CN112542616A - Electrochemical device and electronic device - Google Patents

Electrochemical device and electronic device Download PDF

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Publication number
CN112542616A
CN112542616A CN202011407357.3A CN202011407357A CN112542616A CN 112542616 A CN112542616 A CN 112542616A CN 202011407357 A CN202011407357 A CN 202011407357A CN 112542616 A CN112542616 A CN 112542616A
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material layer
segment
active material
thickness
electrochemical device
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蔡阳声
陶涛
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Dongguan Poweramp Technology Ltd
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Dongguan Poweramp Technology Ltd
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • 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
    • 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

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

Abstract

Embodiments of the present application provide an electrochemical device and an electronic device. The electrochemical device includes an electrode assembly including a first pole piece, a second pole piece, and a separator disposed between the first pole piece and the second pole piece. The electrode assembly is in a winding structure, the separation film comprises n sections in sequence in the winding direction, n is an integer larger than 1, the thickness of the (n-1) th section is larger than that of the (n) th section, the (n-1) th section is closer to the first end of the separation film, the (n) th section is farther away from the first end of the separation film, and the first end of the separation film is positioned in the electrode assembly. The embodiment of the application enables the inside of the electrode assembly to store more electrolyte, namely, increases the liquid retaining amount of the inside of the electrode assembly by enabling the thickness of the separation film closer to the inside of the electrode assembly to be larger than that of the separation film farther from the inside of the electrode assembly, thereby better realizing the balance of the electrolyte in the circulation process.

Description

Electrochemical device and electronic device
Technical Field
The present application relates to the field of electrochemical technologies, and more particularly, to an electrochemical device and an electronic device.
Background
The electrochemical device can continuously consume electrolyte in the circulating process, and particularly during low-temperature circulation, the electrolyte inside the electrode assembly is consumed too fast and is not supplemented timely, so that the problems of poor infiltration, even lithium precipitation and the like are caused, and the service life and the safety and the reliability of the electrode assembly are seriously influenced.
Disclosure of Invention
According to the embodiment of the application, the effective compensation of the electrolyte is realized by adjusting the thickness of the isolating membrane of the electrode assembly, and the problem of an electrode assembly interface caused by the circulation consumption of the electrolyte is solved while typical dynamics, cost and energy density are considered.
Embodiments of the present application provide an electrochemical device including an electrode assembly. The electrode assembly includes a first pole piece, a second pole piece, and a separator disposed between the first pole piece and the second pole piece. The electrode assembly is in a winding structure, the separation film comprises n sections in sequence in the winding direction, n is an integer larger than 1, the thickness of the (n-1) th section is larger than that of the (n) th section, the (n-1) th section is closer to the first end of the separation film, the (n) th section is farther away from the first end of the separation film, and the first end of the separation film is positioned in the electrode assembly.
In some embodiments, the separator membrane comprises a porous substrate and a material layer disposed on the porous substrate, wherein the thickness of the material layer on the (n-1) th segment is greater than the thickness of the material layer on the (n) th segment. In some embodiments, the porous substrate includes a first side and a second side, the layer of material being disposed on at least one of the first side or the second side. In some embodiments, a layer of material is disposed on the first side, the thickness of the layer of material of the (n-1) th segment being greater than the thickness of the layer of material of the (n) th segment. In some embodiments, the material layer includes inorganic particles including at least one of alumina, silica, magnesia, titania, zirconia, barium oxide, magnesium hydroxide, or boehmite, and a binder.
In some embodiments, the intersection of the (n-1) th segment and the (n) th segment is located at the bending segment of the isolation diaphragm. In some embodiments, the material layer of the (n-1) th segment and the material layer of the (n) th segment are not in contact.
In some embodiments, the first pole piece comprises a first current collector and a first active material layer disposed on the first current collector, the second pole piece comprises a second current collector and a second active material layer disposed on the second current collector, at least one of the first active material layer or the second active material layer comprises m segments in sequence in the winding direction, m is an integer greater than 1, the m-1 segment is closer to the first end of the separator, and the m segment is further from the first end of the separator.
In some embodiments, the density of the (m-1) th segment is less than the density of the (m) th segment. In some embodiments, the thickness of the (m-1) th segment is less than or equal to the thickness of the (m) th segment. In some embodiments, the boundary between the (m-1) th segment and the (m) th segment is located at the bent segment of the first active material layer or the second active material layer.
In some embodiments, n segments of the separation film are matched in one-to-one correspondence with m segments of the first active material layer or the second active material layer, where n is equal to m. In some embodiments, the n segments of the separator are matched in one-to-one correspondence with the m segments of the first active material layer and the second active material layer, and the sum of the thicknesses of the respective corresponding segments of the separator, the first active material layer, and the second active material layer is the same, where n is equal to m.
Embodiments of the present application also provide an electronic device including the above electrochemical device.
The embodiment of the application enables the inside of the electrode assembly to store more electrolyte, namely, increases the liquid retaining amount of the inside of the electrode assembly by enabling the thickness of the separation film closer to the inside of the electrode assembly to be larger than that of the separation film farther from the inside of the electrode assembly, thereby better realizing the balance of the electrolyte in the circulation process.
Drawings
Fig. 1 shows an expanded front view of an electrochemical device of an embodiment of the present application.
Fig. 2 shows a top view of a separator of an embodiment of the present application.
Fig. 3 shows a front view of the separator of an embodiment of the present application along the winding direction.
Fig. 4 shows a front view of a separator film of another embodiment of the present application along a winding direction.
Fig. 5 shows a front view of a separator film of another embodiment of the present application along a winding direction.
Fig. 6 shows a schematic view of a separation film in an electrode assembly of an embodiment of the present application.
Fig. 7 shows a front view of an unrolled electrode assembly along a winding direction according to another embodiment of the present application.
Detailed Description
The following examples are presented to enable those skilled in the art to more fully understand the present application and are not intended to limit the present application in any way.
Fig. 1 shows a front view (cross-sectional view) of an electrochemical device of an embodiment of the present application. In some embodiments, the electrochemical device includes an electrode assembly 10. In some embodiments, the electrode assembly 10 may include a first pole piece 11, a second pole piece 12, and a separator 13, the separator 13 being disposed between the first pole piece 11 and the second pole piece 12. In some embodiments, one of the first and second pole pieces 11, 12 is a positive pole piece, and the other of the first and second pole pieces 11, 12 is a negative pole piece.
In some embodiments, the electrode assembly 10 is a wound structure, and the separator 13 includes n segments in sequence in the winding direction, n being an integer greater than 1, for example, 2, 3, 4 … …. In some embodiments, the thickness of the (n-1) th segment is greater than the thickness of the (n) th segment, the (n-1) th segment being closer to the first end of the separation film 13, the (n) th segment being further from the first end of the separation film 13, the first end of the separation film 13 being located inside or inside the electrode assembly 10. In the following, n-2 is taken as an example, but it should be understood that this is only for better illustration and is not intended to limit the embodiments of the present application. Fig. 3 shows a cross-sectional view of the separator 13 along the winding direction. As shown in fig. 3, the thickness of the first segment 131 is greater than that of the second segment 132, the first segment 131 is closer to the first end 1311 of the separator 13, the second segment 132 is farther from the first end 1311 of the separator 13, and the first end 1311 of the separator 13 is located inside or inside the electrode assembly 10. By making the thickness of the separation film 13 inside the electrode assembly 10 larger, the inside of the electrode assembly 10 can store more electrolyte, i.e., the amount of retention inside the electrode assembly 10 is increased, thereby better achieving the equalization of electrolyte during the circulation. It should be understood that although the thickness within the segments of the first segment 131 or the second segment 132 is shown in fig. 3 as varying, this is merely exemplary, and the thickness within the segments of the first segment 131 may be uniform, and the thickness within the segments of the second segment 132 may also be uniform.
In some embodiments, the thickness of the isolation diaphragm 13 may be measured by a micrometer. In some embodiments, the difference in thickness of portions within the same one of the sections of the separation film 13 may be, for example, 1 μm or less, 0.5 μm or less, or the like.
In some embodiments, the separator 13 includes a porous substrate 133 and a material layer 134 disposed on the porous substrate 133. In some embodiments, the thickness of the material layer 134 of the (n-1) th segment is greater than the thickness of the material layer 134 of the (n) th segment. For example, the thickness d1 of the material layer 134 of the first segment 131 is greater than the thickness d2 of the material layer 134 of the second segment 132, and since the thickness within each segment may not be uniform, the thickness of the segment may refer to the average thickness of the segment. In some embodiments, as shown in fig. 5, the thickness within the segments of the first segment 131 may be uniform, and the thickness within the segments of the second segment 132 may also be uniform. By making the thickness of the (n-1) th section closer to the inside of the electrode assembly 10 greater than that of the nth section farther from the inside of the electrode assembly 10, the inside of the electrode assembly 10 can store more electrolyte.
In some embodiments, the porous substrate 133 includes a first side 1331 and a second side 1332, with the material layer 132 disposed on at least one of the first side 1331 or the second side 1332. Thus, the material layer 134 may be disposed on one or both sides of the porous substrate 133. In some embodiments, the material layer 134 is disposed on the first side 1331, and the thickness of the material layer 134 of the (n-1) th segment is greater than the thickness of the material layer 134 of the (n) th segment. For example, the thickness d1 of the material layer 134 of the first segment 131 is greater than the thickness d2 of the material layer 134 of the second segment 132. By making the thickness of the material layer 134 of the n-1 th stage greater than that of the material layer 134 of the n-th stage, the thickness of the separation film inside the electrode assembly 10 is made greater, and more electrolyte can be stored inside the electrode assembly 10.
In some embodiments, the material layer 134 includes at least one of inorganic particles or a binder. In some embodiments, the inorganic particles comprise at least one of alumina, silica, magnesia, barium titanate, titania, zirconia, barium oxide, magnesium hydroxide, or boehmite. The inorganic particles are used to facilitate retention of the electrolyte. In some embodiments, the binder may include at least one of polyvinylidene fluoride, copolymers of vinylidene fluoride-hexafluoropropylene, polyamides, polyacrylonitriles, polyacrylates, polyacrylic acids, polyacrylates, sodium carboxymethylcellulose, polyvinylpyrrolidone, polyvinyl ether, polymethyl methacrylate, polytetrafluoroethylene, or polyhexafluoropropylene.
In some embodiments, the intersection of the (n-1) th segment and the (n) th segment is located at the inflection segment of the isolation diaphragm 13. For example, as shown in FIG. 6, the interface 135 of the first segment 131 and the second segment 132 is located at the bent segment of the isolation diaphragm 13. By locating the interface between the (n-1) th segment and the nth segment at the bent segment of the separator 13, the interface is prevented from being located on the main body surface of the electrode assembly 10, which leads to energy density loss of the electrode assembly 10. It should be understood that the electrode assembly in fig. 6 omits the positive and negative electrode tabs for simplicity.
In some embodiments, the material layer 134 of the n-1 th segment and the material layer 134 of the n-th segment are not in contact. That is, gaps may exist between different segments of the material layer 134. As long as the thickness of the material layer 134 of the n-1 th stage is greater than that of the material layer 134 of the n-th stage, the thickness of the separation film 13 at the inside of the electrode assembly 10 is made greater than that of the separation film 13 away from the inside of the electrode assembly 10, so that more electrolyte can be stored at the inside of the electrode assembly 10.
In some embodiments, the first pole piece 11 includes a first current collector 111 and a first active material layer 112 disposed on the first current collector 111, and the second pole piece 12 includes a second current collector 121 and a second active material layer 122 disposed on the second current collector 121. In some embodiments, in the roll-to-roll direction, at least one of the first active material layer 112 or the second active material layer 122 includes m segments in order, m being an integer greater than 1, e.g., 2, 3, 4 … …. In some embodiments, the (m-1) th segment is closer to first end 1311 of isolation diaphragm 13 and the (m) th segment is further from first end 1311 of isolation diaphragm 13. That is, the (m-1) th section is closer to the inside of the electrode assembly 10 than the (m) th section.
In some embodiments, the density of the (m-1) th segment is less than the density of the (m) th segment. That is, the density of the first active material layer 112 and/or the second active material layer 122 near the inside of the electrode assembly 10 is smaller. In some embodiments, the density of the active material layer is the mass of the active material layer per unit area. Therefore, the first active material layer 112 and/or the second active material layer 122 near the inside of the electrode assembly 10 consume less electrolyte, thereby further facilitating the achievement of the equilibrium of the electrolyte during the circulation. In addition, since the density of the active material layer outside the electronic component 10 is greater, the energy density of the electrode component 10 is also improved.
In some embodiments, the thickness of the (m-1) th segment is less than or equal to the thickness of the (m) th segment. For example, as shown in fig. 7, taking m 2 as an example, the thickness d3 of the first segment 1121 is smaller than or equal to the thickness d4 of the second segment 1122 in the first active material layer 112. That is, the thickness of the first active material layer 112 and/or the second active material layer 122 near the inside of the electrode assembly 10 may be smaller, so that the first active material layer 112 and/or the second active material layer 122 near the inside of the electrode assembly 10 consume less electrolyte, further facilitating the achievement of the balance of the electrolyte during the circulation. In addition, since the thickness of the active material layer outside the electronic component 10 is greater, the energy density of the electrode component 10 is also improved.
In some embodiments, the intersection of the (m-1) th segment and the (m) th segment is located at the inflection segment of the first active material layer 112 or the second active material layer 122. Referring to the description above regarding the separation film 13, by locating the boundary of the (m-1) th segment and the (m) th segment at the bent segment of the first active material layer 112 or the second active material layer 122, it is prevented that the boundary is located on the main body surface of the electrode assembly 10 to cause a loss of energy density of the electrode assembly 10.
In some embodiments, n segments of the separation film 10 are matched in one-to-one correspondence with m segments of the first active material layer 112 or the second active material layer 122, where n is equal to m. At this time, n may be equal to m, but embodiments of the present application are not limited thereto, and for example, n may be equal to 2m or 1/2m, or the like. In some embodiments, as shown in fig. 7, n segments of the separation film 13 are matched in one-to-one correspondence with m segments of the first active material layer 112 and the second active material layer 122, where n is equal to m, and the sum of the thicknesses of the respective segments of the separation film 13, the first active material layer 112, and the second active material layer 122 is the same. This achieves equalization of the overall thickness of the electrode assembly 10.
In some embodiments, as described above, one of the first and second pole pieces 11 and 12 is a positive pole piece and the other is a negative pole piece. The positive electrode current collector may be an aluminum foil, and of course, other positive electrode current collectors commonly used in the art may be used. In addition, the active material layer of the positive electrode sheet may include a positive electrode active material, a binder, and a conductive agent. The positive electrode active material may include at least one of lithium cobaltate, lithium manganate, lithium iron phosphate, lithium nickel cobalt manganate, lithium nickel cobalt aluminate, or lithium nickel manganate. The conductive agent in the active material layer of the positive electrode sheet may include at least one of conductive carbon black, ketjen black, flake graphite, graphene, carbon nanotubes, or carbon fibers. The binder in the active material layer of the positive electrode sheet may include at least one of polyvinylidene fluoride, a copolymer of vinylidene fluoride-fluorinated olefin, polytetrafluoroethylene, sodium carboxymethylcellulose, styrene-butadiene rubber, polyurethane, fluorinated rubber, or polyvinyl alcohol. In some embodiments, the mass ratio of the positive active material, the conductive agent and the binder in the active material layer of the positive pole piece can be 92-98.5: 0.5-3: 1 to 5. It should be understood that the above description is merely exemplary, and any other suitable material, thickness and mass ratio may be used for the active material layer of the positive electrode tab.
In some embodiments, the negative current collector of the negative electrode sheet may be at least one of a copper foil, a nickel foil or a carbon-based current collector, and of course, other negative current collectors commonly used in the art may also be used. In addition, the active material layer of the negative electrode tab may include a negative electrode active material, a binder, and a conductive agent. The negative active material may include at least one of artificial graphite, natural graphite, hard carbon, mesocarbon microbeads, a silicon alloy, a tin alloy, or pure silicon. The conductive agent in the active material layer of the negative electrode sheet may include at least one of conductive carbon black, ketjen black, flake graphite, graphene, carbon nanotubes, or carbon fibers. The binder in the active material layer of the negative electrode sheet may include at least one of polyvinylidene fluoride, a copolymer of vinylidene fluoride-fluorinated olefin, polyvinylpyrrolidone, polyacrylonitrile, polymethyl acrylate, polytetrafluoroethylene, sodium carboxymethylcellulose, styrene butadiene rubber, polyurethane, fluorinated rubber, or polyvinyl alcohol. In some embodiments, the mass ratio of the negative active material, the conductive agent and the binder in the active material layer of the negative pole piece can be 92-98.5: 0.5-3: 1 to 5. It will be appreciated that the above description is merely an example and that any other suitable mass ratio may be employed.
In some embodiments, the porous substrate 133 comprises at least one of polyethylene, polypropylene, polyvinylidene fluoride, polyethylene terephthalate, polyimide, or aramid. For example, the polyethylene includes at least one selected from high density polyethylene, low density polyethylene, or ultra high molecular weight polyethylene. Particularly polyethylene and polypropylene, which have a good effect on preventing short circuits and can improve the stability of the battery through a shutdown effect.
In some embodiments, the electrochemical device comprises a lithium ion battery, but the application is not so limited. In some embodiments, the electrochemical device may further include an electrolyte. The electrolyte may be one or more of a gel electrolyte, a solid electrolyte, and an electrolytic solution including a lithium salt and a non-aqueous solvent. The lithium salt is selected from LiPF6、LiBF4、LiAsF6、LiClO4、LiB(C6H5)4、LiCH3SO3、LiCF3SO3、LiN(SO2CF3)2、LiC(SO2CF3)3、LiSiF6One or more of LiBOB or lithium difluoroborate. For example, LiPF is selected as lithium salt6Since it can give high ionic conductivity and improve cycle characteristics.
The non-aqueous solvent may be selected from carbonate compounds, carboxylate compounds, ether compounds, other organic solvents, or combinations thereof.
The carbonate compound may be selected from a chain carbonate compound, a cyclic carbonate compound, a fluoro carbonate compound, or a combination thereof.
The chain carbonate compound may be selected from diethyl carbonate (DEC), dimethyl carbonate (DMC), dipropyl carbonate (DPC), Methyl Propyl Carbonate (MPC), Ethyl Propyl Carbonate (EPC), Methyl Ethyl Carbonate (MEC), and combinations thereof. Examples of the cyclic carbonate compound are Ethylene Carbonate (EC), Propylene Carbonate (PC), Butylene Carbonate (BC), Vinyl Ethylene Carbonate (VEC), or a combination thereof. The fluoro carbonate compound may be selected from Fluoro Ethylene Carbonate (FEC), 1, 2-difluoroethylene carbonate, 1, 2-trifluoroethylene carbonate, 1,2, 2-tetrafluoroethylene carbonate, 1-fluoro-2-methylethylene carbonate, 1-fluoro-1-methylethylene carbonate, 1, 2-difluoro-1-methylethylene carbonate, 1, 2-trifluoro-2-methylethylene carbonate, trifluoromethyl ethylene carbonate, or a combination thereof.
The carboxylate compound may be selected from methyl acetate, ethyl acetate, n-propyl acetate, t-butyl acetate, methyl propionate, ethyl propionate, propyl propionate, γ -butyrolactone, decalactone, valerolactone, mevalonic lactone, caprolactone, methyl formate, or combinations thereof.
The ether compound may be selected from dibutyl ether, tetraglyme, diglyme, 1, 2-dimethoxyethane, 1, 2-diethoxyethane, ethoxymethoxyethane, 2-methyltetrahydrofuran, tetrahydrofuran, or combinations thereof.
The other organic solvent may be selected from the group consisting of dimethylsulfoxide, 1, 2-dioxolane, sulfolane, methyl sulfolane, 1, 3-dimethyl-2-imidazolidinone, N-methyl-2-pyrrolidone, formamide, dimethylformamide, acetonitrile, trimethyl phosphate, triethyl phosphate, trioctyl phosphate, and phosphate esters, or combinations thereof.
In some embodiments of the present application, taking a lithium ion battery as an example, a positive electrode plate, a separator, and a negative electrode plate are sequentially wound or stacked to form an electrode member, and then the electrode member is placed in, for example, an aluminum plastic film for packaging, and an electrolyte is injected into the electrode member for formation and packaging, so as to form the lithium ion battery. And then, performing performance test on the prepared lithium ion battery.
Those skilled in the art will appreciate that the above-described methods of making electrochemical devices (e.g., lithium ion batteries) are merely examples. Other methods commonly used in the art may be employed without departing from the disclosure herein.
Embodiments of the present application also provide an electronic device including the electrochemical device described above. The electronic device of the embodiment of the present application is not particularly limited, and may be any electronic device known in the art. In some embodiments, the electronic device may include, but is not limited to, a notebook computer, a pen-input computer, a mobile computer, an electronic book player, a portable phone, a portable facsimile machine, a portable copier, a portable printer, a headphone, a video recorder, a liquid crystal television, a handheld cleaner, a portable CD player, a mini-disc, a transceiver, an electronic organizer, a calculator, a memory card, a portable recorder, a radio, a backup power source, an electric motor, an automobile, a motorcycle, a power-assisted bicycle, a lighting fixture, a toy, a game machine, a clock, an electric tool, a flashlight, a camera, a large household battery, a lithium ion capacitor, and the like.
The above description is only a preferred embodiment of the application and is illustrative of the principles of the technology employed. It will be appreciated by those skilled in the art that the scope of the disclosure herein is not limited to the particular combination of features described above, but also encompasses other combinations of features described above or equivalents thereof. For example, the above features and the technical features having similar functions disclosed in the present application are mutually replaced to form the technical solution.

Claims (14)

1. An electrochemical device comprising an electrode assembly comprising a first pole piece, a second pole piece, and a separator disposed between the first pole piece and the second pole piece,
wherein the electrode assembly is a winding structure, the separator includes n segments in sequence in a winding direction, n is an integer greater than 1,
the thickness of the (n-1) th section is greater than the thickness of the (n) th section,
the (n-1) th segment is closer to the first end of the separation film, the (n) th segment is further from the first end of the separation film, and the first end of the separation film is located at the inside of the electrode assembly.
2. The electrochemical device according to claim 1, wherein the separation film comprises a porous substrate and a material layer disposed on the porous substrate,
wherein a thickness of the material layer on the n-1 th section is greater than a thickness of the material layer on the n-th section.
3. The electrochemical device of claim 2, wherein the porous substrate comprises a first side and a second side, the layer of material being disposed on at least one of the first side or the second side.
4. The electrochemical device of claim 3, wherein the material layer is disposed on the first side, the material layer of the n-1 th segment having a thickness greater than a thickness of the material layer of the n-th segment.
5. The electrochemical device of claim 2, wherein the material layer comprises inorganic particles comprising at least one of alumina, silica, magnesia, titania, zirconia, barium oxide, magnesium hydroxide, or boehmite, and a binder.
6. The electrochemical device according to claim 1, wherein the boundary between the n-1 th segment and the n-th segment is located at a bent segment of the separation film.
7. The electrochemical device of claim 2, wherein the material layer of the n-1 th segment and the material layer of the n-th segment are not in contact.
8. The electrochemical device of claim 1, wherein the first pole piece comprises a first current collector and a first active material layer disposed on the first current collector, the second pole piece comprises a second current collector and a second active material layer disposed on the second current collector,
in the winding direction, at least one of the first active material layer or the second active material layer includes m segments in order, m is an integer greater than 1, the m-1 segment is closer to the first end of the separator, and the m segment is further from the first end of the separator.
9. The electrochemical device of claim 8, wherein the density of the m-1 th segment is less than the density of the m-th segment.
10. The electrochemical device of claim 8, wherein the thickness of the m-1 th segment is less than or equal to the thickness of the m-th segment.
11. The electrochemical device according to claim 8, wherein a boundary of the m-1 th segment and the m-th segment is located at a bent segment of the first active material layer or the second active material layer.
12. The electrochemical device according to claim 8, wherein n segments of the separation film are matched in one-to-one correspondence with m segments of the first active material layer or the second active material layer, where n is equal to m.
13. The electrochemical device according to claim 8, wherein n segments of the separator are matched in one-to-one correspondence with m segments of the first active material layer and the second active material layer, and a sum of thicknesses of the respective corresponding segments of the separator, the first active material layer, and the second active material layer is the same, wherein n is equal to m.
14. An electronic device comprising the electrochemical device according to any one of claims 1 to 13.
CN202011407357.3A 2020-12-04 2020-12-04 Electrochemical device and electronic device Pending CN112542616A (en)

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