Ausführungsbeispiel des vorliegenden Gebrauchsmusters;
• 12 eine vierte schematische strukturelle Teildarstellung des Verstärkungskontakts der Solarzelle nach einem Ausführungsbeispiel des vorliegenden Gebrauchsmusters;
• 13 eine erste schematische strukturelle Teildarstellung der Solarzelle nach einem Ausführungsbeispiel des vorliegenden Gebrauchsmusters;
• 14 eine zweite schematische strukturelle Teildarstellung der Solarzelle nach einem Ausführungsbeispiel des vorliegenden Gebrauchsmusters;
• 15 eine andere schematische strukturelle Darstellung der Solarzelle nach einem Ausführungsbeispiel des vorliegenden Gebrauchsmusters;
• 16 eine schematische strukturelle Darstellung eines Photovoltaikmoduls eines Ausführungsbeispiels des Gebrauchsmusters;
• 17 eine erste schematische strukturelle Darstellung eines gebildeten Lötbands bei dem Photovoltaikmodul eines Ausführungsbeispiels des Gebrauchsmusters;
• 18 eine zweite schematische strukturelle Darstellung des gebildeten Lötbands bei dem Photovoltaikmodul eines Ausführungsbeispiels des Gebrauchsmusters.

An exemplary description is given using one or more exemplary embodiments with reference to the associated accompanying drawings. The exemplary embodiment is in no way restricted by the exemplary description. Unless otherwise stated, there are no restrictions regarding scale in the accompanying drawings. In order to better explain the technical solution in exemplary embodiments according to the present utility model or in conventional technologies, the accompanying drawings describing the exemplary embodiments are briefly described below, it being understood that the following drawings only represent some exemplary embodiments of the utility model and are intended for average specialists in this field It is possible to obtain further drawings from such drawings without any inventive steps. Show in it

• 1 a schematic structural representation of a solar cell according to an exemplary embodiment of the present utility model;
• 2 a first schematic structural sectional view through A1-A2 according to 1 ;
• 3 a first schematic structural sectional view through B1-B2 according to 1 ;
• 4 a first schematic structural sectional view through C1-C2 according to 1 ;
• 5 a second schematic structural sectional view through C1-C2 according to 1 ;
• 6 a third schematic structural sectional view through C1-C2 according to 1 ;
• 7 a fourth schematic structural sectional view through C1-C2 according to 1 ;
• 8th a first schematic structural partial representation of an electrical connecting line of the solar cell according to an exemplary embodiment of the present utility model;
• 9 a first schematic structural partial representation of a reinforcing contact of the solar cell according to an exemplary embodiment of the present utility model;
• 10 a second schematic partial structural representation of the reinforcing contact of the solar cell according to an embodiment of the present utility model;
• 11 a third partial schematic structural representation of the reinforcing contact of the solar cell according to an exemplary embodiment of the present utility model;
• 12 a fourth partial schematic structural representation of the reinforcing contact of the solar cell according to an exemplary embodiment of the present utility model;
• 13 a first schematic structural partial representation of the solar cell according to an exemplary embodiment of the present utility model;
• 14 a second schematic partial structural representation of the solar cell according to an exemplary embodiment of the present utility model;
• 15 another schematic structural representation of the solar cell according to an embodiment of the present utility model;
• 16 a schematic structural representation of a photovoltaic module of an embodiment of the utility model;
• 17 a first schematic structural representation of a solder strip formed in the photovoltaic module of an exemplary embodiment of the utility model;
• 18 a second schematic structural representation of the solder strip formed in the photovoltaic module of an exemplary embodiment of the utility model.

DETAILED DESCRIPTION OF EMBODIMENTS

It is known from the prior art that the good part yield of current photovoltaic modules is not sufficient.

In the solar cell provided by the utility model, an electrical connection line is disposed at the end of the cell, and the electrical connection line is electrically connected to 2 to 12 metal contacts disposed close to the end of the substrate or 2 to 12 metal contacts are arranged close to the intermediate region, so that the electrical connection line can increase the soldering area between the cell and the solder tape, and the electrical connection line can improve the soldering voltage between the cell and the solder tape, thereby improving the soldering effect between the cell and the solder tape . The electrical connection line connects only a part of the metal contacts instead of all metal contacts, so that the hidden area of the surface of the substrate is small, thereby improving the cell efficiency of the solar cell. The electrical connection line is located at the end of the substrate, which can improve the current collecting ability of the substrate end, thereby improving cell efficiency.

Individual exemplary embodiments of the present utility model will be discussed in more detail below with reference to the accompanying drawings. However, one of ordinary skill in the art can understand that many technical details are suggested in the embodiments of the utility model to enable the reader to better understand the utility model. However, the embodiment claimed in the present utility model can also be realized without these technical details and through changes and modifications based on the following exemplary embodiments.

Show it 1 a schematic structural representation of a solar cell according to an exemplary embodiment of the present utility model; 2 a first schematic structural sectional view through A1-A2 according to 1 ; 3 a first schematic structural sectional view through B1-B2 according to 1 ; 4 a first schematic structural sectional view through C1-C2 according to 1 ; 5 a second schematic structural sectional view through C1-C2 according to 1 ; 6 a third schematic structural sectional view through C1-C2 according to 1 ; 7 a fourth schematic structural sectional view through C1-C2 according to 1 ; 8th a first schematic structural partial representation of an electrical connecting line of the solar cell according to an exemplary embodiment of the present utility model; 9 a first schematic structural partial representation of a reinforcing contact of the solar cell according to an exemplary embodiment of the present utility model; 10 a second schematic partial structural representation of the reinforcing contact of the solar cell according to an embodiment of the present utility model; 11 a third schematic structural partial representation of the reinforcing contact of the solar cell according to an exemplary embodiment of the present the utility model; 12 a fourth partial schematic structural representation of the reinforcing contact of the solar cell according to an exemplary embodiment of the present utility model; 13 a first schematic structural partial representation of the solar cell according to an exemplary embodiment of the present utility model; 14 a second schematic structural partial representation of the solar cell according to an exemplary embodiment of the present utility model. In order to schematically show the relative positional relationship between the electrical connection line, the metal contact and the solder tape, the solder tape is also in 2 and 4 until 7 shown.

It is understandable that in 2 until 7 only the positional relationship of the individual layer on the front side of the substrate is indicated, the cross section of the back side not being shown here, and the back side may have the same or different positional relationship as the single layer on the front side.

It will be on 1 until 14 pointed out. According to some embodiments of the utility model, one aspect of the embodiments of the utility model provides a solar cell. It comprises: a substrate 100, wherein the substrate 100 comprises X first regions 10, an intermediate region 20 being provided between every two of the first regions 10, whereby M metal contacts 21 arranged one behind the other in a first direction Y, each of the metal contacts 21 being located on each of the first areas 10; K electrical connection lines 101, each of which is electrically connected to H metal contacts 21 close to one end of the substrate 100 or H metal contacts 21 close to the intermediate region 20, where H 2 ≤ H ≤ 12.

In some embodiments, H is 2 to 4, 4 to 6, 6 to 8, 8 to 10, or 10 to 12.

Solar cells can be one of the conventional cells TOPCON cells (Tunnel Oxide Passivated Contact), PERC cells (Passivated emitter and rear cell), and heterojunction cells. In some embodiments, solar cells can also be compound semiconductor cells. The compound semiconductors include, but are not limited to, materials such as silicon germanium, silicon carbide, gallium arsenide, indium gallium, perovskite, cadmium telluride, copper-indium-selenium and the like.

The solar cell includes a substrate and a passivation layer that are arranged one above the other. The material of the substrate 100 may be an elemental semiconductor material. Specifically, the elementary semiconductor material consists of a single element, for example silicon or germanium. Here, an elemental semiconductor material may be a single crystal state, a polycrystalline state, an amorphous state or a microcrystalline state (the state containing both a single crystal state and an amorphous state is called a microcrystalline state). For example, silicon may be at least one of single crystal silicon, polysilicon, amorphous silicon, or microcrystalline silicon.

In some embodiments, the material of the substrate 100 may also be a compound semiconductor material. Common compound semiconductor materials include, but are not limited to, silicon germanium, silicon carbide, gallium arsenide, indium gallium, perovskite, cadmium telluride, copper-indium-selenium, and other materials. The substrate 100 may also be a sapphire substrate, a silicon substrate on an insulator, or a germanium substrate on an insulator.

In some embodiments, the substrate 100 may be an N-type semiconductor substrate or a P-type semiconductor substrate. The N-type semiconductor substrate is doped with an N-type doping element, and the N-type doping element may be one of the V elements such as phosphorus (P) element, bismuth (Bi) element, bismuth (Sb) element or arsenic (As) - element. The P-type semiconductor substrate is doped with P-type elements, and the P-type doping element may be one of the group III elements such as boron (B) element, aluminum (Al) element, gallium (Ga) element or indium (In).

In some embodiments, the solar cell further includes: a passivation layer 103 located on the surface of the substrate 100. The material of the passivation layer 103 includes one or more of silicon oxide, silicon nitride, silicon oxynitride, silicon carbon oxynitride, titanium oxide, hafnium oxide, or aluminum oxide.

The solar cell includes an emitter, a first passivation layer and a second passivation layer, wherein the emitter and the first passivation layer are arranged on the front of the substrate 100 and the second passivation layer is arranged on the back of the substrate 100. The metal contact passes through the first passivation layer and is in electrical contact with the emitter. The metal contact runs through the thickness of the second passivation layer and is in electrical contact with the back. The passivation layer 103 includes a first passivation layer and a second passivation layer.

In some embodiments, if the solar cell is a TOPCON cell, the solar cell may also include a tunnel dielectric layer and a doped conductive layer arranged one above the other, the tunnel dielectric layer is on the back of the substrate 100 and the metal contact burns through the second Passivation layer through and is in electrical contact with the doped conductive layer.

In some embodiments, the metal contact 21 is a contact finger of the solar cell, and the contact finger may be formed by sintering the burnout slurry. The method for forming the metal contact 21 includes printing a metal slurry on a partial surface of the passivation layer by a screen printing method. The metal slurry may comprise at least one of silver, rate, copper, tin, gold, lead or nickel. A sintering process is performed on the metal slurry, and in some embodiments, the metal slurry includes a material with a highly corrosive component such as glass, such that during the sintering process, the corrosive component corrodes the passivation layer so that the metal slurry penetrates the passivation layer 103 to electrically communicate with the substrate 100 to come into contact.

In some embodiments, the metal contact 21 includes, along the first direction Y, a plurality of first metal contacts 110 that are in electrical contact with the electrical connection line 101 and a plurality of second metal contacts 120 that are not electrically in contact with the electrical connection line 101.

In some embodiments, the material of the electrical connection line 101 is the same as the material of the first metal contact 110, and the electrical connection line 101 and the first metal contact 110 are manufactured in the same printing process step.

In some exemplary embodiments, a first length L1 of the electrical connecting line 101 lies in the range of 8 to 60 μm along the direction X of the metal contacts 21. The first length L1 can be 8 to 20 µm, 20 to 35 µm, 35 to 50 µm, 50 to 60 µm, 28 to 55 µm, 13 to 52 µm or 22 to 45 µm. The first length L1 can be 10.3 µm, 21.8 µm, 32.7 µm, 43.6 µm, 55.8 µm or 60 µm.

In some embodiments, a first width W1 of the electrical connection line 101 along the first direction Y is in the range of 2 to 50 mm. The first width W1 may be 2 to 10 mm, 10 to 20 mm, 20 mm to 30 mm, 30 to 40 mm, 40 to 50 mm, 16 to 28 mm or 19 to 50 mm. The first width W1 can be 2mm, 18mm, 21mm, 33mm, 35mm, 42mm, 46mm or 50mm.

In some embodiments, each metal contact 21 includes a second metal contact 120, and the second metal contact 120 includes: N+1 body portions 121 and N separation portions 122; The solar cell further includes: a reinforcing contact 102 disposed at each separation portion 122 and electrically in contact with the body portion 121; Along the first direction, each electrical connection line 101 directly opposes each reinforcing contact 102; Here K = X * 2N. The separation portion 122 refers to a lack of connection between adjacent body portions 121, that is, a metal slurry is not printed in an area between the body portions 121, whereby the area between the body portions 121 is not continuous.

In some embodiments, the range of length L4 of the separating portion 122 along the second direction is, thereby improving the problem of insufficient solder connection between the solder tape and the metal contact. When the length L4 of the separation portion 122 along the second direction When the length L4 of the separating portion 122 in the second direction

In some embodiments, the two ends of the reinforcing contact 102 are in electrical contact with the body portion 121. The reinforcing contact 102 is in electrical contact with the solder ribbon 40, thereby increasing the soldering performance between the cell and the solder ribbon 40.

In some embodiments, the printing slurry of the reinforcing contact 102 is different from the printing slurry of the body portion 121, and the printing slurry of the reinforcing contact 102 is the same as the printing slurry of the bus bar, and the reinforcing contact 102 does not pass through the thickness of the passivation layer 103 and is in electrical contact with it Body section 121. In this way the contact between the Reinforcing contact 102 and the solder tape 40 are sufficient, and the material of the reinforcing contact 102 is the bus bar printing slurry, and the bus bar printing slurry has less silver-containing components, thereby reducing the manufacturing cost. Secondly, the reinforcing contact 102 does not need to penetrate through the passivation layer 103 by burning, which can reduce the time of the sintering process to reduce the thermal damage of the cell.

In some embodiments, the side surface of the reinforcement contact 102 is in electrical contact with the body portion 121 in the second direction Reinforcing contact 102 along the thickness direction of the metal contact 21 in electrical contact with the body portion 121, which increases the contact area between the body portion 121 and the reinforcing contact 102 and further reduces the misalignment problem during the overprinting process of the body portion 121 and the reinforcing contact 102, thereby improving the good part yield of the cell becomes.

In some embodiments, the length W2 of the reinforcing contact 102 along the first direction is in the range of 0.015 to 0.6 mm and the length L2 of the reinforcing contact 102 in the second direction X is in the range of 0.5 to 4.5 mm. The length L2 of the reinforcement contact 102 can ensure the area in which the solder tape 40 and the reinforcement contact 102 are aligned with each other, thereby ensuring that the area in which the solder tape 40 is in contact with the cell is the reinforcement contact 102, thereby the contact area and the contact performance between the cell and the solder tape 40 can be improved. The length of the reinforcing contact 102 should also not be too long, otherwise the area of the cell's collection current will be reduced and the cell efficiency will be reduced.

In some embodiments it is provided that the reinforcement contact 102, as in 11 shown comprises a first section 33 and a second section 32 extending along the second direction The third width W3 of the end of the first section 33 facing away from the second section 32 is larger than the fourth width W4 of the contact surface of the first section 33 and the second section 32, and if the second metal contact 120 is overprinted twice, the first section 33 can also the larger third width W3 ensure that the deviation area between every second metal contact 120 and the reinforcing contact 102 becomes larger, thereby improving the good part yield of the cell. Further, the difference between the third width W3 and the fourth width W4 causes the first portion 33 along the side surface of the first direction Y to be used as a guide groove, thereby reducing the hidden area of the reinforcing contact 102 while increasing the success rate of alignment between the second Metal contact 120 and the reinforcing contact 102 is improved.

In some embodiments, the length L7 of the second section 32 is in the range of 0.01 mm ≤ L7 ≤ 1.5 mm. The range of L7 can be 0.01 to 0.17mm, 0.18 to 1.31mm, 0.23 to 1.5mm, 0.88 to 1.48mm, 0.5 to 1.1mm, 0.6 to 1.27 mm or 0.09 to 0.92 mm. L7 can be 0.01mm, 0.29mm, 0.38mm, 0.76mm, 1.02mm, 1.16mm, 1.29mm, 1.41mm or 1.5mm.

In some embodiments, the length L8 of the first section 33 is in the range of 0.05 mm ≤ L8 ≤ 1.5 mm. The range of L8 can be 0.06 to 0.17mm, 0.2 to 1.38mm, 0.25 to 1.48mm, 0.93 to 1.42mm, 0.46 to 1.12mm, 0.7 to 1.8 mm or 0.14 to 1.45 mm. L8 can be 0.05mm, 0.28mm, 0.41mm, 0.86mm, 1.08mm, 1.14mm, 1.24mm, 1.43mm or 1.5mm.

In some embodiments, the third width W3 has a range of 0.02 mm ≤ W3 ≤ 1.5 mm. The range of the third width W3 can be 0.02 to 0.8 mm, 0.18 to 1.39 mm, 0.2 to 1.5 mm, 0.9 to 1.48 mm, 0.5 to 1 mm, 0.6 to 1.3 mm or 0.09 to 0.8 mm. The third width W3 can be 0.06mm, 0.58mm, 0.77mm, 0.98mm, 1.19mm, 1.28mm, 1.33mm, 1.42mm or 1.5mm .

In some embodiments, the fourth width W4 has a range of 0.02 mm ≤ W4 ≤ 2 mm. The range of the fourth width W4 can be 0.02 to 1.21 mm, 0.18 to 1.68 mm, 0.2 to 1.97 mm, 0.9 to 1.59 mm, 0.5 to 1.31 mm, 0.6 to 1.38 mm or 0.09 to 0.94 mm. The fourth width W4 can be 0.06mm, 0.78mm, 1.22mm, 1.58mm, 1.67mm, 1.78mm, 1.87mm, 1.92mm or 2mm.

In some embodiments, the length L3 of the overlapping area between the reinforcing contact 102 and the body portion 121 is intended to be 0.05 to 1.5 mm, as shown 11 results. The range of L3 can be 0.06 to 0.17mm, 0.2 to 1.38mm, 0.25 to 1.48mm, 0.93 to 1.42mm, 0.46 to 1.12mm, 0.7 to 1.8 mm or 0.14 to 1.45 mm. L3 can be 0.05mm, 0.28mm, 0.41mm, 0.86mm, 1.08mm, 1.14mm, 1.24mm, 1.43mm or 1.5mm.

In some embodiments, the solar cell further comprises: an auxiliary soldering point 105 disposed on both sides of the reinforcing contact 102, a partial length of the auxiliary soldering point 105 overlapping and electrically contacting the body portion 121, as shown in FIG 12 shown. The auxiliary soldering point 105 and the reinforcing contact 102 are integrally formed, and the auxiliary soldering point 105 is also formed by the pressure slurry of the bus bar.

In some embodiments, the auxiliary soldering point 105 is used to improve the accuracy of alignment between the reinforcing contact 102 and the second metal contact 120 and to avoid displacement and misalignment between the second metal contact 120 and the reinforcing contact 102, thereby causing excessive contact resistance between the second Metal contact 120 and the reinforcement contact 102 or a broken metal contact is caused. The auxiliary soldering point 105 is also used to increase the contact area between the reinforcing contact 102 and the second metal contact 120, thereby ensuring the connection performance between the reinforcing contact 102 and the second metal contact 120, thereby ensuring the soldering performance between the soldering tape 40 and the cell This avoids the loosening of the solder connection between the solder tape 40 and the cell.

In some embodiments, the body portion 121 is in electrical contact with a portion of the top of the auxiliary solder pad 105 along the thickness direction of the second metal contact 120; alternatively, the body portion 121 is in electrical contact with a part of the bottom side of the auxiliary soldering point 105. Compared with the electrical contact between the side surface of the body portion 121 and the side surface of the auxiliary soldering point 105 in the second direction cell efficiency is improved.

In some exemplary embodiments, it is provided that the width of the auxiliary soldering point 105 along the first direction Y is greater than the width of the body section 121. The width of the auxiliary soldering point 105 is large. When the auxiliary soldering pad 105 is printed and then the body portion 121 is overprinted twice, the auxiliary soldering pad 105 with a large width can ensure that the deviation range between every other metal contact 120 and the reinforcing contact 102 becomes larger, thereby improving the good part yield of the cell.

It should be noted that the width of the auxiliary soldering pad 105 is larger than the width of the second metal contact 120, but should not be too large, thereby reducing the hidden area of the solar cell and improving the cell efficiency.

In some embodiments, the auxiliary soldering point 105 may have a trapezoidal shape, as shown in 12 shown. The embodiment of the utility model does not specifically restrict the shape of the auxiliary soldering point, as long as it is ensured that the width of the auxiliary soldering point is greater than the width of the second metal contact.

In some exemplary embodiments, it is provided that the auxiliary soldering point 105 has a length L5 in the range of 0.05 mm ≤ L5 ≤ 1.5 mm along the second direction X, as in 12 shown. The length L5 is used to ensure the contact area between the second metal contact 120 and the auxiliary soldering point 105.

In some exemplary embodiments, it is provided that the overlap between the auxiliary soldering point 105 and the body section 121 has a length of L5, for which 0.05 mm ≤ L5 ≤ 1.5 mm applies. The length of the overlap between the auxiliary soldering point 105 and the body portion 121 is L5. Since the reinforcing contact 102 is also electrically in contact with the first metal contact 22, the length of the auxiliary soldering point 105 in the second direction X is equal to the length of the overlap of the auxiliary soldering point 105 and the body portion 121.

In some exemplary embodiments it is provided that the auxiliary soldering point 105 has a fifth width W5 along the first direction Y on a side facing away from the reinforcing contact 102 and the auxiliary soldering point 105 has a seventh width W7 along the first direction Y on a side that is in contact with the reinforcing contact 102 has, wherein the fifth width W5 is greater than the seventh width W7. When the second metal contact 120 is overprinted twice, the auxiliary soldering point 105 with a large fifth width W5 can ensure that the deviation range between every second metal contact 120 and the reinforcing contact 102 becomes larger, thereby improving the good part yield of the cell.

Further, the difference between the fifth width W5 and the seventh width W7 causes the auxiliary soldering point 105 to be used as a guide groove along the side surface of the first direction Y, thereby making the hidden surface of the auxiliary soldering point 105 is reduced while the success rate of alignment between the second metal contact 120 and the reinforcing contact 102 is improved.

In some embodiments, the fifth width W5 has a range of 0.02 mm ≤ W5 ≤ 1.5 mm. The fifth width range W5 can be 0.02 to 0.8mm, 0.18 to 1.39mm, 0.2 to 1.5mm, 0.9 to 1.48mm, 0.5 to 1mm, 0.6 to 1.3 mm or 0.09 to 0.8 mm. The fifth width W5 can be 0.06mm, 0.58mm, 0.77mm, 0.98mm, 1.19mm, 1.28mm, 1.33mm, 1.42mm or 1.5mm .

In some embodiments, the seventh width W7 has a range of 0.02 mm ≤ W7 ≤ 2 mm. The seventh width range W7 can be 0.02 to 1.122mm, 0.18 to 1.68mm, 0.2 to 1.97mm, 0.9 to 1.59mm, 0.5 to 1.105mm, 0, 6 to 1.38 mm or 0.09 to 0.94 mm. The seventh width W7 can be 0.06mm, 0.78mm, 1.22mm, 1.58mm, 1.67mm, 1.78mm, 1.87mm, 1.92mm or 2mm.

In some exemplary embodiments it is provided that N 12 ≤ N ≤ 30 applies. N is 12 to 16, 16 to 18, 18 to 20, 20 to 22, 22 to 24, 24 to 28 or 28 to 30. The number of reinforcement contacts 102 is equal to the number of solder tapes 40 for the subsequent soldering treatment.

In some embodiments, it is provided that the substrate 100 has a length of 180 to 220 mm along the first direction; where M within the same substrate is 100: 100 ≤ M ≤ 200; where the following applies to the number M3 of metal contacts of the first area 10: 100/X ≤ M3 ≤ 200/X.

In some embodiments, the length of the substrate 100 in the first direction is 180 to 189 mm, 189 to 193 mm, 193 to 201 mm, 201 to 211 mm, or 211 to 220 mm.

In some embodiments, M is 100 to 120, 120 to 140, 140 to 160, 160 to 180, or 180 to 200.

In some embodiments, the substrate 100 is provided with a front and a back that are arranged opposite each other; wherein the metal contact 21 comprises: a first number M1 of first contact fingers located on the front of the substrate 100, where M1 is: 100 ≤ M1 ≤ 180; a second number M2 of second contact fingers located on the back of the substrate 100, where M2 is greater than M1 and the following applies to M2: 150 ≤ M2 ≤ 200.

In some embodiments, M1 is 100 to 118, 118 to 139, 139 to 158, or 158 to 180. M2 is 150 to 168, 168 to 179, 179 to 188, or 188 to 200.

In some embodiments, the width of the first contact finger along the first direction Y is 10 to 45 μm. The width of the first contact finger can be 11 to 15 µm, 15 to 20 µm, 20 to 38 µm, 38 to 45 µm, 10 to 25 µm, 18 to 32 µm or 14 to 37 µm. The width of the first contact finger can be 10.3 µm, 16.8 µm, 21.7 µm, 33.6 µm, 35.8 µm, 41.1 µm, 42.3 µm or 45 µm.

In some embodiments, the width of the second contact finger along the first direction Y is 14 to 60 μm. The width of the second contact finger can be 15 to 20 µm, 20 to 28 µm, 28 to 35 µm, 35 to 49 µm, 49 to 52 µm, 52 to 60 µm or 18 to 39 µm. The width of the second contact finger can be 14.3 µm, 24.8 µm, 35.7 µm, 41.8 µm, 47.8 µm, 52.1 µm, 59.6 µm or 60 µm.

The width of the body section is 121 in 10 and 9 in the first direction Y equal to the width of the first metal contact 110 in 8th , so that the sixth width W6 is marked with the same reference numeral and the sixth width W6 can be the ninth width of the first contact finger or the tenth width of the second contact finger. In some embodiments, the width of the body portion 121 may be in 9 along the first direction Y from the width of the first metal contact 110 in 8th differentiate.

In some embodiments, the metal contact includes reference 14 further a third metal contact 130, which is located at the end of the substrate and is not in contact with the electrical connection line. The number of the third metal contact 130 can be 1 to 2, 2 to 4, 4 to 6, 1 to 6 or 2 to 4.

In the technical solution provided by the utility model, an electrical connection line is arranged at the end of the cell, and the electrical connection line is electrically connected with 2 to 12 metal contacts arranged close to the end of the substrate, or 2 to 12 metal contacts, which are arranged close to the intermediate region, so that the electrical connection line can increase the soldering area between the cell and the solder tape, and the electrical connection line can improve the soldering voltage between the cell and the solder tape, thereby improving the soldering effect between the cell and the solder tape becomes. The electrical connection line only connects a part of the metal contacts instead of all metal contacts, so that the ver Covered area of the surface of the substrate is small, thereby improving the cell efficiency of the solar cell. The electrical connection line is located at the end of the substrate, which can improve the current collecting ability of the substrate end, thereby improving cell efficiency.

In addition, a reinforcing contact is arranged in the solar cell, and the reinforcing contact can increase the soldering voltage between the metal contacts and the solder tape, thereby improving the soldering effect between the metal contacts and the solder tape. The electrical connection line is arranged in the solar cell, and the electrical connection line can collect the current of the contact finger near the end and the intermediate area of the cell, thereby avoiding the problem of damage caused by the solder tape at the end.

Accordingly, an embodiment of the utility model further provides a solar cell formed by dividing the solar cell provided by the first embodiment. A cell is divided into X cells along the position of the intermediate area, where X 2 ≤ X ≤ 10 applies; The same components as the above exemplary embodiments are not explained in more detail here. 15 shows another schematic structural representation of the solar cell according to an embodiment of the present utility model. The electrode is the same element as the metal contact, and the same reference number 21 is used here.

According to some embodiments of the utility model, another aspect of the embodiments of the utility model further provides a solar cell with X subcells, where X 2 ≤ X ≤ 10; It will be on 15 pointed out. The solar cell includes: a substrate 100; W electrodes arranged one behind the other in the first direction, each of the electrodes being on each of the substrates; 2N electrical connection lines, each of the electrical connection lines being electrically connected to H electrodes located close to one end of the substrate, where H is: 2 ≤ H ≤ 12; the width of the electrical connecting line being 8 to 60 µm along the direction of extension of the electrode; wherein along the first direction the length of the electrical connecting line is 2 to 50 mm.

In some embodiments, each electrode includes N+1 body portions and N separation portions; wherein the solar cell includes: a reinforcing contact, the reinforcing contact located in each of the separation portions and electrically in contact with the body portion; wherein along the first direction each of the electrical connection lines is immediately opposite each of the reinforcing contacts.

In some exemplary embodiments it is provided that N 12 ≤ N ≤ 30 applies.

In some embodiments it is provided that the substrate has a length of 180 to 220 mm along the first direction; where for W within the same substrate: 100/X ≤ W ≤ 200/X.

In one example,

Accordingly, another aspect of the embodiments of the utility model further provides a photovoltaic module according to some embodiments of the utility model, and the same components as the above embodiments are not explained in detail here.

16 shows a schematic structural representation of a photovoltaic module of an embodiment of the utility model; 17 shows a first schematic structural representation of a solder strip formed in the photovoltaic module of an exemplary embodiment of the utility model; 18 shows a second schematic structural representation of the solder strip formed in the photovoltaic module of an exemplary embodiment of the utility model.

It will be on 16 until 18 pointed out. The photovoltaic module comprises a cell string which is formed by a plurality of solar cells 50 electrically connected via a soldering tape 40 according to one of the above exemplary embodiments, the soldering tape 40 being electrically connected to each of the metal contacts 21, the soldering tape 40 being electrically in contact with the reinforcing contact 102 and the solder tape 40 is electrically in contact with the electrical connection line 101; an encapsulation layer 51 for covering a surface of the cell string; a cover plate 52 for covering a surface of the encapsulation layer 51 facing away from the cell string.

Specifically, in some exemplary embodiments, several cell strings can be electrically connected by a solder strip 40. 16 only schematically shows the positional relationship between the solar cells 50, that is, the electrodes with the same polarity of the solar cell 50 are arranged in the same direction, or the electrodes with the positive polarity of each cell are arranged on the same side, so that the conductive tape each connected to different sides of two adjacent cells. In some embodiments, the solar cell 50 may also be arranged such that electrodes of different polarities are directed toward the same side, that is, adjacent cells have first polarity, second polarity, and first polarity electrodes in sequence. Thus, the conductive tape is connected to two adjacent electrodes on the same side.

In some, the solar cells 50 are not spaced apart, that is, the solar cells 50 overlap.

In some embodiments, the encapsulation layer 51 includes a first encapsulation layer and a second encapsulation layer, where the first encapsulation layer covers either the front or the back of the solar cell 50, the second encapsulation layer covers the other of the front and back sides of the solar cell 50. Specifically, at least one of the first and second encapsulation layers can be an organic encapsulation film such as polyvinyl butyral (PVB), ethylene-vinyl acetate copolymer (EVA), polyolefin elastomer (POE) or polyethylene terephthalate (PET).

It is understood that the first encapsulation layer and the second encapsulation layer have a boundary line before lamination, and the formed photovoltaic module after lamination no longer has any first encapsulation layer or second encapsulation layer. The first encapsulation layer and the second encapsulation layer have then already formed an integral encapsulation layer 51.

In some embodiments, the cover plate 52 may be a cover plate with a light-transmitting function, such as a glass cover plate, a plastic cover plate, and the like. Specifically, the surface of the cover plate 52 facing the encapsulation layer 51 may be an uneven surface, thereby increasing the utilization rate of incident light. The cover plate 52 includes a first cover plate and a second cover plate, the first cover plate facing the first encapsulation layer and the second cover plate facing the second encapsulation layer.

One of ordinary skill in the art can understand that each of the above embodiments is a specific embodiment of the present utility model and various changes in form and detail may be made in practical application without departing from the spirit and scope of the utility model. Anyone skilled in the art can make various changes and modifications without departing from the spirit and scope of the utility model, so that the scope of the present utility model is subject to the scope defined by the claims.

Claims (28)

Solar cell, characterized in that it comprises the following: a substrate (100), wherein the substrate X comprises first regions (10), an intermediate region (20) being provided between every two of the first regions, where for X 2 ≤ applies; M metal contacts (21) arranged one behind the other in a first direction (Y), each of the metal contacts (21) being located on each of the first areas (10); K electrical connection lines (101), each of which is electrically connected to H metal contacts (21) located close to one end of the substrate or H metal contacts (21) located close to the intermediate region (20), where for H 2 ≤ H ≤ 12 applies; the width of the electrical connecting line (101) being in the range of 8 to 60 µm along the direction (X) of the metal contacts; wherein along the first direction (Y), the electrical connecting line (101) has a length range of 2 to 50 mm. Solar cell according to Claim 1 , characterized in that each of the metal contacts (21) comprises N + 1 body sections (121) and N separating sections (122); wherein the solar cell further comprises: a reinforcing contact (102), the reinforcing contact (102) being located in each of the separation portions (122) and being electrically in contact with the body portion (121); wherein along the first direction (Y), each of the electrical connection lines (101) is immediately opposite each of the reinforcing contacts (102); where K = X * 2N. Solar cell according to Claim 2 , characterized in that the reinforcing contact (102) has a length range of 0.015 to 0.6 mm along the first direction (Y) and the reinforcing contact (102) has a length range of 0.5 to 4.5 mm along the second direction (X ) having. Solar cell according to Claim 2 , characterized in that it further comprises: a passivation layer (103) located on the surface of the substrate (100). Solar cell according to Claim 2 , characterized in that for N 12 ≤ N ≤ 30 applies. Solar cell according to Claim 2 , characterized in that the reinforcing contact (102) comprises a first section (33) and a second section (32) extending along a second direction (X), the first section (33) being in contact with the body section (121 ) and the second section (32) is used for contact with a soldering tape (40). Solar cell according to Claim 6 , characterized in that a third width (W3) of an end of the first section (33) facing away from the second section (32) is greater than a fourth width (W4) of the contact surface between the first section (33) and the second section (32 ). Solar cell according to Claim 7 , characterized in that the third width (W3) has a range of 0.02 mm ≤ W3 ≤ 1.5 mm. Solar cell according to Claim 7 , characterized in that the fourth width (W4) has a range of 0.02 mm ≤ W4 ≤ 2 mm. Solar cell according to Claim 6 , characterized in that the length (L7) of the second section (32) is in the range of 0.01 mm ≤ L7 ≤ 1.5 mm. Solar cell according to Claim 6 , characterized in that the length (L8) of the first section (33) is in the range of 0.05 mm ≤ L8 ≤ 1.5 mm. Solar cell according to Claim 2 , characterized in that the length (L3) of the overlapping area between the reinforcing contact (102) and the body portion (121) in the second direction (X) is 0.05 to 1.5 mm. Solar cell according to Claim 2 , characterized in that the solar cell further comprises: an auxiliary soldering point (105) arranged on both sides of the reinforcing contact (102), a portion of the auxiliary soldering point (105) being in the second direction (X) with the body portion (121 ) overlaps and electrically contacts it. Solar cell according to Claim 13 , characterized in that the body portion (121) is in electrical contact with a part of the top of the auxiliary soldering point (105) along the thickness direction of the metal contact (21); alternatively, the body portion (121) is in electrical contact with a part of the bottom side of the auxiliary soldering point (105). Solar cell according to Claim 13 , characterized in that the width of the auxiliary soldering point (105) along the first direction (Y) is greater than the width of the body portion (121). Solar cell according to Claim 15 , characterized in that the auxiliary soldering point (105) has a fifth width (W5) along the first direction (Y) on a side facing away from the reinforcing contact (102) and the auxiliary soldering point (105) is in contact with the reinforcing contact (102). Page has a seventh width (W7) along the first direction (Y), wherein the fifth width (W5) is greater than the seventh width (W7). Solar cell according to Claim 16 , characterized in that for the area of the fifth width (W5) 0.02 mm ≤ W5 ≤ 1.5 mm applies. Solar cell according to Claim 16 , characterized in that for the area of the seventh width (W7) 0.02 mm ≤ W7 ≤ 2 mm applies. Solar cell according to Claim 13 , characterized in that the auxiliary soldering point (105) has a length (L5) in the range of 0.05 mm ≤ L5 ≤ 1.5 mm along the second direction (X). Solar cell according to Claim 13 , characterized in that the overlap between the auxiliary soldering point (105) and the body portion (121) has a length of L5 in the second direction (X), for which 0.05 mm ≤ L5 ≤ 1.5 mm applies. Solar cell according to Claim 1 , characterized in that the substrate (100) has a length of 180 to 220 mm along the first direction (Y); where for M within the same substrate (100) the following applies: 100 ≤ M ≤ 200; whereby the following applies to the number M3 of metal contacts (21) of the first area (10): 100/X ≤ M3 ≤ 200/X. Solar cell after Claim 1 , characterized in that the substrate (100) has a front and a back arranged oppositely; wherein the metal contact (21) comprises: a first number M1 of first contact fingers located on the front of the substrate (100), where M1 is: 100 ≤ M1 ≤ 180; a second number M2 of second contact fingers located on the back of the substrate (100), where M2 is greater than M1 and the following applies to M2: 150 ≤ M2 ≤ 200. Solar cell according to Claim 22 , characterized in that the first contact finger has a width range of 10 to 17 µm along the first direction (Y); where along the first Direction (Y) the width of the second contact finger is 14 to 20 µm. Solar cell with X sub-cells, characterized in that for X 2 ≤ X ≤ 10; wherein the solar cell comprises: a substrate (100); W electrodes arranged one behind the other in a first direction, each of the electrodes being on each of the substrates (100); 2N electrical connection lines, each of the electrical connection lines being electrically connected to H electrodes located close to one end of the substrate, where H is: 2 ≤ H ≤ 12; the width of the electrical connecting line being 8 to 60 µm along the direction of extension of the electrode; wherein along the first direction the length of the electrical connecting line is 2 to 50 mm. Solar cell according to Claim 24 , characterized in that each of the electrodes comprises N + 1 body sections and N separation sections; wherein the solar cell further comprises: a reinforcing contact located in each of the separation portions and electrically in contact with the body portion; wherein along the first direction each of the electrical connection lines is immediately opposite each of the reinforcing contacts. Solar cells according to Claim 25 , characterized in that for N 12 ≤ N ≤ 30 applies. Solar cell according to Claim 25 , characterized in that the substrate has a length of 180 to 220 mm along the first direction; where W within the same substrate is: 100/X ≤ W ≤ 200/X. Photovoltaic module, characterized in that it comprises: a cell string consisting of a plurality of solar cells (50) electrically connected via a solder tape (40) according to one of Claims 1 until 23 is formed, wherein the soldering strip (40) is electrically connected to each of the metal contacts (21), the soldering strip (40) being electrically in contact with the reinforcing contact (102) and the soldering strip (40) being electrically in contact with the electrical connecting line (101). is in contact; an encapsulation layer (51) for covering a surface of the cell string; a cover plate (52) for covering a surface of the encapsulation layer (51) facing away from the cell strand.

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