Lightweight photovoltaic module and photovoltaic power generation equipment
By optimizing the cell structure of photovoltaic modules through group welding and flexible connections, the problem of easy breakage of solder joints was solved, and stable operation was achieved in bending and complex environments, thereby improving the reliability and fault tolerance of the modules.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- DAS SOLAR CO LTD
- Filing Date
- 2025-04-25
- Publication Date
- 2026-04-28
AI Technical Summary
Existing photovoltaic modules are prone to weld breakage during the welding process, which can lead to circuit interruption of the entire cell string. The welding method also causes stress concentration when bending, which limits the application scenarios and reliability of lightweight photovoltaic modules.
A group welding strategy is adopted, using flexible welding strips for parallel connection within groups and series connection between groups. Combined with busbars and conductive plates, the connection structure of the battery cells is optimized, the welding strip length is shortened, and the fault tolerance is enhanced.
It improves the stability and reliability of photovoltaic modules in bending and complex environments, reduces the risk of solder strip breakage, and ensures the continuous operation of modules in the event of local failure.
Smart Images
Figure CN224178523U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of photovoltaic module technology, and in particular to a lightweight photovoltaic module and photovoltaic power generation equipment. Background Technology
[0002] Lightweight photovoltaic (PV) modules are particularly suitable for specialized applications such as flexible buildings and vehicle-mounted PV systems. In flexible buildings, building structures may lack the robust load-bearing capacity required for traditional PV module installations. Lightweight PV modules, with their portability, can be easily installed on building surfaces, generating electricity without placing excessive strain on the building structure. In vehicle-mounted PV applications, where space and weight are strictly limited, lightweight PV modules not only reduce the load on the vehicle but can also be flexibly installed in different locations, providing clean energy to the vehicle.
[0003] Under current technological conditions, linear soldering is commonly used to connect individual solar cells in a photovoltaic module through series connection. However, this soldering method has some significant problems. The solder joints formed by linear soldering are single-point contacts. If a contact failure occurs at any of these solder joints, it's like a critical node in a circuit breaking, easily causing an interruption of the entire series circuit. This means that if the connection between a single solar cell and the solder strip fails, the entire circuit composed of series-connected solar cells will malfunction, leading to a significant decrease in the photovoltaic module's power generation efficiency, or even complete failure.
[0004] Furthermore, this welding method exhibits significant disadvantages when photovoltaic modules are subjected to bending forces. When a photovoltaic module bends, the solder strip is subjected to substantial stress, which concentrates in certain areas. As the bending curvature increases, the stress on the solder strip also increases dramatically, leading to an exponential increase in the solder strip breakage rate. This high breakage rate not only increases the failure risk of the photovoltaic module but also limits the application scenarios for lightweight photovoltaic modules. For example, in applications requiring significant bending or deformation of photovoltaic modules, lightweight photovoltaic modules may fail to function properly due to the susceptibility of the solder strip to breakage, thus affecting normal user operation and restricting the promotion and application of lightweight photovoltaic modules in more fields. Utility Model Content
[0005] In view of this, the purpose of this utility model is to overcome the shortcomings in related technologies, and this utility model provides a lightweight photovoltaic module and photovoltaic power generation equipment.
[0006] This utility model provides the following technical solution:
[0007] A lightweight photovoltaic module includes solar cells, flexible solder strips, conductive plates, and busbars.
[0008] The battery cells are arranged in multiple sequences along a first direction; the multiple battery cells arranged along the first direction form a group; the battery cells are arranged in multiple groups along a second direction, which is perpendicular to the first direction; the flexible solder strip is sequentially welded to the first electrode of each battery cell arranged along the first direction; the conductive plate is sequentially welded to the second electrode of each battery cell arranged along the first direction; the busbar has multiple segments, each segment of the busbar is correspondingly disposed between two adjacent groups of battery cells, one end of the busbar is connected to the flexible solder strip of one group of battery cells, and the other end of the busbar is connected to the conductive plate of another group of battery cells, so as to connect the groups of battery cells in series.
[0009] As a further improvement to the above technical solution, the flexible welding strip is provided with a first corrugated segment corresponding to the battery cell, and the first corrugated segment is located at the gap between adjacent battery cells arranged along the first direction.
[0010] As a further improvement to the above technical solution, the length of the first corrugated segment is greater than the gap between two adjacent battery cells.
[0011] As a further improvement to the above technical solution, each group of battery cells has multiple flexible solder strips arranged along the second direction.
[0012] As a further improvement to the above technical solution, a second corrugated section is provided between the busbar, the flexible solder strip, and the conductive plate, respectively. The second corrugated section between the busbar and the flexible solder strip is arranged along the first direction, and the second corrugated section between the busbar and the conductive plate is arranged along the second direction.
[0013] As a further improvement to the above technical solution, the conductive plate is a copper plate, and the copper plate is evenly distributed with mesh holes.
[0014] As a further improvement to the above technical solution, the lightweight photovoltaic module also includes a front panel and a back panel, wherein the front panel is made of a transparent material and the solar cells are located between the front panel and the back panel.
[0015] As a further improvement to the above technical solution, an adhesive layer is provided between the front panel and the battery cell and between the back panel and the battery cell. The adhesive layer is composed of an adhesive colloid and is used to bond the front panel and the back panel to the battery cell respectively.
[0016] As a further improvement to the above technical solution, a waterproof layer is provided on the end face of the back panel facing away from the battery cell.
[0017] This utility model also provides a photovoltaic power generation device, including a lightweight photovoltaic module as described in any one of the above-mentioned methods.
[0018] Compared with related technologies, the beneficial effects of this utility model are:
[0019] The lightweight photovoltaic module provided by this utility model has optimized the cell connection method and structural layout, significantly improving its reliability and stability in practical applications. Specifically, the module achieves performance improvement through the following technical solutions:
[0020] First, the conductive plate is welded to the second electrode of each group of solar cells to ensure electrical continuity within each group. Then, flexible solder ribbons are used to sequentially weld the first electrodes of each group of solar cells, creating a parallel structure within each group. Finally, busbars are used to connect the groups of solar cells in series, forming a complete photovoltaic module circuit.
[0021] By dividing the solar cells into multiple independent groups and using flexible solder ribbons for parallel connection within groups and series connection between groups, this invention significantly shortens the length of each flexible solder ribbon compared to the traditional design where a single solder ribbon runs through all solar cells. This design improvement is particularly important in applications where photovoltaic modules need to bend or adapt to a certain curvature. Due to the shortened length of the flexible solder ribbon, the stress concentration effect during bending is effectively alleviated, thereby significantly reducing the risk of ribbon breakage and improving the overall reliability of the module.
[0022] More importantly, the group welding design of this invention also gives the module higher fault tolerance. In extreme cases, even if the flexible solder strip on a group of cells breaks due to external force or environmental factors, it will only cause the circuit of some cells in that group to be disconnected, without affecting the normal operation of other groups of cells. Since the groups of cells are connected in series through busbars, a local failure in a single group will not cause the circuit of the entire module to be interrupted, thus ensuring the continuous and stable operation of this invention in complex environments.
[0023] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description
[0024] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.
[0025] Figure 1 An exploded view of the lightweight photovoltaic module in one embodiment of the present invention is shown.
[0026] Figure 2 This diagram shows a schematic view of the lightweight photovoltaic module in one embodiment of the present invention.
[0027] Figure 3 It shows Figure 2 Enlarged view of point A in the middle;
[0028] Figure 4 It shows Figure 2 Enlarged diagram of point B in the middle.
[0029] Explanation of key component symbols:
[0030] 100 - Battery cell; 110 - First electrode; 210 - First direction; 220 - Second direction; 300 - Flexible welding strip; 310 - First corrugated section; 400 - Conductive plate; 500 - Busbar; 510 - Second corrugated section; 600 - Front panel; 700 - Back panel; 710 - Waterproof layer; 800 - Adhesive layer. Detailed Implementation
[0031] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.
[0032] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.
[0033] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.
[0034] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0035] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.
[0036] Combination Figures 2 to 4 As shown, an embodiment of this utility model provides a lightweight photovoltaic module, including a solar cell 100, a flexible welding strip 300, a conductive plate 400, and a busbar 500.
[0037] The battery cells 100 are arranged in multiple sequences along a first direction 210; the multiple battery cells 100 arranged along the first direction 210 form a group; multiple groups of battery cells 100 are arranged along a second direction 220, which is perpendicular to the first direction 210; the flexible solder ribbon 300 is sequentially welded to the first electrode 110 of each battery cell 100 arranged along the first direction 210; the flexible solder ribbon 300 is specifically a copper-based solder ribbon with a thickness of 0.1 mm and a silver plating layer ≥99.9%; the conductive... The plate 400 is sequentially welded to the second electrodes of each of the battery cells 100 arranged along the first direction 210; the busbar 500 has multiple segments, each segment of the busbar 500 is correspondingly disposed between two adjacent groups of battery cells 100, one end of the busbar 500 is connected to the flexible welding strip 300 of one group of battery cells 100, and the other end of the busbar 500 is welded to the conductive plate 400 of the other group of battery cells 100, so as to connect the groups of battery cells 100 in series.
[0038] The lightweight photovoltaic module provided in this embodiment has been optimized in terms of the connection method and structural layout of the solar cells 100. Specifically, the module achieves performance improvement through the following technical solutions:
[0039] First, the conductive plate 400 is welded to the second electrode of each group of solar cells 100 to ensure electrical continuity within each group of solar cells 100. Then, the first electrodes 110 of each group of solar cells 100 are sequentially welded together using flexible solder ribbons 300 to achieve a parallel structure within each group of solar cells 100. Based on this, the groups of solar cells 100 are further connected in series via busbars 500 to form a complete photovoltaic module circuit.
[0040] By dividing the solar cells 100 into multiple independent groups and using flexible solder ribbons 300 for parallel connection within groups and series connection between groups, this embodiment significantly shortens the length of each flexible solder ribbon 300 compared to the traditional design where a single solder ribbon runs through all solar cells 100. This design improvement is particularly important in applications where photovoltaic modules need to bend or adapt to a certain curvature. Because the flexible solder ribbon 300 is shorter, the stress concentration effect it experiences during bending is effectively alleviated, thereby significantly reducing the risk of solder ribbon breakage and improving the overall reliability of the module.
[0041] More importantly, the group welding design in this embodiment also gives the component higher fault tolerance. In extreme cases, even if the flexible solder strip 300 on a group of solar cells 100 breaks due to external force or environmental factors, it will only cause some solar cells 100 in that group to disconnect from the circuit, without affecting the normal operation of other groups of solar cells 100. Since the groups of solar cells 100 are connected in series through busbars 500, a local failure in a single group will not cause the circuit of the entire component to be interrupted, thus ensuring the continuous and stable operation of this embodiment in complex environments.
[0042] In some specific embodiments, the flexible solder ribbon 300 is provided with a first corrugated segment 310 corresponding to the solar cell 100. The first corrugated segment 310 is located at the gap between adjacent solar cells 100 arranged along the first direction 210. This design layout is intended to ensure that when the photovoltaic module is bent by external forces (such as wind, snow pressure, or mechanical stress during installation), the spacing between adjacent solar cells 100 may change. At this time, the first corrugated segment 310 can flexibly compress or expand accordingly, thereby effectively absorbing and dispersing the stress generated by external forces on the solder ribbon, avoiding breakage of the solder ribbon due to excessive stretching or compression, and thus ensuring the high reliability of this embodiment during use. Specifically, the corrugation amplitude of the first corrugated segment 310 of the flexible solder ribbon 300 is ±0.5mm, and the period is 2mm, ensuring stable use of this embodiment.
[0043] In some specific embodiments, the length of the first corrugated segment 310 is greater than the gap between two adjacent solar cells 100. The design idea is that by making the length of the first corrugated segment 310 exceed the width of the gap between the adjacent solar cells 100, it can be ensured that the first corrugated segment 310 can completely cover and span the gap between the two adjacent solar cells 100 when the photovoltaic module is bent or deformed.
[0044] Specifically, when a photovoltaic module bends due to external factors (such as wind, installation stress, etc.), the spacing between adjacent cells 100 may change. If the length of the first corrugated segment 310 is insufficient to cross this gap, then during the bending process, parts of the solder ribbon with poor deformation capacity (such as straight segments or areas with small corrugation amplitude) may protrude beyond the edge of the cell 100, thus being exposed to external forces and increasing the risk of the solder ribbon breaking.
[0045] By designing the length of the first corrugated segment 310 to be greater than the gap between adjacent solar cells 100, it can be ensured that the first corrugated segment 310 maintains contact with the solar cell 100 during bending, effectively dispersing and absorbing external forces, and preventing parts of the solder ribbon with poor deformation capacity from protruding from the edge of the solar cell 100. In this way, even under the action of external forces, the solder ribbon can adapt to bending through the elastic deformation of the first corrugated segment 310, thereby reducing the probability of the solder ribbon breaking and further improving the reliability of this embodiment in complex environments.
[0046] In some specific embodiments, each group of battery cells 100 has multiple flexible solder strips 300 arranged along the second direction 220; this design aims to improve the fault tolerance of the system by increasing redundant connection paths.
[0047] Specifically, during long-term use, photovoltaic modules may experience breakage or poor contact in one of the flexible solder ribbons 300 due to various external factors (such as environmental stress, mechanical vibration, thermal expansion and contraction). If each group of solar cells 100 relies on only a single solder ribbon for electrical connection, then once this solder ribbon fails, the parallel connection between the solar cells 100 in that group will be interrupted, thereby affecting the power generation efficiency of the entire photovoltaic module.
[0048] By providing multiple flexible solder ribbons 300 along the second direction 220 on each group of solar cells 100, it can be ensured that even if one flexible solder ribbon 300 breaks, the group of solar cells 100 can still be electrically connected through the other normal flexible solder ribbons 300. In this way, even if a solder ribbon fails, the parallel connection of the entire group of solar cells 100 will not be interrupted, thereby effectively improving the reliability of the parallel connection between the individual solar cells 100. This design not only enhances the durability of the photovoltaic module but also improves its power generation stability and efficiency in complex environments.
[0049] In some specific embodiments, a second corrugated section 510 is provided between the busbar 500 and the flexible solder strip 300 and the conductive plate 400, respectively. The second corrugated section 510 between the busbar 500 and the flexible solder strip 300 is arranged along the first direction 210, and the second corrugated section 510 between the busbar 500 and the conductive plate 400 is arranged along the second direction 220. By providing these second corrugated sections 510, this embodiment aims to avoid the risk of the busbar 500 breaking due to its inability to adapt to relative displacement when there is relative displacement between the battery cell 100 and the busbar 500, or between two adjacent sets of battery cells 100. Through the elastic deformation capability of the second corrugated section 510, the busbar 500 can effectively prevent breakage when relative displacement occurs between the solar cell 100 and the busbar 500, or between two adjacent sets of solar cells 100, thanks to the expansion and contraction and buffering effect of the second corrugated section 510. This ensures the high reliability of this embodiment during use. This design not only enhances the adaptability of photovoltaic modules in various complex environments but also improves their long-term stability and durability.
[0050] In some specific embodiments, the conductive plate 400 is a copper plate with mesh holes evenly distributed on it, in order to reduce the overall weight of this embodiment and reduce manufacturing costs.
[0051] like Figure 1 As shown, in some specific embodiments, the lightweight photovoltaic module further includes a front panel 600 and a back panel 700. The front panel 600 is made of high-gloss polymer PVC transparent material, which can ensure that sunlight can effectively enter the module and provide good lighting conditions for the photovoltaic effect. The solar cell 100 is located between the front panel 600 and the back panel 700 to provide fixation and support for the solar cell 100.
[0052] In some specific embodiments, an adhesive layer 800 is provided between the front panel 600 and the battery cell 100, and between the rear panel 700 and the battery cell 100. The adhesive layer 800 is composed of an adhesive colloid and is used to bond the front panel 600 and the rear panel 700 to the battery cell 100 respectively.
[0053] Furthermore, the adhesive primarily utilizes two mainstream materials: POE (polyolefin elastomer) and EVA (ethylene-vinyl acetate copolymer). These two materials have wide applications and a good reputation in the photovoltaic encapsulation field. They not only possess excellent adhesive properties, ensuring a tight connection between the solar cell 100 and the front and rear panels, but also exhibit outstanding encapsulation performance, effectively encapsulating the solar cell 100 layers to form a sealed and stable overall structure.
[0054] Specifically, after curing, POE and EVA materials form a tough and transparent protective film. This film not only resists the corrosion of harmful substances such as moisture and oxygen in the external environment, protecting the solar cells 100 from damage, but also enhances the overall mechanical strength of the photovoltaic module, improving its resistance to wind pressure and impact. Simultaneously, this protective film also helps to fix the solar cells 100 in place, preventing them from shifting or falling off during transportation, installation, or use, thereby ensuring the long-term stable operation of the photovoltaic module.
[0055] In some specific embodiments, the back panel 700 has a waterproof layer 710 on the end face opposite to the battery cell 100. The purpose of this waterproof layer 710 is to effectively isolate harmful factors such as moisture and humidity in the external environment, preventing them from penetrating into the module and causing corrosion or damage to the battery cell 100, conductive lines, and other key components.
[0056] Specifically, the waterproof layer 710 is meticulously constructed from a high-performance aluminum foil composite material. The aluminum foil composite layer is renowned for its superior waterproof performance; it not only adheres tightly to the end face of the backsheet 700, forming a robust barrier, but also effectively prevents the intrusion of external moisture. Simultaneously, the aluminum foil composite layer possesses excellent weather resistance and corrosion resistance, maintaining a stable waterproof effect even under prolonged exposure to outdoor environments, providing durable and reliable protection for the photovoltaic modules.
[0057] In practical applications, this waterproof layer 710, composed of an aluminum foil composite layer, not only significantly improves the waterproof rating of photovoltaic modules but also enhances the stability and durability of their overall structure. By effectively isolating moisture and humidity from the external environment, the waterproof layer 710 protects the internal structure of the module from problems such as dampness and mold, thereby ensuring that the photovoltaic modules can maintain efficient and stable power generation performance under various harsh environmental conditions.
[0058] In addition, the aluminum foil composite waterproof layer 710 also has good processing performance and easy installation. It can be cut, bent and other processed according to actual needs to adapt to photovoltaic modules of different shapes and sizes.
[0059] This utility model also provides a photovoltaic power generation device. The photovoltaic power generation device can be divided into stand-alone photovoltaic power generation devices, distributed photovoltaic power generation devices, etc., depending on its deployment scale. It includes the lightweight photovoltaic modules described in the foregoing embodiments. The photovoltaic power generation device has all the beneficial effects of lightweight photovoltaic modules, which will not be described in detail here.
[0060] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.
[0061] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.
Claims
1. A lightweight photovoltaic module, characterized in that, include: A battery cell (100) is provided, wherein a plurality of battery cells (100) are arranged sequentially along a first direction (210); the plurality of battery cells (100) arranged along the first direction (210) form a group; and a plurality of battery cells (100) are provided along a second direction (220), wherein the second direction (220) is perpendicular to the first direction (210). Flexible welding strip (300) is sequentially welded to the first electrode (110) of each of the battery cells (100) arranged along the first direction (210); A conductive plate (400) is sequentially welded to the second electrode of each of the battery cells (100) arranged along the first direction (210); A busbar (500) has multiple segments, each segment of the busbar (500) being disposed between two adjacent groups of battery cells (100). One end of the busbar (500) is connected to the flexible solder strip (300) of one group of battery cells (100), and the other end of the busbar (500) is connected to the conductive plate (400) of the other group of battery cells (100) to connect the battery cells (100) in series.
2. The lightweight photovoltaic module according to claim 1, characterized in that, The flexible welding strip (300) is provided with a first corrugated segment (310) corresponding to the battery cell (100), and the first corrugated segment (310) is located at the gap between adjacent battery cells (100) arranged along the first direction (210).
3. The lightweight photovoltaic module according to claim 2, characterized in that, The length of the first corrugated segment (310) is greater than the gap between two adjacent battery cells (100).
4. The lightweight photovoltaic module according to claim 1, characterized in that, The flexible solder strips (300) on each of the battery cells (100) are provided in a plurality along the second direction (220).
5. The lightweight photovoltaic module according to claim 1, characterized in that, The busbar (500) is provided with a second corrugated section (510) between itself, the flexible solder strip (300), and the conductive plate (400). The second corrugated section (510) between the busbar (500) and the flexible solder strip (300) is arranged along the first direction (210), and the second corrugated section (510) between the busbar (500) and the conductive plate (400) is arranged along the second direction (220).
6. The lightweight photovoltaic module according to claim 1, characterized in that, The conductive plate (400) is a copper plate, and the copper plate is evenly distributed with mesh holes.
7. The lightweight photovoltaic module according to any one of claims 1 to 6, characterized in that, It also includes a front panel (600) and a rear panel (700), the front panel (600) being made of transparent material, and the battery cell (100) being located between the front panel (600) and the rear panel (700).
8. The lightweight photovoltaic module according to claim 7, characterized in that, An adhesive layer (800) is provided between the front panel (600) and the battery cell (100), and between the rear panel (700) and the battery cell (100). The adhesive layer (800) is composed of an adhesive colloid and is used to bond the front panel (600) and the rear panel (700) to the battery cell (100) respectively.
9. The lightweight photovoltaic module according to claim 7, characterized in that, The back panel (700) has a waterproof layer (710) on the end face away from the battery cell (100).
10. A photovoltaic power generation device, characterized in that, Includes lightweight photovoltaic modules as described in any one of claims 1 to 9.