Photovoltaic module

Abstract

The utility model relates to the technical field of photovoltaic cells, and discloses a photovoltaic assembly. The photovoltaic module comprises a back plate, a battery cell, a first sealing element, a second sealing element and a bus bar, the back plate is provided with at least one lead-out hole, the battery cell is arranged on one side of the back plate, the first sealing element is clamped between the battery cell and the back plate, the first sealing element corresponds to the lead-out hole in position, and the coverage area of the first sealing element is larger than the cross sectional area of the lead-out hole. The second sealing element is arranged in the lead-out hole and is in sealing connection with the first sealing element, one end of the bus bar is electrically connected with the battery cell, and the other end of the bus bar sequentially penetrates through the first sealing element and the second sealing element and extends out of the lead-out hole. According to the utility model, the invasion path of water vapor is effectively prolonged through the first sealing element and the second sealing element, so that the invasion path of the water vapor extends in the horizontal direction, and the blocking effect on the water vapor is greatly enhanced.

Description

TECHNICAL FIELD

[0001] The utility model relates to photovoltaic cell technical field, concretely relates to photovoltaic module. BACKGROUND

[0002] In the photovoltaic field, perovskite photovoltaic cells are extremely sensitive to water vapor, and a small amount of water vapor can cause the cells to decompose and thus the module to fail. Currently, the industry uses high water-resistant butyl rubber of sufficient width to prevent external water vapor from invading for the edge sealing of perovskite cells.

[0003] As shown in the prior art, Figure 1 Some perovskite photovoltaic cells 4' need to be installed with a junction box 1', and the backboard 2' is provided with a lead-out hole 3' to realize the lead-out of the bus bar 5' of the perovskite photovoltaic cell 4' and connect the lead-out bus bar 5' with the terminal post 7' in the junction box 1'. In order to achieve the purpose of sealing and water resistance, butyl rubber 7' is usually filled in the lead-out hole 3'. However, this method has many defects. The height of the butyl rubber 7' in the lead-out hole is restricted by the thickness of the backboard 2', making it difficult to achieve the ideal state of water resistance. During the lamination process, the backboard 2' at the lead-out hole is prone to deformation. When the temperature changes, the stress changes, which further weakens the water resistance of the butyl rubber 6' at the lead-out hole 3'. UTILITY MODEL CONTENTS

[0004] Therefore, the utility model provides a photovoltaic module to solve the problem that the height of the butyl rubber in the lead-out hole is restricted by the thickness of the backboard, resulting in poor water resistance of the photovoltaic module.

[0005] In the first aspect, the utility model provides a photovoltaic module, comprising:

[0006] a backboard provided with at least one lead-out hole;

[0007] an electric core arranged on one side of the backboard;

[0008] a first sealing member arranged between the electric core and the backboard, the first sealing member corresponding to the position of the lead-out hole and the coverage area of the first sealing member being greater than the cross-sectional area of the lead-out hole;

[0009] a second sealing member arranged in the lead-out hole and sealingly connected with the first sealing member;

[0010] a bus bar having one end electrically connected with the electric core and the other end sequentially penetrating through the first sealing member and the second sealing member and extending out of the lead-out hole.

[0011] Beneficial effects: the photovoltaic module, the first sealing piece is clamped between the electric core and the back plate, and the second sealing piece is sealed in the lead-out hole, and the first sealing piece is sealed with the second sealing piece. When the lead-out bus bar is led out, one end of the bus bar is sequentially inserted through the first sealing piece and the second sealing piece, so that the end of the bus bar extends out of the lead-out hole. If the water vapor on the outside of the back plate wants to enter the inside of the back plate, the water vapor needs to pass through the second sealing piece and the first sealing piece in sequence. Since the first sealing piece corresponds to the position of the lead-out hole, and the coverage area of the first sealing piece is larger than the cross-sectional area of the lead-out hole, the first sealing piece and the second sealing piece effectively extend the invasion path of the water vapor, so that the water vapor invasion path extends horizontally, greatly enhancing the blocking effect of the water vapor. At the same time, since the first sealing piece and the second sealing piece are located inside the photovoltaic module, the size of the junction box and the installation interference do not need to be considered. Compared with the way of simply filling butyl rubber in the lead-out hole in the prior art, this structure design can better prevent water vapor from entering the inside of the module, reduce the risk of photovoltaic module failure caused by water vapor, and is especially suitable for perovskite photovoltaic cell modules which are sensitive to water vapor.

[0012] Due to the presence of the first sealing piece, the second sealing piece in the lead-out hole directly bears a large stress. Under the condition of temperature change, the influence of stress change on the sealing effect can be reduced, the risk of back plate deformation at the lead-out hole is reduced, the stability of the overall structure of the module is enhanced, and the reliable operation of the module under different environmental conditions is ensured.

[0013] In an optional embodiment, a water-blocking film is further included, which is arranged on the film layer of the electric core and clamped between the electric core and the first sealing piece.

[0014] Beneficial effects: the water-blocking film is arranged on the film layer of the electric core and clamped between the electric core and the first sealing piece, further increasing the barrier level of water vapor invasion. The water-blocking film can effectively prevent water vapor from penetrating through the tiny gap between the electric core and the first sealing piece, further reducing the risk of the photovoltaic module being affected by water vapor, and ensuring the long-term stable operation of the photovoltaic module.

[0015] In addition, the water-blocking film plays a role of isolation, preventing the first sealing piece from directly contacting the film layer of the electric core. In the case of temperature change, stress pulling caused by the difference in thermal expansion and cold shrinkage coefficients between the first sealing piece and the film layer of the electric core is avoided, thereby preventing damage such as film peeling of the film layer of the electric core, effectively protecting the integrity of the film layer of the electric core, maintaining the stable performance of the electric core, and ensuring the overall power generation efficiency of the module.

[0016] In an optional embodiment, the coverage area of the first sealing piece is within the coverage area of the water-blocking film.

[0017] Beneficial effect: when water vapor invades from the outside, the first sealing element is located in the water-blocking film, even if the water vapor is at the edge of the first sealing element, it must first pass through the water-blocking film to contact the battery core, further extending the water vapor invasion path, thereby maximizing the water-blocking performance of the water-blocking film, preventing water vapor from bypassing the first sealing element edge and other weak parts into the photovoltaic module, and further improving the overall water vapor barrier effect of the module.

[0018] In an optional embodiment, the bus bar includes a pasting segment and a leading-out segment connected to the pasting segment, the pasting segment is arranged at an angle with the leading-out segment, the pasting segment is arranged in the first sealing element, and the leading-out segment passes through the leading-out hole.

[0019] Beneficial effect: the pasting segment and the leading-out segment are arranged at an angle, which makes the layout of the bus bar in the photovoltaic module more flexible. The pasting segment is used to lead the current of the battery core from the electrode end to the leading-out hole, which can make full use of the space in the first sealing element. The leading-out segment can smoothly pass through the second sealing element and extend to the outside through the leading-out hole. The leading-out segment is used to lead the current out of the leading-out hole, which is conducive to the compact design of the internal structure of the photovoltaic module, and ensures that the bus bar can be smoothly led out of the leading-out hole under the premise of ensuring the waterproof performance of the photovoltaic module.

[0020] The pasting segment and the leading-out segment are arranged in the first sealing element and the second sealing element respectively, and the first sealing element and the second sealing element can fix and protect the pasting segment and the leading-out segment. During the production, transportation, installation and operation of the photovoltaic module, the risk of displacement, loosening or damage of the bus bar due to external force, vibration and other factors can be reduced, and the electrical connection between the bus bar and the battery core can be ensured to be stable and reliable. Compared with the conventional way of arranging the pasting segment and the leading-out segment on the back plate or the wall of the leading-out hole, the first sealing element and the second sealing element respectively wrap the pasting segment and the leading-out segment, which can prevent water vapor from penetrating from the contact surface of the bus bar to the inside.

[0021] In an optional embodiment, the pasting segment and the leading-out segment are perpendicular to each other.

[0022] Beneficial effect: the pasting segment and the leading-out segment are arranged perpendicular to each other, the pasting segment can be arranged horizontally, and the leading-out segment can be arranged vertically. In the internal area of the first sealing element, the pasting segment can be laid along a horizontal direction, so that the water vapor invasion path extends horizontally. The leading-out segment is arranged vertically to facilitate the leading-out segment to pass through the leading-out hole and facilitate the installation of the bus bar. At the same time, the pasting segment and the leading-out segment arranged perpendicular to each other increase the overall rigidity of the bus bar, and the vertical structure can better resist deformation and improve the reliability of the bus bar in the photovoltaic module.

[0023] In an alternative embodiment, the first sealing member comprises a first water-blocking sheet and a second water-blocking sheet arranged in a stack, the second water-blocking sheet is arranged between the first water-blocking sheet and the back plate, and the patch sealing member is arranged between the first water-blocking sheet and the second water-blocking sheet.

[0024] Beneficial effects: The first water-blocking sheet and the second water-blocking sheet arranged in a stack can facilitate the placement of components during the packaging of the photovoltaic module, and can improve the packaging efficiency. Moreover, the first water-blocking sheet and the second water-blocking sheet are placed in advance during packaging, which can ensure the accurate placement position of the first sealing member.

[0025] The patch sealing member is arranged between the first water-blocking sheet and the second water-blocking sheet, so as to facilitate the passage of the busbar through the first sealing member, while ensuring the reliable sealing between the busbar and the first sealing member.

[0026] In an alternative embodiment, the second water-blocking sheet is provided with through holes corresponding to the lead-out holes, and the through holes are adapted for the lead-out section of the busbar to pass through.

[0027] Beneficial effects: During assembly, the lead-out section of the busbar can pass through the through holes and extend to the outside of the lead-out holes, realizing accurate planning of the lead-out path of the busbar, so as to facilitate the lead-out of the lead-out section of the busbar from the lead-out holes, and improve the accuracy and efficiency of the assembly of the photovoltaic module.

[0028] In an alternative embodiment, the second sealing member is cured water-blocking glue; and / or, the first sealing member and the second sealing member are both cured water-blocking glue.

[0029] Beneficial effects: The second sealing member being cured water-blocking glue can tightly fill the space of the lead-out hole, forming a sealing structure highly adapted to the shape of the lead-out hole. It can effectively fill the tiny gaps and irregular surfaces in the hole, prevent water vapor from directly entering the inside of the module from the lead-out hole, and provide reliable sealing effect, ensuring effective isolation of the internal environment of the module from the external water vapor.

[0030] When both the first sealing member and the second sealing member are cured water-blocking glue, the consistency of the material performance helps to build a more cooperative sealing system, which can reduce the problem of stress concentration at the sealing interface caused by material differences, making the sealing structure more stable and reliable. At the same time, a coherent barrier is formed in terms of water vapor barrier, improving the overall water vapor barrier capability of the photovoltaic module. Moreover, by injecting water-blocking glue to form the first sealing member and the second sealing member, the busbar inside the first sealing member and the second sealing member can be better fixed and sealed, simplifying the assembly process of the photovoltaic module.

[0031] In an alternative embodiment, the first sealing member and the second sealing member are integrally formed.

[0032] Beneficial effect: One-piece forming eliminates the joint gap or connection interface between the first seal and the second seal, forming a continuous and complete sealing barrier. Water vapor cannot penetrate into the photovoltaic module from the connection between the seals, ensuring the tightness of the water vapor barrier. It can effectively prevent water vapor from diffusing into the photovoltaic module, greatly improve the moisture-proof performance of the photovoltaic module, and prolong the service life of the module.

[0033] The one-piece first seal and the second seal reduce the production process and enhance the overall strength of the first seal and the second seal.

[0034] In an alternative embodiment, the water vapor transmission rate of the water blocking film, the first seal and the second seal is less than 10g / m 2 / day.

[0035] Beneficial effect: Lower water vapor transmission rate makes the water blocking film, the first seal and the second seal extremely effective in blocking water vapor penetration. In the use environment of the photovoltaic module, even if exposed to humid air or high humidity conditions for a long time, a reliable barrier can be formed to prevent water vapor from entering the photovoltaic module. Ensure the long-term stability and performance reliability of the photovoltaic module, significantly prolong the service life of the module. BRIEF DESCRIPTION OF DRAWINGS

[0036] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiments or the prior art description. Obviously, the drawings described below are some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0037] Figure 1 A cross-sectional view of the connection of the perovskite photovoltaic cell and the terminal post in the terminal box in the prior art;

[0038] Figure 2 A cross-sectional view of a photovoltaic module according to an embodiment of the present application;

[0039] Figure 3 A production flowchart of a photovoltaic module according to an embodiment of the present application.

[0040] Explanation of reference signs:

[0041] Reference signs in the prior art:

[0042] Reference signs in the present application:

[0043] 1. Backplane; 101. Lead-out hole; 2. Battery cell; 201. Membrane layer; 3. First sealing member; 301. First water-blocking sheet; 302. Second water-blocking sheet; 3021. Through hole; 4. Second sealing member; 5. Busbar; 501. Application section; 502. Lead-out section; 6. Water-blocking film. DETAILED DESCRIPTION

[0044] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0045] In related technologies, such as Figure 1 As shown, some perovskite photovoltaic cells 4' need to be installed with a junction box 1', and a lead-out hole 3' is provided on the back panel 2' to enable the bus bar 5' of the perovskite photovoltaic cell 4' to be led out, and the led-out bus bar 5' is connected to the terminal 7' in the junction box 1'. In order to achieve the purpose of sealing and water blocking, the lead-out hole 3' is usually filled with butyl rubber 7'. However, this method has many defects. The height of the butyl rubber 7' in the lead-out hole is restricted by the thickness of the back panel 2', which makes it difficult to achieve the ideal water-blocking performance. During the lamination process, the back panel 2' is prone to deformation at the lead-out hole. When the temperature changes, the stress changes accordingly, which further weakens the water-blocking ability of the butyl rubber 6' at the lead-out hole 3'.

[0046] In order to solve the above technical problems, the following Figures 2 to 3 , describing the embodiments of the present utility model.

[0047] According to the embodiment of the present utility model, Figure 2 and Figure 3 As shown, a photovoltaic module is provided, including a back sheet 1, a battery cell 2, a first sealing member 3, a second sealing member 4 and a bus bar 5.

[0048] Specifically, if Figure 2 As shown, the back plate 1 is provided with a lead-out hole 101 , and there is at least one lead-out hole 101 .

[0049] Specifically, if Figure 2 As shown, the battery cell 2 is arranged on one side of the back plate 1 .

[0050] Specifically, if Figure 2 As shown, the first sealing member 3 is sandwiched between the battery cell 2 and the back plate 1 , and the first sealing member 3 is arranged corresponding to the position of the lead-out hole 101 . The coverage area of ​​the first sealing member 3 is larger than the cross-sectional area of ​​the lead-out hole 101 .

[0051] Specifically, as shown in Figure 2 The second sealing member 4 is arranged in the lead-out hole 101, and the second sealing member 4 is sealingly connected with the first sealing member 3.

[0052] Specifically, as shown in Figure 2 One end of the busbar 5 is electrically connected with the electric core 2, and the other end of the busbar 5 extends out of the lead-out hole 101 through the first sealing member 3 and the second sealing member 4 in sequence.

[0053] In this photovoltaic module, the first sealing member 3 is arranged between the electric core 2 and the backboard 1, and the second sealing member 4 is arranged in the lead-out hole 101. The first sealing member 3 is sealingly connected with the second sealing member 4. When the busbar 5 is led out, one end of the busbar 5 extends out of the lead-out hole 101 through the first sealing member 3 and the second sealing member 4 in sequence. If the water vapor outside the backboard 1 enters the inside of the backboard 1, the water vapor needs to pass through the second sealing member 4 and the first sealing member 3 in sequence. Since the first sealing member 3 corresponds to the position of the lead-out hole 101, and the coverage area of the first sealing member 3 is larger than the cross-sectional area of the lead-out hole 101, the first sealing member 3 and the second sealing member 4 effectively extend the invasion path of the water vapor, so that the invasion path of the water vapor extends in the horizontal direction, and the blocking effect of the water vapor is greatly enhanced. At the same time, since the first sealing member 3 and the second sealing member 4 are located inside the photovoltaic module, the size of the junction box and the installation interference do not need to be considered. Compared with the way of simply filling butyl rubber in the lead-out hole 101 in the prior art, this structure design can better prevent water vapor from entering the inside of the module, reduce the risk of photovoltaic module failure caused by water vapor, and is especially suitable for perovskite photovoltaic cell modules which are sensitive to water vapor.

[0054] Due to the presence of the first sealing member 3, the second sealing member 4 in the lead-out hole 101 is avoided from directly bearing a large stress. In the case of temperature change, the influence of stress change on the sealing effect can be reduced, and the risk of deformation of the backboard 1 at the lead-out hole 101 is reduced, thereby enhancing the stability of the overall structure of the module and ensuring the reliable operation of the module under different environmental conditions.

[0055] Specifically, the electric core 2 includes a front plate glass and a film layer 201 arranged on the front plate. The film layer 201 is a thin film battery, such as a perovskite thin film battery, a copper indium gallium selenide thin film battery, a cadmium telluride thin film battery, etc. The electric core 2 can be a perovskite photovoltaic cell module, or other existing photovoltaic cells. In the embodiments of the present application, the type of the electric core 2 is not specifically limited.

[0056] Specifically, the backboard 1 can be made of glass or other transparent materials. In the embodiments of the present application, the material of the backboard 1 is not specifically limited.

[0057] Specifically, the backboard 1 can be provided with one lead-out hole 101, and the plurality of bus bars 5 of the electric core 2 are led out from the lead-out hole 101. The backboard 1 can also be provided with two lead-out holes 101, and the two bus bars 5 of the electric core 2 can be led out from the two lead-out holes 101 respectively. In the embodiment of the present application, the number of bus bars 5 and lead-out holes 101 is not specifically limited.

[0058] Specifically, the first sealing member 3 and the second sealing member 4 can be selected from water-blocking glue, and the material of the water-blocking glue includes butyl glue, polyurethane material, epoxy resin material, etc. In the embodiment of the present application, the type of the first sealing member 3 and the second sealing member 4 is not specifically limited.

[0059] In one embodiment, as shown in Figure 2 , a water-blocking film 6 is further included, and the water-blocking film 6 is covered on the film layer 201 of the electric core 2. The water-blocking film 6 is clamped between the electric core 2 and the first sealing member 3.

[0060] The water-blocking film 6 is covered on the film layer 201 of the electric core 2 and clamped between the electric core 2 and the first sealing member 3, further increasing the barrier level of water vapor intrusion. The water-blocking film 6 can effectively prevent water vapor from penetrating through the tiny gap between the electric core 2 and the first sealing member 3, further reducing the risk of the photovoltaic module being affected by water vapor inside, and ensuring the long-term stable operation of the photovoltaic module.

[0061] In addition, the water-blocking film 6 plays an isolation role to prevent the first sealing member 3 from directly contacting the film layer 201 of the electric core 2. In the case of temperature change, etc., the stress pulling caused by the difference in thermal expansion and contraction coefficients of the materials of the first sealing member 3 and the film layer 201 of the electric core 2 is avoided, thereby preventing damage such as film peeling of the film layer 201 of the electric core 2, effectively protecting the integrity of the film layer 201 of the electric core 2, maintaining the performance stability of the electric core 2, and ensuring the overall power generation efficiency of the module.

[0062] Specifically, the water-blocking film 6 can be selected from any existing water-blocking material such as PE / PVC / EVA / styrene-butadiene rubber, and chloroprene rubber, etc. In the embodiment of the present application, the material of the water-blocking film 6 is not specifically limited.

[0063] Specifically, the water-blocking film 6 can be provided in any existing shape such as square, rectangular, circular, etc. In the embodiment of the present application, the shape of the water-blocking film 6 is not specifically limited.

[0064] In one embodiment, as shown in Figure 2 and Figure 3 , the coverage area of the first sealing member 3 is located within the coverage area of the water-blocking film 6.

[0065] The coverage area of the first sealing member 3 is within the coverage area of the water-blocking film 6, so as to avoid the contact between the first sealing member 3 and the film layer 201, and avoid the discoloration or decomposition of the film layer 201 caused by the first sealing member 3 in some material categories.

[0066] When water vapor invades from the outside, since the first sealing member 3 is located within the water-blocking film 6, even if the water vapor is at the edge of the first sealing member 3, it must first pass through the water-blocking film 6 to contact the battery cell 2, further extending the water vapor invasion path, thereby maximizing the water-blocking performance of the water-blocking film 6, preventing water vapor from bypassing the edge of the first sealing member 3 and other weak parts to enter the inside of the photovoltaic module, and further improving the overall water vapor blocking effect of the module.

[0067] Specifically, the water-blocking performance requirements of the first sealing member 3 or the second sealing member 4 can be reduced by adjusting the size of the water-blocking film 6, and the selectivity of the first sealing member 3 or the second sealing member 4 can be increased.

[0068] In one embodiment, as shown in Figure 2 The busbar 5 includes a pasting segment 501 and a leading-out segment 502, the leading-out segment 502 is connected with the pasting segment 501, and the pasting segment 501 and the leading-out segment 502 are arranged at an angle. The pasting segment 501 is arranged in the first sealing member 3, and the leading-out segment 502 passes through the second sealing member 4 and out of the leading-out hole 101.

[0069] The angle arrangement of the pasting segment 501 and the leading-out segment 502 makes the layout of the busbar 5 in the photovoltaic module more flexible. The pasting segment 501 is used to lead the current of the battery cell 2 from the electrode end to the leading-out hole 101, which can fully utilize the space in the first sealing member 3, the leading-out segment 502 can smoothly pass through the second sealing member 4 and out of the leading-out hole 101 and extend to the outside, and the leading-out segment 502 is used to lead the current out of the leading-out hole 101, which is conducive to the compact design of the internal structure of the photovoltaic module, and ensures that the busbar 5 can be smoothly led out of the leading-out hole 101 under the premise of ensuring the waterproof performance of the photovoltaic module.

[0070] The pasting segment 501 and the leading-out segment 502 are arranged in the first sealing member 3 and the second sealing member 4 respectively, and the first sealing member 3 and the second sealing member 4 can fix and protect the pasting segment 501 and the leading-out segment 502. During the production, transportation, installation and operation of the photovoltaic module, the risk of displacement, loosening or damage of the busbar 5 due to external force, vibration and other factors can be reduced, and the electrical connection between the busbar 5 and the battery cell 2 can be ensured to be stable and reliable. Compared with the conventional way of arranging the pasting segment 501 and the leading-out segment 502 on the back plate 1 or the wall of the leading-out hole 101, the first sealing member 3 and the second sealing member 4 respectively wrap the pasting segment 501 and the leading-out segment 502, which can avoid the penetration of water vapor from the contact surface of the busbar 5 into the photovoltaic module.

[0071] In one embodiment, as shown in Figure 2 The application segment 501 and the lead-out segment 502 are arranged perpendicularly to each other.

[0072] The application segment 501 and the lead-out segment 502 are arranged perpendicularly to each other. The application segment 501 can be arranged horizontally, and the lead-out segment 502 can be arranged vertically. In the inner region of the first sealing member 3, the application segment 501 can be laid horizontally in a horizontal direction, so that the water vapor intrusion path extends horizontally. The lead-out segment 502 is arranged vertically, so as to be led out from the lead-out hole 101, facilitating the installation of the busbar 5. Meanwhile, the perpendicular arrangement of the application segment 501 and the lead-out segment 502 increases the overall rigidity of the busbar 5, and the vertical structure can better resist deformation, improving the reliability of the busbar 5 in the photovoltaic module.

[0073] In one embodiment, the first sealing member 3 comprises a first water-blocking sheet 301 and a second water-blocking sheet 302, and the first water-blocking sheet 301 and the second water-blocking sheet 302 are arranged in layers. The second water-blocking sheet 302 is arranged between the first water-blocking sheet 301 and the backboard 1, and the application segment 501 is sealingly arranged between the first water-blocking sheet 301 and the second water-blocking sheet 302.

[0074] The first water-blocking sheet 301 and the second water-blocking sheet 302 arranged in layers can facilitate the placement of components during encapsulation of the photovoltaic module, and can improve the encapsulation efficiency. Moreover, the first water-blocking sheet 301 and the second water-blocking sheet 302 are placed in advance during encapsulation, which can ensure the accurate placement position of the first sealing member 3. During thermal encapsulation of the photovoltaic module, the first water-blocking sheet 301 and the second water-blocking sheet 302 will be hot-melted into a colloidal state and will be bonded to each other after cooling.

[0075] The first water-blocking sheet 301 and the second water-blocking sheet 302 are preferably made of the same material, which has better bonding stability. The materials selected are butyl rubber, polyurethane, epoxy resin, POE, EVA, etc.

[0076] The application segment 501 is sealingly arranged between the first water-blocking sheet 301 and the second water-blocking sheet 302, so as to facilitate the passage of the busbar 5 through the first sealing member 3, while ensuring the sealing reliability between the busbar 5 and the first sealing member 3.

[0077] In one embodiment, as shown in Figure 3 The second water-blocking sheet 302 is provided with a through hole 3021, and the through hole 3021 is arranged one-to-one with the lead-out hole 101. The through hole 3021 is adapted to be penetrated by the lead-out segment 502.

[0078] In the assembly process, the lead-out section 502 of the busbar 5 can pass through the through hole 3021 and extend to the outside of the lead-out hole 101, realizing accurate planning of the lead-out path of the busbar 5, so as to facilitate the lead-out of the lead-out section 502 of the busbar 5 from the lead-out hole 101, and improving the accuracy and efficiency of the assembly of the photovoltaic module.

[0079] Specifically, the through hole 3021 can be provided in any shape such as a square hole, a polygonal hole or a circular hole, and in the embodiment of the present application, the shape of the through hole 3021 is not specifically limited, and the shape is preferably matched with the lead-out section of the busbar.

[0080] In one embodiment, the second sealing member 4 is a cured water-blocking glue. And / or, the first sealing member 3 and the second sealing member 4 are both cured water-blocking glue.

[0081] The second sealing member 4 being a cured water-blocking glue can tightly fill the space of the lead-out hole 101, forming a sealing structure highly matched with the shape of the lead-out hole 101. It can effectively fill the tiny gaps and irregular surfaces in the hole, prevent water vapor from directly entering the inside of the module from the lead-out hole 101, provide reliable sealing effect, and ensure effective isolation of the internal environment of the module from the external water vapor.

[0082] When the first sealing member 3 and the second sealing member 4 are both cured water-blocking glue, the consistency of the material performance helps to build a more cooperative sealing system, which can reduce the problem of stress concentration at the sealing interface caused by material differences, making the sealing structure more stable and reliable. At the same time, a coherent barrier is formed in terms of water vapor barrier, improving the overall water vapor barrier capability of the photovoltaic module. And by injecting water-blocking glue to form the first sealing member 3 and the second sealing member 4, the busbar 5 inside the first sealing member 3 and the second sealing member 4 can be better fixed, simplifying the assembly process of the photovoltaic module.

[0083] Specifically, the water-blocking glue can be butyl glue.

[0084] In one embodiment, the first sealing member 3 and the second sealing member 4 are integrally formed.

[0085] The integral forming eliminates the joint gaps or connection interfaces between the first sealing member 3 and the second sealing member 4, forming a continuous and complete sealing barrier. Water vapor cannot penetrate into the inside of the photovoltaic module from the connection between the sealing members, ensuring the tightness of the water vapor barrier. It can effectively prevent water vapor from diffusing into the inside of the photovoltaic module, greatly improving the moisture-proof performance of the photovoltaic module and prolonging the service life of the module.

[0086] The integrally formed first sealing member 3 and the second sealing member 4 reduce the production process and enhance the overall strength of the first sealing member 3 and the second sealing member 4.

[0087] In one embodiment, the water vapor transmission rate of the water barrier film 6, the first seal 3 and the second seal 4 are all less than 10 g / m 2 / day (85℃, 100% humidity).

[0088] The lower water vapor transmission rate enables the water barrier film 6, the first seal 3 and the second seal 4 to effectively block the penetration of water vapor. In the use environment of the photovoltaic module, a reliable barrier is formed to prevent water vapor from entering the interior of the photovoltaic module even if exposed to humid air or high humidity conditions for a long time. The long-term stability and performance reliability of the photovoltaic module are ensured, and the service life of the module is significantly prolonged.

[0089] The assembly process of the photovoltaic module in the embodiment is described as follows:

[0090] Embodiment 1. Manual assembly operation flow:

[0091] As shown in Figure 3 , first, the water barrier film 6 is placed on the film layer 201 of the cell 2, then the first water barrier sheet 301 is placed on the water barrier film 6, subsequently the affixed section 501 of the busbar 5 is placed on the first water barrier sheet 301, and then the second water barrier sheet 302 is placed on the first water barrier sheet 301, so that the affixed section 501 is clamped between the first water barrier sheet 301 and the second water barrier sheet 302. In addition, the backboard 1 is covered on the second water barrier sheet 302, so that the lead-out hole 101 on the backboard 1 corresponds to the position of the through hole 3021, and the lead-out section 502 is passed through the through hole 3021 and the lead-out hole 101, and then the whole assembly is placed on a laminator for heating and laminating, the first water barrier sheet 301 and the second water barrier sheet 302 are hot-melted into a colloidal state, and the photovoltaic module is taken out when not completely cooled or after completely cooled. Finally, the second seal 4 is injected into the lead-out hole 101 and seals the lead-out hole 101, and the second seal 4 is sealingly connected with the second water barrier sheet 302.

[0092] Embodiment 2. Semi-automatic assembly operation flow:

[0093] First, the water barrier film 6 is placed on the film layer 201 of the cell 2, then the busbar 5 is placed on the water barrier film 6, subsequently the backboard 1 is covered, and the lead-out section 502 of the busbar 5 is passed out of the lead-out hole 101, the water barrier glue is injected into the lead-out hole 101, and after the water barrier glue is cured, the water barrier glue forms the second seal 4 in the lead-out hole 101, and the first seal 3 is formed between the water barrier film 6 and the backboard 1.

[0094] Although the embodiments of the present application are described in conjunction with the drawings, various modifications and changes can be made by those skilled in the art without departing from the spirit and scope of the present application, and such modifications and changes fall within the scope defined by the appended claims.

Claims

1. A photovoltaic module, characterized by, The application relates to a battery cell, which comprises the following parts: a back plate (1) provided with at least one lead-out hole (101); an electric core (2) arranged on one side of the back plate (1); a first sealing member (3) arranged between the electric core (2) and the back plate (1), wherein the first sealing member (3) corresponds to the position of the lead-out hole (101) and the covering area of the first sealing member (3) is larger than the cross-sectional area of the lead-out hole (101); a second sealing member (4) arranged in the lead-out hole (101) and sealedly connected with the first sealing member (3); a bus bar (5) electrically connected with one end of the electric core (2) and sequentially penetrating through the first sealing member (3) and the second sealing member (4) and extending out of the lead-out hole (101).

2. The photovoltaic module of claim 1, wherein, The battery cell further comprises a water-blocking film (6) arranged on a film layer (201) of the electric core (2) and arranged between the electric core (2) and the first sealing member (3).

3. The photovoltaic module of claim 2, wherein, The covering area of the first sealing member (3) is located in the covering area of the water-blocking film (6).

4. The photovoltaic module of claim 1, wherein, The bus bar (5) comprises a sticking segment (501) and a lead-out segment (502) connected with the sticking segment (501), the sticking segment (501) and the lead-out segment (502) are arranged at an angle, the sticking segment (501) is arranged in the first sealing member (3), and the lead-out segment (502) penetrates through the lead-out hole (101).

5. The photovoltaic module of claim 4, wherein, The sticking segment (501) and the lead-out segment (502) are perpendicular to each other.

6. The photovoltaic module of claim 4, wherein, The first sealing member (3) comprises a first water-blocking sheet (301) and a second water-blocking sheet (302) arranged in layers, the second water-blocking sheet (302) is arranged between the first water-blocking sheet (301) and the back plate (1), and the sticking segment (501) is sealingly arranged between the first water-blocking sheet (301) and the second water-blocking sheet (302).

7. The photovoltaic module of claim 6, wherein, The second water-blocking sheet (302) is provided with a through hole (3021) corresponding to the lead-out hole (101), and the through hole (3021) is adapted to allow the lead-out segment (502) to penetrate.

8. The photovoltaic module according to any of claims 1 to 7, characterized in that, The second sealing member (4) is water-blocking glue after solidification; and / or the first sealing member (3) and the second sealing member (4) are both water-blocking glue after solidification.

9. The photovoltaic module according to any of claims 1 to 7, characterized in that, The first sealing member (3) and the second sealing member (4) are integrally formed.

10. The photovoltaic module of claim 2, wherein, The water vapor transmission rate of the water barrier film (6), the first seal (3) and the second seal (4) are all less than 10 g / m 2 / day.

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