Electric connection structure

Abstract

The utility model discloses an electric connection structure, which comprises a plug terminal, a fixed terminal and a cable which are connected in sequence, the plug terminal is made of conductive metal, the conductive part of the cable and the fixed terminal are made of aluminum or aluminum alloy, one end of the plug terminal is provided with a plug cavity which is plugged with a butt joint terminal, and the other end of the plug terminal is provided with a socket. The end face of the other end is provided with an axially-protruding welding table connected with one end of the fixing terminal, the other end of the fixing terminal is in compression joint or welding with a conductive part of the end portion of the cable, and at least one installation groove is formed in the peripheral face of the fixing terminal and used for being fixedly connected with a fixing device in a clamped mode. According to the utility model, the terminals of the electric connection structure are divided into the plugging terminal, the fixed terminal and the cable which are connected in sequence, and the material of the fixed terminal is changed into an aluminum material which can replace a copper material to be made into a wiring terminal, so that the weight and cost are reduced; and the problems that the charging effect is affected due to abrasion generated in the plug-in process of the all-aluminum terminal and the plug-in terminal and electrochemical corrosion is generated due to direct contact between the copper terminal and the aluminum wire can be solved.

Description

Technical Field

[0001] The utility model relates to the technical field of electric vehicles, and more specifically, to an electric connection structure. Background Art

[0002] With the increasing use of electrical connection terminals, copper terminals have become a commonly used terminal. Copper has good conductivity and is widely used. However, copper resources are in short supply, copper costs are high, and copper terminals are heavy and cannot meet the current requirements for lightweight in the field of new energy vehicles. In order to achieve lightweight cables, people use conductive materials such as aluminum and aluminum alloys that have relatively large storage capacity and relatively light weight to make terminals. However, the integral aluminum terminal does not have good mechanical properties like the copper terminal during the plug-in process with the plug-in terminal, and is prone to wear and tear, which affects the charging effect. Therefore, all-aluminum terminals cannot be used. Moreover, due to the large electrode potential difference between copper and aluminum, when the copper terminal is directly connected to the conductor of the aluminum cable, electrochemical corrosion will occur between copper and aluminum under the action of air and water. The aluminum cable conductor is susceptible to corrosion, which leads to an increase in the contact resistance of the copper-aluminum connection area. In the long-term use process, it is easy to cause power outages. In severe cases, it may burn equipment, cause explosions or fires, and affect the normal operation of the power system.

[0003] Therefore, there is an urgent need in the prior art for a solution of a copper-aluminum composite terminal to solve the above problems. Utility Model Content

[0004] One purpose of the utility model is to provide a new technical solution for an electrical connection structure to solve the problems that the one-piece copper terminal is costly and heavy, the all-aluminum terminal does not have good mechanical properties as the copper terminal during the plug-in process with the plug-in terminal, and is easily worn and affects the charging effect, and the copper terminal and the conductor of the aluminum cable are directly connected. Due to the large electrode potential difference between copper and aluminum, electrochemical corrosion will occur between copper and aluminum under the action of air and water, and the aluminum cable conductor is susceptible to corrosion, resulting in increased contact resistance in the copper-aluminum connection area.

[0005] According to the utility model, an electrical connection structure is provided, including one end of which is mounted on a fixing device and connected to a docking terminal for transmitting electric energy, including a plug-in terminal, a fixing terminal and a cable connected in sequence,

[0006] The plug-in terminal is made of conductive metal, and the conductive part of the cable and the fixed terminal are made of aluminum or aluminum alloy;

[0007] One end of the plug-in terminal has a plug-in cavity for plugging into the docking terminal, and the other end surface has an axially protruding welding platform connected to one end of the fixed terminal, and the other end of the fixed terminal is crimped or welded to the conductive part of the cable end;

[0008] At least one mounting groove is arranged on the outer peripheral surface of the fixed terminal for being clamped and fixed with the fixing device.

[0009] Optionally, the welding platform is cylindrical or truncated cone-shaped, and the end surface of the welding platform is perpendicular to the axis of the plug-in terminal.

[0010] Optionally, the outer diameter of one end of the fixed terminal connected to the plug-in terminal is greater than or equal to the outer diameter of the welding platform, and the plug-in terminal is connected to the fixed terminal by a friction welding process.

[0011] Optionally, the welding platform intrudes into the end surface of the fixed terminal, and the end surface of the fixed terminal is welded to the other end surface of the plug-in terminal and the outer surface of the welding platform.

[0012] Optionally, the plug-in cavity is formed by a plurality of elastic sheets surrounding the circumference, and expansion and contraction gaps are provided between adjacent elastic sheets. The inner diameter of the plug-in cavity gradually decreases from a side close to the fixed terminal to an opening side.

[0013] Optionally, a plating layer is provided on the inner wall of the plug-in cavity at least in an area in contact with the docking terminal.

[0014] Optionally, a mounting hole is provided along the axis of the fixed terminal, the mounting hole passes through to the bottom surface of the plug-in cavity, a temperature sensor is provided in the mounting hole, and the temperature sensor is at least partially located in the plug-in cavity.

[0015] Optionally, a wiring hole penetrating the mounting hole is radially arranged on the outer peripheral surface of the fixed terminal, and the data line of the temperature sensor is led out from the wiring hole.

[0016] Optionally, the other end of the fixed terminal is a cylindrical structure, and the conductive part of the cable end is inserted into the cylindrical structure and crimped and connected; or, the other end of the fixed terminal is a sheet structure extending axially, and the conductive part of the cable end is overlapped or butt-welded to the sheet structure.

[0017] Optionally, one end of the fixed terminal is a columnar body connected to the plug-in terminal, and the mounting groove is a circumferential annular groove arranged on the outer peripheral surface of the columnar body; the fixing device part is in the shape of a plate, a fixing hole is arranged on the fixing device, and the outer periphery of the fixing hole part has a channel connected to the outside of the fixing device, and the mounting groove is clamped in the fixing hole through the channel.

[0018] Optionally, along the axial direction of the columnar body, a sealing groove spaced apart from the mounting groove is further provided on the outer peripheral surface of the columnar body, and a sealing ring is provided in the sealing groove.

[0019] Optionally, the plug-in terminal is made of copper or copper alloy.

[0020] Optionally, the plug-in terminal is formed by machining, and the fixed terminal is formed by machining or cold heading.

[0021] Optionally, an anti-corrosion protective layer is provided at least on the outer peripheral surface of the connection surface between the plug-in terminal and the fixed terminal.

[0022] The beneficial effects of the utility model are:

[0023] 1. The structure in which the wiring terminal and the cable are connected together, which is made of the currently common copper material, is changed to an electrical connection structure formed by the plug-in terminal, the fixed terminal and the cable connected in sequence as designed in this article, and the material of the fixed terminal is replaced with aluminum or aluminum alloy. Aluminum or aluminum alloy is low in price and light in weight. The use of aluminum or aluminum material to make the fixed terminal reduces the use of copper material, reduces cost and weight at the same time, and solves the problem that the traditional integral copper terminal is heavy in weight and high in cost, and cannot meet the current requirements for lightweight in the field of new energy vehicles, and the all-aluminum terminal does not have good mechanical properties as the copper terminal during the plug-in process with the plug-in terminal, and is prone to wear and tear, which affects the charging effect.

[0024] 2. The plug-in terminal of the utility model is connected to the fixed terminal by a friction welding process. Friction welding can be stir friction welding or rotary friction welding. Friction welding is a solid phase connection and does not produce casting structure defects similar to fusion welding joints. The joints have various mechanical properties, such as fatigue, bending, and stretching. After welding, the bonding force between the plug-in terminal and the fixed terminal is high, meeting the electrical and mechanical properties of the copper-aluminum electrical connection structure.

[0025] 3. The commonly used copper terminal blocks are connected to the aluminum conductive parts of the cables. The copper terminal and the aluminum wire are directly connected and contacted, resulting in electrochemical corrosion. The integrated copper terminal of the utility model is replaced with the interconnected plug-in terminal and the fixed terminal in the electrical connection structure. The plug-in terminal is made of copper or copper alloy, and the fixed terminal is made of aluminum or aluminum alloy, which not only reduces weight but also reduces costs. In addition, the fixed terminal made of aluminum or aluminum alloy is connected to the aluminum or aluminum alloy conductive parts of the cable, which solves the problem of electrochemical corrosion caused by the direct connection between the traditional copper terminal and the aluminum wire, thereby improving the overall service life of the terminal.

[0026] Other features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the present invention and, together with the description, serve to explain the principles of the present invention.

[0028] Figure 1 This is a structural schematic diagram of an electrical connection structure of the utility model;

[0029] Figure 2 This is a schematic structural diagram of another embodiment of an electrical connection structure of the utility model;

[0030] Figure 3 This is a schematic diagram of the exploded structure of an electrical connection structure of the utility model;

[0031] Figure 4 It is a structural schematic diagram of the welding platform of the utility model invading the interior of the end surface of the fixed terminal;

[0032] Figure 5 It is a cross-sectional schematic diagram of the installation method of the temperature sensor of the utility model;

[0033] Figure 6 It is a structural schematic diagram of the conductive part of the cable end of the utility model being inserted into the cylindrical structure and then crimped and connected;

[0034] Figure 7 It is a schematic diagram of the structure in which the conductive part of the cable end of the utility model is connected to the sheet structure;

[0035] Figure 8 It is a schematic structural diagram of the clamping connection between the fixed terminal and the fixing device of the utility model.

[0036] The following are marked in the figure:

[0037] 1. Plug-in terminal; 11. Welding table; 12. Elastic sheet; 13. Expansion and contraction joint; 14. Plug-in cavity; 2. Fixed terminal; 21. Sheet structure; 22. Cylindrical structure; 23. Mounting hole; 24. Wiring hole; 25. Sealing groove; 26. Circumferential annular groove; 3. Cable; 31. Conductive part; 4. Temperature sensor; 41. Data cable; 5. Fixing device; 51. Fixing hole; 52. Channel. DETAILED DESCRIPTION

[0038] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention.

[0039] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present invention, its application, or uses.

[0040] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered as part of the specification.

[0041] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0042] According to the first aspect of the present utility model, Figure 1-Figure 8 As shown, an electrical connection structure is provided, including one end of which is installed on a fixing device 5 and connected to a docking terminal for transmitting electric energy, including a plug-in terminal 1, a fixed terminal 2 and a cable 3 connected in sequence, the plug-in terminal 1 is made of conductive metal, and the conductive part 31 of the cable 3 and the fixed terminal 2 are made of aluminum or aluminum alloy; one end of the plug-in terminal 1 has a plug-in cavity 14 for plugging with the docking terminal, and the other end face has an axially protruding welding platform 11 connected to one end of the fixed terminal 2, and the other end of the fixed terminal 2 is crimped or welded to the conductive part 31 of the end of the cable 3; at least one mounting groove is arranged on the outer peripheral surface of the fixed terminal 2 for clamping and fixing with the fixing device 5.

[0043] With the increasing use of electrical connection terminals, copper terminals have become a commonly used type of terminal. Copper is widely used due to its good conductivity. However, copper resources are in short supply, copper costs are high, and copper terminals are heavy and cannot meet the current requirements for lightweight in the field of new energy vehicles. In order to achieve lightweight cables, people use conductive materials such as aluminum and aluminum alloys that have relatively large storage capacity and relatively light weight to make terminals. However, the integral aluminum terminal does not have the good mechanical properties of the copper terminal during the plug-in process with the plug-in terminal, and is prone to wear and tear, which affects the charging effect. Therefore, all-aluminum terminals cannot be used.

[0044] The utility model changes the structure in which the wiring terminal and the cable 3 are connected together by the currently common copper material into an electrical connection structure formed by the plug-in terminal 1, the fixed terminal 2 and the cable 3 connected in sequence in the present article, and replaces the material of the fixed terminal 2 with aluminum or aluminum alloy, thereby reducing the use of copper material, not only saving costs but also reducing the weight of the entire structure, solving the problems that the traditional one-piece copper terminal is heavy and costly, and cannot meet the current requirements for lightweight in the field of new energy vehicles, and the all-aluminum terminal does not have good mechanical properties as the copper terminal during the plug-in process with the plug-in terminal, and is easily worn and affects the charging effect.

[0045] Moreover, the end face of the plug-in terminal 1 has an axially protruding welding platform 11 connected to one end of the fixed terminal 2. The welding platform 11 structure is connected to the fixed terminal 2, which is more conducive to connection, increases the bonding force between the plug-in terminal 1 and the fixed terminal 2, and makes the strength of the electrical connection structure higher, thereby increasing the electrical and mechanical properties of the copper-aluminum electrical connection structure and extending the overall service life of the terminal.

[0046] In some embodiments, Figure 3 As shown, the welding platform 11 is cylindrical or truncated cone-shaped, and the end surface of the welding platform 11 is perpendicular to the axis of the plug-in terminal 1 .

[0047] The cylindrical or truncated cone-shaped welding platform 11 has a larger connection end surface, and the connection strength between the welding platform 11 and the fixed terminal 2 is higher, thereby increasing the electrical and mechanical properties of the electrical connection structure and extending the overall service life of the electrical connection structure.

[0048] In some embodiments, Figure 1-Figure 3 As shown, the outer diameter of one end of the fixed terminal 2 connected to the plug-in terminal 1 is greater than or equal to the outer diameter of the welding platform 11, and the plug-in terminal 1 is connected to the fixed terminal 2 by a friction welding process.

[0049] Friction welding can be performed by stir friction welding or rotary friction welding. Both welding methods are solid-phase connections and do not produce casting structural defects similar to fusion welding joints. In addition, the joints have good mechanical properties, such as fatigue, bending, and tensile strength. Stir friction or rotary friction during welding can effectively remove oxide films and attached impurities on the workpiece surface, reducing the number of cleaning steps.

[0050] In some embodiments, Figure 4 As shown, the welding platform 11 intrudes into the end surface of the fixed terminal 2 , and the end surface of the fixed terminal 2 is welded to the other end surface of the plug-in terminal 1 and the outer surface of the welding platform 11 .

[0051] The welding platform 11 intrudes into the end face of the fixed terminal 2, so that the two are better connected as one, and the other end face of the plug-in terminal 1, the outer surface of the welding platform 11 and the end face of the fixed terminal 2 are welded to have a larger connection area. After the connection, the overall strength is higher, the electrical and mechanical properties of the electrical connection structure are increased, and the overall service life of the electrical connection structure can be extended.

[0052] In some embodiments, Figure 3 As shown, the plug-in cavity 14 is formed by a plurality of elastic sheets 12 surrounding the circumference, and expansion and contraction gaps 13 are provided between adjacent elastic sheets 12. The inner diameter of the plug-in cavity 14 gradually decreases from the side close to the fixed terminal 2 to the opening side.

[0053] This structural design enables the multiple elastic sheets 12 to circumferentially surround the plug-in cavity 14 to better clamp the mating terminal.

[0054] In some embodiments, the inner wall of the plug cavity 14 is provided with a plating layer at least in the area in contact with the docking terminal.

[0055] The coating on the inner wall of the plug cavity 14 is to increase the corrosion resistance and wear resistance of the inner wall, to ensure that the inner wall of the plug cavity 14 is not easily worn during repeated plugging and unplugging of the docking terminal and the plug terminal 1, to ensure the electrical connectivity between the two, and to extend the service life of the plug terminal 1.

[0056] In some embodiments, Figure 5 As shown, the fixed terminal 2 is provided with a mounting hole 23 along the axis, the mounting hole 23 penetrates to the bottom surface of the plug-in cavity 14 , a temperature sensor 4 is provided in the mounting hole 23 , and the temperature sensor 4 is at least partially located in the plug-in cavity 14 .

[0057] The temperature sensor 4 can monitor the real-time temperature of the plug-in terminal 1 and the fixed terminal 2 .

[0058] In some embodiments, Figure 5 As shown, a wiring hole 24 which is in radial communication with the mounting hole 23 is arranged on the outer circumferential surface of the fixed terminal 2 , and a data line 41 of the temperature sensor 4 is led out from the wiring hole 24 .

[0059] The temperature sensor 4 converts the real-time temperature of the plug-in terminal 1 and the fixed terminal 2 into an output signal, and transmits the output signal to the control end through the data line 41 .

[0060] In some embodiments, Figure 6 As shown, the other end of the fixed terminal 2 is a cylindrical structure 22, and the conductive part 31 at the end of the cable 3 is inserted into the cylindrical structure 22 and then crimped and connected; or Figure 7 As shown, the other end of the fixed terminal 2 is a sheet structure 21 extending in the axial direction, and the conductive part 31 at the end of the cable 3 is overlapped or butt-welded with the sheet structure 21 .

[0061] After the conductive part 31 at the end of the cable 3 is inserted into the tubular structure 22, a crimping machine is used to stamp the tubular structure 22 and the conductive part 31 into one. The advantage of crimping is mass production. By using an automatic crimping machine, stable quality products can be manufactured quickly and in large quantities.

[0062] The conductive part 31 at the end of the cable 3 is overlapped or butt-welded to the sheet structure 21. The overlapped or butt-welded connection makes the connection between the two more stable and transmits electrical energy better. Welding, also known as fusion welding, is a manufacturing process and technology for joining metals by heating, high temperature or high pressure. There are many sources of energy for modern welding, including gas flame, arc, laser, electron beam, friction and ultrasound.

[0063] In some embodiments, Figure 3 and Figure 8As shown, one end of the fixed terminal 2 is a columnar body connected to the plug-in terminal 1, and the mounting groove is a circumferential annular groove 26 arranged on the outer peripheral surface of the columnar body; the fixing device 5 is partially in the shape of a plate, and a fixing hole 51 is arranged on the fixing device 5, and the outer periphery of the fixing hole 51 partially has a channel 52 connected to the outer side of the fixing device 5, and the mounting groove is clamped in the fixing hole 51 through the channel 52.

[0064] One end of the fixed terminal 2 is a columnar body, and the columnar body and the welding platform 11 are more conducive to subsequent connection, improve the connection processing speed, and increase the connection strength. The fixed terminal 2 is clamped with the fixing hole 51 through its own installation groove, so that the plug-in terminal 1 connected to the fixed terminal 2 as a whole is also indirectly fixed on the fixing device 5. The overall structure is stably fixed, which is conducive to the plug-in cooperation between the plug-in terminal 1 and the docking terminal.

[0065] In some embodiments, Figure 3 As shown, along the axial direction of the columnar body, a sealing groove 25 spaced apart from the mounting groove is provided on the outer peripheral surface of the columnar body, and a sealing ring is provided in the sealing groove 25 .

[0066] The sealing ring is used to seal the gap between the fixed terminal 2 and the charging seat housing to prevent water vapor and impurities from entering the gap and affecting the safety of the electrical connection structure.

[0067] In some embodiments, the plug terminal 1 is made of copper or copper alloy.

[0068] In the field of electrical connection, copper has high electrical conductivity and good ductility. The plug-in terminal 1 made of copper or copper alloy is plugged and electrically connected with the docking terminal to ensure electrical connection between the two during use.

[0069] The utility model changes the traditional integrated copper terminal into an interconnected plug-in terminal 1 and a fixed terminal 2 in the electrical connection structure. The plug-in terminal 1 is made of copper or copper alloy, and the fixed terminal 2 is made of aluminum or aluminum alloy, thereby reducing the use of copper material, which not only saves costs but also reduces the weight of the entire structure. The fixed terminal 2 made of aluminum or aluminum alloy is connected to the conductive part of the cable made of aluminum or aluminum alloy, thereby solving the problem of electrochemical corrosion caused by direct connection between the traditional copper terminal and the aluminum or aluminum conductive part 31 of the cable 3, thereby improving the overall service life of the structure.

[0070] In some embodiments, the plug-in terminal 1 is formed by machining, and the fixed terminal 2 is formed by machining or cold heading.

[0071] The electrical connection structure can be formed by a combination of a plug-in terminal 1 formed by a machining process and a fixed terminal 2 formed by a machining process, or a combination of a plug-in terminal 1 formed by a machining process and a fixed terminal 2 formed by a cold heading process. Machining refers to the process of changing the external dimensions or performance of a workpiece by a mechanical device; the cold heading process is one of the new processes of metal pressure processing with little or no cutting. It is a processing method that utilizes the plastic deformation of metal under the action of external force, and with the help of a mold, redistributes and transfers the metal volume, thereby forming the required parts or blanks.

[0072] In some embodiments, an anti-corrosion protective layer is provided at least on the outer peripheral surface of the connection surface between the plug-in terminal 1 and the fixed terminal 2 .

[0073] The anti-corrosion protective layer can increase the corrosion resistance of the outer peripheral surfaces of the plug-in terminal 1 and the fixed terminal 2, thereby extending the service life of the two.

[0074] Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present invention. It should be understood by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. An electrical connection structure, one end of which is mounted on a fixing device and connected to a docking terminal for transmitting electrical energy, comprising a plug-in terminal, a fixing terminal and a cable connected in sequence, characterized in that: The plug-in terminal is made of conductive metal, and the conductive part of the cable and the fixed terminal are made of aluminum or aluminum alloy; One end of the plug-in terminal has a plug-in cavity for plugging into the docking terminal, and the other end surface has an axially protruding welding platform connected to one end of the fixed terminal, and the other end of the fixed terminal is crimped or welded to the conductive part of the cable end; At least one mounting groove is arranged on the outer peripheral surface of the fixed terminal for being clamped and fixed with the fixing device.

2. An electrical connection structure according to claim 1, characterized in that: The welding platform is cylindrical or truncated cone-shaped, and the end surface of the welding platform is perpendicular to the axis of the plug-in terminal.

3. An electrical connection structure according to claim 1, characterized in that: The outer diameter of one end of the fixed terminal connected to the plug-in terminal is greater than or equal to the outer diameter of the welding platform, and the plug-in terminal is connected to the fixed terminal by a friction welding process.

4. An electrical connection structure according to claim 1, characterized in that: The welding platform intrudes into the end surface of the fixed terminal, and the end surface of the fixed terminal is welded to the other end surface of the plug-in terminal and the outer surface of the welding platform.

5. An electrical connection structure according to claim 1, characterized in that: The plug-in cavity is formed by a plurality of elastic sheets surrounding the circumference, and expansion and contraction gaps are provided between adjacent elastic sheets. The inner diameter of the plug-in cavity gradually decreases from a side close to the fixed terminal to an opening side.

6. An electrical connection structure according to claim 1, characterized in that: The inner wall of the plug-in cavity is provided with a plating layer at least in the area in contact with the docking terminal.

7. An electrical connection structure according to claim 1, characterized in that: The fixed terminal is provided with a mounting hole along the axis, the mounting hole penetrates to the bottom surface of the plug-in cavity, a temperature sensor is arranged in the mounting hole, and the temperature sensor is at least partially located in the plug-in cavity.

8. An electrical connection structure according to claim 7, characterized in that: A wiring hole that penetrates the mounting hole is radially arranged on the outer peripheral surface of the fixed terminal, and the data line of the temperature sensor is led out from the wiring hole.

9. An electrical connection structure according to claim 1, characterized in that: The other end of the fixed terminal is a cylindrical structure, and the conductive part of the cable end is inserted into the cylindrical structure and crimped and connected; or, the other end of the fixed terminal is a sheet structure extending axially, and the conductive part of the cable end is overlapped or butt-welded to the sheet structure.

10. An electrical connection structure according to claim 1, characterized in that: One end of the fixed terminal is a columnar body connected to the plug-in terminal, and the mounting groove is a circumferential annular groove arranged on the outer peripheral surface of the columnar body; the fixing device part is in the shape of a plate, a fixing hole is arranged on the fixing device, and the outer periphery of the fixing hole part has a channel connected to the outside of the fixing device, and the mounting groove is clamped in the fixing hole through the channel.

11. An electrical connection structure according to claim 10, characterized in that: Along the axial direction of the columnar body, a sealing groove spaced apart from the mounting groove is provided on the outer peripheral surface of the columnar body, and a sealing ring is provided in the sealing groove.

12. An electrical connection structure according to claim 1, characterized in that: The plug-in terminal is made of copper or copper alloy.

13. An electrical connection structure according to claim 1, characterized in that: The plug-in terminal is formed by machining, and the fixed terminal is formed by machining or cold heading.

14. An electrical connection structure according to claim 1, characterized in that: An anti-corrosion protective layer is provided at least on the outer peripheral surface of the connection surface between the plug-in terminal and the fixed terminal.

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