CN111883716A

CN111883716A - Miniature button cell seals and explosion-proof construction

Info

Publication number: CN111883716A
Application number: CN202010894216.2A
Authority: CN
Inventors: 王君
Original assignee: Ningbo Wanheng Battery Accessories Co ltd
Current assignee: Ningbo Wanheng Battery Accessories Co ltd
Priority date: 2020-08-31
Filing date: 2020-08-31
Publication date: 2020-11-03

Abstract

The invention provides a miniature button cell sealing and explosion-proof structure which comprises a shell with an opening at the upper end, wherein the side wall of the shell is bent inwards to form a supporting part, the upper end of the supporting part forms a sealing component mounting area, a sealing component is arranged in the sealing component mounting area, the sealing component comprises a supporting ring, a sealing ring and an upper cover body, the lower end of the supporting ring is contacted with the supporting part, the sealing ring is arranged on the upper surface of the supporting ring, an annular groove with an inward opening is arranged on the sealing ring, the edge of the upper cover body is clamped in the annular groove, and the opening end at the upper end of the shell is bent inwards to form a pressing part for pressing the sealing component. The miniature button cell sealing and explosion-proof structure has the advantages of compact structure, small occupied space, good sealing effect, explosion-proof effect and high safety coefficient.

Description

Miniature button cell seals and explosion-proof construction

Technical Field

The invention relates to a miniature button cell, in particular to a miniature button cell sealing and explosion-proof structure.

Background

With the continuous development of microelectronic technology, the coming of 5G, the number of miniaturized electronic devices, such as bluetooth earphones, wireless micro cameras, etc., smart glasses, etc., is increasing, and since the size of the devices itself is small, the space for mounting components inside the devices is small, so that the size of the battery needs to be reduced as much as possible under the condition that the capacity of the battery is constant, or the capacity of the battery needs to be increased as much as possible under the condition that the size is constant; the miniaturized device has small volume, adopts a miniature button cell battery which is small in volume and is usually a lithium battery. The lithium battery adopts a spiral winding structure and is formed by spacing a polyethylene film isolating material with very fine and strong permeability between a positive electrode and a negative electrode. The positive electrode comprises a current collector consisting of lithium cobaltate (or lithium nickel cobalt manganese oxide, lithium manganate, lithium iron phosphate and the like) and an aluminum foil, and the negative electrode comprises a current collector consisting of a graphitized carbon material and a copper foil. The existing battery sealing structure occupies a large space, and the rising space of a density space is small, so that the capacity is low under the same volume or the volume is large under the same volume.

And the traditional micro battery has no explosion-proof function, and has certain potential safety hazard when the internal pressure is too high.

Disclosure of Invention

【1】 Technical problem to be solved

The invention aims to solve the technical problem of providing a miniature button cell sealing and explosion-proof structure which is stable in sealing, small in occupied space and has an explosion-proof function.

【2】 Technical scheme for solving problems

The invention provides a sealing and explosion-proof structure of a miniature button cell, which comprises a shell 1 with an open upper end, wherein the side wall of the shell 1 is bent inwards to form a supporting part 101, the upper end of the supporting part forms a sealing component mounting area, a sealing component is arranged in the sealing component mounting area, the sealing component comprises a supporting ring 2, a sealing ring 3 and an upper cover body 4, the lower end of the supporting ring 2 is contacted with the supporting part 101, the sealing ring 3 is arranged on the upper surface of the supporting ring 2, an annular groove with an inward opening is arranged on the sealing ring, the edge of the upper cover body is clamped in the annular groove, and the open upper end of the shell is bent inwards to form a pressing part 11 for pressing the sealing component.

Further, the lower end inner wall of the sealing ring 3 extends downwards and forms a limiting part 31 attached to the inner wall of the support ring.

Further, the support ring 2 is made of metal.

Further, the support ring 2 is made of 316 stainless steel.

Further, the radial width L2 of the support ring is more than or equal to 0.6mm and less than or equal to 1.2mm, and the thickness of the support ring is more than or equal to 0.12mm and less than or equal to 0.25 mm.

Further, the height L1 of the protrusion of the support part is greater than or equal to 0.1mm and less than or equal to 0.4 mm.

Further, the sealing assembly further comprises a lower cover body 5 arranged at the lower end of the upper cover body 4, the edge of the lower cover body 5 is clamped in the annular groove, the lower cover body protrudes downwards to form a deformation structure, and an exhaust port 41 used for exhausting gas between the upper cover body and the lower cover body when the deformation structure deforms under pressure and protrudes upwards is formed in the upper cover body.

Furthermore, the height of the bulge of the deformation structure on the lower cover body is more than or equal to 0.3mm and less than or equal to 0.7 mm.

Furthermore, the upper surface and/or the lower surface of the upper cover body are/is provided with an annular groove and form an explosion-proof line.

Furthermore, the upper surface and/or the lower surface of the upper cover body and/or the lower cover body are/is provided with an annular groove to form an explosion-proof line.

Furthermore, the thickness of the upper cover body or the lower cover body on the explosion-proof line is more than or equal to 0.03mm and less than or equal to 0.05 mm.

【3】 Advantageous effects

According to the miniature button cell sealing and explosion-proof structure, the rigid support of the sealing ring is improved by arranging the support ring, so that the overall sealing performance is improved, the occupied space of the sealing structure is reduced, and the cell capacity is improved or reduced at a certain time when the capacity is constant; the lower cover body is arranged and reversely deforms when being pressed, so that the internal space is enlarged, and explosion is avoided; an explosion-proof wire is arranged, and the wire is torn when the pressure exceeds a certain value, so that explosion is avoided; the miniature button cell sealing and explosion-proof structure has the advantages of compact structure, small occupied space, good sealing effect, explosion-proof effect and high safety coefficient.

Drawings

Fig. 1 is a schematic structural diagram of a first embodiment of a sealing and explosion-proof structure of a miniature button cell according to the present invention;

FIG. 2 is an enlarged view of portion A of FIG. 1;

fig. 3 is a schematic structural view of a second embodiment of the sealing and explosion-proof structure of the miniature button cell of the present invention;

FIG. 4 is an enlarged view of portion B of FIG. 3;

fig. 5 is a schematic structural view of a third embodiment of the sealing and explosion-proof structure of the miniature button cell of the present invention;

fig. 6 is a structural schematic view of the lower case of a third embodiment of the sealing and explosion-proof structure of the miniature button cell of the present invention reflecting deformation;

FIG. 7 is an enlarged view of portion C of FIG. 5;

fig. 8 is a schematic structural view of a fourth embodiment of the sealing and explosion-proof structure of the miniature button cell of the present invention;

fig. 9 is a structural schematic view of the lower case rebounding deformation of a fourth embodiment of the sealing and explosion-proof structure of the miniature button cell of the present invention;

FIG. 10 is an enlarged view of portion D of FIG. 8;

fig. 11 is a schematic structural view of a fifth embodiment of the sealing and explosion-proof structure of the miniature button cell of the present invention;

fig. 12 is a structural schematic view of the lower case rebounding deformation of the fifth embodiment of the sealing and explosion-proof structure of the miniature button cell of the present invention;

FIG. 13 is an enlarged view of section E of FIG. 11;

fig. 14 is another structural diagram of the supporting portion of the sealing and explosion-proof structure of the miniature button cell of the present invention;

FIG. 15 is an enlarged view of portion F of FIG. 14;

Detailed Description

The following describes embodiments of the invention in detail with reference to the accompanying drawings.

Referring to fig. 1 to 15, the invention provides a sealing and explosion-proof structure for a micro button cell, which includes a housing 1 with an open upper end, the housing is a cylindrical structure, the sidewall of the housing 1 is bent inward to form a support part 101, the height L1 of the support part (towards the housing axis direction) is greater than or equal to 0.1mm and less than or equal to 0.4mm, the upper end of the support part forms a seal assembly mounting area, a seal assembly is arranged in the seal assembly mounting area, the support part contacts with the lower end of the seal assembly for axially limiting the seal assembly, the seal assembly in the application includes a support ring 2, a seal ring 3 and an upper cover 4, the support ring 2 is made of metal material, preferably, the support ring 2 is made of 316 stainless steel, the support ring is annular as a whole, the radial width L2 of the support ring is greater than or equal to 0.6mm and less than or equal to 1.2mm, the thickness of the support ring is greater than, the lower end of the support ring 2 is contacted with a support part 101, the support part plays a role of supporting the support ring, the seal ring 3 is arranged on the upper surface of the support ring 2, the seal ring is made of rubber, the inner wall of the seal ring is provided with an annular groove with an inward opening (towards the axis of the shell), the annular groove is formed by extruding a cylindrical structure at the upper end of the seal ring by the curled edge of the shell, the inner wall at the lower end of the seal ring 3 extends downwards and forms a limiting part 31, and the outer wall of the limiting part is attached to the inner wall of; the upper cover body is round as a whole, the edge of the upper cover body is clamped in the annular groove, the open end of the upper end of the shell is bent inwards to form a pressing part 11, and the pressing part can press the sealing assembly to enable the sealing ring inside to form interference fit, so that fixation is realized and the sealing performance is improved; after the compression, under the influence of stress, the limiting part 31 at the lower end of the sealing ring is attached to the inner wall of the compression support ring to play a role in radial limiting, so that the sealing effect is prevented from being influenced by large deformation generated by the stress of the sealing ring; in order to make it have explosion-proof effect, set up the annular groove 41 on the upper surface or lower surface or upper surface and lower surface at the same time of the upper cover, the annular groove forms the explosion-proof line, because the thickness of the upper cover is smaller, therefore, in the actual production and processing, the annular groove is the score on the surface of upper cover through the cutting tool, the thickness of the cover located on the annular groove is greater than or equal to 0.04mm and is less than or equal to 0.06mm, when the internal pressure exceeds the tolerance, the upper cover tears and makes the internal pressure release along the score. In order to further improve the explosion-proof effect, the sealing assembly in the application also comprises a lower cover body 5 arranged at the lower end of the upper cover body 4, the whole lower cover body is also circular, the edge of the lower cover body 5 is clamped in the annular groove, the edge of the lower cover body is attached to the lower surface of the edge of the upper cover body, the lower cover body protrudes downwards to form a deformation structure, the protruding height of the deformation structure in the application is more than or equal to 0.3mm and less than or equal to 0.7mm, preferably 0.5mm, in order to improve the rebound effect, the deformation structure is an arc-shaped bulge, and the upper cover body is provided with a plurality of exhaust ports 41 which are uniformly distributed in the circumferential direction, the deformation structure will deform and bulge (rebound) after being pressed beyond a threshold value, and because of the gap between the lower cover body and the upper cover body, when the deformation structure is convex, the gap becomes smaller, and the exhaust port 41 can exhaust the excess air when the gap is reduced; in order to improve the explosion-proof effect, in the present application, an annular groove 501 is formed on the upper surface or the lower surface of the lower cover body or on the upper surface or the lower surface of the lower cover body at the same time, and an explosion-proof line is formed, and as above, because the thickness of the lower cover body is small, when in actual production and processing, the annular groove is a scribed line on the surface of the lower cover body through a cutter, the thickness of the cover body on the annular groove is greater than or equal to 0.04mm and less than or equal to 0.06mm, and when the internal pressure exceeds a bearing value, the upper cover body is torn along the scribed line and releases the internal pressure, thereby.

The sealing ring is provided with a first sealing part between the upper surface of the support ring and the lower surface of the upper cover body (or the lower cover body), a second sealing part 33 between the wrapping edge and the upper surface of the upper cover body, and a third sealing part 32 connected between the first sealing part and the second sealing part, wherein the first sealing part and the second sealing part are axially (end face) sealed, the third sealing part is positioned between the inner wall of the shell and the edge of the upper cover body or the lower cover and is used for radial sealing, the thicknesses of the first sealing part, the second sealing part and the third sealing part are 0.15mm-0.25mm, and the radial thickness of the limiting part positioned at the end part of the first sealing part is 0.15mm-0.25 mm.

The thickness of the shell, the upper cover body and the lower cover body is more than or equal to 0.12mm and less than or equal to 0.2 mm.

In order to avoid the influence on the fixing precision and the fixing effect caused by elastic deformation during the forming of the pressing part, the shell is tempered to eliminate the internal stress.

The following examples are described in detail.

In the first embodiment, referring to fig. 1 and fig. 2, in the present embodiment, the casing includes a casing 1 with an open upper end, a side wall of the casing 1 is bent inward to form a supporting portion 101, an upper end of the supporting portion forms a sealing assembly mounting area, an inner diameter of the mounting area is slightly larger than an inner diameter of a main body at a lower end of the casing, an upper end of the supporting portion is provided with a supporting ring 2, an upper end of the supporting ring is provided with a sealing ring, an inner wall at a lower end of the sealing ring 3 extends downward to form a limiting portion 31 attached to an inner wall of the supporting ring, and when the wrapping edge presses and fastens the sealing assembly, the limiting portion can attach; this example is the basic design of the present application. The design has good overall sealing effect, the space of the sealing assembly is small, and compared with the traditional sealing structure, the space occupancy rate of the sealing assembly adopting the structure is reduced by 8% -15%, so that the battery capacity is improved at a certain time when the volume is large, or the volume is reduced at a certain time when the volume is large.

In the second embodiment, referring to fig. 3 and 4, the difference from the first embodiment is that an annular groove is formed on the upper surface or the lower surface of the upper cover or both the upper surface and the lower surface of the upper cover and an explosion-proof line is formed, and during actual production, the annular groove is a notched groove line, and when the internal pressure exceeds a certain value, the explosion-proof line tears and releases the internal gas or liquid to prevent explosion.

Third embodiment, referring to fig. 5 to 7, it is different from the first embodiment in that a lower cover is disposed at a lower end of an upper cover, the lower cover integrally protrudes downward to form a deformation structure, and one or more vents are disposed on the upper cover, so that when the internal pressure exceeds a certain value, the deformation structure on the lower cover protrudes upward (i.e., rebounds), referring to fig. 6, thereby increasing the internal volume of the battery and preventing explosion.

In the fourth embodiment, referring to fig. 8 to 10, the difference from the third embodiment is that an explosion-proof line 501 is provided at the upper end or the lower end of the lower cover body or at both the upper end and the lower end, when the internal pressure exceeds a certain value, the lower cover body protrudes upward and then tears along the explosion-proof line, the upper case blocks the lower case to prevent it from flying, and the internal gas or liquid is discharged from the gas outlet of the side wall of the upper case to prevent explosion.

In the fifth embodiment, referring to fig. 11 to 13, the difference from the third embodiment is that an explosion-proof line 401 is provided on the upper cover, when the internal pressure exceeds a certain value, the lower cover deforms convexly and butts against the upper cover, and when the force applied to the upper cover exceeds a certain value, the upper cover tears along the explosion-proof line, so that the load of the pressure on the lower cover is reduced, the safety is improved, and the explosion is avoided.

In a sixth embodiment, referring to fig. 14-15, the difference between the embodiments is that the support part on the casing is extruded to form a protrusion, so that an annular groove is formed outside the casing, and the inner diameter of the seal mounting region at the upper end of the support part is the same as that of the battery assembly mounting region at the lower end of the support part.

In the application, the pressure of deformation inversion (from downward projection to upward projection) of the lower cover body is 0.1MPa to 0.13MPa, and the pressure of tearing (explosion-proof) of an explosion-proof line on the lower cover body or the upper cover body is 0.2MPa to 0.23 MPa.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the technical principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims

1. The utility model provides a miniature button cell seals and explosion-proof construction which characterized in that: including the open casing in upper end, the lateral wall of casing inwards bends and forms the supporting part, the upper end of supporting part forms the seal assembly installing zone, be equipped with seal assembly in the seal assembly installing zone, seal assembly includes support ring, sealing washer and upper cover body, the lower extreme of support ring with the supporting part contact, the sealing washer sets up the support ring upper surface, be equipped with the inward annular groove of opening on the sealing washer, the border card of upper cover body is established in the annular groove, the upper end opening end of casing inwards bends and forms and is used for compressing tightly seal assembly's portion that compresses tightly.

2. A miniature button cell seal and explosion proof structure as defined in claim 1, wherein: the lower end inner wall of the sealing ring extends downwards and forms a limiting part which is attached to the inner wall of the support ring.

3. A miniature button cell seal and explosion proof structure as defined in claim 1, wherein: the support ring is made of metal.

4. A miniature button cell seal and explosion proof structure as defined in claim 1, wherein: the sealing assembly further comprises a lower cover body arranged at the lower end of the upper cover body, the edge of the lower cover body is clamped in the annular groove, the lower cover body protrudes downwards to form a deformation structure, and an exhaust port used for exhausting gas between the upper cover body and the lower cover body when the deformation structure is pressed to deform and protrudes upwards is formed in the upper cover body.

5. A miniature button cell sealing and explosion proof structure as defined in any one of claims 1 to 3, wherein: and the upper surface and/or the lower surface of the upper cover body are/is provided with annular grooves to form explosion-proof lines.

6. A miniature button cell seal and explosion proof structure according to claim 4, wherein: and the upper surface and/or the lower surface of the upper cover body and/or the lower cover body are/is provided with an annular groove to form an explosion-proof line.