CN113285055A - Electrode plate and application thereof - Google Patents
Electrode plate and application thereof Download PDFInfo
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- CN113285055A CN113285055A CN202110594843.9A CN202110594843A CN113285055A CN 113285055 A CN113285055 A CN 113285055A CN 202110594843 A CN202110594843 A CN 202110594843A CN 113285055 A CN113285055 A CN 113285055A
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Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
- H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/64—Carriers or collectors
- H01M4/66—Selection of materials
- H01M4/665—Composites
- H01M4/667—Composites in the form of layers, e.g. coatings
-
- 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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Composite Materials (AREA)
- Secondary Cells (AREA)
- Connection Of Batteries Or Terminals (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
The invention provides an electrode slice and application thereof. The first functional surface of a current collector in the electrode plate comprises a first active layer region and a first tab region, the second functional surface of the current collector comprises a second active layer region opposite to the first active layer region and a second tab region opposite to the first tab region, and the active layer is arranged in the first active layer region and/or the second active layer region; the first tab area is provided with N through holes penetrating to the second tab area, the T-shaped tab passes through the through holes, one end of the first section of the T-shaped tab is connected with the first tab area to form a first connection area, the other end of the first section of the T-shaped tab is connected with the first tab area to form a second connection area, the second section of the T-shaped tab is connected with the second tab area to form a third connection area, and N is more than or equal to 1; the current collector comprises a first conducting layer, an insulating layer and a second conducting layer which are arranged in a stacked mode. The lithium ion battery prepared by the electrode plate has higher mass energy density and safety performance.
Description
Technical Field
The invention relates to the technical field of batteries, in particular to an electrode plate and application thereof.
Background
Since the first commercial lithium ion battery was released by sony corporation in 1991, lithium ion batteries have been widely used in consumer electronics, electric vehicles, and energy storage.
The existing lithium ion battery usually adopts aluminum foil as a positive current collector and copper foil as a negative current collector. To increase the energy density of lithium ion batteries, aluminum or copper foil may be combined with lighter weight polymeric materials to form new current collectors, such as aluminum-polymer-aluminum current collectors, copper-polymer-copper current collectors. The novel current collector with the sandwich structure has the advantages that the surface density is smaller, the weight of a lithium ion battery can be reduced, the energy density is improved, and when the battery is short-circuited, the battery is heated to a certain temperature, the polymer material can deform, so that a current loop is cut off, and the novel current collector has better safety compared with a conventional copper foil and an aluminum foil.
However, since the polymer material in the current collector having such a structure is not conductive, when a tab is welded to one surface of the current collector, the other surface of the current collector cannot be conductive, and thus a new welding method needs to be developed.
Disclosure of Invention
The invention provides an electrode plate which can conduct two sides of a current collector and can improve the quality energy density and the safety performance of a lithium ion battery.
The present invention provides an electrochemical device having high mass energy density and safety performance.
The invention provides an electrode plate, which comprises a current collector, an active layer and a T-shaped tab, wherein a first functional surface of the current collector comprises a first active layer region and a first tab region, a second functional surface of the current collector comprises a second active layer region opposite to the first active layer region and a second tab region opposite to the first tab region, and the active layer is arranged in the first active layer region and/or the second active layer region;
the first tab area is provided with N through holes penetrating to the second tab area, the T-shaped tab passes through the through holes, one end of a first section of the T-shaped tab is connected with the first tab area to form a first connection area, the other end of the first section of the T-shaped tab is connected with the first tab area to form a second connection area, a second section of the T-shaped tab is connected with the second tab area to form a third connection area, and N is more than or equal to 1;
the current collector comprises a first conducting layer, an insulating layer and a second conducting layer which are arranged in a stacked mode;
the first functional surface is a surface of the first conductive layer far away from the insulating layer, and the second functional surface is a surface of the second conductive layer far away from the insulating layer.
The electrode sheet as described above, wherein either one end of the first section or the second section extends out of the current collector.
The electrode sheet as described above, wherein in the first direction of the current collector, the minimum distance between the edge of the M through holes and the edge of the current collector is W1, and W1 is greater than or equal to 1 mm; and/or the presence of a gas in the gas,
in the second direction of the current collector, the minimum distance between the edges of the M through holes and the edge of the first active layer area and/or the edge of the second active layer area is L1, L1 is more than or equal to 2mm, and M is less than or equal to N.
The electrode sheet as described above, wherein, in the first direction of the current collector, a ratio of a minimum distance W1 between edges of the M through holes and the edge of the current collector to a dimension W0 of the first tab region and/or the second tab region is (0.2-0.8): 1.
the electrode sheet as described above, wherein the ratio of the area of the through-hole to the cross-sectional area of the second section is (1.2-50): 1.
the electrode plate is characterized in that in the first direction of the current collector, the minimum distance between the edge of the connecting area and the edges of the M through holes is not less than 1 mm;
wherein the connection region comprises at least one of the first connection region, the second connection region, and the third connection region; and/or the presence of a gas in the gas,
in the first direction of the current collector, the minimum distance between the edge of the connecting area and the edge of the current collector is more than or equal to 1 mm;
wherein the connection region comprises at least one of the first connection region, the second connection region, and the third connection region.
The electrode sheet as described above, wherein the first functional surface and/or the second functional surface is provided with a protective layer, the protective layer covers W through holes, the protective layer has openings at positions corresponding to the W through holes, and W is not greater than N.
The electrode sheet as described above, wherein the thickness of the protective layer is 0.5 to 50 μm.
The electrode sheet as described above, wherein the area of the protective layer is 1.2-5 times the area of the M through holes.
The invention also provides an electrochemical device, which comprises the electrode plate.
The through hole penetrating to the second tab area is formed in the first tab area, the T-shaped tab penetrates through the through hole, the two ends and the second section of the first section of the T-shaped tab are respectively connected with the first tab area and the second tab area, the two sides of the current collector can be conducted, the quality energy density of the lithium ion battery is improved, the T-shaped tab can better balance the stress around the through hole, the through hole is effectively prevented from cracking, the welding yield is improved, the service life of the electrode plate can be prolonged, and the service life of the lithium ion battery is further prolonged; more welding points can be formed in the T-shaped lug, the first lug area and the second lug area, the welding resistance of the lug is reduced, and the multiplying power charge and discharge performance of the lithium ion battery is improved. Meanwhile, the current collector comprises the insulating layer with lighter weight, so that the mass energy density of the lithium ion battery can be further improved; and when the temperature of the battery is raised to a certain temperature, the insulating layer can deform to cut off the internal current of the battery, so that the safety performance of the lithium ion battery 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 top view of a current collector in the present invention;
fig. 2 is a structural schematic diagram of a T-shaped tab in the invention;
fig. 3 is a plan view of an electrode sheet according to a first embodiment of the present invention;
FIG. 4 is a first cross-sectional view taken along line X-X of FIG. 3 in accordance with the present invention;
FIG. 5 is a second cross-sectional view taken along line X-X of FIG. 3 in accordance with the present invention;
fig. 6 is a plan view of an electrode sheet according to a second embodiment of the present invention;
fig. 7 is a plan view of an electrode sheet in a third embodiment of the present invention;
FIG. 8 is a cross-sectional view taken at line X-X of FIG. 6 or FIG. 7 in accordance with the present invention;
fig. 9 is a plan view of an electrode sheet in a fourth embodiment of the present invention;
FIG. 10 is a cross-sectional view taken at line X-X of FIG. 9 in accordance with the present invention;
FIG. 11 is a schematic view of the structure of a winding core according to example 1 of the present invention;
FIG. 12 is a schematic view of the structure of a winding core according to example 2 of the present invention;
fig. 13 is a schematic structural view of a winding core according to embodiment 3 of the present invention.
Description of reference numerals:
1: t-shaped pole lugs;
2: a first active layer region;
3: a first tab region;
4: a through hole;
5: a first connection region:
6: second polar ear region:
7: a second attachment zone;
8: a third attachment zone;
9: second active layer region
10: a protective layer;
1 a: a first stage;
1 b: and a second section.
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 top view of an inventive current collector. As shown in fig. 1, all definitions of "length" and "width" are hereinafter referred to in terms of the "length L direction" and the "width W direction" of the current collector. Taking the first functional surface and/or the second functional surface of the current collector (the first functional surface and the second functional surface refer to two largest and opposite surfaces of the current collector) as a rectangle as an example, the length L direction of the current collector refers to the direction where the largest side length of the functional surface of the current collector is located, and the width W direction of the current collector refers to the direction where the smallest side length of the functional surface of the current collector is located. For example, the width of the first tab region and/or the second tab region defined by the present invention is W0, which means that the size of the first tab region and/or the second tab region in the width direction of the current collector is W0.
Fig. 2 is a structural schematic diagram of a T-shaped tab in the invention; fig. 3 is a plan view of an electrode sheet according to a first embodiment of the present invention; FIG. 4 is a first cross-sectional view taken along line X-X of FIG. 3 in accordance with the present invention; FIG. 5 is a second cross-sectional view taken along line X-X of FIG. 3 in accordance with the present invention; fig. 6 is a plan view of an electrode sheet according to a second embodiment of the present invention; fig. 7 is a plan view of an electrode sheet in a third embodiment of the present invention; fig. 8 is a cross-sectional view taken along line X-X of fig. 6 or 7 in accordance with the present invention. As shown in fig. 2 to 8, the present invention provides an electrode sheet, including a current collector, an active layer, and a T-shaped tab 1, wherein a first functional surface of the current collector includes a first active layer region 2 and a first tab region 3, a second functional surface of the current collector includes a second active layer region 9 opposite to the first active layer region 2 and a second tab region 6 opposite to the first tab region 3, and the active layer is disposed in the first active layer region 1 and/or the second active layer region 9;
the first tab area 3 is provided with N through holes 4 penetrating to a second tab area 6, the T-shaped tab 1 passes through the through holes 4, one end of a first section 1a of the T-shaped tab 1 is connected with the first tab area 3 to form a first connecting area 5, the other end of the first section 1a of the T-shaped tab 1 is connected with the first tab area 3 to form a second connecting area 7, a second section 1b of the T-shaped tab 1 is connected with the second tab area 6 to form a third connecting area 8, and N is more than or equal to 1;
the current collector comprises a first conducting layer, an insulating layer and a second conducting layer which are arranged in a stacked mode;
the first functional surface is a surface of the first conductive layer away from the insulating layer, and the second functional surface is a surface of the second conductive layer away from the insulating layer.
As shown in fig. 2, in the present invention, a first section 1a of the T-shaped tab 1 refers to a section horizontally disposed in the T-shaped tab 1, a second section 1b of the T-shaped tab 1 refers to a section vertically disposed in the T-shaped tab 1, and the first section 1a and the second section 1b intersect perpendicularly. The first section 1a of the T-shaped tab 1 has two ends which are respectively positioned at two sides of the intersection point of the first section 1a and the second section 1 b.
The present invention does not limit the specific locations of the first tab region 3 and the first active layer region 2. As shown in fig. 3, the first tab region 3 of the present invention may be disposed at one longitudinal side of the first active layer region 2; as shown in fig. 6, the first tab region 3 according to the present invention may be disposed on one side of the first active layer region 2 in the width direction, and three sides of the first tab region 3 may be adjacent to the first active layer region 2; as shown in fig. 7, the first tab region 3 according to the present invention may be further disposed on one side of the first active layer region 2 in the width direction, and one side of the first tab region 3 is adjacent to the first active layer region 2.
In the present invention, the second tab region 6 is disposed opposite to the first tab region 3, and the second active layer region 9 is disposed opposite to the first active layer region 2. It is to be understood that the projection of the second tab region 6 onto the first tab region 3 may completely coincide with the first tab region 3, and the projection of the second active layer region 9 onto the first active layer region 2 may completely coincide with the first active layer region 2; the projection of the second tab region 6 onto the first tab region 3 may not completely coincide with the first tab region 3, or the projection of the second active layer region 9 onto the first active layer region 2 may not completely coincide with the first active layer region 2. The active layer of the present invention may be provided in the first active layer region 2, may be provided in the second active layer region 9, or may be provided in both the first active layer region 2 and the second active layer region 9.
The invention is characterized in that N through holes 4 penetrating to a second tab area 6 are arranged in a first tab area 3, and a T-shaped tab 1 passes through the through holes 4. It can be understood that the electrode plate of the invention can have N T-shaped tabs 1, and N is less than or equal to N. When N is equal to N, each T-shaped lug 1 passes through one through hole 4, one end of the first section 1a of each T-shaped lug 1 is connected with the first lug area 3 to form a first connection area 5, the other end of the first section 1a of each T-shaped lug 1 is connected with the first lug area 3 to form a second connection area 7, and the second section 1b of each T-shaped lug 1 is connected with the second lug area 6 to form a third connection area 8; when N is less than N, each T-shaped lug 1 passes through one through hole 4, one end of the first section 1a of each T-shaped lug 1 is connected with the first lug area 3 to form a first connection area 5, the other end of the first section 1a of each T-shaped lug 1 is connected with the first lug area 3 to form a second connection area 7, the second section 1b of each T-shaped lug 1 is connected with the second lug area 6 to form a third connection area 8, and the rest through holes 4 are reserved.
The shape of the through hole 4 is not limited, and all shapes which can enable the T-shaped tab 1 to pass through are within the protection scope of the invention. In some embodiments, the shape of the through hole 4 may be rectangular, circular, polyhedral, elliptical, and in particular embodiments, the shape of the through hole 4 is elliptical.
The first connection region 5 in the present invention refers to a position where one end of the first segment 1a is fixed to the first tab region 3, the second connection region 7 refers to a position where the other end of the first segment 1a is fixed to the first tab region 3, and the third connection region 8 refers to a position where the second segment 1b is fixed to the second tab region 6. If the two ends of the first section 1a of the T-shaped tab 1, the second section 1b, the first tab area 3 and the second tab area 6 are fixed by welding, the first connection area 5 and the second connection area 7 are areas where the welding spots are located when the two ends of the first section 1a are welded with the first tab area 3, and the third connection area 8 is an area where the welding spots are located when the second section 1b is welded with the second tab area 6.
In the invention, in the width direction of the current collector, the first connecting area 5 and the second connecting area 7 are respectively positioned at two sides of the through hole; the third connection region 8 can be arranged on the same side as the first connection region 5, as shown in fig. 4, or the third connection region 8 can also be arranged on the same side as the second connection region 7, as shown in fig. 5.
In the invention, the insulating layer comprises at least one of a high polymer material and a high polymer-based composite material, namely the insulating layer can be a polymer layer;
further, the polymer material is at least one of polyamide, polyimide, polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polycarbonate, polyethylene, polypropylene, acrylonitrile-butadiene-styrene copolymer, polyvinyl alcohol, polystyrene, polyvinyl chloride, polyvinylidene fluoride, polytetrafluoroethylene, sodium polystyrene sulfonate, polyacetylene, silicone rubber, polyoxymethylene, polyphenylene ether, polyphenylene sulfide, polyethylene glycol, a sulfur nitride-based polymer material, polystyrene, polypyrrole, polyaniline, polythiophene, polypyridine, cellulose, starch, protein, an epoxy resin, a phenol resin, a derivative thereof, a crosslinked product thereof, and a copolymer thereof.
The material of the first conductive layer and/or the second conductive layer comprises at least one of a metal conductive material and a carbon-based conductive material.
The metal conductive material may include at least one of aluminum, copper, nickel, titanium, silver, nickel-copper alloy, and aluminum-zirconium alloy.
The carbon-based conductive material may include at least one of graphite, acetylene black, graphene, and carbon nanotubes.
When the material of the first conductive layer and/or the second conductive layer is a metal conductive material, the first conductive layer and/or the second conductive layer is a metal conductive layer. At this time, if the current collector is a positive current collector, the metal conductive material is usually aluminum; if the current collector is a negative electrode current collector, copper is generally used as the metal conductive material. In the present invention, if the insulating layer is a polymer layer, the first conductive layer and the second conductive layer are both metal conductive layers.
The first conductive layer and the insulating layer and/or the second conductive layer and the insulating layer may further include a transition layer, and a material of the transition layer includes, but is not limited to, at least one of aluminum oxide, magnesium oxide, or titanium oxide.
The first conductive layer, the second conductive layer or the insulating layer may further include a via hole. The present invention is not limited to the specific shape of the through-hole, and the shape of the through-hole may be rectangular, circular, polyhedral or elliptical, and in a specific embodiment, the shape of the through-hole is elliptical.
The current collector is provided with the through hole 4 penetrating through the first tab area 3 and the second tab area 6, the T-shaped tab 1 penetrates through the through hole 4, two ends of the first section 1a of the T-shaped tab are respectively connected with the first tab area 3, and the second section 1b of the T-shaped tab 1 is connected with the second tab area 6, so that two surfaces of the current collector can be conducted, the quality energy density of the lithium ion battery is improved, the T-shaped tab 1 can better balance the stress around the through hole 4, the through hole 4 is effectively prevented from cracking, the service life of an electrode plate is prolonged, and the service life of the lithium ion battery is further prolonged; the T-shaped tab 1, the first tab area 3 and the second tab area 6 can form more welding points, and the T-shaped tab is also beneficial to reducing the welding resistance of the tab and improving the multiplying power charge and discharge performance of the lithium ion battery. Meanwhile, the current collector comprises the insulating layer with lighter weight, so that the mass energy density of the lithium ion battery can be further improved; and when the temperature of the battery is raised to a certain temperature, the insulating layer can deform to cut off the internal current of the battery, so that the safety performance of the lithium ion battery is improved.
In the invention, either one end of the first section 1a or the second section 1b extends out of the current collector for connecting with an external tab.
As shown in fig. 3-8, in some embodiments of the present invention, the minimum distance between the edge of the M through holes 4 and the edge of the current collector in the first direction of the current collector is W1, W1 ≧ 1 mm;
in the second direction of the current collector, the minimum distance between the edge of the M through holes and the edge of the first active layer region 2 and/or the edge of the second active layer region 9 is L1, L1 is more than or equal to 2mm, and M is less than or equal to N.
In the present invention, the first direction of the current collector may be a width direction of the current collector, or may be a length direction of the current collector. When the first direction of the current collector is the width direction of the current collector, the second direction of the current collector is the length direction of the current collector; when the first direction of the current collector is the length direction of the current collector, the second direction of the current collector is the width direction of the current collector.
In the invention, when the first direction of the current collector is the width direction of the current collector, the obtained electrode plate can be used for preparing a lithium ion battery with a winding structure; when the first direction of the current collector is the length direction of the current collector, the obtained electrode sheet can be used for preparing a lithium ion battery with a laminated structure.
In the present invention, the minimum distance between the edge of the through-hole 4 and the edge of the current collector refers to the distance between the edge of the closest through-hole 4 and the edge of the current collector, and the minimum distance between the edge of the through-hole 4 and the edge of the first active layer region 2 and/or the second active layer region 9 refers to the distance between the edge of the closest through-hole 4 and the edge of the first active layer region 2 and/or the second active layer region 9. It can be understood that, in the present invention, the minimum distance between the edge of at least M through holes 4 and the edge of the current collector in the first direction of the current collector is W1, where W1 is greater than or equal to 1mm, and the minimum distance between the edge of at least M through holes 4 and the edge of the first active layer region 2 and/or the second active layer region 9 in the second direction of the current collector is L1, where L1 is greater than or equal to 2 mm. Through this setting, can prolong the life of electrode slice.
As shown in fig. 3-8, in some embodiments of the present invention, in the first direction of the current collector, the ratio of the minimum distance W1 between the edges of the M through holes 4 and the edge of the current collector to the dimension W0 of the first tab region 3 and/or the second tab region 6 is (0.2-0.8): 1.
in the invention, if the ratio of W1 to W0 is too large or too small, the through hole 4 is too close to the edge of the current collector, the through hole is easy to crack during the long-term use of the electrode plate, the service life of the electrode plate is short, and the operability of welding is not facilitated. The invention defines the ratio of W1 to W0 as (0.2-0.8): 1, the operability of welding can be facilitated on the premise of ensuring the service life of the electrode plate.
In some embodiments of the invention, the ratio of the area of the through-hole 4 to the cross-sectional area of the second section 1b is (1.2-50): 1.
in the present invention, the cross-sectional area of the second segment 1b refers to the area of the cross-section of the second segment 1b in the horizontal direction. In the invention, when the ratio of the area of the through hole 4 to the cross-sectional area of the second section 1b is too large, the vacant area in the through hole 4 is too large, and the electrode plate is easy to be damaged in the long-term use process; when the ratio of the area of the through hole 4 to the cross-sectional area of the second section 1b is too small, the second section 1b easily cracks the through hole 4 during long-term use of the electrode sheet, and the service life of the electrode sheet is reduced. The present invention defines the ratio of the area of the through-hole 4 to the cross-sectional area of the second section 1b to be (1.2-50): 1, in this scope, through-hole 4 is difficult to the fracture, and electrode slice is difficult to take place to damage in long-term use, and electrode slice has longer life. Further, the ratio of the area of the through-hole 4 to the cross-sectional area of the second section 1b is (5-15): 1
Further, in order to prolong the service life of the electrode plate, in some embodiments of the invention, the minimum distance between the edge of the connection region and the edges of the M through holes 4 in the first direction of the current collector is greater than or equal to 1 mm; wherein the attachment area comprises at least one of a first attachment area 5, a second attachment area 7 and a third attachment area 8; and/or the presence of a gas in the gas,
in the first direction of the current collector, the minimum distance between the edge of the connecting area and the edge of the current collector is more than or equal to 1mm, wherein the connecting area comprises at least one of the first connecting area 5, the second connecting area 7 and the third connecting area 8.
Fig. 9 is a plan view of an electrode sheet in a fourth embodiment of the present invention; fig. 10 is a cross-sectional view taken at a position along line X-X of fig. 9 in accordance with the present invention. As shown in fig. 9 or 10, in some embodiments of the present invention, in order to protect the through holes 4, prevent the through holes 4 from cracking, and prolong the service life of the electrode sheet, a protective layer 10 is disposed on the first functional surface and/or the second functional surface, the protective layer 10 covers W through holes 4, the protective layer 10 has openings at corresponding positions of the W through holes 4, and W is equal to or less than N.
The specific type of the protective layer 10 is not limited in the present invention, and the protective layer 10 may be an insulating material or a conductive material. In particular embodiments, the protective layer 10 may be a protective adhesive paper or a ceramic layer. The corresponding positions of the W through holes 4 refer to positions of projections of the W through holes 4 on the protective layer 10. It is understood that the protective layer 10 has an opening at the via 4, and the size and shape of the opening of the protective layer 10 may be the same as the via 4 or different from the via 4.
In some embodiments of the present invention, the thickness of the protective layer 10 is 0.5 to 50 μm.
In the present invention, if the thickness of the protective layer 10 is too thick, the mass energy density of the electrode sheet is reduced, and if the thickness of the protective layer 10 is too thin, the through-hole 4 cannot be sufficiently protected, and the service life of the electrode sheet is short. The thickness of the protective layer 10 is limited to be 0.5-50 mu m, so that the through holes 4 can be protected, the service life of the electrode plate is prolonged, and the mass energy density of the electrode plate is not reduced.
In some embodiments of the present invention, the area of the protective layer 10 is 1.2 to 5 times the area of the M through holes 4.
In the present invention, if the area of the protective layer 10 (including the area of the opening of the protective layer 10) is too large, the mass energy density of the electrode sheet is not only reduced, but also the T-shaped tab 1 is not easily connected to the first tab region 3 and/or the second tab region 6, and if the area of the protective layer 10 is too small, the through hole 4 cannot be sufficiently protected, and the service life of the electrode sheet is short. The area of the protective layer 10 is limited to be 1.2-5 times of the area of the through hole 4, so that the mass energy density of the electrode plate can be ensured, the T-shaped electrode lug 1 can be normally connected with the first electrode lug area 3 and/or the second electrode lug area 6, the through hole 4 can be protected, and the service life of the electrode plate can be prolonged.
The electrode plate can be a positive plate or a negative plate.
When the electrode sheet is a positive electrode sheet, the active layer of the present invention is a positive electrode active layer disposed on the surface of the positive electrode current collector. The positive active layer is obtained by drying positive active slurry, and the positive active slurry comprises a positive active substance, a conductive agent and a binder; the positive active material comprises at least one of Lithium Cobaltate (LCO), a nickel-cobalt-manganese ternary material (NCM), a nickel-cobalt-aluminum ternary material (NCA), a nickel-cobalt-manganese-aluminum quaternary material (NCMA), lithium iron phosphate (LFP), Lithium Manganese Phosphate (LMP), Lithium Vanadium Phosphate (LVP), Lithium Manganate (LMO) or a lithium-rich manganese base.
When the electrode sheet is a negative electrode sheet, the active layer of the present invention is a negative electrode active layer disposed on the surface of the negative electrode current collector. The negative active layer is obtained by drying negative active slurry, and the negative active slurry comprises a negative active substance, a conductive agent and a binder; the negative active material comprises at least one of graphite, mesocarbon microbeads, soft carbon, hard carbon, silicon materials, silica materials, silicon carbon materials or lithium titanate.
The conductive agent in the positive electrode active slurry and the negative electrode active slurry comprises at least one of conductive carbon black, carbon nanotubes, conductive graphite or graphene.
The binder in the positive active slurry and the negative active slurry comprises at least one of polyvinylidene fluoride, vinylidene fluoride-hexafluoropropylene copolymer, polyamide, polyacrylonitrile, polyacrylate, polyacrylic acid, polyacrylate, sodium carboxymethyl cellulose, polyvinylpyrrolidone, polyvinyl ether, polymethyl methacrylate, polytetrafluoroethylene, polyhexafluoropropylene or styrene butadiene rubber.
The second aspect of the present invention provides an electrochemical device comprising the electrode sheet described above, and further comprising an outer 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.
The electrochemical device of the present invention can have high mass energy density and safety performance due to the inclusion of the electrode sheet.
The invention is further illustrated by the following specific examples in which all parts, percentages, and ratios recited in the following examples are by weight, and all reagents used in the examples are commercially available or synthesized according to conventional methods and used as such without further treatment, and the equipment used in the examples is commercially available.
Example 1
The lithium ion battery of the present embodiment is obtained by the following steps:
1) preparation of positive plate
As shown in fig. 9 and 10, the positive electrode current collector includes a first tab region 3 and a first active layer region 2 in a length direction, a second tab region 6 is arranged corresponding to the first tab region 3, a second active layer region 9 is arranged corresponding to the first active layer region 2, the first tab region 3 is provided with a through hole 4 penetrating to the second tab region 6, and the through hole 4 is elliptical;
coating lithium cobaltate active slurry on the first active layer region 2 and the second active layer region 9, attaching protective gummed paper on the first tab region 3 and the second tab region 6, and then forming holes in the protective gummed paper at the through holes 4, wherein the holes are oval; wherein the lithium cobaltate active slurry comprises the following components in percentage by mass: conductive carbon black: conductive carbon tubes: PVDF 97%: 1%: 0.5%: 1.5 percent, the thickness of the protective adhesive paper is 12 mu m, and the ratio of the area of the open pore of the adhesive paper to the area of the through hole 4 is 1: 1;
the material is during T type utmost point ear 1 interlude into through-hole 4 of Al, the one end welding of the first section 1a of T type utmost point ear 1 forms first joining region 5 at first utmost point ear regional 3, the other end welding of the first section 1a of T type utmost point ear 1 forms second joining region 7 at first utmost point ear regional 3, the second section 1b welding of T type utmost point ear 1 forms third joining region 8 at second utmost point ear regional 6, first joining region 5 and second joining region 7 are located the both sides of through-hole 4, third joining region 8 and first joining region 5 homonymy, obtain the positive plate.
2) Preparation of negative plate
Coating graphite active slurry on two surfaces of the negative current collector, and welding a tab in an area which is not coated with the graphite active slurry to obtain a negative plate;
the graphite active slurry comprises the following components in percentage by mass: conductive carbon black: styrene-butadiene rubber: sodium carboxymethylcellulose (96%: 1.5%: 1.5%: 1 percent.
3) Preparation of lithium ion battery
Fig. 11 is a schematic structural view of a core in embodiment 1 of the present invention. Winding the positive electrode sheet of step 1), the negative electrode sheet of step 2), and the separator to obtain a winding core, as shown in fig. 11; and packaging, injecting liquid, forming, sealing for the second time, and grading to obtain the lithium ion battery.
Example 2
The lithium ion battery of the present embodiment is obtained by the following steps:
1) preparation of positive plate
The current collector of the positive electrode is Al-Al2O3-PET-Al2O3A current collector of Al structure, as shown in fig. 6 and 8, which includes a first tab region 3 and a first active layer region 2 in the width direction, three sides of the first tab region 3 being adjacent to the first active layer region 2; the second tab region 6 is arranged corresponding to the first tab region 3, the second active layer region 9 is arranged corresponding to the first active layer region 2, the first tab region 3 is provided with a through hole 4 penetrating to the second tab region 6, and the through hole 4 is oval;
applying a lithium cobaltate active paste to the first active layer region 2 and the second active layer region 9, wherein the mass composition of the lithium cobaltate active paste is lithium cobaltate: conductive carbon black: conductive carbon tubes: PVDF 97%: 1%: 0.5%: 1.5 percent;
the material is during T type utmost point ear 1 interlude into through-hole 4 of Al, the one end welding of the first section 1a of T type utmost point ear 1 forms first joining region 5 at first utmost point ear regional 3, the other end welding of the first section 1a of T type utmost point ear 1 forms second joining region 7 at first utmost point ear regional 3, the second section 1b welding of T type utmost point ear 1 forms third joining region 8 at second utmost point ear regional 6, first joining region 5 and second joining region 7 are located the both sides of through-hole 4, third joining region 8 and first joining region 5 homonymy, obtain the positive plate.
2) Preparation of negative plate
Coating graphite active slurry on two surfaces of the negative current collector, and welding a nickel tab on any surface of the negative current collector by ultrasonic welding in an area which is not coated with the graphite active slurry to obtain a negative plate;
the graphite active slurry comprises the following components in percentage by mass: conductive carbon black: styrene-butadiene rubber: sodium carboxymethylcellulose (96%: 1.5%: 1.5%: 1 percent.
3) Preparation of lithium ion battery
Fig. 12 is a schematic structural view of a winding core according to embodiment 2 of the present invention. As shown in fig. 12, the positive electrode sheet of step 1), the negative electrode sheet of step 2), and the separator were wound to obtain a roll core; and packaging, injecting liquid, forming, sealing for the second time, and grading to obtain the lithium ion battery.
Example 3
The lithium ion battery of the present embodiment is obtained by the following steps:
1) preparation of positive plate
The positive electrode current collector is a current collector with an Al-PP-Al structure, as shown in fig. 7 and 8, the positive electrode current collector includes a first tab area 3 and a first active layer area 2 in a width direction, and one side of the first tab area 3 is adjacent to the first active layer area 2; the second tab region 6 is arranged corresponding to the first tab region 3, the second active layer region 9 is arranged corresponding to the first active layer region 2, the first tab region 3 is provided with a through hole 4 penetrating to the second tab region 6, and the through hole 4 is oval;
applying a lithium cobaltate active paste to the first active layer region 2 and the second active layer region 9; wherein the lithium cobaltate active slurry comprises the following components in percentage by mass: conductive carbon black: conductive carbon tubes: PVDF 97%: 1%: 0.5%: 1.5 percent;
the material is during T type utmost point ear 1 interlude into through-hole 4 of Al, the one end welding of the first section 1a of T type utmost point ear 1 forms first joining region 5 at first utmost point ear regional 3, the other end welding of the first section 1a of T type utmost point ear 1 forms second joining region 7 at first utmost point ear regional 3, the second section 1b welding of T type utmost point ear 1 forms third joining region 8 at second utmost point ear regional 6, first joining region 5 and second joining region 7 are located the both sides of through-hole 4, third joining region 8 and first joining region 5 homonymy, obtain the positive plate.
2) Preparation of negative plate
Coating graphite active slurry on two surfaces of the negative current collector, and welding a tab in an area which is not coated with the graphite active slurry to obtain a negative plate;
the graphite active slurry comprises the following components in percentage by mass: conductive carbon black: styrene-butadiene rubber: sodium carboxymethylcellulose (96%: 1.5%: 1.5%: 1 percent.
3) Preparation of lithium ion battery
Fig. 13 is a schematic structural view of a winding core according to embodiment 3 of the present invention. Winding the positive electrode sheet of step 1), the negative electrode sheet of step 2), and the separator to obtain a winding core, as shown in fig. 13; and packaging, injecting liquid, forming, sealing for the second time, and grading to obtain the lithium ion battery.
Example 4
The lithium ion battery of the present embodiment is obtained by the following steps:
1) preparation of positive plate
Coating lithium cobaltate active slurry on two surfaces of the positive current collector, and welding an aluminum tab on any surface of the positive current collector by ultrasonic welding in an area not coated with the lithium cobaltate active slurry to obtain a positive plate;
the mass composition of the lithium cobaltate active slurry is as follows: conductive carbon black: conductive carbon tubes: PVDF 97%: 1%: 0.5%: 1.5 percent.
2) Preparation of negative plate
As shown in fig. 9 and 10, the negative current collector includes a first tab region 3 and a first active layer region 2 in a length direction, a second tab region 6 is arranged corresponding to the first tab region 3, a second active layer region 9 is arranged corresponding to the first active layer region 2, the first tab region 3 is provided with a through hole 4 penetrating to the second tab region 6, and the through hole 4 is elliptical;
coating graphite active slurry on the first active layer region 2 and the second active layer region 9, attaching protective adhesive paper on the first tab region 3 and the second tab region 6, and then forming holes in the protective adhesive paper at the through holes 4, wherein the holes are oval; the negative active slurry comprises the following components: conductive carbon black: styrene-butadiene rubber: sodium carboxymethylcellulose (96%: 1.5%: 1.5%: 1%, the thickness of the protective adhesive paper is 12 microns, and the ratio of the area of the open hole of the protective adhesive paper to the area of the through hole 4 is 1: 1;
the material is during T type utmost point ear 1 interlude into through-hole 4 of Ni, the one end welding of the first section 1a of T type utmost point ear 1 forms first joining region 5 at first utmost point ear regional 3, the other end welding of the first section 1a of T type utmost point ear 1 forms second joining region 7 at first utmost point ear regional 3, the second section 1b welding of T type utmost point ear 1 forms third joining region 8 at second utmost point ear regional 6, first joining region 5 and second joining region 7 are located the both sides of through-hole 4, third joining region 8 and first joining region 5 homonymy, obtain the negative pole piece.
3) Preparation of lithium ion battery
Winding the positive electrode sheet of step 1), the negative electrode sheet of step 2), and the separator to obtain a winding core, as shown in fig. 11; and packaging, injecting liquid, forming, sealing for the second time, and grading to obtain the lithium ion battery.
Example 5
The lithium ion battery of the present embodiment is obtained by the following steps:
1) preparation of positive plate
As shown in fig. 9 and 10, the positive electrode current collector includes a first tab region 3 and a first active layer region 2 in a length direction, a second tab region 6 is arranged corresponding to the first tab region 3, a second active layer region 9 is arranged corresponding to the first active layer region 2, the first tab region 3 is provided with a through hole 4 penetrating to the second tab region 6, and the through hole 4 is elliptical;
coating lithium cobaltate active slurry on the first active layer region 2 and the second active layer region 9, attaching protective gummed paper on the first tab region 3 and the second tab region 6, and then forming holes in the protective gummed paper at the through holes 4, wherein the holes are oval; wherein the lithium cobaltate active slurry comprises the following components: conductive carbon black: conductive carbon tubes: PVDF 97%: 1%: 0.5%: 1.5 percent, the thickness of the protective adhesive paper is 12 mu m, and the ratio of the area of the open pore of the protective adhesive paper to the area of the through hole 4 is 1: 1;
the material is during T type utmost point ear 1 interlude into through-hole 4 of Al, the one end welding of the first section 1a of T type utmost point ear 1 forms first joining region 5 at first utmost point ear regional 3, the other end welding of the first section 1a of T type utmost point ear 1 forms second joining region 7 at first utmost point ear regional 3, the second section 1b welding of T type utmost point ear 1 forms third joining region 8 at second utmost point ear regional 6, first joining region 5 and second joining region 7 are located the both sides of through-hole 4, third joining region 8 and first joining region 5 homonymy, obtain the positive plate.
2) Preparation of negative plate
As shown in fig. 9 and 10, the negative current collector includes a first tab region 3 and a first active layer region 2 in a length direction, a second tab region 6 is arranged corresponding to the first tab region 3, a second active layer region 9 is arranged corresponding to the first active layer region 2, the first tab region 3 is provided with a through hole 4 penetrating to the second tab region 6, and the through hole 4 is elliptical;
coating graphite active slurry on the first active layer region 2 and the second active layer region 9, attaching protective adhesive paper on the first tab region 3 and the second tab region 6, and then forming holes in the protective adhesive paper at the through holes 4, wherein the holes are oval; the negative active slurry comprises the following components: conductive carbon black: styrene-butadiene rubber: sodium carboxymethylcellulose (96%: 1.5%: 1.5%: 1%, the thickness of the protective adhesive paper is 12 microns, and the ratio of the area of the open hole of the protective adhesive paper to the area of the through hole 4 is 1: 1;
the material is during T type utmost point ear 1 interlude into through-hole 4 of Ni, the one end welding of the first section 1a of T type utmost point ear 1 forms first joining region 5 at first utmost point ear regional 3, the other end welding of the first section 1a of T type utmost point ear 1 forms second joining region 7 at first utmost point ear regional 3, the second section 1b welding of T type utmost point ear 1 forms third joining region 8 at second utmost point ear regional 6, first joining region 5 and second joining region 7 are located the both sides of through-hole 4, third joining region 8 and first joining region 5 homonymy, obtain the negative pole piece.
3) Preparation of lithium ion battery
Winding the positive electrode sheet of step 1), the negative electrode sheet of step 2), and the separator to obtain a winding core, as shown in fig. 11; and packaging, injecting liquid, forming, sealing for the second time, and grading to obtain the lithium ion battery.
Comparative example 1
The lithium ion battery of this comparative example was obtained by the following steps:
coating lithium cobaltate active slurry on two surfaces of the positive current collector, and welding a tab in an area which is not coated with the lithium cobaltate active slurry to obtain a positive plate;
coating graphite active slurry on two surfaces of the negative current collector, and welding a tab in an area which is not coated with the graphite active slurry to obtain a negative plate;
the mass composition of the lithium cobaltate active slurry is as follows: conductive carbon black: conductive carbon tubes: PVDF 97%: 1%: 0.5%: 1.5 percent, and the graphite active slurry comprises the following components in percentage by mass: conductive carbon black: styrene-butadiene rubber: sodium carboxymethylcellulose (96%: 1.5%: 1.5%: 1 percent;
winding the positive plate, the negative plate and the diaphragm to obtain a winding core; and packaging, injecting liquid, forming, sealing for the second time, and grading to obtain the lithium ion battery.
Comparative example 2
The lithium ion battery of this comparative example was obtained by the following steps:
coating the lithium cobaltate active slurry on two surfaces of the positive current collector by adopting a current collector with an Al-PET-Al structure as a positive current collector, and welding a tab on any surface of an area which is not coated with the lithium cobaltate active slurry to obtain a positive plate;
coating graphite active slurry on two surfaces of the negative current collector, and welding a tab in an area which is not coated with the graphite active slurry to obtain a negative plate;
the mass composition of the lithium cobaltate active slurry is as follows: conductive carbon black: conductive carbon tubes: PVDF 97%: 1%: 0.5%: 1.5 percent, and the graphite active slurry comprises the following components in percentage by mass: conductive carbon black: styrene-butadiene rubber: sodium carboxymethylcellulose (96%: 1.5%: 1.5%: 1 percent;
winding the positive plate, the negative plate and the diaphragm to obtain a winding core; and packaging, injecting liquid, forming, sealing for the second time, and grading to obtain the lithium ion battery.
Comparative example 3
The lithium ion battery of this comparative example was obtained by the following steps:
coating lithium cobaltate active slurry on two surfaces of the positive current collector, and welding a tab in an area which is not coated with the lithium cobaltate active slurry to obtain a positive plate;
coating graphite active slurry on two surfaces of the negative current collector, and welding a tab on any surface of an area which is not coated with the graphite active slurry to obtain a negative plate;
the mass composition of the lithium cobaltate active slurry is as follows: conductive carbon black: conductive carbon tubes: PVDF 97%: 1%: 0.5%: 1.5 percent, and the graphite active slurry comprises the following components in percentage by mass: conductive carbon black: styrene-butadiene rubber: sodium carboxymethylcellulose (96%: 1.5%: 1.5%: 1 percent;
winding the positive plate, the negative plate and the diaphragm to obtain a winding core; and packaging, injecting liquid, forming, sealing for the second time, and grading to obtain the lithium ion battery.
Performance testing
1) Weight impact test
The lithium ion battery is fully charged, the lithium ion battery is placed on a plane, a steel column with the diameter of 15.8 +/-0.2 mm is placed in the center of the lithium ion battery, the longitudinal axis of the steel column is parallel to the plane, a weight with the mass of 9.1 +/-0.1 kg freely falls onto the steel column above the lithium ion battery from the height of 610 +/-25 mm, 20 lithium ion batteries obtained in the same embodiment or comparative example are tested in parallel, and the weight impact passing rate of the lithium ion battery is calculated. The test results are shown in table 1.
2) Mass energy density
The lithium ion battery was charged to full charge at 0.2C and then discharged to 3.0V at 0.2C, the discharge energy E was recorded and the mass of the battery was measured using an electronic balance and recorded as m. The mass energy density ED of the battery is E/m.
3) Positive pole ear welding impedance
And connecting the positive electrode of the internal resistance instrument with the tab of the positive plate to obtain a first contact point, connecting the negative electrode of the internal resistance instrument with the non-tab part of the positive plate to obtain a second contact point, keeping the two contact points and the first connecting area on the same straight line, and fixing the edge distance between the first contact point and the first connecting area to be 20 mm.
4) Negative pole tab welding impedance
And connecting the negative electrode of the internal resistance instrument with the tab of the negative plate to obtain a first contact point, connecting the positive electrode of the internal resistance instrument with the non-tab part of the negative plate to obtain a second contact point, keeping the two contact points and the first connecting area on the same straight line, and fixing the edge distance between the first contact point and the first connecting area to be 20 mm.
TABLE 1 results of cell performance test of each example and comparative example
As can be seen from table 1, the mass energy density of the lithium ion batteries of examples 1 to 5 of the present invention is greater than that of the lithium ion batteries of the comparative example, the weight impact performance of the lithium ion batteries of examples 1 to 3 and 5 of the present invention is superior to that of the lithium ion batteries of the comparative example, the tab welding impedance of the positive electrode sheets of examples 1 to 3 and 5 of the present invention is lower than that of the positive electrode sheet of comparative example 2, and the tab welding impedance of the negative electrode sheets of examples 4 to 5 of the present invention is lower than that of the negative electrode sheet of comparative example 3. Therefore, the lithium ion battery provided by the embodiment of the invention not only has high mass energy density, but also has good safety performance, and the welding resistance of the tab can be reduced by using the technical scheme of the invention.
All the embodiments in the present specification are described in a related manner, and the same and similar parts among the embodiments may be referred to each other, and each embodiment focuses on the differences from the other embodiments.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall fall within the protection scope of the present invention.
Claims (10)
1. An electrode plate is characterized by comprising a current collector, an active layer and a T-shaped tab, wherein a first functional surface of the current collector comprises a first active layer region and a first tab region, a second functional surface of the current collector comprises a second active layer region opposite to the first active layer region and a second tab region opposite to the first tab region, and the active layer is arranged in the first active layer region and/or the second active layer region;
the first tab area is provided with N through holes penetrating to the second tab area, the T-shaped tab passes through the through holes, one end of a first section of the T-shaped tab is connected with the first tab area to form a first connection area, the other end of the first section of the T-shaped tab is connected with the first tab area to form a second connection area, a second section of the T-shaped tab is connected with the second tab area to form a third connection area, and N is more than or equal to 1;
the current collector comprises a first conducting layer, an insulating layer and a second conducting layer which are arranged in a stacked mode;
the first functional surface is a surface of the first conductive layer far away from the insulating layer, and the second functional surface is a surface of the second conductive layer far away from the insulating layer.
2. An electrode sheet as claimed in claim 1, wherein either one end of the first section or the second section extends beyond the current collector.
3. The electrode sheet according to claim 1 or 2, wherein in the first direction of the current collector, the minimum distance between the edges of the M through holes and the edge of the current collector is W1, and W1 is more than or equal to 1 mm; and/or the presence of a gas in the gas,
in the second direction of the current collector, the minimum distance between the edges of the M through holes and the edge of the first active layer area and/or the edge of the second active layer area is L1, L1 is more than or equal to 2mm, and M is less than or equal to N.
4. The electrode sheet according to claim 3, wherein, in the first direction of the current collector, a ratio of a minimum distance W1 between edges of the M through-holes and the edge of the current collector to a dimension W0 of the first tab region and/or the second tab region is (0.2-0.8): 1.
5. electrode sheet according to claim 3 or 4, characterized in that the ratio of the area of the through-hole to the cross-sectional area of the second section is (1.2-50): 1.
6. the electrode sheet according to any one of claims 2 to 5, wherein in the first direction of the current collector, the minimum distance between the edge of the connecting region and the edges of the M through holes is not less than 1 mm;
wherein the connection region comprises at least one of the first connection region, the second connection region, and the third connection region; and/or the presence of a gas in the gas,
in the first direction of the current collector, the minimum distance between the edge of the connecting area and the edge of the current collector is more than or equal to 1 mm;
wherein the connection region comprises at least one of the first connection region, the second connection region, and the third connection region.
7. The electrode sheet according to claim 6, wherein the first functional surface and/or the second functional surface is provided with a protective layer, the protective layer covers W through holes, the protective layer has openings at positions corresponding to the W through holes, and W is not less than N.
8. The electrode sheet according to claim 7, wherein the protective layer has a thickness of 0.5 to 50 μm.
9. The electrode sheet according to claim 8, wherein the area of the protective layer is 1.2 to 5 times the area of the M through holes.
10. An electrochemical device comprising the electrode sheet according to any one of claims 1 to 9.
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| CN114156488A (en) * | 2021-11-29 | 2022-03-08 | 珠海冠宇电池股份有限公司 | Pole piece, preparation method thereof and battery |
| CN114628858A (en) * | 2021-09-22 | 2022-06-14 | 万向一二三股份公司 | Pole lug structure of cylindrical lithium ion battery pole piece |
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