WO2023279298A1 - Appareil électrochimique et appareil électronique le comprenant - Google Patents

Appareil électrochimique et appareil électronique le comprenant Download PDF

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Publication number
WO2023279298A1
WO2023279298A1 PCT/CN2021/105036 CN2021105036W WO2023279298A1 WO 2023279298 A1 WO2023279298 A1 WO 2023279298A1 CN 2021105036 W CN2021105036 W CN 2021105036W WO 2023279298 A1 WO2023279298 A1 WO 2023279298A1
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WO
WIPO (PCT)
Prior art keywords
current collector
layer
pole piece
insulating layer
groove
Prior art date
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PCT/CN2021/105036
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English (en)
Chinese (zh)
Inventor
刘祖超
Original Assignee
宁德新能源科技有限公司
东莞新能源科技有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
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Application filed by 宁德新能源科技有限公司, 东莞新能源科技有限公司 filed Critical 宁德新能源科技有限公司
Priority to CN202180005883.3A priority Critical patent/CN114586217A/zh
Priority to PCT/CN2021/105036 priority patent/WO2023279298A1/fr
Publication of WO2023279298A1 publication Critical patent/WO2023279298A1/fr

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H01M10/0585—Construction or manufacture of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/64—Carriers or collectors
    • H01M4/66—Selection of materials
    • H01M4/665—Composites
    • H01M4/667—Composites in the form of layers, e.g. coatings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/536—Electrode connections inside a battery casing characterised by the method of fixing the leads to the electrodes, e.g. by welding
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/572—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
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Definitions

  • the present application relates to the technical field of batteries, in particular to an electrochemical device and an electronic device including the electrochemical device.
  • Electrochemical devices such as lithium-ion batteries have been widely used in mobile communication devices, wearable devices, drones, energy storage devices, and power devices.
  • the application scenarios are becoming more and more complex, and the interaction with people is becoming more and more frequent.
  • the energy density, charge and discharge performance, safety performance, production efficiency and cost requirements of electrochemical devices are getting higher and higher.
  • the present application provides an electrochemical device and an electronic device including the electrochemical device, the electrochemical device has improved charge and discharge performance and safety performance.
  • An embodiment of the present application provides an electrochemical device.
  • the electrochemical device includes an electrode assembly, and the electrode assembly includes a first pole piece, an isolation film and a second pole piece, and the isolation film is arranged between the first pole piece and the second pole piece.
  • the first pole piece includes a first current collector and a first layer disposed on the first surface of the first current collector, and the first layer is provided with a first groove.
  • the second pole piece includes a second current collector and a second layer disposed on the first surface of the second current collector, and the second layer is disposed opposite to the first layer.
  • the electrochemical device further includes a first tab disposed in the first groove and electrically connected to the first current collector.
  • the second layer includes a first insulating layer disposed opposite to the first groove; in the thickness direction of the electrode assembly, the projection of the first insulating layer at least partially overlaps the projection of the first groove.
  • the first tab is arranged in the first groove opened on the first layer, which improves the high rate charge and discharge capability of the electrochemical device.
  • the first insulating layer is arranged at the corresponding position of the second layer, the first insulating layer can increase the resistance of the second pole piece, reduce the current when the first pole piece and the second pole piece are short-circuited, and improve the safety performance.
  • the first groove exposes the first current collector.
  • the exposed first current collector is more conducive to the heat dissipation of the electrochemical device in the state of high-rate charge and discharge; further, at the first current collector exposed by the first groove, the first tab is connected to the first current collector, The reliability of the electrical connection of the first tab is improved.
  • the first insulating layer is in contact with the isolation film.
  • the first tab is in contact with the isolation film. At least one of the first insulating layer or the first tab is in contact with the separator, so that an additional insulating member can be omitted on the surface corresponding to the first groove and/or the second layer during the manufacturing process of the electrode assembly. operation. Therefore, on the one hand, the manufacturing process of the electrode assembly can be simplified and the manufacturing efficiency can be improved; The material cost of the piece.
  • the first pole piece is a negative pole piece
  • the second pole piece is a positive pole piece
  • the projection of the first groove is set within the projection of the first insulating layer. That is, the positive pole piece corresponding to the first groove is replaced by the first insulating layer, and in the thickness direction of the electrode assembly, the projected area of the first insulating layer is greater than or equal to the projected area of the first groove, which can reduce the There is a risk of lithium precipitation in the tank, which improves safety performance.
  • the first pole piece is a positive pole piece
  • the second pole piece is a negative pole piece.
  • the projection of the first tab is set within the projection of the first layer, and the first insulation The projection of the layer is located within the projection of the first recess. That is, in the thickness direction of the electrode assembly, the first layer can cover the first tab, and the first groove covers the first insulating layer. On the one hand, it can reduce the risk of contact short circuit between the first tab and the second pole piece. , can reduce the risk of lithium precipitation in the second layer.
  • the first tab and the first current collector are connected by soldering, which can have high connection reliability.
  • the first tab and the first current collector are connected by conductive glue, which can reduce the probability of burrs on the first tab, thereby reducing the risk of contact short circuit between the first tab and the second pole piece, and improving safety. performance.
  • the first pole piece further includes a third layer disposed on the second surface of the first current collector, and the first surface of the first current collector and the second surface of the first current collector are disposed on the first current collector.
  • the third layer is provided with a second groove;
  • the second pole piece also includes a fourth layer arranged on the second surface of the second current collector, the first surface of the second current collector and the second surface of the second current collector.
  • the second surface is arranged on opposite sides of the second current collector, and the fourth layer is arranged facing the third layer; wherein, the fourth layer includes a second insulating layer arranged opposite to the second groove, and in the electrode assembly In the thickness direction of the first tab, the projection of the first tab is set within the projection of the second groove, and the projection of the second insulating layer and the projection of the second groove at least partially overlap. That is, the second groove is provided on the side of the first current collector away from the first tab, and the second insulating layer is provided at the position corresponding to the second pole piece and the second groove, which is beneficial to the contact between the first tab and the first collector. Fluid connection, or can also reduce the risk of lithium precipitation at the second groove, and improve safety.
  • the second groove exposes the first current collector to further improve the heat dissipation performance of the electrochemical device.
  • the second insulating layer is in contact with the isolation film.
  • the second groove exposes the first current collector, and the first current collector exposed by the second groove is in contact with the isolation film. At least one of the second insulating layer or the first current collector exposed in the second groove is in contact with the separator, on the one hand, the manufacturing process of the electrode assembly can be simplified and the manufacturing efficiency can be improved; on the other hand, the electrode assembly can also be reduced.
  • the overall thickness of the component improves the energy density of the electrochemical device, and to a certain extent reduces the material cost of installing the insulating part in the electrode component manufacturing stage.
  • the first pole piece further includes a third layer disposed on the second surface of the first current collector, and the first surface of the first current collector and the second surface of the first current collector are disposed on the first current collector.
  • the second pole piece also includes a fourth layer arranged on the second surface of the second current collector, and the first surface of the second current collector and the second surface of the second current collector are arranged opposite to the second current collector
  • the fourth layer is provided with a third groove
  • the electrochemical device also includes a second tab, the second tab is located in the third groove and is electrically connected to the second current collector; wherein, the third layer includes and The third groove faces the disposed third insulating layer, and in the thickness direction of the electrode assembly, the projection of the third insulating layer at least partially overlaps with the projection of the third groove.
  • the second tab is located in the third groove opened on the fourth layer, which improves the high rate charge and discharge capability of the electrochemical device.
  • a third insulating layer is provided at the corresponding place of the fourth layer, the third insulating layer can increase the resistance of the first pole piece, reduce the current when the first pole piece and the second pole piece are short-circuited, and improve the safety performance.
  • the third insulating layer is in contact with the isolation film.
  • the second tab is in contact with the isolation film. At least one of the third insulating layer or the second tab is in contact with the separator, on the one hand, the manufacturing process of the electrode assembly can be simplified, and the manufacturing efficiency can be improved; on the other hand, the overall thickness of the electrode assembly can be reduced to improve the electrochemical The energy density of the device is improved, and, to a certain extent, the cost of materials for setting insulating parts in the electrode assembly manufacturing stage is reduced.
  • the first insulating layer is disposed on the first surface of the second current collector, and the second layer further includes a second active material layer disposed on the first surface of the second current collector.
  • the first insulating layer can be in contact with the first surface of the second current collector, which is beneficial to improving manufacturing efficiency and further improving safety performance.
  • the first insulating layer is in contact with the second active material layer, which can increase the amount of the second active material layer and increase the energy density.
  • the thickness of the first insulating layer is less than or equal to the thickness of the second active material layer. In one embodiment, the thickness difference between the first insulating layer and the second active material layer is 0 ⁇ m to 50 ⁇ m. Controlling the thickness of the first insulating layer can improve the flatness of the electrode assembly, while balancing the safety performance of the electrochemical device and the material cost of the first insulating layer.
  • the thickness of the first insulating layer is 5 ⁇ m to 150 ⁇ m. Controlling the thickness of the first insulating layer within this range can make the second pole piece have greater resistance and thus better safety, and at the same time, the electrode assembly has better flatness.
  • the first insulating layer includes an inorganic material and a binder.
  • the inorganic material includes aluminum oxide, silicon dioxide, magnesium oxide, titanium oxide, hafnium oxide, tin oxide, cerium oxide, nickel oxide, zinc oxide, calcium oxide, zirconium dioxide, yttrium oxide, carbide At least one of silicon, boehmite, aluminum hydroxide, magnesium hydroxide, calcium hydroxide or barium sulfate.
  • the binder includes a homopolymer of vinylidene fluoride, a copolymer of vinylidene fluoride, a copolymer of hexafluoropropylene, polystyrene, polyphenylene vinylene, sodium polyvinate, potassium polyvinate, At least one of polyacrylate, polyacrylic acid, polyacrylonitrile, polyvinylpyrrolidone, polyvinyl ether, polymethylmethacrylate, polyethylene, polypropylene or polytetrafluoroethylene.
  • the first pole piece, the separator and the second pole piece are stacked and wound, and along the winding direction, a fourth insulating layer is provided on the first surface of the second current collector at the tail.
  • a fourth insulating layer is provided on the first surface of the second current collector at the tail.
  • the second pole piece further includes a fourth layer disposed on the second surface of the second current collector, and the first surface of the second current collector and the second surface of the second current collector are disposed on the second surface of the second current collector.
  • the second surface of the second current collector located at the tail is provided with a fifth insulating layer. In this way, insulating layers are provided on both sides of the tail of the second current collector, further improving the safety performance of the electrochemical device.
  • the fourth insulating layer has a thickness of 3 ⁇ m to 15 ⁇ m. In this way, while improving the safety performance of the electrochemical device, the impact on the energy density of the electrochemical device can be reduced.
  • the second layer is in contact with the fourth insulating layer.
  • the exposed area of the second current collector can be reduced, and the risk of short circuit between the second current collector and the first pole piece can be reduced.
  • the second pole piece further includes adhesive paper, and the adhesive paper is arranged at the junction of the second layer and the fourth insulating layer.
  • the stability of the joint between the second layer and the fourth insulating layer can be improved, the risk of peeling off of the second layer or the fourth insulating layer can be reduced, and the safety performance can be improved.
  • the present application also provides an electronic device, which includes the above electrochemical device.
  • FIG. 1 is a schematic structural diagram of an electrochemical device provided by an embodiment of the present application.
  • FIG. 2 is a schematic structural diagram of an electrode assembly provided by an embodiment of the present application.
  • Fig. 3 is a schematic structural diagram of an electrode assembly provided in another embodiment of the present application.
  • Fig. 4 is a schematic structural diagram of a first pole piece provided by an embodiment of the present application.
  • Fig. 5 is a schematic structural diagram of a first pole piece provided by another embodiment of the present application.
  • FIG. 6 is a schematic structural diagram of a second pole piece provided by an embodiment of the present application.
  • FIG. 7 is a schematic structural diagram of a second pole piece provided in another embodiment of the present application.
  • FIG. 8 is a schematic structural diagram of an electrode assembly provided in another embodiment of the present application.
  • FIG. 9 is a schematic structural view of an electrode assembly provided in another embodiment of the present application.
  • FIG. 10 is a partially enlarged schematic diagram of point A in FIG. 8 .
  • FIG. 11 is a partially enlarged schematic diagram of the location B in FIG. 9 .
  • FIG. 12 is a partially enlarged schematic view of a first insulating layer and an isolation film in an embodiment of the present application.
  • FIG. 13 is a partially enlarged schematic view of a first tab and an isolation film in an embodiment of the present application.
  • Fig. 14 is a structural schematic diagram of another viewing angle of the first pole piece provided by an embodiment of the present application.
  • FIG. 15 is a partially enlarged schematic view of a second insulating layer and an isolation film in an embodiment of the present application.
  • FIG. 16 is a partially enlarged schematic view of the second groove and the isolation film in an embodiment of the present application.
  • FIG. 17 is a partially enlarged schematic diagram of a third insulating layer and an isolation film in an embodiment of the present application.
  • FIG. 18 is a partially enlarged schematic view of a second tab and an isolation film in an embodiment of the present application.
  • FIG. 19 is a schematic structural diagram of a second pole piece provided in another embodiment of the present application.
  • Fig. 20 is a schematic structural diagram of a second pole piece provided in another embodiment of the present application.
  • Fig. 21a is a schematic projection of the first groove and the first insulating layer along the thickness direction on the first pole piece in an embodiment of the present application.
  • Fig. 21b is a schematic projection of the first groove and the first insulating layer on the first pole piece along the thickness direction in another embodiment of the present application.
  • Fig. 22 is a schematic projection of the first tab, the first groove and the first insulating layer on the first pole piece along the thickness direction in an embodiment of the present application.
  • the first pole piece 101 is the first pole piece 101
  • the third layer 1014 is the third layer 1014
  • the first active material layer 1019 is the first active material layer 1019
  • the first surface of the second fluid collector 1055 is the first surface of the second fluid collector 1055
  • connection and “fixation” should be understood in a broad sense.
  • “fixation” can be a fixed connection, a detachable connection, or an integral body;
  • a mechanical connection can also be an electrical connection; it can be a direct connection or an indirect connection through an intermediary, and it can be an internal communication between two elements or an interaction relationship between two elements, unless otherwise clearly defined.
  • the present application provides an electrochemical device 100 , which includes an electrode assembly 10 and a housing (not shown) for accommodating the electrode assembly 10 .
  • the direction X shown in the figure is the thickness direction of the electrode assembly 10
  • the first direction Y may be the length direction of the pole piece in the electrode assembly 10 or the width direction of the pole piece.
  • the second direction Z is the width direction of the pole piece in the electrode assembly 10 . vice versa.
  • the electrochemical device 100 may be a battery, for example, a secondary battery (such as a lithium ion secondary battery, etc.), but is not limited thereto.
  • the electrochemical device 100 may include an electrode assembly 10 and an electrolyte.
  • FIG. 2 is a schematic cross-sectional view along I-I of FIG. 1 .
  • the electrode assembly 10 includes a first pole piece 101 , a separator 103 and a second pole piece 105 , and the separator 103 is arranged between the first pole piece 101 and the second pole piece 105 .
  • the first pole piece 101, the separator 103 and the second pole piece 105 are laminated to form a stack, and then the stack is wound around the winding central axis O-O (refer to FIG. 1) and wound multiple times along the winding direction V to form the electrode assembly. 10.
  • the winding center axis O-O is arranged along the second direction Z. It should be understood that the electrode assembly 10 can also be stacked into a lamination structure by the first pole piece 101 , the separator 103 and the second pole piece 105 , as shown in FIG. 3 .
  • the first pole piece 101 includes a first current collector 1011 and a first layer 1012 disposed on a first surface of the first current collector.
  • the first layer 1012 is provided with a first groove 1013 .
  • the second pole piece 105 includes a second current collector 1051 and a second layer 1052 disposed on the first surface of the second current collector.
  • the second layer 1052 is disposed opposite to the first layer 1012 .
  • the arrangement of the second layer 1052 facing the first layer 1012 means that if there is no separator 103 , along the thickness direction X of the electrode assembly, the second layer 1052 and the first layer 1012 can be in contact.
  • the electrochemical device 100 further includes a first tab 30 disposed in the first groove 1013 and electrically connected to the first current collector 1011 .
  • the first tab 30 is connected to the first current collector 1011 by soldering and/or by conductive glue. It can be understood that the first tab 30 may be completely located in the first groove 1013, or the first tab 30 may be partially located in the first groove 1013 because the thickness of the first tab 30 is greater than that of the first layer 1012. .
  • the second layer 1052 includes the first insulating layer 11 disposed opposite to the first groove 1013 .
  • the arrangement of the first insulating layer 11 facing the first groove 1013 means that if there is no isolation film 103 , along the thickness direction X of the electrode assembly 10 , the first insulating layer 11 and the first groove 1013 can be in contact. In the thickness direction X of the electrode assembly 10 , the projection of the first insulating layer 11 and the projection of the first groove 1013 at least partially overlap.
  • the first tab 30 is disposed in the first groove 1013 of the first layer 1012, which improves the high rate charge and discharge capability of the electrochemical device.
  • the first insulating layer 11 is provided at the corresponding position of the second layer 1052, the first insulating layer 11 can increase the resistance of the second pole piece 105, reduce the current when the first pole piece 101 and the second pole piece 105 are short-circuited, and improve safety. performance.
  • the first pole piece 101 and the second pole piece 105 will be further described below.
  • the first pole piece 101 includes a first current collector 1011, and along the thickness direction X, the first current collector 1011 includes a first surface 1017 of the first current collector and a second surface 1018 of the first current collector that are oppositely arranged. .
  • the first pole piece 101 also includes a first layer 1012 disposed on the first surface 1017 of the first current collector and a third layer 1014 disposed on the second surface 1018 of the first current collector, the first layer 1012 is provided with a first recess Groove 1013. Further, the third layer 1014 may also be provided with a second groove 1015, as shown in FIG. 5 .
  • the second pole piece 105 includes a second current collector 1051.
  • the second current collector 1051 includes a first surface 1055 of the second current collector and a second surface 1056 of the second current collector that are oppositely arranged.
  • the second pole piece 105 further includes a second layer 1052 disposed on the first surface 1055 of the second current collector and a fourth layer 1053 disposed on the second surface 1056 of the second current collector.
  • the fourth layer 1053 further includes a second insulating layer 12 disposed opposite to the second groove 1015 .
  • tapes 60 may be provided at the tails of the second layer 1052 and the fourth layer 1053 to further improve the safety performance. It can be understood that the adhesive paper 60 can also be omitted.
  • the structure shown in FIG. 2 can be obtained by winding the first pole piece 101 in FIG. 4 , the second pole piece 105 in FIG. 6 and the separator 103 around the winding central axis O-O.
  • the structure shown in FIG. 8 can be obtained by winding the first pole piece 101 in FIG. 5 , the second pole piece 105 in FIG. 7 and the separator 103 around the winding central axis O-O.
  • the projection of the first tab 30 is located within the projection of the second groove 1015 , and the projection of the second insulating layer 12 and the projection of the second groove 1015 at least partially overlap.
  • a second groove 1015 is provided on the side of the first current collector 1011 away from the first tab 30, and a second insulating layer 12 is provided on the second pole piece 105 corresponding to the second groove 1015, which is beneficial to the first pole
  • the ear 30 is connected with the first current collector 1011 to increase the resistance of the second pole piece 105 .
  • the fourth layer 1053 of the second pole piece 105 is provided with the third groove 1054, and the electrochemical device 100 also includes the second tab 50, the second tab 50 is arranged on the third The groove 1054 is electrically connected to the second current collector 1051 .
  • the third layer 1014 includes a third insulating layer 13 disposed facing the third groove 1054 , and in the thickness direction X of the electrode assembly, the projection of the third insulating layer 13 is aligned with the third groove 1054 The projections of are at least partially overlapping.
  • the second tab 50 is disposed in the third groove 1054 of the fourth layer 1053 , which improves the high rate charge and discharge capability of the electrochemical device 100 .
  • the third insulating layer 13 is provided at the corresponding position of the fourth layer 1053, the third insulating layer 13 can increase the resistance of the first pole piece 101, reduce the current when the first pole piece 101 and the second pole piece 105 are short-circuited, and improve safety. performance.
  • FIG. 10 is an enlarged view of A in FIG. 8
  • FIG. 11 is an enlarged view of B in FIG. 9 .
  • the first layer 1012 is provided with a first groove 1013
  • the first tab 30 is arranged in the first groove 1013
  • the surface of the first tab 30 generally needs to be pasted with adhesive paper 60 (as shown in FIG. 10 ) to prevent the second A tab 30 pierces the isolation film 103 to cause a short circuit between the first pole piece 101 and the second pole piece 105 .
  • adhesive paper 60 as shown in FIG. 10
  • the manufacturing process of the electrode assembly 10 can be simplified to improve manufacturing efficiency; on the other hand, the overall thickness of the electrode assembly 10 can be reduced to increase the energy density of the electrochemical device.
  • the first insulating layer 11 may be in contact with the isolation film 103 , as shown in FIG. 12 ; the first tab 30 may also be in contact with the isolation film 103 , as shown in FIG. 13 . At least one of the first insulating layer 11 or the first tab 30 is in contact with the isolation film 103, and the position corresponding to the first groove 1013 and/or the second layer 1052 can be omitted during the manufacturing process of the electrode assembly 10.
  • Insulators for example, including but not limited to adhesive tape, etc.
  • the manufacturing process of the electrode assembly can be simplified, and the manufacturing efficiency can be improved; Sets the material cost for the insulation.
  • the first groove 1013 exposes the first current collector 1011 .
  • the exposed first current collector 1011 is more conducive to the heat dissipation of the electrochemical device 100 in the state of high-rate charge and discharge; and, at the first current collector 1011 exposed in the first groove 1013, the first tab 30 and the first The current collector 1011 is connected to improve the reliability of the electrical connection of the first tab 30 .
  • the second groove 1015 exposes the first current collector 1011 .
  • the second insulating layer 12 is in contact with the isolation film 103 .
  • the first current collector 1011 exposed by the second groove 1015 is in contact with the isolation film 103 .
  • At least one of the first current collectors 1011 exposed in the second insulating layer 12 or the second groove 1015 is in contact with the isolation film 103, on the one hand, the manufacturing process of the electrode assembly 10 can be simplified and the manufacturing efficiency can be improved; on the other hand On the one hand, the overall thickness of the electrode assembly 10 can be reduced, the energy density of the electrochemical device 100 can be improved, and, to a certain extent, the material cost of installing insulating parts during the manufacturing stage of the electrode assembly 10 can be reduced.
  • the third insulating layer 13 is in contact with the isolation film 103 .
  • the second tab 50 is in contact with the isolation film 103 .
  • At least one of the third insulating layer 13 or the second tab 50 is in contact with the isolation film 103, on the one hand, the manufacturing process of the electrode assembly 10 can be simplified, and the manufacturing efficiency can be improved; on the other hand, the overall size of the electrode assembly 10 can also be reduced.
  • the thickness improves the energy density of the electrochemical device, and to a certain extent reduces the material cost of installing the insulating part in the electrode assembly manufacturing stage.
  • the first surface 1055 of the second current collector at the tail is provided with a fourth insulating layer 14, and the second layer 1052 is in contact with the fourth insulating layer 14, which can reduce the number of second current collectors.
  • the exposed area of 1051 reduces the risk of short circuit between the second current collector 1051 and the first pole piece 101 .
  • the second surface 1056 of the second current collector at the tail is provided with the fifth insulating layer 15 .
  • the fourth insulating layer 14 and the fifth insulating layer 15 have a good insulating effect, when the isolation film 103 is damaged, the risk of the second current collector 1051 directly contacting the first pole piece 101 and causing a short circuit can be reduced, and the electrochemical device can be improved. safety performance. At the same time, in the acupuncture test, the resistance of the second pole piece 105 can be further increased, thereby improving the pass rate of the electrochemical device 100 .
  • the second pole piece 105 further includes an adhesive paper 60 , and the adhesive paper 60 is disposed at the junction of the second layer 1052 and the fourth insulating layer 14 .
  • the adhesive tape 60 can also be disposed at the connection between the fourth layer 1053 and the fifth insulating layer 15 . In this way, the stability of the joint between the fourth layer 1053 and the fifth insulating layer 15 can be improved, the risk of peeling off of the fourth layer 1053 or the fifth insulating layer 15 can be reduced, and the safety performance can be improved.
  • the first pole piece 101 is a negative pole piece
  • the second pole piece 105 is a positive pole piece.
  • the projection of the first groove 1013 is set within the projection of the first insulating layer 11 . That is, the positive pole piece corresponding to the first groove 1013 is replaced by the first insulating layer 11, and in the thickness direction X of the electrode assembly 10, the projected area of the first insulating layer 11 is larger than the projected area of the first groove 1013, as shown in the figure 21a; the projected area of the first insulating layer 11 may also be equal to the projected area of the first groove 1013, as shown in FIG. 21b. In this way, the risk of lithium precipitation in the first groove 1013 can be reduced and the safety performance can be improved.
  • the first pole piece 101 is a positive pole piece
  • the second pole piece 105 is a negative pole piece.
  • the projection of the first tab 30 is set to the projection of the first layer 1012 Inside, the projection of the first insulating layer 11 is set within the projection of the first groove 1013 .
  • the positive pole piece When the positive pole piece is provided with an embedded first tab 30, the positive pole piece is provided with a first groove 1013, and the first tab 30 is set in the first groove 1013, then the corresponding negative pole piece needs to be provided with a first Insulating layer 11, but the first insulating layer 11 cannot exceed the range of the first groove 1013, because the positive electrode sheet can delithiate, and the negative electrode sheet can insert lithium, if the range of the first insulating layer 11 on the negative electrode sheet exceeds the first groove In the range of 1013, some lithium ions released from the positive electrode active layer on the edge of the first groove 1013 are not received by the corresponding negative electrode sheet, resulting in lithium precipitation.
  • the projection of the first tab 30 and the projection of the first groove 1013 may completely overlap.
  • the first insulating layer 11 can cover the first tab 30, and the first groove 1013 covers the first insulating layer 11.
  • the first tab 30 and the first tab 30 can be lowered.
  • the risk of contact short circuit of the second pole piece 105 can reduce the risk of lithium precipitation in the second layer 1052 .
  • the second layer 1052 of the second pole piece 105 further includes a second active material layer 1016 disposed on the first surface 1055 of the second current collector.
  • the fourth layer 1053 may also include the second active material layer 1016 disposed on the second surface 1056 of the second current collector.
  • the first layer 1012 of the first pole piece 101 comprises the first active material layer 1019 disposed on the first surface 1017 of the first current collector
  • the third layer 1014 also comprises the second surface disposed on the first current collector. 1018 of the first active material layer 1019 .
  • the first layer 1012, the third layer 1014, the second layer 1052, and the fourth layer 1053 may also include a primer layer.
  • the primer layer may include a binder to increase its adhesion to the current collector.
  • the primer layer may include a conductive agent to improve the conductivity between it and the current collector.
  • the first active material layer 1019 may be provided on both sides of the winding starting end of the first pole piece 101 . In some embodiments, along the winding direction V, the first active material layer 1019 may be provided on one side of the winding starting end of the first pole piece 101 . Along the winding direction V, the winding starting end of the first pole piece 101 may be the first current collector 1011 without the first active material layer 1019 on both sides. In some embodiments, along the winding direction V, the winding ending end of the first pole piece 101 may be provided with the first active material layer 1019 on both sides.
  • the winding starting end of the second pole piece 105 can be provided with the second active material layer 1016 on both sides. In some embodiments, along the winding direction V, the winding end of the second pole piece 105 can be provided with the second active material layer 1016 on both sides. In some embodiments, along the winding direction V, the winding end of the second pole piece 105 may be provided with the second active material layer 1016 on one side. In some embodiments, along the winding direction V, the winding end of the second pole piece 105 may not be provided with the second active material layer 1016 on both sides.
  • the positive electrode active material layer includes positive electrode active materials.
  • the positive electrode active materials can be selected from various positive electrode active materials known in the art and can be used as electrochemical devices, which are not limited in this application.
  • the positive electrode active material includes at least one of lithium cobalt oxide, lithium manganese oxide, lithium iron phosphate, lithium manganese iron phosphate, lithium nickel cobalt manganate, lithium nickel cobalt aluminate or lithium nickel manganese oxide, and the above positive electrode active material can be Doped and/or coated.
  • the negative electrode active material includes at least one of carbonaceous material, silicon carbon material, alloy material, and lithium-containing metal composite oxide material, but is not limited thereto.
  • the negative electrode active material can be selected from various known in the art and can be used as a
  • a negative electrode active material of a chemical device is a conventionally known material capable of electrochemically intercalating and deintercalating active ions.
  • the thickness of the first insulating layer 11 may be less than or equal to the thickness of the second active material layer 1016 . In some embodiments, the thickness difference between the first insulating layer 11 and the second active material layer 1016 may be 0 ⁇ m to 50 ⁇ m. Controlling the thickness of the first insulating layer 11 can improve the flatness of the electrode assembly 10 while balancing the safety performance of the electrochemical device 100 and the material cost of the first insulating layer.
  • the thickness of the first insulating layer 11 may be 5 ⁇ m to 150 ⁇ m
  • the thickness of the second insulating layer 12 may be 5 ⁇ m to 150 ⁇ m. Controlling the thicknesses of the first insulating layer 11 and the second insulating layer 12 within this range can make the second pole piece 105 have greater resistance and therefore better safety, and meanwhile the electrode assembly 10 has better flatness.
  • the first insulating layer 11 includes an inorganic material and a binder, the mass percentage of the inorganic material ranges from 85% to 97%, and the mass percentage of the binder ranges from 3% to 15%.
  • inorganic materials include alumina, silica, magnesia, titania, hafnium oxide, tin oxide, ceria, nickel oxide, zinc oxide, calcium oxide, zirconia, yttrium oxide, carbide At least one of silicon, boehmite, aluminum hydroxide, magnesium hydroxide, calcium hydroxide or barium sulfate.
  • the binder includes a homopolymer of vinylidene fluoride, a copolymer of vinylidene fluoride, a copolymer of hexafluoropropylene, polystyrene, polyphenylene vinylene, sodium polyvinate, potassium polyvinate, At least one of polyacrylate, polyacrylic acid, polyacrylonitrile, polyvinylpyrrolidone, polyvinyl ether, polymethylmethacrylate, polyethylene, polypropylene or polytetrafluoroethylene.
  • the fourth insulating layer 14 may have a thickness of 3 ⁇ m to 15 ⁇ m
  • the fifth insulating layer 15 may have a thickness of 3 ⁇ m to 15 ⁇ m. In this way, the influence on the energy density of the electrochemical device 100 can be reduced while improving the safety performance of the electrochemical device 100 .

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Composite Materials (AREA)
  • Secondary Cells (AREA)
  • Connection Of Batteries Or Terminals (AREA)
  • Battery Electrode And Active Subsutance (AREA)

Abstract

La présente invention concerne un appareil électrochimique et un appareil électronique. L'appareil électrochimique comprend une première pièce polaire, un séparateur et une seconde pièce polaire ; la première pièce polaire comprend une première couche, et une première rainure est formée dans la première couche ; la seconde pièce polaire comprend une seconde couche, et la seconde couche est disposée de façon à faire face à la première couche ; la seconde couche comprend une première couche isolante qui est disposée de façon à faire face à la première rainure ; et dans une direction d'épaisseur, la projection de la première couche isolante chevauche au moins partiellement la saillie de la première rainure. L'appareil électrochimique de la présente invention présente des performances de charge et de décharge améliorées et une performance de sécurité améliorée.
PCT/CN2021/105036 2021-07-07 2021-07-07 Appareil électrochimique et appareil électronique le comprenant WO2023279298A1 (fr)

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JP2018018646A (ja) * 2016-07-27 2018-02-01 マクセルホールディングス株式会社 リチウムイオン二次電池
CN110729447A (zh) * 2019-10-09 2020-01-24 惠州锂威新能源科技有限公司 一种电芯极片及电芯
CN211507765U (zh) * 2020-04-03 2020-09-15 珠海冠宇电池股份有限公司 卷芯结构
CN112534606A (zh) * 2020-03-12 2021-03-19 宁德新能源科技有限公司 电极组件和电池

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CN111525194B (zh) * 2020-04-28 2022-05-20 宁德新能源科技有限公司 电化学装置以及包括所述电化学装置的电子装置

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CN203733894U (zh) * 2014-01-17 2014-07-23 宁德新能源科技有限公司 锂离子电池
JP2018018646A (ja) * 2016-07-27 2018-02-01 マクセルホールディングス株式会社 リチウムイオン二次電池
CN110729447A (zh) * 2019-10-09 2020-01-24 惠州锂威新能源科技有限公司 一种电芯极片及电芯
CN112534606A (zh) * 2020-03-12 2021-03-19 宁德新能源科技有限公司 电极组件和电池
CN211507765U (zh) * 2020-04-03 2020-09-15 珠海冠宇电池股份有限公司 卷芯结构

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