Axial diode junction box

Abstract

The utility model relates to an axial diode junction box, which comprises a box body, a cover plate, an axial diode and a terminal piece, the box body is strip-shaped, the cover plate is detachably fixed at the top of the box body, the terminal piece is fixed in the box body, the axial diode is arranged along the width direction of the box body, and the axial diode is arranged along the width direction of the box body. The number of the terminal pieces is two, the terminal pieces are arranged at intervals in the length direction of the box body, stamping grooves are formed in the upper surfaces of the terminal pieces through stamping, protruding parts are formed on the lower surfaces of the terminal pieces at the same time, and the packaging part of the axial diode is located between the two terminal pieces. And the two pins of the axial diode are respectively fixed on the lug bosses of the terminal sheet from the lower part through electric resistance welding. The axial diode junction box is small in size, compact in structure, convenient to assemble and excellent in heat dissipation effect.

Description

Technical Field

[0001] The utility model relates to an axial diode junction box, belonging to the technical field of photovoltaics. Background Art

[0002] A solar junction box is a connector between the solar cell array and the solar charging control unit, providing users with a comprehensive solar panel connection solution. A double-glass solar cell module consists of two layers of glass, front and back, with a solar cell nestled between them. Individual solar cells cannot be used directly as a power source. To do so, they must be connected in series or parallel and tightly packaged into modules. Solar cell modules (also called solar panels) are the core and most important component of a solar power generation system. The function of a solar cell module is to convert solar energy into electricity, either for storage in batteries or to power a load.

[0003] Chinese patent document CN217933779U discloses an axial diode, a junction box, and a photovoltaic module. The axial diode is disposed within the junction box of the photovoltaic module. The junction box has a long side and a short side, and includes a diode body. The angle between the axial direction of the diode body and the long side of the junction box is acute or obtuse. The diode body also includes a first bent pin and a second bent pin, each connected to opposite sides of the diode body. The connection between the diode and the terminal block in this patent is unstable, and the heat dissipation effect is poor. Summary of the Invention

[0004] The technical problem to be solved by the utility model is to provide an axial diode junction box which has small volume, compact structure, convenient assembly and excellent heat dissipation effect.

[0005] The utility model proposes a technical solution to solve the above technical problems: an axial diode junction box, comprising a box body, a cover plate, an axial diode and a terminal piece, the box body is in the shape of an elongated strip, the cover plate is detachably fixed to the top of the box body, the terminal piece is fixed in the box body, the axial diode is arranged along the width direction of the box body, the terminal piece has two pieces and is spaced apart along the length direction of the box body, the terminal piece is formed by stamping a stamping groove on the upper surface of the terminal piece and a raised portion is formed on the lower surface of the terminal piece at the same time, the packaging portion of the axial diode is located between the two terminal pieces, and the two pins of the axial diode are respectively fixed to the raised portion of the terminal piece from the bottom by resistance welding.

[0006] The axial diode junction box also includes two heat sinks spaced apart along the length of the box body. The heat sinks are located below the terminal pieces and affixed to the bottom of the corresponding terminal pieces. Both the terminal pieces and the heat sinks are L-shaped. The heat sinks are provided with stamping grooves that match the shapes of the two pins of the axial diode. The two pins of the axial diode are respectively located in the corresponding stamping grooves, and the stamping grooves are affixed to the pins of the axial diode.

[0007] The raised portion is provided with an arc-shaped groove with an opening facing downward and matching the shape of the pin of the axial diode. The two pins of the axial diode are respectively welded and fixed in the corresponding arc-shaped groove.

[0008] A vertical downward folding portion is provided at the edge of each terminal piece, and a notch is provided on the folding portion that opens downward and matches the pin position of the axial diode, and the notch is larger at the bottom and smaller at the top; the stamping groove and the raised portion are both waist-shaped; a tin block is provided above the terminal piece.

[0009] The bottom of the box body is provided with a limit column arranged in the vertical direction, the terminal piece is provided with a terminal piece limit opening that matches the shape of the limit column, and the heat sink is provided with a heat sink limit opening that matches the shape of the limit column, and the terminal piece limit opening is arranged concentrically with the heat sink limit opening; the limit column includes a boss portion and a column portion arranged from bottom to top, the top of the boss portion is abutted against the bottom of the heat sink, and the limit column passes through the corresponding heat sink limit opening and terminal piece limit opening in sequence through its column portion, and fixes the heat sink and terminal piece in the box body by its own hot melting or cold pressing.

[0010] The bottom of the box body is provided with a limit column arranged in the vertical direction, the terminal piece is provided with a terminal piece limit opening that matches the shape of the limit column, and the heat sink is provided with a heat sink limit opening that matches the shape of the limit column. The terminal piece limit opening and the heat sink limit opening are arranged concentrically and are riveted together by rivets; the limit column includes a boss portion and a column portion arranged from bottom to top, the top of the boss portion is against the bottom of the heat sink, and the limit column passes through the rivet through the column portion in sequence to fix the heat sink and the terminal piece in the box body by its own hot melting or cold pressing.

[0011] The bottom of the box body is provided with two limiting bosses arranged along the width direction of the box body, and two bus bar grooves penetrating the box body are provided on the inner sides of the two limiting bosses, and two clamping strips arranged along the width direction of the box body are provided on the inner sides of the two bus bar grooves, and an arc-shaped portion connected to the box body is provided between the two clamping strips, and a heat sink matching the shape of the packaging portion of the axial diode is provided between the two clamping strips. The heat sink is arc-shaped, and the bottom of the heat sink is attached to the arc-shaped portion, and the top of the heat sink is attached to the packaging portion of the axial diode; the bottom of the heat sink rests on the limiting bosses; the heat sink block and the heat sink are aluminum sheets, and the terminal sheet is a copper sheet.

[0012] The inner wall of the box body is provided with a reinforcement, the inner wall of the box body is provided with a snap buckle, the edge of the cover plate is provided with a snap notch that engages with the snap buckle, the cover plate is snap-fitted and fixed in the top opening of the box body, and the bottom of the cover plate is against the top of the reinforcement.

[0013] The axial diode junction box also includes a wire clip and a cable. A crimping interface is provided at one end of the box body, and a crimping portion corresponding to the position of the crimping interface is provided on the terminal piece near the crimping interface. One end of the cable is crimped and fixed in the crimping portion, and the other end of the cable extends out of the box body through the wire clip slot on the box body. The wire clip is fixed in the wire clip slot by ultrasonic welding to limit the cable.

[0014] An extension portion arranged in a horizontal direction is provided at the end of the heat sink away from the axial diode, and vertically downward folded edges are provided on both sides of the extension portion.

[0015] The utility model has positive effects:

[0016] (1) The axial diode junction box of the present invention has both a stamped groove and a raised portion punched out on the terminal piece, so that the pins of the axial diode can be fixedly connected to the raised portion by resistance welding. The raised portion is provided with an arc-shaped groove that matches the shape of the pin, which can increase the contact area between the pin and the raised portion, facilitating resistance welding. The welding and fixing of the axial diode in the axial diode junction box of the present invention is different from the conventional soldering and laser welding. Based on the characteristics of resistance welding, a special structure is adopted. The axial diode is arranged horizontally, the junction box is short in length, small in size, compact in structure, and easy to assemble, which is conducive to improving the efficiency of photovoltaic module operation.

[0017] (2) The axial diode junction box of the present invention adds a heat sink and a heat sink block below the terminal piece. The heat sink fits with the terminal piece over a large area, the heat sink fits with the pin of the axial diode, and the heat sink block fits with the packaging part of the axial diode, thereby significantly improving the heat dissipation effect.

[0018] (3) The axial diode junction box of the present invention can limit the terminal piece and the heat sink when installing them by matching the diameter of the column part of the limiting column with the size of the terminal piece limiting opening and the heat sink limiting opening, or the terminal piece and the heat sink can be riveted and fixed by a rivet, and then the column part of the limiting column is matched with the rivet to limit the terminal piece and the heat sink, making the assembly of the axial diode junction box more convenient and suitable for large-scale automated assembly line production. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The following is a further description of an axial diode junction box of the present invention with reference to the accompanying drawings.

[0020] Figure 1 This is a schematic diagram of the three-dimensional structure of the axial diode junction box of Example 1;

[0021] Figure 2 for Figure 1 A schematic diagram of the three-dimensional structure of the axial diode junction box without the cover;

[0022] Figure 3 for Figure 1 Schematic diagram of the three-dimensional exploded structure of the axial diode, terminal piece, and heat sink;

[0023] Figure 4 for Figure 1 Schematic diagram of the three-dimensional structure of the box body;

[0024] Figure 5 for Figure 1 A schematic diagram of the three-dimensional structure of the box body, heat dissipation block and heat sink;

[0025] Figure 6 This is a schematic diagram of the three-dimensional structure of the axial diode junction box of Example 2;

[0026] Figure 7 for Figure 6 Schematic diagram of the three-dimensional structure of the axial diode junction box without the cover.

[0027] The above-mentioned reference numerals are as follows:

[0028] Box body 1, bus bar groove 11, limiting boss 12, clamping strip 13, reinforcement 14, pressing interface 15, buckle 17, limiting column 18, column part 181, boss part 182, arc part 19,

[0029] Cover plate 2, bayonet 21,

[0030] Axial diode 3,

[0031] Terminal piece 4, terminal piece punching groove 41, protrusion 42, notch 43, folding part 44, terminal piece limiting opening 45, crimping part 46,

[0032] Heat sink 5, heat sink stamping groove 51, heat sink limit opening 52, extension part 53,

[0033] Riveted parts 6, line card 7, heat sink 8, tin block 9. DETAILED DESCRIPTION Example 1

[0034] See Figures 1 to 5 The axial diode junction box of this embodiment includes a box body 1, a cover plate 2, an axial diode 3 and a terminal piece 4. The box body 1 is long and strip-shaped, the cover plate 2 is detachably fixed to the top of the box body 1, the terminal piece 4 is fixed in the box body 1, the axial diode 3 is arranged along the width direction of the box body 1, and there are two terminal pieces 4 that are spaced apart along the length direction of the box body. The terminal piece 4 is formed by stamping a terminal piece stamping groove 41 on the upper surface of the terminal piece 4 and a protrusion 42 is formed on the lower surface of the terminal piece 4 at the same time. The packaging portion of the axial diode 2 is located between the two terminal pieces 4, and the two pins of the axial diode 3 are respectively fixed to the protrusion 42 of the terminal piece 4 from the bottom by resistance welding.

[0035] The axial diode junction box of this embodiment also includes two heat sinks 5 spaced apart along the length direction of the box body 1. The heat sinks 5 are located below the terminal pieces 4 and fit on the bottom of the corresponding terminal pieces 4. Both the terminal pieces 4 and the heat sinks 5 are L-shaped. The heat sink 5 is provided with heat sink stamping grooves 51 that match the shapes of the two pins of the axial diode 3. The two pins of the axial diode 3 are respectively located in the corresponding heat sink stamping grooves 51, and the heat sink stamping grooves 51 fit on the pins of the axial diode 3.

[0036] The raised portion 42 has a downward-facing arcuate slot that matches the shape of the pins of the axial diode 3. The two pins of the axial diode 3 are soldered into their corresponding arcuate slots. Each terminal piece 4 has a vertically downward-facing fold 44 at its edge. This fold 44 has a downward-facing notch 43 that matches the position of the pins of the axial diode 3. The notch 43 is larger at the bottom and smaller at the top. The terminal piece's stamped slot 41 and raised portion 42 are both oval-shaped. A tin block 9 is located above the terminal piece 4.

[0037] The bottom of the box body 1 is provided with a vertically arranged limiting post 18. The terminal piece 4 is provided with a terminal piece limiting opening 45 that matches the shape of the limiting post 18. The heat sink 5 is provided with a heat sink limiting opening 52 that matches the shape of the limiting post 18. The terminal piece limiting opening 45 and the heat sink limiting opening 52 are arranged concentrically and are riveted together by a rivet 6. The limiting post 18 includes a boss portion 182 and a column portion 181 arranged from bottom to top. The top of the boss portion 182 abuts against the bottom of the heat sink 5. The limiting post 18 passes through the rivet 6 through its column portion 181, and fixes the heat sink 5 and the terminal piece 4 in the box body 1 by itself through hot melting or cold pressing.

[0038] The bottom of the box body 1 is provided with two limiting bosses 16 arranged along the width of the box body 1. Two busbar slots 11 are provided inside the two limiting bosses 16 and extend through the box body 1. Two clips 13 are provided inside the two busbar slots 11 and extend along the width of the box body 1. An arcuate portion 19 connected to the box body 1 is provided between the two clips 13. A heat sink 8 matching the shape of the package of the axial diode 3 is clamped between the two clips 13. The heat sink 8 is arc-shaped, with the bottom of the heat sink 8 affixed to the arcuate portion 19 and the top of the heat sink 8 affixed to the package of the axial diode 3. The bottom of the heat sink 5 rests on the limiting bosses 16. The heat sink 8 and heat sink 5 are made of aluminum, while the terminal piece 4 is made of copper.

[0039] The inner wall of the box body 1 is provided with a reinforcement 14, and the inner wall of the box body 1 is provided with a snap 17. The edge of the cover plate 2 is provided with a snap notch 21 that engages with the snap 17. The cover plate 2 is snap-fitted and fixed in the top opening of the box body 1, and the bottom of the cover plate 2 is against the top of the reinforcement 14.

[0040] The axial diode junction box of this embodiment also includes a wire clip 7 and a cable. A crimping port 15 is provided at one end of the box body 1. A crimping portion 46 corresponding to the position of the crimping port 15 is provided on the terminal piece 4 near the crimping port 15. One end of the cable is crimped and fixed in the crimping portion 46, and the other end of the cable extends out of the box body 1 through the wire clip slot on the box body 1. The wire clip 7 is fixed in the wire clip slot by ultrasonic welding to limit the cable position. Example 2

[0041] See Figure 6 and Figure 7 The remaining components of the axial diode junction box of this embodiment are identical to those of Example 1, except that the cable, wire clip 7, and rivet 6 are not included. A horizontal extension 53 is provided on the end of the heat sink 5, away from the axial diode 3. Both sides of the extension 53 are provided with vertically downwardly angled hems. The retaining post 18, with its body 181, sequentially passes through the corresponding heat sink retaining openings 52 and terminal strip retaining openings 45, securing the heat sink 5 and terminal strip 4 within the box body 1 through heat fusion or cold pressing.

[0042] Obviously, the above embodiments are merely examples for the purpose of clearly illustrating the embodiments of the present invention and are not intended to limit the embodiments of the present invention. Those skilled in the art will readily appreciate that other variations or modifications based on the above description are possible. It is not necessary and impossible to enumerate all embodiments here. However, obvious variations or modifications arising from the spirit of the present invention remain within the scope of protection of the present invention.

Claims

1. An axial diode junction box, comprising a box body (1), a cover plate (2), an axial diode (3) and a terminal piece (4), wherein the box body (1) is in the shape of an elongated strip, the cover plate (2) is detachably fixed to the top of the box body (1), and the terminal piece (4) is fixed inside the box body (1), characterized in that: The axial diode (3) is arranged along the width direction of the box body (1); the terminal pieces (4) are in two pieces and are arranged at intervals along the length direction of the box body; the terminal pieces (4) are punched to form a terminal piece punching groove (41) on the upper surface of the terminal piece (4) and simultaneously form a raised portion (42) on the lower surface of the terminal piece (4); the packaging portion of the axial diode (3) is located between the two terminal pieces (4); and the two pins of the axial diode (3) are respectively fixed to the raised portion (42) of the terminal piece (4) from below by resistance welding.

2. The axial diode junction box according to claim 1, characterized in that: The box body (1) further comprises two heat sinks (5) spaced apart along the length direction of the box body (1), the heat sinks (5) being located below the terminal piece (4) and affixed to the bottom of the corresponding terminal piece (4), the terminal piece (4) and the heat sink (5) being both L-shaped, the heat sink (5) being provided with heat sink stamping grooves (51) matching the shapes of the two pins of the axial diode (3), the two pins of the axial diode (3) being respectively located in the corresponding heat sink stamping grooves (51), and the heat sink stamping grooves (51) affixed to the pins of the axial diode (3).

3. The axial diode junction box according to claim 1, characterized in that: The raised portion (42) is provided with an arc-shaped groove with an opening facing downwards and matching the shape of the pins of the axial diode (3); the two pins of the axial diode (3) are respectively welded and fixed in the corresponding arc-shaped groove.

4. The axial diode junction box according to claim 1, characterized in that: Each terminal piece (4) is provided with a folded portion (44) extending vertically downward at its edge, and a notch (43) opening downward and matching the pin position of the axial diode (3) is provided on the folded portion (44), wherein the notch (43) is larger at the bottom and smaller at the top; the terminal piece stamping groove (41) and the raised portion (42) are both waist-shaped; and a tin block (9) is provided above the terminal piece (4).

5. The axial diode junction box according to claim 2, characterized in that: The bottom of the box body (1) is provided with a limiting column (18) arranged in a vertical direction, the terminal piece (4) is provided with a terminal piece limiting opening (45) whose shape matches the limiting column (18), and the heat sink (5) is provided with a heat sink limiting opening (52) whose shape matches the limiting column (18), and the terminal piece limiting opening (45) and the heat sink limiting opening (52) are arranged cocentrically; the limiting column (18) comprises a boss portion (182) and a column portion (181) arranged from bottom to top, the top of the boss portion (182) abuts against the bottom of the heat sink (5), and the limiting column (18) passes through the corresponding heat sink limiting opening (52) and the terminal piece limiting opening (45) in sequence through its column portion (181), and fixes the heat sink (5) and the terminal piece (4) in the box body (1) by its own hot melting or cold pressing.

6. The axial diode junction box according to claim 2, characterized in that: The bottom of the box body (1) is provided with a limiting column (18) arranged in a vertical direction, the terminal piece (4) is provided with a terminal piece limiting opening (45) whose shape matches the limiting column (18), and the heat sink (5) is provided with a heat sink limiting opening (52) whose shape matches the limiting column (18), the terminal piece limiting opening (45) and the heat sink limiting opening (52) are arranged cocentrically and are fixed together by riveting a rivet (6); the limiting column (18) includes a boss portion (182) and a column portion (181) arranged from bottom to top, the top of the boss portion (182) abuts against the bottom of the heat sink (5), and the limiting column (18) passes through the rivet (6) in sequence through its column portion (181) to fix the heat sink (5) and the terminal piece (4) in the box body (1) by its own hot melting or cold pressing.

7. The axial diode junction box according to claim 2, characterized in that: The bottom of the box body (1) is provided with two limiting bosses (16) arranged along the width direction of the box body (1), the inner sides of the two limiting bosses (16) are provided with two bus bar grooves (11) penetrating the box body (1), the inner sides of the two bus bar grooves (11) are provided with two clamping strips (13) arranged along the width direction of the box body (1), an arc-shaped portion (19) connected to the box body (1) is provided between the two clamping strips (13), and a heat sink (8) matching the shape of the packaging portion of the axial diode (3) is clamped between the two clamping strips (13), the heat sink (8) is arc-shaped, the bottom of the heat sink (8) is attached to the arc-shaped portion (19), and the top of the heat sink (8) is attached to the packaging portion of the axial diode (3); the bottom of the heat sink (5) is against the limiting bosses (16); the heat sink (8) and the heat sink (5) are aluminum sheets, and the terminal sheet (4) is a copper sheet.

8. The axial diode junction box according to any one of claims 1 to 7, characterized in that: The inner wall of the box body (1) is provided with a reinforcement member (14), the inner wall of the box body (1) is provided with a snap fastener (17), the edge of the cover plate (2) is provided with a snap-fitting notch (21) that engages with the snap fastener (17), the cover plate (2) is snap-fitted and fixed in the top opening of the box body (1), and the bottom of the cover plate (2) abuts against the top of the reinforcement member (14).

9. The axial diode junction box according to any one of claims 1 to 7, characterized in that: It also includes a line card (7) and a cable, wherein one end of the box body (1) is provided with a crimping interface (15), and a crimping portion (46) corresponding to the position of the crimping interface (15) is provided on the terminal piece (4) near the crimping interface (15), one end of the cable is crimped and fixed in the crimping portion (46), and the other end of the cable passes through the line card slot on the box body (1) and extends out of the box body (1), and the line card (7) is fixed in the line card slot by ultrasonic welding to limit the cable.

10. The axial diode junction box according to claim 2, characterized in that: An end of the heat sink (5) away from the axial diode (3) is provided with an extension portion (53) arranged in a horizontal direction, and two sides of the extension portion (53) are provided with folded edges extending vertically downward.

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