Photovoltaic module
By setting transparent conductive films on both the front and back of the cell of the photovoltaic module, the problem of PID and DH in high temperature and high humidity conditions is solved, which improves the reliability and power of the module and reduces costs.
Patent Information
- Application Number
- CN202421418151.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-20
- Publication Date
- 2025-04-25
- Estimated Expiration
- 2034-06-20
AI Technical Summary
Existing photovoltaic modules are prone to PID and DH under high temperature and high humidity conditions, resulting in shortening of power attenuation and service life, and the cost is higher when using high volume resistivity materials to increase reliability.
Transparent conductive films are provided on both front and back sides of the battery cell, and the transparent conductive film is closely attached to the side of the welding tape away from the battery cell. Water vapor is isolated by the arrangement of the transparent conductive film, and the migration of Na ions in the glass is blocked under the external electric field, thereby enhancing the reliability of the components.
Through the arrangement of transparent conductive film, water vapor isolates and improves the current collection capacity of the cell, reduces resistance, improves the power and reliability of photovoltaic modules, while reducing costs.
Smart Images
Figure CN222803324U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of photovoltaic power generation technology, and in particular to photovoltaic modules. Background Art
[0002] At present, high-efficiency battery technology is developing rapidly, and the requirements for photovoltaic module packaging are also increasing. It is necessary to meet high power while ensuring the reliability of the module. At present, PERC or Topcon or HJT process cells are sensitive to water vapor, and there are risks in PID (voltage induced degradation) test and DH (damp heat) test under high temperature and high humidity conditions. Among them, the main mechanism of PID is: in a high temperature and high humidity environment and under high voltage for a long time, leakage current will be generated between the glass and the packaging material. The leakage current will change the state of the carrier and depletion layer of the cell, the resistor and packaging material in the circuit will be electrochemically corroded, and the cell power will be attenuated and the transmittance will be reduced, thereby affecting the power generation and service life of the module; the main mechanism of DH is the appearance of hot spots inside the photovoltaic module, which may be the withdrawal or destruction of a single or multiple cells. The withdrawn cells will block the current and cause hot spots. When the current passes through this hot spot, it will cause the local temperature to rise, reaching or even higher than the peak temperature of the photovoltaic design temperature of the module, which will cause local damage to the photovoltaic module or even failure. In the related art, high volume resistivity materials such as POE are generally used to increase the reliability of photovoltaic modules. However, the use of high volume resistivity materials has the problem of high cost. Utility Model Content
[0003] Based on this, it is necessary to provide a photovoltaic module in view of the problem that in the prior art, high volume resistivity materials are generally used to increase the reliability of photovoltaic modules, which has the problem of high cost.
[0004] A photovoltaic module, comprising:
[0005] A battery string, comprising a welding strip and a plurality of battery cells, wherein the welding strips are respectively arranged on the front and back sides of the battery cells, and two adjacent battery cells are connected by the welding strips; and
[0006] A transparent conductive film is disposed on the front and back sides of the battery cell respectively, and the soldering strip is located between the transparent conductive film and the battery cell, and the transparent conductive film is bonded to the soldering strip.
[0007] In one embodiment, the front and back sides of each battery cell are respectively provided with corresponding transparent conductive films, and the size of the transparent conductive films is less than or equal to the size of the corresponding battery cell.
[0008] In one embodiment, the front sides of the plurality of battery cells in the battery string share the same transparent conductive film, and the back sides of the plurality of battery cells in the battery string share the same transparent conductive film.
[0009] In one embodiment, the thickness of the transparent conductive film is 0.05 mm-0.2 mm.
[0010] In one of the embodiments, a surface of the transparent conductive film on a side away from the soldering strip is uneven.
[0011] In one of the embodiments, a plurality of pyramid structures are disposed on a surface of the transparent conductive film that is away from the battery cell.
[0012] In one embodiment, the photovoltaic module includes a front packaging film and a back packaging film, and the front packaging film, the transparent conductive film on the front of the battery cell, a plurality of the battery cells, the transparent conductive film on the back of the battery cell, and the back packaging film are laminated in sequence.
[0013] In one embodiment, the photovoltaic module further includes a front panel, a back panel and a sealant, wherein the front panel is arranged on a side of the front packaging film away from the battery string, the back panel is arranged on a side of the back packaging film away from the battery string, and the sealant wraps the edges of the front panel and the back panel.
[0014] In one embodiment, the sealing member is a metal film, and the metal film is bonded to the front panel and the back panel respectively.
[0015] In one of the embodiments, the length and width of the battery cell are both greater than or equal to 156 mm, and among two adjacent battery cells, the front side of one battery cell is connected to the back side of the other battery cell through 10-30 welding ribbons.
[0016] The photovoltaic module is provided with transparent conductive films on both sides of the cell, and the transparent conductive films are closely attached to the side of the welding strip away from the cell. The transparent conductive films can isolate water vapor. At the same time, during the PID test, due to the presence of an external electric field, Na ions in the glass are blocked by the transparent conductive films in the process of migrating toward the cell, thereby improving the reliability of the module. In addition, the conductivity of the transparent conductive films can increase the ability of the cell to collect current, thereby reducing resistance and improving the power of the photovoltaic module. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 Schematic diagram of the structure of a photovoltaic module in one embodiment.
[0018] Figure 2 FIG. 4 is a schematic diagram of the structure of a photovoltaic module in another embodiment.
[0019] Reference numerals: 10, battery cell; 20, soldering tape; 30, transparent conductive film; 40, front packaging film; 50, back packaging film; 60, front panel; 70, back panel; 80, sealing member. DETAILED DESCRIPTION
[0020] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.
[0021] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.
[0022] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.
[0023] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.
[0024] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.
[0025] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.
[0026] See also Figure 1 , a photovoltaic module provided by an embodiment of the present application, the photovoltaic module includes a battery string and a transparent conductive film 30. The battery string includes a welding strip 20 and a plurality of battery cells 10, the front and back sides of the battery cell 10 are respectively provided with welding strips 20, and two adjacent battery cells 10 are connected by the welding strips 20. The front and back sides of the battery cell 10 are respectively provided with transparent conductive films 30, and the welding strips 20 are arranged between the transparent conductive films 30 and the battery cell 10, and the transparent conductive films 30 and the welding strips 20 are closely attached.
[0027] In this embodiment, transparent conductive films 30 are respectively arranged on the front and back sides of the cell 10, and the soldering strip 20 is arranged between the transparent conductive film 30 and the cell 10. The arrangement of the transparent conductive film 30 can isolate water vapor. At the same time, during the PID test, due to the presence of an external electric field, Na ions in the glass are blocked by the transparent conductive film 30 in the process of migrating toward the cell 10, thereby improving the reliability of the component. In addition, the conductivity of the transparent conductive film 30 can increase the ability of the cell 10 to collect current, thereby reducing resistance and improving the power of the photovoltaic component.
[0028] In some embodiments, in combination Figure 1 There are multiple transparent conductive films 30 , and corresponding transparent conductive films 30 are respectively arranged on the front and back sides of each battery cell 10 , and the size of the transparent conductive film 30 is less than or equal to the size of the corresponding battery cell 10 .
[0029] In this embodiment, the transparent conductive film 30 only wraps the front and back sides of the battery cell 10, and the transparent conductive film 30 is not set in the gap between two adjacent battery cells 10, which can reduce the usage of the transparent conductive film 30 and reduce the cost. The transparent conductive film 30 is set on the front and back sides of the battery cell 10 to block water vapor.
[0030] In some embodiments, in combination Figure 2 The front sides of the plurality of battery cells 10 in the battery string share the same transparent conductive film 30 , and the back sides of the plurality of battery cells 10 in the battery string share the same transparent conductive film 30 .
[0031] That is, the transparent conductive films 30 on the front sides of the plurality of battery cells 10 are connected to each other to simultaneously cover the front sides of the battery cells 10, and the transparent conductive films 30 on the back sides of the plurality of battery cells 10 are connected to each other to simultaneously cover the back sides of the battery cells 10, that is, the transparent conductive films 30 simultaneously cover the gap between two adjacent battery cells 10, thereby further preventing water vapor from invading the battery cells 10 from between two adjacent battery cells 10.
[0032] In some embodiments, the thickness of the transparent conductive film 30 is 0.05 mm-0.2 mm.
[0033] In some embodiments, the surface of the transparent conductive film 30 away from the soldering ribbon 20 is uneven. The uneven surface is used to increase and reduce light reflection, increase light absorption, and thus increase the conversion efficiency of the photovoltaic module.
[0034] In some embodiments, a plurality of pyramid structures are disposed on a surface of the transparent conductive film 30 that is away from the battery cell 10 .
[0035] The transparent conductive film 30 has a surface away from the welding strip 20 and a plurality of pyramid structures, that is, a surface away from the cell 10 and a plurality of pyramid structures, for increasing the light absorption rate of the cell 10 and thus increasing the conversion efficiency of the photovoltaic module.
[0036] In some other embodiments, a zigzag structure is disposed on a surface of the transparent conductive film 30 away from the soldering ribbon 20 .
[0037] In some embodiments, the photovoltaic module includes a front packaging film 40 and a back packaging film 50, and the front packaging film 40, the transparent conductive film 30 on the front of the battery cell 10, multiple battery cells 10, the transparent conductive film 30 on the back of the battery cell 10, and the back packaging film 50 are laminated together in sequence.
[0038] In this embodiment, the front packaging film 40, the transparent conductive film 30 on the front of the battery cell 10, multiple battery cells 10, the transparent conductive film 30 on the back of the battery cell 10, and the back packaging film 50 are laminated and combined in sequence, so that the transparent conductive film 30 can squeeze the welding ribbon 20 so that the welding ribbon 20 is tightly combined with the surface of the battery cell 10, avoiding the problem of power reduction of the entire photovoltaic module due to empty welding of the welding ribbon 20.
[0039] It should be noted that in order to clearly display the internal structure of the photovoltaic module, Figure 1 and Figure 2 The front packaging film 40, the transparent conductive film 30, the battery string, the transparent conductive film 30, and the back packaging film 50 in the photovoltaic module are in a disassembled state.
[0040] The front encapsulation film 40 and the back encapsulation film 50 may be EVA film or POE film. POE film has good water barrier properties, but is relatively expensive.
[0041] Furthermore, the photovoltaic module also includes a front panel 60, a back panel 70 and a sealant 80. The front panel 60 is arranged on the side of the front packaging film 40 away from the battery string, and the back panel 70 is arranged on the side of the back packaging film 50 away from the battery string. The sealant 80 wraps the edges of the front panel 60 and the back panel 70.
[0042] By wrapping the edges of the front panel 60 and the back panel 70 with the seal 80, water vapor can be prevented from entering the photovoltaic module from the edges to corrode the battery cell 10, and the water-blocking requirements of the packaging film in the photovoltaic module can be further reduced. For example, POE film can be switched to EVA film to reduce the cost of the photovoltaic module.
[0043] In some of the embodiments, the sealing member 80 is wrapped with a metal film, and the metal film is bonded to the front panel 60 and the back panel 70 respectively.
[0044] Specifically, the coverage area of the metal film on the edges of the front panel 60 and the back panel 70 can be increased, thereby increasing the sealing performance of the metal film, preventing water vapor from entering the photovoltaic module from the edge, and improving the reliability of the photovoltaic module. The metal film can be a metal aluminum foil.
[0045] In some other embodiments, the front panel 60 and the back panel 70 are both glass panels, the sealing member 80 is made of glass, and the sealing member 80 is melted and covers the outer edges of the front panel 60 and the back panel 70 .
[0046] In some embodiments, the length and width of the battery cell 10 are both greater than or equal to 156 mm, and among two adjacent battery cells 10 , the front side of one battery cell 10 is connected to the back side of the other battery cell 10 via 10-30 welding ribbons 20 .
[0047] Furthermore, the front side of one of the cells 10 can be connected to the back side of another cell 10 through 25-30 solder strips 20. The transparent conductive film 30 can improve the current collection capability of a single cell 10, and by increasing the number of solder strips 20, the current conduction capability between two adjacent cells 10 can be further improved. The cell 10 can be a rectangular or square structure. The solder strips 20 are soldered on the cell 10.
[0048] The present application sets a transparent conductive film 30 on both the front and back sides of the battery cell 10, and the transparent conductive film 30 is closely attached to the side of the welding strip 20 away from the battery cell 10. The setting of the transparent conductive film 30 can isolate water vapor. At the same time, during the PID test, due to the existence of the external electric field, the Na ions in the glass are blocked by the transparent conductive film 30 in the process of migrating toward the battery cell 10, thereby improving the reliability of the component. The conductivity of the transparent conductive film 30 can increase the ability of the battery cell 10 to collect current, thereby reducing resistance and improving the power of the photovoltaic module. At the same time, the front packaging film 40, the transparent conductive film 30, the battery string, the transparent conductive film 30, and the back packaging film 50 are laminated and combined in sequence so that the transparent conductive film 30 can squeeze the welding strip 20 so that the welding strip 20 is closely combined with the surface of the battery cell 10, avoiding the problem of power reduction of the entire photovoltaic module due to empty welding of the welding strip 20.
[0049] The metal film includes the edges of the front panel 60 and the back panel 70 to prevent water vapor from entering the photovoltaic module from the edges, thereby improving the reliability of the photovoltaic module. At the same time, it can further reduce the water blocking requirements of the packaging film in the photovoltaic module. For example, the POE film can be switched to the EVA film to reduce the cost of the photovoltaic module.
[0050] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0051] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.
Claims
1. A photovoltaic module, characterized in that: The photovoltaic module comprises: A battery string, comprising a welding strip and a plurality of battery cells, wherein the welding strips are respectively arranged on the front and back sides of the battery cells, and two adjacent battery cells are connected by the welding strips; and A transparent conductive film is disposed on the front and back sides of the battery cell respectively, and the soldering strip is located between the transparent conductive film and the battery cell, and the transparent conductive film is bonded to the soldering strip.
2. The photovoltaic module according to claim 1, characterized in that: The front and back sides of each battery cell are respectively provided with corresponding transparent conductive films, and the size of the transparent conductive films is smaller than or equal to the size of the corresponding battery cell.
3. The photovoltaic module according to claim 1, characterized in that: The front sides of the plurality of battery cells in the battery string share the same transparent conductive film, and the back sides of the plurality of battery cells in the battery string share the same transparent conductive film.
4. The photovoltaic module according to claim 1, characterized in that: The thickness of the transparent conductive film is 0.05 mm-0.2 mm.
5. The photovoltaic module according to claim 1, characterized in that: The surface of the transparent conductive film on one side away from the welding strip is uneven.
6. The photovoltaic module according to claim 5, characterized in that: A plurality of pyramid structures are arranged on a surface of one side of the transparent conductive film away from the battery sheet.
7. The photovoltaic module according to claim 1, characterized in that: The photovoltaic module includes a front packaging film and a back packaging film. The front packaging film, the transparent conductive film on the front of the battery cell, a plurality of the battery cells, the transparent conductive film on the back of the battery cell, and the back packaging film are laminated in sequence.
8. The photovoltaic module according to claim 7, characterized in that: The photovoltaic module also includes a front panel, a back panel and a sealant. The front panel is arranged on a side of the front packaging film away from the battery string, and the back panel is arranged on a side of the back packaging film away from the battery string. The sealant wraps the edges of the front panel and the back panel.
9. The photovoltaic module according to claim 8, characterized in that: The sealing member is a metal film, and the metal film is bonded to the front panel and the back panel respectively.
10. The photovoltaic module according to claim 1, characterized in that: The length and width of the battery cell are both greater than or equal to 156 mm. Among two adjacent battery cells, the front side of one battery cell is connected to the back side of the other battery cell through 10 to 30 welding strips.