WO2023150970A1 - 电芯、电池及用电设备 - Google Patents

电芯、电池及用电设备 Download PDF

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Publication number
WO2023150970A1
WO2023150970A1 PCT/CN2022/075852 CN2022075852W WO2023150970A1 WO 2023150970 A1 WO2023150970 A1 WO 2023150970A1 CN 2022075852 W CN2022075852 W CN 2022075852W WO 2023150970 A1 WO2023150970 A1 WO 2023150970A1
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WIPO (PCT)
Prior art keywords
adhesive layer
thinned area
area
thinned
groove
Prior art date
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Ceased
Application number
PCT/CN2022/075852
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English (en)
French (fr)
Inventor
彭伟佳
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ningde Amperex Technology Ltd
Original Assignee
Ningde Amperex Technology Ltd
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
Publication date
Application filed by Ningde Amperex Technology Ltd filed Critical Ningde Amperex Technology Ltd
Priority to PCT/CN2022/075852 priority Critical patent/WO2023150970A1/zh
Priority to CN202280005027.2A priority patent/CN115843394B/zh
Publication of WO2023150970A1 publication Critical patent/WO2023150970A1/zh
Priority to US18/799,166 priority patent/US20240405255A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H01M10/0431—Cells with wound or folded electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • 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
    • 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
    • H01M10/058—Construction or manufacture
    • H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
    • 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
    • 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
    • H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
    • H01M4/621—Binders
    • 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
    • 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
    • H01M2004/021—Physical characteristics, e.g. porosity, surface area
    • 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 technical field of batteries, in particular to a battery cell, a battery and an electric device.
  • tab grooves are usually provided in the active material layer of the pole piece, and the tabs are fixed in the long grooves of the tabs to reduce the accumulation of the thickness of the tabs.
  • the lug groove is generally made by gap coating. Due to the different thinning mechanism of the head and tail, it is difficult to control the thinning of the head compared with the thinning of the tail, so that at least one of the active material layers on both sides of the lug groove The thickness is abnormal, resulting in lithium precipitation at this position.
  • An embodiment of the present application provides a battery cell, including a first pole piece.
  • the first pole piece includes a first current collector and a first active material layer.
  • the first current collector includes a first surface.
  • the first active material layer includes a first part and a second part.
  • the length direction of the expanded first current collector is the first direction.
  • the first part and the second part are arranged on the first surface at intervals along the first direction.
  • the first part and the second A first groove exposing the first surface is formed between the parts. Along the first direction, the part of the first part adjacent to the first groove is provided with a first thinned area, and the part of the second part adjacent to the first groove is provided with a second thinned area.
  • the thickness direction of the first current collector is the second direction, and along the second direction, the thickness of the second thinned area is greater than the thickness of the first thinned area.
  • the electric core also includes a first adhesive layer, the first adhesive layer is bonded to the first thinned area and extends from the first thinned area to the second thinned area, and part of the first adhesive layer covers the first groove .
  • the length L1 of the first adhesive layer adhered to the first thinned area is smaller than the length L2 of the first adhesive layer adhered to the second thinned area.
  • L1 ⁇ L2 can increase the coverage of the first glue layer while satisfying that the first glue layer completely covers both sides of the first groove along the first direction
  • the area of the second thinned area reduces the risk of lithium precipitation in the second thinned area, and also reduces the area covered by the first glue layer to increase the energy density of the battery.
  • the first pole piece further includes a second active material layer.
  • the first current collector further includes a second surface, and the second surface is opposite to the first surface along the second direction.
  • the second active material layer includes a third part and a fourth part. The third part and the fourth part are spaced apart on the second surface along the first direction, and a second groove exposing the second surface is formed between the third part and the fourth part.
  • the part of the third part adjacent to the second groove is provided with a third thinned area
  • the part of the fourth part adjacent to the second groove is provided with a fourth thinned area.
  • the thickness of the third thinned region is greater than the thickness of the fourth thinned region.
  • the electric core also includes a second adhesive layer, the second adhesive layer is bonded to the third thinned area and extends from the third thinned area to the fourth thinned area, and part of the second adhesive layer covers the second groove .
  • the length L3 of the second adhesive layer bonded to the third thinned area is greater than the length L4 of the second adhesive layer bonded to the fourth thinned area.
  • L3>L4 can increase the coverage of the second groove while satisfying that the second glue layer completely covers both sides of the second groove along the first direction
  • the area of the third thinning area reduces the risk of lithium precipitation in the third thinning area, and also reduces the area covered by the second glue layer in the fourth thinning area, thereby increasing the energy density of the battery.
  • the third thinned area is opposite to the first thinned area
  • the fourth thinned area is opposite to the second thinned area
  • the projection of the first groove overlaps with the projection of the second groove, so as to facilitate the positioning of the first groove and the second groove during the preparation process of the first pole piece position, simplify the preparation process of pole pieces, and improve production efficiency.
  • L2 L3, which can further define that the first adhesive layer and the second adhesive layer are arranged in a dislocation in the first direction.
  • the difference between the length L1 of the first adhesive layer bonded to the first thinned area and the length L3 of the second adhesive layer bonded to the third thinned area is A, 1mm ⁇
  • ⁇ 1mm the two are basically aligned and glued, which is consistent with the existing glue application method.
  • the second glue layer covers the third thinned area it will cause the first glue layer to cover the first thinned area.
  • the area of the thin region increases, which in turn causes a loss in the energy density of the battery.
  • the difference between the length L2 of the first adhesive layer bonded to the second thinned area and the length L4 of the second adhesive layer bonded to the fourth thinned area is B, 1mm ⁇
  • ⁇ 1mm the two are basically aligned and glued, which is consistent with the existing glue application method.
  • the first glue layer covers the second thinning area the second glue layer will cover the fourth thinning area.
  • the area of the thin region increases, which in turn causes a loss in the energy density of the battery.
  • the second adhesive layer covers the fourth thinned area it will cause the first adhesive layer or the second part of other normal areas, which will affect the energy density of the battery. cause loss.
  • the first pole piece is a positive pole piece or a negative pole piece.
  • Embodiments of the present application also provide a battery, including a casing and the battery cell in any one of the above embodiments, and the battery cell is arranged in the casing.
  • Embodiments of the present application also provide an electric device, including the battery in any one of the foregoing embodiments.
  • the length of the first adhesive layer adhered to the first thinned area is shorter than the length of the first adhesive layer adhered to the second thinned area.
  • L1 ⁇ L2 can increase the coverage of the first glue layer while satisfying that the first glue layer completely covers both sides of the first groove along the first direction
  • the area of the second thinned area reduces the risk of lithium precipitation in the second thinned area, and also reduces the area covered by the first glue layer to increase the energy density of the battery.
  • FIG. 1 is a schematic diagram of a first structure of a battery cell according to an embodiment of the present application.
  • Fig. 2 is a schematic diagram of a first structure of a first pole piece in a battery cell according to an embodiment of the present application.
  • Fig. 3 is a second structural schematic diagram of a battery cell according to an embodiment of the present application.
  • Fig. 4 is a second structural schematic diagram of the first pole piece in the battery cell according to an embodiment of the present application.
  • FIG. 5 is a schematic diagram of a third structure of a battery cell according to an embodiment of the present application.
  • Fig. 6 is a schematic structural diagram of a first pole piece and a second pole piece in a battery cell according to an embodiment of the present application.
  • Fig. 7 is a schematic structural diagram of an electrical device according to an embodiment of the present application.
  • the first active material layer 12 is the first active material layer 12
  • the first thinning zone 121a The first thinning zone 121a
  • the third thinning zone 141a The third thinning zone 141a
  • the fourth thinning zone 142a The fourth thinning zone 142a
  • the first adhesive layer 41 is the first adhesive layer 41
  • the third adhesive layer 51 is the third adhesive layer 51
  • the fourth adhesive layer 52 is the fourth adhesive layer 52
  • This application relates to the thinned area of the active material layer.
  • the coating solution is usually coated on the current collector by extrusion coating to form an active material layer. material layer.
  • part of the current collector does not need to be coated with coating liquid, and intermittent coating can be used during coating. Intermittent coating can be controlled by the coating valve, which is alternately opened and closed for coating. From the moment the coating valve is opened to the steady outflow of the coating liquid, the coating liquid coated on the current collector is unstable. At this time, the area formed by coating the coating liquid on the current collector is called the thinning area. .
  • the thickness of the thinned zone is generally lower than that of the normal zone.
  • An embodiment of the present application provides a battery cell, including a first pole piece.
  • the first pole piece includes a first current collector and a first active material layer.
  • the first current collector includes a first surface.
  • the first active material layer includes a first part and a second part.
  • the length direction of the expanded first current collector is the first direction.
  • the first part and the second part are arranged on the first surface at intervals along the first direction.
  • the first part and the second A first groove exposing the first surface is formed between the parts. Along the first direction, the part of the first part adjacent to the first groove is provided with a first thinned area, and the part of the second part adjacent to the first groove is provided with a second thinned area.
  • the thickness direction of the first current collector is the second direction, and along the second direction, the thickness of the second thinned area is greater than the thickness of the first thinned area.
  • the electric core also includes a first adhesive layer, the first adhesive layer is bonded to the first thinned area and extends from the first thinned area to the second thinned area, and part of the first adhesive layer covers the first groove .
  • the length L1 of the first adhesive layer adhered to the first thinned area is smaller than the length L2 of the first adhesive layer adhered to the second thinned area.
  • L1 ⁇ L2 can meet the requirement that the first glue layer completely cover both sides of the first groove along the first direction, and at the same time increase the
  • the first adhesive layer covers the area of the second thinned area, reducing the risk of lithium deposition in the second thinned area, and can also reduce the area covered by the first adhesive layer to increase the energy density of the battery.
  • An embodiment of the present application provides a battery cell 100 , including a first pole piece 10 , a second pole piece 20 and an isolation film 30 .
  • the isolation film 30 is located between the first pole piece 10 and the second pole piece 20 .
  • the polarity of the first pole piece 10 and the second pole piece 20 are opposite.
  • the first pole piece 10 , the second pole piece 20 and the separator 30 are wound and arranged in sequence.
  • first pole piece 10 the second pole piece 20 and the isolation film 30 are stacked in sequence.
  • the first pole piece 10 includes a first current collector 11 and a first active material layer 12 .
  • the first current collector 11 includes a first surface 11a.
  • the first active material layer 12 may allow extraction and intercalation of lithium ions.
  • the first current collector 11 guides the current generated by the electrochemical reaction to an external circuit, thereby realizing the process of converting chemical energy into electrical energy.
  • the first active material layer 12 includes a first portion 121 and a second portion 122 .
  • the length direction of the deployed first current collector 11 is the first direction X
  • the width direction of the deployed first current collector 11 is the third direction Y.
  • the “length direction” and “width direction” of the first current collector 11 respectively refer to two dimensions of the surface of the first current collector 11 .
  • the length direction refers to the main dimension direction (ie, the direction with larger size)
  • the width direction refers to the secondary dimension direction (ie, the direction with smaller size).
  • the length direction is consistent with the coating direction of the first active material layer 12 and also with the winding direction.
  • the width direction is perpendicular to the length direction.
  • the first portion 121 and the second portion 122 are disposed on the first surface 11 a at intervals along the first direction X, and a first groove 13 exposing the first surface 11 a is formed between the first portion 121 and the second portion 122 .
  • the first groove 13 is provided through.
  • the first groove 13 is used to accommodate components such as tabs, and the part of the first surface 11a located in the first groove 13 is used to electrically connect to components such as tabs.
  • the part of the first part 121 adjacent to the first groove 13 is provided with a first thinned area 121a
  • the part of the second part 122 adjacent to the first groove 13 is provided with a second thinned area 122a .
  • the thickness direction of the first current collector 11 is the second direction Z.
  • the thickness of the first thinned region 121 a is smaller than that of other normal regions of the first portion 121
  • the thickness of the second thinned region 122 a is smaller than that of other normal regions of the second portion 122
  • the thickness of the second thinned area 122a is greater than the thickness of the first thinned area 121a.
  • the electric core 100 also includes a first adhesive layer 41, the first adhesive layer 41 is bonded to the first thinned area 121a and extends from the first thinned area 121a to the second thinned area 122a, and part of the first adhesive layer 41 Cover the first groove 13. Specifically, along the second direction Z, the projections of the first thinned area 121 a , the first groove 13 , and the second thinned area 122 a are all within the projection range of the first adhesive layer 41 .
  • the part of the first adhesive layer 41 bonded to the first thinned area 121a is used to insulate and isolate the first thinned area 121a from the area of the second pole piece 20 facing the first thinned area 121a, so as to lower the first thinned area 121a There is a risk of lithium precipitation.
  • the part of the first adhesive layer 41 covering the first groove 13 is used to insulate and isolate the first surface 11 a exposed in the first groove 13 and connect to the components in the first groove 13 .
  • the part of the first adhesive layer 41 bonded to the second thinned area 122a is used to insulate and isolate the second thinned area 122a from the area of the second pole piece 20 facing the second thinned area 122a, so as to reduce the second thinned area 122a There is a risk of lithium precipitation.
  • the second thinned region 122a can provide more lithium ions during the charge and discharge process, resulting in the second thinned region 122a being more likely to produce lithium.
  • the length L1 of the first adhesive layer 41 bonded to the first thinned area 121 a is shorter than the length L2 of the first adhesive layer 41 bonded to the second thinned area 122 a.
  • L1 ⁇ L2 can meet the requirement that the first glue layer 41 completely cover both sides of the first groove 13 along the first direction X, and at the same time increase the first
  • the adhesive layer 41 covers the area of the second thinned region 122a, which reduces the risk of lithium precipitation in the second thinned region 122a, and also reduces the area covered by the first adhesive layer 41 to the first thinned region 121a, improving the energy density of the battery .
  • the usage amount of the first adhesive layer 41 can also be reduced, reducing the production cost.
  • L1 may be one of 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, and other arbitrary values within this range.
  • L2 may be one of 0.5mm, 1mm, 2.5mm, 5mm, 7.5mm, 10mm, 12.5mm, 15mm, 17.5mm, 20mm, and other arbitrary values within this range.
  • the first pole piece 10 further includes a second active material layer 14 .
  • the first current collector 11 also includes a second surface 11b.
  • the second surface 11b is opposite to the first surface 11a along the second direction Z.
  • the polarity of the second active material layer 14 is the same as that of the first active material layer 12 , which can allow extraction and insertion of lithium ions.
  • the second active material layer 14 includes a third part 141 and a fourth part 142, the third part 141 and the fourth part 142 are arranged at intervals along the first direction X on the second surface 11b, between the third part 141 and the fourth part 142 A second groove 15 exposing the second surface 11b is formed.
  • the second groove 15 is used to accommodate components such as tabs, and the part of the second surface 11b located in the second groove 15 is used to electrically connect to components such as tabs.
  • the part of the third part 141 adjacent to the second groove 15 is provided with a third thinned area 141a
  • the part of the fourth part 142 adjacent to the second groove 15 is provided with a fourth thinned area 142a.
  • the thickness of the third thinned area 141a is greater than the thickness of the fourth thinned area 142a.
  • the electric core 100 also includes a second adhesive layer 42, the second adhesive layer 42 is bonded to the third thinned area 141a and extends from the third thinned area 141a to the fourth thinned area 142a, and part of the second adhesive layer 42 Cover the second groove 15. Specifically, along the second direction Z, the projection of the third thinned region 141 a , the projection of the second groove 15 , and the projection of the fourth thinned region 142 a are all within the projection range of the second adhesive layer 42 .
  • the part of the second adhesive layer 42 bonded to the third thinned area 141a is used to insulate and isolate the third thinned area 141a from the area of the second pole piece 20 facing the third thinned area 141a, so as to lower the third thinned area 141a There is a risk of lithium precipitation.
  • the second adhesive layer 42 covers the part of the second groove 15 for insulating and isolating the second surface 11 b exposed in the second groove 15 and connecting the components in the second groove 15 .
  • the part of the second adhesive layer 42 bonded to the fourth thinned area 142a is used to insulate and isolate the fourth thinned area 142a from the area of the second pole piece 20 facing the fourth thinned area 142a, so as to reduce the fourth thinned area 142a There is a risk of lithium precipitation.
  • the third thinned region 141a can provide more lithium ions during the charge and discharge process, resulting in the third thinned region 141a being more likely to produce lithium.
  • the length L3 of the second adhesive layer 42 bonded to the third thinned area 141a is greater than the length L4 of the second adhesive layer 42 bonded to the fourth thinned area 142a.
  • L3>L4 can satisfy the requirement that the second glue layer 42 completely covers both sides of the second groove 15 along the first direction X, while increasing the second The groove 15 covers the area of the third thinned region 141a, which reduces the risk of lithium precipitation in the third thinned region 141a, and also reduces the area covered by the second glue layer 42 to the fourth thinned region 142a, improving the energy density of the battery .
  • L3 may be one of 0.5mm, 1mm, 2.5mm, 5mm, 7.5mm, 10mm, 12.5mm, 15mm, 17.5mm, 20mm, and other arbitrary values within this range.
  • L4 may be one of 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, and other arbitrary values within this range.
  • the third thinned area 141a is opposite to the first thinned area 121a
  • the fourth thinned area 142a is opposite to the second thinned area 122a , so that the first adhesive layer 41 and the second adhesive layer 42 are misaligned in the first direction X.
  • the part of the second adhesive layer 42 adhered to the third thinned area 141a exceeds the portion of the first adhesive layer 41 adhered to the first thinned area 121a, and the first adhesive layer 41 is adhered to The portion connected to the second thinned area 122a exceeds the portion of the second adhesive layer 42 bonded to the fourth thinned area 142a.
  • reducing the area of the first adhesive layer 41 covering the first thinning area 121a and reducing the area of the second adhesive layer 42 covering the fourth thinning area 142a can reduce the generation of lithium precipitation. risk while increasing the energy density of the battery.
  • the projection of the first groove 13 overlaps with the projection of the second groove 15, so as to facilitate the preparation process of the first pole piece 10
  • the position of the first groove 13 and the second groove 15 is positioned in the center, the preparation process of the pole piece is simplified, and the production efficiency is improved.
  • the third thinned area 141a and the first thinned area 121a are located on one side of the first groove 13, and the fourth thinned area 142a and the second thinned area 122a are located on the first groove. 13 on the other side.
  • the second groove 15 can also be used as a reference instead of the first groove 13, the third thinning area 141a and the first thinning area 121a are located on one side of the second groove 15, and the fourth thinning area 142a It is located on the other side of the second groove 15 from the second thinned area 122a.
  • the length L1 of the first adhesive layer 41 bonded to the first thinned area 121a and the length L3 of the second adhesive layer 42 bonded to the third thinned area 141a The difference is A, 1mm ⁇
  • ⁇ 1mm the two are basically aligned and glued, which is consistent with the existing glue application method.
  • the second glue layer 42 covers the third thinned area 141a it will cause the first glue layer 41 to cover The area of the first thinned region 121a increases, thereby causing a loss in the energy density of the battery.
  • can be one of 1.5mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14.5mm, and other arbitrary values within this range.
  • the difference between the length L2 of the first adhesive layer 41 bonded to the second thinned area 122a and the length L4 of the second adhesive layer 42 bonded to the fourth thinned area 142a is B, 1mm ⁇
  • ⁇ 1mm the two are basically aligned and glued, which is consistent with the existing glue application method.
  • the first glue layer 41 covers the second thinned area 122a, it will cause the second glue layer 42 to cover The area of the fourth thinned region 142a increases, which in turn causes a loss in the energy density of the battery.
  • can be one of 1.5mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14.5mm, and other arbitrary values within this range.
  • the battery cell 100 further includes a first tab 61, at least part of the first tab 61 is located in the first groove 13 or the second groove 15, and the electrical Connect the first current collector 11. Specifically, at least part of the first tab 61 is electrically connected to the first surface 11a located in the first groove 13; or at least part of the first tab 61 is electrically connected to the second surface 11b located in the second groove 15 part of the.
  • the first tab 61 is accommodated by the first groove 13 or the second groove 15, which improves the stability of the electrical connection.
  • the battery cell 100 further includes a third adhesive layer 51, and the third adhesive layer 51 is bonded to the area of the second pole piece 20 facing the first glue layer 41, so that the first glue layer 51 on the first pole piece 10
  • the area covered by the layer 41 is insulated from the area of the second pole piece 20 facing the first adhesive layer 41 to reduce the risk of lithium deposition.
  • both sides of the third adhesive layer 51 exceed both sides of the first adhesive layer 41, so that the first pole piece 10 and the second pole piece 20 may When a displacement occurs between them, the third adhesive layer 51 can still play the role of insulation and isolation, improving the stability of the insulation.
  • the battery cell 100 further includes a fourth adhesive layer 52, and the fourth adhesive layer 52 is bonded to the area of the second pole piece 20 facing the second glue layer 42, so that the second glue layer on the first pole piece 10 The area covered by the layer 42 is insulated from the area of the second pole piece 20 facing the second glue layer 42 to reduce the risk of lithium deposition.
  • both sides of the fourth adhesive layer 52 extend beyond both sides of the second adhesive layer 42, so that the first pole piece 10 and the second pole piece 20 can When there is a displacement between them, the fourth adhesive layer 52 can still play the role of insulation and isolation, improving the stability of the insulation.
  • the first pole piece 10 is a positive pole piece
  • the second pole piece 20 is a negative pole piece.
  • the second pole piece 20 is a positive pole piece.
  • both the positive electrode sheet and the negative electrode sheet adopt the structural design in the above embodiment, which can comprehensively improve the risk of lithium precipitation while reducing the risk of lithium deposition.
  • the energy density of the battery can be understood that in some embodiments, both the positive electrode sheet and the negative electrode sheet adopt the structural design in the above embodiment, which can comprehensively improve the risk of lithium precipitation while reducing the risk of lithium deposition.
  • the energy density of the battery can be understood that in some embodiments, both the positive electrode sheet and the negative electrode sheet adopt the structural design in the above embodiment, which can comprehensively improve the risk of lithium precipitation while reducing the risk of lithium deposition.
  • the energy density of the battery can be understood that in some embodiments, both the positive electrode sheet and the negative electrode sheet adopt the structural design in the above embodiment, which can comprehensively improve the risk of lithium precipitation while reducing the risk of lithium deposition.
  • the energy density of the battery can be understood that in some embodiments, both the positive electrode sheet and the negative electrode sheet adopt the structural design in the above embodiment, which can comprehensively improve the risk
  • the first pole piece 10 is a negative pole piece
  • the second pole piece 20 is a positive pole piece
  • at least part of the first tab 61 is located in the second groove 15 .
  • 7mm.
  • the initial end of the first current collector 11 is provided with a blank area 111 not coated with the first active material layer 12 and the second active material layer 14 , and along the first direction X, the length of the blank area 111 is 15 mm.
  • the lengths of the third adhesive layer 51 and the fourth adhesive layer 52 are both 11 mm.
  • the first pole piece 10 is a positive pole piece
  • the second pole piece 20 is a negative pole piece
  • at least part of the first tab 61 is located in the first groove 13 .
  • 10mm.
  • the initial end of the first current collector 11 is provided with a blank area 111 not coated with the first active material layer 12 and the second active material layer 14 , and along the first direction X, the length of the blank area 111 is 15 mm.
  • the third embodiment please refer to Fig. 5 and Fig. 6 together, the first pole piece 10 is a positive pole piece, the second pole piece 20 is a negative pole piece, and the polarity of the second pole piece 20 and the first pole piece 10 are different However, the structures are the same. Taking the structure of the first pole piece 10 as an example, the structure of the second pole piece 20 can refer to the first pole piece 10 , which will not be repeated here.
  • the battery cell 100 also includes a second tab 62 , at least part of the second tab 62 is located in the first groove 13 of the second pole piece 20 .
  • 10mm.
  • an embodiment of the present application also provides a battery 200 , including a casing and the battery cell 100 in any one of the above-mentioned embodiments.
  • the battery cell 100 is accommodated in a housing (not shown).
  • an embodiment of the present application also provides an electric device 300 , including the battery 200 in the above embodiment.
  • the powered device 300 also includes a device body 90 , and the battery 200 is electrically connected to the device body 90 and supplies power to the device body 90 .
  • the electric device 300 may be an electronic device such as a mobile phone or a tablet computer, or a mobile device such as an electric vehicle.
  • the length L1 of the first adhesive layer 41 bonded to the first thinned area 121a is smaller than the length L1 of the first adhesive layer 41 Adhering to the length L2 of the second thinned area 122a.
  • L1 ⁇ L2 can satisfy the requirement that the first glue layer 41 completely covers both sides of the first groove 13 along the first direction X, and at the same time increase the first
  • the adhesive layer 41 covers the area of the second thinned region 122a, which reduces the risk of lithium precipitation in the second thinned region 122a, and also reduces the area covered by the first adhesive layer 41 to the first thinned region 121a, improving the energy density of the battery .

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Abstract

一种电芯，包括第一极片。第一极片包括第一集流体和第一活性材料层。第一集流体包括第一表面。第一活性材料层包括第一部分和第二部分，第一部分和第二部分沿第一方向间隔设于第一表面，第一部分和第二部分之间形成露出第一表面的第一凹槽。沿第一方向，第一部分与第一凹槽相邻的部分设有第一削薄区，第二部分与第一凹槽相邻的部分设有第二削薄区。沿第二方向，第二削薄区的厚度大于第一削薄区的厚度。电芯还包括第一胶层，第一胶层粘接于第一削薄区并自第一削薄区延伸至第二削薄区，且第一胶层的部分盖在第一凹槽上。本申请还提供设有电芯的电池和用电设备，可降低析锂的风险。

Description

电芯、电池及用电设备 技术领域
本申请涉及电池技术领域，特别涉及一种电芯、电池及用电设备。
背景技术
在电池的生产过程中，通常在极片活性材料层设置极耳凹槽，并将极耳固定在极耳长凹槽中来减少极耳厚度累积。极耳凹槽一般采用间隙涂布的方式制成，由于头尾削薄机理不同，导致头部削薄相对尾部削薄较难控制，从而使极耳凹槽两侧活性材料层中的至少一个厚度异常，导致该位置出现析锂。
发明内容
鉴于上述状况，有必要提供一种电芯，降低析锂的风险。
本申请的实施例提供一种电芯，包括第一极片。第一极片包括第一集流体和第一活性材料层。第一集流体包括第一表面。第一活性材料层包括第一部分和第二部分，展开后的第一集流体的长度方向为第一方向，第一部分和第二部分沿第一方向间隔设于第一表面，第一部分和第二部分之间形成露出第一表面的第一凹槽。沿第一方向，第一部分与第一凹槽相邻的部分设有第一削薄区，第二部分与第一凹槽相邻的部分设有第二削薄区。第一集流体的厚度方向为第二方向，沿第二方向，第二削薄区的厚度大于第一削薄区的厚度。电芯还包括第一胶层，第一胶层粘接于第一削薄区并自第一削薄区延伸至第二削薄区，且第一胶层的部分盖在第一凹槽上。沿第一方向，第一胶层粘接于第一削薄区的长度L1小于第一胶层粘接于第二削薄区的长度L2。
与现有的凹槽两侧贴胶长度一致的方式相比，L1＜L2，可在满足第一胶层完全覆盖第一凹槽沿第一方向的两侧的同时，增加第一胶层覆盖第二削薄区的面积，降低第二削薄区产生析锂的风险，并且还能降低第一胶层覆盖第一削薄区的面积，提 高电池的能量密度。
本申请的一些实施例中，0mm＜L1≤5mm，0.5mm≤L2≤20mm。
本申请的一些实施例中，第一极片还包括第二活性材料层。第一集流体还包括第二表面，第二表面和第一表面沿第二方向相对设置。第二活性材料层包括第三部分和第四部分。第三部分和第四部分沿第一方向间隔设于第二表面，第三部分和第四部分之间形成露出第二表面的第二凹槽。沿第一方向，第三部分与第二凹槽相邻的部分设有第三削薄区，第四部分与第二凹槽相邻的部分设有第四削薄区。沿第二方向，第三削薄区的厚度大于第四削薄区的厚度。电芯还包括第二胶层，第二胶层粘接于第三削薄区并自第三削薄区延伸至第四削薄区，且第二胶层的部分盖在第二凹槽上。沿第一方向，第二胶层粘接于第三削薄区的长度L3大于第二胶层粘接于第四削薄区的长度L4。
与现有的凹槽两侧贴胶长度一致的方式相比，L3＞L4，可在满足第二胶层完全覆盖第二凹槽沿第一方向的两侧的同时，增加第二凹槽覆盖第三削薄区的面积，降低第三削薄区产生析锂的风险，并且还能降低第二胶层覆盖第四削薄区的面积，提高电池的能量密度。
本申请的一些实施例中，0.5mm≤L3≤20mm，0mm＜L4≤5mm。
本申请的一些实施例中，沿第二方向，第三削薄区与第一削薄区相对，第四削薄区与第二削薄区相对，以使第一胶层和第二胶层在第一方向上错位设置。
本申请的一些实施例中，沿第二方向，第一凹槽的投影与第二凹槽的投影重叠设置，以便于在第一极片的制备过程中定位第一凹槽和第二凹槽的位置，简化极片的制备工序，提高生产效率。
本申请的一些实施例中，L2＝L3，可进一步限定第一胶层和第二胶层在第一方向上错位设置。
本申请的一些实施例中，第一胶层粘接于第一削薄区的长度L1与第二胶层粘接于第三削薄区的长度L3的差值为A，1mm＜|A|＜15mm。当|A|≤1mm时，二者基本对齐贴胶，与现有的贴胶方式一致，在满足第二胶层覆盖第三削薄区的前提下，会导致第一胶层覆盖第一削薄区的面积增大，进而对电池的能量密度造成损失。当|A|≥15mm时，二者错位过大，在满足第一胶层覆盖第一削薄区的前提下，会导致 第二胶层可能第三部分其他正常区，进而对电池的能量密度造成损失。
本申请的一些实施例中，第一胶层粘接于第二削薄区的长度L2与第二胶层粘接于第四削薄区的长度L4的差值为B，1mm＜|B|＜15mm。当|B|≤1mm时，二者基本对齐贴胶，与现有的贴胶方式一致，在满足第一胶层覆盖第二削薄区的前提下，会导致第二胶层覆盖第四削薄区的面积增大，进而对电池的能量密度造成损失。当|B|≥15mm时，二者错位过大，在满足第二胶层覆盖第四削薄区的前提下，会导致第一胶层可能第二部分其他正常区，进而对电池的能量密度造成损失。
本申请的一些实施例中，第一极片为正极极片或负极极片。
本申请的实施例还提供了一种电池，包括壳体和上述任一实施例中的电芯，电芯设置在壳体内。
本申请的实施例还提供了一种用电设备，包括上述任一实施例中的电池。
本申请的电芯、电池和用电设备中，沿第一方向，第一胶层粘接于第一削薄区的长度小于第一胶层粘接于第二削薄区的长度。与现有的凹槽两侧贴胶长度一致的方式相比，L1＜L2，可在满足第一胶层完全覆盖第一凹槽沿第一方向的两侧的同时，增加第一胶层覆盖第二削薄区的面积，降低第二削薄区产生析锂的风险，并且还能降低第一胶层覆盖第一削薄区的面积，提高电池的能量密度。
附图说明
图1是本申请的一个实施例的电芯的第一结构示意图。
图2是本申请的一个实施例的电芯中第一极片的第一结构示意图。
图3是本申请的一个实施例的电芯的第二结构示意图。
图4是本申请的一个实施例的电芯中第一极片的第二结构示意图。
图5是本申请的一个实施例的电芯的第三结构示意图。
图6是本申请的一个实施例的电芯中第一极片和第二极片的结构示意图。
图7是本申请的一个实施例的用电设备的结构示意图。
主要元件符号说明
电芯        100
电池                             200
用电设备                         300
第一极片                         10
第一集流体                       11
第一表面                         11a
第二表面                         11b
空白区                           111
第一活性材料层                   12
第一部分                         121
第一削薄区                       121a
第二部分                         122
第二削薄区                       122a
第一凹槽                         13
第二活性材料层                   14
第三部分                         141
第三削薄区                       141a
第四部分                         142
第四削薄区                       142a
第二凹槽                         15
第二极片                         20
隔离膜                           30
第一胶层                         41
第二胶层                         42
第三胶层                         51
第四胶层                         52
第一极耳                         61
第二极耳                         62
设备主体                         90
第一方向      X
第二方向      Z
第三方向      Y
如下具体实施方式将结合上述附图进一步说明本申请。
具体实施方式
下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行描述，显然，所描述的实施例仅是本申请一部分实施例，而不是全部的实施例。
需要说明的是，当一个元件被认为是“连接”另一个元件，它可以是直接连接到另一个元件或者可能同时存在居中设置的元件。当一个元件被认为是“设置在”另一个元件，它可以是直接设置在另一个元件上或者可能同时存在居中设置的元件。
除非另有定义，本文所使用的所有的技术和科学术语与属于本申请的技术领域的技术人员通常理解的含义相同。本文中在本申请的说明书中所使用的术语只是为了描述具体的实施例的目的，不是旨在于限制本申请。本文所使用的术语“和/或”包括一个或多个相关的所列项目的任意的和所有的组合。本文所使用的术语“垂直的”、“水平的”、“左”、“右”、“顶”、“底”以及类似的表述只是为了说明的目的，并不用于限制本申请。
可以理解，当两元件平行/垂直设置时沿同一方向设置，两元件之间可存在一定的夹角，两元件之间的允许存在0-±10％的公差，两元件大于、等于或小于允许存在0-±10％的公差。
本申请涉及活性材料层的削薄区，以下对本申请涉及到的削薄区进行简单说明：在电池的生产过程中，涂布液通常通过挤压涂布的方式涂覆在集流体上形成活性材料层。根据需要，集流体的部分位置不需要涂覆涂布液，涂布时可以采用间歇式涂覆的方式。间歇式涂覆可以通过涂布阀来控制的，利用涂布阀交替打开和关闭进行涂布。涂布阀开启的瞬间至涂布液稳定流出的过程中，涂布在集流体上的涂布液是不稳定的，此时涂布液涂布在集流体上形成的区域称为削薄区。削薄区的厚度一般低于正常区厚度。
并且由于间歇打开和关闭的瞬间，会造成管路内的涂布液液压不稳定，经常会 出现头尾厚薄不一致现象。
本申请的实施例提供了一种电芯，包括第一极片。第一极片包括第一集流体和第一活性材料层。第一集流体包括第一表面。第一活性材料层包括第一部分和第二部分，展开后的第一集流体的长度方向为第一方向，第一部分和第二部分沿第一方向间隔设于第一表面，第一部分和第二部分之间形成露出第一表面的第一凹槽。沿第一方向，第一部分与第一凹槽相邻的部分设有第一削薄区，第二部分与第一凹槽相邻的部分设有第二削薄区。第一集流体的厚度方向为第二方向，沿第二方向，第二削薄区的厚度大于第一削薄区的厚度。电芯还包括第一胶层，第一胶层粘接于第一削薄区并自第一削薄区延伸至第二削薄区，且第一胶层的部分盖在第一凹槽上。沿第一方向，第一胶层粘接于第一削薄区的长度L1小于第一胶层粘接于第二削薄区的长度L2。
上述电芯中，与现有的凹槽两侧贴胶长度一致的方式相比，L1＜L2，可在满足第一胶层完全覆盖第一凹槽沿第一方向的两侧的同时，增加第一胶层覆盖第二削薄区的面积，降低第二削薄区产生析锂的风险，并且还能降低第一胶层覆盖第一削薄区的面积，提高电池的能量密度。
结合附图，对本申请的实施例作进一步的说明。
请一并参阅图1和图2，本申请的一个实施例提供了一种电芯100，包括第一极片10、第二极片20和隔离膜30。隔离膜30位于第一极片10和第二极片20之间。第一极片10和第二极片20的极性相反。在一些实施例中，第一极片10、第二极片20和隔离膜30依序卷绕设置。
可以理解的是，在一些实施例中，第一极片10、第二极片20和隔离膜30依序堆叠设置。
在一些实施例中，第一极片10包括第一集流体11和第一活性材料层12。第一集流体11包括第一表面11a。第一活性材料层12可以允许锂离子的脱出和嵌入。第一集流体11将电化学反应所产生的电流导到外电路，从而实现化学能转化为电能的过程。
第一活性材料12层包括第一部分121和第二部分122。展开后的第一集流体11的长度方向为第一方向X，展开后的第一集流体11的宽度方向为第三方向Y。 第一集流体11的“长度方向”和“宽度方向”分别是指第一集流体11表面的两个维度。其中长度方向是指主要维度方向(即尺寸较大的方向)，而宽度方向是指次要维度方向(即尺寸较小的方向)。通常，长度方向与第一活性材料层12的涂覆方向一致，也与卷绕方向是一致。而宽度方向是与长度方向垂直设置。
第一部分121和第二部分122沿第一方向X间隔设于第一表面11a，第一部分121和第二部分122之间形成露出第一表面11a的第一凹槽13。沿第三方向Y，第一凹槽13贯通设置。第一凹槽13用于容纳极耳等元件，第一表面11a位于第一凹槽13中的部分用于电连接于极耳等元件。
沿第一方向X，第一部分121与第一凹槽13相邻的部分设有第一削薄区121a，第二部分122与第一凹槽13相邻的部分设有第二削薄区122a。第一集流体11的厚度方向为第二方向Z。沿第二方向Z，第一削薄区121a的厚度小于第一部分121其他正常区的厚度，第二削薄区122a的厚度小于第二部分122其他正常区的厚度。并且第二削薄区122a的厚度大于第一削薄区121a的厚度。
电芯100还包括第一胶层41，第一胶层41粘接于第一削薄区121a并自第一削薄区121a延伸至第二削薄区122a，且第一胶层41的部分盖在第一凹槽13上。具体地，沿第二方向Z，第一削薄区121a的投影、第一凹槽13的投影、以及第二削薄区122a的投影均位于第一胶层41的投影范围内。
第一胶层41粘接于第一削薄区121a的部分用于绝缘隔离第一削薄区121a与第二极片20朝向第一削薄区121a的区域，以降低第一削薄区121a产生析锂的风险。第一胶层41覆盖第一凹槽13的部分用于绝缘隔离第一凹槽13中露出的第一表面11a，以及连接于第一凹槽13中的元件。第一胶层41粘接于第二削薄区122a的部分用于绝缘隔离第二削薄区122a与第二极片20朝向第二削薄区122a的区域，以降低第二削薄区122a产生析锂的风险。
由于第二削薄区122a的厚度大于第一削薄区121a的厚度，第二削薄区122a在充放电过程中能够提供更多的锂离子，导致第二削薄区122a更容易产生析锂。沿第一方向X，第一胶层41粘接于第一削薄区121a的长度L1小于第一胶层41粘接于第二削薄区122a的长度L2。与现有的凹槽两侧贴胶长度一致的方式相比，L1＜L2，可在满足第一胶层41完全覆盖第一凹槽13沿第一方向X的两侧的同时， 增加第一胶层41覆盖第二削薄区122a的面积，降低第二削薄区122a产生析锂的风险，并且还能降低第一胶层41覆盖第一削薄区121a的面积，提高电池的能量密度。另外，还可降低第一胶层41的使用量，降低生产成本。
在一些实施例中，0mm＜L1≤5mm。可选地，L1可以为0.5mm、1mm、1.5mm、2mm、2.5mm、3mm、3.5mm、4mm、4.5mm、5mm、以及该范围内其他任意数值中的一个。0.5mm≤L2≤20mm。可选地，L2可以为0.5mm、1mm、2.5mm、5mm、7.5mm、10mm、12.5mm、15mm、17.5mm、20mm、以及该范围内其他任意数值中的一个。
请继续参阅图1和图2，在一些实施例中，第一极片10还包括第二活性材料层14。第一集流体11还包括第二表面11b。第二表面11b和第一表面11a沿第二方向Z相对设置。第二活性材料层14与第一活性材料层12的极性相同，可以允许锂离子的脱出和嵌入。
第二活性材料层14包括第三部分141和第四部分142，第三部分141和第四部分142沿第一方向X间隔设于第二表面11b，第三部分141和第四部分142之间形成露出第二表面11b的第二凹槽15。第二凹槽15用于容纳极耳等元件，第二表面11b位于第二凹槽15中的部分用于电连接于极耳等元件。
沿第一方向X，第三部分141与第二凹槽15相邻的部分设有第三削薄区141a，第四部分142与第二凹槽15相邻的部分设有第四削薄区142a。沿第二方向Z，第三削薄区141a的厚度大于第四削薄区142a的厚度。
电芯100还包括第二胶层42，第二胶层42粘接于第三削薄区141a并自第三削薄区141a延伸至第四削薄区142a，且第二胶层42的部分盖在第二凹槽15上。具体地，沿第二方向Z，第三削薄区141a的投影、第二凹槽15的投影、以及第四削薄区142a的投影均位于第二胶层42的投影范围内。
第二胶层42粘接于第三削薄区141a的部分用于绝缘隔离第三削薄区141a与第二极片20朝向第三削薄区141a的区域，以降低第三削薄区141a产生析锂的风险。第二胶层42覆盖在第二凹槽15的部分用于绝缘隔离第二凹槽15中露出的第二表面11b，以及连接于第二凹槽15中的元件。第二胶层42粘接于第四削薄区142a的部分用于绝缘隔离第四削薄区142a与第二极片20朝向第四削薄区142a的区域，以降低第四削薄区142a产生析锂的风险。
由于第三削薄区141a的厚度大于第四削薄区142a的厚度，第三削薄区141a在充放电过程中能够提供更多的锂离子，导致第三削薄区141a更容易产生析锂。沿第一方向X，第二胶层42粘接于第三削薄区141a的长度L3大于第二胶层42粘接于第四削薄区142a的长度L4。与现有的凹槽两侧贴胶长度一致的方式相比，L3＞L4，可在满足第二胶层42完全覆盖第二凹槽15沿第一方向X的两侧的同时，增加第二凹槽15覆盖第三削薄区141a的面积，降低第三削薄区141a产生析锂的风险，并且还能降低第二胶层42覆盖第四削薄区142a的面积，提高电池的能量密度。
在一些实施例中，0.5mm≤L3≤20mm。可选地，L3可以为0.5mm、1mm、2.5mm、5mm、7.5mm、10mm、12.5mm、15mm、17.5mm、20mm、以及该范围内其他任意数值中的一个。0mm＜L4≤5mm。可选地，L4可以为0.5mm、1mm、1.5mm、2mm、2.5mm、3mm、3.5mm、4mm、4.5mm、5mm、以及该范围内其他任意数值中的一个。
请继续参阅图1和图2，在一些实施例中，沿第二方向Z，第三削薄区141a与第一削薄区121a相对，第四削薄区142a与第二削薄区122a相对，以使第一胶层41和第二胶层42在第一方向X上错位设置。具体地，沿第一方向X，第二胶层42粘接于第三削薄区141a的部分超出第一胶层41粘接于第一削薄区121a的部分，且第一胶层41粘接于第二削薄区122a的部分超出第二胶层42粘接于第四削薄区142a的部分。与现有的对齐贴胶的方式相比，降低第一胶层41覆盖第一削薄区121a的面积以及降低第二胶层42覆盖第四削薄区142a的面积，可在降低产生析锂的风险的同时提高电池的能量密度。
请继续参阅图1和图2，在一些实施例中，沿第二方向Z，第一凹槽13的投影与第二凹槽15的投影重叠设置，以便于在第一极片10的制备过程中定位第一凹槽13和第二凹槽15的位置，简化极片的制备工序，提高生产效率。具体地，沿第一方向X，第三削薄区141a和第一削薄区121a位于第一凹槽13的一侧，第四削薄区142a与第二削薄区122a位于第一凹槽13的另一侧。可以理解的是，也可以第二凹槽15代替第一凹槽13作为参照，第三削薄区141a和第一削薄区121a位于第二凹槽15的一侧，第四削薄区142a与第二削薄区122a位于第二凹槽15的另一侧。
在一些实施例中，L2＝L3，和/或，L1＝L4。当L2＝L3和L1＝L4时，可进一步限定第一胶层41和第二胶层42在第一方向X上错位设置。
请继续参阅图1和图2，在一些实施例中，第一胶层41粘接于第一削薄区121a的长度L1与第二胶层42粘接于第三削薄区141a的长度L3的差值为A，1mm＜|A|＜15mm。当|A|≤1mm时，二者基本对齐贴胶，与现有的贴胶方式一致，在满足第二胶层42覆盖第三削薄区141a的前提下，会导致第一胶层41覆盖第一削薄区121a的面积增大，进而对电池的能量密度造成损失。当|A|≥15mm时，二者错位过大，在满足第一胶层41覆盖第一削薄区121a的前提下，会导致第二胶层42可能第三部分141其他正常区，进而对电池的能量密度造成损失。
可选地，|A|可以为1.5mm、2mm、3mm、4mm、5mm、6mm、7mm、8mm、9mm、10mm、11mm、12mm、13mm、14.5mm、以及该范围内其他任意数值中的一个。
在一些实施例中，第一胶层41粘接于第二削薄区122a的长度L2与第二胶层42粘接于第四削薄区142a的长度L4的差值为B，1mm＜|B|＜15mm。当|B|≤1mm时，二者基本对齐贴胶，与现有的贴胶方式一致，在满足第一胶层41覆盖第二削薄区122a的前提下，会导致第二胶层42覆盖第四削薄区142a的面积增大，进而对电池的能量密度造成损失。当|B|≥15mm时，二者错位过大，在满足第二胶层42覆盖第四削薄区142a的前提下，会导致第一胶层41可能第二部分122其他正常区，进而对电池的能量密度造成损失。
可选地，|B|可以为1.5mm、2mm、3mm、4mm、5mm、6mm、7mm、8mm、9mm、10mm、11mm、12mm、13mm、14.5mm、以及该范围内其他任意数值中的一个。
请继续参阅图1和图2，在一些实施例中，电芯100还包括第一极耳61，第一极耳61的至少部分位于第一凹槽13或第二凹槽15中，且电连接第一集流体11。具体地，第一极耳61的至少部分电连接于第一表面11a位于第一凹槽13中的部分；或第一极耳61的至少部分电连接于第二表面11b位于第二凹槽15中的部分。通过第一凹槽13或第二凹槽15容纳第一极耳61，提高电连接的稳定性。
在一些实施例中，电芯100还包括第三胶层51，第三胶层51粘接于第二极片20朝向第一胶层41的区域，以使第一极片10上第一胶层41覆盖的区域与第二极片20朝向第一胶层41的区域相互绝缘隔离，降低产生析锂的风险。
在一些实施例中，沿第一方向X，第三胶层51两侧均超出于第一胶层41两侧，以在电芯100碰撞等情况下第一极片10和第二极片20之间产生位移时，使第三胶层51仍能起到绝缘隔离的作用，提高绝缘的稳定性。
在一些实施例中，电芯100还包括第四胶层52，第四胶层52粘接于第二极片20朝向第二胶层42的区域，以使第一极片10上第二胶层42覆盖的区域与第二极片20朝向第二胶层42的区域相互绝缘隔离，降低产生析锂的风险。
在一些实施例中，沿第一方向X，第四胶层52两侧均超出于第二胶层42两侧，以在电芯100碰撞等情况下第一极片10和第二极片20之间产生位移时，使第四胶层52仍能起到绝缘隔离的作用，提高绝缘的稳定性。
在一些实施例中，第一极片10为正极极片，第二极片20为负极极片。
请一并参阅图3和图4，可以理解的是，在一些实施例中，当第一极片10为负极极片时，第二极片20为正极极片。
请一并参阅图5和图6，可以理解的是，在一些实施例中，正极极片和负极极片均采用上述实施例中的结构设计，可在降低产生析锂的风险的同时综合提高电池的能量密度。
下面通过具体实施方式说明本申请：
第一实施例：请一并参阅图1和图2，第一极片10为负极极片，第二极片20为正极极片，第一极耳61的至少部分位于第二凹槽15中。L1＝L4＝2mm；L2＝L3＝9mm；|A|＝|B|＝7mm。第一集流体11的起始端设有未涂覆第一活性材料层12和第二活性材料层14的空白区111，沿第一方向X，空白区111的长度为15mm。第三胶层51和第四胶层52的长度均为11mm。
第二实施例：请一并参阅图3和图4，第一极片10为正极极片，第二极片20为负极极片，第一极耳61的至少部分位于第一凹槽13中。L1＝L4＝2mm；L2＝L3＝12mm；|A|＝|B|＝10mm。第一集流体11的起始端设有未涂覆第一活性材料层12和第二活性材料层14的空白区111，沿第一方向X，空白区111的长度为15mm。
第三实施例：请一并参阅图5和图6，第一极片10为正极极片，第二极片20为负极极片，且第二极片20和第一极片10极性不同但结构相同，以第一极片10的结构为例，第二极片20的结构可参照第一极片10，在此不作赘述。
第一极耳61的至少部分位于第一极片10的第二凹槽15中。L1＝L4＝2mm；L2＝L3＝9mm；|A|＝|B|＝7mm。电芯100海包括第二极耳62，第二极耳62的至少部分位于第二极片20的第一凹槽13中。L1＝L4＝12mm；L2＝L3＝2mm；|A|＝|B|＝10mm。
请参阅图7，本申请的一个实施例还提供了一种电池200，包括壳体和上述任一项实施例中的电芯100。电芯100容纳于壳体(图未示)中。
请继续参阅图7，本申请的一个实施例还提供了一种用电设备300，包括上述实施例中的电池200。用电设备300还包括设备主体90，电池200电连接于设备主体90，且为设备主体90供电。在一些实施例中，用电设备300可以为手机、平板电脑等电子设备，或电动汽车等移动设备。
上述电芯100、以及设有电芯100的电池200和用电设备300中，沿第一方向X，第一胶层41粘接于第一削薄区121a的长度L1小于第一胶层41粘接于第二削薄区122a的长度L2。与现有的凹槽两侧贴胶长度一致的方式相比，L1＜L2，可在满足第一胶层41完全覆盖第一凹槽13沿第一方向X的两侧的同时，增加第一胶层41覆盖第二削薄区122a的面积，降低第二削薄区122a产生析锂的风险，并且还能降低第一胶层41覆盖第一削薄区121a的面积，提高电池的能量密度。
另外，本领域技术人员还可在本申请精神内做其它变化，当然，这些依据本申请精神所做的变化，都应包含在本申请所公开的范围。

Claims (12)

  1. 一种电芯，包括第一极片，其特征在于：
    所述第一极片包括第一集流体和第一活性材料层，所述第一集流体包括第一表面，所述第一活性材料层包括第一部分和第二部分，展开后的所述第一集流体的长度方向为第一方向，所述第一部分和所述第二部分沿所述第一方向间隔设于所述第一表面，所述第一部分和所述第二部分之间形成露出所述第一表面的第一凹槽；
    沿所述第一方向，所述第一部分与所述第一凹槽相邻的部分设有第一削薄区，所述第二部分与所述第一凹槽相邻的部分设有第二削薄区，所述第一集流体的厚度方向为第二方向，沿所述第二方向，所述第二削薄区的厚度大于所述第一削薄区的厚度；
    所述电芯还包括第一胶层，所述第一胶层粘接于所述第一削薄区并自所述第一削薄区延伸至所述第二削薄区，且所述第一胶层的部分盖在所述第一凹槽上，沿所述第一方向，所述第一胶层粘接于第一削薄区的长度L1小于所述第一胶层粘接于第二削薄区的长度L2。
  2. 如权利要求1所述的电芯，其特征在于：0mm＜L1≤5mm，0.5mm≤L2≤20mm。
  3. 如权利要求1所述的电芯，其特征在于：所述第一极片还包括第二活性材料层，所述第一集流体还包括第二表面，所述第二表面和所述第一表面沿所述第二方向相对设置，所述第二活性材料层包括第三部分和第四部分，所述第三部分和所述第四部分沿所述第一方向间隔设于所述第二表面，所述第三部分和所述第四部分之间形成露出所述第二表面的第二凹槽；
    沿所述第一方向，所述第三部分与所述第二凹槽相邻的部分设有第三削薄区，所述第四部分与所述第二凹槽相邻的部分设有第四削薄区，沿所述第二方向，所述第三削薄区的厚度大于所述第四削薄区的厚度；
    所述电芯还包括第二胶层，所述第二胶层粘接于所述第三削薄区并自所述第三削薄区延伸至所述第四削薄区，且所述第二胶层的部分盖在所述第二凹槽上，沿所述第一方向，所述第二胶层粘接于第三削薄区的长度L3大于所述第二胶层粘接于第四削薄区的长度L4。
  4. 如权利要求3所述的电芯，其特征在于：0.5mm≤L3≤20mm，0mm＜L4≤5mm。
  5. 如权利要求3所述的电芯，其特征在于：沿所述第二方向，所述第三削薄区与所述第一削薄区相对，所述第四削薄区与所述第二削薄区相对。
  6. 如权利要求3所述的电芯，其特征在于：沿所述第二方向，所述第一凹槽的投影与所述第二凹槽的投影重叠设置。
  7. 如权利要求3所述的电芯，其特征在于：L2＝L3。
  8. 如权利要求3所述的电芯，其特征在于：所述第一胶层粘接于第一削薄区的长度L1与所述第二胶层粘接于第三削薄区的长度L3的差值为A，1mm＜|A|＜15mm。
  9. 如权利要求3所述的电芯，其特征在于：所述第一胶层粘接于第二削薄区的长度L2与所述第二胶层粘接于第四削薄区的长度L4的差值为B，1mm＜|B|＜15mm。
  10. 如权利要求1至9中任一项所述的电芯，其特征在于：所述第一极片为正极极片或负极极片。
  11. 一种电池，包括壳体，其特征在于：所述电池还包括如权利要求1至10中任一所述的电芯，所述电芯设置在所述壳体内。
  12. 一种用电设备，其特征在于：包括如权利要求11所述的电池。
PCT/CN2022/075852 2022-02-10 2022-02-10 电芯、电池及用电设备 Ceased WO2023150970A1 (zh)

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