CN217607770U

CN217607770U - Connecting structure of photovoltaic junction box and bus bar

Info

Publication number: CN217607770U
Application number: CN202220548813.4U
Authority: CN
Inventors: 杨摇; 刘增盛; 左玉成; 龚礼
Original assignee: Hunan Red Solar New Energy Science And Technology Co ltd
Current assignee: Hunan Red Solar New Energy Science And Technology Co ltd
Priority date: 2022-03-14
Filing date: 2022-03-14
Publication date: 2022-10-18
Anticipated expiration: 2032-03-14

Abstract

The utility model discloses a connection structure of photovoltaic terminal box and busbar, it has the connecting hole to open on the busbar, be equipped with the solder in the connecting hole, the lateral wall contact of solder and connecting hole, the bottom of solder and the welding terminal contact of photovoltaic terminal box, the connecting hole is passed at the top of solder to the circumference of connecting hole extends to the top contact with the busbar, forms welding boss. The utility model has the advantages of simple structure, reliable connection and the like.

Description

Connecting structure of photovoltaic junction box and bus bar

Technical Field

The utility model relates to a terminal box structural design technical field especially relates to a connection structure of photovoltaic terminal box and busbar.

Background

The electrical connection between the output bus bar of the laminated part of the photovoltaic module and the output junction box adopts a pure crimping method and a pure welding method, the pure crimping method requires that the strength of the junction box binding post meets certain requirements, the metal consumption is large, the production cost is high, and the junction box binding post is gradually eliminated. The welding method is the mainstream because the dosage is small and the quality of the finished product has certain reliability.

The conventional junction box is shown in fig. 1, a photovoltaic module bus bar 1 penetrates through a hole in the junction box and then is bent, specifically, as shown in fig. 1a, a welding material 3 covers a welding terminal 2 of the junction box, during operation, an operator heats the welding terminal 2 from the upper side of the junction box to a certain temperature, the welding material 3 is melted, the junction box welding terminal 2 and the junction box 1 are fused into a whole, and finally, the welding structure of the photovoltaic module bus bar 1 and the junction box is shown in fig. 1 b. This welded structure has the following disadvantages: 1) When the heating time and temperature are not enough, the melting degree of the solder 3 is not enough, and the bus bar 1 cannot be effectively infiltrated, so that the bonding strength between the solder 3 and the bus bar 1 is not enough, and the false soldering are caused. 2) The bus bar 1 has certain elasticity, and when the solder 3 is melted by heat, a certain pressure needs to be applied to the bus bar 1 to ensure that the bus bar 1, the solder 3 and the soldering terminal 2 can be in complete contact. If the operator does not apply pressure or the pressure application time is insufficient, it may result in three failing to weld or a false weld with too small a contact area. 3) After the solder 3 is melted and condensed, and soldering is completed, the bus bar 1 generally needs to be picked up upwards to confirm whether soldering is in place, but when the solder 3 is not completely condensed, such operation may result in a stress gap being formed in the condensation process of the solder 3, and the stress gap may become larger and larger in the use process of the photovoltaic module, thereby causing soldering failure.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is to overcome the not enough of prior art, provide a simple structure, connect reliable photovoltaic terminal box and busbar's connection structure.

In order to solve the technical problem, the utility model discloses take following technical scheme:

the utility model provides a connection structure of photovoltaic terminal box and busbar, it has the connecting hole to open on the busbar, be equipped with the solder in the connecting hole, the solder contacts with the lateral wall of connecting hole, the bottom of solder contacts with the welded terminal of photovoltaic terminal box, the connecting hole is passed at the top of solder to extend to the circumference of connecting hole and contact with the top of busbar, form welding boss.

As a further improvement of the technical scheme:

the bottom of the welding flux penetrates through the connecting hole and extends to the circumferential direction of the connecting hole to be contacted with the bottom of the bus bar, and a lower welding boss is formed.

The thickness of the upper welding boss is 0.1-0.2 mm.

The connecting hole is a round hole.

The connecting hole is a square hole.

The connecting holes are provided with a plurality of pairs, and each pair of connecting holes is respectively arranged at two sides of the bus bar.

The connecting hole is a semicircular hole.

The solder is soldering tin.

The thickness of the lower welding boss is 0.2-0.3 mm.

Compared with the prior art, the beneficial effects of the utility model reside in that: the utility model discloses a connection structure of photovoltaic terminal box and busbar sets up the connecting hole on the busbar, welds busbar and solder terminal through the solder, and the solder both contacts with the lateral wall of connecting hole, and the bottom contacts with the solder terminal again, and the connecting hole is passed at the top to extend to the circumference of connecting hole and contact with the top of busbar, form the welding boss, and welding area of contact is big, and it is effectual to weld; go up the welding boss and detain the busbar on the welding terminal, prevent that the not welded busbar from breaking away from terminal box welding terminal, strengthened the welded connection intensity of busbar and welding terminal, can fine reply and choose the inspection, need not to increase new material and structure, simple structure, the cost is lower, does benefit to and uses widely.

Drawings

Fig. 1 is a schematic view of a connection structure of a conventional junction box and a bus bar.

Fig. 2 is a schematic structural diagram of the connection structure of the photovoltaic junction box and the bus bar of the present invention before connection.

Fig. 3 is a schematic structural diagram of the connection structure of the photovoltaic junction box and the bus bar of the present invention after connection.

Fig. 4 is a schematic structural view of the connection hole of the present invention (c is a circular hole, d is a square hole, and e is a semicircular hole).

The reference numerals in the figures denote: 1. a bus bar; 11. connecting holes; 2. welding a terminal; 3. welding flux; 31. welding a boss; 32. and (5) welding a boss at the lower part.

Detailed Description

The invention is described in further detail below with reference to the drawings and specific examples.

Fig. 2 to 4 show the utility model discloses the connection structure of photovoltaic terminal box and busbar, the connection structure of photovoltaic terminal box and busbar of this embodiment, it has connecting hole 11 to open on the busbar 1, is equipped with solder 3 in the connecting hole 11, the lateral wall contact of solder 3 and connecting hole 11, the bottom of solder 3 and the welded terminal 2 contact of photovoltaic terminal box, connecting hole 11 is passed at the top of solder 3 to extend to the top contact with busbar 1 to the circumference of connecting hole 11, form welding boss 31.

According to the connecting structure of the photovoltaic junction box and the bus bar, the bus bar 1 is provided with the connecting hole 11, the bus bar 1 and the welding terminal 2 are welded through the welding flux 3, the welding flux 3 is in contact with the side wall of the connecting hole 11, the bottom of the welding flux 3 is in contact with the welding terminal 2, the top of the welding flux passes through the connecting hole 11 and extends to the circumferential direction of the connecting hole 11 to be in contact with the top of the bus bar 1, an upper welding boss 31 is formed, the welding contact area is large, and the welding effect is good; go up welding boss 31 and detain busbar 1 on weld terminal 2, prevent that not welded busbar 1 from breaking away from terminal box weld terminal 2, strengthened busbar 1 and weld terminal 2's welded connection intensity, the inspection is picked up to fine reply, need not to increase new material and structure, simple structure, the cost is lower, does benefit to and uses widely. Preferably, the thickness of the upper welding boss 31 is 0.1 to 0.2mm.

The upper welding boss 31 is formed as follows:

in the lamination and assembly stage, a connecting hole 11 shown in fig. 2 is formed in the welding position of the bus bar 1 and the welding terminal 2 of the junction box, the connecting hole 11 can be overlapped with the front of the welding flux 3 on the welding terminal 2, after the bus bar 1 is welded with the welding flux 3, the welding flux 3 is melted, is influenced by the pressing pressure of the bus bar 1, spreads to the periphery and overflows from the connecting hole 11, and an upper welding boss 31 shown in fig. 3 is formed.

The formation of the upper welding boss 31 has the following advantages:

1) The upper welding boss 31 can fasten the bus bar 1 to the welding terminal 2, and can prevent the unwelded bus bar 1 from separating from the junction box welding terminal 2, thereby forming a first condition for increasing the welding reliability.

2) When the solder 3 is melted, the solder wets the side wall of the connection hole 11 and the top of the bus bar 1, and the solder 3 forms a good soldering effect after being cooled, thereby forming a second condition for increasing the soldering reliability.

3) Through the connecting holes 11, a visual inspection can be performed on the welding effect, the condition that the solder 3 does not overflow can be directly judged as unqualified welding, the solder 3 is not melted or is unstable after welding, the reworking processes such as adding the solder 3 and heating can be performed on the connecting holes 11 in a targeted manner for repairing, and a third condition for increasing the welding reliability is formed.

In the present embodiment, the bottom of the solder 3 passes through the connection hole 11 and extends to the circumferential direction of the connection hole 11 to contact the bottom of the bus bar 1, forming the lower soldering land 32. The solder 3 having the upper and lower soldering bosses 31 and 32 forms a "rivet" shape, further increasing the soldering area of the bus bar 1 and the soldering terminal 2, and fastening the bus bar 1 to the soldering terminal 2, further improving the soldering stability.

In this embodiment, the connection hole 11 is a circular hole. Of course, in other embodiments, the connecting hole 11 may be a square hole, a semicircular hole or a hole with other shapes. When the connecting holes 11 are semicircular holes, a plurality of pairs of connecting holes 11 need to be arranged, each pair of connecting holes 11 are respectively arranged on two sides of the bus bar 1, and the welding effect is better.

In this embodiment, the solder 3 is solder.

In this embodiment, the thickness of the lower welding boss 32 is 0.2 to 0.3mm.

Although the present invention has been described with reference to the preferred embodiments, it is not intended to limit the present invention. The technical solution of the present invention can be used by anyone skilled in the art to make many possible variations and modifications, or to modify equivalent embodiments, without departing from the scope of the technical solution of the present invention, using the technical content disclosed above. Therefore, any simple modification, equivalent change and modification made to the above embodiments by the technical entity of the present invention should fall within the protection scope of the technical solution of the present invention, all without departing from the contents of the technical solution of the present invention.

Claims

1. The utility model provides a connection structure of photovoltaic terminal box and busbar which characterized in that: open on busbar (1) has connecting hole (11), be equipped with solder (3) in connecting hole (11), the lateral wall contact of solder (3) and connecting hole (11), the bottom of solder (3) and photovoltaic terminal box's solder terminal (2) contact, connecting hole (11) are passed at the top of solder (3) to the circumference extension of connecting hole (11) reaches the top contact with busbar (1), forms welding boss (31).

2. The connecting structure of a photovoltaic junction box and a bus bar according to claim 1, wherein: the bottom of the solder (3) penetrates through the connecting hole (11) and extends to the circumferential direction of the connecting hole (11) to be in contact with the bottom of the bus bar (1) to form a lower welding boss (32).

3. The connecting structure of a photovoltaic junction box and a bus bar according to claim 1, wherein: the thickness of the upper welding boss (31) is 0.1-0.2 mm.

4. The connection structure of a photovoltaic junction box and a bus bar according to any one of claims 1 to 3, wherein: the connecting hole (11) is a round hole.

5. The connection structure of a photovoltaic junction box and a bus bar according to any one of claims 1 to 3, wherein: the connecting hole (11) is a square hole.

6. The connection structure of a photovoltaic junction box and a bus bar according to any one of claims 1 to 3, wherein: the connecting holes (11) are provided with a plurality of pairs, and each pair of connecting holes (11) are respectively arranged on two sides of the bus bar (1).

7. The connecting structure of a photovoltaic junction box and a bus bar according to claim 6, wherein: the connecting hole (11) is a semicircular hole.

8. The connection structure of a photovoltaic junction box and a bus bar according to any one of claims 1 to 3, wherein: the solder (3) is soldering tin.

9. The connecting structure of the photovoltaic junction box and the bus bar according to claim 2, wherein: the thickness of the lower welding lug boss (32) is 0.2-0.3 mm.