Photovoltaic cell module

Abstract

The utility model relates to the technical field of batteries, and discloses a photovoltaic battery assembly, which comprises a first back plate, a second back plate and a battery cell, the first back plate and the second back plate are arranged at an interval to form an interval space, the interval space comprises a packaging area and a lead-out area, the battery cell is installed in the packaging area, a lead-out hole is formed in the part, corresponding to the lead-out area, of the first back plate, and the conductive part is led out through the lead-out hole; a first packaging structure filled with an adhesive is arranged on the periphery of the interval space in a surrounding mode, a second packaging structure filled with a drying agent is arranged on the periphery of the packaging area in a surrounding mode, and the first packaging structure is located on the outer side of the second packaging structure. According to the utility model, the use of a POE (Polyolefin Elastomer) adhesive film is canceled, a better sealing and waterproof effect is achieved by utilizing the first packaging structure and the second packaging structure, so that the use of a high-temperature laminating process is avoided, and the risk that external water vapor permeates into the battery cell through the lead-out hole is reduced by dividing the interval space into the packaging area (used for installing the battery cell) and the lead-out area.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to photovoltaic cell modules. Background Technology

[0002] In related technologies, perovskite solar cells have achieved efficiencies comparable to crystalline silicon modules after more than a decade of development. Current encapsulation technologies include: sealing the module edges with a sealing material (such as butyl rubber); leading conductive components directly from the cell to the outside through simple perforations; and using a single type of encapsulation material (such as POE film, short for Polyolefin Elastomer Film) inside the module for bonding and protection between the cell and the backsheet. Specifically, high-temperature lamination technology is used to tightly bond the various layers (including the cell and encapsulation materials). This process typically requires heating to melt certain encapsulation materials (such as POE film) to achieve bonding.

[0003] However, in traditional packaging structures, while high-temperature lamination can effectively bond the various layers of materials tightly, high temperatures can lead to compositional imbalances in some temperature-sensitive materials (such as perovskites), thus affecting battery stability and efficiency. Furthermore, because conductive components in existing structures are directly led out through simple perforations, external moisture can easily seep into the cell through these holes, impacting battery performance and lifespan. Utility Model Content

[0004] In view of this, the present invention provides a photovoltaic cell module to solve the problems of poor sealing performance and complex process of traditional packaging structures in related technologies.

[0005] In one aspect, the present invention provides a photovoltaic cell module, including a first backsheet, a second backsheet, and a cell;

[0006] The first backplate, the battery cell, and the second backplate are stacked sequentially, with the first backplate and the second backplate spaced apart to form a gap.

[0007] The spacer includes a packaging area and a lead-out area. The battery cell is installed in the packaging area. A through lead-out hole is provided on the first back plate corresponding to the lead-out area. The conductive components connected to the battery cell are led out to the outside of the spacer through the lead-out area and the lead-out hole in sequence.

[0008] A first encapsulation structure is provided around the outer periphery of the space, and an adhesive is provided inside the first encapsulation structure. A second encapsulation structure is provided around the outer periphery of the encapsulation area, and a desiccant is provided inside the second encapsulation structure. The first encapsulation structure is located outside the second encapsulation structure.

[0009] Beneficial effects: This invention divides the space into a packaging area (for installing the battery cell) and a lead-out area, and provides through-holes in the portion of the first backplate corresponding to the lead-out area, reducing the risk of external moisture seeping into the battery cell through the lead-out holes. The first packaging structure seals the entire battery assembly, and the second packaging structure provides secondary packaging for the outer periphery of the battery cell, preventing moisture from entering through the lead-out holes or the failure of the first packaging structure from affecting the battery cell, increasing resistance to water and oxygen intrusion, and improving the stability of the battery assembly.

[0010] In one optional embodiment, a third encapsulation structure is further provided between the encapsulation area and the lead-out area. The third encapsulation structure contains an adhesive and is located outside the first encapsulation structure and inside the second encapsulation structure.

[0011] Beneficial effects: The introduction of a third encapsulation structure further refines the zoning protection strategy for battery modules. It not only strengthens the barrier against moisture intrusion but also isolates the encapsulation area from the lead-out area, ensuring that even if moisture enters the lead-out area, it is difficult for it to penetrate into the encapsulation area and affect the safe and stable operation of the cell. This design adds another layer of safety to the entire encapsulation system, improving overall waterproof and moisture-proof capabilities, making it particularly suitable for battery types requiring high levels of protection.

[0012] In one alternative embodiment, a first annular protrusion is provided on the side surface of the first back plate facing the second back plate;

[0013] The first annular protrusion is arranged around the outer periphery of the first back plate, and the inner side of the first annular protrusion defines the first packaging structure.

[0014] Beneficial effects: On the one hand, by setting a first annular protrusion on the first backplate and utilizing the inner groove as the first encapsulation structure, the sealing performance of the entire assembly can be effectively improved. This structure can prevent moisture and other contaminants from entering the battery from the side. On the other hand, the first annular protrusion provides physical protection.

[0015] In one alternative embodiment, on a projection plane perpendicular to the second back plate, the top of the first annular protrusion rests on the outer peripheral wall of the second back plate.

[0016] A first gap is formed between the inner peripheral wall of the first annular protrusion and the outer peripheral wall of the second back plate. The first gap connects to the first packaging structure and is filled with adhesive.

[0017] Beneficial effects: By using a first annular protrusion at the edge of the first back plate to form an "L"-shaped groove structure between the first back plate and the second back plate, and filling it with adhesive, this utility model not only enhances the overall sealing and waterproof and moisture-proof performance of the component, but also significantly improves the stability and durability of the component by extending the moisture intrusion path.

[0018] In one optional embodiment, a second annular protrusion is further provided on the side surface of the first back plate facing the second back plate; the second annular protrusion is arranged around the outer periphery of the first back plate, the first annular protrusion is located outside the second annular protrusion, the first encapsulation structure is defined between the inner side of the first annular protrusion and the outer side of the second annular protrusion, and the second annular protrusion surrounds the outer side of the space.

[0019] Beneficial effects: The first and second annular protrusions work together to provide multi-layered physical protection. In particular, the second annular protrusion directly surrounds the outer side of the space (including the battery cell), ensuring that the battery cell 3 receives the most direct protection.

[0020] In one optional embodiment, an annular groove is provided on the side surface of the second back plate facing the first back plate. The annular groove is arranged around the outer periphery of the second back plate and corresponds to the position of the second annular protrusion. The second annular protrusion is fitted into the annular groove.

[0021] Beneficial effects: By embedding the second annular protrusion into the annular groove of the second backplate, a stable fit between the two backplates can be achieved, effectively preventing harmful substances such as external moisture and dust from entering the battery through any possible tiny gaps. Furthermore, the annular groove also assists in positioning and installation, while helping to evenly distribute stress within the component, reducing the risk of damage caused by localized stress concentration, thereby extending service life.

[0022] In one alternative embodiment, a third annular protrusion is further provided on the side surface of the first back plate facing the second back plate;

[0023] The third annular protrusion is located inside the first annular protrusion, and the outer side of the third annular protrusion defines the second packaging structure, with the third annular protrusion surrounding the outer side of the packaging area.

[0024] Beneficial effects: By adding a third annular protrusion to the first back plate and using the outer side of the third annular protrusion to define the second encapsulation structure, this utility model further improves the sealing and protection performance of the battery assembly.

[0025] In one alternative embodiment, at least a portion of the top of the third annular protrusion is spaced apart from the second back plate to define a second gap.

[0026] Beneficial effects: On the one hand, the second gap can prevent the third annular protrusion from touching the second back plate. On the other hand, since there is also an encapsulation film between the cell and the second back plate, the encapsulation film completely covers the cell. The second gap is used to leave height for the edge of the film, and it is also a channel for the encapsulation film to overflow outward during high-temperature lamination.

[0027] In one alternative embodiment, a first elongated protrusion is provided on the side surface of the first backplate facing the second backplate. The first elongated protrusion is located outside the third annular protrusion and inside the first annular protrusion. The outer side of the first elongated protrusion defines the third packaging structure.

[0028] Beneficial effects: By adding a first elongated protrusion to the first back plate, the third encapsulation structure can be defined by the outer side of the first elongated protrusion. This invention further realizes the effective separation between the lead-out area and the encapsulation area, improves the sealing of the encapsulation area, and thus enhances the protection of the battery cell.

[0029] In one optional embodiment, a gap is provided between the battery cell and the first backplane; or, at least an encapsulation layer is provided between the battery cell and the first backplane, the encapsulation layer being an encapsulation film or a cured liquid adhesive layer.

[0030] Beneficial effects: In one case, the structure without encapsulating film can achieve low-temperature encapsulation; in another case, the structure with encapsulating film, although requiring heat lamination, can increase water resistance, and when the encapsulating film is a cured liquid adhesive layer, it can also achieve the effect of low-temperature encapsulation. Attached Figure Description

[0031] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0032] Figure 1 This is a front sectional view of a photovoltaic cell module according to an embodiment of the present utility model;

[0033] Figure 2 for Figure 1 Sectional view along line AA;

[0034] Figure 3 This is one of the exploded view diagrams of a photovoltaic cell module according to an embodiment of the present utility model;

[0035] Figure 4 for Figure 1 Sectional view along the BB line;

[0036] Figure 5 This is a second exploded view of a photovoltaic cell module according to an embodiment of the present invention.

[0037] Explanation of reference numerals in the attached figures:

[0038] 1. First backplane; 11. Packaging area; 12. Lead-out area; 13. Lead-out hole;

[0039] 2. Second backplate; 22. Annular groove; 3. Battery cell; 4. Conductive component;

[0040] 5. First packaging structure; 51. First annular protrusion; 511. First gap; 52. Second annular protrusion; 6. Second packaging structure; 61. Third annular protrusion; 611. Second gap; 62. First elongated protrusion; 7. Third packaging structure; 71. Second elongated protrusion. Detailed Implementation

[0041] 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 protection scope of this utility model.

[0042] In the description of the embodiments of this utility model, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this utility model. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0043] In the description of the embodiments of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this utility model based on the specific circumstances.

[0044] In this embodiment of the utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below the second feature. Referring to the accompanying drawings, this utility model provides a photovoltaic cell module. This cell can be a perovskite solar cell or similar cell; for ease of description, the following description will use a perovskite solar cell as an example, without loss of generality.

[0045] like Figures 1 to 5 As shown, the photovoltaic cell module according to the first aspect of the present invention includes a first backsheet 1, a second backsheet 2, and a cell 3.

[0046] The first backplate 1, the battery cell 3, and the second backplate 2 are stacked sequentially, with the first backplate 1 and the second backplate 2 spaced apart to form a gap.

[0047] The space includes a packaging area 11 and a lead-out area 12. The battery cell 3 is installed in the packaging area 11. A through lead-out hole 13 is provided on the first back plate 1 corresponding to the lead-out area 12. The conductive component 4 connected to the battery cell 3 is led out to the outside of the space through the lead-out area 12 and the lead-out hole 13 in sequence.

[0048] A first encapsulation structure 5 is arranged around the outer periphery of the space, and an adhesive is disposed inside the first encapsulation structure 5. A second encapsulation structure 6 is arranged around the outer periphery of the encapsulation area 11, and a desiccant is disposed inside the second encapsulation structure 6. The first encapsulation structure 5 is located outside the second encapsulation structure 6.

[0049] The photovoltaic cell module according to an embodiment of the present invention has the following specific structure:

[0050] The first backplate 1 and the second backplate 2 form the basic framework of the battery assembly, providing physical support and protection. The battery cell 3 is the core part of the battery, responsible for storing energy and providing power. The space is formed by the gap between the first backplate 1 and the second backplate 2, and this space is divided into an encapsulation area 11 and a lead-out area 12.

[0051] The encapsulation area 11 is used to install the battery cell 3; and for the lead-out area 12, a through hole is provided in the part of the first back plate 1 corresponding to the lead-out area 12 for external connection of the conductive component 4 (such as an electrode).

[0052] The first encapsulation structure 5 surrounds the outer periphery of the encapsulation area 11 and contains a desiccant to absorb any moisture that may be present, keeping the internal environment dry and thus preventing the cell 3 from being damaged by moisture. The second encapsulation structure 6 is located outside the first encapsulation structure 5, surrounding the outer periphery of the entire space, and contains an adhesive to seal the entire component, enhancing its waterproof and dustproof properties.

[0053] Based on the above detailed structural description, it can be seen that the working principle of this battery module mainly focuses on two key design aspects: the partitioning of the encapsulation area 11 and the lead-out area 12, and the design of the first encapsulation structure 5 and the second encapsulation structure 6.

[0054] Firstly, the partitioning of the encapsulation area 11 and the lead-out area 12 serves the dual purpose of partitioning and physical isolation. Specifically, by dividing the component into the encapsulation area 11 (for housing the battery cell 3) and the lead-out area 12 (for external connection of the conductive component 4), the battery cell 3 can be effectively isolated from the external environment. This design allows the lead-out hole 13 to be independent of the battery cell 3, preventing external moisture from directly seeping into the battery cell 3 through the lead-out hole 13.

[0055] Meanwhile, since the first encapsulation structure 5 is arranged around the encapsulation area 11, a physical barrier is further formed between the encapsulation area 11 and the lead-out area 12. Even if a small amount of water vapor enters the lead-out area 12 through the lead-out hole 13, it is difficult to penetrate into the encapsulation area 11, thereby protecting the battery cell 3 from the influence of moisture.

[0056] Secondly, the first encapsulation structure 5 surrounds the outer periphery of the encapsulation area 11 and contains a desiccant. Its main function is to absorb any trace moisture that may penetrate into the encapsulation area 11, keeping the interior dry and preventing damage or performance degradation of the battery cell 3 due to moisture. The second encapsulation structure 6 is located outside the first encapsulation structure 5, surrounding the entire space, and is sealed with adhesive. This structure provides stronger protection, such as waterproofing and dustproofing, preventing harmful substances such as moisture and dust from the external environment from entering the component through any possible means (including but not limited to the lead-out hole 13).

[0057] In summary, these two designs complement each other. The presence of the first encapsulation structure 5 not only ensures the dryness of the environment inside the encapsulation area 11, but also provides additional protection for the physical separation between the encapsulation area 11 and the lead-out area 12. The second encapsulation structure 6 provides comprehensive protection for the entire component from a more macroscopic perspective, ensuring that both the core area where the cell 3 is located and the external connection parts are protected from adverse external factors.

[0058] In related technologies, perovskite solar cells have achieved efficiencies comparable to crystalline silicon modules after more than a decade of development. Current encapsulation technologies include: sealing the module edges with a sealing material (such as butyl rubber); leading conductive components directly from the cell to the outside through simple perforations; and using a single type of encapsulation material (such as POE film) inside the module for bonding and protection between the cell and the backsheet. Specifically, high-temperature lamination technology is used to tightly bond the various layers of materials (including the cell and encapsulation material). This process typically requires heating to melt certain encapsulation materials (such as POE film) to achieve bonding.

[0059] However, in traditional packaging structures, while high-temperature lamination can effectively bond the various layers of materials tightly, high temperatures can lead to compositional imbalances in some temperature-sensitive materials (such as perovskites), thus affecting battery stability and efficiency. Furthermore, because conductive components in existing structures are directly led out through simple perforations, external moisture can easily seep into the cell through these holes, impacting battery performance and lifespan.

[0060] Therefore, in order to overcome the technical defects existing in the above-mentioned related technologies, this utility model changes the battery packaging structure and uses the first packaging structure 5 and the second packaging structure 6 to achieve a better sealing and waterproof effect.

[0061] Furthermore, by dividing the space into an encapsulation area 11 (for mounting the battery cell 3) and a lead-out area 12, and by providing a through lead-out hole 13 in the portion of the first back plate 1 corresponding to the lead-out area 12, the present invention reduces the risk of external moisture seeping into the battery cell 3 through the lead-out hole 13.

[0062] Furthermore, the components of this utility model have at least the following advantages compared to related technologies:

[0063] (1) Improve battery stability: The battery module is sealed as a whole by the first encapsulation structure 5, and the outer periphery of the cell 3 is encapsulated by the second encapsulation structure 6. This avoids the impact of water vapor entering the cell 3 through the lead hole 13 or the failure of the first encapsulation structure 5, increases the resistance to water and oxygen intrusion, and improves the stability of the battery module.

[0064] (2) Enhanced waterproof and moisture-proof performance: Utilizing a double-layer encapsulation structure—the inner second encapsulation structure 6 containing desiccant absorbs moisture, while the outer first encapsulation structure 5 filled with adhesive provides a physical barrier—effectively extends the path of moisture intrusion and enhances the ability to block moisture. Compared to the traditional single POE film encapsulation method, this design provides a higher level of waterproof and moisture-proof protection.

[0065] (3) Extended service life: By reducing the impact of external moisture on the battery cell 3, this invention helps to extend the actual service life of the battery, reduce maintenance costs, and improve user satisfaction. Figure 1 , Figure 4 and Figure 5 As shown, according to some embodiments of the present invention, a third encapsulation structure 7 is provided between the encapsulation area 11 and the lead-out area 12. An adhesive is provided inside the third encapsulation structure 7, and the third encapsulation structure 7 is located outside the first encapsulation structure 5 and inside the second encapsulation structure 6.

[0066] In this embodiment, a third encapsulation structure 7 is added between the encapsulation region 11 and the lead-out region 12. This structure is located inside the first encapsulation structure 5 (the outermost layer) and outside the second encapsulation structure 6 (the structure containing desiccant surrounding the cell 3). That is, the third encapsulation structure 7 is deliberately positioned closer to the core of the battery, somewhere between external protection and internal desiccant protection.

[0067] The third encapsulation structure 7 is filled with adhesive, the main purpose of which is to enhance the sealing performance between the encapsulation area 11 and the lead-out area 12, provide an additional physical barrier, and prevent moisture from seeping into the encapsulation area 11 where the cell 3 is located through any tiny gaps between the two areas.

[0068] Thus, the introduction of the third encapsulation structure 7 further refines the zoning protection strategy of the battery assembly. It not only strengthens the barrier against moisture intrusion but also isolates the encapsulation area 11 from the lead-out area 12, ensuring that even if moisture enters the lead-out area 12, it is difficult for it to penetrate into the encapsulation area 11 and affect the safe and stable operation of the cell 3. This design adds another layer of safety to the entire encapsulation system, improving its overall waterproof and moisture-proof capabilities, making it particularly suitable for battery types requiring high levels of protection.

[0069] like Figure 1 , Figure 2 and Figure 3 As shown, according to some embodiments of the present invention, a first annular protrusion 51 is provided on the surface of the first back plate 1 facing the second back plate 2; the first annular protrusion 51 is arranged around the outer periphery of the first back plate 1, and the inner side of the first annular protrusion 51 defines the first packaging structure 5.

[0070] Furthermore, a first annular protrusion 51 and a second annular protrusion 52 are provided on the side surface of the first back plate 1 facing the second back plate 2.

[0071] The first annular protrusion 51 and the second annular protrusion 52 are both arranged around the outer periphery of the first back plate 1. The first annular protrusion 51 is located outside the second annular protrusion 52. The first annular protrusion 51 and the second annular protrusion 52 define a groove-shaped first encapsulation structure 5. The second annular protrusion 52 surrounds the outside of the space.

[0072] In this embodiment, two annular protrusions, namely a first annular protrusion 51 and a second annular protrusion 52, are provided on the lower surface of the first back plate 1. Both annular protrusions are arranged around the outer periphery of the first back plate 1, forming a closed annular structure.

[0073] In this structure, the first annular protrusion 51 surrounds the second annular protrusion 52, forming a groove-like space between them. This groove-like space is defined as the first encapsulation structure 5. The groove is filled with adhesive, providing a physical barrier to prevent harmful substances such as moisture and dust from entering the battery. Simultaneously, the second annular protrusion 52 surrounds the outer side of the space, that is, it is located on the periphery of the area where the battery cell 3 is located, further protecting the battery cell 3 from the influence of the external environment.

[0074] In this way, on the one hand, by setting a double-layer annular protrusion on the first backplate 1 and using the groove between them as the first encapsulation structure 5, the sealing performance of the entire component can be effectively improved. This structure can prevent moisture and other contaminants from entering the battery from the side.

[0075] On the other hand, the first annular protrusion 51 and the second annular protrusion 52 work together to provide multi-layered physical protection. In particular, the second annular protrusion 52 directly surrounds the outer side of the space (including the battery cell 3), ensuring that the battery cell 3 receives the most direct protection.

[0076] As shown above, the design cleverly utilizes the surface space of the first backplate 1 and achieves complex protective functions through simple geometric changes without adding extra materials or complex processes.

[0077] like Figure 1 , Figure 2 and Figure 3 As shown, according to some embodiments of the present invention, on the projection plane perpendicular to the second back plate 2, the top of the first annular protrusion 51 rests on the outer peripheral wall of the second back plate 2.

[0078] A first gap 511 is formed between the inner peripheral wall of the first annular protrusion 51 and the outer peripheral wall of the second back plate 2. The first gap 511 is connected to the first encapsulation structure 5 and is filled with adhesive.

[0079] It can be understood that, in the vertical direction, the top of the first annular protrusion 51 is located between the upper and lower surfaces of the second back plate 2, that is, the top of the first annular protrusion 51 is lower than the upper surface of the second back plate 2 and higher than the lower surface of the second back plate 2. At the same time, a first gap 511 is formed between the inner peripheral wall of the first annular protrusion 51 and the outer peripheral wall of the second back plate 2. The first gap 511 is connected to the first packaging structure 5 and together they form an "L"-shaped groove structure. The "L"-shaped groove structure is filled with adhesive.

[0080] It should be noted that the "L"-shaped groove structure increases the path length that any moisture attempting to enter the package must take. Because moisture needs to penetrate along this longer and more complex path, its intrusion becomes significantly more difficult. In this way, by extending the moisture intrusion path, the impact of external moisture on cell 3 is reduced, maintaining a dry internal environment for the battery and contributing to the long-term stability of battery performance.

[0081] In summary, by using a first annular protrusion 51 at the edge of the first back plate 1 to form an "L"-shaped groove structure with the second back plate 2 and filling it with adhesive, this utility model not only enhances the overall sealing and waterproof and moisture-proof performance of the component, but also significantly improves the stability and durability of the component by extending the moisture intrusion path.

[0082] like Figure 1 , Figure 2 and Figure 3 As shown, further, an annular groove 22 is provided on the side surface of the second back plate 2 facing the first back plate 1. The annular groove 22 is arranged around the outer periphery of the second back plate 2 and corresponds to the position of the second annular protrusion 52. The second annular protrusion 52 is fitted in the annular groove 22.

[0083] In this embodiment, a downwardly recessed annular groove 22 is provided on the upper surface of the second back plate 2. The annular groove 22 is arranged around the outer periphery of the second back plate 2, and its position corresponds to the second annular protrusion 52 on the first back plate 1. The second annular protrusion 52 extends from the first back plate 1 and fits precisely into the annular groove 22 on the second back plate 2.

[0084] In this way, by embedding the second annular protrusion 52 into the annular groove 22 of the second backplate 2, a stable fit between the two backplates can be achieved, effectively preventing harmful substances such as external moisture and dust from entering the battery through any possible tiny gaps. In addition, the annular groove 22 can also serve as a positioning aid for installation, while helping to evenly distribute the stress inside the component, reducing the risk of damage caused by local stress concentration, thereby extending its service life.

[0085] like Figure 1 , Figure 4 and Figure 5 As shown, according to some embodiments of the present invention, a third annular protrusion 61 is further provided on the surface of the first back plate 1 facing the second back plate 2; the third annular protrusion 61 is located inside the first annular protrusion 51, the outer side of the third annular protrusion 61 defines the second encapsulation structure 6, and the third annular protrusion 61 surrounds the outer side of the encapsulation area 11.

[0086] Furthermore, a third annular protrusion 61 and a first elongated protrusion 62 are provided on the surface of the first back plate 1 facing the second back plate 2.

[0087] The second annular protrusion 52 and the first elongated protrusion 62 are both located outside the third annular protrusion 61, and the two ends of the first elongated protrusion 62 are respectively connected to the inner walls of the opposite sides of the second annular protrusion 52. The first elongated protrusion 62 and the second annular protrusion 52 define the second encapsulation structure 6 between the first elongated protrusion 62 and the third annular protrusion 61, and the third annular protrusion 61 surrounds the outer side of the encapsulation area 11.

[0088] In this embodiment, a third annular protrusion 61 is provided on the lower surface of the first backplate 1. The third annular protrusion 61 directly surrounds the encapsulation area 11 where the battery cell 3 is located, providing the most direct protection for the battery cell 3. A first elongated protrusion 62 is provided on the lower surface of the first backplate 1, with its two ends respectively connected to the inner walls of the opposite sides of the second annular protrusion 52. This design creates a closed space between the first elongated protrusion 62 and the second annular protrusion 52, which, together with the third annular protrusion 61, defines the second encapsulation structure 6.

[0089] Specifically, the inner wall of the first elongated protrusion 62 and part of the inner peripheral wall of the second annular protrusion 52 enclose a closed space. The third annular protrusion 61 is located within this closed space. At the same time, the third annular protrusion 61 divides the closed space into an annular groove-shaped structure on the outside and a small closed space on the inside. The annular groove-shaped structure on the outside is the second encapsulation structure 6, which is filled with desiccant. The small closed space on the inside is the encapsulation area 11, which houses the battery cell 3.

[0090] It can be understood that the second encapsulation structure 6 is defined by the outer peripheral wall of the third annular protrusion 61, the inner sidewall of the first elongated protrusion 62, and a portion of the inner peripheral wall of the second annular protrusion 52.

[0091] It should be noted that the first elongated protrusion 62 connects the opposite sides of the second annular protrusion 52, increasing the rigidity and stability of the structure. Even under external pressure or vibration, it maintains good integrity, reducing the risk of damage caused by localized stress concentration.

[0092] Thus, by adding a third annular protrusion 61 and a first elongated protrusion 62 to the first backplate 1, and combining them with the second annular protrusion 52 to define the second encapsulation structure 6, this utility model further improves the sealing and protection performance of the battery assembly.

[0093] like Figure 1 , Figure 4 and Figure 5 As shown, at least a portion of the top of the third annular protrusion 61 is spaced apart from the second back plate 2 to define a second gap 611.

[0094] In this way, on the one hand, the second gap 611 can prevent the third annular protrusion 61 from touching the second back plate 2. On the other hand, since there is also an encapsulation film between the cell 3 and the second back plate 2, and the encapsulation film completely covers the cell 3, the second gap is used to leave height for the edge of the film, and is also a channel for the encapsulation film to overflow outward during high-temperature lamination.

[0095] For example, the width of the second gap 611 ranges from 0.5 mm to 2 mm.

[0096] like Figure 1 , Figure 4 and Figure 5 As shown, in some specific embodiments of this utility model, a second elongated protrusion 71 is also provided on the side surface of the first back plate 1 facing the second back plate 2. The two ends of the second elongated protrusion 71 are respectively connected to the inner walls of the opposite sides of the second annular protrusion 52. The second elongated protrusion 71 is located outside the first elongated protrusion 62 and defines a third encapsulation structure 7 between the second elongated protrusion 62 and the first elongated protrusion 62.

[0097] In this embodiment, the third encapsulation structure 7 is defined between the second elongated protrusion 71 and the first elongated protrusion 62. Its specific structural form is a long strip-shaped groove structure. The groove structure is filled with adhesive to further separate the lead-out area 12 and the encapsulation area 11, thereby further ensuring the sealing of the encapsulation area 11.

[0098] It should be noted that the second elongated protrusion 71 connects the opposite sides of the second annular protrusion 52, increasing the rigidity and stability of the structure. Even under external pressure or vibration, it maintains good integrity, reducing the risk of damage caused by localized stress concentration.

[0099] In this way, by adding a second elongated protrusion 71 to the first backplate 1 and combining it with the first elongated protrusion 62 to define the third encapsulation structure 7, the present invention further achieves effective isolation between the lead-out area 12 and the encapsulation area 11, improves the sealing performance of the encapsulation area 11, and thus enhances the protection of the battery cell 3.

[0100] like Figure 4 and Figure 5 As shown, according to some embodiments of the present invention, the first elongated protrusion 62 and the second elongated protrusion 71 have equal heights and are spaced apart or in contact with the conductive element 4 and the second back plate 2.

[0101] In this embodiment, the conductive element 4 can be a conductive tape. The conductive tape is attached to the bottom surface of the cell 3 and extends from the encapsulation area 11 to the lead-out area 12. Specifically, the conductive tape passes through the third annular protrusion 61, the second encapsulation structure 6, the first elongated protrusion 62, the third encapsulation structure 7, and the second elongated protrusion 71 in sequence and enters the lead-out area 12, and is further led out to the outside of the battery through the lead-out hole 13.

[0102] It should be explained that the conductive tape is extremely thin, and due to the adhesive inside the third encapsulation structure 7, the passage of the conductive tape will not affect the original sealing effect of the component.

[0103] Thus, this invention provides an efficient and reliable electrical connection solution. The extremely thin conductive tape and the adhesive within the third encapsulation structure 7 ensure that even if the conductive tape passes through, the original sealing effect of the component will not be affected.

[0104] like Figure 4 and Figure 5 As shown, furthermore, the second back plate 2 has two elongated grooves on the side facing the first back plate 1. The two elongated grooves correspond to the positions of the first elongated protrusion 62 and the second elongated protrusion 71, respectively, and the first elongated protrusion 62 and the second elongated protrusion 71 are respectively fitted into the two elongated grooves. In this way, the elongated grooves can simultaneously achieve the functions of positioning assistance and enhancing sealing.

[0105] In one optional embodiment, a gap is provided between the battery cell 3 and the first backplate 1; or, at least an encapsulation layer is provided between the battery cell 3 and the first backplate 1, the encapsulation layer being an encapsulation film or a cured liquid adhesive layer.

[0106] In this embodiment, in one case, the structure without an encapsulating film can achieve low-temperature encapsulation; in another case, the structure with an encapsulating film, although requiring heat lamination, can increase water resistance, and when the encapsulating film is a cured liquid adhesive layer, it can also achieve the effect of low-temperature encapsulation.

[0107] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A photovoltaic cell module, characterized in that, It includes a first backplate (1), a second backplate (2), and a battery cell (3); The first backplate (1), the battery cell (3) and the second backplate (2) are stacked in sequence, with the first backplate (1) and the second backplate (2) spaced apart to form a gap space; The space includes a packaging area (11) and a lead-out area (12). The battery cell (3) is installed in the packaging area (11). The first back plate (1) is provided with a through lead-out hole (13) corresponding to the lead-out area (12). The conductive component (4) connected to the battery cell (3) is led out to the outside of the space through the lead-out area (12) and the lead-out hole (13) in sequence. A first encapsulation structure (5) is provided around the outer periphery of the space, and an adhesive is provided inside the first encapsulation structure (5). A second encapsulation structure (6) is provided around the outer periphery of the encapsulation area (11), and a desiccant is provided inside the second encapsulation structure (6). The first encapsulation structure (5) is located outside the second encapsulation structure (6).

2. The photovoltaic cell module according to claim 1, characterized in that, A third encapsulation structure (7) is provided between the encapsulation area (11) and the lead-out area (12). An adhesive is provided inside the third encapsulation structure (7), and the third encapsulation structure (7) is located outside the first encapsulation structure (5) and inside the second encapsulation structure (6).

3. The photovoltaic cell module according to claim 2, characterized in that, The first back plate (1) has a first annular protrusion (51) on the side surface facing the second back plate (2); The first annular protrusion (51) is arranged around the outer periphery of the first back plate (1), and the inner side of the first annular protrusion (51) defines the first encapsulation structure (5).

4. The photovoltaic cell module according to claim 3, characterized in that, On the projection plane perpendicular to the second back plate (2), the top of the first annular protrusion (51) falls on the outer peripheral wall of the second back plate (2); A first gap (511) is formed between the inner peripheral wall of the first annular protrusion (51) and the outer peripheral wall of the second back plate (2). The first gap (511) is connected to the first encapsulation structure (5) and is filled with adhesive.

5. The photovoltaic cell module according to claim 3, characterized in that, A second annular protrusion (52) is also provided on the side surface of the first back plate (1) facing the second back plate (2); The second annular protrusion (52) is arranged around the outer periphery of the first back plate (1), the first annular protrusion (51) is located outside the second annular protrusion (52), the first encapsulation structure (5) is defined between the inner side of the first annular protrusion (51) and the outer side of the second annular protrusion (52), and the second annular protrusion (52) surrounds the outer side of the space.

6. The photovoltaic cell module according to claim 5, characterized in that, The second back plate (2) has an annular groove (22) on one side surface facing the first back plate (1). The annular groove (22) is arranged around the outer periphery of the second back plate (2) and corresponds to the position of the second annular protrusion (52). The second annular protrusion (52) fits in the annular groove (22).

7. The photovoltaic cell module according to any one of claims 3 to 6, characterized in that, A third annular protrusion (61) is also provided on the side surface of the first back plate (1) facing the second back plate (2); The third annular protrusion (61) is located inside the first annular protrusion (51), and the outer side of the third annular protrusion (61) defines the second packaging structure (6). The third annular protrusion (61) surrounds the outer side of the packaging area (11).

8. The photovoltaic cell module according to claim 7, characterized in that, At least a portion of the top of the third annular protrusion (61) is spaced apart from the second back plate (2) to define a second gap (611).

9. The photovoltaic cell module according to claim 7, characterized in that, The first backplate (1) has a first elongated protrusion (62) on the side surface facing the second backplate (2). The first elongated protrusion (62) is located outside the third annular protrusion (61) and inside the first annular protrusion (51). The outer side of the first elongated protrusion (62) defines the third packaging structure (7).

10. The photovoltaic cell module according to any one of claims 1 to 6, characterized in that, A gap is provided between the battery cell (3) and the first backplate (1); Alternatively, at least one encapsulation layer is provided between the battery cell (3) and the first backplate (1), the encapsulation layer being an encapsulation film or a cured liquid adhesive layer.

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