WO2023130237A1 - Ensemble électrode, cellule de batterie, batterie et dispositif électrique - Google Patents

Ensemble électrode, cellule de batterie, batterie et dispositif électrique Download PDF

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Publication number
WO2023130237A1
WO2023130237A1 PCT/CN2022/070208 CN2022070208W WO2023130237A1 WO 2023130237 A1 WO2023130237 A1 WO 2023130237A1 CN 2022070208 W CN2022070208 W CN 2022070208W WO 2023130237 A1 WO2023130237 A1 WO 2023130237A1
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WIPO (PCT)
Prior art keywords
pole piece
protective layer
straight
electrode assembly
bent
Prior art date
Application number
PCT/CN2022/070208
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English (en)
Chinese (zh)
Inventor
周建华
宋晋阳
Original Assignee
宁德时代新能源科技股份有限公司
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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 CN202280021829.2A priority Critical patent/CN117015892A/zh
Priority to PCT/CN2022/070208 priority patent/WO2023130237A1/fr
Publication of WO2023130237A1 publication Critical patent/WO2023130237A1/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
    • 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
    • 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 field of battery technology, and more specifically, relates to an electrode assembly, a manufacturing method and system thereof, a battery cell, a battery, and an electrical device.
  • Battery cells are widely used in electronic equipment, such as mobile phones, laptop computers, battery cars, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes and electric tools, etc.
  • the battery cells may include nickel-cadmium battery cells, nickel-hydrogen battery cells, lithium-ion battery cells, secondary alkaline zinc-manganese battery cells, and the like.
  • the present application provides an electrode assembly, a manufacturing method thereof, a manufacturing system, a battery cell, a battery and an electrical device, which can improve safety.
  • an embodiment of the present application provides an electrode assembly, which includes a pole piece and a separator, the pole piece and the separator are wound along the winding direction to form a winding structure, and the winding structure includes a bending area and is connected to In the flat area of the bent area, the pole piece includes a plurality of bent portions located in the bent area and a plurality of straight portions located in the straight area.
  • the outermost bent portion of the pole piece is the first bent portion, and at least one straight portion at the outermost side of the pole piece is the first straight portion connected to the first bent portion.
  • a first protection layer is attached to the surface of the pole piece, and the first protection layer covers at least part of the junction of the first bent portion and the first straight portion.
  • the strength of the junction of the first bent portion and the first straight portion can be increased, thereby reducing the extreme The risk of the sheet cracking at the junction of the first bent portion and the first straight portion; in addition, even if the pole piece is cracked at the junction of the first bent portion and the first straight portion, the first protective layer can The formed sharp structures such as burrs and debris are separated from the separator to reduce the risk of short circuit caused by the puncture of the separator and improve safety.
  • the tensile strength of the first protective layer is greater than the tensile strength of the pole piece.
  • the first protective layer has relatively high tensile strength, which can effectively increase the tensile capacity of the joint between the first bent part and the first straight part, and reduce the tensile strength of the first bent part and the second straight part.
  • Tensile deformation at the joint of a straight portion reduces the risk of pole piece cracking and improves safety.
  • the tensile strength of the first protective layer is 50MPa-500MPa.
  • the tensile strength of the first protective layer is set at 50MPa-500MPa, so as to reduce the risk of cracking of the pole piece on the premise that the first bending part can be bent smoothly.
  • the first protective layer is attached to both sides of the junction of the first bent portion and the first straight portion.
  • the first protective layer on the outer side of the connection between the first bent portion and the first straight portion can separate the connection from the casing, reducing the risk of contact between the sharp structure formed by the pole piece cracking and the casing.
  • the first protective layer inside the junction of the first bent portion and the first straight portion can separate the junction from other bent portions, reducing the risk that the sharp structure formed by the crack of the pole piece will contact other bent portions.
  • one end of the first protective layer is attached to the first bent portion, and the other end of the first protective layer is attached to the first straight portion.
  • the size of the part of the first protective layer attached to the first bending part is L1
  • the size of the first bending part is L2
  • L1 and L2 satisfy: 0.01 ⁇ L1 /L2 ⁇ 0.5.
  • the value of L1/L2 is set at 0.01-0.5 to ensure the safety and capacity of the electrode assembly.
  • the dimension of the portion of the first protective layer attached to the first straight portion is L3, the dimension of the first straight portion is L4, and L3 and L4 satisfy: 0.01 ⁇ L3 /L4 ⁇ 0.2.
  • the value of L3/L4 is set at 0.01-0.2 to ensure the safety and capacity of the electrode assembly.
  • the first protective layer includes a base area and two edge areas, and the two edge areas are respectively located at two ends of the base area along the winding direction. In the direction away from the base region, the thickness of the edge region decreases between them.
  • the edge area is thinned to reduce the stress concentration between the pole piece and the first protective layer, and reduce the risk of the pole piece being cracked by the first protective layer.
  • the surface of the edge region facing away from the pole piece is an arcuate surface.
  • the arc-shaped surface is relatively smooth, which can better disperse stress, reduce stress concentration on the pole piece, and reduce the risk of pole piece cracking.
  • the first protective layer covers at least the middle region of the connection.
  • the expansion deformation is the largest in the middle; correspondingly, the middle area of the connection between the first bent portion and the first straight portion is easier to crack than the edge area. Therefore, the first protective layer in the above solution at least covers the middle region of the connection, so as to reduce the risk of cracking in the middle region of the connection.
  • the size of the first protective layer is L5
  • the size of the pole piece is L6, and L5 and L6 satisfy: L5/L6 ⁇ 0.2.
  • the value of L5/L6 is set to be greater than or equal to 0.2, so as to reduce the risk of cracks extending beyond the first protective layer, thereby improving safety.
  • the edge of the first protective layer is flush with the edge of the pole piece.
  • the first protective layer can cover the crack, thereby reducing safety risks.
  • the first protective layer is attached to both sides of the junction of the first bent portion and the first straight portion.
  • the edges of the two first protective layers located at the same end in the axial direction both exceed the pole pieces and are connected to each other.
  • the two first protective layers are connected to each other, which can reduce the risk of the first protective layer falling off from the pole piece and improve the reliability of the first protective layer.
  • both edges of the first protection layer in the axial direction are beyond the pole piece, and the two edges of one first protection layer are respectively connected to the two edges of the other first protection layer.
  • the two first protective layers are connected to form a ring structure around the joint of the first bent portion and the first straight portion, so as to further improve the strength of the pole piece at the joint and reduce the risk of pole piece cracking.
  • the two first protective layers form an integral structure.
  • the two first protective layers have good integrity, which is convenient for manufacture and installation.
  • the first protective layer is bonded to the pole piece.
  • bonding can ensure the connection strength between the first protective layer and the pole piece, and simplify the assembly process of the first protective layer and the pole piece.
  • the thickness of the first protective layer is 1 ⁇ m-200 ⁇ m.
  • the thickness of the first protective layer is set to 1 ⁇ m-200 ⁇ m to balance the safety and energy density of the electrode assembly.
  • the first protective layer is provided with a plurality of through holes for the electrolyte to pass through, and the through holes and the junction of the first bent portion and the first straight portion are arranged in a staggered manner.
  • the electrolyte can infiltrate the pole piece through the through hole, so as to improve the performance of the pole piece.
  • the connection between the through hole and the first bent portion and the first straight portion is arranged in a staggered manner, which can prevent the through hole from exposing the sharp structure formed when the pole piece is cracked, thereby improving safety.
  • the hardness of the first protective layer is greater than the hardness of the spacer.
  • the first protective layer is less likely to be pierced by sharp structures such as burrs and debris than the separator. In this way, even if the pole piece is cracked at the connection between the first bent portion and the first straight portion, the first The protective layer can also isolate the sharp structure from the spacer to reduce the risk of a short circuit caused by the spacer being punctured and improve safety.
  • the pole piece includes a first pole piece and a second pole piece with opposite polarities, and each of the first pole piece and the second pole piece includes a plurality of bent portions and a plurality of straight portions.
  • the outermost bent portion of the first pole piece is the first bent portion.
  • the outermost bent portion of the second pole piece is the second bent portion, and at least one straight portion of the second pole piece is the second straight portion connected to the second bent portion.
  • a second protective layer is attached to the surface of the second pole piece, and the second protective layer covers at least a part of the junction of the second bent portion and the second straight portion.
  • the risk of cracking of the first pole piece and the risk of cracking of the second pole piece are reduced by providing the first protective layer and the second protective layer.
  • multiple protective layers are attached to the surface of the pole piece, and the connection between each bent portion and the corresponding straight portion is provided with a protective layer.
  • the protective layer arranged at the junction of the first bent portion and the first straight portion is the first protective layer.
  • connection between the bent part and the straight part is a corner area, and the corner area is subjected to a greater force when the pole piece expands.
  • a protective layer is provided in each corner area to minimize the risk of pole piece cracking and improve safety.
  • the present application provides a battery cell, including a casing and the electrode assembly provided in any embodiment of the first aspect, and the electrode assembly is accommodated in the casing.
  • the present application provides a battery, including a plurality of battery cells in the second aspect.
  • the present application provides an electrical device, including the battery cell in the second aspect, and the battery cell is used to provide electric energy.
  • the present application provides a method for manufacturing a battery assembly, which includes: providing a pole piece, and attaching a first protective layer to the surface of the pole piece; providing a separator; winding the pole piece and isolating the pole piece along the winding direction pieces to form a winding structure.
  • the winding structure includes a bending area and a straight area connected to the bending area, and the pole piece includes a plurality of bending portions located in the bending area and a plurality of straight portions located in the straight area; the outermost bending portion of the pole piece The part is the first bent part, and at least one straight part on the outermost side of the pole piece is the first straight part connected to the first bent part; the first protective layer covers the first bent part and the first straight part at least part of the connection.
  • the present application provides a battery assembly manufacturing system, including: a first providing device for providing a pole piece, and attaching a first protective layer on the surface of the pole piece; a second providing device for providing a separator; a winding device for winding the pole piece and the separator along a winding direction to form a wound structure.
  • the winding structure includes a bending area and a straight area connected to the bending area, and the pole piece includes a plurality of bending portions located in the bending area and a plurality of straight portions located in the straight area; the outermost bending portion of the pole piece The part is the first bent part, and at least one straight part on the outermost side of the pole piece is the first straight part connected to the first bent part; the first protective layer covers the first bent part and the first straight part at least part of the connection.
  • Fig. 1 is a schematic structural diagram of a vehicle provided by some embodiments of the present application.
  • Fig. 2 is a schematic explosion diagram of a battery provided by some embodiments of the present application.
  • FIG. 3 is a schematic structural diagram of the battery module shown in FIG. 2;
  • Fig. 4 is a schematic explosion diagram of a battery cell provided by some embodiments of the present application.
  • Fig. 5 is a schematic structural diagram of an electrode assembly provided by some embodiments of the present application.
  • Figure 6 is an enlarged schematic view of the electrode assembly shown in Figure 5 at the circle A;
  • Fig. 7 is a structural schematic diagram of the first pole piece shown in Fig. 5 in an unfolded state
  • Fig. 8 is a schematic structural view of the first pole piece of the electrode assembly provided in other embodiments of the present application in an unfolded state;
  • Fig. 9 is a schematic perspective view of the first pole piece of the electrode assembly provided in some other embodiments of the present application in an unfolded state;
  • Fig. 10 is a schematic perspective view of the first pole piece of the electrode assembly provided in some further embodiments of the present application in an unfolded state;
  • Fig. 11 is a schematic structural diagram of the first protective layer of the electrode assembly provided by some embodiments of the present application.
  • Figure 12 is a partial schematic diagram of an electrode assembly provided by some embodiments of the present application.
  • Fig. 13 is a schematic structural diagram of electrode assemblies provided by other embodiments of the present application.
  • Fig. 14 is a schematic flowchart of a method for manufacturing a battery assembly provided by some embodiments of the present application.
  • Fig. 15 is a schematic block diagram of an electrode assembly manufacturing system provided by some embodiments of the present application.
  • connection In the description of this application, it should be noted that, unless otherwise clearly stipulated and limited, the terms “installation”, “connection”, “connection” and “attachment” should be understood in a broad sense, for example, it may be a fixed connection, It can also be detachably connected or integrally connected; it can be directly connected or indirectly connected through an intermediary, and it can be internal communication between two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in this application according to specific situations.
  • the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of the various components in the embodiments of the application shown in the drawings, as well as the overall thickness, length and width of the integrated device, are for illustrative purposes only, and should not constitute any limitation to the application .
  • “Plurality” in this application refers to two or more (including two).
  • the battery cells may include lithium-ion secondary battery cells, lithium-ion primary battery cells, lithium-sulfur battery cells, sodium-lithium-ion battery cells, sodium-ion battery cells, or magnesium-ion battery cells, etc.
  • the embodiment of the present application does not limit this.
  • the battery mentioned in the embodiments of the present 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 be a battery module or a battery pack.
  • Batteries generally include a case for enclosing one or more battery cells. The box can prevent liquid or other foreign objects from affecting the charging or discharging of the battery cells.
  • the battery cell includes an electrode assembly and an electrolyte, and the electrode assembly includes a positive pole piece, a negative pole piece and a separator.
  • a battery cell works primarily by moving metal ions between the positive and negative pole pieces.
  • the positive electrode sheet includes a positive electrode current collector and a positive electrode active material layer, and the positive electrode active material layer is coated on the surface of the positive electrode current collector; the positive electrode current collector includes a positive electrode current collector and a positive electrode tab, and the positive electrode current collector is coated with a positive electrode active material layer , the positive electrode tab is not coated with the positive electrode active material layer.
  • the material of the positive electrode current collector can be aluminum, the positive electrode active material layer includes the positive electrode active material, and 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, and the negative electrode active material layer is coated on the surface of the negative electrode current collector; the negative electrode current collector includes a negative electrode current collector and a negative electrode tab, and the negative electrode current collector is coated with a negative electrode active material layer , the negative electrode tab is not coated with the negative electrode active material layer.
  • the material of the negative electrode current collector may be copper, the negative electrode active material layer includes the negative electrode active material, and the negative electrode active material may be carbon or silicon.
  • the material of the spacer can be PP (polypropylene, polypropylene) or PE (polyethylene, polyethylene).
  • the battery cell also includes a shell, which is used to accommodate the electrode assembly and the electrolyte, so as to provide a closed space for the electrode assembly and the electrolyte.
  • the pole piece may crack locally, and the burrs formed by the cracking of the pole piece may easily pierce the separator, thereby causing a short circuit and causing a safety hazard.
  • the pole pieces are wound in multiple turns.
  • the pole pieces of the inner circle expand and stretch the pole pieces of the outer circle, so that the pole pieces of the outer circle are subjected to tensile stress; Maximum stress.
  • each pole piece includes a bent part and a straight part; the straight part of the outermost pole piece will squeeze the shell when it expands, so the shell will exert pressure on the straight part of the outermost pole piece.
  • the electrode assembly includes a pole piece and a separator, and the pole piece and the separator are wound along the winding direction to form a winding structure.
  • the winding structure includes The bending area and the straight area connected to the bending area
  • the pole piece includes a plurality of bending parts located in the bending area and a plurality of straight parts located in the straight area.
  • the outermost bent portion of the pole piece is the first bent portion, and at least one straight portion at the outermost side of the pole piece is the first straight portion connected to the first bent portion.
  • a first protection layer is attached to the surface of the pole piece, and the first protection layer covers at least part of the junction of the first bent portion and the first straight portion.
  • the technical solution can increase the strength of the joint between the first bent part and the first straight part by providing the first protective layer, thereby reducing the cracking of the pole piece at the joint between the first bent part and the first straight part
  • the first protective layer can also separate the burr formed by the crack from the separator, so as to reduce the puncture of the separator due to the burr And cause the risk of short circuit, improve safety.
  • Electric devices can be vehicles, mobile phones, portable devices, notebook computers, ships, spacecraft, electric toys and electric tools, and so on.
  • 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 embodiments of the present application do not impose special limitations on the above-mentioned electrical devices.
  • the electric device is taken as an example for description.
  • Fig. 1 is a schematic structural diagram of a vehicle provided by some embodiments of the present application.
  • a battery 2 is arranged inside the vehicle 1 , and the battery 2 can be arranged at the bottom, head or tail of the vehicle 1 .
  • the battery 2 can be used for power supply of the vehicle 1 , for example, the battery 2 can be used as an operating power source of the vehicle 1 .
  • the vehicle 1 may also include a controller 3 and a motor 4 , the controller 3 is used to control the battery 2 to supply power to the motor 4 , for example, for the starting, navigation and working power requirements of the vehicle 1 during driving.
  • the battery 2 can not only be used as an operating power source for the vehicle 1 , but can also be used as a driving power source for the vehicle 1 to provide driving power for the vehicle 1 instead of or partially replacing fuel oil or natural gas.
  • Fig. 2 is a schematic explosion diagram of a battery provided by some embodiments of the present application.
  • the battery 2 includes a box body 5 and a battery cell (not shown in FIG. 2 ), and the battery cell is accommodated in the box body 5 .
  • the box body 5 is used to accommodate the battery cells, and the box body 5 may have various structures.
  • the box body 5 may include a first box body part 5a and a second box body part 5b, the first box body part 5a and the second box body part 5b cover each other, the first box body part 5a and the second box body part 5a
  • the two box parts 5b jointly define an accommodating space 5c for accommodating the battery cells.
  • the second box body part 5b can be a hollow structure with one end open, the first box body part 5a is a plate-shaped structure, and the first box body part 5a covers the opening side of the second box body part 5b to form an accommodating space 5c
  • the box body 5; the first box body portion 5a and the second box body portion 5b also can be a hollow structure with one side opening, and the opening side of the first box body portion 5a is covered on the opening side of the second box body portion 5b , to form a box body 5 with an accommodating space 5c.
  • the first box body part 5a and the second box body part 5b can be in various shapes, such as a cylinder, a cuboid, and the like.
  • a sealant such as sealant, sealing ring, etc.
  • a sealant can also be arranged between the first box body part 5a and the second box body part 5b.
  • the first box part 5a covers the top of the second box part 5b
  • the first box part 5a can also be called an upper box cover
  • the second box part 5b can also be called a lower box.
  • the battery 2 there may be one or more battery cells. If there are multiple battery cells, the multiple battery cells can be connected in series, in parallel or in parallel.
  • the hybrid connection means that there are both series and parallel connections among the multiple battery cells.
  • a plurality of battery cells can be directly connected in series or in parallel or mixed together, and then the whole composed of a plurality of battery cells is accommodated in the box 5; of course, it is also possible to first connect a plurality of battery cells in series or parallel or
  • the battery modules 6 are formed by parallel connection, and multiple battery modules 6 are connected in series or in parallel or in series to form a whole, and are housed in the box body 5 .
  • FIG. 3 is a schematic structural diagram of the battery module shown in FIG. 2 .
  • the multiple battery cells 7 are connected in series, in parallel, or in parallel to form a battery module 6 .
  • a plurality of battery modules 6 are connected in series, in parallel or in parallel to form a whole, and accommodated in the box.
  • the plurality of battery cells 7 in the battery module 6 can be electrically connected through a confluence component, so as to realize parallel connection, series connection or mixed connection of the plurality of battery cells 7 in the battery module 6 .
  • Fig. 4 is a schematic exploded view of a battery cell provided by some embodiments of the present application.
  • the battery cell 7 of the embodiment of the present application includes an electrode assembly 10 and a casing 20 , and the electrode assembly 10 is accommodated in the casing 20 .
  • the electrode assembly 10 is the core component for the battery cell 7 to realize the charge and discharge function, and it includes a positive pole piece, a negative pole piece and a separator.
  • the polarity of the positive pole piece and the negative pole piece is opposite, and the separator is used to connect the positive pole piece
  • the negative pole piece is insulated and isolated.
  • the electrode assembly 10 mainly relies on the movement of metal ions between the positive pole piece and the negative pole piece to work.
  • Electrode assembly 10 There can be one electrode assembly 10 or a plurality of them. Exemplarily, as shown in FIG. 4 , there are two electrode assemblies 10 .
  • the casing 20 is a hollow structure, and an accommodating cavity for accommodating the electrode assembly 10 and electrolyte is formed inside.
  • the housing 20 can be in various shapes, such as cylinder, cuboid and so on.
  • the shape of the casing 20 may be determined according to the specific shape of the electrode assembly 10 . For example, if the electrode assembly 10 has a cylindrical structure, a cylindrical shell can be selected; if the electrode assembly 10 has a rectangular parallelepiped structure, a rectangular parallelepiped shell can be selected.
  • the casing 20 includes a casing 21 and an end cap 22 , the casing 21 has an opening, and the end cap 22 covers the opening and forms a sealed connection to form a sealed space for accommodating the electrode assembly 10 and the electrolyte. .
  • the housing 21 can be a structure with one side opening, and the end cover 22 is provided as one and covers the opening of the housing 21 .
  • the housing 21 can also be a structure with openings on both sides, and there are two end caps 22 , and the two end caps 22 respectively cover the two openings of the housing 21 .
  • the end cover 22 is connected to the housing 21 by welding, bonding, clamping or other means.
  • the battery cell 7 may further include a positive electrode terminal 30 , a negative electrode terminal 40 and a pressure relief mechanism 50 , and the positive electrode terminal 30 , the negative electrode terminal 40 and the pressure relief mechanism 50 are all mounted on the end cap 22 . Both the positive electrode terminal 30 and the negative electrode terminal 40 are used to electrically connect with the positive pole piece and the negative pole piece respectively, so as to lead out the electric energy generated by the electrode assembly 10 .
  • the pressure relief mechanism 50 is used to release the pressure inside the battery cell 7 when the internal pressure of the battery cell 7 reaches a predetermined value.
  • the pressure relief mechanism 50 is located between the positive electrode terminal 30 and the negative electrode terminal 40, and the pressure relief mechanism 50 may be a component such as an explosion-proof valve, a burst disk, a gas valve, a pressure relief valve, or a safety valve.
  • Figure 5 is a schematic structural view of the electrode assembly provided by some embodiments of the present application
  • Figure 6 is an enlarged schematic view of the electrode assembly shown in Figure 5 at the circle A
  • Figure 7 is the first pole piece shown in Figure 5 in an unfolded state The structure diagram below.
  • the electrode assembly 10 of the embodiment of the present application includes a pole piece 11 and a separator 12.
  • the pole piece 11 and the separator 12 are wound along the winding direction W to form a winding structure.
  • the winding structure includes The bending area 13 and the straight area 14 connected to the bending area 13
  • the pole piece 11 includes a plurality of bending portions 111 located in the bending area 13 and a plurality of straight portions 112 located in the straight area 14 .
  • the outermost bent portion 111 of the pole piece 11 is a first bent portion 111a
  • at least one outermost straight portion 112 of the pole piece 11 is a first straight portion 112a connected to the first bent portion 111a.
  • a first protective layer 15 is attached to the surface of the pole piece 11 , and the first protective layer 15 covers at least part of the junction of the first bent portion 111 a and the first straight portion 112 a.
  • the winding direction W is the direction in which the pole piece 11 and the separator 12 are wound circumferentially from the inside to the outside.
  • the winding direction W is counterclockwise.
  • the inner side and the outer side are relative to the winding center of the electrode assembly 10 , the side facing the winding center is the inner side, and the side away from the winding center is the outer side.
  • the separator 12 has a large number of penetrating micropores, which can ensure the free passage of metal ions; for example, the separator 12 has good permeability to lithium ions, so the separator 12 basically cannot block the passage of lithium ions.
  • the material of the spacer 12 may be PP (polypropylene, polypropylene) or PE (polyethylene, polyethylene) or the like.
  • Both the pole piece 11 and the spacer 12 are strip-shaped.
  • the pole piece 11 and the separator 12 may be stacked sequentially, and then wound more than two times to form the electrode assembly 10 .
  • the bending area 13 is the area where the electrode assembly 10 has a bending structure, and the part of the pole piece 11 located in the bending area 13 (ie, the bending portion 111 ) is bent.
  • the bent portion 111 is generally bent into an arc shape.
  • the straight region 14 is a region where the electrode assembly 10 has a flat structure, and the portion of the pole piece 11 located in the straight region 14 (ie, the straight portion 112 ) is substantially straight.
  • the plurality of straight portions 112 are stacked in the thickness direction of the straight portion 112 .
  • the straight portion 112 is generally flat.
  • the junction of the straight portion 112 and the bent portion 111 is the corner area of the pole piece 11 .
  • the pole piece 11 may include two first bending portions 111a, and the two first bending portions 111a are respectively located in the two bending regions 13 .
  • a first protection layer 15 is provided at a junction of at least one first bent portion 111a and the corresponding first straight portion 112a.
  • the pole piece 11 There are two straight portions 112 on the outermost side of the pole piece 11 .
  • the two straight portions 112 one of them may be the first straight portion 112 a, or both may be the first straight portion 112 a.
  • attaching the first protective layer 15 to the pole piece 11 refers to forming the first protective layer 15 on the pole piece 11 by adhesion, coating, spraying or other methods. By attaching, the first protective layer 15 and the pole piece 11 can be connected, reducing or avoiding the movement of the first protective layer 15 relative to the pole piece 11.
  • the first protective layer 15 may completely cover the junction of the first bent portion 111a and the first straight portion 112a, or may only cover the junction of the first bent portion 111a and the first straight portion 112a. part of the place.
  • the first protective layer 15 may be attached only on one side of the junction of the first bent portion 111a and the first straight portion 112a, or may be attached on one side of the joint between the first bent portion 111a and the first straight portion 112a. Both sides of the junction of the portion 112a are attached with the first protective layer 15 .
  • the first protective layer 15 attached to one side of the junction of the first bent portion 111a and the first straight portion 112a may be one, or a plurality of them arranged at intervals.
  • the connection between the first bent portion 111 a and the first straight portion 112 a has a high risk of cracking.
  • the strength of the junction of the first bent portion 111a and the first straight portion 112a can be increased.
  • the first protective layer 15 can also separate sharp structures such as burrs and debris formed by cracks from the separator 12, so as to reduce the risk of short circuit caused by the puncture of the separator 12 and improve safety.
  • the pole piece 11 includes a first pole piece 11a and a second pole piece 11b with opposite polarities, and each of the first pole piece 11a and the second pole piece 11b includes a plurality of bent portions 111 and a plurality of straight Section 112.
  • One of the first pole piece 11 a and the second pole piece 11 b is a positive pole piece, and the other is a negative pole piece.
  • the tensile strength of the first protective layer 15 is greater than that of the pole piece 11 .
  • Tensile strength can also be called tensile strength, which reflects the fracture resistance of the material. The ability of a material or specimen to resist fracture when it is subjected to static tension or the maximum tensile force (tensile stress) that the material can withstand without breaking.
  • the tensile strength of the first protective layer 15 can be detected according to the following method: cut a section of sample on the first protective layer 15, and measure the cross-sectional area S of the sample; fix the two ends of the sample on the tensile testing machine; Start the tensile testing machine, load at a constant speed, and record the maximum load F of the sample shear failure; calculate F/S, and the tensile strength of the first protective layer 15 can be measured.
  • the unit of tensile strength is N/m 2 .
  • the tensile strength of the pole piece 11 can also be detected according to the above method.
  • the first protective layer 15 has relatively high tensile strength, which can effectively increase the tensile capacity of the joint between the first bent portion 111a and the first straight portion 112a, and reduce the first The tensile deformation at the junction of the bent portion 111a and the first straight portion 112a reduces the risk of cracking of the pole piece 11 and improves safety.
  • the tensile strength of the first protective layer 15 is 50MPa-500MPa.
  • the tensile strength of the first protective layer 15 is 50MPa, 100MPa, 150MPa, 300MPa or 500MPa.
  • the hardness of the first protective layer 15 is greater than that of the spacer 12 .
  • the first protective layer 15 is less likely to be pierced by sharp structures such as burrs and debris than the separator 12.
  • the connection of the first protective layer 15 can also separate the sharp structure from the isolator 12, so as to reduce the risk of a short circuit caused by the puncture of the isolator 12 and improve safety.
  • the thickness of the first protection layer 15 is 1 ⁇ m-200 ⁇ m.
  • the inventor set the thickness of the first protective layer 15 to 1 ⁇ m-200 ⁇ m to balance the safety and energy density of the electrode assembly 10 .
  • the first protective layer 15 is bonded to the pole piece 11 .
  • Adhesion can ensure the connection strength between the first protective layer 15 and the pole piece 11 and simplify the assembly process of the first protective layer 15 and the pole piece 11 .
  • the first protective layer 15 may be adhesive tape or adhesive paper.
  • the first protective layer 15 is provided with a plurality of through-holes 151 through which the electrolyte passes, and the through-holes 151 are staggered from the junction of the first bent portion 111 a and the first straight portion 112 a.
  • the electrolyte can infiltrate the pole piece 11 through the through hole 151 to improve the performance of the pole piece 11 .
  • the connection between the through hole 151 and the first bent portion 111a and the first straight portion 112a is staggered so as to prevent the through hole 151 from exposing the sharp structure formed when the pole piece 11 is cracked, thereby improving safety.
  • the first protective layer 15 is attached to both sides of the junction of the first bent portion 111a and the first straight portion 112a.
  • the first protective layer 15 on the outer side of the connection between the first bent portion 111a and the first straight portion 112a can separate the connection from the casing, reducing the sharp structure formed by cracking of the pole piece 11 and the casing. Risk of Exposure.
  • the first protective layer 15 inside the junction of the first bent portion 111a and the first straight portion 112a can separate the junction from other bent portions 111, reducing the sharp structure formed by cracking of the pole piece 11 and other bent portions. Section 111 Exposure Risks.
  • one end of the first protective layer 15 is attached to the first bent portion 111a, and the other end of the first protective layer 15 is attached to the first straight portion 112a.
  • the size of the portion of the first protective layer 15 attached to the first bent portion 111a is L1
  • the size of the first bent portion 111a is L2
  • L1 and L2 satisfy : 0.01 ⁇ L1/L2 ⁇ 0.5.
  • the first pole piece 11a includes a first bent portion 111a and a first straight portion 112a.
  • L1 is the dimension of the part of the first protective layer 15 attached to the first bent portion 111a along the length direction of the first pole piece 11a
  • L2 is the dimension of the first pole piece 11a.
  • L1/L2 The smaller the value of L1/L2, the lower the connection strength between the first protective layer 15 and the first bent portion 111a, and the smaller the area that the first protective layer 15 can protect. If the value of L1/L2 is too small (for example, less than 0.01), when the pole piece 11 cracks, the crack may extend beyond the first protective layer 15 , thus causing a safety hazard.
  • the inventors set the value of L1/L2 at 0.01-0.5 after comprehensive consideration and experiments to ensure the safety and capacity of the electrode assembly 10 .
  • the value of L1/L2 is 0.01, 0.05, 0.1, 0.2 or 0.5.
  • the dimension of the portion of the first protective layer 15 attached to the first straight portion 112a is L3
  • the dimension of the first straight portion 112a is L4
  • L3 and L4 satisfy : 0.01 ⁇ L3/L4 ⁇ 0.2.
  • L3/L4 The smaller the value of L3/L4, the lower the connection strength between the first protective layer 15 and the first straight portion 112a, and the smaller the area that the first protective layer 15 can protect. If the value of L3/L4 is too small (for example, less than 0.01), when the pole piece 11 cracks, the crack may extend beyond the first protective layer 15, thereby causing a safety hazard.
  • the inventor set the value of L3/L4 at 0.01-0.2 after comprehensive consideration and experiments to ensure the safety and capacity of the electrode assembly 10 .
  • L3/L4 is 0.01, 0.03, 0.05, 0.1 or 0.2.
  • the first protective layer 15 covers at least the middle region of the connection.
  • the first pole piece 11a includes a first bent portion 111a and a first straight portion 112a. As shown in FIG. 7 , the axis Z is parallel to the width direction of the first pole piece 11 a after being flattened.
  • the middle region refers to a part of the region including the midpoint of the connection along the axial direction Z, and its range can be determined according to the specific size of the pole piece 11 along the axial direction Z.
  • the expansion deformation is the largest in the middle; correspondingly, the middle region of the junction of the first bent portion 111 a and the first straight portion 112 a is more likely to crack than the edge region. Therefore, the first protective layer 15 in this embodiment at least covers the middle region of the connection, so as to reduce the risk of cracking in the middle region of the connection.
  • the size of the first protective layer 15 is L5
  • the size of the pole piece 11 is L6, and L5 and L6 satisfy: L5/L6 ⁇ 0.2.
  • the value of L5/L6 the lower the connection strength between the first protective layer 15 and the pole piece 11, and the smaller the area that the first protective layer 15 can protect. If the value of L5/L6 is too small (for example, less than 0.2), when the pole piece 11 cracks, the crack may extend beyond the first protective layer 15, thereby causing a safety hazard. In this embodiment, the value of L5/L6 is set to be greater than or equal to 0.2, so as to reduce the risk of cracks extending outside the first protective layer 15, thereby improving safety.
  • the pole piece 11 includes a first pole piece 11a and a second pole piece 11b with opposite polarities, and each of the first pole piece 11a and the second pole piece 11b includes a plurality of bent portions 111 and a plurality of straight Section 112.
  • the outermost bent portion 111 of the first pole piece 11a is the first bent portion 111a.
  • the outermost bent portion 111 of the second pole piece 11b is the second bent portion 111b, and at least one straight portion 112 of the second pole piece 11b is the second straight portion 112b connected to the second bent portion 111b.
  • a second protective layer 16 is attached to the surface of the second pole piece 11b, and the second protective layer 16 covers at least part of the junction of the second bent portion 111b and the second straight portion 112b.
  • the second bent portion 111b is located inside the first bent portion 111a and adjacent to the first bent portion 111a
  • the second straight portion 112b is located inside the first straight portion 112a and adjacent to the first straight portion 112a.
  • the straight portions 112a are adjacently disposed.
  • the junction of the first bent portion 111a and the first straight portion 112a is the position where the first pole piece 11a is most likely to crack
  • the junction of the second bent portion 111b and the second straight portion 112b is the second pole piece 11b The most prone to cracking position.
  • the risk of cracking of the first pole piece 11 a and the risk of cracking of the second pole piece 11 b are reduced by providing the first protective layer 15 and the second protective layer 16 .
  • the first pole piece 11a is a negative pole piece
  • the second pole piece 11b is a positive pole piece
  • the outermost first pole piece 11 a is provided with four corner regions, and each corner region of the outermost first pole piece 11 a is provided with a first protective layer 15 .
  • the outermost second pole piece 11b is provided with four corner areas, and each corner area of the outermost second pole piece 11b is provided with a second protective layer 16 .
  • Fig. 8 is a schematic structural view of the first pole piece of the electrode assembly provided in other embodiments of the present application in an unfolded state.
  • the edge of the first protective layer 15 is flush with the edge of the pole piece.
  • the axis Z is parallel to the width direction of the first pole piece 11a after being flattened.
  • the first protective layer 15 can cover the crack, thereby reducing the Security Risk.
  • Fig. 9 is a schematic perspective view of the first pole piece of the electrode assembly provided in some other embodiments of the present application in an unfolded state.
  • the first protective layer 15 is attached to both sides of the junction of the first bent portion and the first straight portion.
  • the edges of the two first protective layers 15 located at the same end along the axial direction Z both exceed the pole piece and are connected to each other.
  • the two first protective layers 15 are connected to each other, which can reduce the risk of the first protective layer 15 falling off from the first pole piece 11 a and improve the reliability of the first protective layer 15 .
  • the two first protective layers 15 are formed independently and connected by bonding.
  • the two first protective layers 15 are integrally formed. At this time, the two first protective layers 15 have good integrity, which is convenient for manufacture and installation.
  • the two first protective layers 15 form a U-shaped structure.
  • Fig. 10 is a schematic perspective view of the first pole piece of the electrode assembly provided in some other embodiments of the present application in an unfolded state.
  • both edges of the first protective layer 15 in the axial direction Z are beyond the pole piece, and the two edges of one first protective layer 15 are connected to the two edges of the other first protective layer 15 .
  • the edges are connected separately.
  • the two first protective layers 15 are connected to form a ring structure around the junction of the first bent portion and the first straight portion, so as to further increase the strength of the pole piece at the junction and reduce the thickness of the pole piece. Risk of cracking.
  • the two first protective layers 15 are connected to each other, which can reduce the risk of the first protective layer 15 falling off from the pole piece and improve the reliability of the first protective layer 15.
  • the two first protective layers 15 are formed independently, and the two edges of one first protective layer 15 are respectively bonded to the two edges of the other first protective layer 15 .
  • the two first protective layers 15 are integrally formed.
  • one edge of one first protective layer 15 is integrally connected with one edge of another first protective layer 15, and the other edge of one first protective layer 15 is passed through another edge of another first protective layer 15. Adhesively connected.
  • Fig. 11 is a schematic structural diagram of the first protective layer of the electrode assembly provided by some embodiments of the present application
  • Fig. 12 is a partial schematic diagram of the electrode assembly provided by some embodiments of the present application.
  • the first protective layer 15 includes a base region 152 and two edge regions 153 , and the two edge regions 153 are respectively located at both ends of the base region 152 along the winding direction. In a direction away from the base region 152 , the thickness of the edge region 153 decreases.
  • the edge region 153 is thinned to reduce the stress concentration between the pole piece and the first protective layer 15 , and reduce the risk of the pole piece being cracked by the first protective layer 15 .
  • the surface of the edge region 153 facing away from the pole piece is an arc-shaped surface.
  • the arc-shaped surface is relatively smooth, which can better disperse stress, reduce stress concentration on the pole piece, and reduce the risk of cracking of the pole piece.
  • FIG. 13 is a schematic structural diagram of electrode assemblies provided by other embodiments of the present application.
  • multiple protective layers 17 are attached to the surface of the pole piece, and protective layers 17 are provided at the connection between each bent portion 111 and the corresponding straight portion 112 .
  • the protective layer 17 disposed at the junction of the first bent portion 111 a and the first straight portion 112 a is a first protective layer.
  • connection between the bent portion 111 and the straight portion 112 is a corner area, and the corner area is subjected to a greater force when the pole piece expands.
  • a protective layer 17 is provided in each corner area, so as to reduce the risk of pole piece cracking as much as possible and improve safety.
  • FIG. 14 is a schematic flowchart of a method for manufacturing a battery assembly provided by some embodiments of the present application.
  • the manufacturing method of the battery assembly of the embodiment of the present application includes:
  • the winding structure includes a bending area and a straight area connected to the bending area
  • the pole piece includes a plurality of bending parts located in the bending area and a plurality of straight parts located in the straight area
  • the bent part is the first bent part
  • at least one straight part on the outermost side of the pole piece is the first straight part connected to the first bent part
  • the first protective layer covers the first bent part and the first straight part. At least part of the junction of the parts.
  • Fig. 15 is a schematic block diagram of an electrode assembly manufacturing system provided by some embodiments of the present application.
  • the battery assembly manufacturing system 90 of the embodiment of the present application includes a first providing device 91 , a second providing device 92 and a winding device 93 .
  • the first providing device 91 is used for providing the pole piece, and attaching the first protection layer on the surface of the pole piece.
  • the second providing means 92 is used to provide spacers.
  • the winding device 93 winds the pole piece and the separator along the winding direction to form a winding structure.
  • the winding structure includes a bending area and a straight area connected to the bending area, and the pole piece includes a plurality of bending portions located in the bending area and a plurality of straight portions located in the straight area; the outermost bending portion of the pole piece The part is the first bent part, and at least one straight part on the outermost side of the pole piece is the first straight part connected to the first bent part; the first protective layer covers the first bent part and the first straight part at least part of the connection.

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

Abstract

Des modes de réalisation de la présente invention concernent un ensemble électrode et un procédé et un système de fabrication de celui-ci, et un élément de batterie, une batterie et un dispositif électrique. L'ensemble électrode de la présente invention comprend une plaque d'électrode et un séparateur, la plaque d'électrode et le séparateur étant enroulés dans une direction d'enroulement pour former une structure enroulée ; la structure enroulée comprend une région courbée et une région plate reliée à la région courbée ; et la plaque d'électrode comprend une pluralité de parties courbées situées dans la région courbée, et une pluralité de parties plates situées dans la région plate. La partie courbée la plus à l'extérieur de la plaque d'électrode est une première partie courbée, et au moins l'une des parties plates les plus à l'extérieur de la plaque d'électrode est une première partie plate connectée à la première partie courbée. Une première couche de protection est fixée à la surface de la plaque d'électrode, et recouvre au moins une partie de la connexion entre la première partie courbée et la première partie plate. La première couche de protection peut augmenter la résistance de la connexion entre la première partie courbée et la première partie plate, de façon à réduire le risque de fissuration de la plaque d'électrode au niveau de la connexion entre la première partie courbée et la première partie plate, ce qui permet d'améliorer la sécurité.
PCT/CN2022/070208 2022-01-05 2022-01-05 Ensemble électrode, cellule de batterie, batterie et dispositif électrique WO2023130237A1 (fr)

Priority Applications (2)

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CN202280021829.2A CN117015892A (zh) 2022-01-05 2022-01-05 电极组件、电池单体、电池以及用电装置
PCT/CN2022/070208 WO2023130237A1 (fr) 2022-01-05 2022-01-05 Ensemble électrode, cellule de batterie, batterie et dispositif électrique

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1604360A (zh) * 2003-09-30 2005-04-06 三洋电机株式会社 具有薄膜状外包装体的电池
CN1841834A (zh) * 2005-03-29 2006-10-04 三洋电机株式会社 涡旋式电极的角型电池
CN212810367U (zh) * 2020-08-21 2021-03-26 宁德时代新能源科技股份有限公司 电极组件、电池单体、电池和用电装置
CN112689921A (zh) * 2020-05-20 2021-04-20 宁德新能源科技有限公司 电极组件和电池
CN214477801U (zh) * 2021-03-26 2021-10-22 宁德新能源科技有限公司 一种电芯、电池包以及用电设备

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1604360A (zh) * 2003-09-30 2005-04-06 三洋电机株式会社 具有薄膜状外包装体的电池
CN1841834A (zh) * 2005-03-29 2006-10-04 三洋电机株式会社 涡旋式电极的角型电池
CN112689921A (zh) * 2020-05-20 2021-04-20 宁德新能源科技有限公司 电极组件和电池
CN212810367U (zh) * 2020-08-21 2021-03-26 宁德时代新能源科技股份有限公司 电极组件、电池单体、电池和用电装置
CN214477801U (zh) * 2021-03-26 2021-10-22 宁德新能源科技有限公司 一种电芯、电池包以及用电设备

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