Electric vehicle charging port, charging gun and their control methods

Abstract

The present invention discloses an electric vehicle charging connection mechanism and its control method, including an electric vehicle and a charging device. The charging device is connected with a charging gun through a cable. The electric vehicle is provided with a charging port Ⅰ and a charging port Ⅱ connected to the charging gun. The flange end of the charging port Ⅰ is provided with a plurality of paired first contact terminals and second contact terminals. The flange end is internally provided with a first magnet, the base of the charging port Ⅰ is internally provided with a second magnet, and the coupling port of the charging gun is internally provided with a third magnet. A position sensor is arranged in the charging port Ⅰ to detect the position of the charging gun in the charging port Ⅰ and determine whether the charging gun is in the inserted or pulled-out state through the position change. This method guides the charging gun to align with the charging port conveniently. The electric vehicle adjusts the polarity and magnetic strength of the second magnet according to the different positions and the inserted / pulled-out state of the charging gun in the charging port, so as to reduce the operating force when the charging gun is inserted or pulled out, and the operating force is stable and will not change sharply.

Description

Technical Field

[0001] The present invention relates to the technical field of electric vehicle charging ports and charging guns, and specifically to an electric vehicle charging connection mechanism and its control method. Background Technique

[0002] Electric vehicles usually are provided with an AC charging interface and / or a DC charging interface. In the prior art, the insertion and extraction force between an AC charging gun and an AC charging interface is about 100 N, and the insertion and extraction force between a DC charging gun and a DC charging interface is about 140 N. The relatively large insertion and extraction force is not user-friendly for charging operations. Especially for users with relatively weak strength, it may be difficult to insert the charging gun into the set position, resulting in charging failure. In scenarios with poor lighting conditions such as underground parking lots, it is difficult for users to see the shape and position of the charging interface clearly, and thus they may not be able to smoothly hold the charging gun and align it with the charging interface; especially for combined AC / DC charging ports, for users who are not familiar with the structural differences between the AC charging interface and the DC charging interface, it takes extra time to match the charging interface and align the insertion of the gun. Summary of the Invention

[0003] The purpose of the present invention is to provide an electric vehicle charging connection mechanism and its control method to solve the problems raised in the above background technique.

[0004] To achieve the above purpose, the present invention provides the following technical solution: an electric vehicle charging connection mechanism and its control method, including an electric vehicle and a charging device. The charging device is connected with a charging gun through a cable. The electric vehicle is provided with a charging port I and a charging port II connected to the charging gun. A battery pack is arranged inside the electric vehicle. The charging gun charges the battery pack through the charging port I. A plurality of paired first contact terminals and second contact terminals are arranged on the flange end of the charging port I. The charging gun is coupled and connected with the first contact terminals and the second contact terminals. A first magnet is arranged inside the flange end, a second magnet is arranged inside the base of the charging port I, and a third magnet is arranged inside the coupling port of the charging gun, so as to partially offset or reduce the insertion and extraction resistance between the charging gun and the charging port I through the attraction or repulsion force generated by a set magnetic field. A position sensor is arranged inside the charging port I to detect the position of the charging gun inside the charging port I and determine whether the charging gun is in an inserted or extracted state through the position change.

[0005] Preferably, the charging port I is distributed with multiple layers of magnets along the S axis. The first magnet on the flange end of the charging port I is located on the outer layer of the charging port I. A magnet a is arranged at the upper left of the charging port I, with its S pole facing the charging gun. A magnet b is arranged at the lower left of the charging port I, with its N pole facing the charging gun. A magnet c is arranged at the lower right of the charging port I, with its N pole facing the charging gun. A magnet d is arranged at the upper right of the charging port I, with its S pole facing the charging gun.

[0006] Preferably, a plurality of second magnets are axially distributed around the axis S on the inner layer of the charging port Ⅰ opposite to the outer layer. A magnet e is provided at the upper left of the charging port Ⅰ, with the S pole of the magnet e facing the charging gun. A magnet f is provided at the lower left of the charging port Ⅰ, with the N pole of the magnet f facing the charging gun. A magnet g is provided at the lower right of the charging port Ⅰ, with the N pole of the magnet g facing the charging gun. A magnet h is provided at the upper right of the charging port Ⅰ, with the S pole of the magnet h facing the charging gun.

[0007] Preferably, the charging port Ⅰ provided with the first magnet and the charging gun provided with the third magnet attract each other.

[0008] Preferably, a magnet i is provided at the upper left of the charging gun, with the N pole of the magnet i facing the charging port Ⅰ. A magnet j is provided at the lower left of the charging gun, with the S pole of the magnet j facing the charging port Ⅰ. A magnet k is provided at the lower right of the charging gun, with the S pole of the magnet k facing the charging port Ⅰ. A magnet l is provided at the upper right of the charging gun, with the N pole of the magnet l facing the charging port Ⅰ.

[0009] Preferably, the charging port Ⅱ includes an AC charging port Ⅱ and a DC charging port Ⅱ. The AC charging port Ⅱ arranges magnets in the first state, and the DC charging port Ⅱ arranges magnets in the second state different from the first state. The magnetic polarity of the magnets provided on the AC charging gun is opposite to that of the magnets in the first state.

[0010] The AC charging gun and the AC charging port Ⅱ are magnetically attracted to each other, and the DC charging gun and the DC charging port Ⅱ are magnetically attracted to each other. After the charging gun is inserted into the charging port Ⅰ, the end face of the charging gun reaches the flange end face of the charging port Ⅰ to complete the coupling. The magnetic strength of the second magnet is adjusted in real time according to the position of the charging gun, so that the operating force during the process of pulling out the charging gun is stable and does not change sharply.

[0011] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0012] 1. This method guides the charging gun to align with the charging port conveniently, which is especially beneficial for scenarios with poor lighting conditions;

[0013] 2. The AC / DC combined charging port on the electric vehicle can guide users to correctly select the charging port and align the plug gun through differential magnet settings, without relying on good line-of-sight conditions and without the need for users to have a deeper study of the charging port;

[0014] 3. The electric vehicle adjusts the polarity and magnetic strength of the second magnet according to the different positions and insertion / extraction states of the charging gun in the charging port, so as to reduce the operating force when the charging gun is inserted or pulled out, and the operating force is stable and does not change sharply. Description of the Drawings

[0015] Figure 1 It is a schematic diagram of charging an electric vehicle;

[0016] Figure 2 Schematic diagram of the charging port for an electric vehicle;

[0017] Figure 3 is Figure 2 the A-A cross-sectional view in

[0018] Figure 4 is Figure 3 the B-B cross-sectional view in

[0019] Figure 5 is Figure 3 the C-C cross-sectional view in

[0020] Figure 6 Schematic diagram of the charging gun structure;

[0021] Figure 7 is Figure 6 the D-D cross-sectional view in

[0022] Figure 8 is Figure 7 the E-E cross-sectional view in

[0023] Figure 9 is Figure 1 the partial enlarged view of the charging port area in

[0024] Figure 10 is Figure 9 the F-F cross-sectional view in

[0025] Figure 11 is Figure 10 the G-G cross-sectional view in

[0026] Figure 12 Schematic diagram of the state where the charging gun is not aligned with the charging port;

[0027] Figure 13 Schematic diagram of the state of phase deviation between the charging gun and the charging port;

[0028] Figure 14 Schematic diagram of the state where the charging gun is about to be inserted into the charging port;

[0029] Figure 15 、 Figure 16 、 Figure 17 and Figure 18 indicate different relative positions of the charging gun relative to the charging port;

[0030] Figure 19 Schematic diagram of the charging port for another embodiment.

[0031] In the attached drawing reference numerals: 1, electric vehicle; 11, battery pack; 12, charging port I; 13, charging port II; 13a, AC charging port II; 13b, DC charging port II; 121, flange end; 122, first contact terminal; 123, second contact terminal; 124, position sensor; 125, flange end face; 2, charging gun; 21, coupling port; 22, end face; 3, cable; 4, charging device; 5, first magnet; 51, magnet a; 52, magnet b; 53, magnet c; 54, magnet d; 6, second magnet; 61, magnet e; 62, magnet f; 63, magnet g; 64, magnet h; 7, third magnet; 71, magnet i; 72, magnet j; 73, magnet k; 74, magnet l. Detailed implementation mode

[0032] The present invention will be further described in detail below in conjunction with the attached drawings and embodiments. The same parts are denoted by the same reference numerals. It should be noted that the terms "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to the directions in the attached drawings, and the terms "bottom" and "top", "inner" and "outer" refer to the directions towards or away from the geometric center of a specific component respectively.

[0033] As Figure 1 、 Figure 2 and Figure 3 , the present invention provides a technical solution: an electric vehicle charging connection mechanism and its control method, including an electric vehicle 1 and a charging device 4. The charging device 4 is connected with a charging gun 2 through a cable 3. The electric vehicle 1 is provided with a charging port I 12 and a charging port II 13 connected to the charging gun 2. A battery pack 11 is arranged inside the electric vehicle 1. The charging gun 2 charges the battery pack 11 through the charging port I 12. The charging port I 12 includes an AC charging port I and a DC charging port I. Multiple paired first contact terminals 122 and second contact terminals 123 are arranged on the flange end 121 of the charging port I 12. The charging gun 2 is coupled and connected with the first contact terminals 122 and the second contact terminals 123. A first magnet 5 is arranged inside the flange end 121, a second magnet 6 is arranged inside the base of the charging port I 12, and a third magnet 7 is arranged inside the coupling port 21 of the charging gun 2, so as to partially offset or reduce the insertion and extraction resistance of the charging gun 2 cooperating with the charging port I 12 through the attraction or repulsion force generated by a set magnetic field. A position sensor 124 is arranged inside the charging port I 12 to detect the position of the charging gun 2 inside the charging port I 12 and determine whether the charging gun 2 is in an inserted or extracted state through the change of the position.

[0034] The position sensor 124 can be an ultrasonic sensor. The position sensor 124 measures the position of the charging gun 2 through the time difference between the reflected ultrasonic wave and the ultrasonic wave reflected back by the gun head 23 of the charging gun 2 and determines whether the charging gun 2 is in an inserted or extracted state through the change state of the position.

[0035] The position sensor 124 can also optically measure the distance between the charging port Ⅰ12 and the charging gun 2 and the state of change of the distance, so as to identify the position of the charging gun 2 and the insertion / removal state.

[0036] Such as Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 14 , there are multiple layers of magnets distributed along the S axis on the charging port Ⅰ12. The first magnet 5 on the flange end 121 of the charging port Ⅰ12 is located on the outer layer of the charging port Ⅰ12. There is a magnet a51 above the left of the charging port Ⅰ12, the S pole of the magnet a51 faces the charging gun 2. There is a magnet b52 below the left of the charging port Ⅰ12, the N pole of the magnet b52 faces the charging gun 2. There is a magnet c53 below the right of the charging port Ⅰ12, the N pole of the magnet c53 faces the charging gun 2. There is a magnet d54 above the right of the charging port Ⅰ12, the S pole of the magnet d54 faces the charging gun 2. The offset angle a of the magnet a51 is the same as the offset angle H of the magnet e61. The offset angle b of the magnet b52 is the same as the offset angle K of the magnet f62. The offset angle c of the magnet c53 is the same as the offset angle M of the magnet g63. The offset angle d of the magnet d54 is the same as the offset angle N of the magnet h64. The charging gun 2 needs to be inserted to a certain depth along the axis S in the charging port Ⅰ12 to reach the set connection state, that is, the charging gun 2 is inserted from the flange end 121 of the charging port Ⅰ12 and successively receives the magnetic field forces of the first magnet 5 and the second magnet 6. As an improved scheme, the second magnet is an electromagnet, that is, the magnetic strength of the second magnet 6 can be adjusted by controlling the current change, and the polarity of the second magnet 6 can be adjusted by controlling the current direction.

[0037] There are multiple second magnets 6 distributed axially around the axis S on the inner layer of the charging port Ⅰ12 opposite to the outer layer. There is a magnet e61 above the left of the charging port Ⅰ12, the S pole of the magnet e61 faces the charging gun 2. There is a magnet f62 below the left of the charging port Ⅰ12, the N pole of the magnet f62 faces the charging gun 2. There is a magnet g63 below the right of the charging port Ⅰ12, the N pole of the magnet g63 faces the charging gun 2. There is a magnet h64 above the right of the charging port Ⅰ12, the S pole of the magnet h64 faces the charging gun 2.

[0038] Such as Figure 6 , Figure 7 , Figure 8 , Figure 9 , Figure 10 , Figure 11As shown, a third magnet 7 is provided inside the coupling port 21 of the charging gun 2. A plurality of third magnets 7 are circumferentially distributed around the axis V of the coupling port 21. The magnet i 71 is offset by an angle α4 along the axis V, the magnet j 72 is offset by an angle α3 along the axis V, the magnet k 73 is offset by an angle α2 along the axis V, and the magnet l 74 is offset by an angle α1 along the axis V; combined with Figure 12 Looking, a magnet i 71 is provided at the upper left of the charging gun 2, and the N pole of the magnet i 71 faces the charging port Ⅰ 12; a magnet j 72 is provided at the lower left of the charging gun 2, and the S pole of the magnet j 72 faces the charging port Ⅰ 12; a magnet k 73 is provided at the lower right of the charging gun 2, and the S pole of the magnet k 73 faces the charging port Ⅰ 12; a magnet l 74 is provided at the upper right of the charging gun 2, and the N pole of the magnet l 74 faces the charging port Ⅰ 12; when the charging gun 2 is inserted into the charging port Ⅰ 12, the axis S of the charging port Ⅰ 12 coincides / is coaxial with the axis V of the charging gun 2, and the coupling is completed when the end face 22 of the charging gun 2 reaches the flange end face 125 of the charging port Ⅰ 12. The offset angle α4 of the magnet i 71 is the same as the offset angle H of the magnet e 61, the offset angle α3 of the magnet j 72 is the same as the offset angle K of the magnet f 62, the offset angle α2 of the magnet k 73 is the same as the offset angle M of the magnet g 63, and the offset angle α1 of the magnet l 74 is the same as the offset angle N of the magnet h 64. That is, when the charging gun 2 is inserted into the charging port Ⅰ 12, the third magnets 7 are respectively radially aligned with the first magnets 5 and the second magnets 6.

[0039] The charging port Ⅰ 12 provided with the first magnet 5 and the charging gun 2 provided with the third magnet 7 attract each other.

[0040] There is a magnet i71 at the upper left of the charging gun 2, with the N pole of the magnet i71 facing the charging port Ⅰ12. There is a magnet j72 at the lower left of the charging gun 2, with the S pole of the magnet j72 facing the charging port Ⅰ12. There is a magnet k73 at the lower right of the charging gun 2, with the S pole of the magnet k73 facing the charging port Ⅰ12. There is a magnet l74 at the upper right of the charging gun 2, with the N pole of the magnet l74 facing the charging port Ⅰ12. When the charging gun 2 approaches the charging port Ⅰ12, the magnet a51 at the upper left of the charging port Ⅰ12 will attract the magnet i71 at the upper left of the charging gun 2, the magnet b52 at the lower left of the charging port Ⅰ12 will attract the magnet j72 at the lower left of the charging gun 2, the magnet c53 at the lower right of the charging port Ⅰ12 will attract the magnet k73 at the lower right of the charging gun 2, and the magnet d54 at the upper right of the charging port Ⅰ12 will attract the magnet l74 at the upper right of the charging gun 2. The resultant force of the attraction forces F1, F2, F3, and F4 between the first magnet 5 and the third magnet 7 drives the charging gun 2 to move along the path P1. It can be understood that the above effect is beneficial to guiding the charging gun 2 to automatically align with the charging port Ⅰ12. Even when the charging gun 2 is in a position of offset / angular tilt / phase deviation relative to the charging port Ⅰ12, the magnetic attraction force caused by the first magnet 5 provided at the charging port Ⅰ12 and the third magnet 7 provided at the charging gun 2 will guide the charging gun 2 to approach / fit the set position of the charging port Ⅰ12. Obviously, the above method can assist the charging gun 2 to automatically align with the charging port Ⅰ12 without relying on good line-of-sight conditions, which is especially beneficial for scenarios with poor lighting conditions. Magnetic force-assisted positioning is conducive to the charging gun 2 to successfully align and insert into the charging port Ⅰ12 under blind operation.

[0041] The magnet a51 attracts the magnet i71, the magnet b52 attracts the magnet j72, the magnet c53 attracts the magnet k73, and the magnet d54 attracts the magnet l74.

[0042] After the charging gun 2 is inserted into the charging port Ⅰ12, the end face 22 of the charging gun 2 reaches the flange end face 125 of the charging port Ⅰ12 to complete the coupling.

[0043] As Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 13 When the charging gun 2 approaches the charging port Ⅰ12, the attractive force of the magnetic field between the first magnet 5 and the third magnet 7 guides the upper left of the charging gun 2 to align with the upper left of the charging port Ⅰ12 and the lower right of the charging gun 2 to align with the lower right of the charging port Ⅰ12; As Figure 13, even if the initial posture of the handheld charging gun 2 deviates from the above correct alignment state, the deviation state may be that the charging gun 2 rotates by an angle β around the axis S or V. The magnet a51 has an attractive force F5 on the magnet i71, the magnet b52 has an attractive force F6 on the magnet j72, the magnet c53 has an attractive force F7 on the magnet k73, and the magnet d54 has an attractive force F8 on the magnet l74. The resultant force of the above attractive forces F5, F6, F7, and F8 drives the charging gun 2 to rotate by an angle β along the axis V according to the path P2. The attractive force of the magnetic field can guide the charging gun 2 to rotate a certain angle to the correct alignment state of the coupling port 21 of the charging gun 2 and the flange end 121 of the charging port Ⅰ12. The magnetic polarities of the magnets at the corresponding positions of the charging port Ⅰ12 and the charging gun 2 are opposite, and the attractive force of the magnetic field guides the charging gun 2 to approach the charging port Ⅰ12; the first magnets 5 in the circumferential direction of the charging port Ⅰ12 are arranged with different polarities, and the third magnets 7 in the circumferential direction of the charging gun 2 are arranged with different polarities, which is beneficial to correcting the position of the charging gun 2 when the charging gun 2 is inclined at an angle or has a phase deviation relative to the charging port Ⅰ12 and driving it to adjust to the correct spatial posture to match the charging port Ⅰ12.

[0044] As Figure 14 shown, the coupling port 21 of the charging gun 2 is about to be inserted into the charging port Ⅰ12. The magnet a51 exerts an attractive force F9 on the magnet i71, and the magnet c53 exerts an attractive force F10 on the magnet k73. In addition, the attractive forces of the magnet b52 on the magnet j72 and the magnet d54 on the magnet l74 are not shown. The magnet e61 exerts an attractive force F11 on the magnet i71, and the magnet g63 exerts an attractive force F12 on the magnet k73. In addition, the attractive forces of the magnet f62 on the magnet j72 and the magnet h64 on the magnet l74 are not shown. The resultant force of the above attractive forces provides an assisting effect for the charging gun 2 to move along the path P3, reducing the operating force required for the charging gun 2 to be inserted into the charging port Ⅰ12. The position sensor 124 detects the distance L1 of the charging gun 2 to identify the position of the charging gun 2. Then, the electric vehicle 1 adjusts the magnetic strength and magnetic field direction of the second magnet 6 according to the position of the charging gun 2, and further realizes applying an expected attractive force to the charging gun 2. It is easy to understand that when L1 becomes smaller over time, the charging gun 2 is in the inserted state, and when L1 changes over time, the charging gun 2 is in the pulled-out state. The position sensor 124 measures the distance L1 at a certain frequency and can sensitively detect the change of L1. For example, the measurement frequency of the position sensor 124 can be 100 Hz.

[0045] As Figure 15As shown, the coupling port 21 of the charging gun 2 is inserted into the charging port I 12. The magnet a 51 exerts a repulsive force F15 on the magnet i 71, and the magnet c 53 exerts a repulsive force F16 on the magnet k 73. In addition, the repulsive forces of the magnet b 52 on the magnet j 72 and the magnet d 54 on the magnet l 74 are not shown. The magnet e 61 exerts an attractive force F13 on the magnet i 71, and the magnet g 63 exerts an attractive force F14 on the magnet k 73. In addition, the attractive forces of the magnet f 62 on the magnet j 72 and the magnet h 64 on the magnet l 74 are not shown. The position sensor 124 detects the distance L2 of the charging gun 2 to identify the position and insertion / extraction state of the charging gun 2. Furthermore, the electric vehicle 1 adjusts the magnetic strength and magnetic field direction of the second magnet 6 according to the position of the charging gun 2, so as to exert an expected attractive or repulsive force on the charging gun 2. When the charging gun 2 is in the inserted state, the attractive force of the second magnet 6 on the third magnet 7 overcomes the repulsive force of the first magnet 5 on the third magnet 7, and the resultant force of the magnetic field forces provides a boosting effect for the charging gun 2 to move along the path P4. When it is identified that the charging gun 2 is in the extracted state, the attractive force of the second magnet 6 on the third magnet 7 is weaker than the repulsive force of the first magnet 5 on the third magnet 7, or the north and south poles of the second magnet 6 are controlled to be reversed to make the second magnet 6 exert a repulsive force on the third magnet 7, aiming to make the resultant force of the magnetic field forces provide a suitable boosting effect for the charging gun 2 to move in the direction opposite to the path P4.

[0046] As Figure 16 shown, as the charging gun 2 is further inserted into the charging port I 12, the third magnet 7 moves to a position centered and aligned with the first magnet 5, that is, the repulsive forces of the first magnet 5 on both ends of the third magnet 7 are balanced, and there is no attractive or repulsive force acting along the axis V direction; the magnet e 61 exerts an attractive force F17 on the magnet i 71, and the magnet g 63 exerts an attractive force F18 on the magnet k 73. In addition, the attractive forces of the magnet f 62 on the magnet j 72 and the magnet h 64 on the magnet l 74 are not shown. The position sensor 124 detects the distance L3 of the charging gun 2 to identify the position and insertion / extraction state of the charging gun 2. Furthermore, the electric vehicle 1 adjusts the magnetic strength and magnetic field direction of the second magnet 6 according to the position of the charging gun 2, so as to exert an expected attractive or repulsive force on the charging gun 2. When the charging gun 2 is in the inserted state, the attractive force of the second magnet 6 on the third magnet 7 provides a boosting effect for the charging gun 2 to move along the path P5, and the magnitude of the boost can be adjusted by controlling the current magnitude of the second magnet 6. When it is identified that the charging gun 2 is in the extracted state, the north and south poles of the second magnet 6 are controlled to be reversed (opposite to the Figure 16 polarity shown) to make the second magnet 6 exert a repulsive force on the third magnet 7, aiming to make the resultant force of the magnetic field forces provide a suitable boosting effect for the charging gun 2 to move in the direction opposite to the path P5, and the magnitude of the repulsive force of the second magnet 6 on the third magnet 7 can be adjusted by controlling the current magnitude of the second magnet 6.

[0047] AsFigure 17 As shown, the charging gun 2 is further inserted into the charging port I 12. The magnet a 51 exerts a repulsive force F21 on the magnet i 71, and the magnet c 53 exerts a repulsive force F22 on the magnet k 73. In addition, the repulsive forces of the magnet b 52 on the magnet j 72 and the magnet d 54 on the magnet l 74 are not shown. The magnet e 61 exerts an attractive force F19 on the magnet i 71, and the magnet g 63 exerts an attractive force F20 on the magnet k 73. In addition, the attractive forces of the magnet f 62 on the magnet j 72 and the magnet h 64 on the magnet l 74 are not shown. The position sensor 124 detects the distance L4 of the charging gun 2 to identify the position and insertion / removal state of the charging gun 2. Furthermore, the electric vehicle 1 adjusts the magnetic strength and magnetic field direction of the second magnet 6 according to the position of the charging gun 2, so as to apply an expected attractive or repulsive force to the charging gun 2. In the illustrated state, the charging gun 2 is in the inserted state. The combined action of the attractive force of the second magnet 6 on the third magnet 7 and the repulsive force of the first magnet 5 on the third magnet 7 provides a boosting effect for the charging gun 2 to move along the path P6, and the magnitude of the boost can be adjusted by controlling the current magnitude of the second magnet 6. When it is identified that the charging gun 2 is in the removed state, the north and south poles of the second magnet 6 are controlled to be reversed (opposite to the Figure 17 polarity shown) to achieve that the second magnet 6 exerts a repulsive force on the third magnet 7. The purpose is that the repulsive force of the second magnet 6 on the third magnet 7 overcomes / cancels the combined force of the repulsive force of the first magnet 5 on the third magnet 7 and the magnetic field acting force, and provides a suitable boosting effect for the charging gun 2 to move in the direction opposite to the path P5. Moreover, the magnitude of the repulsive force of the second magnet 6 on the third magnet 7 can be adjusted by controlling the current magnitude of the second magnet 6.

[0048] As Figure 18 shown, the charging gun 2 is further inserted into the charging port I 12 until the end face 22 of the charging gun 2 reaches the flange end face 125 of the charging port I 12 to complete the coupling. The charging gun 2 can be maintained at the coupling position by controlling the coil current of the second magnet 6 to be zero, that is, the second magnet 6 is in a non-magnetic state. When the position sensor 124 detects that the charging gun 2 is in the removed state, the north and south poles of the second magnet 6 are controlled to be reversed (opposite to the Figure 18 polarity shown) to achieve that the second magnet 6 exerts a repulsive force on the third magnet 7. The purpose is that the combined force of the repulsive force of the second magnet 6 on the third magnet 7 and the attractive force of the first magnet 5 on the third magnet 7 provides a suitable boosting effect for the charging gun 2 to be pulled out from the charging port I 12. Moreover, the magnitude of the repulsive force of the second magnet 6 on the third magnet 7 can be adjusted by controlling the current magnitude of the second magnet 6.

[0049] As Figure 19, as another implementation, the AC / DC combined charging port II 13 can arrange magnets in the AC charging port II 13a area in the first state, and arrange magnets in the DC charging port II 13b area in the second state that is different from the first state; the magnet polarity set on the AC charging gun is opposite to the magnet polarity in the first state, that is, the AC charging gun is arranged to be magnetically attracted to the AC charging port II 13a; the magnet polarity set on the DC charging gun is opposite to the magnet polarity in the second state, that is, the DC charging gun is arranged to be magnetically attracted to the DC charging port II 13b; when holding the AC charging gun close to the AC charging port II 13a, it will be guided by magnetic attraction to align with the AC charging port II 13a. Conversely, when holding the AC charging gun close to the DC charging port II 13b, an obvious magnetic repulsive force will be received; when holding the DC charging gun close to the DC charging port II 13b, it will be guided by magnetic attraction to align with the DC charging port II 13b. Conversely, when holding the DC charging gun close to the AC charging port II 13a, an obvious magnetic repulsive force will be received; thus, in a scenario with poor lighting conditions or for users who are not familiar with the structural differences between the AC charging port II 13a and the DC charging port II 13b, there is no need to spend extra time observing, matching the charging interface, and aligning the charging gun.

[0050] It is known that the magnetic force between two magnets with constant magnetic strength changes non-linearly with the distance between the two magnets. When one or both of the two magnets have variable magnetic strength, the magnetic force between the two magnets can be controlled by adjusting the magnetic strength as the distance between the two magnets changes. The first magnet 5 and the second magnet 6 work together. The electric vehicle 1 adjusts the polarity and magnetic strength of the second magnet 6 according to the different positions and insertion / removal states of the charging gun 2 in the charging port Ⅰ 12. The achieved effect is that when the charging gun 2 is inserted into the charging port Ⅰ 12, the direction of the auxiliary magnetic force is the insertion direction of the charging gun. For example, the mechanical friction resistance between the AC charging gun and the AC charging port is 100 N. If the magnetic field attraction force of the AC charging port on the AC charging gun during the insertion process of the AC charging gun into the AC charging port is 60 N, then only 40 N of force needs to be applied to the AC charging gun to smoothly insert it into the AC charging port. And thanks to the real-time adjustment of the magnetic strength of the second magnet according to the position of the charging gun, the operating force during the insertion process of the charging gun is stable and does not change sharply. When the charging gun is pulled out from the electric vehicle charging port, the direction of the auxiliary magnetic force is the pulling-out direction of the charging gun. For example, the mechanical friction resistance between the AC charging gun and the AC charging port is 100 N. If the magnetic field repulsion force of the AC charging port on the AC charging gun during the pulling-out process of the AC charging gun from the AC charging port is 60 N, then only 40 N of force needs to be applied to the AC charging gun to smoothly pull it out from the AC charging port. And thanks to the real-time adjustment of the magnetic strength of the second magnet according to the position of the charging gun, the operating force during the pulling-out process of the charging gun is stable and does not change sharply. The second magnet 6 can be constructed as an electromagnet. The magnetic strength of the second magnet 6 can be changed by controlling the magnitude of the current, and the polarity of the second magnet 6 can be adjusted by controlling the direction of the current. The specific adjustment schemes of the magnitude and direction of the above current with respect to the position and movement direction of the charging gun 2 can be obtained through experiments or calibration methods. Further, the electric vehicle 1 adjusts the magnetic strength and magnetic field direction of the second magnet 6 according to a preset program, thereby reducing the operating force during the insertion / removal process of the charging gun 2 and maintaining the stability of the above operating force.

[0051] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. Electric vehicle charging connection mechanism, Characterized in that: It includes an electric vehicle (1) and a charging device (4). The charging device (4) is connected with a charging gun (2) through a cable (3). A charging port I (12) and a charging port II (13) connected to the charging gun (2) are provided on the electric vehicle (1). A battery pack (11) is provided inside the electric vehicle (1). The charging gun (2) charges the battery pack (11) through the charging port I (12). A plurality of paired first contact terminals (122) and second contact terminals (123) are provided on the flange end (121) of the charging port I (12). The charging gun (2) is coupled and connected to the first contact terminals (122) and the second contact terminals (123). A first magnet (5) is built into the flange end (121). A second magnet (6) is built into the base of the charging port I (12). A third magnet (7) is built into the coupling port (21) of the charging gun (2). A position sensor (124) is provided inside the charging port I (12). The charging port I (12) provided with the first magnet (5) and the charging gun (2) provided with the third magnet (7) attract each other. The second magnet (6) is configured as an electromagnet. The magnetic strength of the second magnet (6) can be changed by controlling the magnitude of the current, and the polarity of the second magnet (6) is adjusted by controlling the direction of the current. The magnetic strength of the second magnet (6) is adjusted in real time according to the position of the charging gun, so that the operating force during the process of pulling out the charging gun (2) is stable and does not change sharply. The electric vehicle adjusts the magnetic strength and magnetic field direction of the second magnet (6) according to a preset program.

2. The electric vehicle charging connection mechanism according to claim 1, Characterized in that: The first magnet (5) on the flange end (121) of the charging port I (12) is located on the outer layer of the charging port I (12). A magnet a (51) is provided in the upper left of the charging port I (12). The S pole of the magnet a (51) faces the charging gun (2). A magnet b (52) is provided in the lower left of the charging port I (12). The N pole of the magnet b (52) faces the charging gun (2). A magnet c (53) is provided in the lower right of the charging port I (12). The N pole of the magnet c (53) faces the charging gun (2). A magnet d (54) is provided in the upper right of the charging port I (12). The S pole of the magnet d (54) faces the charging gun (2).

3. The electric vehicle charging connection mechanism according to claim 1, Characterized in that: The second magnet (6) on the flange end (121) of the charging port Ⅰ (12) is located inside the charging port Ⅰ (12). There is a magnet e (61) at the upper left of the charging port Ⅰ (12), with the S pole of the magnet e (61) facing the charging gun (2). There is a magnet f (62) at the lower left of the charging port Ⅰ (12), with the N pole of the magnet f (62) facing the charging gun (2). There is a magnet g (63) at the lower right of the charging port Ⅰ (12), with the N pole of the magnet g (63) facing the charging gun (2). There is a magnet h (64) at the upper right of the charging port Ⅰ (12), with the S pole of the magnet h (64) facing the charging gun (2).

4. The electric vehicle charging connection mechanism according to claim 1, characterized in that: There is a magnet i (71) at the upper left of the charging gun (2), with the N pole of the magnet i (71) facing the charging port Ⅰ (12). There is a magnet j (72) at the lower left of the charging gun (2), with the S pole of the magnet j (72) facing the charging port Ⅰ (12). There is a magnet k (73) at the lower right of the charging gun (2), with the S pole of the magnet k (73) facing the charging port Ⅰ (12). There is a magnet l (74) at the upper right of the charging gun (2), with the N pole of the magnet l (74) facing the charging port Ⅰ (12).

5. The control method of the electric vehicle charging connection mechanism, using the electric vehicle charging connection mechanism according to any one of claims 1-4, characterized in that: After the charging gun (2) is inserted into the charging port Ⅰ (12), the end face (22) of the charging gun (2) reaches the flange end face (125) of the charging port Ⅰ (12) to complete the coupling.

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