阅读说明：本技术 一种光伏接线盒的电气连接结构、接线盒及连接方法 (Electrical connection structure of photovoltaic junction box, junction box and connection method ) 是由 杨摇 袁昭岚 谢建国 范蛟 刘帅 于 2019-11-25 设计创作，主要内容包括：本发明公开了一种光伏接线盒的电气连接结构及光伏接线盒,用于与光伏组件的汇流条进行电气连接,包括上接线柱和下接线柱；所述下接线柱的上表面设有用于搁置焊锡的上焊接区,所述下接线柱的下表面设置有用于搁置焊锡的下焊接区；所述上焊接区与下焊接区相对应设置且汇流条位于所述上焊接区与下焊接区之间；所述上接线柱与所述下接线柱之间设置有滑动夹紧组件,用于限制所述上接线柱相对于下接线柱在第一位置与第二位置之间滑动,并且使上接线柱沿第一位置向第二位置滑动时,上接线柱的下表面逐渐靠近下接线柱的上表面而夹紧汇流条。本发明具有连接可靠性高、成本低、操作简便等优点。(The invention discloses an electrical connection structure of a photovoltaic junction box and the photovoltaic junction box, which are used for being electrically connected with a bus bar of a photovoltaic assembly and comprise an upper wiring column and a lower wiring column; the upper surface of the lower wiring column is provided with an upper welding area for placing soldering tin, and the lower surface of the lower wiring column is provided with a lower welding area for placing the soldering tin; the upper welding area and the lower welding area are arranged correspondingly, and the bus bar is positioned between the upper welding area and the lower welding area; go up the terminal with be provided with slip clamping component between the terminal is followed to the terminal for lower terminal slides between primary importance and second place to when making the upper terminal slide to the second place along primary importance, the lower surface of going up the terminal is close to the upper surface of terminal and presss from both sides tight busbar down gradually. The invention has the advantages of high connection reliability, low cost, simple and convenient operation and the like.)

1. An electrical connection structure of a photovoltaic junction box is used for electrically connecting with a bus bar (3) of a photovoltaic module, and is characterized by comprising an upper wiring column (1) and a lower wiring column (2); the upper surface of the lower wiring column (2) is provided with an upper welding area (101) for placing soldering tin (5), and the lower surface of the lower wiring column (2) is provided with a lower welding area (201) for placing the soldering tin (5); the upper welding area (101) and the lower welding area (201) are arranged correspondingly, and the bus bar (3) is positioned between the upper welding area (101) and the lower welding area (201); go up terminal (1) with be provided with slip clamping component (4) between terminal (2) down for the restriction go up terminal (1) and slide between primary importance and second place for terminal (2) down to when making last terminal (1) slide to the second place along the primary importance, the lower surface of going up terminal (1) is close to the upper surface of terminal (2) down gradually and presss from both sides tight busbar (3).

2. The electrical connection structure of a photovoltaic junction box according to claim 1, characterized by comprising a sliding clamping assembly (4) comprising a sliding groove structure (401) and a track groove structure (402), wherein the sliding groove structure (401) is located between one end of the upper terminal (1) and one end of the lower terminal (2), and the track groove structure (402) is located between the other end of the upper terminal (1) and the other end of the lower terminal (2).

3. The electrical connection structure of the photovoltaic junction box as claimed in claim 2, wherein the sliding groove structure (401) comprises a sliding groove (4011) and a positioning column (4012), the sliding groove (4011) is located on two sides of one end of the lower wiring column (2), and the positioning column (4012) is located on two sides of one end of the upper wiring column (1) and is slidably arranged in the sliding groove (4011); or spout (4011) are located go up the both sides of terminal (1) one end, reference column (4012) are located the both sides of lower terminal (2) one end just locate with sliding in spout (4011).

4. The electrical connection structure of the photovoltaic junction box, as set forth in claim 3, characterized in that the track groove structure (402) comprises track grooves (4021) and guide posts (4022), the track grooves (4021) are located on two sides of the other end of the upper binding post (1) and extend from top to bottom along the direction of the first position to the second position, and the guide posts (4022) are located on two sides of the other end of the lower binding post (2) and are slidably disposed in the track grooves (4021); or the track groove (4021) is located the two sides of the other end of the lower wiring column (2), and extends from top to bottom along the direction of the first position to the second position, and the guide columns (4022) are located the two sides of the other end of the upper wiring column (1) and are slidably arranged in the track groove (4021).

5. The electrical connection structure of a photovoltaic junction box according to any one of claims 1 to 4, wherein the upper land (101) of the upper stud (1) and the lower land (201) of the lower stud (2) are each provided with solder (5).

6. The electrical connection structure of a photovoltaic junction box according to claim 5, wherein a melting point of the solder (5) on the lower land (201) is lower than a melting point of the solder (5) on the upper land (101).

7. A photovoltaic junction box comprises a box body, and is characterized in that the electrical connection structure of the photovoltaic junction box is arranged in the box body according to claims 1-6.

8. A connecting method of an electrical connection structure based on the photovoltaic junction box according to any one of claims 1 to 6, for realizing electrical connection between the electrical connection structure and a bus bar (3), characterized by comprising the steps of:

s01, arranging soldering tin (5) on the upper welding area (101) of the upper binding post (1) and the lower welding area (201) of the lower binding post (2);

s02, placing a bus bar (3) between an upper welding area (101) of the upper binding post (1) and a lower welding area (201) of the lower binding post (2), wherein the upper binding post (1) is located at a first position;

s03, heating the upper surface of the upper binding post (1) relative to the upper welding area (101) to melt the soldering tin (5) on the upper welding area (101) and the lower welding area (201);

s04, the upper wiring column (1) is pushed to slide relative to the lower wiring column (2) from the first position to the second position, and therefore the upper wiring column (1) and the lower wiring column (2) clamp the bus bar (3).

9. The connecting method according to claim 8, wherein in step S04, when the upper terminal stud (1) cannot slide to the second position, it is judged that the solder (5) is not completely melted and there is a cold solder or a false solder.

10. The connecting method according to claim 8 or 9, characterized in that in step S01, the melting point of the solder (5) on the lower land (201) is lower than the melting point of the solder (5) on the upper land (101), and the solder (5) on the upper land (101) and the lower land (201) are melted simultaneously when heating is performed.

Technical Field

The invention mainly relates to the technical field of photovoltaic, in particular to an electrical connection structure, a junction box and a connection method of a photovoltaic junction box.

Background

At present, a pure compression joint method and a pure welding method are adopted for electrical connection between the output bus bar of the laminated part of the photovoltaic module and the output junction box, and the pure compression joint method requires that the strength design of a junction box wiring terminal meets certain requirements, so that the photovoltaic module is large in metal consumption, high in production cost and gradually eliminated. As shown in fig. 1, a terminal 6 of the output junction box is covered with solder 5 (or called solder alloy), and during operation, an operator heats the terminal from above the bus bar 3 to a certain extent, the solder 5 melts, and the terminal 6 and the bus bar 3 are connected into a whole by infiltration. However, the above method has the following disadvantages:

(1) because the operation space between the junction box and the bus bar 3 is small, the heating surface is only limited right above the bus bar 3, and the false soldering/false soldering can be caused by insufficient heating and incomplete heating of the soldering tin 5 for soldering;

(2) due to the short operation time, the soldering tin alloy for welding is possibly insufficient in heating, insufficient in melting degree and fluidity, incapable of forming effective infiltration on the bus bar 3, and insufficient in bonding strength with the bus bar 3, so that insufficient welding/false welding exists;

(3) the bus bar 3 has certain elasticity, and when the soldering tin alloy is heated and melted, certain pressure needs to be applied to the bus bar 3 to ensure that the bus bar 3, the soldering tin alloy and the binding post 6 can reach a proper distance, so that the bus bar 3, the soldering tin alloy and the binding post 6 can be completely contacted; if the operation does not apply pressure or the pressure application time is insufficient, the three parts can be insufficiently separated, welding can not be carried out or false welding with too small contact area can be formed;

(4) after the soldering tin alloy is melted and the condensation welding is finished, generally, an action of picking up the bus bar 3 upwards is needed to confirm whether the welding is in place; however, such an operation is performed during the soldering tin condensation process but not at the time of complete condensation, which may cause stress gaps to be formed during the soldering tin alloy condensation process, and such gaps may become larger and larger during the use of the photovoltaic module, thereby causing soldering failure.

Related patent documents are searched for:

1) high strength photovoltaic terminal box anticreep terminal, application number 201711402695.6

And (3) abstract: the invention discloses a high-strength photovoltaic junction box anti-drop terminal which comprises a junction box body, wherein a first wire passing pipe is uniformly connected to the left side of the junction box body, a second wire passing pipe is uniformly connected to the right side of the junction box body, positioning plates are arranged at the top and the bottom of the junction box body, a cover plate is arranged on the junction box body, a base plate is arranged inside the junction box body, a wire groove is formed in the base plate, a pressing plate is arranged on the base plate, sawtooth-shaped first anti-slip bulges are uniformly arranged on the upper surface of the base plate, and sawtooth-shaped second anti-slip bulges are uniformly arranged on the lower surface of the pressing plate. Change traditional terminal box binding post structure, utilize first non-slip raised and second non-slip raised firmly to fix the tip of electric wire to still can normally work under the pulling force of high strength, effectively avoid the pine to take off, conveniently with terminal box body fixed mounting, have very high practicality, be fit for extensively promoting. The method is not suitable for connecting the photovoltaic assembly laminating part and the output junction box, the output of the photovoltaic assembly laminating part adopts the hard flat bus bar, good contact can not be effectively ensured by only using the protective protrusion, and the structure is complex and the operation is time-consuming.

2) Reliable welded structure of photovoltaic terminal box terminal, application number 201620300829.8

And (3) abstract: the utility model discloses a reliable welded structure of photovoltaic terminal box terminal, including a main part plane, a face of weld and a flatiron rest the face, main part plane, face of weld, flatiron rest the face and connect gradually into "Contraband" shape. Some reserved tin can be placed on the welding surface or not. When the welding head of the soldering iron is placed on the welding surface for welding operation, most of the soldering iron can only be contacted with the placing surface of the soldering iron but can not be contacted with the main body plane of the terminal, and the main body plane with a longer heat conduction distance basically has no heat, so that the damage of the high-temperature soldering iron to the main body plane of the terminal and elements mounted on the main body plane of the terminal during welding is avoided. The defects of pure welding are not effectively overcome, and the problem still exists only by changing the welding direction of the bus bar from horizontal to vertical.

3) Novel joint formula photovoltaic terminal box, application number 201610773264.X

And (3) abstract: the invention relates to a novel clamping type photovoltaic junction box, which comprises a box body, a metal piece and a pressing block, wherein the box body comprises a box frame, a box bottom, a box cover and a sealing ring, a plurality of first clamping blocks, a positive wiring outlet and a negative wiring outlet are arranged at the edge of the box frame, a first sealing groove, a positive wiring channel and a negative wiring channel are arranged on the box frame, a first clamping group and a second clamping group are arranged on the inner wall of the box frame, the first clamping group comprises two second clamping blocks, a first clamping groove and a second clamping groove, a plurality of terminal mounting grooves and inserting plates are arranged on the box bottom, a plurality of second buckling blocks are arranged on the side wall of the box cover, a plurality of conductive bars are arranged on the metal piece, a plurality of terminals, mounting holes and fuses are arranged on the conductive bars, and wiring holes are arranged in the pressing block. Is suitable for large-scale production. The above described design of the junction box component as a snap-fit installation is beneficial to the production of the output junction box component, but there is no effective improvement in the electrical connection between the photovoltaic assembly laminate and the output junction box.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: aiming at the technical problems in the prior art, the invention provides an electrical connection structure, a junction box and a connection method of a photovoltaic junction box, wherein the photovoltaic junction box is reliable in connection.

In order to solve the technical problems, the technical scheme provided by the invention is as follows:

an electrical connection structure of a photovoltaic junction box is used for being electrically connected with a bus bar of a photovoltaic assembly and comprises an upper wiring column and a lower wiring column; the upper surface of the lower wiring column is provided with an upper welding area for placing soldering tin, and the lower surface of the lower wiring column is provided with a lower welding area for placing the soldering tin; the upper welding area and the lower welding area are arranged correspondingly, and the bus bar is positioned between the upper welding area and the lower welding area; go up the terminal with be provided with slip clamping component between the terminal is followed to the terminal for lower terminal slides between primary importance and second place to when making the upper terminal slide to the second place along primary importance, the lower surface of going up the terminal is close to the upper surface of terminal and presss from both sides tight busbar down gradually.

As a further improvement of the above technical solution:

including sliding clamping assembly including spout structure and orbit groove structure, the spout structure is located go up the terminal one end with between the one end of binding post down, orbit groove structure is located go up the terminal the other end with between the other end of binding post down.

The sliding groove structure comprises a sliding groove and positioning columns, the sliding groove is positioned on two sides of one end of the lower wiring column, and the positioning columns are positioned on two sides of one end of the upper wiring column and are arranged in the sliding groove in a sliding mode; or the sliding grooves are positioned on two sides of one end of the upper wiring terminal, and the positioning columns are positioned on two sides of one end of the lower wiring terminal and are slidably arranged in the sliding grooves.

The track groove structure comprises track grooves and guide posts, the track grooves are located on two sides of the other end of the upper wiring terminal and extend from top to bottom along the direction from the first position to the second position, and the guide posts are located on two sides of the other end of the lower wiring terminal and are slidably arranged in the track grooves; or the track trench is located the both sides of the lower binding post other end, and follow first position and extend from last to arranging to the second position direction, the guide post is located the both sides of the upper binding post other end and locate smoothly the track inslot.

And the upper welding area of the upper binding post and the lower welding area of the lower binding post are both provided with soldering tin.

The melting point of the solder on the lower welding area is lower than the melting point of the solder on the upper welding area.

The invention also discloses a photovoltaic junction box, which comprises a box body, wherein the electrical connection structure of the photovoltaic junction box is arranged in the box body.

The invention further discloses a connecting method of the electrical connecting structure based on the photovoltaic junction box, which is used for realizing the electrical connection between the electrical connecting structure and the bus bar and comprises the following steps:

s01, solder is arranged on the upper welding area of the upper binding post and the lower welding area of the lower binding post;

s02, placing a bus bar between an upper welding area of the upper binding post and a lower welding area of the lower binding post, wherein the upper binding post is located at a first position;

s03, heating the upper surface of the upper binding post relative to the upper welding area to melt the soldering tin on the upper welding area and the lower welding area;

and S04, pushing the upper wiring column to slide relative to the lower wiring column from the first position to the second position, so that the upper wiring column and the lower wiring column clamp the bus bar.

As a further improvement of the above technical solution:

in step S04, when the upper stud cannot slide to the second position, it is determined that the solder is not completely melted and a cold solder or a false solder exists.

In step S01, the melting point of the solder on the lower land is lower than the melting point of the solder on the upper land, and the solder on the upper land and the solder on the lower land are melted simultaneously when heating is performed.

Compared with the prior art, the invention has the advantages that:

(1) the electrical connection structure of the photovoltaic junction box disclosed by the invention has the advantages that the upper wiring column, the bus bar and the lower wiring column are connected by soldering tin by heating the soldering tin on the upper welding area and the lower welding area; meanwhile, the bus bar is clamped by the upper wiring terminal and the lower wiring terminal under the action of the sliding clamping assembly, so that the physical fastening connection among the upper wiring terminal, the bus bar and the lower wiring terminal is realized; through the matching between the soldering tin connection and the physical fastening connection, the photovoltaic junction box is reliably and stably connected with the bus bar; certainly, when moving from the first position to the second position, because last terminal and lower terminal are close to gradually, also can extrude soldering tin to make soldering tin and busbar in close contact with, avoid appearing stress gap, further improve the reliability of connecting.

(2) The upper welding area of the invention is close to the heat source, common soldering alloy is selected, the lower welding area of the lower wiring column is far away from the heat source, low-temperature working soldering alloy is selected, and the melting point of the soldering alloy of the lower welding area is lower than that of the soldering of the upper welding area, so that the soldering of the upper welding area and the lower welding area can be synchronously melted during welding, the bus bar can be better infiltrated, and the connection reliability is further improved.

(3) According to the connecting method, the tin soldering fixing and the physical fixing are doubly fixed, and the two fixing modes are mutually integrated, so that the whole connecting structure is reliably connected; the operation method only needs the operator to perform branding heating and push the upper binding post, and does not need actions such as tin adding, pressurization, picking detection and the like, so that the operation method is simple and practical.

(4) According to the invention, the phenomenon of insufficient melting of the soldering tin, insufficient soldering or false soldering and the like is judged when the upper wiring terminal cannot slide to the second position; the operation method is simple, convenient and quick, and the judgment is accurate compared with the mode of human eye observation.

(5) According to the electrical connection structure with the structure, the convenient and reliable connection test between the connection structure and the bus bar can be realized, namely when the junction box is required to be tested, the junction box is connected with the bus bar through the sliding clamping assembly without heating or arranging soldering tin, and after the test is finished, the bus bar and the junction box can be separated by moving the upper wiring terminal, so that the operation is convenient and fast.

(6) The invention adopts the connection of the solder fixation as the main connection and the physical fixation as the auxiliary connection, thereby ensuring the reliability of the connection and having low overall cost; meanwhile, the sliding clamping mode is simple and convenient to operate, judgment of cold joint or false joint can be achieved, and the phenomenon of cold joint or false joint is avoided; in addition, after the connection in the mode, the picking and pulling inspection is not needed, and the cold joint phenomenon caused by the inspection is reduced.

Drawings

Fig. 1 is a schematic diagram of a connection structure in the prior art.

FIG. 2 is a schematic structural diagram of an embodiment of the present invention.

FIG. 3 is a second schematic structural diagram of the present invention.

Fig. 4 is a third schematic structural diagram of the present invention.

Fig. 5 is a top view structural diagram of the lower terminal stud of the present invention in an embodiment.

Fig. 6 is a front view of the lower terminal according to the embodiment of the present invention.

Fig. 7 is a bottom view of the upper terminal block of the present invention in an embodiment.

Fig. 8 is a front view structural view of an embodiment of an upper terminal of the present invention.

Illustration of the drawings: 1. an upper binding post; 101. an upper welding area; 2. connecting a wiring column downwards; 201. a lower weld zone; 3. a bus bar; 4. a sliding clamping assembly; 401. a chute structure; 4011. a chute; 4012. a positioning column; 402. a track groove structure; 4021. a track groove; 4022. a guide post; 5. soldering tin; 6. and (4) binding posts.

Detailed Description

The invention is further described below with reference to the figures and the specific embodiments of the description.

As shown in fig. 2 to 8, the electrical connection structure of the photovoltaic junction box of the present embodiment is used for electrically connecting with a bus bar 3 of a photovoltaic module, and includes an upper terminal 1 and a lower terminal 2; the upper surface of the lower wiring column 2 is provided with an upper welding area 101, soldering tin 5 is placed on the upper welding area 101, the lower surface of the lower wiring column 2 is provided with a lower welding area 201, and the soldering tin 5 is placed on the lower welding area 201; the upper welding area 101 and the lower welding area 201 are arranged correspondingly, and the bus bar 3 is positioned between the upper welding area 101 and the lower welding area 201 for welding; a sliding clamping assembly 4 is arranged between the upper binding post 1 and the lower binding post 2, and is used for enabling the upper binding post 1 to slide between a first position and a second position relative to the lower binding post 2, and when the upper binding post 1 slides to the second position along the first position, the lower surface of the upper binding post 1 gradually approaches to the upper surface of the lower binding post 2 to clamp the bus bar 3.

The electrical connection structure of the photovoltaic junction box of the invention heats the soldering tin 5 on the upper welding area 101 and the lower welding area 201 to connect the soldering tin 5 among the upper wiring column 1, the bus bar 3 and the lower wiring column 2; meanwhile, the bus bar 3 is clamped by the upper wiring terminal 1 and the lower wiring column 2 under the action of the sliding clamping component 4, so that the physical fastening connection among the upper wiring terminal 1, the bus bar 3 and the lower wiring column 2 is realized; through the matching between the soldering tin 5 connection and the physical fastening connection, the reliable and stable connection between the photovoltaic junction box and the bus bar 3 is realized; of course, when moving from the first position to the second position, the upper terminal 1 and the lower terminal 2 are gradually close to each other, and the melted solder 5 can be pressed, so that the solder 5 is in close contact with the bus bar 3, a stress gap is avoided, and the reliability of connection is further improved.

In this embodiment, the sliding clamping assembly 4 includes a sliding groove structure 401 and a track groove structure 402, the sliding groove structure 401 is located between one end of the upper binding post 1 and one end of the lower binding post 2, and the track groove structure 402 is located between the other end of the upper binding post 1 and the other end of the lower binding post 2. Specifically, the sliding groove structure 401 includes a sliding groove 4011 and positioning pillars 4012, the sliding groove 4011 is located on two sides of one end of the lower wiring column 2, and the positioning pillars 4012 are located on two sides of one end of the upper wiring column 1 and are slidably disposed in the sliding groove 4011; track groove structure 402 includes track groove 4021 and guide post 4022, and track groove 4021 is located the both sides of the upper binding post 1 other end, and extends to arrange from last to down along first position to second position direction, and guide post 4022 is located the both sides and the cunning of the lower binding post 2 other end and locates in track groove 4021. As shown in fig. 2, when the bus bar 3 is connected, the other end between the upper post 1 and the lower post 2 is opened, and then the bus bar 3 is placed between the upper post 1 and the lower post 2, as shown in fig. 3, when the upper post 1 is located at the first position; then, after the soldering tin 5 is heated and melted, the upper binding post 1 is slid rightwards, so that the guide post 4022 slides in the track groove 4021, and due to the matching effect of the track groove 4021 and the guide post 4022, the upper binding post 1 gradually approaches the lower binding post 2 to clamp the bus bar 3, as shown in fig. 4, finally, the upper binding post 1 is located at the second position. In other embodiments, the sliding slots 4011 may also be located on two sides of one end of the upper terminal 1, and the positioning posts 4012 are located on two sides of one end of the lower terminal 2 and slidably disposed in the sliding slots 4011; and the track groove 4021 is located at two sides of the other end of the lower binding post 2 and extends from top to bottom along the first position to the second position, and the guide posts 4022 are located at two sides of the other end of the upper binding post 1 and are slidably arranged in the track groove 4021. Of course, the upper binding post 1 and the lower binding post 2 are all integrated into one integral structure; the structure is simple, the operation is simple and convenient, and the realization is easy.

In this embodiment, the melting point of the solder 5 on the lower land 201 is lower than the melting point of the solder 5 on the upper land 101. Because the upper welding area 101 of the upper binding post 1 is close to the heat source and is made of common soldering tin alloy, and the lower welding area 201 of the lower binding post 2 is far away from the heat source, the soldering tin alloy with low-temperature working is selected, and preferably, the melting point of the soldering tin alloy of the lower welding area 201 is about 50 ℃ lower than that of the soldering tin of the upper welding area 101, the soldering tin 5 of the upper welding area 101 and the soldering tin 5 of the lower welding area 201 can be synchronously melted during welding, the bus bar 3 can be better soaked, and the connection reliability is further improved.

The invention also correspondingly discloses a photovoltaic junction box which comprises a box body, wherein the box body is internally provided with the electrical connection structure of the photovoltaic junction box. The photovoltaic junction box has the electrical connection structure and also has the advantages of the electrical connection structure.

The invention also correspondingly discloses a connecting method of the electrical connecting structure based on the photovoltaic junction box, which is used for realizing the electrical connection between the electrical connecting structure and the bus bar 3 and comprises the following steps:

s01, arranging soldering tin 5 on the upper welding area 101 of the upper binding post 1 and the lower welding area 201 of the lower binding post 2;

s02, placing the bus bar 3 between the upper bonding area 101 of the upper bonding post 1 and the lower bonding area 201 of the lower bonding post 2, with the upper bonding post 1 being at the first position;

s03, heating the upper surface of the upper terminal 1 relative to the upper welding area 101 to melt the solder 5 on the upper welding area 101 and the lower welding area 201;

s04, the upper post 1 is pushed to slide relative to the lower post 2 from the first position to the second position, so that the upper post 1 and the lower post 2 clamp the bus bar 3.

According to the connecting method, the tin soldering fixing and the physical fixing are doubly fixed, and the two fixing modes are mutually integrated, so that the whole connecting structure is reliably connected; the operation method only needs the operation personnel to heat the soldering iron and push the upper wiring terminal 1, does not need actions such as tin adding, pressurization, picking detection and the like, and is simple and practical to operate.

In this embodiment, in step S04, when the upper terminal 1 cannot slide to the second position, it is determined that the solder 5 is not completely melted, and a cold solder or a false solder exists; the operation method is simple, convenient and quick, and the judgment is accurate compared with a human eye observation mode.

In this embodiment, in step S01, the melting point of the solder 5 on the lower bonding area 201 is lower than the melting point of the solder 5 on the upper bonding area 101, so that the two solder 5 can be melted simultaneously, thereby further improving the connection reliability; if the two parts are both welded by conventional common tin soldering, the temperature of a heat source needs to be adjusted higher during welding, and other parts are easily damaged by a high heat source; or other parts can be damaged by long-time heating, and the work efficiency is low due to the delayed heating time.

Of course, with the electrical connection structure having the above structure, a convenient reliable connection test between the connection structure and the bus bar 3 can be realized, that is, when a terminal box test is required, the connection between the terminal box and the bus bar 3 is realized by the sliding clamping assembly 4 without heating the soldering tin 5 or providing the soldering tin 5. After the test is finished, the bus bar 3 and the junction box can be separated by moving the upper wiring terminal 1, and the operation is convenient and fast.

The invention adopts the connection of the solder fixation as the main connection and the physical fixation as the auxiliary connection, thereby ensuring the reliability of the connection and having low overall cost; meanwhile, the sliding clamping mode is simple and convenient to operate, judgment of cold joint or false joint can be achieved, and the phenomenon of cold joint or false joint is avoided; in addition, after the connection in the mode, the picking and pulling inspection is not needed, and the cold joint phenomenon caused by the inspection is reduced.

The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above-mentioned embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may be made by those skilled in the art without departing from the principle of the invention.