WO2024140026A1 - 电极组件、电池和用电设备 - Google Patents
电极组件、电池和用电设备 Download PDFInfo
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- WO2024140026A1 WO2024140026A1 PCT/CN2023/135985 CN2023135985W WO2024140026A1 WO 2024140026 A1 WO2024140026 A1 WO 2024140026A1 CN 2023135985 W CN2023135985 W CN 2023135985W WO 2024140026 A1 WO2024140026 A1 WO 2024140026A1
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- WIPO (PCT)
- Prior art keywords
- insulating layer
- recess
- electrode assembly
- current collector
- active material
- Prior art date
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
- H01M10/0585—Construction or manufacture of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
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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
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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
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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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
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/4235—Safety or regulating additives or arrangements in electrodes, separators or electrolyte
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
- H01M50/521—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing characterised by the material
- H01M50/526—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing characterised by the material having a layered structure
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
- H01M50/533—Electrode connections inside a battery casing characterised by the shape of the leads or tabs
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/572—Means for preventing undesired use or discharge
- H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
- H01M50/586—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries inside the batteries, e.g. incorrect connections of electrodes
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/572—Means for preventing undesired use or discharge
- H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
- H01M50/59—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries characterised by the protection means
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/572—Means for preventing undesired use or discharge
- H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
- H01M50/59—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries characterised by the protection means
- H01M50/593—Spacers; Insulating plates
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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
- H01M2220/00—Batteries for particular applications
- H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
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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
- H01M2220/00—Batteries for particular applications
- H01M2220/30—Batteries in portable systems, e.g. mobile phone, laptop
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Definitions
- the present application relates to the field of energy storage technology, and in particular to an electrode assembly, a battery and an electrical device.
- An embodiment of the present application provides an electrode assembly, which includes a first pole piece, a separator and a second pole piece arranged in sequence.
- the electrode assembly also includes a pole ear, a first insulating layer and a second insulating layer.
- the first pole piece includes a first current collector and a first active material layer coated on both sides of the first current collector in a first direction, and the first direction is the thickness direction of the first current collector.
- the first active material layer is provided with a pole ear groove exposing the first current collector, and the pole ear connected to the first current collector is provided in the pole ear groove.
- At least one surface of the first active material layer is provided with a thinning area connected to the pole ear groove, and the thinning area includes a first recessed portion spaced apart from the pole ear groove in the first direction, and a second recessed portion provided between the first recessed portion and the pole ear groove.
- the second direction is defined as the width direction of the first current collector.
- the bottom wall of the second recessed portion is separated by the pole ear groove to form two first step surfaces spaced apart
- the bottom wall of the first recessed portion is separated by the second recessed portion to form two second step surfaces spaced apart.
- the first insulating layer is provided in the second recessed portion, and the two ends of the first insulating layer are respectively located on the two first step surfaces.
- the second insulating layer is connected to the side of the second pole piece facing the first recessed portion, and the projection of the second insulating layer in the first direction is located in the first recessed portion.
- the relationship between the depth T1 of the first recess, the depth T2 of the second recess, the thickness L1 of the first insulating layer and the thickness L2 of the second insulating layer satisfies: T1 ⁇ L2, T2 ⁇ L1, T1 ⁇ 5 ⁇ m, 5 ⁇ m ⁇ L2 ⁇ 20 ⁇ m.
- the embodiment of the present application also provides an electrode assembly, the electrode assembly includes a first pole piece, a separator, and a second pole piece arranged in sequence.
- the electrode assembly also includes a pole ear, a first insulating layer, and a second insulating layer.
- the first pole piece includes a first current collector and a first active material layer coated on both sides of the first current collector in a first direction, and the first direction is the thickness direction of the first current collector.
- the first active material layer is provided with a pole ear groove exposing the first current collector, and the pole ear groove A pole lug connected to the first current collector is provided in the middle.
- the first insulating layer is accommodated by the second recess, and the first recess accommodates at least part of the second insulating layer, thereby improving the flatness of the electrode assembly, thereby improving the energy density of the battery provided with the electrode assembly.
- the cathode impedance is increased by the third insulating layer to reduce the risk of lithium deposition due to the large thickness difference between the first active material layer at both ends of the second insulating layer and the active material layer on the corresponding second pole piece.
- the relationship between the depth T1 of the first recess, the depth T2 of the second recess, the thickness L1 of the first insulating layer, and the thickness L2 of the second insulating layer satisfies: T1 ⁇ L2,
- the third direction is defined as the length direction of the first current collector.
- the length D3 of the third insulating layer satisfies: 4mm ⁇ D3 ⁇ 8mm, so that the projection of the third insulating layer in the first direction extends from the first recessed portion to the flat coating area.
- the first active material layer includes a first surface and a second surface arranged opposite to each other in a first direction.
- the first active material layer is provided with a thinning area, and the thinning area is provided on one of the first surface and the second surface.
- the electrode assembly also includes a fourth insulating layer and a fifth insulating layer, the fourth insulating layer is connected to the other of the first surface and the second surface, the fourth insulating layer covers the end of the pole ear groove away from the thinning area, and the fifth insulating layer is connected to the side of the second pole piece facing the fourth insulating layer.
- the projection of the first insulating layer overlaps with the projection of the fourth insulating layer
- the projection of the second insulating layer overlaps with the projection of the fifth insulating layer.
- An embodiment of the present application also provides a battery, comprising the electrode assembly in any of the above embodiments.
- FIG. 3 is a second structural schematic diagram of an electrode assembly in one embodiment of the present application.
- FIG. 5 is a third structural schematic diagram of an electrode assembly in one embodiment of the present application.
- FIG. 6 is a schematic diagram of the structure of a battery and an electrical device in one embodiment of the present application.
- the electrode assembly 100 further includes a tab 40, a first insulating layer 51 and a second insulating layer 52.
- the first pole piece 10 includes a first current collector 11 and a first active material layer 12 coated on both sides of the first current collector 11 in a first direction Z, and the first direction Z is the thickness direction of the first current collector 11.
- the first active material layer 12 is provided with a tab groove 13 exposing the first current collector 11, and the tab groove 13 is provided with a tab 40 connected to the first current collector 11.
- the first active material layer 12 can allow lithium ions to be extracted and embedded.
- the first current collector 11 conducts the current generated by the electrochemical reaction to the external circuit through the tab 40, thereby realizing the process of converting chemical energy into electrical energy.
- the relationship between the depth T1 of the first recess 121, the depth T2 of the second recess 122, the thickness L1 of the first insulating layer 51, and the thickness L2 of the second insulating layer 52 satisfies: T1 ⁇ L2, T2 ⁇ L1, T1 ⁇ 5 ⁇ m, 5 ⁇ m ⁇ L2 ⁇ 20 ⁇ m.
- the second insulating layer 52 is at least partially embedded in the first recess 121 to eliminate the influence of at least part of the second insulating layer 52 on the flatness of the electrode assembly 100.
- first thinned area 12c and the second thinned area 12d may be selectively provided with a third insulating layer 53 according to the depth T1 of each first concave portion 121. Specifically, when the depth T1 of the first concave portion 121 of both the first thinned area 12c and the second thinned area 12d is ⁇ 5 ⁇ m, the first thinned area 12c and the second thinned area 12d are not provided with the third insulating layer 53.
- the first active material layer 12 has a thinned region 12a, and the thinned region 12a is disposed on one of the first surface 123 and the second surface 124.
- the electrode assembly 100 further includes a fourth insulating layer 54 and a fifth insulating layer 55.
- the fourth insulating layer 54 is connected to the other of the first surface 123 and the second surface 124.
- the fourth insulating layer 54 covers one end of the electrode tab groove 13 away from the thinned region 12a.
- the fifth insulating layer 55 is 55 is connected to the side of the second pole piece 30 facing the fourth insulating layer 54.
- the fourth insulating layer 54 and the fifth insulating layer 55 are used to separate the pole tab 40 and the second pole piece 30 on the side away from the thinned area 12a.
- the relationship among the depth T1 of the first recess 121, the depth T2 of the second recess 122, the thickness L1 of the first insulating layer 51, the thickness L2 of the second insulating layer 52, the thickness L4 of the fourth insulating layer 54, and the thickness L5 of the fifth insulating layer 55 satisfies: L1+L4 ⁇ T2, L2+L5 ⁇ T1.
- the second insulating layer 52 is completely embedded in the first recess 121
- the first insulating layer 51 is completely contained in the second recess 122
- the fourth insulating layer 54 and the fifth insulating layer 55 can protrude toward the thinning area 12a
- the first recess 121 can eliminate the influence of the second insulating layer 52 and the fifth insulating layer 55 on the flatness of the electrode assembly 100
- the second recess 122 can eliminate the influence of the first insulating layer 51 and the fourth insulating layer 54 on the flatness of the electrode assembly 100, thereby reducing the risk of lithium plating.
- the first current collector 11 in the tab groove 13 is provided with a third recess 111 sunken along the first direction Z, and the third recess 111 is used to reduce the influence of the tab 40 in the first direction Z on the thickness of the first pole sheet 10 .
- the embodiment of the present application further provides a battery 200 .
- the battery 200 includes the electrode assembly 100 in any of the above embodiments.
- An embodiment of the present application further provides an electric device 300.
- the electric device 300 includes the battery 200 in any of the above embodiments.
- the electric device 300 can be an electronic device such as a mobile phone or a tablet computer, or a mobile device such as a drone or an electric car.
- the first insulating layer 51 is accommodated by the second recess 122, and the first recess 121 accommodates at least part of the second insulating layer 52, thereby improving the flatness of the electrode assembly 100, and further improving the energy density of the battery provided with the electrode assembly 100.
- the thickness difference between the first active material layer 12 at both ends of the second insulating layer 52 and the corresponding active material layer on the second pole piece 30 is limited by the depth T1 ⁇ 5 ⁇ m of the first recess 121, thereby reducing the risk of lithium deposition.
- the cathode impedance is increased by the third insulating layer 53 to reduce the risk of lithium deposition due to the large thickness difference between the first active material layer 12 at both ends of the second insulating layer 52 and the corresponding active material layer on the second pole piece 30.
- Embodiment 1 of the present application provides an electrode assembly 100a.
- the thinned area 12a includes a first thinned area 12c and a second thinned area 12d.
- the first thinned area 12c is disposed on the first surface 123
- the second thinned area 12d is disposed on the second surface 124.
- the first thinned area 12c and the second thinned area 12d are respectively provided with a first recess 121 and a second recess 122.
- the projection of the first recess 121 in the first thinned area 12c overlaps with the projection of the first recess 121 in the second thinned area 12d
- the projection of the second recess 122 in the first thinned area 12c overlaps with the projection of the second recess 122 in the second thinned area 12d.
- the first thinned area 12c and the second thinned area 12d are respectively provided with a first insulating layer 51 and a second insulating layer 52.
- the depth T1 of the first concave portion 121 of the first thinned area 12c and the second thinned area 12d is ⁇ 5 ⁇ m.
- the length of the tab groove 13 is 9 mm, and the width of the tab 40 is 6 mm.
- the length D1 of the first insulating layer 51 is 11 mm
- the thickness L1 of the first insulating layer 51 is 16 ⁇ m
- the length W2 of the second recess 122 is 13 mm
- the depth T2 of the second recess 122 is 18 ⁇ m
- the length D2 of the second insulating layer 52 is 20 mm
- the thickness L2 of the second insulating layer 52 is 10 ⁇ m
- the length W1 of the first recess 121 is 26 mm
- the depth T1 of the first recess 121 is 5 ⁇ m.
- the second insulating layer 52 is embedded in the first recess 121 from outside the first recess 121 to eliminate the influence of part of the second insulating layer 52 on the flatness of the electrode assembly 100.
- the first insulating layer 51 is completely contained in the second recess 122 to eliminate the influence of the first insulating layer 51 on the flatness of the electrode assembly 100.
- the thickness difference between the first active material layer 12 located at both ends of the second insulating layer 52 and the corresponding active material layer on the second pole piece 30 is limited by T1 ⁇ 5 ⁇ m, thereby reducing the risk of lithium deposition.
- the projection of the first recess 121 in the first thinned area 12c overlaps with the projection of the first recess 121 in the second thinned area 12d
- the projection of the second recess 122 in the first thinned area 12c overlaps with the projection of the second recess 122 in the second thinned area 12d.
- the first thinned area 12c and the second thinned area 12d are provided with a first insulating layer 51 and a second insulating layer 52, respectively.
- the length of the tab groove 13 is 9 mm, and the width of the tab 40 is 6 mm.
- the length D1 of the first insulating layer 51 is 11 mm
- the thickness L1 of the first insulating layer 51 is 16 ⁇ m
- the length W2 of the second recess 122 is 13 mm
- the depth T2 of the second recess 122 is 18 ⁇ m
- the length D2 of the second insulating layer 52 is 20 mm
- the thickness L2 of the second insulating layer 52 is 10 ⁇ m
- the length W1 of the first recess 121 is 26 mm
- the depth T1 of the first recess 121 is 12 ⁇ m.
- the thickness L3 of the third insulating layer 53 satisfies: 2 ⁇ m ⁇ L3 ⁇ 5 ⁇ m, and the length D3 of the third insulating layer 53 satisfies: 4 mm ⁇ D3 ⁇ 8 mm.
- the second insulating layer 52 is completely embedded in the first recess 121 to eliminate the influence of the second insulating layer 52 on the flatness of the electrode assembly 100.
- the cathode impedance is increased by the third insulating layer 53 to reduce the risk of lithium deposition due to the large thickness difference between the first active material layer 12 at both ends of the second insulating layer 52 and the corresponding active material layer on the second electrode 30.
- the first embodiment of the present application provides an electrode assembly 100c, wherein the first active material layer 12 is provided with a thinning area 12a, and the thinning area 12a is provided on the first surface 123.
- the first thinning area 12c is provided with a first recess 121 and a second recess 122.
- the first thinning area 12c and the second thinning area 12d are provided with a first insulating layer 51 and a second insulating layer 52, respectively.
- the electrode assembly 100 further includes a fourth insulating layer 54 and a fifth insulating layer 55, wherein the fourth insulating layer 54 is connected to the second surface 124 and covers the end of the pole lug groove 13 away from the thinning area 12a, and the fifth insulating layer 55 is connected to the side of the second pole piece facing the fourth insulating layer 54.
- the length of the tab groove 13 is 9 mm, and the width of the tab 40 is 6 mm.
- the length D1 of the first insulating layer 51 is 11 mm
- the thickness L1 of the first insulating layer 51 is 16 ⁇ m
- the length W2 of the second recess 122 is 13 mm
- the depth T2 of the second recess 122 is 36 ⁇ m
- the length D2 of the second insulating layer 52 is 20 mm
- the thickness L2 of the second insulating layer 52 is 10 ⁇ m
- the length W1 of the first recess 121 is 26 mm
- the depth T1 of the first recess 121 is 24 ⁇ m.
- the length of the fourth insulating layer 54 is 11 mm
- the length of the fifth insulating layer 55 is 20 mm
- the thickness L4 of the fourth insulating layer 54 is 16 mm
- the thickness L5 of the fifth insulating layer 55 is 10 mm.
- the second insulating layer 52 in the first direction Z, is completely embedded in the first recess 121, the first insulating layer 51 is completely contained in the second recess 122, the fourth insulating layer 54 and the fifth insulating layer 55 can protrude toward the thinned area 12a, the first recess 121 can eliminate the influence of the second insulating layer 52 and the fifth insulating layer 55 on the flatness of the electrode assembly 100, and the second recess 122 can eliminate the influence of the first insulating layer 51 and the fourth insulating layer 54 on the flatness of the electrode assembly 100.
- the cathode impedance is increased by the third insulating layer 53 to reduce the risk of lithium deposition due to the large thickness difference between the first active material layer 12 at both ends of the second insulating layer 52 and the corresponding active material layer on the second pole piece 30.
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Battery Electrode And Active Subsutance (AREA)
- Secondary Cells (AREA)
- Connection Of Batteries Or Terminals (AREA)
Abstract
Description
电极组件 100、100a、100b、100c
电池 200
用电设备 300
第一极片 10
第一集流体 11
第三凹部 111
第一活性材料层 12
削薄区 12a
第一凹部 121
第二阶面 121a
第二凹部 122
第一阶面 122a
第一表面 123
第二表面 124
平涂区 12b
第一削薄区 12c
第二削薄区 12d
极耳槽 13
隔离膜 20
第一部分 21
第二极片 30
第二集流体 31
第二活性材料层 32
极耳 40
第一绝缘层 51
第二绝缘层 52
第三绝缘层 53
第四绝缘层 54
第五绝缘层 55
第一方向 Z
第二方向 X
第三方向 Y
Claims (14)
- 一种电极组件,所述电极组件包括依序设置的第一极片、隔离膜和第二极片,所述电极组件还包括极耳、第一绝缘层和第二绝缘层,所述第一极片包括第一集流体和在第一方向上涂覆于所述第一集流体两侧的第一活性材料层,所述第一方向为所述第一集流体的厚度方向,所述第一活性材料层上设有暴露所述第一集流体的极耳槽,所述极耳槽中设有与所述第一集流体连接的极耳,其特征在于,所述第一活性材料层的至少一个表面设有连通所述极耳槽的削薄区,所述削薄区包括在所述第一方向上与所述极耳槽间隔设置的第一凹部,以及设置于所述第一凹部和所述极耳槽之间的第二凹部,定义第二方向为所述第一集流体的宽度方向,沿所述第二方向观察,所述第二凹部的底壁被所述极耳槽分隔形成两个间隔设置的第一阶面,所述第一凹部的底壁被所述第二凹部分隔形成两个间隔设置的第二阶面;所述第一绝缘层设置于所述第二凹部中,且所述第一绝缘层两端分别位于两个所述第一阶面上;所述第二绝缘层连接于所述第二极片朝向所述第一凹部的一侧,所述第二绝缘层在所述第一方向上的投影位于所述第一凹部中;沿所述第一方向,所述第一凹部的深度T1、所述第二凹部的深度T2、所述第一绝缘层的厚度L1以及所述第二绝缘层的厚度L2之间的关系满足:T1≤L2,T2≥L1,T1≤5μm,5μm≤L2≤20μm。
- 如权利要求1所述的电极组件,其特征在于,1μm≤T1≤3μm。
- 一种电极组件,所述电极组件包括依序设置的第一极片、隔离膜和第二极片,所述电极组件还包括极耳、第一绝缘层和第二绝缘层,所述第一极片包括第一集流体和在第一方向上涂覆于所述第一集流体两侧的第一活性材料层,所述第一方向为所述第一集流体的厚度方向,所述第一活性材料层上设有暴露所述第一集流体的极耳槽,所述极耳槽中设有与所述第一集流体连接的极耳,其特征在于,所述第一活性材料层的至少一个表面设有连通所述极耳槽的削薄区,所述削薄区包括在所述第一方向上与所述极耳槽间隔设置的第一凹部,以及设置于所述第一凹部和所述极耳槽之间的第二凹部,定义第二方向为所述第一集流体的宽度方向,沿所述第二方向观察,所述第二凹部的底壁被所述极耳槽分隔形成两个间隔设置的第一阶面,所述第一凹部的底壁被所述第二凹部分隔形成两个间隔设置的第二阶面;所述第一绝缘层设置于所述第二凹部中,且所述第一绝缘层两端分别位于两个所述第一阶面上;所述第二绝缘层连接于所述第二极片朝向所述第一凹部的一侧,沿所述第一方向,所述第二绝缘层在所述第一方向上的投影位于所述第一凹部中;沿所述第二方向观察,所述第一活性材料层还设有位于所述削薄区两侧的平涂区,所述电极组件还包括连接于所述第二绝缘层两端的两个第三绝缘层,每一 个所述第三绝缘层在所述第一方向上的投影自所述第一凹部延伸至所述平涂区。
- 如权利要求3所述的电极组件,其特征在于,沿所述第一方向,所述第一凹部的深度T1、所述第二凹部的深度T2、所述第一绝缘层的厚度L1以及所述第二绝缘层的厚度L2之间的关系满足:T1≥L2,T2≥L1,T1>5μm。
- 如权利要求3所述的电极组件,其特征在于,所述第三绝缘层由聚乙烯醇或聚丙烯酸或两者的混合物涂覆于所述第二极片上形成。
- 如权利要求3所述的电极组件,其特征在于,沿所述第一方向,所述第三绝缘层的厚度L3满足:2μm≤L3≤5μm。
- 如权利要求3所述的电极组件,其特征在于,定义第三方向为所述第一集流体的长度方向,沿所述第三方向,所述第三绝缘层的长度D3满足:4mm≤D3≤8mm。
- 如权利要求1或3所述的电极组件,其特征在于,定义第三方向为所述第一集流体的长度方向,沿所述第三方向,所述第一凹部的长度W1、所述第二凹部的长度W2、所述第一绝缘层的长度D1以及所述第二绝缘层的长度D2之间的关系满足:W1≥D2,W2≥D1,W1>W2,D2>D1。
- 如权利要求1或3所述的电极组件,其特征在于,所述第一活性材料层包括在所述第一方向上相对设置的第一表面和第二表面,所述削薄区包括第一削薄区和第二削薄区,所述第一削薄区设于所述第一表面,所述第二削薄区设于所述第二表面,沿所述第一方向,所述第一削薄区中第一凹部的投影和所述第二削薄区中第一凹部的投影重叠,所述第一削薄区中第二凹部的投影和所述第二削薄区中第二凹部的投影重叠。
- 如权利要求1或3所述的电极组件,其特征在于,位于所述极耳槽中的第一集流体设有沿第一方向凹陷的第三凹部,所述极耳容纳于所述第三凹部中。
- 如权利要求1或3所述的电极组件,其特征在于,所述第一活性材料层包括在所述第一方向上相对设置的第一表面和第二表面,所述第一活性材料层设有一个所述削薄区,所述削薄区设于所述第一表面和所述第二表面中的其中一者,所述电极组件还包括第四绝缘层和第五绝缘层,所述第四绝缘层连接于所述第一表面和所述第二表面中的另外一者,所述第四绝缘层覆盖所述极耳槽背离所述削薄区的一端,所述第五绝缘层连接于所述第二极片朝向所述第四绝缘层的一侧,沿所述第一方向,所述第一绝缘层的投影和所述第四绝缘层的投影重叠,所述第二绝缘层的投影和所述第五绝缘层的投影重叠。
- 如权利要求11所述的电极组件,其特征在于,沿所述第一方向,所述第一凹部的深度T1、所述第二凹部的深度T2、所述第一绝缘层的厚度L1、所述第二绝缘层的厚度L2、所述第四绝缘层的厚度L4,所述第五绝缘层的厚度L5之间的关系满足:L1+L4≤T2,L2+L5≤T1。
- 一种电池,其特征在于,所述电池包括如权利要求1至12中任意一项所 述的电极组件。
- 一种用电设备,其特征在于,所述用电设备还包括如权利要求13所述的电池。
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