Backboard for photovoltaic module and photovoltaic module

Abstract

The backboard comprises a body, an installation part and a fixing part, the installation part and the fixing part are arranged on the two opposite sides of the body respectively, an installation groove used for installing a battery module is formed in the installation part, and the depth of the installation groove is smaller than or equal to the thickness of the battery module. According to the technical scheme, the technical problems that a traditional photovoltaic module is too large in body weight, single in use scene and prone to generating a hot spot effect due to the fact that accumulated dust is blocked are effectively solved.

Description

Technical Field

[0001] The present application relates to the field of photovoltaic technology, and in particular to a backplane for a photovoltaic module and a photovoltaic module. Background Art

[0002] Photovoltaic modules are the core components of photovoltaic power generation systems, and their function is to convert light energy into electrical energy. Traditional photovoltaic modules are generally packaged with back panels and aluminum frames. This makes the entire photovoltaic module heavy, unfriendly to load-sensitive installation scenarios, and has a single application scenario; and because the height of the aluminum frame is higher than the front glass, when used outdoors, dust is easily accumulated at the packaging of the aluminum frame and the front glass, causing the photovoltaic module to be partially blocked and produce a hot spot effect. The blocked photovoltaic module will consume part or all of the energy generated by the illuminated photovoltaic module, reducing the output power, and in severe cases, it will permanently damage the battery cells or even burn the battery cells. Utility Model Content

[0003] The present application provides a backplane and photovoltaic module for a photovoltaic module to solve the technical problems of traditional photovoltaic modules being too heavy, having a single usage scenario, and being easily obscured by dust and causing hot spot effects.

[0004] To this end, in the first aspect, an embodiment of the present application provides a backplane for a photovoltaic module, comprising a main body, a mounting portion and a fixing portion, the mounting portion and the fixing portion being respectively arranged on opposite sides of the main body, and the mounting portion being provided with a mounting groove for installing a battery module, and a groove depth of the mounting groove is less than or equal to the thickness of the battery module.

[0005] In a possible implementation, a first liquid flow channel is provided in the main body, and a straight line where an extension direction of the first liquid flow channel is located is parallel to a plane where the battery module is located.

[0006] In a possible implementation, the first liquid flow channel is provided with multiple layers in the thickness direction of the back plate, and the liquids in two adjacent layers of the first liquid flow channel flow in opposite directions; and / or,

[0007] In the width direction of the back plate, a plurality of rows of first liquid flow channels are provided, and the liquid flow directions in two adjacent rows of first liquid flow channels are opposite.

[0008] In a possible implementation, a second liquid flow channel is provided in the fixing portion, and the second liquid flow channel is communicated with the first liquid flow channel.

[0009] In a possible implementation, in the thickness direction of the back plate, the cross section of the first liquid flow channel is any one of a honeycomb shape, an I-shape, a corrugated shape, a cylinder or a prism; and / or,

[0010] In the thickness direction of the back plate, the cross section of the second liquid flow channel is any one of a honeycomb shape, an I-shape, a corrugated shape, a cylinder shape or a prism shape.

[0011] In a possible implementation manner, in the thickness direction of the back plate, a ratio of the thickness of the main body to the thickness of the mounting portion is 1-80.

[0012] In a possible embodiment, the fixing portion includes a first fixing member and a second fixing member, both extending along the length direction of the back panel. The first fixing member and the second fixing member are relatively arranged in the width direction of the back panel and are combined with the back side of the main body to form a fixing groove. The back panel is connected and fastened to the support frame through the fixing groove.

[0013] In a second aspect, the present application provides a photovoltaic module, comprising a battery module and a backplane as described above, wherein the battery module is embedded in a mounting groove of the backplane, and the battery module extends out of the mounting groove away from the backplane, or the side of the battery module away from the backplane is flush with the top surface of the mounting groove.

[0014] In a possible implementation, the battery module includes a front packaging material layer, a first adhesive film layer, a battery layer and a second adhesive film layer sequentially arranged along the thickness direction of the back plate, and the front packaging material layer is exposed from the back plate.

[0015] In a possible implementation manner, the thickness of the front packaging material layer is 0.1 mm to 1.5 mm.

[0016] According to the backplane and photovoltaic module for photovoltaic modules provided in the embodiment of the present application, the backplane includes a body, a mounting portion and a fixing portion, the mounting portion and the fixing portion are respectively arranged on opposite sides of the body, and the mounting portion is provided with a mounting groove for mounting a battery module, and the groove depth of the mounting groove is less than or equal to the thickness of the battery module. The technical solution of the present application uses a backplane to replace the traditional combination design of back glass and aluminum frame, which effectively reduces the total weight of the photovoltaic module encapsulated using the above-mentioned backplane, so that the photovoltaic module can be applied to installation scenarios with more sensitive loads, such as the photovoltaic module can be applied to floating power generation or lightweight application scenarios on water, expanding the scope of application of the photovoltaic module. In addition, the depth of the mounting groove is set to be less than or equal to the thickness of the battery module, that is, the battery module is embedded in the mounting groove, which can not only seal and tighten the periphery of the battery assembly to prevent water vapor from entering the battery module from the side of the battery module, thereby improving the performance of the battery module; it can also make the top of the mounting portion flush with or slightly lower than the top of the battery module, thereby avoiding the problem that the traditional frame needs to extend part of the battery module, resulting in dust accumulation and obstruction at the periphery of the top surface of the battery module, thereby causing the photovoltaic module to produce a hot spot effect, thereby ensuring the output power of the photovoltaic module and improving the operating safety of the photovoltaic module. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings herein are incorporated into the specification and constitute a part of the specification, showing embodiments that conform to the present application, and are used together with the specification to explain the principles of the present application. In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can also be obtained based on these drawings without paying creative labor. One or more embodiments are exemplarily illustrated by the pictures in the corresponding drawings. These exemplified descriptions do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are represented as similar elements. Unless otherwise stated, the figures in the drawings do not constitute a proportional limitation.

[0018] Figure 1 An exploded view of a photovoltaic module provided in an embodiment of the present application;

[0019] Figure 2 A partial side cross-sectional view of a photovoltaic module after assembly provided in an embodiment of the present application;

[0020] Figure 3 A side view of a honeycomb-shaped back plate provided in an embodiment of the present application;

[0021] Figure 4 for Figure 3 A partial enlarged view of the middle A;

[0022] Figure 5 A side view of an I-shaped back plate provided in an embodiment of the present application;

[0023] Figure 6 for Figure 5 A partial enlarged view of point B in the middle.

[0024] Description of reference numerals:

[0025] 100, main body; 101, first liquid flow channel; 110, first skeleton;

[0026] 200, mounting portion; 201, mounting groove; 210, first folding edge; 220, second folding edge;

[0027] 300, fixing part; 301, second liquid flow channel; 302, fixing groove; 310, second frame; 320, first fixing member; 330, second fixing member;

[0028] 10. backplane; 20. battery module; 21. front packaging material layer; 22. first adhesive film layer; 23. battery layer; 24. second adhesive film layer;

[0029] Z, thickness direction; X, width direction; Y, length direction. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0031] The disclosure below provides many different embodiments or examples to realize the different structures of the present application. In order to simplify the disclosure of the present application, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present application. In addition, the present application can repeat reference numbers and / or letters in different examples. This repetition is for the purpose of simplification and clarity, and does not indicate the relationship between the various embodiments and / or settings discussed in itself. In addition, the various specific processes and examples of materials provided by the present application, but those of ordinary skill in the art can appreciate the applicability of other processes and / or the use of other materials.

[0032] For ease of description, spatial relative terms may be used herein to describe the relative positional relationship or movement of one element or feature relative to another element or feature as shown in the figure, such as "inside", "outside", "inner side", "outer side", "below", "below", "above", "above", "front", "back", etc. Such spatial relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figure. For example, if the device in the figure undergoes a position flip or a posture change or a motion state change, then these directional indications also change accordingly, for example: an element described as "below other elements or features" or "below other elements or features" will subsequently be oriented as "above other elements or features" or "above other elements or features". Therefore, the example term "below..." may include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions) and the spatial relative descriptors used herein are interpreted accordingly.

[0033] See also Figures 1 to 6 The embodiment of the present application provides a backplane for a photovoltaic module, including a main body 100, a mounting portion 200 and a fixing portion 300, wherein the mounting portion 200 and the fixing portion 300 are respectively arranged on opposite sides of the main body 100, and the fixing portion 300 is connected to a support frame so as to fix the photovoltaic module on the support frame. The mounting portion 200 is provided with a mounting groove 201 for mounting a battery module 20, and a groove depth of the mounting groove 201 is less than or equal to a thickness of the battery module 20.

[0034] In this embodiment, the back plate 10 is used to replace the traditional back glass and aluminum frame combination design, which effectively reduces the total weight of the photovoltaic module encapsulated using the above back plate 10, so that the photovoltaic module can be applied to the installation scene with more sensitive loads, such as the photovoltaic module can be applied to floating power generation or lightweight application scenes on water, expanding the scope of application of the photovoltaic module. In addition, the groove depth of the installation groove 201 is set to be less than or equal to the thickness of the battery module 20, that is, the battery module 20 is embedded in the installation groove 201, which can not only encapsulate and tighten the periphery of the battery module to prevent water vapor from entering the battery module 20 from the side of the battery module 20, thereby improving the performance of the battery module 20; and can also make the top of the installation part 200 flush with the top of the battery module 20 or slightly lower than the top of the battery module 20, avoiding the problem that the traditional frame needs to extend a part of the battery module 20, resulting in dust accumulation and shielding at the periphery of the top surface of the battery module 20, and then causing the photovoltaic module to produce a hot spot effect, thereby ensuring the output power of the photovoltaic module and improving the operation safety of the photovoltaic module.

[0035] It should be explained that the minimum depth of the mounting groove 201 should be sufficient to accommodate at least a portion of the front packaging material layer 21 set on the top of the battery module 20, so as to accommodate part or all of the front packaging material layer 21 in the mounting groove 201, prevent water vapor from entering the battery module 20 through the gap between the front packaging material layer 21 and the first adhesive film layer 22, and improve the limitation and fixation of the side of the battery module 20.

[0036] Specifically, the back plate 10 for the photovoltaic module is configured as a composite component including at least a body 100, a mounting portion 200 and a fixing portion 300. The body 100 may be a long plate-shaped structure with both the front and back surfaces being flat, which is used to provide support for the battery module and is used to integrate the mounting portion 200 and the fixing portion 300. The mounting portion 200 may be a long plate-shaped structure, the bottom of which may be a flat surface, so as to fit and connect with the front surface of the body 100, thereby enhancing the connection tightness between the mounting portion 200 and the body 100; the mounting portion 200 is provided with a mounting groove 201, which may be an integrated rectangular sheet groove structure, the size of which may be slightly smaller than the size of the body 100, so as to accommodate the battery module 20 in the space corresponding to the body 100, improve the support for the battery module 20, and improve the operation stability of the battery module 20; the shape of the mounting groove 201 may be substantially similar to the shape of the body 100, so as to accommodate the battery module to the maximum extent, improve the energy density of the photovoltaic module, and improve the output power of the photovoltaic module. Of course, in other embodiments, the mounting slot 201 can also be a split small unit slot body. In this case, the battery module 20 should also be a small unit module, and a small unit battery is assembled into a small unit slot body. The fixing part 300 can be a square column structure with a certain thickness, and its top can be a plane, so as to fit and connect with the back of the body 100 to enhance the connection tightness between the fixing part 300 and the body 100; the fixing part 300 can be connected to the support frame by means of clamping, screw / bolt and other fasteners, bonding or welding, etc., and the specific connection method between the fixing part 300 and the external support frame is not limited here.

[0037] For example, the backboard 10 can be a long plate-shaped structure, which can be made of materials such as PVC / ABS / PP / PE / PPR, so that the backboard 10 has good corrosion resistance, heat resistance, flame retardancy, certain flexibility and toughness, and becomes a new type of reinforcing material that can replace the back glass and aluminum frame in the traditional packaging process. In addition, the backboard 10 structure provided by the present application can reduce the weight of the photovoltaic module by 45% to 55%. In actual operation, the weight of the photovoltaic module can be reduced from 12.12kg / m 2 Reduced to 5.6kg / m 2 ~6.4kg / m 2 , which makes it possible to apply the photovoltaic module to water or offshore floating power generation and other lightweight application scenarios, expanding the application scenarios of photovoltaic modules.

[0038] In one example, the mounting portion 200 includes a first folded edge 210 and a second folded edge 220 that are arranged oppositely, and a third folded edge (not shown in the figure) and a fourth folded edge (not shown in the figure) that are arranged oppositely. The first folded edge 210, the third folded edge, the second folded edge 220 and the fourth folded edge are connected end to end and enclosed to form a mounting groove 201. The first folded edge 210 and the second folded edge 220 can be long strip structures, which are respectively vertically arranged on the two long side edges of the body 100; the third folded edge and the fourth folded edge can be short strip structures, which are respectively vertically arranged on the two short side edges of the body 100, so that the enclosed mounting groove 201 has a maximum size, can accommodate more battery modules 20, improve the energy density of the photovoltaic module, and improve the output power of the photovoltaic module.

[0039] In one example, the mounting portion 200, the body 100 and the fixing portion 300 are integrally formed, for example, by injection molding or other one-step molding processes, which are simple and convenient to manufacture and are conducive to industrial production. The back plate 10 is designed as an integrated structure. On the one hand, it can effectively enhance the toughness and strength of the overall structure of the back plate 10, and improve the service life and aesthetics of the back plate 10; on the other hand, the connection and assembly sites of the battery module 20 and the support frame can be integrated on the back plate 10, enriching the functions of the back plate 10, reducing the setting of the connection components on the support frame side, and improving the convenience of using the photovoltaic module using the back plate 10.

[0040] In a possible embodiment, a first liquid flow channel 101 is provided in the body 100, and the straight line in which the extension direction of the first liquid flow channel 101 is located is parallel to the plane where the battery module 20 is located. In this way, the body 100 can be cooled by passing cooling water or refrigerant into the first liquid flow channel 101, thereby cooling and dissipating the battery module 20 assembled in the mounting groove 201, improving the working efficiency of the battery module 20, and extending the service life of the battery module 20. In addition, the first liquid flow channel 101 is configured along the length direction Y of the body 100, so that the cooling water or refrigerant can flow along the length direction Y of the body 100, and quickly dissipate the heat of the battery module 20. It should be understood that the body 100 is provided with a liquid inlet and a liquid outlet connected to the first liquid flow channel 101, and the liquid inlet and the liquid outlet can be arranged diagonally in a plane or diagonally in space to extend the flow path of the cooling water or refrigerant in the body 100, extend the heat exchange time between the cooling water or refrigerant and the battery module 20, and improve the heat dissipation effect of the battery module 20.

[0041] In hot seasons such as summer, in order to reduce heat loss and improve the utilization rate of heat generated by the battery module 20, cold water can be introduced into the first liquid flow channel 101. At this time, the cold water in the first liquid flow channel 101 realizes heat exchange with the heat generated by the battery module 20, which not only reduces the temperature of the battery module 20, so that the battery module 20 maintains the optimal working temperature, but also increases the temperature of the hot water for washing. The photovoltaic module can provide users with hot or warm water for washing, further enriching the use function of the backplane 10.

[0042] Of course, in cold seasons such as winter, in order to prevent the battery module 20 of the photovoltaic assembly from malfunctioning / failure due to low temperature, hot water or warm water can also be introduced into the first liquid pipeline. At this time, the hot water / warm water exchanges heat with the battery module 20 in the first liquid flow channel 101, so that the battery module 20 maintains the optimal working temperature. The operator can add liquid of the required temperature into the first liquid flow channel 101 according to actual needs, and the liquid temperature in the first liquid flow channel 101 is not limited here.

[0043] In a possible implementation, the first liquid flow channel 101 is provided with multiple layers in the thickness direction Z of the back plate 10, and the liquid flow directions in two adjacent layers of the first liquid flow channel 101 are opposite. In this way, the first liquid flow channel 101 can be connected in a serpentine or S-shaped manner in the direction perpendicular to the battery module 20. The flow channel layout in this embodiment can make the back plate 10 suitable for situations where rapid heat dissipation of the entire area of ​​the battery module 20 is required. For example, the liquid inlet can be set at the top of the battery module 20, and the area close to the battery module 20 is preferentially heat exchanged and cooled by the cold water with the lowest temperature, and then flows to other areas corresponding to the battery module 20 that are gradually away from the battery module 20 for heat exchange, so that the entire area of ​​the battery module 20 can achieve rapid heat dissipation and cooling at the same time.

[0044] For the convenience of explanation, it can be first set that a first liquid flow channel 101 is provided in each layer of the flow channel area, and the liquid inlet is set at the inflow end of the first liquid flow channel 101 at the top of the main body 100 close to the battery module 20, and the liquid outlet is set at the outflow end of the first liquid flow channel 101 at the bottom of the main body 100 away from the battery module 20. At this time, cold water is introduced into the first liquid flow channel 101, and the cold water flows from the top of the main body 100 along its own length direction Y, and then flows back and forth along the length direction Y of the main body 100 until it flows out from the bottom of the main body 100. In this way, the main body 100 can achieve layer-by-layer heat dissipation and cooling in the thickness direction Z of the back plate 10, which can not only achieve rapid heat dissipation of the battery module 20 and improve the heat dissipation effect; it can also extend the flow time of cold water in the main body 100 and improve the heat exchange efficiency of the cold water.

[0045] Of course, in other embodiments, a plurality of first liquid flow channels 101 arranged side by side may be provided in each layer of the flow channel area, and two adjacent first liquid flow channels 101 in each layer may be connected end to end to form a serpentine or S-shaped flow channel area in each layer of the flow channel area. In this case, the liquid inlet and the liquid outlet are arranged diagonally in space, for example, the liquid inlet is arranged at the upper left corner of the body 100, and the liquid outlet is arranged at the lower right corner of the body 100. Under this flow channel structure, the heat exchange efficiency of cold water is the highest.

[0046] Alternatively, each first liquid flow channel 101 of each layer is connected through a transverse channel extending along the width direction X of the back plate 10 at its inflow end and outflow end, so as to form a plurality of linear flow channels arranged side by side in each layer of the flow channel area, so that the cold water simultaneously enters the flow position of the same length of the body 100. At this time, the liquid inlet and the liquid outlet can be arranged diagonally in a plane, for example, the liquid inlet and the liquid outlet can be arranged at the left or right side of the body 100 at the same time. Under this flow channel structure, the cooling water can cover the plurality of first liquid flow channels 101 at the top at the fastest speed, so as to achieve rapid heat dissipation of the battery module 20, and the heat dissipation efficiency of the battery module 20 is optimal.

[0047] In a possible embodiment, in the width direction X of the back plate 10, a plurality of columns of the first liquid flow channels 101 are provided, and the liquid flow directions in two adjacent columns of the first liquid flow channels 101 are opposite. In this way, the first liquid flow channels 101 can be connected in a serpentine or S-shaped manner in the direction parallel to the battery module 20. The flow channel layout in this embodiment can make the back plate 10 suitable for situations where rapid heat dissipation of a local area of ​​the battery module 20 is required. For example, the liquid inlet can be set at the front side position of the battery module 20 where the heat generation is the highest, and the cold water with the lowest temperature is used to exchange heat and cool it down, and then it flows to other areas corresponding to the battery module 20 with slightly lower heat generation for heat exchange, so that the battery module 20 can maintain uniform temperature heat dissipation; and the effective heat exchange efficiency of the cold water can be improved.

[0048] For the convenience of explanation, it can be set that a first liquid flow channel 101 is provided in each column of the flow channel area. At the same time, the liquid inlet is set at the left front of the main body 100, and the liquid outlet is set at the right rear or left rear of the main body 100. It is set that the front side of the battery module 20 generates the most heat and the rear side generates the least heat. At this time, cold water is introduced into the first liquid flow channel 101, and the cold water flows from the front side of the main body 100 along the length direction Y of the back plate 10, and then flows back and forth along the length direction Y of the main body 100 until it flows out from the rear side of the main body 100, so as to realize the gradual heat dissipation and cooling of the main body 100 in the width direction X of the back plate 10, and realize the regional cooling of the battery module 20. It should be explained that the front side here refers to the left or right side of the main body 100 observed from the length direction Y of the back plate 10; the rear side here refers to the right or left side of the main body 100 opposite to the front side.

[0049] Of course, in other embodiments, a plurality of first liquid flow channels 101 arranged in parallel may be provided in each column of flow channel area, and two adjacent first liquid flow channels 101 in each column may be connected end to end to form a serpentine or S-shaped flow channel area in each column of flow channel area. In this case, the liquid inlet and the liquid outlet may be arranged diagonally in a plane, for example, the liquid inlet is arranged at the left front of the body 100, and the liquid outlet is arranged at the left rear of the body 100. Under this flow channel structure, the heat exchange efficiency of cold water is the highest.

[0050] Alternatively, each first liquid flow channel 101 of each column is connected through a vertical channel extending along the width direction X of the back plate 10 at its inflow end and outflow end, so as to form a plurality of straight flow channels arranged side by side in each column of the flow channel area, so that the cold water simultaneously enters the flow position of the same length of the body 100. At this time, the liquid inlet and the liquid outlet can be arranged diagonally in a plane, for example, the liquid inlet and the liquid outlet can be arranged on the left or right side of the body 100 at the same time; they can also be arranged diagonally in space, for example, the liquid inlet can be arranged on the left front side of the body 100, and the liquid outlet can be arranged on the right rear side of the body 100. Under this flow channel structure, the cooling water can cover the plurality of first liquid flow channels 101 on the front side at the fastest speed, so as to achieve rapid heat dissipation of the battery module 20 at that location, and the local heat dissipation effect of the battery module 20 is the best.

[0051] In a possible implementation, a second liquid flow channel 301 is provided in the fixing portion 300, and the second liquid flow channel 301 is connected to the first liquid flow channel 101. In this way, the fixing portion 300 can be used to dissipate heat and cool the body 100, thereby improving the heat dissipation effect of the battery module 20; and the support frame can be configured in the fixing groove 302 of the fixing portion 300 due to the principle of thermal expansion and contraction.

[0052] In one example, the straight line where the second liquid flow channel 301 extends is parallel to the straight line where the first liquid flow channel 101 extends; and / or, the second liquid flow channel 301 is provided in the fixing part 300, and the straight line where the second liquid flow channel 301 extends is arranged at an angle to the straight line where the first liquid flow channel 101 extends. With such an arrangement, the fixing part 300 can be cooled by passing cooling water or refrigerant into the second liquid flow channel 301. On the one hand, the fixing part 300 can cool the main body 100, thereby improving the heat dissipation effect of the battery module 20; on the other hand, according to the principle of thermal expansion and contraction, the fixing part 300 with a lower temperature can make the support frame interference-embedded in the fixing groove 302 of the fixing part 300, further improving the connection tightness between the fixing part 300 and the support frame, and improving the stability and reliability of the photovoltaic module.

[0053] In one example, the second liquid flow channel 301 is arranged in parallel with the first liquid flow channel 101 to reduce the difficulty of processing the flow channel inside the back plate 10. At the same time, the first liquid flow channel 101 and the second liquid flow channel 301 can be processed using the same flow channel mold to reduce the production cost of the back plate 10.

[0054] In another example, the second liquid flow channel 301 is arranged at an angle with the first liquid flow channel 101. For example, the second liquid flow channel 301 can be arranged perpendicular to the first liquid flow channel 101, and the outlet of the first liquid flow channel 101 is connected to the inlet of the second liquid flow channel 301. In this way, the fixing part 300 and the main body 100 can use the same cold water circulation system to reduce the use cost.

[0055] In a possible embodiment, in the thickness direction Z of the back plate 10, the cross-section of the first liquid flow channel 101 is any one of a honeycomb shape, an I-shaped shape, a corrugated shape, a cylindrical shape or a prismatic shape. With such a configuration, the contact area between the refrigerant and the main body 100 can be increased through the inner wall surface of the honeycomb shape, the I-shaped shape, the corrugated shape, the cylindrical shape or the prismatic shape, and the flow distance of the refrigerant in the first liquid flow channel 101 can be extended to improve the heat exchange and cooling effect. At the same time, the weight of the main body 100 can be reduced by building a honeycomb shape, an I-shaped shape, a corrugated shape, a cylindrical shape or a prismatic shape of the first liquid flow channel 101 in the main body 100, thereby reducing the total weight of the photovoltaic module. In addition, the first liquid flow channel 101 in the present embodiment can be constructed by the first skeleton 110, and the first skeleton 110 can be an integrated structure or a split structure, and the operator can choose according to needs.

[0056] For example, when the first liquid flow channel 101 is honeycomb-shaped, the cross-section of the partial first skeleton 110 located on both sides of the first liquid flow channel 101 may be a flat-mouthed special-shaped structure, which may be formed by enclosing a plurality of honeycomb-shaped walls extending along the length direction Y of the back plate 10. Alternatively, when the first liquid flow channel 101 is I-shaped, the cross-section of the partial first skeleton 110 located on both sides of the first liquid flow channel 101 may be a cross-shaped structure, which may be formed by enclosing a plurality of I-shaped walls extending along the length direction Y of the back plate 10.

[0057] In a possible embodiment, in the thickness direction Z of the back plate 10, the cross section of the second liquid flow channel 301 is any one of a honeycomb shape, an I-shaped shape, a corrugated shape, a cylindrical shape or a prismatic shape. Such a configuration can not only cool the fixed part 300, so as to utilize the principle of thermal expansion and contraction to make the support frame interference-embedded in the fixed groove 302 of the fixed part 300, thereby improving the connection tightness between the fixed part 300 and the support frame; it can also increase the contact area between the refrigerant and the fixed part 300 through the inner wall surface of the honeycomb shape, the I-shaped shape, the corrugated shape, the cylindrical shape or the prismatic shape, extend the flow distance of the refrigerant in the second liquid flow channel 301, and improve the heat exchange and cooling effect. At the same time, it is also possible to reduce the weight of the fixed part 300 by building a honeycomb shape, an I-shaped shape, a corrugated shape, a cylindrical shape or a prismatic shape of the second liquid flow channel 301 in the fixed part 300, thereby reducing the total weight of the photovoltaic module. In addition, the second liquid flow channel 301 in this embodiment can be constructed by a second skeleton 310. The second skeleton 310 can be an integrated structure or a split structure, and the operator can choose according to needs.

[0058] For example, when the second liquid flow channel 301 is honeycomb-shaped, the cross-section of the partial second skeleton 310 located on both sides of the second liquid flow channel 301 can be a flat-mouthed special-shaped structure, which can be formed by enclosing a plurality of honeycomb-shaped walls extending along the length direction Y of the back plate 10, or by enclosing a plurality of honeycomb-shaped walls extending along the thickness direction Z of the back plate 10. Alternatively, when the second liquid flow channel 301 is I-shaped, the cross-section of the partial second skeleton 310 located on both sides of the second liquid flow channel 301 can be a cross-shaped structure, which can be formed by enclosing a plurality of I-shaped walls extending along the length direction Y of the back plate 10, or by enclosing a plurality of I-shaped walls extending along the thickness direction Z of the back plate 10.

[0059] In a possible embodiment, in the thickness direction Z of the back plate 10, the ratio of the thickness of the main body 100 to the thickness of the mounting portion 200 is 1 to 80. In this way, while satisfying the normal connection function of the back plate 10 to the battery module 20, the thickness of the back plate 10 can be compressed to the maximum extent, the total weight of the photovoltaic module can be reduced, and the thickness ratio between the main body 100 and the mounting portion 200 is within a suitable range. For example, the thickness of the mounting portion 200 can be selected according to the thickness of the battery module 20 to avoid wasting space on the mounting portion 200 in the thickness direction Z; the thickness of the main body 100 can be selected according to the total heat dissipation demand of the battery module 20 installed on the photovoltaic module to improve the space utilization of the main body 100 in the thickness direction Z. For example, but not limited to, the ratio of the thickness of the main body 100 to the thickness of the mounting portion 200 can be 10, that is, the thickness of the main body 100 is 10 times the thickness of the mounting portion 200.

[0060] In one example, the thickness of the body 100 is less than the thickness of the fixing portion 300. In this way, while satisfying the normal connection function of the back sheet 10 to the support frame, the thickness of the back sheet 10 can be compressed to the maximum extent, thereby reducing the total weight of the photovoltaic module. For example, the thickness of the fixing portion 300 can be selected according to the thickness of the support frame, thereby enhancing the connection tightness between the fixing portion 300 and the support frame while avoiding wasting space in the thickness direction Z of the fixing portion 300.

[0061] In a possible embodiment, the fixing portion 300 includes a first fixing member 320 and a second fixing member 330, both extending along the length direction Y of the back panel 10. The first fixing member 320 and the second fixing member 330 are relatively arranged in the width direction X of the back panel 10, and are combined with the back side of the main body 100 to form a fixing groove 302. The back panel 10 is connected and fastened to the support frame through the fixing groove 302.

[0062] In this embodiment, the specific configuration of the fixing part 300 is optimized. Specifically, the fixing part 300 is configured as a combined component including at least a first fixing member 320 and a second fixing member 330. The first fixing member 320 and the second fixing member 330 can have the same shape and size, and can both be long and narrow plate structures, which are respectively arranged on two opposite long sides of the body 100, and enclosed with the back of the body 100 to form an open U-shaped fixing groove 302, and one end of the support frame can be inserted into the fixing groove 302 to achieve the connection and fastening between the support frame and the fixing part 300. In this way, by using the back of the body 100 to form a part of the fixing groove 302, the space waste of the fixing part 300 in the thickness direction Z can be reduced, and the thickness of the back plate 10 can be further reduced, and the weight of the back plate 10 can be reduced. In addition, the structure is simple, convenient for processing, low in production cost, and conducive to industrial production.

[0063] In addition, the present application provides a photovoltaic module, including a battery module 20 and a back panel 10 as described above, wherein the battery module 20 is embedded in a mounting groove 201 of the back panel 10, and the side of the battery module 20 away from the back panel 10 extends out of the mounting groove 201, or the side of the battery module 20 away from the back panel 10 is flush with the top surface of the mounting groove 201.

[0064] In this embodiment, the back plate 10 is used to replace the traditional back glass and aluminum frame combination design to reduce the total weight of the photovoltaic module encapsulated by the back plate 10, so that the photovoltaic module can be applied to the installation scene with more sensitive loads, such as the photovoltaic module can be applied to floating power generation or lightweight application scenes on water, thus expanding the application scope of the photovoltaic module. In addition, the groove depth of the installation groove 201 is set to be less than or equal to the thickness of the battery module 20, that is, the battery module 20 is embedded in the installation groove 201, which can not only encapsulate and tighten the periphery of the battery module to prevent water vapor from entering the battery module 20 from the side of the battery module 20, thereby improving the performance of the battery module 20; and the outer side surface of the installation part 200 can be kept flush with the outer side surface of the battery module 20 or slightly lower than the outer side surface of the battery module 20, thereby avoiding the problem that the traditional frame needs to extend a part of the battery module 20, resulting in dust accumulation and shielding at the periphery of the top surface of the battery module 20, thereby causing the photovoltaic module to produce a hot spot effect, thereby ensuring the output power of the photovoltaic module and improving the operation safety of the photovoltaic module.

[0065] Specifically, the battery module 20 is embedded in the mounting groove 201 of the back plate 10, and the outer surface of the battery module 20 is made to be a pure plane without the shielding of the mounting portion 200, so as to avoid the occurrence of partial shielding caused by dust accumulation at the edge of the outer surface of the battery module 20 during long-term use, thereby overcoming the problem of hot spot effect of the photovoltaic module and improving the output power of the photovoltaic module. At the same time, the specific structure of the back plate 10 used for the photovoltaic module refers to the above embodiment. Since the photovoltaic module adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here.

[0066] In a possible implementation, the battery module 20 includes a front packaging material layer 21 , a first adhesive film layer 22 , a battery layer 23 and a second adhesive film layer 24 sequentially arranged along the thickness direction Z of the back plate 10 , and the front packaging material layer 21 is exposed from the back plate 10 .

[0067] In this embodiment, the front packaging material layer 21 and the battery layer 23 are connected and fastened by the first adhesive film layer 22, and the battery layer 23 and the bottom of the mounting groove 201 are connected and fastened by the second adhesive film layer 24, so that the battery module 20 is encapsulated by the adhesive film layer. After hot melting, the first adhesive film layer 22 can be filled into the gap between the front packaging material layer 21 and the corresponding side wall of the mounting groove 201, and the second adhesive film layer 24 can be filled into the gap between the battery layer 23 and the corresponding side wall of the mounting groove 201. In this way, on the one hand, the connection and fastening between the front packaging material layer 21 and the mounting groove 201, and the battery layer 23 and the mounting groove 201 can be enhanced, and the stability of the overall structure of the photovoltaic module can be improved; on the other hand, the sealing between the battery module 20 and the mounting groove 201 can be achieved by the adhesive film layer to prevent water vapor from entering the battery layer 23, so as to protect the battery layer 23.

[0068] In a possible implementation, the thickness of the front encapsulation material layer 21 is 0.1 mm to 1.5 mm. This arrangement can ensure the hardness and rigidity of the front encapsulation material and improve the protection of the battery layer 23; it can also reduce the thickness of the battery module 20 and reduce the total weight of the photovoltaic module. For example, the front encapsulation material can be a 1.1 mm ultra-thin photovoltaic glass specially made by Lens, or it can also be a protective piece made of other ultra-thin glass / high-transmittance PC materials.

[0069] It should be understood that the terms used herein are only for the purpose of describing specific example embodiments and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used herein may also be meant to include plural forms. The terms "include", "comprise", "contain", and "have" are inclusive, and therefore specify the existence of stated features, steps, operations, elements and / or parts, but do not exclude the existence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not interpreted as necessarily requiring them to be performed in the specific order described or illustrated, unless the execution order is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0070] Although the terms first, second, third, etc. can be used in the text to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teaching of the example embodiments.

[0071] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A back sheet for a photovoltaic module, characterized in that: It includes a main body, a mounting portion and a fixing portion, wherein the mounting portion and the fixing portion are respectively arranged on opposite sides of the main body, and the mounting portion is provided with a mounting groove for mounting a battery module, and the groove depth of the mounting groove is less than or equal to the thickness of the battery module.

2. The back plate according to claim 1, characterized in that: A first liquid flow channel is provided in the main body, and a straight line where an extension direction of the first liquid flow channel is located is parallel to a plane where the battery module is located.

3. The back plate according to claim 2, characterized in that: In the thickness direction of the back plate, the first liquid flow channel is provided with multiple layers, and the liquid flow directions in two adjacent layers of the first liquid flow channel are opposite; and / or, In the width direction of the back plate, a plurality of rows of the first liquid flow channels are provided, and the liquid flow directions in two adjacent rows of the first liquid flow channels are opposite.

4. The back plate according to claim 2, characterized in that: A second liquid flow channel is provided in the fixing portion, and the second liquid flow channel is communicated with the first liquid flow channel.

5. The back plate according to claim 4, characterized in that: In the thickness direction of the back plate, the cross section of the first liquid flow channel is any one of a honeycomb shape, an I-shape, a corrugated shape, a cylinder or a prism; and / or, In the thickness direction of the back plate, the cross section of the second liquid flow channel is any one of a honeycomb shape, an I-shape, a corrugated shape, a cylinder shape or a prism shape.

6. The back plate according to claim 1, characterized in that: In the thickness direction of the back plate, a ratio of the thickness of the body to the thickness of the mounting portion is 1-80.

7. The back plate according to claim 1, characterized in that: The fixing part includes a first fixing member and a second fixing member, both extending along the length direction of the back plate. The first fixing member and the second fixing member are relatively arranged in the width direction of the back plate, and are enclosed with the back side of the main body to form a fixing groove. The back plate is connected and fastened to the support frame through the fixing groove.

8. A photovoltaic module, characterized in that: It includes a battery module and a backplane as described in any one of claims 1 to 7, wherein the battery module is embedded in a mounting groove of the backplane, the battery module extends out of the mounting groove away from the backplane, or the battery module is flush with the top surface of the mounting groove on a side away from the backplane.

9. The photovoltaic module according to claim 8, characterized in that: The battery module comprises a front packaging material layer, a first adhesive film layer, a battery layer and a second adhesive film layer which are sequentially arranged along the thickness direction of the back plate, and the front packaging material layer is exposed from the back plate.

10. The photovoltaic module according to claim 9, characterized in that: The thickness of the front packaging material layer is 0.1 mm to 1.5 mm.

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