Magnetic-attraction charging structure for battery of electric motorcycle

Abstract

A magnetic-attraction charging structure for a battery of an electric motorcycle. Magnetic attraction members are respectively arranged around charging input contacts on a battery and around charging output contacts on a charging connector. During charging, when a charging output surface of the charging connector approaches a charging input surface, the charging connector can automatically approach the charging input surface under the action of a magnetic force between a first magnetic attraction member and a second magnetic attraction member, and is finally attached to the battery, so that the charging output contacts are connected to the charging input contacts. Compared with existing plug-in charging structures, the charging connector and a charging port can be docked without the need for force, which is labor-saving. Moreover, the docking between the charging connector and the charging port mainly relies on the action of a magnetic force, rather than plug-in fitted surfaces, thereby avoiding the situations of loose fit and poor charging contact caused by wear. Therefore, the problems of existing charging structures for electric motorcycles being laborious to plug in and inconvenient to use can be effectively solved, thereby achieving the effects of reducing the difficulty of charging operations and improving the user experience.

Description

Electric motorcycle battery magnetic attraction charging structure TECHNICAL FIELD

[0001] The utility model belongs to the technical field of battery charging, and specifically relates to an electric motorcycle battery magnetic attraction charging structure. BACKGROUND

[0002] To promote energy saving and emission reduction and environmental protection, present each big city has begun advocating the use of electric vehicles, such as electric buses, electric vehicles and electric motorcycles, and electric motorcycles are one of the most convenient electric vehicles for personal travel. For the convenience of charging, such as the storage box configuration structure of the electric motorcycle disclosed in Chinese patent CN102039959B, the battery of the electric motorcycle is vertically inserted into the battery box on the vehicle body, and the charging interface is arranged on the top of the battery. When charging, the cover plate or the cushion shielding the battery box is turned over, the battery is taken out or directly connected to the charging connector for charging.

[0003] At present, the battery charging structure of the electric motorcycle on the market mostly adopts a three-column plug-in interface in the shape of a triangle, such as the electric vehicle battery box charging interface disclosed in Chinese patent CN202601950U and the improved electric vehicle charging interface structure disclosed in CN106099494A. The charging connector of the triangular charging interface has only one correct insertion direction, which is more troublesome to use. The charging connector of the charging interface disclosed in Chinese patent CN206163792U is symmetrically arranged in the center of the charging interface, so that the charging connector can be inserted in both directions. This reduces the difficulty of use, but when charging, the charging connector still needs to be directly inserted into the charging interface and connected with force. Not only is it laborious, but it is also easy to cause the plug-in connection to loosen and the charging contact to be poor due to wear and tear. In addition, when charging, the charging interface or the charging connector is easily damaged if the vehicle body or the battery moves accidentally, and the reliability is poor.

[0004] SUMMARY

[0005] In view of the above shortcomings of the prior art, the utility model aims to provide an electric motorcycle battery magnetic attraction charging structure to solve the technical problems of laborious plug-in connection and inconvenience in use of the current electric motorcycle charging structure, and to achieve the effects of reducing the difficulty of charging operation and improving user experience.

[0006] To solve the above technical problems, the utility model adopts the following technical scheme:

[0007] The application discloses a magnetic charging structure for an electric motorcycle battery, comprising a battery and a charging connector, wherein the battery is provided with a charging input surface on the outer wall thereof, the charging input surface is provided with charging input contacts, and a first magnetic attraction element is arranged on the surface or inside of the outer wall of the battery and close to the charging input contacts; the charging connector is provided with a charging output surface, the charging output surface is provided with charging output contacts matched with the charging input contacts, and a second magnetic attraction element is arranged on the surface or inside of the charging connector and close to the charging output contacts; both the first magnetic attraction element and the second magnetic attraction element have magnetism and at least one of them is a magnet; the charging connector can be attracted to the battery under the magnetic force of the first magnetic attraction element and the second magnetic attraction element and keep the charging output contacts in contact with the charging input contacts.

[0008] Further, the charging input surface is a concave surface, and the charging output surface is a convex surface matched with the charging input surface; or the charging input surface is a convex surface, and the charging output surface is a concave surface matched with the charging input surface.

[0009] Further, the charging input surface is a concave surface, and the charging output surface is a convex surface matched with the charging input surface; or the charging input surface is a convex surface, and the charging output surface is a concave surface matched with the charging input surface.

[0010] Further, the charging input contacts are centrally symmetrically distributed, and the charging output contacts are matched with the distribution of the charging input contacts.

[0011] Further, the outer wall of the battery is provided with a rubber cover plate covering the charging input surface and capable of being lifted, the rubber cover plate is embedded with a third magnetic attraction element having magnetism, at least one of the third magnetic attraction element and the first magnetic attraction element is a magnet, and the inner surface of the rubber cover plate can be kept in sealing abutment with the top surface of the convex platform under the magnetic force of the third magnetic attraction element and the first magnetic attraction element.

[0012] Further, one side of the rubber cover plate is provided with a connecting plate extending on the outer wall of the battery, the connecting plate is connected to the outer wall of the battery through a screw penetrating therethrough, the connecting plate is provided with a connecting part in a wedge shape and easy to be bent between the rubber cover plate and the screw, and the connecting plate is folded at the connecting part when the rubber cover plate is lifted, so that the rubber cover plate can be reversely connected to the outer wall of the battery.

[0013] Further, the outer wall of the battery has a water guide groove, the bottom of the water guide groove has a boss lower than the surface of the outer wall of the battery, the bottom surface of the water guide groove and the top surface of the boss form the charging input surface, and the charging input contact is located on the top surface of the boss; the boss is spaced from the side wall of the water guide groove and forms a water drainage groove around the boss, the water drainage groove has a water leakage hole or a water leakage gap to drain the water entering the water guide groove to prevent water; the charging output surface has a groove matched with the boss, and the charging output contact is located on the bottom surface of the groove.

[0014] Further, the boss is a mounting block embedded in the bottom of the water guide groove and has no magnetism, and the first magnetic attraction member is embedded in the inside of the mounting block.

[0015] Further, the outer contour of the charging input surface and the charging output surface and / or the outer contour of the boss and the groove are rectangular.

[0016] Further, the charging output surface is provided with a mounting hole, the mounting hole is provided with an elastic contact pin, and the outer end of the elastic contact pin extends out of the charging output surface to form the charging output contact.

[0017] Compared with the prior art, the utility model has the following beneficial effects:

[0018] 1. Compared with the current plug-in charging structure, the utility model not only does not need to force the charging connector to be connected with the charging interface, but also is more labor-saving, and the charging connector and the charging interface are mainly connected by magnetic force, instead of the surface of plug-in cooperation, so that the cooperation loosening and poor charging contact caused by abrasion do not occur; the problems of labor-saving and inconvenient use of the current electric motorcycle charging structure can be effectively solved, the difficulty of charging operation is reduced, and the user experience is improved; if the motorcycle is accidentally dropped during the charging process, the charging connector and the charging interface are more easily separated, and damage is avoided; in addition, the size of the magnetic force and the charging connector can be adjusted according to the corresponding requirements, so that the utility model is suitable for more electric vehicles, is beneficial to promote the use of electric vehicles, and promotes energy saving, emission reduction and environmental protection.

[0019] 2. The electric motorcycle battery magnetic attraction charging structure disclosed by the utility model designs the charging input surface and the charging output surface as shallow concave surfaces and convex surfaces respectively, and makes the first magnetic attraction member and the second magnetic attraction member annular or circumferentially distributed; during charging, the charging connector only needs to be held, the charging output surface is close to the charging input surface at a close distance, or is attached to the battery outer wall close to the charging input surface, and then the charging connector can be released, the charging connector is automatically attracted to the original position under the action of the magnetic force, the charging output contact is in contact with the charging input contact, and the connection between the charging connector and the charging interface does not need to be guaranteed to be completely opposite, the difficulty of charging operation can be effectively reduced, especially in the case of dim light, and the user experience is improved.

[0020] 3, The utility model discloses electric motor car battery magnetic attraction charging structure sets up rubber cover plate for covering protection charging interface, and rubber cover plate also adopts magnetic force adsorption, in addition, rubber cover plate can overturn the connection on the battery through the connecting portion, and when charging, the rubber cover plate is opened to the butt joint charging connector, and after moving out the charging connector, the rubber cover plate will turn over to the charging interface under the self elastic force and is adsorbed tightly under the magnetic force, and manual operation is not needed to cover tightly, make charging operation more simple, and it is favorable to the improvement of the use experience. BRIEF DESCRIPTION OF DRAWINGS

[0021] Fig. 1 is a schematic diagram of the battery and the charging interface thereon according to the embodiment

[0022] Fig. 2 is a schematic diagram of the charging output surface of the charging connector according to the embodiment;

[0023] Fig. 3 is a partial sectional view of Fig. 1 along A-A;

[0024] Fig. 4 is a schematic diagram of the overall electric motor car battery magnetic attraction charging structure according to the embodiment;

[0025] Among them, the battery 1, the charging connector 2, the charging input contact 3, the first magnetic attraction piece 4, the charging output contact 5, the rubber cover plate 6, the connecting plate 7, the screw 8, the connecting portion 9, the water guide groove 10, the boss 11, the water drainage groove 12, the water leakage gap 13, the groove 14, the elastic contact pin 15, the strip-shaped groove 16, and the threaded hole 17. DETAILED DESCRIPTION

[0026] To make the purpose, technical scheme and advantages of the utility model embodiment clearer, the technical scheme in the utility model embodiment will be described clearly and completely below in combination with the drawings in the utility model embodiment.

[0027] Embodiment:

[0028] Please refer to Fig. 1 and Fig. 2, an electric motor car battery magnetic attraction charging structure, comprising a battery 1 and a charging connector 2, the battery 1 has a charging input face on the outer wall, the charging input face has a charging input contact 3, the battery 1 has a first magnetic attraction piece 4 on the outer wall surface or inside close to the charging input contact 3; the charging connector 2 has a charging output face, the charging output face has a charging output contact 5 matched with the charging input contact 3, the charging connector 2 has a second magnetic attraction piece (not shown in the figure) on the surface or inside close to the charging output contact 5; the first magnetic attraction piece 4 and the second magnetic attraction piece both have magnetism and at least one is a magnet, the charging connector 2 can be adsorbed on the battery 1 under the magnetic force of the first magnetic attraction piece 4 and the second magnetic attraction piece, and keep the charging output contact 5 in contact with the charging input contact 3;

[0029] The charging input contact 3 and the charging input surface jointly form a charging interface corresponding to the charging connector 2, and the charging input contact 3 is electrically connected with the battery cell inside the battery 1; when the first magnetic attraction member 4 is a magnet (such as a magnet, a permanent magnet or an electromagnet), the second magnetic attraction member can be a magnet or a magnetic metal (such as an iron sheet); when the second magnetic attraction member is a magnet, the first magnetic attraction member 4 can be a magnet or a magnetic metal (it can be understood that when the second magnetic attraction member is a magnet, the part of the outer wall of the battery with the charging point interface should be made of a non-magnetic material to avoid the charging connector 2 being magnetically attracted to the outer wall of the battery); when both the first magnetic attraction member 4 and the second magnetic attraction member are magnets, the magnetic polarity of the outward-facing surface of the first magnetic attraction member 4 should be opposite to the magnetic polarity of the outward-facing surface of the second magnetic attraction member; in addition, the magnetic force of the first magnetic attraction member 4 and the second magnetic attraction member should not be too large to make the charging connector 2 easy to be pulled out after the charging is completed.

[0030] The electric motorcycle battery magnetic attraction charging structure disclosed by the utility model sets magnetic attraction members around the charging input contact 3 on the battery 1 and around the charging output contact 5 on the charging connector 2 respectively; when charging, after the charging output surface of the charging connector 2 is directed to the charging input surface, the charging connector 2 can be automatically attracted to the charging input surface under the magnetic force of the first magnetic attraction member 4 and the second magnetic attraction member, and finally be attracted to the battery 1, so that the charging output contact 5 and the charging input contact 3 are in conduction, and the battery 1 can be charged by connecting the charging connector 2 with the power grid; when implemented, the magnet is preferably a permanent magnet, and if necessary, it can also be an electromagnet; before the charging connection is needed, the electromagnet is powered and magnetized, and the subsequent docking has the same use effect.

[0031] Compared with the current plug-in charging structure, the utility model not only does not need to force the charging connector 2 to be connected with the charging interface, but also is more labor-saving; the connection of the charging connector 2 with the charging interface mainly depends on the magnetic force, rather than the surface of the plug-in connection, so the problem of loose connection and poor charging contact caused by wear will not occur; the utility model can effectively solve the problems of labor-consuming plug-in and inconvenient use of the current electric motorcycle charging structure, and has the effects of reducing the difficulty of charging operation and improving the user experience.

[0032] Please refer to FIG. 2 and FIG. 3, in order to avoid the misalignment of the charging output contact 5 and the charging input contact 3 when the charging connector 2 is attracted to the battery 1, which leads to the failure of normal charging; the charging input surface is designed as a concave surface, and the charging output surface is a convex surface matched with the charging input surface; or the charging input surface is designed as a convex surface, and the charging output surface is a concave surface matched with the charging input surface; in this way, the positioning is realized by the concave-convex matching of the charging input surface and the charging output surface when the connection is made, so that the charging output contact 5 can be in direct contact and conduction with the charging input contact 3 after the connection is made.

[0033] Please see Figure 2 and Figure 3, in this embodiment, the charging input surface is designed as a concave surface, the charging output surface is a convex surface matched with the charging input surface, the outer wall of the battery 1 where the charging input surface is located has no magnetism; the first magnetic attraction member 4 is arranged inside the outer wall of the battery 1, and the second magnetic attraction member is arranged inside the charging connector 2; the first magnetic attraction member 4 is in a ring structure surrounding the charging input contact 3, and the second magnetic attraction member is in a ring structure surrounding the charging output contact 5; or the first magnetic attraction member 4 is multiple and evenly distributed in the circumferential direction around the charging input contact 3, and the second magnetic attraction member is multiple and evenly distributed in the circumferential direction around the charging output contact 5;

[0034] In this way, since the first magnetic attraction member 4 and the second magnetic attraction member are in a ring shape or evenly distributed in the circumferential direction, when the charging output surface is completely opposite to the charging input surface, the first magnetic attraction member 4 and the second magnetic attraction member are also completely opposite, which is the most stable state. Since the charging input surface is concave, the charging connector 2 is close to or attached to the surface of the outer wall of the battery 1, and its movement is not blocked. When charging, when the charging connector 2 is close to the battery 1 and the charging output surface is not completely opposite to the charging input surface, the two are close to each other, so that the magnetic force reaches a certain strength, the charging connector 2 will be attracted and moved by the magnetic force, and automatically corrected, so that the charging output surface is opposite to the charging input surface, and finally adsorbed together to realize the contact and conduction of the charging output contact 5 and the charging input contact 3.

[0035] Understandably, when charging, the charging connector 2 can be released after being held close to the charging input surface or attached to the charging input surface of the battery 1, and the charging connector 2 will be automatically adsorbed and returned to the original position under the action of the magnetic force, so that the charging output contact 5 and the charging input contact 3 are in contact and conduction. When connecting the charging connector 2 with the charging interface, it is not necessary to ensure that the two are completely opposite, which can effectively reduce the difficulty of charging operation, especially in the case of dim light, which is conducive to improving the user experience.

[0036] Please see Figure 2 and Figure 3, the charging input contact 3 has multiple and is centrally symmetrically distributed, and the charging output contact 5 has multiple and is matched with the distribution of the charging input contact 3; in this way, the charging connector 2 can be connected to the charging interface in both positive and negative directions, which is conducive to reducing the difficulty of use. When multiple contacts have connection sequence requirements, the orientation uniqueness of magnetic attraction connection can be limited by necessary matching of the convex and concave shapes.

[0037] Please see Figure 4, the outer wall of the battery 1 is provided with a rubber cover plate 6 covering the charging input surface and can be lifted, the rubber cover plate 6 is embedded with a third magnetic member (not shown in the figure) with magnetism, and the third magnetic member and the first magnetic member 4 are both magnets, and the inner side of the rubber cover plate 6 can be kept in sealing contact with the top surface of the boss 11 under the magnetic force of the third magnetic member and the first magnetic member 4; in this way, the rubber cover plate 6 is provided to cover and protect the charging interface, and the rubber cover plate 6 is also attracted by magnetic force, which can avoid the situation of loose cooperation or even failure due to wear after a long time.

[0038] Please see Figure 4, one side of the rubber cover plate 6 has a connecting plate 7 extending on the outer wall of the battery 1, the connecting plate 7 is connected to the outer wall of the battery 1 by a screw 8 penetrating through, and the connecting plate 7 has a wedge-shaped and easily bent connecting part 9 between the rubber cover plate 6 and the screw 8, and the connecting plate 7 is folded at the connecting part 9 when the rubber cover plate 6 is lifted; in this embodiment, a strip-shaped groove 16 is also provided on the outer wall of the battery 1 and communicates with the water guide groove 10, so as to accommodate the connecting plate 7, so that the rubber cover plate 6 and the connecting plate 7 are embedded in the outer wall of the battery 1, which is more beautiful, and the strip-shaped groove 16 is provided with a threaded hole 17 for connecting the screw 8; in this way, the rubber cover plate 6 can be connected to the outer wall of the battery 1 by turning over, and the charging connector 2 is connected to the charging interface when the rubber cover plate 6 is lifted, and the rubber cover plate 6 is turned over towards the charging interface under the elastic force of itself and is attracted tightly under the magnetic force after the charging connector 2 is removed, without the need for manual operation, which makes the charging operation more simple and is conducive to improving the user experience.

[0039] Please see Figure 1 and Figure 3, the outer wall of the battery 1 has a water guide groove 10, the bottom of the water guide groove 10 has a boss 11 lower than the surface of the outer wall of the battery 1, the bottom surface of the water guide groove 10 and the top surface of the boss 11 form the charging input surface, and the charging input contact 3 is located on the top surface of the boss 11; the boss 11 has a spacing with the side wall of the water guide groove 10 and forms a drainage groove 12 around the boss 11, and the drainage groove 12 has a water leakage hole or a water leakage gap 13 to drain the water entering the water guide groove 10 for waterproofing; the charging output surface has a groove 14 matched with the boss 11, and the charging output contact 5 is located on the bottom surface of the groove 14; in this way, when water passes through and enters the water guide groove 10 at the charging interface, it will flow along the drainage groove 12 and be drained through the water leakage hole or the water leakage gap 13 in time, and the charging input contact 3 is located on the top surface of the boss 11 which is higher than the drainage groove 12, so as to avoid the short circuit or corrosion caused by water contact; in this embodiment, the boss 11 has two levels respectively in the shape of a circle and a square, and the groove 14 is correspondingly matched therewith.

[0040] Please see Figure 3, in this embodiment, in order to facilitate production and assembly, the boss 11 is designed as a mounting block embedded in the bottom of the water guide groove 10 and has no magnetism, and the first magnetic member 4 is embedded in the mounting block.

[0041] Please refer to Fig. 1 and Fig. 2, in order to avoid the charging connector 2 adsorbed after docking at the charging interface, affected by the wire swing connected with the charging connector 2 or other small external force, causing the charging connector 2 to deflect relative to the charging interface, causing the charging output contact 5 to deviate and disconnect with the charging output contact 5, the outer contour of the charging input surface and the charging output surface or / and the outer contour of the boss 11 and the groove 14 is rectangular; in this way, the charging connector 2 will not be randomly deflected after being adsorbed, which is beneficial to improve the reliability of the charging output contact 5 and the charging output contact 5 contact conduction, and ensure the smooth charging.

[0042] Please refer to Fig. 3, in the embodiment, the charging output surface and the charging input surface are respectively provided with mounting holes, and the mounting holes are provided with elastic contact pins 15, the outer end of the elastic contact pin 15 located on the charging connector 2 extends out of the charging output surface to form the charging output contact 5, and the outer end of the elastic contact pin 15 located at the charging interface is below the charging input surface to form the charging input contact 3, when the charging connector 2 is adsorbed and docked on the charging interface, the part of the elastic contact pin 15 on the charging connector 2 extending out of the charging output surface falls into the corresponding mounting hole at the charging interface, and the outer end of the elastic contact pin 15 in the charging interface abuts, so that the charging connector 2 is electrically connected with the charging interface, and each two elastic contact pins 15 abutting each other are in a compressed state, so as to ensure the stability of the abutting conduction, and enable the charging to be carried out smoothly. When implementing, the elastic contact pin 15 on the charging connector 2 has the telescopic property, and the contact pin at the charging interface can also be in a fixed form, and vice versa.

[0043] When implementing, the other end of the charging connector 2 is connected with the energy storage device, and the energy storage device and the charging connector 2 can be vehicle-mounted; or can be separated from the vehicle, and when needed, the energy storage device is hung on the vehicle body, such as the handle of a motorcycle, and the charging connector 2 is magnetically adsorbed on the battery 1 to charge and ride.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit the technical solutions, and those skilled in the art should understand that those who modify or equivalently replace the technical solutions of the present application without departing from the purpose and scope of the present application should be covered in the scope of the claims of the present application.

Claims

1. A magnetic charging structure for an electric motorcycle battery, characterized in that: The device includes a rechargeable and detachable battery and a charging connector. The battery has a charging input surface on its outer wall, with charging input contacts on the charging input surface. A first magnetic element is provided on the outer surface or inside of the battery near the charging input contacts. The charging connector has a charging output surface, with charging output contacts adapted to the charging input contacts. A second magnetic element is provided on the surface or inside of the charging connector near the charging output contacts. Both the first and second magnetic elements are magnetic, and at least one is a magnet. The charging connector can be attracted to the battery under the magnetic force of the first and second magnetic elements, maintaining contact and conduction between the charging output contacts and the charging input contacts.

2. The magnetic charging structure for an electric motorcycle battery according to claim 1, characterized in that: The charging input surface is concave, and the charging output surface is a convex surface that matches the charging input surface; or the charging input surface is convex, and the charging output surface is a concave surface that matches the charging input surface.

3. The magnetic charging structure for an electric motorcycle battery according to claim 1, characterized in that: The charging input surface is concave, and the charging output surface is a convex surface that matches the charging input surface. The outer wall of the battery where the charging input surface is located is non-magnetic. The first magnetic chuck is located inside the outer wall of the battery, and the second magnetic chuck is located inside the charging connector. The first magnetic attractor has a ring-shaped structure around the charging input contact, and the second magnetic attractor has a ring-shaped structure around the charging output contact; or there are multiple first magnetic attractors evenly distributed around the charging input contact, and multiple second magnetic attractors evenly distributed around the charging output contact.

4. The magnetic charging structure for an electric motorcycle battery according to claim 3, characterized in that: There are multiple charging input contacts that are centrally symmetrically distributed, and multiple charging output contacts that are adapted to the distribution of the charging input contacts.

5. The magnetic charging structure for an electric motorcycle battery according to claim 3, characterized in that: The outer wall of the battery has a recessed water guide groove, and the bottom of the water guide groove has a protrusion that is lower than the surface of the outer wall of the battery. The bottom surface of the water guide groove and the top surface of the protrusion form the charging input surface, and the charging input contact is located on the top surface of the protrusion. There is a gap between the protrusion and the side wall of the water guide groove, which forms a drainage groove around the protrusion. The drainage groove has a water leakage hole or water leakage gap to drain the water that enters the water guide groove and play a waterproof role. The charging output surface has a groove that matches the protrusion, and the charging output contact is located on the bottom surface of the groove.

6. The magnetic charging structure for an electric motorcycle battery according to claim 5, characterized in that: The outer wall of the battery is provided with a rubber cover that covers the charging input surface and can be lifted. The rubber cover is embedded with a third magnetic element, and at least one of the third magnetic element and the first magnetic element is a magnet. The inward side of the rubber cover can be kept in sealed contact with the top surface of the boss under the magnetic force of the third magnetic element and the first magnetic element.

7. The magnetic charging structure for an electric motorcycle battery according to claim 6, characterized in that: The rubber cover has a connecting plate extending on the outer wall of the battery. The connecting plate is connected to the outer wall of the battery by a through screw. The connecting plate has a wedge-shaped, easily bendable connecting part between the rubber cover and the screw. When the rubber cover is lifted, the connecting plate folds at the connecting part.

8. The magnetic charging structure for an electric motorcycle battery according to claim 5, characterized in that: The boss is a non-magnetic mounting block embedded in the bottom of the water guide channel, and the first magnetic element is embedded inside the mounting block.

9. The magnetic charging structure for an electric motorcycle battery according to claim 5, characterized in that: The outer contours of the charging input surface and the charging output surface, and / or the outer contours of the boss and the groove, are rectangular.

10. The magnetic charging structure for an electric motorcycle battery according to claim 1, characterized in that: A mounting hole is provided on the charging output surface, and an elastic contact pin is provided in the mounting hole. The outer end of the elastic contact pin extends out of the charging output surface to form the charging output contact.

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