WO2024031353A1 - Feuille d'électrodes, ensemble électrodes, cellule de batterie, batterie et dispositif électrique - Google Patents

Feuille d'électrodes, ensemble électrodes, cellule de batterie, batterie et dispositif électrique Download PDF

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Publication number
WO2024031353A1
WO2024031353A1 PCT/CN2022/111219 CN2022111219W WO2024031353A1 WO 2024031353 A1 WO2024031353 A1 WO 2024031353A1 CN 2022111219 W CN2022111219 W CN 2022111219W WO 2024031353 A1 WO2024031353 A1 WO 2024031353A1
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WO
WIPO (PCT)
Prior art keywords
layer
current collecting
active layer
edge
along
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PCT/CN2022/111219
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English (en)
Chinese (zh)
Inventor
阎晓洁
刘智
Original Assignee
宁德时代新能源科技股份有限公司
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Priority to PCT/CN2022/111219 priority Critical patent/WO2024031353A1/fr
Publication of WO2024031353A1 publication Critical patent/WO2024031353A1/fr

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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
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/64—Carriers or collectors
    • H01M4/70—Carriers or collectors characterised by shape or form
    • 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
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/64—Carriers or collectors
    • H01M4/66—Selection of materials

Definitions

  • the present application relates to the field of battery technology, specifically, to a pole piece, an electrode assembly, a battery cell, a battery and electrical equipment.
  • secondary batteries such as lithium-ion batteries, sodium-ion batteries, solid-state batteries, etc.
  • advantages such as high energy density and good cycle performance, and are widely used in portable electronic devices, electric vehicles, electric tools, drones, Energy storage equipment and other fields.
  • the performance requirements for batteries are also constantly increasing, especially the rate performance of batteries. Therefore, how to increase the battery rate has become an urgent problem to be solved in the field of battery technology.
  • Embodiments of the present application provide a pole piece, an electrode assembly, a battery cell, a battery and electrical equipment to increase the charging rate of the battery.
  • embodiments of the present application provide a pole piece, including a positive active layer, a first current collecting layer, an insulating layer, a second current collecting layer and a negative active layer that are stacked along a first direction.
  • the insulating layer is provided Between the first current collecting layer and the second current collecting layer, the positive active layer is disposed on a surface of the first current collecting layer facing away from the insulating layer, and the negative active layer is disposed on the The second current collecting layer is away from the surface of the insulating layer.
  • the pole piece includes a positive electrode active layer, a first current collecting layer, an insulating layer, a second current collecting layer and a negative electrode active layer arranged sequentially along a first direction, and a plurality of the pole pieces are stacked along the first direction.
  • the first current collector of each pole piece is conductively connected
  • the second current collector of each pole piece is conductively connected, thereby forming an internal parallel electrode assembly, which is beneficial to reducing the internal resistance of the battery equipped with the electrode assembly.
  • increasing the current during the battery charging process to increase the charging rate of the battery cells and the battery.
  • the pole piece further includes a positive electrode tab and a negative electrode tab, the positive electrode tab is connected to the first current collecting layer, and the negative electrode tab is connected to the second current collecting layer. layer.
  • the arrangement of the positive electrode tab and the negative electrode tab facilitates the internal parallel connection of the electrode assembly.
  • the positive electrode tab and the negative electrode tab are located on the same side of the pole piece, and the second direction is perpendicular to the first direction.
  • the positive electrode tab and the negative electrode tab are arranged on the same side of the pole piece, which facilitates the internal parallel connection of the electrode assembly formed by using the pole piece.
  • projections of the positive electrode tab and the negative electrode tab on a plane perpendicular to the first direction do not overlap.
  • the projections of the positive electrode lug and the negative electrode lug on the plane perpendicular to the first direction do not overlap, which not only facilitates the conductive connection of the positive electrode lug of each electrode piece and the conductive connection of the negative electrode lug of each electrode piece, but also makes the positive electrode lug and the negative electrode There is no contact between the ears, which reduces the risk of short circuit between the battery cells and the battery including the pole piece.
  • the positive electrode tab and the negative electrode tab are located on opposite sides of the pole piece along the second direction, and the second direction is perpendicular to the first direction.
  • the positive electrode tab and the negative electrode tab are respectively located on opposite sides of the pole piece.
  • the positive electrode tab of each pole piece is located on the same side of the pole piece along the second direction, and the negative electrode tab of each pole piece is located on the pole.
  • the other side of the piece along the second direction facilitates the conductive connection between the positive electrode lugs and the conductive connection between the negative electrode lugs, and the positive electrode lugs and the negative electrode lugs do not interfere with each other, reducing the battery cell including the electrode piece and Risk of battery short circuit.
  • the insulating layer has an opposite first surface and a second surface, and the first current collecting layer and the second current collecting layer respectively Connected to the first surface and the second surface.
  • the first current collecting layer and the second current collecting layer are directly connected to the first surface and the second surface respectively, which can make the size of the pole piece along the first direction small enough, which is conducive to having the pole piece made of The electrode assembly of the battery cell and the energy density of the battery.
  • the insulating layer has an opposite first surface and a second surface, and the first current collecting layer is connected to the first surface through a first adhesive layer.
  • the first surface, the second current collecting layer is connected to the first surface through a second adhesive layer.
  • the first current collecting layer is connected to the first surface through the first adhesive layer
  • the second current collecting layer is connected to the first surface through the second adhesive layer.
  • the connection method is simple and convenient, and can improve the first surface.
  • the connection between the current collecting layer, the insulating layer and the second current collecting layer is stable.
  • the edge of the first current collecting layer exceeds the edge of the cathode active layer; or, the edge of the first current collecting layer is flush with the edge of the cathode active layer. together.
  • the edge of the first current collector layer exceeds the edge of the positive electrode active layer, when the positive electrode active layer is disposed on the first current collector layer, the process requirements are lower, which can reduce the difficulty of manufacturing the pole piece and improve the manufacturing efficiency. ; If the edge of the first current collecting layer is flush with the edge of the positive active layer, waste of material of the first current collecting layer can be avoided.
  • the edge of the second current collecting layer exceeds the edge of the negative active layer; or, the edge of the second current collecting layer is flush with the edge of the negative active layer. together.
  • the edge of the second current collecting layer exceeds the edge of the negative electrode active layer, when the negative electrode active layer is disposed on the second current collecting layer, the process requirements are lower, which can reduce the difficulty of manufacturing the pole piece and improve the manufacturing efficiency. ; If the edge of the second current collecting layer is flush with the edge of the negative active layer, waste of material of the second current collecting layer can be avoided.
  • the edge of the negative active layer exceeds the edge of the positive active layer; or, the edge of the negative active layer is flush with the edge of the positive active layer.
  • the edge of the negative active layer exceeds the edge of the positive active layer; or, the edge of the negative active layer is flush with the edge of the positive active layer, which can reduce the risk of lithium deposition in battery cells and batteries equipped with the pole piece.
  • an embodiment of the present application provides an electrode assembly, including a plurality of pole pieces as provided in any embodiment of the first aspect, and a plurality of the pole pieces are stacked along the first direction.
  • the electrode assembly includes a plurality of pole pieces provided by any embodiment of the first aspect that are stacked along the first direction, which can enable the internal parallel connection of the electrode assembly, which is beneficial to reducing the number of battery cells equipped with the electrode assembly and
  • the internal resistance of the battery increases the current of the battery cell and battery to increase the charging rate of the battery cell and battery.
  • the lengths of the positive active layers of the plurality of pole pieces gradually decrease along the first direction.
  • the length of the positive active layer of the multiple pole pieces gradually decreases along the first direction, so that the length of the positive active layer can adapt to the special-shaped internal space of the housing, so that the special-shaped internal space of the housing can be filled. Utilization is beneficial to improving the energy density of battery cells and batteries equipped with the electrode assembly.
  • the lengths of the negative active layers of the plurality of pole pieces gradually decrease along the first direction.
  • the length of the negative active layer of the pole piece gradually decreases along the first direction, then the changing trend of the length of the negative active layer of the pole piece along the first direction is the same as the changing trend of the length of the positive active layer along the first direction.
  • the changing trend of the length of the negative active layer of each pole piece can adapt to the changing trend of the length of the positive active layer, so that the length of the negative active layer of the pole piece can also adapt to the special-shaped shell in the internal space, so that the special-shaped shell of the shell can
  • the internal space can be fully utilized, which is beneficial to improving the energy density of battery cells and batteries equipped with the electrode assembly.
  • the lengths of the positive active layers of two adjacent pole pieces are the same; the lengths of the negative active layers of the two adjacent pole pieces are the same.
  • the length of the positive active layer of two adjacent pole pieces is the same; the length of the negative active layer of the two adjacent pole pieces is the same, so that the electrode assembly can adapt to the casing with regular internal space.
  • embodiments of the present application provide a battery cell, including an electrode assembly as provided in any embodiment of the second aspect.
  • the electrode assembly provided by any embodiment of the second aspect can realize internal parallel connection. Therefore, the internal resistance of the battery cell including the electrode assembly provided by any embodiment of the second aspect is smaller, thereby increasing the battery cell size. body current to increase the charging rate of the battery cell.
  • an embodiment of the present application provides a battery, including a box and a battery cell as provided in the embodiment of the third aspect; the battery cell is accommodated in the box.
  • the internal resistance of the battery cell is small, thereby increasing the current of the battery to increase the charging rate of the battery.
  • an embodiment of the present application provides an electrical device, including the battery provided in an embodiment of the fourth aspect.
  • Figure 1 is a schematic structural diagram of an existing battery cell
  • Figure 2 is a schematic structural diagram of a vehicle provided by some embodiments of the present application.
  • FIG. 3 is a schematic structural diagram of a battery provided by some embodiments of the present application.
  • Figure 4 is a schematic structural diagram of a battery cell provided by some embodiments of the present application.
  • Figure 5 is an exploded view of a battery cell provided by some embodiments of the present application.
  • Figure 6 is a schematic structural diagram of an electrode assembly provided by some embodiments of the present application.
  • Figure 7 is a schematic structural diagram of a pole piece provided by some embodiments of the present application.
  • Figure 8 is a schematic structural diagram of a pole piece provided in another embodiment of the present application.
  • Figure 9 is a schematic diagram of the pole piece provided in Figure 8 from another perspective
  • Figure 10 is a schematic structural diagram of a pole piece provided in another embodiment of the present application.
  • Figure 11 is a schematic diagram of the pole piece provided in Figure 10 from another perspective
  • Figure 12 is a schematic structural diagram of a pole piece provided by other embodiments of the present application.
  • Figure 13 is a schematic structural diagram of a pole piece provided by some embodiments of the present application.
  • Figure 14 is a schematic structural diagram of an electrode assembly provided by some embodiments of the present application.
  • Figure 15 is a schematic structural diagram of a battery cell provided by some embodiments of the present application.
  • Figure 16 is a schematic structural diagram of an electrode assembly provided by some embodiments of the present application.
  • Figure 17 is a schematic structural diagram of a battery cell provided in some embodiments of the present application.
  • Figure 18 is a schematic structural diagram of an electrode assembly provided by other embodiments of the present application.
  • Icon 1000-vehicle; 100-battery; 10-box; 11-first part; 12-second part; 20', 20-battery cell; 21', 21-casing; 211-opening; 212-section One wall; 213-second wall; 214-third wall; 215-fourth wall; 22', 22-electrode assembly; 221', 221-isolation film; 222', 222-pole piece; 2221', 2221- Positive active layer; 2222'-current collector; 2222-first current collector; 2223-insulation layer; 22231-first surface; 22232-second surface; 2224-second current collector; 2225', 2225-negative electrode activity layer; 2226-positive electrode ear; 2227-negative electrode ear; 2228-first adhesive layer; 2229-second adhesive layer; 23-end cap; 24-electrode terminal; 24a-positive electrode terminal; 24b-negative electrode terminal; 25-pressure relief mechanism; 200-controller; 300-motor; X-first direction; Y-
  • the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of this application is commonly placed when used, or the orientation or positional relationship of this application.
  • the orientation or positional relationship commonly understood by those skilled in the art is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.
  • the terms “first”, “second”, “third”, etc. are only used to distinguish descriptions and shall not be understood as indicating or implying relative importance.
  • Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but are also widely used in electric vehicles such as electric bicycles, electric motorcycles and electric cars, as well as in many fields such as military equipment and aerospace. . As the application fields of power batteries continue to expand, their market demand is also constantly expanding.
  • the battery mentioned in the embodiments of this application refers to a single physical module including one or more battery cells to provide higher voltage and capacity.
  • the battery mentioned in this application may include a battery module or a battery pack.
  • Batteries generally include a box for packaging one or more battery cells.
  • the battery cells may include lithium ion secondary batteries, lithium ion primary batteries, lithium-sulfur batteries, sodium lithium ion batteries, sodium ion batteries or magnesium ion batteries, etc., which are not limited in the embodiments of this application.
  • the battery cell may be in the shape of a cylinder, a flat body, a rectangular parallelepiped or other shapes, and the embodiments of the present application are not limited to this.
  • Battery cells are generally divided into three types according to packaging methods: cylindrical battery cells, rectangular battery cells and soft-pack battery cells, and the embodiments of the present application are not limited to this.
  • the battery cell 20' includes a casing 21', an electrode assembly 22' and an electrolyte.
  • the electrolyte and the electrode assembly 22' are both accommodated in the casing 21'.
  • the electrode assembly 22' includes a plurality of pole pieces 222' stacked along the first direction X and an isolation film 221'. Two adjacent pole pieces 222' are insulated and separated by an isolation film 221'.
  • the pole piece 222' includes a current collector 2222', a positive active layer 2221' and a negative active layer 2225'.
  • the positive active layer 2221' and the negative active layer 2225' are respectively disposed on both sides of the current collector 2222' along the first direction X.
  • the negative active layer 2225' of one of the two adjacent pole pieces 222' faces and covers the positive active layer 2221' of the other.
  • the battery cell 20' mainly relies on the movement of metal ions between the oppositely arranged positive electrode active layer 2221' and the negative electrode active layer 2225' of the two adjacent pole pieces 222'.
  • This electrode assembly formed by the pole pieces 222' 22' can only be connected in series inside, so that the battery and battery cells including the electrode assembly 22' have a smaller current during charging, resulting in a lower charging rate.
  • the pole piece includes a positive active layer, a first current collecting layer, and an insulating layer stacked along a first direction. , the second current collecting layer and the negative electrode active layer, the insulating layer is arranged between the first current collecting layer and the second current collecting layer, the positive electrode active layer is arranged on the surface of the first current collecting layer away from the insulating layer, and the negative electrode active layer is arranged on The surface of the second current collecting layer is away from the insulating layer.
  • the pole piece includes a positive electrode active layer, a first current collecting layer, an insulating layer, a second current collecting layer and a negative electrode active layer arranged sequentially along a first direction. After a plurality of the pole pieces are stacked and arranged along the first direction to form an electrode assembly , the first current collector of each pole piece is conductively connected, and the second current collector of each pole piece is conductively connected, thereby forming an internal parallel electrode assembly, which is beneficial to reducing the internal resistance of the battery with the electrode assembly, thereby increasing the charging process The current of the battery and the battery cell is increased to increase the charging rate of the battery cell and the battery.
  • the battery cells disclosed in the embodiments of the present application and provided with the electrode assemblies provided by the embodiments of the present application can be used, but are not limited to, in electrical equipment such as vehicles, ships, or aircrafts. Battery cells equipped with the electrode assemblies disclosed in the present application can also be used. Batteries and other components form the power supply system of the electrical equipment, which is beneficial to improving the energy density of battery cells and batteries.
  • Embodiments of the present application provide an electrical device that uses a battery as a power source.
  • the electrical device may be, but is not limited to, a mobile phone, a tablet, a laptop, an electric toy, an electric tool, a battery car, an electric vehicle, a ship, a spacecraft, etc.
  • electric toys can include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, electric airplane toys, etc.
  • spacecraft can include airplanes, rockets, space shuttles, spaceships, etc.
  • an electrical device is a vehicle 1000 as an example.
  • the vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle.
  • the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc.
  • the battery 100 is disposed inside the vehicle 1000 , and the battery 100 may be disposed at the bottom, head, or tail of the vehicle 1000 .
  • the battery 100 may be used to power the vehicle 1000 , for example, the battery 100 may serve as an operating power source for the vehicle 1000 .
  • the vehicle 1000 may also include a controller 200 and a motor 300 .
  • the controller 200 is used to control the battery 100 to provide power to the motor 300 , for example, for starting, navigating, and driving the vehicle 1000 to meet operating power requirements.
  • the battery 100 can not only be used as an operating power source for the vehicle 1000 , but also can be used as a driving power source for the vehicle 1000 , replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000 .
  • the battery 100 includes a case 10 and a battery cell 20 .
  • the battery cell 20 is accommodated in the case 10 .
  • the box 10 is used to provide an accommodation space for the battery cells 20, and the box 10 can adopt a variety of structures.
  • the box 10 may include a first part 11 and a second part 12 , the first part 11 and the second part 12 cover each other, and the first part 11 and the second part 12 jointly define a space for accommodating the battery cells 20 of accommodation space.
  • the second part 12 may be a hollow structure with one end open to form a receiving cavity for accommodating the battery cell 20 .
  • the first part 11 may be a plate-like structure.
  • the first part 11 is covered with the open side of the second part 12 so that the first part 11 Together with the second part 12, an accommodation space is defined; the first part 11 and the second part 12 may also be a hollow structure with one side open to form an accommodation cavity for accommodating the battery cell 20, and the open side of the first part 11 is closed. on the open side of the second part 12.
  • the box 10 formed by the first part 11 and the second part 12 can be in various shapes, such as cylinder, rectangular parallelepiped, etc.
  • the battery 100 there may be a plurality of battery cells 20, and the plurality of battery cells 20 may be connected in series, in parallel, or in mixed connection.
  • Mixed connection means that the plurality of battery cells 20 are connected in series and in parallel.
  • the plurality of battery cells 20 can be directly connected in series or in parallel or mixed together, and then the whole composed of the plurality of battery cells 20 can be accommodated in the box 10 ; of course, the battery 100 can also be a plurality of battery cells 20 First, the battery modules are connected in series, parallel, or mixed to form a battery module, and then multiple battery modules are connected in series, parallel, or mixed to form a whole, and are accommodated in the box 10 .
  • the battery 100 may also include other structures.
  • the battery 100 may further include a bus component for realizing electrical connections between multiple battery cells 20 .
  • the battery 100 may further include a bus component (not shown), through which the multiple battery cells 20 may be electrically connected to achieve series, parallel, or mixed connection of the multiple battery cells 20 .
  • a bus component (not shown), through which the multiple battery cells 20 may be electrically connected to achieve series, parallel, or mixed connection of the multiple battery cells 20 .
  • Each battery cell 20 may be a secondary battery or a primary battery; it may also be a lithium-sulfur battery, a sodium-ion battery or a magnesium-ion battery, but is not limited thereto.
  • the battery cells 20 may be flat, rectangular, or other shapes.
  • the battery cell 20 may include a case 21 , an electrode assembly 22 and an end cap 23 .
  • the housing 21 has an opening 211
  • the electrode assembly 22 is accommodated in the housing 21
  • the end cap 23 is used to cover the opening 211 .
  • the housing 21 can be in various shapes, such as elliptical structure, trapezoidal structure, hexagonal prism, etc.
  • the contour of the electrode assembly 22 can be adapted to the structural shape of the housing 21 .
  • the electrode assembly 22 can have a trapezoidal structure; if the housing 21 has an oval shape, the outline of the electrode assembly 22 can adapt to the outline of the housing 21 .
  • the housing 21 can also be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, etc., which are not particularly limited in the embodiment of the present application.
  • the end cap 23 refers to a component that covers the opening 211 of the housing 21 to isolate the internal environment of the battery cell 20 from the external environment.
  • the shape of the end cap 23 can be adapted to the shape of the housing 21 to fit the housing 21 .
  • the end cap 23 can be made of a material with a certain hardness and strength (such as aluminum alloy). In this way, the end cap 23 is less likely to deform when subjected to extrusion and collision, so that the battery cell 20 can have higher durability. Structural strength and safety performance can also be improved.
  • the end cap 23 is used to cover the opening 211 of the housing 21 to form a sealed installation space (not shown), and the installation space is used to accommodate the electrode assembly 22 .
  • the installation space is also used to accommodate electrolytes, such as electrolytes.
  • the end cap 23 is also provided with an electrode terminal 24 for outputting the electric energy of the electrode assembly 22.
  • the electrode terminal 24 is used for electrical connection with the electrode assembly 22, that is, the electrode terminal 24 is electrically connected to the tab (not shown in the figure) of the electrode assembly 22. , for example, the electrode terminal 24 and the tab are connected through a current collecting member (not shown in the figure) to realize the electrical connection between the electrode terminal 24 and the tab.
  • the opening 211 of the housing 21 may be one or two. If the opening 211 of the housing 21 is one, the end cover 23 can also be one, and two electrode terminals 24 can be provided in the end cover 23.
  • the two electrode terminals 24 are respectively the positive electrode terminal 24a and the negative electrode terminal 24b.
  • the positive electrode The terminal 24a and the negative electrode terminal 24b are respectively used to electrically connect the positive electrode lug 2226 (shown in FIG. 8 ) and the negative electrode lug 2227 (shown in FIG. 8 ) of the electrode assembly 22 .
  • the two electrode terminals 24 in the end cap 23 are respectively Positive electrode terminal 24a and negative electrode terminal 24b.
  • the electrode terminal 24 in one end cover 23 may be a positive electrode terminal 24a for electrical connection with the positive electrode lug 2226 of the electrode assembly 22; the electrode terminal 24 in the other end cover 23 may be a negative electrode terminal. 24b, used for electrical connection with the negative electrode ear 2227 of the electrode assembly 22.
  • the end cap 23 can also be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which are not particularly limited in the embodiment of the present application.
  • the housing 21 and the end cover 23 may be independent components, and an opening 211 may be provided on the housing 21.
  • the end cover 23 covers the opening 211 at the opening 211 to form the internal environment of the battery cell 20.
  • the end cover 23 and the housing 21 can also be integrated.
  • the end cover 23 and the housing 21 can form a common connection surface before other components are put into the housing. When it is necessary to encapsulate the inside of the housing 21 When the end cap 23 is closed, the housing 21 is closed.
  • a pressure relief mechanism 25 may also be provided on the end cover 23 .
  • the pressure relief mechanism 25 is used to relieve the pressure inside the battery cell 20 when the pressure or temperature inside the battery cell 20 reaches a threshold value.
  • the pressure relief mechanism 25 may take the form of an explosion-proof valve, an explosion-proof disk, an air valve, a pressure relief valve, a safety valve, a weak portion formed on the end cover 23, etc.
  • the electrode assembly 22 includes an isolation film 221 and a plurality of pole pieces 222 .
  • the plurality of pole pieces 222 are stacked along the first direction X. Two adjacent pole pieces 222 are insulated and separated by an isolation film 221 .
  • the material of the isolation film 221 may be PP (polypropylene, polypropylene) or PE (polyethylene, polyethylene).
  • the pole piece 222 includes a positive active layer 2221 , a first current collecting layer 2222 , an insulating layer 2223 , a second current collecting layer 2224 and a negative active layer that are stacked along the first direction X. 2225, the insulating layer 2223 is provided between the first current collecting layer 2222 and the second current collecting layer 2224, the positive electrode active layer 2221 is provided on the surface of the first current collecting layer 2222 away from the insulating layer 2223, and the negative electrode active layer 2225 is provided on the second current collecting layer 2222.
  • the current collecting layer 2224 is away from the surface of the insulating layer 2223 .
  • the positive electrode active layer 2221 is disposed on the first current collecting layer 2222 and the negative electrode active layer 2225 is disposed on the second current collecting layer 2224.
  • the embodiments of this application are not limited.
  • the positive electrode active layer 2221 can be coated in gaps or continuously.
  • the negative active layer 2225 can be coated on the surface of the second current collecting layer 2224 facing away from the insulating layer 2223 with gaps or continuously.
  • the material of the first current collecting layer 2222 can be aluminum, titanium, stainless steel, carbon-based composite materials, etc.
  • the positive active layer 2221 can be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganate.
  • the material of the second current collecting layer 2224 can be copper, nickel, titanium, stainless steel, carbon-based composite materials, etc.
  • the negative electrode active layer 2225 can be carbon or silicon, etc.
  • the insulating layer 2223 is disposed between the first current collecting layer 2222 and the second current collecting layer 2224.
  • the insulating layer 2223 insulates and separates the first current collecting layer 2222 and the second current collecting layer 2224 to avoid the first current collecting layer 2222 and the second current collecting layer 2224.
  • the current collector layer 2224 contacts to cause a short circuit, thereby improving the safety performance of the battery 100 with the pole piece 222 .
  • the insulating layer 2223 can also play a supporting role to improve the structural strength of the composite structure composed of the first current collecting layer 2222, the insulating layer 2223 and the second current collecting layer 2224.
  • the material of the insulating layer 2223 may be an inert material, such as PET (polyethylene terephthalate), PP (polypropylene), etc.
  • the pole piece 222 includes a positive electrode active layer 2221, a first current collecting layer 2222, an insulating layer 2223, a second current collecting layer 2224 and a negative electrode active layer 2225 arranged sequentially along the first direction X. After the electrode assembly 22 is formed by being stacked in one direction The internal resistance of the electrode assembly 22 of the battery 100 increases the current during the charging process of the battery 100 to increase the charging rate of the battery cell 20 and the battery 100 .
  • the pole piece 222 also includes a positive tab 2226 and a negative tab 2227.
  • the positive tab 2226 is connected to the first current collecting layer 2222, and the negative tab 2227 is connected to the second current collecting layer. 2224.
  • the positive electrode tab 2226 is connected to the first current collecting layer 2222, and the positive electrode tab 2226 protrudes from the first current collecting layer 2222 along the second direction Y.
  • the positive electrode tab 2226 and the first current collecting layer 2222 may be integrally formed.
  • the positive electrode tab 2226 and the first current collecting layer 2222 are formed by die-cutting from a base material.
  • the positive electrode tab 2226 and the first current collecting layer 2222 may also be arranged separately and then connected to form an integral structure.
  • the positive electrode tab 2226 and the first current collecting layer 2222 may be welded to form an integral structure.
  • the positive electrode tab 2226 and the first current collecting layer 2222 can be arranged separately and then connected to form an integral structure
  • the positive electrode tab 2226 can be connected to the end surface of the first current collecting layer 2222 along the second direction Y, then the positive electrode tab The projection of 2226 along the second direction Y on the plane perpendicular to the second direction Y does not overlap with the projection of the first current collecting layer 2222 along the second direction Y on the plane perpendicular to the second direction Y.
  • the positive electrode tab 2226 can also be connected to the surface of the first current collecting layer 2222 in the first direction X.
  • the material of the positive tab 2226 and the first current collecting layer 2222 may be the same or different.
  • the negative electrode tab 2227 is connected to the second current collecting layer 2224, and the negative electrode tab 2227 protrudes from the second current collecting layer 2224 along the second direction Y.
  • the negative electrode tab 2227 and the second current collecting layer 2224 may be integrally formed.
  • the negative electrode tab 2227 and the second current collecting layer 2224 are formed by die-cutting from a base material.
  • the negative electrode tab 2227 and the second current collecting layer 2224 can also be arranged separately and then connected to form an integral structure.
  • the negative electrode tab 2227 and the second current collecting layer 2224 can be welded to form an integral structure.
  • the negative electrode tab 2227 and the second current collecting layer 2224 can be arranged separately and then connected to form an integral structure
  • the negative electrode tab 2227 can be connected to the end surface of the second current collecting layer 2224 along the second direction Y, then the negative electrode tab
  • the projection of 2227 along the second direction Y on the plane perpendicular to the second direction Y does not overlap with the projection of the second current collection layer 2224 along the second direction Y on the plane perpendicular to the second direction Y.
  • the negative electrode tab 2227 can also be connected to the surface of the second current collecting layer 2224 in the first direction X.
  • the negative electrode tab 2227 can also be connected to the surface of the second current collecting layer 2224 in the first direction 2227 extends along the second direction Y and protrudes from the second current collecting layer 2224, then the projection of the negative electrode tab 2227 along the second direction Y on the plane perpendicular to the second direction Y is consistent with the second current collecting layer 2224 along the second direction Y. Projections on a plane perpendicular to the second direction Y partially overlap.
  • the material of the negative electrode tab 2227 and the material of the second current collecting layer 2224 may be the same or different.
  • the arrangement of the positive electrode tab 2226 and the negative electrode tab 2227 facilitates the internal parallel connection of the electrode assembly 22 .
  • the positive electrode tab 2226 and the negative electrode tab 2227 are located on the same side of the pole piece 222 along the second direction Y, and the second direction Y is perpendicular to the first direction X.
  • the positive electrode tab 2226 and the negative electrode tab 2227 are located on the same side of the pole piece 222", it can be understood that the positive electrode tab 2226 protrudes from one side of the first current collecting layer 2222 along the second direction Y and the negative electrode tab 2227 protrudes along the second direction Y.
  • the side protruding from the second current collecting layer 2224 is the same.
  • the negative electrode tab 2227 may be located on the same side of the electrode assembly 22 along the second direction Y.
  • the positive electrode tab 2226 and the negative electrode tab 2227 are disposed on the same side of the pole piece 222 to facilitate the internal parallel connection of the electrode assembly 22 formed through the pole piece 222 .
  • the projections of the positive electrode tab 2226 and the negative electrode tab 2227 on a plane perpendicular to the first direction X do not overlap.
  • the projections of the positive electrode tabs 2226 and the negative electrode tabs 2227 on the plane perpendicular to the first direction 2226 and the negative electrode ear 2227 are not in contact, thereby reducing the risk of short circuit between the battery cell 20 and the battery 100 including the electrode piece 222 .
  • the positive electrode tab 2226 and the negative electrode tab 2227 are located on opposite sides of the pole piece 222 along the second direction Y, and the second direction Y is perpendicular to the first direction X.
  • the negative electrode tabs 2227 are located on the other side of the electrode assembly 22 along the second direction Y, that is, all the positive electrode tabs 2226 are located on one side of the electrode assembly 22 along the second direction Y, and all the negative electrode tabs 2227 are located on the other side of the electrode assembly 22 along the second direction Y. one side.
  • the positive electrode tabs 2226 and the negative electrode tabs 2227 are respectively located on opposite sides of the pole piece 222. After the electrode assembly 22 is formed, the positive electrode tabs 2226 of each pole piece 222 are located on the same side of the pole piece 222 along the second direction Y. The negative electrode tab 2227 is located on the other side of the pole piece 222 along the second direction Y, which facilitates the conductive connection between the positive electrode tabs 2226 and the conductive connection between the negative electrode tabs 2227, and the positive electrode tabs 2226 and the negative electrode tabs 2227 do not interfere with each other. , reducing the risk of short circuit between the battery cell 20 and the battery 100 including the pole piece 222 .
  • the flow layer 2224 is connected to the first surface 22231 and the second surface 22232 respectively.
  • the first current collecting layer 2222 and the second current collecting layer 2224 are connected to the first surface 22231 and the second surface 22232 respectively" means that the first current collecting layer 2222 is directly connected to the first surface 22231 and the second current collecting layer 2224 Directly connected to second surface 22232.
  • the first current collecting layer 2222 and the insulating layer 2223 are directly connected through laser welding, hot melt connection, etc.
  • the second current collecting layer 2224 and the insulating layer 2223 are directly connected through laser welding, hot melt connection, etc.
  • the first current collecting layer 2222 and the second current collecting layer 2224 are directly connected to the first surface 22231 and the second surface 22232 respectively, which can make the size of the pole piece 222 along the first direction X small enough, which is beneficial to having the pole piece 222
  • the energy density of the battery cell 20 and battery 100 of the finished electrode assembly 22 is directly connected to the first surface 22231 and the second surface 22232 respectively, which can make the size of the pole piece 222 along the first direction X small enough, which is beneficial to having the pole piece 222
  • the energy density of the battery cell 20 and battery 100 of the finished electrode assembly 22 are directly connected to the first surface 22231 and the second surface 22232 respectively, which can make the size of the pole piece 222 along the first direction X small enough, which is beneficial to having the pole piece 222
  • the energy density of the battery cell 20 and battery 100 of the finished electrode assembly 22 is beneficial to having the pole piece 222.
  • the first surface 22231 and the second current collecting layer 2224 are connected to the first surface 22231 through the second adhesive layer 2229.
  • the second adhesive layer 2229 is disposed between the second current collecting layer 2224 and the second surface 22232 of the insulating layer 2223, and the second current collecting layer 2224 and the insulating member are indirectly connected through the second adhesive layer 2229.
  • the first adhesive layer 2228 includes adhesive.
  • the first adhesive layer 2228 may be formed by solidification of a liquid adhesive coated between the first surface 22231 and the first current collecting layer 2222, or may be a double-sided adhesive tape in the form of a strip.
  • the second adhesive layer 2229 includes adhesive.
  • the second adhesive layer 2229 may be formed by solidification of a liquid adhesive coated between the second surface 22232 and the second current collecting layer 2224, or may be a double-sided adhesive tape in the form of a strip.
  • the first current collecting layer 2222 is connected to the first surface 22231 through the first adhesive layer 2228, and the second current collecting layer 2224 is connected to the first surface 22231 through the second adhesive layer 2229.
  • the connection method is simple and convenient, and can improve the performance of the first surface 22231.
  • the connection between the first current collecting layer 2222, the insulating layer 2223 and the second current collecting layer 2224 is stable.
  • the edge of the first current collecting layer 2222 exceeds the edge of the cathode active layer 2221; or, the edge of the first current collecting layer 2222 is flush with the edge of the cathode active layer 2221.
  • the edge of the first current collecting layer 2222 includes an edge located in the second direction Y and an edge located in the third direction Z.
  • the edge of the positive electrode active layer 2221 includes an edge located in the second direction Y and an edge located in the third direction Z.
  • the first direction X, the second direction Y and the third direction Z are perpendicular to each other.
  • the second direction Y is parallel to the width direction of the pole piece 222
  • the third direction Z is parallel to the length direction of the pole piece 222 .
  • the edge of the first current collecting layer 2222 exceeds the edge of the cathode active layer 2221 may mean that part of the edge of the first current collecting layer 2222 exceeds the edge of the cathode active layer 2221, such as the edge of the first current collecting layer 2222 along the second direction Y.
  • the edge exceeds the edge of the cathode active layer 2221 along the second direction Y, and the edge of the first current collecting layer 2222 along the third direction Z is flush with the edge of the cathode active layer 2221 along the third direction Z; or the first current collecting layer 2222 is along
  • the edge of the third direction Z exceeds the edge of the cathode active layer 2221 along the third direction Z, and the edge of the first current collecting layer 2222 along the second direction Y is flush with the edge of the cathode active layer 2221 along the second direction Y.
  • the edge of the first current collecting layer 2222 exceeds the edge of the cathode active layer 2221 may mean that all edges of the first current collecting layer 2222 exceed the edge of the cathode active layer 2221, that is, the edge of the first current collecting layer 2222 along the second direction Y The edge exceeds the edge of the cathode active layer 2221 along the second direction Y, and the edge of the first current collecting layer 2222 along the third direction Z exceeds the edge of the cathode active layer 2221 along the third direction Z.
  • the edge of the first current collecting layer 2222 is flush with the edge of the cathode active layer 2221” means that all edges of the first current collecting layer 2222 are flush with all edges of the cathode active layer 2221, that is, along the edge of the first current collecting layer 2222
  • the edge in the second direction Y is flush with the edge of the cathode active layer 2221 along the second direction Y
  • the edge of the first current collecting layer 2222 along the third direction Z is flush with the edge of the cathode active layer 2221 along the third direction Z.
  • the edge of the first current collecting layer 2222 exceeds the edge of the positive electrode active layer 2221, when disposing the positive electrode active layer 2221 on the first current collecting layer 2222, the process requirements are lower, which can reduce the manufacturing difficulty of the pole piece 222 and improve the manufacturing efficiency. ; If the edge of the first current collecting layer 2222 is flush with the edge of the positive electrode active layer 2221, waste of material of the first current collecting layer 2222 can be avoided.
  • the edge of the second current collecting layer 2224 exceeds the edge of the negative active layer 2225 ; or, the edge of the second current collecting layer 2224 is flush with the edge of the negative active layer 2225 .
  • the edge of the second current collecting layer 2224 includes an edge located in the second direction Y and an edge located in the third direction Z.
  • the edge of the negative electrode active layer 2225 includes an edge located in the second direction Y and an edge located in the third direction Z. edge.
  • the edge of the second current collecting layer 2224 exceeds the edge of the negative electrode active layer 2225" may mean that part of the edge of the second current collecting layer 2224 exceeds the edge of the negative electrode active layer 2225, such as the second current collecting layer 2224 along the second direction Y.
  • the edge exceeds the edge of the negative active layer 2225 along the second direction Y, and the edge of the second current collecting layer 2224 along the third direction Z is flush with the edge of the negative active layer 2225 along the third direction Z; or the second current collecting layer 2224 is along
  • the edge of the third direction Z exceeds the edge of the negative active layer 2225 along the third direction Z, and the edge of the second current collecting layer 2224 along the second direction Y is flush with the edge of the negative active layer 2225 along the second direction Y.
  • the edge of the second current collecting layer 2224 exceeds the edge of the negative electrode active layer 2225 may mean that all edges of the second current collecting layer 2224 exceed the edge of the negative electrode active layer 2225, that is, the second current collecting layer 2224 extends along the second direction Y.
  • the edge exceeds the edge of the negative active layer 2225 along the second direction Y, and the edge of the second current collecting layer 2224 along the third direction Z exceeds the edge of the negative active layer 2225 along the third direction Z.
  • the edge of the second current collecting layer 2224 is flush with the edge of the negative electrode active layer 2225 means that all edges of the second current collecting layer 2224 are flush with all edges of the negative electrode active layer 2225, that is, the edges of the second current collecting layer 2224 are flush with each other.
  • the edge of the second direction Y is flush with the edge of the negative active layer 2225 along the second direction Y
  • the edge of the second current collecting layer 2224 along the third direction Z is flush with the edge of the negative active layer 2225 along the third direction Z.
  • the edge of the second current collecting layer 2224 exceeds the edge of the negative active layer 2225
  • the edge of the first current collecting layer 2222 may exceed the edge of the positive active layer 2221, or the edge of the first current collecting layer 2222 may be in contact with the positive active layer 2221.
  • the edges of the active layer 2221 are flush.
  • the edge of the first current collecting layer 2222 may exceed the edge of the positive active layer 2221, or the edge of the first current collecting layer 2222 may It is flush with the edge of the positive electrode active layer 2221.
  • edge of the second current collecting layer 2224 exceeds the edge of the negative electrode active layer 2225, when disposing the negative electrode active layer 2225 on the second current collecting layer 2224, the process requirements are lower, which can reduce the manufacturing difficulty of the pole piece 222 and improve the manufacturing efficiency. ; If the edge of the second current collecting layer 2224 is flush with the edge of the negative electrode active layer 2225, waste of material of the second current collecting layer 2224 can be avoided.
  • the edge of the negative active layer 2225 exceeds the edge of the positive active layer 2221 ; or, the edge of the negative active layer 2225 is flush with the edge of the positive active layer 2221 .
  • the edge of the negative active layer 2225 exceeds the edge of the positive active layer 2221 may mean that part of the edge of the negative active layer 2225 exceeds the edge of the positive active layer 2221.
  • the edge of the negative active layer 2225 along the second direction Y exceeds the positive active layer 2221.
  • the edge of the negative active layer 2225 along the third direction Z is flush with the edge of the positive active layer 2221 along the third direction Z; or the edge of the negative active layer 2225 along the third direction Z exceeds the positive active layer.
  • the edge of 2221 along the third direction Z, the edge of the negative electrode active layer 2225 along the second direction Y is flush with the edge of the cathode active layer 2221 along the second direction Y.
  • the edge of the negative active layer 2225 exceeds the edge of the positive active layer 2221 may mean that the entire edge of the negative active layer 2225 exceeds the edge of the negative active layer 2221, that is, the edge of the negative active layer 2225 along the second direction Y exceeds the positive active layer. 2221 along the second direction Y, and the edge of the negative active layer 2225 along the third direction Z exceeds the edge of the positive active layer 2221 along the third direction Z.
  • the edge of the negative active layer 2225 is flush with the edge of the positive active layer 2221” means that all edges of the negative active layer 2225 are flush with all edges of the positive active layer 2221, that is, the edge of the negative active layer 2225 along the second direction Y
  • the edge of the cathode active layer 2221 along the second direction Y is flush with the edge of the cathode active layer 2221 along the third direction Z
  • the edge of the anode active layer 2225 along the third direction Z is flush with the edge of the cathode active layer 2221 along the third direction Z.
  • the edge of the negative active layer 2225 exceeds the edge of the positive active layer 2221; or, the edge of the negative active layer 2225 is flush with the edge of the positive active layer 2221, which can reduce the risk of lithium deposition in the battery cell 20 and battery 100 equipped with the electrode piece 222. .
  • the edge of the positive active layer 2221 may also exceed the edge of the negative active layer 2225 .
  • the edge of the positive active layer 2221 along the second direction Y may exceed the edge of the negative active layer 2225 along the second direction Y, and the edge of the positive active layer 2221 along the third direction Z is consistent with the edge of the negative active layer 2225 along the third direction Z.
  • the edge of the positive electrode active layer 2221 along the second direction Y is flush with the edge of the negative electrode active layer 2225 along the second direction Y, and the edge of the positive electrode active layer 2221 along the third direction Z exceeds the negative electrode active layer 2225
  • the edge along the third direction Z; the edge along the second direction Y of the positive electrode active layer 2221 may exceed the edge along the second direction Y of the negative electrode active layer 2225, and the edge of the positive electrode active layer 2221 along the third direction Z exceeds the negative electrode active layer 2225The edge along the third direction Z.
  • the electrode assembly 22 includes a plurality of pole pieces 222 provided in any of the above embodiments.
  • the plurality of pole pieces 222 are stacked along the first direction X. set up.
  • “Plural” appearing in this application means two or more (including two).
  • An isolation film 221 is provided between two adjacent pole pieces 222 for insulating and isolating the two adjacent pole pieces 222 .
  • the negative active layer 2225 of one of the two adjacent pole pieces 222 faces and covers the positive active layer 2221 of the other.
  • the negative active layer 2225 of one of the two adjacent pole pieces 222 faces and covers the positive active layer 2221 of the other means that the positive active layer 2221 of one of the two adjacent pole pieces 222 is in The projection of the other negative electrode active layer 2225 is located within the negative electrode active layer 2225 or the outline of the projection of the positive electrode active layer 2221 of one of the two adjacent pole pieces 222 on the other negative electrode active layer 2225 It completely coincides with the outline of the negative active layer 2225.
  • the first current collecting layers 2222 of all pole pieces 222 are electrically connected, and the second current collecting layers 2224 of all the pole pieces 222 are electrically connected, thereby achieving internal parallel connection of the electrode assemblies 22 .
  • the pole pieces 222 include positive pole tabs 2226 and negative pole tabs 2227
  • the first current collecting layers 2222 of all pole pieces 222 are electrically connected through the positive pole tabs 2226
  • the second current collecting layers of all pole pieces 222 are electrically connected through the positive pole tabs 2226.
  • the layers 2224 are electrically connected through the negative tabs 2227, thereby achieving internal parallel connection of the electrode assemblies 22.
  • the first current collecting layers 2222 of all pole pieces 222 are electrically connected to the positive electrode terminal 24 a through the positive electrode tab 2226
  • the second current collecting layers 2224 of all the pole pieces 222 are electrically connected to the negative electrode tab 2227 It is electrically connected to the negative electrode terminal 24b.
  • the electrode assembly 22 includes a plurality of pole pieces 222 provided in any embodiment of the first aspect that are stacked along the first direction and the internal resistance of the battery 100, thereby increasing the current of the battery cell 20 and the battery 100, so as to increase the charging rate of the battery cell 20 and the battery 100.
  • the lengths of the positive active layers 2221 of the plurality of pole pieces 222 gradually decrease along the first direction X.
  • the length of the positive electrode active layer 2221 refers to the size of the positive electrode active layer 2221 along the length direction of the electrode piece 222 (the third direction Z).
  • the first direction X is unidirectional, and the first direction X is parallel to the thickness direction of the pole piece 222 .
  • both ends of the longer one of the positive electrode active layers 2221 of the two adjacent pole pieces 222 along the length direction of the pole piece 222 may exceed both ends of the smaller one; or
  • one end of the longer one of the positive electrode active layers 2221 of the two adjacent pole pieces 222 along the length direction of the pole piece 222 can be flush with one end of the smaller one.
  • the other end of the longer one of the positive electrode active layers 2221 of the two adjacent pole pieces 222 exceeds the other end of the shorter one along the length direction of the pole piece 222 .
  • the length of the positive active layer 2221 of the plurality of pole pieces 222 gradually decreases along the first direction
  • the abnormal shape of the internal space of the housing 21 may be caused by the different shapes and/or sizes of the various walls of the housing 21.
  • the housing 21 includes a first wall 212 opposite along the first direction X and a The second wall 213 and the third wall 214 and the fourth wall 215 opposite along the length direction of the pole piece 222 (third direction Z), the first wall 212 and the second wall 213 along the length direction of the first pole piece 222
  • the sizes are different, and both ends of the second wall 213 along the length direction of the pole piece 222 exceed the two ends of the first wall 212 along the length direction of the pole piece 222 .
  • the third wall 214 is connected to the first wall 212 along the length direction of the pole piece 222 .
  • the first wall 212 and the second wall 213 are respectively arranged at an obtuse angle and an acute angle with the third wall 214; the fourth wall 215 is connected to the first Between the other end of the wall 212 along the length direction of the pole piece 222 and the other end of the second wall 213 along the length direction of the pole piece 222, the first wall 212 and the second wall 213 are respectively arranged at an obtuse angle and an acute angle with the fourth wall 215. , so that the two first walls 212 and the two second walls 213 together form a special-shaped inner width space.
  • the special shape of the internal space of the housing 21 may be formed by the transitional connection of two adjacent walls of the housing 21 through an arc transition wall.
  • the lengths of the negative active layers 2225 of the plurality of pole pieces 222 gradually decrease along the first direction X.
  • the length of the negative electrode active layer 2225 refers to the size of the negative electrode active layer 2225 along the length direction of the electrode piece 222 (the third direction Z).
  • the length of the positive electrode active layer 2221 is longer, the length of the negative electrode active layer 2225 facing and covering the positive electrode active layer 2221 will also be correspondingly longer to reduce the risk of lithium precipitation in the electrode assembly 22 .
  • the length of the positive electrode active layer 2221 is smaller, the length of the negative electrode active layer 2225 facing and covering the positive electrode active layer 2221 will also be correspondingly smaller, which not only reduces the risk of lithium precipitation, but also avoids waste of active materials.
  • the length of the positive electrode active layer 2221 of all pole pieces 222 gradually decreases along the first direction X
  • the length of the negative electrode active layer 2225 of the pole piece 222 gradually decreases along the first direction
  • the changing trend of the length of the active layer 2225 along the first direction X is the same as the changing trend of the length of the positive active layer 2221 along the first direction
  • the changing trend of the length enables the length of the negative active layer 2225 of the pole piece 222 to also adapt to the special-shaped internal space of the housing 21, so that the special-shaped internal space of the housing 21 can be fully utilized, thereby conducive to improving the electrode assembly.
  • the energy density of the battery cell 20 and battery 100 is 22.
  • the lengths of the positive active layers 2221 of two adjacent pole pieces 222 are the same; and the lengths of the negative active layers 2225 of the two adjacent pole pieces 222 are the same.
  • both ends of the positive active layers 2221 of the two adjacent pole pieces 222 are flush along the length direction of the pole pieces 222 (the third direction Z).
  • the two ends of the positive active layer 2221 of the two adjacent pole pieces 222 along the width direction (the second direction Y) of the pole piece 222 may be flush; or, the positive active layer of one of the two adjacent pole pieces 222
  • One end of 2221 along the width direction (second direction Y) of the pole piece 222 is flush with one end of the other positive electrode active layer 2221 along the width direction (second direction Y) of the pole piece 222, and the two adjacent pole pieces
  • the other end of the positive active layer 2221 of one of the 222 along the width direction (second direction Y) of the pole piece 222 exceeds the other end of the positive active layer 2221 of the other one along the width direction (second direction Y) of the pole piece 222 ;
  • both ends of the negative active layers 2225 of two adjacent pole pieces 222 are flush along the length direction of the pole pieces 222 (the third direction Z).
  • the two ends of the negative active layer 2225 of the two adjacent pole pieces 222 along the width direction (the second direction Y) of the pole piece 222 may be flush; or, the negative active layer of one of the two adjacent pole pieces 222
  • One end of 2225 along the width direction (second direction Y) of the pole piece 222 is flush with one end of the other negative electrode active layer 2225 along the width direction (second direction Y) of the pole piece 222, and the two adjacent pole pieces
  • the other end of the negative active layer 2225 of one of the 222 along the width direction (second direction Y) of the pole piece 222 exceeds the other end of the negative active layer 2225 of the other one along the width direction (second direction Y) of the pole piece 222 ;
  • This form of electrode assembly 22 can adapt to the casing 21 with regular internal space and make full use of the space inside the casing 21 .
  • An embodiment of the present application also provides a battery cell 20.
  • the battery cell 20 includes the electrode assembly 22 provided in any of the above embodiments.
  • the electrode assembly 22 provided in any of the above embodiments can realize internal parallel connection. Therefore, the internal resistance of the battery cell 20 including the electrode assembly 22 provided in any embodiment is small, thereby increasing the current of the battery cell 20 to improve The charging rate of the battery cell 20.
  • the embodiment of the present application also provides a battery 100.
  • the battery 100 includes a box 10 and the battery cell 20 provided in the above embodiment; the battery cell 20 is accommodated in the box 10.
  • the internal resistance of the above-mentioned battery cells 20 is small, thereby increasing the current of the battery 100 to increase the charging rate of the battery 100 .
  • An embodiment of the present application also provides an electrical device.
  • the electrical device includes the battery 100 provided in the above embodiment.
  • the embodiment of the present application provides a pole piece 222.
  • the pole piece 222 includes a positive electrode active layer 2221, a first current collector, an insulating layer 2223, a second current collector layer 2224, a negative electrode active layer 2225, a positive electrode tab 2226 and a negative electrode tab 2227.
  • the positive electrode active layer 2221, the first current collector, the insulating layer 2223, the second current collector layer 2224 and the negative electrode active layer 2225 are stacked along the first direction X.
  • the insulating layer 2223 is disposed between the first current collecting layer 2222 and the second current collecting layer 2224, the positive electrode active layer 2221 is disposed on the surface of the first current collecting layer 2222 away from the insulating layer 2223, and the negative electrode active layer 2225 is disposed on the second current collecting layer 2222.
  • the flow layer 2224 faces away from the surface of the insulating layer 2223 .
  • the positive electrode tab 2226 is connected to one side of the first current collecting layer 2222 along the width direction of the pole piece 222
  • the negative electrode tab 2227 is connected to one side of the second current collecting layer 2224 along the width direction of the pole piece 222 .

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

Abstract

La présente invention concerne une feuille d'électrodes, un ensemble électrodes, une cellule de batterie, une batterie et un dispositif électrique, qui se rapportent au domaine technique des batteries. La feuille d'électrode comprend une couche active d'électrode positive, une première couche de collecte de courant, une couche d'isolation, une seconde couche de collecte de courant et une couche active d'électrode négative qui sont empilées dans une première direction. La couche d'isolation est disposée entre la première couche de collecte de courant et la seconde couche de collecte de courant. La couche active d'électrode positive est disposée sur la surface de la première couche de collecte de courant à l'opposé de la couche d'isolation. La couche active d'électrode négative est disposée sur la surface de la seconde couche de collecte de courant à l'opposé de la couche d'isolation. Après que de multiples feuilles d'électrodes sont empilées dans la première direction pour former l'ensemble électrodes, les premiers collecteurs de courant des feuilles d'électrodes sont connectés de manière conductrice, et les seconds collecteurs de courant des feuilles d'électrodes sont connectés de manière conductrice, de façon à former des ensembles électrodes qui sont connectés de manière interne en parallèle. Par conséquent, la résistance interne d'une batterie ayant les ensembles électrodes peut être réduite, le courant dans le processus de charge de batterie est ainsi augmenté, et les taux de charge de la cellule de batterie et de la batterie sont améliorés.
PCT/CN2022/111219 2022-08-09 2022-08-09 Feuille d'électrodes, ensemble électrodes, cellule de batterie, batterie et dispositif électrique WO2024031353A1 (fr)

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PCT/CN2022/111219 WO2024031353A1 (fr) 2022-08-09 2022-08-09 Feuille d'électrodes, ensemble électrodes, cellule de batterie, batterie et dispositif électrique

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CN212659570U (zh) * 2020-07-28 2021-03-05 深圳市海鸿新能源技术有限公司 一种双极性集流体、极片及电芯
WO2022022324A1 (fr) * 2020-07-28 2022-02-03 厦门海辰新能源科技有限公司 Collecteur de courant bipolaire, masses polaires et batterie rechargeable
WO2022095392A1 (fr) * 2020-11-05 2022-05-12 江苏卓高新材料科技有限公司 Plaque d'électrode, procédé de fabrication, batterie secondaire et dispositif de production
CN214313252U (zh) * 2021-01-26 2021-09-28 广东微电新能源有限公司 一种电芯用的电极片以及电池
CN112838259A (zh) * 2021-03-02 2021-05-25 厦门海辰新材料科技有限公司 一种极片组件、电芯以及电池
CN214797496U (zh) * 2021-03-02 2021-11-19 厦门海辰新材料科技有限公司 一种极片组件、电芯以及电池
CN217062222U (zh) * 2022-03-18 2022-07-26 蔚来汽车科技(安徽)有限公司 锂离子电池以及包含其的车辆

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