Power connection terminal of charging device and automatic screwing method thereof

Abstract

The invention discloses a power connection terminal of a charging device and an automatic screwing method of the power connection terminal. A female terminal is provided with a containing cavity, a conductor rod is arranged in the containing cavity, and the front end of the conductor rod extends out and is provided with threads; the mounting pipe is provided with a connecting cavity which is in threaded connection with the front end; a connecting plate is arranged in the connecting cavity; a limiting part is also formed in the connecting cavity, an elastic sheet is arranged between the limiting part and the connecting plate, and the connecting plate is conducted with the conductor rod; the female terminal and the mounting tube are coaxial and have a gap; the driving device is composed of a clamping ring and a driving assembly and changes between a locking state and an unlocking state. In a locking state, the snap ring is sleeved outside the female terminal and the mounting tube; at the moment, the two are relatively circumferentially fixed; and in the unlocking state, the snap ring is sleeved outside the female terminal or the mounting pipe. Based on the technical scheme of the application, the application at least has the following effects of high stability, easiness and capability of automatically adjusting the contact force, low contact resistance, convenience in maintenance and replacement, reliable positioning, compact structure and improved safety performance.

Description

Technical Field

[0001] The present invention relates to charging of new energy vehicles, and in particular to a power connection terminal of a charging device and an automatic tightening method thereof. Background Art

[0002] With the increasing development of social economy and the further increase in energy demand, the call for new energy is getting louder and louder. Electric vehicles are driven by power battery packs, and after the power is consumed, a charging gun is needed to charge the power battery pack. During use, the charging gun needs to use its plug-in terminal to be inserted into the installation slot of its charging gun head, and the other end is inserted into the electric vehicle, thereby achieving the purpose of charging the electric vehicle. The existing charging gun terminal for charging new energy vehicles usually includes a plug-in terminal body and a plug-in end and a connecting end respectively connected to the two ends of the plug-in terminal body. The plug-in end is usually provided with a plug-in cavity for plugging. Although such a structure can realize the plug-in of the charging gun terminal, its plug-in is a rigid connection, which is prone to fatigue after multiple plug-ins and pull-outs, and the plug-in and pull-out force cannot be guaranteed, resulting in unstable plug-in and pull-out, and even separation from each other, making it difficult to guarantee the service life.

[0003] In the existing technical solutions, a tight connection is mainly achieved by electrically connecting the spring structure and the male terminal. However, in actual use, the spring may become loose under the force of plugging and unplugging, affecting the elastic contact effect of the spring. Summary of the Invention

[0004] The present invention provides a power terminal for a charging device, comprising: a female terminal, a conductor rod, a mounting tube, a driving device and a connecting plate, wherein the female terminal has a accommodating cavity, the conductor rod is fixed in the accommodating cavity, and the front end extends out of the accommodating cavity, and the front end has a thread; the mounting tube has a connecting cavity, and the connecting cavity is threadedly connected to the front end; the connecting plate is arranged in the connecting cavity; a limiting portion is also formed in the connecting cavity, and a spring sheet is arranged between the limiting portion and the connecting plate to make the connecting plate contact and conduct with the conductor rod; the female terminal and the mounting tube are coaxial and have a gap between them; the driving device consists of a clamping ring and a driving assembly, and the driving assembly drives the clamping ring to move so that it changes between a locked state and an unlocked state; the locked state is: the clamping ring is sleeved outside the female terminal and the mounting tube; at this time, the two are fixed relative to each other in the circumferential direction; the unlocked state is: the clamping ring is sleeved outside the female terminal or the mounting tube; at this time, the two are not fixed relative to each other in the axial direction.

[0005] Preferably, the unlocked state is: the clamping ring is fixedly mounted outside the mounting tube in the circumferential direction; in the unlocked state, the driving assembly also drives the clamping ring to rotate in the circumferential direction and drives the mounting tube to rotate synchronously.

[0006] Preferably, a pressure sensor is provided on the spring piece, and when the male terminal is inserted into the mounting tube, the pressure sensor detects the pressure between the male terminal and the spring piece.

[0007] Preferably, a connecting ring is installed on the limiting portion, and a spring is provided between the connecting ring and the conductor rod.

[0008] Preferably, the outer wall surfaces of the female terminal and the mounting tube are formed with corrugated structures, the inner wall surface of the clamping ring has a corresponding corrugated structure, and the clamping sleeve is outside the female terminal and the mounting tube.

[0009] Preferably, the outer wall surfaces of the female terminal and the mounting tube are polygonal, the inner wall surface of the clamping ring is a corresponding polygon, and the clamping sleeve is outside the female terminal and the mounting tube.

[0010] Preferably, a first limiting protrusion is formed on the outer wall surface of the female terminal, and a second limiting protrusion is formed on the outer wall surface of the mounting tube. The clamping ring is located between the first limiting protrusion and the second limiting protrusion, and the spring causes the clamping ring to be clamped outside the female terminal and the mounting tube at the same time; the deformation range of the spring is sufficient to completely separate the clamping ring from the female terminal.

[0011] Preferably, an accommodating surface is formed on the outer wall surface of the mounting tube, and the spring is located outside the accommodating surface and between the second limiting protrusion and the clamping ring.

[0012] Preferably, the driving assembly has a paddle, and the paddle is located between the first limiting protrusion and the clamping ring to drive the clamping ring to move toward one side of the mounting tube.

[0013] A method for automatically tightening the power terminal of the above-mentioned charging device, wherein a pressure sensor is provided on the spring piece. When the male terminal is inserted into the mounting tube, the pressure sensor detects the pressure between the male terminal and the spring piece; when the pressure value is less than or equal to a first predetermined value, the drive component is in a standby state; when the pressure is greater than the first predetermined value and less than a second predetermined value, the drive component drives the retaining ring to enter an unlocked state; when the pressure is greater than or equal to the second predetermined value, the drive component drives the retaining ring to enter a locked state.

[0014] Based on the technical solution of the present application, the present application has at least the following effects: strong stability, easy and automatic adjustment of contact force, low contact resistance, convenient maintenance and replacement, reliable positioning, compact structure, and improved safety performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a cross-sectional view of the power terminal of the charging device of the present invention.

[0016] Figure 2 Schematic diagram of the power connection terminal of the charging device of the present invention.

[0017] Figure 3 A schematic diagram of the working state of the power connection terminal of the charging device of the present invention.

[0018] Figure 4 This is another schematic diagram of the working state of the power connection terminal of the charging device of the present invention. DETAILED DESCRIPTION

[0019] The following describes embodiments of the present invention in detail, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0020] The present invention discloses a charging terminal for a charging device that can be used in charging sockets for new energy vehicles or in other electrical connection applications. The terminal provides strong stability, easily adjustable contact force, low contact resistance, convenient maintenance and replacement, reliable positioning, a compact structure, and enhanced safety.

[0021] See also Figure 1 and Figure 2 The power terminal includes: a female terminal 1, a conductor rod 2, a mounting tube 3, a connection cavity 4, a drive device 7, a connecting plate 8 and a spring 9. The female terminal 1 and the mounting tube 3 are both hollow and are used to pass through the conductor rod 2 or the male terminal 0.

[0022] The female terminal 1 has a receiving cavity, that is, the aforementioned hollow portion forms the receiving cavity, the conductor bar 2 extends into the receiving cavity, and the front end of the conductor bar 2 extends out of the receiving cavity, with a thread on the front end 21. The conductor bar 2 is fixed in the receiving cavity.

[0023] The mounting tube 3 has a connecting cavity 4, one end of which is sleeved on the outside of the conductor rod 2. The inner wall of the connecting cavity 4 is also threaded to realize the threaded connection between the mounting tube 3 and the conductor rod 2. The other end of the connecting cavity 4 is used to connect the male terminal 0. The male terminal 0 mentioned here can be a general term. In addition to the male terminal 0 corresponding to the female terminal 1, it also has other components such as conductors and communication lines, which are collectively referred to as male terminals 0 here. The male terminal can be, for example, a charging gun for a new energy vehicle. The power connection terminal of this application can be a charging interface for a new energy vehicle.

[0024] A connecting plate 8 is provided in the connecting cavity 4. The connecting plate 8 is on the side close to the conductor rod 2. The connecting plate 8 is pushed against the conductor rod 2 by the spring 9, so that the two are disconnected. At the same time, the spring 9 provides pressure toward the center when deformed to ensure a stable fixing force when the male terminal 0 is inserted. A limiting portion 31 is also formed in the connecting cavity 4. The spring 9 is provided between the limiting portion 31 and the connecting plate 8 to ensure that the connecting plate 8 is in contact with the conductor rod 2 and in conduction. Preferably, a connecting ring 5 can also be installed on the limiting portion 31, and the spring 9 is provided between the connecting ring 5 and the conductor rod 2. The limiting portion 31 reduces the inner diameter of the connecting cavity 4 at this point, on the one hand to clamp the spring 9, and on the other hand to allow the male terminal 0 to enter.

[0025] The female terminal 1 and the mounting tube 3 are coaxial and have a gap between them. By adjusting the gap between the female terminal 1 and the mounting tube 3, the deformation of the spring 9, that is, the pressure of the spring 9, can be adjusted. The mounting tube 3 is threadedly connected to the conductor bar 2, and the gap between the mounting tube 3 and the female terminal 1 can be adjusted by rotating the mounting tube 3.

[0026] To ensure that the gap remains constant after the mounting tube 3 is rotated, the snap ring 71 described below is required to provide a locked state to relatively fix the female terminal 1 and the mounting tube 3. When the gap needs to be adjusted, the snap ring 71 is unlocked to allow the mounting tube 3 to rotate. The locked and unlocked states are achieved by driving the snap ring 71 with the drive assembly 72.

[0027] The driving device 7 is composed of a clamping ring 71 and a driving assembly 72 .

[0028] The locking state is as follows: the clamping ring 71 is sleeved on the outside of the female terminal 1 and the mounting tube 3 ; that is, it is sleeved on both of them at the same time, so that the female terminal 1 and the mounting tube 3 will not move relative to each other in the circumferential direction.

[0029] The unlocked state is as follows: the clamping ring 71 is sleeved on the outside of the female terminal 1 or the mounting tube 3 ; that is, it is sleeved on only one part, and does not affect the relative movement of the female terminal 1 and the mounting tube 3 in the circumferential direction.

[0030] In a preferred embodiment, the unlocked state is: the snap ring 71 is fixedly sleeved circumferentially outside the mounting tube 3 ; that is, the snap ring 71 is detached from the female terminal 1 .

[0031] In the unlocked state, the driving assembly 72 also drives the clamping ring 71 to rotate in the circumferential direction, and drives the mounting tube 3 to rotate synchronously. The mounting tube 3 can be automatically rotated, thereby automatically adjusting the gap size and changing the pressure of the spring 9.

[0032] Spring clip 9 is provided with a pressure sensor 91. When male terminal 0 is inserted into mounting tube 3, pressure sensor 91 detects the pressure between male terminal 0 and spring clip 9. When this pressure drops to a preset level, drive assembly 72 drives retaining ring 71 into an unlocked state. Mounting tube 3 can then be rotated manually, or by the aforementioned embodiment, retaining ring 71 driven by drive assembly 72, thereby driving mounting tube 3.

[0033] Of course, in some embodiments, there may be multiple drive assemblies 72, which can independently drive the mounting tube 3 to move instead of using the clamping ring 71 as a transfer.

[0034] During operation or charging, the male terminal 0 is inserted into the spring through the connection cavity 4 to achieve electrical connection. The spring 9 is electrically connected to the conductor rod 2 through the connection plate 8. The contact surface is large, which can effectively reduce resistance.

[0035] The outer walls of the female terminal 1 and the mounting tube 3 are formed with a corrugated structure, and the inner wall of the snap ring 71 has a corresponding corrugated structure, which is clamped onto the outside of the female terminal 1 and the mounting tube 3. For example, the outer walls of the female terminal 1 and the mounting tube 3 are both circular, and one or more raised corrugations are formed on the circular outer walls. In this way, when the snap ring 71 is clamped onto the outside of the female terminal 1 and the mounting tube 3, it can prevent the female terminal 1 and the mounting tube 3 from rotating relative to each other, preventing the positional relationship between the two from changing, thereby achieving the aforementioned locked state.

[0036] In another embodiment, the outer wall surfaces of the female terminal 1 and the mounting tube 3 are polygonal, and the inner wall surface of the clamping ring 71 is a corresponding polygon, and the clamping ring is mounted outside the female terminal 1 and the mounting tube 3 .

[0037] Whether the outer wall is provided with ridges on a circular surface or is provided with a polygonal surface, the purpose is to prevent the relative position of the female terminal 1 and the mounting tube 3 from changing by the clamping ring 71 , thereby achieving the above-mentioned locking state.

[0038] The retaining ring 71 is configured to slide axially along the female terminal 1 or the mounting tube 3 to disengage from the female terminal 1 or the mounting tube 3, so that the mounting tube 3 can be rotated to adjust its positional relationship with the female terminal 1, thereby achieving the above-mentioned unlocked state.

[0039] For example, a first limiting protrusion 11 is formed on the outer wall surface of the female terminal 1, and a second limiting protrusion 32 is formed on the outer wall surface of the mounting tube 3. The snap ring 71 is located between the first limiting protrusion 11 and the second limiting protrusion 32, and the spring 6 enables the snap ring 71 to be simultaneously clamped outside the female terminal 1 and the mounting tube 3; the deformation range of the spring 6 is sufficient to ensure that the snap ring 71 is completely separated from the female terminal 1.

[0040] The spring 6 is not an essential component. When the spring 6 is not used, the movement of the snap ring 71 can be achieved entirely by the drive assembly 72. In the case of the spring 6, the drive assembly 72 does not need to be provided with the function of locking the snap ring 71, and the driving force is provided entirely by the spring 6. Of course, in the case of the spring 6, the drive assembly 72 can also be provided with the function of locking the snap ring 71 to form a redundancy.

[0041] It should be noted that although the drive device 7 is provided, it does not conflict with the manual operation of the snap ring 71. That is, the present application has both automatic and manual operation modes. The locking state and unlocking state of the snap ring 71 can be manually operated.

[0042] An accommodating surface 33 is formed on the outer wall of the mounting tube 3 . The spring 6 is located outside the accommodating surface 33 and between the second limiting protrusion 32 and the snap ring 71 .

[0043] When the spring piece is worn and the contact force decreases, the mounting tube 3 can be rotated or the mounting tube 3 can be rotated through the component 72 to bring the mounting tube 3 and the female terminal 1 closer, so that the spring piece 9 can be squeezed to restore its elasticity.

[0044] The solution of the present application, when working, achieves electrical connection by inserting the male terminal 0 into the limiting portion 31 until it is inserted into the spring sheet 9. The spring sheet is electrically connected to the conductor rod through the connecting plate, and the contact surface is large, which can effectively reduce the resistance.

[0045] During installation, that is, when installing the electrical terminal, first install the connecting ring 5, the spring piece 9 and the connecting plate 8 into the connecting cavity 4, then put the mounting tube 3 outside the conductor rod 2 and screw it, and engage the connection under the action of the threaded portion on the conductor rod 2. At this time, it is necessary to pull the clamping ring 71 or move the clamping ring 71 through the driving device 72 so that the mounting tube 3 and the female terminal 1 can rotate relative to each other, such as Figure 1 The clamping ring 71 is pulled to the left or driven to the left. When it is screwed into place, the clamping ring is released or the driving device 72 stops driving to the left, so that the clamping ring 71 is clamped on the female terminal 1 and the mounting tube 3 at the same time, thereby locking the angle of the mounting tube 3 and the position will not change.

[0046] When the spring 9 is worn and the contact force decreases, as shown in FIG. Figure 4 As shown, by moving the retaining ring 71 (manually or via the drive assembly 72), and then manually or automatically tightening the mounting tube 3, the mounting tube 3 is moved closer to the female terminal 1, thereby squeezing the spring 9, increasing the retraction range of the spring 9, thereby increasing the contact force and extending the service life of the spring. When the spring needs to be replaced, the mounting tube is unscrewed and the above installation process is repeated.

[0047] An automatic tightening method for the power terminal of the above-mentioned charging device, wherein a pressure sensor 91 is provided on the spring 9. When the male terminal 0 is inserted into the mounting tube 3, the pressure sensor 91 detects the pressure between the male terminal 0 and the spring 9;

[0048] When the pressure value is less than or equal to the first predetermined value, the drive assembly 72 is in a standby state; when the pressure is greater than the first predetermined value and less than the second predetermined value, the drive assembly 72 drives the retaining ring 71 to enter an unlocked state; when the pressure is greater than or equal to the second predetermined value, the drive assembly 72 drives the retaining ring 71 to enter a locked state.

[0049] Here, the first predetermined value is generally 0, or slightly greater than 0. At this time, the male terminal 0 is not inserted into the mounting tube, that is, the pressure sensor 91 on the spring 9 does not feel any pressure. The value slightly greater than 0 is to take into account some error effects. When the pressure detected by the pressure sensor 91 is greater than the first predetermined value and less than the second predetermined value, it means that the male terminal 0 is inserted, but the pressure of the spring 9 on the male terminal 0 is small, and there is a risk of it coming out, so it is necessary to rotate the mounting tube 3 to adjust the pressure of the spring 9. The second predetermined value can be adjusted manually. When the pressure detected by the sensor 91 is greater than or equal to the second predetermined value, it means that the male terminal 0 is inserted, and the pressure of the spring 9 on the male terminal 0 is sufficient to keep it stable and fixed.

[0050] The power connection terminal of the charging device provided by the present invention has the following beneficial effects:

[0051] Enhanced stability: The design of components such as the spring 6, the retaining ring 71 and the limiting portion 31 ensures the stability of the spring 9 after long-term use, avoiding the problem of loosening or falling off due to frequent plugging and unplugging.

[0052] Automatic adjustment: The male terminal can be automatically fixed by the driving device 7.

[0053] Easy to adjust contact force: When the contact force of the spring 9 decreases due to wear, the position of the mounting tube 3 and the female terminal 1 can be adjusted to increase the retraction amplitude of the spring, thereby improving the contact force and extending the service life of the spring.

[0054] Reduce contact resistance: A larger contact area can effectively reduce contact resistance, improve power transmission efficiency, and reduce energy loss.

[0055] Convenient maintenance and replacement: This design allows the user to easily replace the worn shrapnel 9 with simple operations, thus reducing maintenance costs and difficulty.

[0056] Reliable positioning: The clamping ring 71 cooperates with the female terminal 1 and the mounting tube 3 to ensure that the mounting tube is fixed in position and prevent it from rotating or moving during use.

[0057] Compact structure: All components are cleverly integrated together, which not only reduces space occupation, but also simplifies the overall structure and improves product reliability and durability.

[0058] Improved safety: Stable connection and low resistance help reduce heat and improve the safety of the entire charging system.

[0059] In summary, the present invention not only solves the problems existing in the prior art, but also improves the reliability and service life of the power terminal, and provides a more efficient and safe solution for charging new energy vehicles.

[0060] The above describes in detail the structure, features and effects of the present invention based on the embodiments shown in the drawings. The above is only a preferred embodiment of the present invention, but the scope of implementation of the present invention is not limited to what is shown in the drawings. Any changes made in accordance with the concept of the present invention, or modifications to equivalent embodiments with equivalent changes, which do not exceed the spirit covered by the description and drawings, should be within the scope of protection of the present invention.

Claims

1. A power terminal of a charging device, characterized in that: include: A female terminal (1), a conductor rod (2), a mounting tube (3), a drive device (7) and a connecting plate (8), wherein: The female terminal (1) has an accommodating cavity, the conductor rod (2) is fixed in the accommodating cavity, and the front end (21) extends from the accommodating cavity, and the front end (21) has a thread; The mounting tube (3) has a connecting cavity (4), and the connecting cavity (4) is threadedly connected to the front end (21); the connecting plate (8) is arranged in the connecting cavity (4); a limiting portion (31) is also formed in the connecting cavity (4), and a spring (9) is arranged between the limiting portion (31) and the connecting plate (8) to ensure that the connecting plate (8) and the conductor rod (2) are in contact and conductive. The female terminal (1) and the mounting tube (3) are coaxial, and there is a gap between them; The driving device (7) is composed of a snap ring (71) and a driving assembly (72), and the driving assembly (72) drives the snap ring (71) to move so as to change the snap ring (71) between a locked state and an unlocked state; The locking state is: the clamping ring (71) is sleeved outside the female terminal (1) and the mounting tube (3); at this time, the two are fixed relative to each other in the circumferential direction; The unlocked state is: the clamping ring (71) is sleeved outside the female terminal (1) or the mounting tube (3); at this time, the two are not fixed relative to each other in the axial direction.

2. The power terminal of the charging device according to claim 1, characterized in that: The unlocked state is: the clamping ring (71) is fixedly sleeved on the outside of the mounting tube (3) in the circumferential direction; In the unlocked state, the driving assembly (72) also drives the clamping ring (71) to rotate in the circumferential direction, and drives the mounting tube (3) to rotate synchronously.

3. The power terminal of the charging device according to claim 1, characterized in that: A pressure sensor (91) is provided on the spring piece (9). When the male terminal (0) is inserted into the mounting tube (3), the pressure sensor (91) detects the pressure between the male terminal (0) and the spring piece (9).

4. The power terminal of the charging device according to claim 1, characterized in that: A connecting ring (5) is installed on the limiting portion (31), and a spring piece (9) is arranged between the connecting ring (5) and the conductor rod (2).

5. The power terminal of the charging device according to claim 1, characterized in that: The outer wall surfaces of the female terminal (1) and the mounting tube (3) are formed with corrugated structures, the inner wall surface of the clamping ring (7) has a corresponding corrugated structure, and the clamping sleeve is outside the female terminal (1) and the mounting tube (3).

6. The power terminal of the charging device according to claim 1, characterized in that: The outer wall surfaces of the female terminal (1) and the mounting tube (3) are polygonal, the inner wall surface of the clamping ring (71) is a corresponding polygon, and the clamping sleeve is outside the female terminal (1) and the mounting tube (3).

7. The power terminal of the charging device according to any one of claims 1, 5 or 6, characterized in that: A first limiting protrusion (11) is formed on the outer wall surface of the female terminal (1), and a second limiting protrusion (32) is formed on the outer wall surface of the mounting tube (3); a snap ring (71) is located between the first limiting protrusion (11) and the second limiting protrusion (32), and a spring (6) causes the snap ring (71) to be simultaneously clamped outside the female terminal (1) and the mounting tube (3); The deformation range of the spring (6) is sufficient to completely separate the clamping ring (71) from the female terminal (1).

8. The power terminal of the charging device according to claim 7, characterized in that: An accommodating surface (33) is formed on the outer wall surface of the mounting tube (3), and the spring (6) is located outside the accommodating surface (33) and between the second limiting protrusion (32) and the snap ring (71).

9. The power terminal of the charging device according to claim 7, characterized in that: The driving assembly (72) has a paddle, which is located between the first limiting protrusion (11) and the clamping ring (71) to drive the clamping ring (71) to move toward one side of the mounting tube (3).

10. An automatic tightening method for a power terminal of a charging device according to any one of claims 1 to 9, characterized in that: A pressure sensor (91) is provided on the spring piece (9), and when the male terminal (0) is inserted into the mounting tube (3), the pressure sensor (91) detects the pressure between the male terminal (0) and the spring piece (9); When the pressure value is less than or equal to a first predetermined value, the driving component (72) is in a standby state; When the pressure is greater than a first predetermined value and less than a second predetermined value, the driving component (72) drives the clamping ring (71) to enter an unlocking state; When the pressure is greater than or equal to a second predetermined value, the driving component (72) drives the clamping ring (71) to enter a locked state.

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