Bottom cover assembly of electric toothbrush, toothbrush handle and electric toothbrush

Abstract

The embodiment of the utility model discloses a bottom cover assembly of an electric toothbrush, a toothbrush handle and the electric toothbrush, and the bottom cover assembly of the electric toothbrush comprises a bottom shell and a moisture absorption assembly; the bottom shell is used for covering the lower end opening of the brush handle shell, and the bottom shell is provided with an inner mounting surface communicated with the inner cavity of the brush handle shell; the moisture absorption assembly is installed on the inner installation face so as to be used for absorbing water vapor in the inner cavity of the brush handle shell. After the bottom cover assembly of the electric toothbrush is assembled to the brush handle shell, the moisture absorption assembly on the bottom shell can effectively absorb moisture in residual air in the inner cavity of the brush handle shell, so that the inner cavity of the brush handle shell is ensured to be dry, and electronic elements in the brush handle shell are prevented from being damped and damaged due to evaporation of the moisture.

Description

Technical Field

[0001] The present application relates to the technical field of electric toothbrushes, and in particular to a bottom cover assembly of an electric toothbrush, a toothbrush handle and an electric toothbrush. Background Art

[0002] An electric toothbrush is an important tool for modern oral hygiene. It uses electricity to drive the bristles to vibrate or rotate to achieve the effect of cleaning the teeth and mouth. Electric toothbrushes are becoming more and more popular with users due to their strong cleaning power, high cleaning efficiency, and uniform brushing force. In order to facilitate the assembly of the internal structure of the toothbrush handle, in the related art, the lower end of the handle shell is opened. After the internal structure of the handle shell is assembled in place, the bottom shell is sealed to cover the lower end opening of the handle shell. Since the inner cavity of the handle shell is not vacuumed, there will always be residual air. The electric toothbrush will heat up when it is working continuously. Once heat is generated inside the handle shell, the water vapor in the internal air will evaporate and concentrate, which can easily cause the electronic components inside the handle shell to become damp and damaged.

[0003] The above content is only used to assist in understanding the technical solution of the utility model and does not constitute an admission that the above content is prior art. Utility Model Content

[0004] In view of the above problems, the present invention proposes a bottom cover assembly for an electric toothbrush, aiming to solve the technical problem that residual air inside the brush handle housing easily causes damage to electronic components due to moisture.

[0005] To achieve the above-mentioned purpose, the bottom cover assembly of the electric toothbrush proposed in the present invention includes a bottom shell and a moisture absorption assembly;

[0006] The bottom shell is used to cover the lower end opening of the brush handle housing, and the bottom shell has an inner mounting surface communicating with the inner cavity of the brush handle housing;

[0007] The moisture absorption component is installed on the inner installation surface to absorb water vapor in the inner cavity of the brush handle shell.

[0008] In one embodiment, the moisture absorption component and the bottom shell are fixedly connected by at least one of bonding, embedding, clamping, welding, and injection molding.

[0009] In one embodiment, the bottom shell includes a bottom wall and a surrounding wall connected to each other; the bottom wall is used to cover the lower end opening of the brush handle shell; the surrounding wall is used to be embedded in the inner cavity of the brush handle shell; the bottom wall and the surrounding wall together form an installation cavity with an open upper end and connected to the inner cavity of the brush handle shell, and the inner wall surface of the installation cavity forms the inner installation surface.

[0010] In one embodiment, the desiccant assembly is arranged on the bottom surface of the mounting cavity; the bottom cover assembly of the electric toothbrush further comprises a pressing plate, which is pressed onto the top of the desiccant assembly and fixedly connected to the bottom shell.

[0011] In one embodiment, the bottom cover assembly of the electric toothbrush also includes a charging coil, which is installed on the bottom surface of the installation cavity; the moisture absorption assembly is clamped between the charging coil and the surrounding wall; and the pressure plate is pressed on top of the charging coil.

[0012] In one embodiment, the bottom cover assembly of the electric toothbrush further includes a charging assembly, which is installed on the bottom surface of the installation cavity; and the moisture absorption assembly is sandwiched between the charging assembly and the surrounding wall.

[0013] In one embodiment, the moisture absorption component includes a plurality of adsorbents, and the plurality of adsorbents are arranged along the circumference of the charging component.

[0014] In one embodiment, a plurality of partitions are protruding from the bottom surface of the installation cavity and located between the surrounding wall and the charging component. The plurality of partitions are arranged at circumferential intervals around the charging component, and each of the adsorption components is limited to the upper limit of the circumference around the charging component and stops at the partition.

[0015] In one embodiment, the bottom cover assembly of the electric toothbrush further includes at least two magnetic components, which extend along the circumference of the charging assembly and are clamped between the charging assembly and the surrounding wall, and each of the magnetic components is arranged between two adjacent partitions; a plurality of the magnetic components and a plurality of the adsorption components are arranged in sequence in the circumference of the charging assembly.

[0016] In one embodiment, the charging assembly includes a charging coil, a hollow area is formed in the middle of the charging coil, and at least one of the adsorption components is provided in the hollow area.

[0017] In one embodiment, an annular flange is protruding from the middle of the bottom wall of the installation cavity, the charging coil is sleeved outside the annular flange, and at least one adsorption member is provided in the middle of the annular flange.

[0018] In one embodiment, the moisture absorbing component comprises a plurality of zeolites.

[0019] The present invention also proposes a toothbrush handle, comprising a handle shell and a bottom cover assembly of the electric toothbrush as described in any of the above embodiments; the lower end of the handle shell is provided with an opening connected to its inner cavity, and the bottom shell of the bottom cover assembly of the electric toothbrush is installed at the opening.

[0020] The utility model also provides an electric toothbrush, comprising a brush head and the toothbrush handle connected to each other.

[0021] The bottom cover assembly of the electric toothbrush of this utility model is provided with a moisture-absorbing component, which can effectively absorb moisture remaining in the air in the inner cavity of the handle housing, thereby preventing moisture evaporation from the air inside the handle housing when the electric toothbrush is running and heating up, which could cause damage to the electronic components. Furthermore, the moisture-absorbing component is arranged on the bottom shell, which is easier to install and fix than to install the moisture-absorbing component on other components within the handle housing. The moisture-absorbing component can be integrally assembled with the bottom shell to the handle housing. Furthermore, because the bottom shell is located at the bottom of the entire electric toothbrush, the moisture-absorbing component can be prevented from loosening and falling due to long-term vibration, which could affect the operation of the electronic components within the toothbrush handle. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0023] Figure 1 Shows a structural schematic diagram of an embodiment of a bottom cover assembly of an electric toothbrush of the present utility model;

[0024] Figure 2 for Figure 1 A schematic diagram of the exploded structure of the bottom cover assembly of the electric toothbrush;

[0025] Figure 3 This is a structural schematic diagram of another embodiment of the bottom cover assembly of the electric toothbrush of the present utility model;

[0026] Figure 4 for Figure 3 A top view of the bottom cover assembly of the electric toothbrush;

[0027] Figure 5 This is a structural diagram of an embodiment of a toothbrush handle of the present invention;

[0028] Figure 6 for Figure 5 A cross-sectional view of the toothbrush handle at one angle;

[0029] Figure 7 for Figure 6 A partial enlarged view of point A in the middle;

[0030] Figure 8 for Figure 6 A partial schematic diagram of the bottom cover assembly and handle shell of the middle toothbrush handle after decomposition.

[0031] Description of Figure Numbers:

[0032]

[0033]

[0034] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by this utility model.

[0036] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0037] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features specified as "first" or "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing throughout the text is to include three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that meet both A and B.

[0038] The utility model provides a bottom cover assembly of an electric toothbrush, which is used for being installed at the lower end opening of a brush handle housing.

[0039] In the embodiment of this utility model, please refer to Figures 1 to 6 The bottom cover assembly 100 of the electric toothbrush includes a bottom shell 110 and a moisture absorption assembly 120; the bottom shell 110 is used to cover the lower end opening 210 of the brush handle shell 200, and the bottom shell 110 has an inner mounting surface 101 connected to the inner cavity of the brush handle shell 200; the moisture absorption assembly 120 is installed on the inner mounting surface 101 to absorb water vapor in the inner cavity of the brush handle shell 200.

[0040] In this embodiment, the bottom shell 110 can have a variety of shapes, generally matching the cross-sectional shape of the handle housing 200. For example, the outer contour of the bottom shell 110 can be circular, elliptical, rounded-corner triangular, heart-shaped, etc., and the overall shape of the bottom shell 110 is not specifically limited herein. The bottom shell 110 can include only the bottom wall 111 or both the bottom wall 111 and the surrounding wall 112. The specific structure of the bottom shell 110 can be selected and designed based on actual needs, as long as it can be connected to the handle housing 200 and cover the lower end opening 210 of the handle housing 200.

[0041] The inner mounting surface 101 of the bottom shell 110 is in communication with the inner cavity of the handle housing 200. That is, when the bottom shell 110 is mounted to the lower opening 210 of the handle housing 200, the inner mounting surface 101 on the bottom shell 110 and the inner cavity of the handle housing 200 together enclose a closed cavity. The specific position of the inner mounting surface 101 is determined based on the specific shape of the bottom shell 110 and the connection method between the bottom shell 110 and the handle housing 200. For example, when the bottom shell 110 only includes a bottom wall 111, the inner mounting surface 101 is formed on the inner wall surface of the bottom wall 111. When the bottom shell 110 includes a bottom wall 111 and a surrounding wall 112, and the surrounding wall 112 is embedded in the inner cavity of the handle housing 200, the inner wall surfaces of both the bottom wall 111 and the surrounding wall 112 can form the inner mounting surface 101. The moisture absorbing component 120 can be fixed to the inner wall surface of the bottom wall 111 , the surrounding wall 112 , or the connection between the inner wall surfaces of the bottom wall 111 and the surrounding wall 112 .

[0042] There can be many types of desiccant components 120. For example, the desiccant component 120 may include one or more of zeolite, fiber desiccant, silica gel desiccant, activated carbon, calcium chloride, and water-absorbing resin. In a specific embodiment, the desiccant component 120 includes a plurality of zeolites. The desiccant component 120 includes a plurality of zeolites, which can enhance water absorption without swelling, thereby improving the installation stability of the zeolite. Zeolite is a natural adsorption material that is non-toxic and harmless. In addition to absorbing water, it can also absorb a variety of harmful substances, making it more environmentally friendly and reliable to use. In addition, zeolite can be processed into various shapes and sizes according to usage requirements. Compared with other desiccant components, it can better adapt to the complex space inside the bottom shell 110 of the electric toothbrush.

[0043] The number and size of the moisture absorbing components 120 can also be selected based on the space within the bottom shell 110. By mounting the moisture absorbing components 120 on the inner mounting surface 101 of the bottom shell 110, after the bottom shell 110 is mounted on the handle housing 200, the moisture absorbing components 120 can be located within the inner cavity of the handle housing 200, thereby absorbing residual moisture within the inner cavity of the handle housing 200. The moisture absorbing components 120 can be secured to the inner mounting surface 101 by bonding, crimping, or pressing with the pressure plate 130. In one embodiment, the moisture absorbing components 120 are secured to the bottom shell 110 by at least one of bonding, crimping, snapping, welding, and injection molding. It is understood that when the bottom shell 110 is made of plastic, the moisture absorbing components 120 can be secured to the bottom shell 110 by welding or injection molding. These securing methods can enhance the stability of the connection between the moisture absorbing components 120 and the bottom shell 110.

[0044] The bottom cover assembly 100 of the electric toothbrush of the present invention is provided with a moisture absorbing assembly 120, which can effectively absorb moisture remaining in the air in the inner cavity of the handle housing 200, thereby preventing moisture evaporation in the air inside the handle housing 200 after the electric toothbrush is heated during operation, which may cause damage to the electronic components. Furthermore, the moisture absorbing assembly 120 is arranged on the bottom shell 110. Compared with installing the moisture absorbing assembly 120 on other components within the handle housing 200, it is easier to install and fix the moisture absorbing assembly 120, allowing the moisture absorbing assembly 120 and the bottom shell 110 to be integrally assembled to the handle housing 200. Furthermore, because the bottom shell 110 is located at the bottom of the entire electric toothbrush, the moisture absorbing assembly 120 can be prevented from loosening and falling due to long-term vibration, which could affect the operation of the electronic components within the toothbrush handle 10.

[0045] In one embodiment, if Figures 1 to 3 、 Figures 6 to 8 As shown, the bottom shell 110 includes a bottom wall 111 and a surrounding wall 112 that are connected to each other; the bottom wall 111 is used to cover the lower end opening 210 of the brush handle shell 200; the surrounding wall 112 is used to be embedded in the inner cavity of the brush handle shell 200; the bottom wall 111 and the surrounding wall 112 enclose a mounting cavity 113 with an open upper end and connected to the inner cavity of the brush handle shell 200, and the inner wall surface of the mounting cavity 113 forms an inner mounting surface 101.

[0046] In this embodiment, a structure such as a snap-on arm can be provided on the surrounding wall 112 to engage and secure the handle housing 200. Typically, a sealing ring is embedded in the outer periphery of the surrounding wall 112. When the surrounding wall 112 is embedded in the handle housing 200, the sealing ring effectively seals the handle housing 200 and the bottom shell 110, preventing external water or other liquids from entering the handle housing 200. The bottom wall 111 of the bottom shell 110 and the surrounding wall 112 together form a mounting cavity 113 with an open top end that communicates with the handle housing 200. The inner wall surface of the mounting cavity 113 forms the inner mounting surface 101. The moisture absorbing assembly 120 is then installed in the mounting cavity 113, which limits the moisture absorbing assembly 120 in the lateral direction, effectively reducing the difficulty of securing the moisture absorbing assembly 120 to the bottom shell 110.

[0047] In one embodiment, please refer to Figure 1 、 Figure 2 、 Figures 6 to 8 , the desiccant assembly 120 is arranged on the bottom surface of the mounting cavity 113 ; the bottom cover assembly 100 of the electric toothbrush further includes a pressing plate 130 , which is pressed onto the top of the desiccant assembly 120 and fixedly connected to the bottom shell 110 .

[0048] In this embodiment, the pressing plate 130 can be fixedly connected to the bottom shell 110 via screws, snap-fitting, or other methods. The pressing plate 130 can have a variety of shapes and sizes, as long as it can pressurize the desiccant assembly 120. The shape and size of the pressing plate 130 are not specifically limited herein. By providing the pressing plate 130 to press the desiccant assembly 120 between the bottom wall 111 of the bottom shell 110 and the pressing plate 130, the desiccant assembly 120 can be effectively prevented from vertically separating from the bottom shell 110. Combined with the lateral positioning of the desiccant assembly 120 by the surrounding wall 112, the desiccant assembly 120 is more securely secured to the bottom shell 110. Furthermore, the desiccant assembly 120 is secured within the mounting cavity 113 via the pressing plate 130, which significantly reduces the difficulty of securing the desiccant assembly 120 and improves connection reliability compared to securing the desiccant assembly 120 within the mounting cavity 113 via adhesive bonding or other methods.

[0049] Further, if Figures 2 to 4 、 Figure 7 and Figure 8 As shown, the bottom cover assembly 100 of the electric toothbrush also includes a charging coil, which is installed on the bottom surface of the installation cavity 113; the moisture absorption assembly 120 is sandwiched between the charging coil and the surrounding wall 112; and the pressure plate 130 is pressed on top of the charging coil.

[0050] In this embodiment, the pressure plate 130 can be a fixed bracket for pressing the charging coil, or it can be a circuit board for the charging coil. If the bottom cover assembly 100 includes a charging coil, the charging coil can perform electromagnetic transmission with the transmitting coil in the external charging base to realize the wireless charging function of the electric toothbrush. The pressure plate 130 is pressed on top of the charging coil, that is, the pressure plate 130 can serve as a pressing member for the charging coil. In this way, the pressure plate 130 is used to simultaneously press the charging coil and the moisture absorption component 120, which can simplify the internal structure of the bottom shell 110. The moisture absorption component 120 is sandwiched between the outer periphery of the charging coil and the surrounding wall 112, making full use of the space around the charging coil to install the moisture absorption component 120, which can make the structure of the entire bottom cover assembly 100 more compact and occupy less space, thereby facilitating the miniaturization of the electric toothbrush.

[0051] In one embodiment, the bottom cover assembly 100 of the electric toothbrush further includes a charging assembly 140, which is mounted on the bottom surface of the mounting cavity 113; the moisture absorption assembly 120 is sandwiched between the charging assembly 140 and the surrounding wall 112. The charging assembly 140 can specifically be a wireless charging coil, allowing the electric toothbrush to be wirelessly charged with an external charging station; the charging assembly 140 can also be a charging socket with a charging port, allowing the electric toothbrush to be plugged and electrically connected to the external charging station. By sandwiching the moisture absorption assembly 120 between the charging assembly 140 and the surrounding wall 112 and fully utilizing the space around the charging assembly 140 to install the moisture absorption assembly 120, the structure of the entire bottom cover assembly 100 can be made more compact and occupy less space, thereby facilitating the miniaturization of the electric toothbrush.

[0052] Further, please refer to Figures 2 to 4 The desiccant assembly 120 includes a plurality of adsorbents 121 arranged circumferentially around the charging assembly 140. Specifically, the adsorbents 121 may be zeolites. As will be appreciated, due to the limited space within the bottom cover, arranging the adsorbents 121 circumferentially around the charging assembly 140 allows for full utilization of the available space between the outer periphery of the charging assembly 140 and the surrounding wall 112 for placement of the adsorbents 121. This results in a more compact structure without requiring additional structure or space for the desiccant assembly 120, thereby reducing manufacturing costs.

[0053] In one embodiment, please refer again to Figures 2 to 4The bottom surface of the mounting cavity 113 is provided with a plurality of partitions 114 protruding between the surrounding wall 112 and the charging assembly 140. The plurality of partitions 114 are arranged at intervals around the circumference of the charging assembly 140, and each adsorption member 121 is stopped by the partition 114 in the circumferential direction of the charging assembly 140. Specifically, the partition 114 is provided at the connection between the bottom wall 111 and the inner wall surface of the surrounding wall 112. The plurality of partitions 114 can be evenly distributed around the circumference of the surrounding wall 112, or unevenly distributed. The partition 114 can separate the plurality of adsorption members 121 or the adsorption member 121 from other components to prevent collision and breakage. The adsorption component 121 is circumferentially limited by the partition 114, so that the adsorption component 121 is clamped between two adjacent partitions 114, the surrounding wall 112 and the charging component 140, thereby effectively preventing the adsorption component 121 from shifting laterally within the bottom wall 111, making the fixation of the adsorption component 121 and the bottom shell 110 more stable and reliable.

[0054] Further, if Figures 1 to 4 As shown, the bottom cover assembly 100 of the electric toothbrush also includes at least two magnetic components 150, which extend along the circumference of the charging component 140 and are clamped between the charging component 140 and the surrounding wall 112. Each magnetic component 150 is arranged between two adjacent partitions 114; multiple magnetic components 150 and multiple adsorption components 121 are arranged in sequence in the circumference of the charging component 140.

[0055] In this embodiment, the magnetic member 150 can be made of neodymium iron boron, permanent magnets, etc. The magnetic member 150 can be specifically an arc-shaped magnetic strip. The bottom cover assembly 100 includes at least two magnetic members 150, and multiple magnetic members 150 are arranged circumferentially of the charging assembly 140. In this way, when the electric toothbrush is placed on an external charging stand for charging, the magnetic member 150 can be magnetically positioned with the external charging stand to ensure the charging accuracy of the charging assembly 140. Multiple magnetic members 150 and multiple adsorption members 121 can be arranged in sequence, that is, a magnetic member 150 is provided between two adjacent adsorption members 121, or a adsorption member 121 is provided between two adjacent magnetic members 150. In this way, the layout of the adsorption members 121 and the magnetic members 150 in the entire bottom shell 110 can be made more reasonable, and the gravity balance of the entire bottom cover assembly 100 can be ensured.

[0056] In one embodiment, please refer to Figures 2 to 8 The charging assembly 140 includes a charging coil with a hollowed-out area 141 formed in the middle. This hollowed-out area 141 houses at least one absorbent element 121. By utilizing this hollowed-out area 141 to house the absorbent element 121, the number of absorbent elements 121 that can be installed within the bottom case 110 increases, thereby improving the overall water absorption capacity of the moisture-absorbing assembly 120.

[0057] Further, if Figures 2 to 4 、 Figure 7and Figure 8 As shown, an annular flange 115 protrudes from the center of the bottom wall 111 of the mounting cavity 113. The charging coil is mounted on the outside of the annular flange 115. At least one suction member 121 is located in the center of the annular flange 115. The annular flange 115 provides lateral restraint for the suction member 121, effectively preventing the suction member 121 from shifting laterally in the center of the charging coil and preventing it from contacting the charging coil, thereby improving the reliability of the product.

[0058] The present invention also provides a toothbrush handle 10, please refer to Figures 5 to 8 The toothbrush handle 10 includes a handle housing 200 and a bottom cover assembly 100 of the electric toothbrush. The lower end of the handle housing 200 is provided with an opening 210 communicating with its inner cavity. The bottom shell 110 of the bottom cover assembly 100 of the electric toothbrush is mounted at the opening 210. The specific structure of the bottom cover assembly 100 of the electric toothbrush is similar to the above-mentioned embodiments. Since the toothbrush handle 10 utilizes all the technical solutions of all the above-mentioned embodiments, it at least has all the beneficial effects brought about by the technical solutions of the above-mentioned embodiments, and will not be described in detail here. The handle housing 200 can have a variety of structures and shapes. For example, the handle housing 200 can be a single-layer structure or a double-layer structure with an outer metal layer and an inner plastic layer. The cross-sectional shape of the handle housing 200 can be circular, elliptical, rounded triangle, heart-shaped, etc., and is not specifically limited here. The lower end of the handle housing 200 has an opening 210 for mounting the bottom cover assembly 100. The bottom shell 110 and the handle housing 200 can be fixedly connected by means of a snap-fit ​​or interlocking connection.

[0059] The present invention also provides an electric toothbrush, wherein the toothbrush handle 10 includes a brush head and the toothbrush handle 10 connected to each other. The specific structure of the toothbrush handle 10 is similar to the above-mentioned embodiments. Since the present electric toothbrush adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above-mentioned embodiments, and will not be described in detail here. The specific structure of the brush head and the connection method between the brush head and the toothbrush handle 10 can refer to existing designs and will not be described in detail here.

[0060] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A bottom cover assembly of an electric toothbrush, characterized in that: include: A bottom shell, the bottom shell is used to cover the lower end opening of the brush handle housing, and the bottom shell has an inner mounting surface communicating with the inner cavity of the brush handle housing; as well as The moisture absorption component is installed on the inner installation surface to absorb water vapor in the inner cavity of the brush handle shell.

2. The bottom cover assembly of the electric toothbrush according to claim 1, wherein: The moisture absorption component and the bottom shell are fixedly connected by at least one of bonding, embedding, clamping, welding and injection molding.

3. The bottom cover assembly of the electric toothbrush according to claim 1, wherein: The bottom shell includes a bottom wall and a surrounding wall connected to each other; the bottom wall is used to cover the lower end opening of the brush handle shell; the surrounding wall is used to be embedded in the inner cavity of the brush handle shell; the bottom wall and the surrounding wall together form an installation cavity with an open upper end and connected to the inner cavity of the brush handle shell, and the inner wall surface of the installation cavity forms the inner installation surface.

4. The bottom cover assembly of the electric toothbrush according to claim 3, wherein: The moisture absorption component is arranged on the bottom surface of the installation cavity; the bottom cover component of the electric toothbrush also includes a pressing plate, which is pressed on the top of the moisture absorption component and fixedly connected to the bottom shell.

5. The bottom cover assembly of the electric toothbrush according to claim 4, wherein: The bottom cover assembly of the electric toothbrush further includes a charging coil, which is mounted on the bottom surface of the mounting cavity, and the pressing plate is pressed onto the top of the charging coil.

6. The bottom cover assembly of the electric toothbrush according to any one of claims 3 to 5, characterized in that: The bottom cover assembly of the electric toothbrush also includes a charging assembly, which is installed on the bottom surface of the installation cavity; the moisture absorption assembly is sandwiched between the charging assembly and the surrounding wall.

7. The bottom cover assembly of the electric toothbrush according to claim 6, wherein: The moisture absorption component includes a plurality of adsorbents, and the plurality of adsorbents are arranged along the circumference of the charging component.

8. The bottom cover assembly of the electric toothbrush according to claim 7, wherein: The bottom surface of the installation cavity is provided with a plurality of partitions located between the surrounding wall and the charging component. The plurality of partitions are arranged at intervals around the circumference of the charging component, and each of the adsorption parts is stopped at the partition at the upper limit position around the circumference of the charging component.

9. The bottom cover assembly of the electric toothbrush according to claim 8, wherein: The bottom cover assembly of the electric toothbrush also includes at least two magnetic parts, which extend along the circumference of the charging assembly and are clamped between the charging assembly and the surrounding wall. Each magnetic part is arranged between two adjacent partitions; multiple magnetic parts and multiple adsorption parts are arranged in sequence in the circumference of the charging assembly.

10. The bottom cover assembly of the electric toothbrush according to claim 7, wherein: The charging assembly includes a charging coil, a hollow area is formed in the middle of the charging coil, and at least one adsorption member is provided in the hollow area.

11. The bottom cover assembly of the electric toothbrush according to claim 10, wherein: An annular flange is protruded from the middle of the bottom wall of the installation cavity, the charging coil is sleeved outside the annular flange, and at least one adsorption component is provided in the middle of the annular flange.

12. The bottom cover assembly of the electric toothbrush according to any one of claims 1 to 5, characterized in that: The moisture absorbing component includes a plurality of zeolites.

13. A toothbrush handle, characterized in that: It comprises a handle shell and a bottom cover assembly of an electric toothbrush according to any one of claims 1 to 12; the lower end of the handle shell is provided with an opening connected to its inner cavity, and the bottom shell of the bottom cover assembly of the electric toothbrush is installed at the opening.

14. An electric toothbrush, characterized in that: The invention comprises a brush head and a toothbrush handle as claimed in claim 13 which are connected to each other.

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