Cap assembly, button cell, and electronic device

Abstract

The utility model relates to a kind of cap assembly, buckle battery and electronic equipment.Cap assembly includes: cover, the cover, is provided with first through-hole, the cover has first surface;Cap body, the cap body has with the second surface of first surface opposite arrangement;Insulating rubber ring, the insulating rubber ring has with the second through-hole of first through-hole opposite, the cap body, the insulating rubber ring, the cover are sequentially stacked and arranged, the cap body and the cover are bonded together by the insulating rubber ring, the first surface and the second surface respectively with the two surfaces of insulating rubber ring opposite contact, at least one of the first surface and the second surface has uneven rough structure.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and more specifically, to a cap assembly, a button battery, and an electronic device. Background Technology

[0002] A cap assembly typically consists of a cap body and a cover plate. The cap body and cover plate are bonded together with insulating adhesive. However, both the cap body and cover plate are usually made of metal. The smooth surface of metal results in poor adhesion of the insulating adhesive, making it easy for the cap body and cover plate to separate.

[0003] Therefore, a new technical solution is needed to solve the above-mentioned technical problems. Utility Model Content

[0004] One objective of this invention is to provide a new technical solution for a cap assembly.

[0005] According to one aspect of the present invention, a cap assembly is provided. The assembly includes:

[0006] A cover plate, wherein the cover plate is provided with a first through hole and the cover plate has a first surface;

[0007] A cap body having a second surface disposed opposite to the first surface;

[0008] An insulating rubber ring has a second through hole opposite to the first through hole. The cap body, the insulating rubber ring, and the cover plate are stacked in sequence. The cap body, the cover plate, and the insulating rubber ring are bonded together. The first surface and the second surface are in contact with two opposite surfaces of the insulating rubber ring. At least one of the first surface and the second surface has an uneven, rough structure.

[0009] Optionally, the rough structure is a series of parallel dotted lines.

[0010] Optionally, the rough structure includes multiple pits.

[0011] Optionally, the plurality of said pits are arranged in an array; or

[0012] Multiple pits are arranged radially outward from the center of the cover plate or the cap body.

[0013] Alternatively, the pits can be formed by laser etching.

[0014] Optionally, the cover plate and the cap body are circular, the diameter of the cover plate is larger than the diameter of the cap body, the first surface has the rough structure in the area directly opposite the second surface, and the first surface also has a planar area surrounding the rough structure.

[0015] Optionally, it also includes a sealant that fills the gap between the cap body and the cover plate.

[0016] Optionally, the outer edge of the insulating rubber ring protrudes beyond the outer edge of the cap body, the outer edge of the cover plate protrudes beyond the outer edge of the insulating rubber ring, and the sealant covers the outer edge of the insulating rubber ring and the outer edge of the cap body.

[0017] Optionally, a boss is formed in the middle of the cap body, the insulating rubber ring is sleeved on the boss, and the boss is inserted into the first through hole.

[0018] Optionally, an annular protrusion is formed in the middle of the insulating rubber ring, the annular protrusion is arranged around the second through hole, the boss is located in the second through hole and abuts against the inner wall of the annular protrusion, and the annular protrusion is located in the first through hole and abuts against the inner wall of the first through hole.

[0019] Optionally, the thickness of the rough structure is within 50% of the thickness of the cover plate body.

[0020] According to a second aspect of the present invention, a button battery is provided. The battery includes the cap assembly described in this application.

[0021] Optionally, the system also includes a housing, the housing having a sidewall with an opening at one end, and a cover sealingly disposed at the opening.

[0022] Optionally, the cap body is located inside or outside the housing.

[0023] According to a third aspect of this invention, an electronic device is provided. This electronic device includes the button battery described in this application.

[0024] One technical advantage of this invention is that at least one of the first and second surfaces has an uneven, rough structure, which significantly increases the specific surface area for bonding with the insulating rubber ring, thereby improving the adhesion between the cover plate, the cap body, and the insulating rubber ring. This significantly improves the structural strength and durability of the cap assembly.

[0025] Other features and advantages of the present invention will become clear from the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings. Attached Figure Description

[0026] The accompanying drawings, which form part of this specification, illustrate embodiments of the present invention and, together with the specification, serve to explain the principles of the present invention.

[0027] Figure 1 This is a cross-sectional view of the cap assembly according to an embodiment of this application.

[0028] Figure 2 This is an exploded view of a cap assembly without sealant according to an embodiment of this application.

[0029] Figure 3 This is a schematic diagram of the structure of the cap body according to an embodiment of this application.

[0030] Figure 4 This is a bottom view of the cap assembly according to an embodiment of this application.

[0031] Figure 5 This is a cross-sectional view of a button battery according to an embodiment of this application.

[0032] Figure 6 This is a cross-sectional view of another button battery according to an embodiment of this application.

[0033] Figure 7 This is a schematic diagram of the cap body according to an embodiment of this application.

[0034] Figure 8 This is a schematic diagram of a cover plate according to an embodiment of this application.

[0035] Figure 9 This is a cross-sectional view of a third type of button battery according to an embodiment of this application.

[0036] Figure 10 This is a cross-sectional view of a fourth type of button battery according to an embodiment of this application.

[0037] Explanation of reference numerals in the attached figures:

[0038] 100. Cover plate; 101. First through hole; 102. Flat area; 103. Recess;

[0039] 200. Insulating rubber ring; 201. Annular protrusion; 202. Second through hole;

[0040] 300. Cap body; 301. Boss; 301a. Weld point; 302. First gap; 303. Second gap; 304. Dotted line structure;

[0041] 400. Sealant;

[0042] 500, Shell; 501, Side wall; 502, Bottom wall;

[0043] 600. Battery core; 601. Positive tab; 602. Negative tab; 603. Cavity; 604. Top surface. Detailed Implementation

[0044] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the present invention.

[0045] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the invention or its application or use.

[0046] Technologies and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such technologies and equipment should be considered part of the specification.

[0047] In all the examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0048] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0049] According to one embodiment of this application, a cap assembly is provided. The cap assembly includes:

[0050] A cover plate 100, wherein the cover plate 100 is provided with a first through hole 101, and the cover plate 100 has a first surface;

[0051] Cap body 300, the cap body 300 having a second surface disposed opposite to the first surface;

[0052] An insulating rubber ring 200 has a second through hole 202 opposite to the first through hole 101. The cap body 300, the insulating rubber ring 200, and the cover plate 100 are stacked in sequence and sealed together. The cap body 300, the cover plate 100, and the insulating rubber ring 200 are sealed together. The first surface and the second surface are in contact with two opposite surfaces of the insulating rubber ring 200, and at least one of the first surface and the second surface has an uneven and rough structure.

[0053] Specifically, such as Figures 1-8As shown, the cover plate 100 and the cap body 300 are made of metal, such as stainless steel, nickel alloy, copper alloy, etc. Stainless steel, in particular, has high structural strength and corrosion resistance. The cover plate 100 and the cap body 300 are sheet-like structures. The shapes of the cover plate 100 and the cap body 300 can be, but are not limited to, circular, rectangular, elliptical, etc. For example, the cover plate 100, the cap body 300, and the first through hole 101 can be prepared by stamping, laser cutting, etc. The first through hole 101 is located in the middle of the cover plate 100. The cover plate 100 is typically located at one end of the housing 500, and together with the bottom wall 502 of the housing 500, it seals the housing 500. The insulating rubber ring 200 is made of plastic, thermoplastic elastomer, silicone, rubber, etc.

[0054] The substrate of the insulating rubber ring 200 is coated onto the cover plate 100 and / or the cap body 300, and cured by UV light, heat, or other methods to bond the cover plate 100 and the cap body 300 together; alternatively, the insulating rubber ring 200 is injection molded and bonded to the cover plate 100 and the cap body 300 using an adhesive. A second through hole 202 is provided in the center of the insulating rubber ring 200. The second through hole is positioned opposite to the first through hole 101 to expose the center of the cap body 300. The center of the cap body 300 is used for connection to the electrode tab of the battery cell or an external circuit. After assembly, a gap will be formed between the edge of the cap body 300 and the cover plate 100.

[0055] The first and second surfaces are the surfaces of the cover plate 100 and the cap body 300, respectively, used for bonding with the insulating ring 200. For example, the roughened structure includes pits and / or protrusions. The first and second surfaces may have a partially roughened structure or a completely roughened structure. At least one of the first and second surfaces has an uneven roughened structure, which can significantly increase the specific surface area for bonding the cover plate 100 or cap body 300 with the insulating ring 200, and improve the bonding force between the cover plate 100, cap body 300, and insulating ring 200. This significantly improves the structural strength and durability of the cap assembly.

[0056] In one example, the thickness of the rough structure is within 50% of the thickness of the cover plate body 300.

[0057] The greater the thickness of the rough structure, the lower the structural strength of the cover plate body 300; the smaller the thickness of the rough structure, the smaller the specific surface area of ​​the cover plate body 300. Within this range, the cover plate body 300 has a large specific surface area and high structural strength.

[0058] In one example, the coefficient of friction for the rough structure is between 0.1u and 0.8u. Within this range, the cover body 300 has a large specific surface area. The cap assembly has high structural strength.

[0059] In one example, a boss 301 is formed in the middle of the cap body 300, the insulating rubber ring 200 is sleeved on the boss 301, and the boss 301 is inserted into the first through hole 101.

[0060] like Figure 1 As shown, a boss 301 is formed in the middle of the cap body 300 by stamping. An insulating rubber ring 200 is fitted over the boss 301. The boss 301 is embedded in the first through hole 101 to fix the cover plate 100 and the cap body 300 in a radial position. The boss 301 is used to connect with the tabs of the battery core 600 or to connect electrically with an external circuit.

[0061] Of course, the cap body 300 may also be without the protrusion 301. In this case, the cap body 300 is entirely flat. In one example, the rough structure is a plurality of parallel dotted line structures 304.

[0062] like Figure 7 As shown, the area outside the boss 301 of the cap body 300 is provided with dotted linear structures 304. The dotted linear structures 304 are either recesses 103 or protrusions. The recesses 103 or protrusions are intermittently dotted or linear in shape. The dotted linear structures 304 can effectively increase the specific surface area of ​​the surface on which they are located.

[0063] In one example, the rough structure includes multiple pits 103.

[0064] like Figure 8 As shown, the cover plate 100 has recesses 103 in certain areas. Multiple recesses 103 are arranged around the first through hole 101. The recesses 103 are easier to manufacture than protrusions. For example, different recesses 103 may have the same or different dimensions. The recesses 103 can significantly increase the specific surface area of ​​the surface they occupy.

[0065] Of course, the rough structure is not limited to the above embodiments, and those skilled in the art can make settings according to actual needs.

[0066] In one example, the plurality of said pits 103 are arranged in an array; or

[0067] Multiple pits are arranged radially outward from the center of the cover plate 100 or the cap body 300.

[0068] In this example, the array of recesses 103 ensures that different parts of the surface have the same bonding force with the insulating rubber ring 200.

[0069] like Figure 8As shown, a plurality of recesses 103 on the cover plate 100 are arranged radially outward from the first through hole 101. The density of recesses 103 near the first through hole 101 is greater than the density of recesses 103 near the outer edge of the cover plate 100. This results in a greater bonding force between the cover plate 100 near the first through hole 101 and the insulating rubber ring 200 than the bonding force between the cover plate 100 near the outer edge and the insulating rubber ring 200.

[0070] In one example, the pit is formed using laser etching.

[0071] In this example, laser etching has the advantages of fast processing speed and high efficiency.

[0072] In one example, the sealant 400 fills the gap between the cover plate 100 and the cap body 300.

[0073] For example, sealant 400 is a curing adhesive, meaning that sealant 400 is initially liquid to facilitate application into the aforementioned gaps. After curing, sealant 400 becomes solid. The cured sealant 400 can fill the gaps. For example, the sealant 400 includes at least one of silicone sealant, polyurethane sealant, polysulfide sealant, acrylic sealant, anaerobic sealant, epoxy sealant, butyl sealant, neoprene sealant, siloxane sealant, PVC sealant, and asphalt sealant. All of the above materials can form good sealing and bonding effects.

[0074] The edge of the insulating rubber ring 200 is prone to detaching from the cover plate 100 and the cap body 300. The edge of the insulating rubber ring 200 is typically located at the aforementioned gap. In this example, the sealant 400 effectively fills the gap between the cover plate 100 and the cap body 300. The sealant 400 strengthens the connection between the insulating rubber ring 200 and the cover plate 100 and the cap assembly, preventing the insulating rubber ring 200 from detaching. The sealant 400 significantly improves the integrity and durability of the cap assembly.

[0075] In one example, the cover plate 100 and the cap body 300 are circular, the diameter of the cover plate 100 is larger than the diameter of the cap body 300, the first surface has the rough structure in the area opposite to the second surface, and the first surface also has a planar area 102 surrounding the rough structure.

[0076] like Figure 7 , Figure 8As shown, both the cover plate 100 and the cap body 300 are circular. The cover plate 100 has a larger diameter. A rough structure is formed on the region of the first surface near the first through-hole 101, and this region matches the shape and size of the second surface. A planar region 102 is formed at the outer edge of the first surface. The exposed rough structure easily accumulates contaminants. The planar region 102 effectively reduces contaminant adhesion to the cover plate, thereby preventing corrosion of the cover plate.

[0077] In one example, the gap is formed between the outer edge of the cap body 300 and the cover plate 100, and the sealant 400 fills the gap.

[0078] like Figure 1 , Figure 4 As shown, an annular stepped structure is formed on the outer edge of the cap body 300. This stepped structure forms an annular gap. Sealant 400 fills this gap. The sealant 400 has an annular structure. This annular gap is relatively long. The sealant 400 effectively prevents liquids and gases from leaking out of this gap.

[0079] In addition, the sealant 400 covering the stepped structure prevents the edges of the insulating ring 200 and the cap body 300 from being exposed, reduces the surface tension at that location, and reduces the strain generated on the insulating ring 200 and the cap body 300 at that location.

[0080] In addition, sealant 400 can effectively prevent the accumulation of contaminants, especially salt, at the step structure, which can cause dirt and corrosion to the cap assembly.

[0081] In one example, the outer edge of the insulating rubber ring 200 protrudes beyond the outer edge of the cap body 300, the outer edge of the cover plate 100 protrudes beyond the outer edge of the insulating rubber ring 200, and the sealant 400 covers the outer edge of the insulating rubber ring 200 and the outer edge of the cap body 300.

[0082] like Figure 1 , Figure 4As shown, the cover plate 100 and the cap body 300 are typically connected to different electrodes of the battery cell. The diameter of the insulating ring 200 is larger than the diameter of the cap body 300, so that the outer edge of the insulating ring 200 protrudes beyond the outer edge of the cap body 300. The diameter of the cover plate 100 is larger than the diameter of the insulating ring 200, so that the outer edge of the cover plate 100 protrudes beyond the outer edge of the insulating ring 200. This arrangement effectively isolates the cover plate 100 and the cap body 300, thereby effectively preventing electrical connections between the cover plate 100 and the cap. The cap body 300, the insulating ring 200, and the cover plate 100 form a multi-step structure at their edges. Covering the multi-step structure with sealant 400 effectively prevents the multi-step structure from being exposed, thus reducing the accumulation of contaminants on the multi-step structure.

[0083] In addition, the softer insulating ring 200 is sandwiched between the harder cover plate 100 and the cap body 300. At the outer edge, the insulating ring 200 is prone to wrinkling and falling off. The sealant 400 can effectively fix the insulating ring 200 and improve the structural stability of the insulating ring 200.

[0084] Of course, the cover plate 100, the insulating rubber ring 200 and the cap body 300 are not limited to circles, but can also be rectangular, elliptical or other shapes. Those skilled in the art can make the settings according to actual needs.

[0085] In one example, an annular protrusion 201 is formed in the middle of the insulating rubber ring 200, and a second through hole 202 is formed inside the annular protrusion 201. The boss 301 is located inside the second through hole 202 and abuts against the inner wall of the second through hole 202. The annular protrusion 201 is located inside the first through hole 101 and abuts against the inner wall of the first through hole 101.

[0086] like Figure 1 As shown, an annular protrusion 201 is formed in the center of the insulating ring 200. The annular protrusion 201 is embedded in the first through hole 101. For example, the insulating ring 200 is integrally formed by injection molding. The insulating ring 200 is bonded to the cover plate 100 and the cap assembly with an adhesive. The annular protrusion 201 is arranged around the second through hole 202. The insulating ring 200 can isolate the cover plate 100 and the cap assembly to avoid electrical connection between them. The annular protrusion 201 increases the connection area between the insulating ring 200 and the cover plate 100 and the cap body 300, thereby improving the structural strength of the cap assembly.

[0087] Of course, the shape of the insulating rubber ring 200 is not limited to the above embodiments, and those skilled in the art can set it according to actual needs.

[0088] In one example, a gap is formed between the insulating rubber ring 200 and the cap body 300, and the sealant 400 fills the gap; and / or

[0089] A gap is formed between the insulating rubber ring 200 and the cover plate 100, and the sealant 400 fills the gap.

[0090] like Figure 1 As shown, a first gap 302 is formed between the insulating rubber ring 200 and the cap body 300. A second gap 303 is formed between the insulating rubber ring 200 and the cover plate 100. The outer edge of the insulating rubber ring 200 is typically thinner. Both the first gap 302 and the second gap 303 are located at the outer edge of the insulating rubber ring 200, and are located on opposite sides of the insulating rubber ring 200. Sealant 400 fills the first gap 302 and the second gap 303. For example, the height of the first gap 302 and the second gap 303 is typically small, and during filling, the liquid sealant 400 is filled into the first gap 302 and the second gap 303 using a siphon effect.

[0091] The sealant 400 in the first gap 302 and the second gap 303 can further enhance the bonding force between the insulating rubber ring 200 and the cover plate 100 and the cap body 300, and prevent contaminants from accumulating in the first gap 302 and the second gap 303.

[0092] According to another embodiment of this application, a button battery is provided. The button battery includes the cap assembly described in this application.

[0093] This button cell battery features excellent sealing performance and a high yield rate.

[0094] In one example, the button cell also includes a housing 500, which includes a sidewall 501, one end of which forms an opening, and a cover 100 is sealed to the opening.

[0095] like Figure 9 , Figure 10 As shown, the sidewall 501 forms a cylindrical structure. The cylindrical structure has two opposing openings. At one end of the cylindrical structure, a cover plate 100 is fixed to the sidewall 501 by laser welding, resistance welding, or other methods, sealing the opening at that end. A bottom wall 502 is provided at the other end of the cylindrical structure. The bottom wall 502 is fixed to the sidewall 501 by laser welding, resistance welding, or other methods, sealing the opening at that end. For example, sealant 400 is provided at the middle and outer edge of the insulating rubber ring 200. A receiving cavity is formed within the housing 500, and a battery cell is disposed within the receiving cavity. The battery cell is connected to the cover assembly and the bottom wall 502 via electrode tabs.

[0096] This button cell battery features excellent sealing properties.

[0097] Of course, the method of setting the sealant 400 is not limited to the above embodiments, and those skilled in the art can choose according to actual needs.

[0098] In one example, the cap body 300 is located inside or outside the housing 500.

[0099] like Figure 9 As shown, the cover plate 100 is fixed to one end of the side wall 501 of the housing 500, forming a seal. An insulating rubber ring 200 and a cap body 300 are stacked on the side of the cover plate 100 facing away from the receiving cavity. The surface of the cap body 300 facing away from the boss 301 faces outwards. This surface is used for electrical connection with an external circuit. An annular sealant 400 is provided at the outer edge of the cap body 300 and the insulating rubber ring 200. This sealant 400 effectively protects the insulating rubber ring 200, effectively prevents electrolyte leakage from the receiving cavity, and prevents contaminant accumulation at this location. Sealant 400 is provided between the boss 301 and the side wall 501 of the first through hole 101. This sealant 400 further prevents electrolyte leakage from the receiving cavity.

[0100] like Figure 10 As shown, the cover plate 100 is fixed to one end of the side wall 501 of the housing 500, forming a seal. An insulating rubber ring 200 and a cap body 300 are stacked on the side of the cover plate 100 opposite the receiving cavity. The boss 301 of the cap body 300 faces outward. This boss 301 is used for electrical connection with an external circuit. An annular sealant 400 is provided at the outer edge of the cap body 300 and the insulating rubber ring 200. This sealant 400 effectively protects the insulating rubber ring 200, effectively prevents electrolyte leakage from the receiving cavity, and prevents contaminant accumulation at this location. Sealant 400 is provided between the boss 301 and the side wall of the first through hole 101. This sealant 400 prevents contaminant accumulation at this location and further prevents electrolyte leakage from the receiving cavity.

[0101] Of course, the structure of the housing 500 is not limited to the above embodiments, and those skilled in the art can make settings according to actual needs.

[0102] In one example, as previously described, the sealant 400 is located inside or outside the housing 500.

[0103] In this example, the sealant 400, located inside the housing 500, can directly contact the electrolyte within the receiving cavity, thus providing a good leak-proof effect. For example, as... Figure 5As shown, sealant 400 is provided only between the boss 301 and the sidewall 501 of the first through hole 101. This sealant 400 effectively forms a seal, thereby preventing electrolyte leakage from the cavity. Figure 6 As shown, annular sealant 400 is provided only at the outer edges of the cap body 300 and the insulating ring 200. This sealant 400 effectively protects the insulating ring 200, effectively prevents electrolyte leakage from the cavity, and also prevents contaminants from accumulating there.

[0104] In other examples, the sealant 400 is located outside the housing 500 and can come into contact with the external environment, preventing contaminants from accumulating in the gaps.

[0105] Of course, those skilled in the art can set the amount and placement of sealant 400 according to actual needs.

[0106] In one example, the button cell also includes a battery core 600, which includes a positive electrode sheet, a negative electrode sheet, and a separator wound together in a spiral. The separator is located between the positive electrode sheet and the negative electrode sheet, forming a cavity 603 in the middle of the battery core 600. The cavity 603 is disposed opposite to the boss 301. The positive electrode sheet is connected to a positive tab 601, and the negative electrode sheet is connected to a negative tab 602. The positive tab 601 or the negative tab 602 is flatly disposed between the end face of the battery core 600 and the cover plate 100. The positive tab 601 or the negative tab 602 is connected to the boss 301 and covers the cavity 603. The projection of the sealant 400 on the end face opposite to the boss 301 falls within the projection range of the positive tab 601 or the negative tab 602 on the end face.

[0107] like Figure 9As shown, the battery core 600 is cylindrical. The cap body 300 is located on the upper end face 604 of the housing 500. The boss 301 is exposed in the receiving cavity. A core post may or may not be provided in the middle of the battery core 600. The cavity 603 allows electrolyte to pass through. For example, the positive tab 601 is aluminum foil. The negative tab 602 is copper foil. The positive tab 601 or the negative tab 602 is welded to the boss 301 by laser welding or resistance welding. For example, the positive tab 601 is flatly disposed between the upper end face 604 of the battery core 600 and the cover plate 100. An insulating layer is provided between the positive tab 601 and the battery core 600 to prevent short circuit between the positive and negative electrodes. The positive tab 601 and the negative tab 602 cover the cavity 603. Since the projection of the sealant 400 on the end face opposite to the boss 301 falls within the projection range of the positive tab 601 or the negative tab 602 on the end face, the sealant 400 is completely located within the range of the positive tab 601 or the negative tab 602. This arrangement allows the positive tab 601 or the negative tab 602 to cover the boss 301 and the sealant 400, further reducing the possibility of electrolyte leakage in the cavity and improving the sealing performance of the button cell.

[0108] Of course, in other examples, the battery cell can also be a stacked structure.

[0109] In one example, the positive electrode tab 601 or the negative electrode tab 602 is connected to the boss 301 by welding, with the welding point 301a facing the cavity 603.

[0110] For example, the positive tab 601 or negative tab 602 can be welded to the boss 301 from the outside of the housing 500 using laser welding or resistance welding. The weld point 301a is directly opposite the cavity 603, so that the weld point 301a falls into the cavity 603 instead of onto the positive or negative electrode, thereby avoiding damage to the battery core 600 caused by the heat during welding.

[0111] According to yet another embodiment of this application, an electronic device is provided. This electronic device includes the button battery described in this application.

[0112] The electronic device can be, but is not limited to, wireless earphones, mobile phones, watches, wristbands, walkie-talkies, computers, etc. This electronic device features excellent security performance.

[0113] While specific embodiments of the present invention have been described in detail by way of examples, those skilled in the art should understand that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Those skilled in the art should understand that modifications can be made to the above embodiments without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A cap assembly, characterized in that, include: A cover plate (100) having a first through hole (101) and a first surface; Cap body (300), the cap body (300) having a second surface disposed opposite to the first surface; An insulating rubber ring (200) has a second through hole (202) opposite to the first through hole (101). The cap body (300), the insulating rubber ring (200), and the cover plate (100) are stacked in sequence. The cap body (300), the cover plate (100), and the insulating rubber ring (200) are bonded together. The first surface and the second surface are in contact with two opposite surfaces of the insulating rubber ring (200). At least one of the first surface and the second surface has an uneven and rough structure.

2. The cap assembly according to claim 1, characterized in that, The rough structure is a series of parallel dotted lines (304).

3. The cap assembly according to claim 1, characterized in that, The rough structure includes multiple pits (103).

4. The cap assembly according to claim 3, characterized in that, The plurality of said pits (103) are arranged in an array; or Multiple pits (103) are arranged radially outward from the center of the cover plate (100) or the cap body (300).

5. The cap assembly according to claim 3, characterized in that, The pit (103) is formed by laser etching.

6. The cap assembly according to claim 1, characterized in that, The cover plate (100) and the cap body (300) are circular, the diameter of the cover plate (100) is larger than the diameter of the cap body (300), the first surface has the rough structure in the area opposite to the second surface, and the first surface also has a planar area (102) surrounding the rough structure.

7. The cap assembly according to claim 1, characterized in that, It also includes a sealant (400) that fills the gap between the cap body (300) and the cover plate (100).

8. The cap assembly according to claim 7, characterized in that, The outer edge of the insulating rubber ring (200) protrudes beyond the outer edge of the cap body (300), the outer edge of the cover plate (100) protrudes beyond the outer edge of the insulating rubber ring (200), and the sealant (400) covers the outer edge of the insulating rubber ring (200) and the outer edge of the cover plate (100) body.

9. The cap assembly according to claim 1, characterized in that, The cap body (300) forms a boss (301), the insulating rubber ring (200) is sleeved on the boss (301), and the boss (301) is inserted into the first through hole (101).

10. The cap assembly according to claim 9, characterized in that, The insulating rubber ring (200) has an annular protrusion in the middle, which surrounds the second through hole (202). The boss (301) is located inside the second through hole (202) and abuts against the inner wall of the annular protrusion. The annular protrusion is located inside the first through hole (101) and abuts against the inner wall of the first through hole (101).

11. The cap assembly according to claim 1, characterized in that, The thickness of the rough structure is within 50% of the thickness of the cover plate body.

12. A button cell battery, characterized in that, Includes the cap assembly as described in any one of claims 1-11.

13. The button cell battery according to claim 12, characterized in that, It also includes a housing, the housing having a sidewall with an opening at one end, and a cover plate (100) sealingly disposed at the opening.

14. The button cell battery according to claim 13, characterized in that, The cap body (300) is located inside or outside the housing.

15. An electronic device, characterized in that, Including the button cell as described in any one of claims 12-14.

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