Processing technology of extra thick copper strip for connectors

Abstract

The object of the present invention is to disclose a processing technology for ultra-thick copper strips for connectors, comprising the following steps: rolling a copper strip blank into a first copper strip with a thickness of 7mm-10mm; hood annealing the first copper strip to obtain a second copper strip; connecting the adjacent second copper strips through a copper plate with a thickness of 0.5mm-2mm; continuously cleaning and passivating the second copper strip to obtain a third copper strip; shearing the third copper strip into an ultra-thick copper strip for new energy of a set size. The beneficial effects of the present invention are: the thickness of the 7mm-10mm thick copper strip reaches 14mm-20mm when overlapped, and this thickness exceeds the limits of existing equipment and processes. The present invention connects adjacent second copper strips with a thickness of 7mm-10mm through a copper plate with a thickness of 0.5mm-2mm, the overlap thickness is small, and the overlap is easy to achieve, thereby realizing continuous cleaning and passivation of the ultra-thick copper strip for new energy, improving production efficiency, and reducing production costs, and providing a basis for slitting into ultra-thick copper busbar connectors for fast charging.

Description

Technical Field

[0001] The invention relates to the technical field of ultra-thick copper strip processing for new energy, and in particular to an ultra-thick copper strip processing technology for connecting parts. Background Art

[0002] With the rapid development and popularization of new energy vehicles, the battery life and charging rate of vehicles are increasingly valued. In terms of charging rate, the continuous improvement of charging rate has put higher and higher requirements on the conductors of charging connectors. At present, charging connectors mainly use copper bars. The thicker the copper bars, the greater the charging rate they can withstand. At present, copper strips for preparing copper bars with a conventional thickness of 4mm-6mm can be continuously cleaned and passivated, but ultra-thick copper strips exceeding 6mm cannot be continuously cleaned due to process limitations. As a result, copper bars exceeding 6mm can only be washed by block washing, that is, cleaning the copper bars piece by piece, which has low cleaning efficiency, resulting in high cost of ultra-thick copper bars and cannot adapt to the market. The copper bus is cut from copper strips of a certain thickness. During the preparation of the copper strips, the surface of the rolled copper strips needs to be cleaned and passivated. To achieve continuous cleaning and passivation, after a roll of copper strips is fully unfolded and cleaned, its tail needs to be connected to the head of another roll of copper strips for continuous cleaning and passivation. When two rolls of copper strips with a thickness of 6 mm are connected, the thickness at the joint reaches 12 mm, which has reached the joint thickness limit. Therefore, the current 6 mm thick copper strips have reached the process limit. The obstacle to this thickness limit is that it is impossible to connect two adjacent rolls of copper strips with a thickness of more than 6 mm, and thus it is impossible to continuously clean the copper strip coils with a thickness of more than 6 mm, resulting in low processing efficiency of copper strips with a thickness of more than 6 mm and the cost cannot adapt to the market.

[0003] In view of this, it is urgent to develop a processing technology for ultra-thick copper strips used for connectors to overcome the above-mentioned defects. Summary of the invention

[0004] The purpose of the present invention is to disclose a processing technology for ultra-thick copper strips used for connectors, by which adjacent second copper strips with a thickness of 7mm-10mm are connected through a copper plate with a thickness of 0.5mm-2mm, so as to realize continuous cleaning and passivation of the ultra-thick copper strips, improve production efficiency and reduce production costs.

[0005] To achieve the above-mentioned object of the invention, the present invention provides a processing technology for ultra-thick copper strips for connectors, comprising the following steps:

[0006] Rolling the copper strip blank into a first copper strip having a thickness of 7 mm to 10 mm;

[0007] The first copper strip is subjected to hood annealing to obtain a second copper strip;

[0008] Connecting the adjacent second copper strips via a copper plate with a thickness of 0.5 mm to 2 mm;

[0009] The second copper strip is continuously cleaned and passivated to obtain a third copper strip;

[0010] The third copper strip is cut into an ultra-thick copper strip for new energy of a set size.

[0011] Preferably, the copper strip blank has a thickness of 12 mm-20 mm.

[0012] Preferably, the method further comprises the following steps:

[0013] The copper strip blank is subjected to surface milling.

[0014] Preferably, the method further comprises the following steps:

[0015] The first copper strip is trimmed for head, tail and plate shape.

[0016] Preferably, the hood annealing temperature is 380° C., the temperature is raised for 4 hours, and the temperature is maintained for 6 hours.

[0017] Preferably, after the hood annealing is completed, the steel is air-cooled to below 280° C. and then water-cooled to room temperature.

[0018] Preferably, the distance between adjacent second copper strips is 0 cm-20 cm.

[0019] Preferably, the copper plate is placed on top of the adjacent second copper strip.

[0020] Preferably, the copper plate is pressed onto or welded onto the adjacent second copper strip.

[0021] Preferably, the welding is argon arc welding.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] (1) When the conventional overlapping method is used to connect adjacent copper strips, the thickness of the 7mm-10mm thick copper strips reaches 14mm-20mm when overlapped. This thickness exceeds the limits of existing equipment and processes, and it is impossible to overlap 7mm-10mm strips. The present invention connects adjacent second copper strips with a thickness of 7mm-10mm through a copper plate with a thickness of 0.5mm-2mm. The overlapping thickness is small and the overlapping is easy to achieve. The continuous cleaning and passivation of the ultra-thick copper strips for new energy are realized, the production efficiency is improved, the production cost is reduced, and the basis is provided for slitting into ultra-thick copper busbar connectors for fast charging. The problem that the ultra-thick copper busbar can only be cleaned piece by piece is solved, and the production cost of the ultra-thick copper busbar is greatly reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 The figure is a process flow chart of the ultra-thick copper strip processing of the present invention.

[0025] Figure 2 It is a schematic diagram of the existing adjacent second copper belt connection structure of the present invention.

[0026] Figure 3 This is a schematic diagram of the adjacent second copper belt connection structure of the present invention.

[0027] Among them, 1. the second copper strip rolled in the front; 11. the tail; 2. the second copper strip rolled in the back; 21. the head; 3. the copper plate. DETAILED DESCRIPTION

[0028] The present invention is described in detail below in conjunction with the various embodiments shown in the accompanying drawings, but it should be noted that these embodiments are not limitations of the present invention, and any equivalent transformations or substitutions in functions, methods, or structures made by ordinary technicians in the field based on these embodiments are all within the scope of protection of the present invention.

[0029] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thick", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as limiting the present invention.

[0030] Embodiment 1

[0031] See also Figure 1 and Figure 2 , this embodiment provides a processing technology for ultra-thick copper strips for connectors, comprising the following steps:

[0032] Step S1: rolling the copper strip blank into a first copper strip with a thickness of 7mm-10mm; specifically, the thickness of the copper strip blank is 12mm-20mm, preferably 12mm or 16mm, and the rolled copper strip blank is cold rolled to a first copper strip with a thickness of 7mm-10mm, preferably 8mm. Before rolling, the copper strip blank is milled, and milling refers to milling the top, bottom and side of the copper strip blank to eliminate surface defects; after rolling, the first copper strip is trimmed at the head and tail and the plate shape to form a rolled first copper strip.

[0033] Step S2: the first copper strip is subjected to hood annealing to obtain a second copper strip; specifically, the first copper strip in a roll is subjected to hood annealing at a temperature of 380°C, the temperature is raised for 4 hours, and the temperature is kept for 6 hours. After the hood annealing is completed, the first copper strip is air-cooled to below 280°C and then water-cooled to room temperature. The second copper strip obtained by the hood annealing is annealed in a relatively static state, so the annealing efficiency is high and the space occupied is small.

[0034] Step S3: Connect the adjacent second copper strips through a copper plate with a thickness of 0.5 mm to 2 mm; specifically, the prior art adopts Figure 2 The method shown in the figure is to directly overlap the front second copper strip 1 and the rear second copper strip 2. If a copper strip with a thickness of 7 mm to 10 mm is used for overlap, the minimum thickness of the overlap is 14 mm, which exceeds the thickness limit of the existing pressing or welding equipment and cannot be realized, affecting the continuous cleaning and passivation of the ultra-thick copper strip. For this reason, the overlap method of this embodiment is referred to in Figure 3 When the front second copper strip 1 is unwound to the tail 11, the unwound is stopped, and the rear second copper strip 2 is unwound, and the head 21 of the rear second copper strip 2 is close to the tail 11 of the front second copper strip 1, so that the distance between the head 21 and the tail 11 is 0cm-20cm, that is, the distance between adjacent second copper strips is 0cm-20cm, preferably 5cm, 10cm or 15cm, and then the two ends of the copper plate 3 with a thickness of 0.5mm-2mm are respectively placed on the top of the head 21 and the tail 11, and the thickness of the copper plate 3 is preferably 1mm, that is, the copper plate 3 is placed on the adjacent The contact surface between the copper plate 3 and the head 21 is the first joint, and the contact surface between the copper plate 3 and the tail 11 is the second joint. The copper plate 3 is pressed or welded on the top of the adjacent second copper strip, that is, the first joint and the second joint are fixed by pressing or welding. The maximum thickness of the first joint and the second joint is 12 mm. The existing pressing or welding equipment can be used to connect the front and rear rolls of the second copper strip, which is prepared for the continuous cleaning and passivation of the copper strip. Argon arc welding is preferably used for welding, which further provides a basis for ultra-thick copper strips for new energy.

[0035] Step S4: the second copper strip is continuously cleaned and passivated to obtain a third copper strip; specifically, since the thickness of the second copper strip is 7 mm-10 mm, preferably 8 mm, the second copper strip of this thickness needs to be threaded through multiple transmission rollers during cleaning and passivation. Since the second copper strip is thick and difficult to bend, a lot of manpower and time are required during threading. If continuous cleaning and passivation cannot be achieved, the production efficiency and cost of the ultra-thick copper strip for new energy will be greatly affected. Therefore, in order to ensure continuous cleaning and passivation, it is necessary to connect the adjacent second copper strips through step S4 to achieve continuous cleaning and passivation, thereby ensuring the production efficiency and production cost of the ultra-thick copper strip for new energy.

[0036] Step S5: Cut the third copper strip into an ultra-thick copper strip for new energy of a set size. Specifically, cleaning, passivation and shearing will not affect the thickness of the copper strip. Therefore, the thickness of the third copper strip and the ultra-thick copper strip for new energy are both 7mm-10mm, preferably 8mm. The ultra-thick copper strip for new energy is prepared into copper bars by cutting, which realizes the batch continuous production of 7mm-10mm thick copper bars, with high production efficiency and cost that is more in line with the market, solving the problem that currently only the maximum thickness of 6mm copper bars can be produced in batches. Copper bars prepared from ultra-thick copper strips for new energy, such as 8mm thick copper bars, can be used as connectors for vehicle charging, and can charge vehicles with larger currents, which can greatly improve charging efficiency.

[0037] In this embodiment, the adjacent second copper strips with a thickness of 7mm-10mm are connected by a copper plate with a thickness of 0.5mm-2mm. The overlap thickness is small and the overlap is easy to achieve, thereby realizing continuous cleaning and passivation of the ultra-thick copper strips for new energy, improving production efficiency, and reducing production costs. It provides a basis for slitting into ultra-thick copper busbar connectors for fast charging, solves the current problem that ultra-thick copper busbars can only be cleaned piece by piece, and greatly reduces the production cost of ultra-thick copper busbars.

Claims

1. Processing technology of ultra-thick copper strip for connectors, characterized in that: The following steps are involved: Rolling the copper strip blank into a first copper strip having a thickness of 7 mm to 10 mm; The first copper strip is subjected to hood annealing to obtain a second copper strip, wherein the hood annealing temperature is 380° C., the temperature is raised for 4 hours, and the temperature is kept for 6 hours. After the hood annealing is completed, the second copper strip is cooled by air to below 280° C. and then cooled by water to room temperature; The adjacent second copper strips are connected by a copper plate with a thickness of 0.5 mm to 2 mm, the copper plate is placed on top of the adjacent second copper strips, and the copper plate is pressed or welded on top of the adjacent second copper strips; The second copper strip is continuously cleaned and passivated to obtain a third copper strip; The third copper strip is cut into an ultra-thick copper strip for new energy of a set size.

2. The ultra-thick copper strip processing process for connectors according to claim 1, characterized in that: The thickness of the copper strip blank is 12 mm-20 mm.

3. The ultra-thick copper strip processing process for connectors according to claim 1, characterized in that: The following steps are also included: The copper strip blank is subjected to surface milling.

4. The ultra-thick copper strip processing process for connectors according to claim 1, characterized in that: The following steps are also included: The first copper strip is trimmed for head, tail and plate shape.

5. The ultra-thick copper strip processing process for connectors according to any one of claims 1 to 4, characterized in that: The distance between adjacent second copper strips is 0 cm-20 cm.

6. The process for processing an ultra-thick copper strip for a connector according to claim 5, characterized in that: The welding is argon arc welding.

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