WO2022127880A1 - 一种纽扣电池电芯结构及其制造方法和纽扣电池 - Google Patents

一种纽扣电池电芯结构及其制造方法和纽扣电池 Download PDF

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Publication number
WO2022127880A1
WO2022127880A1 PCT/CN2021/138942 CN2021138942W WO2022127880A1 WO 2022127880 A1 WO2022127880 A1 WO 2022127880A1 CN 2021138942 W CN2021138942 W CN 2021138942W WO 2022127880 A1 WO2022127880 A1 WO 2022127880A1
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WIPO (PCT)
Prior art keywords
tab
electrode sheet
adhesive layer
winding core
diaphragm
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Application number
PCT/CN2021/138942
Other languages
English (en)
French (fr)
Inventor
王永旺
曾玉祥
Original Assignee
珠海冠宇电池股份有限公司
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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 EP21905806.2A priority Critical patent/EP4164021A4/en
Publication of WO2022127880A1 publication Critical patent/WO2022127880A1/zh
Priority to US18/149,658 priority patent/US20230141846A1/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
    • 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
    • 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
    • H01M10/05—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
    • H01M50/147—Lids or covers
    • H01M50/148—Lids or covers characterised by their shape
    • H01M50/154—Lid or cover comprising an axial bore for receiving a central current collector
    • 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
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/202—Casings or frames around the primary casing of a single cell or a single battery
    • 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
    • H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
    • H01M50/46—Separators, membranes or diaphragms characterised by their combination with electrodes
    • H01M50/461—Separators, membranes or diaphragms characterised by their combination with electrodes with adhesive layers between electrodes and 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
    • H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
    • H01M50/463—Separators, membranes or diaphragms characterised by their shape
    • H01M50/469—Separators, membranes or diaphragms characterised by their shape tubular or cylindrical
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Definitions

  • the invention relates to the technical field of batteries, in particular to a button battery cell structure and a manufacturing method thereof, and a button battery.
  • Button batteries have the advantages of stable discharge voltage, wide operating temperature range and long storage life, and are widely used in various electronic products.
  • the demand for button batteries for wearable devices continues to increase, such as wireless earphones, sports watches, wristbands, rings, etc., for button batteries.
  • buttons batteries need to improve their safety for long-term use in harsh environments, especially in bumpy environments, but they are limited by the development of industrial manufacturing levels and market demand.
  • the button batteries on the market were mainly primary batteries, and secondary buttons Lithium-ion batteries are basically not sold in the market, and miniaturized electronic products have higher requirements for the space size of battery products. Due to the reduction of battery size and the improvement of size consistency requirements for button batteries, the manufacturing technology has been proposed. A huge challenge, the button battery with steel shell structure can better meet the needs of people.
  • the existing button battery cells are prone to the phenomenon of movement and displacement of the positive electrode and the negative electrode in harsh environments, especially in bumpy environments or in the case of falling, resulting in a short circuit due to contact with the metal shell, affecting the impact of the battery. safety of use.
  • the negative electrode piece is easy to move and displace, so as to avoid short circuit due to contact with the metal shell of the button battery.
  • the invention provides a button battery cell structure and a manufacturing method and a button battery, which are used to at least solve the technical problem of the phenomenon that the positive electrode sheet and the negative electrode sheet are prone to movement and displacement, and avoid the positive electrode sheet and the negative electrode sheet and the shell in the button battery. A short circuit occurs due to contact, which improves the safety of the button battery.
  • the present invention provides a button battery cell structure, comprising a winding core formed by winding a laminated structure and having a hollow inner hole, the winding core is provided with a first tab and a second tabs, the stacked structure includes at least one positive electrode sheet, at least one negative electrode sheet, and a separator separating the at least one positive electrode sheet and the at least one negative electrode sheet, and at least two ends of the winding core are provided with wrapping
  • the separator adhesive layer of the winding core is used to fix the positive electrode sheet and the negative electrode sheet.
  • the diaphragm adhesive layer is provided so that the diaphragm adhesive layer wraps the two ends of the winding core, so that the diaphragm adhesive layer covers the positive electrode sheet and the negative electrode sheet, and the positive electrode sheet or the negative electrode sheet is wrapped in a sealed
  • the movement and displacement of the positive electrode sheet or the negative electrode sheet is limited, and even in the case of severe vibration, such as running and falling, it can ensure that the positive electrode sheet and the negative electrode sheet will not come out of the winding core. , to avoid the short circuit caused by the contact of the positive electrode sheet and or the negative electrode sheet with the battery casing, and improve the use safety of the button battery cell structure.
  • the separator extends outward from both ends of the winding core and forms protruding ends, and the protruding ends are inclined toward the inner hole of the winding core, respectively.
  • the adjacent protruding ends are bonded to each other to form the membrane adhesive layer.
  • the width D of the protruding end is greater than/or equal to the sum of the thickness of the negative electrode sheet, the thickness of the positive electrode sheet and the thickness of the separator.
  • the outer side of the positive electrode sheet/or the negative electrode sheet connected to the first tab is provided with a the diaphragm
  • the diaphragm adhesive layer includes a first diaphragm adhesive layer located inside the first tab, and a second diaphragm adhesive layer located outside the first tab, and the first diaphragm adhesive layer is The adhesive force is greater than the adhesive force of the second membrane adhesive layer.
  • the inner side of the positive electrode sheet/or the negative electrode sheet connected to the first tab is provided with a the diaphragm
  • the diaphragm adhesive layer includes a second diaphragm adhesive layer located inside the first tab, and a first diaphragm adhesive layer located outside the first tab, and the first diaphragm adhesive layer is The adhesive force is greater than the adhesive force of the second membrane adhesive layer.
  • the area of the second diaphragm adhesive layer covering the first tab accounts for 5% to 30% of the area of the first tab.
  • the width A of the diaphragm is 4 mm ⁇ 10 mm; after forming the adhesive layer of the diaphragm, the width A2 of the diaphragm is 3 mm ⁇ 9 mm.
  • the width B of the positive electrode sheet is 2 mm ⁇ 8 mm
  • the width C of the negative electrode sheet is 2.5 mm ⁇ 8.5 mm.
  • the present invention also provides a button battery, which includes the above-mentioned button battery cell structure and a casing, wherein the casing has a accommodating cavity for accommodating the button battery cell structure, and the bent portion of the first tab is located at On at least one end face of the winding core, the bent portion of the first tab contacts the diaphragm adhesive layer, and the bent portion of the first tab is electrically connected to the end face of the housing.
  • the present invention also provides a method for manufacturing a button battery cell structure, which is used for manufacturing the above-mentioned button battery cell structure, including:
  • the winding core comprising a positive electrode sheet, a negative electrode sheet and a separator separating the positive electrode sheet and the negative electrode sheet;
  • Providing a heating plate and heating the heating plate to a preset temperature includes providing an arc-shaped heating plate and a first planar heating plate, and heating the arc-shaped heating plate and the first planar heating plate to the preset temperature.
  • the preset temperature, the preset temperature is 122°C ⁇ 128°C;
  • the heating plate scrapes the membranes at both ends of the winding core from outside to inside, so that the protruding ends of the membranes form inclined protruding ends;
  • the heating plate hot-presses the inclined protruding ends, so that the inclined protruding ends form a membrane adhesive layer that is sequentially bonded and shrunk;
  • the outermost/or innermost diaphragm of the winding core is scraped and pressed to adhere to the diaphragm adhesive layer.
  • the present invention provides a method for manufacturing a button battery cell structure, which is used to manufacture the above-mentioned button battery cell structure, and the manufacturing process is simple.
  • the adhesive layer completely wraps the positive and negative electrodes in a sealed area, which can significantly improve the safety of the button battery in harsh environments, especially in bumpy environments for a long time.
  • the invention provides a method for manufacturing a button battery cell structure.
  • a separator adhesive layer that completely wraps the positive electrode sheet and the negative electrode sheet, the positive electrode sheet and the negative electrode sheet are completely connected to the shell of the button battery. It is isolated to avoid short circuit caused by the positive electrode sheet and the negative electrode sheet coming into contact with the shell of the button battery after moving and shifting.
  • the button battery cell structure and its manufacturing method and the button battery provided by the present invention are convenient for manufacturing the button battery, and the button battery manufactured by using the button battery cell structure provided by the present invention can effectively improve the use safety of the button battery, and can effectively improve the use safety of the button battery. It can still be used normally under the environment without being affected, and the scope of application is large.
  • the embodiments of the present invention provide a button battery cell structure and The manufacturing method and other technical problems that can be solved by the button battery, other technical features included in the technical solution, and the beneficial effects brought by these technical features will be further described in detail in the specific embodiments.
  • FIG. 1 is a structure in which an arc-shaped heating plate is used to squeeze the winding core when the first tab and the second tab are both located on the inner ring of the winding core in the method for manufacturing a button battery cell structure provided by an embodiment of the present invention schematic diagram;
  • Fig. 2 is a method for manufacturing a button battery cell structure provided by an embodiment of the present invention when both the first tab and the second tab are located on the inner ring of the winding core, and a first flat heating plate is used to squeeze the winding core Schematic;
  • Fig. 3 is a method for manufacturing a button battery cell structure provided by an embodiment of the present invention when the first tab and the second tab are both located on the outer ring of the winding core, the first flat heating plate is used to squeeze the winding core Schematic;
  • FIG. 4 is a schematic diagram of a method for manufacturing a button battery cell structure provided by an embodiment of the present invention when the first tab and the second tab are both located on the outer ring of the winding core, and a second flat heating plate is used to hot-press the winding core.
  • Fig. 5 is a method for manufacturing a button battery cell structure provided by an embodiment of the present invention when the first tab and the second tab are both located on the inner ring of the winding core, and a second flat heating plate is used to squeeze the winding core.
  • FIG. 6 is a schematic structural diagram of a cell structure of a button battery provided by an embodiment of the present invention before hot pressing;
  • FIG. 7 is a schematic structural diagram of a cell structure of a button battery according to an embodiment of the present invention.
  • FIG. 8 is a schematic partial structural diagram of a button battery cell structure before scraping the diaphragm according to an embodiment of the present invention
  • FIG. 9 is a schematic diagram of a partial structure of a button battery cell structure provided by an embodiment of the present invention after scraping the diaphragm;
  • FIG. 10 is a schematic partial structural diagram of the cell structure of the button battery provided by the embodiment of the present invention after forming the adhesive layer of the separator;
  • FIG. 11 is a schematic structural diagram of a button battery cell structure installation casing provided by an embodiment of the present invention.
  • FIG. 12 is a flowchart of a method for manufacturing a cell structure of a button battery according to an embodiment of the present invention.
  • button batteries are widely used in many ultra-thin and small electronic products, such as weight scales, electronic watches, wireless earphones, etc.
  • Button batteries have the characteristics of small size and low battery discharge current, which are the life expectancy of many electronic products.
  • the optimal power supply is also conducive to the development of miniaturization of electronic products.
  • the cell structure is the core component of the button battery.
  • the cell structure of the button battery mainly has two preparation processes, one is the lamination process, and the lamination process is to cut the positive electrode sheet, the negative electrode sheet and the diaphragm into the specific production required shape and size, and then stack the positive electrode sheet, the separator and the negative electrode sheet to form the main body of the battery cell; the other is the winding process.
  • the lamination process needs to cut the positive electrode sheet, the negative electrode sheet and the diaphragm into the shape and size required for specific production.
  • the lamination process is more complicated and requires more production time; while the winding process is relatively easy to operate, only need to
  • the positive electrode sheet, the negative electrode sheet and the separator are arranged in a strip-shaped structure with a certain size and regularity, which is relatively simple and convenient, can be completed quickly, and is easy to realize industrial automation. Therefore, the core structure of most button batteries adopts the winding process.
  • the existing button battery is prone to the phenomenon that the positive electrode piece and the negative electrode piece move and displace in harsh environments, especially in bumpy environments or in the case of falling, resulting in short circuit due to contact with the metal shell, affecting the use of safety.
  • the present invention provides a button battery cell structure and a manufacturing method and a button battery, which improve the button battery cell structure and its manufacturing method and the button battery, so as to avoid the button battery from falling in a bumpy environment or falling Under the circumstance that the positive electrode sheet and the negative electrode sheet are moving and displaced, the occurrence of short circuit can be avoided, and the service life and safety of use can be improved.
  • a button battery cell structure includes a winding core 10 formed by winding a laminated structure and having a hollow inner hole 14.
  • the laminated structure includes at least one positive electrode sheet 11 and at least one negative electrode sheet. 12 and the separator 13 separating at least one positive electrode sheet 11 and at least one negative electrode sheet 12, at least both ends of the winding core 10 are provided with a separator bonding layer 132 wrapping the winding winding core 10, and the separator bonding layer 132 is used for
  • the separator adhesive layer 132 enables the positive electrode sheet 11 and the negative electrode sheet 12 to be stably wrapped in a sealed area, so as to prevent the positive electrode sheet 11 from falling and other violent vibrations in the button battery.
  • the negative electrode sheet 12 moves and contacts the casing 50 of the battery, a short circuit occurs, which improves the safety of use.
  • the inner hole 14 is located at the center of the winding core 10 , and the inner hole 14 penetrates through both end surfaces of the winding core 10 .
  • the separators 13 extend outward from both ends of the winding core 10 respectively and form protruding ends 131 , as shown in FIGS.
  • the direction of the inner hole 14 is inclined, and the adjacent protruding ends 131 are bonded to each other to form a diaphragm bonding layer 132 .
  • the two sides of the diaphragm 13 extend outward from the two ends of the winding core 10 respectively, that is, the diaphragm 13 is along the axial direction of the winding core 10 and faces away from the winding from both ends of the winding core 10 . It extends in the direction of winding core 10 .
  • the width of the separator 13 is greater than the width of each positive electrode sheet 11 , and the width of the separator 13 is also greater than the width of each negative electrode sheet 12 , so that the laminated structure is wound along the length direction of the separator 13 to form a coil. After the core 10 is wound, there will be remaining separators 13 at both ends of the winding core 10 , and the remaining separators 13 of the winding core 10 , that is, the protruding ends 131 .
  • the winding core 10 may be a layered structure formed by a positive electrode sheet 11 , a separator 13 , a negative electrode sheet 12 , and another separator 13 , which are sequentially stacked from top to bottom or bottom to top. After that, it is formed through a winding process; the winding core 10 can also be formed by stacking a negative electrode sheet 12, a separator 13, a positive electrode sheet 11, and another separator 13 sequentially from top to bottom or bottom to top. Formed by a winding process.
  • the stacked structure can also be a plurality of negative electrode sheets 12 and a plurality of positive electrode sheets 11 that are alternately stacked in sequence, and each negative electrode sheet 12 and/or each positive electrode sheet 11 are arranged on the upper and lower sides so that each negative electrode sheet 12 A separator 13 completely separated from each positive electrode sheet 11, and the laminated structure is formed into a winding core 10 by a winding process. Even after the winding core 10 is wound, it should be ensured that the negative electrode sheet 12 will not be in contact with the positive electrode sheet 11 to avoid short circuit.
  • the separator 13 is used to prevent the negative electrode sheet 12 from contacting the positive electrode sheet 11 and short-circuiting occurs.
  • the separator 13 needs to ensure that each negative electrode sheet 12 and each positive electrode sheet 11 are completely separated from each other without contacting each other.
  • the separator 13 is not limited to being arranged on each negative electrode
  • the way between the sheet 12 and each positive electrode sheet 11 can also be in a way of being sheathed on each negative electrode sheet 12, or by being sheathed on each positive electrode sheet 11, so that each negative electrode sheet 12 is connected to each positive electrode sheet.
  • the sheets 11 are completely spaced apart.
  • the separators 13 are located on the outside and inside of at least one positive electrode sheet 11 and/or on the outside and inside of at least one negative electrode sheet 12 to completely separate each positive electrode sheet 11 from each negative electrode sheet 12 . That is, the separators 13 are located on the outside and inside of the at least one positive electrode sheet 11 , so that each positive electrode sheet 11 is completely separated from each negative electrode sheet 12 . Alternatively, the separators 13 are located on the outside and inside of the at least one negative electrode tab 12 so that each positive electrode tab 11 is completely separated from each negative electrode tab 12.
  • the winding core 10 is spirally wound, so there are obvious helical turns at both ends of the winding core 10 .
  • the hole 14 is inclined in direction and is bonded to the protruding end 131 of the diaphragm 13 of the adjacent inner ring.
  • the protruding ends 131 of each ring of diaphragms 13 partially overlap with the protruding ends 131 of the diaphragms 13 of the adjacent inner ring. Therefore, in order to ensure that the protruding ends 131 of each ring of separators 13 partially overlap with the protruding ends 131 of the separators 13 of the adjacent inner ring, the width D of the protruding ends 131 needs to satisfy that D is greater than/or equal to the thickness of the positive electrode sheet 11 and the negative electrode sheet 12 and the sum of the thickness of the diaphragm 13 .
  • a first tab 20 and a second tab 30 are respectively provided at both ends of the winding core 10 , and one of the first tab 20 and the second tab 30 is a positive tab , the other of the first tab 20 and the second tab 30 is a negative tab, the positive tab is connected to the positive tab 11 , and the negative tab is connected to the negative tab 12 .
  • the second tab 30 is located on the outer ring of the winding core 10, and the first tab 20 and the second polar One of the tabs 30 is connected to the upper end of the winding core 10 , and the other of the first tab 20 and the second tab 30 is connected to the lower end of the winding core 10 .
  • the first tab 20 is located on the outer ring of the winding core 10, which means that the connection position of the first tab 20 and the positive electrode sheet 11/or the negative electrode sheet 12 to which it is connected is located in the outer ring layer of the winding core 10, and the external It refers to the part of the winding core close to the coin cell battery case 50 .
  • the layer 132 includes a first membrane adhesive layer located inside the first tab 20, and a second membrane adhesive layer located outside the first tab 20, and the adhesive force of the first membrane adhesive layer is greater than that of the second membrane adhesive layer.
  • the bonding force of the junction layer; the outer side of the positive electrode sheet 11/or the negative electrode sheet 12 connected with the second tab 30 is provided with a separator 13; and a second diaphragm adhesive layer located outside the second tab 30 , and the adhesive force of the first diaphragm adhesive layer is greater than the adhesive force of the second diaphragm adhesive layer.
  • the remaining positive electrode sheet 11/or the inner ring of the negative electrode sheet 12 is provided with
  • the protruding ends 131 of the diaphragm 13 are scraped in the direction of the inner hole 14 in the center of the winding core 10, so that the protruding ends 131 of the diaphragm 13 are inclined, and then the inclined protruding ends 131 of the two ends of the winding core 10 are bonded by flat hot pressing. shrink to form a first membrane adhesive layer. And the adhesive force of the first diaphragm adhesive layer is greater than the adhesive force of the second diaphragm adhesive layer.
  • the adhesive force refers to that after the diaphragm adhesive layer 132 is formed, the diaphragm adhesive layer 132 is separated by force, so that the force required to separate the diaphragm adhesive layer 132 represents the adhesive force.
  • the greater the adhesive force the greater the force required to separate the membrane adhesive layers 132.
  • the second tab 30 is located on the inner ring of the winding core 10
  • one of the first tab 20 and the second tab 30 is connected to the upper end of the winding core 10
  • the other of the first tab 20 and the second tab 30 is connected to the lower end of the winding core 10 .
  • the layer 132 includes a second diaphragm adhesive layer located inside the first tab 20 and a first diaphragm adhesive layer located outside the first tab 20, and the adhesive force of the first diaphragm adhesive layer is greater than that of the second diaphragm adhesive layer.
  • the separator adhesive layer 132 includes The second diaphragm adhesive layer located inside the second tab 30 and the first diaphragm adhesive layer located outside the second tab 30, and the adhesive force of the first diaphragm adhesive layer is greater than that of the second diaphragm adhesive layer. adhesion.
  • the heating plate 40 When processing the first separator adhesive layer, it is necessary to use the heating plate 40 to scrape the protruding ends 131 of the separators 13 at both ends of the winding core 10 from the edge of the winding core 10 to the inner hole 14 in the center of the winding core 10 .
  • the other positive electrode sheet 11/or the outer ring of the negative electrode sheet 12 The diaphragm
  • the protruding ends 131 of 13 are scraped in the direction of the inner hole 14 in the center of the winding core 10, so that the protruding ends 131 of the diaphragm 13 are inclined.
  • the first tab 20 is located in the inner circle of the winding core 10, which means that the connection position between the first tab 20 and the positive electrode sheet 11/or the negative electrode sheet 12 to which it is connected is located in the inner ring layer of the winding core 10, and the inner It refers to the part of the winding core close to the inner hole 14 .
  • scraping and pressing are performed on the first tab 20 and the second tab 30 after the hot pressing, so that the first tab 20 and the second tab 30 are on the end face of the diaphragm adhesive layer 132 , for the outermost ring
  • the diaphragm 13 of the outermost ring is scraped and pressed, and the adhesive force between the diaphragm 13 of the outermost ring and the diaphragm 13 of the second outer ring is smaller than the adhesive force between the diaphragms 13 of the other rings.
  • the second tab 30 is located on the inner ring of the winding core 10, and one of the first tab 20 and the second tab 30 is connected At the upper end of the winding core 10 , the other one of the first tab 20 and the second tab 30 is connected to the lower end of the winding core 10 , and the positive electrode 11 and/or the negative electrode 12 connected to the first tab 20 Diaphragm 13 is provided on the outer side of the electrode and on the inner side of the positive electrode sheet 11/or negative electrode sheet 12 connected to the second tab 30; , a first diaphragm adhesive layer located outside the second tab 30, a second diaphragm adhesive layer located outside the first tab 20, and a second diaphragm adhesive layer located inside the second tab 30, and the first The adhesive force of the membrane adhesive layer is greater than the adhesive force of the second membrane adhesive layer.
  • the area of the second diaphragm adhesive layer covering the first tab 20 accounts for 5% to 30% of the area of the first tab 20 ; the area of the second diaphragm adhesive layer covering the second tab 30 accounts for 30% of the area of the second tab 30 . 5% to 30%.
  • the button battery cell structure provided by the present invention is installed into the casing 50 for packaging, the winding core 10 is connected to the metal shell 50 of the button battery through the negative electrode ear, and the winding core 10 is connected to the button battery through the positive lug.
  • a metal casing 50 is connected.
  • the width A of the diaphragm 13 is between 4 mm and 10 mm; after the diaphragm adhesive layer 132 is formed, the width A2 of the diaphragm 13 is 3 mm ⁇ 9mm.
  • the width B of the positive electrode sheet 11 is between 2 mm and 8 mm, and the width C of the negative electrode sheet 12 is between 2.5 mm and 8.5 mm.
  • the diaphragm 13 can be a macroporous oil-based diaphragm of 5+2+2 ⁇ m, and its melting point is 125°C.
  • the base material of the positive electrode sheet 11 can be an aluminum foil with a thickness of 10 ⁇ m, and a coating is applied on the front and back sides of the base material of the positive electrode sheet 11 , and the thickness of the coating layer is 75 ⁇ m.
  • the base material of the negative electrode sheet 12 can be a copper foil with a thickness of 5 ⁇ m, and a coating is applied on the front and back sides of the base material of the negative electrode sheet 12 , and the coating thickness is 85 ⁇ m.
  • the diameter of the winding core 10 is 10 mm and the width is 5.5 mm
  • the width A of the separator 13 is 5.5 mm
  • the width C of the negative electrode sheet 12 is 4 mm
  • the width B of the positive electrode sheet 11 is 3.5 mm.
  • the present invention further provides a button battery, which includes the above-mentioned button battery cell structure, and also includes a housing 50 .
  • the housing 50 has an accommodating cavity 51 for accommodating the button battery cell structure.
  • the housing 50 is provided with The casing cover of the accommodating cavity 51 is sealed, and the casing 50 is used to encapsulate the button battery cell structure therein, and protect the button battery cell structure.
  • One end of the first tab 20 is connected to the positive electrode sheet 11/or the negative electrode sheet 12, and the middle part of the first tab 20 is bent to form a bent portion 21 that is almost parallel to the end face of the winding core 10, and the bent portion 21 is directed toward the first tab.
  • the other end of the tab 20 extends.
  • the bent portion 21 of the first tab 20 is located on at least one end surface of the winding core 10 , the bent portion 21 of the first tab 20 contacts the diaphragm adhesive layer 132 , and the bent portion 21 of the first tab 20 It is electrically connected to the end face of the housing 50 .
  • one side of the bent portion 21 contacts the first diaphragm adhesive layer of the diaphragm adhesive layer 132 , and the other side of the bent portion 21 of the first tab 20 is electrically connected to the end surface of the housing 50 through contact.
  • the protruding end 131 of the diaphragm 13 is loose and low in strength, and cannot be well insulated, so it is necessary to stick insulating tape on the end face of the existing winding core 10 to make the
  • the first tab 20 is insulated from both end surfaces of the winding core 10 .
  • the end face of the winding core 10 has a membrane adhesive layer 132 that wraps the winding core 10.
  • the membrane adhesive layer 132 wraps and tightens the winding core 10, and the membrane adhesive layer 132 insulates the first tab 20 from both end surfaces of the winding core 10, so the first tab 20 can be directly bent to contact the diaphragm adhesive layer 132, no need to use insulating tape, which simplifies the The structure of the button battery.
  • the present invention also provides a method for manufacturing a button battery cell structure, as shown in FIG. 12 , for manufacturing the above-mentioned button battery cell structure, including the following steps:
  • Step S110 providing a winding core 10 , the winding core 10 includes a positive electrode sheet 11 , a negative electrode sheet 12 and a separator 13 separating the positive electrode sheet 11 and the negative electrode sheet 12 .
  • the provided winding coil is provided.
  • Step S120 Provide the first tab 20 and the second tab 30, one of the first tab 20 and the second tab 30 is a positive tab, and the other one of the first tab 20 and the second tab 30 is Negative ear;
  • Step S130 Weld the first tab 20 and the second tab 30 , the positive tabs in the first tab 20 and the second tab 30 are connected to the positive tab 11 , and the tabs in the first tab 20 and the second tab 30 are The negative electrode ear is connected with the negative electrode sheet 12;
  • Step S140 providing a heating plate 40 and heating the heating plate 40 to a preset temperature
  • Step S150 the heating plate 40 scrapes the diaphragms 13 at both ends of the winding core 10 from the outside to the inside, so that the protruding ends 131 of the diaphragms 13 form inclined protruding ends 131 ;
  • Step S160 The heating plate 40 hot-presses the inclined protruding ends 131, so that the inclined protruding ends 131 form the diaphragm adhesive layer 132 that is sequentially bonded and shrunk. junction layer.
  • Step S170 scraping and pressing the first tab 20 and the second tab 30 to press the end surface of the diaphragm adhesive layer 132 ; specifically, scraping and pressing the first tab 20 and the second tab 30 to press the tab on the diaphragm
  • the adhesive layer 132 is on the first membrane adhesive layer.
  • Step S180 Scraping and pressing the diaphragm 13 of the outermost and/or innermost circle of the winding core 10 to adhere to the diaphragm adhesive layer 132. Specifically, the diaphragm 13 of the outermost and/or innermost ring of the winding core 10 is scraped and pressed to bond to the diaphragm adhesive layer 132 to form the second diaphragm adhesive layer.
  • the method for manufacturing a button battery cell structure provided in the present invention has the advantages of simple manufacturing process, large-scale production, and high safety of the manufactured button battery cell structure.
  • a separator adhesive layer 132 is formed around both ends of the winding core 10, and the positive electrode sheet 11 and the negative electrode sheet 12 are completely wrapped in a sealed area, thereby effectively preventing the positive electrode sheet 11 and the negative electrode sheet 12 from moving and contacting the shell of the button battery. 50. Avoid short circuits, improve the service life of the button battery, ensure stable use in bumpy environments, and improve the safety of use.
  • a heating plate 40 is provided, and the heating plate 40 is heated to a preset temperature, including:
  • the arc-shaped heating plate 41, the first flat heating plate 42 and the second flat heating plate 43 are provided, and the arc-shaped heating plate 41, the first flat heating plate 42, and the second flat heating plate 43 are heated to a preset temperature,
  • the preset temperature is 100°C ⁇ 150°C.
  • the preset temperature is 122°C to 128°C.
  • the arc of the arc-shaped heating plate 41 is 30rad to 60rad.
  • the arc-shaped heating plate 41 , the first flat heating plate 42 and the second flat heating plate 43 are all made of thermally conductive materials, including but not limited to metal materials such as copper.
  • the surface of the metal material is plated with thermal insulation materials, including but not limited to ceramic materials.
  • the arc-shaped heating plate 41 , the first plane heating plate 42 and the second plane heating plate 43 are all made of copper, and the arc-shaped heating plate 41 , the first plane heating plate 42 and the second plane heating plate 43 are made of 13
  • the contact parts are plated with ceramics with a thickness of 20 ⁇ m on the surface.
  • step S150 referring to FIG. 9 , which is a partial cross-sectional structural view of the winding core 10 after step S150 is completed, the heating plate 40 scrapes the diaphragms 13 at both ends of the winding core 10 from the outside to the inside, so as to make the diaphragms 13 protrude.
  • the end 131 forms an inclined protruding end 131 comprising:
  • the pressing heights of the two pairs of the first flat heating plates 42 are controlled, and the scrapers of the two pairs of the first flat heating plates 42 extend to a preset depth position in the protruding end 131 of the diaphragm 13;
  • the scraper of the first flat heating plate 42 moves to the position of the inner hole 14 in the center of the winding core 10, and presses the protruding end 131 laterally, so that the protruding end 131 is inclined toward the inner hole 14 in the center of the winding core 10, so that the diaphragm 13
  • the width A1 reaches the value required in this example, which is 5mm; or
  • the pressing heights of the two pairs of arc-shaped heating plates 41 are controlled, and the scrapers of the two pairs of arc-shaped heating plates 41 extend to a preset depth position in the protruding end 131 of the diaphragm 13 ;
  • the scraper of the arc-shaped heating plate 41 moves to the position of the inner hole 14 in the center of the winding core 10, and squeezes the protruding end 131 in an arc shape, so that the protruding end 131 is inclined toward the inner hole 14 in the center of the winding core 10, so that the diaphragm 13
  • the width A1 reaches the value required in this example, ie 5mm.
  • the direction indicated by the straight arrow indicates the direction in which the scraper of the arc-shaped heating plate 41 scrapes the protruding end 131 of the diaphragm 13 .
  • the direction indicated by the straight arrow indicates the direction in which the scraper of the first flat heating plate 42 scrapes the protruding end 131 of the diaphragm 13 .
  • the first tab 20 and the second tab 30 are respectively located on the inner circle of the winding core 10
  • the used heating plates 40 are two pairs of first flat heating plates 42
  • the initial positions of the two pairs of first flat heating plates 42 are respectively located on both ends of the winding core 10, the scrapers of the two pairs of first flat heating plates 42 extend to a preset depth position in the protruding end 131 of the diaphragm 13, and the two pairs of first flat heating plates 42 extend to a preset depth position.
  • a flat heating plate 42 moves relatively, so that the scraper of the first flat heating plate 42 moves to the position of the inner hole 14 in the center of the winding core 10 , and laterally squeezes the protruding end 131 , so that the protruding end 131 moves toward the center of the winding core 10 .
  • the inner hole 14 is inclined;
  • the first tab 20 and the second tab 30 are respectively located on the inner circle of the winding core 10
  • the heating plates 40 used are two pairs of arc heating plate 41
  • the initial positions of the two pairs of arc-shaped heating plates 41 are located on the outer sides of the two ends of the winding core 10, respectively, and the scrapers of the two pairs of arc-shaped heating plates 41 extend to a preset depth position in the protruding end 131 of the diaphragm 13,
  • the two pairs of arc-shaped heating plates 41 move relative to each other, so that the scrapers of the two pairs of arc-shaped heating plates 41 move toward the center of the winding core 10 , and the arc-shaped extrusion protrusions 131 are inclined toward the center of the winding core 10 .
  • the first tab 20 and the second tab 30 are respectively located on the outer ring of the winding core 10
  • the heating plate 40 adopts two pairs of first flat heating plates 42
  • the initial positions of the two pairs of first plane heating plates 42 are respectively located at the two end faces of the winding core 10
  • the two pairs of first plane heating plates 42 move relative to each other
  • the scrapers of the two pairs of first plane heating plates 42 extend to the edge of the diaphragm 13
  • the protruding end 131 is laterally squeezed by the scrapers of the two pairs of the first flat heating plate 42 , so that the protruding end 131 is inclined toward the inner hole 14 in the center of the winding core 10 .
  • the length of the scraper of the first flat heating plate 42 and the scraper of the arc-shaped heating plate 41 are both 20 mm in length and 1 mm in width. Both end faces have a 45° chamfer.
  • step S160 Referring to FIG. 10, which is a partial cross-sectional structure diagram of the winding core 10 after step S160 is completed, the heating plate 40 hot-presses the inclined protruding ends 131, so that the inclined protruding ends 131 form a diaphragm adhesive that is sequentially bonded and shrunk.
  • Junction layer 132 including:
  • the directions indicated by the straight arrows indicate the directions in which the second flat heating plate 43 is pressed.
  • the inclined protruding ends 131 are hot pressed by the second flat heating plate 43, so that the adjacent protruding ends 131 are bonded and shrunk to each other, forming a membrane bond that completely wraps the positive electrode sheet 11 and the negative electrode sheet 12.
  • Layer 132 the directions indicated by the straight arrows indicate the directions in which the second flat heating plate 43 is pressed.
  • the first tab 20 and the second tab 30 are respectively located on the outer ring of the winding core 10 , and a pair of second flat heating plates 43 are used to heat press the inclined protruding ends 131 .
  • a pair of second flat heating plates 43 may adopt a solid circular structure, and a pair of second flat heating plates 43 move toward each other, so that the adjacent protruding ends 131 are bonded and contracted to each other, forming a complete package of the positive electrode sheet 11 and the negative electrode sheet. 12 of the membrane adhesive layer 132.
  • the first tab 20 and the second tab 30 are located on the inner circle of the winding core 10, respectively, and a pair of second flat heating plates 43 are used to heat press the inclined protruding ends 131.
  • a circular structure with a central opening can be adopted, and a pair of second flat heating plates 43 move toward each other, so that the adjacent protruding ends 131 are bonded and shrunk to each other, forming a complete wrapping of the positive electrode sheet 11 and the negative electrode sheet 12.
  • the membrane adhesive layer 132 is used to heat press the inclined protruding ends 131.
  • the second flat heating plate 43 adopts a circular structure with a diameter of 11 mm.
  • the width A2 of the diaphragm 13 reaches the preset value in this embodiment, namely 4.5 mm, so that the adjacent protruding ends 131 stick to each other
  • the junction shrinks to form a closed space, and the positive electrode sheet 11 and the negative electrode sheet 12 are completely covered by the separator 13 .
  • the positive electrode sheet 11 and the negative electrode sheet 12 are in the sealing area composed of the separator 13, and no matter how they move, they will not come into contact with the outer casing 50 of the battery and other items, thereby avoiding the button battery cell structure in harsh environments, especially In a bumpy environment, the positive electrode sheet 11 and the negative electrode sheet 12 are dislocated and contact with the metal casing 50 to cause a risk of short circuit, which greatly improves the safety of the button battery cell structure.
  • step S180 scraping and pressing the outermost ring/or outermost diaphragm 13 of the winding core 10 to bond it to the diaphragm adhesive layer 132, including:
  • the heating plates used are a pair of first flat heating plates 42 to scrape and press the outermost ring of the winding core 10 . diaphragm, so that the outermost diaphragm of the winding core 10 is bonded to the diaphragm adhesive layer 132, thereby improving the sealing performance of the diaphragm adhesive layer 132;
  • the used heating plates 40 are two pairs of arc-shaped heating plates 41 or a pair of first flat heating plates 42, which are used for scraping and rolling.
  • the membrane of the innermost circle of the winding core 10 is wound so that the membrane of the outermost circle of the winding core 10 is bonded to the membrane adhesive layer 132 , thereby improving the sealing performance of the membrane adhesive layer 132 .
  • the width A of the diaphragm 13 is between 4 mm and 10 mm; After forming the diaphragm adhesive layer 132 by hot pressing, the width A2 of the diaphragm 13 is between 3 mm and 9 mm.
  • the width B of the positive electrode sheet 11 is between 2 mm and 8 mm; the width C of the negative electrode sheet 12 is between 2.5 mm and 8.5 mm.
  • the length of the separator 13 beyond the positive electrode sheet 11 is 20% to 60%, preferably 30% to 50%, of the length of the separator 13 beyond the positive electrode sheet 11 before the separator bond layer 132 is formed.
  • first and second are only used for descriptive purposes, and should not be construed as indicating or implying relative importance or implying the number of indicated technical features. Thus, a feature defined as “first”, “second” may expressly or implicitly include one or more of that feature.
  • “plurality” means at least two, such as two, three, etc., unless otherwise expressly and specifically defined.
  • the terms “installed”, “connected”, “connected”, “fixed”, etc. should be understood in a broad sense, for example, it may be a fixed connection or a detachable connection, or It can be a mechanical connection, an electrical connection or can communicate with each other; it can be directly connected, or it can be indirectly connected through an intermediate medium, and it can make the internal communication of the two elements or the interaction relationship between the two elements.
  • installed e.g., it may be a fixed connection or a detachable connection, or It can be a mechanical connection, an electrical connection or can communicate with each other; it can be directly connected, or it can be indirectly connected through an intermediate medium, and it can make the internal communication of the two elements or the interaction relationship between the two elements.
  • a first feature "on” or “under” a second feature may include direct contact between the first and second features, or may include the first and second features Not directly but through additional features between them.
  • the first feature being “above”, “over” and “above” the second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is level higher than the second feature.
  • a first feature “below”, “below” and “below” a second feature includes that the first feature is directly below and diagonally below the second feature, or simply means that the first feature has a lower level than the second feature.

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Abstract

本发明提供一种纽扣电池电芯结构及其制造方法和纽扣电池，其中，纽扣电池电芯结构包括由层叠结构卷绕形成且具有中空内孔的卷绕卷芯，所述层叠结构包括至少一个正极片、至少一个负极片和将所述至少一个正极片和所述至少一个负极片隔开的隔膜，所述卷绕卷芯的至少两端设置有包裹所述卷绕卷芯的隔膜粘结层,所述隔膜粘结层用于将所述正极片和所述负极片固定。本发明提供一种纽扣电池电芯结构及其制造方法和纽扣电池，用以至少解决正极片和负极片容易发生窜动移位现象的技术问题，避免正极片和负极片与纽扣电池中的外壳接触而发生短路，提高纽扣电池的使用安全性。

Description

一种纽扣电池电芯结构及其制造方法和纽扣电池
本申请要求于2020年12月17日提交中国专利局、申请号为202011496907.3、申请名称为“一种纽扣电池电芯结构及其制造方法和纽扣电池”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
本发明涉及电池技术领域，尤其涉及一种纽扣电池电芯结构及其制造方法和纽扣电池。
背景技术
纽扣电池具有平稳的放电电压、工作温度范围广、储存寿命长等优点，被广泛用于各种电子产品内。可穿戴设备对纽扣电池的需求不断提升，譬如无线耳机，运动手表，手环，戒指等对纽扣电池的需求不断提升。
纽扣电池需要提升其在恶劣环境，尤其是颠簸环境下长时间使用的安全性，但是受限于工业制造水平的发展和市场需求，此前市场上的扣式电池以一次电池为主，二次扣式锂离子电池在市场中基本没有销售，且小型化的电子产品对于电池产品的空间尺寸有着较高的要求，纽扣电池由于电池尺寸的缩小和对尺寸一致性要求的提升，对制造技术提出了巨大的挑战，钢壳结构的纽扣电池能够更好的满足人们的使用需求。现有的纽扣电池电芯在恶劣环境下，尤其是颠簸的环境下或者跌落的情况下，容易发生正极片和负极片窜动移位的现象，导致与金属材质的外壳接触而发生短路，影响使用的安全性。
在这种需求下，我们亟需提供一种二次硬壳微型锂离子电池来满足广大用户的需求，通过改进纽扣电池电芯结构及其制造方法和纽扣电池，使其能够有效解决正极片和负极片容易窜动移位的现象，避免与纽扣电池中金属材质的壳体接触而发生短路。
发明内容
本发明提供一种纽扣电池电芯结构及制造方法和纽扣电池，用以至少解 决正极片和负极片容易发生窜动移位的现象的技术问题，避免正极片和负极片与纽扣电池中的外壳接触而发生短路，提高纽扣电池的使用安全性。
为了实现上述目的，本发明提供一种纽扣电池电芯结构，包括由层叠结构卷绕形成且具有中空内孔的卷绕卷芯，所述卷绕卷芯上设置有第一极耳和第二极耳，所述层叠结构包括至少一个正极片、至少一个负极片和将所述至少一个正极片和所述至少一个负极片隔开的隔膜，所述卷绕卷芯的至少两端设置有包裹所述卷绕卷芯的隔膜粘结层,所述隔膜粘结层用于将所述正极片和所述负极片固定。
本发明中通过设置隔膜粘结层，使得隔膜粘结层包裹所述卷绕卷芯的两端，从而使得隔膜粘结层覆盖包裹住正极片和负极片，将正极片或负极片包裹在密封的区域内，限制了正极片或负极片的窜动移位,即使在剧烈的震动情况下，例如跑步、跌落的情况下，也能够确保正极片和负极片上不会从卷绕卷芯内脱出，避免正极片和或负极片接触电池外壳造成短路，提高了纽扣电池电芯结构的使用安全性。
在一种可能实施的方式中，所述隔膜自所述卷绕卷芯的两端分别向外延伸并形成突出端，且所述突出端向所述卷绕卷芯的内孔方向倾斜，相邻的所述突出端相互粘结形成所述隔膜粘结层。
在一种可能实施的方式中，所述突出端的宽度D大于/或等于所述负极片的厚度与所述正极片的厚度以及所述隔膜的厚度之和。
在一种可能实施的方式中，所述第一极耳位于所述卷绕卷芯的外圈时，与所述第一极耳连接的所述正极片/或所述负极片的外侧设置所述隔膜；
所述隔膜粘结层包括位于所述第一极耳内侧的第一隔膜粘结层、以及位于所述第一极耳外侧的第二隔膜粘结层，且所述第一隔膜粘结层的粘结力大于所述第二隔膜粘结层的粘结力。
在一种可能实施的方式中，所述第一极耳位于所述卷绕卷芯的内圈时，与所述第一极耳连接的所述正极片/或所述负极片的内侧设置所述隔膜；
所述隔膜粘结层包括位于所述第一极耳内侧的第二隔膜粘结层、以及位于所述第一极耳外侧的第一隔膜粘结层，且所述第一隔膜粘结层的粘结力大于所述第二隔膜粘结层的粘结力。
在一种可能实施的方式中，所述第二隔膜粘结层覆盖所述第一极耳的面积占所述第一极耳面积的5％～30％。
在一种可能实施的方式中，形成所述隔膜粘结层前，所述隔膜的宽度A为4mm～10mm；形成所述隔膜粘结层后，所述隔膜的宽度A2为3mm～9mm。
在一种可能实施的方式中，所述正极片的宽度B为2mm～8mm，所述负极片的宽度C为2.5mm～8.5mm。
本发明还提供一种纽扣电池，包括上述的纽扣电池电芯结构，还包括外壳，所述外壳内具有容纳所述纽扣电池电芯结构的容纳腔，所述第一极耳的折弯部位于所述卷绕卷芯的至少一个端面上，所述第一极耳的折弯部接触所述隔膜粘结层，且所述第一极耳的折弯部与所述外壳的端面电连接。
本发明还提供一种纽扣电池电芯结构制造方法，用于制造上述的纽扣电池电芯结构，包括：
提供卷绕卷芯，所述卷绕卷芯包括正极片、负极片和将所述正极片和所述负极片隔开的隔膜；
提供第一极耳和第二极耳；
焊接所述第一极耳和所述第二极耳；
提供加热板并将所述加热板加热到预设的温度，包括提供弧形加热板和第一平面加热板，且将所述弧形加热板和所述第一平面加热板加热到所述预设的温度，所述预设的温度为122℃～128℃；
所述加热板将所述卷绕卷芯两端的隔膜由外向内刮，以使隔膜的突出端形成倾斜的突出端；
所述加热板热压倾斜的所述突出端，使倾斜的所述突出端形成依次粘结收缩的隔膜粘结层；
刮压所述第一极耳和所述第二极耳，使其压在所述隔膜粘结层的端面；
刮压所述卷绕卷芯最外圈/或最内圈的隔膜，使其粘结到所述隔膜粘结层上。
本发明提供的一种纽扣电池电芯结构制造方法，用于制造上述的纽扣电池电芯结构，其制造过程简单，本发明中通过采用热压工艺使得隔膜在卷绕卷芯的两端形成隔膜粘结层，将正极片和负极片完全包裹在密封的区域内，可明显提升纽扣电池在恶劣环境，尤其是颠簸环境下长时间使用的安全性。
本发明提供的一种纽扣电池电芯结构制造方法，通过形成完全包裹所述正极片和所述负极片的隔膜粘结层，从而将所述正极片和所述负极片完全与 纽扣电池的外壳隔离开，避免所述正极片和所述负极片窜动移位后接触到纽扣电池的外壳造成短路。本发明提供的纽扣电池电芯结构及其制造方法和纽扣电池，方便制造纽扣电池，并且使用本发明提供的纽扣电池电芯结构制造的纽扣电池，能够有效提高纽扣电池的使用安全性，在颠簸的环境下仍然可以正常使用不受影响，适用范围大。
除了上面所描述的本发明实施例解决的技术问题、构成技术方案的技术特征以及由这些技术方案的技术特征所带来的有益效果外，本发明实施例提供的一种纽扣电池电芯结构及其制造方法和纽扣电池所能解决的其他技术问题、技术方案中包含的其他技术特征以及这些技术特征带来的有益效果，将在具体实施方式中作出进一步详细的说明。
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以简单地介绍，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为本发明实施例提供的纽扣电池电芯结构制造方法中第一极耳和第二极耳均位于卷绕卷芯的内圈时，采用弧形加热板挤压卷绕卷芯的结构示意图；
图2为本发明实施例提供的纽扣电池电芯结构制造方法中第一极耳和第二极耳均位于卷绕卷芯的内圈时，采用第一平面加热板挤压卷绕卷芯的结构示意图；
图3为本发明实施例提供的纽扣电池电芯结构制造方法中第一极耳和第二极耳均位于卷绕卷芯的外圈时，采用第一平面加热板挤压卷绕卷芯的结构示意图；
图4为本发明实施例提供的纽扣电池电芯结构制造方法中第一极耳和第二极耳均位于卷绕卷芯的外圈时，采用第二平面加热板热压卷绕卷芯的结构示意图；
图5为本发明实施例提供的纽扣电池电芯结构制造方法中第一极耳和第二极耳均位于卷绕卷芯的内圈时，采用第二平面加热板挤压卷绕卷芯的结构 示意图；
图6为本发明实施例提供的纽扣电池电芯结构的热压前的结构示意图；
图7为本发明实施例提供的纽扣电池电芯结构的结构示意图；
图8为本发明实施例提供的纽扣电池电芯结构的刮隔膜前的局部结构示意图；
图9为本发明实施例提供的纽扣电池电芯结构的刮隔膜后的局部结构示意图；
图10为本发明实施例提供的纽扣电池电芯结构形成隔膜粘结层后的局部结构示意图；
图11为本发明实施例提供的纽扣电池电芯结构安装外壳的结构示意图；
图12为本发明实施例提供的纽扣电池电芯结构制造方法的流程图。
附图标记说明：
10-卷绕卷芯；
11-正极片；
12-负极片；
13-隔膜；
131-突出端；
132-隔膜粘结层；
14-内孔；
20-第一极耳；
21-折弯部；
30-第二极耳；
40-加热板；
41-弧形加热板；
42-第一平面加热板；
43-第二平面加热板；
50-外壳；
51-容纳腔。
具体实施方式
为使本发明的目的、技术方案和优点更加清楚，下面将结合本发明中的附图，对本发明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。
生活中，我们会发现纽扣电池广泛应用于许多超薄、小巧的电子产品中，比如体重计、电子手表、无线耳机等，纽扣电池具有体积小、电池放电电流小的特点，是许多电子产品续航的优选电源，也有利于电子产品向小巧化发展。
电芯结构是组成纽扣电池的核心部件，纽扣电池的电芯结构主要有两种制备工艺，一种是叠片工艺，叠片工艺是将正极片、负极片及隔膜裁成具体生产所需的形状及尺寸，然后将正极片、隔膜、负极片叠合成电芯主体；而另一种是卷绕工艺，卷绕工艺是将隔膜设置在正极片及负极片之间，然后将正极片、负极片以及隔膜卷成电芯主体的工艺方式。
叠片工艺需要将正极片、负极片及隔膜裁成具体生产所需的形状及尺寸，叠片工艺复杂程度较高，需要投入更多的生产时间；而卷绕工艺操作比较简便，只需要将正极片、负极片及隔膜设置成一定尺寸规则的条形状结构，比较简单方便，可以快速完成，容易实现产业自动化。因而大多数纽扣电池的电芯结构采用卷绕工艺。
但是现有的纽扣电池在恶劣环境下，尤其是颠簸的环境下或者跌落的情况下，容易发生正极片和负极片窜动移位的现象，导致与金属壳体接触而发生短路，影响使用的安全性。
鉴于上述背景，本发明提供的一种纽扣电池电芯结构及其制造方法和纽扣电池，对纽扣电池电芯结构及其制造方法和纽扣电池进行了改进，避免纽扣电池在颠簸的环境下或者跌落的情况下发生正极片和负极片窜动移位的现象，从而避免发生短路，提高使用寿命和使用的安全性。
参考图7和图8所示，一种纽扣电池电芯结构，包括由层叠结构卷绕形成且具有中空内孔14的卷绕卷芯10，层叠结构包括至少一个正极片11、至少一个负极片12和将至少一个正极片11和至少一个负极片12隔开的隔膜13，卷绕卷芯10的至少两端设置有包裹卷绕卷芯10的隔膜粘结层132,隔膜粘结层132用于将正极片11和负极片12固定，隔膜粘结层132使得正极片11和负极片12被稳定的包裹在密封的区域内，避免在纽扣电池发生跌落等剧烈的震动情况时，正极片11和负极片12窜动移位接触到电池的外壳50导致发生短路，提高使用的安全性。
内孔14位于卷绕卷芯10的中心位置，且内孔14贯通卷绕卷芯10的两端面。
参考图6和图8所示，隔膜13自卷绕卷芯10的两端分别向外延伸并形成突出端131，参考图9和图10所示，且突出端131向卷绕卷芯10的内孔14方向倾斜，相邻的突出端131相互粘结形成隔膜粘结层132。
容易理解的是，隔膜13的两侧分别自卷绕卷芯10的两端向外延伸，即隔膜13沿着卷绕卷芯10的轴向，自卷绕卷芯10的两端面向远离卷绕卷芯10的方向延伸。
具体是，层叠结构中，隔膜13的宽度大于每个正极片11的宽度，隔膜13的宽度也大于每个负极片12的宽度，这样使得在层叠结构沿隔膜13长度方向卷绕形成卷绕卷芯10后，在卷绕卷芯10的两端都会有余留出的隔膜13，余留出卷绕卷芯10的隔膜13即突出端131。
参考图6和图8所示，卷绕卷芯10可以是由自上而下或自下而上依次层叠设置的一个正极片11、隔膜13、一个负极片12、另一个隔膜13形成层叠结构后经过卷绕工艺形成；卷绕卷芯10也可以是由自上而下或自下而上依次层叠设置的一个负极片12、隔膜13、一个正极片11、另一个隔膜13形成层叠结构后经过卷绕工艺形成。
当然，层叠结构也可以是由多个负极片12和多个正极片11依次交替层叠设置，并且在每个负极片12/或每个正极片11的上侧和下侧设置使每个负极片12与每个正极片11完全隔开的隔膜13，将层叠结构通过卷绕工艺形成卷绕卷芯10。即使在卷绕卷芯10卷绕后，也要保证负极片12不会与正极片11接触，避免发生短路。
隔膜13用于防止负极片12与正极片11接触发生短路，隔膜13需要保证每个负极片12与每个正极片11完全隔开不产生接触即可，隔膜13不限于采用设置在每个负极片12与每个正极片11之间的方式，也可以采用套在每个负极片12上的方式，或者套在每个正极片11上的方式，以使得每个负极片12与每个正极片11完全隔开。
隔膜13位于至少一个正极片11的外侧和内侧/或至少一个负极片12的外侧和内侧，以使每个正极片11与每个负极片12完全隔开。即隔膜13位于至少一个正极片11的外侧和内侧，以使每个正极片11与每个负极片12完全隔开。或者，隔膜13位于至少一个负极片12的外侧和内侧，以使每个正极 片11与每个负极片12完全隔开。
参考图6所示，卷绕卷芯10呈螺旋卷绕状，因而在卷绕卷芯10的两端具有明显的螺旋圈，每一圈隔膜13的突出端131向卷绕卷芯10的内孔14方向倾斜，并粘结到相邻内圈的隔膜13的突出端131上。
参考图10所示，每一圈隔膜13的突出端131与相邻内圈的隔膜13的突出端131部分重叠。因此，为了确保每一圈隔膜13的突出端131与相邻内圈的隔膜13的突出端131部分重叠，突出端131的宽度D需要满足D大于/或等于正极片11的厚度、负极片12的厚度以及隔膜13的厚度三者之和。
参考图6和图7所示，在卷绕卷芯10的两端分别设置第一极耳20和第二极耳30，第一极耳20和第二极耳30中的其中一个为正极耳，第一极耳20和第二极耳30中的另一个为负极耳，正极耳与正极片11连接，负极耳与负极片12连接。
参考图6和图7所示，第一极耳20位于卷绕卷芯10的外圈时，第二极耳30位于卷绕卷芯10的外圈，且第一极耳20和第二极耳30中的一个连接在卷绕卷芯10的上端，第一极耳20和第二极耳30中的另一个连接在卷绕卷芯10的下端。第一极耳20位于卷绕卷芯10的外圈，是指第一极耳20和其所连接的正极片11/或负极片12的连接位置处于卷绕卷芯10的外部圈层，外部是指卷绕卷芯靠近纽扣电池外壳50的部分。
参考图6和图7所示，第一极耳20位于卷绕卷芯10的外圈时，与第一极耳20连接的正极片11/或负极片12的外侧设置隔膜13；隔膜粘结层132包括位于第一极耳20内侧的第一隔膜粘结层、以及位于第一极耳20外侧的第二隔膜粘结层，且第一隔膜粘结层的粘结力大于第二隔膜粘结层的粘结力；与第二极耳30连接的正极片11/或负极片12的外侧设置隔膜13；隔膜粘结层132包括位于第二极耳30内侧的第一隔膜粘结层、以及位于第二极耳30外侧的第二隔膜粘结层，且第一隔膜粘结层的粘结力大于第二隔膜粘结层的粘结力。在加工第一隔膜粘结层时，需要采用加热板40将卷绕卷芯10两端的隔膜13的突出端131由卷绕卷芯10的边缘向卷绕卷芯10中心的内孔14方向刮，除了在与第一极耳20和第二极耳30连接的正极片11/或负极片12的外圈设置的一层隔膜13外，其余正极片11/或负极片12的内圈设置的隔膜13的突出端131均向卷绕卷芯10中心的内孔14方向刮，使隔膜13的突出端131倾斜，再通过平面热压使得卷绕卷芯10两端倾斜的突出端131粘结收缩， 形成第一隔膜粘结层。且第一隔膜粘结层的粘结力大于第二隔膜粘结层的粘结力。
其中，粘结力指的是形成隔膜粘结层132之后，用力将隔膜粘结层132分开，使得隔膜粘结层132分开所需的力的大小表示粘结力。粘结力越大，使得隔膜粘结层132分开所需的力越大。
作为本实施例的又一实施方式，参考图1和图2所示，第一极耳20位于卷绕卷芯10的内圈时，第二极耳30位于卷绕卷芯10的内圈，且第一极耳20和第二极耳30中的一个连接在卷绕卷芯10的上端，第一极耳20和第二极耳30中的另一个连接在卷绕卷芯10的下端。
参考图1和图2所示，第一极耳20位于卷绕卷芯10的内圈时，与第一极耳20连接的正极片11/或负极片12的内侧设置隔膜13；隔膜粘结层132包括位于第一极耳20内侧的第二隔膜粘结层、以及位于第一极耳20外侧的第一隔膜粘结层，且第一隔膜粘结层的粘结力大于第二隔膜粘结层的粘结力；第二极耳30位于卷绕卷芯10的内圈，与第二极耳30连接的正极片11/或负极片12的内侧设置隔膜13；隔膜粘结层132包括位于第二极耳30内侧的第二隔膜粘结层、以及位于第二极耳30外侧的第一隔膜粘结层，且第一隔膜粘结层的粘结力大于第二隔膜粘结层的粘结力。在加工第一隔膜粘结层时，需要采用加热板40将卷绕卷芯10两端的隔膜13的突出端131由卷绕卷芯10的边缘向卷绕卷芯10中心的内孔14方向刮，除了在与第一极耳20和第二极耳30连接的正极片11/或负极片12的内圈设置的一层隔膜13外，其余正极片11/或负极片12的外圈的隔膜13的突出端131均向卷绕卷芯10中心的内孔14方向刮，使隔膜13的突出端131倾斜，再通过平面热压使得卷绕卷芯10两端倾斜的突出端131粘结收缩，形成第一隔膜粘结层。且第一隔膜粘结层的粘结力小于第二隔膜粘结层的粘结力。第一极耳20位于卷绕卷芯10的内圈，是指第一极耳20和其所连接的正极片11/或负极片12的连接位置处于卷绕卷芯10的内部圈层，内部是指卷绕卷芯靠近内孔14的部分。
参考图11所示，热压后对于第一极耳20和第二极耳30进行刮压，使第一极耳20和第二极耳30在隔膜粘结层132的端面，对于最外圈的隔膜13进行刮压，最外圈的隔膜13与次外圈的隔膜13之间的粘接力小于其他圈的隔膜13之间的粘接力。
特别的，第一极耳20位于卷绕卷芯10的外圈时，第二极耳30位于卷绕 卷芯10的内圈，且第一极耳20和第二极耳30中的一个连接在卷绕卷芯10的上端，第一极耳20和第二极耳30中的另一个连接在卷绕卷芯10的下端，与第一极耳20连接的正极片11/或负极片12的外侧、以及与第二极耳30连接的正极片11/或负极片12的内侧均设置隔膜13；此时，隔膜粘结层132包括位于第一极耳20内侧的第一隔膜粘结层、位于第二极耳30外侧的第一隔膜粘结层、位于第一极耳20外侧的第二隔膜粘结层、以及位于第二极耳30内侧的第二隔膜粘结层，且第一隔膜粘结层的粘结力大于第二隔膜粘结层的粘结力。
第二隔膜粘结层覆盖第一极耳20的面积占第一极耳20面积的5％～30％；第二隔膜粘结层覆盖第二极耳30的面积占第二极耳30面积的5％～30％。
将本发明提供的纽扣电池电芯结构的安装到外壳50内进行封装，卷绕卷芯10通过负极耳与纽扣电池的金属材质的外壳50连接，卷绕卷芯10通过正极耳与纽扣电池的金属材质的外壳50连接。
在本实施方式中，参考图8和图9所示，形成隔膜粘结层132之前，隔膜13的宽度A在4mm～10mm之间；形成隔膜粘结层132后，隔膜13的宽度A2为3mm～9mm之间。正极片11的宽度B在2mm～8mm之间，负极片12的宽度C在2.5mm～8.5mm之间。
在本实施方式中，隔膜13可以采用5+2+2μm的大孔油系隔膜，其熔点为125℃。正极片11的基材可以采用厚度为10μm的铝箔，在正极片11的基材的正反两面涂布涂层，其涂层的厚度为75μm。负极片12的基材可以采用厚度为5μm的铜箔，在负极片12的基材的正反两面涂布涂层，其涂层厚度为85μm。
优选的，卷绕卷芯10的直径为10mm，宽度为5.5mm，隔膜13的宽度A为5.5mm，负极片12的宽度C为4mm，正极片11的宽度B为3.5mm。
参考图11所示，本发明还提供一种纽扣电池，包括上述的纽扣电池电芯结构，还包括外壳50，外壳50内具有容纳纽扣电池电芯结构的容纳腔51，在外壳50上设置有密封容纳腔51的壳盖，外壳50用于将纽扣电池电芯结构封装在其中，保护纽扣电池电芯结构。
第一极耳20的一端连接正极片11/或负极片12，第一极耳20的中间部分折弯形成近乎平行于卷绕卷芯10端面的折弯部21，折弯部21向第一极耳20的另一端延伸。第一极耳20的折弯部21位于卷绕卷芯10的至少一个端面 上，第一极耳20的折弯部21接触隔膜粘结层132，且第一极耳20的折弯部21与外壳50的端面电连接。
具体是，折弯部21的一面接触隔膜粘结层132的第一隔膜粘结层，第一极耳20的折弯部21的另一面与外壳50的端面通过接触实现电连接。
由于现有的卷绕卷芯10中，隔膜13的突出端131松散且强度较低，不能很好的起到绝缘作用，所以需要在现有的卷绕卷芯10的端面贴绝缘胶纸使得第一极耳20和卷绕卷芯10的两端面绝缘。而本申请提供的纽扣电池中，在卷绕卷芯10的端面具有包裹卷绕卷芯10的隔膜粘结层132，隔膜粘结层132将卷绕卷芯10包裹收紧，隔膜粘结层132使得第一极耳20与卷绕卷芯10的两端面绝缘，因而可以将第一极耳20直接折弯使其接触到隔膜粘结层132上，不再需要使用绝缘胶纸，简化了纽扣电池的结构。
本发明还提供一种纽扣电池电芯结构制造方法，参考图12所示，用于制造上述的纽扣电池电芯结构，包括以下步骤：
步骤S110：提供卷绕卷芯10，卷绕卷芯10包括正极片11、负极片12和将正极片11和负极片12隔开的隔膜13，参考图8所示为提供的提供卷绕卷芯10局部剖面结构示意图；
步骤S120：提供第一极耳20和第二极耳30，第一极耳20和第二极耳30其中的一个为正极耳，第一极耳20和第二极耳30其中的另一个为负极耳；
步骤S130：焊接第一极耳20和第二极耳30，第一极耳20和第二极耳30中的正极耳与正极片11连接，第一极耳20和第二极耳30中的负极耳与负极片12连接；
步骤S140：提供加热板40并将加热板40加热到预设的温度；
步骤S150：加热板40将卷绕卷芯10两端的隔膜13由外向内刮，以使隔膜13的突出端131形成倾斜的突出端131；
步骤S160：加热板40热压倾斜的突出端131，使倾斜的突出端131形成依次粘结收缩的隔膜粘结层132，具体是使倾斜的突出端131形成依次粘结收缩的第一隔膜粘结层。
步骤S170：刮压第一极耳20和第二极耳30，使其压在隔膜粘结层132的端面；具体是刮压第一极耳20和第二极耳30，使其压在隔膜粘结层132的第一隔膜粘结层上。
步骤S180：刮压卷绕卷芯10最外圈/或最内圈的隔膜13，使其粘结到隔 膜粘结层132上。具体是刮压卷绕卷芯10最外圈/或最内圈的隔膜13，使其粘结到隔膜粘结层132上形成第二隔膜粘结层。
本发明中提供的一种纽扣电池电芯结构制造方法，其制造过程简单，能够进行规模化生产，制造的纽扣电池电芯结构安全性好，本发明中通过采用热压工艺使得隔膜13在卷绕卷芯10的两端形成隔膜粘结层132，将正极片11和负极片12完全包裹在密封的区域内，从而有效避免正极片11和负极片12窜动移位接触到纽扣电池的外壳50，避免发生短路，提高纽扣电池的使用寿命，在颠簸的环境下也能确保稳定使用，提高使用安全性。
其中，在步骤S140中，提供加热板40，加热板40加热到预设的温度，包括：
提供弧形加热板41、第一平面加热板42和第二平面加热板43，且将弧形加热板41、第一平面加热板42、以及第二平面加热板43加热到预设的温度，预设的温度为100℃～150℃。
优选的，其预设的温度为122℃～128℃。
弧形加热板41的弧度为30rad～60rad。
其中，弧形加热板41、第一平面加热板42和第二平面加热板43均采用导热材料，包括但不限于采金属材料，例如铜。金属材质的表面镀有保温材料，包括但不限于采用陶瓷材料。
优选的，弧形加热板41、第一平面加热板42和第二平面加热板43均采用铜材质，在弧形加热板41、第一平面加热板42和第二平面加热板43中与隔膜13接触的部位均在表面镀有厚度为20μm的陶瓷。
在步骤S150中，参考图9所示为步骤S150完成后的卷绕卷芯10局部剖面结构图，加热板40将卷绕卷芯10两端的隔膜13由外向内刮，以使隔膜13的突出端131形成倾斜的突出端131，包括：
参考图2和图3所示，控制两对第一平面加热板42的下压高度，两对第一平面加热板42的刮刀延伸到隔膜13的突出端131内预设的深度位置；
第一平面加热板42的刮刀向卷绕卷芯10中心的内孔14位置移动，并横向挤压突出端131，使突出端131向卷绕卷芯10中心的内孔14倾斜，使得隔膜13的宽度A1达到此实施例中需要的值，即5mm；或者
参考图1所示，控制两对弧形加热板41的下压高度，两对弧形加热板41的刮刀延伸到隔膜13的突出端131内预设的深度位置；
弧形加热板41的刮刀向卷绕卷芯10中心的内孔14位置移动，并弧形挤压突出端131，使突出端131向卷绕卷芯10中心的内孔14倾斜，使得隔膜13的宽度A1达到此实施例中需要的值，即5mm。
在图1中，直线箭头所指示的方向表示弧形加热板41的刮刀刮动隔膜13的突出端131的方向。在图2和图3中，直线箭头所指示的方向表示第一平面加热板42的刮刀刮动隔膜13的突出端131的方向。
在本实施例中，参考图2所示，第一极耳20和第二极耳30分别位于卷绕卷芯10的内圈，采用的加热板40为两对第一平面加热板42，且两对第一平面加热板42的初始位置分别位于卷绕卷芯10两端面，两对第一平面加热板42的刮刀延伸到隔膜13的突出端131内预设的深度位置，且两对第一平面加热板42相对运动，使得第一平面加热板42的刮刀向卷绕卷芯10中心的内孔14位置移动，并横向挤压突出端131，使突出端131向卷绕卷芯10中心的内孔14倾斜；
在本实施例的又一实施方式中，参考图1所示，第一极耳20和第二极耳30分别位于卷绕卷芯10的内圈，采用的加热板40为两对弧形加热板41，且两对弧形加热板41的初始位置分别位于卷绕卷芯10两端面的外侧，两对弧形加热板41的刮刀延伸到隔膜13的突出端131内预设的深度位置，两对弧形加热板41相对运动，使得两对弧形加热板41的刮刀向卷绕卷芯10的中心位置移动，并弧形挤压突出端131向卷绕卷芯10中心的位置倾斜。
作为本实施例的又一实施例，参考图3所示，第一极耳20和第二极耳30分别位于卷绕卷芯10的外圈，加热板40采用两对第一平面加热板42，两对第一平面加热板42的初始位置分别位于卷绕卷芯10的两端面，两对第一平面加热板42相对运动，且两对第一平面加热板42的刮刀延伸到隔膜13的突出端131内预设的深度位置，通过两对第一平面加热板42的刮刀横向挤压突出端131，使突出端131向卷绕卷芯10中心的内孔14倾斜。
具体的，第一平面加热板42的刮刀和弧形加热板41的刮刀，其长度均为长20mm，宽度均为1mm，并且在第一平面加热板42的刮刀和弧形加热板41的刮刀端面均具有45°的倒角。
步骤S160中：参考图10所示为步骤S160完成后的卷绕卷芯10局部剖面结构图，加热板40热压倾斜的突出端131，使倾斜的突出端131形成依次粘结收缩的隔膜粘结层132，包括：
在图4和图5中，直线箭头所指示的方向表示第二平面加热板43挤压的方向。参考图4和图5所示，采用第二平面加热板43热压倾斜的突出端131，使得相邻的突出端131相互粘结收缩，形成完全包裹正极片11和负极片12的隔膜粘结层132。
具体是，参考图4所示，第一极耳20和第二极耳30分别位于卷绕卷芯10的外圈，采用一对第二平面加热板43热压倾斜的突出端131，此种情况，一对第二平面加热板43可以采用实心的圆形结构，一对第二平面加热板43相向运动，使得相邻的突出端131相互粘结收缩，形成完全包裹正极片11和负极片12的隔膜粘结层132。
参考图5所示，第一极耳20和第二极耳30分别位于卷绕卷芯10的内圈，采用一对第二平面加热板43热压倾斜的突出端131，此种情况，一对第二平面加热板43可以采用中心开孔的圆形结构，一对第二平面加热板43相向运动，使得相邻的突出端131相互粘结收缩，形成完全包裹正极片11和负极片12的隔膜粘结层132。
第二平面加热板43采用直径为11mm的圆形结构。
在本实施例中，通过控制第二平面加热板43的温度和下压高度，使隔膜13的宽度A2达到此实施例中预设的值，即4.5mm，使得相邻的突出端131相互粘结收缩，形成密闭的空间，正极片11和负极片12完全被隔膜13包覆。正极片11和负极片12在由隔膜13组成的密封区域内，无论如何窜动都不会与电池的外壳50以及其他物品接触，从而避免了该纽扣电池电芯结构在恶劣环境下，尤其是颠簸的环境下正极片11和负极片12错位后与金属材质的外壳50接触而导致短路的风险，大大提升该纽扣电池电芯结构的安全性。
在步骤S180中，刮压卷绕卷芯10最外圈/或最外圈的隔膜13，使其粘结到隔膜粘结层132上，包括：
当第一极耳20和第二极耳30分别位于卷绕卷芯10的外圈时，采用的加热板为一对第一平面加热板42，进行刮压卷绕卷芯10最外圈的隔膜，使得卷绕卷芯10最外圈的隔膜粘结到隔膜粘结层132上，从而提高隔膜粘结层132的密封性能；
第一极耳20和第二极耳30分别位于卷绕卷芯10的内圈时，采用的加热板40为两对弧形加热板41或者一对第一平面加热板42，进行刮压卷绕卷芯10最内圈的隔膜，使得卷绕卷芯10最外圈的隔膜粘结到隔膜粘结层132上， 从而提高隔膜粘结层132的密封性能。
在本实施方式中，参考图8和图9所示，形成隔膜粘结层132之前，隔膜13的宽度A在4mm～10mm之间；在将隔膜13的突出端131刮倒，使其倾斜，热压形成隔膜粘结层132后，隔膜13的宽度A2在3mm～9mm之间。
正极片11的宽度B在2mm～8mm之间；负极片12的宽度C在2.5mm～8.5mm之间。
经过热压形成隔膜粘结层132后，隔膜13超出正极片11的长度为形成隔膜粘结层132之前隔膜13超出正极片11的长度的20％～60％,优选30％～50％。
在本发明的描述中，需要理解的是，所使用的术语“中心”、“长度”、“宽度”、“厚度”、“顶端”、“底端”、“上”、“下”、“左”、“右”、“前”、“后”、“竖直”、“水平”、“内”、“外”“轴向”、“周向”等指示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位置或原件必须具有特定的方位、以特定的构造和操作，因此不能理解为对本发明的限制。
此外，术语“第一”、“第二”仅用于描述目的，而不能理解为指示或暗示相对重要性或者隐含指明所指示的技术特征的数量。由此，限定有“第一”、“第二”的特征可以明示或者隐含地包括一个或者更多个该特征。在本发明的描述中，“多个”的含义是至少两个，例如两个、三个等，除非另有明确具体的限定。
在本发明中，除非另有明确的规定和限定，术语“安装”、“相连”、“连接”、“固定”等应做广义理解，例如可以是固定连接，也可以是可拆卸连接，或成为一体；可以是机械连接，也可以是电连接或者可以互相通讯；可以是直接相连，也可以通过中间媒介间接相连，可以使两个元件内部的连通或两个元件的相互作用关系。对于本领域的普通技术人员而言，可以根据具体情况理解上述术语在本发明中的具体含义。
在本发明中，除非另有明确的规定和限定，第一特征在第二特征之“上”或之“下”可以包括第一和第二特征直接接触，也可以包括第一和第二特征不是直接接触而是通过它们之间的另外的特征接触。而且，第一特征在第二特征“之上”、“上方”和“上面”包括第一特征在第二特征正上方和斜上方，或仅仅表示第一特征水平高度高于第二特征。第一特征在第二特征“之下”、“下方”和“下面”包括第一特征在第二特征正下方和斜下方，或仅仅表示 第一特征水平高度小于第二特征。
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. 一种纽扣电池电芯结构，包括由层叠结构卷绕形成且具有中空内孔(14)的卷绕卷芯(10)，所述卷绕卷芯(10)上设置有第一极耳(20)和第二极耳(30)，所述层叠结构包括至少一个正极片(11)、至少一个负极片(12)和将所述至少一个正极片(11)和所述至少一个负极片(12)隔开的隔膜(13)，其特征在于，所述卷绕卷芯(10)的至少两端设置有包裹所述卷绕卷芯(10)的隔膜粘结层(132),所述隔膜粘结层(132)用于将所述正极片(11)和所述负极片(12)固定。
  2. 根据权利要求1所述的纽扣电池电芯结构，其特征在于，所述隔膜(13)自所述卷绕卷芯(10)的两端分别向外延伸并形成突出端(131)，且所述突出端(131)向所述卷绕卷芯(10)的内孔(14)方向倾斜，相邻的所述突出端(131)相互粘结形成所述隔膜粘结层(132)。
  3. 根据权利要求2所述的纽扣电池电芯结构，其特征在于，所述突出端(131)的宽度D大于/或等于所述负极片(12)的厚度与所述正极片(11)的厚度以及所述隔膜(13)的厚度之和。
  4. 根据权利要求3所述的纽扣电池电芯结构，其特征在于，所述第一极耳(20)位于所述卷绕卷芯(10)的外圈时，与所述第一极耳(20)连接的所述正极片(11)/或所述负极片(12)的外侧设置所述隔膜(13)；
    所述隔膜粘结层(132)包括位于所述第一极耳(20)内侧的第一隔膜粘结层、以及位于所述第一极耳(20)外侧的第二隔膜粘结层，且所述第一隔膜粘结层的粘结力大于所述第二隔膜粘结层的粘结力。
  5. 根据权利要求3所述的纽扣电池电芯结构，其特征在于，所述第一极耳(20)位于所述卷绕卷芯(10)的内圈时，与所述第一极耳(20)连接的所述正极片(11)/或所述负极片(12)的内侧设置所述隔膜(13)；
    所述隔膜粘结层(132)包括位于所述第一极耳(20)内侧的第二隔膜粘结层、以及位于所述第一极耳(20)外侧的第一隔膜粘结层，且所述第一隔膜粘结层的粘结力大于所述第二隔膜粘结层的粘结力。
  6. 根据权利要求4-5任一所述的纽扣电池电芯结构，其特征在于，所述第二隔膜粘结层覆盖所述第一极耳(20)的面积占所述第一极耳(20)面积的5％～30％。
  7. 根据权利要求4-5任一所述的纽扣电池电芯结构，其特征在于，形成 所述隔膜粘结层(132)前，所述隔膜(13)的宽度A为4mm～10mm；形成所述隔膜粘结层(132)后，所述隔膜(13)的宽度A2为3mm～9mm。
  8. 根据权利要求7所述的纽扣电池电芯结构，其特征在于，所述正极片(11)的宽度B为2mm～8mm，所述负极片(12)的宽度C为2.5mm～8.5mm。
  9. 一种纽扣电池，包括权利要求1-8任一所述的纽扣电池电芯结构，其特征在于，还包括外壳(50)，所述外壳(50)内具有容纳所述纽扣电池电芯结构的容纳腔(51)，所述第一极耳(20)的折弯部(21)位于所述卷绕卷芯(10)的至少一个端面上，所述第一极耳(20)的折弯部(21)接触所述隔膜粘结层(132)，且所述第一极耳(20)的折弯部(21)与所述外壳(50)的端面电连接。
  10. 一种纽扣电池电芯结构制造方法，用于制造权利要求1-8任一所述的纽扣电池电芯结构，其特征在于，包括：
    提供卷绕卷芯(10)，所述卷绕卷芯(10)包括正极片(11)、负极片(12)和将所述正极片(11)和所述负极片(12)隔开的隔膜(13)；
    提供第一极耳(20)和第二极耳(30)；
    焊接所述第一极耳(20)和所述第二极耳(30)；
    提供加热板(40)并将所述加热板(40)加热到预设的温度，包括提供弧形加热板(41)和第一平面加热板(42)，且将所述弧形加热板(41)和所述第一平面加热板(42)加热到所述预设的温度，所述预设的温度为122℃～128℃；
    所述加热板(40)将所述卷绕卷芯(10)两端的隔膜(13)由外向内刮，以使隔膜(13)的突出端(131)形成倾斜的突出端(131)；
    所述加热板(40)热压倾斜的所述突出端(131)，使倾斜的所述突出端(131)形成依次粘结收缩的隔膜粘结层(132)；
    刮压所述第一极耳(20)和所述第二极耳(30)，使其压在所述隔膜粘结层(132)的端面；
    刮压所述卷绕卷芯(10)最外圈/或最内圈的隔膜(13)，使其粘结到所述隔膜粘结层(132)上。
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