Electrical connection assembly

Abstract

The utility model discloses an electric connection assembly, which is used for being in butt joint with a butt joint assembly and comprises a shell, the shell is provided with a butt joint section, the butt joint section is provided with a first butt joint cavity, the front end of the first butt joint cavity is open, the rear end of the first butt joint cavity is provided with a rear wall surface, one side of the first butt joint cavity is provided with a first side wall connected with the rear wall surface, and the other side of the first butt joint cavity is provided with a second side wall connected with the rear wall surface. The first side wall is provided with a glue injection hole communicated with the first butt joint cavity; the waterproof piece is formed on the inner circumferential surface of the first butt joint cavity through glue injection of the glue injection hole, and the waterproof piece is used for abutting against the butt joint assembly to form waterproof sealing; and the electric connection component is positioned in the first butt joint cavity and is used for forming electric connection with the butt joint assembly. Glue is injected into the first butt-joint cavity through the glue injection hole, the waterproof part is formed on the inner circumferential face of the first butt-joint cavity in cooperation with the mold inserted into the first butt-joint cavity, and therefore the waterproof part is integrally connected with the inner circumferential face of the first butt-joint cavity, the waterproof part is prevented from loosening or displacing from the inner circumferential face of the first butt-joint cavity, and then the waterproof grade of the electric connection assembly is improved.

Description

Technical field

[0001] The utility model relates to an electrical connection assembly, in particular to an electrical connection assembly with a waterproof part. [Background Technology]

[0002] The vehicle-mounted socket connector and plug connector have the requirement of being waterproof during the docking process. In order for the plug connector to be smoothly inserted into the docking cavity of the socket connector, a fitting gap must be left between the socket connector and the plug connector. In order to meet the waterproof requirements, technical personnel in this field generally assemble a waterproof ring and let the waterproof ring fill the gap to achieve waterproofing. However, since the waterproof ring is easy to shrink inward, it is difficult to assemble and fix the waterproof ring on the inner surface of the docking cavity, and the waterproof ring may also wear or deform during the assembly process, resulting in a reduction in the waterproof sealing ability of the waterproof ring. Moreover, the waterproof ring is generally arranged on the outer surface of the plug connector, which means that the waterproof ring will be exposed to the outside when not docked, which is more susceptible to damage and will cause displacement, resulting in an inability to accurately seal the fitting gap. [Utility Model Content]

[0003] In view of the background technology, the applicant provides an electrical connection component with a waterproof part provided on the inner circumference of the first docking cavity, and a glue injection hole is provided on the side wall surrounding the first docking cavity. The glue injection hole can be used to inject glue into the first docking cavity, and the waterproof part can be formed on the inner circumference of the first docking cavity in conjunction with the mold inserted into the first docking cavity. The waterproof part can be attached and fixed to the inner circumference of the first docking cavity.

[0004] In order to achieve the above purpose, the utility model adopts the following technical means:

[0005] An electrical connection component, used to connect with a docking component, includes a shell, which has a docking section, the docking section has a first docking cavity, the front end of the first docking cavity is open, the rear end of the first docking cavity has a rear wall surface, one side of the first docking cavity has a first side wall connected to the rear wall surface, the first side wall has a glue injection hole connected to the first docking cavity; a waterproof part, which is formed on the inner circumferential surface of the first docking cavity by injecting glue through the glue injection hole, the waterproof part is used to abut the docking component to form a waterproof seal; an electrical connection component, which is located in the first docking cavity and is used to form an electrical connection with the docking component.

[0006] Furthermore, the first docking cavity has a second side wall connected to the rear wall surface, the second side wall and the first side wall are located on opposite sides of the electrical connection component, the second side wall has a glue overflow groove recessed outward from the inner surface, the glue overflow groove extends to the front end surface of the second side wall, and the waterproof component fills the glue overflow groove.

[0007] Furthermore, the first side wall and the mounting surface of the docking assembly are located on the same side of the electrical connection component, and the length of the first side wall extending forward from the rear wall surface is shorter than the length of the second side wall.

[0008] Furthermore, the waterproof member has a short wall attached to the inner surface of the first side wall and a long wall attached to the inner surface of the second side wall.

[0009] Furthermore, the waterproof part has a plurality of waterproof ribs protruding inward, each of the waterproof ribs surrounds the electrical connection component, and the plurality of waterproof ribs are located behind the front end surface of the short wall.

[0010] Furthermore, the rear wall surface is provided with a channel at the rear, and the electrical connection component protrudes forward from the channel and enters the first docking cavity. The length of the electrical connection component protruding forward from the rear wall surface is greater than the length of the first side wall extending forward from the rear wall surface, and is less than the length of the second side wall extending forward from the rear wall surface.

[0011] Furthermore, the rear hole wall of the glue injection hole is aligned with the rear wall surface, and the front hole wall of the glue injection hole is located behind the front end surface of the first side wall.

[0012] Furthermore, the electrical connection component is a USB Type-C connector and has a second docking cavity open forward for inserting the docking terminal of the docking assembly. The electrical connection component is surrounded by the waterproof component and is spaced apart from the waterproof component along its circumferential direction.

[0013] Furthermore, it also includes a waterproof cover inserted into the first docking cavity, the waterproof cover has a base, a waterproof sleeve and two clamping arms protruding backward from the base, the waterproof sleeve is sealed on all sides and open at the rear end, the two clamping arms are located on the left and right sides of the waterproof sleeve and press against the outer surfaces of the opposite sides of the docking section, before docking with the docking assembly, the waterproof sleeve is accommodated between the electrical connection member and the waterproof part and contacts the inner surface of the waterproof part.

[0014] Furthermore, the docking section has a plurality of guide ribs extending in the front-to-back direction in the circumferential direction, and the waterproof cover has a plurality of protective plates extending backward from the base, and the plurality of protective plates are spaced apart and located on the periphery of the waterproof sleeve, and the protective plates cover the guide ribs.

[0015] Furthermore, the housing also includes an extension section and a locking arm, the extension section is located behind the docking section, the locking arm extends from the docking section to the extension section, the extension section has a rearwardly open accommodating cavity, the electrical connection component is connected to a cable in the accommodating cavity, the cable extends outward and beyond the accommodating cavity, a stress relief piece closes the rear end of the accommodating cavity, the stress relief piece has a sleeve portion for the cable to pass through, the sleeve portion extends rearward along the outer surface of the cable, a rear cover covers a portion of the extension section and a portion of the stress relief piece, the rear cover has a through hole for the sleeve portion and the cable to pass through.

[0016] 14. The electrical connection component as claimed in claim 13, wherein the first and second side panels are connected to each other through a hole in the front end of the first docking cavity and a hole in the back end of the first docking cavity. The electrical connection component as claimed in claim 13 is a socketed socketed socket. The socketed socket has two holes, one for connecting the first and second side panels and one for connecting the second side panels. The sockets have two holes, one for connecting the first and second side panels and a hole in the back end of the first docking cavity ...

[0017] The above technical means have the following technical effects: glue is injected into the first docking cavity using the glue injection hole, and the waterproof component is formed on the inner circumference of the first docking cavity in conjunction with a mold inserted into the first docking cavity. The waterproof component can thereby be integrally connected to the inner circumference of the first docking cavity, preventing the waterproof component from loosening or shifting from the inner circumference of the first docking cavity, thereby improving the waterproof level of the electrical connection assembly and increasing the use scenarios of the electrical connection assembly. In addition, the waterproof component is not exposed on the outer surface of the electrical connection assembly and is not easily damaged by bumps, thereby increasing its service life.

Brief Description of the Drawings

[0018] Figure 1 is a schematic diagram of the electrical connection assembly of the present utility model;

[0019] Figure 2 is a top view of the housing;

[0020] Figure 3 for Figure 1 Sectional view along line AA;

[0021] Figure 4 for Figure 3 Combination chart of

[0022] Figure 5 This is a schematic diagram of a waterproof cover;

[0023] Figure 6 is another schematic diagram of an electrical connection assembly;

[0024] Figure 7 Exploded view of the outer case, strain relief, and back cover.

[0025] Description of Figure Numbers:

[0026] Electrical connection assembly 1000 housing 1 docking section 11

[0027] First docking cavity 111 rear wall 112 first side wall 113

[0028] Glue injection hole 1131 Second side wall 114 Glue overflow groove 1141

[0029] Third side wall 115 Guide rib 116 Extension section 12

[0030] Accommodating cavity 121 Locking arm 13 Electrical connection member 2

[0031] Metal shell 21 Second docking cavity 22 Insulation body 23

[0032] Waterproof part 3 short wall 31 long wall 32

[0033] Waterproof rib 33 Waterproof cover 4 Base 41

[0034] Waterproof sleeve 42 Clamping arm 43 Protective plate 44

[0035] Cable 5 Waterproof glue 6 Strain relief 7

[0036] Sleeve portion 71 Back cover 8 Through hole 81 [Specific implementation method]

[0037] In order to facilitate a better understanding of the purpose, structure, features and effects of the present invention, the present invention will be further described in conjunction with the accompanying drawings and specific implementation methods.

[0038] Figures 1 to 7The present invention illustrates an electrical connection assembly 1000 for docking with a docking assembly. The assembly comprises a housing 1, an electrical connection member 2, and a waterproof component 3. The housing 1 includes a docking section 11, which has a first docking cavity 111. The first docking cavity 111 is open at its front end and has a rear wall 112 at its rear end. The first docking cavity 111 has a first sidewall 113 and a second sidewall 114 connected to the rear wall 112 on its upper and lower sides. The second sidewall 114 is located on opposite upper and lower sides of the electrical connection member 2. The first docking cavity 111 has two third sidewalls 115 on its left and right sides, connecting the first sidewall 113 and the second sidewall 114. The docking section 11 is circumferentially provided with a plurality of guide ribs 116 extending in a front-to-rear direction. These guide ribs 116 are used to cooperate with the docking assembly, maintaining a single insertion orientation of the electrical connection assembly 1000 during the docking process, ensuring that the electrical connection member 2 properly contacts the docking terminals. A channel is defined rearwardly on the rear wall 112, through which the electrical connection member 2 protrudes forward and enters the first docking cavity 111. The electrical connection member 2 is used to establish an electrical connection with the docking assembly. In the illustrated embodiment, the electrical connection member 2 is a USB Type-C connector, comprising a metal shell 21, a second docking cavity 22 enclosed by the metal shell 21 and open forwardly, and an insulating body 23 and a plurality of conductive terminals (not shown) housed in the second docking cavity 22. In other embodiments not shown, the electrical connection member 2 may comprise a plurality of exposed conductive terminals. The waterproof part 3 is also accommodated in the first docking cavity 111. The waterproof part 3 is formed on the inner circumferential surface of the first docking cavity 111 by glue injection. The electrical connection component 2 is surrounded by the waterproof part 3 and is spaced apart from the waterproof part 3 along its circumferential direction to accommodate the docking assembly.

[0039] refer to Figures 1 to 3Because the first side wall 113 and the mounting surface of the docking assembly are located on the same side of the electrical connection member 2, the length of the first side wall 113 extending forward from the rear wall 112 is less than the length of the second side wall 114, and is also less than the length of the electrical connection member 2 protruding forward from the rear wall 112. This allows space for the docking assembly to be installed on the mounting surface of the circuit board, thereby making room for the circuit board. The length of the second side wall 114 extending forward from the rear wall 112 is greater than the length of the electrical connection member 2 protruding forward from the rear wall 112, thereby protecting the electrical connection member 2. The first side wall 113 has a glue injection hole 1131 that communicates with the first docking cavity 111. The rear wall of the glue injection hole 1131 is aligned with the rear wall 112, and the front wall of the glue injection hole 1131 is located behind the front end of the first side wall 113. The second sidewall 114 has a glue overflow groove 1141 recessed outward from its inner surface. This groove 1141 extends to the front end of the second sidewall 114 and is spaced a distance from the glue injection hole 1131 in the front-to-back direction. The waterproof member 3 has a short wall 31 attached to the inner surface of the first sidewall 113 and a long wall 32 attached to the inner surface of the second sidewall 114, thereby adapting to the shape of the docking section 11. The docking assembly housed in the first docking cavity 111 abuts against the inner side of the waterproof member 3, forming a waterproof seal that prevents liquid and moisture from entering the electrical connection member 2, ensuring that the electrical connection member 2 remains dry.

[0040] The waterproof member 3 has a plurality of inwardly projecting waterproof ribs 33, each of which surrounds the electrical connection member 2. The plurality of waterproof ribs 33 are located behind the front end of the short wall 31, i.e., the portion of the long wall 32 that extends forward from the short wall 31 is not provided with the waterproof ribs 33. The waterproof ribs 33 are symmetrical. When the docking assembly enters the first docking cavity 111, the upper and lower sides of the docking assembly simultaneously abut against the waterproof ribs 33, ensuring that the waterproof member 3 exerts an equal pressure on the docking assembly, allowing the docking assembly to be inserted into the first docking cavity 111 facing the electrical connection member 2. In this embodiment, there are three waterproof ribs 33. The waterproof ribs 33 surround the electrical connection member 2, and the entire waterproof member 3 is spaced circumferentially from the electrical connection member 2 to provide clearance for the docking assembly to be inserted into the first docking cavity 111. The plurality of waterproof ribs 33 will abut against the docking assembly to form a multiple waterproof seal, further increasing the waterproof effect of the waterproof part 3 and preventing external liquid and water vapor from invading the electrical connection component 2 and causing a short circuit or corrosion of the electrical connector component.

[0041] refer to Figures 1 to 3, the injection hole 1131 is provided so that the waterproof member 3 can be directly formed by injecting glue into the first docking cavity 111. The waterproof member 3 can be made of a waterproof material commonly used in the field of electrical connections, such as silicone. Simply put, the housing 1 is first provided, and the corresponding mold is inserted into the first docking cavity 111. The molten material constituting the waterproof member 3 is injected from the injection hole 1131 into the injection space surrounded by the side walls and the mold. The molten material is cooled and solidified to form the waterproof member 3. The waterproof member 3 thus formed is attached to the inner circumference of the first docking cavity 111, or is integrally connected to the inner circumference. By allowing the waterproof member 3 to cool directly from its molten state on the inner circumference of the first docking cavity 111, the waterproof member 3 is firmly bonded to the first sidewall 113, the second sidewall 114, and the third sidewall 115. No jig is required to insert the waterproof member 3 into the first docking cavity 111. Therefore, the waterproof member 3 is not subjected to the force of the jig, nor is it deformed. The waterproof member 3 will not fall off the inner circumference of the first docking cavity 111 due to restoring its shape. The waterproof member 3 thus formed covers and fills the glue injection hole 1131 and also fills the glue overflow groove 1141.

[0042] When molding the waterproof component 3, the mold described above will not cover the overflow groove 1141. Observing whether the overflow groove 1141 is filled with molten plastic can assist in determining whether the injection space is completely filled. Since the rear hole wall of the injection hole 1131 is aligned with the rear wall surface 112, the molten plastic can only extend forward after entering the injection space. The overflow groove 1141 is located at the front end of the longer second side wall 114, and the injection hole 1131 is located at the rear end of the first side wall 113. The overflow groove 1141 and the injection hole 1131 are located at both the front and rear ends of the injection space and at the upper and lower sides of the injection space. Therefore, when the molten plastic fills the overflow groove 1141, it means that the molten plastic has filled the entire injection space.

[0043] like Figure 1 、 Figures 3 to 5 As shown, the electrical connection assembly 1000 further includes a waterproof cover 4. When the electrical connection assembly 1000 is stored alone, the waterproof cover 4 is inserted into the first docking cavity 111 to seal it and prevent liquid from invading the electrical connection member 2. The waterproof cover 4 does not participate in the connection between the electrical connection assembly 1000 and the docking assembly. When the electrical connection assembly 1000 and the docking assembly are docked, the waterproof cover 4 must be removed before the two can be docked. Therefore, the waterproof cover 4 is not used when the electrical connection assembly 1000 is in use.

[0044] like Figure 1 、 Figures 3 to 5As shown, the waterproof cover 4 comprises a base 41, a waterproof sleeve 42 projecting rearwardly from the base 41, and two clamping arms 43. The waterproof sleeve 42 is sealed on all sides and open at the rear end. The two clamping arms 43 are located on the left and right sides of the waterproof sleeve 42 and press against the outer surfaces of the two third side walls 115 on the left and right sides of the docking section 11. When not docked with the docking assembly, the waterproof sleeve 42 is housed in the space between the electrical connection member 2 and the waterproof component 3 and abuts against the waterproof ribs 33, preventing the electrical connection member 2 from being infiltrated by liquid before use and thus malfunctioning. The waterproof cover 4 also comprises a plurality of protective plates 44 extending rearwardly from the base 41. These protective plates 44 are spaced apart around the outer periphery of the waterproof sleeve 42. The protective plates 44 cover the guide ribs 116 to prevent them from being damaged before use and ensure that the guide ribs 116 can properly guide the electrical connection assembly 1000 and the docking assembly.

[0045] like Figure 6 and Figure 7 As shown, the housing 1 further includes an extension section 12 and a locking arm 13. The extension section 12 is located behind the docking section 11. The locking arm 13 extends from the docking section 11 to the extension section 12. The extension section 12 has a rearwardly open receiving cavity 121. The electrical connection member 2 is connected to a cable 5 within the receiving cavity 121. The cable 5 extends outward and beyond the receiving cavity 121. A waterproof adhesive 6 is provided in the receiving cavity 121 to fill the gap. A strain relief member 7 closes the rear end of the receiving cavity 121. The strain relief member 7 has a sleeve portion 71 for the cable 5 to pass through. The sleeve portion 71 extends rearward along the outer surface of the cable 5. A rear cover 8 covers and secures a portion of the extension section 12. The rear cover 8 also covers a portion of the strain relief member 7 to prevent the strain relief member 7 from separating from the extension section 12. The rear cover 8 has a through hole 81 for the sleeve portion 71 and the cable 5 to pass through.

[0046] The electrical connection assembly of the utility model has the following beneficial effects:

[0047] (1) Glue is injected into the first docking cavity 111 using the glue injection hole 1131, and the mold inserted into the first docking cavity 111 is used to form the waterproof member 3 on the inner circumference of the first docking cavity 111. The waterproof member 3 can thereby be integrally connected to the inner circumference of the first docking cavity 111, preventing the waterproof member 3 from loosening or shifting from the inner circumference of the first docking cavity 111, thereby improving the waterproof level of the electrical connection assembly 1000 and increasing the usage scenarios of the electrical connection assembly 1000. In addition, the waterproof member 3 is not exposed on the outer surface of the electrical connection assembly 1000, and is not easily damaged by bumps, thereby increasing its service life.

[0048] (2) The overflow glue groove 1141 is located at the front end of the longer first side wall 113, and is located at the front and rear ends of the glue injection space with the glue injection hole 1131. Moreover, the overflow glue groove 1141 and the glue injection hole 1131 are respectively located on the first side wall 113 and the second side wall 114 which are opposite to each other in the upper and lower directions. Therefore, whether the overflow glue groove 1141 is filled with molten plastic can be used to indicate whether the glue injection space for molding the waterproof part 3 is completely filled.

[0049] (3) The length of the first side wall 113 extending forward from the rear wall surface 112 is less than the length of the second side wall 114, so as to leave space for the docking assembly to be installed on the mounting surface of the circuit board to make way for the circuit board.

[0050] (4) The waterproof rib 33 is arranged behind the front end surface of the short wall 31, that is, the portion of the long wall 32 that extends forward beyond the short wall 31 is not provided with the waterproof rib 33. The waterproof rib 33 is symmetrical up and down. When the docking assembly enters the first docking cavity 111, the upper and lower sides of the docking assembly simultaneously abut against the waterproof rib 33, so that the squeezing force of the waterproof part 3 on the docking assembly is equal up and down, so that the docking assembly can be inserted into the first docking cavity 111 facing the electrical connection component 2, and at the same time, the special-shaped docking section 11 has a waterproof function to prevent the electrical connection component 2 from being invaded by external liquid and water vapor.

[0051] (5) The waterproof sleeve 42 of the waterproof cover 4 is inserted between the waterproof rib 33 and the electrical connection member 2, and the outer surface of the waterproof sleeve 42 abuts against the waterproof rib 33, so that the electrical connection component 1000 can also have a waterproof function when not in use, which is beneficial for the electrical connection component 1000 to overcome the storage and transportation in a humid environment.

[0052] The above detailed description is only an illustration of the preferred embodiment of the present invention, and does not limit the patent scope of the present invention. Therefore, all equivalent technical changes made by using the description and illustrations of the present invention are included in the patent scope of the present invention.

Claims

1. An electrical connection assembly for connecting to a docking assembly, characterized in that: The invention comprises a shell having a docking section, wherein the docking section has a first docking cavity, the front end of the first docking cavity is open, the rear end of the first docking cavity has a rear wall surface, one side of the first docking cavity has a first side wall connected to the rear wall surface, the first side wall has a glue injection hole connected to the first docking cavity; a waterproof component, which is formed on the inner circumference of the first docking cavity by injecting glue through the glue injection hole, and the waterproof component is used to abut the docking assembly to form a waterproof seal; an electrical connection component, which is located in the first docking cavity and is used to form an electrical connection with the docking assembly.

2. The electrical connection assembly according to claim 1, wherein: The first docking cavity has a second side wall connected to the rear wall surface, the second side wall and the first side wall are located on opposite sides of the electrical connection component, the second side wall has a glue overflow groove recessed outward from the inner surface, the glue overflow groove extends to the front end surface of the second side wall, and the waterproof component fills the glue overflow groove.

3. The electrical connection assembly according to claim 2, wherein: The first side wall and the mounting surface of the docking assembly are located on the same side of the electrical connection component, and a length of the first side wall extending forward from the rear wall surface is shorter than a length of the second side wall.

4. The electrical connection assembly according to claim 3, wherein: The waterproof member has a short wall attached to the inner surface of the first side wall and a long wall attached to the inner surface of the second side wall.

5. The electrical connection assembly according to claim 4, wherein: The waterproof part has a plurality of waterproof ribs protruding inward, each of the waterproof ribs surrounds the electrical connection component, and the plurality of waterproof ribs are located behind the front end surface of the short wall.

6. The electrical connection assembly according to claim 3, wherein: The rear wall surface is provided with a channel at the rear, and the electrical connection member protrudes forward from the channel and enters the first docking cavity. The length of the electrical connection member protruding forward from the rear wall surface is greater than the length of the first side wall extending forward from the rear wall surface, and is less than the length of the second side wall extending forward from the rear wall surface.

7. The electrical connection assembly according to claim 1, wherein: The rear hole wall of the glue injection hole is aligned with the rear wall surface, and the front hole wall of the glue injection hole is located behind the front end surface of the first side wall.

8. The electrical connection assembly according to claim 1, wherein: The electrical connection component is a USB Type-C connector and has a second docking cavity open forward for inserting the docking terminal of the docking assembly. The electrical connection component is surrounded by the waterproof component and spaced apart from the waterproof component along its circumferential direction.

9. The electrical connection assembly according to claim 8, wherein: It also includes a waterproof cover inserted into the first docking cavity, the waterproof cover having a base, a waterproof sleeve and two clamping arms protruding backward from the base, the waterproof sleeve is sealed on all sides and open at the rear end, the two clamping arms are located on the left and right sides of the waterproof sleeve and press against the outer surfaces of the opposite sides of the docking section, before docking with the docking assembly, the waterproof sleeve is accommodated between the electrical connection member and the waterproof part and contacts the inner surface of the waterproof part.

10. The electrical connection assembly according to claim 9, wherein: The docking section has a plurality of guide ribs extending in the front-to-back direction in the circumferential direction, and the waterproof cover has a plurality of protective plates extending backward from the base. The plurality of protective plates are spaced and distributed around the periphery of the waterproof sleeve, and the protective plates cover the guide ribs.

11. The electrical connection assembly according to claim 1, wherein: The housing also includes an extension section and a locking arm, the extension section is located behind the docking section, the locking arm extends from the docking section to the extension section, the extension section has a rearwardly open accommodating cavity, the electrical connection component is connected to a cable in the accommodating cavity, the cable extends outward and beyond the accommodating cavity, a stress relief piece closes the rear end of the accommodating cavity, the stress relief piece has a sleeve portion for the cable to pass through, the sleeve portion extends rearward along the outer surface of the cable, a rear cover covers a portion of the extension section and a portion of the stress relief piece, the rear cover has a through hole for the sleeve portion and the cable to pass through.

12. An electrical connection assembly for connecting to a docking assembly, characterized in that: The invention comprises a housing having a docking section, wherein the docking section has a first docking cavity, the front end of the first docking cavity is open, the rear end of the first docking cavity has a rear wall surface, one side of the first docking cavity has a first side wall and a second side wall located on opposite sides of the electrical connection member, the second side wall and the first side wall are both connected to the rear wall surface, the first side wall has a glue injection hole communicating with the first docking cavity, the second side wall has a glue overflow groove recessed outward from the inner surface, and the glue overflow groove extends to the front end surface of the second side wall; a waterproof component, which is formed on the inner circumferential surface of the first docking cavity by injecting glue through the glue injection hole, and is used to abut the docking component to form a waterproof seal; an electrical connection component, which is located in the first docking cavity and is used to form an electrical connection with the docking component.

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