Photovoltaic module and methods for its manufacture

Abstract

A photovoltaic module comprises a first electrical connection (10) and a second electrical connection (20), between which a current conductor (50) is formed. The photovoltaic module also comprises a plurality of cell string blocks (100; 101, 102, 103, 104), each cell string block (100; 101, 102, 103, 104) having several parallel-connected solar cell strings (110), and each of the solar cell strings (110) having several solar cells (120) connected in series with respect to the current conductor (50). The plurality of cell string blocks (100) has a first cell string block (101) and a second cell string block (102) connected in parallel with respect to the current conductor (50).

Description

The present invention relates to a photovoltaic module, a method for its manufacture and in particular to a photovoltaic module with short solar cell strings with an optimized series resistance and low copper consumption. BACKGROUND German patent application DE 10 2021 131977 A1 describes a conventional photovoltaic module comprising a first module segment with a first sub-segment and a second sub-segment. The first and second sub-segments each contain at least one solar cell string, and each solar cell string contains a plurality of solar cells connected in series via a sub-segment connector. The first module segment has two bypass elements. The photovoltaic module also has a second module segment. At least one segment connector for series or parallel connection of the module segments is arranged between the first and second module segments. The module segments are arranged, in particular, side by side in a longitudinal arrangement perpendicular to the orientation of the solar cell strings. A junction box is located at one edge of the solar module.Disadvantages of the photovoltaic module include resistance losses, particularly in the segment connectors, which are especially high for low-voltage modules used in solar park applications, as well as the aforementioned junction boxes that must be positioned at the edge of the module. CN 109 515 682 U discloses a conventional shingle-based photovoltaic module and WO 2021 / 051929 A1 discloses a conventional cut photovoltaic module. While other conventional photovoltaic modules reduce resistance losses, they also experience very high voltages due to the serial connection of many solar cells. There is a need for a compromise that avoids high voltages while simultaneously enabling the highest possible current with low series resistance. Novel interconnections should allow the use of shorter cells (e.g., half-cells, third-cells, quarter-cells, or even shorter cells) while avoiding excessively high voltages per bypass element and achieving the desired high current yield. In particular, the number of solar cells per string should be kept as low as possible. However, this is not strictly necessary. Brief description of the invention At least some of the problems mentioned above are solved by a photovoltaic module according to claim 1 and a method for manufacturing the photovoltaic module according to claim 12. The dependent claims relate to advantageous embodiments of the subject matter of the independent claims. The present invention relates to a photovoltaic module comprising: a first electrical connection, a second electrical connection, and a plurality of cell string blocks. A current conductor is formed between the first electrical connection and the second electrical connection, for example, to conduct away the generated current. Each cell string block of the plurality of cell string blocks comprises several parallel-connected solar cell strings. Each of the solar cell strings comprises several solar cells connected in series with respect to the current conductor. The plurality of cell string blocks has at least one first cell string block and one second cell string block connected in parallel with respect to the current conductor. The current routing can include a variety of conductors or connection elements to achieve the desired configuration and conduct the generated current during operation. The current routing will therefore comprise a multitude of current paths between the first and second electrical connections. The first and second electrical connections can serve to electrically connect the photovoltaic module. Appropriate connection leads can be provided there for this purpose. Optionally, the array of cell string blocks includes a third cell string block connected in series with the first cell string block for current flow, and a fourth cell string block connected in series with the second cell string block for current flow. The third and fourth cell string blocks can ultimately be connected in parallel. Optionally, further cell string blocks can be formed, which can be arranged or connected in parallel to the first cell string block and / or in parallel to the second cell string block. Likewise, additional cell string blocks can be arranged or connected in series with the first cell string block and / or the second cell string block. Advantageously, if cell string blocks are connected in series, an equal number of parallel cell string blocks are also added to these series-connected cell string blocks. The power supply features string connectors, each of which electrically connects the ends of multiple solar cell strings. The string connectors can be configured to achieve the desired connection (series or parallel). The string connectors can connect solar cell strings from a single cell string block or from multiple cell string blocks. Optionally, the first electrical connection and / or the second electrical connection each connect to one of the string connectors at a predetermined position. This predetermined position along the respective string connector can be at least one of the following: an endpoint, a midpoint, or an intermediate position between two solar cell strings. The endpoint offers the advantage of minimizing the number of junction boxes (e.g., only one). The midpoint offers the advantage of optimized current distribution. The intermediate position, while representing a compromise, is easier to manufacture (and therefore less expensive). According to further embodiments, the string connectors comprise several sections that can be electrically connected to one another. Optionally, the cell connectors can also be continuous, with contact only at different positions (e.g., via soldered connections). Therefore, the current path can include further string connectors, each arranged only along a fraction of the connection path between the ends of the solar cell strings. Optionally, the photovoltaic module further includes at least one bypass element, which is arranged or connected in parallel to at least one of the cell string blocks. The bypass element serves to protect the solar cells in the event of shading, as shading can lead to high voltage drops, which are short-circuited by the bypass element(s). The photovoltaic module includes at least one bypass supply line for electrically contacting the at least one bypass element. The bypass supply line is routed or laid on a rear side. Within the scope of this disclosure, the front of the photovoltaic module is the side that faces the direction of incident light during operation. The rear side is the opposite side, which is shaded during operation. According to further embodiments, a (low) degree of irradiance could also be expected on the rear side of bifacial modules. The string connectors have a larger cross-section than the bypass leads. The bypass leads only carry current when shaded; otherwise, they are de-energized. For example, string connectors between two connected cell string blocks can have a cross-section of 3 x 0.35 mm², 6 x 0.35 mm², or 9 x 0.35 mm², or within ranges of + / - 20% or + / - 50%. At the connection point of the first electrical terminal and / or the second electrical terminal, the cross-section of the string connectors can be 4 x 0.35 mm² or 8 x 0.35 mm², or within ranges of + / - 20% or + / - 50%. Optionally, the photovoltaic module further includes at least one junction box for electrically connecting the photovoltaic module. This junction box can have at least one of the following: - one or more or all bypass elements, - the first electrical connection, - the second electrical connection, - power electronics for converting the generated electrical current. Optionally, at least one junction box includes one of the following: - three junction boxes, one of which includes all bypass elements and the other two junction boxes each have an electrical connection, - two junction boxes each with a bypass element and each with one of the electrical connections, - (only) one junction box with all bypass elements and with the first electrical connection and the second electrical connection. Optionally, the photovoltaic module has a long side and a short side. The solar cell strings can be arranged parallel to the long side. Optionally, the photovoltaic module can be configured as follows: The first and second cell string blocks are arranged one above the other along their long sides. Adjacent to these, the third and fourth cell string blocks are arranged one above the other along their long sides. A first bypass element can be arranged between the first and second cell string blocks to bridge (short-circuit) them in case of shading. A second bypass element can be arranged between the third and fourth cell string blocks to bridge (short-circuit) them in case of shading. If, as mentioned, the first and second cell string blocks are connected in parallel, the first bypass element will, according to the exemplary embodiments, connect the two ends of the parallel first and second cell string blocks.Short-circuit if necessary. The second bypass element will accordingly connect the two ends of the parallel-connected third and fourth cell string blocks, or short-circuit them if necessary. According to exemplary embodiments, the bypass elements each bridge only one of the serially connected cell string blocks (but possibly several parallel-connected cell string blocks). Therefore, the electrical connection between the first and third cell string blocks can itself be electrically connected to the electrical connection between the second and fourth cell string blocks, but this is not necessary. Alternatively or additionally, a separate bypass element could be implemented for each individual cell string block, so that the ends of each individual cell string block can always be short-circuited if necessary. Optionally, the solar cells of the photovoltaic module can be full cells, half cells, third cells, quarter cells, fifth cells, sixth cells, or a combination thereof. For example, with a tolerance of + / - 50%, the photovoltaic module can have 60 full cells, 120 half cells, or 240 quarter cells, which are interconnected as described in the exemplary embodiments. Optionally, each cell string block comprises a predetermined number of solar cell strings, where the predetermined number can be, for example, 2, 3, 4, 5, ... Exemplary embodiments refer to a method for manufacturing a photovoltaic module as described in this disclosure. Examples of this technology overcome the disadvantages of conventional modules through an optimized arrangement and interconnection of shorter solar cells (smaller than, for example, half-cells), where the resistance (and thus the cross-section) of the cell connectors as well as the module voltages can be kept low. This also allows for material savings (e.g., copper). Despite this, high currents are still possible. BRIEF DESCRIPTION OF THE FIGURES The embodiments of the present invention are better understood from the following detailed description and the accompanying drawings, which, however, should not be interpreted as limiting the disclosure to the specific embodiments, but merely as serving for explanation and understanding. Fig. 1 shows an equivalent circuit diagram for a photovoltaic module according to embodiments of the present invention. Fig. 2 shows a photovoltaic module with the plurality of cell string blocks as they can be arranged according to embodiments. Fig. 3 shows a photovoltaic module with a further contact option according to embodiments. Fig. 4 shows a photovoltaic module with yet another contact option according to embodiments. Fig. 5 shows a photovoltaic module with yet another contact option according to embodiments. DETAILED DESCRIPTION Fig. 1 shows a schematic representation of an equivalent circuit diagram for a photovoltaic module, as it can be formed according to exemplary embodiments. The photovoltaic module comprises a first electrical connection 10 and a second electrical connection 20, between which a current conductor 50 is formed. The photovoltaic module further comprises a plurality of cell string blocks 100. Each cell string block 100 comprises several parallel-connected solar cell strings 110. Each of the solar cell strings 110 comprises several solar cells 120 connected in series with respect to the current conductor 50. The plurality of cell string blocks 100 comprises at least two cell string blocks 100 connected in parallel with respect to the current conductor 50. It is understood that the terms "switched" or "interconnected" refer to the electrical circuit or the corresponding equivalent circuit diagram, and not necessarily to the geometric or physical arrangement. A series connection of components therefore implies a common current flow through the connected components, whereas in a parallel connection, the current flows are divided. In contrast, the term "arranged" can, in some embodiments, refer to and restrict the geometric or physical arrangement. However, this is not necessarily the case. In the illustrated embodiment, the current conductor 50 comprises a respective current path through each of the parallel-connected solar cell strings 110. The parallel connection limits the voltage, since the number of series-connected solar cells 120 is limited, while simultaneously allowing high currents to be generated, which are distributed across the many parallel current paths through the solar cell strings 110. This need for a special module design for high currents is particularly important for smaller solar cells or those divided into multiple sections. According to the examples given, the solar cells are full cells, half cells, third cells, quarter cells, etc., or a combination thereof. The solar cells 120 in the solar cell strings 110 are interconnected by cell connectors (e.g., wires). According to exemplary embodiments, the cell connectors can have a wire diameter of less than 280 µm, preferably less than 250 µm, and even more preferably 200 µm. According to exemplary embodiments, the photovoltaic module further comprises a bypass element 200 (e.g., a diode) arranged in parallel to the cell string blocks 100. In the event of shading or partial shading of the photovoltaic module, the voltage drop increases, and the bypass element 200 bridges all cell string blocks 100 (at the breakdown voltage) to prevent overvoltage damage or thermal overload. In the illustrated embodiment, the plurality of cell string blocks 100 comprises only a first cell string block 100 and a second cell string block 100, which are connected in parallel with respect to the current flow 50. It is understood, however, that according to further embodiments, additional cell string blocks 100 can be arranged in parallel to the cell string blocks shown and / or in series with them. Fig. 2 shows an embodiment of the photovoltaic module with four cell string blocks 100. The plurality of cell string blocks 100 therefore comprises a first cell string block 101 and a second cell string block 102, which are connected in parallel with respect to the current flow 50. The plurality of cell string blocks 100 further comprises a third cell string block 103, which is connected in series with respect to the current flow 50 to the first cell string block 101, and a fourth cell string block 104, which is connected in series with respect to the current flow 50 to the second cell string block 102. The photovoltaic module has the first electrical connection 10 between the first cell string block 101 and the second cell string block 102. Accordingly, the second electrical connection 20 is located between the third cell string block 103 and the fourth cell string block 104. Each of the cell string blocks 101, 102, 103, 104 shown comprises, by way of example, three solar cell strings 110, which are contacted along the current path 50 from the first electrical connection 10 to the second electrical connection 20 (or vice versa) from both sides by string connectors 150. The string connectors 150 each connect the ends of several solar cell strings 110 together. For example, a first string connector 150a connects the first terminal 10 to the solar cell strings 110 of the first cell string block 101. From an opposite side of the first cell string block 101, a second string connector 150b connects the solar cell strings 110 of the first cell string block 101 to one end of the solar cell strings 110 of the third cell string block 103. From an opposite side of the third cell string block 103, a third string connector 150c connects the solar cell strings 110 of the third cell string block 103 to the second terminal 20. Furthermore, the first string connector 150a connects the first terminal 10 to the solar cell strings 110 of the second cell string block 102. From an opposite side of the second cell string block 102, a fourth string connector 150d connects the solar cell strings 110 of the second cell string block 102 to one end of the solar cell strings 110 of the fourth cell string block 104. From an opposite side of the fourth cell string block 104, the third string connector 150c connects the solar cell strings 110 of the fourth cell string block 104 to the second terminal 20. For example, the photovoltaic module can have a long side and a short side. According to exemplary embodiments, the solar cell strings 110 are then arranged parallel to the long side. The first cell string block 101 and the second cell string block 102 are, for example, arranged one above the other along the long side. Adjacent to them, the third cell string block 103 and the fourth cell string block 104 are arranged one above the other along the long side. According to the illustrated embodiment, a first bypass element 201 is connected in parallel to both the first cell string block 101 and the second cell string block 102. This first bypass element 201 is, for example, arranged between the first cell string block 101 and the second cell string block 102 and provides a bypass for both the first and second cell string blocks 102 in the event of shading. Furthermore, a second bypass element 202 is connected in parallel to both the third cell string block 103 and the fourth cell string block 104. This second bypass element 202 is arranged between the third cell string block 103 and the fourth cell string block 104 and provides a bypass for both the third and fourth cell string blocks 103 and 104 in the event of shading. The photovoltaic module has bypass leads 250 for connecting the bypass elements 201 and 202. A first bypass lead 250a connects the first bypass element 201 to the second string connector 150b, and a second bypass lead 250b connects the second bypass element 202 to the fourth string connector 150d. The other end of each bypass element 201 or 202 can be directly connected to the first string connector 150a or the third string connector 150c, respectively. Thus, all four cell string blocks 101, 102, 103, and 104 can be bridged with just two bypass elements 201 and 202. Furthermore, both bypass leads 250a and 250b can be connected to each other. Optionally, the bypass leads 250a and 250b can be routed on the back side of the photovoltaic module. In this case, the bypass leads 250a and 250b can be made very thin, for example, with a cross-section of approximately 10 x 0.05 mm². The back side is, for example, the side facing away from the light. String connectors 150 and bypass leads 250 can therefore be routed on different levels of the photovoltaic module. According to exemplary embodiments, these connectors can fulfill further tasks such as fixing or gluing (to prevent the strings / string blocks from slipping towards each other) or be designed to reflect light in order to redirect the light falling on them back into the cell. Since the bypass leads 250 are only current-carrying in the event of overvoltage (e.g., during shading), they can have a smaller cross-section compared to the string connectors 150. Because these leads extend along the long side of the photovoltaic module, significant material savings can be achieved. In contrast, the string connectors 150 extend along the short side of the photovoltaic module, thus limiting the larger cross-sectional area required due to the current and consequently reducing material consumption. According to the illustrated embodiment, the photovoltaic module comprises (only) a junction box 300 for electrically connecting the photovoltaic module. The junction box 300 has the bypass elements 201, 202 and the first connection 10 and the second connection 20. The first connection 10 is electrically connected, for example, by means of a first connection cable 410, and the second connection 20, for example, by means of a second connection cable 420. For this purpose, the first bypass element 201 and the second bypass element 202 are advantageously arranged with a small distance between them so that both can be accommodated in the common junction box 300. According to exemplary embodiments, both connecting cables 410, 420 can be connected in the middle so that the box can be kept small. Exemplary embodiments achieve this by positioning the bypass elements 201, 202 at an endpoint of the first string connector 150a or the third string connector 150c, specifically at the endpoint where the first string connector 150a and the third string connector 150c have a minimum distance. Similarly, the first electrical connection 10 and / or the second electrical connection 20 can each be coupled to the respective string connector 150a, 150c at a predetermined position. The predetermined position can again be the endpoint where the string connectors 150a, 150c have only the minimum distance between them, so that both connections together with the bypass elements 201, 202 can be accommodated in the common junction box 300. A particular advantage of the embodiment of Fig. 2 is therefore that only one junction box 300 is required. The embodiment shown in Fig. 2 can be summarized as follows: - the strings 110 comprise solar cells 120 connected in series, - the string connectors 150 span three adjacent strings 110, - the bypass supply line 250 (cell connectors that do not carry current in unshaded operation) do not contribute to the electrical resistance and can have a smaller copper cross-section, - a central junction box 300 can have both exemplary bypass diodes 201, 202 and the two cable connections 10, 20. Fig. 3 shows a photovoltaic module with an additional contact option for the bypass elements 200 or the first and second connections 10, 20, as can be configured according to further embodiments. In the embodiment shown, the arrangement of the cell string blocks 101, 102, 103, 104 and their solar cell strings 110 is chosen in the same way as already described with reference to Fig. 2. A repetition of the description is therefore not necessary. As already explained, the first electrical connection 10 can be connected to the first string connector 150a at a predetermined position. Alternatively or additionally, the second electrical connection 20 can be connected to the third string connector 150c at a predetermined position. In the embodiment shown in Fig. 3, the predetermined position is set at an intermediate position P between two of the solar cell strings 110 (e.g., between the two solar cell strings 110 arranged centrally in the module). The same intermediate position P can be selected for both string connectors 150a and 150c. However, the intermediate positions P can also be chosen differently. According to the exemplary embodiments, the bypass elements 201, 202 also couple to this intermediate position P. This is not mandatory, but offers advantages in manufacturing. The other side of the bypass elements 201, 202 in turn couples to the first and second bypass supply lines 250a, 250b (see description of Fig. 2). According to exemplary embodiments, the first string connector 150a and / or the third string connector 150c can also have several sections, each arranged only along a fraction of the lateral extent of the respective cell string blocks 100. According to further exemplary embodiments, the string connectors 150 can also be formed in one piece and only have contacts (e.g., solder contacts) at the predetermined position. Accordingly, the photovoltaic module according to the embodiment shown in Fig. 3 comprises two junction boxes 300: a first junction box 301 with the first bypass element 201 and the first electrical connection 10, and a second junction box 302 with the second bypass element 202 and the second electrical connection 20. The first junction box 301 can be arranged at the intermediate position P of the first string connector 150a, and the second junction box 302 can be arranged at the intermediate position P of the third string connector 150c. The use of an intermediate position P causes the current paths to split or branch at this intermediate position. This reduces the current load at the first and third string connectors 150a, 150c. A particular advantage of the embodiment shown in Fig. 3 is therefore that the current density through the string connectors 150 can be limited, since the electric current to / from the electrical terminals 10, 20 can be distributed on both sides. According to the exemplary embodiments, the respective intermediate position P can also be a midpoint or center point of the respective string connector 150a, 150c. This would further enhance the aforementioned advantage, as the current would then be optimally distributed. The embodiment shown in Fig. 3 can be summarized as follows: - the strings 110 comprise solar cells 120 connected in series, - the bypass supply line (cell connectors that do not carry current in unshaded operation) does not contribute to the electrical resistance and can have a smaller material cross-section (e.g., copper, aluminum, or other materials), - two junction boxes 301, 302, each with an exemplary bypass diode 201, 202 and each with a cable connection 10, 20, are provided, - one component of the string connectors 150 can pass over two adjacent strings 110, - another component of the string connectors 150 can pass over only one string 110. Fig. 4 shows a photovoltaic module with an additional contact option for the bypass elements 200 or the first and second connections 10, 20, as can be configured according to further embodiments. In the embodiment shown, the arrangement of the cell string blocks 101, 102, 103, 104 and their solar cell strings 110 is chosen in the same way as already described with reference to Fig. 2. A repetition of the description is therefore not necessary. The embodiment shown differs from the embodiment of Fig. 3 only in that the bypass elements 200 are arranged as described with Fig. 2 (i.e., at an end position), while the first electrical connection 10 and second electrical connection 20 are configured as described with Fig. 3 (i.e., an intermediate position P or center position). Accordingly, the photovoltaic module according to this embodiment comprises three junction boxes: a first junction box 301 for the first electrical connection 10, a second junction box 302 for the second electrical connection 20, and a third junction box 303 for both bypass elements 201 and 202. The embodiment of Fig. 4 therefore combines the advantages of the other embodiments, i.e. the current distribution to / from the electrical terminals 10, 20 is optimized, while all bypass elements 200 are arranged in one place in a manufacturing-optimized manner. The embodiment shown in Fig. 4 can be summarized as follows: - the strings 110 comprise solar cells 120 connected in series, - the cell connectors (or string connectors 150) extend over three adjacent strings 110 or fewer, as in Fig. 3, - the bypass leads (cell connectors that do not carry current in unshaded operation) do not contribute to the electrical resistance and can have a smaller copper cross-section, - three junction boxes 301, 302, 303 are provided: a central box 303 with two exemplary bypass diodes and two further boxes 302, 303 each with a cable connection 10, 20. Fig. 5 shows a photovoltaic module with an additional contact option for the bypass elements 200 or the first and second connections 10, 20, as can be configured according to further embodiments. In the embodiment shown, the arrangement of the cell string blocks 101, 102, 103, 104 and their solar cell strings 110 is chosen in the same way as already described with reference to Fig. 2. A repetition of the description is therefore not necessary. The embodiment shown differs from the previous embodiments only in that a separate bypass element 200 is provided for each individual cell string block 100, so that the ends of each individual cell string block 100 can always be short-circuited if necessary. Thus, a first bypass element 201 is connected in parallel to the first cell string block 101, a second bypass element 202 is connected in parallel to the second cell string block 102, a third bypass element 203 is connected in parallel to the third cell string block 103, and a fourth bypass element 204 is connected in parallel to the fourth cell string block 104. Accordingly, the first bypass supply line 250a is not connected to the second bypass supply line 250b, but only contacts the corresponding bypass elements 200. Advantageous aspects of exemplary embodiments can be summarized as follows: Compared to conventional photovoltaic modules, these embodiments generate a reduced voltage while achieving a higher current. The increased current yield is achieved through parallel connection, while simultaneously keeping the solar cell string 110 short to prevent high voltages, and limiting the number of cells connected in series per bypass element 200. Significantly little or no additional material is required for the connectors 150 and 250. Likewise, no dead zones are created in the photovoltaic module, and resistance losses are kept to a minimum. For example, connectors (bypass leads 250) that run parallel to the connected solar cell strings 110 carry no current, or only when the system is switched off. Exemplary embodiments allow for electrical connection via a central junction box 300, which includes bypass elements 200 (such as diodes). However, it is also possible to use two or three junction boxes 301, 302, 303 to further reduce the series resistance (optimize current distribution). According to exemplary embodiments, the current is conducted in unshaded operation via two parallel semicircles. An advantage of these embodiments is that, in unshaded operation, the current is only conducted twice through three adjacent strings each time (in the case of one junction box) or once through one string 110, once through two strings 110, and only once through three adjacent strings each time (in the case of multiple junction boxes). The current is not conducted in a complete circuit within the module. The power loss in the string connectors 150 can be limited to 3.3 watts (with central connection box 300) or 2 watts when using 2 boxes for quarter cells, depending on the wafer format, according to the embodiments. A further advantage of these embodiments is that the use of a central junction box 300 offers cost and reliability benefits, since only one glass opening is required in the photovoltaic module and the single junction box 300 can accommodate both or all of the bypass elements 200. Furthermore, two separate junction boxes 301, 302 could also be located in an edge region of the photovoltaic module without requiring a special edge design. The features of the invention disclosed in the description, claims and figures may be essential for the realization of the invention, either individually or in any combination. REFERENCE MARK LIST 10 First electrical connection 20 Second electrical connection 50 Current conductor 100 Cell string blocks 101 First cell string block 102 Second cell string block 103 Third cell string block 104 Fourth cell string block 110 Solar cell strings 120 Solar cells 150 String connectors 200 Bypass elements (e.g., diodes) 250 Bypass lead 300, 301, 302, ... Junction box(es) 410 First electrical connection lead 420 Second electrical connection lead P Intermediate position (for contacting)

Claims

Photovoltaic module comprising: a first electrical connection (10) and a second electrical connection (20), between which a current conductor (50) is formed; a plurality of cell string blocks (100; 101, 102, 103, 104), wherein each cell string block (100; 101, 102, 103, 104) has several parallel-connected solar cell strings (110) and each of the solar cell strings (110) has several solar cells (120) connected in series with respect to the current conductor (50); at least one bypass element (200) connected in parallel to at least one of the cell string blocks (100);and one or more bypass leads (250) for electrically contacting the at least one bypass element (200), wherein the bypass lead (250) is guided on a rear side and the rear side is a side facing away from light, and wherein the plurality of cell string blocks (100) comprises at least one first cell string block (101) and at least one second cell string block (102) which are connected in parallel with respect to the current guide (50), wherein the current guide (50) comprises string connectors (150) which each connect ends of several solar cell strings (110) from one cell string block (100) or from several cell string blocks (101, 103), wherein the string connectors (150) have a larger cross-section than the bypass leads (250). Photovoltaic module according to claim 1, wherein the plurality of cell string blocks further comprises: a third cell string block (103) which is connected in series with respect to the current flow to the first cell string block (101); and a fourth cell string block (104) which is connected in series with respect to the current flow to the second cell string block (102). Photovoltaic module according to claim 1 or claim 2, wherein at least one of the string connectors (150) has multiple components. Photovoltaic module according to one of claims 1 to 3, wherein the first electrical connection (10) and / or the second electrical connection (20) each couples to one of the string connectors (150) at a predetermined position and the predetermined position is at least one of the following: an endpoint, a midpoint, an intermediate position (P) between two of the adjacent solar cell strings (110). Photovoltaic module according to one of claims 1 to 4, which further comprises at least one junction box (300) for electrically contacting the photovoltaic module and which comprises at least one of the following: - one or more bypass elements (200), - the first electrical connection (10), - the second electrical connection (20), - power electronics for converting the generated electrical current. Photovoltaic module according to claim 5, wherein the at least one junction box comprises one of the following: - three junction boxes (301, 302, 303), one of which (303) comprises all bypass elements and the other two (301, 302) each comprise one of the electrical connections (10, 20), - two junction boxes (301, 302) each with one bypass element (200) and each with one of the electrical connections (10, 20), or - only one junction box (300) with all bypass elements (200) and with the first electrical connection (10) and the second electrical connection (20). Photovoltaic module according to one of claims 1 to 6, wherein the photovoltaic module has a long side and a short side and the solar cell strings (110) are arranged parallel to the long side. Photovoltaic module according to claim 7, insofar as it relates back to claim 2, wherein the first cell string block (101) and the second cell string block (102) are arranged one above the other along the long side and, to the side of them, the third cell string block (103) and the fourth cell string block (104) are arranged one above the other along the long side, and wherein a first bypass element (201) is arranged between the first cell string block (101) and the second cell string block (102) and bridges the first cell string block (101) and the second cell string block (102) when shaded, and wherein a second bypass element (202) is arranged between the third cell string block (103) and the fourth cell string block (104) and bridges the third cell string block (103) and the fourth cell string block (104) when shaded. Photovoltaic module according to any one of claims 1 to 8, wherein the solar cells comprise one or more of the following cells: full cells, half cells, third cells, quarter cells, fifth cells, sixth cells, a combination thereof. Photovoltaic module according to one of claims 1 to 9, wherein each cell string block (100) has a predetermined number of solar cell strings (110) and the predetermined number is a number from the following: 2, 3, 4, 5, 6. Method for manufacturing a photovoltaic module according to claim 1.

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