WO2022028332A1 - 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
WO2022028332A1
WO2022028332A1 PCT/CN2021/109784 CN2021109784W WO2022028332A1 WO 2022028332 A1 WO2022028332 A1 WO 2022028332A1 CN 2021109784 W CN2021109784 W CN 2021109784W WO 2022028332 A1 WO2022028332 A1 WO 2022028332A1
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WO
WIPO (PCT)
Prior art keywords
tab
bottom wall
winding core
casing
top cover
Prior art date
Application number
PCT/CN2021/109784
Other languages
English (en)
French (fr)
Inventor
彭宁
谢斌
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 EP21852823.0A priority Critical patent/EP4050708A1/en
Publication of WO2022028332A1 publication Critical patent/WO2022028332A1/zh
Priority to US17/746,974 priority patent/US20220278375A1/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
    • H01M10/058—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
    • 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
    • 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
    • H01M50/50—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
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/538—Connection of several leads or tabs of wound or folded electrode stacks
    • 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
    • H01M50/60—Arrangements or processes for filling or topping-up with liquids; Arrangements or processes for draining liquids from casings
    • H01M50/609—Arrangements or processes for filling with liquid, e.g. electrolytes
    • H01M50/627—Filling ports
    • H01M50/636—Closing or sealing filling ports, e.g. using lids
    • 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 and cameras. With the increasing demand for button batteries, the processing and manufacturing process of button batteries has also received more and more attention.
  • the invention provides a button-type battery and a preparation method thereof. During the welding between the tab and the shell of the button-type battery, the winding core is not easily damaged by mistake, so that the quality and performance of the button-type battery can be guaranteed to meet the requirements. , which is beneficial to improve the yield of the button battery.
  • the present invention provides a button-type battery, comprising a casing and a winding core;
  • the housing includes a casing and a top cover assembly, wherein the casing includes: a bottom wall and a side wall extending upward along the outer edge of the bottom wall, and the top cover assembly is covered on the bottom wall.
  • the top end of the side wall is sealed with the side wall, and the casing and the top cover assembly together form an accommodating cavity for accommodating 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 one of the positive electrode sheet or the negative electrode sheet is provided with a first tab extending toward the bottom wall, the The other one of the positive electrode sheet and the negative electrode sheet is provided with a second tab extending in the opposite direction of the bottom wall, the first tab is welded with the bottom wall of the casing, and the second tab is connected to the top
  • the inner side of the cover assembly is welded;
  • the top cover assembly is provided with a liquid injection hole, and the liquid injection hole at least partially overlaps with the cavity of the winding core; the welding marks of the first tab and the bottom wall are located between the bottom wall and the within the overlapping portion of the cavity and the liquid injection hole.
  • the button-type battery of the present invention includes an outer casing and a winding core, the outer 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 includes a collecting plate, a negative electrode sheet, The first tab and the second tab, the first tab is welded and connected to the bottom wall of the casing, and the second tab is connected to the top cover assembly, so that the winding core can transmit electrical energy to the outside through the casing and the top cover assembly or Receive electrical energy input from the outside world.
  • the liquid injection hole is at least partially overlapped with the cavity of the winding core, and at the same time, by arranging the welding area between the first tab and the bottom wall of the casing and the cavity of the winding core at least partially Overlap, so that the welding area of the first tab of the button battery and the bottom wall of the casing can be exposed to the field of view through the liquid injection hole and the cavity of the winding core, so that the welding equipment can be easily installed during the manufacturing process of the button battery.
  • the welding mark of the first tab and the bottom wall is located between the bottom wall and the bottom wall. In the overlapping part of the cavity and the injection hole.
  • the button battery of the present invention can be used after the top cover assembly is closed on the casing. , so that the welding equipment passes through the injection hole of the top cover assembly and the cavity of the winding core to weld the first tab and the bottom wall of the casing.
  • the existence of the top cover assembly can protect the winding core to a certain extent. , which is beneficial to prevent the welding equipment from accidentally damaging the winding core during the welding process, thereby helping to ensure that the quality and performance of the button battery meet the requirements, and thus helping to improve the yield of the button battery.
  • 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 welding area of the first tab away from the bottom wall of the casing has a welding mark, and the welding area of the bottom wall of the casing away from the first tab is: smooth side.
  • the welding area of the bottom wall of the case away from the first tab has a welding mark, and the welding area of the first tab away from the bottom wall of the case is smooth noodle.
  • the bottom wall of the casing and the top cover assembly jointly clamp the winding core in the accommodating cavity.
  • an insulating hollow tube is sleeved in the cavity of the winding core, the top of the insulating hollow tube abuts on the top cover, and the bottom of the insulating hollow tube is in contact with the top cover. abutting on the first tab; the liquid injection hole at least partially overlaps with the top opening of the insulating hollow tube.
  • the insulating hollow tube is a rubber hollow tube; and/or, the wall of the insulating hollow tube is provided with a through hole.
  • the insulating hollow tube, the liquid injection hole, and the cavity of the winding core are coaxially arranged, and the inner diameter of the insulating hollow tube is larger than the diameter of the liquid injection hole. diameter.
  • the top cover assembly includes an upper cover and a top cover
  • the outer edge of the upper cover is welded with the side wall, the inner edge of the upper cover is overlapped with the outer edge of the top cover, and the inner edge of the upper cover is connected to the outer edge of the top cover.
  • An insulating seal is sandwiched between the edges;
  • the second tab is welded with the inner side of the top cover, and the liquid injection hole is located on the top cover.
  • a seam where the upper cover and the top cover overlap is coated with sealant.
  • the bottom wall of the casing protrudes downward to form a convex surface.
  • the present invention provides a method for preparing a button battery, comprising:
  • An enclosure including a housing and a top cover assembly, wherein the housing includes a bottom wall and side walls disposed along an outer edge of the bottom wall and extending upward, the top cover assembly being provided with an insulating Seals;
  • a winding core is provided, the winding core includes a positive electrode sheet and a negative electrode sheet arranged in layers, a cavity is formed in the center of the winding core, and one of the positive electrode sheet or the negative electrode sheet is provided with a first tab, and the positive electrode sheet is provided with a first tab.
  • the other one of the sheet and the negative sheet is provided with a second tab, and the second tab and the first tab respectively extend in opposite directions;
  • the top cover assembly is covered on the top end of the side wall and sealed with the side wall, the top cover assembly is provided with a liquid injection hole, and the liquid injection hole and the cavity of the winding core are at least partially overlapping;
  • the first tab and the bottom wall of the housing are welded together by a welding device, wherein the energy emitted by the welding device or an auxiliary tool of the welding device passes through the injection hole and the coil core cavity.
  • the lid assembly is covered on the top end of the side wall and sealed with the side wall by laser welding.
  • the top cover assembly is covered with the top of the side wall of the casing and sealed with the side wall, and at the same time, the top cover assembly is provided with a liquid injection hole, so that the liquid injection hole and the winding core are formed.
  • the cavities at least partially overlap; and the first tab is welded to the bottom wall of the housing by a welding device, wherein energy from the welding device or an auxiliary tool of the welding device passes through the injection hole and the cavity of the winding core.
  • the existence of the top cover assembly can It has a certain protective effect on the winding core, and prevents the welding equipment from accidentally hurting the winding core during the welding process, which is beneficial to ensure that the quality and performance of the button battery meet the requirements, and thus help to improve the yield of the button battery.
  • the welding equipment is resistance welding equipment, and the welding needle of the resistance welding equipment passes through the liquid injection hole and the cavity of the winding core, and the welding The first tab is pressed and welded on the bottom wall of the casing.
  • the welding needle can pass through the liquid injection hole and the cavity of the winding core to press the first tab and the bottom wall of the casing, so as to ensure the gap between the first tab and the bottom wall of the casing
  • the reliability of the welding avoids that the first tab and the bottom wall of the casing are not tightly fitted, resulting in virtual welding, thereby helping to ensure the quality and performance of the button battery.
  • the welding equipment includes a laser welding equipment and a hollow tube, the hollow tube passes through the liquid injection hole and the cavity of the winding core, and the The first tab is pressed against the bottom wall of the casing; the laser light emitted by the laser welding equipment passes through the inner cavity of the hollow tube and irradiates the first tab, so as to connect the first tab
  • the tabs and the bottom wall of the casing are welded together.
  • the welding equipment includes a laser welding equipment and a welding auxiliary, and the welding auxiliary passes through the liquid injection hole and the cavity of the winding core to connect
  • the first tab is pressed against the bottom wall of the casing; the laser welding equipment welds from the bottom of the casing to weld the bottom wall of the casing and the first tab together.
  • the hollow tube or the welding aid can pass through the liquid injection hole and the cavity of the winding core to press the first tab and the bottom wall of the casing, so as to ensure the first tab and the bottom of the casing.
  • the reliability of the welding between the walls avoids the weak welding between the first tab and the bottom wall of the casing caused by poor adhesion, thereby helping to ensure the quality and performance of the button battery.
  • the laser emitted by the laser welding equipment directly irradiates the first tab through the liquid injection hole and the cavity of the winding core, compared with the prior art, before the top cover is closed, the The welding method of the tab and the bottom wall of the shell has the following advantages:
  • the existence of the top cover assembly can protect the winding core to a certain extent, preventing the welding equipment from accidentally damaging the winding core during the welding process, which is conducive to ensuring that the quality and performance of the button battery meet the requirements, which is conducive to improving
  • the welding process is convenient and fast, which is conducive to improving the processing efficiency of button batteries.
  • the present invention provides an electronic product including the above-mentioned button battery.
  • 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 includes a first tab and a second tab, the first tab is welded to the bottom wall of the casing, and the second tab is connected to the top cover, so that the winding core can transmit electrical energy to the outside through the casing and the top cover assembly or Receive electrical energy input from the outside world.
  • the liquid injection hole is at least partially overlapped with the cavity of the winding core, and at the same time, by arranging the welding area between the first tab and the bottom wall of the casing and the cavity of the winding core at least partially Overlap, so that the welding area of the first tab of the button battery and the bottom wall of the casing can be exposed to the field of view through the liquid injection hole and the cavity of the winding core, so that the welding equipment can be easily installed during the manufacturing process of the button battery.
  • the welding mark of the first tab and the bottom wall is located between the bottom wall and the bottom wall. In the overlapping part of the cavity and the injection hole.
  • the button battery of the present invention makes the welding equipment more stable after the top cover assembly is installed.
  • a part passes through the liquid injection hole of the top cover assembly and the cavity of the winding core to press the first tab and the bottom wall of the casing, and then the energy of the welding equipment is transferred from the liquid injection hole and the cavity to the first tab.
  • the existence of the top cover assembly can protect the winding core to a certain extent, which is beneficial to avoid accidental damage to the winding core by the welding equipment during the welding process, thereby helping to ensure that the quality and performance of the button battery meet the requirements, and then It is beneficial to improve the yield of button batteries.
  • FIG. 1 is a schematic structural diagram of a button battery according to Embodiment 1 of the present invention.
  • FIG. 2 is a cross-sectional view 1 of a button battery according to Embodiment 1 of the present invention.
  • FIG. 3 is a second cross-sectional view of the button battery according to the first embodiment of the present invention.
  • FIG. 4 is a schematic structural diagram of the second tab provided in Embodiment 2 of the present invention after being welded to the top cover and placed in the housing;
  • FIG. 5 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. 6 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.
  • FIG. 7 is a cross-sectional view of the hollow tube passing through the liquid injection hole and the winding core cavity 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, and a liquid injection hole is provided in the center of the top cover.
  • the axial direction extends, and the upper cover is provided with a central hole surrounding the central axis of the casing, 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 present invention provides a button-type battery.
  • the button-type battery is provided with a liquid injection hole on the top cover assembly, and the liquid injection hole is at least partially overlapped with the cavity of the winding core.
  • the welding area of a tab and the bottom wall of the casing at least partially overlaps the cavity of the winding core, so that the welding area of the first tab of the button battery and the bottom wall of the casing can pass through the liquid injection hole and the cavity of the winding core Revealed in the field of view, so that the welding equipment can pass directly through the liquid injection hole of the top cover and the cavity of the winding core, and weld the first tab and the bottom wall of the housing together, that is, the first tab and the
  • the welding mark of the bottom wall is located in the part where the bottom wall overlaps with the cavity and the liquid injection hole.
  • the top cover assembly can protect the winding core to a certain extent, so as to prevent the welding equipment from accidentally hurting the winding core during the welding process, so as to ensure that the quality and performance of the button battery meet the requirements, which is conducive to improving the quality of the button battery. At the same time, it is beneficial to improve the production efficiency of button batteries.
  • FIG. 1 is a schematic structural diagram of a button battery provided by Embodiment 1 of the present invention
  • FIG. 2 is a cross-sectional view of a button battery provided by Embodiment 1 of the present invention
  • FIG. 3 is a cross-sectional view of the button battery provided by Embodiment 1 of the present invention.
  • the present embodiment provides a button-type battery
  • the button-type battery includes a casing 10 and a winding core 20
  • the casing 10 includes a casing 110 and a top cover assembly 120
  • the casing 110 and The top cover assemblies 120 together form an accommodating cavity for accommodating the winding core 20 .
  • the housing 110 includes: a bottom wall 111 and a side surrounding wall arranged along the outer edge of the bottom wall 111 and extending upward.
  • the bottom wall 111 of the housing 110 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 top cover assembly 120 includes an upper cover 121 and a top cover 122.
  • the upper cover 121 extends from the top end of the side wall to the central axis of the casing 110.
  • the center of the upper cover 121 is provided with a central hole surrounding the central axis of the casing 110.
  • the top cover 122 covers the central hole and is sealed with the top cover 121 .
  • the outer edge of the upper cover 121 can be connected to the housing 110 by welding, the inner edge of the upper cover 121 and the outer edge of the top cover 122 are overlapped together, and the inner edge of the upper cover 121 and the outer edge of the top cover 122 are connected together.
  • An insulating seal 123 is sandwiched therebetween.
  • a seam where the upper cover 121 and the top cover 122 are overlapped may be coated with sealant, so as to further ensure the tightness of the top cover assembly 120 .
  • the housing 10 includes two parts that are insulated and connected by an insulating seal 123 , one part is the casing 110 and the upper cover 121 , and the other part is the top cover 122 .
  • the housing 110 may also be a part, and the upper cover 121 and the top cover 122 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 welded with a positive electrode lug, and the negative electrode sheet is welded with a negative electrode lug; 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 positive and negative tabs of the winding core 20 are respectively connected to and conduct with the two insulated parts of the outer casing, so that the winding core 20 can output electric energy through the outer casing 10 or receive externally input electric energy through the outer casing 10 .
  • 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.
  • the first tab 210 is connected to the bottom wall 111 of the casing 110 by welding, and the second tab 220 is electrically connected to the top cover 112 of the top cover assembly 120 having the opposite polarity to that of the casing 110 .
  • the second tab 220 can be welded to the top cover 122 in the top cover assembly 120; when the electrical polarities of the upper cover 121 and the top cover 122 are the same , the second tab 220 can be welded with either the top cover 122 or the upper cover 121 .
  • the second tab 220 can also be connected to the top cover 122 or the upper cover 121 by other means, as long as the electrical conductivity after the connection can be ensured.
  • the top cover 122 is provided with a liquid injection hole 1221, and the liquid injection hole 1221 at least partially overlaps with the cavity 230 of the winding core 20;
  • the cavity 230 is at least partially overlapped, so that the welding area of the first tab 210 of the button battery and the bottom wall 111 of the case can be exposed to the field of view through the liquid injection hole 1221 and the cavity 230 of the winding core 20 .
  • the button battery when assembling the button battery, first put the winding core 20 into the casing 110 , make the first tab 210 fit with the bottom wall 111 of the casing 110 , and connect the second tab 220 with the top cover.
  • the inner side of the assembly 120 is welded; then the top cover assembly 120 with the insulating sealing rubber ring is placed on the top of the side wall of the casing 110, and is welded with the side wall, so as to realize the top cover assembly 120 and the casing. 110 sealed connection.
  • a part of the welding equipment is passed through the liquid injection hole 1221 and the cavity 230 of the winding core 20 so as to press the first tab 210 against the bottom wall 111 of the housing 110, and then the main working part of the welding equipment generates sufficient The energy of melting the first tab 210 and the bottom wall 111 against the surface, thereby welding the first tab 210 and the bottom wall 111 of the housing 110 together.
  • the top cover assembly 120 can protect the top of the winding core 20 from being accidentally damaged by the welding equipment during the welding process.
  • the distance L1 from the top end of the side wall of the housing 110 to the solder print 211 is greater than the length L2 from the end point of the first tab 210 out of 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. 2 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 110 and a top cover assembly 120
  • the casing 110 and the top cover assembly 120 together form an accommodating cavity for accommodating the winding core 20
  • the winding core 20 includes a first tab 210 and a second tab 220.
  • the first tab 210 is welded to the bottom wall 111 of the housing 110
  • the second tab 220 is connected to the top cover assembly 120, so that the winding core 20 can be Through the casing 110 and the top cover assembly 120 , electrical energy is delivered to the outside or received externally input electrical energy.
  • the liquid injection hole 1221 is at least partially overlapped with the cavity 230 of the winding core 20, and at the same time, by arranging the welding area between the first tab 210 and the bottom wall 111 of the shell and the winding
  • the cavity 230 of the core 20 is at least partially overlapped, so that the welding area of the first tab 210 of the button battery and the bottom wall 111 of the case can be exposed to the field of view through the liquid injection hole 1221 and the cavity 230 of the winding core 20, so that In the process of manufacturing the button battery, the welding equipment can directly pass through the liquid injection hole 1221 of the top cover 122 and the cavity 230 of the winding core 20, and weld the first tab 210 and the bottom wall 111 of the casing 110 on the top cover 122. Together, that is, the welding marks of the first tab 210 and the bottom wall 111 are located in the overlapping portion of the bottom wall 111 with the cavity 230 and the liquid injection hole 1221 .
  • the button battery of this embodiment is closed after the top cover assembly 120 is closed.
  • the first tab 210 and the bottom wall 111 of the casing are welded by the welding equipment passing through the liquid injection hole 1221 of the top cover 122 and the cavity 230 of the winding core 20 .
  • Playing a certain protective role is beneficial to avoid accidental damage to the winding core 20 by the welding equipment during the welding process, thereby helping to ensure that the quality and performance of the button battery meet the requirements, and thus helping to improve the yield of the button battery.
  • the welding area of the first tab 210 facing away from the bottom wall 111 of the casing has a welding mark, and the welding area of the bottom wall 111 facing away from the first tab 210 is a smooth surface.
  • the welding device can weld the first tab 210 and the bottom wall 111 of the housing 110 together from the top of the button battery.
  • the welding device can be a resistance welding device.
  • the needle can pass through the liquid injection hole and the cavity of the winding core to abut with the first tab to weld the first tab on the bottom wall of the housing;
  • the welding device can also be a laser welding device, a laser welding device The emitted laser can be directly irradiated on the first tab through the liquid injection hole and the cavity of the winding core, so as to weld the first tab on the bottom wall of the casing.
  • a welding mark is formed on the welding area where the first tab 210 faces away from the bottom wall 111 of the case, and the case
  • the welding area of the bottom wall 111 away from the first tab 210 is a smooth surface, that is, the welding print can only be observed from the inside of the housing 110 , and the welding print does not extend to the area where the bottom wall 111 of the housing faces away from the first tab 210 .
  • One side, that is, the outer surface of the casing bottom wall 111 has no welding marks.
  • the outer surface of the welding area of the casing bottom wall 111 still maintains the shape of the outer surface of the casing bottom wall 111 before welding, that is, the smooth surface state. Therefore, after the button battery is assembled into the electronic product, the smooth surface of the shell of the button battery can keep good contact with the conductive area of the electronic product, so as to ensure the electrical connection effect between the button battery and the electronic product. It is beneficial to improve the energy transfer efficiency between the button battery and electronic products.
  • the welding area of the bottom wall 111 of the casing facing away from the first tab 210 has a welding mark, and the welding area of the first tab 210 facing away from the bottom wall 111 of the casing is a smooth surface.
  • the welding device may weld the bottom wall 111 of the case 110 and the first tab 210 together from the bottom of the button battery upwards.
  • the welding device may be a laser welding device, and the laser welding device may include auxiliary Welding parts and auxiliary welding parts can abut with the first tab through the liquid injection hole and the cavity of the winding core, so as to press the first tab on the bottom wall of the casing, and the laser emitted by the laser welding equipment can be The bottom of the button cell is irradiated upward on the outer surface of the case to weld the bottom wall of the case and the first tab together.
  • a welding mark is formed on the welding area where the bottom wall 111 of the case faces away from the first tab 210, and the first tab 210 is welded.
  • the welding area of the tab 210 away from the bottom wall 111 of the casing is a smooth surface, that is, the welding mark can only be observed from the outer surface of the casing 110 , and the welding mark does not extend to the first tab 210 away from the bottom wall 111 of the casing.
  • One side that is, the surface of the first tab 210 has no welding marks, so the surface of the welding area of the first tab 210 still maintains the state of the surface of the first tab 210 before welding, that is, a smooth surface state. Therefore, it is possible to prevent the welding marks on the tabs from adversely affecting the winding core, thereby helping to improve the quality and safety performance of the button battery.
  • the bottom wall 111 of the casing 110 and the top cover assembly 120 jointly clamp the winding core 20 in the accommodating cavity, so as to prevent the winding core 20 from shaking during the welding process, thereby further preventing the welding equipment from accidentally damaging the winding core, In this way, the quality and performance of the button battery can be guaranteed to meet the requirements, which is beneficial to improve the yield of the button battery, and at the same time, it is beneficial to improve the production efficiency of the button battery.
  • an insulating hollow tube 240 is sleeved in the cavity 230 of the winding core 20, the top of the insulating hollow tube 240 abuts against the top cover assembly 120, and the bottom of the insulating hollow tube 240 abuts against the first tab 210; and
  • the liquid injection hole 1221 at least partially overlaps the top opening of the insulating hollow tube 240 . Therefore, the welding area of the first tab 210 of the button battery and the bottom wall 111 of the casing can be exposed to the field of view through the liquid injection hole 1221 and the insulating hollow tube 240, so that the welding equipment can be easily installed during the manufacturing process of the button battery.
  • the first tab 210 and the bottom wall 111 of the housing 110 can be welded together directly through the liquid injection hole 1221 of the top cover assembly 120 and the insulating hollow tube 240 .
  • the insulating hollow tube 240 can form protection for the inner wall of the cavity 230 of the winding core 20 to prevent the welding equipment from accidentally damaging the inner wall of the winding core cavity 230 .
  • the insulating hollow tube 240 may be a rubber hollow tube, which has insulating properties, so as to avoid the short circuit inside the button battery; of course, the insulating hollow tube 240 may also be other insulating materials, as long as the The requirements are sufficient, and will not be repeated here.
  • the wall of the insulating hollow tube 240 is provided with through holes, and there may be multiple through holes, so as to ensure that the electrolyte injected into the button battery can fully infiltrate the winding core.
  • the insulating hollow tube 240 , the liquid injection hole 1221 and the cavity 230 of the winding core 20 may be arranged coaxially, and the inner diameter of the insulating hollow tube 240 is larger than the diameter of the liquid injection hole 1221 , so that the top of the insulating hollow tube 240 abuts on the top cover around the liquid injection hole 1221 .
  • the liquid injection hole 1221 and the insulating hollow tube 240 can sufficiently expose the first tab 210 located at the bottom of the insulating hollow tube 240 in the field of vision, so as to facilitate subsequent operations on the first tab 210 and the bottom wall 111 of the housing.
  • the liquid injection hole 1221 is completely located inside the insulating hollow tube 240, that is, the insulating hollow tube 240 separates the liquid injection hole 1221 from the inner wall of the winding core cavity 230, thereby avoiding sealing the liquid injection with a sealing nail In the process of the hole 1221, the inner wall of the core cavity 230 is damaged.
  • any two of the insulating hollow tube 240, the liquid injection hole 1221 and the cavity 230 of the winding core 20 can also be set to be coaxial according to actual needs, or all three of them can be set to be different, as long as the The requirements of the embodiments are sufficient, and details are not repeated here.
  • FIG. 4 is a schematic structural diagram of the second tab provided by the second embodiment of the present invention after welding with the top cover and put it into the casing;
  • FIG. 5 is a schematic diagram of the process of loading the winding core into the casing according to the second embodiment of the present invention.
  • 6 is a schematic view of the structure after the top cover and the shell are welded together according to the second embodiment of the present invention;
  • this embodiment provides a method for preparing a button-type battery, and the method for preparing the button-type battery includes:
  • housing 10 is provided. As shown in FIG. 3 , the housing 10 includes a casing 110 and a top cover assembly 120 , wherein the casing 110 includes a bottom wall 111 and a side wall arranged along the outer edge of the bottom wall 111 and extending upward, and the top cover assembly 120 is With insulating seal.
  • the core 20 is provided. As shown in FIG. 3, the winding core 20 includes a positive electrode sheet and a negative electrode sheet, a cavity 230 is formed in the center of the winding core 20, and one of the positive electrode sheet and the negative electrode sheet is provided with a first tab 210, the positive electrode sheet and the negative electrode sheet One of the electrodes is provided with a second tab 220, and the second tab 220 and the first tab 210 extend in opposite directions respectively.
  • the first tab 210 may be a positive tab, and the second tab 220 may be a negative tab; or, the first tab 210 may be a negative tab, and the second tab 220 may be a positive tab.
  • the second tab 220 can be welded to the top cover assembly 120 by laser welding, which is beneficial to avoid deformation of the top cover assembly 120 on the one hand, and avoid the deformation of the top cover assembly 120 on the other hand.
  • the second tab 220 may be welded to the top cover assembly 120 by welding methods such as resistance welding, which will not be repeated here.
  • S400 Place the winding core 20 in the casing 110, referring to FIG. 4 .
  • the first tabs 210 of the winding core 20 extend toward the bottom wall 111 of the casing 110 and are in contact with the bottom wall 111 .
  • the outer diameter of the winding core 20 may be smaller than the inner diameter of the casing 110 by 0.2 mm to 0.4 mm.
  • the winding core 20 can also be placed in the casing 110 first, and then the second tab 220 can be welded to the inner side of the top cover assembly 120 as shown in FIG. 4 .
  • the distance L1 from the top end of the side wall of the casing 110 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 upper cover 121 in the top cover assembly 120 can be sealed with the casing 110 by welding, and the welding method of the two is It can be resistance welding, laser welding, or other welding methods; in addition, after welding, the sealing of the welding can be tested to ensure the tightness of the button battery, which is beneficial to ensure the quality and performance of the button battery .
  • the top cover assembly 120 is covered on the top of the side wall of the casing 110 and sealed with the side wall, and the liquid injection hole 1221 is provided in the top cover assembly 120 to make the liquid injection hole 1221 at least partially overlaps with the cavity 230 of the winding core 20; a part of the welding equipment can extend into the cavity 230 of the winding core 20 from the liquid injection hole 1221, and press the first tab 210, so that the first tab 210 Welded together with the bottom wall 111 of the housing, that is, the welding marks of the first tab 210 and the bottom wall 111 are located in the overlapping portion of the bottom wall 111 with the cavity 230 and the liquid injection hole 1221 .
  • the top cover assembly 120 has Not only can the top surface of the winding core 20 be protected, but also the winding core 20 can be compressed in the casing 110 to prevent the winding core 20 from shaking, thereby effectively preventing the welding equipment from accidentally damaging the winding core 20 during the welding process. This is beneficial to ensure that the quality and performance of the button battery meet the requirements, and at the same time, it is beneficial to improve the yield rate and production efficiency of the button battery.
  • step S610 include but are not limited to the following three:
  • the first possible implementation is that the welding equipment is resistance welding equipment, and the welding needle of the resistance welding equipment can pass through the liquid injection hole 1221 and the cavity 230 of the winding core 20 to press and weld the first tab 210 on the On the bottom wall 111 of the housing 110, the reliability can be ensured. Then, the energy of the welding device is transmitted to the surface of the first tab 210 through the welding needle, so as to weld the first tab 210 and the bottom wall 111 of the housing together. After the welding is completed, the surface of the first tab can form spot welding marks, the number of spot welding marks is 1 to 3, and the diameter of the spot welding marks is between 0.5mm and 2mm; at the same time, the outer surface of the shell No solder marks, keep smooth surface.
  • the welding needle of the resistance welding device can pass through the liquid injection hole 1221 and the cavity 230 of the winding core 20 to press the first tab 210 and the bottom wall 111 of the casing, so as to ensure the first tab 210 and the bottom of the casing
  • the reliability of the welding between the walls 111 avoids that the first tab 210 and the bottom wall 111 of the casing are not tightly fitted and cause virtual welding, thereby helping to ensure the quality and performance of the button battery.
  • the welding equipment includes a laser welding equipment and a hollow tube 30, and the hollow tube 30 can pass through the liquid injection hole 1221 and the cavity 230 of the winding core 20 to press the first tab 210 against the shell. on the bottom wall 111 of the body 110; the laser light emitted by the laser welding equipment can pass through the inner cavity 310 of the hollow tube 30 and irradiate on the first tab 210 to weld the first tab 210 and the bottom wall 111 of the casing together .
  • the surface of the first tab can form spot welding marks, the contour of the spot welding marks is circular, the number of spot welding marks is greater than or equal to 2, and the diameter of the spot welding marks is greater than or equal to 50 ⁇ m; at the same time,
  • the outer surface of the housing has no solder marks and remains smooth.
  • the hollow tube 30 pierced through the liquid injection hole 1221 and the cavity 230 can, on the one hand, be used to press the first tab 210 against the bottom wall 111 of the housing 110 to prevent the first tab 210 from interacting with the housing 110 .
  • the bottom wall 111 of the body is not closely attached enough to cause virtual welding, thereby affecting the quality and performance of the button battery;
  • the core 20 is accidentally damaged by the laser, and the laser can be prevented from being irradiated to other positions outside the welding area.
  • the welding equipment includes a laser welding equipment and a welding auxiliary, and the welding auxiliary can pass through the liquid injection hole 1221 and the cavity 230 of the winding core 20 to press the first tab 210 against the shell.
  • the laser welding equipment can weld from the bottom of the casing 110 to weld the bottom wall 111 of the casing 110 and the first tab 210 together.
  • the surface of the bottom wall of the shell can form spot welding marks, the contour of the spot welding marks is circular, the number of spot welding marks is greater than or equal to 2, and the diameter of the spot welding marks is greater than or equal to 50 ⁇ m; at the same time,
  • the surface of the first tab has no solder marks and remains smooth.
  • the auxiliary welding piece passing through the liquid injection hole 1221 and the cavity 230 can be used to press the first tab 210 against the bottom wall 111 of the housing 110 to prevent the first tab 210 from being connected to the housing.
  • the bottom wall 111 of the battery is not closely attached, which leads to virtual welding, thereby affecting the quality and performance of the button battery; on the other hand, when the laser welding equipment welds from the outside of the casing 110, it can further prevent the laser welding equipment from accidentally damaging the winding core 20. .
  • the laser directly irradiates the position where the first tab 210 and the bottom wall 111 of 110 fit from above the liquid injection hole 1221 or from below the bottom wall 111 to weld the first tab 210 and the bottom wall 111 together.
  • This embodiment provides an electronic product including a button battery.
  • the button battery in this embodiment has the same structure as the 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 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)
  • Filling, Topping-Up Batteries (AREA)
  • Secondary Cells (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；卷芯包括第一极耳和第二极耳，第一极耳与壳体的底壁焊接连接，第二极耳与顶盖连接；顶盖设置有注液孔，注液孔与卷芯的空腔至少部分重叠；第一极耳和底壁的焊印位于底壁与空腔及注液孔相重叠的部分内。本发明能够保证扣式电池的质量和性能满足要求，并且有利于提升扣式电池的良品率。

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202010771326.X、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。随着扣式电池的需求量越来越大，扣式电池的加工制造过程也受到了越来越多的关注。
然而，在现有扣式电池的加工制造过程中，极耳与壳体之间在进行焊接时，很容易误伤卷芯，导致扣式电池的质量和性能不合格，从而降低了扣式电池的良品率。
发明内容
本发明提供一种扣式电池及其制备方法，本发明的扣式电池的极耳与壳体之间在进行焊接时，不易误伤到卷芯，从而能够保证扣式电池的质量和性能满足要求，进而有利于提升扣式电池的良品率。
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的其中一个设置有往所述底壁方向延伸的第一极耳，所述正极片和负极片的另外一个设置有往所述底壁相反方向延伸的第二极耳，所述第一极耳与所述壳体的底壁焊接，所述第二极耳与所述顶盖组件的内侧焊接；
所述顶盖组件设置有注液孔，所述注液孔与所述卷芯的空腔至少部分重叠；所述第一极耳和所述底壁的焊印位于所述底壁与所述空腔及所述注液孔相重叠的部分内。
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，卷芯包括征集盘、负极片、第一极耳和第二极耳，第一极耳与壳体的底壁焊接连接，第二极耳与顶盖组件连接，从而使卷芯能够通过壳体和顶盖组件向外输送电能或者接收外界输入的电能。通过在顶盖组件上设置注液孔，并使注液孔与卷芯的空腔至少部分重叠，同时，通过设置第一极耳和壳体底壁的焊接区域与卷芯的空腔至少部分重叠，从而使扣式电池的第一极耳和壳体底壁的焊接区域能够通过注液孔和卷芯的空腔显露于视野中，以便于在扣式电池的加工制造过程中，焊接设备能够直接穿过顶盖组件的注液孔和卷芯的空腔，将第一极耳和壳体的底壁焊接在一起，也即，第一极耳和底壁的焊印位于底壁与空腔及注液孔相重叠的部分内。
相比于现有技术中在盖合顶盖之前，从上至下将第一极耳和壳体的底壁进行焊接的方式，本发明的扣式电池在顶盖组件盖合于壳体之后，使焊接设备穿过顶盖组件的注液孔和卷芯的空腔对第一极耳和壳体底壁进行焊接，此时，顶盖组件的存在能够对卷芯起到一定的保护作用，有利于避免焊接设备在焊接的过程中误伤卷芯，从而有利于保证扣式电池的质量和性能满足要求，进而有利于提升扣式电池的良品率。
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所述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，所述第一极耳背离所述壳体底壁的焊接区域具有焊印，所述壳体底壁背离所述第一极耳的的焊接区域为光滑面。
如上所述的扣式电池，可选的，所述壳体底壁背离所述第一极耳的焊接区域具有焊印，所述第一极耳背离所述壳体底壁的焊接区域为光滑面。
如上所述的扣式电池，可选的，所述壳体的底壁和所述顶盖组件共同将所述卷芯夹紧在所述容置腔内。
如上所述的扣式电池，可选的，所述卷芯的空腔内套设有绝缘空心管，所述绝缘空心管的顶部抵接在所述顶盖上，所述绝缘空心管的底部抵接在所述第一极耳上；所述注液孔与所述绝缘空心管的顶部开口至少部分重叠。
如上所述的扣式电池，可选的，所述绝缘空心管为橡胶空心管；和/或，所述绝缘空心管的管壁设置有通孔。
如上所述的扣式电池，可选的，所述绝缘空心管、所述注液孔以及所述卷芯的空腔同轴设置，且所述绝缘空心管的内径大于所述注液孔的直径。
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；
所述上盖的外缘与所述侧围壁焊接，所述上盖的内缘与所述顶盖的外缘搭接在一起，且所述上盖的内缘与所述顶盖的外缘之间夹设有绝缘密封件；
所述第二极耳与所述顶盖的内侧焊接，所述注液孔位于所述顶盖上。
如上所述的扣式电池，可选的，所述上盖与所述顶盖搭接的接缝处涂覆有密封胶。
如上所述的扣式电池，可选的，所述壳体的底壁向下凸出形成凸面。
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，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，所述顶盖组件设有绝缘密封件；
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的其中一个设置有第一极耳，所述正极片和负极片的另外一个设置有第二极耳，所述第二极耳与所述第一极耳分别往相反的方向延伸；
将所述卷芯的第二极耳焊接于顶盖组件的内侧；
将卷芯放置于壳体内，所述卷芯的第一极耳往壳体的底壁方向延伸并与所述底壁接触；
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，所述顶盖组件设有注液孔，所述注液孔与所述卷芯的空腔至少部分重叠；
通过焊接设备将所述第一极耳与所述壳体的底壁焊接在一起，其中，所述焊接设备发出的能量或者所述焊接设备的辅助工具穿过所述注液孔和所述 卷芯的空腔。
如上所述的一种扣式电池的制备方法，可选的，所述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是激光焊接密封。
本发明的扣式电池的制备方法通过将顶盖组件盖合在壳体的侧围壁的顶端并与侧围壁密封，同时在顶盖组件设置注液孔，使注液孔与卷芯的空腔至少部分重叠；并且通过焊接设备将第一极耳与壳体的底壁焊接在一起，其中，焊接设备发出的能量或者焊接设备的辅助工具穿过注液孔和卷芯的空腔。相比于现有技术中在盖合顶盖之前，从上至下将第一极耳和壳体的底壁进行焊接的方式，本发明的焊接方式中，一方面，顶盖组件的存在能够对卷芯起到一定的保护作用，避免了焊接设备在焊接的过程中误伤卷芯，从而有利于保证扣式电池的质量和性能满足要求，进而有利于提升扣式电池的良品率。
如上所述的扣式电池的制备方法，可选的，所述焊接设备为电阻焊接设备，所述电阻焊接设备的焊针穿过所述注液孔和所述卷芯的空腔，将所述第一极耳压紧并焊接在所述壳体的底壁上。
当焊接设备为电阻焊接设备时，其焊针能够穿过注液孔和卷芯的空腔压紧第一极耳和壳体底壁，从而能够保证第一极耳和壳体底壁之间焊接的可靠性，避免了第一极耳和壳体底壁之间贴合不紧密而导致虚焊，进而有利于保证扣式电池的质量和性能。
如上所述的扣式电池的制备方法，可选的，所述焊接设备包括激光焊接设备和空心管，所述空心管穿过所述注液孔和所述卷芯的空腔，将所述第一极耳压紧在所述壳体的底壁上；所述激光焊接设备发出的激光穿过所述空心管的内腔，照射到所述第一极耳上，以将所述第一极耳和所述壳体底壁焊接在一起。
如上所述的扣式电池的制备方法，可选的，所述焊接设备包括激光焊接设备和焊接辅助件，所述焊接辅助件穿过所述注液孔和所述卷芯的空腔，将所述第一极耳压紧在所述壳体的底壁上；所述激光焊接设备从所述壳体的底部进行焊接，以将所述壳体的底壁和所述第一极耳焊接在一起。
当焊接设备为激光焊接设备时，空心管或者焊接辅助件能够穿过注液孔和卷芯的空腔压紧第一极耳和壳体底壁，从而能够保证第一极耳和壳体底壁之间焊接的可靠性，避免了第一极耳和壳体底壁之间贴合不紧密而导致虚焊，进而有利于保证扣式电池的质量和性能。
当激光焊接设备发出的激光直接穿过注液孔和卷芯的空腔照射到第一极耳上的方式，相比于现有技术中在盖合顶盖之前，从上至下将第一极耳和壳体的底壁进行焊接的方式，具有如下优点：
一方面，顶盖组件的存在能够对卷芯起到一定的保护作用，避免了焊接设备在焊接的过程中误伤卷芯，从而有利于保证扣式电池的质量和性能满足要求，进而有利于提升扣式电池的良品率；另一方面，焊接过程方便快捷，有利于提升扣式电池的加工效率。
第四方面，本发明提供一种电子产品，包括如上所述的扣式电池。
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，卷芯包括第一极耳和第二极耳，第一极耳与壳体的底壁焊接连接，第二极耳与顶盖连接，从而使卷芯能够通过壳体和顶盖组件向外输送电能或者接收外界输入的电能。通过在顶盖组件上设置注液孔，并使注液孔与卷芯的空腔至少部分重叠，同时，通过设置第一极耳和壳体底壁的焊接区域与卷芯的空腔至少部分重叠，从而使扣式电池的第一极耳和壳体底壁的焊接区域能够通过注液孔和卷芯的空腔显露于视野中，以便于在扣式电池的加工制造过程中，焊接设备能够直接穿过顶盖组件的注液孔和卷芯的空腔，将第一极耳和壳体的底壁焊接在一起，也即，第一极耳和底壁的焊印位于底壁与空腔及注液孔相重叠的部分内。
相比于现有技术中在安装顶盖之前，从上至下将第一极耳和壳体的底壁进行焊接的方式，本发明的扣式电池在安装顶盖组件之后，使焊接设备的一部分穿过顶盖组件的注液孔和卷芯的空腔将第一极耳和壳体底壁压紧，然后该焊接设备的能量再从注液孔和空腔传递给第一极耳进行焊接，此时，顶盖组件的存在能够对卷芯起到一定的保护作用，有利于避免焊接设备在焊接的过程中误伤卷芯，从而有利于保证扣式电池的质量和性能满足要求，进而有利于提升扣式电池的良品率。
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结构示意图；
图2为本发明实施例一提供的扣式电池的剖视图一；
图3为本发明实施例一提供的扣式电池的剖视图二；
图4为本发明实施例二提供的第二极耳与顶盖焊接并放入壳体后的结构示意图；
图5为本发明实施例二提供的卷芯装入壳体的过程示意图；
图6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；
图7为本发明实施例二提供的空心管穿过注液孔和卷芯空腔的剖视图。
附图标记说明：
10-外壳；
110-壳体；
111-底壁；
120-顶盖组件；
121-上盖；
122-顶盖；
1221-注液孔；
123-绝缘密封件；
20-卷芯；
210-第一极耳；
220-第二极耳；
230-空腔；
240-绝缘空心管；
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，并且在顶盖的中心设有注液孔，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，在具体操作时是首先将卷芯放入壳体中，然后利用焊接设备从上至下将极耳与壳体进行焊接，在焊接的过程中，由于卷芯的顶部没有任何保护，当卷芯发生晃动时，焊接设备很容易对卷芯造成误伤，从而会导致扣式电池的质量和性能不合格，降低了扣式电池的良品率，同时降低了扣式电池的生产效率。
为了解决上述技术问题，本发明提供一种扣式电池，该扣式电池通过在顶盖组件上设置注液孔，并使注液孔与卷芯的空腔至少部分重叠，同时，通过设置第一极耳和壳体底壁的焊接区域与卷芯的空腔至少部分重叠，从而使扣式电池的第一极耳和壳体底壁的焊接区域能够通过注液孔和卷芯的空腔显露于视野中，以便于使焊接设备能够直接穿过顶盖的注液孔和卷芯的空腔， 将第一极耳和壳体的底壁焊接在一起，也即，第一极耳和底壁的焊印位于底壁与空腔及注液孔相重叠的部分内。
而且，顶盖组件能够对卷芯起到一定的保护作用，以避免焊接设备在焊接的过程中误伤卷芯，从而能够保证扣式电池的质量和性能满足要求，有利于提升扣式电池的良品率，同时有利于提升扣式电池的生产效率。
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结构示意图；图2为本发明实施例一提供的扣式电池的剖视图一；图3为本发明实施例一提供的扣式电池的剖视图二。
参照图1至图3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包括壳体110和顶盖组件120，壳体110和顶盖组件120共同围合成用于容置卷芯20的容置腔。
其中，壳体110包括：底壁111以及沿底壁111的外边缘设置并往上延伸的侧围壁。壳体110的底壁111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。
顶盖组件120包括上盖121和顶盖122，上盖121自侧围壁的顶端往壳体110的中轴线方向延伸，在上盖121的中心设有环绕壳体110中轴线的中心孔，顶盖122盖设在中心孔并与上盖121密封。具体的，上盖121的外缘可以与壳体110焊接连接，上盖121的内缘与顶盖122的外缘搭接在一起，并且上盖121的内缘与顶盖122的外缘之间夹设有绝缘密封件123。
进一步的，上盖121与顶盖122搭接的接缝处可以涂覆密封胶，从而进一步保证顶盖组件120的密封性。
基于上述可知，外壳10包括通过绝缘密封件123绝缘连接的两部分，一部分为壳体110和上盖121，另一部分为顶盖122。当然，在另一些情况下， 也可以是壳体110为一部分，上盖121和顶盖122为另一部分。
继续参考图1至图3，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；正极片上焊接有正极耳，负极片上焊接有负极耳；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。卷芯20的正极耳和负极耳分别与外壳的相互绝缘的两部分连接并导通，以使卷芯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。
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与壳体110的底壁111焊接连接，第二极耳220与顶盖组件120中与壳体110电极性相反的顶盖112电连接。
示例性的，当上盖121与顶盖122的电极性相反时，第二极耳220可以与顶盖组件120中的顶盖122焊接连接；当上盖121与顶盖122的电极性相同时，第二极耳220可以与顶盖122或上盖121的任意一个焊接。当然，第二极耳220也可以与顶盖122或者上盖121通过其他方式连接，只要能够保证连接后的导电性能即可。
进一步的，顶盖122上设置有注液孔1221，注液孔1221与卷芯20的空腔230至少部分重叠；第一极耳210和壳体底壁111的焊接区域与卷芯20的空腔230至少部分重叠，以使扣式电池的第一极耳210和壳体底壁111的焊接区域能够通过注液孔1221和卷芯20的空腔230显露于视野中。
示例性地，在组装扣式电池时，首先将卷芯20放入壳体110中，使第一极耳210与壳体110的底壁111贴合，并将第二极耳220与顶盖组件120的内侧焊接；然后将贴有绝缘密封胶圈的顶盖组件120盖设在壳体110的侧围壁的顶端，并与侧围壁焊接在一起，从而实现顶盖组件120与壳体110的密封连接。接下来，使焊接设备的一部分穿过注液孔1221和卷芯20的空腔230，以便将第一极耳210压紧于壳体110的底壁111，然后焊接设备的主要工作部分产生足以将第一极耳210和底壁111贴合表面熔化的能量，从而将第一极耳210和壳体110的底壁111焊接在一起。顶盖组件120能够保护卷芯20的顶部在焊接的过程不会被焊接设备误伤。
可选地，从壳体110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2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2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110和顶盖组件120，壳体110和顶盖组件120共同围合成用于容置卷芯20的容置腔，卷芯20包括第一极耳210和第二极耳220，第一极耳210与壳体110的底壁111焊接连接，第二极耳220与顶盖组件120连接，从而使卷芯20能够通过壳体110和顶盖组件120向外输送电能或者接收外界输入的电能。通过在顶盖122上设置注液孔1221，并使注液孔1221与卷芯20的空腔230至少部分重叠，同时，通过设置第一极耳210和壳体底壁111的焊接区域与卷芯20的空腔230至少部分重叠，从而使扣式电池的第一极耳210和壳体底壁111的焊接区域能够通过注液孔1221和卷芯20的空腔230显露于视野中，以便于在扣式电池的加工制造过程中，焊接设备能够直接穿过顶盖122的注液孔1221和卷芯20的空腔230，将第一极耳210和壳体110的底壁111焊接在一起，也即，第一极耳210和底壁111的焊印位于底壁111与空腔230及注液孔1221相重叠的部分内。
相比于现有技术中在盖合顶盖之前，从上至下将第一极耳和壳体的底壁进行焊接的方式，本实施例的扣式电池在顶盖组件120盖合之后，使焊接设备穿过顶盖122的注液孔1221和卷芯20的空腔230对第一极耳210和壳体底壁111进行焊接，此时，顶盖组件120的存在能够对卷芯20起到一定的保护作用，有利于避免焊接设备在焊接的过程中误伤卷芯20，从而有利于保证扣式电池的质量和性能满足要求，进而有利于提升扣式电池的良品率。
在一种实现方式中，第一极耳210背离壳体底壁111的焊接区域具有焊印，壳体底壁111背离第一极耳210的焊接区域为光滑面。
具体实现时，焊接设备可以从扣式电池的顶部向下将第一极耳210和壳体110的底壁111焊接在一起，示例性的，焊接设备可以为电阻焊接设备，电阻焊接设备的焊针可以穿过注液孔和卷芯的空腔与第一极耳抵接，以将第一极耳焊接在壳体的底壁上；或者，焊接设备也可以为激光焊接设备，激光焊接设备发出的激光可以直接穿过注液孔和卷芯的空腔照射在第一极耳上，以将第一极耳焊接在壳体的底壁上。
焊接设备从扣式电池的顶部向下将第一极耳210和壳体110的底壁111焊接在一起时，焊印形成在第一极耳210背离壳体底壁111的焊接区域，而壳体底壁111背离第一极耳210的焊接区域为光滑面，即，焊印仅能够从壳体110内部观察到，而焊印并未延伸至壳体底壁111背离第一极耳210的一面，即壳体底壁111的外表面没有焊印，因此，壳体底壁111的焊接区域的外表面仍然保持壳体底壁111的外表面在焊接前的形态，即光滑面的状态。从而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，以保证扣式电池与电子产品之间的电连接效果，从而有利于提升扣式电池与电子产品之间的能量传递效率。
在另一种实现方式中，壳体底壁111背离第一极耳210的焊接区域具有焊印，第一极耳210背离壳体底壁111的焊接区域为光滑面。
具体实现时，焊接设备可以从扣式电池的底部向上将壳体110的底壁111和第一极耳210焊接在一起，示例性的，焊接设备可以为激光焊接设备，激光焊接设备可以包括辅助焊接件，辅助焊接件可以穿过注液孔和卷芯的空腔与第一极耳抵接，以将第一极耳压紧在壳体的底壁上，激光焊接设备发出的激光可以从扣式电池的底部向上照射在壳体的外表面上，以将壳体的底壁和第一极耳焊接在一起。
焊接设备从扣式电池的底部向上将壳体110的底壁111和第一极耳210焊接在一起时，焊印形成在壳体底壁111背离第一极耳210的焊接区域，而第一极耳210背离壳体底壁111的焊接区域为光滑面，即，焊印仅能够从壳体110外表面观察到，而焊印并未延伸至第一极耳210背离壳体底壁111的一面，即第一极耳210的表面没有焊印，因此，第一极耳210的焊接区域的表面仍然保持第一极耳210的表面在焊接前的形态，即光滑面的状态。从而能够避免极耳上的焊印对卷芯产生不利影响，进而有利于提升扣式电池的质量和安全性能。
进一步的，壳体110的底壁111和顶盖组件120共同将卷芯20夹紧在容置腔内，以防止卷芯20在焊接的过程中晃动，从而能够进一步避免焊接设备误伤卷芯，进而能够保证扣式电池的质量和性能满足要求，有利于提升扣式电池的良品率，同时，有利于提高扣式电池的生产效率。
参照图3所示，卷芯20的空腔230内套设有绝缘空心管240，绝缘空心管240的顶部抵接顶盖组件120，绝缘空心管240的底部抵接第一极耳210； 并且注液孔1221与绝缘空心管240的顶部开口至少部分重叠。从而使扣式电池的第一极耳210和壳体底壁111的焊接区域能够通过注液孔1221和绝缘空心管240显露于视野中，以便于在扣式电池的加工制造过程中，焊接设备能够直接穿过顶盖组件120的注液孔1221和绝缘空心管240，将第一极耳210和壳体110的底壁111焊接在一起。同时，绝缘空心管240能够对卷芯20的空腔230的内壁形成保护，避免焊接设备误伤卷芯空腔230的内壁。
示例性的，绝缘空心管240可以为橡胶空心管，橡胶空心管具有绝缘性能，从而能够避免扣式电池内部短路；当然，绝缘空心管240也可以为其他绝缘材质，只要能够满足本实施例的要求即可，此处不再赘述。
进一步的，绝缘空心管240的管壁设置有通孔，通孔可以有多个，从而能够保证注入扣式电池内部的电解液能够充分的浸润卷芯。
参照图3所示，在一种实现方式中，绝缘空心管240、注液孔1221以及卷芯20的空腔230可以同轴设置，并且，绝缘空心管240的内径大于注液孔1221的直径，以使绝缘空心管240的顶部抵接在注液孔1221周围的顶盖上。一方面，能够使注液孔1221和绝缘空心管240能够充分的将位于绝缘空心管240底部第一极耳210显露在视野中，以便于后续对第一极耳210和壳体底壁111进行焊接；另一方面，注液孔1221完全位于绝缘空心管240的内部，即，绝缘空心管240将注液孔1221与卷芯空腔230的内壁隔离开，从而能够避免用封口钉封闭注液孔1221的过程中碰伤卷芯空腔230的内壁。
在其他实现方式中，绝缘空心管240、注液孔1221以及卷芯20的空腔230也可以根据实际需要设置其中任意两者同轴，或者，设置三者均不同轴，只要能够满足本实施例的要求即可，此处不再赘述。
实施例二
图4为本发明实施例二提供的第二极耳与顶盖焊接并将其放入壳体后的结构示意图；图5为本发明实施例二提供的将卷芯装入壳体的过程示意图；图6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；图7为本发明实施例二提供的空心管穿过注液孔和卷芯空腔的剖视图。
参照图4至图7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10。如图3所示，外壳10包括壳体110和顶盖组件120， 其中，壳体110包括底壁111以及沿底壁111的外边缘设置并往上延伸的侧围壁，顶盖组件120则设有绝缘密封件。
S200：提供卷芯20。如图3所示，卷芯20包括正极片和负极片，在卷芯20的中心形成有空腔230，并且正极片和负极片的其中一个设置有第一极耳210，正极片和负极片的其中一个设置有第二极耳220，第二极耳220与第一极耳210分别往相反的方向延伸。其中，第一极耳210可以为正极耳，第二极耳220为负极耳；或者，第一极耳210可以为负极耳，第二极耳220为正极耳。
S300：将卷芯20的第二极耳220焊接于顶盖组件120的内侧，参照图4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220焊接于顶盖组件120上，从而一方面有利于避免顶盖组件120发生形变，另一方面，可以避免在顶盖组件120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220焊接于顶盖组件120上，此处不再赘述。
S400：将卷芯20放置于壳体110内，参照图4。卷芯20的第一极耳210往壳体110的底壁111方向延伸并与底壁111接触。具体的，卷芯20的外径可以比壳体110的内径小0.2mm至0.4mm，一方面，便于将卷芯20放入壳体110中；另一方面，给卷芯20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。
需要说明的是，也可以如图5所示的先将卷芯20放置到壳体110内，然后再如图4所示的将第二极耳220焊接到顶盖组件120的内侧。
可选地，从壳体110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2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：将顶盖组件120盖设于壳体110的侧围壁的顶端并与侧围壁密封，顶盖组件120设有注液孔1221，注液孔1221与卷芯20的空腔230至少部分重叠，参照图6所示。示意性地，当顶盖组件120中的上盖121与顶盖122的电极性相反时，顶盖组件120中的上盖121可以与壳体110采用焊接的方式进行密封，二者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；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。
S610：通过焊接设备将第一极耳210与壳体110的底壁111焊接在一起，其中，焊接设备发出的能量和/或该焊接设备的辅助工具穿过注液孔1221和卷芯20的空腔230。
本实施例的扣式电池的制备方法通过将顶盖组件120盖设在壳体110的侧围壁顶端并与侧围壁密封，同时在顶盖组件120设置注液孔1221，使注液孔1221与卷芯20的空腔230至少部分重叠；焊接设备的一部分能够从注液孔1221伸入卷芯20的空腔230，并压紧第一极耳210，以便于将第一极耳210与壳体底壁111焊接在一起，也即，第一极耳210和底壁111的焊印位于底壁111与空腔230及注液孔1221相重叠的部分内。
相比于现有技术中在盖合顶盖之前，从上至下将第一极耳和壳体的底壁进行焊接的方式，本实施例的焊接方式中，一方面，顶盖组件120的存在不仅能够对卷芯20的顶面形成保护，而且能够将卷芯20压紧在壳体110内，防止卷芯20晃动，从而有效的避免了焊接设备在焊接的过程中误伤卷芯20，进而有利于保证扣式电池的质量和性能满足要求，同时有利于提升扣式电池的良品率和生产效率。
其中，步骤S610的实现方式包括但不限于以下三种：
第一种可能的实现方式为，焊接设备为电阻焊接设备，电阻焊接设备的焊针能够穿过注液孔1221和卷芯20的空腔230，以将第一极耳210压紧并焊接在壳体110的底壁111上，从而能够保证的可靠性。随后，焊接设备的能量通过焊针传到第一极耳210的表面，以便将第一极耳210和壳体底壁111焊接在一起。焊接完成后，第一极耳的表面可以形成点状焊印，点状焊印的数量为1至3个，点状焊印的直径在0.5mm至2mm之间；同时，壳体的外表面没有焊印，保持光滑面。
由此，电阻焊接设备的焊针能够穿过注液孔1221和卷芯20的空腔230压紧第一极耳210和壳体底壁111，从而能够保证第一极耳210和壳体底壁111之间焊接的可靠性，避免了第一极耳210和壳体底壁111之间贴合不紧密而导致虚焊，进而有利于保证扣式电池的质量和性能。
第二种可能的实现方式为，焊接设备包括激光焊接设备和空心管30，空心管30能够穿过注液孔1221和卷芯20的空腔230，以将第一极耳210压紧 在壳体110的底壁111上；激光焊接设备发出的激光能够穿过空心管30的内腔310，照射到第一极耳210上，以将第一极耳210和壳体底壁111焊接在一起。焊接完成后，第一极耳的表面可以形成点状焊印，点状焊印的轮廓呈圆形，点状焊印的数量大于等于2个，点状焊印的直径大于等于50μm；同时，壳体的外表面没有焊印，保持光滑面。
穿设在注液孔1221和空腔230内的空心管30，一方面，能够用于将第一极耳210压紧在壳体110的底壁111上，以防止第一极耳210与壳体的底壁111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。
第三种可能的实现方式为，焊接设备包括激光焊接设备和焊接辅助件，焊接辅助件能够穿过注液孔1221和卷芯20的空腔230，以将第一极耳210压紧在壳体110的底壁111上；激光焊接设备能够从壳体110的底部进行焊接，以将壳体110的底壁111和第一极耳210焊接在一起。焊接完成后，壳体底壁的表面可以形成点状焊印，点状焊印的轮廓呈圆形，点状焊印的数量大于等于2个，点状焊印的直径大于等于50μm；同时，第一极耳的表面没有焊印，保持光滑面。
穿设在注液孔1221和空腔230内的辅助焊接件，一方面能够用于将第一极耳210压紧在壳体110的底壁111上，以防止第一极耳210与壳体的底壁111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，当激光焊接设备从壳体110外部进行焊接能够进一步避免激光焊接设备误伤卷芯20。
需要指出的是，某些时候也可以不使用空心管或者辅助焊接件，而是直接用激光焊接设备进行焊接。例如，激光直接从注液孔1221的上方或者从底壁111的下方照射第一极耳210与110的底壁111贴合的位置，以将第一极耳210与底壁111焊接在一起。
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 (13)

  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的其中一个设置有往所述底壁方向延伸的第一极耳，所述正极片和负极片的另外一个设置有往所述底壁相反方向延伸的第二极耳，所述第一极耳与所述壳体的底壁焊接，所述第二极耳与所述顶盖组件的内侧焊接；
    所述顶盖组件设置有注液孔，所述注液孔与所述卷芯的空腔至少部分重叠；所述第一极耳和所述底壁的焊印位于所述底壁与所述空腔及所述注液孔相重叠的部分内。
  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所述卷芯的端点到所述焊印的极耳的长度。
  3. 根据权利要求1所述的扣式电池，其中，所述第一极耳背离所述壳体底壁的焊接区域具有焊印，所述焊印并未延伸至所述壳体底壁背离所述第一极耳的一面；或，
    所述壳体底壁背离所述第一极耳的焊接区域具有焊印，所述焊印并未延伸至所述第一极耳背离所述壳体底壁的一面。
  4. 根据权利要求1所述的扣式电池，其中，所述卷芯的空腔内套设有绝缘空心管，所述绝缘空心管的顶部抵接在所述顶盖上，所述绝缘空心管的底部抵接在所述第一极耳上；
    所述注液孔与所述绝缘空心管的顶部开口至少部分重叠。
  5. 根据权利要求4所述的扣式电池，其中，所述绝缘空心管为橡胶空心管；和/或，
    所述绝缘空心管的管壁设置有通孔。
  6. 根据权利要求4所述的扣式电池，其中，所述绝缘空心管、所述注液孔以及所述卷芯的空腔同轴设置，且所述绝缘空心管的内径大于所述注液孔的直径。
  7. 根据权利要求1-6任一项所述的扣式电池，其中，所述顶盖组件包括上盖和顶盖；
    所述上盖的外缘与所述侧围壁焊接，所述上盖的内缘与所述顶盖的外缘搭接在一起，且所述上盖的内缘与所述顶盖的外缘之间夹设有绝缘密封件；
    所述第二极耳与所述顶盖的内侧焊接，所述注液孔位于所述顶盖上。
  8. 根据权利要求7所述的扣式电池，其中，所述上盖与所述顶盖搭接的接缝处涂覆有密封胶。
  9. 根据权利要求1-6任一项所述的扣式电池，其中，所述壳体的底壁向下凸出形成凸面。
  10. 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，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，所述顶盖组件设有绝缘密封件；
    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的其中一个设置有第一极耳，所述正极片和负极片的另外一个设置有第二极耳，所述第二极耳与所述第一极耳分别往相反的方向延伸；
    将所述卷芯的第二极耳焊接于顶盖组件的内侧；
    将卷芯放置于壳体内，所述卷芯的第一极耳往壳体的底壁方向延伸并与所述底壁接触；
    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，所述顶盖组件设有注液孔，所述注液孔与所述卷芯的空腔至少部分重叠；
    通过焊接设备将所述第一极耳与所述壳体的底壁焊接在一起，其中，所述焊接设备发出的能量或者所述焊接设备的辅助工具穿过所述注液孔和所述卷芯的空腔。
  11. 根据权利要求10所述的扣式电池的制备方法，其中，所述焊接设备为电阻焊接设备，所述电阻焊接设备的焊针穿过所述注液孔和所述卷芯的空腔，将所述第一极耳压紧并焊接在所述壳体的底壁上。
  12. 根据权利要求10所述的扣式电池的制备方法，其中，所述焊接设备包括激光焊接设备和空心管，所述空心管穿过所述注液孔和所述卷芯的空腔，将所述第一极耳压紧在所述壳体的底壁上；
    所述激光焊接设备发出的激光穿过所述空心管的内腔，照射到所述第一极耳上，以将所述第一极耳和所述壳体底壁焊接在一起。
  13. 根据权利要求10所述的扣式电池的制备方法，其中，所述焊接设备包括激光焊接设备和焊接辅助件，所述焊接辅助件穿过所述注液孔和所述卷芯的空腔，将所述第一极耳压紧在所述壳体的底壁上；
    所述激光焊接设备从所述壳体的底部进行焊接，以将所述壳体的底壁和所述第一极耳焊接在一起。
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