A heterojunction cell module packaging structure

Abstract

The utility model relates to a heterojunction battery technical field, specific, relate to a kind of heterojunction battery assembly packaging structure, including packaging frame, the inside embedding of packaging frame is provided with battery body, the battery body sequentially includes N type silicon substrate, intrinsic hydrogenated amorphous silicon film layer one, P type hydrogenated amorphous silicon layer, intrinsic hydrogenated amorphous silicon film layer two, N type hydrogenated amorphous silicon layer, the both sides of N type silicon substrate are provided with P type hydrogenated amorphous silicon layer and N type hydrogenated amorphous silicon layer respectively, intrinsic hydrogenated amorphous silicon film layer one is inlaid between N type silicon substrate and P type hydrogenated amorphous silicon layer and is set with.The scheme is through covering the anti-dazzle glass layer with microcosmic rough surface on the light-receiving surface of battery, effectively reduces the mirror reflection of direct light using diffuse reflection principle, which not only avoids the visual glare phenomenon, improves the aesthetic and the comfort of human eye observation when installed on building.

Description

Technical Field

[0001] This utility model relates to the field of heterojunction battery technology, and more specifically, to a heterojunction battery module packaging structure. Background Technology

[0002] With the accelerated transformation of the global energy structure, photovoltaic power generation, as an important component of clean energy, has attracted increasing attention for its technological iteration and market application. Traditional photovoltaic modules still have many limitations in terms of efficiency, stability, aesthetics, and environmental adaptability, which restricts their promotion and application in high-value-added scenarios such as building-integrated photovoltaics and urban distributed photovoltaics.

[0003] Traditional PERC cell conversion efficiency has approached its theoretical limit, making it difficult to meet the market's demand for higher power generation. Especially with limited installation area, improving power generation efficiency per unit area has become crucial. P-type crystalline silicon modules suffer from significant light-induced degradation due to boron-oxygen recombination, affecting the long-term power generation revenue and reliability of power plants.

[0004] Meanwhile, conventional modules have a high temperature coefficient, which significantly reduces power generation efficiency in high-temperature environments, limiting their application potential in hot regions such as tropics and deserts. Ordinary modules have a monotonous appearance and strong reflection, which can easily cause light pollution and make it difficult to achieve aesthetic integration with modern building facades or high-end commercial buildings. Furthermore, traditional single-sided modules cannot make full use of ground reflected light and diffused light, resulting in limited power generation gain and limiting their application value in complex lighting environments. Utility Model Content

[0005] To overcome the above deficiencies, this utility model provides a solution that overcomes or at least partially solves the above technical problems.

[0006] This utility model provides a heterojunction battery module packaging structure, including a packaging frame, in which a battery body is embedded. The battery body sequentially comprises an N-type silicon substrate, an intrinsic hydrogenated amorphous silicon thin film layer one, a P-type hydrogenated amorphous silicon layer, an intrinsic hydrogenated amorphous silicon thin film layer two, and an N-type hydrogenated amorphous silicon layer. A P-type hydrogenated amorphous silicon layer and an N-type hydrogenated amorphous silicon layer are respectively disposed on both sides of the N-type silicon substrate. An intrinsic hydrogenated amorphous silicon thin film layer one is bonded between the N-type silicon substrate and the P-type hydrogenated amorphous silicon layer, and an intrinsic hydrogenated amorphous silicon thin film layer two is bonded between the N-type silicon substrate and the N-type hydrogenated amorphous silicon layer. Both the P-type hydrogenated amorphous silicon layer and the N-type hydrogenated amorphous silicon layer are covered with an anti-glare glass layer on their outward-facing sides. The surface of the anti-glare glass layer has a micro-rough structure, and the outward-facing side of the anti-glare glass layer is also covered with a TCO thin film layer.

[0007] Preferably, a positioning frame is provided on the outside of the packaging frame, and a notch is provided on the bottom inner side of the positioning frame. A bearing is embedded and fixed inside the notch, and a shaft is installed on the inner ring wall of the bearing with an interference fit. The shaft is located at the lower center of the packaging frame.

[0008] Preferably, a bearing 2 is fixed through the upper end of the positioning frame, and a shaft 2 is inserted through and interference-fitted into the inner ring wall of the bearing 2, with the shaft 2 positioned at the upper center of the packaging frame.

[0009] Preferably, a motor is fixedly mounted on the upper end of the positioning frame by a bracket, and the motor has a rotating shaft for driving inside, and the end of the rotating shaft is fixedly connected to the shaft two by a coupling.

[0010] Preferably, both the ends of the first shaft and the second shaft are fixedly installed with connecting seats. Both connecting seats are L-shaped structures, and the encapsulation frame is slidably fitted to the corresponding connecting seats at the top and bottom positions along one side.

[0011] Preferably, an inner sleeve is embedded and fixed inside the connector, and a threaded post corresponding to the position of the inner sleeve is fixed on the encapsulation frame, with the surface of the threaded post slidingly engaging with the inside of the inner sleeve.

[0012] Preferably, a threaded cap is threaded onto the end of the threaded column, and one end of the threaded cap is tightly fitted against the end face of the inner sleeve.

[0013] Preferably, the lower end of the positioning frame is symmetrically fixed with feet on both sides, and the surface of the feet has two through-holes, the inner wall of which is smooth or threaded.

[0014] The targeted solution provided by this utility model has the following beneficial effects: 1. This solution fundamentally avoids the performance degradation problem caused by boron-oxygen recombination in traditional P-type silicon by using a high-purity, low-defect N-type monocrystalline silicon substrate as the core light-absorbing layer and carrier transport substrate. This significantly improves the stability and lifespan of the battery module during long-term operation. Intrinsic hydrogenated amorphous silicon thin film layers are integrated on both sides of the N-type silicon substrate. These undoped thin film layers have excellent interface passivation characteristics, which can effectively suppress carrier recombination loss at the interface, thereby improving the open-circuit voltage and overall photoelectric conversion efficiency of the battery. At the same time, the outer P-type and N-type hydrogenated amorphous silicon layers together with the substrate form a high-efficiency heterojunction, forming a strong built-in electric field, which ensures that photogenerated carriers can be effectively separated and collected. This is the core mechanism for achieving high-efficiency power generation of the battery. 2. This solution effectively reduces specular reflection of direct light by covering the light-receiving surface of the battery with an anti-glare glass layer with a micro-rough surface, utilizing the principle of diffuse reflection. This not only avoids visual glare and improves the aesthetics and visual comfort when installed on buildings, but also ensures that most incident light can efficiently enter the active layer inside the battery, thus not affecting its power generation efficiency. A transparent conductive oxide film layer is also covered on top of the anti-glare glass layer. This film layer has both excellent light transmittance and conductivity, which can collect current and conduct it to the electrodes, and further improve the light absorption efficiency. Moreover, due to its conductivity, it avoids the potential-induced decay problem caused by the insulating layer, further enhancing the long-term reliability of the component. 3. This solution uses a positioning frame system driven by a motor, with the upper and lower bearings supporting the shaft to connect the packaging frame, so that the entire battery assembly can rotate stably around the axis. The equipped brake motor and servo controller can precisely control the battery assembly to adjust its orientation according to the changes in the angle of sunlight according to the parameters set by the terminal, thereby maximizing the capture of light energy. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0016] Figure 1 This is a disassembled diagram of the heterojunction battery structure provided in this embodiment of the utility model; Figure 2 A front view of the positioning frame and the packaging frame provided for an embodiment of this utility model; Figure 3 A schematic diagram of the back of the positioning frame and the packaging frame provided for an embodiment of this utility model; Figure 4 Provided for the embodiments of this utility model Figure 3 Enlarged diagram of point A.

[0017] In the diagram: 1. Encapsulation frame; 11. Battery body; 101. N-type silicon substrate; 102. Intrinsic hydrogenated amorphous silicon thin film layer one; 103. P-type hydrogenated amorphous silicon layer; 104. Intrinsic hydrogenated amorphous silicon thin film layer two; 105. N-type hydrogenated amorphous silicon layer; 106. Anti-glare glass layer; 107. TCO thin film layer; 2. Positioning frame; 21. Bearing one; 22. Shaft one; 23. Bearing two; 24. Shaft two; 25. Motor; 201. Connecting seat; 202. Threaded post; 203. Internal sleeve; 204. Threaded cap; 3. Foot; 31. Mounting hole. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model. Example

[0019] Reference Figures 1-4This utility model provides a technical solution: a heterojunction battery module packaging structure, including a packaging frame 1, with a battery body 10 embedded inside the packaging frame 1. The battery body 10 sequentially includes an N-type silicon substrate 101, an intrinsic hydrogenated amorphous silicon thin film layer 102, a P-type hydrogenated amorphous silicon layer 103, an intrinsic hydrogenated amorphous silicon thin film layer 104, and an N-type hydrogenated amorphous silicon layer 105. The P-type hydrogenated amorphous silicon layer 103 and the N-type hydrogenated amorphous silicon layer 105 are respectively disposed on both sides of the N-type silicon substrate 101. The intrinsic hydrogenated amorphous silicon thin film layer 102 is bonded between the N-type silicon substrate 101 and the P-type hydrogenated amorphous silicon layer 103, and the intrinsic hydrogenated amorphous silicon thin film layer 104 is bonded between the N-type silicon substrate 101 and the N-type hydrogenated amorphous silicon layer 105. The N-type silicon substrate 101 uses N-type monocrystalline silicon as the substrate, which has high purity, low defect density, and high current carrying capacity. With advantages such as long lifespan, the N-type silicon substrate 101, serving as the main light-absorbing layer and carrier transport substrate of the battery, avoids the boron-oxygen recombination common in P-type silicon, ensuring high stability and long lifespan of the module. The intrinsic hydrogenated amorphous silicon thin film layer 102 and the intrinsic hydrogenated amorphous silicon thin film layer 104 are both undoped hydrogenated amorphous silicon (a-Si:H) films with excellent interface passivation characteristics. Located between the N-type silicon substrate 101 and the doped layer, they play an interface passivation role, effectively reducing carrier recombination at the interface and improving open-circuit voltage and conversion efficiency. The P-type hydrogenated amorphous silicon layer 103 and the N-type hydrogenated amorphous silicon layer 105 are boron-doped P-type a-Si:H and phosphorus-doped N-type a-Si:H, respectively, forming a heterojunction structure with the substrate, constructing a built-in electric field, and realizing the effective separation and collection of photogenerated carriers. This is the core structure for high-efficiency power generation of heterojunction batteries. Both the P-type hydrogenated amorphous silicon layer 103 and the N-type hydrogenated amorphous silicon layer 105 are covered with an anti-glare glass layer 106 on their outward-facing sides. The surface of the anti-glare glass layer 106 has a micro-rough structure. The outward-facing side of the anti-glare glass layer 106 is also covered with a TCO thin film layer 107. The anti-glare glass layer 106 is made of high-transmittance glass, and its surface is formed with a micro-rough structure through chemical etching or physical deposition. It reduces the reflection of direct light through the principle of diffuse reflection, avoids visual glare, improves the aesthetics of the building and the comfort of the human eye, and ensures that light is efficiently incident on the battery active layer without affecting the power generation efficiency. The TCO thin film layer 107 is a transparent conductive oxide with both high transmittance and conductivity. It can collect charge carriers and conduct them to the electrodes, improve the light absorption efficiency, and avoids potential-induced decay without the obstruction of an insulating layer, thus improving long-term reliability.

[0020] The outer side of the encapsulation frame 1 is provided with a positioning frame 2. The bottom inner side of the positioning frame 2 has a notch, and a bearing 21 is embedded and fixed inside the notch. A shaft 22 is installed on the inner ring wall of the bearing 21 with an interference fit. The shaft 22 is located at the lower center of the encapsulation frame 1. The shaft 22 can rotate based on the bearing 21, so that the lower position of the encapsulation frame 1 can be kept stable when rotating with the battery body 10.

[0021] The upper end of the positioning frame 2 is fixed with a bearing 23, and a shaft 24 is inserted through and interference-fitted into the inner ring wall of the bearing 23. The shaft 24 is located at the upper center of the packaging frame 1. The shaft 24 can rotate based on the bearing 23, so that the upper position of the packaging frame 1 can be kept stable when rotating with the battery body 10.

[0022] The upper end of the positioning frame 2 is fixedly mounted with a motor 25 by a bracket. The motor 25 has a rotating shaft inside for driving, and the end of the rotating shaft is fixedly connected to the shaft 24 by a coupling. The motor 25 is a brake motor, which has the effect of braking after power failure. It is also equipped with a servo controller, which can be set by the terminal to drive the motor 25 to rotate according to the specified requirements, and the rotating shaft can drive the shaft 24 to drive the battery body 10 to adjust according to the light angle.

[0023] Among them, the ends of shaft 1 22 and shaft 24 are both fixedly installed with connecting seats 201. Both connecting seats 201 are L-shaped structures. The upper and lower positions of the encapsulation frame 1 are slidably attached to the corresponding connecting seats 201 along one side. When the encapsulation frame 1 and the positioning frame 2 are installed, the upper and lower connecting seats 201 can slide and attach to the encapsulation frame 1 to quickly position the upper and lower positions.

[0024] The connector 201 has an embedded sleeve 203 fixed inside, and the encapsulation frame 1 has a threaded post 202 corresponding to the position of the embedded sleeve 203. The surface of the threaded post 202 is slidably sleeved with the inside of the embedded sleeve 203. By passing through the embedded sleeve 203 through the threaded post 202, the overall positioning of the encapsulation frame 1 and the positioning frame 2 can be quickly achieved.

[0025] The threaded post 202 is threaded with a threaded cap 204 at its end. One end of the threaded cap 204 is tightly attached to the end face of the inner sleeve 203. When it is necessary to disassemble and recycle the battery body 10 for protection, the threaded cap 204 can be manually twisted to separate the threaded cap 204 from the threaded post 202, thereby enabling the disassembly of the encapsulation frame 1 and the positioning frame 2.

[0026] The lower end of the positioning frame 2 is symmetrically fixed with feet 3 on both sides. The surface of the feet 3 has two mounting holes 31 that penetrate through it. The inner wall of the mounting holes 31 is smooth or threaded. When the battery body 10 receives light from both sides to generate electricity, it can only be placed on the ground on an open roof. The feet 3 can ensure the stability of the positioning frame 2 on the ground. The mounting holes 31 are connected by screws or bolts to ensure the stable assembly of the feet 3 with the ground.

[0027] In practical implementation: The N-type silicon substrate 101 serves as the main light-absorbing layer, generating electron-hole pairs under illumination. Its high purity and low defect density ensure a long lifetime for photogenerated carriers, laying the foundation for efficient collection. The key step lies in interface passivation, accomplished by intrinsic hydrogenated amorphous silicon thin film layer one 102 and intrinsic hydrogenated amorphous silicon thin film layer two 104. These two undoped hydrogenated amorphous silicon thin films are tightly bonded to both sides of the N-type silicon substrate 101, perfectly passivating the interface between the N-type silicon substrate 101 and subsequent doped layers. This significantly reduces recombination losses of photogenerated carriers at the interface, thereby significantly improving efficiency. The open-circuit voltage of the battery is then determined. Subsequently, the P-type hydrogenated amorphous silicon layer 103 and the N-type hydrogenated amorphous silicon layer 105 together with the N-type silicon substrate 101 form a heterojunction, creating a built-in electric field. Under the action of the built-in electric field, photogenerated electrons and holes are effectively separated. Electrons flow to the N-type hydrogenated amorphous silicon layer 105, and holes flow to the P-type hydrogenated amorphous silicon layer 103. The separated charge carriers are collected by the TCO thin film layer 107 covering the outside of the doped layer and laterally conducted to the electrode, ultimately forming a current output. Throughout the process, the anti-glare glass layer 106 ensures that light is efficiently incident in the form of diffuse reflection, reducing reflection loss and jointly ensuring the high conversion efficiency of the battery. Motor 25 is a brake motor that can receive commands from a servo controller to rotate precisely at an angle. When the system determines that the illumination angle has changed, motor 25 starts, and its shaft directly drives the fixed shaft 24 to rotate via a coupling. Shaft 24 passes through and is fixed to the inner ring of bearing 23, thus allowing smooth rotation. Meanwhile, on the inner bottom of the positioning frame 2, shaft 22 is installed via bearing 21. Both shaft 22 and shaft 24 have L-shaped connecting seats 201 fixed to their ends. The upper and lower sides of the encapsulation frame 1 slide with these two connecting seats 201. The components fit together and slide into the inner sleeve 203 embedded in the connector 201 via the threaded post 202, and are finally secured with the threaded cap 204. This design allows the torque to be transmitted to the entire encapsulation frame 1 through the connector 201 and the threaded post 202 when the motor 25 drives the shaft 24 to rotate. This causes the battery body 10 inside to rotate smoothly around the axis formed by the shaft 1 22 and the shaft 24. The bearing 1 21 and the bearing 23 work together to ensure the stability and low friction of the rotation process, so that the battery body 10 can be accurately aligned with the direct sunlight and maximize the light energy input.

[0028] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A heterojunction battery module encapsulation structure, comprising an encapsulation frame (1), characterized in that: The battery body (10) is embedded inside the encapsulation frame (1). The battery body (10) sequentially includes an N-type silicon substrate (101), an intrinsic hydrogenated amorphous silicon thin film layer one (102), a P-type hydrogenated amorphous silicon layer (103), an intrinsic hydrogenated amorphous silicon thin film layer two (104), and an N-type hydrogenated amorphous silicon layer (105). The P-type hydrogenated amorphous silicon layer (103) and the N-type hydrogenated amorphous silicon layer (105) are respectively disposed on both sides of the N-type silicon substrate (101). An intrinsic hydrogenated amorphous silicon thin film layer one (102) is bonded between the N-type silicon substrate (101) and the P-type hydrogenated amorphous silicon layer (103). An intrinsic hydrogenated amorphous silicon thin film layer two (104) is bonded between the N-type silicon substrate (101) and the N-type hydrogenated amorphous silicon layer (105). The outer side of both the P-type hydrogenated amorphous silicon layer (103) and the N-type hydrogenated amorphous silicon layer (105) is covered with an anti-glare glass layer (106). The surface of the anti-glare glass layer (106) has a micro-rough structure. The outer side of the anti-glare glass layer (106) is also covered with a TCO thin film layer (107).

2. The heterojunction battery module packaging structure according to claim 1, characterized in that: The outer side of the encapsulation frame (1) is provided with a positioning frame (2). The bottom of the inner side of the positioning frame (2) is provided with a notch, and a bearing (21) is embedded and fixed inside the notch. A shaft (22) is installed on the inner ring wall of the bearing (21) with an interference fit. The shaft (22) is located at the lower center of the encapsulation frame (1).

3. The heterojunction battery module encapsulation structure according to claim 2, characterized in that: The upper end of the positioning frame (2) is fixed with a bearing two (23), and a shaft two (24) is inserted through and interference-fitted on the inner ring wall of the bearing two (23). The shaft two (24) is located at the upper center of the packaging frame (1).

4. The heterojunction battery module encapsulation structure according to claim 3, characterized in that: The upper end of the positioning frame (2) is fixedly mounted with a motor (25) by a bracket. The motor (25) has a rotating shaft for driving inside, and the end of the rotating shaft is fixedly connected to the shaft rod (24) by a coupling.

5. The heterojunction battery module packaging structure according to claim 4, characterized in that: Both the end of shaft one (22) and the end of shaft two (24) are fixedly installed with connecting seats (201). Both connecting seats (201) are L-shaped structures. The encapsulation frame (1) is slidably fitted to the corresponding connecting seat (201) along one side of the upper and lower positions.

6. The heterojunction battery module packaging structure according to claim 5, characterized in that: The connector (201) has an embedded sleeve (203) fixed inside, and a threaded post (202) corresponding to the position of the embedded sleeve (203) is fixed on the encapsulation frame (1). The surface of the threaded post (202) is slidably connected to the inside of the embedded sleeve (203).

7. The heterojunction battery module encapsulation structure according to claim 6, characterized in that: The threaded post (202) is threaded with a threaded cap (204) at one end, and one end of the threaded cap (204) is tightly attached to the end face of the inner sleeve (203).

8. The heterojunction battery module packaging structure according to claim 7, characterized in that: The lower end of the positioning frame (2) is symmetrically distributed with base feet (3) on both sides. The surface of the base feet (3) has two mounting holes (31) that penetrate through it. The inner wall of the mounting holes (31) is smooth or threaded.

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