Photovoltaic module

Abstract

The present disclosure relates to a photovoltaic module having a length direction and a width direction perpendicular to each other, the photovoltaic module comprising two battery cells and a plurality of bypass diodes. The two battery units are arranged along the width direction, each battery unit comprises a plurality of battery string groups, the plurality of battery string groups are arranged in parallel along the length direction, the plurality of battery string groups are sequentially connected in series, each battery string group comprises at least one battery string, each battery string comprises at least two battery pieces, and the at least two battery pieces are arranged along the width direction and are connected in series. Each battery string group is reversely connected in parallel with the corresponding bypass diode, and the two battery string groups connected in parallel with the same bypass diode are symmetrically arranged. According to the photovoltaic module, the specification is met, the number of the battery pieces connected with the bypass diode in parallel is reduced, the temperature when hot spots occur is reduced, and the safety risk caused by the hot spot phenomenon is reduced.

Description

Technical Field

[0001] The present disclosure relates to the technical field of solar energy industry, and in particular to photovoltaic modules. Background Art

[0002] During the operation of solar photovoltaic modules, if a shadow blocks one or some solar cells, the output of other cells connected in series with the shadowed cell will be consumed by the cell. This energy consumption will cause local breakdown of the cell semiconductor structure and cause local overheating, which is the hot spot effect. In order to prevent solar photovoltaic modules from being damaged by the hot spot effect, the usual solution is to add bypass diodes to the original circuit.

[0003] When the light is not blocked, each diode is in reverse bias and each cell is generating electricity. When a cell is blocked, it stops generating electricity and becomes a high-resistance resistor. At the same time, other cells cause it to be reverse biased, causing the diodes connecting the two ends of the cell to conduct, and the current that originally flowed through the blocked cell is shunted by the diode. Since the heating temperature of the hot spot is related to the corresponding total bypass power, that is, when the power of a single cell is the same, the more cells corresponding to the bypass diode, the higher the temperature generated by the hot spot when a hot spot occurs.

[0004] Since the width of PV panels is limited by the height of logistics containers, increasing the power of PV panels can only be achieved by increasing the number of cells in a single string along the length direction. However, an increase in the number of cells in a single string will lead to an increase in the number of cells corresponding to the bypass diode, causing the hot spot temperature to rise. Utility Model Content

[0005] The disclosed embodiment provides a photovoltaic module, which has a length direction and a width direction perpendicular to each other, and the photovoltaic module includes two battery cells and a plurality of bypass diodes. The two battery cells are arranged in the width direction, each battery cell includes a plurality of battery string groups, the plurality of battery string groups are arranged in parallel in the length direction, the plurality of battery string groups are connected in series in sequence, each battery string group includes at least one battery string, each battery string includes at least two battery cells, and the at least two battery cells are arranged in the width direction and connected in series. Each battery string group is reversely connected in parallel to the corresponding bypass diode, and the two battery string groups connected in parallel to the same bypass diode are symmetrically arranged.

[0006] The two battery cells in the photovoltaic module provided by the embodiment of the present disclosure are symmetrically arranged along the width direction, which facilitates the design of the circuit of the entire photovoltaic module. The battery cells are arranged in the width direction and connected in series, so the number of battery strings arranged in the length direction increases, and the number of battery cells in each battery string group along the width direction decreases, which not only meets the length and width specifications of the photovoltaic module, but also reduces the number of battery cells connected in parallel to a bypass diode, reduces the temperature when hot spots occur, and reduces the safety risks caused by hot spot phenomena.

[0007] In some embodiments, the battery cell is a half-cut battery. The battery unit also includes a plurality of connecting ribbons, and the battery cells are connected in series through the connecting ribbons.

[0008] The half-cut cells are convenient for parallel connection to the two cell strings of the same bypass diode, and are symmetrically arranged. The cells are connected in series in the width direction through the connecting welding strips, which reduces the deformation of the photovoltaic module in the length direction, effectively reduces the stress of the connecting welding strips on the cells in the length direction, reduces the risk of hidden cracks in the cells, and improves the load performance of the photovoltaic module.

[0009] In some of these embodiments, the number of battery strings along the length direction ranges from four to sixteen.

[0010] With such an arrangement, different numbers of battery strings of different sizes can be used according to the power requirements of the photovoltaic module.

[0011] In some of the embodiments, the battery unit includes an even number of battery strings, the battery string group includes two battery strings connected in series, and a bypass diode is connected in parallel to the two symmetrically arranged battery string groups.

[0012] With this configuration, the number of cells on the photovoltaic module is greater on the same or similar size version, the number of bypass diodes connected in parallel increases, and the risk of hot spots is reduced. At the same time, the number of cells connected in parallel to a bypass diode is smaller, the temperature rise caused by hot spots will also be lower, and the power loss of the entire photovoltaic module will also be reduced when the bypass diode is activated in the event of a hot spot.

[0013] In some of the embodiments, the battery unit includes an odd number of battery strings, the battery unit also includes a jumper, the jumper is connected in series with two adjacent battery strings, one battery string group includes a jumper and a battery string adjacent to the jumper, and the remaining battery string groups include two battery strings connected in series.

[0014] With this arrangement, the jumper can be connected in series with a battery string and then connected in parallel with the bypass diode, so that the photovoltaic module as a whole can still use an even number of strings. On the same or similar size version, the luminous efficiency of the photovoltaic module is guaranteed, the risk of hot spots is reduced, and the power loss of the entire photovoltaic module is also reduced when the bypass diode is activated in the event of a hot spot. At the same time, the circuit connection method of the entire photovoltaic module is simple.

[0015] In some embodiments, the battery unit includes fourteen battery strings, each battery string includes five battery cells connected in series, the battery unit includes three first battery string groups and one second battery string group connected in series, the first battery string group includes four battery strings connected in series, and the second battery string group includes two battery strings connected in series.

[0016] With such an arrangement, on the same or similar sized versions, the number of cells on the photovoltaic module is greater, and the total number of cells after the bypass diodes are connected in parallel to four strings of cells is less than the total number of cells after the vertical bypass diodes are connected in parallel to two strings of cells, which not only reduces the high temperature risk caused by hot spots, but also reduces the power loss of the entire photovoltaic module when the bypass diodes are started.

[0017] In some of the embodiments, the battery unit further includes a plurality of jumpers, the number of the jumpers is the same as the number of the battery strings, the battery string group includes a battery string and a jumper, and the battery string is connected to the jumper.

[0018] With this arrangement, each battery is connected in series with a bypass diode, and each bypass diode corresponds to the least number of battery cells, which minimizes the risk of high temperature when hot spots occur, and minimizes the power loss of the entire photovoltaic module when the bypass diode is started.

[0019] In some of the embodiments, a plurality of intermediate welding strips are further included, two battery strings arranged symmetrically along the width direction are connected in parallel to one intermediate welding strip, each bypass diode is connected to a corresponding intermediate welding strip, and a plurality of intermediate welding strips are connected in series along the length direction.

[0020] With this arrangement, the middle welding strip is used for connection between multiple battery strings, and at the same time facilitates parallel connection between two battery cells and the design of the connection circuit of the bypass diode.

[0021] In some embodiments, the photovoltaic module further comprises a front glass plate, a front adhesive film, a back adhesive film and a back glass plate, wherein the back glass plate, the back adhesive film, two battery cells, the front adhesive film and the front glass plate are stacked in sequence along a height direction, and the height direction is perpendicular to the length direction and perpendicular to the width direction;

[0022] The photovoltaic module is in the shape of a cuboid, with a dimension range of 1500 mm to 2500 mm along the length direction and a dimension range of 900 mm to 1400 mm along the width direction.

[0023] With such a setting, in the same size version, the photovoltaic module meets the specifications compared with the vertical arrangement, reduces the high temperature risk when hot spots occur, reduces the power loss of the entire photovoltaic module when the bypass diode is started, reduces the deformation of the photovoltaic module along the length direction, reduces the risk of hidden cracks in the battery cell, and improves the load performance of the photovoltaic module.

[0024] In some embodiments, the photovoltaic module also includes two cables and multiple junction boxes, the number of junction boxes is the same as the number of bypass diodes, the bypass diodes are accommodated in one-to-one corresponding junction boxes, the multiple junction boxes are arranged along the length direction, the multiple junction boxes are connected to the back glass plate, and the two cables are respectively connected to the junction boxes at both ends.

[0025] With such arrangement, the junction box facilitates the installation of the bypass diode and the connection of the lines in the photovoltaic module, and the junction box realizes the output of current through the cables at both ends. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A schematic diagram of the photovoltaic module circuit connection and the current direction when the circuit is working normally in the embodiment of the present disclosure;

[0027] Figure 2 A schematic diagram of the photovoltaic module circuit connection and the current direction when a hot spot occurs in an embodiment of the present disclosure;

[0028] Figure 3 is a circuit connection diagram when the number of battery strings of the photovoltaic module in the embodiment of the present disclosure is even;

[0029] Figure 4 is a circuit connection diagram when the number of battery strings of the photovoltaic module in the embodiment of the present disclosure is odd;

[0030] Figure 5 It is a schematic diagram of the circuit connection mode of the vertical version of a conventional photovoltaic module in the comparative example;

[0031] Figure 6 A schematic diagram of a circuit connection method of a photovoltaic module in an embodiment of the present disclosure;

[0032] Figure 7 It is a circuit connection diagram when a battery string of a photovoltaic module in an embodiment of the present disclosure is connected to a jumper wire;

[0033] Figure 8 is a cross-sectional view of a photovoltaic module in an embodiment of the present disclosure;

[0034] Fig. 9 is a top view of a photovoltaic assembly in an embodiment of the present disclosure;

[0035] Fig.10 It is a bottom view of the photovoltaic assembly in the embodiment of the present disclosure.

[0036] Reference numerals:

[0037] 100. Photovoltaic module; 1. Battery cell; 11. Battery string group; 111. Battery string; 1111. Battery cell; 101. First battery string group; 102. Second battery string group; 12. Connecting welding ribbon; 13. Jumper wire; 2. Bypass diode; 3. Middle welding ribbon; 4. Front glass plate; 5. Positive adhesive film; 6. Back adhesive film; 7. Back glass plate; 8. Junction box; 9. Cable. DETAILED DESCRIPTION

[0038] In order to make the above-mentioned purposes, features and advantages of the embodiments of the present disclosure more obvious and understandable, the specific implementation of the embodiments of the present disclosure is described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the embodiments of the present disclosure. However, the embodiments of the present disclosure can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the embodiments of the present disclosure, so the embodiments of the present disclosure are not limited by the specific embodiments disclosed below.

[0039] In the description of the embodiments of the present disclosure, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "perpendicular", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present disclosure and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present disclosure.

[0040] In the embodiments of the present disclosure, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0041] In addition, the terms "first", "second", "third", etc. are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. Exemplarily, the first battery string group may also be referred to as the second battery string group, and the second battery string group may also be referred to as the first battery string group. In the description of the present utility model, "multiple" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0042] In the embodiments of the present disclosure, unless otherwise clearly specified and limited, the terms "connected", "connection", and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a flexible connection, or a rigid connection along at least one direction; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or directly connected with the presence of an intermediate medium, or it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly limited. The terms "installed", "fixed", and the like can be broadly understood as connection. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to the specific circumstances.

[0043] With the vigorous development of the photovoltaic industry, the application scenarios of photovoltaics have gradually increased, and the safety performance requirements of photovoltaic modules have become higher and higher. With the iteration of technology, the size of cells and modules has gradually increased, and the safety hazards caused by the hot spot effect of photovoltaic modules have become higher and higher. Photovoltaic modules can effectively reduce the harm caused by hot spots in modules through bypass diodes. Since the width of photovoltaic modules is limited by the height of logistics containers, photovoltaic modules usually adopt a vertical six-row design, which is the maximum transportable width. A bypass diode is connected in parallel every two rows. Therefore, increasing the power of photovoltaic modules can only be achieved by increasing the number of batteries in a single string along the length direction. However, the increase in the number of batteries in a single string will lead to an increase in the number of batteries corresponding to the bypass diode, which will increase the temperature of the hot spot.

[0044] like Figure 1 As shown, Figure 1 FIG. 1 shows the circuit connection of the photovoltaic assembly 100 in the embodiment of the present disclosure and the current direction when the circuit is working normally. Figure 2 As shown, Figure 2 The circuit connection of the photovoltaic assembly 100 in the embodiment of the present disclosure and the current direction when a hot spot occurs are shown. The present disclosure relates to the technical field of the solar energy industry.

[0045] refer to Figure 1 to Figure 2The embodiment of the present disclosure provides a photovoltaic module 100. The photovoltaic module 100 has a length direction and a width direction that are perpendicular to each other. Exemplarily, the length direction is the left-right direction. The width direction is the up-down direction.

[0046] The photovoltaic assembly 100 includes two battery cells 1 and a plurality of bypass diodes 2. The two battery cells 1 are arranged along the width direction. Exemplarily, the two battery cells 1 are symmetrically arranged along the up-down direction.

[0047] Each battery unit 1 includes a plurality of battery string groups 11. The plurality of battery string groups 11 are arranged in parallel along the length direction. The plurality of battery string groups 11 are sequentially connected in series. Exemplarily, the plurality of battery string groups 11 are arranged in parallel along the left-right direction. The plurality of battery string groups 11 are sequentially connected in series along the left-right direction.

[0048] Each battery string group 11 includes at least one battery string 111. Exemplarily, each battery string group 11 includes one battery string 111, two battery strings 111 connected in series, or three battery strings 111 connected in series. Exemplarily, the current direction of the first battery string 111 on the left is from top to bottom, the current direction of the second battery string 111 on the left is from bottom to top, and the current direction of the third battery string 111 on the left is from top to bottom.

[0049] Each battery string 111 includes at least two battery cells 1111. At least two battery cells 1111 are arranged in the width direction and connected in series. Exemplarily, each battery string 111 includes two battery cells 1111, three battery cells 1111, or five battery cells 1111 connected in series in the up-down direction. Exemplarily, the current direction of the battery cells 1111 of the first battery string 111 on the left is from top to bottom.

[0050] Each battery string group 11 is reversely connected in parallel to the corresponding bypass diode 2. The two battery strings 11 connected in parallel to the same bypass diode 2 are symmetrically arranged. Exemplarily, the bypass diode 2 is located between the upper and lower symmetrical battery strings 11. A bypass diode 2 is reversely connected in parallel to the upper battery string group 11 and reversely connected in parallel to the lower battery string group 11.

[0051] refer to Figure 1 , Figure 2 and Figure 6, the diode connected in the up-down direction represents the battery cell 1111, and the current direction outside the battery cell 1111 is opposite to the current direction of the diode. The diode connected in the left-right direction is a bypass diode 2. The photovoltaic module 100 provided in the embodiment of the present disclosure has a positive pole on the left and a negative pole on the right, and symmetrically arranged battery units 1 in the up-down direction. A plurality of battery string groups 11 are connected in parallel in the left-right direction, and each battery string group 11 includes two battery strings 111 connected in series in the left-right direction. Each battery string 11 includes six battery cells 1111 connected in series in the up-down direction. Each bypass diode 2 is reversely connected in parallel to the corresponding battery string group 11 arranged in the upper and lower directions, and a plurality of bypass diodes 2 are connected in series in the left-right direction. When the battery cell 1111 is not blocked, the current of the upper and lower battery units 1 flows through the battery string group 11 connected in series from right to left, respectively, and the bypass diode 2 is not turned on. After that, the upper and lower battery units 1 are connected in parallel and output current from the left. When the battery cell 1111 of one of the battery string groups 11 is blocked, such as Figure 2 The black rectangular box in the figure indicates that the battery string group 11 generates a hot spot phenomenon and stops generating electricity, becoming a high-resistance resistor. Therefore, the bypass diode 2 connected in parallel with the battery string group 11 is turned on, so that the current continues to flow into the next battery string group 11 connected in series after passing through the bypass diode 2, and no current flows through the battery string group 11 where the blocked battery cell 1111 is located. At this time, the twelve battery cells 1111 included in the battery string group 11 are far less than the twenty-two battery cells 1111 included in each battery string group 11 corresponding to the vertical arrangement. The fewer the number of battery cells 1111 corresponding to the bypass diode 2, the lower the temperature generated by the hot spot when a hot spot occurs, and the corresponding power loss of the entire photovoltaic module 100 is also reduced when the bypass diode 2 is started.

[0052] The two battery cells 1 in the photovoltaic module 100 provided in the embodiment of the present disclosure are symmetrically arranged along the width direction, which facilitates the circuit design of the entire photovoltaic module 100. The photovoltaic module 100 not only meets the specifications in the length direction and the width direction, but also reduces the number of battery cells 1111 connected in parallel to a bypass diode 2, reduces the temperature when hot spots occur, and reduces the safety risks caused by hot spot phenomena.

[0053] In some of the embodiments, the two battery cells 1 are axially symmetrically distributed along the vertical direction. Exemplarily, the distances between the two battery cells 1 and the axis of symmetry are the same. Exemplarily, the number of battery string groups 11 included in the upper battery cell 1 is the same as the number of battery string groups 11 included in the lower battery cell 1. Exemplarily, the upper and lower corresponding battery string groups 11 are not misaligned along the left and right directions. Exemplarily, the distance intervals between two adjacent battery strings 111 arranged horizontally are also the same. The upper and lower alignment of the battery cells 1 facilitates the design distribution of the entire circuit of the photovoltaic module 100, reduces the confusion of the circuit layout, and the operation is simple when a bypass diode 2 is connected in parallel with the corresponding two battery string groups 11.

[0054] refer to Figure 1 and Figure 2 , the dimension of the photovoltaic assembly 100 along the length direction is L, the dimension of the photovoltaic assembly 100 along the width direction is W, and L is greater than W. Exemplarily, W is fixed and the length of L can be changed. Figure 1 and Figure 2 A plurality of battery strings 111 are omitted from the middle portion of each battery unit 1 .

[0055] In some embodiments, the battery cell 1111 is a half-cut battery, which is convenient for symmetrical arrangement of two battery strings 11 connected in parallel with the same bypass diode 2 .

[0056] Exemplarily, a half-sliced ​​battery of the upper battery cell 1 and a half-sliced ​​battery of the lower battery cell 1 can be assembled into a complete battery cell 1111 .

[0057] refer to Figures 1 to 3 In some embodiments, the battery unit 1 further includes a plurality of connecting ribbons 12, and the battery cells 1111 are connected in series through the connecting ribbons 12. The battery cells 1111 are connected in series in the width direction through the connecting ribbons 12, which reduces the deformation of the photovoltaic module 100 along the length direction, effectively reduces the stress of the connecting ribbons 12 on the battery cells 1111 in the length direction, reduces the risk of hidden cracks of the battery cells 1111, and improves the load performance of the photovoltaic module 100.

[0058] refer to Figure 1 and Figure 2 For example, each battery string 111 is connected in series via a connecting welding strip 12 along the length direction, and the connecting welding strip 12 along the length direction is respectively located at the edge portions of the two battery cells 1 .

[0059] In some embodiments, the number of battery strings 111 along the length direction ranges from four to sixteen.

[0060] With such configuration, different numbers of battery strings 111 of different sizes can be used according to the power requirements of the photovoltaic assembly 100 .

[0061] Exemplarily, the number of battery strings 111 arranged in parallel in the left-right direction may be four, six, ten, eleven, twelve or fourteen.

[0062] refer to Figure 3 In some embodiments, the battery unit 1 includes an even number of battery strings 111 , the battery string group 11 includes two battery strings 111 connected in series, and a bypass diode 2 is connected in parallel to the two symmetrically arranged battery string groups 11 .

[0063] With such a configuration, on a version of the same or similar size, the number of cells 1111 on the photovoltaic module 100 is greater, the number of bypass diodes 2 connected in parallel increases, and the risk of hot spots is reduced. At the same time, the number of cells 1111 connected in parallel to a bypass diode 2 is smaller, the temperature rise caused by hot spots will also be lower, and the power loss of the entire photovoltaic module 100 will also be reduced when the bypass diode 2 is activated in the event of a hot spot.

[0064] Exemplarily, six battery cells 1111 are connected in series in the up-down direction to form a battery string 111, twelve battery strings 111 are arranged in the left-right direction, every two battery strings 111 are connected in series to form a battery string group 11, and a total of six battery string groups 11 are formed. The six battery string groups 11 are connected in series in sequence to form a battery cell 1, and six bypass diodes 2 are connected in series in the left-right direction and arranged between two symmetrical battery cells 1, and each bypass diode 2 is reverse-parallel connected to two battery string groups 11 corresponding to the up-down direction.

[0065] Exemplarily, six battery cells 1111 are connected in series in the up-down direction to form a battery string 111, fourteen battery strings 111 are arranged in the left-right direction, every two battery strings 111 are connected in series to form a battery string group 11, and seven battery string groups 11 are formed in total. The seven battery string groups 11 are connected in series in sequence to form a battery cell 1, and seven bypass diodes 2 are connected in series in the left-right direction and arranged between two symmetrical battery cells 1, and each bypass diode 2 is reverse-parallel connected to two battery string groups 11 corresponding to the up-down direction.

[0066] refer to Figure 4 In some embodiments, the battery cell 1 includes an odd number of battery strings 111, and the battery cell 1 also includes a jumper 13, the jumper 13 is connected in series with two adjacent battery strings 111, a battery string group 11 includes a jumper 13 and a battery string 111 adjacent to the jumper 13, and the remaining battery string groups 11 include two battery strings 111 connected in series.

[0067] In this configuration, the jumper 13 can be connected in series with a battery string 111 and then connected in parallel with the bypass diode 2, so that the photovoltaic module 100 as a whole can still use an even number string design, and on the same size or similar size version, the luminous efficiency of the photovoltaic module 100 is guaranteed, the risk of hot spots is reduced, and the power loss of the entire photovoltaic module 100 is also reduced when the bypass diode 2 is activated when a hot spot occurs. At the same time, the circuit connection method of the entire photovoltaic module 100 is simple.

[0068] Exemplarily, six battery cells 1111 are sequentially connected in series in the up-down direction to form a battery string 111, and eleven battery strings 111 are arranged in the left-right direction. From left to right, the jumper 13 is located between the sixth battery string 111 and the seventh battery string 111. The sixth battery string 111, the jumper 13 and the seventh battery string 111 are sequentially connected in series. The seventh battery string 111 and the jumper 13 form a battery string group 11. The remaining two battery strings 111 are connected in series to form a battery string group 11, forming a total of six battery string groups 11. The six battery string groups 11 are sequentially connected in series to form a battery unit 1. Six bypass diodes 2 are sequentially connected in series in the left-right direction and are arranged between two symmetrical battery units 1. Each bypass diode 2 is reversely connected in parallel with two battery string groups 11 correspondingly arranged in the up-down direction. In other embodiments, the jumper 13 can be located between the first battery string 111 and the second battery string 111, and the jumper 13 is connected in series with the first battery string 111 to form a battery string group 11. The jumper 13 may be located between any two battery strings 111 and form a battery string group 11 with one of the battery strings 111 , so that the remaining battery strings 111 can be connected in series in pairs to form a battery string group 11 .

[0069] refer to Figure 5 , the length direction of the conventional vertical photovoltaic module is the up-down direction, and the width direction is the left-right direction. Eleven cells are connected in series along the length direction to form a battery string, and six battery strings are arranged along the width direction. Every two battery strings are connected in series to form a battery string group, forming a total of three battery string groups. Three battery string groups are connected in series in sequence to form a battery unit. Three bypass diodes are connected in series in sequence along the width direction and arranged in the middle of two symmetrical battery units. Each bypass diode is reversely connected in parallel with the two battery string groups corresponding to the length direction. The photovoltaic module includes two battery units with a total of 132 cells. Each battery unit includes 66 cells. Each bypass diode corresponds to a battery string group including 22 cells. When a battery cell is blocked, the bypass diode is activated, and the power loss of the photovoltaic module is one-sixth.

[0070] refer to Figure 6 In some embodiments, the battery unit 1 includes fourteen battery strings 111, each battery string 111 includes five battery cells 1111 connected in series, the battery unit 1 includes three first battery string groups 101 and one second battery string group 102 connected in series, the first battery string group 101 includes four battery strings 111 connected in series, and the second battery string group 102 includes two battery strings 111 connected in series. The photovoltaic module 100 includes two battery units 1 with a total of one hundred and forty battery cells 1111, the first battery string group 101 includes twenty battery cells 1111, and the second battery string group 102 includes ten battery cells 1111.

[0071] With such a configuration, the number of cells 1111 on the photovoltaic module 100 is greater than the number of cells 1111 arranged in a vertical layout on a layout of the same or similar size. The total number of cells 1111 after the bypass diode 2 is connected in parallel to the first battery string group 101 is 9% less than the total number of cells 1111 of the vertical layout bypass diode 2 connected in parallel to two strings, and the power loss of the entire photovoltaic module 100 when the bypass diode 2 connected in parallel to the first battery string group 101 is started is one-eighth, which is less than the power loss of the vertical layout. The total number of cells 1111 after the bypass diode 2 is connected in parallel to the second battery string group 102 is 54% less than the total number of cells 1111 of the vertical layout bypass diode 2 connected in parallel to two strings, and the power loss of the entire photovoltaic module 100 when the bypass diode 2 connected in parallel to the second battery string group 102 is started is one-fourteenth, which is less than the power loss of the vertical layout. The photovoltaic assembly 100 of the present disclosure not only reduces the high temperature risk caused by hot spots, but also reduces the power loss of the entire photovoltaic assembly 100 when the bypass diode 2 is started.

[0072] refer to Figure 7 In some embodiments, the battery unit 1 further includes a plurality of jumpers 13 , the number of the jumpers 13 is the same as the number of the battery strings 111 , the battery string group 11 includes a battery string 111 and a jumper 13 , and the battery string 111 is connected to the jumper 13 .

[0073] With this arrangement, each battery string 111 is connected in parallel with a bypass diode 2, and the number of battery cells 1111 corresponding to each bypass diode 2 is minimal, thereby minimizing the high temperature risk when hot spots occur, and minimizing the power loss of the entire photovoltaic module 100 when the bypass diode 2 is started.

[0074] Exemplarily, the battery unit 1 includes four battery strings 111 and four jumpers 13. One battery string 111 and one jumper 13 form a battery string group 11, forming four battery string groups 11 in total, and four bypass diodes 2 in total. One bypass diode 2 is connected in parallel to two battery strings 11 symmetrically arranged in the battery unit 1, respectively.

[0075] In other embodiments, the number of jumpers 13 of the battery unit 1 ranges from two to the number of battery strings 111. Exemplarily, the battery unit 1 includes ten battery strings 111 and four battery string groups 11, four jumpers 13 respectively form four battery string groups 11 with four battery strings 111, and the remaining six battery strings 111 form one battery string group 11 in pairs.

[0076] refer to Figures 1 to 4 , Figure 6 and Figure 7In some embodiments, a plurality of intermediate welding strips 3 are further included, two battery string groups 11 arranged symmetrically along the width direction are connected in parallel to one intermediate welding strip 3, each bypass diode 2 is connected to the corresponding intermediate welding strip 3, and a plurality of intermediate welding strips 3 are connected in series along the length direction.

[0077] With such arrangement, the middle welding strip 3 is used for connection between multiple battery strings 11 , and is convenient for parallel connection between two battery units 1 , and is also convenient for designing the connection circuit of the bypass diode 2 .

[0078] Exemplarily, each bypass diode 2 is connected to the middle position of each middle welding strip 3 .

[0079] refer to Figure 8 and Fig. 9 In some embodiments, the photovoltaic module 100 further includes a front glass plate 4, a positive adhesive film 5, a back adhesive film 6 and a back glass plate 7. The back glass plate 7, the back adhesive film 6, the two battery cells 1, the positive adhesive film 5 and the front glass plate 4 are stacked in sequence along the height direction, and the height direction is perpendicular to the length direction and perpendicular to the width direction.

[0080] In some embodiments, the photovoltaic component 100 is in the shape of a cuboid, and the size of the photovoltaic component 100 along the length direction ranges from 1500 mm to 2500 mm, and the size of the photovoltaic component along the width direction ranges from 900 mm to 1400 mm.

[0081] Exemplarily, the dimension of the photovoltaic module 100 along the length direction is 2382 mm, and the dimension of the photovoltaic module 100 along the width direction is 1134 mm. Exemplarily, the dimension of the battery cell 1111 along the length direction is 210 mm, and the dimension of the battery cell 1111 along the width direction is 182 mm. The battery unit 1 includes five battery cells 1111 connected in series in the up-down direction and ten battery strings 111 arranged in the left-right direction, and the photovoltaic module 100 includes two battery units 1 arranged in the up-down direction.

[0082] With such an arrangement, in the same size version, compared with the vertical arrangement, the photovoltaic module 100 reduces the high temperature risk when hot spots occur, reduces the power loss of the entire photovoltaic module 100 when the bypass diode 2 is started, reduces the deformation of the photovoltaic module 100 along the length direction, reduces the risk of hidden cracks in the battery cell 1111, and improves the load performance of the photovoltaic module 100 while meeting the specifications.

[0083] refer to Fig.10In some embodiments, the photovoltaic module 100 further includes two cables 9 and a plurality of junction boxes 8, the number of the junction boxes 8 is the same as the number of the bypass diodes 2, the bypass diodes 2 are accommodated in the corresponding junction boxes 8, the plurality of junction boxes 8 are arranged along the length direction, the plurality of junction boxes 8 are connected to the back glass plate 7, and the two cables 9 are respectively connected to the junction boxes 8 at both ends.

[0084] With such arrangement, the junction box 8 facilitates the installation of the bypass diode 2 and the connection of the circuits in the photovoltaic assembly 100 , and the junction box 8 realizes the output of current through the cables 9 at both ends.

[0085] For example, there are five bypass diodes 2 and five junction boxes 8, which are arranged at intervals in the left-right direction. One bypass diode 2 is correspondingly accommodated in one junction box 8. The leftmost junction box 8 is connected to one cable 9, and the rightmost junction box 8 is connected to another cable 9.

[0086] The technical features of the embodiments disclosed above can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the embodiments described above are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0087] The above disclosed embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the patent scope of the utility model. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A photovoltaic module, characterized in that The photovoltaic module has a length direction and a width direction that are perpendicular to each other, and comprises: Two battery cells, the two battery cells are arranged along the width direction, each of the battery cells includes a plurality of battery string groups, the plurality of battery string groups are arranged in parallel along the length direction, the plurality of battery string groups are connected in series in sequence, each of the battery string groups includes at least one battery string, each of the battery string includes at least two battery cells, the at least two battery cells are arranged along the width direction and connected in series; and A plurality of bypass diodes, each battery string group is reversely connected in parallel to a corresponding bypass diode, and the two battery string groups connected in parallel to the same bypass diode are symmetrically arranged.

2. The photovoltaic module according to claim 1, characterized in that: The battery cell is a half-cut battery; The battery unit further includes a plurality of connecting welding strips, and the battery cells are connected in series via the connecting welding strips.

3. The photovoltaic module according to claim 1, characterized in that: Along the length direction, the number of the battery strings ranges from four to sixteen.

4. The photovoltaic module according to claim 1, characterized in that: The battery unit includes an even number of battery strings, the battery string group includes two battery strings connected in series, and one bypass diode is connected in parallel to the two symmetrically arranged battery string groups.

5. The photovoltaic module according to claim 1, characterized in that: The battery unit includes an odd number of battery strings, and the battery unit also includes a jumper, which is connected in series with two adjacent battery strings. One battery string group includes one jumper and one battery string adjacent to the jumper, and the remaining battery string groups include two battery strings connected in series.

6. The photovoltaic module according to claim 1, characterized in that: The battery unit includes fourteen battery strings, each of which includes five battery cells connected in series. The battery unit includes three first battery string groups and one second battery string group connected in series. The first battery string group includes four battery strings connected in series, and the second battery string group includes two battery strings connected in series.

7. The photovoltaic module according to claim 1, characterized in that: The battery unit further includes a plurality of jumpers, the number of the jumpers is the same as the number of the battery strings, the battery string group includes one battery string and one jumper, and the battery string is connected to the jumper.

8. The photovoltaic module according to any one of claims 1 to 7, characterized in that: It also includes a plurality of middle welding strips, two battery string groups arranged symmetrically along the width direction are connected in parallel to one middle welding strip, each bypass diode is connected to a corresponding middle welding strip, and the plurality of middle welding strips are connected in series along the length direction.

9. The photovoltaic module according to claim 1, characterized in that: It also includes a front glass plate, a positive adhesive film, a back adhesive film and a back glass plate, wherein the back glass plate, the back adhesive film, the two battery cells, the positive adhesive film and the front glass plate are sequentially stacked along a height direction, and the height direction is perpendicular to the length direction and perpendicular to the width direction; The photovoltaic component is in the shape of a cuboid, the size of the photovoltaic component along the length direction ranges from 1500 mm to 2500 mm, and the size of the photovoltaic component along the width direction ranges from 900 mm to 1400 mm.

10. The photovoltaic module according to claim 9, characterized in that: It also includes two cables and multiple junction boxes, the number of the junction boxes is the same as the number of the bypass diodes, the bypass diodes are accommodated in the junction boxes corresponding to each other, the multiple junction boxes are arranged along the length direction, the multiple junction boxes are connected to the back glass plate, and the two cables are respectively connected to the junction boxes at both ends.

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