CN115498366A - Electrochemical device and electric equipment - Google Patents
Electrochemical device and electric equipment Download PDFInfo
- Publication number
- CN115498366A CN115498366A CN202110680719.4A CN202110680719A CN115498366A CN 115498366 A CN115498366 A CN 115498366A CN 202110680719 A CN202110680719 A CN 202110680719A CN 115498366 A CN115498366 A CN 115498366A
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- electrode assembly
- electrochemical device
- extension
- pole piece
- extension portion
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- 239000012528 membrane Substances 0.000 claims abstract description 16
- 238000000926 separation method Methods 0.000 claims description 18
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 abstract description 10
- 229910001416 lithium ion Inorganic materials 0.000 abstract description 10
- 230000004888 barrier function Effects 0.000 abstract 2
- 230000005518 electrochemistry Effects 0.000 abstract 1
- 238000002955 isolation Methods 0.000 description 32
- 238000004804 winding Methods 0.000 description 13
- 239000002390 adhesive tape Substances 0.000 description 7
- 239000003792 electrolyte Substances 0.000 description 7
- 239000011149 active material Substances 0.000 description 6
- 239000003292 glue Substances 0.000 description 6
- -1 LiCoO 2 Chemical class 0.000 description 5
- 239000000853 adhesive Substances 0.000 description 5
- 230000001070 adhesive effect Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 239000007774 positive electrode material Substances 0.000 description 4
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 3
- 230000008602 contraction Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 229910015643 LiMn 2 O 4 Inorganic materials 0.000 description 2
- 229910013716 LiNi Inorganic materials 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 239000006258 conductive agent Substances 0.000 description 2
- 230000002708 enhancing effect Effects 0.000 description 2
- 239000007773 negative electrode material Substances 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 229920001155 polypropylene Polymers 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 206010063385 Intellectualisation Diseases 0.000 description 1
- 229910012851 LiCoO 2 Inorganic materials 0.000 description 1
- 229910013870 LiPF 6 Inorganic materials 0.000 description 1
- 229910000861 Mg alloy Inorganic materials 0.000 description 1
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 1
- 229910001128 Sn alloy Inorganic materials 0.000 description 1
- 229910001069 Ti alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 239000006183 anode active material Substances 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 239000003575 carbonaceous material Substances 0.000 description 1
- 150000004770 chalcogenides Chemical class 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 239000011889 copper foil Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 238000007306 functionalization reaction Methods 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 229910021450 lithium metal oxide Inorganic materials 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- QPJSUIGXIBEQAC-UHFFFAOYSA-N n-(2,4-dichloro-5-propan-2-yloxyphenyl)acetamide Chemical compound CC(C)OC1=CC(NC(C)=O)=C(Cl)C=C1Cl QPJSUIGXIBEQAC-UHFFFAOYSA-N 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000002985 plastic film Substances 0.000 description 1
- 229920006255 plastic film Polymers 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001256 stainless steel alloy Inorganic materials 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- XOLBLPGZBRYERU-UHFFFAOYSA-N tin dioxide Chemical compound O=[Sn]=O XOLBLPGZBRYERU-UHFFFAOYSA-N 0.000 description 1
- 229910001887 tin oxide Inorganic materials 0.000 description 1
- 229910000314 transition metal oxide Inorganic materials 0.000 description 1
Images
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/46—Separators, membranes or diaphragms characterised by their combination with electrodes
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- 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
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
- H01M50/233—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by physical properties of casings or racks, e.g. dimensions
- H01M50/242—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by physical properties of casings or racks, e.g. dimensions adapted for protecting batteries against vibrations, collision impact or swelling
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/463—Separators, membranes or diaphragms characterised by their shape
-
- 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
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Secondary Cells (AREA)
Abstract
The embodiment of the application relates to the technical field of electrochemistry, and discloses an electrochemical device and electric equipment, including the electrode assembly, the electrode assembly includes first pole piece, barrier film and the second pole piece of piling up along the first direction, and the electrode assembly has first tip and second tip on the second direction, and the second direction perpendicular to first direction, and the barrier film includes first extension, and first extension stretches out outside the electrode assembly from first tip to first extension is connected in the surface of electrode assembly. The first extension portion extends out of the electrode assembly from the first end portion and is connected to the outer surface of the electrode assembly, so that the first pole piece and/or the second pole piece and the isolating membrane main body jointly form the electrode assembly for offsetting acting force applied to the isolating membrane main body when the lithium ion battery falls onto the ground, and the problem of isolating membrane shrinkage generated when the isolating membrane main body is impacted by the outside is solved.
Description
Technical Field
The present disclosure relates to electrochemical technologies, and particularly to an electrochemical device and an electrical apparatus.
Background
Electrochemical devices such as lithium ion batteries are widely used in consumer electronics products such as notebook computers, smart phones, and tablet computers because of their high cycle stability, high safety, and low maintenance. However, as consumer electronic products are developed toward intellectualization, lightness, thinness, portability, multi-functionalization, high performance, and the like, more stringent requirements are also placed on lithium ion batteries for supplying power to consumer electronic products, for example, the lithium ion batteries must have higher energy density and larger capacity.
At present, most consumer electronic products are portable, and are inevitably subjected to a falling condition in the daily use process, and the electrode assembly accommodated in the shell is relatively moved due to external impact applied to the lithium ion battery when the consumer electronic products fall to the ground, so that the problem that the positive and negative pole pieces are directly contacted due to the fact that an isolation film of the electrode assembly is retracted into a gap between the positive and negative pole pieces is caused. In particular, the top and bottom of the electrode assembly are relatively easily broken and deformed, and thus the problem of direct contact of the positive and negative electrode sheets generally occurs at the top or bottom of the electrode assembly.
In the process of implementing the application, the inventor finds that: in order to improve the problem of the shrinkage of the isolating membrane, the top or the bottom of the electrode assembly is usually subjected to glue winding treatment, but because the width of the isolating membrane is greater than the widths of the positive and negative pole pieces, even if the electrode assembly is subjected to glue winding treatment, the binding effect on the part of the isolating membrane extending out of the electrode assembly is still poor, and the isolating membrane still shrinks when falling.
Disclosure of Invention
An embodiment of the present application aims to provide an electrochemical device and an electric device, which aim to solve the problem of separator shrinkage caused by external impact applied to a separator when a lithium ion battery falls on the ground.
In order to solve the above technical problem, one technical solution adopted by the embodiments of the present application is: an electrochemical device is provided that includes an electrode assembly. The electrode assembly includes a first pole piece, a separator, and a second pole piece stacked in a first direction. The electrode assembly has a first end and a second end in a second direction. The second direction is perpendicular to the first direction. The isolation film includes a first extension. The first extension portion extends out of the electrode assembly from the first end portion, and the first extension portion is connected to an outer surface of the electrode assembly. The first extension extends out of the electrode assembly and is connected to the outer surface of the electrode assembly, the first pole piece and/or the second pole piece and the isolation film jointly form the electrode assembly used for offsetting acting force applied to the isolation film by the battery shell when the lithium ion battery falls to the ground, and the problem that the isolation film shrinks when being impacted by the outside is solved.
In a possible embodiment, the first extension surrounds the outer surface of the electrode assembly at least one turn. By the arrangement, the structural integrity of the electrode assembly is improved, and the impact resistance of the electrode assembly is improved.
In a possible embodiment, the electrochemical device further comprises a connection member. The connector is configured to secure the first extension to an outer surface of the electrode assembly. With this arrangement, the first extension is less likely to be detached from the outer surface of the electrode assembly.
In a possible embodiment, the connecting piece is at least one of double-sided gummed paper or single-sided gummed paper. The first extension portion may be conveniently fixed to the outer surface of the electrode assembly using double-sided adhesive tape or single-sided adhesive tape.
In a possible embodiment, the isolating membrane further comprises a second extension. The second extension portion extends from the electrode assembly to the outside of the electrode assembly, and the second extension portion is fixed to the outer surface of the electrode assembly. The second extending part and the first extending part can be respectively fixed on the outer surface of the electrode assembly, so that the structural integrity of the electrode assembly is improved, and the impact resistance of the electrode assembly is favorably improved.
In a possible embodiment, the first extension and the second extension are spaced apart along the first direction. That is, the first extension portion and the second extension portion extend from the same end of the separation film and are fixed to the outer surface of the electrode assembly. Compared with the fixation of the first extending part, the contraction degree of the isolating membrane after the impact is further reduced after the isolating membrane is impacted.
In a possible embodiment, the first and second extensions are spaced apart along the second direction. That is, the first and second extension portions extend from both ends of the separator and are fixed to the outer surface of the electrode assembly. Compared with the fixation of the first extending part, the contraction degree of the isolation film after the impact can be further reduced after the isolation film is impacted.
In a possible embodiment, the first extension part and the second extension part are independently provided at the first end or the second end of the electrode assembly. Namely, the first extending part and the second extending part are arranged at one end of the isolation film at intervals. The thickness of the electrode assembly is reduced while ensuring better impact resistance of the electrode assembly than the fixation of the first extension portion.
In a possible embodiment, the first extension portion and the second extension portion are disposed at a first end portion of the electrode assembly. And the first extending part is bent along the first direction, and the second extending part is bent along the direction opposite to the first direction.
In a possible embodiment, the first extension portion and the second extension portion are each independently disposed adjacent to an outermost turn of the electrode assembly along the first direction.
In a possible embodiment, the electrode assembly further includes a first tab and a second tab. The first tab is connected to a positive electrode of the electrochemical device. And the second electrode lug is connected with the negative electrode of the electrochemical device. The first pole lug and the second pole lug are arranged at intervals along a third direction. Wherein the first extension is between the first tab and the second tab.
In a possible embodiment, the isolation diaphragm further comprises an isolation diaphragm body. The first extending part and the isolation film body are integrally formed. The occurrence of the first extension portion being detached from the joint of the first extension portion and the isolation diaphragm main body is reduced.
Another technical scheme adopted by the embodiment of the application is as follows: there is provided an electrical apparatus comprising a load and an electrochemical device as claimed in any preceding claim, the load being electrically connected to the electrochemical device.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required to be used in the embodiments of the present application will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of an electrochemical device according to an exemplary embodiment of the present disclosure;
fig. 2 is a schematic structural view illustrating that an electrode assembly of the electrochemical device shown in fig. 1 is received in a case;
FIG. 3 is a schematic cross-sectional view of a first end portion of the electrode assembly shown in FIG. 2;
FIG. 4 is a schematic cross-sectional view of a second end portion of the electrode assembly shown in FIG. 2;
FIG. 5 is a schematic view illustrating a structure of an electrode assembly of an electrochemical device according to another exemplary embodiment of the present application;
FIG. 6 is a schematic view of the electrode assembly of FIG. 2, the first extension portion and the second extension portion being connected to each other;
FIG. 7 is a view schematically illustrating a structure in which a separation film has a plurality of first extension portions in another electrode assembly shown in FIG. 2;
FIG. 8 is a schematic view of another connection between the electrode assembly of FIG. 6 and the first and second extensions;
figure 9 is a schematic view of the connection between the first extension and the isolation diaphragm body of figure 3;
figure 10 is a schematic view of an alternative attachment between the first extension and the isolation diaphragm body of figure 3.
Detailed Description
In order to facilitate an understanding of the present application, the present application is described in more detail below with reference to the accompanying drawings and specific embodiments. It should be noted that when an element is referred to as being "fixed to" or "affixed to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may be present. The terms "vertical," "horizontal," "left," "right," "inner," "outer," and the like as used herein are for purposes of description only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
In addition, the technical features mentioned in the different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.
Referring to fig. 1 and 2, an electrochemical device according to an embodiment of the present invention includes a case 10, an electrode assembly 20, and an electrolyte (not shown), wherein the electrolyte is accommodated in the case 10, and the electrode assembly 20 is immersed in the electrolyte. The electrode assembly 20 includes a first pole piece 21, a separating film 22 and a second pole piece 23, wherein the separating film 22 is disposed between the first pole piece 21 and the second pole piece 23, so that the first pole piece 21 and the second pole piece 23 are spaced apart. Next, the specific structures of the case 10 and the electrode assembly 20 described above will be explained in order.
Referring to the case 10, and referring to fig. 1, the case 10 is substantially a flat hexahedron, and a receiving cavity (not shown) is formed inside the case and is used for receiving the electrode assembly 20 and the electrolyte. It should be noted here that the housing 10 is made of a metal material. On the one hand, the metal can block moisture from penetrating into the case 10, thereby preventing electrolyte in the electrolyte from flowing along the LiPF 6 Hydrolysis to hydrofluoric acid (HF). On the other hand, the metal also blocks the solvent from leaking out of the case 10 by diffusion from inside the case 10. For example, a housingThe shell 10 is a hard shell 10, which is generally made of one or more of aluminum alloy, stainless steel and titanium alloy magnesium alloy materials. For another example, the housing 10 is a soft-packed housing 10, which is generally formed by laminating a plurality of high-polished aluminum plastic films.
It should be understood that, in the embodiment of the present application, the shape of the housing 10 is not limited thereto. Since the specific shape of the case 10 depends on the shape of the electrode assembly 20 after being wound or stacked, the case 10 is also cylindrical when the electrode assembly 20 is wound in a cylindrical shape, or the case 10 is also square when the electrode assembly 20 is stacked in a square shape.
Referring to fig. 3 and 4, with reference to fig. 2, the electrode assembly 20 is accommodated in the accommodating cavity, and includes a first pole piece 21, a second pole piece 23 and a separating film 22 disposed therebetween for separating the two pole pieces. The first pole piece 21 and the second pole piece 23 have opposite polarities, one of the two pieces is a positive pole piece, and the other piece is a negative pole piece. The first pole piece 21, the second pole piece 23 and the isolation film 22 are stacked and wound into a cylindrical structure with a cross section in a waist-round shape so as to be accommodated in the accommodating cavity. It should be understood that, even though the present embodiment is described by taking the electrode assembly 20 as a cylindrical structure with a cross section in a shape of a kidney-round as an example, the present embodiment does not specifically limit the shape of the electrode assembly 20 in consideration of the variety of winding forms of the electrode assembly 20 and the easiness of deformation of the electrode assembly 20 during the use of the electrochemical device.
It should also be understood that the type of the electrode assembly 20 in the embodiment of the present application is not limited thereto. Such as a laminated electrode assembly 20 formed by stacking square laminates as shown in fig. 5, or a wound electrode assembly 20 formed by winding in a cylindrical winding manner, etc. The tabs may extend from any location on the electrode assembly 20 for different types of electrode assemblies 20, for example, from one end of the coiled electrode assembly 20 or from any one or more sides of the laminated electrode assembly 20. That is, the embodiment of the present application is illustrated only by way of a square flat rolled type electrode assembly 20, and does not limit the present application in any way.
Next, specific structures of the first pole piece 21, the second pole piece 23, and the separator 22 will be described.
As for the first electrode sheet 21, the first electrode sheet 21 has an overall strip-shaped structure, and includes a first current collector and a first active material base layer formed on the surface of the first current collector. Wherein the first current collector is made of a thin metal plate having good electrical conductivity, such as aluminum foil. The first active material base layer is formed by a first active material coated on a coating region of a first current collector, and the first active material may include a positive electrode active material, a conductive agent, and a binder. Chalcogenides may be used as the positive electrode active material. For example, complex metal oxides, such as LiCoO 2 、LiMn 2 O 4 、LiNi 2 O 4 、LiNi 1-X Co x O 2 (0 < x < 1) or LiMn 2 O 4 Can be used as a positive electrode active material. Of course, the positive electrode active material is not limited to these materials.
As for the aforementioned second pole piece 23, similarly to the first pole piece 21, the second pole piece 23 has an overall elongated strip-shaped structure including a second current collector and a second active material base layer formed on the surface of the second current collector. Wherein the second current collector is made of a conductive metal plate material, such as a copper foil or a nickel foil, and the second active material base layer may include a negative active material, a conductive agent, and a binder. The negative electrode active material may be selected from the group consisting of a carbon material, si, sn, tin oxide, composite tin alloy, transition metal oxide, lithium metal nitride, and lithium metal oxide. Of course, the anode active material is not limited to these materials.
With reference to the isolation film 22, please continue to refer to fig. 3 or fig. 4, the isolation film 22 includes an isolation film main body 221 and a first extending portion 222. The separator main body 221 has an overall elongated band-shaped structure, the first extension portion 222 extends from the separator main body 221 to the outside of the electrode assembly 20, and the first extension portion 222 is connected to the outer surface of the electrode assembly 20. The separator body 221 serves to prevent a short circuit between the first and second pole pieces 21 and 23 while allowing only lithium ions of the electrochemical device to pass therethrough. Among them, the separator 22 may be selected from the group consisting of polyethylene, polypropylene, and a copolymer of polyethylene and polypropylene. Of course, the separator 22 is not limited to these substances. It should be understood that the shape of the first extending portion 222 is not limited in the embodiment of the present application, for example, the shape of the first extending portion 222 is rectangular as shown in fig. 9 or 10, or the shape of the first extending portion 222 is triangular, or the shape of the first extending portion 222 is regular polyhedral.
The first extension part 222 extends out of the electrode assembly 20 from the first end part 20a, and the first extension part 222 is connected to the outer surface of the electrode assembly 20, so that the first pole piece 21 and/or the second pole piece 23 and the isolation film main body 221 jointly form the electrode assembly 20 for offsetting acting force applied to the isolation film main body 221 when the lithium ion battery falls on the ground, and the problem that the isolation film 22 shrinks when the isolation film main body 221 is impacted by the outside is solved.
In some embodiments, the isolation diaphragm 22 is formed by integrally molding the isolation diaphragm main body 221 and the first extending portion 222. For example, in the process of manufacturing the above-mentioned separator 22, a single separator 22 may be selected and cut in a predetermined shape of the separator main body 221 with the first extending portion 222 protruding therefrom, and the separator 22 thus obtained may ensure that the stacking thickness of the electrode assembly 20 along the first direction X is not changed, and may have a stable structural strength, so as to pull the separator main body 221 when the electrode assembly 20 is impacted from the outside, thereby preventing the separator main body 221 from shrinking, compared to the case where the separator 22 is obtained by bonding the separator main body 221 and the first extending portion 222. It should be noted here that the distance between both ends of the separation film main body 221 in the second direction Y thereof is greater than the distance between both ends of the first pole piece 21 or the second pole piece 23 in the second direction Y thereof. When the separator main body 221 is wound together with the first and second pole pieces 21 and 23, the separator main body 221 protrudes at both ends of the first and second pole pieces 21 and 23 in the second direction Y thereof, thereby preventing the edge portions of the first and second pole pieces 21 and 23 from being in direct contact and short-circuited.
In addition, referring to fig. 6 in combination with fig. 2, the electrode assembly 20 further includes a first tab 24 and a second tab 25. The first tab 24 is formed by an uncoated region extending from the coated region of the first pole piece 21, and further, the first tab 24 extends from the end surface of the first pole piece 21 in the second direction Y thereof outside the electrode assembly 20 to be connected to the positive electrode of the electrochemical device. The second tab 25 is formed of an uncoated region extending from the coated region of the second pole piece 23, and the second tab 25 extends from the end surface of the second pole piece 23 in the second direction Y thereof outside the electrode assembly 20 to be connected to a negative electrode of an electrochemical device. In some embodiments, the first tab 24 and the second tab 25 both extend out of the electrode assembly 20 from the same end surface of the electrode assembly 20, and the first tab 24 and the second tab 25 are spaced apart along the third direction Z, wherein the first extending portion 222 is located between the first tab 24 and the second tab 25.
For the reader to better understand the embodiment of the present application, the following description will proceed with reference to fig. 3 and 4 to describe how the first extension 222 is attached to the outer surface of the electrode assembly 20.
First, the second pole piece 23, the separator 221, the first pole piece 21, and the separator 222 are sequentially stacked in the first direction X to obtain the electrode assembly 20 having an elongated shape as a whole.
And then, the second pole piece 23, the isolation film 221, the first pole piece 21 and the isolation film 222 are stacked, and the outer surface of the winding needle extending in the second direction Y is wound anticlockwise, the winding needle is pulled out after the winding process is finished, and the winding electrode assembly 20 is subjected to hot-press shaping after the winding needle is pulled out, so that the winding electrode assembly 20 with the cross section in a shape of a waist circle is obtained. The isolation film 221 separates the surface of the second pole piece 23 facing the first pole piece 21 from the surface of the first pole piece 21 facing the second pole piece 23, the isolation film 222 separates the other surface of the second pole piece 23 facing the first pole piece 21 from the other surface of the first pole piece 21 facing the outside of the electrode assembly 20, and both the isolation film 221 and the isolation film 222 are used for preventing the first pole piece 21 and the second pole piece 23 from being short-circuited by surface contact or point contact.
The coiled electrode assembly 20 has a first end 20a facing upward and a second end 20b facing downward in the second direction Y, and the first extending portion 222 extends from the first end 20a along the second direction Y outside the electrode assembly 20 and is connected to the outer surface of the electrode assembly 20. Specifically, the first extension portion 222 is coupled to the outer surface of the electrode assembly 20 by the connection member 30. With this arrangement, the first extension is less likely to be detached from the outer surface of the electrode assembly. The first extension portion may be conveniently fixed to the outer surface of the electrode assembly using a double-sided adhesive tape. In some embodiments, the connection element 30 is double-sided adhesive tape, i.e., one surface of the first extension portion 222 is attached to one adhesive surface of the double-sided adhesive tape, and the other adhesive surface of the double-sided adhesive tape is attached to the outer surface of the electrode assembly 20. In some embodiments, the attachment 30 is single-sided gummed paper. It should be understood that in another embodiment of the present application, the connection member 30 may be replaced with another adhesive gel for coating the first extension 222 in an overlapping region with the outer surface of the electrode assembly 20 to connect the first extension 222 to the outer surface of the electrode assembly 20. Such as a tail-out glue, optionally but not necessarily, the components of the glue react more difficultly with the components of the electrolyte.
It should be noted that, in the embodiment of the present application, the outer surface of the electrode assembly 20 is formed by the electrode assembly 20 having an upward end surface and a downward end surface along the second direction Y, and another surface of the first pole piece 21 facing the outside of the electrode assembly 20. Specifically, the electrode assembly 20 having the end surface facing upward in the second direction Y means that the end surface facing upward of the second pole piece 23 excluding the end surface facing upward of the separator main body 221 is composed in common with the end surface facing upward of the first pole piece 21. Similarly, the electrode assembly 20 having the downward facing end surface in the second direction Y means that the upward facing end surface of the second pole piece 23 excluding the downward facing end surface of the separator main body 221 is composed in common with the upward facing end surface of the first pole piece 21. In other words, the first extension portion 222 is connected to the electrode assembly 20 through the connection member 30 at any position along the second direction Y where the end surface faces upward and the end surface faces downward, and the other surface faces the outside of the electrode assembly 20. Further, the first extension portion 222 is extended from the first end portion 20a of the separation film main body 221 adjacent to the second pole piece 23. The first extension part 222 is provided thereto because the first extension part 222 requires only a short length to be coupled to the outer surface of the electrode assembly 20, thereby effectively reducing the production cost.
Further, the first extension portion 222 surrounds the outer surface of the electrode assembly 20 at least one turn. That is, the first extension part 222 extends from the first end 20a of the electrode assembly 20 in the second direction Y out of the electrode assembly 20, surrounds the outer surface of the electrode assembly 20 at least one turn around the center axis in the third direction Z perpendicular to the second direction Y, and is connected to the outer surface of the electrode assembly 20. With this arrangement, the first extending portion 222 can fix both the end of the separation film main body 221 near the first end portion 20a of the electrode assembly 20 and the end of the separation film main body 221 near the second end portion 20b of the electrode assembly 20, thereby further enhancing the structural stability of the electrode assembly 20 and further enhancing the drop resistance of the electrochemical device. It should be understood that, in another embodiment of the present application, the first extension portion 222 may surround the outer surface of the electrode assembly 20 less than one turn, for example, the first extension portion 222 may extend only a portion of the first end portion 20a of the electrode assembly 20 to be connected to the end surface of the electrode assembly 20 facing upward in the second direction Y. Alternatively, the first extension part 222 protrudes a portion of the first end 20a of the electrode assembly 20 to be connected to the other surface of the second electrode sheet 23 facing the outside of the electrode assembly 20. Still alternatively, the first extension portion 222 extends out of a portion of the first end 20a of the electrode assembly 20 to be connected to the second end 20b of the electrode assembly 20 in the second direction Y.
In order to further improve the dropping performance of the electrochemical device, referring to fig. 7, optionally, the number of the first extending portions 222 is at least one, and the at least one first extending portion 222 is disposed at an upward end of the separation film main body 221 at intervals along the length direction of the separation film main body 221 when the separation film main body 221 is not wound, that is, the at least one first extending portion 222 is arranged in a staggered manner after the separation film main body 221 is wound. Wherein, the first extension parts 222 are different in length extending out of the electrode assembly 20.
To further improve the drop performance of the electrochemical device, referring to fig. 8, optionally, the separation film 22 further includes a second extension portion 223 integrally formed with the separation film main body 221. The second extension part 223 extends from the separation film main body 221 outside the electrode assembly 20, and the second extension part 223 is coupled to the outer surface of the electrode assembly 20. The second extending part is fixed on the outer surface of the electrode assembly, so that the structural integrity of the electrode assembly is improved, and the impact resistance of the electrode assembly is improved. It is noted that the second extension portion 223 is extended from the other side of the first end portion 20a of the separation film main body 221 adjacent to the second electrode sheet 23, in other words, the first extension portion 222 and the second extension portion 223 are each independently disposed adjacent to the outermost turn of the electrode assembly 20. The second extension portion 223 is provided thereto because the second extension portion 223 requires only a short length to be coupled to the outer surface of the electrode assembly 20, thereby effectively reducing the production cost. Of course, the second extension 223 may be connected to the isolation diaphragm body 221 by adhesion. It should be understood that the shape of the second extension portion 223 is not limited in the embodiment of the present application, for example, the shape of the second extension portion 223 is rectangular as shown in fig. X, or the shape of the second extension portion 223 is triangular, or the shape of the second extension portion 223 is also regular polyhedral.
Specifically, the second extending portion 223 is disposed at the first end 20a of the electrode assembly 20 at an interval from the first extending portion 222 in the first direction X. The second extending portion 223 and the first extending portion 222 extend out of the electrode assembly 20 from the second direction Y, wherein the second extending portion 223 is bent along the first direction X and surrounds counterclockwise with the third direction Z as a central axis, the first extending portion 222 is bent along the direction opposite to the first direction X and surrounds clockwise with the third direction Z as a central axis, the second extending portion 223 and the first extending portion 222 can be connected to the outer surface of the electrode assembly 20 through the connecting member 30, or the second extending portion 223 and the first extending portion 222 can be adhered to the outer surface of the electrode assembly 20 through glue. That is, the first extension portion and the second extension portion extend from the same end of the separation film and are fixed to the outer surface of the electrode assembly. Compared with the fixation of the first extending part, the contraction degree of the isolating membrane after the impact is further reduced after the isolating membrane is impacted. In some embodiments, the attachment member 30 is double-sided adhesive paper.
To further improve the drop performance of the electrochemical device, the separator 22 may further include a second extension part 223 integrally formed with the separator main body 221. The second extension part 223 extends from the separation film main body 221 outside the electrode assembly 20, and the second extension part 223 is coupled to the outer surface of the electrode assembly 20. Unlike the separator 22, the second extension portion 223 and the first extension portion 222 are disposed at intervals in the second direction Y at the first end portion 20a and the second end portion 20b of the electrode assembly 20. It is noted that the second extension portion 223 is extended from the other side of the second end portion 20b of the separation film main body 221 adjacent to the second electrode sheet 23, in other words, the first extension portion 222 and the second extension portion 223 are each independently disposed adjacent to the outermost turn of the electrode assembly 20. The second extension portion 223 is provided thereto because the second extension portion 223 requires only a short length to be coupled to the outer surface of the electrode assembly 20, thereby effectively reducing the production cost. Of course, the second extension 223 may be connected to the isolation diaphragm body 221 by adhesion. It should be understood that the shape of the second extension 223 is not limited in the embodiment of the present application, for example, the shape of the second extension 223 may be rectangular, or the shape of the second extension 223 may be triangular, or the shape of the second extension 223 may also be regular polyhedral.
Specifically, the first extending portion 222 is disposed at the first end 20a of the electrode assembly 20, and the second extending portion 223 is disposed at the second end 20b of the electrode assembly 20, wherein the first extending portion 222 extends out of the electrode assembly 20 from the second direction Y, the first extending portion 222 can be bent along the first direction X or a direction opposite to the first direction X, and can rotate clockwise or counterclockwise with the third direction Z as a central axis, and the first extending portion 222 can be connected to the outer surface of the electrode assembly 20 through the connecting member 30 or a tail-end adhesive. The second extension portion 223 extends out of the electrode assembly 20 from a direction opposite to the second direction Y, the second extension portion 223 may be bent in the first direction X or a direction opposite to the first direction X and may rotate clockwise or counterclockwise with the third direction Z as a central axis, and the second extension portion 223 may be connected to an outer surface of the electrode assembly 20 by a connection member 30 or a finishing glue. In some embodiments, first extension 222 and second extension 223 are coupled via connector 30. Wherein, the connecting piece 30 is double-faced adhesive tape.
It should be noted that "upward" and "downward" in the embodiments of the present application refer to the orientation in which the electrode assembly 20 is accommodated in the case 10. For example, the wound electrode assembly 20 or the stacked electrode assembly 20 is accommodated in the case 10, and the upward direction means the same direction in which the first tab 24 and the second tab 25 of the electrode assembly 20 extend, and the downward direction means the opposite direction to the upward direction, that is, the direction away from the first tab 24 and the second tab 25 of the electrode assembly 20. In addition, in the embodiment of the present application, any two of the first direction X, the second direction Y, and the third direction Z are perpendicular to each other. Here, the first direction X refers to a direction in which the second pole piece 23, the separator 22, the first pole piece 21, and the separator 22 are sequentially stacked, and may be also understood as a thickness direction of the electrode assembly 20, the second direction Y refers to a winding direction of the electrode assembly 20, and may also be understood as a width direction of the electrode assembly 20, and the third direction Z refers to a winding direction of the first extending portion 222 or the second extending portion 223, and may also be understood as a length direction of the electrode assembly 20.
In the embodiment of the present application, the first extension portion 222 extends out of the electrode assembly 20 from the first end portion 20a, and the first extension portion 222 is connected to the outer surface of the electrode assembly 20, so that the first pole piece 21 and/or the second pole piece 23 and the main separator body 221 together form the electrode assembly 20 for canceling the force applied to the main separator body 221 when the lithium ion battery falls on the ground, thereby improving the problem that the main separator body 221 contracts when being impacted by the outside to cause the separator 22 to contract.
Based on the same inventive concept, another embodiment of the application also provides an electric device. The electric device comprises the electrochemical device and the load in the embodiment. In this embodiment, the electric device is a mobile phone; it is understood that, in other embodiments of the present application, the electric device may also be a tablet computer, a drone, or other electric devices that need to be driven by electricity.
The above description is only for the purpose of illustrating embodiments of the present application and is not intended to limit the scope of the present application, and all modifications of equivalent structures and equivalent processes, which are made by the contents of the specification and the drawings of the present application or are directly or indirectly applied to other related technical fields, are also included in the scope of the present application.
Claims (10)
1. An electrochemical device comprising an electrode assembly including a first pole piece, a separator, and a second pole piece stacked in a first direction, the electrode assembly having a first end and a second end in a second direction, the second direction being perpendicular to the first direction,
the separation film includes a first extension portion extending from the first end portion out of the electrode assembly, and the first extension portion is connected to an outer surface of the electrode assembly.
2. The electrochemical device according to claim 1,
the first extension part surrounds the outer surface of the electrode assembly at least one turn.
3. The electrochemical device according to claim 1,
the electrochemical device further includes a connector configured to fix the first extension to an outer surface of the electrode assembly.
4. The electrochemical device according to claim 1,
the separator further includes a second extension portion extending from the electrode assembly outside the electrode assembly, and the second extension portion is fixed to an outer surface of the electrode assembly.
5. The electrochemical device according to claim 4, wherein the electrochemical device satisfies at least one of the following conditions:
the first extension portion and the second extension portion are arranged at intervals along the first direction; or
The first extension portion and the second extension portion are disposed at an interval in the second direction.
6. The electrochemical device according to claim 4, wherein the electrochemical device satisfies at least one of the following conditions:
the first and second extension portions are independently provided at the first or second end of the electrode assembly; or
The first and second extension portions are each independently disposed adjacent to an outermost turn of the electrode assembly along the first direction.
7. The electrochemical device according to claim 4,
the first and second extension portions are disposed at a first end portion of the electrode assembly, and the first extension portion is bent in the first direction and the second extension portion is bent in a direction opposite to the first direction.
8. The electrochemical device according to claim 1,
the electrode assembly further includes a first tab and a second tab;
the first tab is connected with the anode of the electrochemical device, the second tab is connected with the cathode of the electrochemical device, the first tab and the second tab are arranged at intervals along a third direction, and the first extending portion is located between the first tab and the second tab.
9. The electrochemical device according to any one of claims 1 to 8,
the isolating membrane further comprises an isolating membrane main body, and the first extending portion and the isolating membrane main body are integrally formed.
10. An electrical device comprising a load and an electrochemical device according to any one of claims 1 to 9, the load being electrically connected to the electrochemical device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110680719.4A CN115498366B (en) | 2021-06-18 | Electrochemical device and electric equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110680719.4A CN115498366B (en) | 2021-06-18 | Electrochemical device and electric equipment |
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| Publication Number | Publication Date |
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| CN115498366A true CN115498366A (en) | 2022-12-20 |
| CN115498366B CN115498366B (en) | 2024-07-05 |
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