WO2021004226A1 - 顶盖组件以及二次电池 - Google Patents

顶盖组件以及二次电池 Download PDF

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Publication number
WO2021004226A1
WO2021004226A1 PCT/CN2020/095798 CN2020095798W WO2021004226A1 WO 2021004226 A1 WO2021004226 A1 WO 2021004226A1 CN 2020095798 W CN2020095798 W CN 2020095798W WO 2021004226 A1 WO2021004226 A1 WO 2021004226A1
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WO
WIPO (PCT)
Prior art keywords
top cover
electrode
cover assembly
assembly according
extraction hole
Prior art date
Application number
PCT/CN2020/095798
Other languages
English (en)
French (fr)
Inventor
苏华圣
黄守君
郑于炼
Original Assignee
宁德时代新能源科技股份有限公司
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Application filed by 宁德时代新能源科技股份有限公司 filed Critical 宁德时代新能源科技股份有限公司
Publication of WO2021004226A1 publication Critical patent/WO2021004226A1/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
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H01M50/552—Terminals characterised by their shape
    • H01M50/553—Terminals adapted for prismatic, pouch or rectangular cells
    • H01M50/557—Plate-shaped terminals
    • 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
    • H01M50/172—Arrangements of electric connectors penetrating the casing
    • H01M50/174—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells
    • H01M50/176—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells 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
    • H01M50/183—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
    • H01M50/183—Sealing members
    • H01M50/186—Sealing members characterised by the disposition of the sealing members
    • H01M50/188—Sealing members characterised by the disposition of the sealing members the sealing members being arranged between the lid and terminal
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H01M50/547—Terminals characterised by the disposition of the terminals on the cells
    • H01M50/55—Terminals characterised by the disposition of the terminals on the cells on the same side of the cell
    • 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
    • H01M50/572—Means for preventing undesired use or discharge
    • H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
    • H01M50/59—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries characterised by the protection means
    • H01M50/593—Spacers; Insulating plates
    • 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

  • This application relates to the field of battery technology, in particular to a top cover assembly and a secondary battery.
  • Lithium ion secondary batteries have been widely used in hybrid vehicles and electric vehicles. This is due to its advantages such as high energy, high capacity and high power.
  • the secondary battery includes a top cover plate, an electrode terminal provided on the top cover plate, a sealing ring for sealing the top cover plate and the electrode terminal, and a current collector connected to the electrode terminal.
  • the top cover plate has electrode extraction holes.
  • the electrode terminal covers the electrode lead-out hole. At least the problem in the prior art is that the portion of the top cover plate close to the electrode lead-out hole is deformed, resulting in a potential safety hazard during the use of the secondary battery.
  • the embodiment of the present application provides a top cover assembly and a secondary battery.
  • the convex part of the top cover assembly can increase the strength and rigidity of the part on the main body close to the electrode lead-out hole, and reduce the possibility of deformation when the part is subjected to the elastic restoring force of the sealing ring.
  • an embodiment of the present application proposes a top cover assembly for a secondary battery, wherein the top cover assembly includes:
  • the top cover plate has a main body and a convex part; the main body has a first surface and a second surface arranged opposite to each other along its thickness direction, and an electrode extraction hole penetrating the first surface and the second surface; an electrode terminal, which covers the electrode terminal The electrode lead-out hole; a sealing ring, the sealing ring is at least partially arranged between the electrode terminal and the body to seal the electrode lead-out hole; wherein the convex part is arranged on the second surface; the top surface of the convex part protrudes from the second surface, convex The thickness of the part is 0.01mm to 2mm.
  • the convex portion includes a ring body surrounding the electrode extraction hole, or the convex portion includes more than two bosses, and the two or more bosses are arranged at intervals along the circumference of the electrode extraction hole.
  • the top surface includes a flat area and/or an inclined surface area.
  • the electrode terminal is connected to the body.
  • the top cover assembly further includes a fixing component connected to the top cover plate and forming a welding zone.
  • the convex part exceeds the welding zone or is aligned with the outermost boundary of the welding zone.
  • the top cover plate has a concave portion surrounding the electrode lead-out hole, and the fixing member is connected to the side wall of the concave portion.
  • the maximum thickness of the part of the body outside the recess is D
  • the maximum thickness between the bottom wall and the top surface of the recess is H, where 0.4 ⁇ H/D ⁇ 0.9
  • the maximum thickness between the bottom wall and the top surface of the recess is H, where 0.7mm ⁇ H ⁇ 1.5mm.
  • the maximum compression amount of the part of the sealing ring between the electrode terminal and the body is S
  • the top cover plate has a concave portion surrounding the electrode lead-out hole, and the sealing ring is at least partially located between the bottom wall of the concave portion and the electrode terminal.
  • the outer peripheral surface of the sealing ring is located outside the innermost edge of the convex portion.
  • the second surface is smoothly connected to the outer surface of the convex portion.
  • the top cover assembly further includes an insulating member disposed on a side away from the first surface, the insulating member has a groove, and the convex portion is at least partially located in the groove.
  • the extension portion extends along the circumference of the electrode extraction hole to form a ring structure, the extension portion and the first surface are located on the same side of the second surface, and the electrode terminal has a radial extension along the electrode extraction hole.
  • the sealing ring is at least partially arranged between the extension part and the body.
  • the convex portion is arranged around the electrode lead-out hole.
  • the lower surface of the electrode terminal is higher than the lower surface of the insulating member.
  • the electrode terminal is located on one side of the top cover plate.
  • the top cover assembly includes a top cover plate, an electrode terminal and a sealing ring.
  • the top cover includes a body and a convex part.
  • the convex part surrounds the electrode lead-out hole provided on the body.
  • the electrode terminal has an extension part.
  • the part of the sealing ring arranged between the extension part and the main body has an elastic restoring force along the axial direction of the electrode extraction hole. The elastic restoring force will act on the body close to the electrode lead-out hole.
  • the convex part can increase the strength and rigidity of the area on the main body close to the electrode lead-out hole, and reduce the possibility of deformation when the part of the main body close to the electrode lead-out hole receives a force along the axial direction of the electrode lead-out hole, thereby reducing The possibility of seal failure improves the safety of the secondary battery.
  • an embodiment of the present application provides a secondary battery, which includes:
  • the housing has an opening; the electrode assembly is accommodated in the housing; like the cap assembly of the above embodiment, the cap assembly seals the opening; the second surface faces the electrode assembly.
  • the top cover assembly further includes an insulating member disposed on a side away from the first surface
  • the secondary battery further includes a current collecting member
  • the current collecting member has a main body part and an extension part connected to each other. The part is located on the side of the insulating member away from the second surface, and the extension part extends into the electrode lead-out hole and is connected to the electrode terminal; wherein, along the axial direction of the electrode lead-out hole, there is a first gap between the main body and the insulating part; and /Or, along the axial direction of the electrode lead-out hole, there is a second gap between the insulator and the top cover plate.
  • FIG. 1 is a schematic diagram of the overall structure of a secondary battery according to an embodiment of the present application.
  • FIG. 2 is a schematic diagram of an exploded structure of a secondary battery according to an embodiment of the present application.
  • Fig. 3 is a schematic structural diagram of a top cover plate of an embodiment of the present application.
  • FIG. 4 is a schematic cross-sectional view of the top cover assembly of an embodiment of the present application.
  • Figure 5 is an enlarged view of A in Figure 4.
  • Figure 6 is an enlarged view of B in Figure 5;
  • FIG. 7 is a schematic bottom view of the top cover of an embodiment of the present application.
  • FIG. 8 is a schematic bottom view of the top cover of another embodiment of the present application.
  • FIG. 9 is a schematic bottom view of the top cover of another embodiment of the present application.
  • FIG. 10 is a schematic partial sectional view of a top cover assembly according to an embodiment of the present application.
  • FIG. 11 is a schematic partial sectional view of a top cover assembly according to another embodiment of the present application.
  • FIG. 12 is a schematic cross-sectional structure diagram of a sealing ring of an embodiment of the present application.
  • FIG. 13 is a schematic cross-sectional view of a sealing ring according to another embodiment of the present application.
  • FIG. 14 is a partial exploded structural diagram of a top cover assembly of an embodiment of the present application.
  • 15 is a schematic partial cross-sectional view of a secondary battery according to an embodiment of the present application.
  • Top cover plate 31. Body; 311, first surface; 312, second surface; 313, electrode extraction hole; 32, convex part; 321, ring body; 322, boss; 323, top surface; 324, Edge; 33, recess; 331, bottom wall;
  • Terminal assembly 50. Terminal assembly; 51. Fixed part; 52. Electrode terminal; 52a. Extension part;
  • connection should be understood in a broad sense unless otherwise clearly specified and limited. For example, they may be fixed connections or alternatively. Disassembly connection, or integral connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meaning of the above-mentioned terms in this application can be understood according to the specific circumstances.
  • the secondary battery 10 of the embodiment of the present application includes a casing 11, an electrode assembly 12 arranged in the casing 11, and a top cover assembly 20 sealedly connected to the casing 11.
  • the housing 11 in this embodiment has a square structure or other shapes.
  • the case 11 has an internal space for accommodating the electrode assembly 12 and the electrolyte, and an opening communicating with the internal space.
  • the housing 11 may be made of materials such as aluminum, aluminum alloy, or plastic.
  • the electrode assembly 12 of this embodiment can be formed by stacking the first pole piece, the second pole piece and the diaphragm together or spirally winding around the winding axis, wherein the diaphragm is between the first pole piece and the second pole piece. Between the insulators.
  • the electrode assembly 12 of this embodiment is a flat structure as a whole, which has a predetermined thickness, height, and width.
  • the first pole piece is used as a positive electrode piece and the second pole piece is a negative electrode piece for illustration.
  • the first pole piece may also be a negative pole piece
  • the second pole piece is a positive pole piece.
  • the positive sheet active material is coated on the coating area of the positive sheet
  • the negative sheet active material is coated on the coating area of the negative sheet.
  • the uncoated area extending from the coated area of the main body is used as a tab.
  • the electrode assembly 12 includes two tabs, namely a positive tab and a negative tab.
  • the positive tab extends from the coating area of the positive plate
  • the negative tab extends from the negative tab.
  • the coated area of the sheet extends out.
  • the top cover assembly 20 of the embodiment of the present application includes a top cover plate 30 and a terminal assembly 50 connected to the top cover plate 30.
  • the top cover plate 30 can cover the opening of the housing 11 and is connected to the housing 11 in a sealed manner to enclose the electrode assembly 12 in the housing 11.
  • the top cover plate 30 has electrode extraction holes 313.
  • the terminal assembly 50 includes a fixing member 51 and an electrode terminal 52.
  • the electrode terminal 52 is connected to the body 31 and covers the electrode extraction hole 313.
  • the electrode terminal 52 is connected to the top cover plate 30 through the fixing member 51.
  • the electrode assembly 12 may be connected to the electrode terminal 52 through a current collector.
  • the fixing member 51 has a hollow cavity, and the electrode terminal 52 is accommodated in the hollow cavity.
  • the hollow cavity of the fixing member 51 and the electrode extraction hole 313 are arranged correspondingly along the axial direction Y of the electrode extraction hole 313.
  • the top cover plate 30 has a plate-shaped body 31 and a convex portion 32.
  • the main body 31 has a first surface 311 and a second surface 312 opposite to each other in the thickness direction of the body 31.
  • the main body 31 is provided with an electrode lead-out hole 313.
  • the electrode extraction hole 313 penetrates the first surface 311 and the second surface 312.
  • the thickness direction of the main body 31 is the same as the axial direction Y of the electrode extraction hole 313.
  • the top cover 30 is connected to the housing 11 in a sealed manner through the body 31. When the top cover assembly 20 is applied to a secondary battery, it can be connected with the case 11 and the second surface 312 of the body 31 is used to face the electrode assembly 12.
  • the top cover plate 30 is welded to the housing 11 through the body 31.
  • the convex portion 32 is disposed on the second surface 312 of the main body 31.
  • the protrusion 32 is arranged around the electrode lead-out hole 313.
  • the convex portion 32 protrudes and extends along the axial direction Y of the electrode extraction hole 313 but away from the first surface 311.
  • the top surface 323 of the protrusion 32 protrudes from the second surface 312.
  • the thickness M of the convex portion 32 is 0.01 mm to 2 mm.
  • the thickness M of the convex portion 32 refers to the maximum vertical distance that the convex portion 32 protrudes from the second surface 312 in the thickness direction.
  • the convex portion 32 of the top cover plate 30 and the body 31 are integrally formed.
  • the top cover assembly 20 further includes a sealing ring 40.
  • the sealing ring 40 extends along the circumferential direction of the electrode extraction hole 313.
  • the central hole of the sealing ring 40 is arranged corresponding to the electrode lead-out hole 313.
  • the electrode terminal 52 has an extension part 52 a extending beyond the hole wall of the electrode extraction hole 313 in the radial direction X of the electrode extraction hole 313.
  • the extension portion 52a extends along the circumferential direction of the electrode extraction hole 313 to form a ring structure.
  • the extension portion 52 a is located on the side of the body 31 away from the second surface 312. When the top cover assembly 20 is applied to a secondary battery, the extension portion 52 a is located on the side of the body 31 away from the electrode assembly 12.
  • the sealing ring 40 is at least partially disposed between the extension portion 52a and the body 31 to seal the electrode lead-out hole 313.
  • the extension portion 52 a of the electrode terminal 52 and the body 31 co-extrude the part of the sealing ring 40 located between the extension portion 52 a and the body 31 along the axial direction Y of the electrode extraction hole 313. Since the compressed part of the sealing ring 40 has an elastic restoring force, the elastic restoring force will act on the part of the body 31 corresponding to the compressed part and cause the part to have an axial direction Y of the electrode lead-out hole 313. The trend of deformation.
  • the protrusion 32 helps to enhance the deformation resistance of the portion of the body 31 corresponding to the compression portion, and reduces the possibility of deformation or fracture due to elastic restoring force, thereby reducing Possibility of seal failure.
  • the top cover assembly 20 of the embodiment of the present application includes a top cover plate 30, an electrode terminal 52 and a sealing ring 40.
  • the top cover 30 includes a body 31 and a convex portion 32.
  • the protrusion 32 surrounds the electrode lead-out hole 313 provided on the main body 31.
  • the electrode terminal 52 has an extension part 52a.
  • the part of the sealing ring 40 provided between the extension portion 52 a and the main body 31 has an elastic restoring force along the axial direction Y of the electrode extraction hole 313. The elastic restoring force will act on the part of the main body 31 close to the electrode extraction hole 313.
  • the convex portion 32 can increase the strength and rigidity of the part on the main body 31 close to the electrode lead-out hole 313, and reduce the occurrence of force when the part on the main body 31 close to the electrode lead-out hole 313 receives a force along the axis Y of the electrode lead-out hole 313. The possibility of deformation, thereby reducing the possibility of sealing failure, and improving the safety of the secondary battery.
  • the protruding portion 32 can locally increase the strength and rigidity of the easily deformable area on the main body 31, the portion of the main body 31 outside the protruding portion 32 can be reduced in size in the thickness direction, compared with the prior art
  • the top cover plate 30 of this embodiment has a more compact structure in the thickness direction, which is beneficial to increase the energy density of the secondary battery 10.
  • the convex portion 32 includes a ring body 321 disposed around the electrode extraction hole 313.
  • the ring body 321 extends along the circumferential direction of the electrode extraction hole 313.
  • the number of the ring body 321 is one.
  • the ring body 321 and the body 31 can be integrally formed by a forming process.
  • the number of ring bodies 321 is two.
  • the diameters of the two ring bodies 321 are different.
  • the ring body 321 with the smaller diameter of the two ring bodies 321 is arranged inside the ring body 321 with the larger diameter.
  • the two ring bodies 321 may be coaxially arranged.
  • the number of ring bodies 321 is also not limited to one or two, and may be three or more.
  • the arrangement of more than three ring bodies 321 is the same as the arrangement of the two ring bodies 321 shown in FIG. 8.
  • the ring body 321 with a smaller diameter is provided inside the ring body 321 with a larger diameter.
  • the protrusion 32 includes more than two protrusions 322. More than two bosses 322 are arranged at intervals along the circumferential direction of the electrode extraction hole 313. More than two bosses 322 are distributed in a ring shape. Optionally, two or more bosses 322 are evenly distributed along the circumferential direction of the electrode extraction hole 313.
  • the second surface 312 of the main body 31 and the outer surface of the convex portion 32 are smoothly connected to each other, thereby reducing stress concentration in the transition area between the convex portion 32 and the main body 31.
  • the entire top surface 323 of the convex portion 32 may be a flat area.
  • the top surface 323 of the convex portion 32 is an inclined surface area as a whole.
  • the top surface 323 of the convex portion 32 is an inner surface facing the axis of the electrode extraction hole 313 as a whole.
  • the outer edge of the top surface 323 of the convex portion 32 away from the axis of the electrode extraction hole 313 is higher than the inner edge of the axis close to the electrode extraction hole 313.
  • the top surface 323 of the convex portion 32 is an inclined surface area as a whole.
  • the top surface 323 of the convex portion 32 is an outer surface facing the axis of the electrode extraction hole 313 as a whole.
  • the outer edge of the top surface 323 of the convex portion 32 away from the axis of the electrode extraction hole 313 is lower than the inner edge of the axis close to the electrode extraction hole 313.
  • the top surface 323 of the convex portion 32 includes a flat area and an inclined surface area. A part of the area of the top surface 323 may be a flat area, and the remaining area is an inclined surface area.
  • the top cover plate 30 has a recess 33 surrounding the electrode extraction hole 313.
  • the recess 33 is recessed from the first surface 311 toward the second surface 312.
  • the recess 33 has a bottom wall 331 and a side wall connected to the bottom wall 331.
  • the bottom wall 331 of the recess 33 is the surface closest to the second surface 312.
  • the terminal assembly 50 is at least partially disposed in the recess 33 and covers the electrode extraction hole 313.
  • the fixing member 51 is in contact with the bottom wall 331 of the recess 33. Since the terminal assembly 50 is disposed in the recess 33, the structural compactness of the top cover assembly 20 in the thickness direction is further improved.
  • the fixing member 51 is welded to the part of the side wall of the recess 33 formed by the top cover plate 30 and forms a welded area 99.
  • the welding area 99 has an innermost boundary close to the axis of the electrode extraction hole 313 and an outermost boundary away from the axis of the electrode extraction hole 313.
  • the convex portion 32 exceeds the welding area 99, so that the outermost edge of the convex portion 32 exceeds the outermost boundary of the welding area 99 and is located at the outermost boundary of the welding area 99. Outside.
  • the protrusion 32 can reduce the possibility of the body 31 being welded through; on the other hand, after the welding area 99 is formed, the structural strength of the area on the body 31 close to the welding area 99 will decrease, and the protrusion 32 can be provided. Conducive to improving the structural strength of the area.
  • the convex portion 32 is aligned with the outermost boundary of the welding area 99, so that the outermost edge of the convex portion 32 is aligned with the outermost boundary of the welding area 99.
  • the recess 33 is provided on the top cover plate 30, the area corresponding to the recess 33 on the main body 31 is relatively thinner, resulting in a relative reduction in the thickness dimension of the area in the thickness direction, thereby making the main body 31 correspond to the recess 33
  • the corresponding part forms a cantilever structure. This part is relatively easy to deform when subjected to an external force along the axial direction Y of the electrode extraction hole 313.
  • the convex portion 32 connected to the main body 31 is arranged corresponding to the concave portion 33 provided on the main body 31, so that the convex portion 32 can improve the deformation resistance of the portion of the main body 31 corresponding to the concave portion 33, and reduce the load of the portion along the electrode lead-out hole 313. The possibility of deformation or fracture occurs when the external force of the axial Y occurs.
  • the maximum thickness of the part of the body 31 outside the recess 33 is D.
  • the maximum thickness between the bottom wall 331 of the concave portion 33 and the top surface 323 of the convex portion 32 is H, where 0.4 ⁇ H/D ⁇ 0.9, and 0.7mm ⁇ H ⁇ 1.5mm.
  • the part of the body 31 outside the recess 33 is a structure of equal thickness.
  • the thickness of each position of the body 31 outside the recess 33 is D, that is, the vertical distance from the first surface 311 to the second surface 312 is D.
  • the body 31 has an explosion-proof valve and a liquid inlet hole.
  • the figure area formed by the projection outer contour of the explosion-proof valve on the body 31 is the first area
  • the figure area formed by the projection outer contour of the liquid inlet hole on the body 31 is the second area
  • the area of the figure formed by the projection of the outer contour of the concave portion 33 on the main body 31 is the third area.
  • the area of the main body 31 outside the recess 33, the explosion-proof valve, and the liquid inlet is the fourth area.
  • the first area, the second area, and the third area are all smaller than the fourth area.
  • the thickness of the area outside the recess 33, the explosion-proof valve and the liquid inlet on the body 31 is the maximum thickness D of the body 31.
  • the maximum thickness between the bottom wall 331 of the concave portion 33 and the top surface 323 of the convex portion 32 is H, 0.7mm ⁇ H ⁇ 1.5mm.
  • the maximum thickness D of the part of the body 31 outside the recess 33 can be flexibly selected on the premise of meeting the thickness requirement.
  • a part of the sealing ring 40 is disposed in the recess 33 to form a first sealing part, and the other part is disposed outside the recess 33 to form a second sealing part. Both the first sealing portion and the second sealing portion are ring-shaped.
  • the outer peripheral surface of the seal ring 40 is located outside the innermost edge 324 of the convex portion 32.
  • the outer peripheral surface of the seal ring 40 is located inside the outermost edge of the convex portion 32.
  • the outer peripheral surface of the sealing ring 40 is a surface away from the axis of the electrode extraction hole 313 but extending around the axis of the electrode extraction hole 313.
  • the projection of the innermost edge 324 of the convex portion 32 is located within the projection of the first sealing portion.
  • the electrode terminals of the terminal assembly 50 and the top cover plate 30 co-squeeze the first sealing portion of the sealing ring 40 along the axial direction Y of the electrode extraction hole 313. Since the first sealing portion has its own elastic restoring force after being compressed, the elastic restoring force will act on the portion of the body 31 corresponding to the recess 33, and make this portion deform along the axis Y of the electrode extraction hole 313 trend.
  • the convex portion 32 helps to enhance the anti-deformation performance of the portion of the main body 31 corresponding to the concave portion 33, and reduces the elastic restoring force of the first sealing portion. 33 The possibility of deformation or fracture of the corresponding part, thereby reducing the possibility of seal failure.
  • the maximum compression of the first sealing portion is S
  • the maximum thickness between the bottom wall 331 of the concave portion 33 and the top surface 323 of the convex portion 32 ranges from 0.7 mm ⁇ H ⁇ 1.5 mm. Since the greater the compression of the first sealing portion, the greater the elastic restoring force it has, so the maximum thickness between the bottom wall 331 of the concave portion 33 and the top surface 323 of the convex portion 32 needs to be increased accordingly to effectively offset The elastic recovery force.
  • the amount of compression refers to the ratio between the return height value measured in the axial direction Y when the first sealing part returns from the compressed state to the free state and the height value measured in the axial direction Y of the part in the free state.
  • the height value S1 measured along the axis Y of the first sealing part in the free state minus the height value S2 measured along the axis Y of the first sealing part in the compressed state is the return height value, that is, the return height value is equal to S1 Difference from S2.
  • S is equal to the ratio of the recovery height value to S1.
  • the sealing ring 40 is integrally disposed in the recess 33 of the body 31.
  • the extension part 52a of the electrode terminal 52 and the top cover plate 30 co-press the entire sealing ring 40 along the axial direction of the electrode lead-out hole 313 to seal the electrode lead-out hole. Since the sealing ring 40 has an elastic restoring force after being compressed, the elastic restoring force will act on the part of the body 31 corresponding to the recess 33 and make this part have a tendency to deform along the axial direction of the electrode extraction hole 313.
  • the protruding portion 32 helps to enhance the anti-deformation performance of the portion of the body 31 corresponding to the concave portion 33, and reduces the elastic restoring force of the sealing ring 40 that causes the main body 31 to interact with the concave portion 33.
  • the maximum compression amount of the sealing ring 40 is S
  • the maximum thickness between the bottom wall 331 of the concave portion 33 and the top surface 323 of the convex portion 32 ranges from 0.7 mm ⁇ H ⁇ 1.5 mm. Since the greater the compression of the sealing ring 40, the greater the elastic restoring force it has, so the maximum thickness between the bottom wall 331 of the concave portion 33 and the top surface 323 of the convex portion 32 also needs to be increased accordingly to effectively offset this Elastic recovery force.
  • the amount of compression refers to the ratio between the return height value measured in the axial direction Y when the sealing ring 40 returns from the compressed state to the free state and the height value measured in the axial direction Y of the part in the free state.
  • the height value S1 measured along the axis Y of the sealing ring 40 in the free state minus the height value S2 measured along the axis Y of the sealing ring 40 in the compressed state is the return height value, that is, the return height value is equal to S1 and S2 The difference. S is equal to the ratio of the recovery height value to S1.
  • the recess 33 is not provided on the body 31.
  • a part of the sealing ring 40 is provided between the extension part 52a of the electrode terminal 52 and the body 31 to form a first sealing part, and the other part is provided outside the extension part 52a of the electrode terminal 52 and the body 31 to form a second sealing part.
  • the protruding portion 32 helps to enhance the anti-deformation performance of the portion of the body 31 corresponding to the first sealing portion, and reduce the elastic restoring force of the first sealing portion.
  • the portion corresponding to the first sealing portion is likely to be deformed or broken, thereby reducing the possibility of sealing failure.
  • the sealing ring 40 is integrally disposed between the extension portion 52 a of the electrode terminal 52 and the body 31.
  • the extension part 52 a of the electrode terminal 52 and the top cover plate 30 co-press the sealing ring 40 along the axial direction Y of the electrode lead-out hole 313. Since the sealing ring 40 has an elastic restoring force after being compressed, the elastic restoring force will act on the body 31, so that the part of the body 31 corresponding to the sealing ring 40 has a deformation along the axis Y of the electrode extraction hole 313 trend.
  • the convex portion 32 helps to enhance the anti-deformation performance of the part of the body 31 corresponding to the sealing ring 40, and reduce the elastic restoring force of the sealing ring 40 which causes the sealing ring 40
  • the corresponding part of the ring 40 may be deformed or broken, thereby reducing the possibility of seal failure.
  • the top cover assembly 20 further includes an insulating member 60.
  • the insulating member 60 is disposed on a side of the second surface 312 away from the first surface 311.
  • the insulating member 60 can isolate the top cap plate 30 and the electrode assembly 12.
  • the insulator 60 and the terminal assembly 50 are respectively disposed on both sides of the top cover plate 30.
  • the surface of the insulating member 60 facing the top cover plate 30 has a groove 61.
  • the convex portion 32 is at least partially located in the groove 61, so that in the axial direction Y of the electrode lead-out hole 313, it is beneficial to improve the compactness of the structure between the insulator 60 and the top cover plate 30, thereby helping to improve the secondary battery 10 The energy density.
  • the convex portion 32 is located in the groove 61 as a whole, and the shape of the convex portion 32 and the groove 61 match.
  • the number of the grooves 61 on the insulating member 60 is the same as the number of the protrusions 32 and is arranged in one-to-one correspondence.
  • the secondary battery further includes a current collecting member 70 for connecting with the tab.
  • the current collector 70 has a main body 71 and an extension 72 connected to each other.
  • the main body 71 is located on a side of the insulating member 60 away from the second surface 312.
  • the extension 72 extends into the electrode extraction hole 313 and is connected to the electrode terminal 52.
  • the second gap 90 is provided along the axis Y of the electrode extraction hole 313, there is a first gap 80 between the main body 71 and the insulating member 60; and/or, along the axis Y of the electrode extraction hole 313, there is a gap between the insulating member 60 and the top cover 30 The second gap 90.
  • the main body 71 will not be interfered by the insulator 60, resulting in poor contact between the extension 72 and the electrode terminal 52 or the connection between the extension 72 and the electrode terminal 52
  • the possibility that the extension 72 and the electrode terminal 52 are easily disconnected due to the large axial tensile stress can ensure the reliability of the connection between the extension 72 and the electrode terminal 52.
  • the extension portion 52 a of the electrode terminal 52 is disposed on one side of the main body 31.
  • the extension portion 52 a of the electrode terminal 52 is far away from the second surface 312, and the extension portion 52 a and the first surface 311 are located on the same side of the second surface 312.
  • the thickness M of the convex portion 32 is 0.01 mm to 2 mm.
  • the convex portion 32 on the body 31 can also be reduced.
  • the space occupancy rate in the thickness direction is beneficial to increase the energy density of the secondary battery.
  • the recess 33 has a bottom wall 331.
  • a part of the sealing ring 40 is located between the bottom wall 331 of the recess 33 and the electrode terminal 52.
  • the entire sealing ring 40 is located between the bottom wall 331 of the recess 33 and the electrode terminal 52.
  • the fixing member 51 is connected to the top cover plate 30 and forms a welding area 99.
  • the welding area 99 refers to a structure formed by melting a part of the fixing member 51 and a part of the top cover plate 30 and joining each other.
  • the fixing component 51 is welded to the top cover plate 30.
  • the lower surface of the electrode terminal 52 is higher than the lower surface of the insulating member 60.
  • the lower surface of the electrode terminal 52 refers to the surface of the electrode terminal 52 facing the sealing ring 40 with reference to the position shown in FIG. 15.
  • the lower surface of the insulating member 60 refers to the surface of the insulating member 60 away from the electrode terminal 50 with reference to the position shown in FIG. 15.
  • the electrode terminal 52 is located on one side of the top cover plate 30.

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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)
  • Connection Of Batteries Or Terminals (AREA)

Abstract

一种顶盖组件（20），用于二次电池（10），其中，顶盖组件（20）包括：顶盖板（30），顶盖板（30）具有本体（31）和凸部（32）；本体（31）具有沿自身厚度方向相对设置的第一表面（311）和第二表面（312），以及贯穿第一表面（311）和第二表面（312）的电极引出孔（313）；电极端子（52），电极端子（52）覆盖电极引出孔（313）；密封圈（40），密封圈（40）至少部分地设置于电极端子（52）和本体（31）之间，以密封电极引出孔（313）；其中，凸部（32）设置于第二表面（312）；凸部（32）的顶面凸出于第二表面（312），凸部（32）的厚度为0.01mm至2mm。顶盖组件（20）的凸部（32）可增加本体（31）靠近电极引出孔（313）的部位强度和刚度，降低该部位受密封圈（40）弹性回复力作用时发生变形的可能性。

Description

顶盖组件以及二次电池
相关申请的交叉引用
本申请要求享有于2019年07月09日提交的名称为“顶盖组件以及二次电池”的中国专利申请201921066979.7的优先权，该申请的全部内容通过引用并入本文中。
技术领域
本申请涉及电池技术领域，特别是涉及一种顶盖组件以及二次电池。
背景技术
锂离子二次电池已被广泛应用于混合动力汽车和电动汽车领域。这是由于其具有高能量、高容量及高功率等优点。二次电池包括顶盖板、设置于顶盖板的电极端子、用于密封顶盖板和电极端子的密封圈和连接于电极端子的集流件。顶盖板具有电极引出孔。电极端子覆盖电极引出孔。现有技术至少存在的问题是，存在顶盖板靠近电极引出孔的部分发生变形的情况，导致二次电池使用过程存在安全隐患。
发明内容
本申请实施例提供一种顶盖组件以及二次电池。顶盖组件的凸部可以对本体上靠近电极引出孔的部位起到增加强度和刚度的作用，降低该部位受到密封圈的弹性回复力作用时发生变形的可能性。
一方面，本申请实施例提出了一种顶盖组件，用于二次电池，其中，顶盖组件包括：
顶盖板，顶盖板具有本体和凸部；本体具有沿自身厚度方向相对设置的第一表面和第二表面，以及贯穿第一表面和第二表面的电极引出孔；电极端子，电极端子覆盖电极引出孔；密封圈，密封圈至少部分地设置于电 极端子和本体之间，以密封电极引出孔；其中，凸部设置于第二表面；凸部的顶面凸出于第二表面，凸部的厚度为0.01mm至2mm。
根据本申请实施例的一个方面，凸部包括环绕电极引出孔的环体，或者，凸部包括两个以上的凸台，两个以上的凸台沿电极引出孔的周向间隔设置。
根据本申请实施例的一个方面，顶面包括平面区域和/或斜面区域。
根据本申请实施例的一个方面，电极端子连接于本体。
根据本申请实施例的一个方面，顶盖组件还包括固定部件，固定部件与顶盖板连接并且形成熔接区，沿径向，凸部超过熔接区或与熔接区的最外侧边界相对齐。
根据本申请实施例的一个方面，顶盖板具有环绕电极引出孔的凹部，固定部件连接于凹部的侧壁。
根据本申请实施例的一个方面，本体上位于凹部之外的部分的最大厚度为D，凹部的底壁与顶面之间的最大厚度为H，其中，0.4≤H/D≤0.9，和/或，凹部的底壁与顶面之间的最大厚度为H，其中，0.7mm≤H≤1.5mm。
根据本申请实施例的一个方面，密封圈位于电极端子和本体之间的部分的最大压缩量为S，凹部的底壁与顶面之间的最大厚度为H，其中，S＝kH，0＜k＜1。
根据本申请实施例的一个方面，顶盖板具有环绕电极引出孔的凹部，密封圈至少部分位于凹部的底壁和电极端子之间。
根据本申请实施例的一个方面，沿径向，密封圈的外周面位于凸部的最内侧的边缘的外侧。
根据本申请实施例的一个方面，第二表面与凸部的外表面圆滑过渡连接。
根据本申请实施例的一个方面，顶盖组件还包括设置于远离第一表面一侧的绝缘件，绝缘件具有凹槽，凸部至少部分地位于凹槽内。
根据本申请实施例的一个方面，外延部沿电极引出孔的周向延伸以形成环状结构，外延部和第一表面位于第二表面的同一侧，电极端子具有沿 电极引出孔的径向超出电极引出孔的孔壁的外延部，密封圈至少部分地设置于外延部和本体之间。
根据本申请实施例的一个方面，凸部环绕电极引出孔设置。
根据本申请实施例的一个方面，沿电极引出孔的轴向，电极端子的下表面高于绝缘件的下表面。
根据本申请实施例的一个方面，电极端子位于顶盖板的一侧。
根据本申请实施例的顶盖组件包括顶盖板、电极端子和密封圈。顶盖板包括本体和凸部。凸部环绕本体上设有的电极引出孔。电极端子具有外延部。密封圈上设置于外延部和本体之间的部分自身具有沿电极引出孔的轴向的弹性回复力。该弹性回复力会作用于本体上靠近电极引出孔的部位。凸部可以对本体上靠近电极引出孔的区域起到增加强度和刚度的作用，降低本体上靠近电极引出孔的部位受到沿电极引出孔的轴向的作用力时发生变形的可能性，从而降低密封失效的可能性，提高二次电池的使用安全性。
另一个方面，本申请实施例提供一种二次电池，其包括：
壳体，具有开口；电极组件，容纳于壳体内；如上述实施例的顶盖组件，顶盖组件密封开口；第二表面朝向电极组件。
根据本申请实施例的另一个方面，顶盖组件还包括设置于远离第一表面一侧的绝缘件，二次电池还包括集流件，集流件具有彼此连接的主体部和延伸部，主体部位于绝缘件远离第二表面的一侧，延伸部伸入电极引出孔中并与电极端子相连接；其中，沿电极引出孔的轴向，主体部与绝缘件之间具有第一间隙；和/或，沿电极引出孔的轴向，绝缘件与顶盖板之间具有第二间隙。
附图说明
下面将通过参考附图来描述本申请示例性实施例的特征、优点和技术效果。
图1是本申请一实施例的二次电池的整体结构示意图；
图2是本申请一实施例的二次电池的分解结构示意图；
图3是本申请一实施例的顶盖板的结构示意图；
图4是本申请一实施例的顶盖组件的剖视结构示意图；
图5是图4中A处放大图；
图6是图5中B处放大图；
图7是本申请一实施例的顶盖板的仰视结构示意图；
图8是本申请另一实施例的顶盖板的仰视结构示意图；
图9是本申请又一实施例的顶盖板的仰视结构示意图；
图10是本申请一实施例的顶盖组件的局部剖视结构示意图；
图11是本申请另一实施例的顶盖组件的局部剖视结构示意图；
图12是本申请一实施例的密封圈的剖视结构示意图；
图13是本申请另一实施例的密封圈的剖视结构示意图；
图14是本申请一实施例的顶盖组件的局部分解结构示意图；
图15是本申请一实施例的二次电池的局部剖视结构示意图。
在附图中，附图未必按照实际的比例绘制。
标记说明：
10、二次电池；11、壳体；12、电极组件；
20、顶盖组件；
30、顶盖板；31、本体；311、第一表面；312、第二表面；313、电极引出孔；32、凸部；321、环体；322、凸台；323、顶面；324、边缘；33、凹部；331、底壁；
40、密封圈；
50、端子组件；51、固定部件；52、电极端子；52a、外延部；
60、绝缘件；61、凹槽；
70、集流件；71、主体部；72、延伸部；
80、第一间隙；
90；第二间隙；
99、熔接区；
X、径向；Y、轴向。
具体实施方式
下面结合附图和实施例对本申请的实施方式作进一步详细描述。以下实施例的详细描述和附图用于示例性地说明本申请的原理，但不能用来限制本申请的范围，即本申请不限于所描述的实施例。
在本申请的描述中，需要说明的是，除非另有说明，“多个”的含义是两个以上；术语“上”、“下”、“左”、“右”、“内”、“外”等指示的方位或位置关系仅是为了便于描述本申请和简化描述，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申请的限制。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。
在本申请的描述中，还需要说明的是，除非另有明确的规定和限定，术语“安装”、“相连”、“连接”应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或一体地连接；可以是直接相连，也可以通过中间媒介间接相连。对于本领域的普通技术人员而言，可视具体情况理解上述术语在本申请中的具体含义。
为了更好地理解本申请，下面结合图1至图15对本申请实施例进行描述。
参见图1和图2所示，本申请实施例的二次电池10包括壳体11、设置于壳体11内的电极组件12以及与壳体11密封连接的顶盖组件20。
本实施例的壳体11为方形结构或其他形状。壳体11具有容纳电极组件12和电解液的内部空间以及与内部空间相连通的开口。壳体11可以由例如铝、铝合金或塑料等材料制造。
本实施例的电极组件12可通过将第一极片、第二极片以及隔膜一同堆叠或者围绕卷绕轴线螺旋卷绕而形成主体，其中，隔膜是介于第一极片和第二极片之间的绝缘体。本实施例的电极组件12整体为扁平状结构，其具有预定的厚度、高度和宽度。在本实施例中，示例性地以第一极片为正极片，第二极片为负极片进行说明。同样地，在其他的实施例中，第一极片还可以为负极片，而第二极片为正极片。另外，正极片活性物质被涂覆在正极片的涂覆区上，而负极片活性物质被涂覆到负极片的涂覆区上。由主体的涂覆区延伸出的未涂覆区则作为极耳，电极组件12包括两个极耳，即 正极耳和负极耳，正极耳从正极片的涂覆区延伸出，负极耳从负极片的涂覆区延伸出。
参见图2所示，本申请实施例的顶盖组件20包括顶盖板30以及连接于顶盖板30的端子组件50。顶盖板30可以覆盖壳体11的开口并与壳体11密封连接，以将电极组件12封闭于壳体11内。顶盖板30具有电极引出孔313。在一个示例中，参见图5所示，端子组件50包括固定部件51和电极端子52。电极端子52连接于本体31并覆盖电极引出孔313。电极端子52通过固定部件51与顶盖板30相连接。电极组件12可以通过集流件与电极端子52相连接。固定部件51具有中空空腔，而电极端子52容纳于中空空腔。固定部件51的中空空腔与电极引出孔313沿电极引出孔313的轴向Y相对应设置。
参见图3至图5所示，顶盖板30具有板状本体31和凸部32。本体31具有沿自身厚度方向相对设置的第一表面311和第二表面312。本体31上设置电极引出孔313。电极引出孔313贯穿第一表面311和第二表面312。本体31的厚度方向与电极引出孔313的轴向Y相同。顶盖板30通过本体31与壳体11密封连接。在顶盖组件20应用于二次电池时，可以与壳体11连接，而本体31的第二表面312用于朝向电极组件12。可选地，顶盖板30通过本体31与壳体11焊接连接。凸部32设置于本体31的第二表面312。凸部32环绕电极引出孔313设置。凸部32沿电极引出孔313的轴向Y但远离第一表面311凸出延伸。参见图6所示，凸部32的顶面323凸出于第二表面312。凸部32的厚度M为0.01mm至2mm。凸部32的厚度M指的是沿厚度方向，凸部32凸出于第二表面312的最大垂直距离。可选地，顶盖板30的凸部32与本体31为一体式成型结构。
参见图2和图5所示，顶盖组件20还包括密封圈40。密封圈40沿电极引出孔313的周向延伸。密封圈40的中心孔与电极引出孔313相对应设置。电极端子52具有沿电极引出孔313的径向X超出电极引出孔313的孔壁的外延部52a。外延部52a沿电极引出孔313的周向延伸以形成环状结构。外延部52a位于本体31远离第二表面312的一侧。在顶盖组件20应用于二次电池时，外延部52a位于本体31远离电极组件12的一侧。在端 子组件50与顶盖板30连接固定后，密封圈40至少部分地设置于外延部52a和本体31之间，以密封电极引出孔313。电极端子52的外延部52a和本体31沿电极引出孔313的轴向Y共同挤压密封圈40位于外延部52a和本体31之间的部分。由于密封圈40上被压缩的压缩部分自身具有弹性回复力，因此该弹性回复力会作用于本体31上与该压缩部分相对应的部分并使该部分具有沿电极引出孔313的轴向Y发生形变的趋势。在本体31上设置凸部32后，凸部32有助于增强本体31上与压缩部分相对应的部分的抗变形性能，降低因弹性回复力作用而导致发生变形或断裂的可能性，从而降低密封失效的可能性。
本申请实施例的顶盖组件20包括顶盖板30、电极端子52和密封圈40。顶盖板30包括本体31和凸部32。凸部32环绕本体31上设有的电极引出孔313。电极端子52具有外延部52a。密封圈40上设置于外延部52a和本体31之间的部分自身具有沿电极引出孔313的轴向Y的弹性回复力。该弹性回复力会作用于本体31上靠近电极引出孔313的部位。凸部32可以对本体31上靠近电极引出孔313的部位起到增加强度和刚度的作用，降低本体31上靠近电极引出孔313的部位受到沿电极引出孔313的轴向Y的作用力时发生变形的可能性，从而降低密封失效的可能性，提高二次电池的使用安全性。另外，由于可以通过凸部32对本体31上易于变形的区域进行局部增加强度和刚度，因此本体31上位于凸部32之外的部分可以在厚度方向减小尺寸，从而相比于现有技术的顶盖板30，本实施例的顶盖板30自身结构在厚度方向上更加紧凑，有利于提高二次电池10的能量密度。
在一个实施例中，凸部32包括环绕电极引出孔313设置的环体321。环体321沿电极引出孔313的周向延伸。在一个示例中，参见图7所示，环体321的数量为一个。环体321和本体31可以通过成型工艺一体成型。在另一个示例中，参见图8所示，环体321的数量为两个。两个环体321各自的直径大小不同。两个环体321中直径较小的环体321设置于直径较大的环体321的内部。两个环体321可以同轴设置。环体321的数量也并不限于一个或两个，也可以是三个以上。三个以上的环体321设置方式与图8中示出的两个环体321的设置方式相同。直径较小的环体321设置于 直径较大的环体321的内部。在另一个实施例中，参见图9所示，凸部32包括两个以上的凸台322。两个以上的凸台322沿电极引出孔313的周向间隔设置。两个以上的凸台322呈环状分布。可选地，两个以上的凸台322沿电极引出孔313的周向均匀分布。本体31的第二表面312与凸部32的外表面圆滑过渡连接，从而降低凸部32和本体31之间在过渡区域出现应力集中现象。
在一个实施例中，参见图5或图6所示，凸部32的顶面323整体可以是平面区域。在又一个实施例中，参见图10所示，凸部32的顶面323整体为斜面区域。凸部32的顶面323是整体朝向电极引出孔313的轴线的内侧表面。凸部32的顶面323远离电极引出孔313的轴线的外边缘高于靠近电极引出孔313的轴线的内边缘。参见图11所示，凸部32的顶面323整体为斜面区域。凸部32的顶面323是整体背向电极引出孔313的轴线的外侧表面。凸部32的顶面323远离电极引出孔313的轴线的外边缘低于靠近电极引出孔313的轴线的内边缘。在另一个实施例中，凸部32的顶面323包括平面区域和斜面区域。顶面323的一部分区域可以是平面区域，其余区域是斜面区域。
参见图3所示，顶盖板30具有环绕电极引出孔313的凹部33。凹部33从第一表面311朝第二表面312凹陷。凹部33具有底壁331和与底壁331相连接的侧壁。凹部33的底壁331是最靠近第二表面312的表面。端子组件50至少部分地设置于凹部33内并且覆盖电极引出孔313。固定部件51与凹部33的底壁331相接触。由于端子组件50设置于凹部33，因此进一步提升顶盖组件20在厚度方向上的结构紧凑性，从而在本实施例的顶盖组件20应用于二次电池10时，有利于进一步提高二次电池10的能量密度。参见图6所示，固定部件51与顶盖板30形成凹部33的侧壁的部分焊接连接并且形成熔接区99。熔接区99具有靠近电极引出孔313的轴线的最内侧边界和远离电极引出孔313的轴线的最外侧边界。在一个示例中，沿电极引出孔313的径向X，凸部32超过熔接区99，从而凸部32最外侧的边缘超过熔接区99的最外侧边界，并位于熔接区99的最外侧边界的外侧。这样，一方面，凸部32可以降低本体31被焊穿的可能性；另一方面， 在形成熔接区99后，本体31上接近熔接区99的区域结构强度会下降，设置凸部32可以有利于提高该区域的结构强度。在另一个示例中，沿电极引出孔313的径向X，凸部32与熔接区99的最外侧边界相对齐，从而凸部32最外侧的边缘与熔接区99的最外侧边界相对齐。由于顶盖板30上设置凹部33，因此使得本体31上与凹部33相对应的区域相对变薄，从而导致在厚度方向上该区域的厚度尺寸相对减小，进而使得本体31上与凹部33相对应的部分形成悬臂结构。该部分在受到沿电极引出孔313的轴向Y的外力作用时相对易于发生变形。连接于本体31的凸部32与本体31上设置的凹部33相对应设置，从而凸部32可以提高本体31上与凹部33相对应的部分的抗变形性能，降低该部分承载沿电极引出孔313的轴向Y的外力时发生变形或断裂的可能性。
在一个实施例中，参见图6所示，本体31上位于凹部33之外的部分的最大厚度为D。凹部33的底壁331与凸部32的顶面323之间的最大厚度为H，其中，0.4≤H/D≤0.9，并且0.7mm≤H≤1.5mm。在一个示例中，本体31上位于凹部33之外的部分为等厚结构体。本体31上位于凹部33之外的部分各个位置的厚度均为D，也即第一表面311至第二表面312的垂直距离均为D。在另一个示例中，本体31上具有防爆阀和进液孔。在电极引出孔313的轴向Y上，本体31上的防爆阀投影外轮廓所形成的图形面积为第一面积，而本体31上的进液孔投影外轮廓所形成的图形面积为第二面积，本体31上的凹部33投影外轮廓所形成的图形面积为第三面积。本体31上位于凹部33、防爆阀和进液孔之外的区域投影外轮廓所形成的图形面积为第四面积。第一面积、第二面积和第三面积均小于第四面积。本体31上位于凹部33、防爆阀和进液孔之外的区域的厚度为本体31的最大厚度D。
在另一个实施例中，凹部33的底壁331与凸部32的顶面323之间的最大厚度为H，0.7mm≤H≤1.5mm。本实施例中，最大厚度H的取值与本体31上位于凹部33之外的部分的最大厚度D的取值之间不存在比例关系。本体31上位于凹部33之外的部分的最大厚度D可以在满足厚度要求的前提下灵活选择。
在一个实施例中，参见图2和图6所示，密封圈40的一部分设置于凹部33内形成第一密封部，另一部分设置于凹部33外形成第二密封部。第一密封部和第二密封部均为环状。沿电极引出孔313的径向X，密封圈40的外周面位于凸部32的最内侧的边缘324的外侧。密封圈40的外周面位于凸部32的最外侧的边缘的内侧。密封圈40的外周面是远离电极引出孔313的轴线但环绕电极引出孔313的轴线延伸的表面。沿电极引出孔313的轴向Y，凸部32最内侧的边缘324的投影位于第一密封部的投影内。在端子组件50与顶盖板30连接固定后，端子组件50的电极端子和顶盖板30沿电极引出孔313的轴向Y共同挤压密封圈40的第一密封部。由于第一密封部被压缩后自身具有弹性回复力，因此该弹性回复力会作用于本体31上与凹部33相对应的部分，并使得该部分具有沿电极引出孔313的轴向Y发生形变的趋势。在本体31上设置凸部32后，凸部32有助于增强本体31上与凹部33相对应的部分的抗变形性能，降低因第一密封部的弹性回复力作用而导致本体31上与凹部33相对应的部分发生变形或断裂的可能性，从而降低密封失效的可能性。在一个示例中，参见图12所示，第一密封部的最大压缩量为S，凹部33的底壁331与凸部32的顶面323之间的最大厚度为H，其中，S＝kH，0＜k＜1。可选地，凹部33的底壁331与凸部32的顶面323之间的最大厚度取值范围为0.7mm≤H≤1.5mm。由于第一密封部压缩量越大，其自身具有的弹性回复力也越大，因此凹部33的底壁331与凸部32的顶面323之间的最大厚度也需要相应地增大，以有效抵消该弹性回复力。压缩量指的是第一密封部从压缩状态回复至自由状态时沿轴向Y测量的回复高度值与该部分在自由状态沿轴向Y测量的高度值之间的比值。第一密封部在自由状态沿轴向Y测量的高度值S1减去第一密封部在压缩状态沿轴向Y测量的高度值S2所得到的差值为回复高度值，即回复高度值等于S1与S2的差值。S等于回复高度值与S1的比值。
在另一个实施例中，密封圈40整体设置于本体31的凹部33内。在端子组件50与顶盖板30连接固定后，电极端子52的外延部52a和顶盖板30沿电极引出孔313的轴向共同挤压整个密封圈40，以密封电极引出孔。由于密封圈40被压缩后自身具有弹性回复力，因此该弹性回复力会作用于本 体31上与凹部33相对应的部分，并使得该部分具有沿电极引出孔313的轴向发生形变的趋势。在本体31上设置凸部32后，凸部32有助于增强本体31上与凹部33相对应的部分的抗变形性能，降低因密封圈40的弹性回复力作用而导致本体31上与凹部33相对应的部分发生变形或断裂的可能性，从而降低密封失效的可能性。在一个示例中，参见图13所示，密封圈40的最大压缩量为S，凹部33的底壁331与凸部32的顶面323之间的最大厚度为H，其中，S＝kH，0＜k＜1。可选地，凹部33的底壁331与凸部32的顶面323之间的最大厚度取值范围为0.7mm≤H≤1.5mm。由于密封圈40压缩量越大，其自身具有的弹性回复力也越大，因此凹部33的底壁331与凸部32的顶面323之间的最大厚度也需要相应地增大，以有效抵消该弹性回复力。压缩量指的是密封圈40从压缩状态回复至自由状态时沿轴向Y测量的回复高度值与该部分在自由状态沿轴向Y测量的高度值之间的比值。密封圈40在自由状态沿轴向Y测量的高度值S1减去密封圈40在压缩状态沿轴向Y测量的高度值S2所得到的差值为回复高度值，即回复高度值等于S1与S2的差值。S等于回复高度值与S1的比值。
在另一个实施例中，本体31上未设置凹部33。密封圈40的一部分设置于电极端子52的外延部52a和本体31之间形成第一密封部，另一部分设置于电极端子52的外延部52a和本体31之外形成第二密封部。在端子组件50与顶盖板30连接固定后，电极端子52和顶盖板30沿电极引出孔313的轴向Y共同挤压密封圈40的第一密封部。由于第一密封部被压缩后自身具有弹性回复力，因此该弹性回复力会作用于本体31上，使得本体31上与第一密封部相对应的部分具有沿电极引出孔313的轴向Y发生形变的趋势。在本体31上设置凸部32后，凸部32有助于增强本体31上与第一密封部相对应的部分的抗变形性能，降低因第一密封部的弹性回复力作用而导致本体31上与第一密封部相对应的部分发生变形或断裂的可能性，从而降低密封失效的可能性。
在另一个实施例中，密封圈40整体设置于电极端子52的外延部52a和本体31之间。在端子组件50与顶盖板30连接固定后，电极端子52的外延部52a和顶盖板30沿电极引出孔313的轴向Y共同挤压密封圈40。 由于密封圈40被压缩后自身具有弹性回复力，因此该弹性回复力会作用于本体31上，使得本体31上与密封圈40相对应的部分具有沿电极引出孔313的轴向Y发生形变的趋势。在本体31上设置凸部32后，凸部32有助于增强本体31上与密封圈40相对应的部分的抗变形性能，降低因密封圈40的弹性回复力作用而导致本体31上与密封圈40相对应的部分发生变形或断裂的可能性，从而降低密封失效的可能性。
参见图14所示，顶盖组件20还包括绝缘件60。绝缘件60设置于第二表面312的远离第一表面311的一侧。在顶盖组件20应用于二次电池10时，绝缘件60可以隔离顶盖板30与电极组件12。绝缘件60与端子组件50分别设置于顶盖板30的两侧。绝缘件60朝向顶盖板30的表面具有凹槽61。凸部32至少部分地位于凹槽61内，从而在电极引出孔313的轴向Y上，有利于提升绝缘件60和顶盖板30之间的结构紧凑性，进而有利于提高二次电池10的能量密度。可选地，凸部32整体位于凹槽61内，并且凸部32和凹槽61形状相匹配。绝缘件60上的凹槽61的数量与凸部32的数量相同并一一对应设置。
参见图2和图15所示，二次电池还包括用于与极耳相连接的集流件70。集流件70具有彼此连接的主体部71和延伸部72。主体部71位于绝缘件60远离第二表面312的一侧。延伸部72伸入电极引出孔313中并与电极端子52相连接。沿电极引出孔313的轴向Y，主体部71与绝缘件60之间具有第一间隙80；和/或，沿电极引出孔313的轴向Y，绝缘件60与顶盖板30之间具有第二间隙90。集流件70的延伸部72与电极端子52连接过程中，主体部71不会受到绝缘件60干涉限位而导致延伸部72与电极端子52接触不良或延伸部72与电极端子52的连接处承受较大的轴向拉应力而导致延伸部72与电极端子52易于脱开连接的可能性，保证延伸部72与电极端子52连接可靠性。
在本申请其它一些实施例中，参见图5所示，电极端子52的外延部52a设置于本体31的一侧。电极端子52的外延部52a远离第二表面312，并且外延部52a和第一表面311位于第二表面312的同一侧。
在本申请其它一些实施例中，参见图6所示，凸部32的厚度M为 0.01mm至2mm，可以在保证满足凸部32自身刚度要求的前提下，也可以降低凸部32在本体31的厚度方向上的空间占用率，有利于提高二次电池的能量密度。
在本申请其它一些实施例中，参见图6所示，凹部33具有底壁331。密封圈40的一部分位于凹部33的底壁331和电极端子52之间。可选地，密封圈40整体位于凹部33的底壁331和电极端子52之间。
在本申请其它一些实施例中，参见图6所示，固定部件51与顶盖板30连接并且形成熔接区99。熔接区99指的是固定部件51的一部分与顶盖板30的一部分熔融后并相互接合形成的结构。可选地，固定部件51与顶盖板30焊接连接。
在本申请其它一些实施例中，参见图15所示，沿电极引出孔313的轴向Y，电极端子52的下表面高于绝缘件60的下表面。电极端子52的下表面指的是以图15所示位置为参照，电极端子52朝向密封圈40的表面。绝缘件60的下表面指的是以图15所示位置为参照，绝缘件60远离电极端子50的表面。
在本申请其它一些实施例中，参见图15所示，电极端子52位于顶盖板30的一侧。
虽然已经参考优选实施例对本申请进行了描述，但在不脱离本申请的范围的情况下，可以对其进行各种改进并且可以用等效物替换其中的部件，尤其是，只要不存在结构冲突，各个实施例中所提到的各项技术特征均可以任意方式组合起来。本申请并不局限于文中公开的特定实施例，而是包括落入权利要求的范围内的所有技术方案。

Claims (18)

  1. 一种顶盖组件，用于二次电池，其中，所述顶盖组件包括：
    顶盖板，所述顶盖板具有本体和凸部；所述本体具有沿自身厚度方向相对设置的第一表面和第二表面，以及贯穿所述第一表面和所述第二表面的电极引出孔；
    电极端子，所述电极端子覆盖所述电极引出孔；
    密封圈，所述密封圈至少部分地设置于所述电极端子和所述本体之间，以密封所述电极引出孔；
    其中，所述凸部设置于所述第二表面；所述凸部的顶面凸出于所述第二表面，所述凸部的厚度为0.01mm至2mm。
  2. 根据权利要求1所述的顶盖组件，其中，所述凸部包括环绕所述电极引出孔的环体，或者，所述凸部包括两个以上的凸台，两个以上的所述凸台沿所述电极引出孔的周向间隔设置。
  3. 根据权利要求1或2所述的顶盖组件，其中，所述顶面包括平面区域和/或斜面区域。
  4. 根据权利要求1至3任一项所述的顶盖组件，其中，所述电极端子连接于所述本体。
  5. 根据权利要求1至4任一项所述的顶盖组件，其中，所述顶盖组件还包括固定部件，所述固定部件与所述顶盖板连接并且形成熔接区，沿所述径向，所述凸部超过所述熔接区或与所述熔接区的最外侧边界相对齐。
  6. 根据权利要求5所述的顶盖组件，其中，所述顶盖板具有环绕所述电极引出孔的凹部，所述固定部件连接于所述凹部的侧壁。
  7. 根据权利要求6所述的顶盖组件，其中，所述本体上位于所述凹部之外的部分的最大厚度为D，所述凹部的底壁与所述顶面之间的最大厚度为H，其中，0.4≤H/D≤0.9，和/或，所述凹部的底壁与所述顶面之间的最大厚度为H，其中，0.7mm≤H≤1.5mm。
  8. 根据权利要求6或7所述的顶盖组件，其中，所述密封圈位于所述电极端子和所述本体之间的部分的最大压缩量为S，所述凹部的底壁与所 述顶面之间的最大厚度为H，其中，S＝kH，0＜k＜1。
  9. 根据权利要求1至5任一项所述的顶盖组件，其中，所述顶盖板具有环绕所述电极引出孔的凹部，所述密封圈至少部分位于所述凹部的底壁和所述电极端子之间。
  10. 根据权利要求1至9任一项所述的顶盖组件，其中，沿所述径向，所述密封圈的外周面位于所述凸部的最内侧的边缘的外侧。
  11. 根据权利要求1至10任一项所述的顶盖组件，其中，所述第二表面与所述凸部的外表面圆滑过渡连接。
  12. 根据权利要求1至11任一项所述的顶盖组件，其中，所述顶盖组件还包括设置于远离所述第一表面一侧的绝缘件，所述绝缘件具有凹槽，所述凸部至少部分地位于所述凹槽内。
  13. 根据权利要求1至12任一项所述的顶盖组件，其中，所述外延部沿所述电极引出孔的周向延伸以形成环状结构，所述外延部和所述第一表面位于所述第二表面的同一侧，所述电极端子具有沿所述电极引出孔的径向超出所述电极引出孔的孔壁的外延部，所述密封圈至少部分地设置于所述外延部和所述本体之间。
  14. 根据权利要求1至13任一项所述的顶盖组件，其中，所述凸部环绕所述电极引出孔设置。
  15. 根据权利要求1至14任一项所述的顶盖组件，其中，沿所述电极引出孔的轴向，所述电极端子的下表面高于所述绝缘件的下表面。
  16. 根据权利要求1至15任一项所述的顶盖组件，其中，所述电极端子位于所述顶盖板的一侧。
  17. 一种二次电池，其中，包括：
    壳体，具有开口；
    电极组件，容纳于所述壳体内；
    如权利要求1至16任一项所述的顶盖组件，所述顶盖组件密封所述开口；所述第二表面朝向所述电极组件。
  18. 根据权利要求17所述的二次电池，其中，所述顶盖组件还包括设置于远离所述第一表面一侧的绝缘件，所述二次电池还包括集流件，所述 集流件具有彼此连接的主体部和延伸部，所述主体部位于所述绝缘件远离所述第二表面的一侧，所述延伸部伸入所述电极引出孔中并与所述电极端子相连接；
    其中，沿所述电极引出孔的轴向，所述主体部与所述绝缘件之间具有第一间隙；和/或，沿所述电极引出孔的轴向，所述绝缘件与所述顶盖板之间具有第二间隙。
PCT/CN2020/095798 2019-07-09 2020-06-12 顶盖组件以及二次电池 WO2021004226A1 (zh)

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