WO2023030547A1 - 扣式锂离子电池及电子产品 - Google Patents

扣式锂离子电池及电子产品 Download PDF

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Publication number
WO2023030547A1
WO2023030547A1 PCT/CN2022/118277 CN2022118277W WO2023030547A1 WO 2023030547 A1 WO2023030547 A1 WO 2023030547A1 CN 2022118277 W CN2022118277 W CN 2022118277W WO 2023030547 A1 WO2023030547 A1 WO 2023030547A1
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WO
WIPO (PCT)
Prior art keywords
cover
plate
ion battery
lithium ion
battery according
Prior art date
Application number
PCT/CN2022/118277
Other languages
English (en)
French (fr)
Inventor
何安轩
胡彦庆
曾亮
罗春花
李强广
Original Assignee
深圳市格瑞普电池有限公司
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
Priority claimed from CN202121594784.7U external-priority patent/CN215869581U/zh
Priority claimed from CN202221057394.0U external-priority patent/CN217387251U/zh
Application filed by 深圳市格瑞普电池有限公司 filed Critical 深圳市格瑞普电池有限公司
Publication of WO2023030547A1 publication Critical patent/WO2023030547A1/zh

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/147—Lids or covers
    • H01M50/148—Lids or covers characterised by their shape
    • H01M50/153—Lids or covers characterised by their shape for button or coin cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • 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

Definitions

  • the invention relates to the field of lithium ion batteries, in particular to a button lithium ion battery and electronic products.
  • button-type lithium-ion batteries As the application of smart wearable products becomes more and more extensive, people's demand for small-sized lithium-ion button-type secondary rechargeable batteries (referred to as button-type lithium-ion batteries) is also increasing. Button-type lithium-ion batteries are more and more used in smart wearable products, such as wireless Bluetooth headsets, etc. With the increasing application of button-type lithium-ion batteries, such as headphones, the requirements for batteries are also increasing high.
  • One of the objectives of the embodiments of the present invention is to provide a lithium-ion battery and a combined cover suitable for the lithium-ion battery.
  • the application of this technical solution is beneficial to reduce the defective rate of the lithium-ion battery.
  • a button lithium ion battery provided by an embodiment of the present invention includes:
  • Battery body including laminated or wound body and electrolyte
  • the laminated body or winding body includes a first pole piece and a second pole piece, and a diaphragm is spaced between each adjacent first pole piece and second pole piece, and the first pole piece, the second pole piece
  • One of the dipole sheets is a positive electrode sheet, and the other is a negative electrode sheet, and the electrolyte is in the pores in each of the first pole piece, the second pole piece, and the separator in the laminated body or winding body, And between the first pole piece, the second pole piece, and the gap between any two of the diaphragm;
  • the sealed case includes an integrated metal case with an opening, a combination cover is arranged at the opening of the metal case, and the battery body is sealed in the space formed by the metal case and the combination cover ,
  • the combined cover includes a cover inner plate and a cover outer plate made of metal materials, and holes are arranged on the cover outer plate,
  • the outer diameter of the cover inner plate is wider than the diameter of the hole and narrower than the outer diameter of the cover outer plate, a first insulating layer is spaced between the cover inner plate and the cover outer plate, and the cover The top surface of the inner plate located outside the hole is in close contact with the bottom surface of the cover outer plate, and the top surface of the cover inner plate located in the hole is exposed to the top from the hole,
  • the bottom surface of the cover outer plate and the cover inner plate faces the sealed space of the laminated body or winding body, the outer periphery of the cover outer plate is melt-tightly combined with the metal material at the opening of the metal shell,
  • the cover inner plate is electrically connected to the tab of the first pole piece to serve as the first electrode of the battery,
  • the cover outer plate or the metal shell is electrically connected to the tab of the second pole piece to serve as the second electrode of the battery.
  • the bottom surface of the cover outer plate in this embodiment is also provided with an annular protrusion protruding toward the bottom surface.
  • the annular protrusion is located in the metal shell and has a narrow gap with the inner wall of the metal shell. Under the annular protrusion, ensure that the laminated body or winding body at this position has a predetermined distance from the connection position between the outer cover plate and the metal shell, so as to avoid high temperature heat conduction when welding the metal shell around the outer periphery of the cover outer plate damage to the laminated body or wound body.
  • adopting the technical solution of this embodiment is beneficial to greatly reducing the defect rate of the button lithium ion battery.
  • the outer periphery of the combination cover of the button-type lithium-ion battery in this embodiment is connected to the opening of the metal case by metal fusion bonding, and the laminated body (or winding body) and the electrolyte are sealed in the sealed case.
  • the technical solution is to realize the sealing of the casing by compressing the sealing ring between the inner and outer metal casings.
  • the sealing connection of this implementation technical solution is more reliable, which reduces or avoids the risk of liquid leakage after storage or circulation of button lithium-ion batteries. , improving the reliability and safety of the button lithium-ion battery.
  • the combined cover of this embodiment integrates the outer cover plate and the inner cover plate with insulation through thermal compounding of the insulating layer, the outer cover plate and the inner cover plate through the thermal compound sealing combination of the insulating layer, the outer cover plate and the inner cover plate.
  • the three are firmly sealed together to ensure the sealing, and the process is simple and easy to realize, which is especially beneficial to popularization and application.
  • it is especially suitable for the thin design of the combined cover to improve the effective use of space for lithium-ion batteries and increase the capacity of the battery.
  • Fig. 1 is a side view structural schematic diagram of a button lithium ion battery provided by Embodiment 1 of the present invention
  • FIG. 2 is a schematic top view of the battery shown in FIG. 1;
  • FIG. 3 is a schematic diagram of a three-dimensional structure of the battery shown in FIG. 1;
  • Fig. 4 is a schematic top view structural diagram of a composite cover provided in Embodiment 1 of the present invention.
  • Fig. 5 is a schematic bottom view of a composite cover provided in Embodiment 1 of the present invention.
  • Fig. 6 is a schematic side view structural diagram of a composite cover provided in Embodiment 1 of the present invention.
  • Fig. 7 is a schematic diagram of a three-dimensional structure of a combined cover provided in Embodiment 1 of the present invention.
  • Fig. 8 is a top view structural schematic diagram of a cover outer panel provided by Embodiment 1 of the present invention.
  • Fig. 9 is a schematic bottom view of a cover outer panel provided by Embodiment 1 of the present invention.
  • Fig. 10 is a side view structural schematic diagram of a cover outer panel provided by Embodiment 1 of the present invention.
  • Fig. 11 is a schematic top view structural diagram of a cover inner panel provided by Embodiment 1 of the present invention.
  • Fig. 12 is a schematic bottom view of a cover inner panel provided in Embodiment 1 of the present invention.
  • Fig. 13 is a side structural schematic diagram of a cover inner panel provided by Embodiment 1 of the present invention.
  • Fig. 14 is a top view and a bottom view structural schematic diagram of an insulating layer provided in Embodiment 1 of the present invention.
  • FIG. 15 is a schematic side view of an insulating layer provided in Embodiment 1 of the present invention.
  • Fig. 16 is a top view and a bottom view structural schematic diagram of a sealing nail provided by Embodiment 1 of the present invention.
  • Fig. 17 is a schematic side view of a sealing nail provided in Embodiment 1 of the present invention.
  • FIG. 18 is a schematic top view of a button-type lithium-ion battery provided in Embodiment 2 of the present invention.
  • Fig. 19 is a schematic diagram of the A-A sectional structure of the button lithium ion battery shown in Fig. 17;
  • FIG. 20 is a schematic top view of another button-type lithium-ion battery provided in Embodiment 2 of the present invention.
  • Fig. 21 is a schematic diagram of the A-A sectional structure of the button lithium ion battery shown in Fig. 19;
  • Fig. 22 is a side view schematic diagram of the button lithium ion battery shown in Figs. 17 and 18;
  • Fig. 23 is a schematic bottom view of a cover inner panel provided by Embodiment 2 of the present invention.
  • Fig. 24 is a schematic top view structural diagram of a cover inner panel provided by Embodiment 2 of the present invention.
  • Fig. 25 is a schematic cross-sectional structure diagram of a cover inner panel provided by Embodiment 2 of the present invention.
  • Fig. 26 is a schematic top view of a cover outer panel provided by Embodiment 2 of the present invention.
  • Fig. 27 is a schematic bottom view of a cover outer panel provided by Embodiment 2 of the present invention.
  • first insulating layer 24: hole; 25: annular protrusion;
  • 26 The first sealing nail
  • 27 Liquid injection hole
  • This embodiment provides a button-type lithium ion battery, which mainly includes a battery body and a sealed case for assembling the battery body.
  • the core of the battery body is a laminated body or a winding body (not shown in the figure) and an electrolyte.
  • the wound body is made by a winding process
  • the lamination body is made by a lamination process.
  • the laminated body (or wound body) mainly includes a first pole piece, a second pole piece, and a diaphragm layer spaced between every adjacent first pole piece and second pole piece, wherein the first pole piece, the second pole piece One of the dipole sheets is a positive electrode sheet, and the other is a negative electrode sheet.
  • the electrolyte can be a solid electrolyte or, but not limited to, an electrolyte.
  • the electrolyte is soaked in the laminated body (or winding body), specifically filled in the first pole piece, the second pole piece and the separator in the laminated body (or winding body). In the pores, and in the gap between any two of the first pole piece, the second pole piece, and the diaphragm.
  • the laminated body (or wound body) and the electrolyte filled therein are sealed in a sealed casing.
  • the sealed casing is composed of a metal casing 1 and a composite cover 2, and the metal casing 1 may be but not limited to a steel casing.
  • the metal shell 1 is a cavity, and an opening is arranged on the top of the metal shell 1 .
  • the composite cover 2 of this embodiment includes a cover outer plate 21 and a cover inner plate 22 made of metal materials.
  • a hole 24 is arranged on the cover outer plate 21, the aperture of the hole 24 is narrower than the outer diameter of the cover inner plate 22, the outer diameter of the cover inner plate 22 is narrower than the outer diameter of the cover outer plate 21, and the top of the cover inner plate 22
  • the surface and the bottom surface of the cover outer plate 21 are stacked on the bottom surface of the cover outer plate 21, the first insulating layer 23 is spaced between the cover inner plate 22 and the cover outer plate 21, and the two surfaces of the first insulating layer 23 are respectively opposite to it.
  • the surfaces of the cover inner plate 22 and the cover outer plate 21 are tightly bonded together.
  • the top surface outside the hole 24 of the cover inner plate 22 is in close contact with the bottom surface of the cover outer plate 21 through the first insulating layer 23. Part 24 is exposed or protruded to serve as an external electrode.
  • the first insulating layer 23 , the inner cover plate 22 and the outer cover plate 21 may be, but not limited to, thermally compounded so that the two surfaces of the first insulating layer 23 are heat-sealed and integrated at high temperature. Adopting the thermal composite sealing process is beneficial to ensure the sealing performance, and the process is simple and easy to realize, which is beneficial to popularization and application. And it is beneficial to the thinning design of the combination cover 2, so as to improve the effective utilization space of the lithium-ion battery and increase the capacity of the battery.
  • this embodiment further provides the preparation process of the composite cover 2, wherein the first insulating layer 23 is composed of a ring-shaped first insulating film layer and a ring-shaped second insulating film layer.
  • the annular first insulating film layer is placed on the bottom surface of the cover outer plate 21, so that the annular part of the inner circumference of the first insulating film layer protrudes in the hole 24 of the cover outer plate 21, and the laminated first insulating film layer
  • An insulating film layer and the outer cover plate 21 are placed on the thermal lamination equipment, and the insulating layer is thermally compounded and sealed on the bottom surface of the outer cover plate 21 by hot pressing, and then the annular second insulating film layer is laid on the top of the outer cover plate 21 surface, and the inner peripheral part of the second insulating film layer protrudes in the hole 24 of the cover outer plate 21, and the first insulating film layer and the second insulating film layer in the hole 24 of the cover outer plate 21 are attached to each other.
  • the cover inner plate 22 put the cover inner plate 22 on the second insulating film layer, facing the hole 24 of the cover outer plate 21, and the outer periphery of the second insulating film layer exceeds the outer periphery of the inner cover plate 22, and use thermal lamination equipment to heat press
  • the cover inner plate 22, the first insulating film layer, the second insulating film layer, and the cover outer plate 21 are stacked together from top to bottom, so that the two surfaces of the second insulating film layer are respectively in contact with the top surface of the cover outer plate 21, the cover
  • the bottom surface of the inner plate 22 is thermally compounded and sealed together, and the bottom surface of the second insulating film layer located in the hole 24 of the cover outer plate 21 is thermally compounded and sealed together with the top surface of the first insulating film layer located in the hole.
  • the thermal composite connection of the combination cover 2 is realized.
  • thermal lamination processes are used as illustrations, but in reality, it is possible, but not limited to, to stack the outer cover plate 21, the first insulating film layer 23, and the inner cover plate 22 from bottom to top, and then put them into thermal lamination equipment using relatively The high power and pressure make the colloids on the two surfaces of the first insulating film layer 23 hot-melt to seal and bond with the surfaces of the outer cover plate 21 and the inner cover plate 22 respectively, cool and solidify into shape, and achieve thermal compounding at one time.
  • first insulating layer 23 between the inner cover plate 22 and the outer cover plate 21 by injection molding, and the first insulating layer 23 and the inner cover plate 22 and the outer cover plate 21 on both sides of the first insulating layer 23 are sealed and combined into one overall.
  • the first tab (connected to the first pole piece) on the laminated body (or winding body) to the inner surface of the cover inner plate 22 located in the sealed case, and use the cover inner plate 22 as the lithium battery.
  • the first electrode of the ion battery; the second pole tab (connected with the second pole piece) on the laminated body (or winding body) is connected to the inner surface of the outer cover plate 21 located in the sealed casing or the second pole
  • the ear is connected to any inner surface of the metal casing 1, and the outer cover plate 21 and the metal casing 1 are used as the second electrode of the lithium-ion battery.
  • One of the first electrode and the second electrode is a positive electrode, and the other is a negative electrode.
  • the connection process can be realized by but not limited to laser welding.
  • the sealing connection of the technical solution of this implementation is more reliable, reducing or avoiding the storage or cycle of the button-type lithium-ion battery.
  • the final leakage risk improves the reliability and safety of the button lithium-ion battery.
  • the cover inner plate 22 is located inside the combined cover, and the cover outer plate 21 which is melt-sealed and combined with the metal material of the metal shell 1 is located outside the combined cover, when the button lithium ion battery is in use , the air pressure inside the metal shell 1 is relatively large, and there is an outward push pressure on the combined cover. Since the cover inner plate 22 faces inward, under the action of this pressure, the sealing between the cover inner plate 22 and the cover outer plate 21 Reinforcement. Compared with the technical solution in which the cover inner plate 22 faces outward, the solution of this embodiment is beneficial to strengthen the sealing performance of the combined cover and improve the sealing performance of the lithium-ion battery.
  • annular protrusion 25 protruding toward the bottom surface is also provided on the bottom surface of the cover outer plate 21 in this embodiment.
  • the annular protrusion 25 is located outside the cover inner plate 22 and the first insulating layer 23, and is close to Cover the outer periphery of the outer plate 21 so that after the combined cover 2 is mounted on the opening of the metal shell 1 , the annular protrusion 25 is located in the metal shell 1 and has a narrow gap with the inner wall of the metal shell 1 .
  • the annular protrusion 25 presses the laminated body or winding body near the inner wall of the metal shell 1 under the annular protrusion 25, ensuring that the laminated body or winding body at this position is far away from the outer cover plate 21 and
  • the connection position of the metal shell 1 has a predetermined distance, so as to avoid the high temperature heat conduction to the laminated body or the wound body when the metal shell 1 is welded around the outer periphery of the cover outer plate 21, causing the laminated body or the wound body to be damaged .
  • adopting the technical solution of this embodiment is beneficial to greatly reducing the defect rate of the button lithium ion battery.
  • the distance between the annular protrusion 25 disposed on the bottom surface of the cover outer plate 21 and the outer peripheral edge of the cover outer plate 21 is about 0.0.5mm
  • the width is about 0.1 ⁇ 0.5mm
  • the depth of the protrusion is about 0.1-0.5mm.
  • the annular protrusion 25 is located near the inner wall of the metal shell 1, and presses on the outer periphery of the laminated body or the winding body, reducing the occupation of the effective accommodation space of the stacked body or winding body, and Provides protection for laminates or rolls.
  • stamping process can be used, but not limited to, from the top of the cover outer plate 21 to a predetermined position from the outer peripheral edge of the cover outer plate 21, and punch from top to bottom to form a ring on the top surface of the cover outer plate 21.
  • the groove correspondingly, forms an annular protrusion 25 on the bottom surface.
  • the electrolyte can be soaked into the stacked body (or wound body) before sealing the combined cover 2 , and the process can be but not limited to a soaking process or a liquid injection process.
  • the liquid injection process can be performed after the combined cover 2 is sealed, for example, a liquid injection hole 27 is provided on the inner plate 22 of the cover.
  • a liquid injection hole 27 is provided on the inner plate 22 of the cover.
  • the electrodes of the laminated body (or winding body) are connected to the cover outer plate 21 and the cover inner plate 22 of the combined cover 2 respectively.
  • the sealing nail referred to as the first sealing nail 26
  • the shape of the hole diameter of the liquid injection hole 27 is not limited, and the maximum point of the hole diameter is equal to or greater than 0.5 millimeters, and is equal to or less than 3 millimeters.
  • the first sealing nail 26 and the metal material outside the liquid injection hole 27 can be melted and sealed together by welding to realize the sealing of the liquid injection port. seal.
  • the metal shell 1 and the combination cover 2 are integrated and hermetically connected by metal fusion bonding, and the sealing reliability is strong.
  • a vacuum hole (not shown) can be further set on the shell wall of the metal casing 1 of the lithium ion battery of this embodiment, and the position of the vacuum hole can be aligned with the liquid injection hole 27 On the same end face or surface, or not on the same end face or surface.
  • the position of the vacuum hole is designed to be opposite to the position of the liquid injection hole 27 .
  • the vacuum hole is designed on the bottom cover of the metal housing 1;
  • the hole is designed on the combination cover 2; for example, when the liquid injection hole 27 is located on the side wall of the metal housing 1, the vacuum hole is designed on the side wall of the metal housing 1 opposite to the liquid injection hole 27 superior.
  • the cavity in the sealed housing is evacuated at the vacuum hole at the same time, so as to accelerate the full penetration of the electrolyte in the cavity, improve the infiltration effect of the electrolyte, and improve the efficiency of the injection. efficiency.
  • the liquid injection hole 27 and the vacuum hole are sealed, and the sealing process of the vacuum hole can be but not limited to the packaging process with the liquid injection hole 27, and can be but not limited to the use of sealing nails (referred to as the second sealing nails) ) Laser welding process is realized.
  • the shape of the diameter of the vacuum hole is not limited, and the maximum diameter of the hole is equal to or greater than 0.1 mm and equal to or less than 2 mm.
  • the electrolyte is poured into the sealed casing through the liquid injection hole 27 after sealing the laminated body (or winding body), so as to avoid the contamination of the sealed casing by the electrolyte before sealing, and improve the performance of the sealed casing.
  • the accuracy and controllability of the perfusion volume of the electrolyte perfusion improves the efficiency of the process.
  • the sealing of the liquid injection hole 27 in this embodiment is integrated by metal fusion, and the sealing reliability is stronger.
  • This embodiment provides a button-type lithium-ion battery, which mainly includes: a battery body and a sealed case for assembling the battery body.
  • the sealed casing includes: a metal casing 1 with an opening at the top, and a composite cover arranged on the opening of the metal casing 1 .
  • the battery body is sealed in the casing.
  • the battery body includes: a laminated body (or winding body) and an electrolyte filled in the laminated body (or winding body).
  • the electrolyte can be a solid electrolyte or a liquid electrolyte but not limited to.
  • the laminated body (or wound body) is composed of a first pole piece, a second pole piece, and a diaphragm spaced between adjacent first pole pieces and second pole pieces. Wherein, one of the first pole piece and the second pole piece is a positive pole piece, and the other is a negative pole piece.
  • the combined cover includes: a cover inner plate 22, a cover outer plate 21 and a first insulating adhesive layer 23, wherein the cover outer plate 21 and the first insulating adhesive layer 23 are ring-shaped with a through hole in the center, and the hole of the cover outer plate 21 The portion is not smaller than the central through hole of the first insulating adhesive layer 23, so that the inner edge of the first insulating adhesive layer 23 protrudes into the hole of the cover outer plate 21 during stacking.
  • the outer cover plate 21 and the inner cover plate 22 are respectively located on the two surfaces of the first insulating adhesive layer 23, and the colloids on the two surfaces of the first insulating adhesive layer 23 are respectively sealed and combined with the outer cover plate 21 and the inner cover plate 22 attached thereto. .
  • the surface (referred to as the top surface) of the cover inner plate 22 facing the cover outer plate 21 is exposed from the central through hole of the first insulating adhesive layer 23 .
  • the first insulating adhesive layer 23 can be heat-melt the colloids on the two surfaces of the first insulating adhesive layer 23 to make full contact with the surfaces of the outer cover plate 21 and the inner cover plate 22 facing it, and seal and combine them into one body after cooling. It is also possible, but not limited to, to put the cover outer plate 21 and the cover inner plate 22 into a predetermined mold when the first insulating adhesive layer 23 is prepared by injection molding, and the hot melt adhesive is fully in contact with the surfaces of the cover outer plate 21 and the cover inner plate 22 in the mold. After contacting, cooling and shaping, the first insulating adhesive layer 23 sealed and bonded between the cover outer plate 21 and the cover inner plate 22 is obtained, that is, the composite cover is obtained.
  • the inner cover plate 22 is located on the inner periphery of the outer cover plate 21, and the first insulating adhesive layer 23 is spaced between the inner cover plate 22 and the outer cover plate 21 and is sealed and connected with the inner cover plate 22 and the outer cover plate 21 respectively, so as to
  • the cover inner plate 22 and the cover outer plate 21 are hermetically connected to form a combined cover and provide insulation for the two.
  • the outer circumference of the combination cover is the outer circumference of the cover outer plate 21 , and the outer circumference of the cover outer plate 21 is sealed and connected with the opening of the metal shell 1 to realize the sealing connection between the combined cover and the metal shell 1 .
  • An explosion-proof portion 211 is also provided on the cover outer plate 21 in this embodiment, where the explosion-proof portion 211 can be a thinned portion or a hole.
  • a through hole that penetrates up and down can be set at the position where the cover outer plate 21 does not exceed the edge of the cover inner plate 22 as the explosion-proof portion 211, the first insulating adhesive layer 23 and the cover on the other side of the first insulating adhesive layer 23.
  • the plate 22 is blocked on the through hole, and the metal material thickness of the composite cover here is the thickness of the inner plate 22 of the cover.
  • a thinned part with a thickness thinner than that of other positions of the covered outer plate 21 can be set at the position beyond the edge of the covered inner plate 22 of the covered outer plate 21 as the explosion-proof part 211, and the bottom of the thinned part can be, but not limited to, sealed.
  • a first insulating glue layer 23 Combined with a first insulating glue layer 23 .
  • the position of the thinned portion can also be, but not limited to, located outside the outer edge of the first insulating glue layer 23 .
  • At least two explosion-proof parts 211 are provided on the cover outer plate 21, which are distributed in different positions of the combined cover, and may be but not limited to be symmetrically distributed with respect to the center of the combined cover.
  • a through hole or a thinned part is provided as the explosion-proof part 211, so that the airtightness of the button lithium ion battery is not affected.
  • the safety of the button lithium-ion battery is improved to avoid explosion.
  • punching is used to form through holes on the cover outer plate 21 or laser thinning (the laser intensity is set to a predetermined intensity, and the sintering time is controlled at a certain length of time, so that the laser sintering position of the cover outer plate 21
  • the top metal material is melted and the sintered part is thinned, but the metal at the bottom of the cover outer plate 21 remains non-melted to avoid the formation of through holes), and the design and preparation cost of the explosion-proof part 211 is low. It is beneficial to reduce the production cost.
  • the diameter of the through hole designed in the center of the first insulating adhesive layer 23 can be designed to be smaller than the diameter of the hole of the outer plate 21 of the cover, so that the inner edge of the first insulating adhesive layer 23 exceeds the inner edge of the cover.
  • the hole portion of the outer panel 21 and the top of the inner panel 22 are exposed from the central through hole of the first insulating adhesive layer 23 . Adopting this structure is beneficial to further improve the insulation and sealing performance between the cover outer plate 21 and the cover inner plate 22 .
  • a liquid injection hole penetrating through the inner cover plate 22 is provided on the exposed top of the inner cover plate 22 , and the liquid injection hole penetrates inside and outside the sealed housing.
  • the electrolyte is poured through the liquid injection hole.
  • the sealing nail 3 is covered on the top surface of the liquid injection hole, and the sealing nail 3 completely covers the liquid injection. Holes, from the top surface of the sealing nail 3 seal and weld the sealing nail 3 and the top surface of the cover inner plate 22 to form a closed ring laser welding track 31, and the liquid injection hole is located in the laser welding track 31.
  • a boss 221 protruding to the top is provided on the top surface of the inner cover plate 22.
  • the top surface of the boss 221 is a plane.
  • the inner cover plate 22 is positioned at the bottom surface of the outer cover plate 21.
  • the boss 221 on the top surface of the inner cover plate 22 protrudes from the central through hole of the first insulating adhesive layer, and is equal to or slightly higher than the top surface of the first insulating adhesive layer 23 . It is possible but not limited to provide the liquid injection hole on the boss 221 , at this time, the sealing nail 3 covers the top surface of the boss 221 .
  • this embodiment also provides a technical solution that is conducive to enhancing the sealing of the combined cover, which can be arranged on the bottom surface of the inner panel of the cover and the top surface of the outer panel of the cover, and on the two opposite surfaces.
  • dimples rules with regular or irregular shapes that are recessed inward relative to the surface
  • the evenly distributed area of the dimples is the area where the inner cover plate, the outer cover plate and the first insulating layer are in contact.
  • the colloid on both surfaces of the first insulating layer 23 is filled with concave grooves, the first insulating layer 23 is fully sealed and combined with the inner cover plate 22 and the outer cover plate 21 respectively, and the first insulating layer 23 and the inner cover plate 22,
  • the bonding area of the cover outer plate 21 improves the sealing connection strength between the three, and improves the sealing performance of the button lithium ion battery.
  • the dimples in this embodiment may be, but not limited to, a plurality of concentric or non-concentric rings.
  • the depression depth of the dimples may be, but not limited to, 0.01mm, 0.05mm, 0.1mm.
  • the first insulation layer 23 is sealed and bonded together with the cover inner panel 22 and the cover outer panel 21 by adopting thermal lamination process
  • a certain temperature and a certain pressure act on the cover inner panel 22
  • the first insulating layer 23 and the cover outer plate 21 make the colloid on the two surfaces of the first insulating layer 23 thermally melt into a fluid under the action of heat, and the surface of the cover inner plate 22 and the cover outer plate 21 in contact with the fluid is fully contacted, and Also fully enter the concave grooves and fully fill the concave grooves.
  • the first insulating layer 23 is sealed and combined with the cover inner plate 22 and the cover outer plate 21 on both sides to form an integrated composite cover.
  • the button-type lithium-ion battery of this embodiment can be used as a rechargeable power source for various electronic products, such as but not limited to smart wearable products such as wireless bluetooth earphones.

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Abstract

一种扣式锂离子电池及电子产品,包括电池本体及密封壳体,密封壳体，包括一体化的具有一开口的金属壳体，组合盖包括金属材料制成的盖内板、盖外板，盖外板上设置孔部，盖内板的外径宽于孔部的直径且窄于盖外板的外径，在盖内板与盖外板之间间隔有第一绝缘层，盖内板的位于孔部外的顶面紧贴盖外板的底面，盖内板的位于孔部内的顶面从孔部露出于顶部，盖外板、盖内板的底面朝向叠片体或卷绕体的密封空间，盖外板的外周与金属壳体的开口处的金属材料熔融密封结合，盖内板与第一极片的极耳电连接，以作为电池的第一电极，盖外板或金属壳体与第二极片的极耳电连接，以作为电池的第二电极应用该技术方案有利于降低锂离子电池的不良率。

Description

扣式锂离子电池及电子产品 技术领域
本发明涉及锂离子电池领域，尤其涉及一种扣式锂离子电池及电子产品。
背景技术
随着智能穿戴产品的应用越来越广泛，人们对于小体积的锂离子扣式二次可充电电池(简称扣式锂离子电池)的需求也越来越广。扣式锂离子电池越来越多的应用于智能穿戴产品，比如用于无线蓝牙耳机等，随着扣式锂离子电池的应用越来越广，比如耳机等，对电池的要求也越来越高。
发明内容
本发明实施例的目的之一在于提供一种锂离子电池及适用于锂离子电池的组合盖，应用该技术方案有利于降低锂离子电池的不良率。
第一方面，本发明实施例提供的一种扣式锂离子电池，包括：
电池本体，包括叠片体或卷绕体及电解质，
所述叠片体或卷绕体包括第一极片、第二极片，在每相邻的所述第一极片、第二极片之间间隔有隔膜，所述第一极片、第二极片的其中之一为正极片，另一为负极片，所述电解质在所述叠片体或卷绕体内的各所述第一极片、第二极片以及隔膜内的孔隙内，以及在所述第一极片、第二极片、隔膜的任意两者之间的间隙之间；
密封壳体，包括一体化的具有一开口的金属壳体，在所述金属壳体的开口处设置有组合盖，所述电池本体密封在所述金属壳体与所述组合盖构成的空间内，
所述组合盖包括金属材料制成的盖内板、盖外板，所述盖外板上设置孔部，
所述盖内板的外径宽于所述孔部的直径且窄于所述盖外板的外径，在所述盖内板与盖外板之间间隔有第一绝缘层，所述盖内板的位于所述孔部外的顶面紧贴所述盖外板的底面，所述盖内板的位于所述孔部内的顶面从所述孔部露出于顶部，
所述盖外板、盖内板的底面朝向所述叠片体或卷绕体的密封空间，所述盖外板的外周与所述金属壳体的开口处的金属材料熔融密封结合，
所述盖内板与所述第一极片的极耳电连接，以作为电池的第一电极，
所述盖外板或所述金属壳体与所述第二极片的极耳电连接，以作为所述电池的第二电极。
由上可见，采用本实施例技术方案，由于在盖内板位于组合盖的内侧，与金属壳体的开口处的金属金属材料熔融密封结合的盖外板位于组合盖的外侧，在扣式锂离子电池使用过程时，金属壳体1的内部的气压较大，对组合盖有向外推进的压力，由于盖内板朝内，在该压力作用下，盖内板与盖外板之间的密封性加强，相对于盖内板朝外的技术方案，采用本实施例方案有利于加强组合盖的密封性，提高锂离子电池的密封性，降低不良率。
另外，在本实施例的盖外板的底面还设置有向底面凸起的环形凸起，该环形凸起位于盖内板、绝缘层外且靠近盖外板的外周，在组合盖装于金属壳体的开口后，该环形凸起位于金属壳体内，与金属壳体的内壁具有狭小的间隙，此时，环形凸起将靠近金属壳体的内壁处的叠片体或卷绕体压于环形凸起的下方，确保该位置的叠片体或卷绕体距离盖外板与金属壳体的连接位置具有预定的距离，避免在围绕盖外板的外周焊接金属壳体时的高温热量传导至叠片体或卷绕体而导致叠片体或卷绕体受损。实验证明，采用本实施例技术方案有利于大大降低扣式锂离子电池的不良率。
另外，本实施例扣式锂离子电池的组合盖的外周与金属壳体的开口采用金属熔融结合连接，将叠片体(或卷绕体)以及电解液密封在密封壳体内，相对于现有技术的通过内外金属壳体压缩位于他们之间的密封圈而实现壳体密封的技术方案，本实施技术方案的密封连接更加可靠，降低或避免扣式锂离子电池存放或循环后的漏液风险，提高了扣式锂离子电池的可靠性及安全性。
另外，本实施例组合盖通过绝缘层与盖外板、盖内板的热复合通过绝缘层与盖外板、盖内板的热复合密封结合而将盖外板、盖内板绝缘组合成一体，三者牢牢密封结合在一起，确保密封性，且工艺简便易于实现，特别有利于推广应用。并且特别适用于组合盖的薄型化设计，以提高锂离子电池的有效利用空间，提高电池的容量。
附图说明
此处所说明的附图用来提供对本发明的进一步理解，构成本申请的一部分，并不构成对本发明的不当限定，在附图中：
图1为本发明实施例1提供的一种扣式锂离子电池的侧视结构示意图；
图2为图1所示电池的俯视结构示意图；
图3为图1所示电池的立体结构示意图；
图4为本发明实施例1提供的一种组合盖的俯视结构示意图；
图5为本发明实施例1提供的一种组合盖的仰视结构示意图；
图6为本发明实施例1提供的一种组合盖的侧视结构示意图；
图7为本发明实施例1提供的一种组合盖的立体结构示意图；
图8为本发明实施例1提供的一种盖外板的俯视结构示意图；
图9为本发明实施例1提供的一种盖外板的仰视结构示意图；
图10为本发明实施例1提供的一种盖外板的侧视结构示意图；
图11为本发明实施例1提供的一种盖内板的俯视结构示意图；
图12为本发明实施例1提供的一种盖内板的仰视结构示意图；
图13为本发明实施例1提供的一种盖内板的侧视结构示意图；
图14为本发明实施例1提供的一种绝缘层的俯视及仰视结构示意图；
图15为本发明实施例1提供的一种绝缘层的侧视结构示意图；
图16为本发明实施例1提供的一种密封钉的俯视以及仰视结构示意图；
图17为本发明实施例1提供的一种密封钉的侧视结构示意图；
图18为本发明实施例2提供的一种扣式锂离子电池的俯视示意图；
图19为图17所示扣式锂离子电池的A-A剖视结构示意图；
图20为本发明实施例2提供的另一种扣式锂离子电池的俯视示意图；
图21为图19所示扣式锂离子电池的A-A剖视结构示意图；
图22为图17、18所示的扣式锂离子电池的侧视结构示意图；
图23为本发明实施例2提供的一种盖内板的仰视结构示意图；
图24为本发明实施例2提供的一种盖内板的俯视结构示意图；
图25为本发明实施例2提供的一种盖内板的剖视结构示意图；
图26为本发明实施例2提供的一种盖外板的俯视结构示意图；
图27为本发明实施例2提供的一种盖外板的仰视结构示意图。
附图标记：
1：金属壳体；        2：组合盖；       21：盖外板；   22：盖内板；
23：第一绝缘层；     24：孔部；        25：环形凸起；
26：第一密封钉；     27：注液孔；
11：防爆部；         221：凸台；       3：密封钉；
31：激光焊接轨迹；    4：凹纹。
具体实施方式
下面将结合附图以及具体实施例来详细说明本发明，在此本发明的示意性实施例以及说明用来解释本发明，但并不作为对本发明的限定。
实施例1：
参见图1-17。
本实施例提供了一种扣式锂离子电池，其主要包括电池本体以及装配电池本体的密封壳体。电池本体的核心为叠片体或卷绕体(图中未画出)及电解质。其中卷绕体采用卷绕工艺制成，叠片体采用叠片工艺制成。叠片体(或卷绕体)主要包括第一极片、第二极片以及间隔在每相邻的第一极片、第二极片之间的隔膜层，其中，第一极片、第二极片的其中之一为正极片，另一为负极片。
电解质可以为固态电解质也可以但不限于为电解液。当采用电解液时，电解液浸泡在叠片体(或卷绕体)中，具体是充盈在叠片体(或卷绕体)内的各第一极片、第二极片以及隔膜内的孔隙内，以及在第一极片、第二极片、隔膜的任意两者之间的间隙之间。
叠片体(或卷绕体)以及充盈在其中的电解质密封在一密封壳体内。其中，密封壳体由一金属壳体1和组合盖2构成，金属壳体1可以但不限于为钢壳。金属壳体1为一腔体，在金属壳体1的顶部设置有一开口。
本实施例的组合盖2包括由金属材料制成的盖外板21、盖内板22。在盖外板21上设置有一孔部24，孔部24的孔径窄于盖内板22的外径，盖内板22的外径窄于盖外板21的外径，盖内板22的顶面与盖外板21的底面相对地叠在盖外板21的底面，第一绝缘层23间隔在盖内板22与盖外板21之间，第一绝缘层23的两表面分别与其正对的盖内板22、盖外板21的表面密封紧贴在一起。盖内板22的位于孔部24外的顶面与盖外板21的底面通过第一绝缘层23密封紧贴，盖内板22的位于孔部24内的顶面从盖外板21的孔部24露出或伸出，以作为对外的电极。
作为本实施例的示意，第一绝缘层23与盖内板22、盖外板21可以但不限于通过热复合使第一绝缘层23两表面在高温下热熔密封结合成一体。采用热复合密封工艺有利于确保密封性，且工艺简便易于实现，有利于推广应用。并且有利于组合盖2的薄型化设计，以提高锂离子电池的有效利用空间，提高电池的容量。
作为本实施例的示意，本实施例还进一步提供了组合盖2的制备工艺，其中第一绝缘 层23由环形的第一绝缘膜层以及环形的第二绝缘膜层组成。在制备时，将环形的第一绝缘膜层置于盖外板21的底面，使第一绝缘膜层的内周的环形部分伸出在盖外板21的孔部24内，将层叠的第一绝缘膜层、盖外板21置于热复合设备上，通过热压将绝缘层热复合密封结合在外盖板21的底面，然后将环形的第二绝缘膜层铺设在盖外板21的顶面，且第二绝缘膜层的内周部分伸出在盖外板21的孔部24内，位于盖外板21的孔部24内的第一绝缘膜层以及第二绝缘膜层面对面相贴，将盖内板22置于第二绝缘膜层上，正对盖外板21的孔部24上，且第二绝缘膜层的外周超出盖内板22的外周，采用热复合设备热压自上而下层叠在一起的盖内板22、第一绝缘膜层、第二绝缘膜层、以及盖外板21，使第二绝缘膜层的两表面分别与盖外板21的顶面、盖内板22的底面热复合密封结合在一起，位于盖外板21的孔部24内的第二绝缘膜层的底面与位于孔内的第一绝缘膜层的顶面热复合密封结合成一体。以上，即实现了组合盖2的热复合连接。
本实施例以两次热复合工艺实现为示意，但实际可以但不限于将盖外板21、第一绝缘膜层23、盖内板22自下而上层叠后，置入热复合设备采用较大的功率以及压力，使第一绝缘膜层23的两表面的胶体热熔而分别与盖外板21、盖内板22的表面密封粘结在一起，冷却固化成型，一次热复合实现。
也可以但不限于通过铆钉将盖内板22、盖外板21以及两者之间的第一绝缘膜层23牢牢锁紧在一起，使位于盖内板22、盖外板21之间的第一绝缘层23呈压缩状态，与盖内板22、盖外板21密封紧贴。
还可以但不限于通过注塑的工艺，在盖内板22、盖外板21之间注塑形成第一绝缘层23，第一绝缘层23与其两边的盖内板22、盖外板21密封结合成一整体。
在装配时，将叠片体(或卷绕体)上的第一极耳(与第一极片连接)连接到盖内板22的位于密封壳体内的内表面，以盖内板22作为锂离子电池的第一电极；将叠片体(或卷绕体)上的第二极耳(与第二极片连接)连接到盖外板21的位于密封壳体内的内表面或者将第二极耳连接到金属壳体1的任一处内表面上，以盖外板21以及金属壳体1作为锂离子电池的第二电极。其中第一电极、第二电极的其中之一为正极，另一为负极。
在将叠片体(或卷绕体)装配至金属壳体1内，并且完成第一电极、第二电极与盖外板21、盖内板22的连接后，将组合盖2密封于金属壳体1的开口上，具体是将组合盖2上的盖外板21的外周与金属壳体1的开口处的金属材料熔融密封结合成一体实现了组合盖2与金属壳体1之间的密封连接，其连接工艺可以但不限于采用激光焊实现。
相对于现有技术的通过内外金属壳体1压缩位于他们之间的密封圈而实现壳体密封的 技术方案，本实施技术方案的密封连接更加可靠，降低或避免扣式锂离子电池存放或循环后的漏液风险，提高了扣式锂离子电池的可靠性及安全性。
采用本实施例技术方案，由于在盖内板22位于组合盖的内侧，与金属壳体1金属金属材料熔融密封结合的盖外板21位于组合盖的外侧，在扣式锂离子电池使用过程时，金属壳体1的内部的气压较大，对组合盖有向外推进的压力，由于盖内板22朝内，在该压力作用下，盖内板22与盖外板21之间的密封性加强，相对于盖内板22朝外的技术方案，采用本实施例方案有利于加强组合盖的密封性，提高锂离子电池的密封性。
作为本实施例的示意，在本实施例的盖外板21的底面还设置有向底面凸起的环形凸起25，环形凸起25位于盖内板22、第一绝缘层23外，且靠近盖外板21的外周，以使在组合盖2装于金属壳体1的开口后，该环形凸起25位于金属壳体1内，且与金属壳体1的内壁具有狭小的间隙。此时，环形凸起25将靠近金属壳体1的内壁处的叠片体或卷绕体压于环形凸起25的下方，确保该位置的叠片体或卷绕体距离盖外板21与金属壳体1的连接位置具有预定的距离，避免在围绕盖外板21的外周焊接金属壳体1时的高温热量传导至叠片体或卷绕体而导致叠片体或卷绕体受损。实验证明，采用本实施例技术方案有利于大大降低扣式锂离子电池的不良率。
作为本实施例的示意，设置于盖外板21的底面的环形凸起25与盖外板21的外周边缘之间的距离约0.～0.5mm，宽度约为0.1～0.5mm，凸起深度约0.1～0.3mm，环形凸起25位于金属壳体1的内壁的附近，压于叠片体或卷绕体的外周，减少对叠片体或卷绕体的有效容置空间的占用，并为叠片体或卷绕体提供保护。
作为本实施例的示意，可以但不限于采用冲压工艺，自盖外板21的顶部，距离盖外板21的外周边缘预定位置自上而下冲压，在盖外板21的顶面形成一环形凹槽，相应地，在底面形成一环形凸起25。
作为本实施例的示意，本实施例可以在密封组合盖2前将电解液浸润至叠片体(或卷绕体)内，其工艺可以但不限于采用浸泡工艺或者注液工艺。
另外，本实施例还可以在密封组合盖2后进行注液工艺，比如，在盖内板22上设置注液孔27。这样在将叠片体(或卷绕体)置入金属壳体1内后，将叠片体(或卷绕体)的电极与组合盖2的盖外板21、盖内板22分别连接后，将组合盖2密封连接在金属壳体1的开口上后，通过注液孔27向金属壳体1内注入定量的电解液，然后将密封钉(记为第一密封钉26)密封焊接封堵在密封注液孔27上，即得本实施例的扣式锂离子电池。其中注液孔27的孔径的形状不限，孔径的最大处等于或大于0.5毫米，等于或小于3毫米。
本实施例可以但不限于在注液孔27装入第一密封钉26后，通过焊接使第一密封钉26与注液孔27的外的金属材料熔融密封结合成一体，实现注液口的密封。本实施例的金属壳体1与组合盖2采用金属熔融结合呈一体而密封连接，密封可靠性强。
作为本实施例的示意，还可以在本实施例的锂离子电池的金属壳体1的壳壁上进一步设置抽真空孔(图中未画出)，抽真空孔的位置可以与注液孔27在同一个端面或曲面上，也可以不在同一端面或曲面上。优选地，将抽真空孔的位置设计为与注液孔27的位置相对。比如，当注液孔27位于组合盖2上时，将抽真空孔设计在金属壳体1的底盖上；反之，当注液孔27位于金属壳体1的底盖上时，将抽真空孔设计在组合盖2上；比如当注液孔27位于金属壳体1的侧壁上时，则将抽真空孔设计在金属壳体1的与注液孔27相对的另一侧的侧壁上。这样，在往注液孔27进行注液时，同时在抽真空孔对密封壳体内的腔体进行抽真空，以加速电解液在腔体内的充分渗透，提高电解液的浸润效果，提高注液效率。在注液后，对注液孔27以及抽真空孔进行密封，抽真空孔的密封工艺可以但不限于同注液孔27的封装工艺，可以但不限于采用密封钉(记为第二密封钉)激光焊接工艺实现。
其中抽真空孔的孔径的形状不限，孔径的最大处等于或大于0.1毫米，等于或小于2毫米。
作为本实施例的示意，本实施例在密封叠片体(或卷绕体)后通过注液孔27将电解液灌注至密封壳体内，避免在密封前电解液对密封壳体的污染，提高电解液灌注的灌注量的精确度和可控性，提高了工艺的效率。另外本实施例的注液孔27的密封采用金属熔融结合成一体，密封可靠性更强。
实施例2：
参见图18-27。
本实施例提供了一种扣式锂离子电池，其主要包括：电池本体以及装配电池本体的密封壳体。其中密封壳体包括：顶部为开口的金属壳体1、及设置在金属壳体1的开口上的组合盖。
其中，电池本体密封在壳体内。电池本体包括：叠片体(或卷绕体)以及充盈在叠片体(或卷绕体)中的电解质，该电解质可以为固态电解质也可以但不限于为液态电解液。叠片体(或卷绕体)由第一极片、第二极片以及间隔在相邻的第一极片、第二极片之间的隔膜组成。其中，第一极片、第二极片的其中之一为正极片，另一为负极片。
组合盖包括：盖内板22、盖外板21以及第一绝缘胶层23，其中，盖外板21以及第一绝缘胶层23均为中心为通孔的环形，且盖外板21的孔部不小于第一绝缘胶层23的中心通孔， 使在层叠时，第一绝缘胶层23的内沿伸出在盖外板21的孔部内。盖外板21、盖内板22分别位于第一绝缘胶层23的两表面，第一绝缘胶层23的两表面的胶体分别与其相贴的盖外板21、盖内板22密封结合成一体。盖内板22的朝向盖外板21侧的表面(记为顶面)从第一绝缘胶层23的中心通孔露出。
其中可以但不限于通过热压使第一绝缘胶层23的两表面的胶体热熔而与其正对的盖外板21、盖内板22的表面充分接触在冷却后密封结合成一体。也可以但不限于在注塑制备第一绝缘胶层23时将盖外板21、盖内板22置入预定的模具，热熔胶体在模具中与盖外板21、盖内板22的表面充分接触，冷却定型后得到密封结合在盖外板21、盖内板22之间的第一绝缘胶层23，即得组合盖。
盖内板22位于盖外板21的内周，第一绝缘胶层23间隔在盖内板22、盖外板21之间且分别与盖内板22、盖外板21密封连接在一起，以将盖内板22、盖外板21密封连接成组合盖整体且为两者提供绝缘隔离。组合盖的外周为盖外板21的外周，盖外板21的外周与金属壳体1的开口密封结合连接，实现了组合盖与金属壳体1的密封连接。
在本实施例的盖外板21上还设置有防爆部211，其中防爆部211可以位置为减薄部、也可以设置为孔部。
比如，可以在盖外板21未超出盖内板22的边沿的位置设置上下贯穿的通孔作为防爆部211，第一绝缘胶层23以及位于第一绝缘胶层23的另一侧的盖内板22封堵在通孔上，该处的组合盖的金属材料厚度为盖内板22的厚度。
比如，可以在盖外板21的超出盖内板22的边沿的位置设置厚度薄于盖外板21的其他位置的厚度的减薄部作为防爆部211，该减薄部下方可以但不限于密封结合有第一绝缘胶层23。该减薄部的位置还可以但不限于位于第一绝缘胶层23的外沿外。
作为本实施例的示意，在盖外板21上设置有至少两个防爆部211，分布于组合盖的不同位置，可以但不限于相对于组合盖的中心对称分布。
由上可见，在本实施例的扣式电池的组合盖的盖外板21上设置有通孔或减薄部作为防爆部211，使在不不影响扣式锂离子电池的气密性的前提下，提高了扣式锂离子电池的安全性，避免爆炸。且本实施例在盖外板21上，采用冲孔形成通孔或者采用激光减薄(将激光强度设定成预定的强度，烧结时间控制在一定的时长，使盖外板21的激光烧结位置的顶部金属材料熔融而烧结处减薄，但盖外板21底部金属保持非熔融状，避免形成通孔)，防爆部211的设计制备成本低。有利于降低生产成本。
作为本实施例的示意，可以但不限于使设计在第一绝缘胶层23的中心通孔的直径小于 盖外板21的孔部的直径，使第一绝缘胶层23的内沿超出在盖外板21的孔部，盖内板22的顶部从第一绝缘胶层23的中心通孔露出。采用该结构有利于进一步提高盖外板21、盖内板22之间的绝缘性以及密封性。
作为本实施例的示意，可以但不限于使设计在第一绝缘胶层23的外沿超出盖内板22的外沿，采用该结构有利于进一步提高盖外板21、盖内板22之间的绝缘性以及密封性。
作为本实施例的示意，在盖内板22露出在外的顶部还设置有贯穿盖内板22的注液孔，注液孔贯通密封壳体内外。这样，在将电池本体置入金属壳体，密封组合盖后，通过注液孔进行电解液灌注，在灌注完成后，在注液孔的顶面覆盖密封钉3，密封钉3完全覆盖注液孔，自密封钉3的顶面将密封钉3与盖内板22的顶面密封焊接，形成一封闭环状的激光焊接轨迹31，注液孔位于该激光焊接轨迹31内。
作为本实施例的示意，在盖内板22的顶面设置一向顶部凸起的凸台221，凸台221的顶面为平面，在装配时，盖内板22位于盖外板21的底面，盖内板22的顶面的凸台221从第一绝缘胶层的中心通孔伸出，与第一绝缘胶层23的顶面相平或略高于第一绝缘胶层23的顶面。可以但不限于将注液孔设置在该凸台221上，此时，密封钉3覆盖在该凸台221的顶面。
参见图23-27所示，本实施例还提供了一种有利于增强组合盖的密封性的技术方案，可以在盖内板的底面、盖外板的顶面，在该两相对的表面设置有凹纹(形状规则或不规则的相对于表面向内凹陷的纹路)，凹纹均匀分布区域为盖内板、盖外板与第一绝缘层相接触的区域。使第一绝缘层23的两表面的胶体充满凹纹，使第一绝缘层23分别与盖内板22、盖外板21充分密封结合在一起，增加第一绝缘层23与盖内板22、盖外板21的结合面积，提高三者之间的密封连接强度，提高扣式锂离子电池的密封性。作为本实施例的示意，本实施例的凹纹可以但不限于为复数个同心或不同心的环形。其中凹纹的凹陷深度可以但不限于为0.01mm、0.05mm、0.1mm。比如，当采用热复合工艺将第一绝缘层23与盖内板22、盖外板21密封结合在一起时，在以一定的温度一定的压力作用于面对面紧贴在一起的盖内板22、第一绝缘层23、盖外板21，使在热量作用下，第一绝缘层23两表面的胶体热熔成流体，流体与其接触的盖内板22、盖外板21的表面充分接触，且还充分进入凹纹且充分填满凹纹，在冷却定型后第一绝缘层23与其两边的盖内板22、盖外板21密封结合成一体，形成一体化的组合盖。
本实施例的扣式锂离子电池可以用于各种电子产品的可充电电源，比如但不限于应用于无线蓝牙耳机等智能穿戴产品。
以上所述的实施方式，并不构成对该技术方案保护范围的限定。任何在上述实施方式 的精神和原则之内所作的修改、等同替换和改进等，均应包含在该技术方案的保护范围之内。

Claims (25)

  1. 一种扣式锂离子电池，其特征是，包括：
    电池本体，包括叠片体或卷绕体及电解质，
    所述叠片体或卷绕体包括第一极片、第二极片，在每相邻的所述第一极片、第二极片之间间隔有隔膜，所述第一极片、第二极片的其中之一为正极片，另一为负极片，所述电解质在所述叠片体或卷绕体内的各所述第一极片、第二极片以及隔膜内的孔隙内，以及在所述第一极片、第二极片、隔膜的任意两者之间的间隙之间；
    密封壳体，包括一体化的具有一开口的金属壳体，在所述金属壳体的开口处设置有组合盖，所述电池本体密封在所述金属壳体与所述组合盖构成的空间内，
    所述组合盖包括金属材料制成的盖内板、盖外板，所述盖外板上设置孔部，
    所述盖内板的外径宽于所述孔部的直径且窄于所述盖外板的外径，在所述盖内板与盖外板之间间隔有第一绝缘层，所述盖内板的位于所述孔部外的顶面紧贴所述盖外板的底面，所述盖内板的位于所述孔部内的顶面从所述孔部露出于顶部，
    所述盖外板、盖内板的底面朝向所述叠片体或卷绕体的密封空间，所述盖外板的外周与所述金属壳体的开口处的金属材料熔融密封结合，
    所述盖内板与所述第一极片的极耳电连接，以作为电池的第一电极，
    所述盖外板或所述金属壳体与所述第二极片的极耳电连接，以作为所述电池的第二电极。
  2. 根据权利要求1所述的扣式锂离子电池，其特征是，
    在所述盖外板的底面还设置有向底面凸起的环形凸起，所述环形凸起位于所述盖内板以及第一绝缘层外且靠近所述金属壳体的内壁，所述叠片体或卷绕体压于所述环形凸起的下方而与所述盖外板与所述金属壳体的连接位置具有预定的间隙。
  3. 根据权利要求2所述的扣式锂离子电池，其特征是，
    所述环形凸起距离所述盖外板的外周边缘大于或等于0.1mm，小于或等于0.5mm。
  4. 根据权利要求2所述的扣式锂离子电池，其特征是，
    所述环形凸起的宽度大于或等于0.1mm，小于或等于0.5mm。
  5. 根据权利要求2所述的扣式锂离子电池，其特征是，
    所述环形凸起高于所述盖外板的底面的高度大于或等于0.1mm小于或等于0.3mm。
  6. 根据权利要求2所述的扣式锂离子电池，其特征是，
    所述环形凸起冲压形成在所述盖外板上。
  7. 根据权利要求2至6之任一所述的扣式锂离子电池，其特征是，
    在所述盖外板的顶面形成有凹于所述顶面的环形凹槽。
  8. 根据权利要求7所述的扣式锂离子电池，其特征是，
    所述环形凹槽的深度为大于或等于0.05mm小于或等于0.2mm。
  9. 根据权利要求1所述的扣式锂离子电池，其特征是，
    所述第一绝缘层的两表面分别与表面相对的所述盖内板、盖外板的表面热复合密封结合成一起。
  10. 根据权利要求1所述的扣式锂离子电池，其特征是，
    所述第一绝缘层为塑胶层，所述塑胶层注塑成型在所述盖内板、盖外板之间，与所述盖内板、盖外板形成一体。
  11. 根据权利要求1所述的扣式锂离子电池，其特征是，
    在所述金属壳体的壳壁上、或者在所述盖内板上，或者在所述盖外板位于所述盖内板外周的区域，还设置有注液孔，
    在所述注液孔内设置有第一密封钉，所述第一密封钉与所述注液孔的外周的金属材料熔融密封结合。
  12. 根据权利要求11所述的扣式锂离子电池，其特征是，
    在所述金属壳体的壳壁上、或者在所述盖内板上，或者在所述盖外板位于所述盖内板外周的区域，还设置有抽真空孔，
    在所述抽真空孔内设置有第二密封钉，所述第二密封钉与所述抽真空孔的外周的金属材料熔融密封结合。
  13. 根据权利要求1所述的扣式锂离子电池，其特征是，
    在所述盖外板上还设置有防爆部，所述组合盖在所述防爆部所在位置处的金属材料的厚度最薄。
  14. 根据权利要求13所述的扣式锂离子电池，其特征是，
    在所述盖外板上还设置有至少两防爆部。
  15. 根据权利要求14所述的扣式锂离子电池，其特征是，
    在所述盖外板上还设置有至少两防爆部。
  16. 根据权利要求13所述的扣式锂离子电池，其特征是，
    在所述盖外板上设置贯穿所述盖外板的通孔作为所述防爆部，
    所述第一绝缘胶层、盖内板的外周均超出各所述防爆部，与位于所述防爆部外的所述盖外板的底面密封结合。
  17. 根据权利要求13所述的扣式锂离子电池，其特征是，
    在所述盖外板上设置有减薄部，所述盖外板在各所述减薄部处的厚度最薄，
    各所述减薄部的正投影位置均位于所述盖内板的外周外。
  18. 根据权利要求13所述的扣式锂离子电池，其特征是，
    所述第一绝缘胶层的中心通孔的直径小于所述盖外板的孔部的直径，所述第一绝缘胶层的内沿位于所述盖外板的孔部内，所述盖内板的顶部从所述第一绝缘胶层的中心通孔内露出于顶部。
  19. 根据权利要求1所述的扣式锂离子电池，其特征是，
    在所述盖内板露出在外的顶部还设置有贯穿所述盖内板的注液孔，
    在所述盖内板的顶面还密封结合有密封钉，所述密封钉完全覆盖所述注液孔以密封所述注液孔。
  20. 根据权利要求11或18所述的扣式锂离子电池，其特征是，
    在所述密封钉的顶面形成有环形的激光焊接轨迹，在所述激光焊接轨迹处所述密封钉与紧贴于所述密封顶的底面的金属热熔密封结合在一起，所述注液孔位于所述激光焊接轨迹的内周。
  21. 根据权利要求11或19所述的扣式锂离子电池，其特征是，
    在所述盖内板的位于所述第一绝缘胶层的中心通孔内的顶面设置有一向顶部凸起的凸台，
    所述凸台的顶部高于所述第一绝缘胶层的顶面或相平于所述第一绝缘胶层的顶面，所述密封钉位于所述凸台的顶面。
  22. 根据权利要求1所述的扣式锂离子电池，其特征是，
    在所述盖内板、盖外板的与所述第一绝缘层相贴的表面还分别设置有凹纹，所述凹纹分布在与所述第一绝缘层接触的区域，
    所述第一绝缘层的两表面的胶体还充满各所述凹纹，所述第一绝缘层与所述盖内板、盖外板密封结合在一起。
  23. 根据权利要求22所述的扣式锂离子电池，其特征是，
    所述凹纹包括复数个环形。
  24. 根据权利要求22所述的扣式锂离子电池，其特征是，
    所述凹纹的凹陷深度为0.01mm～0.1mm。
  25. 一种电子产品，其特征是，所述电子产品的电源接口连接有权利要求1至21之任一所述的扣式锂离子电池。
    Figure PCTCN2022118277-appb-100001
PCT/CN2022/118277 2021-07-12 2022-09-10 扣式锂离子电池及电子产品 WO2023030547A1 (zh)

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