CN113488692A - Button cell explosion-proof sealing structure, button cell and packaging method thereof - Google Patents

Button cell explosion-proof sealing structure, button cell and packaging method thereof Download PDF

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Publication number
CN113488692A
CN113488692A CN202110909979.4A CN202110909979A CN113488692A CN 113488692 A CN113488692 A CN 113488692A CN 202110909979 A CN202110909979 A CN 202110909979A CN 113488692 A CN113488692 A CN 113488692A
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China
Prior art keywords
explosion
proof
cover plate
column
shell
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CN202110909979.4A
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Chinese (zh)
Inventor
廖建华
邬永缜
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Dongguan Lidea Electronics Co ltd
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Dongguan Lidea Electronics Co ltd
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Priority to CN202110909979.4A priority Critical patent/CN113488692A/en
Publication of CN113488692A publication Critical patent/CN113488692A/en
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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
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • 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
    • 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
    • H01M50/147—Lids or covers
    • H01M50/148—Lids or covers characterised by their shape
    • H01M50/153—Lids or covers characterised by their shape for button or coin cells
    • 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
    • H01M50/147—Lids or covers
    • H01M50/166—Lids or covers characterised by the methods of assembling casings with lids
    • H01M50/169—Lids or covers characterised by the methods of assembling casings with lids by welding, brazing or soldering
    • 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
    • H01M50/183—Sealing members
    • H01M50/186—Sealing members characterised by the disposition of the sealing members
    • 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
    • H01M50/183—Sealing members
    • H01M50/186—Sealing members characterised by the disposition of the sealing members
    • H01M50/188—Sealing members characterised by the disposition of the sealing members the sealing members being arranged between the lid and terminal
    • 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
    • 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
    • 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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Sealing Battery Cases Or Jackets (AREA)

Abstract

The invention discloses an explosion-proof sealing structure of a button cell, the button cell and a packaging method thereof, and relates to the technical field of cell structures. The explosion-proof sealing structure comprises a shell with a bottom surface and a side wall extending around the edge of the bottom surface, wherein the edge of the upper end of the shell is connected with a cover plate in a sealing way, the cover plate and the shell form a hollow cavity, and an explosion-proof hole is formed in the cover plate; the outer side of the cover plate is provided with an electrode plate, one side of the electrode plate is integrally connected with an explosion-proof column matched with the explosion-proof hole, and the explosion-proof column extends into the accommodating cavity along the explosion-proof hole; and sealing insulating layers are arranged between the electrode plate and the cover plate and between the explosion-proof column and the cover plate. The sealing structure is compact in connection, the explosion-proof hole is sealed through the explosion-proof column, when the air pressure in the containing cavity is increased, the explosion-proof column is ejected out to achieve the effect of pressure relief of the explosion-proof hole, and the shell is prevented from expanding and exploding; the edge of the explosion-proof hole integrally extends along the direction of the containing cavity to form a clamping sleeve, the explosion-proof column is clamped and fixed in the clamping sleeve, and a sealing insulating layer is arranged between the explosion-proof column and the inner wall of the clamping sleeve, so that the sealing insulating property is good.

Description

Button cell explosion-proof sealing structure, button cell and packaging method thereof
Technical Field
The invention belongs to the technical field of battery structures, and particularly relates to an explosion-proof sealing structure of a button battery, the button battery and a packaging method of the button battery.
Background
Rechargeable lithium ion batteries are widely used in button cells in portable electronic devices such as mobile phones and bluetooth headsets. In smaller, more sophisticated devices, battery volumetric energy density is a critical consideration, such as in hearing aids, wireless bluetooth headsets, electronic watches, gastrointestinal lens swallowing devices, etc.; due to the high requirement on the volume of the rechargeable lithium ion battery, in order to reduce the volume of the battery and ensure the application effect of the battery, button batteries with spirally wound or laminated electrodes are mostly adopted, so that the energy density is improved in a limited volume.
Traditional button cell generally is two tube-shape epitheca and inferior valve, and through cup jointing epitheca and inferior valve together, is equipped with sealing insulation layer in the centre, because button cell whole volume is limited, and epitheca, inferior valve, sealing washer all have thickness, can only be through the volume in compression battery chamber in order to guarantee whole volume size unchangeable. Meanwhile, when the button battery is abnormally charged and discharged or the positive electrode and the negative electrode are in short circuit, the temperature inside the shell can be sharply increased, the pressure inside the shell can be increased and the shell can expand due to gas generated by electrolyte, and finally the button battery can explode to cause safety accidents. The mode that current button cell adopted explosion-proof hole usually, also be exactly set up a through-hole that link up inside and outside at button cell's lid, its purpose is when the unexpected circumstances that takes place button cell explosion under, can regard as the guide with this through-hole, make the explosive force that produces in the twinkling of an eye along with this explosion-proof hole outwards releases partly or most, play the effect of a buffering, and then make button cell subassembly including the lid avoid more serious damage, the setting up of this through-hole probably can make originally sealed intact electrolyte along this through-hole seepage to outside electronic equipment, cause the pollution. Chinese patent publication No. CN111525070A discloses a button cell, in which a through hole communicated with an accommodating cavity is formed in a housing, and the through hole is sealed by an explosion-proof membrane located in the accommodating cavity, so as to ensure that the accommodating cavity is sealed from the outside when the button cell is in normal use; the rupture membrane can melt at the temperature of predetermineeing to the rupture membrane melts when guaranteeing button cell to take place unusual charge-discharge or positive negative pole short circuit, and the gas in the holding intracavity can be discharged by the through-hole. Although the patent avoids electrolyte from leaking to the external electronic equipment along the through hole when the battery is normally used to a certain extent by melting the explosion-proof film, the button cell has poor corrosion resistance and short service cycle compared with a sealed stainless steel shell.
Disclosure of Invention
The invention aims to solve the problems of the existing battery sealing structure, and provides the button battery explosion-proof sealing structure and the button battery which have the advantages of simple and compact structure, low manufacturing cost, long service life, good sealing performance, explosion-proof function and capacity of increasing the volume of a battery accommodating cavity.
In order to solve the technical problems, the invention is realized by the following technical scheme:
an explosion-proof sealing structure of a button battery comprises a shell with a bottom surface and a side wall extending around the edge of the bottom surface, wherein the edge of the upper end of the shell is connected with a cover plate in a sealing manner, the cover plate and the shell form a hollow cavity, and an explosion-proof hole is formed in the cover plate; an electrode plate is arranged on the outer side of the cover plate, an explosion-proof column matched with the explosion-proof hole is integrally connected to one side of the electrode plate, and the explosion-proof column extends into the accommodating cavity along the explosion-proof hole; and a sealing insulating layer is arranged between the electrode plate and the cover plate and between the explosion-proof column and the cover plate.
Preferably, the edge of the explosion-proof hole integrally extends along the direction of the accommodating cavity to form a clamping sleeve, the explosion-proof column is tightly matched in the clamping sleeve, and a sealing insulating layer is arranged between the explosion-proof column and the inner wall of the clamping sleeve.
Preferably, the explosion-proof hole and the clamping sleeve are coaxially arranged with the cover plate.
Preferably, the electrode plate is in a wafer shape, and the explosion-proof column is perpendicular to one side of the electrode plate and is coaxially arranged with the electrode plate.
Preferably, the clamping sleeve is a hollow cylinder or a hollow polygonal column; the explosion-proof column is a cylinder or a polygonal column.
Preferably, the radius of the electrode plate is greater than or equal to half of the radius of the cover plate.
Preferably, the length of the explosion-proof column is greater than or equal to half of the height of the cavity.
Preferably, the edge of one end of the side wall of the shell, which is far away from the bottom surface, is welded with the edge of the cover plate into a whole.
Preferably, the material of the sealing and insulating layer comprises one or more of polypropylene, propylene-ethylene copolymer, polyetheretherketone and polyvinylidene fluoride.
A button battery comprises the button battery explosion-proof sealing structure; the explosion-proof battery is characterized by further comprising an electrode assembly and electrolyte, wherein the electrode assembly and the electrolyte are located in the accommodating cavity, one side of the electrode assembly is connected to the shell or the cover plate through an anode conductor, the other side of the electrode assembly is connected with the explosion-proof column through a cathode conductor, and an insulating pad is arranged between the electrode assembly and the bottom surface of the shell.
Preferably, the electrode assembly has a spiral or laminated structure; the positive electrode conductor is an aluminum foil with the thickness of 0.006-0.018mm, the negative electrode conductor is a copper foil with the thickness of 0.006-0.016mm, and the positive electrode conductor and the negative electrode conductor are in rectangular, strip or strip structures.
A packaging method of a button cell comprises the following steps:
s1, coating the periphery and the inner wall of the explosion-proof hole with a sealing insulating layer;
s2, attaching and bonding the electrode plate to the sealing insulating layer on one side of the cover plate, inserting the explosion-proof column along the explosion-proof hole, and performing interference fit between the explosion-proof column and the explosion-proof hole through the sealing insulating layer;
s3, the explosion-proof column penetrates through the center of the electrode assembly, one side of the electrode assembly is connected to the shell or the cover plate through the positive electrode conductor in a spot welding mode, and the other side of the electrode assembly is connected with the explosion-proof column through the negative electrode conductor;
s4, placing an insulating pad at the bottom of the containing cavity, and placing the explosion-proof column and the electrode assembly in the containing cavity;
s5, injecting electrolyte into the cavity;
and S6, welding the edge of one end of the side wall of the shell far away from the bottom surface and the edge of the cover plate into a whole by laser.
Compared with the prior art, the invention has the beneficial effects that: the button battery explosion-proof sealing structure comprises a shell with a bottom surface and a side wall extending around the edge of the bottom surface, wherein the edge of the upper end of the shell is connected with a cover plate in a sealing manner, the cover plate and the shell form a hollow containing cavity, and an explosion-proof hole is formed in the cover plate; the outer side of the cover plate is provided with an electrode plate, one side of the electrode plate is integrally connected with an explosion-proof column matched with the explosion-proof hole, and the explosion-proof column extends into the accommodating cavity along the explosion-proof hole; and a sealing insulating layer is arranged between the electrode plate and the explosion-proof column and the cover plate. This seal structure connects compactly, through the explosion-proof post sealed explosion-proof hole, when holding the intracavity air pressure increase, with the explosion-proof post liftout effect that reaches explosion-proof hole pressure release, prevent the casing inflation explosion, moreover, the steam generator is simple in structure, low in manufacturing cost, be equipped with sealing insulation layer between explosion-proof post and the explosion-proof hole, the edge in explosion-proof hole forms the solid cover of card along holding the integrative extension of chamber direction, the explosion-proof post card is fixed in the solid cover of card, and with the card be equipped with sealing insulation layer between the inner wall of solid cover, when having explosion-proof function, sealing insulation performance is good.
Compared with the existing button battery, the button battery has the advantages that the upper shell and the lower shell are sleeved together, and the insulating ring is added in the middle; the upper cover and the shell are sealed by laser welding, a sealing insulating layer is arranged between the explosion-proof column and the explosion-proof hole, meanwhile, the edge of the explosion-proof hole integrally extends along the direction of the containing cavity to form a clamping sleeve, and the clamping sleeve is clamped into the center of the electrode assembly, so that the sealing insulating area between the explosion-proof column and the explosion-proof hole is increased, the sealing performance is improved, and the electrolyte is prevented from leaking out to corrode electric equipment; meanwhile, the battery has an explosion-proof effect, when the air pressure in the accommodating cavity is increased and the shell expands, the explosion-proof column is extruded to break away from the explosion-proof hole, so that the pressure is relieved, and serious accidents caused by expansion explosion or ignition of the button battery are avoided.
The packaging method of the button cell is convenient and fast to operate, high in production efficiency, large in capacity of the produced button cell, good in sealing performance and stability and capable of achieving an explosion-proof function.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a button cell in an embodiment of the invention;
FIG. 2 is an exploded view of a button cell according to an embodiment of the present invention;
in the figure: the explosion-proof structure comprises a shell 1, a cover plate 2, a clamping sleeve 3, an electrode plate 4, an explosion-proof column 5, a sealing insulating layer 6, an explosion-proof hole 7, an electrode assembly 8, an insulating pad 9, an anode conductor 10 and a cathode conductor 11.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, the present application is described in further detail with reference to the accompanying drawings and the detailed description.
In the description of the present application, it is to be understood that the terms "intermediate," "top," "bottom," "inner," "outer," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present application and simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated in a particular orientation, and thus should not be construed as limiting the present application. The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
In addition, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are intended to be inclusive and mean, for example, that there may be a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact of the first and second features, or may comprise contact of the first and second features not directly but through another feature in between. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
Example 1: referring to fig. 1 and 2, an explosion-proof sealing structure for a button cell is mainly used for a housing of a battery, especially for a button cell, and the technical solution proposed in this embodiment aims to avoid adverse effects on an electronic device or a user of the electronic device due to sudden explosion or expansion of the battery, and to further improve the structural stability of a cover and the battery due to the explosion-proof structure. The structure comprises a shell 1 with a bottom surface and a side wall extending around the edge of the bottom surface, wherein the shell 1 is a cylindrical structure with an open upper end in the embodiment; the battery also comprises a cover plate 2 which is hermetically connected with the edge of the upper end of the shell 1, the cover plate 2 is connected with the shell 1 to form a hollow cavity, the shell 1 and the cover plate 2 are both made of stainless steel materials, and the shell 1 and the cover plate 2 which are made of the stainless steel materials can prevent the battery from being corroded, so that the service life of the battery is prolonged; the anti-explosion cover plate is characterized by further comprising a buffering piece with a T-shaped cross section, the buffering piece is also made of stainless steel materials, an anti-explosion hole 7 is formed in the cover plate 2, the buffering piece is used for sealing the anti-explosion hole 7, and a sealing insulating layer 6 is arranged between the buffering piece and the anti-explosion hole 7. Specifically, the buffer part comprises an electrode plate 4 arranged on the outer side of the cover plate 2, in the embodiment, the electrode plate 4 is attached to the outer side of the cover plate 2, and a sealing insulating layer 6 is arranged between the electrode plate 4 and the cover plate 2; the buffer piece also comprises an explosion-proof column 5 integrally connected to one side of the electrode plate 4, the explosion-proof column 5 is matched with the explosion-proof hole 7, and the explosion-proof column 5 extends into the containing cavity along the explosion-proof hole 7; thereby sealing the cavity to form a closed space; specifically, electrode slice 4, explosion-proof post 5 all with lap 2 between be equipped with sealing insulation layer 6, make and hold the chamber and form inclosed accommodation space, when holding the intracavity air pressure increase, promote explosion-proof post 5 and break away from explosion-proof hole 7, or the temperature surge can soften sealing insulation layer 6 to a certain extent in the shell, the explosion-proof post 5 and the separation of electrode slice 4 and apron 2 of being convenient for, thereby realize explosion-proof function, need not additionally to set up parts such as explosion-proof valve, not only the structure has been simplified, and the cost is reduced.
Specifically, in order to fasten the explosion-proof column 5 and improve the sealing effect, the edge of the explosion-proof hole 7 integrally extends along the direction of the accommodating cavity to form a clamping sleeve 3, the explosion-proof column 5 is tightly matched in the clamping sleeve 3, and a sealing insulating layer 6 is arranged between the explosion-proof column and the inner wall of the clamping sleeve 3; the explosion-proof column 5 is tightly matched with the clamping sleeve 3 through the sealing insulating layer 6, and the buffer piece and the cover plate 2 can be tightly connected in an insulating mode through the sealing insulating layer 6. Specifically, the lengths of the clamping sleeve 3 and the explosion-proof column 5 are equal to or less than the height of the accommodating cavity, the length of the clamping sleeve 3 may be greater than or less than or equal to the length of the explosion-proof column 5, and in this embodiment, the length of the clamping sleeve 3 is equal to the length of the explosion-proof column 5. The explosion-proof hole 7 and the clamping sleeve 3 are coaxially arranged with the cover plate 2, namely, the explosion-proof hole 7 and the clamping sleeve 3 are positioned at the right center of the cover plate 2; the explosion-proof hole 7 is a round hole, so the clamping sleeve 3 is a hollow cylinder, the hollow cylinder is communicated with the explosion-proof hole 7, the aperture of the explosion-proof hole 7 or the inner diameter of the clamping sleeve 3 is 1-2mm, in other embodiments, the explosion-proof hole 7 can also be a polygonal hole, and the clamping sleeve 3 can also be a polygonal column.
In a specific embodiment, the electrode plate 4 is in a shape of a circular sheet, and the electrode plate 4 is adhered and adhered to the outer side of the cover plate 2; of course, the electrode plate 4 may also be a polygonal structure, and the explosion-proof column 5 is perpendicular to one side of the electrode plate 4 and is arranged coaxially with the electrode plate 4. Because the explosion-proof column 5 is matched with the clamping and fixing sleeve 3, the explosion-proof column 5 can also be a cylinder or a polygon prism, in the embodiment, the explosion-proof column 5 is a polygon prism, the diameter of the explosion-proof column 5 is 0.5-1.5mm, and in the embodiment, the diameter of the explosion-proof column 5 is 1.2 mm. Since the explosion-proof sealing structure in this embodiment is used for a button cell, the electrode tab 4 needs to be electrically connected to one of the electrical devices, and the case 1 or the cover plate 2 needs to be electrically connected to the other of the electrical devices, the larger the surface area of the electrode tab 4, the easier it is to connect to the electrical devices, thereby avoiding short-circuiting, and therefore, in this embodiment, the radius of the electrode tab 4 is greater than or equal to half of the radius of the cover plate 2. Meanwhile, in order to prevent short circuit, liquid leakage or poor contact of the button cell, the electrode plate 4 needs to be in sealed insulation connection with the cover plate 2 and the shell 1, a sealing insulation layer 6 is coated between the electrode plate 4 and the cover plate 2, and the electrode plate 4 is attached and bonded with the cover plate 2 through the sealing insulation layer 6; in this embodiment, the sealing insulating layer 6 may be an insulating glue or an insulating sheath, and the material of the sealing insulating layer 6 includes one or more of polypropylene, propylene-ethylene copolymer, polyetheretherketone, and polyvinylidene fluoride.
Specifically, in order to ensure that the cover plate 2 is connected with the shell 1 in a sealing manner, the edge of one end, away from the bottom surface, of the side wall of the shell 1 is welded with the edge of the cover plate 2 into a whole. Laser welding may be employed in this embodiment. Apron 2 can be the disc form, and the periphery of apron 2 is equipped with the step form recess with the upper end edge looks adaptation of casing 1 to 2 spacing on casing 1 are lapped in being convenient for, and weld the edge of apron 2, improve sealed effect, and improve the yields of product.
The button battery explosion-proof sealing structure comprises a shell 1 with a bottom surface and a side wall extending around the edge of the bottom surface, wherein the edge of the upper end of the shell 1 is connected with a cover plate 2 in a sealing manner, the cover plate 2 and the shell 1 form a hollow cavity, and an explosion-proof hole 7 is formed in the cover plate 2; an electrode plate 4 is arranged on the outer side of the cover plate 2, an explosion-proof column 5 matched with the explosion-proof hole 7 is integrally connected to one side of the electrode plate 4, and the explosion-proof column 5 extends into the accommodating cavity along the explosion-proof hole 7; the electrode plate 4 and the explosion-proof column 5 are both arranged with the sealing insulating layer 6 between the cover plate 2, and the electrode plate 4 is adhered to the cover plate 2 through the sealing insulating layer 6. This seal structure connects compactly, through explosion-proof post 5 sealed explosion-proof hole 7, when holding the chamber internal gas pressure increase, with the ejecting effect that reaches explosion-proof hole 7 pressure release of explosion-proof post 5, prevent the explosion of casing 1 inflation, moreover, the steam generator is simple in structure, low in manufacturing cost, be equipped with sealing insulation layer 6 between explosion-proof post 5 and the explosion-proof hole 7, the edge of explosion-proof hole 7 forms the solid cover of card 3 along holding the integrative extension of chamber direction, explosion-proof post 5 card is in the solid cover of card 3, and with be equipped with sealing insulation layer 6 between the inner wall of the solid cover of card 3, when having the explosion-proof function, sealing insulation performance is good.
Example 2: referring to fig. 1 and 2, the button cell of the present embodiment includes the explosion-proof sealing structure of the button cell described in embodiment 1; the explosion-proof battery further comprises an electrode assembly 8 and electrolyte, wherein the electrode assembly 8 and the electrolyte are located in the accommodating cavity, one side of the electrode assembly 8 is connected to the shell 1 or the cover plate 2 through a positive electrode conductor 10, the other side of the electrode assembly 8 is connected with the explosion-proof column 5 through a negative electrode conductor 11, an insulating pad 9 is arranged between the electrode assembly 8 and the bottom surface of the shell 1, the insulating pad 9 is in a disc shape, the surface area of the insulating pad 9 can be equal to or smaller than that of the bottom surface of the shell 1, and the insulating pad 9 is made of one or more of polypropylene, propylene-ethylene copolymer, polyether ether ketone and polyvinylidene fluoride. Specifically, the electrode assembly 8 may have a spiral or laminated structure; in the present embodiment, the electrode assembly 8 is in the form of a spiral winding, the clamping sleeve 3 passes through the axis of the electrode assembly 8, the inner diameter of the clamping sleeve 3 may be 1-2mm, and in the present embodiment, the inner diameter of the clamping sleeve 3 is 1.4 mm; the outer diameter of the clamping sleeve 3 can be less than 3mm, and in the embodiment, the outer diameter of the clamping sleeve 3 is 1.9 mm; the thickness of the sealing insulating layer 6 may be less than 0.5mm, and in this embodiment, the thickness of the sealing insulating layer 6 is 0.2 mm. The diameter size of a common button battery is within the range of 5.8-20mm, the diameter of the button battery in the embodiment is about 12mm, therefore, the clamping sleeve 3 is positioned in the accommodating cavity, the occupied space is small, compared with the existing button battery, the upper shell and the lower shell are sleeved together, the insulating ring is additionally arranged in the middle, the button battery of the embodiment is provided with only one layer of side wall, the cavity volume is enlarged, the clamping sleeve 3 penetrates through the center of the spiral electrode assembly 8, the occupied space is small, and the capacity of the battery is improved to a certain extent. Specifically, the positive electrode conductor 10 is an aluminum foil with a thickness of 0.006-0.018mm, the negative electrode conductor 11 is a copper foil with a thickness of 0.006-0.016mm, and the positive electrode conductor 10 and the negative electrode conductor 11 are in rectangular, strip or strip structures.
The specific button cell structure is shown in fig. 1: the shell 1 is of a cylindrical structure with an opening at the upper end, the cover plate 2 is in a disc shape, the cover plate 2 is welded on the edge of the upper end of the shell 1 through laser, the explosion-proof hole 7 is positioned in the center of the cover plate 2, the clamping and fixing sleeve 3 is a hollow cylindrical sleeve with the explosion-proof hole 7 extending along the axial direction, the explosion-proof column 5 is inserted in the clamping and fixing sleeve 3 and is in sealed and insulated connection with the explosion-proof hole 7, and the electrode plate 4 is adhered to the outer surface of the cover plate 2 and is in sealed and insulated connection with the outer surface of the cover plate 2; the clamping sleeve 3 is inserted in the center of the electrode assembly 8, the length of the clamping sleeve 3 is preferably greater than or equal to half of the height of the containing cavity, so that the explosion-proof hole can be fastened with an explosion-proof column or the explosion-proof column can further seal the explosion-proof hole, and the height of the containing cavity and the length of the explosion-proof column are both about 3.5mm in the embodiment; one side of the electrode assembly 8 is electrically connected with the cover plate 2 through an anode conductor 10 in a welding mode, the other side of the electrode assembly 8 is electrically connected with the explosion-proof column 5 through a cathode conductor 11, the cathode conductor 11 can be directly electrically connected with the explosion-proof column 5 in a welding mode, and can also be directly clamped between the sealing insulating layer 6 and the explosion-proof column 5, because the anode conductor 10 is arranged at the upper end of the electrode assembly 8, the cathode conductor 11 is arranged at the lower end of the electrode assembly 8, and in order to prevent the cathode conductor 11 from contacting with the inner wall of the bottom surface of the shell 1 to cause short circuit, an insulating pad 9 is arranged between the electrode assembly 8 and the bottom surface of the shell 1, and the insulating pad 9 is used for insulating the cathode conductor 11 and the bottom surface of the shell 1; when the button cell is used, the electrode plate 4 corresponds to the negative electrode of the button cell, the shell 1 or the cover plate 2 corresponds to the positive electrode of the button cell, and the positive electrode and the negative electrode are respectively connected with electric equipment to form a loop for supplying power. When the button battery is abnormally charged and discharged or the positive electrode and the negative electrode are in short circuit, the temperature in the shell can be sharply increased, the pressure in the shell can be increased and the shell can expand due to the gas generated by the electrolyte, and the explosion-proof column 5 and the electrode plate 4 are separated from the cover plate 2 due to the good sealing performance of the shell, so that the purpose of pressure relief is achieved. Certainly, the temperature surge in the shell can soften the sealing insulating layer 6 to a certain extent, so that the explosion-proof column 5 and the electrode plate 4 are separated from the cover plate 2, and the battery explosion is prevented from causing more damage to electric equipment and users.
Compared with the existing button battery, the button battery has the advantages that the structure is exquisite and compact, the upper shell and the lower shell are sleeved together, the insulating ring is added in the middle, the button battery only has one layer of side wall, the cavity volume is enlarged, and the battery capacity is improved; the upper cover and the shell 1 are sealed by laser welding, a sealing insulating layer 6 is arranged between the explosion-proof column 5 and the explosion-proof hole 7, meanwhile, the edge of the explosion-proof hole 7 integrally extends along the direction of the accommodating cavity to form a clamping sleeve 3, and the clamping sleeve 3 is clamped into the center of the electrode assembly 8, so that the sealing insulating area between the explosion-proof column 5 and the explosion-proof hole 7 is increased, the sealing performance is improved, and electrolyte is prevented from leaking and corroding electric equipment; meanwhile, the battery has an explosion-proof effect, when the air pressure in the accommodating cavity is increased and the shell 1 expands, the explosion-proof column 5 is extruded to be separated from the explosion-proof hole 7, so that the pressure is relieved, and serious accidents caused by expansion explosion or ignition of the button battery are avoided. The shell 1, the cover plate 2, the clamping sleeve 3, the electrode plate 4 and the explosion-proof column 5 of the button cell are all made of stainless steel, so that the corrosion resistance of the whole button cell is improved, and the service cycle is prolonged.
Example 3: a method for encapsulating a button cell, which is used for encapsulating the button cell described in example 2, comprising the following steps:
s1, coating the periphery and the inner wall of the explosion-proof hole 7 with a sealing insulating layer 6;
specifically, the periphery of the explosion-proof hole 7 on the cover plate 2 and the inner wall of the explosion-proof hole 7 are coated with the sealing insulating layer 6, the area of the sealing insulating layer 6 is not smaller than that of the electrode plate 4, and the electrode plate 4 is ensured to be in insulating connection with the cover plate 2. The edge of the explosion-proof hole 7 integrally extends along the direction of the cavity to form a hollow clamping sleeve 3, and the inner wall of the clamping sleeve 3 is coated with a sealing insulating layer 6.
S2, attaching and bonding the electrode plate 4 to the sealing insulating layer 6 on one side of the cover plate 2, inserting the explosion-proof column 5 along the explosion-proof hole 7, and enabling the explosion-proof column 5 and the explosion-proof hole 7 to be in interference fit through the sealing insulating layer 6;
specifically, the area of the sealing insulating layer 6 is not smaller than that of the electrode plate 4, the electrode plate 4 is attached and bonded to the sealing insulating layer 6 on one side of the cover plate 2, the electrode plate 4 is ensured to be in sealing insulating connection with the cover plate 2, and the risk of short circuit of the battery is prevented; be equipped with sealing insulation layer 6 between the inner wall of the solid cover of card 3 and the explosion-proof post 5, sealing insulation layer 6 can be for insulating cement or the insulating cover of cover locating on explosion-proof post 5, through sealing insulation layer 6 interference fit between the inner wall of explosion-proof post 5 and the solid cover 3 of card, guarantees that explosion-proof post 5 and the solid cover 3 of card are connected with sealing insulation, prevents the weeping risk.
S3, passing the explosion-proof column 5 through the center of the electrode assembly 8, spot-welding one side of the electrode assembly 8 to the case 1 or the cap plate 2 through the positive electrode conductor 10, and connecting the other side of the electrode assembly 8 to the explosion-proof column 5 through the negative electrode conductor 11;
specifically, one end of the explosion-proof column 5 is inserted into the clamping sleeve 3 along the explosion-proof hole 7 and is tightly matched with the clamping sleeve 3, and meanwhile, the clamping sleeve 3 and the explosion-proof column 5 positioned in the clamping sleeve 3 are synchronously inserted into the center of the electrode assembly 8, because the outer diameter of the clamping sleeve 3 can be smaller than 3mm, in this embodiment, 1.9mm, the occupied space is small; one side of the electrode assembly 8 is connected to the cover plate 2 through a positive electrode conductor 10 in a spot welding mode, and the other side of the electrode assembly 8 is connected with the explosion-proof column 5 through a negative electrode conductor 11 in a spot welding mode or is clamped between the explosion-proof column 5 and the sealing insulating layer 6 on the inner wall of the clamping and fixing sleeve 3. The electrode plate 4 is insulated from the cover plate 2, the cover plate 2 and the shell 1 correspond to the positive pole of the button cell, and the electrode plate 4 corresponds to the negative pole of the button cell.
S4, placing an insulating pad 9 at the bottom of the containing cavity, and placing the explosion-proof column 5 and the electrode assembly 8 in the containing cavity;
specifically, because the lower end of the electrode assembly 8 is connected with the explosion-proof column 5 through the negative conductor 11 in a spot welding manner, in order to avoid the short circuit of the battery caused by the contact between the negative conductor 11 and the bottom surface of the shell 1, the insulating pad 9 needs to be placed at the bottom of the accommodating cavity, and then the electrode assembly 8, the clamping sleeve 3 and the explosion-proof column 5 positioned inside the clamping sleeve 3 are placed in the accommodating cavity.
S5, injecting electrolyte into the cavity;
specifically, the electrolyte can be injected before the electrode assembly 8, the clamping sleeve 3 and the explosion-proof column 5 positioned in the clamping sleeve 3 are placed in the cavity.
And S6, welding the edge of one end of the side wall of the shell 1 far away from the bottom surface and the edge of the cover plate 2 into a whole by laser.
Specifically, apron 2 is platelike structure in this embodiment, and the edge that directly passes through laser welding with the lateral wall of casing 1 and apron 2 is as an organic whole, compares current button cell, and the epitheca cup joints together with the inferior valve, and the centre increases insulating circle, and this button cell only one deck lateral wall can enlarge the cavity volume, improves battery capacity.
The packaging method of the button cell is convenient and fast to operate, high in production efficiency, large in capacity of the produced button cell, good in sealing performance and stability and capable of achieving an explosion-proof function.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.

Claims (10)

1. An explosion-proof sealing structure of a button battery is characterized by comprising a shell with a bottom surface and a side wall extending around the edge of the bottom surface, wherein the edge of the upper end of the shell is connected with a cover plate in a sealing manner, the cover plate and the shell form a hollow cavity, and an explosion-proof hole is formed in the cover plate; an electrode plate is arranged on the outer side of the cover plate, an explosion-proof column matched with the explosion-proof hole is integrally connected to one side of the electrode plate, and the explosion-proof column extends into the accommodating cavity along the explosion-proof hole; and a sealing insulating layer is arranged between the electrode plate and the cover plate and between the explosion-proof column and the cover plate.
2. The explosion-proof seal structure for the button cell according to claim 1, wherein the edge of the explosion-proof hole integrally extends along the direction of the cavity to form a clamping sleeve; the explosion-proof column is tightly matched in the clamping sleeve, and a sealing insulating layer is arranged between the explosion-proof column and the inner wall of the clamping sleeve.
3. The explosion-proof seal structure of a button cell according to claim 2, wherein the explosion-proof hole and the clamping sleeve are coaxially arranged with the cover plate.
4. The explosion-proof sealing structure of a button cell according to claim 3, wherein the electrode plate is in a circular sheet shape, and the explosion-proof column is perpendicular to one side of the electrode plate and is coaxially arranged with the electrode plate.
5. The explosion-proof seal structure of a button cell according to claim 4, wherein the clamping sleeve is a hollow cylinder or a hollow polygonal column; the explosion-proof column is a cylinder or a polygonal column.
6. The explosion-proof seal structure for button cells according to claim 4, wherein the radius of the electrode tabs is greater than or equal to half of the radius of the cover plate.
7. The explosion-proof sealing structure for the button cell according to claim 1, wherein the edge of one end of the side wall of the shell far away from the bottom surface is welded with the edge of the cover plate into a whole.
8. The explosion-proof seal structure of button cell according to claim 1, characterized in that the material of the sealing insulating layer comprises one or more of polypropylene, propylene-ethylene copolymer, polyetheretherketone, polyvinylidene fluoride.
9. A button cell, which is characterized by comprising the explosion-proof sealing structure of the button cell according to any one of claims 1 to 8; the explosion-proof battery is characterized by further comprising an electrode assembly and electrolyte, wherein the electrode assembly and the electrolyte are located in the accommodating cavity, one side of the electrode assembly is connected to the shell or the cover plate through an anode conductor, the other side of the electrode assembly is connected with the explosion-proof column through a cathode conductor, and an insulating pad is arranged between the electrode assembly and the bottom surface of the shell.
10. A packaging method of a button cell is characterized by comprising the following steps:
s1, coating the periphery and the inner wall of the explosion-proof hole with a sealing insulating layer;
s2, attaching and bonding the electrode plate to the sealing insulating layer on one side of the cover plate, inserting the explosion-proof column along the explosion-proof hole, and performing interference fit between the explosion-proof column and the explosion-proof hole through the sealing insulating layer;
s3, the explosion-proof column penetrates through the center of the electrode assembly, one side of the electrode assembly is connected to the shell or the cover plate through the positive electrode conductor in a spot welding mode, and the other side of the electrode assembly is connected with the explosion-proof column through the negative electrode conductor;
s4, placing an insulating pad at the bottom of the containing cavity, and placing the explosion-proof column and the electrode assembly in the containing cavity;
s5, injecting electrolyte into the cavity;
and S6, welding the edge of one end of the side wall of the shell far away from the bottom surface and the edge of the cover plate into a whole by laser.
CN202110909979.4A 2021-08-09 2021-08-09 Button cell explosion-proof sealing structure, button cell and packaging method thereof Pending CN113488692A (en)

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CN115472974A (en) * 2022-09-14 2022-12-13 阜阳海钠科技有限责任公司 Battery sealing safety device, lithium sodium ion battery and secondary utilization method
WO2023070949A1 (en) * 2021-10-27 2023-05-04 广东维都利新能源有限公司 Integrated electrode structure capable of rapid curing and sealing, and manufacturing method therefor
CN116365154A (en) * 2023-06-02 2023-06-30 深圳海辰储能控制技术有限公司 Energy storage device and energy storage system
WO2024000874A1 (en) * 2022-06-29 2024-01-04 深圳市聚和源科技有限公司 Edge-free cylindrical battery structure and preparation method therefor

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023070949A1 (en) * 2021-10-27 2023-05-04 广东维都利新能源有限公司 Integrated electrode structure capable of rapid curing and sealing, and manufacturing method therefor
WO2024000874A1 (en) * 2022-06-29 2024-01-04 深圳市聚和源科技有限公司 Edge-free cylindrical battery structure and preparation method therefor
CN115472974A (en) * 2022-09-14 2022-12-13 阜阳海钠科技有限责任公司 Battery sealing safety device, lithium sodium ion battery and secondary utilization method
CN116365154A (en) * 2023-06-02 2023-06-30 深圳海辰储能控制技术有限公司 Energy storage device and energy storage system
CN116365154B (en) * 2023-06-02 2023-07-28 深圳海辰储能控制技术有限公司 Energy storage device and energy storage system

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