Current collector structure with bent pipe structure and processing method thereof

Abstract

The invention discloses a current collector structure with a bent pipe structure and a machining method of the current collector structure, and belongs to the field of welding machining. The device comprises a flow collecting main body and a pipe body which are of a split structure, and the flow collecting main body and the pipe body are fixedly connected through brazing in a mode of prefabricating annular brazing filler metal. The complexity of a single component can be simplified by adopting split processing, the material utilization rate is improved to more than 85%, and the processing cost is reduced by 40%. And a positioning structure is arranged at the connecting position of the current collecting main body and the pipe body, so that accurate angle deviation of the bent pipe relative to the surface of the current collecting body is realized. A brazing connection mode is adopted, the heat affected zone is small, the connecting face is metallurgically bonded, and the connecting strength and the sealing performance are excellent. And when being used for a special-shaped thin-wall structure, the alloy is not easy to deform and stable in processing quality, the tensile strength of a welding seam is greater than or equal to 90% of that of base metal, and the runner pressure drop is reduced by 20-30% compared with that of traditional welding. And the connecting surface is subjected to plasma activating treatment before welding, so that the problem of poor wettability of the brazing filler metal is effectively solved, and the brazing connecting performance and the machining quality are guaranteed.

Description

Technical Field

[0001] The present invention relates to the field of welding processing, and particularly relates to a current collector structure with a bent pipe structure and a processing method thereof. Background Art

[0002] A high-precision fluid transmission system is a technical system for precisely controlling, distributing, and transporting fluids (liquids or gases), and is widely used in fields such as semiconductor manufacturing, biomedicine, precision chemistry, and microfluidic chips. Its core goal is to achieve precise control of flow rate, pressure, temperature, and composition to meet high process requirements or experimental needs.

[0003] In fluid transmission systems, such as the battery cooling pipelines of new energy vehicles and the aerospace hydraulic systems, due to the need for the overall equipment layout, the use of some special-shaped structural workpieces is common, especially current collectors with bent pipe structures. For such workpieces, due to the particularity of their structures, the bent pipe joints are not in the same plane as the current collectors and have certain angular and positional differences, making the production and processing difficult.

[0004] When using an integrated machine for processing, due to the complex angles of the bent pipes and the positional differences of the current collectors, there are tool interference situations, and it is necessary to continuously change the processing positions and angles of the tools, resulting in a long processing cycle; moreover, the material utilization rate of the integrated machine processing is relatively low, only about 50% - 60%. When using a split processing method and then assembling and connecting in the subsequent process, since the thickness of the workpieces used in the fluid transmission system is usually not high, and the traditional welding process has a large heat input, it is easy to cause deformation of the thin-walled pipe fittings (the deformation amount can reach 0.5 - 1 mm), the yield rate is relatively low, and the defective products need to be corrected twice, and the correction difficulty is high; using adhesive bonding or mechanical connection methods has problems of poor sealing performance and cannot meet the requirements of high-pressure fluid systems. Summary of the Invention

[0005] The present invention provides a current collector structure with a bent pipe structure and a processing method thereof, which can solve the problems of difficult processing and low yield rate of special-shaped parts of the current collector for flow transmission systems existing in the prior art in welding processing.

[0006] The object of the present invention can be achieved by the following technical solutions:

[0007] A current collector structure with a bent pipe structure, comprising:

[0008] A current collecting main body, the current collecting main body includes a shell, a current collecting cavity is opened in the shell, a shunt port communicated with the current collecting cavity is arranged on one side of the shell, a docking hole communicated with the current collecting cavity is opened on the side of the shell far from the shunt port, and a positioning protrusion protruding towards the center is arranged on the inner wall of the docking hole;

[0009] The pipe body, the pipe body includes a connecting part, a bent part and a straight part which are of an integral structure, the straight part and the connecting part are respectively located at both ends of the bent part; the connecting part includes a docking head and a stepped part, the outer diameter dimension of the docking head matches the aperture dimension of the docking hole, and the dimension of the stepped part is larger than the aperture dimension of the docking hole; a positioning notch matching the positioning protrusion is formed on the docking head;

[0010] Wherein, the pipe body and the current collecting main body are processed and produced separately by a split structure, and the two are fixedly connected by brazing with a prefabricated annular filler metal, and the annular filler metal matches the outer diameter of the docking head.

[0011] In one aspect of the present invention: a separating part is fixedly arranged in the middle of the current collecting cavity for dividing the current collecting cavity into two connected parts and communicating with two shunt ports respectively.

[0012] In one aspect of the present invention: the angular range corresponding to the arc track where the bent part is located is 15° to 150°.

[0013] In one aspect of the present invention: the dimension of one end of the connecting part in the pipe body is larger than the dimension of one end of the straight part.

[0014] In one aspect of the present invention: the length dimension of the docking head is not greater than the thickness dimension of the housing.

[0015] A processing method for a current collector structure with a bent pipe structure, comprising the following steps:

[0016] Obtain a split-structured current collecting main body, a pipe body and a prefabricated annular filler metal;

[0017] Perform plasma activation treatment on the connecting surfaces of the current collecting main body and the pipe body to improve the wettability of the filler metal;

[0018] Sheathe the annular filler metal on the docking head of the pipe body, and then insert the docking head into the docking hole on the current collecting main body to complete the assembly of the pipe body and the current collecting main body;

[0019] Adopt laser spot welding to pre-weld and fix the pipe body and the current collecting main body;

[0020] Place the pre-welded workpiece on a brazing rack, and then send it into a brazing furnace for heating and brazing in a nitrogen protection atmosphere;

[0021] After welding is completed, perform airtightness detection on the product and verify the burst pressure.

[0022] In one aspect of the present invention: the surface roughness requirement of the inner cavity of the housing is Ra≤1.6μm.

[0023] In one embodiment of the present invention: the coaxiality of the docking head and the docking hole is ≤0.1 mm, and the gap is 0.05 - 0.15 mm.

[0024] In one embodiment of the present invention: the heating rate during the brazing process is 10 - 20 °C / min; the brazing temperature is 580 - 620 °C, and the holding time is 3 - 8 min.

[0025] In one embodiment of the present invention: the brazing fixture includes a base frame, on which several support blocks are fixedly arranged. The top of the support block has a flat support surface, and a stable hole corresponding to the pipe orifice joint at the bottom of the current collector body is provided on the support block. A support rod is fixedly arranged on the base frame, and the support rod is located on the side of the support block. The height difference between the top surface of the support rod and the support surface corresponds to the height difference between the bottom of the pipe body and the ground of the current collector body. A support beam is fixedly connected to the base frame, and a wind shield is placed above the support beam.

[0026] According to a current collector structure with a bent pipe structure and its processing method of the present invention, it has at least one of the following technical effects: the current collector body and the pipe body are of a split structure and are fixedly connected by brazing with a prefabricated annular filler metal. The split processing can simplify the complexity of a single component, increase the material utilization rate to more than 85%, and reduce the processing cost by 40%. A positioning structure is provided at the connection position of the current collector body and the pipe body, so that the bent pipe can achieve an accurate angular offset relative to the surface of the current collector. By using the brazing connection method, the heat affected zone is small, the connection surface has metallurgical bonding, and the connection strength and sealing performance are excellent. Moreover, when used for special-shaped thin-walled structures, it is not easy to deform, the processing quality is stable, the tensile strength of the weld seam is ≥90% of the base material, and the flow channel pressure drop is reduced by 20% - 30% compared with traditional welding. The connection surface is subjected to plasma activation treatment before welding, effectively solving the problem of poor wettability of the filler metal and ensuring the brazing connection performance and processing quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The above and / or additional aspects and advantages of the present invention will become obvious and easy to understand in the description of the embodiments in conjunction with the following drawings. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts. Among them:

[0028] Figure 1 is a three-dimensional structure schematic diagram of an overall current collector structure with a bent pipe structure provided by the present invention;

[0029] Figure 2 is a current collector structure with a bent pipe structure provided by the present invention Figure 1 in a top view structure schematic diagram;

[0030] Figure 3A current collector structure with a bent pipe structure provided by the present invention Figure 1 Front view structural schematic diagram in

[0031] Figure 4 A current collector structure with a bent pipe structure provided by the present invention Figure 1 Side view structural schematic diagram in

[0032] Figure 5 Three-dimensional structural schematic diagram of the current collector main body in a current collector structure with a bent pipe structure provided by the present invention

[0033] Figure 6 A current collector structure with a bent pipe structure provided by the present invention Figure 5 Top view structural schematic diagram

[0034] Figure 7 Three-dimensional structural schematic diagram of the pipe body in a current collector structure with a bent pipe structure provided by the present invention

[0035] Figure 8 A current collector structure with a bent pipe structure provided by the present invention Figure 7 Bottom view structural schematic diagram

[0036] Figure 9 Three-dimensional structural schematic diagram of the brazing frame in a current collector structure with a bent pipe structure provided by the present invention

[0037] Explanation of reference numerals:

[0038] 10. Current collector main body; 11. Docking hole; 12. Pipe orifice joint

[0039] 20. Pipe body; 21. Bent head part; 22. Connection part

[0040] 30. Brazing frame; 31. Bottom frame; 32. Support block; 33. Support rod; 34. Support beam Detailed implementation manners

[0041] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0042] An existing current collector special-shaped part with a bent pipe structure for a fluid transmission system includes a current collecting main body 10 and a pipe body 20. The current collecting main body 10 includes a shell, a current collecting cavity is formed inside the shell, one side of the shell may include a flow dividing port communicated with the current collecting cavity, and the flow dividing port may be in the form of a pipe joint 12. A pipe body 20 is fixedly connected to the other side of the shell, and the internal flow channel of the pipe body 20 is communicated with the current collecting cavity.

[0043] In this special-shaped part, since the pipe body 20 of the elbow joint is not in the same plane as the current collecting main body 10 of the current collector, and there are certain angular and positional differences between the pipe body 20 and the current collector, the production and processing are difficult. If the integrated machine processing production method is adopted, due to the complex angle of the elbow and the positional difference of the current collector, there is a tool interference situation, and it is necessary to continuously change the machining position and angle of the tool and the clamping state of the workpiece, resulting in a long processing cycle and great processing difficulty; moreover, the material utilization rate of the integrated machine processing is relatively low, only about 50% - 60%, and due to the positioning reference problem, the machining accuracy is also difficult to guarantee. When adopting the split processing and then assembling and connecting in the follow-up, since the thickness of the workpieces for the fluid transmission system is usually not high, both the current collector and the pipe body 20 are thin-walled structure workpieces, and the traditional welding process has a large heat input, which easily causes deformation of the thin-walled pipe fittings (the deformation amount can reach 0.5 - 1 mm), the qualified product rate is relatively low, and the defective products need secondary correction, and the correction difficulty is high; adopting the bonding or mechanical connection method has the problem of poor sealing performance and cannot meet the requirements of the high-pressure fluid system. Therefore, it is necessary to provide a current collector special-shaped part with a bent pipe structure and its processing method that are easy to process and can guarantee the accuracy and qualified product rate.

[0044] Please refer to Figures 1-9 , in one of the embodiments of the present invention, to solve the above problems, the present application provides a current collector special-shaped part structure with a bent pipe structure, which is applicable to high-precision fluid transmission systems (such as new energy vehicle battery cooling pipelines, aerospace hydraulic systems, etc.), and includes a current collecting main body 10 and a pipe body 20 processed separately. The current collecting main body 10 may be made of AL3003 aluminum alloy. The current collecting main body 10 includes a shell, the shell may be a square structure, or may be set to other shapes according to the use needs or layout requirements, such as circular or irregular shapes. A current collecting cavity is formed inside the shell, and two pipe joints 12 may be fixedly connected to one side of the shell for serving as flow dividing ports. A dividing part may be fixedly arranged in the middle of the current collecting cavity for dividing the current collecting cavity into two connected parts and communicating with the two flow dividing ports respectively. The communication between the two parts of the current collecting cavity may be realized by setting a notch at one end of the dividing part.

[0045] Please refer to Figures 1-9, in one embodiment of the present invention, the pipe body 20 and the current collecting main body 10 are processed and produced separately with a split structure, and the two are fixedly connected by brazing. Specifically, the pipe body 20 includes a bent head portion 21 with an integral structure and a direct current portion and a connection portion 22 located at both ends thereof respectively. Among them, the angular range corresponding to the arc track where the bent head portion 21 is located can be 15° to 150°. Its wall thickness can be 2 mm, and its inner diameter can be 10 mm. To reduce the resistance and pressure loss of the fluid during transmission, and at the same time ensure the structural strength and avoid damage due to stress concentration at the bending part, its curvature radius can be selected within a suitable numerical range according to actual needs. Specifically, as an example, when it is a long-radius elbow, its curvature radius is equal to 1.5 times the outer diameter of the pipe, that is, R = 1.5D; when it is a short-radius elbow, the curvature radius of the short-radius elbow is equal to the outer diameter of the pipe, that is, R = 1.0D, where D is the elbow diameter and R is the curvature radius. Further, the size of one end of the connection portion 22 in the pipe body 20 can be larger than the size of one end of the direct current portion to achieve a smooth transition of the fluid, reduce the resistance and pressure loss of the fluid during transmission.

[0046] Please refer to Figures 1-9 , in one embodiment of the present invention, the direct current portion is used to connect other structures of the system, and the connection portion 22 is used to connect the current collecting main body 10. Specifically, a docking hole 11 communicating with the current collecting cavity is opened on the housing. The connection portion 22 includes a docking head and a stepped portion. The outer diameter of the docking head is the same as the aperture of the docking hole 11, and the size of the stepped portion is larger than the aperture size of the docking hole 11 to form a flange structure. During assembly, the docking head is inserted into the docking hole 11 and brazed, thereby completing the fixed connection of the separately processed current collecting main body 10 and the pipe body 20, realizing the steering connection of the fluid (such as coolant) transmission path, and meeting the requirement of changing the flow direction of the pipeline system. Further, the length dimension of the docking head is not greater than the thickness dimension of the housing, and a chamfer, a fillet or an inclined guiding surface can be provided at one end of the docking head away from the stepped portion, so as to facilitate the plug-in installation, reduce the disturbance to the fluid, ensure the smooth transition of the fluid, and reduce the resistance and pressure loss of the fluid during transmission.

[0047] Please refer to Figures 1-9 , in one embodiment of the present invention, when there are specific requirements for the angular position of the bent pipe, for example, please refer to Figure 2, the extending direction of the pipe body 20 has a certain angular offset relative to the edge of the current collector body 10. At this time, a positioning structure can be provided at the connection position of the butt joint and the butting hole 11 to ensure that the elbow joint is fixed at a predetermined angle without deviation. The positioning structure may include a positioning protrusion and a positioning notch. The positioning protrusion is provided on the butting hole 11 and / or the butt joint, and the positioning notch is provided at the position of the butt joint and / or the butting hole 11. The precise positioning and installation of the pipe body 20 are achieved by providing the positioning structure, preventing the components from rotating circumferentially during installation. Preferably, the positioning protrusion is formed by the inner wall of the butting hole 11 protruding towards the center, that is, the positioning protrusion is provided at the inner wall position of the butting hole 11, and the positioning notch is a notch on the butt joint with an annular structure, that is, the positioning notch is provided at the position of the butt joint. In this way, it is more convenient for processing and production. At the same time, it helps to ensure the connection between the two and the sealing performance after connection.

[0048] The processing method of the current collector structure with an elbow structure as described above includes the following steps:

[0049] Obtain the current collector body 10, the pipe body 20 and the annular filler metal of the split structure; each component can be obtained by purchasing or self-processing. Among them, the pipe body 20 can be processed by the method of "numerical control pipe bending", that is, through a pipe bender, set parameters such as the bending angle and speed according to the processing technology, and bend the straight hollow pipe blank into an elbow to ensure an angular tolerance of ±0.5°; the current collector body 10 can be formed by "CNC machining", that is, computer numerical control machining. During machining, the surface roughness requirement of its inner cavity is Ra≤1.6μm.

[0050] The joining surfaces of the current collector body 10 and the tube body 20 are subjected to plasma activation treatment to improve the wettability of the solder. After the aluminum alloy surface is plasma-activated, its surface energy state changes, becoming more active, the contact angle decreases, and the hydrophilicity increases. This makes it easier for the solder to spread and adhere on the aluminum alloy surface, improves the wettability of the solder, and is conducive to the formation of a good soldered joint. The active groups and defects formed on the aluminum alloy surface by plasma activation can have a stronger chemical bonding and physical adsorption effect with the solder. At the same time, the increase in surface roughness also increases the contact area between the solder and the base material, making the bond between the solder and the aluminum alloy base material more firm, thereby improving the strength of the soldered joint. Specifically, poor solder wettability refers to the phenomenon that the solder cannot spread and adhere well on the surface of the base material during the soldering process. The specific manifestation is that the solder forms balls, that is, the solder does not spread on the surface of the aluminum alloy (i.e., the base material), but aggregates into balls, with an obvious boundary between the solder and the base material, and a good bond cannot be formed. If the solder forms balls, it means that there may be a pile-up of the solder solution, with more solder solution in some places and less in others, and there may be virtual soldering or incomplete soldering, and a good bond cannot be formed. In this way, the welding performance will be seriously affected. To avoid the above situation, in this embodiment, through the method of plasma activation treatment, gas is ionized by an electric field or a magnetic field to form plasma, and the high-energy particles in the plasma act on the surface of the aluminum alloy. On the one hand, the active particles in the plasma can effectively remove pollutants such as oil stains, oxides, and dust on the surface of the aluminum alloy, provide a clean surface for soldering, reduce the hindrance of impurities to the wetting and bonding of the solder, and help improve the stability of the soldering quality. On the other hand, the high-energy particles break the chemical bonds of the atoms on the surface of the aluminum alloy, form defects such as active groups or holes, change the surface chemical properties, and thus can effectively improve the adhesion ability of the solder in the subsequent soldering process, enabling the solder to spread, adhere, and bond well. As an example, the plasma activation treatment process can be: placing the aluminum alloy workpiece to be treated in a plasma treatment device, and the device generates plasma and guides it to the surface of the workpiece for treatment. Parameters such as gas type, pressure, discharge power, and treatment time need to be controlled during the treatment. For example, common gases include air, argon, nitrogen, etc. By changing the gas type and ratio, different functional groups can be introduced on the aluminum alloy surface, thereby achieving different treatment effects.

[0051] The annular filler metal is sleeved on the joint of the pipe body 20, and then the joint is inserted into the docking hole 11 on the current collector body 10 to complete the assembly of the pipe body 20 and the current collector body 10; during the assembly process, it is necessary to pay attention to aligning the positioning notch on the joint with the positioning protrusion in the docking hole 11 to ensure the accurate circumferential positioning of the two; the annular filler metal is set in a circular ring shape, and its inner diameter, outer diameter and thickness are adapted to the dimensions of the pipe fittings to be welded. The annular filler metal can be prefabricated, and it can be an aluminum-based filler metal. After the filler metal melts, it can effectively fill the gap at the joint of the elbow pipe and the current collector. The prefabrication process is standardized, which can ensure that the brazing quality of different batches is stable and consistent, meeting the quality requirements of mass production.

[0052] Laser spot welding is used to pre-weld and fix the pipe body 20 and the current collector body 10; ensure that the coaxiality of the elbow pipe and the current collector is ≤0.1 mm, and the gap is controlled to be 0.05 - 0.15 mm. Through pre-welding, the butt-jointed pipe body 20 and the current collector body 10 are preliminarily fixed to ensure their relative stability during the welding process and prevent offset, ensuring the machining accuracy. During the pre-welding process, attention needs to be paid to the position of the welding spot to avoid affecting the annular filler metal. As an example, the position of the welding spot can be set between the outer circle of the stepped part and the top surface of the current collector body 10.

[0053] The pre-welded workpiece is placed on the brazing fixture 30 and then sent into the brazing furnace for brazing. After the filler metal melts, it fills the gap between the pipe body 20 and the current collector body 10 through capillary action to form a dense metallurgical bonding layer, fixedly connecting the elbow pipe and the current collector. Specifically, brazing is carried out by heating in a nitrogen protection atmosphere. The heating rate during the brazing process is 10 - 20 °C / min, and the brazing temperature is selected according to the material. The method of this application is applicable to aluminum alloy, stainless steel, and titanium alloy pipe fittings with a wall thickness of 2 - 5 mm. As an example, in this embodiment, for a workpiece made of aluminum alloy: 580 - 620 °C, and the holding time is 3 - 8 min.

[0054] Please refer to Figure 9, in one embodiment of the present invention, the brazing fixture 30 includes a base frame 31, and a plurality of support blocks 32 are fixedly arranged on the base frame 31. The support blocks 32 can be made of graphite. The top of the support block 32 is provided with a flat support surface for placing the current collector body 10 to keep it stable. Further, a stable hole corresponding to the pipe orifice joint 12 at the bottom of the current collector body 10 is formed in the support block 32. During use, the current collector body 10 is placed on the support surface, and its pipe orifice joint 12 is located in the stable hole, fully ensuring the stability of the product during the welding process. Further, a support rod 33 is fixedly arranged on the base frame 31. The support rod 33 is located on the side of the support block 32. The height difference between the top surface of the support rod 33 and the support surface corresponds to the height difference between the bottom of the pipe body 20 and the ground of the current collector body 10. When the current collector body 10 is placed on the placement surface after pre-welding, the bottom of the end of the pipe body 20 far from the current collector body 10 is exactly on the support rod 33. That is, when the current collector body 10 is placed on the support block 32, the bottom end of the DC part of the pipe body 20 can be located on the top surface of the support rod 33 and in contact therewith. Thus, during the welding process, the support rod 33 supports the distal end of the pipe body 20 (the end far from the current collector body, i.e., the DC part), ensuring the relative stability between the two during the welding process and preventing relative movement, thereby ensuring the processing accuracy and quality. Still further, a support beam 34 is fixedly connected to the base frame 31. A wind shield (not shown in the figure) can be placed above the support beam 34. The wind shield is located above the product during the brazing process and is used for shielding, ensuring the stability of the product during the welding process and preventing deviation. The wind shield can be set in a V shape or an L shape, or can be set in other shapes. The support rod 33 and the wind shield ensure that the elbow joint is fixed at a predetermined angle and does not deviate due to external factors.

[0055] After the welding is completed, the airtightness of the product is detected. Specifically, a "helium mass spectrometer leak detector" can be used to test the sealing performance (leakage rate ≤ 1×10 -6 Pa·m 3 / s), and the burst pressure (≥ 2 times the working pressure) is verified through a "pulse hydraulic test". After the applicant blocked the brazed current collector using a blocking tooling, helium leak detection was carried out. The measured leakage amount was 6.2E - 08 mbar*L / S, and after converting the unit, it was 6.2×10 -9 Pa·m 3 / s.

[0056] The present application provides a current collector structure with a bent pipe structure and a processing method thereof. Among them, the current collector main body 10 and the pipe body 20 are of a split structure and are fixedly connected by brazing in the way of prefabricated annular filler metal. The split processing can simplify the complexity of a single component, improve the material utilization rate to more than 85%, and reduce the processing cost by 40%. A positioning structure is arranged at the connection position of the current collector main body 10 and the pipe body 20, so that the bent pipe can achieve an accurate angular offset relative to the surface of the current collector. By adopting the brazing connection method, the heat affected zone is small, the metallurgical bonding of the joint surface is realized, and the connection strength and sealing performance are excellent. Moreover, when it is used for special-shaped thin-walled structures, it is not easy to deform, the processing quality is stable, the tensile strength of the weld seam is ≥ 90% of the base material, and the flow channel pressure drop is reduced by 20% - 30% compared with traditional welding. Before welding, the joint surface is subjected to plasma activation treatment to effectively solve the problem of poor wettability of the filler metal and ensure the brazing connection performance and processing quality.

[0057] The above has described a specific embodiment of the present invention in detail, but the content described is only a preferred embodiment of the present invention and cannot be considered as limiting the scope of implementation of the present invention. Any equivalent changes and improvements made within the scope of the application of the present invention should still fall within the scope covered by the claims of the present invention.

[0058] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the present invention is usually placed during use. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention. In addition, the terms "first", "second", "third", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance. In the description of the present invention, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0059] In the description of the present invention, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may include direct contact between the first and second features, or may include indirect contact between the first and second features through additional features therebetween. Moreover, the first feature being "above", "over" and "on" the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature has a higher horizontal height than the second feature. The first feature being "below", "under" and "beneath" the second feature includes the first feature being directly below and obliquely below the second feature, or simply indicating that the first feature has a lower horizontal height than the second feature.

[0060] In the description of the present invention, it should also be noted that unless otherwise clearly specified and defined, the terms "arrangement" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

Claims

1. A current collector structure with a bent pipe structure, characterized in that Comprising: A current collecting main body, the current collecting main body includes a housing, a current collecting cavity is provided in the housing, a diversion port communicated with the current collecting cavity is arranged on one side of the housing, a docking hole communicated with the current collecting cavity is arranged on the side of the housing far from the diversion port, and a positioning protrusion protruding towards the center is arranged on the inner wall of the docking hole; A pipe body, the pipe body includes an integrally structured connecting part, a bent part and a direct current part, the direct current part and the connecting part are respectively located at both ends of the bent part; the connecting part includes a docking head and a stepped part, the outer diameter dimension of the docking head matches the aperture dimension of the docking hole, and the dimension of the stepped part is larger than the aperture dimension of the docking hole; a positioning notch matching the positioning protrusion is arranged on the docking head; Wherein, the pipe body and the current collecting main body are processed and produced separately by a split structure, and the two are fixedly connected by a brazing method of a prefabricated annular filler metal, and the annular filler metal matches the outer diameter of the docking head.

2. The current collector structure with a bent pipe structure according to claim 1, characterized in that, A separating part is fixedly arranged in the middle of the current collecting cavity for dividing the current collecting cavity into two communicating parts and respectively communicating with two diversion ports.

3. A current collector structure with a bent pipe structure according to claim 1, characterized in that, The angular range corresponding to the arc track where the bent part is located is 15° to 150°.

4. The current collector structure with a bent pipe structure according to claim 1, characterized in that, The dimension of one end of the connecting part in the pipe body is larger than the dimension of one end of the direct current part.

5. The current collector structure with a bent pipe structure according to claim 1, characterized in that The length dimension of the docking head is not greater than the thickness dimension of the housing.

6. A processing method of a current collector structure with a bent pipe structure according to any one of claims 1 to 5, characterized in that, Including the following steps: Obtain a current collecting main body, a pipe body with a split structure and a prefabricated annular filler metal; Perform plasma activation treatment on the connecting surfaces of the current collecting main body and the pipe body to improve the wettability of the filler metal; Sheathe the annular filler metal on the docking head of the pipe body, and then insert the docking head into the docking hole on the current collecting main body to complete the assembly of the pipe body and the current collecting main body; Adopt laser spot welding to pre-weld and fix the pipe body and the current collecting main body; Place the pre-welded workpiece on a brazing rack, and then send it into a brazing furnace for heating and brazing in a nitrogen protection atmosphere; After the welding is completed, perform airtightness detection on the product and verify the burst pressure.

7. The processing method of a current collector structure with a bent pipe structure according to claim 6, characterized in that, The surface roughness requirement of the inner cavity of the housing is Ra≤1.6μm.

8. The processing method of a current collector structure with a bent pipe structure according to claim 6, characterized in that The coaxiality of the docking head and the docking hole is ≤0.1mm, and the gap is 0.05 - 0.15mm.

9. The processing method of a current collector structure with a bent pipe structure according to claim 6, characterized in that, The heating rate during the brazing process is 10 - 20°C / min; the brazing temperature is 580 - 620°C, and the holding time is 3 - 8min.

10. The processing method of a current collector structure with a bent pipe structure according to claim 6, characterized in that, The brazing rack includes a bottom rack, a plurality of support blocks are fixedly arranged on the bottom rack, a flat support surface is arranged on the top of the support blocks, a stable hole corresponding to the pipe joint at the bottom of the current collecting main body is arranged on the support blocks, a support rod is fixedly arranged on the bottom rack, the support rod is located on the side of the support blocks, and the height difference between the top surface of the support rod and the support surface corresponds to the height difference between the bottom of the pipe body and the ground of the current collecting main body. A support beam is fixedly connected to the bottom rack, and a wind shield is placed above the support beam.

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