CN112670597A - Electrode assembly, electrochemical device and electronic equipment - Google Patents
Electrode assembly, electrochemical device and electronic equipment Download PDFInfo
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- CN112670597A CN112670597A CN202011517425.1A CN202011517425A CN112670597A CN 112670597 A CN112670597 A CN 112670597A CN 202011517425 A CN202011517425 A CN 202011517425A CN 112670597 A CN112670597 A CN 112670597A
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- 238000003475 lamination Methods 0.000 claims description 47
- 238000004804 winding Methods 0.000 claims description 39
- 238000004146 energy storage Methods 0.000 claims description 8
- 229910052782 aluminium Inorganic materials 0.000 abstract description 20
- 239000011888 foil Substances 0.000 abstract description 18
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 abstract description 12
- 239000011889 copper foil Substances 0.000 abstract description 11
- 229910052802 copper Inorganic materials 0.000 abstract description 6
- 239000010949 copper Substances 0.000 abstract description 6
- 239000010410 layer Substances 0.000 description 94
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical class [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 17
- 229910001416 lithium ion Inorganic materials 0.000 description 16
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 12
- 239000000463 material Substances 0.000 description 8
- -1 Polyethylene Polymers 0.000 description 6
- 238000010030 laminating Methods 0.000 description 6
- 229910003002 lithium salt Inorganic materials 0.000 description 4
- 159000000002 lithium salts Chemical class 0.000 description 4
- 239000004743 Polypropylene Substances 0.000 description 3
- 229920001155 polypropylene Polymers 0.000 description 3
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- 239000011149 active material Substances 0.000 description 2
- 239000003125 aqueous solvent Substances 0.000 description 2
- 239000011247 coating layer Substances 0.000 description 2
- 239000003792 electrolyte Substances 0.000 description 2
- 229910052744 lithium Inorganic materials 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 239000002356 single layer Substances 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910000552 LiCF3SO3 Inorganic materials 0.000 description 1
- 229910013406 LiN(SO2CF3)2 Inorganic materials 0.000 description 1
- 229910001290 LiPF6 Inorganic materials 0.000 description 1
- 229910012265 LiPO2F2 Inorganic materials 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- MCMNRKCIXSYSNV-UHFFFAOYSA-N ZrO2 Inorganic materials O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- RTZKZFJDLAIYFH-UHFFFAOYSA-N ether Substances CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 229910021385 hard carbon Inorganic materials 0.000 description 1
- 229910001540 lithium hexafluoroarsenate(V) Inorganic materials 0.000 description 1
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 1
- MHCFAGZWMAWTNR-UHFFFAOYSA-M lithium perchlorate Chemical compound [Li+].[O-]Cl(=O)(=O)=O MHCFAGZWMAWTNR-UHFFFAOYSA-M 0.000 description 1
- 229910001486 lithium perchlorate Inorganic materials 0.000 description 1
- 229910001496 lithium tetrafluoroborate Inorganic materials 0.000 description 1
- QSZMZKBZAYQGRS-UHFFFAOYSA-N lithium;bis(trifluoromethylsulfonyl)azanide Chemical compound [Li+].FC(F)(F)S(=O)(=O)[N-]S(=O)(=O)C(F)(F)F QSZMZKBZAYQGRS-UHFFFAOYSA-N 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 description 1
- 239000002985 plastic film Substances 0.000 description 1
- 229920006255 plastic film Polymers 0.000 description 1
- 229910021426 porous silicon Inorganic materials 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
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- 238000006467 substitution reaction Methods 0.000 description 1
- 239000004408 titanium dioxide Substances 0.000 description 1
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Images
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
-
- 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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- Secondary Cells (AREA)
- Connection Of Batteries Or Terminals (AREA)
Abstract
The electrode assembly of the present invention comprises at least one first positive electrode tab and at least one first negative electrode tab; the first positive electrode sheet and the first negative electrode sheet each include a laminated portion provided with an active layer and a wound portion not provided with an active layer; the first positive electrode sheet and the first negative electrode sheet are stacked such that a positive electrode stacked portion and a negative electrode stacked portion correspond, wherein the positive electrode stacked portion and the negative electrode stacked portion form a stacked body, and at least one surface of the stacked body perpendicular to a stacking direction is provided with the positive electrode wound portion and the negative electrode wound portion. When the electrochemical device formed by the electrode assembly is extruded by foreign matters, a 'copper foil-aluminum foil' short circuit is generated preferentially instead of a 'negative electrode-copper foil' short circuit, so that the safety performance of the electrochemical device is improved.
Description
Technical Field
The present invention relates to the field of battery technologies, and in particular, to an electrode assembly, an electrochemical device, and an electronic apparatus.
Background
The laminated lithium ion battery has the advantage of low internal resistance, can support the charge and discharge with large multiplying power, and can meet the requirement of the lithium ion battery for faster and faster charging speed. The lamination stack is widely used in lithium ion batteries.
However, when the lithium ion battery with the current lamination structure is extruded by foreign matters, short circuit can occur inside the lithium ion battery, a large amount of heat is generated, and then safety accidents caused by thermal runaway occur. Short circuit conditions for lithium ion batteries typically include: "positive electrode-copper foil" short circuit, "positive electrode-negative electrode" short circuit, "negative electrode-aluminum foil" short circuit, "copper foil-aluminum foil" short circuit. When a 'cathode-aluminum foil' short circuit mode occurs, because the short circuit resistance between the cathode and the aluminum foil is low, the heat conductivity of the cathode active layer material is poor, and the heat transfer efficiency is poor, the internal thermal runaway of the lithium ion battery is easily caused when the short circuit mode occurs, and safety accidents are caused.
Disclosure of Invention
Embodiments of the present invention provide an electrode assembly capable of improving safety of an electrochemical device when the electrode assembly is used in the electrochemical device.
Embodiments of the present invention provide an electrochemical device having high safety performance.
Embodiments of the present invention provide an electronic device whose driving source and/or energy storage source have high safety performance.
The present invention provides an electrode assembly comprising at least one first positive electrode tab and at least one first negative electrode tab;
in the first positive plate, a positive current collector comprises a positive lamination part provided with a positive active layer and a positive winding part not provided with the positive active layer;
in the first negative electrode sheet, the negative electrode current collector includes a negative electrode lamination portion provided with a negative electrode active layer and a negative electrode winding portion not provided with the negative electrode active layer;
the first positive electrode sheet and the first negative electrode sheet are stacked such that the positive electrode stacked portion and the negative electrode stacked portion correspond to each other, wherein the positive electrode stacked portion and the negative electrode stacked portion form a stacked body, and at least one surface of the stacked body perpendicular to a stacking direction is provided with the positive electrode wound portion and the negative electrode wound portion.
The electrode assembly as described above, wherein the cathode wound portion is distant from the cathode laminated portion with respect to the anode wound portion in the laminating direction.
The electrode assembly as described above, further comprising at least one second positive electrode tab and at least one second negative electrode tab;
the second positive plate comprises a positive current collector and a positive active layer arranged on at least one functional surface of the positive current collector;
the second negative plate comprises a negative current collector and a negative active layer arranged on at least one functional surface of the negative current collector;
the second positive electrode tab and the second negative electrode tab are respectively disposed in an inner region between the positive electrode lamination portion and the negative electrode lamination portion in the lamination direction.
The electrode assembly as described above, further comprising at least one second positive electrode tab and at least one second negative electrode tab;
the second positive plate comprises a positive current collector and a positive active layer arranged on at least one functional surface of the positive current collector;
the second negative plate comprises a negative current collector and a negative active layer arranged on at least one functional surface of the negative current collector;
in the stacking direction, the second positive electrode tab and the second negative electrode tab are respectively disposed in outer regions on both sides of the positive electrode stacking portion and the negative electrode stacking portion, wherein the outer regions are regions between the positive electrode stacking portion or the negative electrode stacking portion and a positive electrode winding portion or a negative electrode winding portion adjacent thereto.
The electrode assembly as described above, wherein a separator is provided between adjacent positive and negative electrode tabs; the positive plate comprises the first positive plate and the second positive plate, and the negative plate comprises the first negative plate and the second negative plate.
The electrode assembly as described above, wherein the separator between the first positive electrode sheet and the first negative electrode sheet includes a separator laminated portion corresponding to the positive electrode laminated portion and the negative electrode laminated portion, respectively, and a separator wound portion corresponding to the positive electrode wound portion and the negative electrode wound portion, respectively.
The electrode assembly as described above, wherein the positive electrode wound portion and the negative electrode wound portion in the stacking direction are planar.
The electrode assembly as described above, wherein the cathode wound portion and the anode wound portion are planar in a direction perpendicular to the stacking direction.
The electrode assembly as described above, wherein an insulating layer is provided between a side end face of the stacked body and the positive electrode wound portion and/or the negative electrode wound portion near the side end face.
The present invention also provides an electrochemical device, wherein the electrochemical device comprises the electrode assembly as described above.
The present invention also provides an electronic apparatus, wherein the driving source and/or the energy storage source of the electronic apparatus is the electrochemical device as described above.
The electrode assembly of the present invention comprises at least one first positive electrode tab and at least one first negative electrode tab; in the first positive plate, the positive current collector comprises a positive lamination part provided with a positive active layer and a positive winding part not provided with the positive active layer; in the first negative electrode sheet, the negative electrode current collector includes a negative electrode lamination portion provided with a negative electrode active layer and a negative electrode winding portion not provided with the negative electrode active layer; the first positive electrode sheet and the first negative electrode sheet are stacked such that the positive electrode stacked portion and the negative electrode stacked portion correspond to each other, wherein the positive electrode stacked portion and the negative electrode stacked portion form a stacked body, and at least one surface of the stacked body perpendicular to a stacking direction is provided with the positive electrode wound portion and the negative electrode wound portion. According to the electrode assembly, the copper foil and the aluminum foil are wrapped on the outermost layer, so that a 'copper foil-aluminum foil' short circuit rather than a 'negative electrode-copper foil' short circuit is generated preferentially when an electrochemical device formed by the electrode assembly is extruded by foreign matters, and the 'copper foil-aluminum foil' short circuit has low short circuit resistance and good thermal conductivity of the copper foil and the aluminum foil, so that severe temperature rise in the battery can not be caused, and therefore, when the upper surface and the lower surface of the lithium ion battery are extruded by the foreign matters, the safety performance is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the related art, the drawings used in the description of the embodiments of the present invention or the related art are briefly introduced below. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
Fig. 1 is a schematic cross-sectional view of an electrode assembly according to a first embodiment of the present invention, taken perpendicular to the direction of tabs;
fig. 2 is a schematic cross-sectional view of an electrode assembly according to a second embodiment of the present invention, taken perpendicular to the direction of tabs;
FIG. 3 is a schematic view of a first positive electrode tab in an electrode assembly in some embodiments of the present invention;
fig. 4 is a schematic view of a first negative electrode tab in an electrode assembly according to some embodiments of the present invention;
fig. 5 is a schematic sectional view of an electrode assembly according to a third embodiment of the present invention, taken perpendicular to the direction of tabs;
fig. 6 is a schematic cross-sectional view of an electrode assembly according to a fourth embodiment of the present invention, taken perpendicular to the direction of tabs;
FIG. 7 is a schematic view of a second positive electrode tab in an electrode assembly according to some embodiments of the present invention;
fig. 8 is a schematic view of a second negative electrode tab in the electrode assembly according to some embodiments of the present invention;
fig. 9 is a schematic cross-sectional view of an electrode assembly according to a fifth embodiment of the present invention, taken perpendicular to the direction of tabs;
fig. 10 is a schematic cross-sectional view of an electrode assembly according to a sixth embodiment of the present invention, taken perpendicular to the direction of tabs;
fig. 11 is a schematic cross-sectional view of an electrode assembly according to a seventh embodiment of the present invention, taken perpendicular to the tab direction;
fig. 12 is a schematic cross-sectional view of an electrode assembly according to an eighth embodiment of the present invention, taken perpendicular to the tab direction;
fig. 13 is a schematic cross-sectional view of an electrode assembly according to a ninth embodiment of the present invention, taken perpendicular to the tab direction;
FIG. 14 is a schematic cross-sectional view of the electrode assembly of FIG. 13 taken parallel to the tab direction at the positive tab in accordance with the present invention;
fig. 15 is a schematic cross-sectional view of the electrode assembly of fig. 13 at the negative electrode tab in a direction parallel to the tab direction in accordance with the present invention.
Description of reference numerals:
100: a first positive plate;
200: a first negative plate;
300: a second positive plate;
400: a second negative plate;
500: a diaphragm;
600: the external connection of the positive tab is realized;
700: the negative electrode lug is externally connected;
101: a positive current collector;
102: a positive electrode active layer;
201: a negative current collector;
202: and a negative electrode active layer.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 is a schematic cross-sectional view of an electrode assembly according to a first embodiment of the present invention, taken perpendicular to the direction of tabs; fig. 2 is a schematic cross-sectional view of an electrode assembly according to a second embodiment of the present invention, taken perpendicular to the direction of tabs; FIG. 3 is a schematic view of a first positive electrode tab in an electrode assembly in some embodiments of the present invention; fig. 4 is a schematic view of a first negative electrode tab in an electrode assembly according to some embodiments of the present invention. As shown in fig. 1 to 4, a first aspect of the present invention provides an electrode assembly including at least one first positive electrode tab 100 and at least one first negative electrode tab 200;
in the first positive electrode sheet 100, the positive electrode collector 101 includes a positive electrode laminated portion where the positive electrode active layer 102 is provided and a positive electrode wound portion where the positive electrode active layer 102 is not provided;
in the first negative electrode sheet 200, the negative electrode collector 201 includes a negative electrode laminated portion where the negative electrode active layer 202 is disposed and a negative electrode wound portion where the negative electrode active layer 202 is not disposed;
the first positive electrode sheet 100 and the first negative electrode sheet 200 are stacked such that a positive electrode stacked portion and a negative electrode stacked portion, which form a stacked body, correspond, and at least one surface of the stacked body perpendicular to the stacking direction is provided with a positive electrode wound portion and a negative electrode wound portion.
As shown in fig. 3, the first positive electrode sheet 100 is composed of a positive electrode lamination portion and a positive electrode winding portion which are adjacent to each other, and the positive electrode lamination portion and the positive electrode winding portion are not spaced apart from each other. The positive electrode lamination portion of the first positive electrode sheet 100 may be a portion in which the positive electrode active layer 102 is provided on one surface of the positive electrode collector 101, or may be a portion in which the positive electrode active layer 102 is provided on both surfaces of the positive electrode collector 101; the above-described positive wound portion where the positive active layer 102 is not provided is a blank positive current collector 101. As shown in fig. 4, the first negative electrode sheet 200 is composed of a negative electrode lamination portion and a negative electrode winding portion which are adjacent to each other, and are not spaced apart from each other. The negative electrode laminated portion of the first negative electrode sheet 200 may be a portion in which the negative electrode active layer 202 is provided on one surface of the negative electrode collector 201, or may be a portion in which the negative electrode active layer 202 is provided on both surfaces of the negative electrode collector 201; the above-described negative wound portion where the negative active layer 202 is not provided is a blank negative current collector 201.
The first positive electrode sheet 100 and the first negative electrode sheet 200 are stacked such that the positive electrode stacked portion and the negative electrode stacked portion correspond to each other, that is, the portion of the first positive electrode sheet 100 on which the positive electrode active layer 102 is disposed and the portion of the first negative electrode sheet 200 on which the negative electrode active layer 202 is disposed correspond to each other and are arranged in parallel, and the projected area of the positive electrode active layer 102 on the negative electrode active layer 202 completely corresponds to the area of the negative electrode active layer 202 or the projected area of the negative electrode active layer 202 on the positive electrode active layer 102 completely corresponds to the area of the positive electrode active layer 102.
After the first positive electrode sheet 100 and the first negative electrode sheet 200 are stacked, the positive electrode stacking portion and the negative electrode stacking portion form a stacking body, and the stacking direction is the direction in which the positive electrode stacking portion and the negative electrode stacking portion are stacked. The surfaces of the stacked body perpendicular to the stacking direction, that is, the positive electrode stacked portion and the negative electrode stacked portion are parallel to the upper and lower surfaces of the positive electrode active layer 102 and the negative electrode active layer 202. The positive electrode wound portion and the negative electrode wound portion may be provided on at least one surface of the stacked body perpendicular to the stacking direction, and the positive electrode wound portion and the negative electrode wound portion may be provided on one surface of the stacked body, or the positive electrode wound portion and the negative electrode wound portion may be provided on both the upper surface and the lower surface of the stacked body.
The material of the positive electrode collector 101 may be set according to actual needs. In the present invention, the positive electrode collector 101 may include an aluminum foil. The type and proportion of the active material in the positive electrode active layer 102 may be set according to actual needs, and may generally include materials such as lithium cobaltate, lithium iron phosphate, and lithium-rich manganese, which are not further limited herein.
The material of the negative electrode collector 201 may be set according to actual needs. In the present invention, the negative electrode collector 201 may include a copper foil. The kind and ratio of the active material in the negative electrode active layer 202 may be set according to actual needs, and may generally include materials such as graphite, hard carbon, silicon, and silicon oxide, which are not further limited herein.
The positive electrode active layer 102 part on the positive electrode sheet and the negative electrode active layer 202 part on the negative electrode sheet are correspondingly arranged in parallel, the positive electrode laminated part and the negative electrode laminated part form a laminated body, and at least one surface of the laminated body, which is perpendicular to the laminating direction, is provided with a positive electrode winding part and a negative electrode winding part. With this arrangement, when the upper and lower surfaces of the lithium ion battery including the electrode assembly are pressed by foreign matters, a short circuit between the positive current collector 101 and the negative current collector 201, that is, a short circuit between the copper foil of the positive current collector 101 and the aluminum foil of the negative current collector 201, occurs first, and when a short circuit occurs between the copper foil and the aluminum foil, the short circuit resistance is low, and the thermal conductivity of the copper foil and the aluminum foil is good, so that a severe temperature rise inside the battery is not caused, and therefore, when the upper and lower surfaces of the lithium ion battery are pressed by foreign matters, the safety performance is improved.
In some embodiments of the present invention, as shown in fig. 1 or fig. 2, the cathode wound portion is distant from the cathode laminated portion with respect to the anode wound portion in the laminating direction. That is, in any case, the outermost side of the electrode assembly formed after wrapping is the positive electrode current collector 101.
When the outermost side of the formed electrode assembly is the positive electrode current collector 101 aluminum foil, the aluminum foil is coated when the electrode assembly is externally packaged, so that an oxide layer is formed on the surface of the coated aluminum foil, corrosion between the formed oxide layer and the external package is not easy to occur, and the service life of the battery is prolonged.
Fig. 5 is a schematic sectional view of an electrode assembly according to a third embodiment of the present invention, taken perpendicular to the direction of tabs; fig. 6 is a schematic cross-sectional view of an electrode assembly according to a fourth embodiment of the present invention, taken perpendicular to the direction of tabs; FIG. 7 is a schematic view of a second positive electrode tab in an electrode assembly according to some embodiments of the present invention; fig. 8 is a schematic view of a second negative electrode tab in an electrode assembly according to some embodiments of the present invention. In some embodiments of the present invention, as shown in fig. 5 to 8, the electrode assembly further includes at least one second positive electrode tab 300 and at least one second negative electrode tab 400;
the second positive electrode tab 300 includes a positive electrode collector 101 and a positive electrode active layer 102 disposed on at least one functional surface of the positive electrode collector 101;
the second negative electrode tab 400 includes a negative electrode collector 201 and a negative electrode active layer 202 disposed on at least one functional surface of the negative electrode collector 201;
the second positive electrode tab 300 and the second negative electrode tab 400 are respectively disposed in the inner region between the positive electrode lamination portion and the negative electrode lamination portion in the lamination direction.
The functional surface is a surface provided with an active coating, and as can be seen from fig. 7, the second positive electrode sheet 300 is a positive electrode sheet commonly used in the art, and may be a positive electrode sheet in which the positive electrode active layer 102 is completely provided on one surface of the positive electrode current collector 101, or may be a positive electrode sheet in which the positive electrode active layer 102 is completely provided on both surfaces of the positive electrode current collector 101; as can be seen from fig. 8, the second negative electrode tab 400 is a negative electrode tab commonly used in the art, and may be a negative electrode tab in which the negative electrode active layer 202 is completely disposed on one surface of the negative electrode collector 201, or may be a negative electrode tab in which the negative electrode active layer 202 is completely disposed on both surfaces of the negative electrode collector 201. The internal region is an intermediate region between the laminated portion of the first positive electrode sheet 100 and the laminated portion of the first negative electrode sheet 200, that is, the second positive electrode sheet 300 and the second negative electrode sheet 400 are disposed in parallel between the laminated portion of the first positive electrode sheet 100 and the laminated portion of the first negative electrode sheet 200, the positive electrode active layer 102 of the second positive electrode sheet 300, the negative electrode active layer 202 of the second negative electrode sheet 400, the positive electrode active layer 102 of the first positive electrode sheet 100, and the negative electrode active layer 202 of the first negative electrode sheet 200 are disposed in parallel, and a projected area of the positive electrode active layer 102 on the negative electrode active layer 202 completely corresponds to an area of the negative electrode active layer 202 or a projected area of the negative electrode active layer 202 on the positive electrode active layer 102 completely corresponds to an area of the positive electrode active layer 102.
The second positive plate 300 and the second negative plate 400, the first positive plate 100 and the first negative plate 200, which are common in the art, are arranged in parallel relative to the negative active layer 202 according to the positive active layer 102, and the winding parts of the first positive plate 100 and the first negative plate 200 wrap the pole piece laminating parts arranged in parallel, so that the requirements of multiple pole pieces of the lithium ion battery can be met, and the problems that when the positive winding parts of multiple first positive plates 100 and the negative winding parts of multiple first negative plates 200 wrap the pole piece laminating parts in a winding manner, the multiple blank winding parts are wound to cause material waste and the energy density of the battery is reduced are solved.
Fig. 9 is a schematic cross-sectional view of an electrode assembly according to a fifth embodiment of the present invention, taken perpendicular to the direction of tabs; fig. 10 is a schematic cross-sectional view of an electrode assembly according to a sixth embodiment of the present invention, taken perpendicular to the direction of tabs; fig. 11 is a schematic cross-sectional view of an electrode assembly according to a seventh embodiment of the present invention, taken perpendicular to the tab direction; fig. 12 is a schematic cross-sectional view of an electrode assembly according to an eighth embodiment of the present invention, taken perpendicular to the tab direction. In some embodiments of the present invention, as shown in fig. 9 to 12, the electrode assembly further includes at least one second positive electrode tab 300 and at least one second negative electrode tab 400;
the second positive electrode tab 300 includes a positive electrode collector 101 and a positive electrode active layer 102 disposed on at least one functional surface of the positive electrode collector 101;
the second negative electrode tab 400 includes a negative electrode collector 201 and a negative electrode active layer 202 disposed on at least one functional surface of the negative electrode collector 201;
the second positive electrode tab 300 and the second negative electrode tab 400 are respectively disposed at both side outer regions of the positive electrode lamination portion and the negative electrode lamination portion in the lamination direction, wherein the outer regions are regions between the positive electrode lamination portion or the negative electrode lamination portion and the positive electrode winding portion or the negative electrode winding portion adjacent thereto.
The second positive electrode tab 300 and the second negative electrode tab 400 are disposed at both side outer regions of the positive electrode lamination portion and the negative electrode lamination portion, respectively, that is, the second positive electrode tab 300 is disposed at an outer region of the lamination portion after the first negative electrode tab 200 and the first positive electrode tab 100 are laminated, and the second negative electrode tab 400 is disposed at an outer region of the lamination portion after the first negative electrode tab 200 and the first positive electrode tab 100 are laminated. And the positive electrode active layer 102 of the second positive electrode tab 300, the negative electrode active layer 202 of the second negative electrode tab 400, the positive electrode active layer 102 of the first positive electrode tab 100, and the negative electrode active layer 202 of the first negative electrode tab 200 are arranged in parallel, and the projected area of the positive electrode active layer 102 on the negative electrode active layer 202 completely corresponds to the area of the negative electrode active layer 202 or the projected area of the negative electrode active layer 202 on the positive electrode active layer 102 completely corresponds to the area of the positive electrode active layer 102.
The outer region may include a region between the cathode laminated portion and the adjacent cathode wound portion, a region between the cathode laminated portion and the adjacent anode wound portion, a region between the anode laminated portion and the adjacent cathode wound portion, and a region between the anode laminated portion and the adjacent anode wound portion.
It is understood that, in the present embodiment, a laminated portion after the positive electrode laminated portion of the first positive electrode sheet 100 and the negative electrode laminated portion of the first negative electrode sheet 200 are laminated is used as a boundary, and the laminated portion is a first region above and a second region below the laminated portion.
When the electrode assembly includes one second positive electrode tab 300 and one second negative electrode tab 400, the second positive electrode tab 300 may be disposed in the first region, the second negative electrode tab 400 may be disposed in the second region, or the second negative electrode tab 400 may be disposed in the first region, and the second positive electrode tab 300 may be disposed in the second region, in the stacking direction; it is also possible to simultaneously dispose the second positive electrode tab 300 and the second negative electrode tab 400 in the first region, or to simultaneously dispose the second positive electrode tab 300 and the second negative electrode tab 400 in the second region.
The electrode assembly includes N second positive electrode tabs 300, and M second negative electrode tabs 400, where N is 2 or more and M is 2 or more. The second positive electrode tab 300 and the second negative electrode tab 400 may be simultaneously disposed in the first region, or the second positive electrode tab 300 and the second negative electrode tab 400 may be simultaneously disposed in the second region; the second positive electrode tab 300 and the second negative electrode tab 400 may be disposed in both the first region and the second region.
Fig. 13 is a schematic cross-sectional view of an electrode assembly according to a ninth embodiment of the present invention, taken perpendicular to the tab direction. As shown in fig. 13, in some embodiments of the present invention, the number of the first positive electrode tabs 100 is one, the number of the first negative electrode tabs 200 is one, the number of the second positive electrode tabs 300 is N, N is 2 or more, the number of the second negative electrode tabs 400 is M, and M is 2 or more.
A first positive plate 100, a first negative plate 200, N second positive plates 300 and M second negative plates 400 are arranged, wherein N is more than or equal to 2, and M is more than or equal to 2. The positive electrode active layers 102 of the N second positive electrode sheets 300, the negative electrode active layers 202 of the M second negative electrode sheets 400, the positive electrode lamination portion and the negative electrode lamination portion are arranged in parallel according to the positive electrode active layers 102 corresponding to the negative electrode active layers 202, the positive electrode winding portion and the negative electrode winding portion are wound around the lamination portion in the counterclockwise direction or the clockwise direction to wrap the lamination portion until the number of layers of the wrapping meets the actual requirement, and the winding can be finished.
The number of the first positive electrode sheets 100 and the first negative electrode sheets 200 is limited to one, so that the outermost layers of the upper and lower surfaces of the electrode assembly are the blank positive current collector 101 and the blank negative current collector 201, when the upper and lower surfaces of the lithium ion battery containing the electrode assembly are extruded by foreign matters, short circuit between the positive current collector 101 and the negative current collector 201 will occur first, and the safety performance of the lithium ion battery is improved. Moreover, only one first positive plate 100 and one first negative plate 200 are provided, so that the number of winding parts during wrapping is reduced, and the energy density of the lithium ion battery is improved.
In some embodiments of the present invention, a separator 500 is provided between adjacent positive and negative electrode sheets; the positive electrode tab includes a first positive electrode tab 100 and a second positive electrode tab 300, and the negative electrode tab includes a first negative electrode tab 200 and a second negative electrode tab 400.
Specifically, the separator 500 is provided between the first positive electrode tab 100 and the first negative electrode tab 200, the separator 500 is provided between the first positive electrode tab 100 and the second negative electrode tab 400, the separator 500 is provided between the second positive electrode tab 300 and the second negative electrode tab 400, and the separator 500 is provided between the second positive electrode tab 300 and the first negative electrode tab 200.
The separator 500 may include a substrate and a coating layer, wherein the substrate may be a Polyethylene (PE) monolayer film, a polypropylene (PP) monolayer film, or a polypropylene-polyethylene-polypropylene three-layer composite film, and the coating layer may be at least one of porous silicon dioxide, aluminum oxide, titanium dioxide, and zirconium dioxide.
According to the invention, the diaphragm 500 is arranged between the adjacent positive plate and the negative plate, so that the positive active layer 102 is prevented from contacting with the negative active layer 202, the positive active layer 102 is prevented from contacting with the negative current collector 201, the negative active layer 202 is prevented from contacting with the positive current collector 101, and the positive current collector 101 is prevented from contacting with the negative current collector 201, so that the safety performance of the battery is improved.
In some embodiments of the present invention, the separator 500 between the first positive electrode sheet 100 and the first negative electrode sheet 200 includes a separator lamination part corresponding to the positive electrode lamination part and the negative electrode lamination part, respectively, and a separator winding part corresponding to the positive electrode winding part and the negative electrode winding part, respectively.
Specifically, a separator laminated portion and a separator wound portion are disposed adjacently, the separator laminated portion is disposed in parallel between the cathode active layer 102 and the anode active layer 202, the separator wound portion is disposed between the cathode wound portion and the anode wound portion, the cathode wound portion and the anode active layer 202, the anode wound portion and the cathode active layer 102. Through the arrangement, the positive electrode active layer 102 is prevented from contacting the negative electrode active layer 202, the positive electrode active layer 102 is prevented from contacting the negative electrode current collector 201, the negative electrode active layer 202 is prevented from contacting the positive electrode current collector 101, and the positive electrode current collector 101 is prevented from contacting the negative electrode current collector 201, so that the safety performance of the battery is improved.
In some embodiments of the present invention, the positive electrode wound portion and the negative electrode wound portion in the stacking direction are flat. That is, the positive and negative electrode wound portions are perpendicular to the upper and lower surfaces of the stacked portion, by which not only the material of the wound portion can be reduced, but also the space can be saved, the volume of the electrode assembly can be reduced, and the energy density of the battery can be improved.
In some embodiments of the present invention, the cathode wound portion and the anode wound portion are planar in a direction perpendicular to the stacking direction. That is, the winding part is parallel to the upper and lower surfaces of the stacking part, and thus, not only can the material of the winding part be reduced, but also the space can be saved, the volume of the electrode assembly can be reduced, and the energy density of the battery can be improved.
In some embodiments of the present invention, an insulating layer is provided between the side end face of the stacked body and the positive electrode wound portion and/or the negative electrode wound portion near the side end face.
In the present invention, the side end surfaces of the laminated body mean two surfaces parallel to the positive electrode wound portion and the negative electrode wound portion in the laminating direction. When the cathode wound portion and the anode wound portion are wound along the stacked body, there may be cases where the cathode wound portion comes into contact with the side end face of the stacked body, the anode wound portion comes into contact with the side end face of the stacked body, and both the cathode wound portion and the anode wound portion come into contact with the side end face of the stacked body, which are all liable to cause a short circuit. According to the invention, the insulating layer is arranged between the laminated main body and the anode winding part and/or the cathode winding part close to the laminated main body, so that short circuit between the anode winding part and/or the cathode winding part and the laminated main body can be avoided, and the safety performance of the lithium ion battery is improved.
Fig. 14 is a schematic cross-sectional view of the electrode assembly of fig. 13 of the present invention at the positive tab in a direction parallel to the tab direction. As shown in fig. 14, the current collector tabs die-cut from the first positive electrode sheet 100 and the plurality of second positive electrode sheets 300 are simultaneously welded to an external positive electrode tab 600, so as to ensure that the lithium ion battery is communicated with an external circuit. The external positive tab 600 may be made of aluminum tape.
Fig. 15 is a schematic cross-sectional view of the electrode assembly of fig. 13 at the negative electrode tab in a direction parallel to the tab direction in accordance with the present invention. As shown in fig. 15, the current collector tabs die-cut from the first negative electrode sheet 200 and the second negative electrode sheets 400 are welded to an external negative electrode tab 700 at the same time, so as to ensure that the lithium ion battery is connected to an external circuit. The external negative electrode tab 700 may be made of nickel tape.
A second aspect of the present invention provides an electrochemical device comprising the electrode assembly described above, further comprising an exterior package and an electrolyte.
The outer package may be an aluminum plastic film, and the electrolyte may include a lithium salt and a non-aqueous solvent. In the present invention, the lithium salt is not particularly limited, and any lithium salt known in the art may be used as long as the object of the present invention can be achieved. For example, the lithium salt may include LiPF6、LiBF4、LiAsF6、LiClO4、LiB(C6H5)4、LiCH3SO3、LiCF3SO3、LiN(SO2CF3)2、LiC(SO2CF3)3Or LiPO2F2At least one of (1). In the present invention, the nonaqueous solvent is not particularly limited as long as the object of the present invention can be achieved. For example, the non-aqueous solvent may include at least one of a carbonate compound, a carboxylate compound, an ether compound, a nitrile compound, and other organic solvents.
When the electrochemical device is extruded by foreign matters, a 'copper foil-aluminum foil' short circuit is generated preferentially instead of a 'negative electrode-copper foil' short circuit, so that the safety performance of the electrochemical device is improved.
A third aspect of the present invention provides an electronic apparatus, wherein the drive source and/or the energy storage source of the electronic apparatus is the electrochemical device described above.
The electrochemical device may be used as a power source for electronic equipment, and may also be used as an energy storage unit for the electronic equipment. The electronic devices may include, but are not limited to, mobile devices (e.g., mobile phones, notebook computers, etc.), electric vehicles (e.g., electric vehicles, hybrid electric vehicles, plug-in hybrid electric vehicles, electric bicycles, electric scooters, electric golf carts, electric trucks, etc.), electric trains, ships and satellites, energy storage systems, and the like.
The driving source and/or the energy storage source of the electronic equipment are/is the electrochemical device, and when the driving source and/or the energy storage source is extruded by foreign matters, a copper foil-aluminum foil short circuit is preferentially generated instead of a negative electrode-copper foil short circuit, so that the safety performance of the electronic equipment is improved.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. An electrode assembly comprising at least one first positive electrode tab and at least one first negative electrode tab;
in the first positive plate, a positive current collector comprises a positive lamination part provided with a positive active layer and a positive winding part not provided with the positive active layer;
in the first negative electrode sheet, the negative electrode current collector includes a negative electrode lamination portion provided with a negative electrode active layer and a negative electrode winding portion not provided with the negative electrode active layer;
the first positive electrode sheet and the first negative electrode sheet are stacked such that the positive electrode stacked portion and the negative electrode stacked portion correspond to each other, wherein the positive electrode stacked portion and the negative electrode stacked portion form a stacked body, and at least one surface of the stacked body perpendicular to a stacking direction is provided with the positive electrode wound portion and the negative electrode wound portion.
2. The electrode assembly according to claim 1, wherein the cathode wound portion is distant from the cathode laminated portion with respect to the anode wound portion in the lamination direction.
3. The electrode assembly according to claim 2, further comprising at least one second positive electrode tab and at least one second negative electrode tab;
the second positive plate comprises a positive current collector and a positive active layer arranged on at least one functional surface of the positive current collector;
the second negative plate comprises a negative current collector and a negative active layer arranged on at least one functional surface of the negative current collector;
the second positive electrode tab and the second negative electrode tab are respectively disposed in an inner region between the positive electrode lamination portion and the negative electrode lamination portion in the lamination direction.
4. The electrode assembly according to claim 2 or 3, further comprising at least one second positive electrode tab and at least one second negative electrode tab;
the second positive plate comprises a positive current collector and a positive active layer arranged on at least one functional surface of the positive current collector;
the second negative plate comprises a negative current collector and a negative active layer arranged on at least one functional surface of the negative current collector;
the second positive electrode tab and the second negative electrode tab are respectively disposed in outer regions on both sides of the positive electrode lamination portion and the negative electrode lamination portion in the lamination direction, wherein the outer regions are regions between the positive electrode lamination portion or the negative electrode lamination portion and a positive electrode winding portion or a negative electrode winding portion adjacent thereto.
5. The electrode assembly according to claim 3 or 4, wherein a separator is provided between adjacent positive and negative electrode tabs; the positive plate comprises the first positive plate and the second positive plate, and the negative plate comprises the first negative plate and the second negative plate.
6. The electrode assembly according to claim 5, wherein the separator between the first positive electrode sheet and the first negative electrode sheet includes a separator lamination portion and a separator winding portion, the separator lamination portions respectively corresponding to the positive electrode lamination portion and the negative electrode lamination portion, and the separator winding portion respectively corresponding to the positive electrode winding portion and the negative electrode winding portion.
7. The electrode assembly according to any one of claims 1 to 6, wherein the positive electrode wound portion and the negative electrode wound portion in the stacking direction are planar; and/or the presence of a gas in the gas,
the positive electrode wound portion and the negative electrode wound portion are planar in a direction perpendicular to the stacking direction.
8. The electrode assembly according to claim 1, wherein an insulating layer is provided between a side end face of the laminated body and the positive electrode wound portion and/or the negative electrode wound portion near the side end face.
9. An electrochemical device comprising an electrode assembly according to any one of claims 1 to 8.
10. An electronic device, wherein the driving source and/or the energy storage source of the electronic device is the electrochemical device according to claim 9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011517425.1A CN112670597A (en) | 2020-12-21 | 2020-12-21 | Electrode assembly, electrochemical device and electronic equipment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011517425.1A CN112670597A (en) | 2020-12-21 | 2020-12-21 | Electrode assembly, electrochemical device and electronic equipment |
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| CN112670597A true CN112670597A (en) | 2021-04-16 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023207301A1 (en) * | 2022-04-29 | 2023-11-02 | 宁德时代新能源科技股份有限公司 | Electrode assembly, battery cell, battery and electric device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2015028860A (en) * | 2013-07-30 | 2015-02-12 | 日立マクセル株式会社 | Laminate type battery |
| WO2015129401A1 (en) * | 2014-02-25 | 2015-09-03 | 株式会社村田製作所 | Power storage device |
| CN106469832A (en) * | 2015-08-19 | 2017-03-01 | 中信国安盟固利动力科技有限公司 | A kind of safeguard construction of lithium ion battery |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2015028860A (en) * | 2013-07-30 | 2015-02-12 | 日立マクセル株式会社 | Laminate type battery |
| WO2015129401A1 (en) * | 2014-02-25 | 2015-09-03 | 株式会社村田製作所 | Power storage device |
| CN106469832A (en) * | 2015-08-19 | 2017-03-01 | 中信国安盟固利动力科技有限公司 | A kind of safeguard construction of lithium ion battery |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2023207301A1 (en) * | 2022-04-29 | 2023-11-02 | 宁德时代新能源科技股份有限公司 | Electrode assembly, battery cell, battery and electric device |
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