Manufacturing method of pole

Abstract

The invention discloses a manufacturing method of a pole column, which comprises the following steps: providing a metal column body and a metal sleeve, the inner diameter of the metal sleeve is greater than the outer diameter of the metal column body, and the axial length of the metal column body and the axial length of the metal sleeve are respectively greater than or equal to two times of the axial length of the pole column; nanopores are formed in the outer surface of the metal cylinder and the inner surface of the metal sleeve; the metal cylinder is placed in a metal sleeve, a resin layer is formed in a gap between the metal cylinder and the metal sleeve, the resin layer is attached to the outer surface, where the nanopores are formed, of the metal cylinder and the inner surface, where the nanopores are formed, of the metal sleeve in a matched mode, and the metal cylinder, the metal sleeve and the resin layer form a pole blank; and cutting the pole blank along the radial direction of the metal cylinder to form a plurality of poles. The manufacturing method of the pole is used for improving the production efficiency of the pole and realizing batch production of the pole.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to a method for manufacturing a pole. Background Art

[0002] With the development of new energy technologies, electric energy has been gradually applied to various devices such as vehicles. Electric energy is mainly stored in batteries, which are installed in corresponding devices to supply energy to the devices. One of the main components of the battery is the pole, which can be used as the positive or negative pole of the battery so that the battery can output or input current.

[0003] In the process of manufacturing batteries, poles are generally produced separately. After the poles are produced, they are welded with other parts of the battery through welding processes to achieve the installation of the poles. Existing poles are generally prepared separately, and one pole is produced in each preparation process. The preparation efficiency of poles is low and cannot be mass-produced. Summary of the invention

[0004] The object of the present invention is to provide a method for manufacturing a pole, so as to improve the production efficiency of the pole and realize mass production of the pole.

[0005] The purpose of the present invention is achieved by the following technical solutions:

[0006] A method for manufacturing a pole, comprising:

[0007] Providing a metal cylinder and a metal sleeve, wherein the inner diameter of the metal sleeve is greater than the outer diameter of the metal cylinder, and the axial length of the metal cylinder and the axial length of the metal sleeve are respectively greater than or equal to twice the axial length of the pole;

[0008] Fabricating nanopores on the outer surface of the metal cylinder and the inner surface of the metal sleeve;

[0009] The metal column is placed in the metal sleeve, and a resin layer is formed in the gap between the metal column and the metal sleeve, and the resin layer is respectively adapted to the outer surface of the metal column forming the nanopore and the inner surface of the metal sleeve forming the nanopore, and the metal column, the metal sleeve and the resin layer constitute a pole blank;

[0010] The pole blank is cut along the radial direction of the metal column to form a plurality of poles.

[0011] Preferably, the “manufacturing nanopores on the outer surface of the metal cylinder and the inner surface of the metal sleeve” comprises:

[0012] Nanopores are manufactured on the outer surface of the metal cylinder and the inner surface of the metal sleeve by chemical treatment and electrochemical treatment. Nanopores are prepared on the entire outer surface of the metal cylinder or the portion of the outer surface that is in contact with the resin layer. Nanopores are prepared on the entire outer surface of the metal sleeve or the portion of the outer surface that is in contact with the resin layer.

[0013] Preferably, the inner diameter of the metal sleeve is 0.8-2 mm larger than the outer diameter of the metal cylinder; and the axial length of the metal cylinder is greater than the axial length of the metal sleeve.

[0014] Preferably, the step of “placing the metal cylinder in the metal sleeve” includes:

[0015] The metal cylinder is placed in the metal sleeve so that the metal cylinder is coaxial with the central axis of the metal sleeve; a gap of 0.4-1 mm is formed between the metal cylinder and the metal sleeve, and at least one end of the metal cylinder protrudes from the metal sleeve by at least 10 mm.

[0016] Preferably, the step of “forming a resin layer in the gap between the metal column and the metal sleeve” includes:

[0017] Filling the gap between the metal column and the metal sleeve with insulating resin, providing a ventilator and exposing the air extraction end of the ventilator to the gap, and sealing the gap;

[0018] The insulating resin is melted, and the gas in the gap is extracted using a venting device so that the insulating resin fully fills the gap.

[0019] Preferably, the insulating resin is one or more of polyphenylene sulfide, polyetheretherketone, high-performance liquid crystal aromatic polyester fiber, polybutylene terephthalate, polyamide 6, nylon 6, polyamide 66, nylon 66, and polyphthalamide resin.

[0020] Preferably, the “providing a ventilation device and exposing the air extraction end of the ventilation device to the gap, and sealing the gap” includes:

[0021] Support members are respectively arranged at opposite ends of the gap along the axial direction of the metal sleeve, and the support members are respectively sealed and connected to the metal column and the metal sleeve to seal the opposite ends of the gap;

[0022] A vent hole connected to the gap is provided on the metal sleeve, and a vent end of the vent device passes through the vent hole and is exposed in the gap;

[0023] Wherein, the vent hole is arranged at one end of the metal sleeve.

[0024] Preferably, the “melting insulating resin and extracting the gas in the gap using a ventilator” includes:

[0025] The metal cylinder and the metal sleeve filled with insulating resin and sealed with a gap are placed in a high temperature box and heated to 260-350 degrees Celsius for 10-60 minutes; while the ventilation device extracts the gas in the gap, a protective gas is introduced into the gap.

[0026] Preferably, the protective gas is at least one of nitrogen, argon and helium;

[0027] And / or, the “forming a resin layer in the gap between the metal column and the metal sleeve” further comprises:

[0028] After the insulating resin is completely melted, the gap is pressurized to 10-200Pa and kept warm for 10-60 minutes. After the insulation is completed, the metal sleeve, the metal column and the insulating resin filled in the gap are cooled to room temperature to fix the insulating resin to obtain a pole blank.

[0029] Preferably, the metal cylinder and the metal sleeve are respectively made of aluminum alloy;

[0030] The “providing a metal column and a metal sleeve” includes: extruding an aluminum alloy substrate to form a seamless straight metal column and a seamless straight metal sleeve.

[0031] Compared with the prior art, the beneficial effects of the present invention include at least:

[0032] By adopting the pole manufacturing method of the present invention to form a pole blank formed of a metal column, a metal sleeve, and a resin layer, and making the axial directions of the metal column and the metal sleeve respectively greater than or equal to twice the axial length of the pole, the axial length of the pole blank can be greater than or equal to twice the axial length of the pole, and multiple poles can be formed by cutting the pole blank, with high generation efficiency, and mass production of poles can be achieved. In addition, the pole manufacturing method of the present invention does not require or substantially requires the participation of a mold, does not require or reduces the production cost of the mold, and can reduce or avoid the extension of the production cycle caused by the mold production time. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 is a schematic structural diagram of a pole blank, a support member and a ventilator when connected in an embodiment of the present invention;

[0034] Figure 2 It is a cross-sectional view of a pole blank, a support member and a ventilator when they are connected according to an embodiment of the present invention.

[0035] In the figure: 1. metal cylinder; 2. metal sleeve; 3. resin layer; 4. support member; 5. ventilation device; 51. ventilation valve; 52. ventilation pipeline. DETAILED DESCRIPTION

[0036] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided to make the present invention more comprehensive and complete and to fully convey the concepts of example embodiments to those skilled in the art. The same reference numerals in the figures represent the same or similar structures, and thus their repeated description will be omitted.

[0037] The words expressing positions and directions described in the present invention are all explained with reference to the accompanying drawings as examples, but they can be changed as needed, and all such changes are included in the protection scope of the present invention.

[0038] The present invention provides a method for preparing a pole, comprising steps S01 to S04.

[0039] Step S01: providing a metal cylinder 1 and a metal sleeve 2, wherein the inner diameter of the metal sleeve 2 is greater than the outer diameter of the metal cylinder 1, and the axial lengths of the metal cylinder 1 and the metal sleeve 2 are respectively greater than or equal to twice the axial length of the pole.

[0040] Step S02 : manufacturing nanopores on the outer surface of the metal column 1 and the inner surface of the metal sleeve 2 .

[0041] Step S03: placing the metal column 1 in the metal sleeve 2, forming a resin layer 3 in the gap between the metal column 1 and the metal sleeve 2, and the resin layer 3 respectively fits with the outer surface of the metal column 1 forming the nanopores and the inner surface of the metal sleeve 2 forming the nanopores, and the metal column 1, the metal sleeve 2 and the resin layer 3 constitute a pole blank.

[0042] Step S04: cutting the pole blank along the radial direction of the metal cylinder 1 to form a plurality of poles.

[0043] In step S01, the metal column 1 and the metal sleeve 2 are respectively made of aluminum alloy, the metal column 1 is an aluminum column, and the metal sleeve 2 is an aluminum sleeve. The metal column 1 can be extruded from an aluminum alloy substrate to form a seamless straight metal column 1 through an extrusion process, and the metal column 1 can be used as a pole body of a pole. The metal sleeve 2 can be extruded from an aluminum alloy substrate to form a seamless straight tubular metal sleeve 2 through an extrusion process, and the metal sleeve 2 can be used as a pole sleeve of a pole.

[0044] Reference Figure 1 and Figure 2The inner diameter of the metal sleeve 2 is larger than the outer diameter of the metal cylinder 1, so that the metal sleeve 2 can be sleeved on the metal cylinder 1 and separated from the metal cylinder 1. The inner diameter of the metal sleeve 2 can be larger than the outer diameter of the metal cylinder 1 by more than 0.8, so as to facilitate the insulation separation of the metal sleeve 2 and the metal cylinder 1. The inner diameter of the metal sleeve 2 is preferably larger than the outer diameter of the metal cylinder 1 by 0.8-2 mm, so as to facilitate the insulation separation of the metal sleeve 2 and the metal cylinder 1 while avoiding the metal sleeve 2 from being too large.

[0045] In addition, the axial length of the metal cylinder 1 can be greater than the axial length of the metal sleeve 2, so that when the metal sleeve 2 is sleeved on the metal cylinder 1, at least one end of the metal cylinder 1 can protrude from the metal sleeve 2 along the axial direction of the metal cylinder 1, and the metal cylinder 1 preferably protrudes from the metal sleeve 2 at both ends. The axial length of the metal cylinder 1 is preferably greater than the axial length of the metal sleeve 2 by more than 20 mm.

[0046] In order to make the metal cylinder 1 and the metal sleeve 2 eventually form the components of multiple poles, the axial length of the metal cylinder 1 and the axial length of the metal sleeve 2 are respectively greater than or equal to twice the axial length of the pole, so that the metal cylinder 1 and the metal sleeve 2 can form the components of at least two poles after being split. Among them, the axial length of the metal sleeve 2 is positively correlated with the number of poles that the metal sleeve 2 needs to participate in forming, and the axial length of the metal sleeve 2 is greater than or equal to the sum of the axial lengths of all poles that the metal sleeve 2 needs to participate in forming.

[0047] In step S02, nanopores can be manufactured on the outer surface of the metal cylinder 1 and the inner surface of the metal sleeve 2 by chemical treatment and electrochemical treatment, wherein the nanopores can be manufactured on the entire outer surface of the metal cylinder 1, or the nanopores can be manufactured on the portion of the outer surface of the metal cylinder 1 that is in contact with the resin layer 3. Nanopores can be manufactured on the entire outer surface of the metal sleeve 2, or the nanopores can be manufactured on the portion of the outer surface of the metal sleeve 2 that is in contact with the resin layer 3.

[0048] The steps of preparing nanopores on the metal cylinder 1 and the metal sleeve 2 may include ultrasonic degreasing, roughening, alkali washing, neutralization, electrolysis, and micropore treatment. Specifically, when preparing nanopores on the metal cylinder 1 and the metal sleeve 2, first use an ultrasonic cleaning machine to remove the grease on the outer surface of the metal cylinder 1 and the inner surface of the metal sleeve 2 to complete ultrasonic degreasing. The outer surface of the metal cylinder 1 and the inner surface of the metal sleeve 2 are formed into a dense sand surface by chemical agents to complete the roughening. After the outer surface of the metal cylinder 1 and the inner surface of the metal sleeve 2 are roughened, there will be impurities on the outer surface of the metal cylinder 1 and the inner surface of the metal sleeve 2 that remain from the roughening reaction. The impurities on the outer surface of the metal cylinder 1 and the inner surface of the metal sleeve 2 are removed by alkali washing. Afterwards, the alkali and metal impurities on the outer surface of the metal cylinder 1 and the inner surface of the metal sleeve 2 are removed to complete the neutralization. The electrochemical reaction is used to form a thin oxide film on the outer surface of the metal column 1 and the inner surface of the metal sleeve 2. The oxide film has a large number of dense nano-scale pores to complete the electrolysis. The electrochemical reaction in the electrolysis can be 2Al+6OH - =Al2O3+3H2O. The nano-scale pores generated by the electrochemical reaction are further optimized by using chemical agents, and amine substances are adsorbed in the nano-scale pores to increase the bonding effect between the nano-scale pores and the resin. At this point, the preparation of the nano-pores on the metal column 1 and the metal sleeve 2 is completed.

[0049] In step S03, when placing the metal cylinder 1 in the metal sleeve 2, the central axis of the metal cylinder 1 and the metal sleeve 2 need to be coaxial. When the inner diameter of the metal sleeve 2 is 0.8-2 mm larger than the outer diameter of the metal cylinder 1, the metal cylinder 1 can maintain a gap of 0.4-1 mm with the metal sleeve 2. When the metal cylinder 1 is placed in the metal sleeve 2, in order to ensure the coaxiality of the metal cylinder 1 and the metal sleeve 2, a fixture is used to clamp the metal cylinder 1 so as to place the metal cylinder 1 in the metal sleeve 2. By making the axial length of the metal cylinder 1 greater than the axial length of the metal sleeve 2, and making the metal cylinder 1 protrude from the metal sleeve 2 after being installed in the metal sleeve 2, it is easy to clamp the metal cylinder 1 with the fixture, and avoid interference with the metal sleeve 2 when the metal cylinder 1 is installed with the fixture.

[0050] In addition, when the metal cylinder 1 is placed in the metal sleeve 2, the metal cylinder 1 and the metal sleeve 2 are arranged in the center along the axial direction of the metal cylinder 1, so that the opposite ends of the metal cylinder 1 along its axial direction protrude from the metal sleeve 2 respectively, and the distances of the opposite ends of the metal cylinder 1 along its axial direction protruding from the metal sleeve 2 are the same. When the axial length of the metal cylinder 1 is greater than the axial length of the metal sleeve 2 by more than 20 mm, the opposite ends of the metal cylinder 1 along its axial direction protrude from the metal sleeve by more than 10 mm. In other embodiments, the metal cylinder 1 and the metal sleeve 2 can also be arranged non-centrally along the axial direction of the metal cylinder 1, and the opposite ends of the metal cylinder 1 along its axial direction protrude from the metal sleeve 2 respectively, or one end of the metal cylinder 1 along its axial direction protrudes from the metal sleeve 2, and the other end is flush with the metal sleeve 2. Among them, the length of any end of the metal cylinder 1 along its axial direction protruding from the metal sleeve 2 is more than 10 mm.

[0051] When the resin layer 3 is formed in the gap between the metal column 1 and the metal sleeve 2 , steps S31 to S33 may be included.

[0052] Step S31: filling the gap between the metal column 1 and the metal sleeve 2 with insulating resin, providing a ventilating device 5 and exposing the air extraction end of the ventilating device 5 to the gap, and sealing the gap.

[0053] Step S32: Melt the insulating resin and use the venting device 5 to extract the gas in the gap so that the insulating resin fully fills the gap.

[0054] Step S33: After the insulating resin is completely melted, the gap is pressurized to 10-200 Pa and kept warm for 10-60 minutes; after the insulation is completed, the metal sleeve 2, the metal column 1 and the insulating resin filled in the gap are cooled to room temperature to fix the insulating resin to obtain a pole blank.

[0055] In step S31, the insulating resin may be one or more of polyphenylene sulfide (PPS), polyetheretherketone (PEEK), high-performance liquid crystal aromatic polyester (LCP) fiber, polybutylene terephthalate (PBT), PA6 (polyamide 6 or nylon 6), PA66 (polyamide 66 or nylon 66), and polyphthalamide resin (PPA). The insulating resin is used to insulate and separate the metal column 1 and the metal sleeve 2.

[0056] When the insulating resin is filled into the gap between the metal cylinder 1 and the metal sleeve 2, the insulating resin may be a solid resin. When the insulating resin is filled, the gap between the metal cylinder 1 and the metal sleeve 2 can be sealed. Specifically, after the insulating resin is filled, support members 4 are respectively arranged at the opposite ends of the gap along the axial direction of the metal sleeve 2, and the support members 4 are respectively sealed and connected with the metal cylinder 1 and the metal sleeve 2 to seal the opposite ends of the gap; and the support member 4 can be used to support the metal cylinder 1 and the metal sleeve 2 along the radial direction of the metal cylinder 1, so that the gap between the metal cylinder 1 and the metal sleeve 2 remains constant. Among them, the support member 4 can be welded to the metal cylinder 1 and the metal sleeve 2 respectively to achieve a sealed connection with the metal cylinder 1 and the metal sleeve 2, and the end face of the support member 4 can be flush with the end face of the support sleeve. The support member 4 can be specifically a support sleeve, the inner diameter of the support sleeve is the same as the outer diameter of the metal cylinder 1, the outer diameter of the support sleeve is the same as the inner diameter of the metal sleeve 2, and the support sleeve can be sleeved on the metal cylinder 1.

[0057] In other embodiments, a support member 4 may be provided at one end of the gap along the axial direction of the metal sleeve 2, and then insulating resin may be filled into the gap from the end of the gap where the support member 4 is not provided. After the insulating resin is filled, a support member 4 may be provided at the other end of the gap along the axial direction of the metal sleeve 2 to seal the opposite ends of the gap along the axial direction of the metal sleeve 2.

[0058] Reference Figure 2 The metal sleeve 2 may be provided with a vent hole 21 that can communicate with the gap, for example, the vent hole 21 penetrates the metal sleeve 2 in the radial direction of the metal sleeve 2, so that the vent hole 21 can connect the gap with the outside. The vent end of the vent device 5 can pass through the vent hole 21 and be exposed in the gap, so that the vent device 5 can extract gas in the gap or supply gas to the gap. The vent hole 21 can be provided at one end of the metal sleeve 2, specifically, at one end of the metal sleeve 2 along its axial direction.

[0059] In other embodiments, the vent hole 21 may also be provided on the support member 4, the vent hole 21 penetrates the support member 4 along the axial direction of the metal sleeve 2, and the vent end of the ventilation device 5 is exposed to the gap through the vent hole 21 penetrating the support member 4, so that the ventilation device 5 can extract gas in the gap or supply gas into the gap.

[0060] When the gap is sealed by the support 4 and the ventilation end of the ventilation device 5 is exposed in the gap, the gap can only be evacuated or inlet through the ventilation device 5, and the other positions of the gap are sealed. The ventilation device 5 may include a ventilation pipeline 52, a ventilation valve 51, a vacuum device and a gas supply device. The ventilation pipeline 52 can pass through the vent 21 and be exposed in the gap. The ventilation valve 51 is respectively connected to the ventilation pipeline 52, the vacuum device and the gas supply device to control the connection and disconnection between the vacuum device and the ventilation pipe and the connection and disconnection between the gas supply device and the ventilation pipe; the ventilation pipeline 52 is used to form the ventilation end of the ventilation device 5 at one end exposed in the gap. Among them, the gas supply device can be used to supply protective gas, and the protective gas can be at least one of inert gases such as nitrogen, argon, helium, etc. The ventilation pipeline 52 may be provided with two independent branches or two ventilation pipelines 52 may be provided, respectively corresponding to the vacuum pumping device and the gas supply device, so that the vacuum pumping device and the gas supply device in the ventilation device 5 can be used to evacuate the air and supply the protective gas simultaneously and independently. The connection between the ventilation pipeline 52 and the metal sleeve 2 or the support member 4 may be welding to seal the connection between the ventilation pipeline 52 and the vent hole 21.

[0061] In step S32, after the gap is sealed by the support 4 and the ventilation end of the ventilation device 5 is exposed in the gap, the whole composed of the metal column 1, the metal sleeve 2, the insulating resin and the support 4 can be placed in a high temperature box for heating to melt the insulating resin in the gap. At the same time, the ventilation device 5 can be used to evacuate the gap to remove the original gas in the gap, so that the melted liquid insulating resin can fill the nanopores formed on the outer surface of the metal column 1 and the inner surface of the metal sleeve 2, and the insulating resin can fill the gap completely to enhance the bonding force and sealing between the resin and the metal column 1 and the metal sleeve 2. Among them, when heating, the temperature can be first heated to 260-350 degrees Celsius. After heating to the required temperature, keep warm for 10-60 minutes, preferably keep warm for 30 minutes, to ensure that the insulating resin is completely melted and fills the gap.

[0062] In addition, to prevent the insulating resin from oxidative deterioration, a protective gas may be filled into the gap by a ventilator 5, and the protective gas may replace the oxygen in the gap of the insulating resin to prevent the insulating resin from oxidative deterioration. The protective gas filling and vacuuming the gap may be performed simultaneously or sequentially.

[0063] In step S33, after the insulating resin is completely melted and the gap is evacuated, the gap can be pressurized to 10-200 Pa by passing protective gas. After the heat preservation is completed, the high temperature box can be stopped, and the whole formed by the metal sleeve 2, the metal column 1, and the insulating resin can be placed in the high temperature box to cool to room temperature, or the whole formed by the metal sleeve 2, the metal column 1, and the insulating resin can be placed in the external environment to cool naturally to room temperature. After the cooling is completed, the insulating resin solidifies and forms a resin layer 3, and the metal sleeve 2, the metal column 1 and the resin layer 3 can form a pole blank.

[0064] In step S04, according to the thickness of the pole to be prepared, the pole blank is cut along the radial direction of the metal cylinder 1 to obtain a pole of corresponding thickness. When cutting the pole blank, the portion of the pole blank retaining the support block and the vent hole 21 can be cut off, and the remaining portion of the pole blank is cut to form the required pole.

[0065] Since the axial length of the metal column 1 and the metal sleeve 2 is relatively long, one pole blank can be cut to form multiple poles, thereby realizing batch manufacturing of poles, and the manufacturing efficiency of the poles is relatively high. In addition, the pole manufacturing method in the present application can be completed without the need for a mold or without substantially using a mold, which can reduce or avoid the problems of increased cost and extended production cycle caused by mold manufacturing.

[0066] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, substitute and modify the above embodiments within the scope of the invention without departing from the principles and purpose of the present invention. All such changes should fall within the scope of protection of the claims of the present invention.

Claims

1. A method for manufacturing a pole, characterized in that: include: Providing a metal cylinder and a metal sleeve, wherein the inner diameter of the metal sleeve is greater than the outer diameter of the metal cylinder, and the axial length of the metal cylinder and the axial length of the metal sleeve are respectively greater than or equal to twice the axial length of the pole; Fabricating nanopores on the outer surface of the metal cylinder and the inner surface of the metal sleeve; The metal column is placed in the metal sleeve, and a resin layer is formed in the gap between the metal column and the metal sleeve, and the resin layer is respectively adapted to the outer surface of the metal column forming the nanopore and the inner surface of the metal sleeve forming the nanopore, and the metal column, the metal sleeve and the resin layer constitute a pole blank; The pole blank is cut along the radial direction of the metal column to form a plurality of poles.

2. The method for manufacturing a pole according to claim 1, characterized in that: The “manufacturing nanopores on the outer surface of the metal cylinder and the inner surface of the metal sleeve” includes: Nanopores are manufactured on the outer surface of the metal cylinder and the inner surface of the metal sleeve by chemical treatment and electrochemical treatment. Nanopores are prepared on the entire outer surface of the metal cylinder or the portion of the outer surface that is in contact with the resin layer. Nanopores are prepared on the entire outer surface of the metal sleeve or the portion of the outer surface that is in contact with the resin layer.

3. The method for manufacturing a pole according to claim 1, characterized in that: The inner diameter of the metal sleeve is 0.8-2 mm larger than the outer diameter of the metal column; the axial length of the metal column is greater than the axial length of the metal sleeve.

4. The method for manufacturing a pole according to claim 3, characterized in that: The “placing the metal cylinder in the metal sleeve” includes: The metal cylinder is placed in the metal sleeve so that the metal cylinder is coaxial with the central axis of the metal sleeve; a gap of 0.4-1 mm is formed between the metal cylinder and the metal sleeve, and at least one end of the metal cylinder protrudes from the metal sleeve by at least 10 mm.

5. The method for manufacturing a pole according to claim 1, characterized in that: The step of “forming a resin layer in the gap between the metal column and the metal sleeve” includes: Filling the gap between the metal column and the metal sleeve with insulating resin, providing a ventilator and exposing the air extraction end of the ventilator to the gap, and sealing the gap; The insulating resin is melted, and the gas in the gap is extracted using a venting device so that the insulating resin fully fills the gap.

6. The method for manufacturing a pole according to claim 5, characterized in that: The insulating resin is one or more of polyphenylene sulfide, polyetheretherketone, high-performance liquid crystal aromatic polyester fiber, polybutylene terephthalate, polyamide 6, nylon 6, polyamide 66, nylon 66, and polyphthalamide resin.

7. The method for manufacturing a pole according to claim 5, characterized in that: The “providing a ventilator and exposing the exhaust end of the ventilator to the gap, and sealing the gap” includes: Support members are respectively arranged at opposite ends of the gap along the axial direction of the metal sleeve, and the support members are respectively sealed and connected to the metal column and the metal sleeve to seal the opposite ends of the gap; A vent hole connected to the gap is provided on the metal sleeve, and a vent end of the vent device passes through the vent hole and is exposed in the gap; Wherein, the vent hole is arranged at one end of the metal sleeve.

8. The method for manufacturing a pole according to claim 5, characterized in that: The “melting insulating resin and extracting the gas in the gap by using a ventilator” includes: The metal cylinder and the metal sleeve filled with insulating resin and sealed with a gap are placed in a high temperature box and heated to 260-350 degrees Celsius for 10-60 minutes; while the ventilation device extracts the gas in the gap, a protective gas is introduced into the gap.

9. The method for manufacturing a pole according to claim 8, characterized in that: The protective gas is at least one of nitrogen, argon and helium; And / or, the “forming a resin layer in the gap between the metal column and the metal sleeve” further comprises: After the insulating resin is completely melted, the gap is pressurized to 10-200Pa and kept warm for 10-60 minutes. After the insulation is completed, the metal sleeve, the metal column and the insulating resin filled in the gap are cooled to room temperature to fix the insulating resin to obtain a pole blank.

10. The method for manufacturing a pole according to claim 1, characterized in that: The metal cylinder and the metal sleeve are made of aluminum alloy respectively; The "providing a metal column and a metal sleeve" includes: extruding an aluminum alloy substrate to form a seamless straight metal column and a seamless straight metal sleeve.

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