WO2024092638A1 - Ensemble électrode et son procédé de fabrication, élément de batterie, batterie et dispositif électrique - Google Patents

Ensemble électrode et son procédé de fabrication, élément de batterie, batterie et dispositif électrique Download PDF

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Publication number
WO2024092638A1
WO2024092638A1 PCT/CN2022/129616 CN2022129616W WO2024092638A1 WO 2024092638 A1 WO2024092638 A1 WO 2024092638A1 CN 2022129616 W CN2022129616 W CN 2022129616W WO 2024092638 A1 WO2024092638 A1 WO 2024092638A1
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WIPO (PCT)
Prior art keywords
pole ear
electrode assembly
electrode sheet
along
straight
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PCT/CN2022/129616
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English (en)
Chinese (zh)
Inventor
任翔
叶杰
尚志同
林文法
吴永江
Original Assignee
宁德时代新能源科技股份有限公司
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Application filed by 宁德时代新能源科技股份有限公司 filed Critical 宁德时代新能源科技股份有限公司
Priority to PCT/CN2022/129616 priority Critical patent/WO2024092638A1/fr
Priority to CN202280093426.9A priority patent/CN118843964A/zh
Publication of WO2024092638A1 publication Critical patent/WO2024092638A1/fr

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators

Definitions

  • the present application relates to the field of battery technology, and in particular to an electrode assembly and a manufacturing method thereof, a battery cell, a battery and an electrical device.
  • the battery cell of the battery is assembled into an electrode assembly (bare cell) by winding or laminating the positive electrode sheet, the negative electrode sheet and the separator, and then loaded into the shell and finally injected with the electrolyte.
  • the embodiments of the present application provide an electrode assembly and a method for manufacturing the same, a battery cell, a battery, and an electrical device, which can effectively improve the performance of the electrode assembly.
  • an embodiment of the present application provides an electrode assembly, comprising a positive electrode sheet and a negative electrode sheet;
  • the positive electrode sheet has a first bent section and a plurality of first straight sections, and each adjacent two of the first straight sections are connected by the first bent section;
  • the negative electrode sheet has a second bent section and a plurality of second straight sections, and each adjacent two of the second straight sections are connected by the second bent section; wherein the first straight sections and the second straight sections are alternately stacked along a first direction, along the second direction, the first bent section is located at one end of the first straight section, and along the third direction, the second bent section is located at one end of the second straight section, and the first direction, the second direction and the third direction are perpendicular to each other.
  • the positive electrode sheet in the electrode assembly is formed with a first bent section and a plurality of first straight sections
  • the negative electrode sheet in the electrode assembly is formed with a second bent section and a plurality of second straight sections, by alternately stacking the first straight section of the positive electrode sheet and the second straight section of the negative electrode sheet along the first direction, and setting the first bent section connecting two adjacent first straight sections at one end of the first straight section along the second direction, and setting the second bent section connecting two adjacent second straight sections at one end of the second straight section along the third direction, so that the positive electrode sheet and the negative electrode sheet are a stacked structure formed by cross-winding with each other, so that at least one side of the electrode assembly in the second direction only has the first bent section of the positive electrode sheet, and at least one side in the third direction only has the second bent section of the negative electrode sheet.
  • the electrode assembly using this structure can effectively alleviate the phenomenon of misalignment of the positive electrode sheet and the negative electrode sheet during the production process, so as to improve the manufacturing accuracy of the electrode assembly, thereby effectively improving the production quality of the electrode assembly, which is conducive to improving the performance of the electrode assembly.
  • a plurality of the first bending segments are formed on at least one side of the electrode assembly, and the plurality of the first bending segments are stacked along the second direction.
  • a plurality of first bending sections stacked along the second direction are formed on at least one side of the electrode assembly in the second direction, that is, the positive electrode sheet is a structure that is always wound along the same direction, thereby forming a plurality of first bending sections stacked in the second direction.
  • the electrode assembly with such a structure is easy to manufacture, and there is no need to change the winding direction of the positive electrode sheet during the processing of the electrode assembly, thereby facilitating the control of the tension of the positive electrode sheet, which can effectively reduce the phenomenon of wrinkles on the positive electrode sheet and is beneficial to improving the production efficiency of the electrode assembly.
  • a plurality of the first bending segments are formed on both sides of the electrode assembly.
  • a plurality of first bent sections are formed on both sides of the electrode assembly in the second direction, so that the positive electrode sheet can be formed with a plurality of first straight sections, which is beneficial to improving the capacitance of the electrode assembly.
  • a plurality of the second bending segments are formed on at least one side of the electrode assembly, and the plurality of the second bending segments are stacked along the third direction.
  • a plurality of second bending sections stacked along the third direction are formed on at least one side of the electrode assembly in the third direction, that is, the negative electrode sheet is a structure that is always wound along the same direction, thereby forming a plurality of second bending sections stacked in the third direction.
  • the electrode assembly with such a structure is easy to manufacture, and there is no need to change the winding direction of the negative electrode sheet during the processing of the electrode assembly, thereby facilitating the control of the tension of the negative electrode sheet, which can effectively reduce the phenomenon of wrinkles on the negative electrode sheet and is beneficial to improving the production efficiency of the electrode assembly.
  • a plurality of the second bending segments are formed on both sides of the electrode assembly.
  • a plurality of second bent sections are formed on both sides of the electrode assembly in the third direction, so that the negative electrode plate can be formed with a plurality of second straight sections, which is beneficial to improving the capacitance of the electrode assembly.
  • the first straight segment has a first pole ear portion, and along the first direction, the first pole ear portions of multiple first straight segments are stacked and connected to form a first pole ear; wherein, along the first direction, a first hollow area is formed in the second straight segment toward the first pole ear portion.
  • the first straight section has a first pole ear portion, and the first pole ear portions of the plurality of first straight sections are stacked and connected to form a first pole ear for outputting or inputting the positive electrode of the electrode assembly.
  • the first pole ear portion of this structure does not need to be turned over, which is beneficial to improving the service life of the first pole ear portion and the production efficiency of the electrode assembly.
  • the first hollow area can avoid the first pole ear portion, so as to reduce the risk of short circuit between the positive pole piece and the negative pole piece, and can reduce the difficulty of assembling the plurality of first pole ear portions stacked and connected.
  • the positive electrode plate includes a first current collector and a first active material layer; the first active material layer is coated on at least one side of the first current collector; wherein a first through hole is provided in an area where the first active material layer is located in the first straight section, the first through hole penetrates the first active material layer along the first direction, and the first current collector forms the first electrode ear in an area opposite to the first through hole.
  • the first pole ear portion is the portion where the first through hole of the first active material layer on the first straight section corresponding to the first current collector is located. That is to say, the area of the first current collector located in the first straight section that does not cover the first active material layer at the first through hole corresponding to the first active material layer is the first pole ear portion, so as to realize the structure in which the first pole ear portion is built-in.
  • the first pole ear portion with such a structure is beneficial to improving the flow area between the first pole ear portion and the first current collector and can reduce the internal resistance of the electrode assembly.
  • the first pole ear portion can be formed without cutting the first current collector, which is beneficial to optimizing the production rhythm of the electrode assembly to improve production efficiency.
  • the first pole ear portion is located at an edge of the first straight segment in the second direction and the third direction.
  • the first pole ear portion by arranging the first pole ear portion at the edge of the first straight section in the second direction and the third direction, that is, the first pole ear portion is located at the corner of the first straight section, it is convenient to subsequently stack and assemble the first pole ear portion, thereby reducing the manufacturing difficulty of the electrode assembly.
  • the positive electrode sheet includes a first current collector and a first active material layer; the first active material layer is coated on at least one side of the first current collector; wherein a first blank area not coated with the first active material layer is formed in the area where the first current collector is located in the first bending section.
  • the first bending section will not participate in the chemical reaction, so that the electrode assembly using this structure is conducive to reducing the waste of the first active material layer on the one hand, so as to reduce the manufacturing cost of the electrode assembly, and on the other hand, it is convenient to assemble after the first bending section is bent, and it is conducive to alleviating the phenomenon of the first active material layer falling off.
  • the first straight section is provided with a first pole ear portion
  • the first blank area can connect the first pole ear portions of the two adjacent first straight sections.
  • This structure is easy to manufacture, and there is no need to set the first pole ear portions of the two adjacent first straight sections in a spaced arrangement structure, which is conducive to controlling the manufacturing accuracy and reducing the manufacturing difficulty, thereby effectively improving the production quality and production efficiency of the electrode assembly.
  • the second straight segment has a second pole ear portion, and along the first direction, the second pole ear portions of multiple second straight segments are stacked and connected to form a second pole ear; wherein, along the first direction, a second hollow area is formed in the first straight segment toward the second pole ear portion.
  • the second straight section has a second pole ear portion, and the second pole ear portions of the plurality of second straight sections are stacked and connected to form a second pole ear for outputting or inputting the negative electrode of the electrode assembly.
  • the second pole ear portion of this structure does not need to be turned over, which is beneficial to improving the service life of the second pole ear portion and the production efficiency of the electrode assembly.
  • the second hollow area can avoid the second pole ear portion, so as to reduce the risk of short circuit between the positive pole piece and the negative pole piece, and can reduce the difficulty of assembling the plurality of second pole ear portions stacked and connected.
  • the negative electrode plate includes a second current collector and a second active material layer; the second active material layer is coated on at least one side of the second current collector; wherein a second through hole is provided in an area where the second active material layer is located in the second straight section, the second through hole penetrates the second active material layer along the first direction, and the second current collector forms the second pole ear portion in an area opposite to the second through hole.
  • the second pole ear portion is the portion where the second through hole of the second active material layer on the second straight section corresponding to the second current collector is located. That is to say, the area of the second current collector located in the second straight section that does not cover the second active material layer at the second through hole corresponding to the second active material layer is the second pole ear portion, so as to realize the structure in which the second pole ear portion is built-in.
  • the second pole ear portion with such a structure is beneficial to improving the flow area between the second pole ear portion and the second current collector and can reduce the internal resistance of the electrode assembly.
  • the second pole ear portion can be formed without cutting the second current collector, which is beneficial to optimizing the production rhythm of the electrode assembly to improve production efficiency.
  • the second pole ear portion is located at an edge of the second straight segment in the second direction and the third direction.
  • the second pole ear portion by arranging the second pole ear portion at the edge of the second straight section in the second direction and the third direction, that is, the second pole ear portion is located at the corner of the second straight section, it is convenient to subsequently stack and assemble the second pole ear portion, thereby reducing the manufacturing difficulty of the electrode assembly.
  • the negative electrode plate includes a second current collector and a second active material layer; the second active material layer is coated on at least one side of the second current collector; wherein a second blank area not coated with the second active material layer is formed in the area where the second current collector is located in the second bending section.
  • the second bending section will not participate in the chemical reaction, so that the electrode assembly using this structure is conducive to reducing the waste of the second active material layer on the one hand, so as to reduce the manufacturing cost of the electrode assembly, and on the other hand, it is convenient to assemble after the second bending section is bent, and it is conducive to alleviating the phenomenon of the second active material layer falling off.
  • the second straight section is provided with a second pole ear portion
  • the second blank area can connect the second pole ear portions of the two adjacent second straight sections.
  • This structure is easy to manufacture, and there is no need to set the second pole ear portions of the two adjacent second straight sections in a spaced arrangement structure, which is conducive to controlling the manufacturing accuracy and reducing the manufacturing difficulty, thereby effectively improving the production quality and production efficiency of the electrode assembly.
  • the first straight segment has a first pole ear portion, which is located at the edge of the first straight segment in the second direction and the third direction
  • the second straight segment has a second pole ear portion, which is located at the edge of the second straight segment in the second direction and the third direction; wherein the first pole ear portion and the second pole ear portion are spaced apart along the second direction, and/or the first pole ear portion and the second pole ear portion are spaced apart along the third direction.
  • the first pole ear portion and the second pole ear portion are spaced apart in the second direction and/or the third direction to increase the distance between the first pole ear portion and the second pole ear portion, it is beneficial to reduce the risk of short circuit between the first pole ear portion and the second pole ear portion on the one hand, and on the other hand, it is convenient to assemble the first pole ear portion and the second pole ear portion with other components respectively subsequently to reduce the interference between them.
  • the electrode assembly further includes a separator; the separator is disposed between the positive electrode sheet and the negative electrode sheet to separate the positive electrode sheet from the negative electrode sheet.
  • the electrode assembly is also provided with an isolation membrane.
  • the isolation membrane By arranging the isolation membrane between the positive electrode sheet and the negative electrode sheet to achieve separation between the positive electrode sheet and the negative electrode sheet, the short circuit phenomenon between the positive electrode sheet and the negative electrode sheet can be reduced, which is beneficial to reducing the safety hazards of the electrode assembly during use.
  • the first straight segment has a first pole ear portion
  • the second straight segment has a second pole ear portion; wherein a third hollow area is formed at a position of the isolation membrane opposite to the first pole ear portion, and a fourth hollow area is formed at a position of the isolation membrane opposite to the second pole ear portion.
  • a third hollow area and a fourth hollow area are respectively provided on the isolation membrane in an area corresponding to the first pole ear portion of the first straight segment and an area corresponding to the second pole ear portion of the second straight segment, so that the isolation membrane can avoid the first pole ear portion and the second pole ear portion, so as to facilitate the subsequent stacking and assembly connection of the first pole ear portion and the second pole ear portion, thereby effectively reducing the blocking and interference effects of the isolation membrane on the first pole ear portion and the second pole ear portion.
  • the electrode assembly is provided with two isolation membranes, and one of the isolation membranes is stacked with the positive electrode sheet and then assembled together with the positive electrode sheet, and the other isolation membrane is stacked with the negative electrode sheet and then assembled together with the negative electrode sheet, so that the two isolation membranes can cooperate to separate the positive electrode sheet and the negative electrode sheet after the first straight section of the positive electrode sheet and the second straight section of the negative electrode sheet are alternately stacked.
  • the electrode assembly adopting this structure is convenient for assembling the isolation membrane, which is beneficial to reducing the difficulty of assembling the isolation membrane and can effectively ensure the separation effect between the positive electrode sheet and the negative electrode sheet.
  • the positive electrode plate is a wound structure wound around a first axis, and the first axis extends along the third direction;
  • the negative electrode plate is a wound structure wound around a second axis, and the second axis extends along the second direction.
  • the electrode assembly using this structure is easy to manufacture, and there is no need to change the winding direction of the positive electrode sheet and the negative electrode sheet during the processing of the electrode assembly, thereby facilitating the control of the tension of the positive electrode sheet and the negative electrode sheet, which can effectively reduce the phenomenon of wrinkles on the positive electrode sheet and the negative electrode sheet, and is beneficial to improving the production efficiency of the electrode assembly.
  • 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 housing includes a shell and an end cap; an opening is formed on one side of the shell along the first direction, and the electrode assembly is accommodated in the shell; and the end cap covers the opening.
  • the assembly direction of the electrode assembly into the shell is the same as the stacking direction of the first straight section and the second straight section, thereby facilitating the assembly of the electrode assembly into the shell and helping to reduce the difficulty of assembling the battery cell.
  • the battery cell also includes a positive terminal and a negative terminal, and the positive terminal and the negative terminal are insulated and installed on the end cover or the shell;
  • the first straight segment has a first pole ear portion, and along the first direction, the first pole ear portions of multiple first straight segments are stacked and connected to form a first pole ear, and the first pole ear is electrically connected to the positive terminal;
  • the second straight segment has a second pole ear portion, and along the first direction, the second pole ear portions of multiple second straight segments are stacked and connected to form a second pole ear, and the second pole ear is electrically connected to the negative terminal.
  • the positive terminal and the negative terminal can be connected to the first pole ear formed by stacking multiple first pole ear portions along the first direction
  • the negative terminal can be connected to the second pole ear formed by stacking multiple second pole ear portions along the first direction.
  • the battery cell adopting this structure can, on the one hand, reduce the difficulty of assembling between the positive terminal and the first pole ear and between the negative terminal and the second pole ear, which is beneficial to improving the production efficiency of the battery cell; on the other hand, the positive terminal and the negative terminal can effectively utilize the space between the first pole ear and the second pole ear and the end cover, which is beneficial to improving the internal space utilization of the battery cell.
  • the battery cell includes two electrode assemblies, which are stacked along the first direction; the battery cell also includes a positive current collecting component, which includes a first connecting portion and a second connecting portion.
  • the first connecting portion is located between the two electrode assemblies and connects the first pole ears of the two electrode assemblies, and the second connecting portion extends along the first direction, one end of the second connecting portion is connected to the first connecting portion, and the other end is connected to the positive terminal.
  • the positive electrode current collecting component is provided as a first connecting portion and a second connecting portion which are connected to each other, and the first connecting portion is provided between the two electrode assemblies in the first direction, so that the first connecting portion can be connected to the first pole ears of the two electrode assemblies at the same time, so that after the second connecting portion is connected to the positive terminal, the first pole ears of the two electrode assemblies can be electrically connected to the positive terminal, which is beneficial to reducing the connection difficulty between the electrode assembly and the positive terminal, and there is no need to provide two positive electrode current collecting components which are respectively connected to the two electrode assemblies, which is beneficial to reducing the manufacturing cost of the battery cell.
  • the second connecting portion is a sheet-like structure that is perpendicular to the first direction.
  • the positive electrode current collecting component with such a structure is beneficial to increase the connection area between the second connecting portion and the first pole ears of the two electrode assemblies, thereby facilitating the connection stability and flow conduction area between the positive electrode current collecting component and the first pole ears of the electrode assemblies.
  • the battery cell includes two electrode assemblies, which are stacked along the first direction; the battery cell also includes a negative current collecting component, which includes a third connecting portion and a fourth connecting portion, and along the first direction, the third connecting portion is located between the two electrode assemblies and connects the second pole ears of the two electrode assemblies, and the fourth connecting portion extends along the first direction, one end of the fourth connecting portion is connected to the third connecting portion, and the other end is connected to the negative terminal.
  • a negative current collecting component which includes a third connecting portion and a fourth connecting portion, and along the first direction, the third connecting portion is located between the two electrode assemblies and connects the second pole ears of the two electrode assemblies, and the fourth connecting portion extends along the first direction, one end of the fourth connecting portion is connected to the third connecting portion, and the other end is connected to the negative terminal.
  • the negative electrode current collecting component is provided as a third connecting portion and a fourth connecting portion which are connected to each other, and the third connecting portion is provided between the two electrode assemblies in the first direction, so that the third connecting portion can be connected to the second pole ears of the two electrode assemblies at the same time, so that after the fourth connecting portion is connected to the negative terminal, the second pole ears of the two electrode assemblies can be electrically connected to the negative terminal, which is beneficial to reducing the connection difficulty between the electrode assembly and the negative terminal, and there is no need to provide two negative electrode current collecting components which are respectively connected to the two electrode assemblies, which is beneficial to reducing the manufacturing cost of the battery cell.
  • the fourth connecting portion is a sheet-like structure that is perpendicular to the first direction.
  • the negative electrode current collecting component with such a structure is beneficial to increase the connection area between the fourth connecting portion and the second pole ears of the two electrode assemblies, thereby facilitating the connection stability and flow conduction area between the negative electrode current collecting component and the second pole ears of the electrode assemblies.
  • an embodiment of the present application further provides a battery comprising a plurality of the above-mentioned battery cells.
  • an embodiment of the present application further provides an electrical device, comprising the above-mentioned battery, wherein the battery is used to provide electrical energy.
  • an embodiment of the present application also provides a method for manufacturing an electrode assembly, comprising: providing a positive electrode sheet and a negative electrode sheet; alternately winding the positive electrode sheet and the negative electrode sheet so that the positive electrode sheet is formed with a first bent section and a plurality of first straight sections, and each adjacent two first straight sections are connected by the first bent section, and the negative electrode sheet is formed with a second bent section and a plurality of second straight sections, and each adjacent two second straight sections are connected by the second bent section; wherein the first straight sections and the second straight sections are alternately stacked along a first direction, and along the second direction, the first bent section is located at one end of the first straight section, and along the third direction, the second bent section is located at one end of the second straight section, and the first direction, the second direction and the third direction are perpendicular to each other.
  • the manufacturing method of the electrode assembly is to alternately wind the positive electrode sheet and the negative electrode sheet so that the first straight section of the positive electrode sheet and the second straight section of the negative electrode sheet are alternately stacked along the first direction, and the first bent section connecting the two adjacent first straight sections is arranged at one end of the first straight section along the second direction, and the second bent section connecting the two adjacent second straight sections is arranged at one end of the second straight section along the third direction, so that the positive electrode sheet and the negative electrode sheet are wound crosswise to form a stacked structure, that is, the positive electrode sheet is extended around the third direction.
  • the winding structure is formed by winding the positive electrode sheet around the axis extending in the second direction, and the negative electrode sheet is wound around the axis extending in the second direction.
  • the electrode assembly formed by this manufacturing method can, on the one hand, effectively alleviate the misalignment of the positive electrode sheet and the negative electrode sheet during the production process, so as to improve the manufacturing accuracy of the electrode assembly, thereby effectively improving the production quality of the electrode assembly; on the other hand, there is no need to change the winding direction of the positive electrode sheet and the negative electrode sheet, thereby facilitating the control of the tension of the positive electrode sheet and the negative electrode sheet, which can effectively reduce the wrinkling of the positive electrode sheet and the negative electrode sheet, and is conducive to improving the production efficiency of the electrode assembly.
  • the manufacturing method of the electrode assembly also includes: providing two isolation films; before alternately winding the positive electrode sheet and the negative electrode sheet, the manufacturing method of the electrode assembly also includes: stacking one of the two isolation films with the positive electrode sheet and extending along the extension direction of the positive electrode sheet; stacking the other of the two isolation films with the negative electrode sheet and extending along the extension direction of the negative electrode sheet.
  • the two isolation membranes are respectively stacked with the positive electrode sheets and the negative electrode sheets, so that the two isolation membranes are respectively wound with the positive electrode sheets and the negative electrode sheets, so that the two isolation membranes are respectively stacked on both sides of the first straight section of the positive electrode sheet and on both sides of the second straight section of the negative electrode sheet in the first direction, so that the two isolation membranes can effectively separate the positive electrode sheet and the negative electrode sheet to reduce the risk of short circuit between the positive electrode sheet and the negative electrode sheet.
  • This manufacturing method facilitates the assembly of the isolation membrane between the positive electrode sheet and the negative electrode sheet, which is beneficial to reduce the difficulty of assembling the isolation membrane and can effectively ensure the separation effect between the positive electrode sheet and the negative electrode sheet.
  • 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 by some embodiments of the present application.
  • FIG3 is a schematic diagram of the structure of a battery cell provided in some embodiments of the present application.
  • FIG4 is an exploded view of the structure of a battery cell provided in some embodiments of the present application.
  • FIG5 is a schematic diagram of the structure of an electrode assembly provided in some embodiments of the present application.
  • FIG6 is a cross-sectional view of an electrode assembly provided in some embodiments of the present application, perpendicular to a third direction;
  • FIG7 is a cross-sectional view of an electrode assembly provided in some embodiments of the present application, perpendicular to the second direction;
  • FIG8 is a schematic diagram of the structure of an electrode assembly during assembly provided in some embodiments of the present application.
  • FIG9 is a schematic diagram of a partial structure of an unfolded positive electrode sheet of an electrode assembly provided in some embodiments of the present application.
  • FIG10 is a schematic diagram of a partial structure of an unfolded negative electrode sheet of an electrode assembly provided in some embodiments of the present application.
  • FIG11 is a cross-sectional view of a first straight section of a positive electrode sheet of an electrode assembly provided in some embodiments of the present application;
  • FIG12 is a schematic diagram of the structure of an electrode assembly provided in some other embodiments of the present application.
  • FIG13 is a schematic structural diagram of an electrode assembly during assembly provided in some other embodiments of the present application.
  • FIG14 is a schematic diagram of a partial structure of an unfolded positive electrode sheet of an electrode assembly provided in some other embodiments of the present application.
  • FIG15 is a schematic diagram of a partial structure of an unfolded negative electrode sheet of an electrode assembly provided in some other embodiments of the present application.
  • FIG16 is a cross-sectional view of a second straight section of a negative electrode sheet of an electrode assembly provided in some embodiments of the present application.
  • FIG17 is a schematic diagram of the structure of a separator of an electrode assembly provided in some embodiments of the present application.
  • FIG18 is a schematic diagram of the structure of the isolation membrane of the electrode assembly provided in some embodiments of the present application in other embodiments;
  • FIG19 is a schematic flow chart of a method for manufacturing an electrode assembly according to some embodiments of the present application.
  • FIG. 20 is a schematic flow chart of a method for manufacturing an electrode assembly provided in some other 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-housing; 2111-opening; 212-end cover; 22-electrode assembly; 221-positive electrode plate; 2211-first straight section; 2211a-first pole ear; 2211b-second hollow area; 2212-first bending section; 2212a-first blank area; 2212b-second notch; 2213-first current collector; 2214-first active material layer; 2214a-first through hole; 222-negative electrode plate; 2221-second straight section; 2221a-first hollow area; 2221b-second pole ear; 2222-second bending section; 2222a-first notch; 2222b -second blank area; 2223-second current collector; 2224-second active material layer; 2224a-second through hole; 223-first pole ear; 224-second pole ear; 225-isolation membrane; 2251-third
  • 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.
  • battery cells may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-ion batteries, or magnesium-ion batteries, etc., and the embodiments of the present application do not limit this.
  • Battery cells may be cylindrical, flat, rectangular, or in other shapes, etc., and the embodiments of the present application do not limit this.
  • Battery cells are generally divided into three types according to the packaging method: cylindrical battery cells, square battery cells, and soft-pack battery cells, and the embodiments of the present application do not limit this.
  • the battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity.
  • the battery mentioned in the present application may include a battery module or a battery pack.
  • the battery generally includes a box for encapsulating one or more battery cells or multiple battery modules. The box can prevent liquid or other foreign matter from affecting the charging or discharging of the battery cells.
  • the battery cell includes a shell, an electrode assembly and an electrolyte, and the shell is used to contain the electrode assembly and the electrolyte.
  • the electrode assembly is composed of a positive electrode sheet, a negative electrode sheet and a separator.
  • the battery cell mainly relies on the movement of metal ions between the positive electrode sheet and the negative electrode sheet to work.
  • the positive electrode sheet includes a positive electrode collector and a positive electrode active material layer, the positive electrode active material layer is coated on the surface of the positive electrode collector, and the part of the positive electrode collector that is not coated with the positive electrode active material layer is used as a positive electrode ear to realize the input or output of the electric energy of the positive electrode sheet through the positive electrode ear.
  • the material of the positive electrode collector can be aluminum, and the positive electrode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganese oxide.
  • the negative electrode sheet includes a negative electrode collector and a negative electrode active material layer, the negative electrode active material layer is coated on the surface of the negative electrode collector, and the part of the negative electrode collector that is not coated with the negative electrode active material layer is used as a negative electrode ear to realize the input or output of the electric energy of the negative electrode sheet through the negative electrode ear.
  • the negative electrode current collector may be made of copper, and the negative electrode active material may be carbon or silicon, etc. In order to ensure that a large current can pass without melting, the positive electrode tabs are multiple and stacked together, and the negative electrode tabs are multiple and stacked together.
  • 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. They are an important part of the development of new energy today.
  • the battery cell is assembled into an electrode assembly (bare cell) by winding or stacking the positive electrode sheet, the negative electrode sheet, and the isolation membrane, which is then loaded into a shell and finally injected with electrolyte.
  • the performance of the electrode assembly determines the performance of the battery cell.
  • a stacked structure or a wound structure is usually formed by stacking positive electrode sheets and negative electrode sheets, and an isolation film is arranged between the positive electrode sheets and the negative electrode sheets to play the role of insulating and isolating the positive electrode sheets and the negative electrode sheets.
  • the positive electrode sheets and the negative electrode sheets are respectively cut into positive electrode sheet monomers and negative electrode sheet monomers of preset sizes, and then the positive electrode sheet monomers and the negative electrode sheet monomers are alternately stacked in sequence, or the positive electrode sheets and the negative electrode sheets are stacked together, and then the positive electrode sheets and the negative electrode sheets are bent and stacked in sequence in a "Z" shape, or the positive electrode sheets are cut into positive electrode sheet monomers, the negative electrode sheets are bent and stacked in a "Z" shape, and the positive electrode sheet monomers are inserted into the negative electrode sheets to realize the manufacture of laminated electrode assemblies.
  • the positive electrode sheets and the negative electrode sheets are stacked together and then wound to realize the manufacture of a wound electrode assembly.
  • the positive and negative electrode plates are often misaligned, resulting in poor manufacturing accuracy of the electrode assembly, which can easily lead to low production quality of the electrode assembly and is not conducive to improving the performance of the electrode assembly.
  • the inventors have designed an electrode assembly after in-depth research, and the electrode assembly includes a positive electrode sheet and a negative electrode sheet.
  • the positive electrode sheet has a first bending section and a plurality of first straight sections, and each two adjacent first straight sections are connected by a first bending section.
  • the negative electrode sheet has a second bending section and a plurality of second straight sections, and each two adjacent second straight sections are connected by a second bending section.
  • the first straight section and the second straight section are alternately stacked along the first direction, along the second direction, the first bending section is located at one end of the first straight section, and along the third direction, the second bending section is located at one end of the second straight section, and the first direction, the second direction and the third direction are perpendicular to each other.
  • a positive electrode sheet in the electrode assembly is formed with a first bent section and a plurality of first straight sections
  • a negative electrode sheet in the electrode assembly is formed with a second bent section and a plurality of second straight sections.
  • the first straight section of the positive electrode sheet and the second straight section of the negative electrode sheet are alternately stacked along a first direction, and a first bent section connecting two adjacent first straight sections is arranged at one end of the first straight section along a second direction, and a second bent section connecting two adjacent second straight sections is arranged at one end of the second straight section along a third direction, so that the positive electrode sheet and the negative electrode sheet are a stacked structure formed by mutually cross-winding, so that at least one side of the electrode assembly in the second direction only has the first bent section of the positive electrode sheet, and at least one side in the third direction only has the second bent section of the negative electrode sheet.
  • An electrode assembly using this structure can effectively alleviate the phenomenon of misalignment of the positive electrode sheet and the negative electrode sheet during the production process, so as to improve the manufacturing accuracy of the electrode assembly, thereby effectively improving the production quality of the electrode assembly, which is beneficial to improving the performance of the electrode assembly.
  • the electrode assembly disclosed in the embodiment of the present application can be used, but not limited to, in electrical devices such as vehicles, ships or aircraft.
  • a power supply system comprising the battery cells and batteries disclosed in the present application can be used to form the electrical device, so that the production quality of the electrode assembly can be effectively improved to improve the performance of the electrode assembly.
  • 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, for example, a game console, an electric car toy, an electric ship toy, an electric airplane toy, etc.
  • the spacecraft may include an airplane, a rocket, a space shuttle, 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, head or 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 for the vehicle 1000.
  • 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 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.
  • FIG. 2 is an exploded view of the structure of the battery 100 provided in some embodiments of the present application.
  • the battery 100 includes a box body 10 and a battery cell 20, and the battery cell 20 is used to be accommodated in the box body 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, and 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, and the first box body 11 can be a plate-like structure.
  • 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 the 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 various shapes, such as a cylinder, a cuboid, etc.
  • the battery 100 there may be multiple battery cells 20, and 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 is accommodated in the box 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 box 10.
  • the battery 100 may also include other structures, for example, the battery 100 may also include a busbar component for realizing 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 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 rectangular structure.
  • Figure 3 is a schematic diagram of the structure of a battery cell 20 provided in some embodiments of the present application
  • Figure 4 is an exploded diagram of the structure of a battery cell 20 provided in some embodiments of the present application.
  • the battery cell 20 includes a housing 21 and an electrode assembly 22, and the housing 21 is used to accommodate the electrode assembly 22.
  • the housing 21 can also be used to contain electrolyte, such as electrolyte.
  • the housing 21 can be in various structural forms.
  • the housing 21 can also be made of various materials, such as copper, iron, aluminum, steel, aluminum alloy, etc.
  • the housing 21 may include a shell 211 and an end cap 212, wherein the shell 211 is formed with an opening 2111 on one side in the first direction X, and the electrode assembly 22 is accommodated in the shell 211, 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, wherein the first direction X is also the thickness direction of the end cap 212.
  • 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, and then the end cap 212 may be closed on the opening 2111 of the housing 211 .
  • 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 cylindrical structure can be selected; if the electrode assembly 22 is a cuboid structure, 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 cuboid structure, and correspondingly, the shell 211 is a cuboid structure, the end cap 212 is a rectangular 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 electrode assembly 22 is a component in the battery cell 20 where an electrochemical reaction occurs.
  • the electrode assembly 22 is mainly composed of two pole pieces with opposite polarities, and works by the movement of metal ions between the two pole pieces with opposite polarities.
  • the electrode assembly 22 can be a wound structure formed by winding two pole pieces with opposite polarities, or a laminated structure formed by stacking two pole pieces with opposite polarities.
  • FIG. 5 is a schematic diagram of the structure of the electrode assembly 22 provided in some embodiments of the present application
  • FIG. 6 is a cross-sectional view of the electrode assembly 22 provided in some embodiments of the present application perpendicular to the third direction Z
  • FIG. 7 is a cross-sectional view of the electrode assembly 22 provided in some embodiments of the present application perpendicular to the second direction Y.
  • the present application provides an electrode assembly 22, and the electrode assembly 22 includes a positive electrode sheet 221 and a negative electrode sheet 222.
  • the positive electrode sheet 221 has a first bending section 2212 and a plurality of first straight sections 2211, and each adjacent two first straight sections 2211 are connected by the first bending section 2212.
  • the negative electrode sheet 222 has a second bending section 2222 and a plurality of second straight sections 2221, and each adjacent two second straight sections 2221 are connected by the second bending section 2222.
  • the first straight section 2211 and the second straight section 2221 are alternately stacked along the first direction X.
  • the first bent section 2212 is located at one end of the first straight section 2211.
  • the second bent section 2222 is located at one end of the second straight section 2221.
  • the first direction X, the second direction Y and the third direction Z are perpendicular to each other.
  • the first straight section 2211 of the positive electrode sheet 221 is the area where the positive electrode sheet 221 and the negative electrode sheet 222 are stacked on each other in the first direction X
  • the first bent section 2212 of the positive electrode sheet 221 is the area where the positive electrode sheet 221 connects two adjacent first straight sections 2211 and is located on one side of the electrode assembly 22 in the second direction Y.
  • the positive electrode sheet 221 is a winding structure wound around an axis extending in the third direction Z or a "Z"-shaped structure formed by folding back and forth in the second direction Y.
  • the positive electrode sheet 221 is a winding structure wound around an axis extending in the third direction Z.
  • the first bending section 2212 of the positive electrode sheet 221 may be one or more. If the first bending section 2212 of the positive electrode sheet 221 is one, then the first straight sections 2211 are two; if the first bending section 2212 of the positive electrode sheet 221 is multiple, then the number of the first straight sections 2211 is the number of the first bending sections 2212 plus one, and the first bending sections 2212 are respectively formed on both sides of the electrode assembly 22 in the second direction Y. Exemplarily, in FIG6 , the first bending section 2212 of the positive electrode sheet 221 is multiple.
  • the second straight section 2221 of the negative electrode sheet 222 is the region where the negative electrode sheet 222 is stacked with the positive electrode sheet 221 in the first direction X
  • the second bent section 2222 of the negative electrode sheet 222 is the region where the negative electrode sheet 222 connects two adjacent second straight sections 2221 and is located on one side of the electrode assembly 22 in the third direction Z
  • the negative electrode sheet 222 is a winding structure wound around an axis extending in the second direction Y or a "Z"-shaped structure formed by folding back and forth in the third direction Z.
  • the negative electrode sheet 222 is a winding structure wound around an axis extending in the second direction Y.
  • the second bending section 2222 of the negative electrode plate 222 may be one or more. If the second bending section 2222 of the negative electrode plate 222 is one, then the second straight section 2221 is two; if the second bending section 2222 of the negative electrode plate 222 is multiple, then the number of the second straight sections 2221 is the number of the second bending sections 2222 plus one, and the second bending sections 2222 are respectively formed on both sides of the electrode assembly 22 in the third direction Z. Exemplarily, in FIG7 , the second bending section 2222 of the negative electrode plate 222 is multiple.
  • the first straight segments 2211 and the second straight segments 2221 are alternately stacked along the first direction X, that is, in the first direction X, the first straight segments 2211 and the second straight segments 2221 are stacked, and a second straight segment 2221 is arranged between two adjacent first straight segments 2211, and a first straight segment 2211 is also arranged between two adjacent second straight segments 2221.
  • the first bent section 2212 is located at one end of the first straight section 2211
  • the second bent section 2222 is located at one end of the second straight section 2221, that is, the first bent section 2212 of the positive electrode sheet 221 and the second bent section 2222 of the negative electrode sheet 222 are respectively located on both sides of the electrode assembly 22 in two directions perpendicular to the first direction X.
  • first direction X is the thickness direction of the first straight section 2211 of the positive electrode sheet 221 , the thickness direction of the second straight section 2221 of the negative electrode sheet 222 , and the thickness direction of the electrode assembly 22 .
  • the positive electrode sheet 221 in the electrode assembly 22 is formed with a first bent section 2212 and a plurality of first straight sections 2211
  • the negative electrode sheet 222 in the electrode assembly 22 is formed with a second bent section 2222 and a plurality of second straight sections 2221, by alternately stacking the first straight section 2211 of the positive electrode sheet 221 and the second straight section 2221 of the negative electrode sheet 222 along the first direction X, and arranging the first bent section 2212 connecting two adjacent first straight sections 2211 at one end of the first straight section 2211 along the second direction Y, and arranging the second bent section 2222 connecting two adjacent second straight sections 2221 along the third direction Z at the second straight section
  • One end of 2221 is formed so that the positive electrode sheet 221 and the negative electrode sheet 222 are cross-wound to form a stacked structure, so that at least one side of the electrode assembly 22 in the second direction Y only has a first bending section 2212 of the positive electrode sheet 221, and at least one side in the third direction Z only has a second
  • the electrode assembly 22 with such a structure can effectively alleviate the misalignment of the positive electrode sheet 221 and the negative electrode sheet 222 during the production process, so as to improve the manufacturing accuracy of the electrode assembly 22, and further can effectively improve the production quality of the electrode assembly 22, which is beneficial to improving the performance of the electrode assembly 22.
  • At least one side of the electrode assembly 22 is formed with a plurality of first bending segments 2212 , and the plurality of first bending segments 2212 are stacked along the second direction Y.
  • first bending sections 2212 are formed on at least one side of the electrode assembly 22, that is, the electrode assembly 22 can be formed with a first bending section 2212 on one side in the second direction Y and two first bending sections 2212 on the other side, or multiple first bending sections 2212 are formed on both sides in the second direction Y.
  • a plurality of first bending segments 2212 are stacked along the second direction Y, that is, in the second direction Y, a plurality of first bending segments 2212 of the positive electrode sheet 221 are arranged along the second direction Y, so that the plurality of first bending segments 2212 of the positive electrode sheet 221 are a structure that is sequentially covered along the second direction Y, that is, the positive electrode sheet 221 is a winding structure wound around an axis extending in the third direction Z.
  • the positive electrode sheet 221 may also be a "Z"-shaped structure formed by folding back and forth in the second direction Y, so that the plurality of first bending segments 2212 formed on one side of the positive electrode sheet 221 on the electrode assembly 22 along the second direction Y are a structure that is arranged at intervals along the first direction X.
  • the electrode assembly 22 has a plurality of first bending sections 2212 stacked along the second direction Y formed on at least one side in the second direction Y, that is, the positive electrode sheet 221 is a structure that is always wound along the same direction, thereby forming a plurality of first bending sections 2212 stacked in the second direction Y.
  • the electrode assembly 22 with such a structure is easy to manufacture, and there is no need to change the winding direction of the positive electrode sheet 221 during the processing of the electrode assembly 22, thereby facilitating the control of the tension of the positive electrode sheet 221, which can effectively reduce the phenomenon of wrinkles on the positive electrode sheet 221 and is beneficial to improving the production efficiency of the electrode assembly 22.
  • a plurality of first bending segments 2212 are formed on both sides of the electrode assembly 22. That is, in the second direction Y, a plurality of first bending segments 2212 arranged along the second direction Y are formed on both sides of the electrode assembly 22, that is, both sides of the electrode assembly 22 in the second direction Y have a plurality of first bending segments 2212 stacked along the second direction Y.
  • the electrode assembly 22 is formed with a plurality of first bent sections 2212 on both sides in the second direction Y, so that the positive electrode plate 221 is formed with a plurality of first straight sections 2211 , which is beneficial to improving the capacitance of the electrode assembly 22 .
  • a plurality of second bending segments 2222 are formed on at least one side of the electrode assembly 22 , and the plurality of second bending segments 2222 are stacked along the third direction Z.
  • multiple second bending sections 2222 are formed on at least one side of the electrode assembly 22, that is, the electrode assembly 22 can be formed with a second bending section 2222 on one side in the third direction Z and two second bending sections 2222 on the other side, or multiple second bending sections 2222 are formed on both sides in the third direction Z.
  • Multiple second bending segments 2222 are stacked along the third direction Z, that is, in the third direction Z, the multiple second bending segments 2222 of the negative electrode sheet 222 are arranged along the third direction Z, so that the multiple second bending segments 2222 of the negative electrode sheet 222 are a structure that covers sequentially along the third direction Z, that is, the negative electrode sheet 222 is a winding structure wound around the axis extending in the second direction Y.
  • the negative electrode sheet 222 can also be a "Z"-shaped structure formed by folding back and forth in the third direction Z, so that the multiple second bending segments 2222 formed on one side of the negative electrode sheet 222 on the electrode assembly 22 along the third direction Z are a structure arranged at intervals along the first direction X.
  • At least one side of the electrode assembly 22 in the third direction Z is formed with a plurality of second bending sections 2222 stacked along the third direction Z, that is, the negative electrode sheet 222 is a structure that is always wound along the same direction, thereby forming a plurality of second bending sections 2222 stacked in the third direction Z.
  • the electrode assembly 22 with such a structure is easy to manufacture, and there is no need to change the winding direction of the negative electrode sheet 222 during the processing of the electrode assembly 22, thereby facilitating the control of the tension of the negative electrode sheet 222, which can effectively reduce the wrinkling phenomenon of the negative electrode sheet 222 and is beneficial to improving the production efficiency of the electrode assembly 22.
  • a plurality of second bending segments 2222 are formed on both sides of the electrode assembly 22. That is, in the second direction Y, a plurality of first bending segments 2212 arranged along the second direction Y are formed on both sides of the electrode assembly 22, that is, both sides of the electrode assembly 22 in the second direction Y have a plurality of first bending segments 2212 stacked along the second direction Y.
  • the electrode assembly 22 is formed with a plurality of second bent sections 2222 on both sides in the third direction Z, so that the negative electrode plate 222 can be formed with a plurality of second straight sections 2221 , which is beneficial to improving the capacitance of the electrode assembly 22 .
  • FIG. 8 is a schematic diagram of the structure of the electrode assembly 22 provided in some embodiments of the present application during the assembly process
  • FIG. 9 is a schematic diagram of the partial structure of the positive electrode sheet 221 of the electrode assembly 22 provided in some embodiments of the present application after being unfolded
  • FIG. 10 is a schematic diagram of the partial structure of the negative electrode sheet 222 of the electrode assembly 22 provided in some embodiments of the present application after being unfolded.
  • the first straight section 2211 has a first pole ear portion 2211a, and along the first direction X, the first pole ear portions 2211a of the plurality of first straight sections 2211 are stacked and connected to form a first pole ear 223.
  • the second straight section 2221 is formed with a first hollow area 2221a at a position toward the first pole ear portion 2211a.
  • the first straight section 2211 has a first pole ear portion 2211a, that is, an area for electrical connection with other components is formed on the first straight section 2211 of the positive electrode plate 221, and the area is the first pole ear portion 2211a of the positive electrode plate 221, so that multiple first pole ear portions 2211a can form the first pole ear 223 of the electrode assembly 22 after being stacked and connected along the first direction X.
  • the second straight section 2221 forms a first hollow area 2221a at a position toward the first pole ear portion 2211a, that is, in the first direction X, the second straight section 2221 stacked with the first straight section 2211 forms a first hollow area 2221a at a position corresponding to the first pole ear portion 2211a of the first straight section 2211, and the first hollow area 2221a runs through both sides of the second straight section 2221 along the first direction X, so as to avoid the first pole ear portion 2211a.
  • the first pole ear portion 2211a on each first straight section 2211 of the positive pole piece 221 is arranged at intervals along the extension direction of the positive pole piece 221, and correspondingly, the first hollow area 2221a provided on the second straight section 2221 of the negative pole piece 222 is provided in one-to-one correspondence with the first pole ear portion 2211a, so that the first hollow area 2221a on each second straight section 2221 correspondingly avoids one first pole ear portion 2211a.
  • the two first hollow areas 2221a on two adjacent second straight sections 2221 may also be connected to each other in the extension direction of the negative pole piece 222.
  • the first straight section 2211 has a first pole ear portion 2211a, and the first pole ear portions 2211a of the plurality of first straight sections 2211 are stacked and connected to form a first pole ear 223 for outputting or inputting the positive electrode of the electrode assembly 22.
  • the first pole ear portion 2211a with such a structure does not need to be turned over, which is beneficial to improving the service life of the first pole ear portion 2211a and the production efficiency of the electrode assembly 22.
  • the first hollow area 2221a can avoid the first pole ear portion 2211a, so as to reduce the risk of short circuit between the positive pole piece 221 and the negative pole piece 222, and can reduce the difficulty of assembling the plurality of first pole ear portions 2211a stacked and connected.
  • FIG. 9 is a cross-sectional view of the first straight section 2211 of the positive electrode sheet 221 of the electrode assembly 22 provided in some embodiments of the present application.
  • the positive electrode sheet 221 includes a first current collector 2213 and a first active material layer 2214.
  • the first active material layer 2214 is coated on at least one side of the first current collector 2213.
  • the first active material layer 2214 is located in the area of the first straight section 2211 and is provided with a first through hole 2214a, and the first through hole 2214a penetrates the first active material layer 2214 along the first direction X, and the first current collector 2213 forms a first pole ear portion 2211a in the area opposite to the first through hole 2214a.
  • the first active material layer 2214 is arranged on at least one side of the first current collector 2213, that is, the first current collector 2213 can be provided with the first active material layer 2214 on one side or on both sides.
  • the first active material layer 2214 is provided on both sides of the first current collector 2213.
  • the first active material layer 2214 is provided with a first through hole 2214a, and the first through hole 2214a penetrates the first active material layer 2214 along the first direction X, that is, the first active material layer 2214 is provided with a first through hole 2214a penetrating both sides of the first active material layer 2214 along the first direction X, so that the first through hole 2214a can expose a local area of the first current collector 2213.
  • the first electrode lug 2211 a is formed in the area of the first current collector 2213 facing the first through hole 2214 a , that is, the first electrode lug 2211 a is formed in the area of the first current collector 2213 not coated with the first active material layer 2214 .
  • the first pole ear portion 2211a is the portion of the first through hole 2214a of the first active material layer 2214 on the first straight section 2211 corresponding to the first current collector 2213, that is, the area of the first current collector 2213 located in the first straight section 2211 that does not cover the first active material layer 2214 at the first through hole 2214a corresponding to the first active material layer 2214 is the first pole ear portion 2211a, so as to realize the structure in which the first pole ear portion 2211a is built-in.
  • the first pole ear portion 2211a with such a structure is beneficial to improving the flow area between the first pole ear portion 2211a and the first current collector 2213 and can reduce the internal resistance of the electrode assembly 22.
  • the first pole ear portion 2211a can be formed without cutting the first current collector 2213, which is beneficial to optimizing the production rhythm of the electrode assembly 22 to improve production efficiency.
  • the first pole ear portion 2211 a is located at the edge of the first straight segment 2211 in the second direction Y and the third direction Z.
  • the first pole ear portion 2211a is located at the edge of the first straight segment 2211 in the second direction Y and the third direction Z, that is, the first pole ear portion 2211a is located at the junction of the edge of the first straight segment 2211 in the second direction Y and the edge in the third direction Z, or the first through hole 2214a of the first active material layer 2214 is located at the junction of the edge of the first straight segment 2211 in the second direction Y and the edge in the third direction Z, that is, the first pole ear portion 2211a is located at the corner of the first straight segment 2211.
  • the first pole ear portion 2211a may also be disposed at the edge of the first straight segment 2211 in the second direction Y or the edge of the third direction Z, or may be disposed in the middle position of the first straight segment 2211 .
  • first pole ear portion 2211 a By arranging the first pole ear portion 2211 a at the edge of the first straight section 2211 in the second direction Y and the third direction Z, it is possible to facilitate subsequent stacking and assembly connection of the first pole ear portion 2211 a, thereby reducing the manufacturing difficulty of the electrode assembly 22 .
  • FIG. 12 is a schematic diagram of the structure of the electrode assembly 22 provided in some other embodiments of the present application
  • FIG. 13 is a schematic diagram of the structure of the electrode assembly 22 provided in some other embodiments of the present application during the assembly process
  • FIG. 14 is a schematic diagram of the partial structure of the positive electrode sheet 221 of the electrode assembly 22 provided in some other embodiments of the present application after unfolding.
  • the positive electrode sheet 221 includes a first current collector 2213 and a first active material layer 2214, and the first active material layer 2214 is coated on at least one side of the first current collector 2213.
  • the first current collector 2213 is located in the area of the first bending section 2212, and a first blank area 2212a not coated with the first active material layer 2214 is formed.
  • the first current collector 2213 is located in the region of the first bending section 2212 and has a first blank area 2212a that is not coated with the first active material layer 2214, that is, the first bending section 2212 located between two adjacent first straight sections 2211 has an area that is not coated with the first active material layer 2214, and this area is the first blank area 2212a.
  • the first blank area 2212a connects the two first pole ear portions 2211a of the two adjacent first straight sections 2211.
  • first bending section 2212 only a partial area on the first bending section 2212 is not coated with the first active material layer 2214.
  • the entire first bending section 2212 may not be coated with the first active material layer 2214, that is, the first bending section 2212 only has the first current collector 2213, which is beneficial to reduce the risk of lithium deposition in the first bending section 2212.
  • the second bending section 2222 located between the two first hollow areas 2221a of the two adjacent second straight sections 2221 is formed with a first notch 2222a, so that the two first hollow areas 2221a of the two adjacent second straight sections 2221 are interconnected in the extension direction of the negative electrode sheet 222, so as to facilitate processing and manufacturing, and help reduce the difficulty of processing.
  • the first notch 2222a may not be set on the second bending section 2222, and the first hollow areas 2221a on the second straight section 2221 of the negative electrode sheet 222 only need to be spaced along the extension direction of the negative electrode sheet 222, so that the first hollow areas 2221a and the first pole ear portions 2211a are set one-to-one.
  • the first bent section 2212 By providing a first blank area 2212a not coated with the first active material layer 2214 on the first bent section 2212 between two adjacent first straight sections 2211, since the first bent section 2212 does not have a corresponding negative electrode sheet 222, the first bent section 2212 will not participate in the chemical reaction. Thus, the electrode assembly 22 using such a structure is conducive to reducing the waste of the first active material layer 2214, thereby reducing the manufacturing cost of the electrode assembly 22. On the other hand, it is convenient to assemble the first bent section 2212 after bending, and is conducive to alleviating the phenomenon of the first active material layer 2214 falling off.
  • the first blank area 2212a can connect the first pole ear portions 2211a of the two adjacent first straight sections 2211.
  • This structure is convenient for manufacturing, and there is no need to provide a structure in which the first pole ear portions 2211a of the two adjacent first straight sections 2211 are arranged in an interval arrangement. This is conducive to controlling the manufacturing accuracy and reducing the manufacturing difficulty, thereby effectively improving the production quality and production efficiency of the electrode assembly 22.
  • the second straight segment 2221 has a second pole ear portion 2221b, and along the first direction X, the second pole ear portions 2221b of a plurality of second straight segments 2221 are stacked and connected to form a second pole ear 224.
  • a second hollow region 2211b is formed at a position of the first straight segment 2211 toward the second pole ear portion 2221b.
  • the second straight section 2221 has a second pole ear portion 2221b, that is, an area for electrical connection with other components is formed on the second straight section 2221 of the negative electrode plate 222, and the area is the second pole ear portion 2221b of the negative electrode plate 222, so that multiple second pole ear portions 2221b can form the second pole ear 224 of the electrode assembly 22 after being stacked and connected along the first direction X.
  • a second hollow area 2211b is formed at a position of the first straight section 2211 toward the second pole ear portion 2221b, that is, in the first direction X, the first straight section 2211 stacked with the second straight section 2221 is formed with a second hollow area 2211b at a position corresponding to the second pole ear portion 2221b of the second straight section 2221, and the second hollow area 2211b runs through both sides of the first straight section 2211 along the first direction X, so as to avoid the second pole ear portion 2221b.
  • the second pole ear portion 2221b on each second straight section 2221 of the negative pole piece 222 is arranged at intervals along the extension direction of the negative pole piece 222, and correspondingly, the second hollow area 2211b and the second pole ear portion 2221b provided on the first straight section 2211 of the positive pole piece 221 are provided in a one-to-one correspondence, so that the second hollow area 2211b on each first straight section 2211 correspondingly avoids one second pole ear portion 2221b.
  • the two second hollow areas 2211b on two adjacent first straight sections 2211 may also be connected to each other in the extension direction of the positive pole piece 221.
  • the second straight section 2221 has a second pole ear portion 2221b, and the second pole ear portions 2221b of the plurality of second straight sections 2221 are stacked and connected to form a second pole ear 224 for outputting or inputting the negative electrode of the electrode assembly 22.
  • the second pole ear portion 2221b with such a structure does not need to be turned over, which is beneficial to improving the service life of the second pole ear portion 2221b and the production efficiency of the electrode assembly 22.
  • the second hollow area 2211b can avoid the second pole ear portion 2221b, so as to reduce the risk of short circuit between the positive pole sheet 221 and the negative pole sheet 222, and can reduce the difficulty of assembling the plurality of second pole ear portions 2221b stacked and connected.
  • FIG. 10 is a cross-sectional view of the second straight section 2221 of the negative electrode plate 222 of the electrode assembly 22 provided in some embodiments of the present application.
  • the negative electrode plate 222 includes a second current collector 2223 and a second active material layer 2224.
  • the second active material layer 2224 is coated on at least one side of the second current collector 2223.
  • the second active material layer 2224 is located in the area of the second straight section 2221 and is provided with a second through hole 2224a, and the second through hole 2224a penetrates the second active material layer 2224 along the first direction X, and the second current collector 2223 is opposite to the second through hole 2224a to form a second pole ear portion 2221b.
  • the second active material layer 2224 is arranged on at least one side of the second current collector 2223, that is, the second current collector 2223 can be provided with the second active material layer 2224 on one side, or can be provided with the second active material layer 2224 on both sides.
  • the second active material layer 2224 is provided on both sides of the second current collector 2223.
  • the second active material layer 2224 is provided with second through holes 2224 a, which penetrate the second active material layer 2224 along the first direction X, that is, the second active material layer 2224 is provided with second through holes 2224 a which penetrate both sides of the second active material layer 2224 along the first direction X, so that the second through holes 2224 a can expose a local area of the second current collector 2223 .
  • the second electrode ear portion 2221 b is formed in the area of the second current collector 2223 facing the second through hole 2224 a , that is, the second electrode ear portion 2221 b is formed in the area of the second current collector 2223 not coated with the second active material layer 2224 .
  • the second pole ear portion 2221b is the portion of the second through hole 2224a of the second active material layer 2224 on the second straight section 2221 corresponding to the second current collector 2223, that is, the area of the second current collector 2223 located in the second straight section 2221 that does not cover the second active material layer 2224 at the second through hole 2224a corresponding to the second active material layer 2224 is the second pole ear portion 2221b, so as to realize the structure in which the second pole ear portion 2221b is built-in.
  • the second pole ear portion 2221b with such a structure is beneficial to improving the flow area between the second pole ear portion 2221b and the second current collector 2223 and can reduce the internal resistance of the electrode assembly 22.
  • the second pole ear portion 2221b can be formed without cutting the second current collector 2223, which is beneficial to optimizing the production rhythm of the electrode assembly 22 to improve production efficiency.
  • the second pole ear portion 2221 b is located at the edge of the second straight segment 2221 in the second direction Y and the third direction Z.
  • the second pole ear portion 2221b is located at the edge of the second straight segment 2221 in the second direction Y and the third direction Z, that is, the second pole ear portion 2221b is located at the junction of the edge of the second straight segment 2221 in the second direction Y and the edge in the third direction Z, or the second through hole 2224a of the second active material layer 2224 is located at the junction of the edge of the second straight segment 2221 in the second direction Y and the edge in the third direction Z, that is, the second pole ear portion 2221b is located at the corner of the second straight segment 2221.
  • the second pole ear portion 2221b may also be disposed at the edge of the second straight segment 2221 in the second direction Y or the edge of the third direction Z, or may be disposed in the middle position of the second straight segment 2221 .
  • the second pole ear portion 2221 b By arranging the second pole ear portion 2221 b at the edge of the second straight section 2221 in the second direction Y and the third direction Z, it is possible to facilitate the subsequent stacking and assembly connection of the second pole ear portion 2221 b, thereby reducing the manufacturing difficulty of the electrode assembly 22 .
  • the negative electrode 222 includes a second current collector 2223 and a second active material layer 2224, and the second active material layer 2224 is coated on at least one side of the second current collector 2223.
  • the second current collector 2223 is located in the second bending section 2222, and a second blank area 2222b not coated with the second active material layer 2224 is formed.
  • the second current collector 2223 is located in the area of the second bending section 2222, and a second blank area 2222b not coated with the second active material layer 2224 is formed, that is, the second bending section 2222 located between two adjacent second straight sections 2221 has an area not coated with the second active material layer 2224, and this area is the second blank area 2222b.
  • the second blank area 2222b connects the two second pole ear portions 2221b of the two adjacent second straight sections 2221.
  • the first bending section 2212 between the two second hollow areas 2211b of the two adjacent first straight sections 2211 is formed with a second notch 2212b, so that the two second hollow areas 2211b of the two adjacent first straight sections 2211 are interconnected in the extension direction of the positive electrode sheet 221, so as to facilitate processing and manufacturing, and help reduce the difficulty of processing.
  • the second notch 2212b may not be provided on the first bending section 2212, and the second hollow areas 2211b on the first straight section 2211 of the positive electrode sheet 221 only need to be spaced along the extension direction of the positive electrode sheet 221, so that the second hollow areas 2211b and the second pole ear portions 2221b are provided one-to-one.
  • the second bent section 2222 By providing a second blank area 2222b not coated with the second active material layer 2224 on the second bent section 2222 between two adjacent second straight sections 2221, since the second bent section 2222 does not have a corresponding positive electrode sheet 221, the second bent section 2222 will not participate in the chemical reaction.
  • the electrode assembly 22 using such a structure is beneficial to reducing the waste of the second active material layer 2224, thereby reducing the manufacturing cost of the electrode assembly 22.
  • the second blank area 2222b can connect the second pole ear portions 2221b of the two adjacent second straight sections 2221.
  • This structure is convenient for manufacturing, and there is no need to provide a structure in which the second pole ear portions 2221b of the two adjacent second straight sections 2221 are arranged in an interval arrangement. This is beneficial to controlling the manufacturing accuracy and reducing the manufacturing difficulty, thereby effectively improving the production quality and production efficiency of the electrode assembly 22.
  • the first straight segment 2211 has a first pole ear portion 2211a, which is located at the edge of the first straight segment 2211 in the second direction Y and the third direction Z
  • the second straight segment 2221 has a second pole ear portion 2221b, which is located at the edge of the second straight segment 2221 in the second direction Y and the third direction Z.
  • the first pole ear portion 2211a and the second pole ear portion 2221b are arranged at intervals along the second direction Y, and/or the first pole ear portion 2211a and the second pole ear portion 2221b are arranged at intervals along the third direction Z.
  • the first pole ear portion 2211 a and the second pole ear portion 2221 b are located at the corners of the first straight section 2211 and the second straight section 2221 , respectively.
  • the first pole ear portion 2211a and the second pole ear portion 2221b are spaced apart along the second direction Y, and/or the first pole ear portion 2211a and the second pole ear portion 2221b are spaced apart along the third direction Z, that is, the corner where the first pole ear portion 2211a is arranged in the first straight section 2211 and the corner where the second pole ear portion 2221b is arranged in the second direction Y and/or the third direction Z are spaced apart.
  • the first electrode ear portion 2211 a and the second electrode ear portion 2221 b are located at two diagonal portions of the electrode assembly 22 in the second direction Y and the third direction Z, respectively.
  • first pole ear portion 2211a and the second pole ear portion 2221b can also be arranged to be spaced apart only in the second direction Y or only in the third direction Z, that is, the first pole ear portion 2211a and the second pole ear portion 2221b are respectively located at two adjacent corners of the electrode assembly 22.
  • first pole ear portion 2211a and the second pole ear portion 2221b are spaced apart in the second direction Y and/or the third direction Z to increase the distance between the first pole ear portion 2211a and the second pole ear portion 2221b, on the one hand, it is helpful to reduce the risk of short circuit between the first pole ear portion 2211a and the second pole ear portion 2221b, and on the other hand, it is convenient to subsequently assemble the first pole ear portion 2211a and the second pole ear portion 2221b with other components respectively, thereby reducing the interference between them.
  • the electrode assembly 22 further includes an isolation membrane 225 , which is disposed between the positive electrode sheet 221 and the negative electrode sheet 222 to separate the positive electrode sheet 221 and the negative electrode sheet 222 .
  • the isolation film 225 serves to separate the positive electrode sheet 221 from the negative electrode sheet 222 , so as to achieve insulation isolation between the positive electrode sheet 221 and the negative electrode sheet 222 .
  • the material of the isolation film 225 may be polypropylene (PP) or polyethylene (PE).
  • the electrode assembly 22 is also provided with an isolation membrane 225.
  • an isolation membrane 225 By setting the isolation membrane 225 between the positive electrode plate 221 and the negative electrode plate 222, the positive electrode plate 221 and the negative electrode plate 222 are separated, thereby reducing the short circuit phenomenon between the positive electrode plate 221 and the negative electrode plate 222, which is beneficial to reducing the safety hazard of the electrode assembly 22 during use.
  • FIG. 17 is a schematic diagram of the structure of the isolation film 225 of the electrode assembly 22 provided in some embodiments of the present application.
  • the first straight section 2211 has a first pole ear portion 2211a
  • the second straight section 2221 has a second pole ear portion 2221b.
  • a third hollow area 2251 is formed at a position of the isolation film 225 opposite to the first pole ear portion 2211a
  • a fourth hollow area 2252 is formed at a position of the isolation film 225 opposite to the second pole ear portion 2221b.
  • a third hollow area 2251 is formed at the position corresponding to the isolation membrane 225 and the first pole ear portion 2211a, that is, the isolation membrane 225 is stacked with the first straight section 2211 of the positive electrode plate 221 in the first direction X and a third hollow area 2251 is formed at the position corresponding to the first pole ear portion 2211a of the first straight section 2211.
  • the third hollow area 2251 runs through both sides of the isolation membrane 225 along the first direction X, so as to avoid the first pole ear portion 2211a.
  • a fourth hollow area 2252 is formed at a position corresponding to the isolation membrane 225 and the second pole ear portion 2221b, that is, the isolation membrane 225 is stacked with the second straight section 2221 of the negative electrode plate 222 in the first direction X and a fourth hollow area 2252 is formed at a position corresponding to the second pole ear portion 2221b of the second straight section 2221.
  • the fourth hollow area 2252 runs through both sides of the isolation membrane 225 along the first direction X, thereby avoiding the second pole ear portion 2221b.
  • a plurality of third hollow areas 2251 are arranged at intervals along the extension direction of the isolation membrane 225, and the third hollow areas 2251 are arranged in a one-to-one correspondence with the first pole ear portion 2211a, so that the third hollow areas 2251 can avoid the corresponding first pole ear portion 2211a.
  • a plurality of fourth hollow areas 2252 are arranged at intervals along the extension direction of the isolation membrane 225, and the fourth hollow areas 2252 are arranged in a one-to-one correspondence with the second pole ear portion 2221b, so that the fourth hollow areas 2252 can avoid the corresponding second pole ear portion 2221b.
  • the structure of the isolation membrane 225 is not limited to this.
  • Figure 18 is a schematic diagram of the structure of the isolation membrane 225 of the electrode assembly 22 provided in some embodiments of the present application in other embodiments.
  • the two adjacent third hollow areas 2251 are interconnected, and correspondingly, the two adjacent fourth hollow areas 2252 can also be interconnected structures, which facilitates the processing and manufacturing of the isolation membrane 225, helps to reduce the difficulty of processing, and facilitates the first pole ear portion 2211a and the second pole ear portion 2221b.
  • the isolation membrane 225 can avoid the first pole ear portion 2211a and the second pole ear portion 2221b, so as to facilitate the subsequent stacking and assembly connection of the first pole ear portion 2211a and the second pole ear portion 2221b, thereby effectively reducing the blocking and interference effects of the isolation membrane 225 on the first pole ear portion 2211a and the second pole ear portion 2221b.
  • one of the two isolation films 225 is stacked with the positive electrode sheet 221 and extends along the extension direction of the positive electrode sheet 221, that is, one of the two isolation films 225 is stacked with the positive electrode sheet 221 and then wound around the axis extending along the third direction Z together with the positive electrode sheet 221.
  • the other of the two isolation films 225 is stacked with the negative electrode sheet 222 and extends along the extension direction of the negative electrode sheet 222, that is, the other of the two isolation films 225 is stacked with the negative electrode sheet 222 and then wound around the axis extending along the second direction Y together with the negative electrode sheet 222.
  • the electrode assembly 22 is provided with two isolation membranes 225, and one of the isolation membranes 225 is stacked with the positive electrode sheet 221 and then assembled together with the positive electrode sheet 221, and the other isolation membrane 225 is stacked with the negative electrode sheet 222 and then assembled together with the negative electrode sheet 222, so that the two isolation membranes 225 can cooperate to separate the positive electrode sheet 221 and the negative electrode sheet 222 after the first straight section 2211 of the positive electrode sheet 221 and the second straight section 2221 of the negative electrode sheet 222 are alternately stacked.
  • the electrode assembly 22 with such a structure is convenient for assembling the isolation membrane 225, which is beneficial to reducing the difficulty of assembling the isolation membrane 225 and can effectively ensure the separation effect between the positive electrode sheet 221 and the negative electrode sheet 222.
  • the positive electrode sheet 221 is a winding structure wound around a first axis, and the first axis extends along a third direction Z.
  • the negative electrode sheet 222 is a winding structure wound around a second axis, and the second axis extends along a second direction Y.
  • the positive electrode sheet 221 is a winding structure wound around a first axis, and the first axis extends along the third direction Z, that is, the positive electrode sheet 221 is wound around the axis extending along the third direction Z, so as to form a plurality of first bending sections 2212 stacked along the second direction Y on both sides of the electrode assembly 22 along the second direction Y.
  • the positive electrode sheet 221 is a winding structure, and the plane where the winding direction of the positive electrode sheet 221 is located is perpendicular to the third direction Z.
  • the negative electrode sheet 222 is a winding structure wound around a second axis, and the second axis extends along the second direction Y, that is, the negative electrode sheet 222 is wound around the axis extending along the second direction Y, so as to form a plurality of second bending sections 2222 stacked along the third direction Z on both sides of the electrode assembly 22 along the third direction Z.
  • the negative electrode sheet 222 is a winding structure, and the plane where the winding direction of the negative electrode sheet 222 is located is perpendicular to the second direction Y.
  • the positive electrode sheet 221 As a structure wound around a first axis extending along the third direction Z, and setting the negative electrode sheet 222 as a structure wound around a second axis extending along the second direction Y, it is possible to achieve that the first straight section 2211 of the positive electrode sheet 221 and the second straight section 2221 of the negative electrode sheet 222 can be alternately stacked in the first direction X, and the first bent section 2212 of the positive electrode sheet 221 and the second bent section 2222 of the negative electrode sheet 222 are respectively in the second direction Y and the third direction Z.
  • the electrode assembly 22 with such a structure is easy to manufacture, and there is no need to change the winding direction of the positive electrode sheet 221 and the negative electrode sheet 222 during the processing of the electrode assembly 22, so that it is easy to control the tension of the positive electrode sheet 221 and the negative electrode sheet 222, which can effectively reduce the wrinkling phenomenon of the positive electrode sheet 221 and the negative electrode sheet 222, and is conducive to improving the production efficiency of the electrode assembly 22.
  • the embodiments of the present application further provide a battery cell 20 , the battery cell 20 includes a housing 21 and an electrode assembly 22 of any of the above schemes, and the electrode assembly 22 is accommodated in the housing 21 .
  • the housing 21 may include a shell 211 and an end cap 212 .
  • An opening 2111 is formed on one side of the shell 211 along the first direction X, and the electrode assembly 22 is accommodated in the shell 211 .
  • the end cap 212 covers the opening 2111 .
  • the structure of the shell 21 can be various.
  • the shell 21 can be a hollow structure with an opening 2111 on one side, or a hollow structure with openings 2111 on both sides.
  • the shell 211 is a hollow structure with openings 2111 on both sides in the first direction X
  • the shell 21 includes two end covers 212, and the two end covers 212 respectively cover the two openings 2111 of the shell 211.
  • the housing 211 and the end cover 212 may be connected in various ways, such as welding, clamping, or bolting.
  • the assembly direction of the electrode assembly 22 into the shell 211 is the same as the stacking direction of the first straight section 2211 and the second straight section 2221, thereby facilitating the assembly of the electrode assembly 22 into the shell 211 and helping to reduce the difficulty of assembling the battery cell 20.
  • the battery cell 20 may further include a positive terminal 23 and a negative terminal 24, and the positive terminal 23 and the negative terminal 24 are insulated and installed on the end cover 212 or the shell 211.
  • the first straight section 2211 has a first pole ear portion 2211a, and along the first direction X, the first pole ear portions 2211a of the multiple first straight sections 2211 are stacked and connected to form a first pole ear 223, and the first pole ear 223 is electrically connected to the positive terminal 23.
  • the second straight section 2221 has a second pole ear portion 2221b, and along the first direction X, the second pole ear portions 2221b of the multiple second straight sections 2221 are stacked and connected to form a second pole ear 224, and the second pole ear 224 is electrically connected to the negative terminal 24.
  • the positive terminal 23 and the negative terminal 24 are insulated and installed on the end cover 212 or the shell 211, that is, the positive terminal 23 and the negative terminal 24 are installed on the end cover 212 or the shell 211, and are not electrically connected to the end cover 212 and the shell 211.
  • the positive terminal 23 and the negative terminal 24 are both insulated and mounted on the end cap 212.
  • the positive terminal 23 and the negative terminal 24 may be both mounted on the housing 211, or one of the positive terminal 23 and the negative terminal 24 may be mounted on the housing 211, and the other may be mounted on the end cap 212.
  • the positive terminal 23 and the negative terminal 24 are both used to be electrically connected to the electrode assembly 22 to achieve input or output of electrical energy of the battery cell 20.
  • the positive terminal 23 and the negative terminal 24 may be directly connected to the first pole ear 223 and the second pole ear 224 of the electrode assembly 22, respectively, for example, by welding or abutting, etc., or the positive terminal 23 and the negative terminal 24 may be indirectly connected to the first pole ear 223 and the second pole ear 224 of the electrode assembly 22, respectively, for example, the positive terminal 23 and the negative terminal 24 are respectively abutted or welded to the first pole ear 223 and the second pole ear 224 of the electrode assembly 22 through other components.
  • the battery cell 20 may further include a positive current collecting member 25 and a negative current collecting member 26, wherein the positive current collecting member 25 is disposed in the housing 21, and the positive current collecting member 25 is used to connect the first pole tab 223 of the electrode assembly 22 and the positive terminal 23, so as to realize the input or output of the positive electrode of the battery cell 20.
  • the negative current collecting member 26 is disposed in the housing 21, and the negative current collecting member 26 is used to connect the second pole tab 224 of the electrode assembly 22 and the negative terminal 24, so as to realize the input or output of the negative electrode of the battery cell 20.
  • the positive current collecting member 25 is welded to the positive terminal 23 and the first pole tab 223 of the electrode assembly 22, and the negative current collecting member 26 is welded to the negative terminal 24 and the second pole tab 224 of the electrode assembly 22.
  • the positive current collecting member 25 can also be connected to the positive terminal 23 and the first pole tab 223 of the electrode assembly 22 by abutting or clamping
  • the negative current collecting member 26 can also be connected to the negative terminal 24 and the second pole tab 224 of the electrode assembly 22 by abutting or clamping.
  • the positive electrode current collecting member 25 and the negative electrode current collecting member 26 may be made of various materials, such as copper, iron, aluminum, steel, aluminum alloy, and the like.
  • the battery cell 20 may further include a pressure relief mechanism 27, which is mounted on the end cover 212.
  • the pressure relief mechanism 27 may also be mounted on the housing 211. The pressure relief mechanism 27 is used to release the pressure inside the battery cell 20 when the internal pressure or temperature of the battery cell 20 reaches a predetermined value.
  • the pressure relief mechanism 27 may be a component such as an explosion-proof valve, an explosion-proof disk, an air valve, a pressure relief valve or a safety valve.
  • the positive terminal 23 and the negative terminal 24 can be connected to the first pole ear 223 formed by stacking multiple first pole ear portions 2211a along the first direction X, and the negative terminal 24 can be connected to the second pole ear 224 formed by stacking multiple second pole ear portions 2221b along the first direction X.
  • the battery cell 20 adopting this structure can, on the one hand, reduce the difficulty of assembling the positive terminal 23 and the first pole ear 223 and the negative terminal 24 and the second pole ear 224, which is beneficial to improving the production efficiency of the battery cell 20.
  • the positive terminal 23 and the negative terminal 24 can effectively utilize the space between the first pole ear 223 and the second pole ear 224 and the end cover 212, which is beneficial to improving the internal space utilization rate of the battery cell 20.
  • the battery cell 20 includes two electrode assemblies 22 , and the two electrode assemblies 22 are stacked along the first direction X.
  • the battery cell 20 also includes a positive electrode current collecting member 25 , and the positive electrode current collecting member 25 includes a first connecting portion 251 and a second connecting portion 252 , along the first direction X, the first connecting portion 251 is located between the two electrode assemblies 22 , and connects the first pole tabs 223 of the two electrode assemblies 22 , the second connecting portion 252 extends along the first direction X, one end of the second connecting portion 252 is connected to the first connecting portion 251 , and the other end is connected to the positive terminal 23 .
  • first connecting part 251 and the second connecting part 252 are perpendicular to each other and connected.
  • the first connecting part 251 is used to connect the first pole ears 223 of the two electrode assemblies 22, and the second connecting part 252 is used to connect the positive terminal 23 to achieve electrical connection between the two electrode assemblies 22 and the positive terminal 23.
  • the first connection portion 251 is located between the two electrode assemblies 22 and connects the first electrode tabs 223 of the two electrode assemblies 22 , that is, the first connection portion 251 is stacked between the two electrode assemblies 22 along the first direction X and connected to the first electrode tabs 223 of the two electrode assemblies 22 .
  • the positive electrode current collecting component 25 By setting the positive electrode current collecting component 25 as a first connecting portion 251 and a second connecting portion 252 which are connected to each other, and the first connecting portion 251 is set between the two electrode assemblies 22 in the first direction X, so that the first connecting portion 251 can be connected to the first pole ears 223 of the two electrode assemblies 22 at the same time, so that after the second connecting portion 252 is connected to the positive terminal 23, the first pole ears 223 of the two electrode assemblies 22 can be electrically connected to the positive terminal 23, which is beneficial to reducing the connection difficulty between the electrode assembly 22 and the positive terminal 23, and there is no need to set two positive electrode current collecting components 25 respectively connected to the two electrode assemblies 22, which is beneficial to reducing the manufacturing cost of the battery cell 20.
  • the second connection portion 252 is a sheet-like structure perpendicular to the first direction X.
  • the second connection portion 252 is a sheet-like structure perpendicular to the first direction X. That is, the thickness direction of the second connection portion 252 is consistent with the first direction X.
  • the positive electrode current collecting component 25 adopting this structure is beneficial to increase the connection area between the second connecting portion 252 and the first pole lugs 223 of the two electrode assemblies 22, thereby facilitating the connection stability and conduction area between the positive electrode current collecting component 25 and the first pole lugs 223 of the electrode assemblies 22.
  • the battery cell 20 includes two electrode assemblies 22 , and the two electrode assemblies 22 are stacked along the first direction X.
  • the battery cell 20 also includes a negative electrode current collecting member 26 , and the negative electrode current collecting member 26 includes a third connecting portion 261 and a fourth connecting portion 262 , along the first direction X, the third connecting portion 261 is located between the two electrode assemblies 22 , and connects the second pole tabs 224 of the two electrode assemblies 22 , and the fourth connecting portion 262 extends along the first direction X, one end of the fourth connecting portion 262 is connected to the third connecting portion 261 , and the other end is connected to the negative terminal 24 .
  • the third connecting part 261 and the fourth connecting part 262 are perpendicular to each other and connected.
  • the third connecting part 261 is used to connect the second pole ears 224 of the two electrode assemblies 22, and the fourth connecting part 262 is used to connect the negative terminal 24 to achieve electrical connection between the two electrode assemblies 22 and the negative terminal 24.
  • the third connection portion 261 is located between the two electrode assemblies 22 and connects the second tabs 224 of the two electrode assemblies 22 , that is, the third connection portion 261 is stacked between the two electrode assemblies 22 along the first direction X and connected to the second tabs 224 of the two electrode assemblies 22 .
  • the negative electrode current collecting component 26 By setting the negative electrode current collecting component 26 as a third connection part 261 and a fourth connection part 262 that are connected to each other, and the third connection part 261 is set between the two electrode assemblies 22 in the first direction X, so that the third connection part 261 can be connected to the second pole ears 224 of the two electrode assemblies 22 at the same time, so that after the fourth connection part 262 is connected to the negative terminal 24, the second pole ears 224 of the two electrode assemblies 22 can be electrically connected to the negative terminal 24, which is beneficial to reducing the connection difficulty between the electrode assembly 22 and the negative terminal 24, and there is no need to set two negative electrode current collecting components 26 respectively connected to the two electrode assemblies 22, which is beneficial to reducing the manufacturing cost of the battery cell 20.
  • the fourth connection portion 262 is a sheet-like structure perpendicular to the first direction X.
  • the fourth connection portion 262 is a sheet-like structure perpendicular to the first direction X. That is, the thickness direction of the fourth connection portion 262 is consistent with the first direction X.
  • the negative electrode current collecting component 26 By setting the fourth connecting portion 262 as a sheet structure perpendicular to the first direction X, that is, the fourth connecting portion 262 is laid flat between the two electrode assemblies 22, the negative electrode current collecting component 26 with such a structure is beneficial to increase the connection area between the fourth connecting portion 262 and the second pole tabs 224 of the two electrode assemblies 22, thereby facilitating the connection stability and flow conduction area between the negative electrode current collecting component 26 and the second pole tabs 224 of the electrode assemblies 22.
  • a battery 100 is further provided, and the battery 100 includes a plurality of battery cells 20 according to any of the above schemes.
  • the embodiments of the present application also provide an electrical device, which includes a battery cell 20 of any of the above schemes, and the battery cell 20 is used to provide electrical energy to the electrical device; or, the electrical device includes a battery 100 of any of the above schemes, and the battery 100 is used to provide electrical energy to the electrical device.
  • the electrical device may be any of the aforementioned devices or systems using the battery cell 20 or the battery 100 .
  • the present application provides an electrode assembly 22, which includes a positive electrode sheet 221, a negative electrode sheet 222 and two separators 225.
  • the positive electrode sheet 221 has a plurality of first bending sections 2212 and a plurality of first straight sections 2211, and each adjacent two first straight sections 2211 are connected by a first bending section 2212.
  • the negative electrode sheet 222 has a plurality of second bending sections 2222 and a plurality of second straight sections 2221, and each adjacent two second straight sections 2221 are connected by a second bending section 2222.
  • the first straight sections 2211 and the second straight sections 2221 are alternately stacked along the first direction X.
  • the first bending section 2212 is located at one end of the first straight section 2211, and a plurality of first bending sections 2212 are formed on both sides of the electrode assembly 22, and the plurality of first bending sections 2212 are stacked along the second direction Y.
  • the second bending section 2222 is located at one end of the second straight section 2221, and a plurality of second bending sections 2222 are formed on both sides of the electrode assembly 22.
  • the plurality of second bending sections 2222 are stacked along the third direction Z, so that the positive electrode sheet 221 is a winding structure wound around an axis extending along the third direction Z, and the negative electrode sheet 222 is a winding structure wound around an axis extending along the second direction Y.
  • the first direction X, the second direction Y and the third direction Z are perpendicular to each other.
  • One of the two separators 225 is stacked with the positive electrode sheet 221 and extends along the extension direction of the positive electrode sheet 221, and the other is stacked with the negative electrode sheet 222 and extends along the extension direction of the negative electrode sheet 222, so that the two separators 225 are both arranged between the positive electrode sheet 221 and the negative electrode sheet 222 to cooperate in separating the positive electrode sheet 221 and the negative electrode sheet 222.
  • the first straight section 2211 includes a first current collector 2213 and a first active material layer 2214 coated on both sides of the first current collector 2213, and a first through hole 2214a is arranged on the first active material layer 2214, and the first through hole 2214a penetrates the first active material layer 2214 along the first direction X.
  • the area of the first current collector 2213 corresponding to the first through hole 2214a forms a first pole ear portion 2211a, and along the first direction X, the first pole ear portions 2211a of multiple first straight sections 2211 are stacked and connected to form a first pole ear 223.
  • the second straight section 2221 includes a second current collector 2223 and a second active material layer 2224 coated on both sides of the second current collector 2223.
  • the second active material layer 2224 is provided with a second through hole 2224a, which penetrates the second active material layer 2224 along the first direction X.
  • the second current collector 2223 forms a second pole ear portion 2221b in the region corresponding to the second through hole 2224a.
  • a plurality of second pole ear portions 2221b of the second straight sections 2221 are stacked and connected to form the second pole ear 224.
  • the first pole ear portion 2211a and the second pole ear portion 2221b are located at the edges of the first straight section 2211 and the second straight section 2221 in the second direction Y and the third direction Z, respectively, and the first pole ear portion 2211a and the second pole ear portion 2221b are spaced apart in the second direction Y and the third direction Z.
  • the position of the second straight section 2221 corresponding to the first pole ear portion 2211a forms a first hollow area 2221a, and the first hollow area 2221a is used to avoid the first pole ear portion 2211a.
  • the position of the first straight section 2211 corresponding to the second pole ear portion 2221b forms a second hollow area 2211b, and the second hollow area 2211b is used to avoid the second pole ear portion 2221b.
  • the isolation film 225 forms a third hollow area 2251 at a position corresponding to the first pole ear portion 2211a, and the isolation film 225 forms a fourth hollow area 2252 at a position corresponding to the second pole ear portion 2221b.
  • the third hollow area 2251 and the fourth hollow area 2252 are used to avoid the first pole ear portion 2211a and the second pole ear portion 2221b, respectively.
  • the present application also provides a method for manufacturing an electrode assembly 22, referring to FIG. 19, which is a schematic flow chart of a method for manufacturing an electrode assembly 22 provided in some embodiments of the present application, the manufacturing method comprising:
  • S200 Alternately wind the positive electrode sheet 221 and the negative electrode sheet 222, so that the positive electrode sheet 221 forms a first bent section 2212 and a plurality of first straight sections 2211, and each adjacent two first straight sections 2211 are connected by the first bent section 2212; and the negative electrode sheet 222 forms a second bent section 2222 and a plurality of second straight sections 2221, and each adjacent two second straight sections 2221 are connected by the second bent section 2222.
  • the first straight section 2211 and the second straight section 2221 are alternately stacked along the first direction X, along the second direction Y, the first bent section 2212 is located at one end of the first straight section 2211, along the third direction Z, the second bent section 2222 is located at one end of the second straight section 2221, and the first direction X, the second direction Y and the third direction Z are perpendicular to each other.
  • step S200 when the positive electrode sheet 221 and the negative electrode sheet 222 are alternately wound, it is necessary to first stack the winding starting end of the positive electrode sheet 221 and the winding starting end of the negative electrode sheet 222 along the first direction X, and make the extension direction of the positive electrode sheet 221 and the extension direction of the negative electrode sheet 222 perpendicular to each other, that is, the positive electrode sheet 221 extends along the second direction Y, and the negative electrode sheet 222 extends along the third direction Z, and then the positive electrode sheet 221 and the negative electrode sheet 222 are alternately wound in sequence, so that the electrode assembly 22 has multiple first bending sections 2212 stacked along the second direction Y on both sides of the second direction Y, and the electrode assembly 22 has multiple second bending sections 2222 stacked along the third direction Z on both sides of the third direction Z.
  • the manufacturing method of the electrode assembly 22 is to alternately wind the positive electrode sheet 221 and the negative electrode sheet 222 so that the first straight section 2211 of the positive electrode sheet 221 and the second straight section 2221 of the negative electrode sheet 222 are alternately stacked along the first direction X, and the first bent section 2212 connecting the two adjacent first straight sections 2211 is arranged at one end of the first straight section 2211 along the second direction Y, and the second bent section 2222 connecting the two adjacent second straight sections 2221 is arranged at one end of the second straight section 2221 along the third direction Z, so that the positive electrode sheet 221 and the negative electrode sheet 222 are cross-wound to form a stacked structure, that is, the positive electrode sheet 221 is wound
  • the winding structure is wound around the axis extending in the third direction Z
  • the negative electrode sheet 222 is formed as a winding structure wound around the axis extending in the second direction Y.
  • the electrode assembly 22 formed by this manufacturing method can, on the one hand, effectively alleviate the phenomenon of misalignment between the positive electrode sheet 221 and the negative electrode sheet 222 during the production process, so as to improve the manufacturing accuracy of the electrode assembly 22, thereby effectively improving the production quality of the electrode assembly 22.
  • FIG. 20 is a schematic flow chart of a method for manufacturing an electrode assembly 22 provided in some other embodiments of the present application.
  • the method for manufacturing the electrode assembly 22 further includes:
  • step S200 alternately winding the positive electrode sheet 221 and the negative electrode sheet 222
  • the method for manufacturing the electrode assembly 22 further includes:
  • step S400 one of the two isolation films 225 is stacked with the positive electrode sheet 221 and extended along the extension direction of the positive electrode sheet 221, that is, before the positive electrode sheet 221 is wound, one isolation film 225 and the positive electrode sheet 221 are stacked with each other along the first direction X, and the extension direction of the isolation film 225 is the same as the extension direction of the positive electrode sheet 221, that is, before the positive electrode sheet 221 is wound, the isolation film 225 covers the positive electrode sheet 221 along the first direction X.
  • step S500 the other isolation film 225 of the two isolation films 225 is stacked with the negative electrode sheet 222 and extended along the extension direction of the negative electrode sheet 222, that is, before the negative electrode sheet 222 is wound, one isolation film 225 and the negative electrode sheet 222 are stacked with each other along the first direction X, and the extension direction of the isolation film 225 is the same as the extension direction of the negative electrode sheet 222, that is, before the negative electrode sheet 222 is wound, the isolation film 225 covers the positive electrode sheet 221 along the first direction X.
  • step S300 is provided after step S100 .
  • step S300 may also be provided before step S100 .
  • step S500 is arranged after step S400.
  • step S500 may be before step S400, as long as both step S400 and step S500 are after step S300.
  • the two isolation films 225 are first stacked with the positive electrode sheet 221 and the negative electrode sheet 222 respectively, so that the two isolation films 225 are wound along with the positive electrode sheet 221 and the negative electrode sheet 222 respectively, so that the two isolation films 225 are stacked on both sides of the first straight section 2211 of the positive electrode sheet 221 and both sides of the second straight section 2221 of the negative electrode sheet 222 in the first direction X, so that the two isolation films 225 can effectively separate the positive electrode sheet 221 and the negative electrode sheet 222 to reduce the risk of short circuit between the positive electrode sheet 221 and the negative electrode sheet 222.
  • This manufacturing method facilitates the assembly of the isolation film 225 between the positive electrode sheet 221 and the negative electrode sheet 222, which is beneficial to reducing the difficulty of assembling the isolation film 225 and can effectively ensure the separation effect between the positive electrode sheet 221 and the negative electrode sheet 222.
  • the relevant structure of the electrode assembly 22 manufactured by the manufacturing method provided by the above embodiments can refer to the electrode assembly 22 provided by the above embodiments, and will not be repeated here.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Secondary Cells (AREA)

Abstract

La présente invention se rapporte au domaine technique des batteries, et concerne un ensemble électrode et son procédé de fabrication, un élément de batterie, une batterie et un dispositif électrique. L'ensemble électrode comprend une feuille d'électrode négative et une feuille d'électrode positive. La feuille d'électrode positive comporte des premières sections courbées et une pluralité de premières sections droites, et toutes les deux premières sections droites adjacentes sont reliées au moyen de la première section courbée. La feuille d'électrode négative comporte des secondes sections courbées et une pluralité de secondes sections droites, et toutes les deux secondes sections droites adjacentes sont reliées au moyen de la seconde section courbée. Les premières sections droites et les secondes sections droites sont empilées en alternance dans une première direction, la première section courbée est située à une extrémité de la première section droite dans une deuxième direction, la seconde section courbée est située au niveau d'une extrémité de la seconde section droite dans une troisième direction, et la première direction, la deuxième direction et la troisième direction sont perpendiculaires l'une à l'autre. L'ensemble électrode peut soulager un phénomène de dislocation de la feuille d'électrode positive et de la feuille d'électrode négative dans un processus de production, ce qui permet d'améliorer la précision de fabrication de l'ensemble électrode, et d'améliorer la qualité de production de l'ensemble électrode et les performances d'utilisation de l'ensemble électrode.
PCT/CN2022/129616 2022-11-03 2022-11-03 Ensemble électrode et son procédé de fabrication, élément de batterie, batterie et dispositif électrique WO2024092638A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/CN2022/129616 WO2024092638A1 (fr) 2022-11-03 2022-11-03 Ensemble électrode et son procédé de fabrication, élément de batterie, batterie et dispositif électrique
CN202280093426.9A CN118843964A (zh) 2022-11-03 2022-11-03 电极组件及其制造方法、电池单体、电池及用电装置

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PCT/CN2022/129616 WO2024092638A1 (fr) 2022-11-03 2022-11-03 Ensemble électrode et son procédé de fabrication, élément de batterie, batterie et dispositif électrique

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Citations (6)

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Publication number Priority date Publication date Assignee Title
CN106159206A (zh) * 2015-04-13 2016-11-23 宁德新能源科技有限公司 锂离子电池极片制备方法
CN109786643A (zh) * 2019-02-01 2019-05-21 江苏烨晨智能科技有限公司 一种电池极片正负极结构
CN112670435A (zh) * 2020-12-17 2021-04-16 惠州市豪鹏科技有限公司 电池极片制备方法
CN113839002A (zh) * 2020-06-24 2021-12-24 华为技术有限公司 一种锂电池电极片的制作方法
CN215896628U (zh) * 2021-09-29 2022-02-22 宁德时代新能源科技股份有限公司 一种电池单体、电池及用电装置
CN115064781A (zh) * 2022-05-20 2022-09-16 楚能新能源股份有限公司 一种用于电芯的复合芯包、电芯和电池模组

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106159206A (zh) * 2015-04-13 2016-11-23 宁德新能源科技有限公司 锂离子电池极片制备方法
CN109786643A (zh) * 2019-02-01 2019-05-21 江苏烨晨智能科技有限公司 一种电池极片正负极结构
CN113839002A (zh) * 2020-06-24 2021-12-24 华为技术有限公司 一种锂电池电极片的制作方法
CN112670435A (zh) * 2020-12-17 2021-04-16 惠州市豪鹏科技有限公司 电池极片制备方法
CN215896628U (zh) * 2021-09-29 2022-02-22 宁德时代新能源科技股份有限公司 一种电池单体、电池及用电装置
CN115064781A (zh) * 2022-05-20 2022-09-16 楚能新能源股份有限公司 一种用于电芯的复合芯包、电芯和电池模组

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