Charging base and toothbrush assembly

Abstract

The utility model discloses a charging base and a toothbrush assembly, and relates to the technical field of oral cavity cleaners, and the charging base is characterized in that a shell is provided with at least two charging parts; when the bottom plate is assembled to the shell, the first welding rib is jointed with the joint surface of the shell, and the second welding rib is jointed with the joint surface of the bottom plate; the charging assembly is arranged in the accommodating cavity. By arranging at least two charging parts, the limitation of single-machine charging of a traditional charging base is effectively solved, and the convenience of parallel charging of multiple devices is remarkably improved. A double ultrasonic line welding structure formed by the first welding rib and the second welding rib is adopted, multiple sealing barriers are formed through staggered welding to block a liquid permeation path, and the IPX7 waterproof standard is met under the condition of no glue pouring process. Compared with a traditional glue pouring process, the technical scheme has the advantages that the cost is saved, and meanwhile, the quality defects of bubbles, glue overflowing and the like possibly generated by the glue pouring process are avoided.

Description

Technical Field

[0001] This application relates to the field of oral hygiene device technology, and more particularly to a charging base and toothbrush assembly. Background Technology

[0002] With the widespread adoption of personal care electronic devices, electric toothbrushes, as frequently used oral care tools, have seen their functional integration and user experience optimization become key areas for product upgrades. The current market presents a dual, rigid demand for electric toothbrush charging systems: on the one hand, they must meet the simultaneous charging needs of multi-member households; on the other hand, they must ensure the long-term waterproof reliability (IPX7 standard) of the charging base in high-humidity environments such as bathrooms. However, existing technologies face significant technical bottlenecks in simultaneously meeting these two requirements.

[0003] Currently, most mainstream electric toothbrush charging bases use a single induction coil design, supporting only one toothbrush at a time, which cannot meet the needs of multiple family members. Meanwhile, traditional waterproofing solutions mainly rely on potting sealing, which involves injecting epoxy resin or other colloids into the charging base shell for sealing. These colloids are prone to micro-cracks under temperature cycling, causing waterproofing performance to degrade over time. Furthermore, the potting process requires specialized equipment and manual calibration, increasing production costs. Under the current technological system, multi-device charging and high-reliability waterproofing present an irreconcilable contradiction: adopting a multi-coil solution further increases the cost of the potting process; simplifying the waterproofing structure makes it difficult to meet the IPX7 standard. Therefore, there is an urgent need for a highly waterproof charging base that can simultaneously charge multiple devices in parallel without relying on potting sealing. Utility Model Content

[0004] The main purpose of this application is to provide a charging base and toothbrush assembly, which aims to solve the technical problem of high waterproofness of traditional electric toothbrush charging bases that can simultaneously charge multiple devices in parallel without relying on potting and sealing processes.

[0005] To achieve the above objectives, this application proposes a charging base for charging an electric toothbrush, the charging base comprising:

[0006] The housing is provided with at least two charging sections, each of which is used to hold an electric toothbrush to be charged;

[0007] A base plate, which is connected to the housing and forms an accommodating cavity;

[0008] The first welding rib is disposed on the side of the base plate near the shell;

[0009] The second welding rib is disposed on the side of the housing near the bottom plate. When the bottom plate is assembled to the housing, the first welding rib engages with the mating surface of the housing, and the second welding rib engages with the mating surface of the bottom plate, so that the accommodating cavity forms a sealed accommodating space.

[0010] A charging component is disposed within the accommodating cavity, the charging component being used to charge an electric toothbrush placed in the charging section.

[0011] In one embodiment, the charging assembly includes:

[0012] At least two charging units, each of which is positioned corresponding to a charging section.

[0013] In one embodiment, the charging unit includes:

[0014] A charging slot is provided on the surface of the housing, the charging slot being used to accommodate an electric toothbrush;

[0015] A fixing post is installed inside the charging slot, and the fixing post is adapted to the fixing slot of the electric toothbrush.

[0016] In one embodiment, the bottom wall of the charging tank extends toward the side facing the base plate to form a drain pipe, and the base plate has a drain outlet that matches the tubular structure, and the drain outlet is connected to the drain pipe.

[0017] In one embodiment, the first weld bead and the second weld bead form a closed ring structure:

[0018] The first welding rib is located at the edge of the base plate near the shell, or at the edge of the drain outlet near the drain pipe.

[0019] The second welding rib is disposed at the edge of the housing near the bottom plate, or at the edge of the drain pipe near the drain outlet.

[0020] In one embodiment, the housing has a first mating surface that matches the first welding rib on the side near the bottom plate;

[0021] The bottom plate is provided with a second mating surface that matches the second welding rib on the side near the housing. The first welding rib and the first mating surface, and the second welding rib and the second mating surface are mated to form a sealed connection.

[0022] In one embodiment, the first mating surface and the second mating surface are staggered on a vertical plane.

[0023] In one embodiment, the charging unit includes a wireless charging coil or a contact electrode.

[0024] In addition, to achieve the above objectives, this application also proposes a toothbrush assembly, including an electric toothbrush, a replacement toothbrush head, and a charging base as described above.

[0025] In one embodiment, the housing is provided with at least two replacement sections for holding replacement toothbrush heads.

[0026] One or more technical solutions proposed in this application have at least the following technical effects:

[0027] This application effectively addresses the limitations of traditional charging docks for single-device charging by incorporating at least two charging sections, significantly improving the convenience of parallel charging for multiple devices. It employs a double ultrasonic line welding structure composed of a first and second welding rib, creating multiple sealing barriers through staggered welding to block liquid penetration, achieving IPX7 waterproofing without the need for potting. This technical solution saves costs compared to traditional potting processes while avoiding quality defects such as bubbles and excess adhesive that may occur with potting. Attached Figure Description

[0028] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0029] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a structural diagram of a toothbrush assembly according to this application;

[0031] Figure 2 This is an internal structural diagram of a charging dock according to this application;

[0032] Figure 3 This is another view of the internal structure of a charging dock according to this application;

[0033] Figure 4 This is a cross-sectional view of a charging dock according to this application;

[0034] Figure 5 for Figure 2 A magnified view of part of AA;

[0035] Figure 6 for Figure 3 A magnified view of a portion of BB.

[0036] Reference numerals: housing 01, charging part 11, charging slot 12, fixing post 13, drain pipe 14, replacement part 15, base plate 02, drain outlet 21, first welding rib 03, second welding rib 04, charging assembly 05, first mating surface 06, second mating surface 07, electric toothbrush 08, replacement toothbrush head 09.

[0037] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0038] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0039] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0040] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, if the word "and / or" appears throughout the text, it means including three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution that simultaneously satisfies A and B. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0041] With the widespread adoption of personal care electronic devices, the electric toothbrush 08, as a frequently used oral care tool, has seen its functional integration and user experience optimization become key areas for product upgrades. The current market presents two rigid demands on the electric toothbrush 08's charging system: on the one hand, it must meet the simultaneous charging needs of multi-member households; on the other hand, it must ensure the long-term waterproof reliability of the charging base in high-humidity environments such as bathrooms (IPX7 standard, meaning the device can be submerged in 1 meter of water for 30 minutes without being affected). However, existing technologies face significant technical bottlenecks in simultaneously meeting these two requirements.

[0042] Currently, most mainstream electric toothbrush charging bases use a single induction coil design, supporting only one toothbrush at a time, which cannot meet the needs of multiple family members. Meanwhile, traditional waterproofing solutions mainly rely on potting sealing, which involves injecting epoxy resin or other colloids into the charging base housing to achieve a seal. These colloids are prone to micro-cracks under temperature cycling, causing waterproofing performance to degrade over time. Furthermore, the potting process requires specialized equipment and manual calibration, increasing production costs. Under the current technological system, multi-device charging and high-reliability waterproofing present an irreconcilable contradiction: adopting a multi-coil solution further increases the cost of the potting process; simplifying the waterproofing structure makes it difficult to meet the IPX7 standard.

[0043] Therefore, this application proposes a charging base for charging the electric toothbrush 08. Please refer to... Figures 1 to 3 The charging dock includes:

[0044] The housing 01 is provided with at least two charging sections 11, each of which is used to hold an electric toothbrush 08 to be charged;

[0045] Base plate 02, which is connected to the housing 01 and forms an accommodating cavity;

[0046] The first welding rib 03 is disposed on the side of the base plate 02 near the shell 01;

[0047] The second welding rib 04 is disposed on the side of the housing 01 near the bottom plate 02. When the bottom plate 02 is assembled to the housing 01, the first welding rib 03 engages with the mating surface of the housing 01, and the second welding rib 04 engages with the mating surface of the bottom plate 02, so that the accommodating cavity forms a sealed accommodating space.

[0048] A charging component 05 is disposed within the accommodating cavity, and the charging component 05 is used to charge the electric toothbrush 08 placed in the charging section 11.

[0049] More specifically, this application first addresses the needs of multi-member families. The charging base consists of a housing 01 and a base plate 02. The housing 01 contains at least two charging sections 11, each designed with a shape and size suitable for placing an electric toothbrush 08, ensuring that the electric toothbrush 08 can be stably placed on the charging section 11. This design allows the charging base to simultaneously charge two or more electric toothbrushes 08, enabling parallel charging of multiple devices, improving charging efficiency and user convenience. The base plate 02 is connected to the housing 01, forming a cavity to house the charging component 05 and other necessary electronic components. When the electric toothbrush 08 is placed on the charging section 11, the charging component 05 charges the electric toothbrush 08 via wired or wireless means.

[0050] However, the traditional waterproofing solutions mentioned above mainly rely on potting sealing processes, that is, injecting epoxy resin or other colloids into the charging base housing 01 to achieve a seal. Epoxy resin and other colloids are prone to developing microcracks under long-term temperature cycling. These microcracks gradually expand, leading to a decrease in sealing performance and a weakening of the waterproofing effect. Over time, the colloid itself also ages, its elasticity and sealing performance gradually decrease, further affecting the waterproofing effect.

[0051] Furthermore, the dispensing process requires specialized equipment and tools, such as dispensing machines and metering pumps. The purchase and maintenance costs of this equipment are relatively high, and manual calibration and operation are necessary during the dispensing process to ensure uniform distribution of the adhesive and a sealing effect. This not only increases labor costs but may also lead to unstable product quality due to improper operation. The multi-charging unit 11 in this application further increases the cost of the dispensing process, thus making it impossible to achieve simultaneous charging of multiple devices while ensuring waterproofing using traditional dispensing and sealing techniques.

[0052] To address the aforementioned issues, this application incorporates welding ribs between the shell 01 and the base plate 02, employing ultrasonic welding technology to generate heat through high-frequency vibration, thereby fusing the materials and avoiding the use of colloidal materials. However, considering that traditional single-layer ultrasonic structures may only have one welding line, single-line welding is extremely sensitive to process parameters (pressure, frequency, temperature), and even minor deviations can easily lead to seal failure. In other words, imperfect welding or material defects can easily result in waterproofing failure. Material aging or mechanical stress may induce microcracks, making single-layer protection insufficient to address the risk of water leakage during long-term use.

[0053] Therefore, this application employs a dual ultrasonic line, using a redundant sealing mechanism to form a physical barrier through two ultrasonic welding lines. Even if a single line has minor defects (such as material inhomogeneity or fluctuations in welding parameters), the second weld can still prevent moisture penetration. Simultaneously, this application optimizes the welding structure of the shell 01 and base plate 02 by setting welding ribs on both the shell 01 and base plate 02. The welding ribs are raised structures that melt and join with the mating surface during ultrasonic welding. When the base plate 02 is assembled to the shell 01, the first welding rib 03 on the side of the base plate 02 near the shell 01 engages with the mating surface of the shell 01, and the second welding rib 04 on the side of the shell 01 near the base plate 02 engages with the mating surface of the base plate 02, thus forming a sealed accommodating space. The first welding rib 03 and the second welding rib 04 ensure sufficient material flow during the fusion process of the shell 01 and base plate 02, filling gaps and avoiding sealing failure caused by stress concentration in traditional single-line welding.

[0054] This application effectively solves the limitations of traditional charging docks for single-device charging by setting at least two charging sections 11, significantly improving the convenience of parallel charging of multiple devices. It employs a double ultrasonic line welding structure composed of a first welding rib 03 and a second welding rib 04, forming multiple sealing barriers through staggered welding to block liquid penetration paths, meeting the IPX7 waterproof standard without the need for potting. This technical solution saves costs compared to traditional potting processes, while avoiding quality defects such as bubbles and excess adhesive that may occur with potting.

[0055] In one embodiment, the charging component 05 includes:

[0056] At least two charging units, each of which is positioned corresponding to one of the charging sections 11.

[0057] The charging assembly 05 contains at least two charging units to meet the basic requirements of a multi-charging unit 11 design. In practical applications, the number of charging units can be flexibly adjusted according to the number of charging units 11. Each charging unit corresponds to a specific charging unit 11. This one-to-one correspondence ensures that each charging unit 11 receives appropriate power output and control, avoiding waste of power resources and potential safety risks during the charging process. Since each charging unit is independent, they can independently output and control power. This means that even if one charging unit fails, it will not affect the normal operation of other charging units. This design improves the reliability and stability of the entire charging assembly 05.

[0058] In one embodiment, please refer to Figure 2 The charging unit 11 includes:

[0059] A charging slot 12 is disposed on the surface of the housing 01, and the charging slot 12 is used to accommodate the electric toothbrush 08; a fixing post 13 is disposed in the charging slot 12, and the fixing post 13 is adapted to the fixing slot of the electric toothbrush 08.

[0060] The charging slot 12 is located on the surface of the housing 01. Its shape and size must perfectly accommodate the bottom of the electric toothbrush 08. The depth of the charging slot 12 is moderate, providing both secure support for the electric toothbrush 08 and easy insertion and removal by the user. A fixing post 13 is installed inside the charging slot 12. When the electric toothbrush 08 is placed in the charging slot 12, the fixing post 13 inserts into the fixing slot of the electric toothbrush 08, providing additional fixation and support to prevent the electric toothbrush 08 from shaking or falling off during charging, ensuring charging stability and safety.

[0061] In one embodiment, please refer to Figure 3 and Figure 4 The bottom wall of the charging slot 12 extends toward the side facing the base plate 02 to form a drain pipe 14. The base plate 02 has a drain outlet 21 that matches the tubular structure. The drain outlet 21 is connected to the drain pipe 14.

[0062] The bottom wall of the charging tank 12 is designed with a drain pipe 14 extending towards the bottom plate 02. Its function is to collect and guide any water that may enter the charging tank 12. The design of the drain pipe 14 needs to consider the requirements of drainage efficiency and prevention of water backflow. Its inner diameter is large enough to ensure that water can flow out smoothly; at the same time, the end of the drain pipe 14 (i.e., the side near the bottom plate 02) can be optionally equipped with a device to prevent water backflow, such as a one-way valve or an inclined angle.

[0063] The base plate 02 has a drain port 21 that matches the drain pipe 14. The shape and size of this drain port 21 match the drain pipe 14 to ensure that the drain pipe 14 can be accurately inserted into it to form a tight connection. The drain port 21 is usually designed to be located at the edge or bottom of the base plate 02 so that the collected water can be smoothly drained from the charging base, avoiding safety hazards caused by water accumulation.

[0064] The drain pipe 14 and the drain outlet 21 are kept in communication. When water enters the charging tank 12, it flows along the drain pipe 14 and eventually exits the charging base through the drain outlet 21, ensuring that even if water is accidentally splashed into the charging tank 12, the water can be quickly drained, thereby protecting the charging component 05 and the electric toothbrush 08 from damage.

[0065] In one embodiment, please refer to Figure 4The first welding rib 03 and the second welding rib 04 form a closed ring structure, meaning that a continuous sealing band is formed at the connection between the shell 01 and the base plate 02, effectively preventing the penetration of moisture or other liquids, thus ensuring the waterproofness of the entire structure. This avoids the situation where welding ribs are lacking in some areas. In traditional designs, if the welding ribs are unevenly distributed or missing, potential leakage points may form in these unprotected areas. The closed ring structure ensures that all connection areas are adequately protected by welding ribs.

[0066] Please refer to Figure 2 and Figure 5 The diagrams illustrate the position and layout of the first welding rib 03 and its corresponding first mating surface 06. By observing these diagrams, it is clear how the first welding rib 03 is positioned at the edge of the base plate 02 or the drain outlet 21, and matches the first mating surface 06 on the housing 01. The first welding rib 03 is located at the edge of the base plate 02 near the housing 01, or at the edge of the drain outlet 21 near the drain pipe 14. The housing 01 has a first mating surface 06 on the side near the base plate 02 that matches the first welding rib 03.

[0067] Please refer to Figure 3 and Figure 6 The diagrams illustrate the position and layout of the second welding rib 04 and its corresponding second mating surface 07. Similarly, these diagrams help us understand how the second welding rib 04 is positioned at the edge of the housing 01 or drain pipe 14 and matches the second mating surface 07 on the base plate 02. The second welding rib 04 is positioned at the edge of the housing 01 near the base plate 02, or at the edge of the drain pipe 14 near the drain outlet 21. The base plate 02 has a second mating surface 07 on the side near the housing 01 that matches the second welding rib 04. The first welding rib 03 and the first mating surface 06, and the second welding rib 04 and the second mating surface 07, are joined to form a sealed connection. The first welding rib 03 and the second welding rib 04 are positioned at each connection between the housing 01 and the base plate 02, ensuring a high degree of waterproofing at the connection between the housing 01 and the base plate 02 (or the drain outlet 21 and the drain pipe 14).

[0068] In one embodiment, the first mating surface 06 and the second mating surface 07 are staggered on the vertical plane. This means that the first mating surface 06 and the second mating surface 07 are not perfectly aligned in the vertical direction, but rather have a certain offset or stagger. Consequently, the sealing connection formed by the first welding rib 03 and the first mating surface 06, and the second welding rib 04 and the second mating surface 07, is not aligned on the vertical plane.

[0069] The staggered arrangement of weld ribs and joint surfaces disperses stress under load, reducing the likelihood of single-point stress. This design helps improve the overall strength and stability of the structure, especially under significant pressure or vibration. The staggered arrangement also helps reduce defects that may occur during welding, such as porosity, cracks, or lack of fusion. This is because the staggered arrangement provides better molten pool flow and a more uniform heat distribution, thereby improving weld quality and further enhancing water resistance.

[0070] In one embodiment, the charging unit includes a wireless charging coil or contact electrodes. The charging unit is a key component in an electronic device for receiving or transmitting electrical energy for charging. In the current embodiment, the charging unit is designed to include either a wireless charging coil or contact electrodes, representing two mainstream technologies: wireless charging and contact charging, respectively.

[0071] Wireless charging coils typically operate on the principle of electromagnetic induction. When the electric toothbrush 08 is placed on the charging section 11 of the wireless base, the charger's wireless charging coil generates a changing magnetic field. This magnetic field induces a current in the wireless charging coil inside the device, thereby charging the device.

[0072] The wireless charging coil design makes the charging process more convenient and flexible, allowing users to charge without inserting a charging cable. Furthermore, the wireless charging coil avoids the wear and tear and damage to the interface caused by frequent plugging and unplugging of charging cables.

[0073] Contact electrodes achieve charging through physical contact. During charging, the device's charging port and the charger's charging head are tightly connected via contact electrodes, forming a conductive path. Current flows through this path from the charger to the device, thus charging it.

[0074] The contact electrode design offers higher charging efficiency and more stable charging performance. Because current is transferred directly to the device through the contact electrodes, charging speeds are typically faster than wireless charging. Furthermore, contact electrodes provide a more reliable electrical connection, reducing magnetic field interference and energy loss issues that can occur during wireless charging.

[0075] In addition, to achieve the above objectives, this application also proposes a toothbrush assembly, please refer to... Figure 1The device includes an electric toothbrush 08, a replacement toothbrush head 09, and a charging base as described above. The charging base includes a housing 01 with at least two charging sections 11, each of which holds the electric toothbrush 08 to be charged; a base plate 02 connected to the housing 01 to form a receiving cavity; a first welding rib 03 located on the side of the base plate 02 near the housing 01; and a second welding rib 04 located on the side of the housing 01 near the base plate 02. When the base plate 02 is assembled to the housing 01, the first welding rib 03 engages with the mating surface of the housing 01, and the second welding rib 04 engages with the mating surface of the base plate 02, thereby forming a sealed receiving space within the receiving cavity; and a charging assembly 05 disposed within the receiving cavity, used to charge the electric toothbrush 08 placed in the charging section 11.

[0076] This application effectively solves the limitations of traditional charging docks for single-device charging by setting at least two charging sections 11, significantly improving the convenience of parallel charging of multiple devices. It employs a double ultrasonic line welding structure composed of a first welding rib 03 and a second welding rib 04, forming multiple sealing barriers through staggered welding to block liquid penetration paths, meeting the IPX7 waterproof standard without the need for potting. This technical solution saves costs compared to traditional potting processes, while avoiding quality defects such as bubbles and excess adhesive that may occur with potting.

[0077] In one embodiment, please refer to Figure 1 The housing 01 is provided with at least two replacement sections 15 for holding replacement toothbrush heads 09. The presence of the replacement sections 15 allows users to easily select and replace the replacement toothbrush heads 09 according to actual usage. This helps improve the hygiene and lifespan of the toothbrush, while also providing greater convenience for the user. At the same time, the layout of the replacement sections 15 on the housing 01 should be reasonable, ensuring that users can easily access and replace the replacement toothbrush heads 09 while avoiding occupying too much space or affecting the overall aesthetics of the housing 01.

[0078] The above embodiments are merely preferred embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A charging base for charging an electric toothbrush, characterized in that, The charging dock includes: The housing is provided with at least two charging sections, each of which is used to hold an electric toothbrush to be charged; A base plate, which is connected to the housing and forms an accommodating cavity; The first welding rib is disposed on the side of the base plate near the shell; The second welding rib is disposed on the side of the housing near the bottom plate. When the bottom plate is assembled to the housing, the first welding rib engages with the mating surface of the housing, and the second welding rib engages with the mating surface of the bottom plate, so that the accommodating cavity forms a sealed accommodating space. A charging component is disposed within the accommodating cavity, the charging component being used to charge an electric toothbrush placed in the charging section.

2. The charging dock as described in claim 1, characterized in that, The charging component includes: At least two charging units, each of which is positioned corresponding to a charging section.

3. The charging dock as described in claim 1, characterized in that, The charging unit includes: A charging slot is provided on the surface of the housing, the charging slot being used to accommodate an electric toothbrush; A fixing post is installed inside the charging slot, and the fixing post is adapted to the fixing slot of the electric toothbrush.

4. The charging dock as described in claim 3, characterized in that, The bottom wall of the charging slot extends toward the side facing the base plate to form a drain pipe, and the base plate has a drain outlet that matches the drain pipe, and the drain outlet is connected to the drain pipe.

5. The charging dock as described in claim 4, characterized in that, The first and second weld ribs form a closed ring structure: The first welding rib is located at the edge of the base plate near the shell, or at the edge of the drain outlet near the drain pipe. The second welding rib is disposed at the edge of the housing near the bottom plate, or at the edge of the drain pipe near the drain outlet.

6. The charging dock as described in claim 1, characterized in that, The housing has a first mating surface that matches the first welding rib on the side near the bottom plate; The bottom plate is provided with a second mating surface that matches the second welding rib on the side near the housing. The first welding rib and the first mating surface, and the second welding rib and the second mating surface are mated to form a sealed connection.

7. The charging dock as described in claim 6, characterized in that, The first mating surface and the second mating surface are staggered on a vertical plane.

8. The charging dock as described in claim 2, characterized in that, The charging unit includes a wireless charging coil or a contact electrode.

9. A toothbrush assembly, characterized in that, Includes an electric toothbrush, a replacement toothbrush head, and a charging base as described in any one of claims 1-8.

10. The toothbrush assembly as claimed in claim 9, characterized in that, The housing is provided with at least two replacement sections for holding replacement toothbrush heads.

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