Charging aluminum bar terminal reinforcing structure and manufacturing method thereof

Abstract

The invention relates to the technical field of ultrasonic welding, and provides a charging aluminum row terminal reinforcing structure and a manufacturing method thereof.The charging aluminum row terminal reinforcing structure comprises an aluminum row terminal, a plug-in terminal and a fastener for fixing the aluminum row terminal and the plug-in terminal, the aluminum row terminal is provided with a groove capable of containing the plug-in terminal, and the aluminum row terminal is provided with a groove capable of containing the plug-in terminal. According to the invention, the lower holes and the upper holes are punched in the aluminum row terminal and the plug-in terminal, and the ultrasonic welding surface is riveted and reinforced by adopting a pressing riveting mode of the lower rivet, the upper rivet and the rivet sleeve, so that the ultrasonic welding surface is not damaged, and the ultrasonic welding surface is not damaged. The structure is simple, the reinforcing mode is firm, and the problems that when a copper bar and an aluminum bar are welded through traditional ultrasonic waves, due to the fact that the surface hardness of the copper bar and the aluminum bar is high, the fusion effect between molecular layers formed by mutual friction between the copper bar and the aluminum bar during ultrasonic welding is not good enough, the welding tearing force is small, and the welding face is prone to falling off are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of ultrasonic welding, and in particular to a charging aluminum bus terminal reinforcement structure and a manufacturing method thereof. Background Art

[0002] Ultrasonic welding uses high-frequency vibration waves to transmit to the surfaces of two objects to be welded. Under pressure, the two surfaces of the objects rub against each other to form a fusion between the molecular layers.

[0003] In the power transmission system, the traditional cables and plug terminals are welded by ultrasonic welding technology. Since the cable conductor is a soft copper wire or aluminum wire, it is easy to produce molecular fusion when the cable conductor and the terminal plane rub against each other, so the welding effect is relatively strong. However, when the existing power transmission system aluminum busbar terminals and copper plug terminals are welded by ultrasonic welding technology, due to the high surface hardness of the copper busbar and the aluminum busbar, the fusion effect between the molecular layers formed by the friction between the copper busbar and the aluminum busbar is not good enough when ultrasonic welding is used, the welding tear force is small, and the welding surface is easy to fall off.

[0004] In addition, the copper and aluminum bars are relatively thick (≥2mm). When using the existing ultrasonic welding technology, the energy of the welding machine's welding head is difficult to penetrate the copper and aluminum bars, resulting in welding energy loss, so that the welding melting effect is not good enough, the welding tear force is small, and the welding surface is easy to fall off. Summary of the invention

[0005] The present invention proposes a charging aluminum busbar terminal reinforcement structure and a manufacturing method thereof, which solves the problem in the prior art that the copper busbar and the aluminum busbar have high surface hardness but poor fusion effect.

[0006] The technical solution of the present invention is as follows: A charging aluminum busbar terminal reinforcement structure, comprising an aluminum busbar terminal and a plug-in terminal, and a fastener fixing the aluminum busbar terminal and the plug-in terminal, the aluminum busbar terminal is provided with a groove capable of accommodating the plug-in terminal, the groove is provided with lower holes with rectangular distribution, the plug-in terminal is provided with upper holes corresponding to the lower holes, the lower holes and the upper holes are combined to form a through hole capable of allowing the fastener to pass through, the upper and lower ends of the through hole are truncated cone-shaped hole grooves, and the middle part is a spherical hole groove, the fastener comprises a lower rivet and an upper rivet which can be respectively flatly embedded in the truncated cone-shaped hole grooves at both ends of the through hole during riveting, and a rivet sleeve which is expanded and tightened in the spherical hole groove.

[0007] Preferably, the diameter of the truncated cone-shaped hole groove at the bottom of the aluminum bar terminal gradually decreases from bottom to top, and the diameter of the truncated cone-shaped hole groove at the top of the plug-in terminal gradually decreases from top to bottom.

[0008] Preferably, a plurality of rib grooves distributed in an annular manner along the axis of the hole groove are formed in the spherical hole grooves of the lower hole and the upper hole by milling.

[0009] Preferably, the lower rivet comprises a lower nail cap, the top of which is provided with a large cylindrical section capable of passing through the lower hole from bottom to top, and the top of the large cylindrical section is provided with a small cylindrical section capable of extending into the upper hole.

[0010] Preferably, the upper rivet includes an upper nail cap, the bottom of which is provided with a hollow tube capable of passing through the upper hole from top to bottom, the hollow tube is sleeved outside the small cylindrical section, and a flange is provided on the outer side of the hollow tube.

[0011] Preferably, the rivet sleeve includes an upper pressure cap and a lower pressure cap, the upper pressure cap is arranged outside the hollow tube and abuts against the bottom surface of the flange, the lower pressure cap is arranged outside the small cylindrical section and abuts against the top surface of the large cylindrical section, and a plurality of annularly distributed expansion strips are fixed between the upper pressure cap and the lower pressure cap.

[0012] Preferably, the cross section of the expansion strip is triangular, and after expansion, it can engage with the rib groove in the compressed spherical hole groove.

[0013] Preferably, the lower nail cap is initially flat, and can be engaged with the truncated cone-shaped hole groove at the bottom of the aluminum bar terminal after riveting.

[0014] Preferably, the upper nail cap is initially mushroom-shaped, and can be engaged with the truncated cone-shaped hole groove at the top of the plug-in terminal after riveting.

[0015] Based on the above-mentioned charging aluminum bus terminal reinforcement structure, the present invention also proposes a manufacturing method of the charging aluminum bus terminal reinforcement structure, comprising the following steps:

[0016] Step 1: drilling. Before drilling, calculate the aperture offset required for ultrasonic welding, and then drill the lower hole and upper hole on the aluminum busbar terminal and the plug-in terminal respectively according to the calculated offset;

[0017] Step 2: ultrasonic welding: placing the plug-in terminal in the groove of the aluminum bus terminal, and using an ultrasonic welding machine to weld the aluminum bus terminal and the plug-in terminal after the holes are punched, so that the contact surface of the aluminum bus terminal and the plug-in terminal forms a stable ultrasonic welding surface;

[0018] Step 3: Arrange fasteners, place a rivet sleeve on the lower rivet, and insert the lower rivet with the rivet sleeve into the lower hole of the aluminum bar terminal from bottom to top, and then insert the upper rivet into the upper hole of the plug terminal from top to bottom and insert the lower rivet;

[0019] Step 4: pressure riveting. Through the compression of the press, the lower rivet and the upper rivet are respectively embedded in the truncated cone-shaped hole groove at the bottom of the aluminum bus terminal and the truncated cone-shaped hole groove at the top of the plug-in terminal, and the rivet sleeve is expanded and tightened in the spherical hole groove under the compression of the lower rivet and the upper rivet. The lower rivet and the upper rivet form a restraining structure for the aluminum bus terminal and the plug-in terminal after welding, and the expanded rivet sleeve forms a positioning structure in the through hole after welding the aluminum bus terminal and the plug-in terminal.

[0020] In addition, the present invention also proposes another method for manufacturing a charging aluminum busbar terminal reinforcement structure, comprising the following steps:

[0021] Step 1: drilling. Before drilling, calculate the aperture offset required for ultrasonic welding, and then drill the lower hole and upper hole on the aluminum busbar terminal and the plug-in terminal respectively according to the calculated offset;

[0022] Step 2: ultrasonic welding: placing the plug-in terminal on the aluminum bus terminal, and using an ultrasonic welding machine to weld the aluminum bus terminal and the plug-in terminal after the holes are punched, so that the contact surface of the aluminum bus terminal and the plug-in terminal forms a stable ultrasonic welding surface;

[0023] Step 3: Arrange fasteners. Use a T-shaped rivet with the big head at the bottom and the small head at the top to pass through the lower hole and the upper hole of the aluminum bar end from bottom to top. The small head of the T-shaped rivet extends beyond the upper hole for a certain distance.

[0024] Step 4: Press riveting. Use a concave arc-shaped mold to press the columnar part of the small head of the T-shaped rivet that protrudes from the upper hole into an arc-shaped mushroom shape from top to bottom, and cooperate with the large head of the T-shaped rivet to reinforce the aluminum bar end and the plug-in end together.

[0025] The beneficial effects of the present invention are:

[0026] 1. The present invention adopts a three-set fastening structure, punches lower holes and upper holes on the aluminum bar terminal and the plug-in terminal, and uses a lower rivet, an upper rivet and a rivet sleeve to rivet and reinforce the ultrasonic welding surface. The structure is simple and the reinforcement method is reliable. It solves the problems of poor fusion effect between molecular layers formed by mutual friction between copper bars and aluminum bars during ultrasonic welding due to the high surface hardness of copper bars and aluminum bars, low welding tear force, and easy falling off of the welding surface during traditional ultrasonic welding of copper bars and aluminum bars.

[0027] 2. The flat structural design of the lower nail cap in the present invention facilitates the lower rivet to be laid flat for subsequent riveting processing, while the mushroom-shaped structural design of the upper nail cap requires less pressing force than the flat design and is easier to press into shape. The lower nail cap can be fitted with the truncated cone-shaped hole groove at the bottom of the aluminum bar terminal after riveting, and the upper nail cap can be fitted with the truncated cone-shaped hole groove at the top of the plug-in terminal after riveting, thereby forming a restraining structure for the aluminum bar terminal and the plug-in terminal after welding through the lower nail cap of the lower rivet and the upper nail cap of the upper rivet;

[0028] 3. During the riveting process of the lower rivet and the upper rivet of the present invention, the expansion strip is compressed outward by the upper pressure cap of the upper rivet and the lower pressure cap of the lower rivet. Since the aluminum busbar terminal and the plug-in terminal are also subjected to the riveting effect, the outwardly expanded expansion strip can be engaged with the rib groove in the compressed spherical hole groove, thereby forming a positioning structure for the fastener;

[0029] 4. The fastening structure of the present invention adopts a single-piece rivet. Although the tear resistance of riveting with fasteners after ultrasonic welding is relatively weak, it has obvious advantages over the tear resistance after simple ultrasonic welding in the prior art. In addition, the material cost of the single-piece rivet riveting method is lower than that of Example 1, the method is simpler, the molding speed is faster, and the processing efficiency is higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0031] Figure 1 This is a schematic diagram of the exploded structure of the charging aluminum busbar terminal reinforcement structure in the first embodiment of the present invention;

[0032] Figure 2 This is a schematic diagram of the structure of the charging aluminum busbar terminal reinforcement structure before riveting in the first embodiment of the present invention;

[0033] Figure 3 This is a schematic diagram of the structure of the charging aluminum busbar terminal reinforcement structure after riveting in the first embodiment of the present invention;

[0034] Figure 4 This is a schematic diagram of the cross-sectional structure of the aluminum busbar terminal and the plug-in terminal in the first embodiment of the present invention;

[0035] Figure 5 This is a schematic diagram of the aluminum bar terminal structure in Embodiment 1 of the present invention;

[0036] Figure 6 This is a schematic diagram of the plug-in terminal structure in the first embodiment of the present invention;

[0037] Figure 7 This is a schematic diagram of the structure of a fastener before riveting in Embodiment 1 of the present invention;

[0038] Figure 8 This is a schematic diagram of the cross-sectional structure of the fastener before riveting in the first embodiment of the present invention;

[0039] Fig. 9 This is a schematic diagram of the structure of the fastener after riveting in the first embodiment of the present invention;

[0040] Fig.10 This is a schematic diagram of the cross-sectional structure of the fastener after riveting in the first embodiment of the present invention;

[0041] Fig.11 This is a schematic diagram of the fastener structure in the second embodiment of the present invention;

[0042] In the figure: 1, aluminum busbar terminal; 11, groove; 12, lower hole; 2, plug-in terminal; 21, upper hole; 3, fastener; 31, lower rivet; 311, lower nail cap; 312, large cylindrical section; 313, small cylindrical section; 32, upper rivet; 321, upper nail cap; 322, hollow tube; 323, flange; 33, rivet sleeve; 331, upper pressure cap; 332, lower pressure cap; 333, expansion strip. DETAILED DESCRIPTION

[0043] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0044] Embodiment 1

[0045] See also Figure 1 , Figure 2 and Figure 3The present invention provides a technical solution: a charging aluminum bus terminal reinforcement structure, comprising an aluminum bus terminal 1 and a plug-in terminal 2, and a fastener 3 for fixing the aluminum bus terminal 1 and the plug-in terminal 2. The aluminum bus terminal 1 is provided with a groove 11 capable of accommodating the plug-in terminal 2, and the contour shape of the groove 11 is adapted to the shape of the plug-in terminal 2, so that the plug-in terminal 2 can be placed in the groove 11 to fix the plug-in terminal 2, and the depth of the groove 11 is less than the thickness of the plug-in terminal 2, so as to facilitate the subsequent pressing. When the plug-in terminal 2 is placed in the groove 11 of the aluminum bus terminal 1, the aluminum bus terminal A gap necessary for high-frequency vibration of ultrasonic welding is left between the sub-1 and the plug-in terminal 2. A rectangular lower hole 12 is provided in the groove 11. An upper hole 21 corresponding to the lower hole 12 is provided on the plug-in terminal 2. The lower hole 12 and the upper hole 21 are combined to form a through hole through which the fastener 3 can pass. The upper and lower ends of the through hole are truncated cone-shaped hole grooves, and the middle part is a spherical hole groove. The fastener 3 includes a lower rivet 31 and an upper rivet 32 ​​that can be respectively embedded in the truncated cone-shaped hole grooves at both ends of the through hole during riveting, and a rivet sleeve 33 that is expanded and tightened in the spherical hole groove.

[0046] See also Figure 4 , Figure 5 and Figure 6 The diameter of the truncated cone-shaped hole groove at the bottom of the aluminum bar terminal 1 gradually decreases from bottom to top, and the diameter of the truncated cone-shaped hole groove at the top of the plug-in terminal 2 gradually decreases from top to bottom, so that after riveting, the lower nail cap 311 of the lower rivet 31 and the upper nail cap 321 of the upper rivet 32 ​​form a locking structure for welding the aluminum bar terminal 1 and the plug-in terminal 2. The spherical hole grooves of the lower hole 12 and the upper hole 21 are formed by milling to form a plurality of rib grooves distributed in an annular manner along the axis of the hole groove, so that after riveting, the expansion strip 333 of the rivet sleeve 33 after expansion is engaged with the rib groove in the spherical hole groove to form a positioning structure for the fastener 3.

[0047] See also Figure 7 , Figure 8 , Fig. 9 and Fig.10 The lower rivet 31 includes a lower nail cap 311. The lower nail cap 311 is initially flat, and can be engaged with the truncated cone-shaped hole groove at the bottom of the aluminum bar terminal 1 after riveting. The flat structural design of the lower nail cap 311 makes it easy to lay the lower rivet 31 flat for subsequent riveting processing. The top of the lower nail cap 311 is provided with a large cylindrical section 312 that can pass through the lower hole 12 from bottom to top, and the top of the large cylindrical section 312 is provided with a small cylindrical section 313 that can extend into the upper hole 21.

[0048] Furthermore, the upper rivet 32 ​​includes an upper nail cap 321, which is initially mushroom-shaped and can be engaged with the truncated cone-shaped hole groove on the top of the plug-in terminal 2 after riveting. The mushroom-shaped structure design of the upper nail cap 321 requires less pressing force than the flat design and is easier to press into shape. The bottom of the upper nail cap 321 is provided with a hollow tube 322 that can pass through the upper hole 21 from top to bottom. The hollow tube 322 is sleeved outside the small cylindrical section 313, and a flange 323 is provided on the outside of the hollow tube 322.

[0049] Furthermore, the rivet sleeve 33 includes an upper pressure cap 331 and a lower pressure cap 332. The upper pressure cap 331 is sleeved outside the hollow tube 322 and abuts against the bottom surface of the flange 323. The lower pressure cap 332 is sleeved outside the small cylindrical section 313 and abuts against the top surface of the large cylindrical section 312. A plurality of annularly distributed expansion strips 333 are fixed between the upper pressure cap 331 and the lower pressure cap 332. The cross-section of the expansion strip 333 is triangular, and after expansion, it can engage with the rib groove in the compressed spherical hole groove.

[0050] Based on the above embodiment, the present invention also proposes a method for manufacturing a charging aluminum bar terminal reinforcement structure, comprising the following steps:

[0051] Step 1: drilling. Before drilling, the aperture offset required for ultrasonic welding is calculated, and then the lower hole 12 and the upper hole 21 are respectively punched on the aluminum bus terminal 1 and the plug terminal 2 according to the calculated offset.

[0052] Step 2: ultrasonic welding: placing the plug-in terminal 2 in the groove 11 of the aluminum bus terminal 1, and using an ultrasonic welding machine to weld the aluminum bus terminal 1 and the plug-in terminal 2 after the holes are punched, so that the contact surface of the aluminum bus terminal 1 and the plug-in terminal 2 forms a stable ultrasonic welding surface;

[0053] Step 3: Arrange the fastener 3, place the rivet sleeve 33 on the outer surface of the lower rivet 31, and insert the lower rivet 31 with the rivet sleeve 33 from bottom to top into the lower hole 12 of the aluminum bar terminal 1, and then insert the upper rivet 32 ​​from top to bottom into the upper hole 21 of the plug terminal 2 and insert the lower rivet 31;

[0054] Step 4: pressure riveting. The lower rivet 31 and the upper rivet 32 ​​are respectively embedded in the truncated cone-shaped hole groove at the bottom of the aluminum bus terminal 1 and the truncated cone-shaped hole groove at the top of the plug-in terminal 2 under the compression of the press, and the rivet sleeve 33 is expanded and tightened in the spherical hole groove under the compression of the lower rivet 31 and the upper rivet 32. The lower rivet 31 and the upper rivet 32 ​​form a restraining structure for the aluminum bus terminal 1 and the plug-in terminal 2 after welding, and the expanded rivet sleeve 33 forms a positioning structure in the through hole after welding the aluminum bus terminal 1 and the plug-in terminal 2.

[0055] The specific process of riveting the fastener 3 in step 4 is as follows: when the upper nail cap 321 is compressed in the direction of the lower nail cap 311 by the pressure, the depth of the hollow tube 322 sleeved outside the small cylindrical section 313 gradually increases, and then the flange 323 outside the hollow tube 322 presses the upper pressure cap 331 downward, and the large cylindrical section 312 resists the lower pressure cap 332, so that the distance between the upper pressure cap 331 and the lower pressure cap 332 gradually decreases, and the expansion strip 333 expands outward due to the compression of the upper pressure cap 331 and the lower pressure cap 332, and since the aluminum bus terminal 1 and the plug terminal 2 are also subjected to the riveting effect, they expand outward. The expanded expansion strip 333 can be engaged with the rib groove in the compressed spherical hole groove, the lower nail cap 311 is initially flat, and can be engaged with the truncated cone hole groove at the bottom of the aluminum bus terminal 1 after riveting, and the upper nail cap 321 is initially mushroom-shaped, and can be engaged with the truncated cone hole groove at the top of the plug-in terminal 2 after riveting, so that the lower nail cap 311 of the lower rivet 31 and the upper nail cap 321 of the upper rivet 32 ​​form a restraining structure for the aluminum bus terminal 1 and the plug-in terminal 2 after welding, so that the expanded expansion strip 333 of the rivet sleeve 33 is engaged with the rib groove in the spherical hole groove to form a positioning structure for the fastener 3.

[0056] Embodiment 2

[0057] The present embodiment proposes a charging aluminum bus terminal reinforcement structure, comprising an aluminum bus terminal 1 and a plug-in terminal 2, and a fastener 3 for fixing the aluminum bus terminal 1 and the plug-in terminal 2. Different from the first embodiment, the fastener 3 in the present embodiment is a single T-shaped rivet, the large head of which is flat and the top of the small head is semi-spherical.

[0058] Based on this embodiment, the present invention proposes a method for manufacturing a charging aluminum bar terminal reinforcement structure, comprising the following steps:

[0059] Step 1: drilling. Before drilling, the aperture offset required for ultrasonic welding is calculated, and then the lower hole 12 and the upper hole 21 are respectively punched on the aluminum bus terminal 1 and the plug terminal 2 according to the calculated offset.

[0060] Step 2: ultrasonic welding: placing the plug-in terminal 2 on the aluminum bus terminal 1, and using an ultrasonic welding machine to weld the aluminum bus terminal 1 and the plug-in terminal 2 after the holes are punched, so that the contact surface of the aluminum bus terminal 1 and the plug-in terminal 2 forms a stable ultrasonic welding surface;

[0061] Step 3, arrange the fastener 3, use a rivet with a T-shaped structure, with the big head at the bottom and the small head at the top, pass through the lower hole 12 and the upper hole 22 of the aluminum bar end 11 from bottom to top, and the small head of the rivet with the T-shaped structure exceeds the upper hole 22 for a distance;

[0062] Step 4: press riveting. Use a concave arc-shaped mold to press the columnar part of the small head of the T-shaped rivet that extends beyond the upper hole 22 into an arc-shaped mushroom shape from top to bottom, and cooperate with the large head of the T-shaped rivet to reinforce the aluminum bar end 11 and the plug-in end 21 together.

[0063] Compared with the first embodiment, although the tear resistance of this embodiment after ultrasonic welding and then riveting with fasteners is relatively weaker, it has obvious advantages over the tear resistance after simple ultrasonic welding in the prior art. In addition, the single-piece rivet riveting method has lower material cost than the first embodiment, the method is simpler, the molding speed is faster, and the processing efficiency is higher.

[0064] Based on the above embodiments, the present invention compares the tearing force required to tear apart the copper bar and the aluminum bar after conventional ultrasonic welding and the tearing force required to tear apart the copper bar and the aluminum bar after ultrasonic welding and riveting reinforcement. The comparison data are shown in the following table:

[0065]

[0066]

[0067] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A charging aluminum busbar terminal reinforcement structure, comprising an aluminum busbar terminal (1) and a plug-in terminal (2), and a fastener (3) for fixing the aluminum busbar terminal (1) and the plug-in terminal (2), characterized in that: The aluminum bar terminal (1) is provided with a groove (11) capable of accommodating the plug-in terminal (2), the groove (11) is provided with lower holes (12) distributed in a rectangular manner, the plug-in terminal (2) is provided with upper holes (21) distributed corresponding to the lower holes (12), the lower holes (12) and the upper holes (21) are combined to form a through hole capable of allowing a fastener (3) to pass through, the upper and lower ends of the through hole are truncated cone-shaped hole grooves, and the middle part is a spherical hole groove, the fastener (3) comprises a lower rivet (31) and an upper rivet (32) capable of being respectively flatly embedded in the truncated cone-shaped hole grooves at the two ends of the through hole during riveting, and a rivet sleeve (33) expanded and tightened in the spherical hole groove.

2. A charging aluminum bar terminal reinforcement structure according to claim 1, characterized in that: The diameter of the truncated cone-shaped hole groove at the bottom of the aluminum bar terminal (1) gradually decreases from bottom to top, and the diameter of the truncated cone-shaped hole groove at the top of the plug-in terminal (2) gradually decreases from top to bottom.

3. A charging aluminum bar terminal reinforcement structure according to claim 1, characterized in that: A plurality of rib grooves distributed in an annular manner along the axis of the hole groove are formed in the spherical hole grooves of the lower hole (12) and the upper hole (21) by milling.

4. A charging aluminum bar terminal reinforcement structure according to claim 1, characterized in that: The lower rivet (31) comprises a lower nail cap (311), the top of which is provided with a large cylindrical section (312) capable of passing through the lower hole (12) from bottom to top, and the top of which is provided with a small cylindrical section (313) capable of extending into the upper hole (21).

5. A charging aluminum bar terminal reinforcement structure according to claim 4, characterized in that: The upper rivet (32) comprises an upper nail cap (321), the bottom of which is provided with a hollow tube (322) capable of passing through the upper hole (21) from top to bottom, the hollow tube (322) being sleeved outside the small cylindrical section (313), and a flange (323) being provided on the outer side of the hollow tube (322).

6. A charging aluminum bar terminal reinforcement structure according to claim 5, characterized in that: The rivet sleeve (33) includes an upper pressure cap (331) and a lower pressure cap (332). The upper pressure cap (331) is sleeved outside the hollow tube (322) and contacts the bottom surface of the flange (323). The lower pressure cap (332) is sleeved outside the small cylindrical section (313) and contacts the top surface of the large cylindrical section (312). A plurality of annularly distributed expansion strips (333) are fixed between the upper pressure cap (331) and the lower pressure cap (332).

7. A charging aluminum bar terminal reinforcement structure according to claim 6, characterized in that: The expansion strip (333) has a triangular cross section and can engage with the rib groove in the compressed spherical hole groove after expansion.

8. A charging aluminum bar terminal reinforcement structure according to claim 4, characterized in that: The lower nail cap (311) is initially flat, and can be engaged with the truncated cone-shaped hole groove at the bottom of the aluminum bar terminal (1) after riveting, and the upper nail cap (321) is initially mushroom-shaped, and can be engaged with the truncated cone-shaped hole groove at the top of the plug-in terminal (2) after riveting.

9. A method for manufacturing a charging aluminum bar terminal reinforcement structure, according to the charging aluminum bar terminal reinforcement structure described in claims 1-8, characterized in that: The following steps are involved: Step 1: drilling holes. Before drilling holes, the hole diameter offset required for ultrasonic welding is calculated, and then a lower hole (12) and an upper hole (21) are respectively drilled on the aluminum bus terminal (1) and the plug terminal (2) according to the calculated offset. Step 2: ultrasonic welding: placing the plug-in terminal (2) in the groove (11) of the aluminum bus terminal (1), and using an ultrasonic welding machine to weld the aluminum bus terminal (1) and the plug-in terminal (2) after the holes are punched, so that the contact surface of the aluminum bus terminal (1) and the plug-in terminal (2) forms a stable ultrasonic welding surface; Step 3: Arrange the fastener (3), place a rivet sleeve (33) on the outer surface of the lower rivet (31), and insert the lower rivet (31) with the rivet sleeve (33) from bottom to top into the lower hole (12) of the aluminum bar terminal (1), and then insert the upper rivet (32) from top to bottom into the upper hole (21) of the plug terminal (2) and insert the lower rivet (31) to tighten; Step 4: pressure riveting. Under the compression of a press machine, the lower rivet (31) and the upper rivet (32) are respectively embedded in the truncated cone-shaped hole groove at the bottom of the aluminum bar terminal (1) and the truncated cone-shaped hole groove at the top of the plug-in terminal (2). The rivet sleeve (33) is expanded and tightened in the spherical hole groove under the compression of the lower rivet (31) and the upper rivet (32). The lower rivet (31) and the upper rivet (32) form a restraining structure for the aluminum bar terminal (1) and the plug-in terminal (2) after welding. The expanded rivet sleeve (33) forms a positioning structure in the through hole after welding the aluminum bar terminal (1) and the plug-in terminal (2).

10. A method for manufacturing a charging aluminum bar terminal reinforcement structure, according to the charging aluminum bar terminal reinforcement structure described in claim 1-3, characterized in that: The following steps are involved: Step 1: drilling holes. Before drilling holes, the hole diameter offset required for ultrasonic welding is calculated, and then a lower hole (12) and an upper hole (21) are respectively drilled on the aluminum bus terminal (1) and the plug terminal (2) according to the calculated offset. Step 2: ultrasonic welding: placing the plug-in terminal (2) on the aluminum bus terminal (1), and using an ultrasonic welding machine to weld the aluminum bus terminal (1) and the plug-in terminal (2) after the holes are punched, so that the contact surface of the aluminum bus terminal (1) and the plug-in terminal (2) forms a stable ultrasonic welding surface; Step 3: Arrange the fastener (3), use a rivet with a T-shaped structure, with the large head at the bottom and the small head at the top, to pass through the lower hole (12) and the upper hole (22) of the aluminum bar end (11) from bottom to top, and the small head of the rivet with the T-shaped structure exceeds the upper hole (22) by a certain distance; Step 4: riveting. Using a concave arc-shaped mold, the columnar part of the small head of the rivet with a T-shaped structure that protrudes from the upper hole (22) is pressed into an arc-shaped mushroom shape from top to bottom, and the large head of the rivet with the T-shaped structure is matched up and down to reinforce the aluminum bar end (11) and the plug end (21) together.

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