WO2022028331A1 - 扣式电池及其制备方法 - Google Patents

扣式电池及其制备方法 Download PDF

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Publication number
WO2022028331A1
WO2022028331A1 PCT/CN2021/109778 CN2021109778W WO2022028331A1 WO 2022028331 A1 WO2022028331 A1 WO 2022028331A1 CN 2021109778 W CN2021109778 W CN 2021109778W WO 2022028331 A1 WO2022028331 A1 WO 2022028331A1
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WO
WIPO (PCT)
Prior art keywords
tab
top cover
bottom wall
welding
winding core
Prior art date
Application number
PCT/CN2021/109778
Other languages
English (en)
French (fr)
Inventor
彭宁
Original Assignee
珠海冠宇电池股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 珠海冠宇电池股份有限公司 filed Critical 珠海冠宇电池股份有限公司
Priority to EP21852895.8A priority Critical patent/EP4047723A1/en
Publication of WO2022028331A1 publication Critical patent/WO2022028331A1/zh
Priority to US17/746,980 priority patent/US20220278351A1/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
    • H01M10/04—Construction or manufacture in general
    • H01M10/0422—Cells or battery with cylindrical casing
    • H01M10/0427—Button cells
    • 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
    • H01M10/04—Construction or manufacture in general
    • H01M10/0431—Cells with wound or folded electrodes
    • 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
    • H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
    • 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
    • H01M50/183—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
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/536—Electrode connections inside a battery casing characterised by the method of fixing the leads to the electrodes, e.g. by welding
    • 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
    • H01M50/543—Terminals
    • H01M50/545—Terminals formed by the casing of the 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
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H01M50/564—Terminals characterised by their manufacturing process
    • H01M50/566—Terminals characterised by their manufacturing process by welding, soldering or brazing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2220/00—Batteries for particular applications
    • H01M2220/30—Batteries in portable systems, e.g. mobile phone, laptop
    • 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

Definitions

  • the invention relates to the technical field of lithium batteries, in particular to a button battery and a preparation method thereof.
  • Button battery refers to a battery with a size like a button, generally speaking, the diameter is larger and the thickness is thinner.
  • Button batteries are divided into two categories: chemical batteries and physical batteries. Among them, chemical batteries are the most widely used, mainly composed of anode, cathode and electrolyte.
  • button batteries Because of its small size, button batteries have been widely used in various small and micro electronic products, such as: computer motherboards, headphones, electronic watches, electronic dictionaries, electronic scales, remote controls, electric toys, pacemakers , electronic hearing aids, counters, cameras, etc. In order to ensure the quality and performance of products equipped with button batteries, the quality and performance of button batteries have also received more and more attention.
  • the shell is easily deformed, which affects the quality and performance of the button battery; The effect of the electrical connection between the battery and the electronic product.
  • the invention provides a button-type battery and a preparation method thereof.
  • the shell is not easily deformed, thereby helping to ensure the quality and performance of the button-type battery; No welding bump is formed, which is beneficial to ensure the electrical connection effect between the button battery and the electronic product.
  • the present invention provides a button-type battery, comprising an outer casing and a winding core;
  • the outer casing includes a casing and a top cover assembly, wherein the casing includes: a bottom wall and a bottom wall along the outer edge of the bottom wall. a side wall extending upward, the top cover assembly is covered on the top end of the side wall and sealed with the side wall, the casing and the top cover assembly are jointly enclosed for accommodating the accommodating cavity of the winding core;
  • the winding core includes a positive electrode sheet and a negative electrode sheet, a cavity is formed in the center of the winding core, and the positive electrode sheet or the negative electrode sheet is provided with a first tab extending toward the bottom wall, the first polar
  • the ears are welded to the bottom wall of the casing by laser welding;
  • the welding area of the first tab has a welding mark, and the welding mark is located in the overlapping portion of the bottom wall and the cavity, and the outer surface of the welding area of the bottom wall is a smooth surface.
  • the button battery of the present invention includes a casing and a winding core, the casing includes a casing and a top cover assembly, the casing and the top cover assembly together form an accommodating cavity for accommodating the winding core, and the winding core can output electrical energy outward through the casing Or receive the electrical energy input from the outside through the shell.
  • the winding core includes a first tab, and the first tab is welded to the bottom wall of the casing by laser welding.
  • the tabs are in direct contact, and the purpose of welding the first tabs and the bottom wall of the housing only needs to be irradiated on the first tabs by the laser light emitted by the laser welding equipment, so as to avoid contact pressure welding.
  • the deformation of the casing is not only conducive to ensuring the quality and performance of the button battery, but also conducive to improving the yield of the button battery.
  • the smooth surface of the shell of the button battery can keep a good contact with the conductive area of the electronic product, which is conducive to ensuring the electrical connection effect between the button battery and the electronic product, and thus helps to improve the relationship between the button battery and the electronic product. energy transfer efficiency between.
  • the distance from the top end of the side wall to the solder print is greater than the length from the end of the first tab out of the winding core to the tab of the solder print.
  • the solder print includes a spot solder print.
  • the edge of the spot welding is rounded.
  • the diameter of the spot solder print is not less than 50 ⁇ m.
  • the number of the spot welding marks is not less than 2.
  • the top cover assembly includes an upper cover and a top cover, the upper cover extends from the top end of the side wall to the direction of the central axis of the casing, and the upper cover is provided with a top cover.
  • the top cover is arranged in the central hole and sealed with the upper cover.
  • the present invention provides a method for preparing a button battery, comprising:
  • a housing comprising a housing and a top cover assembly, the housing comprising a bottom wall and a side enclosure wall disposed along an outer edge of the bottom wall and extending upward;
  • a winding core is provided, the winding core includes a positive electrode sheet and a negative electrode sheet, a cavity is formed in the center of the winding core, and the positive electrode sheet or the negative electrode sheet is provided with a first tab;
  • the top cover assembly is covered on the top end of the side wall and sealed with the side wall.
  • the preparation method of the button battery of the present invention uses laser welding equipment to weld the first tab to the bottom wall of the casing.
  • laser welding does not require laser welding equipment to The first tab is in direct contact, and the purpose of welding the first tab and the bottom wall of the housing only needs to be irradiated on the first tab by the laser emitted by the laser welding equipment, so that contact pressure welding can be avoided.
  • the resulting deformation of the casing is not only conducive to ensuring the quality and performance of the button battery, but also conducive to improving the yield of the button battery.
  • the smooth surface of the shell of the button battery can keep a good contact with the conductive area of the electronic product, which is conducive to ensuring the electrical connection effect between the button battery and the electronic product, and thus helps to improve the relationship between the button battery and the electronic product. energy transfer efficiency between.
  • the preparation method of the button battery as described above, optionally, the use of laser welding equipment to weld the first tab to the bottom wall includes:
  • the height of the hollow tube is greater than the height of the winding core.
  • the height of the hollow tube is greater than 5 mm.
  • the outer diameter of the hollow tube is between 1 mm and 3 mm; and/or, the inner diameter of the hollow tube is between 0.5 mm and 2.8 mm; and/or Or, the wall thickness of the hollow tube is between 0.05mm and 0.5mm.
  • the hollow tube is a metal hollow tube.
  • the laser welding device welds the first tab to the bottom wall of the casing by means of pulsed spotting.
  • the welding of the second tab of the winding core to the inner side of the top cover assembly includes:
  • the diode lugs are welded to the part of the top cover located inside the insulating rubber ring.
  • the second tab is welded to the top cover by means of laser pulse dots.
  • the top cover assembly includes an upper cover and a top cover, and the center of the upper cover has a center hole;
  • the step of covering the top cover assembly on the top end of the side wall and sealing with the side wall includes:
  • the top cover is set on the central hole of the upper cover and is insulated and sealed with the upper cover;
  • the upper cover is placed on the top of the side wall and welded with the side wall
  • the present invention provides an electronic product, including the button battery according to any one of the above.
  • the electronic product of the present invention includes a button-type battery
  • the button-type battery includes a casing and a winding core
  • the casing includes a casing and a top cover assembly
  • the casing and the top cover assembly together form an accommodating cavity for accommodating the winding core
  • the winding core It is possible to output electric energy through the casing or receive electric energy input from the outside through the casing.
  • the winding core includes a first tab, and the first tab is welded to the bottom wall of the casing by laser welding.
  • the tabs are in direct contact, and the purpose of welding the first tabs and the bottom wall of the housing only needs to be irradiated on the first tabs by the laser light emitted by the laser welding equipment, so as to avoid contact pressure welding.
  • the deformation of the casing is not only conducive to ensuring the quality and performance of the button battery, but also conducive to improving the yield of the button battery.
  • the smooth surface of the shell of the button battery can keep a good contact with the conductive area of the electronic product, which is beneficial to ensure the electrical connection effect between the button battery and the electronic product, which is beneficial to improve the connection between the button battery and the electronic product. energy transfer efficiency between.
  • FIG. 1 is a cross-sectional view of a button-type battery provided in Embodiment 1 of the present invention.
  • FIG. 2 is a top view of the button battery according to Embodiment 1 of the present invention after removing the top cover;
  • FIG. 3 is a schematic diagram of the process of loading the winding core into the casing according to the second embodiment of the present invention.
  • FIG. 4 is a schematic diagram of the process of extending the hollow tube into the winding core cavity according to the second embodiment of the present invention.
  • FIG. 5 is a cross-sectional view of the hollow tube provided in the second embodiment of the present invention located in the cavity of the winding core;
  • FIG. 6 is a schematic structural diagram of a cutting second tab according to Embodiment 2 of the present invention.
  • FIG. 7 is a schematic diagram of a process of gluing a top cover according to Embodiment 2 of the present invention.
  • FIG. 8 is a schematic structural diagram of the second tab and the top cover after welding according to the second embodiment of the present invention.
  • FIG. 9 is a schematic structural diagram of the top cover and the shell after being welded together according to the second embodiment of the present invention.
  • Button cell also known as button battery, refers to a battery with a size like a small button. Compared with cylindrical batteries, button batteries have larger diameters and thinner thicknesses. Due to the small size of the button battery, it has been widely used in various miniature electronic products, such as computer motherboards, electronic watches, electronic dictionaries, electronic scales, remote controls, electric toys, pacemakers, electronic hearing aids , counters, cameras, etc.
  • the button battery is mainly composed of a casing and a winding core located in the casing.
  • the casing includes a casing and a top cover assembly, wherein the casing includes a bottom wall and a side wall surrounding the outer edge of the bottom wall and extending upward, and the top cover assembly is covered on the top of the side wall and sealed with the side wall, thereby A accommodating cavity for accommodating the winding core is defined between the top cover assembly and the casing.
  • the top cover assembly includes an upper cover provided with a central hole, and a top cover provided at the central hole.
  • the central hole of the central axis, the top cover is arranged on the central hole, and the top cover and the upper cover are sealed.
  • the top cover and the upper cover are welded together to have the same electrical polarity, and the upper cover is then insulated and sealed with the side wall through an insulating seal; in other implementations, the upper cover and the side wall are welded together Together, the top cover and the top cover are insulated and sealed by an insulating seal, so that the top cover and the top cover have opposite electrical polarities.
  • the winding core is mainly formed by winding the stacked positive electrode sheet, the first separator, the negative electrode sheet and the second separator, and a cavity at least partially overlapping with the central hole is formed in the center of the winding core.
  • Electrolyte is also filled in the accommodating cavity, and the positive electrode sheet is provided with a positive electrode tab, and the negative electrode sheet is designed with a negative electrode tab.
  • One of the two tabs is welded to the bottom wall of the casing, and the other is welded to the top cover. .
  • the first operation method is: firstly welding the tabs and the casing, then welding The winding core is put into the casing;
  • the second operation method is: firstly, the winding core is put into the casing, and then the tabs and the casing are welded.
  • the welding needle of the resistance welding is passed through the cavity of the winding core and contacted with the tab to perform pressure welding.
  • this welding method is easy to cause deformation of the casing, which affects both the quality and performance of the button battery and the yield of the button battery.
  • Welding bumps will be formed on the surface, which will affect the electrical connection effect and energy transfer efficiency between the button battery and electronic products;
  • the welding needles of this welding method wear out relatively quickly, and the welding needles need to be replaced frequently and the welding equipment should be cleaned. Debugging not only affects production efficiency, but also increases the cost of solder pins.
  • the present invention provides a button battery, the core of the button battery includes a first tab, and the first tab is welded to the bottom wall of the casing by laser welding.
  • the laser The welding does not need to directly contact the laser welding equipment with the first tab, which avoids the deformation of the shell caused by contact pressure welding, which not only helps to ensure the quality and performance of the button battery, but also helps to improve the yield of the button battery;
  • the laser welding after the laser welding is completed, only a welding mark is formed on the welding area of the first tab, while the outer surface of the welding area of the bottom wall of the casing is a smooth surface, which is beneficial to ensure the connection between the button battery and the electronic product. Electrical connection effect and energy transfer efficiency;
  • laser welding does not require replacement of welding pins, which not only helps to improve production efficiency, but also helps to reduce production costs.
  • FIG. 1 is a cross-sectional view of the button battery according to the first embodiment of the present invention
  • FIG. 2 is a top view of the button battery according to the first embodiment of the present invention after removing the top cover.
  • the present embodiment provides a button battery
  • the button battery includes a casing 10 and a winding core 20.
  • the casing 10 includes a top cover assembly 110 and a casing 120.
  • the casing 120 and The top cover assemblies 110 together form an accommodating cavity for accommodating the core 20 .
  • the top cover assembly 110 includes an upper cover 111 and a top cover 112.
  • the upper cover 111 extends from the top of the side wall to the central axis of the casing 120, and a center surrounding the central axis of the casing 120 is provided in the center of the upper cover 111.
  • the top cover 112 covers the central hole and seals with the top cover 111 .
  • the outer edge of the upper cover 111 can be connected to the housing 120 by welding, the inner edge of the upper cover 111 and the outer edge of the top cover 112 are overlapped together, and the inner edge of the upper cover 111 and the outer edge of the top cover 112 are connected An insulating rubber ring 113 is sandwiched therebetween.
  • a seam where the upper cover 111 and the top cover 1112 are overlapped may be coated with sealant, so as to further ensure the tightness of the top cover assembly 110 .
  • the casing 120 includes: a bottom wall 121 and a side surrounding wall arranged along the outer edge of the bottom wall 121 and extending upward.
  • the bottom wall 121 of the housing 120 may protrude downward to form a convex surface.
  • the convex surface may be a conical surface, a spherical surface, or any other convex surface.
  • the arrangement of the convex surface can increase the internal space of the coin-type battery, thereby helping to improve the cycle performance of the coin-type battery.
  • the housing 10 includes two parts that are insulated and connected by the insulating rubber ring 113 , one part is the casing 120 and the upper cover 111 , and the other part is the top cover 112 .
  • the housing 120 may also be a part, and the upper cover 111 and the top cover 112 may be another part.
  • the winding core 20 includes a positive electrode sheet, a negative electrode sheet, and a separator separating the positive electrode sheet and the negative electrode sheet; the positive electrode sheet is provided with a positive electrode tab, and the negative electrode sheet is provided with a negative electrode tab; during the winding process, the positive electrode sheet, The separator and the negative electrode sheet are wound in the same direction from the winding head end to finally form a wound cell, and a cavity 230 is formed in the middle of the wound cell.
  • the winding core 20 of this embodiment includes a first tab 210 and a second tab 220, wherein the first tab 210 is a positive tab, and the second tab 220 is a negative tab; or, the first tab The tab 210 is a negative tab, and the second tab 220 is a positive tab.
  • first tab 210 and the second tab 220 are respectively connected and conducted with two mutually insulated parts of the casing, so that the winding core can output electrical energy through the casing, or receive externally input electrical energy through the casing.
  • first tab 210 is electrically connected to the housing 120
  • second tab 220 is electrically connected to the top cover 112 of the housing 120 having opposite polarity.
  • the second tab 220 when the electrical polarities of the upper cover 111 and the top cover 112 are opposite, the second tab 220 can be welded to the top cover 112 in the top cover assembly 110; when the electrical polarities of the upper cover 111 and the top cover 112 are the same , the second tab 220 can be welded with either the top cover 112 or the upper cover 111 .
  • the second tab 220 can also be connected to the top cover 112 or the upper cover 111 by other means, as long as the electrical conductivity after the connection can be ensured.
  • the first tab 210 is welded to the bottom wall 121 of the casing 120 by means of laser welding, and the welding area of the first tab 210 has a welding mark 211 , and the welding mark 211 is located between the bottom wall 121 and the cavity of the winding core 20 .
  • the outer surface of the welding area of the bottom wall 121 of the casing is a smooth surface.
  • the fact that the outer surface of the welding area of the bottom wall of the casing is a smooth surface means that after the laser welds the first tab 210 and the bottom wall 121 of the casing together, the welding mark 211 is only formed on the first tab
  • the side of 210 facing away from the bottom wall 121 of the casing, that is, the solder mark 211 can only be observed from the inside of the casing 120, and the solder mark does not extend to the side of the bottom wall of the casing that faces away from the first tab, that is, the outer side of the bottom wall of the casing.
  • the outer surface of the welding area of the bottom wall of the shell still maintains the shape of the outer surface of the bottom wall of the shell before welding, that is, the state of the smooth surface.
  • the winding core 20 is put into the casing 120, the first tabs 210 are attached to the bottom wall 121 of the casing, and the laser light emitted by the laser welding equipment passes through the cavity 230 of the winding core 20, so that the The first tab 210 is welded to the bottom wall 121 of the casing 120 , so that the welding area of the first tab 210 has a welding mark 211 , and the outer surface of the welding area of the casing bottom wall 121 is a smooth surface.
  • the distance L1 from the top end of the side wall of the casing 120 to the solder print 211 is greater than the length L2 from the end of the first tab 210 exiting the winding core 20 to the tab of the solder print 211 .
  • the top end of the side wall is indicated by G
  • the end point of the first tab 210 exiting the winding core 20 is indicated by K
  • the solder mark 211 is indicated by O.
  • FIG. 1 shows that the first tab 210 is disposed on the outer side of the winding core 20 , so that the end point K of the first tab 210 exiting the winding core 20 is correspondingly located on the outer side of the winding core 20 .
  • the button battery of this embodiment includes a casing 10 and a winding core 20 .
  • the casing 10 includes a casing 120 and a top cover assembly.
  • the casing 120 and the top cover assembly together form an accommodating cavity for accommodating the winding core 20 .
  • the housing 20 can output electrical energy to the outside through the housing 10 or receive electrical energy input from the outside through the housing 10 .
  • the winding core 20 includes a first tab 210, and the first tab 210 is welded to the bottom wall 121 of the housing 120 by laser welding.
  • the welding device is in direct contact with the first tab, and the purpose of welding the first tab and the bottom wall of the casing can be achieved by only irradiating the laser emitted by the laser welding device on the first tab, so that contact can be avoided.
  • the deformation of the casing caused by the pressure welding is not only conducive to ensuring the quality and performance of the button battery, but also conducive to improving the yield of the button battery.
  • the smooth surface of the shell of the button battery can keep a good contact with the conductive area of the electronic product, which is beneficial to ensure the electrical connection effect between the button battery and the electronic product, which is beneficial to improve the button battery. Energy transfer efficiency between batteries and electronics.
  • the welding marks 211 formed on the welding area of the first tab 210 after the laser welding is completed may include spot welding marks.
  • the laser welding equipment may emit laser light by means of pulsed spotting to weld the first tab 210 on the bottom wall 121 of the housing, and the welding mark 211 formed by the pulsed spotting method is a spot welding mark.
  • the edge of the spot welding in this embodiment may be round.
  • the diameter of the circular spot welds is not less than 50 ⁇ m.
  • the diameters of the circular spot welds can be 50 ⁇ m, 60 ⁇ m, 70 ⁇ m, 80 ⁇ m or 100 ⁇ m, etc.;
  • the diameter of the spot soldering marks is any value not less than 50 ⁇ m.
  • the number of spot welding marks in this embodiment is not less than 2.
  • the number of spot welding marks may be 2, 3, 4, 5, 6, or 8; It is actually necessary to set the number of spot solder prints to any value not less than 2.
  • the welding marks 211 formed in the welding area of the first tab 210 after the laser welding is completed may include linear welding marks.
  • the laser light emitted by the laser welding device may move along a linear path on the first tab 210 to weld the first tab 210 on the bottom wall 121 of the housing 120 , and the laser is on the first tab 210 .
  • the solder mark formed by the sexual movement welding is the linear solder mark.
  • the linear solder print may be a straight line, a broken line, a curved line or a spiral line, and the like.
  • FIG. 3 is a schematic diagram of the process of loading the winding core into the casing according to the second embodiment of the present invention
  • FIG. 4 is a schematic diagram of the process of inserting the hollow tube into the winding core cavity according to the second embodiment of the present invention
  • FIG. 5 is the second embodiment of the present invention.
  • a cross-sectional view of the provided hollow tube located in the cavity of the winding core
  • FIG. 6 is a schematic structural diagram of cutting the second tab according to the second embodiment of the present invention
  • FIG. 9 is a structural schematic diagram of the top cover and the shell provided by the second embodiment of the present invention after being welded together.
  • this embodiment provides a method for preparing a button battery, and the method for preparing the button battery includes:
  • the housing 10 includes a casing 120 and a top cover assembly 110 , wherein the casing 120 includes a bottom wall 121 and a side wall disposed along the outer edge of the bottom wall 121 and extending upward, and the top cover assembly 110 includes The upper cover 111 and the top cover 112, the upper cover 111 is from the top of the side wall to the direction of the central axis of the casing and the center of the upper cover 111 is provided with a central hole surrounding the central axis, and the top cover 112 is covered on the upper cover 111. the center hole and sealed with the upper cover 111.
  • the winding core 20 includes a positive electrode sheet and a negative electrode sheet, a cavity 230 at least partially overlapping with the central hole of the upper cover 111 is formed in the center of the winding core, and the positive electrode sheet or the negative electrode sheet is provided with a first tab 210.
  • the outer diameter of the winding core 20 can be 0.2 mm to 0.4 mm smaller than the inner diameter of the casing.
  • the internal pressure of the button battery is too large, which is beneficial to improve the safety performance of the button battery.
  • S400 Use a laser welding device to weld the first tab 210 to the bottom wall 121 .
  • the laser of the laser welding device passes through the cavity 230 of the winding core 20 .
  • the laser welding equipment may weld the first tabs 210 to the bottom wall 121 of the housing by means of pulsed spotting, so as to form spot welding marks 211 in the welding area of the first tabs 210; or, the laser welding equipment
  • the first tab can also be welded to the bottom wall of the casing by continuous welding, so as to form a line-shaped welding mark or a welding mark of other shapes in the welding area of the first tab.
  • the distance L1 from the top end of the side wall of the casing 120 to the solder print 211 is greater than the length L2 from the end of the first tab 210 exiting the winding core 20 to the tab of the solder print 211 .
  • the top end of the side wall is indicated by G
  • the end point of the first tab 210 exiting the winding core 20 is indicated by K
  • the solder mark 211 is indicated by O.
  • FIG. 1 shows that the first tab 210 is disposed on the outer side of the winding core 20 , so that the end point K of the first tab 210 exiting the winding core 20 is correspondingly located on the outer side of the winding core 20 .
  • S500 Weld the second tab 220 of the winding core 20 to the inner side of the top cover assembly 110 , as shown in FIG. 8 .
  • the second tab 220 is welded to the inner side of the welding of the top cover 112; when the electrical polarities of the upper cover 111 and the top cover 112 are the same, the second tab 220 is welded on the inner side of either the top cover 112 or the upper cover 111 .
  • S600 cover the top cover assembly 110 on the top end of the side wall of the casing 120 and seal with the side wall to form a button battery, as shown in FIG. 9 .
  • the upper cover 111 and the side wall are welded; when the electrical polarities of the upper cover 111 and the top cover 112 are the same, the upper cover 111 and the side wall pass through the sealant Ring insulation seal connection.
  • the manufacturing method of the button battery of this embodiment uses laser welding equipment to weld the first tab 210 to the bottom wall 121 of the casing 120.
  • laser welding does not The laser welding device is in direct contact with the first tab, and the purpose of welding the first tab and the bottom wall of the casing can be achieved by only irradiating the laser emitted by the laser welding device on the first tab, thereby avoiding The deformation of the casing caused by the contact pressure welding is beneficial not only to ensure the quality and performance of the button battery, but also to improve the yield of the button battery.
  • the smooth surface of the shell of the button battery can keep a good contact with the conductive area of the electronic product, which is beneficial to ensure the electrical connection effect between the button battery and the electronic product, which is beneficial to improve the connection between the button battery and the electronic product. energy transfer efficiency between.
  • S400 using laser welding equipment to weld the first tab 210 to the bottom wall 121, including:
  • the hollow tube 30 of this embodiment on the one hand, can be used to press the first tab 210 against the bottom wall 121 of the casing 120 to prevent the first tab 210 from being fitted with the bottom wall 121 of the casing It is not close enough to cause virtual welding, thereby affecting the quality and performance of the button battery; on the other hand, the laser can be separated from the winding core 20, and the laser can be guided, so as to not only prevent the laser from accidentally hurting the winding core 20, but also can Avoid irradiating the laser to other locations outside the welding area.
  • the height of the hollow tube 30 is greater than the height of the winding core 20 to ensure that the hollow tube 30 separates the winding core 20 from the laser and avoids accidental damage to the winding core 20 by the laser, which is not only beneficial to ensure the quality and performance of the button battery, but also It is beneficial to improve the yield of button batteries.
  • the height of the hollow tube 30 is greater than 5mm.
  • the height of the hollow tube 30 may be 5mm, 6mm, 7mm, 8mm, 9mm or 10mm, etc.; Any value of 5mm.
  • the outer diameter of the hollow tube 30 is between 1 mm and 3 mm.
  • the outer diameter of the hollow tube 30 may be 1 mm, 1.5 mm, 2 mm, 2.5 mm or 3 mm, etc.; or, the hollow tube 30
  • the outer diameter can also be set to any value between 1mm and 3mm according to actual needs.
  • the outer diameter of the hollow tube 30 can also be set to any value smaller than 1 mm or larger than 3 mm according to actual needs.
  • the inner diameter of the hollow tube 30 is between 0.5mm and 2.8mm.
  • the inner diameter of the hollow tube 30 may be 0.5mm, 1mm, 1.5mm, 2mm or 2.8mm, etc.; or, the hollow tube
  • the inner diameter of 30 can also be set to any value between 0.5mm and 2.8mm according to actual needs.
  • the inner diameter of the hollow tube 30 can also be set to any value smaller than 0.5 mm or larger than 2.8 mm according to actual needs.
  • the wall thickness of the hollow tube 30 is between 0.05mm and 0.5mm.
  • the wall thickness of the hollow tube 30 may be 0.05mm, 0.15mm, 0.3mm, 0.4mm, or 0.5mm, etc.;
  • the wall thickness of the hollow tube 30 can also be set to any value between 0.05mm and 0.5mm according to actual needs.
  • the wall thickness of the hollow tube 30 can also be set to any value smaller than 0.05 mm or larger than 0.5 mm according to actual needs.
  • the hollow tube 30 may be a metal hollow tube.
  • the hollow tube may be a stainless steel hollow tube, a copper hollow tube, an iron hollow tube, an aluminum hollow tube, or the like.
  • the hollow tube 30 may also be made of other high temperature resistant non-metallic materials, such as a ceramic hollow tube and the like.
  • S500 welding the second tab 220 of the winding core to the inner side of the top cover assembly, including:
  • the preset length of the second tab 220 is a length that can ensure that the second tab 220 is welded to the top cover assembly without blocking the liquid injection hole 1121 , that is, in the process of cutting the second tab 220 It is necessary to control the length of the second tab 220 to avoid that the length of the second tab 220 is too long to cover the injection hole 1121, or the length of the second tab 220 is too short, which will affect the second tab 220 and the top cover assembly. welding effect.
  • S502 Attach an insulating rubber ring 113 on the side of the top cover assembly 110 facing the winding core 20, and the insulating rubber ring 113 is coaxially arranged with the top cover assembly, as shown in FIG. 7 .
  • the insulating rubber ring 113 is used to insulate the winding core 20 and the top cover assembly 110 to ensure the performance of the button battery and avoid short circuit inside the button battery; the coaxial arrangement of the insulating rubber ring 113 and the top cover assembly is beneficial to ensure the insulation
  • the ring 113 is located between the top surface of the winding core 20 and the top cover assembly 110 to prevent the insulating rubber ring 113 from deviating and causing a short circuit.
  • S503 Weld the second tab 220 on the inner side of the top cover assembly 110 , as shown in FIG. 8 .
  • laser welding can be used to weld the second tab on the inner side of the top cover assembly 110 , so as to avoid deformation of the top cover on the one hand, and avoid the possibility of placing the second tab on the outside of the top cover assembly 110 on the one hand.
  • Soldering marks are formed on the surface; in another implementation manner, the second tab can also be welded to the inner side of the top cover assembly 110 by welding methods such as resistance welding, which will not be repeated here.
  • the second tab can be welded to the inner side of the top cover assembly 110 by laser pulse spotting, or the second tab can also be welded to the inner side of the top cover assembly 110 by laser continuous welding.
  • S600 cover the top cover assembly 110 on the top end of the side wall of the casing 120 and seal with the side wall of the casing 120 to form a button battery, including:
  • S601 Covering the top cover 112 on the central hole of the top cover 111 and insulating and sealing the top cover 111 . Specifically, the side of the top cover 112 welded with the second tabs 220 is downwardly closed at the center hole of the top cover 111 .
  • S602 Cover the upper cover 111 on the top end of the side wall of the housing 120 and weld it with the side wall.
  • the welding method between the upper cover 111 and the side wall of the casing 120 may be resistance welding, laser welding, or other welding methods.
  • the upper cover 111 and the side wall of the casing 120 may be welded together by means of side welding or pulse welding with rounded corners.
  • a sealing test can be carried out on the welding place to ensure the sealing of the button battery, thereby helping to ensure the quality and performance of the button battery.
  • This embodiment provides an electronic product including a button battery.
  • the button-type battery in this embodiment has the same structure as the button-type battery provided in the first embodiment, and can bring the same or similar technical effects.
  • the terms “installed”, “connected” and “connected” should be understood in a broad sense, unless otherwise expressly specified and limited, for example, it may be a fixed connection or a detachable connection Connection, or integral connection; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be internal communication between two elements.
  • installed should be understood in a broad sense, unless otherwise expressly specified and limited, for example, it may be a fixed connection or a detachable connection Connection, or integral connection; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be internal communication between two elements.

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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)
  • Connection Of Batteries Or Terminals (AREA)
  • Sealing Battery Cases Or Jackets (AREA)

Abstract

本发明提供一种扣式电池及其制备方法，扣式电池包括外壳和卷芯；外壳包括壳体和顶盖组件，壳体和顶盖组件共同围合成用于容置卷芯的容置腔；卷芯包括第一极耳，第一极耳通过激光焊接的方式焊接于壳体的底壁；第一极耳的焊接区域具有焊印，焊印位于壳体的底壁与卷芯的空腔相重叠的部分内，底壁的焊接区域的外表面为光滑面。本发明的扣式电池不仅有利于保证扣式电池的质量和性能，而且有利于保证扣式电池与电子产品之间的电连接效果。

Description

扣式电池及其制备方法
本申请要求于2020年08月04日提交中国专利局、申请号为202010771287.3、申请名称为“扣式电池及其制备方法”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本发明涉及锂电池技术领域，尤其涉及一种扣式电池及其制备方法。
背景技术
扣式电池，指外形尺寸像一颗纽扣的电池，一般来说直径较大，厚度较薄。扣式电池分为化学电池和物理电池两类，其中，化学电池应用最为普遍，主要由阳极、阴极及其电解液组成。
扣式电池因其体积小，故在各种小型和微型电子产品中得到了广泛的应用，例如：电脑主板、耳机、电子表、电子词典、电子秤、遥控器、电动玩具、心脏起搏器、电子助听器、计数器以及照相机等，为了确保装配有扣式电池的产品的质量和性能，扣式电池的质量和性能也受到了越来越多的关注。
然而，现有的扣式电池在加工制造的过程中，一方面，壳体容易发生形变，影响扣式电池的质量和性能；另一方面，壳体的外表面会形成焊接凸起，影响扣式电池与电子产品之间的电连接效果。
发明内容
本发明提供一种扣式电池及其制备方法，本发明的扣式电池在加工制造的过程中，外壳不易发生形变，从而有利于保证扣式电池的质量和性能；同时，壳体的外表面不会形成焊接凸起，从而有利于保证扣式电池与电子产品之间的电连接效果。
第一方面，本发明提供一种扣式电池，包括外壳和卷芯；所述外壳包括壳体和顶盖组件，其中，所述壳体包括：底壁以及沿所述底壁的外边缘设置并往上延伸的侧围壁，所述顶盖组件盖设在所述侧围壁的顶端并与所述侧围 壁密封，所述壳体和所述顶盖组件共同围合成用于容置所述卷芯的容置腔；
所述卷芯包括正极片和负极片，所述卷芯的中心形成有空腔，并且所述正极片或负极片设置有往所述底壁方向延伸的第一极耳，所述第一极耳通过激光焊接的方式焊接于所述壳体的底壁；
所述第一极耳的焊接区域具有焊印，所述焊印位于所述底壁与所述空腔相重叠的部分内，所述底壁的焊接区域的外表面为光滑面。
本发明的扣式电池包括外壳和卷芯，外壳包括壳体和顶盖组件，壳体和顶盖组件共同围合成用于容置卷芯的容置腔，卷芯能够通过外壳向外输出电能或者通过外壳接收外界输入的电能。卷芯包括第一极耳，第一极耳通过激光焊接的方式焊接于壳体的底壁，一方面，相比于电阻焊接触加压的焊接方式，激光焊无需将激光焊接设备与第一极耳直接接触，而仅需将激光焊接设备发出的激光照射在第一极耳上即可实现将第一极耳与壳体的底壁进行焊接的目的，从而能够避免接触加压焊接导致的壳体形变，进而不仅有利于保证扣式电池的质量和性能，而且有利于提升扣式电池的成品率。
另一方面，激光焊接完成后仅会在第一极耳的焊接区域形成焊印，而壳体底壁的焊接区域的外表面则为光滑面，即，在将扣式电池装配入电子产品后，扣式电池的壳体的光滑面能够与电子产品的导电区域保持良好的接触，从而有利于保证扣式电池与电子产品之间的电连接效果，进而有利于提升扣式电池与电子产品之间的能量传递效率。
如上所述的扣式电池，可选的，所述侧围壁的顶端到所述焊印的距离大于所述第一极耳出卷芯的端点到所述焊印的极耳的长度。
如上所述的扣式电池，可选的，所述焊印包括点状焊印。
如上所述的扣式电池，可选的，所述点状焊印的边缘为圆形。
如上所述的扣式电池，可选的，所述点状焊印的直径不小于50μm。
如上所述的扣式电池，可选的，所述点状焊印的数量不小于2。
如上所述的扣式电池，可选的，所述顶盖组件包括上盖和顶盖，所述上盖自所述侧围壁的顶端往壳体的中轴线方向延伸，所述上盖设有环绕所述中轴线的中心孔，所述顶盖盖设在所述中心孔并与所述上盖密封。
第二方面，本发明提供一种扣式电池的制备方法，包括：
提供外壳，所述外壳包括壳体和顶盖组件，所述壳体包括底壁以及沿所述底壁的外边缘设置并往上延伸的侧围壁；
提供卷芯，所述卷芯包括正极片和负极片，所述卷芯的中心形成有空腔，并且所述正极片或负极片设置有第一极耳；
将卷芯放入壳体中，并使所述卷芯的第一极耳往所述壳体的底壁方向延伸并贴合于所述底壁；
使用激光焊接设备将所述第一极耳焊接于所述底壁，所述激光焊接设备的激光穿过所述空腔；
将所述卷芯的第二极耳焊接于所述顶盖组件的内侧；
将所述顶盖组件盖设于所述侧围壁的顶端并与所述侧围壁密封。
本发明的扣式电池的制备方法通过使用激光焊接设备将第一极耳焊接于壳体的底壁，一方面，相比于电阻焊接触加压的焊接方式，激光焊无需将激光焊接设备与第一极耳直接接触，而仅需将激光焊接设备发出的激光照射在第一极耳上即可实现将第一极耳与壳体的底壁进行焊接的目的，从而能够避免接触加压焊接导致的壳体形变，进而不仅有利于保证扣式电池的质量和性能，而且有利于提升扣式电池的成品率。
另一方面，激光焊接完成后仅会在第一极耳的焊接区域形成焊印，而壳体底壁的焊接区域的外表面则为光滑面，即，在将扣式电池装配入电子产品后，扣式电池的壳体的光滑面能够与电子产品的导电区域保持良好的接触，从而有利于保证扣式电池与电子产品之间的电连接效果，进而有利于提升扣式电池与电子产品之间的能量传递效率。
如上所述的扣式电池的制备方法，可选的，所述使用激光焊接设备将所述第一极耳焊接于所述底壁，包括：
将空心管插入所述卷芯的空腔内，并使所述空心管将所述第一极耳压紧于所述底壁，所述第一极耳的至少部分显露于所述空心管的内腔中；所述激光焊接设备发出的激光穿过所述空心管的内腔，并将所述第一极耳焊接于所述壳体的底壁。
如上所述的扣式电池的制备方法，可选的，所述空心管的高度大于所述卷芯的高度。
如上所述的扣式电池的制备方法，可选的，所述空心管的高度大于5mm。
如上所述的扣式电池的制备方法，可选的，所述空心管的外径在1mm至3mm之间；和/或，所述空心管的内径在0.5mm至2.8mm之间；和/或，所述空心管的壁厚在0.05mm至0.5mm之间。
如上所述的扣式电池的制备方法，可选的，所述空心管为金属空心管。
如上所述的扣式电池的制备方法，可选的，所述激光焊接设备采用脉冲打点的方式将所述第一极耳焊接于所述壳体的底壁。
如上所述的扣式电池的制备方法，可选的，所述将所述卷芯的第二极耳焊接于所述顶盖组件的内侧，包括：
将所述第二极耳裁切至预设长度；在顶盖组件朝向所述卷芯的一侧贴设绝缘胶圈，所述绝缘胶圈与所述顶盖同轴设置；将所述第二极耳焊接于所述顶盖位于所述绝缘胶圈内侧的部分。
如上所述的扣式电池的制备方法，可选的，所述第二极耳通过激光脉冲打点的方式焊接于所述顶盖。
如上所述的扣式电池的制备方法，可选的，所述顶盖组件包括上盖和顶盖，所述上盖的中心具有中心孔；
所述将所述顶盖组件盖设于所述侧围壁顶端并与所述侧围壁密封，包括：
将顶盖盖设于所述上盖的中心孔并与所述上盖绝缘密封；
将所述上盖盖设于所述侧围壁的顶端并与所述侧围壁焊接在一起
第三方面，本发明提供一种电子产品，包括如上任一项所述的扣式电池。
本发明的电子产品包括扣式电池，扣式电池包括外壳和卷芯，外壳包括壳体和顶盖组件，壳体和顶盖组件共同围合成用于容置卷芯的容置腔，卷芯能够通过外壳向外输出电能或者通过外壳接收外界输入的电能。卷芯包括第一极耳，第一极耳通过激光焊接的方式焊接于壳体的底壁，一方面，相比于电阻焊接触加压的焊接方式，激光焊无需将激光焊接设备与第一极耳直接接触，而仅需将激光焊接设备发出的激光照射在第一极耳上即可实现将第一极耳与壳体的底壁进行焊接的目的，从而能够避免接触加压焊接导致的壳体形变，进而不仅有利于保证扣式电池的质量和性能，而且有利于提升扣式电池的成品率。
另一方面，激光焊接完成后仅会在第一极耳的焊接区域形成焊印，而壳体底壁的焊接区域的外表面则为光滑面，即，在将扣式电池装配入电子产品后，扣式电池的壳体的光滑面能够与电子产品的导电区域保持良好的接触，从而有利于保证扣式电池与电子产品之间的电连接效果，进而有利于提升扣式电池与电子产品之间的能量传递效率。
附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作一简单地介绍，显而易见地，下面描述中的附图是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动性的前提下，还可以根据这些附图获得其他的附图。
图1为本发明实施例一提供的扣式电池的剖视图；
图2为本发明实施例一提供的扣式电池移除顶盖后的俯视图；
图3为本发明实施例二提供的卷芯装入壳体的过程示意图；
图4为本发明实施例二提供的空心管伸入卷芯空腔的过程示意图；
图5为本发明实施例二提供的空心管位于卷芯空腔内的剖视图；
图6为本发明实施例二提供的裁切第二极耳的结构示意图；
图7为本发明实施例二提供的顶盖贴胶的过程示意图；
图8为本发明实施例二提供的第二极耳与顶盖焊接后的结构示意图；
图9为本发明实施例二提供的顶盖与壳体焊接在一起后的结构示意图。
附图标记说明：
10-外壳；
110-顶盖组件；
111-上盖；
112-顶盖；
1121-注液孔；
113-绝缘胶圈；
120-壳体；
121-底壁；
20-卷芯；
210-第一极耳；
211-焊印；
220-第二极耳；
230-空腔；
30-空心管；
310-内腔。
具体实施方式
纽扣电池(buttoncell)也称扣式电池，是指外形尺寸象一颗小纽扣的电池。与柱状电池相比，扣式电池的直径较大，厚度较薄。由于扣式电池的体形较小，故在各种微型电子产品中得到了广泛的应用，例如，电脑主板，电子表，电子词典，电子秤，遥控器，电动玩具，心脏起搏器，电子助听器，计数器，照相机等。
扣式电池主要由外壳以及位于外壳内的卷芯组成。外壳包括壳体以及顶盖组件，其中，壳体包括底壁以及环绕底壁外边缘并往上延伸的侧围壁，顶盖组件盖设于侧围壁的顶端并与侧围壁密封，从而使得顶盖组件和壳体之间限定出用于容纳卷芯的容置腔。
顶盖组件包括设有中心孔的上盖，以及盖设在中心孔处的顶盖，换言之，上盖自侧围壁的顶端往壳体的中轴线方向延伸，并且上盖设有环绕壳体的中轴线的中心孔，顶盖盖设在中心孔上、并且顶盖与上盖之间密封。在一些实现方式中，顶盖和上盖焊接在一起，从而具有相同的电极性，上盖再通过绝缘密封件与侧围壁绝缘密封；在另一些实现方式中，上盖与侧围壁焊接在一起，顶盖和上盖之间通过绝缘密封件绝缘密封，从而顶盖和上盖具有相反的电极性。
卷芯则主要由层叠设置的正极片、第一隔膜、负极片和第二隔膜经卷绕形成，在卷芯的中心形成有至少部分与中心孔重叠的空腔。
在容置腔内还灌注有电解液，并且正极片设置有正极极耳、负极片设计有负极极耳，两个极耳中的一个与壳体的底壁焊接，另一个则与顶盖焊接。
在扣式电池加工制造的过程中，将卷芯的极耳与壳体的底壁进行焊接主要有两种操作方式，第一种操作方式为：首先将极耳与壳体进行焊接，然后将卷芯放入壳体中；第二种操作方式为：首先将卷芯放入壳体中，然后将极耳与壳体进行焊接。
对于第二种操作方式而言，在具体操作时是将电阻焊的焊针穿过卷芯的空腔与极耳接触以进行加压焊接。但是，第一方面，这种焊接方式容易导致壳体发生形变，既影响扣式电池的质量和性能，又影响扣式电池的成品率；第二方面，这种焊接方式会在壳体的外表面会形成焊接凸起，影响扣式电池与电子产品之间的电连接效果和能量传递效率；第三方面，这种焊接方式的 焊针磨损比较快，需要频繁更换焊针并对焊接设备进行调试，不仅影响生产效率，而且增加了焊针的成本。
为了解决上述技术问题，本发明提供一种扣式电池，该扣式电池的卷芯包括第一极耳，第一极耳通过激光焊接的方式焊接于壳体的底壁，第一方面，激光焊无需将激光焊接设备与第一极耳直接接触，避免了接触加压焊接导致的壳体形变，从而不仅有利于保证扣式电池的质量和性能，而且有利于提升扣式电池的成品率；第二方面，激光焊接完成后仅在第一极耳的焊接区域形成焊印，而壳体底壁的焊接区域的外表面则为光滑面，从而有利于保证扣式电池与电子产品之间的电连接效果及能量传递效率；第三方面，激光焊接无需更换焊针，从而不仅有利于提升生产效率，而且有利于降低生产成本。
为使本发明实施例的目的、技术方案和优点更加清楚，下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。
实施例一
图1为本发明实施例一提供的扣式电池的剖视图；图2为本发明实施例一提供的扣式电池移除顶盖后的俯视图。
参照图1和图2所示，本实施例提供一种扣式电池，该扣式电池包括外壳10和卷芯20，具体的，外壳10包括顶盖组件110和壳体120，壳体120和顶盖组件110共同围合成用于容置卷芯20的容置腔。
其中，顶盖组件110包括上盖111和顶盖112，上盖111自侧围壁的顶端往壳体120的中轴线方向延伸，在上盖111的中心设有环绕壳体120中轴线的中心孔，顶盖112盖设在中心孔并与上盖111密封。具体的，上盖111的外缘可以与壳体120焊接连接，上盖111的内缘与顶盖112的外缘搭接在一起，并且上盖111的内缘与顶盖112的外缘之间夹设有绝缘胶圈113。
进一步的，上盖111与顶盖1112搭接的接缝处可以涂覆密封胶，从而进一步保证顶盖组件110的密封性。
壳体120包括：底壁121以及沿底壁121的外边缘设置并往上延伸的侧围壁。壳体120的底壁121可以向下凸出形成凸面，示例性的，凸面可以为 锥形面，也可以为球形面，还可以为其他任意形状的凸面。凸面的设置能够增大扣式电池的内部空间，从而有利于提升扣式电池的循环性能。
基于上述可知，外壳10包括通过绝缘胶圈113绝缘连接的两部分，一部分为壳体120和上盖111，另一部分为顶盖112。当然，在另一些情况下，也可以是壳体120为一部分，上盖111和顶盖112为另一部分。
继续参考图1至图2，卷芯20包括正极片、负极片以及将正极片和负极片隔开的隔膜；正极片上设有正极耳，负极片上设有负极耳；卷绕过程中正极片、隔膜以及负极片从卷绕首端开始朝同一方向卷绕并最终形成卷绕式电芯，并且卷绕后的电芯中间形成有空腔230。也即是说，本实施例的卷芯20包括第一极耳210和第二极耳220，其中，第一极耳210为正极耳，第二极耳220为负极耳；或者，第一极耳210为负极耳，第二极耳220为正极耳。
其中，第一极耳210和第二极耳220分别与外壳的相互绝缘的两部分连接并导通，以使卷芯能够通过外壳向外输出电能，或者通过外壳接收外界输入的电能。例如，第一极耳210与壳体120电连接，第二极耳220则与壳体120电极性相反的顶盖112电连接。
示意性地，当上盖111与顶盖112的电极性相反时，第二极耳220可以与顶盖组件110中的顶盖112焊接连接；当上盖111与顶盖112的电极性相同时，第二极耳220可以与顶盖112或上盖111的任意一个焊接。当然，第二极耳220也可以与顶盖112或者上盖111通过其他方式连接，只要能够保证连接后的导电性能即可。
第一极耳210通过激光焊接的方式焊接于壳体120的底壁121，并且，第一极耳210的焊接区域具有焊印211，该焊印211位于底壁121与卷芯20的空腔230相重叠的部分内，壳体底壁121的焊接区域的外表面为光滑面。需要说明的是，壳体底壁的焊接区域的外表面为光滑面是指，激光将第一极耳210与壳体的底壁121焊接在一起后，焊印211仅形成在第一极耳210背离壳体底壁121的一面，即焊印211仅能够从壳体120内部观察到，而焊印并未延伸至壳体底壁背离第一极耳的一面，即壳体底壁的外表面没有焊印，因此，壳体底壁的焊接区域的外表面仍然保持壳体底壁的外表面在焊接前的形态，即光滑面的状态。
具体实现时，将卷芯20放入壳体120中，使第一极耳210与壳体的底壁121贴合，并使激光焊接设备发出的激光穿过卷芯20的空腔230，以将第一 极耳210焊接于壳体120的底壁121上，从而使第一极耳210的焊接区域具有焊印211，而壳体底壁121的焊接区域的外表面为光滑面。
可选地，从壳体120的侧围壁的顶端到焊印211的距离L1大于所述第一极耳210出卷芯20的端点到焊印211的极耳的长度L2。示例性地，图1中用G示意了侧围壁的顶端，用K示意了第一极耳210出卷芯20的端点，用O示意了焊印211。图1中示出了第一极耳210设置于卷芯20的外侧，从而第一极耳210出卷芯20的端点K也相应地位于卷芯20的外侧。
本实施例的扣式电池包括外壳10和卷芯20，外壳10包括壳体120和顶盖组件，壳体120和顶盖组件共同围合成用于容置卷芯20的容置腔，卷芯20能够通过外壳10向外输出电能或者通过外壳10接收外界输入的电能。卷芯20包括第一极耳210，第一极耳210通过激光焊接的方式焊接于壳体120的底壁121，一方面，相比于电阻焊接触加压的焊接方式，激光焊无需将激光焊接设备与第一极耳直接接触，而仅需将激光焊接设备发出的激光照射在第一极耳上即可实现将第一极耳与壳体的底壁进行焊接的目的，从而能够避免接触加压焊接导致的壳体形变，进而不仅有利于保证扣式电池的质量和性能，而且有利于提升扣式电池的成品率。
另一方面，激光焊接完成后仅会在第一极耳210的焊接区域形成焊印211，而壳体120的底壁121的焊接区域的外表面则为光滑面，即，在将扣式电池装配入电子产品后，扣式电池的壳体的光滑面能够与电子产品的导电区域保持良好的接触，从而有利于保证扣式电池与电子产品之间的电连接效果，进而有利于提升扣式电池与电子产品之间的能量传递效率。
在一种可能的实现方式中，激光焊接完成后在第一极耳210的焊接区域形成的焊印211可以包括点状焊印。示例性的，激光焊接设备可以通过脉冲打点的方式发出激光以将第一极耳210焊接在壳体的底壁121上，脉冲打点的方式形成的焊印211即为点状焊印。
具体的，本实施例的点状焊印的边缘可以为圆形。
进一步的，圆形点状焊印的直径不小于50μm，示例性的，圆形点状焊印的直径可以为50μm、60μm、70μm、80μm或者100μm等；或者，也可以根据实际需要设置圆形点状焊印的直径为不小于50μm的任意值。通过设置圆形点状焊印的直径不小于50μm，从而有利于保证第一极耳与壳体的底壁之间的焊接效果比较好，避免由于圆形点状焊印的直径太小，而影响极耳 与壳体的底壁之间的焊接效果。
本实施例的点状焊印的数量不小于2，示例性的，点状焊印的数量可以为2个、3个、4个、5个、6个或者8个等；或者，也可以根据实际需要设置点状焊印的数量为不小于2的任意值。
在另一种可能的实现方式中，激光焊接完成后在第一极耳210的焊接区域形成的焊印211可以包括线状焊印。示例性的，激光焊接设备发出的激光可以在第一极耳210上沿着线性路径移动，以将第一极耳210焊接在壳体120的底壁121上，激光在第一极耳210上线性移动焊接形成的焊印即为线状焊印。其中，线状焊印可以为直线、折线、曲线或者螺旋线等。
实施例二
图3为本发明实施例二提供的卷芯装入壳体的过程示意图；图4为本发明实施例二提供的空心管伸入卷芯空腔的过程示意图；图5为本发明实施例二提供的空心管位于卷芯空腔内的剖视图；图6为本发明实施例二提供的裁切第二极耳的结构示意图；图7为本发明实施例二提供的顶盖贴胶的过程示意图；图8为本发明实施例二提供的第二极耳与顶盖焊接后的结构示意图；图9为本发明实施例二提供的顶盖与壳体焊接在一起后的结构示意图。
参照图3至图9所示，本实施例提供一种扣式电池的制备方法，该扣式电池的制备方法包括：
S100：提供外壳。如图3所示，外壳10包括壳体120和顶盖组件110，其中，壳体120包括底壁121以及沿底壁121的外边缘设置并往上延伸的侧围壁，顶盖组件110包括上盖111和顶盖112，上盖111自侧围壁的顶端往壳体的中轴线方向并且在该上盖111的中心设有环绕中轴线的中心孔，顶盖112盖设于上盖111的中心孔并与上盖111密封。
S200：提供卷芯。如图3所示，卷芯20包括正极片和负极片，在卷芯的中心形成有至少部分与上盖111的中心孔重叠的空腔230，并且正极片或负极片设置有第一极耳210。
S300：将卷芯20放入壳体120中，并使卷芯20的第一极耳210往壳体120的底壁121方向延伸并贴合于壳体120的底壁121，参见图3。具体的，卷芯20的外径可以比壳体的内径小0.2mm至0.4mm，一方面，便于将卷芯放入壳体中；另一方面，给卷芯预留出膨胀的空间，避免扣式电池的内部压力 过大，从而有利于提升扣式电池的安全性能。
S400：使用激光焊接设备将第一极耳210焊接于底壁121，在焊接时，激光焊接设备的激光穿过卷芯20的空腔230。示例性的，激光焊接设备可以采用脉冲打点的方式将第一极耳210焊接于壳体的底壁121，以在第一极耳210的焊接区域形成点状焊印211；或者，激光焊接设备也可以采用连续焊接的方式将第一极耳焊接于壳体的底壁，以在第一极耳的焊接区域形成线状焊印或者其他形状的焊印。
可选地，从壳体120的侧围壁的顶端到焊印211的距离L1大于所述第一极耳210出卷芯20的端点到焊印211的极耳的长度L2。示例性地，图1中用G示意了侧围壁的顶端，用K示意了第一极耳210出卷芯20的端点，用O示意了焊印211。图1中示出了第一极耳210设置于卷芯20的外侧，从而第一极耳210出卷芯20的端点K也相应地位于卷芯20的外侧。
S500：将卷芯20的第二极耳220焊接于顶盖组件110的内侧，参照图8所示。例如，当上盖111与顶盖112的电极性相反时，第二极耳220焊接于顶盖112焊接的内侧；当上盖111与顶盖112的电极性相同时，第二极耳220焊接于顶盖112或上盖111的任意一个的内侧。
S600：将顶盖组件110盖设于壳体120的侧围壁的顶端并与侧围壁密封，以形成扣式电池，参照图9所示。例如，当上盖111与顶盖112的电极性相反时，将上盖111与侧围壁焊接；当上盖111与顶盖112的电极性相同时，上盖111与侧围壁通过密封胶圈绝缘密封连接。
本实施例的扣式电池的制备方法通过使用激光焊接设备将第一极耳210焊接于壳体120的底壁121，一方面，相比于电阻焊接触加压的焊接方式，激光焊无需将激光焊接设备与第一极耳直接接触，而仅需将激光焊接设备发出的激光照射在第一极耳上即可实现将第一极耳与壳体的底壁进行焊接的目的，从而能够避免接触加压焊接导致的壳体形变，进而不仅有利于保证扣式电池的质量和性能，而且有利于提升扣式电池的成品率。
另一方面，激光焊接完成后仅会在第一极耳的焊接区域形成焊印，而壳体底壁的焊接区域的外表面则为光滑面，即，在将扣式电池装配入电子产品后，扣式电池的壳体的光滑面能够与电子产品的导电区域保持良好的接触，从而有利于保证扣式电池与电子产品之间的电连接效果，进而有利于提升扣式电池与电子产品之间的能量传递效率。
其中，S400：使用激光焊接设备将第一极耳210焊接于底壁121，包括：
S401：将空心管30的一端伸入卷芯20的空腔230内，并与第一极耳210抵接，第一极耳210的至少部分显露于空心管30的内腔310中，参照图4和图5所示。
S402：激光焊接设备发出的激光穿过空心管30的内腔310，并将第一极耳210焊接于壳体的底壁121。
本实施例的空心管30，一方面，能够用于将第一极耳210压紧在壳体120的底壁121上，以防止第一极耳210与壳体的底壁121之间贴合不够紧密而导致虚焊，从而影响扣式电池的质量和性能；另一方面，能够将激光与卷芯20隔开，并对激光进行导向，从而不仅能够防止激光误伤到卷芯20，而且能够避免激光照射到焊接区域外的其他位置。
具体的，空心管30的高度大于卷芯20的高度，以保证空心管30将卷芯20与激光隔开，避免激光误伤卷芯20，从而不仅有利于保证扣式电池的质量和性能，而且有利于提升扣式电池的成品率。
进一步的，空心管30的高度大于5mm，示例性的，空心管30的高度可以为5mm、6mm、7mm、8mm、9mm或者10mm等；或者，也可以根据实际需要设置空心管30的高度为大于5mm的任意值。
在一种实现方式中，空心管30的外径在1mm至3mm之间，示例性的，空心管30的外径可以为1mm、1.5mm、2mm、2.5mm或者3mm等；或者，空心管30的外径也可以根据实际需要设置为1mm至3mm之间的任意值。
在其他实现方式中，空心管30的外径也可以根据实际需要设置为小于1mm或者大于3mm的任意值。
在一种实现方式中，空心管30的内径在0.5mm至2.8mm之间，示例性的，空心管30的内径可以为0.5mm、1mm、1.5mm、2mm或者2.8mm等；或者，空心管30的内径也可以根据实际需要设置为0.5mm至2.8mm之间的任意值。
在其他实现方式中，空心管30的内径也可以根据实际需要设置为小于0.5mm或者大于2.8mm的任意值。
在一种实现方式中，空心管30的壁厚在0.05mm至0.5mm之间，示例性的，空心管30的壁厚可以为0.05mm、0.15mm、0.3mm、0.4mm或者0.5mm等；或者，空心管30的壁厚也可以根据实际需要设置为0.05mm至0.5mm之 间的任意值。
在其他实现方式中，空心管30的壁厚也可以根据实际需要设置为小于0.05mm或者大于0.5mm的任意值。
在一种实现方式中，空心管30可以为金属空心管，示例性的，空心管可以为不锈钢空心管、铜空心管、铁空心管或者铝空心管等。
在其他实现方式中，空心管30也可以为其他耐高温的非金属材质，例如陶瓷空心管等。
其中，S500：将卷芯的第二极耳220焊接于顶盖组件的内侧，包括：
S501：将第二极耳220裁切至预设长度，参照图6所示。其中，第二极耳220的预设长度是能够保证第二极耳220与顶盖组件焊接连接的同时不会遮挡注液孔1121的长度，即，在裁切第二极耳220的过程中需要控制好第二极耳220的长度，避免第二极耳220的长度太长盖住注液孔1121，或者，第二极耳220的长度太短，影响第二极耳220与顶盖组件的焊接效果。
S502：在顶盖组件110朝向卷芯20的一侧贴设绝缘胶圈113，绝缘胶圈113与顶盖组件同轴设置，参照图7所示。绝缘胶圈113用于将卷芯20与顶盖组件110之间绝缘，以保证扣式电池的性能，避免扣式电池内部短路；绝缘胶圈113与顶盖组件同轴设置有利于保证绝缘胶圈113位于卷芯20的顶面与顶盖组件110之间，以避免绝缘胶圈113偏离引发短路。
S503：将第二极耳220焊接于顶盖组件110的内侧，参照图8所示。在一种实现方式中，可以采用激光焊接方式将第二极耳焊接于顶盖组件110的内侧，从而一方面有利于避免顶盖发生形变，另一方面，可以避免在顶盖组件110的外表面形成焊印；在另一种实现方式中，也可以采用电阻焊等焊接方式将第二极耳焊接于顶盖组件110的内侧，此处不再赘述。
进一步的，第二极耳可以通过激光脉冲打点的方式焊接于顶盖组件110的内侧，或者第二极耳也可以通过激光连续焊接的方式焊接于顶盖组件110的内侧。
其中，S600：将顶盖组件110盖设于壳体120的侧围壁的顶端并与壳体120的侧围壁密封，以形成扣式电池，包括：
S601：将顶盖112盖设于上盖111的中心孔处并与上盖111绝缘密封。具体的，将顶盖112焊接有第二极耳220的一面向下盖合在上盖111的中心孔处。
S602：将上盖111盖设于壳体120的侧围壁的顶端并与该侧围壁焊接在一起。具体的，上盖111与壳体120的侧围壁之间的焊接方式可以为电阻焊，也可以为激光焊，还可以为其他焊接方式。例如，在焊接的时候，可以采用侧焊的方式或者包圆角脉冲焊接的方式将上盖111与壳体120的侧围壁焊接在一起。此外，焊接后可以对焊接处进行密封性检测，以保证扣式电池密封性，从而有利于保证扣式电池的质量和性能。
实施例三
本实施例提供一种电子产品，该电子产品包括扣式电池。
本实施例中的扣式电池与实施例一提供的扣式电池的结构相同，并能带来相同或者类似的技术效果，在此不再一一赘述，具体可参照上述实施例的描述。
在本发明的描述中，需要理解的是，术语“顶”、“底”、“上”、“下”(如果存在)等指示的方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述本发明和简化描述，而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本发明的限制。
在本发明的描述中，需要说明的是，除非另有明确的规定和限定，术语“安装”、“相连”、“连接”应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或一体地连接；可以是机械连接，也可以是电连接；可以是直接相连，也可以通过中间媒介间接相连，可以是两个元件内部的连通。对于本领域的普通技术人员而言，可以通过具体情况理解上述术语在本发明中的具体含义。
本申请的说明书和权利要求书及上述附图说明中的术语“第一”、“第二”是用于区别类似的对象，而不必用于描述特定的顺序或先后次序。应该理解这样使用的数据在适当情况下可以互换，以便这里描述的本申请的实施例例如能够以除了在这里图示或描述的那些以外的顺序实施。
最后应说明的是：以上各实施例仅用以说明本发明的技术方案，而非对其限制；尽管参照前述各实施例对本发明进行了详细的说明，本领域的普通技术人员应当理解：其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分或者全部技术特征进行等同替换；而这些修改或者替换，并不使相应技术方案的本质脱离本发明各实施例技术方案的范围。

Claims (10)

  1. 一种扣式电池，其中，包括外壳和卷芯；
    所述外壳包括壳体和顶盖组件，其中，所述壳体包括：底壁以及沿所述底壁的外边缘设置并往上延伸的侧围壁，所述顶盖组件盖设在所述侧围壁的顶端并与所述侧围壁密封，所述壳体和所述顶盖组件共同围合成用于容置所述卷芯的容置腔；
    所述卷芯包括正极片和负极片，所述卷芯的中心形成有空腔，并且所述正极片或负极片设置有往所述底壁方向延伸的第一极耳，所述第一极耳通过激光焊接的方式焊接于所述壳体的底壁；
    所述第一极耳的焊接区域具有焊印，所述焊印位于所述底壁与所述空腔相重叠的部分内，激光将所述第一极耳与所述底壁焊接在一起后，所述焊印仅形成在所述第一极耳背离所述底壁的一面。
  2. 根据权利要求1所述的扣式电池，其中，所述侧围壁的顶端到所述焊印的距离大于所述第一极耳出卷芯的端点到所述焊印的极耳的长度。
  3. 根据权利要求2所述的扣式电池，其中，所述焊印包括点状焊印，所述点状焊印的边缘为圆形；和/或，
    所述点状焊印的直径不小于50μm；和/或，
    所述点状焊印的数量不小于2。
  4. 根据权利要求1所述的扣式电池，其中，所述顶盖组件包括上盖和顶盖，所述上盖与所述侧围壁焊接并自所述侧围壁的顶端往壳体的中轴线方向延伸，所述上盖设有环绕所述壳体的中轴线的中心孔，所述顶盖盖设在所述中心孔处并与所述上盖绝缘密封。
  5. 一种扣式电池的制备方法，其中，包括：
    提供外壳，所述外壳包括壳体和顶盖组件，所述壳体包括底壁以及沿所述底壁的外边缘设置并往上延伸的侧围壁；
    提供卷芯，所述卷芯包括层叠设置的正极片和负极片，所述卷芯的中心形成有空腔，并且所述正极片或负极片设置有第一极耳；
    将卷芯放入壳体中，并使所述卷芯的第一极耳往所述壳体的底壁方向延伸并贴合于所述底壁；
    使用激光焊接设备将所述第一极耳焊接于所述底壁，所述激光焊接设备 的激光穿过所述空腔；
    将所述卷芯的第二极耳焊接于所述顶盖组件的内侧；
    将所述顶盖组件盖设于所述侧围壁的顶端并与所述侧围壁密封。
  6. 根据权利要求5所述的扣式电池的制备方法，其中，所述使用激光焊接设备将所述第一极耳焊接于所述底壁，包括：
    将空心管插入所述卷芯的空腔内，并使所述空心管将所述第一极耳压紧于所述底壁，所述第一极耳的至少部分显露于所述空心管的内腔中；
    所述激光焊接设备发出的激光穿过所述空心管的内腔，并将所述第一极耳焊接于所述壳体的底壁。
  7. 根据权利要求6所述的扣式电池的制备方法，其中，所述激光焊接设备采用脉冲打点的方式将所述第一极耳焊接于所述壳体的底壁。
  8. 根据权利要求6所述的扣式电池的制备方法，其中，所述将所述卷芯的第二极耳焊接于所述顶盖组件的内侧，包括：
    将所述第二极耳裁切至预设长度；
    在顶盖组件朝向所述卷芯的一侧贴设绝缘胶圈，所述绝缘胶圈与所述顶盖组件同轴设置；
    将所述第二极耳焊接于所述顶盖组件位于所述绝缘胶圈内侧的部分。
  9. 根据权利要求8所述的扣式电池的制备方法，其中，所述第二极耳通过激光脉冲打点的方式焊接于所述顶盖。
  10. 根据权利要求8或9所述的扣式电池的制备方法，其中，所述顶盖组件包括上盖和顶盖，所述上盖的中心具有中心孔；
    所述将所述顶盖组件盖设于所述侧围壁顶端并与所述侧围壁密封，包括：
    将顶盖盖设于所述上盖的中心孔并与所述上盖绝缘密封；
    将所述上盖盖设于所述侧围壁的顶端并与所述侧围壁焊接在一起。
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