WO2023040864A1 - 电池及电子设备 - Google Patents

电池及电子设备 Download PDF

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Publication number
WO2023040864A1
WO2023040864A1 PCT/CN2022/118605 CN2022118605W WO2023040864A1 WO 2023040864 A1 WO2023040864 A1 WO 2023040864A1 CN 2022118605 W CN2022118605 W CN 2022118605W WO 2023040864 A1 WO2023040864 A1 WO 2023040864A1
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WIPO (PCT)
Prior art keywords
conductive member
battery
battery according
pole piece
conductive
Prior art date
Application number
PCT/CN2022/118605
Other languages
English (en)
French (fr)
Inventor
卫志达
彭宁
徐延铭
Original Assignee
珠海冠宇电池股份有限公司
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Application filed by 珠海冠宇电池股份有限公司 filed Critical 珠海冠宇电池股份有限公司
Publication of WO2023040864A1 publication Critical patent/WO2023040864A1/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
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/147—Lids or covers
    • H01M50/148—Lids or covers characterised by their shape
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/533—Electrode connections inside a battery casing characterised by the shape of the leads or tabs
    • 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
    • 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 disclosure relates to the technical field of batteries, in particular to a battery and electronic equipment.
  • the existing battery includes a lower case, a positive electrode conductive part, a negative electrode conductive part, an electrode assembly and a sealing part, wherein the electrode assembly is located in the lower case, the negative electrode conductive part is covered on the top of the lower case, and the middle part of the negative electrode conductive part is provided with a through hole. hole; the positive conductor is pasted on the outer surface of the negative conductor by insulating glue, and the middle part of the positive conductor communicates with the inside of the lower casing through the through hole on the negative conductor.
  • a liquid injection port is arranged on the positive electrode conductive part, and the sealing part is welded on the positive electrode conductive part to cover the liquid injection port.
  • the above-mentioned existing batteries are relatively weak in terms of internal pressure resistance, and the positive conductive part is prone to be pushed apart during battery use, resulting in poor reliability of the battery.
  • embodiments of the present application provide a battery and an electronic device with high reliability.
  • the first aspect of the present application provides a battery, including: a lower casing, the lower casing has an accommodating cavity; an electrode assembly, the electrode assembly is located in the accommodating cavity; and a cover assembly, the cover assembly is arranged on On the lower case, the cover plate assembly includes: a first conductive part, the first conductive part is connected to the top of the lower case, and the first conductive part is provided with a through hole; a second conductive part, the second conductive part is insulated and connected On the surface of the first conductive member close to the accommodating cavity, at least part of the structure of the second conductive member is exposed from the through hole, and the part of the second conductive member exposed from the through hole is provided with a liquid injection port; The sealing piece on the piece, the sealing piece covers the liquid injection port.
  • the second conductive member includes a first connection part, and a second connection part arranged around the outer edge of the first connection part, and the thickness of the first connection part is greater than the thickness of the second connection part;
  • a connection part is insulated and connected to the first conductive part, the second connection part is located in the through hole, and the sealing part is connected to a side of the first connection part away from the accommodating cavity.
  • the surface of the first connecting part facing the interior of the accommodating cavity is flush with the surface of the second connecting part facing the interior of the accommodating cavity; the thickness of the first connecting part ranges from 0.2 mm to 0.5 mm; and/or
  • the thickness range of the second connecting part is: 0.1mm ⁇ 0.3mm.
  • an isolation layer is further provided between the through hole and the first connection part, and the isolation layer is clamped between the side wall of the first connection part and the hole wall of the through hole.
  • an insulating adhesive layer is interposed between the first conductive member and the second connecting portion.
  • the thickness of the isolation layer and the insulating adhesive layer both range from 5 ⁇ m to 200 ⁇ m.
  • the top end surface of the first connecting part is flush with the top end surface of the first conductive member
  • the height of the top surface of the first connecting part relative to the bottom of the battery is higher than the height of the top surface of the first conductive member relative to the bottom of the battery;
  • the disposition height of the top surface of the first connecting portion relative to the bottom of the battery is lower than the disposition height of the top surface of the first conductive member relative to the bottom of the battery.
  • the height difference between the top end surface of the first connection part and the top end surface of the first conductive member is in a range of -0.1mm ⁇ 0.1mm.
  • the sealing member includes a body part and a protrusion protruding from the body part, and the protrusion part is located on a side of the body part away from the accommodating cavity.
  • the top surface of the protrusion is flush with the top surface of the first conductive member
  • the height of the top surface of the protrusion relative to the bottom of the battery is higher than the height of the top surface of the first conductive member relative to the bottom of the battery;
  • the height of the top surface of the protruding part relative to the bottom of the battery is lower than the height of the top surface of the first conductive member relative to the bottom of the battery.
  • the height difference between the top surface of the protruding part and the top surface of the first conductive member is in the range of -150 ⁇ m ⁇ 150 ⁇ m.
  • the difference between the thickness of the main body part and the thickness of the second connection part is: 0-500 ⁇ m.
  • the thickness of the main body is in a range of 0.05 mm to 0.2 mm.
  • the protrusion is in the shape of a truncated cone, and the cross-sectional diameter of the protrusion ranges from 1.0 mm to 3.0 mm; and/or
  • the main body is in the shape of a cone.
  • the liquid injection port is located at the center of the second conductive member.
  • the lower case includes a bottom wall and a side wall surrounding and connected to an edge of the bottom wall, and a top of the side wall is connected to an edge portion of the first conductive member.
  • the position near the edge of the first conductive member has a positioning recess, the positioning recess is located on the surface of the first conductive member facing the electrode assembly, and the top end of the side wall is connected to the positioning recess.
  • the depth of the positioning depression is: 0.05 mm ⁇ 0.1 mm.
  • the positioning recess extends to the edge side of the first conductive member, and a first chamfer structure is formed between the bottom wall and the side wall of the positioning recess, and the angle range of the first chamfer structure is: 5° ⁇ 90°.
  • a second chamfering structure is provided at the connection position between the side wall of the lower case and the bottom wall of the lower case, and the chamfering range of the second chamfering structure is: 5°-90°.
  • the electrode assembly includes a first tab and a second tab, the first tab is electrically connected to the first conductive member, and the second tab is electrically connected to the second conductive member,
  • Positioning marks are provided on the edge of the outer contour of the second conductive member, and the positioning marks are used to indicate the welding position of the second tab on the second conductive member.
  • the two positioning marks are arranged symmetrically with respect to the center of the second conductive member.
  • the electrode assembly includes a first tab, a second tab, a first pole piece, a second pole piece, and a diaphragm,
  • the first pole piece, the diaphragm, and the second pole piece are laminated and wound in sequence, the first tab is electrically connected to the first pole piece, the second pole piece is electrically connected to the second pole piece,
  • Both the winding head end and the winding tail end of the first pole piece have an empty foil area, and the winding head end and the winding tail end of the second pole piece both have an empty foil area,
  • the first tab is electrically connected to the empty foil area at the winding tail end of the first pole piece
  • the second tab is electrically connected to the empty foil area at the winding tail end of the second pole piece.
  • the second aspect of the present application provides an electronic device, including: an electronic device body and the above-mentioned battery, and the battery provides electric energy for the electronic device body.
  • the second conductive member is connected to the side of the first conductive member close to the accommodating cavity, in other words, the second conductive member is connected to the inner surface of the first conductive member, And at least part of the structure of the second conductive member is exposed to the outside of the battery through the through hole on the first conductive member.
  • the second conductive member bears a relatively large pressure toward the outside of the battery.
  • the part of the second conductive part corresponding to the first conductive part is blocked by the first conductive part connected and fixed with the lower case, thereby preventing the second conductive part from being flushed due to excessive internal pressure, and the whole of the first conductive part Partially offset, the pressure on the second conductive member is shared, which effectively improves the situation that the second conductive member is pushed up in the prior art.
  • FIG. 1 is a schematic diagram of the overall structure of a battery provided in an embodiment of the present application
  • FIG. 2 is a top view of a battery provided in an embodiment of the present application.
  • Fig. 3 is a sectional view along the A-A line of Fig. 2;
  • Fig. 4 is a partial enlarged view of place B in Fig. 3;
  • Fig. 5 is a schematic diagram of the overall structure of another structure of the battery provided in the embodiment of the present application.
  • Fig. 6 is a schematic structural diagram of the second conductive member in the battery provided by the embodiment of the present application.
  • the positive electrode conductor is connected to the inner side of the negative electrode conductor, and the positive electrode conductor located inside the battery will lean against the negative electrode conductor when the pressure is high, and the negative electrode conductor will share part of the pressure. , thereby slowing down the pressure on the positive electrode conductive member, preventing the positive electrode conductive member from being directly pushed away, thereby improving the reliability of the battery.
  • a button battery refers to a button-like battery with a larger diameter and a thinner thickness. Therefore, the button battery is classified from the appearance.
  • the present application is not limited thereto, and other types of batteries may also be used.
  • the batteries are other types of batteries, the principle of resisting pressure is similar to this, and will not be repeated here.
  • Figure 1 is a schematic diagram of the overall structure of a battery provided in the embodiment of the present application
  • Figure 2 is a top view of a battery provided in the embodiment of the present application
  • Figure 3 is a cross-sectional view along the line A-A in Figure 2
  • Figure 4 is a schematic view of the battery in Figure 3 Partial enlarged view at B.
  • an embodiment of the present application provides a battery 100 , which includes: a lower case 10 , a cover assembly 30 and an electrode assembly 20 .
  • an accommodating cavity 11 is formed inside the lower casing 10 , the cover assembly 30 can be covered on the top of the lower casing 10 , and the electrode assembly 20 is disposed in the accommodating cavity 11 .
  • the cover assembly 30 may include a first conductive part 31 , a second conductive part 32 and a sealing part 33 .
  • the first conductive member 31 is connected to the top of the lower housing 10, and the first conductive member 31 is provided with a through hole 311;
  • the second conductive member 32 is insulated and connected to the surface of the first conductive member 31 close to the accommodating cavity 11 , at least part of the structure of the second conductive member 32 is exposed from the through hole 311, the part of the second conductive member 32 exposed from the through hole is provided with a liquid injection port 323, the sealing member 33 is located on the second conductive member 32, and is covered Liquid injection port 323 .
  • the second conductive member 32 is connected to the side of the first conductive member 31 close to the accommodating cavity 11, in other words, the second conductive member 32 is connected to the inner surface of the first conductive member 31, and the second conductive member 32 At least part of the structure of the conductive member 32 is exposed to the outside of the battery 100 through the through hole 311 on the first conductive member 31.
  • the second conductive member 32 bears a large force toward the battery.
  • the part of the second conductive part 32 corresponding to the first conductive part 31 is blocked by the first conductive part 31 connected and fixed with the lower housing 10, thereby preventing the second conductive part 32 from being Breaking away, a part of the first conductive member 31 is offset by the whole, sharing the pressure on the second conductive member 32, which effectively improves the situation in which the second conductive member 32 is pushed up in the prior art.
  • the electrode assembly 20 may include a winding core 25 , a first tab 21 and a second tab 22 , and the winding core 25 includes a first pole piece 23 , a second pole piece 24 , and a separator 26 .
  • the winding core 25 can be a cylindrical winding body and is arranged in the accommodating cavity 11, and the accommodating cavity 11 also contains an electrolyte solution at the same time, and the first pole piece 23 and the second pole piece 24 are separated by an isolation film 26. unwrapped and rolled together.
  • the first pole piece 23 is electrically connected to the first pole lug 21, and the second pole piece 24 is electrically connected to the second pole lug 22. side leads. Specifically, both the winding head end and the winding tail end of the first pole piece 23 have an empty foil area, the winding head end and the winding tail end of the second pole piece 24 both have an empty foil area, and the first tab 21 It is electrically connected to the empty foil area at the winding tail end of the first pole piece 23 , and the second tab 22 is electrically connected to the empty foil area at the winding tail end of the second pole piece 24 .
  • connection position of the first tab 21 on the first pole piece 23 may also be other, and the connection position of the second tab 22 on the second pole piece 24 may also be other.
  • first tab 21 is connected to the lower housing 10, and the lower housing 10 is electrically connected to the first conductive member 31, so the first tab 21 is electrically connected to the first conductive member 31, and the second conductive member 32 It is electrically connected with the second tab 22 .
  • the lower casing 10 may be a metal casing, and the cross-sectional shape of the lower casing 10 is not limited to a circle, but may also be an ellipse, a polygon, and the like.
  • the first conductive member 31 is a negative electrode conductive member
  • the second conductive member 32 is a positive electrode conductive member for illustration, but the present application is not limited thereto, and the first conductive member 31 is a positive electrode conductor, and the second conductor 32 is a negative electrode conductor.
  • the lower housing 10 includes a bottom wall 12 and a side wall 13 arranged around the edge of the bottom wall 12, so that the lower housing 10 forms a cover, and the side wall 13 and the bottom wall 12 of the lower housing 10
  • a second chamfering structure may also be provided at the connection of the two, and the angle range of the second chamfering structure may be 5°-90°.
  • the top end of the side wall 13 may be connected to the edge of the first conductive member 31 .
  • the edge portion of the first conductive member 31 may be connected to the top end portion of the side wall 13 by laser welding. In this way, actually the first conductive member 31 is connected to the opening of the lower case 10 to form the accommodating cavity 11 as a closed space.
  • a chamfer may also be provided at the connection between the first conductive member 31 and the lower case 10 , and the angle of the chamfer may be 5° ⁇ 90°.
  • the top end of the side wall 13 is connected to the positioning recess 312 , and the positioning recess 312 corresponds to the top end of the side wall 13 , so the positioning recess 312 is formed into a ring structure.
  • the depth of the positioning recess 312 may be 0.05 mm ⁇ 0.1 mm.
  • the positioning recess 312 extends to the edge side of the first conductive member 31, and a first chamfer structure is formed between the bottom wall and the side wall of the positioning recess 312, and the angle range of the first chamfer structure is: 5° ⁇ 90°.
  • the first conductive member 31 is provided with a through hole 311, and the second conductive member 32 is insulated and connected to the surface of the first conductive member 31 close to the accommodating cavity 11, so that at least part of the structure of the second conductive member 32 It is exposed to the outside of the accommodating cavity 11 through the through hole 311 .
  • the insulating connection here is, for example, a connection through insulating glue, or an insulating layer can be provided between the first conductive member 31 and the second conductive member 32, and the first conductive member 31 and the second conductive member 32 It can also be connected by soldering.
  • the lower case 10 and the first conductive member 31 form the first pole of the battery 100 , such as the negative pole; the sealing member 33 forms the second pole of the battery 100 , such as the positive pole. Because part of the structure of the second conductive member 32 is exposed to the outside of the battery 100 through the through hole 311, the sealing member 33 is formed on the part of the exposed area of the second conductive member 32, so that both the first pole and the second pole of the battery can be laid out on the top side of the battery 100 .
  • the sealing member 33 can be connected to the exposed area to cover the liquid injection port 323 .
  • the sealing member 33 should be disposed on the outer surface of the second conductive member 32 .
  • the sealing member 33 may be connected to the second conductive member 32 by laser welding or resistance welding. Or it can also be connected to the second conductive member 32 in other ways. It should be noted that the connection between the sealing member 33 and the second conductive member 32 is a sealed connection, so as to prevent the electrolyte solution from leaking there.
  • the sealing member 33 is welded on the second conductive member 32, in order to prevent the second conductive member 32 from being welded through, the position where the sealing member 33 is welded on the second conductive member 32 can be partially thickened .
  • the second conductive member 32 includes a first connecting portion 321 and a second connecting portion 322 arranged around the outer edge of the first connecting portion 321 , the thickness of the first connecting portion 321 is greater than that of the second connecting portion 322
  • the thickness of the first connecting portion 321 may be located in the through hole 311 .
  • the sealing member 33 may be connected to a side of the first connecting portion 321 away from the accommodating cavity 11 .
  • the thickness of the second connection part 322 may be 0.2mm-0.5mm, and the thickness of the first connection part 321 may be 0.1mm-0.3mm.
  • the thickness difference between the first connection part 321 and the second connection part 322 ranges from 0 mm to 0.4 mm.
  • the side wall of the second connecting portion 322 may have a distance from the inner side wall 13 of the through hole 311 on the first electrical connector, and an isolation layer 313 may be provided in this distance, so that the second connecting portion 322 is separated from the first electrical connector.
  • the conductive member 31 is electrically isolated. In other words, the isolation layer 313 is clamped between the sidewall of the first connecting portion 321 and the hole wall of the through hole 311 .
  • the second connecting portion 322 is insulated and connected to the first conductive member 31 , and the second connecting portion 322 may be located in the through hole 311 .
  • an insulating adhesive layer 314 is interposed between the first conductive member 31 and the second connecting portion 322 , and the second connecting portion 322 may be bonded to the first conductive member 31 through the insulating adhesive layer 314 .
  • the setting range of the insulating glue layer 314 should cover the overlapping range of the first conductive member 31 and the second connecting portion 322 , so as to achieve the effect of sealingly connecting the first conductive member 31 and the second conductive member 32 .
  • both the thickness of the isolation layer 313 and the thickness of the insulating adhesive layer 314 may range from 5 ⁇ m to 200 ⁇ m.
  • the isolation layer 313 can also be insulating glue, and in this case, the insulating glue layer 314 and the isolation layer 313 can be integrally formed.
  • the surface of the first connecting portion 321 facing into the accommodating cavity and the surface of the second connecting portion 322 facing into the accommodating cavity 11 are flush. That is, the inward surface of the first connecting portion 321 is flush with the inward surface of the second connecting portion 322 , and the thickness difference is reflected on the outward surfaces of the first connecting portion 321 and the second connecting portion 322 .
  • the top surface of the first connecting portion 321 is flush with the top surface of the first conductive member 31;
  • the height of the top surface of the first connecting part 321 relative to the bottom of the battery is higher than the height of the top surface of the first conductive member 31 relative to the bottom of the battery;
  • the height of the top surface of the first connecting portion 321 relative to the bottom of the battery is lower than the height of the top surface of the first conductive member 31 relative to the bottom of the battery.
  • the height difference between the top end surface of the first connecting portion 321 and the top end surface of the first conductive member 31 ranges from ⁇ 0.1 mm to 0.1 mm.
  • a liquid injection port 323 is formed on the second conductive member 32 , and the liquid injection port 323 can inject electrolyte solution into the lower casing 10 .
  • the liquid injection port 323 may be formed on the first connection part 321 .
  • FIG. 5 is a schematic diagram of the overall structure of another structure of the battery 100 provided in the embodiment of the present application.
  • the structure of the second conductive member is improved, and the rest of the structure in the battery is similar to that in FIG. 3 , which will not be repeated here.
  • the second conductive member 32 can also be formed as a flat plate as a whole, and the thickness of each part is approximately the same.
  • sealing member 33 The specific structure of the sealing member 33 will be described below with reference to FIG. 3 and FIG. 4 .
  • the sealing member 33 is welded on the first connecting portion 321 of the first conductive member 31 and exposed to the outside of the battery 100 through the through hole 311 .
  • the surface of the sealing member 33 near the outer side of the battery 100 may be configured as a boss structure.
  • the sealing member 33 includes a body portion 331 and a protruding portion 332 protruding from one side surface of the body portion 331 , and the protruding portion 332 is located on a side of the body portion 331 away from the accommodating cavity 11 .
  • the connection between the protruding portion 332 and the body portion 331 can be a rounded structure, the outer surface of the protruding portion 332 can be parallel to the thickness direction of the battery 100, and the outer surface of the protruding portion 332 can also be parallel to the thickness direction of the battery 100. It has a certain included angle, that is, inclined setting.
  • Both the body part 331 and the protruding part 332 can be formed as a truncated body of revolution, that is, the cross section is circular.
  • the diameter of the circular cross section can be 1.0 mm to 3.0 mm. mm, of course, the cross-sections of the body part 331 and the protruding part 332 can also be other shapes, which are not particularly limited in this application.
  • top surface of the protrusion 332 is flush with the top surface of the first conductive member 31;
  • the height of the top surface of the protrusion 332 relative to the bottom of the battery is higher than the height of the top surface of the first conductive member 31 relative to the bottom of the battery;
  • the height of the top surface of the protrusion 332 relative to the bottom of the battery is lower than the height of the top surface of the first conductive member 31 relative to the bottom of the battery.
  • the top surface of the body part 331 of the sealing part is flush with the top end surface of the first conductive part 31, and a side wall of the body part 331 of the sealing part and the side wall of the first conductive part 31 can be formed.
  • the insulating adhesive layer 314 is interposed between the first conductive member 31 and the second connecting portion 322
  • the insulating adhesive layer 314 can be extended to the side wall of the main body portion 331 of the sealing member and the first conductive member 31.
  • An isolation layer 313 is formed between the side walls, thereby expanding the bonding area between the sealing member 33 and the first conductive member 31 and the second conductive member 32 and the first conductive member 31, and improving the stability of the sealing member 33 and the second conductive member 32 .
  • the height difference between the top surface of the protruding portion 332 and the top surface of the first conductive member 31 is in the range of ⁇ 150 ⁇ m ⁇ 150 ⁇ m.
  • the thickness of the protruding portion 332 is 2-300 ⁇ m, and the thickness of the main body portion 331 is 0.05 mm-0.2 mm.
  • the thickness of the main body portion 331 of the sealing member 33 is smaller than or equal to the thickness of the second connecting portion 322 .
  • the thickness of the body portion 331 of the sealing member 33 is smaller than or equal to the thickness of the second conductive member 32 .
  • the thickness of the main body portion 331 of the sealing sheet may be 0 ⁇ 500 ⁇ m smaller than the thickness of the second connection portion 322 .
  • the liquid injection port 323 may be located at the center of the second conductive member 32 . On the one hand, it is convenient for processing, and on the other hand, it is also convenient for liquid injection.
  • the diameter of the liquid injection port 323 can be selected according to actual needs, which is not limited in this application.
  • FIG. 6 is a schematic structural view of the second conductive member 32 in the battery 100 provided by the embodiment of the present application.
  • the position of the outer contour edge of the second conductive member 32 is provided with a positioning mark 324, and the positioning mark 324 is used to indicate the second pole.
  • the welding position of the ear 22 on the second conductive member 32 may be a notch formed on the second conductive member 32, and the number of the notch may be at least one.
  • the number of positioning marks 324 is two, and the two positioning marks 324 may be arranged symmetrically with respect to the center of the second conductive member 32 .
  • the winding core 25 includes a first pole piece 23 and a second pole piece 24 .
  • the first pole piece 23 includes a first current collector and a first active material disposed on the opposite surface of the first current collector
  • the second pole piece 24 comprises a second current collector and a first active material disposed on the opposite surface of the second current collector.
  • the second active material may include at least one of lithium cobalt oxide, lithium manganese oxide, and lithium iron phosphate. More specifically, the particle size, compaction density, crystal structure, etc. are limited, and the selection can be intercalated and The positive electrode active material that deintercalates lithium As the second active material, lithium-containing compounds such as lithium oxide, lithium phosphorus oxide, lithium sulfide, or an interlayer compound containing lithium can be exemplified by lithium metal composite oxides.
  • the metal elements constituting the lithium metal composite oxide are, for example, selected from Mg, Al, Ca, Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Ga, Ge, Y, Zr, Sn , at least one of Sb, W, Pb and Bi. Further, at least one selected from Co, Ni, Mn, and Al may be contained.
  • suitable lithium metal composite oxides include lithium metal composite oxides containing Co, Ni, and Mn, and lithium metal composite oxides containing Co, Ni, and Al.
  • the first active material it only needs to be a material capable of absorbing and releasing lithium ions.
  • Examples thereof include carbon materials, lithium metal, metals capable of forming an alloy with lithium, or alloy compounds containing the metals.
  • the carbon material graphites such as natural graphite, non-graphitizable carbon, and artificial graphite, and cokes can be used.
  • the alloy compound at least one metal that can form an alloy with lithium can be used.
  • silicon and tin can be selected, and silicon oxide, tin oxide, or the like bonded to oxygen can also be used.
  • a mixture of the above-mentioned carbon material and a compound of silicon or tin can be used.
  • one having a higher charging and discharging potential with respect to metal lithium such as lithium titanate than carbon materials and the like may be used.
  • a non-aqueous electrolyte including a non-aqueous solvent and an electrolyte salt dissolved in the non-aqueous solvent may be selected.
  • the nonaqueous electrolyte is not limited to a liquid electrolyte (nonaqueous electrolytic solution), and may be a solid electrolyte using a gel polymer or the like.
  • the electrolyte solution can be a mixed organic solvent selected from at least one of the following: propylene carbonate (PC), ethylene carbonate (EC), diethyl carbonate (DEC), dimethyl carbonate (DMC), carbonic acid Dipropyl ester (DPC), dimethyl sulfoxide, acetonitrile, dimethoxyethane, diethoxyethane, tetrahydrofuran, N-methyl-2-pyrrolidone (NMP), ethyl methyl carbonate (EMC) , ⁇ -butyrolactone (GBL), fluoroethylene carbonate (FEC), methyl formate, ethyl formate, propyl formate, methyl acetate, ethyl acetate, propyl acetate, amyl acetate, propionic acid Methyl propionate, ethyl propionate and butyl propionate.
  • PC propylene carbonate
  • EC ethylene carbonate
  • DEC
  • the electrolytic solution according to the present disclosure may also contain a lithium salt, and the anion of the lithium salt may be at least one selected from the following: F-, Cl-, Br-, I-, NO 3 -, N( CN) 2 -, BF 4 -, ClO 4 -, PF 6 -, (CF 3 ) 2 PF 4 -, (CF 3 ) 3 PF 3 -, (CF 3 ) 4 PF 2 -, (CF 3 ) 5 PF -, (CF 3 ) 6 P-, F 3 SO 3 -, CF 3 CF 2 SO 3 -, (CF 3 SO 2 ) 2 N-, (FSO 2 ) 2 N-, CF 3 CF 2 (CF 3 ) 2 CO-, (CF 3 SO 2 ) 2 CH-, (SF 5 ) 3 C-, (CF 3 SO 2 ) 3 C-, CF 3 (CF 2 ) 7 SO 3 -, CF 3 CO 2 -, CH 3 CO 2 -, SCN-
  • Step 1 First, bend the first tab 21, and connect one end of the first tab 21 to the corresponding pole piece of the winding core 25. It should be noted that after the first tab 21 is bent, the other end should be kept in line with the coil.
  • the end faces of the core 25 are parallel;
  • Step 2 Place the winding core 25 connected with the first tab 21 and the second tab 22 inside the accommodating cavity 11, and weld the first tab 21 and the lower casing 10 by laser welding or resistance welding,
  • the second tab 22 is welded to the second conductive member 32 by laser welding or resistance welding.
  • Step 3 Apply insulating glue between the second conductive member 32 and the first conductive member 31, bond the two together, and weld the first conductive member 31 to the lower housing 10 by laser welding or resistance welding, and then Put in the oven to bake.
  • Step 4 inject the electrolyte solution into the lower case 10 through the liquid injection port 323 .
  • the sealing member 33 is welded on the second conductive member 32 by laser welding or resistance welding to complete the assembly of the battery 100 .
  • Step 5 Carry out an electrical performance test on the above-mentioned battery 100 .
  • the second conductive member 32 is connected to the side of the first conductive member 31 close to the accommodating cavity 11, in other words, the second conductive member 32 is connected to the inner surface of the first conductive member 31, and the second conductive member 32 At least part of the structure of the conductive member 32 is exposed to the outside of the battery 100 through the through hole 311 on the first conductive member 31.
  • the second conductive member 32 bears a large force toward the battery.
  • the present disclosure also provides an electronic device, including: an electronic device body and the aforementioned battery 100 , and the battery 100 provides electric energy for the electronic device body.
  • the structure of the battery in the electronic device provided by the present disclosure is the same as that of the above-mentioned battery, and can bring about the same or similar technical effects, which will not be repeated here.
  • connection should be interpreted in a broad sense, for example, it can be fixedly connected, or through an intermediate
  • the media is indirectly connected, which can be the internal communication of two elements or the interaction relationship between two elements.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Connection Of Batteries Or Terminals (AREA)

Abstract

本公开提供一种电池及电子设备，电池包括：下壳体，下壳体内具有容置腔；电极组件，电极组件位于容置腔内；以及盖板组件，盖板组件设于下壳体上，盖板组件包括：第一导电件，第一导电件连接于下壳体顶端，且第一导电件上设有贯穿孔；第二导电件，第二导电件绝缘连接于第一导电件的靠近容置腔的表面上，第二导电件的至少部分结构自贯穿孔暴露出，第二导电件自贯穿孔暴露出的部分设有注液口；以及位于第二导电件上的封口件，封口件封盖注液口。本公开的电池可靠性较高。

Description

电池及电子设备
本申请要求于2021年9月18日提交中国专利局、申请号为202111112948.2、申请名称为“电池及电子设备”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
本公开涉及电池技术领域，尤其涉及一种电池及电子设备。
背景技术
随着经济的发展和科技的进步，智能产品越来越向轻便化、小型化的方向发展，可重复循环充电使用的电池也逐步应用到了人们日常生活的各个领域。
现有的电池包括下壳体、正极导电件、负极导电件、电极组件和封口件，其中，电极组件位于下壳体内，负极导电件盖设在下壳体的顶端，负极导电件中部设有通孔；正极导电件通过绝缘胶粘贴在负极导电件的外侧面上，并且正极导电件的中部通过负极导电件上的通孔与下壳体内部连通。正极导电件上设有注液口，封口件就焊接在正极导电件上，以封盖注液口。
然而，上述现有的电池在抗内部压强方面较弱，电池使用过程中容易出现正极导电件被顶开的情况，导致电池可靠性较差。
申请内容
鉴于上述问题，本申请实施例提供一种电池及电子设备，可靠性较高。
为了实现上述目的，本申请第一方面提供一种电池，包括：下壳体，下壳体内具有容置腔；电极组件，电极组件位于容置腔内；以及盖板组件，盖板组件设于所述下壳体上，盖板组件包括：第一导电件，第一导电件连接于下壳体顶端，且第一导电件上设有贯穿孔；第二导电件，第二导电件绝缘连接于第一导电件的靠近容置腔的表面上，第二导电件的至少部分结构自贯穿孔暴露出，第二导电件自贯穿孔暴露出的部分设有注液口；以及位于第 二导电件上的封口件，封口件封盖注液口。
在一种可能的实施方式中，第二导电件包括第一连接部，以及围绕在第一连接部外边缘设置的第二连接部，第一连接部的厚度大于第二连接部的厚度；第一连接部绝缘连接在第一导电件上，第二连接部接部位于贯穿孔中，封口件连接在第一连接部的背离容置腔的一面上。
在一种可能的实施方式中，第一连接部的朝向容置腔内的表面以及第二连接部的朝向容置腔内的表面齐平；第一连接部的厚度范围为：0.2mm～0.5mm；和/或
第二连接部的厚度范围为：0.1mm～0.3mm。
在一种可能的实施方式中，贯穿孔和第一连接部之间还设有隔离层，隔离层被夹持在第一连接部的侧壁和贯穿孔的孔壁之间。
在一种可能的实施方式中，第一导电件和第二连接部之间夹设有绝缘胶层。
在一种可能的实施方式中，隔离层和绝缘胶层的厚度范围均为：5μm～200μm。
在一种可能的实施方式中，第一连接部的顶端面与第一导电件的顶端面齐平；或者
第一连接部的顶端面相对于电池底部的设置高度高于第一导电件的顶端面相对于电池底部的设置高度；或者
第一连接部的顶端面相对于电池底部的设置高度低于第一导电件的顶端面相对于电池底部的设置高度。
在一种可能的实施方式中，第一连接部的顶端面与第一导电件的顶端面的高度差范围为：-0.1mm～0.1mm。
在一种可能的实施方式中，封口件包括本体部以及凸设在本体部上的凸出部，凸出部位于本体部的背离容置腔的一侧。
在一种可能的实施方式中，凸出部的顶端面与第一导电件的顶端面齐平；或者
凸出部的顶端面相对于电池底部的设置高度高于第一导电件的顶端面相对于电池底部的设置高度；或者
凸出部的顶端面相对于电池底部的设置高度低于第一导电件的顶端面相对于电池底部的设置高度。
在一种可能的实施方式中，凸出部的顶端面与第一导电件的顶端面的高度差范围为：-150μm～150μm。
在一种可能的实施方式中，本体部的厚度与第二连接部的厚度差为：0～500μm。
在一种可能的实施方式中，本体部的厚度范围为0.05mm～0.2mm。
在一种可能的实施方式中，凸出部为圆台状，凸出部的横截面直径范围为：1.0mm～3.0mm；和/或
本体部为圆台状。
在一种可能的实施方式中，注液口位于第二导电件的中心位置。
在一种可能的实施方式中，下壳体包括底壁和围绕并连接在底壁边缘的侧壁，侧壁的顶部和第一导电件的边缘部分连接。
在一种可能的实施方式中，第一导电件的靠边缘位置具有定位凹陷，定位凹陷位于第一导电件的朝向电极组件的表面上，侧壁的顶端与定位凹陷连接。
在一种可能的实施方式中，定位凹陷的深度为：0.05mm～0.1mm。
在一种可能的实施方式中，定位凹陷延伸至第一导电件的边缘侧面，定位凹陷的底壁和侧壁之间形成第一倒角结构，第一倒角结构的角度范围为：5°～90°。
在一种可能的实施方式中，下壳体的侧壁和下壳体的底壁的连接位置处设置第二倒角结构，第二倒角结构的倒角范围为：5°～90°。
在一种可能的实施方式中，电极组件包括第一极耳和第二极耳，第一极耳和第一导电件电连接，第二极耳和第二导电件电连接，
第二导电件的外轮廓边缘位置设有定位标记，定位标记用于指示第二极耳在第二导电件上的焊接位置。
在一种可能的实施方式中，定位标记的数量为两个，且两个定位标记相对于第二导电件的中心对称设置。
在一种可能的实施方式中，电极组件包括第一极耳、第二极耳、以及第一极片、第二极片和隔膜，
第一极片、隔膜、第二极片依次层叠并卷绕，第一极耳电连接在第一极片上，第二极耳电连接在第二极片上，
第一极片的卷绕首端和卷绕尾端均具有空箔区，第二极片的卷绕首端 和卷绕尾端均具有空箔区，
第一极耳电连接在第一极片的卷绕尾端的空箔区上，第二极耳电连接在第二极片的卷绕尾端的空箔区上。
本申请第二方面提供一种电子设备，包括：电子设备本体和上述的电池，电池为电子设备本体提供电能。
本申请的电池及电子设备，该实施例的电池由于第二导电件连接在第一导电件的靠容置腔的一面上，换言之，第二导电件连接于第一导电件的内侧表面上，并且第二导电件的至少部分结构通过第一导电件上的贯穿孔暴露至电池外，在电池使用过程中，若遇到内部压力较大，第二导电件承受较大的朝向电池外侧的压力，第二导电件与第一导电件对应的部分被与下壳体连接固定的第一导电件所阻挡，从而阻挡第二导电件由于内部压力过大而被冲开，由第一导电件整体抵消一部分，分担了第二导电件受到的压力，有效改善了现有技术中第二导电件被顶起的状况。
本公开的构造以及它的其他公开目的及有益效果将会通过结合附图而对优选实施例的描述而更加明显易懂。
附图说明
图1为本申请实施例提供的一种电池的整体结构示意图；
图2为本申请实施例提供的一种电池的俯视图；
图3为沿图2的A-A线的剖视图；
图4为图3的B处的局部放大图；
图5为本申请实施例提供的电池的另一种结构的整体结构示意图；
图6为本申请实施例提供的电池中第二导电件的结构示意图。
附图标记说明：
100-电池；10-下壳体；11-容置腔；12-底壁；13-侧壁；20-电极组件；21-第一极耳；22-第二极耳；23-第一极片；24-第二极片；25-卷芯；26-隔离膜；30-盖板组件；31-第一导电件；311-贯穿孔；312-定位凹陷；313-隔离层；314-绝缘胶层；32-第二导电件；321-第一连接部；322-第二连接部；323-注液口；324-定位标记；33-封口件；331-本体部；332-凸出部。
具体实施方式
为使本公开的目的、技术方案和优点更加清楚，下面将结合本公开实施例中的附图，对本公开实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例是本公开一部分实施例，而不是全部的实施例。基于本公开中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本公开保护的范围。
现有的电池存在可靠性差的问题。这是由于，现有的电池中，正极导电件连接在电池的最外侧，当电池内部压力过大时，该压力就会直接将正极导电件顶开。
而本申请的电池中，将正极导电件连接在负极导电件的内侧，位于电池内侧的正极导电件在受到的压力较大时，会抵靠在负极导电件上，由负极导电件分担一部分压力，从而减缓了正极导电件受到的压力，避免正极导电件被直接顶开，由此提高电池的可靠性。
下面结合附图说明本申请实施例的电池，需要注意的是，本申请以电池为扣式电池为例进行说明。扣式电池是指外形尺寸像纽扣的电池，一般其直径较大，厚度尺寸较薄，因此扣式电池是从外形上来对电池进行的分类。
但本申请不限于此，也可以是其它类型的电池，当电池为其它类型的电池时，其抗压的原理与此类似，此处不再赘述。
图1为本申请实施例提供的一种电池的整体结构示意图，图2为本申请实施例提供的一种电池的俯视图，图3为沿图2的A-A线的剖视图，图4为图3的B处的局部放大图。
参照图1、图2、图3、图4，本申请实施例提供一种电池100，该电池100包括：下壳体10、盖板组件30以及电极组件20。
其中，下壳体10内部形成有容置腔11，盖板组件30可以盖设在下壳体10的顶部，电极组件20就设置在容置腔11内。
盖板组件30可以包括第一导电件31、第二导电件32以及封口件33。其中，第一导电件31连接于下壳体10顶端，且第一导电件31上设有贯穿孔311；第二导电件32绝缘连接于第一导电件31的靠近容置腔11的表面上，第二导电件32的至少部分结构自贯穿孔311暴露出，第二导电件32自贯穿孔暴露出的部分设有注液口323，封口件33位于第二导电件32上，并封盖注液口323。
在上述方案中，由于第二导电件32连接在第一导电件31的靠容置腔11的一面上，换言之，第二导电件32连接于第一导电件31的内侧表面上，并且第二导电件32的至少部分结构通过第一导电件31上的贯穿孔311暴露至电池100外，在电池100使用过程中，若遇到内部压力较大，第二导电件32承受较大的朝向电池100外侧的压力，第二导电件32与第一导电件31对应的部分被与下壳体10连接固定的第一导电件31所阻挡，从而阻挡第二导电件32由于内部压力过大而被冲开，由第一导电件31整体抵消一部分，分担了第二导电件32受到的压力，有效改善了现有技术中第二导电件32被顶起的状况。
本申请实施例中，电极组件20可以包括卷芯25、第一极耳21和第二极耳22，卷芯25包括第一极片23、第二极片24、以及隔离膜26等。具体的，卷芯25可以为圆柱形卷绕体且设于容置腔11内，容置腔11内也同时容纳有电解液，第一极片23与第二极片24由隔离膜26隔开并卷绕在一起。
第一极片23上电连接有第一极耳21，第二极片24上电连接有第二极耳22，第一极耳21和第二极耳22可以分别在卷芯25的两端侧引出。具体的，第一极片23的卷绕首端和卷绕尾端均具有空箔区，第二极片24的卷绕首端和卷绕尾端均具有空箔区，第一极耳21电连接在第一极片23的卷绕尾端的空箔区上，第二极耳22电连接在第二极片24的卷绕尾端的空箔区上。
当然，本申请不限于此，第一极耳21在第一极片23上的连接位置也可以是其它，第二极耳22在第二极片24上的连接位置也可以为其它。
另外，第一极耳21连接在下壳体10上，而下壳体10又与第一导电件31电连接，因此第一极耳21与第一导电件31电连接，并且第二导电件32与第二极耳22电连接。
本申请实施例中，下壳体10可以为金属壳体，下壳体10的截面形状不限于圆形，还可以为椭圆形、多边形等。
需要注意的是，本申请实施例中，以第一导电件31是负极导电件，第二导电件32是正极导电件为例进行说明，但本申请不限于此，也可以是第一导电件31是正极导电件，第二导电件32是负极导电件。
示例性的，参照图3，下壳体10包括底壁12和围绕底壁12边缘设置的侧壁13，使得下壳体10形成罩状件，下壳体10的侧壁13和底壁12的连接处还可以设有第二倒角结构，第二倒角结构的角度范围可以是5°～90°。
参照图3、图4，侧壁13的顶端部可以和第一导电件31的边缘部分连接。例如，第一导电件31的边缘部分可以通过激光焊接而连接在侧壁13的顶端部。这样，实际上第一导电件31连接在下壳体10的开口部上，以将容置腔11形成为闭合的空间。另外，第一导电件31与下壳体10的连接处也可以设置倒角，倒角的角度可以为5°～90°。
当然，为了便于第一导电件31和侧壁13焊接，可以考虑对第一导电件31的边缘做减薄设计，例如，第一导电件31的靠边缘位置具有定位凹陷312，定位凹陷312位于第一导电件31的朝向电极组件的表面上，侧壁13的顶端与定位凹陷312连接，定位凹陷312与侧壁13的顶端部对应，因而定位凹陷312形成为环状结构。示例性的，定位凹陷312的深度可以是0.05mm～0.1mm。
本申请实施例中，定位凹陷312延伸至第一导电件31的边缘侧面，定位凹陷312的底壁和侧壁之间形成第一倒角结构，第一倒角结构的角度范围为：5°～90°。
本申请实施中，第一导电件31上设有贯穿孔311，第二导电件32绝缘连接于第一导电件31的靠容置腔11的表面上，这样第二导电件32的至少部分结构通过贯穿孔311露出至容置腔11外部。可以理解的是，这里的绝缘连接，例如是可以通过绝缘胶的连接，或者可以在第一导电件31和第二导电件32之间设置绝缘层，第一导电件31和第二导电件32也可以通过焊接连接。
参照图1，从电池100整个外部来看，下壳体10和第一导电件31形成电池100的第一极，例如负极；封口件33形成电池100的第二极，例如正极。正由于第二导电件32的部分结构通过贯穿孔311露出至电池100外部，封口件33形成在第二导电件32的该部分露出区域上，因此电池的第一极和第二极都可以布局在电池100的顶侧。
参照图3、图4，为了便于对电池100内注入电解液，可以考虑在第二导电件32上设置注液口323，示例性的，第二导电件32自贯穿孔暴露出的部分设有注液口323，封口件33可以连接在露出区域上以封盖注液口323。当然，为了便于安装，封口件33要设置在第二导电件32的外侧表面上。
这里，封口件33可以通过激光焊接或者电阻焊接而连接在第二导电件32上。或者也可以通过其它方式而连接在第二导电件32上。需要注意的是，封口件33与第二导电件32的连接是密封连接，以防止电解液从该处露出。
下面说明第二导电件32、封口件33与第一导电件31的具体结构以及连 接方式。
参照图3，如前所述，封口件33焊接在第二导电件32上，为了防止将第二导电件32焊穿，可以将第二导电件32上与封口件33焊接的位置局部加厚。
参照图4，示例性的，第二导电件32包括第一连接部321、以及围绕第一连接部321外边缘设置的第二连接部322，第一连接部321的厚度大于第二连接部322的厚度，第一连接部321可以位于贯穿孔311中。封口件33可以连接在第一连接部321的背离容置腔11的一面上。例如，第二连接部322的厚度可以为0.2mm～0.5mm，第一连接部321的厚度可以为0.1mm～0.3mm。第一连接部321和第二连接部322之间的厚度差范围为0mm～0.4mm。
此时第二连接部322的侧壁可与第一电连接件上的贯穿孔311的内侧壁13具有间距，在该间距中可以设有隔离层313，以使第二连接部322与第一导电件31电气隔离。换言之，隔离层313被夹持在第一连接部321的侧壁和贯穿孔311的孔壁之间。
另外，第二连接部322绝缘连接在第一导电件31上，并且第二连接部322接部可以位于贯穿孔311中。示例性的，第一导电件31和第二连接部322之间夹设有绝缘胶层314，第二连接部322可以通过绝缘胶层314而粘接在第一导电件31上。当然，绝缘胶层314的设置范围要覆盖第一导电件31和第二连接部322的重叠范围，以达到密封连接第一导电件31和第二导电件32的效果。
示例性的，隔离层313的厚度和绝缘胶层314的厚度范围都可以是5μm～200μm。隔离层313也可以是绝缘胶，此时绝缘胶层314和隔离层313可以一体形成。
在一种可能的实施方式中，第一连接部321的朝向容置腔内的表面以及第二连接部322的朝向容置腔11内的表面齐平。即第一连接部321朝内的表面与第二连接部322朝内的表面齐平，厚度差体现在第一连接部321和第二连接部322朝外侧的表面上。
示例性的，第一连接部321的顶端面与第一导电件31的顶端面齐平；或者
第一连接部321的顶端面相对于电池底部的设置高度高于第一导电件31的顶端面相对于电池底部的设置高度；或者
第一连接部321的顶端面相对于电池底部的设置高度低于第一导电件31 的顶端面相对于电池底部的设置高度。
例如，第一连接部321的顶端面与第一导电件31的顶端面的高度差范围为：-0.1mm～0.1mm。
本申请实施例中，在第二导电件32上形成有注液口323，注液口323可以供电解液注入下壳体10内。这里注液口323可以形成在第一连接部321上。
图5为本申请实施例提供的电池100的另一种结构的整体结构示意图。
参照图5，作为另一种可能的实施方式，在上述方案的基础上，对第二导电件的结构进行改进，电池中其余结构与图3中的类似，此处不再赘述。使第二导电件32也可以整体设为平板状结构，各部分的厚度尺寸大致相同。
下面参照图3和图4介绍封口件33的具体结构。
如前所述，封口件33焊接在第一导电件31的第一连接部321上，并通过贯穿孔311露出在电池100外部。
本申请实施例中，为了便于封口件33与外部的零部件、例如导线或者导电片连接，可以使封口件33靠电池100外侧的表面设置为凸台结构。
示例性的，封口件33包括本体部331以及凸设在本体部331一侧表面上的凸出部332，凸出部332位于本体部331的背离容置腔11的一侧。凸出部332与本体部331的连接处可以是倒圆角的结构，凸出部332的外侧面可以与电池100的厚度方向平行，凸出部332的外侧面也可以与电池100的厚度方向具有一定的夹角，即倾斜设置。
本体部331和凸出部332均可以形成为圆台状等回转体，即横截面为圆形，凸出部332的横截面为圆形时，该圆形横截面的直径可以为1.0mm～3.0mm，当然本体部331和凸出部332的横截面也可以为其它形状，本申请对此不作特别限定。
需要注意的是，凸出部332的顶端面与第一导电件31的顶端面齐平；或者
凸出部332的顶端面相对于电池底部的设置高度高于第一导电件31的顶端面相对于电池底部的设置高度；或者
凸出部332的顶端面相对于电池底部的设置高度低于第一导电件31的顶端面相对于电池底部的设置高度。
在一个具体示例中，封口件的本体部331的顶面与第一导电件31的顶端面齐平，且封口件的本体部331的侧壁与第一导电件31的侧壁之间可形成有 隔离层313，从而有效固定封口件33，防止封口件33受到较大的内部压力而被顶开。在第一导电件31和第二连接部322之间夹设有绝缘胶层314的示例中，可通过将绝缘胶层314延长至封口件的本体部331的侧壁与第一导电件31的侧壁之间形成隔离层313，从而扩大封口件33与第一导电件31以及第二导电件32与第一导电件31的粘结面积，提高封口件33和第二导电件32的稳定性。
示例性的，凸出部332的顶端面与第一导电件31的顶端面的高度差范围为：-150μm～150μm。
参照图4，示例性的，凸出部332的厚度为2～300μm，本体部331的厚度为0.05mm～0.2mm。
另外，封口件33的本体部331的厚度小于或者等于第二连接部322的厚度。换言之，封口件33的本体部331的厚度要小于或等于第二导电件32的厚度。例如，封口片的本体部331的厚度可以比第二连接部322的厚度小0～500μm。
本申请实施例中，参照图3，注液口323可以位于第二导电件32的中心位置。一方面便于加工，另一方面也便于注液。注液口323的直径尺寸可以根据实际需要选择，本申请对此不作限定。
图6为本申请实施例提供的电池100中第二导电件32的结构示意图，参照图6，第二导电件32的外轮廓边缘位置设有定位标记324，定位标记324用于指示第二极耳22在第二导电件32上的焊接位置。这里定位标记324可以是形成在第二导电件32上的缺口，缺口的数量可以为至少一个。
示例性的，定位标记324的数量为两个，且两个定位标记324可以相对于第二导电件32的中心对称设置。
本申请实施例中，如前所述，卷芯25包括第一极片23和第二极片24。其中，第一极片23包括第一集流体以及设置在第一集流体相对表面上的第一活性材料，第二极片24包括第二集流体以及设置在第二集流体相对表面上的第二活性材料。
示例性的，第二活性材料可以包括钴酸锂、锰酸锂、磷酸铁锂中的至少一种，更具体地，对粒径、压实密度、晶型结构等进行限定，选择能够嵌入和脱嵌锂的正极活性物质作为第二活性材料，例如锂氧化物、锂磷氧化物、锂硫化物或包含锂的层间化合物等含锂化合物，可以示例出锂金属复合氧化 物。其中，构成锂金属复合氧化物的金属元素例如为选自Mg、Al、Ca、Sc、Ti、V、Cr、Mn、Fe、Co、Ni、Cu、Zn、Ga、Ge、Y、Zr、Sn、Sb、W、Pb和Bi中的至少一种。进一步，可以包含选自Co、Ni、Mn和Al中的至少一种。作为较为合适的锂金属复合氧化物的一个例子，可列举出含有Co、Ni和Mn的锂金属复合氧化物、含有Co、Ni和Al的锂金属复合氧化物。
而对于第一活性材料，只要满足能够吸藏、释放锂离子的材料即可。例如可列举出碳材料、锂金属、能与锂形成合金的金属或包含该金属的合金化合物等。作为碳材料，可以使用天然石墨、难石墨化性碳、人造石墨等石墨类、焦炭类等，作为合金化合物，可列举出包含至少一种能与锂形成合金的金属。作为能与锂形成合金的元素，可以选择硅、锡，也可以使用这些与氧结合而成的氧化硅、氧化锡等。另外，可以使用将上述碳材料与硅、锡的化合物混合而成者。除了上述之外，还可以使用相对于钛酸锂等金属锂的充放电的电位高于碳材料等者。
而对于电解液，可以选择非水电解质，非水电解质包含非水溶剂和溶解于非水溶剂中的电解质盐。非水电解质不限定于液体电解质(非水电解液)，还可以是使用了凝胶状聚合物等的固体电解质。
电解液可以是选自如下中的至少一种的混合有机溶剂：碳酸亚丙酯(PC)、碳酸亚乙酯(EC)、碳酸二乙酯(DEC)、碳酸二甲酯(DMC)、碳酸二丙酯(DPC)、二甲基亚砜、乙腈、二甲氧基乙烷、二乙氧基乙烷、四氢呋喃、N-甲基-2-吡咯烷酮(NMP)、碳酸乙甲酯(EMC)、γ-丁内酯(GBL)、氟代碳酸亚乙酯(FEC)、甲酸甲酯、甲酸乙酯、甲酸丙酯、乙酸甲酯、乙酸乙酯、乙酸丙酯、乙酸戊酯、丙酸甲酯、丙酸乙酯和丙酸丁酯。此外，根据本公开的电解液还可以包含锂盐，并且所述锂盐的阴离子可以是选自如下中的至少一种：F-、Cl-、Br-、I-、NO 3-、N(CN) 2-、BF 4-、ClO 4-、PF 6-、(CF 3) 2PF 4-、(CF 3) 3PF 3-、(CF 3) 4PF 2-、(CF 3) 5PF-、(CF 3) 6P-、F 3SO 3-、CF 3CF 2SO 3-、(CF 3SO 2) 2N-、(FSO 2) 2N-、CF 3CF 2(CF 3) 2CO-、(CF 3SO 2) 2CH-、(SF 5) 3C-、(CF 3SO 2) 3C-、CF 3(CF 2) 7SO 3-、CF 3CO 2-、CH 3CO 2-、SCN-和(CF 3CF 2SO 2) 2N-。
下面说明本申请的电池100的装配过程：
步骤一：首先将第一极耳21弯折，将第一极耳21的一端连接在卷芯25的对应极片上，需要注意的是，第一极耳21弯折后另一端要保持与卷芯25 的端面平行；
将第二极耳22弯折，将第二极耳22的一端连接在卷芯25的对应极片上，需要注意的是，第二极耳22弯折后另一端要保持与卷芯25的端面平行；
步骤二：将连接好第一极耳21和第二极耳22的卷芯25放置于容置腔11内部，并通过激光焊接或电阻焊接，将第一极耳21与下壳体10焊接，通过激光焊接或电阻焊接，将第二极耳22与第二导电件32焊接。
步骤三：将第二导电件32与第一导电件31之间涂覆绝缘胶，将二者粘合起来，并通过激光焊接或者电阻焊接将第一导电件31焊接在下壳体10上，然后放入烤箱烘烤。
步骤四：通过注液口323将电解液注入下壳体10内部。并通过激光焊接或者电阻焊接将封口件33焊接在第二导电件32上，完成电池100的装配。
步骤五：对上述电池100进行电性能测试。
本实施例中，由于第二导电件32连接在第一导电件31的靠容置腔11的一面上，换言之，第二导电件32连接于第一导电件31的内侧表面上，并且第二导电件32的至少部分结构通过第一导电件31上的贯穿孔311暴露至电池100外，在电池100使用过程中，若遇到内部压力较大，第二导电件32承受较大的朝向电池100外侧的压力时，第二导电件32上位于第一导电件31内侧的部分会被第一导电件31遮挡，该压力从第二导电件32传导至第一导电件31，由第一导电件31整体抵消一部分，分担了第二导电件32受到的压力，从而有效改善了现有技术中电池100顶盖容易被顶起的状况。
本公开还提供一种电子设备，包括：电子设备本体和上述的电池100，电池100为电子设备本体提供电能。
其中，本公开提供的电子设备中的电池的结构与以上所述的电池的结构相同，并能带来相同或者类似的技术效果，在此不再一一赘述。
在本公开的描述中，需要说明的是，除非另有明确的规定和限定，术语“安装”、“相连”、“连接”应作广义理解，例如，可以使固定连接，也可以是通过中间媒介间接相连，可以是两个元件内部的连通或者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公开中的具体含义。
在本公开的描述中，需要理解的是，术语“上”、“下”、“前”、“后”、“竖直”、“水平”、“顶”、“底”、“内”、“外”等指示的方位或 者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公开和简化描述，而不是指示或者暗示所指的装置或者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公开的限制。
本申请的说明书和权利要求书及上述附图中的术语“第一”、“第二”、“第三”、“第四”等(如果存在)是用于区别类似的对象，而不必用于描述特定的顺序或先后次序。应该理解这样使用的数据在适当情况下可以互换，以便这里描述的本申请的实施例例如能够以除了在这里图示或描述的那些以外的顺序实施。
此外，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。
最后应说明的是：以上各实施例仅用以说明本公开的技术方案，而非对其限制；尽管参照前述各实施例对本公开进行了详细的说明，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公开各实施例技术方案的范围。

Claims (24)

  1. 一种电池，其特征在于，包括：
    下壳体，所述下壳体内具有容置腔；
    电极组件，所述电极组件位于所述容置腔内；以及
    盖板组件，所述盖板组件设于所述下壳体上，所述盖板组件包括：
    第一导电件，所述第一导电件连接于所述下壳体顶端，且所述第一导电件上设有贯穿孔；
    第二导电件，所述第二导电件绝缘连接于所述第一导电件的靠近所述容置腔的表面上，所述第二导电件的至少部分结构自所述贯穿孔暴露出，所述第二导电件自所述贯穿孔暴露出的部分设有注液口；以及
    位于所述第二导电件上的封口件，所述封口件封盖所述注液口。
  2. 根据权利要求1所述的电池，其特征在于，所述第二导电件包括第一连接部，以及围绕所述第一连接部外边缘设置的第二连接部，所述第一连接部的厚度大于所述第二连接部的厚度；所述第二连接部绝缘连接在所述第一导电件上，所述第一连接部接部位于所述贯穿孔中，所述封口件连接在所述第一连接部的背离所述容置腔的一面上。
  3. 根据权利要求2所述的电池，其特征在于，所述第一连接部的朝向所述容置腔内的表面以及所述第二连接部的朝向所述容置腔内的表面齐平；
    所述第一连接部的厚度范围为：0.2mm～0.5mm；和/或
    所述第二连接部的厚度范围为：0.1mm～0.3mm。
  4. 根据权利要求2所述的电池，其特征在于，所述贯穿孔和所述第一连接部之间还设有隔离层，所述隔离层被夹持在所述第一连接部的侧壁和所述贯穿孔的孔壁之间。
  5. 根据权利要求4所述的电池，其特征在于，所述第一导电件和所述第二连接部之间夹设有绝缘胶层。
  6. 根据权利要求5所述的电池，其特征在于，所述隔离层和所述绝缘胶层的厚度范围均为：5μm～200μm。
  7. 根据权利要求2所述的电池，其特征在于，所述第一连接部的顶端面与所述第一导电件的顶端面齐平；或者
    所述第一连接部的顶端面相对于所述电池底部的设置高度高于所述第一 导电件的顶端面相对于所述电池底部的设置高度；或者
    所述第一连接部的顶端面相对于所述电池底部的设置高度低于所述第一导电件的顶端面相对于所述电池底部的设置高度。
  8. 根据权利要求7所述的电池，其特征在于，所述第一连接部的顶端面与所述第一导电件的顶端面的高度差范围为：-0.1mm～0.1mm。
  9. 根据权利要求2所述的电池，其特征在于，所述封口件包括本体部以及凸设在所述本体部上的凸出部，所述凸出部位于所述本体部的背离所述容置腔的一侧。
  10. 根据权利要求9所述的电池，其特征在于，所述凸出部的顶端面与所述第一导电件的顶端面齐平；或者
    所述凸出部的顶端面相对于所述电池底部的设置高度高于所述第一导电件的顶端面相对于所述电池底部的设置高度；或者
    所述凸出部的顶端面相对于所述电池底部的设置高度低于所述第一导电件的顶端面相对于所述电池底部的设置高度。
  11. 根据权利要求10所述的电池，其特征在于，所述凸出部的顶端面与所述第一导电件的顶端面的高度差范围为：-150μm～150μm。
  12. 根据权利要求10所述的电池，其特征在于，所述本体部的厚度比所述第二连接部的厚度小0～500μm。
  13. 根据权利要求9所述的电池，其特征在于，所述本体部的厚度范围为0.05mm～0.2mm。
  14. 根据权利要求9所述的电池，其特征在于，所述凸出部为圆台状，所述凸出部的横截面直径范围为：1.0mm～3.0mm；和/或
    所述本体部为圆台状。
  15. 根据权利要求1-14任一项所述的电池，其特征在于，所述注液口位于所述第二导电件的中心位置。
  16. 根据权利要求1-14任一项所述的电池，其特征在于，所述下壳体包括底壁和围绕并连接在所述底壁边缘的侧壁，所述侧壁的顶部和所述第一导电件的边缘部分连接。
  17. 根据权利要求16所述的电池，其特征在于，所述第一导电件的靠近边缘位置具有定位凹陷，所述定位凹陷位于所述第一导电件的朝向所述电极组件的表面上，所述侧壁的顶端与所述定位凹陷连接。
  18. 根据权利要求17所述的电池，其特征在于，所述定位凹陷的深度为：0.05mm～0.1mm。
  19. 根据权利要求17所述的电池，其特征在于，所述定位凹陷延伸至所述第一导电件的边缘侧面，所述定位凹陷的底壁和侧壁之间形成第一倒角结构，所述第一倒角结构的角度范围为：5°～90°。
  20. 根据权利要求16所述的电池，其特征在于，所述下壳体的侧壁和所述下壳体的底壁的连接位置处设置第二倒角结构，所述第二倒角结构的倒角范围为：5°～90°。
  21. 根据权利要求1-14任一项所述的电池，其特征在于，所述电极组件包括第一极耳和第二极耳，所述第一极耳和所述第一导电件电连接，所述第二极耳和所述第二导电件电连接，
    所述第二导电件的外轮廓边缘位置设有定位标记，所述定位标记用于指示所述第二极耳在所述第二导电件上的焊接位置。
  22. 根据权利要求21所述的电池，其特征在于，所述定位标记的数量为两个，且两个所述定位标记相对于所述第二导电件的中心对称设置。
  23. 根据权利要求1-14任一项所述的电池，其特征在于，所述电极组件包括第一极耳、第二极耳、以及第一极片、第二极片和隔膜，
    所述第一极片、所述隔膜、所述第二极片依次层叠并卷绕，所述第一极耳电连接在所述第一极片上，所述第二极耳电连接在所述第二极片上，
    所述第一极片的卷绕首端和卷绕尾端均具有空箔区，所述第二极片的卷绕首端和卷绕尾端均具有空箔区，
    所述第一极耳电连接在所述第一极片的卷绕尾端的空箔区上，所述第二极耳电连接在所述第二极片的卷绕尾端的空箔区上。
  24. 一种电子设备，其特征在于，包括：电子设备本体和如权利要求1-23中任一项所述的电池，所述电池为所述电子设备本体提供电能。
PCT/CN2022/118605 2021-09-18 2022-09-14 电池及电子设备 WO2023040864A1 (zh)

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CN113675508A (zh) * 2021-09-18 2021-11-19 珠海冠宇电池股份有限公司 电池及电子设备
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CN114204221A (zh) * 2021-12-02 2022-03-18 宁德新能源科技有限公司 一种电化学装置、电池模组及电子装置
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