WO2023028815A1 - 卷绕式电极组件、电池单体、电池及用电设备 - Google Patents

卷绕式电极组件、电池单体、电池及用电设备 Download PDF

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Publication number
WO2023028815A1
WO2023028815A1 PCT/CN2021/115572 CN2021115572W WO2023028815A1 WO 2023028815 A1 WO2023028815 A1 WO 2023028815A1 CN 2021115572 W CN2021115572 W CN 2021115572W WO 2023028815 A1 WO2023028815 A1 WO 2023028815A1
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WIPO (PCT)
Prior art keywords
tabs
tab
width
electrode assembly
winding
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Application number
PCT/CN2021/115572
Other languages
English (en)
French (fr)
Inventor
温耀铃
罗忠平
林文法
Original Assignee
宁德时代新能源科技股份有限公司
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Filing date
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Application filed by 宁德时代新能源科技股份有限公司 filed Critical 宁德时代新能源科技股份有限公司
Priority to KR1020237008779A priority Critical patent/KR20230051257A/ko
Priority to JP2023515864A priority patent/JP2023543681A/ja
Priority to EP21955296.5A priority patent/EP4195399A1/en
Priority to CN202180082913.0A priority patent/CN116686157A/zh
Priority to PCT/CN2021/115572 priority patent/WO2023028815A1/zh
Publication of WO2023028815A1 publication Critical patent/WO2023028815A1/zh
Priority to US18/181,597 priority patent/US20230216077A1/en

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H01M10/0404—Machines for assembling batteries
    • H01M10/0409—Machines for assembling batteries for cells with wound 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
    • H01M50/531—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
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • 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
    • H01M10/052—Li-accumulators
    • 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
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/202—Casings or frames around the primary casing of a single cell or a single battery
    • 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
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/247—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders specially adapted for portable devices, e.g. mobile phones, computers, hand tools or pacemakers
    • 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
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/249—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders specially adapted for aircraft or vehicles, e.g. cars or trains
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/533—Electrode connections inside a battery casing characterised by the shape of the leads or tabs
    • 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
    • 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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Definitions

  • the present application relates to the technical field of batteries, in particular, to a wound electrode assembly, a battery cell, a battery, electrical equipment, and a manufacturing method and equipment for the wound electrode assembly.
  • lithium-ion batteries are widely used in vehicles, portable appliances, mobile phones, spacecraft and other fields to provide electrical energy for them.
  • Embodiments of the present application provide a wound electrode assembly, a battery cell, a battery, an electrical device, and a manufacturing method and device for the wound electrode assembly, so as to reduce the risk of internal short circuits in the battery.
  • the embodiment of the present application provides a wound electrode assembly, including: a pole piece, the pole piece includes a winding end section, and the winding end section is provided with a plurality of first tabs, and a plurality of the The first tabs are stacked, and among the two adjacent first tabs, the width of the first tab near the winding center of the wound electrode assembly is larger than that of the first tab away from the winding center. The width of the lug.
  • a plurality of first tabs are stacked, and the width of two adjacent first tabs close to the winding center is larger than that of the first tab away from the winding center.
  • the widths of multiple first tabs gradually decrease, and after the winding of the winding end section is completed, along the width direction of the first tabs, the misalignment of two adjacent first tabs decreases,
  • the total displacement of the plurality of first tabs is relatively small, reducing the short circuit risk caused by the large displacement of the plurality of first tabs in the width direction of the first tab of the electrode assembly, and improving the reliability of the battery cell. safety performance.
  • the total amount of misalignment shown by multiple first tabs is small, so the same connection area can correspond to more first tabs, which is conducive to increasing the size of the electrode assembly in the thickness direction and improving the energy density of the battery cell. .
  • the pole piece further includes a winding start section connected to the winding end section, the winding start section is provided with a second tab, and the first Two tabs are stacked with multiple first tabs; the width of the second tab is greater than or equal to that of the first tab closest to the winding center among the multiple first tabs width.
  • the width of the second tab is larger than Or the width equal to the plurality of first tabs can make the tabs of the electrode assembly have better current flow capability and better heat dissipation capability without affecting the total displacement of the tabs of the electrode assembly.
  • the multiple second tabs are stacked, and the widths of the multiple second tabs are equal.
  • the plurality of second tabs have the same width, which is not only convenient for manufacture, but also enables the tabs to have better flow capacity and heat dissipation capacity.
  • the number of the second tabs is less than or equal to 25.
  • the number of the second tab is less than or equal to 25, which can effectively reduce the number of the first tab and the second pole.
  • the total dislocation of the ears along the width direction of the first tab reduces the short circuit risk caused by the large dislocation of multiple first tabs in the width direction of the first tab.
  • the number of the second tabs is multiple, and the multiple second tabs are stacked, and among the two adjacent second tabs, the The width of the second tab at the winding center is greater than the width of the second tab away from the winding center.
  • the plurality of second tabs are stacked in the same direction as the stacking direction of the multiple first tabs, and the width of two adjacent second tabs close to the winding center is larger than that far away from the winding center.
  • the second tab at the winding center in other words, from the inside to the outside, the width of the plurality of second tabs gradually decreases, so that the second tab has better current flow capacity and better heat dissipation capacity.
  • the first tab has a connection end and a free end, and along the width direction of the pole piece, the connection end is connected to one end of the winding end section; In the direction from the connecting end to the free end, the width of each of the plurality of first tabs decreases gradually.
  • the width difference between two adjacent first tabs is equal.
  • the width difference between two adjacent first tabs is equal, that is, along the direction in which the first tabs deviate from the winding center, the widths of multiple first tabs decrease linearly, which can reduce the width of multiple first tabs.
  • the total dislocation of one tab along the width direction of the first tab reduces the short circuit risk caused by the large dislocation of multiple first tabs in the width direction of the first tab.
  • the width difference between two adjacent first tabs gradually increases, which can reduce the total misalignment of multiple first tabs along the width direction of the first tabs, and reduce the number of first tabs.
  • a large amount of misalignment of the lug in the width direction of the first lug results in a short circuit risk of the electrode assembly.
  • the width difference of the first tab is 0.5mm-4mm.
  • the width difference between two adjacent first tabs is 0.5mm-4mm, which can effectively reduce the short circuit caused by the large displacement of multiple first tabs in the width direction of the first tab. Risk, but also to ensure the flow capacity and heat dissipation capacity of the first tab. If the width difference between two adjacent first tabs is less than 0.5 mm, the width of the first tab far from the winding center among the two adjacent first tabs is relatively the width of the first tab near the winding center The reduction in the width of the first tab is not obvious, and finally the total dislocation of multiple first tabs is not significantly reduced, which cannot effectively reduce the risk of short circuit caused by the large dislocation of multiple first tabs in the width direction of the first tab.
  • the width difference between two adjacent first tabs is greater than 4 mm, the width of the first tab far from the winding center among the two adjacent first tabs is relatively the width of the first tab near the winding center The reduction in the width of the pin is too large, and it is difficult to ensure the overcurrent capability and heat dissipation capability of the first tab.
  • the multiple first tabs in the stacking direction of the multiple first tabs, along the direction that the multiple first tabs are away from the winding center, the multiple first tabs The height gradually decreases.
  • the heights of the multiple first tabs gradually decrease along the direction in which the multiple first tabs deviate from the winding center, that is, the width and height of the first tabs decrease synchronously, reducing the first tab due to Risk of easy folding after reduced width.
  • the ratio of the width to the height of each of the plurality of first tabs is the same.
  • the ratio of the width to the height of each first tab among the plurality of first tabs is the same, and after the width of the first tab decreases, the height of the first tab decreases synchronously, lowering the first pole Risk of ear folding due to reduced width.
  • the distance between two adjacent first tabs increases gradually.
  • the distance between two adjacent first tabs gradually increases, which can reduce the misalignment of two adjacent first tabs, thereby The risk of short circuit caused by the large dislocation of the first tabs along the width direction of the first tabs is reduced.
  • an embodiment of the present application provides a battery cell, including a casing and the wound electrode assembly provided in the embodiment of the first aspect, and the wound electrode assembly is accommodated in the casing.
  • the widths of the plurality of first lugs in the winding end section gradually decrease, then after the winding end section is wound, along the width direction of the first lug, two adjacent tabs
  • the misalignment of each first tab is reduced, so that the total misalignment of multiple first tabs is small, and the error caused by the large misalignment of multiple first tabs in the width direction of the first tab is reduced. Risk of short circuit.
  • the total dislocation of multiple first tabs is small, so the same connection area can correspond to more first tabs, which is beneficial to increase the size of the electrode assembly in the thickness direction and improve the energy density of the battery cell.
  • an embodiment of the present application provides a battery, including a box body and a battery cell provided according to the embodiment of the second aspect, and the battery cell is accommodated in the box body.
  • the widths of the plurality of first lugs in the winding end section gradually decrease, then after the winding end section is wound, along the width direction of the first lug, two adjacent tabs
  • the amount of dislocation of each first tab is reduced, so that the total amount of dislocation shown by multiple first tabs is small, and the error caused by the large amount of dislocation of multiple first tabs in the width direction of the first tab is reduced.
  • the risk of short circuit can also improve the safety performance of the battery.
  • the total dislocation amount exhibited by multiple first tabs is small, so the same connection area can correspond to more first tabs, which is beneficial to increase the size of the electrode assembly in the thickness direction and improve the energy density of the battery.
  • an embodiment of the present application provides an electric device, including the battery cell provided in the embodiment of the second aspect.
  • the total dislocation amount exhibited by the plurality of first tabs is small, which reduces the short circuit risk caused by the large dislocation amount of the multiple first tabs in the width direction of the first tab, and can also improve the battery life. Improve the safety performance of the body and improve the safety of electrical equipment. Moreover, the total amount of dislocation exhibited by multiple first tabs is small, so the same area can correspond to more first tabs, which is beneficial to increase the size of the electrode assembly in the thickness direction, increase the energy density of the battery cell, and To meet the greater and longer power demand of electrical equipment.
  • the embodiment of the present application provides a method for manufacturing a wound electrode assembly, including:
  • the pole piece includes a winding end section, and the winding end section is provided with a plurality of first tabs;
  • the width of the first tab near the winding center of the wound electrode assembly is greater than the width of the first tab far away from the winding center.
  • the pole piece is wound around the winding center, so that a plurality of the first tabs are stacked, and the total misalignment shown by the multiple first tabs is small, reducing the The short-circuit risk caused by the large amount of misalignment of the lug in the width direction of the first lug can also improve the safety performance of the battery cell and improve the safety of electric equipment.
  • the total dislocation amount of multiple first tabs is small, so the same area can correspond to more first tabs, which is beneficial to increase the size of the electrode assembly in the thickness direction and improve the energy density of the battery cell.
  • the embodiment of the present application provides a manufacturing equipment for a wound electrode assembly, including a providing device and an assembling device.
  • the providing device is configured to provide a pole piece comprising a winding end section provided with a plurality of first tabs.
  • the assembling device is configured to wind the pole pieces around the winding center so that a plurality of the first tabs are stacked. Wherein, among the two adjacent first tabs, the width of the first tab near the winding center of the wound electrode assembly is greater than the width of the first tab far away from the winding center.
  • the assembling device winds the pole pieces around the winding center so that the plurality of first tabs are stacked, and the total displacement of the plurality of first tabs is small, reducing the The short-circuit risk caused by the large dislocation of the first tab in the width direction of the first tab can also improve the safety performance of the battery cell and improve the safety of electric equipment. Moreover, the total dislocation amount of multiple first tabs is small, so the same area can correspond to more first tabs, which is beneficial to increase the size of the electrode assembly in the thickness direction and improve the energy density of the battery cell.
  • Fig. 1 is a schematic structural diagram of a vehicle provided by some embodiments of the present application.
  • Fig. 2 is a schematic structural diagram of a battery provided by some embodiments of the present application.
  • Fig. 3 is a schematic structural diagram of a plurality of battery cells connected through a confluence component provided by some embodiments of the present application;
  • Fig. 4 is an exploded view of a battery cell provided by some embodiments of the present application.
  • Fig. 5 is a schematic structural diagram of a wound electrode assembly provided by some embodiments of the present application.
  • Fig. 6 is the enlarged view of I place in Fig. 5;
  • Fig. 7 is a schematic diagram of the expansion of the pole piece provided by some embodiments of the present application.
  • Fig. 8 is a schematic diagram of the expansion of pole pieces provided by some other embodiments of the present application.
  • Fig. 9 is a schematic diagram of the expansion of pole pieces provided by other embodiments of the present application.
  • Fig. 10 is a schematic structural diagram of an electrode assembly provided in some other embodiments of the present application.
  • Figure 11 is an enlarged view of II in Figure 10;
  • Fig. 12 is a schematic structural diagram of an electrode assembly provided in some further embodiments of the present application.
  • Figure 13 is an enlarged view of II in Figure 12;
  • Fig. 14 is a flowchart of a manufacturing method of a wound electrode assembly provided by some embodiments of the present application.
  • Fig. 15 is a schematic structural diagram of the manufacturing equipment of the wound electrode assembly provided by some embodiments of the present application.
  • Icons 1000-vehicle; 100-battery; 10-box; 11-accommodating space; 12-first part; 13-second part; 20-battery unit; 21-housing; 211-opening; 22-end cover Assembly; 221-end cover; 222-first electrode terminal; 223-second electrode terminal; 224-current collecting part; 224a-first current collecting part; 224b-second current collecting part; 225-pressure relief mechanism; -electrode assembly; 231-pole piece; 2311-positive pole ear; 2312-negative pole ear; 2313-winding end section; 2314-first pole ear; 23141-connecting end; 2316-Second tab; 30-Combining parts; 200-Controller; 300-Motor; 2000-Manufacturing equipment of winding electrode assembly; B-the axial direction of the electrode assembly; C-the thickness direction of the electrode assembly; D-the winding direction; E-the length direction of the pole piece; F-the width direction of the pole piece; P
  • the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship that is usually placed when the product of the application is used, or the orientation or positional relationship of this application.
  • Orientations or positional relationships commonly understood by those skilled in the art are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood For the limitation of this application.
  • the terms “first”, “second”, “third”, etc. are only used for distinguishing descriptions, and should not be construed as indicating or implying relative importance.
  • the wound electrode assembly is formed by stacking and winding a positive electrode sheet, a separator and a negative electrode sheet.
  • the stacked arrangement of the positive tabs of the positive electrode sheet requires each positive tab to be completely overlapped or the misalignment is controlled within a certain range
  • the stacked arrangement of the negative tabs of the negative electrode sheet requires that each negative tab is completely overlapped or the misalignment is controlled within a certain range.
  • the winding radius of the pole piece becomes larger and larger, resulting in a larger total misalignment of the positive electrode tab and/or the negative electrode tab.
  • the large amount of misalignment of the tabs will lead to many problems.
  • the large amount of misalignment of the tabs will reduce the distance between the positive and negative tabs, increase the risk of short circuit, and affect the safety of the battery cell;
  • the large total misalignment of the ears leads to a small overlapping area between the tabs, which reduces the welding area with other components (such as electrode terminals, end caps, current collecting components, etc.), thereby reducing the flow area and affecting the battery cell. body security.
  • the inventor designed an electrode assembly after in-depth research, by stacking and arranging a plurality of first tabs in the winding end section of the pole piece, and two adjacent first poles In the ear, the width of the first tab near the winding center of the wound electrode assembly is greater than the width of the first tab away from the winding center, in other words, from the inside to the outside, the width of the plurality of first tabs Gradually decreasing, the misalignment of two adjacent first tabs decreases, so that the total misalignment exhibited by multiple first tabs is smaller, thereby reducing the risk of short circuit. Moreover, the total amount of misalignment shown by multiple first tabs is small, so the same connection area can correspond to more first tabs, which is conducive to increasing the size of the electrode assembly in the thickness direction and improving the energy density of the battery cell. .
  • Electrical devices can be vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys and power tools, etc.
  • Vehicles can be fuel vehicles, gas vehicles or new energy vehicles, and new energy vehicles can be pure electric vehicles, hybrid vehicles or extended-range vehicles;
  • spacecraft include airplanes, rockets, space shuttles and spacecraft, etc.;
  • electric toys include fixed Type or mobile electric toys, such as game consoles, electric car toys, electric boat toys and electric airplane toys, etc.;
  • electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools and railway electric tools, for example, Electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, electric planers, and more.
  • the embodiment of the present application does not impose special limitations on the above electric equipment.
  • FIG. 1 is a schematic structural diagram of a vehicle 1000 provided by some embodiments of the present application.
  • the vehicle 1000 can be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle.
  • the interior of the vehicle 1000 is provided with a battery 100 , and the battery 100 may be provided at the bottom, head or tail of the vehicle 1000 .
  • the battery 100 can be used for power supply of the vehicle 1000 , for example, the battery 100 can be used as an operating power source of the vehicle 1000 .
  • the vehicle 1000 may further include a controller 200 and a motor 300 , the controller 200 is used to control the battery 100 to supply power to the motor 300 , for example, for starting, navigating and running the vehicle 1000 .
  • the battery 100 can not only be used as an operating power source for the vehicle 1000 , but can also be used as a driving power source for the vehicle 1000 to provide driving power for the vehicle 1000 instead of or partially replacing fuel oil or natural gas.
  • FIG. 2 is a schematic structural diagram of a battery 100 provided by some embodiments of the present application.
  • the battery 100 includes a case 10 and battery cells 20 , and the battery cells 20 are accommodated in the case 10 .
  • the box body 10 is used to provide an accommodating space 11 for the battery cells 20 .
  • the box body 10 may include a first part 12 and a second part 13 , and the first part 12 and the second part 13 cover each other to define an accommodating space 11 for accommodating the battery cells 20 .
  • the connection between the first part 12 and the second part 13 can be sealed by a sealing member (not shown in the figure), and the sealing member can be a sealing ring, a sealant, or the like.
  • the first part 12 and the second part 13 can be in various shapes, such as cuboid, cylinder and so on.
  • the first part 12 can be a hollow structure with one side open, and the second part 13 can also be a hollow structure with one side open. Box 10.
  • the first part 12 may also be a hollow structure with one side open, the second part 13 may be a plate-like structure, and the second part 13 covers the open side of the first part 12 to form the box body 10 with the accommodation space 11 .
  • the battery 100 there may be one or a plurality of battery cells 20 . If there are multiple battery cells 20 , the multiple battery cells 20 may be connected in series, in parallel or in parallel.
  • the mixed connection means that the multiple battery cells 20 are both in series and in parallel.
  • a plurality of battery cells 20 can be directly connected in series or in parallel or mixed together, and then the whole composed of a plurality of battery cells 20 is housed in the box 10; of course, a plurality of battery cells 20 can also be connected in series first
  • a battery module is formed by connecting in parallel or in series, and multiple battery modules are connected in series or in parallel or in series to form a whole, and are accommodated in the box 10 .
  • the battery cell 20 may be in the form of a cylinder, a flat body, a cuboid or other shapes.
  • FIG. 2 exemplarily shows the case where the battery cell 20 is in a square shape.
  • FIG. 3 is a schematic structural diagram of a plurality of battery cells 20 connected through a bus component 30 provided by some embodiments of the present application.
  • the battery 100 may further include a confluence component 30 , through which the plurality of battery cells 20 may be electrically connected, so as to realize series, parallel or mixed connection of the plurality of battery cells 20 .
  • FIG. 4 is an exploded view of a battery cell 20 provided by some embodiments of the present application.
  • the battery cell 20 may include a case 21 , an end cap assembly 22 and an electrode assembly 23 .
  • the casing 21 has an opening 211
  • the electrode assembly 23 is accommodated in the casing 21
  • the end cap assembly 22 is used to cover the opening 211 .
  • the housing 21 can be in various shapes, such as cylinder, cuboid and so on.
  • the shape of the casing 21 can be determined according to the specific shape of the electrode assembly 23 .
  • the shell 21 can be a cylindrical structure; if the electrode assembly 23 is a rectangular parallelepiped, the shell 21 can be a rectangular parallelepiped.
  • FIG. 5 exemplarily shows the case where the casing 21 and the electrode assembly 23 are square.
  • the housing 21 may also be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, etc., which are not particularly limited in this embodiment of the present application.
  • the end cap assembly 22 is used to cover the opening 211 of the casing 21 to form a closed accommodating cavity (not shown in the figure), and the accommodating cavity is used to accommodate the electrode assembly 23 .
  • the holding chamber is also used to hold electrolyte, such as electrolytic solution.
  • the end cover assembly 22 is used as a component for outputting the electric energy of the electrode assembly 23.
  • the electrode terminals in the end cover assembly 22 are used to electrically connect with the electrode assembly 23, that is, the electrode terminals are electrically connected to the tabs of the electrode assembly 23.
  • the electrode terminal and the tab are connected through the current collecting component 224 to realize the electrical connection between the electrode terminal and the tab.
  • the end cover assembly 22 can also be one, and then two electrode terminals can be arranged in the end cover assembly 22, and the two electrode terminals are respectively used to connect with the positive pole lug 2311 and the negative pole of the electrode assembly 23.
  • the ear 2312 is electrically connected, and the two electrode terminals in the end cap assembly 22 are respectively a positive electrode terminal and a negative electrode terminal.
  • the two openings 211 of the housing 21 for example, the two openings 211 are arranged on opposite sides of the housing 21, there may also be two end cover assemblies 22, and the two end cover assemblies 22 are respectively covered on the housing 21. at the two openings 211.
  • the electrode terminal in one end cap assembly 22 may be a positive electrode terminal for electrical connection with the positive electrode tab 2311 of the electrode assembly 23; the electrode terminal in the other end cap assembly 22 may be a negative electrode terminal , for electrical connection with the negative tab 2312 of the electrode assembly 23 .
  • the battery cell 20 has an end cover assembly 22, and the end cover 221 is provided with a first electrode terminal 222 for electrically connecting with the positive pole tab 2311 and a second electrode terminal 222 for electrically connecting with the negative pole tab 2312.
  • the electrode terminal 223 is on.
  • the battery cell 20 also includes a first current collecting part 224a and a second current collecting part 224b, the positive electrode tab 2311 is electrically connected to the first electrode terminal 222 through the first current collecting part 224a, the negative electrode tab 2312 is connected to the second electrode terminal 223 is electrically connected through the second current collecting component 224b.
  • the end cap assembly 22 is also provided with a pressure relief mechanism 225 for actuating to release the pressure inside the battery cell 20 when the temperature or pressure inside the battery cell 20 reaches a threshold.
  • the pressure relief mechanism 225 can take the form of an explosion-proof valve, a burst disk, an air valve, a pressure relief valve, or a safety valve, and can specifically use a pressure-sensitive or temperature-sensitive element or structure, that is, when the internal pressure of the battery cell 20 Or when the temperature reaches a predetermined threshold, the pressure relief mechanism 225 performs an action or the weak structure provided in the pressure relief mechanism 225 is destroyed, thereby forming an opening or channel for internal pressure or temperature relief.
  • Figure 5 is a schematic structural view of a wound electrode assembly 23 provided by some embodiments of the present application
  • Figure 6 is an enlarged view of I in Figure 5
  • Figure 7 is some of the present application
  • the electrode assembly 23 is a wound electrode assembly 23
  • the wound electrode assembly 23 includes a pole piece 231 .
  • the pole piece 231 includes a winding end section 2313, and the winding end section 2313 is provided with a plurality of first tabs 2314, and the plurality of first tabs 2314 are stacked, and the adjacent two first tabs 2314 are close to the winding
  • the width of the first tab 2314 at the winding center of the type electrode assembly 23 is greater than the width of the first tab 2314 away from the winding center.
  • the wound electrode assembly 23 may include a positive electrode sheet, a negative electrode sheet, and a separator.
  • the wound electrode assembly 23 is a wound structure formed by winding a positive electrode sheet, a separator and a negative electrode sheet.
  • the separator is used to isolate the positive electrode sheet and the negative electrode sheet to reduce the risk of short circuit due to contact between the positive electrode sheet and the negative electrode sheet.
  • the number of turns that the winding end section 2313 extends from the winding end in the opposite direction of the winding direction is m
  • the total number of turns of the pole piece 231 is n, m ⁇ n, m>2, that is, the winding end section 2313 starts from
  • the number of turns that the winding end extends in the opposite direction to the winding direction D exceeds two turns, and at least one first tab 2314 can be provided on each winding end section 2313 .
  • the positive electrode sheet includes a positive electrode current collector and a positive electrode active material layer, the positive electrode active material layer is coated on the surface of the positive electrode current collector, and the positive electrode current collector that is not coated with the positive electrode active material layer protrudes from the positive electrode collector that has been coated with the positive electrode active material layer , the positive electrode current collector not coated with the positive electrode active material layer is used as the positive electrode tab 2311 .
  • the material of the positive electrode current collector can be aluminum
  • the positive electrode active material can be lithium cobaltate, lithium iron phosphate, ternary lithium or lithium manganate.
  • the negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer, the negative electrode active material layer is coated on the surface of the negative electrode current collector, and the negative electrode current collector that is not coated with the negative electrode active material layer protrudes from the negative electrode collector that has been coated with the negative electrode active material layer , the negative electrode collector not coated with the negative electrode active material layer is used as the negative electrode tab 2312 .
  • the material of the negative electrode current collector may be copper, and the negative electrode active material may be carbon or silicon. In order to ensure that a large current is passed without fusing, there are multiple positive tabs 2311 stacked together, and multiple negative tabs 2312 stacked together.
  • the material of the isolation film may be PP (polypropylene, polypropylene) or PE (polyethylene, polyethylene).
  • the positive electrode sheet has a positive electrode tab 2311, which can be a positive current collector that is not coated with a positive active material layer in the positive electrode sheet as the positive electrode tab 2311, and the negative electrode sheet has a negative electrode tab 2312, which can be an uncoated negative active material layer in the negative electrode sheet
  • the negative electrode current collector is used as the negative electrode tab 2312.
  • the positive electrode tab 2311 and the negative electrode tab 2312 of the wound electrode assembly 23 may be located at one end of the electrode assembly in the axial direction B, or located at both ends of the electrode assembly in the axial direction B respectively.
  • FIG. 5 shows a schematic structural diagram of the positive pole tab 2311 and the negative pole tab 2312 located at the same end of the electrode assembly in the axial direction B.
  • the positive electrode tab 2311 of the positive electrode sheet and the negative electrode tab 2312 of the negative electrode sheet are arranged at intervals along the length direction A of the electrode assembly.
  • the "pole piece 231" described in this embodiment can be a positive pole piece or a negative pole piece.
  • the first tab 2314 is a positive pole tab.
  • the first tab 2314 is the negative tab.
  • a plurality of first tabs 2314 stacked means that a plurality of first tabs 2314 are sequentially arranged along a straight line, and two adjacent first tabs 2314 are at least partially overlapped.
  • a plurality of first tabs 2314 are stacked along the thickness direction C of the electrode assembly, the plurality of first tabs 2314 are located on one side of the thickness central plane P of the electrode assembly 23 , and the thickness central plane of the electrode assembly 23 P refers to a plane that is coplanar with the winding central axis of the electrode assembly 23 and perpendicular to the thickness direction C of the electrode assembly; sides.
  • the width of the first tab 2314 is the maximum dimension of the first tab 2314 along the winding direction D
  • the misalignment of the first tab 2314 refers to the distance between two adjacent first poles.
  • the projections of the ears 2314 along the stacking direction of the first tabs 2314 are partially overlapped, and the total misalignment of the multiple first tabs 2314 refers to the maximum width of the projections of the multiple first tabs 2314 along the stacking direction of the first tabs 2314 .
  • the width of the first tab 2314 refers to the maximum dimension of the first tab 2314 along the length direction E (shown in FIG. 7 ) of the pole piece when the pole piece 231 is in the unfolded state.
  • a plurality of first tabs 2314 are stacked, and the width of two adjacent first tabs 2314 close to the winding center is larger than that of the first tab 2314 away from the winding center.
  • the width of a plurality of first tabs 2314 gradually decreases, and after the winding end section winding 2313 is completed, along the width direction of the first tabs 2314, the misalignment of two adjacent first tabs 2314 reduced, so that the total amount of misalignment exhibited by the plurality of first tabs 2314 is small, and the short circuit caused by the large amount of misalignment of the plurality of first tabs 2314 in the width direction of the first tab 2314 of the electrode assembly 23 is reduced risk, and improve the safety performance of the battery cell 20.
  • the tabs of the electrode assembly 23 will be electrically connected with other components (such as the current collecting component 224) by means of welding or the like, so as to extract electric energy, but the area of the current collecting component 224 for connection is limited, and the electrode assembly 23 The part of the tab beyond the connection area of the current collecting part 224 will not be able to connect with the current collecting part 224, which is likely to bring the risk of an internal short circuit of the battery cell 20.
  • the total amount of misalignment shown by the plurality of first tabs 2314 is small, so the same
  • the connecting area can correspond to more first tabs 2314, which is beneficial to increase the size of the electrode assembly in the thickness direction C, and can increase the energy density of the battery cell 20.
  • the pole piece 231 further includes a winding start section 2315 connected to the winding end section 2313 , the winding start section 2315 is provided with a second tab 2316 , and the second tab 2316 is stacked with a plurality of first tabs 2314; the width of the second tab 2316 is greater than or equal to the width of the first tab 2314 closest to the winding center among the plurality of first tabs 2314.
  • the winding start section 2315 is completed before the winding end section 2313, and the second tab 2316 is arranged on the winding start section 2315, so the second tab 2316 is opposite to the plurality of first tabs. 2314 is closer to the winding center of the electrode assembly 23 .
  • the winding start section 2315 extends from the winding start end of the pole piece 231 along the winding direction D for at least one turn, and each turn of the winding start section 2315 can be provided with at least one second tab 2316 .
  • the number of the second tab 2316 can be one or more.
  • "the second tab 2316 is stacked with multiple first tabs 2314" means that multiple second tabs 2316 are stacked, and multiple first tabs 2314 are stacked.
  • the direction in which the dipole tabs 2316 are stacked is the same as the direction in which the plurality of first tabs 2314 are stacked.
  • the first tab 2314 and the second tab 2316 belong to the same pole piece 231, so the polarity of the second tab 2316 and the first tab 2314 are the same, and the first tab 2314 is an embodiment of the positive tab 2311
  • the second tab 2316 is the positive tab 2311
  • the second tab 2316 is the negative tab 2312 .
  • each second tab 2316 is greater than the width of the innermost first tab 2314 of the plurality of first tabs 2314 . In some other embodiments, the width of each second tab 2316 is equal to the width of the innermost first tab 2314 of the plurality of second tabs 2316 .
  • the misalignment of the second tab 2316 on the winding start section 2315 of the electrode assembly 23 in the width direction of the second tab 2316 is relatively small, therefore, the width of the second tab 2316 is larger than Or equal to the width of the plurality of first tabs 2314 , without affecting the total displacement of the pole piece 231 , the tabs of the electrode assembly 23 have better flow capacity and better heat dissipation capacity.
  • the number of the second tabs 2316 is multiple, the multiple second tabs 2316 are stacked, and the widths of the multiple second tabs 2316 are equal.
  • the plurality of second tabs 2316 have the same width, which is not only convenient for manufacturing, but also enables the tabs to have better current flow capacity and heat dissipation capacity under the condition of matching the connection area of the current collecting component 224 .
  • the number of second tabs 2316 is less than or equal to 25.
  • the number of the second tabs 2316 is less than or equal to 25, including only the second tabs 2316 on the same side as the plurality of first tabs 2314 and stacked in the same direction as the plurality of first tabs 2314 .
  • the misalignment of the tab increases.
  • the number of the second tab 2316 is less than or equal to 25
  • the edge of the first tab 2314 of the electrode assembly 23 can be effectively reduced.
  • the total dislocation generated in the width direction of the first tab 2314 reduces the short circuit risk caused by the large dislocation of multiple first tabs 2314 in the width direction of the first tab 2314 .
  • the width of the second tab 2316 near the winding center is larger than The width of the second tab 2316 away from the center of the winding.
  • a plurality of second tabs 2316 are stacked in the same direction as the stacking direction of the multiple first tabs 2314, and the width of two adjacent second tabs 2316 near the center of the winding is larger than the width of the second tab 2316 away from the winding center.
  • the width of the plurality of second tabs 2316 gradually decreases, so that the second tab 2316 has better flow capacity and better heat dissipation capacity .
  • the first tab 2314 has a connection end 23141 and a free end 23142, along the width direction F of the pole piece, the connection end 23141 is connected to one end of the winding end section 2313; along the connection end In the direction from 23141 to the free end 23142, the width of each first tab 2314 in the plurality of first tabs 2314 decreases gradually.
  • the width direction F of the pole piece is consistent with the axial direction B of the electrode assembly 23, and when the pole piece 231 is in the unfolded state, the width direction F of the pole piece is perpendicular to the length of the pole piece Direction E.
  • the free end 23142 of the first tab 2314 refers to an end opposite to the connection end 23141 and not connected to the winding end section 2313 .
  • the width of each first tab 2314 in the plurality of first tabs 2314 gradually decreases, for example, the first tab 2314 is an isosceles trapezoid or a right-angle trapezoid wait.
  • each first tab 2314 gradually decreases to avoid interference with other components.
  • connection strength between the first tab 2314 and the winding end section 2313 is increased on the basis of the area.
  • each first tab 2314 is equal.
  • the width difference between two adjacent first tabs 2314 is equal.
  • the width difference between two adjacent first tabs 2314 means that, taking a first tab 2314 as a reference, the width difference between the first tab 2314 and the first tab 2314 inside it is equal to the first tab 2314. There is a difference in width between the tab 2314 and the first tab 2314 outside it.
  • the width of the multiple first tabs 2314 decreases linearly, which can reduce the total misalignment of the multiple first tabs 2314 along the width direction of the first tab 2314 , reducing the risk of short circuit caused by the large amount of misalignment of the plurality of first tabs 2314 in the width direction of the first tabs 2314 .
  • FIG. 8 is a schematic diagram of an expanded pole piece 231 provided in some other embodiments of the present application.
  • the width difference between two adjacent first tabs 2314 gradually increases .
  • the width difference between two adjacent first tabs 2314 gradually increases means that, taking one first tab 2314 as a reference, the width difference between the first tab 2314 and the first tab 2314 inside it is smaller than the There is a difference in width between the first tab 2314 and the first tab 2314 outside it.
  • the quadratic relationship of the widths of the plurality of first tabs 2314 increases, so that the width difference between two adjacent first tabs 2314 gradually increases. Large, can reduce the total dislocation amount of multiple first tabs 2314 along the width direction of the first tab 2314, and reduce risk of short circuit.
  • the width difference between two adjacent first tabs 2314 is 0.5mm -4mm.
  • the width difference between two adjacent first tabs 2314 is 0.5mm-4mm, which can effectively reduce the short circuit risk caused by the large dislocation of multiple first tabs 2314 along the width direction of the first tab 2314 , and can also ensure the overcurrent capability and heat dissipation capability of the first tab 2314.
  • the width difference between two adjacent first tabs 2314 is less than 0.5 mm, the width of the first tab 2314 far away from the winding center among the two adjacent first tabs 2314 is relatively close to the winding center.
  • the width of one tab 2314 is not significantly reduced, and finally the total displacement of multiple first tabs 2314 is not significantly reduced, which cannot effectively reduce the misalignment of multiple first tabs 2314 in the width direction of the first tab 2314.
  • the risk of short circuit caused by a large quantity if the width difference between two adjacent first tabs 2314 is greater than 4mm, the width of the first tab 2314 away from the winding center among the two adjacent first tabs 2314 is relatively The width of a first tab 2314 close to the winding center is too reduced, and it is difficult to ensure the flow capacity and heat dissipation capability of the first tab 2314 .
  • the heights of the multiple first tabs 2314 gradually increase. decrease.
  • the height of the first tab 2314 refers to the maximum dimension between the free end 23142 of the first tab 2314 and the connection end 23141 of the first tab 2314 .
  • the heights of the first tabs 2314 may be the same or not.
  • the heights of the plurality of first tabs 2314 gradually decrease, that is, the width and height of the first tabs 2314 decrease synchronously, reducing the width of the first tabs 2314 Reduces the risk of easy tipping over.
  • the ratio of the width to the height of each first tab 2314 in the plurality of first tabs 2314 is the same.
  • the ratio of the width to the height of each first tab 2314 in the plurality of first tabs 2314 is the same, in other words, after the width of the first tab 2314 decreases, the height of the first tab 2314 decreases synchronously, and The risk of the first tab 2314 being easily folded due to the reduced width.
  • the heights of the multiple first tabs 2314 may be the same. In some other embodiments, the ratio of the width to the height of each first tab 2314 in the plurality of first tabs 2314 may be different.
  • the distance between two adjacent first tabs 2314 gradually increases.
  • the distance between two adjacent first tabs 2314 means, along the winding direction D of the wound electrode assembly 23, the distance between the first tabs 2314 The distance between the center position of and the center position of the first tab 2314 adjacent to it.
  • the distance between two adjacent first pole lugs 2314 refers to the center of the two adjacent first pole lugs 2314 along the length direction E of the pole piece The distance between the position and the center position of the first tab 2314 adjacent to it.
  • the distance between two adjacent first tabs 2314 along the winding direction D of the wound electrode assembly 23 can be defined by other references, but when defining any adjacent The same reference should be used for the distance of the two first tabs 2314 along the winding direction D.
  • Q1, Q2 and Q3 in the figure are respectively the middle positions of the three first tabs 2314 in the length direction E of the pole piece, and the distance between Q1 and Q2 is L1, between Q2 and Q3.
  • the distance is L2
  • the distance between two adjacent first tabs 2314 gradually increases means that L2 is greater than L1.
  • the winding direction D is consistent with the length direction E of the pole piece.
  • the distance between two adjacent first tabs 2314 gradually increases, which can reduce the misalignment of two adjacent first tabs 2314, thereby reducing the The risk of short circuit caused by the large misalignment of 2314 in the width direction of the first tab 2314 .
  • FIG. 9 is a schematic diagram of an expanded pole piece 231 provided by other embodiments of the present application.
  • each first tab 2314 has the same height.
  • the projection of the first tab 2314 with a smaller width along the stacking direction of the first tab 2314 falls into the projection of the first tab 2314 with a larger width along the first tab 2314 Within the projection range in the stacking direction, and along the width direction of the first tab 2314, both ends of the first tab 2314 with a larger width exceed both ends of the first tab 2314 with a smaller width, and the width is larger
  • the two ends of the first tab 2314 are equal to the values beyond the two ends of the first tab 2314 with smaller width.
  • FIG. 10 is a schematic structural diagram of an electrode assembly 23 provided in some embodiments of the present application
  • FIG. 11 is an enlarged view of II in FIG. 10 .
  • the projection of the first tab 2314 with a smaller width along the stacking direction of the first tab 2314 falls into the projection of the first tab 2314 with a larger width along the first tab 2314
  • the values at which both ends of the first tab 2314 with a larger width exceed both ends of the first tab 2314 with a smaller width are not equal.
  • the projection of the first tab 2314 with a smaller width along the stacking direction of the first tab 2314 falls into the projection of the first tab 2314 with a larger width.
  • one end of the first tab 2314 with a larger width exceeds one end of the first tab 2314 with a smaller width, and the end of the first tab 2314 with a larger width The other end is flush with the other end of the first tab 2314 with a smaller width.
  • FIG. 12 is a schematic structural view of the electrode assembly 23 provided by some other embodiments of the present application.
  • FIG. 13 is an enlarged view of II in FIG.
  • the projection portion of the smaller first tab 2314 along the stacking direction of the first tab 2314 falls within the projection range of the first tab 2314 with a larger width along the stacking direction of the first tab 2314, along the first tab 2314 In the width direction of a tab 2314, one end of the first tab 2314 with a larger width exceeds one end of the first tab 2314 with a smaller width, and the other end of the first tab 2314 with a smaller width exceeds the first tab 2314 with a larger width.
  • the other end of a pole ear 2314 is a schematic structural view of the electrode assembly 23 provided by some other embodiments of the present application.
  • FIG. 13 is an enlarged view of II in FIG.
  • the projection portion of the smaller first tab 2314 along the stacking direction of the first tab 2314 falls within the projection range of the first tab 2314 with a larger width
  • the embodiment of the present application provides a prismatic battery 100 , the electrode assembly 23 is arranged in the housing 21 , the electrode assembly 23 includes two pole pieces 231 , and the two pole pieces 231 One of the pole pieces 231 is a positive pole piece, and the other is a negative pole piece.
  • Each pole piece 231 includes a connected winding end section 2313 and a winding end section 2313.
  • the winding end section 2313 is provided with a plurality of first tabs 2314.
  • the winding start section 2315 is provided with a plurality of second tabs 2316, a plurality of first tabs 2314 are stacked, a plurality of second tabs 2316 are stacked, the stacking direction of the multiple first tabs 2314 and the stacking direction of the multiple first tabs
  • the stacking direction of the two tabs 2316 is the same, and the width of the first tab 2314 near the winding center among the two adjacent first tabs 2314 is greater than the width of the first tab 2314 away from the winding center, each The width of the second tab 2316 is greater than the width of the innermost first tab 2314 , and the widths of the plurality of second tabs 2316 are equal.
  • the width of the tab of the pole piece 231 begins to decrease, even if the misalignment of the outer circle layer is large, the total misalignment shown by the tab of the pole piece 231 will become smaller, reducing the amount of dislocation caused by misalignment.
  • the short-circuit risk is also beneficial to increase the thickness design of the prismatic battery 100 and improve the energy density.
  • a plurality of first tabs 2314 and a plurality of second tabs 2316 are located on the same side of the thickness central plane P, and the first tab 2314 and the second tab 2316 of each pole piece 231 are located at one end of the axial direction B of the electrode assembly .
  • the tabs of the two pole pieces 231 are located at the same end in the axial direction B of the electrode assembly.
  • the embodiment of the present application also provides a battery cell 20 , and the battery cell 20 includes a casing 21 and the wound electrode assembly 23 provided in any of the above embodiments.
  • the embodiment of the present application also provides a battery 100 , and the battery 100 includes the case 10 and the battery 100 provided in the above embodiments.
  • the battery 100 is accommodated in the case 10 .
  • the embodiment of the present application also provides an electric device, which includes the battery cell 20 provided in the above embodiment.
  • FIG. 14 is a flowchart of a manufacturing method of the wound electrode assembly 23 provided by some embodiments of the present application.
  • the embodiment of the present application also provides a method for manufacturing the wound electrode assembly 23, including:
  • Step S100 providing a pole piece 231, the pole piece 231 includes a winding end section 2313, and the winding end section 2313 is provided with a plurality of first tabs 2314;
  • Step S200 winding the pole piece 231 around the winding center, so that a plurality of first tabs 2314 are stacked;
  • the width of the first tab 2314 close to the winding center of the wound electrode assembly 23 is greater than the width of the first tab 2314 away from the winding center.
  • the pole piece 231 is wound around the winding center so that multiple first tabs 2314 are stacked, and the total misalignment of the multiple first tabs 2314 is small, reducing the The short-circuit risk caused by the large dislocation in the width direction of the first tab 2314 can also improve the safety performance of the battery cell 20 and improve the electricity safety of the electric equipment. Moreover, the total misalignment of multiple first tabs 2314 is small, so the same area can correspond to more first tabs 2314, which is beneficial to increase the size of the electrode assembly in the thickness direction C and improve the stability of the battery cell 20. Energy Density.
  • FIG. 15 is a schematic structural diagram of a manufacturing equipment 2000 for a wound electrode assembly provided in some embodiments of the present application.
  • the embodiment of the present application also provides a wound electrode assembly manufacturing equipment 2000 , including a providing device 2100 and an assembling device 2200 .
  • the providing device 2100 is configured to provide a pole piece 231
  • the pole piece 231 includes a winding end section 2313
  • the winding end section 2313 is provided with a plurality of first tabs 2314 .
  • the assembly device 2200 is configured to wind the pole piece 231 around the winding center so that a plurality of first tabs 2314 are stacked.
  • the width of the first tab 2314 close to the winding center of the wound electrode assembly 23 is greater than the width of the first tab 2314 away from the winding center.
  • the assembly device 2200 winds the pole piece 231 around the winding center, so that the multiple first tabs 2314 are stacked, and the total misalignment of the multiple first tabs 2314 is small, reducing the The risk of short circuit caused by the large dislocation of the first tab 2314 in the width direction of the first tab 2314 can also improve the safety performance of the battery cell 20 and improve the safety of electric equipment. Moreover, the total misalignment of multiple first tabs 2314 is small, so the same area can correspond to more first tabs 2314, which is beneficial to increase the size of the electrode assembly in the thickness direction C and improve the stability of the battery cell 20. Energy Density.

Abstract

本申请提供了一种卷绕式电极组件、电池单体、电池、用电设备、卷绕式电极组件的制造方法及设备，涉及电池技术领域。卷绕式电极组件，包括极片。极片包括卷绕收尾段，卷绕收尾段设有多个第一极耳，多个第一极耳层叠设置，相邻的两个第一极耳中，靠近卷绕式电极组件的卷绕中心的第一极耳的宽度大于远离卷绕中心的第一极耳的宽度。相邻的两个第一极耳靠近卷绕中心的第一极耳的宽度大于远离卷绕中心的第一极耳，即从内至外，多个第一极耳的宽度逐渐减小。则卷绕收尾段卷绕完成后，相邻的两个第一极耳的错位量减小，从而使得多个第一极耳表现的总错位量较小，降低因多个第一极耳在第一极耳的宽度方向的错位量较大造成的短路风险。

Description

卷绕式电极组件、电池单体、电池及用电设备 技术领域
本申请涉及电池技术领域，具体而言，涉及一种卷绕式电极组件、电池单体、电池、用电设备、卷绕式电极组件的制造方法及设备。
背景技术
目前，车辆、便携式电器、手机、航天器等领域广泛使用锂离子蓄电池为其提供电能。
电池技术的发展要同时考虑多方面的设计因素，例如，能量密度、循环寿命、放电容量、充放电倍率等性能参数，另外，还需要考虑电池的安全性，而电池内部短路是影响电池安全性能的重要因素之一。因此，如何降低电池内部短路的风险成为亟待解决的问题。
发明内容
本申请实施例提供一种卷绕式电极组件、电池单体、电池、用电设备、卷绕式电极组件的制造方法及设备，以降低电池内部短路的风险。
第一方面，本申请实施例提供一种卷绕式电极组件，包括：极片，所述极片包括卷绕收尾段，所述卷绕收尾段设有多个第一极耳，多个所述第一极耳层叠设置，相邻的两个所述第一极耳中，靠近所述卷绕式电极组件的卷绕中心的第一极耳的宽度大于远离所述卷绕中心的第一极耳的宽度。
上述技术方案中，多个第一极耳层叠布置，相邻的两个第一极耳靠近卷绕中心的第一极耳的宽度大于远离卷绕中心的第一极耳，换句话说，从内至外，多个第一极耳的宽度逐渐减小，则卷绕收尾段卷绕完成后，沿第一极耳的宽度方向，相邻的两个第一极耳的错位量减小，从而使得多个第一极耳表现的总错位量较小，降低因电极组件的多个第一极耳在第一极耳的宽度方向的错位量较大造成的短路风险，提高电池单体的安全性能。且多个第一极耳表现的总错位量较小，因此相同的连接区域能够对应更多的第一极耳，有利于增大电极组件的厚度方向的尺寸，能够提高电池单体的能量密度。
在本申请第一方面的一些实施例中，所述极片还包括与所述卷绕收尾段相连的卷绕起始段，所述卷绕起始段设有第二极耳，所述第二极耳与多个所述第一极耳层叠布置；所述第二极耳的宽度大于或等于所述多个第一极耳中最靠近所述卷绕中心的所述第一极耳的宽度。
上述技术方案中，在实际卷绕过程中，电极组件的卷绕起始段上的第二极耳在第二极耳的宽度方向上的错位量较小，因此，第二极耳的宽度大于或者等于多个第一极耳的宽度能够在不影响电极组件的极耳的总错位量的情况下，使得电极组件的极耳具有较好的过流能力和较好的散热能力。
在本申请第一方面的一些实施例中，所述第二极耳的数量为多个，多个所述第二极耳层叠设置，多个所述第二极耳的宽度相等。
上述技术方案中，多个第二极耳的宽度相等，既方便制造，还能使极耳具备较好的过流能力和散热能力。
在本申请第一方面的一些实施例中，所述第二极耳的数量小于或等于25个。
上述技术方案中，随着极片的卷绕半径增大，极耳的错位量增大，因此，第二极耳的数量小于或等于25个，能够有效减小第一极耳和第二极耳沿第一极耳的宽度方向产生的总错位量，降低因多个第一极耳在第一极耳的宽度方向的错位量较大造成的短路风险。
在本申请第一方面的一些实施例中，所述第二极耳的数量为多个，多个所述第二极耳层叠设置，相邻的两个所述第二极耳中，靠近所述卷绕中心的第二极耳的宽度大于远离所述卷绕中心的第二极耳的宽度。
上述技术方案中，多个第二极耳沿与多个第一极耳的层叠方向相同的方向层叠布置，相邻的两个第二极耳靠近卷绕中心的第二极耳的宽度大于远离卷绕中心的第二极耳，换句话说，从内至外，多个第二极耳的宽度逐渐减小，使得第二极耳具有较好的过流能力和较好的散热能力。
在本申请第一方面的一些实施例中，所述第一极耳具有连接端和自由端，沿所述极片的宽度方向，所述连接端连接于所述卷绕收尾段的一端；沿所述连接端至所述自由端的方向，多个所述第一极耳中的每一个所述第一极耳的宽度逐渐减小。
上述技术方案中，沿第一极耳的连接端至自由端的方向，每个第一极耳的宽度逐渐减小，避免与其他部件的干涉，此外，在保证第一极耳与其他部件焊接面积的基础上增加第一极耳与卷绕收尾段的连接强度。
在本申请第一方面的一些实施例中，相邻的两个所述第一极耳的宽度差相等。
上述技术方案中，相邻的两个第一极耳的宽度差相等，即沿第一极耳背离卷绕中心的方向，多个第一极耳的宽度呈线性递减，能够减小多个第一极耳沿第一极耳的宽度方向产生的总错位量，降低因多个第一极耳在第一极耳的宽度方向的错位量较大造成的短路风险。
在本申请第一方面的一些实施例中，在多个所述第一极耳的层叠方向上，沿所述多个第一极耳背离所述卷绕中心的方向，相邻的两个所述第一极耳的宽度差逐渐增大。
上述技术方案中，相邻的两个第一极耳的宽度差逐渐增大，能够减小多个第一极耳沿第一极耳的宽度方向产生的总错位量，降低多个第一极耳在第一极耳的宽度方向的错位量较大造成的电极组件的短路风险。
在本申请第一方面的一些实施例中，在多个所述第一极耳的层叠方向上，沿所述多个第一极耳背离所述卷绕中心的方向，相邻的两个所述第一极耳的宽度差为0.5mm-4mm。
上述技术方案中，相邻的两个第一极耳的宽度差为0.5mm-4mm，既能有效降低因多个第一极耳在第一极耳的宽度方向的错位量较大造成的短路风险，还能保证第一极耳的过流能力和散热能力。相邻的两个第一极耳的宽度差小于0.5mm的情况，则相邻两个第一极耳中远离卷绕中心一个第一极耳的宽度相对靠近卷绕中心的一个第一极耳的宽度减小不明显，最终多个第一极耳的总错位量减小不明显，不能有效降低因多个第一极耳在第一极耳的宽度方向的错位量较大造成的短路风险；相邻的两个第一极耳的宽度差大于4mm的情况，则相邻两个第一极耳中远离卷绕中心一个第一极耳的宽度相对靠近卷绕中心的一个第一极耳的宽度减小太大，难以保证第一极耳的过流能力和散热能力。
在本申请的一些实施例中，在多个所述第一极耳的层叠方向上，沿所述多个第一极耳背离所述卷绕中心的方向，多个所述第一极耳的高度逐渐减小。
上述技术方案中，沿多个第一极耳背离卷绕中心的方向，多个第一极耳的高度逐渐减小，即在第一极耳宽度和高度同步减小，降低第一极耳因宽度减小后容易翻折的风险。
在本申请第一方面的一些实施例中，多个所述第一极耳中的每一个所述第一极耳的宽度与高度的比值相同。
上述技术方案中，多个第一极耳中的每一个第一极耳的宽度与高度的比值相同，第一极耳宽度减小后，第一极耳的高度同步减小，降低第一极耳因宽度减小后容易翻折的风险。
在本申请第一方面的一些实施例中，沿所述卷绕式电极组件的卷绕方向，相邻的两个所述第一极耳之间的间距逐渐增大。
上述技术方案中，沿卷绕式电极组件的卷绕方向，相邻的两个第一极耳之间的间距逐渐增大，能够减小相邻的两个第一极耳的错位量，从而降低因多个第一极耳沿第一极耳在第一极耳的宽度方向的错位量较大造成的短路风险。
第二方面，本申请实施例提供一种电池单体，包括壳体和第一方面实施例提供的卷绕式电极组件，所述卷绕式电极组件容纳于壳体内。
上述技术方案中，从内至外，卷绕收尾段的多个第一极耳的宽度逐渐减小，则卷绕收尾段卷绕完成后，沿第一极耳的宽度方向，相邻的两个第一极耳的错位量减小，从而使得多个第一极耳表现的总错位量较小，降低因多个第一极耳在第一极耳的宽度方向的错位量较大造成的短路风险。且多个第一极耳表现的总错位量较小，因此相同的连接区域能够对应更多的第一极耳，有利于增大电极组件的厚度方向的尺寸，提高电池单体的能量密度。
第三方面，本申请实施例提供一种电池，包括箱体和根据第二方面实施例提供的电池单体，所述电池单体容纳于所述箱体内。
上述技术方案中，从内至外，卷绕收尾段的多个第一极耳的宽度逐渐减小，则卷绕收尾段卷绕完成后，沿第一极耳的宽度方向，相邻的两个第一极耳的错位量减小，从而使得多个第一极耳表现的错总位量较小，降低因多个第一极耳在第一极耳宽度方向的错位量较大造成的短路风险，也能提高电池的安全性能。且多个第一极耳表现的总错位量较小，因此相同的连接区域能够对应更多的第一极耳，有利于增大电极组件的厚度方向的尺寸，提高电池的能量密度。
第四方面，本申请的实施例提供一种用电设备，包括第二方面实施例提供的电池单体。
上述技术方案中，多个第一极耳表现的总错位量较小，降低因多个第一极耳在第一极耳的宽度方向的错位量较大造成的短路风险，也能提高电池单体的安全性能，提高用电设备的用电安全。且多个第一极耳表现的总错位量较小，因此相同的区域能够对应更多的第一极耳，有利于增大电极组件的厚度方向的尺寸，提高电池单体的能量密度，以满足用电设备更大和更长时间的电能需求。
第五方面，本申请实施例提供一种卷绕式电极组件的制造方法，包括：
提供极片，所述极片包括卷绕收尾段，所述卷绕收尾段设有多个第一极耳；
将所述极片绕卷绕中心卷绕设置，以使多个所述第一极耳层叠设置；
其中，相邻的两个所述第一极耳中，靠近所述卷绕式电极组件的卷绕中心的第一极耳的宽度大于远离所述卷绕中心的第一极耳的宽度。
上述技术方案中，将极片绕卷绕中心卷绕设置，以使多个所述第一极耳层叠设置，多个第一极耳表现的总错位量较小，降低因多个第一极耳在第一极耳的宽度方向的错位量较大造成的短路风险，也能提高电池单体的安全性能，提高用电设备的用电安全。且多个第一极耳表现的总错位量较小，因此相同的区域能够对应更多的第一极耳，有利于增大电极组件的厚度方向的尺寸，提高电池单体的能量密度。
第六方面，本申请实施例提供一种卷绕式电极组件的制造设备，包括提供装置和组装装置。所述提供装置被配置为提供极片，所述极片包括卷绕收尾段，所述卷绕收尾段设有多个第一极耳。所述组装装置被配置为将所述极片绕卷绕中心卷绕设置，以使多个所述第一极耳层叠设置。其中，相邻的两个所述第一极耳中，靠近所述卷绕式电极组件的卷绕中心的第一极耳的宽度大于远离所述卷绕中心的第一极耳的宽度。
上述技术方案中，组装装置将极片绕卷绕中心卷绕设置，以使多个所述第一极耳层叠设置，多个第一极耳表现的总错位量较小，降低因多个第一极耳在第一极耳的宽度方向的错位量较大造成的短路风险，也能提高电池单体的安全性能，提高用电设备的用电安全。且多个第一极耳表现的总错位量较小，因此相同的区域能够对应更多的第一极耳，有利于增大电极组件的厚度方向的尺寸，提高电池单体的能量密度。
附图说明
为了更清楚地说明本申请实施例的技术方案，下面将对实施例中所需要使用的附图作简单地介绍，应当理解，以下附图仅示出了本申请的某些实施例，因此不应被看作是对范围的限定，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他相关的附图。
图1为本申请一些实施例提供的车辆的结构示意图；
图2为本申请一些实施例提供的电池的结构示意图；
图3为本申请一些实施例提供的多个电池单体通过汇流部件连接的结构示意图；
图4为本申请一些实施例提供的电池单体的爆炸图；
图5为本申请一些实施例提供的卷绕式电极组件的结构示意图；
图6为图5中I处的放大图；
图7为本申请一些实施例提供的极片的展开示意图；
图8为本申请又一些实施例提供的极片的展开示意图；
图9为本申请另一些实施例提供的极片的展开示意图；
图10为本申请又一些实施例提供的电极组件的结构示意图；
图11为图10中II处的放大图；
图12为本申请再一些实施例提供的电极组件的结构示意图；
图13为图12中II处的放大图；
图14为本申请一些实施例提供的卷绕式电极组件的制造方法的流程图；
图15为本申请一些实施例提供的卷绕式电极组件的制造设备的结构简图。
图标：1000-车辆；100-电池；10-箱体；11-容纳空间；12-第一部分；13-第二部分；20-电池单体；21-壳体；211-开口；22-端盖组件；221-端盖；222-第一电极端子；223-第二电极端子；224-集流部件；224a-第一集流部件；224b-第二集流部件；225-泄压机构；23-电极组件；231-极片；2311-正极极耳；2312-负极极耳；2313-卷绕收尾段；2314-第一极耳；23141-连接端；23142-自由端；2315-卷绕起始段；2316-第二极耳；30-汇流部件；200-控制器；300-马达；2000-卷绕式电极组件的制造设备；2100-提供装置；2200-组装装置；A-电极组件的长度方向；B-电极组件的轴向；C-电极组件的厚度方向；D-卷绕方向；E-极片的长度方向；F-极片的宽度方向；P-厚度中心面。
具体实施方式
为使本申请实施例的目的、技术方案和优点更加清楚，下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例是本申请一部分实施例，而不是全部的实施例。通常在此处附图中描述和示出的本申请实施例的组件可以以各种不同的配置来布置和设计。
因此，以下对在附图中提供的本申请的实施例的详细描述并非旨在限制要求保护的本申请的范围，而是仅仅表示本申请的选定实施例。基于本申请中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本申请保护的范围。
需要说明的是，在不冲突的情况下，本申请中的实施例及实施例中的特征可以相互组合。
应注意到：相似的标号和字母在下面的附图中表示类似项，因此，一旦某一项在一个附图中被定义，则在随后的附图中不需要对其进行进一步定义和解释。
在本申请实施例的描述中，需要说明的是，指示方位或位置关系为基于附图所示的方位或位置关系，或者是该申请产品使用时惯常摆放的方位或位置关系，或者是本领域技术人员惯常理解的方位或位置关系，仅是为了便于描述本申请和简化描述，而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本申请的限制。此外，术语“第一”、“第二”、“第三”等仅用于区分描述，而不能理解为指示或暗示相对重要性。
卷绕式电极组件是通过正极片、隔离膜和负极片层叠并卷绕形成。正极片的正极极耳层叠布置，要求各个正极极耳完全重叠或者错位量控制在一定范围内，负极片的负极极耳层叠布置，要 求各个负极极耳完全重叠或者错位量控制在一定范围内。然而由于在卷绕电极组件的过程中，极片的卷绕半径越来越大，导致正极极耳和/或负极极耳表现出的总错位量越大。
然而极耳总错位量大，会导致许多问题的发生，例如极耳总错位量大，导致正负极耳之间的间距减小，短路风险增加，影响电池单体安全性；又例如，极耳总错位量大导致各极耳之间的重叠面积小，使与其他部件(例如电极端子、端盖、集流部件等部件)的焊接面积减小，从而过流面积减小，影响电池单体安全性。
基于此，为改善极耳错位的问题，发明人经过深入研究，设计一种电极组件，通过将极片的卷绕收尾段多个第一极耳层叠布置，并且相邻的两个第一极耳中，靠近卷绕式电极组件的卷绕中心的第一极耳的宽度大于远离卷绕中心的第一极耳的宽度，换句话说，从内至外，多个第一极耳的宽度逐渐减小，相邻的两个第一极耳的错位量减小，从而使得多个第一极耳表现的总错位量较小，进而减小短路风险。且多个第一极耳表现的总错位量较小，因此相同的连接区域能够对应更多的第一极耳，有利于增大电极组件的厚度方向的尺寸，能够提高电池单体的能量密度。
本申请实施例描述的技术方案适用于电池以及使用电池的用电设备。
用电设备可以是车辆、手机、便携式设备、笔记本电脑、轮船、航天器、电动玩具和电动工具等等。车辆可以是燃油汽车、燃气汽车或新能源汽车，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；航天器包括飞机、火箭、航天飞机和宇宙飞船等等；电动玩具包括固定式或移动式的电动玩具，例如，游戏机、电动汽车玩具、电动轮船玩具和电动飞机玩具等等；电动工具包括金属切削电动工具、研磨电动工具、装配电动工具和铁道用电动工具，例如，电钻、电动砂轮机、电动扳手、电动螺丝刀、电锤、冲击电钻、混凝土振动器和电刨等等。本申请实施例对上述用电设备不做特殊限制。
以下实施例为了方便说明，以用电设备为车辆为例进行说明。
请参照图1，图1为本申请一些实施例提供的车辆1000的结构示意图。车辆1000可以为燃油汽车、燃气汽车或新能源汽车，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。
车辆1000的内部设置有电池100，电池100可以设置在车辆1000的底部或头部或尾部。电池100可以用于车辆1000的供电，例如，电池100可以作为车辆1000的操作电源。
车辆1000还可以包括控制器200和马达300，控制器200用来控制电池100为马达300供电，例如，用于车辆1000的启动、导航和行驶时的工作用电需求。
在本申请一些实施例中，电池100不仅仅可以作为车辆1000的操作电源，还可以作为车辆1000的驱动电源，代替或部分地代替燃油或天然气为车辆1000提供驱动动力。
请参照图2，图2为本申请一些实施例提供的电池100的结构示意图。电池100包括箱体10和电池单体20，电池单体20收容于箱体10内。
箱体10用于为电池单体20提供容纳空间11。在一些实施例中，箱体10可以包括第一部分12和第二部分13，第一部分12与第二部分13相互盖合，以限定出用于容纳电池单体20的容纳空间11。当然，第一部分12与第二部分13的连接处可通过密封件(图未示出)来实现密封，密封件可以是密封圈、密封胶等。
第一部分12和第二部分13可以是多种形状，比如，长方体、圆柱体等。第一部分12可以是一侧开放的空心结构，第二部分13也可以是一侧开放的空心结构，第二部分13的开放侧盖合于第一部分12的开放侧，则形成具有容纳空间11的箱体10。当然，也可以是第一部分12为一侧开放的空心结构，第二部分13为板状结构，第二部分13盖合于第一部分12的开放侧，则形成具有容纳空间11的箱体10。
在电池100中，电池单体20可以是一个、也可以是多个。若电池单体20为多个，多个电池单体20之间可串联或并联或混联，混联是指多个电池单体20中既有串联又有并联。多个电池单体20之间可直接串联或并联或混联在一起，再将多个电池单体20构成的整体容纳于箱体10内； 当然，也可以是多个电池单体20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10内。电池单体20可呈圆柱体、扁平体、长方体或其它形状等。图2示例性的示出了电池单体20呈方形的情况。
请参照图3，图3为本申请一些实施例提供的多个电池单体20通过汇流部件30连接的结构示意图。在一些实施例中，电池100还可以包括汇流部件30，多个电池单体20之间可通过汇流部件30实现电连接，以实现多个电池单体20的串联或并联或混联。
请参照图4，图4为本申请一些实施例提供的电池单体20的爆炸图。电池单体20可以包括壳体21、端盖组件22和电极组件23。壳体21具有开口211，电极组件23容纳于壳体21内，端盖组件22用于封盖于开口211。
壳体21可以是多种形状，比如，圆柱体、长方体等。壳体21的形状可根据电极组件23的具体形状来确定。比如，若电极组件23为圆柱体结构，壳体21则可选用为圆柱体结构；若电极组件23为长方体结构，壳体21则可选用长方体结构。图5示例性的示出了壳体21和电极组件23为方形的情况。
壳体21的材质也可以是多种，比如，铜、铁、铝、不锈钢、铝合金等，本申请实施例对此不作特殊限制。
端盖组件22用于封盖壳体21的开口211，以形成一密闭的容纳腔(图中未示出)，容纳腔用于容纳电极组件23。容纳腔还用于容纳电解质，例如电解液。端盖组件22作为输出电极组件23的电能的部件，端盖组件22中的电极端子用于与电极组件23电连接，即电极端子与电极组件23的极耳电连接，在一些实施例中，电极端子与极耳通过集流部件224连接，以实现电极端子与极耳的电连接。
需要说明的，壳体21的开口211可以是一个，也可以是两个。若壳体21的开口211为一个，端盖组件22也可以为一个，端盖组件22中则可设置两个电极端子，两个电极端子分别用于与电极组件23正极极耳2311和负极极耳2312电连接，端盖组件22中的两个电极端子分别为正极电极端子和负极电极端子。若壳体21的开口211为两个，比如，两个开口211设置在壳体21相对的两侧，端盖组件22也可以为两个，两个端盖组件22分别盖合于壳体21的两个开口211处。在这种情况下，可以是一个端盖组件22中的电极端子为正极电极端子，用于与电极组件23的正极极耳2311电连接；另一个端盖组件22中的电极端子为负极电极端子，用于与电极组件23的负极极耳2312电连接。
如图4所示，电池单体20具有一个端盖组件22，端盖221上设有用于与正极极耳2311电连接的第一电极端子222和用于与负极极耳2312电连接的第二电极端子223在。电池单体20还包括第一集流部件224a和第二集流部件224b，正极极耳2311与第一电极端子222通过第一集流部件224a实现电连接，负极极耳2312与第二电极端子223通过第二集流部件224b实现电连接。
端盖组件22还设有泄压机构225，泄压机构225用于在电池单体20的内部的温度或者压力达到阈值时致动以泄放电池单体20内部的压力。泄压机构225可以采用诸如防爆阀、防爆片、气阀、泄压阀或安全阀等的形式，并可以具体采用压敏或温敏的元件或构造，即，当电池单体20的内部压力或温度达到预定阈值时，泄压机构225执行动作或者泄压机构225中设有的薄弱结构被破坏，从而形成可供内部压力或温度泄放的开口或通道。
如图5、图6、图7所示，图5为本申请一些实施例提供的卷绕式电极组件23的结构示意图，图6为图5中I处的放大图，图7为本申请一些实施例提供的极片231展开示意图。在一些实施例中，电极组件23为卷绕式电极组件23，卷绕式电极组件23包括极片231。极片231包括卷绕收尾段2313，卷绕收尾段2313设有多个第一极耳2314，多个第一极耳2314层叠设置，相邻的两个第一极耳2314中，靠近卷绕式电极组件23的卷绕中心的第一极耳2314的宽度大于远离卷绕中心的第一极耳2314的宽度。
卷绕式电极组件23可以包括正极片、负极片和隔离膜。卷绕式电极组件23由正极片、隔离膜和负极片通过卷绕形成的卷绕式结构，隔离膜用于隔离正极片和负极片，降低正极片和负极片接触而短路的风险。
卷绕收尾段2313从卷绕末端沿卷绕方向的反方向延伸的圈数为m，极片231卷绕的总圈数为n，m＜n，m＞2，即卷绕收尾段2313从卷绕末端沿卷绕方向D的反方向延伸的圈数超过两圈，每一圈卷绕收尾段2313可以设置至少一个第一极耳2314。
正极片包括正极集流体和正极活性物质层，正极活性物质层涂覆于正极集流体的表面，未涂敷正极活性物质层的正极集流体凸出于已涂覆正极活性物质层的正极集流体，未涂敷正极活性物质层的正极集流体作为正极极耳2311。以锂离子电池为例，正极集流体的材料可以为铝，正极活性物质可以为钴酸锂、磷酸铁锂、三元锂或锰酸锂等。负极片包括负极集流体和负极活性物质层，负极活性物质层涂覆于负极集流体的表面，未涂敷负极活性物质层的负极集流体凸出于已涂覆负极活性物质层的负极集流体，未涂敷负极活性物质层的负极集流体作为负极极耳2312。负极集流体的材料可以为铜，负极活性物质可以为碳或硅等。为了保证通过大电流而不发生熔断，正极极耳2311的数量为多个且层叠在一起，负极极耳2312的数量为多个且层叠在一起。隔离膜的材质可以为PP(polypropylene，聚丙烯)或PE(polyethylene，聚乙烯)等。
正极片具有正极极耳2311，可以是正极片中未涂覆正极活性物质层的正极集流体作为正极极耳2311，负极片具有负极极耳2312，可以是负极片中未涂覆负极活性物质层的负极集流体作为负极极耳2312。卷绕式电极组件23的正极极耳2311和负极极耳2312可以位于电极组件的轴向B的一端，也可以是分别位于电极组件的轴向B的两端。图5中示出的是正极极耳2311和负极极耳2312位于电极组件的轴向B的同一端的结构示意图。图5中正极片的正极极耳2311和负极片的负极极耳2312沿电极组件的长度方向A间隔布置。
因此，本实施例中所述的“极片231”可以是正极片，也可以是负极片，当“极片231”是正极片时，第一极耳2314为正极极耳，当“极片231”是负极片时，第一极耳2314为负极极耳。
“多个第一极耳2314层叠设置”是指多个第一极耳2314沿一直线方向依次布置，并且相邻的两个第一极耳2314至少部分重叠。在一些实施例中，多个第一极耳2314沿电极组件的厚度方向C层叠布置，多个第一极耳2314位于电极组件23的厚度中心面P的一侧，电极组件23的厚度中心面P是指与电极组件23的卷绕中心轴线共面且垂直电极组件的厚度方向C的平面；在另一些实施例中，多个第一极耳2314可以位于电极组件23的厚度中心面P的两侧。
极片231处于卷绕状态时，“第一极耳2314的宽度”是第一极耳2314沿卷绕方向D的最大尺寸，第一极耳2314的错位是指相邻的两个第一极耳2314沿第一极耳2314的层叠方向的投影部分重合，多个第一极耳2314总错位量是指多个第一极耳2314沿第一极耳2314的层叠方向的投影的最大宽度。“第一极耳2314的宽度”是指，极片231处于展开状态时，第一极耳2314沿极片的长度方向E(图7中示出)的最大尺寸。
多个第一极耳2314层叠布置，相邻的两个第一极耳2314靠近卷绕中心的第一极耳2314的宽度大于远离卷绕中心的第一极耳2314，换句话说，从内至外，多个第一极耳2314的宽度逐渐减小，则卷绕收尾段卷绕2313完成后，沿第一极耳2314的宽度方向，相邻的两个第一极耳2314的错位量减小，从而使得多个第一极耳2314表现的总错位量较小，降低因电极组件23的多个第一极耳2314在第一极耳2314的宽度方向的错位量较大造成的短路风险，提高电池单体20的安全性能。
一般地，电极组件23的极耳会与其他部件(比如集流部件224)通过焊接等方式实现电连接，以将电能引出，但集流部件224用于连接的区域面积有限，电极组件23的极耳超出集流部件224的连接区域的部分将不能与集流部件224连接，容易带来电池单体20内部短路的风险，多个第一极耳2314表现的总错位量较小，因此相同的连接区域能够对应更多的第一极耳2314，有利于增大电极组件的厚度方向C的尺寸，能够提高电池单体20的能量密度。
需要说明的是，“从内至外”是第一极耳2314相对电极组件23的卷绕中心而言，是指沿电极组件23的卷绕中心朝向第一极耳2314的方向。内”是指电极组件23的卷绕中心，“外”是指电极组件23的外侧。
请继续参照图7，在一些实施例中，极片231还包括与卷绕收尾段2313相连的卷绕起始 段2315，卷绕起始段2315设有第二极耳2316，第二极耳2316与多个第一极耳2314层叠布置；第二极耳2316的宽度大于或等于多个第一极耳2314中最靠近卷绕中心的第一极耳2314的宽度。
在卷绕过程中，卷绕起始段2315先于卷绕收尾段2313完成卷绕，第二极耳2316设于卷绕起始段2315，则第二极耳2316相对多个第一极耳2314更靠近电极组件23的卷绕中心。
卷绕起始段2315从极片231的卷绕起始端沿卷绕方向D延伸至少一圈，每一圈卷绕起始段2315可以设置至少一个第二极耳2316。
第二极耳2316的数量可以是一个或多个。在第二极耳2316的数量为多个的实施例中，“第二极耳2316与多个第一极耳2314层叠布置”是指，多个第二极耳2316层叠布置，且多个第二极耳2316层叠布置的方向与多个第一极耳2314层叠布置的方向相同。
第一极耳2314和第二极耳2316同属于同一个极片231，则第二极耳2316和第一极耳2314的极性相同，在第一极耳2314为正极极耳2311的实施例中，第二极耳2316为正极极耳2311，在第一极耳2314为负极极耳2312的实施例中，第二极耳2316为负极极耳2312。
在一些实施例中，每个第二极耳2316的宽度大于多个第一极耳2314最内侧的第一极耳2314的宽度。在另一些实施例中，每个第二极耳2316的宽度等于多个第二极耳2316最内侧的第一极耳2314的宽度相等。
在实际卷绕过程中，电极组件23的卷绕起始段2315上的第二极耳2316在第二极耳2316的宽度方向上的错位量较小，因此，第二极耳2316的宽度大于或者等于多个第一极耳2314的宽度能够在不影响极片231的总错位量的情况下，使得电极组件23的极耳具有较好的过流能力和较好的散热能力。
在一些实施例中，第二极耳2316的数量为多个，多个第二极耳2316层叠设置，多个第二极耳2316的宽度相等。
多个第二极耳2316的宽度相等，既方便制造，还能在匹配集流部件224的连接区域的情况下使极耳的具备较好的过流能力和散热能力。
在一些实施例中，第二极耳2316的数量小于或等于25个。
第二极耳2316的数量小于等于25个仅仅包含与多个第一极耳2314同侧且与多个第一极耳2314沿相同方层叠的第二极耳2316。
随着极片231的卷绕半径增大，极耳的错位量增大，在第二极耳2316的数量小于等于25个的情况下，能够有效减小电极组件23的第一极耳2314沿第一极耳2314的宽度方向产生的总错位量，降低因多个第一极耳2314在第一极耳2314宽度方向的错位量较大造成的短路风险。
在一些实施例中，第二极耳2316的数量为多个，第二极耳2316层叠设置，相邻的两个第二极耳2316中，靠近卷绕中心的第二极耳2316的宽度大于远离卷绕中心的第二极耳2316的宽度。
多个第二极耳2316沿与多个第一极耳2314的层叠方向相同的方向层叠布置，相邻的两个第二极耳2316靠近卷绕中心的第二极耳2316的宽度大于远离卷绕中心的第二极耳2316，换句话说，从内至外，多个第二极耳2316的宽度逐渐减小，使得第二极耳2316具有较好的过流能力和较好的散热能力。
请继续参见图7，在一些实施例中，第一极耳2314具有连接端23141和自由端23142，沿极片的宽度方向F，连接端23141连接于卷绕收尾段2313的一端；沿连接端23141至自由端23142的方向，多个第一极耳2314中的每一个第一极耳2314的宽度逐渐减小。
在极片231卷绕形成电极组件23的状态下，极片的宽度方向F与电极组件23的轴向B一致，在极片231处于展开状态，极片的宽度方向F垂直于极片的长度方向E。
第一极耳2314的自由端23142是指与连接端23141相对且未与卷绕收尾段2313连接的一端。沿连接端23141至自由端23142的方向，多个第一极耳2314中的每一个第一极耳2314的宽度 逐渐减小结构有很多，比如，第一极耳2314为等腰梯形、直角梯形等。
沿第一极耳2314的连接端23141至自由端23142的方向，每个第一极耳2314的宽度逐渐减小，避免与其他部件的干涉，此外，在保证第一极耳2314与其他部件焊接面积的基础上增加第一极耳2314与卷绕收尾段2313的连接强度。
在另一些实施例中，沿第一极耳2314的连接段至自由端23142的方向，每个第一极耳2314的宽度相等。
请继续参见图7，在一些实施例中，相邻的两个第一极耳2314的宽度差相等。
“相邻的两个第一极耳2314的宽度差相等”是指，以一个第一极耳2314为参考，该第一极耳2314与其内侧的第一极耳2314的宽度差等于该第一极耳2314与其外侧的第一极耳2314的宽度差。
沿第一极耳2314背离卷绕中心的方向，多个第一极耳2314的宽度呈线性递减，能够减小多个第一极耳2314沿第一极耳2314的宽度方向产生的总错位量，降低因多个第一极耳2314在第一极耳2314的宽度方向的错位量较大造成的短路风险。
请参见图8，图8为本申请又一些实施例提供的极片231展开示意图。在一些实施例中，在多个第一极耳2314的层叠方向上，沿多个第一极耳2314背离卷绕中心的方向，相邻的两个第一极耳2314的宽度差逐渐增大。
“相邻的两个第一极耳2314的宽度差逐渐增大”是指，以一个第一极耳2314为参考，该第一极耳2314与其内侧的第一极耳2314的宽度差小于该第一极耳2314与其外侧的第一极耳2314的宽度差。在一些实施例中，沿第一极耳2314背离卷绕中心的方向，多个第一极耳2314的宽度二次关系增加，以使相邻的两个第一极耳2314的宽度差逐渐增大，能够减小多个第一极耳2314沿第一极耳2314的宽度方向产生的总错位量，降低因多个第一极耳2314在第一极耳2314的宽度方向的错位量较大造成的短路风险。
在一些实施例中，在多个第一极耳2314的层叠方向上，沿多个第一极耳2314背离卷绕中心的方向，相邻的两个第一极耳2314的宽度差为0.5mm-4mm。相邻的两个第一极耳2314的宽度差为0.5mm-4mm，既能有效降低因多个第一极耳2314沿第一极耳2314的宽度方向上的错位量较大造成的短路风险，还能保证第一极耳2314的过流能力和散热能力。相邻的两个第一极耳2314的宽度差小于0.5mm的情况，则相邻两个第一极耳2314中远离卷绕中心一个第一极耳2314的宽度相对靠近卷绕中心的一个第一极耳2314的宽度减小不明显，最终多个第一极耳2314的总错位量减小不明显，不能有效降低因多个第一极耳2314在第一极耳2314的宽度方向的错位量较大造成的短路风险；相邻的两个第一极耳2314的宽度差大于4mm的情况，则相邻两个第一极耳2314中远离卷绕中心一个第一极耳2314的宽度相对靠近卷绕中心的一个第一极耳2314的宽度减小太大，难以保证第一极耳2314的过流能力和散热能力。
请继续参见图8，在一些实施例中，在多个第一极耳2314的层叠方向上，沿多个第一极耳2314背离卷绕中心的方向，多个第一极耳2314的高度逐渐减小。
“第一极耳2314的高度”是指，第一极耳2314的自由端23142和第一极耳2314的连接端23141之间的最大尺寸。沿卷绕方向D，第一极耳2314的高度可以相同也可以不相等。
沿多个第一极耳2314背离卷绕中心的方向，多个第一极耳2314的高度逐渐减小，即在第一极耳2314宽度和高度同步减小，降低第一极耳2314因宽度减小后容易翻折的风险。
在一些实施例中，多个第一极耳2314中的每一个第一极耳2314的宽度与高度的比值相同。
多个第一极耳2314中的每一个第一极耳2314的宽度与高度的比值相同，换句话说，第一极耳2314宽度减小后，第一极耳2314的高度同步减小，降低第一极耳2314因宽度减小后容易翻折的风险。
当然，在一些实施例中，多个第一极耳2314的高度可以相同。在另一些实施例中，多个 第一极耳2314中的每个第一极耳2314的宽度与高度的比值可以不相同。
请继续参见图8，在一些实施例中，沿卷绕式电极组件23的卷绕方向D，相邻的两个第一极耳2314之间的间距逐渐增大。
“沿卷绕式电极组件23的卷绕方向D，相邻的两个第一极耳2314之间的距离”是指，沿卷绕式电极组件23的卷绕方向D，第一极耳2314的中心位置和与其相邻的第一极耳2314的中心位置之间的距离。换句话说，在极片231处于展开状态时，“相邻的两个第一极耳2314之间的距离”是指沿极片的长度方向E相邻的两个第一极耳2314的中心位置和与其相邻的第一极耳2314的中心位置之间的距离。当然，在其他实施例中，“沿卷绕式电极组件23的卷绕方向D，相邻的两个第一极耳2314之间的距离”可以采用其他参考定义，但是在定义任意相邻的两个第一极耳2314沿卷绕方向D的距离时应该采用同等的参考。如图8所示，图中Q1、Q2和Q3分别为三个第一极耳2314的在极片的长度方向E的中间位置，Q1和Q2之间的距离为L1，Q2和Q3之间的距离为L2，“相邻的两个第一极耳2314之间的间距逐渐增大”是指，L2大于L1。
需要说明的是，当极片231卷绕后，卷绕方向D与极片的长度方向E一致。
由于在卷绕过程中，卷绕的圈数越多，极耳表现出的总错位量越大，尤其是外部圈层的极耳的总错位量越大，因此，沿卷绕式电极组件23的卷绕方向D，相邻的两个第一极耳2314之间的间距逐渐增大，能够减小相邻的两个第一极耳2314的错位量，从而降低因多个第一极耳2314在第一极耳2314的宽度方向的错位量较大造成的短路风险。
请参见图9，图9为本申请另一些实施例提供的极片231的展开示意图。在一些实施例中，每个第一极耳2314的高度相同。
在一些实施例中，卷绕后，宽度较小的第一极耳2314的沿第一极耳2314的层叠方向的投影落入宽度较大的第一极耳2314的沿第一极耳2314的层叠方向上的投影范围内，且沿第一极耳2314的宽度方向，宽度较大的第一极耳2314的两端均超出宽度较小的第一极耳2314的两端，并且宽度较大的第一极耳2314的两端均超出宽度较小的第一极耳2314的两端的值相等。
请参见图10，图10为本申请又一些实施例提供的电极组件23的结构示意图，图11为图10中II处的放大图。在一些实施例中，卷绕后，宽度较小的第一极耳2314的沿第一极耳2314的层叠方向的投影落入宽度较大的第一极耳2314的沿第一极耳2314的层叠方向上的投影范围内，沿第一极耳2314的宽度方向，宽度较大的第一极耳2314的两端均超出宽度较小的第一极耳2314的两端的值不相等。在另一些实施例中，沿第一极耳2314的宽度方向，宽度较小的第一极耳2314的沿第一极耳2314的层叠方向的投影落入宽度较大的第一极耳2314的沿第一极耳2314的层叠方向上的投影范围内，宽度较大的第一极耳2314的一端均超出宽度较小的第一极耳2314的一端，宽度较大的第一极耳2314的另一端与宽度较小的第一极耳2314的另一端平齐。
请参见图12，图12为本申请再一些实施例提供的电极组件23的结构示意图，图13为图12中II处的放大图，卷绕后，极片231的极耳部分重合，即宽度较小的第一极耳2314的沿第一极耳2314的层叠方向的投影部分落入宽度较大的第一极耳2314的沿第一极耳2314的层叠方向上的投影范围内，沿第一极耳2314的宽度方向，宽度较大的第一极耳2314的一端超出宽度较小的第一极耳2314的一端，宽度较小的第一极耳2314的另一端超出宽度较大的第一极耳2314的另一端。
在一些实施例中，请参见图4、图5，本申请实施例提供一种方形电池100，电极组件23设于壳体21内，电极组件23包括两个极片231，两个极片231中一个极片231为正极片，另一个为负极片，每个极片231包括相连的卷绕收尾段2313和卷绕收尾段2313，卷绕收尾段2313设有多个第一极耳2314，卷绕起始段2315设有多个第二极耳2316，多个第一极耳2314层叠布置，多个第二极耳2316层叠布置，多个第一极耳2314的层叠方向和多个第二极耳2316的层叠方向相同，相邻的两个第一极耳2314中靠近卷绕中心的一个第一极耳2314的宽度大于远离卷绕中心的一个第一极耳2314的宽度，每个第二极耳2316的宽度大于最内侧的第一极耳2314的宽度，多个第二极耳2316的宽度相等。相当于从某一圈开始，该极片231的极耳宽度开始减小，即使外部圈层的错位量大，但极片231的极耳表现出的总错位量会变小，减小错位造成的短路风险，还有利于方 壳电池100增大厚度设计，提高能量密度。
多个第一极耳2314和多个第二极耳2316位于厚度中心面P的同侧，每个极片231的第一极耳2314和第二极耳2316位于电极组件的轴向B的一端。两个极片231的极耳位于电极组件的轴向B的同一端。
本申请实施例还提供一种电池单体20，电池单体20包括壳体21和上述任意实施例提供的卷绕式电极组件23。
本申请实施例还提供一种电池100，电池100包括箱体10和上述实施例提供的电池100。电池100容纳于箱体10内。
本申请实施例还提供一种用电设备，用电设备包括上述实施例提供的电池单体20。
请参照图14，图14为本申请一些实施例提供的卷绕式电极组件23的制造方法的流程图。本申请实施例还提供一种卷绕式电极组件23的制造方法，包括：
步骤S100，提供极片231，极片231包括卷绕收尾段2313，卷绕收尾段2313设有多个第一极耳2314；
步骤S200，将极片231绕卷绕中心卷绕设置，以使多个第一极耳2314层叠设置；
其中，相邻的两个第一极耳2314中，靠近卷绕式电极组件23的卷绕中心的第一极耳2314的宽度大于远离卷绕中心的第一极耳2314的宽度。
将极片231绕卷绕中心卷绕设置，以使多个所述第一极耳2314层叠设置，多个第一极耳2314表现的总错位量较小，降低因多个第一极耳2314在第一极耳2314的宽度方向的错位量较大造成的短路风险，也能提高电池单体20的安全性能，提高用电设备的用电安全。且多个第一极耳2314表现的总错位量较小，因此相同的区域能够对应更多的第一极耳2314，有利于增大电极组件的厚度方向C的尺寸，提高电池单体20的能量密度。
请参照图15，图15为本申请一些实施例提供的卷绕式电极组件的制造设备2000的结构简图。本申请实施例还提供一种卷绕式电极组件的制造设备2000，包括提供装置2100和组装装置2200。提供装置2100被配置为提供极片231，极片231包括卷绕收尾段2313，卷绕收尾段2313设有多个第一极耳2314。组装装置2200被配置为将极片231绕卷绕中心卷绕设置，以使多个第一极耳2314层叠设置。其中，相邻的两个第一极耳2314中，靠近卷绕式电极组件23的卷绕中心的第一极耳2314的宽度大于远离卷绕中心的第一极耳2314的宽度。
组装装置2200将极片231绕卷绕中心卷绕设置，以使多个所述第一极耳2314层叠设置，多个第一极耳2314总错位量较小，降低因多个第一极耳2314在第一极耳2314的宽度方向的错位量较大造成的短路风险，也能提高电池单体20的安全性能，提高用电设备的用电安全。且多个第一极耳2314表现的总错位量较小，因此相同的区域能够对应更多的第一极耳2314，有利于增大电极组件的厚度方向C的尺寸，提高电池单体20的能量密度。
以上仅为本申请的优选实施例而已，并不用于限制本申请，对于本领域的技术人员来说，本申请可以有各种更改和变化。凡在本申请的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本申请的保护范围之内。

Claims (17)

  1. 一种卷绕式电极组件，其中，包括；
    极片，包括卷绕收尾段，所述卷绕收尾段设有多个第一极耳，多个所述第一极耳层叠设置，相邻的两个所述第一极耳中，靠近所述卷绕式电极组件的卷绕中心的第一极耳的宽度大于远离所述卷绕中心的第一极耳的宽度。
  2. 根据权利要求1所述的卷绕式电极组件，其中，所述极片还包括与所述卷绕收尾段相连的卷绕起始段，所述卷绕起始段设有第二极耳，所述第二极耳与多个所述第一极耳层叠布置；
    所述第二极耳的宽度大于或等于所述多个第一极耳中最靠近所述卷绕中心的所述第一极耳的宽度。
  3. 根据权利要求2所述的卷绕式电极组件，其中，所述第二极耳的数量为多个，多个所述第二极耳层叠设置，多个所述第二极耳的宽度相等。
  4. 根据权利要求3所述卷绕式电极组件，其中，所述第二极耳的数量小于或等于25个。
  5. 根据权利要求2所述的卷绕式电极组件，其中，所述第二极耳的数量为多个，相邻的两个所述第二极耳中，靠近所述卷绕中心的第二极耳的宽度大于远离所述卷绕中心的第二极耳的宽度。
  6. 根据权利要求1-5任一项所述的卷绕式电极组件，其中，所述第一极耳具有连接端和自由端，沿所述极片的宽度方向，所述连接端连接于所述卷绕收尾段的一端；
    沿所述连接端至所述自由端的方向，多个所述第一极耳中的每一个所述第一极耳的宽度逐渐减小。
  7. 根据权利要求1-6任一项所述的卷绕式电极组件，其中，相邻的两个所述第一极耳的宽度差相等。
  8. 根据权利要求1-6任一项所述的卷绕式电极组件，其中，在多个所述第一极耳的层叠方向上，沿所述多个第一极耳背离所述卷绕中心的方向，相邻的两个所述第一极耳的宽度差逐渐增大。
  9. 根据权利要求1-8任一项所述的卷绕式电极组件，其中，在多个所述第一极耳的层叠方向上，沿所述多个第一极耳背离所述卷绕中心的方向，相邻的两个所述第一极耳的宽度差为0.5mm-4mm。
  10. 根据权利要求1-9任一项所述的卷绕式电极组件，其中，在多个所述第一极耳的层叠方向上，沿所述多个第一极耳背离所述卷绕中心的方向，多个所述第一极耳的高度逐渐减小。
  11. 根据权利要求10所述的卷绕式电极组件，其中，多个所述第一极耳中的每一个所述第一极耳的宽度与高度的比值相同。
  12. 根据权利要求1-11任一项所述的卷绕式电极组件，其中，沿所述卷绕式电极组件的卷绕方向，相邻的两个所述第一极耳之间的间距逐渐增大。
  13. 一种电池单体，其中，包括：
    壳体；以及
    根据权利要求12所述的卷绕式电极组件，所述卷绕式电极组件容纳于所述壳体内。
  14. 一种电池，其中，包括：
    箱体；以及
    根据权利要求13所述的电池单体，所述电池单体容纳于所述箱体内。
  15. 一种用电设备，其中，包括根据权利要求13所述的电池单体。
  16. 一种卷绕式电极组件的制造方法，其中，包括：
    提供极片，所述极片包括卷绕收尾段，所述卷绕收尾段设有多个第一极耳；
    将所述极片卷绕设置，以使多个所述第一极耳层叠设置；
    其中，相邻的两个所述第一极耳中，靠近所述卷绕式电极组件的卷绕中心的第一极耳的宽度大于远离所述卷绕中心的第一极耳的宽度。
  17. 一种卷绕式电极组件的制造设备，其中，包括：
    提供装置，被配置为提供极片，所述极片包括卷绕收尾段，所述卷绕收尾段设有多个第一极耳；
    组装装置，被配置为将所述极片绕卷绕中心卷绕设置，以使多个所述第一极耳层叠设置；
    其中，相邻的两个所述第一极耳中，靠近所述卷绕式电极组件的卷绕中心的第一极耳的宽度大于远离所述卷绕中心的第一极耳的宽度。
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