A connection structure of a charging interface and a charging plug

Abstract

The application relates to the technical field of chargers, in particular to a connecting structure of a charging interface and a charging plug. The application comprises a charging plug, a charging interface, a wire, a sliding groove, a pushing block, a power cavity, a first elastic air bag, a limiting groove and a limiting assembly; when the charging plug is combined with the charging interface, the pushing block compresses the space of the sliding groove, gas in the sliding groove and the power cavity flows into the first elastic air bag, the first elastic air bag is driven to expand, the first elastic air bag is embedded in the limiting groove, the combination force between the charging plug and the charging interface is increased, and the problems that the charging interface and the charging plug are prone to loosening and falling off are reduced.

Description

Technical Field

[0001] This application relates to the technical field of chargers, and in particular to a connection structure between a charging interface and a charging plug. Background Technology

[0002] Currently, electric vehicles have become the main mode of transportation for people. Powered by electricity, they bring convenience to people's lives while reducing the consumption of petroleum resources and mitigating air pollution. Electric vehicles are powered by batteries and charged by their own chargers.

[0003] Currently, electric vehicle charging ports connect to the battery, and one end of the charger plugs into the charging port while the other end connects to the power source, allowing current to flow from the charger to the battery. Because the charging port and plug are only interlocked, the connection between them is weak, making them prone to loosening and detachment, causing charging interruptions and affecting travel. This situation needs further improvement. Summary of the Invention

[0004] To address the problem of existing charging interfaces and plugs easily becoming loose and detached, this application provides a connection structure for the charging interface and plug, employing the following technical solution:

[0005] A connection structure for a charging interface and a charging plug includes a charging plug and a charging interface. The charging plug has a wire inside, with its left end electrically connected to a socket and its right end electrically connected to an input terminal. The charging plug has a sliding groove facing the charging interface, and a pushing block is slidably connected within the sliding groove. A power cavity is located above the sliding groove and communicates with it, filled with gas. A first elastic airbag is located on the side wall of the charging plug and communicates with the power cavity. The charging interface has a limiting groove. When the charging plug is engaged with the charging interface, the pushing block compresses the space in the sliding groove, causing the gas in the sliding groove and the power cavity to flow into the first elastic airbag, inflating it and embedding it into the limiting groove. The charging plug also has a limiting component to prevent the pushing block from returning to its original position.

[0006] By adopting the above technical solution, when the charging plug is combined with the charging interface, the pushing block first contacts the inner wall of the charging interface. When the charging plug is further inserted, the inner wall of the charging interface restricts the movement of the pushing block, causing the pushing block to move into the charging plug and compress the space of the sliding groove. This allows the gas in the sliding groove and the power chamber to flow into the first elastic airbag, causing the first elastic airbag to expand and embed itself in the limiting groove. This increases the bonding force between the charging plug and the charging interface, reducing the problem of the charging interface and the charging plug easily loosening and falling off. At the same time, the expanded first elastic airbag can seal the space between the charging plug and the charging interface, thereby preventing rainwater from entering the electrical contact point between the socket and the plug in rainy weather, thus preventing leakage and damage to the socket and the plug.

[0007] Optionally, the limiting component includes a spring plunger disposed at the outer end of the charging interface and a plunger groove disposed on the charging plug and cooperating with the spring plunger. When the first elastic airbag is embedded in the limiting groove, the spring plunger is embedded in the plunger groove.

[0008] By adopting the above technical solution, when the charging plug is connected to the charging interface, the first elastic airbag is embedded in the limiting groove, and the spring plunger also moves to the position of the plunger groove. Through the cooperation of the spring plunger and the plunger groove, the charging interface is snapped onto the charging plug. On the other hand, the cooperation of the first elastic airbag and the limiting groove makes the charging plug snapped onto the charging interface, forming a snap-fit ​​cooperation between the charging plug and the charging interface, which improves the stability of the connection.

[0009] Optionally, a second elastic airbag is provided in the plunger groove; the second elastic airbag is connected to the first elastic airbag through an air tube.

[0010] By adopting the above technical solution, when the charging plug is connected to the charging interface, on the one hand, the first elastic airbag and the limiting groove cooperate to make the charging plug snap onto the charging interface, and the spring plunger and the plunger groove cooperate to make the charging interface snap onto the charging plug, forming a snap-fit ​​engagement that improves the stability of the connection. On the other hand, when the pushing block compresses the gas in the power chamber, and the first elastic airbag has not yet reached the limiting groove, the gas will flow through the first elastic airbag and the air tube to the second elastic airbag. When the first elastic airbag is embedded in the limiting groove, the spring plunger moves to the position of the plunger groove and is embedded in the plunger groove, compressing the gas in the second elastic airbag back into the first elastic airbag, so that the first elastic airbag is embedded in the limiting groove, achieving a snap-fit ​​engagement. This reduces the problem of damage to the first elastic airbag caused by excessive friction between the first elastic airbag and the inner wall of the charging interface due to the expansion of the first elastic airbag during the insertion process. At the same time, the spring plunger restricts the recovery of the first elastic airbag, ensuring that it is firmly limited.

[0011] Optionally, the charging plug has a conductor connected to the wire inside, and the power cavity has an elastic membrane that divides the power cavity into a gas cavity and a storage cavity. The gas cavity is connected to the first elastic air bladder, and the storage cavity is connected to the sliding groove. The storage cavity and the sliding groove are filled with a current variant, the deformation voltage of which is the same as the charging voltage, and the current variant is in contact with the conductor.

[0012] By adopting the above technical solution, when the charging plug is combined with the charging interface, the pushing block first contacts the inner wall of the charging interface. When the charging plug is further inserted, the inner wall of the charging interface restricts the movement of the pushing block. The pushing block moves into the charging plug, squeezing the current variant in the sliding groove. When the current variant in the sliding groove is squeezed, it pushes the elastic membrane towards the gas cavity, compressing the space of the gas cavity, so that the gas in the gas cavity flows into the first elastic airbag, and the first elastic airbag is embedded in the limiting groove, thereby increasing the bonding force between the charging plug and the charging interface. When the charging plug and the charging interface are energized, the current passes through the conductor and contacts the current variant. When the current variant is energized, it changes from a liquid state to a solid state, thereby fixing the volume of the storage cavity and the sliding groove, restricting the gas in the first elastic airbag from flowing back into the gas cavity, and thus restricting the recovery of the first elastic airbag.

[0013] Optionally, a channel is provided at the right end of the sliding groove, and the sliding groove is connected to the storage cavity through the channel, which gradually narrows as it approaches the storage cavity.

[0014] By adopting the above technical solution, the sliding groove and the storage cavity are connected by a channel, so that when the push block compresses the current variant in the sliding groove, it is convenient for the current variant to flow from the sliding groove into the storage cavity. The channel gradually narrows along the direction that gradually approaches the storage cavity. When the charging plug and the charging interface are connected, the opening of the channel on one side of the sliding groove is wide, and the current variant can more easily enter the channel and flow into the storage cavity. When charging begins, the current variant changes from liquid to solid. Because the opening of the channel on one side of the storage cavity is narrow, the contact area between the side wall of the storage cavity near the sliding groove and the solid current variant is larger. When the gas pressure in the gas cavity acts on the current variant, the current variant can be more stably fixed in the storage cavity to compress the volume of the gas cavity.

[0015] Optionally, a piston is provided at one end of the pushing block near the sliding groove, and a return spring is provided between the piston and the bottom of the sliding groove.

[0016] By adopting the above technical solution, when the charging plug is plugged into the charging interface, the push block compresses the return spring when it moves into the charging plug. The return spring can provide a feedback force, improving the feedback feeling during plugging. After plugging is completed, when charging, the current variant in the sliding groove changes from liquid to solid, making the spring unable to return to its original state. When charging is completed, during the process of separating the charging plug from the charging interface, the current variant changes back to liquid, and the return spring makes it easier to pull out the charging plug. At the same time, the return spring can drive the push block to return to its original state, so that the sliding groove can return to its original volume, thereby allowing the gas in the first elastic airbag to flow into the gas chamber.

[0017] Optionally, a pressure sensor is provided at the position where the charging interface contacts the push block, and the pressure sensor is electrically connected to the controller of the electric vehicle.

[0018] By adopting the above technical solution, when the charging plug is plugged into the charging interface, the pushing block contacts the pressure sensor. The pressure sensor receives the pressure transmitted by the pushing block. When charging begins, the electromorphic fluid changes from a liquid state to a solid state, fixing the return spring and thus reducing the pressure of the return spring on the pressure sensor. When the charging voltage decreases, the strength of the solid state of the electromorphic fluid decreases, causing the pressure received by the pressure sensor to increase. Therefore, the charging voltage is monitored by detecting the pressure changes sensed by the pressure sensor.

[0019] Optionally, the diameter of the opening of the limiting groove is smaller than the radius inside the limiting groove.

[0020] By adopting the above technical solution, when the first elastic airbag is embedded in the limiting groove, since the diameter of the opening of the limiting groove is smaller than the radius inside the limiting groove, the first elastic airbag is more difficult to fall out of the limiting groove.

[0021] In summary, this application includes at least one of the following beneficial technical effects:

[0022] 1. When the charging plug is connected to the charging interface, the pushing block can cause the first elastic airbag to expand, so that the first elastic airbag is embedded in the limiting groove, thereby increasing the connection force between the charging plug and the charging interface and reducing the problem of the charging interface and the charging plug being easy to loosen and fall off; at the same time, the expanded first elastic airbag can seal the space between the charging plug and the charging interface, thereby preventing rainwater from entering the electrical contact position between the socket and the plug in rainy weather, thus causing leakage and damaging the socket and the plug.

[0023] 2. The second layer of engagement is achieved through a spring plunger and a plunger groove; and by setting a second elastic airbag in the plunger groove, the problem of damage to the first elastic airbag caused by excessive friction between the first elastic airbag and the inner wall of the charging interface due to the expansion of the first elastic airbag during the insertion process can be reduced. At the same time, when the spring plunger is embedded in the plunger groove, the gas in the second elastic airbag can be compressed back into the first elastic airbag. The spring plunger restricts the recovery of the first elastic airbag, making it firmly limited.

[0024] 3. When current passes through a conductor and comes into contact with an electromorphic variable, the electromorphic variable changes from a liquid state to a solid state when energized, thereby fixing the volume of the storage cavity and the sliding groove, thus restricting the gas in the first elastic airbag from flowing back into the gas cavity, and thus restricting the recovery of the first elastic airbag. Attached Figure Description

[0025] Figure 1 This is a schematic cross-sectional view of the structure in Embodiment 1 of this application where the charging interface and the charging plug are not fully connected;

[0026] Figure 2 This is a schematic cross-sectional view of the structure after the charging interface and the charging plug are connected in Embodiment 1 of this application;

[0027] Figure 3 This is a schematic cross-sectional view of the structure in Embodiment 2 of this application where the charging interface and the charging plug are not fully connected;

[0028] Figure 4 This is a schematic cross-sectional view of the structure during the connection process between the charging interface and the charging plug in Embodiment 2 of this application;

[0029] Figure 5 This is a schematic cross-sectional view of the structure after the charging interface and the charging plug are connected in Embodiment 2 of this application;

[0030] Figure 6 This is a schematic cross-sectional view of the structure in Embodiment 3 of this application where the charging interface and the charging plug are not fully connected;

[0031] Figure 7 This is a schematic cross-sectional view of the structure after the charging interface and the charging plug are connected in Embodiment 3 of this application.

[0032] Explanation of reference numerals in the attached drawings: 100, charging plug; 110, wire; 120, sliding groove; 121, channel; 130, push block; 131, piston; 132, return spring; 140, power chamber; 141, elastic membrane; 142, gas chamber; 143, storage chamber; 150, first elastic airbag; 160, conductor; 170, current transformer; 200, charging interface; 210, limiting groove; 300, limiting component; 310, spring plunger; 320, plunger groove; 321, second elastic airbag; 330, air tube. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of this invention clearer, the following description is provided in conjunction with the appendix. Figure 1-7 The present application will be further described in detail with reference to the embodiments described herein. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0034] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or may have an intervening element present. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or may have an intervening element present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0035] It should also be noted that the terms "first," "second," and "third," etc., in the specification and drawings of this application are used to distinguish different objects or different treatments of the same object, rather than to describe a specific order of objects. The terms "comprising" and "having," and any variations thereof, mentioned in the description of this application, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally include other steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or devices.

[0036] Example 1

[0037] This application discloses a connection structure between a charging interface and a charging plug. (Refer to...) Figure 1 The device includes a charging plug 100 and a charging interface 200. The charging plug 100 has a wire 110 inside, with its left end electrically connected to the plug hole and its right end electrically connected to the input terminal. A sliding groove 120 is provided on the side of the charging plug 100 facing the charging interface 200. A push block 130 is slidably connected within the sliding groove 120. A power cavity 140 is provided above the sliding groove 120 and is connected to it. The power cavity 140 is filled with gas. A first elastic airbag 150 is provided on the side wall of the charging plug 100 and is connected to the power cavity 140. The charging interface 200 has a limiting groove 210.

[0038] Reference Figure 2 , Figure 2This is a schematic cross-sectional view of the structure after the charging interface and charging plug are connected. When the charging plug 100 is connected to the charging interface 200, the pushing block 130 compresses the gas in the sliding groove 120, causing the gas in the sliding groove 120 and the power chamber 140 to flow into the first elastic airbag 150, causing the first elastic airbag 150 to expand and embed into the limiting groove 210; then the pushing block 130 is restricted to return to its original position by the limiting component 300 provided in the charging plug 100.

[0039] The limiting component 300 includes a spring plunger 310 disposed at the outer end of the charging interface 200 and a plunger groove 320 disposed in the charging plug 100 and cooperating with the spring plunger 310. Figure 2 As can be seen, when the charging plug 100 is connected to the charging interface 200, the first elastic airbag 150 is embedded in the limiting groove 210, and the spring plunger 310 also moves to the position of the plunger groove 320. Through the cooperation of the spring plunger 310 and the plunger groove 320, the charging interface 200 is snapped onto the charging plug 100. On the other hand, the cooperation of the first elastic airbag 150 and the limiting groove 210 makes the charging plug 100 snap onto the charging interface 200, forming a snap-fit ​​cooperation between the charging plug 100 and the charging interface 200, which improves the stability of the connection.

[0040] This connection structure increases the bonding force between the charging plug 100 and the charging interface 200, reducing the likelihood of the charging interface 200 and the charging plug 100 becoming loose or detached. Simultaneously, the inflatable first elastic airbag 150 seals the space between the charging plug 100 and the charging interface 200, preventing rainwater from entering the electrical contact point between the socket and the plug in rainy conditions, thus avoiding leakage and damage to the socket and plug. When subjected to shaking or impact, the first elastic airbag 150 also provides cushioning, making the connection between the charging interface 200 and the charging plug 100 more stable and reducing the likelihood of loosening.

[0041] Example 2

[0042] Example 2 is a further optimization based on Example 1. (Refer to...) Figure 3 A second elastic airbag 321 is provided in the plunger groove 320, and the second elastic airbag 321 is connected to the first elastic airbag 150 through an air tube 330.

[0043] During the connection process between the charging plug 100 and the charging interface 200, refer to Figure 4 , Figure 4This is a structural cross-sectional schematic diagram of the connection process between the charging interface and the charging plug in Embodiment 2. When the pushing block 130 begins to compress the gas in the sliding groove 120, the gas flows into the first elastic airbag 150. However, at this time, the first elastic airbag 150 has not yet moved to the position of the limiting groove 210. Under the limitation of the inner wall of the charging interface 200, the first elastic airbag 150 cannot expand. Therefore, the gas flows through the air pipe 330 into the second elastic airbag 321, which is used to temporarily contain the gas.

[0044] Reference Figure 5 , Figure 5 This is a schematic cross-sectional view of the structure after the charging interface and charging plug are connected in Embodiment 2. When the charging interface 200 and the charging plug 100 are connected, the first elastic airbag 150 is embedded in the limiting groove 210, and the spring plunger 310 also moves to the position of the plunger groove 320. At this time, the spring plunger 310 occupies the space of the plunger groove 320 under the action of the spring force. The gas inside the second elastic airbag 321 flows back to the first elastic airbag 150 through the air tube 330 under the action of the spring plunger 310, causing the first elastic airbag 150 to expand, thus realizing a firm connection between the charging interface 200 and the charging plug 100.

[0045] The above structure can reduce the problem of damage to the first elastic airbag 150 caused by excessive friction between the first elastic airbag 150 and the inner wall of the charging interface 200 during the insertion process.

[0046] Example 3

[0047] Example 3 is a further optimization of Example 1 or Example 2, referred to Figure 6 , Figure 6 A schematic cross-sectional view of the structure in Embodiment 3 where the charging interface and charging plug are not fully connected. (See attached diagram.) Figure 6 As shown, the charging plug 100 has a conductor 160 connected to the wire 110 inside, and an elastic membrane 141 is provided inside the power chamber 140. The elastic membrane 141 divides the power chamber 140 into a gas chamber 142 and a storage chamber 143. The gas chamber 142 is connected to the first elastic airbag 150, and the storage chamber 143 is connected to the sliding groove 120. The storage chamber and the sliding groove 120 are filled with a current variant 170. The deformation voltage of the current variant 170 is the same as the charging voltage, and the current variant 170 is in contact with the conductor 160.

[0048] When the charging plug 100 is connected to the charging interface 200, the pushing block 130 first contacts the inner wall of the charging interface 200. As the charging plug 100 is further inserted, the pushing block 130 moves into the charging plug 100 under the reaction force of the inner wall. Since the sliding groove 120 is filled with current variants 170, and the charging interface 200 is not fully connected to the charging plug 100 at this time, the wire 110 is not conductive, and the current variants 170 are in a liquid state. Therefore, the pushing block 130 can squeeze the current variants 170 in the sliding groove 120. When the current variants 170 in the sliding groove 120 are squeezed, they flow into the storage cavity 143, pushing the elastic membrane 141 towards the gas cavity 142, compressing the space of the gas cavity 142, and causing the gas in the gas cavity 142 to flow into the first elastic airbag 150, so that the first elastic airbag 150 is embedded in the limiting groove 210, thereby increasing the bonding force between the charging plug 100 and the charging interface 200.

[0049] Reference Figure 7 When the charging interface 200 is fully connected to the charging plug 100, most of the current variants 170 in the sliding groove 120 have flowed into the storage cavity 143, increasing the volume of the storage cavity 143. This causes the gas to compress into the gas cavity 142, and the gas in the gas cavity 142 flows into the first elastic airbag 150, causing the first elastic airbag 150 to expand and thus engage within the limiting groove 210. Simultaneously, when the power terminal of the charging plug 100 contacts the power terminal of the charging interface 200, current is generated in the wire 110. This current flows through the conductor 160 and contacts the current variant 170. Since the deformation voltage of the current variant 170 is the same as the charging voltage, the current variant 170 changes from a liquid state to a solid state. This fixes the volume of the storage cavity 143 and the sliding groove 120, restricting the gas in the first elastic airbag 150 and causing the push block 130 to return to its original position.

[0050] Furthermore, a channel 121 is provided at the right end of the sliding groove 120, and the sliding groove 120 is connected to the storage cavity 143 through the channel 121. The channel 121 gradually narrows along the direction that gradually approaches the storage cavity 143. When the push block 130 compresses the current variant 170 in the sliding groove 120, it facilitates the flow of the current variant 170 from the sliding groove 120 into the storage cavity 143. The channel 121 gradually narrows along the direction that gradually approaches the storage cavity 143. When the charging plug 100 and the charging interface 200 are connected, the opening of the channel 121 on one side of the sliding groove 120 is wide, making it easier for the current variant 170 to enter the channel 121 and flow into the storage cavity 143. When charging begins, the current variant 170 changes from a liquid state to a solid state. Due to the narrow opening of the channel 121 on one side of the storage cavity 143, the contact area between the side wall of the storage cavity 143 near the sliding groove 120 and the solid current variant 170 is larger. When the gas pressure in the gas cavity 142 acts on the current variant 170, the current variant 170 can be more stably fixed in the storage cavity 143 to compress the volume of the gas cavity 142.

[0051] In addition, to make the charging connector more stable and harder to unplug during charging, and easier to unplug after charging is finished.

[0052] like Figure 7 As shown, a piston 131 is provided at one end of the push block 130 near the sliding groove 120. The piston 131 is always located on the left side of the channel 121. A return spring 132 is provided between the piston 131 and the bottom of the sliding groove 120. When the charging plug 100 is plugged into the charging interface 200, the push block 130 moves into the charging plug 100 and compresses the return spring 132. The return spring 132 can provide a feedback force to the user, enhancing the user's feedback when plugging in. After plugging in, when charging, the current variant 170 in the sliding groove 120 changes from liquid to solid. At this time, the return spring 132 is also fixed and cannot return to its original state. When charging is completed, during the process of separating the charging plug 100 from the charging interface 200, the current variant 170 changes back to liquid, and the return spring 132 can return to its original state, which can drive the push block 130 to return to its original state, so that the sliding groove 120 can return to its original volume. This allows the gas in the first elastic airbag 150 to flow into the gas chamber 142, making it easier to pull out the charging plug 100. The return spring 132 is a tower spring, which allows it to be compressed to a smaller thickness.

[0053] Furthermore, in some specific embodiments, a pressure sensor is provided at the contact point between the charging interface 200 and the push block 130. The pressure sensor is electrically connected to the electric vehicle controller. When the charging plug 100 is plugged into the charging interface 200, the push block 130 contacts the pressure sensor, and the pressure sensor receives the pressure transmitted by the push block 130. When charging begins, the current transformer 170 changes from a liquid state to a solid state, fixing the return spring 132, thereby reducing the pressure of the return spring 132 on the pressure sensor. When the charging voltage decreases, the solid strength of the current transformer 170 decreases, causing the pressure received by the pressure sensor to increase. Thus, by utilizing the characteristics of the current transformer 170, the charging voltage is monitored by the pressure change sensed by the pressure sensor.

[0054] Furthermore, the diameter of the opening of the limiting groove 210 is smaller than the radius inside the limiting groove 210. When the first elastic airbag 150 is embedded in the limiting groove 210, the first elastic airbag 150 is more difficult to fall out of the limiting groove 210 because the diameter of the opening of the limiting groove 210 is smaller than the radius inside the limiting groove 210.

[0055] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A connection structure of a charging interface and a charging plug, characterized by: The device includes a charging plug (100) and a charging interface (200). The charging plug (100) has wires (110) at both ends inside. The left wire (110) is electrically connected to the socket of the charging plug (100), and the right wire (110) is electrically connected to the input end of the charging plug (100). A sliding groove (120) is provided on the side of the charging plug (100) facing the charging interface (200). A push block (130) is slidably connected within the sliding groove (120). A power cavity (140) is provided above the sliding groove (120) and is connected to the sliding groove (120). The power cavity (140) is filled with gas. The side wall of (100) is provided with a first elastic airbag (150), the interior of the first elastic airbag (150) is connected to the power cavity (140), and the charging interface (200) is provided with a limiting groove (210); when the charging plug (100) is combined with the charging interface (200), the pushing block (130) compresses the space of the sliding groove (120), so that the gas in the sliding groove (120) and the power cavity (140) flows into the first elastic airbag (150), so that the first elastic airbag (150) expands and is embedded in the limiting groove (210); the charging plug (100) is provided with a limiting component (300) for limiting the recovery of the pushing block (130). The charging plug (100) has a conductor (160) connected to the wire (110) inside. The power cavity (140) has an elastic membrane (141) inside, which divides the power cavity (140) into a gas cavity (142) and a storage cavity (143). The gas cavity (142) is connected to the first elastic airbag (150), and the storage cavity (143) is connected to the sliding groove (120). The storage cavity (143) and the sliding groove (120) are filled with a current variant (170). The deformation voltage of the current variant (170) is the same as the charging voltage, and the current variant (170) is connected to the conductor (160). The body (160) is in contact with each other; the pushing block (130) can squeeze the current variant (170) in the sliding groove (120), and when the current variant (170) in the sliding groove (120) is squeezed, it flows to the storage cavity (143), pushes the elastic membrane (141) towards the gas cavity (142), compresses the space of the gas cavity (142), and makes the gas in the gas cavity (142) flow into the first elastic airbag (150), so that the first elastic airbag (150) is embedded in the limiting groove (210), thereby increasing the bonding force between the charging plug (100) and the charging interface (200); A channel (121) is provided at the right end of the sliding groove (120). The sliding groove (120) is connected to the storage cavity (143) through the channel (121). The channel (121) gradually narrows along the direction that gradually approaches the storage cavity (143). The limiting component (300) includes a spring plunger (310) disposed at the outer end of the charging interface (200) and a plunger groove (320) disposed on the charging plug (100) and cooperating with the spring plunger (310); when the first elastic airbag (150) is embedded in the limiting groove (210), the spring plunger (310) is embedded in the plunger groove (320); A second elastic airbag (321) is provided in the plunger groove (320); the second elastic airbag (321) is connected to the first elastic airbag (150) through an air tube (330).

2. The connection structure of the charging interface and the charging plug according to claim 1, characterized in that: A piston (131) is provided at one end of the push block (130) near the sliding groove (120), and a return spring (132) is provided between the piston (131) and the bottom of the sliding groove (120).

3. The connection structure of the charging interface and the charging plug according to claim 2, characterized in that: A pressure sensor is provided at the position where the charging interface (200) contacts the push block (130), and the pressure sensor is electrically connected to the controller of the electric vehicle.

4. The connection structure of the charging interface and the charging plug according to claim 1, characterized in that: The diameter of the opening of the limiting groove (210) is smaller than the radius inside the limiting groove (210).

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