Cover plate assembly, micro battery and capsule endoscope

Abstract

The utility model belongs to the technical field of medical instruments and equipment, and discloses a cover plate assembly, a minicell and a capsule endoscope, the cover plate assembly comprises a cover plate, a pole structure and a sealing ring, the cover plate is used for sealing an opening and is in sealing fit with the side wall of the opening, so that sealing is formed between the cover plate and a shell; a sealing ring accommodating groove is formed in the peripheral side wall of the pole structure; the sealing ring is arranged on the peripheral side wall of the pole structure, is accommodated in the sealing ring accommodating groove and is in sealing fit with the sealing ring accommodating groove, so that the sealing performance between the sealing ring and the pole structure is enhanced, the position of the sealing ring relative to the pole structure is fixed, the assembly is convenient, and the service life is prolonged. The outer peripheral side wall of the sealing ring is in sealing fit with the inner peripheral side wall of the cover plate, so that the inner side and the outer side of the sealing ring can form good sealing with the pole structure and the cover plate respectively, liquid leakage is avoided, meanwhile, a traditional glass sealing structure is replaced by the sealing ring, and the machining and precision control difficulty can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of medical equipment, in particular to a cover plate assembly, a micro battery and a capsule endoscope. Background Art

[0002] Compared to traditional endoscopes, capsule endoscopes are painless, non-invasive, and pose no risk of infection or injury. Capsule endoscope batteries typically use manganese dioxide batteries, and the battery cover is typically glass-sealed. This glass-sealed structure typically consists of a base plate, a glass body, and a terminal. The base plate has a mounting hole running through its centerline, and the terminal is sealed to the mounting hole through the glass body. The outer periphery of the base plate is welded to the inner wall of the battery housing to seal the battery.

[0003] However, the processing and precision control of glass-sealed structures are difficult, and leakage is prone to occur due to processing errors. In addition, most poles require the use of slurry drawing or film pressing processes, and the large current pulse performance is poor. Utility Model Content

[0004] The utility model provides a cover plate assembly to solve the problems in the prior art that the glass sealing structure is difficult to control, leakage is likely to occur, and most poles require a slurry drawing or film pressing process, resulting in poor high current pulse performance.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A cover assembly for a microbattery, wherein the microbattery includes a housing, wherein a receiving cavity having an opening is formed inside the housing; the cover assembly includes:

[0007] a cover plate, used to cover the opening and seal with the side wall of the opening;

[0008] A pole structure is provided through the cover plate, and a sealing ring receiving groove is formed on the outer peripheral side wall of the pole structure;

[0009] The sealing ring is arranged on the outer peripheral side wall of the pole structure, and the sealing ring is accommodated in the sealing ring accommodating groove and sealed with the sealing ring accommodating groove; the outer peripheral side wall of the sealing ring is sealed with the inner peripheral side wall of the cover plate.

[0010] As a preferred solution of the cover plate assembly, the longitudinal cross-section of the pole structure is an I-shape, the recess at the outer peripheral side wall of the pole structure forms the sealing ring accommodating groove, and the sealing ring is interference fit in the sealing ring accommodating groove.

[0011] As a preferred solution of the cover plate assembly, the cover plate has a mounting hole running through its center line direction, and the outer peripheral side wall of the sealing ring is formed with a cover plate receiving groove, the sealing ring is accommodated in the mounting hole, and one side wall of the cover plate receiving groove contacts the outer surface of the cover plate, and the other side wall contacts the inner surface of the cover plate.

[0012] As a preferred embodiment of the cover plate assembly, the pole structure includes a first pressure plate, a pole body, and a second pressure plate, wherein the first pressure plate and the second pressure plate are respectively connected to the two ends of the pole body in the axial direction and are spaced apart to form the sealing ring accommodating groove; the sealing ring includes a first side wall, a sealing ring bottom wall, and a second side wall, wherein the first side wall and the second side wall are respectively connected to the two ends of the sealing ring bottom wall in the axial direction and are spaced apart to form the cover plate accommodating groove; the first pressure plate is sealed in cooperation with the first side wall, and the second pressure plate is sealed in cooperation with the second side wall;

[0013] Along the radial direction of the pole structure, the distance between the outer wall of the first side wall and the outer wall of the sealing ring bottom wall is greater than the distance between the outer wall of the first pressure plate and the outer wall of the pole body; and / or,

[0014] Along the radial direction of the pole structure, the distance between the outer wall of the second side wall and the outer wall of the sealing ring bottom wall is greater than the distance between the outer wall of the second pressure plate and the outer wall of the pole body.

[0015] As a preferred solution for the cover plate assembly, the first side wall is located inside the accommodating cavity, and the second side wall is located outside the accommodating cavity. Along the radial direction of the pole structure, the distance between the outer wall of the first side wall and the outer wall of the bottom wall of the sealing ring is greater than the distance between the outer wall of the second side wall and the outer wall of the bottom wall of the sealing ring.

[0016] As a preferred embodiment of the cover plate assembly, the pole structure includes a first pressure plate, a pole body and a second pressure plate. The first pressure plate and the second pressure plate are respectively connected to the two ends of the pole body in the axial direction and are spaced apart to form the sealing ring accommodating groove. The first pressure plate is located in the accommodating cavity, and the second pressure plate is located outside the accommodating cavity. The first pressure plate is integrally formed with the pole body, and the second pressure plate is riveted to the pole body.

[0017] According to another aspect of the present invention, a microbattery is provided, comprising the above-mentioned cover plate assembly, and also comprising a shell and a battery cell structure, wherein the shell has a bottom wall and a shell side wall arranged around the bottom wall, the shell side wall and the bottom wall together form a accommodating cavity with an opening at one end, the diameter of the shell does not exceed 10 mm, the cover plate is used to seal the opening, and the battery cell structure is arranged in the accommodating cavity.

[0018] As a preferred solution for a microbattery, the battery cell structure includes a positive electrode sheet and a negative electrode sheet, the positive electrode sheet is electrically connected to the pole structure, the negative electrode sheet is electrically connected to the outer shell, the positive electrode sheet and the negative electrode sheet are wound around each other to form a core, and the outermost layer is the negative electrode sheet.

[0019] As a preferred solution for the microbattery, the circumference of the outermost layer of the negative electrode sheet is L, and the outermost layer of the negative electrode sheet extends along the circumferential direction after covering the outermost layer of the positive electrode sheet, and the extended length is not less than L / 5.

[0020] According to another aspect of the present invention, a capsule endoscope is provided, comprising the above-mentioned microbattery, an endoscope shell and a working module, wherein the microbattery and the working module are both arranged inside the endoscope shell, and the microbattery is electrically connected to the working module.

[0021] The beneficial effects of the utility model are:

[0022] The utility model provides a cover assembly for a micro battery, which includes a shell, and the interior of the shell forms a accommodating cavity with an opening; the cover assembly includes a cover plate, a pole structure and a sealing ring, the cover plate is used to seal the opening and seal with the side wall of the opening, thereby forming a seal between the cover plate and the shell; a sealing ring accommodating groove is formed on the outer peripheral side wall of the pole structure; the sealing ring is arranged on the outer peripheral side wall of the pole structure, the sealing ring is accommodated in the sealing ring accommodating groove and seals with the sealing ring accommodating groove, thereby enhancing the sealing performance between the sealing ring and the pole structure, and fixing the position of the sealing ring relative to the pole structure for easy assembly, the outer peripheral side wall of the sealing ring seals with the inner peripheral side wall of the cover plate, thereby enabling the inner and outer sides of the sealing ring to form a good seal with the pole structure and the cover plate respectively to avoid liquid leakage, and at the same time, replacing the traditional glass sealing structure with the sealing ring can reduce the difficulty of processing and precision control.

[0023] The present invention provides a microbattery comprising the aforementioned cover plate assembly, a housing, and a cell structure. The housing comprises a bottom wall and sidewalls surrounding the bottom wall. The sidewalls and bottom wall together form a receiving cavity with an opening at one end. The diameter of the housing does not exceed 10 mm, thereby minimizing the size of the microbattery. The cover plate is used to seal the opening, and the cell structure is disposed within the receiving cavity. In the aforementioned cover plate assembly, the cover plate and the housing are hermetically sealed, and the inner and outer sides of the sealing ring can respectively form a good seal with the terminal structure and the cover plate to prevent leakage. Furthermore, the sealing ring replaces the traditional glass seal structure, which can reduce the difficulty of processing and precision control.

[0024] The present invention also provides a capsule endoscope, including the above-mentioned microbattery, an endoscope shell and a working module. The microbattery and the working module are both arranged inside the endoscope shell, and the microbattery is electrically connected to the working module. The microbattery is relatively small in size, and the sealing performance of the cover assembly and the outer shell is good, which can avoid leakage. At the same time, the traditional glass sealing structure is replaced by a sealing ring, which can reduce the difficulty of processing and precision control. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic structural diagram of a micro battery in an embodiment of the present utility model;

[0026] Figure 2 It is an exploded view of the cover assembly in the embodiment of the present utility model.

[0027] In the picture:

[0028] 100, housing; 101, bottom wall; 102, housing side wall; 103, opening; 104, accommodating cavity;

[0029] 200, cover plate; 201, mounting hole;

[0030] 300, pole assembly; 301, sealing ring receiving groove; 310, first pressing plate; 320, pole body; 330, second pressing plate;

[0031] 400, sealing ring; 401, cover plate receiving groove;

[0032] 500, positive electrode sheet; 510, positive electrode tab;

[0033] 600, negative electrode sheet; 610, negative electrode tab;

[0034] 700, insulation layer;

[0035] 800. Insulating gasket. DETAILED DESCRIPTION

[0036] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of its components.

[0037] In the description of this utility model, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0038] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0039] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are used to refer to positions or locations based on the positions or locations shown in the accompanying drawings. These terms are intended solely to facilitate description and simplify operation, and are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0040] Capsule endoscope batteries typically use manganese dioxide batteries, and the battery cover generally adopts a glass-sealed structure. The glass-sealed structure usually includes a base plate, a glass body, and a pole. The base plate has a mounting hole running through its centerline, and the pole is sealed with the mounting hole through the glass body. The outer periphery of the base plate is welded and sealed to the inner wall of the battery housing, thereby achieving battery packaging. However, the processing and precision control of the glass-sealed structure are relatively difficult, and leakage is prone to occur due to processing errors. In addition, most poles require a slurry drawing or film pressing process, resulting in poor high-current pulse performance.

[0041] In response to the above problems, this embodiment provides a micro battery to solve the problems in the existing technology that the glass sealing structure is difficult to control, leakage is prone to occur, and most of the poles require the use of slurry drawing or film pressing processes, resulting in poor high current pulse performance. It can be used in the field of medical equipment technology.

[0042] Reference Figure 1-Figure 2The cover plate assembly is used for a micro battery, which includes a shell 100. The interior of the shell 100 forms a accommodating cavity 104 with an opening 103; the cover plate assembly includes a cover plate 200, a pole structure 300 and a sealing ring 400. The cover plate 200 is used to seal the opening 103 and seal with the side wall of the opening 103, so that a seal is formed between the cover plate 200 and the shell 100. Specifically, the cover plate 200 and the side wall of the opening 103 are sealed by welding. The pole structure 300 is passed through the cover plate 200, and a sealing ring accommodating groove 301 is formed on the outer peripheral side wall of the pole structure 300; the sealing ring 400 is arranged on the outer peripheral side wall of the pole structure 300, and the sealing ring 400 is accommodated in the sealing ring accommodating groove 301 and seals with the sealing ring accommodating groove 301, thereby enhancing the sealing performance between the sealing ring 400 and the pole structure 300, and fixing the position of the sealing ring 400 relative to the pole structure 300, which is convenient for assembly. The outer peripheral side wall of the sealing ring 400 is sealed with the inner peripheral side wall of the cover plate 200, so that the inner and outer sides of the sealing ring 400 can form a good seal with the pole structure 300 and the cover plate 200 respectively to avoid leakage. At the same time, replacing the traditional glass sealing structure with the sealing ring 400 can reduce the difficulty of processing and precision control.

[0043] In this embodiment, the sealing ring 400 is made of a plastic material to enable elastic deformation and provide a good sealing effect. Specifically, the sealing ring 400 is made of PP, PPS, GPPS, PFA, HDPE, or PC to enhance the sealing effect of the sealing ring 400. Tests have shown that using sealing rings 400 made of these materials can increase the battery life and reduce the self-discharge rate. Furthermore, using these materials can provide the sealing ring 400 with certain insulation properties.

[0044] Continue to refer to Figure 1-Figure 2 Specifically, the longitudinal cross-section of the pole structure 300 is an I-shape, and the recessed portion at the outer peripheral side wall of the pole structure 300 forms a sealing ring receiving groove 301, so that the overall structure of the pole structure 300 is relatively simple. The sealing ring 400 is interference fit with the sealing ring receiving groove 301. Therefore, along the centerline direction of the pole structure 300, the length of the sealing ring 400 should be slightly larger than the distance between the two side walls of the sealing ring receiving groove 301. Since the sealing ring 400 is made of plastic material, it has a certain degree of elasticity and can be assembled with the side wall of the sealing ring receiving groove 301 to form an interference fit, thereby enhancing the sealing performance between the sealing ring 400 and the side wall of the sealing ring receiving groove 301.

[0045] Continue to refer to Figure 1-Figure 2The cover plate 200 has a mounting hole 201 running through its center line direction, and a cover plate receiving groove 401 is formed on the outer peripheral side wall of the sealing ring 400. The sealing ring 400 is accommodated in the mounting hole 201, and one side wall of the cover plate receiving groove 401 contacts the outer surface of the cover plate 200, and the other side wall contacts the inner surface of the cover plate 200, thereby enhancing the sealing performance between the sealing ring and the cover plate, and can further prevent liquid leakage.

[0046] Continue to refer to Figure 1-Figure 2 The pole structure 300 includes a first pressure plate 310, a pole body 320 and a second pressure plate 330. The first pressure plate 310 and the second pressure plate 330 are respectively connected to the two ends of the pole body 320 in the axial direction and are spaced apart to form a sealing ring accommodating groove 301; the sealing ring 400 includes a first side wall 410, a sealing ring bottom wall 420 and a second side wall 430. The first side wall 410 and the second side wall 430 are respectively connected to the two ends of the sealing ring bottom wall 420 in the axial direction and are spaced apart to form a cover plate accommodating groove 401, wherein the first pressure plate 310 is sealed with the first side wall 410, and the second pressure plate 330 is sealed with the second side wall 430. Along the radial direction of the pole structure 300, the distance between the outer wall of the first side wall 410 and the outer wall of the sealing ring bottom wall 420 is greater than the distance between the outer wall of the first pressure plate 310 and the outer wall of the pole body 320, so that the entire surface of the first pressure plate 310 near the first side wall 410 can be in contact with the first side wall 410, thereby improving sealing performance. And / or, along the radial direction of the pole structure 300, the distance between the outer wall of the second side wall 430 and the outer wall of the sealing ring bottom wall 420 is greater than the distance between the outer wall of the second pressure plate 330 and the outer wall of the pole body 320, so that the entire surface of the second pressure plate 330 near the second side wall 430 can be in contact with the second side wall 430, thereby improving sealing performance. This embodiment exemplifies a solution in which the distance between the outer wall of the first side wall 410 and the outer wall of the sealing ring bottom wall 420 is greater than the distance between the outer wall of the first pressure plate 310 and the outer wall of the pole body 320, and the distance between the outer wall of the second side wall 430 and the outer wall of the sealing ring bottom wall 420 is greater than the distance between the outer wall of the second pressure plate 330 and the outer wall of the pole body 320.

[0047] Continue to refer to Figure 1-Figure 2 The first sidewall 410 is located within the accommodating cavity 104, while the second sidewall 430 is located outside the accommodating cavity 104. Since the second sidewall 430 is located on one side of the outer surface of the cover plate 200 and is in direct contact with the outside, a high level of sealing performance is required between the second sidewall 430 and the second pressure plate 330. To meet this requirement, in this embodiment, along the radial direction of the pole structure 300, the distance between the outer wall of the first sidewall 410 and the outer wall of the sealing ring bottom wall 420 is greater than the distance between the outer wall of the second sidewall 430 and the outer wall of the sealing ring bottom wall 420.

[0048] Continue to refer to Figure 1-Figure 2 The first pressing plate 310 is located within the accommodating cavity 104, and the second pressing plate 330 is located outside the accommodating cavity 104. The first pressing plate 310 is integrally formed with the pole body 320, and the second pressing plate 330 is riveted to the pole body 320. The sealing ring 400 can be first placed on the pole body 320 and pushed to abut against the first pressing plate 310. The second pressing plate 330 is then installed on the pole body 320 by riveting to complete the assembly.

[0049] This embodiment also provides a microbattery, comprising the above-mentioned cover plate assembly, a housing 100, and a cell structure. The housing 100 has a bottom wall 101 and a housing side wall 102 surrounding the bottom wall 101. The housing side wall 102 and the bottom wall 101 together form a receiving cavity 104 having an opening 103 at one end. The diameter of the housing 100 does not exceed 10 mm, thereby minimizing the size of the microbattery. The cover plate 200 is used to seal the opening 103, and the cell structure is disposed within the receiving cavity 104. In the above-mentioned cover plate assembly, the cover plate 200 and the housing 100 are sealed together, and the inner and outer sides of the sealing ring 400 can respectively form a good seal with the pole structure 300 and the cover plate 200 to prevent leakage. At the same time, replacing the traditional glass sealing structure with the sealing ring can reduce the difficulty of processing and precision control.

[0050] Continue to refer to Figure 1-Figure 2 The battery cell structure includes a positive electrode sheet 500 and a negative electrode sheet 600. The positive electrode sheet 500 is electrically connected to the pole structure 300, and the negative electrode sheet 600 is electrically connected to the outer shell 100. The positive terminal of the external structure can be connected to the pole assembly 300, and the negative terminal can be directly connected to the outer shell 100, so that the battery can power the external structure. In this embodiment, the external structure is a working module of a capsule endoscope. The positive electrode sheet 500 and the negative electrode sheet 600 are wound around each other to form a winding core, and the outermost layer is the negative electrode sheet 600. That is, the battery is a wound battery, and the outermost layer is the negative electrode sheet 600. Since the negative electrode sheet 600 is electrically connected to the outer shell 100, the outermost layer is the negative electrode sheet 600, which can facilitate the connection between the negative electrode sheet 600 and the outer shell 100, and at the same time can prevent the positive electrode sheet 500 from contacting the outer shell 100, thus avoiding short circuits and ensuring safety. In addition, since the charge of the microbattery depends on the size of the positive electrode sheet 500, placing the negative electrode sheet 600 in the outermost layer to wrap the positive electrode sheet 500 can ensure that the performance of the entire positive electrode sheet 500 can be released. Compared with the solution where the positive electrode sheet 500 is placed in the outermost layer, the energy density of the microbattery can be improved.

[0051] Continue to refer to Figure 1-Figure 2The circumference of the outermost layer of the negative electrode sheet 600 is L. After the outermost layer of the negative electrode sheet 600 covers the outermost layer of the positive electrode sheet 500, it extends in the circumferential direction, and the extension length is not less than L / 5 to ensure that the outermost layer of the negative electrode sheet 600 can cover the outermost layer of the positive electrode sheet 500.

[0052] Continue to refer to Figure 1-Figure 2 The height of the housing 100 does not exceed 10 mm, and the diameter of the housing 100 also does not exceed 10 mm. This reduces the size of the housing 100 and allows it to fit into the narrow space of a capsule endoscope. Optionally, the diameter of the housing 100 ranges from 6 mm to 10 mm, specifically 6 mm, 6.5 mm, 7 mm, 7.5 mm, 8 mm, 8.5 mm, 9 mm, 9.5 mm, or 10 mm; the height of the housing 100 ranges from 5 mm to 10 mm, specifically 5 mm, 5.5 mm, 6 mm, 6.5 mm, 7 mm, 7.5 mm, 8 mm, 8.5 mm, 9 mm, 9.5 mm, or 10 mm.

[0053] Continue to refer to Figure 1-Figure 2 The surface of the positive electrode sheet 500 is coated with an electrode active material. This is done to improve battery performance, control electrode thickness, ensure battery safety, and optimize the battery manufacturing process. In this embodiment, the thickness of the positive electrode sheet 500 after coating with the electrode active material is 0.2 mm to 0.5 mm, and the length is 50 mm to 300 mm. Tests have shown that using thick electrodes can increase the battery's 2C continuous discharge capacity by more than 80%.

[0054] Continue to refer to Figure 1-Figure 2 An insulating layer 700 is provided between the positive electrode sheet 500 and the negative electrode sheet 600 to prevent contact between the positive electrode sheet 500 and the negative electrode sheet 600. To ensure insulation, along the centerline of the winding core (i.e., the centerline direction of the positive electrode sheet 500 and the negative electrode sheet 600 wound around each other), the positive electrode sheet 500 and the negative electrode sheet 600 are the same length, while the insulating layer 700 is longer than the positive electrode sheet 500 and the negative electrode sheet 600, and both ends of the insulating layer 700 extend relative to the positive electrode sheet 500 or the negative electrode sheet 600.

[0055] Continue to refer to Figure 1-Figure 2 Along the center line direction of the core, an insulating gasket 800 is provided at at least one end of the core. In this embodiment, along the center line direction of the core, insulating gaskets 800 are provided at both ends of the core. The insulating gasket 800 can prevent the core from directly contacting other structures along its center line direction.

[0056] This embodiment also provides a capsule endoscope, including the above-mentioned microbattery, an endoscope shell and a working module. The microbattery and the working module are both arranged inside the endoscope shell, and the microbattery is electrically connected to the working module. The microbattery is relatively small in size, and the sealing performance of the cover assembly and the outer shell 100 is good, which can avoid leakage. At the same time, the traditional glass sealing structure is replaced by a sealing ring, which can reduce the difficulty of processing and precision control.

[0057] Obviously, the above-described embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the manner in which the present invention is to be implemented. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. Cover plate assembly, characterized in that, For a micro battery, the micro battery comprises a housing (100), wherein a receiving cavity (104) having an opening (103) is formed inside the housing (100); the cover assembly comprises: A cover plate (200) for covering the opening (103) and sealingly cooperating with a side wall of the opening (103); A pole structure (300) is provided through the cover plate (200), and a sealing ring receiving groove (301) is formed on the outer peripheral side wall of the pole structure (300); A sealing ring (400) is provided on the outer peripheral side wall of the pole structure (300); the sealing ring (400) is accommodated in the sealing ring receiving groove (301) and is sealed with the sealing ring receiving groove (301); the outer peripheral side wall of the sealing ring (400) is sealed with the inner peripheral side wall of the cover plate (200).

2. The cover plate assembly according to claim 1, wherein: The longitudinal cross-section of the pole structure (300) is in an I-shape, the recessed portion at the outer peripheral side wall of the pole structure (300) forms the sealing ring accommodating groove (301), and the sealing ring (400) is interference-fitted with the sealing ring accommodating groove (301).

3. The cover plate assembly according to claim 1, wherein: The cover plate (200) has a mounting hole (201) running through the center line thereof, and a cover plate receiving groove (401) is formed on the outer peripheral side wall of the sealing ring (400). The sealing ring (400) is received in the mounting hole (201), and one side wall of the cover plate receiving groove (401) contacts the outer surface of the cover plate (200), and the other side wall contacts the inner surface of the cover plate (200).

4. The cover plate assembly according to claim 3, wherein: The pole structure (300) includes a first pressure plate (310), a pole body (320) and a second pressure plate (330), wherein the first pressure plate (310) and the second pressure plate (330) are respectively connected to the two ends of the pole body (320) in the axial direction and are spaced apart to form the sealing ring accommodating groove (301); the sealing ring (400) includes a first side wall (410), a sealing ring bottom wall (420) and a second side wall (430), wherein the first side wall (410) and the second side wall (430) are respectively connected to the two ends of the sealing ring bottom wall (420) in the axial direction and are spaced apart to form the cover plate accommodating groove (401); the first pressure plate (310) is sealed in cooperation with the first side wall (410), and the second pressure plate (330) is sealed in cooperation with the second side wall (430); Along the radial direction of the pole structure (300), the distance between the outer wall of the first side wall (410) and the outer wall of the sealing ring bottom wall (420) is greater than the distance between the outer wall of the first pressure plate (310) and the outer wall of the pole body (320); and / or, Along the radial direction of the pole structure (300), the distance between the outer wall of the second side wall (430) and the outer wall of the sealing ring bottom wall (420) is greater than the distance between the outer wall of the second pressure plate (330) and the outer wall of the pole body (320).

5. The cover plate assembly according to claim 4, wherein: The first side wall (410) is located inside the accommodating cavity (104), and the second side wall (430) is located outside the accommodating cavity (104). Along the radial direction of the pole structure (300), the distance between the outer wall of the second side wall (430) and the outer wall of the sealing ring bottom wall (420) is greater than the distance between the outer wall of the first side wall (410) and the outer wall of the sealing ring bottom wall (420).

6. The cover plate assembly according to any one of claims 2 to 5, characterized in that: The pole structure (300) comprises a first pressing plate (310), a pole body (320) and a second pressing plate (330), wherein the first pressing plate (310) and the second pressing plate (330) are respectively connected to the two ends of the pole body (320) in the axial direction and are spaced apart to form the sealing ring receiving groove (301), the first pressing plate (310) is located in the receiving cavity (104), and the second pressing plate (330) is located outside the receiving cavity (104), the first pressing plate (310) and the pole body (320) are integrally formed, and the second pressing plate (330) and the pole body (320) are riveted together.

7. A miniature battery, characterized in that The invention comprises a cover plate assembly according to any one of claims 1 to 6, and further comprises a shell (100) and a battery cell structure, wherein the shell (100) has a bottom wall (101) and a shell side wall (102) arranged around the bottom wall (101), the shell side wall (102) and the bottom wall (101) together form a receiving cavity (104) having an opening (103) at one end, the diameter of the shell (100) does not exceed 10 mm, the cover plate (200) is used to seal the opening (103), and the battery cell structure is arranged in the receiving cavity (104).

8. The microbattery according to claim 7, characterized in that The battery core structure comprises a positive electrode sheet (500) and a negative electrode sheet (600), wherein the positive electrode sheet (500) is electrically connected to the pole structure (300), and the negative electrode sheet (600) is electrically connected to the shell (100), and the positive electrode sheet (500) and the negative electrode sheet (600) are wound around each other to form a winding core, and the outermost layer is the negative electrode sheet (600).

9. The microbattery according to claim 8, characterized in that The circumference of the outermost layer of the negative electrode sheet (600) is L, and the outermost layer of the negative electrode sheet (600) covers the outermost layer of the positive electrode sheet (500) and extends in the circumferential direction, and the extension length is not less than L / 5.

10. A capsule endoscope, characterized in that It includes a microbattery as described in any one of claims 7 to 9, and also includes an endoscope shell and a working module, the microbattery and the working module are both arranged inside the endoscope shell, and the microbattery is electrically connected to the working module.

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