Composite film for connecting bus bar and battery string
By using a composite film with conductive adhesive blocks on the bus bar, the welding tape and the bus bar are partially bonded, which solves the problem of excessive solder usage in the prior art, and achieves efficient welding connection.
Patent Information
- Application Number
- CN202323648456.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-29
- Publication Date
- 2025-02-07
- Estimated Expiration
- 2033-12-29
AI Technical Summary
The prior art is difficult to form a solder coating only on the bus bar, resulting in excessive solder usage.
Using a composite film, conductive adhesive blocks are pasted at intervals along the length of the release film. The conductive adhesive blocks contain conductive substrates and conductive voltage-sensitive adhesives for local mechanical connection of welding tapes and bus bars and conducting electricity. connect.
Through the use of composite film, the amount of bus bar solder can be effectively saved, and efficient bonding between the solder strip and the bus bar can be achieved, making the operation simple.
Smart Images
Figure CN222442188U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of photovoltaic components, in particular to a composite film used for connecting a bus bar and a battery string. Background Art
[0002] Busbars are commonly used to interconnect the cell strings of photovoltaic modules and collect the current derived from the cell strings. Busbars are flat strips with their surfaces fully coated with solder, such as tin or tin-containing alloys. The solder strips of the cell strings are only partially welded to the busbars, so most of the solder on the busbar surface is not needed.
[0003] The method for preparing the surface coating of the busbar is to immerse a flat metal strip in a pool of molten solder so that the surface of the metal strip is covered with a layer of solder. This method makes it difficult to form a solder coating only on a part of the busbar. Utility Model Content
[0004] In order to solve at least one technical problem of the prior art, the utility model provides a composite film and method for connecting a bus bar and a battery string, so as to save the amount of bus bar solder.
[0005] A composite film for connecting a busbar to a battery string, used for bonding a soldering strip of a solar cell string to a busbar, comprising: a release film in a strip shape having a release surface; and a plurality of conductive adhesive blocks which are adhered to the release surface of the release film at intervals along the length direction of the release film, wherein the conductive adhesive blocks comprise a conductive substrate and a conductive pressure-sensitive adhesive coated on both sides of the conductive substrate, and one side of the conductive adhesive block is bonded to the release surface.
[0006] In some embodiments, the conductive substrate includes one of copper foil, aluminum foil, non-woven fabric with a conductive layer plated on the surface, or polyamide with a conductive layer plated on the surface.
[0007] In some embodiments, the pressure sensitive adhesive is an acrylic adhesive filled with conductive particles.
[0008] In some embodiments, the conductive particles include one or more of carbon powder, silver powder, copper powder, and carbon nanotubes.
[0009] The conductive rubber block of the composite film has double-sided bonding ability and is conductive, and can be used to locally connect the welding strip to the bus bar mechanically and conductively. The composite film is in the form of a strip. When using it, cut a suitable length and transfer the conductive rubber block to the bus bar, which is easy to operate. The conductive rubber block uses a pressure-sensitive adhesive, and the welding strip can be bonded to the bus bar by gently pressing. BRIEF DESCRIPTION OF THE DRAWINGS
[0010] Figure 1 A partial front view of a composite film used for connecting a bus bar and a battery string according to an embodiment of the present disclosure is shown.
[0011] Figure 2 A partial side view of a composite film used for connecting a bus bar and a battery string according to an embodiment of the present disclosure is shown.
[0012] Figure 3 A partial front view of a composite film for connecting a bus bar and a battery string according to an embodiment of the present disclosure is shown when it is pasted on the bus bar.
[0013] Figure 4 Shows tear off Figure 3 Schematic diagram of the structure after the release film is shown. DETAILED DESCRIPTION
[0014] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.
[0015] In various embodiments of the present disclosure, please refer to Figure 1-2 The composite film for connecting the busbar and the battery string is used to bond the welding ribbon of the solar cell string to the busbar, including:
[0016] A release film 1 in a strip shape, having a release surface 2; and
[0017] There are multiple conductive rubber blocks 3, which are pasted on the release surface 2 of the release film 1 at intervals along the length direction of the release film 1. The conductive rubber blocks 3 include a conductive substrate 4 and a conductive pressure-sensitive adhesive 5 coated on both sides of the conductive substrate 4. One side of the conductive rubber block 3 is bonded to the release surface 2.
[0018] There is a certain adhesive force between the release surface 2 and the pressure-sensitive adhesive 5 of the conductive adhesive block 3, which can prevent the conductive adhesive block 3 from being separated from the release film 1, thereby facilitating the removal of the release film 1. The side of the release film 1 opposite to the release surface 2 has no release force, so that the composite film can be rolled into a roll, and a section can be cut from the roll when in use.
[0019] The pressure sensitive adhesive 5 is a type of adhesive that can be firmly bonded to the adherend by applying light finger pressure without the aid of solvents, heat or other means. The present disclosure applies the conductive tape to the interconnection of photovoltaic module cell strings, and the current of the welding tape is transmitted to the bus bar 7 through the front conductive pressure sensitive adhesive 5, the conductive substrate 4, and the back conductive pressure sensitive adhesive 5 in sequence.
[0020] The composite film disclosed in the present invention can be used for connecting uncoated busbars with welding strips. The busbar 7 is in the shape of a flat strip, and its surface does not have a solder coating. For example, the busbar can be a bare copper busbar. The spacing of the conductive rubber blocks 3 on the release film 1 can be selected according to the spacing of the welding strips of the battery string. Generally speaking, the spacing between the welding strips of the same battery string is 10-18mm, and the spacing between the welding strips of adjacent battery strings is 20-30mm.
[0021] When operating, please refer to Figure 3 and Figure 4 , stick the composite film on the bus bar 7, apply pressure gently on the surface of the composite film, so that the conductive rubber block 3 can be adhered to the first surface of the bus bar, and then tear off the release film 1. With this one-stick, one-press, one-tear method, it is very easy to transfer the conductive rubber block 3 from the release film 1 to the bus bar.
[0022] The conductive rubber block 3 of the composite film has double-sided bonding capability and is conductive, and can be used to locally mechanically connect the welding strip to the bus bar and to electrically connect the welding strip to the bus bar. The composite film is in the form of a strip, and when used, a suitable length is cut and the conductive rubber block 3 is transferred to the bus bar, which is easy to operate. The conductive rubber block 3 uses a pressure-sensitive adhesive 5, and the welding strip can be bonded to the bus bar by lightly pressing.
[0023] In one embodiment, the conductive substrate 4 includes one of copper foil, aluminum foil, non-woven fabric with a conductive layer plated on the surface, or polyamide with a conductive layer plated on the surface.
[0024] In one embodiment, the pressure sensitive adhesive 5 is an acrylic adhesive filled with conductive particles.
[0025] In one embodiment, the conductive particles include one or more of carbon powder, silver powder, copper powder, and carbon nanotubes.
[0026] In one embodiment, please refer to Figure 1 The release film 1 has a tearing hand 6 extending laterally. The tearing hand 6 can easily tear off the release film 1. Preferably, a mechanical hand is used to clamp the tearing hand 6 to tear off the release film 1.
[0027] The above are only some embodiments of the present invention. For those skilled in the art, several modifications and improvements can be made without departing from the inventive concept of the present invention, which all belong to the protection scope of the present invention.
Claims
1. A composite film for connecting a busbar to a battery string, used for bonding a soldering ribbon of a solar battery string to a busbar, characterized in that: include: The release film is in the form of a strip and has a release surface; as well as The conductive adhesive block has multiple conductive adhesive blocks, which are adhered to the release surface of the release film at intervals along the length direction of the release film. The conductive adhesive block includes a conductive substrate and a conductive pressure-sensitive adhesive coated on both sides of the conductive substrate. One side of the conductive adhesive block is bonded to the release surface.
2. The composite film for connecting busbars and battery strings according to claim 1, characterized in that: The conductive substrate comprises one of copper foil, aluminum foil, non-woven fabric with a conductive layer plated on the surface, or polyamide with a conductive layer plated on the surface.