WO2023109467A1 - 一种电池 - Google Patents

一种电池 Download PDF

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Publication number
WO2023109467A1
WO2023109467A1 PCT/CN2022/134176 CN2022134176W WO2023109467A1 WO 2023109467 A1 WO2023109467 A1 WO 2023109467A1 CN 2022134176 W CN2022134176 W CN 2022134176W WO 2023109467 A1 WO2023109467 A1 WO 2023109467A1
Authority
WO
WIPO (PCT)
Prior art keywords
weld
conductive
sealing member
welding seam
injection hole
Prior art date
Application number
PCT/CN2022/134176
Other languages
English (en)
French (fr)
Inventor
王智峰
彭宁
Original Assignee
珠海冠宇电池股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 珠海冠宇电池股份有限公司 filed Critical 珠海冠宇电池股份有限公司
Priority to JP2023574279A priority Critical patent/JP2024521889A/ja
Priority to KR1020237041033A priority patent/KR20240001243A/ko
Priority to EP22906218.7A priority patent/EP4333170A1/en
Publication of WO2023109467A1 publication Critical patent/WO2023109467A1/zh
Priority to US18/527,173 priority patent/US20240113404A1/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
    • H01M50/183—Sealing members
    • H01M50/184—Sealing members characterised by their shape or structure
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
    • H01M50/109—Primary casings; Jackets or wrappings characterised by their shape or physical structure of button or coin shape
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/147—Lids or covers
    • 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
    • H01M50/15—Lids or covers characterised by their shape for prismatic or rectangular cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/147—Lids or covers
    • H01M50/148—Lids or covers characterised by their shape
    • H01M50/153—Lids or covers characterised by their shape for button or coin cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/147—Lids or covers
    • H01M50/166—Lids or covers characterised by the methods of assembling casings with lids
    • H01M50/169—Lids or covers characterised by the methods of assembling casings with lids by welding, brazing or soldering
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/183—Sealing members
    • H01M50/186—Sealing members characterised by the disposition of the sealing members
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/60—Arrangements or processes for filling or topping-up with liquids; Arrangements or processes for draining liquids from casings
    • H01M50/609—Arrangements or processes for filling with liquid, e.g. electrolytes
    • H01M50/627—Filling ports
    • H01M50/636—Closing or sealing filling ports, e.g. using lids
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/60—Arrangements or processes for filling or topping-up with liquids; Arrangements or processes for draining liquids from casings
    • H01M50/609—Arrangements or processes for filling with liquid, e.g. electrolytes
    • H01M50/627—Filling ports
    • H01M50/636—Closing or sealing filling ports, e.g. using lids
    • H01M50/645—Plugs
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2220/00—Batteries for particular applications
    • H01M2220/30—Batteries in portable systems, e.g. mobile phone, laptop
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • 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 present application relates to the technical field of batteries, in particular to a battery.
  • a battery is a component that converts chemical energy into electrical energy and has a wide range of applications in daily life and work.
  • button batteries are often used in various electronic devices such as electronic watches, Bluetooth headsets, and electric toys to provide power for electronic devices. Occupy a very important position in people's life and work.
  • the button battery includes a conductive shell and a cover plate assembly, the cover plate assembly and the conductive shell are surrounded to form a cavity, and an electrolyte is arranged in the cavity.
  • a liquid injection hole is opened on the cover plate assembly or the conductive housing, and the electrolyte is injected into the cavity through the liquid injection hole, and a seal is welded on the liquid injection hole to seal the liquid injection hole.
  • the welding between the sealing element and the cover plate assembly or the conductive shell adopts one-time welding, and the weld structure is formed at one time without stopping in the middle.
  • the whole welding process takes about 60 minutes from the beginning of the weld to the end of the weld. -70 milliseconds, so that a continuous circular weld seam will be formed on the seal, and in order to ensure the sealing, the beginning and end ends of the formed weld seam are usually partially overlapped.
  • the present invention provides a battery to solve the problem in the existing battery that heat accumulation in a welding seam structure is relatively high at one time, and yellowing or even explosion points are likely to occur at the head and tail ends of the welding seam, which affects the battery yield.
  • the present application provides a battery, including a conductive casing and a cover plate assembly, the cover plate assembly is covered on the conductive casing, the cover plate assembly and the conductive casing form a cavity, the conductive A liquid injection hole communicating with the cavity is opened on the housing or the cover plate assembly, and a seal is provided on the liquid injection hole to close the liquid injection hole;
  • a first welding seam and a second welding seam are respectively formed on the sealing member, the first welding seam has a first head end and a first tail end, and the second welding seam has a second head end and a second tail end end, the first head end is connected to the second tail end, the second head end is connected to the first tail end, and the seal passes through the first weld seam and the second weld seam It is connected with the conductive housing or the cover assembly.
  • the welding seam realizing the connection between the sealing member and the conductive top cover is two sections of welding seam, and the two sections of welding seam are respectively formed and connected end to end.
  • the seal is connected to the conductive top cover by welding, two sections of welds are formed on the seal and the conductive top cover by means of segmental welding.
  • the formation of the first weld and the second weld The seams can be formed at intervals of preset times.
  • the first weld can be fully cooled by heat dissipation, and then the second weld can be formed, thereby effectively reducing or avoiding the accumulation of heat, that is, reducing the heat of the weld.
  • the first weld and the second weld When the head and tail ends are connected, it can effectively reduce or avoid the occurrence of explosion points at the connection part, and effectively improve the yield rate of the battery.
  • it can also alleviate the heating of the electrolyte, reduce or avoid the vaporization of the electrolyte, thereby effectively preventing the yellowing at the end of the welding seam, and further improving the yield of the battery.
  • the cover plate assembly includes a conductive top cover and a cover plate, the cover plate is arranged on the conductive housing, and the conductive top cover is insulated on the cover plate, so The liquid injection hole is located on the conductive top cover, and the liquid injection hole runs through the conductive top cover.
  • the welding penetration of the first weld seam and the second weld seam is greater than the thickness of the sealing member and less than the sum of the thicknesses of the sealing member and the conductive shell ;
  • the welding penetration of the first weld and the second weld is greater than the thickness of the sealing member and less than the sum of the thicknesses of the sealing member and the conductive top cover.
  • both the first weld seam and the second weld seam are arc-shaped, and the first weld seam and the second weld seam are arranged concentrically.
  • the first head end partially overlaps the second tail end, and/or, the second head end partially overlaps the first tail end.
  • the sealing member includes a sealing portion and a connecting portion disposed around the outer periphery of the sealing portion, and the sealing portion is opposite to the liquid injection hole;
  • the thickness of the connecting portion is smaller than the thickness of the sealing portion, and the first welding seam and the second welding seam are located on the connecting portion.
  • the value range of the center angle of the overlapping portion between the first tail end and the second head end is 0°-30°;
  • the value range of the center angle of the overlapping portion of the second tail end and the first head end is 0°-30°.
  • the degree range of the central angle of the first welding seam is 180°-240°, and/or, the degree range of the central angle of the second welding seam is 120°-240° .
  • the inner diameter of the first weld is in the range of 3.6mm-4mm, and the outer diameter of the first weld is in the range of 4mm-4.4mm;
  • the inner diameter of the second weld is in the range of 3.6mm-4mm, and the outer diameter of the second weld is in the range of 4mm-4.4mm.
  • the surface of the conductive top cover facing away from the conductive housing has a first recessed portion, and the sealing member is located in the first recessed portion.
  • the first welding seam and the second welding seam have protrusions on the side of the sealing member facing away from the conductive housing, and the peaks of the protrusions are lower than the A side of the conductive top cover facing away from the conductive housing.
  • the first recessed portion further has a second recessed portion, and the liquid injection hole is located in the second recessed portion.
  • FIG. 1 is a schematic structural diagram of a battery provided in an embodiment of the present application.
  • Fig. 2 is an exploded schematic diagram of a battery structure provided by the embodiment of the present application.
  • Fig. 3 is an enlarged view of area A in Fig. 1;
  • FIG. 4 is a top view of a battery provided in an embodiment of the present application.
  • FIG. 5 is a schematic structural diagram of a conductive top cover provided in an embodiment of the present application.
  • Fig. 6 is a schematic structural diagram of a seal provided in an embodiment of the present application.
  • Fig. 7 is a schematic structural diagram of another seal provided in the embodiment of the present application.
  • Fig. 8 is a schematic diagram of a first weld seam and a second weld seam provided on another sealing member according to the embodiment of the present application.
  • FIG. 1 is a schematic diagram of a battery structure provided by an embodiment of the present application
  • FIG. 2 is an exploded schematic diagram of a battery structure provided by an embodiment of the present application.
  • the battery is a button battery as an example for illustration.
  • the cover assembly 20 may include a conductive top cover 21 and a cover plate 22 , the shape of the cover plate 22 is a ring structure, and the cover plate 22 may cover the conductive housing 10 .
  • the conductive top cover 21 is arranged on the cover plate 22, and the conductive top cover 21 and the cover plate 22 are insulated and connected, specifically, for example, a first insulating member 40 may be provided between the conductive top cover 21 and the cover plate 22, The first insulator 40 can insulate and isolate the conductive top cover 21 and the cover plate 22 to prevent the electrical contact between the conductive top cover 21 and the cover plate 22 to cause a short circuit of the battery 100 , thereby effectively improving the safety of the battery 100 .
  • a cell 60 and an electrolyte may also be provided in the cavity 11 of the battery 100 , and the cell 60 may undergo a chemical reaction in the electrolyte to generate electrical energy.
  • the battery cell 60 may include a positive pole tab 61 and a negative pole tab (not shown in the figure), wherein the positive pole tab 61 may be electrically connected to the conductive top cover 21, and the negative pole tab may be electrically connected to the conductive housing 10 to Let the conductive top cover 21 be the positive terminal of the battery 100 , and the conductive casing 10 be the negative terminal of the battery 100 .
  • the positive pole tab 61 may also be electrically connected to the conductive case 10, and the negative pole tab may be electrically connected to the conductive top cover 21, so that the conductive case 10 is the positive terminal of the battery 100, and the conductive top cover 21 is negative terminal of battery 100 .
  • the positive pole tab 61 is electrically connected to the conductive top cover 21
  • the negative pole tab is electrically connected to the conductive shell 10 as an example for illustration.
  • a second insulator 30 can also be arranged between the battery core 60 and the cover plate 22, and the second insulator 30 can insulate and isolate the battery core 60 and the positive pole tab 61 from the cover plate 22, so as to prevent the battery core 60 or the positive pole
  • the tab 61 is in electrical contact with the cover plate 22 , reducing or avoiding the short circuit of the battery 100 caused by the electrical contact between the cell 60 or the positive tab 61 and the cover plate 22 , and further improving the safety of the battery 100 .
  • a liquid injection hole 23 is also provided on the conductive housing 10 or the cover assembly 20 , that is, the liquid injection hole 23 can be provided on the conductive housing 10 , or the liquid injection hole 23 can also be provided on the cover assembly 20 . Wherein, the liquid injection hole 23 communicates with the cavity 11 of the battery 100, and the electrolyte can be injected into the cavity 11 through the liquid injection hole 23.
  • a sealing member 50 is also provided on the liquid injection hole 23, and the sealing member 50 is used to close the liquid injection hole 23 to prevent leakage of the electrolyte.
  • the function of the sealing member 50 is to close the liquid injection hole 23, therefore, the setting position of the sealing member 50 is related to the opening position of the liquid injection hole 23, that is, when the liquid injection hole 23 is opened in the cover plate assembly 20 , the sealing member 50 can be arranged on the cover assembly 20 , and when the liquid injection hole 23 is opened on the conductive casing 10 , the sealing member 50 can be arranged on the conductive casing 10 .
  • the seal is usually welded on the conductive shell or cover plate assembly.
  • the seal and the conductive top cover are connected by a continuous circular weld, wherein the weld is welded once more
  • the method is carried out, that is, the weld structure is formed at one time, without stopping in the middle, and usually the entire welding process only takes 60-70 milliseconds from the beginning to the end. In order to ensure airtightness, the ends of the weld seams will be connected or even partially overlapped.
  • the weld structure is formed at one time in a very short period of time, the heat accumulation is high, and the electrolyte in the battery case is likely to be vaporized due to heat, resulting in yellowing at the beginning and end of the weld.
  • the head and tail ends of the weld seam are connected or overlapped and the weld seam formation time is short, and the heat dissipation time of the head end is short. Without effective heat dissipation, the head end and the tail end are connected or overlapped, and it is easy to make the weld seam at the head and tail ends. Explosion points will occur at the parts where the ends meet or overlap, which will seriously affect the yield of the battery.
  • an embodiment of the present application provides a battery, which can effectively reduce the heat accumulation of the weld, reduce or avoid yellowing or bursting at the beginning and end of the weld, and effectively improve the yield of the battery.
  • FIG. 3 is an enlarged view of area A in FIG. 1
  • FIG. 4 is a top view of a battery provided in an embodiment of the present application.
  • a first weld 70 and a second weld 80 are respectively formed on the sealing member 50, wherein the first weld 70 and the second weld 80 can pass through Formed by laser welding.
  • the first welding seam 70 has a first head end 71 and a first tail end 72
  • the second welding seam 80 has a second head end 81 and a second tail end 82 .
  • the first head end 71 is connected to the second tail end 82
  • the second head end 81 is connected to the first tail end 72, that is, the first welding seam 70 and the second welding seam 80 are connected in turn, so that the first welding seam 70 and the second weld 80 are combined by splicing to form a closed weld.
  • Both the first welding seam 70 and the second welding seam 80 extend from the sealing member 50 to the conductive housing 10 or the cover assembly 20 , that is, the penetration depth of the first welding seam 70 and the second welding seam 80 is greater than that of the sealing member 50 The thickness is so that the sealing member 50 can be connected with the conductive housing 10 or the cover plate assembly 20 through the first welding seam 70 and the second welding seam 80 .
  • the welding seam realizing the connection between the sealing member 50 and the conductive top cover 21 or the conductive housing 10 is a two-section welding seam, and the two sections of welding seam are respectively formed and connected end to end.
  • the sealing member 50 is welded to the conductive top cover 21
  • two sections of welds are formed on the sealing member 50 and the conductive top cover 21 by segmental welding.
  • the first welding seam The formation of 70 and the formation of the second weld 80 may be separated by a preset time.
  • the first welding seam 70 can be formed first, and after the first welding seam 70 is completed, a preset time interval is allowed so that the first welding seam 70 can effectively dissipate heat and cool, and then the second welding seam 80 can be formed.
  • Effectively reduce the heat accumulation of the weld that is, reduce the heat of the weld, especially the heat of the first head end 71 and the first tail end 72 of the first weld 70, when the first weld 70 and the second weld 80
  • it can also alleviate the heating of the electrolyte, reduce or avoid the vaporization of the electrolyte, thereby effectively preventing yellowing at the end of the welding seam, and further improving the yield of the battery 100 .
  • the liquid injection hole 23 when the liquid injection hole 23 is provided on the cover assembly 20 , the liquid injection hole 23 may be located on the conductive top cover 21 , and the liquid injection hole 23 penetrates the conductive top cover 21 .
  • the conductive top cover 21 can also be arranged on the bottom of the conductive housing 10, or the conductive top, 21 can also be arranged on the side wall of the conductive housing 10, that is, when the liquid injection hole 23 is arranged on When the conductive top cover 21 is on the conductive top cover 21 , the arrangement of the liquid injection hole 23 can be changed according to the position of the conductive top cover 21 on the conductive housing 10 .
  • the liquid injection hole 23 when the liquid injection hole 23 is opened on the conductive housing 10, the liquid injection hole 23 can be opened on the bottom wall of the conductive housing 10, or the liquid injection hole 23 can also be opened on the side wall of the conductive housing 10, Alternatively, the liquid injection hole 23 can also be opened on the top of the conductive housing 10 .
  • the opening position of the liquid injection hole 23 can be selected and set according to the structural design of the battery 100 or specific application scenarios.
  • the welding penetration of the first weld 70 and the second weld 80 can be greater than the thickness of the sealing member 50, and less than the sum of the thicknesses of the sealing member 50 and the conductive top cover 21, so that the connection between the sealing member 50 and the conductive top cover 21 is realized through the first welding seam 70 and the second welding seam 80 Simultaneously, it can also prevent the weld from penetrating the conductive top cover 21 so that the weld seam appears on the side of the conductive top cover 21 facing the cavity 11, thereby avoiding the occurrence of the weld seam on the side of the conductive top cover 21 facing the cavity 11 and affecting the conductive top cover 21.
  • the electrical connection with the tab (such as the positive tab 61 ) effectively improves the reliability and stability of the electrical connection between the tab and the conductive top cover 21 .
  • the welding penetration depth of the first welding seam 70 and the second welding seam 80 can be greater than that of the sealing member 50. thickness, and less than the sum of the thicknesses of the sealing member 50 and the conductive shell 10, which can prevent the weld seam from penetrating the conductive shell 10 and affecting the electrical connection between the conductive shell 10 and the tab, thereby effectively improving the conductive shell 10. The reliability and stability of the electrical connection with the tabs.
  • the depth value of the first weld 70 and the second weld 80 extending on the conductive top cover 21 It can be 0.05mm-0.2mm, which can effectively ensure the reliability and firmness of the connection between the sealing member 50 and the conductive top cover 21 , and at the same time, can effectively prevent the weld seam from penetrating the conductive top cover 21 .
  • the first welding seam 70 and the second welding seam 80 provided by the embodiment of the present application will be described in detail below by taking the liquid injection hole 23 opened on the conductive top cover 21 , that is, the sealing member 50 is disposed on the conductive top cover 21 as an example.
  • the shapes of the first welding seam 70 and the second welding seam 80 may both be arc-shaped, and the first welding seam 70 and the second welding seam 80 are arranged concentrically. This can make the first welding seam 70 and the second welding seam 80 better connected, effectively improving the sealing between the first head end 71 and the second tail end 82 and the connection between the second head end 81 and the first tail end 72 performance and reliability, and improve the tightness of the connection between the sealing member 50 and the conductive top cover 21 , thereby effectively improving the sealing effect of the sealing member 50 on the liquid injection hole 23 and further improving the performance of the battery 100 .
  • first head end 71 and the second tail end 82 there may be a partial overlap between the first head end 71 and the second tail end 82 , and/or there may be a partial overlap between the second head end 81 and the first tail end 72 .
  • there may be only a partial overlap between the first head end 71 and the second tail end 82 which can further improve the tightness of the connection between the first head end 71 and the second tail end 82 .
  • there may be only a partial overlap between the second head end 81 and the first tail end 72 which can further improve the tightness of the connection between the second head end 81 and the first tail end 72 .
  • first head end 71 and the second tail end 82 there may also be a partial overlap between the first head end 71 and the second tail end 82, and there is also a partial overlap between the second head end 81 and the first tail end 72, so that the first head end 71 and the first tail end 72 may be simultaneously improved.
  • the tightness of the connection between the second tail end 82 and the tightness of the connection between the second head end 81 and the first tail end 72 That is, the sealing performance of the connection between the first welding seam 70 and the second welding seam 80 is further improved, thereby effectively improving the sealing performance of the connection between the sealing member 50 and the conductive top cover 21 , and improving the performance of the battery 100 .
  • the degree range of the central angle of the overlapping portion of the first tail end 72 and the second head end 81 is 0°-30°, and/or, the degree range of the central angle of the overlapping portion of the second tail end 82 and the first head end 71 is The degree range is 0°-30°.
  • the degree range of the central angle of the overlapping portion of the first tail end 72 and the second head end 81 may be 0°-30°, or it may be only the overlapping portion of the second tail end 82 and the first head end 71
  • the degree range of the central angle of the circle is 0 °-30 °, or, it can also be the central angle range of the overlapping part of the first tail end 72 and the second head end 81 and the overlapping part of the second tail end 82 and the first head end 71. 0°-30°. This can effectively ensure the overlapping area between the first tail end 72 and the second head end 81 and the second tail end 82 and the first head end 71, thereby further improving the distance between the first weld seam 70 and the second weld seam 80. The tightness of the connection between them improves the tightness of the sealing member 50 to the liquid injection hole 23 .
  • the battery 100 can also reduce or avoid the excessive overlap of the head and tail ends of the first weld 70 and the second weld 80 to increase the heat, effectively preventing the yellowing of the first weld 70 and the second weld 80 at the overlap of the head and tail.
  • the performance of the battery 100 is further improved.
  • the central angle of the first weld 70 may range from 180° to 240°, and/or the central angle of the second weld 80 may range from 120° to 240°.
  • the center angle of the first welding seam 70 may range from 180° to 240°, and the head and tail ends of the second welding seam 80 are connected with the head and tail ends of the first welding seam 70 .
  • the central angle of the second welding seam 80 may range from 120° to 240°, and the first welding seam 70 is connected to the end of the second welding seam 80 .
  • the central angle of the first welding seam 70 may range from 180° to 240°, and the central angle of the second welding seam 80 may range from 120° to 240°.
  • first welding seam 70 and the second welding seam 80 all can not be too long, perhaps also can avoid that one of the welding seam in the first welding seam 70 and the second welding seam 80 is too long, can reduce or avoid the result of the first welding seam 70 and the second welding seam 80
  • the first weld 70 and/or the second weld 80 are too long to increase the heat, further reducing or avoiding the yellowing and bursting of the first weld 70 and the second weld 80 at the end-to-end contact or overlapping parts .
  • the inner diameter range of the first weld 70 can be 3.6mm-4mm
  • the outer diameter range of the first weld 70 can be 4mm-4.4mm
  • the inner diameter range of the second weld 80 can also be 3.6mm -4mm
  • the outer diameter range of the first weld 70 may also be 4mm-4.4mm.
  • the inner diameter range of the first weld 70 is 3.6mm-4mm, and the outer diameter range is 4mm-4.4mm, or, only the inner diameter range of the second weld 80 is 3.6mm-4mm, and the outer diameter
  • the range is 4mm-4.4mm, or, the inner diameter of the first welding seam 70 and the second welding seam 80 are both in the range of 3.6mm-4mm, and the outer diameter is in the range of 4mm-4.4mm.
  • the first welding seam 70 and the second welding seam 80 located in this size range can make the sealing member 50 and the conductive top cover 21 better connected, reduce or avoid the situation of false welding, and effectively improve the sealing between the conductive top cover 21 and the conductive top cover 21.
  • the reliability and firmness of the connection between the parts 50 can further improve the performance of the battery 100.
  • FIG. 5 is a schematic structural diagram of a conductive top cover provided by an embodiment of the present application.
  • the conductive top cover 21 can be provided with a first concave portion 211 on the side facing away from the cover plate 22 , and when the sealing member 50 is arranged on the conductive top cover 21 , it can be provided at Inside the first recessed portion 211 .
  • the sealing member 50 is arranged in the first concave portion 211 , the occupied space of the sealing member 50 can be reduced, and the increase in thickness of the battery 100 due to the arrangement of the sealing member 50 can be reduced or avoided, which is beneficial to the miniaturization design of the battery 100 . At the same time, it also helps to reduce the weight of the battery 100 .
  • the shape of the first concave portion 211 can be circular, the depth of the first concave portion 211 can be 0.25mm, and the diameter can be 4.6mm, which can further reduce the weight of the battery 100, and at the same time, can also make the sealing member 50 more compact. Good arrangement in the first concave portion 211 can effectively reduce or avoid the influence of the sealing member 50 on the overall thickness of the battery 100 .
  • the first welding seam 70 and the second welding seam 80 When forming the first welding seam 70 and the second welding seam 80 on the sealing member 50, the first welding seam 70 and the second welding seam 80 will form protrusions on the side of the sealing member 50 facing away from the conductive housing 10, wherein , the height of the apex of the protrusion may be lower than the side of the conductive top cover 21 facing away from the conductive housing 10, that is, the first weld 70 and the second weld 80 are located in the first recess 211 and do not protrude Outside the first recessed portion 211 .
  • a second recessed portion 212 may also be disposed in the first recessed portion 211 , and the liquid injection hole 23 may be disposed in the second recessed portion 212 .
  • the spilled electrolyte solution can be limited in the second recessed part 212, thereby reducing or avoiding the electrolyte solution from spilling in the first recessed part 211, and preventing the electrolytic solution from spilling on the first recessed part. 211 affects the normal welding of the seal 50, further improving the reliability and stability of the seal 50 welding.
  • Figure 6 is a schematic structural diagram of a seal provided in the embodiment of the present application
  • Figure 7 is a schematic structural view of another seal provided in the embodiment of the present application
  • Figure 8 is a first weld provided in the embodiment of the present application and a schematic diagram of a second weld setup on another seal.
  • the shape of the sealing member 50 can be a flat plate structure, that is, the thickness of the sealing member 50 is basically consistent, which can simplify the structure of the sealing member 50, thereby reducing the design cost and processing cost of the sealing member 50. ,Improve economic efficiency.
  • the diameter of the sealing member 50 may be 4.4 mm, so that the sealing member 50 can fully cover the liquid injection hole 23 to improve the sealing performance of the sealing member 50 on the liquid injection hole 23 .
  • the thickness of the sealing member 50 can be 0.15 mm, which can effectively improve the structural strength of the sealing member 50, thereby improving the reliability and firmness of the connection between the sealing member 50 and the conductive top cover 21, and further improving the connection between the sealing member 50 and the liquid injection hole. 23 tightness.
  • the shape of the sealing member 50 can also be other structures.
  • the sealing portion 51 may be opposite to the liquid injection hole 23 .
  • the thickness of the connecting portion 52 can be smaller than the thickness of the sealing portion 51, that is, the sealing member 50 is composed of the connecting portion 52 and the sealing portion 51, the sealing portion 51 protrudes from the connecting portion 52, and the connecting portion 52 has been thinned.
  • the thickness of the connecting portion 52 of the sealing member 50 may be less than 0.15 mm, and the thickness of the sealing portion 51 may be greater than or equal to 0.15 mm.
  • the first welding seam 70 and the second welding seam 80 can be located on the connecting portion 52 . Due to the thinning of the connecting portion 52 to make its thickness relatively thin, the first welding seam 70 and the second welding seam 80 are formed on the connecting portion 52, so that the first welding seam 70 and the second welding seam 70 can be formed with less welding energy. Two welding seams 80, so as to realize welding, can further reduce the heat of the first welding seam 70 and the second welding seam 80, reduce the accumulation of welding seam heat, thereby effectively reduce or avoid the first welding seam 70 and the second welding seam 80 Yellowing and bursting occurs at the overlapping parts of the head and tail ends, which effectively improves the performance of the battery 100 .
  • the thickness of the sealing portion 51 can be 0.25mm, which relatively increases the thickness of the sealing portion 51, which can reduce the height difference between the sealing portion 51 and the conductive top cover 21.
  • the thickness of the connecting portion 52 can be 0.1 mm, which can further reduce the welding energy between the sealing member 50 and the conductive top cover 21 , thereby reducing the heat of the welding seam.
  • the battery forming method provided in the embodiment of the present application will be described in detail below.
  • the above battery forming method may include:
  • the assembly of components such as the conductive casing 10, the battery cell 60, the cover plate 22, and the conductive top cover 21 should be completed.
  • the electrolyte solution can be injected into the cavity 11 through the liquid injection hole 23, and then Then place the sealing member 50 on the conductive top cover 21 .
  • the placement of the sealing member 50 can be realized by an automatic device, for example, the placement of the sealing member 50 can be realized by using a robot.
  • a suction cup may be provided on the manipulator, and the sealing member 50 may be picked up by the suction cup and placed in the first concave portion 211 on the conductive top cover 21 .
  • the conductive top cover 21 can be photographed to determine its position through a detection element, such as a CCD (Charge-coupled Device; charge-coupled device), etc., and then The sealing member 50 is then placed on the conductive top cover 21 .
  • a detection element such as a CCD (Charge-coupled Device; charge-coupled device), etc.
  • the first weld 70 can be formed on the sealing member 50 and cooled for a preset time.
  • a welding machine such as a laser welding machine, can be used to form the first weld 70 on the connecting portion 52 of the sealing member 50, and after the first weld 70 is completed, wait for a preset time interval, that is, stop Laser welding, so that the temperature of the first welding seam 70 can be fully cooled.
  • the preset time may be 0.5s-2s.
  • the first welding seam 70 can be fully dissipated and cooled, thereby further reducing the occurrence of yellowing and explosive spots at the beginning and end of the first welding seam 70 and the second welding seam 80, and further improving the yield rate of the battery 100 .
  • several welding spots may be firstly formed on the sealing member 50 . That is, after the sealing member 50 is placed in the first recessed portion 211 , several preset welding spots can be formed on the connecting portion 52 of the sealing member 50 by a welding machine, so as to initially position the sealing member 50 . After the preset welding spot is formed, the manipulator and the suction cup can be withdrawn, and then the first welding seam 70 is formed by the welding machine.
  • first welding seam 70 and the second welding seam 80 are connected in turn to form a closed welding seam, so that the sealing member 50 is welded and arranged on the conductive top cover 21 through the first welding seam 70 and the second welding seam 80 , forming the battery 100 described above.
  • connection should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral body; it can be It can be directly connected or indirectly connected through an intermediary, and can be an internal connection between two elements or an interaction relationship between two elements.
  • first the terms “first”, “second”, etc. are used for descriptive purposes only, and should not be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Sealing Battery Cases Or Jackets (AREA)
  • Filling, Topping-Up Batteries (AREA)
  • Connection Of Batteries Or Terminals (AREA)

Abstract

本发明提供一种电池，包括导电壳体和盖板组件，盖板组件与导电壳体围成腔体。导电壳体或盖板组件上开设有与腔体连通的注液孔，注液孔上设置有密封件，以封闭注液孔。在密封件上形成有第一焊缝和第二焊缝，第一焊缝具有第一首端和第一尾端，第二焊缝具有第二首端和第二尾端，其中，第一首端和第二尾端相连，第二首端和第一尾端相连，密封件通过第一焊缝和第二焊缝与导电壳体或盖板组件连接。也即实现密封件与导电顶盖之间连接的焊缝为两段焊缝，采用分段焊接的方式，第一焊缝和第二焊缝之间就可以间隔预设的时间，以使第一焊缝能够充分散热，降低焊缝热量的积累，减少或避免出现发黄和炸点的现象，提高电池良率。

Description

一种电池
本申请要求于2021年12月17日提交中国专利局、申请号为202111553172.8、申请名称为“一种电池”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
本申请涉及电池技术领域，尤其涉及一种电池。
背景技术
电池是一种将化学能转化为电能的元器件，在日常的生活和工作中具有非常广泛的应用。例如，纽扣电池，常应用于电子表、蓝牙耳机、电动玩具等各种电子设备中，以为电子设备提供电源。在人们的生活和工作中占据非常重要的地位。
纽扣电池包括有导电壳体和盖板组件，盖板组件和导电壳体围设形成有腔体，腔体内设置有电解液。在盖板组件或导电壳体上开设有注液孔，电解液通过注液孔注入腔体内，注液孔上还焊接有密封件，以封闭注液孔。通常密封件与盖板组件或导电壳体之间的焊接多采用一次焊接的方式，焊缝结构一次形成，中间不停留，整个焊接过程从焊缝的首端至焊缝的尾端用时约60-70毫秒，这样就会在密封件上形成连续的圆环形焊缝，而为保证密封性，通常会使形成的焊缝的首尾端部分重叠。
然而，焊缝结构一次形成热量聚集较高，在焊缝的首尾端容易出现发黄，甚至出现炸点，影响电池的良率。
发明内容
本发明提供一种电池，以解决现有电池中，焊缝结构一次形成热量聚集较高，在焊缝的首尾端容易出现发黄，甚至出现炸点，影响电池良率的问题。
本申请提供一种电池，包括导电壳体和盖板组件，所述盖板组件盖设在 所述导电壳体上，所述盖板组件与所述导电壳体围成腔体，所述导电壳体或所述盖板组件上开设有与所述腔体连通的注液孔，所述注液孔上设置有密封件，以封闭所述注液孔；
所述密封件上分别形成有第一焊缝和第二焊缝，所述第一焊缝具有第一首端和第一尾端，所述第二焊缝具有第二首端和第二尾端，所述第一首端和所述第二尾端相连，所述第二首端和所述第一尾端相连，所述密封件通过所述第一焊缝和所述第二焊缝与所述导电壳体或所述盖板组件连接。
也即实现密封件与导电顶盖之间连接的焊缝为两段焊缝，两段焊缝分别形成，并且首尾相连。换言之，在密封件与导电顶盖焊接连接时，采用分段焊接的方式，在密封件与导电顶盖上形成两段焊缝，在实际焊接操作中，第一焊缝的形成和第二焊缝的形成可以间隔预设的时间。
这样就能够使第一焊缝进行充分的散热冷却，后再形成第二焊缝，从而有效减少或避免热量的积累，也即降低了焊缝的热量，当第一焊缝与第二焊缝首尾端连接时，可以有效减少或避免在连接部位出现炸点的情况，有效提高了电池的良率。同时，还能够缓解电解液的受热情况，减少或避免了电解液发生汽化的现象，从而有效防止了焊缝收尾端出现发黄的情况，进一步提高电池的良率。
在一种可能实现的方式中，所述盖板组件包括导电顶盖和盖板，所述盖板设置在所述导电壳体上，所述导电顶盖绝缘设置在所述盖板上，所述注液孔位于所述导电顶盖上，所述注液孔贯穿所述导电顶盖。
在一种可能实现的方式中，所述第一焊缝和所述第二焊缝的焊接熔深大于所述密封件的厚度，且小于所述密封件与所述导电壳体的厚度之和；
或者，所述第一焊缝和所述第二焊缝的焊接熔深大于所述密封件的厚度，且小于所述密封件与所述导电顶盖的厚度之和。
在一种可能实现的方式中，所述第一焊缝和所述第二焊缝的形状均为圆弧形，且所述第一焊缝与所述第二焊缝同心设置。
在一种可能实现的方式中，所述第一首端与所述第二尾端部分重叠，和/或，所述第二首端与所述第一尾端部分重叠。
在一种可能实现的方式中，所述密封件包括密封部和环绕设置在所述密封部外周上的连接部，所述密封部与所述注液孔相对；
所述连接部的厚度小于所述密封部的厚度，所述第一焊缝和所述第二焊缝位于所述连接部上。
在一种可能实现的方式中，所述第一尾端与所述第二首端重叠部分的圆心角度数的取值范围为0°-30°；
和/或，所述第二尾端与所述第一首端重叠部分的圆心角度数的取值范围为0°-30°。
在一种可能实现的方式中，所述第一焊缝的圆心角的度数范围为180°-240°，和/或，所述第二焊缝的圆心角的度数范围为120°-240°。
在一种可能实现的方式中，所述第一焊缝的内径范围3.6mm-4mm，所述第一焊缝的外径范围为4mm-4.4mm；
和/或，所述第二焊缝的内径范围为3.6mm-4mm，所述第二焊缝的外径范围为4mm-4.4mm。
在一种可能实现的方式中，所示导电顶盖背向所述导电壳体的一面上具有第一凹陷部，所述密封件位于所述第一凹陷部内。
在一种可能实现的方式中，所述第一焊缝和所述第二焊缝在所述密封件背向所述导电壳体的一面上具有凸起，所述凸起的顶点低于所述导电顶盖背向所述导电壳体的一面。
在一种可能实现的方式中，所述第一凹陷部内还具有第二凹陷部，所述注液孔位于所述第二凹陷部内。
附图说明
为了更清楚地说明本申请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申请的一些实施例，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为本申请实施例提供的一种电池结构示意图；
图2为本申请实施例提供的一种电池结构的分解示意图；
图3为图1中区域A的放大图；
图4为本申请实施例提供的一种电池的俯视图；
图5为本申请实施例提供的一种导电顶盖的结构示意图；
图6为本申请实施例提供的一种密封件的结构示意图；
图7为本申请实施例提供的另一种密封件的结构示意图；
图8为本申请实施例提供的一种第一焊缝和第二焊缝在另一种密封件上设置的示意图。
附图标记说明：
100-电池；
10-导电壳体；
11-腔体；
20-盖板组件；
21-导电顶盖；
211-第一凹陷部；
212-第二凹陷部；
22-盖板；
23-注液孔；
30-第二绝缘件；
40-第一绝缘件；
50-密封件；
51-密封部；
52-连接部；
60-电芯；
61-正极极耳；
70-第一焊缝；
71-第一首端；
72-第一尾端；
80-第二焊缝；
81-第二首端；
82-第二尾端。
具体实施方式
为使本申请的目的、技术方案和优点更加清楚，下面将结合本申请中的附图，对本申请中的技术方案进行清楚、完整地描述，显然，所描述的 实施例是本申请一部分实施例，而不是全部的实施例。基于本申请中的实施例，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，都属于本申请保护的范围。
图1为本申请实施例提供的一种电池结构示意图，图2为本申请实施例提供的一种电池结构的分解示意图。
在本申请实施例中，以该电池为纽扣电池为例进行说明，参见图1所示，电池100包括导电壳体10和盖板组件20，盖板组件20盖设在导电壳体10上，盖板组件20和导电壳体10围成有腔体11。具体的，结合图2所示，盖板组件20可以包括有导电顶盖21和盖板22，盖板22的形状为环形结构，盖板22可以盖设在导电壳体10上。
导电顶盖21设置在盖板22上，且导电顶盖21和盖板22之间绝缘连接，具体的，例如，在导电顶盖21和盖板22之间可以设置有第一绝缘件40，第一绝缘件40可以将导电顶盖21和盖板22绝缘隔离，以防止导电顶盖21和盖板22发生电接触而使电池100发生短路，有效提高了电池100的安全性。
在电池100的腔体11内还可以设置有电芯60和电解液(图中未示出)，电芯60在电解液中可以发生化学反应，从而生成电能。电芯60可以包括有正极极耳61和负极极耳(图中未示出)，其中，正极极耳61可以与导电顶盖21电连接，负极极耳可以与导电壳体10电连接，以使导电顶盖21为电池100的正极端，导电壳体10为电池100的负极端。
当然，在一些示例中，也可以是正极极耳61与导电壳体10电连接，负极极耳与导电顶盖21电连接，使导电壳体10为电池100的正极端，导电顶盖21为电池100的负极端。本申请实施例中，以正极极耳61与导电顶盖21电连接，负极极耳与导电壳体10电连接为例进行说明。
在电芯60和盖板22之间还可以设置有第二绝缘件30，第二绝缘件30可以将电芯60、正极极耳61均与盖板22绝缘隔离，以防止电芯60或正极极耳61与盖板22发生电性接触，减少或避免了因电芯60或正极极耳61与盖板22电性接触而使电池100发生短路，进一步提高电池100的安全性。
在导电壳体10或盖板组件20上还开设有注液孔23，也即注液孔23可以开设在导电壳体10上，或者，注液孔23也可以开设在盖板组件20上。其中，注液孔23与电池100的腔体11相连通，电解液可以通过注液孔23注入 到腔体11内。在注液孔23上还设置有密封件50，密封件50用于封闭注液孔23，以防止电解液发生泄漏。
应当理解的是，密封件50的作用是用于封闭注液孔23，因此，密封件50的设置位置与注液孔23的开设位置相关，也即，当注液孔23开设在盖板组件20上时，密封件50可以设置在盖板组件20上，而当注液孔23开设在导电壳体10上时，密封件50可以设置在导电壳体10上。
密封件通常焊接设置在导电壳体或盖板组件上，例如，在相关技术中，密封件与导电顶盖之间通过连续的圆环形焊缝进行连接，其中，该焊缝多采用一次焊接的方式进行，也即焊缝结构是一次形成，中间无停留，通常整个焊接过程从起始到结束仅用时60-70毫秒。而为保证密封性，还会使焊缝的收尾端会相接，甚至部分重叠。
然而，焊缝结构在极短的时间内一次形成时，热量聚集较高，容易使电池壳体内的电解液因受热而发生汽化，从而在焊缝首尾端的位置出现发黄的现象。同时，焊缝的首尾端相接或重叠且焊缝形成时间短，首端散热时间较短，未进行有效的散热，就使首端与尾端相接或重叠，很容易使焊缝在首尾端相接或重叠的部位产生炸点，从而严重影响电池的良率。
基于上述问题，本申请实施例提供一种电池，能够有效降低焊缝热量的聚集，减少或避免焊缝首尾端出现发黄或炸点的现象，有效提高电池的良率。
图3为图1中区域A的放大图，图4为本申请实施例提供的一种电池的俯视图。
参见图3和图4所示，在本申请实施例中，密封件50上分别形成有第一焊缝70和第二焊缝80，其中，第一焊缝70和第二焊缝80可以通过激光焊接的方式形成。第一焊缝70具有第一首端71和第一尾端72，第二焊缝80具有第二首端81和第二尾端82。第一首端71和第二尾端82相连，第二首端81和第一尾端72相连，也即第一焊缝70和第二焊缝80收尾依次相连接，从而使第一焊缝70和第二焊缝80通过拼接组合形成闭合的焊缝。
第一焊缝70和第二焊缝80均是从密封件50延伸至导电壳体10或盖板组件20上，也即第一焊缝70和第二焊缝80的熔深大于密封件50的厚度，以使密封件50可以通过第一焊缝70和第二焊缝80与导电壳体10或盖板组件20连接。
也即实现密封件50与导电顶盖21或导电壳体10之间连接的焊缝为两段焊缝，两段焊缝分别形成，并且首尾相连。换言之，在密封件50与导电顶盖21焊接连接时，采用分段焊接的方式，在密封件50与导电顶盖21上形成两段焊缝，这样，在实际焊接操作中，第一焊缝70的形成和第二焊缝80的形成可以间隔预设的时间。
例如，可以先形成第一焊缝70，在完成第一焊缝70后，间隔预设的时间，以使第一焊缝70有效的散热冷却，之后再形成第二焊缝80，这样就可以有效降低焊缝的热量聚集，也即降低焊缝的热量，尤其是第一焊缝70的第一首端71和第一尾端72的热量，当第一焊缝70与第二焊缝80首尾端连接或重叠时，可以有效减少或避免在连接部位出现炸点的情况，有效提高了电池100的良率。同时，还能够缓解电解液的受热情况，减少或避免了电解液发生汽化的现象，从而有效防止了焊缝收尾端出现发黄的情况，进一步提高电池100的良率。
其中，在本申请实施例中，注液孔23设置在盖板组件20上时，注液孔23可以位于导电顶盖21上，且注液孔23贯穿导电顶盖21。其中，在一些示例中，导电顶盖21还可以设置在导电壳体10的底部，或者，导电顶,21还可以设置在导电壳体10的侧壁，也即，当注液孔23设置在导电顶盖21上时，注液孔23的设置可以根据导电顶盖21在导电壳体10上设置位置的不同而发生变化。
而当注液孔23开设在导电壳体10上时，注液孔23可以开设在导电壳体10的底壁上，或者，注液孔23也可以开设在导电壳体10的侧壁上，或者，注液孔23还可以开设在导电壳体10的顶部。具体的，注液孔23的开设部位可以根据电池100的结构设计或具体的应用场景选择设定。
在本申请实施例中，当注液孔23开设在导电顶盖21上，也即密封件50焊接在导电顶盖21上时，第一焊缝70和第二焊缝80的焊接熔深可以大于密封件50的厚度，并且小于密封件50和导电顶盖21的厚度之和，这样在使密封件50和导电顶盖21之间通过第一焊缝70和第二焊缝80实现连接的同时，还能够防止焊缝穿透导电顶盖21而使导电顶盖21面向腔体11的一面出现焊缝，避免了导电顶盖21面向腔体11的一面出现焊缝而影响导电顶盖21与极耳(例如正极极耳61)的电连接，从而有效提高了极耳与导电顶盖21之间 电连接的可靠性和稳定性。
相应的，当注液孔23开设在导电壳体10上，也即密封件50焊接在导电壳体10上时，第一焊缝70和第二焊缝80的焊接熔深可以大于密封件50的厚度，并且小于密封件50和导电壳体10的厚度之和，这样可以避免焊缝穿透导电壳体10而影响导电壳体10与极耳的电连接，从而有效提高了导电壳体10与极耳之间电连接的可靠性和稳定性。
例如，以注液孔23开设在导电顶盖21，也即密封件50焊接在导电顶盖21上为例，第一焊缝70和第二焊缝80在导电顶盖21上延伸的深度值可以为0.05mm-0.2mm，这样可以有效保证密封件50与导电顶盖21之间连接的可靠性和牢固性，同时，还能够有效防止焊缝穿透导电顶盖21。
以下以注液孔23开设在导电顶盖21，也即密封件50设置在导电顶盖21上为例，对本申请实施例提供的第一焊缝70和第二焊缝80进行详细说明。
在本申请实施例中，继续参见图3所示，第一焊缝70和第二焊缝80的形状可以均为圆弧形，且第一焊缝70与第二焊缝80同心设置。这样可以使第一焊缝70与第二焊缝80更好的连接，有效提高了第一首端71与第二尾端82以及第二首端81与第一尾端72之间连接的密封性和可靠性，提高密封件50与导电顶盖21之间连接的密封性，从而有效提升了密封件50对注液孔23的密封效果，进一步提升电池100的性能。
其中，第一首端71与第二尾端82之间可以有部分重叠，和/或，第二首端81与第一尾端72之间有部分重叠。其中，可以仅是第一首端71与第二尾端82之间有部分重叠，这样可以进一步提高第一首端71与第二尾端82之间连接的密封性。或者，还可以仅是第二首端81与第一尾端72之间有部分重叠，这样可以进一步提高第二首端81与第一尾端72之间连接的密封性。或者，还可以是第一首端71与第二尾端82之间有部分重叠，并且第二首端81与第一尾端72之间也有部分重叠，这样可以同时提高第一首端71与第二尾端82之间连接的密封性，以及第二首端81与第一尾端72之间连接的密封性。也即进一步提高了第一焊缝70与第二焊缝80之间连接的密封性，从而有效提高了密封件50与导电顶盖21之间连接的密封性，提升电池100的性能。
具体的，第一尾端72与第二首端81重叠部分的圆心角的度数范围为0°-30°，和/或，第二尾端82与第一首端71重叠部分的圆心角的度数范围为 0°-30°。其中，可以仅是第一尾端72与第二首端81重叠部分的圆心角的度数范围为0°-30°，或者，也可以仅是第二尾端82与第一首端71重叠部分的圆心角的度数范围为0°-30°，或者，还可以是第一尾端72与第二首端81重叠部分以及第二尾端82与第一首端71重叠部分的圆心角范围均为0°-30°。这样可以有效保证第一尾端72与第二首端81以及第二尾端82与第一首端71之间的重叠面积，从而进一步提高第一焊缝70和第二焊缝80首尾端之间连接的密封性，提高密封件50对注液孔23的密封性。
同时，还能够减少或避免第一焊缝70和第二焊缝80首尾端重叠部位过大而增加热量，有效防止了第一焊缝70和第二焊缝80在首尾端重叠部位产生发黄和炸点的情况，进一步提高了电池100的性能。
在本申请实施例中，第一焊缝70的圆心角度数范围可以为180°-240°，和/或，第二焊缝80的圆心角的度数范围可以为120°-240°。其中，可以是第一焊缝70的圆心角度数范围为180°-240°，第二焊缝80首尾端与第一焊缝70首尾端相连接。或者，也可以是第二焊缝80的圆心角的度数范围为120°-240°，第一焊缝70与第二焊缝80首尾端相连接。或者，还可以是第一焊缝70的圆心角度数范围为180°-240°，且第二焊缝80的圆心角的度数范围为120°-240°。这样就使第一焊缝70和第二焊缝80均不会过长，或者也能够避免第一焊缝70和第二焊缝80中其中一条焊缝过长，可以减小或避免因第一焊缝70和/或第二焊缝80过长而增加热量，进一步减小或避免第一焊缝70和第二焊缝80在首尾端相接或重叠部位产生发黄和炸点的情况。
其中，第一焊缝70的内径范围可以为3.6mm-4mm，第一焊缝70的外径范围可以为4mm-4.4mm，和/或，第二焊缝80的内径范围也可以为3.6mm-4mm，第一焊缝70的外径范围也可以为4mm-4.4mm。其中，可以仅是第一焊缝70的内径范围为3.6mm-4mm，外径范围为4mm-4.4mm，或者，也可以仅是第二焊缝80的内径范围为3.6mm-4mm，外径范围为4mm-4.4mm，或者，还可以是第一焊缝70和第二焊缝80的内径范围均为3.6mm-4mm，且外径范围为4mm-4.4mm。位于该尺寸范围的第一焊缝70和第二焊缝80可以使密封件50与导电顶盖21更好的连接，减少或避免了发生虚焊的情况，有效提高了导电顶盖21与密封件50之间连接的可靠性和牢固性，进一步提升电池100的性能。
图5为本申请实施例提供的一种导电顶盖的结构示意图。
在本申请实施例中，参见图5所示，导电顶盖21在背向盖板22的一侧可以设置有第一凹陷部211，密封件50设置在导电顶盖21上时，可以设置在第一凹陷部211内。密封件50设置在第一凹陷部211内时，能够降低密封件50的占用空间，减少或避免了因密封件50的设置而增加电池100的厚度，有利于电池100的小巧化设计。同时，也有助于减轻电池100的重量。
其中，第一凹陷部211的形状可以为圆形，第一凹陷部211的深度可以为0.25mm，直径可以为4.6mm，这样可以进一步减轻电池100的重量，同时，还可以使密封件50更好的设置在第一凹陷部211内，有效减少或避免了密封件50对电池100整体厚度的影响。
在密封件50上形成第一焊缝70和第二焊缝80时，第一焊缝70和第二焊缝80在密封件50背向导电壳体10的一面上会形成有凸起，其中，该凸起的顶点高度可以低于导电顶盖21背向导电壳体10的一面，也即第一焊缝70和第二焊缝80是位于第一凹陷部211内的，并未凸出于第一凹陷部211外。这样可以减少或避免第一焊缝70和第二焊缝80对电池100整体厚度的影响，防止因第一焊缝70和第二焊缝80的凸起厚度过高而增加电池100的整体尺寸，有利于电池100轻量化设计。
在第一凹陷部211内还可以设置有第二凹陷部212，注液孔23可以设置在第二凹陷部212内。这样在注入电解液的时候，洒落的电解液可以被限制在第二凹陷部212内，从而减少或避免了电解液洒落在第一凹陷部211内，防止了因电解液洒落在第一凹陷部211内而影响密封件50的正常焊接，进一步提高了密封件50焊接的可靠性和稳定性。
图6为本申请实施例提供的一种密封件的结构示意图，图7为本申请实施例提供的另一种密封件的结构示意图，图8为本申请实施例提供的一种第一焊缝和第二焊缝在另一种密封件上设置的示意图。
参见图6所示，密封件50的形状可以为平整的板状结构，也即密封件50的厚度基本保持一致，这样可以简化密封件50的结构，从而降低密封件50的设计成本和加工成本，提高经济效益。
其中，密封件50的直径可以为4.4mm，这样可以使密封件50充分的将注液孔23覆盖，以提高密封件50对注液孔23的密封性。密封件50的厚度 可以为0.15mm，这样可以有效提高密封件50的结构强度，从而提高密封件50与导电顶盖21之间连接的可靠性和牢固性，进一步提升密封件50对注液孔23的密封性。
或者，密封件50的形状还可以是其他结构，例如，参见图7所示，密封件50可以包括有密封部51和环绕设置在密封部51外周上的连接部52，密封件50设置在导电顶盖21上时，密封部51可以与注液孔23相对。其中，连接部52的厚度可以小于密封部51的厚度，也即密封件50由连接部52和密封部51组成，密封部51凸出连接部52，对连接部52进行了减薄处理，具体的，密封件50的连接部52厚度可以小于0.15mm，密封部51的厚度可以大于或等于0.15mm。
参见图8所示，密封件50在与导电顶盖21焊接连接时，第一焊缝70和第二焊缝80可以位于连接部52上。由于对连接部52减薄，使其厚度相对较薄，第一焊缝70和第二焊缝80形成于连接部52上，这样使用较小的焊接能量就能够形成第一焊缝70和第二焊缝80，从而实现焊接，能够进一步降低第一焊缝70和第二焊缝80的热量，减少焊缝热量的聚集，从而有效减少或避免了第一焊缝70和第二焊缝80在首尾端重叠的部位出现发黄和炸点的情况，有效提升了电池100的性能。
其中，密封部51的厚度可以为0.25mm，也就相对增加了密封部51的厚度，这样可以减少密封部51的与导电顶盖21之间的高度差，当密封部51上设置转接极耳或其他结构时，可以更加方便操作。而连接部52的厚度可以为0.1mm，这样可以进一步降低密封件50与导电顶盖21之间的焊接能量，从而降低焊缝的热量。
需要说明的是，本申请实施例涉及的数值和数值范围为近似值，受制造工艺的影响，可能会存在一定范围的误差，这部分误差本领域技术人员可以认为忽略不计。
以下对本申请实施例提供的电池成型方法进行详细说明，上述电池的成型方法可以包括：
首先，应当完成导电壳体10、电芯60、盖板22以及导电顶盖21等部件的组装，在完成上述部件的组装后，可以通过注液孔23向腔体11内注入电解液，然后再将密封件50放置与导电顶盖21上。
其中，密封件50的放置可以通过自动化的器件实现，例如，可以利用机械手实现密封件50的放置。具体的，在机械手上可以设置有吸盘，通过吸盘可以将密封件50吸取，并放置在导电顶盖21上的第一凹陷部211内。
另外，在放置密封件50之前，为保证放置位置的准确性，可以先通过探测元件，例如CCD(Charge-coupled Device；电荷耦合元件)等，对导电顶盖21进行拍照以确定其位置，然后再将密封件50放置在导电顶盖21上。
其次，在完成密封件50的放置后，就可以开始在密封件50上形成第一焊缝70，并冷却预设时间。具体的，可以通过焊接机，例如使用激光焊接机，先在密封件50的连接部52上形成第一焊缝70，在完成第一焊缝70后，间隔等待预设的时间，也即停止激光焊接，以使第一焊缝70能够充分降温冷却。
具体的，预设时间可以为0.5s-2s。这样可以使第一焊缝70能够进行充分的散热降温并冷却，从而进一步降低在第一焊缝70和第二焊缝80首尾端出现发黄和炸点的情况，进一步提升电池100的良率。
其中，在形成第一焊缝之前，可以首先在密封件50上形成几个焊点。也即在将密封件50放置在第一凹陷部211内之后，可以首先通过焊接机在密封件50的连接部52上形成几个预设的焊点，以对密封件50进行初步定位。形成预设焊点后，机械手和吸盘就可以撤离，然后通过焊接机形成第一焊缝70。
最后，在停止等待预设的时间后，再次通过激光焊接的方式，在密封件50上形成第二焊缝80。并使第二焊缝80的第二首端81与第一焊缝70的第一尾端72相连，第二焊缝80的第二尾端82与第一焊缝70的第一首端71相连，这样就使第一焊缝70和第二焊缝80收尾依次相连形成闭合的焊缝，从而通过第一焊缝70和第二焊缝80使密封件50焊接设置在导电顶盖21上，形成上述电池100。
在本发明的描述中，需要理解的是，术语“中心”、“纵向”、“横向”、“长度”、“宽度”、“厚度”、“上”、“下”、“前”、“后”、“左”、“右”、“竖直”、“水平”、“顶”、“底”“内”、“外”等指示的方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述本发明和简化描述，而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本发明的限制。
在本发明的描述中，需要理解的是，本文中使用的术语“包括”和“具有” 以及他们的任何变形，意图在于覆盖不排他的包含，例如，包含了一系列步骤或单元的过程、方法、系统、产品或设备不必限于清楚地列出的那些步骤或单元，而是可包括没有清楚地列出的或对于这些过程、方法、产品或设备固有的其它步骤或单元。
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相连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。此外，术语“第一”、“第二”等仅用于描述目的，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。
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 (12)

  1. 一种电池，其特征在于，包括导电壳体(10)和盖板组件(20)，所述盖板组件(20)盖设在所述导电壳体(10)上，所述盖板组件(20)与所述导电壳体(10)围成腔体(11)，所述盖板组件(20)或所述导电壳体(10)上开设有与所述腔体(11)连通的注液孔(23)，所述注液孔(23)上设置有密封件(50)，以封闭所述注液孔(23)；
    所述密封件(50)上分别形成有第一焊缝(70)和第二焊缝(80)，所述第一焊缝(70)具有第一首端(71)和第一尾端(72)，所述第二焊缝(80)具有第二首端(81)和第二尾端(82)，所述第一首端(71)和所述第二尾端(82)相连，所述第二首端(81)和所述第一尾端(72)相连，所述密封件(50)通过所述第一焊缝(70)和所述第二焊缝(80)与所述导电壳体(10)或所述盖板组件(20)连接。
  2. 根据权利要求1所述的电池，其特征在于，所述盖板组件(20)包括导电顶盖(21)和盖板(22)，所述盖板(22)设置在所述导电壳体(10)上，所述导电顶盖(21)绝缘设置在所述盖板(22)上，所述注液孔(23)位于所述导电顶盖(21)上，所述注液孔(23)贯穿所述导电顶盖(21)。
  3. 根据权利要求2所述的电池，其特征在于，所述第一焊缝(70)和所述第二焊缝(80)的焊接熔深大于所述密封件(50)的厚度，且小于所述密封件(50)与所述导电壳体(10)的厚度之和；
    或者，所述第一焊缝(70)和所述第二焊缝(80)的焊接熔深大于所述密封件(50)的厚度，且小于所述密封件(50)与所述导电顶盖(21)的厚度之和。
  4. 根据权利要求1-3任一所述的电池，其特征在于，所述第一焊缝(70)和所述第二焊缝(80)的形状均为圆弧形，且所述第一焊缝(70)与所述第二焊缝(80)同心设置。
  5. 根据权利要求4所述的电池，其特征在于，所述第一首端(71)与所述第二尾端(82)部分重叠，和/或，所述第二首端(81)与所述第一尾端(72)部分重叠。
  6. 根据权利要求1-3任一所述的电池，其特征在于，所述密封件(50) 包括密封部(51)和环绕设置在所述密封部(51)外周上的连接部(52)，所述密封部(51)与所述注液孔(23)相对；
    所述连接部(52)的厚度小于所述密封部(51)的厚度，所述第一焊缝(70)和所述第二焊缝(80)位于所述连接部(52)上。
  7. 根据权利要求4所述的电池，其特征在于，所述第一尾端(72)与所述第二首端(81)重叠部分的圆心角度数的取值范围为0°-30°；
    和/或，所述第二尾端(82)与所述第一首端(71)重叠部分的圆心角度数的取值范围为0°-30°。
  8. 根据权利要求4所述的电池，其特征在于，所述第一焊缝(70)的圆心角的度数范围为180°-240°，和/或，所述第二焊缝(80)的圆心角的度数范围为120°-240°。
  9. 根据权利要求4所述的电池，其特征在于，所述第一焊缝(70)的内径范围3.6mm-4mm，所述第一焊缝(70)的外径范围为4mm-4.4mm；
    和/或，所述第二焊缝(80)的内径范围为3.6mm-4mm，所述第二焊缝(80)的外径范围为4mm-4.4mm。
  10. 根据权利要求2所述的电池，其特征在于，所示导电顶盖(21)背向所述导电壳体(10)的一面上具有第一凹陷部(211)，所述密封件(50)位于所述第一凹陷部(211)内。
  11. 根据权利要求10所述的电池，其特征在于，所述第一焊缝(70)和所述第二焊缝(80)在所述密封件(50)背向所述导电壳体(10)的一面上具有凸起，所述凸起的顶点低于所述导电顶盖(21)背向所述导电壳体(10)的一面。
  12. 根据权利要求10所述的电池，其特征在于，所述第一凹陷部(211)内还具有第二凹陷部(212)，所述注液孔(23)位于所述第二凹陷部(212)内。
PCT/CN2022/134176 2021-12-17 2022-11-24 一种电池 WO2023109467A1 (zh)

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