WO2024164308A1 - 电极组件、电池单体、电池及用电装置 - Google Patents
电极组件、电池单体、电池及用电装置 Download PDFInfo
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- WO2024164308A1 WO2024164308A1 PCT/CN2023/075460 CN2023075460W WO2024164308A1 WO 2024164308 A1 WO2024164308 A1 WO 2024164308A1 CN 2023075460 W CN2023075460 W CN 2023075460W WO 2024164308 A1 WO2024164308 A1 WO 2024164308A1
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- WIPO (PCT)
- Prior art keywords
- pole ear
- pole
- foil
- electrode assembly
- ear portion
- Prior art date
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- Ceased
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Classifications
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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
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
- H01M50/533—Electrode connections inside a battery casing characterised by the shape of the leads or tabs
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/04—Construction or manufacture in general
- H01M10/0431—Cells with wound or folded electrodes
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
- H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
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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
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
- H01M50/536—Electrode connections inside a battery casing characterised by the method of fixing the leads to the electrodes, e.g. by welding
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
- H01M50/538—Connection of several leads or tabs of wound or folded electrode stacks
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2220/00—Batteries for particular applications
- H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
-
- 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 in particular to an electrode assembly, a battery cell, a battery and an electrical device.
- the battery includes a battery cell, and an electrode assembly is arranged in the shell of the battery cell. By connecting the electrode assembly and the shell, the input or output of the electric energy of the battery cell can be realized.
- the electrode assembly of the existing battery cells is often damaged during the production and assembly process, resulting in poor production quality of the battery cells, which is not conducive to improving the product qualification rate of the battery cells.
- the embodiments of the present application provide an electrode assembly, a battery cell, a battery and an electrical device, which can effectively improve the production quality of the battery cell.
- an embodiment of the present application provides an electrode assembly, comprising two pole pieces with opposite polarities and an isolating member for isolating the two pole pieces, wherein the two pole pieces and the isolating member are wound along a winding direction to form a main body and two pole ears; wherein the pole ears and the main body are arranged along the first direction, the pole ears comprise a plurality of pole ear portions arranged at intervals along the winding direction, the pole ear portions are bent relative to the first direction, at least a portion of the plurality of pole ear portions are stacked along the first direction, and a protrusion is formed on at least one side of the pole ear portion in its thickness direction.
- two pole pieces with opposite polarities and a separator are wound along a winding direction to form an electrode assembly of a wound structure, so that the electrode assembly has a main body and two pole ears, and the pole ears and the main body are arranged along a first direction.
- the pole ear is provided with a plurality of pole ear portions arranged at intervals along the winding direction, and the pole ear portion is bent relative to the first direction, so that at least a portion of the plurality of pole ear portions of the pole ear can be stacked along the first direction, and a protrusion is provided on at least one side of the pole ear portion of the pole ear to increase the thickness of the plurality of pole ear portions stacked together, and the phenomenon that the plurality of pole ear portions of the pole ear have a smaller local thickness after stacking can be alleviated, thereby improving the production quality of the pole ear, reducing the risk of the pole ear being welded through during the subsequent assembly process, thereby helping to reduce the phenomenon of damage to the electrode assembly, and helping to improve the connection stability and assembly quality between the electrode assembly and other components of the battery cell, so as to improve the production quality and use stability of the battery cell having such an electrode assembly.
- a plurality of protrusions are formed on at least one side of the pole lug portion.
- the pole ear portion is bent relative to the first direction and multiple pole ear portions are stacked along the first direction, so that the area with a cavity between two stacked and adjacent pole ear portions can be effectively increased, which is beneficial to further increase the overall thickness of the pole ear in the first direction, and can improve the uniformity of the thickness of the pole ear, thereby further alleviating the phenomenon of the pole ear being welded through during subsequent assembly and processing.
- the projection area of the pole ear portion is S 1
- the sum of the projection areas of the plurality of protrusions on the pole ear portion is S 2 , satisfying S 2 /S 1 ⁇ 0.5.
- the pole ear portion in the thickness direction of the pole ear portion by setting the sum of the projected areas of the multiple protrusions on the pole ear portion in the thickness direction of the pole ear portion to be greater than or equal to half of the projected area of the pole ear portion in the thickness direction of the pole ear portion, that is, the area occupied by the multiple protrusions on the pole ear portion is half or more of the pole ear portion, so that there is a sufficient area on the pole ear portion to be provided with the protrusions, so that after the multiple pole ear portions of the pole ear are stacked along the first direction, the pole ear has a sufficient thickness, and the uniformity of the thickness of the pole ear can be effectively improved, so as to reduce the risk of the pole ear being welded through during the subsequent assembly process.
- the pole ear portion includes a main body region that does not overlap with a projection of the protrusion in the thickness direction of the pole ear portion, and the protrusion protrudes from the main body region along the thickness direction of the pole ear portion; along the thickness direction of the pole ear portion, the maximum dimension of the pole ear portion is D 1 , and the thickness of the main body region is D 2 , satisfying 2 ⁇ D 1 /D 2 ⁇ 8.
- the pole ear portion has a main body area which does not overlap with the projection of the protrusion in the thickness direction of the pole ear portion, and the protrusion protrudes from the main body area in the thickness direction of the pole ear portion, that is, the main body area of the pole ear portion is an area of the pole ear portion where the protrusion is not arranged.
- the maximum dimension of the pole ear portion in the thickness direction of the pole ear portion is 2 to 8 times the thickness of the main body area, that is, the maximum thickness of the pole ear portion after the protrusion is arranged is 2 to 8 times the thickness of the main body area of the pole ear portion, so that after the pole ear portion is bent relative to the first direction, the thickness of multiple pole ear portions of the pole ear stacked on each other along the first direction can be effectively increased, so as to realize an increase in the thickness of the pole ear, and further can effectively alleviate the phenomenon of the pole ear being welded through during the subsequent assembly process.
- the pole ear portion is formed with a plurality of rows of protrusions, and each row of protrusions includes a plurality of the protrusions arranged at intervals.
- each row of protrusions includes multiple protrusions arranged at intervals, so that the multiple protrusions on the pole ear portion are arranged in an array, so that after the multiple pole ear portions of the pole ear are stacked along the first direction, the area with a cavity between two stacked and adjacent pole ear portions can be effectively increased, which is beneficial to further improve the overall thickness of the pole ear in the first direction, and can effectively improve the uniformity of the thickness of the pole ear, so as to reduce the phenomenon of the pole ear being welded through during the subsequent assembly process.
- the maximum dimension of the protrusion in a direction perpendicular to the thickness direction of the pole ear portion is W 1 , satisfying 0.3 mm ⁇ W 1 ⁇ 2 mm.
- the maximum dimension of the protrusion in a direction perpendicular to the thickness direction of the pole ear portion is 0.3 mm to 3 mm, that is, the maximum dimension of the protrusion in its radial direction is 0.3 mm to 3 mm, on the one hand, the phenomenon of excessive processing difficulty caused by the protrusion being too small can be alleviated, so as to reduce the processing difficulty of the pole ear portion; on the other hand, the phenomenon of the number of multiple protrusions on the pole ear portion being limited due to the protrusion being too large can be alleviated.
- the pole ear portion is formed with a plurality of protrusions arranged at intervals, and two ends of the protrusions extend to two ends of the pole ear portion respectively along a direction perpendicular to an arrangement direction of the plurality of protrusions.
- a plurality of protrusions are formed on the pole ear portion and arranged at intervals, and both ends of the protrusions extend to both ends of the pole ear portion, that is,
- the protrusion is a strip structure arranged on the pole ear portion, so as to realize a structure in which a plurality of protrusions are arranged on the pole ear portion.
- the use of such a structure is conducive to reducing the difficulty of arranging the protrusion on the pole ear portion, so as to improve the processing efficiency of the pole ear portion.
- the width of the protrusions is W 2 , satisfying 0.3 mm ⁇ W 2 ⁇ 2 mm.
- the width of the protrusion in the arrangement direction of the multiple protrusions to 0.3mm to 3mm, that is, the size of the protrusion in the direction perpendicular to the extension direction of the protrusion is 0.3mm to 3mm, on the one hand, it can alleviate the phenomenon of excessive processing difficulty caused by the protrusion width being too small, so as to reduce the processing difficulty of the pole ear part, and on the other hand, it can alleviate the phenomenon of the number of multiple protrusions on the pole ear part being limited due to the protrusion width being too large.
- the pole ear portion along the thickness direction of the pole ear portion, includes a plurality of foil materials stacked together, a convex portion is formed on one side of the foil material, and a concave portion is formed on the other side at a position corresponding to the convex portion, and in two adjacent foil materials, the convex portion of one foil material is accommodated in the concave portion of the other foil material; wherein, along the thickness direction of the pole ear portion, the convex portion located on one side of the pole ear portion is the protrusion.
- the pole ear portion is arranged as a structure in which multiple foils are stacked, and a convex portion is formed on one side of the foil and a concave portion is formed on the other side, so that after the multiple foils are stacked, the convex portions and the concave portions of two adjacent foils can be embedded in each other, so that a convex portion is formed on one side of the pole ear portion in the thickness direction of the pole ear portion.
- the pole ear portion adopting such a structure can effectively increase the thickness and structural strength of the pole ear portion itself, so that after the multiple pole ear portions of the pole ear are stacked along the first direction, the overall thickness and structural strength of the pole ear can be further increased, so as to further reduce the risk of the pole ear being welded through during the subsequent assembly process.
- a plurality of the foils are connected by welding to form the protrusions and the recesses on the foils.
- welding is used to connect multiple stacked foils, and convexities and concave portions are formed at the positions where the multiple foils are welded to each other.
- this is beneficial to improving the connection strength and connection stability between the multiple foils, and on the other hand, it is beneficial to reduce the processing difficulty of forming concave portions and convex portions on the foils, so as to optimize the production rhythm of the pole pieces, thereby effectively improving the production efficiency of the pole pieces.
- the pole piece includes a main body, a plurality of pole ear portions are connected to the main body, the main bodies of the two pole pieces and the isolation member are wound along the winding direction to form the main body, the main body includes a substrate and an active material layer arranged on at least one side of the substrate; the plurality of foil materials include a first foil material and a second foil material stacked together, the first foil material is connected to one end of the substrate in the first direction and is integrally formed with the substrate, and the second foil material is separately arranged from the substrate.
- the multiple foils include a first foil that is integrally formed with the substrate of the main body of the electrode piece.
- an area without an active material layer can be reserved on the substrate, so that the first foil can be arranged on the area, and then the second foil can be stacked on one side of the first foil, so that the first foil can provide a connection support point for the second foil, so as to achieve an increase in the thickness and structural strength of the electrode ear.
- a electrode piece with such a structure can effectively reduce the process difficulty of connecting the electrode ear to the substrate, which is beneficial to improving the production efficiency of the electrode assembly.
- the substrate includes a coating area and a spacing area, the coating area and the spacing area are arranged along the first direction, the active material layer is disposed in the coating area, and the spacing area connects the coating area and the first foil material.
- a coating area coated with an active material layer and a spacing area not coated with an active material layer are arranged on the substrate, so that the first foil of the pole ear portion can be connected to the coating area through the spacing area, so that the pole ear portion and the active material layer are spaced apart in the first direction.
- the electrode assembly adopting this structure can isolate the stress generated by the pole ear portion during the bending process relative to the first direction through the spacing area, so as to reduce the risk of fracture of the active material layer arranged on the coating area.
- the influence of the welding process on the active material layer can be reduced, thereby alleviating the phenomenon of damage to the active material layer, which is beneficial to improving the production quality of the electrode assembly.
- the thickness of the first foil is D 3
- the thickness of the second foil is D 4 , satisfying 0.5 ⁇ D 3 /D 4 ⁇ 2.
- the thickness of the first foil is 0.5 to 2 of the thickness of the second foil, that is, the thickness of the first foil is 0.5 to 2 times the thickness of the second foil, the phenomenon that the assembly difficulty of the first foil and the second foil is too great due to the large difference in thickness between the first foil and the second foil can be alleviated, so as to reduce the processing difficulty of the pole ear portion of this structure.
- the phenomenon that the second foil is damaged during the mutual welding process due to the thickness of the first foil being too large compared to the thickness of the second foil can be alleviated, and on the other hand, the phenomenon that the first foil is damaged during the mutual welding process due to the thickness of the second foil being too large compared to the thickness of the first foil can be alleviated.
- an end of the second foil material close to the substrate does not exceed an end of the first foil material connected to the substrate.
- the interference effect between the second foil material and the active material layer arranged on one side of the substrate can be effectively alleviated, thereby reducing the risk of the active material layer being damaged by the second foil material.
- a distance L between an end of the first foil away from the substrate and an end of the second foil away from the substrate satisfies L ⁇ 2 mm.
- the spacing between one end of the first foil away from the substrate and one end of the second foil away from the substrate in a direction perpendicular to the thickness direction of the pole ear portion is less than or equal to 2 mm, that is, the dimension of the end of the first foil away from the substrate exceeding the end of the second foil away from the substrate is less than or equal to 2 mm, or the dimension of the end of the second foil away from the substrate exceeding the end of the first foil away from the substrate is less than or equal to 2 mm, thereby alleviating the problem that the first foil exceeds the second foil too much or the second foil exceeds the first foil too much due to the length of the first foil or the length of the second foil being too large, thereby causing the pole ear portion to be lengthy or inverted into the electrode assembly, which is beneficial to improving the production quality and use reliability of the electrode assembly.
- the first foil and the second foil are made of the same material.
- the process difficulty of connecting the first foil and the second foil can be reduced.
- the pole piece includes a main body, a plurality of pole ears are connected to one end of the main body in the first direction, and the main bodies of the two pole pieces and the separator are wound along the winding direction to form the main body; wherein the main body includes a substrate and a The active material layer on at least one side of the substrate comprises a coating area and a spacing area, the coating area and the spacing area are arranged along the first direction, the active material layer is arranged in the coating area, and the spacing area connects the coating area and the pole ear portion.
- a coating area coated with an active material layer and a spacer area not coated with an active material layer are arranged on the substrate, so that the pole ear portion can be connected to the coating area through the spacer area, so that the pole ear portion and the active material layer are spaced apart in the first direction.
- the electrode assembly adopting this structure can isolate the stress generated by the pole ear portion during the bending process relative to the first direction through the spacer area, so as to reduce the risk of fracture of the active material layer arranged on the coating area.
- the impact on the active material layer caused by the welding process can be reduced, thereby alleviating the phenomenon of damage to the active material layer, which is beneficial to improving the production quality of the electrode assembly.
- the pole ear portion and the spacer region are integrally formed.
- the pole ear portion by setting the pole ear portion as a structure integrally formed with the spacer area of the substrate, the pole ear portion can be a part of the substrate during the actual production process. After reserving an area on the substrate where the active material layer is not set, the pole ear portion can be set on the area to reduce the process difficulty of connecting the pole ear portion to the substrate, which is beneficial to improving the production efficiency of the electrode assembly.
- a groove is formed on a side of the pole ear portion away from the protrusion and corresponding to a position of the protrusion.
- a groove is provided on the side of the pole ear portion away from the protrusion and at the position corresponding to the protrusion, so that the pole ear portion of this structure can be formed with a protrusion on the pole ear portion through a process such as stamping or rolling.
- it is beneficial to reduce the processing difficulty of the pole ear portion and to improve the processing efficiency of the pole ear portion.
- the protrusion of one pole lug portion and the groove of the other pole lug portion are staggered.
- the thickness of the tab is D 5 , satisfying 0.2 mm ⁇ D 5 ⁇ 2.5 mm.
- the thickness of the pole ear in the first direction to 0.2 mm to 2.5 mm
- the risk of the pole ear being welded through due to the small thickness of the pole ear can be alleviated, so as to reduce the risk of damage to the electrode assembly during subsequent assembly.
- the phenomenon of the pole ear occupying too much space due to the excessive thickness of the pole ear can be alleviated, which is beneficial to optimize the internal space of the battery cell with such an electrode assembly to improve the energy density of the battery cell.
- the two tabs are respectively disposed at two ends of the main body.
- the two pole ears of the electrode assembly are respectively formed at the two ends of the electrode assembly in the first direction, it is convenient to subsequently assemble the electrode assembly, which is beneficial to reduce the difficulty of assembling the battery cell with such an electrode assembly, and can reduce the interference or mutual contact between the two pole ears, thereby helping to reduce the risk of short circuit of the electrode assembly.
- the body is cylindrical.
- the main body of the electrode assembly is set to a cylindrical structure, so as to facilitate subsequent processing to form a battery cell with a cylindrical structure.
- an embodiment of the present application further provides a battery cell, comprising a housing and the above-mentioned electrode assembly; the electrode assembly is accommodated in the housing.
- the battery cell further includes a current collecting member; the current collecting member is disposed between the housing and the tab along the first direction, and the current collecting member connects the housing and the tab.
- a current collecting component is provided in the shell of the battery cell to connect the shell and the pole ear of the electrode assembly through the current collecting component, thereby realizing the input or output of electric energy of the battery cell.
- the current collecting member is connected to the tab by welding, and along the first direction, the thickness of the tab is D 5 , and the thickness of the current collecting member is D 6 , satisfying that D 6 ⁇ 1.5D 5 .
- the thickness of the current collecting component in the first direction is less than or equal to 1.5 times the thickness of the pole lug in the first direction, the phenomenon that the welding power required for welding the current collecting component and the pole lug is too large due to the thickness of the current collecting component being too large than the thickness of the pole lug can be alleviated, thereby effectively reducing the risk of the pole lug being welded through, thereby reducing the phenomenon of damage to the electrode assembly, which is beneficial to improving the production quality of battery cells.
- the current collecting member is connected to the electrode tab by welding to form a weld mark, and along the first direction, the weld mark covers the protrusion of at least one of the electrode tab portions.
- the weld mark formed by welding the current collecting member and the pole ear is set to cover the protrusion of at least one pole ear part in the first direction, that is, in the first direction, the position where the current collecting member and the pole ear are welded to each other is set corresponding to the protrusion of at least one pole ear part, so that the position where the current collecting member and the pole ear are welded to each other is located in the area where the pole ear is thickened by the protrusion, which is beneficial to further reduce the risk of the pole ear being welded through during the assembly process.
- an embodiment of the present application further provides a battery, comprising the above-mentioned battery cell.
- an embodiment of the present application further provides an electrical device, comprising the above-mentioned battery.
- FIG1 is a schematic diagram of the structure of a vehicle provided in some embodiments of the present application.
- FIG2 is an exploded view of a battery structure provided in some embodiments of the present application.
- FIG3 is an exploded view of a battery cell structure provided by some embodiments of the present application.
- FIG4 is a cross-sectional view of an electrode assembly provided in some embodiments of the present application.
- FIG5 is a cross-sectional view of an electrode assembly provided in some embodiments of the present application.
- FIG6 is a schematic diagram of the structure of an electrode assembly during a winding process provided by some embodiments of the present application.
- FIG. 7 is a schematic diagram of the structure of the electrode sheet of the electrode assembly provided in some embodiments of the present application after unfolding;
- FIG8 is a partial cross-sectional view of a pole piece after unfolding provided in some embodiments of the present application.
- FIG9 is a schematic diagram of the structure of a pole ear portion provided in some embodiments of the present application.
- FIG10 is a front view of a pole ear portion provided in some embodiments of the present application.
- FIG11 is a schematic diagram of the structure of the pole ear portion provided in some other embodiments of the present application.
- FIG12 is a front view of a pole ear portion provided in some other embodiments of the present application.
- FIG13 is a schematic diagram of the structure of the pole ear portion provided in some other embodiments of the present application.
- FIG14 is a front view of a pole ear portion provided in some other embodiments of the present application.
- FIG15 is a partial cross-sectional view of a pole piece after unfolding provided in some other embodiments of the present application.
- FIG16 is a cross-sectional view of a pole ear portion of a pole piece provided in some other embodiments of the present application.
- FIG. 17 is a cross-sectional view of a plurality of tab portions of an electrode tab of an electrode assembly provided in some embodiments of the present application after being stacked;
- FIG. 18 is a schematic diagram showing the connection between the current collecting member and the electrode lug of the electrode assembly provided in some embodiments of the present application.
- Icon 1000-vehicle; 100-battery; 10-box; 11-first box body; 12-second box body; 20-battery cell; 21-housing; 211-shell; 2111-opening; 212-end cover; 22-electrode assembly; 221-pole piece; 2211-main body; 22111-substrate; 22111a-coating area; 22111b-spacer area; 22112-active material layer; 2212-ear; 22121 -ear portion; 22121a-protrusion; 22121b-groove; 22121c-main body; 22121d-foil; 22121e-convex portion; 22121f-concave portion; 22121g-first foil; 22121h-second foil; 222-isolating member; 223-main body; 23-current collecting member; 24-weld stamp; 200-controller; 300-motor; X-first direction; Y-winding direction; Z-thickness direction of the ear portion.
- the terms “installed”, “connected”, “connected”, and “attached” should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements.
- installed should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements.
- a and/or B can represent: A exists alone, A and B exist at the same time, and B exists alone.
- the character "/" in this application generally indicates that the associated objects before and after are in an "or" relationship.
- the battery cell may be a secondary battery.
- a secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.
- the battery cell can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead storage battery, etc., which is not limited in the embodiments of the present application.
- a battery cell generally includes an electrode assembly.
- the electrode assembly includes a positive electrode, a negative electrode, and a separator.
- active ions such as lithium ions
- the separator is set between the positive electrode and the negative electrode to prevent the positive and negative electrodes from short-circuiting, while allowing active ions to pass through.
- the positive electrode may be a positive electrode sheet, and the positive electrode sheet may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.
- the positive electrode current collector has two surfaces facing each other in its thickness direction, and the positive electrode active material is disposed on either or both of the two facing surfaces of the positive electrode current collector.
- the positive electrode current collector may be a metal foil or a composite current collector.
- the metal foil aluminum or stainless steel, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel or titanium, etc., treated with silver surface, may be used.
- the composite current collector may include a polymer material base and a metal layer.
- the composite current collector may be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).
- the positive electrode active material may include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides, and their respective modified compounds.
- the present application is not limited to these materials, and other traditional materials that can be used as positive electrode active materials for batteries may also be used. These positive electrode active materials may be used alone or in combination of two or more.
- lithium-containing phosphates may include, but are not limited to, lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO4), a composite material of lithium manganese phosphate and carbon, lithium iron manganese phosphate, and at least one of a composite material of lithium iron manganese phosphate and carbon.
- the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.
- the negative electrode current collector can be a metal foil, a foamed metal or a composite current collector.
- a metal foil aluminum or stainless steel treated with silver, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel or titanium, etc. can be used.
- the foamed metal can be a foamed nickel, a foamed copper, a foamed aluminum, a foamed alloy, or a foamed carbon, etc.
- the composite current collector can include a polymer material base and a metal layer.
- the composite current collector can be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).
- a metal material copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.
- a polymer material substrate such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.
- the negative electrode sheet may include a negative electrode collector and a negative electrode active material disposed on at least one surface of the negative electrode collector.
- the negative electrode current collector has two surfaces facing each other in its thickness direction, and the negative electrode active material is disposed on either or both of the two facing surfaces of the negative electrode current collector.
- the negative electrode active material may be a negative electrode active material for a battery cell known in the art.
- the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, lithium titanate, etc.
- the material of the positive electrode current collector may be aluminum, and the material of the negative electrode current collector may be copper.
- the electrode assembly further includes a separator disposed between the positive electrode and the negative electrode.
- the separator is a separator.
- the present application has no particular limitation on the type of separator, and any known separator with a porous structure having good chemical stability and mechanical stability can be selected.
- the main material of the isolation membrane can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramics.
- the separator is a solid electrolyte, which is disposed between the positive electrode and the negative electrode and serves to transmit ions and isolate the positive and negative electrodes.
- the battery cell further includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes.
- an electrolyte which acts as a conductor of ions between the positive and negative electrodes.
- the present application has no specific restrictions on the type of electrolyte, which can be selected according to needs.
- the electrolyte can be liquid, gel or solid.
- the electrode assembly is a wound structure, wherein the positive electrode sheet and the negative electrode sheet are wound into the wound structure.
- the electrode assembly is a laminate structure.
- the shape of the electrode assembly can be cylindrical, flat, or polygonal.
- the electrode assembly is provided with tabs, which can lead current out of the electrode assembly.
- the tabs include a positive tab and a negative tab.
- the battery cell may include a housing.
- the housing is used to encapsulate components such as the electrode assembly and the electrolyte.
- the housing may be a steel housing, an aluminum housing, a plastic housing (such as polypropylene), a composite metal housing (such as a copper-aluminum composite housing), or an aluminum-plastic film.
- the battery cell can be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell or a battery cell of other shapes.
- the prismatic battery cell includes a square shell battery cell, a blade-shaped battery cell, a polygonal battery, such as a hexagonal battery, etc. There is no special limitation in this application.
- 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 may be a battery module.
- the multiple battery cells are arranged and fixed to form a battery module.
- the battery may be a battery pack, which includes a case and battery cells, wherein the battery cells or battery modules are accommodated in the case.
- the box body can be used as a part of the chassis structure of the vehicle.
- part of the box body can become at least a part of the floor of the vehicle, or part of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.
- the battery may be an energy storage device, which includes an energy storage container, an energy storage cabinet, and the like.
- Batteries have outstanding advantages such as high energy density, low environmental pollution, high power density, long service life, wide adaptability, and low self-discharge coefficient, and are an important part of the development of new energy today.
- a current collecting component is usually arranged in the shell of the battery cell.
- the pole ear of the electrode assembly needs to be welded to the current collecting component, and then connected to the shell through the current collecting component to realize the input or output of the electric energy of the battery cell, so as to facilitate the assembly of the battery cell and reduce the difficulty of assembling the battery cell.
- the electrode assembly is usually welded to the current collecting member through the pole ear to achieve electrical connection between the electrode assembly and the current collecting member, and the pole ear is usually formed by stacking multiple pole ear sheets.
- a flattening process or a smoothing process is usually used to flatten or smooth the multiple pole ear sheets of the pole sheet to improve the flatness of the pole ear, so that the pole ear is formed at one end of the electrode assembly, which is conducive to reducing the welding difficulty between the pole ear and the current collecting member.
- the pole ear of the existing electrode assembly is very likely to cause the pole ear to have a local thickness that is too small during the flattening or smoothing process, and it is easy to cause the overall thickness of the pole ear to be small after the multiple pole ear sheets are closely fitted, so that the pole ear is easily welded through during the welding process between the pole ear and the current collecting member, resulting in the risk of damage to the electrode assembly, thereby making the production quality of the battery cell poor, which is not conducive to improving the product qualification rate of the battery cell.
- an embodiment of the present application provides an electrode assembly, including two pole pieces with opposite polarities and an isolating member for isolating the two pole pieces, the two pole pieces and the isolating member are wound along a winding direction to form a main body and two pole ears; wherein the pole ears and the main body are arranged along a first direction, the pole ears include a plurality of pole ear portions arranged at intervals along the winding direction, the pole ear portions are bent relative to the first direction, at least parts of the plurality of pole ear portions are stacked along the first direction, and a protrusion is formed on at least one side of the pole ear portions in the thickness direction thereof.
- pole piece of this structure two pole pieces with opposite polarities and a separator are wound along a winding direction to form an electrode assembly of a wound structure, so that the electrode assembly has a main body and two pole ears, and the pole ears and the main body are arranged along a first direction.
- the pole ear is provided with a plurality of pole ear portions arranged at intervals along the winding direction, and the pole ear portion is bent relative to the first direction, so that at least a portion of the plurality of pole ear portions of the pole ear can be stacked along the first direction, and a protrusion is provided on at least one side of the pole ear portion of the pole ear to increase the thickness of the plurality of pole ear portions stacked together, and the phenomenon that the plurality of pole ear portions of the pole ear have a small local thickness after stacking can be alleviated, thereby improving the production quality of the pole ear, reducing the risk of the pole ear being welded through during the subsequent assembly process, thereby helping to reduce the phenomenon of damage to the electrode assembly, and helping to improve the connection stability and assembly quality between the electrode assembly and other components of the battery cell, so as to improve the production quality and use stability of the battery cell having such an electrode assembly.
- the pole piece disclosed in the embodiment of the present application can be used in, but not limited to, electric devices such as vehicles, ships or aircraft.
- a power supply system comprising the electrode assembly, battery cells or batteries disclosed in the present application can be used to form the electric device, so that the phenomenon of the pole ear of the electrode assembly being welded through during the production and assembly of the battery cell can be effectively alleviated, thereby improving the production quality of the battery cell.
- the embodiment of the present application provides an electric device using a battery as a power source
- the electric 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 car, a ship, a spacecraft, etc.
- the electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc.
- the spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.
- FIG. 1 is a schematic diagram of the structure of a vehicle 1000 provided in some embodiments of the present application.
- the vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc.
- a battery 100 is provided inside the vehicle 1000, and the battery 100 may be provided at the bottom of the vehicle 1000, or at the head of the vehicle 1000, or at the tail of the vehicle 1000.
- the battery 100 may be used to power the vehicle 1000, for example, the battery 100 may be used as an operating power source or a power source for the vehicle 1000, etc.
- the vehicle 1000 may also include a controller 200 and a motor 300, and the controller 200 is used to control the battery 100 to power the motor 300, for example, for the starting, navigation and working power requirements of the vehicle 1000 during driving.
- the battery 100 can not only serve as an operating power source or a use power source for the vehicle 1000, but also serve 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 may include a housing 10 and a battery cell 20, wherein the battery cell 20 is used to be accommodated in the housing 10.
- the box body 10 is used to provide an assembly space for the battery cell 20, and the box body 10 can adopt a variety of structures.
- the box body 10 may include a first box body 11 and a second box body 12, the first box body 11 and the second box body 12 cover each other, and the first box body 11 and the second box body 12 jointly define an assembly space for accommodating the battery cell 20.
- the second box body 12 can be a hollow structure with one end open, the first box body 11 can be a plate-like structure, and the first box body 11 covers the open side of the second box body 12, so that the first box body 11 and the second box body 12 jointly define an assembly space; the first box body 11 and the second box body 12 can also be hollow structures with one side open, and the open side of the first box body 11 covers the open side of the second box body 12.
- the box body 10 formed by the first box body 11 and the second box body 12 can be in a variety of shapes, such as a cylinder, a cuboid, etc. Exemplarily, in Figure 2, the shape of the box body 10 is a cuboid.
- the battery cell 20 disposed in the housing 10 may be one or more. When there are more than one battery cell 20 disposed in the housing 10, the multiple battery cells 20 may be connected in series, in parallel, or in a mixed connection.
- a mixed connection means that the multiple battery cells 20 are both connected in series and in parallel.
- the multiple battery cells 20 may be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by the multiple battery cells 20 may be accommodated in the housing 10; of course, the battery 100 may also be a battery module formed by connecting multiple battery cells 20 in series, in parallel, or in a mixed connection, and then the multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole, and accommodated in the housing 10.
- the battery 100 may also include other structures.
- the battery 100 may also include a busbar component, which is used to connect the multiple battery cells 20 to achieve electrical connection between 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 the battery cell 20 is not limited thereto.
- the battery cell 20 may be cylindrical, flat, rectangular or other shapes. For example, in FIG2 , the battery cell 20 is a cylindrical structure.
- Fig. 3 is an exploded view of a battery cell 20 provided in some embodiments of the present application.
- the battery cell 20 may include a housing 21 and an electrode assembly 22, wherein the electrode assembly 22 is accommodated in the housing 21.
- the housing 21 can also be used to contain electrolytes, such as electrolytes.
- the housing 21 can be in various structural forms, such as a cylinder, a cuboid, or a prism structure.
- the housing 21 can be made of various materials, such as copper, iron, aluminum, steel, or aluminum alloy.
- the housing 21 may include a shell 211 and an end cap 212, wherein a accommodating cavity is formed inside the shell 211, and the accommodating cavity has an opening 2111, and the accommodating cavity is used to accommodate the electrode assembly 22, that is, the shell 211 is a hollow structure with an opening 2111 on one side, and the end cap 212 covers the opening 2111 of the shell 211 and forms a sealed connection to form a sealed space for accommodating the electrode assembly 22 and the electrolyte.
- the electrode assembly 22 When assembling the battery cell 20 , the electrode assembly 22 may be placed in the housing 211 first, and the housing 211 may be filled with electrolyte. The end cap 212 may then be closed on the opening 2111 of the housing 211 to complete the assembly of the battery cell 20 .
- the shell 211 can be in various shapes, such as a cylinder, a cuboid, etc.
- the shape of the shell 211 can be determined according to the specific shape of the electrode assembly 22. For example, if the electrode assembly 22 is a cylindrical structure, a shell 211 with a cylindrical structure can be selected; if the electrode assembly 22 is a cuboid structure, a shell 211 with a cuboid structure can be selected.
- the end cap 212 can also be in various structures, such as the end cap 212 being a plate-like structure, a hollow structure with an opening 2111 at one end, etc.
- the electrode assembly 22 is a cylindrical structure, and correspondingly, the shell 211 is a cylindrical structure, the end cap 212 is a cylindrical plate-like structure, and the end cap 212 covers the opening 2111 of the shell 211.
- the outer shell 21 is not limited to the above structure, and the outer shell 21 may also be other structures.
- the outer shell 21 includes a shell body 211 and two end caps 212.
- the shell body 211 is a hollow structure with openings 2111 on opposite sides.
- One end cap 212 corresponds to an opening 2111 of the shell body 211 and forms a sealed connection to form a sealed space for accommodating the electrode assembly 22 and the electrolyte.
- the housing 21 may further include a positive electrode terminal and a negative electrode terminal.
- the positive electrode terminal may be mounted on the end cap 212, and the negative electrode terminal may be mounted on the end of the housing 211 opposite to the end cap 212.
- the positive electrode terminal may be mounted on the end of the housing 211 opposite to the end cap 212, and the negative electrode terminal may be mounted on the end cap 212.
- the positive electrode terminal and the negative electrode terminal may be mounted on the end cap 212 or both of them may be mounted on the end of the housing 211 opposite to the end cap 212.
- the positive electrode terminal and the negative electrode terminal are both used to electrically connect to the electrode assembly 22 to achieve the input or output of the electric energy of the battery cell 20.
- the positive electrode terminal and the negative electrode terminal may be directly connected to the electrode assembly 22, such as welding or abutting, etc., and the positive electrode terminal and the negative electrode terminal may also be indirectly connected to the electrode assembly 22, such as the positive electrode terminal and the negative electrode terminal are first connected to other components, and then abutted or welded to the electrode assembly 22 through other components.
- the battery cell 20 may further include a current collecting member 23 , which is accommodated in the housing 21 , and is used to connect the electrode assembly 22 and the positive electrode terminal or the negative electrode terminal of the housing 21 to realize the input or output of electrical energy of the battery cell 20 .
- the current collecting component 23 serves to connect the electrode assembly 22 and the positive electrode terminal of the outer shell 21 or to connect the electrode assembly 22 and the negative electrode terminal of the outer shell 21. There are many ways to connect the current collecting component 23 with the electrode assembly 22 and the positive electrode terminal or the negative electrode terminal of the outer shell 21, such as welding, abutment or bonding.
- the battery cell 20 may include two current collecting components 23, and the electrode assembly 22 is respectively connected to the positive electrode terminal and the negative electrode terminal of the outer shell 21 through the two current collecting components 23, that is, the electrode assembly 22 is connected to the positive electrode terminal of the outer shell 21 through one current collecting component 23, and is connected to the negative electrode terminal of the outer shell 21 through another current collecting component 23, so that the positive and negative electrodes of the battery cell 20 can be output or input respectively.
- the battery cell 20 may further include a pressure relief mechanism, which may be installed on the end cover 212 or the housing 211. Similarly, there may be one or more pressure relief mechanisms, which are used to release the pressure inside the battery cell 20.
- the pressure relief mechanism may be a pressure relief component such as an explosion-proof valve, an explosion-proof disk, an air valve, a pressure relief valve or a safety valve.
- the electrode assembly 22 is a component in the battery cell 20 where an electrochemical reaction occurs.
- the electrode assembly 22 may have a variety of structures, for example, the electrode assembly 22 may be a winding structure formed by winding, or a laminated structure formed by stacking.
- the electrode assembly 22 may have a variety of shapes, for example, the electrode assembly 22 may be a cylindrical structure, an elliptical structure, or a rectangular parallelepiped structure.
- Fig. 4 is a cross-sectional view of an electrode assembly 22 provided in some embodiments of the present application
- Fig. 5 is a cross-sectional view of an electrode assembly 22 provided in some embodiments of the present application.
- the electrode assembly 22 is a wound structure formed by winding, and the shape of the electrode assembly 22 is a cylinder.
- the electrode assembly 22 may include two pole pieces 221 with opposite polarities, and the two pole pieces 221 are wound around a central axis extending along the first direction X to form an electrode assembly 22 with a wound structure. That is, the two pole pieces 221 with opposite polarities are respectively the positive pole piece and the negative pole piece of the electrode assembly 22, and the positive pole piece and the negative pole piece are wound to form the electrode assembly 22 with a wound structure.
- the electrode assembly 22 may also be a laminated structure formed by stacking two pole pieces 221 with opposite polarities.
- the electrode assembly 22 may further include an isolating member 222 , which is disposed between the two pole pieces 221 to insulate and isolate the two pole pieces 221 , thereby effectively reducing the risk of short circuit of the electrode assembly 22 during use.
- an isolating member 222 which is disposed between the two pole pieces 221 to insulate and isolate the two pole pieces 221 , thereby effectively reducing the risk of short circuit of the electrode assembly 22 during use.
- the material of the isolation member 222 may be various, for example, the material of the isolation member 222 may be polypropylene or polyethylene.
- Figure 6 is a schematic diagram of the structure of the electrode assembly 22 provided in some embodiments of the present application during the winding process
- Figure 7 is a schematic diagram of the structure of the pole piece 221 of the electrode assembly 22 provided in some embodiments of the present application after unfolding
- Figure 8 is a partial cross-sectional view of the pole piece 221 provided in some embodiments of the present application after unfolding.
- the present application provides an electrode assembly 22, including two pole pieces 221 with opposite polarities and an isolating member 222 for isolating the two pole pieces 221, and the two pole pieces 221 and the isolating member 222 are wound along the winding direction Y to form a main body 223 and two pole ears 2212.
- the pole ear 2212 and the main body 223 are arranged along the first direction X, and the pole ear 2212 includes a plurality of pole ear portions 22121 arranged at intervals along the winding direction Y, the pole ear portions 22121 are bent relative to the first direction X, at least a portion of the plurality of pole ear portions 22121 are stacked along the first direction X, and a protrusion 22121a is formed on at least one side of the pole ear portion 22121 in its thickness direction.
- the pole piece 221 may include a main body 2211 and a pole ear 2212 connected to one end of the main body 2211 in the first direction X, and the main bodies 2211 and the isolation members 222 of the two pole pieces 221 with opposite polarities are wound along the winding direction Y to form the main body 223 of the electrode assembly 22, and the winding center axis of the electrode assembly 22 extends along the first direction X, so that the pole ear 2212 of each pole piece 221 is formed at one end of the electrode assembly 22 in the first direction X, thereby making the pole ear 2212 and the main body 223 arranged along the first direction X.
- the two pole pieces 221 with opposite polarities each have a pole ear 2212
- the two pole ears 2212 have opposite polarities
- the two pole ears 2212 are located at two ends of the main body 223 in the first direction X, respectively.
- the main body 2211 of the pole piece 221 is the area where the pole piece 221 undergoes chemical reactions in the battery cell 20, and mainly relies on the movement of metal ions between the main bodies 2211 of the two pole pieces 221 with opposite polarities to work.
- the main body 2211 of the pole piece 221 includes a substrate 22111 and an active material layer 22112 disposed on one side of the substrate 22111, and the pole ear 2212 is connected to one end of the substrate 22111 along the first direction X.
- the active material layer 22112 is used to perform chemical reactions in the battery cell 20 during the use of the battery cell 20.
- the pole ear portion 22121 is bent relative to the first direction X, that is, when the pole piece 221 is not wound to form the electrode assembly 22 and is in an unfolded state, the pole ear portion 22121 is a structure extending along the first direction X. After the pole piece 221 is wound to form the electrode assembly 22, the pole ear portion 22121 needs to be bent so that the pole ear portion 22121 is set at a non-zero angle with the first direction X, so that at least a part of the pole ear portions 22121 among the multiple pole ear portions 22121 can be stacked on each other along the first direction X to form a pole ear 2212.
- the multiple pole ear portions 22121 of the pole ear 2212 can be processed by smoothing or kneading processes, so that the pole ear portion 22121 is bent relative to the first direction X, and at least a portion of the multiple pole ear portions 22121 is stacked along the first direction X.
- the thickness direction Z of the pole ear portion can be the same as the first direction X, or can be set at a smaller angle to the first direction X, for example, The angle between the thickness direction Z of the pole ear portion and the first direction X is less than or equal to 10°.
- the thickness direction Z of the pole ear portion is the same as the first direction X.
- the extension direction of the main body 2211 of the pole piece 221 is the winding direction Y, so that the multiple pole ear portions 22121 of the pole ear 2212 are arranged at intervals along the extension direction of the main body 2211.
- the first direction X, the extension direction of the main body 2211 and the thickness direction Z of the pole ear portion are mutually perpendicular structures.
- the thickness direction of the substrate 22111 is the same as the thickness direction Z of the pole ear portion.
- the substrate 22111 and the tab 2212 may be an integral structure or a split structure. If the substrate 22111 and the tab 2212 are an integral structure, the multiple tab portions 22121 of the tab 2212 may be formed at one end of the substrate 22111 in the first direction X by cutting or the like; if the substrate 22111 and the tab 2212 are a split structure, the tab 2212 may be connected to one end of the substrate 22111 in the first direction X by welding or clamping or the like, wherein in the embodiment where the substrate 22111 and the tab 2212 are a split structure, the material of the substrate 22111 may be the same as the material of the tab 2212, or may be different from the material of the tab 2212.
- the pole ear 2212 of the pole piece 221 is a component of the pole piece 221 for outputting or inputting electric energy of the pole piece 221.
- the pole ear 2212 includes a plurality of pole ear portions 22121 spaced apart along the winding direction Y, so that after the pole piece 221 is wound to form the electrode assembly 22, it is convenient to process the plurality of pole ear portions 22121 of the pole ear 2212 by smoothing or kneading, etc., so that the plurality of pole ear portions 22121 of the pole ear 2212 can be stacked and formed at one end of the electrode assembly 22 in the first direction X, so that the positive or negative electrode of the electrode assembly 22 can be output or input after the pole ear 2212 is connected to the current collecting component 23.
- the pole ear 2212 includes a plurality of pole ear portions 22121 spaced apart along the winding direction Y, that is, after the pole piece 221 is unfolded, as shown in FIG7 , the plurality of pole ear portions 22121 of the pole ear 2212 are spaced apart along the extension direction of the main body portion 2211; when the pole piece 221 is wound along the winding direction Y to form the electrode assembly 22, the extension direction of the main body portion 2211 is the same as the winding direction Y, and the plurality of pole ear portions 22121 are spaced apart along the winding direction Y.
- At least a portion of the multiple pole ear portions 22121 are stacked along the first direction X, that is, after the multiple pole ear portions 22121 of the pole ear 2212 are bent relative to the first direction X through smoothing or kneading processes, some of the pole ear portions 22121 may be stacked along the first direction X, or all of the pole ear portions 22121 may be stacked along the first direction X.
- the extension direction of the main body 2211 is the winding direction Y, so that the multiple pole ear portions 22121 of the pole ear 2212 are arranged at intervals along the winding direction of the pole piece 221, so that when the pole ear 2212 undergoes a smoothing or kneading process, the multiple pole ear portions 22121 of the pole ear 2212 are smoothed from the outer edge of the electrode assembly 22 toward the direction of the central axis of the electrode assembly 22, so that the multiple pole ear portions 22121 of the pole ear 2212 are a structure in which a part of the pole ear portions 22121 and a part of the pole ear portions 22121 are stacked along the first direction X, and another part is stacked along the first direction X with another part of the pole ear portions 22121.
- the pole ear 2212 can also be a structure in which the multiple pole ear portions 22121 are
- a protrusion 22121a is formed on at least one side of the pole ear portion 22121 in the thickness direction thereof, that is, in the thickness direction Z of the pole ear portion, the pole ear portion 22121 may be provided with the protrusion 22121a on only one side, or may be provided with the protrusion 22121a on both sides of the pole ear portion 22121.
- the number of protrusions 22121a provided on the pole ear portion 22121 may be one or more.
- the protrusion 22121a is provided on only one side of the pole ear portion 22121, and the number of the protrusions 22121a is more than one.
- the protrusion 22121a on the pole ear portion 22121 there are multiple processing methods for forming the protrusion 22121a on the pole ear portion 22121, for example, adding material on one side of the pole ear portion 22121 by welding or extrusion molding to form the protrusion 22121a on one side of the pole ear portion 22121, or pressing or rolling the protrusion 22121a on one side of the pole ear portion 22121, and forming a groove 22121b on the side of the pole ear portion 22121 away from the protrusion 22121a and corresponding to the protrusion 22121a.
- the protrusion 22121a is formed on one side of the pole ear portion 22121 by stamping or rolling, so that the pole ear portion 22121 is formed with a groove 22121b on the side away from the protrusion 22121a and corresponding to the protrusion 22121a.
- the two pole pieces 221 with opposite polarities and the separator 222 are wound along the winding direction Y to form a wound electrode assembly 22, so that the electrode assembly 22 has a main body 223 and two pole tabs 2212, and the pole tabs 2212 and the main body 223 are arranged along the first direction X.
- the pole lug 2212 is provided with a plurality of pole lug portions 22121 arranged at intervals along the winding direction Y, and the pole lug portion 22121 is bent relative to the first direction X, so that at least a portion of the plurality of pole lug portions 22121 of the pole lug 2212 can be stacked along the first direction X, and a protrusion 22121a is provided on at least one side of the pole lug portion 22121 of the pole lug 2212 to increase the thickness of the plurality of pole lug portions 22121 stacked together, and the phenomenon that the plurality of pole lug portions 22121 of the pole lug have a smaller local thickness after stacking can be alleviated, thereby improving the production quality of the pole lug 2212, reducing the risk of the pole lug 2212 being welded through during subsequent assembly processing, thereby helping to reduce the phenomenon of damage to the electrode assembly 22, and helping to improve the connection stability and assembly quality between the electrode assembly 22 and other components of the battery cell 20, so as to improve the production quality and use
- Figure 9 is a schematic structural diagram of the pole ear portion 22121 provided in some embodiments of the present application
- Figure 10 is a front view of the pole ear portion 22121 provided in some embodiments of the present application.
- at least one side of the pole ear portion 22121 is formed with a plurality of protrusions 22121a.
- multiple protrusions 22121a are formed on at least one side of the pole ear 22121, that is, in the thickness direction Z of the pole ear 22121, the pole ear 22121 can be provided with multiple protrusions 22121a only on one side, or multiple protrusions 22121a can be provided on both sides of the pole ear 22121.
- a plurality of protrusions 22121a are provided on only one side of the pole ear 22121.
- a plurality of protrusions 22121a are provided on only one side of the pole ear 22121.
- the area with a cavity between two stacked and adjacent pole ear portions 22121 can be effectively increased, which is beneficial to further increase the overall thickness of the pole ear 2212 in the first direction X, and can improve the uniformity of the thickness of the pole ear 2212, thereby further alleviating the phenomenon of the pole ear 2212 being welded through during subsequent assembly and processing.
- the projection area of the pole ear portion 22121 is S 1
- the sum of the projection areas of the plurality of protrusions 22121a on the pole ear portion 22121 is S 2 , satisfying S 2 /S 1 ⁇ 0.5.
- the projection area of the pole ear portion 22121 along the thickness direction Z of the pole ear portion is S 1 , that is, the area of the region defined by the projection of the pole ear portion 22121 along the thickness direction Z of the pole ear portion is S 1 .
- the sum of the projection areas of the plurality of protrusions 22121a on the pole ear 22121 along the thickness direction Z of the pole ear is S 2 , that is, the sum of the areas defined by the projections of each protrusion 22121a in the thickness direction Z of the pole ear is S 2 .
- S2 is the sum of the projection areas of the multiple protrusions 22121a on the thickness direction Z of the pole ear; if there are multiple protrusions 22121a on both sides of the pole ear 22121, S2 is the sum of the projection areas of the multiple protrusions 22121a on both sides of the pole ear 22121 on the thickness direction Z of the pole ear.
- the sum S2 of the projected areas of the plurality of protrusions 22121a on the pole ear portion 22121 may be 0.5 times, 0.55 times, 0.58 times, 0.6 times, 0.65 times, 0.7 times, 0.8 times, etc., of the projected area S1 of the pole ear portion 22121 .
- S1 and S2 that is, when measuring the projection area S1 of the pole ear 22121 and the sum of the projection areas S2 of the multiple protrusions 22121a on the pole ear 22121, it is necessary to first unfold the pole piece 221 and then measure (as shown in Figure 7) to obtain S1 and S2 , that is, S1 is the projection plane of the pole ear 22121 in the thickness direction Z of the pole ear when the pole piece 221 is in the unfolded state, and S2 is the sum of the projection areas of the multiple protrusions 22121a on the pole ear 22121 in the thickness direction Z of the pole ear when the pole piece 221 is in the unfolded state.
- the area occupied by the multiple protrusions 22121a on the pole ear portion 22121 is half or more of the pole ear portion 22121, so that there is a sufficient area on the pole ear portion 22121 to be provided with the protrusions 22121a, so that after the multiple pole ear portions 22121 of the pole ear 2212 are stacked along the first direction X, the pole ear 2212 has a sufficient thickness, and the uniformity of the thickness of the pole ear 2212 can be effectively improved, so as to reduce the risk of the pole ear 2212 being welded through during the subsequent assembly process.
- the pole ear portion 22121 includes a main body region 22121c that does not overlap with the projection of the protrusion 22121a in the thickness direction Z of the pole ear portion, and the protrusion 22121a protrudes from the main body region 22121c along the thickness direction Z of the pole ear portion.
- the maximum dimension of the pole ear portion 22121 is D 1
- the thickness of the main body region 22121c is D 2 , satisfying 2 ⁇ D 1 /D 2 ⁇ 8.
- the pole ear portion 22121 includes a main body area 22121c which does not overlap with the projection of the protrusion 22121a in the thickness direction Z of the pole ear portion, that is, the area of the pole ear portion 22121 where the protrusion 22121a is not formed is the main body area 22121c, so that the projection of the main body area 22121c in the thickness direction Z of the pole ear portion and the projection of the protrusion 22121a in the thickness direction Z of the pole ear portion do not intersect with each other, that is to say, the protrusion 22121a protrudes from one side of the main body portion 2211 in the thickness direction Z of the pole ear portion.
- the maximum dimension of the pole ear portion 22121 is D 1 , and the thickness of the main area 22121c is D 2 , satisfying 2 ⁇ D 1 /D 2 ⁇ 8, that is, the maximum thickness of the pole ear portion 22121 in its thickness direction is 2 to 8 times the wall thickness of the main area 22121c itself, that is, the maximum thickness of the pole ear portion 22121 after the protrusion 22121a is formed by a process such as stamping or rolling is 2 to 8 times the thickness of the pole ear portion 22121 before the stamping or rolling process is performed.
- the maximum dimension D1 of the ear portion 22121 may be 2 times, 2.5 times, 2.8 times, 3 times, 3.5 times, 4 times, 5 times, 6 times, 8 times, etc., of the thickness D2 of the main body region 22121c.
- the pole piece 221 is a positive pole piece
- the pole ear 2212 corresponding to the pole piece 221 is a positive pole ear
- the thickness of the pole ear portion 22121 of the positive pole ear before stamping or rolling to form the protrusion 22121a is 10 ⁇ m-16 ⁇ m
- the pole piece 221 is a negative pole piece
- the pole ear 2212 corresponding to the pole piece 221 is a negative pole ear
- the thickness of the pole ear portion 22121 of the negative pole ear before stamping or rolling to form the protrusion 22121a is 4 ⁇ m-10 ⁇ m.
- the pole ear portion 22121 has a main body area 22121c which does not overlap with the projection of the protrusion 22121a in the thickness direction Z of the pole ear portion, and the protrusion 22121a protrudes from the main body area 22121c in the thickness direction Z of the pole ear portion, that is, the main body area 22121c of the pole ear portion 22121 is an area of the pole ear portion 22121 where the protrusion 22121a is not provided, by setting the maximum size of the pole ear portion 22121 in the thickness direction Z of the pole ear portion to twice the thickness of the main body area 22121c To 8 times, that is, the maximum thickness of the pole ear portion 22121 after being provided with the protrusion 22121a is 2 times to 8 times the thickness of the main area 22121c of the pole ear portion 22121, so that after the pole ear portion 22121 is bent relative to the first direction X, the thickness of the multiple pole ear portions 22121 of the pole ear 2212 stacked on each other along the first direction X can
- the pole ear portion 22121 is formed with a plurality of rows of protrusions 22121 a , and each row of protrusions 22121 a includes a plurality of protrusions 22121 a arranged at intervals.
- the pole ear portion 22121 is formed with multiple rows of protrusions 22121a, and each row of protrusions 22121a includes multiple protrusions 22121a arranged at intervals, that is, the multiple protrusions 22121a on the pole ear portion 22121 are arranged in an array, so that the multiple protrusions 22121a are arranged in multiple rows and columns.
- the multiple protrusions 22121a in each row can be arranged at intervals along the first direction X, or can be arranged at intervals along the winding direction Y (the extension direction of the main body 2211).
- the shape of the protrusion 22121a can be various.
- the protrusion 22121a is a hemispherical structure.
- Figure 11 is a schematic diagram of the structure of the pole ear portion 22121 provided in some other embodiments of the present application
- Figure 12 is a front view of the pole ear portion 22121 provided in some other embodiments of the present application.
- the protrusion 22121a can also be a square columnar structure.
- the structure of the protrusion 22121a is not limited to this.
- the protrusion 22121a can also be a cylindrical structure, a triangular columnar structure, a pentagonal columnar structure, etc.
- each row of protrusions 22121a includes multiple protrusions 22121a arranged at intervals, so that the multiple protrusions 22121a on the pole ear portion 22121 are arranged in an array, so that after the multiple pole ear portions 22121 of the pole ear 2212 are stacked along the first direction X, the area with a cavity between two stacked and adjacent pole ear portions 22121 can be effectively increased, which is beneficial to further improve the overall thickness of the pole ear 2212 in the first direction X, and can effectively improve the uniformity of the thickness of the pole ear 2212, so as to reduce the phenomenon of the pole ear 2212 being welded through during the subsequent assembly process.
- the maximum dimension of the protrusion 22121 a in a direction perpendicular to the thickness direction Z of the pole ear portion is W 1 , satisfying 0.3 mm ⁇ W 1 ⁇ 2 mm.
- the maximum dimension of the protrusion 22121a in a direction perpendicular to the thickness direction Z of the pole ear portion is W 1 , that is, in any direction in a plane perpendicular to the thickness direction Z of the pole ear portion, the maximum width of the protrusion 22121a is W 1 , that is, in a plane perpendicular to the thickness direction Z of the pole ear portion, the maximum width of the protrusion 22121a in its radial direction is W 1 .
- W 1 is the diameter of the protrusion 22121a; if the protrusion 22121a is a square columnar structure, W 1 is the length of the diagonal line of the protrusion 22121a.
- the maximum dimension W1 of the protrusion 22121a in a direction perpendicular to the thickness direction Z of the pole ear portion may be 0.3 mm, 0.5 mm, 0.8 mm, 1 mm, 1.2 mm, 1.5 mm or 2 mm, etc.
- the maximum dimension of the protrusion 22121a in the direction perpendicular to the thickness direction Z of the pole ear portion is 0.3 mm to 3 mm, that is, the maximum dimension of the protrusion 22121a in its radial direction is 0.3 mm to 3 mm
- the phenomenon of excessive processing difficulty caused by the small size of the protrusion 22121a can be alleviated, so as to reduce the processing difficulty of the pole ear portion 22121; on the other hand, the phenomenon of the number of multiple protrusions 22121a on the pole ear portion 22121 being limited due to the large size of the protrusion 22121a can be alleviated.
- the use of this structure can effectively alleviate the phenomenon that the protrusion 22121a and the groove 22121b of two adjacent pole ear portions 22121 of the pole ear 2212 overlap and offset each other after the multiple pole ear portions 22121 of the pole ear 2212 are stacked on each other due to the excessive size of the protrusion 22121, thereby providing a cavity between the two stacked and adjacent pole ear portions 22121 to increase the overall thickness of the pole ear 2212.
- Figure 13 is a schematic diagram of the structure of the pole ear portion 22121 provided in some other embodiments of the present application
- Figure 14 is a front view of the pole ear portion 22121 provided in some other embodiments of the present application.
- the pole ear portion 22121 is formed with a plurality of protrusions 22121a arranged at intervals, and the two ends of the protrusion 22121a extend to the two ends of the pole ear portion 22121 along a direction perpendicular to the arrangement direction of the plurality of protrusions 22121a.
- the arrangement direction of the plurality of protrusions 22121 a refers to a direction in which the plurality of protrusions 22121 a are arranged in sequence and at intervals in a plane perpendicular to the thickness direction Z of the pole ear portion.
- the two ends of the protrusion 22121a extend to the two ends of the pole ear portion 22121 along a direction perpendicular to the arrangement direction of the multiple protrusions 22121a, that is, the protrusion 22121a is a strip structure, and the two ends of the protrusion 22121a extend to the two ends of the pole ear portion 22121 along a direction perpendicular to the arrangement direction of the multiple protrusions 22121a, so that the multiple protrusions 22121a are arranged in a spaced arrangement along the width direction of the protrusion 22121a.
- the extension direction of the protrusion 22121a of the strip structure can be along the first direction X, or along the winding direction Y (the extension direction of the main body 2211).
- the protrusion 22121a is a strip-shaped structure with a rectangular cross-section.
- the protrusion 22121a may also be a strip-shaped structure with a semicircular, pentagonal, or other cross-section.
- a structure in which a plurality of protrusions 22121a are arranged on the pole ear portion 22121 is realized.
- the use of such a structure is beneficial to reducing the difficulty of arranging the protrusions 22121a on the pole ear portion 22121, so as to improve the processing efficiency of the pole ear portion 22121.
- the width of the protrusions 22121 a is W 2 , satisfying 0.3 mm ⁇ W 2 ⁇ 2 mm.
- the width of the protrusion 22121a is W 2 , that is, in the arrangement direction of the plurality of protrusions 22121a , the maximum size of the protrusion 22121a is W 2 .
- the width W2 of the protrusion 22121a may be 0.3 mm, 0.5 mm, 0.8 mm, 1 mm, 1.2 mm, 1.5 mm or 2 mm, etc.
- the width of the protrusion 22121a in the arrangement direction of the multiple protrusions 22121a is 0.3mm to 3mm, that is, the size of the protrusion 22121a in the direction perpendicular to the extension direction of the protrusion 22121a is 0.3mm to 3mm, on the one hand, the phenomenon of excessive processing difficulty caused by the small width of the protrusion 22121a can be alleviated, so as to reduce the processing difficulty of the pole ear portion 22121; on the other hand, the phenomenon of limited number of multiple protrusions 22121a on the pole ear portion 22121 caused by the excessive width of the protrusion 22121a can be alleviated.
- the use of this structure can effectively alleviate the phenomenon that the protrusion 22121a and the groove 22121b of two adjacent pole ear portions 22121 of the pole ear 2212 overlap and offset each other after the multiple pole ear portions 22121 of the pole ear 2212 are stacked on each other due to the excessive width of the protrusion 22121a, thereby allowing a cavity to exist between the two stacked and adjacent pole ear portions 22121, so as to meet the requirement that the pole ear 2212 has sufficient thickness after being smoothed.
- FIG. 15 is a partial cross-sectional view of a pole piece 221 provided in other embodiments of the present application after unfolding
- FIG. 16 is a cross-sectional view of a pole ear portion 22121 of a pole piece 221 provided in other embodiments of the present application.
- the pole ear portion 22121 may include a plurality of foils 22121d arranged in a stacked manner, a convex portion 22121e is formed on one side of the foil 22121d, and a concave portion 22121f is formed at a position corresponding to the convex portion 22121e on the other side.
- the convex portion 22121e of one foil 22121d is accommodated in the concave portion 22121f of the other foil 22121d.
- the convex portion 22121e located on one side of the pole ear portion 22121 is a protrusion 22121a.
- the pole ear portion 22121 includes a plurality of foils 22121d stacked, that is, the pole ear portion 22121 is composed of a plurality of foils 22121d, and the plurality of foils 22121d are stacked along the thickness direction Z of the pole ear portion to form the pole ear portion 22121 of the pole ear 2212.
- the pole ear portion 22121 may include two foils 22121d, one of the two foils 22121d is connected to the main body 2211, and the other foil 22121d is stacked on one side of the foil 22121d connected to the main body 2211 along the thickness direction Z of the pole ear portion.
- the pole ear portion 22121 may be formed by stacking three, four, five or six foils 22121d. It should be noted that, in some embodiments, the pole ear portion 22121 may also include only one foil material 22121d.
- a convex portion 22121e is formed on one side of the foil 22121d, and a concave portion 22121f is formed on the other side at a position corresponding to the convex portion 22121e. That is, in the thickness direction Z of the pole ear portion, a convex portion 22121e protruding from the foil 22121d is formed on one side of the foil 22121d, and a concave portion 22121f is formed on the other side at a position corresponding to the convex portion 22121e, so that the convex portion 22121e and the concave portion 22121f are arranged one by one in the thickness direction Z of the pole ear portion.
- the convex portion 22121e of one foil 22121d is accommodated in the concave portion 22121f of the other foil 22121d, that is, along the thickness direction Z of the pole ear portion, in the two stacked and adjacent foils 22121d, the convex portion 22121e of one foil 22121d and the concave portion 22121b of the other foil 22121d are arranged in a one-to-one correspondence, so that the convex portion 22121e of one foil 22121d can be embedded in the concave portion 22121b of the other foil 22121d, so that the two foils 22121d can fit tightly.
- the convex portion 22121e located on one side of the pole ear portion 22121 is the protrusion 22121a, that is, the convex portion 22121e of the foil 22121d located on one side among the multiple foils 22121d of the pole ear portion 22121 is the protrusion 22121a on one side of the pole ear portion 22121, and correspondingly, the concave portion 22121f of the foil 22121d located on the other side among the multiple foils 22121d of the pole ear portion 22121 is the groove 22121b on the other side of the pole ear portion 22121.
- the plurality of foils 22121d of the pole ear portion 22121 may be connected in various ways, such as snap-on, adhesive or welding.
- the pole ear portion 22121 is configured as a structure in which a plurality of foils 22121d are stacked, and a convex portion 22121e is formed on one side of the foil 22121d, and a concave portion 22121f is formed on the other side, so that after the plurality of foils 22121d are stacked, the convex portions 22121e and the concave portions 22121f of two adjacent foils 22121d are 22121f can be embedded in each other to achieve the formation of a protrusion 22121a on one side of the pole ear portion 22121 in the thickness direction Z of the pole ear portion.
- the pole ear portion 22121 adopting this structure can effectively increase the thickness and structural strength of the pole ear portion 22121 itself, so that after the multiple pole ear portions 22121 of the pole ear 2212 are stacked along the first direction X, the overall thickness and structural strength of the pole ear 2212 can be further increased, so as to further reduce the risk of the pole ear 2212 being welded through during the subsequent assembly process.
- a plurality of foils 22121d are welded to form a convex portion 22121e and a concave portion 22121f on the foil 22121d. That is, the convex portion 22121e and the concave portion 22121f are formed correspondingly at the positions where the plurality of foils 22121d are welded to each other, that is, the convex portion 22121e and the concave portion 22121f on the foil 22121d are structures formed by welding the plurality of foils 22121d.
- the plurality of foils 22121d are connected by ultrasonic roller welding to form convex portions 22121e and concave portions 22121f at the positions where the foils 22121d are welded.
- the specific connection method of ultrasonic roller welding can be found in the relevant technology and will not be described in detail here.
- Welding is used to connect multiple stacked foils 22121d, and protrusions 22121e and recesses 22121f are formed at positions where the multiple foils 22121d are welded to each other. This is beneficial to improving the connection strength and stability between the multiple foils 22121d on one hand, and beneficial to reducing the processing difficulty of forming the recesses 22121f and protrusions 22121e on the foil 22121d on the other hand, so as to optimize the production rhythm of the pole piece 221, thereby effectively improving the production efficiency of the pole piece 221.
- the pole piece 221 may include a main body 2211, a plurality of pole ears 22121 connected to the main body 2211, and the main bodies 2211 and the separators 222 of the two pole pieces 221 are wound along the winding direction Y to form a main body 223.
- the main body 2211 includes a substrate 22111 and an active material layer 22112 disposed on at least one side of the substrate 22111.
- the plurality of foils 22121d may include a first foil 22121g and a second foil 22121h that are stacked, the first foil 22121g being connected to one end of the substrate 22111 in the first direction X and being integrally formed with the substrate 22111, and the second foil 22121h being separately disposed from the substrate 22111.
- multiple pole ear portions 22121 of the pole ear 2212 are connected to one end of the main body 2211 in the first direction X.
- the pole piece 221 When the pole piece 221 is in an unfolded state, the pole ear 2212 and the main body 2211 are arranged along the first direction X, and the multiple pole ear portions 22121 of the pole ear 2212 are arranged at intervals along the extension direction of the main body 2211; after the pole piece 221 is wound to form the electrode assembly 22, and the pole ear portion 22121 is bent relative to the first direction X, the multiple pole ear portions 22121 of the pole ear 2212 are arranged at intervals along the winding direction Y, and the pole ear portion 22121 is connected to one end of the main body 2211 in the first direction X, and is arranged at a non-zero angle with the main body 2211.
- An active material layer 22112 is disposed on at least one side of the substrate 22111. That is, the substrate 22111 may be disposed with an active material layer 22112 on only one side, or may be disposed with an active material layer 22112 on both sides of the substrate 22111. For example, in FIG15 , an active material layer 22112 is disposed on both sides of the substrate 22111.
- the active material layer 22112 is the area where chemical reactions occur in the battery cell 20, and mainly relies on the movement of metal ions between the active material layers 22112 of the two pole pieces 221 to work.
- the substrate 22111 may also be coated with an insulating protective layer, and the insulating protective layer is arranged at one end or both ends of the active material layer 22112 along the first direction X to protect and separate the active material layer 22112.
- the insulating protective layer may not be arranged at one end of the active material layer 22112 in the first direction X, that is, only the active material layer 22112 is coated on the substrate 22111.
- the material of the active material layer 22112 of the main body 2211 corresponding to the electrode 221 may be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganese oxide, etc.; if the electrode 221 is a negative electrode, the material of the active material layer 22112 of the main body 2211 corresponding to the electrode 221 may be carbon or silicon, etc.
- the first foil material 22121g is connected to one end of the substrate 22111 in the first direction X, and is formed integrally with the substrate 22111, that is, the first foil material 22121g is connected to the substrate 22111, and the first foil material 22121g is a structure formed by cutting and processing on the substrate 22111.
- the first foil material 22121g and the substrate 22111 may also be a split structure, for example, the first foil material 22121g is connected to one end of the substrate 22111 in the first direction X by welding or the like, and similarly, the first foil material 22121g and the substrate 22111 may also be indirectly connected, for example, the first foil material 22121g and the substrate 22111 are indirectly connected through other conductive components.
- one end of the first foil 22121g in a direction perpendicular to the thickness direction Z of the electrode ear portion is connected to one end of the substrate 22111 in the first direction X.
- the thickness direction Z of the pole ear portion and the first direction X are perpendicular to each other. Then, one end of the first foil 22121g in a direction perpendicular to the thickness direction Z of the pole ear portion is connected to one end of the substrate 22111 in the first direction X, that is, one end of the first foil 22121g in the first direction X is connected to one end of the substrate 22111 in the first direction X (see Figure 15).
- the second foil material 22121h is separately provided from the substrate 22111, that is, the second foil material 22121h and the substrate 22111 are two independent parts.
- the second foil material 22121h is stacked and connected to the first foil material 22121g on one side of the thickness direction Z of the pole ear portion.
- the first foil material 22121g may be provided with the second foil material 22121h only on one side, or may be provided with the second foil material 22121h on both sides, and the number of the second foil material 22121h provided on one side of the first foil material 22121g may be one or more.
- the multiple foils 22121d include a first foil 22121g integrally formed with the substrate 22111 of the main body 2211 of the electrode piece 221.
- an area without an active material layer 22112 may be reserved on the substrate 22111, so that the first foil 22121g can be set on the area, and then the second foil 22121h can be stacked on one side of the first foil 22121g, so that the first foil 22121g can provide a connection support point for the second foil 22121h, so as to achieve an increase in the thickness and structural strength of the pole ear portion 22121.
- the pole piece 221 with such a structure can effectively reduce the process difficulty of connecting the pole ear portion 22121 to the substrate 22111, which is beneficial to improving the production efficiency of the electrode assembly 22.
- the substrate 22111 includes a coating area 22111a and a spacer area 22111b, the coating area 22111a and the spacer area 22111b are arranged along a first direction X, the active material layer 22112 is disposed in the coating area 22111a, and the spacer area 22111b connects the coating area 22111a and the first foil material 22121g.
- the spacer area 22111b of the substrate 22111 is an area on the substrate 22111 that is not coated with the active material layer 22112.
- the coating area 22111a and the spacer area 22111b are arranged along the first direction X, and the spacer area 22111b connects the coating area 22111a and the first foil 22121g. That is, when the electrode 221 is unfolded Finally, in the first direction X, the spacing area 22111b is connected between the coating area 22111a and the first foil 22121g.
- the spacer 22111b is a blank area on the substrate 22111.
- the spacer 22111b on the substrate 22111 that is not coated with the active material layer 22112 may also be coated with an insulating protective layer, etc., to protect the active material layer 22112.
- the substrate 22111 of the main body 2211 may not be provided with the spacer 22111b, that is, the first foil material 22121g is directly connected to the coating area 22111a of the substrate 22111, that is, the active material layer 22112 completely covers one side of the substrate 22111, so that the first foil material 22121g is connected to one end of the substrate 22111.
- the first foil 22121g of the pole ear 22121 can be connected to the coating area 22111a through the spacer area 22111b, so that the pole ear 22121 and the active material layer 22112 are spaced apart in the first direction X.
- the electrode assembly 22 with such a structure can, on the one hand, isolate the stress generated during the bending process of the pole ear 22121 relative to the first direction X through the spacer area 22111b, so as to reduce the risk of fracture of the active material layer 22112 arranged on the coating area 22111a.
- the influence of the welding process on the active material layer 22112 can be reduced, thereby alleviating the phenomenon of damage to the active material layer 22112, which is beneficial to improving the production quality of the electrode assembly 22.
- the thickness of the first foil 22121g is D 3
- the thickness of the second foil 22121h is D 4 , satisfying 0.5 ⁇ D 3 /D 4 ⁇ 2.
- the thickness D3 of the first foil 22121g is the wall thickness of the first foil 22121g itself, that is, the thickness D3 of the first foil 22121g is the thickness of the area of the first foil 22121g where the protrusion 22121e and the recess 22121f are not formed, that is, the thickness D3 of the first foil 22121g is the thickness of the first foil 22121g before the protrusion 22121e and the recess 22121f are formed.
- the thickness D4 of the second foil 22121h is the wall thickness of the second foil 22121h itself, that is, the thickness D4 of the second foil 22121h is the thickness of the area of the first foil 22121g where the protrusions 22121e and the recesses 22121f are not formed, that is, the thickness D4 of the second foil 22121h is the thickness of the second foil 22121h before the protrusions 22121e and the recesses 22121f are formed.
- the thickness D 3 of the first foil 22121 g may be 0.5 times, 0.6 times, 0.75 times, 0.8 times, 1 times, 1.2 times, 1.5 times, 2 times, etc., of the thickness D 4 of the second foil 22121 h .
- a first foil 22121g with a thickness of 12 ⁇ m was selected for the experiment, and the thickness of the second foil 22121h was set to different sizes for the experiment, so as to measure the influence of the thickness ratio of the first foil 22121g to the second foil 22121h on the mutual welding assembly of the first foil 22121g and the second foil 22121h under different conditions.
- the experimental results are as follows:
- the ratio of the thickness D3 of the first foil 22121g to the thickness D4 of the second foil 22121h is set to be less than or equal to 2.
- the ratio of the thickness D3 of the first foil 22121g to the thickness D4 of the second foil 22121h is set to be greater than or equal to 0.5.
- the thickness of the first foil 22121g is 0.5 to 2 of the thickness of the second foil 22121h, that is, the thickness of the first foil 22121g is 0.5 to 2 times the thickness of the second foil 22121h, the problem of the difficulty of assembling the first foil 22121g and the second foil 22121h being too difficult due to the large difference between the thickness of the first foil 22121g and the thickness of the second foil 22121h can be alleviated, so as to reduce the difficulty of processing the pole ear portion 22121 of this structure.
- the problem of the second foil 22121h being damaged during the mutual welding process due to the thickness of the first foil 22121g being too large compared to the thickness of the second foil 22121h can be alleviated
- the problem of the first foil 22121g being damaged during the mutual welding process due to the thickness of the second foil 22121h being too large compared to the thickness of the first foil 22121g can be alleviated.
- the end of the second foil 22121h close to the substrate 22111 does not exceed the end of the first foil 22121g connected to the substrate 22111. It should be noted that when the pole piece 221 is in an unfolded state, in the first direction X, the end of the second foil 22121h close to the substrate 22111 does not exceed the end of the first foil 22121g connected to the substrate 22111.
- the end of the second foil 22121h close to the substrate 22111 does not exceed the end of the first foil 22121g connected to the substrate 22111. That is, the end of the first foil 22121g connected to the substrate 22111 may be flush with the second foil 22121h, or may extend out of the second foil.
- the first foil 22121 g is connected to one end of the substrate 22111 and extends out from the second foil 22121 h to one end of the substrate 22111 .
- the second foil 22121h is an end close to the substrate 22111 in the first direction X and does not exceed the end of the first foil 22121g connected to the substrate 22111 in the first direction X. If the pole piece 221 is wound to form the electrode assembly 22, and the multiple pole ear portions 22121 of the pole ear are flattened or kneaded and stacked on one end of the electrode assembly 22, the second foil 22121h is perpendicular to the first direction X and points to the end of the first foil 22121g connected to the substrate 22111 along the end of the first foil 22121g away from the substrate 22111 and does not exceed the end of the first foil 22121g connected to the substrate 22111.
- the interference effect between the second foil 22121h and the active material layer 22112 arranged on one side of the substrate 22111 can be effectively alleviated, thereby reducing the risk of the active material layer 22112 being damaged by the second foil 22121h.
- the distance between the end of the first foil 22121g away from the substrate 22111 and the end of the second foil 22121h away from the substrate 22111 is L, satisfying that L ⁇ 2mm. It should be noted that when the pole piece 221 is in the unfolded state, L is the distance between the end of the first foil 22121g away from the substrate 22111 and the end of the second foil 22121h away from the substrate 22111 in the first direction X.
- the distance between one end of the first foil 22121g away from the substrate 22111 and one end of the second foil 22121h away from the substrate 22111 is L, that is, one end of the first foil 22121g away from the substrate 22111 and one end of the second foil 22121h away from the substrate 22111 can be flush with each other or staggered with each other. If the end of the first foil 22121g away from the substrate 22111 and the end of the second foil 22121h away from the substrate 22111 are staggered, then the distance between the end of the first foil 22121g away from the substrate 22111 and the end of the second foil 22121h away from the substrate 22111 is less than or equal to 2 mm.
- the distance between the end of the first foil 22121g away from the substrate 22111 and the end of the second foil 22121h away from the substrate 22111 is L, and the end of the first foil 22121g away from the substrate 22111 may exceed the end of the second foil 22121h away from the substrate 22111, and the dimension of the first foil 22121g exceeding the second foil 22121h is less than or equal to 2mm; or the end of the second foil 22121h away from the substrate 22111 exceeds the end of the first foil 22121g away from the substrate 22111, and the dimension of the second foil 22121h exceeding the first foil 22121g is less than or equal to 2mm.
- L can be 0mm, 0.2mm, 0.5mm, 1mm, 1.5mm or 2mm, etc.
- one end of the first foil 22121g away from the substrate 22111 exceeds one end of the second foil 22121h away from the substrate 22111, and a size L is defined as the portion of the first foil 22121g that exceeds the second foil 22121h.
- the distance between the end of the first foil 22121g away from the substrate 22111 and the end of the second foil 22121h away from the substrate 22111 in the direction perpendicular to the thickness direction Z of the pole ear portion is less than or equal to 2 mm, that is, the dimension of the end of the first foil 22121g away from the substrate 22111 exceeding the end of the second foil 22121h away from the substrate 22111 by less than or equal to 2 mm, or the end of the second foil 22121h away from the substrate 22111 exceeding the first foil 22121g by less than or equal to 2 mm.
- the dimension of the end of the foil 22121g away from the substrate 22111 is less than or equal to 2 mm, thereby alleviating the phenomenon that the first foil 22121g exceeds the second foil 22121h too much or the second foil 22121h exceeds the first foil too much due to the length of the first foil 22121g or the length of the second foil 22121h being too large, resulting in the ear portion 22121 being too long or being inverted into the electrode assembly 22, which is beneficial to improving the production quality and reliability of the electrode assembly 22.
- the first foil 22121g and the second foil 22121h are made of the same material. In other words, the first foil 22121g and the second foil 22121h are made of the same material.
- the material of the first foil 22121g and the material of the second foil 22121h can be various, for example, copper, iron, aluminum, steel, aluminum alloy, etc.
- the process difficulty of connecting the first foil 22121g and the second foil 22121h can be reduced.
- the main body 2211 includes a substrate 22111 and an active material layer 22112 disposed on at least one side of the substrate 22111, the substrate 22111 includes a coating area 22111a and a spacing area 22111b, the coating area 22111a and the spacing area 22111b are arranged along the first direction X, the active material layer 22112 is disposed in the coating area 22111a, and the spacing area 22111b connects the coating area 22111a and the pole ear portion 22121.
- multiple pole ear portions 22121 of the pole ear 2212 are connected to one end of the main body 2211 in the first direction X.
- the pole piece 221 When the pole piece 221 is in an unfolded state, the pole ear 2212 and the main body 2211 are arranged along the first direction X, and the multiple pole ear portions 22121 of the pole ear 2212 are arranged at intervals along the extension direction of the main body 2211; after the pole piece 221 is wound to form the electrode assembly 22, and the pole ear portion 22121 is bent relative to the first direction X, the multiple pole ear portions 22121 of the pole ear 2212 are arranged at intervals along the winding direction Y, and the pole ear portion 22121 is connected to one end of the main body 2211 in the first direction X, and is arranged at a non-zero angle with the main body 2211.
- An active material layer 22112 is disposed on at least one side of the substrate 22111, that is, the substrate 22111 may be provided with an active material layer 22112 on one side or on both sides.
- active material layers 22112 are disposed on both sides of the substrate 22111.
- the spacer 22111b of the substrate 22111 is an area on the substrate 22111 that is not coated with the active material layer 22112.
- the coating area 22111a and the spacer 22111b are arranged along the first direction X, and the spacer 22111b connects the coating area 22111a and the pole ear portion 22121, that is, in the first direction X, the spacer 22111b is connected between the coating area 22111a and the pole ear portion 22121.
- the pole ear portion 22121 may be a structure including only one foil material 22121d, or the pole ear portion 22121 may be a structure including a plurality of foil materials 22121d stacked.
- the spacer 22111b is a blank area on the substrate 22111. It should be noted that, in some embodiments, the spacer 22111b on the substrate 22111 that is not coated with the active material layer 22112 may also be coated with an insulating protective layer, etc., to protect the active material layer 22112. Of course, in other embodiments, the spacer 22111b may not be provided on the substrate 22111 of the main body 2211, that is, the pole ear 22121 is directly connected to the coating area 22111a of the substrate 22111, that is, the active material layer 22112 completely covers one side of the substrate 22111, so that the pole ear 22121 is connected to one end of the substrate 22111.
- the pole ear portion 22121 can be connected to the coating area 22111a through the spacer area 22111b, so that the pole ear portion 22121 and the active material layer 22112 are spaced apart in the first direction X.
- the electrode assembly 22 with such a structure can, on the one hand, isolate the stress generated during the bending process of the pole ear portion 22121 relative to the first direction X through the spacer area 22111b, so as to reduce the risk of fracture of the active material layer 22112 arranged on the coating area 22111a.
- the influence of the welding process on the active material layer 22112 can be reduced, thereby alleviating the phenomenon of damage to the active material layer 22112, which is beneficial to improving the production quality of the electrode assembly 22.
- the pole ear portion 22121 and the spacer region 22111 b are integrally formed.
- the pole ear portion 22121 and the spacer 22111b are integrally formed, that is, the pole ear portion 22121 includes only one foil material 22121d, and the pole ear portion 22121 is a structure formed by cutting and processing on the substrate 22111.
- the pole ear portion 22121 and the substrate 22111 may also be a split structure, for example, the pole ear portion 22121 is connected to one end of the substrate 22111 in the first direction X by welding or the like.
- the pole ear portion 22121 may also be a structure integrally formed with the substrate 22111, that is, the pole ear portion 22121 is integrally formed with the coating area 22111a of the substrate 22111.
- the pole ear portion 22121 By setting the pole ear portion 22121 as a structure that is integrally formed with the spacer area 22111b of the substrate 22111, the pole ear portion 22121 can be a part of the substrate 22111 during the actual production process. After reserving an area on the substrate 22111 where the active material layer 22112 is not set, the pole ear portion 22121 can be set in the area, thereby reducing the process difficulty of connecting the pole ear portion 22121 to the substrate 22111, which is beneficial to improving the production efficiency of the electrode assembly 22.
- a groove 22121 b is formed on a side of the pole ear portion 22121 away from the protrusion 22121 a and corresponding to the position of the protrusion 22121 a .
- a groove 22121b is formed on the side of the pole ear portion 22121 away from the protrusion 22121a and corresponding to the position of the protrusion 22121a. That is to say, a protrusion 22121a is formed on one side of the pole ear portion 22121, and a groove 22121b is formed on the other side corresponding to the position of the protrusion 22121a, so that the protrusion 22121a and the groove 22121b are arranged one by one in the thickness direction Z of the pole ear portion.
- the ear portion 22121 of this structure may be processed in a variety of ways, such as stamping or rolling.
- the pole ear 22121 of this structure can be formed with the protrusion 22121a on the pole ear 22121 through a process such as stamping or rolling.
- a process such as stamping or rolling.
- it is beneficial to reduce the processing difficulty of the pole ear 22121 and to improve the processing efficiency of the pole ear 22121.
- FIG17 is a cross-sectional view of a plurality of pole ear portions 22121 of a pole ear 2212 of an electrode assembly 22 provided in some embodiments of the present application after being stacked.
- the protrusion 22121a of one pole ear portion 22121 is staggered with the groove 22121b of the other pole ear portion 22121.
- the protrusion 22121a of one pole ear portion 22121 and the groove 22121b of the other pole ear portion 22121 are staggered, that is, in two adjacent pole ear portions 22121, the protrusion 22121a of one pole ear portion 22121 and the groove 22121b of the other pole ear portion 22121 are not aligned in the first direction X.
- the protrusion 22121a of one pole ear portion 22121 and the groove 22121b of the other pole ear portion 22121 in two adjacent pole ear portions 22121 in the first direction X as mutually staggered structures, the phenomenon of mutual offsetting of the protrusion 22121a and the groove 22121b after overlapping can be effectively alleviated, so that the pole ear 2212 has sufficient thickness in the first direction X, which is beneficial to reduce the risk of the pole ear 2212 of the electrode assembly 22 being welded through during the subsequent assembly process.
- the thickness of the tab 2212 is D 5 , satisfying 0.2 mm ⁇ D 5 ⁇ 2.5 mm.
- the thickness of the tab 2212 is D 5 , that is, after the multiple tab portions 22121 of the tab 2212 are bent relative to the first direction X and stacked on one end of the main body 223 of the electrode assembly 22 in the first direction X through smoothing or kneading processes, the size of the tab 2212 in the first direction X is D 5 .
- the thickness D5 of the tab 2212 may be 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.8 mm, 1 mm, 1.5 mm, 2 mm, or 2.5 mm, etc.
- the thickness of the pole lug 2212 in the first direction X is set to 0.2 mm to 2.5 mm, on the one hand, the risk of the pole lug 2212 being welded through due to the pole lug 2212 being too thin can be alleviated, thereby reducing the risk of the electrode assembly 22 being damaged during subsequent assembly.
- the phenomenon of the pole lug 2212 occupying too much space due to the pole lug 2212 being too thick can be alleviated, which is beneficial for optimizing the internal space of the battery cell 20 having such an electrode assembly 22, thereby improving the energy density of the battery cell 20.
- two electrode tabs 2212 are respectively disposed at two ends of the main body 223 of the electrode assembly 22 .
- the polarities of the two pole pieces 221 are opposite, that is, the two pole pieces 221 are respectively the positive pole piece and the negative pole piece of the electrode assembly 22 .
- the two pole ears 2212 are respectively arranged at the two ends of the main body 223 of the electrode assembly 22, that is, the pole ears 2212 of the two pole pieces 221 with opposite polarities are respectively formed at the two ends of the electrode assembly 22 in the first direction X, so that the positive pole ear and the negative pole ear are respectively formed at the two ends of the electrode assembly 22 in the first direction X to output or input the positive and negative poles of the electrode assembly 22.
- the electrode assembly 22 By respectively arranging the two pole ears 2212 of the electrode assembly 22 at the two ends of the main body 223 of the electrode assembly 22 in the first direction X, so that the two pole ears 2212 are respectively formed at the two ends of the electrode assembly 22 in the first direction X, it is convenient to assemble the electrode assembly 22 later, which is beneficial to reduce the difficulty of assembling the battery cell 20 with such an electrode assembly 22, and can reduce the interference or mutual contact between the two pole ears 2212, thereby helping to reduce the risk of short circuit of the electrode assembly 22.
- the main body 223 of the electrode assembly 22 is cylindrical.
- the structure of the main body 223 of the electrode assembly 22 is not limited thereto.
- the main body 223 of the electrode assembly 22 may also be a columnar structure with an elliptical cross section.
- the electrode assembly 22 is arranged in a cylindrical structure, so that the battery cell 20 with a cylindrical structure can be formed in the subsequent processing.
- the present application also provides a battery cell 20, including a housing 21 and a The electrode assembly 22 of any of the above solutions is accommodated in the housing 21.
- the housing 21 may include a shell 211 and an end cover 212 .
- the shell 211 is a hollow structure with an opening 2111 on one side.
- the end cover 212 closes the opening 2111 of the shell 211 to form a sealed space for accommodating the electrode assembly 22 .
- the shell 211 may be in various shapes, such as a cylinder, a cuboid, etc.
- the shape of the shell 211 may be determined according to the specific shape of the electrode assembly 22.
- the electrode assembly 22 is cylindrical, and correspondingly, may be a cylindrical structure.
- the housing 21 may further include a positive electrode terminal and a negative electrode terminal, wherein the positive electrode terminal is mounted on the end cap 212, and the negative electrode terminal is mounted on the end of the housing 211 opposite to the end cap 212.
- the positive electrode terminal may be mounted on the end of the housing 211 opposite to the end cap 212, and the negative electrode terminal may be mounted on the end cap 212.
- the positive electrode terminal and the negative electrode terminal are respectively used to electrically connect to the pole ears 2212 at both ends of the electrode assembly 22 in the first direction X, so as to output or input the electrical energy of the battery cell 20.
- the materials of the positive electrode terminal and the negative electrode terminal can be various, such as copper, iron, aluminum, steel or aluminum alloy.
- the positive electrode terminal and the negative electrode terminal may be directly connected to the tab 2212 of the electrode assembly 22, for example, by welding or abutting, or the positive electrode terminal and the negative electrode terminal may be indirectly connected to the tab 2212 of the electrode assembly 22, for example, by abutting or welding the positive electrode terminal and the negative electrode terminal to the electrode assembly 22 through other components.
- the battery cell 20 may further include a current collecting member 23 , which is disposed between the housing 21 and the tab 2212 along the first direction X, and the current collecting member 23 connects the housing 21 and the tab 2212 .
- the current collecting component 23 serves to connect the electrode ear 2212 of the electrode assembly 22 with the positive electrode terminal or the negative electrode terminal to achieve electrical connection between the electrode assembly 22 and the positive electrode terminal or the negative electrode terminal.
- the material of the current collecting component 23 can be various, such as copper, iron, aluminum, steel or aluminum alloy.
- the battery cell 20 includes two current collecting members 23 , which are respectively arranged at both ends of the electrode assembly 22 in the first direction X, one current collecting member 23 connecting the positive electrode terminal and one pole ear 2212 of the electrode assembly 22 , and the other current collecting member 23 connecting the negative electrode terminal and the other pole ear 2212 of the electrode assembly 22 , so as to realize the input or output of electrical energy of the battery cell 20 .
- the current collecting component 23 and the pole tab 2212 may be connected in various ways, such as welding, bonding or abutting.
- the current collecting component 23 and the pole tab 2212 are connected by welding.
- the outer shell 21 and the pole ear 2212 of the electrode assembly 22 are connected through the current collecting component 23, so that the input or output of electric energy of the battery cell 20 can be realized.
- This structure is simple, easy to implement, and helps to reduce the difficulty of assembly between the pole ear 2212 and the outer shell 21.
- FIG. 18 is a schematic diagram of the connection between the current collecting member 23 and the pole tab 2212 of the electrode assembly 22 provided in some embodiments of the present application.
- the current collecting member 23 is welded to the pole tab 2212, and along the first direction X, the thickness of the pole tab 2212 is D5 , and the thickness of the current collecting member 23 is D6 , satisfying that D6 ⁇ 1.5D5 .
- the current collecting member 23 is disposed at one end of the electrode assembly 22 in the first direction X, so that the current collecting member 23 can be welded to the electrode tab 2212 at one end of the electrode assembly 22 in the first direction X.
- the thickness of the tab 2212 is D 5 , that is, after the multiple tab portions 22121 of the tab 2212 are bent relative to the first direction X by smoothing or kneading processes and stacked on one end of the main body 223 of the electrode assembly 22 in the first direction X, the size of the tab 2212 in the first direction X is D 5 .
- the thickness of the current collecting member 23 is D 6 , that is, the dimension of the current collecting member 23 in the first direction X is D 6 .
- the thickness of the current collecting member 23 is less than or equal to 1.5 times the thickness of the tab 2212.
- the thickness D 6 of the current collecting member 23 may be 1.5 times, 1.4 times, 1.2 times, 1.25 times, 1 times, 0.9 times, 0.8 times, 0.75 times, or 0.5 times the thickness D 5 of the tab 2212.
- the thickness of the current collecting member 23 and the thickness of the tab 2212 were set to different sizes, so that the ratio of the thickness of the current collecting member 23 to the thickness of the tab 2212 was different, so as to measure the influence of the ratio of the thickness of the current collecting member 23 to the thickness of the tab 2212 on the welding assembly process of the current collecting member 23 and the tab 2212 under different conditions.
- the experimental results are as follows:
- the pole lug 2212 may be welded through, resulting in poor assembly quality of the current collecting component 23 and the pole lug 2212, which cannot meet assembly requirements.
- the ratio of the thickness of the current collecting component 23 to the thickness of the pole lug 2212 is less than or equal to 1.5, the phenomenon of the pole lug 2212 being welded through can be alleviated, which is beneficial to improving the assembly quality of the current collecting component 23 and the pole lug 2212. Therefore, the ratio of the thickness of the current collecting component 23 to the thickness of the pole lug 2212 is set to be less than or equal to 1.5, that is, D 6 ⁇ 1.5D 5 .
- the thickness of the current collecting component 23 in the first direction X is less than or equal to 1.5 times the thickness of the pole tab 2212 in the first direction X, the phenomenon of excessive welding power required for welding the current collecting component 23 and the pole tab 2212 due to the thickness of the current collecting component 23 being too large than the thickness of the pole tab 2212 can be alleviated, thereby effectively reducing the risk of the pole tab 2212 being welded through, thereby reducing the phenomenon of damage to the electrode assembly 22, which is beneficial to improving the production quality of the battery cell 20.
- the current collecting member 23 is welded to the pole lug 2212 to form a weld mark 24 .
- the weld mark 24 covers the protrusion 22121 a of at least one pole lug portion 22121 .
- the weld mark 24 covers the protrusion 22121a of at least one pole ear portion 22121 , that is, in the first direction X, the position where the current collecting component 23 and the pole ear 2212 are welded to each other is arranged corresponding to the protrusion 22121a of at least one pole ear portion 22121 .
- the weld mark 24 formed by welding the current collecting component 23 and the pole lug 2212 to each other is set to cover the protrusion 22121a of at least one pole lug portion 22121 in the first direction X, so that the position where the current collecting component 23 and the pole lug 2212 are welded to each other is located in the area of the pole lug 2212 thickened by the protrusion 22121a, which helps to further reduce the risk of the pole lug 2212 being welded through during the assembly process.
- a battery 100 is further provided, and the battery 100 includes a battery cell 20 of any of the above schemes.
- the battery 100 may further include a box body 10 , in which the battery cells 20 are accommodated.
- the battery cell 20 contained in the box body 10 may be one or more.
- the battery 100 includes a plurality of battery cells 20, and the plurality of battery cells 20 are contained in the box body 10.
- 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 both connected in series and in parallel.
- the plurality of battery cells 20 may be directly connected in series, in parallel, or in mixed connection, and then the whole formed by the plurality of battery cells 20 is contained in the box body 10.
- an electric device is further provided, the electric device comprises a battery 100 according to any of the above schemes, and the battery 100 is used to provide electric energy to the electric device.
- the power-consuming device may be any of the aforementioned devices or systems using the battery 100 .
- the present application provides an electrode assembly 22, which is a winding structure, and includes two pole pieces 221 with opposite polarities and a separator 222 for isolating the two pole pieces 221, and the two pole pieces 221 and the separator 222 are wound along a winding direction Y to form a main body 223 and two pole ears 2212, and the pole ears 2212 of the two pole pieces 221 are respectively arranged at two ends of the main body 223 in the first direction X.
- the pole piece 221 includes a main body 2211 and a pole ear 2212, and the extension direction of the main body 2211 is consistent with the winding direction Y.
- the main body 2211 includes a substrate 22111 and an active material layer 22112 arranged on both sides of the substrate 22111.
- the substrate 22111 includes a coating area 22111a and a spacing area 22111b.
- the coating area 22111a and the spacing area 22111b are arranged along a first direction X, and the active material layer 22112 is arranged in the coating area 22111a.
- the pole lug 2212 includes a plurality of pole lug portions 22121, the pole lug portion 22121 is connected to one end of the spacing area 22111b away from the coating area 22111a in the first direction X, and the plurality of pole lug portions 22121 are spaced apart along the winding direction Y, and at least a portion of the plurality of pole lug portions 22121 are stacked along the first direction X to form a pole lug 2212 at one end of the electrode assembly 22 along the first direction X, and the thickness of the pole lug 2212 in the first direction X is D 5 , satisfying 0.2 mm ⁇ D 5 ⁇ 2.5 mm.
- a plurality of protrusions 22121a are formed on one side of the pole ear portion 22121, and a groove 22121b is formed on the side of the pole ear portion 22121 away from the protrusion 22121a and corresponding to the position of the protrusion 22121a.
- the protrusion 22121a of one pole ear portion 22121 and the groove 22121b of the other pole ear portion 22121 are staggered.
- the projection area of the pole ear portion 22121 is S 1
- the sum of the projection areas of the multiple protrusions 22121a on the pole ear portion 22121 is S 2 , satisfying S 2 /S 1 ⁇ 0.5
- the pole ear portion 22121 includes a main body area 22121c that does not overlap with the projection of the protrusion 22121a in the thickness direction Z of the pole ear portion, and along the thickness direction Z of the pole ear portion, the maximum size of the pole ear portion 22121 is D 1
- the thickness of the main body area 22121c is D 2 , satisfying 2 ⁇ D 1 /D 2 ⁇ 8.
- the protrusions 22121a are hemispherical structures, the multiple protrusions 22121a include multiple rows of protrusions 22121a arranged at intervals, each row of protrusions 22121a includes multiple protrusions 22121a arranged at intervals, and the diameter of the protrusions 22121a in a direction perpendicular to the thickness direction Z of the pole ear portion is W 1 , satisfying 0.3mm ⁇ W 1 ⁇ 2mm.
- the present application provides a battery cell 20, which includes a housing 21, an electrode assembly 22, and a current collecting member 23.
- the electrode assembly 22 is accommodated in the housing 21.
- the current collecting member 23 is disposed between the housing 21 and the pole tab 2212.
- the current collecting member 23 is welded to the pole tab 2212 to form a weld mark 24.
- the weld mark 24 covers the protrusion 22121a of at least one pole tab portion 22121.
- the thickness of the pole tab 2212 is D 5
- the thickness of the current collecting member 23 is D 6 , satisfying that D 6 ⁇ 1.5D 5 .
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Abstract
Description
Claims (29)
- 一种电极组件,包括:极性相反的两个极片和用于隔离两个所述极片的隔离件,两个所述极片以及所述隔离件沿卷绕方向卷绕后形成主体和两个极耳;其中,所述极耳和所述主体沿所述第一方向设置,所述极耳包括沿所述卷绕方向间隔设置的多个极耳部,所述极耳部相对于所述第一方向弯折设置,所述多个极耳部的至少一部分沿所述第一方向层叠设置,且所述极耳部在其厚度方向上的至少一侧形成有凸起。
- 根据权利要求1所述的电极组件,其中,沿所述极耳部的厚度方向,所述极耳部的至少一侧形成有多个所述凸起。
- 根据权利要求2所述的电极组件,其中,沿所述极耳部的厚度方向,所述极耳部的投影面积为S1,所述极耳部上的多个所述凸起的投影面积之和为S2,满足,S2/S1≥0.5。
- 根据权利要求1-3任一项所述的电极组件,其中,所述极耳部包括在所述极耳部的厚度方向上与所述凸起的投影不重叠的主体区,所述凸起沿所述极耳部的厚度方向凸出于所述主体区;沿所述极耳部的厚度方向,所述极耳部的最大尺寸为D1,所述主体区的厚度为D2,满足,2≤D1/D2≤8。
- 根据权利要求1-4任一项所述的电极组件,其中,所述极耳部形成有多排凸起,每排凸起包括间隔设置的多个所述凸起。
- 根据权利要求5所述的电极组件,其中,所述凸起在垂直于所述极耳部的厚度方向的方向上的最大尺寸为W1,满足,0.3mm≤W1≤2mm。
- 根据权利要求1-4任一项所述的电极组件,其中,所述极耳部形成有间隔排布的多个所述凸起,所述凸起的两端沿垂直于多个所述凸起的排布方向的方向分别延伸至所述极耳部的两端。
- 根据权利要求7所述的电极组件,其中,沿多个所述凸起的排布方向,所述凸起的宽度为W2,满足,0.3mm≤W2≤2mm。
- 根据权利要求1-8任一项所述的电极组件,其中,沿所述极耳部的厚度方向,所述极耳部包括层叠设置的多个箔材,所述箔材的一侧形成有凸部,另一侧与所述凸部对应的位置形成有凹部,在相邻的两个所述箔材中,一个所述箔材的所述凸部容纳于另一个所述箔材的所述凹部内;其中,沿所述极耳部的厚度方向,位于所述极耳部的一侧的所述凸部为所述凸起。
- 根据权利要求9所述的电极组件,其中,多个所述箔材焊接连接,以在所述箔材上形成所述凸部和所述凹部。
- 根据权利要求9或10所述的电极组件,其中,所述极片包括主体部,多个所述极耳部连接于所述主体部,两个所述极片的所述主体部和所述隔离件沿所述卷绕方向卷绕形成所述主体,所述主体部包括基材和设置于所述基材的至少一侧的活性物质层;多个所述箔材包括层叠设置的第一箔材和第二箔材,所述第一箔材连接于所述基材在所述第一方向上的一端,并与所述基材一体成型,所述第二箔材与所述基材分体设置。
- 根据权利要求11所述的电极组件,其中,所述基材包括涂覆区和间隔区,所述涂覆区与所述间隔区沿所述第一方向排布,所述活性物质层设置于所述涂覆区,所述间隔区连接所述涂覆区和所述第一箔材。
- 根据权利要求11或12所述的电极组件,其中,沿所述极耳部的厚度方向,所述第一箔材的厚度为D3,所述第二箔材的厚度为D4,满足,0.5≤D3/D4≤2。
- 根据权利要求11-13任一项所述的电极组件,其中,沿垂直于所述极耳部的厚度方向的方向,所述第二箔材靠近所述基材的一端不超出所述第一箔材连接于所述基材的一端。
- 根据权利要求11-14任一项所述的电极组件,其中,沿垂直于所述极耳部的厚度方向的方向,所述第一箔材远离所述基材的一端与所述第二箔材远离所述基材的一端之间的距离为L,满足,L≤2mm。
- 根据权利要求11-15任一项所述的电极组件,其中,所述第一箔材与所述第二箔材的材质相同。
- 根据权利要求1-16任一项所述的电极组件,其中,所述极片包括主体部,多个所述极耳部连接于所述主体部在所述第一方向上的一端,两个所述极片的所述主体部和所述隔离件沿所述卷绕方向卷绕形成所述主体;其中,所述主体部包括基材和设置于所述基材的至少一侧的活性物质层,所述基材包括涂覆区和间隔区,所述涂覆区与所述间隔区沿所述第一方向排布,所述活性物质层设置于所述涂覆区,所述间隔区连接所述涂覆区和所述极耳部。
- 根据权利要求17所述的电极组件,其中,所述极耳部与所述间隔区一体成型。
- 根据权利要求1-18任一项所述的电极组件,其中,沿所述极耳部的厚度方向,所述极耳部背离所述凸起的一侧且对应所述凸起的位置形成有凹槽。
- 根据权利要求19所述的电极组件,其中,沿所述第一方向,在相邻的两个所述极耳部中,一个所述极耳部的所述凸起与另一个所述极耳部的所述凹槽错位设置。
- 根据权利要求1-20任一项所述的电极组件,其中,沿所述第一方向,所述极耳的厚度为D5,满足,0.2mm≤D5≤2.5mm。
- 根据权利要求1-21任一项所述的电极组件,其中,沿所述第一方向,两个所述极耳分别设置于所述主体的两端。
- 根据权利要求1-22任一项所述的电极组件,其中,所述主体呈圆柱状。
- 一种电池单体,包括:外壳;以及如权利要求1-23任一项所述的电极组件,所述电极组件容纳于所述外壳内。
- 根据权利要求24所述的电池单体,其中,所述电池单体还包括:集流构件,沿所述第一方向设置于所述外壳与所述极耳之间,所述集流构件连接所述外壳与所述极耳。
- 根据权利要求25所述的电池单体,其中,所述集流构件与所述极耳焊接连接,沿所述第一方向,所述极耳的厚度为D5,所述集流构件的厚度为D6,满足,D6≤1.5D5。
- 根据权利要求25或26所述的电池单体,其中,所述集流构件与所述极耳焊接连接并形成焊印,沿所述第一方向,所述焊印覆盖至少一个所述极耳部的所述凸起。
- 一种电池,包括如权利要求24-27任一项所述的电池单体。
- 一种用电装置,包括如权利要求28所述的电池。
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202380044182.XA CN119343831A (zh) | 2023-02-10 | 2023-02-10 | 电极组件、电池单体、电池及用电装置 |
| PCT/CN2023/075460 WO2024164308A1 (zh) | 2023-02-10 | 2023-02-10 | 电极组件、电池单体、电池及用电装置 |
| EP23920516.4A EP4597737A4 (en) | 2023-02-10 | 2023-02-10 | ELECTRODE ASSEMBLY, BATTERY ELEMENT, BATTERY AND ELECTRICAL DEVICE |
| US19/055,712 US12586872B2 (en) | 2023-02-10 | 2025-02-18 | Electrode assembly, battery cell, battery and electric device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2023/075460 WO2024164308A1 (zh) | 2023-02-10 | 2023-02-10 | 电极组件、电池单体、电池及用电装置 |
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|---|---|---|---|
| US19/055,712 Continuation US12586872B2 (en) | 2023-02-10 | 2025-02-18 | Electrode assembly, battery cell, battery and electric device |
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| WO2024164308A1 true WO2024164308A1 (zh) | 2024-08-15 |
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| US (1) | US12586872B2 (zh) |
| EP (1) | EP4597737A4 (zh) |
| CN (1) | CN119343831A (zh) |
| WO (1) | WO2024164308A1 (zh) |
Cited By (1)
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| CN119742548A (zh) * | 2025-03-05 | 2025-04-01 | 宁德时代新能源科技股份有限公司 | 电池单体、电池装置和用电设备 |
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| CN120600944B (zh) * | 2025-08-07 | 2025-11-21 | 宁德时代新能源科技股份有限公司 | 电池单体及其制作方法、电池装置及用电设备 |
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| JP2014017053A (ja) * | 2012-07-05 | 2014-01-30 | Toyota Industries Corp | 蓄電装置 |
| CN206065157U (zh) * | 2016-10-08 | 2017-04-05 | 宁德时代新能源科技股份有限公司 | 极片、冲压装置及极片模切极耳系统 |
| CN207009552U (zh) * | 2017-07-20 | 2018-02-13 | 宁德时代新能源科技股份有限公司 | 极片加工设备 |
| CN115000345A (zh) * | 2022-06-27 | 2022-09-02 | 楚能新能源股份有限公司 | 电池极片及其生产方法、包含该极片的电池芯包和电池 |
| CN217740571U (zh) * | 2022-07-21 | 2022-11-04 | 宁德时代新能源科技股份有限公司 | 极片、电极组件、电池单体、电池及用电装置 |
| CN115548464A (zh) * | 2021-06-30 | 2022-12-30 | 比亚迪股份有限公司 | 一种电池极芯、电池其电池极芯的制造方法 |
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| US4049882A (en) * | 1976-02-11 | 1977-09-20 | Union Carbide Corporation | Battery assembly |
| KR20070064555A (ko) * | 2004-04-30 | 2007-06-21 | 에이일이삼 시스템즈 인코포레이티드 | 저 임피던스 적층 배터리 장치 및 그 제조 방법 |
| KR102659830B1 (ko) * | 2018-01-09 | 2024-04-23 | 삼성에스디아이 주식회사 | 이차 전지 및 그 제조 방법 |
| JP7662762B2 (ja) * | 2020-12-29 | 2025-04-15 | エルジー エナジー ソリューション リミテッド | 円筒形バッテリーセル、それを含むバッテリーパック及び自動車 |
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| US12407028B2 (en) * | 2021-02-19 | 2025-09-02 | Lg Energy Solution, Ltd. | Electrode assembly, battery, and battery pack and vehicle including the same |
| MX2023012838A (es) * | 2021-04-29 | 2023-11-09 | Techtronic Cordless Gp | Bateria que incluye una porcion de laminilla plegada, y metodo para fabricar la misma. |
| CN116391270A (zh) * | 2021-05-07 | 2023-07-04 | 宁德时代新能源科技股份有限公司 | 电极组件、电池、装置及电极组件的制造方法 |
| CN116349047B (zh) * | 2021-07-14 | 2025-09-02 | 宁德时代新能源科技股份有限公司 | 电池组件及加工方法和装置、电池单体、电池和用电设备 |
-
2023
- 2023-02-10 WO PCT/CN2023/075460 patent/WO2024164308A1/zh not_active Ceased
- 2023-02-10 EP EP23920516.4A patent/EP4597737A4/en active Pending
- 2023-02-10 CN CN202380044182.XA patent/CN119343831A/zh active Pending
-
2025
- 2025-02-18 US US19/055,712 patent/US12586872B2/en active Active
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| CN206065157U (zh) * | 2016-10-08 | 2017-04-05 | 宁德时代新能源科技股份有限公司 | 极片、冲压装置及极片模切极耳系统 |
| CN207009552U (zh) * | 2017-07-20 | 2018-02-13 | 宁德时代新能源科技股份有限公司 | 极片加工设备 |
| CN115548464A (zh) * | 2021-06-30 | 2022-12-30 | 比亚迪股份有限公司 | 一种电池极芯、电池其电池极芯的制造方法 |
| CN115000345A (zh) * | 2022-06-27 | 2022-09-02 | 楚能新能源股份有限公司 | 电池极片及其生产方法、包含该极片的电池芯包和电池 |
| CN217740571U (zh) * | 2022-07-21 | 2022-11-04 | 宁德时代新能源科技股份有限公司 | 极片、电极组件、电池单体、电池及用电装置 |
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| CN119742548A (zh) * | 2025-03-05 | 2025-04-01 | 宁德时代新能源科技股份有限公司 | 电池单体、电池装置和用电设备 |
Also Published As
| Publication number | Publication date |
|---|---|
| US20250192386A1 (en) | 2025-06-12 |
| EP4597737A4 (en) | 2026-03-11 |
| CN119343831A (zh) | 2025-01-21 |
| US12586872B2 (en) | 2026-03-24 |
| EP4597737A1 (en) | 2025-08-06 |
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