Low-temperature photovoltaic welding strip

Abstract

The invention discloses a low-temperature photovoltaic welding strip which comprises a welding strip body, a protective layer, an insulating layer and a bonding layer, the welding strip body is provided with a first side and a second side, and the protective layer is coated on the surface of the welding strip body for protection. The protective layer is coated with the insulating layer and at least partially wraps the first side and the second side of the welding strip body, the protective layer is coated with the bonding layer and is located on the second side of the welding strip body, and the surface area of the insulating layer is larger than that of the bonding layer. The low-temperature photovoltaic solder strip provided by the invention has the advantages of low solder strip fixing temperature and small photovoltaic influence.

Description

Technical Field

[0001] The invention relates to the technical field of photovoltaic cells, and in particular to a low-temperature photovoltaic welding ribbon. Background Art

[0002] The soldering of the soldering tape in the related art usually requires a higher soldering temperature, which causes the photovoltaic cell to generate greater internal stress under the influence of temperature changes, and then easily causes the photovoltaic cell to break due to excessive stress. Therefore, the substrate of the photovoltaic cell is usually thicker, which is not conducive to the thinning of the product and the cost reduction of the production line. The poor bonding strength of the soldering tape is easy to fall off and affect the normal operation of the battery. Summary of the invention

[0003] The present invention aims to solve one of the technical problems in the related art at least to a certain extent.

[0004] To this end, an embodiment of the present invention provides a low-temperature photovoltaic welding ribbon, which has the advantages of low welding ribbon fixing temperature and little impact on photovoltaics.

[0005] According to an embodiment of the present invention, the low-temperature photovoltaic welding strip includes a welding strip body, a protective layer, an insulating layer and an adhesive layer, the welding strip body having a first side and a second side, the protective layer being coated on the surface of the welding strip body for protection, the insulating layer being coated on the protective layer and at least partially wrapping the first side and the second side of the welding strip body, the adhesive layer being coated on the protective layer and located on the second side of the welding strip body, and the surface area of ​​the insulating layer being greater than the surface area of ​​the adhesive layer.

[0006] The low-temperature photovoltaic welding ribbon according to the embodiment of the present invention has the advantages of low welding ribbon fixing temperature and little impact on photovoltaics.

[0007] In some embodiments, the solder strip body is provided with an expansion portion at a certain distance in the extension direction, and the adhesive layer is located on a side of the expansion portion which is located on the second side of the solder strip body.

[0008] In some embodiments, the adhesive layer includes a first adhesive layer and a second adhesive layer, and the first adhesive layer and the second adhesive layer are both located on the same side surface of the expansion portion.

[0009] In some embodiments, the first adhesive layer is disposed around the second adhesive layer.

[0010] In some embodiments, the first adhesive layer is a pressure-sensitive adhesive, and the second adhesive layer is a thermoplastic resin layer.

[0011] In some embodiments, a release paper is adhered to the surface of the pressure-sensitive adhesive to protect the pressure-sensitive adhesive.

[0012] In some embodiments, the thermoplastic resin layer is doped with conductive particles, and the conductive particles are one of silver, copper, and tin.

[0013] In some embodiments, an area of ​​the second bonding layer is greater than an area of ​​the first bonding layer.

[0014] In some embodiments, a surface between the expansion portion and any adjacent expansion portion on the second side of the solder strip body is wrapped with an insulating layer.

[0015] In some embodiments, the solder strip body is one of silver, copper, and aluminum. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 Schematic diagram of the structure of a low-temperature photovoltaic welding strip according to an embodiment of the present invention.

[0017] Figure 2 Schematic diagram of a top view of a low-temperature photovoltaic welding strip according to an embodiment of the present invention.

[0018] Figure numerals: 1. welding strip body; 2. protective layer; 3. insulating layer; 4. first bonding layer; 5. second bonding layer; 6. expansion part. DETAILED DESCRIPTION

[0019] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0020] According to the embodiment of the present invention, the low-temperature photovoltaic welding strip includes a welding strip body 1, a protective layer 2, an insulating layer 3 and an adhesive layer. The welding strip body 1 has a first side and a second side. The protective layer 2 is coated on the surface of the welding strip body 1 for protection. The insulating layer 3 is coated on the protective layer 2 and at least partially wraps the first side and the second side of the welding strip body 1. The adhesive layer is coated on the protective layer 2 and is located on the second side of the welding strip body 1. The surface area of ​​the insulating layer 3 is greater than the surface area of ​​the adhesive layer. The protective layer 2 can be a low-melting point alloy coating, such as an alloy coating of tin, indium, bismuth and copper. The protective layer 2 is used to prevent the welding strip body 1 from oxidation to extend its service life. The insulating layer 3 is wrapped on the welding strip body 1 and the protective layer 2 to have an insulating effect. The adhesive layer is used to bond and fix the welding strip to the photovoltaic without the need for high-temperature welding. The melting point of the alloy of the protective layer 2 is less than 150°C

[0021] The low-temperature photovoltaic welding ribbon according to the embodiment of the present invention has the advantages of low welding ribbon fixing temperature and little impact on photovoltaics.

[0022] In some embodiments, an expansion portion is disposed at a certain distance in the extension direction of the solder strip body 1 , and the adhesive layer is located on one side of the expansion portion located on the second side of the solder strip body 1 .

[0023] Specifically, the expansion portion increases the width of the welding strip body 1 in a direction perpendicular to the extension direction of the welding strip body 1. The expansion portion increases the contact surface area between the welding strip and the photovoltaic device by increasing the width, thereby improving the bonding strength of the bonding layer. The contact surface between the expansion portion and the photovoltaic device is flush with the contact surface between the welding strip and the photovoltaic device, thereby preventing the welding strip from warping up under stress and causing a weak bond.

[0024] In some embodiments, the adhesive layer includes a first adhesive layer 4 and a second adhesive layer 5, and the first adhesive layer 4 and the second adhesive layer 5 are both located on the same side surface of the expansion portion.

[0025] Specifically, the two adhesive layers improve the bonding effect. Different adhesive materials can achieve better bonding. The adhesive layer can use a variety of materials, such as hot melt adhesive, pressure sensitive adhesive, conductive adhesive, etc., and the appropriate material can be selected according to the specific application scenario. The adhesive layer can ensure a firm connection between the soldering ribbon body 1 and the battery cell to prevent the soldering ribbon from falling off.

[0026] In some embodiments, the first adhesive layer 4 is arranged around the second adhesive layer 5 .

[0027] Specifically, the first adhesive layer is arranged around the second adhesive layer to facilitate the processing and arrangement of the adhesive layers. The first adhesive layer can be an insulating adhesive layer, and the second adhesive layer is a conductive adhesive layer, which ensures the bonding strength while ensuring that the conductive effect of the welding strip is not affected.

[0028] In some embodiments, the first adhesive layer 4 is a pressure-sensitive adhesive, and the second adhesive layer 5 is a thermoplastic resin layer.

[0029] Specifically, the first adhesive layer uses a pressure-sensitive adhesive that can be bonded and fixed under pressure to provide accurate positioning for the expansion part to prevent the solder strip from falling off. The thermoplastic resin layer can firmly fix the expansion part and the photovoltaic after being heated. The working temperature of the thermoplastic resin is lower than the commonly used welding temperature, which can reduce the damage of high temperature to the photovoltaic and prevent the adhesive layer from failing and falling off during the subsequent lamination process. The pressure-sensitive adhesive provides rapid bonding and initial bonding force, and the thermoplastic resin layer provides long-term and stable bonding force. The combination of the two can give full play to their respective advantages and improve the reliability and safety of the solder strip.

[0030] In some embodiments, a release paper is attached to the surface of the pressure-sensitive adhesive to protect the pressure-sensitive adhesive.

[0031] Specifically, when the release paper is pasted on the surface of the pressure-sensitive adhesive, the two adhesive layers can be covered and protected to prevent the adhesive layers from being contaminated and affecting the adhesive effect.

[0032] In some embodiments, the thermoplastic resin layer is doped with conductive particles, and the conductive particles are one of silver, copper, and tin.

[0033] Specifically, doping with conductive particles can make the second adhesive layer 5 conductive, thereby ensuring the connection effect of the soldering tape to the photovoltaic upper grid line.

[0034] In some embodiments, the area of ​​the second adhesive layer 5 is greater than the area of ​​the first adhesive layer 4 .

[0035] Specifically, the area of ​​the second adhesive layer 5 is larger than the area of ​​the first adhesive layer 4 so as to ensure the connection strength of the thermoplastic resin and the conductive connection effect of the soldering tape.

[0036] In some embodiments, the surface between the expansion portion and any adjacent expansion portion on the second side of the solder strip body 1 is wrapped with an insulating layer 3 .

[0037] Specifically, the insulating layer 3 can prevent the short circuit between the soldering ribbon body 1 and the battery cell, thereby improving the reliability and safety of the soldering ribbon. It is understandable that only the expanded portion of the soldering ribbon body 1 plays a role in conductive connection, thereby reducing the risk of short circuit between the soldering ribbon and the battery cell. The insulating layer 3 can be made of materials with excellent insulating properties such as polyimide and polytetrafluoroethylene.

[0038] In some embodiments, the solder strip body 1 is made of one of silver, copper and aluminum.

[0039] Specifically, the welding strip body 1 is made of conductive metal to ensure the conductive effect and can be processed to be flatter, thereby reducing the shielding and impact on photovoltaics.

[0040] In the description of the present invention, it is to be understood that 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., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0041] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0042] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; 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 the present invention can be understood according to specific circumstances.

[0043] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a 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. A first feature being "below", "below" or "below" a 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.

[0044] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean 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 present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0045] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. Changes, modifications, substitutions and variations of the above embodiments by those of ordinary skill in the art are all within the scope of protection of the present invention.

Claims

1. A low-temperature photovoltaic welding ribbon, characterized in that: include: A solder strip body having a first side and a second side; A protective layer, the protective layer is coated on the surface of the welding strip body for protection; An insulating layer, the insulating layer being coated on the protective layer and at least partially wrapping the first side and the second side of the welding ribbon body; An adhesive layer is coated on the protective layer and is located on the second side of the solder strip body, and the surface area of ​​the insulating layer is greater than the surface area of ​​the adhesive layer.

2. The low-temperature photovoltaic welding tape according to claim 1, characterized in that: The solder strip body is provided with an expansion portion at a certain interval in the extension direction, and the adhesive layer is located on a side of the expansion portion located on the second side of the solder strip body.

3. The low-temperature photovoltaic welding strip according to claim 2, characterized in that: The adhesive layer includes a first adhesive layer and a second adhesive layer, and the first adhesive layer and the second adhesive layer are both located on the same side surface of the expansion portion.

4. The low-temperature photovoltaic welding strip according to claim 3, characterized in that: The first adhesive layer is arranged around the second adhesive layer.

5. The low-temperature photovoltaic welding ribbon according to claim 3, characterized in that: The first adhesive layer is a pressure-sensitive adhesive, and the second adhesive layer is a thermoplastic resin layer.

6. The low-temperature photovoltaic welding strip according to claim 5, characterized in that: Release paper is pasted on the surface of the pressure-sensitive adhesive to protect the pressure-sensitive adhesive.

7. The low-temperature photovoltaic welding ribbon according to claim 5, characterized in that: The thermoplastic resin layer is doped with conductive particles, and the conductive particles are one of silver, copper and tin.

8. The low-temperature photovoltaic welding ribbon according to claim 4, characterized in that: The area of ​​the second adhesive layer is greater than that of the first adhesive layer.

9. The low-temperature photovoltaic welding ribbon according to claim 2, characterized in that: The surface between the expansion portion and any adjacent expansion portion on the second side of the welding strip body is wrapped with an insulating layer.

10. The low-temperature photovoltaic welding ribbon according to claim 1, characterized in that: The welding strip body is made of one of silver, copper and aluminum.

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