Packaging structure of back contact battery

Abstract

The utility model relates to a packaging structure of a back contact battery. The packaging structure comprises a first packaging layer, a second packaging layer, a third packaging layer, a first coating layer and a second coating layer, the first packaging layer and the second packaging layer are sequentially stacked on the first surface of the back contact battery; the third packaging layer is arranged on the second surface of the back contact battery; the first coating layer coats the side surface of the back contact battery and the third packaging layer; the second coating layer coats the first coating layer; the first packaging layer is detachably connected with the second packaging layer; the first packaging layer and the second packaging layer are transparent; the inner filling materials of the first coating layer and the second coating layer are different; wherein the first surface of the back contact cell is a solar energy acting surface, and the second surface of the back contact cell is a surface where an electrode is located. According to the technical scheme, the first packaging layer can be easily detached and replaced, and the problem that the back contact battery is damaged when the first packaging layer is replaced can be prevented.

Description

Technical Field

[0001] This application relates to the field of solar cell technology, and more particularly to a packaging structure for a back-contact cell. Background Technology

[0002] Back-contact solar cells, also known as interdigitated back-contact solar cells, are a type of back-contact solar cell. The most significant characteristic of back-contact solar cells is that both the emitter and base electrodes are located on the back of the cell, thus reducing shading and improving photoelectric conversion efficiency. Improving the efficiency and reducing the cost of solar cells remains an important and ongoing research topic.

[0003] Because back-contact solar cells are installed in open-air environments and continuously exposed to sunlight, their solar-facing surface (the front of the back-contact cell) typically has a protective film and an anti-reflective film. The protective film is usually made of tempered glass. However, even tempered glass, under prolonged exposure to sunlight, ultraviolet radiation will still accelerate the aging of the glass surface, potentially causing micro-cracks or discoloration. Furthermore, high temperatures can alter the stress distribution within the glass material, possibly affecting its overall strength. Moreover, as the front of the back-contact cell, it bears a larger area from rain impacts, therefore requiring regular inspection of the protective film to promptly detect and address any potential damage or aging. When the protective film is damaged or aged, it needs to be replaced. Existing protective films are usually integrated with the back-contact cell, making disassembly difficult and easily damaging the cell itself. Summary of the Invention

[0004] To overcome, to some extent, the problem of difficulty in removing the protective film of the back contact battery in the related technology and the easy damage to the back contact battery itself during removal, this application provides a packaging structure for the back contact battery.

[0005] The proposed solution is as follows:

[0006] A back-contact battery encapsulation structure, comprising:

[0007] First encapsulation layer, second encapsulation layer, third encapsulation layer, first overlay layer, and second overlay layer;

[0008] The first encapsulation layer and the second encapsulation layer are stacked sequentially on the first side of the back contact battery;

[0009] The third encapsulation layer is disposed on the second side of the back contact battery;

[0010] The first covering layer covers the side of the back contact battery and the third encapsulation layer;

[0011] The second coating layer covers the first coating layer;

[0012] The first encapsulation layer and the second encapsulation layer are detachably connected;

[0013] The first and second encapsulation layers are transparent;

[0014] The inner filling materials of the first and second covering layers are different;

[0015] The first side of the back contact battery is the solar energy surface, and the second side of the back contact battery is the electrode surface.

[0016] Preferably, the first covering layer is filled with a rigid material;

[0017] The second coating layer is filled with a flexible material.

[0018] Preferably, the outer surface of the second coating layer has a grid pattern.

[0019] Preferably, the bottom surface of the second coating layer is provided with a plurality of arc-shaped grooves;

[0020] The concave surface of the arc-shaped groove faces the second side that is in back contact with the battery;

[0021] The top of the arc-shaped groove contacts the first covering layer;

[0022] The bottom end of the arc-shaped groove is exposed on the outer side of the bottom surface of the second covering layer;

[0023] An arc-shaped spring piece is provided inside the arc-shaped groove;

[0024] The bottom surface of the second coating layer is the surface corresponding to the second surface of the back contact battery.

[0025] Preferably, the arc-shaped grooves are arranged in pairs to form a cross structure.

[0026] Preferably, the second covering layer has multiple wavy grooves on its side surface;

[0027] The wavy groove is equipped with a wavy spring piece.

[0028] Preferably, a plurality of cross-shaped grooves are provided in the bottom surface of the first covering layer;

[0029] The cross-shaped groove is set at an angle of 45°;

[0030] The top of the cross-shaped groove contacts the third encapsulation layer;

[0031] The bottom end of the cross-shaped groove contacts the second covering layer;

[0032] A cross-shaped rigid bar is provided inside the cross-shaped groove;

[0033] The hardness of the cross-shaped rigid rod is greater than the hardness of the rigid material filled in the first coating layer.

[0034] The bottom surface of the first coating layer is the surface corresponding to the second surface of the back contact battery.

[0035] Preferably, the lower edge of the first encapsulation layer has a protrusion, and the upper edge of the second encapsulation layer has a groove corresponding to the protrusion;

[0036] Alternatively, the lower edge of the first encapsulation layer has a groove, and the upper edge of the second encapsulation layer has a protrusion corresponding to the groove.

[0037] Preferably, the encapsulation structure of the back contact battery further includes: a shock-absorbing layer;

[0038] The shock-absorbing layer is disposed between the first covering layer and the third encapsulation layer;

[0039] The damping layer has a three-layer stacked structure, with the damping level increasing from top to bottom.

[0040] Preferably, the surface of the first encapsulation layer is covered with a waterproof membrane;

[0041] The edge of the first encapsulation layer extends downward and covers the side of the second encapsulation layer;

[0042] The edge of the first encapsulation layer extends diagonally downward and bends to meet the outside of the second encapsulation layer.

[0043] The technical solution provided in this application may include the following beneficial effects:

[0044] The encapsulation structure of the back contact battery in this application includes: a first encapsulation layer, a second encapsulation layer, a third encapsulation layer, a first covering layer, and a second covering layer; the first encapsulation layer and the second encapsulation layer are sequentially stacked on the first side of the back contact battery; the third encapsulation layer is disposed on the second side of the back contact battery; the first covering layer covers the side of the back contact battery and the third encapsulation layer; the second covering layer covers the first covering layer; the first encapsulation layer and the second encapsulation layer are detachably connected; the first encapsulation layer and the second encapsulation layer are transparent; the internal filling materials of the first covering layer and the second covering layer are different; wherein, the first side of the back contact battery is the solar energy application surface, and the second side of the back contact battery is the electrode surface.

[0045] In this technical solution, the first encapsulation layer serves as a protective layer on top of the overall encapsulation structure, and the second encapsulation layer is an anti-reflective film. The first and second encapsulation layers are detachably connected, allowing for easy removal and replacement of the first encapsulation layer if it becomes worn. Since the electrodes of the back contact battery are all located on the back side, this application also uses a third encapsulation layer to protect the electrodes. Furthermore, the first covering layer covers the sides of the back contact battery and the third encapsulation layer, while the second covering layer covers the first covering layer. This effectively protects the sides and bottom of the back contact battery with two covering layers. The different filling materials of the first and second covering layers result in different protective orientations; for example, the first covering layer primarily provides protection, while the second covering layer primarily provides shock absorption. This better prevents damage to the back contact battery itself when replacing the first encapsulation layer.

[0046] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0047] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0048] Figure 1 This is a schematic diagram of the packaging structure of a back contact battery according to an embodiment of this application;

[0049] Figure 2 This is a schematic diagram of the specific structure of the second covering layer in the encapsulation structure of a back contact battery provided in one embodiment of this application;

[0050] Figure 3 This is a schematic diagram of an arc-shaped groove cross structure provided in one embodiment of this application;

[0051] Figure 4 This is a schematic diagram of the specific structure of the second covering layer in the encapsulation structure of a back contact battery provided in another embodiment of this application;

[0052] Figure 5 This is a schematic diagram of the specific structure of the first covering layer in the encapsulation structure of a back contact battery provided in one embodiment of this application;

[0053] Figure 6 This is a schematic diagram of the packaging structure of a back contact battery provided in another embodiment of this application;

[0054] Figure 7 This is a schematic diagram of a detachable connection structure between a first encapsulation layer and a second encapsulation layer provided in one embodiment of this application;

[0055] Figure 8 This is a schematic diagram of the packaging structure of a back contact battery according to another embodiment of this application;

[0056] Figure 9 This is a schematic diagram of the packaging structure of a back contact battery provided in another embodiment of this application.

[0057] Reference numerals: First encapsulation layer -1; Second encapsulation layer -2; Third encapsulation layer -3; First covering layer -4; Second covering layer -5; Shock-absorbing layer -6. Detailed Implementation

[0058] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0059] Example 1

[0060] A back-contact battery encapsulation structure, comprising:

[0061] First encapsulation layer 1, second encapsulation layer 2, third encapsulation layer 3, first covering layer 4, and second covering layer 5;

[0062] The first encapsulation layer 1 and the second encapsulation layer 2 are stacked sequentially on the first side of the back contact battery;

[0063] The third encapsulation layer 3 is disposed on the second side of the back contact battery;

[0064] The first covering layer 4 covers the side of the back contact battery and the third encapsulation layer 3;

[0065] The second coating layer 5 covers the first coating layer 4;

[0066] The first encapsulation layer 1 and the second encapsulation layer 2 are detachably connected;

[0067] The first encapsulation layer 1 and the second encapsulation layer 2 are transparent;

[0068] The inner filling materials of the first covering layer 4 and the second covering layer 5 are different;

[0069] The first side of the back contact battery is the solar energy surface, and the second side of the back contact battery is the electrode surface.

[0070] It should be noted that in this embodiment, the first encapsulation layer 1 is located on top of the overall encapsulation structure as a protective layer.

[0071] The second encapsulation layer 2 is an anti-reflective film, which is directly and fixedly connected to the first side of the battery in back contact.

[0072] Since the electrodes of the back contact battery are all located on the back side, the electrodes of the back contact battery are also protected by a third encapsulation layer 3.

[0073] In this technical solution, the first encapsulation layer 1 serves as a protective film at the top of the overall encapsulation structure, and the second encapsulation layer 2 is an anti-reflective film. The first encapsulation layer 1 and the second encapsulation layer 2 are detachably connected. If the first encapsulation layer 1 is worn, it can be easily removed and replaced.

[0074] In this technical solution, the sides of the back contact battery and the third encapsulation layer 3 are also covered by the first covering layer 4, and the first covering layer 4 is covered by the second covering layer 5. This is equivalent to protecting the sides and bottom of the back contact battery with two covering layers. Furthermore, the filling materials of the first covering layer 4 and the second covering layer 5 are different, which makes the protection tendencies of the first covering layer 4 and the second covering layer 5 different. For example, the first covering layer 4 mainly plays a protective role, while the second covering layer 5 mainly plays a shock absorption role. This can better prevent the back contact battery itself from being damaged when the first encapsulation layer 1 is replaced.

[0075] In practice, the first covering layer 4 is filled with rigid material;

[0076] The second covering layer 5 is filled with a flexible material.

[0077] Rigid materials are those that undergo only slight deformation or no deformation under external forces. They typically possess high elastic modulus and high melting point, and exhibit high strength and stiffness during processing and use. Common rigid materials include steel, aluminum alloys, ceramics, and glass.

[0078] Flexible materials are those that can undergo significant deformation or reversible deformation under external forces. They typically have low elastic modulus and low melting point, and exhibit good deformability and plasticity. Common flexible materials include rubber, plastics, and fiber materials.

[0079] Because rigid materials have high strength and rigidity, filling the first covering layer 4 with rigid materials can provide better protection for the entire back contact battery.

[0080] Because of its good deformability and plasticity, flexible material is filled in the second encapsulation layer 5, which is the outermost layer of the encapsulation, so that the back contact battery can be shock-absorbing at the first moment of collision.

[0081] Furthermore, the outer surface of the second covering layer 5 has a grid pattern.

[0082] The mesh pattern on the outer surface of the second encapsulation layer 5 increases friction, allowing for a more secure hold on the back contact battery when the first encapsulation layer 1 is replaced. This prevents the back contact battery from slipping during the replacement process.

[0083] Example 2

[0084] Reference Figure 2 The bottom surface of the second covering layer 5 is provided with multiple arc-shaped grooves. The concave surface of the arc-shaped grooves faces the second side of the back contact battery. The top of the arc-shaped grooves contacts the first covering layer 4. The bottom of the arc-shaped grooves is exposed on the outside of the bottom surface of the second covering layer 5. Arc-shaped springs are provided inside the arc-shaped grooves.

[0085] The bottom surface of the second coating layer 5 is the surface corresponding to the second surface of the back contact battery.

[0086] It is understood that in this embodiment, multiple arc-shaped grooves are provided in the bottom surface of the second covering layer 5, and the orientation of the arc-shaped grooves is as follows: Figure 2 As shown, the top of the arc-shaped groove contacts the first covering layer 4, and the bottom of the arc-shaped groove is exposed on the outer side of the bottom surface of the second covering layer 5. The shape of the arc-shaped spring piece matches the arc-shaped groove, so that the top of the arc-shaped spring piece directly contacts the first covering layer 4, and the bottom of the arc-shaped spring piece is exposed on the outer side of the bottom surface of the second covering layer 5. When the bottom of the back contact battery package contacts the ground or other surfaces, the arc-shaped spring piece will deform, reducing the impact force on the first covering layer 4.

[0087] It should be noted that the arc-shaped grooves are distributed at fixed intervals on the bottom surface of the second covering layer 5.

[0088] Furthermore, refer to Figure 3 The arc-shaped grooves form a cross structure in pairs, which makes the stress on the first covering layer 4 more uniform.

[0089] Example 3

[0090] Reference Figure 4 The second covering layer 5 has multiple wavy grooves on its inner side.

[0091] The inside of the wavy groove is equipped with a wavy spring.

[0092] It is understood that in this embodiment, multiple wavy grooves are provided on the side of the second covering layer 5, and wavy spring pieces are provided inside the wavy grooves. This allows the wavy spring pieces to deform when the back contact battery package side collides, thereby reducing the impact force on the first covering layer 4.

[0093] It should be noted that in this embodiment, a wavy spring is used on the side of the second covering layer 5, and an arc-shaped spring is used on the bottom. This is because the stress on the side is generally lower, while the bottom needs to support the entire back contact battery and its encapsulation, so the bottom has a greater load-bearing capacity and requires better load-bearing performance. Therefore, an arc-shaped spring is used on the bottom. The side does not have a large load-bearing requirement, so a wavy spring is sufficient.

[0094] Example 4

[0095] Reference Figure 5 The bottom surface of the first covering layer 4 is provided with multiple cross-shaped grooves, which are inclined at 45°. The top of the cross-shaped grooves contacts the third encapsulation layer 3, and the bottom of the cross-shaped grooves contacts the second covering layer 5. A cross-shaped rigid rod is provided inside the cross-shaped grooves. The hardness of the cross-shaped rigid rod is greater than the hardness of the rigid material filled in the first covering layer 4.

[0096] The bottom surface of the first covering layer 4 is the surface corresponding to the second surface of the back contact battery.

[0097] It should be noted that the bottom surface of the first covering layer 4 has multiple 45° cross-shaped grooves, also known as "×" shaped grooves. (Refer to...) Figure 4 The top of the cross-shaped groove contacts the third encapsulation layer 3, and the bottom contacts the second covering layer 5. The shape of the cross-shaped rigid rod matches the cross-shaped groove, thus providing support.

[0098] The design of the cross-shaped groove and cross-shaped rigid bar in this embodiment takes into account the possibility that the third encapsulation layer 3 may be punctured by the vertical rigid bar when using vertical rigid bar for support. Therefore, this embodiment adopts a 45° cross-shaped structure that can both provide support and decompose vertical forces.

[0099] In summary, the complete structure of the first coating layer 4 and the second coating layer 5 is as follows: Figure 6 As shown.

[0100] Example 5

[0101] This embodiment provides a detailed description of the detachable connection structure between the first encapsulation layer 1 and the second encapsulation layer 2.

[0102] Specifically:

[0103] The first encapsulation layer 1 has a protrusion at its lower edge, and the second encapsulation layer 2 has a groove at its upper edge corresponding to the protrusion.

[0104] Alternatively, the lower edge of the first encapsulation layer 1 has a groove, and the upper edge of the second encapsulation layer 2 has a protrusion corresponding to the groove.

[0105] Reference Figure 7The first encapsulation layer 1 has a protrusion at its lower edge, and the second encapsulation layer 2 has a groove at its upper edge corresponding to the protrusion. This allows the first encapsulation layer 1 to engage with the second encapsulation layer 2 through the protrusion below. Since the first encapsulation layer 1 only engages with the second encapsulation layer 2 and is not fixedly connected, it can be removed from the second encapsulation layer 2 by using a glass suction lifter or manually during disassembly.

[0106] Example 6

[0107] Reference Figure 8 The encapsulation structure of the back contact battery also includes: a shock-absorbing layer 6, which is disposed between the first covering layer 4 and the third encapsulation layer 3. The shock-absorbing layer 6 is a three-layer stacked structure, and the shock-absorbing level increases from top to bottom.

[0108] It is understandable that in this embodiment, the shock-absorbing layer 6, which is stacked in multiple layers and whose shock-absorbing level increases from top to bottom, achieves better shock absorption, thereby reducing the stress on the third encapsulation layer 3 and the back of the battery.

[0109] Example 7

[0110] Reference Figure 9 In this embodiment, the packaging structure of the back contact battery has a waterproof film covering the surface of the first packaging layer 1.

[0111] The edge of the first encapsulation layer 1 extends downward and covers the side of the second encapsulation layer 2;

[0112] The edge of the first encapsulation layer 1 extends diagonally downward and bends to meet the outer side of the second covering layer 5.

[0113] It should be noted that the surface of the first encapsulation layer 1 is covered with a waterproof membrane to provide waterproofing.

[0114] Reference Figure 9 The edge of the first encapsulation layer 1 extends downward and covers the side of the second encapsulation layer 2, which can better maintain the stability of the engagement between the first encapsulation layer 1 and the second encapsulation layer 2.

[0115] Reference Figure 9 The first encapsulation layer 1 extends obliquely downward and bends to fit the outside of the second covering layer 5, which can prevent water from entering the back contact battery from above and damaging the internal components of the back contact battery.

[0116] It is understood that the same or similar parts in the above embodiments can be referred to each other, and the contents not described in detail in some embodiments can be referred to the same or similar contents in other embodiments.

[0117] It should be noted that in the description of this application, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Furthermore, in the description of this application, unless otherwise stated, "a plurality of" means at least two.

[0118] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0119] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A packaging structure for a back-contact battery, characterized in that, include: First encapsulation layer, second encapsulation layer, third encapsulation layer, first overlay layer, and second overlay layer; The first encapsulation layer and the second encapsulation layer are stacked sequentially on the first side of the back contact battery; The third encapsulation layer is disposed on the second side of the back contact battery; The first covering layer covers the side of the back contact battery and the third encapsulation layer; The second coating layer covers the first coating layer; The first encapsulation layer and the second encapsulation layer are detachably connected; The first and second encapsulation layers are transparent; The inner filling materials of the first and second covering layers are different; The first side of the back contact battery is the solar energy surface, and the second side of the back contact battery is the electrode surface.

2. The packaging structure of the back contact battery according to claim 1, characterized in that, The first covering layer is filled with a rigid material; The second coating layer is filled with a flexible material.

3. The packaging structure of the back contact battery according to claim 2, characterized in that, The outer surface of the second coating layer has a grid pattern.

4. The packaging structure of the back contact battery according to claim 2, characterized in that, The bottom surface of the second coating layer is provided with multiple arc-shaped grooves; The concave surface of the arc-shaped groove faces the second side that is in back contact with the battery; The top of the arc-shaped groove contacts the first covering layer; The bottom end of the arc-shaped groove is exposed on the outer side of the bottom surface of the second covering layer; An arc-shaped spring piece is provided inside the arc-shaped groove; The bottom surface of the second coating layer is the surface corresponding to the second surface of the back contact battery.

5. The packaging structure of the back contact battery according to claim 4, characterized in that, The arc-shaped grooves are arranged in pairs to form a cross structure.

6. The packaging structure of the back contact battery according to claim 2, characterized in that, The second covering layer has multiple wavy grooves on its inner side; The wavy groove is equipped with a wavy spring piece.

7. The packaging structure of the back contact battery according to claim 2, characterized in that, The bottom surface of the first coating layer is provided with multiple cross-shaped grooves; The cross-shaped groove is set at an angle of 45°; The top of the cross-shaped groove contacts the third encapsulation layer; The bottom end of the cross-shaped groove contacts the second covering layer; A cross-shaped rigid bar is provided inside the cross-shaped groove; The hardness of the cross-shaped rigid rod is greater than the hardness of the rigid material filled in the first coating layer. The bottom surface of the first coating layer is the surface corresponding to the second surface of the back contact battery.

8. The packaging structure of the back contact battery according to claim 1, characterized in that, The first encapsulation layer has a protrusion at its lower edge, and the second encapsulation layer has a groove at its upper edge corresponding to the protrusion. Alternatively, the lower edge of the first encapsulation layer has a groove, and the upper edge of the second encapsulation layer has a protrusion corresponding to the groove.

9. The packaging structure of the back contact battery according to claim 1, characterized in that, Also includes: Vibration damping layer; The shock-absorbing layer is disposed between the first covering layer and the third encapsulation layer; The damping layer has a three-layer stacked structure, with the damping level increasing from top to bottom.

10. The packaging structure of the back contact battery according to claim 1, characterized in that, The surface of the first encapsulation layer is covered with a waterproof membrane; The edge of the first encapsulation layer extends downward and covers the side of the second encapsulation layer; The edge of the first encapsulation layer extends diagonally downward and bends to meet the outside of the second encapsulation layer.

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