WO2024082091A1 - 电池单体及其制造方法、电池及用电装置 - Google Patents

电池单体及其制造方法、电池及用电装置 Download PDF

Info

Publication number
WO2024082091A1
WO2024082091A1 PCT/CN2022/125655 CN2022125655W WO2024082091A1 WO 2024082091 A1 WO2024082091 A1 WO 2024082091A1 CN 2022125655 W CN2022125655 W CN 2022125655W WO 2024082091 A1 WO2024082091 A1 WO 2024082091A1
Authority
WO
WIPO (PCT)
Prior art keywords
current collecting
insulating
electrode
battery cell
assembly
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.)
Ceased
Application number
PCT/CN2022/125655
Other languages
English (en)
French (fr)
Inventor
孙东升
柴志生
谷慧
迟庆魁
金海族
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.)
Contemporary Amperex Technology Co Ltd
Original Assignee
Contemporary Amperex Technology Co 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 Contemporary Amperex Technology Co Ltd filed Critical Contemporary Amperex Technology Co Ltd
Priority to CN202280086422.8A priority Critical patent/CN118476091A/zh
Priority to PCT/CN2022/125655 priority patent/WO2024082091A1/zh
Priority to EP22962289.9A priority patent/EP4510320A4/en
Publication of WO2024082091A1 publication Critical patent/WO2024082091A1/zh
Priority to US18/944,014 priority patent/US20250070431A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Images

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
    • H01M10/0431—Cells with wound or folded 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
    • H01M10/058—Construction or manufacture
    • H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
    • 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
    • H01M50/107—Primary casings; Jackets or wrappings characterised by their shape or physical structure having curved cross-section, e.g. round or elliptic
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/147—Lids or covers
    • H01M50/148—Lids or covers characterised by their shape
    • H01M50/152—Lids or covers characterised by their shape for cells having curved cross-section, e.g. round or elliptic
    • 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
    • H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
    • H01M50/505—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing comprising a single busbar
    • 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
    • H01M50/536—Electrode connections inside a battery casing characterised by the method of fixing the leads to the electrodes, e.g. by welding
    • 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
    • H01M50/538—Connection of several leads or tabs of wound or folded electrode stacks
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/572—Means for preventing undesired use or discharge
    • H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
    • H01M50/586—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries inside the batteries, e.g. incorrect connections of electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/572—Means for preventing undesired use or discharge
    • H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
    • H01M50/59—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries characterised by the protection means
    • H01M50/593—Spacers; Insulating plates
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Definitions

  • the present application relates to the field of battery technology, and in particular to a battery cell and a manufacturing method thereof, a battery and an electrical device.
  • Lithium-ion batteries have been widely used in electrical devices such as electric vehicles due to their advantages of high energy density, high power density, many cycles and long storage time.
  • the purpose of this application is to optimize the structure of a battery cell.
  • a battery cell comprising:
  • a housing is provided with a first electrode lead-out portion and a second electrode lead-out portion with opposite polarities;
  • An electrode assembly is arranged in the shell, and the electrode assembly includes an electrode body and a first electrode tab and a second electrode tab extending from the same side of the electrode body;
  • the current collecting assembly is arranged on one side of the electrode body close to the first pole ear and the second pole ear.
  • the current collecting assembly includes a first current collecting piece and a second current collecting piece.
  • the first current collecting piece electrically connects the first pole ear and the first electrode lead-out portion
  • the second current collecting piece electrically connects the second pole ear and the second electrode lead-out portion.
  • This embodiment leads the first pole ear and the second pole ear out from the same end of the electrode body, and only needs to reserve electrical connection space at one end of the electrode assembly, and there is no need to set electrode lead-out parts at both ends of the battery cell.
  • the overall energy density of the battery cell can be effectively improved.
  • the capacity of the battery cell is constant, the volume of the battery cell can be reduced, making the battery easier to install in an electrical device with limited height space; or when the volume of the battery cell is constant, the capacity can be increased and the battery life can be extended.
  • At least a portion of the first current collector abuts against a surface of the first tab facing away from the electrode body, and at least a portion of the second current collector abuts against a surface of the second tab facing away from the electrode body.
  • This embodiment facilitates the electrical connection between the first current collector and each layer of the first pole lug in the first pole lug, and the electrical connection between the second current collector and each layer of the second pole lug in the second pole lug, thereby improving the reliability of the electrical connection between the current collector and the corresponding pole lug and improving the current carrying capacity.
  • the housing comprises:
  • An end cap assembly closing the opening, the end cap assembly comprising an end cap body and a first electrode lead-out portion insulated and arranged on the end cap body, and the end cap body serves as a second electrode lead-out portion;
  • the second current collecting member is electrically connected to the end cover body.
  • the first electrode lead-out portion is the electrode terminal
  • the second electrode lead-out portion is the end cap body.
  • One electrode terminal can be omitted, which can simplify the structure of the battery cell, reduce the difficulty of assembly, and save costs. Since only one electrode terminal is required on the end cap body, it is beneficial to increase the cross-sectional area of the electrode terminal to increase the current capacity, and more space can be saved on the end cap body for wiring or arranging heating components.
  • the accommodating portion has a large surface area, which can improve the current capacity and is also convenient for welding with the second current collector.
  • end cap body as the second electrode lead-out portion, compared with the side wall of the accommodating portion as the second lead-out portion, can avoid the current collector occupying the space between adjacent battery cells, which is beneficial to reduce the spacing between adjacent battery cells, and can make the layout of multiple battery cells in the battery more compact, thereby improving the energy density of the battery.
  • the current collecting assembly further includes an insulating base, and the first current collecting piece and the second current collecting piece are connected to the insulating base and are insulated from each other by the insulating base.
  • the current collector assembly in this embodiment adopts an integral structure, which simplifies the electrical connection structure inside the battery cell, can further save the internal space of the battery cell, reduce weight, and save the production cost of parts; the first current collector and the second current collector are supported by the insulating substrate, which can improve the overall rigidity, not easy to deform, and stable installation, thereby improving the reliability of electrical connection. Moreover, this design can also reduce the difficulty of assembly. There is no need to install the first current collector, the second current collector and the insulating substrate separately. It has more obvious advantages for battery cells with smaller cross-sectional dimensions and can improve assembly efficiency.
  • the first current collector and the second current collector are insulated from each other through the insulating substrate integrated with them, which can improve the insulation reliability and reduce the impact of assembly errors or vibrations on insulation performance, thereby improving the reliability and safety of the battery cell.
  • the first current collecting member, the second current collecting member and the insulating substrate are integrally injection molded.
  • This embodiment can reduce the difficulty of processing and assembling the components in the current collecting assembly through one-piece injection molding, thereby improving the production efficiency of the battery cell, and is convenient for setting a concave-convex matching structure between the first current collecting member and the second current collecting member and the insulating substrate to increase the bonding strength with the insulating substrate, thereby improving the firmness of the first current collecting member and the second current collecting member to the insulating substrate.
  • the insulating base includes a first insulating portion, the first insulating portion has a first opening and a second opening, at least a portion of the first current collecting member is accommodated in the first opening, and at least a portion of the second current collecting member is accommodated in the second opening;
  • a portion of the first insulating portion is located between the first opening and the second opening and is used to separate the first current collecting member from the second current collecting member.
  • This embodiment can better connect the current collector to the insulating substrate and achieve reliable fixation by accommodating at least part of the first current collector in the first opening and accommodating at least part of the second current collector in the second opening, and can reduce the size of the battery cell in the height direction, thereby reducing the volume of the battery cell and improving the energy density.
  • part of the first insulating portion is located between the first opening and the second opening, which can insulate the first current collector and the second current collector, thereby improving insulation reliability.
  • a second groove is provided on the inner side wall of the first opening, a protrusion is provided on the outer side wall of the first current collecting member that matches the first opening, and the protrusion is embedded in the second groove to combine the first current collecting member with the insulating substrate;
  • a second groove is arranged on the inner side wall of the second opening, and a protrusion is arranged on the outer side wall of the second current collecting member matching with the second opening, and the protrusion is embedded in the second groove to combine the second current collecting member with the insulating substrate.
  • This embodiment can better connect the current collector to the insulating substrate and achieve reliable fixation by accommodating at least part of the first current collector in the first opening and accommodating at least part of the second current collector in the second opening, and can reduce the size of the battery cell in the height direction, thereby reducing the volume of the battery cell and improving the energy density.
  • part of the first insulating portion is located between the first opening and the second opening, which can insulate the first current collector and the second current collector, thereby improving insulation reliability.
  • a first through hole is provided on the protrusion, a limiting column is provided on the insulating substrate, and the limiting column is embedded in the first through hole.
  • This embodiment provides a first through hole on the protrusion, which can further increase the bonding force between the current collecting member and the insulating substrate when the insulating substrate, the first current collecting member and the second current collecting member are injection molded, so that the first current collecting member and the second current collecting member are more firmly fixed to the insulating substrate.
  • the battery cell further includes: an insulating sheet disposed between the second current collecting member and the first electrode lead-out portion.
  • This embodiment uses an insulating sheet to separate the second current collector and the first electrode lead-out portion with opposite polarities, which can ensure insulation performance and prevent short circuits, thereby improving the reliability and safety of the battery cell operation.
  • the battery cell further includes: a spacer disposed between the first current collector and the first electrode lead-out portion, wherein the spacer and the insulating sheet are each flush with a surface facing the end cap assembly and not lower than a surface of the first insulating portion.
  • This embodiment provides a spacer and makes the spacer and the insulating sheet flush with each other, so that the end cap assembly and the current collecting assembly can be in balanced contact, which is beneficial to improving the overall structural rigidity and making the current collecting assembly evenly stressed. It can prevent the current collecting assembly from being displaced or deformed when subjected to vibration or impact, ensure the stability of the electrical connection, and thus improve the reliability and safety of the battery cell operation.
  • an edge of the first current collecting member adjacent to the receiving portion is surrounded by an insulating matrix.
  • This embodiment surrounds the edge of the first current collector close to the accommodating portion by an insulating substrate, which can ensure reliable insulation between the first current collector and the accommodating portion. Even when the battery cell is subjected to vibration or impact, the first current collector and the accommodating portion cannot directly contact each other, which can prevent the first current collector and the accommodating portion of different polarities from short-circuiting, thereby improving the reliability and safety of the battery cell operation.
  • the end cap assembly further includes a first insulating member disposed between the end cap body and the current collecting assembly, and an end surface of the first insulating member closest to the electrode assembly is flush with an end surface of the first electrode lead-out portion closest to the electrode assembly.
  • This embodiment can provide support for the first insulating member and the first electrode lead-out portion simultaneously through the current collecting assembly, thereby improving the stability of the overall structure, maintaining the position of the first electrode lead-out portion stable, and reducing the deformation of the current collecting assembly, thereby improving the reliability of the internal electrical connection of the battery cell.
  • the insulating base includes a first insulating portion and a second insulating portion connected to the first insulating portion, the first insulating portion has a first opening, and the first current collecting member includes:
  • a first portion matched with the first opening and electrically connected to the first tab
  • the second portion is connected to the first portion and overlapped with the second insulating portion, and the second portion is electrically connected to the first electrode lead portion.
  • the first current collector in this embodiment includes a first part and a second part, which can enable the first pole ear and the first electrode lead-out part to be respectively connected to different areas on the first current collector, thereby preventing the first current collector from being deformed and damaged due to repeated welding, and improving the welding reliability; moreover, the second part is overlapped on the second insulating part, which can provide stable support for the second part and prevent the second part from being deformed; in addition, by setting the second insulating part, insulation between the first current collector and the second pole ear can be achieved, thereby improving the insulation reliability and preventing the battery cell from short-circuiting during operation.
  • the first electrode lead-out portion is disposed in a central region of the end cap body, and the second insulating portion is disposed in a central region of the first insulating portion.
  • This embodiment arranges the first electrode lead-out portion in the central area of the end cover body, which is beneficial to increasing the cross-sectional area of the first electrode lead-out portion, which not only facilitates electrical connection but also improves the current carrying capacity; moreover, it is convenient to connect the first electrode lead-out portion of a battery cell and the second electrode lead-out portion of an adjacent battery cell through a busbar, which is beneficial to increasing the width of the busbar and improving the current carrying capacity.
  • projections of the first electrode lead portion and the second current collecting member in a cross section of the accommodating portion have an overlapping area, the second insulating portion protrudes toward the first electrode lead portion relative to the first insulating portion, and the second portion protrudes toward the first electrode lead portion relative to the first portion.
  • This embodiment takes into account that when the first electrode lead-out portion and the second current collector have an overlapping area, in order to achieve electrical connection between the second portion and the first electrode lead-out portion, the second portion is close to the second current collector and a short circuit is prone to occur.
  • the second insulating portion protrude toward the first electrode lead-out portion relative to the first insulating portion, the second portion can be staggered in height from the portion where the second current collector is connected to the second pole tab, thereby preventing a short circuit between the second portion and the second current collector and improving insulation reliability.
  • a first groove is disposed on an inner end surface of the first electrode lead-out portion, and at least a portion of the second portion is located in the first groove.
  • a first groove is provided on the inner end surface of the first electrode lead-out portion, and at least part of the second portion is located in the first groove, which can reduce the occupied height of the current collecting assembly, thereby reducing the height of the battery cell.
  • this structure can provide support for the first insulating member and the first electrode lead-out portion through the current collecting assembly, thereby improving the stability of the overall structure, maintaining the position of the first electrode lead-out portion stable, and thus improving the reliability of the internal electrical connection of the battery cell.
  • the end cap assembly also includes a first insulating member, which is disposed between the end cap body and the current collecting assembly, covers the radially outer area of the inner end surface of the first electrode lead-out portion, and forms a first groove with the inner end surface of the first electrode lead-out portion, and at least a portion of the second portion is located in the first groove.
  • This embodiment does not need to process the first groove on the inner end face of the first electrode lead-out portion, which can reduce the difficulty of processing the first electrode lead-out portion.
  • the current collecting assembly only needs to provide support for the first insulating member, and there is no need to consider the alignment between the end face of the first insulating member closest to the electrode assembly and the end face of the first electrode lead-out portion closest to the electrode assembly, which can reduce the requirements for the processing accuracy of parts.
  • the depth of the first groove does not exceed the protrusion height of the second portion relative to the first portion.
  • This embodiment can ensure that the second part is in reliable contact with the bottom of the first groove even when there is a processing error in the first groove or an error in the protruding height of the second part relative to the first part, thereby avoiding an assembly gap between the second part and the first electrode lead-out part, and ensuring the reliability of the electrical connection between the first electrode lead-out part and the second part.
  • a sidewall of the second insulating portion outside the first opening exceeds an outer sidewall of the second portion.
  • This embodiment enables the side wall of the second insulating part to extend beyond the outer side wall of the second part, thereby isolating the second part from the second current collector and avoiding contact between the second part and the second current collector, thereby ensuring insulation reliability and improving the reliability and safety of the battery cell operation.
  • At least one corner of the first portion away from the second portion is provided with a first notch, which is configured to cooperate with a first positioning portion in the injection mold to achieve positioning of the first current collecting member.
  • This embodiment can position the first current collecting part through the first notch when the current collecting assembly is formed by injection molding, so as to improve the position accuracy of the first current collecting part; and, since the circumferential dimension of the inner edge of the first current collecting part is relatively small, which is the bottleneck area of the flow area, the first notch is arranged at the corner of the first part away from the second part, which does not affect the flow capacity of the first current collecting part.
  • the insulating substrate includes a first insulating portion, the first insulating portion has a second opening, and the second current collecting member includes:
  • the fourth portion is at least partially connected to the edge of the third portion close to the accommodating portion, and the fourth portion is electrically connected to the end cover body.
  • the second current collecting member of this embodiment is easy to process and can be conveniently electrically connected to the end cover body directly or indirectly through the fourth part after being integrated with the insulating substrate, thereby achieving electrical connection between the second electrode tab and the end cover body serving as the second electrode lead-out portion.
  • At least one corner of the third portion away from the fourth portion is provided with a second notch, which is configured to cooperate with a second positioning portion in the injection mold to achieve positioning of the second current collecting member.
  • This embodiment can position the second current collecting part through the second notch when the current collecting assembly is formed by injection molding, so as to improve the position accuracy of the second current collecting part; and, since the outer edge of the second current collecting part is provided with a bent fourth part, the second notch is arranged at the corner of the third part away from the fourth part, which facilitates the processing of the second notch and also facilitates the positioning of the second current collecting part.
  • an extension length of the fourth portion in the circumferential direction of the receiving portion does not exceed an edge of the third portion close to the receiving portion.
  • This embodiment can reduce the difficulty of processing the second current collecting member, and can be directly formed by bending a thin plate structure, thereby improving the overall structural strength of the second current collecting member and improving the connection reliability between the third part and the fourth part.
  • the fourth portion extends along the entire circumference of the receiving portion.
  • This embodiment allows the fourth portion to extend along the entire circumference of the accommodating portion, which can increase the length of the direct or indirect electrical connection between the fourth portion and the end cover body, improve connection reliability, and increase current flow capacity.
  • the fourth portion is disposed at an angle to the third portion.
  • the fourth part is arranged at an angle with the third part, which can increase the area of electrical connection between the fourth part and the side wall of the accommodating part or the end cover body, facilitate electrical connection by welding, and improve electrical connection reliability.
  • the fourth portion extends toward a direction approaching the end cap assembly.
  • This embodiment allows the fourth part to extend in a direction away from the electrode assembly, which can prevent the fourth part from being inserted between the pole pieces of the electrode assembly under vibration or impact and causing the active material to fall off. It can also prevent the fourth part from contacting the pole pieces with opposite polarity and causing a short circuit, thereby improving insulation reliability. Moreover, the fourth part is closer to the opening of the accommodating portion, which makes it more convenient to weld the fourth part to the side wall of the accommodating portion from the opening, thereby improving the welding quality.
  • the accommodating portion has a side wall
  • the end cap assembly further includes a first insulating member, which is disposed between the end cap body and the current collecting assembly. There is a first gap between the first insulating member and the side wall at least in an area corresponding to the fourth portion, and the fourth portion is located in the first gap.
  • This embodiment positions the fourth portion in the first gap between the first insulating member and the accommodating portion, and can share space with the first insulating member.
  • the inner side of the fourth portion is insulated by the first insulating member.
  • the fourth portion can be prevented from being inserted between the pole pieces of the electrode assembly under vibration or impact to cause the active material to fall off, and can also be prevented from contacting the pole pieces with opposite polarities to cause a short circuit, thereby improving insulation reliability.
  • the fourth portion is closer to the opening of the accommodating portion, and it is more convenient to weld the fourth portion to the side wall of the accommodating portion from the opening. When welding is used, the fourth portion and the side wall can be welded from the inside of the accommodating portion, thereby improving welding quality, or facilitating direct electrical connection of the fourth portion to the end cover body.
  • the shell is cylindrical
  • the first insulating member is annular
  • the outer diameter of the first insulating member is d
  • the outer diameter of the end cover body is D
  • the thickness of the fourth portion is ⁇
  • the outer wall of the first insulating member is configured as a circumferential surface for easy processing. Furthermore, when assembling the end cover assembly where the first insulating member is located, it is not necessary to circumferentially align the first insulating member with the fourth part, thereby facilitating assembly and improving assembly efficiency.
  • the receiving portion has a side wall, and the second current collecting member is electrically connected to the end cover body through the side wall.
  • the second current collecting member is electrically connected to the end cover body through the side wall, which can reduce the requirement for the length of the outer end connection portion of the second current collecting member and the requirement for the structure of the end cover body.
  • the end cover body can be designed as a flat plate structure without considering the connection with the second current collecting member, which can simplify the structure of the end cover body and reduce the manufacturing difficulty.
  • the end cover body has a bending portion, which protrudes toward the inner side of the end cover body and is arranged close to the accommodating portion, and the second current collecting member is electrically connected to the bending portion.
  • This embodiment electrically connects the second current collector to the end cover body through the bending portion, which can increase the contact area between the second current collector and the end cover body. For example, when welding is used to achieve electrical connection, it can improve the connection reliability and increase the contact area.
  • this structure is also suitable for the case where the housing part and the end cover body are insulated, or when the weld between the end cover body and the housing part falls off, the second current collector can also reliably output electrical energy to the end cover body. In addition, it can also solve the problem that the thin housing part and the end cover body affect the flow capacity.
  • a second gap is provided between the bent portion and the accommodating portion, and an outer end of the second current collecting member is located in the second gap.
  • This embodiment makes the second current collecting member contact the side wall of the bending portion toward the accommodating portion, which facilitates electrical connection by welding, and is also beneficial to increasing the area of electrical connection between the second current collecting member and the bending portion, improving the reliability of electrical connection, and maintaining the stability of the position of the second current collecting member.
  • the first electrode tab and the second electrode tab are spaced apart along the circumference of the electrode assembly.
  • the arrangement of the first pole ear and the second pole ear in this embodiment can not only better separate the pole ears of different polarities in space, but also allow the electrolyte to penetrate into the interior of the electrode body through the spacing area, so that the electrolyte and the active material on the pole piece can fully react during the charge and discharge process of the battery cell.
  • the shape of the connecting portion between the first current collector and the first pole tab is the same as the shape of the end surface of the first pole tab; and/or the shape of the connecting portion between the second current collector and the second pole tab is the same as the shape of the end surface of the second pole tab.
  • This embodiment is conducive to enabling the entire end surface of the first pole lug and/or the second pole lug to be electrically connected to the corresponding current collecting member, thereby ensuring the current transmission capability; on this basis, it can also reduce the redundant area of the current collecting member and save materials.
  • the portion of the first current collector connected to the first electrode tab covers the first electrode tab; and/or the portion of the second current collector connected to the second electrode tab covers the second electrode tab.
  • This embodiment enables the entire end surface of the first pole tab and/or the second pole tab to be electrically connected to the corresponding current collecting member, thereby ensuring the current transmission capability.
  • the electrode assembly is in a wound structure, and at least one of the first electrode tab and the second electrode tab has a gradually increasing width from the center to the outside along the radial direction of the wound structure.
  • This embodiment can make the spacing between the first pole lugs of each group of adjacent layers in the first pole lugs evenly distributed, or make the spacing between the second pole lugs of each group of adjacent layers in the second pole lugs evenly distributed; moreover, by increasing the width of the pole lugs in the outer layer region along the winding direction, the effective contact area when the pole lugs are connected to the current collector can be increased, which can increase the current flow capacity, thereby improving the performance of the battery cell.
  • a battery comprising the battery cell of the above embodiment.
  • the battery further includes a busbar, a first end of the busbar is connected to a first electrode lead-out portion of one of the battery cells, and a second end of the busbar is connected to a second electrode lead-out portion of another battery cell.
  • This embodiment can conveniently realize the electrical connection of multiple battery cells.
  • the housing comprises:
  • An end cap assembly closing the opening, the end cap assembly comprising an end cap body and a first electrode lead-out portion insulated and arranged on the end cap body;
  • the second end of the current collector is connected to the end cover body.
  • This embodiment can conveniently realize the electrical connection of multiple battery cells, allowing the layout of multiple battery cells to be more compact, and is conducive to increasing the width of the busbar and improving the current carrying capacity.
  • an electrical device comprising the battery cell and/or battery of the above-mentioned embodiment, for providing electrical energy to the electrical device.
  • a method for manufacturing a battery cell comprising the following steps:
  • Providing a shell providing a shell, wherein the shell is provided with a first electrode lead-out portion and a second electrode lead-out portion with opposite polarities;
  • Assembling electrodes providing an electrode assembly and placing it in a housing, wherein the electrode assembly comprises an electrode body, a first electrode tab and a second electrode tab, wherein the first electrode tab and the second electrode tab are led out from the same side of the electrode body; and
  • the current collecting assembly is arranged on one side of the electrode body close to the first pole ear and the second pole ear, and the current collecting assembly includes a first current collecting member and a second current collecting member, and the first pole ear and the first electrode lead-out portion are electrically connected through the first current collecting member, and the second pole ear and the second electrode lead-out portion are electrically connected through the second current collecting member.
  • the housing includes a receiving portion and an end cap assembly, the receiving portion has an opening, the end cap assembly closes the opening, the end cap assembly includes an end cap body and a first electrode lead-out portion insulated and disposed on the end cap body, the end cap body serving as a second electrode lead-out portion;
  • the electrical connection step includes:
  • the end cover body closes the opening
  • the first current collecting member and the first electrode lead-out portion are welded from the outside of the end cap assembly.
  • the receiving portion has a side wall, the receiving portion is electrically connected to the end cover body, and the step of electrically connecting the second current collecting member to the end cover body comprises:
  • the second current collecting member is electrically connected to the side wall, and the side wall is electrically connected to the end cover body.
  • the second current collecting member is welded to the side wall from the inner side of the receiving portion.
  • the second current collector includes: a third portion electrically connected to the second electrode tab; and a fourth portion at least connected to an edge of the third portion close to the accommodating portion, and the fourth portion is electrically connected to the side wall; the manufacturing method further includes:
  • an obtuse angle is formed between the fourth portion and the third portion.
  • FIG. 1 is a schematic diagram of the structure of some embodiments of the present application for installing a battery on a vehicle.
  • FIG. 2 is an exploded view of the first embodiment of the battery of the present application.
  • FIG. 3 is an appearance diagram of some embodiments of the battery cell of the present application.
  • FIG. 4 is an exploded view of a first embodiment of a battery cell of the present application.
  • FIG. 5 is a cross-sectional view of a first embodiment of a battery cell of the present application.
  • FIG. 6 is a schematic structural diagram of some embodiments of the end cover assembly in FIG. 5 .
  • FIG7 and FIG8 are enlarged views of point A and point B in FIG5 , respectively.
  • FIG. 9 is a schematic structural diagram of some embodiments of the current collecting assembly in FIG. 4 .
  • FIG. 10 is an exploded view of the current collecting assembly shown in FIG. 9 .
  • 11A and 11B are respectively a front view and a C-C cross-sectional view of the current collecting assembly in FIG4 .
  • 12A and 12B are respectively a front view and a D-D cross-sectional view of the first current collecting member in FIG. 4 .
  • 13A and 13B are respectively a front view and an E-E cross-sectional view of the second current collecting member in FIG. 4 .
  • FIG. 14 is a cross-sectional view of the current collecting assembly in FIG. 4 .
  • FIG. 15 is an exploded view of a second embodiment of a battery cell of the present application.
  • FIG. 16 is a schematic structural diagram of some embodiments of the current collecting assembly in FIG. 15 .
  • FIG17 is a cross-sectional view taken along the line F-F in FIG16 .
  • FIG. 18 is a cross-sectional view of a second embodiment of a battery cell of the present application.
  • FIG19 is an enlarged view of point G in FIG18 .
  • FIG. 20 is a cross-sectional view of the first insulating member in FIG. 15 .
  • FIG. 21 is a schematic diagram of the structure of some embodiments of electrical connection of multiple battery cells in a battery.
  • End cap assembly 21. End cap body; 211. Second through hole; 212. Bend portion; 22. First electrode lead-out portion; 221. First section; 222. Second section; 223. Third section; 224. First groove; 225. Second groove; 226. Third groove; 227. Liquid injection hole; 23. First insulating member; 231. Fourth groove; 232. Fifth groove; 233. Ring portion; 234. First extension portion; 235. Second extension portion; 24. Sealing member; 25. Second insulating member; 26. Sealing cover;
  • electrode assembly 31. electrode body; 311. center hole; 32. first pole ear; 33. second pole ear;
  • 200 battery; 201, box assembly; 201A, main body; 201B, first cover; 201C, second cover; 202, busbar;
  • multiple refers to more than two (including two).
  • multiple groups refers to more than two groups (including two groups), and “multiple pieces” refers to more than two pieces (including two pieces).
  • the battery cell may include a lithium-ion secondary battery, a lithium-ion primary battery, a lithium-sulfur battery, a sodium-lithium-ion battery, a sodium-ion battery or a magnesium-ion battery, etc., which is not limited in the embodiments of the present application.
  • the battery cell may be cylindrical, flat, rectangular or other shapes, etc., which is not limited in the embodiments of the present application. Battery cells are generally divided into three types according to the packaging method: cylindrical battery cells, square battery cells and soft-pack battery cells, which is not limited in the embodiments of the present application.
  • the current battery cell usually includes a shell and an electrode assembly contained in the shell, and the shell is filled with electrolyte.
  • the electrode assembly is mainly formed by stacking or winding a first pole sheet and a second pole sheet with opposite polarities, and an insulating member such as a diaphragm is usually provided between the first pole sheet and the second pole sheet.
  • the portion of the first pole sheet and the second pole sheet coated with active materials constitutes the main body of the electrode assembly, and the portion of the first pole sheet and the second pole sheet not coated with active materials each constitutes a first pole ear and a second pole ear.
  • the first pole sheet can be a positive pole sheet, including a positive current collector and a positive active material layer provided on both sides of the positive current collector, the material of the positive current collector can be, for example, aluminum, and the positive active material can be, for example, lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganese oxide;
  • the second pole sheet can be a negative pole sheet, including a negative current collector and a negative active material layer provided on both sides of the negative current collector, the material of the negative current collector can be, for example, copper, and the negative active material can be, for example, graphite or silicon.
  • the first pole sheet can also be a negative pole sheet, and the corresponding second pole sheet is a positive pole sheet.
  • the first tab and the second tab may be located at one end of the main body or at two ends of the main body.
  • the inventors have found through research that current battery cells are usually provided with a first electrode lead-out portion and a second electrode lead-out portion with opposite polarities, which are used to connect to the power circuit for power supply, and the first pole lug is electrically connected to the first electrode lead-out portion, and the second pole lug is electrically connected to the second electrode lead-out portion.
  • first electrode lead-out portion and the second electrode lead-out portion are respectively arranged at both ends of the battery cell, and accordingly, the first pole lug and the second pole lug are respectively led out from the two ends of the electrode assembly.
  • the inventors have found that the pole lugs and electrode terminals at each end will occupy a certain space for electrical connection, and more space needs to be consumed in the height direction of the battery cell, resulting in an increase in the overall volume of the battery cell and affecting the overall energy density of the battery cell.
  • the inventors want to optimize the internal structure of the battery cell and mainly improve the lead-out method of the tabs to reduce the height of the battery cell, thereby increasing the energy density.
  • an embodiment of the present application proposes a battery cell, which includes a shell, provided with a first electrode lead-out portion and a second electrode lead-out portion with opposite polarities; an electrode assembly, arranged in the shell, the electrode assembly includes an electrode body and a first pole ear and a second pole ear led out from the same side of the electrode body; a current collecting assembly, arranged on a side of the electrode assembly close to the first pole ear and the second pole ear, the current collecting assembly includes a first current collecting member and a second current collecting member, the first current collecting member electrically connecting the first pole ear and the first electrode lead-out portion, and the second current collecting member electrically connecting the second pole ear and the second electrode lead-out portion.
  • This type of battery cell leads the first pole ear and the second pole ear out from the same side of the electrode body, and leads the first pole ear and the second pole ear out from the same end of the electrode body. It only needs to reserve electrical connection space at one end of the electrode assembly, and there is no need to set electrode lead-out parts at both ends of the battery cell respectively.
  • the overall energy density of the battery cell can be effectively improved.
  • the capacity of the battery cell is constant, the volume of the battery cell can be reduced, making the battery easier to install in an electrical device with limited height space; or when the volume of the battery cell is constant, the capacity can be increased and the battery life can be extended.
  • the battery cell of the embodiment of the present application is applicable to a battery and an electrical device using the battery cell, and the battery is also applicable to the electrical device.
  • the battery of the embodiment of the present application can be used in an electrical device.
  • the electrical device can be a battery car, an electric car, a ship or a spacecraft, etc.
  • the spacecraft includes an airplane, a rocket, a space shuttle and a spacecraft, etc.
  • the power-consuming device may be a vehicle 300, such as a new energy vehicle, which may be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, etc.; or the power-consuming device may be a drone or a ship, etc.
  • the vehicle 300 may include an axle 301, a wheel 302 connected to the axle 301, a motor 303, a controller 304, and a battery 200.
  • the motor 303 is used to drive the axle 301 to rotate
  • the controller 304 is used to control the operation of the motor 303
  • the battery 200 may be arranged at the bottom, head, or tail of the vehicle 300 to provide power for the operation of the motor 303 and other components in the vehicle.
  • the battery 200 includes a box assembly 201 and a battery cell 100.
  • the battery cell 100 may be one or more. If there are multiple battery cells 100, the multiple battery cells 100 may be connected in series, in parallel, or in mixed connection. Mixed connection means that multiple battery cells 100 are both connected in series and in parallel. Multiple battery cells 100 may be connected in series, in parallel, or in mixed connection to form a battery module, and multiple battery modules may be connected in series, in parallel, or in mixed connection to form a whole, and accommodated in the box assembly 201. Alternatively, all battery cells 100 may be directly connected in series, in parallel, or in mixed connection, and then the whole formed by all battery cells 100 may be accommodated in the box assembly 201.
  • the box assembly 201 can be a part of the battery pack, and the box assembly 201 can be detachably installed on the electrical device; or, the box assembly 201 can also be a space formed by a structural member in the electrical device for accommodating the battery cell 100.
  • the box assembly 201 is a space formed by the frame for accommodating the battery cell 100.
  • the box assembly 201 is hollow inside and is used to accommodate one or more battery cells 100.
  • the box assembly 201 may also have different shapes and sizes according to the shape, quantity, combination and other requirements of the battery cells 100 accommodated.
  • the box assembly 201 may include: a main body 201A, a first cover 201B and a second cover 201C. Both opposite ends of the main body 201A have openings. The first cover 201B and the second cover 201C are used to close the openings at both ends of the main body 201A.
  • the main body 201A is a rectangular cylindrical structure.
  • FIG3 is a schematic diagram of the appearance of some embodiments of a battery cell 100.
  • the battery cell 100 includes a housing 10, which may include a housing 1 and an end cap assembly 2.
  • the housing 1 has an opening, and the end cap assembly 2 closes the opening and is connected to the housing 1 to form the housing 10.
  • the end cap assembly 2 includes an end cap body 21 and a first electrode lead-out portion 22, and the first electrode lead-out portion 22 is provided on the end cap body 21.
  • FIG3 illustrates a cylindrical battery cell 100, and the subsequent embodiments are also mainly described by taking the cylindrical battery cell 100 as an example.
  • the battery cell 100 of the present application may also be a flat body, a rectangular parallelepiped, or other shapes.
  • FIG4 is an exploded view of the first embodiment of the battery cell 100
  • FIG5 is a longitudinal cross-sectional view of the battery cell 100
  • the battery cell 100 includes: a housing 10, an electrode assembly 3, and a current collecting assembly 4.
  • the housing 10 is provided with a first electrode lead-out portion 22 and a second electrode lead-out portion with opposite polarities
  • the electrode assembly 3 is arranged in the housing 10, and the electrode assembly 3 includes an electrode body 31 and a first pole tab 32 and a second pole tab 33 led from the same side of the electrode body 31
  • the current collecting assembly 4 is arranged on a side of the electrode body 31 close to the first pole tab 32 and the second pole tab 33
  • the current collecting assembly 4 includes a first current collecting member 42 and a second current collecting member 43, the first current collecting member 42 electrically connects the first pole tab 32 and the first electrode lead-out portion 22, and the second current collecting member 43 electrically connects the second pole tab 33 and the second electrode lead-out portion.
  • the housing 10 is a hollow structure for accommodating the electrode assembly 3, and the housing 10 is filled with electrolyte.
  • the first electrode lead-out portion 22 and the second electrode lead-out portion are used to input or output electrical energy, the first electrode tab 32 is electrically connected to the first electrode lead-out portion 22 through the first current collector 42, and the second electrode tab 33 is electrically connected to the second electrode lead-out portion through the second current collector 43.
  • both the first electrode lead-out portion 22 and the second electrode lead-out portion can be electrode terminals.
  • the electrode terminal can be designed as a pole, and the pole can be a cylindrical, square columnar structure, or a columnar structure of other shapes.
  • the first electrode lead-out portion 22 and the second electrode lead-out portion are both insulated from the shell 10.
  • the first electrode lead-out portion 22 is a positive terminal and the second electrode lead-out portion is a negative terminal; or the first electrode lead-out portion 22 is a negative terminal and the second electrode lead-out portion is a positive terminal.
  • at least part of the first electrode lead-out portion 22 and/or the second electrode lead-out portion protrudes from the outer wall of the shell 10 to facilitate electrical connection between different battery cells 100 through a busbar.
  • the first electrode lead-out portion 22 is an electrode terminal
  • the second electrode lead-out portion is an end cap body 21 of the housing 10.
  • the end cap body 21 may be provided with a second through hole 211, and the electrode terminal is installed in the second through hole 211.
  • the first electrode lead-out portion 22 is used to lead out the positive electrode power of the electrode assembly 3, and the second electrode lead-out portion is used to lead out the negative electrode power of the electrode assembly 3; or the first electrode lead-out portion 22 is used to lead out the negative electrode power of the electrode assembly 3, and the second electrode lead-out portion is used to lead out the positive electrode power of the electrode assembly 3.
  • the electrode assembly 3 includes a first pole piece and a second pole piece with opposite polarities, and the first pole piece and the second pole piece can be formed by winding around a winding axis K.
  • the electrode assembly 3 is cylindrical; for a square battery cell 100, the electrode assembly 3 is flat.
  • the first pole tab 32 and the second pole tab 33 are located at the same end of the electrode assembly 3 along the winding axis K, and are arranged close to the electrode terminals in the first electrode lead-out portion 22 and the second electrode lead-out portion.
  • the first pole tab 32 is a positive pole tab
  • the second pole tab 33 is a negative pole tab
  • the first pole tab 32 is a negative pole tab
  • the second pole tab 33 is a positive pole tab.
  • the current collecting assembly 4 is arranged between the pole ear and the wall of the shell 10 facing the pole ear, and is used to realize the electrical connection between the pole ear and the electrode lead-out portion of the same polarity.
  • the first current collecting member 42 and the second current collecting member 43 can be made of conductive materials, such as metal materials, the positive current collecting member can be made of aluminum material, and the negative current collecting member can be made of copper material.
  • the current collecting member and the corresponding pole ear are made of the same material to facilitate welding and reduce welding cracks.
  • the first pole ear 32 and the second pole ear 33 are led out from the same end of the electrode body 31. Only electrical connection space needs to be reserved at one end of the electrode assembly 3, and there is no need to set electrode lead-out parts at both ends of the battery cell 100. This can effectively improve the overall energy density of the battery cell 100.
  • the capacity of the battery cell 100 is constant, the volume of the battery cell 100 can be reduced, making it easier for the battery 200 to be installed in an electrical device with limited height space; or when the volume of the battery cell 100 is constant, the capacity can be increased and the battery life of the battery 200 can be extended.
  • At least a portion of the first current collector 42 abuts against a surface of the first electrode tab 32 facing away from the electrode body 31
  • at least a portion of the second current collector 43 abuts against a surface of the second electrode tab 33 facing away from the electrode body 31 .
  • the surface of the first pole tab 32 away from the electrode body 31 is a surface formed by the outer ends of the multiple first pole tabs. In order to improve the reliability of the electrical connection between the first current collector 42 and the first pole tab 32, the outer end of the first pole tab 32 can be flattened to increase the contact area.
  • the surface of the second pole tab 33 away from the electrode body 31 is a surface formed by the outer ends of the multiple second pole tabs. In order to improve the reliability of the electrical connection between the second current collector 43 and the second pole tab 33, the outer end of the second pole tab 33 can be flattened to increase the contact area.
  • This embodiment facilitates the first current collector 42 to be electrically connected to each layer of the first pole lug portion in the first pole lug 32, and the second current collector 43 to be electrically connected to each layer of the second pole lug portion in the second pole lug 33, thereby improving the reliability of the electrical connection between the current collector and the corresponding pole lug and improving the current flow capacity.
  • the shell 10 includes a accommodating portion 1 and an end cover assembly 2, the accommodating portion 1 has an opening 111, the end cover assembly 2 closes the opening 111, and the end cover assembly 2 includes an end cover body 21 and a first electrode lead-out portion 22 insulated and arranged on the end cover body 21, and the end cover body 21 serves as a second electrode lead-out portion; wherein the second current collecting member 43 is electrically connected to the end cover body 21.
  • the end cap body 21 is provided with a second through hole 211, and the first electrode lead-out portion 22 is provided in the second through hole 211.
  • the first electrode lead-out portion 22 may be provided in the central area of the end cap body 21, or may be provided offset from the center of the end cap body 21.
  • the end cap assembly 2 further includes: a sealing member 24 and a second insulating member 25, which together surround the inner wall of the second through hole 211 and the area of the end cap body 21 adjacent to the second through hole 211.
  • the sealing member 24 may be made of rubber material, and the second insulating member 25 may be made of plastic material.
  • the sealing member 24 and the second insulating member 25 are both annular, and their cross sections are both L-shaped. As shown in FIG6 , the transverse portion of the sealing member 24 is in contact with the inner wall of the end cover body 21, and the vertical portion extends into the second through hole 211 and is in contact with the side wall of the second through hole 211; the transverse portion of the second insulating member 25 is in contact with the outer wall of the end cover body 21, and the vertical portion extends into the second through hole 211 and is in contact with the side wall of the second through hole 211, and the vertical portions of the sealing member 24 and the second insulating member 25 are in contact with each other.
  • the sealing member 24 and the second insulating member 25 are both annular.
  • the end cap body 21 is made of metal material, and it is used as the second electrode lead-out portion, which can save an electrode terminal.
  • the opening 111 of the accommodating portion 1 and the outer edge of the end cap body 21 can be fixed by welding.
  • the first electrode lead-out portion 22 is insulated from the end cap body 21, the insulation between the first electrode lead-out portion 22 and the second electrode lead-out portion is achieved.
  • the first electrode lead-out portion 22 is a positive electrode and the second electrode lead-out portion is a negative electrode.
  • the electrode terminal is generally made of aluminum material, if the corresponding first current collector 42 is also made of aluminum material, welding of the same material can be achieved, and there is no need to design the electrode terminal as a copper-aluminum combination structure, which can simplify the structure of the electrode terminal and reduce costs.
  • the first electrode lead-out portion 22 is a negative electrode and the second electrode portion is a positive electrode.
  • the first electrode lead-out portion 22 is an electrode terminal
  • the second electrode lead-out portion is an end cap body 21.
  • One electrode terminal can be omitted, which can simplify the structure of the battery cell 100, reduce the difficulty of assembly, and save costs. Since only one electrode terminal is required on the end cap body 21, it is beneficial to increase the cross-sectional area of the electrode terminal to increase the flow capacity, and more space can be saved on the end cap body 21 for wiring or arranging temperature collection components.
  • the accommodating portion 1 has a large surface area, which can improve the flow capacity and is also convenient for welding with the second current collector 43.
  • end cap body 21 as the second electrode lead-out portion can avoid the current collector occupying the space between adjacent battery cells 100, compared with the side wall 11 of the accommodating portion 1 as the second lead-out portion, which is beneficial to reduce the spacing between adjacent battery cells 100, and can make the layout of multiple battery cells 100 in the battery 200 more compact, thereby improving the energy density of the battery 200.
  • the current collecting assembly 4 further includes an insulating base 41 , and the first current collecting member 42 and the second current collecting member 43 are connected to the insulating base 41 and are insulated from each other by the insulating base 41 .
  • the insulating substrate 41, the first current collecting member 42 and the second current collecting member 43 are integrated into an integral structure, and the insulating substrate 41 not only serves as a fixing substrate for the first current collecting member 42 and the second current collecting member 43, but also provides reliable insulation between the first current collecting member 42 and the second current collecting member 43.
  • the insulating substrate 41 may be made of an insulating material, such as a plastic material.
  • the current collector assembly 4 in this embodiment adopts an integral structure, which simplifies the electrical connection structure inside the battery cell 100, can further save the internal space of the battery cell 100, reduce the weight, and save the production cost of parts; the first current collector 42 and the second current collector 43 are supported by the insulating substrate 41, which can improve the overall rigidity, not easy to deform, and stable installation, thereby improving the reliability of electrical connection. Moreover, this design can also reduce the difficulty of assembly, and there is no need to install the first current collector 42, the second current collector 43 and the insulating substrate 41 separately, which has more obvious advantages for the battery cell 100 with a smaller cross-sectional size, and can improve the assembly efficiency.
  • first current collector 42 and the second current collector 43 are insulated from each other through the insulating substrate 41 integrated with them, which can improve the insulation reliability, reduce the impact of assembly errors or vibrations on the insulation performance, and thus improve the reliability and safety of the battery cell 100.
  • the insulating base 41 , the first current collecting member 42 , and the second current collecting member 43 are integrally injection molded.
  • the insulating matrix 41 can be made of plastic material, not limited to PE (polyethylene), LCP (liquid crystal polymer) and other materials with good thermoplasticity and insulation.
  • PE polyethylene
  • LCP liquid crystal polymer
  • the first current collector 42 and the second current collector 43 can be placed in an injection mold, and injection liquid can be poured in, and the insulating matrix 41 can be formed after the liquid solidifies.
  • This embodiment can reduce the difficulty of processing and assembling the components in the current collecting assembly 4 through one-piece injection molding, thereby improving the production efficiency of the battery cell 100, and is convenient for setting a concave-convex matching structure between the first current collecting member 42 and the second current collecting member 43 and the insulating substrate 41 to increase the bonding strength with the insulating substrate 41, thereby improving the firmness of the first current collecting member 42 and the second current collecting member 43 being set on the insulating substrate 41.
  • the insulating base 41 includes a first insulating portion 411, the first insulating portion 411 has a first opening 413 and a second opening 414, at least a portion of the first current collecting piece 42 is accommodated in the first opening 413, and at least a portion of the second current collecting piece 43 is accommodated in the second opening 414; a portion of the first insulating portion 411 is located between the first opening 413 and the second opening 414, and is used to separate the first current collecting piece 42 and the second current collecting piece 43.
  • the first opening 413 and the second opening 414 penetrate the insulating base 41 .
  • This embodiment can better connect the current collector to the insulating substrate 41 and achieve reliable fixation by accommodating at least part of the first current collector 42 in the first opening 413 and accommodating at least part of the second current collector 43 in the second opening 414, and can reduce the size of the battery cell 100 in the height direction, thereby reducing the volume of the battery cell 100 and improving the energy density.
  • part of the first insulating portion 411 is located between the first opening 413 and the second opening 414, which can insulate the first current collector 42 and the second current collector 43, thereby improving the insulation reliability.
  • a second groove 415 is provided on the inner wall of the first opening 413, and a protrusion 423 is provided on the outer wall of the first current collecting part 42 that cooperates with the first opening 413, and the protrusion 423 is embedded in the second groove 415 to combine the first current collecting part 42 with the insulating base 41; and/or a second groove 415 is provided on the inner wall of the second opening 414, and a protrusion 423 is provided on the outer wall of the second current collecting part 43 that cooperates with the second opening 414, and the protrusion 423 is embedded in the second groove 415 to combine the second current collecting part 43 with the insulating base 41.
  • the first current collector 42 is matched with the first opening 413 as the first portion 421.
  • the first portion 421 may be a fan-shaped structure, and a protrusion 423 may be provided on the outer arc wall and at least one of the two side walls thereof.
  • the thickness of the protrusion 423 may be consistent with that of the first portion 421, or, considering that the thickness of the insulating substrate 41 is relatively thin, in order to ensure the strength of the insulating substrate 41 after the second groove 415 is provided, the thickness of the protrusion 423 may be less than that of the first portion 421.
  • the protrusion 423 provided on the side wall of the first portion 421 may be rectangular, and the length of the protrusion 423 may be less than the length of the side wall; the protrusion 423 provided on the outer arc wall of the first portion 421 may be arc-shaped, and the length of the protrusion 423 may be less than the length of the outer arc wall.
  • the shape and size of the second groove 415 are adapted to the protrusion 423.
  • the part of the second current collecting member 43 that cooperates with the second opening 414 is the third part 431.
  • the third part 431 may be a fan-shaped structure, and a protrusion 423 may be provided on at least one of its two side walls.
  • the thickness of the protrusion 423 may be consistent with that of the third part 431.
  • the thickness of the protrusion 423 may also be made smaller than the thickness of the third part 431.
  • the insulating substrate 41 , the first current collecting member 42 and the second current collecting member 43 are formed by injection molding, and the second groove 415 is naturally formed during the injection molding process.
  • the bonding force between the current collecting piece and the insulating base 41 can be increased, and the first current collecting piece 42 and the second current collecting piece 43 can be more firmly fixed to the insulating base 41, which can not only improve the reliability of electrical connection, but also ensure the insulation between the first current collecting piece 42 and the second current collecting piece 43.
  • a first through hole 424 is provided on the protrusion 423
  • a limiting column 416 is provided on the insulating base 41 , and the limiting column 416 is embedded in the first through hole 424 .
  • a plurality of first through holes 424 may be provided.
  • the insulating substrate 41 , the first current collecting member 42 and the second current collecting member 43 are molded by injection molding, and during the injection molding process, the injection liquid flows into the first through holes 424 to form the limiting pillars 416 .
  • This embodiment provides a first through hole 424 on the protrusion 423, so that when the insulating base 41, the first current collecting part 42 and the second current collecting part 43 are injection molded, the bonding force between the current collecting part and the insulating base 41 can be further increased, so that the first current collecting part 42 and the second current collecting part 43 are fixed to the insulating base 41 more firmly.
  • the battery cell 100 further includes an insulating sheet 6 disposed between the second current collector 43 and the first electrode lead-out portion 22 to achieve insulation between the second current collector 43 and the first electrode lead-out portion 22 .
  • the projections of the first electrode lead-out portion 22 and the second current collector 43 in the cross-section of the accommodating portion 1 will have an overlapping area, which may easily cause a short circuit between the first electrode lead-out portion 22 and the second current collector 43.
  • the insulating sheet 6 at least covers the area where the second current collector 43 and the first electrode lead-out portion 22 are directly opposite. In order to further improve the insulation reliability, the insulating sheet 6 may cover the entire area where the second current collector 43 is connected to the second pole ear 33.
  • the end surface of the second pole lug 33 is fan-shaped
  • the portion of the second current collector 43 electrically connected to the second pole lug 33 is fan-shaped and covers the entire second pole lug 33
  • the insulating sheet 6 is also fan-shaped and covers the entire area where the second current collector 43 is connected to the second pole lug 33.
  • the insulating sheet 6 can be made of insulating materials such as PET.
  • the insulating sheet 6 is used to separate the second current collector 43 and the first electrode lead-out portion 22 of opposite polarities, which can ensure insulation performance and prevent short circuits, thereby improving the reliability and safety of the battery cell 100.
  • the battery cell 100 further includes: a spacer 5 disposed between the first current collector 42 and the first electrode lead-out portion 22 , the spacer 5 and the insulating sheet 6 each being flush with the surface facing the end cap assembly 2 and not lower than the surface of the first insulating portion 411 .
  • the spacer 5 and the insulating sheet 6 are flush with each other, and can form a support plane for supporting the end cap assembly 2, so that the end cap assembly 2 and the current collecting assembly 4 are in balanced contact, and the end cap assembly 2 and the current collecting assembly 4 are prevented from being suspended on one side.
  • the end cap assembly 2 also includes a first insulating member 23, which is arranged between the end cap body 21 and the current collecting assembly 4.
  • the first insulating member 23 can be a plastic member, and the spacer 5 and the insulating sheet 6 are used to support the first insulating member 23, so that the first insulating member 23 and the current collecting assembly 4 are in balanced contact.
  • the surfaces of the spacer 5 and the insulating sheet 6 facing the end cover assembly 2 are flush with the surface of the first insulating part 411, the thickness of the spacer 5 is the thickness of the first insulating part 411 minus the thickness of the first current collecting part 42, and the thickness of the insulating sheet 6 is the thickness of the first insulating part 411 minus the thickness of the second current collecting part 43, which is conducive to the insulating base 41, the spacer 5 and the insulating sheet 6 forming an overall plane together to provide more stable support for the end cover assembly 2 without occupying additional height space.
  • the surfaces of the spacer 5 and the insulating sheet 6 facing the end cap assembly 2 are respectively beyond the surface of the first insulating portion 411.
  • This method is conducive to increasing the thickness of the current collector, making it difficult to penetrate during welding, and can improve the current carrying capacity. It is also conducive to reliably covering the corresponding current collector and reducing the dimensional accuracy requirements of the outer edge.
  • the spacer 5 and the insulating sheet 6 are in contact with the end cap assembly 2, and there is a gap between the first insulating portion 411 and the end cap assembly 2.
  • the surfaces of the spacer 5 and the insulating sheet 6 facing the end cap assembly 2 are lower than the surface of the first insulating portion 411.
  • the first insulating portion 411 contacts the end cap assembly 2, and there is a gap between the spacer 5 and the insulating sheet 6 and the end cap assembly 2.
  • the end surface of the first pole tab 32 is fan-shaped
  • the portion of the first current collector 42 electrically connected to the first pole tab 32 is fan-shaped and covers the entire first pole tab 32
  • the spacer 5 is also fan-shaped and covers the entire area where the first current collector 42 is connected to the first pole tab 32.
  • the spacer 5 and the insulating sheet 6 can be set to the same shape, which can reduce the types of parts and improve the convenience of assembly.
  • the spacer 5 and the insulating sheet 6 can be made of the same material, for example, an insulating material such as PET.
  • the spacer 5 can also be made of a conductive material.
  • This embodiment provides a spacer 5 and makes the spacer 5 flush with the insulating sheet 6, so that the end cap assembly 2 and the current collecting assembly 4 can be in balanced contact, which is beneficial to improving the overall structural rigidity and making the current collecting assembly 4 evenly stressed, and can prevent the current collecting assembly 4 from being displaced or deformed when subjected to vibration or impact, thereby ensuring the stability of the electrical connection, thereby improving the reliability and safety of the battery cell 100.
  • the edge of the first current collecting member 42 close to the receiving portion 1 is surrounded by the insulating base 41 .
  • an insulating substrate 41 is provided between the first current collector 42 and the side wall of the receiving portion 1 to separate the first current collector 42 from the receiving portion 1.
  • the battery cell 100 is cylindrical, the end surface of the first pole tab 32 is fan-shaped, and the portion where the first current collector 42 is connected to the first pole tab 32 is also fan-shaped.
  • the outer contours corresponding to the insulating substrate 41 and the first current collector 42 are arc segments, and the radius of the arc segment of the insulating substrate 41 is greater than the radius of the arc segment of the first current collector 42, so that the radial outer edge of the first current collector 42 is surrounded by the insulating substrate 41.
  • This embodiment surrounds the edge of the first current collector 42 close to the accommodating portion 1 through the insulating substrate 41, which can ensure reliable insulation between the first current collector 42 and the accommodating portion 1. Even when the battery cell 100 is subjected to vibration or impact, the first current collector 42 and the accommodating portion 1 cannot directly contact each other, which can prevent the first current collector 42 of different polarities from short-circuiting with the accommodating portion 1, thereby improving the reliability and safety of the battery cell 100.
  • the end cap assembly 2 also includes a first insulating member 23, which is disposed between the end cap body 21 and the current collecting assembly 4, and the end surface of the first insulating member 23 closest to the electrode assembly 3 is flush with the end surface of the first electrode lead-out portion 22 closest to the electrode assembly 3.
  • the first insulating member 23 may be made of plastic material, and for the cylindrical battery cell 100, the first insulating member 23 is a circular ring structure.
  • a fourth groove 231 is provided on the surface of the first insulating member 23 close to the current collecting assembly 4, and the third section 223 is located in the fourth groove 231, so that the first insulating member 23 and the first electrode lead-out portion 22 are flush with each other at the end surface facing the electrode assembly 3, and the current collecting assembly 4 can provide support for the first insulating member 23 and the first electrode lead-out portion 22 at the same time.
  • the end surface of the first insulating member 23 closest to the electrode assembly 3 extends beyond the end surface of the first electrode lead-out portion 22 closest to the electrode assembly 3.
  • This structure can ensure stable support for the first electrode lead-out portion 22 and prevent the first electrode lead-out portion 22 from being separated from the first current collecting member 42 when subjected to vibration or impact, thereby improving the reliability of the electrical connection; it can also avoid the first electrode lead-out portion 22 being caused by the protrusion of the first insulating member 23.
  • the current collecting assembly 4 can provide support for the first insulating member 23 and the first electrode lead-out portion 22 at the same time, thereby improving the stability of the overall structure, maintaining the position of the first electrode lead-out portion 22 stable, and reducing the deformation of the current collecting assembly 4, thereby improving the reliability of the internal electrical connection of the battery cell 100.
  • the insulating base 41 includes a first insulating portion 411 and a second insulating portion 412 connected to the first insulating portion 411, and the first insulating portion 411 has a first opening 413;
  • the first current collector 42 includes: a first portion 421, which cooperates with the first opening 413 and is electrically connected to the first pole ear 32; and a second portion 422, which is connected to the first portion 421 and overlaps the second insulating portion 412, and the second portion 422 is electrically connected to the first electrode lead-out portion 22.
  • the first insulating part 411 is a circular plate-like structure, and the first insulating part 411 is provided with a first opening 413 and a second opening 414.
  • the first pole ear 32 and the second pole ear 33 are fan-shaped and arranged oppositely, and accordingly, the first opening 413 and the second opening 414 are also fan-shaped and arranged oppositely, for example, they can be symmetrical relative to the center position of the first insulating part 411, and the fan-shaped opening is provided with an inner arc wall at a position close to the central angle of the circle, and the outer arc wall of the first opening 413 is at a preset distance from the outer edge of the first insulating part 411, and the second opening 414 passes through the outer edge of the first insulating part 411.
  • the second insulating part 412 is arranged in the central area of the first insulating part 411, and can be a disc-shaped structure, and the inner arc walls of the first opening 413 and the second opening 414 respectively coincide with the outer wall of the second insulating part 412.
  • the second insulating part 412 can also be eccentrically arranged relative to the first insulating part 411.
  • the first current collector 42 includes a first portion 421 and a second portion 422.
  • the first portion 421 is disposed in the first opening 413 and is electrically connected to the first pole ear 32 for collecting current from the first pole ear 32.
  • the electrical connection can be achieved by welding or the like.
  • the second portion 422 is overlapped with the second insulating portion 412 from a side close to the first electrode lead-out portion 22.
  • the second portion 422 is electrically connected to the first electrode lead-out portion 22.
  • the electrical connection can be achieved by welding or the like.
  • a third through hole 412' is provided at the center of the second insulating portion 412, a fourth through hole 422' is provided on the second portion 422, and an injection hole 227 is provided on the first electrode lead-out portion 22.
  • the electrolyte injected through the injection hole 227 can enter the electrode assembly 3 through the fourth through hole 422' and the third through hole 412'.
  • the first current collector 42 in this embodiment includes a first portion 421 and a second portion 422, so that the first pole tab 32 and the first electrode lead-out portion 22 can be respectively connected to different areas on the first current collector 42, thereby preventing the first current collector 42 from being deformed and damaged due to repeated welding, and improving welding reliability; moreover, the second portion 422 is overlapped on the second insulating portion 412, which can provide stable support for the second portion 422 and prevent the second portion 422 from being deformed; in addition, by setting the second insulating portion 412, insulation between the first current collector 42 and the second pole tab 33 can be achieved, thereby improving insulation reliability and preventing the battery cell 100 from short-circuiting during operation.
  • the first electrode lead-out portion 22 is disposed in a central region of the end cap body 21
  • the second insulating portion 412 is disposed in a central region of the first insulating portion 411 .
  • This embodiment arranges the first electrode lead-out portion 22 in the central area of the end cover body 21, which is beneficial to increasing the cross-sectional area of the first electrode lead-out portion 22, which not only facilitates electrical connection but also improves the current flow capacity; moreover, it is convenient to connect the first electrode lead-out portion 22 of a battery cell 100 and the second electrode lead-out portion of an adjacent battery cell 100 through a busbar, which is beneficial to increasing the width of the busbar and improving the current flow capacity.
  • the projections of the first electrode lead-out portion 22 and the second current collecting member 43 in the cross-section of the accommodating portion 1 have an overlapping area, the second insulating portion 412 protrudes toward the first electrode lead-out portion 22 relative to the first insulating portion 411, and the second portion 422 protrudes toward the first electrode lead-out portion 22 relative to the first portion 421.
  • the surface of the second insulating portion 412 facing the electrode assembly 3 may be flush with the first insulating portion 411, and the surface of the second insulating portion 412 facing the first current collector 42 is higher than the first insulating portion 411. Accordingly, the second portion 422 also protrudes relative to the first portion 421 toward the first electrode lead-out portion 22.
  • the first portion 421 and the second portion 422 may be formed by stamping an integrated thin plate structure.
  • the first current collecting member 42 may be formed by bending or stamping.
  • the first current collecting member 42 may include a first portion 421, a second portion 422 and a connecting portion 426, wherein the connecting portion 426 is connected between the first portion 421 and the second portion 422 to achieve a height difference between the first portion 421 and the second portion 422.
  • the second portion 422 and the first portion 421 may also form a flat plate structure.
  • This embodiment takes into account that when the first electrode lead-out portion 22 and the second current collector 43 have an overlapping area, in order to achieve electrical connection between the second portion 422 and the first electrode lead-out portion 22, the second portion 422 is close to the second current collector 43, which is prone to short circuit.
  • the second insulating portion 412 protrude toward the first electrode lead-out portion 22 relative to the first insulating portion 411, the second portion 422 can be staggered in height from the portion where the second current collector 43 and the second pole ear 33 are connected, so as to prevent a short circuit between the second portion 422 and the second current collector 43 and improve insulation reliability.
  • the inner end surface of the first electrode lead-out portion 22 is provided with a first groove 224 , and at least a portion of the second portion 422 is located in the first groove 224 .
  • the protruding portion may be entirely located in the first groove 224.
  • This structure can not only minimize the height of the battery cell 100, but also provide stable support for the end cap assembly 2 through the current collector assembly 4.
  • the protruding portion may also be partially located in the first groove 224.
  • the diameter f of the first groove 224 is not less than the maximum diameter of the second portion 422 to prevent interference.
  • the end cap assembly 2 may include an end cap body 21 , a first electrode lead-out portion 22 , a first insulating member 23 , a sealing member 24 and a second insulating member 25 .
  • the first electrode lead-out portion 22 includes a first section 221, a second section 222 and a third section 223.
  • the second section 222 and the third section 223 are respectively connected to the two ends of the first section 221.
  • the second section 222 is arranged in the second through hole 211.
  • the second section 222 is located outside the end cover body 21.
  • a second insulating member 25 may be arranged between the second section 222 and the end cover body 21.
  • the third section 223 is located inside the end cover body 21.
  • a sealing member 24 may be arranged between the third section 223 and the end cover body 21.
  • the sealing member 24 is located inside the annular first insulating member 23.
  • the diameters of the second section 222 and the third section 223 are both greater than the diameter of the first section 221.
  • the diameter of the third section 223 is greater than that of the second section 222, so that the third section 223 can support the first insulating member 23 and the sealing member 24 at the same time.
  • a fourth groove 231 is arranged on the surface of the first insulating member 23 close to the current collecting assembly 4, and the third section 223 is located in the fourth groove 231.
  • the inner surface of the first electrode lead-out portion 22 is provided with a first groove 224, the outer surface of the first electrode lead-out portion 22 is provided with a second groove 225, and the bottom surface of the second groove 225 is provided with a third groove 226, thereby reducing the welding thickness of the first electrode lead-out portion 22 and improving the reliability of the electrical connection between the first electrode lead-out portion 22 and the first current collector 42.
  • the bottom surface of the third groove 226 is provided with a liquid injection hole 227 for injecting electrolyte.
  • a first groove 224 is provided on the inner end surface of the first electrode lead-out portion 22, and at least a portion of the second portion 422 is located in the first groove 224, which can reduce the occupied height of the current collecting assembly 4, thereby reducing the height of the battery cell 100.
  • this structure can provide support for the first insulating member 23 and the first electrode lead-out portion 22 through the current collecting assembly 4, thereby improving the stability of the overall structure, maintaining the position of the first electrode lead-out portion 22 stable, and thus improving the reliability of the internal electrical connection of the battery cell 100.
  • the end cap assembly 2 also includes a first insulating member 23, which is disposed between the end cap body 21 and the current collecting assembly 4, and the first insulating member 23 covers the radially outer area of the inner end surface of the first electrode lead-out portion 22, and forms a first groove 224 with the inner end surface of the first electrode lead-out portion 22, and at least a portion of the second portion 422 is located in the first groove 224.
  • the sealing member 24 and the second insulating member 25 are both annular, and their cross sections are both L-shaped.
  • the transverse portion of the sealing member 24 fits with the inner wall of the end cover body 21, and the vertical portion extends into the second through hole 211 and fits with the side wall of the second through hole 211;
  • the transverse portion of the second insulating member 25 fits with the outer wall of the end cover body 21, and the vertical portion extends into the second through hole 211 and fits with the side wall of the second through hole 211, and the vertical portions of the sealing member 24 and the second insulating member 25 abut against each other.
  • the sealing member 24 and the second insulating member 25 are both annular.
  • the first electrode lead-out portion 22 includes a first section 221, a second section 222 and a third section 223, the second section 222 and the third section 223 are respectively connected to the two ends of the first section 221, the first section 221 is arranged in the second through hole 211, the second section 222 is located on the outside of the end cover body 21, the second insulating member 25 is arranged between the second section 222 and the end cover body 21, the third section 223 is located on the inner side of the end cover body 21, and the sealing member 24 is arranged between the third section 223 and the end cover body 21 and is arranged close to the first section 221.
  • the first insulating part 23 includes an annular portion 233, a first extension portion 234 and a second extension portion 235.
  • the first extension portion 234 extends radially inward from the top end of the inner wall of the annular portion 233, and the second extension portion 235 extends radially inward from the bottom end of the inner wall of the annular portion 233.
  • the third section 223 is located in a cavity formed by the first extension portion 234 and the second extension portion 235 being arranged at intervals.
  • the first extension portion 234 covers the radial outer area of the top surface of the third section 223 and abuts against the sealing part 24.
  • the second extension portion 235 covers the radial outer area of the bottom surface of the third section 223.
  • the second extension portion 235 and the inner end surface of the first electrode lead portion 22 form a first groove 224, and at least part of the second portion 422 is located in the first groove 224.
  • the diameter of the first groove 224 is D1, which is greater than the maximum outer diameter of the second portion 422.
  • This embodiment does not need to process the first groove 224 on the inner end surface of the first electrode lead-out portion 22, which can reduce the difficulty of processing the first electrode lead-out portion 22, and the current collecting assembly 4 only needs to provide support for the first insulating member 23. There is no need to consider the alignment between the end surface of the first insulating member 23 closest to the electrode assembly 3 and the end surface of the first electrode lead-out portion 22 closest to the electrode assembly 3, which can reduce the requirements for the processing accuracy of parts.
  • the depth c of the first groove 224 does not exceed the protrusion height of the second portion 422 relative to the first portion 421 .
  • a portion of the second portion 422 is located in the first groove 224 .
  • This embodiment can ensure that the second part 422 is in reliable contact with the bottom of the first groove 224 even when there is a processing error in the first groove 224 or an error in the protruding height of the second part 422 relative to the first part 421, thereby avoiding an assembly gap between the second part 422 and the first electrode lead-out part 22, and ensuring the reliability of the electrical connection between the first electrode lead-out part 22 and the second part 422.
  • the sidewall of the second insulating portion 412 outside the first opening 413 exceeds the outer sidewall of the second portion 422 .
  • the second insulating portion 412 is disc-shaped, and the second portion 422 has a first arc segment 422A, a second arc segment 422B and two straight wall segments 422C.
  • the projection of the first arc segment 422A on the first portion 421 coincides with the inner arc wall of the first portion 421.
  • the second arc segment 422B is arranged opposite to the first arc segment 422A.
  • the two ends of the second arc segment 422B are connected to the two ends of the first arc segment 422A through a straight wall segment 422C.
  • the diameter of the second insulating portion 412 is greater than the diameter of the second arc segment 422B.
  • the side wall of the second insulating portion 412 extends beyond the outer side wall of the second portion 422 , which can separate the second portion 422 from the second current collector 43 , avoid contact between the second portion 422 and the second current collector 43 , and ensure insulation reliability, thereby improving the reliability and safety of the battery cell 100 .
  • At least one corner of the first portion 421 away from the second portion 422 is provided with a first notch 425 , which is configured to cooperate with a first positioning portion in the injection mold to achieve positioning of the first current collecting member 42 .
  • the first current collector 42 and the insulating substrate 41 are formed into one by injection molding, when the first current collector 42 is placed in the injection mold, in order to position the first current collector 42 to prevent positional displacement, a first notch 425 is provided at the corner of the first current collector 42, and a first positioning portion is provided on the bottom surface of the injection mold. The first positioning portion cooperates with the first notch 425.
  • the current collector assembly 4 can be taken out of the injection mold, so that a hole is formed at the first notch 425.
  • the first part 421 is away from the two corners of the second part 422.
  • the first notch 425 can be rectangular, arc-shaped, etc.
  • the first notch 425 is a rectangle of 0.5mm*0.6mm.
  • This embodiment can position the first current collecting component 42 through the first notch 425 when the current collecting component 4 is formed by injection molding, so as to improve the position accuracy of the first current collecting component 42; and, since the circumferential dimension of the inner edge of the first current collecting component 42 is relatively small, which is the bottleneck area of the flow area, the first notch 425 is arranged at the corner of the first part 421 away from the second part 422, which does not affect the flow capacity of the first current collecting component 42.
  • the insulating base 41 includes a first insulating portion 411, the first insulating portion 411 has a second opening 414, and the second current collecting member 43 includes: a third portion 431, which cooperates with the second opening 414 and is electrically connected to the second pole ear 33; and a fourth portion 432, which is at least partially connected to the edge of the third portion 431 close to the accommodating portion 1, and the fourth portion 432 is electrically connected to the end cover body 21.
  • the first insulating part 411 is a circular plate-like structure, and the first opening 413 and the second opening 414 are provided on the first insulating part 411.
  • the first pole ear 32 and the second pole ear 33 are fan-shaped and arranged oppositely, and accordingly, the first opening 413 and the second opening 414 are also fan-shaped and arranged oppositely, for example, they can be symmetrical with respect to the center position of the first insulating part 411, and the fan-shaped opening is provided with an inner arc wall at a position close to the central angle of the circle, and the second opening 414 passes through the outer edge of the first insulating part 411, and the inner arc wall of the second opening 414 coincides with the outer wall of the second insulating part 412.
  • the second current collector 43 includes a third portion 431 and a fourth portion 432.
  • the third portion 431 is disposed in the second opening 414 and is electrically connected to the second pole tab 33, and is used to collect the current of the second pole tab 33.
  • the electrical connection can be achieved by welding or the like.
  • the fourth portion 432 is bent relative to the third portion 431 toward the end cap body 21 or the electrode assembly 3.
  • the fourth portion 432 is electrically connected to the side wall 11 of the accommodating portion 1 or the end cap body 21.
  • the electrical connection can be achieved by welding or the like. At least a portion of the length of the fourth portion 432 extends along the outer edge of the third portion 431, and can form an arc structure.
  • the third portion 431 and the fourth portion 432 may be formed by bending an integral thin plate structure, and the third portion 431 and the fourth portion 432 have the same thickness.
  • the third portion 431 and the fourth portion 432 may also be designed as structures with different thicknesses.
  • the second current collecting member 43 of this embodiment is easy to process. After being integrated with the insulating substrate 41, it can be conveniently electrically connected to the end cover body 21 directly or indirectly through the fourth portion 432, thereby achieving electrical connection between the second electrode tab 33 and the end cover body 21 as the second electrode lead-out portion.
  • At least one corner of the third portion 431 away from the fourth portion 432 is provided with a second notch 433 , which is configured to cooperate with a second positioning portion in the injection mold to achieve positioning of the second current collecting member 43 .
  • the second current collector 43 and the insulating substrate 41 are formed into one by injection molding, when the second current collector 43 is placed in the injection mold, in order to position the second current collector 43 to prevent positional displacement, a second notch 433 is provided at the corner of the second current collector 43, and a second positioning portion is provided on the bottom surface of the injection mold. The second positioning portion cooperates with the second notch 433.
  • the current collector assembly 4 can be taken out of the injection mold, so that a hole is formed at the second notch 433.
  • the third part 431 is away from the two corners of the fourth part 432.
  • the second notch 433 can be rectangular, arc-shaped, etc.
  • the second notch 433 is a rectangle of 0.5mm*0.6mm.
  • This embodiment can position the second current collecting part 43 through the second notch 433 when the current collecting component 4 is formed by injection molding, so as to improve the position accuracy of the second current collecting part 43; and, since the outer edge of the second current collecting part 43 is provided with a bent fourth part 432, the second notch 433 is arranged at the corner of the third part 431 away from the fourth part 432, which facilitates the processing of the second notch 433 and also facilitates the positioning of the second current collecting part 43.
  • the extension length of the fourth portion 432 in the circumferential direction of the accommodating portion 1 does not exceed the edge of the third portion 431 close to the accommodating portion 1 .
  • the extension length of the fourth portion 432 may be equal to the edge length of the third portion 431 close to the receiving portion 1. This structure can directly bend the outer edge of the thin plate structure to form the fourth portion 432, which is simple to process. On this basis, the electrical connection length can be maximized, and the electrical connection reliability and current capacity can be improved. Alternatively, the extension length of the fourth portion 432 may also be less than the edge length of the third portion 431 close to the receiving portion 1. Optionally, the fourth portion 432 may also be connected to the third portion 431 by welding or other methods.
  • This embodiment can reduce the difficulty of processing the second current collecting member 43 , and can be directly formed by bending a thin plate structure, thereby improving the overall structural strength of the second current collecting member 43 and improving the connection reliability between the third part 431 and the fourth part 432 .
  • the fourth portion 432 extends along the entire circumference of the receiving portion 1 .
  • the third portion 431 and the fourth portion 432 may be connected to the edge of the third portion 431 near the accommodating portion 1 by welding, and the remaining length of the fourth portion 432 is connected to the insulating substrate 41 by injection molding.
  • the outer wall of the fourth portion 432 may not exceed the outer wall of the insulating substrate 41.
  • the fourth portion 432 is electrically connected to the bent portion 212 on the end cover body 21.
  • the fourth portion 432 is connected to the side wall 11 of the accommodating portion 1.
  • This embodiment allows the fourth portion 432 to extend along the entire circumference of the accommodating portion 1, which can increase the length of the direct or indirect electrical connection between the fourth portion 432 and the end cover body 21, improve connection reliability, and increase current flow capacity.
  • the fourth portion 432 is disposed at an angle to the third portion 431 .
  • the fourth portion 432 is bent relative to the third portion 431 toward the end cap body 21 or the electrode assembly 3, and the fourth portion 432 is electrically connected to the side wall 11 of the accommodating portion 1 or the end cap body 21, for example, by welding, etc.
  • the angle between the fourth portion 432 and the third portion 431 can be an acute angle, a right angle, or an obtuse angle.
  • the fourth portion 432 is arranged at an angle to the third portion 431, which can increase the area of electrical connection between the fourth portion 432 and the side wall 11 of the accommodating portion 1 or the end cover body 21, facilitate electrical connection by welding, and improve electrical connection reliability.
  • the fourth portion 432 extends toward a direction close to the end cover assembly 2 .
  • This embodiment allows the fourth portion 432 to extend in a direction away from the electrode assembly 3, which can prevent the fourth portion 432 from being inserted between the pole pieces of the electrode assembly 3 during vibration or impact and causing the active material to fall off. It can also prevent the fourth portion 432 from contacting the pole pieces with opposite polarity and causing a short circuit, thereby improving insulation reliability. Moreover, the fourth portion 432 is closer to the opening 111 of the accommodating portion 1, which makes it more convenient to weld the fourth portion 432 to the side wall of the accommodating portion 1 from the opening 111, thereby improving the welding quality.
  • the end cover assembly 2 also includes a first insulating member 23, which is arranged between the end cover body 21 and the current collecting assembly 4, and there is a first gap L1 between the first insulating member 23 and the side wall 11 of the accommodating portion 1 at least in the area corresponding to the fourth portion 432, and the fourth portion 432 is located in the first gap L1.
  • the first insulating member 23 may have a first gap L1 only between the area corresponding to the fourth portion 432 and the receiving portion 1, so that the fourth portion 432 can extend therein, or for the convenience of processing and assembly, the first insulating member 23 may have a consistent first gap L1 between the receiving portion 1 in the entire circumferential direction.
  • a preset interval is provided between the fourth portion 432 and the end cover body 21, so that the end cover assembly 2 can be installed in place at the opening 111 of the receiving portion 1.
  • the fourth portion 432 is located in the first gap L1 between the first insulating member 23 and the accommodating portion 1, and can share space with the first insulating member 23.
  • the inner side of the fourth portion 432 is insulated by the first insulating member 23.
  • the fourth portion 432 can be prevented from being inserted between the pole pieces of the electrode assembly 3 under vibration or impact to cause the active material to fall off, and can also be prevented from contacting the pole pieces with opposite polarity to cause a short circuit, thereby improving insulation reliability.
  • the fourth portion 432 is closer to the opening 111 of the accommodating portion 1, and it is more convenient to weld the fourth portion 432 to the side wall 11 of the accommodating portion 1 from the opening 111. When welding is used, the fourth portion 432 and the side wall 11 can be welded from the inside of the accommodating portion 1, which can improve the welding quality, or it is convenient to directly electrically connect the fourth portion 432 to the end cover body 21.
  • the housing 10 is cylindrical, the first insulating member 23 is annular, the outer diameter of the first insulating member 23 is d, the outer diameter of the end cover body 21 is D, the thickness of the fourth portion 432 is ⁇ , d ⁇ D-2* ⁇ .
  • the outer wall of the first insulating member 23 is configured as a circumferential surface for easy processing. Furthermore, when assembling the end cover assembly 2 where the first insulating member 23 is located, it is not necessary to circumferentially align the first insulating member 23 with the fourth portion 432, thereby facilitating assembly and improving assembly efficiency.
  • the receiving portion 1 has a side wall 11 , and the second current collecting member 43 is electrically connected to the end cover body 21 through the side wall 11 .
  • the receiving portion 1 has a side wall 11 and an end wall 12, one end of the side wall 11 forms an opening 111 and is closed by the end cover assembly 2, and the other end of the side wall 11 is closed by the end wall 12.
  • the second current collecting member 43 is electrically connected to the end cover body 21 through the side wall 11, that is, the second current collecting member 43 is electrically connected to the side wall 11, and the side wall 11 is electrically connected to the end cover body 21.
  • the fourth portion 432 of the second current collecting member 43 is electrically connected to the side wall 11, for example, by welding, and the welding operation can be performed from the inside or outside of the receiving portion 1.
  • the side wall 11 and the end cover body 21 can be electrically connected at the opening 111 by welding.
  • the second current collecting component 43 is electrically connected to the end cover body 21 through the side wall 11, which can reduce the requirement on the length of the outer end connection portion of the second current collecting component 43 and the requirement on the structure of the end cover body 21.
  • the end cover body 21 can be designed as a flat plate structure without considering the connection problem with the second current collecting component 43, which can simplify the structure of the end cover body 21 and reduce the manufacturing difficulty.
  • the second current collector 43 and the side wall 11 can be welded from the inside of the receiving part 1.
  • this method makes it easy to observe the welding situation, which can improve the welding reliability. If the fourth part 432 is in virtual contact with the side wall of the receiving part 1, it can be adjusted in time, and the welding will not be affected by the coating on the outer surface of the receiving part 1, which can ensure the welding quality; moreover, this welding method will not damage the coating outside the receiving part 1, which can ensure the corrosion resistance of the battery cell 100.
  • the second current collector 43 is a negative electrode current collector
  • the negative electrode current collector is made of copper material
  • the receiving part 1 is made of steel material.
  • microcracks are also located on the inner wall surface of the receiving part 1, and the battery cell 100 will not cause electrolyte penetration after a long time, and the receiving part 1 will not corrode at the cracks.
  • the end cover body 21 has a bending portion 212 , which protrudes toward the inside of the end cover body 21 and is disposed close to the accommodating portion 1 , and the second current collecting member 43 is electrically connected to the bending portion 212 .
  • the bent portion 212 may be disposed in an area of the end cap body 21 outside the first electrode lead-out portion 22 and may be disposed near the edge of the end cap body 21.
  • the end cap body 21 may be formed into a bent portion 212 by stamping using a plate-like structure, and the cross section of the bent portion 212 may be U-shaped, and the extension length of the bent portion 212 may be consistent with the extension length of the fourth portion 432.
  • the fourth portion 432 of the second current collector 43 may be welded to the side or bottom surface of the bent portion 212.
  • the second current collector 43 may be in contact with the side wall 11, or a gap may be maintained.
  • the fourth portion 432 can extend along the entire circumference of the accommodating portion 1, and accordingly, the bent portion 212 also extends along the entire circumference of the end cap body 21, which can increase the electrical connection length between the fourth portion 432 and the bent portion 212, improve the electrical connection reliability, and increase the current capacity.
  • the strength of the end cap body 21 can be increased, making the strength of the end cap body 21 uniform in the entire circumference.
  • the second current collector 43 is electrically connected to the end cover body 21 through the bending portion 212, which can increase the contact area between the second current collector 43 and the end cover body 21.
  • the second current collector 43 can also reliably output electrical energy to the end cover body 21.
  • it can also solve the problem that the thin housing portion 1 and the end cover body 21 affect the flow capacity.
  • a second gap L2 is defined between the bent portion 212 and the accommodating portion 1 , and an outer end of the second current collecting member 43 is located in the second gap L2 .
  • the end cap assembly 2 includes an end cap body 21 and a first insulating member 23, and the first insulating member 23 is arranged between the end cap body 21 and the current collecting assembly 4.
  • the radial inner wall of the bent portion 212 is in contact with the outer wall of the first insulating member 23, and the fourth portion 432 of the second current collecting member 43 is in contact with the radial outer wall of the bent portion 212.
  • the fourth portion 432 is located in the second gap L2, and the second gap L2 is smaller than the first gap L1.
  • the fourth portion 432 can contact the side wall 11, or maintain a gap.
  • a third gap H can be maintained between the bottom of the bent portion 212 and the third portion 431 of the second current collecting member 43 to avoid interference between the bent portion 212 and the third portion 431.
  • This embodiment brings the second current collecting member 43 into contact with the side wall of the bending portion 212 toward the accommodating portion 1, which facilitates electrical connection by welding, and is also beneficial for increasing the area of electrical connection between the second current collecting member 43 and the bending portion 212, improving the reliability of electrical connection, and maintaining the position of the second current collecting member 43 stable.
  • the first electrode tab 32 and the second electrode tab 33 are spaced apart along the circumference of the electrode assembly 3 .
  • the first pole lug 32 and the second pole lug 33 are arranged at intervals along the circumference of the electrode assembly 3, so that the first pole lug 32 and the second pole lug 33 both extend along part of the circumference of the electrode assembly 3.
  • the first pole lug 32 and the second pole lug 33 can be arranged relative to each other, for example, the first pole lug 32 and the second pole lug 33 are centrally symmetrical with respect to the winding axis K, so as to increase the distance between the first pole lug 32 and the second pole lug 33, which is conducive to ensuring the insulation effect.
  • the first pole lug 32 and the second pole lug 33 can be fan-shaped or rectangular, etc., and the shapes of the two can be the same or different.
  • the arrangement of the first pole ear 32 and the second pole ear 33 in this embodiment can not only better separate the pole ears of different polarities in space, but also allow the electrolyte to penetrate into the interior of the electrode body 31 through the spacing area, so that the electrolyte and the active material on the pole piece can fully react during the charging and discharging process of the battery cell 100.
  • the shape of the connecting portion between the first current collector 42 and the first pole tab 32 is the same as the end surface shape of the first pole tab 32 ; and/or the shape of the connecting portion between the second current collector 43 and the second pole tab 33 is the same as the end surface shape of the second pole tab 33 .
  • the first current collector 42 is connected to the first pole tab 32 at a first portion 421, and the first portion 421 is disposed in the first opening 413.
  • the second current collector 43 is connected to the second pole tab 33 at a first portion 421, and the third portion 431 is disposed in the second opening 414.
  • the first portion 421, the first opening 413, and the end surface of the first pole tab 32 have the same shape
  • the third portion 431, the second opening 414, and the end surface of the second pole tab 33 have the same shape.
  • the first electrode tab 32 and the second electrode tab 33 may be designed to be fan-shaped or rectangular, and the shapes of the first opening 413 and the second opening 414 may be designed according to the shapes of the first electrode tab 32 and the second electrode tab 33 .
  • This embodiment is conducive to making the entire end surface of the first pole lug 32 and/or the second pole lug 33 electrically connected to the corresponding current collector, thereby ensuring the current transmission capability; on this basis, it can also reduce the redundant area of the current collector and save materials.
  • the portion of the first current collector 42 connected to the first electrode tab 32 covers the first electrode tab 32 ; and/or the portion of the second current collector 43 connected to the second electrode tab 33 covers the second electrode tab 33 .
  • the first current collector 42 is connected to the first pole tab 32 as the first portion 421, and the first portion 421 is disposed in the first opening 413.
  • the second current collector 43 is connected to the second pole tab 33 as the first portion 421, and the third portion 431 is disposed in the second opening 414.
  • the first portion 421 covers the first pole tab 32, so that the first pole tab 32 as a whole can be reliably electrically connected to the first portion 421 to ensure the current transmission capability.
  • the third portion 431 covers the second pole tab 33, so that the second pole tab 33 as a whole can be reliably electrically connected to the third portion 431 to ensure the current transmission capability.
  • This embodiment enables the entire end surface of the first pole tab 32 and/or the second pole tab 33 to be electrically connected to the corresponding current collecting member, thereby ensuring the current transmission capability.
  • the electrode assembly 3 is in a winding structure, and at least one of the first electrode tab 32 and the second electrode tab 33 gradually increases in width from the center to the outside along the radial direction of the winding structure.
  • At least one of the first electrode tab 32 and the second electrode tab 33 may be fan-shaped.
  • This embodiment can make the spacing between the first pole lugs of each group of adjacent layers in the first pole lugs 32 evenly distributed, or make the spacing between the second pole lugs of each group of adjacent layers in the second pole lugs 33 evenly distributed; moreover, by increasing the width of the pole lugs in the outer layer region along the winding direction, the effective contact area when the pole lugs are connected to the current collector can be increased, which can increase the current flow capacity, thereby improving the performance of the battery cell 100.
  • the electrode assembly 3 is in a winding structure, and at least one of the first pole ear 32 and the second pole ear 33 has a uniform width from the center to the outside along the radial direction of the winding structure.
  • at least one of the first pole ear 32 and the second pole ear 33 is rectangular. This structure can reduce the difficulty of die-cutting the pole ear, and it is easy to ensure the size of the pole ear part, and it is easy to ensure the alignment of the multi-layer pole ear parts during winding, thereby reducing the process difficulty of preparing the electrode assembly 3.
  • the surface of the insulating base 41 facing the electrode body 31 has a third insulating portion, and the third insulating portion is located between the first electrode tab 32 and the second electrode tab 33 .
  • the third insulating part can be located between the first pole ear 32 and the second pole ear 33 in the circumferential direction of the electrode assembly 3, or, without blocking the central hole 311 of the electrode body 31, the third insulating part can also be located between the first pole ear 32 and the second pole ear 33 in the radial direction of the electrode assembly 3, which can not only improve the insulation effect, but also enable the internal gas and high-temperature substances to smoothly reach the pressure relief component on the shell 10 along the central hole 311 when thermal runaway occurs in the battery cell 100.
  • This embodiment can further separate the first pole lug 32 and the second pole lug 33 by a third insulating portion made of an insulating material on the basis of maintaining a distance between the first pole lug 32 and the second pole lug 33 in space, thereby improving insulation reliability, thereby improving the reliability and safety of the battery cell 100.
  • the third insulating portion as a part of the insulating substrate 41, does not need to be provided with a separate structure, nor does it need to be additionally fixed.
  • the following takes a cylindrical battery cell 100 as an example to illustrate the structure of the battery cell 100 of the present application through two specific embodiments.
  • 3 to 14 are diagrams of the first embodiment of the present application.
  • the battery cell 100 includes: a shell 10, an electrode assembly 3 and a current collecting assembly 4.
  • the shell 10 includes a housing 1 and an end cap assembly 2, and the end cap assembly 2 is used to close the opening 111 of the housing 1.
  • the end cap assembly 2 includes: the end cap assembly 2 may include an end cap body 21 and a first electrode lead-out portion 22, and the end cap body 21 is provided with a second through hole 211.
  • the first electrode lead-out portion 22 is arranged in the second through hole 211, and the first electrode lead-out portion 22 can be an electrode terminal.
  • the housing 1 serves as a second electrode lead-out portion.
  • the electrode assembly 3 is disposed in the accommodating portion 1.
  • the electrode assembly 3 is a winding structure, including an electrode body 31, a first pole ear 32 and a second pole ear 33.
  • the electrode body 31 is cylindrical, and the first pole ear 32 and the second pole ear 33 are led out from the same end of the electrode body 31 close to the end cap assembly 2.
  • the first pole ear 32 and the second pole ear 33 can be arranged opposite to each other relative to the winding axis K, and their end faces can be fan-shaped or rectangular structures.
  • the first pole ear 32 and the second pole ear 33 are centrally symmetrical relative to the winding axis K.
  • the current collecting assembly 4 is located between the end cap assembly 2 and the electrode assembly 3 in the direction of the winding axis K.
  • the end cover assembly 2 also includes a first insulating member 23, a sealing member 24, a second insulating member 25 and a sealing cover 26.
  • the first insulating member 23 is located between the end cover body 21 and the current collecting assembly 4.
  • the end cover body 21 is a disc-shaped structure, and the first insulating member 23 is a ring-shaped structure.
  • the diameter of the first insulating member 23 is smaller than the diameter of the end cover body 21.
  • the first electrode lead-out portion 22 includes a first section 221, a second section 222 and a third section 223, the second section 222 and the third section 223 are respectively connected to the two ends of the first section 221, the first section 221 is arranged in the second through hole 211, the second section 222 is located outside the end cover body 21, a second insulating member 25 may be arranged between the second section 222 and the end cover body 21, the third section 223 is located inside the end cover body 21, a sealing member 24 may be arranged between the third section 223 and the end cover body 21, and the sealing member 24 is located in the annular first insulating member 23.
  • a fourth groove 231 is arranged on the surface of the first insulating member 23 close to the current collecting assembly 4, and the third section 223 is located in the fourth groove 231, so that the first insulating member 23 and the surface of the first electrode lead-out portion 22 facing the electrode assembly 3 are flush.
  • the inner surface of the first electrode lead-out portion 22 is provided with a first groove 224, the outer surface of the first electrode lead-out portion 22 is provided with a second groove 225, and the bottom surface of the second groove 225 is provided with a third groove 226, thereby reducing the welding thickness of the first electrode lead-out portion 22 and improving the reliability of the electrical connection between the first electrode lead-out portion 22 and the first current collector 42.
  • the bottom surface of the third groove 226 is provided with a liquid injection hole 227 for injecting electrolyte.
  • the second current collector 43 includes a third portion 431 and a fourth portion 432 connected to each other, the third portion 431 is welded to the second electrode tab 33, the fourth portion 432 is bent relative to the third portion 431 toward the end cover body 21, and is located in the gap between the first insulating member 23 and the accommodating portion 1, and the fourth portion 432 is electrically connected to the side wall of the accommodating portion 1 by welding.
  • the third portion 431 is covered with an insulating sheet 6 to achieve insulation between the third portion 431 and the first electrode lead-out portion 22.
  • the first current collector 42 includes a first portion 421 and a second portion 422 connected to each other, the second portion 422 protrudes relative to the first portion 421 toward the first electrode lead-out portion 22, and the protruding portion is located in the first groove 224.
  • the surface of the first portion 421 is covered by a spacer 5, and the spacer 5 and the insulating sheet 6 are flush with the surface of the first electrode lead-out portion 22, so as to provide stable support for the first electrode lead-out portion 22 and the first insulating member 23.
  • the current collecting assembly 4 includes an insulating substrate 41, a first current collecting member 42 and a second current collecting member 43, and these three parts can be integrally formed by injection molding.
  • the first current collecting member 42 and the second current collecting member 43 are insulated from each other by the insulating substrate 41.
  • the insulating base 41 includes a first insulating portion 411 and a second insulating portion 412 provided in the central area of the first insulating portion 411.
  • the first insulating portion 411 is a circular plate-shaped structure.
  • the first opening 413 and the second opening 414 are provided in the first insulating portion 411.
  • the first opening 413 and the second opening 414 are provided opposite to each other and both adopt a fan-shaped structure with an inner arc.
  • the second insulating portion 412 protrudes toward the end cap assembly 2 relative to the first insulating portion 411.
  • the diameter of the first insulating portion 411 is greater than the diameter of the outer arc wall of the first opening 413, and the second opening 414 passes through the outer edge of the first insulating portion 411.
  • the first current collector 42 includes: a first portion 421 and a second portion 422, the first portion 421 cooperates with the first opening 413 and is electrically connected to the first electrode tab 32; the second portion 422 is connected to the first portion 421 and overlaps the second insulating portion 412, the second portion 422 protrudes relative to the first portion 421 toward the direction of the first electrode lead-out portion 22, and the second portion 422 is electrically connected to the first electrode lead-out portion 22.
  • the second current collector 43 includes: a third portion 431 and a fourth portion 432, the third portion 431 cooperates with the second opening 414 and is electrically connected to the second electrode tab 33, the fourth portion 432 is arranged at an angle to the third portion 431, and the fourth portion 432 is electrically connected to the side wall 11 of the accommodating portion 1, thereby, the second current collector 42 is electrically connected to the end cover body 21 through the side wall 11.
  • the first portion 421 has two corners away from the second portion 422, each having a first notch 425, configured to cooperate with the first positioning portion in the injection mold to achieve the positioning of the first current collector 42.
  • the third portion 431 has two corners away from the fourth portion 432, each having a second notch 433, configured to cooperate with the second positioning portion in the injection mold to achieve the positioning of the second current collector 43.
  • the first part 421 may be a fan-shaped structure, and a protrusion 423 may be provided on the outer arc wall and at least one of the two side walls thereof.
  • the thickness of the protrusion 423 may be consistent with that of the first part 421, or, considering that the thickness of the insulating base 41 is relatively thin, in order to ensure the strength of the insulating base 41 after the second groove 415 is provided, the thickness of the protrusion 423 may be less than that of the first part 421.
  • the protrusion 423 provided on the side wall of the first part 421 may be rectangular, and the length of the protrusion 423 may be less than the length of the side wall; the protrusion 423 provided on the outer arc wall of the first part 421 may be arc-shaped, and the length of the protrusion 423 may be less than the length of the outer arc wall.
  • the shape and size of the second groove 415 are adapted to the protrusion 423.
  • the part of the second current collecting member 43 that cooperates with the second opening 414 is the third part 431.
  • the third part 431 may be a fan-shaped structure, and a protrusion 423 may be provided on at least one of its two side walls.
  • the thickness of the protrusion 423 may be consistent with that of the third part 431.
  • the thickness of the protrusion 423 may also be made smaller than the thickness of the third part 431.
  • a first through hole 424 is provided on the protrusion 423, and a limiting column 416 is provided on the insulating base 41, and the limiting column 416 is embedded in the first through hole 424.
  • the second groove 415 and the limiting column 416 are both naturally formed during the injection molding process.
  • FIG. 15 to FIG. 20 are the second embodiment of the present application, which is different from the first embodiment in that:
  • the second current collector 43 includes: a third portion 431 and a fourth portion 432, the third portion 431 cooperates with the second opening 414 and is electrically connected to the second pole ear 33, the fourth portion 432 is arranged at an angle to the third portion 431, and the fourth portion 432 extends along the entire circumference of the accommodating portion 1, the third portion 431 and the fourth portion 432 can be connected to the edge of the third portion 431 close to the accommodating portion 1 by welding, and the remaining length of the fourth portion 432 is connected to the insulating substrate 41 by injection molding.
  • the fourth portion 432 is bent upward and electrically connected to the radial outer side wall of the bent portion 212 on the end cover body 21, and the fourth portion 432 is located in the second gap L2 formed between the bent portion 212 and the accommodating portion 1.
  • the second current collector 43 is directly electrically connected to the end cover body 21.
  • the second insulating portion 412 is flush with the surface of the first insulating portion 411 facing the end cover assembly 2.
  • the first current collecting part 42 includes a first portion 421 and a second portion 422 that are connected to each other.
  • the second portion 422 is overlapped on the second insulating portion 412. There is a height difference between the first portion 421 and the second portion 422, and the two are connected by a connecting portion 426.
  • the assembly method of the battery cell 100 is as follows: after placing the current collecting assembly 4 at the end of the electrode assembly 3, welding the first current collecting member 42 to the first pole tab 32, and welding the second current collecting member 43 to the second pole tab 33, installing the end cap assembly 2, welding the first electrode lead-out portion 22 to the first current collecting member 42 from the outside, and welding the fourth portion 432 of the first current collecting member 42 to the bent portion 212. Finally, the whole formed by the electrode assembly 3 and the end cap assembly 2 is loaded into the receiving portion 1, and then the end cap body 21 and the receiving portion 1 are welded and sealed at the opening 111.
  • a plurality of battery cells 100 may be electrically connected in the following manner.
  • the battery 200 further includes a busbar 202, a first end of the busbar 202 is connected to the first electrode lead-out portion 22 of one of the battery cells 100, and a second end of the busbar 202 is connected to the second electrode lead-out portion of another battery cell 100.
  • the busbar 202 can be a metal sheet or plate structure. This embodiment can conveniently realize the electrical connection of multiple battery cells 100.
  • the shell 10 includes: a accommodating portion 1 having an opening 111; and an end cap assembly 2 that closes the opening 111, the end cap assembly 2 including an end cap body 21 and a first electrode lead-out portion 22 insulated and arranged on the end cap body 21; wherein the second end of the busbar 202 is connected to the end cap body 21.
  • the first electrode lead-out portion 22 can be arranged at the center position of the end cover body 21.
  • This structure is conducive to increasing the width dimension of the current collector 202 and increasing the cross-sectional area of the first electrode lead-out portion 22 to improve the current flow capacity.
  • the current collector 202 may include a strip portion and two forked portions, both of which are connected to the first end of the strip portion and are respectively located on both sides of the first electrode lead-out portion 22.
  • the two forked portions are attached to the outer surface of the end cover body 21 of one of the battery cells 100, and the second end of the strip portion is connected to the top surface of the first electrode lead-out portion 22 of the other battery cell 100. Since the top surface of the first electrode lead-out portion 22 is higher than the surface of the end cover body 21, a bending structure may be provided on the strip portion to adapt to the height difference between the first electrode lead-out portion 22 and the end cover body 21.
  • At least one row of battery cells 100 is provided in the battery 200 , and the busbars 202 in each row of battery cells 100 are connected in sequence.
  • This embodiment can conveniently realize the electrical connection of multiple battery cells 100, allowing the layout of multiple battery cells 100 to be more compact, and is conducive to increasing the width of the busbar 202 and improving the current carrying capacity.
  • the present application also provides a method for manufacturing a battery cell 100, comprising the following steps:
  • S110 providing a housing: providing a housing 10, wherein the housing 10 is provided with a first electrode lead-out portion 22 and a second electrode lead-out portion having opposite polarities;
  • Electrodes providing an electrode assembly 3 and placing it in the housing 10, wherein the electrode assembly 3 comprises an electrode body 31, a first electrode tab 32 and a second electrode tab 33, wherein the first electrode tab 32 and the second electrode tab 33 are led out from the same side of the electrode body 31;
  • the current collecting assembly 4 is arranged on one side of the electrode body 31 close to the first pole tab 32 and the second pole tab 33, the current collecting assembly 4 includes a first current collecting part 42 and a second current collecting part 43, and the first pole tab 32 and the first electrode lead-out portion 22 are electrically connected through the first current collecting part 42, and the second pole tab 33 and the second electrode lead-out portion are electrically connected through the second current collecting part 43.
  • S110 to S130 are executed sequentially.
  • the first pole ear 32 and the second pole ear 33 are led out from the same end of the electrode body 31. Only electrical connection space needs to be reserved at one end of the electrode assembly 3, and there is no need to respectively set electrode lead-out parts at both ends of the battery cell 100. This can effectively improve the overall energy density of the battery cell 100.
  • the capacity of the battery cell 100 is constant, the volume of the battery cell 100 can be reduced, making it easier for the battery 200 to be installed in an electrical device with limited height space; or when the volume of the battery cell 100 is constant, the capacity can be increased and the battery life of the battery 200 can be extended.
  • the manufacturing method of the present application further includes: connecting the first current collecting member 42 and the second current collecting member 43 to the insulating base 41 , and insulating the first current collecting member 42 and the second current collecting member 43 from each other through the insulating base 41 .
  • the manufacturing method of this embodiment simplifies the electrical connection structure inside the battery cell 100, which can further save the internal space of the battery cell 100, reduce the weight, and save the production cost of parts; the first current collector 42 and the second current collector 43 are supported by the insulating substrate 41, which can improve the overall rigidity, not easy to deform, and stable installation, thereby improving the reliability of electrical connection. Moreover, this design can also reduce the difficulty of assembly, and there is no need to install the first current collector 42, the second current collector 43 and the insulating substrate 41 separately, which has more obvious advantages for the battery cell 100 with a smaller cross-sectional size, and can improve the assembly efficiency.
  • first current collector 42 and the second current collector 43 are insulated from each other through the insulating substrate 41 integrated with them, which can improve the insulation reliability, reduce the impact of assembly errors or vibrations on the insulation performance, and thus improve the reliability and safety of the battery cell 100.
  • the housing 10 includes a housing 1 and an end cap assembly 2, the housing 1 has an opening 111, the end cap assembly 2 closes the opening 111, the end cap assembly 2 includes an end cap body 21, the first electrode lead-out portion 22 is disposed on the end cap body 21, and the end cap body 21 serves as a second electrode lead-out portion;
  • S130 electrical connection step includes:
  • the first electrode tab 32 is welded to the first portion 421 of the first current collecting member 42
  • the second electrode tab 33 is welded to the third portion 431 of the second current collecting member 43 , for example, by laser welding.
  • the execution order of S132 and S133 can be selected according to the needs of the specific structure.
  • the second current collector 43 can be directly electrically connected to the end cover body 21, or the second current collector 43 can be electrically connected to the end cover body 21 through the side wall 11 of the accommodating portion 1.
  • the second portion 422 of the first current collector 42 is welded to the first electrode lead-out portion 22 from the outside of the end cover assembly 2. After welding, the sealing cover 26 can be installed on the first electrode lead-out portion 22 to close the injection hole 227.
  • This embodiment can smoothly realize the electrical connection between the first current collecting member 42 and the first electrode lead-out portion 22 , and the electrical connection between the second current collecting member 43 and the receiving portion 1 .
  • the receiving portion 1 has a side wall 11 , and the receiving portion 1 is electrically connected to the end cover body 21 .
  • the step S132 of electrically connecting the second current collecting member 43 to the end cover body 21 includes:
  • the second current collecting member 43 is electrically connected to the side wall 11 , and the side wall 11 is electrically connected to the end cover body 21 .
  • the second current collector 43 is electrically connected to the end cover body 21 through the side wall 11, that is, the second current collector 43 is electrically connected to the side wall 11, and the side wall 11 is electrically connected to the end cover body 21.
  • the fourth portion 432 of the second current collector 43 is electrically connected to the side wall 11, for example, by welding, and the welding operation can be performed from the inside or outside of the accommodating portion 1.
  • the side wall 11 and the end cover body 21 can be electrically connected at the opening 111 by welding.
  • the second current collecting component 43 is electrically connected to the end cover body 21 through the side wall 11, which can reduce the requirement on the length of the outer end connection portion of the second current collecting component 43 and the requirement on the structure of the end cover body 21.
  • the end cover body 21 can be designed as a flat plate structure without considering the connection problem with the second current collecting component 43, which can simplify the structure of the end cover body 21 and reduce the manufacturing difficulty.
  • the second current collecting member 43 is welded to the side wall 11 from the inner side of the receiving portion 1 .
  • S132 is performed before S133.
  • the fourth part 432 of the second current collector 43 can be welded to the side wall of the receiving part 1 from the inside of the receiving part 1. This method makes it easy to observe the welding situation, which can improve the welding reliability. If the fourth part 432 is in virtual contact with the side wall of the receiving part 1, it can be adjusted in time, and the welding will not be affected by the coating on the outer surface of the receiving part 1, so the welding quality can be guaranteed. Moreover, this welding method will not damage the coating outside the receiving part 1, and the corrosion resistance of the battery cell 100 can be guaranteed.
  • the end cap assembly 2 is installed at the opening of the receiving part 1.
  • S133 is performed before S132, first the end cap assembly 2 is installed at the opening 111 of the receiving part 1, and then the fourth part 432 is welded to the side wall of the receiving part 1 from the outside of the receiving part 1.
  • this method can realize welding the second current collector 43 and the side wall 11 from the inside of the accommodating part 1.
  • the second current collector 43 is a negative electrode current collector
  • the negative electrode current collector is made of copper material
  • the accommodating part 1 is made of steel material. Even if different materials have differences in thermal expansion coefficients and thermal conductivity, microcracks will appear in the weld area and the heat-affected zone during laser welding. The microcracks are also located on the inner wall surface of the accommodating part 1.
  • the battery cell 100 will not cause electrolyte penetration after a long time, and the accommodating part 1 will not corrode at the cracks.
  • the second current collector 43 includes: a third portion 431, which is used to be electrically connected to the second electrode tab 33; and a fourth portion 432, which is connected to the edge of the third portion 431 close to the accommodating portion 1, the fourth portion 432 is arranged at an angle to the third portion 431, and the fourth portion 432 is electrically connected to the side wall 11; the manufacturing method also includes:
  • the angle between the fourth portion 432 and the third portion 431 is an obtuse angle.
  • the angle may be within the following range (90°, 120°).
  • the fourth portion 432 is bent and adjusted to form an obtuse angle with the third portion 431, that is, the free end of the fourth portion 432 is expanded outward relative to the end connected to the third portion 431.
  • the fourth portion 432 is retracted inwardly under the action of the side wall of the accommodating portion 1, and an interference fit with the side wall of the accommodating portion 1 is ensured, which can ensure the welding effect and improve the reliability of the electrical connection.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Connection Of Batteries Or Terminals (AREA)

Abstract

本申请实施例提供一种电池单体及其制造方法、电池及用电装置，其中，电池单体（100）包括：壳体（10），设有极性相反的第一电极引出部（22）和第二电极引出部；电极组件（3），设在壳体（10）内，电极组件（3）包括电极主体（31）以及从电极主体（31）同侧引出的第一极耳（32）和第二极耳（33）；集流组件（4），设于电极主体（31）靠近第一极耳（32）和第二极耳（33）的一侧，集流组件（4）包括第一集流件（42）和第二集流件（43），第一集流件（42）将第一极耳（32）和第一电极引出部（22）电连接，第二集流件（43）将第二极耳（33）和第二电极引出部电连接。

Description

电池单体及其制造方法、电池及用电装置 技术领域
本申请涉及电池技术领域，特别是涉及一种电池单体及其制造方法、电池及用电装置。
背景技术
由于锂离子等电池具有能量密度高、功率密度高、循环使用次数多、存储时间长等优点，在电动汽车等用电装置上面已普遍应用。
但是，目前电池单体的结构设计使其能量密度较低，因此如何优化电池单体的结构一直是业内的一个难题。
发明内容
本申请的目的在于优化电池单体的结构。
根据本申请的第一方面，提供了一种电池单体，包括：
壳体，设有极性相反的第一电极引出部和第二电极引出部；
电极组件，设在壳体内，电极组件包括电极主体以及从电极主体同侧引出的第一极耳和第二极耳；
集流组件，设于电极主体靠近第一极耳和第二极耳的一侧，集流组件包括第一集流件和第二集流件，第一集流件将第一极耳和第一电极引出部电连接，第二集流件将第二极耳和第二电极引出部电连接。
该实施例将第一极耳和第二极耳从电极主体的同一端引出，只需要在电极组件的一端预留电连接空间，无需在电池单体的两端分别设置电极引出部，可有效提高电池单体的整体能量密度，在电池单体的容量一定的情况下，能够减小电池单体的体积，使电池更容易安装于高度空间有限的用电装置中；或者在电池单体的体积一定的情况下，能够提高容量，延长电池的续航能力。
在一些实施例中，第一集流件的至少部分抵接于第一极耳背离述电极主体的表面，第二集流件的至少部分抵接于第二极耳背离述电极主体的表面。
该实施例利于使第一集流件与第一极耳中的各层第一极耳部电连接，且第二集流件与第二极耳中的各层第二极耳部电连接提高集流件与相应极耳电连接的可靠性，并提 高过流能力。
在一些实施例中，壳体包括：
容纳部，具有开口；和
端盖组件，封闭开口，端盖组件包括端盖本体和绝缘设置于端盖本体的第一电极引出部，且端盖本体作为第二电极引出部；
其中，第二集流件与端盖本体电连接。
该实施例中的第一电极引出部为电极端子，第二电极引出部为端盖本体，可省去一个电极端子，能够简化电池单体的结构，降低装配难度，节约成本。由于端盖本体上只需设置一个电极端子，有利于增加电极端子横截面积以增加过流能力，且可在端盖本体上省出更多的空间走线或布置采温部件等。而且，容纳部具有较大的表面积，可提高过流能力，也便于与第二集流件焊接。此外，将端盖本体作为第二电极引出部，与容纳部的侧壁作为第二引出部相比，可避免汇流件占用相邻电池单体之间的空间，利于减小相邻电池单体之间的间距，可使电池中多个电池单体的布局更紧凑，从而提高电池的能量密度。
在一些实施例中，集流组件还包括绝缘基体，第一集流件和第二集流件连接于绝缘基体，且通过绝缘基体彼此绝缘。
该实施例中的集流组件采用整体式结构，简化了电池单体内部的电连接结构，可进一步节约电池单体的内部空间，降低重量，且节省零部件的生产成本；第一集流件和第二集流件通过绝缘基体承载，可提高整体刚性，不容易发生变形，安装稳定，从而，提高电连接可靠性。而且，此种设计还可降低装配难度，无需将第一集流件、第二集流件和绝缘基体分别安装，对横截面尺寸较小的电池单体有更加明显的优势，可提高装配效率。另外，第一集流件和第二集流件通过与之集成为一体的绝缘基体实现彼此绝缘，可提高绝缘可靠性，减少由于装配误差或振动影响绝缘性能，从而提高电池单体工作的可靠性和安全性。
在一些实施例中，第一集流件、第二集流件和绝缘基体一体注塑成型。
该实施例通过一体注塑成型的方式可降低集流组件中各部件的加工和装配难度，从而提高电池单体的生产效率，而且便于在第一集流件和第二集流件与绝缘基体之间设置凹凸配合结构，以增加与绝缘基体的结合强度，从而提高第一集流件和第二集流件设置于绝缘基体的牢固性。
在一些实施例中，绝缘基体包括第一绝缘部，第一绝缘部具有第一开口和第二开口，第一集流件的至少部分容纳于第一开口，第二集流件的至少部分容纳于第二开口；
第一绝缘部的部分位于第一开口与第二开口之间，并用于隔开第一集流件和第二集流件。
该实施例通过将第一集流件的至少部分容纳于第一开口内，并将第二集流件的至少部分容纳于第二开口内，可使集流件更好地与绝缘基体连接，实现可靠固定，且能减小电池单体在高度方向上的尺寸，从而减小电池单体的体积，提高能量密度。而且，第一绝缘部的部分位于第一开口和第二开口之间，能够对第一集流件和第二集流件起到绝缘作用，提高绝缘可靠性。
在一些实施例中，第一开口内侧壁上设有第二凹槽，第一集流件与第一开口配合的外侧壁上设有凸起，凸起嵌入第二凹槽内，以使第一集流件与绝缘基体结合；和/或
第二开口内侧壁上设有第二凹槽，第二集流件与第二开口配合的外侧壁上设有凸起，凸起嵌入第二凹槽内，以使第二集流件与绝缘基体结合。
该实施例通过将第一集流件的至少部分容纳于第一开口内，并将第二集流件的至少部分容纳于第二开口内，可使集流件更好地与绝缘基体连接，实现可靠固定，且能减小电池单体在高度方向上的尺寸，从而减小电池单体的体积，提高能量密度。而且，第一绝缘部的部分位于第一开口和第二开口之间，能够对第一集流件和第二集流件起到绝缘作用，提高绝缘可靠性。
在一些实施例中，凸起上设有第一通孔，绝缘基体上设有限位柱，限位柱嵌入第一通孔。
该实施例通过在凸起上设有第一通孔，在使绝缘基体、第一集流件和第二集流件通过注塑成型时，可进一步增加集流件与绝缘基体的结合力，使第一集流件和第二集流件与绝缘基体的固定更加牢固。
在一些实施例中，电池单体还包括：绝缘片，设在第二集流件与第一电极引出部之间。
该实施例采用绝缘片将极性相反的第二集流件和第一电极引出部隔开，可保证绝缘性能，防止发生短路，从而提高电池单体工作的可靠性和安全性。
在一些实施例中，电池单体还包括：间隔片，设在第一集流件与第一电极引出部之间，间隔片与绝缘片各自朝向端盖组件的表面平齐，且不低于第一绝缘部的表面。
该实施例设置间隔片，并使间隔片与绝缘片相互平齐，可使端盖组件与集流组件之间均衡接触，有利于提高整体结构刚度，并使集流组件受力均匀，能够防止集流组件在受到振动或冲击时发生位置错动或变形，保证电连接稳定性，从而提高电池单体工作的可靠性和安全性。
在一些实施例中，第一集流件靠近容纳部的边缘被绝缘基体包围。
该实施例通过绝缘基体将第一集流件靠近容纳部的边缘包围，能够保证第一集流件与容纳部之间可靠绝缘，即使在电池单体受到振动或冲击时，第一集流件与容纳部也无法直接接触，可防止不同极性的第一集流件与容纳部发生短路，从而提高电池单体工作的可靠性和安全性。
在一些实施例中，端盖组件还包括第一绝缘件，第一绝缘件设在端盖本体与集流组件之间，第一绝缘件最靠近电极组件的端面和第一电极引出部最靠近电极组件的端面齐平。
该实施例可通过集流组件同时对第一绝缘件和第一电极引出部提供支撑，提高整体结构的稳固性，保持第一电极引出部位置稳定，并减少集流组件的变形量，由此可提高电池单体内部电连接的可靠性。
在一些实施例中，绝缘基体包括第一绝缘部和连接于第一绝缘部的第二绝缘部，第一绝缘部具有第一开口，第一集流件包括：
第一部，与第一开口配合，且与第一极耳电连接；和
第二部，连接于第一部且搭接于第二绝缘部，第二部与第一电极引出部电连接。
该实施例中的第一集流件包括第一部和第二部，可使第一极耳和第一电极引出部分别连接于第一集流件上不同的区域，可防止多次重复焊接造成第一集流件发生变形和破坏，能够提高焊接可靠性；而且，第二部搭接于第二绝缘部，能为第二部提供稳定的支撑，防止第二部发生变形；此外，通过设置第二绝缘部可实现第一集流件与第二极耳之间的绝缘，提高绝缘可靠性，防止电池单体在工作过程中发生短路。
在一些实施例中，第一电极引出部设在端盖本体的中心区域，第二绝缘部设在第一绝缘部的中心区域。
该实施例将第一电极引出部设在端盖本体的中心区域，利于增大第一电极引出部的横截面积，不仅方便实现电连接，也能提高过流能力；而且，便于通过汇流件连接一个电池单体的第一电极引出部和相邻电池单体的第二电极引出部，利于增大汇流件的宽度，提高过流能力。
在一些实施例中，第一电极引出部与第二集流件在容纳部的横截面内的投影具有重叠区域，第二绝缘部相对于第一绝缘部朝向第一电极引出部凸出，第二部相对于第一部朝向第一电极引出部凸出。
该实施例考虑到在第一电极引出部与第二集流件具有重叠区域的情况下，为了实现第二部与第一电极引出部电连接，第二部与第二集流件距离较近，容易发生短路，通 过使第二绝缘部相对于第一绝缘部朝向第一电极引出部凸出，可使第二部在高度方向上与第二集流件与第二极耳连接的部分错开，以防止第二部与第二集流件之间发生短路，提高绝缘可靠性。
在一些实施例中，第一电极引出部的内端面设有第一凹槽，第二部的至少部分位于第一凹槽内。
该实施例在第一电极引出部的内端面设有第一凹槽，并使第二部的至少部分位于第一凹槽内，可减小集流组件的占用高度，从而减低电池单体的高度。而且，此种结构可通过集流组件同时对第一绝缘件和第一电极引出部提供支撑，提高整体结构的稳固性，保持第一电极引出部位置稳定，从而提高电池单体内部电连接的可靠性。
在一些实施例中，端盖组件还包括第一绝缘件，第一绝缘件设在端盖本体与集流组件之间，第一绝缘件覆盖第一电极引出部内端面的径向外侧区域，且与第一电极引出部的内端面形成第一凹槽，第二部的至少部分位于第一凹槽内。
该实施例无需在第一电极引出部的内端面加工第一凹槽，可降低第一电极引出部的加工难度，而且集流组件仅需对第一绝缘件提供支撑，无需考虑第一绝缘件最靠近电极组件的端面与第一电极引出部最靠近电极组件的端面之间的对齐问题，可降低对零部件加工精度的要求。
在一些实施例中，第一凹槽的深度不超过第二部相对于第一部的凸起高度。
该实施例能够在第一凹槽存在加工误差，或者第二部相对于第一部的凸出高度存在误差时，也能使第二部与第一凹槽的槽底可靠接触，避免第二部与第一电极引出部之间出现装配间隙，可保证第一电极引出部与第二部电连接的可靠性。
在一些实施例中，第二绝缘部位于第一开口以外的侧壁超出第二部的外侧壁。
该实施例使第二绝缘部的侧壁超出第二部的外侧壁，能够将第二部与第二集流件隔开，避免第二部与第二集流件接触，可保证绝缘可靠性，从而提高电池单体工作的可靠性和安全性。
在一些实施例中，第一部远离第二部的至少一个角部设有第一缺口，被配置为与注塑模具中的第一定位部配合实现第一集流件的定位。
该实施例能够在通过注塑形成集流组件时，通过第一缺口对第一集流件进行定位，以提高第一集流件的位置精度；而且，由于第一集流件的内边缘处周向尺寸较小，为过流面积瓶颈区域，将第一缺口设在第一部远离第二部的角部，不影响第一集流件的过流能力。
在一些实施例中，绝缘基体包括第一绝缘部，第一绝缘部具有第二开口，第二集 流件包括：
第三部，与第二开口配合，且与第二极耳电连接；和
第四部，至少部分连接于第三部靠近容纳部的边缘，且第四部与端盖本体电连接。
该实施例的第二集流件加工方便，在与绝缘基体集成后，可方便地通过第四部与端盖本体直接或间接地电连接，从而实现第二极耳与作为第二电极引出部的端盖本体电连接。
在一些实施例中，第三部远离第四部的至少一个角部设有第二缺口，被配置为与注塑模具中的第二定位部配合实现第二集流件的定位。
该实施例能够在通过注塑形成集流组件时，通过第二缺口对第二集流件进行定位，以提高第二集流件的位置精度；而且，由于第二集流件的外边缘设有弯折的第四部，将第二缺口设在第三部远离第四部的角部，方便第二缺口的加工，也方便对第二集流件进行定位。
在一些实施例中，第四部在容纳部周向上的延伸长度不超出第三部靠近容纳部的边缘。
该实施例能够降低第二集流件的加工难度，可直接通过薄板结构弯折成型，从而提高第二集流件的整体结构强度，并提高第三部和第四部之间的连接可靠性。
在一些实施例中，第四部沿容纳部的整个周向延伸。
该实施例使第四部沿容纳部的整个周向延伸，能够增加第四部与端盖本体直接或间接电连接的长度，可提高连接可靠性，并增加过流能力。
在一些实施例中，第四部与第三部成角度设置。
该实施例使第四部与第三部成角度设置，可增加第四部与容纳部的侧壁或端盖本体电连接的面积，便于通过焊接实现电连接，还可提高电连接可靠性。
在一些实施例中，第四部朝向靠近端盖组件的方向延伸。
该实施例使第四部朝向远离电极组件的方向延伸，可防止第四部在振动或冲击情况下插入电极组件的极片之间造成活性物质脱落，还可防止第四部与极性相反的极片接触而发生短路，提高绝缘可靠性；而且，第四部更靠近容纳部的开口，更方便从开口处将第四部焊接于容纳部的侧壁，可提高焊接质量。
在一些实施例中，容纳部具有侧壁，端盖组件还包括第一绝缘件，第一绝缘件设在端盖本体与集流组件之间，第一绝缘件与侧壁之间至少在对应于第四部的区域具有第一间隙，第四部位于第一间隙内。
该实施例使第四部位于第一绝缘件与容纳部之间的第一间隙内，可与第一绝缘件 共用空间，第四部的内侧通过第一绝缘件进行绝缘；而且，可防止第四部在振动或冲击情况下插入电极组件的极片之间造成活性物质脱落，还可防止第四部与极性相反的极片接触而发生短路，提高绝缘可靠性；此外，第四部更靠近容纳部的开口，更方便从开口处将第四部焊接于容纳部的侧壁，在采用焊接时，可从容纳部内侧焊接第四部与侧壁，可提高焊接质量，或者便于直接将第四部与端盖本体电连接。
在一些实施例中，壳体呈圆柱形，第一绝缘件呈圆环状，第一绝缘件的外径为d，端盖本体的外径为D，第四部的厚度为δ，d≤D-2*δ。
该实施例将第一绝缘件的外壁设置为圆周面，方便加工，而且在装配第一绝缘件所在的端盖组件时，无需使第一绝缘件与第四部进行周向对准，方便装配，可提高装配效率。
在一些实施例中，容纳部具有侧壁，第二集流件通过侧壁与端盖本体电连接。
该实施例中第二集流件通过侧壁与端盖本体电连接，可降低对第二集流件外端连接部分长度的要求，还可降低对端盖本体结构的要求，端盖本体可设计为平板结构，无需考虑与第二集流件的连接问题，可简化端盖本体的结构，降低制造难度。
在一些实施例中，端盖本体具有弯折部，弯折部朝向端盖本体内侧凸出，且靠近容纳部设置，第二集流件与弯折部电连接。
该实施例将第二集流件通过弯折部与端盖本体电连接，可增加第二集流件与端盖本体的接触面积，例如在采用焊接实现电连接时，既能提高连接可靠性，又能增加接触面积。而且，此种结构也适用于容纳部与端盖本体之间绝缘的情况，或者在端盖本体与容纳部之间出现焊缝脱落的情况下，第二集流件也能可靠地将电能输出至端盖本体。此外还可解决容纳部和端盖本体较薄影响过流能力的问题。
在一些实施例中，弯折部与容纳部之间具有第二间隙，第二集流件的外端位于第二间隙内。
该实施例将第二集流件与弯折部朝向容纳部的侧壁接触，方便通过焊接实现电连接，而且也利于增大第二集流件与弯折部之间电连接的面积，提高电连接可靠性，并保持第二集流件位置稳定。
在一些实施例中，第一极耳和第二极耳沿电极组件的周向间隔设置。
该实施例中第一极耳和第二极耳的设置方式，既能从空间上更好地将不同极性的极耳隔开，又能使电解液通过间隔区域浸润到电极主体内部，以在电池单体充放电的过程中，使电解液与极片上的活性物质充分发生反应。
在一些实施例中，第一集流件与第一极耳连接部分的形状与第一极耳的端面形状 相同；和/或第二集流件与第二极耳连接部分的形状与第二极耳的端面形状相同。
该实施例有利于使第一极耳和/或第二极耳的整个端面都能与对应的集流件电连接，能够保证电流传输能力；在此基础上，还能减少集流件的多余面积，节省材料。
在一些实施例中，第一集流件与第一极耳连接的部分覆盖第一极耳；和/或第二集流件与第二极耳连接的部分覆盖第二极耳。
该实施例能够使第一极耳和/或第二极耳的整个端面都能与对应的集流件电连接，能够保证电流传输能力。
在一些实施例中，电极组件呈卷绕结构，第一极耳和第二极耳中的至少一个沿卷绕结构的径向从中心向外侧宽度逐渐增大。
该实施例可使第一极耳中每组相邻层第一极耳部间距均匀分布，或使第二极耳中每组相邻层第二极耳部间距均匀分布；而且，通过增加外层区域极耳沿卷绕方向的宽度，能够增加极耳与集流件连接时的有效接触面积，可增加过流能力，从而提高电池单体的性能。
根据本申请的第二方面，提供了一种电池，包括上述实施例的电池单体。
在一些实施例中，电池单体设有至少两个，电池还包括汇流件，汇流件的第一端连接于其中一个电池单体的第一电极引出部，汇流件的第二端连接于另一个电池单体的第二电极引出部。
该实施例可方便地实现多个电池单体的电连接。
在一些实施例中，壳体包括：
容纳部，具有开口；和
端盖组件，封闭开口，端盖组件包括端盖本体和绝缘设置于端盖本体的第一电极引出部；
其中，汇流件的第二端连接于端盖本体。
该实施例可方便地实现多个电池单体的电连接，允许多个电池单体的布局更紧凑，且利于增大汇流件的宽度，提高过流能力。
根据本申请的第三方面，提供了一种用电装置，包括上述实施例的电池单体和/或电池，用于为用电装置提供电能。
根据本申请得第四方面，提供了一种电池单体的制造方法，包括以下步骤：
提供壳体：提供壳体，壳体设有极性相反的第一电极引出部和第二电极引出部；
装配电极：提供电极组件并放置于壳体内，电极组件包括电极主体、第一极耳和第二极耳，第一极耳和第二极耳从电极主体的同侧引出；和
电连接：将集流组件设于电极主体靠近第一极耳和第二极耳的一侧，集流组件包括第一集流件和第二集流件，并通过第一集流件将第一极耳和第一电极引出部电连接，通过第二集流件将第二极耳和第二电极引出部电连接。
在一些实施例中，壳体包括容纳部和端盖组件，容纳部具有开口，端盖组件封闭开口，端盖组件包括端盖本体和绝缘设置于端盖本体的第一电极引出部，端盖本体作为第二电极引出部；电连接步骤包括：
将第一极耳和第二极耳分别与第一集流件和第二集流件焊接；
将第二集流件与端盖本体电连接；
使端盖本体封闭开口；
将第一集流件与第一电极引出部从端盖组件外部焊接。
在一些实施例中，容纳部具有侧壁，容纳部与端盖本体电连接，将第二集流件与端盖本体电连接的步骤包括：
使第二集流件与侧壁电连接，使侧壁与端盖本体电连接。
在一些实施例中，第二集流件与侧壁从容纳部的内侧焊接。
在一些实施例中，第二集流件包括：第三部，与第二极耳电连接；和第四部，至少连接于第三部靠近容纳部的边缘，第四部与侧壁电连接；制造方法还包括：
在将集流组件放入容纳部前，第四部与第三部之间呈钝角。
附图说明
为了更清楚地说明本申请实施例的技术方案，下面将对本申请实施例中所需要使用的附图作简单地介绍，显而易见地，下面所描述的附图仅仅是本申请的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据附图获得其他的附图。
图1为本申请将电池安装于车辆的一些实施例的结构示意图。
图2为本申请电池的第一实施例的分解图。
图3为本申请电池单体的一些实施例的外形图。
图4为本申请电池单体的第一实施例的分解图。
图5为本申请电池单体的第一实施例的剖视图。
图6为图5中端盖组件的一些实施例的结构示意图。
图7和图8分别为图5中的A处和B处放大图。
图9为图4中集流组件的一些实施例的结构示意图。
图10为图9所示集流组件的分解图。
图11A和图11B分别为图4中集流组件的主视图和C-C剖视图。
图12A和图12B分别为图4中第一集流件的主视图和D-D剖视图。
图13A和图13B分别为图4中第二集流件的主视图和E-E剖视图。
图14为图4中集流组件在横截面内的剖视图。
图15为本申请电池单体的第二实施例的分解图。
图16为图15中集流组件的一些实施例的结构示意图。
图17为图16中的F-F剖视图。
图18为本申请电池单体的第二实施例的剖视图。
图19为图18中的G处放大图。
图20为图15中第一绝缘件的剖视图。
图21为电池中多个电池单体电连接的一些实施例的结构示意图。
在附图中，附图并未按照实际的比例绘制。
标记说明：
100、电池单体；10、壳体；
1、容纳部；11、侧壁；111、开口；12、端壁；
2、端盖组件；21、端盖本体；211、第二通孔；212、弯折部；22、第一电极引出部；221、第一段；222、第二段；223、第三段；224、第一凹槽；225、第二凹槽；226、第三凹槽；227、注液孔；23、第一绝缘件；231、第四凹槽；232、第五凹槽；233、环状部；234、第一延伸部；235、第二延伸部；24、密封件；25、第二绝缘件；26、密封盖；
3、电极组件；31、电极主体；311、中心孔；32、第一极耳；33、第二极耳；
4、集流组件；41、绝缘基体；411、第一绝缘部；412、第二绝缘部；412’、第三通孔；413、第一开口；414、第二开口；415、第二凹槽；416、限位柱；42、第一集流件；421、第一部；422、第二部；422’、第四通孔；422A、第一圆弧段；422B、第二圆弧段；422C、直壁段；423、凸起；424、第一通孔；425、第一缺口；426、连接部；43、第二集流件；431、第三部；432、第四部；433、第二缺口；
5、间隔片；6、绝缘片；
200、电池；201、箱体组件；201A、主体部；201B、第一盖体；201C、第二盖体；202、汇流件；
300、车辆；301、车桥；302、车轮；303、马达；304、控制器。
具体实施方式
下面结合附图和实施例对本申请的实施方式作进一步详细描述。以下实施例的详细描述和附图用于示例性地说明本申请的原理，但不能用来限制本申请的范围，即本申请不限于所描述的实施例。
在本申请实施例的描述中，术语“多个”指的是两个以上(包括两个)，同理，“多组”指的是两组以上(包括两组)，“多片”指的是两片以上(包括两片)。
本申请采用了“上”、“下”、“顶”、“底”、“前”、“后”、“内”和“外”等指示的方位或位置关系的描述，这仅是为了便于描述本申请，而不是指示或暗示所指的装置必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本申请保护范围的限制。
此外，术语“第一”、“第二”、“第三”等仅用于描述目的，而不能理解为指示或暗示相对重要性。“垂直”并不是严格意义上的垂直，而是在误差允许范围之内。“平行”并不是严格意义上的平行，而是在误差允许范围之内。下述描述中出现的方位词均为图中示出的方向，并不是对本申请的具体结构进行限定。
在本申请的描述中，还需要说明的是，除非另有明确的规定和限定，术语“安装”、“相连”、“连接”应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或一体地连接；可以是直接相连，也可以通过中间媒介间接相连。对于本领域的普通技术人员而言，可视具体情况理解上述术语在本申请中的具体含义。
在本文中提及“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些实施例中。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。本领域技术人员显式地和隐式地理解的是，本文所描述的实施例可以与其它实施例相结合。
电池单体可以包括锂离子二次电池、锂离子一次电池、锂硫电池、钠锂离子电池、钠离子电池或镁离子电池等，本申请实施例对此并不限定。电池单体可呈圆柱体、扁平体、长方体或其它形状等，本申请实施例对此也不限定。电池单体一般按封装的方式分成三种：柱形电池单体、方形电池单体和软包电池单体，本申请实施例对此也不限定。
目前的电池单体通常包括壳体和容纳于壳体内的电极组件，并在壳体内填充电解质。电极组件主要由极性相反的第一极片和第二极片层叠或卷绕形成，并且通常在第一极片与第二极片之间设有绝缘件，例如隔膜等。第一极片和第二极片涂覆有活性物质的部分构成电极组件的主体部，第一极片和第二极片未涂覆活性物质的部分各自构成第一 极耳和第二极耳。在锂离子电池中，第一极片可以为正极极片，包括正极集流件和设于正极集流件两侧的正极活性物质层，正极集流件的材料例如可以为铝，正极活性物质例如可以为钴酸锂、磷酸铁锂、三元锂或锰酸锂等；第二极片可以为负极极片，包括负极集流件和设于负极集流件两侧的负极活性物质层，负极集流件的材料例如可以为铜，负极活性物质例如可以为石墨或硅等。可选地，第一极片也可以为负极极片，相应地第二极片为正极极片。第一极耳和第二极耳可以共同位于主体部的一端或是分别位于主体部的两端。在电池单体的充放电过程中，正极活性物质和负极活性物质与电解液发生反应，极耳连接端子以形成电流回路。
发明人通过研究发现，目前的电池单体通常设有极性相反的第一电极引出部和第二电极引出部，用于接入用电回路进行供电，第一极耳与第一电极引出部电连接，第二极耳与第二电极引出部电连接。例如，对于圆柱形电池单体，由于电池单体端部面积较小，第一电极引出部和第二电极引出部分别设在电池单体的两端，相应地，第一极耳和第二极耳分别从电极组件的两端引出。发明人在实践中发现，每一端的极耳和电极端子都会占用一定空间用于电连接，需要在电池单体的高度方向消耗更多的空间，造成电池单体整体体积增大，且会影响电池单体的整体能量密度。
为了解决上述问题，发明人欲从优化电池单体内部结构为出发点，并主要改进极耳的引出方式，以降低电池单体的高度，从而提高能量密度。
基于此种改进思路，本申请的实施例提出了一种电池单体，电池单体包括壳体，设有极性相反的第一电极引出部和第二电极引出部；电极组件，设在壳体内，电极组件包括电极主体以及从电极主体同侧引出的第一极耳和第二极耳；集流组件，设于电极组件靠近第一极耳和第二极耳的一侧，集流组件包括第一集流件和第二集流件，第一集流件将第一极耳和第一电极引出部电连接，第二集流件将第二极耳和第二电极引出部电连接。
此种电池单体将第一极耳和第二极耳从电极主体的同侧引出，将第一极耳和第二极耳从电极主体的同一端引出，只需要在电极组件的一端预留电连接空间，无需在电池单体的两端分别设置电极引出部，可有效提高电池单体的整体能量密度，在电池单体的容量一定的情况下，能够减小电池单体的体积，使电池更容易安装于高度空间有限的用电装置中；或者在电池单体的体积一定的情况下，能够提高容量，延长电池的续航能力。
本申请实施例的电池单体适用于电池以及使用这种电池单体的用电装置，电池也适用于用电装置。
本申请实施例的电池可用于用电装置。用电装置可以是电瓶车、电动汽车、轮船 或航天器等等，例如，航天器包括飞机、火箭、航天飞机和宇宙飞船等等。
如图1所示，用电装置可以是车辆300，例如新能源汽车，新能源汽车可以是纯电动汽车、混合动力汽车或增程式汽车等；或者用电装置也可以是无人机或轮船等。具体地，车辆300可包括车桥301、连接于车桥301的车轮302、马达303、控制器304和电池200，马达303用于驱动车桥301转动，控制器304用于控制马达303工作，电池200可以设置在车辆300的底部、头部或尾部，用于为马达303以及车辆中其它部件的工作提供电能。
如图2所示，电池200包括箱体组件201和电池单体100。在电池200中，电池单体100可以是一个，也可以是多个。若电池单体100为多个，多个电池单体100之间可串联或并联或混联，混联是指多个电池单体100中既有串联又有并联，可以是多个电池单体100先串联或并联或混联组成电池模块，多个电池模块再串联或并联或混联形成一个整体，并容纳于箱体组件201内。也可以是所有电池单体100之间直接串联或并联或混联在一起，再将所有电池单体100构成的整体容纳于箱体组件201内。
其中，箱体组件201既可以是电池包的一部分，箱体组件201可拆卸地安装于用电装置；或者，箱体组件201也可以是用电装置中的结构件形成的用于容纳电池单体100的空间，例如，电池单体100用于车辆300时，箱体组件201为车架形成的用于容纳电池单体100的空间。
箱体组件201内部中空，用于容纳一个或多个电池单体100，根据所容纳电池单体100的形状、数量、组合方式以及其他要求，箱体组件201也可以具有不同形状的尺寸。例如，箱体组件201可包括：主体部201A、第一盖体201B和第二盖体201C，主体部201A相对的两端均具有开口，第一盖体201B和第二盖体201C分别用于封闭主体部201A的两端开口，图2中根据多个电池单体100的排列方式，主体部201A呈矩形筒状结构。
图3为电池单体100的一些实施例的外形示意图。电池单体100包括壳体10，壳体10可包括容纳部1和端盖组件2，容纳部1具有开口，端盖组件2封闭开口，并与容纳部1连接形成壳体10。端盖组件2包括端盖本体21和第一电极引出部22，第一电极引出部22设在端盖本体21上。图3中示意出了圆柱形电池单体100，后续实施例也主要也圆柱形电池单体100为例进行说明，当然本申请的电池单体100也可以是扁平体、长方体或其它形状等。
如图4为电池单体100的第一实施例的分解图，图5为电池单体100的纵向剖视图。在一些实施例中，电池单体100包括：壳体10、电极组件3和集流组件4。其中，壳 体10设有极性相反的第一电极引出部22和第二电极引出部；电极组件3，设在壳体10内，电极组件3包括电极主体31以及从电极主体31同侧引出的第一极耳32和第二极耳33；集流组件4，设于电极主体31靠近第一极耳32和第二极耳33的一侧，集流组件4包括第一集流件42和第二集流件43，第一集流件42将第一极耳32和第一电极引出部22电连接，第二集流件43将第二极耳33和第二电极引出部电连接。
其中，壳体10为中空结构，用于容纳电极组件3，壳体10内填充电解液。第一电极引出部22和第二电极引出部用于输入或输出电能，第一极耳32通过第一集流件42与第一电极引出部22电连接，第二极耳33通过第二集流件43与第二电极引出部电连接。
可选地，第一电极引出部22和第二电极引出部均可以为电极端子。电极端子可设计为极柱，极柱可呈圆柱形、方形柱状结构，或者也可呈其它形状的柱体结构。第一电极引出部22和第二电极引出部均与壳体10绝缘。例如，第一电极引出部22为正极端子，第二电极引出部为负极端子；或者第一电极引出部22为负极端子，第二电极引出部为正极端子。例如，第一电极引出部22和/或第二电极引出部的至少部分凸出于壳体10的外壁，以便于通过汇流件实现不同电池单体100之间的电连接。
可选地，第一电极引出部22为电极端子，第二电极引出部为壳体10的端盖本体21，端盖本体21上可设置第二通孔211，电极端子安装于第二通孔211。可选地，第一电极引出部22用于引出电极组件3的正极电能，第二电极引出部用于引出电极组件3的负极电能；或者第一电极引出部22用于引出电极组件3的负极电能，第二电极引出部用于引出电极组件3的正极电能。
电极组件3包括极性相反的第一极片和第二极片，第一极片和第二极片可绕卷绕轴线K卷绕形成。对于圆柱形电池单体100，电极组件3呈圆柱形；对于方形电池单体100，电极组件3呈扁平状。第一极耳32和第二极耳33位于电极组件3沿卷绕轴线K的同一端，且靠近第一电极引出部22和第二电极引出部中的电极端子设置。可选地，第一极耳32为正极极耳，第二极耳33为负极极耳；第一极耳32为负极极耳，第二极耳33为正极极耳。
集流组件4设在极耳与壳体10朝向极耳的壁之间，用于实现同极性的极耳与电极引出部之间的电连接。第一集流件42和第二集流件43可采用导电材料，例如金属材料，正极集流件可采用铝材料，负极集流件可采用铜材料，集流件与相应的极耳采用同种材料便于焊接，减少焊接裂纹。
该实施例将第一极耳32和第二极耳33从电极主体31的同一端引出，只需要在电极组件3的一端预留电连接空间，无需在电池单体100的两端分别设置电极引出部，可有 效提高电池单体100的整体能量密度，在电池单体100的容量一定的情况下，能够减小电池单体100的体积，使电池200更容易安装于高度空间有限的用电装置中；或者在电池单体100的体积一定的情况下，能够提高容量，延长电池200的续航能力。
在一些实施例中，第一集流件42的至少部分抵接于第一极耳32背离述电极主体31的表面，第二集流件43的至少部分抵接于第二极耳33背离述电极主体31的表面。
其中，第一极耳32背离述电极主体31的表面为多层第一极耳部的外端共同形成的表面，为了提高第一集流件42与第一极耳32之间的电连接可靠性，可对第一极耳32的外端进行揉平以增加接触面积。第二极耳33背离述电极主体31的表面为多层第二极耳部的外端共同形成的表面，为了提高第二集流件43与第二极耳33之间的电连接可靠性，可对第二极耳33的外端进行揉平以增加接触面积。
该实施例利于使第一集流件42与第一极耳32中的各层第一极耳部电连接，且第二集流件43与第二极耳33中的各层第二极耳部电连接提高集流件与相应极耳电连接的可靠性，并提高过流能力。
在一些实施例中，如图4和图5所示，壳体10包括容纳部1和端盖组件2，容纳部1具有开口111，端盖组件2封闭开口111，且端盖组件2包括端盖本体21和绝缘设置于端盖本体21的第一电极引出部22，且端盖本体21作为第二电极引出部；其中，第二集流件43与端盖本体21电连接。
其中，端盖本体21上设有第二通孔211，第一电极引出部22设在第二通孔211内，第一电极引出部22可设在端盖本体21的中心区域，或者也可偏离端盖本体21的中心设置。为了实现第一电极引出部22与端盖本体21的绝缘，端盖组件2还包括：密封件24和第二绝缘件25，密封件24和第二绝缘件25共同包围第二通孔211的内壁以及端盖本体21上邻接第二通孔211的区域。
例如，密封件24可采用橡胶材料，第二绝缘件25可采用塑胶材料。
例如，密封件24和第二绝缘件25均呈环形，其横截面均为L形。如图6所示，密封件24的横部与端盖本体21的内壁贴合，竖部伸入第二通孔211，并与第二通孔211的侧壁贴合；第二绝缘件25的横部与端盖本体21的外壁贴合，竖部伸入第二通孔211，并与第二通孔211的侧壁贴合，密封件24和第二绝缘件25各自的竖部相互抵接。例如，密封件24和第二绝缘件25均呈圆环形。
端盖本体21采用金属材料制成，将其作为第二电极引出部，可省去一个电极端子。例如，容纳部1的开口111处与端盖本体21的外边缘可采用焊接固定，由于第一电极引出部22与端盖本体21之间绝缘，也就实现了第一电极引出部22与第二电极引出部 的绝缘。较优地，第一电极引出部22为正极，第二电极引出部为负极，因为电极端子一般采用铝材料制成，若其对应的第一集流件42也采用铝材料，就可实现同种材料的焊接，无需将电极端子设计为铜铝组合的结构，可简化电极端子的结构，并降低成本。可选地，第一电极引出部22为负极，第二电极部为正极。
该实施例中的第一电极引出部22为电极端子，第二电极引出部为端盖本体21，可省去一个电极端子，能够简化电池单体100的结构，降低装配难度，节约成本。由于端盖本体21上只需设置一个电极端子，有利于增加电极端子横截面积以增加过流能力，且可在端盖本体21上省出更多的空间走线或布置采温部件等。而且，容纳部1具有较大的表面积，可提高过流能力，也便于与第二集流件43焊接。此外，将端盖本体21作为第二电极引出部，与容纳部1的侧壁11作为第二引出部相比，可避免汇流件占用相邻电池单体100之间的空间，利于减小相邻电池单体100之间的间距，可使电池200中多个电池单体100的布局更紧凑，从而提高电池200的能量密度。
在一些实施例中，如图9所示，集流组件4还包括绝缘基体41，所述第一集流件42和所述第二集流件43连接于所述绝缘基体41，且通过所述绝缘基体41彼此绝缘。
其中，绝缘基体41、第一集流件42和第二集流件43集成为一体结构，绝缘基体41不仅作为第一集流件42和第二集流件43的固定基体，而且使第一集流件42和第二集流件43之间可靠绝缘。可选地，绝缘基体41可采用绝缘材料制成，例如塑胶材料等。
该实施例中的集流组件4采用整体式结构，简化了电池单体100内部的电连接结构，可进一步节约电池单体100的内部空间，降低重量，且节省零部件的生产成本；第一集流件42和第二集流件43通过绝缘基体41承载，可提高整体刚性，不容易发生变形，安装稳定，从而，提高电连接可靠性。而且，此种设计还可降低装配难度，无需将第一集流件42、第二集流件43和绝缘基体41分别安装，对横截面尺寸较小的电池单体100有更加明显的优势，可提高装配效率。另外，第一集流件42和第二集流件43通过与之集成为一体的绝缘基体41实现彼此绝缘，可提高绝缘可靠性，减少由于装配误差或振动影响绝缘性能，从而提高电池单体100工作的可靠性和安全性。
在一些实施例中，绝缘基体41与第一集流件42和第二集流件43一体注塑成型。
例如，绝缘基体41可采用塑胶材质，不限于PE(聚乙烯)、LCP(液晶高分子聚合物)等热塑性和绝缘性较好的材质。在注塑时，可将第一集流件42和第二集流件43放在注塑模具中，倒入注塑液体，待液体凝固后形成绝缘基体41。
该实施例通过一体注塑成型的方式可降低集流组件4中各部件的加工和装配难度，从而提高电池单体100的生产效率，而且便于在第一集流件42和第二集流件43与绝缘基 体41之间设置凹凸配合结构，以增加与绝缘基体41的结合强度，从而提高第一集流件42和第二集流件43设置于绝缘基体41的牢固性。
在一些实施例中，如图10所示，绝缘基体41包括第一绝缘部411，第一绝缘部411具有第一开口413和第二开口414，第一集流件42的至少部分容纳于第一开口413，第二集流件43的至少部分容纳于第二开口414；第一绝缘部411的部分位于第一开口413与第二开口414之间，并用于隔开第一集流件42和第二集流件43。
其中，第一开口413和第二开口414贯通绝缘基体41。
该实施例通过将第一集流件42的至少部分容纳于第一开口413内，并将第二集流件43的至少部分容纳于第二开口414内，可使集流件更好地与绝缘基体41连接，实现可靠固定，且能减小电池单体100在高度方向上的尺寸，从而减小电池单体100的体积，提高能量密度。而且，第一绝缘部411的部分位于第一开口413和第二开口414之间，能够对第一集流件42和第二集流件43起到绝缘作用，提高绝缘可靠性。
在一些实施例中，如图10所示，第一开口413内侧壁上设有第二凹槽415，第一集流件42与第一开口413配合的外侧壁上设有凸起423，凸起423嵌入第二凹槽415内，以使第一集流件42与绝缘基体41结合；和/或第二开口414内侧壁上设有第二凹槽415，第二集流件43与第二开口414配合的外侧壁上设有凸起423，凸起423嵌入第二凹槽415内，以使第二集流件43与绝缘基体41结合。
其中，如图11A、11B、12A和12B所示，第一集流件42与第一开口413配合的部分为第一部421，第一部421可呈扇形结构，其外圆弧壁和两个侧壁的至少一个上可设置凸起423，凸起423的厚度可与第一部421一致，或者考虑到绝缘基体41的厚度较薄，为了在设置第二凹槽415后仍保证绝缘基体41的强度，也可使凸起423的厚度小于第一部421的厚度。设在第一部421的侧壁上的凸起423可以为矩形，凸起423的长度可小于侧壁的长度；设在第一部421的外圆弧壁上的凸起423可以为圆弧形，凸起423的长度可小于外圆弧壁的长度。第二凹槽415的形状和尺寸与凸起423适配。
如图13A和图13B，第二集流件43与第二开口414配合的部分为第三部431，第三部431可呈扇形结构，其两个侧壁的至少一个上可设置凸起423，凸起423的厚度可与第三部431一致，或者考虑到绝缘基体41的厚度较薄，为了在设置第二凹槽415后仍保证绝缘基体41的强度，也可使凸起423的厚度小于第三部431的厚度。
可选地，绝缘基体41、第一集流件42和第二集流件43通过注塑成型，第二凹槽415是在注塑过程中自然形成的。
该实施例通过在集流件上设置凸起423，在使绝缘基体41、第一集流件42和第 二集流件43通过注塑成型时，可增加集流件与绝缘基体41的结合力，使第一集流件42和第二集流件43与绝缘基体41的固定更加牢固，不仅能提高电连接可靠性，还能保证第一集流件42和第二集流件43之间的绝缘性。
在一些实施例中，如图14所示，凸起423上设有第一通孔424，绝缘基体41上设有限位柱416，限位柱416嵌入第一通孔424。
其中，第一通孔424可设置多个。可选地，绝缘基体41、第一集流件42和第二集流件43通过注塑成型，在注塑过程中，注塑液体会流入第一通孔424以形成限位柱416。
该实施例通过在凸起423上设有第一通孔424，在使绝缘基体41、第一集流件42和第二集流件43通过注塑成型时，可进一步增加集流件与绝缘基体41的结合力，使第一集流件42和第二集流件43与绝缘基体41的固定更加牢固。
在一些实施例中，如图7所示，电池单体100还包括：绝缘片6，设在第二集流件43与第一电极引出部22之间，以实现第二集流件43与第一电极引出部22的绝缘。
其中，为了使第一电极引出部22设在端盖本体21靠近中心的区域，第一电极引出部22与第二集流件43在容纳部1的横截面内的投影会具有重叠区域，容易导致第一电极引出部22与第二集流件43之间发生短路，为了提高绝缘可靠性，绝缘片6至少覆盖第二集流件43与第一电极引出部22正对的区域，为了进一步提高绝缘可靠性，绝缘片6可覆盖第二集流件43与第二极耳33连接的整个区域。
例如，第二极耳33的端面呈扇形，第二集流件43与第二极耳33电连接的部分呈扇形且覆盖整个第二极耳33，相应地，绝缘片6也呈扇形且覆盖第二集流件43与第二极耳33连接的整个区域。
例如，绝缘片6可采用PET等绝缘材料制成。
该实施例采用绝缘片6将极性相反的第二集流件43和第一电极引出部22隔开，可保证绝缘性能，防止发生短路，从而提高电池单体100工作的可靠性和安全性。
在一些实施例中，如图8所示，电池单体100还包括：间隔片5，设在第一集流件42与第一电极引出部22之间，间隔片5与绝缘片6各自朝向端盖组件2的表面平齐，且不低于第一绝缘部411的表面。
其中，间隔片5与绝缘片6相互平齐，可形成用于支撑端盖组件2的支撑平面，使端盖组件2与集流组件4之间均衡接触，防止端盖组件2与集流组件4之间在单侧出现悬空。具体地，端盖组件2还包括第一绝缘件23，设在端盖本体21与集流组件4之间，例如，第一绝缘件23可以为塑胶件，间隔片5与绝缘片6用于支撑第一绝缘件23，使第 一绝缘件23与集流组件4之间均衡接触。
较优地，间隔片5与绝缘片6各自朝向端盖组件2的表面与第一绝缘部411的表面平齐，间隔片5的厚度为第一绝缘部411的厚度减去第一集流件42的厚度，绝缘片6的厚度为第一绝缘部411的厚度减去第二集流件43的厚度，有利于使绝缘基体41、间隔片5和绝缘片6共同形成整体平面，以对端盖组件2提供更加稳定的支撑，而且也不会额外占用高度空间。
可选地，间隔片5与绝缘片6各自朝向端盖组件2的表面超出第一绝缘部411的表面，此种方式有利于增加集流件的厚度，在焊接时不容易穿透，且能提高过流能力，而且还有利于可靠地覆盖对应的集流件，降低外边缘的尺寸精度要求。此种结构中，间隔片5和绝缘片6与端盖组件2接触，第一绝缘部411与端盖组件2之间具有间隙。
可选地，间隔片5与绝缘片6各自朝向端盖组件2的表面低于第一绝缘部411的表面。此种结构中，第一绝缘部411与端盖组件2接触，间隔片5和绝缘片6与端盖组件2之间具有间隙。
例如，第一极耳32的端面呈扇形，第一集流件42与第一极耳32电连接的部分呈扇形且覆盖整个第一极耳32，相应地，间隔片5也呈扇形且覆盖第一集流件42与第一极耳32连接的整个区域。间隔片5与绝缘片6可设置为相同的形状，可减少零件的种类，并提高装配的便捷性。
间隔片5与绝缘片6可采用相同的材料，例如采用PET等绝缘材料制成。可选地，间隔片5也可采用导电材料制成。
该实施例设置间隔片5，并使间隔片5与绝缘片6相互平齐，可使端盖组件2与集流组件4之间均衡接触，有利于提高整体结构刚度，并使集流组件4受力均匀，能够防止集流组件4在受到振动或冲击时发生位置错动或变形，保证电连接稳定性，从而提高电池单体100工作的可靠性和安全性。
在一些实施例中，如图4所示，第一集流件42靠近容纳部1的边缘被绝缘基体41包围。
由于第一集流件42与容纳部1的极性不同，为了防止第一集流件42与容纳部1之间发生短路，第一集流件42与容纳部1的侧壁之间设有绝缘基体41，以将第一集流件42与容纳部1之间隔开。例如，电池单体100呈圆柱形，第一极耳32的端面呈扇形，第一集流件42与第一极耳32连接的部分也呈扇形，绝缘基体41与第一集流件42对应的外轮廓为圆弧段，绝缘基体41的圆弧段的半径大于第一集流件42的圆弧段的半径，使得第一集流件42的径向外缘被绝缘基体41包围。
该实施例通过绝缘基体41将第一集流件42靠近容纳部1的边缘包围，能够保证第一集流件42与容纳部1之间可靠绝缘，即使在电池单体100受到振动或冲击时，第一集流件42与容纳部1也无法直接接触，可防止不同极性的第一集流件42与容纳部1发生短路，从而提高电池单体100工作的可靠性和安全性。
在一些实施例中，如图6和图8所示，端盖组件2还包括第一绝缘件23，第一绝缘件23设在端盖本体21与集流组件4之间，第一绝缘件23最靠近电极组件3的端面和第一电极引出部22最靠近电极组件3的端面齐平。
其中，第一绝缘件23可采用塑胶材料，对于圆柱形电池单体100，第一绝缘件23为圆环状结构。较优地，第一绝缘件23靠近集流组件4的表面上设有第四凹槽231，第三段223位于第四凹槽231内，以使第一绝缘件23和第一电极引出部22各自朝向电极组件3的端面齐平，集流组件4可同时对第一绝缘件23和第一电极引出部22提供支撑。
可选地，在从端盖本体21至电极组件3的方向上，第一绝缘件23最靠近电极组件3的端面超出第一电极引出部22最靠近电极组件3的端面，此种结构既能保证对第一电极引出部22提供稳定的支撑，防止在受到振动或冲击的情况下造成第一电极引出部22与第一集流件42脱开，提高电连接的可靠性；而且还可避免由于第一绝缘件23凸出造成第一电极引出部22。
该实施例可通过集流组件4同时对第一绝缘件23和第一电极引出部22提供支撑，提高整体结构的稳固性，保持第一电极引出部22位置稳定，并减少集流组件4的变形量，由此可提高电池单体100内部电连接的可靠性。
在一些实施例中，如图9和图10所示，绝缘基体41包括第一绝缘部411和连接于第一绝缘部411的第二绝缘部412，第一绝缘部411具有第一开口413；第一集流件42包括：第一部421，与第一开口413配合，且与第一极耳32电连接；和第二部422，连接于第一部421且搭接于第二绝缘部412，第二部422与第一电极引出部22电连接。
其中，以圆柱形电池单体100为例，第一绝缘部411为圆形板状结构，第一绝缘部411上设有第一开口413和第二开口414。在一些实施例中，第一极耳32和第二极耳33呈扇形，且相对设置，相应地，第一开口413和第二开口414也呈扇形且相对设置，例如可相对于第一绝缘部411的中心位置对称，扇形开口在靠近圆心角的位置设有内圆弧壁，第一开口413的外圆弧壁与第一绝缘部411的外边缘之间具有预设距离，第二开口414贯通第一绝缘部411的外边缘。第二绝缘部412设在第一绝缘部411的中心区域，可以为圆盘状结构，第一开口413和第二开口414各自的内圆弧壁均与第二绝缘部412的外壁重合。可选地，第二绝缘部412也可相对于第一绝缘部411偏心设置。
第一集流件42包括第一部421和第二部422，第一部421设在第一开口413内，且与第一极耳32电连接，用于收集第一极耳32的电流，例如可通过焊接等方式实现电连接；第二部422从靠近第一电极引出部22的一侧搭接于第二绝缘部412，第二部422与第一电极引出部22电连接，例如可通过焊接等方式实现电连接。
第二绝缘部412的中心设有第三通孔412’，第二部422上设有第四通孔422’，第一电极引出部22上设有注液孔227，通过注液孔227注入的电解液可通过第四通孔422’和第三通孔412’进入电极组件3。
该实施例中的第一集流件42包括第一部421和第二部422，可使第一极耳32和第一电极引出部22分别连接于第一集流件42上不同的区域，可防止多次重复焊接造成第一集流件42发生变形和破坏，能够提高焊接可靠性；而且，第二部422搭接于第二绝缘部412，能为第二部422提供稳定的支撑，防止第二部422发生变形；此外，通过设置第二绝缘部412可实现第一集流件42与第二极耳33之间的绝缘，提高绝缘可靠性，防止电池单体100在工作过程中发生短路。
在一些实施例中，第一电极引出部22设在端盖本体21的中心区域，第二绝缘部412设在第一绝缘部411的中心区域。
该实施例将第一电极引出部22设在端盖本体21的中心区域，利于增大第一电极引出部22的横截面积，不仅方便实现电连接，也能提高过流能力；而且，便于通过汇流件连接一个电池单体100的第一电极引出部22和相邻电池单体100的第二电极引出部，利于增大汇流件的宽度，提高过流能力。
在一些实施例中，如图10，图11A和图11B所示，第一电极引出部22与第二集流件43在容纳部1的横截面内的投影具有重叠区域，第二绝缘部412相对于第一绝缘部411朝向第一电极引出部22凸出，第二部422相对于第一部421朝向第一电极引出部22凸出。
其中，第二绝缘部412朝向电极组件3的表面可与第一绝缘部411齐平，第二绝缘部412朝向第一集流件42的表面高于第一绝缘部411，相应地，第二部422也相对于第一部421朝向第一电极引出部22凸出。例如，第一部421和第二部422可通过一体式的薄板结构冲压形成。
第一集流件42可通过弯折或冲压的方式形成。第一集流件42可包括第一部421、第二部422和连接部426，连接部426连接于第一部421和第二部422之间，以实现第一部421和第二部422的高度差。可选地，第二部422与第一部421也可形成平板结构。
该实施例考虑到在第一电极引出部22与第二集流件43具有重叠区域的情况下， 为了实现第二部422与第一电极引出部22电连接，第二部422与第二集流件43距离较近，容易发生短路，通过使第二绝缘部412相对于第一绝缘部411朝向第一电极引出部22凸出，可使第二部422在高度方向上与第二集流件43与第二极耳33连接的部分错开，以防止第二部422与第二集流件43之间发生短路，提高绝缘可靠性。
在一些实施例中，如图6、图8和10所示的第一实施例，第一电极引出部22的内端面设有第一凹槽224，第二部422的至少部分位于第一凹槽224内。
可选地，凸出部分可全部位于第一凹槽224内，此种结构不仅能够最大限度地降低电池单体100的高度，还可通过集流组件4对端盖组件2提供稳定的支撑。可选地，凸出部分也可部分位于第一凹槽224内。第一凹槽224的直径f不小于第二部422的最大直径，以防止出现干涉。
具体地，如图6所示，端盖组件2可包括端盖本体21、第一电极引出部22、第一绝缘件23、密封件24和第二绝缘件25。
其中，第一电极引出部22包括第一段221、第二段222和第三段223，第二段222和第三段223分别连接于第一段221的两端，第二段222设在第二通孔211内，第二段222位于端盖本体21的外侧，第二段222与端盖本体21之间可设置第二绝缘件25，第三段223位于端盖本体21的内侧，第三段223与端盖本体21之间可设置密封件24，密封件24位于环形的第一绝缘件23内。第二段222和第三段223的直径均大于第一段221的直径。例如，第三段223的直径大于第二段222，以使第三段223可同时支撑第一绝缘件23和密封件24。第一绝缘件23靠近集流组件4的表面上设有第四凹槽231，第三段223位于第四凹槽231内。
第一电极引出部22的内表面设有第一凹槽224，第一电极引出部22的外表面设有第二凹槽225，第二凹槽225的底面设有第三凹槽226，由此，可减小第一电极引出部22的焊接厚度，可提高第一电极引出部22与第一集流件42之间电连接的可靠性。第三凹槽226的底面设有注液孔227，用于注入电解液。
该实施例在第一电极引出部22的内端面设有第一凹槽224，并使第二部422的至少部分位于第一凹槽224内，可减小集流组件4的占用高度，从而减低电池单体100的高度。而且，此种结构可通过集流组件4同时对第一绝缘件23和第一电极引出部22提供支撑，提高整体结构的稳固性，保持第一电极引出部22位置稳定，从而提高电池单体100内部电连接的可靠性。
在一些实施例中，如图18所示，端盖组件2还包括第一绝缘件23，第一绝缘件23设在端盖本体21与集流组件4之间，第一绝缘件23覆盖第一电极引出部22内端面的 径向外侧区域，且与第一电极引出部22的内端面形成第一凹槽224，第二部422的至少部分位于第一凹槽224内。
其中，密封件24和第二绝缘件25均呈环形，其横截面均为L形。密封件24的横部与端盖本体21的内壁贴合，竖部伸入第二通孔211，并与第二通孔211的侧壁贴合；第二绝缘件25的横部与端盖本体21的外壁贴合，竖部伸入第二通孔211，并与第二通孔211的侧壁贴合，密封件24和第二绝缘件25各自的竖部相互抵接。例如，密封件24和第二绝缘件25均呈圆环形。
第一电极引出部22包括第一段221、第二段222和第三段223，第二段222和第三段223分别连接于第一段221的两端，第一段221设在第二通孔211内，第二段222位于端盖本体21的外侧，第二绝缘件25设在第二段222与端盖本体21之间，第三段223位于端盖本体21的内侧，密封件24设在第三段223与端盖本体21之间且靠近第一段221设置。
如图20所示，第一绝缘件23包括环状部233、第一延伸部234和第二延伸部235，第一延伸部234从环状部233的内侧壁的顶端朝向径向内侧延伸，第二延伸部235从环状部233的内侧壁的底端朝向径向内侧延伸，且第三段223位于第一延伸部234和第二延伸部235间隔设置形成的空腔内，第一延伸部234覆盖第三段223顶面的径向外侧区域，且与密封件24抵接，第二延伸部235覆盖第三段223底面的径向外侧区域。
在该结构中，第二延伸部235与第一电极引出部22的内端面形成第一凹槽224，第二部422的至少部分位于第一凹槽224内。第一凹槽224的直径为D1，D1大于第二部422的最大外径。
该实施例无需在第一电极引出部22的内端面加工第一凹槽224，可降低第一电极引出部22的加工难度，而且集流组件4仅需对第一绝缘件23提供支撑，无需考虑第一绝缘件23最靠近电极组件3的端面与第一电极引出部22最靠近电极组件3的端面之间的对齐问题，可降低对零部件加工精度的要求。
在一些实施例中，如图6所示，第一凹槽224的深度c不超过第二部422相对于第一部421的凸起高度。由此，部分第二部422位于第一凹槽224内。
该实施例能够在第一凹槽224存在加工误差，或者第二部422相对于第一部421的凸出高度存在误差时，也能使第二部422与第一凹槽224的槽底可靠接触，避免第二部422与第一电极引出部22之间出现装配间隙，可保证第一电极引出部22与第二部422电连接的可靠性。
在一些实施例中，如图11A和图11B，第二绝缘部412位于第一开口413以外的 侧壁超出第二部422的外侧壁。
其中，第二绝缘部412为圆盘状，第二部422具有第一圆弧段422A、第二圆弧段422B和两个直壁段422C，第一圆弧段422A在第一部421上的投影与第一部421的内圆弧壁重合，第二圆弧段422B与第一圆弧段422A相对设置，第二圆弧段422B的两端分别通过一个直壁段422C与第一圆弧段422A的两端连接。第二绝缘部412的直径大于第二圆弧段422B的直径。
该实施例使第二绝缘部412的侧壁超出第二部422的外侧壁，能够将第二部422与第二集流件43隔开，避免第二部422与第二集流件43接触，可保证绝缘可靠性，从而提高电池单体100工作的可靠性和安全性。
在一些实施例中，如图12A和图12B所示，第一部421远离第二部422的至少一个角部设有第一缺口425，被配置为与注塑模具中的第一定位部配合实现第一集流件42的定位。
其中，若第一集流件42与绝缘基体41通过注塑形成一体，第一集流件42放置于注塑模具中时，为了对第一集流件42进行定位防止位置错动，第一集流件42的角部设有第一缺口425，注塑模具的底面设有第一定位部，第一定位部与第一缺口425配合，在注塑完成绝缘基体41固化后，可将集流组件4从注塑模具中取出，这样在第一缺口425处形成孔。为了提高定位可靠性，第一部421远离第二部422的两个角部分别一个第一缺口425。例如，第一缺口425可以为矩形、弧形等形状。例如，第一缺口425为0.5mm*0.6mm的矩形。
该实施例能够在通过注塑形成集流组件4时，通过第一缺口425对第一集流件42进行定位，以提高第一集流件42的位置精度；而且，由于第一集流件42的内边缘处周向尺寸较小，为过流面积瓶颈区域，将第一缺口425设在第一部421远离第二部422的角部，不影响第一集流件42的过流能力。
在一些实施例中，如图13A和图13B，绝缘基体41包括第一绝缘部411，第一绝缘部411具有第二开口414，第二集流件43包括：第三部431，与第二开口414配合，且与第二极耳33电连接；和第四部432，至少部分连接于第三部431靠近容纳部1的边缘，且第四部432与端盖本体21电连接。
其中，以圆柱形电池单体100为例，第一绝缘部411为圆形板状结构，第一绝缘部411上设有第一开口413和第二开口414。在一些实施例中，第一极耳32和第二极耳33呈扇形，且相对设置，相应地，第一开口413和第二开口414也呈扇形且相对设置，例如可相对于第一绝缘部411的中心位置对称，扇形开口在靠近圆心角的位置设有内圆弧 壁，第二开口414贯通第一绝缘部411的外边缘，第二开口414的内圆弧壁均与第二绝缘部412的外壁重合。
第二集流件43包括第三部431和第四部432，第三部431设在第二开口414内，且与第二极耳33电连接，用于收集第二极耳33的电流，例如可通过焊接等方式实现电连接；第四部432相对于第三部431朝向端盖本体21或者电极组件3弯折，第四部432与容纳部1的侧壁11或端盖本体21电连接，例如可通过焊接等方式实现电连接。第四部432的至少部分长度段沿着第三部431的外边缘延伸，可形成圆弧结构。
例如，第三部431和第四部432可通过一体式的薄板结构弯折形成，第三部431和第四部432厚度相等。可选地，第三部431和第四部432也可设计为厚度不同的结构。
该实施例的第二集流件43加工方便，在与绝缘基体41集成后，可方便地通过第四部432与端盖本体21直接或间接地电连接，从而实现第二极耳33与作为第二电极引出部的端盖本体21电连接。
在一些实施例中，第三部431远离第四部432的至少一个角部设有第二缺口433，被配置为与注塑模具中的第二定位部配合实现第二集流件43的定位。
其中，若第二集流件43与绝缘基体41通过注塑形成一体，第二集流件43放置于注塑模具中时，为了对第二集流件43进行定位防止位置错动，第二集流件43的角部设有第二缺口433，注塑模具的底面设有第二定位部，第二定位部与第二缺口433配合，在注塑完成绝缘基体41固化后，可将集流组件4从注塑模具中取出，这样在第二缺口433处形成孔。为了提高定位可靠性，第三部431远离第四部432的两个角部分别一个第二缺口433。例如，第二缺口433可以为矩形、弧形等形状。例如，第二缺口433为0.5mm*0.6mm的矩形。
该实施例能够在通过注塑形成集流组件4时，通过第二缺口433对第二集流件43进行定位，以提高第二集流件43的位置精度；而且，由于第二集流件43的外边缘设有弯折的第四部432，将第二缺口433设在第三部431远离第四部432的角部，方便第二缺口433的加工，也方便对第二集流件43进行定位。
在一些实施例中，如图10所示，第四部432在容纳部1周向上的延伸长度不超出第三部431靠近容纳部1的边缘。
其中，第四部432的延伸长度可与第三部431靠近容纳部1的边缘长度相等，此种结构可直接将薄板结构的外边缘弯折形成第四部432，加工简单，在此基础上还能最大限度地增加电连接长度，提高电连接可靠性和过流能力。或者，第四部432的延伸长度也可小于第三部431靠近容纳部1的边缘长度。可选地，第四部432也可通过焊接等方式与 第三部431连接。
该实施例能够降低第二集流件43的加工难度，可直接通过薄板结构弯折成型，从而提高第二集流件43的整体结构强度，并提高第三部431和第四部432之间的连接可靠性。
在一些实施例中，如图15至图17所示，第四部432沿容纳部1的整个周向延伸。
其中，第三部431和第四部432可通过焊接的方式连接于第三部431靠近容纳部1的边缘，第四部432的其余长度段通过注塑的方式与绝缘基体41连接。第四部432的外侧壁可不超出绝缘基体41的外侧壁。如图15至图17所示，第四部432与端盖本体21上的弯折部212电连接。可选地，第四部432与容纳部1的侧壁11连接。
该实施例使第四部432沿容纳部1的整个周向延伸，能够增加第四部432与端盖本体21直接或间接电连接的长度，可提高连接可靠性，并增加过流能力。
在一些实施例中，第四部432与第三部431成角度设置。
其中，第四部432相对于第三部431朝向端盖本体21或者电极组件3弯折，第四部432与容纳部1的侧壁11或端盖本体21电连接，例如可通过焊接等方式实现电连接。其中，第四部432相对于第三部431之间的夹角可以为锐角、直角或钝角。
该实施例使第四部432与第三部431成角度设置，可增加第四部432与容纳部1的侧壁11或端盖本体21电连接的面积，便于通过焊接实现电连接，还可提高电连接可靠性。
在一些实施例中，第四部432朝向靠近端盖组件2的方向延伸。
该实施例使第四部432朝向远离电极组件3的方向延伸，可防止第四部432在振动或冲击情况下插入电极组件3的极片之间造成活性物质脱落，还可防止第四部432与极性相反的极片接触而发生短路，提高绝缘可靠性；而且，第四部432更靠近容纳部1的开口111，更方便从开口111处将第四部432焊接于容纳部1的侧壁，可提高焊接质量。
在一些实施例中，如图7所示，端盖组件2还包括第一绝缘件23，第一绝缘件23设在端盖本体21与集流组件4之间，第一绝缘件23与容纳部1的侧壁11之间至少在对应于第四部432的区域具有第一间隙L1，第四部432位于第一间隙L1内。
其中，第一绝缘件23可以只在第四部432对应的区域与容纳部1之间具有第一间隙L1，以供第四部432伸入，或者为了加工装配方便，第一绝缘件23在整个周向上与容纳部1之间均具有一致的第一间隙L1。第四部432与端盖本体21之间具有预设间隔，以使端盖组件2能够在容纳部1的开口111处安装到位。
该实施例使第四部432位于第一绝缘件23与容纳部1之间的第一间隙L1内，可 与第一绝缘件23共用空间，第四部432的内侧通过第一绝缘件23进行绝缘；而且，可防止第四部432在振动或冲击情况下插入电极组件3的极片之间造成活性物质脱落，还可防止第四部432与极性相反的极片接触而发生短路，提高绝缘可靠性；此外，第四部432更靠近容纳部1的开口111，更方便从开口111处将第四部432焊接于容纳部1的侧壁11，在采用焊接时，可从容纳部1内侧焊接第四部432与侧壁11，可提高焊接质量，或者便于直接将第四部432与端盖本体21电连接。
在一些实施例中，如图6所示，壳体10呈圆柱形，第一绝缘件23呈圆环状，第一绝缘件23的外径为d，端盖本体21的外径为D，第四部432的厚度为δ，d≤D-2*δ。
该实施例将第一绝缘件23的外壁设置为圆周面，方便加工，而且在装配第一绝缘件23所在的端盖组件2时，无需使第一绝缘件23与第四部432进行周向对准，方便装配，可提高装配效率。
在一些实施例中，如图7所示，容纳部1具有侧壁11，第二集流件43通过侧壁11与端盖本体21电连接。
其中，容纳部1具有侧壁11和端壁12，侧壁11的一端形成开口111并通过端盖组件2封闭，侧壁11的另一端通过端壁12封闭。第二集流件43通过侧壁11与端盖本体21电连接，即第二集流件43与侧壁11电连接，侧壁11与端盖本体21电连接。具体地，第二集流件43的第四部432与侧壁11电连接，例如采用焊接的方式电连接，焊接操作可从容纳部1内侧或外侧进行。侧壁11与端盖本体21之间在开口111处可通过焊接实现电连接。
该实施例中第二集流件43通过侧壁11与端盖本体21电连接，可降低对第二集流件43外端连接部分长度的要求，还可降低对端盖本体21结构的要求，端盖本体21可设计为平板结构，无需考虑与第二集流件43的连接问题，可简化端盖本体21的结构，降低制造难度。
而且，可实现从容纳部1内侧焊接第二集流件43和侧壁11，一方面，此种方式容易观察到焊接的情况，可提高焊接可靠性，若出现第四部432与容纳部1的侧壁虚接触的情况下可及时调整，也不会受到容纳部1外表面的镀层对焊接的影响，可保证焊接质量；而且，此种焊接方式不会破坏容纳部1外的镀层，可保证电池单体100的抗腐蚀性能。另一方面，在第二集流件43为负极集流件时，负极集流件采用铜材料，容纳部1采用钢材料，即使不同种材料由于热膨胀系数和导热率的差别，在激光焊接时在焊缝区域和热影响区出现微裂纹，微裂纹也位于容纳部1的内壁面，电池单体100也长期时候后也不会造成电解液渗透，而且容纳部1在裂纹处也不会发生腐蚀。
在一些实施例中，如图18和图19，端盖本体21具有弯折部212，弯折部212朝向端盖本体21内侧凸出，且靠近容纳部1设置，第二集流件43与弯折部212电连接。
其中，弯折部212可设在端盖本体21位于第一电极引出部22以外的区域，且靠近端盖本体21的边缘设置。端盖本体21可采用板状结构通过冲压的方式形状弯折部212，弯折部212的横截面可呈U形，弯折部212的延伸长度可与第四部432的延伸长度一致。第二集流件43的第四部432可与弯折部212的侧面或底面进行焊接。第二集流件43与侧壁11可接触，也可保持间隙。
第四部432可沿容纳部1的整个周向延伸，相应地，弯折部212也沿端盖本体21的整个周向延伸，既能第四部432与弯折部212的电连接长度，提高电连接可靠性，并增加过流能力。而且，可增加端盖本体21的强度，使端盖本体21在整个周向上强度均匀。
该实施例将第二集流件43通过弯折部212与端盖本体21电连接，可增加第二集流件43与端盖本体21的接触面积，例如在采用焊接实现电连接时，既能提高连接可靠性，又能增加接触面积。而且，此种结构也适用于容纳部1与端盖本体21之间绝缘的情况，或者在端盖本体21与容纳部1之间出现焊缝脱落的情况下，第二集流件43也能可靠地将电能输出至端盖本体21。此外还可解决容纳部1和端盖本体21较薄影响过流能力的问题。
在一些实施例中，如图18和图19，弯折部212与容纳部1之间具有第二间隙L2，第二集流件43的外端位于第二间隙L2内。
其中，以圆柱形电池单体100为例，端盖组件2包括端盖本体21和第一绝缘件23，第一绝缘件23设在端盖本体21与集流组件4之间。弯折部212的径向内侧壁与第一绝缘件23的外壁贴合，第二集流件43的第四部432与弯折部212的径向外侧壁贴合，第四部432位于第二间隙L2内，第二间隙L2小于第一间隙L1。第四部432与侧壁11可接触，也可保持间隙。弯折部212的底部与第二集流件43的第三部431之间可保持第三间隙H，以免弯折部212与第三部431之间发生干涉。
该实施例将第二集流件43与弯折部212朝向容纳部1的侧壁接触，方便通过焊接实现电连接，而且也利于增大第二集流件43与弯折部212之间电连接的面积，提高电连接可靠性，并保持第二集流件43位置稳定。
在一些实施例中，第一极耳32和第二极耳33沿电极组件3的周向间隔设置。
其中，第一极耳32和第二极耳33沿电极组件3的周向间隔设置，使第一极耳32和第二极耳33均沿电极组件3的部分周向延伸。可选地，第一极耳32和第二极耳33可相对设置，例如，第一极耳32和第二极耳33相对于卷绕轴线K呈中心对称，以增加第一极耳32和第二极耳33之间的距离，有利于保证绝缘效果。可选地，第一极耳32和第 二极耳33可呈扇形或矩形等，两者的形状可相同，亦可不同。
该实施例中第一极耳32和第二极耳33的设置方式，既能从空间上更好地将不同极性的极耳隔开，又能使电解液通过间隔区域浸润到电极主体31内部，以在电池单体100充放电的过程中，使电解液与极片上的活性物质充分发生反应。
在一些实施例中，如图10所示，第一集流件42与第一极耳32连接部分的形状与第一极耳32的端面形状相同；和/或第二集流件43与第二极耳33连接部分形状与第二极耳33的端面形状相同。
其中，第一集流件42与第一极耳32连接部分为第一部421，第一部421设在第一开口413内，第二集流件43与第二极耳33连接部分为第一部421，第三部431设在第二开口414内。由此，第一部421、第一开口413和第一极耳32端面的形状相同，第三部431、第二开口414和第二极耳33端面的形状形同。
对于圆柱形电池单体100，第一极耳32和第二极耳33可设计为扇形或矩形，可根据第一极耳32和第二极耳33的形状设计第一开口413和第二开口414的形状。
该实施例有利于使第一极耳32和/或第二极耳33的整个端面都能与对应的集流件电连接，能够保证电流传输能力；在此基础上，还能减少集流件的多余面积，节省材料。
在一些实施例中，如图10所示，第一集流件42与第一极耳32连接的部分覆盖第一极耳32；和/或第二集流件43与第二极耳33连接的部分覆盖第二极耳33。
其中，第一集流件42与第一极耳32连接部分为第一部421，第一部421设在第一开口413内，第二集流件43与第二极耳33连接部分为第一部421，第三部431设在第二开口414内。第一部421覆盖第一极耳32，可使第一极耳32整体都能与第一部421可靠电连接，以保证电流传输能力。第三部431覆盖第二极耳33，可使第二极耳33整体都能与第三部431可靠电连接，以保证电流传输能力。
该实施例能够使第一极耳32和/或第二极耳33的整个端面都能与对应的集流件电连接，能够保证电流传输能力。
在一些实施例中，电极组件3呈卷绕结构，第一极耳32和第二极耳33中的至少一个沿卷绕结构的径向从中心向外侧宽度逐渐增大。
例如，第一极耳32和第二极耳33中的至少一个可呈扇形。
该实施例可使第一极耳32中每组相邻层第一极耳部间距均匀分布，或使第二极耳33中每组相邻层第二极耳部间距均匀分布；而且，通过增加外层区域极耳沿卷绕方向的宽度，能够增加极耳与集流件连接时的有效接触面积，可增加过流能力，从而提高电池单体100的性能。
可选地，电极组件3呈卷绕结构，第一极耳32和第二极耳33中的至少一个沿卷绕结构的径向从中心向外侧宽度一致。例如，第一极耳32和第二极耳33中的至少一个呈矩形。此种结构能够降低模切极耳的难度，易于保证极耳部的尺寸，在卷绕时易于保证多层极耳部的对齐程度，从而降低制备电极组件3的工艺难度。
在一些实施例中，绝缘基体41朝向电极主体31的表面具有第三绝缘部，第三绝缘部位于第一极耳32与第二极耳33之间。
其中，第三绝缘部可在电极组件3的周向上位于第一极耳32和第二极耳33之间，或者在不遮挡电极主体31的中心孔311的前提下，第三绝缘部也可在电极组件3的径向上位于第一极耳32和第二极耳33之间，既能提高绝缘效果，又能在电池单体100发生热失控的情况下，使内部的气体和高温物质可顺利地沿着中心孔311到达壳体10上的泄压部件。
该实施例能够在第一极耳32和第二极耳33从空间上保持距离的基础上，进一步通过绝缘材质的第三绝缘部将第一极耳32和第二极耳33隔开，能够提高绝缘可靠性，从而提高电池单体100工作的可靠性和安全性；而且，第三绝缘部作为绝缘基体41的一部分，无需设置单独的结构，也无需额外进行固定。
下面以圆柱形电池单体100为例，通过两个具体实施例来说明本申请电池单体100的结构。
图3至图14为本申请第一实施例。
如图3和图4所示，电池单体100包括：壳体10、电极组件3和集流组件4。其中，壳体10包括容纳部1和端盖组件2，端盖组件2用于封闭容纳部1的开口111。端盖组件2包括：端盖组件2可包括端盖本体21和第一电极引出部22，端盖本体21上设有第二通孔211，第一电极引出部22设在第二通孔211内，第一电极引出部22可以为电极端子。容纳部1作为第二电极引出部。
如图5所示，电极组件3设在容纳部1内，电极组件3为卷绕结构，包括电极主体31、第一极耳32和第二极耳33，电极主体31呈圆柱形，第一极耳32和第二极耳33从电极主体31靠近端盖组件2的同端引出，第一极耳32和第二极耳33可相对于卷绕轴线K相对设置，其端面可呈扇形或矩形结构，例如，第一极耳32和第二极耳33相对于卷绕轴线K呈中心对称。集流组件4在卷绕轴线K所在方向上位于端盖组件2与电极组件3之间。
如图6所示，端盖组件2还包括第一绝缘件23、密封件24、第二绝缘件25和密封盖26，第一绝缘件23位于端盖本体21和集流组件4之间，端盖本体21呈圆盘状结构， 第一绝缘件23为环状结构，第一绝缘件23的直径小于端盖本体21的直径。
第一电极引出部22包括第一段221、第二段222和第三段223，第二段222和第三段223分别连接于第一段221的两端，第一段221设在第二通孔211内，第二段222位于端盖本体21的外侧，第二段222与端盖本体21之间可设置第二绝缘件25，第三段223位于端盖本体21的内侧，第三段223与端盖本体21之间可设置密封件24，密封件24位于环形的第一绝缘件23内。第一绝缘件23靠近集流组件4的表面上设有第四凹槽231，第三段223位于第四凹槽231内，以使第一绝缘件23和第一电极引出部22朝向电极组件3的表面齐平。
第一电极引出部22的内表面设有第一凹槽224，第一电极引出部22的外表面设有第二凹槽225，第二凹槽225的底面设有第三凹槽226，由此，可减小第一电极引出部22的焊接厚度，可提高第一电极引出部22与第一集流件42之间电连接的可靠性。第三凹槽226的底面设有注液孔227，用于注入电解液。
如图7所示，第二集流件43包括相互连接的第三部431和第四部432，第三部431与第二极耳33焊接，第四部432相对于第三部431朝向端盖本体21弯折，且位于第一绝缘件23与容纳部1之间的间隙内，第四部432与容纳部1的侧壁通过焊接实现电连接。第三部431上覆盖绝缘片6，以实现第三部431与第一电极引出部22之间的绝缘。
如图8所示，第一集流件42包括相互连接的第一部421和第二部422，第二部422相对于第一部421朝向第一电极引出部22凸出，且凸出部分位于第一凹槽224内。第一部421的表面通过间隔片5覆盖，间隔片5和绝缘片6朝向第一电极引出部22的表面平齐，以便为第一电极引出部22和第一绝缘件23提供稳定的支撑。
如图9所示，集流组件4包括绝缘基体41、第一集流件42和第二集流件43，这三个零件可通过注塑一体成型。第一集流件42和第二集流件43通过绝缘基体41彼此绝缘。
如图10所示，绝缘基体41包括第一绝缘部411和设在第一绝缘部411中心区域的第二绝缘部412，第一绝缘部411为圆板状结构，第一开口413和第二开口414设置于第一绝缘部411，第一开口413和第二开口414相对设置，且均采用具有内圆弧的扇形结构；第二绝缘部412相对于第一绝缘部411朝向端盖组件2凸出。第一绝缘部411的直径大于第一开口413的外圆弧壁的直径，第二开口414贯通第一绝缘部411的外边缘。
第一集流件42包括：第一部421和第二部422，第一部421与第一开口413配合，且与第一极耳32电连接；第二部422连接于第一部421且搭接于第二绝缘部412，第二部422相对于第一部421朝向第一电极引出部22的方向凸出，第二部422与第一电极引 出部22电连接。第二集流件43包括：第三部431和第四部432，第三部431与第二开口414配合，且与第二极耳33电连接，第四部432与第三部431成角度设置，第四部432与容纳部1的侧壁11电连接，由此，第二集流件42通过侧壁11实现与端盖本体21电连接。
如图11A和图11B所示，第一部421远离第二部422的两个角部均设有第一缺口425，被配置为与注塑模具中的第一定位部配合实现第一集流件42的定位。第三部431远离第四部432的两个角部分别设有第二缺口433，被配置为与注塑模具中的第二定位部配合实现第二集流件43的定位。
如图12A和图12B所示，第一部421可呈扇形结构，其外圆弧壁和两个侧壁的至少一个上可设置凸起423，凸起423的厚度可与第一部421一致，或者考虑到绝缘基体41的厚度较薄，为了在设置第二凹槽415后仍保证绝缘基体41的强度，也可使凸起423的厚度小于第一部421的厚度。设在第一部421的侧壁上的凸起423可以为矩形，凸起423的长度可小于侧壁的长度；设在第一部421的外圆弧壁上的凸起423可以为圆弧形，凸起423的长度可小于外圆弧壁的长度。第二凹槽415的形状和尺寸与凸起423适配。
如图13A和图13B，第二集流件43与第二开口414配合的部分为第三部431，第三部431可呈扇形结构，其两个侧壁的至少一个上可设置凸起423，凸起423的厚度可与第三部431一致，或者考虑到绝缘基体41的厚度较薄，为了在设置第二凹槽415后仍保证绝缘基体41的强度，也可使凸起423的厚度小于第三部431的厚度。
如图14所示，凸起423上设有第一通孔424，绝缘基体41上设有限位柱416，限位柱416嵌入第一通孔424。第二凹槽415和限位柱416都是在注塑过程中自然形成的。
图15至图20为本申请第二实施例，与第一实施例的不同之处在于：
第二集流件43包括：第三部431和第四部432，第三部431与第二开口414配合，且与第二极耳33电连接，第四部432与第三部431成角度设置，且第四部432沿容纳部1的整个周向延伸，第三部431和第四部432可通过焊接的方式连接于第三部431靠近容纳部1的边缘，第四部432的其余长度段通过注塑的方式与绝缘基体41连接。第四部432朝上弯折，并与端盖本体21上弯折部212的径向外侧壁电连接，第四部432位于弯折部212与容纳部1之间形成的第二间隙L2内。第二集流件43直接与端盖本体21电连接。
第二绝缘部412与第一绝缘部411朝向端盖组件2的表面平齐，第一集流件42包括相互连接的第一部421和第二部422，第二部422搭接于第二绝缘部412，第一部421和第二部422之间具有高度差，且两者通过连接部426连接。
此种电池单体100的装配方式为：在将集流组件4放置于电极组件3的端部，并将第一集流件42和第一极耳32焊接，且第二集流件43和第二极耳33焊接之后，安装端盖组件2，再将第一电极引出部22与第一集流件42从外部焊接，并将第一集流件42的第四部432与弯折部212焊接。最后将电极组件3与端盖组件2形成的整体装入容纳部1内，再将端盖本体21与容纳部1在开口111处焊接封闭。
如图21所示，对于第一电极引出部22设在端盖本体21，且端盖本体21作为第二电极引出部的实施例，多个电池单体100可通过如下方式实现电连接。
在一些实施例中，电池单体100设有至少两个，电池200还包括汇流件202，汇流件202的第一端连接于其中一个电池单体100的第一电极引出部22，汇流件202的第二端连接于另一个电池单体100的第二电极引出部。其中，汇流件202可以时金属片状或板状结构。该实施例可方便地实现多个电池单体100的电连接。
在一些实施例中，壳体10包括：容纳部1，具有开口111；和端盖组件2，封闭开口111，端盖组件2包括端盖本体21和绝缘设置于端盖本体21的第一电极引出部22；其中，汇流件202的第二端连接于端盖本体21。
其中，第一电极引出部22可设在端盖本体21的中心位置，此种结构有利于增加汇流件202的宽度尺寸，并增大第一电极引出部22的横截面积，以提高过流能力。具体地，汇流件202可包括条形部和两个分叉部，两个分叉部均连接于条形部的第一端，且分别位于第一电极引出部22的两侧，两个分叉部贴设在其中一个电池单体100的端盖本体21的外表面，条形部的第二端连接于另一个电池单体100的第一电极引出部22的顶面。由于第一电极引出部22的顶面高于端盖本体21的表面，条形部上可设有折弯结构，以适应第一电极引出部22和端盖本体21的高度差。
可选地，电池200中设有至少一排电池单体100，每排电池单体100中的汇流件202依次顺序连接。
该实施例可方便地实现多个电池单体100的电连接，允许多个电池单体100的布局更紧凑，且利于增大汇流件202的宽度，提高过流能力。
其次，本申请还提供了一种电池单体100的制造方法，包括以下步骤：
S110、提供壳体：提供壳体10，壳体10设有极性相反的第一电极引出部22和第二电极引出部；
S120、装配电极：提供电极组件3并放置于壳体10内，电极组件3包括电极主体31、第一极耳32和第二极耳33，第一极耳32和第二极耳33从电极主体31的同侧引出；
S130、电连接：将集流组件4设于电极主体31靠近第一极耳32和第二极耳33的 一侧，集流组件4包括第一集流件42和第二集流件43，并通过第一集流件42将第一极耳32和第一电极引出部22电连接，通过第二集流件43将第二极耳33和第二电极引出部电连接。
其中，S110至S130顺序执行。
该实施例将第一极耳32和第二极耳33从电极主体31的同一端引出，只需要在电极组件3的一端预留电连接空间，无需在电池单体100的两端分别设置电极引出部，可有效提高电池单体100的整体能量密度，在电池单体100的容量一定的情况下，能够减小电池单体100的体积，使电池200更容易安装于高度空间有限的用电装置中；或者在电池单体100的体积一定的情况下，能够提高容量，延长电池200的续航能力。
在一些实施例中，本申请的制造方法还包括：将第一集流件42和第二集流件43连接于所述绝缘基体41，且通过所述绝缘基体41彼此绝缘。
该实施例的制造方法简化了电池单体100内部的电连接结构，可进一步节约电池单体100的内部空间，降低重量，且节省零部件的生产成本；第一集流件42和第二集流件43通过绝缘基体41承载，可提高整体刚性，不容易发生变形，安装稳定，从而，提高电连接可靠性。而且，此种设计还可降低装配难度，无需将第一集流件42、第二集流件43和绝缘基体41分别安装，对横截面尺寸较小的电池单体100有更加明显的优势，可提高装配效率。另外，第一集流件42和第二集流件43通过与之集成为一体的绝缘基体41实现彼此绝缘，可提高绝缘可靠性，减少由于装配误差或振动影响绝缘性能，从而提高电池单体100工作的可靠性和安全性。
在一些实施例中，壳体10包括容纳部1和端盖组件2，容纳部1具有开口111，端盖组件2封闭开口111，端盖组件2包括端盖本体21，第一电极引出部22设置于端盖本体21，端盖本体21作为第二电极引出部；S130电连接步骤包括：
S131、将第一极耳32和第二极耳33分别与第一集流件42和第二集流件43焊接；
S132、将第二集流件43与端盖本体21电连接；
S133、将端盖组件2封闭开口111；
S134、将第一集流件42与第一电极引出部22从外部焊接。
其中，在S131中，将第一极耳32与第一集流件42的第一部421焊接，第二极耳33与第二集流件43的第三部431焊接，例如可采用激光焊接的方式。
在S131之后，S132和S133的执行顺序可根据具体结构的需要选择。S132中，第二集流件43可直接与端盖本体21电连接，或者第二集流件43通过容纳部1的侧壁11与端盖本体21电连接。在S134中，从端盖组件2的外侧将第一集流件42的第二部422 与第一电极引出部22焊接。在焊接完毕后，可将密封盖26安装于第一电极引出部22，以将注液孔227封闭。
该实施例能够顺利地实现第一集流件42与第一电极引出部22的电连接，以及第二集流件43与容纳部1的电连接。
在一些实施例中，如图3至图14所示，容纳部1具有侧壁11，容纳部1与端盖本体21电连接，将第二集流件43与端盖本体21电连接的步骤S132包括：
使第二集流件43与侧壁11电连接，且侧壁11与端盖本体21电连接。
其中，第二集流件43通过侧壁11与端盖本体21电连接，即第二集流件43与侧壁11电连接，侧壁11与端盖本体21电连接。具体地，第二集流件43的第四部432与侧壁11电连接，例如采用焊接的方式电连接，焊接操作可从容纳部1内侧或外侧进行。侧壁11与端盖本体21之间在开口111处可通过焊接实现电连接。
该实施例中第二集流件43通过侧壁11与端盖本体21电连接，可降低对第二集流件43外端连接部分长度的要求，还可降低对端盖本体21结构的要求，端盖本体21可设计为平板结构，无需考虑与第二集流件43的连接问题，可简化端盖本体21的结构，降低制造难度。
在一些实施例中，第二集流件43与侧壁11从容纳部1的内侧焊接。
可选地，S132在S133之前执行，S132中，可从容纳部1的内侧将第二集流件43的第四部432与容纳部1的侧壁焊接，此种方式容易观察到焊接的情况，可提高焊接可靠性，若出现第四部432与容纳部1的侧壁虚接触的情况下可及时调整，也不会受到容纳部1外表面的镀层对焊接的影响，可保证焊接质量；而且，此种焊接方式不会破坏容纳部1外的镀层，可保证电池单体100的抗腐蚀性能。在S132之后，将端盖组件2安装于容纳部1的开口。可选地，S133在S132之前执行，先将端盖组件2安装于容纳部1的开口111，再从容纳部1的外侧将第四部432与容纳部1的侧壁焊接。
而且，此种方式可实现从容纳部1内侧焊接第二集流件43和侧壁11，在第二集流件43为负极集流件时，负极集流件采用铜材料，容纳部1采用钢材料，即使不同种材料由于热膨胀系数和导热率的差别，在激光焊接时在焊缝区域和热影响区出现微裂纹，微裂纹也位于容纳部1的内壁面，电池单体100也长期时候后也不会造成电解液渗透，而且容纳部1在裂纹处也不会发生腐蚀。
在一些实施例中，第二集流件43包括：第三部431，用于与第二极耳33电连接；和第四部432，连接于第三部431靠近容纳部1的边缘，第四部432与第三部431成角度设置，第四部432与侧壁11电连接；制造方法还包括：
在将集流组件4放入容纳部1前，第四部432与第三部431之间的夹角呈钝角。
例如，该夹角可处于如下区间内(90°，120°]。
该实施例在将集流组件4放入容纳部1前，将第四部432弯折调整至与第三部431之间呈钝角，即第四部432的自由端相对于与第三部431连接的端部外扩，这样在集流组件4装入容纳部1后，第四部432在容纳部1侧壁的作用下向内收回，并保证与容纳部1的侧壁过盈配合，能够保证焊接效果，提高电连接的可靠性。
虽然已经参考优选实施例对本申请进行了描述，但在不脱离本申请的范围的情况下，可以对其进行各种改进并且可以用等效物替换其中的部件。尤其是，只要不存在结构冲突，各个实施例中所提到的各项技术特征均可以任意方式组合起来。本申请并不局限于文中公开的特定实施例，而是包括落入权利要求的范围内的所有技术方案。

Claims (44)

  1. 一种电池单体(100)，包括：
    壳体(10)，设有极性相反的第一电极引出部(22)和第二电极引出部；
    电极组件(3)，设在所述壳体(10)内，所述电极组件(3)包括电极主体(31)以及从所述电极主体(31)同侧引出的第一极耳(32)和第二极耳(33)；
    集流组件(4)，设于所述电极主体(31)靠近所述第一极耳(32)和所述第二极耳(33)的一侧，所述集流组件(4)包括第一集流件(42)和第二集流件(43)，所述第一集流件(42)将所述第一极耳(32)和所述第一电极引出部(22)电连接，所述第二集流件(43)将所述第二极耳(33)和所述第二电极引出部电连接。
  2. 根据权利要求1所述的电池单体(100)，其中，所述第一集流件(42)的至少部分抵接于所述第一极耳(32)背离所述述电极主体(31)的表面，所述第二集流件(43)的至少部分抵接于所述第二极耳(33)背离所述述电极主体(31)的表面。
  3. 根据权利要求1或2所述的电池单体(100)，其中，所述壳体(10)包括：
    容纳部(1)，具有开口(111)；和
    端盖组件(2)，封闭所述开口(111)，所述端盖组件(2)包括端盖本体(21)和绝缘设置于所述端盖本体(21)的第一电极引出部(22)，且所述端盖本体(21)作为所述第二电极引出部；
    其中，所述第二集流件(43)与所述端盖本体(21)电连接。
  4. 根据权利要求3所述的电池单体(100)，其中，所述集流组件(4)还包括绝缘基体(41)，所述第一集流件(42)和所述第二集流件(43)连接于所述绝缘基体(41)，且通过所述绝缘基体(41)彼此绝缘。
  5. 根据权利要求4所述的电池单体(100)，其中，所述第一集流件(42)、所述第二集流件(43)和所述绝缘基体(41)一体注塑成型。
  6. 根据权利要求4或5所述的电池单体(100)，其中，所述绝缘基体(41)包括第一绝缘部(411)，所述第一绝缘部(411)具有第一开口(413)和第二开口(414)，所述第一集流件(42)的至少部分容纳于所述第一开口(413)，所述第二集流件(43)的至少部分容纳于所述第二开口(414)；
    所述第一绝缘部(411)的部分位于所述第一开口(413)与所述第二开口(414)之间，并用于隔开所述第一集流件(42)和所述第二集流件(43)。
  7. 根据权利要求6所述的电池单体(100)，其中，所述第一开口(413)内侧壁上设 有第二凹槽(415)，所述第一集流件(42)与所述第一开口(413)配合的外侧壁上设有凸起(423)，所述凸起(423)嵌入所述第二凹槽(415)内，以使所述第一集流件(42)与所述绝缘基体(41)结合；和/或
    所述第二开口(414)内侧壁上设有第二凹槽(415)，所述第二集流件(43)与所述第二开口(414)配合的外侧壁上设有凸起(423)，所述凸起(423)嵌入所述第二凹槽(415)内，以使所述第二集流件(43)与所述绝缘基体(41)结合。
  8. 根据权利要求7所述的电池单体(100)，其中，所述凸起(423)上设有第一通孔(424)，所述绝缘基体(41)上设有限位柱(416)，所述限位柱(416)嵌入所述第一通孔(424)。
  9. 根据权利要求6～8任一项所述的电池单体(100)，还包括：绝缘片(6)，设在所述第二集流件(43)与所述第一电极引出部(22)之间。
  10. 根据权利要求9所述的电池单体(100)，还包括：间隔片(5)，设在所述第一集流件(42)与所述第一电极引出部(22)之间，所述间隔片(5)与所述绝缘片(6)各自朝向所述端盖组件(2)的表面平齐，且不低于所述第一绝缘部(411)的表面。
  11. 根据权利要求4～8任一项所述的电池单体(100)，其中，所述第一集流件(42)靠近所述容纳部(1)的边缘被所述绝缘基体(41)包围。
  12. 根据权利要求3～11任一项所述的电池单体(100)，其中，所述端盖组件(2)还包括第一绝缘件(23)，所述第一绝缘件(23)设在所述端盖本体(21)与所述集流组件(4)之间，所述第一绝缘件(23)最靠近所述电极组件(3)的端面和所述第一电极引出部(22)最靠近所述电极组件(3)的端面齐平。
  13. 根据权利要求4～11所述的电池单体(100)，其中，所述绝缘基体(41)包括第一绝缘部(411)和连接于所述第一绝缘部(411)的第二绝缘部(412)，所述第一绝缘部(411)具有第一开口(413)，所述第一集流件(42)包括：
    第一部(421)，与所述第一开口(413)配合，且与所述第一极耳(32)电连接；和
    第二部(422)，连接于所述第一部(421)且搭接于所述第二绝缘部(412)，所述第二部(422)与所述第一电极引出部(22)电连接。
  14. 根据权利要求13所述的电池单体(100)，其中，所述第一电极引出部(22)设在所述端盖本体(21)的中心区域，所述第二绝缘部(412)设在所述第一绝缘部(411)的中心区域。
  15. 根据权利要求14所述的电池单体(100)，其中，所述第一电极引出部(22)与 所述第二集流件(43)在所述容纳部(1)的横截面内的投影具有重叠区域，所述第二绝缘部(412)相对于所述第一绝缘部(411)朝向所述第一电极引出部(22)凸出，所述第二部(422)相对于所述第一部(421)朝向所述第一电极引出部(22)凸出。
  16. 根据权利要求15所述的电池单体(100)，其中，所述第一电极引出部(22)的内端面设有第一凹槽(224)，所述第二部(422)的至少部分位于所述第一凹槽(224)内。
  17. 根据权利要求15所述的电池单体(100)，其中，所述端盖组件(2)还包括第一绝缘件(23)，所述第一绝缘件(23)设在所述端盖本体(21)与所述集流组件(4)之间，所述第一绝缘件(23)覆盖所述第一电极引出部(22)内端面的径向外侧区域，且与所述第一电极引出部(22)的内端面形成第一凹槽(224)，所述第二部(422)的至少部分位于所述第一凹槽(224)内。
  18. 根据权利要求16或17所述的电池单体(100)，其中，所述第一凹槽(224)的深度不超过所述第二部(422)相对于所述第一部(421)的凸起高度。
  19. 根据权利要求13～18任一项所述的电池单体(100)，其中，所述第二绝缘部(412)位于所述第一开口(413)以外的侧壁超出所述第二部(422)的外侧壁。
  20. 根据权利要求13～19任一项所述的电池单体(100)，其中，所述第一部(421)远离所述第二部(422)的至少一个角部设有第一缺口(425)，被配置为与注塑模具中的第一定位部配合实现所述第一集流件(42)的定位。
  21. 根据权利要求4～11和13～20任一项所述的电池单体(100)，其中，所述绝缘基体(41)包括第一绝缘部(411)，所述第一绝缘部(411)具有第二开口(414)，所述第二集流件(43)包括：
    第三部(431)，与所述第二开口(414)配合，且与所述第二极耳(33)电连接；和
    第四部(432)，至少部分连接于所述第三部(431)靠近所述容纳部(1)的边缘，且所述第四部(432)与所述端盖本体(21)电连接。
  22. 根据权利要求21所述的电池单体(100)，其中，所述第三部(431)远离所述第四部(432)的至少一个角部设有第二缺口(433)，被配置为与注塑模具中的第二定位部配合实现所述第二集流件(43)的定位。
  23. 根据权利要求21或22所述的电池单体(100)，其中，所述第四部(432)在所述容纳部(1)周向上的延伸长度不超出所述第三部(431)靠近所述容纳部(1)的边缘。
  24. 根据权利要求21或22所述的电池单体(100)，其中，所述第四部(432)沿所 述容纳部(1)的整个周向延伸。
  25. 根据权利要求21～24任一项所述的电池单体(100)，其中，所述第四部(432)与所述第三部(431)成角度设置。
  26. 根据权利要求21～25任一项所述的电池单体(100)，其中，所述第四部(432)朝向靠近所述端盖组件(2)的方向延伸。
  27. 根据权利要求26所述的电池单体(100)，其中，所述容纳部(1)具有侧壁(11)，所述端盖组件(2)还包括第一绝缘件(23)，所述第一绝缘件(23)设在所述端盖本体(21)与所述集流组件(4)之间，所述第一绝缘件(23)与所述侧壁(11)之间至少在对应于所述第四部(432)的区域具有第一间隙(L1)，所述第四部(432)位于所述第一间隙(L1)内。
  28. 根据权利要求27所述的电池单体(100)，其中，所述壳体(10)呈圆柱形，所述第一绝缘件(23)呈圆环状，所述第一绝缘件(23)的外径为d，所述端盖本体(21)的外径为D，所述第四部(432)的厚度为δ，d≤D-2*δ。
  29. 根据权利要求3～28任一项所述的电池单体(100)，其中，所述容纳部(1)具有侧壁(11)，所述第二集流件(43)通过所述侧壁(11)与所述端盖本体(21)电连接。
  30. 根据权利要求3～28任一项所述的电池单体(100)，其中，所述端盖本体(21)具有弯折部(212)，所述弯折部(211)朝向所述端盖本体(21)内侧凸出，且靠近所述容纳部(1)设置，所述第二集流件(43)与所述弯折部(211)电连接。
  31. 根据权利要求30所述的电池单体(100)，其中，所述弯折部(211)与所述容纳部(1)之间具有第二间隙(L2)，所述第二集流件(43)的外端位于所述第二间隙(L2)内。
  32. 根据权利要求1～31任一项所述的电池单体(100)，其中，所述第一极耳(32)和所述第二极耳(33)沿所述电极组件(3)的周向间隔设置。
  33. 根据权利要求1～32任一项所述的电池单体(100)，其中，
    所述第一集流件(42)与所述第一极耳(32)连接部分的形状与所述第一极耳(32)的端面形状相同；和/或
    所述第二集流件(43)与所述第二极耳(33)连接部分的形状与所述第二极耳(33)的端面形状相同。
  34. 根据权利要求1～33任一项所述的电池单体(100)，其中，所述第一集流件(42)与所述第一极耳(32)连接的部分覆盖所述第一极耳(32)；和/或所述第二集流件(43) 与所述第二极耳(33)连接的部分覆盖所述第二极耳(33)。
  35. 根据权利要求1～34任一项所述的电池单体(100)，其中，所述电极组件(3)呈卷绕结构，所述第一极耳(32)和所述第二极耳(33)中的至少一个沿所述卷绕结构的径向从中心向外侧宽度逐渐增大。
  36. 一种电池(200)，包括权利要求1～35任一项所述的电池单体(100)。
  37. 根据权利要求36所述的电池(200)，其中，所述电池单体(100)设有至少两个，所述电池(200)还包括汇流件(202)，所述汇流件(202)的第一端连接于其中一个所述电池单体(100)的所述第一电极引出部(22)，所述汇流件(202)的第二端连接于另一个所述电池单体(100)的所述第二电极引出部。
  38. 根据权利要求37所述的电池(200)，其中，所述壳体(10)包括：
    容纳部(1)，具有开口(111)；和
    端盖组件(2)，封闭所述开口(111)，所述端盖组件(2)包括端盖本体(21)和绝缘设置于所述端盖本体(21)的第一电极引出部(22)；
    其中，所述汇流件(202)的第二端连接于所述端盖本体(21)。
  39. 一种用电装置，包括权利要求1～35任一项所述的电池单体(100)和/或权利要求36～38任一项所述的电池(200)，用于为所述用电装置提供电能。
  40. 一种电池单体(100)的制造方法，包括以下步骤：
    提供壳体：提供壳体(10)，所述壳体(10)设有极性相反的第一电极引出部(22)和第二电极引出部；
    装配电极：提供电极组件(3)并放置于所述壳体(10)内，所述电极组件(3)包括电极主体(31)、第一极耳(32)和第二极耳(33)，所述第一极耳(32)和所述第二极耳(33)从所述电极主体(31)的同侧引出；和
    电连接：将所述集流组件(4)设于所述电极主体(31)靠近所述第一极耳(32)和所述第二极耳(33)的一侧，所述集流组件(4)包括第一集流件(42)和第二集流件(43)，并通过所述第一集流件(42)将所述第一极耳(32)和所述第一电极引出部(22)电连接，通过所述第二集流件(43)将所述第二极耳(33)和所述第二电极引出部电连接。
  41. 根据权利要求40所述的制造方法，其中，所述壳体(10)包括容纳部(1)和端盖组件(2)，所述容纳部(1)具有开口(111)，所述端盖组件(2)封闭所述开口(111)，所述端盖组件(2)包括端盖本体(21)和绝缘设置于所述端盖本体(21)的所述第一电极引出部(22)，所述端盖本体(21)作为第二电极引出部；所述电连接步 骤包括：
    将所述第一极耳(32)和所述第二极耳(33)分别与所述第一集流件(42)和所述第二集流件(43)焊接；
    将所述第二集流件(43)与所述端盖本体(21)电连接；
    使所述端盖本体(21)封闭所述开口(111)；
    将所述第一集流件(42)与所述第一电极引出部(22)从所述端盖组件(2)外部焊接。
  42. 根据权利要求41所述的制造方法，其中，所述容纳部(1)具有侧壁(111)，所述容纳部(1)与所述端盖本体(21)电连接，将所述第二集流件(43)与所述端盖本体(21)电连接的步骤包括：
    使所述第二集流件(43)与所述侧壁(11)电连接，且所述侧壁(11)与所述端盖本体(21)电连接。
  43. 根据权利要求42所述的制造方法，其中，所述第二集流件(43)与所述侧壁(11)从所述容纳部(1)的内侧焊接。
  44. 根据权利要求42或43所述的制造方法，其中，所述第二集流件(43)包括：第三部(431)，与所述第二极耳(33)电连接；和第四部(432)，至少连接于所述第三部(431)靠近所述容纳部(1)的边缘，所述第四部(432)与所述侧壁(111)电连接；所述制造方法还包括：
    在将所述集流组件(4)放入所述容纳部(1)前，所述第四部(432)与所述第三部(431)之间呈钝角。
PCT/CN2022/125655 2022-10-17 2022-10-17 电池单体及其制造方法、电池及用电装置 Ceased WO2024082091A1 (zh)

Priority Applications (4)

Application Number Priority Date Filing Date Title
CN202280086422.8A CN118476091A (zh) 2022-10-17 2022-10-17 电池单体及其制造方法、电池及用电装置
PCT/CN2022/125655 WO2024082091A1 (zh) 2022-10-17 2022-10-17 电池单体及其制造方法、电池及用电装置
EP22962289.9A EP4510320A4 (en) 2022-10-17 2022-10-17 BATTERY CELL AND METHOD FOR MANUFACTURING SAME, BATTERY AND ELECTRICAL DEVICE
US18/944,014 US20250070431A1 (en) 2022-10-17 2024-11-12 Battery cell, method for manufacturing battery cell, battery, and electric device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2022/125655 WO2024082091A1 (zh) 2022-10-17 2022-10-17 电池单体及其制造方法、电池及用电装置

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US18/944,014 Continuation US20250070431A1 (en) 2022-10-17 2024-11-12 Battery cell, method for manufacturing battery cell, battery, and electric device

Publications (1)

Publication Number Publication Date
WO2024082091A1 true WO2024082091A1 (zh) 2024-04-25

Family

ID=90736506

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2022/125655 Ceased WO2024082091A1 (zh) 2022-10-17 2022-10-17 电池单体及其制造方法、电池及用电装置

Country Status (4)

Country Link
US (1) US20250070431A1 (zh)
EP (1) EP4510320A4 (zh)
CN (1) CN118476091A (zh)
WO (1) WO2024082091A1 (zh)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN118541856A (zh) * 2022-10-17 2024-08-23 宁德时代新能源科技股份有限公司 电池单体、电池及用电装置

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2021022482A (ja) * 2019-07-26 2021-02-18 株式会社豊田自動織機 蓄電装置
CN114792868A (zh) * 2022-04-20 2022-07-26 江苏正力新能电池技术有限公司 一种圆柱电池及其制备方法、电池包
CN115051084A (zh) * 2022-06-16 2022-09-13 东莞正力新能电池技术有限公司 一种圆柱电池与电池模组

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8394525B2 (en) * 2010-06-22 2013-03-12 Ford Global Technologies, Llc Support assembly for an array of battery cells
EP4289022A4 (en) * 2021-02-10 2024-10-30 Gotion, Inc. Cylindrical battery cell, battery and method for forming cylindrical battery cell
CN215989120U (zh) * 2021-07-29 2022-03-08 宁德时代新能源科技股份有限公司 方形电池单体、电池及用电设备
CN116583998B (zh) * 2021-11-26 2025-10-31 宁德时代新能源科技股份有限公司 电池单体、电池、用电设备及电池单体的制造方法和设备
CN217562636U (zh) * 2022-04-18 2022-10-11 江苏正力新能电池技术有限公司 一种圆柱电池与电池包
CN114899500B (zh) * 2022-05-31 2025-06-03 天津力神电池股份有限公司 正负极同侧极耳的圆柱型锂离子电池制备方法
CN114976404A (zh) * 2022-07-05 2022-08-30 湖北亿纬动力有限公司 一种电池
CN219180726U (zh) * 2022-09-20 2023-06-13 江苏正力新能电池技术有限公司 一种集流构件及圆柱电池

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2021022482A (ja) * 2019-07-26 2021-02-18 株式会社豊田自動織機 蓄電装置
CN114792868A (zh) * 2022-04-20 2022-07-26 江苏正力新能电池技术有限公司 一种圆柱电池及其制备方法、电池包
CN115051084A (zh) * 2022-06-16 2022-09-13 东莞正力新能电池技术有限公司 一种圆柱电池与电池模组

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP4510320A4 *

Also Published As

Publication number Publication date
CN118476091A (zh) 2024-08-09
EP4510320A1 (en) 2025-02-19
US20250070431A1 (en) 2025-02-27
EP4510320A4 (en) 2025-09-17

Similar Documents

Publication Publication Date Title
CN218887468U (zh) 电池单体、电池及用电装置
CN112768845B (zh) 电池单体及其制造方法和制造系统、电池以及用电装置
CN214203812U (zh) 电池单体、电池以及用电装置
WO2023025104A1 (zh) 电池单体、电池以及用电装置
CN215578764U (zh) 电池单体、电池以及用电装置
CN219144330U (zh) 电池单体、电池及用电装置
CN116018718B (zh) 电池单体及其制造方法和制造系统、电池以及用电装置
CN211045490U (zh) 二次电池及用于其的顶盖组件、电池模块和装置
US20240283059A1 (en) Battery cell, method and system for manufacturing battery cell, battery, and electrical device
CN216250906U (zh) 电池单体、电池和用电设备
US20250349992A1 (en) Battery cell, battery, and electric apparatus
CN118630432A (zh) 电池、电池模组及用电设备
CN218997009U (zh) 电池单体、电池以及用电装置
US20250070431A1 (en) Battery cell, method for manufacturing battery cell, battery, and electric device
CN117117426A (zh) 电池单体及电池模块
US20250279553A1 (en) Battery cell, battery and electrical apparatus
US20250279555A1 (en) Battery cell, battery and electric apparatus
CN221102217U (zh) 电池单体、电池及用电设备
CN221262544U (zh) 储能装置及用电设备
CN220527148U (zh) 电池芯包、电池模组和电池包
CN220021553U (zh) 电池单体、电池及用电装置
CN118117222A (zh) 蓄电装置
WO2024178553A1 (zh) 电池单体、电池及用电装置
CN116544570B (zh) 电池单体、电池及用电装置
CN220963654U (zh) 端盖组件、电池单体、电池及用电设备

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 22962289

Country of ref document: EP

Kind code of ref document: A1

WWE Wipo information: entry into national phase

Ref document number: 202280086422.8

Country of ref document: CN

WWE Wipo information: entry into national phase

Ref document number: 2022962289

Country of ref document: EP

ENP Entry into the national phase

Ref document number: 2022962289

Country of ref document: EP

Effective date: 20241115

NENP Non-entry into the national phase

Ref country code: DE