WO2026001900A1 - 电芯及用电设备 - Google Patents

电芯及用电设备

Info

Publication number
WO2026001900A1
WO2026001900A1 PCT/CN2025/102833 CN2025102833W WO2026001900A1 WO 2026001900 A1 WO2026001900 A1 WO 2026001900A1 CN 2025102833 W CN2025102833 W CN 2025102833W WO 2026001900 A1 WO2026001900 A1 WO 2026001900A1
Authority
WO
WIPO (PCT)
Prior art keywords
battery cell
edge
electrode
along
notch
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
PCT/CN2025/102833
Other languages
English (en)
French (fr)
Inventor
黄矗
林森
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ningde Amperex Technology Ltd
Original Assignee
Ningde Amperex Technology Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ningde Amperex Technology Ltd filed Critical Ningde Amperex Technology Ltd
Publication of WO2026001900A1 publication Critical patent/WO2026001900A1/zh
Pending legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H01M10/0413—Large-sized flat cells or batteries for motive or stationary systems with plate-like electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/054—Accumulators with insertion or intercalation of metals other than lithium, e.g. with magnesium or aluminium
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H01M10/0585—Construction or manufacture of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
    • H01M50/105—Pouches or flexible bags
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
    • H01M50/463—Separators, membranes or diaphragms characterised by their shape
    • 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
    • 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, and more specifically, to a battery cell and an electrical device.
  • battery cells typically use adhesive tape to insulate the electrodes from opposite polarities.
  • the overlap of the adhesive tape with the active material layer of the battery cell increases the cell's thickness and affects its energy density.
  • This application provides a battery cell and an electrical device that can improve the energy density of the battery cell.
  • this application provides a battery cell, which includes an electrode assembly.
  • the electrode assembly has a stacked structure and includes a plurality of first electrodes, a plurality of second electrodes, and a plurality of separators.
  • the first electrodes and second electrodes have opposite polarities.
  • the plurality of first electrodes and second electrodes are stacked along a first direction, and the plurality of separators are respectively disposed between the first electrodes and the second electrodes.
  • Each first electrode has a first empty foil area, and each second electrode has a first notch. Along the first direction, at least a portion of the first empty foil area is exposed to the first notch.
  • the first notch has a first edge and a second edge, and the first edge is connected to the second edge.
  • the separators have a first extended portion that extends beyond the second edge along a third direction, and the first extended portions of the plurality of separators are connected. When viewed along the first direction, the first extended portion is located within the first notch.
  • the first direction is the thickness direction of the electrode assembly, and the first direction, the second direction, and the third direction are perpendicular to each other.
  • each first electrode has a first empty foil area
  • each second electrode has a first notch.
  • the first empty foil area is exposed to the first notch, which can reduce the volume of the first empty foil area protruding from the electrode assembly.
  • the possibility of the electrode assembly shaking relative to the shell is small, and the possibility of the first empty foil area short-circuiting with the second electrode is also small, which can reduce the risk of thermal runaway of the battery cell.
  • the separator has a first protruding portion extending beyond the second edge along the third direction.
  • the first protruding portions of multiple separators are connected, so that the first protruding portions of multiple separators can achieve insulation between the first empty foil area and the second electrode. This can reduce the possibility of the first empty foil area short-circuiting with the second electrode when the battery cell is subjected to external force or dropped, resulting in higher safety of the battery cell.
  • the first protruding portion does not increase the thickness of the electrode assembly, and the first protruding portion is located within the first notch and does not extend beyond the edge of the electrode assembly in the length or width direction, thus having a small impact on the energy density of the battery cell.
  • the electrode assembly has a first side and a second side opposite to each other along a first direction; along the first direction, first protrusions of a plurality of diaphragms converge toward the first side and are connected.
  • the connection method of the first protruding parts of multiple diaphragms is simple and easy to operate.
  • the plurality of diaphragms includes a first diaphragm located on the second side, the width of the first extended portion of the first diaphragm along the third direction is W1, and the thickness of the electrode assembly is H1, satisfying W1 ⁇ H1.
  • the first extended portion of the first separator can extend to the second side of the electrode assembly, so that the first extended portions of multiple separators can be connected on the first side of the electrode assembly, thereby facilitating the fabrication of the battery cell.
  • the plurality of diaphragms includes a first diaphragm located on the second side, wherein the width of the first extended portion of the first diaphragm along the third direction is W1, satisfying W1 ⁇ 2mm.
  • the first extended portion of the first diaphragm can extend to the first side of the electrode assembly, so that the first extended portions of multiple diaphragms can be connected on the first side of the electrode assembly.
  • the plurality of diaphragms includes a second diaphragm located on a first side, wherein the width of the first extended portion of the second diaphragm along a third direction is W2, satisfying W2 ⁇ 0.2mm.
  • the first extensions of multiple diaphragms are connected to form a connecting portion, and when viewed along a third direction, there is a gap between the connecting portion and the first empty foil area.
  • the possibility of interference between the connecting part and the first empty foil area can be reduced, which facilitates the subsequent processing of the first empty foil area. It can also reduce the possibility of the first excess part of multiple diaphragms separating due to interference between the connecting part and other components, thereby further reducing the possibility of short circuit between the first empty foil area and the second electrode, making the cell safer.
  • the first extended portions of a plurality of diaphragms converge toward the center and connect in a first direction.
  • the connection method of the first protruding parts of multiple diaphragms is simpler and easier to operate. Furthermore, the widths of the first protruding parts of the first diaphragm located on the second side and the first protruding parts of the second diaphragm located on the first side are both smaller, thereby reducing the possibility of interference between the first protruding parts of multiple diaphragms and the first empty foil area during connection, and further facilitating the connection of the first protruding parts of multiple diaphragms.
  • the first overhangs of multiple diaphragms are thermally bonded.
  • the first empty foil area is located at the first corner of the first electrode, and the first notch is located at the second corner of the second electrode.
  • the second electrode has a second empty foil region located at a third corner
  • the first electrode has a second notch located at a fourth corner.
  • the second empty foil region and the second notch at least partially overlap.
  • the second notch has a third edge and a fourth edge, which are connected.
  • the second empty foil region extends beyond the third edge.
  • the diaphragm has a second extended portion extending beyond the fourth edge along a third direction, and the second extended portions of multiple diaphragms are connected.
  • the volume of the second empty foil area protruding from the electrode assembly can be reduced. This results in a smaller gap space reserved between the electrode assembly and the outer casing for accommodating the second empty foil area, which is beneficial for improving the energy density of the battery cell. Furthermore, when the battery cell is subjected to external force, the possibility of the electrode assembly shaking relative to the outer casing is smaller, and the possibility of the second empty foil area short-circuiting with the first electrode plate is also smaller, which can reduce the risk of thermal runaway of the battery cell.
  • the separator has a second protruding portion extending beyond the fourth edge along the third direction.
  • the second protruding portions of multiple separators are connected, enabling the second protruding portions of multiple separators to achieve insulation between the second empty foil area and the first electrode plate. This reduces the possibility of the second empty foil area short-circuiting with the first electrode plate when the battery cell is subjected to external force or drops, resulting in higher battery cell safety.
  • the second protruding portion does not increase the thickness of the electrode assembly, which is beneficial for improving the energy density of the battery cell.
  • the first notch has a fifth edge, the fifth edge and the second edge are spaced apart along a third direction, and the first edge connects the second edge and the fifth edge;
  • the diaphragm has a third overhang extending beyond the fifth edge along a third direction, and the third overhangs of a plurality of diaphragms are connected.
  • the diaphragm has a third overhang extending beyond the fifth edge in a third direction.
  • the third overhangs of multiple diaphragms are connected, so that the third overhangs of multiple diaphragms can achieve insulation between the first empty foil area and the second electrode. This makes it less likely that the first empty foil area and the second electrode will short-circuit when the cell is subjected to external force or dropped, thus making the cell safer.
  • the third overhang does not increase the thickness of the electrode assembly, which is beneficial to improving the energy density of the cell.
  • this application provides an electrical device including a battery cell as described above, the battery cell being used to provide electrical energy.
  • Figure 1 is a three-dimensional structural diagram of a battery cell provided in some embodiments of this application.
  • Figure 2 is a perspective view of a portion of the structure of a battery cell provided in some embodiments of this application;
  • Figure 3 is an exploded view of a portion of the battery cell structure provided in some embodiments of this application.
  • Figure 4 is a schematic diagram of the structure of the first electrode of the battery cell provided in some embodiments of this application.
  • Figure 5 is a schematic diagram of the structure of the second electrode of the battery cell provided in some embodiments of this application.
  • Figure 6 is a schematic diagram from one perspective of a portion of the battery cell structure provided in some embodiments of this application before the first extended portion is retracted;
  • Figure 7 is a schematic diagram from one perspective of the battery cell structure provided in some embodiments of this application in the state after the first extended part is retracted;
  • Figure 8 is a partially enlarged structural diagram of point A in the battery cell in Figure 6;
  • Figure 9 is a partially enlarged structural diagram of point B in the battery cell in Figure 2;
  • Figure 10 is a partially enlarged structural diagram of point C in the battery cell in Figure 6;
  • Figure 11 is a schematic diagram of the structure of the separator of the battery cell provided in some embodiments of this application.
  • Figure 12 is a schematic diagram from one perspective of a partial structure of a battery cell provided in some other embodiments of this application.
  • Figure 13 is a schematic diagram of the structure of the second electrode of the battery cell provided in some other embodiments of this application.
  • Icons 10-Battery cell; 100-Electrode assembly; 110-First electrode; 111-First empty foil area; 112-Second notch; 1121-Third edge; 1122-Fourth edge; 120-Second electrode; 121-First notch; 1211-First edge; 1212-Second edge; 1213-Fifth edge; 122-Second empty foil area; 130-Separator; 130a-First separator; 130b-Second separator; 131-First protrusion; 132-Second protrusion; 133-Third notch; 134-Fourth notch; 135-Third protrusion; 200-Housing; 310-First electrical connector; 320-Second electrical connector; 330-First seal; 340-Second seal; X-First direction; Y-Second direction; Z-Third direction. Specific implementation methods
  • batteries With the advancement of the new energy industry, batteries are gradually evolving towards higher energy density and higher power density.
  • the limited volume of the battery compartment in electrical equipment restricts the ability to increase energy density simply by increasing cell volume. Therefore, modifying the cell's structure to improve its energy density is a more feasible approach.
  • battery cells typically use adhesive tape to insulate the electrodes from opposite polarities.
  • the tape needs to cover a larger area. Consequently, part of the tape used for tab insulation is attached to the active material layer of the electrode. This means that the tape overlaps with the active material layer of the battery cell in the thickness direction, increasing the cell's thickness and thus affecting its energy density.
  • the electrode assembly has a stacked structure and includes multiple first electrodes, multiple second electrodes, and multiple separators.
  • the first electrodes and second electrodes have opposite polarities.
  • the multiple first electrodes and multiple second electrodes are stacked along a first direction, and multiple separators are respectively disposed between the first electrodes and the second electrodes.
  • Each first electrode has a first empty foil area, and each second electrode has a first notch.
  • the first notch has a first edge and a second edge, and the first edge is connected to the second edge.
  • the first empty foil area extends beyond the first edge.
  • the separators have a first extended portion that extends beyond the second edge along a third direction, and the first extended portions of the multiple separators are connected. When viewed along the first direction, the first extended portion is located within the first notch.
  • the first direction is the thickness direction of the electrode assembly, and the first direction, the second direction, and the third direction are perpendicular to each other.
  • each first electrode has a first empty foil area
  • each second electrode has a first notch.
  • the first empty foil area is exposed to the first notch, which reduces the volume of the first empty foil area protruding from the electrode assembly.
  • the possibility of the electrode assembly shaking relative to the casing is relatively small, and the possibility of a short circuit between the first empty foil area and the second electrode is also relatively small, which reduces the risk of thermal runaway in the battery cell.
  • the separator has a first protruding portion extending beyond the second edge along a third direction.
  • the first protruding portions of multiple separators are connected, so that the first protruding portions of multiple separators can achieve insulation between the first empty foil area and the second electrode. This reduces the possibility of a short circuit between the first empty foil area and the second electrode when the battery cell is subjected to external force or drops, resulting in higher safety of the battery cell.
  • the first protruding portion does not increase the thickness of the electrode assembly, and the first protruding portion is located within the first notch and does not extend beyond the edge of the electrode assembly in the length or width direction, thus having a small impact on the energy density of the battery cell.
  • the battery cell provided in this application embodiment can be a secondary battery or a primary battery, such as a lithium-ion battery, a sodium-ion battery, or a magnesium-ion battery, etc., and this application embodiment is not limited in this respect.
  • the battery cell can be cylindrical, flat, cuboid, or other shapes, etc., and this application embodiment is not limited in this respect either.
  • the electrical device can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc.
  • Figure 1 is a three-dimensional structural schematic diagram of a battery cell provided in some embodiments of this application
  • Figure 2 is a three-dimensional schematic diagram of a partial structure of a battery cell provided in some embodiments of this application
  • Figure 3 is an exploded schematic diagram of a partial structure of a battery cell provided in some embodiments of this application.
  • a battery cell 10 which includes an electrode assembly 100.
  • the electrode assembly 100 has a stacked structure and includes a plurality of first electrode plates 110, a plurality of second electrode plates 120, and a plurality of separators 130.
  • the first electrode plates 110 and the second electrode plates 120 have opposite polarities.
  • the plurality of first electrode plates 110 and the plurality of second electrode plates 120 are stacked along a first direction X, and the plurality of separators 130 are respectively disposed between the first electrode plates 110 and the second electrode plates 120.
  • Figure 4 is a schematic diagram of the structure of the first electrode of the battery cell provided in some embodiments of this application
  • Figure 5 is a schematic diagram of the structure of the second electrode of the battery cell provided in some embodiments of this application.
  • each first electrode 110 has a first empty foil region 111
  • each second electrode 120 has a first notch 121, with at least a portion of the first empty foil region 111 exposed to the first notch 121 along a first direction X.
  • each first electrode 110 have a first empty foil area 111 and each second electrode 120 have a first notch 121, with at least a portion of the first empty foil area 111 exposed to the first notch 121 along the first direction X, the volume of the first empty foil area 111 protruding from the electrode assembly 100 can be reduced, making the space reserved between the electrode assembly 100 and the housing for accommodating the first empty foil area 111 smaller.
  • This is beneficial to improving the energy density of the battery cell 10, and when the battery cell 10 is subjected to external force, the possibility of the electrode assembly 100 shaking relative to the housing is smaller, and the possibility of the first empty foil area 111 contacting and short-circuiting with the second electrode 120 is also smaller, which can reduce the risk of thermal runaway of the battery cell 10.
  • the battery cell 10 is arranged in a cuboid shape with rounded corners, which can better fit the rounded battery compartment in the electrical device.
  • the apex of the battery cell 10 may also be square.
  • Figure 6 is a schematic diagram from one perspective of the partial structure of the battery cell provided in some embodiments of this application before the first extended portion is retracted;
  • Figure 7 is a schematic diagram from one perspective of the partial structure of the battery cell provided in some embodiments of this application after the first extended portion is retracted;
  • Figure 8 is a partial enlarged structural schematic diagram of point A of the battery cell in Figure 6;
  • Figure 9 is a partial enlarged structural schematic diagram of point B of the battery cell in Figure 2.
  • the first notch 121 has a first edge 1211 and a second edge 1212, the first edge 1211 and the second edge 1212 are connected, and the first empty foil region 111 extends beyond the first edge 1211 along the second direction Y.
  • the separator 130 has a first protruding portion 131 extending beyond the second edge 1212 along the third direction Z, and the first protruding portions 131 of a plurality of separators 130 are connected.
  • the first direction X is the thickness direction of the electrode assembly 100, and the first direction X, the second direction Y, and the third direction Z are perpendicular to each other.
  • the first protruding portion 131 is located within the first notch 121, and the first notch 121 refers to the region enclosed by the extension lines of the edges of the cell in the second direction Y and the third direction Z and the first edge 1211 and the second edge 1212.
  • the first protruding portion 131 is located within the first notch 121 and does not extend beyond the edge of the cell in the length or width direction, and does not affect the energy density of the cell.
  • the first protruding portions 131 of the plurality of diaphragms 130 can achieve insulation between the first empty foil area 111 and the second electrode 120. This makes it less likely that the first empty foil area 111 and the second electrode 120 will come into contact and short-circuit when the cell 10 is subjected to external force or dropped, thus making the cell 10 safer. Furthermore, the first protruding portion 131 does not increase the thickness of the electrode assembly 100, which is beneficial to improving the energy density of the cell 10.
  • the electrode assembly 100 has a first side and a second side opposite to each other along a first direction X.
  • first protrusions 131 of a plurality of diaphragms 130 converge toward the first side and connect.
  • the connection method of the first protruding portions 131 of the plurality of diaphragms 130 is simple and easy to operate.
  • the plurality of diaphragms 130 includes a first diaphragm 130a located on the second side, the width of the first extended portion 131 of the first diaphragm 130a along the third direction Z is W1, and the thickness of the electrode assembly 100 is H1, satisfying W1 ⁇ H1.
  • W1 can be H1, 1.1*H1, or 1.3*H1, etc.
  • the width of the first extended portion 131 along the third direction Z is the width of the first extended portion 131 when it is in the extended state (i.e. before it is retracted).
  • the first extended portion 131 of the first diaphragm 130a can extend to the first side of the electrode assembly 100, so that the first extended portions 131 of the plurality of diaphragms 130 can be connected on the first side of the electrode assembly 100, thereby facilitating the fabrication of the battery cell 10.
  • the width of the first protruding portion 131 of the diaphragm 130 along the third direction Z is greater than or equal to the distance of the diaphragm 130 along the first direction X to the first side.
  • the width of the first protruding portion 131 of the diaphragm 120 located in the middle of the electrode assembly along the first direction X is greater than or equal to H1/2 along the third direction Z.
  • the first extended portions 131 of the plurality of separators 130 can all extend to the first side of the electrode assembly 100, so that the first extended portions 131 of the plurality of separators 130 can be connected to the first side of the electrode assembly 100, thereby facilitating the fabrication of the cell 10.
  • the plurality of diaphragms 130 includes a first diaphragm 130a located on the second side, wherein the width of the first extended portion 131 of the first diaphragm 130a along the third direction Z is W1, satisfying W1 ⁇ 2mm.
  • W1 can be 2mm, 2.1mm, or 2.3mm, etc.
  • the first protruding portion 131 of the first diaphragm 130a can extend to the first side of the electrode assembly 100, so that the first protruding portions 131 of the plurality of diaphragms 130 can be connected to the first side of the electrode assembly 100.
  • the plurality of diaphragms 130 includes a second diaphragm 130b located on a first side, wherein the width of the first protruding portion 131 of the second diaphragm 130b along the third direction Z is W2, satisfying W2 ⁇ 0.2 mm.
  • W2 can be 0.2 mm, 0.25 mm, or 0.3 mm, etc.
  • the distance from the diaphragm 130 to the first side along the first direction X is S
  • the width of the first protruding portion 131 of the diaphragm 130 along the third direction Z is greater than or equal to S+0.2mm.
  • the width of the first protruding portion 131 of the diaphragm 130 along the third direction Z is S+0.2mm, S+0.25mm, or S+0.3mm, etc.
  • the first extended portions 131 of the plurality of separators 130 can all extend to the first side of the electrode assembly 100, and facilitate the connection of the first extended portions 131 of the plurality of separators 130 to the first side of the electrode assembly 100, thereby facilitating the fabrication of the cell 10.
  • the first extensions 131 of a plurality of diaphragms 130 are connected to form a connecting portion, and when viewed along the third direction Z, there is a gap between the connecting portion and the first empty foil area 111.
  • the possibility of interference between the connecting part and the first empty foil area 111 can be reduced, which facilitates the subsequent processing of the first empty foil area 111. Furthermore, it can reduce the possibility of the first protruding part 131 of the multiple diaphragms 130 separating due to interference between the connecting part and other components. This further reduces the possibility of short circuit between the first empty foil area 111 and the second electrode 120, resulting in higher safety of the battery cell 10.
  • the first protruding portions 131 of the plurality of diaphragms 130 converge toward the center and connect in a first direction X.
  • the first extended portion 131 of this application means that the first extended portion 131 is pressed together in the first direction X.
  • the connection method of the first protruding portions 131 of the multiple diaphragms 130 is simpler and easier to operate. Furthermore, the widths of the first protruding portions 131 of the first diaphragm 130a on the second side and the first protruding portions 131 of the second diaphragm 130b on the first side are both smaller. This reduces the possibility of interference between the first protruding portions 131 of the multiple diaphragms 130 and the first empty foil area 111 during connection, further facilitating the connection of the first protruding portions 131 of the multiple diaphragms 130.
  • the first overhangs 131 of the plurality of diaphragms 130 are heat-fused together.
  • the adhesive tape is layered with the tab along a first direction.
  • the two sheets adhere to each other on both sides of the tab along a third direction, thus covering the tab and insulating it from the electrode.
  • the adhesive tape is soaked in electrolyte, its adhesion decreases, making it prone to failure and separation at the joint, resulting in exposed tabs and a significant risk of short circuits between the tabs and the electrode.
  • the first protruding portions 131 of multiple separators 130 are integrated, which reduces the possibility of the first protruding portions 131 of multiple separators 130 separating after being immersed in electrolyte. This allows the first protruding portions 131 of multiple separators 130 to maintain insulation from the first empty foil area 111 and the second electrode 120, further reducing the possibility of short circuit between the first empty foil area 111 and the second electrode 120, thus making the cell 10 safer.
  • the width of the first protruding portion 131 of the diaphragm 130 can be set to be large.
  • the width of the first protruding portion 131 of each diaphragm 130 is greater than the thickness of the electrode assembly 100.
  • the diaphragm 130 can also be prepared according to the required width of the first protruding portion 131 of each diaphragm layer 130 during preparation.
  • the width of the first protruding portion 131 of the first diaphragm 130a is greater than or equal to the thickness of the electrode assembly 100.
  • the width of the first protruding portion 131 of the second diaphragm 130b is less than the distance between the first empty foil area 111 and the second electrode 120 along the third direction Z.
  • the first empty foil area 111 is located at the first corner of the first electrode 110, and the first notch 121 is located at the second corner of the second electrode 120.
  • first empty foil region 111 By positioning the first empty foil region 111 at the first corner of the first electrode 110 and the first notch 121 at the second corner of the second electrode 120, it is easier to prepare the first notch 121 and the first empty foil region 111, and it is also easier to bring out the first empty foil region 111.
  • corner position refers to the position at the apex of the electrode.
  • first corner position is the corner formed by the edge of the first electrode 110 along the second direction Y and the edge along the third direction X.
  • the first corner position and the second corner position are two adjacent corner positions of the first pole piece 110.
  • the first empty foil area 111 and the second empty foil area 122 can be led out from the same end of the electrode assembly 100, which facilitates the battery cell 10 to be electrically connected to an external device through the first empty foil area 111 and the second empty foil area 122.
  • first corner and the second corner can be two opposite corners of the first electrode 110. This can be applied to structures where the first empty foil area 111 and the second empty foil area 122 need to be led out from opposite ends of the cell 10.
  • Figure 10 is a partially enlarged structural diagram of point C in the battery cell in Figure 6.
  • the second electrode 120 has a second empty foil region 122 located at the third corner
  • the first electrode 110 has a second notch 112 located at the fourth corner.
  • the second empty foil region 122 and the second notch 112 at least partially overlap.
  • the volume of the second empty foil region 122 protruding from the electrode assembly 100 can be reduced. This results in a smaller gap space reserved between the electrode assembly 100 and the outer casing for accommodating the second empty foil region 122, which is beneficial for improving the energy density of the battery cell 10. Furthermore, when the battery cell 10 is subjected to external force, the possibility of the electrode assembly 100 shaking relative to the outer casing is smaller, and the possibility of the second empty foil region 122 short-circuiting with the first electrode 110 is also smaller, which can reduce the risk of thermal runaway of the battery cell 10.
  • the second empty foil region 122 By positioning the second empty foil region 122 at the triangular position of the second electrode 120 and the second notch 112 at the fourth corner position of the first electrode 110, it is easier to prepare the second notch 112 and the second empty foil region 122, and it is also easier to lead out the second empty foil region 122.
  • the second notch 112 has a third edge 1121 and a fourth edge 1122, the third edge 1121 being connected to the fourth edge 1122, and the second empty foil region 122 extending beyond the third edge 1121 along the second direction Y.
  • the diaphragm 130 has a second extension portion 132 extending beyond the fourth edge 1122 along the third direction Z, and the second extension portions 132 of a plurality of diaphragms 130 are connected.
  • the second protruding portions 132 of the plurality of diaphragms 130 can achieve insulation between the second empty foil area 122 and the first electrode 110. This makes it less likely that the second empty foil area 122 will come into contact with the first electrode 110 and short-circuit when the cell 10 is subjected to external force or dropped, thus making the cell 10 safer. Furthermore, the second protruding portion 132 does not increase the thickness of the electrode assembly 100, which is beneficial to improving the energy density of the cell 10.
  • Figure 11 is a schematic diagram of the structure of the separator of the battery cell provided in some embodiments of this application.
  • the diaphragm 130 has a third notch 133 and a fourth notch 134, and along the first direction X, the first empty foil region 111 at least partially overlaps with the third notch 133, and the second empty foil region 122 at least partially overlaps with the fourth notch 134.
  • the diaphragm 130 By making the diaphragm 130 have a third notch 133 and a fourth notch 134, along the first direction X, the first empty foil region 111 at least partially overlaps with the third notch 133, and the second empty foil region 122 at least partially overlaps with the fourth notch 134, so that the third notch 133 can be used to accommodate the first empty foil region 111 and the fourth notch 134 can be used to accommodate the second empty foil region 122, which facilitates the connection of multiple first empty foil regions 111 and multiple second empty foil regions 122 respectively.
  • the first notch 121 and the second empty foil region 122 are located at one end of the second electrode 120 along the second direction Y, and the first notch 121 and the second empty foil region 122 are spaced apart along the third direction Z.
  • the first empty foil area 111 and the second empty foil area 122 can be led out from one end of the electrode assembly 110 along the second direction Y, facilitating electrical connection of the battery cell 10 to an external device via the first empty foil area 111 and the second empty foil area 122.
  • the first notch 121 and the second empty foil area 122 are spaced apart along the third direction Z, reducing the possibility of short circuits between the first empty foil area 111 and the second electrode 120, and between the second empty foil area 122 and the first electrode 110, thereby reducing the possibility of thermal runaway of the battery cell 10 and improving its safety.
  • the third and fourth corner positions are two adjacent corner positions of the second pole piece 120.
  • the first empty foil area 111 and the second empty foil area 122 can be led out from the same end of the electrode assembly 100, which facilitates the battery cell 10 to be electrically connected to an external device through the first empty foil area 111 and the second empty foil area 122.
  • the third and fourth corner positions can be two opposite corner positions of the second electrode 120. This can be applied to structures where the first empty foil region 111 and the second empty foil region 122 need to be led out from opposite ends of the cell 10.
  • the first electrode 110 is a positive electrode and the second electrode 120 is a negative electrode.
  • Figure 12 is a schematic diagram of a partial structure of a battery cell provided in some other embodiments of this application from one perspective;
  • Figure 13 is a schematic diagram of the structure of the second electrode of a battery cell provided in some other embodiments of this application.
  • the first notch 121 has a fifth edge 1213, which is spaced apart from the second edge 1212 along a third direction Z, and the first edge 1211 connects the second edge 1212 and the fifth edge 1213.
  • the diaphragm 130 has a third protruding portion 135 extending beyond the fifth edge 1213 along a third direction Z, and the third protruding portions 135 of a plurality of diaphragms 130 are connected.
  • the third overhang 135 of the plurality of diaphragms 130 can achieve insulation between the first empty foil area 111 and the second electrode 120. This makes it less likely that the first empty foil area 111 and the second electrode 120 will short-circuit when the cell 10 is subjected to external force or dropped, thus making the cell 10 safer. Furthermore, the third overhang 135 does not increase the thickness of the electrode assembly 100, which is beneficial to improving the energy density of the cell 10.
  • the battery cell 10 includes a housing 200 having an accommodating space, and the electrode assembly 100 is disposed in the accommodating space.
  • the housing 200 is a packaging bag, which simplifies the installation of the housing 200 and the electrode assembly 100.
  • the housing 200 can be made of a high-strength material, such as steel, aluminum alloy, or other metallic materials, giving the housing 200 high load-bearing capacity. This makes the housing 200 less prone to deformation or damage due to stress or environmental changes, thereby increasing the reliability of the battery cell 10.
  • the housing 200 can also be made of high-strength non-metallic materials such as carbon fiber or rigid plastic.
  • the battery cell includes an electrode assembly 100, a housing 200, and an electrolyte.
  • the housing 200 houses the electrode assembly 100 and the electrolyte.
  • the electrode assembly 100 consists of a positive electrode, a negative electrode, and a separator 130.
  • the battery cell 10 primarily operates by the movement of metal ions between the positive and negative electrode plates.
  • the positive electrode includes a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive current collector, and the portion of the positive current collector without the positive active material layer serves as the positive electrode tab, through which electrical energy is input or output to the positive electrode.
  • the material of the positive current collector can be aluminum, and the positive active material can be lithium cobalt oxide, lithium iron phosphate, ternary materials, or lithium manganese oxide, etc.
  • the negative electrode includes a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative current collector, and the portion of the negative current collector without the negative active material layer serves as the negative electrode tab, through which electrical energy is input or output.
  • the negative current collector can be made of copper, and the negative active material can be made of carbon or silicon, etc.
  • the separator can be made of polypropylene (PP) or polyethylene (PE), etc.
  • the electrolyte can include organic solvents, lithium salts, etc.
  • the battery cell 10 further includes a first electrical connector 310, which is connected to a first empty foil area 111 and extends out of the housing 200.
  • first electrical connector 310 By connecting the first electrical connector 310 to the first empty foil area 111, and extending the first electrical connector 310 out of the housing 200, it is possible to facilitate the electrical connection of external devices to the electrode assembly 100 through the first electrical connector 310.
  • the battery cell 10 further includes a second electrical connector 320, which is connected to the second empty foil area 122 and extends out of the housing 200.
  • the battery cell 10 further includes a first seal 330 disposed between the first electrical connector 310 and the housing 200.
  • the sealing performance between the first electrical connector 310 and the housing 200 can be improved, and the sealing performance of the battery cell 10 can be improved.
  • the battery cell 10 further includes a second seal 340 disposed between the second electrical connector 320 and the housing 200.
  • the sealing performance between the second electrical connector 320 and the housing 200 is improved, and the sealing performance of the battery cell 10 is also improved.
  • This application provides an electrical device, including a battery cell 10 according to any of the above schemes, the battery cell 10 being used to provide electrical energy to the electrical device.
  • the electrical equipment can be any of the aforementioned devices or systems using battery cell 10.

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  • Chemical Kinetics & Catalysis (AREA)
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Abstract

本申请提供了一种电芯及用电设备，该电芯包括电极组件，电极组件为叠片式结构，电极组件包括多个第一极片、多个第二极片以及多个隔膜，每个第一极片具有第一空箔区，每个第二极片具有第一缺口，沿第一方向，第一空箔区的至少部分暴露于第一缺口；第一缺口具有连接的第一边缘和第二边缘，沿第二方向，第一空箔区超出第一边缘；隔膜具有沿第三方向超出第二边缘的第一超出部，多个隔膜的第一超出部连接，沿第一方向观察，第一超出部位于第一缺口内。能够实现第一空箔区与第二极片之间的绝缘，能够使得电芯受外力作用或跌落时，第一空箔区与第二极片接触短路的可能性较低，使得电芯的安全性较高，并且对电芯的能量密度的影响较小。

Description

电芯及用电设备
相关申请的交叉引用
本申请要求享有于2024年06月26日提交的名称为“电芯及用电设备”中国专利申请CN202410840359.3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，具体而言，涉及一种电芯及用电设备。
背景技术
随着电子信息技术的飞速发展，各种电子设备也朝着智能化和多功能化的方向发展，对电池的安全性要求也越来越高。
目前，电芯的极耳一般通过贴附胶纸以实现与其极性相反的极片的绝缘，但是胶纸与电芯的活性物质层重叠，会增加电芯的厚度，影响电芯的能量密度。
发明内容
本申请提供一种电芯及用电设备，能够提高电芯的能量密度。
第一方面，本申请提供一种电芯，电芯包括电极组件，电极组件为叠片式结构，电极组件包括多个第一极片、多个第二极片以及多个隔膜，第一极片与第二极片极性相反，多个第一极片和多个第二极片沿第一方向层叠设置，多个隔膜分别设置于第一极片和第二极片之间；每个第一极片具有第一空箔区，每个第二极片具有第一缺口，沿第一方向，第一空箔区的至少部分暴露于第一缺口；第一缺口具有第一边缘和第二边缘，第一边缘与第二边缘连接，沿第二方向，第一空箔区超出第一边缘；隔膜具有沿第三方向超出第二边缘的第一超出部，多个隔膜的第一超出部连接；沿第一方向观察，第一超出部位于第一缺口内；第一方向为电极组件的厚度方向，第一方向、第二方向、第三方向两两垂直。
在上述技术方案中，每个第一极片具有第一空箔区，每个第二极片具有第一缺口，沿第一方向，第一空箔区的至少部分暴露于第一缺口，能够减小第一空箔区凸出于电极组件的体积，使得电极组件和外壳之间预留的用于容置第一空箔区的间隔空间较小，有利于提高电芯的能量密度，且在电芯受外力作用时，电极组件相对外壳晃动的可能性较小，第一空箔区与第二极片接触短路的可能性也较小，能够减小电芯产生热失控的风险；隔膜具有沿第三方向超出第二边缘的第一超出部，多个隔膜的第一超出部连接，使得多个隔膜的第一超出部能够实现第一空箔区与第二极片之间的绝缘，能够使得电芯受外力作用或跌落时，第一空箔区与第二极片接触短路的可能性较低，使得电芯的安全性较高，并且第一超出部不会增加电极组件的厚度，且第一超出部位于第一缺口内不会超出电极组件的长度方向或者宽度方向的边缘，对电芯的能量密度的影响较小。
在本申请的一些实施例中，电极组件具有沿第一方向相对的第一侧和第二侧；沿第一方向，多个隔膜的第一超出部朝向第一侧收拢并连接。
在上述技术方案中，通过使得沿第一方向，多个隔膜的第一超出部朝向第一侧收拢并连接，能够使得多个隔膜的第一超出部的连接方式简单，易于操作。
在本申请的一些实施例中，多个隔膜包括位于第二侧的第一隔膜，第一隔膜的第一超出部沿第三方向的宽度为W1，电极组件的厚度为H1，满足W1≥H1。
在上述技术方案中，通过使得第一隔膜的第一超出部沿第三方向的宽度W1、电极组件的厚度H1满足W1≥H1，使得第一隔膜的第一超出部能够延伸至电极组件的第二侧，以使得多个隔膜的第一超出部能够在电极组件的第一侧连接，从而便于电芯的制备。
在本申请的一些实施例中，多个隔膜包括位于第二侧的第一隔膜，第一隔膜的第一超出部沿第三方向的宽度为W1，满足W1≥2mm。
在上述技术方案中，通过使得第一隔膜的第一超出部沿第三方向的宽度W1满足W1≥2mm，使得第一隔膜的第一超出部能够延伸至电极组件的第一侧，以使得多个隔膜的第一超出部能够在电极组件的第一侧连接。
在本申请的一些实施例中，多个隔膜包括位于第一侧的第二隔膜，第二隔膜的第一超出部沿第三方向的宽度为W2，满足W2≥0.2mm。
在上述技术方案中，通过使得第二隔膜的第一超出部沿第三方向的宽度W2满足W2≥0.2mm，能够便于第二隔膜的第一超出部与其他隔膜的第一超出部连接，使得连接面积较大，连接可靠性较高。
在本申请的一些实施例中，多个隔膜的第一超出部连接形成连接部，沿第三方向观察，连接部与第一空箔区之间具有间隙。
在上述技术方案中，通过使得沿第三方向观察，连接部与第一空箔区之间具有间隙，能够减小连接部与第一空箔区干涉的可能性，便于后续对第一空箔区进行处理，并且能够减小连接部与其他部件干涉而导致多个隔膜的第一超出部分离的可能性，从而能够进一步减小第一空箔区与第二极片接触短路的可能性，使得电芯的安全性较高。
在本申请的一些实施例中，多个隔膜的第一超出部在第一方向上向中间收拢并连接。
在上述技术方案中，通过使得多个隔膜的第一超出部在第一方向上向中间收拢并连接，能够使得多个隔膜的第一超出部的连接方式较简单，易于操作，且能够使得位于第二侧的第一隔膜的第一超出部和位于第一侧的第二隔膜的第一超出部的宽度都较小，从而能够使得多个隔膜的第一超出部在连接时与第一空箔区干涉的可能性较小，进一步便于多个隔膜的第一超出部进行连接。
在本申请的一些实施例中，多个隔膜的第一超出部热熔粘接。
在上述技术方案中，通过使得多个隔膜的第一超出部热熔粘接，能够使得多个隔膜的第一超出部在被电解液浸泡后分离的可能性较小，从而使得多个隔膜的第一超出部能够保持对第一空箔区和第二极片的绝缘，进一步减小第一空箔区与第二极片接触短路的可能性，使得电芯的安全性更高。
在本申请的一些实施例中，第一空箔区位于第一极片的第一角位，第一缺口位于第二极片的第二角位。
在上述技术方案中，通过使得第一空箔区位于第一极片的第一角位，第一缺口位于第二极片的第二角位，能够便于第一缺口、第一空箔区的制备，并且便于第一空箔区的引出。
在本申请的一些实施例中，第二极片具有位于第三角位的第二空箔区，第一极片具有位于第四角位的第二缺口，沿第一方向，第二空箔区与第二缺口至少部分重叠；第二缺口具有第三边缘和第四边缘，第三边缘与第四边缘连接，沿第二方向，第二空箔区超出第三边缘；隔膜具有沿第三方向超出第四边缘的第二超出部，多个隔膜的第二超出部连接。
在上述技术方案中，通过使得沿第一方向，第二空箔区与第二缺口至少部分重叠，能够减小第二空箔区凸出于电极组件的体积，使得电极组件和外壳之间预留的用于容置第二空箔区的间隔空间较小，有利于提高电芯的能量密度，且在电芯受外力作用时，电极组件相对外壳晃动的可能性较小，第二空箔区与第一极片接触短路的可能性也较小，能够减小电芯产生热失控的风险；通过使得第二空箔区位于第二极片的第三角位，第二缺口位于第一极片的第四角位，能够便于第二缺口、第二空箔区的制备，并且便于第二空箔区的引出；隔膜具有沿第三方向超出第四边缘的第二超出部，多个隔膜的第二超出部连接，使得多个隔膜的第二超出部能够实现第二空箔区与第一极片之间的绝缘，能够使得电芯受外力作用或跌落时，第二空箔区与第一极片接触短路的可能性较低，使得电芯的安全性较高，并且第二超出部不会增加电极组件的厚度，有利于提高电芯的能量密度。
在本申请的一些实施例中，第一缺口具有第五边缘，第五边缘与第二边缘沿第三方向间隔设置，第一边缘连接第二边缘和第五边缘；隔膜具有沿第三方向超出第五边缘的第三超出部，多个隔膜的第三超出部连接。
在上述技术方案中，隔膜具有沿第三方向超出第五边缘的第三超出部，多个隔膜的第三超出部连接，使得多个隔膜的第三超出部能够实现第一空箔区与第二极片之间的绝缘，能够使得电芯受外力作用或跌落时，第一空箔区与第二极片接触短路的可能性较低，使得电芯的安全性较高，并且第三超出部不会增加电极组件的厚度，有利于提高电芯的能量密度。
第二方面，本申请提供一种用电设备，包括如上述的电芯，电芯用于提供电能。
附图说明
为了更清楚地说明本申请实施例的技术方案，下面将对实施例中所需要使用的附图作简单地介绍，应当理解，以下附图仅示出了本申请的某些实施例，因此不应被看作是对范围的限定，对于本领域普通技术人员来讲，还可以根据这些附图获得其他相关的附图。
图1为本申请一些实施例提供的电芯的立体结构示意图；
图2为本申请一些实施例提供的电芯的部分结构的立体示意图；
图3为本申请一些实施例提供的电芯的部分结构的爆炸示意图；
图4为本申请一些实施例提供的电芯的第一极片的结构示意图；
图5为本申请一些实施例提供的电芯的第二极片的结构示意图；
图6为本申请一些实施例提供的电芯的部分结构处于第一超出部收拢前的状态的一个视角的示意图；
图7为本申请一些实施例提供的电芯的部分结构处于第一超出部收拢后的状态的一个视角的示意图；
图8为图6中电芯的A处的局部放大结构示意图；
图9为图2中电芯的B处的局部放大结构示意图；
图10为图6中电芯的C处的局部放大结构示意图；
图11为本申请一些实施例提供的电芯的隔膜的结构示意图；
图12为本申请另一些实施例提供的电芯的部分结构的一个视角的示意图；
图13为本申请另一些实施例提供的电芯的第二极片的结构示意图。
图标：10-电芯；100-电极组件；110-第一极片；111-第一空箔区；112-第二缺口；1121-第三边缘；1122-第四边缘；120-第二极片；121-第一缺口；1211-第一边缘；1212-第二边缘；1213-第五边缘；122-第二空箔区；130-隔膜；130a第一隔膜；130b-第二隔膜；131-第一超出部；132-第二超出部；133-第三缺口；134-第四缺口；135-第三超出部；200-壳体；310-第一电连接件；320-第二电连接件；330-第一密封件；340-第二密封件；X-第一方向；Y-第二方向；Z-第三方向。
具体实施例方式
为使本申请的目的、技术方案和优点更加清楚，下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行清楚地描述，显然，所描述的实施例是本申请一部分实施例，而不是全部的实施例。基于本申请中的实施例，本领域普通技术人员所获得的所有其他实施例，都属于本申请保护的范围。
除非另有定义，本申请所使用的所有的技术和科学术语与属于本申请的技术领域的技术人员通常理解的含义相同；在本申请的说明书中所使用的术语只是为了描述具体的实施例的目的，不是旨在于限制本申请；本申请的说明书和权利要求书及上述附图说明中的术语“包括”和“具有”以及它们的任何变形，意图在于覆盖不排他的包含。
本申请的说明书和权利要求书或上述附图中的术语“第一”、“第二”等是用于区别不同对象，而不是用于描述特定顺序或主次关系。
在本申请中提及“实施例”意味着，结合实施例描述的特定特征、结构或特性可以包含在本申请的至少一个实施例中。在说明书中的各个位置出现该短语并不一定均是指相同的实施例，也不是与其它实施例互斥的独立的或备选的实施例。
在本申请的实施例中，相同的附图标记表示相同的部件，并且为了简洁，在不同实施例中，省略对相同部件的详细说明。应理解，附图示出的本申请实施例中的各种部件的厚度、长宽等尺寸，以及集成装置的整体厚度、长宽等尺寸仅为示例性说明，而不应对本申请构成任何限定。
电池具有能量密度高、环境污染小、功率密度大、使用寿命长、适应范围广、自放电系数小等突出的优点，是现今新能源发展的重要组成部分。随着新能源行业的发展，电池逐步朝着高能量密度、高功率密度的方向发展。然而用电设备用于容置电芯的电池仓的体积有限，使得通过增大电芯的体积而提高电芯的能量密度的方式受限。因此，通过改变电芯本身的结构以提高电芯的能量密度的可行性更高。
目前，电芯的极耳一般通过贴附胶纸以实现与其极性相反的极片的绝缘，但是为了使得胶纸贴附更加牢固，需要使得胶纸的贴附面积较大，因此，用于极耳绝缘的胶纸的部分贴附于极片的活性物质层上，即在电芯的厚度方向上，胶纸与电芯的活性物质层重叠，使得电芯的厚度增加，从而影响电芯的能量密度。
为了提高电芯的能量密度，本申请提供了一种电芯，电芯包括电极组件，电极组件为叠片式结构，电极组件包括多个第一极片、多个第二极片以及多个隔膜，第一极片与第二极片极性相反，多个第一极片和多个第二极片沿第一方向层叠设置，多个隔膜分别设置于第一极片和第二极片之间；每个第一极片具有第一空箔区，每个第二极片具有第一缺口，沿第一方向，第一空箔区的至少部分暴露于第一缺口；第一缺口具有第一边缘和第二边缘，第一边缘与第二边缘连接，沿第二方向，第一空箔区超出第一边缘；隔膜具有沿第三方向超出第二边缘的第一超出部，多个隔膜的第一超出部连接；沿第一方向观察，第一超出部位于第一缺口内；第一方向为电极组件的厚度方向，第一方向、第二方向、第三方向两两垂直。
在这种结构的电芯中，每个第一极片具有第一空箔区，每个第二极片具有第一缺口，沿第一方向，第一空箔区的至少部分暴露于第一缺口，能够减小第一空箔区凸出于电极组件的体积，使得电极组件和外壳之间预留的用于容置第一空箔区的间隔空间较小，有利于提高电芯的能量密度，且在电芯受外力作用时，电极组件相对外壳晃动的可能性较小，第一空箔区与第二极片接触短路的可能性也较小，能够减小电芯产生热失控的风险；隔膜具有沿第三方向超出第二边缘的第一超出部，多个隔膜的第一超出部连接，使得多个隔膜的第一超出部能够实现第一空箔区与第二极片之间的绝缘，能够使得电芯受外力作用或跌落时，第一空箔区与第二极片接触短路的可能性较低，使得电芯的安全性较高，并且第一超出部不会增加电极组件的厚度，且第一超出部位于第一缺口内不会超出电极组件的长度方向或者宽度方向的边缘，对电芯的能量密度的影响较小。
本申请实施例提供的电芯可以是二次电池或一次电池，例如可以是锂离子电池、钠离子电池或镁离子电池等，本申请实施例对此并不限定。电芯可呈圆柱体、扁平体、长方体或其它形状等，本申请实施例对此也不限定。
本申请实施例提供一种使用电芯作为电源的用电设备，用电设备可以为但不限于手机、平板、笔记本电脑、电动玩具、电动工具、电瓶车、电动汽车、轮船、航天器等等。
参见图1至图3，图1为本申请一些实施例提供的电芯的立体结构示意图；图2为本申请一些实施例提供的电芯的部分结构的立体示意图；图3为本申请一些实施例提供的电芯的部分结构的爆炸示意图。
本申请一些实施例提供一种电芯10，电芯10包括电极组件100，电极组件100为叠片式结构，电极组件100包括多个第一极片110、多个第二极片120以及多个隔膜130，第一极片110与第二极片120极性相反，多个第一极片110和多个第二极片120沿第一方向X层叠设置，多个隔膜130分别设置于第一极片110和第二极片120之间。
一并参见图4和图5，图4为本申请一些实施例提供的电芯的第一极片的结构示意图；图5为本申请一些实施例提供的电芯的第二极片的结构示意图。
在一些实施例中，每个第一极片110具有第一空箔区111，每个第二极片120具有第一缺口121，沿第一方向X，第一空箔区111的至少部分暴露于第一缺口121。
通过使得每个第一极片110具有第一空箔区111，每个第二极片120具有第一缺口121，沿第一方向X，第一空箔区111的至少部分暴露于第一缺口121，能够减小第一空箔区111凸出于电极组件100的体积，使得电极组件100和外壳之间预留的用于容置第一空箔区111的间隔空间较小，有利于提高电芯10的能量密度，且在电芯10受外力作用时，电极组件100相对外壳晃动的可能性较小，第一空箔区111与第二极片120接触短路的可能性也较小，能够减小电芯10产生热失控的风险。
在一些实施例中，电芯10呈长方体设置，且顶角呈圆角设置，能够更好地适配用电设备内的圆角电池仓。
在另一些实施例中，电芯10的顶角也可以呈方角设置。
一并参见图6至图9，图6为本申请一些实施例提供的电芯的部分结构处于第一超出部收拢前的状态的一个视角的示意图；图7为本申请一些实施例提供的电芯的部分结构处于第一超出部收拢后的状态的一个视角的示意图；图8为图6中电芯的A处的局部放大结构示意图；图9为图2中电芯的B处的局部放大结构示意图。
在一些实施例中，第一缺口121具有第一边缘1211和第二边缘1212，第一边缘1211与第二边缘1212连接，沿第二方向Y，第一空箔区111超出第一边缘1211。隔膜130具有沿第三方向Z超出第二边缘1212的第一超出部131，多个隔膜130的第一超出部131连接。第一方向X为电极组件100的厚度方向，第一方向X、第二方向Y、第三方向Z两两垂直。沿第一方向X观察，第一超出部131位于第一缺口121内，第一缺口121指的是电芯在第二方向Y和第三方向Z的边缘的延长线和第一边缘1211、第二边缘1212围合成的区域。第一超出部131位于第一缺口121内不会超出电芯的长度方向或者宽度方向的边缘，不会影响到电芯的能量密度。
通过使得隔膜130具有沿第三方向Z超出第二边缘1212的第一超出部131，多个隔膜130的第一超出部131连接，使得多个隔膜130的第一超出部131能够实现第一空箔区111与第二极片120之间的绝缘，能够使得电芯10受外力作用或跌落时，第一空箔区111与第二极片120接触短路的可能性较低，使得电芯10的安全性较高，并且第一超出部131不会增加电极组件100的厚度，有利于提高电芯10的能量密度。
在一些实施例中，电极组件100具有沿第一方向X相对的第一侧和第二侧。沿第一方向X，多个隔膜130的第一超出部131朝向第一侧收拢并连接。
通过使得沿第一方向X，多个隔膜130的第一超出部131朝向第一侧收拢并连接，能够使得多个隔膜130的第一超出部131的连接方式简单，易于操作。
在一些实施例中，多个隔膜130包括位于第二侧的第一隔膜130a，第一隔膜130a的第一超出部131沿第三方向Z的宽度为W1，电极组件100的厚度为H1，满足W1≥H1。例如，W1可以为H1、1.1*H1或1.3*H1等。
其中，第一超出部131沿第三方向Z的宽度为第一超出部131处于展开状态(即收拢前)时的宽度。
通过使得第一隔膜130a的第一超出部131沿第三方向Z的宽度W1、电极组件100的厚度H1满足W1≥H1，使得第一隔膜130a的第一超出部131能够延伸至电极组件100的第一侧，以使得多个隔膜130的第一超出部131能够在电极组件100的第一侧连接，从而便于电芯10的制备。
在一些实施例中，隔膜130的第一超出部131沿第三方向Z的宽度大于或等于该隔膜130沿第一方向X至第一侧的距离。例如，沿第一方向X位于电极组件的中部的隔膜120的第一超出部131沿第三方向Z的宽度大于或等于H1/2。
通过使得隔膜130的第一超出部131沿第三方向Z的宽度大于或等于隔膜130沿第一方向X至第一侧的距离，使得多个隔膜130的第一超出部131都能够延伸至电极组件100的第一侧，以使得多个隔膜130的第一超出部131能够在电极组件100的第一侧连接，从而便于电芯10的制备。
在一些实施例中，多个隔膜130包括位于第二侧的第一隔膜130a，第一隔膜130a的第一超出部131沿第三方向Z的宽度为W1，满足W1≥2mm。例如W1可以为2mm、2.1mm或2.3mm等。
通过使得第一隔膜130a的第一超出部131沿第三方向Z的宽度W1满足W1≥2mm，使得第一隔膜130a的第一超出部131能够延伸至电极组件100的第一侧，以使得多个隔膜130的第一超出部131能够在电极组件100的第一侧连接。
在一些实施例中，多个隔膜130包括位于第一侧的第二隔膜130b，第二隔膜130b的第一超出部131沿第三方向Z的宽度为W2，满足W2≥0.2mm。例如W2可以为0.2mm、0.25mm或0.3mm等。
通过使得第二隔膜130b的第一超出部131沿第三方向Z的宽度W2满足W2≥0.2mm，能够便于第二隔膜130b的第一超出部131与其他隔膜130的第一超出部131连接，使得连接面积较大，连接可靠性较高。
在一些实施例中，隔膜130沿第一方向X至第一侧的距离为S，该隔膜130的第一超出部131沿第三方向Z的宽度大于或等于S+0.2mm。例如，隔膜130的第一超出部131沿第三方向Z的宽度为S+0.2mm、S+0.25mm或S+0.3mm等。
通过使得隔膜130的第一超出部131沿第三方向Z的宽度大于或等于S+0.2mm，使得多个隔膜130的第一超出部131都能够延伸至电极组件100的第一侧，且便于多个隔膜130的第一超出部131在电极组件100的第一侧连接，从而便于电芯10的制备。
在一些实施例中，多个隔膜130的第一超出部131连接形成连接部，沿第三方向Z观察，连接部与第一空箔区111之间具有间隙。
通过使得沿第三方向Z观察，连接部与第一空箔区111之间具有间隙，能够减小连接部与第一空箔区111干涉的可能性，便于后续对第一空箔区111进行处理，并且能够减小连接部与其他部件干涉而导致多个隔膜130的第一超出部131分离的可能性，从而能够进一步减小第一空箔区111与第二极片120接触短路的可能性，使得电芯10的安全性较高。
在一些实施例中，多个隔膜130的第一超出部131在第一方向X上向中间收拢并连接。
本申请的第一超出部131收拢是指沿第一方向X将第一超出部131压到接触在一起。
通过使得多个隔膜130的第一超出部131在第一方向X上向中间收拢并连接，能够使得多个隔膜130的第一超出部131的连接方式较简单，易于操作，且能够使得位于第二侧的第一隔膜130a的第一超出部131和位于第一侧的第二隔膜130b的第一超出部131的宽度都较小，从而能够使得多个隔膜130的第一超出部131在连接时与第一空箔区111干涉的可能性较小，进一步便于多个隔膜130的第一超出部131进行连接。
在一些实施例中，多个隔膜130的第一超出部131热熔粘接。
目前，在通过胶纸实现极耳绝缘的电芯中，胶纸沿第一方向与极耳层叠设置，通过在极耳沿第一方向的两侧分别贴附两张胶纸，使得两张胶纸在极耳沿第三方向的两侧粘接，能够实现对极耳包覆，从而使得极耳与极片绝缘。但是胶纸被电解液浸泡后，粘性降低，容易使得两张胶纸的粘接处失效分离，造成极耳外露，使得极耳与极片接触短路的风险较大。
本申请中通过使得多个隔膜130的第一超出部131热熔粘接，使得多个隔膜130的第一超出部131形成一体，能够使得多个隔膜130的第一超出部131在被电解液浸泡后分离的可能性较小，从而使得多个隔膜130的第一超出部131能够保持对第一空箔区111和第二极片120的绝缘，进一步减小第一空箔区111与第二极片120接触短路的可能性，使得电芯10的安全性更高。
在一些实施例中，隔膜130制备时，可以将隔膜130的第一超出部131的宽度设置得较大，例如每个隔膜130的第一超出部131的宽度都大于电极组件100的厚度，多个隔膜130的第一超出部131收拢并热熔粘接后，形成连接部，对连接部进行裁切，使得沿第三方向Z，连接部与第一空箔区111之间具有间隙。
在另一些实施例中，也可以在隔膜130制备时，根据每一层130隔膜的第一超出部131所需的宽度进行制备，例如对于位于电极组件100的第二侧的第一隔膜130a，使得第一隔膜130a的第一超出部131的宽度大于或等于电极组件100的厚度，对于位于电极组件100的第一侧的第二隔膜130b，使得第二隔膜130b的第一超出部131的宽度小于第一空箔区111沿第三方向Z与第二极片120的间隔距离，使得多个隔膜130的第一超出部131收拢并热熔粘接后，形成连接部，使得沿第三方向Z，连接部与第一空箔区111之间具有间隙。
在一些实施例中，第一空箔区111位于第一极片110的第一角位，第一缺口121位于第二极片120的第二角位。
通过使得第一空箔区111位于第一极片110的第一角位，第一缺口121位于第二极片120的第二角位，能够便于第一缺口121、第一空箔区111的制备，并且便于第一空箔区111的引出。
本申请中的角位指的是极片顶角处的位置。例如第一角位为第一极片110沿第二方向Y的边缘和第三方向X的边缘形成的角位。
在一些实施例中，第一角位和第二角位为第一极片110的两个相邻的角位。
通过使得第一角位与第二角位为第一极片110的两个相邻的角位，使得第一空箔区111和第二空箔区122能够从电极组件100的同一端引出，便于电芯10通过第一空箔区111和第二空箔区122与外部装置电连接。
在另一些实施例中，第一角位与第二角位可以为第一极片110的两个相对的角位。可以适用于需将第一空箔区111和第二空箔区122从电芯10的相对的两端引出的结构中。
参见如4至图6、图10，图10为图6中电芯的C处的局部放大结构示意图。
在一些实施例中，第二极片120具有位于第三角位的第二空箔区122，第一极片110具有位于第四角位的第二缺口112，沿第一方向X，第二空箔区122与第二缺口112至少部分重叠。
通过使得沿第一方向X，第二空箔区122与第二缺口112至少部分重叠，能够减小第二空箔区122凸出于电极组件100的体积，使得电极组件100和外壳之间预留的用于容置第二空箔区122的间隔空间较小，有利于提高电芯10的能量密度，且在电芯10受外力作用时，电极组件100相对外壳晃动的可能性较小，第二空箔区122与第一极片110接触短路的可能性也较小，能够减小电芯10产生热失控的风险。
通过使得第二空箔区122位于第二极片120的第三角位，第二缺口112位于第一极片110的第四角位，能够便于第二缺口112、第二空箔区122的制备，并且便于第二空箔区122的引出。
在一些实施例中，第二缺口112具有第三边缘1121和第四边缘1122，第三边缘1121与第四边缘1122连接，沿第二方向Y，第二空箔区122超出第三边缘1121。隔膜130具有沿第三方向Z超出第四边缘1122的第二超出部132，多个隔膜130的第二超出部132连接。
通过使得隔膜130具有沿第三方向Z超出第四边缘1122的第二超出部132，多个隔膜130的第二超出部132连接，使得多个隔膜130的第二超出部132能够实现第二空箔区122与第一极片110之间的绝缘，能够使得电芯10受外力作用或跌落时，第二空箔区122与第一极片110接触短路的可能性较低，使得电芯10的安全性较高，并且第二超出部132不会增加电极组件100的厚度，有利于提高电芯10的能量密度。
参见图3和图11，图11为本申请一些实施例提供的电芯的隔膜的结构示意图。
在一些实施例中，隔膜130具有第三缺口133和第四缺口134，沿第一方向X，第一空箔区111与第三缺口133至少部分重叠，第二空箔区122与第四缺口134至少部分重叠。
通过使得隔膜130具有第三缺口133和第四缺口134，沿第一方向X，第一空箔区111与第三缺口133至少部分重叠，第二空箔区122与第四缺口134至少部分重叠，使得第三缺口133可以用于容纳第一空箔区111，第四缺口134可以用于容纳第二空箔区122，能够便于多个第一空箔区111、多个第二空箔区122分别连接。
在一些实施例中，第一缺口121和第二空箔区122位于第二极片120沿第二方向Y的一端，第一缺口121和第二空箔区122沿第三方向Z间隔设置。
通过使得第一缺口121和第二空箔区122位于第二极片120沿第二方向Y的一端，使得第一空箔区111和第二空箔区122能够从电极组件110沿第二方向Y的一端引出，便于电芯10通过第一空箔区111和第二空箔区122与外部装置电连接。第一缺口121和第二空箔区122沿第三方向Z间隔设置，能够减小第一空箔区111与第二极片120、第二空箔区122与第一极片110接触短路的可能性，从而减小电芯10热失控的可能性，提高电芯10的安全性。
在一些实施例中，第三角位和第四角位为第二极片120的两个相邻的角位。
通过使得第三角位和第四角位为第二极片120的两个相邻的角位，使得第一空箔区111和第二空箔区122能够从电极组件100的同一端引出，便于电芯10通过第一空箔区111和第二空箔区122与外部装置电连接。
在另一些实施例中，第三角位和第四角位可以为第二极片120的两个相对的角位。可以适用于需将第一空箔区111和第二空箔区122从电芯10的相对的两端引出的结构中。
在一些实施例中，第一极片110为正极极片，第二极片120为负极极片。
参见图12和图13，图12为本申请另一些实施例提供的电芯的部分结构的一个视角的示意图；图13为本申请另一些实施例提供的电芯的第二极片的结构示意图。
在另一些实施例中，第一缺口121具有第五边缘1213，第五边缘1213与第二边缘1212沿第三方向Z间隔设置，第一边缘1211连接第二边缘1212和第五边缘1213。隔膜130具有沿第三方向Z超出第五边缘1213的第三超出部135，多个隔膜130的第三超出部135连接。
通过使得隔膜130具有沿第三方向Z超出第五边缘1213的第三超出部135，多个隔膜130的第三超出部135连接，使得多个隔膜130的第三超出部135能够实现第一空箔区111与第二极片120之间的绝缘，能够使得电芯10受外力作用或跌落时，第一空箔区111与第二极片120接触短路的可能性较低，使得电芯10的安全性较高，并且第三超出部135不会增加电极组件100的厚度，有利于提高电芯10的能量密度。
参见图1和图2，在一些实施例中，电芯10包括壳体200，壳体200设置有容置空间，电极组件100设置于容置空间。
在一些实施例中，壳体200为包装袋，使得壳体200与电极组件100的安装简单。
在另一些实施例中，壳体200可以为强度较高的材料制成，例如钢铁、铝合金等金属材料，使得壳体200具有较高的受理性能，进而能够使得壳体200不易因受力或环境变化导致变形或破损，进而能够使得电芯10的可靠性更高。壳体200也可以为碳纤维、硬质塑料等强度较高的非金属材料。
电芯包括电极组件100、壳体200和电解液，壳体200用于容纳电极组件100和电解液。电极组件100由正极极片、负极极片和隔膜130组成。电芯10主要依靠金属离子在正极极片和负极极片之间移动来工作。正极极片包括正极集流体和正极活性物质层，正极活性物质层涂覆于正极集流体的表面，未涂覆正极活性物质层的正极集流体的部分作为正极极耳，以通过正极极耳实现正极极片的电能输入或输出。以锂离子电池为例，正极集流体的材料可以为铝，正极活性物质可以为钴酸锂、磷酸铁锂、三元材料或锰酸锂等。负极极片包括负极集流体和负极活性物质层，负极活性物质层涂覆于负极集流体的表面，未涂覆负极活性物质层的负极集流体的部分作为负极极耳，以通过负极极耳实现负极极片的电能输入或输出。负极集流体的材料可以为铜，负极活性物质可以为碳材料或硅材料等。隔离膜的材质可以为聚丙烯(PP)或聚乙烯(PE)等。电解液可以包括有机溶剂、电解质锂盐等。
在一些实施例中，电芯10还包括第一电连接件310，第一电连接件310与第一空箔区111连接，第一电连接件310伸出壳体200。
通过使得第一电连接件310与第一空箔区111连接，第一电连接件310伸出壳体200，能够便于外部设备通过第一电连接件310与电极组件100电连接。
在一些实施例中，电芯10还包括第二电连接件320，第二电连接件320与第二空箔区122连接，第二电连接件320伸出壳体200。
通过使得第二电连接件320与第二空箔区122连接，第二电连接件320伸出壳体200，能够便于外部设备通过第二电连接件320与电极组件100电连接。
在一些实施例中，电芯10还包括第一密封件330，第一密封件330设置于第一电连接件310与壳体200之间。
通过在第一电连接件310与壳体200之间设置第一密封件330，能够使得第一电连接件310与壳体200之间的密封性更好，电芯10的密封性更好。
在一些实施例中，电芯10还包括第二密封件340，第二密封件340设置于第二电连接件320与壳体200之间。
通过在第二电连接件320与壳体200之间设置第二密封件340，能够使得第二电连接件320与壳体200之间的密封性更好，电芯10的密封性更好。
本申请实施例提供一种用电设备，包括以上任一方案的电芯10，电芯10用于为用电设备提供电能。
用电设备可以是前述任一应用电芯10的设备或系统。
需要说明的是，在不冲突的情况下，本申请中的实施例及实施例中的特征可以相互结合。
以上仅为本申请的优选实施例而已，并不用于限制本申请，对于本领域的技术人员来说，本申请可以有各种更改和变化。凡在本申请的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本申请的保护范围之内。

Claims (12)

  1. 一种电芯，其特征在于，包括电极组件，所述电极组件为叠片式结构，所述电极组件包括多个第一极片、多个第二极片以及多个隔膜，所述第一极片与所述第二极片极性相反，多个所述第一极片和多个所述第二极片沿第一方向层叠设置，多个所述隔膜分别设置于所述第一极片和所述第二极片之间；
    每个所述第一极片具有第一空箔区，每个所述第二极片具有第一缺口，沿所述第一方向，所述第一空箔区的至少部分暴露于所述第一缺口；
    所述第一缺口具有第一边缘和第二边缘，所述第一边缘与所述第二边缘连接，沿第二方向，所述第一空箔区超出所述第一边缘；
    所述隔膜具有沿第三方向超出所述第二边缘的第一超出部，多个所述隔膜的所述第一超出部连接，沿所述第一方向观察，所述第一超出部位于所述第一缺口内；
    所述第一方向为所述电极组件的厚度方向，所述第一方向、所述第二方向、所述第三方向两两垂直。
  2. 根据权利要求1所述的电芯，其特征在于，所述电极组件具有沿所述第一方向相对的第一侧和第二侧；
    沿所述第一方向，多个所述隔膜的所述第一超出部朝向所述第一侧收拢并连接。
  3. 根据权利要求2所述的电芯，其特征在于，多个所述隔膜包括位于所述第二侧的第一隔膜，所述第一隔膜的所述第一超出部沿所述第三方向的宽度为W1，所述电极组件的厚度为H1，满足W1≥H1。
  4. 根据权利要求2所述的电芯，其特征在于，多个所述隔膜包括位于所述第二侧的第一隔膜，所述第一隔膜的所述第一超出部沿所述第三方向的宽度为W1，满足W1≥2mm。
  5. 根据权利要求2所述的电芯，其特征在于，多个所述隔膜包括位于所述第一侧的第二隔膜，所述第二隔膜的所述第一超出部沿所述第三方向的宽度为W2，满足W2≥0.2mm。
  6. 根据权利要求1所述的电芯，其特征在于，多个所述隔膜的所述第一超出部连接形成连接部，沿所述第三方向观察，所述连接部与所述第一空箔区之间具有间隙。
  7. 根据权利要求1所述的电芯，其特征在于，多个所述隔膜的所述第一超出部在所述第一方向上向中间收拢并连接。
  8. 根据权利要求1所述的电芯，其特征在于，多个所述隔膜的所述第一超出部热熔粘接。
  9. 根据权利要求1所述的电芯，其特征在于，所述第一空箔区位于所述第一极片的第一角位，所述第一缺口位于所述第二极片的第二角位。
  10. 根据权利要求9所述的电芯，其特征在于，所述第二极片具有位于第三角位的第二空箔区，所述第一极片具有位于第四角位的第二缺口，沿所述第一方向，所述第二空箔区与所述第二缺口至少部分重叠；
    所述第二缺口具有第三边缘和第四边缘，所述第三边缘与所述第四边缘连接，沿所述第二方向，所述第二空箔区超出所述第三边缘；
    所述隔膜具有沿所述第三方向超出所述第四边缘的第二超出部，多个所述隔膜的所述第二超出部连接。
  11. 根据权利要求1所述的电芯，其特征在于，第一缺口具有第五边缘，所述第五边缘与所述第二边缘沿所述第三方向间隔设置，所述第一边缘连接所述第二边缘和所述第五边缘；
    所述隔膜具有沿所述第三方向超出所述第五边缘的第三超出部，多个所述隔膜的所述第三超出部连接。
  12. 一种用电设备，其特征在于，包括如权利要求1-11任一项所述的电芯，所述电芯用于提供电能。
PCT/CN2025/102833 2024-06-26 2025-06-23 电芯及用电设备 Pending WO2026001900A1 (zh)

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