Battery piece assembly and curved surface heat dissipation tile packaging structure

Abstract

The utility model provides a battery piece assembly and a curved surface heat dissipation tile packaging structure. The battery piece assembly comprises a battery piece layer, a first packaging layer, a second packaging layer and an insulation heat dissipation layer. The battery piece layer is provided with a first surface and a second surface which are opposite to each other. The first packaging layer is arranged on the first surface. The second packaging layer is arranged on the second surface, and the battery piece layer is packaged by the second packaging layer and the first packaging layer together. The insulating heat dissipation layer is arranged on the surface, away from the battery piece layer, of the second packaging layer. The heat dissipated by the battery piece can be transmitted to the insulating heat dissipation layer through the second packaging layer, and the insulating heat dissipation layer absorbs the heat dissipated by the battery piece to dissipate heat of the battery piece, so that the temperature of the battery piece during working can be reduced, the working efficiency of the battery piece is improved, and meanwhile, the aging of the battery piece is slowed down.

Description

Technical Field

[0001] The present application relates to the field of photovoltaic technology, and in particular to a battery cell assembly and a curved heat dissipation tile packaging structure. Background Art

[0002] With the promotion of clean energy - solar energy, more and more life scenes have been added with solar power generation functions. In the actual use of photovoltaic modules in outdoor power generation and receiving solar radiation, it is inevitable to generate a certain amount of heat. According to tests, when the solar radiation is strong at noon, the surface temperature of photovoltaic modules can reach nearly 70℃, and the temperature of photovoltaic modules installed on the roof can even reach nearly 80℃.

[0003] The impact of temperature on photovoltaic modules is mainly reflected in the open circuit voltage. That is, when the temperature rises, the open circuit voltage of the cells in the photovoltaic module decreases, which in turn causes a decrease in the power generation capacity of the photovoltaic module, and the impact on the power generation performance of the photovoltaic module is very obvious.

[0004] At the same time, the aging rate of various components of photovoltaic modules will be significantly accelerated under high temperatures, and the life of photovoltaic modules will be significantly shortened, resulting in a decrease in the reliability performance of photovoltaic modules. Utility Model Content

[0005] The embodiments of the present application propose a battery cell assembly and a curved heat sink packaging structure to at least partially improve the above-mentioned problems.

[0006] The implementation method of the present application is achieved through the following technical solutions.

[0007] In a first aspect, an embodiment of the present application provides a battery cell assembly, including: a battery cell layer, a first encapsulation layer, a second encapsulation layer, and an insulating heat dissipation layer. The battery cell layer has a first surface and a second surface opposite to each other, and the first encapsulation layer is disposed on the first surface. The second encapsulation layer is disposed on the second surface and encapsulates the battery cell layer together with the first encapsulation layer. The insulating heat dissipation layer is disposed on a surface of the second encapsulation layer away from the battery cell layer.

[0008] In some embodiments, the thickness of the first packaging layer is 200 μm-400 μm, the thickness of the second packaging layer is 200 μm-400 μm, and the thickness of the insulating heat dissipation layer is 80 μm-330 μm.

[0009] In some embodiments, the insulating heat dissipation layer includes: a substrate layer, a graphene layer, and an adhesive layer. The substrate layer is an insulating layer, and the graphene layer is disposed on the substrate layer. The adhesive layer is disposed between the substrate layer and the graphene layer, and adheres the graphene layer and the substrate layer. The substrate layer is bonded to the second encapsulation layer.

[0010] In some embodiments, the substrate layer has a thickness of 20 μm-100 μm.

[0011] In some embodiments, the graphene layer has a thickness of 50 μm-200 μm.

[0012] In some embodiments, the thickness of the adhesive layer is 10 μm-30 μm.

[0013] In a second aspect, the embodiment of the present application also provides a curved heat dissipation tile packaging structure, comprising a cell assembly, a front plate, a back plate and an adhesive film as described above. The front plate is arranged on a side of the first packaging layer away from the cell, and is connected to the first packaging layer. The back plate is arranged on a side of the insulating heat dissipation layer away from the cell, and is connected to the insulating heat dissipation layer. The adhesive film is arranged between the cell assembly and the front plate, and between the cell and the back plate, and bonds the cell assembly and the front plate, and the cell assembly and the back plate.

[0014] In some embodiments, the front plate is configured as a curved surface structure.

[0015] In some embodiments, the back plate and the battery cell assembly are both configured as arc-shaped curved structures.

[0016] In some embodiments, the radius of curvature of the front plate, the back plate, and the battery cell assembly is 50 mm-200 mm.

[0017] The embodiments of the present application provide a battery cell assembly and a curved heat dissipation tile packaging structure, wherein the battery cell assembly is between a first packaging layer and a second packaging layer, and an insulating heat dissipation layer is arranged on the surface of the second packaging layer away from the battery cell. The heat dissipated by the battery cell can be transferred to the insulating heat dissipation layer through the second packaging layer, and the insulating heat dissipation layer absorbs the heat dissipated by the battery cell and dissipates it outward to dissipate the heat of the battery cell. This can reduce the temperature of the battery cell during operation, improve the working efficiency of the battery cell, and slow down the aging of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the implementation mode of the present application, the drawings required for use in the description of the implementation mode will be briefly introduced below. Obviously, the drawings described below are only some implementation modes of the present utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 An exploded view of a curved heat dissipation tile packaging structure provided by an embodiment of the present application is shown;

[0020] Figure 2An exploded view of another curved heat dissipation tile packaging structure provided by an embodiment of the present application is shown;

[0021] Figure 3 A schematic structural diagram of an insulating heat dissipation layer provided in one embodiment of the present application is shown.

[0022] Figure numerals: curved heat dissipation tile packaging structure 1, battery cell assembly 10, battery cell layer 110, first surface 111, second surface 112, first packaging layer 120, second packaging layer 130, insulating heat dissipation layer 140, substrate layer 141, graphene layer 142, adhesive layer 143, front plate 20, back plate 30, adhesive film 40. DETAILED DESCRIPTION

[0023] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the implementation mode of the present application will be clearly and completely described below in conjunction with the drawings in the implementation mode of the present application. Obviously, the described implementation mode is only a part of the implementation mode of the utility model, not all the implementation modes. Based on the implementation mode in the utility model, all other implementation modes obtained by those skilled in the art without making creative work are within the scope of protection of the utility model.

[0024] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present application.

[0025] With the promotion of clean energy - solar energy, more and more life scenes have been added with solar power generation functions. In the actual use of photovoltaic modules in outdoor power generation and receiving solar radiation, it is inevitable to generate a certain amount of heat. According to tests, when the solar radiation is strong at noon, the surface temperature of photovoltaic modules can reach nearly 70℃, and the temperature of photovoltaic modules installed on the roof can even reach nearly 80℃.

[0026] The impact of temperature on photovoltaic modules is mainly reflected in the open circuit voltage. That is, when the temperature rises, the open circuit voltage of the cells in the photovoltaic module decreases, which in turn causes a decrease in the power generation capacity of the photovoltaic module, and the impact on the power generation performance of the photovoltaic module is very obvious.

[0027] At the same time, the aging rate of various components of photovoltaic modules will be significantly accelerated under high temperatures, and the life of photovoltaic modules will be significantly shortened, resulting in a decrease in the reliability performance of photovoltaic modules.

[0028] Based on the above questions, please refer to Figure 1The embodiment of the present application provides a curved heat dissipation tile packaging structure 1, which can be applied to photovoltaic modules. The curved heat dissipation tile packaging structure 1 may include: a cell assembly 10, a front plate 20, a back plate 30, and an adhesive film 40. The cell assembly 10 may be used to receive sunlight and convert solar energy into electrical energy for storage. The front plate 20 and the back plate 30 may be used to protect the cell assembly 10. The cell assembly 10 may be disposed between the front plate 20 and the back plate 30. The cell assembly 10 and the front plate 20 may be connected by an adhesive film 40, and the cell assembly 10 and the back plate may also be connected by an adhesive film 40.

[0029] Please refer to Figure 2 In one embodiment, the battery cell assembly 10 may include: a battery cell layer 110 , a first packaging layer 120 , a second packaging layer 130 and an insulating heat dissipation layer 140 .

[0030] Specifically, the cell layer 110 can be used to absorb sunlight and convert solar energy into electrical energy for storage. The cell layer 110 can have a first surface 111 and a second surface 112 opposite to each other. The cell layer 110 can be selected from one of a Passivated Emitter and Rear Cell (PERC) cell or an Interdigitated Back Contact (IBC) cell. The above cells utilize solar cell technology and can improve the energy conversion efficiency of the cell layer 110. The specific cell to be used can be selected according to actual conditions, and this application does not limit it here.

[0031] In addition, in this embodiment, the battery cell layer 110 can be composed of multiple battery cells, and the multiple battery cells can be connected in series through wires, which can increase the overall voltage and provide greater output power to the outside. It can be understood that the multiple battery cells can also be connected in parallel through wires to increase the overall capacity. The specific method of connecting the multiple battery cells can be set according to actual conditions and is not limited here.

[0032] The first encapsulation layer 120 may be disposed on the first surface 111 , the second encapsulation layer 130 may be disposed on the second surface 112 , and the first encapsulation layer 120 and the second encapsulation layer 130 may jointly encapsulate the battery cell layer 110 .

[0033] In order to simplify the production process and assembly difficulty, the first encapsulation layer 120 and the second encapsulation layer 130 can be made of the same material, for example, ethylene-vinyl acetate (EVA) copolymer, EVA is a thermoplastic plastic, the material has sufficient strength, and can be used to protect the battery layer 110 disposed between the first encapsulation layer 120 and the second encapsulation layer 130. At the same time, EVA has a low thermal conductivity, which can reduce the heat transfer speed, thereby reducing the impact of external heat on the battery layer 110. Specifically, when the battery cell assembly 10 receives sunlight, the first encapsulation layer 120 and the second encapsulation layer 130 can reduce the impact of the heat generated by the sunlight on the battery layer 110, thereby ensuring the stability and reliability of the battery layer 110.

[0034] Furthermore, the thickness of the first encapsulation layer 120 and the second encapsulation layer 130 can be set to 200μm-400μm, so that while reducing the volume of the battery cell assembly 10, sufficient strength can be provided to protect the battery cell layer 110, so as to avoid the battery cell layer 110 being too large and affecting the carrying and installation of the battery cell assembly 10. It can be understood that if the thickness of the first encapsulation layer 120 is too small, the strength of the first encapsulation layer 120 will be insufficient, and it will be difficult to play a role in protecting the battery cell. The embodiment of the present application does not limit the specific size of the first encapsulation layer 120 and the second encapsulation layer 130. For example, it can be 200μm, 300μm or 400μm, etc., which is not limited here and can be set according to actual conditions.

[0035] The insulating heat dissipation layer 140 can be arranged on the surface of the second packaging layer 130 away from the battery cell layer 110. The insulating heat dissipation layer 140 can be used to dissipate heat from the battery cell layer 110 and can play an insulating role to prevent the battery cell layer 110 from accidentally contacting the outside world and causing a short circuit.

[0036] Furthermore, the thickness of the insulating heat dissipation layer 140 can be set to 80μm-330μm, so that it can provide a good insulation effect while reducing the volume of the battery cell assembly 10, avoiding the battery cell assembly 10 from being too large and affecting the carrying and installation of the battery cell assembly 10. It can be understood that if the thickness of the insulating heat dissipation layer 140 is too small, the insulating effect of the insulating heat dissipation layer 140 will be insufficient, making it difficult to play an insulating role.

[0037] In one embodiment, the insulating heat dissipation layer 140 can be made of a composite material of graphene and other materials. Figure 3 The insulating heat dissipation layer 140 may include: a substrate layer 141 , a graphene layer 142 and an adhesive layer 143 .

[0038] The substrate layer 141 can be made of an insulating material, that is, in this embodiment, the substrate layer 141 is an insulating layer. Furthermore, the substrate layer 141 can be made of polyethylene terephthalate (PET), which is a thermoplastic plastic. This material as the substrate layer 141 can provide a certain structural strength.

[0039] Furthermore, since the first encapsulation layer 120 and the second encapsulation layer 130 have insulating properties under low pressure, but do not have insulating properties under high pressure, in this embodiment, the substrate layer 141 can be attached to the second encapsulation layer 130, which can further play an insulating effect and prevent leakage of the battery cell assembly 10. Specifically, the thickness of the substrate layer 141 can be 20μm-100μm, so that the insulating heat dissipation layer 140 has a certain thickness, which can facilitate the assembly of the battery cell assembly 10.

[0040] The graphene layer 142 is disposed on the substrate layer 141. Specifically, since the graphene layer 142 has a conductive property, in this embodiment, the graphene layer 142 is located on a side away from the second encapsulation layer 130, so that the graphene layer 142 can be prevented from contacting the second encapsulation layer 130, thereby preventing the battery cell assembly 10 from leaking electricity under high voltage. Furthermore, the thickness of the graphene layer 142 can be 50 μm-200 μm, so that a good insulation effect can be provided while reducing the volume of the insulating heat dissipation layer 140. For example, it can be 50 μm, 100 μm or 200 μm, etc., which can be set according to actual conditions and is not limited here.

[0041] It should be noted that, in this embodiment, the high horizontal thermal conductivity of graphene material can be used to facilitate rapid heat conduction in the horizontal direction, so that the heat distribution of the entire battery cell assembly 10 is uniform, local overheating is eliminated, and thus the occurrence of hot spot effect is prevented. At the same time, the high thermal radiation coefficient of graphene material can be used to dissipate heat to avoid excessively high operating temperature and serious heat accumulation of the curved heat dissipation tile packaging structure 1, thereby greatly improving the power generation efficiency of the curved heat dissipation tile packaging structure 1.

[0042] The adhesive layer 143 is disposed between the substrate layer 141 and the graphene layer 142, and bonds the graphene layer 142 and the substrate layer 141. In the present embodiment, the adhesive layer 143 may be a pressure-sensitive adhesive, which is a pressure-sensitive adhesive. When subjected to pressure, it will become sticky and adhere to the object. Specifically, an acrylic pressure-sensitive adhesive, a rubber pressure-sensitive adhesive, a silicone rubber pressure-sensitive adhesive or a polyurethane pressure-sensitive adhesive may be used. The specific thickness may be set according to the actual situation and is not limited here. Further, the thickness of the adhesive layer 143 may be 10 μm-30 μm. If the thickness of the adhesive layer 143 is too thick, it will lead to waste of resources, and will also lead to the thickness of the insulating heat dissipation layer 140 being too thick. If the thickness of the adhesive layer 143 is too thin, it will lead to poor bonding effect, and then cause the graphene layer 142 to separate from the substrate layer 141. For example, it may be 10 μm, 20 μm or 30 μm, etc. The specific thickness may be set according to the actual situation and is not limited here. In this embodiment, the graphene layer 142 in the insulating heat dissipation layer 140 covers a substrate layer 141, so that the insulating heat dissipation layer 140 has high temperature stability, high thermal conductivity, thermal insulation effect, oxygen barrier properties, high electrical insulation performance, and provides a safer and more reliable heat dissipation solution.

[0043] Please continue reading Figure 1 The front plate 20 can be arranged on the side of the first encapsulation layer 120 away from the battery cell and connected to the first encapsulation layer 120. The front plate 20 can be used to protect the battery cell assembly 10. In this embodiment, the front plate 20 can be made of curved tempered or semi-tempered glass. These materials have good heat resistance, good chemical corrosion resistance, good wear resistance and good electrical insulation performance.

[0044] The back plate 30 may be disposed on a side of the insulating heat dissipation layer 140 away from the battery cells and connected to the insulating heat dissipation layer 140. In this embodiment, the back plate 30 may be a rigid back plate 30 or a flexible back plate 30.

[0045] For details, please continue to refer to Figure 1 In this embodiment, the back plate 30 can be made of a rigid material, for example, a fiber-reinforced composite material, such as a composite material of carbon fiber, glass fiber, aramid fiber, nylon or polyurethane. These materials are wear-resistant, waterproof and highly weather-resistant. These materials are wear-resistant and waterproof, and have a certain support function and rigidity.

[0046] In another embodiment, the back plate 30 can be made of flexible materials, such as polyimide film (Chloropivalic chloride, CPC), PET substrate and other flexible materials. Such materials have good high temperature resistance, electrical insulation and water vapor barrier properties, and can meet the use requirements of the back plate 30 in harsh environments such as high temperature, high pressure, and high frequency. At the same time, the back plate 30 made of flexible materials can also have a certain degree of curvature, which is convenient for installation and maintenance.

[0047] The adhesive film 40 can be arranged between the battery cell assembly 10 and the front plate 20 and between the battery cell assembly 10 and the back plate 30, and bond the battery cell assembly 10 and the front plate 20 and the battery cell assembly 10 and the back plate 30. It should be noted that the adhesive film 40 is a hot melt adhesive, that is, at room temperature, the adhesive film 40 is solid and has no stickiness. When the adhesive film 40 is heated to a certain temperature, the adhesive film 40 will melt and bond to the object in contact with it. Specifically, the adhesive film 40 can be made of one of EVA, polyolefin elastomer (POE), EVAPOE / EVA co-extruded adhesive film or polyolefin elastomer (EPE) adhesive film 40 materials. These materials have a little elasticity and good adhesion, and can play a bonding role on the front plate 20, the back plate 30 and the adhesive film 40. Which specific adhesive film 40 to use can be selected according to actual conditions, and there is no restriction here.

[0048] Furthermore, in one embodiment, the front panel 20 can be configured as an arc-shaped curved surface structure. This can make the appearance of the entire curved heat dissipation tile packaging structure 1 more similar to the structure of a traditional tile, and can adapt to application scenarios such as traditional tile roofs. In addition, in other embodiments, the front panel 20 is set as an arc-shaped curved surface structure, and the curved heat dissipation tile packaging structure 1 can be directly set as a roof.

[0049] In addition, in other embodiments, the back panel 30 and the battery cell assembly 10 can also be set as an arc-shaped curved surface structure, so that the entire curved surface heat dissipation tile packaging structure 1 can be directly installed on a traditional tile roof. At this time, the arc-shaped curved surface structure can better fit the traditional tile roof, which is beneficial to improve the stability of the curved surface heat dissipation tile packaging structure 1 when installed on a traditional tile roof, and at the same time can increase the aesthetics.

[0050] Furthermore, when the front plate 20, the back plate 30 and the battery cell assembly 10 are set to a curved structure, the radius of curvature of the front plate 20, the back plate 30 and the battery cell assembly 10 is 50mm-200mm, so that the curved heat dissipation tile packaging structure 1 can have a curved surface while ensuring that the battery layer 110 in the battery cell assembly 10 is in a safe curvature range, thereby preventing the battery layer 110 from being broken due to excessive curvature. For example, the above-mentioned radius of curvature can be set to 50mm, 100mm or 200mm, etc., which is not limited here, and can be set specifically according to actual conditions. It should be noted that when the back plate 30 is made of flexible material, the radius of curvature of the back plate 30 is not limited.

[0051] The battery cell assembly 10 and the curved heat dissipation tile packaging structure 1 provided in the embodiment of the present application, wherein the battery cell assembly 10 is between the first packaging layer 120 and the second packaging layer 130, and an insulating heat dissipation layer 140 is provided on the surface of the second packaging layer 130 away from the battery cell, the heat emitted by the battery cell can be transferred to the insulating heat dissipation layer 140 through the second packaging layer 130, and the insulating heat dissipation layer 140 absorbs the heat dissipated by the battery cell to dissipate the heat of the battery cell, which can reduce the temperature of the battery cell during operation, improve the working efficiency of the battery cell, and slow down the aging of the battery cell. Specifically, the curved heat dissipation tile packaging structure 1 adds a layer of insulating heat dissipation layer 140 composed of graphene between the second packaging layer 120 of the battery cell assembly 10 and the back plate 30, and utilizes the characteristics of the high horizontal thermal conductivity of the graphene material to facilitate the rapid conduction of heat in the horizontal direction, so that the heat distribution of the entire battery cell assembly 10 is uniform, and local overheating is eliminated, thereby preventing the occurrence of the hot spot effect. At the same time, the high thermal radiation coefficient of graphene materials can be used to dissipate heat to avoid excessive operating temperature and serious heat accumulation of the curved heat dissipation tile packaging structure 1, greatly improving the power generation efficiency of the curved heat dissipation tile packaging structure 1. In addition, the insulating heat dissipation layer is very thin and soft, can adapt to various curves and shapes, and has good reprocessability, can be better combined with the shape of the curved tile, and better adapt to different application scenarios.

[0052] In this utility model, unless otherwise clearly specified or limited, the terms "installation", "connection" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, an integral connection, or a transmission connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0053] In addition, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as specific or special structures. The description of the term "some embodiments" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In the present utility model, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in the present utility model and the features of different embodiments or examples without contradiction.

[0054] The above implementation modes are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned implementation modes, a person skilled in the art should understand that the technical solutions described in the aforementioned implementation modes can still be modified, or some of the technical features can be replaced by equivalents. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various implementation modes of the present invention, and should all be included in the protection scope of the present invention.

Claims

1. A battery cell assembly, characterized in that: include: A battery sheet layer, wherein the battery sheet layer has a first surface and a second surface opposite to each other; A first encapsulation layer, disposed on the first surface; A second encapsulation layer, disposed on the second surface, and encapsulating the battery cell layer together with the first encapsulation layer; as well as An insulating heat dissipation layer, wherein the insulating heat dissipation layer is arranged on a surface of the second packaging layer away from the battery cell layer, the insulating heat dissipation layer comprises a substrate layer, a graphene layer and an adhesive layer, the substrate layer is an insulating layer and is bonded to the second packaging layer, the graphene layer is arranged on the substrate layer, the adhesive layer is arranged between the substrate layer and the graphene layer, and bonds the graphene layer and the substrate layer.

2. The battery cell assembly according to claim 1, characterized in that: The thickness of the first packaging layer is 200 μm-400 μm, the thickness of the second packaging layer is 200 μm-400 μm, and the thickness of the insulating heat dissipation layer is 80 μm-330 μm.

3. The battery cell assembly according to claim 1, characterized in that: The thickness of the substrate layer is 20 μm-100 μm.

4. The battery cell assembly according to claim 1, characterized in that: The thickness of the graphene layer is 50 μm-200 μm.

5. The battery cell assembly according to claim 1, characterized in that: The thickness of the adhesive layer is 10 μm-30 μm.

6. A curved heat dissipation tile packaging structure, characterized in that: include: The battery cell assembly according to any one of claims 1 to 5; A front plate, the front plate is arranged on a side of the first encapsulation layer away from the battery cell and connected to the first encapsulation layer; A back plate, the back plate is arranged on a side of the insulating heat dissipation layer away from the battery sheet and connected to the insulating heat dissipation layer; as well as The adhesive film is arranged between the battery cell assembly and the front plate and between the battery cell assembly and the back plate, and adheres the battery cell assembly and the front plate and the battery cell assembly and the back plate.

7. The curved heat sink packaging structure according to claim 6, characterized in that: The front plate is configured as an arc-shaped curved surface structure.

8. The curved heat sink packaging structure according to claim 6, characterized in that: The back plate and the battery cell assembly are both configured as arc-shaped curved surface structures.

9. The curved heat dissipation tile packaging structure according to claim 6, characterized in that: The curved surface radius of the front plate, the back plate and the battery cell assembly is 50mm-200mm.

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