CN110854338A - Explosion-proof structure of button cell and working method thereof - Google Patents
Explosion-proof structure of button cell and working method thereof Download PDFInfo
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- CN110854338A CN110854338A CN201911149295.8A CN201911149295A CN110854338A CN 110854338 A CN110854338 A CN 110854338A CN 201911149295 A CN201911149295 A CN 201911149295A CN 110854338 A CN110854338 A CN 110854338A
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- 229910052782 aluminium Inorganic materials 0.000 claims description 13
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical group [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 13
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 12
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical group [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 10
- 239000010935 stainless steel Substances 0.000 claims description 8
- 229910001220 stainless steel Inorganic materials 0.000 claims description 8
- 230000001681 protective effect Effects 0.000 claims description 7
- 239000010949 copper Substances 0.000 claims description 6
- 229910052802 copper Inorganic materials 0.000 claims description 6
- 239000011889 copper foil Substances 0.000 claims description 6
- 238000006073 displacement reaction Methods 0.000 claims description 5
- 229910052759 nickel Inorganic materials 0.000 claims description 5
- 238000004880 explosion Methods 0.000 abstract description 11
- 239000000463 material Substances 0.000 description 7
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/30—Arrangements for facilitating escape of gases
- H01M50/342—Non-re-sealable arrangements
- H01M50/3425—Non-re-sealable arrangements in the form of rupturable membranes or weakened parts, e.g. pierced with the aid of a sharp member
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
- H01M50/109—Primary casings; Jackets or wrappings characterised by their shape or physical structure of button or coin shape
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/572—Means for preventing undesired use or discharge
- H01M50/574—Devices or arrangements for the interruption of current
- H01M50/578—Devices or arrangements for the interruption of current in response to pressure
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Gas Exhaust Devices For Batteries (AREA)
Abstract
The invention provides an explosion-proof structure of button cell and its working method, its characteristic is: the explosion-proof structure of the button cell comprises an upper shell cover and a lower shell body which are covered, wherein an electrode isolation assembly is arranged in the middle of the lower shell body and the upper shell cover, the electrode isolation assembly comprises a positive electrode plate, a negative electrode plate and an isolation body which is positioned between the positive electrode plate and the negative electrode plate and used for isolating the positive electrode plate and the negative electrode plate, and the electrode isolation assembly is provided with a positive electrode lug and a negative electrode lug which respectively extend towards the upper part and the lower part of the electrode isolation assembly; the positive pole lug is connected with the positive electrode plate, the negative pole lug is connected with the negative electrode plate, at least one or one section of the positive pole lug and the negative pole lug is made of conductive easily-torn sheets, and the other end of the easily-torn sheet is connected with a metal sheet which is used for being fixedly connected with the inner surface of the upper shell cover or the lower shell body. The invention can avoid the phenomenon of explosion caused by overlarge internal pressure of the button cell by utilizing the structure.
Description
The technical field is as follows:
the invention relates to an explosion-proof structure of a button cell and a working method thereof.
Background art:
button cells (button cells) are also called button cells, and refer to cells with the overall dimensions like a small button, generally speaking, the button cells have a larger diameter and a thinner thickness (compared with cylindrical cells such as a cell with a size of 5 AA on the market), the button cells are classified from the aspect of the appearance, and the equivalent corresponding cells are classified into cylindrical cells, square cells, special-shaped cells and the like.
The electrode isolation assembly in the button cell comprises a laminated type button cell and a wound type button cell, and the laminated type button cell and the wound type button cell can have the phenomena of internal short circuit, expansion, explosion and the like in the use process, and when the phenomena occur, the personal safety and the property safety are influenced.
The invention content is as follows:
the invention aims to provide an explosion-proof structure of a button cell and a working method thereof, wherein the explosion-proof structure of the button cell is reasonable in design and is beneficial to avoiding the phenomenon of explosion caused by overlarge internal pressure of the button cell.
The specific embodiment of the invention is as follows: explosion-proof structure of button cell, its characterized in that: the electrode isolation assembly comprises a positive electrode plate, a negative electrode plate and an isolation body positioned between the positive electrode plate and the negative electrode plate and used for isolating the positive electrode plate and the negative electrode plate, and is provided with a positive electrode lug and a negative electrode lug which respectively extend towards the upper part and the lower part of the electrode isolation assembly; the positive pole lug is connected with the positive electrode plate, the negative pole lug is connected with the negative electrode plate, at least one or one section of the positive pole lug and the negative pole lug is made of conductive easily-torn sheets, and the other end of the easily-torn sheet is connected with a metal sheet which is used for being fixedly connected with the inner surface of the upper shell cover or the lower shell body.
Furthermore, the conductive easy-to-tear sheet is an aluminum sheet, an aluminum foil, a copper sheet or a copper foil.
Further, the thickness of the conductive easy-tear sheet is 6-100 micrometers.
Further, the metal sheet is a nickel sheet or a stainless steel sheet.
Further, the thickness of the metal sheet is 0.1 to 0.2 mm.
Furthermore, the metal sheet is circular or oval, the conductive easy-to-tear sheet is rectangular, and the width of the conductive easy-to-tear sheet is smaller than that of the metal sheet, so that a relative concave is formed between the conductive easy-to-tear sheet and the metal sheet.
Furthermore, the inner surfaces of the positive electrode lug, the negative electrode lug and the metal sheet are adhered with insulating patches.
Furthermore, at least one of the upper shell cover and the lower shell is provided with a through hole, and a metal foil layer for covering the through hole is attached to the inner surface of the upper shell cover and/or the lower shell at the through hole.
Further, the thickness of the metal foil layer is 5 to 50 micrometers.
Furthermore, the aperture of the through hole is 2-9 mm, and the metal foil layer is circular and has a diameter of 5-12 mm.
Furthermore, the outer surface of the upper shell cover and/or the lower shell body is provided with an easy-to-tear protective film layer at the through hole for covering the through hole.
Furthermore, at least one of the upper shell cover and the lower shell is provided with a counter bore.
The invention discloses a working method of a button cell explosion-proof structure, which is characterized in that: the explosion-proof structure of the button cell comprises an upper shell cover and a lower shell body which are covered, wherein an electrode isolation assembly is arranged in the middle of the lower shell body and the upper shell cover, the electrode isolation assembly comprises a positive electrode plate, a negative electrode plate and an isolation body which is positioned between the positive electrode plate and the negative electrode plate and used for isolating the positive electrode plate and the negative electrode plate, and the electrode isolation assembly is provided with a positive electrode lug and a negative electrode lug which respectively extend towards the upper part and the lower part of the electrode isolation assembly; the positive electrode tab is connected with the positive electrode plate, the negative electrode tab is connected with the negative electrode plate, at least one or one section of the positive electrode tab and the negative electrode tab is made of a conductive easy-to-tear sheet, and the other end of the easy-to-tear sheet is connected with a metal sheet which is used for being fixedly connected with the inner surface of the upper shell cover or the lower shell body; when the button cell works normally, the positive electrode plate and the negative electrode plate are electrically connected with the upper shell cover and/or the lower shell through the positive electrode lug, the negative electrode lug and the metal sheet, and voltage is output on the upper shell cover and the lower shell; when the internal pressure of the expansion gas generated in the button cell reaches a certain value, the upper shell cover and the lower shell generate bulge or relative displacement, so that the conductive easy-to-tear sheet is torn off, the circuit is broken in the button cell, and the expansion gas is prevented from being generated continuously.
The method for manufacturing the explosion-proof structure of the button cell specifically comprises the following steps:
(1) preparing an upper shell cover, a lower shell and an electrode isolation assembly which are made of stainless steel, wherein the upper part of the electrode isolation assembly extends to form a positive electrode lug, the lower part of the electrode isolation assembly extends to form a negative electrode lug, the whole or one section of the positive electrode lug and/or the negative electrode lug is made of conductive easily-torn sheets, and the conductive easily-torn sheets are aluminum sheets, aluminum foils, copper sheets or copper foils;
(2) the end parts of the positive electrode lug and/or the negative electrode lug are connected with a metal sheet in a welding way, the metal sheet is a nickel sheet or a stainless steel sheet, the inner surfaces of the positive electrode lug and the negative electrode lug can be attached with insulating patches, and the short circuit generated by the contact of the inner surfaces of the positive electrode lug and the negative electrode lug with the edge of the positive electrode sheet or the negative electrode sheet is avoided by attaching the insulating patches;
(3) the lower shell is internally provided with an electrode isolation assembly, and the outer surface of a cathode tab is welded with the middle part of the inner bottom surface of the lower shell;
(4) the metal sheet is welded with the upper shell cover, and the upper shell cover is pressed with the lower shell body.
Furthermore, before the first step, the upper shell cover and/or the lower shell can be provided with a through hole in advance, a metal foil layer for covering the through hole and an easy-to-tear protective film layer for covering the through hole; or at least one of the upper shell cover and the lower shell is provided with a counter bore.
Compared with the prior art, the invention has the following beneficial effects: the invention is beneficial to avoiding the phenomenon of explosion caused by overlarge internal pressure of the button cell by utilizing the structure.
Description of the drawings:
FIG. 1 is a schematic perspective view of an embodiment of an electrode separator assembly, a positive tab and a metal sheet of the present invention (the entire electrode tab is a conductive tear-off sheet);
FIG. 2 is a schematic perspective view of an electrode separator assembly, a positive tab and another embodiment of a metal sheet according to the present invention (a sectional tab is a conductive tearable sheet);
FIG. 3 is a schematic perspective view of an electrode separator assembly, a positive tab and a metal sheet according to another embodiment of the present invention (with an insulating patch);
FIG. 4 is a schematic perspective view of an embodiment of an electrode separator assembly and negative tab of the present invention;
FIG. 5 is a schematic perspective view of an alternative embodiment of an electrode separator assembly, negative tab and metal sheet of the present invention;
FIG. 6 is a schematic cross-sectional view of one embodiment of the present invention;
FIG. 7 is a schematic cross-sectional view of another embodiment of the present invention;
fig. 8 is a schematic cross-sectional view of another embodiment of the present invention.
The specific implementation mode is as follows:
the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
The explosion-proof structure of the button cell of the invention includes covering the upper casing cover 1 and lower casing 2 formed, upper casing cover 1 and lower casing 2 are made of stainless steel material usually, but not exclude other materials to make, there are electrode isolation assemblies 3 in the middle part of said lower casing 2 and upper casing cover 1, the said electrode isolation assembly 3 includes positive electrode sheet, negative electrode sheet and is located between positive electrode sheet, negative electrode sheet and used for isolating the separator of the positive, negative electrode sheet (the electrode isolation assembly 3 can be laminated or coiling type, mainly regard coiling type as the example here), have positive pole lug 4, negative pole lug 5 that extend to the upper portion and lower portion of the electrode isolation assembly separately on the said electrode isolation assembly; the positive electrode tab 4 is connected with the positive electrode plate 6, and the negative electrode tab 5 is connected with the negative electrode plate 7.
At least one or one of the positive electrode lug and the negative electrode lug is made of conductive easily-torn sheets A, namely one or two of the positive electrode lug and the negative electrode lug can be made of the conductive easily-torn sheets A, or one section of the positive electrode lug and the negative electrode lug can be made of the conductive easily-torn sheets A, the mode can realize the function of cutting off a circuit when the internal pressure is too large, the other end of the easily-torn sheets is connected with a metal sheet 8 which is used for being fixedly connected with the inner surface of the upper shell cover or the lower shell body, the metal sheet and the inner surface of the upper shell cover or the lower shell body can be fixedly connected through welding or conductive adhesive, and the like, and the metal sheet 8 and the electrode lug can be welded, connected through conductive adhesive or anchored; the conductive easy-to-tear sheet is easy to tear and break when being pulled by certain external force, thereby cutting off the power supply of the button cell, ensuring the safety of the button cell when the internal pressure is overlarge, and the internal pressure is overlarge due to various reasons, such as overcharge or internal short circuit, etc., when the internal pressure reaches a certain degree, the battery explosion phenomenon can be generated, therefore, the conductive easy-to-tear sheet is connected between the electrode plate and the shell (the upper shell cover 1 and/or the lower shell 2), when the internal pressure is increased to a certain degree (generally, the internal pressure in the battery reaches more than 10Kpa, the danger of explosion exists, therefore, the internal pressure is generally set below 10 Kpa), the upper shell cover 1 and the lower shell 2 are bulged or displaced, namely, the conductive easy-to-tear sheet is torn, the power supply of the button cell is cut off, and the safety of the button cell when the internal pressure is overla.
In one embodiment, the conductive easily-torn sheet is an aluminum sheet, an aluminum foil, a copper sheet or a copper foil, and the aluminum sheet, the aluminum foil, the copper sheet or the copper foil is a softer material with lower strength and is easily torn, but conductive easily-torn sheets made of other materials are also available; in order to design reasonably, facilitate tearing and not influence normal manufacture, installation and use, the thickness of the conductive easy-to-tear sheet is 6-100 microns, the preferable thickness is 15 microns, and the conductive easy-to-tear sheet can be manufactured easily and cannot be damaged easily when being installed and used under normal work.
In one embodiment, the metal sheet is a nickel sheet or a stainless steel sheet, the thickness of the metal sheet is 0.1-0.2 mm, and the metal sheet is a hard and high-strength material, is easy to weld with the shell, and is not easy to break or damage.
In one embodiment, the metal sheet 8 is circular, oval or rectangular, the conductive easy-to-tear sheet a is rectangular, and the width of the conductive easy-to-tear sheet is smaller than that of the metal sheet, so as to form a relative concave 9 between the conductive easy-to-tear sheet and the metal sheet; through above-mentioned structure for electrically conductive easy tear sheet is comparatively easily torn, when the electrically conductive easy tear sheet length of design, it is only slightly longer than the distance of sheetmetal and electrode piece, makes when upper shell cover 1 and casing 2 produce the swell or certain displacement, electrically conductive easy tear sheet can be torn promptly.
In one embodiment, in order to avoid the short circuit between the positive electrode tab, the negative electrode tab and the metal sheet directly contacting the positive electrode tab and the negative electrode tab in the isolator, the insulating patches 10 are attached to the inner surfaces of the positive electrode tab, the negative electrode tab and the metal sheet, the insulating patches 10 may be an insulating tape, such as made of polypropylene, or other insulating materials, and the structure avoids the short circuit caused by the direct contact between the inner surfaces of the positive electrode tab and the negative electrode tab and the edge of the positive electrode sheet or the negative electrode sheet.
In another embodiment, at least one of the upper case cover and the lower case is provided with a through hole 11, a metal foil layer 12 for covering the through hole is adhered on the inner surface of the upper case cover and/or the lower case at the through hole, when the internal pressure of the button cell reaches a certain value (normally, the internal pressure inside the cell reaches more than 10Kpa, there is a risk of explosion, so the internal pressure is generally set below 10 Kpa), the metal foil layer 12 is broken by the internal pressure, thereby the internal pressure of the button cell is released, and the explosion phenomenon of the button cell is avoided, the difference between the embodiment and the above embodiment is the above structure, through at least one or one section of the positive electrode tab and the negative electrode tab is made of the conductive easy-to-tear sheet material a, and the connection structure of the conductive easy-to-tear sheet material a and the metal sheet, when the internal pressure reaches a certain value, the internal pressure can not only be relieved through the, and the air current of internal pressure release also can tear electrically conductive easy tear sheet A off, thereby realize double-deck safety insurance, promptly to certain when pressure increases, and when not causing the casing to appear the swell or relative displacement, also can make electrically conductive easy tear sheet A be torn by the air current, in order to make the air current change in the electrically conductive easy tear sheet A of breaking, this electrically conductive easy tear sheet A is close to as far as possible with the position of through hole 11, because electrically conductive easy tear sheet A sets up in utmost point ear department, utmost point ear is close to the casing edge, therefore, the position setting of through hole 11 is being close to the casing edge, also the position setting of through hole 11 is in keeping away from casing middle part department.
In order to achieve a certain internal pressure at which the foil layer can be broken, the thickness of said foil layer is 5-50 micrometers, preferably 8-10 micrometers, which is designed with reference to an internal pressure above 10Kpa for the risk of explosion.
In order to be reasonable in design, the aperture of the through hole can be 2-9 mm, the metal foil layer is circular, the diameter of the metal foil layer is 5-12 mm, the metal foil layer can be fixed with the inner surface of the upper shell cover and/or the lower shell body in a welding mode, and the metal foil layer can be an aluminum foil layer or an aluminum alloy layer.
Further, in order to protect the metal foil layer from being accidentally broken when not in use, the outer surface of the upper shell cover and/or the lower shell body is provided with an easily torn protective film layer 13 at the through hole for covering the through hole, the easily torn protective film layer 13 is torn when in use, and the easily torn protective film layer 13 can be a plastic film which is fixedly adhered to the outer surface of the upper shell cover and/or the lower shell body through glue.
In another embodiment, at least one of the upper shell cover 1 and the lower shell 2 is provided with a counter bore 14, the counter bore 14 can be arranged on the inner bottom surface or the outer surface of the upper shell cover 1 and/or the lower shell 2, the depth of the counter bore 14 can be one third to five sixths of the thickness of the shell, the shape of the counter bore 14 can be round, oval or rectangular, which may be formed by stamping, chemical etching or laser ablation, etc., the counterbore 14 functions in the same way as the through-hole 11 and the metal foil layer 12, because the counter bores 14 are arranged on the upper shell cover 1 and/or the lower shell 2, the strength of the position is weak, and when a certain pressure is provided in the battery, this position is easily broken to release the pressure, and the internal pressure of the battery is usually 10Kpa or more, which may cause explosion, and therefore, this pressure can be used as a reference when designing the depth of the counterbore 14 or the thickness of the metal foil layer 12.
The above-described configuration of the present application can be applied to a button cell using a wound electrode separator assembly, and can also be applied to a button cell using a stacked electrode separator assembly.
The invention relates to a working method of an explosion-proof structure of a button cell, which comprises an upper shell cover and a lower shell body which are covered, wherein the middle parts of the lower shell body and the upper shell cover are provided with an electrode isolation assembly, the electrode isolation assembly comprises a positive electrode plate, a negative electrode plate and an isolation body which is positioned between the positive electrode plate and the negative electrode plate and is used for isolating the positive electrode plate and the negative electrode plate, and the electrode isolation assembly is provided with a positive electrode lug and a negative electrode lug which respectively extend towards the upper part and the lower part of the electrode isolation assembly; the positive electrode tab is connected with the positive electrode plate, the negative electrode tab is connected with the negative electrode plate, at least one or one section of the positive electrode tab and the negative electrode tab is made of a conductive easy-to-tear sheet, and the other end of the easy-to-tear sheet is connected with a metal sheet which is used for being fixedly connected with the inner surface of the upper shell cover or the lower shell body; when the button cell works normally, the positive electrode plate and the negative electrode plate are electrically connected with the upper shell cover and/or the lower shell through the positive electrode lug, the negative electrode lug and the metal sheet, and voltage is output on the upper shell cover and the lower shell; when the internal pressure of the expansion gas generated in the button cell reaches a certain value, the upper shell cover and the lower shell generate bulge or relative displacement, so that the conductive easy-to-tear sheet is torn off, the circuit is broken in the button cell, and the expansion gas is prevented from being generated continuously.
The method for manufacturing the explosion-proof structure of the button cell specifically comprises the following steps:
(5) preparing an upper shell cover, a lower shell and an electrode isolation assembly which are made of stainless steel, wherein the upper part of the electrode isolation assembly extends to form a positive electrode lug, the lower part of the electrode isolation assembly extends to form a negative electrode lug, the whole or one section of the positive electrode lug and/or the negative electrode lug is made of conductive easily-torn sheets, and the conductive easily-torn sheets are aluminum sheets, aluminum foils, copper sheets or copper foils;
(6) the end parts of the positive electrode lug and/or the negative electrode lug are connected with a metal sheet in a welding way, the metal sheet is a nickel sheet or a stainless steel sheet, the inner surfaces of the positive electrode lug and the negative electrode lug can be attached with insulating patches, and the short circuit generated by the contact of the inner surfaces of the positive electrode lug and the negative electrode lug with the edge of the positive electrode sheet or the negative electrode sheet is avoided by attaching the insulating patches;
(7) the lower shell is internally provided with an electrode isolation assembly, and the outer surface of a cathode tab is welded with the middle part of the inner bottom surface of the lower shell;
(8) the metal sheet is welded with the upper shell cover, and the upper shell cover is pressed with the lower shell body.
Furthermore, before the first step, the upper shell cover and/or the lower shell can be provided with a through hole in advance, a metal foil layer for covering the through hole and an easy-to-tear protective film layer for covering the through hole; or at least one of the upper shell cover and the lower shell is provided with a counter bore.
Compared with the prior art, the invention has the following beneficial effects: the invention is beneficial to avoiding the phenomenon of explosion caused by overlarge internal pressure of the button cell by utilizing the structure.
Any embodiment disclosed herein above is meant to disclose, unless otherwise indicated, all numerical ranges disclosed as being preferred, and any person skilled in the art would understand that: the preferred ranges are merely those values which are obvious or representative of the technical effect which can be achieved. Since the numerical values are too numerous to be exhaustive, some of the numerical values are disclosed in the present invention to illustrate the technical solutions of the present invention, and the above-mentioned numerical values should not be construed as limiting the scope of the present invention.
If the terms "first," "second," etc. are used herein to define parts, those skilled in the art will recognize that: the terms "first" and "second" are used merely to distinguish one element from another in a descriptive sense and are not intended to have a special meaning unless otherwise stated.
Meanwhile, if the invention as described above discloses or relates to parts or structural members fixedly connected to each other, the fixedly connected parts can be understood as follows, unless otherwise stated: a detachable fixed connection (for example using bolts or screws) is also understood as: non-detachable fixed connections (e.g. riveting, welding), but of course, fixed connections to each other may also be replaced by one-piece structures (e.g. manufactured integrally using a casting process) (unless it is obviously impossible to use an integral forming process).
In addition, terms used in any technical solutions disclosed in the present invention to indicate positional relationships or shapes include approximate, similar or approximate states or shapes unless otherwise stated.
Any part provided by the invention can be assembled by a plurality of independent components or can be manufactured by an integral forming process.
Finally, it should be noted that the above examples are only used to illustrate the technical solutions of the present invention and not to limit the same; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art will understand that: modifications to the specific embodiments of the invention or equivalent substitutions for parts of the technical features may be made; without departing from the spirit of the present invention, it is intended to cover all aspects of the invention as defined by the appended claims.
Claims (10)
1. An explosion-proof structure of button cell is characterized in that: the electrode isolation assembly comprises a positive electrode plate, a negative electrode plate and an isolation body positioned between the positive electrode plate and the negative electrode plate and used for isolating the positive electrode plate and the negative electrode plate, and is provided with a positive electrode lug and a negative electrode lug which respectively extend towards the upper part and the lower part of the electrode isolation assembly; the positive pole lug is connected with the positive electrode plate, the negative pole lug is connected with the negative electrode plate, at least one or one section of the positive pole lug and the negative pole lug is made of conductive easily-torn sheets, and the other end of the easily-torn sheet is connected with a metal sheet which is used for being fixedly connected with the inner surface of the upper shell cover or the lower shell body.
2. The explosion-proof structure of button cell battery according to claim 1, characterized in that: the conductive easy-tear sheet is an aluminum sheet, an aluminum foil, a copper sheet or a copper foil; the thickness of the conductive easy-tear sheet is 6-100 microns.
3. The explosion-proof structure of button cell battery according to claim 1, characterized in that: the metal sheet is a nickel sheet or a stainless steel sheet; the thickness of the metal sheet is 0.1-0.2 mm.
4. The explosion-proof structure of button cell battery according to claim 1, characterized in that: the metal sheet is circular or oval, and electrically conductive easy tear sheet is the rectangle, and the width of electrically conductive easy tear sheet is less than the width of metal sheet to form relative indent between electrically conductive easy tear sheet and metal sheet.
5. The explosion-proof structure of button cell battery according to claim 1, characterized in that: and the inner surfaces of the positive electrode lug, the negative electrode lug and the metal sheet are adhered with insulating patches.
6. The explosion-proof structure of button cell battery according to claim 1, characterized in that: at least one of the upper shell cover and the lower shell is provided with a through hole, and a metal foil layer for covering the through hole is attached to the inner surface of the upper shell cover and/or the inner surface of the lower shell at the through hole.
7. The explosion-proof structure of button cell battery according to claim 6, characterized in that: the thickness of the metal foil layer is 5-50 microns; the aperture of the through hole is 2-9 mm, the metal foil layer is circular, and the diameter of the metal foil layer is 5-12 mm.
8. The explosion-proof structure of button cell battery according to claim 6, characterized in that: and the outer surface of the upper shell cover and/or the lower shell body is provided with an easy-to-tear protective film layer at the through hole for covering the through hole.
9. The explosion-proof structure of button cell battery according to claim 1, characterized in that: at least one of the upper shell cover and the lower shell is provided with a counter bore.
10. A working method of an explosion-proof structure of a button cell is characterized in that: the explosion-proof structure of the button cell comprises an upper shell cover and a lower shell body which are covered, wherein an electrode isolation assembly is arranged in the middle of the lower shell body and the upper shell cover, the electrode isolation assembly comprises a positive electrode plate, a negative electrode plate and an isolation body which is positioned between the positive electrode plate and the negative electrode plate and used for isolating the positive electrode plate and the negative electrode plate, and the electrode isolation assembly is provided with a positive electrode lug and a negative electrode lug which respectively extend towards the upper part and the lower part of the electrode isolation assembly; the positive electrode tab is connected with the positive electrode plate, the negative electrode tab is connected with the negative electrode plate, at least one or one section of the positive electrode tab and the negative electrode tab is made of a conductive easy-to-tear sheet, and the other end of the easy-to-tear sheet is connected with a metal sheet which is used for being fixedly connected with the inner surface of the upper shell cover or the lower shell body; when the button cell works normally, the positive electrode plate and the negative electrode plate are electrically connected with the upper shell cover and/or the lower shell through the positive electrode lug, the negative electrode lug and the metal sheet, and voltage is output on the upper shell cover and the lower shell; when the internal pressure of the expansion gas generated in the button cell reaches a certain value, the upper shell cover and the lower shell generate bulge or relative displacement, so that the conductive easy-to-tear sheet is torn off, the circuit is broken in the button cell, and the expansion gas is prevented from being generated continuously.
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| CN201911149295.8A CN110854338A (en) | 2019-11-21 | 2019-11-21 | Explosion-proof structure of button cell and working method thereof |
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| CN201911149295.8A CN110854338A (en) | 2019-11-21 | 2019-11-21 | Explosion-proof structure of button cell and working method thereof |
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